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                         struct metadata_dst *tun_dst;
 500                         __be64 tun_id;
 501                         __be16 flags;
 502
 503                         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         ipv6h = ipv6_hdr(skb);
 532         ershdr = (struct erspan_base_hdr *)skb->data;
 533         ver = ershdr->ver;
 534
 535         tunnel = ip6gre_tunnel_lookup(skb->dev,
 536                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 537                                       tpi->proto);
 538         if (tunnel) {
 539                 int len = erspan_hdr_len(ver);
 540
 541                 if (unlikely(!pskb_may_pull(skb, len)))
 542                         return PACKET_REJECT;
 543
 544                 if (__iptunnel_pull_header(skb, len,
 545                                            htons(ETH_P_TEB),
 546                                            false, false) < 0)
 547                         return PACKET_REJECT;
 548
 549                 if (tunnel->parms.collect_md) {
 550                         struct erspan_metadata *pkt_md, *md;
 551                         struct metadata_dst *tun_dst;
 552                         struct ip_tunnel_info *info;
 553                         unsigned char *gh;
 554                         __be64 tun_id;
 555                         __be16 flags;
 556
 557                         tpi->flags |= TUNNEL_KEY;
 558                         flags = tpi->flags;
 559                         tun_id = key32_to_tunnel_id(tpi->key);
 560
 561                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
 562                                                   sizeof(*md));
 563                         if (!tun_dst)
 564                                 return PACKET_REJECT;
 565
 566                         /* skb can be uncloned in __iptunnel_pull_header, so
 567                          * old pkt_md is no longer valid and we need to reset
 568                          * it
 569                          */
 570                         gh = skb_network_header(skb) +
 571                              skb_network_header_len(skb);
 572                         pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
 573                                                             sizeof(*ershdr));
 574                         info = &tun_dst->u.tun_info;
 575                         md = ip_tunnel_info_opts(info);
 576                         md->version = ver;
 577                         md2 = &md->u.md2;
 578                         memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
 579                                                        ERSPAN_V2_MDSIZE);
 580                         info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
 581                         info->options_len = sizeof(*md);
 582
 583                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 584
 585                 } else {
 586                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 587                 }
 588
 589                 return PACKET_RCVD;
 590         }
 591
 592         return PACKET_REJECT;
 593 }
 594
 595 static int gre_rcv(struct sk_buff *skb)
 596 {
 597         struct tnl_ptk_info tpi;
 598         bool csum_err = false;
 599         int hdr_len;
 600
 601         hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
 602         if (hdr_len < 0)
 603                 goto drop;
 604
 605         if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 606                 goto drop;
 607
 608         if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
 609                      tpi.proto == htons(ETH_P_ERSPAN2))) {
 610                 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
 611                         return 0;
 612                 goto out;
 613         }
 614
 615         if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 616                 return 0;
 617
 618 out:
 619         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 620 drop:
 621         kfree_skb(skb);
 622         return 0;
 623 }
 624
 625 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 626 {
 627         return iptunnel_handle_offloads(skb,
 628                                         csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 629 }
 630
 631 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
 632                                      struct net_device *dev,
 633                                      struct flowi6 *fl6, __u8 *dsfield,
 634                                      int *encap_limit)
 635 {
 636         const struct iphdr *iph = ip_hdr(skb);
 637         struct ip6_tnl *t = netdev_priv(dev);
 638
 639         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 640                 *encap_limit = t->parms.encap_limit;
 641
 642         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 643
 644         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 645                 *dsfield = ipv4_get_dsfield(iph);
 646         else
 647                 *dsfield = ip6_tclass(t->parms.flowinfo);
 648
 649         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 650                 fl6->flowi6_mark = skb->mark;
 651         else
 652                 fl6->flowi6_mark = t->parms.fwmark;
 653
 654         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 655 }
 656
 657 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
 658                                     struct net_device *dev,
 659                                     struct flowi6 *fl6, __u8 *dsfield,
 660                                     int *encap_limit)
 661 {
 662         struct ipv6hdr *ipv6h;
 663         struct ip6_tnl *t = netdev_priv(dev);
 664         __u16 offset;
 665
 666         offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
 667         /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
 668         ipv6h = ipv6_hdr(skb);
 669
 670         if (offset > 0) {
 671                 struct ipv6_tlv_tnl_enc_lim *tel;
 672
 673                 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
 674                 if (tel->encap_limit == 0) {
 675                         icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
 676                                         ICMPV6_HDR_FIELD, offset + 2);
 677                         return -1;
 678                 }
 679                 *encap_limit = tel->encap_limit - 1;
 680         } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
 681                 *encap_limit = t->parms.encap_limit;
 682         }
 683
 684         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 685
 686         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 687                 *dsfield = ipv6_get_dsfield(ipv6h);
 688         else
 689                 *dsfield = ip6_tclass(t->parms.flowinfo);
 690
 691         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 692                 fl6->flowlabel |= ip6_flowlabel(ipv6h);
 693
 694         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 695                 fl6->flowi6_mark = skb->mark;
 696         else
 697                 fl6->flowi6_mark = t->parms.fwmark;
 698
 699         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 700
 701         return 0;
 702 }
 703
 704 static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
 705                                      struct net_device *dev,
 706                                      struct flowi6 *fl6, __u8 *dsfield,
 707                                      int *encap_limit)
 708 {
 709         struct ip6_tnl *t = netdev_priv(dev);
 710
 711         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 712                 *encap_limit = t->parms.encap_limit;
 713
 714         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 715
 716         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 717                 *dsfield = 0;
 718         else
 719                 *dsfield = ip6_tclass(t->parms.flowinfo);
 720
 721         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 722                 fl6->flowi6_mark = skb->mark;
 723         else
 724                 fl6->flowi6_mark = t->parms.fwmark;
 725
 726         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 727
 728         return 0;
 729 }
 730
 731 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
 732 {
 733         struct ip_tunnel_info *tun_info;
 734
 735         tun_info = skb_tunnel_info(skb);
 736         if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
 737                 return ERR_PTR(-EINVAL);
 738
 739         return tun_info;
 740 }
 741
 742 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
 743                                struct net_device *dev, __u8 dsfield,
 744                                struct flowi6 *fl6, int encap_limit,
 745                                __u32 *pmtu, __be16 proto)
 746 {
 747         struct ip6_tnl *tunnel = netdev_priv(dev);
 748         __be16 protocol;
 749         __be16 flags;
 750
 751         if (dev->type == ARPHRD_ETHER)
 752                 IPCB(skb)->flags = 0;
 753
 754         if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
 755                 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
 756         else
 757                 fl6->daddr = tunnel->parms.raddr;
 758
 759         /* Push GRE header. */
 760         protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
 761
 762         if (tunnel->parms.collect_md) {
 763                 struct ip_tunnel_info *tun_info;
 764                 const struct ip_tunnel_key *key;
 765                 int tun_hlen;
 766
 767                 tun_info = skb_tunnel_info_txcheck(skb);
 768                 if (IS_ERR(tun_info) ||
 769                     unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
 770                         return -EINVAL;
 771
 772                 key = &tun_info->key;
 773                 memset(fl6, 0, sizeof(*fl6));
 774                 fl6->flowi6_proto = IPPROTO_GRE;
 775                 fl6->daddr = key->u.ipv6.dst;
 776                 fl6->flowlabel = key->label;
 777                 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 778                 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
 779
 780                 dsfield = key->tos;
 781                 flags = key->tun_flags &
 782                         (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
 783                 tun_hlen = gre_calc_hlen(flags);
 784
 785                 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
 786                         return -ENOMEM;
 787
 788                 gre_build_header(skb, tun_hlen,
 789                                  flags, protocol,
 790                                  tunnel_id_to_key32(tun_info->key.tun_id),
 791                                  (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
 792                                                       : 0);
 793
 794         } else {
 795                 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
 796                         return -ENOMEM;
 797
 798                 flags = tunnel->parms.o_flags;
 799
 800                 gre_build_header(skb, tunnel->tun_hlen, flags,
 801                                  protocol, tunnel->parms.o_key,
 802                                  (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
 803                                                       : 0);
 804         }
 805
 806         return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
 807                             NEXTHDR_GRE);
 808 }
 809
 810 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
 811 {
 812         struct ip6_tnl *t = netdev_priv(dev);
 813         int encap_limit = -1;
 814         struct flowi6 fl6;
 815         __u8 dsfield = 0;
 816         __u32 mtu;
 817         int err;
 818
 819         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 820
 821         if (!t->parms.collect_md)
 822                 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
 823                                          &dsfield, &encap_limit);
 824
 825         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 826         if (err)
 827                 return -1;
 828
 829         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
 830                           skb->protocol);
 831         if (err != 0) {
 832                 /* XXX: send ICMP error even if DF is not set. */
 833                 if (err == -EMSGSIZE)
 834                         icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 835                                       htonl(mtu));
 836                 return -1;
 837         }
 838
 839         return 0;
 840 }
 841
 842 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
 843 {
 844         struct ip6_tnl *t = netdev_priv(dev);
 845         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 846         int encap_limit = -1;
 847         struct flowi6 fl6;
 848         __u8 dsfield = 0;
 849         __u32 mtu;
 850         int err;
 851
 852         if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
 853                 return -1;
 854
 855         if (!t->parms.collect_md &&
 856             prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
 857                 return -1;
 858
 859         if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
 860                 return -1;
 861
 862         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
 863                           &mtu, skb->protocol);
 864         if (err != 0) {
 865                 if (err == -EMSGSIZE)
 866                         icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 867                 return -1;
 868         }
 869
 870         return 0;
 871 }
 872
 873 /**
 874  * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
 875  *   @t: the outgoing tunnel device
 876  *   @hdr: IPv6 header from the incoming packet
 877  *
 878  * Description:
 879  *   Avoid trivial tunneling loop by checking that tunnel exit-point
 880  *   doesn't match source of incoming packet.
 881  *
 882  * Return:
 883  *   1 if conflict,
 884  *   0 else
 885  **/
 886
 887 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
 888         const struct ipv6hdr *hdr)
 889 {
 890         return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
 891 }
 892
 893 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
 894 {
 895         struct ip6_tnl *t = netdev_priv(dev);
 896         int encap_limit = -1;
 897         struct flowi6 fl6;
 898         __u8 dsfield = 0;
 899         __u32 mtu;
 900         int err;
 901
 902         if (!t->parms.collect_md &&
 903             prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
 904                 return -1;
 905
 906         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 907         if (err)
 908                 return err;
 909         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
 910
 911         return err;
 912 }
 913
 914 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
 915         struct net_device *dev)
 916 {
 917         struct ip6_tnl *t = netdev_priv(dev);
 918         struct net_device_stats *stats = &t->dev->stats;
 919         __be16 payload_protocol;
 920         int ret;
 921
 922         if (!pskb_inet_may_pull(skb))
 923                 goto tx_err;
 924
 925         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 926                 goto tx_err;
 927
 928         payload_protocol = skb_protocol(skb, true);
 929         switch (payload_protocol) {
 930         case htons(ETH_P_IP):
 931                 ret = ip6gre_xmit_ipv4(skb, dev);
 932                 break;
 933         case htons(ETH_P_IPV6):
 934                 ret = ip6gre_xmit_ipv6(skb, dev);
 935                 break;
 936         default:
 937                 ret = ip6gre_xmit_other(skb, dev);
 938                 break;
 939         }
 940
 941         if (ret < 0)
 942                 goto tx_err;
 943
 944         return NETDEV_TX_OK;
 945
 946 tx_err:
 947         if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
 948                 stats->tx_errors++;
 949         stats->tx_dropped++;
 950         kfree_skb(skb);
 951         return NETDEV_TX_OK;
 952 }
 953
 954 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 955                                          struct net_device *dev)
 956 {
 957         struct ip_tunnel_info *tun_info = NULL;
 958         struct ip6_tnl *t = netdev_priv(dev);
 959         struct dst_entry *dst = skb_dst(skb);
 960         struct net_device_stats *stats;
 961         bool truncate = false;
 962         int encap_limit = -1;
 963         __u8 dsfield = false;
 964         struct flowi6 fl6;
 965         int err = -EINVAL;
 966         __be16 proto;
 967         __u32 mtu;
 968         int nhoff;
 969
 970         if (!pskb_inet_may_pull(skb))
 971                 goto tx_err;
 972
 973         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 974                 goto tx_err;
 975
 976         if (gre_handle_offloads(skb, false))
 977                 goto tx_err;
 978
 979         if (skb->len > dev->mtu + dev->hard_header_len) {
 980                 pskb_trim(skb, dev->mtu + dev->hard_header_len);
 981                 truncate = true;
 982         }
 983
 984         nhoff = skb_network_offset(skb);
 985         if (skb->protocol == htons(ETH_P_IP) &&
 986             (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
 987                 truncate = true;
 988
 989         if (skb->protocol == htons(ETH_P_IPV6)) {
 990                 int thoff;
 991
 992                 if (skb_transport_header_was_set(skb))
 993                         thoff = skb_transport_offset(skb);
 994                 else
 995                         thoff = nhoff + sizeof(struct ipv6hdr);
 996                 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
 997                         truncate = true;
 998         }
 999
1000         if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
1001                 goto tx_err;
1002
1003         t->parms.o_flags &= ~TUNNEL_KEY;
1004         IPCB(skb)->flags = 0;
1005
1006         /* For collect_md mode, derive fl6 from the tunnel key,
1007          * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
1008          */
1009         if (t->parms.collect_md) {
1010                 const struct ip_tunnel_key *key;
1011                 struct erspan_metadata *md;
1012                 __be32 tun_id;
1013
1014                 tun_info = skb_tunnel_info_txcheck(skb);
1015                 if (IS_ERR(tun_info) ||
1016                     unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
1017                         goto tx_err;
1018
1019                 key = &tun_info->key;
1020                 memset(&fl6, 0, sizeof(fl6));
1021                 fl6.flowi6_proto = IPPROTO_GRE;
1022                 fl6.daddr = key->u.ipv6.dst;
1023                 fl6.flowlabel = key->label;
1024                 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1025                 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1026
1027                 dsfield = key->tos;
1028                 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1029                         goto tx_err;
1030                 if (tun_info->options_len < sizeof(*md))
1031                         goto tx_err;
1032                 md = ip_tunnel_info_opts(tun_info);
1033
1034                 tun_id = tunnel_id_to_key32(key->tun_id);
1035                 if (md->version == 1) {
1036                         erspan_build_header(skb,
1037                                             ntohl(tun_id),
1038                                             ntohl(md->u.index), truncate,
1039                                             false);
1040                 } else if (md->version == 2) {
1041                         erspan_build_header_v2(skb,
1042                                                ntohl(tun_id),
1043                                                md->u.md2.dir,
1044                                                get_hwid(&md->u.md2),
1045                                                truncate, false);
1046                 } else {
1047                         goto tx_err;
1048                 }
1049         } else {
1050                 switch (skb->protocol) {
1051                 case htons(ETH_P_IP):
1052                         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1053                         prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1054                                                  &dsfield, &encap_limit);
1055                         break;
1056                 case htons(ETH_P_IPV6):
1057                         if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1058                                 goto tx_err;
1059                         if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1060                                                      &dsfield, &encap_limit))
1061                                 goto tx_err;
1062                         break;
1063                 default:
1064                         memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1065                         break;
1066                 }
1067
1068                 if (t->parms.erspan_ver == 1)
1069                         erspan_build_header(skb, ntohl(t->parms.o_key),
1070                                             t->parms.index,
1071                                             truncate, false);
1072                 else if (t->parms.erspan_ver == 2)
1073                         erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1074                                                t->parms.dir,
1075                                                t->parms.hwid,
1076                                                truncate, false);
1077                 else
1078                         goto tx_err;
1079
1080                 fl6.daddr = t->parms.raddr;
1081         }
1082
1083         /* Push GRE header. */
1084         proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1085                                            : htons(ETH_P_ERSPAN2);
1086         gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1087
1088         /* TooBig packet may have updated dst->dev's mtu */
1089         if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1090                 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1091
1092         err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1093                            NEXTHDR_GRE);
1094         if (err != 0) {
1095                 /* XXX: send ICMP error even if DF is not set. */
1096                 if (err == -EMSGSIZE) {
1097                         if (skb->protocol == htons(ETH_P_IP))
1098                                 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1099                                               ICMP_FRAG_NEEDED, htonl(mtu));
1100                         else
1101                                 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1102                 }
1103
1104                 goto tx_err;
1105         }
1106         return NETDEV_TX_OK;
1107
1108 tx_err:
1109         stats = &t->dev->stats;
1110         if (!IS_ERR(tun_info))
1111                 stats->tx_errors++;
1112         stats->tx_dropped++;
1113         kfree_skb(skb);
1114         return NETDEV_TX_OK;
1115 }
1116
1117 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1118 {
1119         struct net_device *dev = t->dev;
1120         struct __ip6_tnl_parm *p = &t->parms;
1121         struct flowi6 *fl6 = &t->fl.u.ip6;
1122
1123         if (dev->type != ARPHRD_ETHER) {
1124                 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1125                 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1126         }
1127
1128         /* Set up flowi template */
1129         fl6->saddr = p->laddr;
1130         fl6->daddr = p->raddr;
1131         fl6->flowi6_oif = p->link;
1132         fl6->flowlabel = 0;
1133         fl6->flowi6_proto = IPPROTO_GRE;
1134         fl6->fl6_gre_key = t->parms.o_key;
1135
1136         if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1137                 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1138         if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1139                 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1140
1141         p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1142         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1143
1144         if (p->flags&IP6_TNL_F_CAP_XMIT &&
1145                         p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1146                 dev->flags |= IFF_POINTOPOINT;
1147         else
1148                 dev->flags &= ~IFF_POINTOPOINT;
1149 }
1150
1151 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1152                                          int t_hlen)
1153 {
1154         const struct __ip6_tnl_parm *p = &t->parms;
1155         struct net_device *dev = t->dev;
1156
1157         if (p->flags & IP6_TNL_F_CAP_XMIT) {
1158                 int strict = (ipv6_addr_type(&p->raddr) &
1159                               (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1160
1161                 struct rt6_info *rt = rt6_lookup(t->net,
1162                                                  &p->raddr, &p->laddr,
1163                                                  p->link, NULL, strict);
1164
1165                 if (!rt)
1166                         return;
1167
1168                 if (rt->dst.dev) {
1169                         unsigned short dst_len = rt->dst.dev->hard_header_len +
1170                                                  t_hlen;
1171
1172                         if (t->dev->header_ops)
1173                                 dev->hard_header_len = dst_len;
1174                         else
1175                                 dev->needed_headroom = dst_len;
1176
1177                         if (set_mtu) {
1178                                 int mtu = rt->dst.dev->mtu - t_hlen;
1179
1180                                 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1181                                         mtu -= 8;
1182                                 if (dev->type == ARPHRD_ETHER)
1183                                         mtu -= ETH_HLEN;
1184
1185                                 if (mtu < IPV6_MIN_MTU)
1186                                         mtu = IPV6_MIN_MTU;
1187                                 WRITE_ONCE(dev->mtu, mtu);
1188                         }
1189                 }
1190                 ip6_rt_put(rt);
1191         }
1192 }
1193
1194 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1195 {
1196         int t_hlen;
1197
1198         tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1199         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1200
1201         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1202
1203         if (tunnel->dev->header_ops)
1204                 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1205         else
1206                 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1207
1208         return t_hlen;
1209 }
1210
1211 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1212 {
1213         ip6gre_tnl_link_config_common(t);
1214         ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1215 }
1216
1217 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1218                                      const struct __ip6_tnl_parm *p)
1219 {
1220         t->parms.laddr = p->laddr;
1221         t->parms.raddr = p->raddr;
1222         t->parms.flags = p->flags;
1223         t->parms.hop_limit = p->hop_limit;
1224         t->parms.encap_limit = p->encap_limit;
1225         t->parms.flowinfo = p->flowinfo;
1226         t->parms.link = p->link;
1227         t->parms.proto = p->proto;
1228         t->parms.i_key = p->i_key;
1229         t->parms.o_key = p->o_key;
1230         t->parms.i_flags = p->i_flags;
1231         t->parms.o_flags = p->o_flags;
1232         t->parms.fwmark = p->fwmark;
1233         t->parms.erspan_ver = p->erspan_ver;
1234         t->parms.index = p->index;
1235         t->parms.dir = p->dir;
1236         t->parms.hwid = p->hwid;
1237         dst_cache_reset(&t->dst_cache);
1238 }
1239
1240 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1241                              int set_mtu)
1242 {
1243         ip6gre_tnl_copy_tnl_parm(t, p);
1244         ip6gre_tnl_link_config(t, set_mtu);
1245         return 0;
1246 }
1247
1248 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1249         const struct ip6_tnl_parm2 *u)
1250 {
1251         p->laddr = u->laddr;
1252         p->raddr = u->raddr;
1253         p->flags = u->flags;
1254         p->hop_limit = u->hop_limit;
1255         p->encap_limit = u->encap_limit;
1256         p->flowinfo = u->flowinfo;
1257         p->link = u->link;
1258         p->i_key = u->i_key;
1259         p->o_key = u->o_key;
1260         p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1261         p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1262         memcpy(p->name, u->name, sizeof(u->name));
1263 }
1264
1265 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1266         const struct __ip6_tnl_parm *p)
1267 {
1268         u->proto = IPPROTO_GRE;
1269         u->laddr = p->laddr;
1270         u->raddr = p->raddr;
1271         u->flags = p->flags;
1272         u->hop_limit = p->hop_limit;
1273         u->encap_limit = p->encap_limit;
1274         u->flowinfo = p->flowinfo;
1275         u->link = p->link;
1276         u->i_key = p->i_key;
1277         u->o_key = p->o_key;
1278         u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1279         u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1280         memcpy(u->name, p->name, sizeof(u->name));
1281 }
1282
1283 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1284                                         struct ifreq *ifr, void __user *data,
1285                                         int cmd)
1286 {
1287         int err = 0;
1288         struct ip6_tnl_parm2 p;
1289         struct __ip6_tnl_parm p1;
1290         struct ip6_tnl *t = netdev_priv(dev);
1291         struct net *net = t->net;
1292         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1293
1294         memset(&p1, 0, sizeof(p1));
1295
1296         switch (cmd) {
1297         case SIOCGETTUNNEL:
1298                 if (dev == ign->fb_tunnel_dev) {
1299                         if (copy_from_user(&p, data, sizeof(p))) {
1300                                 err = -EFAULT;
1301                                 break;
1302                         }
1303                         ip6gre_tnl_parm_from_user(&p1, &p);
1304                         t = ip6gre_tunnel_locate(net, &p1, 0);
1305                         if (!t)
1306                                 t = netdev_priv(dev);
1307                 }
1308                 memset(&p, 0, sizeof(p));
1309                 ip6gre_tnl_parm_to_user(&p, &t->parms);
1310                 if (copy_to_user(data, &p, sizeof(p)))
1311                         err = -EFAULT;
1312                 break;
1313
1314         case SIOCADDTUNNEL:
1315         case SIOCCHGTUNNEL:
1316                 err = -EPERM;
1317                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1318                         goto done;
1319
1320                 err = -EFAULT;
1321                 if (copy_from_user(&p, data, sizeof(p)))
1322                         goto done;
1323
1324                 err = -EINVAL;
1325                 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1326                         goto done;
1327
1328                 if (!(p.i_flags&GRE_KEY))
1329                         p.i_key = 0;
1330                 if (!(p.o_flags&GRE_KEY))
1331                         p.o_key = 0;
1332
1333                 ip6gre_tnl_parm_from_user(&p1, &p);
1334                 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1335
1336                 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1337                         if (t) {
1338                                 if (t->dev != dev) {
1339                                         err = -EEXIST;
1340                                         break;
1341                                 }
1342                         } else {
1343                                 t = netdev_priv(dev);
1344
1345                                 ip6gre_tunnel_unlink(ign, t);
1346                                 synchronize_net();
1347                                 ip6gre_tnl_change(t, &p1, 1);
1348                                 ip6gre_tunnel_link(ign, t);
1349                                 netdev_state_change(dev);
1350                         }
1351                 }
1352
1353                 if (t) {
1354                         err = 0;
1355
1356                         memset(&p, 0, sizeof(p));
1357                         ip6gre_tnl_parm_to_user(&p, &t->parms);
1358                         if (copy_to_user(data, &p, sizeof(p)))
1359                                 err = -EFAULT;
1360                 } else
1361                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1362                 break;
1363
1364         case SIOCDELTUNNEL:
1365                 err = -EPERM;
1366                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1367                         goto done;
1368
1369                 if (dev == ign->fb_tunnel_dev) {
1370                         err = -EFAULT;
1371                         if (copy_from_user(&p, data, sizeof(p)))
1372                                 goto done;
1373                         err = -ENOENT;
1374                         ip6gre_tnl_parm_from_user(&p1, &p);
1375                         t = ip6gre_tunnel_locate(net, &p1, 0);
1376                         if (!t)
1377                                 goto done;
1378                         err = -EPERM;
1379                         if (t == netdev_priv(ign->fb_tunnel_dev))
1380                                 goto done;
1381                         dev = t->dev;
1382                 }
1383                 unregister_netdevice(dev);
1384                 err = 0;
1385                 break;
1386
1387         default:
1388                 err = -EINVAL;
1389         }
1390
1391 done:
1392         return err;
1393 }
1394
1395 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1396                          unsigned short type, const void *daddr,
1397                          const void *saddr, unsigned int len)
1398 {
1399         struct ip6_tnl *t = netdev_priv(dev);
1400         struct ipv6hdr *ipv6h;
1401         __be16 *p;
1402
1403         ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1404         ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1405                                                   t->fl.u.ip6.flowlabel,
1406                                                   true, &t->fl.u.ip6));
1407         ipv6h->hop_limit = t->parms.hop_limit;
1408         ipv6h->nexthdr = NEXTHDR_GRE;
1409         ipv6h->saddr = t->parms.laddr;
1410         ipv6h->daddr = t->parms.raddr;
1411
1412         p = (__be16 *)(ipv6h + 1);
1413         p[0] = t->parms.o_flags;
1414         p[1] = htons(type);
1415
1416         /*
1417          *      Set the source hardware address.
1418          */
1419
1420         if (saddr)
1421                 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1422         if (daddr)
1423                 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1424         if (!ipv6_addr_any(&ipv6h->daddr))
1425                 return t->hlen;
1426
1427         return -t->hlen;
1428 }
1429
1430 static const struct header_ops ip6gre_header_ops = {
1431         .create = ip6gre_header,
1432 };
1433
1434 static const struct net_device_ops ip6gre_netdev_ops = {
1435         .ndo_init               = ip6gre_tunnel_init,
1436         .ndo_uninit             = ip6gre_tunnel_uninit,
1437         .ndo_start_xmit         = ip6gre_tunnel_xmit,
1438         .ndo_siocdevprivate     = ip6gre_tunnel_siocdevprivate,
1439         .ndo_change_mtu         = ip6_tnl_change_mtu,
1440         .ndo_get_stats64        = dev_get_tstats64,
1441         .ndo_get_iflink         = ip6_tnl_get_iflink,
1442 };
1443
1444 static void ip6gre_dev_free(struct net_device *dev)
1445 {
1446         struct ip6_tnl *t = netdev_priv(dev);
1447
1448         gro_cells_destroy(&t->gro_cells);
1449         dst_cache_destroy(&t->dst_cache);
1450         free_percpu(dev->tstats);
1451 }
1452
1453 static void ip6gre_tunnel_setup(struct net_device *dev)
1454 {
1455         dev->netdev_ops = &ip6gre_netdev_ops;
1456         dev->needs_free_netdev = true;
1457         dev->priv_destructor = ip6gre_dev_free;
1458
1459         dev->type = ARPHRD_IP6GRE;
1460
1461         dev->flags |= IFF_NOARP;
1462         dev->addr_len = sizeof(struct in6_addr);
1463         netif_keep_dst(dev);
1464         /* This perm addr will be used as interface identifier by IPv6 */
1465         dev->addr_assign_type = NET_ADDR_RANDOM;
1466         eth_random_addr(dev->perm_addr);
1467 }
1468
1469 #define GRE6_FEATURES (NETIF_F_SG |             \
1470                        NETIF_F_FRAGLIST |       \
1471                        NETIF_F_HIGHDMA |        \
1472                        NETIF_F_HW_CSUM)
1473
1474 static void ip6gre_tnl_init_features(struct net_device *dev)
1475 {
1476         struct ip6_tnl *nt = netdev_priv(dev);
1477         __be16 flags;
1478
1479         dev->features           |= GRE6_FEATURES | NETIF_F_LLTX;
1480         dev->hw_features        |= GRE6_FEATURES;
1481
1482         flags = nt->parms.o_flags;
1483
1484         /* TCP offload with GRE SEQ is not supported, nor can we support 2
1485          * levels of outer headers requiring an update.
1486          */
1487         if (flags & TUNNEL_SEQ)
1488                 return;
1489         if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE)
1490                 return;
1491
1492         dev->features |= NETIF_F_GSO_SOFTWARE;
1493         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1494 }
1495
1496 static int ip6gre_tunnel_init_common(struct net_device *dev)
1497 {
1498         struct ip6_tnl *tunnel;
1499         int ret;
1500         int t_hlen;
1501
1502         tunnel = netdev_priv(dev);
1503
1504         tunnel->dev = dev;
1505         tunnel->net = dev_net(dev);
1506         strcpy(tunnel->parms.name, dev->name);
1507
1508         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1509         if (!dev->tstats)
1510                 return -ENOMEM;
1511
1512         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1513         if (ret)
1514                 goto cleanup_alloc_pcpu_stats;
1515
1516         ret = gro_cells_init(&tunnel->gro_cells, dev);
1517         if (ret)
1518                 goto cleanup_dst_cache_init;
1519
1520         t_hlen = ip6gre_calc_hlen(tunnel);
1521         dev->mtu = ETH_DATA_LEN - t_hlen;
1522         if (dev->type == ARPHRD_ETHER)
1523                 dev->mtu -= ETH_HLEN;
1524         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1525                 dev->mtu -= 8;
1526
1527         if (tunnel->parms.collect_md) {
1528                 netif_keep_dst(dev);
1529         }
1530         ip6gre_tnl_init_features(dev);
1531
1532         netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1533         return 0;
1534
1535 cleanup_dst_cache_init:
1536         dst_cache_destroy(&tunnel->dst_cache);
1537 cleanup_alloc_pcpu_stats:
1538         free_percpu(dev->tstats);
1539         dev->tstats = NULL;
1540         return ret;
1541 }
1542
1543 static int ip6gre_tunnel_init(struct net_device *dev)
1544 {
1545         struct ip6_tnl *tunnel;
1546         int ret;
1547
1548         ret = ip6gre_tunnel_init_common(dev);
1549         if (ret)
1550                 return ret;
1551
1552         tunnel = netdev_priv(dev);
1553
1554         if (tunnel->parms.collect_md)
1555                 return 0;
1556
1557         __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1558         memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1559
1560         if (ipv6_addr_any(&tunnel->parms.raddr))
1561                 dev->header_ops = &ip6gre_header_ops;
1562
1563         return 0;
1564 }
1565
1566 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1567 {
1568         struct ip6_tnl *tunnel = netdev_priv(dev);
1569
1570         tunnel->dev = dev;
1571         tunnel->net = dev_net(dev);
1572         strcpy(tunnel->parms.name, dev->name);
1573
1574         tunnel->hlen            = sizeof(struct ipv6hdr) + 4;
1575 }
1576
1577 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1578         .handler     = gre_rcv,
1579         .err_handler = ip6gre_err,
1580         .flags       = INET6_PROTO_FINAL,
1581 };
1582
1583 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1584 {
1585         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1586         struct net_device *dev, *aux;
1587         int prio;
1588
1589         for_each_netdev_safe(net, dev, aux)
1590                 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1591                     dev->rtnl_link_ops == &ip6gre_tap_ops ||
1592                     dev->rtnl_link_ops == &ip6erspan_tap_ops)
1593                         unregister_netdevice_queue(dev, head);
1594
1595         for (prio = 0; prio < 4; prio++) {
1596                 int h;
1597                 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1598                         struct ip6_tnl *t;
1599
1600                         t = rtnl_dereference(ign->tunnels[prio][h]);
1601
1602                         while (t) {
1603                                 /* If dev is in the same netns, it has already
1604                                  * been added to the list by the previous loop.
1605                                  */
1606                                 if (!net_eq(dev_net(t->dev), net))
1607                                         unregister_netdevice_queue(t->dev,
1608                                                                    head);
1609                                 t = rtnl_dereference(t->next);
1610                         }
1611                 }
1612         }
1613 }
1614
1615 static int __net_init ip6gre_init_net(struct net *net)
1616 {
1617         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1618         struct net_device *ndev;
1619         int err;
1620
1621         if (!net_has_fallback_tunnels(net))
1622                 return 0;
1623         ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1624                             NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1625         if (!ndev) {
1626                 err = -ENOMEM;
1627                 goto err_alloc_dev;
1628         }
1629         ign->fb_tunnel_dev = ndev;
1630         dev_net_set(ign->fb_tunnel_dev, net);
1631         /* FB netdevice is special: we have one, and only one per netns.
1632          * Allowing to move it to another netns is clearly unsafe.
1633          */
1634         ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1635
1636
1637         ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1638         ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1639
1640         err = register_netdev(ign->fb_tunnel_dev);
1641         if (err)
1642                 goto err_reg_dev;
1643
1644         rcu_assign_pointer(ign->tunnels_wc[0],
1645                            netdev_priv(ign->fb_tunnel_dev));
1646         return 0;
1647
1648 err_reg_dev:
1649         free_netdev(ndev);
1650 err_alloc_dev:
1651         return err;
1652 }
1653
1654 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1655 {
1656         struct net *net;
1657         LIST_HEAD(list);
1658
1659         rtnl_lock();
1660         list_for_each_entry(net, net_list, exit_list)
1661                 ip6gre_destroy_tunnels(net, &list);
1662         unregister_netdevice_many(&list);
1663         rtnl_unlock();
1664 }
1665
1666 static struct pernet_operations ip6gre_net_ops = {
1667         .init = ip6gre_init_net,
1668         .exit_batch = ip6gre_exit_batch_net,
1669         .id   = &ip6gre_net_id,
1670         .size = sizeof(struct ip6gre_net),
1671 };
1672
1673 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1674                                   struct netlink_ext_ack *extack)
1675 {
1676         __be16 flags;
1677
1678         if (!data)
1679                 return 0;
1680
1681         flags = 0;
1682         if (data[IFLA_GRE_IFLAGS])
1683                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1684         if (data[IFLA_GRE_OFLAGS])
1685                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1686         if (flags & (GRE_VERSION|GRE_ROUTING))
1687                 return -EINVAL;
1688
1689         return 0;
1690 }
1691
1692 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1693                                struct netlink_ext_ack *extack)
1694 {
1695         struct in6_addr daddr;
1696
1697         if (tb[IFLA_ADDRESS]) {
1698                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1699                         return -EINVAL;
1700                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1701                         return -EADDRNOTAVAIL;
1702         }
1703
1704         if (!data)
1705                 goto out;
1706
1707         if (data[IFLA_GRE_REMOTE]) {
1708                 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1709                 if (ipv6_addr_any(&daddr))
1710                         return -EINVAL;
1711         }
1712
1713 out:
1714         return ip6gre_tunnel_validate(tb, data, extack);
1715 }
1716
1717 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1718                                   struct netlink_ext_ack *extack)
1719 {
1720         __be16 flags = 0;
1721         int ret, ver = 0;
1722
1723         if (!data)
1724                 return 0;
1725
1726         ret = ip6gre_tap_validate(tb, data, extack);
1727         if (ret)
1728                 return ret;
1729
1730         /* ERSPAN should only have GRE sequence and key flag */
1731         if (data[IFLA_GRE_OFLAGS])
1732                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1733         if (data[IFLA_GRE_IFLAGS])
1734                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1735         if (!data[IFLA_GRE_COLLECT_METADATA] &&
1736             flags != (GRE_SEQ | GRE_KEY))
1737                 return -EINVAL;
1738
1739         /* ERSPAN Session ID only has 10-bit. Since we reuse
1740          * 32-bit key field as ID, check it's range.
1741          */
1742         if (data[IFLA_GRE_IKEY] &&
1743             (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1744                 return -EINVAL;
1745
1746         if (data[IFLA_GRE_OKEY] &&
1747             (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1748                 return -EINVAL;
1749
1750         if (data[IFLA_GRE_ERSPAN_VER]) {
1751                 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1752                 if (ver != 1 && ver != 2)
1753                         return -EINVAL;
1754         }
1755
1756         if (ver == 1) {
1757                 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1758                         u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1759
1760                         if (index & ~INDEX_MASK)
1761                                 return -EINVAL;
1762                 }
1763         } else if (ver == 2) {
1764                 if (data[IFLA_GRE_ERSPAN_DIR]) {
1765                         u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1766
1767                         if (dir & ~(DIR_MASK >> DIR_OFFSET))
1768                                 return -EINVAL;
1769                 }
1770
1771                 if (data[IFLA_GRE_ERSPAN_HWID]) {
1772                         u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1773
1774                         if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1775                                 return -EINVAL;
1776                 }
1777         }
1778
1779         return 0;
1780 }
1781
1782 static void ip6erspan_set_version(struct nlattr *data[],
1783                                   struct __ip6_tnl_parm *parms)
1784 {
1785         if (!data)
1786                 return;
1787
1788         parms->erspan_ver = 1;
1789         if (data[IFLA_GRE_ERSPAN_VER])
1790                 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1791
1792         if (parms->erspan_ver == 1) {
1793                 if (data[IFLA_GRE_ERSPAN_INDEX])
1794                         parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1795         } else if (parms->erspan_ver == 2) {
1796                 if (data[IFLA_GRE_ERSPAN_DIR])
1797                         parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1798                 if (data[IFLA_GRE_ERSPAN_HWID])
1799                         parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1800         }
1801 }
1802
1803 static void ip6gre_netlink_parms(struct nlattr *data[],
1804                                 struct __ip6_tnl_parm *parms)
1805 {
1806         memset(parms, 0, sizeof(*parms));
1807
1808         if (!data)
1809                 return;
1810
1811         if (data[IFLA_GRE_LINK])
1812                 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1813
1814         if (data[IFLA_GRE_IFLAGS])
1815                 parms->i_flags = gre_flags_to_tnl_flags(
1816                                 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1817
1818         if (data[IFLA_GRE_OFLAGS])
1819                 parms->o_flags = gre_flags_to_tnl_flags(
1820                                 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1821
1822         if (data[IFLA_GRE_IKEY])
1823                 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1824
1825         if (data[IFLA_GRE_OKEY])
1826                 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1827
1828         if (data[IFLA_GRE_LOCAL])
1829                 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1830
1831         if (data[IFLA_GRE_REMOTE])
1832                 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1833
1834         if (data[IFLA_GRE_TTL])
1835                 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1836
1837         if (data[IFLA_GRE_ENCAP_LIMIT])
1838                 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1839
1840         if (data[IFLA_GRE_FLOWINFO])
1841                 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1842
1843         if (data[IFLA_GRE_FLAGS])
1844                 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1845
1846         if (data[IFLA_GRE_FWMARK])
1847                 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1848
1849         if (data[IFLA_GRE_COLLECT_METADATA])
1850                 parms->collect_md = true;
1851 }
1852
1853 static int ip6gre_tap_init(struct net_device *dev)
1854 {
1855         int ret;
1856
1857         ret = ip6gre_tunnel_init_common(dev);
1858         if (ret)
1859                 return ret;
1860
1861         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1862
1863         return 0;
1864 }
1865
1866 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1867         .ndo_init = ip6gre_tap_init,
1868         .ndo_uninit = ip6gre_tunnel_uninit,
1869         .ndo_start_xmit = ip6gre_tunnel_xmit,
1870         .ndo_set_mac_address = eth_mac_addr,
1871         .ndo_validate_addr = eth_validate_addr,
1872         .ndo_change_mtu = ip6_tnl_change_mtu,
1873         .ndo_get_stats64 = dev_get_tstats64,
1874         .ndo_get_iflink = ip6_tnl_get_iflink,
1875 };
1876
1877 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1878 {
1879         int t_hlen;
1880
1881         tunnel->tun_hlen = 8;
1882         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1883                        erspan_hdr_len(tunnel->parms.erspan_ver);
1884
1885         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1886         tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1887         return t_hlen;
1888 }
1889
1890 static int ip6erspan_tap_init(struct net_device *dev)
1891 {
1892         struct ip6_tnl *tunnel;
1893         int t_hlen;
1894         int ret;
1895
1896         tunnel = netdev_priv(dev);
1897
1898         tunnel->dev = dev;
1899         tunnel->net = dev_net(dev);
1900         strcpy(tunnel->parms.name, dev->name);
1901
1902         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1903         if (!dev->tstats)
1904                 return -ENOMEM;
1905
1906         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1907         if (ret)
1908                 goto cleanup_alloc_pcpu_stats;
1909
1910         ret = gro_cells_init(&tunnel->gro_cells, dev);
1911         if (ret)
1912                 goto cleanup_dst_cache_init;
1913
1914         t_hlen = ip6erspan_calc_hlen(tunnel);
1915         dev->mtu = ETH_DATA_LEN - t_hlen;
1916         if (dev->type == ARPHRD_ETHER)
1917                 dev->mtu -= ETH_HLEN;
1918         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1919                 dev->mtu -= 8;
1920
1921         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1922         ip6erspan_tnl_link_config(tunnel, 1);
1923
1924         netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1925         return 0;
1926
1927 cleanup_dst_cache_init:
1928         dst_cache_destroy(&tunnel->dst_cache);
1929 cleanup_alloc_pcpu_stats:
1930         free_percpu(dev->tstats);
1931         dev->tstats = NULL;
1932         return ret;
1933 }
1934
1935 static const struct net_device_ops ip6erspan_netdev_ops = {
1936         .ndo_init =             ip6erspan_tap_init,
1937         .ndo_uninit =           ip6erspan_tunnel_uninit,
1938         .ndo_start_xmit =       ip6erspan_tunnel_xmit,
1939         .ndo_set_mac_address =  eth_mac_addr,
1940         .ndo_validate_addr =    eth_validate_addr,
1941         .ndo_change_mtu =       ip6_tnl_change_mtu,
1942         .ndo_get_stats64 =      dev_get_tstats64,
1943         .ndo_get_iflink =       ip6_tnl_get_iflink,
1944 };
1945
1946 static void ip6gre_tap_setup(struct net_device *dev)
1947 {
1948
1949         ether_setup(dev);
1950
1951         dev->max_mtu = 0;
1952         dev->netdev_ops = &ip6gre_tap_netdev_ops;
1953         dev->needs_free_netdev = true;
1954         dev->priv_destructor = ip6gre_dev_free;
1955
1956         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1957         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1958         netif_keep_dst(dev);
1959 }
1960
1961 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1962                                        struct ip_tunnel_encap *ipencap)
1963 {
1964         bool ret = false;
1965
1966         memset(ipencap, 0, sizeof(*ipencap));
1967
1968         if (!data)
1969                 return ret;
1970
1971         if (data[IFLA_GRE_ENCAP_TYPE]) {
1972                 ret = true;
1973                 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1974         }
1975
1976         if (data[IFLA_GRE_ENCAP_FLAGS]) {
1977                 ret = true;
1978                 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1979         }
1980
1981         if (data[IFLA_GRE_ENCAP_SPORT]) {
1982                 ret = true;
1983                 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1984         }
1985
1986         if (data[IFLA_GRE_ENCAP_DPORT]) {
1987                 ret = true;
1988                 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1989         }
1990
1991         return ret;
1992 }
1993
1994 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1995                                  struct nlattr *tb[], struct nlattr *data[],
1996                                  struct netlink_ext_ack *extack)
1997 {
1998         struct ip6_tnl *nt;
1999         struct ip_tunnel_encap ipencap;
2000         int err;
2001
2002         nt = netdev_priv(dev);
2003
2004         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2005                 int err = ip6_tnl_encap_setup(nt, &ipencap);
2006
2007                 if (err < 0)
2008                         return err;
2009         }
2010
2011         if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
2012                 eth_hw_addr_random(dev);
2013
2014         nt->dev = dev;
2015         nt->net = dev_net(dev);
2016
2017         err = register_netdevice(dev);
2018         if (err)
2019                 goto out;
2020
2021         if (tb[IFLA_MTU])
2022                 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2023
2024 out:
2025         return err;
2026 }
2027
2028 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2029                           struct nlattr *tb[], struct nlattr *data[],
2030                           struct netlink_ext_ack *extack)
2031 {
2032         struct ip6_tnl *nt = netdev_priv(dev);
2033         struct net *net = dev_net(dev);
2034         struct ip6gre_net *ign;
2035         int err;
2036
2037         ip6gre_netlink_parms(data, &nt->parms);
2038         ign = net_generic(net, ip6gre_net_id);
2039
2040         if (nt->parms.collect_md) {
2041                 if (rtnl_dereference(ign->collect_md_tun))
2042                         return -EEXIST;
2043         } else {
2044                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2045                         return -EEXIST;
2046         }
2047
2048         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2049         if (!err) {
2050                 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2051                 ip6gre_tunnel_link_md(ign, nt);
2052                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2053         }
2054         return err;
2055 }
2056
2057 static struct ip6_tnl *
2058 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2059                          struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2060                          struct netlink_ext_ack *extack)
2061 {
2062         struct ip6_tnl *t, *nt = netdev_priv(dev);
2063         struct net *net = nt->net;
2064         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2065         struct ip_tunnel_encap ipencap;
2066
2067         if (dev == ign->fb_tunnel_dev)
2068                 return ERR_PTR(-EINVAL);
2069
2070         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2071                 int err = ip6_tnl_encap_setup(nt, &ipencap);
2072
2073                 if (err < 0)
2074                         return ERR_PTR(err);
2075         }
2076
2077         ip6gre_netlink_parms(data, p_p);
2078
2079         t = ip6gre_tunnel_locate(net, p_p, 0);
2080
2081         if (t) {
2082                 if (t->dev != dev)
2083                         return ERR_PTR(-EEXIST);
2084         } else {
2085                 t = nt;
2086         }
2087
2088         return t;
2089 }
2090
2091 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2092                              struct nlattr *data[],
2093                              struct netlink_ext_ack *extack)
2094 {
2095         struct ip6_tnl *t = netdev_priv(dev);
2096         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2097         struct __ip6_tnl_parm p;
2098
2099         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2100         if (IS_ERR(t))
2101                 return PTR_ERR(t);
2102
2103         ip6gre_tunnel_unlink_md(ign, t);
2104         ip6gre_tunnel_unlink(ign, t);
2105         ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2106         ip6gre_tunnel_link_md(ign, t);
2107         ip6gre_tunnel_link(ign, t);
2108         return 0;
2109 }
2110
2111 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2112 {
2113         struct net *net = dev_net(dev);
2114         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2115
2116         if (dev != ign->fb_tunnel_dev)
2117                 unregister_netdevice_queue(dev, head);
2118 }
2119
2120 static size_t ip6gre_get_size(const struct net_device *dev)
2121 {
2122         return
2123                 /* IFLA_GRE_LINK */
2124                 nla_total_size(4) +
2125                 /* IFLA_GRE_IFLAGS */
2126                 nla_total_size(2) +
2127                 /* IFLA_GRE_OFLAGS */
2128                 nla_total_size(2) +
2129                 /* IFLA_GRE_IKEY */
2130                 nla_total_size(4) +
2131                 /* IFLA_GRE_OKEY */
2132                 nla_total_size(4) +
2133                 /* IFLA_GRE_LOCAL */
2134                 nla_total_size(sizeof(struct in6_addr)) +
2135                 /* IFLA_GRE_REMOTE */
2136                 nla_total_size(sizeof(struct in6_addr)) +
2137                 /* IFLA_GRE_TTL */
2138                 nla_total_size(1) +
2139                 /* IFLA_GRE_ENCAP_LIMIT */
2140                 nla_total_size(1) +
2141                 /* IFLA_GRE_FLOWINFO */
2142                 nla_total_size(4) +
2143                 /* IFLA_GRE_FLAGS */
2144                 nla_total_size(4) +
2145                 /* IFLA_GRE_ENCAP_TYPE */
2146                 nla_total_size(2) +
2147                 /* IFLA_GRE_ENCAP_FLAGS */
2148                 nla_total_size(2) +
2149                 /* IFLA_GRE_ENCAP_SPORT */
2150                 nla_total_size(2) +
2151                 /* IFLA_GRE_ENCAP_DPORT */
2152                 nla_total_size(2) +
2153                 /* IFLA_GRE_COLLECT_METADATA */
2154                 nla_total_size(0) +
2155                 /* IFLA_GRE_FWMARK */
2156                 nla_total_size(4) +
2157                 /* IFLA_GRE_ERSPAN_INDEX */
2158                 nla_total_size(4) +
2159                 0;
2160 }
2161
2162 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2163 {
2164         struct ip6_tnl *t = netdev_priv(dev);
2165         struct __ip6_tnl_parm *p = &t->parms;
2166         __be16 o_flags = p->o_flags;
2167
2168         if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2169                 if (!p->collect_md)
2170                         o_flags |= TUNNEL_KEY;
2171
2172                 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2173                         goto nla_put_failure;
2174
2175                 if (p->erspan_ver == 1) {
2176                         if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2177                                 goto nla_put_failure;
2178                 } else {
2179                         if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2180                                 goto nla_put_failure;
2181                         if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2182                                 goto nla_put_failure;
2183                 }
2184         }
2185
2186         if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2187             nla_put_be16(skb, IFLA_GRE_IFLAGS,
2188                          gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2189             nla_put_be16(skb, IFLA_GRE_OFLAGS,
2190                          gre_tnl_flags_to_gre_flags(o_flags)) ||
2191             nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2192             nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2193             nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2194             nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2195             nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2196             nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2197             nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2198             nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2199             nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2200                 goto nla_put_failure;
2201
2202         if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2203                         t->encap.type) ||
2204             nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2205                          t->encap.sport) ||
2206             nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2207                          t->encap.dport) ||
2208             nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2209                         t->encap.flags))
2210                 goto nla_put_failure;
2211
2212         if (p->collect_md) {
2213                 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2214                         goto nla_put_failure;
2215         }
2216
2217         return 0;
2218
2219 nla_put_failure:
2220         return -EMSGSIZE;
2221 }
2222
2223 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2224         [IFLA_GRE_LINK]        = { .type = NLA_U32 },
2225         [IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2226         [IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2227         [IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2228         [IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2229         [IFLA_GRE_LOCAL]       = { .len = sizeof_field(struct ipv6hdr, saddr) },
2230         [IFLA_GRE_REMOTE]      = { .len = sizeof_field(struct ipv6hdr, daddr) },
2231         [IFLA_GRE_TTL]         = { .type = NLA_U8 },
2232         [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2233         [IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2234         [IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2235         [IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2236         [IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2237         [IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2238         [IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2239         [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2240         [IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2241         [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2242         [IFLA_GRE_ERSPAN_VER]   = { .type = NLA_U8 },
2243         [IFLA_GRE_ERSPAN_DIR]   = { .type = NLA_U8 },
2244         [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
2245 };
2246
2247 static void ip6erspan_tap_setup(struct net_device *dev)
2248 {
2249         ether_setup(dev);
2250
2251         dev->max_mtu = 0;
2252         dev->netdev_ops = &ip6erspan_netdev_ops;
2253         dev->needs_free_netdev = true;
2254         dev->priv_destructor = ip6gre_dev_free;
2255
2256         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2257         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2258         netif_keep_dst(dev);
2259 }
2260
2261 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2262                              struct nlattr *tb[], struct nlattr *data[],
2263                              struct netlink_ext_ack *extack)
2264 {
2265         struct ip6_tnl *nt = netdev_priv(dev);
2266         struct net *net = dev_net(dev);
2267         struct ip6gre_net *ign;
2268         int err;
2269
2270         ip6gre_netlink_parms(data, &nt->parms);
2271         ip6erspan_set_version(data, &nt->parms);
2272         ign = net_generic(net, ip6gre_net_id);
2273
2274         if (nt->parms.collect_md) {
2275                 if (rtnl_dereference(ign->collect_md_tun_erspan))
2276                         return -EEXIST;
2277         } else {
2278                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2279                         return -EEXIST;
2280         }
2281
2282         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2283         if (!err) {
2284                 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2285                 ip6erspan_tunnel_link_md(ign, nt);
2286                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2287         }
2288         return err;
2289 }
2290
2291 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2292 {
2293         ip6gre_tnl_link_config_common(t);
2294         ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2295 }
2296
2297 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2298                                 const struct __ip6_tnl_parm *p, int set_mtu)
2299 {
2300         ip6gre_tnl_copy_tnl_parm(t, p);
2301         ip6erspan_tnl_link_config(t, set_mtu);
2302         return 0;
2303 }
2304
2305 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2306                                 struct nlattr *data[],
2307                                 struct netlink_ext_ack *extack)
2308 {
2309         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2310         struct __ip6_tnl_parm p;
2311         struct ip6_tnl *t;
2312
2313         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2314         if (IS_ERR(t))
2315                 return PTR_ERR(t);
2316
2317         ip6erspan_set_version(data, &p);
2318         ip6gre_tunnel_unlink_md(ign, t);
2319         ip6gre_tunnel_unlink(ign, t);
2320         ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2321         ip6erspan_tunnel_link_md(ign, t);
2322         ip6gre_tunnel_link(ign, t);
2323         return 0;
2324 }
2325
2326 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2327         .kind           = "ip6gre",
2328         .maxtype        = IFLA_GRE_MAX,
2329         .policy         = ip6gre_policy,
2330         .priv_size      = sizeof(struct ip6_tnl),
2331         .setup          = ip6gre_tunnel_setup,
2332         .validate       = ip6gre_tunnel_validate,
2333         .newlink        = ip6gre_newlink,
2334         .changelink     = ip6gre_changelink,
2335         .dellink        = ip6gre_dellink,
2336         .get_size       = ip6gre_get_size,
2337         .fill_info      = ip6gre_fill_info,
2338         .get_link_net   = ip6_tnl_get_link_net,
2339 };
2340
2341 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2342         .kind           = "ip6gretap",
2343         .maxtype        = IFLA_GRE_MAX,
2344         .policy         = ip6gre_policy,
2345         .priv_size      = sizeof(struct ip6_tnl),
2346         .setup          = ip6gre_tap_setup,
2347         .validate       = ip6gre_tap_validate,
2348         .newlink        = ip6gre_newlink,
2349         .changelink     = ip6gre_changelink,
2350         .get_size       = ip6gre_get_size,
2351         .fill_info      = ip6gre_fill_info,
2352         .get_link_net   = ip6_tnl_get_link_net,
2353 };
2354
2355 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2356         .kind           = "ip6erspan",
2357         .maxtype        = IFLA_GRE_MAX,
2358         .policy         = ip6gre_policy,
2359         .priv_size      = sizeof(struct ip6_tnl),
2360         .setup          = ip6erspan_tap_setup,
2361         .validate       = ip6erspan_tap_validate,
2362         .newlink        = ip6erspan_newlink,
2363         .changelink     = ip6erspan_changelink,
2364         .get_size       = ip6gre_get_size,
2365         .fill_info      = ip6gre_fill_info,
2366         .get_link_net   = ip6_tnl_get_link_net,
2367 };
2368
2369 /*
2370  *      And now the modules code and kernel interface.
2371  */
2372
2373 static int __init ip6gre_init(void)
2374 {
2375         int err;
2376
2377         pr_info("GRE over IPv6 tunneling driver\n");
2378
2379         err = register_pernet_device(&ip6gre_net_ops);
2380         if (err < 0)
2381                 return err;
2382
2383         err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2384         if (err < 0) {
2385                 pr_info("%s: can't add protocol\n", __func__);
2386                 goto add_proto_failed;
2387         }
2388
2389         err = rtnl_link_register(&ip6gre_link_ops);
2390         if (err < 0)
2391                 goto rtnl_link_failed;
2392
2393         err = rtnl_link_register(&ip6gre_tap_ops);
2394         if (err < 0)
2395                 goto tap_ops_failed;
2396
2397         err = rtnl_link_register(&ip6erspan_tap_ops);
2398         if (err < 0)
2399                 goto erspan_link_failed;
2400
2401 out:
2402         return err;
2403
2404 erspan_link_failed:
2405         rtnl_link_unregister(&ip6gre_tap_ops);
2406 tap_ops_failed:
2407         rtnl_link_unregister(&ip6gre_link_ops);
2408 rtnl_link_failed:
2409         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2410 add_proto_failed:
2411         unregister_pernet_device(&ip6gre_net_ops);
2412         goto out;
2413 }
2414
2415 static void __exit ip6gre_fini(void)
2416 {
2417         rtnl_link_unregister(&ip6gre_tap_ops);
2418         rtnl_link_unregister(&ip6gre_link_ops);
2419         rtnl_link_unregister(&ip6erspan_tap_ops);
2420         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2421         unregister_pernet_device(&ip6gre_net_ops);
2422 }
2423
2424 module_init(ip6gre_init);
2425 module_exit(ip6gre_fini);
2426 MODULE_LICENSE("GPL");
2427 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2428 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2429 MODULE_ALIAS_RTNL_LINK("ip6gre");
2430 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2431 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2432 MODULE_ALIAS_NETDEV("ip6gre0");