net/ipv6/ip6_gre.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      GRE over IPv6 protocol decoder.
   4  *
   5  *      Authors: Dmitry Kozlov (xeb@mail.ru)
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/capability.h>
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/uaccess.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/in.h>
  19 #include <linux/tcp.h>
  20 #include <linux/udp.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/init.h>
  23 #include <linux/in6.h>
  24 #include <linux/inetdevice.h>
  25 #include <linux/igmp.h>
  26 #include <linux/netfilter_ipv4.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/if_ether.h>
  29 #include <linux/hash.h>
  30 #include <linux/if_tunnel.h>
  31 #include <linux/ip6_tunnel.h>
  32
  33 #include <net/sock.h>
  34 #include <net/ip.h>
  35 #include <net/ip_tunnels.h>
  36 #include <net/icmp.h>
  37 #include <net/protocol.h>
  38 #include <net/addrconf.h>
  39 #include <net/arp.h>
  40 #include <net/checksum.h>
  41 #include <net/dsfield.h>
  42 #include <net/inet_ecn.h>
  43 #include <net/xfrm.h>
  44 #include <net/net_namespace.h>
  45 #include <net/netns/generic.h>
  46 #include <net/rtnetlink.h>
  47
  48 #include <net/ipv6.h>
  49 #include <net/ip6_fib.h>
  50 #include <net/ip6_route.h>
  51 #include <net/ip6_tunnel.h>
  52 #include <net/gre.h>
  53 #include <net/erspan.h>
  54 #include <net/dst_metadata.h>
  55
  56
  57 static bool log_ecn_error = true;
  58 module_param(log_ecn_error, bool, 0644);
  59 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  60
  61 #define IP6_GRE_HASH_SIZE_SHIFT  5
  62 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
  63
  64 static unsigned int ip6gre_net_id __read_mostly;
  65 struct ip6gre_net {
  66         struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
  67
  68         struct ip6_tnl __rcu *collect_md_tun;
  69         struct ip6_tnl __rcu *collect_md_tun_erspan;
  70         struct net_device *fb_tunnel_dev;
  71 };
  72
  73 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
  74 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
  75 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
  76 static int ip6gre_tunnel_init(struct net_device *dev);
  77 static void ip6gre_tunnel_setup(struct net_device *dev);
  78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
  79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  80 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  81
  82 /* Tunnel hash table */
  83
  84 /*
  85    4 hash tables:
  86
  87    3: (remote,local)
  88    2: (remote,*)
  89    1: (*,local)
  90    0: (*,*)
  91
  92    We require exact key match i.e. if a key is present in packet
  93    it will match only tunnel with the same key; if it is not present,
  94    it will match only keyless tunnel.
  95
  96    All keysless packets, if not matched configured keyless tunnels
  97    will match fallback tunnel.
  98  */
  99
 100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
 101 static u32 HASH_ADDR(const struct in6_addr *addr)
 102 {
 103         u32 hash = ipv6_addr_hash(addr);
 104
 105         return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
 106 }
 107
 108 #define tunnels_r_l     tunnels[3]
 109 #define tunnels_r       tunnels[2]
 110 #define tunnels_l       tunnels[1]
 111 #define tunnels_wc      tunnels[0]
 112
 113 /* Given src, dst and key, find appropriate for input tunnel. */
 114
 115 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
 116                 const struct in6_addr *remote, const struct in6_addr *local,
 117                 __be32 key, __be16 gre_proto)
 118 {
 119         struct net *net = dev_net(dev);
 120         int link = dev->ifindex;
 121         unsigned int h0 = HASH_ADDR(remote);
 122         unsigned int h1 = HASH_KEY(key);
 123         struct ip6_tnl *t, *cand = NULL;
 124         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 125         int dev_type = (gre_proto == htons(ETH_P_TEB) ||
 126                         gre_proto == htons(ETH_P_ERSPAN) ||
 127                         gre_proto == htons(ETH_P_ERSPAN2)) ?
 128                        ARPHRD_ETHER : ARPHRD_IP6GRE;
 129         int score, cand_score = 4;
 130
 131         for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
 132                 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
 133                     !ipv6_addr_equal(remote, &t->parms.raddr) ||
 134                     key != t->parms.i_key ||
 135                     !(t->dev->flags & IFF_UP))
 136                         continue;
 137
 138                 if (t->dev->type != ARPHRD_IP6GRE &&
 139                     t->dev->type != dev_type)
 140                         continue;
 141
 142                 score = 0;
 143                 if (t->parms.link != link)
 144                         score |= 1;
 145                 if (t->dev->type != dev_type)
 146                         score |= 2;
 147                 if (score == 0)
 148                         return t;
 149
 150                 if (score < cand_score) {
 151                         cand = t;
 152                         cand_score = score;
 153                 }
 154         }
 155
 156         for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
 157                 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
 158                     key != t->parms.i_key ||
 159                     !(t->dev->flags & IFF_UP))
 160                         continue;
 161
 162                 if (t->dev->type != ARPHRD_IP6GRE &&
 163                     t->dev->type != dev_type)
 164                         continue;
 165
 166                 score = 0;
 167                 if (t->parms.link != link)
 168                         score |= 1;
 169                 if (t->dev->type != dev_type)
 170                         score |= 2;
 171                 if (score == 0)
 172                         return t;
 173
 174                 if (score < cand_score) {
 175                         cand = t;
 176                         cand_score = score;
 177                 }
 178         }
 179
 180         for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
 181                 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
 182                           (!ipv6_addr_equal(local, &t->parms.raddr) ||
 183                                  !ipv6_addr_is_multicast(local))) ||
 184                     key != t->parms.i_key ||
 185                     !(t->dev->flags & IFF_UP))
 186                         continue;
 187
 188                 if (t->dev->type != ARPHRD_IP6GRE &&
 189                     t->dev->type != dev_type)
 190                         continue;
 191
 192                 score = 0;
 193                 if (t->parms.link != link)
 194                         score |= 1;
 195                 if (t->dev->type != dev_type)
 196                         score |= 2;
 197                 if (score == 0)
 198                         return t;
 199
 200                 if (score < cand_score) {
 201                         cand = t;
 202                         cand_score = score;
 203                 }
 204         }
 205
 206         for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
 207                 if (t->parms.i_key != key ||
 208                     !(t->dev->flags & IFF_UP))
 209                         continue;
 210
 211                 if (t->dev->type != ARPHRD_IP6GRE &&
 212                     t->dev->type != dev_type)
 213                         continue;
 214
 215                 score = 0;
 216                 if (t->parms.link != link)
 217                         score |= 1;
 218                 if (t->dev->type != dev_type)
 219                         score |= 2;
 220                 if (score == 0)
 221                         return t;
 222
 223                 if (score < cand_score) {
 224                         cand = t;
 225                         cand_score = score;
 226                 }
 227         }
 228
 229         if (cand)
 230                 return cand;
 231
 232         if (gre_proto == htons(ETH_P_ERSPAN) ||
 233             gre_proto == htons(ETH_P_ERSPAN2))
 234                 t = rcu_dereference(ign->collect_md_tun_erspan);
 235         else
 236                 t = rcu_dereference(ign->collect_md_tun);
 237
 238         if (t && t->dev->flags & IFF_UP)
 239                 return t;
 240
 241         dev = ign->fb_tunnel_dev;
 242         if (dev && dev->flags & IFF_UP)
 243                 return netdev_priv(dev);
 244
 245         return NULL;
 246 }
 247
 248 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
 249                 const struct __ip6_tnl_parm *p)
 250 {
 251         const struct in6_addr *remote = &p->raddr;
 252         const struct in6_addr *local = &p->laddr;
 253         unsigned int h = HASH_KEY(p->i_key);
 254         int prio = 0;
 255
 256         if (!ipv6_addr_any(local))
 257                 prio |= 1;
 258         if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
 259                 prio |= 2;
 260                 h ^= HASH_ADDR(remote);
 261         }
 262
 263         return &ign->tunnels[prio][h];
 264 }
 265
 266 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 267 {
 268         if (t->parms.collect_md)
 269                 rcu_assign_pointer(ign->collect_md_tun, t);
 270 }
 271
 272 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 273 {
 274         if (t->parms.collect_md)
 275                 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
 276 }
 277
 278 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 279 {
 280         if (t->parms.collect_md)
 281                 rcu_assign_pointer(ign->collect_md_tun, NULL);
 282 }
 283
 284 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
 285                                        struct ip6_tnl *t)
 286 {
 287         if (t->parms.collect_md)
 288                 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
 289 }
 290
 291 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
 292                 const struct ip6_tnl *t)
 293 {
 294         return __ip6gre_bucket(ign, &t->parms);
 295 }
 296
 297 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
 298 {
 299         struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
 300
 301         rcu_assign_pointer(t->next, rtnl_dereference(*tp));
 302         rcu_assign_pointer(*tp, t);
 303 }
 304
 305 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
 306 {
 307         struct ip6_tnl __rcu **tp;
 308         struct ip6_tnl *iter;
 309
 310         for (tp = ip6gre_bucket(ign, t);
 311              (iter = rtnl_dereference(*tp)) != NULL;
 312              tp = &iter->next) {
 313                 if (t == iter) {
 314                         rcu_assign_pointer(*tp, t->next);
 315                         break;
 316                 }
 317         }
 318 }
 319
 320 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
 321                                            const struct __ip6_tnl_parm *parms,
 322                                            int type)
 323 {
 324         const struct in6_addr *remote = &parms->raddr;
 325         const struct in6_addr *local = &parms->laddr;
 326         __be32 key = parms->i_key;
 327         int link = parms->link;
 328         struct ip6_tnl *t;
 329         struct ip6_tnl __rcu **tp;
 330         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 331
 332         for (tp = __ip6gre_bucket(ign, parms);
 333              (t = rtnl_dereference(*tp)) != NULL;
 334              tp = &t->next)
 335                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
 336                     ipv6_addr_equal(remote, &t->parms.raddr) &&
 337                     key == t->parms.i_key &&
 338                     link == t->parms.link &&
 339                     type == t->dev->type)
 340                         break;
 341
 342         return t;
 343 }
 344
 345 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
 346                 const struct __ip6_tnl_parm *parms, int create)
 347 {
 348         struct ip6_tnl *t, *nt;
 349         struct net_device *dev;
 350         char name[IFNAMSIZ];
 351         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 352
 353         t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
 354         if (t && create)
 355                 return NULL;
 356         if (t || !create)
 357                 return t;
 358
 359         if (parms->name[0]) {
 360                 if (!dev_valid_name(parms->name))
 361                         return NULL;
 362                 strlcpy(name, parms->name, IFNAMSIZ);
 363         } else {
 364                 strcpy(name, "ip6gre%d");
 365         }
 366         dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
 367                            ip6gre_tunnel_setup);
 368         if (!dev)
 369                 return NULL;
 370
 371         dev_net_set(dev, net);
 372
 373         nt = netdev_priv(dev);
 374         nt->parms = *parms;
 375         dev->rtnl_link_ops = &ip6gre_link_ops;
 376
 377         nt->dev = dev;
 378         nt->net = dev_net(dev);
 379
 380         if (register_netdevice(dev) < 0)
 381                 goto failed_free;
 382
 383         ip6gre_tnl_link_config(nt, 1);
 384
 385         /* Can use a lockless transmit, unless we generate output sequences */
 386         if (!(nt->parms.o_flags & TUNNEL_SEQ))
 387                 dev->features |= NETIF_F_LLTX;
 388
 389         dev_hold(dev);
 390         ip6gre_tunnel_link(ign, nt);
 391         return nt;
 392
 393 failed_free:
 394         free_netdev(dev);
 395         return NULL;
 396 }
 397
 398 static void ip6erspan_tunnel_uninit(struct net_device *dev)
 399 {
 400         struct ip6_tnl *t = netdev_priv(dev);
 401         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 402
 403         ip6erspan_tunnel_unlink_md(ign, t);
 404         ip6gre_tunnel_unlink(ign, t);
 405         dst_cache_reset(&t->dst_cache);
 406         dev_put(dev);
 407 }
 408
 409 static void ip6gre_tunnel_uninit(struct net_device *dev)
 410 {
 411         struct ip6_tnl *t = netdev_priv(dev);
 412         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 413
 414         ip6gre_tunnel_unlink_md(ign, t);
 415         ip6gre_tunnel_unlink(ign, t);
 416         dst_cache_reset(&t->dst_cache);
 417         dev_put(dev);
 418 }
 419
 420
 421 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 422                        u8 type, u8 code, int offset, __be32 info)
 423 {
 424         struct net *net = dev_net(skb->dev);
 425         const struct ipv6hdr *ipv6h;
 426         struct tnl_ptk_info tpi;
 427         struct ip6_tnl *t;
 428
 429         if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
 430                              offset) < 0)
 431                 return -EINVAL;
 432
 433         ipv6h = (const struct ipv6hdr *)skb->data;
 434         t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
 435                                  tpi.key, tpi.proto);
 436         if (!t)
 437                 return -ENOENT;
 438
 439         switch (type) {
 440         case ICMPV6_DEST_UNREACH:
 441                 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
 442                                     t->parms.name);
 443                 if (code != ICMPV6_PORT_UNREACH)
 444                         break;
 445                 return 0;
 446         case ICMPV6_TIME_EXCEED:
 447                 if (code == ICMPV6_EXC_HOPLIMIT) {
 448                         net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
 449                                             t->parms.name);
 450                         break;
 451                 }
 452                 return 0;
 453         case ICMPV6_PARAMPROB: {
 454                 struct ipv6_tlv_tnl_enc_lim *tel;
 455                 __u32 teli;
 456
 457                 teli = 0;
 458                 if (code == ICMPV6_HDR_FIELD)
 459                         teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
 460
 461                 if (teli && teli == be32_to_cpu(info) - 2) {
 462                         tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
 463                         if (tel->encap_limit == 0) {
 464                                 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
 465                                                     t->parms.name);
 466                         }
 467                 } else {
 468                         net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
 469                                             t->parms.name);
 470                 }
 471                 return 0;
 472         }
 473         case ICMPV6_PKT_TOOBIG:
 474                 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
 475                 return 0;
 476         case NDISC_REDIRECT:
 477                 ip6_redirect(skb, net, skb->dev->ifindex, 0,
 478                              sock_net_uid(net, NULL));
 479                 return 0;
 480         }
 481
 482         if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
 483                 t->err_count++;
 484         else
 485                 t->err_count = 1;
 486         t->err_time = jiffies;
 487
 488         return 0;
 489 }
 490
 491 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
 492 {
 493         const struct ipv6hdr *ipv6h;
 494         struct ip6_tnl *tunnel;
 495
 496         ipv6h = ipv6_hdr(skb);
 497         tunnel = ip6gre_tunnel_lookup(skb->dev,
 498                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 499                                       tpi->proto);
 500         if (tunnel) {
 501                 if (tunnel->parms.collect_md) {
 502                         struct metadata_dst *tun_dst;
 503                         __be64 tun_id;
 504                         __be16 flags;
 505
 506                         flags = tpi->flags;
 507                         tun_id = key32_to_tunnel_id(tpi->key);
 508
 509                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
 510                         if (!tun_dst)
 511                                 return PACKET_REJECT;
 512
 513                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 514                 } else {
 515                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 516                 }
 517
 518                 return PACKET_RCVD;
 519         }
 520
 521         return PACKET_REJECT;
 522 }
 523
 524 static int ip6erspan_rcv(struct sk_buff *skb,
 525                          struct tnl_ptk_info *tpi,
 526                          int gre_hdr_len)
 527 {
 528         struct erspan_base_hdr *ershdr;
 529         const struct ipv6hdr *ipv6h;
 530         struct erspan_md2 *md2;
 531         struct ip6_tnl *tunnel;
 532         u8 ver;
 533
 534         ipv6h = ipv6_hdr(skb);
 535         ershdr = (struct erspan_base_hdr *)skb->data;
 536         ver = ershdr->ver;
 537
 538         tunnel = ip6gre_tunnel_lookup(skb->dev,
 539                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 540                                       tpi->proto);
 541         if (tunnel) {
 542                 int len = erspan_hdr_len(ver);
 543
 544                 if (unlikely(!pskb_may_pull(skb, len)))
 545                         return PACKET_REJECT;
 546
 547                 if (__iptunnel_pull_header(skb, len,
 548                                            htons(ETH_P_TEB),
 549                                            false, false) < 0)
 550                         return PACKET_REJECT;
 551
 552                 if (tunnel->parms.collect_md) {
 553                         struct erspan_metadata *pkt_md, *md;
 554                         struct metadata_dst *tun_dst;
 555                         struct ip_tunnel_info *info;
 556                         unsigned char *gh;
 557                         __be64 tun_id;
 558                         __be16 flags;
 559
 560                         tpi->flags |= TUNNEL_KEY;
 561                         flags = tpi->flags;
 562                         tun_id = key32_to_tunnel_id(tpi->key);
 563
 564                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
 565                                                   sizeof(*md));
 566                         if (!tun_dst)
 567                                 return PACKET_REJECT;
 568
 569                         /* skb can be uncloned in __iptunnel_pull_header, so
 570                          * old pkt_md is no longer valid and we need to reset
 571                          * it
 572                          */
 573                         gh = skb_network_header(skb) +
 574                              skb_network_header_len(skb);
 575                         pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
 576                                                             sizeof(*ershdr));
 577                         info = &tun_dst->u.tun_info;
 578                         md = ip_tunnel_info_opts(info);
 579                         md->version = ver;
 580                         md2 = &md->u.md2;
 581                         memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
 582                                                        ERSPAN_V2_MDSIZE);
 583                         info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
 584                         info->options_len = sizeof(*md);
 585
 586                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 587
 588                 } else {
 589                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 590                 }
 591
 592                 return PACKET_RCVD;
 593         }
 594
 595         return PACKET_REJECT;
 596 }
 597
 598 static int gre_rcv(struct sk_buff *skb)
 599 {
 600         struct tnl_ptk_info tpi;
 601         bool csum_err = false;
 602         int hdr_len;
 603
 604         hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
 605         if (hdr_len < 0)
 606                 goto drop;
 607
 608         if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 609                 goto drop;
 610
 611         if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
 612                      tpi.proto == htons(ETH_P_ERSPAN2))) {
 613                 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
 614                         return 0;
 615                 goto out;
 616         }
 617
 618         if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 619                 return 0;
 620
 621 out:
 622         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 623 drop:
 624         kfree_skb(skb);
 625         return 0;
 626 }
 627
 628 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 629 {
 630         return iptunnel_handle_offloads(skb,
 631                                         csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 632 }
 633
 634 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
 635                                      struct net_device *dev,
 636                                      struct flowi6 *fl6, __u8 *dsfield,
 637                                      int *encap_limit)
 638 {
 639         const struct iphdr *iph = ip_hdr(skb);
 640         struct ip6_tnl *t = netdev_priv(dev);
 641
 642         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 643                 *encap_limit = t->parms.encap_limit;
 644
 645         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 646
 647         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 648                 *dsfield = ipv4_get_dsfield(iph);
 649         else
 650                 *dsfield = ip6_tclass(t->parms.flowinfo);
 651
 652         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 653                 fl6->flowi6_mark = skb->mark;
 654         else
 655                 fl6->flowi6_mark = t->parms.fwmark;
 656
 657         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 658 }
 659
 660 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
 661                                     struct net_device *dev,
 662                                     struct flowi6 *fl6, __u8 *dsfield,
 663                                     int *encap_limit)
 664 {
 665         struct ipv6hdr *ipv6h;
 666         struct ip6_tnl *t = netdev_priv(dev);
 667         __u16 offset;
 668
 669         offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
 670         /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
 671         ipv6h = ipv6_hdr(skb);
 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         __be16 proto;
 926         __u32 mtu;
 927         int nhoff;
 928         int thoff;
 929
 930         if (!pskb_inet_may_pull(skb))
 931                 goto tx_err;
 932
 933         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 934                 goto tx_err;
 935
 936         if (gre_handle_offloads(skb, false))
 937                 goto tx_err;
 938
 939         if (skb->len > dev->mtu + dev->hard_header_len) {
 940                 pskb_trim(skb, dev->mtu + dev->hard_header_len);
 941                 truncate = true;
 942         }
 943
 944         nhoff = skb_network_header(skb) - skb_mac_header(skb);
 945         if (skb->protocol == htons(ETH_P_IP) &&
 946             (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
 947                 truncate = true;
 948
 949         thoff = skb_transport_header(skb) - skb_mac_header(skb);
 950         if (skb->protocol == htons(ETH_P_IPV6) &&
 951             (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
 952                 truncate = true;
 953
 954         if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
 955                 goto tx_err;
 956
 957         t->parms.o_flags &= ~TUNNEL_KEY;
 958         IPCB(skb)->flags = 0;
 959
 960         /* For collect_md mode, derive fl6 from the tunnel key,
 961          * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
 962          */
 963         if (t->parms.collect_md) {
 964                 struct ip_tunnel_info *tun_info;
 965                 const struct ip_tunnel_key *key;
 966                 struct erspan_metadata *md;
 967                 __be32 tun_id;
 968
 969                 tun_info = skb_tunnel_info(skb);
 970                 if (unlikely(!tun_info ||
 971                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
 972                              ip_tunnel_info_af(tun_info) != AF_INET6))
 973                         goto tx_err;
 974
 975                 key = &tun_info->key;
 976                 memset(&fl6, 0, sizeof(fl6));
 977                 fl6.flowi6_proto = IPPROTO_GRE;
 978                 fl6.daddr = key->u.ipv6.dst;
 979                 fl6.flowlabel = key->label;
 980                 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 981
 982                 dsfield = key->tos;
 983                 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
 984                         goto tx_err;
 985                 if (tun_info->options_len < sizeof(*md))
 986                         goto tx_err;
 987                 md = ip_tunnel_info_opts(tun_info);
 988
 989                 tun_id = tunnel_id_to_key32(key->tun_id);
 990                 if (md->version == 1) {
 991                         erspan_build_header(skb,
 992                                             ntohl(tun_id),
 993                                             ntohl(md->u.index), truncate,
 994                                             false);
 995                 } else if (md->version == 2) {
 996                         erspan_build_header_v2(skb,
 997                                                ntohl(tun_id),
 998                                                md->u.md2.dir,
 999                                                get_hwid(&md->u.md2),
1000                                                truncate, false);
1001                 } else {
1002                         goto tx_err;
1003                 }
1004         } else {
1005                 switch (skb->protocol) {
1006                 case htons(ETH_P_IP):
1007                         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1008                         prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1009                                                  &dsfield, &encap_limit);
1010                         break;
1011                 case htons(ETH_P_IPV6):
1012                         if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1013                                 goto tx_err;
1014                         if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1015                                                      &dsfield, &encap_limit))
1016                                 goto tx_err;
1017                         break;
1018                 default:
1019                         memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1020                         break;
1021                 }
1022
1023                 if (t->parms.erspan_ver == 1)
1024                         erspan_build_header(skb, ntohl(t->parms.o_key),
1025                                             t->parms.index,
1026                                             truncate, false);
1027                 else if (t->parms.erspan_ver == 2)
1028                         erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1029                                                t->parms.dir,
1030                                                t->parms.hwid,
1031                                                truncate, false);
1032                 else
1033                         goto tx_err;
1034
1035                 fl6.daddr = t->parms.raddr;
1036         }
1037
1038         /* Push GRE header. */
1039         proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1040                                            : htons(ETH_P_ERSPAN2);
1041         gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));
1042
1043         /* TooBig packet may have updated dst->dev's mtu */
1044         if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1045                 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1046
1047         err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1048                            NEXTHDR_GRE);
1049         if (err != 0) {
1050                 /* XXX: send ICMP error even if DF is not set. */
1051                 if (err == -EMSGSIZE) {
1052                         if (skb->protocol == htons(ETH_P_IP))
1053                                 icmp_send(skb, ICMP_DEST_UNREACH,
1054                                           ICMP_FRAG_NEEDED, htonl(mtu));
1055                         else
1056                                 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1057                 }
1058
1059                 goto tx_err;
1060         }
1061         return NETDEV_TX_OK;
1062
1063 tx_err:
1064         stats = &t->dev->stats;
1065         stats->tx_errors++;
1066         stats->tx_dropped++;
1067         kfree_skb(skb);
1068         return NETDEV_TX_OK;
1069 }
1070
1071 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1072 {
1073         struct net_device *dev = t->dev;
1074         struct __ip6_tnl_parm *p = &t->parms;
1075         struct flowi6 *fl6 = &t->fl.u.ip6;
1076
1077         if (dev->type != ARPHRD_ETHER) {
1078                 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1079                 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1080         }
1081
1082         /* Set up flowi template */
1083         fl6->saddr = p->laddr;
1084         fl6->daddr = p->raddr;
1085         fl6->flowi6_oif = p->link;
1086         fl6->flowlabel = 0;
1087         fl6->flowi6_proto = IPPROTO_GRE;
1088
1089         if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1090                 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1091         if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1092                 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1093
1094         p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1095         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1096
1097         if (p->flags&IP6_TNL_F_CAP_XMIT &&
1098                         p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1099                 dev->flags |= IFF_POINTOPOINT;
1100         else
1101                 dev->flags &= ~IFF_POINTOPOINT;
1102 }
1103
1104 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1105                                          int t_hlen)
1106 {
1107         const struct __ip6_tnl_parm *p = &t->parms;
1108         struct net_device *dev = t->dev;
1109
1110         if (p->flags & IP6_TNL_F_CAP_XMIT) {
1111                 int strict = (ipv6_addr_type(&p->raddr) &
1112                               (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1113
1114                 struct rt6_info *rt = rt6_lookup(t->net,
1115                                                  &p->raddr, &p->laddr,
1116                                                  p->link, NULL, strict);
1117
1118                 if (!rt)
1119                         return;
1120
1121                 if (rt->dst.dev) {
1122                         dev->needed_headroom = rt->dst.dev->hard_header_len +
1123                                                t_hlen;
1124
1125                         if (set_mtu) {
1126                                 dev->mtu = rt->dst.dev->mtu - t_hlen;
1127                                 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1128                                         dev->mtu -= 8;
1129                                 if (dev->type == ARPHRD_ETHER)
1130                                         dev->mtu -= ETH_HLEN;
1131
1132                                 if (dev->mtu < IPV6_MIN_MTU)
1133                                         dev->mtu = IPV6_MIN_MTU;
1134                         }
1135                 }
1136                 ip6_rt_put(rt);
1137         }
1138 }
1139
1140 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1141 {
1142         int t_hlen;
1143
1144         tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1145         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1146
1147         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1148         tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1149         return t_hlen;
1150 }
1151
1152 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1153 {
1154         ip6gre_tnl_link_config_common(t);
1155         ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1156 }
1157
1158 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1159                                      const struct __ip6_tnl_parm *p)
1160 {
1161         t->parms.laddr = p->laddr;
1162         t->parms.raddr = p->raddr;
1163         t->parms.flags = p->flags;
1164         t->parms.hop_limit = p->hop_limit;
1165         t->parms.encap_limit = p->encap_limit;
1166         t->parms.flowinfo = p->flowinfo;
1167         t->parms.link = p->link;
1168         t->parms.proto = p->proto;
1169         t->parms.i_key = p->i_key;
1170         t->parms.o_key = p->o_key;
1171         t->parms.i_flags = p->i_flags;
1172         t->parms.o_flags = p->o_flags;
1173         t->parms.fwmark = p->fwmark;
1174         t->parms.erspan_ver = p->erspan_ver;
1175         t->parms.index = p->index;
1176         t->parms.dir = p->dir;
1177         t->parms.hwid = p->hwid;
1178         dst_cache_reset(&t->dst_cache);
1179 }
1180
1181 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1182                              int set_mtu)
1183 {
1184         ip6gre_tnl_copy_tnl_parm(t, p);
1185         ip6gre_tnl_link_config(t, set_mtu);
1186         return 0;
1187 }
1188
1189 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1190         const struct ip6_tnl_parm2 *u)
1191 {
1192         p->laddr = u->laddr;
1193         p->raddr = u->raddr;
1194         p->flags = u->flags;
1195         p->hop_limit = u->hop_limit;
1196         p->encap_limit = u->encap_limit;
1197         p->flowinfo = u->flowinfo;
1198         p->link = u->link;
1199         p->i_key = u->i_key;
1200         p->o_key = u->o_key;
1201         p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1202         p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1203         memcpy(p->name, u->name, sizeof(u->name));
1204 }
1205
1206 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1207         const struct __ip6_tnl_parm *p)
1208 {
1209         u->proto = IPPROTO_GRE;
1210         u->laddr = p->laddr;
1211         u->raddr = p->raddr;
1212         u->flags = p->flags;
1213         u->hop_limit = p->hop_limit;
1214         u->encap_limit = p->encap_limit;
1215         u->flowinfo = p->flowinfo;
1216         u->link = p->link;
1217         u->i_key = p->i_key;
1218         u->o_key = p->o_key;
1219         u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1220         u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1221         memcpy(u->name, p->name, sizeof(u->name));
1222 }
1223
1224 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1225         struct ifreq *ifr, int cmd)
1226 {
1227         int err = 0;
1228         struct ip6_tnl_parm2 p;
1229         struct __ip6_tnl_parm p1;
1230         struct ip6_tnl *t = netdev_priv(dev);
1231         struct net *net = t->net;
1232         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1233
1234         memset(&p1, 0, sizeof(p1));
1235
1236         switch (cmd) {
1237         case SIOCGETTUNNEL:
1238                 if (dev == ign->fb_tunnel_dev) {
1239                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1240                                 err = -EFAULT;
1241                                 break;
1242                         }
1243                         ip6gre_tnl_parm_from_user(&p1, &p);
1244                         t = ip6gre_tunnel_locate(net, &p1, 0);
1245                         if (!t)
1246                                 t = netdev_priv(dev);
1247                 }
1248                 memset(&p, 0, sizeof(p));
1249                 ip6gre_tnl_parm_to_user(&p, &t->parms);
1250                 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1251                         err = -EFAULT;
1252                 break;
1253
1254         case SIOCADDTUNNEL:
1255         case SIOCCHGTUNNEL:
1256                 err = -EPERM;
1257                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1258                         goto done;
1259
1260                 err = -EFAULT;
1261                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1262                         goto done;
1263
1264                 err = -EINVAL;
1265                 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1266                         goto done;
1267
1268                 if (!(p.i_flags&GRE_KEY))
1269                         p.i_key = 0;
1270                 if (!(p.o_flags&GRE_KEY))
1271                         p.o_key = 0;
1272
1273                 ip6gre_tnl_parm_from_user(&p1, &p);
1274                 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1275
1276                 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1277                         if (t) {
1278                                 if (t->dev != dev) {
1279                                         err = -EEXIST;
1280                                         break;
1281                                 }
1282                         } else {
1283                                 t = netdev_priv(dev);
1284
1285                                 ip6gre_tunnel_unlink(ign, t);
1286                                 synchronize_net();
1287                                 ip6gre_tnl_change(t, &p1, 1);
1288                                 ip6gre_tunnel_link(ign, t);
1289                                 netdev_state_change(dev);
1290                         }
1291                 }
1292
1293                 if (t) {
1294                         err = 0;
1295
1296                         memset(&p, 0, sizeof(p));
1297                         ip6gre_tnl_parm_to_user(&p, &t->parms);
1298                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1299                                 err = -EFAULT;
1300                 } else
1301                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1302                 break;
1303
1304         case SIOCDELTUNNEL:
1305                 err = -EPERM;
1306                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1307                         goto done;
1308
1309                 if (dev == ign->fb_tunnel_dev) {
1310                         err = -EFAULT;
1311                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1312                                 goto done;
1313                         err = -ENOENT;
1314                         ip6gre_tnl_parm_from_user(&p1, &p);
1315                         t = ip6gre_tunnel_locate(net, &p1, 0);
1316                         if (!t)
1317                                 goto done;
1318                         err = -EPERM;
1319                         if (t == netdev_priv(ign->fb_tunnel_dev))
1320                                 goto done;
1321                         dev = t->dev;
1322                 }
1323                 unregister_netdevice(dev);
1324                 err = 0;
1325                 break;
1326
1327         default:
1328                 err = -EINVAL;
1329         }
1330
1331 done:
1332         return err;
1333 }
1334
1335 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1336                          unsigned short type, const void *daddr,
1337                          const void *saddr, unsigned int len)
1338 {
1339         struct ip6_tnl *t = netdev_priv(dev);
1340         struct ipv6hdr *ipv6h;
1341         __be16 *p;
1342
1343         ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1344         ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1345                                                   t->fl.u.ip6.flowlabel,
1346                                                   true, &t->fl.u.ip6));
1347         ipv6h->hop_limit = t->parms.hop_limit;
1348         ipv6h->nexthdr = NEXTHDR_GRE;
1349         ipv6h->saddr = t->parms.laddr;
1350         ipv6h->daddr = t->parms.raddr;
1351
1352         p = (__be16 *)(ipv6h + 1);
1353         p[0] = t->parms.o_flags;
1354         p[1] = htons(type);
1355
1356         /*
1357          *      Set the source hardware address.
1358          */
1359
1360         if (saddr)
1361                 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1362         if (daddr)
1363                 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1364         if (!ipv6_addr_any(&ipv6h->daddr))
1365                 return t->hlen;
1366
1367         return -t->hlen;
1368 }
1369
1370 static const struct header_ops ip6gre_header_ops = {
1371         .create = ip6gre_header,
1372 };
1373
1374 static const struct net_device_ops ip6gre_netdev_ops = {
1375         .ndo_init               = ip6gre_tunnel_init,
1376         .ndo_uninit             = ip6gre_tunnel_uninit,
1377         .ndo_start_xmit         = ip6gre_tunnel_xmit,
1378         .ndo_do_ioctl           = ip6gre_tunnel_ioctl,
1379         .ndo_change_mtu         = ip6_tnl_change_mtu,
1380         .ndo_get_stats64        = ip_tunnel_get_stats64,
1381         .ndo_get_iflink         = ip6_tnl_get_iflink,
1382 };
1383
1384 static void ip6gre_dev_free(struct net_device *dev)
1385 {
1386         struct ip6_tnl *t = netdev_priv(dev);
1387
1388         gro_cells_destroy(&t->gro_cells);
1389         dst_cache_destroy(&t->dst_cache);
1390         free_percpu(dev->tstats);
1391 }
1392
1393 static void ip6gre_tunnel_setup(struct net_device *dev)
1394 {
1395         dev->netdev_ops = &ip6gre_netdev_ops;
1396         dev->needs_free_netdev = true;
1397         dev->priv_destructor = ip6gre_dev_free;
1398
1399         dev->type = ARPHRD_IP6GRE;
1400
1401         dev->flags |= IFF_NOARP;
1402         dev->addr_len = sizeof(struct in6_addr);
1403         netif_keep_dst(dev);
1404         /* This perm addr will be used as interface identifier by IPv6 */
1405         dev->addr_assign_type = NET_ADDR_RANDOM;
1406         eth_random_addr(dev->perm_addr);
1407 }
1408
1409 #define GRE6_FEATURES (NETIF_F_SG |             \
1410                        NETIF_F_FRAGLIST |       \
1411                        NETIF_F_HIGHDMA |        \
1412                        NETIF_F_HW_CSUM)
1413
1414 static void ip6gre_tnl_init_features(struct net_device *dev)
1415 {
1416         struct ip6_tnl *nt = netdev_priv(dev);
1417
1418         dev->features           |= GRE6_FEATURES;
1419         dev->hw_features        |= GRE6_FEATURES;
1420
1421         if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1422                 /* TCP offload with GRE SEQ is not supported, nor
1423                  * can we support 2 levels of outer headers requiring
1424                  * an update.
1425                  */
1426                 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1427                     nt->encap.type == TUNNEL_ENCAP_NONE) {
1428                         dev->features    |= NETIF_F_GSO_SOFTWARE;
1429                         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1430                 }
1431
1432                 /* Can use a lockless transmit, unless we generate
1433                  * output sequences
1434                  */
1435                 dev->features |= NETIF_F_LLTX;
1436         }
1437 }
1438
1439 static int ip6gre_tunnel_init_common(struct net_device *dev)
1440 {
1441         struct ip6_tnl *tunnel;
1442         int ret;
1443         int t_hlen;
1444
1445         tunnel = netdev_priv(dev);
1446
1447         tunnel->dev = dev;
1448         tunnel->net = dev_net(dev);
1449         strcpy(tunnel->parms.name, dev->name);
1450
1451         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1452         if (!dev->tstats)
1453                 return -ENOMEM;
1454
1455         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1456         if (ret)
1457                 goto cleanup_alloc_pcpu_stats;
1458
1459         ret = gro_cells_init(&tunnel->gro_cells, dev);
1460         if (ret)
1461                 goto cleanup_dst_cache_init;
1462
1463         t_hlen = ip6gre_calc_hlen(tunnel);
1464         dev->mtu = ETH_DATA_LEN - t_hlen;
1465         if (dev->type == ARPHRD_ETHER)
1466                 dev->mtu -= ETH_HLEN;
1467         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1468                 dev->mtu -= 8;
1469
1470         if (tunnel->parms.collect_md) {
1471                 netif_keep_dst(dev);
1472         }
1473         ip6gre_tnl_init_features(dev);
1474
1475         return 0;
1476
1477 cleanup_dst_cache_init:
1478         dst_cache_destroy(&tunnel->dst_cache);
1479 cleanup_alloc_pcpu_stats:
1480         free_percpu(dev->tstats);
1481         dev->tstats = NULL;
1482         return ret;
1483 }
1484
1485 static int ip6gre_tunnel_init(struct net_device *dev)
1486 {
1487         struct ip6_tnl *tunnel;
1488         int ret;
1489
1490         ret = ip6gre_tunnel_init_common(dev);
1491         if (ret)
1492                 return ret;
1493
1494         tunnel = netdev_priv(dev);
1495
1496         if (tunnel->parms.collect_md)
1497                 return 0;
1498
1499         memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1500         memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1501
1502         if (ipv6_addr_any(&tunnel->parms.raddr))
1503                 dev->header_ops = &ip6gre_header_ops;
1504
1505         return 0;
1506 }
1507
1508 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1509 {
1510         struct ip6_tnl *tunnel = netdev_priv(dev);
1511
1512         tunnel->dev = dev;
1513         tunnel->net = dev_net(dev);
1514         strcpy(tunnel->parms.name, dev->name);
1515
1516         tunnel->hlen            = sizeof(struct ipv6hdr) + 4;
1517
1518         dev_hold(dev);
1519 }
1520
1521 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1522         .handler     = gre_rcv,
1523         .err_handler = ip6gre_err,
1524         .flags       = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1525 };
1526
1527 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1528 {
1529         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1530         struct net_device *dev, *aux;
1531         int prio;
1532
1533         for_each_netdev_safe(net, dev, aux)
1534                 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1535                     dev->rtnl_link_ops == &ip6gre_tap_ops ||
1536                     dev->rtnl_link_ops == &ip6erspan_tap_ops)
1537                         unregister_netdevice_queue(dev, head);
1538
1539         for (prio = 0; prio < 4; prio++) {
1540                 int h;
1541                 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1542                         struct ip6_tnl *t;
1543
1544                         t = rtnl_dereference(ign->tunnels[prio][h]);
1545
1546                         while (t) {
1547                                 /* If dev is in the same netns, it has already
1548                                  * been added to the list by the previous loop.
1549                                  */
1550                                 if (!net_eq(dev_net(t->dev), net))
1551                                         unregister_netdevice_queue(t->dev,
1552                                                                    head);
1553                                 t = rtnl_dereference(t->next);
1554                         }
1555                 }
1556         }
1557 }
1558
1559 static int __net_init ip6gre_init_net(struct net *net)
1560 {
1561         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1562         int err;
1563
1564         if (!net_has_fallback_tunnels(net))
1565                 return 0;
1566         ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1567                                           NET_NAME_UNKNOWN,
1568                                           ip6gre_tunnel_setup);
1569         if (!ign->fb_tunnel_dev) {
1570                 err = -ENOMEM;
1571                 goto err_alloc_dev;
1572         }
1573         dev_net_set(ign->fb_tunnel_dev, net);
1574         /* FB netdevice is special: we have one, and only one per netns.
1575          * Allowing to move it to another netns is clearly unsafe.
1576          */
1577         ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1578
1579
1580         ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1581         ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1582
1583         err = register_netdev(ign->fb_tunnel_dev);
1584         if (err)
1585                 goto err_reg_dev;
1586
1587         rcu_assign_pointer(ign->tunnels_wc[0],
1588                            netdev_priv(ign->fb_tunnel_dev));
1589         return 0;
1590
1591 err_reg_dev:
1592         free_netdev(ign->fb_tunnel_dev);
1593 err_alloc_dev:
1594         return err;
1595 }
1596
1597 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1598 {
1599         struct net *net;
1600         LIST_HEAD(list);
1601
1602         rtnl_lock();
1603         list_for_each_entry(net, net_list, exit_list)
1604                 ip6gre_destroy_tunnels(net, &list);
1605         unregister_netdevice_many(&list);
1606         rtnl_unlock();
1607 }
1608
1609 static struct pernet_operations ip6gre_net_ops = {
1610         .init = ip6gre_init_net,
1611         .exit_batch = ip6gre_exit_batch_net,
1612         .id   = &ip6gre_net_id,
1613         .size = sizeof(struct ip6gre_net),
1614 };
1615
1616 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1617                                   struct netlink_ext_ack *extack)
1618 {
1619         __be16 flags;
1620
1621         if (!data)
1622                 return 0;
1623
1624         flags = 0;
1625         if (data[IFLA_GRE_IFLAGS])
1626                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1627         if (data[IFLA_GRE_OFLAGS])
1628                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1629         if (flags & (GRE_VERSION|GRE_ROUTING))
1630                 return -EINVAL;
1631
1632         return 0;
1633 }
1634
1635 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1636                                struct netlink_ext_ack *extack)
1637 {
1638         struct in6_addr daddr;
1639
1640         if (tb[IFLA_ADDRESS]) {
1641                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1642                         return -EINVAL;
1643                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1644                         return -EADDRNOTAVAIL;
1645         }
1646
1647         if (!data)
1648                 goto out;
1649
1650         if (data[IFLA_GRE_REMOTE]) {
1651                 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1652                 if (ipv6_addr_any(&daddr))
1653                         return -EINVAL;
1654         }
1655
1656 out:
1657         return ip6gre_tunnel_validate(tb, data, extack);
1658 }
1659
1660 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1661                                   struct netlink_ext_ack *extack)
1662 {
1663         __be16 flags = 0;
1664         int ret, ver = 0;
1665
1666         if (!data)
1667                 return 0;
1668
1669         ret = ip6gre_tap_validate(tb, data, extack);
1670         if (ret)
1671                 return ret;
1672
1673         /* ERSPAN should only have GRE sequence and key flag */
1674         if (data[IFLA_GRE_OFLAGS])
1675                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1676         if (data[IFLA_GRE_IFLAGS])
1677                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1678         if (!data[IFLA_GRE_COLLECT_METADATA] &&
1679             flags != (GRE_SEQ | GRE_KEY))
1680                 return -EINVAL;
1681
1682         /* ERSPAN Session ID only has 10-bit. Since we reuse
1683          * 32-bit key field as ID, check it's range.
1684          */
1685         if (data[IFLA_GRE_IKEY] &&
1686             (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1687                 return -EINVAL;
1688
1689         if (data[IFLA_GRE_OKEY] &&
1690             (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1691                 return -EINVAL;
1692
1693         if (data[IFLA_GRE_ERSPAN_VER]) {
1694                 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1695                 if (ver != 1 && ver != 2)
1696                         return -EINVAL;
1697         }
1698
1699         if (ver == 1) {
1700                 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1701                         u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1702
1703                         if (index & ~INDEX_MASK)
1704                                 return -EINVAL;
1705                 }
1706         } else if (ver == 2) {
1707                 if (data[IFLA_GRE_ERSPAN_DIR]) {
1708                         u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1709
1710                         if (dir & ~(DIR_MASK >> DIR_OFFSET))
1711                                 return -EINVAL;
1712                 }
1713
1714                 if (data[IFLA_GRE_ERSPAN_HWID]) {
1715                         u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1716
1717                         if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1718                                 return -EINVAL;
1719                 }
1720         }
1721
1722         return 0;
1723 }
1724
1725 static void ip6erspan_set_version(struct nlattr *data[],
1726                                   struct __ip6_tnl_parm *parms)
1727 {
1728         if (!data)
1729                 return;
1730
1731         parms->erspan_ver = 1;
1732         if (data[IFLA_GRE_ERSPAN_VER])
1733                 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1734
1735         if (parms->erspan_ver == 1) {
1736                 if (data[IFLA_GRE_ERSPAN_INDEX])
1737                         parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1738         } else if (parms->erspan_ver == 2) {
1739                 if (data[IFLA_GRE_ERSPAN_DIR])
1740                         parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1741                 if (data[IFLA_GRE_ERSPAN_HWID])
1742                         parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1743         }
1744 }
1745
1746 static void ip6gre_netlink_parms(struct nlattr *data[],
1747                                 struct __ip6_tnl_parm *parms)
1748 {
1749         memset(parms, 0, sizeof(*parms));
1750
1751         if (!data)
1752                 return;
1753
1754         if (data[IFLA_GRE_LINK])
1755                 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1756
1757         if (data[IFLA_GRE_IFLAGS])
1758                 parms->i_flags = gre_flags_to_tnl_flags(
1759                                 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1760
1761         if (data[IFLA_GRE_OFLAGS])
1762                 parms->o_flags = gre_flags_to_tnl_flags(
1763                                 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1764
1765         if (data[IFLA_GRE_IKEY])
1766                 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1767
1768         if (data[IFLA_GRE_OKEY])
1769                 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1770
1771         if (data[IFLA_GRE_LOCAL])
1772                 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1773
1774         if (data[IFLA_GRE_REMOTE])
1775                 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1776
1777         if (data[IFLA_GRE_TTL])
1778                 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1779
1780         if (data[IFLA_GRE_ENCAP_LIMIT])
1781                 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1782
1783         if (data[IFLA_GRE_FLOWINFO])
1784                 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1785
1786         if (data[IFLA_GRE_FLAGS])
1787                 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1788
1789         if (data[IFLA_GRE_FWMARK])
1790                 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1791
1792         if (data[IFLA_GRE_COLLECT_METADATA])
1793                 parms->collect_md = true;
1794 }
1795
1796 static int ip6gre_tap_init(struct net_device *dev)
1797 {
1798         int ret;
1799
1800         ret = ip6gre_tunnel_init_common(dev);
1801         if (ret)
1802                 return ret;
1803
1804         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1805
1806         return 0;
1807 }
1808
1809 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1810         .ndo_init = ip6gre_tap_init,
1811         .ndo_uninit = ip6gre_tunnel_uninit,
1812         .ndo_start_xmit = ip6gre_tunnel_xmit,
1813         .ndo_set_mac_address = eth_mac_addr,
1814         .ndo_validate_addr = eth_validate_addr,
1815         .ndo_change_mtu = ip6_tnl_change_mtu,
1816         .ndo_get_stats64 = ip_tunnel_get_stats64,
1817         .ndo_get_iflink = ip6_tnl_get_iflink,
1818 };
1819
1820 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1821 {
1822         int t_hlen;
1823
1824         tunnel->tun_hlen = 8;
1825         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1826                        erspan_hdr_len(tunnel->parms.erspan_ver);
1827
1828         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1829         tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1830         return t_hlen;
1831 }
1832
1833 static int ip6erspan_tap_init(struct net_device *dev)
1834 {
1835         struct ip6_tnl *tunnel;
1836         int t_hlen;
1837         int ret;
1838
1839         tunnel = netdev_priv(dev);
1840
1841         tunnel->dev = dev;
1842         tunnel->net = dev_net(dev);
1843         strcpy(tunnel->parms.name, dev->name);
1844
1845         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1846         if (!dev->tstats)
1847                 return -ENOMEM;
1848
1849         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1850         if (ret)
1851                 goto cleanup_alloc_pcpu_stats;
1852
1853         ret = gro_cells_init(&tunnel->gro_cells, dev);
1854         if (ret)
1855                 goto cleanup_dst_cache_init;
1856
1857         t_hlen = ip6erspan_calc_hlen(tunnel);
1858         dev->mtu = ETH_DATA_LEN - t_hlen;
1859         if (dev->type == ARPHRD_ETHER)
1860                 dev->mtu -= ETH_HLEN;
1861         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1862                 dev->mtu -= 8;
1863
1864         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1865         ip6erspan_tnl_link_config(tunnel, 1);
1866
1867         return 0;
1868
1869 cleanup_dst_cache_init:
1870         dst_cache_destroy(&tunnel->dst_cache);
1871 cleanup_alloc_pcpu_stats:
1872         free_percpu(dev->tstats);
1873         dev->tstats = NULL;
1874         return ret;
1875 }
1876
1877 static const struct net_device_ops ip6erspan_netdev_ops = {
1878         .ndo_init =             ip6erspan_tap_init,
1879         .ndo_uninit =           ip6erspan_tunnel_uninit,
1880         .ndo_start_xmit =       ip6erspan_tunnel_xmit,
1881         .ndo_set_mac_address =  eth_mac_addr,
1882         .ndo_validate_addr =    eth_validate_addr,
1883         .ndo_change_mtu =       ip6_tnl_change_mtu,
1884         .ndo_get_stats64 =      ip_tunnel_get_stats64,
1885         .ndo_get_iflink =       ip6_tnl_get_iflink,
1886 };
1887
1888 static void ip6gre_tap_setup(struct net_device *dev)
1889 {
1890
1891         ether_setup(dev);
1892
1893         dev->max_mtu = 0;
1894         dev->netdev_ops = &ip6gre_tap_netdev_ops;
1895         dev->needs_free_netdev = true;
1896         dev->priv_destructor = ip6gre_dev_free;
1897
1898         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1899         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1900         netif_keep_dst(dev);
1901 }
1902
1903 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1904                                        struct ip_tunnel_encap *ipencap)
1905 {
1906         bool ret = false;
1907
1908         memset(ipencap, 0, sizeof(*ipencap));
1909
1910         if (!data)
1911                 return ret;
1912
1913         if (data[IFLA_GRE_ENCAP_TYPE]) {
1914                 ret = true;
1915                 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1916         }
1917
1918         if (data[IFLA_GRE_ENCAP_FLAGS]) {
1919                 ret = true;
1920                 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1921         }
1922
1923         if (data[IFLA_GRE_ENCAP_SPORT]) {
1924                 ret = true;
1925                 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1926         }
1927
1928         if (data[IFLA_GRE_ENCAP_DPORT]) {
1929                 ret = true;
1930                 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1931         }
1932
1933         return ret;
1934 }
1935
1936 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1937                                  struct nlattr *tb[], struct nlattr *data[],
1938                                  struct netlink_ext_ack *extack)
1939 {
1940         struct ip6_tnl *nt;
1941         struct ip_tunnel_encap ipencap;
1942         int err;
1943
1944         nt = netdev_priv(dev);
1945
1946         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1947                 int err = ip6_tnl_encap_setup(nt, &ipencap);
1948
1949                 if (err < 0)
1950                         return err;
1951         }
1952
1953         if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1954                 eth_hw_addr_random(dev);
1955
1956         nt->dev = dev;
1957         nt->net = dev_net(dev);
1958
1959         err = register_netdevice(dev);
1960         if (err)
1961                 goto out;
1962
1963         if (tb[IFLA_MTU])
1964                 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1965
1966         dev_hold(dev);
1967
1968 out:
1969         return err;
1970 }
1971
1972 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1973                           struct nlattr *tb[], struct nlattr *data[],
1974                           struct netlink_ext_ack *extack)
1975 {
1976         struct ip6_tnl *nt = netdev_priv(dev);
1977         struct net *net = dev_net(dev);
1978         struct ip6gre_net *ign;
1979         int err;
1980
1981         ip6gre_netlink_parms(data, &nt->parms);
1982         ign = net_generic(net, ip6gre_net_id);
1983
1984         if (nt->parms.collect_md) {
1985                 if (rtnl_dereference(ign->collect_md_tun))
1986                         return -EEXIST;
1987         } else {
1988                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1989                         return -EEXIST;
1990         }
1991
1992         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
1993         if (!err) {
1994                 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1995                 ip6gre_tunnel_link_md(ign, nt);
1996                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
1997         }
1998         return err;
1999 }
2000
2001 static struct ip6_tnl *
2002 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2003                          struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2004                          struct netlink_ext_ack *extack)
2005 {
2006         struct ip6_tnl *t, *nt = netdev_priv(dev);
2007         struct net *net = nt->net;
2008         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2009         struct ip_tunnel_encap ipencap;
2010
2011         if (dev == ign->fb_tunnel_dev)
2012                 return ERR_PTR(-EINVAL);
2013
2014         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2015                 int err = ip6_tnl_encap_setup(nt, &ipencap);
2016
2017                 if (err < 0)
2018                         return ERR_PTR(err);
2019         }
2020
2021         ip6gre_netlink_parms(data, p_p);
2022
2023         t = ip6gre_tunnel_locate(net, p_p, 0);
2024
2025         if (t) {
2026                 if (t->dev != dev)
2027                         return ERR_PTR(-EEXIST);
2028         } else {
2029                 t = nt;
2030         }
2031
2032         return t;
2033 }
2034
2035 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2036                              struct nlattr *data[],
2037                              struct netlink_ext_ack *extack)
2038 {
2039         struct ip6_tnl *t = netdev_priv(dev);
2040         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2041         struct __ip6_tnl_parm p;
2042
2043         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2044         if (IS_ERR(t))
2045                 return PTR_ERR(t);
2046
2047         ip6gre_tunnel_unlink_md(ign, t);
2048         ip6gre_tunnel_unlink(ign, t);
2049         ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2050         ip6gre_tunnel_link_md(ign, t);
2051         ip6gre_tunnel_link(ign, t);
2052         return 0;
2053 }
2054
2055 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2056 {
2057         struct net *net = dev_net(dev);
2058         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2059
2060         if (dev != ign->fb_tunnel_dev)
2061                 unregister_netdevice_queue(dev, head);
2062 }
2063
2064 static size_t ip6gre_get_size(const struct net_device *dev)
2065 {
2066         return
2067                 /* IFLA_GRE_LINK */
2068                 nla_total_size(4) +
2069                 /* IFLA_GRE_IFLAGS */
2070                 nla_total_size(2) +
2071                 /* IFLA_GRE_OFLAGS */
2072                 nla_total_size(2) +
2073                 /* IFLA_GRE_IKEY */
2074                 nla_total_size(4) +
2075                 /* IFLA_GRE_OKEY */
2076                 nla_total_size(4) +
2077                 /* IFLA_GRE_LOCAL */
2078                 nla_total_size(sizeof(struct in6_addr)) +
2079                 /* IFLA_GRE_REMOTE */
2080                 nla_total_size(sizeof(struct in6_addr)) +
2081                 /* IFLA_GRE_TTL */
2082                 nla_total_size(1) +
2083                 /* IFLA_GRE_ENCAP_LIMIT */
2084                 nla_total_size(1) +
2085                 /* IFLA_GRE_FLOWINFO */
2086                 nla_total_size(4) +
2087                 /* IFLA_GRE_FLAGS */
2088                 nla_total_size(4) +
2089                 /* IFLA_GRE_ENCAP_TYPE */
2090                 nla_total_size(2) +
2091                 /* IFLA_GRE_ENCAP_FLAGS */
2092                 nla_total_size(2) +
2093                 /* IFLA_GRE_ENCAP_SPORT */
2094                 nla_total_size(2) +
2095                 /* IFLA_GRE_ENCAP_DPORT */
2096                 nla_total_size(2) +
2097                 /* IFLA_GRE_COLLECT_METADATA */
2098                 nla_total_size(0) +
2099                 /* IFLA_GRE_FWMARK */
2100                 nla_total_size(4) +
2101                 /* IFLA_GRE_ERSPAN_INDEX */
2102                 nla_total_size(4) +
2103                 0;
2104 }
2105
2106 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2107 {
2108         struct ip6_tnl *t = netdev_priv(dev);
2109         struct __ip6_tnl_parm *p = &t->parms;
2110         __be16 o_flags = p->o_flags;
2111
2112         if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2113                 if (!p->collect_md)
2114                         o_flags |= TUNNEL_KEY;
2115
2116                 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2117                         goto nla_put_failure;
2118
2119                 if (p->erspan_ver == 1) {
2120                         if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2121                                 goto nla_put_failure;
2122                 } else {
2123                         if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2124                                 goto nla_put_failure;
2125                         if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2126                                 goto nla_put_failure;
2127                 }
2128         }
2129
2130         if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2131             nla_put_be16(skb, IFLA_GRE_IFLAGS,
2132                          gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2133             nla_put_be16(skb, IFLA_GRE_OFLAGS,
2134                          gre_tnl_flags_to_gre_flags(o_flags)) ||
2135             nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2136             nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2137             nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2138             nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2139             nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2140             nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2141             nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2142             nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2143             nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2144                 goto nla_put_failure;
2145
2146         if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2147                         t->encap.type) ||
2148             nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2149                          t->encap.sport) ||
2150             nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2151                          t->encap.dport) ||
2152             nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2153                         t->encap.flags))
2154                 goto nla_put_failure;
2155
2156         if (p->collect_md) {
2157                 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2158                         goto nla_put_failure;
2159         }
2160
2161         return 0;
2162
2163 nla_put_failure:
2164         return -EMSGSIZE;
2165 }
2166
2167 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2168         [IFLA_GRE_LINK]        = { .type = NLA_U32 },
2169         [IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2170         [IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2171         [IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2172         [IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2173         [IFLA_GRE_LOCAL]       = { .len = sizeof_field(struct ipv6hdr, saddr) },
2174         [IFLA_GRE_REMOTE]      = { .len = sizeof_field(struct ipv6hdr, daddr) },
2175         [IFLA_GRE_TTL]         = { .type = NLA_U8 },
2176         [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2177         [IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2178         [IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2179         [IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2180         [IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2181         [IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2182         [IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2183         [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2184         [IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2185         [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2186         [IFLA_GRE_ERSPAN_VER]   = { .type = NLA_U8 },
2187         [IFLA_GRE_ERSPAN_DIR]   = { .type = NLA_U8 },
2188         [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
2189 };
2190
2191 static void ip6erspan_tap_setup(struct net_device *dev)
2192 {
2193         ether_setup(dev);
2194
2195         dev->max_mtu = 0;
2196         dev->netdev_ops = &ip6erspan_netdev_ops;
2197         dev->needs_free_netdev = true;
2198         dev->priv_destructor = ip6gre_dev_free;
2199
2200         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2201         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2202         netif_keep_dst(dev);
2203 }
2204
2205 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2206                              struct nlattr *tb[], struct nlattr *data[],
2207                              struct netlink_ext_ack *extack)
2208 {
2209         struct ip6_tnl *nt = netdev_priv(dev);
2210         struct net *net = dev_net(dev);
2211         struct ip6gre_net *ign;
2212         int err;
2213
2214         ip6gre_netlink_parms(data, &nt->parms);
2215         ip6erspan_set_version(data, &nt->parms);
2216         ign = net_generic(net, ip6gre_net_id);
2217
2218         if (nt->parms.collect_md) {
2219                 if (rtnl_dereference(ign->collect_md_tun_erspan))
2220                         return -EEXIST;
2221         } else {
2222                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2223                         return -EEXIST;
2224         }
2225
2226         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2227         if (!err) {
2228                 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2229                 ip6erspan_tunnel_link_md(ign, nt);
2230                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2231         }
2232         return err;
2233 }
2234
2235 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2236 {
2237         ip6gre_tnl_link_config_common(t);
2238         ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2239 }
2240
2241 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2242                                 const struct __ip6_tnl_parm *p, int set_mtu)
2243 {
2244         ip6gre_tnl_copy_tnl_parm(t, p);
2245         ip6erspan_tnl_link_config(t, set_mtu);
2246         return 0;
2247 }
2248
2249 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2250                                 struct nlattr *data[],
2251                                 struct netlink_ext_ack *extack)
2252 {
2253         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2254         struct __ip6_tnl_parm p;
2255         struct ip6_tnl *t;
2256
2257         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2258         if (IS_ERR(t))
2259                 return PTR_ERR(t);
2260
2261         ip6erspan_set_version(data, &p);
2262         ip6gre_tunnel_unlink_md(ign, t);
2263         ip6gre_tunnel_unlink(ign, t);
2264         ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2265         ip6erspan_tunnel_link_md(ign, t);
2266         ip6gre_tunnel_link(ign, t);
2267         return 0;
2268 }
2269
2270 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2271         .kind           = "ip6gre",
2272         .maxtype        = IFLA_GRE_MAX,
2273         .policy         = ip6gre_policy,
2274         .priv_size      = sizeof(struct ip6_tnl),
2275         .setup          = ip6gre_tunnel_setup,
2276         .validate       = ip6gre_tunnel_validate,
2277         .newlink        = ip6gre_newlink,
2278         .changelink     = ip6gre_changelink,
2279         .dellink        = ip6gre_dellink,
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 ip6gre_tap_ops __read_mostly = {
2286         .kind           = "ip6gretap",
2287         .maxtype        = IFLA_GRE_MAX,
2288         .policy         = ip6gre_policy,
2289         .priv_size      = sizeof(struct ip6_tnl),
2290         .setup          = ip6gre_tap_setup,
2291         .validate       = ip6gre_tap_validate,
2292         .newlink        = ip6gre_newlink,
2293         .changelink     = ip6gre_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 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2300         .kind           = "ip6erspan",
2301         .maxtype        = IFLA_GRE_MAX,
2302         .policy         = ip6gre_policy,
2303         .priv_size      = sizeof(struct ip6_tnl),
2304         .setup          = ip6erspan_tap_setup,
2305         .validate       = ip6erspan_tap_validate,
2306         .newlink        = ip6erspan_newlink,
2307         .changelink     = ip6erspan_changelink,
2308         .get_size       = ip6gre_get_size,
2309         .fill_info      = ip6gre_fill_info,
2310         .get_link_net   = ip6_tnl_get_link_net,
2311 };
2312
2313 /*
2314  *      And now the modules code and kernel interface.
2315  */
2316
2317 static int __init ip6gre_init(void)
2318 {
2319         int err;
2320
2321         pr_info("GRE over IPv6 tunneling driver\n");
2322
2323         err = register_pernet_device(&ip6gre_net_ops);
2324         if (err < 0)
2325                 return err;
2326
2327         err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2328         if (err < 0) {
2329                 pr_info("%s: can't add protocol\n", __func__);
2330                 goto add_proto_failed;
2331         }
2332
2333         err = rtnl_link_register(&ip6gre_link_ops);
2334         if (err < 0)
2335                 goto rtnl_link_failed;
2336
2337         err = rtnl_link_register(&ip6gre_tap_ops);
2338         if (err < 0)
2339                 goto tap_ops_failed;
2340
2341         err = rtnl_link_register(&ip6erspan_tap_ops);
2342         if (err < 0)
2343                 goto erspan_link_failed;
2344
2345 out:
2346         return err;
2347
2348 erspan_link_failed:
2349         rtnl_link_unregister(&ip6gre_tap_ops);
2350 tap_ops_failed:
2351         rtnl_link_unregister(&ip6gre_link_ops);
2352 rtnl_link_failed:
2353         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2354 add_proto_failed:
2355         unregister_pernet_device(&ip6gre_net_ops);
2356         goto out;
2357 }
2358
2359 static void __exit ip6gre_fini(void)
2360 {
2361         rtnl_link_unregister(&ip6gre_tap_ops);
2362         rtnl_link_unregister(&ip6gre_link_ops);
2363         rtnl_link_unregister(&ip6erspan_tap_ops);
2364         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2365         unregister_pernet_device(&ip6gre_net_ops);
2366 }
2367
2368 module_init(ip6gre_init);
2369 module_exit(ip6gre_fini);
2370 MODULE_LICENSE("GPL");
2371 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2372 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2373 MODULE_ALIAS_RTNL_LINK("ip6gre");
2374 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2375 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2376 MODULE_ALIAS_NETDEV("ip6gre0");