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         struct net_device *ndev;
 131
 132         for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
 133                 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
 134                     !ipv6_addr_equal(remote, &t->parms.raddr) ||
 135                     key != t->parms.i_key ||
 136                     !(t->dev->flags & IFF_UP))
 137                         continue;
 138
 139                 if (t->dev->type != ARPHRD_IP6GRE &&
 140                     t->dev->type != dev_type)
 141                         continue;
 142
 143                 score = 0;
 144                 if (t->parms.link != link)
 145                         score |= 1;
 146                 if (t->dev->type != dev_type)
 147                         score |= 2;
 148                 if (score == 0)
 149                         return t;
 150
 151                 if (score < cand_score) {
 152                         cand = t;
 153                         cand_score = score;
 154                 }
 155         }
 156
 157         for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
 158                 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
 159                     key != t->parms.i_key ||
 160                     !(t->dev->flags & IFF_UP))
 161                         continue;
 162
 163                 if (t->dev->type != ARPHRD_IP6GRE &&
 164                     t->dev->type != dev_type)
 165                         continue;
 166
 167                 score = 0;
 168                 if (t->parms.link != link)
 169                         score |= 1;
 170                 if (t->dev->type != dev_type)
 171                         score |= 2;
 172                 if (score == 0)
 173                         return t;
 174
 175                 if (score < cand_score) {
 176                         cand = t;
 177                         cand_score = score;
 178                 }
 179         }
 180
 181         for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
 182                 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
 183                           (!ipv6_addr_equal(local, &t->parms.raddr) ||
 184                                  !ipv6_addr_is_multicast(local))) ||
 185                     key != t->parms.i_key ||
 186                     !(t->dev->flags & IFF_UP))
 187                         continue;
 188
 189                 if (t->dev->type != ARPHRD_IP6GRE &&
 190                     t->dev->type != dev_type)
 191                         continue;
 192
 193                 score = 0;
 194                 if (t->parms.link != link)
 195                         score |= 1;
 196                 if (t->dev->type != dev_type)
 197                         score |= 2;
 198                 if (score == 0)
 199                         return t;
 200
 201                 if (score < cand_score) {
 202                         cand = t;
 203                         cand_score = score;
 204                 }
 205         }
 206
 207         for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
 208                 if (t->parms.i_key != key ||
 209                     !(t->dev->flags & IFF_UP))
 210                         continue;
 211
 212                 if (t->dev->type != ARPHRD_IP6GRE &&
 213                     t->dev->type != dev_type)
 214                         continue;
 215
 216                 score = 0;
 217                 if (t->parms.link != link)
 218                         score |= 1;
 219                 if (t->dev->type != dev_type)
 220                         score |= 2;
 221                 if (score == 0)
 222                         return t;
 223
 224                 if (score < cand_score) {
 225                         cand = t;
 226                         cand_score = score;
 227                 }
 228         }
 229
 230         if (cand)
 231                 return cand;
 232
 233         if (gre_proto == htons(ETH_P_ERSPAN) ||
 234             gre_proto == htons(ETH_P_ERSPAN2))
 235                 t = rcu_dereference(ign->collect_md_tun_erspan);
 236         else
 237                 t = rcu_dereference(ign->collect_md_tun);
 238
 239         if (t && t->dev->flags & IFF_UP)
 240                 return t;
 241
 242         ndev = READ_ONCE(ign->fb_tunnel_dev);
 243         if (ndev && ndev->flags & IFF_UP)
 244                 return netdev_priv(ndev);
 245
 246         return NULL;
 247 }
 248
 249 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
 250                 const struct __ip6_tnl_parm *p)
 251 {
 252         const struct in6_addr *remote = &p->raddr;
 253         const struct in6_addr *local = &p->laddr;
 254         unsigned int h = HASH_KEY(p->i_key);
 255         int prio = 0;
 256
 257         if (!ipv6_addr_any(local))
 258                 prio |= 1;
 259         if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
 260                 prio |= 2;
 261                 h ^= HASH_ADDR(remote);
 262         }
 263
 264         return &ign->tunnels[prio][h];
 265 }
 266
 267 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 268 {
 269         if (t->parms.collect_md)
 270                 rcu_assign_pointer(ign->collect_md_tun, t);
 271 }
 272
 273 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 274 {
 275         if (t->parms.collect_md)
 276                 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
 277 }
 278
 279 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 280 {
 281         if (t->parms.collect_md)
 282                 rcu_assign_pointer(ign->collect_md_tun, NULL);
 283 }
 284
 285 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
 286                                        struct ip6_tnl *t)
 287 {
 288         if (t->parms.collect_md)
 289                 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
 290 }
 291
 292 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
 293                 const struct ip6_tnl *t)
 294 {
 295         return __ip6gre_bucket(ign, &t->parms);
 296 }
 297
 298 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
 299 {
 300         struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
 301
 302         rcu_assign_pointer(t->next, rtnl_dereference(*tp));
 303         rcu_assign_pointer(*tp, t);
 304 }
 305
 306 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
 307 {
 308         struct ip6_tnl __rcu **tp;
 309         struct ip6_tnl *iter;
 310
 311         for (tp = ip6gre_bucket(ign, t);
 312              (iter = rtnl_dereference(*tp)) != NULL;
 313              tp = &iter->next) {
 314                 if (t == iter) {
 315                         rcu_assign_pointer(*tp, t->next);
 316                         break;
 317                 }
 318         }
 319 }
 320
 321 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
 322                                            const struct __ip6_tnl_parm *parms,
 323                                            int type)
 324 {
 325         const struct in6_addr *remote = &parms->raddr;
 326         const struct in6_addr *local = &parms->laddr;
 327         __be32 key = parms->i_key;
 328         int link = parms->link;
 329         struct ip6_tnl *t;
 330         struct ip6_tnl __rcu **tp;
 331         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 332
 333         for (tp = __ip6gre_bucket(ign, parms);
 334              (t = rtnl_dereference(*tp)) != NULL;
 335              tp = &t->next)
 336                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
 337                     ipv6_addr_equal(remote, &t->parms.raddr) &&
 338                     key == t->parms.i_key &&
 339                     link == t->parms.link &&
 340                     type == t->dev->type)
 341                         break;
 342
 343         return t;
 344 }
 345
 346 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
 347                 const struct __ip6_tnl_parm *parms, int create)
 348 {
 349         struct ip6_tnl *t, *nt;
 350         struct net_device *dev;
 351         char name[IFNAMSIZ];
 352         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 353
 354         t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
 355         if (t && create)
 356                 return NULL;
 357         if (t || !create)
 358                 return t;
 359
 360         if (parms->name[0]) {
 361                 if (!dev_valid_name(parms->name))
 362                         return NULL;
 363                 strscpy(name, parms->name, IFNAMSIZ);
 364         } else {
 365                 strcpy(name, "ip6gre%d");
 366         }
 367         dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
 368                            ip6gre_tunnel_setup);
 369         if (!dev)
 370                 return NULL;
 371
 372         dev_net_set(dev, net);
 373
 374         nt = netdev_priv(dev);
 375         nt->parms = *parms;
 376         dev->rtnl_link_ops = &ip6gre_link_ops;
 377
 378         nt->dev = dev;
 379         nt->net = dev_net(dev);
 380
 381         if (register_netdevice(dev) < 0)
 382                 goto failed_free;
 383
 384         ip6gre_tnl_link_config(nt, 1);
 385         ip6gre_tunnel_link(ign, nt);
 386         return nt;
 387
 388 failed_free:
 389         free_netdev(dev);
 390         return NULL;
 391 }
 392
 393 static void ip6erspan_tunnel_uninit(struct net_device *dev)
 394 {
 395         struct ip6_tnl *t = netdev_priv(dev);
 396         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 397
 398         ip6erspan_tunnel_unlink_md(ign, t);
 399         ip6gre_tunnel_unlink(ign, t);
 400         dst_cache_reset(&t->dst_cache);
 401         netdev_put(dev, &t->dev_tracker);
 402 }
 403
 404 static void ip6gre_tunnel_uninit(struct net_device *dev)
 405 {
 406         struct ip6_tnl *t = netdev_priv(dev);
 407         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 408
 409         ip6gre_tunnel_unlink_md(ign, t);
 410         ip6gre_tunnel_unlink(ign, t);
 411         if (ign->fb_tunnel_dev == dev)
 412                 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
 413         dst_cache_reset(&t->dst_cache);
 414         netdev_put(dev, &t->dev_tracker);
 415 }
 416
 417
 418 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 419                        u8 type, u8 code, int offset, __be32 info)
 420 {
 421         struct net *net = dev_net(skb->dev);
 422         const struct ipv6hdr *ipv6h;
 423         struct tnl_ptk_info tpi;
 424         struct ip6_tnl *t;
 425
 426         if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
 427                              offset) < 0)
 428                 return -EINVAL;
 429
 430         ipv6h = (const struct ipv6hdr *)skb->data;
 431         t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
 432                                  tpi.key, tpi.proto);
 433         if (!t)
 434                 return -ENOENT;
 435
 436         switch (type) {
 437         case ICMPV6_DEST_UNREACH:
 438                 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
 439                                     t->parms.name);
 440                 if (code != ICMPV6_PORT_UNREACH)
 441                         break;
 442                 return 0;
 443         case ICMPV6_TIME_EXCEED:
 444                 if (code == ICMPV6_EXC_HOPLIMIT) {
 445                         net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
 446                                             t->parms.name);
 447                         break;
 448                 }
 449                 return 0;
 450         case ICMPV6_PARAMPROB: {
 451                 struct ipv6_tlv_tnl_enc_lim *tel;
 452                 __u32 teli;
 453
 454                 teli = 0;
 455                 if (code == ICMPV6_HDR_FIELD)
 456                         teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
 457
 458                 if (teli && teli == be32_to_cpu(info) - 2) {
 459                         tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
 460                         if (tel->encap_limit == 0) {
 461                                 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
 462                                                     t->parms.name);
 463                         }
 464                 } else {
 465                         net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
 466                                             t->parms.name);
 467                 }
 468                 return 0;
 469         }
 470         case ICMPV6_PKT_TOOBIG:
 471                 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
 472                 return 0;
 473         case NDISC_REDIRECT:
 474                 ip6_redirect(skb, net, skb->dev->ifindex, 0,
 475                              sock_net_uid(net, NULL));
 476                 return 0;
 477         }
 478
 479         if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
 480                 t->err_count++;
 481         else
 482                 t->err_count = 1;
 483         t->err_time = jiffies;
 484
 485         return 0;
 486 }
 487
 488 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
 489 {
 490         const struct ipv6hdr *ipv6h;
 491         struct ip6_tnl *tunnel;
 492
 493         ipv6h = ipv6_hdr(skb);
 494         tunnel = ip6gre_tunnel_lookup(skb->dev,
 495                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 496                                       tpi->proto);
 497         if (tunnel) {
 498                 if (tunnel->parms.collect_md) {
 499                         IP_TUNNEL_DECLARE_FLAGS(flags);
 500                         struct metadata_dst *tun_dst;
 501                         __be64 tun_id;
 502
 503                         ip_tunnel_flags_copy(flags, tpi->flags);
 504                         tun_id = key32_to_tunnel_id(tpi->key);
 505
 506                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
 507                         if (!tun_dst)
 508                                 return PACKET_REJECT;
 509
 510                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 511                 } else {
 512                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 513                 }
 514
 515                 return PACKET_RCVD;
 516         }
 517
 518         return PACKET_REJECT;
 519 }
 520
 521 static int ip6erspan_rcv(struct sk_buff *skb,
 522                          struct tnl_ptk_info *tpi,
 523                          int gre_hdr_len)
 524 {
 525         struct erspan_base_hdr *ershdr;
 526         const struct ipv6hdr *ipv6h;
 527         struct erspan_md2 *md2;
 528         struct ip6_tnl *tunnel;
 529         u8 ver;
 530
 531         if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
 532                 return PACKET_REJECT;
 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                         IP_TUNNEL_DECLARE_FLAGS(flags);
 555                         struct metadata_dst *tun_dst;
 556                         struct ip_tunnel_info *info;
 557                         unsigned char *gh;
 558                         __be64 tun_id;
 559
 560                         __set_bit(IP_TUNNEL_KEY_BIT, tpi->flags);
 561                         ip_tunnel_flags_copy(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                         __set_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
 584                                   info->key.tun_flags);
 585                         info->options_len = sizeof(*md);
 586
 587                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 588
 589                 } else {
 590                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 591                 }
 592
 593                 return PACKET_RCVD;
 594         }
 595
 596         return PACKET_REJECT;
 597 }
 598
 599 static int gre_rcv(struct sk_buff *skb)
 600 {
 601         struct tnl_ptk_info tpi;
 602         bool csum_err = false;
 603         int hdr_len;
 604
 605         hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
 606         if (hdr_len < 0)
 607                 goto drop;
 608
 609         if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 610                 goto drop;
 611
 612         if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
 613                      tpi.proto == htons(ETH_P_ERSPAN2))) {
 614                 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
 615                         return 0;
 616                 goto out;
 617         }
 618
 619         if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 620                 return 0;
 621
 622 out:
 623         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 624 drop:
 625         kfree_skb(skb);
 626         return 0;
 627 }
 628
 629 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 630 {
 631         return iptunnel_handle_offloads(skb,
 632                                         csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 633 }
 634
 635 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
 636                                      struct net_device *dev,
 637                                      struct flowi6 *fl6, __u8 *dsfield,
 638                                      int *encap_limit)
 639 {
 640         const struct iphdr *iph = ip_hdr(skb);
 641         struct ip6_tnl *t = netdev_priv(dev);
 642
 643         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 644                 *encap_limit = t->parms.encap_limit;
 645
 646         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 647
 648         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 649                 *dsfield = ipv4_get_dsfield(iph);
 650         else
 651                 *dsfield = ip6_tclass(t->parms.flowinfo);
 652
 653         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 654                 fl6->flowi6_mark = skb->mark;
 655         else
 656                 fl6->flowi6_mark = t->parms.fwmark;
 657
 658         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 659 }
 660
 661 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
 662                                     struct net_device *dev,
 663                                     struct flowi6 *fl6, __u8 *dsfield,
 664                                     int *encap_limit)
 665 {
 666         struct ipv6hdr *ipv6h;
 667         struct ip6_tnl *t = netdev_priv(dev);
 668         __u16 offset;
 669
 670         offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
 671         /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
 672         ipv6h = ipv6_hdr(skb);
 673
 674         if (offset > 0) {
 675                 struct ipv6_tlv_tnl_enc_lim *tel;
 676
 677                 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
 678                 if (tel->encap_limit == 0) {
 679                         icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
 680                                         ICMPV6_HDR_FIELD, offset + 2);
 681                         return -1;
 682                 }
 683                 *encap_limit = tel->encap_limit - 1;
 684         } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
 685                 *encap_limit = t->parms.encap_limit;
 686         }
 687
 688         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 689
 690         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 691                 *dsfield = ipv6_get_dsfield(ipv6h);
 692         else
 693                 *dsfield = ip6_tclass(t->parms.flowinfo);
 694
 695         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 696                 fl6->flowlabel |= ip6_flowlabel(ipv6h);
 697
 698         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 699                 fl6->flowi6_mark = skb->mark;
 700         else
 701                 fl6->flowi6_mark = t->parms.fwmark;
 702
 703         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 704
 705         return 0;
 706 }
 707
 708 static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
 709                                      struct net_device *dev,
 710                                      struct flowi6 *fl6, __u8 *dsfield,
 711                                      int *encap_limit)
 712 {
 713         struct ip6_tnl *t = netdev_priv(dev);
 714
 715         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 716                 *encap_limit = t->parms.encap_limit;
 717
 718         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 719
 720         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 721                 *dsfield = 0;
 722         else
 723                 *dsfield = ip6_tclass(t->parms.flowinfo);
 724
 725         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 726                 fl6->flowi6_mark = skb->mark;
 727         else
 728                 fl6->flowi6_mark = t->parms.fwmark;
 729
 730         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 731
 732         return 0;
 733 }
 734
 735 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
 736 {
 737         struct ip_tunnel_info *tun_info;
 738
 739         tun_info = skb_tunnel_info(skb);
 740         if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
 741                 return ERR_PTR(-EINVAL);
 742
 743         return tun_info;
 744 }
 745
 746 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
 747                                struct net_device *dev, __u8 dsfield,
 748                                struct flowi6 *fl6, int encap_limit,
 749                                __u32 *pmtu, __be16 proto)
 750 {
 751         struct ip6_tnl *tunnel = netdev_priv(dev);
 752         IP_TUNNEL_DECLARE_FLAGS(flags);
 753         __be16 protocol;
 754
 755         if (dev->type == ARPHRD_ETHER)
 756                 IPCB(skb)->flags = 0;
 757
 758         if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
 759                 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
 760         else
 761                 fl6->daddr = tunnel->parms.raddr;
 762
 763         /* Push GRE header. */
 764         protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
 765
 766         if (tunnel->parms.collect_md) {
 767                 struct ip_tunnel_info *tun_info;
 768                 const struct ip_tunnel_key *key;
 769                 int tun_hlen;
 770
 771                 tun_info = skb_tunnel_info_txcheck(skb);
 772                 if (IS_ERR(tun_info) ||
 773                     unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
 774                         return -EINVAL;
 775
 776                 key = &tun_info->key;
 777                 memset(fl6, 0, sizeof(*fl6));
 778                 fl6->flowi6_proto = IPPROTO_GRE;
 779                 fl6->daddr = key->u.ipv6.dst;
 780                 fl6->flowlabel = key->label;
 781                 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 782                 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
 783
 784                 dsfield = key->tos;
 785                 ip_tunnel_flags_zero(flags);
 786                 __set_bit(IP_TUNNEL_CSUM_BIT, flags);
 787                 __set_bit(IP_TUNNEL_KEY_BIT, flags);
 788                 __set_bit(IP_TUNNEL_SEQ_BIT, flags);
 789                 ip_tunnel_flags_and(flags, flags, key->tun_flags);
 790                 tun_hlen = gre_calc_hlen(flags);
 791
 792                 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
 793                         return -ENOMEM;
 794
 795                 gre_build_header(skb, tun_hlen,
 796                                  flags, protocol,
 797                                  tunnel_id_to_key32(tun_info->key.tun_id),
 798                                  test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
 799                                  htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
 800                                  0);
 801
 802         } else {
 803                 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
 804                         return -ENOMEM;
 805
 806                 ip_tunnel_flags_copy(flags, tunnel->parms.o_flags);
 807
 808                 gre_build_header(skb, tunnel->tun_hlen, flags,
 809                                  protocol, tunnel->parms.o_key,
 810                                  test_bit(IP_TUNNEL_SEQ_BIT, flags) ?
 811                                  htonl(atomic_fetch_inc(&tunnel->o_seqno)) :
 812                                  0);
 813         }
 814
 815         return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
 816                             NEXTHDR_GRE);
 817 }
 818
 819 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
 820 {
 821         struct ip6_tnl *t = netdev_priv(dev);
 822         int encap_limit = -1;
 823         struct flowi6 fl6;
 824         __u8 dsfield = 0;
 825         __u32 mtu;
 826         int err;
 827
 828         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 829
 830         if (!t->parms.collect_md)
 831                 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
 832                                          &dsfield, &encap_limit);
 833
 834         err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
 835                                                 t->parms.o_flags));
 836         if (err)
 837                 return -1;
 838
 839         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
 840                           skb->protocol);
 841         if (err != 0) {
 842                 /* XXX: send ICMP error even if DF is not set. */
 843                 if (err == -EMSGSIZE)
 844                         icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 845                                       htonl(mtu));
 846                 return -1;
 847         }
 848
 849         return 0;
 850 }
 851
 852 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
 853 {
 854         struct ip6_tnl *t = netdev_priv(dev);
 855         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 856         int encap_limit = -1;
 857         struct flowi6 fl6;
 858         __u8 dsfield = 0;
 859         __u32 mtu;
 860         int err;
 861
 862         if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
 863                 return -1;
 864
 865         if (!t->parms.collect_md &&
 866             prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
 867                 return -1;
 868
 869         if (gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
 870                                               t->parms.o_flags)))
 871                 return -1;
 872
 873         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
 874                           &mtu, skb->protocol);
 875         if (err != 0) {
 876                 if (err == -EMSGSIZE)
 877                         icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 878                 return -1;
 879         }
 880
 881         return 0;
 882 }
 883
 884 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
 885 {
 886         struct ip6_tnl *t = netdev_priv(dev);
 887         int encap_limit = -1;
 888         struct flowi6 fl6;
 889         __u8 dsfield = 0;
 890         __u32 mtu;
 891         int err;
 892
 893         if (!t->parms.collect_md &&
 894             prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
 895                 return -1;
 896
 897         err = gre_handle_offloads(skb, test_bit(IP_TUNNEL_CSUM_BIT,
 898                                                 t->parms.o_flags));
 899         if (err)
 900                 return err;
 901         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
 902
 903         return err;
 904 }
 905
 906 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
 907         struct net_device *dev)
 908 {
 909         struct ip6_tnl *t = netdev_priv(dev);
 910         __be16 payload_protocol;
 911         int ret;
 912
 913         if (!pskb_inet_may_pull(skb))
 914                 goto tx_err;
 915
 916         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 917                 goto tx_err;
 918
 919         payload_protocol = skb_protocol(skb, true);
 920         switch (payload_protocol) {
 921         case htons(ETH_P_IP):
 922                 ret = ip6gre_xmit_ipv4(skb, dev);
 923                 break;
 924         case htons(ETH_P_IPV6):
 925                 ret = ip6gre_xmit_ipv6(skb, dev);
 926                 break;
 927         default:
 928                 ret = ip6gre_xmit_other(skb, dev);
 929                 break;
 930         }
 931
 932         if (ret < 0)
 933                 goto tx_err;
 934
 935         return NETDEV_TX_OK;
 936
 937 tx_err:
 938         if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
 939                 DEV_STATS_INC(dev, tx_errors);
 940         DEV_STATS_INC(dev, tx_dropped);
 941         kfree_skb(skb);
 942         return NETDEV_TX_OK;
 943 }
 944
 945 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 946                                          struct net_device *dev)
 947 {
 948         struct ip_tunnel_info *tun_info = NULL;
 949         struct ip6_tnl *t = netdev_priv(dev);
 950         struct dst_entry *dst = skb_dst(skb);
 951         IP_TUNNEL_DECLARE_FLAGS(flags) = { };
 952         bool truncate = false;
 953         int encap_limit = -1;
 954         __u8 dsfield = false;
 955         struct flowi6 fl6;
 956         int err = -EINVAL;
 957         __be16 proto;
 958         __u32 mtu;
 959         int nhoff;
 960
 961         if (!pskb_inet_may_pull(skb))
 962                 goto tx_err;
 963
 964         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 965                 goto tx_err;
 966
 967         if (gre_handle_offloads(skb, false))
 968                 goto tx_err;
 969
 970         if (skb->len > dev->mtu + dev->hard_header_len) {
 971                 if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
 972                         goto tx_err;
 973                 truncate = true;
 974         }
 975
 976         nhoff = skb_network_offset(skb);
 977         if (skb->protocol == htons(ETH_P_IP) &&
 978             (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
 979                 truncate = true;
 980
 981         if (skb->protocol == htons(ETH_P_IPV6)) {
 982                 int thoff;
 983
 984                 if (skb_transport_header_was_set(skb))
 985                         thoff = skb_transport_offset(skb);
 986                 else
 987                         thoff = nhoff + sizeof(struct ipv6hdr);
 988                 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
 989                         truncate = true;
 990         }
 991
 992         if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
 993                 goto tx_err;
 994
 995         __clear_bit(IP_TUNNEL_KEY_BIT, t->parms.o_flags);
 996         IPCB(skb)->flags = 0;
 997
 998         /* For collect_md mode, derive fl6 from the tunnel key,
 999          * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
1000          */
1001         if (t->parms.collect_md) {
1002                 const struct ip_tunnel_key *key;
1003                 struct erspan_metadata *md;
1004                 __be32 tun_id;
1005
1006                 tun_info = skb_tunnel_info_txcheck(skb);
1007                 if (IS_ERR(tun_info) ||
1008                     unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
1009                         goto tx_err;
1010
1011                 key = &tun_info->key;
1012                 memset(&fl6, 0, sizeof(fl6));
1013                 fl6.flowi6_proto = IPPROTO_GRE;
1014                 fl6.daddr = key->u.ipv6.dst;
1015                 fl6.flowlabel = key->label;
1016                 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1017                 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1018
1019                 dsfield = key->tos;
1020                 if (!test_bit(IP_TUNNEL_ERSPAN_OPT_BIT,
1021                               tun_info->key.tun_flags))
1022                         goto tx_err;
1023                 if (tun_info->options_len < sizeof(*md))
1024                         goto tx_err;
1025                 md = ip_tunnel_info_opts(tun_info);
1026
1027                 tun_id = tunnel_id_to_key32(key->tun_id);
1028                 if (md->version == 1) {
1029                         erspan_build_header(skb,
1030                                             ntohl(tun_id),
1031                                             ntohl(md->u.index), truncate,
1032                                             false);
1033                         proto = htons(ETH_P_ERSPAN);
1034                 } else if (md->version == 2) {
1035                         erspan_build_header_v2(skb,
1036                                                ntohl(tun_id),
1037                                                md->u.md2.dir,
1038                                                get_hwid(&md->u.md2),
1039                                                truncate, false);
1040                         proto = htons(ETH_P_ERSPAN2);
1041                 } else {
1042                         goto tx_err;
1043                 }
1044         } else {
1045                 switch (skb->protocol) {
1046                 case htons(ETH_P_IP):
1047                         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1048                         prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1049                                                  &dsfield, &encap_limit);
1050                         break;
1051                 case htons(ETH_P_IPV6):
1052                         if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1053                                 goto tx_err;
1054                         if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1055                                                      &dsfield, &encap_limit))
1056                                 goto tx_err;
1057                         break;
1058                 default:
1059                         memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1060                         break;
1061                 }
1062
1063                 if (t->parms.erspan_ver == 1) {
1064                         erspan_build_header(skb, ntohl(t->parms.o_key),
1065                                             t->parms.index,
1066                                             truncate, false);
1067                         proto = htons(ETH_P_ERSPAN);
1068                 } else if (t->parms.erspan_ver == 2) {
1069                         erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1070                                                t->parms.dir,
1071                                                t->parms.hwid,
1072                                                truncate, false);
1073                         proto = htons(ETH_P_ERSPAN2);
1074                 } else {
1075                         goto tx_err;
1076                 }
1077
1078                 fl6.daddr = t->parms.raddr;
1079         }
1080
1081         /* Push GRE header. */
1082         __set_bit(IP_TUNNEL_SEQ_BIT, flags);
1083         gre_build_header(skb, 8, flags, proto, 0,
1084                          htonl(atomic_fetch_inc(&t->o_seqno)));
1085
1086         /* TooBig packet may have updated dst->dev's mtu */
1087         if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1088                 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1089
1090         err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1091                            NEXTHDR_GRE);
1092         if (err != 0) {
1093                 /* XXX: send ICMP error even if DF is not set. */
1094                 if (err == -EMSGSIZE) {
1095                         if (skb->protocol == htons(ETH_P_IP))
1096                                 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1097                                               ICMP_FRAG_NEEDED, htonl(mtu));
1098                         else
1099                                 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1100                 }
1101
1102                 goto tx_err;
1103         }
1104         return NETDEV_TX_OK;
1105
1106 tx_err:
1107         if (!IS_ERR(tun_info))
1108                 DEV_STATS_INC(dev, tx_errors);
1109         DEV_STATS_INC(dev, tx_dropped);
1110         kfree_skb(skb);
1111         return NETDEV_TX_OK;
1112 }
1113
1114 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1115 {
1116         struct net_device *dev = t->dev;
1117         struct __ip6_tnl_parm *p = &t->parms;
1118         struct flowi6 *fl6 = &t->fl.u.ip6;
1119
1120         if (dev->type != ARPHRD_ETHER) {
1121                 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1122                 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1123         }
1124
1125         /* Set up flowi template */
1126         fl6->saddr = p->laddr;
1127         fl6->daddr = p->raddr;
1128         fl6->flowi6_oif = p->link;
1129         fl6->flowlabel = 0;
1130         fl6->flowi6_proto = IPPROTO_GRE;
1131         fl6->fl6_gre_key = t->parms.o_key;
1132
1133         if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1134                 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1135         if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1136                 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1137
1138         p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1139         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1140
1141         if (p->flags&IP6_TNL_F_CAP_XMIT &&
1142                         p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1143                 dev->flags |= IFF_POINTOPOINT;
1144         else
1145                 dev->flags &= ~IFF_POINTOPOINT;
1146 }
1147
1148 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1149                                          int t_hlen)
1150 {
1151         const struct __ip6_tnl_parm *p = &t->parms;
1152         struct net_device *dev = t->dev;
1153
1154         if (p->flags & IP6_TNL_F_CAP_XMIT) {
1155                 int strict = (ipv6_addr_type(&p->raddr) &
1156                               (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1157
1158                 struct rt6_info *rt = rt6_lookup(t->net,
1159                                                  &p->raddr, &p->laddr,
1160                                                  p->link, NULL, strict);
1161
1162                 if (!rt)
1163                         return;
1164
1165                 if (rt->dst.dev) {
1166                         unsigned short dst_len = rt->dst.dev->hard_header_len +
1167                                                  t_hlen;
1168
1169                         if (t->dev->header_ops)
1170                                 dev->hard_header_len = dst_len;
1171                         else
1172                                 dev->needed_headroom = dst_len;
1173
1174                         if (set_mtu) {
1175                                 int mtu = rt->dst.dev->mtu - t_hlen;
1176
1177                                 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1178                                         mtu -= 8;
1179                                 if (dev->type == ARPHRD_ETHER)
1180                                         mtu -= ETH_HLEN;
1181
1182                                 if (mtu < IPV6_MIN_MTU)
1183                                         mtu = IPV6_MIN_MTU;
1184                                 WRITE_ONCE(dev->mtu, mtu);
1185                         }
1186                 }
1187                 ip6_rt_put(rt);
1188         }
1189 }
1190
1191 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1192 {
1193         int t_hlen;
1194
1195         tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1196         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1197
1198         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1199
1200         if (tunnel->dev->header_ops)
1201                 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1202         else
1203                 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1204
1205         return t_hlen;
1206 }
1207
1208 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1209 {
1210         ip6gre_tnl_link_config_common(t);
1211         ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1212 }
1213
1214 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1215                                      const struct __ip6_tnl_parm *p)
1216 {
1217         t->parms.laddr = p->laddr;
1218         t->parms.raddr = p->raddr;
1219         t->parms.flags = p->flags;
1220         t->parms.hop_limit = p->hop_limit;
1221         t->parms.encap_limit = p->encap_limit;
1222         t->parms.flowinfo = p->flowinfo;
1223         t->parms.link = p->link;
1224         t->parms.proto = p->proto;
1225         t->parms.i_key = p->i_key;
1226         t->parms.o_key = p->o_key;
1227         ip_tunnel_flags_copy(t->parms.i_flags, p->i_flags);
1228         ip_tunnel_flags_copy(t->parms.o_flags, p->o_flags);
1229         t->parms.fwmark = p->fwmark;
1230         t->parms.erspan_ver = p->erspan_ver;
1231         t->parms.index = p->index;
1232         t->parms.dir = p->dir;
1233         t->parms.hwid = p->hwid;
1234         dst_cache_reset(&t->dst_cache);
1235 }
1236
1237 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1238                              int set_mtu)
1239 {
1240         ip6gre_tnl_copy_tnl_parm(t, p);
1241         ip6gre_tnl_link_config(t, set_mtu);
1242         return 0;
1243 }
1244
1245 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1246         const struct ip6_tnl_parm2 *u)
1247 {
1248         p->laddr = u->laddr;
1249         p->raddr = u->raddr;
1250         p->flags = u->flags;
1251         p->hop_limit = u->hop_limit;
1252         p->encap_limit = u->encap_limit;
1253         p->flowinfo = u->flowinfo;
1254         p->link = u->link;
1255         p->i_key = u->i_key;
1256         p->o_key = u->o_key;
1257         gre_flags_to_tnl_flags(p->i_flags, u->i_flags);
1258         gre_flags_to_tnl_flags(p->o_flags, u->o_flags);
1259         memcpy(p->name, u->name, sizeof(u->name));
1260 }
1261
1262 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1263         const struct __ip6_tnl_parm *p)
1264 {
1265         u->proto = IPPROTO_GRE;
1266         u->laddr = p->laddr;
1267         u->raddr = p->raddr;
1268         u->flags = p->flags;
1269         u->hop_limit = p->hop_limit;
1270         u->encap_limit = p->encap_limit;
1271         u->flowinfo = p->flowinfo;
1272         u->link = p->link;
1273         u->i_key = p->i_key;
1274         u->o_key = p->o_key;
1275         u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1276         u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1277         memcpy(u->name, p->name, sizeof(u->name));
1278 }
1279
1280 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1281                                         struct ifreq *ifr, void __user *data,
1282                                         int cmd)
1283 {
1284         int err = 0;
1285         struct ip6_tnl_parm2 p;
1286         struct __ip6_tnl_parm p1;
1287         struct ip6_tnl *t = netdev_priv(dev);
1288         struct net *net = t->net;
1289         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1290
1291         memset(&p1, 0, sizeof(p1));
1292
1293         switch (cmd) {
1294         case SIOCGETTUNNEL:
1295                 if (dev == ign->fb_tunnel_dev) {
1296                         if (copy_from_user(&p, data, sizeof(p))) {
1297                                 err = -EFAULT;
1298                                 break;
1299                         }
1300                         ip6gre_tnl_parm_from_user(&p1, &p);
1301                         t = ip6gre_tunnel_locate(net, &p1, 0);
1302                         if (!t)
1303                                 t = netdev_priv(dev);
1304                 }
1305                 memset(&p, 0, sizeof(p));
1306                 ip6gre_tnl_parm_to_user(&p, &t->parms);
1307                 if (copy_to_user(data, &p, sizeof(p)))
1308                         err = -EFAULT;
1309                 break;
1310
1311         case SIOCADDTUNNEL:
1312         case SIOCCHGTUNNEL:
1313                 err = -EPERM;
1314                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1315                         goto done;
1316
1317                 err = -EFAULT;
1318                 if (copy_from_user(&p, data, sizeof(p)))
1319                         goto done;
1320
1321                 err = -EINVAL;
1322                 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1323                         goto done;
1324
1325                 if (!(p.i_flags&GRE_KEY))
1326                         p.i_key = 0;
1327                 if (!(p.o_flags&GRE_KEY))
1328                         p.o_key = 0;
1329
1330                 ip6gre_tnl_parm_from_user(&p1, &p);
1331                 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1332
1333                 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1334                         if (t) {
1335                                 if (t->dev != dev) {
1336                                         err = -EEXIST;
1337                                         break;
1338                                 }
1339                         } else {
1340                                 t = netdev_priv(dev);
1341
1342                                 ip6gre_tunnel_unlink(ign, t);
1343                                 synchronize_net();
1344                                 ip6gre_tnl_change(t, &p1, 1);
1345                                 ip6gre_tunnel_link(ign, t);
1346                                 netdev_state_change(dev);
1347                         }
1348                 }
1349
1350                 if (t) {
1351                         err = 0;
1352
1353                         memset(&p, 0, sizeof(p));
1354                         ip6gre_tnl_parm_to_user(&p, &t->parms);
1355                         if (copy_to_user(data, &p, sizeof(p)))
1356                                 err = -EFAULT;
1357                 } else
1358                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1359                 break;
1360
1361         case SIOCDELTUNNEL:
1362                 err = -EPERM;
1363                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1364                         goto done;
1365
1366                 if (dev == ign->fb_tunnel_dev) {
1367                         err = -EFAULT;
1368                         if (copy_from_user(&p, data, sizeof(p)))
1369                                 goto done;
1370                         err = -ENOENT;
1371                         ip6gre_tnl_parm_from_user(&p1, &p);
1372                         t = ip6gre_tunnel_locate(net, &p1, 0);
1373                         if (!t)
1374                                 goto done;
1375                         err = -EPERM;
1376                         if (t == netdev_priv(ign->fb_tunnel_dev))
1377                                 goto done;
1378                         dev = t->dev;
1379                 }
1380                 unregister_netdevice(dev);
1381                 err = 0;
1382                 break;
1383
1384         default:
1385                 err = -EINVAL;
1386         }
1387
1388 done:
1389         return err;
1390 }
1391
1392 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1393                          unsigned short type, const void *daddr,
1394                          const void *saddr, unsigned int len)
1395 {
1396         struct ip6_tnl *t = netdev_priv(dev);
1397         struct ipv6hdr *ipv6h;
1398         __be16 *p;
1399
1400         ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1401         ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1402                                                   t->fl.u.ip6.flowlabel,
1403                                                   true, &t->fl.u.ip6));
1404         ipv6h->hop_limit = t->parms.hop_limit;
1405         ipv6h->nexthdr = NEXTHDR_GRE;
1406         ipv6h->saddr = t->parms.laddr;
1407         ipv6h->daddr = t->parms.raddr;
1408
1409         p = (__be16 *)(ipv6h + 1);
1410         p[0] = ip_tunnel_flags_to_be16(t->parms.o_flags);
1411         p[1] = htons(type);
1412
1413         /*
1414          *      Set the source hardware address.
1415          */
1416
1417         if (saddr)
1418                 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1419         if (daddr)
1420                 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1421         if (!ipv6_addr_any(&ipv6h->daddr))
1422                 return t->hlen;
1423
1424         return -t->hlen;
1425 }
1426
1427 static const struct header_ops ip6gre_header_ops = {
1428         .create = ip6gre_header,
1429 };
1430
1431 static const struct net_device_ops ip6gre_netdev_ops = {
1432         .ndo_init               = ip6gre_tunnel_init,
1433         .ndo_uninit             = ip6gre_tunnel_uninit,
1434         .ndo_start_xmit         = ip6gre_tunnel_xmit,
1435         .ndo_siocdevprivate     = ip6gre_tunnel_siocdevprivate,
1436         .ndo_change_mtu         = ip6_tnl_change_mtu,
1437         .ndo_get_iflink         = ip6_tnl_get_iflink,
1438 };
1439
1440 static void ip6gre_dev_free(struct net_device *dev)
1441 {
1442         struct ip6_tnl *t = netdev_priv(dev);
1443
1444         gro_cells_destroy(&t->gro_cells);
1445         dst_cache_destroy(&t->dst_cache);
1446 }
1447
1448 static void ip6gre_tunnel_setup(struct net_device *dev)
1449 {
1450         dev->netdev_ops = &ip6gre_netdev_ops;
1451         dev->needs_free_netdev = true;
1452         dev->priv_destructor = ip6gre_dev_free;
1453
1454         dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1455         dev->type = ARPHRD_IP6GRE;
1456
1457         dev->flags |= IFF_NOARP;
1458         dev->addr_len = sizeof(struct in6_addr);
1459         netif_keep_dst(dev);
1460         /* This perm addr will be used as interface identifier by IPv6 */
1461         dev->addr_assign_type = NET_ADDR_RANDOM;
1462         eth_random_addr(dev->perm_addr);
1463 }
1464
1465 #define GRE6_FEATURES (NETIF_F_SG |             \
1466                        NETIF_F_FRAGLIST |       \
1467                        NETIF_F_HIGHDMA |        \
1468                        NETIF_F_HW_CSUM)
1469
1470 static void ip6gre_tnl_init_features(struct net_device *dev)
1471 {
1472         struct ip6_tnl *nt = netdev_priv(dev);
1473
1474         dev->features           |= GRE6_FEATURES | NETIF_F_LLTX;
1475         dev->hw_features        |= GRE6_FEATURES;
1476
1477         /* TCP offload with GRE SEQ is not supported, nor can we support 2
1478          * levels of outer headers requiring an update.
1479          */
1480         if (test_bit(IP_TUNNEL_SEQ_BIT, nt->parms.o_flags))
1481                 return;
1482         if (test_bit(IP_TUNNEL_CSUM_BIT, nt->parms.o_flags) &&
1483             nt->encap.type != TUNNEL_ENCAP_NONE)
1484                 return;
1485
1486         dev->features |= NETIF_F_GSO_SOFTWARE;
1487         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1488 }
1489
1490 static int ip6gre_tunnel_init_common(struct net_device *dev)
1491 {
1492         struct ip6_tnl *tunnel;
1493         int ret;
1494         int t_hlen;
1495
1496         tunnel = netdev_priv(dev);
1497
1498         tunnel->dev = dev;
1499         tunnel->net = dev_net(dev);
1500         strcpy(tunnel->parms.name, dev->name);
1501
1502         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1503         if (ret)
1504                 return ret;
1505
1506         ret = gro_cells_init(&tunnel->gro_cells, dev);
1507         if (ret)
1508                 goto cleanup_dst_cache_init;
1509
1510         t_hlen = ip6gre_calc_hlen(tunnel);
1511         dev->mtu = ETH_DATA_LEN - t_hlen;
1512         if (dev->type == ARPHRD_ETHER)
1513                 dev->mtu -= ETH_HLEN;
1514         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1515                 dev->mtu -= 8;
1516
1517         if (tunnel->parms.collect_md) {
1518                 netif_keep_dst(dev);
1519         }
1520         ip6gre_tnl_init_features(dev);
1521
1522         netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1523         netdev_lockdep_set_classes(dev);
1524         return 0;
1525
1526 cleanup_dst_cache_init:
1527         dst_cache_destroy(&tunnel->dst_cache);
1528         return ret;
1529 }
1530
1531 static int ip6gre_tunnel_init(struct net_device *dev)
1532 {
1533         struct ip6_tnl *tunnel;
1534         int ret;
1535
1536         ret = ip6gre_tunnel_init_common(dev);
1537         if (ret)
1538                 return ret;
1539
1540         tunnel = netdev_priv(dev);
1541
1542         if (tunnel->parms.collect_md)
1543                 return 0;
1544
1545         __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1546         memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1547
1548         if (ipv6_addr_any(&tunnel->parms.raddr))
1549                 dev->header_ops = &ip6gre_header_ops;
1550
1551         return 0;
1552 }
1553
1554 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1555 {
1556         struct ip6_tnl *tunnel = netdev_priv(dev);
1557
1558         tunnel->dev = dev;
1559         tunnel->net = dev_net(dev);
1560         strcpy(tunnel->parms.name, dev->name);
1561
1562         tunnel->hlen            = sizeof(struct ipv6hdr) + 4;
1563 }
1564
1565 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1566         .handler     = gre_rcv,
1567         .err_handler = ip6gre_err,
1568         .flags       = INET6_PROTO_FINAL,
1569 };
1570
1571 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1572 {
1573         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1574         struct net_device *dev, *aux;
1575         int prio;
1576
1577         for_each_netdev_safe(net, dev, aux)
1578                 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1579                     dev->rtnl_link_ops == &ip6gre_tap_ops ||
1580                     dev->rtnl_link_ops == &ip6erspan_tap_ops)
1581                         unregister_netdevice_queue(dev, head);
1582
1583         for (prio = 0; prio < 4; prio++) {
1584                 int h;
1585                 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1586                         struct ip6_tnl *t;
1587
1588                         t = rtnl_dereference(ign->tunnels[prio][h]);
1589
1590                         while (t) {
1591                                 /* If dev is in the same netns, it has already
1592                                  * been added to the list by the previous loop.
1593                                  */
1594                                 if (!net_eq(dev_net(t->dev), net))
1595                                         unregister_netdevice_queue(t->dev,
1596                                                                    head);
1597                                 t = rtnl_dereference(t->next);
1598                         }
1599                 }
1600         }
1601 }
1602
1603 static int __net_init ip6gre_init_net(struct net *net)
1604 {
1605         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1606         struct net_device *ndev;
1607         int err;
1608
1609         if (!net_has_fallback_tunnels(net))
1610                 return 0;
1611         ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1612                             NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1613         if (!ndev) {
1614                 err = -ENOMEM;
1615                 goto err_alloc_dev;
1616         }
1617         ign->fb_tunnel_dev = ndev;
1618         dev_net_set(ign->fb_tunnel_dev, net);
1619         /* FB netdevice is special: we have one, and only one per netns.
1620          * Allowing to move it to another netns is clearly unsafe.
1621          */
1622         ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1623
1624
1625         ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1626         ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1627
1628         err = register_netdev(ign->fb_tunnel_dev);
1629         if (err)
1630                 goto err_reg_dev;
1631
1632         rcu_assign_pointer(ign->tunnels_wc[0],
1633                            netdev_priv(ign->fb_tunnel_dev));
1634         return 0;
1635
1636 err_reg_dev:
1637         free_netdev(ndev);
1638 err_alloc_dev:
1639         return err;
1640 }
1641
1642 static void __net_exit ip6gre_exit_batch_rtnl(struct list_head *net_list,
1643                                               struct list_head *dev_to_kill)
1644 {
1645         struct net *net;
1646
1647         ASSERT_RTNL();
1648         list_for_each_entry(net, net_list, exit_list)
1649                 ip6gre_destroy_tunnels(net, dev_to_kill);
1650 }
1651
1652 static struct pernet_operations ip6gre_net_ops = {
1653         .init = ip6gre_init_net,
1654         .exit_batch_rtnl = ip6gre_exit_batch_rtnl,
1655         .id   = &ip6gre_net_id,
1656         .size = sizeof(struct ip6gre_net),
1657 };
1658
1659 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1660                                   struct netlink_ext_ack *extack)
1661 {
1662         __be16 flags;
1663
1664         if (!data)
1665                 return 0;
1666
1667         flags = 0;
1668         if (data[IFLA_GRE_IFLAGS])
1669                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1670         if (data[IFLA_GRE_OFLAGS])
1671                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1672         if (flags & (GRE_VERSION|GRE_ROUTING))
1673                 return -EINVAL;
1674
1675         return 0;
1676 }
1677
1678 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1679                                struct netlink_ext_ack *extack)
1680 {
1681         struct in6_addr daddr;
1682
1683         if (tb[IFLA_ADDRESS]) {
1684                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1685                         return -EINVAL;
1686                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1687                         return -EADDRNOTAVAIL;
1688         }
1689
1690         if (!data)
1691                 goto out;
1692
1693         if (data[IFLA_GRE_REMOTE]) {
1694                 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1695                 if (ipv6_addr_any(&daddr))
1696                         return -EINVAL;
1697         }
1698
1699 out:
1700         return ip6gre_tunnel_validate(tb, data, extack);
1701 }
1702
1703 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1704                                   struct netlink_ext_ack *extack)
1705 {
1706         __be16 flags = 0;
1707         int ret, ver = 0;
1708
1709         if (!data)
1710                 return 0;
1711
1712         ret = ip6gre_tap_validate(tb, data, extack);
1713         if (ret)
1714                 return ret;
1715
1716         /* ERSPAN should only have GRE sequence and key flag */
1717         if (data[IFLA_GRE_OFLAGS])
1718                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1719         if (data[IFLA_GRE_IFLAGS])
1720                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1721         if (!data[IFLA_GRE_COLLECT_METADATA] &&
1722             flags != (GRE_SEQ | GRE_KEY))
1723                 return -EINVAL;
1724
1725         /* ERSPAN Session ID only has 10-bit. Since we reuse
1726          * 32-bit key field as ID, check it's range.
1727          */
1728         if (data[IFLA_GRE_IKEY] &&
1729             (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1730                 return -EINVAL;
1731
1732         if (data[IFLA_GRE_OKEY] &&
1733             (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1734                 return -EINVAL;
1735
1736         if (data[IFLA_GRE_ERSPAN_VER]) {
1737                 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1738                 if (ver != 1 && ver != 2)
1739                         return -EINVAL;
1740         }
1741
1742         if (ver == 1) {
1743                 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1744                         u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1745
1746                         if (index & ~INDEX_MASK)
1747                                 return -EINVAL;
1748                 }
1749         } else if (ver == 2) {
1750                 if (data[IFLA_GRE_ERSPAN_DIR]) {
1751                         u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1752
1753                         if (dir & ~(DIR_MASK >> DIR_OFFSET))
1754                                 return -EINVAL;
1755                 }
1756
1757                 if (data[IFLA_GRE_ERSPAN_HWID]) {
1758                         u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1759
1760                         if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1761                                 return -EINVAL;
1762                 }
1763         }
1764
1765         return 0;
1766 }
1767
1768 static void ip6erspan_set_version(struct nlattr *data[],
1769                                   struct __ip6_tnl_parm *parms)
1770 {
1771         if (!data)
1772                 return;
1773
1774         parms->erspan_ver = 1;
1775         if (data[IFLA_GRE_ERSPAN_VER])
1776                 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1777
1778         if (parms->erspan_ver == 1) {
1779                 if (data[IFLA_GRE_ERSPAN_INDEX])
1780                         parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1781         } else if (parms->erspan_ver == 2) {
1782                 if (data[IFLA_GRE_ERSPAN_DIR])
1783                         parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1784                 if (data[IFLA_GRE_ERSPAN_HWID])
1785                         parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1786         }
1787 }
1788
1789 static void ip6gre_netlink_parms(struct nlattr *data[],
1790                                 struct __ip6_tnl_parm *parms)
1791 {
1792         memset(parms, 0, sizeof(*parms));
1793
1794         if (!data)
1795                 return;
1796
1797         if (data[IFLA_GRE_LINK])
1798                 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1799
1800         if (data[IFLA_GRE_IFLAGS])
1801                 gre_flags_to_tnl_flags(parms->i_flags,
1802                                        nla_get_be16(data[IFLA_GRE_IFLAGS]));
1803
1804         if (data[IFLA_GRE_OFLAGS])
1805                 gre_flags_to_tnl_flags(parms->o_flags,
1806                                        nla_get_be16(data[IFLA_GRE_OFLAGS]));
1807
1808         if (data[IFLA_GRE_IKEY])
1809                 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1810
1811         if (data[IFLA_GRE_OKEY])
1812                 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1813
1814         if (data[IFLA_GRE_LOCAL])
1815                 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1816
1817         if (data[IFLA_GRE_REMOTE])
1818                 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1819
1820         if (data[IFLA_GRE_TTL])
1821                 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1822
1823         if (data[IFLA_GRE_ENCAP_LIMIT])
1824                 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1825
1826         if (data[IFLA_GRE_FLOWINFO])
1827                 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1828
1829         if (data[IFLA_GRE_FLAGS])
1830                 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1831
1832         if (data[IFLA_GRE_FWMARK])
1833                 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1834
1835         if (data[IFLA_GRE_COLLECT_METADATA])
1836                 parms->collect_md = true;
1837 }
1838
1839 static int ip6gre_tap_init(struct net_device *dev)
1840 {
1841         int ret;
1842
1843         ret = ip6gre_tunnel_init_common(dev);
1844         if (ret)
1845                 return ret;
1846
1847         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1848
1849         return 0;
1850 }
1851
1852 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1853         .ndo_init = ip6gre_tap_init,
1854         .ndo_uninit = ip6gre_tunnel_uninit,
1855         .ndo_start_xmit = ip6gre_tunnel_xmit,
1856         .ndo_set_mac_address = eth_mac_addr,
1857         .ndo_validate_addr = eth_validate_addr,
1858         .ndo_change_mtu = ip6_tnl_change_mtu,
1859         .ndo_get_iflink = ip6_tnl_get_iflink,
1860 };
1861
1862 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1863 {
1864         int t_hlen;
1865
1866         tunnel->tun_hlen = 8;
1867         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1868                        erspan_hdr_len(tunnel->parms.erspan_ver);
1869
1870         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1871         tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1872         return t_hlen;
1873 }
1874
1875 static int ip6erspan_tap_init(struct net_device *dev)
1876 {
1877         struct ip6_tnl *tunnel;
1878         int t_hlen;
1879         int ret;
1880
1881         tunnel = netdev_priv(dev);
1882
1883         tunnel->dev = dev;
1884         tunnel->net = dev_net(dev);
1885         strcpy(tunnel->parms.name, dev->name);
1886
1887         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1888         if (ret)
1889                 return ret;
1890
1891         ret = gro_cells_init(&tunnel->gro_cells, dev);
1892         if (ret)
1893                 goto cleanup_dst_cache_init;
1894
1895         t_hlen = ip6erspan_calc_hlen(tunnel);
1896         dev->mtu = ETH_DATA_LEN - t_hlen;
1897         if (dev->type == ARPHRD_ETHER)
1898                 dev->mtu -= ETH_HLEN;
1899         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1900                 dev->mtu -= 8;
1901
1902         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1903         ip6erspan_tnl_link_config(tunnel, 1);
1904
1905         netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1906         netdev_lockdep_set_classes(dev);
1907         return 0;
1908
1909 cleanup_dst_cache_init:
1910         dst_cache_destroy(&tunnel->dst_cache);
1911         return ret;
1912 }
1913
1914 static const struct net_device_ops ip6erspan_netdev_ops = {
1915         .ndo_init =             ip6erspan_tap_init,
1916         .ndo_uninit =           ip6erspan_tunnel_uninit,
1917         .ndo_start_xmit =       ip6erspan_tunnel_xmit,
1918         .ndo_set_mac_address =  eth_mac_addr,
1919         .ndo_validate_addr =    eth_validate_addr,
1920         .ndo_change_mtu =       ip6_tnl_change_mtu,
1921         .ndo_get_iflink =       ip6_tnl_get_iflink,
1922 };
1923
1924 static void ip6gre_tap_setup(struct net_device *dev)
1925 {
1926
1927         ether_setup(dev);
1928
1929         dev->max_mtu = 0;
1930         dev->netdev_ops = &ip6gre_tap_netdev_ops;
1931         dev->needs_free_netdev = true;
1932         dev->priv_destructor = ip6gre_dev_free;
1933
1934         dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
1935         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1936         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1937         netif_keep_dst(dev);
1938 }
1939
1940 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1941                                        struct ip_tunnel_encap *ipencap)
1942 {
1943         bool ret = false;
1944
1945         memset(ipencap, 0, sizeof(*ipencap));
1946
1947         if (!data)
1948                 return ret;
1949
1950         if (data[IFLA_GRE_ENCAP_TYPE]) {
1951                 ret = true;
1952                 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1953         }
1954
1955         if (data[IFLA_GRE_ENCAP_FLAGS]) {
1956                 ret = true;
1957                 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1958         }
1959
1960         if (data[IFLA_GRE_ENCAP_SPORT]) {
1961                 ret = true;
1962                 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1963         }
1964
1965         if (data[IFLA_GRE_ENCAP_DPORT]) {
1966                 ret = true;
1967                 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1968         }
1969
1970         return ret;
1971 }
1972
1973 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1974                                  struct nlattr *tb[], struct nlattr *data[],
1975                                  struct netlink_ext_ack *extack)
1976 {
1977         struct ip6_tnl *nt;
1978         struct ip_tunnel_encap ipencap;
1979         int err;
1980
1981         nt = netdev_priv(dev);
1982
1983         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1984                 int err = ip6_tnl_encap_setup(nt, &ipencap);
1985
1986                 if (err < 0)
1987                         return err;
1988         }
1989
1990         if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1991                 eth_hw_addr_random(dev);
1992
1993         nt->dev = dev;
1994         nt->net = dev_net(dev);
1995
1996         err = register_netdevice(dev);
1997         if (err)
1998                 goto out;
1999
2000         if (tb[IFLA_MTU])
2001                 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2002
2003 out:
2004         return err;
2005 }
2006
2007 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2008                           struct nlattr *tb[], struct nlattr *data[],
2009                           struct netlink_ext_ack *extack)
2010 {
2011         struct ip6_tnl *nt = netdev_priv(dev);
2012         struct net *net = dev_net(dev);
2013         struct ip6gre_net *ign;
2014         int err;
2015
2016         ip6gre_netlink_parms(data, &nt->parms);
2017         ign = net_generic(net, ip6gre_net_id);
2018
2019         if (nt->parms.collect_md) {
2020                 if (rtnl_dereference(ign->collect_md_tun))
2021                         return -EEXIST;
2022         } else {
2023                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2024                         return -EEXIST;
2025         }
2026
2027         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2028         if (!err) {
2029                 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2030                 ip6gre_tunnel_link_md(ign, nt);
2031                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2032         }
2033         return err;
2034 }
2035
2036 static struct ip6_tnl *
2037 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2038                          struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2039                          struct netlink_ext_ack *extack)
2040 {
2041         struct ip6_tnl *t, *nt = netdev_priv(dev);
2042         struct net *net = nt->net;
2043         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2044         struct ip_tunnel_encap ipencap;
2045
2046         if (dev == ign->fb_tunnel_dev)
2047                 return ERR_PTR(-EINVAL);
2048
2049         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2050                 int err = ip6_tnl_encap_setup(nt, &ipencap);
2051
2052                 if (err < 0)
2053                         return ERR_PTR(err);
2054         }
2055
2056         ip6gre_netlink_parms(data, p_p);
2057
2058         t = ip6gre_tunnel_locate(net, p_p, 0);
2059
2060         if (t) {
2061                 if (t->dev != dev)
2062                         return ERR_PTR(-EEXIST);
2063         } else {
2064                 t = nt;
2065         }
2066
2067         return t;
2068 }
2069
2070 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2071                              struct nlattr *data[],
2072                              struct netlink_ext_ack *extack)
2073 {
2074         struct ip6_tnl *t = netdev_priv(dev);
2075         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2076         struct __ip6_tnl_parm p;
2077
2078         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2079         if (IS_ERR(t))
2080                 return PTR_ERR(t);
2081
2082         ip6gre_tunnel_unlink_md(ign, t);
2083         ip6gre_tunnel_unlink(ign, t);
2084         ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2085         ip6gre_tunnel_link_md(ign, t);
2086         ip6gre_tunnel_link(ign, t);
2087         return 0;
2088 }
2089
2090 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2091 {
2092         struct net *net = dev_net(dev);
2093         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2094
2095         if (dev != ign->fb_tunnel_dev)
2096                 unregister_netdevice_queue(dev, head);
2097 }
2098
2099 static size_t ip6gre_get_size(const struct net_device *dev)
2100 {
2101         return
2102                 /* IFLA_GRE_LINK */
2103                 nla_total_size(4) +
2104                 /* IFLA_GRE_IFLAGS */
2105                 nla_total_size(2) +
2106                 /* IFLA_GRE_OFLAGS */
2107                 nla_total_size(2) +
2108                 /* IFLA_GRE_IKEY */
2109                 nla_total_size(4) +
2110                 /* IFLA_GRE_OKEY */
2111                 nla_total_size(4) +
2112                 /* IFLA_GRE_LOCAL */
2113                 nla_total_size(sizeof(struct in6_addr)) +
2114                 /* IFLA_GRE_REMOTE */
2115                 nla_total_size(sizeof(struct in6_addr)) +
2116                 /* IFLA_GRE_TTL */
2117                 nla_total_size(1) +
2118                 /* IFLA_GRE_ENCAP_LIMIT */
2119                 nla_total_size(1) +
2120                 /* IFLA_GRE_FLOWINFO */
2121                 nla_total_size(4) +
2122                 /* IFLA_GRE_FLAGS */
2123                 nla_total_size(4) +
2124                 /* IFLA_GRE_ENCAP_TYPE */
2125                 nla_total_size(2) +
2126                 /* IFLA_GRE_ENCAP_FLAGS */
2127                 nla_total_size(2) +
2128                 /* IFLA_GRE_ENCAP_SPORT */
2129                 nla_total_size(2) +
2130                 /* IFLA_GRE_ENCAP_DPORT */
2131                 nla_total_size(2) +
2132                 /* IFLA_GRE_COLLECT_METADATA */
2133                 nla_total_size(0) +
2134                 /* IFLA_GRE_FWMARK */
2135                 nla_total_size(4) +
2136                 /* IFLA_GRE_ERSPAN_INDEX */
2137                 nla_total_size(4) +
2138                 0;
2139 }
2140
2141 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2142 {
2143         struct ip6_tnl *t = netdev_priv(dev);
2144         struct __ip6_tnl_parm *p = &t->parms;
2145         IP_TUNNEL_DECLARE_FLAGS(o_flags);
2146
2147         ip_tunnel_flags_copy(o_flags, p->o_flags);
2148
2149         if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2150                 if (!p->collect_md)
2151                         __set_bit(IP_TUNNEL_KEY_BIT, o_flags);
2152
2153                 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2154                         goto nla_put_failure;
2155
2156                 if (p->erspan_ver == 1) {
2157                         if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2158                                 goto nla_put_failure;
2159                 } else {
2160                         if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2161                                 goto nla_put_failure;
2162                         if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2163                                 goto nla_put_failure;
2164                 }
2165         }
2166
2167         if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2168             nla_put_be16(skb, IFLA_GRE_IFLAGS,
2169                          gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2170             nla_put_be16(skb, IFLA_GRE_OFLAGS,
2171                          gre_tnl_flags_to_gre_flags(o_flags)) ||
2172             nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2173             nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2174             nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2175             nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2176             nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2177             nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2178             nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2179             nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2180             nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2181                 goto nla_put_failure;
2182
2183         if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2184                         t->encap.type) ||
2185             nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2186                          t->encap.sport) ||
2187             nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2188                          t->encap.dport) ||
2189             nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2190                         t->encap.flags))
2191                 goto nla_put_failure;
2192
2193         if (p->collect_md) {
2194                 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2195                         goto nla_put_failure;
2196         }
2197
2198         return 0;
2199
2200 nla_put_failure:
2201         return -EMSGSIZE;
2202 }
2203
2204 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2205         [IFLA_GRE_LINK]        = { .type = NLA_U32 },
2206         [IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2207         [IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2208         [IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2209         [IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2210         [IFLA_GRE_LOCAL]       = { .len = sizeof_field(struct ipv6hdr, saddr) },
2211         [IFLA_GRE_REMOTE]      = { .len = sizeof_field(struct ipv6hdr, daddr) },
2212         [IFLA_GRE_TTL]         = { .type = NLA_U8 },
2213         [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2214         [IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2215         [IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2216         [IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2217         [IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2218         [IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2219         [IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2220         [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2221         [IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2222         [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2223         [IFLA_GRE_ERSPAN_VER]   = { .type = NLA_U8 },
2224         [IFLA_GRE_ERSPAN_DIR]   = { .type = NLA_U8 },
2225         [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
2226 };
2227
2228 static void ip6erspan_tap_setup(struct net_device *dev)
2229 {
2230         ether_setup(dev);
2231
2232         dev->max_mtu = 0;
2233         dev->netdev_ops = &ip6erspan_netdev_ops;
2234         dev->needs_free_netdev = true;
2235         dev->priv_destructor = ip6gre_dev_free;
2236
2237         dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
2238         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2239         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2240         netif_keep_dst(dev);
2241 }
2242
2243 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2244                              struct nlattr *tb[], struct nlattr *data[],
2245                              struct netlink_ext_ack *extack)
2246 {
2247         struct ip6_tnl *nt = netdev_priv(dev);
2248         struct net *net = dev_net(dev);
2249         struct ip6gre_net *ign;
2250         int err;
2251
2252         ip6gre_netlink_parms(data, &nt->parms);
2253         ip6erspan_set_version(data, &nt->parms);
2254         ign = net_generic(net, ip6gre_net_id);
2255
2256         if (nt->parms.collect_md) {
2257                 if (rtnl_dereference(ign->collect_md_tun_erspan))
2258                         return -EEXIST;
2259         } else {
2260                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2261                         return -EEXIST;
2262         }
2263
2264         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2265         if (!err) {
2266                 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2267                 ip6erspan_tunnel_link_md(ign, nt);
2268                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2269         }
2270         return err;
2271 }
2272
2273 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2274 {
2275         ip6gre_tnl_link_config_common(t);
2276         ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2277 }
2278
2279 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2280                                 const struct __ip6_tnl_parm *p, int set_mtu)
2281 {
2282         ip6gre_tnl_copy_tnl_parm(t, p);
2283         ip6erspan_tnl_link_config(t, set_mtu);
2284         return 0;
2285 }
2286
2287 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2288                                 struct nlattr *data[],
2289                                 struct netlink_ext_ack *extack)
2290 {
2291         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2292         struct __ip6_tnl_parm p;
2293         struct ip6_tnl *t;
2294
2295         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2296         if (IS_ERR(t))
2297                 return PTR_ERR(t);
2298
2299         ip6erspan_set_version(data, &p);
2300         ip6gre_tunnel_unlink_md(ign, t);
2301         ip6gre_tunnel_unlink(ign, t);
2302         ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2303         ip6erspan_tunnel_link_md(ign, t);
2304         ip6gre_tunnel_link(ign, t);
2305         return 0;
2306 }
2307
2308 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2309         .kind           = "ip6gre",
2310         .maxtype        = IFLA_GRE_MAX,
2311         .policy         = ip6gre_policy,
2312         .priv_size      = sizeof(struct ip6_tnl),
2313         .setup          = ip6gre_tunnel_setup,
2314         .validate       = ip6gre_tunnel_validate,
2315         .newlink        = ip6gre_newlink,
2316         .changelink     = ip6gre_changelink,
2317         .dellink        = ip6gre_dellink,
2318         .get_size       = ip6gre_get_size,
2319         .fill_info      = ip6gre_fill_info,
2320         .get_link_net   = ip6_tnl_get_link_net,
2321 };
2322
2323 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2324         .kind           = "ip6gretap",
2325         .maxtype        = IFLA_GRE_MAX,
2326         .policy         = ip6gre_policy,
2327         .priv_size      = sizeof(struct ip6_tnl),
2328         .setup          = ip6gre_tap_setup,
2329         .validate       = ip6gre_tap_validate,
2330         .newlink        = ip6gre_newlink,
2331         .changelink     = ip6gre_changelink,
2332         .get_size       = ip6gre_get_size,
2333         .fill_info      = ip6gre_fill_info,
2334         .get_link_net   = ip6_tnl_get_link_net,
2335 };
2336
2337 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2338         .kind           = "ip6erspan",
2339         .maxtype        = IFLA_GRE_MAX,
2340         .policy         = ip6gre_policy,
2341         .priv_size      = sizeof(struct ip6_tnl),
2342         .setup          = ip6erspan_tap_setup,
2343         .validate       = ip6erspan_tap_validate,
2344         .newlink        = ip6erspan_newlink,
2345         .changelink     = ip6erspan_changelink,
2346         .get_size       = ip6gre_get_size,
2347         .fill_info      = ip6gre_fill_info,
2348         .get_link_net   = ip6_tnl_get_link_net,
2349 };
2350
2351 /*
2352  *      And now the modules code and kernel interface.
2353  */
2354
2355 static int __init ip6gre_init(void)
2356 {
2357         int err;
2358
2359         pr_info("GRE over IPv6 tunneling driver\n");
2360
2361         err = register_pernet_device(&ip6gre_net_ops);
2362         if (err < 0)
2363                 return err;
2364
2365         err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2366         if (err < 0) {
2367                 pr_info("%s: can't add protocol\n", __func__);
2368                 goto add_proto_failed;
2369         }
2370
2371         err = rtnl_link_register(&ip6gre_link_ops);
2372         if (err < 0)
2373                 goto rtnl_link_failed;
2374
2375         err = rtnl_link_register(&ip6gre_tap_ops);
2376         if (err < 0)
2377                 goto tap_ops_failed;
2378
2379         err = rtnl_link_register(&ip6erspan_tap_ops);
2380         if (err < 0)
2381                 goto erspan_link_failed;
2382
2383 out:
2384         return err;
2385
2386 erspan_link_failed:
2387         rtnl_link_unregister(&ip6gre_tap_ops);
2388 tap_ops_failed:
2389         rtnl_link_unregister(&ip6gre_link_ops);
2390 rtnl_link_failed:
2391         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2392 add_proto_failed:
2393         unregister_pernet_device(&ip6gre_net_ops);
2394         goto out;
2395 }
2396
2397 static void __exit ip6gre_fini(void)
2398 {
2399         rtnl_link_unregister(&ip6gre_tap_ops);
2400         rtnl_link_unregister(&ip6gre_link_ops);
2401         rtnl_link_unregister(&ip6erspan_tap_ops);
2402         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2403         unregister_pernet_device(&ip6gre_net_ops);
2404 }
2405
2406 module_init(ip6gre_init);
2407 module_exit(ip6gre_fini);
2408 MODULE_LICENSE("GPL");
2409 MODULE_AUTHOR("D. Kozlov <xeb@mail.ru>");
2410 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2411 MODULE_ALIAS_RTNL_LINK("ip6gre");
2412 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2413 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2414 MODULE_ALIAS_NETDEV("ip6gre0");