net/ipv6/ip6_gre.c

   1 /*
   2  *      GRE over IPv6 protocol decoder.
   3  *
   4  *      Authors: Dmitry Kozlov ([email protected])
   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         t->parms.erspan_ver = p->erspan_ver;
1173         t->parms.index = p->index;
1174         t->parms.dir = p->dir;
1175         t->parms.hwid = p->hwid;
1176         dst_cache_reset(&t->dst_cache);
1177 }
1178
1179 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1180                              int set_mtu)
1181 {
1182         ip6gre_tnl_copy_tnl_parm(t, p);
1183         ip6gre_tnl_link_config(t, set_mtu);
1184         return 0;
1185 }
1186
1187 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1188         const struct ip6_tnl_parm2 *u)
1189 {
1190         p->laddr = u->laddr;
1191         p->raddr = u->raddr;
1192         p->flags = u->flags;
1193         p->hop_limit = u->hop_limit;
1194         p->encap_limit = u->encap_limit;
1195         p->flowinfo = u->flowinfo;
1196         p->link = u->link;
1197         p->i_key = u->i_key;
1198         p->o_key = u->o_key;
1199         p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1200         p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1201         memcpy(p->name, u->name, sizeof(u->name));
1202 }
1203
1204 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1205         const struct __ip6_tnl_parm *p)
1206 {
1207         u->proto = IPPROTO_GRE;
1208         u->laddr = p->laddr;
1209         u->raddr = p->raddr;
1210         u->flags = p->flags;
1211         u->hop_limit = p->hop_limit;
1212         u->encap_limit = p->encap_limit;
1213         u->flowinfo = p->flowinfo;
1214         u->link = p->link;
1215         u->i_key = p->i_key;
1216         u->o_key = p->o_key;
1217         u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1218         u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1219         memcpy(u->name, p->name, sizeof(u->name));
1220 }
1221
1222 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1223         struct ifreq *ifr, int cmd)
1224 {
1225         int err = 0;
1226         struct ip6_tnl_parm2 p;
1227         struct __ip6_tnl_parm p1;
1228         struct ip6_tnl *t = netdev_priv(dev);
1229         struct net *net = t->net;
1230         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1231
1232         memset(&p1, 0, sizeof(p1));
1233
1234         switch (cmd) {
1235         case SIOCGETTUNNEL:
1236                 if (dev == ign->fb_tunnel_dev) {
1237                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1238                                 err = -EFAULT;
1239                                 break;
1240                         }
1241                         ip6gre_tnl_parm_from_user(&p1, &p);
1242                         t = ip6gre_tunnel_locate(net, &p1, 0);
1243                         if (!t)
1244                                 t = netdev_priv(dev);
1245                 }
1246                 memset(&p, 0, sizeof(p));
1247                 ip6gre_tnl_parm_to_user(&p, &t->parms);
1248                 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1249                         err = -EFAULT;
1250                 break;
1251
1252         case SIOCADDTUNNEL:
1253         case SIOCCHGTUNNEL:
1254                 err = -EPERM;
1255                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1256                         goto done;
1257
1258                 err = -EFAULT;
1259                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1260                         goto done;
1261
1262                 err = -EINVAL;
1263                 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1264                         goto done;
1265
1266                 if (!(p.i_flags&GRE_KEY))
1267                         p.i_key = 0;
1268                 if (!(p.o_flags&GRE_KEY))
1269                         p.o_key = 0;
1270
1271                 ip6gre_tnl_parm_from_user(&p1, &p);
1272                 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1273
1274                 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1275                         if (t) {
1276                                 if (t->dev != dev) {
1277                                         err = -EEXIST;
1278                                         break;
1279                                 }
1280                         } else {
1281                                 t = netdev_priv(dev);
1282
1283                                 ip6gre_tunnel_unlink(ign, t);
1284                                 synchronize_net();
1285                                 ip6gre_tnl_change(t, &p1, 1);
1286                                 ip6gre_tunnel_link(ign, t);
1287                                 netdev_state_change(dev);
1288                         }
1289                 }
1290
1291                 if (t) {
1292                         err = 0;
1293
1294                         memset(&p, 0, sizeof(p));
1295                         ip6gre_tnl_parm_to_user(&p, &t->parms);
1296                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1297                                 err = -EFAULT;
1298                 } else
1299                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1300                 break;
1301
1302         case SIOCDELTUNNEL:
1303                 err = -EPERM;
1304                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1305                         goto done;
1306
1307                 if (dev == ign->fb_tunnel_dev) {
1308                         err = -EFAULT;
1309                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1310                                 goto done;
1311                         err = -ENOENT;
1312                         ip6gre_tnl_parm_from_user(&p1, &p);
1313                         t = ip6gre_tunnel_locate(net, &p1, 0);
1314                         if (!t)
1315                                 goto done;
1316                         err = -EPERM;
1317                         if (t == netdev_priv(ign->fb_tunnel_dev))
1318                                 goto done;
1319                         dev = t->dev;
1320                 }
1321                 unregister_netdevice(dev);
1322                 err = 0;
1323                 break;
1324
1325         default:
1326                 err = -EINVAL;
1327         }
1328
1329 done:
1330         return err;
1331 }
1332
1333 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1334                          unsigned short type, const void *daddr,
1335                          const void *saddr, unsigned int len)
1336 {
1337         struct ip6_tnl *t = netdev_priv(dev);
1338         struct ipv6hdr *ipv6h;
1339         __be16 *p;
1340
1341         ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1342         ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1343                                                   t->fl.u.ip6.flowlabel,
1344                                                   true, &t->fl.u.ip6));
1345         ipv6h->hop_limit = t->parms.hop_limit;
1346         ipv6h->nexthdr = NEXTHDR_GRE;
1347         ipv6h->saddr = t->parms.laddr;
1348         ipv6h->daddr = t->parms.raddr;
1349
1350         p = (__be16 *)(ipv6h + 1);
1351         p[0] = t->parms.o_flags;
1352         p[1] = htons(type);
1353
1354         /*
1355          *      Set the source hardware address.
1356          */
1357
1358         if (saddr)
1359                 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1360         if (daddr)
1361                 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1362         if (!ipv6_addr_any(&ipv6h->daddr))
1363                 return t->hlen;
1364
1365         return -t->hlen;
1366 }
1367
1368 static const struct header_ops ip6gre_header_ops = {
1369         .create = ip6gre_header,
1370 };
1371
1372 static const struct net_device_ops ip6gre_netdev_ops = {
1373         .ndo_init               = ip6gre_tunnel_init,
1374         .ndo_uninit             = ip6gre_tunnel_uninit,
1375         .ndo_start_xmit         = ip6gre_tunnel_xmit,
1376         .ndo_do_ioctl           = ip6gre_tunnel_ioctl,
1377         .ndo_change_mtu         = ip6_tnl_change_mtu,
1378         .ndo_get_stats64        = ip_tunnel_get_stats64,
1379         .ndo_get_iflink         = ip6_tnl_get_iflink,
1380 };
1381
1382 static void ip6gre_dev_free(struct net_device *dev)
1383 {
1384         struct ip6_tnl *t = netdev_priv(dev);
1385
1386         gro_cells_destroy(&t->gro_cells);
1387         dst_cache_destroy(&t->dst_cache);
1388         free_percpu(dev->tstats);
1389 }
1390
1391 static void ip6gre_tunnel_setup(struct net_device *dev)
1392 {
1393         dev->netdev_ops = &ip6gre_netdev_ops;
1394         dev->needs_free_netdev = true;
1395         dev->priv_destructor = ip6gre_dev_free;
1396
1397         dev->type = ARPHRD_IP6GRE;
1398
1399         dev->flags |= IFF_NOARP;
1400         dev->addr_len = sizeof(struct in6_addr);
1401         netif_keep_dst(dev);
1402         /* This perm addr will be used as interface identifier by IPv6 */
1403         dev->addr_assign_type = NET_ADDR_RANDOM;
1404         eth_random_addr(dev->perm_addr);
1405 }
1406
1407 #define GRE6_FEATURES (NETIF_F_SG |             \
1408                        NETIF_F_FRAGLIST |       \
1409                        NETIF_F_HIGHDMA |        \
1410                        NETIF_F_HW_CSUM)
1411
1412 static void ip6gre_tnl_init_features(struct net_device *dev)
1413 {
1414         struct ip6_tnl *nt = netdev_priv(dev);
1415
1416         dev->features           |= GRE6_FEATURES;
1417         dev->hw_features        |= GRE6_FEATURES;
1418
1419         if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1420                 /* TCP offload with GRE SEQ is not supported, nor
1421                  * can we support 2 levels of outer headers requiring
1422                  * an update.
1423                  */
1424                 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1425                     nt->encap.type == TUNNEL_ENCAP_NONE) {
1426                         dev->features    |= NETIF_F_GSO_SOFTWARE;
1427                         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1428                 }
1429
1430                 /* Can use a lockless transmit, unless we generate
1431                  * output sequences
1432                  */
1433                 dev->features |= NETIF_F_LLTX;
1434         }
1435 }
1436
1437 static int ip6gre_tunnel_init_common(struct net_device *dev)
1438 {
1439         struct ip6_tnl *tunnel;
1440         int ret;
1441         int t_hlen;
1442
1443         tunnel = netdev_priv(dev);
1444
1445         tunnel->dev = dev;
1446         tunnel->net = dev_net(dev);
1447         strcpy(tunnel->parms.name, dev->name);
1448
1449         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1450         if (!dev->tstats)
1451                 return -ENOMEM;
1452
1453         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1454         if (ret)
1455                 goto cleanup_alloc_pcpu_stats;
1456
1457         ret = gro_cells_init(&tunnel->gro_cells, dev);
1458         if (ret)
1459                 goto cleanup_dst_cache_init;
1460
1461         t_hlen = ip6gre_calc_hlen(tunnel);
1462         dev->mtu = ETH_DATA_LEN - t_hlen;
1463         if (dev->type == ARPHRD_ETHER)
1464                 dev->mtu -= ETH_HLEN;
1465         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1466                 dev->mtu -= 8;
1467
1468         if (tunnel->parms.collect_md) {
1469                 dev->features |= NETIF_F_NETNS_LOCAL;
1470                 netif_keep_dst(dev);
1471         }
1472         ip6gre_tnl_init_features(dev);
1473
1474         return 0;
1475
1476 cleanup_dst_cache_init:
1477         dst_cache_destroy(&tunnel->dst_cache);
1478 cleanup_alloc_pcpu_stats:
1479         free_percpu(dev->tstats);
1480         dev->tstats = NULL;
1481         return ret;
1482 }
1483
1484 static int ip6gre_tunnel_init(struct net_device *dev)
1485 {
1486         struct ip6_tnl *tunnel;
1487         int ret;
1488
1489         ret = ip6gre_tunnel_init_common(dev);
1490         if (ret)
1491                 return ret;
1492
1493         tunnel = netdev_priv(dev);
1494
1495         if (tunnel->parms.collect_md)
1496                 return 0;
1497
1498         memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1499         memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1500
1501         if (ipv6_addr_any(&tunnel->parms.raddr))
1502                 dev->header_ops = &ip6gre_header_ops;
1503
1504         return 0;
1505 }
1506
1507 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1508 {
1509         struct ip6_tnl *tunnel = netdev_priv(dev);
1510
1511         tunnel->dev = dev;
1512         tunnel->net = dev_net(dev);
1513         strcpy(tunnel->parms.name, dev->name);
1514
1515         tunnel->hlen            = sizeof(struct ipv6hdr) + 4;
1516
1517         dev_hold(dev);
1518 }
1519
1520 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1521         .handler     = gre_rcv,
1522         .err_handler = ip6gre_err,
1523         .flags       = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1524 };
1525
1526 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1527 {
1528         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1529         struct net_device *dev, *aux;
1530         int prio;
1531
1532         for_each_netdev_safe(net, dev, aux)
1533                 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1534                     dev->rtnl_link_ops == &ip6gre_tap_ops ||
1535                     dev->rtnl_link_ops == &ip6erspan_tap_ops)
1536                         unregister_netdevice_queue(dev, head);
1537
1538         for (prio = 0; prio < 4; prio++) {
1539                 int h;
1540                 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1541                         struct ip6_tnl *t;
1542
1543                         t = rtnl_dereference(ign->tunnels[prio][h]);
1544
1545                         while (t) {
1546                                 /* If dev is in the same netns, it has already
1547                                  * been added to the list by the previous loop.
1548                                  */
1549                                 if (!net_eq(dev_net(t->dev), net))
1550                                         unregister_netdevice_queue(t->dev,
1551                                                                    head);
1552                                 t = rtnl_dereference(t->next);
1553                         }
1554                 }
1555         }
1556 }
1557
1558 static int __net_init ip6gre_init_net(struct net *net)
1559 {
1560         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1561         int err;
1562
1563         if (!net_has_fallback_tunnels(net))
1564                 return 0;
1565         ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1566                                           NET_NAME_UNKNOWN,
1567                                           ip6gre_tunnel_setup);
1568         if (!ign->fb_tunnel_dev) {
1569                 err = -ENOMEM;
1570                 goto err_alloc_dev;
1571         }
1572         dev_net_set(ign->fb_tunnel_dev, net);
1573         /* FB netdevice is special: we have one, and only one per netns.
1574          * Allowing to move it to another netns is clearly unsafe.
1575          */
1576         ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1577
1578
1579         ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1580         ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1581
1582         err = register_netdev(ign->fb_tunnel_dev);
1583         if (err)
1584                 goto err_reg_dev;
1585
1586         rcu_assign_pointer(ign->tunnels_wc[0],
1587                            netdev_priv(ign->fb_tunnel_dev));
1588         return 0;
1589
1590 err_reg_dev:
1591         free_netdev(ign->fb_tunnel_dev);
1592 err_alloc_dev:
1593         return err;
1594 }
1595
1596 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1597 {
1598         struct net *net;
1599         LIST_HEAD(list);
1600
1601         rtnl_lock();
1602         list_for_each_entry(net, net_list, exit_list)
1603                 ip6gre_destroy_tunnels(net, &list);
1604         unregister_netdevice_many(&list);
1605         rtnl_unlock();
1606 }
1607
1608 static struct pernet_operations ip6gre_net_ops = {
1609         .init = ip6gre_init_net,
1610         .exit_batch = ip6gre_exit_batch_net,
1611         .id   = &ip6gre_net_id,
1612         .size = sizeof(struct ip6gre_net),
1613 };
1614
1615 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1616                                   struct netlink_ext_ack *extack)
1617 {
1618         __be16 flags;
1619
1620         if (!data)
1621                 return 0;
1622
1623         flags = 0;
1624         if (data[IFLA_GRE_IFLAGS])
1625                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1626         if (data[IFLA_GRE_OFLAGS])
1627                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1628         if (flags & (GRE_VERSION|GRE_ROUTING))
1629                 return -EINVAL;
1630
1631         return 0;
1632 }
1633
1634 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1635                                struct netlink_ext_ack *extack)
1636 {
1637         struct in6_addr daddr;
1638
1639         if (tb[IFLA_ADDRESS]) {
1640                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1641                         return -EINVAL;
1642                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1643                         return -EADDRNOTAVAIL;
1644         }
1645
1646         if (!data)
1647                 goto out;
1648
1649         if (data[IFLA_GRE_REMOTE]) {
1650                 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1651                 if (ipv6_addr_any(&daddr))
1652                         return -EINVAL;
1653         }
1654
1655 out:
1656         return ip6gre_tunnel_validate(tb, data, extack);
1657 }
1658
1659 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1660                                   struct netlink_ext_ack *extack)
1661 {
1662         __be16 flags = 0;
1663         int ret, ver = 0;
1664
1665         if (!data)
1666                 return 0;
1667
1668         ret = ip6gre_tap_validate(tb, data, extack);
1669         if (ret)
1670                 return ret;
1671
1672         /* ERSPAN should only have GRE sequence and key flag */
1673         if (data[IFLA_GRE_OFLAGS])
1674                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1675         if (data[IFLA_GRE_IFLAGS])
1676                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1677         if (!data[IFLA_GRE_COLLECT_METADATA] &&
1678             flags != (GRE_SEQ | GRE_KEY))
1679                 return -EINVAL;
1680
1681         /* ERSPAN Session ID only has 10-bit. Since we reuse
1682          * 32-bit key field as ID, check it's range.
1683          */
1684         if (data[IFLA_GRE_IKEY] &&
1685             (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1686                 return -EINVAL;
1687
1688         if (data[IFLA_GRE_OKEY] &&
1689             (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1690                 return -EINVAL;
1691
1692         if (data[IFLA_GRE_ERSPAN_VER]) {
1693                 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1694                 if (ver != 1 && ver != 2)
1695                         return -EINVAL;
1696         }
1697
1698         if (ver == 1) {
1699                 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1700                         u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1701
1702                         if (index & ~INDEX_MASK)
1703                                 return -EINVAL;
1704                 }
1705         } else if (ver == 2) {
1706                 if (data[IFLA_GRE_ERSPAN_DIR]) {
1707                         u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1708
1709                         if (dir & ~(DIR_MASK >> DIR_OFFSET))
1710                                 return -EINVAL;
1711                 }
1712
1713                 if (data[IFLA_GRE_ERSPAN_HWID]) {
1714                         u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1715
1716                         if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1717                                 return -EINVAL;
1718                 }
1719         }
1720
1721         return 0;
1722 }
1723
1724 static void ip6gre_netlink_parms(struct nlattr *data[],
1725                                 struct __ip6_tnl_parm *parms)
1726 {
1727         memset(parms, 0, sizeof(*parms));
1728
1729         if (!data)
1730                 return;
1731
1732         if (data[IFLA_GRE_LINK])
1733                 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1734
1735         if (data[IFLA_GRE_IFLAGS])
1736                 parms->i_flags = gre_flags_to_tnl_flags(
1737                                 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1738
1739         if (data[IFLA_GRE_OFLAGS])
1740                 parms->o_flags = gre_flags_to_tnl_flags(
1741                                 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1742
1743         if (data[IFLA_GRE_IKEY])
1744                 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1745
1746         if (data[IFLA_GRE_OKEY])
1747                 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1748
1749         if (data[IFLA_GRE_LOCAL])
1750                 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1751
1752         if (data[IFLA_GRE_REMOTE])
1753                 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1754
1755         if (data[IFLA_GRE_TTL])
1756                 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1757
1758         if (data[IFLA_GRE_ENCAP_LIMIT])
1759                 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1760
1761         if (data[IFLA_GRE_FLOWINFO])
1762                 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1763
1764         if (data[IFLA_GRE_FLAGS])
1765                 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1766
1767         if (data[IFLA_GRE_FWMARK])
1768                 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1769
1770         if (data[IFLA_GRE_COLLECT_METADATA])
1771                 parms->collect_md = true;
1772
1773         parms->erspan_ver = 1;
1774         if (data[IFLA_GRE_ERSPAN_VER])
1775                 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1776
1777         if (parms->erspan_ver == 1) {
1778                 if (data[IFLA_GRE_ERSPAN_INDEX])
1779                         parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1780         } else if (parms->erspan_ver == 2) {
1781                 if (data[IFLA_GRE_ERSPAN_DIR])
1782                         parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1783                 if (data[IFLA_GRE_ERSPAN_HWID])
1784                         parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1785         }
1786 }
1787
1788 static int ip6gre_tap_init(struct net_device *dev)
1789 {
1790         int ret;
1791
1792         ret = ip6gre_tunnel_init_common(dev);
1793         if (ret)
1794                 return ret;
1795
1796         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1797
1798         return 0;
1799 }
1800
1801 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1802         .ndo_init = ip6gre_tap_init,
1803         .ndo_uninit = ip6gre_tunnel_uninit,
1804         .ndo_start_xmit = ip6gre_tunnel_xmit,
1805         .ndo_set_mac_address = eth_mac_addr,
1806         .ndo_validate_addr = eth_validate_addr,
1807         .ndo_change_mtu = ip6_tnl_change_mtu,
1808         .ndo_get_stats64 = ip_tunnel_get_stats64,
1809         .ndo_get_iflink = ip6_tnl_get_iflink,
1810 };
1811
1812 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1813 {
1814         int t_hlen;
1815
1816         tunnel->tun_hlen = 8;
1817         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1818                        erspan_hdr_len(tunnel->parms.erspan_ver);
1819
1820         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1821         tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1822         return t_hlen;
1823 }
1824
1825 static int ip6erspan_tap_init(struct net_device *dev)
1826 {
1827         struct ip6_tnl *tunnel;
1828         int t_hlen;
1829         int ret;
1830
1831         tunnel = netdev_priv(dev);
1832
1833         tunnel->dev = dev;
1834         tunnel->net = dev_net(dev);
1835         strcpy(tunnel->parms.name, dev->name);
1836
1837         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1838         if (!dev->tstats)
1839                 return -ENOMEM;
1840
1841         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1842         if (ret)
1843                 goto cleanup_alloc_pcpu_stats;
1844
1845         ret = gro_cells_init(&tunnel->gro_cells, dev);
1846         if (ret)
1847                 goto cleanup_dst_cache_init;
1848
1849         t_hlen = ip6erspan_calc_hlen(tunnel);
1850         dev->mtu = ETH_DATA_LEN - t_hlen;
1851         if (dev->type == ARPHRD_ETHER)
1852                 dev->mtu -= ETH_HLEN;
1853         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1854                 dev->mtu -= 8;
1855
1856         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1857         ip6erspan_tnl_link_config(tunnel, 1);
1858
1859         return 0;
1860
1861 cleanup_dst_cache_init:
1862         dst_cache_destroy(&tunnel->dst_cache);
1863 cleanup_alloc_pcpu_stats:
1864         free_percpu(dev->tstats);
1865         dev->tstats = NULL;
1866         return ret;
1867 }
1868
1869 static const struct net_device_ops ip6erspan_netdev_ops = {
1870         .ndo_init =             ip6erspan_tap_init,
1871         .ndo_uninit =           ip6erspan_tunnel_uninit,
1872         .ndo_start_xmit =       ip6erspan_tunnel_xmit,
1873         .ndo_set_mac_address =  eth_mac_addr,
1874         .ndo_validate_addr =    eth_validate_addr,
1875         .ndo_change_mtu =       ip6_tnl_change_mtu,
1876         .ndo_get_stats64 =      ip_tunnel_get_stats64,
1877         .ndo_get_iflink =       ip6_tnl_get_iflink,
1878 };
1879
1880 static void ip6gre_tap_setup(struct net_device *dev)
1881 {
1882
1883         ether_setup(dev);
1884
1885         dev->max_mtu = 0;
1886         dev->netdev_ops = &ip6gre_tap_netdev_ops;
1887         dev->needs_free_netdev = true;
1888         dev->priv_destructor = ip6gre_dev_free;
1889
1890         dev->features |= NETIF_F_NETNS_LOCAL;
1891         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1892         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1893         netif_keep_dst(dev);
1894 }
1895
1896 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1897                                        struct ip_tunnel_encap *ipencap)
1898 {
1899         bool ret = false;
1900
1901         memset(ipencap, 0, sizeof(*ipencap));
1902
1903         if (!data)
1904                 return ret;
1905
1906         if (data[IFLA_GRE_ENCAP_TYPE]) {
1907                 ret = true;
1908                 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1909         }
1910
1911         if (data[IFLA_GRE_ENCAP_FLAGS]) {
1912                 ret = true;
1913                 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1914         }
1915
1916         if (data[IFLA_GRE_ENCAP_SPORT]) {
1917                 ret = true;
1918                 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1919         }
1920
1921         if (data[IFLA_GRE_ENCAP_DPORT]) {
1922                 ret = true;
1923                 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1924         }
1925
1926         return ret;
1927 }
1928
1929 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1930                                  struct nlattr *tb[], struct nlattr *data[],
1931                                  struct netlink_ext_ack *extack)
1932 {
1933         struct ip6_tnl *nt;
1934         struct ip_tunnel_encap ipencap;
1935         int err;
1936
1937         nt = netdev_priv(dev);
1938
1939         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1940                 int err = ip6_tnl_encap_setup(nt, &ipencap);
1941
1942                 if (err < 0)
1943                         return err;
1944         }
1945
1946         if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1947                 eth_hw_addr_random(dev);
1948
1949         nt->dev = dev;
1950         nt->net = dev_net(dev);
1951
1952         err = register_netdevice(dev);
1953         if (err)
1954                 goto out;
1955
1956         if (tb[IFLA_MTU])
1957                 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1958
1959         dev_hold(dev);
1960
1961 out:
1962         return err;
1963 }
1964
1965 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1966                           struct nlattr *tb[], struct nlattr *data[],
1967                           struct netlink_ext_ack *extack)
1968 {
1969         struct ip6_tnl *nt = netdev_priv(dev);
1970         struct net *net = dev_net(dev);
1971         struct ip6gre_net *ign;
1972         int err;
1973
1974         ip6gre_netlink_parms(data, &nt->parms);
1975         ign = net_generic(net, ip6gre_net_id);
1976
1977         if (nt->parms.collect_md) {
1978                 if (rtnl_dereference(ign->collect_md_tun))
1979                         return -EEXIST;
1980         } else {
1981                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1982                         return -EEXIST;
1983         }
1984
1985         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
1986         if (!err) {
1987                 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1988                 ip6gre_tunnel_link_md(ign, nt);
1989                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
1990         }
1991         return err;
1992 }
1993
1994 static struct ip6_tnl *
1995 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
1996                          struct nlattr *data[], struct __ip6_tnl_parm *p_p,
1997                          struct netlink_ext_ack *extack)
1998 {
1999         struct ip6_tnl *t, *nt = netdev_priv(dev);
2000         struct net *net = nt->net;
2001         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2002         struct ip_tunnel_encap ipencap;
2003
2004         if (dev == ign->fb_tunnel_dev)
2005                 return ERR_PTR(-EINVAL);
2006
2007         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2008                 int err = ip6_tnl_encap_setup(nt, &ipencap);
2009
2010                 if (err < 0)
2011                         return ERR_PTR(err);
2012         }
2013
2014         ip6gre_netlink_parms(data, p_p);
2015
2016         t = ip6gre_tunnel_locate(net, p_p, 0);
2017
2018         if (t) {
2019                 if (t->dev != dev)
2020                         return ERR_PTR(-EEXIST);
2021         } else {
2022                 t = nt;
2023         }
2024
2025         return t;
2026 }
2027
2028 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2029                              struct nlattr *data[],
2030                              struct netlink_ext_ack *extack)
2031 {
2032         struct ip6_tnl *t = netdev_priv(dev);
2033         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2034         struct __ip6_tnl_parm p;
2035
2036         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2037         if (IS_ERR(t))
2038                 return PTR_ERR(t);
2039
2040         ip6gre_tunnel_unlink_md(ign, t);
2041         ip6gre_tunnel_unlink(ign, t);
2042         ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2043         ip6gre_tunnel_link_md(ign, t);
2044         ip6gre_tunnel_link(ign, t);
2045         return 0;
2046 }
2047
2048 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2049 {
2050         struct net *net = dev_net(dev);
2051         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2052
2053         if (dev != ign->fb_tunnel_dev)
2054                 unregister_netdevice_queue(dev, head);
2055 }
2056
2057 static size_t ip6gre_get_size(const struct net_device *dev)
2058 {
2059         return
2060                 /* IFLA_GRE_LINK */
2061                 nla_total_size(4) +
2062                 /* IFLA_GRE_IFLAGS */
2063                 nla_total_size(2) +
2064                 /* IFLA_GRE_OFLAGS */
2065                 nla_total_size(2) +
2066                 /* IFLA_GRE_IKEY */
2067                 nla_total_size(4) +
2068                 /* IFLA_GRE_OKEY */
2069                 nla_total_size(4) +
2070                 /* IFLA_GRE_LOCAL */
2071                 nla_total_size(sizeof(struct in6_addr)) +
2072                 /* IFLA_GRE_REMOTE */
2073                 nla_total_size(sizeof(struct in6_addr)) +
2074                 /* IFLA_GRE_TTL */
2075                 nla_total_size(1) +
2076                 /* IFLA_GRE_ENCAP_LIMIT */
2077                 nla_total_size(1) +
2078                 /* IFLA_GRE_FLOWINFO */
2079                 nla_total_size(4) +
2080                 /* IFLA_GRE_FLAGS */
2081                 nla_total_size(4) +
2082                 /* IFLA_GRE_ENCAP_TYPE */
2083                 nla_total_size(2) +
2084                 /* IFLA_GRE_ENCAP_FLAGS */
2085                 nla_total_size(2) +
2086                 /* IFLA_GRE_ENCAP_SPORT */
2087                 nla_total_size(2) +
2088                 /* IFLA_GRE_ENCAP_DPORT */
2089                 nla_total_size(2) +
2090                 /* IFLA_GRE_COLLECT_METADATA */
2091                 nla_total_size(0) +
2092                 /* IFLA_GRE_FWMARK */
2093                 nla_total_size(4) +
2094                 /* IFLA_GRE_ERSPAN_INDEX */
2095                 nla_total_size(4) +
2096                 0;
2097 }
2098
2099 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2100 {
2101         struct ip6_tnl *t = netdev_priv(dev);
2102         struct __ip6_tnl_parm *p = &t->parms;
2103
2104         if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2105             nla_put_be16(skb, IFLA_GRE_IFLAGS,
2106                          gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2107             nla_put_be16(skb, IFLA_GRE_OFLAGS,
2108                          gre_tnl_flags_to_gre_flags(p->o_flags)) ||
2109             nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2110             nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2111             nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2112             nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2113             nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2114             nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2115             nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2116             nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2117             nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
2118             nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2119                 goto nla_put_failure;
2120
2121         if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2122                         t->encap.type) ||
2123             nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2124                          t->encap.sport) ||
2125             nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2126                          t->encap.dport) ||
2127             nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2128                         t->encap.flags))
2129                 goto nla_put_failure;
2130
2131         if (p->collect_md) {
2132                 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2133                         goto nla_put_failure;
2134         }
2135
2136         if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2137                 goto nla_put_failure;
2138
2139         if (p->erspan_ver == 1) {
2140                 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2141                         goto nla_put_failure;
2142         } else if (p->erspan_ver == 2) {
2143                 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2144                         goto nla_put_failure;
2145                 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2146                         goto nla_put_failure;
2147         }
2148
2149         return 0;
2150
2151 nla_put_failure:
2152         return -EMSGSIZE;
2153 }
2154
2155 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2156         [IFLA_GRE_LINK]        = { .type = NLA_U32 },
2157         [IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2158         [IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2159         [IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2160         [IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2161         [IFLA_GRE_LOCAL]       = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2162         [IFLA_GRE_REMOTE]      = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2163         [IFLA_GRE_TTL]         = { .type = NLA_U8 },
2164         [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2165         [IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2166         [IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2167         [IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2168         [IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2169         [IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2170         [IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2171         [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2172         [IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2173         [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2174         [IFLA_GRE_ERSPAN_VER]   = { .type = NLA_U8 },
2175         [IFLA_GRE_ERSPAN_DIR]   = { .type = NLA_U8 },
2176         [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
2177 };
2178
2179 static void ip6erspan_tap_setup(struct net_device *dev)
2180 {
2181         ether_setup(dev);
2182
2183         dev->netdev_ops = &ip6erspan_netdev_ops;
2184         dev->needs_free_netdev = true;
2185         dev->priv_destructor = ip6gre_dev_free;
2186
2187         dev->features |= NETIF_F_NETNS_LOCAL;
2188         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2189         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2190         netif_keep_dst(dev);
2191 }
2192
2193 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2194                              struct nlattr *tb[], struct nlattr *data[],
2195                              struct netlink_ext_ack *extack)
2196 {
2197         struct ip6_tnl *nt = netdev_priv(dev);
2198         struct net *net = dev_net(dev);
2199         struct ip6gre_net *ign;
2200         int err;
2201
2202         ip6gre_netlink_parms(data, &nt->parms);
2203         ign = net_generic(net, ip6gre_net_id);
2204
2205         if (nt->parms.collect_md) {
2206                 if (rtnl_dereference(ign->collect_md_tun_erspan))
2207                         return -EEXIST;
2208         } else {
2209                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2210                         return -EEXIST;
2211         }
2212
2213         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2214         if (!err) {
2215                 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2216                 ip6erspan_tunnel_link_md(ign, nt);
2217                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2218         }
2219         return err;
2220 }
2221
2222 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2223 {
2224         ip6gre_tnl_link_config_common(t);
2225         ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2226 }
2227
2228 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2229                                 const struct __ip6_tnl_parm *p, int set_mtu)
2230 {
2231         ip6gre_tnl_copy_tnl_parm(t, p);
2232         ip6erspan_tnl_link_config(t, set_mtu);
2233         return 0;
2234 }
2235
2236 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2237                                 struct nlattr *data[],
2238                                 struct netlink_ext_ack *extack)
2239 {
2240         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2241         struct __ip6_tnl_parm p;
2242         struct ip6_tnl *t;
2243
2244         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2245         if (IS_ERR(t))
2246                 return PTR_ERR(t);
2247
2248         ip6gre_tunnel_unlink_md(ign, t);
2249         ip6gre_tunnel_unlink(ign, t);
2250         ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2251         ip6erspan_tunnel_link_md(ign, t);
2252         ip6gre_tunnel_link(ign, t);
2253         return 0;
2254 }
2255
2256 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2257         .kind           = "ip6gre",
2258         .maxtype        = IFLA_GRE_MAX,
2259         .policy         = ip6gre_policy,
2260         .priv_size      = sizeof(struct ip6_tnl),
2261         .setup          = ip6gre_tunnel_setup,
2262         .validate       = ip6gre_tunnel_validate,
2263         .newlink        = ip6gre_newlink,
2264         .changelink     = ip6gre_changelink,
2265         .dellink        = ip6gre_dellink,
2266         .get_size       = ip6gre_get_size,
2267         .fill_info      = ip6gre_fill_info,
2268         .get_link_net   = ip6_tnl_get_link_net,
2269 };
2270
2271 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2272         .kind           = "ip6gretap",
2273         .maxtype        = IFLA_GRE_MAX,
2274         .policy         = ip6gre_policy,
2275         .priv_size      = sizeof(struct ip6_tnl),
2276         .setup          = ip6gre_tap_setup,
2277         .validate       = ip6gre_tap_validate,
2278         .newlink        = ip6gre_newlink,
2279         .changelink     = ip6gre_changelink,
2280         .get_size       = ip6gre_get_size,
2281         .fill_info      = ip6gre_fill_info,
2282         .get_link_net   = ip6_tnl_get_link_net,
2283 };
2284
2285 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2286         .kind           = "ip6erspan",
2287         .maxtype        = IFLA_GRE_MAX,
2288         .policy         = ip6gre_policy,
2289         .priv_size      = sizeof(struct ip6_tnl),
2290         .setup          = ip6erspan_tap_setup,
2291         .validate       = ip6erspan_tap_validate,
2292         .newlink        = ip6erspan_newlink,
2293         .changelink     = ip6erspan_changelink,
2294         .get_size       = ip6gre_get_size,
2295         .fill_info      = ip6gre_fill_info,
2296         .get_link_net   = ip6_tnl_get_link_net,
2297 };
2298
2299 /*
2300  *      And now the modules code and kernel interface.
2301  */
2302
2303 static int __init ip6gre_init(void)
2304 {
2305         int err;
2306
2307         pr_info("GRE over IPv6 tunneling driver\n");
2308
2309         err = register_pernet_device(&ip6gre_net_ops);
2310         if (err < 0)
2311                 return err;
2312
2313         err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2314         if (err < 0) {
2315                 pr_info("%s: can't add protocol\n", __func__);
2316                 goto add_proto_failed;
2317         }
2318
2319         err = rtnl_link_register(&ip6gre_link_ops);
2320         if (err < 0)
2321                 goto rtnl_link_failed;
2322
2323         err = rtnl_link_register(&ip6gre_tap_ops);
2324         if (err < 0)
2325                 goto tap_ops_failed;
2326
2327         err = rtnl_link_register(&ip6erspan_tap_ops);
2328         if (err < 0)
2329                 goto erspan_link_failed;
2330
2331 out:
2332         return err;
2333
2334 erspan_link_failed:
2335         rtnl_link_unregister(&ip6gre_tap_ops);
2336 tap_ops_failed:
2337         rtnl_link_unregister(&ip6gre_link_ops);
2338 rtnl_link_failed:
2339         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2340 add_proto_failed:
2341         unregister_pernet_device(&ip6gre_net_ops);
2342         goto out;
2343 }
2344
2345 static void __exit ip6gre_fini(void)
2346 {
2347         rtnl_link_unregister(&ip6gre_tap_ops);
2348         rtnl_link_unregister(&ip6gre_link_ops);
2349         rtnl_link_unregister(&ip6erspan_tap_ops);
2350         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2351         unregister_pernet_device(&ip6gre_net_ops);
2352 }
2353
2354 module_init(ip6gre_init);
2355 module_exit(ip6gre_fini);
2356 MODULE_LICENSE("GPL");
2357 MODULE_AUTHOR("D. Kozlov ([email protected])");
2358 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2359 MODULE_ALIAS_RTNL_LINK("ip6gre");
2360 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2361 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2362 MODULE_ALIAS_NETDEV("ip6gre0");