net/ipv4/ip_tunnel_core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2013 Nicira, Inc.
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/skbuff.h>
  11 #include <linux/netdevice.h>
  12 #include <linux/in.h>
  13 #include <linux/if_arp.h>
  14 #include <linux/init.h>
  15 #include <linux/in6.h>
  16 #include <linux/inetdevice.h>
  17 #include <linux/netfilter_ipv4.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/if_ether.h>
  20 #include <linux/if_vlan.h>
  21 #include <linux/static_key.h>
  22
  23 #include <net/ip.h>
  24 #include <net/icmp.h>
  25 #include <net/protocol.h>
  26 #include <net/ip_tunnels.h>
  27 #include <net/ip6_tunnel.h>
  28 #include <net/arp.h>
  29 #include <net/checksum.h>
  30 #include <net/dsfield.h>
  31 #include <net/inet_ecn.h>
  32 #include <net/xfrm.h>
  33 #include <net/net_namespace.h>
  34 #include <net/netns/generic.h>
  35 #include <net/rtnetlink.h>
  36 #include <net/dst_metadata.h>
  37 #include <net/geneve.h>
  38 #include <net/vxlan.h>
  39
  40 const struct ip_tunnel_encap_ops __rcu *
  41                 iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
  42 EXPORT_SYMBOL(iptun_encaps);
  43
  44 const struct ip6_tnl_encap_ops __rcu *
  45                 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
  46 EXPORT_SYMBOL(ip6tun_encaps);
  47
  48 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
  49                    __be32 src, __be32 dst, __u8 proto,
  50                    __u8 tos, __u8 ttl, __be16 df, bool xnet)
  51 {
  52         int pkt_len = skb->len - skb_inner_network_offset(skb);
  53         struct net *net = dev_net(rt->dst.dev);
  54         struct net_device *dev = skb->dev;
  55         struct iphdr *iph;
  56         int err;
  57
  58         skb_scrub_packet(skb, xnet);
  59
  60         skb_clear_hash_if_not_l4(skb);
  61         skb_dst_set(skb, &rt->dst);
  62         memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
  63
  64         /* Push down and install the IP header. */
  65         skb_push(skb, sizeof(struct iphdr));
  66         skb_reset_network_header(skb);
  67
  68         iph = ip_hdr(skb);
  69
  70         iph->version    =       4;
  71         iph->ihl        =       sizeof(struct iphdr) >> 2;
  72         iph->frag_off   =       ip_mtu_locked(&rt->dst) ? 0 : df;
  73         iph->protocol   =       proto;
  74         iph->tos        =       tos;
  75         iph->daddr      =       dst;
  76         iph->saddr      =       src;
  77         iph->ttl        =       ttl;
  78         __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
  79
  80         err = ip_local_out(net, sk, skb);
  81
  82         if (dev) {
  83                 if (unlikely(net_xmit_eval(err)))
  84                         pkt_len = 0;
  85                 iptunnel_xmit_stats(dev, pkt_len);
  86         }
  87 }
  88 EXPORT_SYMBOL_GPL(iptunnel_xmit);
  89
  90 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
  91                            __be16 inner_proto, bool raw_proto, bool xnet)
  92 {
  93         if (unlikely(!pskb_may_pull(skb, hdr_len)))
  94                 return -ENOMEM;
  95
  96         skb_pull_rcsum(skb, hdr_len);
  97
  98         if (!raw_proto && inner_proto == htons(ETH_P_TEB)) {
  99                 struct ethhdr *eh;
 100
 101                 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 102                         return -ENOMEM;
 103
 104                 eh = (struct ethhdr *)skb->data;
 105                 if (likely(eth_proto_is_802_3(eh->h_proto)))
 106                         skb->protocol = eh->h_proto;
 107                 else
 108                         skb->protocol = htons(ETH_P_802_2);
 109
 110         } else {
 111                 skb->protocol = inner_proto;
 112         }
 113
 114         skb_clear_hash_if_not_l4(skb);
 115         __vlan_hwaccel_clear_tag(skb);
 116         skb_set_queue_mapping(skb, 0);
 117         skb_scrub_packet(skb, xnet);
 118
 119         return iptunnel_pull_offloads(skb);
 120 }
 121 EXPORT_SYMBOL_GPL(__iptunnel_pull_header);
 122
 123 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
 124                                              gfp_t flags)
 125 {
 126         struct metadata_dst *res;
 127         struct ip_tunnel_info *dst, *src;
 128
 129         if (!md || md->type != METADATA_IP_TUNNEL ||
 130             md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
 131                 return NULL;
 132
 133         src = &md->u.tun_info;
 134         res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags);
 135         if (!res)
 136                 return NULL;
 137
 138         dst = &res->u.tun_info;
 139         dst->key.tun_id = src->key.tun_id;
 140         if (src->mode & IP_TUNNEL_INFO_IPV6)
 141                 memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
 142                        sizeof(struct in6_addr));
 143         else
 144                 dst->key.u.ipv4.dst = src->key.u.ipv4.src;
 145         dst->key.tun_flags = src->key.tun_flags;
 146         dst->mode = src->mode | IP_TUNNEL_INFO_TX;
 147         ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src),
 148                                 src->options_len, 0);
 149
 150         return res;
 151 }
 152 EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
 153
 154 int iptunnel_handle_offloads(struct sk_buff *skb,
 155                              int gso_type_mask)
 156 {
 157         int err;
 158
 159         if (likely(!skb->encapsulation)) {
 160                 skb_reset_inner_headers(skb);
 161                 skb->encapsulation = 1;
 162         }
 163
 164         if (skb_is_gso(skb)) {
 165                 err = skb_header_unclone(skb, GFP_ATOMIC);
 166                 if (unlikely(err))
 167                         return err;
 168                 skb_shinfo(skb)->gso_type |= gso_type_mask;
 169                 return 0;
 170         }
 171
 172         if (skb->ip_summed != CHECKSUM_PARTIAL) {
 173                 skb->ip_summed = CHECKSUM_NONE;
 174                 /* We clear encapsulation here to prevent badly-written
 175                  * drivers potentially deciding to offload an inner checksum
 176                  * if we set CHECKSUM_PARTIAL on the outer header.
 177                  * This should go away when the drivers are all fixed.
 178                  */
 179                 skb->encapsulation = 0;
 180         }
 181
 182         return 0;
 183 }
 184 EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
 185
 186 /* Often modified stats are per cpu, other are shared (netdev->stats) */
 187 void ip_tunnel_get_stats64(struct net_device *dev,
 188                            struct rtnl_link_stats64 *tot)
 189 {
 190         int i;
 191
 192         netdev_stats_to_stats64(tot, &dev->stats);
 193
 194         for_each_possible_cpu(i) {
 195                 const struct pcpu_sw_netstats *tstats =
 196                                                    per_cpu_ptr(dev->tstats, i);
 197                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
 198                 unsigned int start;
 199
 200                 do {
 201                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
 202                         rx_packets = tstats->rx_packets;
 203                         tx_packets = tstats->tx_packets;
 204                         rx_bytes = tstats->rx_bytes;
 205                         tx_bytes = tstats->tx_bytes;
 206                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
 207
 208                 tot->rx_packets += rx_packets;
 209                 tot->tx_packets += tx_packets;
 210                 tot->rx_bytes   += rx_bytes;
 211                 tot->tx_bytes   += tx_bytes;
 212         }
 213 }
 214 EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
 215
 216 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
 217         [LWTUNNEL_IP_ID]        = { .type = NLA_U64 },
 218         [LWTUNNEL_IP_DST]       = { .type = NLA_U32 },
 219         [LWTUNNEL_IP_SRC]       = { .type = NLA_U32 },
 220         [LWTUNNEL_IP_TTL]       = { .type = NLA_U8 },
 221         [LWTUNNEL_IP_TOS]       = { .type = NLA_U8 },
 222         [LWTUNNEL_IP_FLAGS]     = { .type = NLA_U16 },
 223         [LWTUNNEL_IP_OPTS]      = { .type = NLA_NESTED },
 224 };
 225
 226 static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = {
 227         [LWTUNNEL_IP_OPTS_GENEVE]       = { .type = NLA_NESTED },
 228         [LWTUNNEL_IP_OPTS_VXLAN]        = { .type = NLA_NESTED },
 229 };
 230
 231 static const struct nla_policy
 232 geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = {
 233         [LWTUNNEL_IP_OPT_GENEVE_CLASS]  = { .type = NLA_U16 },
 234         [LWTUNNEL_IP_OPT_GENEVE_TYPE]   = { .type = NLA_U8 },
 235         [LWTUNNEL_IP_OPT_GENEVE_DATA]   = { .type = NLA_BINARY, .len = 128 },
 236 };
 237
 238 static const struct nla_policy
 239 vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = {
 240         [LWTUNNEL_IP_OPT_VXLAN_GBP]     = { .type = NLA_U32 },
 241 };
 242
 243 static int ip_tun_parse_opts_geneve(struct nlattr *attr,
 244                                     struct ip_tunnel_info *info,
 245                                     struct netlink_ext_ack *extack)
 246 {
 247         struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1];
 248         int data_len, err;
 249
 250         err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_OPT_GENEVE_MAX,
 251                                           attr, geneve_opt_policy, extack);
 252         if (err)
 253                 return err;
 254
 255         if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] ||
 256             !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] ||
 257             !tb[LWTUNNEL_IP_OPT_GENEVE_DATA])
 258                 return -EINVAL;
 259
 260         attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];
 261         data_len = nla_len(attr);
 262         if (data_len % 4)
 263                 return -EINVAL;
 264
 265         if (info) {
 266                 struct geneve_opt *opt = ip_tunnel_info_opts(info);
 267
 268                 memcpy(opt->opt_data, nla_data(attr), data_len);
 269                 opt->length = data_len / 4;
 270                 attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS];
 271                 opt->opt_class = nla_get_be16(attr);
 272                 attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE];
 273                 opt->type = nla_get_u8(attr);
 274                 info->key.tun_flags |= TUNNEL_GENEVE_OPT;
 275         }
 276
 277         return sizeof(struct geneve_opt) + data_len;
 278 }
 279
 280 static int ip_tun_parse_opts_vxlan(struct nlattr *attr,
 281                                    struct ip_tunnel_info *info,
 282                                    struct netlink_ext_ack *extack)
 283 {
 284         struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1];
 285         int err;
 286
 287         err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_OPT_VXLAN_MAX,
 288                                           attr, vxlan_opt_policy, extack);
 289         if (err)
 290                 return err;
 291
 292         if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP])
 293                 return -EINVAL;
 294
 295         if (info) {
 296                 struct vxlan_metadata *md = ip_tunnel_info_opts(info);
 297
 298                 attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP];
 299                 md->gbp = nla_get_u32(attr);
 300                 info->key.tun_flags |= TUNNEL_VXLAN_OPT;
 301         }
 302
 303         return sizeof(struct vxlan_metadata);
 304 }
 305
 306 static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info,
 307                              struct netlink_ext_ack *extack)
 308 {
 309         struct nlattr *tb[LWTUNNEL_IP_OPTS_MAX + 1];
 310         int err;
 311
 312         if (!attr)
 313                 return 0;
 314
 315         err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_OPTS_MAX, attr,
 316                                           ip_opts_policy, extack);
 317         if (err)
 318                 return err;
 319
 320         if (tb[LWTUNNEL_IP_OPTS_GENEVE])
 321                 err = ip_tun_parse_opts_geneve(tb[LWTUNNEL_IP_OPTS_GENEVE],
 322                                                info, extack);
 323         else if (tb[LWTUNNEL_IP_OPTS_VXLAN])
 324                 err = ip_tun_parse_opts_vxlan(tb[LWTUNNEL_IP_OPTS_VXLAN],
 325                                               info, extack);
 326         else
 327                 err = -EINVAL;
 328
 329         return err;
 330 }
 331
 332 static int ip_tun_get_optlen(struct nlattr *attr,
 333                              struct netlink_ext_ack *extack)
 334 {
 335         return ip_tun_parse_opts(attr, NULL, extack);
 336 }
 337
 338 static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info,
 339                            struct netlink_ext_ack *extack)
 340 {
 341         return ip_tun_parse_opts(attr, info, extack);
 342 }
 343
 344 static int ip_tun_build_state(struct nlattr *attr,
 345                               unsigned int family, const void *cfg,
 346                               struct lwtunnel_state **ts,
 347                               struct netlink_ext_ack *extack)
 348 {
 349         struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
 350         struct lwtunnel_state *new_state;
 351         struct ip_tunnel_info *tun_info;
 352         int err, opt_len;
 353
 354         err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr,
 355                                           ip_tun_policy, extack);
 356         if (err < 0)
 357                 return err;
 358
 359         opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack);
 360         if (opt_len < 0)
 361                 return opt_len;
 362
 363         new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
 364         if (!new_state)
 365                 return -ENOMEM;
 366
 367         new_state->type = LWTUNNEL_ENCAP_IP;
 368
 369         tun_info = lwt_tun_info(new_state);
 370
 371         err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack);
 372         if (err < 0) {
 373                 lwtstate_free(new_state);
 374                 return err;
 375         }
 376
 377 #ifdef CONFIG_DST_CACHE
 378         err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL);
 379         if (err) {
 380                 lwtstate_free(new_state);
 381                 return err;
 382         }
 383 #endif
 384
 385         if (tb[LWTUNNEL_IP_ID])
 386                 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
 387
 388         if (tb[LWTUNNEL_IP_DST])
 389                 tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]);
 390
 391         if (tb[LWTUNNEL_IP_SRC])
 392                 tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]);
 393
 394         if (tb[LWTUNNEL_IP_TTL])
 395                 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
 396
 397         if (tb[LWTUNNEL_IP_TOS])
 398                 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
 399
 400         if (tb[LWTUNNEL_IP_FLAGS])
 401                 tun_info->key.tun_flags |= nla_get_be16(tb[LWTUNNEL_IP_FLAGS]);
 402
 403         tun_info->mode = IP_TUNNEL_INFO_TX;
 404         tun_info->options_len = opt_len;
 405
 406         *ts = new_state;
 407
 408         return 0;
 409 }
 410
 411 static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate)
 412 {
 413 #ifdef CONFIG_DST_CACHE
 414         struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
 415
 416         dst_cache_destroy(&tun_info->dst_cache);
 417 #endif
 418 }
 419
 420 static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb,
 421                                          struct ip_tunnel_info *tun_info)
 422 {
 423         struct geneve_opt *opt;
 424         struct nlattr *nest;
 425
 426         nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE);
 427         if (!nest)
 428                 return -ENOMEM;
 429
 430         opt = ip_tunnel_info_opts(tun_info);
 431         if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS, opt->opt_class) ||
 432             nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) ||
 433             nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4,
 434                     opt->opt_data)) {
 435                 nla_nest_cancel(skb, nest);
 436                 return -ENOMEM;
 437         }
 438
 439         nla_nest_end(skb, nest);
 440         return 0;
 441 }
 442
 443 static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb,
 444                                         struct ip_tunnel_info *tun_info)
 445 {
 446         struct vxlan_metadata *md;
 447         struct nlattr *nest;
 448
 449         nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN);
 450         if (!nest)
 451                 return -ENOMEM;
 452
 453         md = ip_tunnel_info_opts(tun_info);
 454         if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) {
 455                 nla_nest_cancel(skb, nest);
 456                 return -ENOMEM;
 457         }
 458
 459         nla_nest_end(skb, nest);
 460         return 0;
 461 }
 462
 463 static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type,
 464                                   struct ip_tunnel_info *tun_info)
 465 {
 466         struct nlattr *nest;
 467         int err = 0;
 468
 469         if (!(tun_info->key.tun_flags &
 470               (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT)))
 471                 return 0;
 472
 473         nest = nla_nest_start_noflag(skb, type);
 474         if (!nest)
 475                 return -ENOMEM;
 476
 477         if (tun_info->key.tun_flags & TUNNEL_GENEVE_OPT)
 478                 err = ip_tun_fill_encap_opts_geneve(skb, tun_info);
 479         else if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT)
 480                 err = ip_tun_fill_encap_opts_vxlan(skb, tun_info);
 481
 482         if (err) {
 483                 nla_nest_cancel(skb, nest);
 484                 return err;
 485         }
 486
 487         nla_nest_end(skb, nest);
 488         return 0;
 489 }
 490
 491 static int ip_tun_fill_encap_info(struct sk_buff *skb,
 492                                   struct lwtunnel_state *lwtstate)
 493 {
 494         struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
 495
 496         if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id,
 497                          LWTUNNEL_IP_PAD) ||
 498             nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
 499             nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
 500             nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
 501             nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
 502             nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags) ||
 503             ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info))
 504                 return -ENOMEM;
 505
 506         return 0;
 507 }
 508
 509 static int ip_tun_opts_nlsize(struct ip_tunnel_info *info)
 510 {
 511         int opt_len;
 512
 513         if (!(info->key.tun_flags &
 514               (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT)))
 515                 return 0;
 516
 517         opt_len = nla_total_size(0);            /* LWTUNNEL_IP_OPTS */
 518         if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
 519                 struct geneve_opt *opt = ip_tunnel_info_opts(info);
 520
 521                 opt_len += nla_total_size(0)    /* LWTUNNEL_IP_OPTS_GENEVE */
 522                            + nla_total_size(2)  /* OPT_GENEVE_CLASS */
 523                            + nla_total_size(1)  /* OPT_GENEVE_TYPE */
 524                            + nla_total_size(opt->length * 4);
 525                                                 /* OPT_GENEVE_DATA */
 526         } else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
 527                 opt_len += nla_total_size(0)    /* LWTUNNEL_IP_OPTS_VXLAN */
 528                            + nla_total_size(4); /* OPT_VXLAN_GBP */
 529         }
 530
 531         return opt_len;
 532 }
 533
 534 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
 535 {
 536         return nla_total_size_64bit(8)  /* LWTUNNEL_IP_ID */
 537                 + nla_total_size(4)     /* LWTUNNEL_IP_DST */
 538                 + nla_total_size(4)     /* LWTUNNEL_IP_SRC */
 539                 + nla_total_size(1)     /* LWTUNNEL_IP_TOS */
 540                 + nla_total_size(1)     /* LWTUNNEL_IP_TTL */
 541                 + nla_total_size(2)     /* LWTUNNEL_IP_FLAGS */
 542                 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
 543                                         /* LWTUNNEL_IP_OPTS */
 544 }
 545
 546 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
 547 {
 548         struct ip_tunnel_info *info_a = lwt_tun_info(a);
 549         struct ip_tunnel_info *info_b = lwt_tun_info(b);
 550
 551         return memcmp(info_a, info_b, sizeof(info_a->key)) ||
 552                info_a->mode != info_b->mode ||
 553                info_a->options_len != info_b->options_len ||
 554                memcmp(ip_tunnel_info_opts(info_a),
 555                       ip_tunnel_info_opts(info_b), info_a->options_len);
 556 }
 557
 558 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
 559         .build_state = ip_tun_build_state,
 560         .destroy_state = ip_tun_destroy_state,
 561         .fill_encap = ip_tun_fill_encap_info,
 562         .get_encap_size = ip_tun_encap_nlsize,
 563         .cmp_encap = ip_tun_cmp_encap,
 564         .owner = THIS_MODULE,
 565 };
 566
 567 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
 568         [LWTUNNEL_IP6_ID]               = { .type = NLA_U64 },
 569         [LWTUNNEL_IP6_DST]              = { .len = sizeof(struct in6_addr) },
 570         [LWTUNNEL_IP6_SRC]              = { .len = sizeof(struct in6_addr) },
 571         [LWTUNNEL_IP6_HOPLIMIT]         = { .type = NLA_U8 },
 572         [LWTUNNEL_IP6_TC]               = { .type = NLA_U8 },
 573         [LWTUNNEL_IP6_FLAGS]            = { .type = NLA_U16 },
 574 };
 575
 576 static int ip6_tun_build_state(struct nlattr *attr,
 577                                unsigned int family, const void *cfg,
 578                                struct lwtunnel_state **ts,
 579                                struct netlink_ext_ack *extack)
 580 {
 581         struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
 582         struct lwtunnel_state *new_state;
 583         struct ip_tunnel_info *tun_info;
 584         int err, opt_len;
 585
 586         err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr,
 587                                           ip6_tun_policy, extack);
 588         if (err < 0)
 589                 return err;
 590
 591         opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack);
 592         if (opt_len < 0)
 593                 return opt_len;
 594
 595         new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
 596         if (!new_state)
 597                 return -ENOMEM;
 598
 599         new_state->type = LWTUNNEL_ENCAP_IP6;
 600
 601         tun_info = lwt_tun_info(new_state);
 602
 603         err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack);
 604         if (err < 0) {
 605                 lwtstate_free(new_state);
 606                 return err;
 607         }
 608
 609         if (tb[LWTUNNEL_IP6_ID])
 610                 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
 611
 612         if (tb[LWTUNNEL_IP6_DST])
 613                 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
 614
 615         if (tb[LWTUNNEL_IP6_SRC])
 616                 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
 617
 618         if (tb[LWTUNNEL_IP6_HOPLIMIT])
 619                 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
 620
 621         if (tb[LWTUNNEL_IP6_TC])
 622                 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
 623
 624         if (tb[LWTUNNEL_IP6_FLAGS])
 625                 tun_info->key.tun_flags |= nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]);
 626
 627         tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
 628         tun_info->options_len = opt_len;
 629
 630         *ts = new_state;
 631
 632         return 0;
 633 }
 634
 635 static int ip6_tun_fill_encap_info(struct sk_buff *skb,
 636                                    struct lwtunnel_state *lwtstate)
 637 {
 638         struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
 639
 640         if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id,
 641                          LWTUNNEL_IP6_PAD) ||
 642             nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
 643             nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
 644             nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
 645             nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
 646             nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags) ||
 647             ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info))
 648                 return -ENOMEM;
 649
 650         return 0;
 651 }
 652
 653 static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
 654 {
 655         return nla_total_size_64bit(8)  /* LWTUNNEL_IP6_ID */
 656                 + nla_total_size(16)    /* LWTUNNEL_IP6_DST */
 657                 + nla_total_size(16)    /* LWTUNNEL_IP6_SRC */
 658                 + nla_total_size(1)     /* LWTUNNEL_IP6_HOPLIMIT */
 659                 + nla_total_size(1)     /* LWTUNNEL_IP6_TC */
 660                 + nla_total_size(2)     /* LWTUNNEL_IP6_FLAGS */
 661                 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
 662                                         /* LWTUNNEL_IP6_OPTS */
 663 }
 664
 665 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
 666         .build_state = ip6_tun_build_state,
 667         .fill_encap = ip6_tun_fill_encap_info,
 668         .get_encap_size = ip6_tun_encap_nlsize,
 669         .cmp_encap = ip_tun_cmp_encap,
 670         .owner = THIS_MODULE,
 671 };
 672
 673 void __init ip_tunnel_core_init(void)
 674 {
 675         /* If you land here, make sure whether increasing ip_tunnel_info's
 676          * options_len is a reasonable choice with its usage in front ends
 677          * (f.e., it's part of flow keys, etc).
 678          */
 679         BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
 680
 681         lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
 682         lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
 683 }
 684
 685 DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
 686 EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
 687
 688 void ip_tunnel_need_metadata(void)
 689 {
 690         static_branch_inc(&ip_tunnel_metadata_cnt);
 691 }
 692 EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
 693
 694 void ip_tunnel_unneed_metadata(void)
 695 {
 696         static_branch_dec(&ip_tunnel_metadata_cnt);
 697 }
 698 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);