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 #include <net/erspan.h>
  40
  41 const struct ip_tunnel_encap_ops __rcu *
  42                 iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
  43 EXPORT_SYMBOL(iptun_encaps);
  44
  45 const struct ip6_tnl_encap_ops __rcu *
  46                 ip6tun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
  47 EXPORT_SYMBOL(ip6tun_encaps);
  48
  49 void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
  50                    __be32 src, __be32 dst, __u8 proto,
  51                    __u8 tos, __u8 ttl, __be16 df, bool xnet)
  52 {
  53         int pkt_len = skb->len - skb_inner_network_offset(skb);
  54         struct net *net = dev_net(rt->dst.dev);
  55         struct net_device *dev = skb->dev;
  56         struct iphdr *iph;
  57         int err;
  58
  59         skb_scrub_packet(skb, xnet);
  60
  61         skb_clear_hash_if_not_l4(skb);
  62         skb_dst_set(skb, &rt->dst);
  63         memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
  64
  65         /* Push down and install the IP header. */
  66         skb_push(skb, sizeof(struct iphdr));
  67         skb_reset_network_header(skb);
  68
  69         iph = ip_hdr(skb);
  70
  71         iph->version    =       4;
  72         iph->ihl        =       sizeof(struct iphdr) >> 2;
  73         iph->frag_off   =       ip_mtu_locked(&rt->dst) ? 0 : df;
  74         iph->protocol   =       proto;
  75         iph->tos        =       tos;
  76         iph->daddr      =       dst;
  77         iph->saddr      =       src;
  78         iph->ttl        =       ttl;
  79         __ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
  80
  81         err = ip_local_out(net, sk, skb);
  82
  83         if (dev) {
  84                 if (unlikely(net_xmit_eval(err)))
  85                         pkt_len = 0;
  86                 iptunnel_xmit_stats(dev, pkt_len);
  87         }
  88 }
  89 EXPORT_SYMBOL_GPL(iptunnel_xmit);
  90
  91 int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
  92                            __be16 inner_proto, bool raw_proto, bool xnet)
  93 {
  94         if (unlikely(!pskb_may_pull(skb, hdr_len)))
  95                 return -ENOMEM;
  96
  97         skb_pull_rcsum(skb, hdr_len);
  98
  99         if (!raw_proto && inner_proto == htons(ETH_P_TEB)) {
 100                 struct ethhdr *eh;
 101
 102                 if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 103                         return -ENOMEM;
 104
 105                 eh = (struct ethhdr *)skb->data;
 106                 if (likely(eth_proto_is_802_3(eh->h_proto)))
 107                         skb->protocol = eh->h_proto;
 108                 else
 109                         skb->protocol = htons(ETH_P_802_2);
 110
 111         } else {
 112                 skb->protocol = inner_proto;
 113         }
 114
 115         skb_clear_hash_if_not_l4(skb);
 116         __vlan_hwaccel_clear_tag(skb);
 117         skb_set_queue_mapping(skb, 0);
 118         skb_scrub_packet(skb, xnet);
 119
 120         return iptunnel_pull_offloads(skb);
 121 }
 122 EXPORT_SYMBOL_GPL(__iptunnel_pull_header);
 123
 124 struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
 125                                              gfp_t flags)
 126 {
 127         struct metadata_dst *res;
 128         struct ip_tunnel_info *dst, *src;
 129
 130         if (!md || md->type != METADATA_IP_TUNNEL ||
 131             md->u.tun_info.mode & IP_TUNNEL_INFO_TX)
 132                 return NULL;
 133
 134         src = &md->u.tun_info;
 135         res = metadata_dst_alloc(src->options_len, METADATA_IP_TUNNEL, flags);
 136         if (!res)
 137                 return NULL;
 138
 139         dst = &res->u.tun_info;
 140         dst->key.tun_id = src->key.tun_id;
 141         if (src->mode & IP_TUNNEL_INFO_IPV6)
 142                 memcpy(&dst->key.u.ipv6.dst, &src->key.u.ipv6.src,
 143                        sizeof(struct in6_addr));
 144         else
 145                 dst->key.u.ipv4.dst = src->key.u.ipv4.src;
 146         dst->key.tun_flags = src->key.tun_flags;
 147         dst->mode = src->mode | IP_TUNNEL_INFO_TX;
 148         ip_tunnel_info_opts_set(dst, ip_tunnel_info_opts(src),
 149                                 src->options_len, 0);
 150
 151         return res;
 152 }
 153 EXPORT_SYMBOL_GPL(iptunnel_metadata_reply);
 154
 155 int iptunnel_handle_offloads(struct sk_buff *skb,
 156                              int gso_type_mask)
 157 {
 158         int err;
 159
 160         if (likely(!skb->encapsulation)) {
 161                 skb_reset_inner_headers(skb);
 162                 skb->encapsulation = 1;
 163         }
 164
 165         if (skb_is_gso(skb)) {
 166                 err = skb_header_unclone(skb, GFP_ATOMIC);
 167                 if (unlikely(err))
 168                         return err;
 169                 skb_shinfo(skb)->gso_type |= gso_type_mask;
 170                 return 0;
 171         }
 172
 173         if (skb->ip_summed != CHECKSUM_PARTIAL) {
 174                 skb->ip_summed = CHECKSUM_NONE;
 175                 /* We clear encapsulation here to prevent badly-written
 176                  * drivers potentially deciding to offload an inner checksum
 177                  * if we set CHECKSUM_PARTIAL on the outer header.
 178                  * This should go away when the drivers are all fixed.
 179                  */
 180                 skb->encapsulation = 0;
 181         }
 182
 183         return 0;
 184 }
 185 EXPORT_SYMBOL_GPL(iptunnel_handle_offloads);
 186
 187 /* Often modified stats are per cpu, other are shared (netdev->stats) */
 188 void ip_tunnel_get_stats64(struct net_device *dev,
 189                            struct rtnl_link_stats64 *tot)
 190 {
 191         int i;
 192
 193         netdev_stats_to_stats64(tot, &dev->stats);
 194
 195         for_each_possible_cpu(i) {
 196                 const struct pcpu_sw_netstats *tstats =
 197                                                    per_cpu_ptr(dev->tstats, i);
 198                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
 199                 unsigned int start;
 200
 201                 do {
 202                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
 203                         rx_packets = tstats->rx_packets;
 204                         tx_packets = tstats->tx_packets;
 205                         rx_bytes = tstats->rx_bytes;
 206                         tx_bytes = tstats->tx_bytes;
 207                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
 208
 209                 tot->rx_packets += rx_packets;
 210                 tot->tx_packets += tx_packets;
 211                 tot->rx_bytes   += rx_bytes;
 212                 tot->tx_bytes   += tx_bytes;
 213         }
 214 }
 215 EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
 216
 217 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
 218         [LWTUNNEL_IP_ID]        = { .type = NLA_U64 },
 219         [LWTUNNEL_IP_DST]       = { .type = NLA_U32 },
 220         [LWTUNNEL_IP_SRC]       = { .type = NLA_U32 },
 221         [LWTUNNEL_IP_TTL]       = { .type = NLA_U8 },
 222         [LWTUNNEL_IP_TOS]       = { .type = NLA_U8 },
 223         [LWTUNNEL_IP_FLAGS]     = { .type = NLA_U16 },
 224         [LWTUNNEL_IP_OPTS]      = { .type = NLA_NESTED },
 225 };
 226
 227 static const struct nla_policy ip_opts_policy[LWTUNNEL_IP_OPTS_MAX + 1] = {
 228         [LWTUNNEL_IP_OPTS_GENEVE]       = { .type = NLA_NESTED },
 229         [LWTUNNEL_IP_OPTS_VXLAN]        = { .type = NLA_NESTED },
 230         [LWTUNNEL_IP_OPTS_ERSPAN]       = { .type = NLA_NESTED },
 231 };
 232
 233 static const struct nla_policy
 234 geneve_opt_policy[LWTUNNEL_IP_OPT_GENEVE_MAX + 1] = {
 235         [LWTUNNEL_IP_OPT_GENEVE_CLASS]  = { .type = NLA_U16 },
 236         [LWTUNNEL_IP_OPT_GENEVE_TYPE]   = { .type = NLA_U8 },
 237         [LWTUNNEL_IP_OPT_GENEVE_DATA]   = { .type = NLA_BINARY, .len = 128 },
 238 };
 239
 240 static const struct nla_policy
 241 vxlan_opt_policy[LWTUNNEL_IP_OPT_VXLAN_MAX + 1] = {
 242         [LWTUNNEL_IP_OPT_VXLAN_GBP]     = { .type = NLA_U32 },
 243 };
 244
 245 static const struct nla_policy
 246 erspan_opt_policy[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1] = {
 247         [LWTUNNEL_IP_OPT_ERSPAN_VER]    = { .type = NLA_U8 },
 248         [LWTUNNEL_IP_OPT_ERSPAN_INDEX]  = { .type = NLA_U32 },
 249         [LWTUNNEL_IP_OPT_ERSPAN_DIR]    = { .type = NLA_U8 },
 250         [LWTUNNEL_IP_OPT_ERSPAN_HWID]   = { .type = NLA_U8 },
 251 };
 252
 253 static int ip_tun_parse_opts_geneve(struct nlattr *attr,
 254                                     struct ip_tunnel_info *info,
 255                                     struct netlink_ext_ack *extack)
 256 {
 257         struct nlattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1];
 258         int data_len, err;
 259
 260         err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, attr,
 261                                geneve_opt_policy, extack);
 262         if (err)
 263                 return err;
 264
 265         if (!tb[LWTUNNEL_IP_OPT_GENEVE_CLASS] ||
 266             !tb[LWTUNNEL_IP_OPT_GENEVE_TYPE] ||
 267             !tb[LWTUNNEL_IP_OPT_GENEVE_DATA])
 268                 return -EINVAL;
 269
 270         attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];
 271         data_len = nla_len(attr);
 272         if (data_len % 4)
 273                 return -EINVAL;
 274
 275         if (info) {
 276                 struct geneve_opt *opt = ip_tunnel_info_opts(info);
 277
 278                 memcpy(opt->opt_data, nla_data(attr), data_len);
 279                 opt->length = data_len / 4;
 280                 attr = tb[LWTUNNEL_IP_OPT_GENEVE_CLASS];
 281                 opt->opt_class = nla_get_be16(attr);
 282                 attr = tb[LWTUNNEL_IP_OPT_GENEVE_TYPE];
 283                 opt->type = nla_get_u8(attr);
 284                 info->key.tun_flags |= TUNNEL_GENEVE_OPT;
 285         }
 286
 287         return sizeof(struct geneve_opt) + data_len;
 288 }
 289
 290 static int ip_tun_parse_opts_vxlan(struct nlattr *attr,
 291                                    struct ip_tunnel_info *info,
 292                                    struct netlink_ext_ack *extack)
 293 {
 294         struct nlattr *tb[LWTUNNEL_IP_OPT_VXLAN_MAX + 1];
 295         int err;
 296
 297         err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_VXLAN_MAX, attr,
 298                                vxlan_opt_policy, extack);
 299         if (err)
 300                 return err;
 301
 302         if (!tb[LWTUNNEL_IP_OPT_VXLAN_GBP])
 303                 return -EINVAL;
 304
 305         if (info) {
 306                 struct vxlan_metadata *md = ip_tunnel_info_opts(info);
 307
 308                 attr = tb[LWTUNNEL_IP_OPT_VXLAN_GBP];
 309                 md->gbp = nla_get_u32(attr);
 310                 info->key.tun_flags |= TUNNEL_VXLAN_OPT;
 311         }
 312
 313         return sizeof(struct vxlan_metadata);
 314 }
 315
 316 static int ip_tun_parse_opts_erspan(struct nlattr *attr,
 317                                     struct ip_tunnel_info *info,
 318                                     struct netlink_ext_ack *extack)
 319 {
 320         struct nlattr *tb[LWTUNNEL_IP_OPT_ERSPAN_MAX + 1];
 321         int err;
 322
 323         err = nla_parse_nested(tb, LWTUNNEL_IP_OPT_ERSPAN_MAX, attr,
 324                                erspan_opt_policy, extack);
 325         if (err)
 326                 return err;
 327
 328         if (!tb[LWTUNNEL_IP_OPT_ERSPAN_VER])
 329                 return -EINVAL;
 330
 331         if (info) {
 332                 struct erspan_metadata *md = ip_tunnel_info_opts(info);
 333
 334                 attr = tb[LWTUNNEL_IP_OPT_ERSPAN_VER];
 335                 md->version = nla_get_u8(attr);
 336
 337                 if (md->version == 1 && tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX]) {
 338                         attr = tb[LWTUNNEL_IP_OPT_ERSPAN_INDEX];
 339                         md->u.index = nla_get_be32(attr);
 340                 } else if (md->version == 2 && tb[LWTUNNEL_IP_OPT_ERSPAN_DIR] &&
 341                            tb[LWTUNNEL_IP_OPT_ERSPAN_HWID]) {
 342                         attr = tb[LWTUNNEL_IP_OPT_ERSPAN_DIR];
 343                         md->u.md2.dir = nla_get_u8(attr);
 344                         attr = tb[LWTUNNEL_IP_OPT_ERSPAN_HWID];
 345                         set_hwid(&md->u.md2, nla_get_u8(attr));
 346                 } else {
 347                         return -EINVAL;
 348                 }
 349
 350                 info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
 351         }
 352
 353         return sizeof(struct erspan_metadata);
 354 }
 355
 356 static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info,
 357                              struct netlink_ext_ack *extack)
 358 {
 359         struct nlattr *tb[LWTUNNEL_IP_OPTS_MAX + 1];
 360         int err;
 361
 362         if (!attr)
 363                 return 0;
 364
 365         err = nla_parse_nested(tb, LWTUNNEL_IP_OPTS_MAX, attr,
 366                                ip_opts_policy, extack);
 367         if (err)
 368                 return err;
 369
 370         if (tb[LWTUNNEL_IP_OPTS_GENEVE])
 371                 err = ip_tun_parse_opts_geneve(tb[LWTUNNEL_IP_OPTS_GENEVE],
 372                                                info, extack);
 373         else if (tb[LWTUNNEL_IP_OPTS_VXLAN])
 374                 err = ip_tun_parse_opts_vxlan(tb[LWTUNNEL_IP_OPTS_VXLAN],
 375                                               info, extack);
 376         else if (tb[LWTUNNEL_IP_OPTS_ERSPAN])
 377                 err = ip_tun_parse_opts_erspan(tb[LWTUNNEL_IP_OPTS_ERSPAN],
 378                                                info, extack);
 379         else
 380                 err = -EINVAL;
 381
 382         return err;
 383 }
 384
 385 static int ip_tun_get_optlen(struct nlattr *attr,
 386                              struct netlink_ext_ack *extack)
 387 {
 388         return ip_tun_parse_opts(attr, NULL, extack);
 389 }
 390
 391 static int ip_tun_set_opts(struct nlattr *attr, struct ip_tunnel_info *info,
 392                            struct netlink_ext_ack *extack)
 393 {
 394         return ip_tun_parse_opts(attr, info, extack);
 395 }
 396
 397 static int ip_tun_build_state(struct nlattr *attr,
 398                               unsigned int family, const void *cfg,
 399                               struct lwtunnel_state **ts,
 400                               struct netlink_ext_ack *extack)
 401 {
 402         struct nlattr *tb[LWTUNNEL_IP_MAX + 1];
 403         struct lwtunnel_state *new_state;
 404         struct ip_tunnel_info *tun_info;
 405         int err, opt_len;
 406
 407         err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP_MAX, attr,
 408                                           ip_tun_policy, extack);
 409         if (err < 0)
 410                 return err;
 411
 412         opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP_OPTS], extack);
 413         if (opt_len < 0)
 414                 return opt_len;
 415
 416         new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
 417         if (!new_state)
 418                 return -ENOMEM;
 419
 420         new_state->type = LWTUNNEL_ENCAP_IP;
 421
 422         tun_info = lwt_tun_info(new_state);
 423
 424         err = ip_tun_set_opts(tb[LWTUNNEL_IP_OPTS], tun_info, extack);
 425         if (err < 0) {
 426                 lwtstate_free(new_state);
 427                 return err;
 428         }
 429
 430 #ifdef CONFIG_DST_CACHE
 431         err = dst_cache_init(&tun_info->dst_cache, GFP_KERNEL);
 432         if (err) {
 433                 lwtstate_free(new_state);
 434                 return err;
 435         }
 436 #endif
 437
 438         if (tb[LWTUNNEL_IP_ID])
 439                 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP_ID]);
 440
 441         if (tb[LWTUNNEL_IP_DST])
 442                 tun_info->key.u.ipv4.dst = nla_get_in_addr(tb[LWTUNNEL_IP_DST]);
 443
 444         if (tb[LWTUNNEL_IP_SRC])
 445                 tun_info->key.u.ipv4.src = nla_get_in_addr(tb[LWTUNNEL_IP_SRC]);
 446
 447         if (tb[LWTUNNEL_IP_TTL])
 448                 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP_TTL]);
 449
 450         if (tb[LWTUNNEL_IP_TOS])
 451                 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP_TOS]);
 452
 453         if (tb[LWTUNNEL_IP_FLAGS])
 454                 tun_info->key.tun_flags |=
 455                                 (nla_get_be16(tb[LWTUNNEL_IP_FLAGS]) &
 456                                  ~TUNNEL_OPTIONS_PRESENT);
 457
 458         tun_info->mode = IP_TUNNEL_INFO_TX;
 459         tun_info->options_len = opt_len;
 460
 461         *ts = new_state;
 462
 463         return 0;
 464 }
 465
 466 static void ip_tun_destroy_state(struct lwtunnel_state *lwtstate)
 467 {
 468 #ifdef CONFIG_DST_CACHE
 469         struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
 470
 471         dst_cache_destroy(&tun_info->dst_cache);
 472 #endif
 473 }
 474
 475 static int ip_tun_fill_encap_opts_geneve(struct sk_buff *skb,
 476                                          struct ip_tunnel_info *tun_info)
 477 {
 478         struct geneve_opt *opt;
 479         struct nlattr *nest;
 480
 481         nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_GENEVE);
 482         if (!nest)
 483                 return -ENOMEM;
 484
 485         opt = ip_tunnel_info_opts(tun_info);
 486         if (nla_put_be16(skb, LWTUNNEL_IP_OPT_GENEVE_CLASS, opt->opt_class) ||
 487             nla_put_u8(skb, LWTUNNEL_IP_OPT_GENEVE_TYPE, opt->type) ||
 488             nla_put(skb, LWTUNNEL_IP_OPT_GENEVE_DATA, opt->length * 4,
 489                     opt->opt_data)) {
 490                 nla_nest_cancel(skb, nest);
 491                 return -ENOMEM;
 492         }
 493
 494         nla_nest_end(skb, nest);
 495         return 0;
 496 }
 497
 498 static int ip_tun_fill_encap_opts_vxlan(struct sk_buff *skb,
 499                                         struct ip_tunnel_info *tun_info)
 500 {
 501         struct vxlan_metadata *md;
 502         struct nlattr *nest;
 503
 504         nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_VXLAN);
 505         if (!nest)
 506                 return -ENOMEM;
 507
 508         md = ip_tunnel_info_opts(tun_info);
 509         if (nla_put_u32(skb, LWTUNNEL_IP_OPT_VXLAN_GBP, md->gbp)) {
 510                 nla_nest_cancel(skb, nest);
 511                 return -ENOMEM;
 512         }
 513
 514         nla_nest_end(skb, nest);
 515         return 0;
 516 }
 517
 518 static int ip_tun_fill_encap_opts_erspan(struct sk_buff *skb,
 519                                          struct ip_tunnel_info *tun_info)
 520 {
 521         struct erspan_metadata *md;
 522         struct nlattr *nest;
 523
 524         nest = nla_nest_start_noflag(skb, LWTUNNEL_IP_OPTS_ERSPAN);
 525         if (!nest)
 526                 return -ENOMEM;
 527
 528         md = ip_tunnel_info_opts(tun_info);
 529         if (nla_put_u32(skb, LWTUNNEL_IP_OPT_ERSPAN_VER, md->version))
 530                 goto err;
 531
 532         if (md->version == 1 &&
 533             nla_put_be32(skb, LWTUNNEL_IP_OPT_ERSPAN_INDEX, md->u.index))
 534                 goto err;
 535
 536         if (md->version == 2 &&
 537             (nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_DIR, md->u.md2.dir) ||
 538              nla_put_u8(skb, LWTUNNEL_IP_OPT_ERSPAN_HWID,
 539                         get_hwid(&md->u.md2))))
 540                 goto err;
 541
 542         nla_nest_end(skb, nest);
 543         return 0;
 544 err:
 545         nla_nest_cancel(skb, nest);
 546         return -ENOMEM;
 547 }
 548
 549 static int ip_tun_fill_encap_opts(struct sk_buff *skb, int type,
 550                                   struct ip_tunnel_info *tun_info)
 551 {
 552         struct nlattr *nest;
 553         int err = 0;
 554
 555         if (!(tun_info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
 556                 return 0;
 557
 558         nest = nla_nest_start_noflag(skb, type);
 559         if (!nest)
 560                 return -ENOMEM;
 561
 562         if (tun_info->key.tun_flags & TUNNEL_GENEVE_OPT)
 563                 err = ip_tun_fill_encap_opts_geneve(skb, tun_info);
 564         else if (tun_info->key.tun_flags & TUNNEL_VXLAN_OPT)
 565                 err = ip_tun_fill_encap_opts_vxlan(skb, tun_info);
 566         else if (tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)
 567                 err = ip_tun_fill_encap_opts_erspan(skb, tun_info);
 568
 569         if (err) {
 570                 nla_nest_cancel(skb, nest);
 571                 return err;
 572         }
 573
 574         nla_nest_end(skb, nest);
 575         return 0;
 576 }
 577
 578 static int ip_tun_fill_encap_info(struct sk_buff *skb,
 579                                   struct lwtunnel_state *lwtstate)
 580 {
 581         struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
 582
 583         if (nla_put_be64(skb, LWTUNNEL_IP_ID, tun_info->key.tun_id,
 584                          LWTUNNEL_IP_PAD) ||
 585             nla_put_in_addr(skb, LWTUNNEL_IP_DST, tun_info->key.u.ipv4.dst) ||
 586             nla_put_in_addr(skb, LWTUNNEL_IP_SRC, tun_info->key.u.ipv4.src) ||
 587             nla_put_u8(skb, LWTUNNEL_IP_TOS, tun_info->key.tos) ||
 588             nla_put_u8(skb, LWTUNNEL_IP_TTL, tun_info->key.ttl) ||
 589             nla_put_be16(skb, LWTUNNEL_IP_FLAGS, tun_info->key.tun_flags) ||
 590             ip_tun_fill_encap_opts(skb, LWTUNNEL_IP_OPTS, tun_info))
 591                 return -ENOMEM;
 592
 593         return 0;
 594 }
 595
 596 static int ip_tun_opts_nlsize(struct ip_tunnel_info *info)
 597 {
 598         int opt_len;
 599
 600         if (!(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))
 601                 return 0;
 602
 603         opt_len = nla_total_size(0);            /* LWTUNNEL_IP_OPTS */
 604         if (info->key.tun_flags & TUNNEL_GENEVE_OPT) {
 605                 struct geneve_opt *opt = ip_tunnel_info_opts(info);
 606
 607                 opt_len += nla_total_size(0)    /* LWTUNNEL_IP_OPTS_GENEVE */
 608                            + nla_total_size(2)  /* OPT_GENEVE_CLASS */
 609                            + nla_total_size(1)  /* OPT_GENEVE_TYPE */
 610                            + nla_total_size(opt->length * 4);
 611                                                 /* OPT_GENEVE_DATA */
 612         } else if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
 613                 opt_len += nla_total_size(0)    /* LWTUNNEL_IP_OPTS_VXLAN */
 614                            + nla_total_size(4); /* OPT_VXLAN_GBP */
 615         } else if (info->key.tun_flags & TUNNEL_ERSPAN_OPT) {
 616                 struct erspan_metadata *md = ip_tunnel_info_opts(info);
 617
 618                 opt_len += nla_total_size(0)    /* LWTUNNEL_IP_OPTS_ERSPAN */
 619                            + nla_total_size(1)  /* OPT_ERSPAN_VER */
 620                            + (md->version == 1 ? nla_total_size(4)
 621                                                 /* OPT_ERSPAN_INDEX (v1) */
 622                                                : nla_total_size(1) +
 623                                                  nla_total_size(1));
 624                                                 /* OPT_ERSPAN_DIR + HWID (v2) */
 625         }
 626
 627         return opt_len;
 628 }
 629
 630 static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
 631 {
 632         return nla_total_size_64bit(8)  /* LWTUNNEL_IP_ID */
 633                 + nla_total_size(4)     /* LWTUNNEL_IP_DST */
 634                 + nla_total_size(4)     /* LWTUNNEL_IP_SRC */
 635                 + nla_total_size(1)     /* LWTUNNEL_IP_TOS */
 636                 + nla_total_size(1)     /* LWTUNNEL_IP_TTL */
 637                 + nla_total_size(2)     /* LWTUNNEL_IP_FLAGS */
 638                 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
 639                                         /* LWTUNNEL_IP_OPTS */
 640 }
 641
 642 static int ip_tun_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
 643 {
 644         struct ip_tunnel_info *info_a = lwt_tun_info(a);
 645         struct ip_tunnel_info *info_b = lwt_tun_info(b);
 646
 647         return memcmp(info_a, info_b, sizeof(info_a->key)) ||
 648                info_a->mode != info_b->mode ||
 649                info_a->options_len != info_b->options_len ||
 650                memcmp(ip_tunnel_info_opts(info_a),
 651                       ip_tunnel_info_opts(info_b), info_a->options_len);
 652 }
 653
 654 static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
 655         .build_state = ip_tun_build_state,
 656         .destroy_state = ip_tun_destroy_state,
 657         .fill_encap = ip_tun_fill_encap_info,
 658         .get_encap_size = ip_tun_encap_nlsize,
 659         .cmp_encap = ip_tun_cmp_encap,
 660         .owner = THIS_MODULE,
 661 };
 662
 663 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
 664         [LWTUNNEL_IP6_ID]               = { .type = NLA_U64 },
 665         [LWTUNNEL_IP6_DST]              = { .len = sizeof(struct in6_addr) },
 666         [LWTUNNEL_IP6_SRC]              = { .len = sizeof(struct in6_addr) },
 667         [LWTUNNEL_IP6_HOPLIMIT]         = { .type = NLA_U8 },
 668         [LWTUNNEL_IP6_TC]               = { .type = NLA_U8 },
 669         [LWTUNNEL_IP6_FLAGS]            = { .type = NLA_U16 },
 670 };
 671
 672 static int ip6_tun_build_state(struct nlattr *attr,
 673                                unsigned int family, const void *cfg,
 674                                struct lwtunnel_state **ts,
 675                                struct netlink_ext_ack *extack)
 676 {
 677         struct nlattr *tb[LWTUNNEL_IP6_MAX + 1];
 678         struct lwtunnel_state *new_state;
 679         struct ip_tunnel_info *tun_info;
 680         int err, opt_len;
 681
 682         err = nla_parse_nested_deprecated(tb, LWTUNNEL_IP6_MAX, attr,
 683                                           ip6_tun_policy, extack);
 684         if (err < 0)
 685                 return err;
 686
 687         opt_len = ip_tun_get_optlen(tb[LWTUNNEL_IP6_OPTS], extack);
 688         if (opt_len < 0)
 689                 return opt_len;
 690
 691         new_state = lwtunnel_state_alloc(sizeof(*tun_info) + opt_len);
 692         if (!new_state)
 693                 return -ENOMEM;
 694
 695         new_state->type = LWTUNNEL_ENCAP_IP6;
 696
 697         tun_info = lwt_tun_info(new_state);
 698
 699         err = ip_tun_set_opts(tb[LWTUNNEL_IP6_OPTS], tun_info, extack);
 700         if (err < 0) {
 701                 lwtstate_free(new_state);
 702                 return err;
 703         }
 704
 705         if (tb[LWTUNNEL_IP6_ID])
 706                 tun_info->key.tun_id = nla_get_be64(tb[LWTUNNEL_IP6_ID]);
 707
 708         if (tb[LWTUNNEL_IP6_DST])
 709                 tun_info->key.u.ipv6.dst = nla_get_in6_addr(tb[LWTUNNEL_IP6_DST]);
 710
 711         if (tb[LWTUNNEL_IP6_SRC])
 712                 tun_info->key.u.ipv6.src = nla_get_in6_addr(tb[LWTUNNEL_IP6_SRC]);
 713
 714         if (tb[LWTUNNEL_IP6_HOPLIMIT])
 715                 tun_info->key.ttl = nla_get_u8(tb[LWTUNNEL_IP6_HOPLIMIT]);
 716
 717         if (tb[LWTUNNEL_IP6_TC])
 718                 tun_info->key.tos = nla_get_u8(tb[LWTUNNEL_IP6_TC]);
 719
 720         if (tb[LWTUNNEL_IP6_FLAGS])
 721                 tun_info->key.tun_flags |=
 722                                 (nla_get_be16(tb[LWTUNNEL_IP6_FLAGS]) &
 723                                  ~TUNNEL_OPTIONS_PRESENT);
 724
 725         tun_info->mode = IP_TUNNEL_INFO_TX | IP_TUNNEL_INFO_IPV6;
 726         tun_info->options_len = opt_len;
 727
 728         *ts = new_state;
 729
 730         return 0;
 731 }
 732
 733 static int ip6_tun_fill_encap_info(struct sk_buff *skb,
 734                                    struct lwtunnel_state *lwtstate)
 735 {
 736         struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
 737
 738         if (nla_put_be64(skb, LWTUNNEL_IP6_ID, tun_info->key.tun_id,
 739                          LWTUNNEL_IP6_PAD) ||
 740             nla_put_in6_addr(skb, LWTUNNEL_IP6_DST, &tun_info->key.u.ipv6.dst) ||
 741             nla_put_in6_addr(skb, LWTUNNEL_IP6_SRC, &tun_info->key.u.ipv6.src) ||
 742             nla_put_u8(skb, LWTUNNEL_IP6_TC, tun_info->key.tos) ||
 743             nla_put_u8(skb, LWTUNNEL_IP6_HOPLIMIT, tun_info->key.ttl) ||
 744             nla_put_be16(skb, LWTUNNEL_IP6_FLAGS, tun_info->key.tun_flags) ||
 745             ip_tun_fill_encap_opts(skb, LWTUNNEL_IP6_OPTS, tun_info))
 746                 return -ENOMEM;
 747
 748         return 0;
 749 }
 750
 751 static int ip6_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
 752 {
 753         return nla_total_size_64bit(8)  /* LWTUNNEL_IP6_ID */
 754                 + nla_total_size(16)    /* LWTUNNEL_IP6_DST */
 755                 + nla_total_size(16)    /* LWTUNNEL_IP6_SRC */
 756                 + nla_total_size(1)     /* LWTUNNEL_IP6_HOPLIMIT */
 757                 + nla_total_size(1)     /* LWTUNNEL_IP6_TC */
 758                 + nla_total_size(2)     /* LWTUNNEL_IP6_FLAGS */
 759                 + ip_tun_opts_nlsize(lwt_tun_info(lwtstate));
 760                                         /* LWTUNNEL_IP6_OPTS */
 761 }
 762
 763 static const struct lwtunnel_encap_ops ip6_tun_lwt_ops = {
 764         .build_state = ip6_tun_build_state,
 765         .fill_encap = ip6_tun_fill_encap_info,
 766         .get_encap_size = ip6_tun_encap_nlsize,
 767         .cmp_encap = ip_tun_cmp_encap,
 768         .owner = THIS_MODULE,
 769 };
 770
 771 void __init ip_tunnel_core_init(void)
 772 {
 773         /* If you land here, make sure whether increasing ip_tunnel_info's
 774          * options_len is a reasonable choice with its usage in front ends
 775          * (f.e., it's part of flow keys, etc).
 776          */
 777         BUILD_BUG_ON(IP_TUNNEL_OPTS_MAX != 255);
 778
 779         lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
 780         lwtunnel_encap_add_ops(&ip6_tun_lwt_ops, LWTUNNEL_ENCAP_IP6);
 781 }
 782
 783 DEFINE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt);
 784 EXPORT_SYMBOL(ip_tunnel_metadata_cnt);
 785
 786 void ip_tunnel_need_metadata(void)
 787 {
 788         static_branch_inc(&ip_tunnel_metadata_cnt);
 789 }
 790 EXPORT_SYMBOL_GPL(ip_tunnel_need_metadata);
 791
 792 void ip_tunnel_unneed_metadata(void)
 793 {
 794         static_branch_dec(&ip_tunnel_metadata_cnt);
 795 }
 796 EXPORT_SYMBOL_GPL(ip_tunnel_unneed_metadata);