net/ipv6/ip6_gre.c

   1 /*
   2  *      GRE over IPv6 protocol decoder.
   3  *
   4  *      Authors: Dmitry Kozlov (xeb@mail.ru)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  *
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/capability.h>
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/slab.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/in.h>
  24 #include <linux/tcp.h>
  25 #include <linux/udp.h>
  26 #include <linux/if_arp.h>
  27 #include <linux/init.h>
  28 #include <linux/in6.h>
  29 #include <linux/inetdevice.h>
  30 #include <linux/igmp.h>
  31 #include <linux/netfilter_ipv4.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/if_ether.h>
  34 #include <linux/hash.h>
  35 #include <linux/if_tunnel.h>
  36 #include <linux/ip6_tunnel.h>
  37
  38 #include <net/sock.h>
  39 #include <net/ip.h>
  40 #include <net/ip_tunnels.h>
  41 #include <net/icmp.h>
  42 #include <net/protocol.h>
  43 #include <net/addrconf.h>
  44 #include <net/arp.h>
  45 #include <net/checksum.h>
  46 #include <net/dsfield.h>
  47 #include <net/inet_ecn.h>
  48 #include <net/xfrm.h>
  49 #include <net/net_namespace.h>
  50 #include <net/netns/generic.h>
  51 #include <net/rtnetlink.h>
  52
  53 #include <net/ipv6.h>
  54 #include <net/ip6_fib.h>
  55 #include <net/ip6_route.h>
  56 #include <net/ip6_tunnel.h>
  57 #include <net/gre.h>
  58 #include <net/erspan.h>
  59 #include <net/dst_metadata.h>
  60
  61
  62 static bool log_ecn_error = true;
  63 module_param(log_ecn_error, bool, 0644);
  64 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  65
  66 #define IP6_GRE_HASH_SIZE_SHIFT  5
  67 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
  68
  69 static unsigned int ip6gre_net_id __read_mostly;
  70 struct ip6gre_net {
  71         struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
  72
  73         struct ip6_tnl __rcu *collect_md_tun;
  74         struct ip6_tnl __rcu *collect_md_tun_erspan;
  75         struct net_device *fb_tunnel_dev;
  76 };
  77
  78 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
  79 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
  80 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
  81 static int ip6gre_tunnel_init(struct net_device *dev);
  82 static void ip6gre_tunnel_setup(struct net_device *dev);
  83 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
  84 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  85 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  86
  87 /* Tunnel hash table */
  88
  89 /*
  90    4 hash tables:
  91
  92    3: (remote,local)
  93    2: (remote,*)
  94    1: (*,local)
  95    0: (*,*)
  96
  97    We require exact key match i.e. if a key is present in packet
  98    it will match only tunnel with the same key; if it is not present,
  99    it will match only keyless tunnel.
 100
 101    All keysless packets, if not matched configured keyless tunnels
 102    will match fallback tunnel.
 103  */
 104
 105 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
 106 static u32 HASH_ADDR(const struct in6_addr *addr)
 107 {
 108         u32 hash = ipv6_addr_hash(addr);
 109
 110         return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
 111 }
 112
 113 #define tunnels_r_l     tunnels[3]
 114 #define tunnels_r       tunnels[2]
 115 #define tunnels_l       tunnels[1]
 116 #define tunnels_wc      tunnels[0]
 117
 118 /* Given src, dst and key, find appropriate for input tunnel. */
 119
 120 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
 121                 const struct in6_addr *remote, const struct in6_addr *local,
 122                 __be32 key, __be16 gre_proto)
 123 {
 124         struct net *net = dev_net(dev);
 125         int link = dev->ifindex;
 126         unsigned int h0 = HASH_ADDR(remote);
 127         unsigned int h1 = HASH_KEY(key);
 128         struct ip6_tnl *t, *cand = NULL;
 129         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 130         int dev_type = (gre_proto == htons(ETH_P_TEB) ||
 131                         gre_proto == htons(ETH_P_ERSPAN) ||
 132                         gre_proto == htons(ETH_P_ERSPAN2)) ?
 133                        ARPHRD_ETHER : ARPHRD_IP6GRE;
 134         int score, cand_score = 4;
 135         struct net_device *ndev;
 136
 137         for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
 138                 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
 139                     !ipv6_addr_equal(remote, &t->parms.raddr) ||
 140                     key != t->parms.i_key ||
 141                     !(t->dev->flags & IFF_UP))
 142                         continue;
 143
 144                 if (t->dev->type != ARPHRD_IP6GRE &&
 145                     t->dev->type != dev_type)
 146                         continue;
 147
 148                 score = 0;
 149                 if (t->parms.link != link)
 150                         score |= 1;
 151                 if (t->dev->type != dev_type)
 152                         score |= 2;
 153                 if (score == 0)
 154                         return t;
 155
 156                 if (score < cand_score) {
 157                         cand = t;
 158                         cand_score = score;
 159                 }
 160         }
 161
 162         for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
 163                 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
 164                     key != t->parms.i_key ||
 165                     !(t->dev->flags & IFF_UP))
 166                         continue;
 167
 168                 if (t->dev->type != ARPHRD_IP6GRE &&
 169                     t->dev->type != dev_type)
 170                         continue;
 171
 172                 score = 0;
 173                 if (t->parms.link != link)
 174                         score |= 1;
 175                 if (t->dev->type != dev_type)
 176                         score |= 2;
 177                 if (score == 0)
 178                         return t;
 179
 180                 if (score < cand_score) {
 181                         cand = t;
 182                         cand_score = score;
 183                 }
 184         }
 185
 186         for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
 187                 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
 188                           (!ipv6_addr_equal(local, &t->parms.raddr) ||
 189                                  !ipv6_addr_is_multicast(local))) ||
 190                     key != t->parms.i_key ||
 191                     !(t->dev->flags & IFF_UP))
 192                         continue;
 193
 194                 if (t->dev->type != ARPHRD_IP6GRE &&
 195                     t->dev->type != dev_type)
 196                         continue;
 197
 198                 score = 0;
 199                 if (t->parms.link != link)
 200                         score |= 1;
 201                 if (t->dev->type != dev_type)
 202                         score |= 2;
 203                 if (score == 0)
 204                         return t;
 205
 206                 if (score < cand_score) {
 207                         cand = t;
 208                         cand_score = score;
 209                 }
 210         }
 211
 212         for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
 213                 if (t->parms.i_key != key ||
 214                     !(t->dev->flags & IFF_UP))
 215                         continue;
 216
 217                 if (t->dev->type != ARPHRD_IP6GRE &&
 218                     t->dev->type != dev_type)
 219                         continue;
 220
 221                 score = 0;
 222                 if (t->parms.link != link)
 223                         score |= 1;
 224                 if (t->dev->type != dev_type)
 225                         score |= 2;
 226                 if (score == 0)
 227                         return t;
 228
 229                 if (score < cand_score) {
 230                         cand = t;
 231                         cand_score = score;
 232                 }
 233         }
 234
 235         if (cand)
 236                 return cand;
 237
 238         if (gre_proto == htons(ETH_P_ERSPAN) ||
 239             gre_proto == htons(ETH_P_ERSPAN2))
 240                 t = rcu_dereference(ign->collect_md_tun_erspan);
 241         else
 242                 t = rcu_dereference(ign->collect_md_tun);
 243
 244         if (t && t->dev->flags & IFF_UP)
 245                 return t;
 246
 247         ndev = READ_ONCE(ign->fb_tunnel_dev);
 248         if (ndev && ndev->flags & IFF_UP)
 249                 return netdev_priv(ndev);
 250
 251         return NULL;
 252 }
 253
 254 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
 255                 const struct __ip6_tnl_parm *p)
 256 {
 257         const struct in6_addr *remote = &p->raddr;
 258         const struct in6_addr *local = &p->laddr;
 259         unsigned int h = HASH_KEY(p->i_key);
 260         int prio = 0;
 261
 262         if (!ipv6_addr_any(local))
 263                 prio |= 1;
 264         if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
 265                 prio |= 2;
 266                 h ^= HASH_ADDR(remote);
 267         }
 268
 269         return &ign->tunnels[prio][h];
 270 }
 271
 272 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 273 {
 274         if (t->parms.collect_md)
 275                 rcu_assign_pointer(ign->collect_md_tun, t);
 276 }
 277
 278 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 279 {
 280         if (t->parms.collect_md)
 281                 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
 282 }
 283
 284 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 285 {
 286         if (t->parms.collect_md)
 287                 rcu_assign_pointer(ign->collect_md_tun, NULL);
 288 }
 289
 290 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
 291                                        struct ip6_tnl *t)
 292 {
 293         if (t->parms.collect_md)
 294                 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
 295 }
 296
 297 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
 298                 const struct ip6_tnl *t)
 299 {
 300         return __ip6gre_bucket(ign, &t->parms);
 301 }
 302
 303 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
 304 {
 305         struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
 306
 307         rcu_assign_pointer(t->next, rtnl_dereference(*tp));
 308         rcu_assign_pointer(*tp, t);
 309 }
 310
 311 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
 312 {
 313         struct ip6_tnl __rcu **tp;
 314         struct ip6_tnl *iter;
 315
 316         for (tp = ip6gre_bucket(ign, t);
 317              (iter = rtnl_dereference(*tp)) != NULL;
 318              tp = &iter->next) {
 319                 if (t == iter) {
 320                         rcu_assign_pointer(*tp, t->next);
 321                         break;
 322                 }
 323         }
 324 }
 325
 326 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
 327                                            const struct __ip6_tnl_parm *parms,
 328                                            int type)
 329 {
 330         const struct in6_addr *remote = &parms->raddr;
 331         const struct in6_addr *local = &parms->laddr;
 332         __be32 key = parms->i_key;
 333         int link = parms->link;
 334         struct ip6_tnl *t;
 335         struct ip6_tnl __rcu **tp;
 336         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 337
 338         for (tp = __ip6gre_bucket(ign, parms);
 339              (t = rtnl_dereference(*tp)) != NULL;
 340              tp = &t->next)
 341                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
 342                     ipv6_addr_equal(remote, &t->parms.raddr) &&
 343                     key == t->parms.i_key &&
 344                     link == t->parms.link &&
 345                     type == t->dev->type)
 346                         break;
 347
 348         return t;
 349 }
 350
 351 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
 352                 const struct __ip6_tnl_parm *parms, int create)
 353 {
 354         struct ip6_tnl *t, *nt;
 355         struct net_device *dev;
 356         char name[IFNAMSIZ];
 357         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 358
 359         t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
 360         if (t && create)
 361                 return NULL;
 362         if (t || !create)
 363                 return t;
 364
 365         if (parms->name[0]) {
 366                 if (!dev_valid_name(parms->name))
 367                         return NULL;
 368                 strlcpy(name, parms->name, IFNAMSIZ);
 369         } else {
 370                 strcpy(name, "ip6gre%d");
 371         }
 372         dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
 373                            ip6gre_tunnel_setup);
 374         if (!dev)
 375                 return NULL;
 376
 377         dev_net_set(dev, net);
 378
 379         nt = netdev_priv(dev);
 380         nt->parms = *parms;
 381         dev->rtnl_link_ops = &ip6gre_link_ops;
 382
 383         nt->dev = dev;
 384         nt->net = dev_net(dev);
 385
 386         if (register_netdevice(dev) < 0)
 387                 goto failed_free;
 388
 389         ip6gre_tnl_link_config(nt, 1);
 390
 391         /* Can use a lockless transmit, unless we generate output sequences */
 392         if (!(nt->parms.o_flags & TUNNEL_SEQ))
 393                 dev->features |= NETIF_F_LLTX;
 394
 395         ip6gre_tunnel_link(ign, nt);
 396         return nt;
 397
 398 failed_free:
 399         free_netdev(dev);
 400         return NULL;
 401 }
 402
 403 static void ip6erspan_tunnel_uninit(struct net_device *dev)
 404 {
 405         struct ip6_tnl *t = netdev_priv(dev);
 406         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 407
 408         ip6erspan_tunnel_unlink_md(ign, t);
 409         ip6gre_tunnel_unlink(ign, t);
 410         dst_cache_reset(&t->dst_cache);
 411         dev_put(dev);
 412 }
 413
 414 static void ip6gre_tunnel_uninit(struct net_device *dev)
 415 {
 416         struct ip6_tnl *t = netdev_priv(dev);
 417         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 418
 419         ip6gre_tunnel_unlink_md(ign, t);
 420         ip6gre_tunnel_unlink(ign, t);
 421         if (ign->fb_tunnel_dev == dev)
 422                 WRITE_ONCE(ign->fb_tunnel_dev, NULL);
 423         dst_cache_reset(&t->dst_cache);
 424         dev_put(dev);
 425 }
 426
 427
 428 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 429                        u8 type, u8 code, int offset, __be32 info)
 430 {
 431         struct net *net = dev_net(skb->dev);
 432         const struct gre_base_hdr *greh;
 433         const struct ipv6hdr *ipv6h;
 434         int grehlen = sizeof(*greh);
 435         struct ip6_tnl *t;
 436         int key_off = 0;
 437         __be16 flags;
 438         __be32 key;
 439
 440         if (!pskb_may_pull(skb, offset + grehlen))
 441                 return;
 442         greh = (const struct gre_base_hdr *)(skb->data + offset);
 443         flags = greh->flags;
 444         if (flags & (GRE_VERSION | GRE_ROUTING))
 445                 return;
 446         if (flags & GRE_CSUM)
 447                 grehlen += 4;
 448         if (flags & GRE_KEY) {
 449                 key_off = grehlen + offset;
 450                 grehlen += 4;
 451         }
 452
 453         if (!pskb_may_pull(skb, offset + grehlen))
 454                 return;
 455         ipv6h = (const struct ipv6hdr *)skb->data;
 456         greh = (const struct gre_base_hdr *)(skb->data + offset);
 457         key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
 458
 459         t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
 460                                  key, greh->protocol);
 461         if (!t)
 462                 return;
 463
 464         switch (type) {
 465                 struct ipv6_tlv_tnl_enc_lim *tel;
 466                 __u32 teli;
 467         case ICMPV6_DEST_UNREACH:
 468                 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
 469                                     t->parms.name);
 470                 if (code != ICMPV6_PORT_UNREACH)
 471                         break;
 472                 return;
 473         case ICMPV6_TIME_EXCEED:
 474                 if (code == ICMPV6_EXC_HOPLIMIT) {
 475                         net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
 476                                             t->parms.name);
 477                         break;
 478                 }
 479                 return;
 480         case ICMPV6_PARAMPROB:
 481                 teli = 0;
 482                 if (code == ICMPV6_HDR_FIELD)
 483                         teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
 484
 485                 if (teli && teli == be32_to_cpu(info) - 2) {
 486                         tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
 487                         if (tel->encap_limit == 0) {
 488                                 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
 489                                                     t->parms.name);
 490                         }
 491                 } else {
 492                         net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
 493                                             t->parms.name);
 494                 }
 495                 return;
 496         case ICMPV6_PKT_TOOBIG:
 497                 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
 498                 return;
 499         case NDISC_REDIRECT:
 500                 ip6_redirect(skb, net, skb->dev->ifindex, 0,
 501                              sock_net_uid(net, NULL));
 502                 return;
 503         }
 504
 505         if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
 506                 t->err_count++;
 507         else
 508                 t->err_count = 1;
 509         t->err_time = jiffies;
 510 }
 511
 512 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
 513 {
 514         const struct ipv6hdr *ipv6h;
 515         struct ip6_tnl *tunnel;
 516
 517         ipv6h = ipv6_hdr(skb);
 518         tunnel = ip6gre_tunnel_lookup(skb->dev,
 519                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 520                                       tpi->proto);
 521         if (tunnel) {
 522                 if (tunnel->parms.collect_md) {
 523                         struct metadata_dst *tun_dst;
 524                         __be64 tun_id;
 525                         __be16 flags;
 526
 527                         flags = tpi->flags;
 528                         tun_id = key32_to_tunnel_id(tpi->key);
 529
 530                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
 531                         if (!tun_dst)
 532                                 return PACKET_REJECT;
 533
 534                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 535                 } else {
 536                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 537                 }
 538
 539                 return PACKET_RCVD;
 540         }
 541
 542         return PACKET_REJECT;
 543 }
 544
 545 static int ip6erspan_rcv(struct sk_buff *skb, struct tnl_ptk_info *tpi,
 546                          int gre_hdr_len)
 547 {
 548         struct erspan_base_hdr *ershdr;
 549         const struct ipv6hdr *ipv6h;
 550         struct erspan_md2 *md2;
 551         struct ip6_tnl *tunnel;
 552         u8 ver;
 553
 554         ipv6h = ipv6_hdr(skb);
 555         ershdr = (struct erspan_base_hdr *)skb->data;
 556         ver = ershdr->ver;
 557
 558         tunnel = ip6gre_tunnel_lookup(skb->dev,
 559                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 560                                       tpi->proto);
 561         if (tunnel) {
 562                 int len = erspan_hdr_len(ver);
 563
 564                 if (unlikely(!pskb_may_pull(skb, len)))
 565                         return PACKET_REJECT;
 566
 567                 if (__iptunnel_pull_header(skb, len,
 568                                            htons(ETH_P_TEB),
 569                                            false, false) < 0)
 570                         return PACKET_REJECT;
 571
 572                 if (tunnel->parms.collect_md) {
 573                         struct erspan_metadata *pkt_md, *md;
 574                         struct metadata_dst *tun_dst;
 575                         struct ip_tunnel_info *info;
 576                         unsigned char *gh;
 577                         __be64 tun_id;
 578                         __be16 flags;
 579
 580                         tpi->flags |= TUNNEL_KEY;
 581                         flags = tpi->flags;
 582                         tun_id = key32_to_tunnel_id(tpi->key);
 583
 584                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
 585                                                   sizeof(*md));
 586                         if (!tun_dst)
 587                                 return PACKET_REJECT;
 588
 589                         /* skb can be uncloned in __iptunnel_pull_header, so
 590                          * old pkt_md is no longer valid and we need to reset
 591                          * it
 592                          */
 593                         gh = skb_network_header(skb) +
 594                              skb_network_header_len(skb);
 595                         pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
 596                                                             sizeof(*ershdr));
 597                         info = &tun_dst->u.tun_info;
 598                         md = ip_tunnel_info_opts(info);
 599                         md->version = ver;
 600                         md2 = &md->u.md2;
 601                         memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
 602                                                        ERSPAN_V2_MDSIZE);
 603                         info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
 604                         info->options_len = sizeof(*md);
 605
 606                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 607
 608                 } else {
 609                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 610                 }
 611
 612                 return PACKET_RCVD;
 613         }
 614
 615         return PACKET_REJECT;
 616 }
 617
 618 static int gre_rcv(struct sk_buff *skb)
 619 {
 620         struct tnl_ptk_info tpi;
 621         bool csum_err = false;
 622         int hdr_len;
 623
 624         hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
 625         if (hdr_len < 0)
 626                 goto drop;
 627
 628         if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 629                 goto drop;
 630
 631         if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
 632                      tpi.proto == htons(ETH_P_ERSPAN2))) {
 633                 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
 634                         return 0;
 635                 goto out;
 636         }
 637
 638         if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 639                 return 0;
 640
 641 out:
 642         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 643 drop:
 644         kfree_skb(skb);
 645         return 0;
 646 }
 647
 648 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 649 {
 650         return iptunnel_handle_offloads(skb,
 651                                         csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 652 }
 653
 654 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
 655                                      struct net_device *dev,
 656                                      struct flowi6 *fl6, __u8 *dsfield,
 657                                      int *encap_limit)
 658 {
 659         const struct iphdr *iph = ip_hdr(skb);
 660         struct ip6_tnl *t = netdev_priv(dev);
 661
 662         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 663                 *encap_limit = t->parms.encap_limit;
 664
 665         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 666
 667         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 668                 *dsfield = ipv4_get_dsfield(iph);
 669         else
 670                 *dsfield = ip6_tclass(t->parms.flowinfo);
 671
 672         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 673                 fl6->flowi6_mark = skb->mark;
 674         else
 675                 fl6->flowi6_mark = t->parms.fwmark;
 676
 677         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 678 }
 679
 680 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
 681                                     struct net_device *dev,
 682                                     struct flowi6 *fl6, __u8 *dsfield,
 683                                     int *encap_limit)
 684 {
 685         struct ipv6hdr *ipv6h;
 686         struct ip6_tnl *t = netdev_priv(dev);
 687         __u16 offset;
 688
 689         offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
 690         /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
 691         ipv6h = ipv6_hdr(skb);
 692
 693         if (offset > 0) {
 694                 struct ipv6_tlv_tnl_enc_lim *tel;
 695
 696                 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
 697                 if (tel->encap_limit == 0) {
 698                         icmpv6_send(skb, ICMPV6_PARAMPROB,
 699                                     ICMPV6_HDR_FIELD, offset + 2);
 700                         return -1;
 701                 }
 702                 *encap_limit = tel->encap_limit - 1;
 703         } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
 704                 *encap_limit = t->parms.encap_limit;
 705         }
 706
 707         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 708
 709         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 710                 *dsfield = ipv6_get_dsfield(ipv6h);
 711         else
 712                 *dsfield = ip6_tclass(t->parms.flowinfo);
 713
 714         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 715                 fl6->flowlabel |= ip6_flowlabel(ipv6h);
 716
 717         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 718                 fl6->flowi6_mark = skb->mark;
 719         else
 720                 fl6->flowi6_mark = t->parms.fwmark;
 721
 722         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 723
 724         return 0;
 725 }
 726
 727 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
 728                                struct net_device *dev, __u8 dsfield,
 729                                struct flowi6 *fl6, int encap_limit,
 730                                __u32 *pmtu, __be16 proto)
 731 {
 732         struct ip6_tnl *tunnel = netdev_priv(dev);
 733         __be16 protocol;
 734         __be16 flags;
 735
 736         if (dev->type == ARPHRD_ETHER)
 737                 IPCB(skb)->flags = 0;
 738
 739         if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
 740                 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
 741         else
 742                 fl6->daddr = tunnel->parms.raddr;
 743
 744         /* Push GRE header. */
 745         protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
 746
 747         if (tunnel->parms.collect_md) {
 748                 struct ip_tunnel_info *tun_info;
 749                 const struct ip_tunnel_key *key;
 750                 int tun_hlen;
 751
 752                 tun_info = skb_tunnel_info(skb);
 753                 if (unlikely(!tun_info ||
 754                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
 755                              ip_tunnel_info_af(tun_info) != AF_INET6))
 756                         return -EINVAL;
 757
 758                 key = &tun_info->key;
 759                 memset(fl6, 0, sizeof(*fl6));
 760                 fl6->flowi6_proto = IPPROTO_GRE;
 761                 fl6->daddr = key->u.ipv6.dst;
 762                 fl6->flowlabel = key->label;
 763                 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 764
 765                 dsfield = key->tos;
 766                 flags = key->tun_flags &
 767                         (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
 768                 tun_hlen = gre_calc_hlen(flags);
 769
 770                 if (skb_cow_head(skb, dev->needed_headroom ?: tun_hlen + tunnel->encap_hlen))
 771                         return -ENOMEM;
 772
 773                 gre_build_header(skb, tun_hlen,
 774                                  flags, protocol,
 775                                  tunnel_id_to_key32(tun_info->key.tun_id),
 776                                  (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
 777                                                       : 0);
 778
 779         } else {
 780                 if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
 781                         return -ENOMEM;
 782
 783                 flags = tunnel->parms.o_flags;
 784
 785                 gre_build_header(skb, tunnel->tun_hlen, flags,
 786                                  protocol, tunnel->parms.o_key,
 787                                  (flags & TUNNEL_SEQ) ? htonl(atomic_fetch_inc(&tunnel->o_seqno))
 788                                                       : 0);
 789         }
 790
 791         return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
 792                             NEXTHDR_GRE);
 793 }
 794
 795 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
 796 {
 797         struct ip6_tnl *t = netdev_priv(dev);
 798         int encap_limit = -1;
 799         struct flowi6 fl6;
 800         __u8 dsfield = 0;
 801         __u32 mtu;
 802         int err;
 803
 804         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 805
 806         if (!t->parms.collect_md)
 807                 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
 808                                          &dsfield, &encap_limit);
 809
 810         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 811         if (err)
 812                 return -1;
 813
 814         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
 815                           skb->protocol);
 816         if (err != 0) {
 817                 /* XXX: send ICMP error even if DF is not set. */
 818                 if (err == -EMSGSIZE)
 819                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 820                                   htonl(mtu));
 821                 return -1;
 822         }
 823
 824         return 0;
 825 }
 826
 827 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
 828 {
 829         struct ip6_tnl *t = netdev_priv(dev);
 830         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 831         int encap_limit = -1;
 832         struct flowi6 fl6;
 833         __u8 dsfield = 0;
 834         __u32 mtu;
 835         int err;
 836
 837         if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
 838                 return -1;
 839
 840         if (!t->parms.collect_md &&
 841             prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
 842                 return -1;
 843
 844         if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
 845                 return -1;
 846
 847         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
 848                           &mtu, skb->protocol);
 849         if (err != 0) {
 850                 if (err == -EMSGSIZE)
 851                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 852                 return -1;
 853         }
 854
 855         return 0;
 856 }
 857
 858 /**
 859  * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
 860  *   @t: the outgoing tunnel device
 861  *   @hdr: IPv6 header from the incoming packet
 862  *
 863  * Description:
 864  *   Avoid trivial tunneling loop by checking that tunnel exit-point
 865  *   doesn't match source of incoming packet.
 866  *
 867  * Return:
 868  *   1 if conflict,
 869  *   0 else
 870  **/
 871
 872 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
 873         const struct ipv6hdr *hdr)
 874 {
 875         return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
 876 }
 877
 878 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
 879 {
 880         struct ip6_tnl *t = netdev_priv(dev);
 881         int encap_limit = -1;
 882         struct flowi6 fl6;
 883         __u32 mtu;
 884         int err;
 885
 886         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 887                 encap_limit = t->parms.encap_limit;
 888
 889         if (!t->parms.collect_md)
 890                 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
 891
 892         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 893         if (err)
 894                 return err;
 895
 896         err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
 897
 898         return err;
 899 }
 900
 901 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
 902         struct net_device *dev)
 903 {
 904         struct ip6_tnl *t = netdev_priv(dev);
 905         struct net_device_stats *stats = &t->dev->stats;
 906         int ret;
 907
 908         if (!pskb_inet_may_pull(skb))
 909                 goto tx_err;
 910
 911         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 912                 goto tx_err;
 913
 914         switch (skb->protocol) {
 915         case htons(ETH_P_IP):
 916                 ret = ip6gre_xmit_ipv4(skb, dev);
 917                 break;
 918         case htons(ETH_P_IPV6):
 919                 ret = ip6gre_xmit_ipv6(skb, dev);
 920                 break;
 921         default:
 922                 ret = ip6gre_xmit_other(skb, dev);
 923                 break;
 924         }
 925
 926         if (ret < 0)
 927                 goto tx_err;
 928
 929         return NETDEV_TX_OK;
 930
 931 tx_err:
 932         stats->tx_errors++;
 933         stats->tx_dropped++;
 934         kfree_skb(skb);
 935         return NETDEV_TX_OK;
 936 }
 937
 938 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 939                                          struct net_device *dev)
 940 {
 941         struct ip6_tnl *t = netdev_priv(dev);
 942         struct dst_entry *dst = skb_dst(skb);
 943         struct net_device_stats *stats;
 944         bool truncate = false;
 945         int encap_limit = -1;
 946         __u8 dsfield = false;
 947         struct flowi6 fl6;
 948         int err = -EINVAL;
 949         __be16 proto;
 950         __u32 mtu;
 951         int nhoff;
 952
 953         if (!pskb_inet_may_pull(skb))
 954                 goto tx_err;
 955
 956         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 957                 goto tx_err;
 958
 959         if (gre_handle_offloads(skb, false))
 960                 goto tx_err;
 961
 962         if (skb->len > dev->mtu + dev->hard_header_len) {
 963                 pskb_trim(skb, dev->mtu + dev->hard_header_len);
 964                 truncate = true;
 965         }
 966
 967         nhoff = skb_network_offset(skb);
 968         if (skb->protocol == htons(ETH_P_IP) &&
 969             (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
 970                 truncate = true;
 971
 972         if (skb->protocol == htons(ETH_P_IPV6)) {
 973                 int thoff;
 974
 975                 if (skb_transport_header_was_set(skb))
 976                         thoff = skb_transport_offset(skb);
 977                 else
 978                         thoff = nhoff + sizeof(struct ipv6hdr);
 979                 if (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff)
 980                         truncate = true;
 981         }
 982
 983         if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
 984                 goto tx_err;
 985
 986         t->parms.o_flags &= ~TUNNEL_KEY;
 987         IPCB(skb)->flags = 0;
 988
 989         /* For collect_md mode, derive fl6 from the tunnel key,
 990          * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
 991          */
 992         if (t->parms.collect_md) {
 993                 struct ip_tunnel_info *tun_info;
 994                 const struct ip_tunnel_key *key;
 995                 struct erspan_metadata *md;
 996                 __be32 tun_id;
 997
 998                 tun_info = skb_tunnel_info(skb);
 999                 if (unlikely(!tun_info ||
1000                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
1001                              ip_tunnel_info_af(tun_info) != AF_INET6))
1002                         goto tx_err;
1003
1004                 key = &tun_info->key;
1005                 memset(&fl6, 0, sizeof(fl6));
1006                 fl6.flowi6_proto = IPPROTO_GRE;
1007                 fl6.daddr = key->u.ipv6.dst;
1008                 fl6.flowlabel = key->label;
1009                 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
1010
1011                 dsfield = key->tos;
1012                 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
1013                         goto tx_err;
1014                 if (tun_info->options_len < sizeof(*md))
1015                         goto tx_err;
1016                 md = ip_tunnel_info_opts(tun_info);
1017
1018                 tun_id = tunnel_id_to_key32(key->tun_id);
1019                 if (md->version == 1) {
1020                         erspan_build_header(skb,
1021                                             ntohl(tun_id),
1022                                             ntohl(md->u.index), truncate,
1023                                             false);
1024                         proto = htons(ETH_P_ERSPAN);
1025                 } else if (md->version == 2) {
1026                         erspan_build_header_v2(skb,
1027                                                ntohl(tun_id),
1028                                                md->u.md2.dir,
1029                                                get_hwid(&md->u.md2),
1030                                                truncate, false);
1031                         proto = htons(ETH_P_ERSPAN2);
1032                 } else {
1033                         goto tx_err;
1034                 }
1035         } else {
1036                 switch (skb->protocol) {
1037                 case htons(ETH_P_IP):
1038                         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1039                         prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1040                                                  &dsfield, &encap_limit);
1041                         break;
1042                 case htons(ETH_P_IPV6):
1043                         if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1044                                 goto tx_err;
1045                         if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1046                                                      &dsfield, &encap_limit))
1047                                 goto tx_err;
1048                         break;
1049                 default:
1050                         memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1051                         break;
1052                 }
1053
1054                 if (t->parms.erspan_ver == 1) {
1055                         erspan_build_header(skb, ntohl(t->parms.o_key),
1056                                             t->parms.index,
1057                                             truncate, false);
1058                         proto = htons(ETH_P_ERSPAN);
1059                 } else if (t->parms.erspan_ver == 2) {
1060                         erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1061                                                t->parms.dir,
1062                                                t->parms.hwid,
1063                                                truncate, false);
1064                         proto = htons(ETH_P_ERSPAN2);
1065                 } else {
1066                         goto tx_err;
1067                 }
1068
1069                 fl6.daddr = t->parms.raddr;
1070         }
1071
1072         /* Push GRE header. */
1073         gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(atomic_fetch_inc(&t->o_seqno)));
1074
1075         /* TooBig packet may have updated dst->dev's mtu */
1076         if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1077                 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu, false);
1078
1079         err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1080                            NEXTHDR_GRE);
1081         if (err != 0) {
1082                 /* XXX: send ICMP error even if DF is not set. */
1083                 if (err == -EMSGSIZE) {
1084                         if (skb->protocol == htons(ETH_P_IP))
1085                                 icmp_send(skb, ICMP_DEST_UNREACH,
1086                                           ICMP_FRAG_NEEDED, htonl(mtu));
1087                         else
1088                                 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1089                 }
1090
1091                 goto tx_err;
1092         }
1093         return NETDEV_TX_OK;
1094
1095 tx_err:
1096         stats = &t->dev->stats;
1097         stats->tx_errors++;
1098         stats->tx_dropped++;
1099         kfree_skb(skb);
1100         return NETDEV_TX_OK;
1101 }
1102
1103 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1104 {
1105         struct net_device *dev = t->dev;
1106         struct __ip6_tnl_parm *p = &t->parms;
1107         struct flowi6 *fl6 = &t->fl.u.ip6;
1108
1109         if (dev->type != ARPHRD_ETHER) {
1110                 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1111                 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1112         }
1113
1114         /* Set up flowi template */
1115         fl6->saddr = p->laddr;
1116         fl6->daddr = p->raddr;
1117         fl6->flowi6_oif = p->link;
1118         fl6->flowlabel = 0;
1119         fl6->flowi6_proto = IPPROTO_GRE;
1120
1121         if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1122                 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1123         if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1124                 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1125
1126         p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1127         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1128
1129         if (p->flags&IP6_TNL_F_CAP_XMIT &&
1130                         p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1131                 dev->flags |= IFF_POINTOPOINT;
1132         else
1133                 dev->flags &= ~IFF_POINTOPOINT;
1134 }
1135
1136 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1137                                          int t_hlen)
1138 {
1139         const struct __ip6_tnl_parm *p = &t->parms;
1140         struct net_device *dev = t->dev;
1141
1142         if (p->flags & IP6_TNL_F_CAP_XMIT) {
1143                 int strict = (ipv6_addr_type(&p->raddr) &
1144                               (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1145
1146                 struct rt6_info *rt = rt6_lookup(t->net,
1147                                                  &p->raddr, &p->laddr,
1148                                                  p->link, NULL, strict);
1149
1150                 if (!rt)
1151                         return;
1152
1153                 if (rt->dst.dev) {
1154                         unsigned short dst_len = rt->dst.dev->hard_header_len +
1155                                                  t_hlen;
1156
1157                         if (t->dev->header_ops)
1158                                 dev->hard_header_len = dst_len;
1159                         else
1160                                 dev->needed_headroom = dst_len;
1161
1162                         if (set_mtu) {
1163                                 int mtu = rt->dst.dev->mtu - t_hlen;
1164
1165                                 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1166                                         mtu -= 8;
1167                                 if (dev->type == ARPHRD_ETHER)
1168                                         mtu -= ETH_HLEN;
1169
1170                                 if (mtu < IPV6_MIN_MTU)
1171                                         mtu = IPV6_MIN_MTU;
1172                                 WRITE_ONCE(dev->mtu, mtu);
1173                         }
1174                 }
1175                 ip6_rt_put(rt);
1176         }
1177 }
1178
1179 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1180 {
1181         int t_hlen;
1182
1183         tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1184         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1185
1186         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1187
1188         if (tunnel->dev->header_ops)
1189                 tunnel->dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1190         else
1191                 tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1192
1193         return t_hlen;
1194 }
1195
1196 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1197 {
1198         ip6gre_tnl_link_config_common(t);
1199         ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1200 }
1201
1202 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1203                                      const struct __ip6_tnl_parm *p)
1204 {
1205         t->parms.laddr = p->laddr;
1206         t->parms.raddr = p->raddr;
1207         t->parms.flags = p->flags;
1208         t->parms.hop_limit = p->hop_limit;
1209         t->parms.encap_limit = p->encap_limit;
1210         t->parms.flowinfo = p->flowinfo;
1211         t->parms.link = p->link;
1212         t->parms.proto = p->proto;
1213         t->parms.i_key = p->i_key;
1214         t->parms.o_key = p->o_key;
1215         t->parms.i_flags = p->i_flags;
1216         t->parms.o_flags = p->o_flags;
1217         t->parms.fwmark = p->fwmark;
1218         t->parms.erspan_ver = p->erspan_ver;
1219         t->parms.index = p->index;
1220         t->parms.dir = p->dir;
1221         t->parms.hwid = p->hwid;
1222         dst_cache_reset(&t->dst_cache);
1223 }
1224
1225 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1226                              int set_mtu)
1227 {
1228         ip6gre_tnl_copy_tnl_parm(t, p);
1229         ip6gre_tnl_link_config(t, set_mtu);
1230         return 0;
1231 }
1232
1233 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1234         const struct ip6_tnl_parm2 *u)
1235 {
1236         p->laddr = u->laddr;
1237         p->raddr = u->raddr;
1238         p->flags = u->flags;
1239         p->hop_limit = u->hop_limit;
1240         p->encap_limit = u->encap_limit;
1241         p->flowinfo = u->flowinfo;
1242         p->link = u->link;
1243         p->i_key = u->i_key;
1244         p->o_key = u->o_key;
1245         p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1246         p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1247         memcpy(p->name, u->name, sizeof(u->name));
1248 }
1249
1250 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1251         const struct __ip6_tnl_parm *p)
1252 {
1253         u->proto = IPPROTO_GRE;
1254         u->laddr = p->laddr;
1255         u->raddr = p->raddr;
1256         u->flags = p->flags;
1257         u->hop_limit = p->hop_limit;
1258         u->encap_limit = p->encap_limit;
1259         u->flowinfo = p->flowinfo;
1260         u->link = p->link;
1261         u->i_key = p->i_key;
1262         u->o_key = p->o_key;
1263         u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1264         u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1265         memcpy(u->name, p->name, sizeof(u->name));
1266 }
1267
1268 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1269         struct ifreq *ifr, 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, ifr->ifr_ifru.ifru_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(ifr->ifr_ifru.ifru_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, ifr->ifr_ifru.ifru_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(ifr->ifr_ifru.ifru_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, ifr->ifr_ifru.ifru_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_do_ioctl           = ip6gre_tunnel_ioctl,
1423         .ndo_change_mtu         = ip6_tnl_change_mtu,
1424         .ndo_get_stats64        = ip_tunnel_get_stats64,
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
1462         dev->features           |= GRE6_FEATURES;
1463         dev->hw_features        |= GRE6_FEATURES;
1464
1465         if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1466                 /* TCP offload with GRE SEQ is not supported, nor
1467                  * can we support 2 levels of outer headers requiring
1468                  * an update.
1469                  */
1470                 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1471                     nt->encap.type == TUNNEL_ENCAP_NONE) {
1472                         dev->features    |= NETIF_F_GSO_SOFTWARE;
1473                         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1474                 }
1475
1476                 /* Can use a lockless transmit, unless we generate
1477                  * output sequences
1478                  */
1479                 dev->features |= NETIF_F_LLTX;
1480         }
1481 }
1482
1483 static int ip6gre_tunnel_init_common(struct net_device *dev)
1484 {
1485         struct ip6_tnl *tunnel;
1486         int ret;
1487         int t_hlen;
1488
1489         tunnel = netdev_priv(dev);
1490
1491         tunnel->dev = dev;
1492         tunnel->net = dev_net(dev);
1493         strcpy(tunnel->parms.name, dev->name);
1494
1495         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1496         if (!dev->tstats)
1497                 return -ENOMEM;
1498
1499         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1500         if (ret)
1501                 goto cleanup_alloc_pcpu_stats;
1502
1503         ret = gro_cells_init(&tunnel->gro_cells, dev);
1504         if (ret)
1505                 goto cleanup_dst_cache_init;
1506
1507         t_hlen = ip6gre_calc_hlen(tunnel);
1508         dev->mtu = ETH_DATA_LEN - t_hlen;
1509         if (dev->type == ARPHRD_ETHER)
1510                 dev->mtu -= ETH_HLEN;
1511         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1512                 dev->mtu -= 8;
1513
1514         if (tunnel->parms.collect_md) {
1515                 netif_keep_dst(dev);
1516         }
1517         ip6gre_tnl_init_features(dev);
1518
1519         dev_hold(dev);
1520         return 0;
1521
1522 cleanup_dst_cache_init:
1523         dst_cache_destroy(&tunnel->dst_cache);
1524 cleanup_alloc_pcpu_stats:
1525         free_percpu(dev->tstats);
1526         dev->tstats = NULL;
1527         return ret;
1528 }
1529
1530 static int ip6gre_tunnel_init(struct net_device *dev)
1531 {
1532         struct ip6_tnl *tunnel;
1533         int ret;
1534
1535         ret = ip6gre_tunnel_init_common(dev);
1536         if (ret)
1537                 return ret;
1538
1539         tunnel = netdev_priv(dev);
1540
1541         if (tunnel->parms.collect_md)
1542                 return 0;
1543
1544         memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1545         memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1546
1547         if (ipv6_addr_any(&tunnel->parms.raddr))
1548                 dev->header_ops = &ip6gre_header_ops;
1549
1550         return 0;
1551 }
1552
1553 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1554 {
1555         struct ip6_tnl *tunnel = netdev_priv(dev);
1556
1557         tunnel->dev = dev;
1558         tunnel->net = dev_net(dev);
1559         strcpy(tunnel->parms.name, dev->name);
1560
1561         tunnel->hlen            = sizeof(struct ipv6hdr) + 4;
1562 }
1563
1564 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1565         .handler     = gre_rcv,
1566         .err_handler = ip6gre_err,
1567         .flags       = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1568 };
1569
1570 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1571 {
1572         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1573         struct net_device *dev, *aux;
1574         int prio;
1575
1576         for_each_netdev_safe(net, dev, aux)
1577                 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1578                     dev->rtnl_link_ops == &ip6gre_tap_ops ||
1579                     dev->rtnl_link_ops == &ip6erspan_tap_ops)
1580                         unregister_netdevice_queue(dev, head);
1581
1582         for (prio = 0; prio < 4; prio++) {
1583                 int h;
1584                 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1585                         struct ip6_tnl *t;
1586
1587                         t = rtnl_dereference(ign->tunnels[prio][h]);
1588
1589                         while (t) {
1590                                 /* If dev is in the same netns, it has already
1591                                  * been added to the list by the previous loop.
1592                                  */
1593                                 if (!net_eq(dev_net(t->dev), net))
1594                                         unregister_netdevice_queue(t->dev,
1595                                                                    head);
1596                                 t = rtnl_dereference(t->next);
1597                         }
1598                 }
1599         }
1600 }
1601
1602 static int __net_init ip6gre_init_net(struct net *net)
1603 {
1604         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1605         struct net_device *ndev;
1606         int err;
1607
1608         if (!net_has_fallback_tunnels(net))
1609                 return 0;
1610         ndev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1611                             NET_NAME_UNKNOWN, ip6gre_tunnel_setup);
1612         if (!ndev) {
1613                 err = -ENOMEM;
1614                 goto err_alloc_dev;
1615         }
1616         ign->fb_tunnel_dev = ndev;
1617         dev_net_set(ign->fb_tunnel_dev, net);
1618         /* FB netdevice is special: we have one, and only one per netns.
1619          * Allowing to move it to another netns is clearly unsafe.
1620          */
1621         ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1622
1623
1624         ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1625         ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1626
1627         err = register_netdev(ign->fb_tunnel_dev);
1628         if (err)
1629                 goto err_reg_dev;
1630
1631         rcu_assign_pointer(ign->tunnels_wc[0],
1632                            netdev_priv(ign->fb_tunnel_dev));
1633         return 0;
1634
1635 err_reg_dev:
1636         free_netdev(ndev);
1637 err_alloc_dev:
1638         return err;
1639 }
1640
1641 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1642 {
1643         struct net *net;
1644         LIST_HEAD(list);
1645
1646         rtnl_lock();
1647         list_for_each_entry(net, net_list, exit_list)
1648                 ip6gre_destroy_tunnels(net, &list);
1649         unregister_netdevice_many(&list);
1650         rtnl_unlock();
1651 }
1652
1653 static struct pernet_operations ip6gre_net_ops = {
1654         .init = ip6gre_init_net,
1655         .exit_batch = ip6gre_exit_batch_net,
1656         .id   = &ip6gre_net_id,
1657         .size = sizeof(struct ip6gre_net),
1658 };
1659
1660 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1661                                   struct netlink_ext_ack *extack)
1662 {
1663         __be16 flags;
1664
1665         if (!data)
1666                 return 0;
1667
1668         flags = 0;
1669         if (data[IFLA_GRE_IFLAGS])
1670                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1671         if (data[IFLA_GRE_OFLAGS])
1672                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1673         if (flags & (GRE_VERSION|GRE_ROUTING))
1674                 return -EINVAL;
1675
1676         return 0;
1677 }
1678
1679 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1680                                struct netlink_ext_ack *extack)
1681 {
1682         struct in6_addr daddr;
1683
1684         if (tb[IFLA_ADDRESS]) {
1685                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1686                         return -EINVAL;
1687                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1688                         return -EADDRNOTAVAIL;
1689         }
1690
1691         if (!data)
1692                 goto out;
1693
1694         if (data[IFLA_GRE_REMOTE]) {
1695                 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1696                 if (ipv6_addr_any(&daddr))
1697                         return -EINVAL;
1698         }
1699
1700 out:
1701         return ip6gre_tunnel_validate(tb, data, extack);
1702 }
1703
1704 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1705                                   struct netlink_ext_ack *extack)
1706 {
1707         __be16 flags = 0;
1708         int ret, ver = 0;
1709
1710         if (!data)
1711                 return 0;
1712
1713         ret = ip6gre_tap_validate(tb, data, extack);
1714         if (ret)
1715                 return ret;
1716
1717         /* ERSPAN should only have GRE sequence and key flag */
1718         if (data[IFLA_GRE_OFLAGS])
1719                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1720         if (data[IFLA_GRE_IFLAGS])
1721                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1722         if (!data[IFLA_GRE_COLLECT_METADATA] &&
1723             flags != (GRE_SEQ | GRE_KEY))
1724                 return -EINVAL;
1725
1726         /* ERSPAN Session ID only has 10-bit. Since we reuse
1727          * 32-bit key field as ID, check it's range.
1728          */
1729         if (data[IFLA_GRE_IKEY] &&
1730             (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1731                 return -EINVAL;
1732
1733         if (data[IFLA_GRE_OKEY] &&
1734             (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1735                 return -EINVAL;
1736
1737         if (data[IFLA_GRE_ERSPAN_VER]) {
1738                 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1739                 if (ver != 1 && ver != 2)
1740                         return -EINVAL;
1741         }
1742
1743         if (ver == 1) {
1744                 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1745                         u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1746
1747                         if (index & ~INDEX_MASK)
1748                                 return -EINVAL;
1749                 }
1750         } else if (ver == 2) {
1751                 if (data[IFLA_GRE_ERSPAN_DIR]) {
1752                         u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1753
1754                         if (dir & ~(DIR_MASK >> DIR_OFFSET))
1755                                 return -EINVAL;
1756                 }
1757
1758                 if (data[IFLA_GRE_ERSPAN_HWID]) {
1759                         u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1760
1761                         if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1762                                 return -EINVAL;
1763                 }
1764         }
1765
1766         return 0;
1767 }
1768
1769 static void ip6erspan_set_version(struct nlattr *data[],
1770                                   struct __ip6_tnl_parm *parms)
1771 {
1772         if (!data)
1773                 return;
1774
1775         parms->erspan_ver = 1;
1776         if (data[IFLA_GRE_ERSPAN_VER])
1777                 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1778
1779         if (parms->erspan_ver == 1) {
1780                 if (data[IFLA_GRE_ERSPAN_INDEX])
1781                         parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1782         } else if (parms->erspan_ver == 2) {
1783                 if (data[IFLA_GRE_ERSPAN_DIR])
1784                         parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1785                 if (data[IFLA_GRE_ERSPAN_HWID])
1786                         parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1787         }
1788 }
1789
1790 static void ip6gre_netlink_parms(struct nlattr *data[],
1791                                 struct __ip6_tnl_parm *parms)
1792 {
1793         memset(parms, 0, sizeof(*parms));
1794
1795         if (!data)
1796                 return;
1797
1798         if (data[IFLA_GRE_LINK])
1799                 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1800
1801         if (data[IFLA_GRE_IFLAGS])
1802                 parms->i_flags = gre_flags_to_tnl_flags(
1803                                 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1804
1805         if (data[IFLA_GRE_OFLAGS])
1806                 parms->o_flags = gre_flags_to_tnl_flags(
1807                                 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1808
1809         if (data[IFLA_GRE_IKEY])
1810                 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1811
1812         if (data[IFLA_GRE_OKEY])
1813                 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1814
1815         if (data[IFLA_GRE_LOCAL])
1816                 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1817
1818         if (data[IFLA_GRE_REMOTE])
1819                 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1820
1821         if (data[IFLA_GRE_TTL])
1822                 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1823
1824         if (data[IFLA_GRE_ENCAP_LIMIT])
1825                 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1826
1827         if (data[IFLA_GRE_FLOWINFO])
1828                 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1829
1830         if (data[IFLA_GRE_FLAGS])
1831                 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1832
1833         if (data[IFLA_GRE_FWMARK])
1834                 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1835
1836         if (data[IFLA_GRE_COLLECT_METADATA])
1837                 parms->collect_md = true;
1838 }
1839
1840 static int ip6gre_tap_init(struct net_device *dev)
1841 {
1842         int ret;
1843
1844         ret = ip6gre_tunnel_init_common(dev);
1845         if (ret)
1846                 return ret;
1847
1848         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1849
1850         return 0;
1851 }
1852
1853 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1854         .ndo_init = ip6gre_tap_init,
1855         .ndo_uninit = ip6gre_tunnel_uninit,
1856         .ndo_start_xmit = ip6gre_tunnel_xmit,
1857         .ndo_set_mac_address = eth_mac_addr,
1858         .ndo_validate_addr = eth_validate_addr,
1859         .ndo_change_mtu = ip6_tnl_change_mtu,
1860         .ndo_get_stats64 = ip_tunnel_get_stats64,
1861         .ndo_get_iflink = ip6_tnl_get_iflink,
1862 };
1863
1864 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1865 {
1866         int t_hlen;
1867
1868         tunnel->tun_hlen = 8;
1869         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1870                        erspan_hdr_len(tunnel->parms.erspan_ver);
1871
1872         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1873         tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1874         return t_hlen;
1875 }
1876
1877 static int ip6erspan_tap_init(struct net_device *dev)
1878 {
1879         struct ip6_tnl *tunnel;
1880         int t_hlen;
1881         int ret;
1882
1883         tunnel = netdev_priv(dev);
1884
1885         tunnel->dev = dev;
1886         tunnel->net = dev_net(dev);
1887         strcpy(tunnel->parms.name, dev->name);
1888
1889         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1890         if (!dev->tstats)
1891                 return -ENOMEM;
1892
1893         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1894         if (ret)
1895                 goto cleanup_alloc_pcpu_stats;
1896
1897         ret = gro_cells_init(&tunnel->gro_cells, dev);
1898         if (ret)
1899                 goto cleanup_dst_cache_init;
1900
1901         t_hlen = ip6erspan_calc_hlen(tunnel);
1902         dev->mtu = ETH_DATA_LEN - t_hlen;
1903         if (dev->type == ARPHRD_ETHER)
1904                 dev->mtu -= ETH_HLEN;
1905         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1906                 dev->mtu -= 8;
1907
1908         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1909         ip6erspan_tnl_link_config(tunnel, 1);
1910
1911         dev_hold(dev);
1912         return 0;
1913
1914 cleanup_dst_cache_init:
1915         dst_cache_destroy(&tunnel->dst_cache);
1916 cleanup_alloc_pcpu_stats:
1917         free_percpu(dev->tstats);
1918         dev->tstats = NULL;
1919         return ret;
1920 }
1921
1922 static const struct net_device_ops ip6erspan_netdev_ops = {
1923         .ndo_init =             ip6erspan_tap_init,
1924         .ndo_uninit =           ip6erspan_tunnel_uninit,
1925         .ndo_start_xmit =       ip6erspan_tunnel_xmit,
1926         .ndo_set_mac_address =  eth_mac_addr,
1927         .ndo_validate_addr =    eth_validate_addr,
1928         .ndo_change_mtu =       ip6_tnl_change_mtu,
1929         .ndo_get_stats64 =      ip_tunnel_get_stats64,
1930         .ndo_get_iflink =       ip6_tnl_get_iflink,
1931 };
1932
1933 static void ip6gre_tap_setup(struct net_device *dev)
1934 {
1935
1936         ether_setup(dev);
1937
1938         dev->max_mtu = 0;
1939         dev->netdev_ops = &ip6gre_tap_netdev_ops;
1940         dev->needs_free_netdev = true;
1941         dev->priv_destructor = ip6gre_dev_free;
1942
1943         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1944         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1945         netif_keep_dst(dev);
1946 }
1947
1948 bool is_ip6gretap_dev(const struct net_device *dev)
1949 {
1950         return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1951 }
1952 EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1953
1954 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1955                                        struct ip_tunnel_encap *ipencap)
1956 {
1957         bool ret = false;
1958
1959         memset(ipencap, 0, sizeof(*ipencap));
1960
1961         if (!data)
1962                 return ret;
1963
1964         if (data[IFLA_GRE_ENCAP_TYPE]) {
1965                 ret = true;
1966                 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1967         }
1968
1969         if (data[IFLA_GRE_ENCAP_FLAGS]) {
1970                 ret = true;
1971                 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1972         }
1973
1974         if (data[IFLA_GRE_ENCAP_SPORT]) {
1975                 ret = true;
1976                 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1977         }
1978
1979         if (data[IFLA_GRE_ENCAP_DPORT]) {
1980                 ret = true;
1981                 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1982         }
1983
1984         return ret;
1985 }
1986
1987 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1988                                  struct nlattr *tb[], struct nlattr *data[],
1989                                  struct netlink_ext_ack *extack)
1990 {
1991         struct ip6_tnl *nt;
1992         struct ip_tunnel_encap ipencap;
1993         int err;
1994
1995         nt = netdev_priv(dev);
1996
1997         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1998                 int err = ip6_tnl_encap_setup(nt, &ipencap);
1999
2000                 if (err < 0)
2001                         return err;
2002         }
2003
2004         if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
2005                 eth_hw_addr_random(dev);
2006
2007         nt->dev = dev;
2008         nt->net = dev_net(dev);
2009
2010         err = register_netdevice(dev);
2011         if (err)
2012                 goto out;
2013
2014         if (tb[IFLA_MTU])
2015                 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
2016
2017 out:
2018         return err;
2019 }
2020
2021 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
2022                           struct nlattr *tb[], struct nlattr *data[],
2023                           struct netlink_ext_ack *extack)
2024 {
2025         struct ip6_tnl *nt = netdev_priv(dev);
2026         struct net *net = dev_net(dev);
2027         struct ip6gre_net *ign;
2028         int err;
2029
2030         ip6gre_netlink_parms(data, &nt->parms);
2031         ign = net_generic(net, ip6gre_net_id);
2032
2033         if (nt->parms.collect_md) {
2034                 if (rtnl_dereference(ign->collect_md_tun))
2035                         return -EEXIST;
2036         } else {
2037                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2038                         return -EEXIST;
2039         }
2040
2041         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2042         if (!err) {
2043                 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
2044                 ip6gre_tunnel_link_md(ign, nt);
2045                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2046         }
2047         return err;
2048 }
2049
2050 static struct ip6_tnl *
2051 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2052                          struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2053                          struct netlink_ext_ack *extack)
2054 {
2055         struct ip6_tnl *t, *nt = netdev_priv(dev);
2056         struct net *net = nt->net;
2057         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2058         struct ip_tunnel_encap ipencap;
2059
2060         if (dev == ign->fb_tunnel_dev)
2061                 return ERR_PTR(-EINVAL);
2062
2063         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2064                 int err = ip6_tnl_encap_setup(nt, &ipencap);
2065
2066                 if (err < 0)
2067                         return ERR_PTR(err);
2068         }
2069
2070         ip6gre_netlink_parms(data, p_p);
2071
2072         t = ip6gre_tunnel_locate(net, p_p, 0);
2073
2074         if (t) {
2075                 if (t->dev != dev)
2076                         return ERR_PTR(-EEXIST);
2077         } else {
2078                 t = nt;
2079         }
2080
2081         return t;
2082 }
2083
2084 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2085                              struct nlattr *data[],
2086                              struct netlink_ext_ack *extack)
2087 {
2088         struct ip6_tnl *t = netdev_priv(dev);
2089         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2090         struct __ip6_tnl_parm p;
2091
2092         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2093         if (IS_ERR(t))
2094                 return PTR_ERR(t);
2095
2096         ip6gre_tunnel_unlink_md(ign, t);
2097         ip6gre_tunnel_unlink(ign, t);
2098         ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2099         ip6gre_tunnel_link_md(ign, t);
2100         ip6gre_tunnel_link(ign, t);
2101         return 0;
2102 }
2103
2104 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2105 {
2106         struct net *net = dev_net(dev);
2107         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2108
2109         if (dev != ign->fb_tunnel_dev)
2110                 unregister_netdevice_queue(dev, head);
2111 }
2112
2113 static size_t ip6gre_get_size(const struct net_device *dev)
2114 {
2115         return
2116                 /* IFLA_GRE_LINK */
2117                 nla_total_size(4) +
2118                 /* IFLA_GRE_IFLAGS */
2119                 nla_total_size(2) +
2120                 /* IFLA_GRE_OFLAGS */
2121                 nla_total_size(2) +
2122                 /* IFLA_GRE_IKEY */
2123                 nla_total_size(4) +
2124                 /* IFLA_GRE_OKEY */
2125                 nla_total_size(4) +
2126                 /* IFLA_GRE_LOCAL */
2127                 nla_total_size(sizeof(struct in6_addr)) +
2128                 /* IFLA_GRE_REMOTE */
2129                 nla_total_size(sizeof(struct in6_addr)) +
2130                 /* IFLA_GRE_TTL */
2131                 nla_total_size(1) +
2132                 /* IFLA_GRE_ENCAP_LIMIT */
2133                 nla_total_size(1) +
2134                 /* IFLA_GRE_FLOWINFO */
2135                 nla_total_size(4) +
2136                 /* IFLA_GRE_FLAGS */
2137                 nla_total_size(4) +
2138                 /* IFLA_GRE_ENCAP_TYPE */
2139                 nla_total_size(2) +
2140                 /* IFLA_GRE_ENCAP_FLAGS */
2141                 nla_total_size(2) +
2142                 /* IFLA_GRE_ENCAP_SPORT */
2143                 nla_total_size(2) +
2144                 /* IFLA_GRE_ENCAP_DPORT */
2145                 nla_total_size(2) +
2146                 /* IFLA_GRE_COLLECT_METADATA */
2147                 nla_total_size(0) +
2148                 /* IFLA_GRE_FWMARK */
2149                 nla_total_size(4) +
2150                 /* IFLA_GRE_ERSPAN_INDEX */
2151                 nla_total_size(4) +
2152                 0;
2153 }
2154
2155 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2156 {
2157         struct ip6_tnl *t = netdev_priv(dev);
2158         struct __ip6_tnl_parm *p = &t->parms;
2159         __be16 o_flags = p->o_flags;
2160
2161         if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2162                 if (!p->collect_md)
2163                         o_flags |= TUNNEL_KEY;
2164
2165                 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2166                         goto nla_put_failure;
2167
2168                 if (p->erspan_ver == 1) {
2169                         if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2170                                 goto nla_put_failure;
2171                 } else {
2172                         if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2173                                 goto nla_put_failure;
2174                         if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2175                                 goto nla_put_failure;
2176                 }
2177         }
2178
2179         if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2180             nla_put_be16(skb, IFLA_GRE_IFLAGS,
2181                          gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2182             nla_put_be16(skb, IFLA_GRE_OFLAGS,
2183                          gre_tnl_flags_to_gre_flags(o_flags)) ||
2184             nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2185             nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2186             nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2187             nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2188             nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2189             nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2190             nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2191             nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2192             nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2193                 goto nla_put_failure;
2194
2195         if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2196                         t->encap.type) ||
2197             nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2198                          t->encap.sport) ||
2199             nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2200                          t->encap.dport) ||
2201             nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2202                         t->encap.flags))
2203                 goto nla_put_failure;
2204
2205         if (p->collect_md) {
2206                 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2207                         goto nla_put_failure;
2208         }
2209
2210         return 0;
2211
2212 nla_put_failure:
2213         return -EMSGSIZE;
2214 }
2215
2216 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2217         [IFLA_GRE_LINK]        = { .type = NLA_U32 },
2218         [IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2219         [IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2220         [IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2221         [IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2222         [IFLA_GRE_LOCAL]       = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2223         [IFLA_GRE_REMOTE]      = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2224         [IFLA_GRE_TTL]         = { .type = NLA_U8 },
2225         [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2226         [IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2227         [IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2228         [IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2229         [IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2230         [IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2231         [IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2232         [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2233         [IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2234         [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2235         [IFLA_GRE_ERSPAN_VER]   = { .type = NLA_U8 },
2236         [IFLA_GRE_ERSPAN_DIR]   = { .type = NLA_U8 },
2237         [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
2238 };
2239
2240 static void ip6erspan_tap_setup(struct net_device *dev)
2241 {
2242         ether_setup(dev);
2243
2244         dev->max_mtu = 0;
2245         dev->netdev_ops = &ip6erspan_netdev_ops;
2246         dev->needs_free_netdev = true;
2247         dev->priv_destructor = ip6gre_dev_free;
2248
2249         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2250         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2251         netif_keep_dst(dev);
2252 }
2253
2254 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2255                              struct nlattr *tb[], struct nlattr *data[],
2256                              struct netlink_ext_ack *extack)
2257 {
2258         struct ip6_tnl *nt = netdev_priv(dev);
2259         struct net *net = dev_net(dev);
2260         struct ip6gre_net *ign;
2261         int err;
2262
2263         ip6gre_netlink_parms(data, &nt->parms);
2264         ip6erspan_set_version(data, &nt->parms);
2265         ign = net_generic(net, ip6gre_net_id);
2266
2267         if (nt->parms.collect_md) {
2268                 if (rtnl_dereference(ign->collect_md_tun_erspan))
2269                         return -EEXIST;
2270         } else {
2271                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2272                         return -EEXIST;
2273         }
2274
2275         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2276         if (!err) {
2277                 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2278                 ip6erspan_tunnel_link_md(ign, nt);
2279                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2280         }
2281         return err;
2282 }
2283
2284 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2285 {
2286         ip6gre_tnl_link_config_common(t);
2287         ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2288 }
2289
2290 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2291                                 const struct __ip6_tnl_parm *p, int set_mtu)
2292 {
2293         ip6gre_tnl_copy_tnl_parm(t, p);
2294         ip6erspan_tnl_link_config(t, set_mtu);
2295         return 0;
2296 }
2297
2298 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2299                                 struct nlattr *data[],
2300                                 struct netlink_ext_ack *extack)
2301 {
2302         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2303         struct __ip6_tnl_parm p;
2304         struct ip6_tnl *t;
2305
2306         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2307         if (IS_ERR(t))
2308                 return PTR_ERR(t);
2309
2310         ip6erspan_set_version(data, &p);
2311         ip6gre_tunnel_unlink_md(ign, t);
2312         ip6gre_tunnel_unlink(ign, t);
2313         ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2314         ip6erspan_tunnel_link_md(ign, t);
2315         ip6gre_tunnel_link(ign, t);
2316         return 0;
2317 }
2318
2319 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2320         .kind           = "ip6gre",
2321         .maxtype        = IFLA_GRE_MAX,
2322         .policy         = ip6gre_policy,
2323         .priv_size      = sizeof(struct ip6_tnl),
2324         .setup          = ip6gre_tunnel_setup,
2325         .validate       = ip6gre_tunnel_validate,
2326         .newlink        = ip6gre_newlink,
2327         .changelink     = ip6gre_changelink,
2328         .dellink        = ip6gre_dellink,
2329         .get_size       = ip6gre_get_size,
2330         .fill_info      = ip6gre_fill_info,
2331         .get_link_net   = ip6_tnl_get_link_net,
2332 };
2333
2334 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2335         .kind           = "ip6gretap",
2336         .maxtype        = IFLA_GRE_MAX,
2337         .policy         = ip6gre_policy,
2338         .priv_size      = sizeof(struct ip6_tnl),
2339         .setup          = ip6gre_tap_setup,
2340         .validate       = ip6gre_tap_validate,
2341         .newlink        = ip6gre_newlink,
2342         .changelink     = ip6gre_changelink,
2343         .get_size       = ip6gre_get_size,
2344         .fill_info      = ip6gre_fill_info,
2345         .get_link_net   = ip6_tnl_get_link_net,
2346 };
2347
2348 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2349         .kind           = "ip6erspan",
2350         .maxtype        = IFLA_GRE_MAX,
2351         .policy         = ip6gre_policy,
2352         .priv_size      = sizeof(struct ip6_tnl),
2353         .setup          = ip6erspan_tap_setup,
2354         .validate       = ip6erspan_tap_validate,
2355         .newlink        = ip6erspan_newlink,
2356         .changelink     = ip6erspan_changelink,
2357         .get_size       = ip6gre_get_size,
2358         .fill_info      = ip6gre_fill_info,
2359         .get_link_net   = ip6_tnl_get_link_net,
2360 };
2361
2362 /*
2363  *      And now the modules code and kernel interface.
2364  */
2365
2366 static int __init ip6gre_init(void)
2367 {
2368         int err;
2369
2370         pr_info("GRE over IPv6 tunneling driver\n");
2371
2372         err = register_pernet_device(&ip6gre_net_ops);
2373         if (err < 0)
2374                 return err;
2375
2376         err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2377         if (err < 0) {
2378                 pr_info("%s: can't add protocol\n", __func__);
2379                 goto add_proto_failed;
2380         }
2381
2382         err = rtnl_link_register(&ip6gre_link_ops);
2383         if (err < 0)
2384                 goto rtnl_link_failed;
2385
2386         err = rtnl_link_register(&ip6gre_tap_ops);
2387         if (err < 0)
2388                 goto tap_ops_failed;
2389
2390         err = rtnl_link_register(&ip6erspan_tap_ops);
2391         if (err < 0)
2392                 goto erspan_link_failed;
2393
2394 out:
2395         return err;
2396
2397 erspan_link_failed:
2398         rtnl_link_unregister(&ip6gre_tap_ops);
2399 tap_ops_failed:
2400         rtnl_link_unregister(&ip6gre_link_ops);
2401 rtnl_link_failed:
2402         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2403 add_proto_failed:
2404         unregister_pernet_device(&ip6gre_net_ops);
2405         goto out;
2406 }
2407
2408 static void __exit ip6gre_fini(void)
2409 {
2410         rtnl_link_unregister(&ip6gre_tap_ops);
2411         rtnl_link_unregister(&ip6gre_link_ops);
2412         rtnl_link_unregister(&ip6erspan_tap_ops);
2413         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2414         unregister_pernet_device(&ip6gre_net_ops);
2415 }
2416
2417 module_init(ip6gre_init);
2418 module_exit(ip6gre_fini);
2419 MODULE_LICENSE("GPL");
2420 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2421 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2422 MODULE_ALIAS_RTNL_LINK("ip6gre");
2423 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2424 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2425 MODULE_ALIAS_NETDEV("ip6gre0");