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