git.rot13.org Git - linux/blob - 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 net_device *fb_tunnel_dev;
  75 };
  76
  77 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
  78 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
  79 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly;
  80 static int ip6gre_tunnel_init(struct net_device *dev);
  81 static void ip6gre_tunnel_setup(struct net_device *dev);
  82 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
  83 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
  84
  85 /* Tunnel hash table */
  86
  87 /*
  88    4 hash tables:
  89
  90    3: (remote,local)
  91    2: (remote,*)
  92    1: (*,local)
  93    0: (*,*)
  94
  95    We require exact key match i.e. if a key is present in packet
  96    it will match only tunnel with the same key; if it is not present,
  97    it will match only keyless tunnel.
  98
  99    All keysless packets, if not matched configured keyless tunnels
 100    will match fallback tunnel.
 101  */
 102
 103 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
 104 static u32 HASH_ADDR(const struct in6_addr *addr)
 105 {
 106         u32 hash = ipv6_addr_hash(addr);
 107
 108         return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
 109 }
 110
 111 #define tunnels_r_l     tunnels[3]
 112 #define tunnels_r       tunnels[2]
 113 #define tunnels_l       tunnels[1]
 114 #define tunnels_wc      tunnels[0]
 115
 116 /* Given src, dst and key, find appropriate for input tunnel. */
 117
 118 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
 119                 const struct in6_addr *remote, const struct in6_addr *local,
 120                 __be32 key, __be16 gre_proto)
 121 {
 122         struct net *net = dev_net(dev);
 123         int link = dev->ifindex;
 124         unsigned int h0 = HASH_ADDR(remote);
 125         unsigned int h1 = HASH_KEY(key);
 126         struct ip6_tnl *t, *cand = NULL;
 127         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 128         int dev_type = (gre_proto == htons(ETH_P_TEB) ||
 129                         gre_proto == htons(ETH_P_ERSPAN) ||
 130                         gre_proto == htons(ETH_P_ERSPAN2)) ?
 131                        ARPHRD_ETHER : ARPHRD_IP6GRE;
 132         int score, cand_score = 4;
 133
 134         for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
 135                 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
 136                     !ipv6_addr_equal(remote, &t->parms.raddr) ||
 137                     key != t->parms.i_key ||
 138                     !(t->dev->flags & IFF_UP))
 139                         continue;
 140
 141                 if (t->dev->type != ARPHRD_IP6GRE &&
 142                     t->dev->type != dev_type)
 143                         continue;
 144
 145                 score = 0;
 146                 if (t->parms.link != link)
 147                         score |= 1;
 148                 if (t->dev->type != dev_type)
 149                         score |= 2;
 150                 if (score == 0)
 151                         return t;
 152
 153                 if (score < cand_score) {
 154                         cand = t;
 155                         cand_score = score;
 156                 }
 157         }
 158
 159         for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
 160                 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
 161                     key != t->parms.i_key ||
 162                     !(t->dev->flags & IFF_UP))
 163                         continue;
 164
 165                 if (t->dev->type != ARPHRD_IP6GRE &&
 166                     t->dev->type != dev_type)
 167                         continue;
 168
 169                 score = 0;
 170                 if (t->parms.link != link)
 171                         score |= 1;
 172                 if (t->dev->type != dev_type)
 173                         score |= 2;
 174                 if (score == 0)
 175                         return t;
 176
 177                 if (score < cand_score) {
 178                         cand = t;
 179                         cand_score = score;
 180                 }
 181         }
 182
 183         for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
 184                 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
 185                           (!ipv6_addr_equal(local, &t->parms.raddr) ||
 186                                  !ipv6_addr_is_multicast(local))) ||
 187                     key != t->parms.i_key ||
 188                     !(t->dev->flags & IFF_UP))
 189                         continue;
 190
 191                 if (t->dev->type != ARPHRD_IP6GRE &&
 192                     t->dev->type != dev_type)
 193                         continue;
 194
 195                 score = 0;
 196                 if (t->parms.link != link)
 197                         score |= 1;
 198                 if (t->dev->type != dev_type)
 199                         score |= 2;
 200                 if (score == 0)
 201                         return t;
 202
 203                 if (score < cand_score) {
 204                         cand = t;
 205                         cand_score = score;
 206                 }
 207         }
 208
 209         for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
 210                 if (t->parms.i_key != key ||
 211                     !(t->dev->flags & IFF_UP))
 212                         continue;
 213
 214                 if (t->dev->type != ARPHRD_IP6GRE &&
 215                     t->dev->type != dev_type)
 216                         continue;
 217
 218                 score = 0;
 219                 if (t->parms.link != link)
 220                         score |= 1;
 221                 if (t->dev->type != dev_type)
 222                         score |= 2;
 223                 if (score == 0)
 224                         return t;
 225
 226                 if (score < cand_score) {
 227                         cand = t;
 228                         cand_score = score;
 229                 }
 230         }
 231
 232         if (cand)
 233                 return cand;
 234
 235         t = rcu_dereference(ign->collect_md_tun);
 236         if (t && t->dev->flags & IFF_UP)
 237                 return t;
 238
 239         dev = ign->fb_tunnel_dev;
 240         if (dev && dev->flags & IFF_UP)
 241                 return netdev_priv(dev);
 242
 243         return NULL;
 244 }
 245
 246 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
 247                 const struct __ip6_tnl_parm *p)
 248 {
 249         const struct in6_addr *remote = &p->raddr;
 250         const struct in6_addr *local = &p->laddr;
 251         unsigned int h = HASH_KEY(p->i_key);
 252         int prio = 0;
 253
 254         if (!ipv6_addr_any(local))
 255                 prio |= 1;
 256         if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
 257                 prio |= 2;
 258                 h ^= HASH_ADDR(remote);
 259         }
 260
 261         return &ign->tunnels[prio][h];
 262 }
 263
 264 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
 265                 const struct ip6_tnl *t)
 266 {
 267         return __ip6gre_bucket(ign, &t->parms);
 268 }
 269
 270 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
 271 {
 272         struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
 273
 274         if (t->parms.collect_md)
 275                 rcu_assign_pointer(ign->collect_md_tun, t);
 276
 277         rcu_assign_pointer(t->next, rtnl_dereference(*tp));
 278         rcu_assign_pointer(*tp, t);
 279 }
 280
 281 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
 282 {
 283         struct ip6_tnl __rcu **tp;
 284         struct ip6_tnl *iter;
 285
 286         if (t->parms.collect_md)
 287                 rcu_assign_pointer(ign->collect_md_tun, NULL);
 288
 289         for (tp = ip6gre_bucket(ign, t);
 290              (iter = rtnl_dereference(*tp)) != NULL;
 291              tp = &iter->next) {
 292                 if (t == iter) {
 293                         rcu_assign_pointer(*tp, t->next);
 294                         break;
 295                 }
 296         }
 297 }
 298
 299 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
 300                                            const struct __ip6_tnl_parm *parms,
 301                                            int type)
 302 {
 303         const struct in6_addr *remote = &parms->raddr;
 304         const struct in6_addr *local = &parms->laddr;
 305         __be32 key = parms->i_key;
 306         int link = parms->link;
 307         struct ip6_tnl *t;
 308         struct ip6_tnl __rcu **tp;
 309         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 310
 311         for (tp = __ip6gre_bucket(ign, parms);
 312              (t = rtnl_dereference(*tp)) != NULL;
 313              tp = &t->next)
 314                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
 315                     ipv6_addr_equal(remote, &t->parms.raddr) &&
 316                     key == t->parms.i_key &&
 317                     link == t->parms.link &&
 318                     type == t->dev->type)
 319                         break;
 320
 321         return t;
 322 }
 323
 324 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
 325                 const struct __ip6_tnl_parm *parms, int create)
 326 {
 327         struct ip6_tnl *t, *nt;
 328         struct net_device *dev;
 329         char name[IFNAMSIZ];
 330         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
 331
 332         t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
 333         if (t && create)
 334                 return NULL;
 335         if (t || !create)
 336                 return t;
 337
 338         if (parms->name[0]) {
 339                 if (!dev_valid_name(parms->name))
 340                         return NULL;
 341                 strlcpy(name, parms->name, IFNAMSIZ);
 342         } else {
 343                 strcpy(name, "ip6gre%d");
 344         }
 345         dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
 346                            ip6gre_tunnel_setup);
 347         if (!dev)
 348                 return NULL;
 349
 350         dev_net_set(dev, net);
 351
 352         nt = netdev_priv(dev);
 353         nt->parms = *parms;
 354         dev->rtnl_link_ops = &ip6gre_link_ops;
 355
 356         nt->dev = dev;
 357         nt->net = dev_net(dev);
 358
 359         if (register_netdevice(dev) < 0)
 360                 goto failed_free;
 361
 362         ip6gre_tnl_link_config(nt, 1);
 363
 364         /* Can use a lockless transmit, unless we generate output sequences */
 365         if (!(nt->parms.o_flags & TUNNEL_SEQ))
 366                 dev->features |= NETIF_F_LLTX;
 367
 368         dev_hold(dev);
 369         ip6gre_tunnel_link(ign, nt);
 370         return nt;
 371
 372 failed_free:
 373         free_netdev(dev);
 374         return NULL;
 375 }
 376
 377 static void ip6gre_tunnel_uninit(struct net_device *dev)
 378 {
 379         struct ip6_tnl *t = netdev_priv(dev);
 380         struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
 381
 382         ip6gre_tunnel_unlink(ign, t);
 383         dst_cache_reset(&t->dst_cache);
 384         dev_put(dev);
 385 }
 386
 387
 388 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 389                        u8 type, u8 code, int offset, __be32 info)
 390 {
 391         struct net *net = dev_net(skb->dev);
 392         const struct gre_base_hdr *greh;
 393         const struct ipv6hdr *ipv6h;
 394         int grehlen = sizeof(*greh);
 395         struct ip6_tnl *t;
 396         int key_off = 0;
 397         __be16 flags;
 398         __be32 key;
 399
 400         if (!pskb_may_pull(skb, offset + grehlen))
 401                 return;
 402         greh = (const struct gre_base_hdr *)(skb->data + offset);
 403         flags = greh->flags;
 404         if (flags & (GRE_VERSION | GRE_ROUTING))
 405                 return;
 406         if (flags & GRE_CSUM)
 407                 grehlen += 4;
 408         if (flags & GRE_KEY) {
 409                 key_off = grehlen + offset;
 410                 grehlen += 4;
 411         }
 412
 413         if (!pskb_may_pull(skb, offset + grehlen))
 414                 return;
 415         ipv6h = (const struct ipv6hdr *)skb->data;
 416         greh = (const struct gre_base_hdr *)(skb->data + offset);
 417         key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
 418
 419         t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
 420                                  key, greh->protocol);
 421         if (!t)
 422                 return;
 423
 424         switch (type) {
 425                 struct ipv6_tlv_tnl_enc_lim *tel;
 426                 __u32 teli;
 427         case ICMPV6_DEST_UNREACH:
 428                 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
 429                                     t->parms.name);
 430                 if (code != ICMPV6_PORT_UNREACH)
 431                         break;
 432                 return;
 433         case ICMPV6_TIME_EXCEED:
 434                 if (code == ICMPV6_EXC_HOPLIMIT) {
 435                         net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
 436                                             t->parms.name);
 437                         break;
 438                 }
 439                 return;
 440         case ICMPV6_PARAMPROB:
 441                 teli = 0;
 442                 if (code == ICMPV6_HDR_FIELD)
 443                         teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
 444
 445                 if (teli && teli == be32_to_cpu(info) - 2) {
 446                         tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
 447                         if (tel->encap_limit == 0) {
 448                                 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
 449                                                     t->parms.name);
 450                         }
 451                 } else {
 452                         net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
 453                                             t->parms.name);
 454                 }
 455                 return;
 456         case ICMPV6_PKT_TOOBIG:
 457                 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
 458                 return;
 459         case NDISC_REDIRECT:
 460                 ip6_redirect(skb, net, skb->dev->ifindex, 0,
 461                              sock_net_uid(net, NULL));
 462                 return;
 463         }
 464
 465         if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
 466                 t->err_count++;
 467         else
 468                 t->err_count = 1;
 469         t->err_time = jiffies;
 470 }
 471
 472 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
 473 {
 474         const struct ipv6hdr *ipv6h;
 475         struct ip6_tnl *tunnel;
 476
 477         ipv6h = ipv6_hdr(skb);
 478         tunnel = ip6gre_tunnel_lookup(skb->dev,
 479                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 480                                       tpi->proto);
 481         if (tunnel) {
 482                 if (tunnel->parms.collect_md) {
 483                         struct metadata_dst *tun_dst;
 484                         __be64 tun_id;
 485                         __be16 flags;
 486
 487                         flags = tpi->flags;
 488                         tun_id = key32_to_tunnel_id(tpi->key);
 489
 490                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id, 0);
 491                         if (!tun_dst)
 492                                 return PACKET_REJECT;
 493
 494                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 495                 } else {
 496                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 497                 }
 498
 499                 return PACKET_RCVD;
 500         }
 501
 502         return PACKET_REJECT;
 503 }
 504
 505 static int ip6erspan_rcv(struct sk_buff *skb, int gre_hdr_len,
 506                          struct tnl_ptk_info *tpi)
 507 {
 508         struct erspan_base_hdr *ershdr;
 509         struct erspan_metadata *pkt_md;
 510         const struct ipv6hdr *ipv6h;
 511         struct erspan_md2 *md2;
 512         struct ip6_tnl *tunnel;
 513         u8 ver;
 514
 515         if (unlikely(!pskb_may_pull(skb, sizeof(*ershdr))))
 516                 return PACKET_REJECT;
 517
 518         ipv6h = ipv6_hdr(skb);
 519         ershdr = (struct erspan_base_hdr *)skb->data;
 520         ver = ershdr->ver;
 521         tpi->key = cpu_to_be32(get_session_id(ershdr));
 522
 523         tunnel = ip6gre_tunnel_lookup(skb->dev,
 524                                       &ipv6h->saddr, &ipv6h->daddr, tpi->key,
 525                                       tpi->proto);
 526         if (tunnel) {
 527                 int len = erspan_hdr_len(ver);
 528
 529                 if (unlikely(!pskb_may_pull(skb, len)))
 530                         return PACKET_REJECT;
 531
 532                 ershdr = (struct erspan_base_hdr *)skb->data;
 533                 pkt_md = (struct erspan_metadata *)(ershdr + 1);
 534
 535                 if (__iptunnel_pull_header(skb, len,
 536                                            htons(ETH_P_TEB),
 537                                            false, false) < 0)
 538                         return PACKET_REJECT;
 539
 540                 if (tunnel->parms.collect_md) {
 541                         struct metadata_dst *tun_dst;
 542                         struct ip_tunnel_info *info;
 543                         struct erspan_metadata *md;
 544                         __be64 tun_id;
 545                         __be16 flags;
 546
 547                         tpi->flags |= TUNNEL_KEY;
 548                         flags = tpi->flags;
 549                         tun_id = key32_to_tunnel_id(tpi->key);
 550
 551                         tun_dst = ipv6_tun_rx_dst(skb, flags, tun_id,
 552                                                   sizeof(*md));
 553                         if (!tun_dst)
 554                                 return PACKET_REJECT;
 555
 556                         info = &tun_dst->u.tun_info;
 557                         md = ip_tunnel_info_opts(info);
 558                         md->version = ver;
 559                         md2 = &md->u.md2;
 560                         memcpy(md2, pkt_md, ver == 1 ? ERSPAN_V1_MDSIZE :
 561                                                        ERSPAN_V2_MDSIZE);
 562                         info->key.tun_flags |= TUNNEL_ERSPAN_OPT;
 563                         info->options_len = sizeof(*md);
 564
 565                         ip6_tnl_rcv(tunnel, skb, tpi, tun_dst, log_ecn_error);
 566
 567                 } else {
 568                         ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
 569                 }
 570
 571                 return PACKET_RCVD;
 572         }
 573
 574         return PACKET_REJECT;
 575 }
 576
 577 static int gre_rcv(struct sk_buff *skb)
 578 {
 579         struct tnl_ptk_info tpi;
 580         bool csum_err = false;
 581         int hdr_len;
 582
 583         hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
 584         if (hdr_len < 0)
 585                 goto drop;
 586
 587         if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 588                 goto drop;
 589
 590         if (unlikely(tpi.proto == htons(ETH_P_ERSPAN) ||
 591                      tpi.proto == htons(ETH_P_ERSPAN2))) {
 592                 if (ip6erspan_rcv(skb, hdr_len, &tpi) == PACKET_RCVD)
 593                         return 0;
 594                 goto out;
 595         }
 596
 597         if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
 598                 return 0;
 599
 600 out:
 601         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 602 drop:
 603         kfree_skb(skb);
 604         return 0;
 605 }
 606
 607 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
 608 {
 609         return iptunnel_handle_offloads(skb,
 610                                         csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
 611 }
 612
 613 static void prepare_ip6gre_xmit_ipv4(struct sk_buff *skb,
 614                                      struct net_device *dev,
 615                                      struct flowi6 *fl6, __u8 *dsfield,
 616                                      int *encap_limit)
 617 {
 618         const struct iphdr *iph = ip_hdr(skb);
 619         struct ip6_tnl *t = netdev_priv(dev);
 620
 621         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 622                 *encap_limit = t->parms.encap_limit;
 623
 624         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 625
 626         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 627                 *dsfield = ipv4_get_dsfield(iph);
 628         else
 629                 *dsfield = ip6_tclass(t->parms.flowinfo);
 630
 631         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 632                 fl6->flowi6_mark = skb->mark;
 633         else
 634                 fl6->flowi6_mark = t->parms.fwmark;
 635
 636         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 637 }
 638
 639 static int prepare_ip6gre_xmit_ipv6(struct sk_buff *skb,
 640                                     struct net_device *dev,
 641                                     struct flowi6 *fl6, __u8 *dsfield,
 642                                     int *encap_limit)
 643 {
 644         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 645         struct ip6_tnl *t = netdev_priv(dev);
 646         __u16 offset;
 647
 648         offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
 649         /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
 650
 651         if (offset > 0) {
 652                 struct ipv6_tlv_tnl_enc_lim *tel;
 653
 654                 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
 655                 if (tel->encap_limit == 0) {
 656                         icmpv6_send(skb, ICMPV6_PARAMPROB,
 657                                     ICMPV6_HDR_FIELD, offset + 2);
 658                         return -1;
 659                 }
 660                 *encap_limit = tel->encap_limit - 1;
 661         } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
 662                 *encap_limit = t->parms.encap_limit;
 663         }
 664
 665         memcpy(fl6, &t->fl.u.ip6, sizeof(*fl6));
 666
 667         if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
 668                 *dsfield = ipv6_get_dsfield(ipv6h);
 669         else
 670                 *dsfield = ip6_tclass(t->parms.flowinfo);
 671
 672         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
 673                 fl6->flowlabel |= ip6_flowlabel(ipv6h);
 674
 675         if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
 676                 fl6->flowi6_mark = skb->mark;
 677         else
 678                 fl6->flowi6_mark = t->parms.fwmark;
 679
 680         fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 681
 682         return 0;
 683 }
 684
 685 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
 686                                struct net_device *dev, __u8 dsfield,
 687                                struct flowi6 *fl6, int encap_limit,
 688                                __u32 *pmtu, __be16 proto)
 689 {
 690         struct ip6_tnl *tunnel = netdev_priv(dev);
 691         __be16 protocol;
 692
 693         if (dev->type == ARPHRD_ETHER)
 694                 IPCB(skb)->flags = 0;
 695
 696         if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
 697                 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
 698         else
 699                 fl6->daddr = tunnel->parms.raddr;
 700
 701         /* Push GRE header. */
 702         protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
 703
 704         if (tunnel->parms.collect_md) {
 705                 struct ip_tunnel_info *tun_info;
 706                 const struct ip_tunnel_key *key;
 707                 __be16 flags;
 708
 709                 tun_info = skb_tunnel_info(skb);
 710                 if (unlikely(!tun_info ||
 711                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
 712                              ip_tunnel_info_af(tun_info) != AF_INET6))
 713                         return -EINVAL;
 714
 715                 key = &tun_info->key;
 716                 memset(fl6, 0, sizeof(*fl6));
 717                 fl6->flowi6_proto = IPPROTO_GRE;
 718                 fl6->daddr = key->u.ipv6.dst;
 719                 fl6->flowlabel = key->label;
 720                 fl6->flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 721
 722                 dsfield = key->tos;
 723                 flags = key->tun_flags &
 724                         (TUNNEL_CSUM | TUNNEL_KEY | TUNNEL_SEQ);
 725                 tunnel->tun_hlen = gre_calc_hlen(flags);
 726
 727                 gre_build_header(skb, tunnel->tun_hlen,
 728                                  flags, protocol,
 729                                  tunnel_id_to_key32(tun_info->key.tun_id),
 730                                  (flags & TUNNEL_SEQ) ? htonl(tunnel->o_seqno++)
 731                                                       : 0);
 732
 733         } else {
 734                 if (tunnel->parms.o_flags & TUNNEL_SEQ)
 735                         tunnel->o_seqno++;
 736
 737                 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
 738                                  protocol, tunnel->parms.o_key,
 739                                  htonl(tunnel->o_seqno));
 740         }
 741
 742         return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
 743                             NEXTHDR_GRE);
 744 }
 745
 746 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
 747 {
 748         struct ip6_tnl *t = netdev_priv(dev);
 749         int encap_limit = -1;
 750         struct flowi6 fl6;
 751         __u8 dsfield = 0;
 752         __u32 mtu;
 753         int err;
 754
 755         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 756
 757         if (!t->parms.collect_md)
 758                 prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
 759                                          &dsfield, &encap_limit);
 760
 761         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 762         if (err)
 763                 return -1;
 764
 765         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
 766                           skb->protocol);
 767         if (err != 0) {
 768                 /* XXX: send ICMP error even if DF is not set. */
 769                 if (err == -EMSGSIZE)
 770                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 771                                   htonl(mtu));
 772                 return -1;
 773         }
 774
 775         return 0;
 776 }
 777
 778 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
 779 {
 780         struct ip6_tnl *t = netdev_priv(dev);
 781         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 782         int encap_limit = -1;
 783         struct flowi6 fl6;
 784         __u8 dsfield = 0;
 785         __u32 mtu;
 786         int err;
 787
 788         if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
 789                 return -1;
 790
 791         if (!t->parms.collect_md &&
 792             prepare_ip6gre_xmit_ipv6(skb, dev, &fl6, &dsfield, &encap_limit))
 793                 return -1;
 794
 795         if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
 796                 return -1;
 797
 798         err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
 799                           &mtu, skb->protocol);
 800         if (err != 0) {
 801                 if (err == -EMSGSIZE)
 802                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 803                 return -1;
 804         }
 805
 806         return 0;
 807 }
 808
 809 /**
 810  * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
 811  *   @t: the outgoing tunnel device
 812  *   @hdr: IPv6 header from the incoming packet
 813  *
 814  * Description:
 815  *   Avoid trivial tunneling loop by checking that tunnel exit-point
 816  *   doesn't match source of incoming packet.
 817  *
 818  * Return:
 819  *   1 if conflict,
 820  *   0 else
 821  **/
 822
 823 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
 824         const struct ipv6hdr *hdr)
 825 {
 826         return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
 827 }
 828
 829 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
 830 {
 831         struct ip6_tnl *t = netdev_priv(dev);
 832         int encap_limit = -1;
 833         struct flowi6 fl6;
 834         __u32 mtu;
 835         int err;
 836
 837         if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
 838                 encap_limit = t->parms.encap_limit;
 839
 840         if (!t->parms.collect_md)
 841                 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
 842
 843         err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
 844         if (err)
 845                 return err;
 846
 847         err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
 848
 849         return err;
 850 }
 851
 852 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
 853         struct net_device *dev)
 854 {
 855         struct ip6_tnl *t = netdev_priv(dev);
 856         struct net_device_stats *stats = &t->dev->stats;
 857         int ret;
 858
 859         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 860                 goto tx_err;
 861
 862         switch (skb->protocol) {
 863         case htons(ETH_P_IP):
 864                 ret = ip6gre_xmit_ipv4(skb, dev);
 865                 break;
 866         case htons(ETH_P_IPV6):
 867                 ret = ip6gre_xmit_ipv6(skb, dev);
 868                 break;
 869         default:
 870                 ret = ip6gre_xmit_other(skb, dev);
 871                 break;
 872         }
 873
 874         if (ret < 0)
 875                 goto tx_err;
 876
 877         return NETDEV_TX_OK;
 878
 879 tx_err:
 880         stats->tx_errors++;
 881         stats->tx_dropped++;
 882         kfree_skb(skb);
 883         return NETDEV_TX_OK;
 884 }
 885
 886 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 887                                          struct net_device *dev)
 888 {
 889         struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 890         struct ip6_tnl *t = netdev_priv(dev);
 891         struct dst_entry *dst = skb_dst(skb);
 892         struct net_device_stats *stats;
 893         bool truncate = false;
 894         int encap_limit = -1;
 895         __u8 dsfield = false;
 896         struct flowi6 fl6;
 897         int err = -EINVAL;
 898         __u32 mtu;
 899
 900         if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
 901                 goto tx_err;
 902
 903         if (gre_handle_offloads(skb, false))
 904                 goto tx_err;
 905
 906         if (skb->len > dev->mtu + dev->hard_header_len) {
 907                 pskb_trim(skb, dev->mtu + dev->hard_header_len);
 908                 truncate = true;
 909         }
 910
 911         if (skb_cow_head(skb, dev->needed_headroom))
 912                 goto tx_err;
 913
 914         t->parms.o_flags &= ~TUNNEL_KEY;
 915         IPCB(skb)->flags = 0;
 916
 917         /* For collect_md mode, derive fl6 from the tunnel key,
 918          * for native mode, call prepare_ip6gre_xmit_{ipv4,ipv6}.
 919          */
 920         if (t->parms.collect_md) {
 921                 struct ip_tunnel_info *tun_info;
 922                 const struct ip_tunnel_key *key;
 923                 struct erspan_metadata *md;
 924                 __be32 tun_id;
 925
 926                 tun_info = skb_tunnel_info(skb);
 927                 if (unlikely(!tun_info ||
 928                              !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
 929                              ip_tunnel_info_af(tun_info) != AF_INET6))
 930                         return -EINVAL;
 931
 932                 key = &tun_info->key;
 933                 memset(&fl6, 0, sizeof(fl6));
 934                 fl6.flowi6_proto = IPPROTO_GRE;
 935                 fl6.daddr = key->u.ipv6.dst;
 936                 fl6.flowlabel = key->label;
 937                 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
 938
 939                 dsfield = key->tos;
 940                 md = ip_tunnel_info_opts(tun_info);
 941                 if (!md)
 942                         goto tx_err;
 943
 944                 tun_id = tunnel_id_to_key32(key->tun_id);
 945                 if (md->version == 1) {
 946                         erspan_build_header(skb,
 947                                             ntohl(tun_id),
 948                                             ntohl(md->u.index), truncate,
 949                                             false);
 950                 } else if (md->version == 2) {
 951                         erspan_build_header_v2(skb,
 952                                                ntohl(tun_id),
 953                                                md->u.md2.dir,
 954                                                get_hwid(&md->u.md2),
 955                                                truncate, false);
 956                 } else {
 957                         goto tx_err;
 958                 }
 959         } else {
 960                 switch (skb->protocol) {
 961                 case htons(ETH_P_IP):
 962                         memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 963                         prepare_ip6gre_xmit_ipv4(skb, dev, &fl6,
 964                                                  &dsfield, &encap_limit);
 965                         break;
 966                 case htons(ETH_P_IPV6):
 967                         if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
 968                                 goto tx_err;
 969                         if (prepare_ip6gre_xmit_ipv6(skb, dev, &fl6,
 970                                                      &dsfield, &encap_limit))
 971                                 goto tx_err;
 972                         break;
 973                 default:
 974                         memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
 975                         break;
 976                 }
 977
 978                 if (t->parms.erspan_ver == 1)
 979                         erspan_build_header(skb, ntohl(t->parms.o_key),
 980                                             t->parms.index,
 981                                             truncate, false);
 982                 else
 983                         erspan_build_header_v2(skb, ntohl(t->parms.o_key),
 984                                                t->parms.dir,
 985                                                t->parms.hwid,
 986                                                truncate, false);
 987                 fl6.daddr = t->parms.raddr;
 988         }
 989
 990         /* Push GRE header. */
 991         gre_build_header(skb, 8, TUNNEL_SEQ,
 992                          htons(ETH_P_ERSPAN), 0, htonl(t->o_seqno++));
 993
 994         /* TooBig packet may have updated dst->dev's mtu */
 995         if (!t->parms.collect_md && dst && dst_mtu(dst) > dst->dev->mtu)
 996                 dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu);
 997
 998         err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
 999                            NEXTHDR_GRE);
1000         if (err != 0) {
1001                 /* XXX: send ICMP error even if DF is not set. */
1002                 if (err == -EMSGSIZE) {
1003                         if (skb->protocol == htons(ETH_P_IP))
1004                                 icmp_send(skb, ICMP_DEST_UNREACH,
1005                                           ICMP_FRAG_NEEDED, htonl(mtu));
1006                         else
1007                                 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1008                 }
1009
1010                 goto tx_err;
1011         }
1012         return NETDEV_TX_OK;
1013
1014 tx_err:
1015         stats = &t->dev->stats;
1016         stats->tx_errors++;
1017         stats->tx_dropped++;
1018         kfree_skb(skb);
1019         return NETDEV_TX_OK;
1020 }
1021
1022 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
1023 {
1024         struct net_device *dev = t->dev;
1025         struct __ip6_tnl_parm *p = &t->parms;
1026         struct flowi6 *fl6 = &t->fl.u.ip6;
1027         int t_hlen;
1028
1029         if (dev->type != ARPHRD_ETHER) {
1030                 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
1031                 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
1032         }
1033
1034         /* Set up flowi template */
1035         fl6->saddr = p->laddr;
1036         fl6->daddr = p->raddr;
1037         fl6->flowi6_oif = p->link;
1038         fl6->flowlabel = 0;
1039         fl6->flowi6_proto = IPPROTO_GRE;
1040
1041         if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
1042                 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
1043         if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
1044                 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
1045
1046         p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
1047         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
1048
1049         if (p->flags&IP6_TNL_F_CAP_XMIT &&
1050                         p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
1051                 dev->flags |= IFF_POINTOPOINT;
1052         else
1053                 dev->flags &= ~IFF_POINTOPOINT;
1054
1055         t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
1056
1057         t->hlen = t->encap_hlen + t->tun_hlen;
1058
1059         t_hlen = t->hlen + sizeof(struct ipv6hdr);
1060
1061         if (p->flags & IP6_TNL_F_CAP_XMIT) {
1062                 int strict = (ipv6_addr_type(&p->raddr) &
1063                               (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
1064
1065                 struct rt6_info *rt = rt6_lookup(t->net,
1066                                                  &p->raddr, &p->laddr,
1067                                                  p->link, NULL, strict);
1068
1069                 if (!rt)
1070                         return;
1071
1072                 if (rt->dst.dev) {
1073                         dev->hard_header_len = rt->dst.dev->hard_header_len +
1074                                                t_hlen;
1075
1076                         if (set_mtu) {
1077                                 dev->mtu = rt->dst.dev->mtu - t_hlen;
1078                                 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1079                                         dev->mtu -= 8;
1080                                 if (dev->type == ARPHRD_ETHER)
1081                                         dev->mtu -= ETH_HLEN;
1082
1083                                 if (dev->mtu < IPV6_MIN_MTU)
1084                                         dev->mtu = IPV6_MIN_MTU;
1085                         }
1086                 }
1087                 ip6_rt_put(rt);
1088         }
1089 }
1090
1091 static int ip6gre_tnl_change(struct ip6_tnl *t,
1092         const struct __ip6_tnl_parm *p, int set_mtu)
1093 {
1094         t->parms.laddr = p->laddr;
1095         t->parms.raddr = p->raddr;
1096         t->parms.flags = p->flags;
1097         t->parms.hop_limit = p->hop_limit;
1098         t->parms.encap_limit = p->encap_limit;
1099         t->parms.flowinfo = p->flowinfo;
1100         t->parms.link = p->link;
1101         t->parms.proto = p->proto;
1102         t->parms.i_key = p->i_key;
1103         t->parms.o_key = p->o_key;
1104         t->parms.i_flags = p->i_flags;
1105         t->parms.o_flags = p->o_flags;
1106         t->parms.fwmark = p->fwmark;
1107         dst_cache_reset(&t->dst_cache);
1108         ip6gre_tnl_link_config(t, set_mtu);
1109         return 0;
1110 }
1111
1112 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
1113         const struct ip6_tnl_parm2 *u)
1114 {
1115         p->laddr = u->laddr;
1116         p->raddr = u->raddr;
1117         p->flags = u->flags;
1118         p->hop_limit = u->hop_limit;
1119         p->encap_limit = u->encap_limit;
1120         p->flowinfo = u->flowinfo;
1121         p->link = u->link;
1122         p->i_key = u->i_key;
1123         p->o_key = u->o_key;
1124         p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
1125         p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
1126         memcpy(p->name, u->name, sizeof(u->name));
1127 }
1128
1129 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
1130         const struct __ip6_tnl_parm *p)
1131 {
1132         u->proto = IPPROTO_GRE;
1133         u->laddr = p->laddr;
1134         u->raddr = p->raddr;
1135         u->flags = p->flags;
1136         u->hop_limit = p->hop_limit;
1137         u->encap_limit = p->encap_limit;
1138         u->flowinfo = p->flowinfo;
1139         u->link = p->link;
1140         u->i_key = p->i_key;
1141         u->o_key = p->o_key;
1142         u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
1143         u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
1144         memcpy(u->name, p->name, sizeof(u->name));
1145 }
1146
1147 static int ip6gre_tunnel_ioctl(struct net_device *dev,
1148         struct ifreq *ifr, int cmd)
1149 {
1150         int err = 0;
1151         struct ip6_tnl_parm2 p;
1152         struct __ip6_tnl_parm p1;
1153         struct ip6_tnl *t = netdev_priv(dev);
1154         struct net *net = t->net;
1155         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1156
1157         memset(&p1, 0, sizeof(p1));
1158
1159         switch (cmd) {
1160         case SIOCGETTUNNEL:
1161                 if (dev == ign->fb_tunnel_dev) {
1162                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
1163                                 err = -EFAULT;
1164                                 break;
1165                         }
1166                         ip6gre_tnl_parm_from_user(&p1, &p);
1167                         t = ip6gre_tunnel_locate(net, &p1, 0);
1168                         if (!t)
1169                                 t = netdev_priv(dev);
1170                 }
1171                 memset(&p, 0, sizeof(p));
1172                 ip6gre_tnl_parm_to_user(&p, &t->parms);
1173                 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1174                         err = -EFAULT;
1175                 break;
1176
1177         case SIOCADDTUNNEL:
1178         case SIOCCHGTUNNEL:
1179                 err = -EPERM;
1180                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1181                         goto done;
1182
1183                 err = -EFAULT;
1184                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1185                         goto done;
1186
1187                 err = -EINVAL;
1188                 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
1189                         goto done;
1190
1191                 if (!(p.i_flags&GRE_KEY))
1192                         p.i_key = 0;
1193                 if (!(p.o_flags&GRE_KEY))
1194                         p.o_key = 0;
1195
1196                 ip6gre_tnl_parm_from_user(&p1, &p);
1197                 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
1198
1199                 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
1200                         if (t) {
1201                                 if (t->dev != dev) {
1202                                         err = -EEXIST;
1203                                         break;
1204                                 }
1205                         } else {
1206                                 t = netdev_priv(dev);
1207
1208                                 ip6gre_tunnel_unlink(ign, t);
1209                                 synchronize_net();
1210                                 ip6gre_tnl_change(t, &p1, 1);
1211                                 ip6gre_tunnel_link(ign, t);
1212                                 netdev_state_change(dev);
1213                         }
1214                 }
1215
1216                 if (t) {
1217                         err = 0;
1218
1219                         memset(&p, 0, sizeof(p));
1220                         ip6gre_tnl_parm_to_user(&p, &t->parms);
1221                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
1222                                 err = -EFAULT;
1223                 } else
1224                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
1225                 break;
1226
1227         case SIOCDELTUNNEL:
1228                 err = -EPERM;
1229                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1230                         goto done;
1231
1232                 if (dev == ign->fb_tunnel_dev) {
1233                         err = -EFAULT;
1234                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
1235                                 goto done;
1236                         err = -ENOENT;
1237                         ip6gre_tnl_parm_from_user(&p1, &p);
1238                         t = ip6gre_tunnel_locate(net, &p1, 0);
1239                         if (!t)
1240                                 goto done;
1241                         err = -EPERM;
1242                         if (t == netdev_priv(ign->fb_tunnel_dev))
1243                                 goto done;
1244                         dev = t->dev;
1245                 }
1246                 unregister_netdevice(dev);
1247                 err = 0;
1248                 break;
1249
1250         default:
1251                 err = -EINVAL;
1252         }
1253
1254 done:
1255         return err;
1256 }
1257
1258 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
1259                          unsigned short type, const void *daddr,
1260                          const void *saddr, unsigned int len)
1261 {
1262         struct ip6_tnl *t = netdev_priv(dev);
1263         struct ipv6hdr *ipv6h;
1264         __be16 *p;
1265
1266         ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
1267         ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
1268                                                   t->fl.u.ip6.flowlabel,
1269                                                   true, &t->fl.u.ip6));
1270         ipv6h->hop_limit = t->parms.hop_limit;
1271         ipv6h->nexthdr = NEXTHDR_GRE;
1272         ipv6h->saddr = t->parms.laddr;
1273         ipv6h->daddr = t->parms.raddr;
1274
1275         p = (__be16 *)(ipv6h + 1);
1276         p[0] = t->parms.o_flags;
1277         p[1] = htons(type);
1278
1279         /*
1280          *      Set the source hardware address.
1281          */
1282
1283         if (saddr)
1284                 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
1285         if (daddr)
1286                 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
1287         if (!ipv6_addr_any(&ipv6h->daddr))
1288                 return t->hlen;
1289
1290         return -t->hlen;
1291 }
1292
1293 static const struct header_ops ip6gre_header_ops = {
1294         .create = ip6gre_header,
1295 };
1296
1297 static const struct net_device_ops ip6gre_netdev_ops = {
1298         .ndo_init               = ip6gre_tunnel_init,
1299         .ndo_uninit             = ip6gre_tunnel_uninit,
1300         .ndo_start_xmit         = ip6gre_tunnel_xmit,
1301         .ndo_do_ioctl           = ip6gre_tunnel_ioctl,
1302         .ndo_change_mtu         = ip6_tnl_change_mtu,
1303         .ndo_get_stats64        = ip_tunnel_get_stats64,
1304         .ndo_get_iflink         = ip6_tnl_get_iflink,
1305 };
1306
1307 static void ip6gre_dev_free(struct net_device *dev)
1308 {
1309         struct ip6_tnl *t = netdev_priv(dev);
1310
1311         dst_cache_destroy(&t->dst_cache);
1312         free_percpu(dev->tstats);
1313 }
1314
1315 static void ip6gre_tunnel_setup(struct net_device *dev)
1316 {
1317         dev->netdev_ops = &ip6gre_netdev_ops;
1318         dev->needs_free_netdev = true;
1319         dev->priv_destructor = ip6gre_dev_free;
1320
1321         dev->type = ARPHRD_IP6GRE;
1322
1323         dev->flags |= IFF_NOARP;
1324         dev->addr_len = sizeof(struct in6_addr);
1325         netif_keep_dst(dev);
1326         /* This perm addr will be used as interface identifier by IPv6 */
1327         dev->addr_assign_type = NET_ADDR_RANDOM;
1328         eth_random_addr(dev->perm_addr);
1329 }
1330
1331 #define GRE6_FEATURES (NETIF_F_SG |             \
1332                        NETIF_F_FRAGLIST |       \
1333                        NETIF_F_HIGHDMA |        \
1334                        NETIF_F_HW_CSUM)
1335
1336 static void ip6gre_tnl_init_features(struct net_device *dev)
1337 {
1338         struct ip6_tnl *nt = netdev_priv(dev);
1339
1340         dev->features           |= GRE6_FEATURES;
1341         dev->hw_features        |= GRE6_FEATURES;
1342
1343         if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1344                 /* TCP offload with GRE SEQ is not supported, nor
1345                  * can we support 2 levels of outer headers requiring
1346                  * an update.
1347                  */
1348                 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1349                     nt->encap.type == TUNNEL_ENCAP_NONE) {
1350                         dev->features    |= NETIF_F_GSO_SOFTWARE;
1351                         dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1352                 }
1353
1354                 /* Can use a lockless transmit, unless we generate
1355                  * output sequences
1356                  */
1357                 dev->features |= NETIF_F_LLTX;
1358         }
1359 }
1360
1361 static int ip6gre_tunnel_init_common(struct net_device *dev)
1362 {
1363         struct ip6_tnl *tunnel;
1364         int ret;
1365         int t_hlen;
1366
1367         tunnel = netdev_priv(dev);
1368
1369         tunnel->dev = dev;
1370         tunnel->net = dev_net(dev);
1371         strcpy(tunnel->parms.name, dev->name);
1372
1373         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1374         if (!dev->tstats)
1375                 return -ENOMEM;
1376
1377         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1378         if (ret) {
1379                 free_percpu(dev->tstats);
1380                 dev->tstats = NULL;
1381                 return ret;
1382         }
1383
1384         tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1385         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1386         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1387
1388         dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1389         dev->mtu = ETH_DATA_LEN - t_hlen;
1390         if (dev->type == ARPHRD_ETHER)
1391                 dev->mtu -= ETH_HLEN;
1392         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1393                 dev->mtu -= 8;
1394
1395         if (tunnel->parms.collect_md) {
1396                 dev->features |= NETIF_F_NETNS_LOCAL;
1397                 netif_keep_dst(dev);
1398         }
1399         ip6gre_tnl_init_features(dev);
1400
1401         return 0;
1402 }
1403
1404 static int ip6gre_tunnel_init(struct net_device *dev)
1405 {
1406         struct ip6_tnl *tunnel;
1407         int ret;
1408
1409         ret = ip6gre_tunnel_init_common(dev);
1410         if (ret)
1411                 return ret;
1412
1413         tunnel = netdev_priv(dev);
1414
1415         if (tunnel->parms.collect_md)
1416                 return 0;
1417
1418         memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1419         memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1420
1421         if (ipv6_addr_any(&tunnel->parms.raddr))
1422                 dev->header_ops = &ip6gre_header_ops;
1423
1424         return 0;
1425 }
1426
1427 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1428 {
1429         struct ip6_tnl *tunnel = netdev_priv(dev);
1430
1431         tunnel->dev = dev;
1432         tunnel->net = dev_net(dev);
1433         strcpy(tunnel->parms.name, dev->name);
1434
1435         tunnel->hlen            = sizeof(struct ipv6hdr) + 4;
1436
1437         dev_hold(dev);
1438 }
1439
1440 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1441         .handler     = gre_rcv,
1442         .err_handler = ip6gre_err,
1443         .flags       = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1444 };
1445
1446 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1447 {
1448         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1449         struct net_device *dev, *aux;
1450         int prio;
1451
1452         for_each_netdev_safe(net, dev, aux)
1453                 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1454                     dev->rtnl_link_ops == &ip6gre_tap_ops ||
1455                     dev->rtnl_link_ops == &ip6erspan_tap_ops)
1456                         unregister_netdevice_queue(dev, head);
1457
1458         for (prio = 0; prio < 4; prio++) {
1459                 int h;
1460                 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1461                         struct ip6_tnl *t;
1462
1463                         t = rtnl_dereference(ign->tunnels[prio][h]);
1464
1465                         while (t) {
1466                                 /* If dev is in the same netns, it has already
1467                                  * been added to the list by the previous loop.
1468                                  */
1469                                 if (!net_eq(dev_net(t->dev), net))
1470                                         unregister_netdevice_queue(t->dev,
1471                                                                    head);
1472                                 t = rtnl_dereference(t->next);
1473                         }
1474                 }
1475         }
1476 }
1477
1478 static int __net_init ip6gre_init_net(struct net *net)
1479 {
1480         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1481         int err;
1482
1483         if (!net_has_fallback_tunnels(net))
1484                 return 0;
1485         ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1486                                           NET_NAME_UNKNOWN,
1487                                           ip6gre_tunnel_setup);
1488         if (!ign->fb_tunnel_dev) {
1489                 err = -ENOMEM;
1490                 goto err_alloc_dev;
1491         }
1492         dev_net_set(ign->fb_tunnel_dev, net);
1493         /* FB netdevice is special: we have one, and only one per netns.
1494          * Allowing to move it to another netns is clearly unsafe.
1495          */
1496         ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1497
1498
1499         ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1500         ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1501
1502         err = register_netdev(ign->fb_tunnel_dev);
1503         if (err)
1504                 goto err_reg_dev;
1505
1506         rcu_assign_pointer(ign->tunnels_wc[0],
1507                            netdev_priv(ign->fb_tunnel_dev));
1508         return 0;
1509
1510 err_reg_dev:
1511         free_netdev(ign->fb_tunnel_dev);
1512 err_alloc_dev:
1513         return err;
1514 }
1515
1516 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1517 {
1518         struct net *net;
1519         LIST_HEAD(list);
1520
1521         rtnl_lock();
1522         list_for_each_entry(net, net_list, exit_list)
1523                 ip6gre_destroy_tunnels(net, &list);
1524         unregister_netdevice_many(&list);
1525         rtnl_unlock();
1526 }
1527
1528 static struct pernet_operations ip6gre_net_ops = {
1529         .init = ip6gre_init_net,
1530         .exit_batch = ip6gre_exit_batch_net,
1531         .id   = &ip6gre_net_id,
1532         .size = sizeof(struct ip6gre_net),
1533 };
1534
1535 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1536                                   struct netlink_ext_ack *extack)
1537 {
1538         __be16 flags;
1539
1540         if (!data)
1541                 return 0;
1542
1543         flags = 0;
1544         if (data[IFLA_GRE_IFLAGS])
1545                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1546         if (data[IFLA_GRE_OFLAGS])
1547                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1548         if (flags & (GRE_VERSION|GRE_ROUTING))
1549                 return -EINVAL;
1550
1551         return 0;
1552 }
1553
1554 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1555                                struct netlink_ext_ack *extack)
1556 {
1557         struct in6_addr daddr;
1558
1559         if (tb[IFLA_ADDRESS]) {
1560                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1561                         return -EINVAL;
1562                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1563                         return -EADDRNOTAVAIL;
1564         }
1565
1566         if (!data)
1567                 goto out;
1568
1569         if (data[IFLA_GRE_REMOTE]) {
1570                 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1571                 if (ipv6_addr_any(&daddr))
1572                         return -EINVAL;
1573         }
1574
1575 out:
1576         return ip6gre_tunnel_validate(tb, data, extack);
1577 }
1578
1579 static int ip6erspan_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1580                                   struct netlink_ext_ack *extack)
1581 {
1582         __be16 flags = 0;
1583         int ret, ver = 0;
1584
1585         if (!data)
1586                 return 0;
1587
1588         ret = ip6gre_tap_validate(tb, data, extack);
1589         if (ret)
1590                 return ret;
1591
1592         /* ERSPAN should only have GRE sequence and key flag */
1593         if (data[IFLA_GRE_OFLAGS])
1594                 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1595         if (data[IFLA_GRE_IFLAGS])
1596                 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1597         if (!data[IFLA_GRE_COLLECT_METADATA] &&
1598             flags != (GRE_SEQ | GRE_KEY))
1599                 return -EINVAL;
1600
1601         /* ERSPAN Session ID only has 10-bit. Since we reuse
1602          * 32-bit key field as ID, check it's range.
1603          */
1604         if (data[IFLA_GRE_IKEY] &&
1605             (ntohl(nla_get_be32(data[IFLA_GRE_IKEY])) & ~ID_MASK))
1606                 return -EINVAL;
1607
1608         if (data[IFLA_GRE_OKEY] &&
1609             (ntohl(nla_get_be32(data[IFLA_GRE_OKEY])) & ~ID_MASK))
1610                 return -EINVAL;
1611
1612         if (data[IFLA_GRE_ERSPAN_VER]) {
1613                 ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1614                 if (ver != 1 && ver != 2)
1615                         return -EINVAL;
1616         }
1617
1618         if (ver == 1) {
1619                 if (data[IFLA_GRE_ERSPAN_INDEX]) {
1620                         u32 index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1621
1622                         if (index & ~INDEX_MASK)
1623                                 return -EINVAL;
1624                 }
1625         } else if (ver == 2) {
1626                 if (data[IFLA_GRE_ERSPAN_DIR]) {
1627                         u16 dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1628
1629                         if (dir & ~(DIR_MASK >> DIR_OFFSET))
1630                                 return -EINVAL;
1631                 }
1632
1633                 if (data[IFLA_GRE_ERSPAN_HWID]) {
1634                         u16 hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1635
1636                         if (hwid & ~(HWID_MASK >> HWID_OFFSET))
1637                                 return -EINVAL;
1638                 }
1639         }
1640
1641         return 0;
1642 }
1643
1644 static void ip6gre_netlink_parms(struct nlattr *data[],
1645                                 struct __ip6_tnl_parm *parms)
1646 {
1647         memset(parms, 0, sizeof(*parms));
1648
1649         if (!data)
1650                 return;
1651
1652         if (data[IFLA_GRE_LINK])
1653                 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1654
1655         if (data[IFLA_GRE_IFLAGS])
1656                 parms->i_flags = gre_flags_to_tnl_flags(
1657                                 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1658
1659         if (data[IFLA_GRE_OFLAGS])
1660                 parms->o_flags = gre_flags_to_tnl_flags(
1661                                 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1662
1663         if (data[IFLA_GRE_IKEY])
1664                 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1665
1666         if (data[IFLA_GRE_OKEY])
1667                 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1668
1669         if (data[IFLA_GRE_LOCAL])
1670                 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1671
1672         if (data[IFLA_GRE_REMOTE])
1673                 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1674
1675         if (data[IFLA_GRE_TTL])
1676                 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1677
1678         if (data[IFLA_GRE_ENCAP_LIMIT])
1679                 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1680
1681         if (data[IFLA_GRE_FLOWINFO])
1682                 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1683
1684         if (data[IFLA_GRE_FLAGS])
1685                 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1686
1687         if (data[IFLA_GRE_FWMARK])
1688                 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1689
1690         if (data[IFLA_GRE_COLLECT_METADATA])
1691                 parms->collect_md = true;
1692
1693         if (data[IFLA_GRE_ERSPAN_VER])
1694                 parms->erspan_ver = nla_get_u8(data[IFLA_GRE_ERSPAN_VER]);
1695
1696         if (parms->erspan_ver == 1) {
1697                 if (data[IFLA_GRE_ERSPAN_INDEX])
1698                         parms->index = nla_get_u32(data[IFLA_GRE_ERSPAN_INDEX]);
1699         } else if (parms->erspan_ver == 2) {
1700                 if (data[IFLA_GRE_ERSPAN_DIR])
1701                         parms->dir = nla_get_u8(data[IFLA_GRE_ERSPAN_DIR]);
1702                 if (data[IFLA_GRE_ERSPAN_HWID])
1703                         parms->hwid = nla_get_u16(data[IFLA_GRE_ERSPAN_HWID]);
1704         }
1705 }
1706
1707 static int ip6gre_tap_init(struct net_device *dev)
1708 {
1709         int ret;
1710
1711         ret = ip6gre_tunnel_init_common(dev);
1712         if (ret)
1713                 return ret;
1714
1715         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1716
1717         return 0;
1718 }
1719
1720 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1721         .ndo_init = ip6gre_tap_init,
1722         .ndo_uninit = ip6gre_tunnel_uninit,
1723         .ndo_start_xmit = ip6gre_tunnel_xmit,
1724         .ndo_set_mac_address = eth_mac_addr,
1725         .ndo_validate_addr = eth_validate_addr,
1726         .ndo_change_mtu = ip6_tnl_change_mtu,
1727         .ndo_get_stats64 = ip_tunnel_get_stats64,
1728         .ndo_get_iflink = ip6_tnl_get_iflink,
1729 };
1730
1731 static int ip6erspan_tap_init(struct net_device *dev)
1732 {
1733         struct ip6_tnl *tunnel;
1734         int t_hlen;
1735         int ret;
1736
1737         tunnel = netdev_priv(dev);
1738
1739         tunnel->dev = dev;
1740         tunnel->net = dev_net(dev);
1741         strcpy(tunnel->parms.name, dev->name);
1742
1743         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1744         if (!dev->tstats)
1745                 return -ENOMEM;
1746
1747         ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1748         if (ret) {
1749                 free_percpu(dev->tstats);
1750                 dev->tstats = NULL;
1751                 return ret;
1752         }
1753
1754         tunnel->tun_hlen = 8;
1755         tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
1756                        erspan_hdr_len(tunnel->parms.erspan_ver);
1757         t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1758
1759         dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1760         dev->mtu = ETH_DATA_LEN - t_hlen;
1761         if (dev->type == ARPHRD_ETHER)
1762                 dev->mtu -= ETH_HLEN;
1763         if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1764                 dev->mtu -= 8;
1765
1766         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1767         ip6gre_tnl_link_config(tunnel, 1);
1768
1769         return 0;
1770 }
1771
1772 static const struct net_device_ops ip6erspan_netdev_ops = {
1773         .ndo_init =             ip6erspan_tap_init,
1774         .ndo_uninit =           ip6gre_tunnel_uninit,
1775         .ndo_start_xmit =       ip6erspan_tunnel_xmit,
1776         .ndo_set_mac_address =  eth_mac_addr,
1777         .ndo_validate_addr =    eth_validate_addr,
1778         .ndo_change_mtu =       ip6_tnl_change_mtu,
1779         .ndo_get_stats64 =      ip_tunnel_get_stats64,
1780         .ndo_get_iflink =       ip6_tnl_get_iflink,
1781 };
1782
1783 static void ip6gre_tap_setup(struct net_device *dev)
1784 {
1785
1786         ether_setup(dev);
1787
1788         dev->max_mtu = 0;
1789         dev->netdev_ops = &ip6gre_tap_netdev_ops;
1790         dev->needs_free_netdev = true;
1791         dev->priv_destructor = ip6gre_dev_free;
1792
1793         dev->features |= NETIF_F_NETNS_LOCAL;
1794         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1795         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1796         netif_keep_dst(dev);
1797 }
1798
1799 bool is_ip6gretap_dev(const struct net_device *dev)
1800 {
1801         return dev->netdev_ops == &ip6gre_tap_netdev_ops;
1802 }
1803 EXPORT_SYMBOL_GPL(is_ip6gretap_dev);
1804
1805 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1806                                        struct ip_tunnel_encap *ipencap)
1807 {
1808         bool ret = false;
1809
1810         memset(ipencap, 0, sizeof(*ipencap));
1811
1812         if (!data)
1813                 return ret;
1814
1815         if (data[IFLA_GRE_ENCAP_TYPE]) {
1816                 ret = true;
1817                 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1818         }
1819
1820         if (data[IFLA_GRE_ENCAP_FLAGS]) {
1821                 ret = true;
1822                 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1823         }
1824
1825         if (data[IFLA_GRE_ENCAP_SPORT]) {
1826                 ret = true;
1827                 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1828         }
1829
1830         if (data[IFLA_GRE_ENCAP_DPORT]) {
1831                 ret = true;
1832                 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1833         }
1834
1835         return ret;
1836 }
1837
1838 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1839                           struct nlattr *tb[], struct nlattr *data[],
1840                           struct netlink_ext_ack *extack)
1841 {
1842         struct ip6_tnl *nt;
1843         struct net *net = dev_net(dev);
1844         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1845         struct ip_tunnel_encap ipencap;
1846         int err;
1847
1848         nt = netdev_priv(dev);
1849
1850         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1851                 int err = ip6_tnl_encap_setup(nt, &ipencap);
1852
1853                 if (err < 0)
1854                         return err;
1855         }
1856
1857         ip6gre_netlink_parms(data, &nt->parms);
1858
1859         if (nt->parms.collect_md) {
1860                 if (rtnl_dereference(ign->collect_md_tun))
1861                         return -EEXIST;
1862         } else {
1863                 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1864                         return -EEXIST;
1865         }
1866
1867         if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1868                 eth_hw_addr_random(dev);
1869
1870         nt->dev = dev;
1871         nt->net = dev_net(dev);
1872
1873         err = register_netdevice(dev);
1874         if (err)
1875                 goto out;
1876
1877         ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1878
1879         if (tb[IFLA_MTU])
1880                 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
1881
1882         dev_hold(dev);
1883         ip6gre_tunnel_link(ign, nt);
1884
1885 out:
1886         return err;
1887 }
1888
1889 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1890                              struct nlattr *data[],
1891                              struct netlink_ext_ack *extack)
1892 {
1893         struct ip6_tnl *t, *nt = netdev_priv(dev);
1894         struct net *net = nt->net;
1895         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1896         struct __ip6_tnl_parm p;
1897         struct ip_tunnel_encap ipencap;
1898
1899         if (dev == ign->fb_tunnel_dev)
1900                 return -EINVAL;
1901
1902         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1903                 int err = ip6_tnl_encap_setup(nt, &ipencap);
1904
1905                 if (err < 0)
1906                         return err;
1907         }
1908
1909         ip6gre_netlink_parms(data, &p);
1910
1911         t = ip6gre_tunnel_locate(net, &p, 0);
1912
1913         if (t) {
1914                 if (t->dev != dev)
1915                         return -EEXIST;
1916         } else {
1917                 t = nt;
1918         }
1919
1920         ip6gre_tunnel_unlink(ign, t);
1921         ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1922         ip6gre_tunnel_link(ign, t);
1923         return 0;
1924 }
1925
1926 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1927 {
1928         struct net *net = dev_net(dev);
1929         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1930
1931         if (dev != ign->fb_tunnel_dev)
1932                 unregister_netdevice_queue(dev, head);
1933 }
1934
1935 static size_t ip6gre_get_size(const struct net_device *dev)
1936 {
1937         return
1938                 /* IFLA_GRE_LINK */
1939                 nla_total_size(4) +
1940                 /* IFLA_GRE_IFLAGS */
1941                 nla_total_size(2) +
1942                 /* IFLA_GRE_OFLAGS */
1943                 nla_total_size(2) +
1944                 /* IFLA_GRE_IKEY */
1945                 nla_total_size(4) +
1946                 /* IFLA_GRE_OKEY */
1947                 nla_total_size(4) +
1948                 /* IFLA_GRE_LOCAL */
1949                 nla_total_size(sizeof(struct in6_addr)) +
1950                 /* IFLA_GRE_REMOTE */
1951                 nla_total_size(sizeof(struct in6_addr)) +
1952                 /* IFLA_GRE_TTL */
1953                 nla_total_size(1) +
1954                 /* IFLA_GRE_ENCAP_LIMIT */
1955                 nla_total_size(1) +
1956                 /* IFLA_GRE_FLOWINFO */
1957                 nla_total_size(4) +
1958                 /* IFLA_GRE_FLAGS */
1959                 nla_total_size(4) +
1960                 /* IFLA_GRE_ENCAP_TYPE */
1961                 nla_total_size(2) +
1962                 /* IFLA_GRE_ENCAP_FLAGS */
1963                 nla_total_size(2) +
1964                 /* IFLA_GRE_ENCAP_SPORT */
1965                 nla_total_size(2) +
1966                 /* IFLA_GRE_ENCAP_DPORT */
1967                 nla_total_size(2) +
1968                 /* IFLA_GRE_COLLECT_METADATA */
1969                 nla_total_size(0) +
1970                 /* IFLA_GRE_FWMARK */
1971                 nla_total_size(4) +
1972                 /* IFLA_GRE_ERSPAN_INDEX */
1973                 nla_total_size(4) +
1974                 0;
1975 }
1976
1977 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1978 {
1979         struct ip6_tnl *t = netdev_priv(dev);
1980         struct __ip6_tnl_parm *p = &t->parms;
1981
1982         if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1983             nla_put_be16(skb, IFLA_GRE_IFLAGS,
1984                          gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1985             nla_put_be16(skb, IFLA_GRE_OFLAGS,
1986                          gre_tnl_flags_to_gre_flags(p->o_flags)) ||
1987             nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1988             nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1989             nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1990             nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1991             nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1992             nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1993             nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1994             nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
1995             nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark) ||
1996             nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
1997                 goto nla_put_failure;
1998
1999         if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
2000                         t->encap.type) ||
2001             nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
2002                          t->encap.sport) ||
2003             nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
2004                          t->encap.dport) ||
2005             nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
2006                         t->encap.flags))
2007                 goto nla_put_failure;
2008
2009         if (p->collect_md) {
2010                 if (nla_put_flag(skb, IFLA_GRE_COLLECT_METADATA))
2011                         goto nla_put_failure;
2012         }
2013
2014         if (nla_put_u8(skb, IFLA_GRE_ERSPAN_VER, p->erspan_ver))
2015                 goto nla_put_failure;
2016
2017         if (p->erspan_ver == 1) {
2018                 if (nla_put_u32(skb, IFLA_GRE_ERSPAN_INDEX, p->index))
2019                         goto nla_put_failure;
2020         } else if (p->erspan_ver == 2) {
2021                 if (nla_put_u8(skb, IFLA_GRE_ERSPAN_DIR, p->dir))
2022                         goto nla_put_failure;
2023                 if (nla_put_u16(skb, IFLA_GRE_ERSPAN_HWID, p->hwid))
2024                         goto nla_put_failure;
2025         }
2026
2027         return 0;
2028
2029 nla_put_failure:
2030         return -EMSGSIZE;
2031 }
2032
2033 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
2034         [IFLA_GRE_LINK]        = { .type = NLA_U32 },
2035         [IFLA_GRE_IFLAGS]      = { .type = NLA_U16 },
2036         [IFLA_GRE_OFLAGS]      = { .type = NLA_U16 },
2037         [IFLA_GRE_IKEY]        = { .type = NLA_U32 },
2038         [IFLA_GRE_OKEY]        = { .type = NLA_U32 },
2039         [IFLA_GRE_LOCAL]       = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
2040         [IFLA_GRE_REMOTE]      = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
2041         [IFLA_GRE_TTL]         = { .type = NLA_U8 },
2042         [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
2043         [IFLA_GRE_FLOWINFO]    = { .type = NLA_U32 },
2044         [IFLA_GRE_FLAGS]       = { .type = NLA_U32 },
2045         [IFLA_GRE_ENCAP_TYPE]   = { .type = NLA_U16 },
2046         [IFLA_GRE_ENCAP_FLAGS]  = { .type = NLA_U16 },
2047         [IFLA_GRE_ENCAP_SPORT]  = { .type = NLA_U16 },
2048         [IFLA_GRE_ENCAP_DPORT]  = { .type = NLA_U16 },
2049         [IFLA_GRE_COLLECT_METADATA] = { .type = NLA_FLAG },
2050         [IFLA_GRE_FWMARK]       = { .type = NLA_U32 },
2051         [IFLA_GRE_ERSPAN_INDEX] = { .type = NLA_U32 },
2052         [IFLA_GRE_ERSPAN_VER]   = { .type = NLA_U8 },
2053         [IFLA_GRE_ERSPAN_DIR]   = { .type = NLA_U8 },
2054         [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
2055 };
2056
2057 static void ip6erspan_tap_setup(struct net_device *dev)
2058 {
2059         ether_setup(dev);
2060
2061         dev->netdev_ops = &ip6erspan_netdev_ops;
2062         dev->needs_free_netdev = true;
2063         dev->priv_destructor = ip6gre_dev_free;
2064
2065         dev->features |= NETIF_F_NETNS_LOCAL;
2066         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
2067         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2068         netif_keep_dst(dev);
2069 }
2070
2071 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
2072         .kind           = "ip6gre",
2073         .maxtype        = IFLA_GRE_MAX,
2074         .policy         = ip6gre_policy,
2075         .priv_size      = sizeof(struct ip6_tnl),
2076         .setup          = ip6gre_tunnel_setup,
2077         .validate       = ip6gre_tunnel_validate,
2078         .newlink        = ip6gre_newlink,
2079         .changelink     = ip6gre_changelink,
2080         .dellink        = ip6gre_dellink,
2081         .get_size       = ip6gre_get_size,
2082         .fill_info      = ip6gre_fill_info,
2083         .get_link_net   = ip6_tnl_get_link_net,
2084 };
2085
2086 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
2087         .kind           = "ip6gretap",
2088         .maxtype        = IFLA_GRE_MAX,
2089         .policy         = ip6gre_policy,
2090         .priv_size      = sizeof(struct ip6_tnl),
2091         .setup          = ip6gre_tap_setup,
2092         .validate       = ip6gre_tap_validate,
2093         .newlink        = ip6gre_newlink,
2094         .changelink     = ip6gre_changelink,
2095         .get_size       = ip6gre_get_size,
2096         .fill_info      = ip6gre_fill_info,
2097         .get_link_net   = ip6_tnl_get_link_net,
2098 };
2099
2100 static struct rtnl_link_ops ip6erspan_tap_ops __read_mostly = {
2101         .kind           = "ip6erspan",
2102         .maxtype        = IFLA_GRE_MAX,
2103         .policy         = ip6gre_policy,
2104         .priv_size      = sizeof(struct ip6_tnl),
2105         .setup          = ip6erspan_tap_setup,
2106         .validate       = ip6erspan_tap_validate,
2107         .newlink        = ip6gre_newlink,
2108         .changelink     = ip6gre_changelink,
2109         .get_size       = ip6gre_get_size,
2110         .fill_info      = ip6gre_fill_info,
2111         .get_link_net   = ip6_tnl_get_link_net,
2112 };
2113
2114 /*
2115  *      And now the modules code and kernel interface.
2116  */
2117
2118 static int __init ip6gre_init(void)
2119 {
2120         int err;
2121
2122         pr_info("GRE over IPv6 tunneling driver\n");
2123
2124         err = register_pernet_device(&ip6gre_net_ops);
2125         if (err < 0)
2126                 return err;
2127
2128         err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
2129         if (err < 0) {
2130                 pr_info("%s: can't add protocol\n", __func__);
2131                 goto add_proto_failed;
2132         }
2133
2134         err = rtnl_link_register(&ip6gre_link_ops);
2135         if (err < 0)
2136                 goto rtnl_link_failed;
2137
2138         err = rtnl_link_register(&ip6gre_tap_ops);
2139         if (err < 0)
2140                 goto tap_ops_failed;
2141
2142         err = rtnl_link_register(&ip6erspan_tap_ops);
2143         if (err < 0)
2144                 goto erspan_link_failed;
2145
2146 out:
2147         return err;
2148
2149 erspan_link_failed:
2150         rtnl_link_unregister(&ip6gre_tap_ops);
2151 tap_ops_failed:
2152         rtnl_link_unregister(&ip6gre_link_ops);
2153 rtnl_link_failed:
2154         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2155 add_proto_failed:
2156         unregister_pernet_device(&ip6gre_net_ops);
2157         goto out;
2158 }
2159
2160 static void __exit ip6gre_fini(void)
2161 {
2162         rtnl_link_unregister(&ip6gre_tap_ops);
2163         rtnl_link_unregister(&ip6gre_link_ops);
2164         rtnl_link_unregister(&ip6erspan_tap_ops);
2165         inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
2166         unregister_pernet_device(&ip6gre_net_ops);
2167 }
2168
2169 module_init(ip6gre_init);
2170 module_exit(ip6gre_fini);
2171 MODULE_LICENSE("GPL");
2172 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
2173 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
2174 MODULE_ALIAS_RTNL_LINK("ip6gre");
2175 MODULE_ALIAS_RTNL_LINK("ip6gretap");
2176 MODULE_ALIAS_RTNL_LINK("ip6erspan");
2177 MODULE_ALIAS_NETDEV("ip6gre0");