net/core/filter.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Linux Socket Filter - Kernel level socket filtering
   4  *
   5  * Based on the design of the Berkeley Packet Filter. The new
   6  * internal format has been designed by PLUMgrid:
   7  *
   8  *      Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com
   9  *
  10  * Authors:
  11  *
  12  *      Jay Schulist <jschlst@samba.org>
  13  *      Alexei Starovoitov <ast@plumgrid.com>
  14  *      Daniel Borkmann <dborkman@redhat.com>
  15  *
  16  * Andi Kleen - Fix a few bad bugs and races.
  17  * Kris Katterjohn - Added many additional checks in bpf_check_classic()
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/mm.h>
  23 #include <linux/fcntl.h>
  24 #include <linux/socket.h>
  25 #include <linux/sock_diag.h>
  26 #include <linux/in.h>
  27 #include <linux/inet.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/if_packet.h>
  30 #include <linux/if_arp.h>
  31 #include <linux/gfp.h>
  32 #include <net/inet_common.h>
  33 #include <net/ip.h>
  34 #include <net/protocol.h>
  35 #include <net/netlink.h>
  36 #include <linux/skbuff.h>
  37 #include <linux/skmsg.h>
  38 #include <net/sock.h>
  39 #include <net/flow_dissector.h>
  40 #include <linux/errno.h>
  41 #include <linux/timer.h>
  42 #include <linux/uaccess.h>
  43 #include <asm/unaligned.h>
  44 #include <asm/cmpxchg.h>
  45 #include <linux/filter.h>
  46 #include <linux/ratelimit.h>
  47 #include <linux/seccomp.h>
  48 #include <linux/if_vlan.h>
  49 #include <linux/bpf.h>
  50 #include <net/sch_generic.h>
  51 #include <net/cls_cgroup.h>
  52 #include <net/dst_metadata.h>
  53 #include <net/dst.h>
  54 #include <net/sock_reuseport.h>
  55 #include <net/busy_poll.h>
  56 #include <net/tcp.h>
  57 #include <net/xfrm.h>
  58 #include <net/udp.h>
  59 #include <linux/bpf_trace.h>
  60 #include <net/xdp_sock.h>
  61 #include <linux/inetdevice.h>
  62 #include <net/inet_hashtables.h>
  63 #include <net/inet6_hashtables.h>
  64 #include <net/ip_fib.h>
  65 #include <net/nexthop.h>
  66 #include <net/flow.h>
  67 #include <net/arp.h>
  68 #include <net/ipv6.h>
  69 #include <net/net_namespace.h>
  70 #include <linux/seg6_local.h>
  71 #include <net/seg6.h>
  72 #include <net/seg6_local.h>
  73 #include <net/lwtunnel.h>
  74 #include <net/ipv6_stubs.h>
  75 #include <net/bpf_sk_storage.h>
  76
  77 /**
  78  *      sk_filter_trim_cap - run a packet through a socket filter
  79  *      @sk: sock associated with &sk_buff
  80  *      @skb: buffer to filter
  81  *      @cap: limit on how short the eBPF program may trim the packet
  82  *
  83  * Run the eBPF program and then cut skb->data to correct size returned by
  84  * the program. If pkt_len is 0 we toss packet. If skb->len is smaller
  85  * than pkt_len we keep whole skb->data. This is the socket level
  86  * wrapper to BPF_PROG_RUN. It returns 0 if the packet should
  87  * be accepted or -EPERM if the packet should be tossed.
  88  *
  89  */
  90 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap)
  91 {
  92         int err;
  93         struct sk_filter *filter;
  94
  95         /*
  96          * If the skb was allocated from pfmemalloc reserves, only
  97          * allow SOCK_MEMALLOC sockets to use it as this socket is
  98          * helping free memory
  99          */
 100         if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) {
 101                 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP);
 102                 return -ENOMEM;
 103         }
 104         err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb);
 105         if (err)
 106                 return err;
 107
 108         err = security_sock_rcv_skb(sk, skb);
 109         if (err)
 110                 return err;
 111
 112         rcu_read_lock();
 113         filter = rcu_dereference(sk->sk_filter);
 114         if (filter) {
 115                 struct sock *save_sk = skb->sk;
 116                 unsigned int pkt_len;
 117
 118                 skb->sk = sk;
 119                 pkt_len = bpf_prog_run_save_cb(filter->prog, skb);
 120                 skb->sk = save_sk;
 121                 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM;
 122         }
 123         rcu_read_unlock();
 124
 125         return err;
 126 }
 127 EXPORT_SYMBOL(sk_filter_trim_cap);
 128
 129 BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb)
 130 {
 131         return skb_get_poff(skb);
 132 }
 133
 134 BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x)
 135 {
 136         struct nlattr *nla;
 137
 138         if (skb_is_nonlinear(skb))
 139                 return 0;
 140
 141         if (skb->len < sizeof(struct nlattr))
 142                 return 0;
 143
 144         if (a > skb->len - sizeof(struct nlattr))
 145                 return 0;
 146
 147         nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x);
 148         if (nla)
 149                 return (void *) nla - (void *) skb->data;
 150
 151         return 0;
 152 }
 153
 154 BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x)
 155 {
 156         struct nlattr *nla;
 157
 158         if (skb_is_nonlinear(skb))
 159                 return 0;
 160
 161         if (skb->len < sizeof(struct nlattr))
 162                 return 0;
 163
 164         if (a > skb->len - sizeof(struct nlattr))
 165                 return 0;
 166
 167         nla = (struct nlattr *) &skb->data[a];
 168         if (nla->nla_len > skb->len - a)
 169                 return 0;
 170
 171         nla = nla_find_nested(nla, x);
 172         if (nla)
 173                 return (void *) nla - (void *) skb->data;
 174
 175         return 0;
 176 }
 177
 178 BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *,
 179            data, int, headlen, int, offset)
 180 {
 181         u8 tmp, *ptr;
 182         const int len = sizeof(tmp);
 183
 184         if (offset >= 0) {
 185                 if (headlen - offset >= len)
 186                         return *(u8 *)(data + offset);
 187                 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
 188                         return tmp;
 189         } else {
 190                 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
 191                 if (likely(ptr))
 192                         return *(u8 *)ptr;
 193         }
 194
 195         return -EFAULT;
 196 }
 197
 198 BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb,
 199            int, offset)
 200 {
 201         return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len,
 202                                          offset);
 203 }
 204
 205 BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *,
 206            data, int, headlen, int, offset)
 207 {
 208         u16 tmp, *ptr;
 209         const int len = sizeof(tmp);
 210
 211         if (offset >= 0) {
 212                 if (headlen - offset >= len)
 213                         return get_unaligned_be16(data + offset);
 214                 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
 215                         return be16_to_cpu(tmp);
 216         } else {
 217                 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
 218                 if (likely(ptr))
 219                         return get_unaligned_be16(ptr);
 220         }
 221
 222         return -EFAULT;
 223 }
 224
 225 BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb,
 226            int, offset)
 227 {
 228         return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len,
 229                                           offset);
 230 }
 231
 232 BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *,
 233            data, int, headlen, int, offset)
 234 {
 235         u32 tmp, *ptr;
 236         const int len = sizeof(tmp);
 237
 238         if (likely(offset >= 0)) {
 239                 if (headlen - offset >= len)
 240                         return get_unaligned_be32(data + offset);
 241                 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
 242                         return be32_to_cpu(tmp);
 243         } else {
 244                 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
 245                 if (likely(ptr))
 246                         return get_unaligned_be32(ptr);
 247         }
 248
 249         return -EFAULT;
 250 }
 251
 252 BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb,
 253            int, offset)
 254 {
 255         return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len,
 256                                           offset);
 257 }
 258
 259 BPF_CALL_0(bpf_get_raw_cpu_id)
 260 {
 261         return raw_smp_processor_id();
 262 }
 263
 264 static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = {
 265         .func           = bpf_get_raw_cpu_id,
 266         .gpl_only       = false,
 267         .ret_type       = RET_INTEGER,
 268 };
 269
 270 static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg,
 271                               struct bpf_insn *insn_buf)
 272 {
 273         struct bpf_insn *insn = insn_buf;
 274
 275         switch (skb_field) {
 276         case SKF_AD_MARK:
 277                 BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4);
 278
 279                 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg,
 280                                       offsetof(struct sk_buff, mark));
 281                 break;
 282
 283         case SKF_AD_PKTTYPE:
 284                 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET());
 285                 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX);
 286 #ifdef __BIG_ENDIAN_BITFIELD
 287                 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5);
 288 #endif
 289                 break;
 290
 291         case SKF_AD_QUEUE:
 292                 BUILD_BUG_ON(sizeof_field(struct sk_buff, queue_mapping) != 2);
 293
 294                 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
 295                                       offsetof(struct sk_buff, queue_mapping));
 296                 break;
 297
 298         case SKF_AD_VLAN_TAG:
 299                 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_tci) != 2);
 300
 301                 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */
 302                 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
 303                                       offsetof(struct sk_buff, vlan_tci));
 304                 break;
 305         case SKF_AD_VLAN_TAG_PRESENT:
 306                 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_VLAN_PRESENT_OFFSET());
 307                 if (PKT_VLAN_PRESENT_BIT)
 308                         *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, PKT_VLAN_PRESENT_BIT);
 309                 if (PKT_VLAN_PRESENT_BIT < 7)
 310                         *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1);
 311                 break;
 312         }
 313
 314         return insn - insn_buf;
 315 }
 316
 317 static bool convert_bpf_extensions(struct sock_filter *fp,
 318                                    struct bpf_insn **insnp)
 319 {
 320         struct bpf_insn *insn = *insnp;
 321         u32 cnt;
 322
 323         switch (fp->k) {
 324         case SKF_AD_OFF + SKF_AD_PROTOCOL:
 325                 BUILD_BUG_ON(sizeof_field(struct sk_buff, protocol) != 2);
 326
 327                 /* A = *(u16 *) (CTX + offsetof(protocol)) */
 328                 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
 329                                       offsetof(struct sk_buff, protocol));
 330                 /* A = ntohs(A) [emitting a nop or swap16] */
 331                 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
 332                 break;
 333
 334         case SKF_AD_OFF + SKF_AD_PKTTYPE:
 335                 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn);
 336                 insn += cnt - 1;
 337                 break;
 338
 339         case SKF_AD_OFF + SKF_AD_IFINDEX:
 340         case SKF_AD_OFF + SKF_AD_HATYPE:
 341                 BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4);
 342                 BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2);
 343
 344                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
 345                                       BPF_REG_TMP, BPF_REG_CTX,
 346                                       offsetof(struct sk_buff, dev));
 347                 /* if (tmp != 0) goto pc + 1 */
 348                 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1);
 349                 *insn++ = BPF_EXIT_INSN();
 350                 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX)
 351                         *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP,
 352                                             offsetof(struct net_device, ifindex));
 353                 else
 354                         *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP,
 355                                             offsetof(struct net_device, type));
 356                 break;
 357
 358         case SKF_AD_OFF + SKF_AD_MARK:
 359                 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn);
 360                 insn += cnt - 1;
 361                 break;
 362
 363         case SKF_AD_OFF + SKF_AD_RXHASH:
 364                 BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4);
 365
 366                 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX,
 367                                     offsetof(struct sk_buff, hash));
 368                 break;
 369
 370         case SKF_AD_OFF + SKF_AD_QUEUE:
 371                 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn);
 372                 insn += cnt - 1;
 373                 break;
 374
 375         case SKF_AD_OFF + SKF_AD_VLAN_TAG:
 376                 cnt = convert_skb_access(SKF_AD_VLAN_TAG,
 377                                          BPF_REG_A, BPF_REG_CTX, insn);
 378                 insn += cnt - 1;
 379                 break;
 380
 381         case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT:
 382                 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT,
 383                                          BPF_REG_A, BPF_REG_CTX, insn);
 384                 insn += cnt - 1;
 385                 break;
 386
 387         case SKF_AD_OFF + SKF_AD_VLAN_TPID:
 388                 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_proto) != 2);
 389
 390                 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */
 391                 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
 392                                       offsetof(struct sk_buff, vlan_proto));
 393                 /* A = ntohs(A) [emitting a nop or swap16] */
 394                 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
 395                 break;
 396
 397         case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
 398         case SKF_AD_OFF + SKF_AD_NLATTR:
 399         case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
 400         case SKF_AD_OFF + SKF_AD_CPU:
 401         case SKF_AD_OFF + SKF_AD_RANDOM:
 402                 /* arg1 = CTX */
 403                 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
 404                 /* arg2 = A */
 405                 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A);
 406                 /* arg3 = X */
 407                 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X);
 408                 /* Emit call(arg1=CTX, arg2=A, arg3=X) */
 409                 switch (fp->k) {
 410                 case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
 411                         *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset);
 412                         break;
 413                 case SKF_AD_OFF + SKF_AD_NLATTR:
 414                         *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr);
 415                         break;
 416                 case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
 417                         *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest);
 418                         break;
 419                 case SKF_AD_OFF + SKF_AD_CPU:
 420                         *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id);
 421                         break;
 422                 case SKF_AD_OFF + SKF_AD_RANDOM:
 423                         *insn = BPF_EMIT_CALL(bpf_user_rnd_u32);
 424                         bpf_user_rnd_init_once();
 425                         break;
 426                 }
 427                 break;
 428
 429         case SKF_AD_OFF + SKF_AD_ALU_XOR_X:
 430                 /* A ^= X */
 431                 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X);
 432                 break;
 433
 434         default:
 435                 /* This is just a dummy call to avoid letting the compiler
 436                  * evict __bpf_call_base() as an optimization. Placed here
 437                  * where no-one bothers.
 438                  */
 439                 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0);
 440                 return false;
 441         }
 442
 443         *insnp = insn;
 444         return true;
 445 }
 446
 447 static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp)
 448 {
 449         const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS);
 450         int size = bpf_size_to_bytes(BPF_SIZE(fp->code));
 451         bool endian = BPF_SIZE(fp->code) == BPF_H ||
 452                       BPF_SIZE(fp->code) == BPF_W;
 453         bool indirect = BPF_MODE(fp->code) == BPF_IND;
 454         const int ip_align = NET_IP_ALIGN;
 455         struct bpf_insn *insn = *insnp;
 456         int offset = fp->k;
 457
 458         if (!indirect &&
 459             ((unaligned_ok && offset >= 0) ||
 460              (!unaligned_ok && offset >= 0 &&
 461               offset + ip_align >= 0 &&
 462               offset + ip_align % size == 0))) {
 463                 bool ldx_off_ok = offset <= S16_MAX;
 464
 465                 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H);
 466                 if (offset)
 467                         *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset);
 468                 *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP,
 469                                       size, 2 + endian + (!ldx_off_ok * 2));
 470                 if (ldx_off_ok) {
 471                         *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A,
 472                                               BPF_REG_D, offset);
 473                 } else {
 474                         *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D);
 475                         *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset);
 476                         *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A,
 477                                               BPF_REG_TMP, 0);
 478                 }
 479                 if (endian)
 480                         *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8);
 481                 *insn++ = BPF_JMP_A(8);
 482         }
 483
 484         *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
 485         *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D);
 486         *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H);
 487         if (!indirect) {
 488                 *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset);
 489         } else {
 490                 *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X);
 491                 if (fp->k)
 492                         *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset);
 493         }
 494
 495         switch (BPF_SIZE(fp->code)) {
 496         case BPF_B:
 497                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8);
 498                 break;
 499         case BPF_H:
 500                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16);
 501                 break;
 502         case BPF_W:
 503                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32);
 504                 break;
 505         default:
 506                 return false;
 507         }
 508
 509         *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2);
 510         *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
 511         *insn   = BPF_EXIT_INSN();
 512
 513         *insnp = insn;
 514         return true;
 515 }
 516
 517 /**
 518  *      bpf_convert_filter - convert filter program
 519  *      @prog: the user passed filter program
 520  *      @len: the length of the user passed filter program
 521  *      @new_prog: allocated 'struct bpf_prog' or NULL
 522  *      @new_len: pointer to store length of converted program
 523  *      @seen_ld_abs: bool whether we've seen ld_abs/ind
 524  *
 525  * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn'
 526  * style extended BPF (eBPF).
 527  * Conversion workflow:
 528  *
 529  * 1) First pass for calculating the new program length:
 530  *   bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs)
 531  *
 532  * 2) 2nd pass to remap in two passes: 1st pass finds new
 533  *    jump offsets, 2nd pass remapping:
 534  *   bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs)
 535  */
 536 static int bpf_convert_filter(struct sock_filter *prog, int len,
 537                               struct bpf_prog *new_prog, int *new_len,
 538                               bool *seen_ld_abs)
 539 {
 540         int new_flen = 0, pass = 0, target, i, stack_off;
 541         struct bpf_insn *new_insn, *first_insn = NULL;
 542         struct sock_filter *fp;
 543         int *addrs = NULL;
 544         u8 bpf_src;
 545
 546         BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK);
 547         BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG);
 548
 549         if (len <= 0 || len > BPF_MAXINSNS)
 550                 return -EINVAL;
 551
 552         if (new_prog) {
 553                 first_insn = new_prog->insnsi;
 554                 addrs = kcalloc(len, sizeof(*addrs),
 555                                 GFP_KERNEL | __GFP_NOWARN);
 556                 if (!addrs)
 557                         return -ENOMEM;
 558         }
 559
 560 do_pass:
 561         new_insn = first_insn;
 562         fp = prog;
 563
 564         /* Classic BPF related prologue emission. */
 565         if (new_prog) {
 566                 /* Classic BPF expects A and X to be reset first. These need
 567                  * to be guaranteed to be the first two instructions.
 568                  */
 569                 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
 570                 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X);
 571
 572                 /* All programs must keep CTX in callee saved BPF_REG_CTX.
 573                  * In eBPF case it's done by the compiler, here we need to
 574                  * do this ourself. Initial CTX is present in BPF_REG_ARG1.
 575                  */
 576                 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1);
 577                 if (*seen_ld_abs) {
 578                         /* For packet access in classic BPF, cache skb->data
 579                          * in callee-saved BPF R8 and skb->len - skb->data_len
 580                          * (headlen) in BPF R9. Since classic BPF is read-only
 581                          * on CTX, we only need to cache it once.
 582                          */
 583                         *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
 584                                                   BPF_REG_D, BPF_REG_CTX,
 585                                                   offsetof(struct sk_buff, data));
 586                         *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX,
 587                                                   offsetof(struct sk_buff, len));
 588                         *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX,
 589                                                   offsetof(struct sk_buff, data_len));
 590                         *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP);
 591                 }
 592         } else {
 593                 new_insn += 3;
 594         }
 595
 596         for (i = 0; i < len; fp++, i++) {
 597                 struct bpf_insn tmp_insns[32] = { };
 598                 struct bpf_insn *insn = tmp_insns;
 599
 600                 if (addrs)
 601                         addrs[i] = new_insn - first_insn;
 602
 603                 switch (fp->code) {
 604                 /* All arithmetic insns and skb loads map as-is. */
 605                 case BPF_ALU | BPF_ADD | BPF_X:
 606                 case BPF_ALU | BPF_ADD | BPF_K:
 607                 case BPF_ALU | BPF_SUB | BPF_X:
 608                 case BPF_ALU | BPF_SUB | BPF_K:
 609                 case BPF_ALU | BPF_AND | BPF_X:
 610                 case BPF_ALU | BPF_AND | BPF_K:
 611                 case BPF_ALU | BPF_OR | BPF_X:
 612                 case BPF_ALU | BPF_OR | BPF_K:
 613                 case BPF_ALU | BPF_LSH | BPF_X:
 614                 case BPF_ALU | BPF_LSH | BPF_K:
 615                 case BPF_ALU | BPF_RSH | BPF_X:
 616                 case BPF_ALU | BPF_RSH | BPF_K:
 617                 case BPF_ALU | BPF_XOR | BPF_X:
 618                 case BPF_ALU | BPF_XOR | BPF_K:
 619                 case BPF_ALU | BPF_MUL | BPF_X:
 620                 case BPF_ALU | BPF_MUL | BPF_K:
 621                 case BPF_ALU | BPF_DIV | BPF_X:
 622                 case BPF_ALU | BPF_DIV | BPF_K:
 623                 case BPF_ALU | BPF_MOD | BPF_X:
 624                 case BPF_ALU | BPF_MOD | BPF_K:
 625                 case BPF_ALU | BPF_NEG:
 626                 case BPF_LD | BPF_ABS | BPF_W:
 627                 case BPF_LD | BPF_ABS | BPF_H:
 628                 case BPF_LD | BPF_ABS | BPF_B:
 629                 case BPF_LD | BPF_IND | BPF_W:
 630                 case BPF_LD | BPF_IND | BPF_H:
 631                 case BPF_LD | BPF_IND | BPF_B:
 632                         /* Check for overloaded BPF extension and
 633                          * directly convert it if found, otherwise
 634                          * just move on with mapping.
 635                          */
 636                         if (BPF_CLASS(fp->code) == BPF_LD &&
 637                             BPF_MODE(fp->code) == BPF_ABS &&
 638                             convert_bpf_extensions(fp, &insn))
 639                                 break;
 640                         if (BPF_CLASS(fp->code) == BPF_LD &&
 641                             convert_bpf_ld_abs(fp, &insn)) {
 642                                 *seen_ld_abs = true;
 643                                 break;
 644                         }
 645
 646                         if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) ||
 647                             fp->code == (BPF_ALU | BPF_MOD | BPF_X)) {
 648                                 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X);
 649                                 /* Error with exception code on div/mod by 0.
 650                                  * For cBPF programs, this was always return 0.
 651                                  */
 652                                 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2);
 653                                 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
 654                                 *insn++ = BPF_EXIT_INSN();
 655                         }
 656
 657                         *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k);
 658                         break;
 659
 660                 /* Jump transformation cannot use BPF block macros
 661                  * everywhere as offset calculation and target updates
 662                  * require a bit more work than the rest, i.e. jump
 663                  * opcodes map as-is, but offsets need adjustment.
 664                  */
 665
 666 #define BPF_EMIT_JMP                                                    \
 667         do {                                                            \
 668                 const s32 off_min = S16_MIN, off_max = S16_MAX;         \
 669                 s32 off;                                                \
 670                                                                         \
 671                 if (target >= len || target < 0)                        \
 672                         goto err;                                       \
 673                 off = addrs ? addrs[target] - addrs[i] - 1 : 0;         \
 674                 /* Adjust pc relative offset for 2nd or 3rd insn. */    \
 675                 off -= insn - tmp_insns;                                \
 676                 /* Reject anything not fitting into insn->off. */       \
 677                 if (off < off_min || off > off_max)                     \
 678                         goto err;                                       \
 679                 insn->off = off;                                        \
 680         } while (0)
 681
 682                 case BPF_JMP | BPF_JA:
 683                         target = i + fp->k + 1;
 684                         insn->code = fp->code;
 685                         BPF_EMIT_JMP;
 686                         break;
 687
 688                 case BPF_JMP | BPF_JEQ | BPF_K:
 689                 case BPF_JMP | BPF_JEQ | BPF_X:
 690                 case BPF_JMP | BPF_JSET | BPF_K:
 691                 case BPF_JMP | BPF_JSET | BPF_X:
 692                 case BPF_JMP | BPF_JGT | BPF_K:
 693                 case BPF_JMP | BPF_JGT | BPF_X:
 694                 case BPF_JMP | BPF_JGE | BPF_K:
 695                 case BPF_JMP | BPF_JGE | BPF_X:
 696                         if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) {
 697                                 /* BPF immediates are signed, zero extend
 698                                  * immediate into tmp register and use it
 699                                  * in compare insn.
 700                                  */
 701                                 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k);
 702
 703                                 insn->dst_reg = BPF_REG_A;
 704                                 insn->src_reg = BPF_REG_TMP;
 705                                 bpf_src = BPF_X;
 706                         } else {
 707                                 insn->dst_reg = BPF_REG_A;
 708                                 insn->imm = fp->k;
 709                                 bpf_src = BPF_SRC(fp->code);
 710                                 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0;
 711                         }
 712
 713                         /* Common case where 'jump_false' is next insn. */
 714                         if (fp->jf == 0) {
 715                                 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
 716                                 target = i + fp->jt + 1;
 717                                 BPF_EMIT_JMP;
 718                                 break;
 719                         }
 720
 721                         /* Convert some jumps when 'jump_true' is next insn. */
 722                         if (fp->jt == 0) {
 723                                 switch (BPF_OP(fp->code)) {
 724                                 case BPF_JEQ:
 725                                         insn->code = BPF_JMP | BPF_JNE | bpf_src;
 726                                         break;
 727                                 case BPF_JGT:
 728                                         insn->code = BPF_JMP | BPF_JLE | bpf_src;
 729                                         break;
 730                                 case BPF_JGE:
 731                                         insn->code = BPF_JMP | BPF_JLT | bpf_src;
 732                                         break;
 733                                 default:
 734                                         goto jmp_rest;
 735                                 }
 736
 737                                 target = i + fp->jf + 1;
 738                                 BPF_EMIT_JMP;
 739                                 break;
 740                         }
 741 jmp_rest:
 742                         /* Other jumps are mapped into two insns: Jxx and JA. */
 743                         target = i + fp->jt + 1;
 744                         insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
 745                         BPF_EMIT_JMP;
 746                         insn++;
 747
 748                         insn->code = BPF_JMP | BPF_JA;
 749                         target = i + fp->jf + 1;
 750                         BPF_EMIT_JMP;
 751                         break;
 752
 753                 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */
 754                 case BPF_LDX | BPF_MSH | BPF_B: {
 755                         struct sock_filter tmp = {
 756                                 .code   = BPF_LD | BPF_ABS | BPF_B,
 757                                 .k      = fp->k,
 758                         };
 759
 760                         *seen_ld_abs = true;
 761
 762                         /* X = A */
 763                         *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
 764                         /* A = BPF_R0 = *(u8 *) (skb->data + K) */
 765                         convert_bpf_ld_abs(&tmp, &insn);
 766                         insn++;
 767                         /* A &= 0xf */
 768                         *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf);
 769                         /* A <<= 2 */
 770                         *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2);
 771                         /* tmp = X */
 772                         *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X);
 773                         /* X = A */
 774                         *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
 775                         /* A = tmp */
 776                         *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP);
 777                         break;
 778                 }
 779                 /* RET_K is remaped into 2 insns. RET_A case doesn't need an
 780                  * extra mov as BPF_REG_0 is already mapped into BPF_REG_A.
 781                  */
 782                 case BPF_RET | BPF_A:
 783                 case BPF_RET | BPF_K:
 784                         if (BPF_RVAL(fp->code) == BPF_K)
 785                                 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0,
 786                                                         0, fp->k);
 787                         *insn = BPF_EXIT_INSN();
 788                         break;
 789
 790                 /* Store to stack. */
 791                 case BPF_ST:
 792                 case BPF_STX:
 793                         stack_off = fp->k * 4  + 4;
 794                         *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) ==
 795                                             BPF_ST ? BPF_REG_A : BPF_REG_X,
 796                                             -stack_off);
 797                         /* check_load_and_stores() verifies that classic BPF can
 798                          * load from stack only after write, so tracking
 799                          * stack_depth for ST|STX insns is enough
 800                          */
 801                         if (new_prog && new_prog->aux->stack_depth < stack_off)
 802                                 new_prog->aux->stack_depth = stack_off;
 803                         break;
 804
 805                 /* Load from stack. */
 806                 case BPF_LD | BPF_MEM:
 807                 case BPF_LDX | BPF_MEM:
 808                         stack_off = fp->k * 4  + 4;
 809                         *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD  ?
 810                                             BPF_REG_A : BPF_REG_X, BPF_REG_FP,
 811                                             -stack_off);
 812                         break;
 813
 814                 /* A = K or X = K */
 815                 case BPF_LD | BPF_IMM:
 816                 case BPF_LDX | BPF_IMM:
 817                         *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ?
 818                                               BPF_REG_A : BPF_REG_X, fp->k);
 819                         break;
 820
 821                 /* X = A */
 822                 case BPF_MISC | BPF_TAX:
 823                         *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
 824                         break;
 825
 826                 /* A = X */
 827                 case BPF_MISC | BPF_TXA:
 828                         *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X);
 829                         break;
 830
 831                 /* A = skb->len or X = skb->len */
 832                 case BPF_LD | BPF_W | BPF_LEN:
 833                 case BPF_LDX | BPF_W | BPF_LEN:
 834                         *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
 835                                             BPF_REG_A : BPF_REG_X, BPF_REG_CTX,
 836                                             offsetof(struct sk_buff, len));
 837                         break;
 838
 839                 /* Access seccomp_data fields. */
 840                 case BPF_LDX | BPF_ABS | BPF_W:
 841                         /* A = *(u32 *) (ctx + K) */
 842                         *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k);
 843                         break;
 844
 845                 /* Unknown instruction. */
 846                 default:
 847                         goto err;
 848                 }
 849
 850                 insn++;
 851                 if (new_prog)
 852                         memcpy(new_insn, tmp_insns,
 853                                sizeof(*insn) * (insn - tmp_insns));
 854                 new_insn += insn - tmp_insns;
 855         }
 856
 857         if (!new_prog) {
 858                 /* Only calculating new length. */
 859                 *new_len = new_insn - first_insn;
 860                 if (*seen_ld_abs)
 861                         *new_len += 4; /* Prologue bits. */
 862                 return 0;
 863         }
 864
 865         pass++;
 866         if (new_flen != new_insn - first_insn) {
 867                 new_flen = new_insn - first_insn;
 868                 if (pass > 2)
 869                         goto err;
 870                 goto do_pass;
 871         }
 872
 873         kfree(addrs);
 874         BUG_ON(*new_len != new_flen);
 875         return 0;
 876 err:
 877         kfree(addrs);
 878         return -EINVAL;
 879 }
 880
 881 /* Security:
 882  *
 883  * As we dont want to clear mem[] array for each packet going through
 884  * __bpf_prog_run(), we check that filter loaded by user never try to read
 885  * a cell if not previously written, and we check all branches to be sure
 886  * a malicious user doesn't try to abuse us.
 887  */
 888 static int check_load_and_stores(const struct sock_filter *filter, int flen)
 889 {
 890         u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */
 891         int pc, ret = 0;
 892
 893         BUILD_BUG_ON(BPF_MEMWORDS > 16);
 894
 895         masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL);
 896         if (!masks)
 897                 return -ENOMEM;
 898
 899         memset(masks, 0xff, flen * sizeof(*masks));
 900
 901         for (pc = 0; pc < flen; pc++) {
 902                 memvalid &= masks[pc];
 903
 904                 switch (filter[pc].code) {
 905                 case BPF_ST:
 906                 case BPF_STX:
 907                         memvalid |= (1 << filter[pc].k);
 908                         break;
 909                 case BPF_LD | BPF_MEM:
 910                 case BPF_LDX | BPF_MEM:
 911                         if (!(memvalid & (1 << filter[pc].k))) {
 912                                 ret = -EINVAL;
 913                                 goto error;
 914                         }
 915                         break;
 916                 case BPF_JMP | BPF_JA:
 917                         /* A jump must set masks on target */
 918                         masks[pc + 1 + filter[pc].k] &= memvalid;
 919                         memvalid = ~0;
 920                         break;
 921                 case BPF_JMP | BPF_JEQ | BPF_K:
 922                 case BPF_JMP | BPF_JEQ | BPF_X:
 923                 case BPF_JMP | BPF_JGE | BPF_K:
 924                 case BPF_JMP | BPF_JGE | BPF_X:
 925                 case BPF_JMP | BPF_JGT | BPF_K:
 926                 case BPF_JMP | BPF_JGT | BPF_X:
 927                 case BPF_JMP | BPF_JSET | BPF_K:
 928                 case BPF_JMP | BPF_JSET | BPF_X:
 929                         /* A jump must set masks on targets */
 930                         masks[pc + 1 + filter[pc].jt] &= memvalid;
 931                         masks[pc + 1 + filter[pc].jf] &= memvalid;
 932                         memvalid = ~0;
 933                         break;
 934                 }
 935         }
 936 error:
 937         kfree(masks);
 938         return ret;
 939 }
 940
 941 static bool chk_code_allowed(u16 code_to_probe)
 942 {
 943         static const bool codes[] = {
 944                 /* 32 bit ALU operations */
 945                 [BPF_ALU | BPF_ADD | BPF_K] = true,
 946                 [BPF_ALU | BPF_ADD | BPF_X] = true,
 947                 [BPF_ALU | BPF_SUB | BPF_K] = true,
 948                 [BPF_ALU | BPF_SUB | BPF_X] = true,
 949                 [BPF_ALU | BPF_MUL | BPF_K] = true,
 950                 [BPF_ALU | BPF_MUL | BPF_X] = true,
 951                 [BPF_ALU | BPF_DIV | BPF_K] = true,
 952                 [BPF_ALU | BPF_DIV | BPF_X] = true,
 953                 [BPF_ALU | BPF_MOD | BPF_K] = true,
 954                 [BPF_ALU | BPF_MOD | BPF_X] = true,
 955                 [BPF_ALU | BPF_AND | BPF_K] = true,
 956                 [BPF_ALU | BPF_AND | BPF_X] = true,
 957                 [BPF_ALU | BPF_OR | BPF_K] = true,
 958                 [BPF_ALU | BPF_OR | BPF_X] = true,
 959                 [BPF_ALU | BPF_XOR | BPF_K] = true,
 960                 [BPF_ALU | BPF_XOR | BPF_X] = true,
 961                 [BPF_ALU | BPF_LSH | BPF_K] = true,
 962                 [BPF_ALU | BPF_LSH | BPF_X] = true,
 963                 [BPF_ALU | BPF_RSH | BPF_K] = true,
 964                 [BPF_ALU | BPF_RSH | BPF_X] = true,
 965                 [BPF_ALU | BPF_NEG] = true,
 966                 /* Load instructions */
 967                 [BPF_LD | BPF_W | BPF_ABS] = true,
 968                 [BPF_LD | BPF_H | BPF_ABS] = true,
 969                 [BPF_LD | BPF_B | BPF_ABS] = true,
 970                 [BPF_LD | BPF_W | BPF_LEN] = true,
 971                 [BPF_LD | BPF_W | BPF_IND] = true,
 972                 [BPF_LD | BPF_H | BPF_IND] = true,
 973                 [BPF_LD | BPF_B | BPF_IND] = true,
 974                 [BPF_LD | BPF_IMM] = true,
 975                 [BPF_LD | BPF_MEM] = true,
 976                 [BPF_LDX | BPF_W | BPF_LEN] = true,
 977                 [BPF_LDX | BPF_B | BPF_MSH] = true,
 978                 [BPF_LDX | BPF_IMM] = true,
 979                 [BPF_LDX | BPF_MEM] = true,
 980                 /* Store instructions */
 981                 [BPF_ST] = true,
 982                 [BPF_STX] = true,
 983                 /* Misc instructions */
 984                 [BPF_MISC | BPF_TAX] = true,
 985                 [BPF_MISC | BPF_TXA] = true,
 986                 /* Return instructions */
 987                 [BPF_RET | BPF_K] = true,
 988                 [BPF_RET | BPF_A] = true,
 989                 /* Jump instructions */
 990                 [BPF_JMP | BPF_JA] = true,
 991                 [BPF_JMP | BPF_JEQ | BPF_K] = true,
 992                 [BPF_JMP | BPF_JEQ | BPF_X] = true,
 993                 [BPF_JMP | BPF_JGE | BPF_K] = true,
 994                 [BPF_JMP | BPF_JGE | BPF_X] = true,
 995                 [BPF_JMP | BPF_JGT | BPF_K] = true,
 996                 [BPF_JMP | BPF_JGT | BPF_X] = true,
 997                 [BPF_JMP | BPF_JSET | BPF_K] = true,
 998                 [BPF_JMP | BPF_JSET | BPF_X] = true,
 999         };
1000
1001         if (code_to_probe >= ARRAY_SIZE(codes))
1002                 return false;
1003
1004         return codes[code_to_probe];
1005 }
1006
1007 static bool bpf_check_basics_ok(const struct sock_filter *filter,
1008                                 unsigned int flen)
1009 {
1010         if (filter == NULL)
1011                 return false;
1012         if (flen == 0 || flen > BPF_MAXINSNS)
1013                 return false;
1014
1015         return true;
1016 }
1017
1018 /**
1019  *      bpf_check_classic - verify socket filter code
1020  *      @filter: filter to verify
1021  *      @flen: length of filter
1022  *
1023  * Check the user's filter code. If we let some ugly
1024  * filter code slip through kaboom! The filter must contain
1025  * no references or jumps that are out of range, no illegal
1026  * instructions, and must end with a RET instruction.
1027  *
1028  * All jumps are forward as they are not signed.
1029  *
1030  * Returns 0 if the rule set is legal or -EINVAL if not.
1031  */
1032 static int bpf_check_classic(const struct sock_filter *filter,
1033                              unsigned int flen)
1034 {
1035         bool anc_found;
1036         int pc;
1037
1038         /* Check the filter code now */
1039         for (pc = 0; pc < flen; pc++) {
1040                 const struct sock_filter *ftest = &filter[pc];
1041
1042                 /* May we actually operate on this code? */
1043                 if (!chk_code_allowed(ftest->code))
1044                         return -EINVAL;
1045
1046                 /* Some instructions need special checks */
1047                 switch (ftest->code) {
1048                 case BPF_ALU | BPF_DIV | BPF_K:
1049                 case BPF_ALU | BPF_MOD | BPF_K:
1050                         /* Check for division by zero */
1051                         if (ftest->k == 0)
1052                                 return -EINVAL;
1053                         break;
1054                 case BPF_ALU | BPF_LSH | BPF_K:
1055                 case BPF_ALU | BPF_RSH | BPF_K:
1056                         if (ftest->k >= 32)
1057                                 return -EINVAL;
1058                         break;
1059                 case BPF_LD | BPF_MEM:
1060                 case BPF_LDX | BPF_MEM:
1061                 case BPF_ST:
1062                 case BPF_STX:
1063                         /* Check for invalid memory addresses */
1064                         if (ftest->k >= BPF_MEMWORDS)
1065                                 return -EINVAL;
1066                         break;
1067                 case BPF_JMP | BPF_JA:
1068                         /* Note, the large ftest->k might cause loops.
1069                          * Compare this with conditional jumps below,
1070                          * where offsets are limited. --ANK (981016)
1071                          */
1072                         if (ftest->k >= (unsigned int)(flen - pc - 1))
1073                                 return -EINVAL;
1074                         break;
1075                 case BPF_JMP | BPF_JEQ | BPF_K:
1076                 case BPF_JMP | BPF_JEQ | BPF_X:
1077                 case BPF_JMP | BPF_JGE | BPF_K:
1078                 case BPF_JMP | BPF_JGE | BPF_X:
1079                 case BPF_JMP | BPF_JGT | BPF_K:
1080                 case BPF_JMP | BPF_JGT | BPF_X:
1081                 case BPF_JMP | BPF_JSET | BPF_K:
1082                 case BPF_JMP | BPF_JSET | BPF_X:
1083                         /* Both conditionals must be safe */
1084                         if (pc + ftest->jt + 1 >= flen ||
1085                             pc + ftest->jf + 1 >= flen)
1086                                 return -EINVAL;
1087                         break;
1088                 case BPF_LD | BPF_W | BPF_ABS:
1089                 case BPF_LD | BPF_H | BPF_ABS:
1090                 case BPF_LD | BPF_B | BPF_ABS:
1091                         anc_found = false;
1092                         if (bpf_anc_helper(ftest) & BPF_ANC)
1093                                 anc_found = true;
1094                         /* Ancillary operation unknown or unsupported */
1095                         if (anc_found == false && ftest->k >= SKF_AD_OFF)
1096                                 return -EINVAL;
1097                 }
1098         }
1099
1100         /* Last instruction must be a RET code */
1101         switch (filter[flen - 1].code) {
1102         case BPF_RET | BPF_K:
1103         case BPF_RET | BPF_A:
1104                 return check_load_and_stores(filter, flen);
1105         }
1106
1107         return -EINVAL;
1108 }
1109
1110 static int bpf_prog_store_orig_filter(struct bpf_prog *fp,
1111                                       const struct sock_fprog *fprog)
1112 {
1113         unsigned int fsize = bpf_classic_proglen(fprog);
1114         struct sock_fprog_kern *fkprog;
1115
1116         fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL);
1117         if (!fp->orig_prog)
1118                 return -ENOMEM;
1119
1120         fkprog = fp->orig_prog;
1121         fkprog->len = fprog->len;
1122
1123         fkprog->filter = kmemdup(fp->insns, fsize,
1124                                  GFP_KERNEL | __GFP_NOWARN);
1125         if (!fkprog->filter) {
1126                 kfree(fp->orig_prog);
1127                 return -ENOMEM;
1128         }
1129
1130         return 0;
1131 }
1132
1133 static void bpf_release_orig_filter(struct bpf_prog *fp)
1134 {
1135         struct sock_fprog_kern *fprog = fp->orig_prog;
1136
1137         if (fprog) {
1138                 kfree(fprog->filter);
1139                 kfree(fprog);
1140         }
1141 }
1142
1143 static void __bpf_prog_release(struct bpf_prog *prog)
1144 {
1145         if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) {
1146                 bpf_prog_put(prog);
1147         } else {
1148                 bpf_release_orig_filter(prog);
1149                 bpf_prog_free(prog);
1150         }
1151 }
1152
1153 static void __sk_filter_release(struct sk_filter *fp)
1154 {
1155         __bpf_prog_release(fp->prog);
1156         kfree(fp);
1157 }
1158
1159 /**
1160  *      sk_filter_release_rcu - Release a socket filter by rcu_head
1161  *      @rcu: rcu_head that contains the sk_filter to free
1162  */
1163 static void sk_filter_release_rcu(struct rcu_head *rcu)
1164 {
1165         struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu);
1166
1167         __sk_filter_release(fp);
1168 }
1169
1170 /**
1171  *      sk_filter_release - release a socket filter
1172  *      @fp: filter to remove
1173  *
1174  *      Remove a filter from a socket and release its resources.
1175  */
1176 static void sk_filter_release(struct sk_filter *fp)
1177 {
1178         if (refcount_dec_and_test(&fp->refcnt))
1179                 call_rcu(&fp->rcu, sk_filter_release_rcu);
1180 }
1181
1182 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
1183 {
1184         u32 filter_size = bpf_prog_size(fp->prog->len);
1185
1186         atomic_sub(filter_size, &sk->sk_omem_alloc);
1187         sk_filter_release(fp);
1188 }
1189
1190 /* try to charge the socket memory if there is space available
1191  * return true on success
1192  */
1193 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp)
1194 {
1195         u32 filter_size = bpf_prog_size(fp->prog->len);
1196
1197         /* same check as in sock_kmalloc() */
1198         if (filter_size <= sysctl_optmem_max &&
1199             atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) {
1200                 atomic_add(filter_size, &sk->sk_omem_alloc);
1201                 return true;
1202         }
1203         return false;
1204 }
1205
1206 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp)
1207 {
1208         if (!refcount_inc_not_zero(&fp->refcnt))
1209                 return false;
1210
1211         if (!__sk_filter_charge(sk, fp)) {
1212                 sk_filter_release(fp);
1213                 return false;
1214         }
1215         return true;
1216 }
1217
1218 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp)
1219 {
1220         struct sock_filter *old_prog;
1221         struct bpf_prog *old_fp;
1222         int err, new_len, old_len = fp->len;
1223         bool seen_ld_abs = false;
1224
1225         /* We are free to overwrite insns et al right here as it
1226          * won't be used at this point in time anymore internally
1227          * after the migration to the internal BPF instruction
1228          * representation.
1229          */
1230         BUILD_BUG_ON(sizeof(struct sock_filter) !=
1231                      sizeof(struct bpf_insn));
1232
1233         /* Conversion cannot happen on overlapping memory areas,
1234          * so we need to keep the user BPF around until the 2nd
1235          * pass. At this time, the user BPF is stored in fp->insns.
1236          */
1237         old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter),
1238                            GFP_KERNEL | __GFP_NOWARN);
1239         if (!old_prog) {
1240                 err = -ENOMEM;
1241                 goto out_err;
1242         }
1243
1244         /* 1st pass: calculate the new program length. */
1245         err = bpf_convert_filter(old_prog, old_len, NULL, &new_len,
1246                                  &seen_ld_abs);
1247         if (err)
1248                 goto out_err_free;
1249
1250         /* Expand fp for appending the new filter representation. */
1251         old_fp = fp;
1252         fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0);
1253         if (!fp) {
1254                 /* The old_fp is still around in case we couldn't
1255                  * allocate new memory, so uncharge on that one.
1256                  */
1257                 fp = old_fp;
1258                 err = -ENOMEM;
1259                 goto out_err_free;
1260         }
1261
1262         fp->len = new_len;
1263
1264         /* 2nd pass: remap sock_filter insns into bpf_insn insns. */
1265         err = bpf_convert_filter(old_prog, old_len, fp, &new_len,
1266                                  &seen_ld_abs);
1267         if (err)
1268                 /* 2nd bpf_convert_filter() can fail only if it fails
1269                  * to allocate memory, remapping must succeed. Note,
1270                  * that at this time old_fp has already been released
1271                  * by krealloc().
1272                  */
1273                 goto out_err_free;
1274
1275         fp = bpf_prog_select_runtime(fp, &err);
1276         if (err)
1277                 goto out_err_free;
1278
1279         kfree(old_prog);
1280         return fp;
1281
1282 out_err_free:
1283         kfree(old_prog);
1284 out_err:
1285         __bpf_prog_release(fp);
1286         return ERR_PTR(err);
1287 }
1288
1289 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp,
1290                                            bpf_aux_classic_check_t trans)
1291 {
1292         int err;
1293
1294         fp->bpf_func = NULL;
1295         fp->jited = 0;
1296
1297         err = bpf_check_classic(fp->insns, fp->len);
1298         if (err) {
1299                 __bpf_prog_release(fp);
1300                 return ERR_PTR(err);
1301         }
1302
1303         /* There might be additional checks and transformations
1304          * needed on classic filters, f.e. in case of seccomp.
1305          */
1306         if (trans) {
1307                 err = trans(fp->insns, fp->len);
1308                 if (err) {
1309                         __bpf_prog_release(fp);
1310                         return ERR_PTR(err);
1311                 }
1312         }
1313
1314         /* Probe if we can JIT compile the filter and if so, do
1315          * the compilation of the filter.
1316          */
1317         bpf_jit_compile(fp);
1318
1319         /* JIT compiler couldn't process this filter, so do the
1320          * internal BPF translation for the optimized interpreter.
1321          */
1322         if (!fp->jited)
1323                 fp = bpf_migrate_filter(fp);
1324
1325         return fp;
1326 }
1327
1328 /**
1329  *      bpf_prog_create - create an unattached filter
1330  *      @pfp: the unattached filter that is created
1331  *      @fprog: the filter program
1332  *
1333  * Create a filter independent of any socket. We first run some
1334  * sanity checks on it to make sure it does not explode on us later.
1335  * If an error occurs or there is insufficient memory for the filter
1336  * a negative errno code is returned. On success the return is zero.
1337  */
1338 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog)
1339 {
1340         unsigned int fsize = bpf_classic_proglen(fprog);
1341         struct bpf_prog *fp;
1342
1343         /* Make sure new filter is there and in the right amounts. */
1344         if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1345                 return -EINVAL;
1346
1347         fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1348         if (!fp)
1349                 return -ENOMEM;
1350
1351         memcpy(fp->insns, fprog->filter, fsize);
1352
1353         fp->len = fprog->len;
1354         /* Since unattached filters are not copied back to user
1355          * space through sk_get_filter(), we do not need to hold
1356          * a copy here, and can spare us the work.
1357          */
1358         fp->orig_prog = NULL;
1359
1360         /* bpf_prepare_filter() already takes care of freeing
1361          * memory in case something goes wrong.
1362          */
1363         fp = bpf_prepare_filter(fp, NULL);
1364         if (IS_ERR(fp))
1365                 return PTR_ERR(fp);
1366
1367         *pfp = fp;
1368         return 0;
1369 }
1370 EXPORT_SYMBOL_GPL(bpf_prog_create);
1371
1372 /**
1373  *      bpf_prog_create_from_user - create an unattached filter from user buffer
1374  *      @pfp: the unattached filter that is created
1375  *      @fprog: the filter program
1376  *      @trans: post-classic verifier transformation handler
1377  *      @save_orig: save classic BPF program
1378  *
1379  * This function effectively does the same as bpf_prog_create(), only
1380  * that it builds up its insns buffer from user space provided buffer.
1381  * It also allows for passing a bpf_aux_classic_check_t handler.
1382  */
1383 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
1384                               bpf_aux_classic_check_t trans, bool save_orig)
1385 {
1386         unsigned int fsize = bpf_classic_proglen(fprog);
1387         struct bpf_prog *fp;
1388         int err;
1389
1390         /* Make sure new filter is there and in the right amounts. */
1391         if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1392                 return -EINVAL;
1393
1394         fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1395         if (!fp)
1396                 return -ENOMEM;
1397
1398         if (copy_from_user(fp->insns, fprog->filter, fsize)) {
1399                 __bpf_prog_free(fp);
1400                 return -EFAULT;
1401         }
1402
1403         fp->len = fprog->len;
1404         fp->orig_prog = NULL;
1405
1406         if (save_orig) {
1407                 err = bpf_prog_store_orig_filter(fp, fprog);
1408                 if (err) {
1409                         __bpf_prog_free(fp);
1410                         return -ENOMEM;
1411                 }
1412         }
1413
1414         /* bpf_prepare_filter() already takes care of freeing
1415          * memory in case something goes wrong.
1416          */
1417         fp = bpf_prepare_filter(fp, trans);
1418         if (IS_ERR(fp))
1419                 return PTR_ERR(fp);
1420
1421         *pfp = fp;
1422         return 0;
1423 }
1424 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user);
1425
1426 void bpf_prog_destroy(struct bpf_prog *fp)
1427 {
1428         __bpf_prog_release(fp);
1429 }
1430 EXPORT_SYMBOL_GPL(bpf_prog_destroy);
1431
1432 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk)
1433 {
1434         struct sk_filter *fp, *old_fp;
1435
1436         fp = kmalloc(sizeof(*fp), GFP_KERNEL);
1437         if (!fp)
1438                 return -ENOMEM;
1439
1440         fp->prog = prog;
1441
1442         if (!__sk_filter_charge(sk, fp)) {
1443                 kfree(fp);
1444                 return -ENOMEM;
1445         }
1446         refcount_set(&fp->refcnt, 1);
1447
1448         old_fp = rcu_dereference_protected(sk->sk_filter,
1449                                            lockdep_sock_is_held(sk));
1450         rcu_assign_pointer(sk->sk_filter, fp);
1451
1452         if (old_fp)
1453                 sk_filter_uncharge(sk, old_fp);
1454
1455         return 0;
1456 }
1457
1458 static
1459 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk)
1460 {
1461         unsigned int fsize = bpf_classic_proglen(fprog);
1462         struct bpf_prog *prog;
1463         int err;
1464
1465         if (sock_flag(sk, SOCK_FILTER_LOCKED))
1466                 return ERR_PTR(-EPERM);
1467
1468         /* Make sure new filter is there and in the right amounts. */
1469         if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1470                 return ERR_PTR(-EINVAL);
1471
1472         prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1473         if (!prog)
1474                 return ERR_PTR(-ENOMEM);
1475
1476         if (copy_from_user(prog->insns, fprog->filter, fsize)) {
1477                 __bpf_prog_free(prog);
1478                 return ERR_PTR(-EFAULT);
1479         }
1480
1481         prog->len = fprog->len;
1482
1483         err = bpf_prog_store_orig_filter(prog, fprog);
1484         if (err) {
1485                 __bpf_prog_free(prog);
1486                 return ERR_PTR(-ENOMEM);
1487         }
1488
1489         /* bpf_prepare_filter() already takes care of freeing
1490          * memory in case something goes wrong.
1491          */
1492         return bpf_prepare_filter(prog, NULL);
1493 }
1494
1495 /**
1496  *      sk_attach_filter - attach a socket filter
1497  *      @fprog: the filter program
1498  *      @sk: the socket to use
1499  *
1500  * Attach the user's filter code. We first run some sanity checks on
1501  * it to make sure it does not explode on us later. If an error
1502  * occurs or there is insufficient memory for the filter a negative
1503  * errno code is returned. On success the return is zero.
1504  */
1505 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
1506 {
1507         struct bpf_prog *prog = __get_filter(fprog, sk);
1508         int err;
1509
1510         if (IS_ERR(prog))
1511                 return PTR_ERR(prog);
1512
1513         err = __sk_attach_prog(prog, sk);
1514         if (err < 0) {
1515                 __bpf_prog_release(prog);
1516                 return err;
1517         }
1518
1519         return 0;
1520 }
1521 EXPORT_SYMBOL_GPL(sk_attach_filter);
1522
1523 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk)
1524 {
1525         struct bpf_prog *prog = __get_filter(fprog, sk);
1526         int err;
1527
1528         if (IS_ERR(prog))
1529                 return PTR_ERR(prog);
1530
1531         if (bpf_prog_size(prog->len) > sysctl_optmem_max)
1532                 err = -ENOMEM;
1533         else
1534                 err = reuseport_attach_prog(sk, prog);
1535
1536         if (err)
1537                 __bpf_prog_release(prog);
1538
1539         return err;
1540 }
1541
1542 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk)
1543 {
1544         if (sock_flag(sk, SOCK_FILTER_LOCKED))
1545                 return ERR_PTR(-EPERM);
1546
1547         return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
1548 }
1549
1550 int sk_attach_bpf(u32 ufd, struct sock *sk)
1551 {
1552         struct bpf_prog *prog = __get_bpf(ufd, sk);
1553         int err;
1554
1555         if (IS_ERR(prog))
1556                 return PTR_ERR(prog);
1557
1558         err = __sk_attach_prog(prog, sk);
1559         if (err < 0) {
1560                 bpf_prog_put(prog);
1561                 return err;
1562         }
1563
1564         return 0;
1565 }
1566
1567 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk)
1568 {
1569         struct bpf_prog *prog;
1570         int err;
1571
1572         if (sock_flag(sk, SOCK_FILTER_LOCKED))
1573                 return -EPERM;
1574
1575         prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
1576         if (PTR_ERR(prog) == -EINVAL)
1577                 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT);
1578         if (IS_ERR(prog))
1579                 return PTR_ERR(prog);
1580
1581         if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) {
1582                 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER
1583                  * bpf prog (e.g. sockmap).  It depends on the
1584                  * limitation imposed by bpf_prog_load().
1585                  * Hence, sysctl_optmem_max is not checked.
1586                  */
1587                 if ((sk->sk_type != SOCK_STREAM &&
1588                      sk->sk_type != SOCK_DGRAM) ||
1589                     (sk->sk_protocol != IPPROTO_UDP &&
1590                      sk->sk_protocol != IPPROTO_TCP) ||
1591                     (sk->sk_family != AF_INET &&
1592                      sk->sk_family != AF_INET6)) {
1593                         err = -ENOTSUPP;
1594                         goto err_prog_put;
1595                 }
1596         } else {
1597                 /* BPF_PROG_TYPE_SOCKET_FILTER */
1598                 if (bpf_prog_size(prog->len) > sysctl_optmem_max) {
1599                         err = -ENOMEM;
1600                         goto err_prog_put;
1601                 }
1602         }
1603
1604         err = reuseport_attach_prog(sk, prog);
1605 err_prog_put:
1606         if (err)
1607                 bpf_prog_put(prog);
1608
1609         return err;
1610 }
1611
1612 void sk_reuseport_prog_free(struct bpf_prog *prog)
1613 {
1614         if (!prog)
1615                 return;
1616
1617         if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT)
1618                 bpf_prog_put(prog);
1619         else
1620                 bpf_prog_destroy(prog);
1621 }
1622
1623 struct bpf_scratchpad {
1624         union {
1625                 __be32 diff[MAX_BPF_STACK / sizeof(__be32)];
1626                 u8     buff[MAX_BPF_STACK];
1627         };
1628 };
1629
1630 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp);
1631
1632 static inline int __bpf_try_make_writable(struct sk_buff *skb,
1633                                           unsigned int write_len)
1634 {
1635         return skb_ensure_writable(skb, write_len);
1636 }
1637
1638 static inline int bpf_try_make_writable(struct sk_buff *skb,
1639                                         unsigned int write_len)
1640 {
1641         int err = __bpf_try_make_writable(skb, write_len);
1642
1643         bpf_compute_data_pointers(skb);
1644         return err;
1645 }
1646
1647 static int bpf_try_make_head_writable(struct sk_buff *skb)
1648 {
1649         return bpf_try_make_writable(skb, skb_headlen(skb));
1650 }
1651
1652 static inline void bpf_push_mac_rcsum(struct sk_buff *skb)
1653 {
1654         if (skb_at_tc_ingress(skb))
1655                 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1656 }
1657
1658 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb)
1659 {
1660         if (skb_at_tc_ingress(skb))
1661                 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1662 }
1663
1664 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset,
1665            const void *, from, u32, len, u64, flags)
1666 {
1667         void *ptr;
1668
1669         if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH)))
1670                 return -EINVAL;
1671         if (unlikely(offset > 0xffff))
1672                 return -EFAULT;
1673         if (unlikely(bpf_try_make_writable(skb, offset + len)))
1674                 return -EFAULT;
1675
1676         ptr = skb->data + offset;
1677         if (flags & BPF_F_RECOMPUTE_CSUM)
1678                 __skb_postpull_rcsum(skb, ptr, len, offset);
1679
1680         memcpy(ptr, from, len);
1681
1682         if (flags & BPF_F_RECOMPUTE_CSUM)
1683                 __skb_postpush_rcsum(skb, ptr, len, offset);
1684         if (flags & BPF_F_INVALIDATE_HASH)
1685                 skb_clear_hash(skb);
1686
1687         return 0;
1688 }
1689
1690 static const struct bpf_func_proto bpf_skb_store_bytes_proto = {
1691         .func           = bpf_skb_store_bytes,
1692         .gpl_only       = false,
1693         .ret_type       = RET_INTEGER,
1694         .arg1_type      = ARG_PTR_TO_CTX,
1695         .arg2_type      = ARG_ANYTHING,
1696         .arg3_type      = ARG_PTR_TO_MEM,
1697         .arg4_type      = ARG_CONST_SIZE,
1698         .arg5_type      = ARG_ANYTHING,
1699 };
1700
1701 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset,
1702            void *, to, u32, len)
1703 {
1704         void *ptr;
1705
1706         if (unlikely(offset > 0xffff))
1707                 goto err_clear;
1708
1709         ptr = skb_header_pointer(skb, offset, len, to);
1710         if (unlikely(!ptr))
1711                 goto err_clear;
1712         if (ptr != to)
1713                 memcpy(to, ptr, len);
1714
1715         return 0;
1716 err_clear:
1717         memset(to, 0, len);
1718         return -EFAULT;
1719 }
1720
1721 static const struct bpf_func_proto bpf_skb_load_bytes_proto = {
1722         .func           = bpf_skb_load_bytes,
1723         .gpl_only       = false,
1724         .ret_type       = RET_INTEGER,
1725         .arg1_type      = ARG_PTR_TO_CTX,
1726         .arg2_type      = ARG_ANYTHING,
1727         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
1728         .arg4_type      = ARG_CONST_SIZE,
1729 };
1730
1731 BPF_CALL_4(bpf_flow_dissector_load_bytes,
1732            const struct bpf_flow_dissector *, ctx, u32, offset,
1733            void *, to, u32, len)
1734 {
1735         void *ptr;
1736
1737         if (unlikely(offset > 0xffff))
1738                 goto err_clear;
1739
1740         if (unlikely(!ctx->skb))
1741                 goto err_clear;
1742
1743         ptr = skb_header_pointer(ctx->skb, offset, len, to);
1744         if (unlikely(!ptr))
1745                 goto err_clear;
1746         if (ptr != to)
1747                 memcpy(to, ptr, len);
1748
1749         return 0;
1750 err_clear:
1751         memset(to, 0, len);
1752         return -EFAULT;
1753 }
1754
1755 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = {
1756         .func           = bpf_flow_dissector_load_bytes,
1757         .gpl_only       = false,
1758         .ret_type       = RET_INTEGER,
1759         .arg1_type      = ARG_PTR_TO_CTX,
1760         .arg2_type      = ARG_ANYTHING,
1761         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
1762         .arg4_type      = ARG_CONST_SIZE,
1763 };
1764
1765 BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb,
1766            u32, offset, void *, to, u32, len, u32, start_header)
1767 {
1768         u8 *end = skb_tail_pointer(skb);
1769         u8 *net = skb_network_header(skb);
1770         u8 *mac = skb_mac_header(skb);
1771         u8 *ptr;
1772
1773         if (unlikely(offset > 0xffff || len > (end - mac)))
1774                 goto err_clear;
1775
1776         switch (start_header) {
1777         case BPF_HDR_START_MAC:
1778                 ptr = mac + offset;
1779                 break;
1780         case BPF_HDR_START_NET:
1781                 ptr = net + offset;
1782                 break;
1783         default:
1784                 goto err_clear;
1785         }
1786
1787         if (likely(ptr >= mac && ptr + len <= end)) {
1788                 memcpy(to, ptr, len);
1789                 return 0;
1790         }
1791
1792 err_clear:
1793         memset(to, 0, len);
1794         return -EFAULT;
1795 }
1796
1797 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = {
1798         .func           = bpf_skb_load_bytes_relative,
1799         .gpl_only       = false,
1800         .ret_type       = RET_INTEGER,
1801         .arg1_type      = ARG_PTR_TO_CTX,
1802         .arg2_type      = ARG_ANYTHING,
1803         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
1804         .arg4_type      = ARG_CONST_SIZE,
1805         .arg5_type      = ARG_ANYTHING,
1806 };
1807
1808 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len)
1809 {
1810         /* Idea is the following: should the needed direct read/write
1811          * test fail during runtime, we can pull in more data and redo
1812          * again, since implicitly, we invalidate previous checks here.
1813          *
1814          * Or, since we know how much we need to make read/writeable,
1815          * this can be done once at the program beginning for direct
1816          * access case. By this we overcome limitations of only current
1817          * headroom being accessible.
1818          */
1819         return bpf_try_make_writable(skb, len ? : skb_headlen(skb));
1820 }
1821
1822 static const struct bpf_func_proto bpf_skb_pull_data_proto = {
1823         .func           = bpf_skb_pull_data,
1824         .gpl_only       = false,
1825         .ret_type       = RET_INTEGER,
1826         .arg1_type      = ARG_PTR_TO_CTX,
1827         .arg2_type      = ARG_ANYTHING,
1828 };
1829
1830 BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk)
1831 {
1832         return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL;
1833 }
1834
1835 static const struct bpf_func_proto bpf_sk_fullsock_proto = {
1836         .func           = bpf_sk_fullsock,
1837         .gpl_only       = false,
1838         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
1839         .arg1_type      = ARG_PTR_TO_SOCK_COMMON,
1840 };
1841
1842 static inline int sk_skb_try_make_writable(struct sk_buff *skb,
1843                                            unsigned int write_len)
1844 {
1845         int err = __bpf_try_make_writable(skb, write_len);
1846
1847         bpf_compute_data_end_sk_skb(skb);
1848         return err;
1849 }
1850
1851 BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len)
1852 {
1853         /* Idea is the following: should the needed direct read/write
1854          * test fail during runtime, we can pull in more data and redo
1855          * again, since implicitly, we invalidate previous checks here.
1856          *
1857          * Or, since we know how much we need to make read/writeable,
1858          * this can be done once at the program beginning for direct
1859          * access case. By this we overcome limitations of only current
1860          * headroom being accessible.
1861          */
1862         return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb));
1863 }
1864
1865 static const struct bpf_func_proto sk_skb_pull_data_proto = {
1866         .func           = sk_skb_pull_data,
1867         .gpl_only       = false,
1868         .ret_type       = RET_INTEGER,
1869         .arg1_type      = ARG_PTR_TO_CTX,
1870         .arg2_type      = ARG_ANYTHING,
1871 };
1872
1873 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset,
1874            u64, from, u64, to, u64, flags)
1875 {
1876         __sum16 *ptr;
1877
1878         if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK)))
1879                 return -EINVAL;
1880         if (unlikely(offset > 0xffff || offset & 1))
1881                 return -EFAULT;
1882         if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
1883                 return -EFAULT;
1884
1885         ptr = (__sum16 *)(skb->data + offset);
1886         switch (flags & BPF_F_HDR_FIELD_MASK) {
1887         case 0:
1888                 if (unlikely(from != 0))
1889                         return -EINVAL;
1890
1891                 csum_replace_by_diff(ptr, to);
1892                 break;
1893         case 2:
1894                 csum_replace2(ptr, from, to);
1895                 break;
1896         case 4:
1897                 csum_replace4(ptr, from, to);
1898                 break;
1899         default:
1900                 return -EINVAL;
1901         }
1902
1903         return 0;
1904 }
1905
1906 static const struct bpf_func_proto bpf_l3_csum_replace_proto = {
1907         .func           = bpf_l3_csum_replace,
1908         .gpl_only       = false,
1909         .ret_type       = RET_INTEGER,
1910         .arg1_type      = ARG_PTR_TO_CTX,
1911         .arg2_type      = ARG_ANYTHING,
1912         .arg3_type      = ARG_ANYTHING,
1913         .arg4_type      = ARG_ANYTHING,
1914         .arg5_type      = ARG_ANYTHING,
1915 };
1916
1917 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset,
1918            u64, from, u64, to, u64, flags)
1919 {
1920         bool is_pseudo = flags & BPF_F_PSEUDO_HDR;
1921         bool is_mmzero = flags & BPF_F_MARK_MANGLED_0;
1922         bool do_mforce = flags & BPF_F_MARK_ENFORCE;
1923         __sum16 *ptr;
1924
1925         if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE |
1926                                BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK)))
1927                 return -EINVAL;
1928         if (unlikely(offset > 0xffff || offset & 1))
1929                 return -EFAULT;
1930         if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
1931                 return -EFAULT;
1932
1933         ptr = (__sum16 *)(skb->data + offset);
1934         if (is_mmzero && !do_mforce && !*ptr)
1935                 return 0;
1936
1937         switch (flags & BPF_F_HDR_FIELD_MASK) {
1938         case 0:
1939                 if (unlikely(from != 0))
1940                         return -EINVAL;
1941
1942                 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo);
1943                 break;
1944         case 2:
1945                 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo);
1946                 break;
1947         case 4:
1948                 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo);
1949                 break;
1950         default:
1951                 return -EINVAL;
1952         }
1953
1954         if (is_mmzero && !*ptr)
1955                 *ptr = CSUM_MANGLED_0;
1956         return 0;
1957 }
1958
1959 static const struct bpf_func_proto bpf_l4_csum_replace_proto = {
1960         .func           = bpf_l4_csum_replace,
1961         .gpl_only       = false,
1962         .ret_type       = RET_INTEGER,
1963         .arg1_type      = ARG_PTR_TO_CTX,
1964         .arg2_type      = ARG_ANYTHING,
1965         .arg3_type      = ARG_ANYTHING,
1966         .arg4_type      = ARG_ANYTHING,
1967         .arg5_type      = ARG_ANYTHING,
1968 };
1969
1970 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size,
1971            __be32 *, to, u32, to_size, __wsum, seed)
1972 {
1973         struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp);
1974         u32 diff_size = from_size + to_size;
1975         int i, j = 0;
1976
1977         /* This is quite flexible, some examples:
1978          *
1979          * from_size == 0, to_size > 0,  seed := csum --> pushing data
1980          * from_size > 0,  to_size == 0, seed := csum --> pulling data
1981          * from_size > 0,  to_size > 0,  seed := 0    --> diffing data
1982          *
1983          * Even for diffing, from_size and to_size don't need to be equal.
1984          */
1985         if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) ||
1986                      diff_size > sizeof(sp->diff)))
1987                 return -EINVAL;
1988
1989         for (i = 0; i < from_size / sizeof(__be32); i++, j++)
1990                 sp->diff[j] = ~from[i];
1991         for (i = 0; i <   to_size / sizeof(__be32); i++, j++)
1992                 sp->diff[j] = to[i];
1993
1994         return csum_partial(sp->diff, diff_size, seed);
1995 }
1996
1997 static const struct bpf_func_proto bpf_csum_diff_proto = {
1998         .func           = bpf_csum_diff,
1999         .gpl_only       = false,
2000         .pkt_access     = true,
2001         .ret_type       = RET_INTEGER,
2002         .arg1_type      = ARG_PTR_TO_MEM_OR_NULL,
2003         .arg2_type      = ARG_CONST_SIZE_OR_ZERO,
2004         .arg3_type      = ARG_PTR_TO_MEM_OR_NULL,
2005         .arg4_type      = ARG_CONST_SIZE_OR_ZERO,
2006         .arg5_type      = ARG_ANYTHING,
2007 };
2008
2009 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum)
2010 {
2011         /* The interface is to be used in combination with bpf_csum_diff()
2012          * for direct packet writes. csum rotation for alignment as well
2013          * as emulating csum_sub() can be done from the eBPF program.
2014          */
2015         if (skb->ip_summed == CHECKSUM_COMPLETE)
2016                 return (skb->csum = csum_add(skb->csum, csum));
2017
2018         return -ENOTSUPP;
2019 }
2020
2021 static const struct bpf_func_proto bpf_csum_update_proto = {
2022         .func           = bpf_csum_update,
2023         .gpl_only       = false,
2024         .ret_type       = RET_INTEGER,
2025         .arg1_type      = ARG_PTR_TO_CTX,
2026         .arg2_type      = ARG_ANYTHING,
2027 };
2028
2029 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb)
2030 {
2031         return dev_forward_skb(dev, skb);
2032 }
2033
2034 static inline int __bpf_rx_skb_no_mac(struct net_device *dev,
2035                                       struct sk_buff *skb)
2036 {
2037         int ret = ____dev_forward_skb(dev, skb);
2038
2039         if (likely(!ret)) {
2040                 skb->dev = dev;
2041                 ret = netif_rx(skb);
2042         }
2043
2044         return ret;
2045 }
2046
2047 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb)
2048 {
2049         int ret;
2050
2051         if (dev_xmit_recursion()) {
2052                 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2053                 kfree_skb(skb);
2054                 return -ENETDOWN;
2055         }
2056
2057         skb->dev = dev;
2058         skb->tstamp = 0;
2059
2060         dev_xmit_recursion_inc();
2061         ret = dev_queue_xmit(skb);
2062         dev_xmit_recursion_dec();
2063
2064         return ret;
2065 }
2066
2067 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev,
2068                                  u32 flags)
2069 {
2070         unsigned int mlen = skb_network_offset(skb);
2071
2072         if (mlen) {
2073                 __skb_pull(skb, mlen);
2074
2075                 /* At ingress, the mac header has already been pulled once.
2076                  * At egress, skb_pospull_rcsum has to be done in case that
2077                  * the skb is originated from ingress (i.e. a forwarded skb)
2078                  * to ensure that rcsum starts at net header.
2079                  */
2080                 if (!skb_at_tc_ingress(skb))
2081                         skb_postpull_rcsum(skb, skb_mac_header(skb), mlen);
2082         }
2083         skb_pop_mac_header(skb);
2084         skb_reset_mac_len(skb);
2085         return flags & BPF_F_INGRESS ?
2086                __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb);
2087 }
2088
2089 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev,
2090                                  u32 flags)
2091 {
2092         /* Verify that a link layer header is carried */
2093         if (unlikely(skb->mac_header >= skb->network_header)) {
2094                 kfree_skb(skb);
2095                 return -ERANGE;
2096         }
2097
2098         bpf_push_mac_rcsum(skb);
2099         return flags & BPF_F_INGRESS ?
2100                __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb);
2101 }
2102
2103 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev,
2104                           u32 flags)
2105 {
2106         if (dev_is_mac_header_xmit(dev))
2107                 return __bpf_redirect_common(skb, dev, flags);
2108         else
2109                 return __bpf_redirect_no_mac(skb, dev, flags);
2110 }
2111
2112 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags)
2113 {
2114         struct net_device *dev;
2115         struct sk_buff *clone;
2116         int ret;
2117
2118         if (unlikely(flags & ~(BPF_F_INGRESS)))
2119                 return -EINVAL;
2120
2121         dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex);
2122         if (unlikely(!dev))
2123                 return -EINVAL;
2124
2125         clone = skb_clone(skb, GFP_ATOMIC);
2126         if (unlikely(!clone))
2127                 return -ENOMEM;
2128
2129         /* For direct write, we need to keep the invariant that the skbs
2130          * we're dealing with need to be uncloned. Should uncloning fail
2131          * here, we need to free the just generated clone to unclone once
2132          * again.
2133          */
2134         ret = bpf_try_make_head_writable(skb);
2135         if (unlikely(ret)) {
2136                 kfree_skb(clone);
2137                 return -ENOMEM;
2138         }
2139
2140         return __bpf_redirect(clone, dev, flags);
2141 }
2142
2143 static const struct bpf_func_proto bpf_clone_redirect_proto = {
2144         .func           = bpf_clone_redirect,
2145         .gpl_only       = false,
2146         .ret_type       = RET_INTEGER,
2147         .arg1_type      = ARG_PTR_TO_CTX,
2148         .arg2_type      = ARG_ANYTHING,
2149         .arg3_type      = ARG_ANYTHING,
2150 };
2151
2152 DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
2153 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info);
2154
2155 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags)
2156 {
2157         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2158
2159         if (unlikely(flags & ~(BPF_F_INGRESS)))
2160                 return TC_ACT_SHOT;
2161
2162         ri->flags = flags;
2163         ri->tgt_index = ifindex;
2164
2165         return TC_ACT_REDIRECT;
2166 }
2167
2168 int skb_do_redirect(struct sk_buff *skb)
2169 {
2170         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2171         struct net_device *dev;
2172
2173         dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->tgt_index);
2174         ri->tgt_index = 0;
2175         if (unlikely(!dev)) {
2176                 kfree_skb(skb);
2177                 return -EINVAL;
2178         }
2179
2180         return __bpf_redirect(skb, dev, ri->flags);
2181 }
2182
2183 static const struct bpf_func_proto bpf_redirect_proto = {
2184         .func           = bpf_redirect,
2185         .gpl_only       = false,
2186         .ret_type       = RET_INTEGER,
2187         .arg1_type      = ARG_ANYTHING,
2188         .arg2_type      = ARG_ANYTHING,
2189 };
2190
2191 BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes)
2192 {
2193         msg->apply_bytes = bytes;
2194         return 0;
2195 }
2196
2197 static const struct bpf_func_proto bpf_msg_apply_bytes_proto = {
2198         .func           = bpf_msg_apply_bytes,
2199         .gpl_only       = false,
2200         .ret_type       = RET_INTEGER,
2201         .arg1_type      = ARG_PTR_TO_CTX,
2202         .arg2_type      = ARG_ANYTHING,
2203 };
2204
2205 BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes)
2206 {
2207         msg->cork_bytes = bytes;
2208         return 0;
2209 }
2210
2211 static const struct bpf_func_proto bpf_msg_cork_bytes_proto = {
2212         .func           = bpf_msg_cork_bytes,
2213         .gpl_only       = false,
2214         .ret_type       = RET_INTEGER,
2215         .arg1_type      = ARG_PTR_TO_CTX,
2216         .arg2_type      = ARG_ANYTHING,
2217 };
2218
2219 BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start,
2220            u32, end, u64, flags)
2221 {
2222         u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start;
2223         u32 first_sge, last_sge, i, shift, bytes_sg_total;
2224         struct scatterlist *sge;
2225         u8 *raw, *to, *from;
2226         struct page *page;
2227
2228         if (unlikely(flags || end <= start))
2229                 return -EINVAL;
2230
2231         /* First find the starting scatterlist element */
2232         i = msg->sg.start;
2233         do {
2234                 offset += len;
2235                 len = sk_msg_elem(msg, i)->length;
2236                 if (start < offset + len)
2237                         break;
2238                 sk_msg_iter_var_next(i);
2239         } while (i != msg->sg.end);
2240
2241         if (unlikely(start >= offset + len))
2242                 return -EINVAL;
2243
2244         first_sge = i;
2245         /* The start may point into the sg element so we need to also
2246          * account for the headroom.
2247          */
2248         bytes_sg_total = start - offset + bytes;
2249         if (!test_bit(i, &msg->sg.copy) && bytes_sg_total <= len)
2250                 goto out;
2251
2252         /* At this point we need to linearize multiple scatterlist
2253          * elements or a single shared page. Either way we need to
2254          * copy into a linear buffer exclusively owned by BPF. Then
2255          * place the buffer in the scatterlist and fixup the original
2256          * entries by removing the entries now in the linear buffer
2257          * and shifting the remaining entries. For now we do not try
2258          * to copy partial entries to avoid complexity of running out
2259          * of sg_entry slots. The downside is reading a single byte
2260          * will copy the entire sg entry.
2261          */
2262         do {
2263                 copy += sk_msg_elem(msg, i)->length;
2264                 sk_msg_iter_var_next(i);
2265                 if (bytes_sg_total <= copy)
2266                         break;
2267         } while (i != msg->sg.end);
2268         last_sge = i;
2269
2270         if (unlikely(bytes_sg_total > copy))
2271                 return -EINVAL;
2272
2273         page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP,
2274                            get_order(copy));
2275         if (unlikely(!page))
2276                 return -ENOMEM;
2277
2278         raw = page_address(page);
2279         i = first_sge;
2280         do {
2281                 sge = sk_msg_elem(msg, i);
2282                 from = sg_virt(sge);
2283                 len = sge->length;
2284                 to = raw + poffset;
2285
2286                 memcpy(to, from, len);
2287                 poffset += len;
2288                 sge->length = 0;
2289                 put_page(sg_page(sge));
2290
2291                 sk_msg_iter_var_next(i);
2292         } while (i != last_sge);
2293
2294         sg_set_page(&msg->sg.data[first_sge], page, copy, 0);
2295
2296         /* To repair sg ring we need to shift entries. If we only
2297          * had a single entry though we can just replace it and
2298          * be done. Otherwise walk the ring and shift the entries.
2299          */
2300         WARN_ON_ONCE(last_sge == first_sge);
2301         shift = last_sge > first_sge ?
2302                 last_sge - first_sge - 1 :
2303                 NR_MSG_FRAG_IDS - first_sge + last_sge - 1;
2304         if (!shift)
2305                 goto out;
2306
2307         i = first_sge;
2308         sk_msg_iter_var_next(i);
2309         do {
2310                 u32 move_from;
2311
2312                 if (i + shift >= NR_MSG_FRAG_IDS)
2313                         move_from = i + shift - NR_MSG_FRAG_IDS;
2314                 else
2315                         move_from = i + shift;
2316                 if (move_from == msg->sg.end)
2317                         break;
2318
2319                 msg->sg.data[i] = msg->sg.data[move_from];
2320                 msg->sg.data[move_from].length = 0;
2321                 msg->sg.data[move_from].page_link = 0;
2322                 msg->sg.data[move_from].offset = 0;
2323                 sk_msg_iter_var_next(i);
2324         } while (1);
2325
2326         msg->sg.end = msg->sg.end - shift > msg->sg.end ?
2327                       msg->sg.end - shift + NR_MSG_FRAG_IDS :
2328                       msg->sg.end - shift;
2329 out:
2330         msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset;
2331         msg->data_end = msg->data + bytes;
2332         return 0;
2333 }
2334
2335 static const struct bpf_func_proto bpf_msg_pull_data_proto = {
2336         .func           = bpf_msg_pull_data,
2337         .gpl_only       = false,
2338         .ret_type       = RET_INTEGER,
2339         .arg1_type      = ARG_PTR_TO_CTX,
2340         .arg2_type      = ARG_ANYTHING,
2341         .arg3_type      = ARG_ANYTHING,
2342         .arg4_type      = ARG_ANYTHING,
2343 };
2344
2345 BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start,
2346            u32, len, u64, flags)
2347 {
2348         struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge;
2349         u32 new, i = 0, l = 0, space, copy = 0, offset = 0;
2350         u8 *raw, *to, *from;
2351         struct page *page;
2352
2353         if (unlikely(flags))
2354                 return -EINVAL;
2355
2356         /* First find the starting scatterlist element */
2357         i = msg->sg.start;
2358         do {
2359                 offset += l;
2360                 l = sk_msg_elem(msg, i)->length;
2361
2362                 if (start < offset + l)
2363                         break;
2364                 sk_msg_iter_var_next(i);
2365         } while (i != msg->sg.end);
2366
2367         if (start >= offset + l)
2368                 return -EINVAL;
2369
2370         space = MAX_MSG_FRAGS - sk_msg_elem_used(msg);
2371
2372         /* If no space available will fallback to copy, we need at
2373          * least one scatterlist elem available to push data into
2374          * when start aligns to the beginning of an element or two
2375          * when it falls inside an element. We handle the start equals
2376          * offset case because its the common case for inserting a
2377          * header.
2378          */
2379         if (!space || (space == 1 && start != offset))
2380                 copy = msg->sg.data[i].length;
2381
2382         page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP,
2383                            get_order(copy + len));
2384         if (unlikely(!page))
2385                 return -ENOMEM;
2386
2387         if (copy) {
2388                 int front, back;
2389
2390                 raw = page_address(page);
2391
2392                 psge = sk_msg_elem(msg, i);
2393                 front = start - offset;
2394                 back = psge->length - front;
2395                 from = sg_virt(psge);
2396
2397                 if (front)
2398                         memcpy(raw, from, front);
2399
2400                 if (back) {
2401                         from += front;
2402                         to = raw + front + len;
2403
2404                         memcpy(to, from, back);
2405                 }
2406
2407                 put_page(sg_page(psge));
2408         } else if (start - offset) {
2409                 psge = sk_msg_elem(msg, i);
2410                 rsge = sk_msg_elem_cpy(msg, i);
2411
2412                 psge->length = start - offset;
2413                 rsge.length -= psge->length;
2414                 rsge.offset += start;
2415
2416                 sk_msg_iter_var_next(i);
2417                 sg_unmark_end(psge);
2418                 sg_unmark_end(&rsge);
2419                 sk_msg_iter_next(msg, end);
2420         }
2421
2422         /* Slot(s) to place newly allocated data */
2423         new = i;
2424
2425         /* Shift one or two slots as needed */
2426         if (!copy) {
2427                 sge = sk_msg_elem_cpy(msg, i);
2428
2429                 sk_msg_iter_var_next(i);
2430                 sg_unmark_end(&sge);
2431                 sk_msg_iter_next(msg, end);
2432
2433                 nsge = sk_msg_elem_cpy(msg, i);
2434                 if (rsge.length) {
2435                         sk_msg_iter_var_next(i);
2436                         nnsge = sk_msg_elem_cpy(msg, i);
2437                 }
2438
2439                 while (i != msg->sg.end) {
2440                         msg->sg.data[i] = sge;
2441                         sge = nsge;
2442                         sk_msg_iter_var_next(i);
2443                         if (rsge.length) {
2444                                 nsge = nnsge;
2445                                 nnsge = sk_msg_elem_cpy(msg, i);
2446                         } else {
2447                                 nsge = sk_msg_elem_cpy(msg, i);
2448                         }
2449                 }
2450         }
2451
2452         /* Place newly allocated data buffer */
2453         sk_mem_charge(msg->sk, len);
2454         msg->sg.size += len;
2455         __clear_bit(new, &msg->sg.copy);
2456         sg_set_page(&msg->sg.data[new], page, len + copy, 0);
2457         if (rsge.length) {
2458                 get_page(sg_page(&rsge));
2459                 sk_msg_iter_var_next(new);
2460                 msg->sg.data[new] = rsge;
2461         }
2462
2463         sk_msg_compute_data_pointers(msg);
2464         return 0;
2465 }
2466
2467 static const struct bpf_func_proto bpf_msg_push_data_proto = {
2468         .func           = bpf_msg_push_data,
2469         .gpl_only       = false,
2470         .ret_type       = RET_INTEGER,
2471         .arg1_type      = ARG_PTR_TO_CTX,
2472         .arg2_type      = ARG_ANYTHING,
2473         .arg3_type      = ARG_ANYTHING,
2474         .arg4_type      = ARG_ANYTHING,
2475 };
2476
2477 static void sk_msg_shift_left(struct sk_msg *msg, int i)
2478 {
2479         int prev;
2480
2481         do {
2482                 prev = i;
2483                 sk_msg_iter_var_next(i);
2484                 msg->sg.data[prev] = msg->sg.data[i];
2485         } while (i != msg->sg.end);
2486
2487         sk_msg_iter_prev(msg, end);
2488 }
2489
2490 static void sk_msg_shift_right(struct sk_msg *msg, int i)
2491 {
2492         struct scatterlist tmp, sge;
2493
2494         sk_msg_iter_next(msg, end);
2495         sge = sk_msg_elem_cpy(msg, i);
2496         sk_msg_iter_var_next(i);
2497         tmp = sk_msg_elem_cpy(msg, i);
2498
2499         while (i != msg->sg.end) {
2500                 msg->sg.data[i] = sge;
2501                 sk_msg_iter_var_next(i);
2502                 sge = tmp;
2503                 tmp = sk_msg_elem_cpy(msg, i);
2504         }
2505 }
2506
2507 BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start,
2508            u32, len, u64, flags)
2509 {
2510         u32 i = 0, l = 0, space, offset = 0;
2511         u64 last = start + len;
2512         int pop;
2513
2514         if (unlikely(flags))
2515                 return -EINVAL;
2516
2517         /* First find the starting scatterlist element */
2518         i = msg->sg.start;
2519         do {
2520                 offset += l;
2521                 l = sk_msg_elem(msg, i)->length;
2522
2523                 if (start < offset + l)
2524                         break;
2525                 sk_msg_iter_var_next(i);
2526         } while (i != msg->sg.end);
2527
2528         /* Bounds checks: start and pop must be inside message */
2529         if (start >= offset + l || last >= msg->sg.size)
2530                 return -EINVAL;
2531
2532         space = MAX_MSG_FRAGS - sk_msg_elem_used(msg);
2533
2534         pop = len;
2535         /* --------------| offset
2536          * -| start      |-------- len -------|
2537          *
2538          *  |----- a ----|-------- pop -------|----- b ----|
2539          *  |______________________________________________| length
2540          *
2541          *
2542          * a:   region at front of scatter element to save
2543          * b:   region at back of scatter element to save when length > A + pop
2544          * pop: region to pop from element, same as input 'pop' here will be
2545          *      decremented below per iteration.
2546          *
2547          * Two top-level cases to handle when start != offset, first B is non
2548          * zero and second B is zero corresponding to when a pop includes more
2549          * than one element.
2550          *
2551          * Then if B is non-zero AND there is no space allocate space and
2552          * compact A, B regions into page. If there is space shift ring to
2553          * the rigth free'ing the next element in ring to place B, leaving
2554          * A untouched except to reduce length.
2555          */
2556         if (start != offset) {
2557                 struct scatterlist *nsge, *sge = sk_msg_elem(msg, i);
2558                 int a = start;
2559                 int b = sge->length - pop - a;
2560
2561                 sk_msg_iter_var_next(i);
2562
2563                 if (pop < sge->length - a) {
2564                         if (space) {
2565                                 sge->length = a;
2566                                 sk_msg_shift_right(msg, i);
2567                                 nsge = sk_msg_elem(msg, i);
2568                                 get_page(sg_page(sge));
2569                                 sg_set_page(nsge,
2570                                             sg_page(sge),
2571                                             b, sge->offset + pop + a);
2572                         } else {
2573                                 struct page *page, *orig;
2574                                 u8 *to, *from;
2575
2576                                 page = alloc_pages(__GFP_NOWARN |
2577                                                    __GFP_COMP   | GFP_ATOMIC,
2578                                                    get_order(a + b));
2579                                 if (unlikely(!page))
2580                                         return -ENOMEM;
2581
2582                                 sge->length = a;
2583                                 orig = sg_page(sge);
2584                                 from = sg_virt(sge);
2585                                 to = page_address(page);
2586                                 memcpy(to, from, a);
2587                                 memcpy(to + a, from + a + pop, b);
2588                                 sg_set_page(sge, page, a + b, 0);
2589                                 put_page(orig);
2590                         }
2591                         pop = 0;
2592                 } else if (pop >= sge->length - a) {
2593                         sge->length = a;
2594                         pop -= (sge->length - a);
2595                 }
2596         }
2597
2598         /* From above the current layout _must_ be as follows,
2599          *
2600          * -| offset
2601          * -| start
2602          *
2603          *  |---- pop ---|---------------- b ------------|
2604          *  |____________________________________________| length
2605          *
2606          * Offset and start of the current msg elem are equal because in the
2607          * previous case we handled offset != start and either consumed the
2608          * entire element and advanced to the next element OR pop == 0.
2609          *
2610          * Two cases to handle here are first pop is less than the length
2611          * leaving some remainder b above. Simply adjust the element's layout
2612          * in this case. Or pop >= length of the element so that b = 0. In this
2613          * case advance to next element decrementing pop.
2614          */
2615         while (pop) {
2616                 struct scatterlist *sge = sk_msg_elem(msg, i);
2617
2618                 if (pop < sge->length) {
2619                         sge->length -= pop;
2620                         sge->offset += pop;
2621                         pop = 0;
2622                 } else {
2623                         pop -= sge->length;
2624                         sk_msg_shift_left(msg, i);
2625                 }
2626                 sk_msg_iter_var_next(i);
2627         }
2628
2629         sk_mem_uncharge(msg->sk, len - pop);
2630         msg->sg.size -= (len - pop);
2631         sk_msg_compute_data_pointers(msg);
2632         return 0;
2633 }
2634
2635 static const struct bpf_func_proto bpf_msg_pop_data_proto = {
2636         .func           = bpf_msg_pop_data,
2637         .gpl_only       = false,
2638         .ret_type       = RET_INTEGER,
2639         .arg1_type      = ARG_PTR_TO_CTX,
2640         .arg2_type      = ARG_ANYTHING,
2641         .arg3_type      = ARG_ANYTHING,
2642         .arg4_type      = ARG_ANYTHING,
2643 };
2644
2645 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb)
2646 {
2647         return task_get_classid(skb);
2648 }
2649
2650 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = {
2651         .func           = bpf_get_cgroup_classid,
2652         .gpl_only       = false,
2653         .ret_type       = RET_INTEGER,
2654         .arg1_type      = ARG_PTR_TO_CTX,
2655 };
2656
2657 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb)
2658 {
2659         return dst_tclassid(skb);
2660 }
2661
2662 static const struct bpf_func_proto bpf_get_route_realm_proto = {
2663         .func           = bpf_get_route_realm,
2664         .gpl_only       = false,
2665         .ret_type       = RET_INTEGER,
2666         .arg1_type      = ARG_PTR_TO_CTX,
2667 };
2668
2669 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb)
2670 {
2671         /* If skb_clear_hash() was called due to mangling, we can
2672          * trigger SW recalculation here. Later access to hash
2673          * can then use the inline skb->hash via context directly
2674          * instead of calling this helper again.
2675          */
2676         return skb_get_hash(skb);
2677 }
2678
2679 static const struct bpf_func_proto bpf_get_hash_recalc_proto = {
2680         .func           = bpf_get_hash_recalc,
2681         .gpl_only       = false,
2682         .ret_type       = RET_INTEGER,
2683         .arg1_type      = ARG_PTR_TO_CTX,
2684 };
2685
2686 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb)
2687 {
2688         /* After all direct packet write, this can be used once for
2689          * triggering a lazy recalc on next skb_get_hash() invocation.
2690          */
2691         skb_clear_hash(skb);
2692         return 0;
2693 }
2694
2695 static const struct bpf_func_proto bpf_set_hash_invalid_proto = {
2696         .func           = bpf_set_hash_invalid,
2697         .gpl_only       = false,
2698         .ret_type       = RET_INTEGER,
2699         .arg1_type      = ARG_PTR_TO_CTX,
2700 };
2701
2702 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash)
2703 {
2704         /* Set user specified hash as L4(+), so that it gets returned
2705          * on skb_get_hash() call unless BPF prog later on triggers a
2706          * skb_clear_hash().
2707          */
2708         __skb_set_sw_hash(skb, hash, true);
2709         return 0;
2710 }
2711
2712 static const struct bpf_func_proto bpf_set_hash_proto = {
2713         .func           = bpf_set_hash,
2714         .gpl_only       = false,
2715         .ret_type       = RET_INTEGER,
2716         .arg1_type      = ARG_PTR_TO_CTX,
2717         .arg2_type      = ARG_ANYTHING,
2718 };
2719
2720 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto,
2721            u16, vlan_tci)
2722 {
2723         int ret;
2724
2725         if (unlikely(vlan_proto != htons(ETH_P_8021Q) &&
2726                      vlan_proto != htons(ETH_P_8021AD)))
2727                 vlan_proto = htons(ETH_P_8021Q);
2728
2729         bpf_push_mac_rcsum(skb);
2730         ret = skb_vlan_push(skb, vlan_proto, vlan_tci);
2731         bpf_pull_mac_rcsum(skb);
2732
2733         bpf_compute_data_pointers(skb);
2734         return ret;
2735 }
2736
2737 static const struct bpf_func_proto bpf_skb_vlan_push_proto = {
2738         .func           = bpf_skb_vlan_push,
2739         .gpl_only       = false,
2740         .ret_type       = RET_INTEGER,
2741         .arg1_type      = ARG_PTR_TO_CTX,
2742         .arg2_type      = ARG_ANYTHING,
2743         .arg3_type      = ARG_ANYTHING,
2744 };
2745
2746 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb)
2747 {
2748         int ret;
2749
2750         bpf_push_mac_rcsum(skb);
2751         ret = skb_vlan_pop(skb);
2752         bpf_pull_mac_rcsum(skb);
2753
2754         bpf_compute_data_pointers(skb);
2755         return ret;
2756 }
2757
2758 static const struct bpf_func_proto bpf_skb_vlan_pop_proto = {
2759         .func           = bpf_skb_vlan_pop,
2760         .gpl_only       = false,
2761         .ret_type       = RET_INTEGER,
2762         .arg1_type      = ARG_PTR_TO_CTX,
2763 };
2764
2765 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len)
2766 {
2767         /* Caller already did skb_cow() with len as headroom,
2768          * so no need to do it here.
2769          */
2770         skb_push(skb, len);
2771         memmove(skb->data, skb->data + len, off);
2772         memset(skb->data + off, 0, len);
2773
2774         /* No skb_postpush_rcsum(skb, skb->data + off, len)
2775          * needed here as it does not change the skb->csum
2776          * result for checksum complete when summing over
2777          * zeroed blocks.
2778          */
2779         return 0;
2780 }
2781
2782 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len)
2783 {
2784         /* skb_ensure_writable() is not needed here, as we're
2785          * already working on an uncloned skb.
2786          */
2787         if (unlikely(!pskb_may_pull(skb, off + len)))
2788                 return -ENOMEM;
2789
2790         skb_postpull_rcsum(skb, skb->data + off, len);
2791         memmove(skb->data + len, skb->data, off);
2792         __skb_pull(skb, len);
2793
2794         return 0;
2795 }
2796
2797 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len)
2798 {
2799         bool trans_same = skb->transport_header == skb->network_header;
2800         int ret;
2801
2802         /* There's no need for __skb_push()/__skb_pull() pair to
2803          * get to the start of the mac header as we're guaranteed
2804          * to always start from here under eBPF.
2805          */
2806         ret = bpf_skb_generic_push(skb, off, len);
2807         if (likely(!ret)) {
2808                 skb->mac_header -= len;
2809                 skb->network_header -= len;
2810                 if (trans_same)
2811                         skb->transport_header = skb->network_header;
2812         }
2813
2814         return ret;
2815 }
2816
2817 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len)
2818 {
2819         bool trans_same = skb->transport_header == skb->network_header;
2820         int ret;
2821
2822         /* Same here, __skb_push()/__skb_pull() pair not needed. */
2823         ret = bpf_skb_generic_pop(skb, off, len);
2824         if (likely(!ret)) {
2825                 skb->mac_header += len;
2826                 skb->network_header += len;
2827                 if (trans_same)
2828                         skb->transport_header = skb->network_header;
2829         }
2830
2831         return ret;
2832 }
2833
2834 static int bpf_skb_proto_4_to_6(struct sk_buff *skb)
2835 {
2836         const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
2837         u32 off = skb_mac_header_len(skb);
2838         int ret;
2839
2840         if (skb_is_gso(skb) && !skb_is_gso_tcp(skb))
2841                 return -ENOTSUPP;
2842
2843         ret = skb_cow(skb, len_diff);
2844         if (unlikely(ret < 0))
2845                 return ret;
2846
2847         ret = bpf_skb_net_hdr_push(skb, off, len_diff);
2848         if (unlikely(ret < 0))
2849                 return ret;
2850
2851         if (skb_is_gso(skb)) {
2852                 struct skb_shared_info *shinfo = skb_shinfo(skb);
2853
2854                 /* SKB_GSO_TCPV4 needs to be changed into
2855                  * SKB_GSO_TCPV6.
2856                  */
2857                 if (shinfo->gso_type & SKB_GSO_TCPV4) {
2858                         shinfo->gso_type &= ~SKB_GSO_TCPV4;
2859                         shinfo->gso_type |=  SKB_GSO_TCPV6;
2860                 }
2861
2862                 /* Due to IPv6 header, MSS needs to be downgraded. */
2863                 skb_decrease_gso_size(shinfo, len_diff);
2864                 /* Header must be checked, and gso_segs recomputed. */
2865                 shinfo->gso_type |= SKB_GSO_DODGY;
2866                 shinfo->gso_segs = 0;
2867         }
2868
2869         skb->protocol = htons(ETH_P_IPV6);
2870         skb_clear_hash(skb);
2871
2872         return 0;
2873 }
2874
2875 static int bpf_skb_proto_6_to_4(struct sk_buff *skb)
2876 {
2877         const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
2878         u32 off = skb_mac_header_len(skb);
2879         int ret;
2880
2881         if (skb_is_gso(skb) && !skb_is_gso_tcp(skb))
2882                 return -ENOTSUPP;
2883
2884         ret = skb_unclone(skb, GFP_ATOMIC);
2885         if (unlikely(ret < 0))
2886                 return ret;
2887
2888         ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
2889         if (unlikely(ret < 0))
2890                 return ret;
2891
2892         if (skb_is_gso(skb)) {
2893                 struct skb_shared_info *shinfo = skb_shinfo(skb);
2894
2895                 /* SKB_GSO_TCPV6 needs to be changed into
2896                  * SKB_GSO_TCPV4.
2897                  */
2898                 if (shinfo->gso_type & SKB_GSO_TCPV6) {
2899                         shinfo->gso_type &= ~SKB_GSO_TCPV6;
2900                         shinfo->gso_type |=  SKB_GSO_TCPV4;
2901                 }
2902
2903                 /* Due to IPv4 header, MSS can be upgraded. */
2904                 skb_increase_gso_size(shinfo, len_diff);
2905                 /* Header must be checked, and gso_segs recomputed. */
2906                 shinfo->gso_type |= SKB_GSO_DODGY;
2907                 shinfo->gso_segs = 0;
2908         }
2909
2910         skb->protocol = htons(ETH_P_IP);
2911         skb_clear_hash(skb);
2912
2913         return 0;
2914 }
2915
2916 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto)
2917 {
2918         __be16 from_proto = skb->protocol;
2919
2920         if (from_proto == htons(ETH_P_IP) &&
2921               to_proto == htons(ETH_P_IPV6))
2922                 return bpf_skb_proto_4_to_6(skb);
2923
2924         if (from_proto == htons(ETH_P_IPV6) &&
2925               to_proto == htons(ETH_P_IP))
2926                 return bpf_skb_proto_6_to_4(skb);
2927
2928         return -ENOTSUPP;
2929 }
2930
2931 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto,
2932            u64, flags)
2933 {
2934         int ret;
2935
2936         if (unlikely(flags))
2937                 return -EINVAL;
2938
2939         /* General idea is that this helper does the basic groundwork
2940          * needed for changing the protocol, and eBPF program fills the
2941          * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace()
2942          * and other helpers, rather than passing a raw buffer here.
2943          *
2944          * The rationale is to keep this minimal and without a need to
2945          * deal with raw packet data. F.e. even if we would pass buffers
2946          * here, the program still needs to call the bpf_lX_csum_replace()
2947          * helpers anyway. Plus, this way we keep also separation of
2948          * concerns, since f.e. bpf_skb_store_bytes() should only take
2949          * care of stores.
2950          *
2951          * Currently, additional options and extension header space are
2952          * not supported, but flags register is reserved so we can adapt
2953          * that. For offloads, we mark packet as dodgy, so that headers
2954          * need to be verified first.
2955          */
2956         ret = bpf_skb_proto_xlat(skb, proto);
2957         bpf_compute_data_pointers(skb);
2958         return ret;
2959 }
2960
2961 static const struct bpf_func_proto bpf_skb_change_proto_proto = {
2962         .func           = bpf_skb_change_proto,
2963         .gpl_only       = false,
2964         .ret_type       = RET_INTEGER,
2965         .arg1_type      = ARG_PTR_TO_CTX,
2966         .arg2_type      = ARG_ANYTHING,
2967         .arg3_type      = ARG_ANYTHING,
2968 };
2969
2970 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type)
2971 {
2972         /* We only allow a restricted subset to be changed for now. */
2973         if (unlikely(!skb_pkt_type_ok(skb->pkt_type) ||
2974                      !skb_pkt_type_ok(pkt_type)))
2975                 return -EINVAL;
2976
2977         skb->pkt_type = pkt_type;
2978         return 0;
2979 }
2980
2981 static const struct bpf_func_proto bpf_skb_change_type_proto = {
2982         .func           = bpf_skb_change_type,
2983         .gpl_only       = false,
2984         .ret_type       = RET_INTEGER,
2985         .arg1_type      = ARG_PTR_TO_CTX,
2986         .arg2_type      = ARG_ANYTHING,
2987 };
2988
2989 static u32 bpf_skb_net_base_len(const struct sk_buff *skb)
2990 {
2991         switch (skb->protocol) {
2992         case htons(ETH_P_IP):
2993                 return sizeof(struct iphdr);
2994         case htons(ETH_P_IPV6):
2995                 return sizeof(struct ipv6hdr);
2996         default:
2997                 return ~0U;
2998         }
2999 }
3000
3001 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK    (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \
3002                                          BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3003
3004 #define BPF_F_ADJ_ROOM_MASK             (BPF_F_ADJ_ROOM_FIXED_GSO | \
3005                                          BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \
3006                                          BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \
3007                                          BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \
3008                                          BPF_F_ADJ_ROOM_ENCAP_L2( \
3009                                           BPF_ADJ_ROOM_ENCAP_L2_MASK))
3010
3011 static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff,
3012                             u64 flags)
3013 {
3014         u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT;
3015         bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK;
3016         u16 mac_len = 0, inner_net = 0, inner_trans = 0;
3017         unsigned int gso_type = SKB_GSO_DODGY;
3018         int ret;
3019
3020         if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) {
3021                 /* udp gso_size delineates datagrams, only allow if fixed */
3022                 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) ||
3023                     !(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3024                         return -ENOTSUPP;
3025         }
3026
3027         ret = skb_cow_head(skb, len_diff);
3028         if (unlikely(ret < 0))
3029                 return ret;
3030
3031         if (encap) {
3032                 if (skb->protocol != htons(ETH_P_IP) &&
3033                     skb->protocol != htons(ETH_P_IPV6))
3034                         return -ENOTSUPP;
3035
3036                 if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 &&
3037                     flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3038                         return -EINVAL;
3039
3040                 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE &&
3041                     flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP)
3042                         return -EINVAL;
3043
3044                 if (skb->encapsulation)
3045                         return -EALREADY;
3046
3047                 mac_len = skb->network_header - skb->mac_header;
3048                 inner_net = skb->network_header;
3049                 if (inner_mac_len > len_diff)
3050                         return -EINVAL;
3051                 inner_trans = skb->transport_header;
3052         }
3053
3054         ret = bpf_skb_net_hdr_push(skb, off, len_diff);
3055         if (unlikely(ret < 0))
3056                 return ret;
3057
3058         if (encap) {
3059                 skb->inner_mac_header = inner_net - inner_mac_len;
3060                 skb->inner_network_header = inner_net;
3061                 skb->inner_transport_header = inner_trans;
3062                 skb_set_inner_protocol(skb, skb->protocol);
3063
3064                 skb->encapsulation = 1;
3065                 skb_set_network_header(skb, mac_len);
3066
3067                 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP)
3068                         gso_type |= SKB_GSO_UDP_TUNNEL;
3069                 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE)
3070                         gso_type |= SKB_GSO_GRE;
3071                 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3072                         gso_type |= SKB_GSO_IPXIP6;
3073                 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4)
3074                         gso_type |= SKB_GSO_IPXIP4;
3075
3076                 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE ||
3077                     flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) {
3078                         int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ?
3079                                         sizeof(struct ipv6hdr) :
3080                                         sizeof(struct iphdr);
3081
3082                         skb_set_transport_header(skb, mac_len + nh_len);
3083                 }
3084
3085                 /* Match skb->protocol to new outer l3 protocol */
3086                 if (skb->protocol == htons(ETH_P_IP) &&
3087                     flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3088                         skb->protocol = htons(ETH_P_IPV6);
3089                 else if (skb->protocol == htons(ETH_P_IPV6) &&
3090                          flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4)
3091                         skb->protocol = htons(ETH_P_IP);
3092         }
3093
3094         if (skb_is_gso(skb)) {
3095                 struct skb_shared_info *shinfo = skb_shinfo(skb);
3096
3097                 /* Due to header grow, MSS needs to be downgraded. */
3098                 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3099                         skb_decrease_gso_size(shinfo, len_diff);
3100
3101                 /* Header must be checked, and gso_segs recomputed. */
3102                 shinfo->gso_type |= gso_type;
3103                 shinfo->gso_segs = 0;
3104         }
3105
3106         return 0;
3107 }
3108
3109 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff,
3110                               u64 flags)
3111 {
3112         int ret;
3113
3114         if (flags & ~BPF_F_ADJ_ROOM_FIXED_GSO)
3115                 return -EINVAL;
3116
3117         if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) {
3118                 /* udp gso_size delineates datagrams, only allow if fixed */
3119                 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) ||
3120                     !(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3121                         return -ENOTSUPP;
3122         }
3123
3124         ret = skb_unclone(skb, GFP_ATOMIC);
3125         if (unlikely(ret < 0))
3126                 return ret;
3127
3128         ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
3129         if (unlikely(ret < 0))
3130                 return ret;
3131
3132         if (skb_is_gso(skb)) {
3133                 struct skb_shared_info *shinfo = skb_shinfo(skb);
3134
3135                 /* Due to header shrink, MSS can be upgraded. */
3136                 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3137                         skb_increase_gso_size(shinfo, len_diff);
3138
3139                 /* Header must be checked, and gso_segs recomputed. */
3140                 shinfo->gso_type |= SKB_GSO_DODGY;
3141                 shinfo->gso_segs = 0;
3142         }
3143
3144         return 0;
3145 }
3146
3147 static u32 __bpf_skb_max_len(const struct sk_buff *skb)
3148 {
3149         return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len :
3150                           SKB_MAX_ALLOC;
3151 }
3152
3153 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
3154            u32, mode, u64, flags)
3155 {
3156         u32 len_cur, len_diff_abs = abs(len_diff);
3157         u32 len_min = bpf_skb_net_base_len(skb);
3158         u32 len_max = __bpf_skb_max_len(skb);
3159         __be16 proto = skb->protocol;
3160         bool shrink = len_diff < 0;
3161         u32 off;
3162         int ret;
3163
3164         if (unlikely(flags & ~BPF_F_ADJ_ROOM_MASK))
3165                 return -EINVAL;
3166         if (unlikely(len_diff_abs > 0xfffU))
3167                 return -EFAULT;
3168         if (unlikely(proto != htons(ETH_P_IP) &&
3169                      proto != htons(ETH_P_IPV6)))
3170                 return -ENOTSUPP;
3171
3172         off = skb_mac_header_len(skb);
3173         switch (mode) {
3174         case BPF_ADJ_ROOM_NET:
3175                 off += bpf_skb_net_base_len(skb);
3176                 break;
3177         case BPF_ADJ_ROOM_MAC:
3178                 break;
3179         default:
3180                 return -ENOTSUPP;
3181         }
3182
3183         len_cur = skb->len - skb_network_offset(skb);
3184         if ((shrink && (len_diff_abs >= len_cur ||
3185                         len_cur - len_diff_abs < len_min)) ||
3186             (!shrink && (skb->len + len_diff_abs > len_max &&
3187                          !skb_is_gso(skb))))
3188                 return -ENOTSUPP;
3189
3190         ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) :
3191                        bpf_skb_net_grow(skb, off, len_diff_abs, flags);
3192
3193         bpf_compute_data_pointers(skb);
3194         return ret;
3195 }
3196
3197 static const struct bpf_func_proto bpf_skb_adjust_room_proto = {
3198         .func           = bpf_skb_adjust_room,
3199         .gpl_only       = false,
3200         .ret_type       = RET_INTEGER,
3201         .arg1_type      = ARG_PTR_TO_CTX,
3202         .arg2_type      = ARG_ANYTHING,
3203         .arg3_type      = ARG_ANYTHING,
3204         .arg4_type      = ARG_ANYTHING,
3205 };
3206
3207 static u32 __bpf_skb_min_len(const struct sk_buff *skb)
3208 {
3209         u32 min_len = skb_network_offset(skb);
3210
3211         if (skb_transport_header_was_set(skb))
3212                 min_len = skb_transport_offset(skb);
3213         if (skb->ip_summed == CHECKSUM_PARTIAL)
3214                 min_len = skb_checksum_start_offset(skb) +
3215                           skb->csum_offset + sizeof(__sum16);
3216         return min_len;
3217 }
3218
3219 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len)
3220 {
3221         unsigned int old_len = skb->len;
3222         int ret;
3223
3224         ret = __skb_grow_rcsum(skb, new_len);
3225         if (!ret)
3226                 memset(skb->data + old_len, 0, new_len - old_len);
3227         return ret;
3228 }
3229
3230 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len)
3231 {
3232         return __skb_trim_rcsum(skb, new_len);
3233 }
3234
3235 static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len,
3236                                         u64 flags)
3237 {
3238         u32 max_len = __bpf_skb_max_len(skb);
3239         u32 min_len = __bpf_skb_min_len(skb);
3240         int ret;
3241
3242         if (unlikely(flags || new_len > max_len || new_len < min_len))
3243                 return -EINVAL;
3244         if (skb->encapsulation)
3245                 return -ENOTSUPP;
3246
3247         /* The basic idea of this helper is that it's performing the
3248          * needed work to either grow or trim an skb, and eBPF program
3249          * rewrites the rest via helpers like bpf_skb_store_bytes(),
3250          * bpf_lX_csum_replace() and others rather than passing a raw
3251          * buffer here. This one is a slow path helper and intended
3252          * for replies with control messages.
3253          *
3254          * Like in bpf_skb_change_proto(), we want to keep this rather
3255          * minimal and without protocol specifics so that we are able
3256          * to separate concerns as in bpf_skb_store_bytes() should only
3257          * be the one responsible for writing buffers.
3258          *
3259          * It's really expected to be a slow path operation here for
3260          * control message replies, so we're implicitly linearizing,
3261          * uncloning and drop offloads from the skb by this.
3262          */
3263         ret = __bpf_try_make_writable(skb, skb->len);
3264         if (!ret) {
3265                 if (new_len > skb->len)
3266                         ret = bpf_skb_grow_rcsum(skb, new_len);
3267                 else if (new_len < skb->len)
3268                         ret = bpf_skb_trim_rcsum(skb, new_len);
3269                 if (!ret && skb_is_gso(skb))
3270                         skb_gso_reset(skb);
3271         }
3272         return ret;
3273 }
3274
3275 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len,
3276            u64, flags)
3277 {
3278         int ret = __bpf_skb_change_tail(skb, new_len, flags);
3279
3280         bpf_compute_data_pointers(skb);
3281         return ret;
3282 }
3283
3284 static const struct bpf_func_proto bpf_skb_change_tail_proto = {
3285         .func           = bpf_skb_change_tail,
3286         .gpl_only       = false,
3287         .ret_type       = RET_INTEGER,
3288         .arg1_type      = ARG_PTR_TO_CTX,
3289         .arg2_type      = ARG_ANYTHING,
3290         .arg3_type      = ARG_ANYTHING,
3291 };
3292
3293 BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len,
3294            u64, flags)
3295 {
3296         int ret = __bpf_skb_change_tail(skb, new_len, flags);
3297
3298         bpf_compute_data_end_sk_skb(skb);
3299         return ret;
3300 }
3301
3302 static const struct bpf_func_proto sk_skb_change_tail_proto = {
3303         .func           = sk_skb_change_tail,
3304         .gpl_only       = false,
3305         .ret_type       = RET_INTEGER,
3306         .arg1_type      = ARG_PTR_TO_CTX,
3307         .arg2_type      = ARG_ANYTHING,
3308         .arg3_type      = ARG_ANYTHING,
3309 };
3310
3311 static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room,
3312                                         u64 flags)
3313 {
3314         u32 max_len = __bpf_skb_max_len(skb);
3315         u32 new_len = skb->len + head_room;
3316         int ret;
3317
3318         if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) ||
3319                      new_len < skb->len))
3320                 return -EINVAL;
3321
3322         ret = skb_cow(skb, head_room);
3323         if (likely(!ret)) {
3324                 /* Idea for this helper is that we currently only
3325                  * allow to expand on mac header. This means that
3326                  * skb->protocol network header, etc, stay as is.
3327                  * Compared to bpf_skb_change_tail(), we're more
3328                  * flexible due to not needing to linearize or
3329                  * reset GSO. Intention for this helper is to be
3330                  * used by an L3 skb that needs to push mac header
3331                  * for redirection into L2 device.
3332                  */
3333                 __skb_push(skb, head_room);
3334                 memset(skb->data, 0, head_room);
3335                 skb_reset_mac_header(skb);
3336         }
3337
3338         return ret;
3339 }
3340
3341 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room,
3342            u64, flags)
3343 {
3344         int ret = __bpf_skb_change_head(skb, head_room, flags);
3345
3346         bpf_compute_data_pointers(skb);
3347         return ret;
3348 }
3349
3350 static const struct bpf_func_proto bpf_skb_change_head_proto = {
3351         .func           = bpf_skb_change_head,
3352         .gpl_only       = false,
3353         .ret_type       = RET_INTEGER,
3354         .arg1_type      = ARG_PTR_TO_CTX,
3355         .arg2_type      = ARG_ANYTHING,
3356         .arg3_type      = ARG_ANYTHING,
3357 };
3358
3359 BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room,
3360            u64, flags)
3361 {
3362         int ret = __bpf_skb_change_head(skb, head_room, flags);
3363
3364         bpf_compute_data_end_sk_skb(skb);
3365         return ret;
3366 }
3367
3368 static const struct bpf_func_proto sk_skb_change_head_proto = {
3369         .func           = sk_skb_change_head,
3370         .gpl_only       = false,
3371         .ret_type       = RET_INTEGER,
3372         .arg1_type      = ARG_PTR_TO_CTX,
3373         .arg2_type      = ARG_ANYTHING,
3374         .arg3_type      = ARG_ANYTHING,
3375 };
3376 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp)
3377 {
3378         return xdp_data_meta_unsupported(xdp) ? 0 :
3379                xdp->data - xdp->data_meta;
3380 }
3381
3382 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset)
3383 {
3384         void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
3385         unsigned long metalen = xdp_get_metalen(xdp);
3386         void *data_start = xdp_frame_end + metalen;
3387         void *data = xdp->data + offset;
3388
3389         if (unlikely(data < data_start ||
3390                      data > xdp->data_end - ETH_HLEN))
3391                 return -EINVAL;
3392
3393         if (metalen)
3394                 memmove(xdp->data_meta + offset,
3395                         xdp->data_meta, metalen);
3396         xdp->data_meta += offset;
3397         xdp->data = data;
3398
3399         return 0;
3400 }
3401
3402 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = {
3403         .func           = bpf_xdp_adjust_head,
3404         .gpl_only       = false,
3405         .ret_type       = RET_INTEGER,
3406         .arg1_type      = ARG_PTR_TO_CTX,
3407         .arg2_type      = ARG_ANYTHING,
3408 };
3409
3410 BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset)
3411 {
3412         void *data_end = xdp->data_end + offset;
3413
3414         /* only shrinking is allowed for now. */
3415         if (unlikely(offset >= 0))
3416                 return -EINVAL;
3417
3418         if (unlikely(data_end < xdp->data + ETH_HLEN))
3419                 return -EINVAL;
3420
3421         xdp->data_end = data_end;
3422
3423         return 0;
3424 }
3425
3426 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = {
3427         .func           = bpf_xdp_adjust_tail,
3428         .gpl_only       = false,
3429         .ret_type       = RET_INTEGER,
3430         .arg1_type      = ARG_PTR_TO_CTX,
3431         .arg2_type      = ARG_ANYTHING,
3432 };
3433
3434 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset)
3435 {
3436         void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
3437         void *meta = xdp->data_meta + offset;
3438         unsigned long metalen = xdp->data - meta;
3439
3440         if (xdp_data_meta_unsupported(xdp))
3441                 return -ENOTSUPP;
3442         if (unlikely(meta < xdp_frame_end ||
3443                      meta > xdp->data))
3444                 return -EINVAL;
3445         if (unlikely((metalen & (sizeof(__u32) - 1)) ||
3446                      (metalen > 32)))
3447                 return -EACCES;
3448
3449         xdp->data_meta = meta;
3450
3451         return 0;
3452 }
3453
3454 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = {
3455         .func           = bpf_xdp_adjust_meta,
3456         .gpl_only       = false,
3457         .ret_type       = RET_INTEGER,
3458         .arg1_type      = ARG_PTR_TO_CTX,
3459         .arg2_type      = ARG_ANYTHING,
3460 };
3461
3462 static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
3463                             struct bpf_map *map, struct xdp_buff *xdp)
3464 {
3465         switch (map->map_type) {
3466         case BPF_MAP_TYPE_DEVMAP:
3467         case BPF_MAP_TYPE_DEVMAP_HASH:
3468                 return dev_map_enqueue(fwd, xdp, dev_rx);
3469         case BPF_MAP_TYPE_CPUMAP:
3470                 return cpu_map_enqueue(fwd, xdp, dev_rx);
3471         case BPF_MAP_TYPE_XSKMAP:
3472                 return __xsk_map_redirect(fwd, xdp);
3473         default:
3474                 return -EBADRQC;
3475         }
3476         return 0;
3477 }
3478
3479 void xdp_do_flush(void)
3480 {
3481         __dev_flush();
3482         __cpu_map_flush();
3483         __xsk_map_flush();
3484 }
3485 EXPORT_SYMBOL_GPL(xdp_do_flush);
3486
3487 static inline void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index)
3488 {
3489         switch (map->map_type) {
3490         case BPF_MAP_TYPE_DEVMAP:
3491                 return __dev_map_lookup_elem(map, index);
3492         case BPF_MAP_TYPE_DEVMAP_HASH:
3493                 return __dev_map_hash_lookup_elem(map, index);
3494         case BPF_MAP_TYPE_CPUMAP:
3495                 return __cpu_map_lookup_elem(map, index);
3496         case BPF_MAP_TYPE_XSKMAP:
3497                 return __xsk_map_lookup_elem(map, index);
3498         default:
3499                 return NULL;
3500         }
3501 }
3502
3503 void bpf_clear_redirect_map(struct bpf_map *map)
3504 {
3505         struct bpf_redirect_info *ri;
3506         int cpu;
3507
3508         for_each_possible_cpu(cpu) {
3509                 ri = per_cpu_ptr(&bpf_redirect_info, cpu);
3510                 /* Avoid polluting remote cacheline due to writes if
3511                  * not needed. Once we pass this test, we need the
3512                  * cmpxchg() to make sure it hasn't been changed in
3513                  * the meantime by remote CPU.
3514                  */
3515                 if (unlikely(READ_ONCE(ri->map) == map))
3516                         cmpxchg(&ri->map, map, NULL);
3517         }
3518 }
3519
3520 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
3521                     struct bpf_prog *xdp_prog)
3522 {
3523         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
3524         struct bpf_map *map = READ_ONCE(ri->map);
3525         u32 index = ri->tgt_index;
3526         void *fwd = ri->tgt_value;
3527         int err;
3528
3529         ri->tgt_index = 0;
3530         ri->tgt_value = NULL;
3531         WRITE_ONCE(ri->map, NULL);
3532
3533         if (unlikely(!map)) {
3534                 fwd = dev_get_by_index_rcu(dev_net(dev), index);
3535                 if (unlikely(!fwd)) {
3536                         err = -EINVAL;
3537                         goto err;
3538                 }
3539
3540                 err = dev_xdp_enqueue(fwd, xdp, dev);
3541         } else {
3542                 err = __bpf_tx_xdp_map(dev, fwd, map, xdp);
3543         }
3544
3545         if (unlikely(err))
3546                 goto err;
3547
3548         _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
3549         return 0;
3550 err:
3551         _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
3552         return err;
3553 }
3554 EXPORT_SYMBOL_GPL(xdp_do_redirect);
3555
3556 static int xdp_do_generic_redirect_map(struct net_device *dev,
3557                                        struct sk_buff *skb,
3558                                        struct xdp_buff *xdp,
3559                                        struct bpf_prog *xdp_prog,
3560                                        struct bpf_map *map)
3561 {
3562         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
3563         u32 index = ri->tgt_index;
3564         void *fwd = ri->tgt_value;
3565         int err = 0;
3566
3567         ri->tgt_index = 0;
3568         ri->tgt_value = NULL;
3569         WRITE_ONCE(ri->map, NULL);
3570
3571         if (map->map_type == BPF_MAP_TYPE_DEVMAP ||
3572             map->map_type == BPF_MAP_TYPE_DEVMAP_HASH) {
3573                 struct bpf_dtab_netdev *dst = fwd;
3574
3575                 err = dev_map_generic_redirect(dst, skb, xdp_prog);
3576                 if (unlikely(err))
3577                         goto err;
3578         } else if (map->map_type == BPF_MAP_TYPE_XSKMAP) {
3579                 struct xdp_sock *xs = fwd;
3580
3581                 err = xsk_generic_rcv(xs, xdp);
3582                 if (err)
3583                         goto err;
3584                 consume_skb(skb);
3585         } else {
3586                 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */
3587                 err = -EBADRQC;
3588                 goto err;
3589         }
3590
3591         _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
3592         return 0;
3593 err:
3594         _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
3595         return err;
3596 }
3597
3598 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
3599                             struct xdp_buff *xdp, struct bpf_prog *xdp_prog)
3600 {
3601         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
3602         struct bpf_map *map = READ_ONCE(ri->map);
3603         u32 index = ri->tgt_index;
3604         struct net_device *fwd;
3605         int err = 0;
3606
3607         if (map)
3608                 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog,
3609                                                    map);
3610         ri->tgt_index = 0;
3611         fwd = dev_get_by_index_rcu(dev_net(dev), index);
3612         if (unlikely(!fwd)) {
3613                 err = -EINVAL;
3614                 goto err;
3615         }
3616
3617         err = xdp_ok_fwd_dev(fwd, skb->len);
3618         if (unlikely(err))
3619                 goto err;
3620
3621         skb->dev = fwd;
3622         _trace_xdp_redirect(dev, xdp_prog, index);
3623         generic_xdp_tx(skb, xdp_prog);
3624         return 0;
3625 err:
3626         _trace_xdp_redirect_err(dev, xdp_prog, index, err);
3627         return err;
3628 }
3629 EXPORT_SYMBOL_GPL(xdp_do_generic_redirect);
3630
3631 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags)
3632 {
3633         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
3634
3635         if (unlikely(flags))
3636                 return XDP_ABORTED;
3637
3638         ri->flags = flags;
3639         ri->tgt_index = ifindex;
3640         ri->tgt_value = NULL;
3641         WRITE_ONCE(ri->map, NULL);
3642
3643         return XDP_REDIRECT;
3644 }
3645
3646 static const struct bpf_func_proto bpf_xdp_redirect_proto = {
3647         .func           = bpf_xdp_redirect,
3648         .gpl_only       = false,
3649         .ret_type       = RET_INTEGER,
3650         .arg1_type      = ARG_ANYTHING,
3651         .arg2_type      = ARG_ANYTHING,
3652 };
3653
3654 BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex,
3655            u64, flags)
3656 {
3657         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
3658
3659         /* Lower bits of the flags are used as return code on lookup failure */
3660         if (unlikely(flags > XDP_TX))
3661                 return XDP_ABORTED;
3662
3663         ri->tgt_value = __xdp_map_lookup_elem(map, ifindex);
3664         if (unlikely(!ri->tgt_value)) {
3665                 /* If the lookup fails we want to clear out the state in the
3666                  * redirect_info struct completely, so that if an eBPF program
3667                  * performs multiple lookups, the last one always takes
3668                  * precedence.
3669                  */
3670                 WRITE_ONCE(ri->map, NULL);
3671                 return flags;
3672         }
3673
3674         ri->flags = flags;
3675         ri->tgt_index = ifindex;
3676         WRITE_ONCE(ri->map, map);
3677
3678         return XDP_REDIRECT;
3679 }
3680
3681 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = {
3682         .func           = bpf_xdp_redirect_map,
3683         .gpl_only       = false,
3684         .ret_type       = RET_INTEGER,
3685         .arg1_type      = ARG_CONST_MAP_PTR,
3686         .arg2_type      = ARG_ANYTHING,
3687         .arg3_type      = ARG_ANYTHING,
3688 };
3689
3690 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb,
3691                                   unsigned long off, unsigned long len)
3692 {
3693         void *ptr = skb_header_pointer(skb, off, len, dst_buff);
3694
3695         if (unlikely(!ptr))
3696                 return len;
3697         if (ptr != dst_buff)
3698                 memcpy(dst_buff, ptr, len);
3699
3700         return 0;
3701 }
3702
3703 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map,
3704            u64, flags, void *, meta, u64, meta_size)
3705 {
3706         u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
3707
3708         if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
3709                 return -EINVAL;
3710         if (unlikely(!skb || skb_size > skb->len))
3711                 return -EFAULT;
3712
3713         return bpf_event_output(map, flags, meta, meta_size, skb, skb_size,
3714                                 bpf_skb_copy);
3715 }
3716
3717 static const struct bpf_func_proto bpf_skb_event_output_proto = {
3718         .func           = bpf_skb_event_output,
3719         .gpl_only       = true,
3720         .ret_type       = RET_INTEGER,
3721         .arg1_type      = ARG_PTR_TO_CTX,
3722         .arg2_type      = ARG_CONST_MAP_PTR,
3723         .arg3_type      = ARG_ANYTHING,
3724         .arg4_type      = ARG_PTR_TO_MEM,
3725         .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
3726 };
3727
3728 static int bpf_skb_output_btf_ids[5];
3729 const struct bpf_func_proto bpf_skb_output_proto = {
3730         .func           = bpf_skb_event_output,
3731         .gpl_only       = true,
3732         .ret_type       = RET_INTEGER,
3733         .arg1_type      = ARG_PTR_TO_BTF_ID,
3734         .arg2_type      = ARG_CONST_MAP_PTR,
3735         .arg3_type      = ARG_ANYTHING,
3736         .arg4_type      = ARG_PTR_TO_MEM,
3737         .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
3738         .btf_id         = bpf_skb_output_btf_ids,
3739 };
3740
3741 static unsigned short bpf_tunnel_key_af(u64 flags)
3742 {
3743         return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET;
3744 }
3745
3746 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to,
3747            u32, size, u64, flags)
3748 {
3749         const struct ip_tunnel_info *info = skb_tunnel_info(skb);
3750         u8 compat[sizeof(struct bpf_tunnel_key)];
3751         void *to_orig = to;
3752         int err;
3753
3754         if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) {
3755                 err = -EINVAL;
3756                 goto err_clear;
3757         }
3758         if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) {
3759                 err = -EPROTO;
3760                 goto err_clear;
3761         }
3762         if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
3763                 err = -EINVAL;
3764                 switch (size) {
3765                 case offsetof(struct bpf_tunnel_key, tunnel_label):
3766                 case offsetof(struct bpf_tunnel_key, tunnel_ext):
3767                         goto set_compat;
3768                 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
3769                         /* Fixup deprecated structure layouts here, so we have
3770                          * a common path later on.
3771                          */
3772                         if (ip_tunnel_info_af(info) != AF_INET)
3773                                 goto err_clear;
3774 set_compat:
3775                         to = (struct bpf_tunnel_key *)compat;
3776                         break;
3777                 default:
3778                         goto err_clear;
3779                 }
3780         }
3781
3782         to->tunnel_id = be64_to_cpu(info->key.tun_id);
3783         to->tunnel_tos = info->key.tos;
3784         to->tunnel_ttl = info->key.ttl;
3785         to->tunnel_ext = 0;
3786
3787         if (flags & BPF_F_TUNINFO_IPV6) {
3788                 memcpy(to->remote_ipv6, &info->key.u.ipv6.src,
3789                        sizeof(to->remote_ipv6));
3790                 to->tunnel_label = be32_to_cpu(info->key.label);
3791         } else {
3792                 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
3793                 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
3794                 to->tunnel_label = 0;
3795         }
3796
3797         if (unlikely(size != sizeof(struct bpf_tunnel_key)))
3798                 memcpy(to_orig, to, size);
3799
3800         return 0;
3801 err_clear:
3802         memset(to_orig, 0, size);
3803         return err;
3804 }
3805
3806 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = {
3807         .func           = bpf_skb_get_tunnel_key,
3808         .gpl_only       = false,
3809         .ret_type       = RET_INTEGER,
3810         .arg1_type      = ARG_PTR_TO_CTX,
3811         .arg2_type      = ARG_PTR_TO_UNINIT_MEM,
3812         .arg3_type      = ARG_CONST_SIZE,
3813         .arg4_type      = ARG_ANYTHING,
3814 };
3815
3816 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size)
3817 {
3818         const struct ip_tunnel_info *info = skb_tunnel_info(skb);
3819         int err;
3820
3821         if (unlikely(!info ||
3822                      !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) {
3823                 err = -ENOENT;
3824                 goto err_clear;
3825         }
3826         if (unlikely(size < info->options_len)) {
3827                 err = -ENOMEM;
3828                 goto err_clear;
3829         }
3830
3831         ip_tunnel_info_opts_get(to, info);
3832         if (size > info->options_len)
3833                 memset(to + info->options_len, 0, size - info->options_len);
3834
3835         return info->options_len;
3836 err_clear:
3837         memset(to, 0, size);
3838         return err;
3839 }
3840
3841 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = {
3842         .func           = bpf_skb_get_tunnel_opt,
3843         .gpl_only       = false,
3844         .ret_type       = RET_INTEGER,
3845         .arg1_type      = ARG_PTR_TO_CTX,
3846         .arg2_type      = ARG_PTR_TO_UNINIT_MEM,
3847         .arg3_type      = ARG_CONST_SIZE,
3848 };
3849
3850 static struct metadata_dst __percpu *md_dst;
3851
3852 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
3853            const struct bpf_tunnel_key *, from, u32, size, u64, flags)
3854 {
3855         struct metadata_dst *md = this_cpu_ptr(md_dst);
3856         u8 compat[sizeof(struct bpf_tunnel_key)];
3857         struct ip_tunnel_info *info;
3858
3859         if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
3860                                BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER)))
3861                 return -EINVAL;
3862         if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
3863                 switch (size) {
3864                 case offsetof(struct bpf_tunnel_key, tunnel_label):
3865                 case offsetof(struct bpf_tunnel_key, tunnel_ext):
3866                 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
3867                         /* Fixup deprecated structure layouts here, so we have
3868                          * a common path later on.
3869                          */
3870                         memcpy(compat, from, size);
3871                         memset(compat + size, 0, sizeof(compat) - size);
3872                         from = (const struct bpf_tunnel_key *) compat;
3873                         break;
3874                 default:
3875                         return -EINVAL;
3876                 }
3877         }
3878         if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) ||
3879                      from->tunnel_ext))
3880                 return -EINVAL;
3881
3882         skb_dst_drop(skb);
3883         dst_hold((struct dst_entry *) md);
3884         skb_dst_set(skb, (struct dst_entry *) md);
3885
3886         info = &md->u.tun_info;
3887         memset(info, 0, sizeof(*info));
3888         info->mode = IP_TUNNEL_INFO_TX;
3889
3890         info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
3891         if (flags & BPF_F_DONT_FRAGMENT)
3892                 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT;
3893         if (flags & BPF_F_ZERO_CSUM_TX)
3894                 info->key.tun_flags &= ~TUNNEL_CSUM;
3895         if (flags & BPF_F_SEQ_NUMBER)
3896                 info->key.tun_flags |= TUNNEL_SEQ;
3897
3898         info->key.tun_id = cpu_to_be64(from->tunnel_id);
3899         info->key.tos = from->tunnel_tos;
3900         info->key.ttl = from->tunnel_ttl;
3901
3902         if (flags & BPF_F_TUNINFO_IPV6) {
3903                 info->mode |= IP_TUNNEL_INFO_IPV6;
3904                 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6,
3905                        sizeof(from->remote_ipv6));
3906                 info->key.label = cpu_to_be32(from->tunnel_label) &
3907                                   IPV6_FLOWLABEL_MASK;
3908         } else {
3909                 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
3910         }
3911
3912         return 0;
3913 }
3914
3915 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = {
3916         .func           = bpf_skb_set_tunnel_key,
3917         .gpl_only       = false,
3918         .ret_type       = RET_INTEGER,
3919         .arg1_type      = ARG_PTR_TO_CTX,
3920         .arg2_type      = ARG_PTR_TO_MEM,
3921         .arg3_type      = ARG_CONST_SIZE,
3922         .arg4_type      = ARG_ANYTHING,
3923 };
3924
3925 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb,
3926            const u8 *, from, u32, size)
3927 {
3928         struct ip_tunnel_info *info = skb_tunnel_info(skb);
3929         const struct metadata_dst *md = this_cpu_ptr(md_dst);
3930
3931         if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1))))
3932                 return -EINVAL;
3933         if (unlikely(size > IP_TUNNEL_OPTS_MAX))
3934                 return -ENOMEM;
3935
3936         ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT);
3937
3938         return 0;
3939 }
3940
3941 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = {
3942         .func           = bpf_skb_set_tunnel_opt,
3943         .gpl_only       = false,
3944         .ret_type       = RET_INTEGER,
3945         .arg1_type      = ARG_PTR_TO_CTX,
3946         .arg2_type      = ARG_PTR_TO_MEM,
3947         .arg3_type      = ARG_CONST_SIZE,
3948 };
3949
3950 static const struct bpf_func_proto *
3951 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which)
3952 {
3953         if (!md_dst) {
3954                 struct metadata_dst __percpu *tmp;
3955
3956                 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX,
3957                                                 METADATA_IP_TUNNEL,
3958                                                 GFP_KERNEL);
3959                 if (!tmp)
3960                         return NULL;
3961                 if (cmpxchg(&md_dst, NULL, tmp))
3962                         metadata_dst_free_percpu(tmp);
3963         }
3964
3965         switch (which) {
3966         case BPF_FUNC_skb_set_tunnel_key:
3967                 return &bpf_skb_set_tunnel_key_proto;
3968         case BPF_FUNC_skb_set_tunnel_opt:
3969                 return &bpf_skb_set_tunnel_opt_proto;
3970         default:
3971                 return NULL;
3972         }
3973 }
3974
3975 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map,
3976            u32, idx)
3977 {
3978         struct bpf_array *array = container_of(map, struct bpf_array, map);
3979         struct cgroup *cgrp;
3980         struct sock *sk;
3981
3982         sk = skb_to_full_sk(skb);
3983         if (!sk || !sk_fullsock(sk))
3984                 return -ENOENT;
3985         if (unlikely(idx >= array->map.max_entries))
3986                 return -E2BIG;
3987
3988         cgrp = READ_ONCE(array->ptrs[idx]);
3989         if (unlikely(!cgrp))
3990                 return -EAGAIN;
3991
3992         return sk_under_cgroup_hierarchy(sk, cgrp);
3993 }
3994
3995 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = {
3996         .func           = bpf_skb_under_cgroup,
3997         .gpl_only       = false,
3998         .ret_type       = RET_INTEGER,
3999         .arg1_type      = ARG_PTR_TO_CTX,
4000         .arg2_type      = ARG_CONST_MAP_PTR,
4001         .arg3_type      = ARG_ANYTHING,
4002 };
4003
4004 #ifdef CONFIG_SOCK_CGROUP_DATA
4005 BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb)
4006 {
4007         struct sock *sk = skb_to_full_sk(skb);
4008         struct cgroup *cgrp;
4009
4010         if (!sk || !sk_fullsock(sk))
4011                 return 0;
4012
4013         cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
4014         return cgroup_id(cgrp);
4015 }
4016
4017 static const struct bpf_func_proto bpf_skb_cgroup_id_proto = {
4018         .func           = bpf_skb_cgroup_id,
4019         .gpl_only       = false,
4020         .ret_type       = RET_INTEGER,
4021         .arg1_type      = ARG_PTR_TO_CTX,
4022 };
4023
4024 BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int,
4025            ancestor_level)
4026 {
4027         struct sock *sk = skb_to_full_sk(skb);
4028         struct cgroup *ancestor;
4029         struct cgroup *cgrp;
4030
4031         if (!sk || !sk_fullsock(sk))
4032                 return 0;
4033
4034         cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
4035         ancestor = cgroup_ancestor(cgrp, ancestor_level);
4036         if (!ancestor)
4037                 return 0;
4038
4039         return cgroup_id(ancestor);
4040 }
4041
4042 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = {
4043         .func           = bpf_skb_ancestor_cgroup_id,
4044         .gpl_only       = false,
4045         .ret_type       = RET_INTEGER,
4046         .arg1_type      = ARG_PTR_TO_CTX,
4047         .arg2_type      = ARG_ANYTHING,
4048 };
4049 #endif
4050
4051 static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff,
4052                                   unsigned long off, unsigned long len)
4053 {
4054         memcpy(dst_buff, src_buff + off, len);
4055         return 0;
4056 }
4057
4058 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map,
4059            u64, flags, void *, meta, u64, meta_size)
4060 {
4061         u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
4062
4063         if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
4064                 return -EINVAL;
4065         if (unlikely(xdp_size > (unsigned long)(xdp->data_end - xdp->data)))
4066                 return -EFAULT;
4067
4068         return bpf_event_output(map, flags, meta, meta_size, xdp->data,
4069                                 xdp_size, bpf_xdp_copy);
4070 }
4071
4072 static const struct bpf_func_proto bpf_xdp_event_output_proto = {
4073         .func           = bpf_xdp_event_output,
4074         .gpl_only       = true,
4075         .ret_type       = RET_INTEGER,
4076         .arg1_type      = ARG_PTR_TO_CTX,
4077         .arg2_type      = ARG_CONST_MAP_PTR,
4078         .arg3_type      = ARG_ANYTHING,
4079         .arg4_type      = ARG_PTR_TO_MEM,
4080         .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
4081 };
4082
4083 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb)
4084 {
4085         return skb->sk ? sock_gen_cookie(skb->sk) : 0;
4086 }
4087
4088 static const struct bpf_func_proto bpf_get_socket_cookie_proto = {
4089         .func           = bpf_get_socket_cookie,
4090         .gpl_only       = false,
4091         .ret_type       = RET_INTEGER,
4092         .arg1_type      = ARG_PTR_TO_CTX,
4093 };
4094
4095 BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx)
4096 {
4097         return sock_gen_cookie(ctx->sk);
4098 }
4099
4100 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = {
4101         .func           = bpf_get_socket_cookie_sock_addr,
4102         .gpl_only       = false,
4103         .ret_type       = RET_INTEGER,
4104         .arg1_type      = ARG_PTR_TO_CTX,
4105 };
4106
4107 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx)
4108 {
4109         return sock_gen_cookie(ctx->sk);
4110 }
4111
4112 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = {
4113         .func           = bpf_get_socket_cookie_sock_ops,
4114         .gpl_only       = false,
4115         .ret_type       = RET_INTEGER,
4116         .arg1_type      = ARG_PTR_TO_CTX,
4117 };
4118
4119 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
4120 {
4121         struct sock *sk = sk_to_full_sk(skb->sk);
4122         kuid_t kuid;
4123
4124         if (!sk || !sk_fullsock(sk))
4125                 return overflowuid;
4126         kuid = sock_net_uid(sock_net(sk), sk);
4127         return from_kuid_munged(sock_net(sk)->user_ns, kuid);
4128 }
4129
4130 static const struct bpf_func_proto bpf_get_socket_uid_proto = {
4131         .func           = bpf_get_socket_uid,
4132         .gpl_only       = false,
4133         .ret_type       = RET_INTEGER,
4134         .arg1_type      = ARG_PTR_TO_CTX,
4135 };
4136
4137 BPF_CALL_5(bpf_sockopt_event_output, struct bpf_sock_ops_kern *, bpf_sock,
4138            struct bpf_map *, map, u64, flags, void *, data, u64, size)
4139 {
4140         if (unlikely(flags & ~(BPF_F_INDEX_MASK)))
4141                 return -EINVAL;
4142
4143         return bpf_event_output(map, flags, data, size, NULL, 0, NULL);
4144 }
4145
4146 static const struct bpf_func_proto bpf_sockopt_event_output_proto =  {
4147         .func           = bpf_sockopt_event_output,
4148         .gpl_only       = true,
4149         .ret_type       = RET_INTEGER,
4150         .arg1_type      = ARG_PTR_TO_CTX,
4151         .arg2_type      = ARG_CONST_MAP_PTR,
4152         .arg3_type      = ARG_ANYTHING,
4153         .arg4_type      = ARG_PTR_TO_MEM,
4154         .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
4155 };
4156
4157 BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
4158            int, level, int, optname, char *, optval, int, optlen)
4159 {
4160         struct sock *sk = bpf_sock->sk;
4161         int ret = 0;
4162         int val;
4163
4164         if (!sk_fullsock(sk))
4165                 return -EINVAL;
4166
4167         if (level == SOL_SOCKET) {
4168                 if (optlen != sizeof(int))
4169                         return -EINVAL;
4170                 val = *((int *)optval);
4171
4172                 /* Only some socketops are supported */
4173                 switch (optname) {
4174                 case SO_RCVBUF:
4175                         val = min_t(u32, val, sysctl_rmem_max);
4176                         sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
4177                         WRITE_ONCE(sk->sk_rcvbuf,
4178                                    max_t(int, val * 2, SOCK_MIN_RCVBUF));
4179                         break;
4180                 case SO_SNDBUF:
4181                         val = min_t(u32, val, sysctl_wmem_max);
4182                         sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
4183                         WRITE_ONCE(sk->sk_sndbuf,
4184                                    max_t(int, val * 2, SOCK_MIN_SNDBUF));
4185                         break;
4186                 case SO_MAX_PACING_RATE: /* 32bit version */
4187                         if (val != ~0U)
4188                                 cmpxchg(&sk->sk_pacing_status,
4189                                         SK_PACING_NONE,
4190                                         SK_PACING_NEEDED);
4191                         sk->sk_max_pacing_rate = (val == ~0U) ? ~0UL : val;
4192                         sk->sk_pacing_rate = min(sk->sk_pacing_rate,
4193                                                  sk->sk_max_pacing_rate);
4194                         break;
4195                 case SO_PRIORITY:
4196                         sk->sk_priority = val;
4197                         break;
4198                 case SO_RCVLOWAT:
4199                         if (val < 0)
4200                                 val = INT_MAX;
4201                         WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
4202                         break;
4203                 case SO_MARK:
4204                         if (sk->sk_mark != val) {
4205                                 sk->sk_mark = val;
4206                                 sk_dst_reset(sk);
4207                         }
4208                         break;
4209                 default:
4210                         ret = -EINVAL;
4211                 }
4212 #ifdef CONFIG_INET
4213         } else if (level == SOL_IP) {
4214                 if (optlen != sizeof(int) || sk->sk_family != AF_INET)
4215                         return -EINVAL;
4216
4217                 val = *((int *)optval);
4218                 /* Only some options are supported */
4219                 switch (optname) {
4220                 case IP_TOS:
4221                         if (val < -1 || val > 0xff) {
4222                                 ret = -EINVAL;
4223                         } else {
4224                                 struct inet_sock *inet = inet_sk(sk);
4225
4226                                 if (val == -1)
4227                                         val = 0;
4228                                 inet->tos = val;
4229                         }
4230                         break;
4231                 default:
4232                         ret = -EINVAL;
4233                 }
4234 #if IS_ENABLED(CONFIG_IPV6)
4235         } else if (level == SOL_IPV6) {
4236                 if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
4237                         return -EINVAL;
4238
4239                 val = *((int *)optval);
4240                 /* Only some options are supported */
4241                 switch (optname) {
4242                 case IPV6_TCLASS:
4243                         if (val < -1 || val > 0xff) {
4244                                 ret = -EINVAL;
4245                         } else {
4246                                 struct ipv6_pinfo *np = inet6_sk(sk);
4247
4248                                 if (val == -1)
4249                                         val = 0;
4250                                 np->tclass = val;
4251                         }
4252                         break;
4253                 default:
4254                         ret = -EINVAL;
4255                 }
4256 #endif
4257         } else if (level == SOL_TCP &&
4258                    sk->sk_prot->setsockopt == tcp_setsockopt) {
4259                 if (optname == TCP_CONGESTION) {
4260                         char name[TCP_CA_NAME_MAX];
4261                         bool reinit = bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN;
4262
4263                         strncpy(name, optval, min_t(long, optlen,
4264                                                     TCP_CA_NAME_MAX-1));
4265                         name[TCP_CA_NAME_MAX-1] = 0;
4266                         ret = tcp_set_congestion_control(sk, name, false,
4267                                                          reinit, true);
4268                 } else {
4269                         struct tcp_sock *tp = tcp_sk(sk);
4270
4271                         if (optlen != sizeof(int))
4272                                 return -EINVAL;
4273
4274                         val = *((int *)optval);
4275                         /* Only some options are supported */
4276                         switch (optname) {
4277                         case TCP_BPF_IW:
4278                                 if (val <= 0 || tp->data_segs_out > tp->syn_data)
4279                                         ret = -EINVAL;
4280                                 else
4281                                         tp->snd_cwnd = val;
4282                                 break;
4283                         case TCP_BPF_SNDCWND_CLAMP:
4284                                 if (val <= 0) {
4285                                         ret = -EINVAL;
4286                                 } else {
4287                                         tp->snd_cwnd_clamp = val;
4288                                         tp->snd_ssthresh = val;
4289                                 }
4290                                 break;
4291                         case TCP_SAVE_SYN:
4292                                 if (val < 0 || val > 1)
4293                                         ret = -EINVAL;
4294                                 else
4295                                         tp->save_syn = val;
4296                                 break;
4297                         default:
4298                                 ret = -EINVAL;
4299                         }
4300                 }
4301 #endif
4302         } else {
4303                 ret = -EINVAL;
4304         }
4305         return ret;
4306 }
4307
4308 static const struct bpf_func_proto bpf_setsockopt_proto = {
4309         .func           = bpf_setsockopt,
4310         .gpl_only       = false,
4311         .ret_type       = RET_INTEGER,
4312         .arg1_type      = ARG_PTR_TO_CTX,
4313         .arg2_type      = ARG_ANYTHING,
4314         .arg3_type      = ARG_ANYTHING,
4315         .arg4_type      = ARG_PTR_TO_MEM,
4316         .arg5_type      = ARG_CONST_SIZE,
4317 };
4318
4319 BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
4320            int, level, int, optname, char *, optval, int, optlen)
4321 {
4322         struct sock *sk = bpf_sock->sk;
4323
4324         if (!sk_fullsock(sk))
4325                 goto err_clear;
4326 #ifdef CONFIG_INET
4327         if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) {
4328                 struct inet_connection_sock *icsk;
4329                 struct tcp_sock *tp;
4330
4331                 switch (optname) {
4332                 case TCP_CONGESTION:
4333                         icsk = inet_csk(sk);
4334
4335                         if (!icsk->icsk_ca_ops || optlen <= 1)
4336                                 goto err_clear;
4337                         strncpy(optval, icsk->icsk_ca_ops->name, optlen);
4338                         optval[optlen - 1] = 0;
4339                         break;
4340                 case TCP_SAVED_SYN:
4341                         tp = tcp_sk(sk);
4342
4343                         if (optlen <= 0 || !tp->saved_syn ||
4344                             optlen > tp->saved_syn[0])
4345                                 goto err_clear;
4346                         memcpy(optval, tp->saved_syn + 1, optlen);
4347                         break;
4348                 default:
4349                         goto err_clear;
4350                 }
4351         } else if (level == SOL_IP) {
4352                 struct inet_sock *inet = inet_sk(sk);
4353
4354                 if (optlen != sizeof(int) || sk->sk_family != AF_INET)
4355                         goto err_clear;
4356
4357                 /* Only some options are supported */
4358                 switch (optname) {
4359                 case IP_TOS:
4360                         *((int *)optval) = (int)inet->tos;
4361                         break;
4362                 default:
4363                         goto err_clear;
4364                 }
4365 #if IS_ENABLED(CONFIG_IPV6)
4366         } else if (level == SOL_IPV6) {
4367                 struct ipv6_pinfo *np = inet6_sk(sk);
4368
4369                 if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
4370                         goto err_clear;
4371
4372                 /* Only some options are supported */
4373                 switch (optname) {
4374                 case IPV6_TCLASS:
4375                         *((int *)optval) = (int)np->tclass;
4376                         break;
4377                 default:
4378                         goto err_clear;
4379                 }
4380 #endif
4381         } else {
4382                 goto err_clear;
4383         }
4384         return 0;
4385 #endif
4386 err_clear:
4387         memset(optval, 0, optlen);
4388         return -EINVAL;
4389 }
4390
4391 static const struct bpf_func_proto bpf_getsockopt_proto = {
4392         .func           = bpf_getsockopt,
4393         .gpl_only       = false,
4394         .ret_type       = RET_INTEGER,
4395         .arg1_type      = ARG_PTR_TO_CTX,
4396         .arg2_type      = ARG_ANYTHING,
4397         .arg3_type      = ARG_ANYTHING,
4398         .arg4_type      = ARG_PTR_TO_UNINIT_MEM,
4399         .arg5_type      = ARG_CONST_SIZE,
4400 };
4401
4402 BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock,
4403            int, argval)
4404 {
4405         struct sock *sk = bpf_sock->sk;
4406         int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS;
4407
4408         if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk))
4409                 return -EINVAL;
4410
4411         tcp_sk(sk)->bpf_sock_ops_cb_flags = val;
4412
4413         return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS);
4414 }
4415
4416 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = {
4417         .func           = bpf_sock_ops_cb_flags_set,
4418         .gpl_only       = false,
4419         .ret_type       = RET_INTEGER,
4420         .arg1_type      = ARG_PTR_TO_CTX,
4421         .arg2_type      = ARG_ANYTHING,
4422 };
4423
4424 const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
4425 EXPORT_SYMBOL_GPL(ipv6_bpf_stub);
4426
4427 BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr,
4428            int, addr_len)
4429 {
4430 #ifdef CONFIG_INET
4431         struct sock *sk = ctx->sk;
4432         int err;
4433
4434         /* Binding to port can be expensive so it's prohibited in the helper.
4435          * Only binding to IP is supported.
4436          */
4437         err = -EINVAL;
4438         if (addr_len < offsetofend(struct sockaddr, sa_family))
4439                 return err;
4440         if (addr->sa_family == AF_INET) {
4441                 if (addr_len < sizeof(struct sockaddr_in))
4442                         return err;
4443                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
4444                         return err;
4445                 return __inet_bind(sk, addr, addr_len, true, false);
4446 #if IS_ENABLED(CONFIG_IPV6)
4447         } else if (addr->sa_family == AF_INET6) {
4448                 if (addr_len < SIN6_LEN_RFC2133)
4449                         return err;
4450                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
4451                         return err;
4452                 /* ipv6_bpf_stub cannot be NULL, since it's called from
4453                  * bpf_cgroup_inet6_connect hook and ipv6 is already loaded
4454                  */
4455                 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, true, false);
4456 #endif /* CONFIG_IPV6 */
4457         }
4458 #endif /* CONFIG_INET */
4459
4460         return -EAFNOSUPPORT;
4461 }
4462
4463 static const struct bpf_func_proto bpf_bind_proto = {
4464         .func           = bpf_bind,
4465         .gpl_only       = false,
4466         .ret_type       = RET_INTEGER,
4467         .arg1_type      = ARG_PTR_TO_CTX,
4468         .arg2_type      = ARG_PTR_TO_MEM,
4469         .arg3_type      = ARG_CONST_SIZE,
4470 };
4471
4472 #ifdef CONFIG_XFRM
4473 BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index,
4474            struct bpf_xfrm_state *, to, u32, size, u64, flags)
4475 {
4476         const struct sec_path *sp = skb_sec_path(skb);
4477         const struct xfrm_state *x;
4478
4479         if (!sp || unlikely(index >= sp->len || flags))
4480                 goto err_clear;
4481
4482         x = sp->xvec[index];
4483
4484         if (unlikely(size != sizeof(struct bpf_xfrm_state)))
4485                 goto err_clear;
4486
4487         to->reqid = x->props.reqid;
4488         to->spi = x->id.spi;
4489         to->family = x->props.family;
4490         to->ext = 0;
4491
4492         if (to->family == AF_INET6) {
4493                 memcpy(to->remote_ipv6, x->props.saddr.a6,
4494                        sizeof(to->remote_ipv6));
4495         } else {
4496                 to->remote_ipv4 = x->props.saddr.a4;
4497                 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
4498         }
4499
4500         return 0;
4501 err_clear:
4502         memset(to, 0, size);
4503         return -EINVAL;
4504 }
4505
4506 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = {
4507         .func           = bpf_skb_get_xfrm_state,
4508         .gpl_only       = false,
4509         .ret_type       = RET_INTEGER,
4510         .arg1_type      = ARG_PTR_TO_CTX,
4511         .arg2_type      = ARG_ANYTHING,
4512         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
4513         .arg4_type      = ARG_CONST_SIZE,
4514         .arg5_type      = ARG_ANYTHING,
4515 };
4516 #endif
4517
4518 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6)
4519 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params,
4520                                   const struct neighbour *neigh,
4521                                   const struct net_device *dev)
4522 {
4523         memcpy(params->dmac, neigh->ha, ETH_ALEN);
4524         memcpy(params->smac, dev->dev_addr, ETH_ALEN);
4525         params->h_vlan_TCI = 0;
4526         params->h_vlan_proto = 0;
4527         params->ifindex = dev->ifindex;
4528
4529         return 0;
4530 }
4531 #endif
4532
4533 #if IS_ENABLED(CONFIG_INET)
4534 static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
4535                                u32 flags, bool check_mtu)
4536 {
4537         struct fib_nh_common *nhc;
4538         struct in_device *in_dev;
4539         struct neighbour *neigh;
4540         struct net_device *dev;
4541         struct fib_result res;
4542         struct flowi4 fl4;
4543         int err;
4544         u32 mtu;
4545
4546         dev = dev_get_by_index_rcu(net, params->ifindex);
4547         if (unlikely(!dev))
4548                 return -ENODEV;
4549
4550         /* verify forwarding is enabled on this interface */
4551         in_dev = __in_dev_get_rcu(dev);
4552         if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev)))
4553                 return BPF_FIB_LKUP_RET_FWD_DISABLED;
4554
4555         if (flags & BPF_FIB_LOOKUP_OUTPUT) {
4556                 fl4.flowi4_iif = 1;
4557                 fl4.flowi4_oif = params->ifindex;
4558         } else {
4559                 fl4.flowi4_iif = params->ifindex;
4560                 fl4.flowi4_oif = 0;
4561         }
4562         fl4.flowi4_tos = params->tos & IPTOS_RT_MASK;
4563         fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
4564         fl4.flowi4_flags = 0;
4565
4566         fl4.flowi4_proto = params->l4_protocol;
4567         fl4.daddr = params->ipv4_dst;
4568         fl4.saddr = params->ipv4_src;
4569         fl4.fl4_sport = params->sport;
4570         fl4.fl4_dport = params->dport;
4571
4572         if (flags & BPF_FIB_LOOKUP_DIRECT) {
4573                 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
4574                 struct fib_table *tb;
4575
4576                 tb = fib_get_table(net, tbid);
4577                 if (unlikely(!tb))
4578                         return BPF_FIB_LKUP_RET_NOT_FWDED;
4579
4580                 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
4581         } else {
4582                 fl4.flowi4_mark = 0;
4583                 fl4.flowi4_secid = 0;
4584                 fl4.flowi4_tun_key.tun_id = 0;
4585                 fl4.flowi4_uid = sock_net_uid(net, NULL);
4586
4587                 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF);
4588         }
4589
4590         if (err) {
4591                 /* map fib lookup errors to RTN_ type */
4592                 if (err == -EINVAL)
4593                         return BPF_FIB_LKUP_RET_BLACKHOLE;
4594                 if (err == -EHOSTUNREACH)
4595                         return BPF_FIB_LKUP_RET_UNREACHABLE;
4596                 if (err == -EACCES)
4597                         return BPF_FIB_LKUP_RET_PROHIBIT;
4598
4599                 return BPF_FIB_LKUP_RET_NOT_FWDED;
4600         }
4601
4602         if (res.type != RTN_UNICAST)
4603                 return BPF_FIB_LKUP_RET_NOT_FWDED;
4604
4605         if (fib_info_num_path(res.fi) > 1)
4606                 fib_select_path(net, &res, &fl4, NULL);
4607
4608         if (check_mtu) {
4609                 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst);
4610                 if (params->tot_len > mtu)
4611                         return BPF_FIB_LKUP_RET_FRAG_NEEDED;
4612         }
4613
4614         nhc = res.nhc;
4615
4616         /* do not handle lwt encaps right now */
4617         if (nhc->nhc_lwtstate)
4618                 return BPF_FIB_LKUP_RET_UNSUPP_LWT;
4619
4620         dev = nhc->nhc_dev;
4621
4622         params->rt_metric = res.fi->fib_priority;
4623
4624         /* xdp and cls_bpf programs are run in RCU-bh so
4625          * rcu_read_lock_bh is not needed here
4626          */
4627         if (likely(nhc->nhc_gw_family != AF_INET6)) {
4628                 if (nhc->nhc_gw_family)
4629                         params->ipv4_dst = nhc->nhc_gw.ipv4;
4630
4631                 neigh = __ipv4_neigh_lookup_noref(dev,
4632                                                  (__force u32)params->ipv4_dst);
4633         } else {
4634                 struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst;
4635
4636                 params->family = AF_INET6;
4637                 *dst = nhc->nhc_gw.ipv6;
4638                 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst);
4639         }
4640
4641         if (!neigh)
4642                 return BPF_FIB_LKUP_RET_NO_NEIGH;
4643
4644         return bpf_fib_set_fwd_params(params, neigh, dev);
4645 }
4646 #endif
4647
4648 #if IS_ENABLED(CONFIG_IPV6)
4649 static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
4650                                u32 flags, bool check_mtu)
4651 {
4652         struct in6_addr *src = (struct in6_addr *) params->ipv6_src;
4653         struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst;
4654         struct fib6_result res = {};
4655         struct neighbour *neigh;
4656         struct net_device *dev;
4657         struct inet6_dev *idev;
4658         struct flowi6 fl6;
4659         int strict = 0;
4660         int oif, err;
4661         u32 mtu;
4662
4663         /* link local addresses are never forwarded */
4664         if (rt6_need_strict(dst) || rt6_need_strict(src))
4665                 return BPF_FIB_LKUP_RET_NOT_FWDED;
4666
4667         dev = dev_get_by_index_rcu(net, params->ifindex);
4668         if (unlikely(!dev))
4669                 return -ENODEV;
4670
4671         idev = __in6_dev_get_safely(dev);
4672         if (unlikely(!idev || !idev->cnf.forwarding))
4673                 return BPF_FIB_LKUP_RET_FWD_DISABLED;
4674
4675         if (flags & BPF_FIB_LOOKUP_OUTPUT) {
4676                 fl6.flowi6_iif = 1;
4677                 oif = fl6.flowi6_oif = params->ifindex;
4678         } else {
4679                 oif = fl6.flowi6_iif = params->ifindex;
4680                 fl6.flowi6_oif = 0;
4681                 strict = RT6_LOOKUP_F_HAS_SADDR;
4682         }
4683         fl6.flowlabel = params->flowinfo;
4684         fl6.flowi6_scope = 0;
4685         fl6.flowi6_flags = 0;
4686         fl6.mp_hash = 0;
4687
4688         fl6.flowi6_proto = params->l4_protocol;
4689         fl6.daddr = *dst;
4690         fl6.saddr = *src;
4691         fl6.fl6_sport = params->sport;
4692         fl6.fl6_dport = params->dport;
4693
4694         if (flags & BPF_FIB_LOOKUP_DIRECT) {
4695                 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
4696                 struct fib6_table *tb;
4697
4698                 tb = ipv6_stub->fib6_get_table(net, tbid);
4699                 if (unlikely(!tb))
4700                         return BPF_FIB_LKUP_RET_NOT_FWDED;
4701
4702                 err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res,
4703                                                    strict);
4704         } else {
4705                 fl6.flowi6_mark = 0;
4706                 fl6.flowi6_secid = 0;
4707                 fl6.flowi6_tun_key.tun_id = 0;
4708                 fl6.flowi6_uid = sock_net_uid(net, NULL);
4709
4710                 err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict);
4711         }
4712
4713         if (unlikely(err || IS_ERR_OR_NULL(res.f6i) ||
4714                      res.f6i == net->ipv6.fib6_null_entry))
4715                 return BPF_FIB_LKUP_RET_NOT_FWDED;
4716
4717         switch (res.fib6_type) {
4718         /* only unicast is forwarded */
4719         case RTN_UNICAST:
4720                 break;
4721         case RTN_BLACKHOLE:
4722                 return BPF_FIB_LKUP_RET_BLACKHOLE;
4723         case RTN_UNREACHABLE:
4724                 return BPF_FIB_LKUP_RET_UNREACHABLE;
4725         case RTN_PROHIBIT:
4726                 return BPF_FIB_LKUP_RET_PROHIBIT;
4727         default:
4728                 return BPF_FIB_LKUP_RET_NOT_FWDED;
4729         }
4730
4731         ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif,
4732                                     fl6.flowi6_oif != 0, NULL, strict);
4733
4734         if (check_mtu) {
4735                 mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src);
4736                 if (params->tot_len > mtu)
4737                         return BPF_FIB_LKUP_RET_FRAG_NEEDED;
4738         }
4739
4740         if (res.nh->fib_nh_lws)
4741                 return BPF_FIB_LKUP_RET_UNSUPP_LWT;
4742
4743         if (res.nh->fib_nh_gw_family)
4744                 *dst = res.nh->fib_nh_gw6;
4745
4746         dev = res.nh->fib_nh_dev;
4747         params->rt_metric = res.f6i->fib6_metric;
4748
4749         /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is
4750          * not needed here.
4751          */
4752         neigh = __ipv6_neigh_lookup_noref_stub(dev, dst);
4753         if (!neigh)
4754                 return BPF_FIB_LKUP_RET_NO_NEIGH;
4755
4756         return bpf_fib_set_fwd_params(params, neigh, dev);
4757 }
4758 #endif
4759
4760 BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx,
4761            struct bpf_fib_lookup *, params, int, plen, u32, flags)
4762 {
4763         if (plen < sizeof(*params))
4764                 return -EINVAL;
4765
4766         if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
4767                 return -EINVAL;
4768
4769         switch (params->family) {
4770 #if IS_ENABLED(CONFIG_INET)
4771         case AF_INET:
4772                 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params,
4773                                            flags, true);
4774 #endif
4775 #if IS_ENABLED(CONFIG_IPV6)
4776         case AF_INET6:
4777                 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params,
4778                                            flags, true);
4779 #endif
4780         }
4781         return -EAFNOSUPPORT;
4782 }
4783
4784 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = {
4785         .func           = bpf_xdp_fib_lookup,
4786         .gpl_only       = true,
4787         .ret_type       = RET_INTEGER,
4788         .arg1_type      = ARG_PTR_TO_CTX,
4789         .arg2_type      = ARG_PTR_TO_MEM,
4790         .arg3_type      = ARG_CONST_SIZE,
4791         .arg4_type      = ARG_ANYTHING,
4792 };
4793
4794 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb,
4795            struct bpf_fib_lookup *, params, int, plen, u32, flags)
4796 {
4797         struct net *net = dev_net(skb->dev);
4798         int rc = -EAFNOSUPPORT;
4799
4800         if (plen < sizeof(*params))
4801                 return -EINVAL;
4802
4803         if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
4804                 return -EINVAL;
4805
4806         switch (params->family) {
4807 #if IS_ENABLED(CONFIG_INET)
4808         case AF_INET:
4809                 rc = bpf_ipv4_fib_lookup(net, params, flags, false);
4810                 break;
4811 #endif
4812 #if IS_ENABLED(CONFIG_IPV6)
4813         case AF_INET6:
4814                 rc = bpf_ipv6_fib_lookup(net, params, flags, false);
4815                 break;
4816 #endif
4817         }
4818
4819         if (!rc) {
4820                 struct net_device *dev;
4821
4822                 dev = dev_get_by_index_rcu(net, params->ifindex);
4823                 if (!is_skb_forwardable(dev, skb))
4824                         rc = BPF_FIB_LKUP_RET_FRAG_NEEDED;
4825         }
4826
4827         return rc;
4828 }
4829
4830 static const struct bpf_func_proto bpf_skb_fib_lookup_proto = {
4831         .func           = bpf_skb_fib_lookup,
4832         .gpl_only       = true,
4833         .ret_type       = RET_INTEGER,
4834         .arg1_type      = ARG_PTR_TO_CTX,
4835         .arg2_type      = ARG_PTR_TO_MEM,
4836         .arg3_type      = ARG_CONST_SIZE,
4837         .arg4_type      = ARG_ANYTHING,
4838 };
4839
4840 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
4841 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len)
4842 {
4843         int err;
4844         struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr;
4845
4846         if (!seg6_validate_srh(srh, len))
4847                 return -EINVAL;
4848
4849         switch (type) {
4850         case BPF_LWT_ENCAP_SEG6_INLINE:
4851                 if (skb->protocol != htons(ETH_P_IPV6))
4852                         return -EBADMSG;
4853
4854                 err = seg6_do_srh_inline(skb, srh);
4855                 break;
4856         case BPF_LWT_ENCAP_SEG6:
4857                 skb_reset_inner_headers(skb);
4858                 skb->encapsulation = 1;
4859                 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6);
4860                 break;
4861         default:
4862                 return -EINVAL;
4863         }
4864
4865         bpf_compute_data_pointers(skb);
4866         if (err)
4867                 return err;
4868
4869         ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
4870         skb_set_transport_header(skb, sizeof(struct ipv6hdr));
4871
4872         return seg6_lookup_nexthop(skb, NULL, 0);
4873 }
4874 #endif /* CONFIG_IPV6_SEG6_BPF */
4875
4876 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
4877 static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len,
4878                              bool ingress)
4879 {
4880         return bpf_lwt_push_ip_encap(skb, hdr, len, ingress);
4881 }
4882 #endif
4883
4884 BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr,
4885            u32, len)
4886 {
4887         switch (type) {
4888 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
4889         case BPF_LWT_ENCAP_SEG6:
4890         case BPF_LWT_ENCAP_SEG6_INLINE:
4891                 return bpf_push_seg6_encap(skb, type, hdr, len);
4892 #endif
4893 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
4894         case BPF_LWT_ENCAP_IP:
4895                 return bpf_push_ip_encap(skb, hdr, len, true /* ingress */);
4896 #endif
4897         default:
4898                 return -EINVAL;
4899         }
4900 }
4901
4902 BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type,
4903            void *, hdr, u32, len)
4904 {
4905         switch (type) {
4906 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
4907         case BPF_LWT_ENCAP_IP:
4908                 return bpf_push_ip_encap(skb, hdr, len, false /* egress */);
4909 #endif
4910         default:
4911                 return -EINVAL;
4912         }
4913 }
4914
4915 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = {
4916         .func           = bpf_lwt_in_push_encap,
4917         .gpl_only       = false,
4918         .ret_type       = RET_INTEGER,
4919         .arg1_type      = ARG_PTR_TO_CTX,
4920         .arg2_type      = ARG_ANYTHING,
4921         .arg3_type      = ARG_PTR_TO_MEM,
4922         .arg4_type      = ARG_CONST_SIZE
4923 };
4924
4925 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = {
4926         .func           = bpf_lwt_xmit_push_encap,
4927         .gpl_only       = false,
4928         .ret_type       = RET_INTEGER,
4929         .arg1_type      = ARG_PTR_TO_CTX,
4930         .arg2_type      = ARG_ANYTHING,
4931         .arg3_type      = ARG_PTR_TO_MEM,
4932         .arg4_type      = ARG_CONST_SIZE
4933 };
4934
4935 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
4936 BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset,
4937            const void *, from, u32, len)
4938 {
4939         struct seg6_bpf_srh_state *srh_state =
4940                 this_cpu_ptr(&seg6_bpf_srh_states);
4941         struct ipv6_sr_hdr *srh = srh_state->srh;
4942         void *srh_tlvs, *srh_end, *ptr;
4943         int srhoff = 0;
4944
4945         if (srh == NULL)
4946                 return -EINVAL;
4947
4948         srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4));
4949         srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen);
4950
4951         ptr = skb->data + offset;
4952         if (ptr >= srh_tlvs && ptr + len <= srh_end)
4953                 srh_state->valid = false;
4954         else if (ptr < (void *)&srh->flags ||
4955                  ptr + len > (void *)&srh->segments)
4956                 return -EFAULT;
4957
4958         if (unlikely(bpf_try_make_writable(skb, offset + len)))
4959                 return -EFAULT;
4960         if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
4961                 return -EINVAL;
4962         srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
4963
4964         memcpy(skb->data + offset, from, len);
4965         return 0;
4966 }
4967
4968 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = {
4969         .func           = bpf_lwt_seg6_store_bytes,
4970         .gpl_only       = false,
4971         .ret_type       = RET_INTEGER,
4972         .arg1_type      = ARG_PTR_TO_CTX,
4973         .arg2_type      = ARG_ANYTHING,
4974         .arg3_type      = ARG_PTR_TO_MEM,
4975         .arg4_type      = ARG_CONST_SIZE
4976 };
4977
4978 static void bpf_update_srh_state(struct sk_buff *skb)
4979 {
4980         struct seg6_bpf_srh_state *srh_state =
4981                 this_cpu_ptr(&seg6_bpf_srh_states);
4982         int srhoff = 0;
4983
4984         if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) {
4985                 srh_state->srh = NULL;
4986         } else {
4987                 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
4988                 srh_state->hdrlen = srh_state->srh->hdrlen << 3;
4989                 srh_state->valid = true;
4990         }
4991 }
4992
4993 BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb,
4994            u32, action, void *, param, u32, param_len)
4995 {
4996         struct seg6_bpf_srh_state *srh_state =
4997                 this_cpu_ptr(&seg6_bpf_srh_states);
4998         int hdroff = 0;
4999         int err;
5000
5001         switch (action) {
5002         case SEG6_LOCAL_ACTION_END_X:
5003                 if (!seg6_bpf_has_valid_srh(skb))
5004                         return -EBADMSG;
5005                 if (param_len != sizeof(struct in6_addr))
5006                         return -EINVAL;
5007                 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0);
5008         case SEG6_LOCAL_ACTION_END_T:
5009                 if (!seg6_bpf_has_valid_srh(skb))
5010                         return -EBADMSG;
5011                 if (param_len != sizeof(int))
5012                         return -EINVAL;
5013                 return seg6_lookup_nexthop(skb, NULL, *(int *)param);
5014         case SEG6_LOCAL_ACTION_END_DT6:
5015                 if (!seg6_bpf_has_valid_srh(skb))
5016                         return -EBADMSG;
5017                 if (param_len != sizeof(int))
5018                         return -EINVAL;
5019
5020                 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0)
5021                         return -EBADMSG;
5022                 if (!pskb_pull(skb, hdroff))
5023                         return -EBADMSG;
5024
5025                 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff);
5026                 skb_reset_network_header(skb);
5027                 skb_reset_transport_header(skb);
5028                 skb->encapsulation = 0;
5029
5030                 bpf_compute_data_pointers(skb);
5031                 bpf_update_srh_state(skb);
5032                 return seg6_lookup_nexthop(skb, NULL, *(int *)param);
5033         case SEG6_LOCAL_ACTION_END_B6:
5034                 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
5035                         return -EBADMSG;
5036                 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE,
5037                                           param, param_len);
5038                 if (!err)
5039                         bpf_update_srh_state(skb);
5040
5041                 return err;
5042         case SEG6_LOCAL_ACTION_END_B6_ENCAP:
5043                 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
5044                         return -EBADMSG;
5045                 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6,
5046                                           param, param_len);
5047                 if (!err)
5048                         bpf_update_srh_state(skb);
5049
5050                 return err;
5051         default:
5052                 return -EINVAL;
5053         }
5054 }
5055
5056 static const struct bpf_func_proto bpf_lwt_seg6_action_proto = {
5057         .func           = bpf_lwt_seg6_action,
5058         .gpl_only       = false,
5059         .ret_type       = RET_INTEGER,
5060         .arg1_type      = ARG_PTR_TO_CTX,
5061         .arg2_type      = ARG_ANYTHING,
5062         .arg3_type      = ARG_PTR_TO_MEM,
5063         .arg4_type      = ARG_CONST_SIZE
5064 };
5065
5066 BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset,
5067            s32, len)
5068 {
5069         struct seg6_bpf_srh_state *srh_state =
5070                 this_cpu_ptr(&seg6_bpf_srh_states);
5071         struct ipv6_sr_hdr *srh = srh_state->srh;
5072         void *srh_end, *srh_tlvs, *ptr;
5073         struct ipv6hdr *hdr;
5074         int srhoff = 0;
5075         int ret;
5076
5077         if (unlikely(srh == NULL))
5078                 return -EINVAL;
5079
5080         srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) +
5081                         ((srh->first_segment + 1) << 4));
5082         srh_end = (void *)((unsigned char *)srh + sizeof(*srh) +
5083                         srh_state->hdrlen);
5084         ptr = skb->data + offset;
5085
5086         if (unlikely(ptr < srh_tlvs || ptr > srh_end))
5087                 return -EFAULT;
5088         if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end))
5089                 return -EFAULT;
5090
5091         if (len > 0) {
5092                 ret = skb_cow_head(skb, len);
5093                 if (unlikely(ret < 0))
5094                         return ret;
5095
5096                 ret = bpf_skb_net_hdr_push(skb, offset, len);
5097         } else {
5098                 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len);
5099         }
5100
5101         bpf_compute_data_pointers(skb);
5102         if (unlikely(ret < 0))
5103                 return ret;
5104
5105         hdr = (struct ipv6hdr *)skb->data;
5106         hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
5107
5108         if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
5109                 return -EINVAL;
5110         srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
5111         srh_state->hdrlen += len;
5112         srh_state->valid = false;
5113         return 0;
5114 }
5115
5116 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = {
5117         .func           = bpf_lwt_seg6_adjust_srh,
5118         .gpl_only       = false,
5119         .ret_type       = RET_INTEGER,
5120         .arg1_type      = ARG_PTR_TO_CTX,
5121         .arg2_type      = ARG_ANYTHING,
5122         .arg3_type      = ARG_ANYTHING,
5123 };
5124 #endif /* CONFIG_IPV6_SEG6_BPF */
5125
5126 #ifdef CONFIG_INET
5127 static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple,
5128                               int dif, int sdif, u8 family, u8 proto)
5129 {
5130         bool refcounted = false;
5131         struct sock *sk = NULL;
5132
5133         if (family == AF_INET) {
5134                 __be32 src4 = tuple->ipv4.saddr;
5135                 __be32 dst4 = tuple->ipv4.daddr;
5136
5137                 if (proto == IPPROTO_TCP)
5138                         sk = __inet_lookup(net, &tcp_hashinfo, NULL, 0,
5139                                            src4, tuple->ipv4.sport,
5140                                            dst4, tuple->ipv4.dport,
5141                                            dif, sdif, &refcounted);
5142                 else
5143                         sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport,
5144                                                dst4, tuple->ipv4.dport,
5145                                                dif, sdif, &udp_table, NULL);
5146 #if IS_ENABLED(CONFIG_IPV6)
5147         } else {
5148                 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr;
5149                 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr;
5150
5151                 if (proto == IPPROTO_TCP)
5152                         sk = __inet6_lookup(net, &tcp_hashinfo, NULL, 0,
5153                                             src6, tuple->ipv6.sport,
5154                                             dst6, ntohs(tuple->ipv6.dport),
5155                                             dif, sdif, &refcounted);
5156                 else if (likely(ipv6_bpf_stub))
5157                         sk = ipv6_bpf_stub->udp6_lib_lookup(net,
5158                                                             src6, tuple->ipv6.sport,
5159                                                             dst6, tuple->ipv6.dport,
5160                                                             dif, sdif,
5161                                                             &udp_table, NULL);
5162 #endif
5163         }
5164
5165         if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) {
5166                 WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
5167                 sk = NULL;
5168         }
5169         return sk;
5170 }
5171
5172 /* bpf_skc_lookup performs the core lookup for different types of sockets,
5173  * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE.
5174  * Returns the socket as an 'unsigned long' to simplify the casting in the
5175  * callers to satisfy BPF_CALL declarations.
5176  */
5177 static struct sock *
5178 __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
5179                  struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id,
5180                  u64 flags)
5181 {
5182         struct sock *sk = NULL;
5183         u8 family = AF_UNSPEC;
5184         struct net *net;
5185         int sdif;
5186
5187         if (len == sizeof(tuple->ipv4))
5188                 family = AF_INET;
5189         else if (len == sizeof(tuple->ipv6))
5190                 family = AF_INET6;
5191         else
5192                 return NULL;
5193
5194         if (unlikely(family == AF_UNSPEC || flags ||
5195                      !((s32)netns_id < 0 || netns_id <= S32_MAX)))
5196                 goto out;
5197
5198         if (family == AF_INET)
5199                 sdif = inet_sdif(skb);
5200         else
5201                 sdif = inet6_sdif(skb);
5202
5203         if ((s32)netns_id < 0) {
5204                 net = caller_net;
5205                 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto);
5206         } else {
5207                 net = get_net_ns_by_id(caller_net, netns_id);
5208                 if (unlikely(!net))
5209                         goto out;
5210                 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto);
5211                 put_net(net);
5212         }
5213
5214 out:
5215         return sk;
5216 }
5217
5218 static struct sock *
5219 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
5220                 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id,
5221                 u64 flags)
5222 {
5223         struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net,
5224                                            ifindex, proto, netns_id, flags);
5225
5226         if (sk) {
5227                 sk = sk_to_full_sk(sk);
5228                 if (!sk_fullsock(sk)) {
5229                         sock_gen_put(sk);
5230                         return NULL;
5231                 }
5232         }
5233
5234         return sk;
5235 }
5236
5237 static struct sock *
5238 bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
5239                u8 proto, u64 netns_id, u64 flags)
5240 {
5241         struct net *caller_net;
5242         int ifindex;
5243
5244         if (skb->dev) {
5245                 caller_net = dev_net(skb->dev);
5246                 ifindex = skb->dev->ifindex;
5247         } else {
5248                 caller_net = sock_net(skb->sk);
5249                 ifindex = 0;
5250         }
5251
5252         return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto,
5253                                 netns_id, flags);
5254 }
5255
5256 static struct sock *
5257 bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
5258               u8 proto, u64 netns_id, u64 flags)
5259 {
5260         struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id,
5261                                          flags);
5262
5263         if (sk) {
5264                 sk = sk_to_full_sk(sk);
5265                 if (!sk_fullsock(sk)) {
5266                         sock_gen_put(sk);
5267                         return NULL;
5268                 }
5269         }
5270
5271         return sk;
5272 }
5273
5274 BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb,
5275            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
5276 {
5277         return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP,
5278                                              netns_id, flags);
5279 }
5280
5281 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = {
5282         .func           = bpf_skc_lookup_tcp,
5283         .gpl_only       = false,
5284         .pkt_access     = true,
5285         .ret_type       = RET_PTR_TO_SOCK_COMMON_OR_NULL,
5286         .arg1_type      = ARG_PTR_TO_CTX,
5287         .arg2_type      = ARG_PTR_TO_MEM,
5288         .arg3_type      = ARG_CONST_SIZE,
5289         .arg4_type      = ARG_ANYTHING,
5290         .arg5_type      = ARG_ANYTHING,
5291 };
5292
5293 BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb,
5294            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
5295 {
5296         return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP,
5297                                             netns_id, flags);
5298 }
5299
5300 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = {
5301         .func           = bpf_sk_lookup_tcp,
5302         .gpl_only       = false,
5303         .pkt_access     = true,
5304         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
5305         .arg1_type      = ARG_PTR_TO_CTX,
5306         .arg2_type      = ARG_PTR_TO_MEM,
5307         .arg3_type      = ARG_CONST_SIZE,
5308         .arg4_type      = ARG_ANYTHING,
5309         .arg5_type      = ARG_ANYTHING,
5310 };
5311
5312 BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb,
5313            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
5314 {
5315         return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP,
5316                                             netns_id, flags);
5317 }
5318
5319 static const struct bpf_func_proto bpf_sk_lookup_udp_proto = {
5320         .func           = bpf_sk_lookup_udp,
5321         .gpl_only       = false,
5322         .pkt_access     = true,
5323         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
5324         .arg1_type      = ARG_PTR_TO_CTX,
5325         .arg2_type      = ARG_PTR_TO_MEM,
5326         .arg3_type      = ARG_CONST_SIZE,
5327         .arg4_type      = ARG_ANYTHING,
5328         .arg5_type      = ARG_ANYTHING,
5329 };
5330
5331 BPF_CALL_1(bpf_sk_release, struct sock *, sk)
5332 {
5333         /* Only full sockets have sk->sk_flags. */
5334         if (!sk_fullsock(sk) || !sock_flag(sk, SOCK_RCU_FREE))
5335                 sock_gen_put(sk);
5336         return 0;
5337 }
5338
5339 static const struct bpf_func_proto bpf_sk_release_proto = {
5340         .func           = bpf_sk_release,
5341         .gpl_only       = false,
5342         .ret_type       = RET_INTEGER,
5343         .arg1_type      = ARG_PTR_TO_SOCK_COMMON,
5344 };
5345
5346 BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx,
5347            struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
5348 {
5349         struct net *caller_net = dev_net(ctx->rxq->dev);
5350         int ifindex = ctx->rxq->dev->ifindex;
5351
5352         return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net,
5353                                               ifindex, IPPROTO_UDP, netns_id,
5354                                               flags);
5355 }
5356
5357 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = {
5358         .func           = bpf_xdp_sk_lookup_udp,
5359         .gpl_only       = false,
5360         .pkt_access     = true,
5361         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
5362         .arg1_type      = ARG_PTR_TO_CTX,
5363         .arg2_type      = ARG_PTR_TO_MEM,
5364         .arg3_type      = ARG_CONST_SIZE,
5365         .arg4_type      = ARG_ANYTHING,
5366         .arg5_type      = ARG_ANYTHING,
5367 };
5368
5369 BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx,
5370            struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
5371 {
5372         struct net *caller_net = dev_net(ctx->rxq->dev);
5373         int ifindex = ctx->rxq->dev->ifindex;
5374
5375         return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net,
5376                                                ifindex, IPPROTO_TCP, netns_id,
5377                                                flags);
5378 }
5379
5380 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = {
5381         .func           = bpf_xdp_skc_lookup_tcp,
5382         .gpl_only       = false,
5383         .pkt_access     = true,
5384         .ret_type       = RET_PTR_TO_SOCK_COMMON_OR_NULL,
5385         .arg1_type      = ARG_PTR_TO_CTX,
5386         .arg2_type      = ARG_PTR_TO_MEM,
5387         .arg3_type      = ARG_CONST_SIZE,
5388         .arg4_type      = ARG_ANYTHING,
5389         .arg5_type      = ARG_ANYTHING,
5390 };
5391
5392 BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx,
5393            struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
5394 {
5395         struct net *caller_net = dev_net(ctx->rxq->dev);
5396         int ifindex = ctx->rxq->dev->ifindex;
5397
5398         return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net,
5399                                               ifindex, IPPROTO_TCP, netns_id,
5400                                               flags);
5401 }
5402
5403 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = {
5404         .func           = bpf_xdp_sk_lookup_tcp,
5405         .gpl_only       = false,
5406         .pkt_access     = true,
5407         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
5408         .arg1_type      = ARG_PTR_TO_CTX,
5409         .arg2_type      = ARG_PTR_TO_MEM,
5410         .arg3_type      = ARG_CONST_SIZE,
5411         .arg4_type      = ARG_ANYTHING,
5412         .arg5_type      = ARG_ANYTHING,
5413 };
5414
5415 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx,
5416            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
5417 {
5418         return (unsigned long)__bpf_skc_lookup(NULL, tuple, len,
5419                                                sock_net(ctx->sk), 0,
5420                                                IPPROTO_TCP, netns_id, flags);
5421 }
5422
5423 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = {
5424         .func           = bpf_sock_addr_skc_lookup_tcp,
5425         .gpl_only       = false,
5426         .ret_type       = RET_PTR_TO_SOCK_COMMON_OR_NULL,
5427         .arg1_type      = ARG_PTR_TO_CTX,
5428         .arg2_type      = ARG_PTR_TO_MEM,
5429         .arg3_type      = ARG_CONST_SIZE,
5430         .arg4_type      = ARG_ANYTHING,
5431         .arg5_type      = ARG_ANYTHING,
5432 };
5433
5434 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx,
5435            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
5436 {
5437         return (unsigned long)__bpf_sk_lookup(NULL, tuple, len,
5438                                               sock_net(ctx->sk), 0, IPPROTO_TCP,
5439                                               netns_id, flags);
5440 }
5441
5442 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = {
5443         .func           = bpf_sock_addr_sk_lookup_tcp,
5444         .gpl_only       = false,
5445         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
5446         .arg1_type      = ARG_PTR_TO_CTX,
5447         .arg2_type      = ARG_PTR_TO_MEM,
5448         .arg3_type      = ARG_CONST_SIZE,
5449         .arg4_type      = ARG_ANYTHING,
5450         .arg5_type      = ARG_ANYTHING,
5451 };
5452
5453 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx,
5454            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
5455 {
5456         return (unsigned long)__bpf_sk_lookup(NULL, tuple, len,
5457                                               sock_net(ctx->sk), 0, IPPROTO_UDP,
5458                                               netns_id, flags);
5459 }
5460
5461 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = {
5462         .func           = bpf_sock_addr_sk_lookup_udp,
5463         .gpl_only       = false,
5464         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
5465         .arg1_type      = ARG_PTR_TO_CTX,
5466         .arg2_type      = ARG_PTR_TO_MEM,
5467         .arg3_type      = ARG_CONST_SIZE,
5468         .arg4_type      = ARG_ANYTHING,
5469         .arg5_type      = ARG_ANYTHING,
5470 };
5471
5472 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
5473                                   struct bpf_insn_access_aux *info)
5474 {
5475         if (off < 0 || off >= offsetofend(struct bpf_tcp_sock,
5476                                           icsk_retransmits))
5477                 return false;
5478
5479         if (off % size != 0)
5480                 return false;
5481
5482         switch (off) {
5483         case offsetof(struct bpf_tcp_sock, bytes_received):
5484         case offsetof(struct bpf_tcp_sock, bytes_acked):
5485                 return size == sizeof(__u64);
5486         default:
5487                 return size == sizeof(__u32);
5488         }
5489 }
5490
5491 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
5492                                     const struct bpf_insn *si,
5493                                     struct bpf_insn *insn_buf,
5494                                     struct bpf_prog *prog, u32 *target_size)
5495 {
5496         struct bpf_insn *insn = insn_buf;
5497
5498 #define BPF_TCP_SOCK_GET_COMMON(FIELD)                                  \
5499         do {                                                            \
5500                 BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) >     \
5501                              sizeof_field(struct bpf_tcp_sock, FIELD)); \
5502                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\
5503                                       si->dst_reg, si->src_reg,         \
5504                                       offsetof(struct tcp_sock, FIELD)); \
5505         } while (0)
5506
5507 #define BPF_INET_SOCK_GET_COMMON(FIELD)                                 \
5508         do {                                                            \
5509                 BUILD_BUG_ON(sizeof_field(struct inet_connection_sock,  \
5510                                           FIELD) >                      \
5511                              sizeof_field(struct bpf_tcp_sock, FIELD)); \
5512                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                 \
5513                                         struct inet_connection_sock,    \
5514                                         FIELD),                         \
5515                                       si->dst_reg, si->src_reg,         \
5516                                       offsetof(                         \
5517                                         struct inet_connection_sock,    \
5518                                         FIELD));                        \
5519         } while (0)
5520
5521         if (insn > insn_buf)
5522                 return insn - insn_buf;
5523
5524         switch (si->off) {
5525         case offsetof(struct bpf_tcp_sock, rtt_min):
5526                 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) !=
5527                              sizeof(struct minmax));
5528                 BUILD_BUG_ON(sizeof(struct minmax) <
5529                              sizeof(struct minmax_sample));
5530
5531                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
5532                                       offsetof(struct tcp_sock, rtt_min) +
5533                                       offsetof(struct minmax_sample, v));
5534                 break;
5535         case offsetof(struct bpf_tcp_sock, snd_cwnd):
5536                 BPF_TCP_SOCK_GET_COMMON(snd_cwnd);
5537                 break;
5538         case offsetof(struct bpf_tcp_sock, srtt_us):
5539                 BPF_TCP_SOCK_GET_COMMON(srtt_us);
5540                 break;
5541         case offsetof(struct bpf_tcp_sock, snd_ssthresh):
5542                 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh);
5543                 break;
5544         case offsetof(struct bpf_tcp_sock, rcv_nxt):
5545                 BPF_TCP_SOCK_GET_COMMON(rcv_nxt);
5546                 break;
5547         case offsetof(struct bpf_tcp_sock, snd_nxt):
5548                 BPF_TCP_SOCK_GET_COMMON(snd_nxt);
5549                 break;
5550         case offsetof(struct bpf_tcp_sock, snd_una):
5551                 BPF_TCP_SOCK_GET_COMMON(snd_una);
5552                 break;
5553         case offsetof(struct bpf_tcp_sock, mss_cache):
5554                 BPF_TCP_SOCK_GET_COMMON(mss_cache);
5555                 break;
5556         case offsetof(struct bpf_tcp_sock, ecn_flags):
5557                 BPF_TCP_SOCK_GET_COMMON(ecn_flags);
5558                 break;
5559         case offsetof(struct bpf_tcp_sock, rate_delivered):
5560                 BPF_TCP_SOCK_GET_COMMON(rate_delivered);
5561                 break;
5562         case offsetof(struct bpf_tcp_sock, rate_interval_us):
5563                 BPF_TCP_SOCK_GET_COMMON(rate_interval_us);
5564                 break;
5565         case offsetof(struct bpf_tcp_sock, packets_out):
5566                 BPF_TCP_SOCK_GET_COMMON(packets_out);
5567                 break;
5568         case offsetof(struct bpf_tcp_sock, retrans_out):
5569                 BPF_TCP_SOCK_GET_COMMON(retrans_out);
5570                 break;
5571         case offsetof(struct bpf_tcp_sock, total_retrans):
5572                 BPF_TCP_SOCK_GET_COMMON(total_retrans);
5573                 break;
5574         case offsetof(struct bpf_tcp_sock, segs_in):
5575                 BPF_TCP_SOCK_GET_COMMON(segs_in);
5576                 break;
5577         case offsetof(struct bpf_tcp_sock, data_segs_in):
5578                 BPF_TCP_SOCK_GET_COMMON(data_segs_in);
5579                 break;
5580         case offsetof(struct bpf_tcp_sock, segs_out):
5581                 BPF_TCP_SOCK_GET_COMMON(segs_out);
5582                 break;
5583         case offsetof(struct bpf_tcp_sock, data_segs_out):
5584                 BPF_TCP_SOCK_GET_COMMON(data_segs_out);
5585                 break;
5586         case offsetof(struct bpf_tcp_sock, lost_out):
5587                 BPF_TCP_SOCK_GET_COMMON(lost_out);
5588                 break;
5589         case offsetof(struct bpf_tcp_sock, sacked_out):
5590                 BPF_TCP_SOCK_GET_COMMON(sacked_out);
5591                 break;
5592         case offsetof(struct bpf_tcp_sock, bytes_received):
5593                 BPF_TCP_SOCK_GET_COMMON(bytes_received);
5594                 break;
5595         case offsetof(struct bpf_tcp_sock, bytes_acked):
5596                 BPF_TCP_SOCK_GET_COMMON(bytes_acked);
5597                 break;
5598         case offsetof(struct bpf_tcp_sock, dsack_dups):
5599                 BPF_TCP_SOCK_GET_COMMON(dsack_dups);
5600                 break;
5601         case offsetof(struct bpf_tcp_sock, delivered):
5602                 BPF_TCP_SOCK_GET_COMMON(delivered);
5603                 break;
5604         case offsetof(struct bpf_tcp_sock, delivered_ce):
5605                 BPF_TCP_SOCK_GET_COMMON(delivered_ce);
5606                 break;
5607         case offsetof(struct bpf_tcp_sock, icsk_retransmits):
5608                 BPF_INET_SOCK_GET_COMMON(icsk_retransmits);
5609                 break;
5610         }
5611
5612         return insn - insn_buf;
5613 }
5614
5615 BPF_CALL_1(bpf_tcp_sock, struct sock *, sk)
5616 {
5617         if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP)
5618                 return (unsigned long)sk;
5619
5620         return (unsigned long)NULL;
5621 }
5622
5623 const struct bpf_func_proto bpf_tcp_sock_proto = {
5624         .func           = bpf_tcp_sock,
5625         .gpl_only       = false,
5626         .ret_type       = RET_PTR_TO_TCP_SOCK_OR_NULL,
5627         .arg1_type      = ARG_PTR_TO_SOCK_COMMON,
5628 };
5629
5630 BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk)
5631 {
5632         sk = sk_to_full_sk(sk);
5633
5634         if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE))
5635                 return (unsigned long)sk;
5636
5637         return (unsigned long)NULL;
5638 }
5639
5640 static const struct bpf_func_proto bpf_get_listener_sock_proto = {
5641         .func           = bpf_get_listener_sock,
5642         .gpl_only       = false,
5643         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
5644         .arg1_type      = ARG_PTR_TO_SOCK_COMMON,
5645 };
5646
5647 BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb)
5648 {
5649         unsigned int iphdr_len;
5650
5651         if (skb->protocol == cpu_to_be16(ETH_P_IP))
5652                 iphdr_len = sizeof(struct iphdr);
5653         else if (skb->protocol == cpu_to_be16(ETH_P_IPV6))
5654                 iphdr_len = sizeof(struct ipv6hdr);
5655         else
5656                 return 0;
5657
5658         if (skb_headlen(skb) < iphdr_len)
5659                 return 0;
5660
5661         if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len))
5662                 return 0;
5663
5664         return INET_ECN_set_ce(skb);
5665 }
5666
5667 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
5668                                   struct bpf_insn_access_aux *info)
5669 {
5670         if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id))
5671                 return false;
5672
5673         if (off % size != 0)
5674                 return false;
5675
5676         switch (off) {
5677         default:
5678                 return size == sizeof(__u32);
5679         }
5680 }
5681
5682 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
5683                                     const struct bpf_insn *si,
5684                                     struct bpf_insn *insn_buf,
5685                                     struct bpf_prog *prog, u32 *target_size)
5686 {
5687         struct bpf_insn *insn = insn_buf;
5688
5689 #define BPF_XDP_SOCK_GET(FIELD)                                         \
5690         do {                                                            \
5691                 BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) >     \
5692                              sizeof_field(struct bpf_xdp_sock, FIELD)); \
5693                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\
5694                                       si->dst_reg, si->src_reg,         \
5695                                       offsetof(struct xdp_sock, FIELD)); \
5696         } while (0)
5697
5698         switch (si->off) {
5699         case offsetof(struct bpf_xdp_sock, queue_id):
5700                 BPF_XDP_SOCK_GET(queue_id);
5701                 break;
5702         }
5703
5704         return insn - insn_buf;
5705 }
5706
5707 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = {
5708         .func           = bpf_skb_ecn_set_ce,
5709         .gpl_only       = false,
5710         .ret_type       = RET_INTEGER,
5711         .arg1_type      = ARG_PTR_TO_CTX,
5712 };
5713
5714 BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len,
5715            struct tcphdr *, th, u32, th_len)
5716 {
5717 #ifdef CONFIG_SYN_COOKIES
5718         u32 cookie;
5719         int ret;
5720
5721         if (unlikely(th_len < sizeof(*th)))
5722                 return -EINVAL;
5723
5724         /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */
5725         if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN)
5726                 return -EINVAL;
5727
5728         if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies)
5729                 return -EINVAL;
5730
5731         if (!th->ack || th->rst || th->syn)
5732                 return -ENOENT;
5733
5734         if (tcp_synq_no_recent_overflow(sk))
5735                 return -ENOENT;
5736
5737         cookie = ntohl(th->ack_seq) - 1;
5738
5739         switch (sk->sk_family) {
5740         case AF_INET:
5741                 if (unlikely(iph_len < sizeof(struct iphdr)))
5742                         return -EINVAL;
5743
5744                 ret = __cookie_v4_check((struct iphdr *)iph, th, cookie);
5745                 break;
5746
5747 #if IS_BUILTIN(CONFIG_IPV6)
5748         case AF_INET6:
5749                 if (unlikely(iph_len < sizeof(struct ipv6hdr)))
5750                         return -EINVAL;
5751
5752                 ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie);
5753                 break;
5754 #endif /* CONFIG_IPV6 */
5755
5756         default:
5757                 return -EPROTONOSUPPORT;
5758         }
5759
5760         if (ret > 0)
5761                 return 0;
5762
5763         return -ENOENT;
5764 #else
5765         return -ENOTSUPP;
5766 #endif
5767 }
5768
5769 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = {
5770         .func           = bpf_tcp_check_syncookie,
5771         .gpl_only       = true,
5772         .pkt_access     = true,
5773         .ret_type       = RET_INTEGER,
5774         .arg1_type      = ARG_PTR_TO_SOCK_COMMON,
5775         .arg2_type      = ARG_PTR_TO_MEM,
5776         .arg3_type      = ARG_CONST_SIZE,
5777         .arg4_type      = ARG_PTR_TO_MEM,
5778         .arg5_type      = ARG_CONST_SIZE,
5779 };
5780
5781 BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len,
5782            struct tcphdr *, th, u32, th_len)
5783 {
5784 #ifdef CONFIG_SYN_COOKIES
5785         u32 cookie;
5786         u16 mss;
5787
5788         if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4))
5789                 return -EINVAL;
5790
5791         if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN)
5792                 return -EINVAL;
5793
5794         if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies)
5795                 return -ENOENT;
5796
5797         if (!th->syn || th->ack || th->fin || th->rst)
5798                 return -EINVAL;
5799
5800         if (unlikely(iph_len < sizeof(struct iphdr)))
5801                 return -EINVAL;
5802
5803         /* Both struct iphdr and struct ipv6hdr have the version field at the
5804          * same offset so we can cast to the shorter header (struct iphdr).
5805          */
5806         switch (((struct iphdr *)iph)->version) {
5807         case 4:
5808                 if (sk->sk_family == AF_INET6 && sk->sk_ipv6only)
5809                         return -EINVAL;
5810
5811                 mss = tcp_v4_get_syncookie(sk, iph, th, &cookie);
5812                 break;
5813
5814 #if IS_BUILTIN(CONFIG_IPV6)
5815         case 6:
5816                 if (unlikely(iph_len < sizeof(struct ipv6hdr)))
5817                         return -EINVAL;
5818
5819                 if (sk->sk_family != AF_INET6)
5820                         return -EINVAL;
5821
5822                 mss = tcp_v6_get_syncookie(sk, iph, th, &cookie);
5823                 break;
5824 #endif /* CONFIG_IPV6 */
5825
5826         default:
5827                 return -EPROTONOSUPPORT;
5828         }
5829         if (mss == 0)
5830                 return -ENOENT;
5831
5832         return cookie | ((u64)mss << 32);
5833 #else
5834         return -EOPNOTSUPP;
5835 #endif /* CONFIG_SYN_COOKIES */
5836 }
5837
5838 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = {
5839         .func           = bpf_tcp_gen_syncookie,
5840         .gpl_only       = true, /* __cookie_v*_init_sequence() is GPL */
5841         .pkt_access     = true,
5842         .ret_type       = RET_INTEGER,
5843         .arg1_type      = ARG_PTR_TO_SOCK_COMMON,
5844         .arg2_type      = ARG_PTR_TO_MEM,
5845         .arg3_type      = ARG_CONST_SIZE,
5846         .arg4_type      = ARG_PTR_TO_MEM,
5847         .arg5_type      = ARG_CONST_SIZE,
5848 };
5849
5850 #endif /* CONFIG_INET */
5851
5852 bool bpf_helper_changes_pkt_data(void *func)
5853 {
5854         if (func == bpf_skb_vlan_push ||
5855             func == bpf_skb_vlan_pop ||
5856             func == bpf_skb_store_bytes ||
5857             func == bpf_skb_change_proto ||
5858             func == bpf_skb_change_head ||
5859             func == sk_skb_change_head ||
5860             func == bpf_skb_change_tail ||
5861             func == sk_skb_change_tail ||
5862             func == bpf_skb_adjust_room ||
5863             func == bpf_skb_pull_data ||
5864             func == sk_skb_pull_data ||
5865             func == bpf_clone_redirect ||
5866             func == bpf_l3_csum_replace ||
5867             func == bpf_l4_csum_replace ||
5868             func == bpf_xdp_adjust_head ||
5869             func == bpf_xdp_adjust_meta ||
5870             func == bpf_msg_pull_data ||
5871             func == bpf_msg_push_data ||
5872             func == bpf_msg_pop_data ||
5873             func == bpf_xdp_adjust_tail ||
5874 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
5875             func == bpf_lwt_seg6_store_bytes ||
5876             func == bpf_lwt_seg6_adjust_srh ||
5877             func == bpf_lwt_seg6_action ||
5878 #endif
5879             func == bpf_lwt_in_push_encap ||
5880             func == bpf_lwt_xmit_push_encap)
5881                 return true;
5882
5883         return false;
5884 }
5885
5886 const struct bpf_func_proto *
5887 bpf_base_func_proto(enum bpf_func_id func_id)
5888 {
5889         switch (func_id) {
5890         case BPF_FUNC_map_lookup_elem:
5891                 return &bpf_map_lookup_elem_proto;
5892         case BPF_FUNC_map_update_elem:
5893                 return &bpf_map_update_elem_proto;
5894         case BPF_FUNC_map_delete_elem:
5895                 return &bpf_map_delete_elem_proto;
5896         case BPF_FUNC_map_push_elem:
5897                 return &bpf_map_push_elem_proto;
5898         case BPF_FUNC_map_pop_elem:
5899                 return &bpf_map_pop_elem_proto;
5900         case BPF_FUNC_map_peek_elem:
5901                 return &bpf_map_peek_elem_proto;
5902         case BPF_FUNC_get_prandom_u32:
5903                 return &bpf_get_prandom_u32_proto;
5904         case BPF_FUNC_get_smp_processor_id:
5905                 return &bpf_get_raw_smp_processor_id_proto;
5906         case BPF_FUNC_get_numa_node_id:
5907                 return &bpf_get_numa_node_id_proto;
5908         case BPF_FUNC_tail_call:
5909                 return &bpf_tail_call_proto;
5910         case BPF_FUNC_ktime_get_ns:
5911                 return &bpf_ktime_get_ns_proto;
5912         default:
5913                 break;
5914         }
5915
5916         if (!capable(CAP_SYS_ADMIN))
5917                 return NULL;
5918
5919         switch (func_id) {
5920         case BPF_FUNC_spin_lock:
5921                 return &bpf_spin_lock_proto;
5922         case BPF_FUNC_spin_unlock:
5923                 return &bpf_spin_unlock_proto;
5924         case BPF_FUNC_trace_printk:
5925                 return bpf_get_trace_printk_proto();
5926         case BPF_FUNC_jiffies64:
5927                 return &bpf_jiffies64_proto;
5928         default:
5929                 return NULL;
5930         }
5931 }
5932
5933 static const struct bpf_func_proto *
5934 sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
5935 {
5936         switch (func_id) {
5937         /* inet and inet6 sockets are created in a process
5938          * context so there is always a valid uid/gid
5939          */
5940         case BPF_FUNC_get_current_uid_gid:
5941                 return &bpf_get_current_uid_gid_proto;
5942         case BPF_FUNC_get_local_storage:
5943                 return &bpf_get_local_storage_proto;
5944         default:
5945                 return bpf_base_func_proto(func_id);
5946         }
5947 }
5948
5949 static const struct bpf_func_proto *
5950 sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
5951 {
5952         switch (func_id) {
5953         /* inet and inet6 sockets are created in a process
5954          * context so there is always a valid uid/gid
5955          */
5956         case BPF_FUNC_get_current_uid_gid:
5957                 return &bpf_get_current_uid_gid_proto;
5958         case BPF_FUNC_bind:
5959                 switch (prog->expected_attach_type) {
5960                 case BPF_CGROUP_INET4_CONNECT:
5961                 case BPF_CGROUP_INET6_CONNECT:
5962                         return &bpf_bind_proto;
5963                 default:
5964                         return NULL;
5965                 }
5966         case BPF_FUNC_get_socket_cookie:
5967                 return &bpf_get_socket_cookie_sock_addr_proto;
5968         case BPF_FUNC_get_local_storage:
5969                 return &bpf_get_local_storage_proto;
5970 #ifdef CONFIG_INET
5971         case BPF_FUNC_sk_lookup_tcp:
5972                 return &bpf_sock_addr_sk_lookup_tcp_proto;
5973         case BPF_FUNC_sk_lookup_udp:
5974                 return &bpf_sock_addr_sk_lookup_udp_proto;
5975         case BPF_FUNC_sk_release:
5976                 return &bpf_sk_release_proto;
5977         case BPF_FUNC_skc_lookup_tcp:
5978                 return &bpf_sock_addr_skc_lookup_tcp_proto;
5979 #endif /* CONFIG_INET */
5980         case BPF_FUNC_sk_storage_get:
5981                 return &bpf_sk_storage_get_proto;
5982         case BPF_FUNC_sk_storage_delete:
5983                 return &bpf_sk_storage_delete_proto;
5984         default:
5985                 return bpf_base_func_proto(func_id);
5986         }
5987 }
5988
5989 static const struct bpf_func_proto *
5990 sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
5991 {
5992         switch (func_id) {
5993         case BPF_FUNC_skb_load_bytes:
5994                 return &bpf_skb_load_bytes_proto;
5995         case BPF_FUNC_skb_load_bytes_relative:
5996                 return &bpf_skb_load_bytes_relative_proto;
5997         case BPF_FUNC_get_socket_cookie:
5998                 return &bpf_get_socket_cookie_proto;
5999         case BPF_FUNC_get_socket_uid:
6000                 return &bpf_get_socket_uid_proto;
6001         case BPF_FUNC_perf_event_output:
6002                 return &bpf_skb_event_output_proto;
6003         default:
6004                 return bpf_base_func_proto(func_id);
6005         }
6006 }
6007
6008 const struct bpf_func_proto bpf_sk_storage_get_proto __weak;
6009 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak;
6010
6011 static const struct bpf_func_proto *
6012 cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6013 {
6014         switch (func_id) {
6015         case BPF_FUNC_get_local_storage:
6016                 return &bpf_get_local_storage_proto;
6017         case BPF_FUNC_sk_fullsock:
6018                 return &bpf_sk_fullsock_proto;
6019         case BPF_FUNC_sk_storage_get:
6020                 return &bpf_sk_storage_get_proto;
6021         case BPF_FUNC_sk_storage_delete:
6022                 return &bpf_sk_storage_delete_proto;
6023         case BPF_FUNC_perf_event_output:
6024                 return &bpf_skb_event_output_proto;
6025 #ifdef CONFIG_SOCK_CGROUP_DATA
6026         case BPF_FUNC_skb_cgroup_id:
6027                 return &bpf_skb_cgroup_id_proto;
6028 #endif
6029 #ifdef CONFIG_INET
6030         case BPF_FUNC_tcp_sock:
6031                 return &bpf_tcp_sock_proto;
6032         case BPF_FUNC_get_listener_sock:
6033                 return &bpf_get_listener_sock_proto;
6034         case BPF_FUNC_skb_ecn_set_ce:
6035                 return &bpf_skb_ecn_set_ce_proto;
6036 #endif
6037         default:
6038                 return sk_filter_func_proto(func_id, prog);
6039         }
6040 }
6041
6042 static const struct bpf_func_proto *
6043 tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6044 {
6045         switch (func_id) {
6046         case BPF_FUNC_skb_store_bytes:
6047                 return &bpf_skb_store_bytes_proto;
6048         case BPF_FUNC_skb_load_bytes:
6049                 return &bpf_skb_load_bytes_proto;
6050         case BPF_FUNC_skb_load_bytes_relative:
6051                 return &bpf_skb_load_bytes_relative_proto;
6052         case BPF_FUNC_skb_pull_data:
6053                 return &bpf_skb_pull_data_proto;
6054         case BPF_FUNC_csum_diff:
6055                 return &bpf_csum_diff_proto;
6056         case BPF_FUNC_csum_update:
6057                 return &bpf_csum_update_proto;
6058         case BPF_FUNC_l3_csum_replace:
6059                 return &bpf_l3_csum_replace_proto;
6060         case BPF_FUNC_l4_csum_replace:
6061                 return &bpf_l4_csum_replace_proto;
6062         case BPF_FUNC_clone_redirect:
6063                 return &bpf_clone_redirect_proto;
6064         case BPF_FUNC_get_cgroup_classid:
6065                 return &bpf_get_cgroup_classid_proto;
6066         case BPF_FUNC_skb_vlan_push:
6067                 return &bpf_skb_vlan_push_proto;
6068         case BPF_FUNC_skb_vlan_pop:
6069                 return &bpf_skb_vlan_pop_proto;
6070         case BPF_FUNC_skb_change_proto:
6071                 return &bpf_skb_change_proto_proto;
6072         case BPF_FUNC_skb_change_type:
6073                 return &bpf_skb_change_type_proto;
6074         case BPF_FUNC_skb_adjust_room:
6075                 return &bpf_skb_adjust_room_proto;
6076         case BPF_FUNC_skb_change_tail:
6077                 return &bpf_skb_change_tail_proto;
6078         case BPF_FUNC_skb_get_tunnel_key:
6079                 return &bpf_skb_get_tunnel_key_proto;
6080         case BPF_FUNC_skb_set_tunnel_key:
6081                 return bpf_get_skb_set_tunnel_proto(func_id);
6082         case BPF_FUNC_skb_get_tunnel_opt:
6083                 return &bpf_skb_get_tunnel_opt_proto;
6084         case BPF_FUNC_skb_set_tunnel_opt:
6085                 return bpf_get_skb_set_tunnel_proto(func_id);
6086         case BPF_FUNC_redirect:
6087                 return &bpf_redirect_proto;
6088         case BPF_FUNC_get_route_realm:
6089                 return &bpf_get_route_realm_proto;
6090         case BPF_FUNC_get_hash_recalc:
6091                 return &bpf_get_hash_recalc_proto;
6092         case BPF_FUNC_set_hash_invalid:
6093                 return &bpf_set_hash_invalid_proto;
6094         case BPF_FUNC_set_hash:
6095                 return &bpf_set_hash_proto;
6096         case BPF_FUNC_perf_event_output:
6097                 return &bpf_skb_event_output_proto;
6098         case BPF_FUNC_get_smp_processor_id:
6099                 return &bpf_get_smp_processor_id_proto;
6100         case BPF_FUNC_skb_under_cgroup:
6101                 return &bpf_skb_under_cgroup_proto;
6102         case BPF_FUNC_get_socket_cookie:
6103                 return &bpf_get_socket_cookie_proto;
6104         case BPF_FUNC_get_socket_uid:
6105                 return &bpf_get_socket_uid_proto;
6106         case BPF_FUNC_fib_lookup:
6107                 return &bpf_skb_fib_lookup_proto;
6108         case BPF_FUNC_sk_fullsock:
6109                 return &bpf_sk_fullsock_proto;
6110         case BPF_FUNC_sk_storage_get:
6111                 return &bpf_sk_storage_get_proto;
6112         case BPF_FUNC_sk_storage_delete:
6113                 return &bpf_sk_storage_delete_proto;
6114 #ifdef CONFIG_XFRM
6115         case BPF_FUNC_skb_get_xfrm_state:
6116                 return &bpf_skb_get_xfrm_state_proto;
6117 #endif
6118 #ifdef CONFIG_SOCK_CGROUP_DATA
6119         case BPF_FUNC_skb_cgroup_id:
6120                 return &bpf_skb_cgroup_id_proto;
6121         case BPF_FUNC_skb_ancestor_cgroup_id:
6122                 return &bpf_skb_ancestor_cgroup_id_proto;
6123 #endif
6124 #ifdef CONFIG_INET
6125         case BPF_FUNC_sk_lookup_tcp:
6126                 return &bpf_sk_lookup_tcp_proto;
6127         case BPF_FUNC_sk_lookup_udp:
6128                 return &bpf_sk_lookup_udp_proto;
6129         case BPF_FUNC_sk_release:
6130                 return &bpf_sk_release_proto;
6131         case BPF_FUNC_tcp_sock:
6132                 return &bpf_tcp_sock_proto;
6133         case BPF_FUNC_get_listener_sock:
6134                 return &bpf_get_listener_sock_proto;
6135         case BPF_FUNC_skc_lookup_tcp:
6136                 return &bpf_skc_lookup_tcp_proto;
6137         case BPF_FUNC_tcp_check_syncookie:
6138                 return &bpf_tcp_check_syncookie_proto;
6139         case BPF_FUNC_skb_ecn_set_ce:
6140                 return &bpf_skb_ecn_set_ce_proto;
6141         case BPF_FUNC_tcp_gen_syncookie:
6142                 return &bpf_tcp_gen_syncookie_proto;
6143 #endif
6144         default:
6145                 return bpf_base_func_proto(func_id);
6146         }
6147 }
6148
6149 static const struct bpf_func_proto *
6150 xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6151 {
6152         switch (func_id) {
6153         case BPF_FUNC_perf_event_output:
6154                 return &bpf_xdp_event_output_proto;
6155         case BPF_FUNC_get_smp_processor_id:
6156                 return &bpf_get_smp_processor_id_proto;
6157         case BPF_FUNC_csum_diff:
6158                 return &bpf_csum_diff_proto;
6159         case BPF_FUNC_xdp_adjust_head:
6160                 return &bpf_xdp_adjust_head_proto;
6161         case BPF_FUNC_xdp_adjust_meta:
6162                 return &bpf_xdp_adjust_meta_proto;
6163         case BPF_FUNC_redirect:
6164                 return &bpf_xdp_redirect_proto;
6165         case BPF_FUNC_redirect_map:
6166                 return &bpf_xdp_redirect_map_proto;
6167         case BPF_FUNC_xdp_adjust_tail:
6168                 return &bpf_xdp_adjust_tail_proto;
6169         case BPF_FUNC_fib_lookup:
6170                 return &bpf_xdp_fib_lookup_proto;
6171 #ifdef CONFIG_INET
6172         case BPF_FUNC_sk_lookup_udp:
6173                 return &bpf_xdp_sk_lookup_udp_proto;
6174         case BPF_FUNC_sk_lookup_tcp:
6175                 return &bpf_xdp_sk_lookup_tcp_proto;
6176         case BPF_FUNC_sk_release:
6177                 return &bpf_sk_release_proto;
6178         case BPF_FUNC_skc_lookup_tcp:
6179                 return &bpf_xdp_skc_lookup_tcp_proto;
6180         case BPF_FUNC_tcp_check_syncookie:
6181                 return &bpf_tcp_check_syncookie_proto;
6182         case BPF_FUNC_tcp_gen_syncookie:
6183                 return &bpf_tcp_gen_syncookie_proto;
6184 #endif
6185         default:
6186                 return bpf_base_func_proto(func_id);
6187         }
6188 }
6189
6190 const struct bpf_func_proto bpf_sock_map_update_proto __weak;
6191 const struct bpf_func_proto bpf_sock_hash_update_proto __weak;
6192
6193 static const struct bpf_func_proto *
6194 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6195 {
6196         switch (func_id) {
6197         case BPF_FUNC_setsockopt:
6198                 return &bpf_setsockopt_proto;
6199         case BPF_FUNC_getsockopt:
6200                 return &bpf_getsockopt_proto;
6201         case BPF_FUNC_sock_ops_cb_flags_set:
6202                 return &bpf_sock_ops_cb_flags_set_proto;
6203         case BPF_FUNC_sock_map_update:
6204                 return &bpf_sock_map_update_proto;
6205         case BPF_FUNC_sock_hash_update:
6206                 return &bpf_sock_hash_update_proto;
6207         case BPF_FUNC_get_socket_cookie:
6208                 return &bpf_get_socket_cookie_sock_ops_proto;
6209         case BPF_FUNC_get_local_storage:
6210                 return &bpf_get_local_storage_proto;
6211         case BPF_FUNC_perf_event_output:
6212                 return &bpf_sockopt_event_output_proto;
6213         case BPF_FUNC_sk_storage_get:
6214                 return &bpf_sk_storage_get_proto;
6215         case BPF_FUNC_sk_storage_delete:
6216                 return &bpf_sk_storage_delete_proto;
6217 #ifdef CONFIG_INET
6218         case BPF_FUNC_tcp_sock:
6219                 return &bpf_tcp_sock_proto;
6220 #endif /* CONFIG_INET */
6221         default:
6222                 return bpf_base_func_proto(func_id);
6223         }
6224 }
6225
6226 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak;
6227 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak;
6228
6229 static const struct bpf_func_proto *
6230 sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6231 {
6232         switch (func_id) {
6233         case BPF_FUNC_msg_redirect_map:
6234                 return &bpf_msg_redirect_map_proto;
6235         case BPF_FUNC_msg_redirect_hash:
6236                 return &bpf_msg_redirect_hash_proto;
6237         case BPF_FUNC_msg_apply_bytes:
6238                 return &bpf_msg_apply_bytes_proto;
6239         case BPF_FUNC_msg_cork_bytes:
6240                 return &bpf_msg_cork_bytes_proto;
6241         case BPF_FUNC_msg_pull_data:
6242                 return &bpf_msg_pull_data_proto;
6243         case BPF_FUNC_msg_push_data:
6244                 return &bpf_msg_push_data_proto;
6245         case BPF_FUNC_msg_pop_data:
6246                 return &bpf_msg_pop_data_proto;
6247         default:
6248                 return bpf_base_func_proto(func_id);
6249         }
6250 }
6251
6252 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak;
6253 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak;
6254
6255 static const struct bpf_func_proto *
6256 sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6257 {
6258         switch (func_id) {
6259         case BPF_FUNC_skb_store_bytes:
6260                 return &bpf_skb_store_bytes_proto;
6261         case BPF_FUNC_skb_load_bytes:
6262                 return &bpf_skb_load_bytes_proto;
6263         case BPF_FUNC_skb_pull_data:
6264                 return &sk_skb_pull_data_proto;
6265         case BPF_FUNC_skb_change_tail:
6266                 return &sk_skb_change_tail_proto;
6267         case BPF_FUNC_skb_change_head:
6268                 return &sk_skb_change_head_proto;
6269         case BPF_FUNC_get_socket_cookie:
6270                 return &bpf_get_socket_cookie_proto;
6271         case BPF_FUNC_get_socket_uid:
6272                 return &bpf_get_socket_uid_proto;
6273         case BPF_FUNC_sk_redirect_map:
6274                 return &bpf_sk_redirect_map_proto;
6275         case BPF_FUNC_sk_redirect_hash:
6276                 return &bpf_sk_redirect_hash_proto;
6277         case BPF_FUNC_perf_event_output:
6278                 return &bpf_skb_event_output_proto;
6279 #ifdef CONFIG_INET
6280         case BPF_FUNC_sk_lookup_tcp:
6281                 return &bpf_sk_lookup_tcp_proto;
6282         case BPF_FUNC_sk_lookup_udp:
6283                 return &bpf_sk_lookup_udp_proto;
6284         case BPF_FUNC_sk_release:
6285                 return &bpf_sk_release_proto;
6286         case BPF_FUNC_skc_lookup_tcp:
6287                 return &bpf_skc_lookup_tcp_proto;
6288 #endif
6289         default:
6290                 return bpf_base_func_proto(func_id);
6291         }
6292 }
6293
6294 static const struct bpf_func_proto *
6295 flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6296 {
6297         switch (func_id) {
6298         case BPF_FUNC_skb_load_bytes:
6299                 return &bpf_flow_dissector_load_bytes_proto;
6300         default:
6301                 return bpf_base_func_proto(func_id);
6302         }
6303 }
6304
6305 static const struct bpf_func_proto *
6306 lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6307 {
6308         switch (func_id) {
6309         case BPF_FUNC_skb_load_bytes:
6310                 return &bpf_skb_load_bytes_proto;
6311         case BPF_FUNC_skb_pull_data:
6312                 return &bpf_skb_pull_data_proto;
6313         case BPF_FUNC_csum_diff:
6314                 return &bpf_csum_diff_proto;
6315         case BPF_FUNC_get_cgroup_classid:
6316                 return &bpf_get_cgroup_classid_proto;
6317         case BPF_FUNC_get_route_realm:
6318                 return &bpf_get_route_realm_proto;
6319         case BPF_FUNC_get_hash_recalc:
6320                 return &bpf_get_hash_recalc_proto;
6321         case BPF_FUNC_perf_event_output:
6322                 return &bpf_skb_event_output_proto;
6323         case BPF_FUNC_get_smp_processor_id:
6324                 return &bpf_get_smp_processor_id_proto;
6325         case BPF_FUNC_skb_under_cgroup:
6326                 return &bpf_skb_under_cgroup_proto;
6327         default:
6328                 return bpf_base_func_proto(func_id);
6329         }
6330 }
6331
6332 static const struct bpf_func_proto *
6333 lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6334 {
6335         switch (func_id) {
6336         case BPF_FUNC_lwt_push_encap:
6337                 return &bpf_lwt_in_push_encap_proto;
6338         default:
6339                 return lwt_out_func_proto(func_id, prog);
6340         }
6341 }
6342
6343 static const struct bpf_func_proto *
6344 lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6345 {
6346         switch (func_id) {
6347         case BPF_FUNC_skb_get_tunnel_key:
6348                 return &bpf_skb_get_tunnel_key_proto;
6349         case BPF_FUNC_skb_set_tunnel_key:
6350                 return bpf_get_skb_set_tunnel_proto(func_id);
6351         case BPF_FUNC_skb_get_tunnel_opt:
6352                 return &bpf_skb_get_tunnel_opt_proto;
6353         case BPF_FUNC_skb_set_tunnel_opt:
6354                 return bpf_get_skb_set_tunnel_proto(func_id);
6355         case BPF_FUNC_redirect:
6356                 return &bpf_redirect_proto;
6357         case BPF_FUNC_clone_redirect:
6358                 return &bpf_clone_redirect_proto;
6359         case BPF_FUNC_skb_change_tail:
6360                 return &bpf_skb_change_tail_proto;
6361         case BPF_FUNC_skb_change_head:
6362                 return &bpf_skb_change_head_proto;
6363         case BPF_FUNC_skb_store_bytes:
6364                 return &bpf_skb_store_bytes_proto;
6365         case BPF_FUNC_csum_update:
6366                 return &bpf_csum_update_proto;
6367         case BPF_FUNC_l3_csum_replace:
6368                 return &bpf_l3_csum_replace_proto;
6369         case BPF_FUNC_l4_csum_replace:
6370                 return &bpf_l4_csum_replace_proto;
6371         case BPF_FUNC_set_hash_invalid:
6372                 return &bpf_set_hash_invalid_proto;
6373         case BPF_FUNC_lwt_push_encap:
6374                 return &bpf_lwt_xmit_push_encap_proto;
6375         default:
6376                 return lwt_out_func_proto(func_id, prog);
6377         }
6378 }
6379
6380 static const struct bpf_func_proto *
6381 lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6382 {
6383         switch (func_id) {
6384 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
6385         case BPF_FUNC_lwt_seg6_store_bytes:
6386                 return &bpf_lwt_seg6_store_bytes_proto;
6387         case BPF_FUNC_lwt_seg6_action:
6388                 return &bpf_lwt_seg6_action_proto;
6389         case BPF_FUNC_lwt_seg6_adjust_srh:
6390                 return &bpf_lwt_seg6_adjust_srh_proto;
6391 #endif
6392         default:
6393                 return lwt_out_func_proto(func_id, prog);
6394         }
6395 }
6396
6397 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type,
6398                                     const struct bpf_prog *prog,
6399                                     struct bpf_insn_access_aux *info)
6400 {
6401         const int size_default = sizeof(__u32);
6402
6403         if (off < 0 || off >= sizeof(struct __sk_buff))
6404                 return false;
6405
6406         /* The verifier guarantees that size > 0. */
6407         if (off % size != 0)
6408                 return false;
6409
6410         switch (off) {
6411         case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
6412                 if (off + size > offsetofend(struct __sk_buff, cb[4]))
6413                         return false;
6414                 break;
6415         case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]):
6416         case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]):
6417         case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4):
6418         case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4):
6419         case bpf_ctx_range(struct __sk_buff, data):
6420         case bpf_ctx_range(struct __sk_buff, data_meta):
6421         case bpf_ctx_range(struct __sk_buff, data_end):
6422                 if (size != size_default)
6423                         return false;
6424                 break;
6425         case bpf_ctx_range_ptr(struct __sk_buff, flow_keys):
6426                 return false;
6427         case bpf_ctx_range(struct __sk_buff, tstamp):
6428                 if (size != sizeof(__u64))
6429                         return false;
6430                 break;
6431         case offsetof(struct __sk_buff, sk):
6432                 if (type == BPF_WRITE || size != sizeof(__u64))
6433                         return false;
6434                 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL;
6435                 break;
6436         default:
6437                 /* Only narrow read access allowed for now. */
6438                 if (type == BPF_WRITE) {
6439                         if (size != size_default)
6440                                 return false;
6441                 } else {
6442                         bpf_ctx_record_field_size(info, size_default);
6443                         if (!bpf_ctx_narrow_access_ok(off, size, size_default))
6444                                 return false;
6445                 }
6446         }
6447
6448         return true;
6449 }
6450
6451 static bool sk_filter_is_valid_access(int off, int size,
6452                                       enum bpf_access_type type,
6453                                       const struct bpf_prog *prog,
6454                                       struct bpf_insn_access_aux *info)
6455 {
6456         switch (off) {
6457         case bpf_ctx_range(struct __sk_buff, tc_classid):
6458         case bpf_ctx_range(struct __sk_buff, data):
6459         case bpf_ctx_range(struct __sk_buff, data_meta):
6460         case bpf_ctx_range(struct __sk_buff, data_end):
6461         case bpf_ctx_range_till(struct __sk_buff, family, local_port):
6462         case bpf_ctx_range(struct __sk_buff, tstamp):
6463         case bpf_ctx_range(struct __sk_buff, wire_len):
6464                 return false;
6465         }
6466
6467         if (type == BPF_WRITE) {
6468                 switch (off) {
6469                 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
6470                         break;
6471                 default:
6472                         return false;
6473                 }
6474         }
6475
6476         return bpf_skb_is_valid_access(off, size, type, prog, info);
6477 }
6478
6479 static bool cg_skb_is_valid_access(int off, int size,
6480                                    enum bpf_access_type type,
6481                                    const struct bpf_prog *prog,
6482                                    struct bpf_insn_access_aux *info)
6483 {
6484         switch (off) {
6485         case bpf_ctx_range(struct __sk_buff, tc_classid):
6486         case bpf_ctx_range(struct __sk_buff, data_meta):
6487         case bpf_ctx_range(struct __sk_buff, wire_len):
6488                 return false;
6489         case bpf_ctx_range(struct __sk_buff, data):
6490         case bpf_ctx_range(struct __sk_buff, data_end):
6491                 if (!capable(CAP_SYS_ADMIN))
6492                         return false;
6493                 break;
6494         }
6495
6496         if (type == BPF_WRITE) {
6497                 switch (off) {
6498                 case bpf_ctx_range(struct __sk_buff, mark):
6499                 case bpf_ctx_range(struct __sk_buff, priority):
6500                 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
6501                         break;
6502                 case bpf_ctx_range(struct __sk_buff, tstamp):
6503                         if (!capable(CAP_SYS_ADMIN))
6504                                 return false;
6505                         break;
6506                 default:
6507                         return false;
6508                 }
6509         }
6510
6511         switch (off) {
6512         case bpf_ctx_range(struct __sk_buff, data):
6513                 info->reg_type = PTR_TO_PACKET;
6514                 break;
6515         case bpf_ctx_range(struct __sk_buff, data_end):
6516                 info->reg_type = PTR_TO_PACKET_END;
6517                 break;
6518         }
6519
6520         return bpf_skb_is_valid_access(off, size, type, prog, info);
6521 }
6522
6523 static bool lwt_is_valid_access(int off, int size,
6524                                 enum bpf_access_type type,
6525                                 const struct bpf_prog *prog,
6526                                 struct bpf_insn_access_aux *info)
6527 {
6528         switch (off) {
6529         case bpf_ctx_range(struct __sk_buff, tc_classid):
6530         case bpf_ctx_range_till(struct __sk_buff, family, local_port):
6531         case bpf_ctx_range(struct __sk_buff, data_meta):
6532         case bpf_ctx_range(struct __sk_buff, tstamp):
6533         case bpf_ctx_range(struct __sk_buff, wire_len):
6534                 return false;
6535         }
6536
6537         if (type == BPF_WRITE) {
6538                 switch (off) {
6539                 case bpf_ctx_range(struct __sk_buff, mark):
6540                 case bpf_ctx_range(struct __sk_buff, priority):
6541                 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
6542                         break;
6543                 default:
6544                         return false;
6545                 }
6546         }
6547
6548         switch (off) {
6549         case bpf_ctx_range(struct __sk_buff, data):
6550                 info->reg_type = PTR_TO_PACKET;
6551                 break;
6552         case bpf_ctx_range(struct __sk_buff, data_end):
6553                 info->reg_type = PTR_TO_PACKET_END;
6554                 break;
6555         }
6556
6557         return bpf_skb_is_valid_access(off, size, type, prog, info);
6558 }
6559
6560 /* Attach type specific accesses */
6561 static bool __sock_filter_check_attach_type(int off,
6562                                             enum bpf_access_type access_type,
6563                                             enum bpf_attach_type attach_type)
6564 {
6565         switch (off) {
6566         case offsetof(struct bpf_sock, bound_dev_if):
6567         case offsetof(struct bpf_sock, mark):
6568         case offsetof(struct bpf_sock, priority):
6569                 switch (attach_type) {
6570                 case BPF_CGROUP_INET_SOCK_CREATE:
6571                         goto full_access;
6572                 default:
6573                         return false;
6574                 }
6575         case bpf_ctx_range(struct bpf_sock, src_ip4):
6576                 switch (attach_type) {
6577                 case BPF_CGROUP_INET4_POST_BIND:
6578                         goto read_only;
6579                 default:
6580                         return false;
6581                 }
6582         case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
6583                 switch (attach_type) {
6584                 case BPF_CGROUP_INET6_POST_BIND:
6585                         goto read_only;
6586                 default:
6587                         return false;
6588                 }
6589         case bpf_ctx_range(struct bpf_sock, src_port):
6590                 switch (attach_type) {
6591                 case BPF_CGROUP_INET4_POST_BIND:
6592                 case BPF_CGROUP_INET6_POST_BIND:
6593                         goto read_only;
6594                 default:
6595                         return false;
6596                 }
6597         }
6598 read_only:
6599         return access_type == BPF_READ;
6600 full_access:
6601         return true;
6602 }
6603
6604 bool bpf_sock_common_is_valid_access(int off, int size,
6605                                      enum bpf_access_type type,
6606                                      struct bpf_insn_access_aux *info)
6607 {
6608         switch (off) {
6609         case bpf_ctx_range_till(struct bpf_sock, type, priority):
6610                 return false;
6611         default:
6612                 return bpf_sock_is_valid_access(off, size, type, info);
6613         }
6614 }
6615
6616 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
6617                               struct bpf_insn_access_aux *info)
6618 {
6619         const int size_default = sizeof(__u32);
6620
6621         if (off < 0 || off >= sizeof(struct bpf_sock))
6622                 return false;
6623         if (off % size != 0)
6624                 return false;
6625
6626         switch (off) {
6627         case offsetof(struct bpf_sock, state):
6628         case offsetof(struct bpf_sock, family):
6629         case offsetof(struct bpf_sock, type):
6630         case offsetof(struct bpf_sock, protocol):
6631         case offsetof(struct bpf_sock, dst_port):
6632         case offsetof(struct bpf_sock, src_port):
6633         case bpf_ctx_range(struct bpf_sock, src_ip4):
6634         case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
6635         case bpf_ctx_range(struct bpf_sock, dst_ip4):
6636         case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]):
6637                 bpf_ctx_record_field_size(info, size_default);
6638                 return bpf_ctx_narrow_access_ok(off, size, size_default);
6639         }
6640
6641         return size == size_default;
6642 }
6643
6644 static bool sock_filter_is_valid_access(int off, int size,
6645                                         enum bpf_access_type type,
6646                                         const struct bpf_prog *prog,
6647                                         struct bpf_insn_access_aux *info)
6648 {
6649         if (!bpf_sock_is_valid_access(off, size, type, info))
6650                 return false;
6651         return __sock_filter_check_attach_type(off, type,
6652                                                prog->expected_attach_type);
6653 }
6654
6655 static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write,
6656                              const struct bpf_prog *prog)
6657 {
6658         /* Neither direct read nor direct write requires any preliminary
6659          * action.
6660          */
6661         return 0;
6662 }
6663
6664 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write,
6665                                 const struct bpf_prog *prog, int drop_verdict)
6666 {
6667         struct bpf_insn *insn = insn_buf;
6668
6669         if (!direct_write)
6670                 return 0;
6671
6672         /* if (!skb->cloned)
6673          *       goto start;
6674          *
6675          * (Fast-path, otherwise approximation that we might be
6676          *  a clone, do the rest in helper.)
6677          */
6678         *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET());
6679         *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK);
6680         *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7);
6681
6682         /* ret = bpf_skb_pull_data(skb, 0); */
6683         *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
6684         *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2);
6685         *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
6686                                BPF_FUNC_skb_pull_data);
6687         /* if (!ret)
6688          *      goto restore;
6689          * return TC_ACT_SHOT;
6690          */
6691         *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2);
6692         *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict);
6693         *insn++ = BPF_EXIT_INSN();
6694
6695         /* restore: */
6696         *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6);
6697         /* start: */
6698         *insn++ = prog->insnsi[0];
6699
6700         return insn - insn_buf;
6701 }
6702
6703 static int bpf_gen_ld_abs(const struct bpf_insn *orig,
6704                           struct bpf_insn *insn_buf)
6705 {
6706         bool indirect = BPF_MODE(orig->code) == BPF_IND;
6707         struct bpf_insn *insn = insn_buf;
6708
6709         /* We're guaranteed here that CTX is in R6. */
6710         *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX);
6711         if (!indirect) {
6712                 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm);
6713         } else {
6714                 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg);
6715                 if (orig->imm)
6716                         *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm);
6717         }
6718
6719         switch (BPF_SIZE(orig->code)) {
6720         case BPF_B:
6721                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache);
6722                 break;
6723         case BPF_H:
6724                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache);
6725                 break;
6726         case BPF_W:
6727                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache);
6728                 break;
6729         }
6730
6731         *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2);
6732         *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0);
6733         *insn++ = BPF_EXIT_INSN();
6734
6735         return insn - insn_buf;
6736 }
6737
6738 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write,
6739                                const struct bpf_prog *prog)
6740 {
6741         return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT);
6742 }
6743
6744 static bool tc_cls_act_is_valid_access(int off, int size,
6745                                        enum bpf_access_type type,
6746                                        const struct bpf_prog *prog,
6747                                        struct bpf_insn_access_aux *info)
6748 {
6749         if (type == BPF_WRITE) {
6750                 switch (off) {
6751                 case bpf_ctx_range(struct __sk_buff, mark):
6752                 case bpf_ctx_range(struct __sk_buff, tc_index):
6753                 case bpf_ctx_range(struct __sk_buff, priority):
6754                 case bpf_ctx_range(struct __sk_buff, tc_classid):
6755                 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
6756                 case bpf_ctx_range(struct __sk_buff, tstamp):
6757                 case bpf_ctx_range(struct __sk_buff, queue_mapping):
6758                         break;
6759                 default:
6760                         return false;
6761                 }
6762         }
6763
6764         switch (off) {
6765         case bpf_ctx_range(struct __sk_buff, data):
6766                 info->reg_type = PTR_TO_PACKET;
6767                 break;
6768         case bpf_ctx_range(struct __sk_buff, data_meta):
6769                 info->reg_type = PTR_TO_PACKET_META;
6770                 break;
6771         case bpf_ctx_range(struct __sk_buff, data_end):
6772                 info->reg_type = PTR_TO_PACKET_END;
6773                 break;
6774         case bpf_ctx_range_till(struct __sk_buff, family, local_port):
6775                 return false;
6776         }
6777
6778         return bpf_skb_is_valid_access(off, size, type, prog, info);
6779 }
6780
6781 static bool __is_valid_xdp_access(int off, int size)
6782 {
6783         if (off < 0 || off >= sizeof(struct xdp_md))
6784                 return false;
6785         if (off % size != 0)
6786                 return false;
6787         if (size != sizeof(__u32))
6788                 return false;
6789
6790         return true;
6791 }
6792
6793 static bool xdp_is_valid_access(int off, int size,
6794                                 enum bpf_access_type type,
6795                                 const struct bpf_prog *prog,
6796                                 struct bpf_insn_access_aux *info)
6797 {
6798         if (type == BPF_WRITE) {
6799                 if (bpf_prog_is_dev_bound(prog->aux)) {
6800                         switch (off) {
6801                         case offsetof(struct xdp_md, rx_queue_index):
6802                                 return __is_valid_xdp_access(off, size);
6803                         }
6804                 }
6805                 return false;
6806         }
6807
6808         switch (off) {
6809         case offsetof(struct xdp_md, data):
6810                 info->reg_type = PTR_TO_PACKET;
6811                 break;
6812         case offsetof(struct xdp_md, data_meta):
6813                 info->reg_type = PTR_TO_PACKET_META;
6814                 break;
6815         case offsetof(struct xdp_md, data_end):
6816                 info->reg_type = PTR_TO_PACKET_END;
6817                 break;
6818         }
6819
6820         return __is_valid_xdp_access(off, size);
6821 }
6822
6823 void bpf_warn_invalid_xdp_action(u32 act)
6824 {
6825         const u32 act_max = XDP_REDIRECT;
6826
6827         WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n",
6828                   act > act_max ? "Illegal" : "Driver unsupported",
6829                   act);
6830 }
6831 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
6832
6833 static bool sock_addr_is_valid_access(int off, int size,
6834                                       enum bpf_access_type type,
6835                                       const struct bpf_prog *prog,
6836                                       struct bpf_insn_access_aux *info)
6837 {
6838         const int size_default = sizeof(__u32);
6839
6840         if (off < 0 || off >= sizeof(struct bpf_sock_addr))
6841                 return false;
6842         if (off % size != 0)
6843                 return false;
6844
6845         /* Disallow access to IPv6 fields from IPv4 contex and vise
6846          * versa.
6847          */
6848         switch (off) {
6849         case bpf_ctx_range(struct bpf_sock_addr, user_ip4):
6850                 switch (prog->expected_attach_type) {
6851                 case BPF_CGROUP_INET4_BIND:
6852                 case BPF_CGROUP_INET4_CONNECT:
6853                 case BPF_CGROUP_UDP4_SENDMSG:
6854                 case BPF_CGROUP_UDP4_RECVMSG:
6855                         break;
6856                 default:
6857                         return false;
6858                 }
6859                 break;
6860         case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
6861                 switch (prog->expected_attach_type) {
6862                 case BPF_CGROUP_INET6_BIND:
6863                 case BPF_CGROUP_INET6_CONNECT:
6864                 case BPF_CGROUP_UDP6_SENDMSG:
6865                 case BPF_CGROUP_UDP6_RECVMSG:
6866                         break;
6867                 default:
6868                         return false;
6869                 }
6870                 break;
6871         case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4):
6872                 switch (prog->expected_attach_type) {
6873                 case BPF_CGROUP_UDP4_SENDMSG:
6874                         break;
6875                 default:
6876                         return false;
6877                 }
6878                 break;
6879         case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
6880                                 msg_src_ip6[3]):
6881                 switch (prog->expected_attach_type) {
6882                 case BPF_CGROUP_UDP6_SENDMSG:
6883                         break;
6884                 default:
6885                         return false;
6886                 }
6887                 break;
6888         }
6889
6890         switch (off) {
6891         case bpf_ctx_range(struct bpf_sock_addr, user_ip4):
6892         case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
6893         case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4):
6894         case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
6895                                 msg_src_ip6[3]):
6896                 if (type == BPF_READ) {
6897                         bpf_ctx_record_field_size(info, size_default);
6898
6899                         if (bpf_ctx_wide_access_ok(off, size,
6900                                                    struct bpf_sock_addr,
6901                                                    user_ip6))
6902                                 return true;
6903
6904                         if (bpf_ctx_wide_access_ok(off, size,
6905                                                    struct bpf_sock_addr,
6906                                                    msg_src_ip6))
6907                                 return true;
6908
6909                         if (!bpf_ctx_narrow_access_ok(off, size, size_default))
6910                                 return false;
6911                 } else {
6912                         if (bpf_ctx_wide_access_ok(off, size,
6913                                                    struct bpf_sock_addr,
6914                                                    user_ip6))
6915                                 return true;
6916
6917                         if (bpf_ctx_wide_access_ok(off, size,
6918                                                    struct bpf_sock_addr,
6919                                                    msg_src_ip6))
6920                                 return true;
6921
6922                         if (size != size_default)
6923                                 return false;
6924                 }
6925                 break;
6926         case bpf_ctx_range(struct bpf_sock_addr, user_port):
6927                 if (size != size_default)
6928                         return false;
6929                 break;
6930         case offsetof(struct bpf_sock_addr, sk):
6931                 if (type != BPF_READ)
6932                         return false;
6933                 if (size != sizeof(__u64))
6934                         return false;
6935                 info->reg_type = PTR_TO_SOCKET;
6936                 break;
6937         default:
6938                 if (type == BPF_READ) {
6939                         if (size != size_default)
6940                                 return false;
6941                 } else {
6942                         return false;
6943                 }
6944         }
6945
6946         return true;
6947 }
6948
6949 static bool sock_ops_is_valid_access(int off, int size,
6950                                      enum bpf_access_type type,
6951                                      const struct bpf_prog *prog,
6952                                      struct bpf_insn_access_aux *info)
6953 {
6954         const int size_default = sizeof(__u32);
6955
6956         if (off < 0 || off >= sizeof(struct bpf_sock_ops))
6957                 return false;
6958
6959         /* The verifier guarantees that size > 0. */
6960         if (off % size != 0)
6961                 return false;
6962
6963         if (type == BPF_WRITE) {
6964                 switch (off) {
6965                 case offsetof(struct bpf_sock_ops, reply):
6966                 case offsetof(struct bpf_sock_ops, sk_txhash):
6967                         if (size != size_default)
6968                                 return false;
6969                         break;
6970                 default:
6971                         return false;
6972                 }
6973         } else {
6974                 switch (off) {
6975                 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received,
6976                                         bytes_acked):
6977                         if (size != sizeof(__u64))
6978                                 return false;
6979                         break;
6980                 case offsetof(struct bpf_sock_ops, sk):
6981                         if (size != sizeof(__u64))
6982                                 return false;
6983                         info->reg_type = PTR_TO_SOCKET_OR_NULL;
6984                         break;
6985                 default:
6986                         if (size != size_default)
6987                                 return false;
6988                         break;
6989                 }
6990         }
6991
6992         return true;
6993 }
6994
6995 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write,
6996                            const struct bpf_prog *prog)
6997 {
6998         return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP);
6999 }
7000
7001 static bool sk_skb_is_valid_access(int off, int size,
7002                                    enum bpf_access_type type,
7003                                    const struct bpf_prog *prog,
7004                                    struct bpf_insn_access_aux *info)
7005 {
7006         switch (off) {
7007         case bpf_ctx_range(struct __sk_buff, tc_classid):
7008         case bpf_ctx_range(struct __sk_buff, data_meta):
7009         case bpf_ctx_range(struct __sk_buff, tstamp):
7010         case bpf_ctx_range(struct __sk_buff, wire_len):
7011                 return false;
7012         }
7013
7014         if (type == BPF_WRITE) {
7015                 switch (off) {
7016                 case bpf_ctx_range(struct __sk_buff, tc_index):
7017                 case bpf_ctx_range(struct __sk_buff, priority):
7018                         break;
7019                 default:
7020                         return false;
7021                 }
7022         }
7023
7024         switch (off) {
7025         case bpf_ctx_range(struct __sk_buff, mark):
7026                 return false;
7027         case bpf_ctx_range(struct __sk_buff, data):
7028                 info->reg_type = PTR_TO_PACKET;
7029                 break;
7030         case bpf_ctx_range(struct __sk_buff, data_end):
7031                 info->reg_type = PTR_TO_PACKET_END;
7032                 break;
7033         }
7034
7035         return bpf_skb_is_valid_access(off, size, type, prog, info);
7036 }
7037
7038 static bool sk_msg_is_valid_access(int off, int size,
7039                                    enum bpf_access_type type,
7040                                    const struct bpf_prog *prog,
7041                                    struct bpf_insn_access_aux *info)
7042 {
7043         if (type == BPF_WRITE)
7044                 return false;
7045
7046         if (off % size != 0)
7047                 return false;
7048
7049         switch (off) {
7050         case offsetof(struct sk_msg_md, data):
7051                 info->reg_type = PTR_TO_PACKET;
7052                 if (size != sizeof(__u64))
7053                         return false;
7054                 break;
7055         case offsetof(struct sk_msg_md, data_end):
7056                 info->reg_type = PTR_TO_PACKET_END;
7057                 if (size != sizeof(__u64))
7058                         return false;
7059                 break;
7060         case bpf_ctx_range(struct sk_msg_md, family):
7061         case bpf_ctx_range(struct sk_msg_md, remote_ip4):
7062         case bpf_ctx_range(struct sk_msg_md, local_ip4):
7063         case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]):
7064         case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]):
7065         case bpf_ctx_range(struct sk_msg_md, remote_port):
7066         case bpf_ctx_range(struct sk_msg_md, local_port):
7067         case bpf_ctx_range(struct sk_msg_md, size):
7068                 if (size != sizeof(__u32))
7069                         return false;
7070                 break;
7071         default:
7072                 return false;
7073         }
7074         return true;
7075 }
7076
7077 static bool flow_dissector_is_valid_access(int off, int size,
7078                                            enum bpf_access_type type,
7079                                            const struct bpf_prog *prog,
7080                                            struct bpf_insn_access_aux *info)
7081 {
7082         const int size_default = sizeof(__u32);
7083
7084         if (off < 0 || off >= sizeof(struct __sk_buff))
7085                 return false;
7086
7087         if (type == BPF_WRITE)
7088                 return false;
7089
7090         switch (off) {
7091         case bpf_ctx_range(struct __sk_buff, data):
7092                 if (size != size_default)
7093                         return false;
7094                 info->reg_type = PTR_TO_PACKET;
7095                 return true;
7096         case bpf_ctx_range(struct __sk_buff, data_end):
7097                 if (size != size_default)
7098                         return false;
7099                 info->reg_type = PTR_TO_PACKET_END;
7100                 return true;
7101         case bpf_ctx_range_ptr(struct __sk_buff, flow_keys):
7102                 if (size != sizeof(__u64))
7103                         return false;
7104                 info->reg_type = PTR_TO_FLOW_KEYS;
7105                 return true;
7106         default:
7107                 return false;
7108         }
7109 }
7110
7111 static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type,
7112                                              const struct bpf_insn *si,
7113                                              struct bpf_insn *insn_buf,
7114                                              struct bpf_prog *prog,
7115                                              u32 *target_size)
7116
7117 {
7118         struct bpf_insn *insn = insn_buf;
7119
7120         switch (si->off) {
7121         case offsetof(struct __sk_buff, data):
7122                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data),
7123                                       si->dst_reg, si->src_reg,
7124                                       offsetof(struct bpf_flow_dissector, data));
7125                 break;
7126
7127         case offsetof(struct __sk_buff, data_end):
7128                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end),
7129                                       si->dst_reg, si->src_reg,
7130                                       offsetof(struct bpf_flow_dissector, data_end));
7131                 break;
7132
7133         case offsetof(struct __sk_buff, flow_keys):
7134                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys),
7135                                       si->dst_reg, si->src_reg,
7136                                       offsetof(struct bpf_flow_dissector, flow_keys));
7137                 break;
7138         }
7139
7140         return insn - insn_buf;
7141 }
7142
7143 static u32 bpf_convert_ctx_access(enum bpf_access_type type,
7144                                   const struct bpf_insn *si,
7145                                   struct bpf_insn *insn_buf,
7146                                   struct bpf_prog *prog, u32 *target_size)
7147 {
7148         struct bpf_insn *insn = insn_buf;
7149         int off;
7150
7151         switch (si->off) {
7152         case offsetof(struct __sk_buff, len):
7153                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
7154                                       bpf_target_off(struct sk_buff, len, 4,
7155                                                      target_size));
7156                 break;
7157
7158         case offsetof(struct __sk_buff, protocol):
7159                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
7160                                       bpf_target_off(struct sk_buff, protocol, 2,
7161                                                      target_size));
7162                 break;
7163
7164         case offsetof(struct __sk_buff, vlan_proto):
7165                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
7166                                       bpf_target_off(struct sk_buff, vlan_proto, 2,
7167                                                      target_size));
7168                 break;
7169
7170         case offsetof(struct __sk_buff, priority):
7171                 if (type == BPF_WRITE)
7172                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
7173                                               bpf_target_off(struct sk_buff, priority, 4,
7174                                                              target_size));
7175                 else
7176                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
7177                                               bpf_target_off(struct sk_buff, priority, 4,
7178                                                              target_size));
7179                 break;
7180
7181         case offsetof(struct __sk_buff, ingress_ifindex):
7182                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
7183                                       bpf_target_off(struct sk_buff, skb_iif, 4,
7184                                                      target_size));
7185                 break;
7186
7187         case offsetof(struct __sk_buff, ifindex):
7188                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
7189                                       si->dst_reg, si->src_reg,
7190                                       offsetof(struct sk_buff, dev));
7191                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
7192                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
7193                                       bpf_target_off(struct net_device, ifindex, 4,
7194                                                      target_size));
7195                 break;
7196
7197         case offsetof(struct __sk_buff, hash):
7198                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
7199                                       bpf_target_off(struct sk_buff, hash, 4,
7200                                                      target_size));
7201                 break;
7202
7203         case offsetof(struct __sk_buff, mark):
7204                 if (type == BPF_WRITE)
7205                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
7206                                               bpf_target_off(struct sk_buff, mark, 4,
7207                                                              target_size));
7208                 else
7209                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
7210                                               bpf_target_off(struct sk_buff, mark, 4,
7211                                                              target_size));
7212                 break;
7213
7214         case offsetof(struct __sk_buff, pkt_type):
7215                 *target_size = 1;
7216                 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
7217                                       PKT_TYPE_OFFSET());
7218                 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX);
7219 #ifdef __BIG_ENDIAN_BITFIELD
7220                 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5);
7221 #endif
7222                 break;
7223
7224         case offsetof(struct __sk_buff, queue_mapping):
7225                 if (type == BPF_WRITE) {
7226                         *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1);
7227                         *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
7228                                               bpf_target_off(struct sk_buff,
7229                                                              queue_mapping,
7230                                                              2, target_size));
7231                 } else {
7232                         *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
7233                                               bpf_target_off(struct sk_buff,
7234                                                              queue_mapping,
7235                                                              2, target_size));
7236                 }
7237                 break;
7238
7239         case offsetof(struct __sk_buff, vlan_present):
7240                 *target_size = 1;
7241                 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
7242                                       PKT_VLAN_PRESENT_OFFSET());
7243                 if (PKT_VLAN_PRESENT_BIT)
7244                         *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, PKT_VLAN_PRESENT_BIT);
7245                 if (PKT_VLAN_PRESENT_BIT < 7)
7246                         *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1);
7247                 break;
7248
7249         case offsetof(struct __sk_buff, vlan_tci):
7250                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
7251                                       bpf_target_off(struct sk_buff, vlan_tci, 2,
7252                                                      target_size));
7253                 break;
7254
7255         case offsetof(struct __sk_buff, cb[0]) ...
7256              offsetofend(struct __sk_buff, cb[4]) - 1:
7257                 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, data) < 20);
7258                 BUILD_BUG_ON((offsetof(struct sk_buff, cb) +
7259                               offsetof(struct qdisc_skb_cb, data)) %
7260                              sizeof(__u64));
7261
7262                 prog->cb_access = 1;
7263                 off  = si->off;
7264                 off -= offsetof(struct __sk_buff, cb[0]);
7265                 off += offsetof(struct sk_buff, cb);
7266                 off += offsetof(struct qdisc_skb_cb, data);
7267                 if (type == BPF_WRITE)
7268                         *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg,
7269                                               si->src_reg, off);
7270                 else
7271                         *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg,
7272                                               si->src_reg, off);
7273                 break;
7274
7275         case offsetof(struct __sk_buff, tc_classid):
7276                 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, tc_classid) != 2);
7277
7278                 off  = si->off;
7279                 off -= offsetof(struct __sk_buff, tc_classid);
7280                 off += offsetof(struct sk_buff, cb);
7281                 off += offsetof(struct qdisc_skb_cb, tc_classid);
7282                 *target_size = 2;
7283                 if (type == BPF_WRITE)
7284                         *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg,
7285                                               si->src_reg, off);
7286                 else
7287                         *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg,
7288                                               si->src_reg, off);
7289                 break;
7290
7291         case offsetof(struct __sk_buff, data):
7292                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
7293                                       si->dst_reg, si->src_reg,
7294                                       offsetof(struct sk_buff, data));
7295                 break;
7296
7297         case offsetof(struct __sk_buff, data_meta):
7298                 off  = si->off;
7299                 off -= offsetof(struct __sk_buff, data_meta);
7300                 off += offsetof(struct sk_buff, cb);
7301                 off += offsetof(struct bpf_skb_data_end, data_meta);
7302                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
7303                                       si->src_reg, off);
7304                 break;
7305
7306         case offsetof(struct __sk_buff, data_end):
7307                 off  = si->off;
7308                 off -= offsetof(struct __sk_buff, data_end);
7309                 off += offsetof(struct sk_buff, cb);
7310                 off += offsetof(struct bpf_skb_data_end, data_end);
7311                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
7312                                       si->src_reg, off);
7313                 break;
7314
7315         case offsetof(struct __sk_buff, tc_index):
7316 #ifdef CONFIG_NET_SCHED
7317                 if (type == BPF_WRITE)
7318                         *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
7319                                               bpf_target_off(struct sk_buff, tc_index, 2,
7320                                                              target_size));
7321                 else
7322                         *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
7323                                               bpf_target_off(struct sk_buff, tc_index, 2,
7324                                                              target_size));
7325 #else
7326                 *target_size = 2;
7327                 if (type == BPF_WRITE)
7328                         *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg);
7329                 else
7330                         *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
7331 #endif
7332                 break;
7333
7334         case offsetof(struct __sk_buff, napi_id):
7335 #if defined(CONFIG_NET_RX_BUSY_POLL)
7336                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
7337                                       bpf_target_off(struct sk_buff, napi_id, 4,
7338                                                      target_size));
7339                 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1);
7340                 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
7341 #else
7342                 *target_size = 4;
7343                 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
7344 #endif
7345                 break;
7346         case offsetof(struct __sk_buff, family):
7347                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2);
7348
7349                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
7350                                       si->dst_reg, si->src_reg,
7351                                       offsetof(struct sk_buff, sk));
7352                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
7353                                       bpf_target_off(struct sock_common,
7354                                                      skc_family,
7355                                                      2, target_size));
7356                 break;
7357         case offsetof(struct __sk_buff, remote_ip4):
7358                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4);
7359
7360                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
7361                                       si->dst_reg, si->src_reg,
7362                                       offsetof(struct sk_buff, sk));
7363                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
7364                                       bpf_target_off(struct sock_common,
7365                                                      skc_daddr,
7366                                                      4, target_size));
7367                 break;
7368         case offsetof(struct __sk_buff, local_ip4):
7369                 BUILD_BUG_ON(sizeof_field(struct sock_common,
7370                                           skc_rcv_saddr) != 4);
7371
7372                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
7373                                       si->dst_reg, si->src_reg,
7374                                       offsetof(struct sk_buff, sk));
7375                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
7376                                       bpf_target_off(struct sock_common,
7377                                                      skc_rcv_saddr,
7378                                                      4, target_size));
7379                 break;
7380         case offsetof(struct __sk_buff, remote_ip6[0]) ...
7381              offsetof(struct __sk_buff, remote_ip6[3]):
7382 #if IS_ENABLED(CONFIG_IPV6)
7383                 BUILD_BUG_ON(sizeof_field(struct sock_common,
7384                                           skc_v6_daddr.s6_addr32[0]) != 4);
7385
7386                 off = si->off;
7387                 off -= offsetof(struct __sk_buff, remote_ip6[0]);
7388
7389                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
7390                                       si->dst_reg, si->src_reg,
7391                                       offsetof(struct sk_buff, sk));
7392                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
7393                                       offsetof(struct sock_common,
7394                                                skc_v6_daddr.s6_addr32[0]) +
7395                                       off);
7396 #else
7397                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
7398 #endif
7399                 break;
7400         case offsetof(struct __sk_buff, local_ip6[0]) ...
7401              offsetof(struct __sk_buff, local_ip6[3]):
7402 #if IS_ENABLED(CONFIG_IPV6)
7403                 BUILD_BUG_ON(sizeof_field(struct sock_common,
7404                                           skc_v6_rcv_saddr.s6_addr32[0]) != 4);
7405
7406                 off = si->off;
7407                 off -= offsetof(struct __sk_buff, local_ip6[0]);
7408
7409                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
7410                                       si->dst_reg, si->src_reg,
7411                                       offsetof(struct sk_buff, sk));
7412                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
7413                                       offsetof(struct sock_common,
7414                                                skc_v6_rcv_saddr.s6_addr32[0]) +
7415                                       off);
7416 #else
7417                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
7418 #endif
7419                 break;
7420
7421         case offsetof(struct __sk_buff, remote_port):
7422                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2);
7423
7424                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
7425                                       si->dst_reg, si->src_reg,
7426                                       offsetof(struct sk_buff, sk));
7427                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
7428                                       bpf_target_off(struct sock_common,
7429                                                      skc_dport,
7430                                                      2, target_size));
7431 #ifndef __BIG_ENDIAN_BITFIELD
7432                 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
7433 #endif
7434                 break;
7435
7436         case offsetof(struct __sk_buff, local_port):
7437                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2);
7438
7439                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
7440                                       si->dst_reg, si->src_reg,
7441                                       offsetof(struct sk_buff, sk));
7442                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
7443                                       bpf_target_off(struct sock_common,
7444                                                      skc_num, 2, target_size));
7445                 break;
7446
7447         case offsetof(struct __sk_buff, tstamp):
7448                 BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8);
7449
7450                 if (type == BPF_WRITE)
7451                         *insn++ = BPF_STX_MEM(BPF_DW,
7452                                               si->dst_reg, si->src_reg,
7453                                               bpf_target_off(struct sk_buff,
7454                                                              tstamp, 8,
7455                                                              target_size));
7456                 else
7457                         *insn++ = BPF_LDX_MEM(BPF_DW,
7458                                               si->dst_reg, si->src_reg,
7459                                               bpf_target_off(struct sk_buff,
7460                                                              tstamp, 8,
7461                                                              target_size));
7462                 break;
7463
7464         case offsetof(struct __sk_buff, gso_segs):
7465                 /* si->dst_reg = skb_shinfo(SKB); */
7466 #ifdef NET_SKBUFF_DATA_USES_OFFSET
7467                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end),
7468                                       BPF_REG_AX, si->src_reg,
7469                                       offsetof(struct sk_buff, end));
7470                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head),
7471                                       si->dst_reg, si->src_reg,
7472                                       offsetof(struct sk_buff, head));
7473                 *insn++ = BPF_ALU64_REG(BPF_ADD, si->dst_reg, BPF_REG_AX);
7474 #else
7475                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end),
7476                                       si->dst_reg, si->src_reg,
7477                                       offsetof(struct sk_buff, end));
7478 #endif
7479                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs),
7480                                       si->dst_reg, si->dst_reg,
7481                                       bpf_target_off(struct skb_shared_info,
7482                                                      gso_segs, 2,
7483                                                      target_size));
7484                 break;
7485         case offsetof(struct __sk_buff, wire_len):
7486                 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, pkt_len) != 4);
7487
7488                 off = si->off;
7489                 off -= offsetof(struct __sk_buff, wire_len);
7490                 off += offsetof(struct sk_buff, cb);
7491                 off += offsetof(struct qdisc_skb_cb, pkt_len);
7492                 *target_size = 4;
7493                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off);
7494                 break;
7495
7496         case offsetof(struct __sk_buff, sk):
7497                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
7498                                       si->dst_reg, si->src_reg,
7499                                       offsetof(struct sk_buff, sk));
7500                 break;
7501         }
7502
7503         return insn - insn_buf;
7504 }
7505
7506 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
7507                                 const struct bpf_insn *si,
7508                                 struct bpf_insn *insn_buf,
7509                                 struct bpf_prog *prog, u32 *target_size)
7510 {
7511         struct bpf_insn *insn = insn_buf;
7512         int off;
7513
7514         switch (si->off) {
7515         case offsetof(struct bpf_sock, bound_dev_if):
7516                 BUILD_BUG_ON(sizeof_field(struct sock, sk_bound_dev_if) != 4);
7517
7518                 if (type == BPF_WRITE)
7519                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
7520                                         offsetof(struct sock, sk_bound_dev_if));
7521                 else
7522                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
7523                                       offsetof(struct sock, sk_bound_dev_if));
7524                 break;
7525
7526         case offsetof(struct bpf_sock, mark):
7527                 BUILD_BUG_ON(sizeof_field(struct sock, sk_mark) != 4);
7528
7529                 if (type == BPF_WRITE)
7530                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
7531                                         offsetof(struct sock, sk_mark));
7532                 else
7533                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
7534                                       offsetof(struct sock, sk_mark));
7535                 break;
7536
7537         case offsetof(struct bpf_sock, priority):
7538                 BUILD_BUG_ON(sizeof_field(struct sock, sk_priority) != 4);
7539
7540                 if (type == BPF_WRITE)
7541                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
7542                                         offsetof(struct sock, sk_priority));
7543                 else
7544                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
7545                                       offsetof(struct sock, sk_priority));
7546                 break;
7547
7548         case offsetof(struct bpf_sock, family):
7549                 *insn++ = BPF_LDX_MEM(
7550                         BPF_FIELD_SIZEOF(struct sock_common, skc_family),
7551                         si->dst_reg, si->src_reg,
7552                         bpf_target_off(struct sock_common,
7553                                        skc_family,
7554                                        sizeof_field(struct sock_common,
7555                                                     skc_family),
7556                                        target_size));
7557                 break;
7558
7559         case offsetof(struct bpf_sock, type):
7560                 *insn++ = BPF_LDX_MEM(
7561                         BPF_FIELD_SIZEOF(struct sock, sk_type),
7562                         si->dst_reg, si->src_reg,
7563                         bpf_target_off(struct sock, sk_type,
7564                                        sizeof_field(struct sock, sk_type),
7565                                        target_size));
7566                 break;
7567
7568         case offsetof(struct bpf_sock, protocol):
7569                 *insn++ = BPF_LDX_MEM(
7570                         BPF_FIELD_SIZEOF(struct sock, sk_protocol),
7571                         si->dst_reg, si->src_reg,
7572                         bpf_target_off(struct sock, sk_protocol,
7573                                        sizeof_field(struct sock, sk_protocol),
7574                                        target_size));
7575                 break;
7576
7577         case offsetof(struct bpf_sock, src_ip4):
7578                 *insn++ = BPF_LDX_MEM(
7579                         BPF_SIZE(si->code), si->dst_reg, si->src_reg,
7580                         bpf_target_off(struct sock_common, skc_rcv_saddr,
7581                                        sizeof_field(struct sock_common,
7582                                                     skc_rcv_saddr),
7583                                        target_size));
7584                 break;
7585
7586         case offsetof(struct bpf_sock, dst_ip4):
7587                 *insn++ = BPF_LDX_MEM(
7588                         BPF_SIZE(si->code), si->dst_reg, si->src_reg,
7589                         bpf_target_off(struct sock_common, skc_daddr,
7590                                        sizeof_field(struct sock_common,
7591                                                     skc_daddr),
7592                                        target_size));
7593                 break;
7594
7595         case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
7596 #if IS_ENABLED(CONFIG_IPV6)
7597                 off = si->off;
7598                 off -= offsetof(struct bpf_sock, src_ip6[0]);
7599                 *insn++ = BPF_LDX_MEM(
7600                         BPF_SIZE(si->code), si->dst_reg, si->src_reg,
7601                         bpf_target_off(
7602                                 struct sock_common,
7603                                 skc_v6_rcv_saddr.s6_addr32[0],
7604                                 sizeof_field(struct sock_common,
7605                                              skc_v6_rcv_saddr.s6_addr32[0]),
7606                                 target_size) + off);
7607 #else
7608                 (void)off;
7609                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
7610 #endif
7611                 break;
7612
7613         case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]):
7614 #if IS_ENABLED(CONFIG_IPV6)
7615                 off = si->off;
7616                 off -= offsetof(struct bpf_sock, dst_ip6[0]);
7617                 *insn++ = BPF_LDX_MEM(
7618                         BPF_SIZE(si->code), si->dst_reg, si->src_reg,
7619                         bpf_target_off(struct sock_common,
7620                                        skc_v6_daddr.s6_addr32[0],
7621                                        sizeof_field(struct sock_common,
7622                                                     skc_v6_daddr.s6_addr32[0]),
7623                                        target_size) + off);
7624 #else
7625                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
7626                 *target_size = 4;
7627 #endif
7628                 break;
7629
7630         case offsetof(struct bpf_sock, src_port):
7631                 *insn++ = BPF_LDX_MEM(
7632                         BPF_FIELD_SIZEOF(struct sock_common, skc_num),
7633                         si->dst_reg, si->src_reg,
7634                         bpf_target_off(struct sock_common, skc_num,
7635                                        sizeof_field(struct sock_common,
7636                                                     skc_num),
7637                                        target_size));
7638                 break;
7639
7640         case offsetof(struct bpf_sock, dst_port):
7641                 *insn++ = BPF_LDX_MEM(
7642                         BPF_FIELD_SIZEOF(struct sock_common, skc_dport),
7643                         si->dst_reg, si->src_reg,
7644                         bpf_target_off(struct sock_common, skc_dport,
7645                                        sizeof_field(struct sock_common,
7646                                                     skc_dport),
7647                                        target_size));
7648                 break;
7649
7650         case offsetof(struct bpf_sock, state):
7651                 *insn++ = BPF_LDX_MEM(
7652                         BPF_FIELD_SIZEOF(struct sock_common, skc_state),
7653                         si->dst_reg, si->src_reg,
7654                         bpf_target_off(struct sock_common, skc_state,
7655                                        sizeof_field(struct sock_common,
7656                                                     skc_state),
7657                                        target_size));
7658                 break;
7659         }
7660
7661         return insn - insn_buf;
7662 }
7663
7664 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type,
7665                                          const struct bpf_insn *si,
7666                                          struct bpf_insn *insn_buf,
7667                                          struct bpf_prog *prog, u32 *target_size)
7668 {
7669         struct bpf_insn *insn = insn_buf;
7670
7671         switch (si->off) {
7672         case offsetof(struct __sk_buff, ifindex):
7673                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
7674                                       si->dst_reg, si->src_reg,
7675                                       offsetof(struct sk_buff, dev));
7676                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
7677                                       bpf_target_off(struct net_device, ifindex, 4,
7678                                                      target_size));
7679                 break;
7680         default:
7681                 return bpf_convert_ctx_access(type, si, insn_buf, prog,
7682                                               target_size);
7683         }
7684
7685         return insn - insn_buf;
7686 }
7687
7688 static u32 xdp_convert_ctx_access(enum bpf_access_type type,
7689                                   const struct bpf_insn *si,
7690                                   struct bpf_insn *insn_buf,
7691                                   struct bpf_prog *prog, u32 *target_size)
7692 {
7693         struct bpf_insn *insn = insn_buf;
7694
7695         switch (si->off) {
7696         case offsetof(struct xdp_md, data):
7697                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data),
7698                                       si->dst_reg, si->src_reg,
7699                                       offsetof(struct xdp_buff, data));
7700                 break;
7701         case offsetof(struct xdp_md, data_meta):
7702                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta),
7703                                       si->dst_reg, si->src_reg,
7704                                       offsetof(struct xdp_buff, data_meta));
7705                 break;
7706         case offsetof(struct xdp_md, data_end):
7707                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end),
7708                                       si->dst_reg, si->src_reg,
7709                                       offsetof(struct xdp_buff, data_end));
7710                 break;
7711         case offsetof(struct xdp_md, ingress_ifindex):
7712                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
7713                                       si->dst_reg, si->src_reg,
7714                                       offsetof(struct xdp_buff, rxq));
7715                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev),
7716                                       si->dst_reg, si->dst_reg,
7717                                       offsetof(struct xdp_rxq_info, dev));
7718                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
7719                                       offsetof(struct net_device, ifindex));
7720                 break;
7721         case offsetof(struct xdp_md, rx_queue_index):
7722                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
7723                                       si->dst_reg, si->src_reg,
7724                                       offsetof(struct xdp_buff, rxq));
7725                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
7726                                       offsetof(struct xdp_rxq_info,
7727                                                queue_index));
7728                 break;
7729         }
7730
7731         return insn - insn_buf;
7732 }
7733
7734 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of
7735  * context Structure, F is Field in context structure that contains a pointer
7736  * to Nested Structure of type NS that has the field NF.
7737  *
7738  * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make
7739  * sure that SIZE is not greater than actual size of S.F.NF.
7740  *
7741  * If offset OFF is provided, the load happens from that offset relative to
7742  * offset of NF.
7743  */
7744 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF)          \
7745         do {                                                                   \
7746                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg,     \
7747                                       si->src_reg, offsetof(S, F));            \
7748                 *insn++ = BPF_LDX_MEM(                                         \
7749                         SIZE, si->dst_reg, si->dst_reg,                        \
7750                         bpf_target_off(NS, NF, sizeof_field(NS, NF),           \
7751                                        target_size)                            \
7752                                 + OFF);                                        \
7753         } while (0)
7754
7755 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF)                              \
7756         SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF,                     \
7757                                              BPF_FIELD_SIZEOF(NS, NF), 0)
7758
7759 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to
7760  * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation.
7761  *
7762  * In addition it uses Temporary Field TF (member of struct S) as the 3rd
7763  * "register" since two registers available in convert_ctx_access are not
7764  * enough: we can't override neither SRC, since it contains value to store, nor
7765  * DST since it contains pointer to context that may be used by later
7766  * instructions. But we need a temporary place to save pointer to nested
7767  * structure whose field we want to store to.
7768  */
7769 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF)          \
7770         do {                                                                   \
7771                 int tmp_reg = BPF_REG_9;                                       \
7772                 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg)          \
7773                         --tmp_reg;                                             \
7774                 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg)          \
7775                         --tmp_reg;                                             \
7776                 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg,            \
7777                                       offsetof(S, TF));                        \
7778                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg,         \
7779                                       si->dst_reg, offsetof(S, F));            \
7780                 *insn++ = BPF_STX_MEM(SIZE, tmp_reg, si->src_reg,              \
7781                         bpf_target_off(NS, NF, sizeof_field(NS, NF),           \
7782                                        target_size)                            \
7783                                 + OFF);                                        \
7784                 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg,            \
7785                                       offsetof(S, TF));                        \
7786         } while (0)
7787
7788 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \
7789                                                       TF)                      \
7790         do {                                                                   \
7791                 if (type == BPF_WRITE) {                                       \
7792                         SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE,   \
7793                                                          OFF, TF);             \
7794                 } else {                                                       \
7795                         SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(                  \
7796                                 S, NS, F, NF, SIZE, OFF);  \
7797                 }                                                              \
7798         } while (0)
7799
7800 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF)                 \
7801         SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(                         \
7802                 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF)
7803
7804 static u32 sock_addr_convert_ctx_access(enum bpf_access_type type,
7805                                         const struct bpf_insn *si,
7806                                         struct bpf_insn *insn_buf,
7807                                         struct bpf_prog *prog, u32 *target_size)
7808 {
7809         struct bpf_insn *insn = insn_buf;
7810         int off;
7811
7812         switch (si->off) {
7813         case offsetof(struct bpf_sock_addr, user_family):
7814                 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
7815                                             struct sockaddr, uaddr, sa_family);
7816                 break;
7817
7818         case offsetof(struct bpf_sock_addr, user_ip4):
7819                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
7820                         struct bpf_sock_addr_kern, struct sockaddr_in, uaddr,
7821                         sin_addr, BPF_SIZE(si->code), 0, tmp_reg);
7822                 break;
7823
7824         case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
7825                 off = si->off;
7826                 off -= offsetof(struct bpf_sock_addr, user_ip6[0]);
7827                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
7828                         struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr,
7829                         sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off,
7830                         tmp_reg);
7831                 break;
7832
7833         case offsetof(struct bpf_sock_addr, user_port):
7834                 /* To get port we need to know sa_family first and then treat
7835                  * sockaddr as either sockaddr_in or sockaddr_in6.
7836                  * Though we can simplify since port field has same offset and
7837                  * size in both structures.
7838                  * Here we check this invariant and use just one of the
7839                  * structures if it's true.
7840                  */
7841                 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) !=
7842                              offsetof(struct sockaddr_in6, sin6_port));
7843                 BUILD_BUG_ON(sizeof_field(struct sockaddr_in, sin_port) !=
7844                              sizeof_field(struct sockaddr_in6, sin6_port));
7845                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(struct bpf_sock_addr_kern,
7846                                                      struct sockaddr_in6, uaddr,
7847                                                      sin6_port, tmp_reg);
7848                 break;
7849
7850         case offsetof(struct bpf_sock_addr, family):
7851                 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
7852                                             struct sock, sk, sk_family);
7853                 break;
7854
7855         case offsetof(struct bpf_sock_addr, type):
7856                 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
7857                                             struct sock, sk, sk_type);
7858                 break;
7859
7860         case offsetof(struct bpf_sock_addr, protocol):
7861                 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
7862                                             struct sock, sk, sk_protocol);
7863                 break;
7864
7865         case offsetof(struct bpf_sock_addr, msg_src_ip4):
7866                 /* Treat t_ctx as struct in_addr for msg_src_ip4. */
7867                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
7868                         struct bpf_sock_addr_kern, struct in_addr, t_ctx,
7869                         s_addr, BPF_SIZE(si->code), 0, tmp_reg);
7870                 break;
7871
7872         case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
7873                                 msg_src_ip6[3]):
7874                 off = si->off;
7875                 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]);
7876                 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */
7877                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
7878                         struct bpf_sock_addr_kern, struct in6_addr, t_ctx,
7879                         s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg);
7880                 break;
7881         case offsetof(struct bpf_sock_addr, sk):
7882                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk),
7883                                       si->dst_reg, si->src_reg,
7884                                       offsetof(struct bpf_sock_addr_kern, sk));
7885                 break;
7886         }
7887
7888         return insn - insn_buf;
7889 }
7890
7891 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
7892                                        const struct bpf_insn *si,
7893                                        struct bpf_insn *insn_buf,
7894                                        struct bpf_prog *prog,
7895                                        u32 *target_size)
7896 {
7897         struct bpf_insn *insn = insn_buf;
7898         int off;
7899
7900 /* Helper macro for adding read access to tcp_sock or sock fields. */
7901 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ)                         \
7902         do {                                                                  \
7903                 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) >                   \
7904                              sizeof_field(struct bpf_sock_ops, BPF_FIELD));   \
7905                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
7906                                                 struct bpf_sock_ops_kern,     \
7907                                                 is_fullsock),                 \
7908                                       si->dst_reg, si->src_reg,               \
7909                                       offsetof(struct bpf_sock_ops_kern,      \
7910                                                is_fullsock));                 \
7911                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 2);            \
7912                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
7913                                                 struct bpf_sock_ops_kern, sk),\
7914                                       si->dst_reg, si->src_reg,               \
7915                                       offsetof(struct bpf_sock_ops_kern, sk));\
7916                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ,                   \
7917                                                        OBJ_FIELD),            \
7918                                       si->dst_reg, si->dst_reg,               \
7919                                       offsetof(OBJ, OBJ_FIELD));              \
7920         } while (0)
7921
7922 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \
7923                 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock)
7924
7925 /* Helper macro for adding write access to tcp_sock or sock fields.
7926  * The macro is called with two registers, dst_reg which contains a pointer
7927  * to ctx (context) and src_reg which contains the value that should be
7928  * stored. However, we need an additional register since we cannot overwrite
7929  * dst_reg because it may be used later in the program.
7930  * Instead we "borrow" one of the other register. We first save its value
7931  * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore
7932  * it at the end of the macro.
7933  */
7934 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ)                         \
7935         do {                                                                  \
7936                 int reg = BPF_REG_9;                                          \
7937                 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) >                   \
7938                              sizeof_field(struct bpf_sock_ops, BPF_FIELD));   \
7939                 if (si->dst_reg == reg || si->src_reg == reg)                 \
7940                         reg--;                                                \
7941                 if (si->dst_reg == reg || si->src_reg == reg)                 \
7942                         reg--;                                                \
7943                 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg,               \
7944                                       offsetof(struct bpf_sock_ops_kern,      \
7945                                                temp));                        \
7946                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
7947                                                 struct bpf_sock_ops_kern,     \
7948                                                 is_fullsock),                 \
7949                                       reg, si->dst_reg,                       \
7950                                       offsetof(struct bpf_sock_ops_kern,      \
7951                                                is_fullsock));                 \
7952                 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2);                    \
7953                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
7954                                                 struct bpf_sock_ops_kern, sk),\
7955                                       reg, si->dst_reg,                       \
7956                                       offsetof(struct bpf_sock_ops_kern, sk));\
7957                 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD),       \
7958                                       reg, si->src_reg,                       \
7959                                       offsetof(OBJ, OBJ_FIELD));              \
7960                 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg,               \
7961                                       offsetof(struct bpf_sock_ops_kern,      \
7962                                                temp));                        \
7963         } while (0)
7964
7965 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE)            \
7966         do {                                                                  \
7967                 if (TYPE == BPF_WRITE)                                        \
7968                         SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ);        \
7969                 else                                                          \
7970                         SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ);        \
7971         } while (0)
7972
7973         if (insn > insn_buf)
7974                 return insn - insn_buf;
7975
7976         switch (si->off) {
7977         case offsetof(struct bpf_sock_ops, op) ...
7978              offsetof(struct bpf_sock_ops, replylong[3]):
7979                 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, op) !=
7980                              sizeof_field(struct bpf_sock_ops_kern, op));
7981                 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) !=
7982                              sizeof_field(struct bpf_sock_ops_kern, reply));
7983                 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) !=
7984                              sizeof_field(struct bpf_sock_ops_kern, replylong));
7985                 off = si->off;
7986                 off -= offsetof(struct bpf_sock_ops, op);
7987                 off += offsetof(struct bpf_sock_ops_kern, op);
7988                 if (type == BPF_WRITE)
7989                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
7990                                               off);
7991                 else
7992                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
7993                                               off);
7994                 break;
7995
7996         case offsetof(struct bpf_sock_ops, family):
7997                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2);
7998
7999                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8000                                               struct bpf_sock_ops_kern, sk),
8001                                       si->dst_reg, si->src_reg,
8002                                       offsetof(struct bpf_sock_ops_kern, sk));
8003                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
8004                                       offsetof(struct sock_common, skc_family));
8005                 break;
8006
8007         case offsetof(struct bpf_sock_ops, remote_ip4):
8008                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4);
8009
8010                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8011                                                 struct bpf_sock_ops_kern, sk),
8012                                       si->dst_reg, si->src_reg,
8013                                       offsetof(struct bpf_sock_ops_kern, sk));
8014                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8015                                       offsetof(struct sock_common, skc_daddr));
8016                 break;
8017
8018         case offsetof(struct bpf_sock_ops, local_ip4):
8019                 BUILD_BUG_ON(sizeof_field(struct sock_common,
8020                                           skc_rcv_saddr) != 4);
8021
8022                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8023                                               struct bpf_sock_ops_kern, sk),
8024                                       si->dst_reg, si->src_reg,
8025                                       offsetof(struct bpf_sock_ops_kern, sk));
8026                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8027                                       offsetof(struct sock_common,
8028                                                skc_rcv_saddr));
8029                 break;
8030
8031         case offsetof(struct bpf_sock_ops, remote_ip6[0]) ...
8032              offsetof(struct bpf_sock_ops, remote_ip6[3]):
8033 #if IS_ENABLED(CONFIG_IPV6)
8034                 BUILD_BUG_ON(sizeof_field(struct sock_common,
8035                                           skc_v6_daddr.s6_addr32[0]) != 4);
8036
8037                 off = si->off;
8038                 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]);
8039                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8040                                                 struct bpf_sock_ops_kern, sk),
8041                                       si->dst_reg, si->src_reg,
8042                                       offsetof(struct bpf_sock_ops_kern, sk));
8043                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8044                                       offsetof(struct sock_common,
8045                                                skc_v6_daddr.s6_addr32[0]) +
8046                                       off);
8047 #else
8048                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
8049 #endif
8050                 break;
8051
8052         case offsetof(struct bpf_sock_ops, local_ip6[0]) ...
8053              offsetof(struct bpf_sock_ops, local_ip6[3]):
8054 #if IS_ENABLED(CONFIG_IPV6)
8055                 BUILD_BUG_ON(sizeof_field(struct sock_common,
8056                                           skc_v6_rcv_saddr.s6_addr32[0]) != 4);
8057
8058                 off = si->off;
8059                 off -= offsetof(struct bpf_sock_ops, local_ip6[0]);
8060                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8061                                                 struct bpf_sock_ops_kern, sk),
8062                                       si->dst_reg, si->src_reg,
8063                                       offsetof(struct bpf_sock_ops_kern, sk));
8064                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8065                                       offsetof(struct sock_common,
8066                                                skc_v6_rcv_saddr.s6_addr32[0]) +
8067                                       off);
8068 #else
8069                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
8070 #endif
8071                 break;
8072
8073         case offsetof(struct bpf_sock_ops, remote_port):
8074                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2);
8075
8076                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8077                                                 struct bpf_sock_ops_kern, sk),
8078                                       si->dst_reg, si->src_reg,
8079                                       offsetof(struct bpf_sock_ops_kern, sk));
8080                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
8081                                       offsetof(struct sock_common, skc_dport));
8082 #ifndef __BIG_ENDIAN_BITFIELD
8083                 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
8084 #endif
8085                 break;
8086
8087         case offsetof(struct bpf_sock_ops, local_port):
8088                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2);
8089
8090                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8091                                                 struct bpf_sock_ops_kern, sk),
8092                                       si->dst_reg, si->src_reg,
8093                                       offsetof(struct bpf_sock_ops_kern, sk));
8094                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
8095                                       offsetof(struct sock_common, skc_num));
8096                 break;
8097
8098         case offsetof(struct bpf_sock_ops, is_fullsock):
8099                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8100                                                 struct bpf_sock_ops_kern,
8101                                                 is_fullsock),
8102                                       si->dst_reg, si->src_reg,
8103                                       offsetof(struct bpf_sock_ops_kern,
8104                                                is_fullsock));
8105                 break;
8106
8107         case offsetof(struct bpf_sock_ops, state):
8108                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_state) != 1);
8109
8110                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8111                                                 struct bpf_sock_ops_kern, sk),
8112                                       si->dst_reg, si->src_reg,
8113                                       offsetof(struct bpf_sock_ops_kern, sk));
8114                 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg,
8115                                       offsetof(struct sock_common, skc_state));
8116                 break;
8117
8118         case offsetof(struct bpf_sock_ops, rtt_min):
8119                 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) !=
8120                              sizeof(struct minmax));
8121                 BUILD_BUG_ON(sizeof(struct minmax) <
8122                              sizeof(struct minmax_sample));
8123
8124                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8125                                                 struct bpf_sock_ops_kern, sk),
8126                                       si->dst_reg, si->src_reg,
8127                                       offsetof(struct bpf_sock_ops_kern, sk));
8128                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8129                                       offsetof(struct tcp_sock, rtt_min) +
8130                                       sizeof_field(struct minmax_sample, t));
8131                 break;
8132
8133         case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags):
8134                 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags,
8135                                    struct tcp_sock);
8136                 break;
8137
8138         case offsetof(struct bpf_sock_ops, sk_txhash):
8139                 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash,
8140                                           struct sock, type);
8141                 break;
8142         case offsetof(struct bpf_sock_ops, snd_cwnd):
8143                 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd);
8144                 break;
8145         case offsetof(struct bpf_sock_ops, srtt_us):
8146                 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us);
8147                 break;
8148         case offsetof(struct bpf_sock_ops, snd_ssthresh):
8149                 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh);
8150                 break;
8151         case offsetof(struct bpf_sock_ops, rcv_nxt):
8152                 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt);
8153                 break;
8154         case offsetof(struct bpf_sock_ops, snd_nxt):
8155                 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt);
8156                 break;
8157         case offsetof(struct bpf_sock_ops, snd_una):
8158                 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una);
8159                 break;
8160         case offsetof(struct bpf_sock_ops, mss_cache):
8161                 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache);
8162                 break;
8163         case offsetof(struct bpf_sock_ops, ecn_flags):
8164                 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags);
8165                 break;
8166         case offsetof(struct bpf_sock_ops, rate_delivered):
8167                 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered);
8168                 break;
8169         case offsetof(struct bpf_sock_ops, rate_interval_us):
8170                 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us);
8171                 break;
8172         case offsetof(struct bpf_sock_ops, packets_out):
8173                 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out);
8174                 break;
8175         case offsetof(struct bpf_sock_ops, retrans_out):
8176                 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out);
8177                 break;
8178         case offsetof(struct bpf_sock_ops, total_retrans):
8179                 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans);
8180                 break;
8181         case offsetof(struct bpf_sock_ops, segs_in):
8182                 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in);
8183                 break;
8184         case offsetof(struct bpf_sock_ops, data_segs_in):
8185                 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in);
8186                 break;
8187         case offsetof(struct bpf_sock_ops, segs_out):
8188                 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out);
8189                 break;
8190         case offsetof(struct bpf_sock_ops, data_segs_out):
8191                 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out);
8192                 break;
8193         case offsetof(struct bpf_sock_ops, lost_out):
8194                 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out);
8195                 break;
8196         case offsetof(struct bpf_sock_ops, sacked_out):
8197                 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out);
8198                 break;
8199         case offsetof(struct bpf_sock_ops, bytes_received):
8200                 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received);
8201                 break;
8202         case offsetof(struct bpf_sock_ops, bytes_acked):
8203                 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked);
8204                 break;
8205         case offsetof(struct bpf_sock_ops, sk):
8206                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8207                                                 struct bpf_sock_ops_kern,
8208                                                 is_fullsock),
8209                                       si->dst_reg, si->src_reg,
8210                                       offsetof(struct bpf_sock_ops_kern,
8211                                                is_fullsock));
8212                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
8213                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8214                                                 struct bpf_sock_ops_kern, sk),
8215                                       si->dst_reg, si->src_reg,
8216                                       offsetof(struct bpf_sock_ops_kern, sk));
8217                 break;
8218         }
8219         return insn - insn_buf;
8220 }
8221
8222 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type,
8223                                      const struct bpf_insn *si,
8224                                      struct bpf_insn *insn_buf,
8225                                      struct bpf_prog *prog, u32 *target_size)
8226 {
8227         struct bpf_insn *insn = insn_buf;
8228         int off;
8229
8230         switch (si->off) {
8231         case offsetof(struct __sk_buff, data_end):
8232                 off  = si->off;
8233                 off -= offsetof(struct __sk_buff, data_end);
8234                 off += offsetof(struct sk_buff, cb);
8235                 off += offsetof(struct tcp_skb_cb, bpf.data_end);
8236                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
8237                                       si->src_reg, off);
8238                 break;
8239         default:
8240                 return bpf_convert_ctx_access(type, si, insn_buf, prog,
8241                                               target_size);
8242         }
8243
8244         return insn - insn_buf;
8245 }
8246
8247 static u32 sk_msg_convert_ctx_access(enum bpf_access_type type,
8248                                      const struct bpf_insn *si,
8249                                      struct bpf_insn *insn_buf,
8250                                      struct bpf_prog *prog, u32 *target_size)
8251 {
8252         struct bpf_insn *insn = insn_buf;
8253 #if IS_ENABLED(CONFIG_IPV6)
8254         int off;
8255 #endif
8256
8257         /* convert ctx uses the fact sg element is first in struct */
8258         BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0);
8259
8260         switch (si->off) {
8261         case offsetof(struct sk_msg_md, data):
8262                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data),
8263                                       si->dst_reg, si->src_reg,
8264                                       offsetof(struct sk_msg, data));
8265                 break;
8266         case offsetof(struct sk_msg_md, data_end):
8267                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end),
8268                                       si->dst_reg, si->src_reg,
8269                                       offsetof(struct sk_msg, data_end));
8270                 break;
8271         case offsetof(struct sk_msg_md, family):
8272                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2);
8273
8274                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8275                                               struct sk_msg, sk),
8276                                       si->dst_reg, si->src_reg,
8277                                       offsetof(struct sk_msg, sk));
8278                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
8279                                       offsetof(struct sock_common, skc_family));
8280                 break;
8281
8282         case offsetof(struct sk_msg_md, remote_ip4):
8283                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4);
8284
8285                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8286                                                 struct sk_msg, sk),
8287                                       si->dst_reg, si->src_reg,
8288                                       offsetof(struct sk_msg, sk));
8289                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8290                                       offsetof(struct sock_common, skc_daddr));
8291                 break;
8292
8293         case offsetof(struct sk_msg_md, local_ip4):
8294                 BUILD_BUG_ON(sizeof_field(struct sock_common,
8295                                           skc_rcv_saddr) != 4);
8296
8297                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8298                                               struct sk_msg, sk),
8299                                       si->dst_reg, si->src_reg,
8300                                       offsetof(struct sk_msg, sk));
8301                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8302                                       offsetof(struct sock_common,
8303                                                skc_rcv_saddr));
8304                 break;
8305
8306         case offsetof(struct sk_msg_md, remote_ip6[0]) ...
8307              offsetof(struct sk_msg_md, remote_ip6[3]):
8308 #if IS_ENABLED(CONFIG_IPV6)
8309                 BUILD_BUG_ON(sizeof_field(struct sock_common,
8310                                           skc_v6_daddr.s6_addr32[0]) != 4);
8311
8312                 off = si->off;
8313                 off -= offsetof(struct sk_msg_md, remote_ip6[0]);
8314                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8315                                                 struct sk_msg, sk),
8316                                       si->dst_reg, si->src_reg,
8317                                       offsetof(struct sk_msg, sk));
8318                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8319                                       offsetof(struct sock_common,
8320                                                skc_v6_daddr.s6_addr32[0]) +
8321                                       off);
8322 #else
8323                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
8324 #endif
8325                 break;
8326
8327         case offsetof(struct sk_msg_md, local_ip6[0]) ...
8328              offsetof(struct sk_msg_md, local_ip6[3]):
8329 #if IS_ENABLED(CONFIG_IPV6)
8330                 BUILD_BUG_ON(sizeof_field(struct sock_common,
8331                                           skc_v6_rcv_saddr.s6_addr32[0]) != 4);
8332
8333                 off = si->off;
8334                 off -= offsetof(struct sk_msg_md, local_ip6[0]);
8335                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8336                                                 struct sk_msg, sk),
8337                                       si->dst_reg, si->src_reg,
8338                                       offsetof(struct sk_msg, sk));
8339                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8340                                       offsetof(struct sock_common,
8341                                                skc_v6_rcv_saddr.s6_addr32[0]) +
8342                                       off);
8343 #else
8344                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
8345 #endif
8346                 break;
8347
8348         case offsetof(struct sk_msg_md, remote_port):
8349                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2);
8350
8351                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8352                                                 struct sk_msg, sk),
8353                                       si->dst_reg, si->src_reg,
8354                                       offsetof(struct sk_msg, sk));
8355                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
8356                                       offsetof(struct sock_common, skc_dport));
8357 #ifndef __BIG_ENDIAN_BITFIELD
8358                 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
8359 #endif
8360                 break;
8361
8362         case offsetof(struct sk_msg_md, local_port):
8363                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2);
8364
8365                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
8366                                                 struct sk_msg, sk),
8367                                       si->dst_reg, si->src_reg,
8368                                       offsetof(struct sk_msg, sk));
8369                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
8370                                       offsetof(struct sock_common, skc_num));
8371                 break;
8372
8373         case offsetof(struct sk_msg_md, size):
8374                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size),
8375                                       si->dst_reg, si->src_reg,
8376                                       offsetof(struct sk_msg_sg, size));
8377                 break;
8378         }
8379
8380         return insn - insn_buf;
8381 }
8382
8383 const struct bpf_verifier_ops sk_filter_verifier_ops = {
8384         .get_func_proto         = sk_filter_func_proto,
8385         .is_valid_access        = sk_filter_is_valid_access,
8386         .convert_ctx_access     = bpf_convert_ctx_access,
8387         .gen_ld_abs             = bpf_gen_ld_abs,
8388 };
8389
8390 const struct bpf_prog_ops sk_filter_prog_ops = {
8391         .test_run               = bpf_prog_test_run_skb,
8392 };
8393
8394 const struct bpf_verifier_ops tc_cls_act_verifier_ops = {
8395         .get_func_proto         = tc_cls_act_func_proto,
8396         .is_valid_access        = tc_cls_act_is_valid_access,
8397         .convert_ctx_access     = tc_cls_act_convert_ctx_access,
8398         .gen_prologue           = tc_cls_act_prologue,
8399         .gen_ld_abs             = bpf_gen_ld_abs,
8400 };
8401
8402 const struct bpf_prog_ops tc_cls_act_prog_ops = {
8403         .test_run               = bpf_prog_test_run_skb,
8404 };
8405
8406 const struct bpf_verifier_ops xdp_verifier_ops = {
8407         .get_func_proto         = xdp_func_proto,
8408         .is_valid_access        = xdp_is_valid_access,
8409         .convert_ctx_access     = xdp_convert_ctx_access,
8410         .gen_prologue           = bpf_noop_prologue,
8411 };
8412
8413 const struct bpf_prog_ops xdp_prog_ops = {
8414         .test_run               = bpf_prog_test_run_xdp,
8415 };
8416
8417 const struct bpf_verifier_ops cg_skb_verifier_ops = {
8418         .get_func_proto         = cg_skb_func_proto,
8419         .is_valid_access        = cg_skb_is_valid_access,
8420         .convert_ctx_access     = bpf_convert_ctx_access,
8421 };
8422
8423 const struct bpf_prog_ops cg_skb_prog_ops = {
8424         .test_run               = bpf_prog_test_run_skb,
8425 };
8426
8427 const struct bpf_verifier_ops lwt_in_verifier_ops = {
8428         .get_func_proto         = lwt_in_func_proto,
8429         .is_valid_access        = lwt_is_valid_access,
8430         .convert_ctx_access     = bpf_convert_ctx_access,
8431 };
8432
8433 const struct bpf_prog_ops lwt_in_prog_ops = {
8434         .test_run               = bpf_prog_test_run_skb,
8435 };
8436
8437 const struct bpf_verifier_ops lwt_out_verifier_ops = {
8438         .get_func_proto         = lwt_out_func_proto,
8439         .is_valid_access        = lwt_is_valid_access,
8440         .convert_ctx_access     = bpf_convert_ctx_access,
8441 };
8442
8443 const struct bpf_prog_ops lwt_out_prog_ops = {
8444         .test_run               = bpf_prog_test_run_skb,
8445 };
8446
8447 const struct bpf_verifier_ops lwt_xmit_verifier_ops = {
8448         .get_func_proto         = lwt_xmit_func_proto,
8449         .is_valid_access        = lwt_is_valid_access,
8450         .convert_ctx_access     = bpf_convert_ctx_access,
8451         .gen_prologue           = tc_cls_act_prologue,
8452 };
8453
8454 const struct bpf_prog_ops lwt_xmit_prog_ops = {
8455         .test_run               = bpf_prog_test_run_skb,
8456 };
8457
8458 const struct bpf_verifier_ops lwt_seg6local_verifier_ops = {
8459         .get_func_proto         = lwt_seg6local_func_proto,
8460         .is_valid_access        = lwt_is_valid_access,
8461         .convert_ctx_access     = bpf_convert_ctx_access,
8462 };
8463
8464 const struct bpf_prog_ops lwt_seg6local_prog_ops = {
8465         .test_run               = bpf_prog_test_run_skb,
8466 };
8467
8468 const struct bpf_verifier_ops cg_sock_verifier_ops = {
8469         .get_func_proto         = sock_filter_func_proto,
8470         .is_valid_access        = sock_filter_is_valid_access,
8471         .convert_ctx_access     = bpf_sock_convert_ctx_access,
8472 };
8473
8474 const struct bpf_prog_ops cg_sock_prog_ops = {
8475 };
8476
8477 const struct bpf_verifier_ops cg_sock_addr_verifier_ops = {
8478         .get_func_proto         = sock_addr_func_proto,
8479         .is_valid_access        = sock_addr_is_valid_access,
8480         .convert_ctx_access     = sock_addr_convert_ctx_access,
8481 };
8482
8483 const struct bpf_prog_ops cg_sock_addr_prog_ops = {
8484 };
8485
8486 const struct bpf_verifier_ops sock_ops_verifier_ops = {
8487         .get_func_proto         = sock_ops_func_proto,
8488         .is_valid_access        = sock_ops_is_valid_access,
8489         .convert_ctx_access     = sock_ops_convert_ctx_access,
8490 };
8491
8492 const struct bpf_prog_ops sock_ops_prog_ops = {
8493 };
8494
8495 const struct bpf_verifier_ops sk_skb_verifier_ops = {
8496         .get_func_proto         = sk_skb_func_proto,
8497         .is_valid_access        = sk_skb_is_valid_access,
8498         .convert_ctx_access     = sk_skb_convert_ctx_access,
8499         .gen_prologue           = sk_skb_prologue,
8500 };
8501
8502 const struct bpf_prog_ops sk_skb_prog_ops = {
8503 };
8504
8505 const struct bpf_verifier_ops sk_msg_verifier_ops = {
8506         .get_func_proto         = sk_msg_func_proto,
8507         .is_valid_access        = sk_msg_is_valid_access,
8508         .convert_ctx_access     = sk_msg_convert_ctx_access,
8509         .gen_prologue           = bpf_noop_prologue,
8510 };
8511
8512 const struct bpf_prog_ops sk_msg_prog_ops = {
8513 };
8514
8515 const struct bpf_verifier_ops flow_dissector_verifier_ops = {
8516         .get_func_proto         = flow_dissector_func_proto,
8517         .is_valid_access        = flow_dissector_is_valid_access,
8518         .convert_ctx_access     = flow_dissector_convert_ctx_access,
8519 };
8520
8521 const struct bpf_prog_ops flow_dissector_prog_ops = {
8522         .test_run               = bpf_prog_test_run_flow_dissector,
8523 };
8524
8525 int sk_detach_filter(struct sock *sk)
8526 {
8527         int ret = -ENOENT;
8528         struct sk_filter *filter;
8529
8530         if (sock_flag(sk, SOCK_FILTER_LOCKED))
8531                 return -EPERM;
8532
8533         filter = rcu_dereference_protected(sk->sk_filter,
8534                                            lockdep_sock_is_held(sk));
8535         if (filter) {
8536                 RCU_INIT_POINTER(sk->sk_filter, NULL);
8537                 sk_filter_uncharge(sk, filter);
8538                 ret = 0;
8539         }
8540
8541         return ret;
8542 }
8543 EXPORT_SYMBOL_GPL(sk_detach_filter);
8544
8545 int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf,
8546                   unsigned int len)
8547 {
8548         struct sock_fprog_kern *fprog;
8549         struct sk_filter *filter;
8550         int ret = 0;
8551
8552         lock_sock(sk);
8553         filter = rcu_dereference_protected(sk->sk_filter,
8554                                            lockdep_sock_is_held(sk));
8555         if (!filter)
8556                 goto out;
8557
8558         /* We're copying the filter that has been originally attached,
8559          * so no conversion/decode needed anymore. eBPF programs that
8560          * have no original program cannot be dumped through this.
8561          */
8562         ret = -EACCES;
8563         fprog = filter->prog->orig_prog;
8564         if (!fprog)
8565                 goto out;
8566
8567         ret = fprog->len;
8568         if (!len)
8569                 /* User space only enquires number of filter blocks. */
8570                 goto out;
8571
8572         ret = -EINVAL;
8573         if (len < fprog->len)
8574                 goto out;
8575
8576         ret = -EFAULT;
8577         if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog)))
8578                 goto out;
8579
8580         /* Instead of bytes, the API requests to return the number
8581          * of filter blocks.
8582          */
8583         ret = fprog->len;
8584 out:
8585         release_sock(sk);
8586         return ret;
8587 }
8588
8589 #ifdef CONFIG_INET
8590 static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern,
8591                                     struct sock_reuseport *reuse,
8592                                     struct sock *sk, struct sk_buff *skb,
8593                                     u32 hash)
8594 {
8595         reuse_kern->skb = skb;
8596         reuse_kern->sk = sk;
8597         reuse_kern->selected_sk = NULL;
8598         reuse_kern->data_end = skb->data + skb_headlen(skb);
8599         reuse_kern->hash = hash;
8600         reuse_kern->reuseport_id = reuse->reuseport_id;
8601         reuse_kern->bind_inany = reuse->bind_inany;
8602 }
8603
8604 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
8605                                   struct bpf_prog *prog, struct sk_buff *skb,
8606                                   u32 hash)
8607 {
8608         struct sk_reuseport_kern reuse_kern;
8609         enum sk_action action;
8610
8611         bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, hash);
8612         action = BPF_PROG_RUN(prog, &reuse_kern);
8613
8614         if (action == SK_PASS)
8615                 return reuse_kern.selected_sk;
8616         else
8617                 return ERR_PTR(-ECONNREFUSED);
8618 }
8619
8620 BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern,
8621            struct bpf_map *, map, void *, key, u32, flags)
8622 {
8623         struct sock_reuseport *reuse;
8624         struct sock *selected_sk;
8625
8626         selected_sk = map->ops->map_lookup_elem(map, key);
8627         if (!selected_sk)
8628                 return -ENOENT;
8629
8630         reuse = rcu_dereference(selected_sk->sk_reuseport_cb);
8631         if (!reuse)
8632                 /* selected_sk is unhashed (e.g. by close()) after the
8633                  * above map_lookup_elem().  Treat selected_sk has already
8634                  * been removed from the map.
8635                  */
8636                 return -ENOENT;
8637
8638         if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) {
8639                 struct sock *sk;
8640
8641                 if (unlikely(!reuse_kern->reuseport_id))
8642                         /* There is a small race between adding the
8643                          * sk to the map and setting the
8644                          * reuse_kern->reuseport_id.
8645                          * Treat it as the sk has not been added to
8646                          * the bpf map yet.
8647                          */
8648                         return -ENOENT;
8649
8650                 sk = reuse_kern->sk;
8651                 if (sk->sk_protocol != selected_sk->sk_protocol)
8652                         return -EPROTOTYPE;
8653                 else if (sk->sk_family != selected_sk->sk_family)
8654                         return -EAFNOSUPPORT;
8655
8656                 /* Catch all. Likely bound to a different sockaddr. */
8657                 return -EBADFD;
8658         }
8659
8660         reuse_kern->selected_sk = selected_sk;
8661
8662         return 0;
8663 }
8664
8665 static const struct bpf_func_proto sk_select_reuseport_proto = {
8666         .func           = sk_select_reuseport,
8667         .gpl_only       = false,
8668         .ret_type       = RET_INTEGER,
8669         .arg1_type      = ARG_PTR_TO_CTX,
8670         .arg2_type      = ARG_CONST_MAP_PTR,
8671         .arg3_type      = ARG_PTR_TO_MAP_KEY,
8672         .arg4_type      = ARG_ANYTHING,
8673 };
8674
8675 BPF_CALL_4(sk_reuseport_load_bytes,
8676            const struct sk_reuseport_kern *, reuse_kern, u32, offset,
8677            void *, to, u32, len)
8678 {
8679         return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len);
8680 }
8681
8682 static const struct bpf_func_proto sk_reuseport_load_bytes_proto = {
8683         .func           = sk_reuseport_load_bytes,
8684         .gpl_only       = false,
8685         .ret_type       = RET_INTEGER,
8686         .arg1_type      = ARG_PTR_TO_CTX,
8687         .arg2_type      = ARG_ANYTHING,
8688         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
8689         .arg4_type      = ARG_CONST_SIZE,
8690 };
8691
8692 BPF_CALL_5(sk_reuseport_load_bytes_relative,
8693            const struct sk_reuseport_kern *, reuse_kern, u32, offset,
8694            void *, to, u32, len, u32, start_header)
8695 {
8696         return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to,
8697                                                len, start_header);
8698 }
8699
8700 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = {
8701         .func           = sk_reuseport_load_bytes_relative,
8702         .gpl_only       = false,
8703         .ret_type       = RET_INTEGER,
8704         .arg1_type      = ARG_PTR_TO_CTX,
8705         .arg2_type      = ARG_ANYTHING,
8706         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
8707         .arg4_type      = ARG_CONST_SIZE,
8708         .arg5_type      = ARG_ANYTHING,
8709 };
8710
8711 static const struct bpf_func_proto *
8712 sk_reuseport_func_proto(enum bpf_func_id func_id,
8713                         const struct bpf_prog *prog)
8714 {
8715         switch (func_id) {
8716         case BPF_FUNC_sk_select_reuseport:
8717                 return &sk_select_reuseport_proto;
8718         case BPF_FUNC_skb_load_bytes:
8719                 return &sk_reuseport_load_bytes_proto;
8720         case BPF_FUNC_skb_load_bytes_relative:
8721                 return &sk_reuseport_load_bytes_relative_proto;
8722         default:
8723                 return bpf_base_func_proto(func_id);
8724         }
8725 }
8726
8727 static bool
8728 sk_reuseport_is_valid_access(int off, int size,
8729                              enum bpf_access_type type,
8730                              const struct bpf_prog *prog,
8731                              struct bpf_insn_access_aux *info)
8732 {
8733         const u32 size_default = sizeof(__u32);
8734
8735         if (off < 0 || off >= sizeof(struct sk_reuseport_md) ||
8736             off % size || type != BPF_READ)
8737                 return false;
8738
8739         switch (off) {
8740         case offsetof(struct sk_reuseport_md, data):
8741                 info->reg_type = PTR_TO_PACKET;
8742                 return size == sizeof(__u64);
8743
8744         case offsetof(struct sk_reuseport_md, data_end):
8745                 info->reg_type = PTR_TO_PACKET_END;
8746                 return size == sizeof(__u64);
8747
8748         case offsetof(struct sk_reuseport_md, hash):
8749                 return size == size_default;
8750
8751         /* Fields that allow narrowing */
8752         case bpf_ctx_range(struct sk_reuseport_md, eth_protocol):
8753                 if (size < sizeof_field(struct sk_buff, protocol))
8754                         return false;
8755                 /* fall through */
8756         case bpf_ctx_range(struct sk_reuseport_md, ip_protocol):
8757         case bpf_ctx_range(struct sk_reuseport_md, bind_inany):
8758         case bpf_ctx_range(struct sk_reuseport_md, len):
8759                 bpf_ctx_record_field_size(info, size_default);
8760                 return bpf_ctx_narrow_access_ok(off, size, size_default);
8761
8762         default:
8763                 return false;
8764         }
8765 }
8766
8767 #define SK_REUSEPORT_LOAD_FIELD(F) ({                                   \
8768         *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \
8769                               si->dst_reg, si->src_reg,                 \
8770                               bpf_target_off(struct sk_reuseport_kern, F, \
8771                                              sizeof_field(struct sk_reuseport_kern, F), \
8772                                              target_size));             \
8773         })
8774
8775 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD)                          \
8776         SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern,           \
8777                                     struct sk_buff,                     \
8778                                     skb,                                \
8779                                     SKB_FIELD)
8780
8781 #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD)                            \
8782         SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern,           \
8783                                     struct sock,                        \
8784                                     sk,                                 \
8785                                     SK_FIELD)
8786
8787 static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type,
8788                                            const struct bpf_insn *si,
8789                                            struct bpf_insn *insn_buf,
8790                                            struct bpf_prog *prog,
8791                                            u32 *target_size)
8792 {
8793         struct bpf_insn *insn = insn_buf;
8794
8795         switch (si->off) {
8796         case offsetof(struct sk_reuseport_md, data):
8797                 SK_REUSEPORT_LOAD_SKB_FIELD(data);
8798                 break;
8799
8800         case offsetof(struct sk_reuseport_md, len):
8801                 SK_REUSEPORT_LOAD_SKB_FIELD(len);
8802                 break;
8803
8804         case offsetof(struct sk_reuseport_md, eth_protocol):
8805                 SK_REUSEPORT_LOAD_SKB_FIELD(protocol);
8806                 break;
8807
8808         case offsetof(struct sk_reuseport_md, ip_protocol):
8809                 SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol);
8810                 break;
8811
8812         case offsetof(struct sk_reuseport_md, data_end):
8813                 SK_REUSEPORT_LOAD_FIELD(data_end);
8814                 break;
8815
8816         case offsetof(struct sk_reuseport_md, hash):
8817                 SK_REUSEPORT_LOAD_FIELD(hash);
8818                 break;
8819
8820         case offsetof(struct sk_reuseport_md, bind_inany):
8821                 SK_REUSEPORT_LOAD_FIELD(bind_inany);
8822                 break;
8823         }
8824
8825         return insn - insn_buf;
8826 }
8827
8828 const struct bpf_verifier_ops sk_reuseport_verifier_ops = {
8829         .get_func_proto         = sk_reuseport_func_proto,
8830         .is_valid_access        = sk_reuseport_is_valid_access,
8831         .convert_ctx_access     = sk_reuseport_convert_ctx_access,
8832 };
8833
8834 const struct bpf_prog_ops sk_reuseport_prog_ops = {
8835 };
8836 #endif /* CONFIG_INET */
8837
8838 DEFINE_BPF_DISPATCHER(bpf_dispatcher_xdp)
8839
8840 void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog)
8841 {
8842         bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(bpf_dispatcher_xdp),
8843                                    prev_prog, prog);
8844 }