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         if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
 532                 return PACKET_REJECT;
 533
 534         ipv6h = ipv6_hdr(skb);
 535         ershdr = (struct erspan_base_hdr *)skb->data;
 536         ver = ershdr->ver;
 537
 538         tunnel = ip6gre_tunnel_lookup(skb->dev,
 539                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 540                                       tpi->proto);
 541         if (tunnel) {
 542                 int len = erspan_hdr_len(ver);
 543
 544                 if (unlikely(!pskb_may_pull(skb, len)))
 545                         return PACKET_REJECT;
 546
 547                 if (__iptunnel_pull_header(skb, len,
 548                                            htons(ETH_P_TEB),
 549                                            false, false) < 0)
 550                         return PACKET_REJECT;
 551
 552                 if (tunnel->parms.collect_md) {
 553                         struct erspan_metadata *pkt_md, *md;
 554                         struct metadata_dst *tun_dst;
 555                         struct ip_tunnel_info *info;
 556                         unsigned char *gh;
 557                         __be64 tun_id;
 558                         __be16 flags;
 559
 560                         tpi->flags |= TUNNEL_KEY;
 561                         flags = tpi->flags;
 562                         tun_id = key32_to_tunnel_id(tpi->key);
 563
 564                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
 565                                                   sizeof(*md));
 566                         if (!tun_dst)
 567                                 return PACKET_REJECT;
 568
 569                         /* skb can be uncloned in __iptunnel_pull_header, so
 570                          * old pkt_md is no longer valid and we need to reset
 571                          * it
 572                          */
 573                         gh = skb_network_header(skb) +
 574                              skb_network_header_len(skb);
 575                         pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
 576                                                             sizeof(*ershdr));
 577                         info = &tun_dst->u.tun_info;
 578                         md = ip_tunnel_info_opts(info);
 579                         md->version = ver;
 580                         md2 = &md->u.md2;
 581                         memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
 582                                                        ERSPAN_V2_MDSIZE);
 583                         info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
 584                         info->options_len = sizeof(*md);
 585
 586                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 587
 588                 } else {
 589                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 590                 }
 591
 592                 return PACKET_RCVD;
 593         }
 594
 595         return PACKET_REJECT;
 596 }
 597
 598 static int gre_rcv(struct sk_buff *skb)
 599 {
 600         struct tnl_ptk_info tpi;
 601         bool csum_err = false;
 602         int hdr_len;
 603
 604         hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
 605         if (hdr_len < 0)
 606                 goto drop;
 607
 608         if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 609                 goto drop;
 610
 611         if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
 612                      tpi.proto == htons(ETH_P_ERSPAN2))) {
 613                 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
 614                         return 0;
 615                 goto out;
 616         }
 617
 618         if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 619                 return 0;
 620
 621 out:
 622         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 623 drop:
 624         kfree_skb(skb);
 625         return 0;
 626 }
 627
 628 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 629 {
 630         return iptunnel_handle_offloads(skb,
 631                                         csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 632 }
 633
 634 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
 635                                      struct net_device *dev,
 636                                      struct flowi6 *fl6, __u8 *dsfield,
 637                                      int *encap_limit)
 638 {
 639         const struct iphdr *iph = ip_hdr(skb);
 640         struct ip6_tnl *t = netdev_priv(dev);
 641
 642         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 643                 *encap_limit = t->parms.encap_limit;
 644
 645         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 646
 647         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 648                 *dsfield = ipv4_get_dsfield(iph);
 649         else
 650                 *dsfield = ip6_tclass(t->parms.flowinfo);
 651
 652         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 653                 fl6->flowi6_mark = skb->mark;
 654         else
 655                 fl6->flowi6_mark = t->parms.fwmark;
 656
 657         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 658 }
 659
 660 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
 661                                     struct net_device *dev,
 662                                     struct flowi6 *fl6, __u8 *dsfield,
 663                                     int *encap_limit)
 664 {
 665         struct ipv6hdr *ipv6h;
 666         struct ip6_tnl *t = netdev_priv(dev);
 667         __u16 offset;
 668
 669         offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
 670         /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
 671         ipv6h = ipv6_hdr(skb);
 672
 673         if (offset > 0) {
 674                 struct ipv6_tlv_tnl_enc_lim *tel;
 675
 676                 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
 677                 if (tel->encap_limit == 0) {
 678                         icmpv6_ndo_send(skb, ICMPV6_PARAMPROB,
 679                                         ICMPV6_HDR_FIELD, offset + 2);
 680                         return -1;
 681                 }
 682                 *encap_limit = tel->encap_limit - 1;
 683         } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
 684                 *encap_limit = t->parms.encap_limit;
 685         }
 686
 687         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 688
 689         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 690                 *dsfield = ipv6_get_dsfield(ipv6h);
 691         else
 692                 *dsfield = ip6_tclass(t->parms.flowinfo);
 693
 694         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 695                 fl6->flowlabel |= ip6_flowlabel(ipv6h);
 696
 697         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 698                 fl6->flowi6_mark = skb->mark;
 699         else
 700                 fl6->flowi6_mark = t->parms.fwmark;
 701
 702         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 703
 704         return 0;
 705 }
 706
 707 static int prepare_ip6gre_xmit_other(struct sk_buff *skb,
 708                                      struct net_device *dev,
 709                                      struct flowi6 *fl6, __u8 *dsfield,
 710                                      int *encap_limit)
 711 {
 712         struct ip6_tnl *t = netdev_priv(dev);
 713
 714         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 715                 *encap_limit = t->parms.encap_limit;
 716
 717         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 718
 719         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 720                 *dsfield = 0;
 721         else
 722                 *dsfield = ip6_tclass(t->parms.flowinfo);
 723
 724         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 725                 fl6->flowi6_mark = skb->mark;
 726         else
 727                 fl6->flowi6_mark = t->parms.fwmark;
 728
 729         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 730
 731         return 0;
 732 }
 733
 734 static struct ip_tunnel_info *skb_tunnel_info_txcheck(struct sk_buff *skb)
 735 {
 736         struct ip_tunnel_info *tun_info;
 737
 738         tun_info = skb_tunnel_info(skb);
 739         if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
 740                 return ERR_PTR(-EINVAL);
 741
 742         return tun_info;
 743 }
 744
 745 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
 746                                struct net_device *dev, __u8 dsfield,
 747                                struct flowi6 *fl6, int encap_limit,
 748                                __u32 *pmtu, __be16 proto)
 749 {
 750         struct ip6_tnl *tunnel = netdev_priv(dev);
 751         __be16 protocol;
 752         __be16 flags;
 753
 754         if (dev->type == ARPHRD_ETHER)
 755                 IPCB(skb)->flags = 0;
 756
 757         if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
 758                 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
 759         else
 760                 fl6->daddr = tunnel->parms.raddr;
 761
 762         /* Push GRE header. */
 763         protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
 764
 765         if (tunnel->parms.collect_md) {
 766                 struct ip_tunnel_info *tun_info;
 767                 const struct ip_tunnel_key *key;
 768                 int tun_hlen;
 769
 770                 tun_info = skb_tunnel_info_txcheck(skb);
 771                 if (IS_ERR(tun_info) ||
 772                     unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
 773                         return -EINVAL;
 774
 775                 key = &tun_info->key;
 776                 memset(fl6, 0, sizeof(*fl6));
 777                 fl6->flowi6_proto = IPPROTO_GRE;
 778                 fl6->daddr = key->u.ipv6.dst;
 779                 fl6->flowlabel = key->label;
 780                 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 781                 fl6->fl6_gre_key = tunnel_id_to_key32(key->tun_id);
 782
 783                 dsfield = key->tos;
 784                 flags = key->tun_flags &
 785                         (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
 786                 tun_hlen = gre_calc_hlen(flags);
 787
 788                 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
 789                         return -ENOMEM;
 790
 791                 gre_build_header(skb, tun_hlen,
 792                                  flags, protocol,
 793                                  tunnel_id_to_key32(tun_info->key.tun_id),
 794                                  (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
 795                                                       : 0);
 796
 797         } else {
 798                 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
 799                         return -ENOMEM;
 800
 801                 flags = tunnel->parms.o_flags;
 802
 803                 gre_build_header(skb, tunnel->tun_hlen, flags,
 804                                  protocol, tunnel->parms.o_key,
 805                                  (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
 806                                                       : 0);
 807         }
 808
 809         return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
 810                             NEXTHDR_GRE);
 811 }
 812
 813 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
 814 {
 815         struct ip6_tnl *t = netdev_priv(dev);
 816         int encap_limit = -1;
 817         struct flowi6 fl6;
 818         __u8 dsfield = 0;
 819         __u32 mtu;
 820         int err;
 821
 822         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 823
 824         if (!t->parms.collect_md)
 825                 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
 826                                          &dsfield, &encap_limit);
 827
 828         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 829         if (err)
 830                 return -1;
 831
 832         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
 833                           skb->protocol);
 834         if (err != 0) {
 835                 /* XXX: send ICMP error even if DF is not set. */
 836                 if (err == -EMSGSIZE)
 837                         icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 838                                       htonl(mtu));
 839                 return -1;
 840         }
 841
 842         return 0;
 843 }
 844
 845 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
 846 {
 847         struct ip6_tnl *t = netdev_priv(dev);
 848         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 849         int encap_limit = -1;
 850         struct flowi6 fl6;
 851         __u8 dsfield = 0;
 852         __u32 mtu;
 853         int err;
 854
 855         if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
 856                 return -1;
 857
 858         if (!t->parms.collect_md &&
 859             prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
 860                 return -1;
 861
 862         if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
 863                 return -1;
 864
 865         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
 866                           &mtu, skb->protocol);
 867         if (err != 0) {
 868                 if (err == -EMSGSIZE)
 869                         icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 870                 return -1;
 871         }
 872
 873         return 0;
 874 }
 875
 876 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
 877 {
 878         struct ip6_tnl *t = netdev_priv(dev);
 879         int encap_limit = -1;
 880         struct flowi6 fl6;
 881         __u8 dsfield = 0;
 882         __u32 mtu;
 883         int err;
 884
 885         if (!t->parms.collect_md &&
 886             prepare_ip6gre_xmit_other(skb, dev, &fl6, &dsfield, &encap_limit))
 887                 return -1;
 888
 889         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 890         if (err)
 891                 return err;
 892         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, skb->protocol);
 893
 894         return err;
 895 }
 896
 897 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
 898         struct net_device *dev)
 899 {
 900         struct ip6_tnl *t = netdev_priv(dev);
 901         __be16 payload_protocol;
 902         int ret;
 903
 904         if (!pskb_inet_may_pull(skb))
 905                 goto tx_err;
 906
 907         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 908                 goto tx_err;
 909
 910         payload_protocol = skb_protocol(skb, true);
 911         switch (payload_protocol) {
 912         case htons(ETH_P_IP):
 913                 ret = ip6gre_xmit_ipv4(skb, dev);
 914                 break;
 915         case htons(ETH_P_IPV6):
 916                 ret = ip6gre_xmit_ipv6(skb, dev);
 917                 break;
 918         default:
 919                 ret = ip6gre_xmit_other(skb, dev);
 920                 break;
 921         }
 922
 923         if (ret < 0)
 924                 goto tx_err;
 925
 926         return NETDEV_TX_OK;
 927
 928 tx_err:
 929         if (!t->parms.collect_md || !IS_ERR(skb_tunnel_info_txcheck(skb)))
 930                 DEV_STATS_INC(dev, tx_errors);
 931         DEV_STATS_INC(dev, tx_dropped);
 932         kfree_skb(skb);
 933         return NETDEV_TX_OK;
 934 }
 935
 936 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 937                                          struct net_device *dev)
 938 {
 939         struct ip_tunnel_info *tun_info = NULL;
 940         struct ip6_tnl *t = netdev_priv(dev);
 941         struct dst_entry *dst = skb_dst(skb);
 942         bool truncate = false;
 943         int encap_limit = -1;
 944         __u8 dsfield = false;
 945         struct flowi6 fl6;
 946         int err = -EINVAL;
 947         __be16 proto;
 948         __u32 mtu;
 949         int nhoff;
 950
 951         if (!pskb_inet_may_pull(skb))
 952                 goto tx_err;
 953
 954         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 955                 goto tx_err;
 956
 957         if (gre_handle_offloads(skb, false))
 958                 goto tx_err;
 959
 960         if (skb->len > dev->mtu + dev->hard_header_len) {
 961                 if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
 962                         goto tx_err;
 963                 truncate = true;
 964         }
 965
 966         nhoff = skb_network_offset(skb);
 967         if (skb->protocol == htons(ETH_P_IP) &&
 968             (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
 969                 truncate = true;
 970
 971         if (skb->protocol == htons(ETH_P_IPV6)) {
 972                 int thoff;
 973
 974                 if (skb_transport_header_was_set(skb))
 975                         thoff = skb_transport_offset(skb);
 976                 else
 977                         thoff = nhoff + sizeof(struct ipv6hdr);
 978                 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
 979                         truncate = true;
 980         }
 981
 982         if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
 983                 goto tx_err;
 984
 985         t->parms.o_flags &= ~TUNNEL_KEY;
 986         IPCB(skb)->flags = 0;
 987
 988         /* For collect_md mode, derive fl6 from the tunnel key,
 989          * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
 990          */
 991         if (t->parms.collect_md) {
 992                 const struct ip_tunnel_key *key;
 993                 struct erspan_metadata *md;
 994                 __be32 tun_id;
 995
 996                 tun_info = skb_tunnel_info_txcheck(skb);
 997                 if (IS_ERR(tun_info) ||
 998                     unlikely(ip_tunnel_info_af(tun_info) != AF_INET6))
 999                         goto tx_err;
1000
1001                 key = &tun_info->key;
1002                 memset(&fl6, 0, sizeof(fl6));
1003                 fl6.flowi6_proto = IPPROTO_GRE;
1004                 fl6.daddr = key->u.ipv6.dst;
1005                 fl6.flowlabel = key->label;
1006                 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1007                 fl6.fl6_gre_key = tunnel_id_to_key32(key->tun_id);
1008
1009                 dsfield = key->tos;
1010                 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1011                         goto tx_err;
1012                 if (tun_info->options_len < sizeof(*md))
1013                         goto tx_err;
1014                 md = ip_tunnel_info_opts(tun_info);
1015
1016                 tun_id = tunnel_id_to_key32(key->tun_id);
1017                 if (md->version == 1) {
1018                         erspan_build_header(skb,
1019                                             ntohl(tun_id),
1020                                             ntohl(md->u.index), truncate,
1021                                             false);
1022                         proto = htons(ETH_P_ERSPAN);
1023                 } else if (md->version == 2) {
1024                         erspan_build_header_v2(skb,
1025                                                ntohl(tun_id),
1026                                                md->u.md2.dir,
1027                                                get_hwid(&md->u.md2),
1028                                                truncate, false);
1029                         proto = htons(ETH_P_ERSPAN2);
1030                 } else {
1031                         goto tx_err;
1032                 }
1033         } else {
1034                 switch (skb->protocol) {
1035                 case htons(ETH_P_IP):
1036                         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1037                         prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1038                                                  &dsfield, &encap_limit);
1039                         break;
1040                 case htons(ETH_P_IPV6):
1041                         if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1042                                 goto tx_err;
1043                         if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1044                                                      &dsfield, &encap_limit))
1045                                 goto tx_err;
1046                         break;
1047                 default:
1048                         memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1049                         break;
1050                 }
1051
1052                 if (t->parms.erspan_ver == 1) {
1053                         erspan_build_header(skb, ntohl(t->parms.o_key),
1054                                             t->parms.index,
1055                                             truncate, false);
1056                         proto = htons(ETH_P_ERSPAN);
1057                 } else if (t->parms.erspan_ver == 2) {
1058                         erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1059                                                t->parms.dir,
1060                                                t->parms.hwid,
1061                                                truncate, false);
1062                         proto = htons(ETH_P_ERSPAN2);
1063                 } else {
1064                         goto tx_err;
1065                 }
1066
1067                 fl6.daddr = t->parms.raddr;
1068         }
1069
1070         /* Push GRE header. */
1071         gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1072
1073         /* TooBig packet may have updated dst->dev's mtu */
1074         if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1075                 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1076
1077         err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1078                            NEXTHDR_GRE);
1079         if (err != 0) {
1080                 /* XXX: send ICMP error even if DF is not set. */
1081                 if (err == -EMSGSIZE) {
1082                         if (skb->protocol == htons(ETH_P_IP))
1083                                 icmp_ndo_send(skb, ICMP_DEST_UNREACH,
1084                                               ICMP_FRAG_NEEDED, htonl(mtu));
1085                         else
1086                                 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1087                 }
1088
1089                 goto tx_err;
1090         }
1091         return NETDEV_TX_OK;
1092
1093 tx_err:
1094         if (!IS_ERR(tun_info))
1095                 DEV_STATS_INC(dev, tx_errors);
1096         DEV_STATS_INC(dev, tx_dropped);
1097         kfree_skb(skb);
1098         return NETDEV_TX_OK;
1099 }
1100
1101 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1102 {
1103         struct net_device *dev = t->dev;
1104         struct __ip6_tnl_parm *p = &t->parms;
1105         struct flowi6 *fl6 = &t->fl.u.ip6;
1106
1107         if (dev->type != ARPHRD_ETHER) {
1108                 __dev_addr_set(dev, &p->laddr, sizeof(struct in6_addr));
1109                 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1110         }
1111
1112         /* Set up flowi template */
1113         fl6->saddr = p->laddr;
1114         fl6->daddr = p->raddr;
1115         fl6->flowi6_oif = p->link;
1116         fl6->flowlabel = 0;
1117         fl6->flowi6_proto = IPPROTO_GRE;
1118         fl6->fl6_gre_key = t->parms.o_key;
1119
1120         if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1121                 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1122         if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1123                 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1124
1125         p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1126         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1127
1128         if (p->flags&IP6_TNL_F_CAP_XMIT &&
1129                         p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1130                 dev->flags |= IFF_POINTOPOINT;
1131         else
1132                 dev->flags &= ~IFF_POINTOPOINT;
1133 }
1134
1135 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1136                                          int t_hlen)
1137 {
1138         const struct __ip6_tnl_parm *p = &t->parms;
1139         struct net_device *dev = t->dev;
1140
1141         if (p->flags & IP6_TNL_F_CAP_XMIT) {
1142                 int strict = (ipv6_addr_type(&p->raddr) &
1143                               (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1144
1145                 struct rt6_info *rt = rt6_lookup(t->net,
1146                                                  &p->raddr, &p->laddr,
1147                                                  p->link, NULL, strict);
1148
1149                 if (!rt)
1150                         return;
1151
1152                 if (rt->dst.dev) {
1153                         unsigned short dst_len = rt->dst.dev->hard_header_len +
1154                                                  t_hlen;
1155
1156                         if (t->dev->header_ops)
1157                                 dev->hard_header_len = dst_len;
1158                         else
1159                                 dev->needed_headroom = dst_len;
1160
1161                         if (set_mtu) {
1162                                 int mtu = rt->dst.dev->mtu - t_hlen;
1163
1164                                 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1165                                         mtu -= 8;
1166                                 if (dev->type == ARPHRD_ETHER)
1167                                         mtu -= ETH_HLEN;
1168
1169                                 if (mtu < IPV6_MIN_MTU)
1170                                         mtu = IPV6_MIN_MTU;
1171                                 WRITE_ONCE(dev->mtu, mtu);
1172                         }
1173                 }
1174                 ip6_rt_put(rt);
1175         }
1176 }
1177
1178 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1179 {
1180         int t_hlen;
1181
1182         tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1183         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1184
1185         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1186
1187         if (tunnel->dev->header_ops)
1188                 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1189         else
1190                 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1191
1192         return t_hlen;
1193 }
1194
1195 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1196 {
1197         ip6gre_tnl_link_config_common(t);
1198         ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1199 }
1200
1201 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1202                                      const struct __ip6_tnl_parm *p)
1203 {
1204         t->parms.laddr = p->laddr;
1205         t->parms.raddr = p->raddr;
1206         t->parms.flags = p->flags;
1207         t->parms.hop_limit = p->hop_limit;
1208         t->parms.encap_limit = p->encap_limit;
1209         t->parms.flowinfo = p->flowinfo;
1210         t->parms.link = p->link;
1211         t->parms.proto = p->proto;
1212         t->parms.i_key = p->i_key;
1213         t->parms.o_key = p->o_key;
1214         t->parms.i_flags = p->i_flags;
1215         t->parms.o_flags = p->o_flags;
1216         t->parms.fwmark = p->fwmark;
1217         t->parms.erspan_ver = p->erspan_ver;
1218         t->parms.index = p->index;
1219         t->parms.dir = p->dir;
1220         t->parms.hwid = p->hwid;
1221         dst_cache_reset(&t->dst_cache);
1222 }
1223
1224 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1225                              int set_mtu)
1226 {
1227         ip6gre_tnl_copy_tnl_parm(t, p);
1228         ip6gre_tnl_link_config(t, set_mtu);
1229         return 0;
1230 }
1231
1232 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1233         const struct ip6_tnl_parm2 *u)
1234 {
1235         p->laddr = u->laddr;
1236         p->raddr = u->raddr;
1237         p->flags = u->flags;
1238         p->hop_limit = u->hop_limit;
1239         p->encap_limit = u->encap_limit;
1240         p->flowinfo = u->flowinfo;
1241         p->link = u->link;
1242         p->i_key = u->i_key;
1243         p->o_key = u->o_key;
1244         p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1245         p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1246         memcpy(p->name, u->name, sizeof(u->name));
1247 }
1248
1249 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1250         const struct __ip6_tnl_parm *p)
1251 {
1252         u->proto = IPPROTO_GRE;
1253         u->laddr = p->laddr;
1254         u->raddr = p->raddr;
1255         u->flags = p->flags;
1256         u->hop_limit = p->hop_limit;
1257         u->encap_limit = p->encap_limit;
1258         u->flowinfo = p->flowinfo;
1259         u->link = p->link;
1260         u->i_key = p->i_key;
1261         u->o_key = p->o_key;
1262         u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1263         u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1264         memcpy(u->name, p->name, sizeof(u->name));
1265 }
1266
1267 static int ip6gre_tunnel_siocdevprivate(struct net_device *dev,
1268                                         struct ifreq *ifr, void __user *data,
1269                                         int cmd)
1270 {
1271         int err = 0;
1272         struct ip6_tnl_parm2 p;
1273         struct __ip6_tnl_parm p1;
1274         struct ip6_tnl *t = netdev_priv(dev);
1275         struct net *net = t->net;
1276         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1277
1278         memset(&p1, 0, sizeof(p1));
1279
1280         switch (cmd) {
1281         case SIOCGETTUNNEL:
1282                 if (dev == ign->fb_tunnel_dev) {
1283                         if (copy_from_user(&p, data, sizeof(p))) {
1284                                 err = -EFAULT;
1285                                 break;
1286                         }
1287                         ip6gre_tnl_parm_from_user(&p1, &p);
1288                         t = ip6gre_tunnel_locate(net, &p1, 0);
1289                         if (!t)
1290                                 t = netdev_priv(dev);
1291                 }
1292                 memset(&p, 0, sizeof(p));
1293                 ip6gre_tnl_parm_to_user(&p, &t->parms);
1294                 if (copy_to_user(data, &p, sizeof(p)))
1295                         err = -EFAULT;
1296                 break;
1297
1298         case SIOCADDTUNNEL:
1299         case SIOCCHGTUNNEL:
1300                 err = -EPERM;
1301                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1302                         goto done;
1303
1304                 err = -EFAULT;
1305                 if (copy_from_user(&p, data, sizeof(p)))
1306                         goto done;
1307
1308                 err = -EINVAL;
1309                 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1310                         goto done;
1311
1312                 if (!(p.i_flags&GRE_KEY))
1313                         p.i_key = 0;
1314                 if (!(p.o_flags&GRE_KEY))
1315                         p.o_key = 0;
1316
1317                 ip6gre_tnl_parm_from_user(&p1, &p);
1318                 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1319
1320                 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1321                         if (t) {
1322                                 if (t->dev != dev) {
1323                                         err = -EEXIST;
1324                                         break;
1325                                 }
1326                         } else {
1327                                 t = netdev_priv(dev);
1328
1329                                 ip6gre_tunnel_unlink(ign, t);
1330                                 synchronize_net();
1331                                 ip6gre_tnl_change(t, &p1, 1);
1332                                 ip6gre_tunnel_link(ign, t);
1333                                 netdev_state_change(dev);
1334                         }
1335                 }
1336
1337                 if (t) {
1338                         err = 0;
1339
1340                         memset(&p, 0, sizeof(p));
1341                         ip6gre_tnl_parm_to_user(&p, &t->parms);
1342                         if (copy_to_user(data, &p, sizeof(p)))
1343                                 err = -EFAULT;
1344                 } else
1345                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1346                 break;
1347
1348         case SIOCDELTUNNEL:
1349                 err = -EPERM;
1350                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1351                         goto done;
1352
1353                 if (dev == ign->fb_tunnel_dev) {
1354                         err = -EFAULT;
1355                         if (copy_from_user(&p, data, sizeof(p)))
1356                                 goto done;
1357                         err = -ENOENT;
1358                         ip6gre_tnl_parm_from_user(&p1, &p);
1359                         t = ip6gre_tunnel_locate(net, &p1, 0);
1360                         if (!t)
1361                                 goto done;
1362                         err = -EPERM;
1363                         if (t == netdev_priv(ign->fb_tunnel_dev))
1364                                 goto done;
1365                         dev = t->dev;
1366                 }
1367                 unregister_netdevice(dev);
1368                 err = 0;
1369                 break;
1370
1371         default:
1372                 err = -EINVAL;
1373         }
1374
1375 done:
1376         return err;
1377 }
1378
1379 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1380                          unsigned short type, const void *daddr,
1381                          const void *saddr, unsigned int len)
1382 {
1383         struct ip6_tnl *t = netdev_priv(dev);
1384         struct ipv6hdr *ipv6h;
1385         __be16 *p;
1386
1387         ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1388         ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1389                                                   t->fl.u.ip6.flowlabel,
1390                                                   true, &t->fl.u.ip6));
1391         ipv6h->hop_limit = t->parms.hop_limit;
1392         ipv6h->nexthdr = NEXTHDR_GRE;
1393         ipv6h->saddr = t->parms.laddr;
1394         ipv6h->daddr = t->parms.raddr;
1395
1396         p = (__be16 *)(ipv6h + 1);
1397         p[0] = t->parms.o_flags;
1398         p[1] = htons(type);
1399
1400         /*
1401          *      Set the source hardware address.
1402          */
1403
1404         if (saddr)
1405                 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1406         if (daddr)
1407                 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1408         if (!ipv6_addr_any(&ipv6h->daddr))
1409                 return t->hlen;
1410
1411         return -t->hlen;
1412 }
1413
1414 static const struct header_ops ip6gre_header_ops = {
1415         .create = ip6gre_header,
1416 };
1417
1418 static const struct net_device_ops ip6gre_netdev_ops = {
1419         .ndo_init               = ip6gre_tunnel_init,
1420         .ndo_uninit             = ip6gre_tunnel_uninit,
1421         .ndo_start_xmit         = ip6gre_tunnel_xmit,
1422         .ndo_siocdevprivate     = ip6gre_tunnel_siocdevprivate,
1423         .ndo_change_mtu         = ip6_tnl_change_mtu,
1424         .ndo_get_stats64        = dev_get_tstats64,
1425         .ndo_get_iflink         = ip6_tnl_get_iflink,
1426 };
1427
1428 static void ip6gre_dev_free(struct net_device *dev)
1429 {
1430         struct ip6_tnl *t = netdev_priv(dev);
1431
1432         gro_cells_destroy(&t->gro_cells);
1433         dst_cache_destroy(&t->dst_cache);
1434         free_percpu(dev->tstats);
1435 }
1436
1437 static void ip6gre_tunnel_setup(struct net_device *dev)
1438 {
1439         dev->netdev_ops = &ip6gre_netdev_ops;
1440         dev->needs_free_netdev = true;
1441         dev->priv_destructor = ip6gre_dev_free;
1442
1443         dev->type = ARPHRD_IP6GRE;
1444
1445         dev->flags |= IFF_NOARP;
1446         dev->addr_len = sizeof(struct in6_addr);
1447         netif_keep_dst(dev);
1448         /* This perm addr will be used as interface identifier by IPv6 */
1449         dev->addr_assign_type = NET_ADDR_RANDOM;
1450         eth_random_addr(dev->perm_addr);
1451 }
1452
1453 #define GRE6_FEATURES (NETIF_F_SG |             \
1454                        NETIF_F_FRAGLIST |       \
1455                        NETIF_F_HIGHDMA |        \
1456                        NETIF_F_HW_CSUM)
1457
1458 static void ip6gre_tnl_init_features(struct net_device *dev)
1459 {
1460         struct ip6_tnl *nt = netdev_priv(dev);
1461         __be16 flags;
1462
1463         dev->features           |= GRE6_FEATURES | NETIF_F_LLTX;
1464         dev->hw_features        |= GRE6_FEATURES;
1465
1466         flags = nt->parms.o_flags;
1467
1468         /* TCP offload with GRE SEQ is not supported, nor can we support 2
1469          * levels of outer headers requiring an update.
1470          */
1471         if (flags & TUNNEL_SEQ)
1472                 return;
1473         if (flags & TUNNEL_CSUM && nt->encap.type != TUNNEL_ENCAP_NONE)
1474                 return;
1475
1476         dev->features |= NETIF_F_GSO_SOFTWARE;
1477         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1478 }
1479
1480 static int ip6gre_tunnel_init_common(struct net_device *dev)
1481 {
1482         struct ip6_tnl *tunnel;
1483         int ret;
1484         int t_hlen;
1485
1486         tunnel = netdev_priv(dev);
1487
1488         tunnel->dev = dev;
1489         tunnel->net = dev_net(dev);
1490         strcpy(tunnel->parms.name, dev->name);
1491
1492         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1493         if (!dev->tstats)
1494                 return -ENOMEM;
1495
1496         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1497         if (ret)
1498                 goto cleanup_alloc_pcpu_stats;
1499
1500         ret = gro_cells_init(&tunnel->gro_cells, dev);
1501         if (ret)
1502                 goto cleanup_dst_cache_init;
1503
1504         t_hlen = ip6gre_calc_hlen(tunnel);
1505         dev->mtu = ETH_DATA_LEN - t_hlen;
1506         if (dev->type == ARPHRD_ETHER)
1507                 dev->mtu -= ETH_HLEN;
1508         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1509                 dev->mtu -= 8;
1510
1511         if (tunnel->parms.collect_md) {
1512                 netif_keep_dst(dev);
1513         }
1514         ip6gre_tnl_init_features(dev);
1515
1516         netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1517         netdev_lockdep_set_classes(dev);
1518         return 0;
1519
1520 cleanup_dst_cache_init:
1521         dst_cache_destroy(&tunnel->dst_cache);
1522 cleanup_alloc_pcpu_stats:
1523         free_percpu(dev->tstats);
1524         dev->tstats = NULL;
1525         return ret;
1526 }
1527
1528 static int ip6gre_tunnel_init(struct net_device *dev)
1529 {
1530         struct ip6_tnl *tunnel;
1531         int ret;
1532
1533         ret = ip6gre_tunnel_init_common(dev);
1534         if (ret)
1535                 return ret;
1536
1537         tunnel = netdev_priv(dev);
1538
1539         if (tunnel->parms.collect_md)
1540                 return 0;
1541
1542         __dev_addr_set(dev, &tunnel->parms.laddr, sizeof(struct in6_addr));
1543         memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1544
1545         if (ipv6_addr_any(&tunnel->parms.raddr))
1546                 dev->header_ops = &ip6gre_header_ops;
1547
1548         return 0;
1549 }
1550
1551 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1552 {
1553         struct ip6_tnl *tunnel = netdev_priv(dev);
1554
1555         tunnel->dev = dev;
1556         tunnel->net = dev_net(dev);
1557         strcpy(tunnel->parms.name, dev->name);
1558
1559         tunnel->hlen            = sizeof(struct ipv6hdr) + 4;
1560 }
1561
1562 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1563         .handler     = gre_rcv,
1564         .err_handler = ip6gre_err,
1565         .flags       = INET6_PROTO_FINAL,
1566 };
1567
1568 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1569 {
1570         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1571         struct net_device *dev, *aux;
1572         int prio;
1573
1574         for_each_netdev_safe(net, dev, aux)
1575                 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1576                     dev->rtnl_link_ops == &ip6gre_tap_ops ||
1577                     dev->rtnl_link_ops == &ip6erspan_tap_ops)
1578                         unregister_netdevice_queue(dev, head);
1579
1580         for (prio = 0; prio < 4; prio++) {
1581                 int h;
1582                 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1583                         struct ip6_tnl *t;
1584
1585                         t = rtnl_dereference(ign->tunnels[prio][h]);
1586
1587                         while (t) {
1588                                 /* If dev is in the same netns, it has already
1589                                  * been added to the list by the previous loop.
1590                                  */
1591                                 if (!net_eq(dev_net(t->dev), net))
1592                                         unregister_netdevice_queue(t->dev,
1593                                                                    head);
1594                                 t = rtnl_dereference(t->next);
1595                         }
1596                 }
1597         }
1598 }
1599
1600 static int __net_init ip6gre_init_net(struct net *net)
1601 {
1602         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1603         struct net_device *ndev;
1604         int err;
1605
1606         if (!net_has_fallback_tunnels(net))
1607                 return 0;
1608         ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1609                             NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1610         if (!ndev) {
1611                 err = -ENOMEM;
1612                 goto err_alloc_dev;
1613         }
1614         ign->fb_tunnel_dev = ndev;
1615         dev_net_set(ign->fb_tunnel_dev, net);
1616         /* FB netdevice is special: we have one, and only one per netns.
1617          * Allowing to move it to another netns is clearly unsafe.
1618          */
1619         ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1620
1621
1622         ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1623         ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1624
1625         err = register_netdev(ign->fb_tunnel_dev);
1626         if (err)
1627                 goto err_reg_dev;
1628
1629         rcu_assign_pointer(ign->tunnels_wc[0],
1630                            netdev_priv(ign->fb_tunnel_dev));
1631         return 0;
1632
1633 err_reg_dev:
1634         free_netdev(ndev);
1635 err_alloc_dev:
1636         return err;
1637 }
1638
1639 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1640 {
1641         struct net *net;
1642         LIST_HEAD(list);
1643
1644         rtnl_lock();
1645         list_for_each_entry(net, net_list, exit_list)
1646                 ip6gre_destroy_tunnels(net, &list);
1647         unregister_netdevice_many(&list);
1648         rtnl_unlock();
1649 }
1650
1651 static struct pernet_operations ip6gre_net_ops = {
1652         .init = ip6gre_init_net,
1653         .exit_batch = ip6gre_exit_batch_net,
1654         .id   = &ip6gre_net_id,
1655         .size = sizeof(struct ip6gre_net),
1656 };
1657
1658 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1659                                   struct netlink_ext_ack *extack)
1660 {
1661         __be16 flags;
1662
1663         if (!data)
1664                 return 0;
1665
1666         flags = 0;
1667         if (data[IFLA_GRE_IFLAGS])
1668                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1669         if (data[IFLA_GRE_OFLAGS])
1670                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1671         if (flags & (GRE_VERSION|GRE_ROUTING))
1672                 return -EINVAL;
1673
1674         return 0;
1675 }
1676
1677 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1678                                struct netlink_ext_ack *extack)
1679 {
1680         struct in6_addr daddr;
1681
1682         if (tb[IFLA_ADDRESS]) {
1683                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1684                         return -EINVAL;
1685                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1686                         return -EADDRNOTAVAIL;
1687         }
1688
1689         if (!data)
1690                 goto out;
1691
1692         if (data[IFLA_GRE_REMOTE]) {
1693                 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1694                 if (ipv6_addr_any(&daddr))
1695                         return -EINVAL;
1696         }
1697
1698 out:
1699         return ip6gre_tunnel_validate(tb, data, extack);
1700 }
1701
1702 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1703                                   struct netlink_ext_ack *extack)
1704 {
1705         __be16 flags = 0;
1706         int ret, ver = 0;
1707
1708         if (!data)
1709                 return 0;
1710
1711         ret = ip6gre_tap_validate(tb, data, extack);
1712         if (ret)
1713                 return ret;
1714
1715         /* ERSPAN should only have GRE sequence and key flag */
1716         if (data[IFLA_GRE_OFLAGS])
1717                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1718         if (data[IFLA_GRE_IFLAGS])
1719                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1720         if (!data[IFLA_GRE_COLLECT_METADATA] &&
1721             flags != (GRE_SEQ | GRE_KEY))
1722                 return -EINVAL;
1723
1724         /* ERSPAN Session ID only has 10-bit. Since we reuse
1725          * 32-bit key field as ID, check it's range.
1726          */
1727         if (data[IFLA_GRE_IKEY] &&
1728             (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1729                 return -EINVAL;
1730
1731         if (data[IFLA_GRE_OKEY] &&
1732             (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1733                 return -EINVAL;
1734
1735         if (data[IFLA_GRE_ERSPAN_VER]) {
1736                 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1737                 if (ver != 1 && ver != 2)
1738                         return -EINVAL;
1739         }
1740
1741         if (ver == 1) {
1742                 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1743                         u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1744
1745                         if (index & ~INDEX_MASK)
1746                                 return -EINVAL;
1747                 }
1748         } else if (ver == 2) {
1749                 if (data[IFLA_GRE_ERSPAN_DIR]) {
1750                         u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1751
1752                         if (dir & ~(DIR_MASK >> DIR_OFFSET))
1753                                 return -EINVAL;
1754                 }
1755
1756                 if (data[IFLA_GRE_ERSPAN_HWID]) {
1757                         u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1758
1759                         if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1760                                 return -EINVAL;
1761                 }
1762         }
1763
1764         return 0;
1765 }
1766
1767 static void ip6erspan_set_version(struct nlattr *data[],
1768                                   struct __ip6_tnl_parm *parms)
1769 {
1770         if (!data)
1771                 return;
1772
1773         parms->erspan_ver = 1;
1774         if (data[IFLA_GRE_ERSPAN_VER])
1775                 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1776
1777         if (parms->erspan_ver == 1) {
1778                 if (data[IFLA_GRE_ERSPAN_INDEX])
1779                         parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1780         } else if (parms->erspan_ver == 2) {
1781                 if (data[IFLA_GRE_ERSPAN_DIR])
1782                         parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1783                 if (data[IFLA_GRE_ERSPAN_HWID])
1784                         parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1785         }
1786 }
1787
1788 static void ip6gre_netlink_parms(struct nlattr *data[],
1789                                 struct __ip6_tnl_parm *parms)
1790 {
1791         memset(parms, 0, sizeof(*parms));
1792
1793         if (!data)
1794                 return;
1795
1796         if (data[IFLA_GRE_LINK])
1797                 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1798
1799         if (data[IFLA_GRE_IFLAGS])
1800                 parms->i_flags = gre_flags_to_tnl_flags(
1801                                 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1802
1803         if (data[IFLA_GRE_OFLAGS])
1804                 parms->o_flags = gre_flags_to_tnl_flags(
1805                                 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1806
1807         if (data[IFLA_GRE_IKEY])
1808                 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1809
1810         if (data[IFLA_GRE_OKEY])
1811                 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1812
1813         if (data[IFLA_GRE_LOCAL])
1814                 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1815
1816         if (data[IFLA_GRE_REMOTE])
1817                 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1818
1819         if (data[IFLA_GRE_TTL])
1820                 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1821
1822         if (data[IFLA_GRE_ENCAP_LIMIT])
1823                 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1824
1825         if (data[IFLA_GRE_FLOWINFO])
1826                 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1827
1828         if (data[IFLA_GRE_FLAGS])
1829                 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1830
1831         if (data[IFLA_GRE_FWMARK])
1832                 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1833
1834         if (data[IFLA_GRE_COLLECT_METADATA])
1835                 parms->collect_md = true;
1836 }
1837
1838 static int ip6gre_tap_init(struct net_device *dev)
1839 {
1840         int ret;
1841
1842         ret = ip6gre_tunnel_init_common(dev);
1843         if (ret)
1844                 return ret;
1845
1846         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1847
1848         return 0;
1849 }
1850
1851 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1852         .ndo_init = ip6gre_tap_init,
1853         .ndo_uninit = ip6gre_tunnel_uninit,
1854         .ndo_start_xmit = ip6gre_tunnel_xmit,
1855         .ndo_set_mac_address = eth_mac_addr,
1856         .ndo_validate_addr = eth_validate_addr,
1857         .ndo_change_mtu = ip6_tnl_change_mtu,
1858         .ndo_get_stats64 = dev_get_tstats64,
1859         .ndo_get_iflink = ip6_tnl_get_iflink,
1860 };
1861
1862 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1863 {
1864         int t_hlen;
1865
1866         tunnel->tun_hlen = 8;
1867         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1868                        erspan_hdr_len(tunnel->parms.erspan_ver);
1869
1870         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1871         tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1872         return t_hlen;
1873 }
1874
1875 static int ip6erspan_tap_init(struct net_device *dev)
1876 {
1877         struct ip6_tnl *tunnel;
1878         int t_hlen;
1879         int ret;
1880
1881         tunnel = netdev_priv(dev);
1882
1883         tunnel->dev = dev;
1884         tunnel->net = dev_net(dev);
1885         strcpy(tunnel->parms.name, dev->name);
1886
1887         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1888         if (!dev->tstats)
1889                 return -ENOMEM;
1890
1891         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1892         if (ret)
1893                 goto cleanup_alloc_pcpu_stats;
1894
1895         ret = gro_cells_init(&tunnel->gro_cells, dev);
1896         if (ret)
1897                 goto cleanup_dst_cache_init;
1898
1899         t_hlen = ip6erspan_calc_hlen(tunnel);
1900         dev->mtu = ETH_DATA_LEN - t_hlen;
1901         if (dev->type == ARPHRD_ETHER)
1902                 dev->mtu -= ETH_HLEN;
1903         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1904                 dev->mtu -= 8;
1905
1906         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1907         ip6erspan_tnl_link_config(tunnel, 1);
1908
1909         netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL);
1910         netdev_lockdep_set_classes(dev);
1911         return 0;
1912
1913 cleanup_dst_cache_init:
1914         dst_cache_destroy(&tunnel->dst_cache);
1915 cleanup_alloc_pcpu_stats:
1916         free_percpu(dev->tstats);
1917         dev->tstats = NULL;
1918         return ret;
1919 }
1920
1921 static const struct net_device_ops ip6erspan_netdev_ops = {
1922         .ndo_init =             ip6erspan_tap_init,
1923         .ndo_uninit =           ip6erspan_tunnel_uninit,
1924         .ndo_start_xmit =       ip6erspan_tunnel_xmit,
1925         .ndo_set_mac_address =  eth_mac_addr,
1926         .ndo_validate_addr =    eth_validate_addr,
1927         .ndo_change_mtu =       ip6_tnl_change_mtu,
1928         .ndo_get_stats64 =      dev_get_tstats64,
1929         .ndo_get_iflink =       ip6_tnl_get_iflink,
1930 };
1931
1932 static void ip6gre_tap_setup(struct net_device *dev)
1933 {
1934
1935         ether_setup(dev);
1936
1937         dev->max_mtu = 0;
1938         dev->netdev_ops = &ip6gre_tap_netdev_ops;
1939         dev->needs_free_netdev = true;
1940         dev->priv_destructor = ip6gre_dev_free;
1941
1942         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1943         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1944         netif_keep_dst(dev);
1945 }
1946
1947 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1948                                        struct ip_tunnel_encap *ipencap)
1949 {
1950         bool ret = false;
1951
1952         memset(ipencap, 0, sizeof(*ipencap));
1953
1954         if (!data)
1955                 return ret;
1956
1957         if (data[IFLA_GRE_ENCAP_TYPE]) {
1958                 ret = true;
1959                 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1960         }
1961
1962         if (data[IFLA_GRE_ENCAP_FLAGS]) {
1963                 ret = true;
1964                 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1965         }
1966
1967         if (data[IFLA_GRE_ENCAP_SPORT]) {
1968                 ret = true;
1969                 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1970         }
1971
1972         if (data[IFLA_GRE_ENCAP_DPORT]) {
1973                 ret = true;
1974                 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1975         }
1976
1977         return ret;
1978 }
1979
1980 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1981                                  struct nlattr *tb[], struct nlattr *data[],
1982                                  struct netlink_ext_ack *extack)
1983 {
1984         struct ip6_tnl *nt;
1985         struct ip_tunnel_encap ipencap;
1986         int err;
1987
1988         nt = netdev_priv(dev);
1989
1990         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1991                 int err = ip6_tnl_encap_setup(nt, &ipencap);
1992
1993                 if (err < 0)
1994                         return err;
1995         }
1996
1997         if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1998                 eth_hw_addr_random(dev);
1999
2000         nt->dev = dev;
2001         nt->net = dev_net(dev);
2002
2003         err = register_netdevice(dev);
2004         if (err)
2005                 goto out;
2006
2007         if (tb[IFLA_MTU])
2008                 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2009
2010 out:
2011         return err;
2012 }
2013
2014 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2015                           struct nlattr *tb[], struct nlattr *data[],
2016                           struct netlink_ext_ack *extack)
2017 {
2018         struct ip6_tnl *nt = netdev_priv(dev);
2019         struct net *net = dev_net(dev);
2020         struct ip6gre_net *ign;
2021         int err;
2022
2023         ip6gre_netlink_parms(data, &nt->parms);
2024         ign = net_generic(net, ip6gre_net_id);
2025
2026         if (nt->parms.collect_md) {
2027                 if (rtnl_dereference(ign->collect_md_tun))
2028                         return -EEXIST;
2029         } else {
2030                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2031                         return -EEXIST;
2032         }
2033
2034         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2035         if (!err) {
2036                 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2037                 ip6gre_tunnel_link_md(ign, nt);
2038                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2039         }
2040         return err;
2041 }
2042
2043 static struct ip6_tnl *
2044 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2045                          struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2046                          struct netlink_ext_ack *extack)
2047 {
2048         struct ip6_tnl *t, *nt = netdev_priv(dev);
2049         struct net *net = nt->net;
2050         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2051         struct ip_tunnel_encap ipencap;
2052
2053         if (dev == ign->fb_tunnel_dev)
2054                 return ERR_PTR(-EINVAL);
2055
2056         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2057                 int err = ip6_tnl_encap_setup(nt, &ipencap);
2058
2059                 if (err < 0)
2060                         return ERR_PTR(err);
2061         }
2062
2063         ip6gre_netlink_parms(data, p_p);
2064
2065         t = ip6gre_tunnel_locate(net, p_p, 0);
2066
2067         if (t) {
2068                 if (t->dev != dev)
2069                         return ERR_PTR(-EEXIST);
2070         } else {
2071                 t = nt;
2072         }
2073
2074         return t;
2075 }
2076
2077 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2078                              struct nlattr *data[],
2079                              struct netlink_ext_ack *extack)
2080 {
2081         struct ip6_tnl *t = netdev_priv(dev);
2082         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2083         struct __ip6_tnl_parm p;
2084
2085         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2086         if (IS_ERR(t))
2087                 return PTR_ERR(t);
2088
2089         ip6gre_tunnel_unlink_md(ign, t);
2090         ip6gre_tunnel_unlink(ign, t);
2091         ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2092         ip6gre_tunnel_link_md(ign, t);
2093         ip6gre_tunnel_link(ign, t);
2094         return 0;
2095 }
2096
2097 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2098 {
2099         struct net *net = dev_net(dev);
2100         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2101
2102         if (dev != ign->fb_tunnel_dev)
2103                 unregister_netdevice_queue(dev, head);
2104 }
2105
2106 static size_t ip6gre_get_size(const struct net_device *dev)
2107 {
2108         return
2109                 /* IFLA_GRE_LINK */
2110                 nla_total_size(4) +
2111                 /* IFLA_GRE_IFLAGS */
2112                 nla_total_size(2) +
2113                 /* IFLA_GRE_OFLAGS */
2114                 nla_total_size(2) +
2115                 /* IFLA_GRE_IKEY */
2116                 nla_total_size(4) +
2117                 /* IFLA_GRE_OKEY */
2118                 nla_total_size(4) +
2119                 /* IFLA_GRE_LOCAL */
2120                 nla_total_size(sizeof(struct in6_addr)) +
2121                 /* IFLA_GRE_REMOTE */
2122                 nla_total_size(sizeof(struct in6_addr)) +
2123                 /* IFLA_GRE_TTL */
2124                 nla_total_size(1) +
2125                 /* IFLA_GRE_ENCAP_LIMIT */
2126                 nla_total_size(1) +
2127                 /* IFLA_GRE_FLOWINFO */
2128                 nla_total_size(4) +
2129                 /* IFLA_GRE_FLAGS */
2130                 nla_total_size(4) +
2131                 /* IFLA_GRE_ENCAP_TYPE */
2132                 nla_total_size(2) +
2133                 /* IFLA_GRE_ENCAP_FLAGS */
2134                 nla_total_size(2) +
2135                 /* IFLA_GRE_ENCAP_SPORT */
2136                 nla_total_size(2) +
2137                 /* IFLA_GRE_ENCAP_DPORT */
2138                 nla_total_size(2) +
2139                 /* IFLA_GRE_COLLECT_METADATA */
2140                 nla_total_size(0) +
2141                 /* IFLA_GRE_FWMARK */
2142                 nla_total_size(4) +
2143                 /* IFLA_GRE_ERSPAN_INDEX */
2144                 nla_total_size(4) +
2145                 0;
2146 }
2147
2148 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2149 {
2150         struct ip6_tnl *t = netdev_priv(dev);
2151         struct __ip6_tnl_parm *p = &t->parms;
2152         __be16 o_flags = p->o_flags;
2153
2154         if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2155                 if (!p->collect_md)
2156                         o_flags |= TUNNEL_KEY;
2157
2158                 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2159                         goto nla_put_failure;
2160
2161                 if (p->erspan_ver == 1) {
2162                         if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2163                                 goto nla_put_failure;
2164                 } else {
2165                         if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2166                                 goto nla_put_failure;
2167                         if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2168                                 goto nla_put_failure;
2169                 }
2170         }
2171
2172         if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2173             nla_put_be16(skb, IFLA_GRE_IFLAGS,
2174                          gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2175             nla_put_be16(skb, IFLA_GRE_OFLAGS,
2176                          gre_tnl_flags_to_gre_flags(o_flags)) ||
2177             nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2178             nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2179             nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2180             nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2181             nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2182             nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2183             nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2184             nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2185             nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2186                 goto nla_put_failure;
2187
2188         if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2189                         t->encap.type) ||
2190             nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2191                          t->encap.sport) ||
2192             nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2193                          t->encap.dport) ||
2194             nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2195                         t->encap.flags))
2196                 goto nla_put_failure;
2197
2198         if (p->collect_md) {
2199                 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2200                         goto nla_put_failure;
2201         }
2202
2203         return 0;
2204
2205 nla_put_failure:
2206         return -EMSGSIZE;
2207 }
2208
2209 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2210         [IFLA_GRE_LINK]        = { .type = NLA_U32 },
2211         [IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2212         [IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2213         [IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2214         [IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2215         [IFLA_GRE_LOCAL]       = { .len = sizeof_field(struct ipv6hdr, saddr) },
2216         [IFLA_GRE_REMOTE]      = { .len = sizeof_field(struct ipv6hdr, daddr) },
2217         [IFLA_GRE_TTL]         = { .type = NLA_U8 },
2218         [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2219         [IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2220         [IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2221         [IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2222         [IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2223         [IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2224         [IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2225         [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2226         [IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2227         [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2228         [IFLA_GRE_ERSPAN_VER]   = { .type = NLA_U8 },
2229         [IFLA_GRE_ERSPAN_DIR]   = { .type = NLA_U8 },
2230         [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
2231 };
2232
2233 static void ip6erspan_tap_setup(struct net_device *dev)
2234 {
2235         ether_setup(dev);
2236
2237         dev->max_mtu = 0;
2238         dev->netdev_ops = &ip6erspan_netdev_ops;
2239         dev->needs_free_netdev = true;
2240         dev->priv_destructor = ip6gre_dev_free;
2241
2242         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2243         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2244         netif_keep_dst(dev);
2245 }
2246
2247 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2248                              struct nlattr *tb[], struct nlattr *data[],
2249                              struct netlink_ext_ack *extack)
2250 {
2251         struct ip6_tnl *nt = netdev_priv(dev);
2252         struct net *net = dev_net(dev);
2253         struct ip6gre_net *ign;
2254         int err;
2255
2256         ip6gre_netlink_parms(data, &nt->parms);
2257         ip6erspan_set_version(data, &nt->parms);
2258         ign = net_generic(net, ip6gre_net_id);
2259
2260         if (nt->parms.collect_md) {
2261                 if (rtnl_dereference(ign->collect_md_tun_erspan))
2262                         return -EEXIST;
2263         } else {
2264                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2265                         return -EEXIST;
2266         }
2267
2268         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2269         if (!err) {
2270                 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2271                 ip6erspan_tunnel_link_md(ign, nt);
2272                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2273         }
2274         return err;
2275 }
2276
2277 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2278 {
2279         ip6gre_tnl_link_config_common(t);
2280         ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2281 }
2282
2283 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2284                                 const struct __ip6_tnl_parm *p, int set_mtu)
2285 {
2286         ip6gre_tnl_copy_tnl_parm(t, p);
2287         ip6erspan_tnl_link_config(t, set_mtu);
2288         return 0;
2289 }
2290
2291 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2292                                 struct nlattr *data[],
2293                                 struct netlink_ext_ack *extack)
2294 {
2295         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2296         struct __ip6_tnl_parm p;
2297         struct ip6_tnl *t;
2298
2299         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2300         if (IS_ERR(t))
2301                 return PTR_ERR(t);
2302
2303         ip6erspan_set_version(data, &p);
2304         ip6gre_tunnel_unlink_md(ign, t);
2305         ip6gre_tunnel_unlink(ign, t);
2306         ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2307         ip6erspan_tunnel_link_md(ign, t);
2308         ip6gre_tunnel_link(ign, t);
2309         return 0;
2310 }
2311
2312 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2313         .kind           = "ip6gre",
2314         .maxtype        = IFLA_GRE_MAX,
2315         .policy         = ip6gre_policy,
2316         .priv_size      = sizeof(struct ip6_tnl),
2317         .setup          = ip6gre_tunnel_setup,
2318         .validate       = ip6gre_tunnel_validate,
2319         .newlink        = ip6gre_newlink,
2320         .changelink     = ip6gre_changelink,
2321         .dellink        = ip6gre_dellink,
2322         .get_size       = ip6gre_get_size,
2323         .fill_info      = ip6gre_fill_info,
2324         .get_link_net   = ip6_tnl_get_link_net,
2325 };
2326
2327 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2328         .kind           = "ip6gretap",
2329         .maxtype        = IFLA_GRE_MAX,
2330         .policy         = ip6gre_policy,
2331         .priv_size      = sizeof(struct ip6_tnl),
2332         .setup          = ip6gre_tap_setup,
2333         .validate       = ip6gre_tap_validate,
2334         .newlink        = ip6gre_newlink,
2335         .changelink     = ip6gre_changelink,
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 ip6erspan_tap_ops __read_mostly = {
2342         .kind           = "ip6erspan",
2343         .maxtype        = IFLA_GRE_MAX,
2344         .policy         = ip6gre_policy,
2345         .priv_size      = sizeof(struct ip6_tnl),
2346         .setup          = ip6erspan_tap_setup,
2347         .validate       = ip6erspan_tap_validate,
2348         .newlink        = ip6erspan_newlink,
2349         .changelink     = ip6erspan_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 /*
2356  *      And now the modules code and kernel interface.
2357  */
2358
2359 static int __init ip6gre_init(void)
2360 {
2361         int err;
2362
2363         pr_info("GRE over IPv6 tunneling driver\n");
2364
2365         err = register_pernet_device(&ip6gre_net_ops);
2366         if (err < 0)
2367                 return err;
2368
2369         err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2370         if (err < 0) {
2371                 pr_info("%s: can't add protocol\n", __func__);
2372                 goto add_proto_failed;
2373         }
2374
2375         err = rtnl_link_register(&ip6gre_link_ops);
2376         if (err < 0)
2377                 goto rtnl_link_failed;
2378
2379         err = rtnl_link_register(&ip6gre_tap_ops);
2380         if (err < 0)
2381                 goto tap_ops_failed;
2382
2383         err = rtnl_link_register(&ip6erspan_tap_ops);
2384         if (err < 0)
2385                 goto erspan_link_failed;
2386
2387 out:
2388         return err;
2389
2390 erspan_link_failed:
2391         rtnl_link_unregister(&ip6gre_tap_ops);
2392 tap_ops_failed:
2393         rtnl_link_unregister(&ip6gre_link_ops);
2394 rtnl_link_failed:
2395         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2396 add_proto_failed:
2397         unregister_pernet_device(&ip6gre_net_ops);
2398         goto out;
2399 }
2400
2401 static void __exit ip6gre_fini(void)
2402 {
2403         rtnl_link_unregister(&ip6gre_tap_ops);
2404         rtnl_link_unregister(&ip6gre_link_ops);
2405         rtnl_link_unregister(&ip6erspan_tap_ops);
2406         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2407         unregister_pernet_device(&ip6gre_net_ops);
2408 }
2409
2410 module_init(ip6gre_init);
2411 module_exit(ip6gre_fini);
2412 MODULE_LICENSE("GPL");
2413 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2414 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2415 MODULE_ALIAS_RTNL_LINK("ip6gre");
2416 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2417 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2418 MODULE_ALIAS_NETDEV("ip6gre0");