net/ipv6/ip6_gre.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      GRE over IPv6 protocol decoder.
   4  *
   5  *      Authors: Dmitry Kozlov (xeb@mail.ru)
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/capability.h>
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/uaccess.h>
  16 #include <linux/skbuff.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/in.h>
  19 #include <linux/tcp.h>
  20 #include <linux/udp.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/init.h>
  23 #include <linux/in6.h>
  24 #include <linux/inetdevice.h>
  25 #include <linux/igmp.h>
  26 #include <linux/netfilter_ipv4.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/if_ether.h>
  29 #include <linux/hash.h>
  30 #include <linux/if_tunnel.h>
  31 #include <linux/ip6_tunnel.h>
  32
  33 #include <net/sock.h>
  34 #include <net/ip.h>
  35 #include <net/ip_tunnels.h>
  36 #include <net/icmp.h>
  37 #include <net/protocol.h>
  38 #include <net/addrconf.h>
  39 #include <net/arp.h>
  40 #include <net/checksum.h>
  41 #include <net/dsfield.h>
  42 #include <net/inet_ecn.h>
  43 #include <net/xfrm.h>
  44 #include <net/net_namespace.h>
  45 #include <net/netns/generic.h>
  46 #include <net/rtnetlink.h>
  47
  48 #include <net/ipv6.h>
  49 #include <net/ip6_fib.h>
  50 #include <net/ip6_route.h>
  51 #include <net/ip6_tunnel.h>
  52 #include <net/gre.h>
  53 #include <net/erspan.h>
  54 #include <net/dst_metadata.h>
  55
  56
  57 static bool log_ecn_error = true;
  58 module_param(log_ecn_error, bool, 0644);
  59 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
  60
  61 #define IP6_GRE_HASH_SIZE_SHIFT  5
  62 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
  63
  64 static unsigned int ip6gre_net_id __read_mostly;
  65 struct ip6gre_net {
  66         struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
  67
  68         struct ip6_tnl __rcu *collect_md_tun;
  69         struct ip6_tnl __rcu *collect_md_tun_erspan;
  70         struct net_device *fb_tunnel_dev;
  71 };
  72
  73 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
  74 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
  75 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
  76 static int ip6gre_tunnel_init(struct net_device *dev);
  77 static void ip6gre_tunnel_setup(struct net_device *dev);
  78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
  79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  80 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  81
  82 /* Tunnel hash table */
  83
  84 /*
  85    4 hash tables:
  86
  87    3: (remote,local)
  88    2: (remote,*)
  89    1: (*,local)
  90    0: (*,*)
  91
  92    We require exact key match i.e. if a key is present in packet
  93    it will match only tunnel with the same key; if it is not present,
  94    it will match only keyless tunnel.
  95
  96    All keysless packets, if not matched configured keyless tunnels
  97    will match fallback tunnel.
  98  */
  99
 100 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
 101 static u32 HASH_ADDR(const struct in6_addr *addr)
 102 {
 103         u32 hash = ipv6_addr_hash(addr);
 104
 105         return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
 106 }
 107
 108 #define tunnels_r_l     tunnels[3]
 109 #define tunnels_r       tunnels[2]
 110 #define tunnels_l       tunnels[1]
 111 #define tunnels_wc      tunnels[0]
 112
 113 /* Given src, dst and key, find appropriate for input tunnel. */
 114
 115 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
 116                 const struct in6_addr *remote, const struct in6_addr *local,
 117                 __be32 key, __be16 gre_proto)
 118 {
 119         struct net *net = dev_net(dev);
 120         int link = dev->ifindex;
 121         unsigned int h0 = HASH_ADDR(remote);
 122         unsigned int h1 = HASH_KEY(key);
 123         struct ip6_tnl *t, *cand = NULL;
 124         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 125         int dev_type = (gre_proto == htons(ETH_P_TEB) ||
 126                         gre_proto == htons(ETH_P_ERSPAN) ||
 127                         gre_proto == htons(ETH_P_ERSPAN2)) ?
 128                        ARPHRD_ETHER : ARPHRD_IP6GRE;
 129         int score, cand_score = 4;
 130
 131         for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
 132                 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
 133                     !ipv6_addr_equal(remote, &t->parms.raddr) ||
 134                     key != t->parms.i_key ||
 135                     !(t->dev->flags & IFF_UP))
 136                         continue;
 137
 138                 if (t->dev->type != ARPHRD_IP6GRE &&
 139                     t->dev->type != dev_type)
 140                         continue;
 141
 142                 score = 0;
 143                 if (t->parms.link != link)
 144                         score |= 1;
 145                 if (t->dev->type != dev_type)
 146                         score |= 2;
 147                 if (score == 0)
 148                         return t;
 149
 150                 if (score < cand_score) {
 151                         cand = t;
 152                         cand_score = score;
 153                 }
 154         }
 155
 156         for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
 157                 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
 158                     key != t->parms.i_key ||
 159                     !(t->dev->flags & IFF_UP))
 160                         continue;
 161
 162                 if (t->dev->type != ARPHRD_IP6GRE &&
 163                     t->dev->type != dev_type)
 164                         continue;
 165
 166                 score = 0;
 167                 if (t->parms.link != link)
 168                         score |= 1;
 169                 if (t->dev->type != dev_type)
 170                         score |= 2;
 171                 if (score == 0)
 172                         return t;
 173
 174                 if (score < cand_score) {
 175                         cand = t;
 176                         cand_score = score;
 177                 }
 178         }
 179
 180         for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
 181                 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
 182                           (!ipv6_addr_equal(local, &t->parms.raddr) ||
 183                                  !ipv6_addr_is_multicast(local))) ||
 184                     key != t->parms.i_key ||
 185                     !(t->dev->flags & IFF_UP))
 186                         continue;
 187
 188                 if (t->dev->type != ARPHRD_IP6GRE &&
 189                     t->dev->type != dev_type)
 190                         continue;
 191
 192                 score = 0;
 193                 if (t->parms.link != link)
 194                         score |= 1;
 195                 if (t->dev->type != dev_type)
 196                         score |= 2;
 197                 if (score == 0)
 198                         return t;
 199
 200                 if (score < cand_score) {
 201                         cand = t;
 202                         cand_score = score;
 203                 }
 204         }
 205
 206         for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
 207                 if (t->parms.i_key != key ||
 208                     !(t->dev->flags & IFF_UP))
 209                         continue;
 210
 211                 if (t->dev->type != ARPHRD_IP6GRE &&
 212                     t->dev->type != dev_type)
 213                         continue;
 214
 215                 score = 0;
 216                 if (t->parms.link != link)
 217                         score |= 1;
 218                 if (t->dev->type != dev_type)
 219                         score |= 2;
 220                 if (score == 0)
 221                         return t;
 222
 223                 if (score < cand_score) {
 224                         cand = t;
 225                         cand_score = score;
 226                 }
 227         }
 228
 229         if (cand)
 230                 return cand;
 231
 232         if (gre_proto == htons(ETH_P_ERSPAN) ||
 233             gre_proto == htons(ETH_P_ERSPAN2))
 234                 t = rcu_dereference(ign->collect_md_tun_erspan);
 235         else
 236                 t = rcu_dereference(ign->collect_md_tun);
 237
 238         if (t && t->dev->flags & IFF_UP)
 239                 return t;
 240
 241         dev = ign->fb_tunnel_dev;
 242         if (dev && dev->flags & IFF_UP)
 243                 return netdev_priv(dev);
 244
 245         return NULL;
 246 }
 247
 248 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
 249                 const struct __ip6_tnl_parm *p)
 250 {
 251         const struct in6_addr *remote = &p->raddr;
 252         const struct in6_addr *local = &p->laddr;
 253         unsigned int h = HASH_KEY(p->i_key);
 254         int prio = 0;
 255
 256         if (!ipv6_addr_any(local))
 257                 prio |= 1;
 258         if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
 259                 prio |= 2;
 260                 h ^= HASH_ADDR(remote);
 261         }
 262
 263         return &ign->tunnels[prio][h];
 264 }
 265
 266 static void ip6gre_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 267 {
 268         if (t->parms.collect_md)
 269                 rcu_assign_pointer(ign->collect_md_tun, t);
 270 }
 271
 272 static void ip6erspan_tunnel_link_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 273 {
 274         if (t->parms.collect_md)
 275                 rcu_assign_pointer(ign->collect_md_tun_erspan, t);
 276 }
 277
 278 static void ip6gre_tunnel_unlink_md(struct ip6gre_net *ign, struct ip6_tnl *t)
 279 {
 280         if (t->parms.collect_md)
 281                 rcu_assign_pointer(ign->collect_md_tun, NULL);
 282 }
 283
 284 static void ip6erspan_tunnel_unlink_md(struct ip6gre_net *ign,
 285                                        struct ip6_tnl *t)
 286 {
 287         if (t->parms.collect_md)
 288                 rcu_assign_pointer(ign->collect_md_tun_erspan, NULL);
 289 }
 290
 291 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
 292                 const struct ip6_tnl *t)
 293 {
 294         return __ip6gre_bucket(ign, &t->parms);
 295 }
 296
 297 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
 298 {
 299         struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
 300
 301         rcu_assign_pointer(t->next, rtnl_dereference(*tp));
 302         rcu_assign_pointer(*tp, t);
 303 }
 304
 305 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
 306 {
 307         struct ip6_tnl __rcu **tp;
 308         struct ip6_tnl *iter;
 309
 310         for (tp = ip6gre_bucket(ign, t);
 311              (iter = rtnl_dereference(*tp)) != NULL;
 312              tp = &iter->next) {
 313                 if (t == iter) {
 314                         rcu_assign_pointer(*tp, t->next);
 315                         break;
 316                 }
 317         }
 318 }
 319
 320 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
 321                                            const struct __ip6_tnl_parm *parms,
 322                                            int type)
 323 {
 324         const struct in6_addr *remote = &parms->raddr;
 325         const struct in6_addr *local = &parms->laddr;
 326         __be32 key = parms->i_key;
 327         int link = parms->link;
 328         struct ip6_tnl *t;
 329         struct ip6_tnl __rcu **tp;
 330         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 331
 332         for (tp = __ip6gre_bucket(ign, parms);
 333              (t = rtnl_dereference(*tp)) != NULL;
 334              tp = &t->next)
 335                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
 336                     ipv6_addr_equal(remote, &t->parms.raddr) &&
 337                     key == t->parms.i_key &&
 338                     link == t->parms.link &&
 339                     type == t->dev->type)
 340                         break;
 341
 342         return t;
 343 }
 344
 345 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
 346                 const struct __ip6_tnl_parm *parms, int create)
 347 {
 348         struct ip6_tnl *t, *nt;
 349         struct net_device *dev;
 350         char name[IFNAMSIZ];
 351         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 352
 353         t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
 354         if (t && create)
 355                 return NULL;
 356         if (t || !create)
 357                 return t;
 358
 359         if (parms->name[0]) {
 360                 if (!dev_valid_name(parms->name))
 361                         return NULL;
 362                 strlcpy(name, parms->name, IFNAMSIZ);
 363         } else {
 364                 strcpy(name, "ip6gre%d");
 365         }
 366         dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
 367                            ip6gre_tunnel_setup);
 368         if (!dev)
 369                 return NULL;
 370
 371         dev_net_set(dev, net);
 372
 373         nt = netdev_priv(dev);
 374         nt->parms = *parms;
 375         dev->rtnl_link_ops = &ip6gre_link_ops;
 376
 377         nt->dev = dev;
 378         nt->net = dev_net(dev);
 379
 380         if (register_netdevice(dev) < 0)
 381                 goto failed_free;
 382
 383         ip6gre_tnl_link_config(nt, 1);
 384
 385         /* Can use a lockless transmit, unless we generate output sequences */
 386         if (!(nt->parms.o_flags & TUNNEL_SEQ))
 387                 dev->features |= NETIF_F_LLTX;
 388
 389         dev_hold(dev);
 390         ip6gre_tunnel_link(ign, nt);
 391         return nt;
 392
 393 failed_free:
 394         free_netdev(dev);
 395         return NULL;
 396 }
 397
 398 static void ip6erspan_tunnel_uninit(struct net_device *dev)
 399 {
 400         struct ip6_tnl *t = netdev_priv(dev);
 401         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 402
 403         ip6erspan_tunnel_unlink_md(ign, t);
 404         ip6gre_tunnel_unlink(ign, t);
 405         dst_cache_reset(&t->dst_cache);
 406         dev_put(dev);
 407 }
 408
 409 static void ip6gre_tunnel_uninit(struct net_device *dev)
 410 {
 411         struct ip6_tnl *t = netdev_priv(dev);
 412         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 413
 414         ip6gre_tunnel_unlink_md(ign, t);
 415         ip6gre_tunnel_unlink(ign, t);
 416         dst_cache_reset(&t->dst_cache);
 417         dev_put(dev);
 418 }
 419
 420
 421 static int ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 422                        u8 type, u8 code, int offset, __be32 info)
 423 {
 424         struct net *net = dev_net(skb->dev);
 425         const struct ipv6hdr *ipv6h;
 426         struct tnl_ptk_info tpi;
 427         struct ip6_tnl *t;
 428
 429         if (gre_parse_header(skb, &tpi, NULL, htons(ETH_P_IPV6),
 430                              offset) < 0)
 431                 return -EINVAL;
 432
 433         ipv6h = (const struct ipv6hdr *)skb->data;
 434         t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
 435                                  tpi.key, tpi.proto);
 436         if (!t)
 437                 return -ENOENT;
 438
 439         switch (type) {
 440                 struct ipv6_tlv_tnl_enc_lim *tel;
 441                 __u32 teli;
 442         case ICMPV6_DEST_UNREACH:
 443                 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
 444                                     t->parms.name);
 445                 if (code != ICMPV6_PORT_UNREACH)
 446                         break;
 447                 return 0;
 448         case ICMPV6_TIME_EXCEED:
 449                 if (code == ICMPV6_EXC_HOPLIMIT) {
 450                         net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
 451                                             t->parms.name);
 452                         break;
 453                 }
 454                 return 0;
 455         case ICMPV6_PARAMPROB:
 456                 teli = 0;
 457                 if (code == ICMPV6_HDR_FIELD)
 458                         teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
 459
 460                 if (teli && teli == be32_to_cpu(info) - 2) {
 461                         tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
 462                         if (tel->encap_limit == 0) {
 463                                 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
 464                                                     t->parms.name);
 465                         }
 466                 } else {
 467                         net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
 468                                             t->parms.name);
 469                 }
 470                 return 0;
 471         case ICMPV6_PKT_TOOBIG:
 472                 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
 473                 return 0;
 474         case NDISC_REDIRECT:
 475                 ip6_redirect(skb, net, skb->dev->ifindex, 0,
 476                              sock_net_uid(net, NULL));
 477                 return 0;
 478         }
 479
 480         if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
 481                 t->err_count++;
 482         else
 483                 t->err_count = 1;
 484         t->err_time = jiffies;
 485
 486         return 0;
 487 }
 488
 489 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
 490 {
 491         const struct ipv6hdr *ipv6h;
 492         struct ip6_tnl *tunnel;
 493
 494         ipv6h = ipv6_hdr(skb);
 495         tunnel = ip6gre_tunnel_lookup(skb->dev,
 496                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 497                                       tpi->proto);
 498         if (tunnel) {
 499                 if (tunnel->parms.collect_md) {
 500                         struct metadata_dst *tun_dst;
 501                         __be64 tun_id;
 502                         __be16 flags;
 503
 504                         flags = tpi->flags;
 505                         tun_id = key32_to_tunnel_id(tpi->key);
 506
 507                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
 508                         if (!tun_dst)
 509                                 return PACKET_REJECT;
 510
 511                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 512                 } else {
 513                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 514                 }
 515
 516                 return PACKET_RCVD;
 517         }
 518
 519         return PACKET_REJECT;
 520 }
 521
 522 static int ip6erspan_rcv(struct sk_buff *skb,
 523                          struct tnl_ptk_info *tpi,
 524                          int gre_hdr_len)
 525 {
 526         struct erspan_base_hdr *ershdr;
 527         const struct ipv6hdr *ipv6h;
 528         struct erspan_md2 *md2;
 529         struct ip6_tnl *tunnel;
 530         u8 ver;
 531
 532         ipv6h = ipv6_hdr(skb);
 533         ershdr = (struct erspan_base_hdr *)skb->data;
 534         ver = ershdr->ver;
 535
 536         tunnel = ip6gre_tunnel_lookup(skb->dev,
 537                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 538                                       tpi->proto);
 539         if (tunnel) {
 540                 int len = erspan_hdr_len(ver);
 541
 542                 if (unlikely(!pskb_may_pull(skb, len)))
 543                         return PACKET_REJECT;
 544
 545                 if (__iptunnel_pull_header(skb, len,
 546                                            htons(ETH_P_TEB),
 547                                            false, false) < 0)
 548                         return PACKET_REJECT;
 549
 550                 if (tunnel->parms.collect_md) {
 551                         struct erspan_metadata *pkt_md, *md;
 552                         struct metadata_dst *tun_dst;
 553                         struct ip_tunnel_info *info;
 554                         unsigned char *gh;
 555                         __be64 tun_id;
 556                         __be16 flags;
 557
 558                         tpi->flags |= TUNNEL_KEY;
 559                         flags = tpi->flags;
 560                         tun_id = key32_to_tunnel_id(tpi->key);
 561
 562                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
 563                                                   sizeof(*md));
 564                         if (!tun_dst)
 565                                 return PACKET_REJECT;
 566
 567                         /* skb can be uncloned in __iptunnel_pull_header, so
 568                          * old pkt_md is no longer valid and we need to reset
 569                          * it
 570                          */
 571                         gh = skb_network_header(skb) +
 572                              skb_network_header_len(skb);
 573                         pkt_md = (struct erspan_metadata *)(gh + gre_hdr_len +
 574                                                             sizeof(*ershdr));
 575                         info = &tun_dst->u.tun_info;
 576                         md = ip_tunnel_info_opts(info);
 577                         md->version = ver;
 578                         md2 = &md->u.md2;
 579                         memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
 580                                                        ERSPAN_V2_MDSIZE);
 581                         info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
 582                         info->options_len = sizeof(*md);
 583
 584                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 585
 586                 } else {
 587                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 588                 }
 589
 590                 return PACKET_RCVD;
 591         }
 592
 593         return PACKET_REJECT;
 594 }
 595
 596 static int gre_rcv(struct sk_buff *skb)
 597 {
 598         struct tnl_ptk_info tpi;
 599         bool csum_err = false;
 600         int hdr_len;
 601
 602         hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
 603         if (hdr_len < 0)
 604                 goto drop;
 605
 606         if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 607                 goto drop;
 608
 609         if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
 610                      tpi.proto == htons(ETH_P_ERSPAN2))) {
 611                 if (ip6erspan_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
 612                         return 0;
 613                 goto out;
 614         }
 615
 616         if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 617                 return 0;
 618
 619 out:
 620         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 621 drop:
 622         kfree_skb(skb);
 623         return 0;
 624 }
 625
 626 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 627 {
 628         return iptunnel_handle_offloads(skb,
 629                                         csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 630 }
 631
 632 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
 633                                      struct net_device *dev,
 634                                      struct flowi6 *fl6, __u8 *dsfield,
 635                                      int *encap_limit)
 636 {
 637         const struct iphdr *iph = ip_hdr(skb);
 638         struct ip6_tnl *t = netdev_priv(dev);
 639
 640         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 641                 *encap_limit = t->parms.encap_limit;
 642
 643         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 644
 645         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 646                 *dsfield = ipv4_get_dsfield(iph);
 647         else
 648                 *dsfield = ip6_tclass(t->parms.flowinfo);
 649
 650         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 651                 fl6->flowi6_mark = skb->mark;
 652         else
 653                 fl6->flowi6_mark = t->parms.fwmark;
 654
 655         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 656 }
 657
 658 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
 659                                     struct net_device *dev,
 660                                     struct flowi6 *fl6, __u8 *dsfield,
 661                                     int *encap_limit)
 662 {
 663         struct ipv6hdr *ipv6h;
 664         struct ip6_tnl *t = netdev_priv(dev);
 665         __u16 offset;
 666
 667         offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
 668         /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
 669         ipv6h = ipv6_hdr(skb);
 670
 671         if (offset > 0) {
 672                 struct ipv6_tlv_tnl_enc_lim *tel;
 673
 674                 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
 675                 if (tel->encap_limit == 0) {
 676                         icmpv6_send(skb, ICMPV6_PARAMPROB,
 677                                     ICMPV6_HDR_FIELD, offset + 2);
 678                         return -1;
 679                 }
 680                 *encap_limit = tel->encap_limit - 1;
 681         } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
 682                 *encap_limit = t->parms.encap_limit;
 683         }
 684
 685         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 686
 687         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 688                 *dsfield = ipv6_get_dsfield(ipv6h);
 689         else
 690                 *dsfield = ip6_tclass(t->parms.flowinfo);
 691
 692         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 693                 fl6->flowlabel |= ip6_flowlabel(ipv6h);
 694
 695         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 696                 fl6->flowi6_mark = skb->mark;
 697         else
 698                 fl6->flowi6_mark = t->parms.fwmark;
 699
 700         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 701
 702         return 0;
 703 }
 704
 705 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
 706                                struct net_device *dev, __u8 dsfield,
 707                                struct flowi6 *fl6, int encap_limit,
 708                                __u32 *pmtu, __be16 proto)
 709 {
 710         struct ip6_tnl *tunnel = netdev_priv(dev);
 711         __be16 protocol;
 712
 713         if (dev->type == ARPHRD_ETHER)
 714                 IPCB(skb)->flags = 0;
 715
 716         if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
 717                 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
 718         else
 719                 fl6->daddr = tunnel->parms.raddr;
 720
 721         if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
 722                 return -ENOMEM;
 723
 724         /* Push GRE header. */
 725         protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
 726
 727         if (tunnel->parms.collect_md) {
 728                 struct ip_tunnel_info *tun_info;
 729                 const struct ip_tunnel_key *key;
 730                 __be16 flags;
 731
 732                 tun_info = skb_tunnel_info(skb);
 733                 if (unlikely(!tun_info ||
 734                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
 735                              ip_tunnel_info_af(tun_info) != AF_INET6))
 736                         return -EINVAL;
 737
 738                 key = &tun_info->key;
 739                 memset(fl6, 0, sizeof(*fl6));
 740                 fl6->flowi6_proto = IPPROTO_GRE;
 741                 fl6->daddr = key->u.ipv6.dst;
 742                 fl6->flowlabel = key->label;
 743                 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 744
 745                 dsfield = key->tos;
 746                 flags = key->tun_flags &
 747                         (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
 748                 tunnel->tun_hlen = gre_calc_hlen(flags);
 749
 750                 gre_build_header(skb, tunnel->tun_hlen,
 751                                  flags, protocol,
 752                                  tunnel_id_to_key32(tun_info->key.tun_id),
 753                                  (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
 754                                                       : 0);
 755
 756         } else {
 757                 if (tunnel->parms.o_flags & TUNNEL_SEQ)
 758                         tunnel->o_seqno++;
 759
 760                 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
 761                                  protocol, tunnel->parms.o_key,
 762                                  htonl(tunnel->o_seqno));
 763         }
 764
 765         return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
 766                             NEXTHDR_GRE);
 767 }
 768
 769 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
 770 {
 771         struct ip6_tnl *t = netdev_priv(dev);
 772         int encap_limit = -1;
 773         struct flowi6 fl6;
 774         __u8 dsfield = 0;
 775         __u32 mtu;
 776         int err;
 777
 778         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 779
 780         if (!t->parms.collect_md)
 781                 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
 782                                          &dsfield, &encap_limit);
 783
 784         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 785         if (err)
 786                 return -1;
 787
 788         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
 789                           skb->protocol);
 790         if (err != 0) {
 791                 /* XXX: send ICMP error even if DF is not set. */
 792                 if (err == -EMSGSIZE)
 793                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 794                                   htonl(mtu));
 795                 return -1;
 796         }
 797
 798         return 0;
 799 }
 800
 801 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
 802 {
 803         struct ip6_tnl *t = netdev_priv(dev);
 804         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 805         int encap_limit = -1;
 806         struct flowi6 fl6;
 807         __u8 dsfield = 0;
 808         __u32 mtu;
 809         int err;
 810
 811         if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
 812                 return -1;
 813
 814         if (!t->parms.collect_md &&
 815             prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
 816                 return -1;
 817
 818         if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
 819                 return -1;
 820
 821         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
 822                           &mtu, skb->protocol);
 823         if (err != 0) {
 824                 if (err == -EMSGSIZE)
 825                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 826                 return -1;
 827         }
 828
 829         return 0;
 830 }
 831
 832 /**
 833  * ip6gre_tnl_addr_conflict - compare packet addresses to tunnel's own
 834  *   @t: the outgoing tunnel device
 835  *   @hdr: IPv6 header from the incoming packet
 836  *
 837  * Description:
 838  *   Avoid trivial tunneling loop by checking that tunnel exit-point
 839  *   doesn't match source of incoming packet.
 840  *
 841  * Return:
 842  *   1 if conflict,
 843  *   0 else
 844  **/
 845
 846 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
 847         const struct ipv6hdr *hdr)
 848 {
 849         return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
 850 }
 851
 852 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
 853 {
 854         struct ip6_tnl *t = netdev_priv(dev);
 855         int encap_limit = -1;
 856         struct flowi6 fl6;
 857         __u32 mtu;
 858         int err;
 859
 860         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 861                 encap_limit = t->parms.encap_limit;
 862
 863         if (!t->parms.collect_md)
 864                 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
 865
 866         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 867         if (err)
 868                 return err;
 869
 870         err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
 871
 872         return err;
 873 }
 874
 875 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
 876         struct net_device *dev)
 877 {
 878         struct ip6_tnl *t = netdev_priv(dev);
 879         struct net_device_stats *stats = &t->dev->stats;
 880         int ret;
 881
 882         if (!pskb_inet_may_pull(skb))
 883                 goto tx_err;
 884
 885         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 886                 goto tx_err;
 887
 888         switch (skb->protocol) {
 889         case htons(ETH_P_IP):
 890                 ret = ip6gre_xmit_ipv4(skb, dev);
 891                 break;
 892         case htons(ETH_P_IPV6):
 893                 ret = ip6gre_xmit_ipv6(skb, dev);
 894                 break;
 895         default:
 896                 ret = ip6gre_xmit_other(skb, dev);
 897                 break;
 898         }
 899
 900         if (ret < 0)
 901                 goto tx_err;
 902
 903         return NETDEV_TX_OK;
 904
 905 tx_err:
 906         stats->tx_errors++;
 907         stats->tx_dropped++;
 908         kfree_skb(skb);
 909         return NETDEV_TX_OK;
 910 }
 911
 912 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 913                                          struct net_device *dev)
 914 {
 915         struct ip6_tnl *t = netdev_priv(dev);
 916         struct dst_entry *dst = skb_dst(skb);
 917         struct net_device_stats *stats;
 918         bool truncate = false;
 919         int encap_limit = -1;
 920         __u8 dsfield = false;
 921         struct flowi6 fl6;
 922         int err = -EINVAL;
 923         __be16 proto;
 924         __u32 mtu;
 925         int nhoff;
 926         int thoff;
 927
 928         if (!pskb_inet_may_pull(skb))
 929                 goto tx_err;
 930
 931         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 932                 goto tx_err;
 933
 934         if (gre_handle_offloads(skb, false))
 935                 goto tx_err;
 936
 937         if (skb->len > dev->mtu + dev->hard_header_len) {
 938                 pskb_trim(skb, dev->mtu + dev->hard_header_len);
 939                 truncate = true;
 940         }
 941
 942         nhoff = skb_network_header(skb) - skb_mac_header(skb);
 943         if (skb->protocol == htons(ETH_P_IP) &&
 944             (ntohs(ip_hdr(skb)->tot_len) > skb->len - nhoff))
 945                 truncate = true;
 946
 947         thoff = skb_transport_header(skb) - skb_mac_header(skb);
 948         if (skb->protocol == htons(ETH_P_IPV6) &&
 949             (ntohs(ipv6_hdr(skb)->payload_len) > skb->len - thoff))
 950                 truncate = true;
 951
 952         if (skb_cow_head(skb, dev->needed_headroom ?: t->hlen))
 953                 goto tx_err;
 954
 955         t->parms.o_flags &= ~TUNNEL_KEY;
 956         IPCB(skb)->flags = 0;
 957
 958         /* For collect_md mode, derive fl6 from the tunnel key,
 959          * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
 960          */
 961         if (t->parms.collect_md) {
 962                 struct ip_tunnel_info *tun_info;
 963                 const struct ip_tunnel_key *key;
 964                 struct erspan_metadata *md;
 965                 __be32 tun_id;
 966
 967                 tun_info = skb_tunnel_info(skb);
 968                 if (unlikely(!tun_info ||
 969                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
 970                              ip_tunnel_info_af(tun_info) != AF_INET6))
 971                         goto tx_err;
 972
 973                 key = &tun_info->key;
 974                 memset(&fl6, 0, sizeof(fl6));
 975                 fl6.flowi6_proto = IPPROTO_GRE;
 976                 fl6.daddr = key->u.ipv6.dst;
 977                 fl6.flowlabel = key->label;
 978                 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 979
 980                 dsfield = key->tos;
 981                 if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
 982                         goto tx_err;
 983                 md = ip_tunnel_info_opts(tun_info);
 984                 if (!md)
 985                         goto tx_err;
 986
 987                 tun_id = tunnel_id_to_key32(key->tun_id);
 988                 if (md->version == 1) {
 989                         erspan_build_header(skb,
 990                                             ntohl(tun_id),
 991                                             ntohl(md->u.index), truncate,
 992                                             false);
 993                 } else if (md->version == 2) {
 994                         erspan_build_header_v2(skb,
 995                                                ntohl(tun_id),
 996                                                md->u.md2.dir,
 997                                                get_hwid(&md->u.md2),
 998                                                truncate, false);
 999                 } else {
1000                         goto tx_err;
1001                 }
1002         } else {
1003                 switch (skb->protocol) {
1004                 case htons(ETH_P_IP):
1005                         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
1006                         prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
1007                                                  &dsfield, &encap_limit);
1008                         break;
1009                 case htons(ETH_P_IPV6):
1010                         if (ipv6_addr_equal(&t->parms.raddr, &ipv6_hdr(skb)->saddr))
1011                                 goto tx_err;
1012                         if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
1013                                                      &dsfield, &encap_limit))
1014                                 goto tx_err;
1015                         break;
1016                 default:
1017                         memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
1018                         break;
1019                 }
1020
1021                 if (t->parms.erspan_ver == 1)
1022                         erspan_build_header(skb, ntohl(t->parms.o_key),
1023                                             t->parms.index,
1024                                             truncate, false);
1025                 else if (t->parms.erspan_ver == 2)
1026                         erspan_build_header_v2(skb, ntohl(t->parms.o_key),
1027                                                t->parms.dir,
1028                                                t->parms.hwid,
1029                                                truncate, false);
1030                 else
1031                         goto tx_err;
1032
1033                 fl6.daddr = t->parms.raddr;
1034         }
1035
1036         /* Push GRE header. */
1037         proto = (t->parms.erspan_ver == 1) ? htons(ETH_P_ERSPAN)
1038                                            : htons(ETH_P_ERSPAN2);
1039         gre_build_header(skb, 8, TUNNEL_SEQ, proto, 0, htonl(t->o_seqno++));
1040
1041         /* TooBig packet may have updated dst->dev's mtu */
1042         if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
1043                 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
1044
1045         err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
1046                            NEXTHDR_GRE);
1047         if (err != 0) {
1048                 /* XXX: send ICMP error even if DF is not set. */
1049                 if (err == -EMSGSIZE) {
1050                         if (skb->protocol == htons(ETH_P_IP))
1051                                 icmp_send(skb, ICMP_DEST_UNREACH,
1052                                           ICMP_FRAG_NEEDED, htonl(mtu));
1053                         else
1054                                 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1055                 }
1056
1057                 goto tx_err;
1058         }
1059         return NETDEV_TX_OK;
1060
1061 tx_err:
1062         stats = &t->dev->stats;
1063         stats->tx_errors++;
1064         stats->tx_dropped++;
1065         kfree_skb(skb);
1066         return NETDEV_TX_OK;
1067 }
1068
1069 static void ip6gre_tnl_link_config_common(struct ip6_tnl *t)
1070 {
1071         struct net_device *dev = t->dev;
1072         struct __ip6_tnl_parm *p = &t->parms;
1073         struct flowi6 *fl6 = &t->fl.u.ip6;
1074
1075         if (dev->type != ARPHRD_ETHER) {
1076                 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1077                 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1078         }
1079
1080         /* Set up flowi template */
1081         fl6->saddr = p->laddr;
1082         fl6->daddr = p->raddr;
1083         fl6->flowi6_oif = p->link;
1084         fl6->flowlabel = 0;
1085         fl6->flowi6_proto = IPPROTO_GRE;
1086
1087         if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1088                 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1089         if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1090                 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1091
1092         p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1093         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1094
1095         if (p->flags&IP6_TNL_F_CAP_XMIT &&
1096                         p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1097                 dev->flags |= IFF_POINTOPOINT;
1098         else
1099                 dev->flags &= ~IFF_POINTOPOINT;
1100 }
1101
1102 static void ip6gre_tnl_link_config_route(struct ip6_tnl *t, int set_mtu,
1103                                          int t_hlen)
1104 {
1105         const struct __ip6_tnl_parm *p = &t->parms;
1106         struct net_device *dev = t->dev;
1107
1108         if (p->flags & IP6_TNL_F_CAP_XMIT) {
1109                 int strict = (ipv6_addr_type(&p->raddr) &
1110                               (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1111
1112                 struct rt6_info *rt = rt6_lookup(t->net,
1113                                                  &p->raddr, &p->laddr,
1114                                                  p->link, NULL, strict);
1115
1116                 if (!rt)
1117                         return;
1118
1119                 if (rt->dst.dev) {
1120                         dev->needed_headroom = rt->dst.dev->hard_header_len +
1121                                                t_hlen;
1122
1123                         if (set_mtu) {
1124                                 dev->mtu = rt->dst.dev->mtu - t_hlen;
1125                                 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1126                                         dev->mtu -= 8;
1127                                 if (dev->type == ARPHRD_ETHER)
1128                                         dev->mtu -= ETH_HLEN;
1129
1130                                 if (dev->mtu < IPV6_MIN_MTU)
1131                                         dev->mtu = IPV6_MIN_MTU;
1132                         }
1133                 }
1134                 ip6_rt_put(rt);
1135         }
1136 }
1137
1138 static int ip6gre_calc_hlen(struct ip6_tnl *tunnel)
1139 {
1140         int t_hlen;
1141
1142         tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1143         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1144
1145         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1146         tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1147         return t_hlen;
1148 }
1149
1150 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1151 {
1152         ip6gre_tnl_link_config_common(t);
1153         ip6gre_tnl_link_config_route(t, set_mtu, ip6gre_calc_hlen(t));
1154 }
1155
1156 static void ip6gre_tnl_copy_tnl_parm(struct ip6_tnl *t,
1157                                      const struct __ip6_tnl_parm *p)
1158 {
1159         t->parms.laddr = p->laddr;
1160         t->parms.raddr = p->raddr;
1161         t->parms.flags = p->flags;
1162         t->parms.hop_limit = p->hop_limit;
1163         t->parms.encap_limit = p->encap_limit;
1164         t->parms.flowinfo = p->flowinfo;
1165         t->parms.link = p->link;
1166         t->parms.proto = p->proto;
1167         t->parms.i_key = p->i_key;
1168         t->parms.o_key = p->o_key;
1169         t->parms.i_flags = p->i_flags;
1170         t->parms.o_flags = p->o_flags;
1171         t->parms.fwmark = p->fwmark;
1172         t->parms.erspan_ver = p->erspan_ver;
1173         t->parms.index = p->index;
1174         t->parms.dir = p->dir;
1175         t->parms.hwid = p->hwid;
1176         dst_cache_reset(&t->dst_cache);
1177 }
1178
1179 static int ip6gre_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
1180                              int set_mtu)
1181 {
1182         ip6gre_tnl_copy_tnl_parm(t, p);
1183         ip6gre_tnl_link_config(t, set_mtu);
1184         return 0;
1185 }
1186
1187 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1188         const struct ip6_tnl_parm2 *u)
1189 {
1190         p->laddr = u->laddr;
1191         p->raddr = u->raddr;
1192         p->flags = u->flags;
1193         p->hop_limit = u->hop_limit;
1194         p->encap_limit = u->encap_limit;
1195         p->flowinfo = u->flowinfo;
1196         p->link = u->link;
1197         p->i_key = u->i_key;
1198         p->o_key = u->o_key;
1199         p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1200         p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1201         memcpy(p->name, u->name, sizeof(u->name));
1202 }
1203
1204 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1205         const struct __ip6_tnl_parm *p)
1206 {
1207         u->proto = IPPROTO_GRE;
1208         u->laddr = p->laddr;
1209         u->raddr = p->raddr;
1210         u->flags = p->flags;
1211         u->hop_limit = p->hop_limit;
1212         u->encap_limit = p->encap_limit;
1213         u->flowinfo = p->flowinfo;
1214         u->link = p->link;
1215         u->i_key = p->i_key;
1216         u->o_key = p->o_key;
1217         u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1218         u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1219         memcpy(u->name, p->name, sizeof(u->name));
1220 }
1221
1222 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1223         struct ifreq *ifr, int cmd)
1224 {
1225         int err = 0;
1226         struct ip6_tnl_parm2 p;
1227         struct __ip6_tnl_parm p1;
1228         struct ip6_tnl *t = netdev_priv(dev);
1229         struct net *net = t->net;
1230         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1231
1232         memset(&p1, 0, sizeof(p1));
1233
1234         switch (cmd) {
1235         case SIOCGETTUNNEL:
1236                 if (dev == ign->fb_tunnel_dev) {
1237                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1238                                 err = -EFAULT;
1239                                 break;
1240                         }
1241                         ip6gre_tnl_parm_from_user(&p1, &p);
1242                         t = ip6gre_tunnel_locate(net, &p1, 0);
1243                         if (!t)
1244                                 t = netdev_priv(dev);
1245                 }
1246                 memset(&p, 0, sizeof(p));
1247                 ip6gre_tnl_parm_to_user(&p, &t->parms);
1248                 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1249                         err = -EFAULT;
1250                 break;
1251
1252         case SIOCADDTUNNEL:
1253         case SIOCCHGTUNNEL:
1254                 err = -EPERM;
1255                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1256                         goto done;
1257
1258                 err = -EFAULT;
1259                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1260                         goto done;
1261
1262                 err = -EINVAL;
1263                 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1264                         goto done;
1265
1266                 if (!(p.i_flags&GRE_KEY))
1267                         p.i_key = 0;
1268                 if (!(p.o_flags&GRE_KEY))
1269                         p.o_key = 0;
1270
1271                 ip6gre_tnl_parm_from_user(&p1, &p);
1272                 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1273
1274                 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1275                         if (t) {
1276                                 if (t->dev != dev) {
1277                                         err = -EEXIST;
1278                                         break;
1279                                 }
1280                         } else {
1281                                 t = netdev_priv(dev);
1282
1283                                 ip6gre_tunnel_unlink(ign, t);
1284                                 synchronize_net();
1285                                 ip6gre_tnl_change(t, &p1, 1);
1286                                 ip6gre_tunnel_link(ign, t);
1287                                 netdev_state_change(dev);
1288                         }
1289                 }
1290
1291                 if (t) {
1292                         err = 0;
1293
1294                         memset(&p, 0, sizeof(p));
1295                         ip6gre_tnl_parm_to_user(&p, &t->parms);
1296                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1297                                 err = -EFAULT;
1298                 } else
1299                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1300                 break;
1301
1302         case SIOCDELTUNNEL:
1303                 err = -EPERM;
1304                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1305                         goto done;
1306
1307                 if (dev == ign->fb_tunnel_dev) {
1308                         err = -EFAULT;
1309                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1310                                 goto done;
1311                         err = -ENOENT;
1312                         ip6gre_tnl_parm_from_user(&p1, &p);
1313                         t = ip6gre_tunnel_locate(net, &p1, 0);
1314                         if (!t)
1315                                 goto done;
1316                         err = -EPERM;
1317                         if (t == netdev_priv(ign->fb_tunnel_dev))
1318                                 goto done;
1319                         dev = t->dev;
1320                 }
1321                 unregister_netdevice(dev);
1322                 err = 0;
1323                 break;
1324
1325         default:
1326                 err = -EINVAL;
1327         }
1328
1329 done:
1330         return err;
1331 }
1332
1333 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1334                          unsigned short type, const void *daddr,
1335                          const void *saddr, unsigned int len)
1336 {
1337         struct ip6_tnl *t = netdev_priv(dev);
1338         struct ipv6hdr *ipv6h;
1339         __be16 *p;
1340
1341         ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1342         ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1343                                                   t->fl.u.ip6.flowlabel,
1344                                                   true, &t->fl.u.ip6));
1345         ipv6h->hop_limit = t->parms.hop_limit;
1346         ipv6h->nexthdr = NEXTHDR_GRE;
1347         ipv6h->saddr = t->parms.laddr;
1348         ipv6h->daddr = t->parms.raddr;
1349
1350         p = (__be16 *)(ipv6h + 1);
1351         p[0] = t->parms.o_flags;
1352         p[1] = htons(type);
1353
1354         /*
1355          *      Set the source hardware address.
1356          */
1357
1358         if (saddr)
1359                 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1360         if (daddr)
1361                 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1362         if (!ipv6_addr_any(&ipv6h->daddr))
1363                 return t->hlen;
1364
1365         return -t->hlen;
1366 }
1367
1368 static const struct header_ops ip6gre_header_ops = {
1369         .create = ip6gre_header,
1370 };
1371
1372 static const struct net_device_ops ip6gre_netdev_ops = {
1373         .ndo_init               = ip6gre_tunnel_init,
1374         .ndo_uninit             = ip6gre_tunnel_uninit,
1375         .ndo_start_xmit         = ip6gre_tunnel_xmit,
1376         .ndo_do_ioctl           = ip6gre_tunnel_ioctl,
1377         .ndo_change_mtu         = ip6_tnl_change_mtu,
1378         .ndo_get_stats64        = ip_tunnel_get_stats64,
1379         .ndo_get_iflink         = ip6_tnl_get_iflink,
1380 };
1381
1382 static void ip6gre_dev_free(struct net_device *dev)
1383 {
1384         struct ip6_tnl *t = netdev_priv(dev);
1385
1386         gro_cells_destroy(&t->gro_cells);
1387         dst_cache_destroy(&t->dst_cache);
1388         free_percpu(dev->tstats);
1389 }
1390
1391 static void ip6gre_tunnel_setup(struct net_device *dev)
1392 {
1393         dev->netdev_ops = &ip6gre_netdev_ops;
1394         dev->needs_free_netdev = true;
1395         dev->priv_destructor = ip6gre_dev_free;
1396
1397         dev->type = ARPHRD_IP6GRE;
1398
1399         dev->flags |= IFF_NOARP;
1400         dev->addr_len = sizeof(struct in6_addr);
1401         netif_keep_dst(dev);
1402         /* This perm addr will be used as interface identifier by IPv6 */
1403         dev->addr_assign_type = NET_ADDR_RANDOM;
1404         eth_random_addr(dev->perm_addr);
1405 }
1406
1407 #define GRE6_FEATURES (NETIF_F_SG |             \
1408                        NETIF_F_FRAGLIST |       \
1409                        NETIF_F_HIGHDMA |        \
1410                        NETIF_F_HW_CSUM)
1411
1412 static void ip6gre_tnl_init_features(struct net_device *dev)
1413 {
1414         struct ip6_tnl *nt = netdev_priv(dev);
1415
1416         dev->features           |= GRE6_FEATURES;
1417         dev->hw_features        |= GRE6_FEATURES;
1418
1419         if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1420                 /* TCP offload with GRE SEQ is not supported, nor
1421                  * can we support 2 levels of outer headers requiring
1422                  * an update.
1423                  */
1424                 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1425                     nt->encap.type == TUNNEL_ENCAP_NONE) {
1426                         dev->features    |= NETIF_F_GSO_SOFTWARE;
1427                         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1428                 }
1429
1430                 /* Can use a lockless transmit, unless we generate
1431                  * output sequences
1432                  */
1433                 dev->features |= NETIF_F_LLTX;
1434         }
1435 }
1436
1437 static int ip6gre_tunnel_init_common(struct net_device *dev)
1438 {
1439         struct ip6_tnl *tunnel;
1440         int ret;
1441         int t_hlen;
1442
1443         tunnel = netdev_priv(dev);
1444
1445         tunnel->dev = dev;
1446         tunnel->net = dev_net(dev);
1447         strcpy(tunnel->parms.name, dev->name);
1448
1449         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1450         if (!dev->tstats)
1451                 return -ENOMEM;
1452
1453         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1454         if (ret)
1455                 goto cleanup_alloc_pcpu_stats;
1456
1457         ret = gro_cells_init(&tunnel->gro_cells, dev);
1458         if (ret)
1459                 goto cleanup_dst_cache_init;
1460
1461         t_hlen = ip6gre_calc_hlen(tunnel);
1462         dev->mtu = ETH_DATA_LEN - t_hlen;
1463         if (dev->type == ARPHRD_ETHER)
1464                 dev->mtu -= ETH_HLEN;
1465         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1466                 dev->mtu -= 8;
1467
1468         if (tunnel->parms.collect_md) {
1469                 dev->features |= NETIF_F_NETNS_LOCAL;
1470                 netif_keep_dst(dev);
1471         }
1472         ip6gre_tnl_init_features(dev);
1473
1474         return 0;
1475
1476 cleanup_dst_cache_init:
1477         dst_cache_destroy(&tunnel->dst_cache);
1478 cleanup_alloc_pcpu_stats:
1479         free_percpu(dev->tstats);
1480         dev->tstats = NULL;
1481         return ret;
1482 }
1483
1484 static int ip6gre_tunnel_init(struct net_device *dev)
1485 {
1486         struct ip6_tnl *tunnel;
1487         int ret;
1488
1489         ret = ip6gre_tunnel_init_common(dev);
1490         if (ret)
1491                 return ret;
1492
1493         tunnel = netdev_priv(dev);
1494
1495         if (tunnel->parms.collect_md)
1496                 return 0;
1497
1498         memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1499         memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1500
1501         if (ipv6_addr_any(&tunnel->parms.raddr))
1502                 dev->header_ops = &ip6gre_header_ops;
1503
1504         return 0;
1505 }
1506
1507 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1508 {
1509         struct ip6_tnl *tunnel = netdev_priv(dev);
1510
1511         tunnel->dev = dev;
1512         tunnel->net = dev_net(dev);
1513         strcpy(tunnel->parms.name, dev->name);
1514
1515         tunnel->hlen            = sizeof(struct ipv6hdr) + 4;
1516
1517         dev_hold(dev);
1518 }
1519
1520 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1521         .handler     = gre_rcv,
1522         .err_handler = ip6gre_err,
1523         .flags       = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1524 };
1525
1526 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1527 {
1528         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1529         struct net_device *dev, *aux;
1530         int prio;
1531
1532         for_each_netdev_safe(net, dev, aux)
1533                 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1534                     dev->rtnl_link_ops == &ip6gre_tap_ops ||
1535                     dev->rtnl_link_ops == &ip6erspan_tap_ops)
1536                         unregister_netdevice_queue(dev, head);
1537
1538         for (prio = 0; prio < 4; prio++) {
1539                 int h;
1540                 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1541                         struct ip6_tnl *t;
1542
1543                         t = rtnl_dereference(ign->tunnels[prio][h]);
1544
1545                         while (t) {
1546                                 /* If dev is in the same netns, it has already
1547                                  * been added to the list by the previous loop.
1548                                  */
1549                                 if (!net_eq(dev_net(t->dev), net))
1550                                         unregister_netdevice_queue(t->dev,
1551                                                                    head);
1552                                 t = rtnl_dereference(t->next);
1553                         }
1554                 }
1555         }
1556 }
1557
1558 static int __net_init ip6gre_init_net(struct net *net)
1559 {
1560         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1561         int err;
1562
1563         if (!net_has_fallback_tunnels(net))
1564                 return 0;
1565         ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1566                                           NET_NAME_UNKNOWN,
1567                                           ip6gre_tunnel_setup);
1568         if (!ign->fb_tunnel_dev) {
1569                 err = -ENOMEM;
1570                 goto err_alloc_dev;
1571         }
1572         dev_net_set(ign->fb_tunnel_dev, net);
1573         /* FB netdevice is special: we have one, and only one per netns.
1574          * Allowing to move it to another netns is clearly unsafe.
1575          */
1576         ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1577
1578
1579         ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1580         ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1581
1582         err = register_netdev(ign->fb_tunnel_dev);
1583         if (err)
1584                 goto err_reg_dev;
1585
1586         rcu_assign_pointer(ign->tunnels_wc[0],
1587                            netdev_priv(ign->fb_tunnel_dev));
1588         return 0;
1589
1590 err_reg_dev:
1591         free_netdev(ign->fb_tunnel_dev);
1592 err_alloc_dev:
1593         return err;
1594 }
1595
1596 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1597 {
1598         struct net *net;
1599         LIST_HEAD(list);
1600
1601         rtnl_lock();
1602         list_for_each_entry(net, net_list, exit_list)
1603                 ip6gre_destroy_tunnels(net, &list);
1604         unregister_netdevice_many(&list);
1605         rtnl_unlock();
1606 }
1607
1608 static struct pernet_operations ip6gre_net_ops = {
1609         .init = ip6gre_init_net,
1610         .exit_batch = ip6gre_exit_batch_net,
1611         .id   = &ip6gre_net_id,
1612         .size = sizeof(struct ip6gre_net),
1613 };
1614
1615 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1616                                   struct netlink_ext_ack *extack)
1617 {
1618         __be16 flags;
1619
1620         if (!data)
1621                 return 0;
1622
1623         flags = 0;
1624         if (data[IFLA_GRE_IFLAGS])
1625                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1626         if (data[IFLA_GRE_OFLAGS])
1627                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1628         if (flags & (GRE_VERSION|GRE_ROUTING))
1629                 return -EINVAL;
1630
1631         return 0;
1632 }
1633
1634 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1635                                struct netlink_ext_ack *extack)
1636 {
1637         struct in6_addr daddr;
1638
1639         if (tb[IFLA_ADDRESS]) {
1640                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1641                         return -EINVAL;
1642                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1643                         return -EADDRNOTAVAIL;
1644         }
1645
1646         if (!data)
1647                 goto out;
1648
1649         if (data[IFLA_GRE_REMOTE]) {
1650                 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1651                 if (ipv6_addr_any(&daddr))
1652                         return -EINVAL;
1653         }
1654
1655 out:
1656         return ip6gre_tunnel_validate(tb, data, extack);
1657 }
1658
1659 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1660                                   struct netlink_ext_ack *extack)
1661 {
1662         __be16 flags = 0;
1663         int ret, ver = 0;
1664
1665         if (!data)
1666                 return 0;
1667
1668         ret = ip6gre_tap_validate(tb, data, extack);
1669         if (ret)
1670                 return ret;
1671
1672         /* ERSPAN should only have GRE sequence and key flag */
1673         if (data[IFLA_GRE_OFLAGS])
1674                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1675         if (data[IFLA_GRE_IFLAGS])
1676                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1677         if (!data[IFLA_GRE_COLLECT_METADATA] &&
1678             flags != (GRE_SEQ | GRE_KEY))
1679                 return -EINVAL;
1680
1681         /* ERSPAN Session ID only has 10-bit. Since we reuse
1682          * 32-bit key field as ID, check it's range.
1683          */
1684         if (data[IFLA_GRE_IKEY] &&
1685             (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1686                 return -EINVAL;
1687
1688         if (data[IFLA_GRE_OKEY] &&
1689             (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1690                 return -EINVAL;
1691
1692         if (data[IFLA_GRE_ERSPAN_VER]) {
1693                 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1694                 if (ver != 1 && ver != 2)
1695                         return -EINVAL;
1696         }
1697
1698         if (ver == 1) {
1699                 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1700                         u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1701
1702                         if (index & ~INDEX_MASK)
1703                                 return -EINVAL;
1704                 }
1705         } else if (ver == 2) {
1706                 if (data[IFLA_GRE_ERSPAN_DIR]) {
1707                         u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1708
1709                         if (dir & ~(DIR_MASK >> DIR_OFFSET))
1710                                 return -EINVAL;
1711                 }
1712
1713                 if (data[IFLA_GRE_ERSPAN_HWID]) {
1714                         u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1715
1716                         if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1717                                 return -EINVAL;
1718                 }
1719         }
1720
1721         return 0;
1722 }
1723
1724 static void ip6erspan_set_version(struct nlattr *data[],
1725                                   struct __ip6_tnl_parm *parms)
1726 {
1727         if (!data)
1728                 return;
1729
1730         parms->erspan_ver = 1;
1731         if (data[IFLA_GRE_ERSPAN_VER])
1732                 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1733
1734         if (parms->erspan_ver == 1) {
1735                 if (data[IFLA_GRE_ERSPAN_INDEX])
1736                         parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1737         } else if (parms->erspan_ver == 2) {
1738                 if (data[IFLA_GRE_ERSPAN_DIR])
1739                         parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1740                 if (data[IFLA_GRE_ERSPAN_HWID])
1741                         parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1742         }
1743 }
1744
1745 static void ip6gre_netlink_parms(struct nlattr *data[],
1746                                 struct __ip6_tnl_parm *parms)
1747 {
1748         memset(parms, 0, sizeof(*parms));
1749
1750         if (!data)
1751                 return;
1752
1753         if (data[IFLA_GRE_LINK])
1754                 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1755
1756         if (data[IFLA_GRE_IFLAGS])
1757                 parms->i_flags = gre_flags_to_tnl_flags(
1758                                 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1759
1760         if (data[IFLA_GRE_OFLAGS])
1761                 parms->o_flags = gre_flags_to_tnl_flags(
1762                                 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1763
1764         if (data[IFLA_GRE_IKEY])
1765                 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1766
1767         if (data[IFLA_GRE_OKEY])
1768                 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1769
1770         if (data[IFLA_GRE_LOCAL])
1771                 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1772
1773         if (data[IFLA_GRE_REMOTE])
1774                 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1775
1776         if (data[IFLA_GRE_TTL])
1777                 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1778
1779         if (data[IFLA_GRE_ENCAP_LIMIT])
1780                 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1781
1782         if (data[IFLA_GRE_FLOWINFO])
1783                 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1784
1785         if (data[IFLA_GRE_FLAGS])
1786                 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1787
1788         if (data[IFLA_GRE_FWMARK])
1789                 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1790
1791         if (data[IFLA_GRE_COLLECT_METADATA])
1792                 parms->collect_md = true;
1793 }
1794
1795 static int ip6gre_tap_init(struct net_device *dev)
1796 {
1797         int ret;
1798
1799         ret = ip6gre_tunnel_init_common(dev);
1800         if (ret)
1801                 return ret;
1802
1803         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1804
1805         return 0;
1806 }
1807
1808 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1809         .ndo_init = ip6gre_tap_init,
1810         .ndo_uninit = ip6gre_tunnel_uninit,
1811         .ndo_start_xmit = ip6gre_tunnel_xmit,
1812         .ndo_set_mac_address = eth_mac_addr,
1813         .ndo_validate_addr = eth_validate_addr,
1814         .ndo_change_mtu = ip6_tnl_change_mtu,
1815         .ndo_get_stats64 = ip_tunnel_get_stats64,
1816         .ndo_get_iflink = ip6_tnl_get_iflink,
1817 };
1818
1819 static int ip6erspan_calc_hlen(struct ip6_tnl *tunnel)
1820 {
1821         int t_hlen;
1822
1823         tunnel->tun_hlen = 8;
1824         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1825                        erspan_hdr_len(tunnel->parms.erspan_ver);
1826
1827         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1828         tunnel->dev->needed_headroom = LL_MAX_HEADER + t_hlen;
1829         return t_hlen;
1830 }
1831
1832 static int ip6erspan_tap_init(struct net_device *dev)
1833 {
1834         struct ip6_tnl *tunnel;
1835         int t_hlen;
1836         int ret;
1837
1838         tunnel = netdev_priv(dev);
1839
1840         tunnel->dev = dev;
1841         tunnel->net = dev_net(dev);
1842         strcpy(tunnel->parms.name, dev->name);
1843
1844         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1845         if (!dev->tstats)
1846                 return -ENOMEM;
1847
1848         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1849         if (ret)
1850                 goto cleanup_alloc_pcpu_stats;
1851
1852         ret = gro_cells_init(&tunnel->gro_cells, dev);
1853         if (ret)
1854                 goto cleanup_dst_cache_init;
1855
1856         t_hlen = ip6erspan_calc_hlen(tunnel);
1857         dev->mtu = ETH_DATA_LEN - t_hlen;
1858         if (dev->type == ARPHRD_ETHER)
1859                 dev->mtu -= ETH_HLEN;
1860         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1861                 dev->mtu -= 8;
1862
1863         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1864         ip6erspan_tnl_link_config(tunnel, 1);
1865
1866         return 0;
1867
1868 cleanup_dst_cache_init:
1869         dst_cache_destroy(&tunnel->dst_cache);
1870 cleanup_alloc_pcpu_stats:
1871         free_percpu(dev->tstats);
1872         dev->tstats = NULL;
1873         return ret;
1874 }
1875
1876 static const struct net_device_ops ip6erspan_netdev_ops = {
1877         .ndo_init =             ip6erspan_tap_init,
1878         .ndo_uninit =           ip6erspan_tunnel_uninit,
1879         .ndo_start_xmit =       ip6erspan_tunnel_xmit,
1880         .ndo_set_mac_address =  eth_mac_addr,
1881         .ndo_validate_addr =    eth_validate_addr,
1882         .ndo_change_mtu =       ip6_tnl_change_mtu,
1883         .ndo_get_stats64 =      ip_tunnel_get_stats64,
1884         .ndo_get_iflink =       ip6_tnl_get_iflink,
1885 };
1886
1887 static void ip6gre_tap_setup(struct net_device *dev)
1888 {
1889
1890         ether_setup(dev);
1891
1892         dev->max_mtu = 0;
1893         dev->netdev_ops = &ip6gre_tap_netdev_ops;
1894         dev->needs_free_netdev = true;
1895         dev->priv_destructor = ip6gre_dev_free;
1896
1897         dev->features |= NETIF_F_NETNS_LOCAL;
1898         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1899         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1900         netif_keep_dst(dev);
1901 }
1902
1903 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1904                                        struct ip_tunnel_encap *ipencap)
1905 {
1906         bool ret = false;
1907
1908         memset(ipencap, 0, sizeof(*ipencap));
1909
1910         if (!data)
1911                 return ret;
1912
1913         if (data[IFLA_GRE_ENCAP_TYPE]) {
1914                 ret = true;
1915                 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1916         }
1917
1918         if (data[IFLA_GRE_ENCAP_FLAGS]) {
1919                 ret = true;
1920                 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1921         }
1922
1923         if (data[IFLA_GRE_ENCAP_SPORT]) {
1924                 ret = true;
1925                 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1926         }
1927
1928         if (data[IFLA_GRE_ENCAP_DPORT]) {
1929                 ret = true;
1930                 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1931         }
1932
1933         return ret;
1934 }
1935
1936 static int ip6gre_newlink_common(struct net *src_net, struct net_device *dev,
1937                                  struct nlattr *tb[], struct nlattr *data[],
1938                                  struct netlink_ext_ack *extack)
1939 {
1940         struct ip6_tnl *nt;
1941         struct ip_tunnel_encap ipencap;
1942         int err;
1943
1944         nt = netdev_priv(dev);
1945
1946         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1947                 int err = ip6_tnl_encap_setup(nt, &ipencap);
1948
1949                 if (err < 0)
1950                         return err;
1951         }
1952
1953         if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1954                 eth_hw_addr_random(dev);
1955
1956         nt->dev = dev;
1957         nt->net = dev_net(dev);
1958
1959         err = register_netdevice(dev);
1960         if (err)
1961                 goto out;
1962
1963         if (tb[IFLA_MTU])
1964                 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1965
1966         dev_hold(dev);
1967
1968 out:
1969         return err;
1970 }
1971
1972 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1973                           struct nlattr *tb[], struct nlattr *data[],
1974                           struct netlink_ext_ack *extack)
1975 {
1976         struct ip6_tnl *nt = netdev_priv(dev);
1977         struct net *net = dev_net(dev);
1978         struct ip6gre_net *ign;
1979         int err;
1980
1981         ip6gre_netlink_parms(data, &nt->parms);
1982         ign = net_generic(net, ip6gre_net_id);
1983
1984         if (nt->parms.collect_md) {
1985                 if (rtnl_dereference(ign->collect_md_tun))
1986                         return -EEXIST;
1987         } else {
1988                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1989                         return -EEXIST;
1990         }
1991
1992         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
1993         if (!err) {
1994                 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1995                 ip6gre_tunnel_link_md(ign, nt);
1996                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
1997         }
1998         return err;
1999 }
2000
2001 static struct ip6_tnl *
2002 ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
2003                          struct nlattr *data[], struct __ip6_tnl_parm *p_p,
2004                          struct netlink_ext_ack *extack)
2005 {
2006         struct ip6_tnl *t, *nt = netdev_priv(dev);
2007         struct net *net = nt->net;
2008         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2009         struct ip_tunnel_encap ipencap;
2010
2011         if (dev == ign->fb_tunnel_dev)
2012                 return ERR_PTR(-EINVAL);
2013
2014         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
2015                 int err = ip6_tnl_encap_setup(nt, &ipencap);
2016
2017                 if (err < 0)
2018                         return ERR_PTR(err);
2019         }
2020
2021         ip6gre_netlink_parms(data, p_p);
2022
2023         t = ip6gre_tunnel_locate(net, p_p, 0);
2024
2025         if (t) {
2026                 if (t->dev != dev)
2027                         return ERR_PTR(-EEXIST);
2028         } else {
2029                 t = nt;
2030         }
2031
2032         return t;
2033 }
2034
2035 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
2036                              struct nlattr *data[],
2037                              struct netlink_ext_ack *extack)
2038 {
2039         struct ip6_tnl *t = netdev_priv(dev);
2040         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
2041         struct __ip6_tnl_parm p;
2042
2043         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2044         if (IS_ERR(t))
2045                 return PTR_ERR(t);
2046
2047         ip6gre_tunnel_unlink_md(ign, t);
2048         ip6gre_tunnel_unlink(ign, t);
2049         ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
2050         ip6gre_tunnel_link_md(ign, t);
2051         ip6gre_tunnel_link(ign, t);
2052         return 0;
2053 }
2054
2055 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
2056 {
2057         struct net *net = dev_net(dev);
2058         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
2059
2060         if (dev != ign->fb_tunnel_dev)
2061                 unregister_netdevice_queue(dev, head);
2062 }
2063
2064 static size_t ip6gre_get_size(const struct net_device *dev)
2065 {
2066         return
2067                 /* IFLA_GRE_LINK */
2068                 nla_total_size(4) +
2069                 /* IFLA_GRE_IFLAGS */
2070                 nla_total_size(2) +
2071                 /* IFLA_GRE_OFLAGS */
2072                 nla_total_size(2) +
2073                 /* IFLA_GRE_IKEY */
2074                 nla_total_size(4) +
2075                 /* IFLA_GRE_OKEY */
2076                 nla_total_size(4) +
2077                 /* IFLA_GRE_LOCAL */
2078                 nla_total_size(sizeof(struct in6_addr)) +
2079                 /* IFLA_GRE_REMOTE */
2080                 nla_total_size(sizeof(struct in6_addr)) +
2081                 /* IFLA_GRE_TTL */
2082                 nla_total_size(1) +
2083                 /* IFLA_GRE_ENCAP_LIMIT */
2084                 nla_total_size(1) +
2085                 /* IFLA_GRE_FLOWINFO */
2086                 nla_total_size(4) +
2087                 /* IFLA_GRE_FLAGS */
2088                 nla_total_size(4) +
2089                 /* IFLA_GRE_ENCAP_TYPE */
2090                 nla_total_size(2) +
2091                 /* IFLA_GRE_ENCAP_FLAGS */
2092                 nla_total_size(2) +
2093                 /* IFLA_GRE_ENCAP_SPORT */
2094                 nla_total_size(2) +
2095                 /* IFLA_GRE_ENCAP_DPORT */
2096                 nla_total_size(2) +
2097                 /* IFLA_GRE_COLLECT_METADATA */
2098                 nla_total_size(0) +
2099                 /* IFLA_GRE_FWMARK */
2100                 nla_total_size(4) +
2101                 /* IFLA_GRE_ERSPAN_INDEX */
2102                 nla_total_size(4) +
2103                 0;
2104 }
2105
2106 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
2107 {
2108         struct ip6_tnl *t = netdev_priv(dev);
2109         struct __ip6_tnl_parm *p = &t->parms;
2110         __be16 o_flags = p->o_flags;
2111
2112         if (p->erspan_ver == 1 || p->erspan_ver == 2) {
2113                 if (!p->collect_md)
2114                         o_flags |= TUNNEL_KEY;
2115
2116                 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2117                         goto nla_put_failure;
2118
2119                 if (p->erspan_ver == 1) {
2120                         if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2121                                 goto nla_put_failure;
2122                 } else {
2123                         if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2124                                 goto nla_put_failure;
2125                         if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2126                                 goto nla_put_failure;
2127                 }
2128         }
2129
2130         if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
2131             nla_put_be16(skb, IFLA_GRE_IFLAGS,
2132                          gre_tnl_flags_to_gre_flags(p->i_flags)) ||
2133             nla_put_be16(skb, IFLA_GRE_OFLAGS,
2134                          gre_tnl_flags_to_gre_flags(o_flags)) ||
2135             nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
2136             nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
2137             nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
2138             nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
2139             nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
2140             nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
2141             nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
2142             nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
2143             nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
2144                 goto nla_put_failure;
2145
2146         if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2147                         t->encap.type) ||
2148             nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2149                          t->encap.sport) ||
2150             nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2151                          t->encap.dport) ||
2152             nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2153                         t->encap.flags))
2154                 goto nla_put_failure;
2155
2156         if (p->collect_md) {
2157                 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2158                         goto nla_put_failure;
2159         }
2160
2161         return 0;
2162
2163 nla_put_failure:
2164         return -EMSGSIZE;
2165 }
2166
2167 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2168         [IFLA_GRE_LINK]        = { .type = NLA_U32 },
2169         [IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2170         [IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2171         [IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2172         [IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2173         [IFLA_GRE_LOCAL]       = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2174         [IFLA_GRE_REMOTE]      = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2175         [IFLA_GRE_TTL]         = { .type = NLA_U8 },
2176         [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2177         [IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2178         [IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2179         [IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2180         [IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2181         [IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2182         [IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2183         [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2184         [IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2185         [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2186         [IFLA_GRE_ERSPAN_VER]   = { .type = NLA_U8 },
2187         [IFLA_GRE_ERSPAN_DIR]   = { .type = NLA_U8 },
2188         [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
2189 };
2190
2191 static void ip6erspan_tap_setup(struct net_device *dev)
2192 {
2193         ether_setup(dev);
2194
2195         dev->netdev_ops = &ip6erspan_netdev_ops;
2196         dev->needs_free_netdev = true;
2197         dev->priv_destructor = ip6gre_dev_free;
2198
2199         dev->features |= NETIF_F_NETNS_LOCAL;
2200         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2201         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2202         netif_keep_dst(dev);
2203 }
2204
2205 static int ip6erspan_newlink(struct net *src_net, struct net_device *dev,
2206                              struct nlattr *tb[], struct nlattr *data[],
2207                              struct netlink_ext_ack *extack)
2208 {
2209         struct ip6_tnl *nt = netdev_priv(dev);
2210         struct net *net = dev_net(dev);
2211         struct ip6gre_net *ign;
2212         int err;
2213
2214         ip6gre_netlink_parms(data, &nt->parms);
2215         ip6erspan_set_version(data, &nt->parms);
2216         ign = net_generic(net, ip6gre_net_id);
2217
2218         if (nt->parms.collect_md) {
2219                 if (rtnl_dereference(ign->collect_md_tun_erspan))
2220                         return -EEXIST;
2221         } else {
2222                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
2223                         return -EEXIST;
2224         }
2225
2226         err = ip6gre_newlink_common(src_net, dev, tb, data, extack);
2227         if (!err) {
2228                 ip6erspan_tnl_link_config(nt, !tb[IFLA_MTU]);
2229                 ip6erspan_tunnel_link_md(ign, nt);
2230                 ip6gre_tunnel_link(net_generic(net, ip6gre_net_id), nt);
2231         }
2232         return err;
2233 }
2234
2235 static void ip6erspan_tnl_link_config(struct ip6_tnl *t, int set_mtu)
2236 {
2237         ip6gre_tnl_link_config_common(t);
2238         ip6gre_tnl_link_config_route(t, set_mtu, ip6erspan_calc_hlen(t));
2239 }
2240
2241 static int ip6erspan_tnl_change(struct ip6_tnl *t,
2242                                 const struct __ip6_tnl_parm *p, int set_mtu)
2243 {
2244         ip6gre_tnl_copy_tnl_parm(t, p);
2245         ip6erspan_tnl_link_config(t, set_mtu);
2246         return 0;
2247 }
2248
2249 static int ip6erspan_changelink(struct net_device *dev, struct nlattr *tb[],
2250                                 struct nlattr *data[],
2251                                 struct netlink_ext_ack *extack)
2252 {
2253         struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
2254         struct __ip6_tnl_parm p;
2255         struct ip6_tnl *t;
2256
2257         t = ip6gre_changelink_common(dev, tb, data, &p, extack);
2258         if (IS_ERR(t))
2259                 return PTR_ERR(t);
2260
2261         ip6erspan_set_version(data, &p);
2262         ip6gre_tunnel_unlink_md(ign, t);
2263         ip6gre_tunnel_unlink(ign, t);
2264         ip6erspan_tnl_change(t, &p, !tb[IFLA_MTU]);
2265         ip6erspan_tunnel_link_md(ign, t);
2266         ip6gre_tunnel_link(ign, t);
2267         return 0;
2268 }
2269
2270 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2271         .kind           = "ip6gre",
2272         .maxtype        = IFLA_GRE_MAX,
2273         .policy         = ip6gre_policy,
2274         .priv_size      = sizeof(struct ip6_tnl),
2275         .setup          = ip6gre_tunnel_setup,
2276         .validate       = ip6gre_tunnel_validate,
2277         .newlink        = ip6gre_newlink,
2278         .changelink     = ip6gre_changelink,
2279         .dellink        = ip6gre_dellink,
2280         .get_size       = ip6gre_get_size,
2281         .fill_info      = ip6gre_fill_info,
2282         .get_link_net   = ip6_tnl_get_link_net,
2283 };
2284
2285 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2286         .kind           = "ip6gretap",
2287         .maxtype        = IFLA_GRE_MAX,
2288         .policy         = ip6gre_policy,
2289         .priv_size      = sizeof(struct ip6_tnl),
2290         .setup          = ip6gre_tap_setup,
2291         .validate       = ip6gre_tap_validate,
2292         .newlink        = ip6gre_newlink,
2293         .changelink     = ip6gre_changelink,
2294         .get_size       = ip6gre_get_size,
2295         .fill_info      = ip6gre_fill_info,
2296         .get_link_net   = ip6_tnl_get_link_net,
2297 };
2298
2299 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2300         .kind           = "ip6erspan",
2301         .maxtype        = IFLA_GRE_MAX,
2302         .policy         = ip6gre_policy,
2303         .priv_size      = sizeof(struct ip6_tnl),
2304         .setup          = ip6erspan_tap_setup,
2305         .validate       = ip6erspan_tap_validate,
2306         .newlink        = ip6erspan_newlink,
2307         .changelink     = ip6erspan_changelink,
2308         .get_size       = ip6gre_get_size,
2309         .fill_info      = ip6gre_fill_info,
2310         .get_link_net   = ip6_tnl_get_link_net,
2311 };
2312
2313 /*
2314  *      And now the modules code and kernel interface.
2315  */
2316
2317 static int __init ip6gre_init(void)
2318 {
2319         int err;
2320
2321         pr_info("GRE over IPv6 tunneling driver\n");
2322
2323         err = register_pernet_device(&ip6gre_net_ops);
2324         if (err < 0)
2325                 return err;
2326
2327         err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2328         if (err < 0) {
2329                 pr_info("%s: can't add protocol\n", __func__);
2330                 goto add_proto_failed;
2331         }
2332
2333         err = rtnl_link_register(&ip6gre_link_ops);
2334         if (err < 0)
2335                 goto rtnl_link_failed;
2336
2337         err = rtnl_link_register(&ip6gre_tap_ops);
2338         if (err < 0)
2339                 goto tap_ops_failed;
2340
2341         err = rtnl_link_register(&ip6erspan_tap_ops);
2342         if (err < 0)
2343                 goto erspan_link_failed;
2344
2345 out:
2346         return err;
2347
2348 erspan_link_failed:
2349         rtnl_link_unregister(&ip6gre_tap_ops);
2350 tap_ops_failed:
2351         rtnl_link_unregister(&ip6gre_link_ops);
2352 rtnl_link_failed:
2353         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2354 add_proto_failed:
2355         unregister_pernet_device(&ip6gre_net_ops);
2356         goto out;
2357 }
2358
2359 static void __exit ip6gre_fini(void)
2360 {
2361         rtnl_link_unregister(&ip6gre_tap_ops);
2362         rtnl_link_unregister(&ip6gre_link_ops);
2363         rtnl_link_unregister(&ip6erspan_tap_ops);
2364         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2365         unregister_pernet_device(&ip6gre_net_ops);
2366 }
2367
2368 module_init(ip6gre_init);
2369 module_exit(ip6gre_fini);
2370 MODULE_LICENSE("GPL");
2371 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2372 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2373 MODULE_ALIAS_RTNL_LINK("ip6gre");
2374 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2375 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2376 MODULE_ALIAS_NETDEV("ip6gre0");