net/ipv6/ip6_gre.c

   1 /*
   2  *      GRE over IPv6 protocol decoder.
   3  *
   4  *      Authors: Dmitry Kozlov (xeb@mail.ru)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  *
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/capability.h>
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/slab.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/in.h>
  24 #include <linux/tcp.h>
  25 #include <linux/udp.h>
  26 #include <linux/if_arp.h>
  27 #include <linux/init.h>
  28 #include <linux/in6.h>
  29 #include <linux/inetdevice.h>
  30 #include <linux/igmp.h>
  31 #include <linux/netfilter_ipv4.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/if_ether.h>
  34 #include <linux/hash.h>
  35 #include <linux/if_tunnel.h>
  36 #include <linux/ip6_tunnel.h>
  37
  38 #include <net/sock.h>
  39 #include <net/ip.h>
  40 #include <net/ip_tunnels.h>
  41 #include <net/icmp.h>
  42 #include <net/protocol.h>
  43 #include <net/addrconf.h>
  44 #include <net/arp.h>
  45 #include <net/checksum.h>
  46 #include <net/dsfield.h>
  47 #include <net/inet_ecn.h>
  48 #include <net/xfrm.h>
  49 #include <net/net_namespace.h>
  50 #include <net/netns/generic.h>
  51 #include <net/rtnetlink.h>
  52
  53 #include <net/ipv6.h>
  54 #include <net/ip6_fib.h>
  55 #include <net/ip6_route.h>
  56 #include <net/ip6_tunnel.h>
  57 #include <net/gre.h>
  58 #include <net/erspan.h>
  59 #include <net/dst_metadata.h>
  60
  61
  62 static bool log_ecn_error = true;
  63 module_param(log_ecn_error, bool, 0644);
  64 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  65
  66 #define IP6_GRE_HASH_SIZE_SHIFT  5
  67 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
  68
  69 static unsigned int ip6gre_net_id __read_mostly;
  70 struct ip6gre_net {
  71         struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
  72
  73         struct ip6_tnl __rcu *collect_md_tun;
  74         struct ip6_tnl __rcu *collect_md_tun_erspan;
  75         struct net_device *fb_tunnel_dev;
  76 };
  77
  78 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
  79 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
  80 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
  81 static int ip6gre_tunnel_init(struct net_device *dev);
  82 static void ip6gre_tunnel_setup(struct net_device *dev);
  83 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
  84 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  85 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  86
  87 /* Tunnel hash table */
  88
  89 /*
  90    4 hash tables:
  91
  92    3: (remote,local)
  93    2: (remote,*)
  94    1: (*,local)
  95    0: (*,*)
  96
  97    We require exact key match i.e. if a key is present in packet
  98    it will match only tunnel with the same key; if it is not present,
  99    it will match only keyless tunnel.
 100
 101    All keysless packets, if not matched configured keyless tunnels
 102    will match fallback tunnel.
 103  */
 104
 105 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
 106 static u32 HASH_ADDR(const struct in6_addr *addr)
 107 {
 108         u32 hash = ipv6_addr_hash(addr);
 109
 110         return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
 111 }
 112
 113 #define tunnels_r_l     tunnels[3]
 114 #define tunnels_r       tunnels[2]
 115 #define tunnels_l       tunnels[1]
 116 #define tunnels_wc      tunnels[0]
 117
 118 /* Given src, dst and key, find appropriate for input tunnel. */
 119
 120 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
 121                 const struct in6_addr *remote, const struct in6_addr *local,
 122                 __be32 key, __be16 gre_proto)
 123 {
 124         struct net *net = dev_net(dev);
 125         int link = dev->ifindex;
 126         unsigned int h0 = HASH_ADDR(remote);
 127         unsigned int h1 = HASH_KEY(key);
 128         struct ip6_tnl *t, *cand = NULL;
 129         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 130         int dev_type = (gre_proto == htons(ETH_P_TEB) ||
 131                         gre_proto == htons(ETH_P_ERSPAN) ||
 132                         gre_proto == htons(ETH_P_ERSPAN2)) ?
 133                        ARPHRD_ETHER : ARPHRD_IP6GRE;
 134         int score, cand_score = 4;
 135
 136         for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
 137                 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
 138                     !ipv6_addr_equal(remote, &t->parms.raddr) ||
 139                     key != t->parms.i_key ||
 140                     !(t->dev->flags & IFF_UP))
 141                         continue;
 142
 143                 if (t->dev->type != ARPHRD_IP6GRE &&
 144                     t->dev->type != dev_type)
 145                         continue;
 146
 147                 score = 0;
 148                 if (t->parms.link != link)
 149                         score |= 1;
 150                 if (t->dev->type != dev_type)
 151                         score |= 2;
 152                 if (score == 0)
 153                         return t;
 154
 155                 if (score < cand_score) {
 156                         cand = t;
 157                         cand_score = score;
 158                 }
 159         }
 160
 161         for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
 162                 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
 163                     key != t->parms.i_key ||
 164                     !(t->dev->flags & IFF_UP))
 165                         continue;
 166
 167                 if (t->dev->type != ARPHRD_IP6GRE &&
 168                     t->dev->type != dev_type)
 169                         continue;
 170
 171                 score = 0;
 172                 if (t->parms.link != link)
 173                         score |= 1;
 174                 if (t->dev->type != dev_type)
 175                         score |= 2;
 176                 if (score == 0)
 177                         return t;
 178
 179                 if (score < cand_score) {
 180                         cand = t;
 181                         cand_score = score;
 182                 }
 183         }
 184
 185         for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
 186                 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
 187                           (!ipv6_addr_equal(local, &t->parms.raddr) ||
 188                                  !ipv6_addr_is_multicast(local))) ||
 189                     key != t->parms.i_key ||
 190                     !(t->dev->flags & IFF_UP))
 191                         continue;
 192
 193                 if (t->dev->type != ARPHRD_IP6GRE &&
 194                     t->dev->type != dev_type)
 195                         continue;
 196
 197                 score = 0;
 198                 if (t->parms.link != link)
 199                         score |= 1;
 200                 if (t->dev->type != dev_type)
 201                         score |= 2;
 202                 if (score == 0)
 203                         return t;
 204
 205                 if (score < cand_score) {
 206                         cand = t;
 207                         cand_score = score;
 208                 }
 209         }
 210
 211         for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
 212                 if (t->parms.i_key != key ||
 213                     !(t->dev->flags & IFF_UP))
 214                         continue;
 215
 216                 if (t->dev->type != ARPHRD_IP6GRE &&
 217                     t->dev->type != dev_type)
 218                         continue;
 219
 220                 score = 0;
 221                 if (t->parms.link != link)
 222                         score |= 1;
 223                 if (t->dev->type != dev_type)
 224                         score |= 2;
 225                 if (score == 0)
 226                         return t;
 227
 228                 if (score < cand_score) {
 229                         cand = t;
 230                         cand_score = score;
 231                 }
 232         }
 233
 234         if (cand)
 235                 return cand;
 236
 237         if (gre_proto == htons(ETH_P_ERSPAN) ||
 238             gre_proto == htons(ETH_P_ERSPAN2))
 239                 t = rcu_dereference(ign->collect_md_tun_erspan);
 240         else
 241                 t = rcu_dereference(ign->collect_md_tun);
 242
 243         if (t && t->dev->flags & IFF_UP)
 244                 return t;
 245
 246         dev = ign->fb_tunnel_dev;
 247         if (dev && dev->flags & IFF_UP)
 248                 return netdev_priv(dev);
 249
 250         return NULL;
 251 }
 252
 253 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
 254                 const struct __ip6_tnl_parm *p)
 255 {
 256         const struct in6_addr *remote = &p->raddr;
 257         const struct in6_addr *local = &p->laddr;
 258         unsigned int h = HASH_KEY(p->i_key);
 259         int prio = 0;
 260
 261         if (!ipv6_addr_any(local))
 262                 prio |= 1;
 263         if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
 264                 prio |= 2;
 265                 h ^= HASH_ADDR(remote);
 266         }
 267
 268         return &ign->tunnels[prio][h];
 269 }
 270
 271 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 272 {
 273         if (t->parms.collect_md)
 274                 rcu_assign_pointer(ign->collect_md_tun, t);
 275 }
 276
 277 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 278 {
 279         if (t->parms.collect_md)
 280                 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
 281 }
 282
 283 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 284 {
 285         if (t->parms.collect_md)
 286                 rcu_assign_pointer(ign->collect_md_tun, NULL);
 287 }
 288
 289 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
 290                                        struct ip6_tnl *t)
 291 {
 292         if (t->parms.collect_md)
 293                 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
 294 }
 295
 296 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
 297                 const struct ip6_tnl *t)
 298 {
 299         return __ip6gre_bucket(ign, &t->parms);
 300 }
 301
 302 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
 303 {
 304         struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
 305
 306         rcu_assign_pointer(t->next, rtnl_dereference(*tp));
 307         rcu_assign_pointer(*tp, t);
 308 }
 309
 310 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
 311 {
 312         struct ip6_tnl __rcu **tp;
 313         struct ip6_tnl *iter;
 314
 315         for (tp = ip6gre_bucket(ign, t);
 316              (iter = rtnl_dereference(*tp)) != NULL;
 317              tp = &iter->next) {
 318                 if (t == iter) {
 319                         rcu_assign_pointer(*tp, t->next);
 320                         break;
 321                 }
 322         }
 323 }
 324
 325 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
 326                                            const struct __ip6_tnl_parm *parms,
 327                                            int type)
 328 {
 329         const struct in6_addr *remote = &parms->raddr;
 330         const struct in6_addr *local = &parms->laddr;
 331         __be32 key = parms->i_key;
 332         int link = parms->link;
 333         struct ip6_tnl *t;
 334         struct ip6_tnl __rcu **tp;
 335         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 336
 337         for (tp = __ip6gre_bucket(ign, parms);
 338              (t = rtnl_dereference(*tp)) != NULL;
 339              tp = &t->next)
 340                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
 341                     ipv6_addr_equal(remote, &t->parms.raddr) &&
 342                     key == t->parms.i_key &&
 343                     link == t->parms.link &&
 344                     type == t->dev->type)
 345                         break;
 346
 347         return t;
 348 }
 349
 350 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
 351                 const struct __ip6_tnl_parm *parms, int create)
 352 {
 353         struct ip6_tnl *t, *nt;
 354         struct net_device *dev;
 355         char name[IFNAMSIZ];
 356         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 357
 358         t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
 359         if (t && create)
 360                 return NULL;
 361         if (t || !create)
 362                 return t;
 363
 364         if (parms->name[0]) {
 365                 if (!dev_valid_name(parms->name))
 366                         return NULL;
 367                 strlcpy(name, parms->name, IFNAMSIZ);
 368         } else {
 369                 strcpy(name, "ip6gre%d");
 370         }
 371         dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
 372                            ip6gre_tunnel_setup);
 373         if (!dev)
 374                 return NULL;
 375
 376         dev_net_set(dev, net);
 377
 378         nt = netdev_priv(dev);
 379         nt->parms = *parms;
 380         dev->rtnl_link_ops = &ip6gre_link_ops;
 381
 382         nt->dev = dev;
 383         nt->net = dev_net(dev);
 384
 385         if (register_netdevice(dev) < 0)
 386                 goto failed_free;
 387
 388         ip6gre_tnl_link_config(nt, 1);
 389
 390         /* Can use a lockless transmit, unless we generate output sequences */
 391         if (!(nt->parms.o_flags & TUNNEL_SEQ))
 392                 dev->features |= NETIF_F_LLTX;
 393
 394         dev_hold(dev);
 395         ip6gre_tunnel_link(ign, nt);
 396         return nt;
 397
 398 failed_free:
 399         free_netdev(dev);
 400         return NULL;
 401 }
 402
 403 static void ip6erspan_tunnel_uninit(struct net_device *dev)
 404 {
 405         struct ip6_tnl *t = netdev_priv(dev);
 406         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 407
 408         ip6erspan_tunnel_unlink_md(ign, t);
 409         ip6gre_tunnel_unlink(ign, t);
 410         dst_cache_reset(&t->dst_cache);
 411         dev_put(dev);
 412 }
 413
 414 static void ip6gre_tunnel_uninit(struct net_device *dev)
 415 {
 416         struct ip6_tnl *t = netdev_priv(dev);
 417         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 418
 419         ip6gre_tunnel_unlink_md(ign, t);
 420         ip6gre_tunnel_unlink(ign, t);
 421         dst_cache_reset(&t->dst_cache);
 422         dev_put(dev);
 423 }
 424
 425
 426 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 427                        u8 type, u8 code, int offset, __be32 info)
 428 {
 429         struct net *net = dev_net(skb->dev);
 430         const struct ipv6hdr *ipv6h;
 431         struct tnl_ptk_info tpi;
 432         struct ip6_tnl *t;
 433
 434         if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
 435                              offset) < 0)
 436                 return -EINVAL;
 437
 438         ipv6h = (const struct ipv6hdr *)skb->data;
 439         t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
 440                                  tpi.key, tpi.proto);
 441         if (!t)
 442                 return -ENOENT;
 443
 444         switch (type) {
 445                 struct ipv6_tlv_tnl_enc_lim *tel;
 446                 __u32 teli;
 447         case ICMPV6_DEST_UNREACH:
 448                 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
 449                                     t->parms.name);
 450                 if (code != ICMPV6_PORT_UNREACH)
 451                         break;
 452                 return 0;
 453         case ICMPV6_TIME_EXCEED:
 454                 if (code == ICMPV6_EXC_HOPLIMIT) {
 455                         net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
 456                                             t->parms.name);
 457                         break;
 458                 }
 459                 return 0;
 460         case ICMPV6_PARAMPROB:
 461                 teli = 0;
 462                 if (code == ICMPV6_HDR_FIELD)
 463                         teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
 464
 465                 if (teli && teli == be32_to_cpu(info) - 2) {
 466                         tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
 467                         if (tel->encap_limit == 0) {
 468                                 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
 469                                                     t->parms.name);
 470                         }
 471                 } else {
 472                         net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
 473                                             t->parms.name);
 474                 }
 475                 return 0;
 476         case ICMPV6_PKT_TOOBIG:
 477                 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
 478                 return 0;
 479         case NDISC_REDIRECT:
 480                 ip6_redirect(skb, net, skb->dev->ifindex, 0,
 481                              sock_net_uid(net, NULL));
 482                 return 0;
 483         }
 484
 485         if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
 486                 t->err_count++;
 487         else
 488                 t->err_count = 1;
 489         t->err_time = jiffies;
 490
 491         return 0;
 492 }
 493
 494 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
 495 {
 496         const struct ipv6hdr *ipv6h;
 497         struct ip6_tnl *tunnel;
 498
 499         ipv6h = ipv6_hdr(skb);
 500         tunnel = ip6gre_tunnel_lookup(skb->dev,
 501                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 502                                       tpi->proto);
 503         if (tunnel) {
 504                 if (tunnel->parms.collect_md) {
 505                         struct metadata_dst *tun_dst;
 506                         __be64 tun_id;
 507                         __be16 flags;
 508
 509                         flags = tpi->flags;
 510                         tun_id = key32_to_tunnel_id(tpi->key);
 511
 512                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
 513                         if (!tun_dst)
 514                                 return PACKET_REJECT;
 515
 516                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 517                 } else {
 518                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 519                 }
 520
 521                 return PACKET_RCVD;
 522         }
 523
 524         return PACKET_REJECT;
 525 }
 526
 527 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
 528                          struct tnl_ptk_info *tpi)
 529 {
 530         struct erspan_base_hdr *ershdr;
 531         struct erspan_metadata *pkt_md;
 532         const struct ipv6hdr *ipv6h;
 533         struct erspan_md2 *md2;
 534         struct ip6_tnl *tunnel;
 535         u8 ver;
 536
 537         if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
 538                 return PACKET_REJECT;
 539
 540         ipv6h = ipv6_hdr(skb);
 541         ershdr = (struct erspan_base_hdr *)skb->data;
 542         ver = ershdr->ver;
 543         tpi->key = cpu_to_be32(get_session_id(ershdr));
 544
 545         tunnel = ip6gre_tunnel_lookup(skb->dev,
 546                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 547                                       tpi->proto);
 548         if (tunnel) {
 549                 int len = erspan_hdr_len(ver);
 550
 551                 if (unlikely(!pskb_may_pull(skb, len)))
 552                         return PACKET_REJECT;
 553
 554                 ershdr = (struct erspan_base_hdr *)skb->data;
 555                 pkt_md = (struct erspan_metadata *)(ershdr + 1);
 556
 557                 if (__iptunnel_pull_header(skb, len,
 558                                            htons(ETH_P_TEB),
 559                                            false, false) < 0)
 560                         return PACKET_REJECT;
 561
 562                 if (tunnel->parms.collect_md) {
 563                         struct metadata_dst *tun_dst;
 564                         struct ip_tunnel_info *info;
 565                         struct erspan_metadata *md;
 566                         __be64 tun_id;
 567                         __be16 flags;
 568
 569                         tpi->flags |= TUNNEL_KEY;
 570                         flags = tpi->flags;
 571                         tun_id = key32_to_tunnel_id(tpi->key);
 572
 573                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
 574                                                   sizeof(*md));
 575                         if (!tun_dst)
 576                                 return PACKET_REJECT;
 577
 578                         info = &tun_dst->u.tun_info;
 579                         md = ip_tunnel_info_opts(info);
 580                         md->version = ver;
 581                         md2 = &md->u.md2;
 582                         memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
 583                                                        ERSPAN_V2_MDSIZE);
 584                         info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
 585                         info->options_len = sizeof(*md);
 586
 587                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 588
 589                 } else {
 590                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 591                 }
 592
 593                 return PACKET_RCVD;
 594         }
 595
 596         return PACKET_REJECT;
 597 }
 598
 599 static int gre_rcv(struct sk_buff *skb)
 600 {
 601         struct tnl_ptk_info tpi;
 602         bool csum_err = false;
 603         int hdr_len;
 604
 605         hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
 606         if (hdr_len < 0)
 607                 goto drop;
 608
 609         if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 610                 goto drop;
 611
 612         if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
 613                      tpi.proto == htons(ETH_P_ERSPAN2))) {
 614                 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
 615                         return 0;
 616                 goto out;
 617         }
 618
 619         if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 620                 return 0;
 621
 622 out:
 623         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 624 drop:
 625         kfree_skb(skb);
 626         return 0;
 627 }
 628
 629 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 630 {
 631         return iptunnel_handle_offloads(skb,
 632                                         csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 633 }
 634
 635 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
 636                                      struct net_device *dev,
 637                                      struct flowi6 *fl6, __u8 *dsfield,
 638                                      int *encap_limit)
 639 {
 640         const struct iphdr *iph = ip_hdr(skb);
 641         struct ip6_tnl *t = netdev_priv(dev);
 642
 643         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 644                 *encap_limit = t->parms.encap_limit;
 645
 646         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 647
 648         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 649                 *dsfield = ipv4_get_dsfield(iph);
 650         else
 651                 *dsfield = ip6_tclass(t->parms.flowinfo);
 652
 653         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 654                 fl6->flowi6_mark = skb->mark;
 655         else
 656                 fl6->flowi6_mark = t->parms.fwmark;
 657
 658         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 659 }
 660
 661 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
 662                                     struct net_device *dev,
 663                                     struct flowi6 *fl6, __u8 *dsfield,
 664                                     int *encap_limit)
 665 {
 666         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 667         struct ip6_tnl *t = netdev_priv(dev);
 668         __u16 offset;
 669
 670         offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
 671         /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
 672
 673         if (offset > 0) {
 674                 struct ipv6_tlv_tnl_enc_lim *tel;
 675
 676                 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
 677                 if (tel->encap_limit == 0) {
 678                         icmpv6_send(skb, ICMPV6_PARAMPROB,
 679                                     ICMPV6_HDR_FIELD, offset + 2);
 680                         return -1;
 681                 }
 682                 *encap_limit = tel->encap_limit - 1;
 683         } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
 684                 *encap_limit = t->parms.encap_limit;
 685         }
 686
 687         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 688
 689         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 690                 *dsfield = ipv6_get_dsfield(ipv6h);
 691         else
 692                 *dsfield = ip6_tclass(t->parms.flowinfo);
 693
 694         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 695                 fl6->flowlabel |= ip6_flowlabel(ipv6h);
 696
 697         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 698                 fl6->flowi6_mark = skb->mark;
 699         else
 700                 fl6->flowi6_mark = t->parms.fwmark;
 701
 702         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 703
 704         return 0;
 705 }
 706
 707 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
 708                                struct net_device *dev, __u8 dsfield,
 709                                struct flowi6 *fl6, int encap_limit,
 710                                __u32 *pmtu, __be16 proto)
 711 {
 712         struct ip6_tnl *tunnel = netdev_priv(dev);
 713         __be16 protocol;
 714
 715         if (dev->type == ARPHRD_ETHER)
 716                 IPCB(skb)->flags = 0;
 717
 718         if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
 719                 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
 720         else
 721                 fl6->daddr = tunnel->parms.raddr;
 722
 723         if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
 724                 return -ENOMEM;
 725
 726         /* Push GRE header. */
 727         protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
 728
 729         if (tunnel->parms.collect_md) {
 730                 struct ip_tunnel_info *tun_info;
 731                 const struct ip_tunnel_key *key;
 732                 __be16 flags;
 733
 734                 tun_info = skb_tunnel_info(skb);
 735                 if (unlikely(!tun_info ||
 736                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
 737                              ip_tunnel_info_af(tun_info) != AF_INET6))
 738                         return -EINVAL;
 739
 740                 key = &tun_info->key;
 741                 memset(fl6, 0, sizeof(*fl6));
 742                 fl6->flowi6_proto = IPPROTO_GRE;
 743                 fl6->daddr = key->u.ipv6.dst;
 744                 fl6->flowlabel = key->label;
 745                 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 746
 747                 dsfield = key->tos;
 748                 flags = key->tun_flags &
 749                         (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
 750                 tunnel->tun_hlen = gre_calc_hlen(flags);
 751
 752                 gre_build_header(skb, tunnel->tun_hlen,
 753                                  flags, protocol,
 754                                  tunnel_id_to_key32(tun_info->key.tun_id),
 755                                  (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
 756                                                       : 0);
 757
 758         } else {
 759                 if (tunnel->parms.o_flags & TUNNEL_SEQ)
 760                         tunnel->o_seqno++;
 761
 762                 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
 763                                  protocol, tunnel->parms.o_key,
 764                                  htonl(tunnel->o_seqno));
 765         }
 766
 767         return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
 768                             NEXTHDR_GRE);
 769 }
 770
 771 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
 772 {
 773         struct ip6_tnl *t = netdev_priv(dev);
 774         int encap_limit = -1;
 775         struct flowi6 fl6;
 776         __u8 dsfield = 0;
 777         __u32 mtu;
 778         int err;
 779
 780         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 781
 782         if (!t->parms.collect_md)
 783                 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
 784                                          &dsfield, &encap_limit);
 785
 786         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 787         if (err)
 788                 return -1;
 789
 790         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
 791                           skb->protocol);
 792         if (err != 0) {
 793                 /* XXX: send ICMP error even if DF is not set. */
 794                 if (err == -EMSGSIZE)
 795                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 796                                   htonl(mtu));
 797                 return -1;
 798         }
 799
 800         return 0;
 801 }
 802
 803 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
 804 {
 805         struct ip6_tnl *t = netdev_priv(dev);
 806         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 807         int encap_limit = -1;
 808         struct flowi6 fl6;
 809         __u8 dsfield = 0;
 810         __u32 mtu;
 811         int err;
 812
 813         if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
 814                 return -1;
 815
 816         if (!t->parms.collect_md &&
 817             prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
 818                 return -1;
 819
 820         if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
 821                 return -1;
 822
 823         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
 824                           &mtu, skb->protocol);
 825         if (err != 0) {
 826                 if (err == -EMSGSIZE)
 827                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 828                 return -1;
 829         }
 830
 831         return 0;
 832 }
 833
 834 /**
 835  * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
 836  *   @t: the outgoing tunnel device
 837  *   @hdr: IPv6 header from the incoming packet
 838  *
 839  * Description:
 840  *   Avoid trivial tunneling loop by checking that tunnel exit-point
 841  *   doesn't match source of incoming packet.
 842  *
 843  * Return:
 844  *   1 if conflict,
 845  *   0 else
 846  **/
 847
 848 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
 849         const struct ipv6hdr *hdr)
 850 {
 851         return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
 852 }
 853
 854 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
 855 {
 856         struct ip6_tnl *t = netdev_priv(dev);
 857         int encap_limit = -1;
 858         struct flowi6 fl6;
 859         __u32 mtu;
 860         int err;
 861
 862         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 863                 encap_limit = t->parms.encap_limit;
 864
 865         if (!t->parms.collect_md)
 866                 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
 867
 868         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 869         if (err)
 870                 return err;
 871
 872         err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
 873
 874         return err;
 875 }
 876
 877 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
 878         struct net_device *dev)
 879 {
 880         struct ip6_tnl *t = netdev_priv(dev);
 881         struct net_device_stats *stats = &t->dev->stats;
 882         int ret;
 883
 884         if (!pskb_inet_may_pull(skb))
 885                 goto tx_err;
 886
 887         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 888                 goto tx_err;
 889
 890         switch (skb->protocol) {
 891         case htons(ETH_P_IP):
 892                 ret = ip6gre_xmit_ipv4(skb, dev);
 893                 break;
 894         case htons(ETH_P_IPV6):
 895                 ret = ip6gre_xmit_ipv6(skb, dev);
 896                 break;
 897         default:
 898                 ret = ip6gre_xmit_other(skb, dev);
 899                 break;
 900         }
 901
 902         if (ret < 0)
 903                 goto tx_err;
 904
 905         return NETDEV_TX_OK;
 906
 907 tx_err:
 908         stats->tx_errors++;
 909         stats->tx_dropped++;
 910         kfree_skb(skb);
 911         return NETDEV_TX_OK;
 912 }
 913
 914 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 915                                          struct net_device *dev)
 916 {
 917         struct ip6_tnl *t = netdev_priv(dev);
 918         struct dst_entry *dst = skb_dst(skb);
 919         struct net_device_stats *stats;
 920         bool truncate = false;
 921         int encap_limit = -1;
 922         __u8 dsfield = false;
 923         struct flowi6 fl6;
 924         int err = -EINVAL;
 925         __u32 mtu;
 926         int nhoff;
 927         int thoff;
 928
 929         if (!pskb_inet_may_pull(skb))
 930                 goto tx_err;
 931
 932         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 933                 goto tx_err;
 934
 935         if (gre_handle_offloads(skb, false))
 936                 goto tx_err;
 937
 938         if (skb->len > dev->mtu + dev->hard_header_len) {
 939                 pskb_trim(skb, dev->mtu + dev->hard_header_len);
 940                 truncate = true;
 941         }
 942
 943         nhoff = skb_network_header(skb) - skb_mac_header(skb);
 944         if (skb->protocol == htons(ETH_P_IP) &&
 945             (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
 946                 truncate = true;
 947
 948         thoff = skb_transport_header(skb) - skb_mac_header(skb);
 949         if (skb->protocol == htons(ETH_P_IPV6) &&
 950             (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
 951                 truncate = true;
 952
 953         if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
 954                 goto tx_err;
 955
 956         t->parms.o_flags &= ~TUNNEL_KEY;
 957         IPCB(skb)->flags = 0;
 958
 959         /* For collect_md mode, derive fl6 from the tunnel key,
 960          * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
 961          */
 962         if (t->parms.collect_md) {
 963                 struct ip_tunnel_info *tun_info;
 964                 const struct ip_tunnel_key *key;
 965                 struct erspan_metadata *md;
 966                 __be32 tun_id;
 967
 968                 tun_info = skb_tunnel_info(skb);
 969                 if (unlikely(!tun_info ||
 970                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
 971                              ip_tunnel_info_af(tun_info) != AF_INET6))
 972                         return -EINVAL;
 973
 974                 key = &tun_info->key;
 975                 memset(&fl6, 0, sizeof(fl6));
 976                 fl6.flowi6_proto = IPPROTO_GRE;
 977                 fl6.daddr = key->u.ipv6.dst;
 978                 fl6.flowlabel = key->label;
 979                 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 980
 981                 dsfield = key->tos;
 982                 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
 983                         goto tx_err;
 984                 md = ip_tunnel_info_opts(tun_info);
 985                 if (!md)
 986                         goto tx_err;
 987
 988                 tun_id = tunnel_id_to_key32(key->tun_id);
 989                 if (md->version == 1) {
 990                         erspan_build_header(skb,
 991                                             ntohl(tun_id),
 992                                             ntohl(md->u.index), truncate,
 993                                             false);
 994                 } else if (md->version == 2) {
 995                         erspan_build_header_v2(skb,
 996                                                ntohl(tun_id),
 997                                                md->u.md2.dir,
 998                                                get_hwid(&md->u.md2),
 999                                                truncate, false);
1000                 } else {
1001                         goto tx_err;
1002                 }
1003         } else {
1004                 switch (skb->protocol) {
1005                 case htons(ETH_P_IP):
1006                         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1007                         prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1008                                                  &dsfield, &encap_limit);
1009                         break;
1010                 case htons(ETH_P_IPV6):
1011                         if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1012                                 goto tx_err;
1013                         if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1014                                                      &dsfield, &encap_limit))
1015                                 goto tx_err;
1016                         break;
1017                 default:
1018                         memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1019                         break;
1020                 }
1021
1022                 if (t->parms.erspan_ver == 1)
1023                         erspan_build_header(skb, ntohl(t->parms.o_key),
1024                                             t->parms.index,
1025                                             truncate, false);
1026                 else if (t->parms.erspan_ver == 2)
1027                         erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1028                                                t->parms.dir,
1029                                                t->parms.hwid,
1030                                                truncate, false);
1031                 else
1032                         goto tx_err;
1033
1034                 fl6.daddr = t->parms.raddr;
1035         }
1036
1037         /* Push GRE header. */
1038         gre_build_header(skb, 8, TUNNEL_SEQ,
1039                          htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
1040
1041         /* TooBig packet may have updated dst->dev's mtu */
1042         if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1043                 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1044
1045         err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1046                            NEXTHDR_GRE);
1047         if (err != 0) {
1048                 /* XXX: send ICMP error even if DF is not set. */
1049                 if (err == -EMSGSIZE) {
1050                         if (skb->protocol == htons(ETH_P_IP))
1051                                 icmp_send(skb, ICMP_DEST_UNREACH,
1052                                           ICMP_FRAG_NEEDED, htonl(mtu));
1053                         else
1054                                 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1055                 }
1056
1057                 goto tx_err;
1058         }
1059         return NETDEV_TX_OK;
1060
1061 tx_err:
1062         stats = &t->dev->stats;
1063         stats->tx_errors++;
1064         stats->tx_dropped++;
1065         kfree_skb(skb);
1066         return NETDEV_TX_OK;
1067 }
1068
1069 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1070 {
1071         struct net_device *dev = t->dev;
1072         struct __ip6_tnl_parm *p = &t->parms;
1073         struct flowi6 *fl6 = &t->fl.u.ip6;
1074
1075         if (dev->type != ARPHRD_ETHER) {
1076                 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1077                 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1078         }
1079
1080         /* Set up flowi template */
1081         fl6->saddr = p->laddr;
1082         fl6->daddr = p->raddr;
1083         fl6->flowi6_oif = p->link;
1084         fl6->flowlabel = 0;
1085         fl6->flowi6_proto = IPPROTO_GRE;
1086
1087         if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1088                 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1089         if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1090                 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1091
1092         p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1093         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1094
1095         if (p->flags&IP6_TNL_F_CAP_XMIT &&
1096                         p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1097                 dev->flags |= IFF_POINTOPOINT;
1098         else
1099                 dev->flags &= ~IFF_POINTOPOINT;
1100 }
1101
1102 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1103                                          int t_hlen)
1104 {
1105         const struct __ip6_tnl_parm *p = &t->parms;
1106         struct net_device *dev = t->dev;
1107
1108         if (p->flags & IP6_TNL_F_CAP_XMIT) {
1109                 int strict = (ipv6_addr_type(&p->raddr) &
1110                               (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1111
1112                 struct rt6_info *rt = rt6_lookup(t->net,
1113                                                  &p->raddr, &p->laddr,
1114                                                  p->link, NULL, strict);
1115
1116                 if (!rt)
1117                         return;
1118
1119                 if (rt->dst.dev) {
1120                         dev->needed_headroom = rt->dst.dev->hard_header_len +
1121                                                t_hlen;
1122
1123                         if (set_mtu) {
1124                                 dev->mtu = rt->dst.dev->mtu - t_hlen;
1125                                 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1126                                         dev->mtu -= 8;
1127                                 if (dev->type == ARPHRD_ETHER)
1128                                         dev->mtu -= ETH_HLEN;
1129
1130                                 if (dev->mtu < IPV6_MIN_MTU)
1131                                         dev->mtu = IPV6_MIN_MTU;
1132                         }
1133                 }
1134                 ip6_rt_put(rt);
1135         }
1136 }
1137
1138 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1139 {
1140         int t_hlen;
1141
1142         tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1143         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1144
1145         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1146         tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1147         return t_hlen;
1148 }
1149
1150 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1151 {
1152         ip6gre_tnl_link_config_common(t);
1153         ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1154 }
1155
1156 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1157                                      const struct __ip6_tnl_parm *p)
1158 {
1159         t->parms.laddr = p->laddr;
1160         t->parms.raddr = p->raddr;
1161         t->parms.flags = p->flags;
1162         t->parms.hop_limit = p->hop_limit;
1163         t->parms.encap_limit = p->encap_limit;
1164         t->parms.flowinfo = p->flowinfo;
1165         t->parms.link = p->link;
1166         t->parms.proto = p->proto;
1167         t->parms.i_key = p->i_key;
1168         t->parms.o_key = p->o_key;
1169         t->parms.i_flags = p->i_flags;
1170         t->parms.o_flags = p->o_flags;
1171         t->parms.fwmark = p->fwmark;
1172         dst_cache_reset(&t->dst_cache);
1173 }
1174
1175 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1176                              int set_mtu)
1177 {
1178         ip6gre_tnl_copy_tnl_parm(t, p);
1179         ip6gre_tnl_link_config(t, set_mtu);
1180         return 0;
1181 }
1182
1183 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1184         const struct ip6_tnl_parm2 *u)
1185 {
1186         p->laddr = u->laddr;
1187         p->raddr = u->raddr;
1188         p->flags = u->flags;
1189         p->hop_limit = u->hop_limit;
1190         p->encap_limit = u->encap_limit;
1191         p->flowinfo = u->flowinfo;
1192         p->link = u->link;
1193         p->i_key = u->i_key;
1194         p->o_key = u->o_key;
1195         p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1196         p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1197         memcpy(p->name, u->name, sizeof(u->name));
1198 }
1199
1200 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1201         const struct __ip6_tnl_parm *p)
1202 {
1203         u->proto = IPPROTO_GRE;
1204         u->laddr = p->laddr;
1205         u->raddr = p->raddr;
1206         u->flags = p->flags;
1207         u->hop_limit = p->hop_limit;
1208         u->encap_limit = p->encap_limit;
1209         u->flowinfo = p->flowinfo;
1210         u->link = p->link;
1211         u->i_key = p->i_key;
1212         u->o_key = p->o_key;
1213         u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1214         u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1215         memcpy(u->name, p->name, sizeof(u->name));
1216 }
1217
1218 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1219         struct ifreq *ifr, int cmd)
1220 {
1221         int err = 0;
1222         struct ip6_tnl_parm2 p;
1223         struct __ip6_tnl_parm p1;
1224         struct ip6_tnl *t = netdev_priv(dev);
1225         struct net *net = t->net;
1226         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1227
1228         memset(&p1, 0, sizeof(p1));
1229
1230         switch (cmd) {
1231         case SIOCGETTUNNEL:
1232                 if (dev == ign->fb_tunnel_dev) {
1233                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1234                                 err = -EFAULT;
1235                                 break;
1236                         }
1237                         ip6gre_tnl_parm_from_user(&p1, &p);
1238                         t = ip6gre_tunnel_locate(net, &p1, 0);
1239                         if (!t)
1240                                 t = netdev_priv(dev);
1241                 }
1242                 memset(&p, 0, sizeof(p));
1243                 ip6gre_tnl_parm_to_user(&p, &t->parms);
1244                 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1245                         err = -EFAULT;
1246                 break;
1247
1248         case SIOCADDTUNNEL:
1249         case SIOCCHGTUNNEL:
1250                 err = -EPERM;
1251                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1252                         goto done;
1253
1254                 err = -EFAULT;
1255                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1256                         goto done;
1257
1258                 err = -EINVAL;
1259                 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1260                         goto done;
1261
1262                 if (!(p.i_flags&GRE_KEY))
1263                         p.i_key = 0;
1264                 if (!(p.o_flags&GRE_KEY))
1265                         p.o_key = 0;
1266
1267                 ip6gre_tnl_parm_from_user(&p1, &p);
1268                 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1269
1270                 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1271                         if (t) {
1272                                 if (t->dev != dev) {
1273                                         err = -EEXIST;
1274                                         break;
1275                                 }
1276                         } else {
1277                                 t = netdev_priv(dev);
1278
1279                                 ip6gre_tunnel_unlink(ign, t);
1280                                 synchronize_net();
1281                                 ip6gre_tnl_change(t, &p1, 1);
1282                                 ip6gre_tunnel_link(ign, t);
1283                                 netdev_state_change(dev);
1284                         }
1285                 }
1286
1287                 if (t) {
1288                         err = 0;
1289
1290                         memset(&p, 0, sizeof(p));
1291                         ip6gre_tnl_parm_to_user(&p, &t->parms);
1292                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1293                                 err = -EFAULT;
1294                 } else
1295                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1296                 break;
1297
1298         case SIOCDELTUNNEL:
1299                 err = -EPERM;
1300                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1301                         goto done;
1302
1303                 if (dev == ign->fb_tunnel_dev) {
1304                         err = -EFAULT;
1305                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1306                                 goto done;
1307                         err = -ENOENT;
1308                         ip6gre_tnl_parm_from_user(&p1, &p);
1309                         t = ip6gre_tunnel_locate(net, &p1, 0);
1310                         if (!t)
1311                                 goto done;
1312                         err = -EPERM;
1313                         if (t == netdev_priv(ign->fb_tunnel_dev))
1314                                 goto done;
1315                         dev = t->dev;
1316                 }
1317                 unregister_netdevice(dev);
1318                 err = 0;
1319                 break;
1320
1321         default:
1322                 err = -EINVAL;
1323         }
1324
1325 done:
1326         return err;
1327 }
1328
1329 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1330                          unsigned short type, const void *daddr,
1331                          const void *saddr, unsigned int len)
1332 {
1333         struct ip6_tnl *t = netdev_priv(dev);
1334         struct ipv6hdr *ipv6h;
1335         __be16 *p;
1336
1337         ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1338         ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1339                                                   t->fl.u.ip6.flowlabel,
1340                                                   true, &t->fl.u.ip6));
1341         ipv6h->hop_limit = t->parms.hop_limit;
1342         ipv6h->nexthdr = NEXTHDR_GRE;
1343         ipv6h->saddr = t->parms.laddr;
1344         ipv6h->daddr = t->parms.raddr;
1345
1346         p = (__be16 *)(ipv6h + 1);
1347         p[0] = t->parms.o_flags;
1348         p[1] = htons(type);
1349
1350         /*
1351          *      Set the source hardware address.
1352          */
1353
1354         if (saddr)
1355                 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1356         if (daddr)
1357                 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1358         if (!ipv6_addr_any(&ipv6h->daddr))
1359                 return t->hlen;
1360
1361         return -t->hlen;
1362 }
1363
1364 static const struct header_ops ip6gre_header_ops = {
1365         .create = ip6gre_header,
1366 };
1367
1368 static const struct net_device_ops ip6gre_netdev_ops = {
1369         .ndo_init               = ip6gre_tunnel_init,
1370         .ndo_uninit             = ip6gre_tunnel_uninit,
1371         .ndo_start_xmit         = ip6gre_tunnel_xmit,
1372         .ndo_do_ioctl           = ip6gre_tunnel_ioctl,
1373         .ndo_change_mtu         = ip6_tnl_change_mtu,
1374         .ndo_get_stats64        = ip_tunnel_get_stats64,
1375         .ndo_get_iflink         = ip6_tnl_get_iflink,
1376 };
1377
1378 static void ip6gre_dev_free(struct net_device *dev)
1379 {
1380         struct ip6_tnl *t = netdev_priv(dev);
1381
1382         gro_cells_destroy(&t->gro_cells);
1383         dst_cache_destroy(&t->dst_cache);
1384         free_percpu(dev->tstats);
1385 }
1386
1387 static void ip6gre_tunnel_setup(struct net_device *dev)
1388 {
1389         dev->netdev_ops = &ip6gre_netdev_ops;
1390         dev->needs_free_netdev = true;
1391         dev->priv_destructor = ip6gre_dev_free;
1392
1393         dev->type = ARPHRD_IP6GRE;
1394
1395         dev->flags |= IFF_NOARP;
1396         dev->addr_len = sizeof(struct in6_addr);
1397         netif_keep_dst(dev);
1398         /* This perm addr will be used as interface identifier by IPv6 */
1399         dev->addr_assign_type = NET_ADDR_RANDOM;
1400         eth_random_addr(dev->perm_addr);
1401 }
1402
1403 #define GRE6_FEATURES (NETIF_F_SG |             \
1404                        NETIF_F_FRAGLIST |       \
1405                        NETIF_F_HIGHDMA |        \
1406                        NETIF_F_HW_CSUM)
1407
1408 static void ip6gre_tnl_init_features(struct net_device *dev)
1409 {
1410         struct ip6_tnl *nt = netdev_priv(dev);
1411
1412         dev->features           |= GRE6_FEATURES;
1413         dev->hw_features        |= GRE6_FEATURES;
1414
1415         if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1416                 /* TCP offload with GRE SEQ is not supported, nor
1417                  * can we support 2 levels of outer headers requiring
1418                  * an update.
1419                  */
1420                 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1421                     nt->encap.type == TUNNEL_ENCAP_NONE) {
1422                         dev->features    |= NETIF_F_GSO_SOFTWARE;
1423                         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1424                 }
1425
1426                 /* Can use a lockless transmit, unless we generate
1427                  * output sequences
1428                  */
1429                 dev->features |= NETIF_F_LLTX;
1430         }
1431 }
1432
1433 static int ip6gre_tunnel_init_common(struct net_device *dev)
1434 {
1435         struct ip6_tnl *tunnel;
1436         int ret;
1437         int t_hlen;
1438
1439         tunnel = netdev_priv(dev);
1440
1441         tunnel->dev = dev;
1442         tunnel->net = dev_net(dev);
1443         strcpy(tunnel->parms.name, dev->name);
1444
1445         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1446         if (!dev->tstats)
1447                 return -ENOMEM;
1448
1449         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1450         if (ret)
1451                 goto cleanup_alloc_pcpu_stats;
1452
1453         ret = gro_cells_init(&tunnel->gro_cells, dev);
1454         if (ret)
1455                 goto cleanup_dst_cache_init;
1456
1457         t_hlen = ip6gre_calc_hlen(tunnel);
1458         dev->mtu = ETH_DATA_LEN - t_hlen;
1459         if (dev->type == ARPHRD_ETHER)
1460                 dev->mtu -= ETH_HLEN;
1461         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1462                 dev->mtu -= 8;
1463
1464         if (tunnel->parms.collect_md) {
1465                 dev->features |= NETIF_F_NETNS_LOCAL;
1466                 netif_keep_dst(dev);
1467         }
1468         ip6gre_tnl_init_features(dev);
1469
1470         return 0;
1471
1472 cleanup_dst_cache_init:
1473         dst_cache_destroy(&tunnel->dst_cache);
1474 cleanup_alloc_pcpu_stats:
1475         free_percpu(dev->tstats);
1476         dev->tstats = NULL;
1477         return ret;
1478 }
1479
1480 static int ip6gre_tunnel_init(struct net_device *dev)
1481 {
1482         struct ip6_tnl *tunnel;
1483         int ret;
1484
1485         ret = ip6gre_tunnel_init_common(dev);
1486         if (ret)
1487                 return ret;
1488
1489         tunnel = netdev_priv(dev);
1490
1491         if (tunnel->parms.collect_md)
1492                 return 0;
1493
1494         memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1495         memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1496
1497         if (ipv6_addr_any(&tunnel->parms.raddr))
1498                 dev->header_ops = &ip6gre_header_ops;
1499
1500         return 0;
1501 }
1502
1503 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1504 {
1505         struct ip6_tnl *tunnel = netdev_priv(dev);
1506
1507         tunnel->dev = dev;
1508         tunnel->net = dev_net(dev);
1509         strcpy(tunnel->parms.name, dev->name);
1510
1511         tunnel->hlen            = sizeof(struct ipv6hdr) + 4;
1512
1513         dev_hold(dev);
1514 }
1515
1516 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1517         .handler     = gre_rcv,
1518         .err_handler = ip6gre_err,
1519         .flags       = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1520 };
1521
1522 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1523 {
1524         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1525         struct net_device *dev, *aux;
1526         int prio;
1527
1528         for_each_netdev_safe(net, dev, aux)
1529                 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1530                     dev->rtnl_link_ops == &ip6gre_tap_ops ||
1531                     dev->rtnl_link_ops == &ip6erspan_tap_ops)
1532                         unregister_netdevice_queue(dev, head);
1533
1534         for (prio = 0; prio < 4; prio++) {
1535                 int h;
1536                 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1537                         struct ip6_tnl *t;
1538
1539                         t = rtnl_dereference(ign->tunnels[prio][h]);
1540
1541                         while (t) {
1542                                 /* If dev is in the same netns, it has already
1543                                  * been added to the list by the previous loop.
1544                                  */
1545                                 if (!net_eq(dev_net(t->dev), net))
1546                                         unregister_netdevice_queue(t->dev,
1547                                                                    head);
1548                                 t = rtnl_dereference(t->next);
1549                         }
1550                 }
1551         }
1552 }
1553
1554 static int __net_init ip6gre_init_net(struct net *net)
1555 {
1556         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1557         int err;
1558
1559         if (!net_has_fallback_tunnels(net))
1560                 return 0;
1561         ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1562                                           NET_NAME_UNKNOWN,
1563                                           ip6gre_tunnel_setup);
1564         if (!ign->fb_tunnel_dev) {
1565                 err = -ENOMEM;
1566                 goto err_alloc_dev;
1567         }
1568         dev_net_set(ign->fb_tunnel_dev, net);
1569         /* FB netdevice is special: we have one, and only one per netns.
1570          * Allowing to move it to another netns is clearly unsafe.
1571          */
1572         ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1573
1574
1575         ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1576         ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1577
1578         err = register_netdev(ign->fb_tunnel_dev);
1579         if (err)
1580                 goto err_reg_dev;
1581
1582         rcu_assign_pointer(ign->tunnels_wc[0],
1583                            netdev_priv(ign->fb_tunnel_dev));
1584         return 0;
1585
1586 err_reg_dev:
1587         free_netdev(ign->fb_tunnel_dev);
1588 err_alloc_dev:
1589         return err;
1590 }
1591
1592 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1593 {
1594         struct net *net;
1595         LIST_HEAD(list);
1596
1597         rtnl_lock();
1598         list_for_each_entry(net, net_list, exit_list)
1599                 ip6gre_destroy_tunnels(net, &list);
1600         unregister_netdevice_many(&list);
1601         rtnl_unlock();
1602 }
1603
1604 static struct pernet_operations ip6gre_net_ops = {
1605         .init = ip6gre_init_net,
1606         .exit_batch = ip6gre_exit_batch_net,
1607         .id   = &ip6gre_net_id,
1608         .size = sizeof(struct ip6gre_net),
1609 };
1610
1611 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1612                                   struct netlink_ext_ack *extack)
1613 {
1614         __be16 flags;
1615
1616         if (!data)
1617                 return 0;
1618
1619         flags = 0;
1620         if (data[IFLA_GRE_IFLAGS])
1621                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1622         if (data[IFLA_GRE_OFLAGS])
1623                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1624         if (flags & (GRE_VERSION|GRE_ROUTING))
1625                 return -EINVAL;
1626
1627         return 0;
1628 }
1629
1630 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1631                                struct netlink_ext_ack *extack)
1632 {
1633         struct in6_addr daddr;
1634
1635         if (tb[IFLA_ADDRESS]) {
1636                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1637                         return -EINVAL;
1638                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1639                         return -EADDRNOTAVAIL;
1640         }
1641
1642         if (!data)
1643                 goto out;
1644
1645         if (data[IFLA_GRE_REMOTE]) {
1646                 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1647                 if (ipv6_addr_any(&daddr))
1648                         return -EINVAL;
1649         }
1650
1651 out:
1652         return ip6gre_tunnel_validate(tb, data, extack);
1653 }
1654
1655 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1656                                   struct netlink_ext_ack *extack)
1657 {
1658         __be16 flags = 0;
1659         int ret, ver = 0;
1660
1661         if (!data)
1662                 return 0;
1663
1664         ret = ip6gre_tap_validate(tb, data, extack);
1665         if (ret)
1666                 return ret;
1667
1668         /* ERSPAN should only have GRE sequence and key flag */
1669         if (data[IFLA_GRE_OFLAGS])
1670                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1671         if (data[IFLA_GRE_IFLAGS])
1672                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1673         if (!data[IFLA_GRE_COLLECT_METADATA] &&
1674             flags != (GRE_SEQ | GRE_KEY))
1675                 return -EINVAL;
1676
1677         /* ERSPAN Session ID only has 10-bit. Since we reuse
1678          * 32-bit key field as ID, check it's range.
1679          */
1680         if (data[IFLA_GRE_IKEY] &&
1681             (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1682                 return -EINVAL;
1683
1684         if (data[IFLA_GRE_OKEY] &&
1685             (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1686                 return -EINVAL;
1687
1688         if (data[IFLA_GRE_ERSPAN_VER]) {
1689                 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1690                 if (ver != 1 && ver != 2)
1691                         return -EINVAL;
1692         }
1693
1694         if (ver == 1) {
1695                 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1696                         u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1697
1698                         if (index & ~INDEX_MASK)
1699                                 return -EINVAL;
1700                 }
1701         } else if (ver == 2) {
1702                 if (data[IFLA_GRE_ERSPAN_DIR]) {
1703                         u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1704
1705                         if (dir & ~(DIR_MASK >> DIR_OFFSET))
1706                                 return -EINVAL;
1707                 }
1708
1709                 if (data[IFLA_GRE_ERSPAN_HWID]) {
1710                         u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1711
1712                         if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1713                                 return -EINVAL;
1714                 }
1715         }
1716
1717         return 0;
1718 }
1719
1720 static void ip6gre_netlink_parms(struct nlattr *data[],
1721                                 struct __ip6_tnl_parm *parms)
1722 {
1723         memset(parms, 0, sizeof(*parms));
1724
1725         if (!data)
1726                 return;
1727
1728         if (data[IFLA_GRE_LINK])
1729                 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1730
1731         if (data[IFLA_GRE_IFLAGS])
1732                 parms->i_flags = gre_flags_to_tnl_flags(
1733                                 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1734
1735         if (data[IFLA_GRE_OFLAGS])
1736                 parms->o_flags = gre_flags_to_tnl_flags(
1737                                 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1738
1739         if (data[IFLA_GRE_IKEY])
1740                 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1741
1742         if (data[IFLA_GRE_OKEY])
1743                 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1744
1745         if (data[IFLA_GRE_LOCAL])
1746                 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1747
1748         if (data[IFLA_GRE_REMOTE])
1749                 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1750
1751         if (data[IFLA_GRE_TTL])
1752                 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1753
1754         if (data[IFLA_GRE_ENCAP_LIMIT])
1755                 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1756
1757         if (data[IFLA_GRE_FLOWINFO])
1758                 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1759
1760         if (data[IFLA_GRE_FLAGS])
1761                 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1762
1763         if (data[IFLA_GRE_FWMARK])
1764                 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1765
1766         if (data[IFLA_GRE_COLLECT_METADATA])
1767                 parms->collect_md = true;
1768
1769         parms->erspan_ver = 1;
1770         if (data[IFLA_GRE_ERSPAN_VER])
1771                 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1772
1773         if (parms->erspan_ver == 1) {
1774                 if (data[IFLA_GRE_ERSPAN_INDEX])
1775                         parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1776         } else if (parms->erspan_ver == 2) {
1777                 if (data[IFLA_GRE_ERSPAN_DIR])
1778                         parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1779                 if (data[IFLA_GRE_ERSPAN_HWID])
1780                         parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1781         }
1782 }
1783
1784 static int ip6gre_tap_init(struct net_device *dev)
1785 {
1786         int ret;
1787
1788         ret = ip6gre_tunnel_init_common(dev);
1789         if (ret)
1790                 return ret;
1791
1792         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1793
1794         return 0;
1795 }
1796
1797 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1798         .ndo_init = ip6gre_tap_init,
1799         .ndo_uninit = ip6gre_tunnel_uninit,
1800         .ndo_start_xmit = ip6gre_tunnel_xmit,
1801         .ndo_set_mac_address = eth_mac_addr,
1802         .ndo_validate_addr = eth_validate_addr,
1803         .ndo_change_mtu = ip6_tnl_change_mtu,
1804         .ndo_get_stats64 = ip_tunnel_get_stats64,
1805         .ndo_get_iflink = ip6_tnl_get_iflink,
1806 };
1807
1808 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1809 {
1810         int t_hlen;
1811
1812         tunnel->tun_hlen = 8;
1813         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1814                        erspan_hdr_len(tunnel->parms.erspan_ver);
1815
1816         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1817         tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1818         return t_hlen;
1819 }
1820
1821 static int ip6erspan_tap_init(struct net_device *dev)
1822 {
1823         struct ip6_tnl *tunnel;
1824         int t_hlen;
1825         int ret;
1826
1827         tunnel = netdev_priv(dev);
1828
1829         tunnel->dev = dev;
1830         tunnel->net = dev_net(dev);
1831         strcpy(tunnel->parms.name, dev->name);
1832
1833         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1834         if (!dev->tstats)
1835                 return -ENOMEM;
1836
1837         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1838         if (ret)
1839                 goto cleanup_alloc_pcpu_stats;
1840
1841         ret = gro_cells_init(&tunnel->gro_cells, dev);
1842         if (ret)
1843                 goto cleanup_dst_cache_init;
1844
1845         t_hlen = ip6erspan_calc_hlen(tunnel);
1846         dev->mtu = ETH_DATA_LEN - t_hlen;
1847         if (dev->type == ARPHRD_ETHER)
1848                 dev->mtu -= ETH_HLEN;
1849         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1850                 dev->mtu -= 8;
1851
1852         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1853         ip6erspan_tnl_link_config(tunnel, 1);
1854
1855         return 0;
1856
1857 cleanup_dst_cache_init:
1858         dst_cache_destroy(&tunnel->dst_cache);
1859 cleanup_alloc_pcpu_stats:
1860         free_percpu(dev->tstats);
1861         dev->tstats = NULL;
1862         return ret;
1863 }
1864
1865 static const struct net_device_ops ip6erspan_netdev_ops = {
1866         .ndo_init =             ip6erspan_tap_init,
1867         .ndo_uninit =           ip6erspan_tunnel_uninit,
1868         .ndo_start_xmit =       ip6erspan_tunnel_xmit,
1869         .ndo_set_mac_address =  eth_mac_addr,
1870         .ndo_validate_addr =    eth_validate_addr,
1871         .ndo_change_mtu =       ip6_tnl_change_mtu,
1872         .ndo_get_stats64 =      ip_tunnel_get_stats64,
1873         .ndo_get_iflink =       ip6_tnl_get_iflink,
1874 };
1875
1876 static void ip6gre_tap_setup(struct net_device *dev)
1877 {
1878
1879         ether_setup(dev);
1880
1881         dev->max_mtu = 0;
1882         dev->netdev_ops = &ip6gre_tap_netdev_ops;
1883         dev->needs_free_netdev = true;
1884         dev->priv_destructor = ip6gre_dev_free;
1885
1886         dev->features |= NETIF_F_NETNS_LOCAL;
1887         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1888         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1889         netif_keep_dst(dev);
1890 }
1891
1892 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1893                                        struct ip_tunnel_encap *ipencap)
1894 {
1895         bool ret = false;
1896
1897         memset(ipencap, 0, sizeof(*ipencap));
1898
1899         if (!data)
1900                 return ret;
1901
1902         if (data[IFLA_GRE_ENCAP_TYPE]) {
1903                 ret = true;
1904                 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1905         }
1906
1907         if (data[IFLA_GRE_ENCAP_FLAGS]) {
1908                 ret = true;
1909                 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1910         }
1911
1912         if (data[IFLA_GRE_ENCAP_SPORT]) {
1913                 ret = true;
1914                 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1915         }
1916
1917         if (data[IFLA_GRE_ENCAP_DPORT]) {
1918                 ret = true;
1919                 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1920         }
1921
1922         return ret;
1923 }
1924
1925 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1926                                  struct nlattr *tb[], struct nlattr *data[],
1927                                  struct netlink_ext_ack *extack)
1928 {
1929         struct ip6_tnl *nt;
1930         struct ip_tunnel_encap ipencap;
1931         int err;
1932
1933         nt = netdev_priv(dev);
1934
1935         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1936                 int err = ip6_tnl_encap_setup(nt, &ipencap);
1937
1938                 if (err < 0)
1939                         return err;
1940         }
1941
1942         if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1943                 eth_hw_addr_random(dev);
1944
1945         nt->dev = dev;
1946         nt->net = dev_net(dev);
1947
1948         err = register_netdevice(dev);
1949         if (err)
1950                 goto out;
1951
1952         if (tb[IFLA_MTU])
1953                 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1954
1955         dev_hold(dev);
1956
1957 out:
1958         return err;
1959 }
1960
1961 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1962                           struct nlattr *tb[], struct nlattr *data[],
1963                           struct netlink_ext_ack *extack)
1964 {
1965         struct ip6_tnl *nt = netdev_priv(dev);
1966         struct net *net = dev_net(dev);
1967         struct ip6gre_net *ign;
1968         int err;
1969
1970         ip6gre_netlink_parms(data, &nt->parms);
1971         ign = net_generic(net, ip6gre_net_id);
1972
1973         if (nt->parms.collect_md) {
1974                 if (rtnl_dereference(ign->collect_md_tun))
1975                         return -EEXIST;
1976         } else {
1977                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1978                         return -EEXIST;
1979         }
1980
1981         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
1982         if (!err) {
1983                 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1984                 ip6gre_tunnel_link_md(ign, nt);
1985                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
1986         }
1987         return err;
1988 }
1989
1990 static struct ip6_tnl *
1991 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
1992                          struct nlattr *data[], struct __ip6_tnl_parm *p_p,
1993                          struct netlink_ext_ack *extack)
1994 {
1995         struct ip6_tnl *t, *nt = netdev_priv(dev);
1996         struct net *net = nt->net;
1997         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1998         struct ip_tunnel_encap ipencap;
1999
2000         if (dev == ign->fb_tunnel_dev)
2001                 return ERR_PTR(-EINVAL);
2002
2003         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2004                 int err = ip6_tnl_encap_setup(nt, &ipencap);
2005
2006                 if (err < 0)
2007                         return ERR_PTR(err);
2008         }
2009
2010         ip6gre_netlink_parms(data, p_p);
2011
2012         t = ip6gre_tunnel_locate(net, p_p, 0);
2013
2014         if (t) {
2015                 if (t->dev != dev)
2016                         return ERR_PTR(-EEXIST);
2017         } else {
2018                 t = nt;
2019         }
2020
2021         return t;
2022 }
2023
2024 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2025                              struct nlattr *data[],
2026                              struct netlink_ext_ack *extack)
2027 {
2028         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2029         struct __ip6_tnl_parm p;
2030         struct ip6_tnl *t;
2031
2032         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2033         if (IS_ERR(t))
2034                 return PTR_ERR(t);
2035
2036         ip6gre_tunnel_unlink_md(ign, t);
2037         ip6gre_tunnel_unlink(ign, t);
2038         ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2039         ip6gre_tunnel_link_md(ign, t);
2040         ip6gre_tunnel_link(ign, t);
2041         return 0;
2042 }
2043
2044 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2045 {
2046         struct net *net = dev_net(dev);
2047         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2048
2049         if (dev != ign->fb_tunnel_dev)
2050                 unregister_netdevice_queue(dev, head);
2051 }
2052
2053 static size_t ip6gre_get_size(const struct net_device *dev)
2054 {
2055         return
2056                 /* IFLA_GRE_LINK */
2057                 nla_total_size(4) +
2058                 /* IFLA_GRE_IFLAGS */
2059                 nla_total_size(2) +
2060                 /* IFLA_GRE_OFLAGS */
2061                 nla_total_size(2) +
2062                 /* IFLA_GRE_IKEY */
2063                 nla_total_size(4) +
2064                 /* IFLA_GRE_OKEY */
2065                 nla_total_size(4) +
2066                 /* IFLA_GRE_LOCAL */
2067                 nla_total_size(sizeof(struct in6_addr)) +
2068                 /* IFLA_GRE_REMOTE */
2069                 nla_total_size(sizeof(struct in6_addr)) +
2070                 /* IFLA_GRE_TTL */
2071                 nla_total_size(1) +
2072                 /* IFLA_GRE_ENCAP_LIMIT */
2073                 nla_total_size(1) +
2074                 /* IFLA_GRE_FLOWINFO */
2075                 nla_total_size(4) +
2076                 /* IFLA_GRE_FLAGS */
2077                 nla_total_size(4) +
2078                 /* IFLA_GRE_ENCAP_TYPE */
2079                 nla_total_size(2) +
2080                 /* IFLA_GRE_ENCAP_FLAGS */
2081                 nla_total_size(2) +
2082                 /* IFLA_GRE_ENCAP_SPORT */
2083                 nla_total_size(2) +
2084                 /* IFLA_GRE_ENCAP_DPORT */
2085                 nla_total_size(2) +
2086                 /* IFLA_GRE_COLLECT_METADATA */
2087                 nla_total_size(0) +
2088                 /* IFLA_GRE_FWMARK */
2089                 nla_total_size(4) +
2090                 /* IFLA_GRE_ERSPAN_INDEX */
2091                 nla_total_size(4) +
2092                 0;
2093 }
2094
2095 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2096 {
2097         struct ip6_tnl *t = netdev_priv(dev);
2098         struct __ip6_tnl_parm *p = &t->parms;
2099
2100         if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2101             nla_put_be16(skb, IFLA_GRE_IFLAGS,
2102                          gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2103             nla_put_be16(skb, IFLA_GRE_OFLAGS,
2104                          gre_tnl_flags_to_gre_flags(p->o_flags)) ||
2105             nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2106             nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2107             nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2108             nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2109             nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2110             nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2111             nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2112             nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2113             nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
2114             nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2115                 goto nla_put_failure;
2116
2117         if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2118                         t->encap.type) ||
2119             nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2120                          t->encap.sport) ||
2121             nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2122                          t->encap.dport) ||
2123             nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2124                         t->encap.flags))
2125                 goto nla_put_failure;
2126
2127         if (p->collect_md) {
2128                 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2129                         goto nla_put_failure;
2130         }
2131
2132         if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2133                 goto nla_put_failure;
2134
2135         if (p->erspan_ver == 1) {
2136                 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2137                         goto nla_put_failure;
2138         } else if (p->erspan_ver == 2) {
2139                 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2140                         goto nla_put_failure;
2141                 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2142                         goto nla_put_failure;
2143         }
2144
2145         return 0;
2146
2147 nla_put_failure:
2148         return -EMSGSIZE;
2149 }
2150
2151 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2152         [IFLA_GRE_LINK]        = { .type = NLA_U32 },
2153         [IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2154         [IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2155         [IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2156         [IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2157         [IFLA_GRE_LOCAL]       = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2158         [IFLA_GRE_REMOTE]      = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2159         [IFLA_GRE_TTL]         = { .type = NLA_U8 },
2160         [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2161         [IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2162         [IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2163         [IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2164         [IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2165         [IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2166         [IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2167         [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2168         [IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2169         [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2170         [IFLA_GRE_ERSPAN_VER]   = { .type = NLA_U8 },
2171         [IFLA_GRE_ERSPAN_DIR]   = { .type = NLA_U8 },
2172         [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
2173 };
2174
2175 static void ip6erspan_tap_setup(struct net_device *dev)
2176 {
2177         ether_setup(dev);
2178
2179         dev->netdev_ops = &ip6erspan_netdev_ops;
2180         dev->needs_free_netdev = true;
2181         dev->priv_destructor = ip6gre_dev_free;
2182
2183         dev->features |= NETIF_F_NETNS_LOCAL;
2184         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2185         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2186         netif_keep_dst(dev);
2187 }
2188
2189 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2190                              struct nlattr *tb[], struct nlattr *data[],
2191                              struct netlink_ext_ack *extack)
2192 {
2193         struct ip6_tnl *nt = netdev_priv(dev);
2194         struct net *net = dev_net(dev);
2195         struct ip6gre_net *ign;
2196         int err;
2197
2198         ip6gre_netlink_parms(data, &nt->parms);
2199         ign = net_generic(net, ip6gre_net_id);
2200
2201         if (nt->parms.collect_md) {
2202                 if (rtnl_dereference(ign->collect_md_tun_erspan))
2203                         return -EEXIST;
2204         } else {
2205                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2206                         return -EEXIST;
2207         }
2208
2209         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2210         if (!err) {
2211                 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2212                 ip6erspan_tunnel_link_md(ign, nt);
2213                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2214         }
2215         return err;
2216 }
2217
2218 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2219 {
2220         ip6gre_tnl_link_config_common(t);
2221         ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2222 }
2223
2224 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2225                                 const struct __ip6_tnl_parm *p, int set_mtu)
2226 {
2227         ip6gre_tnl_copy_tnl_parm(t, p);
2228         ip6erspan_tnl_link_config(t, set_mtu);
2229         return 0;
2230 }
2231
2232 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2233                                 struct nlattr *data[],
2234                                 struct netlink_ext_ack *extack)
2235 {
2236         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2237         struct __ip6_tnl_parm p;
2238         struct ip6_tnl *t;
2239
2240         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2241         if (IS_ERR(t))
2242                 return PTR_ERR(t);
2243
2244         ip6gre_tunnel_unlink_md(ign, t);
2245         ip6gre_tunnel_unlink(ign, t);
2246         ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2247         ip6erspan_tunnel_link_md(ign, t);
2248         ip6gre_tunnel_link(ign, t);
2249         return 0;
2250 }
2251
2252 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2253         .kind           = "ip6gre",
2254         .maxtype        = IFLA_GRE_MAX,
2255         .policy         = ip6gre_policy,
2256         .priv_size      = sizeof(struct ip6_tnl),
2257         .setup          = ip6gre_tunnel_setup,
2258         .validate       = ip6gre_tunnel_validate,
2259         .newlink        = ip6gre_newlink,
2260         .changelink     = ip6gre_changelink,
2261         .dellink        = ip6gre_dellink,
2262         .get_size       = ip6gre_get_size,
2263         .fill_info      = ip6gre_fill_info,
2264         .get_link_net   = ip6_tnl_get_link_net,
2265 };
2266
2267 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2268         .kind           = "ip6gretap",
2269         .maxtype        = IFLA_GRE_MAX,
2270         .policy         = ip6gre_policy,
2271         .priv_size      = sizeof(struct ip6_tnl),
2272         .setup          = ip6gre_tap_setup,
2273         .validate       = ip6gre_tap_validate,
2274         .newlink        = ip6gre_newlink,
2275         .changelink     = ip6gre_changelink,
2276         .get_size       = ip6gre_get_size,
2277         .fill_info      = ip6gre_fill_info,
2278         .get_link_net   = ip6_tnl_get_link_net,
2279 };
2280
2281 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2282         .kind           = "ip6erspan",
2283         .maxtype        = IFLA_GRE_MAX,
2284         .policy         = ip6gre_policy,
2285         .priv_size      = sizeof(struct ip6_tnl),
2286         .setup          = ip6erspan_tap_setup,
2287         .validate       = ip6erspan_tap_validate,
2288         .newlink        = ip6erspan_newlink,
2289         .changelink     = ip6erspan_changelink,
2290         .get_size       = ip6gre_get_size,
2291         .fill_info      = ip6gre_fill_info,
2292         .get_link_net   = ip6_tnl_get_link_net,
2293 };
2294
2295 /*
2296  *      And now the modules code and kernel interface.
2297  */
2298
2299 static int __init ip6gre_init(void)
2300 {
2301         int err;
2302
2303         pr_info("GRE over IPv6 tunneling driver\n");
2304
2305         err = register_pernet_device(&ip6gre_net_ops);
2306         if (err < 0)
2307                 return err;
2308
2309         err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2310         if (err < 0) {
2311                 pr_info("%s: can't add protocol\n", __func__);
2312                 goto add_proto_failed;
2313         }
2314
2315         err = rtnl_link_register(&ip6gre_link_ops);
2316         if (err < 0)
2317                 goto rtnl_link_failed;
2318
2319         err = rtnl_link_register(&ip6gre_tap_ops);
2320         if (err < 0)
2321                 goto tap_ops_failed;
2322
2323         err = rtnl_link_register(&ip6erspan_tap_ops);
2324         if (err < 0)
2325                 goto erspan_link_failed;
2326
2327 out:
2328         return err;
2329
2330 erspan_link_failed:
2331         rtnl_link_unregister(&ip6gre_tap_ops);
2332 tap_ops_failed:
2333         rtnl_link_unregister(&ip6gre_link_ops);
2334 rtnl_link_failed:
2335         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2336 add_proto_failed:
2337         unregister_pernet_device(&ip6gre_net_ops);
2338         goto out;
2339 }
2340
2341 static void __exit ip6gre_fini(void)
2342 {
2343         rtnl_link_unregister(&ip6gre_tap_ops);
2344         rtnl_link_unregister(&ip6gre_link_ops);
2345         rtnl_link_unregister(&ip6erspan_tap_ops);
2346         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2347         unregister_pernet_device(&ip6gre_net_ops);
2348 }
2349
2350 module_init(ip6gre_init);
2351 module_exit(ip6gre_fini);
2352 MODULE_LICENSE("GPL");
2353 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2354 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2355 MODULE_ALIAS_RTNL_LINK("ip6gre");
2356 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2357 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2358 MODULE_ALIAS_NETDEV("ip6gre0");