net/ipv6/ip6

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This source file includes following definitions.
HASH
vti6_tnl_lookup
vti6_tnl_bucket
vti6_tnl_link
vti6_tnl_unlink
vti6_dev_free
vti6_tnl_create2
vti6_tnl_create
vti6_locate
vti6_dev_uninit
vti6_rcv
vti6_rcv_cb
vti6_addr_conflict
vti6_state_check
vti6_xmit
vti6_tnl_xmit
vti6_err
vti6_link_config
vti6_tnl_change
vti6_update
vti6_parm_from_user
vti6_parm_to_user
vti6_ioctl
vti6_dev_setup
vti6_dev_init_gen
vti6_dev_init
vti6_fb_tnl_dev_init
vti6_validate
vti6_netlink_parms
vti6_newlink
vti6_dellink
vti6_changelink
vti6_get_size
vti6_fill_info
vti6_destroy_tunnels
vti6_init_net
vti6_exit_batch_net
vti6_tunnel_init
vti6_tunnel_cleanup
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *      IPv6 virtual tunneling interface
   4  *
   5  *      Copyright (C) 2013 secunet Security Networks AG
   6  *
   7  *      Author:
   8  *      Steffen Klassert <steffen.klassert@secunet.com>
   9  *
  10  *      Based on:
  11  *      net/ipv6/ip6_tunnel.c
  12  */
  13 
  14 #include <linux/module.h>
  15 #include <linux/capability.h>
  16 #include <linux/errno.h>
  17 #include <linux/types.h>
  18 #include <linux/sockios.h>
  19 #include <linux/icmp.h>
  20 #include <linux/if.h>
  21 #include <linux/in.h>
  22 #include <linux/ip.h>
  23 #include <linux/net.h>
  24 #include <linux/in6.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/if_arp.h>
  27 #include <linux/icmpv6.h>
  28 #include <linux/init.h>
  29 #include <linux/route.h>
  30 #include <linux/rtnetlink.h>
  31 #include <linux/netfilter_ipv6.h>
  32 #include <linux/slab.h>
  33 #include <linux/hash.h>
  34 
  35 #include <linux/uaccess.h>
  36 #include <linux/atomic.h>
  37 
  38 #include <net/icmp.h>
  39 #include <net/ip.h>
  40 #include <net/ip_tunnels.h>
  41 #include <net/ipv6.h>
  42 #include <net/ip6_route.h>
  43 #include <net/addrconf.h>
  44 #include <net/ip6_tunnel.h>
  45 #include <net/xfrm.h>
  46 #include <net/net_namespace.h>
  47 #include <net/netns/generic.h>
  48 #include <linux/etherdevice.h>
  49 
  50 #define IP6_VTI_HASH_SIZE_SHIFT  5
  51 #define IP6_VTI_HASH_SIZE (1 << IP6_VTI_HASH_SIZE_SHIFT)
  52 
  53 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
  54 {
  55         u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
  56 
  57         return hash_32(hash, IP6_VTI_HASH_SIZE_SHIFT);
  58 }
  59 
  60 static int vti6_dev_init(struct net_device *dev);
  61 static void vti6_dev_setup(struct net_device *dev);
  62 static struct rtnl_link_ops vti6_link_ops __read_mostly;
  63 
  64 static unsigned int vti6_net_id __read_mostly;
  65 struct vti6_net {
  66         /* the vti6 tunnel fallback device */
  67         struct net_device *fb_tnl_dev;
  68         /* lists for storing tunnels in use */
  69         struct ip6_tnl __rcu *tnls_r_l[IP6_VTI_HASH_SIZE];
  70         struct ip6_tnl __rcu *tnls_wc[1];
  71         struct ip6_tnl __rcu **tnls[2];
  72 };
  73 
  74 #define for_each_vti6_tunnel_rcu(start) \
  75         for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
  76 
  77 /**
  78  * vti6_tnl_lookup - fetch tunnel matching the end-point addresses
  79  *   @net: network namespace
  80  *   @remote: the address of the tunnel exit-point
  81  *   @local: the address of the tunnel entry-point
  82  *
  83  * Return:
  84  *   tunnel matching given end-points if found,
  85  *   else fallback tunnel if its device is up,
  86  *   else %NULL
  87  **/
  88 static struct ip6_tnl *
  89 vti6_tnl_lookup(struct net *net, const struct in6_addr *remote,
  90                 const struct in6_addr *local)
  91 {
  92         unsigned int hash = HASH(remote, local);
  93         struct ip6_tnl *t;
  94         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
  95         struct in6_addr any;
  96 
  97         for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
  98                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
  99                     ipv6_addr_equal(remote, &t->parms.raddr) &&
 100                     (t->dev->flags & IFF_UP))
 101                         return t;
 102         }
 103 
 104         memset(&any, 0, sizeof(any));
 105         hash = HASH(&any, local);
 106         for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
 107                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
 108                     (t->dev->flags & IFF_UP))
 109                         return t;
 110         }
 111 
 112         hash = HASH(remote, &any);
 113         for_each_vti6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
 114                 if (ipv6_addr_equal(remote, &t->parms.raddr) &&
 115                     (t->dev->flags & IFF_UP))
 116                         return t;
 117         }
 118 
 119         t = rcu_dereference(ip6n->tnls_wc[0]);
 120         if (t && (t->dev->flags & IFF_UP))
 121                 return t;
 122 
 123         return NULL;
 124 }
 125 
 126 /**
 127  * vti6_tnl_bucket - get head of list matching given tunnel parameters
 128  *   @p: parameters containing tunnel end-points
 129  *
 130  * Description:
 131  *   vti6_tnl_bucket() returns the head of the list matching the
 132  *   &struct in6_addr entries laddr and raddr in @p.
 133  *
 134  * Return: head of IPv6 tunnel list
 135  **/
 136 static struct ip6_tnl __rcu **
 137 vti6_tnl_bucket(struct vti6_net *ip6n, const struct __ip6_tnl_parm *p)
 138 {
 139         const struct in6_addr *remote = &p->raddr;
 140         const struct in6_addr *local = &p->laddr;
 141         unsigned int h = 0;
 142         int prio = 0;
 143 
 144         if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
 145                 prio = 1;
 146                 h = HASH(remote, local);
 147         }
 148         return &ip6n->tnls[prio][h];
 149 }
 150 
 151 static void
 152 vti6_tnl_link(struct vti6_net *ip6n, struct ip6_tnl *t)
 153 {
 154         struct ip6_tnl __rcu **tp = vti6_tnl_bucket(ip6n, &t->parms);
 155 
 156         rcu_assign_pointer(t->next , rtnl_dereference(*tp));
 157         rcu_assign_pointer(*tp, t);
 158 }
 159 
 160 static void
 161 vti6_tnl_unlink(struct vti6_net *ip6n, struct ip6_tnl *t)
 162 {
 163         struct ip6_tnl __rcu **tp;
 164         struct ip6_tnl *iter;
 165 
 166         for (tp = vti6_tnl_bucket(ip6n, &t->parms);
 167              (iter = rtnl_dereference(*tp)) != NULL;
 168              tp = &iter->next) {
 169                 if (t == iter) {
 170                         rcu_assign_pointer(*tp, t->next);
 171                         break;
 172                 }
 173         }
 174 }
 175 
 176 static void vti6_dev_free(struct net_device *dev)
 177 {
 178         free_percpu(dev->tstats);
 179 }
 180 
 181 static int vti6_tnl_create2(struct net_device *dev)
 182 {
 183         struct ip6_tnl *t = netdev_priv(dev);
 184         struct net *net = dev_net(dev);
 185         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
 186         int err;
 187 
 188         dev->rtnl_link_ops = &vti6_link_ops;
 189         err = register_netdevice(dev);
 190         if (err < 0)
 191                 goto out;
 192 
 193         strcpy(t->parms.name, dev->name);
 194 
 195         dev_hold(dev);
 196         vti6_tnl_link(ip6n, t);
 197 
 198         return 0;
 199 
 200 out:
 201         return err;
 202 }
 203 
 204 static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
 205 {
 206         struct net_device *dev;
 207         struct ip6_tnl *t;
 208         char name[IFNAMSIZ];
 209         int err;
 210 
 211         if (p->name[0]) {
 212                 if (!dev_valid_name(p->name))
 213                         goto failed;
 214                 strlcpy(name, p->name, IFNAMSIZ);
 215         } else {
 216                 sprintf(name, "ip6_vti%%d");
 217         }
 218 
 219         dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
 220         if (!dev)
 221                 goto failed;
 222 
 223         dev_net_set(dev, net);
 224 
 225         t = netdev_priv(dev);
 226         t->parms = *p;
 227         t->net = dev_net(dev);
 228 
 229         err = vti6_tnl_create2(dev);
 230         if (err < 0)
 231                 goto failed_free;
 232 
 233         return t;
 234 
 235 failed_free:
 236         free_netdev(dev);
 237 failed:
 238         return NULL;
 239 }
 240 
 241 /**
 242  * vti6_locate - find or create tunnel matching given parameters
 243  *   @net: network namespace
 244  *   @p: tunnel parameters
 245  *   @create: != 0 if allowed to create new tunnel if no match found
 246  *
 247  * Description:
 248  *   vti6_locate() first tries to locate an existing tunnel
 249  *   based on @parms. If this is unsuccessful, but @create is set a new
 250  *   tunnel device is created and registered for use.
 251  *
 252  * Return:
 253  *   matching tunnel or NULL
 254  **/
 255 static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
 256                                    int create)
 257 {
 258         const struct in6_addr *remote = &p->raddr;
 259         const struct in6_addr *local = &p->laddr;
 260         struct ip6_tnl __rcu **tp;
 261         struct ip6_tnl *t;
 262         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
 263 
 264         for (tp = vti6_tnl_bucket(ip6n, p);
 265              (t = rtnl_dereference(*tp)) != NULL;
 266              tp = &t->next) {
 267                 if (ipv6_addr_equal(local, &t->parms.laddr) &&
 268                     ipv6_addr_equal(remote, &t->parms.raddr)) {
 269                         if (create)
 270                                 return NULL;
 271 
 272                         return t;
 273                 }
 274         }
 275         if (!create)
 276                 return NULL;
 277         return vti6_tnl_create(net, p);
 278 }
 279 
 280 /**
 281  * vti6_dev_uninit - tunnel device uninitializer
 282  *   @dev: the device to be destroyed
 283  *
 284  * Description:
 285  *   vti6_dev_uninit() removes tunnel from its list
 286  **/
 287 static void vti6_dev_uninit(struct net_device *dev)
 288 {
 289         struct ip6_tnl *t = netdev_priv(dev);
 290         struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
 291 
 292         if (dev == ip6n->fb_tnl_dev)
 293                 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
 294         else
 295                 vti6_tnl_unlink(ip6n, t);
 296         dev_put(dev);
 297 }
 298 
 299 static int vti6_rcv(struct sk_buff *skb)
 300 {
 301         struct ip6_tnl *t;
 302         const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
 303 
 304         rcu_read_lock();
 305         t = vti6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
 306         if (t) {
 307                 if (t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) {
 308                         rcu_read_unlock();
 309                         goto discard;
 310                 }
 311 
 312                 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
 313                         rcu_read_unlock();
 314                         goto discard;
 315                 }
 316 
 317                 ipv6h = ipv6_hdr(skb);
 318                 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) {
 319                         t->dev->stats.rx_dropped++;
 320                         rcu_read_unlock();
 321                         goto discard;
 322                 }
 323 
 324                 rcu_read_unlock();
 325 
 326                 return xfrm6_rcv_tnl(skb, t);
 327         }
 328         rcu_read_unlock();
 329         return -EINVAL;
 330 discard:
 331         kfree_skb(skb);
 332         return 0;
 333 }
 334 
 335 static int vti6_rcv_cb(struct sk_buff *skb, int err)
 336 {
 337         unsigned short family;
 338         struct net_device *dev;
 339         struct pcpu_sw_netstats *tstats;
 340         struct xfrm_state *x;
 341         const struct xfrm_mode *inner_mode;
 342         struct ip6_tnl *t = XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6;
 343         u32 orig_mark = skb->mark;
 344         int ret;
 345 
 346         if (!t)
 347                 return 1;
 348 
 349         dev = t->dev;
 350 
 351         if (err) {
 352                 dev->stats.rx_errors++;
 353                 dev->stats.rx_dropped++;
 354 
 355                 return 0;
 356         }
 357 
 358         x = xfrm_input_state(skb);
 359 
 360         inner_mode = &x->inner_mode;
 361 
 362         if (x->sel.family == AF_UNSPEC) {
 363                 inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
 364                 if (inner_mode == NULL) {
 365                         XFRM_INC_STATS(dev_net(skb->dev),
 366                                        LINUX_MIB_XFRMINSTATEMODEERROR);
 367                         return -EINVAL;
 368                 }
 369         }
 370 
 371         family = inner_mode->family;
 372 
 373         skb->mark = be32_to_cpu(t->parms.i_key);
 374         ret = xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, family);
 375         skb->mark = orig_mark;
 376 
 377         if (!ret)
 378                 return -EPERM;
 379 
 380         skb_scrub_packet(skb, !net_eq(t->net, dev_net(skb->dev)));
 381         skb->dev = dev;
 382 
 383         tstats = this_cpu_ptr(dev->tstats);
 384         u64_stats_update_begin(&tstats->syncp);
 385         tstats->rx_packets++;
 386         tstats->rx_bytes += skb->len;
 387         u64_stats_update_end(&tstats->syncp);
 388 
 389         return 0;
 390 }
 391 
 392 /**
 393  * vti6_addr_conflict - compare packet addresses to tunnel's own
 394  *   @t: the outgoing tunnel device
 395  *   @hdr: IPv6 header from the incoming packet
 396  *
 397  * Description:
 398  *   Avoid trivial tunneling loop by checking that tunnel exit-point
 399  *   doesn't match source of incoming packet.
 400  *
 401  * Return:
 402  *   1 if conflict,
 403  *   0 else
 404  **/
 405 static inline bool
 406 vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
 407 {
 408         return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
 409 }
 410 
 411 static bool vti6_state_check(const struct xfrm_state *x,
 412                              const struct in6_addr *dst,
 413                              const struct in6_addr *src)
 414 {
 415         xfrm_address_t *daddr = (xfrm_address_t *)dst;
 416         xfrm_address_t *saddr = (xfrm_address_t *)src;
 417 
 418         /* if there is no transform then this tunnel is not functional.
 419          * Or if the xfrm is not mode tunnel.
 420          */
 421         if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
 422             x->props.family != AF_INET6)
 423                 return false;
 424 
 425         if (ipv6_addr_any(dst))
 426                 return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
 427 
 428         if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
 429                 return false;
 430 
 431         return true;
 432 }
 433 
 434 /**
 435  * vti6_xmit - send a packet
 436  *   @skb: the outgoing socket buffer
 437  *   @dev: the outgoing tunnel device
 438  *   @fl: the flow informations for the xfrm_lookup
 439  **/
 440 static int
 441 vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
 442 {
 443         struct ip6_tnl *t = netdev_priv(dev);
 444         struct net_device_stats *stats = &t->dev->stats;
 445         struct dst_entry *dst = skb_dst(skb);
 446         struct net_device *tdev;
 447         struct xfrm_state *x;
 448         int pkt_len = skb->len;
 449         int err = -1;
 450         int mtu;
 451 
 452         if (!dst) {
 453                 switch (skb->protocol) {
 454                 case htons(ETH_P_IP): {
 455                         struct rtable *rt;
 456 
 457                         fl->u.ip4.flowi4_oif = dev->ifindex;
 458                         fl->u.ip4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
 459                         rt = __ip_route_output_key(dev_net(dev), &fl->u.ip4);
 460                         if (IS_ERR(rt))
 461                                 goto tx_err_link_failure;
 462                         dst = &rt->dst;
 463                         skb_dst_set(skb, dst);
 464                         break;
 465                 }
 466                 case htons(ETH_P_IPV6):
 467                         fl->u.ip6.flowi6_oif = dev->ifindex;
 468                         fl->u.ip6.flowi6_flags |= FLOWI_FLAG_ANYSRC;
 469                         dst = ip6_route_output(dev_net(dev), NULL, &fl->u.ip6);
 470                         if (dst->error) {
 471                                 dst_release(dst);
 472                                 dst = NULL;
 473                                 goto tx_err_link_failure;
 474                         }
 475                         skb_dst_set(skb, dst);
 476                         break;
 477                 default:
 478                         goto tx_err_link_failure;
 479                 }
 480         }
 481 
 482         dst_hold(dst);
 483         dst = xfrm_lookup(t->net, dst, fl, NULL, 0);
 484         if (IS_ERR(dst)) {
 485                 err = PTR_ERR(dst);
 486                 dst = NULL;
 487                 goto tx_err_link_failure;
 488         }
 489 
 490         x = dst->xfrm;
 491         if (!vti6_state_check(x, &t->parms.raddr, &t->parms.laddr))
 492                 goto tx_err_link_failure;
 493 
 494         if (!ip6_tnl_xmit_ctl(t, (const struct in6_addr *)&x->props.saddr,
 495                               (const struct in6_addr *)&x->id.daddr))
 496                 goto tx_err_link_failure;
 497 
 498         tdev = dst->dev;
 499 
 500         if (tdev == dev) {
 501                 stats->collisions++;
 502                 net_warn_ratelimited("%s: Local routing loop detected!\n",
 503                                      t->parms.name);
 504                 goto tx_err_dst_release;
 505         }
 506 
 507         mtu = dst_mtu(dst);
 508         if (skb->len > mtu) {
 509                 skb_dst_update_pmtu_no_confirm(skb, mtu);
 510 
 511                 if (skb->protocol == htons(ETH_P_IPV6)) {
 512                         if (mtu < IPV6_MIN_MTU)
 513                                 mtu = IPV6_MIN_MTU;
 514 
 515                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
 516                 } else {
 517                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
 518                                   htonl(mtu));
 519                 }
 520 
 521                 err = -EMSGSIZE;
 522                 goto tx_err_dst_release;
 523         }
 524 
 525         skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
 526         skb_dst_set(skb, dst);
 527         skb->dev = skb_dst(skb)->dev;
 528 
 529         err = dst_output(t->net, skb->sk, skb);
 530         if (net_xmit_eval(err) == 0)
 531                 err = pkt_len;
 532         iptunnel_xmit_stats(dev, err);
 533 
 534         return 0;
 535 tx_err_link_failure:
 536         stats->tx_carrier_errors++;
 537         dst_link_failure(skb);
 538 tx_err_dst_release:
 539         dst_release(dst);
 540         return err;
 541 }
 542 
 543 static netdev_tx_t
 544 vti6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
 545 {
 546         struct ip6_tnl *t = netdev_priv(dev);
 547         struct net_device_stats *stats = &t->dev->stats;
 548         struct flowi fl;
 549         int ret;
 550 
 551         if (!pskb_inet_may_pull(skb))
 552                 goto tx_err;
 553 
 554         memset(&fl, 0, sizeof(fl));
 555 
 556         switch (skb->protocol) {
 557         case htons(ETH_P_IPV6):
 558                 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) ||
 559                     vti6_addr_conflict(t, ipv6_hdr(skb)))
 560                         goto tx_err;
 561 
 562                 xfrm_decode_session(skb, &fl, AF_INET6);
 563                 memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
 564                 break;
 565         case htons(ETH_P_IP):
 566                 xfrm_decode_session(skb, &fl, AF_INET);
 567                 memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
 568                 break;
 569         default:
 570                 goto tx_err;
 571         }
 572 
 573         /* override mark with tunnel output key */
 574         fl.flowi_mark = be32_to_cpu(t->parms.o_key);
 575 
 576         ret = vti6_xmit(skb, dev, &fl);
 577         if (ret < 0)
 578                 goto tx_err;
 579 
 580         return NETDEV_TX_OK;
 581 
 582 tx_err:
 583         stats->tx_errors++;
 584         stats->tx_dropped++;
 585         kfree_skb(skb);
 586         return NETDEV_TX_OK;
 587 }
 588 
 589 static int vti6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 590                     u8 type, u8 code, int offset, __be32 info)
 591 {
 592         __be32 spi;
 593         __u32 mark;
 594         struct xfrm_state *x;
 595         struct ip6_tnl *t;
 596         struct ip_esp_hdr *esph;
 597         struct ip_auth_hdr *ah;
 598         struct ip_comp_hdr *ipch;
 599         struct net *net = dev_net(skb->dev);
 600         const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data;
 601         int protocol = iph->nexthdr;
 602 
 603         t = vti6_tnl_lookup(dev_net(skb->dev), &iph->daddr, &iph->saddr);
 604         if (!t)
 605                 return -1;
 606 
 607         mark = be32_to_cpu(t->parms.o_key);
 608 
 609         switch (protocol) {
 610         case IPPROTO_ESP:
 611                 esph = (struct ip_esp_hdr *)(skb->data + offset);
 612                 spi = esph->spi;
 613                 break;
 614         case IPPROTO_AH:
 615                 ah = (struct ip_auth_hdr *)(skb->data + offset);
 616                 spi = ah->spi;
 617                 break;
 618         case IPPROTO_COMP:
 619                 ipch = (struct ip_comp_hdr *)(skb->data + offset);
 620                 spi = htonl(ntohs(ipch->cpi));
 621                 break;
 622         default:
 623                 return 0;
 624         }
 625 
 626         if (type != ICMPV6_PKT_TOOBIG &&
 627             type != NDISC_REDIRECT)
 628                 return 0;
 629 
 630         x = xfrm_state_lookup(net, mark, (const xfrm_address_t *)&iph->daddr,
 631                               spi, protocol, AF_INET6);
 632         if (!x)
 633                 return 0;
 634 
 635         if (type == NDISC_REDIRECT)
 636                 ip6_redirect(skb, net, skb->dev->ifindex, 0,
 637                              sock_net_uid(net, NULL));
 638         else
 639                 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
 640         xfrm_state_put(x);
 641 
 642         return 0;
 643 }
 644 
 645 static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
 646 {
 647         struct net_device *dev = t->dev;
 648         struct __ip6_tnl_parm *p = &t->parms;
 649         struct net_device *tdev = NULL;
 650         int mtu;
 651 
 652         memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
 653         memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
 654 
 655         p->flags &= ~(IP6_TNL_F_CAP_XMIT | IP6_TNL_F_CAP_RCV |
 656                       IP6_TNL_F_CAP_PER_PACKET);
 657         p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
 658 
 659         if (p->flags & IP6_TNL_F_CAP_XMIT && p->flags & IP6_TNL_F_CAP_RCV)
 660                 dev->flags |= IFF_POINTOPOINT;
 661         else
 662                 dev->flags &= ~IFF_POINTOPOINT;
 663 
 664         if (keep_mtu && dev->mtu) {
 665                 dev->mtu = clamp(dev->mtu, dev->min_mtu, dev->max_mtu);
 666                 return;
 667         }
 668 
 669         if (p->flags & IP6_TNL_F_CAP_XMIT) {
 670                 int strict = (ipv6_addr_type(&p->raddr) &
 671                               (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
 672                 struct rt6_info *rt = rt6_lookup(t->net,
 673                                                  &p->raddr, &p->laddr,
 674                                                  p->link, NULL, strict);
 675 
 676                 if (rt)
 677                         tdev = rt->dst.dev;
 678                 ip6_rt_put(rt);
 679         }
 680 
 681         if (!tdev && p->link)
 682                 tdev = __dev_get_by_index(t->net, p->link);
 683 
 684         if (tdev)
 685                 mtu = tdev->mtu - sizeof(struct ipv6hdr);
 686         else
 687                 mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
 688 
 689         dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
 690 }
 691 
 692 /**
 693  * vti6_tnl_change - update the tunnel parameters
 694  *   @t: tunnel to be changed
 695  *   @p: tunnel configuration parameters
 696  *   @keep_mtu: MTU was set from userspace, don't re-compute it
 697  *
 698  * Description:
 699  *   vti6_tnl_change() updates the tunnel parameters
 700  **/
 701 static int
 702 vti6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p,
 703                 bool keep_mtu)
 704 {
 705         t->parms.laddr = p->laddr;
 706         t->parms.raddr = p->raddr;
 707         t->parms.link = p->link;
 708         t->parms.i_key = p->i_key;
 709         t->parms.o_key = p->o_key;
 710         t->parms.proto = p->proto;
 711         t->parms.fwmark = p->fwmark;
 712         dst_cache_reset(&t->dst_cache);
 713         vti6_link_config(t, keep_mtu);
 714         return 0;
 715 }
 716 
 717 static int vti6_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p,
 718                        bool keep_mtu)
 719 {
 720         struct net *net = dev_net(t->dev);
 721         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
 722         int err;
 723 
 724         vti6_tnl_unlink(ip6n, t);
 725         synchronize_net();
 726         err = vti6_tnl_change(t, p, keep_mtu);
 727         vti6_tnl_link(ip6n, t);
 728         netdev_state_change(t->dev);
 729         return err;
 730 }
 731 
 732 static void
 733 vti6_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm2 *u)
 734 {
 735         p->laddr = u->laddr;
 736         p->raddr = u->raddr;
 737         p->link = u->link;
 738         p->i_key = u->i_key;
 739         p->o_key = u->o_key;
 740         p->proto = u->proto;
 741 
 742         memcpy(p->name, u->name, sizeof(u->name));
 743 }
 744 
 745 static void
 746 vti6_parm_to_user(struct ip6_tnl_parm2 *u, const struct __ip6_tnl_parm *p)
 747 {
 748         u->laddr = p->laddr;
 749         u->raddr = p->raddr;
 750         u->link = p->link;
 751         u->i_key = p->i_key;
 752         u->o_key = p->o_key;
 753         if (u->i_key)
 754                 u->i_flags |= GRE_KEY;
 755         if (u->o_key)
 756                 u->o_flags |= GRE_KEY;
 757         u->proto = p->proto;
 758 
 759         memcpy(u->name, p->name, sizeof(u->name));
 760 }
 761 
 762 /**
 763  * vti6_ioctl - configure vti6 tunnels from userspace
 764  *   @dev: virtual device associated with tunnel
 765  *   @ifr: parameters passed from userspace
 766  *   @cmd: command to be performed
 767  *
 768  * Description:
 769  *   vti6_ioctl() is used for managing vti6 tunnels
 770  *   from userspace.
 771  *
 772  *   The possible commands are the following:
 773  *     %SIOCGETTUNNEL: get tunnel parameters for device
 774  *     %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
 775  *     %SIOCCHGTUNNEL: change tunnel parameters to those given
 776  *     %SIOCDELTUNNEL: delete tunnel
 777  *
 778  *   The fallback device "ip6_vti0", created during module
 779  *   initialization, can be used for creating other tunnel devices.
 780  *
 781  * Return:
 782  *   0 on success,
 783  *   %-EFAULT if unable to copy data to or from userspace,
 784  *   %-EPERM if current process hasn't %CAP_NET_ADMIN set
 785  *   %-EINVAL if passed tunnel parameters are invalid,
 786  *   %-EEXIST if changing a tunnel's parameters would cause a conflict
 787  *   %-ENODEV if attempting to change or delete a nonexisting device
 788  **/
 789 static int
 790 vti6_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 791 {
 792         int err = 0;
 793         struct ip6_tnl_parm2 p;
 794         struct __ip6_tnl_parm p1;
 795         struct ip6_tnl *t = NULL;
 796         struct net *net = dev_net(dev);
 797         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
 798 
 799         switch (cmd) {
 800         case SIOCGETTUNNEL:
 801                 if (dev == ip6n->fb_tnl_dev) {
 802                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
 803                                 err = -EFAULT;
 804                                 break;
 805                         }
 806                         vti6_parm_from_user(&p1, &p);
 807                         t = vti6_locate(net, &p1, 0);
 808                 } else {
 809                         memset(&p, 0, sizeof(p));
 810                 }
 811                 if (!t)
 812                         t = netdev_priv(dev);
 813                 vti6_parm_to_user(&p, &t->parms);
 814                 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
 815                         err = -EFAULT;
 816                 break;
 817         case SIOCADDTUNNEL:
 818         case SIOCCHGTUNNEL:
 819                 err = -EPERM;
 820                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 821                         break;
 822                 err = -EFAULT;
 823                 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
 824                         break;
 825                 err = -EINVAL;
 826                 if (p.proto != IPPROTO_IPV6  && p.proto != 0)
 827                         break;
 828                 vti6_parm_from_user(&p1, &p);
 829                 t = vti6_locate(net, &p1, cmd == SIOCADDTUNNEL);
 830                 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) {
 831                         if (t) {
 832                                 if (t->dev != dev) {
 833                                         err = -EEXIST;
 834                                         break;
 835                                 }
 836                         } else
 837                                 t = netdev_priv(dev);
 838 
 839                         err = vti6_update(t, &p1, false);
 840                 }
 841                 if (t) {
 842                         err = 0;
 843                         vti6_parm_to_user(&p, &t->parms);
 844                         if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
 845                                 err = -EFAULT;
 846 
 847                 } else
 848                         err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
 849                 break;
 850         case SIOCDELTUNNEL:
 851                 err = -EPERM;
 852                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 853                         break;
 854 
 855                 if (dev == ip6n->fb_tnl_dev) {
 856                         err = -EFAULT;
 857                         if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
 858                                 break;
 859                         err = -ENOENT;
 860                         vti6_parm_from_user(&p1, &p);
 861                         t = vti6_locate(net, &p1, 0);
 862                         if (!t)
 863                                 break;
 864                         err = -EPERM;
 865                         if (t->dev == ip6n->fb_tnl_dev)
 866                                 break;
 867                         dev = t->dev;
 868                 }
 869                 err = 0;
 870                 unregister_netdevice(dev);
 871                 break;
 872         default:
 873                 err = -EINVAL;
 874         }
 875         return err;
 876 }
 877 
 878 static const struct net_device_ops vti6_netdev_ops = {
 879         .ndo_init       = vti6_dev_init,
 880         .ndo_uninit     = vti6_dev_uninit,
 881         .ndo_start_xmit = vti6_tnl_xmit,
 882         .ndo_do_ioctl   = vti6_ioctl,
 883         .ndo_get_stats64 = ip_tunnel_get_stats64,
 884         .ndo_get_iflink = ip6_tnl_get_iflink,
 885 };
 886 
 887 /**
 888  * vti6_dev_setup - setup virtual tunnel device
 889  *   @dev: virtual device associated with tunnel
 890  *
 891  * Description:
 892  *   Initialize function pointers and device parameters
 893  **/
 894 static void vti6_dev_setup(struct net_device *dev)
 895 {
 896         dev->netdev_ops = &vti6_netdev_ops;
 897         dev->needs_free_netdev = true;
 898         dev->priv_destructor = vti6_dev_free;
 899 
 900         dev->type = ARPHRD_TUNNEL6;
 901         dev->min_mtu = IPV4_MIN_MTU;
 902         dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
 903         dev->flags |= IFF_NOARP;
 904         dev->addr_len = sizeof(struct in6_addr);
 905         netif_keep_dst(dev);
 906         /* This perm addr will be used as interface identifier by IPv6 */
 907         dev->addr_assign_type = NET_ADDR_RANDOM;
 908         eth_random_addr(dev->perm_addr);
 909 }
 910 
 911 /**
 912  * vti6_dev_init_gen - general initializer for all tunnel devices
 913  *   @dev: virtual device associated with tunnel
 914  **/
 915 static inline int vti6_dev_init_gen(struct net_device *dev)
 916 {
 917         struct ip6_tnl *t = netdev_priv(dev);
 918 
 919         t->dev = dev;
 920         t->net = dev_net(dev);
 921         dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
 922         if (!dev->tstats)
 923                 return -ENOMEM;
 924         return 0;
 925 }
 926 
 927 /**
 928  * vti6_dev_init - initializer for all non fallback tunnel devices
 929  *   @dev: virtual device associated with tunnel
 930  **/
 931 static int vti6_dev_init(struct net_device *dev)
 932 {
 933         struct ip6_tnl *t = netdev_priv(dev);
 934         int err = vti6_dev_init_gen(dev);
 935 
 936         if (err)
 937                 return err;
 938         vti6_link_config(t, true);
 939         return 0;
 940 }
 941 
 942 /**
 943  * vti6_fb_tnl_dev_init - initializer for fallback tunnel device
 944  *   @dev: fallback device
 945  *
 946  * Return: 0
 947  **/
 948 static int __net_init vti6_fb_tnl_dev_init(struct net_device *dev)
 949 {
 950         struct ip6_tnl *t = netdev_priv(dev);
 951         struct net *net = dev_net(dev);
 952         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
 953 
 954         t->parms.proto = IPPROTO_IPV6;
 955         dev_hold(dev);
 956 
 957         rcu_assign_pointer(ip6n->tnls_wc[0], t);
 958         return 0;
 959 }
 960 
 961 static int vti6_validate(struct nlattr *tb[], struct nlattr *data[],
 962                          struct netlink_ext_ack *extack)
 963 {
 964         return 0;
 965 }
 966 
 967 static void vti6_netlink_parms(struct nlattr *data[],
 968                                struct __ip6_tnl_parm *parms)
 969 {
 970         memset(parms, 0, sizeof(*parms));
 971 
 972         if (!data)
 973                 return;
 974 
 975         if (data[IFLA_VTI_LINK])
 976                 parms->link = nla_get_u32(data[IFLA_VTI_LINK]);
 977 
 978         if (data[IFLA_VTI_LOCAL])
 979                 parms->laddr = nla_get_in6_addr(data[IFLA_VTI_LOCAL]);
 980 
 981         if (data[IFLA_VTI_REMOTE])
 982                 parms->raddr = nla_get_in6_addr(data[IFLA_VTI_REMOTE]);
 983 
 984         if (data[IFLA_VTI_IKEY])
 985                 parms->i_key = nla_get_be32(data[IFLA_VTI_IKEY]);
 986 
 987         if (data[IFLA_VTI_OKEY])
 988                 parms->o_key = nla_get_be32(data[IFLA_VTI_OKEY]);
 989 
 990         if (data[IFLA_VTI_FWMARK])
 991                 parms->fwmark = nla_get_u32(data[IFLA_VTI_FWMARK]);
 992 }
 993 
 994 static int vti6_newlink(struct net *src_net, struct net_device *dev,
 995                         struct nlattr *tb[], struct nlattr *data[],
 996                         struct netlink_ext_ack *extack)
 997 {
 998         struct net *net = dev_net(dev);
 999         struct ip6_tnl *nt;
1000 
1001         nt = netdev_priv(dev);
1002         vti6_netlink_parms(data, &nt->parms);
1003 
1004         nt->parms.proto = IPPROTO_IPV6;
1005 
1006         if (vti6_locate(net, &nt->parms, 0))
1007                 return -EEXIST;
1008 
1009         return vti6_tnl_create2(dev);
1010 }
1011 
1012 static void vti6_dellink(struct net_device *dev, struct list_head *head)
1013 {
1014         struct net *net = dev_net(dev);
1015         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1016 
1017         if (dev != ip6n->fb_tnl_dev)
1018                 unregister_netdevice_queue(dev, head);
1019 }
1020 
1021 static int vti6_changelink(struct net_device *dev, struct nlattr *tb[],
1022                            struct nlattr *data[],
1023                            struct netlink_ext_ack *extack)
1024 {
1025         struct ip6_tnl *t;
1026         struct __ip6_tnl_parm p;
1027         struct net *net = dev_net(dev);
1028         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1029 
1030         if (dev == ip6n->fb_tnl_dev)
1031                 return -EINVAL;
1032 
1033         vti6_netlink_parms(data, &p);
1034 
1035         t = vti6_locate(net, &p, 0);
1036 
1037         if (t) {
1038                 if (t->dev != dev)
1039                         return -EEXIST;
1040         } else
1041                 t = netdev_priv(dev);
1042 
1043         return vti6_update(t, &p, tb && tb[IFLA_MTU]);
1044 }
1045 
1046 static size_t vti6_get_size(const struct net_device *dev)
1047 {
1048         return
1049                 /* IFLA_VTI_LINK */
1050                 nla_total_size(4) +
1051                 /* IFLA_VTI_LOCAL */
1052                 nla_total_size(sizeof(struct in6_addr)) +
1053                 /* IFLA_VTI_REMOTE */
1054                 nla_total_size(sizeof(struct in6_addr)) +
1055                 /* IFLA_VTI_IKEY */
1056                 nla_total_size(4) +
1057                 /* IFLA_VTI_OKEY */
1058                 nla_total_size(4) +
1059                 /* IFLA_VTI_FWMARK */
1060                 nla_total_size(4) +
1061                 0;
1062 }
1063 
1064 static int vti6_fill_info(struct sk_buff *skb, const struct net_device *dev)
1065 {
1066         struct ip6_tnl *tunnel = netdev_priv(dev);
1067         struct __ip6_tnl_parm *parm = &tunnel->parms;
1068 
1069         if (nla_put_u32(skb, IFLA_VTI_LINK, parm->link) ||
1070             nla_put_in6_addr(skb, IFLA_VTI_LOCAL, &parm->laddr) ||
1071             nla_put_in6_addr(skb, IFLA_VTI_REMOTE, &parm->raddr) ||
1072             nla_put_be32(skb, IFLA_VTI_IKEY, parm->i_key) ||
1073             nla_put_be32(skb, IFLA_VTI_OKEY, parm->o_key) ||
1074             nla_put_u32(skb, IFLA_VTI_FWMARK, parm->fwmark))
1075                 goto nla_put_failure;
1076         return 0;
1077 
1078 nla_put_failure:
1079         return -EMSGSIZE;
1080 }
1081 
1082 static const struct nla_policy vti6_policy[IFLA_VTI_MAX + 1] = {
1083         [IFLA_VTI_LINK]         = { .type = NLA_U32 },
1084         [IFLA_VTI_LOCAL]        = { .len = sizeof(struct in6_addr) },
1085         [IFLA_VTI_REMOTE]       = { .len = sizeof(struct in6_addr) },
1086         [IFLA_VTI_IKEY]         = { .type = NLA_U32 },
1087         [IFLA_VTI_OKEY]         = { .type = NLA_U32 },
1088         [IFLA_VTI_FWMARK]       = { .type = NLA_U32 },
1089 };
1090 
1091 static struct rtnl_link_ops vti6_link_ops __read_mostly = {
1092         .kind           = "vti6",
1093         .maxtype        = IFLA_VTI_MAX,
1094         .policy         = vti6_policy,
1095         .priv_size      = sizeof(struct ip6_tnl),
1096         .setup          = vti6_dev_setup,
1097         .validate       = vti6_validate,
1098         .newlink        = vti6_newlink,
1099         .dellink        = vti6_dellink,
1100         .changelink     = vti6_changelink,
1101         .get_size       = vti6_get_size,
1102         .fill_info      = vti6_fill_info,
1103         .get_link_net   = ip6_tnl_get_link_net,
1104 };
1105 
1106 static void __net_exit vti6_destroy_tunnels(struct vti6_net *ip6n,
1107                                             struct list_head *list)
1108 {
1109         int h;
1110         struct ip6_tnl *t;
1111 
1112         for (h = 0; h < IP6_VTI_HASH_SIZE; h++) {
1113                 t = rtnl_dereference(ip6n->tnls_r_l[h]);
1114                 while (t) {
1115                         unregister_netdevice_queue(t->dev, list);
1116                         t = rtnl_dereference(t->next);
1117                 }
1118         }
1119 
1120         t = rtnl_dereference(ip6n->tnls_wc[0]);
1121         if (t)
1122                 unregister_netdevice_queue(t->dev, list);
1123 }
1124 
1125 static int __net_init vti6_init_net(struct net *net)
1126 {
1127         struct vti6_net *ip6n = net_generic(net, vti6_net_id);
1128         struct ip6_tnl *t = NULL;
1129         int err;
1130 
1131         ip6n->tnls[0] = ip6n->tnls_wc;
1132         ip6n->tnls[1] = ip6n->tnls_r_l;
1133 
1134         if (!net_has_fallback_tunnels(net))
1135                 return 0;
1136         err = -ENOMEM;
1137         ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6_vti0",
1138                                         NET_NAME_UNKNOWN, vti6_dev_setup);
1139 
1140         if (!ip6n->fb_tnl_dev)
1141                 goto err_alloc_dev;
1142         dev_net_set(ip6n->fb_tnl_dev, net);
1143         ip6n->fb_tnl_dev->rtnl_link_ops = &vti6_link_ops;
1144 
1145         err = vti6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
1146         if (err < 0)
1147                 goto err_register;
1148 
1149         err = register_netdev(ip6n->fb_tnl_dev);
1150         if (err < 0)
1151                 goto err_register;
1152 
1153         t = netdev_priv(ip6n->fb_tnl_dev);
1154 
1155         strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
1156         return 0;
1157 
1158 err_register:
1159         free_netdev(ip6n->fb_tnl_dev);
1160 err_alloc_dev:
1161         return err;
1162 }
1163 
1164 static void __net_exit vti6_exit_batch_net(struct list_head *net_list)
1165 {
1166         struct vti6_net *ip6n;
1167         struct net *net;
1168         LIST_HEAD(list);
1169 
1170         rtnl_lock();
1171         list_for_each_entry(net, net_list, exit_list) {
1172                 ip6n = net_generic(net, vti6_net_id);
1173                 vti6_destroy_tunnels(ip6n, &list);
1174         }
1175         unregister_netdevice_many(&list);
1176         rtnl_unlock();
1177 }
1178 
1179 static struct pernet_operations vti6_net_ops = {
1180         .init = vti6_init_net,
1181         .exit_batch = vti6_exit_batch_net,
1182         .id   = &vti6_net_id,
1183         .size = sizeof(struct vti6_net),
1184 };
1185 
1186 static struct xfrm6_protocol vti_esp6_protocol __read_mostly = {
1187         .handler        =       vti6_rcv,
1188         .cb_handler     =       vti6_rcv_cb,
1189         .err_handler    =       vti6_err,
1190         .priority       =       100,
1191 };
1192 
1193 static struct xfrm6_protocol vti_ah6_protocol __read_mostly = {
1194         .handler        =       vti6_rcv,
1195         .cb_handler     =       vti6_rcv_cb,
1196         .err_handler    =       vti6_err,
1197         .priority       =       100,
1198 };
1199 
1200 static struct xfrm6_protocol vti_ipcomp6_protocol __read_mostly = {
1201         .handler        =       vti6_rcv,
1202         .cb_handler     =       vti6_rcv_cb,
1203         .err_handler    =       vti6_err,
1204         .priority       =       100,
1205 };
1206 
1207 /**
1208  * vti6_tunnel_init - register protocol and reserve needed resources
1209  *
1210  * Return: 0 on success
1211  **/
1212 static int __init vti6_tunnel_init(void)
1213 {
1214         const char *msg;
1215         int err;
1216 
1217         msg = "tunnel device";
1218         err = register_pernet_device(&vti6_net_ops);
1219         if (err < 0)
1220                 goto pernet_dev_failed;
1221 
1222         msg = "tunnel protocols";
1223         err = xfrm6_protocol_register(&vti_esp6_protocol, IPPROTO_ESP);
1224         if (err < 0)
1225                 goto xfrm_proto_esp_failed;
1226         err = xfrm6_protocol_register(&vti_ah6_protocol, IPPROTO_AH);
1227         if (err < 0)
1228                 goto xfrm_proto_ah_failed;
1229         err = xfrm6_protocol_register(&vti_ipcomp6_protocol, IPPROTO_COMP);
1230         if (err < 0)
1231                 goto xfrm_proto_comp_failed;
1232 
1233         msg = "netlink interface";
1234         err = rtnl_link_register(&vti6_link_ops);
1235         if (err < 0)
1236                 goto rtnl_link_failed;
1237 
1238         return 0;
1239 
1240 rtnl_link_failed:
1241         xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1242 xfrm_proto_comp_failed:
1243         xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1244 xfrm_proto_ah_failed:
1245         xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1246 xfrm_proto_esp_failed:
1247         unregister_pernet_device(&vti6_net_ops);
1248 pernet_dev_failed:
1249         pr_err("vti6 init: failed to register %s\n", msg);
1250         return err;
1251 }
1252 
1253 /**
1254  * vti6_tunnel_cleanup - free resources and unregister protocol
1255  **/
1256 static void __exit vti6_tunnel_cleanup(void)
1257 {
1258         rtnl_link_unregister(&vti6_link_ops);
1259         xfrm6_protocol_deregister(&vti_ipcomp6_protocol, IPPROTO_COMP);
1260         xfrm6_protocol_deregister(&vti_ah6_protocol, IPPROTO_AH);
1261         xfrm6_protocol_deregister(&vti_esp6_protocol, IPPROTO_ESP);
1262         unregister_pernet_device(&vti6_net_ops);
1263 }
1264 
1265 module_init(vti6_tunnel_init);
1266 module_exit(vti6_tunnel_cleanup);
1267 MODULE_LICENSE("GPL");
1268 MODULE_ALIAS_RTNL_LINK("vti6");
1269 MODULE_ALIAS_NETDEV("ip6_vti0");
1270 MODULE_AUTHOR("Steffen Klassert");
1271 MODULE_DESCRIPTION("IPv6 virtual tunnel interface");
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root/net/ipv6/ip6_vti.c

DEFINITIONS
