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 /* 852 * This function assumes it is being called from dev_queue_xmit() 853 * and that skb is filled properly by that function. 854 */ 855 856 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 857 struct net_device *dev) 858 { 859 struct ip_tunnel *tunnel = netdev_priv(dev); 860 const struct iphdr *tiph = &tunnel->parms.iph; 861 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 862 u8 tos = tunnel->parms.iph.tos; 863 __be16 df = tiph->frag_off; 864 struct rtable *rt; /* Route to the other host */ 865 struct net_device *tdev; /* Device to other host */ 866 unsigned int max_headroom; /* The extra header space needed */ 867 __be32 dst = tiph->daddr; 868 struct flowi4 fl4; 869 int mtu; 870 const struct in6_addr *addr6; 871 int addr_type; 872 u8 ttl; 873 u8 protocol = IPPROTO_IPV6; 874 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 875 876 if (tos == 1) 877 tos = ipv6_get_dsfield(iph6); 878 879 /* ISATAP (RFC4214) - must come before 6to4 */ 880 if (dev->priv_flags & IFF_ISATAP) { 881 struct neighbour *neigh = NULL; 882 bool do_tx_error = false; 883 884 if (skb_dst(skb)) 885 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 886 887 if (!neigh) { 888 net_dbg_ratelimited("nexthop == NULL\n"); 889 goto tx_error; 890 } 891 892 addr6 = (const struct in6_addr *)&neigh->primary_key; 893 addr_type = ipv6_addr_type(addr6); 894 895 if ((addr_type & IPV6_ADDR_UNICAST) && 896 ipv6_addr_is_isatap(addr6)) 897 dst = addr6->s6_addr32[3]; 898 else 899 do_tx_error = true; 900 901 neigh_release(neigh); 902 if (do_tx_error) 903 goto tx_error; 904 } 905 906 if (!dst) 907 dst = try_6rd(tunnel, &iph6->daddr); 908 909 if (!dst) { 910 struct neighbour *neigh = NULL; 911 bool do_tx_error = false; 912 913 if (skb_dst(skb)) 914 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 915 916 if (!neigh) { 917 net_dbg_ratelimited("nexthop == NULL\n"); 918 goto tx_error; 919 } 920 921 addr6 = (const struct in6_addr *)&neigh->primary_key; 922 addr_type = ipv6_addr_type(addr6); 923 924 if (addr_type == IPV6_ADDR_ANY) { 925 addr6 = &ipv6_hdr(skb)->daddr; 926 addr_type = ipv6_addr_type(addr6); 927 } 928 929 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 930 dst = addr6->s6_addr32[3]; 931 else 932 do_tx_error = true; 933 934 neigh_release(neigh); 935 if (do_tx_error) 936 goto tx_error; 937 } 938 939 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 940 tos & INET_DSCP_MASK, RT_SCOPE_UNIVERSE, 941 IPPROTO_IPV6, 0, dst, tiph->saddr, 0, 0, 942 sock_net_uid(tunnel->net, NULL)); 943 944 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); 945 if (!rt) { 946 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 947 if (IS_ERR(rt)) { 948 DEV_STATS_INC(dev, tx_carrier_errors); 949 goto tx_error_icmp; 950 } 951 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); 952 } 953 954 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { 955 ip_rt_put(rt); 956 DEV_STATS_INC(dev, tx_carrier_errors); 957 goto tx_error_icmp; 958 } 959 tdev = rt->dst.dev; 960 961 if (tdev == dev) { 962 ip_rt_put(rt); 963 DEV_STATS_INC(dev, collisions); 964 goto tx_error; 965 } 966 967 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 968 ip_rt_put(rt); 969 goto tx_error; 970 } 971 972 if (df) { 973 mtu = dst_mtu(&rt->dst) - t_hlen; 974 975 if (mtu < IPV4_MIN_MTU) { 976 DEV_STATS_INC(dev, collisions); 977 ip_rt_put(rt); 978 goto tx_error; 979 } 980 981 if (mtu < IPV6_MIN_MTU) { 982 mtu = IPV6_MIN_MTU; 983 df = 0; 984 } 985 986 if (tunnel->parms.iph.daddr) 987 skb_dst_update_pmtu_no_confirm(skb, mtu); 988 989 if (skb->len > mtu && !skb_is_gso(skb)) { 990 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 991 ip_rt_put(rt); 992 goto tx_error; 993 } 994 } 995 996 if (tunnel->err_count > 0) { 997 if (time_before(jiffies, 998 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 999 tunnel->err_count--; 1000 dst_link_failure(skb); 1001 } else 1002 tunnel->err_count = 0; 1003 } 1004 1005 /* 1006 * Okay, now see if we can stuff it in the buffer as-is. 1007 */ 1008 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 1009 1010 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1011 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1012 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 1013 if (!new_skb) { 1014 ip_rt_put(rt); 1015 DEV_STATS_INC(dev, tx_dropped); 1016 kfree_skb(skb); 1017 return NETDEV_TX_OK; 1018 } 1019 if (skb->sk) 1020 skb_set_owner_w(new_skb, skb->sk); 1021 dev_kfree_skb(skb); 1022 skb = new_skb; 1023 iph6 = ipv6_hdr(skb); 1024 } 1025 ttl = tiph->ttl; 1026 if (ttl == 0) 1027 ttl = iph6->hop_limit; 1028 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 1029 1030 if (ip_tunnel_encap(skb, &tunnel->encap, &protocol, &fl4) < 0) { 1031 ip_rt_put(rt); 1032 goto tx_error; 1033 } 1034 1035 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1036 1037 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 1038 df, !net_eq(tunnel->net, dev_net(dev))); 1039 return NETDEV_TX_OK; 1040 1041 tx_error_icmp: 1042 dst_link_failure(skb); 1043 tx_error: 1044 kfree_skb(skb); 1045 DEV_STATS_INC(dev, tx_errors); 1046 return NETDEV_TX_OK; 1047 } 1048 1049 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1050 struct net_device *dev, u8 ipproto) 1051 { 1052 struct ip_tunnel *tunnel = netdev_priv(dev); 1053 const struct iphdr *tiph = &tunnel->parms.iph; 1054 1055 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1056 goto tx_error; 1057 1058 skb_set_inner_ipproto(skb, ipproto); 1059 1060 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1061 return NETDEV_TX_OK; 1062 tx_error: 1063 kfree_skb(skb); 1064 DEV_STATS_INC(dev, tx_errors); 1065 return NETDEV_TX_OK; 1066 } 1067 1068 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1069 struct net_device *dev) 1070 { 1071 if (!pskb_inet_may_pull(skb)) 1072 goto tx_err; 1073 1074 switch (skb->protocol) { 1075 case htons(ETH_P_IP): 1076 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1077 break; 1078 case htons(ETH_P_IPV6): 1079 ipip6_tunnel_xmit(skb, dev); 1080 break; 1081 #if IS_ENABLED(CONFIG_MPLS) 1082 case htons(ETH_P_MPLS_UC): 1083 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1084 break; 1085 #endif 1086 default: 1087 goto tx_err; 1088 } 1089 1090 return NETDEV_TX_OK; 1091 1092 tx_err: 1093 DEV_STATS_INC(dev, tx_errors); 1094 kfree_skb(skb); 1095 return NETDEV_TX_OK; 1096 1097 } 1098 1099 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1100 { 1101 struct ip_tunnel *tunnel = netdev_priv(dev); 1102 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1103 struct net_device *tdev = NULL; 1104 int hlen = LL_MAX_HEADER; 1105 const struct iphdr *iph; 1106 struct flowi4 fl4; 1107 1108 iph = &tunnel->parms.iph; 1109 1110 if (iph->daddr) { 1111 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1112 NULL, 1113 iph->daddr, iph->saddr, 1114 0, 0, 1115 IPPROTO_IPV6, 1116 iph->tos & INET_DSCP_MASK, 1117 tunnel->parms.link); 1118 1119 if (!IS_ERR(rt)) { 1120 tdev = rt->dst.dev; 1121 ip_rt_put(rt); 1122 } 1123 dev->flags |= IFF_POINTOPOINT; 1124 } 1125 1126 if (!tdev && tunnel->parms.link) 1127 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1128 1129 if (tdev && !netif_is_l3_master(tdev)) { 1130 int mtu; 1131 1132 mtu = tdev->mtu - t_hlen; 1133 if (mtu < IPV6_MIN_MTU) 1134 mtu = IPV6_MIN_MTU; 1135 WRITE_ONCE(dev->mtu, mtu); 1136 hlen = tdev->hard_header_len + tdev->needed_headroom; 1137 } 1138 dev->needed_headroom = t_hlen + hlen; 1139 } 1140 1141 static void ipip6_tunnel_update(struct ip_tunnel *t, 1142 struct ip_tunnel_parm_kern *p, 1143 __u32 fwmark) 1144 { 1145 struct net *net = t->net; 1146 struct sit_net *sitn = net_generic(net, sit_net_id); 1147 1148 ipip6_tunnel_unlink(sitn, t); 1149 synchronize_net(); 1150 t->parms.iph.saddr = p->iph.saddr; 1151 t->parms.iph.daddr = p->iph.daddr; 1152 __dev_addr_set(t->dev, &p->iph.saddr, 4); 1153 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1154 ipip6_tunnel_link(sitn, t); 1155 t->parms.iph.ttl = p->iph.ttl; 1156 t->parms.iph.tos = p->iph.tos; 1157 t->parms.iph.frag_off = p->iph.frag_off; 1158 if (t->parms.link != p->link || t->fwmark != fwmark) { 1159 t->parms.link = p->link; 1160 t->fwmark = fwmark; 1161 ipip6_tunnel_bind_dev(t->dev); 1162 } 1163 dst_cache_reset(&t->dst_cache); 1164 netdev_state_change(t->dev); 1165 } 1166 1167 #ifdef CONFIG_IPV6_SIT_6RD 1168 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1169 struct ip_tunnel_6rd *ip6rd) 1170 { 1171 struct in6_addr prefix; 1172 __be32 relay_prefix; 1173 1174 if (ip6rd->relay_prefixlen > 32 || 1175 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1176 return -EINVAL; 1177 1178 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1179 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1180 return -EINVAL; 1181 if (ip6rd->relay_prefixlen) 1182 relay_prefix = ip6rd->relay_prefix & 1183 htonl(0xffffffffUL << 1184 (32 - ip6rd->relay_prefixlen)); 1185 else 1186 relay_prefix = 0; 1187 if (relay_prefix != ip6rd->relay_prefix) 1188 return -EINVAL; 1189 1190 t->ip6rd.prefix = prefix; 1191 t->ip6rd.relay_prefix = relay_prefix; 1192 t->ip6rd.prefixlen = ip6rd->prefixlen; 1193 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1194 dst_cache_reset(&t->dst_cache); 1195 netdev_state_change(t->dev); 1196 return 0; 1197 } 1198 1199 static int 1200 ipip6_tunnel_get6rd(struct net_device *dev, struct ip_tunnel_parm __user *data) 1201 { 1202 struct ip_tunnel *t = netdev_priv(dev); 1203 struct ip_tunnel_parm_kern p; 1204 struct ip_tunnel_6rd ip6rd; 1205 1206 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1207 if (!ip_tunnel_parm_from_user(&p, data)) 1208 return -EFAULT; 1209 t = ipip6_tunnel_locate(t->net, &p, 0); 1210 } 1211 if (!t) 1212 t = netdev_priv(dev); 1213 1214 ip6rd.prefix = t->ip6rd.prefix; 1215 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1216 ip6rd.prefixlen = t->ip6rd.prefixlen; 1217 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1218 if (copy_to_user(data, &ip6rd, sizeof(ip6rd))) 1219 return -EFAULT; 1220 return 0; 1221 } 1222 1223 static int 1224 ipip6_tunnel_6rdctl(struct net_device *dev, struct ip_tunnel_6rd __user *data, 1225 int cmd) 1226 { 1227 struct ip_tunnel *t = netdev_priv(dev); 1228 struct ip_tunnel_6rd ip6rd; 1229 int err; 1230 1231 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1232 return -EPERM; 1233 if (copy_from_user(&ip6rd, data, sizeof(ip6rd))) 1234 return -EFAULT; 1235 1236 if (cmd != SIOCDEL6RD) { 1237 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1238 if (err < 0) 1239 return err; 1240 } else 1241 ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev)); 1242 return 0; 1243 } 1244 1245 #endif /* CONFIG_IPV6_SIT_6RD */ 1246 1247 static bool ipip6_valid_ip_proto(u8 ipproto) 1248 { 1249 return ipproto == IPPROTO_IPV6 || 1250 ipproto == IPPROTO_IPIP || 1251 #if IS_ENABLED(CONFIG_MPLS) 1252 ipproto == IPPROTO_MPLS || 1253 #endif 1254 ipproto == 0; 1255 } 1256 1257 static int 1258 __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm_kern *p) 1259 { 1260 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1261 return -EPERM; 1262 1263 if (!ipip6_valid_ip_proto(p->iph.protocol)) 1264 return -EINVAL; 1265 if (p->iph.version != 4 || 1266 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) 1267 return -EINVAL; 1268 1269 if (p->iph.ttl) 1270 p->iph.frag_off |= htons(IP_DF); 1271 return 0; 1272 } 1273 1274 static int 1275 ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm_kern *p) 1276 { 1277 struct ip_tunnel *t = netdev_priv(dev); 1278 1279 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 1280 t = ipip6_tunnel_locate(t->net, p, 0); 1281 if (!t) 1282 t = netdev_priv(dev); 1283 memcpy(p, &t->parms, sizeof(*p)); 1284 return 0; 1285 } 1286 1287 static int 1288 ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm_kern *p) 1289 { 1290 struct ip_tunnel *t = netdev_priv(dev); 1291 int err; 1292 1293 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1294 if (err) 1295 return err; 1296 1297 t = ipip6_tunnel_locate(t->net, p, 1); 1298 if (!t) 1299 return -ENOBUFS; 1300 return 0; 1301 } 1302 1303 static int 1304 ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm_kern *p) 1305 { 1306 struct ip_tunnel *t = netdev_priv(dev); 1307 int err; 1308 1309 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1310 if (err) 1311 return err; 1312 1313 t = ipip6_tunnel_locate(t->net, p, 0); 1314 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1315 if (!t) 1316 return -ENOENT; 1317 } else { 1318 if (t) { 1319 if (t->dev != dev) 1320 return -EEXIST; 1321 } else { 1322 if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) || 1323 (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr)) 1324 return -EINVAL; 1325 t = netdev_priv(dev); 1326 } 1327 1328 ipip6_tunnel_update(t, p, t->fwmark); 1329 } 1330 1331 return 0; 1332 } 1333 1334 static int 1335 ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm_kern *p) 1336 { 1337 struct ip_tunnel *t = netdev_priv(dev); 1338 1339 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1340 return -EPERM; 1341 1342 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1343 t = ipip6_tunnel_locate(t->net, p, 0); 1344 if (!t) 1345 return -ENOENT; 1346 if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev)) 1347 return -EPERM; 1348 dev = t->dev; 1349 } 1350 unregister_netdevice(dev); 1351 return 0; 1352 } 1353 1354 static int 1355 ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, 1356 int cmd) 1357 { 1358 switch (cmd) { 1359 case SIOCGETTUNNEL: 1360 return ipip6_tunnel_get(dev, p); 1361 case SIOCADDTUNNEL: 1362 return ipip6_tunnel_add(dev, p); 1363 case SIOCCHGTUNNEL: 1364 return ipip6_tunnel_change(dev, p); 1365 case SIOCDELTUNNEL: 1366 return ipip6_tunnel_del(dev, p); 1367 default: 1368 return -EINVAL; 1369 } 1370 } 1371 1372 static int 1373 ipip6_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 1374 void __user *data, int cmd) 1375 { 1376 switch (cmd) { 1377 case SIOCGETTUNNEL: 1378 case SIOCADDTUNNEL: 1379 case SIOCCHGTUNNEL: 1380 case SIOCDELTUNNEL: 1381 return ip_tunnel_siocdevprivate(dev, ifr, data, cmd); 1382 case SIOCGETPRL: 1383 return ipip6_tunnel_get_prl(dev, data); 1384 case SIOCADDPRL: 1385 case SIOCDELPRL: 1386 case SIOCCHGPRL: 1387 return ipip6_tunnel_prl_ctl(dev, data, cmd); 1388 #ifdef CONFIG_IPV6_SIT_6RD 1389 case SIOCGET6RD: 1390 return ipip6_tunnel_get6rd(dev, data); 1391 case SIOCADD6RD: 1392 case SIOCCHG6RD: 1393 case SIOCDEL6RD: 1394 return ipip6_tunnel_6rdctl(dev, data, cmd); 1395 #endif 1396 default: 1397 return -EINVAL; 1398 } 1399 } 1400 1401 static const struct net_device_ops ipip6_netdev_ops = { 1402 .ndo_init = ipip6_tunnel_init, 1403 .ndo_uninit = ipip6_tunnel_uninit, 1404 .ndo_start_xmit = sit_tunnel_xmit, 1405 .ndo_siocdevprivate = ipip6_tunnel_siocdevprivate, 1406 .ndo_get_iflink = ip_tunnel_get_iflink, 1407 .ndo_tunnel_ctl = ipip6_tunnel_ctl, 1408 }; 1409 1410 static void ipip6_dev_free(struct net_device *dev) 1411 { 1412 struct ip_tunnel *tunnel = netdev_priv(dev); 1413 1414 dst_cache_destroy(&tunnel->dst_cache); 1415 } 1416 1417 #define SIT_FEATURES (NETIF_F_SG | \ 1418 NETIF_F_FRAGLIST | \ 1419 NETIF_F_HIGHDMA | \ 1420 NETIF_F_GSO_SOFTWARE | \ 1421 NETIF_F_HW_CSUM) 1422 1423 static void ipip6_tunnel_setup(struct net_device *dev) 1424 { 1425 struct ip_tunnel *tunnel = netdev_priv(dev); 1426 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1427 1428 dev->netdev_ops = &ipip6_netdev_ops; 1429 dev->header_ops = &ip_tunnel_header_ops; 1430 dev->needs_free_netdev = true; 1431 dev->priv_destructor = ipip6_dev_free; 1432 1433 dev->type = ARPHRD_SIT; 1434 dev->mtu = ETH_DATA_LEN - t_hlen; 1435 dev->min_mtu = IPV6_MIN_MTU; 1436 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1437 dev->flags = IFF_NOARP; 1438 netif_keep_dst(dev); 1439 dev->addr_len = 4; 1440 dev->lltx = true; 1441 dev->features |= SIT_FEATURES; 1442 dev->hw_features |= SIT_FEATURES; 1443 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 1444 1445 } 1446 1447 static int ipip6_tunnel_init(struct net_device *dev) 1448 { 1449 struct ip_tunnel *tunnel = netdev_priv(dev); 1450 int err; 1451 1452 tunnel->dev = dev; 1453 strcpy(tunnel->parms.name, dev->name); 1454 1455 ipip6_tunnel_bind_dev(dev); 1456 1457 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1458 if (err) 1459 return err; 1460 1461 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL); 1462 netdev_lockdep_set_classes(dev); 1463 return 0; 1464 } 1465 1466 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1467 { 1468 struct ip_tunnel *tunnel = netdev_priv(dev); 1469 struct iphdr *iph = &tunnel->parms.iph; 1470 struct net *net = dev_net(dev); 1471 struct sit_net *sitn = net_generic(net, sit_net_id); 1472 1473 iph->version = 4; 1474 iph->protocol = IPPROTO_IPV6; 1475 iph->ihl = 5; 1476 iph->ttl = 64; 1477 1478 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1479 } 1480 1481 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1482 struct netlink_ext_ack *extack) 1483 { 1484 u8 proto; 1485 1486 if (!data || !data[IFLA_IPTUN_PROTO]) 1487 return 0; 1488 1489 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1490 if (!ipip6_valid_ip_proto(proto)) 1491 return -EINVAL; 1492 1493 return 0; 1494 } 1495 1496 static void ipip6_netlink_parms(struct nlattr *data[], 1497 struct ip_tunnel_parm_kern *parms, 1498 __u32 *fwmark) 1499 { 1500 memset(parms, 0, sizeof(*parms)); 1501 1502 parms->iph.version = 4; 1503 parms->iph.protocol = IPPROTO_IPV6; 1504 parms->iph.ihl = 5; 1505 parms->iph.ttl = 64; 1506 1507 if (!data) 1508 return; 1509 1510 ip_tunnel_netlink_parms(data, parms); 1511 1512 if (data[IFLA_IPTUN_FWMARK]) 1513 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1514 } 1515 1516 #ifdef CONFIG_IPV6_SIT_6RD 1517 /* This function returns true when 6RD attributes are present in the nl msg */ 1518 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1519 struct ip_tunnel_6rd *ip6rd) 1520 { 1521 bool ret = false; 1522 memset(ip6rd, 0, sizeof(*ip6rd)); 1523 1524 if (!data) 1525 return ret; 1526 1527 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1528 ret = true; 1529 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1530 } 1531 1532 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1533 ret = true; 1534 ip6rd->relay_prefix = 1535 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1536 } 1537 1538 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1539 ret = true; 1540 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1541 } 1542 1543 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1544 ret = true; 1545 ip6rd->relay_prefixlen = 1546 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1547 } 1548 1549 return ret; 1550 } 1551 #endif 1552 1553 static int ipip6_newlink(struct net_device *dev, 1554 struct rtnl_newlink_params *params, 1555 struct netlink_ext_ack *extack) 1556 { 1557 struct nlattr **data = params->data; 1558 struct nlattr **tb = params->tb; 1559 struct ip_tunnel *nt; 1560 struct ip_tunnel_encap ipencap; 1561 #ifdef CONFIG_IPV6_SIT_6RD 1562 struct ip_tunnel_6rd ip6rd; 1563 #endif 1564 struct net *net; 1565 int err; 1566 1567 net = params->link_net ? : dev_net(dev); 1568 nt = netdev_priv(dev); 1569 nt->net = net; 1570 1571 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) { 1572 err = ip_tunnel_encap_setup(nt, &ipencap); 1573 if (err < 0) 1574 return err; 1575 } 1576 1577 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1578 1579 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1580 return -EEXIST; 1581 1582 err = ipip6_tunnel_create(dev); 1583 if (err < 0) 1584 return err; 1585 1586 if (tb[IFLA_MTU]) { 1587 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1588 1589 if (mtu >= IPV6_MIN_MTU && 1590 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1591 dev->mtu = mtu; 1592 } 1593 1594 #ifdef CONFIG_IPV6_SIT_6RD 1595 if (ipip6_netlink_6rd_parms(data, &ip6rd)) { 1596 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1597 if (err < 0) 1598 unregister_netdevice_queue(dev, NULL); 1599 } 1600 #endif 1601 1602 return err; 1603 } 1604 1605 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1606 struct nlattr *data[], 1607 struct netlink_ext_ack *extack) 1608 { 1609 struct ip_tunnel *t = netdev_priv(dev); 1610 struct ip_tunnel_encap ipencap; 1611 struct ip_tunnel_parm_kern p; 1612 struct net *net = t->net; 1613 struct sit_net *sitn = net_generic(net, sit_net_id); 1614 #ifdef CONFIG_IPV6_SIT_6RD 1615 struct ip_tunnel_6rd ip6rd; 1616 #endif 1617 __u32 fwmark = t->fwmark; 1618 int err; 1619 1620 if (dev == sitn->fb_tunnel_dev) 1621 return -EINVAL; 1622 1623 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) { 1624 err = ip_tunnel_encap_setup(t, &ipencap); 1625 if (err < 0) 1626 return err; 1627 } 1628 1629 ipip6_netlink_parms(data, &p, &fwmark); 1630 1631 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1632 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1633 return -EINVAL; 1634 1635 t = ipip6_tunnel_locate(net, &p, 0); 1636 1637 if (t) { 1638 if (t->dev != dev) 1639 return -EEXIST; 1640 } else 1641 t = netdev_priv(dev); 1642 1643 ipip6_tunnel_update(t, &p, fwmark); 1644 1645 #ifdef CONFIG_IPV6_SIT_6RD 1646 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1647 return ipip6_tunnel_update_6rd(t, &ip6rd); 1648 #endif 1649 1650 return 0; 1651 } 1652 1653 static size_t ipip6_get_size(const struct net_device *dev) 1654 { 1655 return 1656 /* IFLA_IPTUN_LINK */ 1657 nla_total_size(4) + 1658 /* IFLA_IPTUN_LOCAL */ 1659 nla_total_size(4) + 1660 /* IFLA_IPTUN_REMOTE */ 1661 nla_total_size(4) + 1662 /* IFLA_IPTUN_TTL */ 1663 nla_total_size(1) + 1664 /* IFLA_IPTUN_TOS */ 1665 nla_total_size(1) + 1666 /* IFLA_IPTUN_PMTUDISC */ 1667 nla_total_size(1) + 1668 /* IFLA_IPTUN_FLAGS */ 1669 nla_total_size(2) + 1670 /* IFLA_IPTUN_PROTO */ 1671 nla_total_size(1) + 1672 #ifdef CONFIG_IPV6_SIT_6RD 1673 /* IFLA_IPTUN_6RD_PREFIX */ 1674 nla_total_size(sizeof(struct in6_addr)) + 1675 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1676 nla_total_size(4) + 1677 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1678 nla_total_size(2) + 1679 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1680 nla_total_size(2) + 1681 #endif 1682 /* IFLA_IPTUN_ENCAP_TYPE */ 1683 nla_total_size(2) + 1684 /* IFLA_IPTUN_ENCAP_FLAGS */ 1685 nla_total_size(2) + 1686 /* IFLA_IPTUN_ENCAP_SPORT */ 1687 nla_total_size(2) + 1688 /* IFLA_IPTUN_ENCAP_DPORT */ 1689 nla_total_size(2) + 1690 /* IFLA_IPTUN_FWMARK */ 1691 nla_total_size(4) + 1692 0; 1693 } 1694 1695 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1696 { 1697 struct ip_tunnel *tunnel = netdev_priv(dev); 1698 struct ip_tunnel_parm_kern *parm = &tunnel->parms; 1699 1700 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1701 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1702 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1703 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1704 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1705 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1706 !!(parm->iph.frag_off & htons(IP_DF))) || 1707 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1708 nla_put_be16(skb, IFLA_IPTUN_FLAGS, 1709 ip_tunnel_flags_to_be16(parm->i_flags)) || 1710 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1711 goto nla_put_failure; 1712 1713 #ifdef CONFIG_IPV6_SIT_6RD 1714 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1715 &tunnel->ip6rd.prefix) || 1716 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1717 tunnel->ip6rd.relay_prefix) || 1718 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1719 tunnel->ip6rd.prefixlen) || 1720 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1721 tunnel->ip6rd.relay_prefixlen)) 1722 goto nla_put_failure; 1723 #endif 1724 1725 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1726 tunnel->encap.type) || 1727 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1728 tunnel->encap.sport) || 1729 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1730 tunnel->encap.dport) || 1731 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1732 tunnel->encap.flags)) 1733 goto nla_put_failure; 1734 1735 return 0; 1736 1737 nla_put_failure: 1738 return -EMSGSIZE; 1739 } 1740 1741 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1742 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1743 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1744 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1745 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1746 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1747 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1748 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1749 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1750 #ifdef CONFIG_IPV6_SIT_6RD 1751 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1752 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1753 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1754 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1755 #endif 1756 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1757 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1758 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1759 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1760 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1761 }; 1762 1763 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1764 { 1765 struct net *net = dev_net(dev); 1766 struct sit_net *sitn = net_generic(net, sit_net_id); 1767 1768 if (dev != sitn->fb_tunnel_dev) 1769 unregister_netdevice_queue(dev, head); 1770 } 1771 1772 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1773 .kind = "sit", 1774 .maxtype = IFLA_IPTUN_MAX, 1775 .policy = ipip6_policy, 1776 .priv_size = sizeof(struct ip_tunnel), 1777 .setup = ipip6_tunnel_setup, 1778 .validate = ipip6_validate, 1779 .newlink = ipip6_newlink, 1780 .changelink = ipip6_changelink, 1781 .get_size = ipip6_get_size, 1782 .fill_info = ipip6_fill_info, 1783 .dellink = ipip6_dellink, 1784 .get_link_net = ip_tunnel_get_link_net, 1785 }; 1786 1787 static struct xfrm_tunnel sit_handler __read_mostly = { 1788 .handler = ipip6_rcv, 1789 .err_handler = ipip6_err, 1790 .priority = 1, 1791 }; 1792 1793 static struct xfrm_tunnel ipip_handler __read_mostly = { 1794 .handler = ipip_rcv, 1795 .err_handler = ipip6_err, 1796 .priority = 2, 1797 }; 1798 1799 #if IS_ENABLED(CONFIG_MPLS) 1800 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1801 .handler = mplsip_rcv, 1802 .err_handler = ipip6_err, 1803 .priority = 2, 1804 }; 1805 #endif 1806 1807 static void __net_exit sit_destroy_tunnels(struct net *net, 1808 struct list_head *head) 1809 { 1810 struct sit_net *sitn = net_generic(net, sit_net_id); 1811 struct net_device *dev, *aux; 1812 int prio; 1813 1814 for_each_netdev_safe(net, dev, aux) 1815 if (dev->rtnl_link_ops == &sit_link_ops) 1816 unregister_netdevice_queue(dev, head); 1817 1818 for (prio = 0; prio < 4; prio++) { 1819 int h; 1820 for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) { 1821 struct ip_tunnel *t; 1822 1823 t = rtnl_dereference(sitn->tunnels[prio][h]); 1824 while (t) { 1825 /* If dev is in the same netns, it has already 1826 * been added to the list by the previous loop. 1827 */ 1828 if (!net_eq(dev_net(t->dev), net)) 1829 unregister_netdevice_queue(t->dev, 1830 head); 1831 t = rtnl_dereference(t->next); 1832 } 1833 } 1834 } 1835 } 1836 1837 static int __net_init sit_init_net(struct net *net) 1838 { 1839 struct sit_net *sitn = net_generic(net, sit_net_id); 1840 struct ip_tunnel *t; 1841 int err; 1842 1843 sitn->tunnels[0] = sitn->tunnels_wc; 1844 sitn->tunnels[1] = sitn->tunnels_l; 1845 sitn->tunnels[2] = sitn->tunnels_r; 1846 sitn->tunnels[3] = sitn->tunnels_r_l; 1847 1848 if (!net_has_fallback_tunnels(net)) 1849 return 0; 1850 1851 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1852 NET_NAME_UNKNOWN, 1853 ipip6_tunnel_setup); 1854 if (!sitn->fb_tunnel_dev) { 1855 err = -ENOMEM; 1856 goto err_alloc_dev; 1857 } 1858 dev_net_set(sitn->fb_tunnel_dev, net); 1859 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1860 /* FB netdevice is special: we have one, and only one per netns. 1861 * Allowing to move it to another netns is clearly unsafe. 1862 */ 1863 sitn->fb_tunnel_dev->netns_immutable = true; 1864 1865 t = netdev_priv(sitn->fb_tunnel_dev); 1866 t->net = net; 1867 1868 err = register_netdev(sitn->fb_tunnel_dev); 1869 if (err) 1870 goto err_reg_dev; 1871 1872 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1873 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1874 1875 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1876 return 0; 1877 1878 err_reg_dev: 1879 free_netdev(sitn->fb_tunnel_dev); 1880 err_alloc_dev: 1881 return err; 1882 } 1883 1884 static void __net_exit sit_exit_batch_rtnl(struct list_head *net_list, 1885 struct list_head *dev_to_kill) 1886 { 1887 struct net *net; 1888 1889 ASSERT_RTNL(); 1890 list_for_each_entry(net, net_list, exit_list) 1891 sit_destroy_tunnels(net, dev_to_kill); 1892 } 1893 1894 static struct pernet_operations sit_net_ops = { 1895 .init = sit_init_net, 1896 .exit_batch_rtnl = sit_exit_batch_rtnl, 1897 .id = &sit_net_id, 1898 .size = sizeof(struct sit_net), 1899 }; 1900 1901 static void __exit sit_cleanup(void) 1902 { 1903 rtnl_link_unregister(&sit_link_ops); 1904 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1905 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1906 #if IS_ENABLED(CONFIG_MPLS) 1907 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1908 #endif 1909 1910 unregister_pernet_device(&sit_net_ops); 1911 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1912 } 1913 1914 static int __init sit_init(void) 1915 { 1916 int err; 1917 1918 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1919 1920 err = register_pernet_device(&sit_net_ops); 1921 if (err < 0) 1922 return err; 1923 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1924 if (err < 0) { 1925 pr_info("%s: can't register ip6ip4\n", __func__); 1926 goto xfrm_tunnel_failed; 1927 } 1928 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1929 if (err < 0) { 1930 pr_info("%s: can't register ip4ip4\n", __func__); 1931 goto xfrm_tunnel4_failed; 1932 } 1933 #if IS_ENABLED(CONFIG_MPLS) 1934 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1935 if (err < 0) { 1936 pr_info("%s: can't register mplsip\n", __func__); 1937 goto xfrm_tunnel_mpls_failed; 1938 } 1939 #endif 1940 err = rtnl_link_register(&sit_link_ops); 1941 if (err < 0) 1942 goto rtnl_link_failed; 1943 1944 out: 1945 return err; 1946 1947 rtnl_link_failed: 1948 #if IS_ENABLED(CONFIG_MPLS) 1949 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1950 xfrm_tunnel_mpls_failed: 1951 #endif 1952 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1953 xfrm_tunnel4_failed: 1954 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1955 xfrm_tunnel_failed: 1956 unregister_pernet_device(&sit_net_ops); 1957 goto out; 1958 } 1959 1960 module_init(sit_init); 1961 module_exit(sit_cleanup); 1962 MODULE_DESCRIPTION("IPv6-in-IPv4 tunnel SIT driver"); 1963 MODULE_LICENSE("GPL"); 1964 MODULE_ALIAS_RTNL_LINK("sit"); 1965 MODULE_ALIAS_NETDEV("sit0"); 1966