1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 * 10 * Changes: 11 * Roger Venning <r.venning@telstra.com>: 6to4 support 12 * Nate Thompson <nate@thebog.net>: 6to4 support 13 * Fred Templin <fred.l.templin@boeing.com>: isatap support 14 */ 15 16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18 #include <linux/module.h> 19 #include <linux/capability.h> 20 #include <linux/errno.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/sockios.h> 24 #include <linux/net.h> 25 #include <linux/in6.h> 26 #include <linux/netdevice.h> 27 #include <linux/if_arp.h> 28 #include <linux/icmp.h> 29 #include <linux/slab.h> 30 #include <linux/uaccess.h> 31 #include <linux/init.h> 32 #include <linux/netfilter_ipv4.h> 33 #include <linux/if_ether.h> 34 35 #include <net/sock.h> 36 #include <net/snmp.h> 37 38 #include <net/ipv6.h> 39 #include <net/protocol.h> 40 #include <net/transp_v6.h> 41 #include <net/ip6_fib.h> 42 #include <net/ip6_route.h> 43 #include <net/ndisc.h> 44 #include <net/addrconf.h> 45 #include <net/ip.h> 46 #include <net/udp.h> 47 #include <net/icmp.h> 48 #include <net/ip_tunnels.h> 49 #include <net/inet_ecn.h> 50 #include <net/xfrm.h> 51 #include <net/dsfield.h> 52 #include <net/net_namespace.h> 53 #include <net/netns/generic.h> 54 #include <net/netdev_lock.h> 55 #include <net/inet_dscp.h> 56 57 /* 58 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c 59 60 For comments look at net/ipv4/ip_gre.c --ANK 61 */ 62 63 #define IP6_SIT_HASH_SIZE 16 64 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) 65 66 static bool log_ecn_error = true; 67 module_param(log_ecn_error, bool, 0644); 68 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 69 70 static int ipip6_tunnel_init(struct net_device *dev); 71 static void ipip6_tunnel_setup(struct net_device *dev); 72 static void ipip6_dev_free(struct net_device *dev); 73 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 74 __be32 *v4dst); 75 static struct rtnl_link_ops sit_link_ops __read_mostly; 76 77 static unsigned int sit_net_id __read_mostly; 78 struct sit_net { 79 struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; 80 struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; 81 struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; 82 struct ip_tunnel __rcu *tunnels_wc[1]; 83 struct ip_tunnel __rcu **tunnels[4]; 84 85 struct net_device *fb_tunnel_dev; 86 }; 87 88 static inline struct sit_net *dev_to_sit_net(struct net_device *dev) 89 { 90 struct ip_tunnel *t = netdev_priv(dev); 91 92 return net_generic(t->net, sit_net_id); 93 } 94 95 /* 96 * Must be invoked with rcu_read_lock 97 */ 98 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, 99 struct net_device *dev, 100 __be32 remote, __be32 local, 101 int sifindex) 102 { 103 unsigned int h0 = HASH(remote); 104 unsigned int h1 = HASH(local); 105 struct ip_tunnel *t; 106 struct sit_net *sitn = net_generic(net, sit_net_id); 107 int ifindex = dev ? dev->ifindex : 0; 108 109 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { 110 if (local == t->parms.iph.saddr && 111 remote == t->parms.iph.daddr && 112 (!dev || !t->parms.link || ifindex == t->parms.link || 113 sifindex == t->parms.link) && 114 (t->dev->flags & IFF_UP)) 115 return t; 116 } 117 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { 118 if (remote == t->parms.iph.daddr && 119 (!dev || !t->parms.link || ifindex == t->parms.link || 120 sifindex == t->parms.link) && 121 (t->dev->flags & IFF_UP)) 122 return t; 123 } 124 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { 125 if (local == t->parms.iph.saddr && 126 (!dev || !t->parms.link || ifindex == t->parms.link || 127 sifindex == t->parms.link) && 128 (t->dev->flags & IFF_UP)) 129 return t; 130 } 131 t = rcu_dereference(sitn->tunnels_wc[0]); 132 if (t && (t->dev->flags & IFF_UP)) 133 return t; 134 return NULL; 135 } 136 137 static struct ip_tunnel __rcu ** 138 __ipip6_bucket(struct sit_net *sitn, struct ip_tunnel_parm_kern *parms) 139 { 140 __be32 remote = parms->iph.daddr; 141 __be32 local = parms->iph.saddr; 142 unsigned int h = 0; 143 int prio = 0; 144 145 if (remote) { 146 prio |= 2; 147 h ^= HASH(remote); 148 } 149 if (local) { 150 prio |= 1; 151 h ^= HASH(local); 152 } 153 return &sitn->tunnels[prio][h]; 154 } 155 156 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, 157 struct ip_tunnel *t) 158 { 159 return __ipip6_bucket(sitn, &t->parms); 160 } 161 162 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) 163 { 164 struct ip_tunnel __rcu **tp; 165 struct ip_tunnel *iter; 166 167 for (tp = ipip6_bucket(sitn, t); 168 (iter = rtnl_dereference(*tp)) != NULL; 169 tp = &iter->next) { 170 if (t == iter) { 171 rcu_assign_pointer(*tp, t->next); 172 break; 173 } 174 } 175 } 176 177 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) 178 { 179 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); 180 181 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 182 rcu_assign_pointer(*tp, t); 183 } 184 185 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) 186 { 187 #ifdef CONFIG_IPV6_SIT_6RD 188 struct ip_tunnel *t = netdev_priv(dev); 189 190 if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) { 191 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); 192 t->ip6rd.relay_prefix = 0; 193 t->ip6rd.prefixlen = 16; 194 t->ip6rd.relay_prefixlen = 0; 195 } else { 196 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); 197 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); 198 } 199 #endif 200 } 201 202 static int ipip6_tunnel_create(struct net_device *dev) 203 { 204 struct ip_tunnel *t = netdev_priv(dev); 205 struct sit_net *sitn = net_generic(t->net, sit_net_id); 206 int err; 207 208 __dev_addr_set(dev, &t->parms.iph.saddr, 4); 209 memcpy(dev->broadcast, &t->parms.iph.daddr, 4); 210 211 if (test_bit(IP_TUNNEL_SIT_ISATAP_BIT, t->parms.i_flags)) 212 dev->priv_flags |= IFF_ISATAP; 213 214 dev->rtnl_link_ops = &sit_link_ops; 215 216 err = register_netdevice(dev); 217 if (err < 0) 218 goto out; 219 220 ipip6_tunnel_clone_6rd(dev, sitn); 221 222 ipip6_tunnel_link(sitn, t); 223 return 0; 224 225 out: 226 return err; 227 } 228 229 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, 230 struct ip_tunnel_parm_kern *parms, 231 int create) 232 { 233 __be32 remote = parms->iph.daddr; 234 __be32 local = parms->iph.saddr; 235 struct ip_tunnel *t, *nt; 236 struct ip_tunnel __rcu **tp; 237 struct net_device *dev; 238 char name[IFNAMSIZ]; 239 struct sit_net *sitn = net_generic(net, sit_net_id); 240 241 for (tp = __ipip6_bucket(sitn, parms); 242 (t = rtnl_dereference(*tp)) != NULL; 243 tp = &t->next) { 244 if (local == t->parms.iph.saddr && 245 remote == t->parms.iph.daddr && 246 parms->link == t->parms.link) { 247 if (create) 248 return NULL; 249 else 250 return t; 251 } 252 } 253 if (!create) 254 goto failed; 255 256 if (parms->name[0]) { 257 if (!dev_valid_name(parms->name)) 258 goto failed; 259 strscpy(name, parms->name, IFNAMSIZ); 260 } else { 261 strcpy(name, "sit%d"); 262 } 263 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 264 ipip6_tunnel_setup); 265 if (!dev) 266 return NULL; 267 268 dev_net_set(dev, net); 269 270 nt = netdev_priv(dev); 271 272 nt->net = net; 273 nt->parms = *parms; 274 if (ipip6_tunnel_create(dev) < 0) 275 goto failed_free; 276 277 if (!parms->name[0]) 278 strcpy(parms->name, dev->name); 279 280 return nt; 281 282 failed_free: 283 free_netdev(dev); 284 failed: 285 return NULL; 286 } 287 288 #define for_each_prl_rcu(start) \ 289 for (prl = rcu_dereference(start); \ 290 prl; \ 291 prl = rcu_dereference(prl->next)) 292 293 static struct ip_tunnel_prl_entry * 294 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 295 { 296 struct ip_tunnel_prl_entry *prl; 297 298 for_each_prl_rcu(t->prl) 299 if (prl->addr == addr) 300 break; 301 return prl; 302 303 } 304 305 static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __user *a) 306 { 307 struct ip_tunnel *t = netdev_priv(dev); 308 struct ip_tunnel_prl kprl, *kp; 309 struct ip_tunnel_prl_entry *prl; 310 unsigned int cmax, c = 0, ca, len; 311 int ret = 0; 312 313 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 314 return -EINVAL; 315 316 if (copy_from_user(&kprl, a, sizeof(kprl))) 317 return -EFAULT; 318 cmax = kprl.datalen / sizeof(kprl); 319 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 320 cmax = 1; 321 322 /* For simple GET or for root users, 323 * we try harder to allocate. 324 */ 325 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 326 kcalloc(cmax, sizeof(*kp), GFP_KERNEL_ACCOUNT | __GFP_NOWARN) : 327 NULL; 328 329 ca = min(t->prl_count, cmax); 330 331 if (!kp) { 332 /* We don't try hard to allocate much memory for 333 * non-root users. 334 * For root users, retry allocating enough memory for 335 * the answer. 336 */ 337 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC | __GFP_ACCOUNT | 338 __GFP_NOWARN); 339 if (!kp) { 340 ret = -ENOMEM; 341 goto out; 342 } 343 } 344 345 rcu_read_lock(); 346 for_each_prl_rcu(t->prl) { 347 if (c >= cmax) 348 break; 349 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 350 continue; 351 kp[c].addr = prl->addr; 352 kp[c].flags = prl->flags; 353 c++; 354 if (kprl.addr != htonl(INADDR_ANY)) 355 break; 356 } 357 358 rcu_read_unlock(); 359 360 len = sizeof(*kp) * c; 361 ret = 0; 362 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 363 ret = -EFAULT; 364 365 kfree(kp); 366 out: 367 return ret; 368 } 369 370 static int 371 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 372 { 373 struct ip_tunnel_prl_entry *p; 374 int err = 0; 375 376 if (a->addr == htonl(INADDR_ANY)) 377 return -EINVAL; 378 379 ASSERT_RTNL(); 380 381 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 382 if (p->addr == a->addr) { 383 if (chg) { 384 p->flags = a->flags; 385 goto out; 386 } 387 err = -EEXIST; 388 goto out; 389 } 390 } 391 392 if (chg) { 393 err = -ENXIO; 394 goto out; 395 } 396 397 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 398 if (!p) { 399 err = -ENOBUFS; 400 goto out; 401 } 402 403 p->next = t->prl; 404 p->addr = a->addr; 405 p->flags = a->flags; 406 t->prl_count++; 407 rcu_assign_pointer(t->prl, p); 408 out: 409 return err; 410 } 411 412 static void prl_list_destroy_rcu(struct rcu_head *head) 413 { 414 struct ip_tunnel_prl_entry *p, *n; 415 416 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 417 do { 418 n = rcu_dereference_protected(p->next, 1); 419 kfree(p); 420 p = n; 421 } while (p); 422 } 423 424 static int 425 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 426 { 427 struct ip_tunnel_prl_entry *x; 428 struct ip_tunnel_prl_entry __rcu **p; 429 int err = 0; 430 431 ASSERT_RTNL(); 432 433 if (a && a->addr != htonl(INADDR_ANY)) { 434 for (p = &t->prl; 435 (x = rtnl_dereference(*p)) != NULL; 436 p = &x->next) { 437 if (x->addr == a->addr) { 438 *p = x->next; 439 kfree_rcu(x, rcu_head); 440 t->prl_count--; 441 goto out; 442 } 443 } 444 err = -ENXIO; 445 } else { 446 x = rtnl_dereference(t->prl); 447 if (x) { 448 t->prl_count = 0; 449 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 450 t->prl = NULL; 451 } 452 } 453 out: 454 return err; 455 } 456 457 static int ipip6_tunnel_prl_ctl(struct net_device *dev, 458 struct ip_tunnel_prl __user *data, int cmd) 459 { 460 struct ip_tunnel *t = netdev_priv(dev); 461 struct ip_tunnel_prl prl; 462 int err; 463 464 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 465 return -EPERM; 466 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 467 return -EINVAL; 468 469 if (copy_from_user(&prl, data, sizeof(prl))) 470 return -EFAULT; 471 472 switch (cmd) { 473 case SIOCDELPRL: 474 err = ipip6_tunnel_del_prl(t, &prl); 475 break; 476 case SIOCADDPRL: 477 case SIOCCHGPRL: 478 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 479 break; 480 } 481 dst_cache_reset(&t->dst_cache); 482 netdev_state_change(dev); 483 return err; 484 } 485 486 static int 487 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 488 { 489 struct ip_tunnel_prl_entry *p; 490 int ok = 1; 491 492 rcu_read_lock(); 493 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 494 if (p) { 495 if (p->flags & PRL_DEFAULT) 496 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 497 else 498 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 499 } else { 500 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 501 502 if (ipv6_addr_is_isatap(addr6) && 503 (addr6->s6_addr32[3] == iph->saddr) && 504 ipv6_chk_prefix(addr6, t->dev)) 505 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 506 else 507 ok = 0; 508 } 509 rcu_read_unlock(); 510 return ok; 511 } 512 513 static void ipip6_tunnel_uninit(struct net_device *dev) 514 { 515 struct ip_tunnel *tunnel = netdev_priv(dev); 516 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); 517 518 if (dev == sitn->fb_tunnel_dev) { 519 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 520 } else { 521 ipip6_tunnel_unlink(sitn, tunnel); 522 ipip6_tunnel_del_prl(tunnel, NULL); 523 } 524 dst_cache_reset(&tunnel->dst_cache); 525 netdev_put(dev, &tunnel->dev_tracker); 526 } 527 528 static int ipip6_err(struct sk_buff *skb, u32 info) 529 { 530 const struct iphdr *iph = (const struct iphdr *)skb->data; 531 const int type = icmp_hdr(skb)->type; 532 const int code = icmp_hdr(skb)->code; 533 unsigned int data_len = 0; 534 struct ip_tunnel *t; 535 int sifindex; 536 int err; 537 538 switch (type) { 539 default: 540 case ICMP_PARAMETERPROB: 541 return 0; 542 543 case ICMP_DEST_UNREACH: 544 switch (code) { 545 case ICMP_SR_FAILED: 546 /* Impossible event. */ 547 return 0; 548 default: 549 /* All others are translated to HOST_UNREACH. 550 rfc2003 contains "deep thoughts" about NET_UNREACH, 551 I believe they are just ether pollution. --ANK 552 */ 553 break; 554 } 555 break; 556 case ICMP_TIME_EXCEEDED: 557 if (code != ICMP_EXC_TTL) 558 return 0; 559 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ 560 break; 561 case ICMP_REDIRECT: 562 break; 563 } 564 565 err = -ENOENT; 566 567 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 568 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 569 iph->daddr, iph->saddr, sifindex); 570 if (!t) 571 goto out; 572 573 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 574 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 575 t->parms.link, iph->protocol); 576 err = 0; 577 goto out; 578 } 579 if (type == ICMP_REDIRECT) { 580 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 581 iph->protocol); 582 err = 0; 583 goto out; 584 } 585 586 err = 0; 587 if (__in6_dev_get(skb->dev) && 588 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 589 goto out; 590 591 if (t->parms.iph.daddr == 0) 592 goto out; 593 594 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 595 goto out; 596 597 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 598 t->err_count++; 599 else 600 t->err_count = 1; 601 t->err_time = jiffies; 602 out: 603 return err; 604 } 605 606 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 607 const struct in6_addr *v6addr) 608 { 609 __be32 v4embed = 0; 610 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 611 return true; 612 return false; 613 } 614 615 /* Checks if an address matches an address on the tunnel interface. 616 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 617 * Long story: 618 * This function is called after we considered the packet as spoofed 619 * in is_spoofed_6rd. 620 * We may have a router that is doing NAT for proto 41 packets 621 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 622 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 623 * function will return true, dropping the packet. 624 * But, we can still check if is spoofed against the IP 625 * addresses associated with the interface. 626 */ 627 static bool only_dnatted(const struct ip_tunnel *tunnel, 628 const struct in6_addr *v6dst) 629 { 630 int prefix_len; 631 632 #ifdef CONFIG_IPV6_SIT_6RD 633 prefix_len = tunnel->ip6rd.prefixlen + 32 634 - tunnel->ip6rd.relay_prefixlen; 635 #else 636 prefix_len = 48; 637 #endif 638 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 639 } 640 641 /* Returns true if a packet is spoofed */ 642 static bool packet_is_spoofed(struct sk_buff *skb, 643 const struct iphdr *iph, 644 struct ip_tunnel *tunnel) 645 { 646 const struct ipv6hdr *ipv6h; 647 648 if (tunnel->dev->priv_flags & IFF_ISATAP) { 649 if (!isatap_chksrc(skb, iph, tunnel)) 650 return true; 651 652 return false; 653 } 654 655 if (tunnel->dev->flags & IFF_POINTOPOINT) 656 return false; 657 658 ipv6h = ipv6_hdr(skb); 659 660 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 661 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 662 &iph->saddr, &ipv6h->saddr, 663 &iph->daddr, &ipv6h->daddr); 664 return true; 665 } 666 667 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 668 return false; 669 670 if (only_dnatted(tunnel, &ipv6h->daddr)) 671 return false; 672 673 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 674 &iph->saddr, &ipv6h->saddr, 675 &iph->daddr, &ipv6h->daddr); 676 return true; 677 } 678 679 static int ipip6_rcv(struct sk_buff *skb) 680 { 681 const struct iphdr *iph = ip_hdr(skb); 682 struct ip_tunnel *tunnel; 683 int sifindex; 684 int err; 685 686 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 687 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 688 iph->saddr, iph->daddr, sifindex); 689 if (tunnel) { 690 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 691 tunnel->parms.iph.protocol != 0) 692 goto out; 693 694 skb->mac_header = skb->network_header; 695 skb_reset_network_header(skb); 696 IPCB(skb)->flags = 0; 697 skb->dev = tunnel->dev; 698 699 if (packet_is_spoofed(skb, iph, tunnel)) { 700 DEV_STATS_INC(tunnel->dev, rx_errors); 701 goto out; 702 } 703 704 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 705 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 706 goto out; 707 708 /* skb can be uncloned in iptunnel_pull_header, so 709 * old iph is no longer valid 710 */ 711 iph = (const struct iphdr *)skb_mac_header(skb); 712 skb_reset_mac_header(skb); 713 714 err = IP_ECN_decapsulate(iph, skb); 715 if (unlikely(err)) { 716 if (log_ecn_error) 717 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 718 &iph->saddr, iph->tos); 719 if (err > 1) { 720 DEV_STATS_INC(tunnel->dev, rx_frame_errors); 721 DEV_STATS_INC(tunnel->dev, rx_errors); 722 goto out; 723 } 724 } 725 726 dev_sw_netstats_rx_add(tunnel->dev, skb->len); 727 728 netif_rx(skb); 729 730 return 0; 731 } 732 733 /* no tunnel matched, let upstream know, ipsec may handle it */ 734 return 1; 735 out: 736 kfree_skb(skb); 737 return 0; 738 } 739 740 static const struct tnl_ptk_info ipip_tpi = { 741 /* no tunnel info required for ipip. */ 742 .proto = htons(ETH_P_IP), 743 }; 744 745 #if IS_ENABLED(CONFIG_MPLS) 746 static const struct tnl_ptk_info mplsip_tpi = { 747 /* no tunnel info required for mplsip. */ 748 .proto = htons(ETH_P_MPLS_UC), 749 }; 750 #endif 751 752 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 753 { 754 const struct iphdr *iph; 755 struct ip_tunnel *tunnel; 756 int sifindex; 757 758 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 759 760 iph = ip_hdr(skb); 761 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 762 iph->saddr, iph->daddr, sifindex); 763 if (tunnel) { 764 const struct tnl_ptk_info *tpi; 765 766 if (tunnel->parms.iph.protocol != ipproto && 767 tunnel->parms.iph.protocol != 0) 768 goto drop; 769 770 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 771 goto drop; 772 #if IS_ENABLED(CONFIG_MPLS) 773 if (ipproto == IPPROTO_MPLS) 774 tpi = &mplsip_tpi; 775 else 776 #endif 777 tpi = &ipip_tpi; 778 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 779 goto drop; 780 skb_reset_mac_header(skb); 781 782 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 783 } 784 785 return 1; 786 787 drop: 788 kfree_skb(skb); 789 return 0; 790 } 791 792 static int ipip_rcv(struct sk_buff *skb) 793 { 794 return sit_tunnel_rcv(skb, IPPROTO_IPIP); 795 } 796 797 #if IS_ENABLED(CONFIG_MPLS) 798 static int mplsip_rcv(struct sk_buff *skb) 799 { 800 return sit_tunnel_rcv(skb, IPPROTO_MPLS); 801 } 802 #endif 803 804 /* 805 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 806 * stores the embedded IPv4 address in v4dst and returns true. 807 */ 808 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 809 __be32 *v4dst) 810 { 811 #ifdef CONFIG_IPV6_SIT_6RD 812 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 813 tunnel->ip6rd.prefixlen)) { 814 unsigned int pbw0, pbi0; 815 int pbi1; 816 u32 d; 817 818 pbw0 = tunnel->ip6rd.prefixlen >> 5; 819 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 820 821 d = tunnel->ip6rd.relay_prefixlen < 32 ? 822 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 823 tunnel->ip6rd.relay_prefixlen : 0; 824 825 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 826 if (pbi1 > 0) 827 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 828 (32 - pbi1); 829 830 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 831 return true; 832 } 833 #else 834 if (v6dst->s6_addr16[0] == htons(0x2002)) { 835 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 836 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 837 return true; 838 } 839 #endif 840 return false; 841 } 842 843 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 844 const struct in6_addr *v6dst) 845 { 846 __be32 dst = 0; 847 check_6rd(tunnel, v6dst, &dst); 848 return dst; 849 } 850 851 static bool ipip6_tunnel_dst_find(struct sk_buff *skb, __be32 *dst, 852 bool is_isatap) 853 { 854 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 855 struct neighbour *neigh = NULL; 856 const struct in6_addr *addr6; 857 bool found = false; 858 int addr_type; 859 860 if (skb_dst(skb)) 861 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 862 863 if (!neigh) { 864 net_dbg_ratelimited("nexthop == NULL\n"); 865 return false; 866 } 867 868 addr6 = (const struct in6_addr *)&neigh->primary_key; 869 addr_type = ipv6_addr_type(addr6); 870 871 if (is_isatap) { 872 if ((addr_type & IPV6_ADDR_UNICAST) && 873 ipv6_addr_is_isatap(addr6)) { 874 *dst = addr6->s6_addr32[3]; 875 found = true; 876 } 877 } else { 878 if (addr_type == IPV6_ADDR_ANY) { 879 addr6 = &ipv6_hdr(skb)->daddr; 880 addr_type = ipv6_addr_type(addr6); 881 } 882 883 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) { 884 *dst = addr6->s6_addr32[3]; 885 found = true; 886 } 887 } 888 889 neigh_release(neigh); 890 891 return found; 892 } 893 894 /* 895 * This function assumes it is being called from dev_queue_xmit() 896 * and that skb is filled properly by that function. 897 */ 898 899 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 900 struct net_device *dev) 901 { 902 struct ip_tunnel *tunnel = netdev_priv(dev); 903 const struct iphdr *tiph = &tunnel->parms.iph; 904 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 905 u8 tos = tunnel->parms.iph.tos; 906 __be16 df = tiph->frag_off; 907 struct rtable *rt; /* Route to the other host */ 908 struct net_device *tdev; /* Device to other host */ 909 unsigned int max_headroom; /* The extra header space needed */ 910 __be32 dst = tiph->daddr; 911 struct flowi4 fl4; 912 int mtu; 913 u8 ttl; 914 u8 protocol = IPPROTO_IPV6; 915 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 916 917 if (tos == 1) 918 tos = ipv6_get_dsfield(iph6); 919 920 /* ISATAP (RFC4214) - must come before 6to4 */ 921 if ((dev->priv_flags & IFF_ISATAP) && 922 !ipip6_tunnel_dst_find(skb, &dst, true)) 923 goto tx_error; 924 925 if (!dst) 926 dst = try_6rd(tunnel, &iph6->daddr); 927 928 if (!dst && !ipip6_tunnel_dst_find(skb, &dst, false)) 929 goto tx_error; 930 931 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 932 tos & INET_DSCP_MASK, RT_SCOPE_UNIVERSE, 933 IPPROTO_IPV6, 0, dst, tiph->saddr, 0, 0, 934 sock_net_uid(tunnel->net, NULL)); 935 936 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); 937 if (!rt) { 938 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 939 if (IS_ERR(rt)) { 940 DEV_STATS_INC(dev, tx_carrier_errors); 941 goto tx_error_icmp; 942 } 943 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); 944 } 945 946 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { 947 ip_rt_put(rt); 948 DEV_STATS_INC(dev, tx_carrier_errors); 949 goto tx_error_icmp; 950 } 951 tdev = rt->dst.dev; 952 953 if (tdev == dev) { 954 ip_rt_put(rt); 955 DEV_STATS_INC(dev, collisions); 956 goto tx_error; 957 } 958 959 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 960 ip_rt_put(rt); 961 goto tx_error; 962 } 963 964 if (df) { 965 mtu = dst_mtu(&rt->dst) - t_hlen; 966 967 if (mtu < IPV4_MIN_MTU) { 968 DEV_STATS_INC(dev, collisions); 969 ip_rt_put(rt); 970 goto tx_error; 971 } 972 973 if (mtu < IPV6_MIN_MTU) { 974 mtu = IPV6_MIN_MTU; 975 df = 0; 976 } 977 978 if (tunnel->parms.iph.daddr) 979 skb_dst_update_pmtu_no_confirm(skb, mtu); 980 981 if (skb->len > mtu && !skb_is_gso(skb)) { 982 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 983 ip_rt_put(rt); 984 goto tx_error; 985 } 986 } 987 988 if (tunnel->err_count > 0) { 989 if (time_before(jiffies, 990 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 991 tunnel->err_count--; 992 dst_link_failure(skb); 993 } else 994 tunnel->err_count = 0; 995 } 996 997 /* 998 * Okay, now see if we can stuff it in the buffer as-is. 999 */ 1000 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 1001 1002 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1003 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1004 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 1005 if (!new_skb) { 1006 ip_rt_put(rt); 1007 DEV_STATS_INC(dev, tx_dropped); 1008 kfree_skb(skb); 1009 return NETDEV_TX_OK; 1010 } 1011 if (skb->sk) 1012 skb_set_owner_w(new_skb, skb->sk); 1013 dev_kfree_skb(skb); 1014 skb = new_skb; 1015 iph6 = ipv6_hdr(skb); 1016 } 1017 ttl = tiph->ttl; 1018 if (ttl == 0) 1019 ttl = iph6->hop_limit; 1020 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 1021 1022 if (ip_tunnel_encap(skb, &tunnel->encap, &protocol, &fl4) < 0) { 1023 ip_rt_put(rt); 1024 goto tx_error; 1025 } 1026 1027 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1028 1029 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 1030 df, !net_eq(tunnel->net, dev_net(dev)), 0); 1031 return NETDEV_TX_OK; 1032 1033 tx_error_icmp: 1034 dst_link_failure(skb); 1035 tx_error: 1036 kfree_skb(skb); 1037 DEV_STATS_INC(dev, tx_errors); 1038 return NETDEV_TX_OK; 1039 } 1040 1041 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1042 struct net_device *dev, u8 ipproto) 1043 { 1044 struct ip_tunnel *tunnel = netdev_priv(dev); 1045 const struct iphdr *tiph = &tunnel->parms.iph; 1046 1047 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1048 goto tx_error; 1049 1050 skb_set_inner_ipproto(skb, ipproto); 1051 1052 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1053 return NETDEV_TX_OK; 1054 tx_error: 1055 kfree_skb(skb); 1056 DEV_STATS_INC(dev, tx_errors); 1057 return NETDEV_TX_OK; 1058 } 1059 1060 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1061 struct net_device *dev) 1062 { 1063 if (!pskb_inet_may_pull(skb)) 1064 goto tx_err; 1065 1066 switch (skb->protocol) { 1067 case htons(ETH_P_IP): 1068 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1069 break; 1070 case htons(ETH_P_IPV6): 1071 ipip6_tunnel_xmit(skb, dev); 1072 break; 1073 #if IS_ENABLED(CONFIG_MPLS) 1074 case htons(ETH_P_MPLS_UC): 1075 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1076 break; 1077 #endif 1078 default: 1079 goto tx_err; 1080 } 1081 1082 return NETDEV_TX_OK; 1083 1084 tx_err: 1085 DEV_STATS_INC(dev, tx_errors); 1086 kfree_skb(skb); 1087 return NETDEV_TX_OK; 1088 1089 } 1090 1091 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1092 { 1093 struct ip_tunnel *tunnel = netdev_priv(dev); 1094 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1095 struct net_device *tdev = NULL; 1096 int hlen = LL_MAX_HEADER; 1097 const struct iphdr *iph; 1098 struct flowi4 fl4; 1099 1100 iph = &tunnel->parms.iph; 1101 1102 if (iph->daddr) { 1103 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1104 NULL, 1105 iph->daddr, iph->saddr, 1106 0, 0, 1107 IPPROTO_IPV6, 1108 iph->tos & INET_DSCP_MASK, 1109 tunnel->parms.link); 1110 1111 if (!IS_ERR(rt)) { 1112 tdev = rt->dst.dev; 1113 ip_rt_put(rt); 1114 } 1115 dev->flags |= IFF_POINTOPOINT; 1116 } 1117 1118 if (!tdev && tunnel->parms.link) 1119 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1120 1121 if (tdev && !netif_is_l3_master(tdev)) { 1122 int mtu; 1123 1124 mtu = tdev->mtu - t_hlen; 1125 if (mtu < IPV6_MIN_MTU) 1126 mtu = IPV6_MIN_MTU; 1127 WRITE_ONCE(dev->mtu, mtu); 1128 hlen = tdev->hard_header_len + tdev->needed_headroom; 1129 } 1130 dev->needed_headroom = t_hlen + hlen; 1131 } 1132 1133 static void ipip6_tunnel_update(struct ip_tunnel *t, 1134 struct ip_tunnel_parm_kern *p, 1135 __u32 fwmark) 1136 { 1137 struct net *net = t->net; 1138 struct sit_net *sitn = net_generic(net, sit_net_id); 1139 1140 ipip6_tunnel_unlink(sitn, t); 1141 synchronize_net(); 1142 t->parms.iph.saddr = p->iph.saddr; 1143 t->parms.iph.daddr = p->iph.daddr; 1144 __dev_addr_set(t->dev, &p->iph.saddr, 4); 1145 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1146 ipip6_tunnel_link(sitn, t); 1147 t->parms.iph.ttl = p->iph.ttl; 1148 t->parms.iph.tos = p->iph.tos; 1149 t->parms.iph.frag_off = p->iph.frag_off; 1150 if (t->parms.link != p->link || t->fwmark != fwmark) { 1151 t->parms.link = p->link; 1152 t->fwmark = fwmark; 1153 ipip6_tunnel_bind_dev(t->dev); 1154 } 1155 dst_cache_reset(&t->dst_cache); 1156 netdev_state_change(t->dev); 1157 } 1158 1159 #ifdef CONFIG_IPV6_SIT_6RD 1160 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1161 struct ip_tunnel_6rd *ip6rd) 1162 { 1163 struct in6_addr prefix; 1164 __be32 relay_prefix; 1165 1166 if (ip6rd->relay_prefixlen > 32 || 1167 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1168 return -EINVAL; 1169 1170 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1171 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1172 return -EINVAL; 1173 if (ip6rd->relay_prefixlen) 1174 relay_prefix = ip6rd->relay_prefix & 1175 htonl(0xffffffffUL << 1176 (32 - ip6rd->relay_prefixlen)); 1177 else 1178 relay_prefix = 0; 1179 if (relay_prefix != ip6rd->relay_prefix) 1180 return -EINVAL; 1181 1182 t->ip6rd.prefix = prefix; 1183 t->ip6rd.relay_prefix = relay_prefix; 1184 t->ip6rd.prefixlen = ip6rd->prefixlen; 1185 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1186 dst_cache_reset(&t->dst_cache); 1187 netdev_state_change(t->dev); 1188 return 0; 1189 } 1190 1191 static int 1192 ipip6_tunnel_get6rd(struct net_device *dev, struct ip_tunnel_parm __user *data) 1193 { 1194 struct ip_tunnel *t = netdev_priv(dev); 1195 struct ip_tunnel_parm_kern p; 1196 struct ip_tunnel_6rd ip6rd; 1197 1198 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1199 if (!ip_tunnel_parm_from_user(&p, data)) 1200 return -EFAULT; 1201 t = ipip6_tunnel_locate(t->net, &p, 0); 1202 } 1203 if (!t) 1204 t = netdev_priv(dev); 1205 1206 ip6rd.prefix = t->ip6rd.prefix; 1207 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1208 ip6rd.prefixlen = t->ip6rd.prefixlen; 1209 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1210 if (copy_to_user(data, &ip6rd, sizeof(ip6rd))) 1211 return -EFAULT; 1212 return 0; 1213 } 1214 1215 static int 1216 ipip6_tunnel_6rdctl(struct net_device *dev, struct ip_tunnel_6rd __user *data, 1217 int cmd) 1218 { 1219 struct ip_tunnel *t = netdev_priv(dev); 1220 struct ip_tunnel_6rd ip6rd; 1221 int err; 1222 1223 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1224 return -EPERM; 1225 if (copy_from_user(&ip6rd, data, sizeof(ip6rd))) 1226 return -EFAULT; 1227 1228 if (cmd != SIOCDEL6RD) { 1229 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1230 if (err < 0) 1231 return err; 1232 } else 1233 ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev)); 1234 return 0; 1235 } 1236 1237 #endif /* CONFIG_IPV6_SIT_6RD */ 1238 1239 static bool ipip6_valid_ip_proto(u8 ipproto) 1240 { 1241 return ipproto == IPPROTO_IPV6 || 1242 ipproto == IPPROTO_IPIP || 1243 #if IS_ENABLED(CONFIG_MPLS) 1244 ipproto == IPPROTO_MPLS || 1245 #endif 1246 ipproto == 0; 1247 } 1248 1249 static int 1250 __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm_kern *p) 1251 { 1252 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1253 return -EPERM; 1254 1255 if (!ipip6_valid_ip_proto(p->iph.protocol)) 1256 return -EINVAL; 1257 if (p->iph.version != 4 || 1258 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) 1259 return -EINVAL; 1260 1261 if (p->iph.ttl) 1262 p->iph.frag_off |= htons(IP_DF); 1263 return 0; 1264 } 1265 1266 static int 1267 ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm_kern *p) 1268 { 1269 struct ip_tunnel *t = netdev_priv(dev); 1270 1271 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 1272 t = ipip6_tunnel_locate(t->net, p, 0); 1273 if (!t) 1274 t = netdev_priv(dev); 1275 memcpy(p, &t->parms, sizeof(*p)); 1276 return 0; 1277 } 1278 1279 static int 1280 ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm_kern *p) 1281 { 1282 struct ip_tunnel *t = netdev_priv(dev); 1283 int err; 1284 1285 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1286 if (err) 1287 return err; 1288 1289 t = ipip6_tunnel_locate(t->net, p, 1); 1290 if (!t) 1291 return -ENOBUFS; 1292 return 0; 1293 } 1294 1295 static int 1296 ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm_kern *p) 1297 { 1298 struct ip_tunnel *t = netdev_priv(dev); 1299 int err; 1300 1301 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1302 if (err) 1303 return err; 1304 1305 t = ipip6_tunnel_locate(t->net, p, 0); 1306 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1307 if (!t) 1308 return -ENOENT; 1309 } else { 1310 if (t) { 1311 if (t->dev != dev) 1312 return -EEXIST; 1313 } else { 1314 if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) || 1315 (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr)) 1316 return -EINVAL; 1317 t = netdev_priv(dev); 1318 } 1319 1320 ipip6_tunnel_update(t, p, t->fwmark); 1321 } 1322 1323 return 0; 1324 } 1325 1326 static int 1327 ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm_kern *p) 1328 { 1329 struct ip_tunnel *t = netdev_priv(dev); 1330 1331 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1332 return -EPERM; 1333 1334 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1335 t = ipip6_tunnel_locate(t->net, p, 0); 1336 if (!t) 1337 return -ENOENT; 1338 if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev)) 1339 return -EPERM; 1340 dev = t->dev; 1341 } 1342 unregister_netdevice(dev); 1343 return 0; 1344 } 1345 1346 static int 1347 ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, 1348 int cmd) 1349 { 1350 switch (cmd) { 1351 case SIOCGETTUNNEL: 1352 return ipip6_tunnel_get(dev, p); 1353 case SIOCADDTUNNEL: 1354 return ipip6_tunnel_add(dev, p); 1355 case SIOCCHGTUNNEL: 1356 return ipip6_tunnel_change(dev, p); 1357 case SIOCDELTUNNEL: 1358 return ipip6_tunnel_del(dev, p); 1359 default: 1360 return -EINVAL; 1361 } 1362 } 1363 1364 static int 1365 ipip6_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 1366 void __user *data, int cmd) 1367 { 1368 switch (cmd) { 1369 case SIOCGETTUNNEL: 1370 case SIOCADDTUNNEL: 1371 case SIOCCHGTUNNEL: 1372 case SIOCDELTUNNEL: 1373 return ip_tunnel_siocdevprivate(dev, ifr, data, cmd); 1374 case SIOCGETPRL: 1375 return ipip6_tunnel_get_prl(dev, data); 1376 case SIOCADDPRL: 1377 case SIOCDELPRL: 1378 case SIOCCHGPRL: 1379 return ipip6_tunnel_prl_ctl(dev, data, cmd); 1380 #ifdef CONFIG_IPV6_SIT_6RD 1381 case SIOCGET6RD: 1382 return ipip6_tunnel_get6rd(dev, data); 1383 case SIOCADD6RD: 1384 case SIOCCHG6RD: 1385 case SIOCDEL6RD: 1386 return ipip6_tunnel_6rdctl(dev, data, cmd); 1387 #endif 1388 default: 1389 return -EINVAL; 1390 } 1391 } 1392 1393 static const struct net_device_ops ipip6_netdev_ops = { 1394 .ndo_init = ipip6_tunnel_init, 1395 .ndo_uninit = ipip6_tunnel_uninit, 1396 .ndo_start_xmit = sit_tunnel_xmit, 1397 .ndo_siocdevprivate = ipip6_tunnel_siocdevprivate, 1398 .ndo_get_iflink = ip_tunnel_get_iflink, 1399 .ndo_tunnel_ctl = ipip6_tunnel_ctl, 1400 }; 1401 1402 static void ipip6_dev_free(struct net_device *dev) 1403 { 1404 struct ip_tunnel *tunnel = netdev_priv(dev); 1405 1406 dst_cache_destroy(&tunnel->dst_cache); 1407 } 1408 1409 #define SIT_FEATURES (NETIF_F_SG | \ 1410 NETIF_F_FRAGLIST | \ 1411 NETIF_F_HIGHDMA | \ 1412 NETIF_F_GSO_SOFTWARE | \ 1413 NETIF_F_HW_CSUM) 1414 1415 static void ipip6_tunnel_setup(struct net_device *dev) 1416 { 1417 struct ip_tunnel *tunnel = netdev_priv(dev); 1418 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1419 1420 dev->netdev_ops = &ipip6_netdev_ops; 1421 dev->header_ops = &ip_tunnel_header_ops; 1422 dev->needs_free_netdev = true; 1423 dev->priv_destructor = ipip6_dev_free; 1424 1425 dev->type = ARPHRD_SIT; 1426 dev->mtu = ETH_DATA_LEN - t_hlen; 1427 dev->min_mtu = IPV6_MIN_MTU; 1428 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1429 dev->flags = IFF_NOARP; 1430 netif_keep_dst(dev); 1431 dev->addr_len = 4; 1432 dev->lltx = true; 1433 dev->features |= SIT_FEATURES; 1434 dev->hw_features |= SIT_FEATURES; 1435 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 1436 1437 } 1438 1439 static int ipip6_tunnel_init(struct net_device *dev) 1440 { 1441 struct ip_tunnel *tunnel = netdev_priv(dev); 1442 int err; 1443 1444 tunnel->dev = dev; 1445 strcpy(tunnel->parms.name, dev->name); 1446 1447 ipip6_tunnel_bind_dev(dev); 1448 1449 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1450 if (err) 1451 return err; 1452 1453 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL); 1454 netdev_lockdep_set_classes(dev); 1455 return 0; 1456 } 1457 1458 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1459 { 1460 struct ip_tunnel *tunnel = netdev_priv(dev); 1461 struct iphdr *iph = &tunnel->parms.iph; 1462 struct net *net = dev_net(dev); 1463 struct sit_net *sitn = net_generic(net, sit_net_id); 1464 1465 iph->version = 4; 1466 iph->protocol = IPPROTO_IPV6; 1467 iph->ihl = 5; 1468 iph->ttl = 64; 1469 1470 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1471 } 1472 1473 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1474 struct netlink_ext_ack *extack) 1475 { 1476 u8 proto; 1477 1478 if (!data || !data[IFLA_IPTUN_PROTO]) 1479 return 0; 1480 1481 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1482 if (!ipip6_valid_ip_proto(proto)) 1483 return -EINVAL; 1484 1485 return 0; 1486 } 1487 1488 static void ipip6_netlink_parms(struct nlattr *data[], 1489 struct ip_tunnel_parm_kern *parms, 1490 __u32 *fwmark) 1491 { 1492 memset(parms, 0, sizeof(*parms)); 1493 1494 parms->iph.version = 4; 1495 parms->iph.protocol = IPPROTO_IPV6; 1496 parms->iph.ihl = 5; 1497 parms->iph.ttl = 64; 1498 1499 if (!data) 1500 return; 1501 1502 ip_tunnel_netlink_parms(data, parms); 1503 1504 if (data[IFLA_IPTUN_FWMARK]) 1505 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1506 } 1507 1508 #ifdef CONFIG_IPV6_SIT_6RD 1509 /* This function returns true when 6RD attributes are present in the nl msg */ 1510 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1511 struct ip_tunnel_6rd *ip6rd) 1512 { 1513 bool ret = false; 1514 memset(ip6rd, 0, sizeof(*ip6rd)); 1515 1516 if (!data) 1517 return ret; 1518 1519 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1520 ret = true; 1521 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1522 } 1523 1524 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1525 ret = true; 1526 ip6rd->relay_prefix = 1527 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1528 } 1529 1530 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1531 ret = true; 1532 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1533 } 1534 1535 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1536 ret = true; 1537 ip6rd->relay_prefixlen = 1538 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1539 } 1540 1541 return ret; 1542 } 1543 #endif 1544 1545 static int ipip6_newlink(struct net_device *dev, 1546 struct rtnl_newlink_params *params, 1547 struct netlink_ext_ack *extack) 1548 { 1549 struct nlattr **data = params->data; 1550 struct nlattr **tb = params->tb; 1551 struct ip_tunnel *nt; 1552 struct ip_tunnel_encap ipencap; 1553 #ifdef CONFIG_IPV6_SIT_6RD 1554 struct ip_tunnel_6rd ip6rd; 1555 #endif 1556 struct net *net; 1557 int err; 1558 1559 net = params->link_net ? : dev_net(dev); 1560 nt = netdev_priv(dev); 1561 nt->net = net; 1562 1563 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) { 1564 err = ip_tunnel_encap_setup(nt, &ipencap); 1565 if (err < 0) 1566 return err; 1567 } 1568 1569 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1570 1571 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1572 return -EEXIST; 1573 1574 err = ipip6_tunnel_create(dev); 1575 if (err < 0) 1576 return err; 1577 1578 if (tb[IFLA_MTU]) { 1579 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1580 1581 if (mtu >= IPV6_MIN_MTU && 1582 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1583 dev->mtu = mtu; 1584 } 1585 1586 #ifdef CONFIG_IPV6_SIT_6RD 1587 if (ipip6_netlink_6rd_parms(data, &ip6rd)) { 1588 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1589 if (err < 0) 1590 unregister_netdevice_queue(dev, NULL); 1591 } 1592 #endif 1593 1594 return err; 1595 } 1596 1597 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1598 struct nlattr *data[], 1599 struct netlink_ext_ack *extack) 1600 { 1601 struct ip_tunnel *t = netdev_priv(dev); 1602 struct ip_tunnel_encap ipencap; 1603 struct ip_tunnel_parm_kern p; 1604 struct net *net = t->net; 1605 struct sit_net *sitn = net_generic(net, sit_net_id); 1606 #ifdef CONFIG_IPV6_SIT_6RD 1607 struct ip_tunnel_6rd ip6rd; 1608 #endif 1609 __u32 fwmark = t->fwmark; 1610 int err; 1611 1612 if (dev == sitn->fb_tunnel_dev) 1613 return -EINVAL; 1614 1615 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) { 1616 err = ip_tunnel_encap_setup(t, &ipencap); 1617 if (err < 0) 1618 return err; 1619 } 1620 1621 ipip6_netlink_parms(data, &p, &fwmark); 1622 1623 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1624 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1625 return -EINVAL; 1626 1627 t = ipip6_tunnel_locate(net, &p, 0); 1628 1629 if (t) { 1630 if (t->dev != dev) 1631 return -EEXIST; 1632 } else 1633 t = netdev_priv(dev); 1634 1635 ipip6_tunnel_update(t, &p, fwmark); 1636 1637 #ifdef CONFIG_IPV6_SIT_6RD 1638 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1639 return ipip6_tunnel_update_6rd(t, &ip6rd); 1640 #endif 1641 1642 return 0; 1643 } 1644 1645 static size_t ipip6_get_size(const struct net_device *dev) 1646 { 1647 return 1648 /* IFLA_IPTUN_LINK */ 1649 nla_total_size(4) + 1650 /* IFLA_IPTUN_LOCAL */ 1651 nla_total_size(4) + 1652 /* IFLA_IPTUN_REMOTE */ 1653 nla_total_size(4) + 1654 /* IFLA_IPTUN_TTL */ 1655 nla_total_size(1) + 1656 /* IFLA_IPTUN_TOS */ 1657 nla_total_size(1) + 1658 /* IFLA_IPTUN_PMTUDISC */ 1659 nla_total_size(1) + 1660 /* IFLA_IPTUN_FLAGS */ 1661 nla_total_size(2) + 1662 /* IFLA_IPTUN_PROTO */ 1663 nla_total_size(1) + 1664 #ifdef CONFIG_IPV6_SIT_6RD 1665 /* IFLA_IPTUN_6RD_PREFIX */ 1666 nla_total_size(sizeof(struct in6_addr)) + 1667 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1668 nla_total_size(4) + 1669 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1670 nla_total_size(2) + 1671 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1672 nla_total_size(2) + 1673 #endif 1674 /* IFLA_IPTUN_ENCAP_TYPE */ 1675 nla_total_size(2) + 1676 /* IFLA_IPTUN_ENCAP_FLAGS */ 1677 nla_total_size(2) + 1678 /* IFLA_IPTUN_ENCAP_SPORT */ 1679 nla_total_size(2) + 1680 /* IFLA_IPTUN_ENCAP_DPORT */ 1681 nla_total_size(2) + 1682 /* IFLA_IPTUN_FWMARK */ 1683 nla_total_size(4) + 1684 0; 1685 } 1686 1687 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1688 { 1689 struct ip_tunnel *tunnel = netdev_priv(dev); 1690 struct ip_tunnel_parm_kern *parm = &tunnel->parms; 1691 1692 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1693 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1694 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1695 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1696 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1697 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1698 !!(parm->iph.frag_off & htons(IP_DF))) || 1699 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1700 nla_put_be16(skb, IFLA_IPTUN_FLAGS, 1701 ip_tunnel_flags_to_be16(parm->i_flags)) || 1702 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1703 goto nla_put_failure; 1704 1705 #ifdef CONFIG_IPV6_SIT_6RD 1706 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1707 &tunnel->ip6rd.prefix) || 1708 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1709 tunnel->ip6rd.relay_prefix) || 1710 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1711 tunnel->ip6rd.prefixlen) || 1712 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1713 tunnel->ip6rd.relay_prefixlen)) 1714 goto nla_put_failure; 1715 #endif 1716 1717 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1718 tunnel->encap.type) || 1719 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1720 tunnel->encap.sport) || 1721 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1722 tunnel->encap.dport) || 1723 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1724 tunnel->encap.flags)) 1725 goto nla_put_failure; 1726 1727 return 0; 1728 1729 nla_put_failure: 1730 return -EMSGSIZE; 1731 } 1732 1733 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1734 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1735 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1736 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1737 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1738 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1739 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1740 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1741 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1742 #ifdef CONFIG_IPV6_SIT_6RD 1743 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1744 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1745 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1746 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1747 #endif 1748 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1749 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1750 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1751 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1752 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1753 }; 1754 1755 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1756 { 1757 struct net *net = dev_net(dev); 1758 struct sit_net *sitn = net_generic(net, sit_net_id); 1759 1760 if (dev != sitn->fb_tunnel_dev) 1761 unregister_netdevice_queue(dev, head); 1762 } 1763 1764 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1765 .kind = "sit", 1766 .maxtype = IFLA_IPTUN_MAX, 1767 .policy = ipip6_policy, 1768 .priv_size = sizeof(struct ip_tunnel), 1769 .setup = ipip6_tunnel_setup, 1770 .validate = ipip6_validate, 1771 .newlink = ipip6_newlink, 1772 .changelink = ipip6_changelink, 1773 .get_size = ipip6_get_size, 1774 .fill_info = ipip6_fill_info, 1775 .dellink = ipip6_dellink, 1776 .get_link_net = ip_tunnel_get_link_net, 1777 }; 1778 1779 static struct xfrm_tunnel sit_handler __read_mostly = { 1780 .handler = ipip6_rcv, 1781 .err_handler = ipip6_err, 1782 .priority = 1, 1783 }; 1784 1785 static struct xfrm_tunnel ipip_handler __read_mostly = { 1786 .handler = ipip_rcv, 1787 .err_handler = ipip6_err, 1788 .priority = 2, 1789 }; 1790 1791 #if IS_ENABLED(CONFIG_MPLS) 1792 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1793 .handler = mplsip_rcv, 1794 .err_handler = ipip6_err, 1795 .priority = 2, 1796 }; 1797 #endif 1798 1799 static void __net_exit sit_exit_rtnl_net(struct net *net, struct list_head *head) 1800 { 1801 struct sit_net *sitn = net_generic(net, sit_net_id); 1802 struct net_device *dev, *aux; 1803 int prio; 1804 1805 for_each_netdev_safe(net, dev, aux) 1806 if (dev->rtnl_link_ops == &sit_link_ops) 1807 unregister_netdevice_queue(dev, head); 1808 1809 for (prio = 0; prio < 4; prio++) { 1810 int h; 1811 for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) { 1812 struct ip_tunnel *t; 1813 1814 t = rtnl_net_dereference(net, sitn->tunnels[prio][h]); 1815 while (t) { 1816 /* If dev is in the same netns, it has already 1817 * been added to the list by the previous loop. 1818 */ 1819 if (!net_eq(dev_net(t->dev), net)) 1820 unregister_netdevice_queue(t->dev, head); 1821 1822 t = rtnl_net_dereference(net, t->next); 1823 } 1824 } 1825 } 1826 } 1827 1828 static int __net_init sit_init_net(struct net *net) 1829 { 1830 struct sit_net *sitn = net_generic(net, sit_net_id); 1831 struct ip_tunnel *t; 1832 int err; 1833 1834 sitn->tunnels[0] = sitn->tunnels_wc; 1835 sitn->tunnels[1] = sitn->tunnels_l; 1836 sitn->tunnels[2] = sitn->tunnels_r; 1837 sitn->tunnels[3] = sitn->tunnels_r_l; 1838 1839 if (!net_has_fallback_tunnels(net)) 1840 return 0; 1841 1842 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1843 NET_NAME_UNKNOWN, 1844 ipip6_tunnel_setup); 1845 if (!sitn->fb_tunnel_dev) { 1846 err = -ENOMEM; 1847 goto err_alloc_dev; 1848 } 1849 dev_net_set(sitn->fb_tunnel_dev, net); 1850 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1851 /* FB netdevice is special: we have one, and only one per netns. 1852 * Allowing to move it to another netns is clearly unsafe. 1853 */ 1854 sitn->fb_tunnel_dev->netns_immutable = true; 1855 1856 t = netdev_priv(sitn->fb_tunnel_dev); 1857 t->net = net; 1858 1859 err = register_netdev(sitn->fb_tunnel_dev); 1860 if (err) 1861 goto err_reg_dev; 1862 1863 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1864 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1865 1866 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1867 return 0; 1868 1869 err_reg_dev: 1870 free_netdev(sitn->fb_tunnel_dev); 1871 err_alloc_dev: 1872 return err; 1873 } 1874 1875 static struct pernet_operations sit_net_ops = { 1876 .init = sit_init_net, 1877 .exit_rtnl = sit_exit_rtnl_net, 1878 .id = &sit_net_id, 1879 .size = sizeof(struct sit_net), 1880 }; 1881 1882 static void __exit sit_cleanup(void) 1883 { 1884 rtnl_link_unregister(&sit_link_ops); 1885 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1886 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1887 #if IS_ENABLED(CONFIG_MPLS) 1888 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1889 #endif 1890 1891 unregister_pernet_device(&sit_net_ops); 1892 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1893 } 1894 1895 static int __init sit_init(void) 1896 { 1897 int err; 1898 1899 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1900 1901 err = register_pernet_device(&sit_net_ops); 1902 if (err < 0) 1903 return err; 1904 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1905 if (err < 0) { 1906 pr_info("%s: can't register ip6ip4\n", __func__); 1907 goto xfrm_tunnel_failed; 1908 } 1909 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1910 if (err < 0) { 1911 pr_info("%s: can't register ip4ip4\n", __func__); 1912 goto xfrm_tunnel4_failed; 1913 } 1914 #if IS_ENABLED(CONFIG_MPLS) 1915 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1916 if (err < 0) { 1917 pr_info("%s: can't register mplsip\n", __func__); 1918 goto xfrm_tunnel_mpls_failed; 1919 } 1920 #endif 1921 err = rtnl_link_register(&sit_link_ops); 1922 if (err < 0) 1923 goto rtnl_link_failed; 1924 1925 out: 1926 return err; 1927 1928 rtnl_link_failed: 1929 #if IS_ENABLED(CONFIG_MPLS) 1930 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1931 xfrm_tunnel_mpls_failed: 1932 #endif 1933 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1934 xfrm_tunnel4_failed: 1935 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1936 xfrm_tunnel_failed: 1937 unregister_pernet_device(&sit_net_ops); 1938 goto out; 1939 } 1940 1941 module_init(sit_init); 1942 module_exit(sit_cleanup); 1943 MODULE_DESCRIPTION("IPv6-in-IPv4 tunnel SIT driver"); 1944 MODULE_LICENSE("GPL"); 1945 MODULE_ALIAS_RTNL_LINK("sit"); 1946 MODULE_ALIAS_NETDEV("sit0"); 1947