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 void 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 gre_base_hdr *greh;
 431         const struct ipv6hdr *ipv6h;
 432         int grehlen = sizeof(*greh);
 433         struct ip6_tnl *t;
 434         int key_off = 0;
 435         __be16 flags;
 436         __be32 key;
 437
 438         if (!pskb_may_pull(skb, offset + grehlen))
 439                 return;
 440         greh = (const struct gre_base_hdr *)(skb->data + offset);
 441         flags = greh->flags;
 442         if (flags & (GRE_VERSION | GRE_ROUTING))
 443                 return;
 444         if (flags & GRE_CSUM)
 445                 grehlen += 4;
 446         if (flags & GRE_KEY) {
 447                 key_off = grehlen + offset;
 448                 grehlen += 4;
 449         }
 450
 451         if (!pskb_may_pull(skb, offset + grehlen))
 452                 return;
 453         ipv6h = (const struct ipv6hdr *)skb->data;
 454         greh = (const struct gre_base_hdr *)(skb->data + offset);
 455         key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
 456
 457         t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
 458                                  key, greh->protocol);
 459         if (!t)
 460                 return;
 461
 462         switch (type) {
 463                 struct ipv6_tlv_tnl_enc_lim *tel;
 464                 __u32 teli;
 465         case ICMPV6_DEST_UNREACH:
 466                 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
 467                                     t->parms.name);
 468                 if (code != ICMPV6_PORT_UNREACH)
 469                         break;
 470                 return;
 471         case ICMPV6_TIME_EXCEED:
 472                 if (code == ICMPV6_EXC_HOPLIMIT) {
 473                         net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
 474                                             t->parms.name);
 475                         break;
 476                 }
 477                 return;
 478         case ICMPV6_PARAMPROB:
 479                 teli = 0;
 480                 if (code == ICMPV6_HDR_FIELD)
 481                         teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
 482
 483                 if (teli && teli == be32_to_cpu(info) - 2) {
 484                         tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
 485                         if (tel->encap_limit == 0) {
 486                                 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
 487                                                     t->parms.name);
 488                         }
 489                 } else {
 490                         net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
 491                                             t->parms.name);
 492                 }
 493                 return;
 494         case ICMPV6_PKT_TOOBIG:
 495                 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
 496                 return;
 497         case NDISC_REDIRECT:
 498                 ip6_redirect(skb, net, skb->dev->ifindex, 0,
 499                              sock_net_uid(net, NULL));
 500                 return;
 501         }
 502
 503         if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
 504                 t->err_count++;
 505         else
 506                 t->err_count = 1;
 507         t->err_time = jiffies;
 508 }
 509
 510 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
 511 {
 512         const struct ipv6hdr *ipv6h;
 513         struct ip6_tnl *tunnel;
 514
 515         ipv6h = ipv6_hdr(skb);
 516         tunnel = ip6gre_tunnel_lookup(skb->dev,
 517                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 518                                       tpi->proto);
 519         if (tunnel) {
 520                 if (tunnel->parms.collect_md) {
 521                         struct metadata_dst *tun_dst;
 522                         __be64 tun_id;
 523                         __be16 flags;
 524
 525                         flags = tpi->flags;
 526                         tun_id = key32_to_tunnel_id(tpi->key);
 527
 528                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
 529                         if (!tun_dst)
 530                                 return PACKET_REJECT;
 531
 532                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 533                 } else {
 534                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 535                 }
 536
 537                 return PACKET_RCVD;
 538         }
 539
 540         return PACKET_REJECT;
 541 }
 542
 543 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
 544                          struct tnl_ptk_info *tpi)
 545 {
 546         struct erspan_base_hdr *ershdr;
 547         struct erspan_metadata *pkt_md;
 548         const struct ipv6hdr *ipv6h;
 549         struct erspan_md2 *md2;
 550         struct ip6_tnl *tunnel;
 551         u8 ver;
 552
 553         if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
 554                 return PACKET_REJECT;
 555
 556         ipv6h = ipv6_hdr(skb);
 557         ershdr = (struct erspan_base_hdr *)skb->data;
 558         ver = ershdr->ver;
 559         tpi->key = cpu_to_be32(get_session_id(ershdr));
 560
 561         tunnel = ip6gre_tunnel_lookup(skb->dev,
 562                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 563                                       tpi->proto);
 564         if (tunnel) {
 565                 int len = erspan_hdr_len(ver);
 566
 567                 if (unlikely(!pskb_may_pull(skb, len)))
 568                         return PACKET_REJECT;
 569
 570                 ershdr = (struct erspan_base_hdr *)skb->data;
 571                 pkt_md = (struct erspan_metadata *)(ershdr + 1);
 572
 573                 if (__iptunnel_pull_header(skb, len,
 574                                            htons(ETH_P_TEB),
 575                                            false, false) < 0)
 576                         return PACKET_REJECT;
 577
 578                 if (tunnel->parms.collect_md) {
 579                         struct metadata_dst *tun_dst;
 580                         struct ip_tunnel_info *info;
 581                         struct erspan_metadata *md;
 582                         __be64 tun_id;
 583                         __be16 flags;
 584
 585                         tpi->flags |= TUNNEL_KEY;
 586                         flags = tpi->flags;
 587                         tun_id = key32_to_tunnel_id(tpi->key);
 588
 589                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
 590                                                   sizeof(*md));
 591                         if (!tun_dst)
 592                                 return PACKET_REJECT;
 593
 594                         info = &tun_dst->u.tun_info;
 595                         md = ip_tunnel_info_opts(info);
 596                         md->version = ver;
 597                         md2 = &md->u.md2;
 598                         memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
 599                                                        ERSPAN_V2_MDSIZE);
 600                         info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
 601                         info->options_len = sizeof(*md);
 602
 603                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 604
 605                 } else {
 606                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 607                 }
 608
 609                 return PACKET_RCVD;
 610         }
 611
 612         return PACKET_REJECT;
 613 }
 614
 615 static int gre_rcv(struct sk_buff *skb)
 616 {
 617         struct tnl_ptk_info tpi;
 618         bool csum_err = false;
 619         int hdr_len;
 620
 621         hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
 622         if (hdr_len < 0)
 623                 goto drop;
 624
 625         if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 626                 goto drop;
 627
 628         if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
 629                      tpi.proto == htons(ETH_P_ERSPAN2))) {
 630                 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
 631                         return 0;
 632                 goto out;
 633         }
 634
 635         if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 636                 return 0;
 637
 638 out:
 639         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 640 drop:
 641         kfree_skb(skb);
 642         return 0;
 643 }
 644
 645 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 646 {
 647         return iptunnel_handle_offloads(skb,
 648                                         csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 649 }
 650
 651 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
 652                                      struct net_device *dev,
 653                                      struct flowi6 *fl6, __u8 *dsfield,
 654                                      int *encap_limit)
 655 {
 656         const struct iphdr *iph = ip_hdr(skb);
 657         struct ip6_tnl *t = netdev_priv(dev);
 658
 659         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 660                 *encap_limit = t->parms.encap_limit;
 661
 662         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 663
 664         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 665                 *dsfield = ipv4_get_dsfield(iph);
 666         else
 667                 *dsfield = ip6_tclass(t->parms.flowinfo);
 668
 669         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 670                 fl6->flowi6_mark = skb->mark;
 671         else
 672                 fl6->flowi6_mark = t->parms.fwmark;
 673
 674         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 675 }
 676
 677 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
 678                                     struct net_device *dev,
 679                                     struct flowi6 *fl6, __u8 *dsfield,
 680                                     int *encap_limit)
 681 {
 682         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 683         struct ip6_tnl *t = netdev_priv(dev);
 684         __u16 offset;
 685
 686         offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
 687         /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
 688
 689         if (offset > 0) {
 690                 struct ipv6_tlv_tnl_enc_lim *tel;
 691
 692                 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
 693                 if (tel->encap_limit == 0) {
 694                         icmpv6_send(skb, ICMPV6_PARAMPROB,
 695                                     ICMPV6_HDR_FIELD, offset + 2);
 696                         return -1;
 697                 }
 698                 *encap_limit = tel->encap_limit - 1;
 699         } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
 700                 *encap_limit = t->parms.encap_limit;
 701         }
 702
 703         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 704
 705         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 706                 *dsfield = ipv6_get_dsfield(ipv6h);
 707         else
 708                 *dsfield = ip6_tclass(t->parms.flowinfo);
 709
 710         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 711                 fl6->flowlabel |= ip6_flowlabel(ipv6h);
 712
 713         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 714                 fl6->flowi6_mark = skb->mark;
 715         else
 716                 fl6->flowi6_mark = t->parms.fwmark;
 717
 718         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 719
 720         return 0;
 721 }
 722
 723 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
 724                                struct net_device *dev, __u8 dsfield,
 725                                struct flowi6 *fl6, int encap_limit,
 726                                __u32 *pmtu, __be16 proto)
 727 {
 728         struct ip6_tnl *tunnel = netdev_priv(dev);
 729         __be16 protocol;
 730
 731         if (dev->type == ARPHRD_ETHER)
 732                 IPCB(skb)->flags = 0;
 733
 734         if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
 735                 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
 736         else
 737                 fl6->daddr = tunnel->parms.raddr;
 738
 739         if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
 740                 return -ENOMEM;
 741
 742         /* Push GRE header. */
 743         protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
 744
 745         if (tunnel->parms.collect_md) {
 746                 struct ip_tunnel_info *tun_info;
 747                 const struct ip_tunnel_key *key;
 748                 __be16 flags;
 749
 750                 tun_info = skb_tunnel_info(skb);
 751                 if (unlikely(!tun_info ||
 752                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
 753                              ip_tunnel_info_af(tun_info) != AF_INET6))
 754                         return -EINVAL;
 755
 756                 key = &tun_info->key;
 757                 memset(fl6, 0, sizeof(*fl6));
 758                 fl6->flowi6_proto = IPPROTO_GRE;
 759                 fl6->daddr = key->u.ipv6.dst;
 760                 fl6->flowlabel = key->label;
 761                 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 762
 763                 dsfield = key->tos;
 764                 flags = key->tun_flags &
 765                         (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
 766                 tunnel->tun_hlen = gre_calc_hlen(flags);
 767
 768                 gre_build_header(skb, tunnel->tun_hlen,
 769                                  flags, protocol,
 770                                  tunnel_id_to_key32(tun_info->key.tun_id),
 771                                  (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
 772                                                       : 0);
 773
 774         } else {
 775                 if (tunnel->parms.o_flags & TUNNEL_SEQ)
 776                         tunnel->o_seqno++;
 777
 778                 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
 779                                  protocol, tunnel->parms.o_key,
 780                                  htonl(tunnel->o_seqno));
 781         }
 782
 783         return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
 784                             NEXTHDR_GRE);
 785 }
 786
 787 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
 788 {
 789         struct ip6_tnl *t = netdev_priv(dev);
 790         int encap_limit = -1;
 791         struct flowi6 fl6;
 792         __u8 dsfield = 0;
 793         __u32 mtu;
 794         int err;
 795
 796         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 797
 798         if (!t->parms.collect_md)
 799                 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
 800                                          &dsfield, &encap_limit);
 801
 802         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 803         if (err)
 804                 return -1;
 805
 806         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
 807                           skb->protocol);
 808         if (err != 0) {
 809                 /* XXX: send ICMP error even if DF is not set. */
 810                 if (err == -EMSGSIZE)
 811                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 812                                   htonl(mtu));
 813                 return -1;
 814         }
 815
 816         return 0;
 817 }
 818
 819 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
 820 {
 821         struct ip6_tnl *t = netdev_priv(dev);
 822         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 823         int encap_limit = -1;
 824         struct flowi6 fl6;
 825         __u8 dsfield = 0;
 826         __u32 mtu;
 827         int err;
 828
 829         if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
 830                 return -1;
 831
 832         if (!t->parms.collect_md &&
 833             prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
 834                 return -1;
 835
 836         if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
 837                 return -1;
 838
 839         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
 840                           &mtu, skb->protocol);
 841         if (err != 0) {
 842                 if (err == -EMSGSIZE)
 843                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 844                 return -1;
 845         }
 846
 847         return 0;
 848 }
 849
 850 /**
 851  * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
 852  *   @t: the outgoing tunnel device
 853  *   @hdr: IPv6 header from the incoming packet
 854  *
 855  * Description:
 856  *   Avoid trivial tunneling loop by checking that tunnel exit-point
 857  *   doesn't match source of incoming packet.
 858  *
 859  * Return:
 860  *   1 if conflict,
 861  *   0 else
 862  **/
 863
 864 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
 865         const struct ipv6hdr *hdr)
 866 {
 867         return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
 868 }
 869
 870 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
 871 {
 872         struct ip6_tnl *t = netdev_priv(dev);
 873         int encap_limit = -1;
 874         struct flowi6 fl6;
 875         __u32 mtu;
 876         int err;
 877
 878         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 879                 encap_limit = t->parms.encap_limit;
 880
 881         if (!t->parms.collect_md)
 882                 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
 883
 884         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 885         if (err)
 886                 return err;
 887
 888         err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
 889
 890         return err;
 891 }
 892
 893 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
 894         struct net_device *dev)
 895 {
 896         struct ip6_tnl *t = netdev_priv(dev);
 897         struct net_device_stats *stats = &t->dev->stats;
 898         int ret;
 899
 900         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 901                 goto tx_err;
 902
 903         switch (skb->protocol) {
 904         case htons(ETH_P_IP):
 905                 ret = ip6gre_xmit_ipv4(skb, dev);
 906                 break;
 907         case htons(ETH_P_IPV6):
 908                 ret = ip6gre_xmit_ipv6(skb, dev);
 909                 break;
 910         default:
 911                 ret = ip6gre_xmit_other(skb, dev);
 912                 break;
 913         }
 914
 915         if (ret < 0)
 916                 goto tx_err;
 917
 918         return NETDEV_TX_OK;
 919
 920 tx_err:
 921         stats->tx_errors++;
 922         stats->tx_dropped++;
 923         kfree_skb(skb);
 924         return NETDEV_TX_OK;
 925 }
 926
 927 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 928                                          struct net_device *dev)
 929 {
 930         struct ip6_tnl *t = netdev_priv(dev);
 931         struct dst_entry *dst = skb_dst(skb);
 932         struct net_device_stats *stats;
 933         bool truncate = false;
 934         int encap_limit = -1;
 935         __u8 dsfield = false;
 936         struct flowi6 fl6;
 937         int err = -EINVAL;
 938         __u32 mtu;
 939         int nhoff;
 940         int thoff;
 941
 942         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 943                 goto tx_err;
 944
 945         if (gre_handle_offloads(skb, false))
 946                 goto tx_err;
 947
 948         if (skb->len > dev->mtu + dev->hard_header_len) {
 949                 pskb_trim(skb, dev->mtu + dev->hard_header_len);
 950                 truncate = true;
 951         }
 952
 953         nhoff = skb_network_header(skb) - skb_mac_header(skb);
 954         if (skb->protocol == htons(ETH_P_IP) &&
 955             (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
 956                 truncate = true;
 957
 958         thoff = skb_transport_header(skb) - skb_mac_header(skb);
 959         if (skb->protocol == htons(ETH_P_IPV6) &&
 960             (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
 961                 truncate = true;
 962
 963         if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
 964                 goto tx_err;
 965
 966         t->parms.o_flags &= ~TUNNEL_KEY;
 967         IPCB(skb)->flags = 0;
 968
 969         /* For collect_md mode, derive fl6 from the tunnel key,
 970          * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
 971          */
 972         if (t->parms.collect_md) {
 973                 struct ip_tunnel_info *tun_info;
 974                 const struct ip_tunnel_key *key;
 975                 struct erspan_metadata *md;
 976                 __be32 tun_id;
 977
 978                 tun_info = skb_tunnel_info(skb);
 979                 if (unlikely(!tun_info ||
 980                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
 981                              ip_tunnel_info_af(tun_info) != AF_INET6))
 982                         return -EINVAL;
 983
 984                 key = &tun_info->key;
 985                 memset(&fl6, 0, sizeof(fl6));
 986                 fl6.flowi6_proto = IPPROTO_GRE;
 987                 fl6.daddr = key->u.ipv6.dst;
 988                 fl6.flowlabel = key->label;
 989                 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 990
 991                 dsfield = key->tos;
 992                 md = ip_tunnel_info_opts(tun_info);
 993                 if (!md)
 994                         goto tx_err;
 995
 996                 tun_id = tunnel_id_to_key32(key->tun_id);
 997                 if (md->version == 1) {
 998                         erspan_build_header(skb,
 999                                             ntohl(tun_id),
1000                                             ntohl(md->u.index), truncate,
1001                                             false);
1002                 } else if (md->version == 2) {
1003                         erspan_build_header_v2(skb,
1004                                                ntohl(tun_id),
1005                                                md->u.md2.dir,
1006                                                get_hwid(&md->u.md2),
1007                                                truncate, false);
1008                 } else {
1009                         goto tx_err;
1010                 }
1011         } else {
1012                 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
1013
1014                 switch (skb->protocol) {
1015                 case htons(ETH_P_IP):
1016                         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1017                         prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1018                                                  &dsfield, &encap_limit);
1019                         break;
1020                 case htons(ETH_P_IPV6):
1021                         if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
1022                                 goto tx_err;
1023                         if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1024                                                      &dsfield, &encap_limit))
1025                                 goto tx_err;
1026                         break;
1027                 default:
1028                         memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1029                         break;
1030                 }
1031
1032                 if (t->parms.erspan_ver == 1)
1033                         erspan_build_header(skb, ntohl(t->parms.o_key),
1034                                             t->parms.index,
1035                                             truncate, false);
1036                 else if (t->parms.erspan_ver == 2)
1037                         erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1038                                                t->parms.dir,
1039                                                t->parms.hwid,
1040                                                truncate, false);
1041                 else
1042                         goto tx_err;
1043
1044                 fl6.daddr = t->parms.raddr;
1045         }
1046
1047         /* Push GRE header. */
1048         gre_build_header(skb, 8, TUNNEL_SEQ,
1049                          htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
1050
1051         /* TooBig packet may have updated dst->dev's mtu */
1052         if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1053                 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1054
1055         err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1056                            NEXTHDR_GRE);
1057         if (err != 0) {
1058                 /* XXX: send ICMP error even if DF is not set. */
1059                 if (err == -EMSGSIZE) {
1060                         if (skb->protocol == htons(ETH_P_IP))
1061                                 icmp_send(skb, ICMP_DEST_UNREACH,
1062                                           ICMP_FRAG_NEEDED, htonl(mtu));
1063                         else
1064                                 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1065                 }
1066
1067                 goto tx_err;
1068         }
1069         return NETDEV_TX_OK;
1070
1071 tx_err:
1072         stats = &t->dev->stats;
1073         stats->tx_errors++;
1074         stats->tx_dropped++;
1075         kfree_skb(skb);
1076         return NETDEV_TX_OK;
1077 }
1078
1079 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1080 {
1081         struct net_device *dev = t->dev;
1082         struct __ip6_tnl_parm *p = &t->parms;
1083         struct flowi6 *fl6 = &t->fl.u.ip6;
1084
1085         if (dev->type != ARPHRD_ETHER) {
1086                 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1087                 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1088         }
1089
1090         /* Set up flowi template */
1091         fl6->saddr = p->laddr;
1092         fl6->daddr = p->raddr;
1093         fl6->flowi6_oif = p->link;
1094         fl6->flowlabel = 0;
1095         fl6->flowi6_proto = IPPROTO_GRE;
1096
1097         if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1098                 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1099         if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1100                 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1101
1102         p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1103         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1104
1105         if (p->flags&IP6_TNL_F_CAP_XMIT &&
1106                         p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1107                 dev->flags |= IFF_POINTOPOINT;
1108         else
1109                 dev->flags &= ~IFF_POINTOPOINT;
1110 }
1111
1112 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1113                                          int t_hlen)
1114 {
1115         const struct __ip6_tnl_parm *p = &t->parms;
1116         struct net_device *dev = t->dev;
1117
1118         if (p->flags & IP6_TNL_F_CAP_XMIT) {
1119                 int strict = (ipv6_addr_type(&p->raddr) &
1120                               (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1121
1122                 struct rt6_info *rt = rt6_lookup(t->net,
1123                                                  &p->raddr, &p->laddr,
1124                                                  p->link, NULL, strict);
1125
1126                 if (!rt)
1127                         return;
1128
1129                 if (rt->dst.dev) {
1130                         dev->hard_header_len = rt->dst.dev->hard_header_len +
1131                                                t_hlen;
1132
1133                         if (set_mtu) {
1134                                 dev->mtu = rt->dst.dev->mtu - t_hlen;
1135                                 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1136                                         dev->mtu -= 8;
1137                                 if (dev->type == ARPHRD_ETHER)
1138                                         dev->mtu -= ETH_HLEN;
1139
1140                                 if (dev->mtu < IPV6_MIN_MTU)
1141                                         dev->mtu = IPV6_MIN_MTU;
1142                         }
1143                 }
1144                 ip6_rt_put(rt);
1145         }
1146 }
1147
1148 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1149 {
1150         int t_hlen;
1151
1152         tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1153         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1154
1155         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1156         tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1157         return t_hlen;
1158 }
1159
1160 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1161 {
1162         ip6gre_tnl_link_config_common(t);
1163         ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1164 }
1165
1166 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1167                                      const struct __ip6_tnl_parm *p)
1168 {
1169         t->parms.laddr = p->laddr;
1170         t->parms.raddr = p->raddr;
1171         t->parms.flags = p->flags;
1172         t->parms.hop_limit = p->hop_limit;
1173         t->parms.encap_limit = p->encap_limit;
1174         t->parms.flowinfo = p->flowinfo;
1175         t->parms.link = p->link;
1176         t->parms.proto = p->proto;
1177         t->parms.i_key = p->i_key;
1178         t->parms.o_key = p->o_key;
1179         t->parms.i_flags = p->i_flags;
1180         t->parms.o_flags = p->o_flags;
1181         t->parms.fwmark = p->fwmark;
1182         dst_cache_reset(&t->dst_cache);
1183 }
1184
1185 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1186                              int set_mtu)
1187 {
1188         ip6gre_tnl_copy_tnl_parm(t, p);
1189         ip6gre_tnl_link_config(t, set_mtu);
1190         return 0;
1191 }
1192
1193 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1194         const struct ip6_tnl_parm2 *u)
1195 {
1196         p->laddr = u->laddr;
1197         p->raddr = u->raddr;
1198         p->flags = u->flags;
1199         p->hop_limit = u->hop_limit;
1200         p->encap_limit = u->encap_limit;
1201         p->flowinfo = u->flowinfo;
1202         p->link = u->link;
1203         p->i_key = u->i_key;
1204         p->o_key = u->o_key;
1205         p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1206         p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1207         memcpy(p->name, u->name, sizeof(u->name));
1208 }
1209
1210 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1211         const struct __ip6_tnl_parm *p)
1212 {
1213         u->proto = IPPROTO_GRE;
1214         u->laddr = p->laddr;
1215         u->raddr = p->raddr;
1216         u->flags = p->flags;
1217         u->hop_limit = p->hop_limit;
1218         u->encap_limit = p->encap_limit;
1219         u->flowinfo = p->flowinfo;
1220         u->link = p->link;
1221         u->i_key = p->i_key;
1222         u->o_key = p->o_key;
1223         u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1224         u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1225         memcpy(u->name, p->name, sizeof(u->name));
1226 }
1227
1228 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1229         struct ifreq *ifr, int cmd)
1230 {
1231         int err = 0;
1232         struct ip6_tnl_parm2 p;
1233         struct __ip6_tnl_parm p1;
1234         struct ip6_tnl *t = netdev_priv(dev);
1235         struct net *net = t->net;
1236         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1237
1238         memset(&p1, 0, sizeof(p1));
1239
1240         switch (cmd) {
1241         case SIOCGETTUNNEL:
1242                 if (dev == ign->fb_tunnel_dev) {
1243                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1244                                 err = -EFAULT;
1245                                 break;
1246                         }
1247                         ip6gre_tnl_parm_from_user(&p1, &p);
1248                         t = ip6gre_tunnel_locate(net, &p1, 0);
1249                         if (!t)
1250                                 t = netdev_priv(dev);
1251                 }
1252                 memset(&p, 0, sizeof(p));
1253                 ip6gre_tnl_parm_to_user(&p, &t->parms);
1254                 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1255                         err = -EFAULT;
1256                 break;
1257
1258         case SIOCADDTUNNEL:
1259         case SIOCCHGTUNNEL:
1260                 err = -EPERM;
1261                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1262                         goto done;
1263
1264                 err = -EFAULT;
1265                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1266                         goto done;
1267
1268                 err = -EINVAL;
1269                 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1270                         goto done;
1271
1272                 if (!(p.i_flags&GRE_KEY))
1273                         p.i_key = 0;
1274                 if (!(p.o_flags&GRE_KEY))
1275                         p.o_key = 0;
1276
1277                 ip6gre_tnl_parm_from_user(&p1, &p);
1278                 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1279
1280                 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1281                         if (t) {
1282                                 if (t->dev != dev) {
1283                                         err = -EEXIST;
1284                                         break;
1285                                 }
1286                         } else {
1287                                 t = netdev_priv(dev);
1288
1289                                 ip6gre_tunnel_unlink(ign, t);
1290                                 synchronize_net();
1291                                 ip6gre_tnl_change(t, &p1, 1);
1292                                 ip6gre_tunnel_link(ign, t);
1293                                 netdev_state_change(dev);
1294                         }
1295                 }
1296
1297                 if (t) {
1298                         err = 0;
1299
1300                         memset(&p, 0, sizeof(p));
1301                         ip6gre_tnl_parm_to_user(&p, &t->parms);
1302                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1303                                 err = -EFAULT;
1304                 } else
1305                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1306                 break;
1307
1308         case SIOCDELTUNNEL:
1309                 err = -EPERM;
1310                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1311                         goto done;
1312
1313                 if (dev == ign->fb_tunnel_dev) {
1314                         err = -EFAULT;
1315                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1316                                 goto done;
1317                         err = -ENOENT;
1318                         ip6gre_tnl_parm_from_user(&p1, &p);
1319                         t = ip6gre_tunnel_locate(net, &p1, 0);
1320                         if (!t)
1321                                 goto done;
1322                         err = -EPERM;
1323                         if (t == netdev_priv(ign->fb_tunnel_dev))
1324                                 goto done;
1325                         dev = t->dev;
1326                 }
1327                 unregister_netdevice(dev);
1328                 err = 0;
1329                 break;
1330
1331         default:
1332                 err = -EINVAL;
1333         }
1334
1335 done:
1336         return err;
1337 }
1338
1339 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1340                          unsigned short type, const void *daddr,
1341                          const void *saddr, unsigned int len)
1342 {
1343         struct ip6_tnl *t = netdev_priv(dev);
1344         struct ipv6hdr *ipv6h;
1345         __be16 *p;
1346
1347         ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1348         ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1349                                                   t->fl.u.ip6.flowlabel,
1350                                                   true, &t->fl.u.ip6));
1351         ipv6h->hop_limit = t->parms.hop_limit;
1352         ipv6h->nexthdr = NEXTHDR_GRE;
1353         ipv6h->saddr = t->parms.laddr;
1354         ipv6h->daddr = t->parms.raddr;
1355
1356         p = (__be16 *)(ipv6h + 1);
1357         p[0] = t->parms.o_flags;
1358         p[1] = htons(type);
1359
1360         /*
1361          *      Set the source hardware address.
1362          */
1363
1364         if (saddr)
1365                 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1366         if (daddr)
1367                 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1368         if (!ipv6_addr_any(&ipv6h->daddr))
1369                 return t->hlen;
1370
1371         return -t->hlen;
1372 }
1373
1374 static const struct header_ops ip6gre_header_ops = {
1375         .create = ip6gre_header,
1376 };
1377
1378 static const struct net_device_ops ip6gre_netdev_ops = {
1379         .ndo_init               = ip6gre_tunnel_init,
1380         .ndo_uninit             = ip6gre_tunnel_uninit,
1381         .ndo_start_xmit         = ip6gre_tunnel_xmit,
1382         .ndo_do_ioctl           = ip6gre_tunnel_ioctl,
1383         .ndo_change_mtu         = ip6_tnl_change_mtu,
1384         .ndo_get_stats64        = ip_tunnel_get_stats64,
1385         .ndo_get_iflink         = ip6_tnl_get_iflink,
1386 };
1387
1388 static void ip6gre_dev_free(struct net_device *dev)
1389 {
1390         struct ip6_tnl *t = netdev_priv(dev);
1391
1392         gro_cells_destroy(&t->gro_cells);
1393         dst_cache_destroy(&t->dst_cache);
1394         free_percpu(dev->tstats);
1395 }
1396
1397 static void ip6gre_tunnel_setup(struct net_device *dev)
1398 {
1399         dev->netdev_ops = &ip6gre_netdev_ops;
1400         dev->needs_free_netdev = true;
1401         dev->priv_destructor = ip6gre_dev_free;
1402
1403         dev->type = ARPHRD_IP6GRE;
1404
1405         dev->flags |= IFF_NOARP;
1406         dev->addr_len = sizeof(struct in6_addr);
1407         netif_keep_dst(dev);
1408         /* This perm addr will be used as interface identifier by IPv6 */
1409         dev->addr_assign_type = NET_ADDR_RANDOM;
1410         eth_random_addr(dev->perm_addr);
1411 }
1412
1413 #define GRE6_FEATURES (NETIF_F_SG |             \
1414                        NETIF_F_FRAGLIST |       \
1415                        NETIF_F_HIGHDMA |        \
1416                        NETIF_F_HW_CSUM)
1417
1418 static void ip6gre_tnl_init_features(struct net_device *dev)
1419 {
1420         struct ip6_tnl *nt = netdev_priv(dev);
1421
1422         dev->features           |= GRE6_FEATURES;
1423         dev->hw_features        |= GRE6_FEATURES;
1424
1425         if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1426                 /* TCP offload with GRE SEQ is not supported, nor
1427                  * can we support 2 levels of outer headers requiring
1428                  * an update.
1429                  */
1430                 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1431                     nt->encap.type == TUNNEL_ENCAP_NONE) {
1432                         dev->features    |= NETIF_F_GSO_SOFTWARE;
1433                         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1434                 }
1435
1436                 /* Can use a lockless transmit, unless we generate
1437                  * output sequences
1438                  */
1439                 dev->features |= NETIF_F_LLTX;
1440         }
1441 }
1442
1443 static int ip6gre_tunnel_init_common(struct net_device *dev)
1444 {
1445         struct ip6_tnl *tunnel;
1446         int ret;
1447         int t_hlen;
1448
1449         tunnel = netdev_priv(dev);
1450
1451         tunnel->dev = dev;
1452         tunnel->net = dev_net(dev);
1453         strcpy(tunnel->parms.name, dev->name);
1454
1455         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1456         if (!dev->tstats)
1457                 return -ENOMEM;
1458
1459         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1460         if (ret)
1461                 goto cleanup_alloc_pcpu_stats;
1462
1463         ret = gro_cells_init(&tunnel->gro_cells, dev);
1464         if (ret)
1465                 goto cleanup_dst_cache_init;
1466
1467         t_hlen = ip6gre_calc_hlen(tunnel);
1468         dev->mtu = ETH_DATA_LEN - t_hlen;
1469         if (dev->type == ARPHRD_ETHER)
1470                 dev->mtu -= ETH_HLEN;
1471         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1472                 dev->mtu -= 8;
1473
1474         if (tunnel->parms.collect_md) {
1475                 dev->features |= NETIF_F_NETNS_LOCAL;
1476                 netif_keep_dst(dev);
1477         }
1478         ip6gre_tnl_init_features(dev);
1479
1480         return 0;
1481
1482 cleanup_dst_cache_init:
1483         dst_cache_destroy(&tunnel->dst_cache);
1484 cleanup_alloc_pcpu_stats:
1485         free_percpu(dev->tstats);
1486         dev->tstats = NULL;
1487         return ret;
1488 }
1489
1490 static int ip6gre_tunnel_init(struct net_device *dev)
1491 {
1492         struct ip6_tnl *tunnel;
1493         int ret;
1494
1495         ret = ip6gre_tunnel_init_common(dev);
1496         if (ret)
1497                 return ret;
1498
1499         tunnel = netdev_priv(dev);
1500
1501         if (tunnel->parms.collect_md)
1502                 return 0;
1503
1504         memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1505         memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1506
1507         if (ipv6_addr_any(&tunnel->parms.raddr))
1508                 dev->header_ops = &ip6gre_header_ops;
1509
1510         return 0;
1511 }
1512
1513 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1514 {
1515         struct ip6_tnl *tunnel = netdev_priv(dev);
1516
1517         tunnel->dev = dev;
1518         tunnel->net = dev_net(dev);
1519         strcpy(tunnel->parms.name, dev->name);
1520
1521         tunnel->hlen            = sizeof(struct ipv6hdr) + 4;
1522
1523         dev_hold(dev);
1524 }
1525
1526 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1527         .handler     = gre_rcv,
1528         .err_handler = ip6gre_err,
1529         .flags       = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1530 };
1531
1532 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1533 {
1534         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1535         struct net_device *dev, *aux;
1536         int prio;
1537
1538         for_each_netdev_safe(net, dev, aux)
1539                 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1540                     dev->rtnl_link_ops == &ip6gre_tap_ops ||
1541                     dev->rtnl_link_ops == &ip6erspan_tap_ops)
1542                         unregister_netdevice_queue(dev, head);
1543
1544         for (prio = 0; prio < 4; prio++) {
1545                 int h;
1546                 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1547                         struct ip6_tnl *t;
1548
1549                         t = rtnl_dereference(ign->tunnels[prio][h]);
1550
1551                         while (t) {
1552                                 /* If dev is in the same netns, it has already
1553                                  * been added to the list by the previous loop.
1554                                  */
1555                                 if (!net_eq(dev_net(t->dev), net))
1556                                         unregister_netdevice_queue(t->dev,
1557                                                                    head);
1558                                 t = rtnl_dereference(t->next);
1559                         }
1560                 }
1561         }
1562 }
1563
1564 static int __net_init ip6gre_init_net(struct net *net)
1565 {
1566         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1567         int err;
1568
1569         if (!net_has_fallback_tunnels(net))
1570                 return 0;
1571         ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1572                                           NET_NAME_UNKNOWN,
1573                                           ip6gre_tunnel_setup);
1574         if (!ign->fb_tunnel_dev) {
1575                 err = -ENOMEM;
1576                 goto err_alloc_dev;
1577         }
1578         dev_net_set(ign->fb_tunnel_dev, net);
1579         /* FB netdevice is special: we have one, and only one per netns.
1580          * Allowing to move it to another netns is clearly unsafe.
1581          */
1582         ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1583
1584
1585         ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1586         ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1587
1588         err = register_netdev(ign->fb_tunnel_dev);
1589         if (err)
1590                 goto err_reg_dev;
1591
1592         rcu_assign_pointer(ign->tunnels_wc[0],
1593                            netdev_priv(ign->fb_tunnel_dev));
1594         return 0;
1595
1596 err_reg_dev:
1597         free_netdev(ign->fb_tunnel_dev);
1598 err_alloc_dev:
1599         return err;
1600 }
1601
1602 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1603 {
1604         struct net *net;
1605         LIST_HEAD(list);
1606
1607         rtnl_lock();
1608         list_for_each_entry(net, net_list, exit_list)
1609                 ip6gre_destroy_tunnels(net, &list);
1610         unregister_netdevice_many(&list);
1611         rtnl_unlock();
1612 }
1613
1614 static struct pernet_operations ip6gre_net_ops = {
1615         .init = ip6gre_init_net,
1616         .exit_batch = ip6gre_exit_batch_net,
1617         .id   = &ip6gre_net_id,
1618         .size = sizeof(struct ip6gre_net),
1619 };
1620
1621 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1622                                   struct netlink_ext_ack *extack)
1623 {
1624         __be16 flags;
1625
1626         if (!data)
1627                 return 0;
1628
1629         flags = 0;
1630         if (data[IFLA_GRE_IFLAGS])
1631                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1632         if (data[IFLA_GRE_OFLAGS])
1633                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1634         if (flags & (GRE_VERSION|GRE_ROUTING))
1635                 return -EINVAL;
1636
1637         return 0;
1638 }
1639
1640 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1641                                struct netlink_ext_ack *extack)
1642 {
1643         struct in6_addr daddr;
1644
1645         if (tb[IFLA_ADDRESS]) {
1646                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1647                         return -EINVAL;
1648                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1649                         return -EADDRNOTAVAIL;
1650         }
1651
1652         if (!data)
1653                 goto out;
1654
1655         if (data[IFLA_GRE_REMOTE]) {
1656                 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1657                 if (ipv6_addr_any(&daddr))
1658                         return -EINVAL;
1659         }
1660
1661 out:
1662         return ip6gre_tunnel_validate(tb, data, extack);
1663 }
1664
1665 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1666                                   struct netlink_ext_ack *extack)
1667 {
1668         __be16 flags = 0;
1669         int ret, ver = 0;
1670
1671         if (!data)
1672                 return 0;
1673
1674         ret = ip6gre_tap_validate(tb, data, extack);
1675         if (ret)
1676                 return ret;
1677
1678         /* ERSPAN should only have GRE sequence and key flag */
1679         if (data[IFLA_GRE_OFLAGS])
1680                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1681         if (data[IFLA_GRE_IFLAGS])
1682                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1683         if (!data[IFLA_GRE_COLLECT_METADATA] &&
1684             flags != (GRE_SEQ | GRE_KEY))
1685                 return -EINVAL;
1686
1687         /* ERSPAN Session ID only has 10-bit. Since we reuse
1688          * 32-bit key field as ID, check it's range.
1689          */
1690         if (data[IFLA_GRE_IKEY] &&
1691             (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1692                 return -EINVAL;
1693
1694         if (data[IFLA_GRE_OKEY] &&
1695             (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1696                 return -EINVAL;
1697
1698         if (data[IFLA_GRE_ERSPAN_VER]) {
1699                 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1700                 if (ver != 1 && ver != 2)
1701                         return -EINVAL;
1702         }
1703
1704         if (ver == 1) {
1705                 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1706                         u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1707
1708                         if (index & ~INDEX_MASK)
1709                                 return -EINVAL;
1710                 }
1711         } else if (ver == 2) {
1712                 if (data[IFLA_GRE_ERSPAN_DIR]) {
1713                         u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1714
1715                         if (dir & ~(DIR_MASK >> DIR_OFFSET))
1716                                 return -EINVAL;
1717                 }
1718
1719                 if (data[IFLA_GRE_ERSPAN_HWID]) {
1720                         u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1721
1722                         if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1723                                 return -EINVAL;
1724                 }
1725         }
1726
1727         return 0;
1728 }
1729
1730 static void ip6gre_netlink_parms(struct nlattr *data[],
1731                                 struct __ip6_tnl_parm *parms)
1732 {
1733         memset(parms, 0, sizeof(*parms));
1734
1735         if (!data)
1736                 return;
1737
1738         if (data[IFLA_GRE_LINK])
1739                 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1740
1741         if (data[IFLA_GRE_IFLAGS])
1742                 parms->i_flags = gre_flags_to_tnl_flags(
1743                                 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1744
1745         if (data[IFLA_GRE_OFLAGS])
1746                 parms->o_flags = gre_flags_to_tnl_flags(
1747                                 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1748
1749         if (data[IFLA_GRE_IKEY])
1750                 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1751
1752         if (data[IFLA_GRE_OKEY])
1753                 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1754
1755         if (data[IFLA_GRE_LOCAL])
1756                 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1757
1758         if (data[IFLA_GRE_REMOTE])
1759                 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1760
1761         if (data[IFLA_GRE_TTL])
1762                 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1763
1764         if (data[IFLA_GRE_ENCAP_LIMIT])
1765                 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1766
1767         if (data[IFLA_GRE_FLOWINFO])
1768                 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1769
1770         if (data[IFLA_GRE_FLAGS])
1771                 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1772
1773         if (data[IFLA_GRE_FWMARK])
1774                 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1775
1776         if (data[IFLA_GRE_COLLECT_METADATA])
1777                 parms->collect_md = true;
1778
1779         if (data[IFLA_GRE_ERSPAN_VER])
1780                 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1781
1782         if (parms->erspan_ver == 1) {
1783                 if (data[IFLA_GRE_ERSPAN_INDEX])
1784                         parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1785         } else if (parms->erspan_ver == 2) {
1786                 if (data[IFLA_GRE_ERSPAN_DIR])
1787                         parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1788                 if (data[IFLA_GRE_ERSPAN_HWID])
1789                         parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1790         }
1791 }
1792
1793 static int ip6gre_tap_init(struct net_device *dev)
1794 {
1795         int ret;
1796
1797         ret = ip6gre_tunnel_init_common(dev);
1798         if (ret)
1799                 return ret;
1800
1801         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1802
1803         return 0;
1804 }
1805
1806 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1807         .ndo_init = ip6gre_tap_init,
1808         .ndo_uninit = ip6gre_tunnel_uninit,
1809         .ndo_start_xmit = ip6gre_tunnel_xmit,
1810         .ndo_set_mac_address = eth_mac_addr,
1811         .ndo_validate_addr = eth_validate_addr,
1812         .ndo_change_mtu = ip6_tnl_change_mtu,
1813         .ndo_get_stats64 = ip_tunnel_get_stats64,
1814         .ndo_get_iflink = ip6_tnl_get_iflink,
1815 };
1816
1817 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1818 {
1819         int t_hlen;
1820
1821         tunnel->tun_hlen = 8;
1822         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1823                        erspan_hdr_len(tunnel->parms.erspan_ver);
1824
1825         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1826         tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1827         return t_hlen;
1828 }
1829
1830 static int ip6erspan_tap_init(struct net_device *dev)
1831 {
1832         struct ip6_tnl *tunnel;
1833         int t_hlen;
1834         int ret;
1835
1836         tunnel = netdev_priv(dev);
1837
1838         tunnel->dev = dev;
1839         tunnel->net = dev_net(dev);
1840         strcpy(tunnel->parms.name, dev->name);
1841
1842         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1843         if (!dev->tstats)
1844                 return -ENOMEM;
1845
1846         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1847         if (ret)
1848                 goto cleanup_alloc_pcpu_stats;
1849
1850         ret = gro_cells_init(&tunnel->gro_cells, dev);
1851         if (ret)
1852                 goto cleanup_dst_cache_init;
1853
1854         t_hlen = ip6erspan_calc_hlen(tunnel);
1855         dev->mtu = ETH_DATA_LEN - t_hlen;
1856         if (dev->type == ARPHRD_ETHER)
1857                 dev->mtu -= ETH_HLEN;
1858         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1859                 dev->mtu -= 8;
1860
1861         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1862         ip6erspan_tnl_link_config(tunnel, 1);
1863
1864         return 0;
1865
1866 cleanup_dst_cache_init:
1867         dst_cache_destroy(&tunnel->dst_cache);
1868 cleanup_alloc_pcpu_stats:
1869         free_percpu(dev->tstats);
1870         dev->tstats = NULL;
1871         return ret;
1872 }
1873
1874 static const struct net_device_ops ip6erspan_netdev_ops = {
1875         .ndo_init =             ip6erspan_tap_init,
1876         .ndo_uninit =           ip6erspan_tunnel_uninit,
1877         .ndo_start_xmit =       ip6erspan_tunnel_xmit,
1878         .ndo_set_mac_address =  eth_mac_addr,
1879         .ndo_validate_addr =    eth_validate_addr,
1880         .ndo_change_mtu =       ip6_tnl_change_mtu,
1881         .ndo_get_stats64 =      ip_tunnel_get_stats64,
1882         .ndo_get_iflink =       ip6_tnl_get_iflink,
1883 };
1884
1885 static void ip6gre_tap_setup(struct net_device *dev)
1886 {
1887
1888         ether_setup(dev);
1889
1890         dev->max_mtu = 0;
1891         dev->netdev_ops = &ip6gre_tap_netdev_ops;
1892         dev->needs_free_netdev = true;
1893         dev->priv_destructor = ip6gre_dev_free;
1894
1895         dev->features |= NETIF_F_NETNS_LOCAL;
1896         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1897         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1898         netif_keep_dst(dev);
1899 }
1900
1901 bool is_ip6gretap_dev(const struct net_device *dev)
1902 {
1903         return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1904 }
1905 EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1906
1907 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1908                                        struct ip_tunnel_encap *ipencap)
1909 {
1910         bool ret = false;
1911
1912         memset(ipencap, 0, sizeof(*ipencap));
1913
1914         if (!data)
1915                 return ret;
1916
1917         if (data[IFLA_GRE_ENCAP_TYPE]) {
1918                 ret = true;
1919                 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1920         }
1921
1922         if (data[IFLA_GRE_ENCAP_FLAGS]) {
1923                 ret = true;
1924                 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1925         }
1926
1927         if (data[IFLA_GRE_ENCAP_SPORT]) {
1928                 ret = true;
1929                 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1930         }
1931
1932         if (data[IFLA_GRE_ENCAP_DPORT]) {
1933                 ret = true;
1934                 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1935         }
1936
1937         return ret;
1938 }
1939
1940 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1941                                  struct nlattr *tb[], struct nlattr *data[],
1942                                  struct netlink_ext_ack *extack)
1943 {
1944         struct ip6_tnl *nt;
1945         struct ip_tunnel_encap ipencap;
1946         int err;
1947
1948         nt = netdev_priv(dev);
1949
1950         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1951                 int err = ip6_tnl_encap_setup(nt, &ipencap);
1952
1953                 if (err < 0)
1954                         return err;
1955         }
1956
1957         if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1958                 eth_hw_addr_random(dev);
1959
1960         nt->dev = dev;
1961         nt->net = dev_net(dev);
1962
1963         err = register_netdevice(dev);
1964         if (err)
1965                 goto out;
1966
1967         if (tb[IFLA_MTU])
1968                 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1969
1970         dev_hold(dev);
1971
1972 out:
1973         return err;
1974 }
1975
1976 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1977                           struct nlattr *tb[], struct nlattr *data[],
1978                           struct netlink_ext_ack *extack)
1979 {
1980         struct ip6_tnl *nt = netdev_priv(dev);
1981         struct net *net = dev_net(dev);
1982         struct ip6gre_net *ign;
1983         int err;
1984
1985         ip6gre_netlink_parms(data, &nt->parms);
1986         ign = net_generic(net, ip6gre_net_id);
1987
1988         if (nt->parms.collect_md) {
1989                 if (rtnl_dereference(ign->collect_md_tun))
1990                         return -EEXIST;
1991         } else {
1992                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1993                         return -EEXIST;
1994         }
1995
1996         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
1997         if (!err) {
1998                 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1999                 ip6gre_tunnel_link_md(ign, nt);
2000                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2001         }
2002         return err;
2003 }
2004
2005 static struct ip6_tnl *
2006 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2007                          struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2008                          struct netlink_ext_ack *extack)
2009 {
2010         struct ip6_tnl *t, *nt = netdev_priv(dev);
2011         struct net *net = nt->net;
2012         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2013         struct ip_tunnel_encap ipencap;
2014
2015         if (dev == ign->fb_tunnel_dev)
2016                 return ERR_PTR(-EINVAL);
2017
2018         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2019                 int err = ip6_tnl_encap_setup(nt, &ipencap);
2020
2021                 if (err < 0)
2022                         return ERR_PTR(err);
2023         }
2024
2025         ip6gre_netlink_parms(data, p_p);
2026
2027         t = ip6gre_tunnel_locate(net, p_p, 0);
2028
2029         if (t) {
2030                 if (t->dev != dev)
2031                         return ERR_PTR(-EEXIST);
2032         } else {
2033                 t = nt;
2034         }
2035
2036         return t;
2037 }
2038
2039 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2040                              struct nlattr *data[],
2041                              struct netlink_ext_ack *extack)
2042 {
2043         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2044         struct __ip6_tnl_parm p;
2045         struct ip6_tnl *t;
2046
2047         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2048         if (IS_ERR(t))
2049                 return PTR_ERR(t);
2050
2051         ip6gre_tunnel_unlink_md(ign, t);
2052         ip6gre_tunnel_unlink(ign, t);
2053         ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2054         ip6gre_tunnel_link_md(ign, t);
2055         ip6gre_tunnel_link(ign, t);
2056         return 0;
2057 }
2058
2059 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2060 {
2061         struct net *net = dev_net(dev);
2062         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2063
2064         if (dev != ign->fb_tunnel_dev)
2065                 unregister_netdevice_queue(dev, head);
2066 }
2067
2068 static size_t ip6gre_get_size(const struct net_device *dev)
2069 {
2070         return
2071                 /* IFLA_GRE_LINK */
2072                 nla_total_size(4) +
2073                 /* IFLA_GRE_IFLAGS */
2074                 nla_total_size(2) +
2075                 /* IFLA_GRE_OFLAGS */
2076                 nla_total_size(2) +
2077                 /* IFLA_GRE_IKEY */
2078                 nla_total_size(4) +
2079                 /* IFLA_GRE_OKEY */
2080                 nla_total_size(4) +
2081                 /* IFLA_GRE_LOCAL */
2082                 nla_total_size(sizeof(struct in6_addr)) +
2083                 /* IFLA_GRE_REMOTE */
2084                 nla_total_size(sizeof(struct in6_addr)) +
2085                 /* IFLA_GRE_TTL */
2086                 nla_total_size(1) +
2087                 /* IFLA_GRE_ENCAP_LIMIT */
2088                 nla_total_size(1) +
2089                 /* IFLA_GRE_FLOWINFO */
2090                 nla_total_size(4) +
2091                 /* IFLA_GRE_FLAGS */
2092                 nla_total_size(4) +
2093                 /* IFLA_GRE_ENCAP_TYPE */
2094                 nla_total_size(2) +
2095                 /* IFLA_GRE_ENCAP_FLAGS */
2096                 nla_total_size(2) +
2097                 /* IFLA_GRE_ENCAP_SPORT */
2098                 nla_total_size(2) +
2099                 /* IFLA_GRE_ENCAP_DPORT */
2100                 nla_total_size(2) +
2101                 /* IFLA_GRE_COLLECT_METADATA */
2102                 nla_total_size(0) +
2103                 /* IFLA_GRE_FWMARK */
2104                 nla_total_size(4) +
2105                 /* IFLA_GRE_ERSPAN_INDEX */
2106                 nla_total_size(4) +
2107                 0;
2108 }
2109
2110 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2111 {
2112         struct ip6_tnl *t = netdev_priv(dev);
2113         struct __ip6_tnl_parm *p = &t->parms;
2114
2115         if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2116             nla_put_be16(skb, IFLA_GRE_IFLAGS,
2117                          gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2118             nla_put_be16(skb, IFLA_GRE_OFLAGS,
2119                          gre_tnl_flags_to_gre_flags(p->o_flags)) ||
2120             nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2121             nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2122             nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2123             nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2124             nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2125             nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2126             nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2127             nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2128             nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
2129             nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2130                 goto nla_put_failure;
2131
2132         if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2133                         t->encap.type) ||
2134             nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2135                          t->encap.sport) ||
2136             nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2137                          t->encap.dport) ||
2138             nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2139                         t->encap.flags))
2140                 goto nla_put_failure;
2141
2142         if (p->collect_md) {
2143                 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2144                         goto nla_put_failure;
2145         }
2146
2147         if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2148                 goto nla_put_failure;
2149
2150         if (p->erspan_ver == 1) {
2151                 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2152                         goto nla_put_failure;
2153         } else if (p->erspan_ver == 2) {
2154                 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2155                         goto nla_put_failure;
2156                 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2157                         goto nla_put_failure;
2158         }
2159
2160         return 0;
2161
2162 nla_put_failure:
2163         return -EMSGSIZE;
2164 }
2165
2166 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2167         [IFLA_GRE_LINK]        = { .type = NLA_U32 },
2168         [IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2169         [IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2170         [IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2171         [IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2172         [IFLA_GRE_LOCAL]       = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2173         [IFLA_GRE_REMOTE]      = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2174         [IFLA_GRE_TTL]         = { .type = NLA_U8 },
2175         [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2176         [IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2177         [IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2178         [IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2179         [IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2180         [IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2181         [IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2182         [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2183         [IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2184         [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2185         [IFLA_GRE_ERSPAN_VER]   = { .type = NLA_U8 },
2186         [IFLA_GRE_ERSPAN_DIR]   = { .type = NLA_U8 },
2187         [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
2188 };
2189
2190 static void ip6erspan_tap_setup(struct net_device *dev)
2191 {
2192         ether_setup(dev);
2193
2194         dev->netdev_ops = &ip6erspan_netdev_ops;
2195         dev->needs_free_netdev = true;
2196         dev->priv_destructor = ip6gre_dev_free;
2197
2198         dev->features |= NETIF_F_NETNS_LOCAL;
2199         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2200         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2201         netif_keep_dst(dev);
2202 }
2203
2204 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2205                              struct nlattr *tb[], struct nlattr *data[],
2206                              struct netlink_ext_ack *extack)
2207 {
2208         struct ip6_tnl *nt = netdev_priv(dev);
2209         struct net *net = dev_net(dev);
2210         struct ip6gre_net *ign;
2211         int err;
2212
2213         ip6gre_netlink_parms(data, &nt->parms);
2214         ign = net_generic(net, ip6gre_net_id);
2215
2216         if (nt->parms.collect_md) {
2217                 if (rtnl_dereference(ign->collect_md_tun_erspan))
2218                         return -EEXIST;
2219         } else {
2220                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2221                         return -EEXIST;
2222         }
2223
2224         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2225         if (!err) {
2226                 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2227                 ip6erspan_tunnel_link_md(ign, nt);
2228                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2229         }
2230         return err;
2231 }
2232
2233 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2234 {
2235         ip6gre_tnl_link_config_common(t);
2236         ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2237 }
2238
2239 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2240                                 const struct __ip6_tnl_parm *p, int set_mtu)
2241 {
2242         ip6gre_tnl_copy_tnl_parm(t, p);
2243         ip6erspan_tnl_link_config(t, set_mtu);
2244         return 0;
2245 }
2246
2247 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2248                                 struct nlattr *data[],
2249                                 struct netlink_ext_ack *extack)
2250 {
2251         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2252         struct __ip6_tnl_parm p;
2253         struct ip6_tnl *t;
2254
2255         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2256         if (IS_ERR(t))
2257                 return PTR_ERR(t);
2258
2259         ip6gre_tunnel_unlink_md(ign, t);
2260         ip6gre_tunnel_unlink(ign, t);
2261         ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2262         ip6erspan_tunnel_link_md(ign, t);
2263         ip6gre_tunnel_link(ign, t);
2264         return 0;
2265 }
2266
2267 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2268         .kind           = "ip6gre",
2269         .maxtype        = IFLA_GRE_MAX,
2270         .policy         = ip6gre_policy,
2271         .priv_size      = sizeof(struct ip6_tnl),
2272         .setup          = ip6gre_tunnel_setup,
2273         .validate       = ip6gre_tunnel_validate,
2274         .newlink        = ip6gre_newlink,
2275         .changelink     = ip6gre_changelink,
2276         .dellink        = ip6gre_dellink,
2277         .get_size       = ip6gre_get_size,
2278         .fill_info      = ip6gre_fill_info,
2279         .get_link_net   = ip6_tnl_get_link_net,
2280 };
2281
2282 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2283         .kind           = "ip6gretap",
2284         .maxtype        = IFLA_GRE_MAX,
2285         .policy         = ip6gre_policy,
2286         .priv_size      = sizeof(struct ip6_tnl),
2287         .setup          = ip6gre_tap_setup,
2288         .validate       = ip6gre_tap_validate,
2289         .newlink        = ip6gre_newlink,
2290         .changelink     = ip6gre_changelink,
2291         .get_size       = ip6gre_get_size,
2292         .fill_info      = ip6gre_fill_info,
2293         .get_link_net   = ip6_tnl_get_link_net,
2294 };
2295
2296 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2297         .kind           = "ip6erspan",
2298         .maxtype        = IFLA_GRE_MAX,
2299         .policy         = ip6gre_policy,
2300         .priv_size      = sizeof(struct ip6_tnl),
2301         .setup          = ip6erspan_tap_setup,
2302         .validate       = ip6erspan_tap_validate,
2303         .newlink        = ip6erspan_newlink,
2304         .changelink     = ip6erspan_changelink,
2305         .get_size       = ip6gre_get_size,
2306         .fill_info      = ip6gre_fill_info,
2307         .get_link_net   = ip6_tnl_get_link_net,
2308 };
2309
2310 /*
2311  *      And now the modules code and kernel interface.
2312  */
2313
2314 static int __init ip6gre_init(void)
2315 {
2316         int err;
2317
2318         pr_info("GRE over IPv6 tunneling driver\n");
2319
2320         err = register_pernet_device(&ip6gre_net_ops);
2321         if (err < 0)
2322                 return err;
2323
2324         err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2325         if (err < 0) {
2326                 pr_info("%s: can't add protocol\n", __func__);
2327                 goto add_proto_failed;
2328         }
2329
2330         err = rtnl_link_register(&ip6gre_link_ops);
2331         if (err < 0)
2332                 goto rtnl_link_failed;
2333
2334         err = rtnl_link_register(&ip6gre_tap_ops);
2335         if (err < 0)
2336                 goto tap_ops_failed;
2337
2338         err = rtnl_link_register(&ip6erspan_tap_ops);
2339         if (err < 0)
2340                 goto erspan_link_failed;
2341
2342 out:
2343         return err;
2344
2345 erspan_link_failed:
2346         rtnl_link_unregister(&ip6gre_tap_ops);
2347 tap_ops_failed:
2348         rtnl_link_unregister(&ip6gre_link_ops);
2349 rtnl_link_failed:
2350         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2351 add_proto_failed:
2352         unregister_pernet_device(&ip6gre_net_ops);
2353         goto out;
2354 }
2355
2356 static void __exit ip6gre_fini(void)
2357 {
2358         rtnl_link_unregister(&ip6gre_tap_ops);
2359         rtnl_link_unregister(&ip6gre_link_ops);
2360         rtnl_link_unregister(&ip6erspan_tap_ops);
2361         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2362         unregister_pernet_device(&ip6gre_net_ops);
2363 }
2364
2365 module_init(ip6gre_init);
2366 module_exit(ip6gre_fini);
2367 MODULE_LICENSE("GPL");
2368 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2369 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2370 MODULE_ALIAS_RTNL_LINK("ip6gre");
2371 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2372 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2373 MODULE_ALIAS_NETDEV("ip6gre0");