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/inet_dscp.h> 55 56 /* 57 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c 58 59 For comments look at net/ipv4/ip_gre.c --ANK 60 */ 61 62 #define IP6_SIT_HASH_SIZE 16 63 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) 64 65 static bool log_ecn_error = true; 66 module_param(log_ecn_error, bool, 0644); 67 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 68 69 static int ipip6_tunnel_init(struct net_device *dev); 70 static void ipip6_tunnel_setup(struct net_device *dev); 71 static void ipip6_dev_free(struct net_device *dev); 72 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 73 __be32 *v4dst); 74 static struct rtnl_link_ops sit_link_ops __read_mostly; 75 76 static unsigned int sit_net_id __read_mostly; 77 struct sit_net { 78 struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; 79 struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; 80 struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; 81 struct ip_tunnel __rcu *tunnels_wc[1]; 82 struct ip_tunnel __rcu **tunnels[4]; 83 84 struct net_device *fb_tunnel_dev; 85 }; 86 87 static inline struct sit_net *dev_to_sit_net(struct net_device *dev) 88 { 89 struct ip_tunnel *t = netdev_priv(dev); 90 91 return net_generic(t->net, sit_net_id); 92 } 93 94 /* 95 * Must be invoked with rcu_read_lock 96 */ 97 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, 98 struct net_device *dev, 99 __be32 remote, __be32 local, 100 int sifindex) 101 { 102 unsigned int h0 = HASH(remote); 103 unsigned int h1 = HASH(local); 104 struct ip_tunnel *t; 105 struct sit_net *sitn = net_generic(net, sit_net_id); 106 int ifindex = dev ? dev->ifindex : 0; 107 108 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { 109 if (local == t->parms.iph.saddr && 110 remote == t->parms.iph.daddr && 111 (!dev || !t->parms.link || ifindex == t->parms.link || 112 sifindex == t->parms.link) && 113 (t->dev->flags & IFF_UP)) 114 return t; 115 } 116 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { 117 if (remote == t->parms.iph.daddr && 118 (!dev || !t->parms.link || ifindex == t->parms.link || 119 sifindex == t->parms.link) && 120 (t->dev->flags & IFF_UP)) 121 return t; 122 } 123 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { 124 if (local == t->parms.iph.saddr && 125 (!dev || !t->parms.link || ifindex == t->parms.link || 126 sifindex == t->parms.link) && 127 (t->dev->flags & IFF_UP)) 128 return t; 129 } 130 t = rcu_dereference(sitn->tunnels_wc[0]); 131 if (t && (t->dev->flags & IFF_UP)) 132 return t; 133 return NULL; 134 } 135 136 static struct ip_tunnel __rcu ** 137 __ipip6_bucket(struct sit_net *sitn, struct ip_tunnel_parm_kern *parms) 138 { 139 __be32 remote = parms->iph.daddr; 140 __be32 local = parms->iph.saddr; 141 unsigned int h = 0; 142 int prio = 0; 143 144 if (remote) { 145 prio |= 2; 146 h ^= HASH(remote); 147 } 148 if (local) { 149 prio |= 1; 150 h ^= HASH(local); 151 } 152 return &sitn->tunnels[prio][h]; 153 } 154 155 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, 156 struct ip_tunnel *t) 157 { 158 return __ipip6_bucket(sitn, &t->parms); 159 } 160 161 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) 162 { 163 struct ip_tunnel __rcu **tp; 164 struct ip_tunnel *iter; 165 166 for (tp = ipip6_bucket(sitn, t); 167 (iter = rtnl_dereference(*tp)) != NULL; 168 tp = &iter->next) { 169 if (t == iter) { 170 rcu_assign_pointer(*tp, t->next); 171 break; 172 } 173 } 174 } 175 176 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) 177 { 178 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); 179 180 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 181 rcu_assign_pointer(*tp, t); 182 } 183 184 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) 185 { 186 #ifdef CONFIG_IPV6_SIT_6RD 187 struct ip_tunnel *t = netdev_priv(dev); 188 189 if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) { 190 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); 191 t->ip6rd.relay_prefix = 0; 192 t->ip6rd.prefixlen = 16; 193 t->ip6rd.relay_prefixlen = 0; 194 } else { 195 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); 196 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); 197 } 198 #endif 199 } 200 201 static int ipip6_tunnel_create(struct net_device *dev) 202 { 203 struct ip_tunnel *t = netdev_priv(dev); 204 struct sit_net *sitn = net_generic(t->net, sit_net_id); 205 int err; 206 207 __dev_addr_set(dev, &t->parms.iph.saddr, 4); 208 memcpy(dev->broadcast, &t->parms.iph.daddr, 4); 209 210 if (test_bit(IP_TUNNEL_SIT_ISATAP_BIT, t->parms.i_flags)) 211 dev->priv_flags |= IFF_ISATAP; 212 213 dev->rtnl_link_ops = &sit_link_ops; 214 215 err = register_netdevice(dev); 216 if (err < 0) 217 goto out; 218 219 ipip6_tunnel_clone_6rd(dev, sitn); 220 221 ipip6_tunnel_link(sitn, t); 222 return 0; 223 224 out: 225 return err; 226 } 227 228 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, 229 struct ip_tunnel_parm_kern *parms, 230 int create) 231 { 232 __be32 remote = parms->iph.daddr; 233 __be32 local = parms->iph.saddr; 234 struct ip_tunnel *t, *nt; 235 struct ip_tunnel __rcu **tp; 236 struct net_device *dev; 237 char name[IFNAMSIZ]; 238 struct sit_net *sitn = net_generic(net, sit_net_id); 239 240 for (tp = __ipip6_bucket(sitn, parms); 241 (t = rtnl_dereference(*tp)) != NULL; 242 tp = &t->next) { 243 if (local == t->parms.iph.saddr && 244 remote == t->parms.iph.daddr && 245 parms->link == t->parms.link) { 246 if (create) 247 return NULL; 248 else 249 return t; 250 } 251 } 252 if (!create) 253 goto failed; 254 255 if (parms->name[0]) { 256 if (!dev_valid_name(parms->name)) 257 goto failed; 258 strscpy(name, parms->name, IFNAMSIZ); 259 } else { 260 strcpy(name, "sit%d"); 261 } 262 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 263 ipip6_tunnel_setup); 264 if (!dev) 265 return NULL; 266 267 dev_net_set(dev, net); 268 269 nt = netdev_priv(dev); 270 271 nt->net = net; 272 nt->parms = *parms; 273 if (ipip6_tunnel_create(dev) < 0) 274 goto failed_free; 275 276 if (!parms->name[0]) 277 strcpy(parms->name, dev->name); 278 279 return nt; 280 281 failed_free: 282 free_netdev(dev); 283 failed: 284 return NULL; 285 } 286 287 #define for_each_prl_rcu(start) \ 288 for (prl = rcu_dereference(start); \ 289 prl; \ 290 prl = rcu_dereference(prl->next)) 291 292 static struct ip_tunnel_prl_entry * 293 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 294 { 295 struct ip_tunnel_prl_entry *prl; 296 297 for_each_prl_rcu(t->prl) 298 if (prl->addr == addr) 299 break; 300 return prl; 301 302 } 303 304 static int ipip6_tunnel_get_prl(struct net_device *dev, struct ip_tunnel_prl __user *a) 305 { 306 struct ip_tunnel *t = netdev_priv(dev); 307 struct ip_tunnel_prl kprl, *kp; 308 struct ip_tunnel_prl_entry *prl; 309 unsigned int cmax, c = 0, ca, len; 310 int ret = 0; 311 312 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 313 return -EINVAL; 314 315 if (copy_from_user(&kprl, a, sizeof(kprl))) 316 return -EFAULT; 317 cmax = kprl.datalen / sizeof(kprl); 318 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 319 cmax = 1; 320 321 /* For simple GET or for root users, 322 * we try harder to allocate. 323 */ 324 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 325 kcalloc(cmax, sizeof(*kp), GFP_KERNEL_ACCOUNT | __GFP_NOWARN) : 326 NULL; 327 328 ca = min(t->prl_count, cmax); 329 330 if (!kp) { 331 /* We don't try hard to allocate much memory for 332 * non-root users. 333 * For root users, retry allocating enough memory for 334 * the answer. 335 */ 336 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC | __GFP_ACCOUNT | 337 __GFP_NOWARN); 338 if (!kp) { 339 ret = -ENOMEM; 340 goto out; 341 } 342 } 343 344 rcu_read_lock(); 345 for_each_prl_rcu(t->prl) { 346 if (c >= cmax) 347 break; 348 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 349 continue; 350 kp[c].addr = prl->addr; 351 kp[c].flags = prl->flags; 352 c++; 353 if (kprl.addr != htonl(INADDR_ANY)) 354 break; 355 } 356 357 rcu_read_unlock(); 358 359 len = sizeof(*kp) * c; 360 ret = 0; 361 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 362 ret = -EFAULT; 363 364 kfree(kp); 365 out: 366 return ret; 367 } 368 369 static int 370 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 371 { 372 struct ip_tunnel_prl_entry *p; 373 int err = 0; 374 375 if (a->addr == htonl(INADDR_ANY)) 376 return -EINVAL; 377 378 ASSERT_RTNL(); 379 380 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 381 if (p->addr == a->addr) { 382 if (chg) { 383 p->flags = a->flags; 384 goto out; 385 } 386 err = -EEXIST; 387 goto out; 388 } 389 } 390 391 if (chg) { 392 err = -ENXIO; 393 goto out; 394 } 395 396 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 397 if (!p) { 398 err = -ENOBUFS; 399 goto out; 400 } 401 402 p->next = t->prl; 403 p->addr = a->addr; 404 p->flags = a->flags; 405 t->prl_count++; 406 rcu_assign_pointer(t->prl, p); 407 out: 408 return err; 409 } 410 411 static void prl_list_destroy_rcu(struct rcu_head *head) 412 { 413 struct ip_tunnel_prl_entry *p, *n; 414 415 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 416 do { 417 n = rcu_dereference_protected(p->next, 1); 418 kfree(p); 419 p = n; 420 } while (p); 421 } 422 423 static int 424 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 425 { 426 struct ip_tunnel_prl_entry *x; 427 struct ip_tunnel_prl_entry __rcu **p; 428 int err = 0; 429 430 ASSERT_RTNL(); 431 432 if (a && a->addr != htonl(INADDR_ANY)) { 433 for (p = &t->prl; 434 (x = rtnl_dereference(*p)) != NULL; 435 p = &x->next) { 436 if (x->addr == a->addr) { 437 *p = x->next; 438 kfree_rcu(x, rcu_head); 439 t->prl_count--; 440 goto out; 441 } 442 } 443 err = -ENXIO; 444 } else { 445 x = rtnl_dereference(t->prl); 446 if (x) { 447 t->prl_count = 0; 448 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 449 t->prl = NULL; 450 } 451 } 452 out: 453 return err; 454 } 455 456 static int ipip6_tunnel_prl_ctl(struct net_device *dev, 457 struct ip_tunnel_prl __user *data, int cmd) 458 { 459 struct ip_tunnel *t = netdev_priv(dev); 460 struct ip_tunnel_prl prl; 461 int err; 462 463 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 464 return -EPERM; 465 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 466 return -EINVAL; 467 468 if (copy_from_user(&prl, data, sizeof(prl))) 469 return -EFAULT; 470 471 switch (cmd) { 472 case SIOCDELPRL: 473 err = ipip6_tunnel_del_prl(t, &prl); 474 break; 475 case SIOCADDPRL: 476 case SIOCCHGPRL: 477 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 478 break; 479 } 480 dst_cache_reset(&t->dst_cache); 481 netdev_state_change(dev); 482 return err; 483 } 484 485 static int 486 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 487 { 488 struct ip_tunnel_prl_entry *p; 489 int ok = 1; 490 491 rcu_read_lock(); 492 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 493 if (p) { 494 if (p->flags & PRL_DEFAULT) 495 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 496 else 497 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 498 } else { 499 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 500 501 if (ipv6_addr_is_isatap(addr6) && 502 (addr6->s6_addr32[3] == iph->saddr) && 503 ipv6_chk_prefix(addr6, t->dev)) 504 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 505 else 506 ok = 0; 507 } 508 rcu_read_unlock(); 509 return ok; 510 } 511 512 static void ipip6_tunnel_uninit(struct net_device *dev) 513 { 514 struct ip_tunnel *tunnel = netdev_priv(dev); 515 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); 516 517 if (dev == sitn->fb_tunnel_dev) { 518 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 519 } else { 520 ipip6_tunnel_unlink(sitn, tunnel); 521 ipip6_tunnel_del_prl(tunnel, NULL); 522 } 523 dst_cache_reset(&tunnel->dst_cache); 524 netdev_put(dev, &tunnel->dev_tracker); 525 } 526 527 static int ipip6_err(struct sk_buff *skb, u32 info) 528 { 529 const struct iphdr *iph = (const struct iphdr *)skb->data; 530 const int type = icmp_hdr(skb)->type; 531 const int code = icmp_hdr(skb)->code; 532 unsigned int data_len = 0; 533 struct ip_tunnel *t; 534 int sifindex; 535 int err; 536 537 switch (type) { 538 default: 539 case ICMP_PARAMETERPROB: 540 return 0; 541 542 case ICMP_DEST_UNREACH: 543 switch (code) { 544 case ICMP_SR_FAILED: 545 /* Impossible event. */ 546 return 0; 547 default: 548 /* All others are translated to HOST_UNREACH. 549 rfc2003 contains "deep thoughts" about NET_UNREACH, 550 I believe they are just ether pollution. --ANK 551 */ 552 break; 553 } 554 break; 555 case ICMP_TIME_EXCEEDED: 556 if (code != ICMP_EXC_TTL) 557 return 0; 558 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ 559 break; 560 case ICMP_REDIRECT: 561 break; 562 } 563 564 err = -ENOENT; 565 566 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 567 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 568 iph->daddr, iph->saddr, sifindex); 569 if (!t) 570 goto out; 571 572 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 573 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 574 t->parms.link, iph->protocol); 575 err = 0; 576 goto out; 577 } 578 if (type == ICMP_REDIRECT) { 579 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 580 iph->protocol); 581 err = 0; 582 goto out; 583 } 584 585 err = 0; 586 if (__in6_dev_get(skb->dev) && 587 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 588 goto out; 589 590 if (t->parms.iph.daddr == 0) 591 goto out; 592 593 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 594 goto out; 595 596 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 597 t->err_count++; 598 else 599 t->err_count = 1; 600 t->err_time = jiffies; 601 out: 602 return err; 603 } 604 605 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 606 const struct in6_addr *v6addr) 607 { 608 __be32 v4embed = 0; 609 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 610 return true; 611 return false; 612 } 613 614 /* Checks if an address matches an address on the tunnel interface. 615 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 616 * Long story: 617 * This function is called after we considered the packet as spoofed 618 * in is_spoofed_6rd. 619 * We may have a router that is doing NAT for proto 41 packets 620 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 621 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 622 * function will return true, dropping the packet. 623 * But, we can still check if is spoofed against the IP 624 * addresses associated with the interface. 625 */ 626 static bool only_dnatted(const struct ip_tunnel *tunnel, 627 const struct in6_addr *v6dst) 628 { 629 int prefix_len; 630 631 #ifdef CONFIG_IPV6_SIT_6RD 632 prefix_len = tunnel->ip6rd.prefixlen + 32 633 - tunnel->ip6rd.relay_prefixlen; 634 #else 635 prefix_len = 48; 636 #endif 637 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 638 } 639 640 /* Returns true if a packet is spoofed */ 641 static bool packet_is_spoofed(struct sk_buff *skb, 642 const struct iphdr *iph, 643 struct ip_tunnel *tunnel) 644 { 645 const struct ipv6hdr *ipv6h; 646 647 if (tunnel->dev->priv_flags & IFF_ISATAP) { 648 if (!isatap_chksrc(skb, iph, tunnel)) 649 return true; 650 651 return false; 652 } 653 654 if (tunnel->dev->flags & IFF_POINTOPOINT) 655 return false; 656 657 ipv6h = ipv6_hdr(skb); 658 659 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 660 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 661 &iph->saddr, &ipv6h->saddr, 662 &iph->daddr, &ipv6h->daddr); 663 return true; 664 } 665 666 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 667 return false; 668 669 if (only_dnatted(tunnel, &ipv6h->daddr)) 670 return false; 671 672 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 673 &iph->saddr, &ipv6h->saddr, 674 &iph->daddr, &ipv6h->daddr); 675 return true; 676 } 677 678 static int ipip6_rcv(struct sk_buff *skb) 679 { 680 const struct iphdr *iph = ip_hdr(skb); 681 struct ip_tunnel *tunnel; 682 int sifindex; 683 int err; 684 685 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 686 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 687 iph->saddr, iph->daddr, sifindex); 688 if (tunnel) { 689 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 690 tunnel->parms.iph.protocol != 0) 691 goto out; 692 693 skb->mac_header = skb->network_header; 694 skb_reset_network_header(skb); 695 IPCB(skb)->flags = 0; 696 skb->dev = tunnel->dev; 697 698 if (packet_is_spoofed(skb, iph, tunnel)) { 699 DEV_STATS_INC(tunnel->dev, rx_errors); 700 goto out; 701 } 702 703 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 704 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 705 goto out; 706 707 /* skb can be uncloned in iptunnel_pull_header, so 708 * old iph is no longer valid 709 */ 710 iph = (const struct iphdr *)skb_mac_header(skb); 711 skb_reset_mac_header(skb); 712 713 err = IP_ECN_decapsulate(iph, skb); 714 if (unlikely(err)) { 715 if (log_ecn_error) 716 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 717 &iph->saddr, iph->tos); 718 if (err > 1) { 719 DEV_STATS_INC(tunnel->dev, rx_frame_errors); 720 DEV_STATS_INC(tunnel->dev, rx_errors); 721 goto out; 722 } 723 } 724 725 dev_sw_netstats_rx_add(tunnel->dev, skb->len); 726 727 netif_rx(skb); 728 729 return 0; 730 } 731 732 /* no tunnel matched, let upstream know, ipsec may handle it */ 733 return 1; 734 out: 735 kfree_skb(skb); 736 return 0; 737 } 738 739 static const struct tnl_ptk_info ipip_tpi = { 740 /* no tunnel info required for ipip. */ 741 .proto = htons(ETH_P_IP), 742 }; 743 744 #if IS_ENABLED(CONFIG_MPLS) 745 static const struct tnl_ptk_info mplsip_tpi = { 746 /* no tunnel info required for mplsip. */ 747 .proto = htons(ETH_P_MPLS_UC), 748 }; 749 #endif 750 751 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 752 { 753 const struct iphdr *iph; 754 struct ip_tunnel *tunnel; 755 int sifindex; 756 757 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 758 759 iph = ip_hdr(skb); 760 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 761 iph->saddr, iph->daddr, sifindex); 762 if (tunnel) { 763 const struct tnl_ptk_info *tpi; 764 765 if (tunnel->parms.iph.protocol != ipproto && 766 tunnel->parms.iph.protocol != 0) 767 goto drop; 768 769 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 770 goto drop; 771 #if IS_ENABLED(CONFIG_MPLS) 772 if (ipproto == IPPROTO_MPLS) 773 tpi = &mplsip_tpi; 774 else 775 #endif 776 tpi = &ipip_tpi; 777 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 778 goto drop; 779 skb_reset_mac_header(skb); 780 781 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 782 } 783 784 return 1; 785 786 drop: 787 kfree_skb(skb); 788 return 0; 789 } 790 791 static int ipip_rcv(struct sk_buff *skb) 792 { 793 return sit_tunnel_rcv(skb, IPPROTO_IPIP); 794 } 795 796 #if IS_ENABLED(CONFIG_MPLS) 797 static int mplsip_rcv(struct sk_buff *skb) 798 { 799 return sit_tunnel_rcv(skb, IPPROTO_MPLS); 800 } 801 #endif 802 803 /* 804 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 805 * stores the embedded IPv4 address in v4dst and returns true. 806 */ 807 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 808 __be32 *v4dst) 809 { 810 #ifdef CONFIG_IPV6_SIT_6RD 811 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 812 tunnel->ip6rd.prefixlen)) { 813 unsigned int pbw0, pbi0; 814 int pbi1; 815 u32 d; 816 817 pbw0 = tunnel->ip6rd.prefixlen >> 5; 818 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 819 820 d = tunnel->ip6rd.relay_prefixlen < 32 ? 821 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 822 tunnel->ip6rd.relay_prefixlen : 0; 823 824 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 825 if (pbi1 > 0) 826 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 827 (32 - pbi1); 828 829 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 830 return true; 831 } 832 #else 833 if (v6dst->s6_addr16[0] == htons(0x2002)) { 834 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 835 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 836 return true; 837 } 838 #endif 839 return false; 840 } 841 842 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 843 const struct in6_addr *v6dst) 844 { 845 __be32 dst = 0; 846 check_6rd(tunnel, v6dst, &dst); 847 return dst; 848 } 849 850 /* 851 * This function assumes it is being called from dev_queue_xmit() 852 * and that skb is filled properly by that function. 853 */ 854 855 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 856 struct net_device *dev) 857 { 858 struct ip_tunnel *tunnel = netdev_priv(dev); 859 const struct iphdr *tiph = &tunnel->parms.iph; 860 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 861 u8 tos = tunnel->parms.iph.tos; 862 __be16 df = tiph->frag_off; 863 struct rtable *rt; /* Route to the other host */ 864 struct net_device *tdev; /* Device to other host */ 865 unsigned int max_headroom; /* The extra header space needed */ 866 __be32 dst = tiph->daddr; 867 struct flowi4 fl4; 868 int mtu; 869 const struct in6_addr *addr6; 870 int addr_type; 871 u8 ttl; 872 u8 protocol = IPPROTO_IPV6; 873 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 874 875 if (tos == 1) 876 tos = ipv6_get_dsfield(iph6); 877 878 /* ISATAP (RFC4214) - must come before 6to4 */ 879 if (dev->priv_flags & IFF_ISATAP) { 880 struct neighbour *neigh = NULL; 881 bool do_tx_error = false; 882 883 if (skb_dst(skb)) 884 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 885 886 if (!neigh) { 887 net_dbg_ratelimited("nexthop == NULL\n"); 888 goto tx_error; 889 } 890 891 addr6 = (const struct in6_addr *)&neigh->primary_key; 892 addr_type = ipv6_addr_type(addr6); 893 894 if ((addr_type & IPV6_ADDR_UNICAST) && 895 ipv6_addr_is_isatap(addr6)) 896 dst = addr6->s6_addr32[3]; 897 else 898 do_tx_error = true; 899 900 neigh_release(neigh); 901 if (do_tx_error) 902 goto tx_error; 903 } 904 905 if (!dst) 906 dst = try_6rd(tunnel, &iph6->daddr); 907 908 if (!dst) { 909 struct neighbour *neigh = NULL; 910 bool do_tx_error = false; 911 912 if (skb_dst(skb)) 913 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 914 915 if (!neigh) { 916 net_dbg_ratelimited("nexthop == NULL\n"); 917 goto tx_error; 918 } 919 920 addr6 = (const struct in6_addr *)&neigh->primary_key; 921 addr_type = ipv6_addr_type(addr6); 922 923 if (addr_type == IPV6_ADDR_ANY) { 924 addr6 = &ipv6_hdr(skb)->daddr; 925 addr_type = ipv6_addr_type(addr6); 926 } 927 928 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 929 dst = addr6->s6_addr32[3]; 930 else 931 do_tx_error = true; 932 933 neigh_release(neigh); 934 if (do_tx_error) 935 goto tx_error; 936 } 937 938 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 939 tos & INET_DSCP_MASK, RT_SCOPE_UNIVERSE, 940 IPPROTO_IPV6, 0, dst, tiph->saddr, 0, 0, 941 sock_net_uid(tunnel->net, NULL)); 942 943 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); 944 if (!rt) { 945 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 946 if (IS_ERR(rt)) { 947 DEV_STATS_INC(dev, tx_carrier_errors); 948 goto tx_error_icmp; 949 } 950 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); 951 } 952 953 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) { 954 ip_rt_put(rt); 955 DEV_STATS_INC(dev, tx_carrier_errors); 956 goto tx_error_icmp; 957 } 958 tdev = rt->dst.dev; 959 960 if (tdev == dev) { 961 ip_rt_put(rt); 962 DEV_STATS_INC(dev, collisions); 963 goto tx_error; 964 } 965 966 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 967 ip_rt_put(rt); 968 goto tx_error; 969 } 970 971 if (df) { 972 mtu = dst_mtu(&rt->dst) - t_hlen; 973 974 if (mtu < IPV4_MIN_MTU) { 975 DEV_STATS_INC(dev, collisions); 976 ip_rt_put(rt); 977 goto tx_error; 978 } 979 980 if (mtu < IPV6_MIN_MTU) { 981 mtu = IPV6_MIN_MTU; 982 df = 0; 983 } 984 985 if (tunnel->parms.iph.daddr) 986 skb_dst_update_pmtu_no_confirm(skb, mtu); 987 988 if (skb->len > mtu && !skb_is_gso(skb)) { 989 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 990 ip_rt_put(rt); 991 goto tx_error; 992 } 993 } 994 995 if (tunnel->err_count > 0) { 996 if (time_before(jiffies, 997 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 998 tunnel->err_count--; 999 dst_link_failure(skb); 1000 } else 1001 tunnel->err_count = 0; 1002 } 1003 1004 /* 1005 * Okay, now see if we can stuff it in the buffer as-is. 1006 */ 1007 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 1008 1009 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1010 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1011 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 1012 if (!new_skb) { 1013 ip_rt_put(rt); 1014 DEV_STATS_INC(dev, tx_dropped); 1015 kfree_skb(skb); 1016 return NETDEV_TX_OK; 1017 } 1018 if (skb->sk) 1019 skb_set_owner_w(new_skb, skb->sk); 1020 dev_kfree_skb(skb); 1021 skb = new_skb; 1022 iph6 = ipv6_hdr(skb); 1023 } 1024 ttl = tiph->ttl; 1025 if (ttl == 0) 1026 ttl = iph6->hop_limit; 1027 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 1028 1029 if (ip_tunnel_encap(skb, &tunnel->encap, &protocol, &fl4) < 0) { 1030 ip_rt_put(rt); 1031 goto tx_error; 1032 } 1033 1034 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1035 1036 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 1037 df, !net_eq(tunnel->net, dev_net(dev))); 1038 return NETDEV_TX_OK; 1039 1040 tx_error_icmp: 1041 dst_link_failure(skb); 1042 tx_error: 1043 kfree_skb(skb); 1044 DEV_STATS_INC(dev, tx_errors); 1045 return NETDEV_TX_OK; 1046 } 1047 1048 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1049 struct net_device *dev, u8 ipproto) 1050 { 1051 struct ip_tunnel *tunnel = netdev_priv(dev); 1052 const struct iphdr *tiph = &tunnel->parms.iph; 1053 1054 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1055 goto tx_error; 1056 1057 skb_set_inner_ipproto(skb, ipproto); 1058 1059 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1060 return NETDEV_TX_OK; 1061 tx_error: 1062 kfree_skb(skb); 1063 DEV_STATS_INC(dev, tx_errors); 1064 return NETDEV_TX_OK; 1065 } 1066 1067 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1068 struct net_device *dev) 1069 { 1070 if (!pskb_inet_may_pull(skb)) 1071 goto tx_err; 1072 1073 switch (skb->protocol) { 1074 case htons(ETH_P_IP): 1075 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1076 break; 1077 case htons(ETH_P_IPV6): 1078 ipip6_tunnel_xmit(skb, dev); 1079 break; 1080 #if IS_ENABLED(CONFIG_MPLS) 1081 case htons(ETH_P_MPLS_UC): 1082 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1083 break; 1084 #endif 1085 default: 1086 goto tx_err; 1087 } 1088 1089 return NETDEV_TX_OK; 1090 1091 tx_err: 1092 DEV_STATS_INC(dev, tx_errors); 1093 kfree_skb(skb); 1094 return NETDEV_TX_OK; 1095 1096 } 1097 1098 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1099 { 1100 struct ip_tunnel *tunnel = netdev_priv(dev); 1101 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1102 struct net_device *tdev = NULL; 1103 int hlen = LL_MAX_HEADER; 1104 const struct iphdr *iph; 1105 struct flowi4 fl4; 1106 1107 iph = &tunnel->parms.iph; 1108 1109 if (iph->daddr) { 1110 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1111 NULL, 1112 iph->daddr, iph->saddr, 1113 0, 0, 1114 IPPROTO_IPV6, 1115 iph->tos & INET_DSCP_MASK, 1116 tunnel->parms.link); 1117 1118 if (!IS_ERR(rt)) { 1119 tdev = rt->dst.dev; 1120 ip_rt_put(rt); 1121 } 1122 dev->flags |= IFF_POINTOPOINT; 1123 } 1124 1125 if (!tdev && tunnel->parms.link) 1126 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1127 1128 if (tdev && !netif_is_l3_master(tdev)) { 1129 int mtu; 1130 1131 mtu = tdev->mtu - t_hlen; 1132 if (mtu < IPV6_MIN_MTU) 1133 mtu = IPV6_MIN_MTU; 1134 WRITE_ONCE(dev->mtu, mtu); 1135 hlen = tdev->hard_header_len + tdev->needed_headroom; 1136 } 1137 dev->needed_headroom = t_hlen + hlen; 1138 } 1139 1140 static void ipip6_tunnel_update(struct ip_tunnel *t, 1141 struct ip_tunnel_parm_kern *p, 1142 __u32 fwmark) 1143 { 1144 struct net *net = t->net; 1145 struct sit_net *sitn = net_generic(net, sit_net_id); 1146 1147 ipip6_tunnel_unlink(sitn, t); 1148 synchronize_net(); 1149 t->parms.iph.saddr = p->iph.saddr; 1150 t->parms.iph.daddr = p->iph.daddr; 1151 __dev_addr_set(t->dev, &p->iph.saddr, 4); 1152 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1153 ipip6_tunnel_link(sitn, t); 1154 t->parms.iph.ttl = p->iph.ttl; 1155 t->parms.iph.tos = p->iph.tos; 1156 t->parms.iph.frag_off = p->iph.frag_off; 1157 if (t->parms.link != p->link || t->fwmark != fwmark) { 1158 t->parms.link = p->link; 1159 t->fwmark = fwmark; 1160 ipip6_tunnel_bind_dev(t->dev); 1161 } 1162 dst_cache_reset(&t->dst_cache); 1163 netdev_state_change(t->dev); 1164 } 1165 1166 #ifdef CONFIG_IPV6_SIT_6RD 1167 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1168 struct ip_tunnel_6rd *ip6rd) 1169 { 1170 struct in6_addr prefix; 1171 __be32 relay_prefix; 1172 1173 if (ip6rd->relay_prefixlen > 32 || 1174 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1175 return -EINVAL; 1176 1177 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1178 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1179 return -EINVAL; 1180 if (ip6rd->relay_prefixlen) 1181 relay_prefix = ip6rd->relay_prefix & 1182 htonl(0xffffffffUL << 1183 (32 - ip6rd->relay_prefixlen)); 1184 else 1185 relay_prefix = 0; 1186 if (relay_prefix != ip6rd->relay_prefix) 1187 return -EINVAL; 1188 1189 t->ip6rd.prefix = prefix; 1190 t->ip6rd.relay_prefix = relay_prefix; 1191 t->ip6rd.prefixlen = ip6rd->prefixlen; 1192 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1193 dst_cache_reset(&t->dst_cache); 1194 netdev_state_change(t->dev); 1195 return 0; 1196 } 1197 1198 static int 1199 ipip6_tunnel_get6rd(struct net_device *dev, struct ip_tunnel_parm __user *data) 1200 { 1201 struct ip_tunnel *t = netdev_priv(dev); 1202 struct ip_tunnel_parm_kern p; 1203 struct ip_tunnel_6rd ip6rd; 1204 1205 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1206 if (!ip_tunnel_parm_from_user(&p, data)) 1207 return -EFAULT; 1208 t = ipip6_tunnel_locate(t->net, &p, 0); 1209 } 1210 if (!t) 1211 t = netdev_priv(dev); 1212 1213 ip6rd.prefix = t->ip6rd.prefix; 1214 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1215 ip6rd.prefixlen = t->ip6rd.prefixlen; 1216 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1217 if (copy_to_user(data, &ip6rd, sizeof(ip6rd))) 1218 return -EFAULT; 1219 return 0; 1220 } 1221 1222 static int 1223 ipip6_tunnel_6rdctl(struct net_device *dev, struct ip_tunnel_6rd __user *data, 1224 int cmd) 1225 { 1226 struct ip_tunnel *t = netdev_priv(dev); 1227 struct ip_tunnel_6rd ip6rd; 1228 int err; 1229 1230 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1231 return -EPERM; 1232 if (copy_from_user(&ip6rd, data, sizeof(ip6rd))) 1233 return -EFAULT; 1234 1235 if (cmd != SIOCDEL6RD) { 1236 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1237 if (err < 0) 1238 return err; 1239 } else 1240 ipip6_tunnel_clone_6rd(dev, dev_to_sit_net(dev)); 1241 return 0; 1242 } 1243 1244 #endif /* CONFIG_IPV6_SIT_6RD */ 1245 1246 static bool ipip6_valid_ip_proto(u8 ipproto) 1247 { 1248 return ipproto == IPPROTO_IPV6 || 1249 ipproto == IPPROTO_IPIP || 1250 #if IS_ENABLED(CONFIG_MPLS) 1251 ipproto == IPPROTO_MPLS || 1252 #endif 1253 ipproto == 0; 1254 } 1255 1256 static int 1257 __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm_kern *p) 1258 { 1259 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1260 return -EPERM; 1261 1262 if (!ipip6_valid_ip_proto(p->iph.protocol)) 1263 return -EINVAL; 1264 if (p->iph.version != 4 || 1265 p->iph.ihl != 5 || (p->iph.frag_off & htons(~IP_DF))) 1266 return -EINVAL; 1267 1268 if (p->iph.ttl) 1269 p->iph.frag_off |= htons(IP_DF); 1270 return 0; 1271 } 1272 1273 static int 1274 ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm_kern *p) 1275 { 1276 struct ip_tunnel *t = netdev_priv(dev); 1277 1278 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) 1279 t = ipip6_tunnel_locate(t->net, p, 0); 1280 if (!t) 1281 t = netdev_priv(dev); 1282 memcpy(p, &t->parms, sizeof(*p)); 1283 return 0; 1284 } 1285 1286 static int 1287 ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm_kern *p) 1288 { 1289 struct ip_tunnel *t = netdev_priv(dev); 1290 int err; 1291 1292 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1293 if (err) 1294 return err; 1295 1296 t = ipip6_tunnel_locate(t->net, p, 1); 1297 if (!t) 1298 return -ENOBUFS; 1299 return 0; 1300 } 1301 1302 static int 1303 ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm_kern *p) 1304 { 1305 struct ip_tunnel *t = netdev_priv(dev); 1306 int err; 1307 1308 err = __ipip6_tunnel_ioctl_validate(t->net, p); 1309 if (err) 1310 return err; 1311 1312 t = ipip6_tunnel_locate(t->net, p, 0); 1313 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1314 if (!t) 1315 return -ENOENT; 1316 } else { 1317 if (t) { 1318 if (t->dev != dev) 1319 return -EEXIST; 1320 } else { 1321 if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) || 1322 (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr)) 1323 return -EINVAL; 1324 t = netdev_priv(dev); 1325 } 1326 1327 ipip6_tunnel_update(t, p, t->fwmark); 1328 } 1329 1330 return 0; 1331 } 1332 1333 static int 1334 ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm_kern *p) 1335 { 1336 struct ip_tunnel *t = netdev_priv(dev); 1337 1338 if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN)) 1339 return -EPERM; 1340 1341 if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) { 1342 t = ipip6_tunnel_locate(t->net, p, 0); 1343 if (!t) 1344 return -ENOENT; 1345 if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev)) 1346 return -EPERM; 1347 dev = t->dev; 1348 } 1349 unregister_netdevice(dev); 1350 return 0; 1351 } 1352 1353 static int 1354 ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm_kern *p, 1355 int cmd) 1356 { 1357 switch (cmd) { 1358 case SIOCGETTUNNEL: 1359 return ipip6_tunnel_get(dev, p); 1360 case SIOCADDTUNNEL: 1361 return ipip6_tunnel_add(dev, p); 1362 case SIOCCHGTUNNEL: 1363 return ipip6_tunnel_change(dev, p); 1364 case SIOCDELTUNNEL: 1365 return ipip6_tunnel_del(dev, p); 1366 default: 1367 return -EINVAL; 1368 } 1369 } 1370 1371 static int 1372 ipip6_tunnel_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 1373 void __user *data, int cmd) 1374 { 1375 switch (cmd) { 1376 case SIOCGETTUNNEL: 1377 case SIOCADDTUNNEL: 1378 case SIOCCHGTUNNEL: 1379 case SIOCDELTUNNEL: 1380 return ip_tunnel_siocdevprivate(dev, ifr, data, cmd); 1381 case SIOCGETPRL: 1382 return ipip6_tunnel_get_prl(dev, data); 1383 case SIOCADDPRL: 1384 case SIOCDELPRL: 1385 case SIOCCHGPRL: 1386 return ipip6_tunnel_prl_ctl(dev, data, cmd); 1387 #ifdef CONFIG_IPV6_SIT_6RD 1388 case SIOCGET6RD: 1389 return ipip6_tunnel_get6rd(dev, data); 1390 case SIOCADD6RD: 1391 case SIOCCHG6RD: 1392 case SIOCDEL6RD: 1393 return ipip6_tunnel_6rdctl(dev, data, cmd); 1394 #endif 1395 default: 1396 return -EINVAL; 1397 } 1398 } 1399 1400 static const struct net_device_ops ipip6_netdev_ops = { 1401 .ndo_init = ipip6_tunnel_init, 1402 .ndo_uninit = ipip6_tunnel_uninit, 1403 .ndo_start_xmit = sit_tunnel_xmit, 1404 .ndo_siocdevprivate = ipip6_tunnel_siocdevprivate, 1405 .ndo_get_iflink = ip_tunnel_get_iflink, 1406 .ndo_tunnel_ctl = ipip6_tunnel_ctl, 1407 }; 1408 1409 static void ipip6_dev_free(struct net_device *dev) 1410 { 1411 struct ip_tunnel *tunnel = netdev_priv(dev); 1412 1413 dst_cache_destroy(&tunnel->dst_cache); 1414 } 1415 1416 #define SIT_FEATURES (NETIF_F_SG | \ 1417 NETIF_F_FRAGLIST | \ 1418 NETIF_F_HIGHDMA | \ 1419 NETIF_F_GSO_SOFTWARE | \ 1420 NETIF_F_HW_CSUM) 1421 1422 static void ipip6_tunnel_setup(struct net_device *dev) 1423 { 1424 struct ip_tunnel *tunnel = netdev_priv(dev); 1425 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1426 1427 dev->netdev_ops = &ipip6_netdev_ops; 1428 dev->header_ops = &ip_tunnel_header_ops; 1429 dev->needs_free_netdev = true; 1430 dev->priv_destructor = ipip6_dev_free; 1431 1432 dev->type = ARPHRD_SIT; 1433 dev->mtu = ETH_DATA_LEN - t_hlen; 1434 dev->min_mtu = IPV6_MIN_MTU; 1435 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1436 dev->flags = IFF_NOARP; 1437 netif_keep_dst(dev); 1438 dev->addr_len = 4; 1439 dev->lltx = true; 1440 dev->features |= SIT_FEATURES; 1441 dev->hw_features |= SIT_FEATURES; 1442 dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS; 1443 1444 } 1445 1446 static int ipip6_tunnel_init(struct net_device *dev) 1447 { 1448 struct ip_tunnel *tunnel = netdev_priv(dev); 1449 int err; 1450 1451 tunnel->dev = dev; 1452 strcpy(tunnel->parms.name, dev->name); 1453 1454 ipip6_tunnel_bind_dev(dev); 1455 1456 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1457 if (err) 1458 return err; 1459 1460 netdev_hold(dev, &tunnel->dev_tracker, GFP_KERNEL); 1461 netdev_lockdep_set_classes(dev); 1462 return 0; 1463 } 1464 1465 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1466 { 1467 struct ip_tunnel *tunnel = netdev_priv(dev); 1468 struct iphdr *iph = &tunnel->parms.iph; 1469 struct net *net = dev_net(dev); 1470 struct sit_net *sitn = net_generic(net, sit_net_id); 1471 1472 iph->version = 4; 1473 iph->protocol = IPPROTO_IPV6; 1474 iph->ihl = 5; 1475 iph->ttl = 64; 1476 1477 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1478 } 1479 1480 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1481 struct netlink_ext_ack *extack) 1482 { 1483 u8 proto; 1484 1485 if (!data || !data[IFLA_IPTUN_PROTO]) 1486 return 0; 1487 1488 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1489 if (!ipip6_valid_ip_proto(proto)) 1490 return -EINVAL; 1491 1492 return 0; 1493 } 1494 1495 static void ipip6_netlink_parms(struct nlattr *data[], 1496 struct ip_tunnel_parm_kern *parms, 1497 __u32 *fwmark) 1498 { 1499 memset(parms, 0, sizeof(*parms)); 1500 1501 parms->iph.version = 4; 1502 parms->iph.protocol = IPPROTO_IPV6; 1503 parms->iph.ihl = 5; 1504 parms->iph.ttl = 64; 1505 1506 if (!data) 1507 return; 1508 1509 ip_tunnel_netlink_parms(data, parms); 1510 1511 if (data[IFLA_IPTUN_FWMARK]) 1512 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1513 } 1514 1515 #ifdef CONFIG_IPV6_SIT_6RD 1516 /* This function returns true when 6RD attributes are present in the nl msg */ 1517 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1518 struct ip_tunnel_6rd *ip6rd) 1519 { 1520 bool ret = false; 1521 memset(ip6rd, 0, sizeof(*ip6rd)); 1522 1523 if (!data) 1524 return ret; 1525 1526 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1527 ret = true; 1528 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1529 } 1530 1531 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1532 ret = true; 1533 ip6rd->relay_prefix = 1534 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1535 } 1536 1537 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1538 ret = true; 1539 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1540 } 1541 1542 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1543 ret = true; 1544 ip6rd->relay_prefixlen = 1545 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1546 } 1547 1548 return ret; 1549 } 1550 #endif 1551 1552 static int ipip6_newlink(struct net_device *dev, 1553 struct rtnl_newlink_params *params, 1554 struct netlink_ext_ack *extack) 1555 { 1556 struct nlattr **data = params->data; 1557 struct nlattr **tb = params->tb; 1558 struct ip_tunnel *nt; 1559 struct ip_tunnel_encap ipencap; 1560 #ifdef CONFIG_IPV6_SIT_6RD 1561 struct ip_tunnel_6rd ip6rd; 1562 #endif 1563 struct net *net; 1564 int err; 1565 1566 net = params->link_net ? : dev_net(dev); 1567 nt = netdev_priv(dev); 1568 nt->net = net; 1569 1570 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) { 1571 err = ip_tunnel_encap_setup(nt, &ipencap); 1572 if (err < 0) 1573 return err; 1574 } 1575 1576 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1577 1578 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1579 return -EEXIST; 1580 1581 err = ipip6_tunnel_create(dev); 1582 if (err < 0) 1583 return err; 1584 1585 if (tb[IFLA_MTU]) { 1586 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1587 1588 if (mtu >= IPV6_MIN_MTU && 1589 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1590 dev->mtu = mtu; 1591 } 1592 1593 #ifdef CONFIG_IPV6_SIT_6RD 1594 if (ipip6_netlink_6rd_parms(data, &ip6rd)) { 1595 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1596 if (err < 0) 1597 unregister_netdevice_queue(dev, NULL); 1598 } 1599 #endif 1600 1601 return err; 1602 } 1603 1604 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1605 struct nlattr *data[], 1606 struct netlink_ext_ack *extack) 1607 { 1608 struct ip_tunnel *t = netdev_priv(dev); 1609 struct ip_tunnel_encap ipencap; 1610 struct ip_tunnel_parm_kern p; 1611 struct net *net = t->net; 1612 struct sit_net *sitn = net_generic(net, sit_net_id); 1613 #ifdef CONFIG_IPV6_SIT_6RD 1614 struct ip_tunnel_6rd ip6rd; 1615 #endif 1616 __u32 fwmark = t->fwmark; 1617 int err; 1618 1619 if (dev == sitn->fb_tunnel_dev) 1620 return -EINVAL; 1621 1622 if (ip_tunnel_netlink_encap_parms(data, &ipencap)) { 1623 err = ip_tunnel_encap_setup(t, &ipencap); 1624 if (err < 0) 1625 return err; 1626 } 1627 1628 ipip6_netlink_parms(data, &p, &fwmark); 1629 1630 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1631 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1632 return -EINVAL; 1633 1634 t = ipip6_tunnel_locate(net, &p, 0); 1635 1636 if (t) { 1637 if (t->dev != dev) 1638 return -EEXIST; 1639 } else 1640 t = netdev_priv(dev); 1641 1642 ipip6_tunnel_update(t, &p, fwmark); 1643 1644 #ifdef CONFIG_IPV6_SIT_6RD 1645 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1646 return ipip6_tunnel_update_6rd(t, &ip6rd); 1647 #endif 1648 1649 return 0; 1650 } 1651 1652 static size_t ipip6_get_size(const struct net_device *dev) 1653 { 1654 return 1655 /* IFLA_IPTUN_LINK */ 1656 nla_total_size(4) + 1657 /* IFLA_IPTUN_LOCAL */ 1658 nla_total_size(4) + 1659 /* IFLA_IPTUN_REMOTE */ 1660 nla_total_size(4) + 1661 /* IFLA_IPTUN_TTL */ 1662 nla_total_size(1) + 1663 /* IFLA_IPTUN_TOS */ 1664 nla_total_size(1) + 1665 /* IFLA_IPTUN_PMTUDISC */ 1666 nla_total_size(1) + 1667 /* IFLA_IPTUN_FLAGS */ 1668 nla_total_size(2) + 1669 /* IFLA_IPTUN_PROTO */ 1670 nla_total_size(1) + 1671 #ifdef CONFIG_IPV6_SIT_6RD 1672 /* IFLA_IPTUN_6RD_PREFIX */ 1673 nla_total_size(sizeof(struct in6_addr)) + 1674 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1675 nla_total_size(4) + 1676 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1677 nla_total_size(2) + 1678 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1679 nla_total_size(2) + 1680 #endif 1681 /* IFLA_IPTUN_ENCAP_TYPE */ 1682 nla_total_size(2) + 1683 /* IFLA_IPTUN_ENCAP_FLAGS */ 1684 nla_total_size(2) + 1685 /* IFLA_IPTUN_ENCAP_SPORT */ 1686 nla_total_size(2) + 1687 /* IFLA_IPTUN_ENCAP_DPORT */ 1688 nla_total_size(2) + 1689 /* IFLA_IPTUN_FWMARK */ 1690 nla_total_size(4) + 1691 0; 1692 } 1693 1694 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1695 { 1696 struct ip_tunnel *tunnel = netdev_priv(dev); 1697 struct ip_tunnel_parm_kern *parm = &tunnel->parms; 1698 1699 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1700 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1701 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1702 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1703 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1704 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1705 !!(parm->iph.frag_off & htons(IP_DF))) || 1706 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1707 nla_put_be16(skb, IFLA_IPTUN_FLAGS, 1708 ip_tunnel_flags_to_be16(parm->i_flags)) || 1709 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1710 goto nla_put_failure; 1711 1712 #ifdef CONFIG_IPV6_SIT_6RD 1713 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1714 &tunnel->ip6rd.prefix) || 1715 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1716 tunnel->ip6rd.relay_prefix) || 1717 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1718 tunnel->ip6rd.prefixlen) || 1719 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1720 tunnel->ip6rd.relay_prefixlen)) 1721 goto nla_put_failure; 1722 #endif 1723 1724 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1725 tunnel->encap.type) || 1726 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1727 tunnel->encap.sport) || 1728 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1729 tunnel->encap.dport) || 1730 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1731 tunnel->encap.flags)) 1732 goto nla_put_failure; 1733 1734 return 0; 1735 1736 nla_put_failure: 1737 return -EMSGSIZE; 1738 } 1739 1740 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1741 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1742 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1743 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1744 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1745 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1746 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1747 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1748 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1749 #ifdef CONFIG_IPV6_SIT_6RD 1750 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1751 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1752 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1753 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1754 #endif 1755 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1756 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1757 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1758 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1759 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1760 }; 1761 1762 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1763 { 1764 struct net *net = dev_net(dev); 1765 struct sit_net *sitn = net_generic(net, sit_net_id); 1766 1767 if (dev != sitn->fb_tunnel_dev) 1768 unregister_netdevice_queue(dev, head); 1769 } 1770 1771 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1772 .kind = "sit", 1773 .maxtype = IFLA_IPTUN_MAX, 1774 .policy = ipip6_policy, 1775 .priv_size = sizeof(struct ip_tunnel), 1776 .setup = ipip6_tunnel_setup, 1777 .validate = ipip6_validate, 1778 .newlink = ipip6_newlink, 1779 .changelink = ipip6_changelink, 1780 .get_size = ipip6_get_size, 1781 .fill_info = ipip6_fill_info, 1782 .dellink = ipip6_dellink, 1783 .get_link_net = ip_tunnel_get_link_net, 1784 }; 1785 1786 static struct xfrm_tunnel sit_handler __read_mostly = { 1787 .handler = ipip6_rcv, 1788 .err_handler = ipip6_err, 1789 .priority = 1, 1790 }; 1791 1792 static struct xfrm_tunnel ipip_handler __read_mostly = { 1793 .handler = ipip_rcv, 1794 .err_handler = ipip6_err, 1795 .priority = 2, 1796 }; 1797 1798 #if IS_ENABLED(CONFIG_MPLS) 1799 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1800 .handler = mplsip_rcv, 1801 .err_handler = ipip6_err, 1802 .priority = 2, 1803 }; 1804 #endif 1805 1806 static void __net_exit sit_destroy_tunnels(struct net *net, 1807 struct list_head *head) 1808 { 1809 struct sit_net *sitn = net_generic(net, sit_net_id); 1810 struct net_device *dev, *aux; 1811 int prio; 1812 1813 for_each_netdev_safe(net, dev, aux) 1814 if (dev->rtnl_link_ops == &sit_link_ops) 1815 unregister_netdevice_queue(dev, head); 1816 1817 for (prio = 0; prio < 4; prio++) { 1818 int h; 1819 for (h = 0; h < (prio ? IP6_SIT_HASH_SIZE : 1); h++) { 1820 struct ip_tunnel *t; 1821 1822 t = rtnl_dereference(sitn->tunnels[prio][h]); 1823 while (t) { 1824 /* If dev is in the same netns, it has already 1825 * been added to the list by the previous loop. 1826 */ 1827 if (!net_eq(dev_net(t->dev), net)) 1828 unregister_netdevice_queue(t->dev, 1829 head); 1830 t = rtnl_dereference(t->next); 1831 } 1832 } 1833 } 1834 } 1835 1836 static int __net_init sit_init_net(struct net *net) 1837 { 1838 struct sit_net *sitn = net_generic(net, sit_net_id); 1839 struct ip_tunnel *t; 1840 int err; 1841 1842 sitn->tunnels[0] = sitn->tunnels_wc; 1843 sitn->tunnels[1] = sitn->tunnels_l; 1844 sitn->tunnels[2] = sitn->tunnels_r; 1845 sitn->tunnels[3] = sitn->tunnels_r_l; 1846 1847 if (!net_has_fallback_tunnels(net)) 1848 return 0; 1849 1850 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1851 NET_NAME_UNKNOWN, 1852 ipip6_tunnel_setup); 1853 if (!sitn->fb_tunnel_dev) { 1854 err = -ENOMEM; 1855 goto err_alloc_dev; 1856 } 1857 dev_net_set(sitn->fb_tunnel_dev, net); 1858 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1859 /* FB netdevice is special: we have one, and only one per netns. 1860 * Allowing to move it to another netns is clearly unsafe. 1861 */ 1862 sitn->fb_tunnel_dev->netns_immutable = true; 1863 1864 t = netdev_priv(sitn->fb_tunnel_dev); 1865 t->net = net; 1866 1867 err = register_netdev(sitn->fb_tunnel_dev); 1868 if (err) 1869 goto err_reg_dev; 1870 1871 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1872 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1873 1874 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1875 return 0; 1876 1877 err_reg_dev: 1878 free_netdev(sitn->fb_tunnel_dev); 1879 err_alloc_dev: 1880 return err; 1881 } 1882 1883 static void __net_exit sit_exit_batch_rtnl(struct list_head *net_list, 1884 struct list_head *dev_to_kill) 1885 { 1886 struct net *net; 1887 1888 ASSERT_RTNL(); 1889 list_for_each_entry(net, net_list, exit_list) 1890 sit_destroy_tunnels(net, dev_to_kill); 1891 } 1892 1893 static struct pernet_operations sit_net_ops = { 1894 .init = sit_init_net, 1895 .exit_batch_rtnl = sit_exit_batch_rtnl, 1896 .id = &sit_net_id, 1897 .size = sizeof(struct sit_net), 1898 }; 1899 1900 static void __exit sit_cleanup(void) 1901 { 1902 rtnl_link_unregister(&sit_link_ops); 1903 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1904 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1905 #if IS_ENABLED(CONFIG_MPLS) 1906 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1907 #endif 1908 1909 unregister_pernet_device(&sit_net_ops); 1910 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1911 } 1912 1913 static int __init sit_init(void) 1914 { 1915 int err; 1916 1917 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1918 1919 err = register_pernet_device(&sit_net_ops); 1920 if (err < 0) 1921 return err; 1922 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1923 if (err < 0) { 1924 pr_info("%s: can't register ip6ip4\n", __func__); 1925 goto xfrm_tunnel_failed; 1926 } 1927 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1928 if (err < 0) { 1929 pr_info("%s: can't register ip4ip4\n", __func__); 1930 goto xfrm_tunnel4_failed; 1931 } 1932 #if IS_ENABLED(CONFIG_MPLS) 1933 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1934 if (err < 0) { 1935 pr_info("%s: can't register mplsip\n", __func__); 1936 goto xfrm_tunnel_mpls_failed; 1937 } 1938 #endif 1939 err = rtnl_link_register(&sit_link_ops); 1940 if (err < 0) 1941 goto rtnl_link_failed; 1942 1943 out: 1944 return err; 1945 1946 rtnl_link_failed: 1947 #if IS_ENABLED(CONFIG_MPLS) 1948 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1949 xfrm_tunnel_mpls_failed: 1950 #endif 1951 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1952 xfrm_tunnel4_failed: 1953 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1954 xfrm_tunnel_failed: 1955 unregister_pernet_device(&sit_net_ops); 1956 goto out; 1957 } 1958 1959 module_init(sit_init); 1960 module_exit(sit_cleanup); 1961 MODULE_DESCRIPTION("IPv6-in-IPv4 tunnel SIT driver"); 1962 MODULE_LICENSE("GPL"); 1963 MODULE_ALIAS_RTNL_LINK("sit"); 1964 MODULE_ALIAS_NETDEV("sit0"); 1965