1 /* 2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 * 14 * Changes: 15 * Roger Venning <r.venning@telstra.com>: 6to4 support 16 * Nate Thompson <nate@thebog.net>: 6to4 support 17 * Fred Templin <fred.l.templin@boeing.com>: isatap support 18 */ 19 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22 #include <linux/module.h> 23 #include <linux/capability.h> 24 #include <linux/errno.h> 25 #include <linux/types.h> 26 #include <linux/socket.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/in6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/icmp.h> 33 #include <linux/slab.h> 34 #include <linux/uaccess.h> 35 #include <linux/init.h> 36 #include <linux/netfilter_ipv4.h> 37 #include <linux/if_ether.h> 38 39 #include <net/sock.h> 40 #include <net/snmp.h> 41 42 #include <net/ipv6.h> 43 #include <net/protocol.h> 44 #include <net/transp_v6.h> 45 #include <net/ip6_fib.h> 46 #include <net/ip6_route.h> 47 #include <net/ndisc.h> 48 #include <net/addrconf.h> 49 #include <net/ip.h> 50 #include <net/udp.h> 51 #include <net/icmp.h> 52 #include <net/ip_tunnels.h> 53 #include <net/inet_ecn.h> 54 #include <net/xfrm.h> 55 #include <net/dsfield.h> 56 #include <net/net_namespace.h> 57 #include <net/netns/generic.h> 58 59 /* 60 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c 61 62 For comments look at net/ipv4/ip_gre.c --ANK 63 */ 64 65 #define IP6_SIT_HASH_SIZE 16 66 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) 67 68 static bool log_ecn_error = true; 69 module_param(log_ecn_error, bool, 0644); 70 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 71 72 static int ipip6_tunnel_init(struct net_device *dev); 73 static void ipip6_tunnel_setup(struct net_device *dev); 74 static void ipip6_dev_free(struct net_device *dev); 75 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 76 __be32 *v4dst); 77 static struct rtnl_link_ops sit_link_ops __read_mostly; 78 79 static unsigned int sit_net_id __read_mostly; 80 struct sit_net { 81 struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; 82 struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; 83 struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; 84 struct ip_tunnel __rcu *tunnels_wc[1]; 85 struct ip_tunnel __rcu **tunnels[4]; 86 87 struct net_device *fb_tunnel_dev; 88 }; 89 90 /* 91 * Must be invoked with rcu_read_lock 92 */ 93 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, 94 struct net_device *dev, 95 __be32 remote, __be32 local, 96 int sifindex) 97 { 98 unsigned int h0 = HASH(remote); 99 unsigned int h1 = HASH(local); 100 struct ip_tunnel *t; 101 struct sit_net *sitn = net_generic(net, sit_net_id); 102 int ifindex = dev ? dev->ifindex : 0; 103 104 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { 105 if (local == t->parms.iph.saddr && 106 remote == t->parms.iph.daddr && 107 (!dev || !t->parms.link || ifindex == t->parms.link || 108 sifindex == t->parms.link) && 109 (t->dev->flags & IFF_UP)) 110 return t; 111 } 112 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { 113 if (remote == t->parms.iph.daddr && 114 (!dev || !t->parms.link || ifindex == t->parms.link || 115 sifindex == t->parms.link) && 116 (t->dev->flags & IFF_UP)) 117 return t; 118 } 119 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { 120 if (local == t->parms.iph.saddr && 121 (!dev || !t->parms.link || ifindex == t->parms.link || 122 sifindex == t->parms.link) && 123 (t->dev->flags & IFF_UP)) 124 return t; 125 } 126 t = rcu_dereference(sitn->tunnels_wc[0]); 127 if (t && (t->dev->flags & IFF_UP)) 128 return t; 129 return NULL; 130 } 131 132 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, 133 struct ip_tunnel_parm *parms) 134 { 135 __be32 remote = parms->iph.daddr; 136 __be32 local = parms->iph.saddr; 137 unsigned int h = 0; 138 int prio = 0; 139 140 if (remote) { 141 prio |= 2; 142 h ^= HASH(remote); 143 } 144 if (local) { 145 prio |= 1; 146 h ^= HASH(local); 147 } 148 return &sitn->tunnels[prio][h]; 149 } 150 151 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, 152 struct ip_tunnel *t) 153 { 154 return __ipip6_bucket(sitn, &t->parms); 155 } 156 157 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) 158 { 159 struct ip_tunnel __rcu **tp; 160 struct ip_tunnel *iter; 161 162 for (tp = ipip6_bucket(sitn, t); 163 (iter = rtnl_dereference(*tp)) != NULL; 164 tp = &iter->next) { 165 if (t == iter) { 166 rcu_assign_pointer(*tp, t->next); 167 break; 168 } 169 } 170 } 171 172 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) 173 { 174 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); 175 176 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 177 rcu_assign_pointer(*tp, t); 178 } 179 180 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) 181 { 182 #ifdef CONFIG_IPV6_SIT_6RD 183 struct ip_tunnel *t = netdev_priv(dev); 184 185 if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) { 186 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); 187 t->ip6rd.relay_prefix = 0; 188 t->ip6rd.prefixlen = 16; 189 t->ip6rd.relay_prefixlen = 0; 190 } else { 191 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); 192 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); 193 } 194 #endif 195 } 196 197 static int ipip6_tunnel_create(struct net_device *dev) 198 { 199 struct ip_tunnel *t = netdev_priv(dev); 200 struct net *net = dev_net(dev); 201 struct sit_net *sitn = net_generic(net, sit_net_id); 202 int err; 203 204 memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); 205 memcpy(dev->broadcast, &t->parms.iph.daddr, 4); 206 207 if ((__force u16)t->parms.i_flags & SIT_ISATAP) 208 dev->priv_flags |= IFF_ISATAP; 209 210 dev->rtnl_link_ops = &sit_link_ops; 211 212 err = register_netdevice(dev); 213 if (err < 0) 214 goto out; 215 216 ipip6_tunnel_clone_6rd(dev, sitn); 217 218 dev_hold(dev); 219 220 ipip6_tunnel_link(sitn, t); 221 return 0; 222 223 out: 224 return err; 225 } 226 227 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, 228 struct ip_tunnel_parm *parms, int create) 229 { 230 __be32 remote = parms->iph.daddr; 231 __be32 local = parms->iph.saddr; 232 struct ip_tunnel *t, *nt; 233 struct ip_tunnel __rcu **tp; 234 struct net_device *dev; 235 char name[IFNAMSIZ]; 236 struct sit_net *sitn = net_generic(net, sit_net_id); 237 238 for (tp = __ipip6_bucket(sitn, parms); 239 (t = rtnl_dereference(*tp)) != NULL; 240 tp = &t->next) { 241 if (local == t->parms.iph.saddr && 242 remote == t->parms.iph.daddr && 243 parms->link == t->parms.link) { 244 if (create) 245 return NULL; 246 else 247 return t; 248 } 249 } 250 if (!create) 251 goto failed; 252 253 if (parms->name[0]) { 254 if (!dev_valid_name(parms->name)) 255 goto failed; 256 strlcpy(name, parms->name, IFNAMSIZ); 257 } else { 258 strcpy(name, "sit%d"); 259 } 260 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 261 ipip6_tunnel_setup); 262 if (!dev) 263 return NULL; 264 265 dev_net_set(dev, net); 266 267 nt = netdev_priv(dev); 268 269 nt->parms = *parms; 270 if (ipip6_tunnel_create(dev) < 0) 271 goto failed_free; 272 273 return nt; 274 275 failed_free: 276 free_netdev(dev); 277 failed: 278 return NULL; 279 } 280 281 #define for_each_prl_rcu(start) \ 282 for (prl = rcu_dereference(start); \ 283 prl; \ 284 prl = rcu_dereference(prl->next)) 285 286 static struct ip_tunnel_prl_entry * 287 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 288 { 289 struct ip_tunnel_prl_entry *prl; 290 291 for_each_prl_rcu(t->prl) 292 if (prl->addr == addr) 293 break; 294 return prl; 295 296 } 297 298 static int ipip6_tunnel_get_prl(struct ip_tunnel *t, 299 struct ip_tunnel_prl __user *a) 300 { 301 struct ip_tunnel_prl kprl, *kp; 302 struct ip_tunnel_prl_entry *prl; 303 unsigned int cmax, c = 0, ca, len; 304 int ret = 0; 305 306 if (copy_from_user(&kprl, a, sizeof(kprl))) 307 return -EFAULT; 308 cmax = kprl.datalen / sizeof(kprl); 309 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 310 cmax = 1; 311 312 /* For simple GET or for root users, 313 * we try harder to allocate. 314 */ 315 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 316 kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) : 317 NULL; 318 319 rcu_read_lock(); 320 321 ca = t->prl_count < cmax ? t->prl_count : cmax; 322 323 if (!kp) { 324 /* We don't try hard to allocate much memory for 325 * non-root users. 326 * For root users, retry allocating enough memory for 327 * the answer. 328 */ 329 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); 330 if (!kp) { 331 ret = -ENOMEM; 332 goto out; 333 } 334 } 335 336 c = 0; 337 for_each_prl_rcu(t->prl) { 338 if (c >= cmax) 339 break; 340 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 341 continue; 342 kp[c].addr = prl->addr; 343 kp[c].flags = prl->flags; 344 c++; 345 if (kprl.addr != htonl(INADDR_ANY)) 346 break; 347 } 348 out: 349 rcu_read_unlock(); 350 351 len = sizeof(*kp) * c; 352 ret = 0; 353 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 354 ret = -EFAULT; 355 356 kfree(kp); 357 358 return ret; 359 } 360 361 static int 362 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 363 { 364 struct ip_tunnel_prl_entry *p; 365 int err = 0; 366 367 if (a->addr == htonl(INADDR_ANY)) 368 return -EINVAL; 369 370 ASSERT_RTNL(); 371 372 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 373 if (p->addr == a->addr) { 374 if (chg) { 375 p->flags = a->flags; 376 goto out; 377 } 378 err = -EEXIST; 379 goto out; 380 } 381 } 382 383 if (chg) { 384 err = -ENXIO; 385 goto out; 386 } 387 388 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 389 if (!p) { 390 err = -ENOBUFS; 391 goto out; 392 } 393 394 p->next = t->prl; 395 p->addr = a->addr; 396 p->flags = a->flags; 397 t->prl_count++; 398 rcu_assign_pointer(t->prl, p); 399 out: 400 return err; 401 } 402 403 static void prl_list_destroy_rcu(struct rcu_head *head) 404 { 405 struct ip_tunnel_prl_entry *p, *n; 406 407 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 408 do { 409 n = rcu_dereference_protected(p->next, 1); 410 kfree(p); 411 p = n; 412 } while (p); 413 } 414 415 static int 416 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 417 { 418 struct ip_tunnel_prl_entry *x; 419 struct ip_tunnel_prl_entry __rcu **p; 420 int err = 0; 421 422 ASSERT_RTNL(); 423 424 if (a && a->addr != htonl(INADDR_ANY)) { 425 for (p = &t->prl; 426 (x = rtnl_dereference(*p)) != NULL; 427 p = &x->next) { 428 if (x->addr == a->addr) { 429 *p = x->next; 430 kfree_rcu(x, rcu_head); 431 t->prl_count--; 432 goto out; 433 } 434 } 435 err = -ENXIO; 436 } else { 437 x = rtnl_dereference(t->prl); 438 if (x) { 439 t->prl_count = 0; 440 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 441 t->prl = NULL; 442 } 443 } 444 out: 445 return err; 446 } 447 448 static int 449 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 450 { 451 struct ip_tunnel_prl_entry *p; 452 int ok = 1; 453 454 rcu_read_lock(); 455 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 456 if (p) { 457 if (p->flags & PRL_DEFAULT) 458 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 459 else 460 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 461 } else { 462 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 463 464 if (ipv6_addr_is_isatap(addr6) && 465 (addr6->s6_addr32[3] == iph->saddr) && 466 ipv6_chk_prefix(addr6, t->dev)) 467 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 468 else 469 ok = 0; 470 } 471 rcu_read_unlock(); 472 return ok; 473 } 474 475 static void ipip6_tunnel_uninit(struct net_device *dev) 476 { 477 struct ip_tunnel *tunnel = netdev_priv(dev); 478 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); 479 480 if (dev == sitn->fb_tunnel_dev) { 481 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 482 } else { 483 ipip6_tunnel_unlink(sitn, tunnel); 484 ipip6_tunnel_del_prl(tunnel, NULL); 485 } 486 dst_cache_reset(&tunnel->dst_cache); 487 dev_put(dev); 488 } 489 490 static int ipip6_err(struct sk_buff *skb, u32 info) 491 { 492 const struct iphdr *iph = (const struct iphdr *)skb->data; 493 const int type = icmp_hdr(skb)->type; 494 const int code = icmp_hdr(skb)->code; 495 unsigned int data_len = 0; 496 struct ip_tunnel *t; 497 int sifindex; 498 int err; 499 500 switch (type) { 501 default: 502 case ICMP_PARAMETERPROB: 503 return 0; 504 505 case ICMP_DEST_UNREACH: 506 switch (code) { 507 case ICMP_SR_FAILED: 508 /* Impossible event. */ 509 return 0; 510 default: 511 /* All others are translated to HOST_UNREACH. 512 rfc2003 contains "deep thoughts" about NET_UNREACH, 513 I believe they are just ether pollution. --ANK 514 */ 515 break; 516 } 517 break; 518 case ICMP_TIME_EXCEEDED: 519 if (code != ICMP_EXC_TTL) 520 return 0; 521 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ 522 break; 523 case ICMP_REDIRECT: 524 break; 525 } 526 527 err = -ENOENT; 528 529 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 530 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 531 iph->daddr, iph->saddr, sifindex); 532 if (!t) 533 goto out; 534 535 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 536 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 537 t->parms.link, 0, iph->protocol, 0); 538 err = 0; 539 goto out; 540 } 541 if (type == ICMP_REDIRECT) { 542 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0, 543 iph->protocol, 0); 544 err = 0; 545 goto out; 546 } 547 548 err = 0; 549 if (!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 550 goto out; 551 552 if (t->parms.iph.daddr == 0) 553 goto out; 554 555 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 556 goto out; 557 558 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 559 t->err_count++; 560 else 561 t->err_count = 1; 562 t->err_time = jiffies; 563 out: 564 return err; 565 } 566 567 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 568 const struct in6_addr *v6addr) 569 { 570 __be32 v4embed = 0; 571 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 572 return true; 573 return false; 574 } 575 576 /* Checks if an address matches an address on the tunnel interface. 577 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 578 * Long story: 579 * This function is called after we considered the packet as spoofed 580 * in is_spoofed_6rd. 581 * We may have a router that is doing NAT for proto 41 packets 582 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 583 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 584 * function will return true, dropping the packet. 585 * But, we can still check if is spoofed against the IP 586 * addresses associated with the interface. 587 */ 588 static bool only_dnatted(const struct ip_tunnel *tunnel, 589 const struct in6_addr *v6dst) 590 { 591 int prefix_len; 592 593 #ifdef CONFIG_IPV6_SIT_6RD 594 prefix_len = tunnel->ip6rd.prefixlen + 32 595 - tunnel->ip6rd.relay_prefixlen; 596 #else 597 prefix_len = 48; 598 #endif 599 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 600 } 601 602 /* Returns true if a packet is spoofed */ 603 static bool packet_is_spoofed(struct sk_buff *skb, 604 const struct iphdr *iph, 605 struct ip_tunnel *tunnel) 606 { 607 const struct ipv6hdr *ipv6h; 608 609 if (tunnel->dev->priv_flags & IFF_ISATAP) { 610 if (!isatap_chksrc(skb, iph, tunnel)) 611 return true; 612 613 return false; 614 } 615 616 if (tunnel->dev->flags & IFF_POINTOPOINT) 617 return false; 618 619 ipv6h = ipv6_hdr(skb); 620 621 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 622 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 623 &iph->saddr, &ipv6h->saddr, 624 &iph->daddr, &ipv6h->daddr); 625 return true; 626 } 627 628 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 629 return false; 630 631 if (only_dnatted(tunnel, &ipv6h->daddr)) 632 return false; 633 634 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 635 &iph->saddr, &ipv6h->saddr, 636 &iph->daddr, &ipv6h->daddr); 637 return true; 638 } 639 640 static int ipip6_rcv(struct sk_buff *skb) 641 { 642 const struct iphdr *iph = ip_hdr(skb); 643 struct ip_tunnel *tunnel; 644 int sifindex; 645 int err; 646 647 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 648 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 649 iph->saddr, iph->daddr, sifindex); 650 if (tunnel) { 651 struct pcpu_sw_netstats *tstats; 652 653 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 654 tunnel->parms.iph.protocol != 0) 655 goto out; 656 657 skb->mac_header = skb->network_header; 658 skb_reset_network_header(skb); 659 IPCB(skb)->flags = 0; 660 skb->dev = tunnel->dev; 661 662 if (packet_is_spoofed(skb, iph, tunnel)) { 663 tunnel->dev->stats.rx_errors++; 664 goto out; 665 } 666 667 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 668 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 669 goto out; 670 671 err = IP_ECN_decapsulate(iph, skb); 672 if (unlikely(err)) { 673 if (log_ecn_error) 674 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 675 &iph->saddr, iph->tos); 676 if (err > 1) { 677 ++tunnel->dev->stats.rx_frame_errors; 678 ++tunnel->dev->stats.rx_errors; 679 goto out; 680 } 681 } 682 683 tstats = this_cpu_ptr(tunnel->dev->tstats); 684 u64_stats_update_begin(&tstats->syncp); 685 tstats->rx_packets++; 686 tstats->rx_bytes += skb->len; 687 u64_stats_update_end(&tstats->syncp); 688 689 netif_rx(skb); 690 691 return 0; 692 } 693 694 /* no tunnel matched, let upstream know, ipsec may handle it */ 695 return 1; 696 out: 697 kfree_skb(skb); 698 return 0; 699 } 700 701 static const struct tnl_ptk_info ipip_tpi = { 702 /* no tunnel info required for ipip. */ 703 .proto = htons(ETH_P_IP), 704 }; 705 706 #if IS_ENABLED(CONFIG_MPLS) 707 static const struct tnl_ptk_info mplsip_tpi = { 708 /* no tunnel info required for mplsip. */ 709 .proto = htons(ETH_P_MPLS_UC), 710 }; 711 #endif 712 713 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 714 { 715 const struct iphdr *iph; 716 struct ip_tunnel *tunnel; 717 int sifindex; 718 719 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 720 721 iph = ip_hdr(skb); 722 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 723 iph->saddr, iph->daddr, sifindex); 724 if (tunnel) { 725 const struct tnl_ptk_info *tpi; 726 727 if (tunnel->parms.iph.protocol != ipproto && 728 tunnel->parms.iph.protocol != 0) 729 goto drop; 730 731 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 732 goto drop; 733 #if IS_ENABLED(CONFIG_MPLS) 734 if (ipproto == IPPROTO_MPLS) 735 tpi = &mplsip_tpi; 736 else 737 #endif 738 tpi = &ipip_tpi; 739 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 740 goto drop; 741 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 742 } 743 744 return 1; 745 746 drop: 747 kfree_skb(skb); 748 return 0; 749 } 750 751 static int ipip_rcv(struct sk_buff *skb) 752 { 753 return sit_tunnel_rcv(skb, IPPROTO_IPIP); 754 } 755 756 #if IS_ENABLED(CONFIG_MPLS) 757 static int mplsip_rcv(struct sk_buff *skb) 758 { 759 return sit_tunnel_rcv(skb, IPPROTO_MPLS); 760 } 761 #endif 762 763 /* 764 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 765 * stores the embedded IPv4 address in v4dst and returns true. 766 */ 767 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 768 __be32 *v4dst) 769 { 770 #ifdef CONFIG_IPV6_SIT_6RD 771 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 772 tunnel->ip6rd.prefixlen)) { 773 unsigned int pbw0, pbi0; 774 int pbi1; 775 u32 d; 776 777 pbw0 = tunnel->ip6rd.prefixlen >> 5; 778 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 779 780 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 781 tunnel->ip6rd.relay_prefixlen; 782 783 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 784 if (pbi1 > 0) 785 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 786 (32 - pbi1); 787 788 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 789 return true; 790 } 791 #else 792 if (v6dst->s6_addr16[0] == htons(0x2002)) { 793 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 794 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 795 return true; 796 } 797 #endif 798 return false; 799 } 800 801 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 802 const struct in6_addr *v6dst) 803 { 804 __be32 dst = 0; 805 check_6rd(tunnel, v6dst, &dst); 806 return dst; 807 } 808 809 /* 810 * This function assumes it is being called from dev_queue_xmit() 811 * and that skb is filled properly by that function. 812 */ 813 814 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 815 struct net_device *dev) 816 { 817 struct ip_tunnel *tunnel = netdev_priv(dev); 818 const struct iphdr *tiph = &tunnel->parms.iph; 819 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 820 u8 tos = tunnel->parms.iph.tos; 821 __be16 df = tiph->frag_off; 822 struct rtable *rt; /* Route to the other host */ 823 struct net_device *tdev; /* Device to other host */ 824 unsigned int max_headroom; /* The extra header space needed */ 825 __be32 dst = tiph->daddr; 826 struct flowi4 fl4; 827 int mtu; 828 const struct in6_addr *addr6; 829 int addr_type; 830 u8 ttl; 831 u8 protocol = IPPROTO_IPV6; 832 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 833 834 if (tos == 1) 835 tos = ipv6_get_dsfield(iph6); 836 837 /* ISATAP (RFC4214) - must come before 6to4 */ 838 if (dev->priv_flags & IFF_ISATAP) { 839 struct neighbour *neigh = NULL; 840 bool do_tx_error = false; 841 842 if (skb_dst(skb)) 843 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 844 845 if (!neigh) { 846 net_dbg_ratelimited("nexthop == NULL\n"); 847 goto tx_error; 848 } 849 850 addr6 = (const struct in6_addr *)&neigh->primary_key; 851 addr_type = ipv6_addr_type(addr6); 852 853 if ((addr_type & IPV6_ADDR_UNICAST) && 854 ipv6_addr_is_isatap(addr6)) 855 dst = addr6->s6_addr32[3]; 856 else 857 do_tx_error = true; 858 859 neigh_release(neigh); 860 if (do_tx_error) 861 goto tx_error; 862 } 863 864 if (!dst) 865 dst = try_6rd(tunnel, &iph6->daddr); 866 867 if (!dst) { 868 struct neighbour *neigh = NULL; 869 bool do_tx_error = false; 870 871 if (skb_dst(skb)) 872 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 873 874 if (!neigh) { 875 net_dbg_ratelimited("nexthop == NULL\n"); 876 goto tx_error; 877 } 878 879 addr6 = (const struct in6_addr *)&neigh->primary_key; 880 addr_type = ipv6_addr_type(addr6); 881 882 if (addr_type == IPV6_ADDR_ANY) { 883 addr6 = &ipv6_hdr(skb)->daddr; 884 addr_type = ipv6_addr_type(addr6); 885 } 886 887 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 888 dst = addr6->s6_addr32[3]; 889 else 890 do_tx_error = true; 891 892 neigh_release(neigh); 893 if (do_tx_error) 894 goto tx_error; 895 } 896 897 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 898 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, 899 0, dst, tiph->saddr, 0, 0, 900 sock_net_uid(tunnel->net, NULL)); 901 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 902 903 if (IS_ERR(rt)) { 904 dev->stats.tx_carrier_errors++; 905 goto tx_error_icmp; 906 } 907 if (rt->rt_type != RTN_UNICAST) { 908 ip_rt_put(rt); 909 dev->stats.tx_carrier_errors++; 910 goto tx_error_icmp; 911 } 912 tdev = rt->dst.dev; 913 914 if (tdev == dev) { 915 ip_rt_put(rt); 916 dev->stats.collisions++; 917 goto tx_error; 918 } 919 920 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 921 ip_rt_put(rt); 922 goto tx_error; 923 } 924 925 if (df) { 926 mtu = dst_mtu(&rt->dst) - t_hlen; 927 928 if (mtu < 68) { 929 dev->stats.collisions++; 930 ip_rt_put(rt); 931 goto tx_error; 932 } 933 934 if (mtu < IPV6_MIN_MTU) { 935 mtu = IPV6_MIN_MTU; 936 df = 0; 937 } 938 939 if (tunnel->parms.iph.daddr) 940 skb_dst_update_pmtu(skb, mtu); 941 942 if (skb->len > mtu && !skb_is_gso(skb)) { 943 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 944 ip_rt_put(rt); 945 goto tx_error; 946 } 947 } 948 949 if (tunnel->err_count > 0) { 950 if (time_before(jiffies, 951 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 952 tunnel->err_count--; 953 dst_link_failure(skb); 954 } else 955 tunnel->err_count = 0; 956 } 957 958 /* 959 * Okay, now see if we can stuff it in the buffer as-is. 960 */ 961 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 962 963 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 964 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 965 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 966 if (!new_skb) { 967 ip_rt_put(rt); 968 dev->stats.tx_dropped++; 969 kfree_skb(skb); 970 return NETDEV_TX_OK; 971 } 972 if (skb->sk) 973 skb_set_owner_w(new_skb, skb->sk); 974 dev_kfree_skb(skb); 975 skb = new_skb; 976 iph6 = ipv6_hdr(skb); 977 } 978 ttl = tiph->ttl; 979 if (ttl == 0) 980 ttl = iph6->hop_limit; 981 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 982 983 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { 984 ip_rt_put(rt); 985 goto tx_error; 986 } 987 988 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 989 990 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 991 df, !net_eq(tunnel->net, dev_net(dev))); 992 return NETDEV_TX_OK; 993 994 tx_error_icmp: 995 dst_link_failure(skb); 996 tx_error: 997 kfree_skb(skb); 998 dev->stats.tx_errors++; 999 return NETDEV_TX_OK; 1000 } 1001 1002 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1003 struct net_device *dev, u8 ipproto) 1004 { 1005 struct ip_tunnel *tunnel = netdev_priv(dev); 1006 const struct iphdr *tiph = &tunnel->parms.iph; 1007 1008 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1009 goto tx_error; 1010 1011 skb_set_inner_ipproto(skb, ipproto); 1012 1013 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1014 return NETDEV_TX_OK; 1015 tx_error: 1016 kfree_skb(skb); 1017 dev->stats.tx_errors++; 1018 return NETDEV_TX_OK; 1019 } 1020 1021 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1022 struct net_device *dev) 1023 { 1024 switch (skb->protocol) { 1025 case htons(ETH_P_IP): 1026 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1027 break; 1028 case htons(ETH_P_IPV6): 1029 ipip6_tunnel_xmit(skb, dev); 1030 break; 1031 #if IS_ENABLED(CONFIG_MPLS) 1032 case htons(ETH_P_MPLS_UC): 1033 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1034 break; 1035 #endif 1036 default: 1037 goto tx_err; 1038 } 1039 1040 return NETDEV_TX_OK; 1041 1042 tx_err: 1043 dev->stats.tx_errors++; 1044 kfree_skb(skb); 1045 return NETDEV_TX_OK; 1046 1047 } 1048 1049 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1050 { 1051 struct net_device *tdev = NULL; 1052 struct ip_tunnel *tunnel; 1053 const struct iphdr *iph; 1054 struct flowi4 fl4; 1055 1056 tunnel = netdev_priv(dev); 1057 iph = &tunnel->parms.iph; 1058 1059 if (iph->daddr) { 1060 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1061 NULL, 1062 iph->daddr, iph->saddr, 1063 0, 0, 1064 IPPROTO_IPV6, 1065 RT_TOS(iph->tos), 1066 tunnel->parms.link); 1067 1068 if (!IS_ERR(rt)) { 1069 tdev = rt->dst.dev; 1070 ip_rt_put(rt); 1071 } 1072 dev->flags |= IFF_POINTOPOINT; 1073 } 1074 1075 if (!tdev && tunnel->parms.link) 1076 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1077 1078 if (tdev) { 1079 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1080 1081 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); 1082 dev->mtu = tdev->mtu - t_hlen; 1083 if (dev->mtu < IPV6_MIN_MTU) 1084 dev->mtu = IPV6_MIN_MTU; 1085 } 1086 } 1087 1088 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, 1089 __u32 fwmark) 1090 { 1091 struct net *net = t->net; 1092 struct sit_net *sitn = net_generic(net, sit_net_id); 1093 1094 ipip6_tunnel_unlink(sitn, t); 1095 synchronize_net(); 1096 t->parms.iph.saddr = p->iph.saddr; 1097 t->parms.iph.daddr = p->iph.daddr; 1098 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 1099 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1100 ipip6_tunnel_link(sitn, t); 1101 t->parms.iph.ttl = p->iph.ttl; 1102 t->parms.iph.tos = p->iph.tos; 1103 t->parms.iph.frag_off = p->iph.frag_off; 1104 if (t->parms.link != p->link || t->fwmark != fwmark) { 1105 t->parms.link = p->link; 1106 t->fwmark = fwmark; 1107 ipip6_tunnel_bind_dev(t->dev); 1108 } 1109 dst_cache_reset(&t->dst_cache); 1110 netdev_state_change(t->dev); 1111 } 1112 1113 #ifdef CONFIG_IPV6_SIT_6RD 1114 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1115 struct ip_tunnel_6rd *ip6rd) 1116 { 1117 struct in6_addr prefix; 1118 __be32 relay_prefix; 1119 1120 if (ip6rd->relay_prefixlen > 32 || 1121 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1122 return -EINVAL; 1123 1124 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1125 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1126 return -EINVAL; 1127 if (ip6rd->relay_prefixlen) 1128 relay_prefix = ip6rd->relay_prefix & 1129 htonl(0xffffffffUL << 1130 (32 - ip6rd->relay_prefixlen)); 1131 else 1132 relay_prefix = 0; 1133 if (relay_prefix != ip6rd->relay_prefix) 1134 return -EINVAL; 1135 1136 t->ip6rd.prefix = prefix; 1137 t->ip6rd.relay_prefix = relay_prefix; 1138 t->ip6rd.prefixlen = ip6rd->prefixlen; 1139 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1140 dst_cache_reset(&t->dst_cache); 1141 netdev_state_change(t->dev); 1142 return 0; 1143 } 1144 #endif 1145 1146 static bool ipip6_valid_ip_proto(u8 ipproto) 1147 { 1148 return ipproto == IPPROTO_IPV6 || 1149 ipproto == IPPROTO_IPIP || 1150 #if IS_ENABLED(CONFIG_MPLS) 1151 ipproto == IPPROTO_MPLS || 1152 #endif 1153 ipproto == 0; 1154 } 1155 1156 static int 1157 ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1158 { 1159 int err = 0; 1160 struct ip_tunnel_parm p; 1161 struct ip_tunnel_prl prl; 1162 struct ip_tunnel *t = netdev_priv(dev); 1163 struct net *net = t->net; 1164 struct sit_net *sitn = net_generic(net, sit_net_id); 1165 #ifdef CONFIG_IPV6_SIT_6RD 1166 struct ip_tunnel_6rd ip6rd; 1167 #endif 1168 1169 switch (cmd) { 1170 case SIOCGETTUNNEL: 1171 #ifdef CONFIG_IPV6_SIT_6RD 1172 case SIOCGET6RD: 1173 #endif 1174 if (dev == sitn->fb_tunnel_dev) { 1175 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1176 err = -EFAULT; 1177 break; 1178 } 1179 t = ipip6_tunnel_locate(net, &p, 0); 1180 if (!t) 1181 t = netdev_priv(dev); 1182 } 1183 1184 err = -EFAULT; 1185 if (cmd == SIOCGETTUNNEL) { 1186 memcpy(&p, &t->parms, sizeof(p)); 1187 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, 1188 sizeof(p))) 1189 goto done; 1190 #ifdef CONFIG_IPV6_SIT_6RD 1191 } else { 1192 ip6rd.prefix = t->ip6rd.prefix; 1193 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1194 ip6rd.prefixlen = t->ip6rd.prefixlen; 1195 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1196 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, 1197 sizeof(ip6rd))) 1198 goto done; 1199 #endif 1200 } 1201 err = 0; 1202 break; 1203 1204 case SIOCADDTUNNEL: 1205 case SIOCCHGTUNNEL: 1206 err = -EPERM; 1207 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1208 goto done; 1209 1210 err = -EFAULT; 1211 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1212 goto done; 1213 1214 err = -EINVAL; 1215 if (!ipip6_valid_ip_proto(p.iph.protocol)) 1216 goto done; 1217 if (p.iph.version != 4 || 1218 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) 1219 goto done; 1220 if (p.iph.ttl) 1221 p.iph.frag_off |= htons(IP_DF); 1222 1223 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); 1224 1225 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1226 if (t) { 1227 if (t->dev != dev) { 1228 err = -EEXIST; 1229 break; 1230 } 1231 } else { 1232 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || 1233 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { 1234 err = -EINVAL; 1235 break; 1236 } 1237 t = netdev_priv(dev); 1238 } 1239 1240 ipip6_tunnel_update(t, &p, t->fwmark); 1241 } 1242 1243 if (t) { 1244 err = 0; 1245 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) 1246 err = -EFAULT; 1247 } else 1248 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1249 break; 1250 1251 case SIOCDELTUNNEL: 1252 err = -EPERM; 1253 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1254 goto done; 1255 1256 if (dev == sitn->fb_tunnel_dev) { 1257 err = -EFAULT; 1258 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1259 goto done; 1260 err = -ENOENT; 1261 t = ipip6_tunnel_locate(net, &p, 0); 1262 if (!t) 1263 goto done; 1264 err = -EPERM; 1265 if (t == netdev_priv(sitn->fb_tunnel_dev)) 1266 goto done; 1267 dev = t->dev; 1268 } 1269 unregister_netdevice(dev); 1270 err = 0; 1271 break; 1272 1273 case SIOCGETPRL: 1274 err = -EINVAL; 1275 if (dev == sitn->fb_tunnel_dev) 1276 goto done; 1277 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); 1278 break; 1279 1280 case SIOCADDPRL: 1281 case SIOCDELPRL: 1282 case SIOCCHGPRL: 1283 err = -EPERM; 1284 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1285 goto done; 1286 err = -EINVAL; 1287 if (dev == sitn->fb_tunnel_dev) 1288 goto done; 1289 err = -EFAULT; 1290 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) 1291 goto done; 1292 1293 switch (cmd) { 1294 case SIOCDELPRL: 1295 err = ipip6_tunnel_del_prl(t, &prl); 1296 break; 1297 case SIOCADDPRL: 1298 case SIOCCHGPRL: 1299 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 1300 break; 1301 } 1302 dst_cache_reset(&t->dst_cache); 1303 netdev_state_change(dev); 1304 break; 1305 1306 #ifdef CONFIG_IPV6_SIT_6RD 1307 case SIOCADD6RD: 1308 case SIOCCHG6RD: 1309 case SIOCDEL6RD: 1310 err = -EPERM; 1311 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1312 goto done; 1313 1314 err = -EFAULT; 1315 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, 1316 sizeof(ip6rd))) 1317 goto done; 1318 1319 if (cmd != SIOCDEL6RD) { 1320 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1321 if (err < 0) 1322 goto done; 1323 } else 1324 ipip6_tunnel_clone_6rd(dev, sitn); 1325 1326 err = 0; 1327 break; 1328 #endif 1329 1330 default: 1331 err = -EINVAL; 1332 } 1333 1334 done: 1335 return err; 1336 } 1337 1338 static const struct net_device_ops ipip6_netdev_ops = { 1339 .ndo_init = ipip6_tunnel_init, 1340 .ndo_uninit = ipip6_tunnel_uninit, 1341 .ndo_start_xmit = sit_tunnel_xmit, 1342 .ndo_do_ioctl = ipip6_tunnel_ioctl, 1343 .ndo_get_stats64 = ip_tunnel_get_stats64, 1344 .ndo_get_iflink = ip_tunnel_get_iflink, 1345 }; 1346 1347 static void ipip6_dev_free(struct net_device *dev) 1348 { 1349 struct ip_tunnel *tunnel = netdev_priv(dev); 1350 1351 dst_cache_destroy(&tunnel->dst_cache); 1352 free_percpu(dev->tstats); 1353 } 1354 1355 #define SIT_FEATURES (NETIF_F_SG | \ 1356 NETIF_F_FRAGLIST | \ 1357 NETIF_F_HIGHDMA | \ 1358 NETIF_F_GSO_SOFTWARE | \ 1359 NETIF_F_HW_CSUM) 1360 1361 static void ipip6_tunnel_setup(struct net_device *dev) 1362 { 1363 struct ip_tunnel *tunnel = netdev_priv(dev); 1364 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1365 1366 dev->netdev_ops = &ipip6_netdev_ops; 1367 dev->needs_free_netdev = true; 1368 dev->priv_destructor = ipip6_dev_free; 1369 1370 dev->type = ARPHRD_SIT; 1371 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1372 dev->mtu = ETH_DATA_LEN - t_hlen; 1373 dev->min_mtu = IPV6_MIN_MTU; 1374 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1375 dev->flags = IFF_NOARP; 1376 netif_keep_dst(dev); 1377 dev->addr_len = 4; 1378 dev->features |= NETIF_F_LLTX; 1379 dev->features |= SIT_FEATURES; 1380 dev->hw_features |= SIT_FEATURES; 1381 } 1382 1383 static int ipip6_tunnel_init(struct net_device *dev) 1384 { 1385 struct ip_tunnel *tunnel = netdev_priv(dev); 1386 int err; 1387 1388 tunnel->dev = dev; 1389 tunnel->net = dev_net(dev); 1390 strcpy(tunnel->parms.name, dev->name); 1391 1392 ipip6_tunnel_bind_dev(dev); 1393 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1394 if (!dev->tstats) 1395 return -ENOMEM; 1396 1397 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1398 if (err) { 1399 free_percpu(dev->tstats); 1400 dev->tstats = NULL; 1401 return err; 1402 } 1403 1404 return 0; 1405 } 1406 1407 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1408 { 1409 struct ip_tunnel *tunnel = netdev_priv(dev); 1410 struct iphdr *iph = &tunnel->parms.iph; 1411 struct net *net = dev_net(dev); 1412 struct sit_net *sitn = net_generic(net, sit_net_id); 1413 1414 iph->version = 4; 1415 iph->protocol = IPPROTO_IPV6; 1416 iph->ihl = 5; 1417 iph->ttl = 64; 1418 1419 dev_hold(dev); 1420 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1421 } 1422 1423 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1424 struct netlink_ext_ack *extack) 1425 { 1426 u8 proto; 1427 1428 if (!data || !data[IFLA_IPTUN_PROTO]) 1429 return 0; 1430 1431 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1432 if (!ipip6_valid_ip_proto(proto)) 1433 return -EINVAL; 1434 1435 return 0; 1436 } 1437 1438 static void ipip6_netlink_parms(struct nlattr *data[], 1439 struct ip_tunnel_parm *parms, 1440 __u32 *fwmark) 1441 { 1442 memset(parms, 0, sizeof(*parms)); 1443 1444 parms->iph.version = 4; 1445 parms->iph.protocol = IPPROTO_IPV6; 1446 parms->iph.ihl = 5; 1447 parms->iph.ttl = 64; 1448 1449 if (!data) 1450 return; 1451 1452 if (data[IFLA_IPTUN_LINK]) 1453 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1454 1455 if (data[IFLA_IPTUN_LOCAL]) 1456 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1457 1458 if (data[IFLA_IPTUN_REMOTE]) 1459 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1460 1461 if (data[IFLA_IPTUN_TTL]) { 1462 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1463 if (parms->iph.ttl) 1464 parms->iph.frag_off = htons(IP_DF); 1465 } 1466 1467 if (data[IFLA_IPTUN_TOS]) 1468 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1469 1470 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1471 parms->iph.frag_off = htons(IP_DF); 1472 1473 if (data[IFLA_IPTUN_FLAGS]) 1474 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1475 1476 if (data[IFLA_IPTUN_PROTO]) 1477 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1478 1479 if (data[IFLA_IPTUN_FWMARK]) 1480 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1481 } 1482 1483 /* This function returns true when ENCAP attributes are present in the nl msg */ 1484 static bool ipip6_netlink_encap_parms(struct nlattr *data[], 1485 struct ip_tunnel_encap *ipencap) 1486 { 1487 bool ret = false; 1488 1489 memset(ipencap, 0, sizeof(*ipencap)); 1490 1491 if (!data) 1492 return ret; 1493 1494 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1495 ret = true; 1496 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1497 } 1498 1499 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1500 ret = true; 1501 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1502 } 1503 1504 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1505 ret = true; 1506 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1507 } 1508 1509 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1510 ret = true; 1511 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1512 } 1513 1514 return ret; 1515 } 1516 1517 #ifdef CONFIG_IPV6_SIT_6RD 1518 /* This function returns true when 6RD attributes are present in the nl msg */ 1519 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1520 struct ip_tunnel_6rd *ip6rd) 1521 { 1522 bool ret = false; 1523 memset(ip6rd, 0, sizeof(*ip6rd)); 1524 1525 if (!data) 1526 return ret; 1527 1528 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1529 ret = true; 1530 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1531 } 1532 1533 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1534 ret = true; 1535 ip6rd->relay_prefix = 1536 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1537 } 1538 1539 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1540 ret = true; 1541 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1542 } 1543 1544 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1545 ret = true; 1546 ip6rd->relay_prefixlen = 1547 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1548 } 1549 1550 return ret; 1551 } 1552 #endif 1553 1554 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1555 struct nlattr *tb[], struct nlattr *data[], 1556 struct netlink_ext_ack *extack) 1557 { 1558 struct net *net = dev_net(dev); 1559 struct ip_tunnel *nt; 1560 struct ip_tunnel_encap ipencap; 1561 #ifdef CONFIG_IPV6_SIT_6RD 1562 struct ip_tunnel_6rd ip6rd; 1563 #endif 1564 int err; 1565 1566 nt = netdev_priv(dev); 1567 1568 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1569 err = ip_tunnel_encap_setup(nt, &ipencap); 1570 if (err < 0) 1571 return err; 1572 } 1573 1574 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1575 1576 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1577 return -EEXIST; 1578 1579 err = ipip6_tunnel_create(dev); 1580 if (err < 0) 1581 return err; 1582 1583 if (tb[IFLA_MTU]) { 1584 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1585 1586 if (mtu >= IPV6_MIN_MTU && 1587 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1588 dev->mtu = mtu; 1589 } 1590 1591 #ifdef CONFIG_IPV6_SIT_6RD 1592 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1593 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1594 #endif 1595 1596 return err; 1597 } 1598 1599 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1600 struct nlattr *data[], 1601 struct netlink_ext_ack *extack) 1602 { 1603 struct ip_tunnel *t = netdev_priv(dev); 1604 struct ip_tunnel_parm p; 1605 struct ip_tunnel_encap ipencap; 1606 struct net *net = t->net; 1607 struct sit_net *sitn = net_generic(net, sit_net_id); 1608 #ifdef CONFIG_IPV6_SIT_6RD 1609 struct ip_tunnel_6rd ip6rd; 1610 #endif 1611 __u32 fwmark = t->fwmark; 1612 int err; 1613 1614 if (dev == sitn->fb_tunnel_dev) 1615 return -EINVAL; 1616 1617 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1618 err = ip_tunnel_encap_setup(t, &ipencap); 1619 if (err < 0) 1620 return err; 1621 } 1622 1623 ipip6_netlink_parms(data, &p, &fwmark); 1624 1625 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1626 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1627 return -EINVAL; 1628 1629 t = ipip6_tunnel_locate(net, &p, 0); 1630 1631 if (t) { 1632 if (t->dev != dev) 1633 return -EEXIST; 1634 } else 1635 t = netdev_priv(dev); 1636 1637 ipip6_tunnel_update(t, &p, fwmark); 1638 1639 #ifdef CONFIG_IPV6_SIT_6RD 1640 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1641 return ipip6_tunnel_update_6rd(t, &ip6rd); 1642 #endif 1643 1644 return 0; 1645 } 1646 1647 static size_t ipip6_get_size(const struct net_device *dev) 1648 { 1649 return 1650 /* IFLA_IPTUN_LINK */ 1651 nla_total_size(4) + 1652 /* IFLA_IPTUN_LOCAL */ 1653 nla_total_size(4) + 1654 /* IFLA_IPTUN_REMOTE */ 1655 nla_total_size(4) + 1656 /* IFLA_IPTUN_TTL */ 1657 nla_total_size(1) + 1658 /* IFLA_IPTUN_TOS */ 1659 nla_total_size(1) + 1660 /* IFLA_IPTUN_PMTUDISC */ 1661 nla_total_size(1) + 1662 /* IFLA_IPTUN_FLAGS */ 1663 nla_total_size(2) + 1664 /* IFLA_IPTUN_PROTO */ 1665 nla_total_size(1) + 1666 #ifdef CONFIG_IPV6_SIT_6RD 1667 /* IFLA_IPTUN_6RD_PREFIX */ 1668 nla_total_size(sizeof(struct in6_addr)) + 1669 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1670 nla_total_size(4) + 1671 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1672 nla_total_size(2) + 1673 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1674 nla_total_size(2) + 1675 #endif 1676 /* IFLA_IPTUN_ENCAP_TYPE */ 1677 nla_total_size(2) + 1678 /* IFLA_IPTUN_ENCAP_FLAGS */ 1679 nla_total_size(2) + 1680 /* IFLA_IPTUN_ENCAP_SPORT */ 1681 nla_total_size(2) + 1682 /* IFLA_IPTUN_ENCAP_DPORT */ 1683 nla_total_size(2) + 1684 /* IFLA_IPTUN_FWMARK */ 1685 nla_total_size(4) + 1686 0; 1687 } 1688 1689 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1690 { 1691 struct ip_tunnel *tunnel = netdev_priv(dev); 1692 struct ip_tunnel_parm *parm = &tunnel->parms; 1693 1694 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1695 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1696 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1697 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1698 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1699 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1700 !!(parm->iph.frag_off & htons(IP_DF))) || 1701 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1702 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || 1703 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1704 goto nla_put_failure; 1705 1706 #ifdef CONFIG_IPV6_SIT_6RD 1707 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1708 &tunnel->ip6rd.prefix) || 1709 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1710 tunnel->ip6rd.relay_prefix) || 1711 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1712 tunnel->ip6rd.prefixlen) || 1713 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1714 tunnel->ip6rd.relay_prefixlen)) 1715 goto nla_put_failure; 1716 #endif 1717 1718 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1719 tunnel->encap.type) || 1720 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1721 tunnel->encap.sport) || 1722 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1723 tunnel->encap.dport) || 1724 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1725 tunnel->encap.flags)) 1726 goto nla_put_failure; 1727 1728 return 0; 1729 1730 nla_put_failure: 1731 return -EMSGSIZE; 1732 } 1733 1734 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1735 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1736 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1737 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1738 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1739 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1740 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1741 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1742 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1743 #ifdef CONFIG_IPV6_SIT_6RD 1744 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1745 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1746 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1747 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1748 #endif 1749 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1750 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1751 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1752 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1753 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1754 }; 1755 1756 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1757 { 1758 struct net *net = dev_net(dev); 1759 struct sit_net *sitn = net_generic(net, sit_net_id); 1760 1761 if (dev != sitn->fb_tunnel_dev) 1762 unregister_netdevice_queue(dev, head); 1763 } 1764 1765 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1766 .kind = "sit", 1767 .maxtype = IFLA_IPTUN_MAX, 1768 .policy = ipip6_policy, 1769 .priv_size = sizeof(struct ip_tunnel), 1770 .setup = ipip6_tunnel_setup, 1771 .validate = ipip6_validate, 1772 .newlink = ipip6_newlink, 1773 .changelink = ipip6_changelink, 1774 .get_size = ipip6_get_size, 1775 .fill_info = ipip6_fill_info, 1776 .dellink = ipip6_dellink, 1777 .get_link_net = ip_tunnel_get_link_net, 1778 }; 1779 1780 static struct xfrm_tunnel sit_handler __read_mostly = { 1781 .handler = ipip6_rcv, 1782 .err_handler = ipip6_err, 1783 .priority = 1, 1784 }; 1785 1786 static struct xfrm_tunnel ipip_handler __read_mostly = { 1787 .handler = ipip_rcv, 1788 .err_handler = ipip6_err, 1789 .priority = 2, 1790 }; 1791 1792 #if IS_ENABLED(CONFIG_MPLS) 1793 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1794 .handler = mplsip_rcv, 1795 .err_handler = ipip6_err, 1796 .priority = 2, 1797 }; 1798 #endif 1799 1800 static void __net_exit sit_destroy_tunnels(struct net *net, 1801 struct list_head *head) 1802 { 1803 struct sit_net *sitn = net_generic(net, sit_net_id); 1804 struct net_device *dev, *aux; 1805 int prio; 1806 1807 for_each_netdev_safe(net, dev, aux) 1808 if (dev->rtnl_link_ops == &sit_link_ops) 1809 unregister_netdevice_queue(dev, head); 1810 1811 for (prio = 1; prio < 4; prio++) { 1812 int h; 1813 for (h = 0; h < IP6_SIT_HASH_SIZE; h++) { 1814 struct ip_tunnel *t; 1815 1816 t = rtnl_dereference(sitn->tunnels[prio][h]); 1817 while (t) { 1818 /* If dev is in the same netns, it has already 1819 * been added to the list by the previous loop. 1820 */ 1821 if (!net_eq(dev_net(t->dev), net)) 1822 unregister_netdevice_queue(t->dev, 1823 head); 1824 t = rtnl_dereference(t->next); 1825 } 1826 } 1827 } 1828 } 1829 1830 static int __net_init sit_init_net(struct net *net) 1831 { 1832 struct sit_net *sitn = net_generic(net, sit_net_id); 1833 struct ip_tunnel *t; 1834 int err; 1835 1836 sitn->tunnels[0] = sitn->tunnels_wc; 1837 sitn->tunnels[1] = sitn->tunnels_l; 1838 sitn->tunnels[2] = sitn->tunnels_r; 1839 sitn->tunnels[3] = sitn->tunnels_r_l; 1840 1841 if (!net_has_fallback_tunnels(net)) 1842 return 0; 1843 1844 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1845 NET_NAME_UNKNOWN, 1846 ipip6_tunnel_setup); 1847 if (!sitn->fb_tunnel_dev) { 1848 err = -ENOMEM; 1849 goto err_alloc_dev; 1850 } 1851 dev_net_set(sitn->fb_tunnel_dev, net); 1852 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1853 /* FB netdevice is special: we have one, and only one per netns. 1854 * Allowing to move it to another netns is clearly unsafe. 1855 */ 1856 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1857 1858 err = register_netdev(sitn->fb_tunnel_dev); 1859 if (err) 1860 goto err_reg_dev; 1861 1862 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1863 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1864 1865 t = netdev_priv(sitn->fb_tunnel_dev); 1866 1867 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1868 return 0; 1869 1870 err_reg_dev: 1871 ipip6_dev_free(sitn->fb_tunnel_dev); 1872 err_alloc_dev: 1873 return err; 1874 } 1875 1876 static void __net_exit sit_exit_batch_net(struct list_head *net_list) 1877 { 1878 LIST_HEAD(list); 1879 struct net *net; 1880 1881 rtnl_lock(); 1882 list_for_each_entry(net, net_list, exit_list) 1883 sit_destroy_tunnels(net, &list); 1884 1885 unregister_netdevice_many(&list); 1886 rtnl_unlock(); 1887 } 1888 1889 static struct pernet_operations sit_net_ops = { 1890 .init = sit_init_net, 1891 .exit_batch = sit_exit_batch_net, 1892 .id = &sit_net_id, 1893 .size = sizeof(struct sit_net), 1894 }; 1895 1896 static void __exit sit_cleanup(void) 1897 { 1898 rtnl_link_unregister(&sit_link_ops); 1899 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1900 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1901 #if IS_ENABLED(CONFIG_MPLS) 1902 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1903 #endif 1904 1905 unregister_pernet_device(&sit_net_ops); 1906 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1907 } 1908 1909 static int __init sit_init(void) 1910 { 1911 int err; 1912 1913 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1914 1915 err = register_pernet_device(&sit_net_ops); 1916 if (err < 0) 1917 return err; 1918 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1919 if (err < 0) { 1920 pr_info("%s: can't register ip6ip4\n", __func__); 1921 goto xfrm_tunnel_failed; 1922 } 1923 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1924 if (err < 0) { 1925 pr_info("%s: can't register ip4ip4\n", __func__); 1926 goto xfrm_tunnel4_failed; 1927 } 1928 #if IS_ENABLED(CONFIG_MPLS) 1929 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1930 if (err < 0) { 1931 pr_info("%s: can't register mplsip\n", __func__); 1932 goto xfrm_tunnel_mpls_failed; 1933 } 1934 #endif 1935 err = rtnl_link_register(&sit_link_ops); 1936 if (err < 0) 1937 goto rtnl_link_failed; 1938 1939 out: 1940 return err; 1941 1942 rtnl_link_failed: 1943 #if IS_ENABLED(CONFIG_MPLS) 1944 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1945 xfrm_tunnel_mpls_failed: 1946 #endif 1947 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1948 xfrm_tunnel4_failed: 1949 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1950 xfrm_tunnel_failed: 1951 unregister_pernet_device(&sit_net_ops); 1952 goto out; 1953 } 1954 1955 module_init(sit_init); 1956 module_exit(sit_cleanup); 1957 MODULE_LICENSE("GPL"); 1958 MODULE_ALIAS_RTNL_LINK("sit"); 1959 MODULE_ALIAS_NETDEV("sit0"); 1960