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, iph->protocol); 538 err = 0; 539 goto out; 540 } 541 if (type == ICMP_REDIRECT) { 542 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 543 iph->protocol); 544 err = 0; 545 goto out; 546 } 547 548 err = 0; 549 if (__in6_dev_get(skb->dev) && 550 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 551 goto out; 552 553 if (t->parms.iph.daddr == 0) 554 goto out; 555 556 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 557 goto out; 558 559 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 560 t->err_count++; 561 else 562 t->err_count = 1; 563 t->err_time = jiffies; 564 out: 565 return err; 566 } 567 568 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 569 const struct in6_addr *v6addr) 570 { 571 __be32 v4embed = 0; 572 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 573 return true; 574 return false; 575 } 576 577 /* Checks if an address matches an address on the tunnel interface. 578 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 579 * Long story: 580 * This function is called after we considered the packet as spoofed 581 * in is_spoofed_6rd. 582 * We may have a router that is doing NAT for proto 41 packets 583 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 584 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 585 * function will return true, dropping the packet. 586 * But, we can still check if is spoofed against the IP 587 * addresses associated with the interface. 588 */ 589 static bool only_dnatted(const struct ip_tunnel *tunnel, 590 const struct in6_addr *v6dst) 591 { 592 int prefix_len; 593 594 #ifdef CONFIG_IPV6_SIT_6RD 595 prefix_len = tunnel->ip6rd.prefixlen + 32 596 - tunnel->ip6rd.relay_prefixlen; 597 #else 598 prefix_len = 48; 599 #endif 600 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 601 } 602 603 /* Returns true if a packet is spoofed */ 604 static bool packet_is_spoofed(struct sk_buff *skb, 605 const struct iphdr *iph, 606 struct ip_tunnel *tunnel) 607 { 608 const struct ipv6hdr *ipv6h; 609 610 if (tunnel->dev->priv_flags & IFF_ISATAP) { 611 if (!isatap_chksrc(skb, iph, tunnel)) 612 return true; 613 614 return false; 615 } 616 617 if (tunnel->dev->flags & IFF_POINTOPOINT) 618 return false; 619 620 ipv6h = ipv6_hdr(skb); 621 622 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 623 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 624 &iph->saddr, &ipv6h->saddr, 625 &iph->daddr, &ipv6h->daddr); 626 return true; 627 } 628 629 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 630 return false; 631 632 if (only_dnatted(tunnel, &ipv6h->daddr)) 633 return false; 634 635 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 636 &iph->saddr, &ipv6h->saddr, 637 &iph->daddr, &ipv6h->daddr); 638 return true; 639 } 640 641 static int ipip6_rcv(struct sk_buff *skb) 642 { 643 const struct iphdr *iph = ip_hdr(skb); 644 struct ip_tunnel *tunnel; 645 int sifindex; 646 int err; 647 648 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 649 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 650 iph->saddr, iph->daddr, sifindex); 651 if (tunnel) { 652 struct pcpu_sw_netstats *tstats; 653 654 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 655 tunnel->parms.iph.protocol != 0) 656 goto out; 657 658 skb->mac_header = skb->network_header; 659 skb_reset_network_header(skb); 660 IPCB(skb)->flags = 0; 661 skb->dev = tunnel->dev; 662 663 if (packet_is_spoofed(skb, iph, tunnel)) { 664 tunnel->dev->stats.rx_errors++; 665 goto out; 666 } 667 668 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 669 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 670 goto out; 671 672 err = IP_ECN_decapsulate(iph, skb); 673 if (unlikely(err)) { 674 if (log_ecn_error) 675 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 676 &iph->saddr, iph->tos); 677 if (err > 1) { 678 ++tunnel->dev->stats.rx_frame_errors; 679 ++tunnel->dev->stats.rx_errors; 680 goto out; 681 } 682 } 683 684 tstats = this_cpu_ptr(tunnel->dev->tstats); 685 u64_stats_update_begin(&tstats->syncp); 686 tstats->rx_packets++; 687 tstats->rx_bytes += skb->len; 688 u64_stats_update_end(&tstats->syncp); 689 690 netif_rx(skb); 691 692 return 0; 693 } 694 695 /* no tunnel matched, let upstream know, ipsec may handle it */ 696 return 1; 697 out: 698 kfree_skb(skb); 699 return 0; 700 } 701 702 static const struct tnl_ptk_info ipip_tpi = { 703 /* no tunnel info required for ipip. */ 704 .proto = htons(ETH_P_IP), 705 }; 706 707 #if IS_ENABLED(CONFIG_MPLS) 708 static const struct tnl_ptk_info mplsip_tpi = { 709 /* no tunnel info required for mplsip. */ 710 .proto = htons(ETH_P_MPLS_UC), 711 }; 712 #endif 713 714 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 715 { 716 const struct iphdr *iph; 717 struct ip_tunnel *tunnel; 718 int sifindex; 719 720 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 721 722 iph = ip_hdr(skb); 723 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 724 iph->saddr, iph->daddr, sifindex); 725 if (tunnel) { 726 const struct tnl_ptk_info *tpi; 727 728 if (tunnel->parms.iph.protocol != ipproto && 729 tunnel->parms.iph.protocol != 0) 730 goto drop; 731 732 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 733 goto drop; 734 #if IS_ENABLED(CONFIG_MPLS) 735 if (ipproto == IPPROTO_MPLS) 736 tpi = &mplsip_tpi; 737 else 738 #endif 739 tpi = &ipip_tpi; 740 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 741 goto drop; 742 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 743 } 744 745 return 1; 746 747 drop: 748 kfree_skb(skb); 749 return 0; 750 } 751 752 static int ipip_rcv(struct sk_buff *skb) 753 { 754 return sit_tunnel_rcv(skb, IPPROTO_IPIP); 755 } 756 757 #if IS_ENABLED(CONFIG_MPLS) 758 static int mplsip_rcv(struct sk_buff *skb) 759 { 760 return sit_tunnel_rcv(skb, IPPROTO_MPLS); 761 } 762 #endif 763 764 /* 765 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 766 * stores the embedded IPv4 address in v4dst and returns true. 767 */ 768 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 769 __be32 *v4dst) 770 { 771 #ifdef CONFIG_IPV6_SIT_6RD 772 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 773 tunnel->ip6rd.prefixlen)) { 774 unsigned int pbw0, pbi0; 775 int pbi1; 776 u32 d; 777 778 pbw0 = tunnel->ip6rd.prefixlen >> 5; 779 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 780 781 d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 782 tunnel->ip6rd.relay_prefixlen; 783 784 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 785 if (pbi1 > 0) 786 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 787 (32 - pbi1); 788 789 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 790 return true; 791 } 792 #else 793 if (v6dst->s6_addr16[0] == htons(0x2002)) { 794 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 795 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 796 return true; 797 } 798 #endif 799 return false; 800 } 801 802 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 803 const struct in6_addr *v6dst) 804 { 805 __be32 dst = 0; 806 check_6rd(tunnel, v6dst, &dst); 807 return dst; 808 } 809 810 /* 811 * This function assumes it is being called from dev_queue_xmit() 812 * and that skb is filled properly by that function. 813 */ 814 815 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 816 struct net_device *dev) 817 { 818 struct ip_tunnel *tunnel = netdev_priv(dev); 819 const struct iphdr *tiph = &tunnel->parms.iph; 820 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 821 u8 tos = tunnel->parms.iph.tos; 822 __be16 df = tiph->frag_off; 823 struct rtable *rt; /* Route to the other host */ 824 struct net_device *tdev; /* Device to other host */ 825 unsigned int max_headroom; /* The extra header space needed */ 826 __be32 dst = tiph->daddr; 827 struct flowi4 fl4; 828 int mtu; 829 const struct in6_addr *addr6; 830 int addr_type; 831 u8 ttl; 832 u8 protocol = IPPROTO_IPV6; 833 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 834 835 if (tos == 1) 836 tos = ipv6_get_dsfield(iph6); 837 838 /* ISATAP (RFC4214) - must come before 6to4 */ 839 if (dev->priv_flags & IFF_ISATAP) { 840 struct neighbour *neigh = NULL; 841 bool do_tx_error = false; 842 843 if (skb_dst(skb)) 844 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 845 846 if (!neigh) { 847 net_dbg_ratelimited("nexthop == NULL\n"); 848 goto tx_error; 849 } 850 851 addr6 = (const struct in6_addr *)&neigh->primary_key; 852 addr_type = ipv6_addr_type(addr6); 853 854 if ((addr_type & IPV6_ADDR_UNICAST) && 855 ipv6_addr_is_isatap(addr6)) 856 dst = addr6->s6_addr32[3]; 857 else 858 do_tx_error = true; 859 860 neigh_release(neigh); 861 if (do_tx_error) 862 goto tx_error; 863 } 864 865 if (!dst) 866 dst = try_6rd(tunnel, &iph6->daddr); 867 868 if (!dst) { 869 struct neighbour *neigh = NULL; 870 bool do_tx_error = false; 871 872 if (skb_dst(skb)) 873 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 874 875 if (!neigh) { 876 net_dbg_ratelimited("nexthop == NULL\n"); 877 goto tx_error; 878 } 879 880 addr6 = (const struct in6_addr *)&neigh->primary_key; 881 addr_type = ipv6_addr_type(addr6); 882 883 if (addr_type == IPV6_ADDR_ANY) { 884 addr6 = &ipv6_hdr(skb)->daddr; 885 addr_type = ipv6_addr_type(addr6); 886 } 887 888 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 889 dst = addr6->s6_addr32[3]; 890 else 891 do_tx_error = true; 892 893 neigh_release(neigh); 894 if (do_tx_error) 895 goto tx_error; 896 } 897 898 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 899 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, 900 0, dst, tiph->saddr, 0, 0, 901 sock_net_uid(tunnel->net, NULL)); 902 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 903 904 if (IS_ERR(rt)) { 905 dev->stats.tx_carrier_errors++; 906 goto tx_error_icmp; 907 } 908 if (rt->rt_type != RTN_UNICAST) { 909 ip_rt_put(rt); 910 dev->stats.tx_carrier_errors++; 911 goto tx_error_icmp; 912 } 913 tdev = rt->dst.dev; 914 915 if (tdev == dev) { 916 ip_rt_put(rt); 917 dev->stats.collisions++; 918 goto tx_error; 919 } 920 921 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 922 ip_rt_put(rt); 923 goto tx_error; 924 } 925 926 if (df) { 927 mtu = dst_mtu(&rt->dst) - t_hlen; 928 929 if (mtu < 68) { 930 dev->stats.collisions++; 931 ip_rt_put(rt); 932 goto tx_error; 933 } 934 935 if (mtu < IPV6_MIN_MTU) { 936 mtu = IPV6_MIN_MTU; 937 df = 0; 938 } 939 940 if (tunnel->parms.iph.daddr) 941 skb_dst_update_pmtu(skb, mtu); 942 943 if (skb->len > mtu && !skb_is_gso(skb)) { 944 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 945 ip_rt_put(rt); 946 goto tx_error; 947 } 948 } 949 950 if (tunnel->err_count > 0) { 951 if (time_before(jiffies, 952 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 953 tunnel->err_count--; 954 dst_link_failure(skb); 955 } else 956 tunnel->err_count = 0; 957 } 958 959 /* 960 * Okay, now see if we can stuff it in the buffer as-is. 961 */ 962 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 963 964 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 965 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 966 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 967 if (!new_skb) { 968 ip_rt_put(rt); 969 dev->stats.tx_dropped++; 970 kfree_skb(skb); 971 return NETDEV_TX_OK; 972 } 973 if (skb->sk) 974 skb_set_owner_w(new_skb, skb->sk); 975 dev_kfree_skb(skb); 976 skb = new_skb; 977 iph6 = ipv6_hdr(skb); 978 } 979 ttl = tiph->ttl; 980 if (ttl == 0) 981 ttl = iph6->hop_limit; 982 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 983 984 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { 985 ip_rt_put(rt); 986 goto tx_error; 987 } 988 989 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 990 991 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 992 df, !net_eq(tunnel->net, dev_net(dev))); 993 return NETDEV_TX_OK; 994 995 tx_error_icmp: 996 dst_link_failure(skb); 997 tx_error: 998 kfree_skb(skb); 999 dev->stats.tx_errors++; 1000 return NETDEV_TX_OK; 1001 } 1002 1003 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1004 struct net_device *dev, u8 ipproto) 1005 { 1006 struct ip_tunnel *tunnel = netdev_priv(dev); 1007 const struct iphdr *tiph = &tunnel->parms.iph; 1008 1009 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1010 goto tx_error; 1011 1012 skb_set_inner_ipproto(skb, ipproto); 1013 1014 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1015 return NETDEV_TX_OK; 1016 tx_error: 1017 kfree_skb(skb); 1018 dev->stats.tx_errors++; 1019 return NETDEV_TX_OK; 1020 } 1021 1022 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1023 struct net_device *dev) 1024 { 1025 if (!pskb_inet_may_pull(skb)) 1026 goto tx_err; 1027 1028 switch (skb->protocol) { 1029 case htons(ETH_P_IP): 1030 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1031 break; 1032 case htons(ETH_P_IPV6): 1033 ipip6_tunnel_xmit(skb, dev); 1034 break; 1035 #if IS_ENABLED(CONFIG_MPLS) 1036 case htons(ETH_P_MPLS_UC): 1037 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1038 break; 1039 #endif 1040 default: 1041 goto tx_err; 1042 } 1043 1044 return NETDEV_TX_OK; 1045 1046 tx_err: 1047 dev->stats.tx_errors++; 1048 kfree_skb(skb); 1049 return NETDEV_TX_OK; 1050 1051 } 1052 1053 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1054 { 1055 struct net_device *tdev = NULL; 1056 struct ip_tunnel *tunnel; 1057 const struct iphdr *iph; 1058 struct flowi4 fl4; 1059 1060 tunnel = netdev_priv(dev); 1061 iph = &tunnel->parms.iph; 1062 1063 if (iph->daddr) { 1064 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1065 NULL, 1066 iph->daddr, iph->saddr, 1067 0, 0, 1068 IPPROTO_IPV6, 1069 RT_TOS(iph->tos), 1070 tunnel->parms.link); 1071 1072 if (!IS_ERR(rt)) { 1073 tdev = rt->dst.dev; 1074 ip_rt_put(rt); 1075 } 1076 dev->flags |= IFF_POINTOPOINT; 1077 } 1078 1079 if (!tdev && tunnel->parms.link) 1080 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1081 1082 if (tdev) { 1083 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1084 1085 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); 1086 dev->mtu = tdev->mtu - t_hlen; 1087 if (dev->mtu < IPV6_MIN_MTU) 1088 dev->mtu = IPV6_MIN_MTU; 1089 } 1090 } 1091 1092 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, 1093 __u32 fwmark) 1094 { 1095 struct net *net = t->net; 1096 struct sit_net *sitn = net_generic(net, sit_net_id); 1097 1098 ipip6_tunnel_unlink(sitn, t); 1099 synchronize_net(); 1100 t->parms.iph.saddr = p->iph.saddr; 1101 t->parms.iph.daddr = p->iph.daddr; 1102 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 1103 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1104 ipip6_tunnel_link(sitn, t); 1105 t->parms.iph.ttl = p->iph.ttl; 1106 t->parms.iph.tos = p->iph.tos; 1107 t->parms.iph.frag_off = p->iph.frag_off; 1108 if (t->parms.link != p->link || t->fwmark != fwmark) { 1109 t->parms.link = p->link; 1110 t->fwmark = fwmark; 1111 ipip6_tunnel_bind_dev(t->dev); 1112 } 1113 dst_cache_reset(&t->dst_cache); 1114 netdev_state_change(t->dev); 1115 } 1116 1117 #ifdef CONFIG_IPV6_SIT_6RD 1118 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1119 struct ip_tunnel_6rd *ip6rd) 1120 { 1121 struct in6_addr prefix; 1122 __be32 relay_prefix; 1123 1124 if (ip6rd->relay_prefixlen > 32 || 1125 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1126 return -EINVAL; 1127 1128 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1129 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1130 return -EINVAL; 1131 if (ip6rd->relay_prefixlen) 1132 relay_prefix = ip6rd->relay_prefix & 1133 htonl(0xffffffffUL << 1134 (32 - ip6rd->relay_prefixlen)); 1135 else 1136 relay_prefix = 0; 1137 if (relay_prefix != ip6rd->relay_prefix) 1138 return -EINVAL; 1139 1140 t->ip6rd.prefix = prefix; 1141 t->ip6rd.relay_prefix = relay_prefix; 1142 t->ip6rd.prefixlen = ip6rd->prefixlen; 1143 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1144 dst_cache_reset(&t->dst_cache); 1145 netdev_state_change(t->dev); 1146 return 0; 1147 } 1148 #endif 1149 1150 static bool ipip6_valid_ip_proto(u8 ipproto) 1151 { 1152 return ipproto == IPPROTO_IPV6 || 1153 ipproto == IPPROTO_IPIP || 1154 #if IS_ENABLED(CONFIG_MPLS) 1155 ipproto == IPPROTO_MPLS || 1156 #endif 1157 ipproto == 0; 1158 } 1159 1160 static int 1161 ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1162 { 1163 int err = 0; 1164 struct ip_tunnel_parm p; 1165 struct ip_tunnel_prl prl; 1166 struct ip_tunnel *t = netdev_priv(dev); 1167 struct net *net = t->net; 1168 struct sit_net *sitn = net_generic(net, sit_net_id); 1169 #ifdef CONFIG_IPV6_SIT_6RD 1170 struct ip_tunnel_6rd ip6rd; 1171 #endif 1172 1173 switch (cmd) { 1174 case SIOCGETTUNNEL: 1175 #ifdef CONFIG_IPV6_SIT_6RD 1176 case SIOCGET6RD: 1177 #endif 1178 if (dev == sitn->fb_tunnel_dev) { 1179 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1180 err = -EFAULT; 1181 break; 1182 } 1183 t = ipip6_tunnel_locate(net, &p, 0); 1184 if (!t) 1185 t = netdev_priv(dev); 1186 } 1187 1188 err = -EFAULT; 1189 if (cmd == SIOCGETTUNNEL) { 1190 memcpy(&p, &t->parms, sizeof(p)); 1191 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, 1192 sizeof(p))) 1193 goto done; 1194 #ifdef CONFIG_IPV6_SIT_6RD 1195 } else { 1196 ip6rd.prefix = t->ip6rd.prefix; 1197 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1198 ip6rd.prefixlen = t->ip6rd.prefixlen; 1199 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1200 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, 1201 sizeof(ip6rd))) 1202 goto done; 1203 #endif 1204 } 1205 err = 0; 1206 break; 1207 1208 case SIOCADDTUNNEL: 1209 case SIOCCHGTUNNEL: 1210 err = -EPERM; 1211 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1212 goto done; 1213 1214 err = -EFAULT; 1215 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1216 goto done; 1217 1218 err = -EINVAL; 1219 if (!ipip6_valid_ip_proto(p.iph.protocol)) 1220 goto done; 1221 if (p.iph.version != 4 || 1222 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) 1223 goto done; 1224 if (p.iph.ttl) 1225 p.iph.frag_off |= htons(IP_DF); 1226 1227 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); 1228 1229 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1230 if (t) { 1231 if (t->dev != dev) { 1232 err = -EEXIST; 1233 break; 1234 } 1235 } else { 1236 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || 1237 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { 1238 err = -EINVAL; 1239 break; 1240 } 1241 t = netdev_priv(dev); 1242 } 1243 1244 ipip6_tunnel_update(t, &p, t->fwmark); 1245 } 1246 1247 if (t) { 1248 err = 0; 1249 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) 1250 err = -EFAULT; 1251 } else 1252 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1253 break; 1254 1255 case SIOCDELTUNNEL: 1256 err = -EPERM; 1257 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1258 goto done; 1259 1260 if (dev == sitn->fb_tunnel_dev) { 1261 err = -EFAULT; 1262 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1263 goto done; 1264 err = -ENOENT; 1265 t = ipip6_tunnel_locate(net, &p, 0); 1266 if (!t) 1267 goto done; 1268 err = -EPERM; 1269 if (t == netdev_priv(sitn->fb_tunnel_dev)) 1270 goto done; 1271 dev = t->dev; 1272 } 1273 unregister_netdevice(dev); 1274 err = 0; 1275 break; 1276 1277 case SIOCGETPRL: 1278 err = -EINVAL; 1279 if (dev == sitn->fb_tunnel_dev) 1280 goto done; 1281 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); 1282 break; 1283 1284 case SIOCADDPRL: 1285 case SIOCDELPRL: 1286 case SIOCCHGPRL: 1287 err = -EPERM; 1288 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1289 goto done; 1290 err = -EINVAL; 1291 if (dev == sitn->fb_tunnel_dev) 1292 goto done; 1293 err = -EFAULT; 1294 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) 1295 goto done; 1296 1297 switch (cmd) { 1298 case SIOCDELPRL: 1299 err = ipip6_tunnel_del_prl(t, &prl); 1300 break; 1301 case SIOCADDPRL: 1302 case SIOCCHGPRL: 1303 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 1304 break; 1305 } 1306 dst_cache_reset(&t->dst_cache); 1307 netdev_state_change(dev); 1308 break; 1309 1310 #ifdef CONFIG_IPV6_SIT_6RD 1311 case SIOCADD6RD: 1312 case SIOCCHG6RD: 1313 case SIOCDEL6RD: 1314 err = -EPERM; 1315 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1316 goto done; 1317 1318 err = -EFAULT; 1319 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, 1320 sizeof(ip6rd))) 1321 goto done; 1322 1323 if (cmd != SIOCDEL6RD) { 1324 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1325 if (err < 0) 1326 goto done; 1327 } else 1328 ipip6_tunnel_clone_6rd(dev, sitn); 1329 1330 err = 0; 1331 break; 1332 #endif 1333 1334 default: 1335 err = -EINVAL; 1336 } 1337 1338 done: 1339 return err; 1340 } 1341 1342 static const struct net_device_ops ipip6_netdev_ops = { 1343 .ndo_init = ipip6_tunnel_init, 1344 .ndo_uninit = ipip6_tunnel_uninit, 1345 .ndo_start_xmit = sit_tunnel_xmit, 1346 .ndo_do_ioctl = ipip6_tunnel_ioctl, 1347 .ndo_get_stats64 = ip_tunnel_get_stats64, 1348 .ndo_get_iflink = ip_tunnel_get_iflink, 1349 }; 1350 1351 static void ipip6_dev_free(struct net_device *dev) 1352 { 1353 struct ip_tunnel *tunnel = netdev_priv(dev); 1354 1355 dst_cache_destroy(&tunnel->dst_cache); 1356 free_percpu(dev->tstats); 1357 } 1358 1359 #define SIT_FEATURES (NETIF_F_SG | \ 1360 NETIF_F_FRAGLIST | \ 1361 NETIF_F_HIGHDMA | \ 1362 NETIF_F_GSO_SOFTWARE | \ 1363 NETIF_F_HW_CSUM) 1364 1365 static void ipip6_tunnel_setup(struct net_device *dev) 1366 { 1367 struct ip_tunnel *tunnel = netdev_priv(dev); 1368 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1369 1370 dev->netdev_ops = &ipip6_netdev_ops; 1371 dev->needs_free_netdev = true; 1372 dev->priv_destructor = ipip6_dev_free; 1373 1374 dev->type = ARPHRD_SIT; 1375 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1376 dev->mtu = ETH_DATA_LEN - t_hlen; 1377 dev->min_mtu = IPV6_MIN_MTU; 1378 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1379 dev->flags = IFF_NOARP; 1380 netif_keep_dst(dev); 1381 dev->addr_len = 4; 1382 dev->features |= NETIF_F_LLTX; 1383 dev->features |= SIT_FEATURES; 1384 dev->hw_features |= SIT_FEATURES; 1385 } 1386 1387 static int ipip6_tunnel_init(struct net_device *dev) 1388 { 1389 struct ip_tunnel *tunnel = netdev_priv(dev); 1390 int err; 1391 1392 tunnel->dev = dev; 1393 tunnel->net = dev_net(dev); 1394 strcpy(tunnel->parms.name, dev->name); 1395 1396 ipip6_tunnel_bind_dev(dev); 1397 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1398 if (!dev->tstats) 1399 return -ENOMEM; 1400 1401 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1402 if (err) { 1403 free_percpu(dev->tstats); 1404 dev->tstats = NULL; 1405 return err; 1406 } 1407 1408 return 0; 1409 } 1410 1411 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1412 { 1413 struct ip_tunnel *tunnel = netdev_priv(dev); 1414 struct iphdr *iph = &tunnel->parms.iph; 1415 struct net *net = dev_net(dev); 1416 struct sit_net *sitn = net_generic(net, sit_net_id); 1417 1418 iph->version = 4; 1419 iph->protocol = IPPROTO_IPV6; 1420 iph->ihl = 5; 1421 iph->ttl = 64; 1422 1423 dev_hold(dev); 1424 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1425 } 1426 1427 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1428 struct netlink_ext_ack *extack) 1429 { 1430 u8 proto; 1431 1432 if (!data || !data[IFLA_IPTUN_PROTO]) 1433 return 0; 1434 1435 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1436 if (!ipip6_valid_ip_proto(proto)) 1437 return -EINVAL; 1438 1439 return 0; 1440 } 1441 1442 static void ipip6_netlink_parms(struct nlattr *data[], 1443 struct ip_tunnel_parm *parms, 1444 __u32 *fwmark) 1445 { 1446 memset(parms, 0, sizeof(*parms)); 1447 1448 parms->iph.version = 4; 1449 parms->iph.protocol = IPPROTO_IPV6; 1450 parms->iph.ihl = 5; 1451 parms->iph.ttl = 64; 1452 1453 if (!data) 1454 return; 1455 1456 if (data[IFLA_IPTUN_LINK]) 1457 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1458 1459 if (data[IFLA_IPTUN_LOCAL]) 1460 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1461 1462 if (data[IFLA_IPTUN_REMOTE]) 1463 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1464 1465 if (data[IFLA_IPTUN_TTL]) { 1466 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1467 if (parms->iph.ttl) 1468 parms->iph.frag_off = htons(IP_DF); 1469 } 1470 1471 if (data[IFLA_IPTUN_TOS]) 1472 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1473 1474 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1475 parms->iph.frag_off = htons(IP_DF); 1476 1477 if (data[IFLA_IPTUN_FLAGS]) 1478 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1479 1480 if (data[IFLA_IPTUN_PROTO]) 1481 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1482 1483 if (data[IFLA_IPTUN_FWMARK]) 1484 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1485 } 1486 1487 /* This function returns true when ENCAP attributes are present in the nl msg */ 1488 static bool ipip6_netlink_encap_parms(struct nlattr *data[], 1489 struct ip_tunnel_encap *ipencap) 1490 { 1491 bool ret = false; 1492 1493 memset(ipencap, 0, sizeof(*ipencap)); 1494 1495 if (!data) 1496 return ret; 1497 1498 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1499 ret = true; 1500 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1501 } 1502 1503 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1504 ret = true; 1505 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1506 } 1507 1508 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1509 ret = true; 1510 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1511 } 1512 1513 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1514 ret = true; 1515 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1516 } 1517 1518 return ret; 1519 } 1520 1521 #ifdef CONFIG_IPV6_SIT_6RD 1522 /* This function returns true when 6RD attributes are present in the nl msg */ 1523 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1524 struct ip_tunnel_6rd *ip6rd) 1525 { 1526 bool ret = false; 1527 memset(ip6rd, 0, sizeof(*ip6rd)); 1528 1529 if (!data) 1530 return ret; 1531 1532 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1533 ret = true; 1534 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1535 } 1536 1537 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1538 ret = true; 1539 ip6rd->relay_prefix = 1540 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1541 } 1542 1543 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1544 ret = true; 1545 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1546 } 1547 1548 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1549 ret = true; 1550 ip6rd->relay_prefixlen = 1551 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1552 } 1553 1554 return ret; 1555 } 1556 #endif 1557 1558 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1559 struct nlattr *tb[], struct nlattr *data[], 1560 struct netlink_ext_ack *extack) 1561 { 1562 struct net *net = dev_net(dev); 1563 struct ip_tunnel *nt; 1564 struct ip_tunnel_encap ipencap; 1565 #ifdef CONFIG_IPV6_SIT_6RD 1566 struct ip_tunnel_6rd ip6rd; 1567 #endif 1568 int err; 1569 1570 nt = netdev_priv(dev); 1571 1572 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1573 err = ip_tunnel_encap_setup(nt, &ipencap); 1574 if (err < 0) 1575 return err; 1576 } 1577 1578 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1579 1580 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1581 return -EEXIST; 1582 1583 err = ipip6_tunnel_create(dev); 1584 if (err < 0) 1585 return err; 1586 1587 if (tb[IFLA_MTU]) { 1588 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1589 1590 if (mtu >= IPV6_MIN_MTU && 1591 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1592 dev->mtu = mtu; 1593 } 1594 1595 #ifdef CONFIG_IPV6_SIT_6RD 1596 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1597 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1598 #endif 1599 1600 return err; 1601 } 1602 1603 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1604 struct nlattr *data[], 1605 struct netlink_ext_ack *extack) 1606 { 1607 struct ip_tunnel *t = netdev_priv(dev); 1608 struct ip_tunnel_parm p; 1609 struct ip_tunnel_encap ipencap; 1610 struct net *net = t->net; 1611 struct sit_net *sitn = net_generic(net, sit_net_id); 1612 #ifdef CONFIG_IPV6_SIT_6RD 1613 struct ip_tunnel_6rd ip6rd; 1614 #endif 1615 __u32 fwmark = t->fwmark; 1616 int err; 1617 1618 if (dev == sitn->fb_tunnel_dev) 1619 return -EINVAL; 1620 1621 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1622 err = ip_tunnel_encap_setup(t, &ipencap); 1623 if (err < 0) 1624 return err; 1625 } 1626 1627 ipip6_netlink_parms(data, &p, &fwmark); 1628 1629 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1630 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1631 return -EINVAL; 1632 1633 t = ipip6_tunnel_locate(net, &p, 0); 1634 1635 if (t) { 1636 if (t->dev != dev) 1637 return -EEXIST; 1638 } else 1639 t = netdev_priv(dev); 1640 1641 ipip6_tunnel_update(t, &p, fwmark); 1642 1643 #ifdef CONFIG_IPV6_SIT_6RD 1644 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1645 return ipip6_tunnel_update_6rd(t, &ip6rd); 1646 #endif 1647 1648 return 0; 1649 } 1650 1651 static size_t ipip6_get_size(const struct net_device *dev) 1652 { 1653 return 1654 /* IFLA_IPTUN_LINK */ 1655 nla_total_size(4) + 1656 /* IFLA_IPTUN_LOCAL */ 1657 nla_total_size(4) + 1658 /* IFLA_IPTUN_REMOTE */ 1659 nla_total_size(4) + 1660 /* IFLA_IPTUN_TTL */ 1661 nla_total_size(1) + 1662 /* IFLA_IPTUN_TOS */ 1663 nla_total_size(1) + 1664 /* IFLA_IPTUN_PMTUDISC */ 1665 nla_total_size(1) + 1666 /* IFLA_IPTUN_FLAGS */ 1667 nla_total_size(2) + 1668 /* IFLA_IPTUN_PROTO */ 1669 nla_total_size(1) + 1670 #ifdef CONFIG_IPV6_SIT_6RD 1671 /* IFLA_IPTUN_6RD_PREFIX */ 1672 nla_total_size(sizeof(struct in6_addr)) + 1673 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1674 nla_total_size(4) + 1675 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1676 nla_total_size(2) + 1677 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1678 nla_total_size(2) + 1679 #endif 1680 /* IFLA_IPTUN_ENCAP_TYPE */ 1681 nla_total_size(2) + 1682 /* IFLA_IPTUN_ENCAP_FLAGS */ 1683 nla_total_size(2) + 1684 /* IFLA_IPTUN_ENCAP_SPORT */ 1685 nla_total_size(2) + 1686 /* IFLA_IPTUN_ENCAP_DPORT */ 1687 nla_total_size(2) + 1688 /* IFLA_IPTUN_FWMARK */ 1689 nla_total_size(4) + 1690 0; 1691 } 1692 1693 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1694 { 1695 struct ip_tunnel *tunnel = netdev_priv(dev); 1696 struct ip_tunnel_parm *parm = &tunnel->parms; 1697 1698 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1699 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1700 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1701 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1702 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1703 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1704 !!(parm->iph.frag_off & htons(IP_DF))) || 1705 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1706 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || 1707 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1708 goto nla_put_failure; 1709 1710 #ifdef CONFIG_IPV6_SIT_6RD 1711 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1712 &tunnel->ip6rd.prefix) || 1713 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1714 tunnel->ip6rd.relay_prefix) || 1715 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1716 tunnel->ip6rd.prefixlen) || 1717 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1718 tunnel->ip6rd.relay_prefixlen)) 1719 goto nla_put_failure; 1720 #endif 1721 1722 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1723 tunnel->encap.type) || 1724 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1725 tunnel->encap.sport) || 1726 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1727 tunnel->encap.dport) || 1728 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1729 tunnel->encap.flags)) 1730 goto nla_put_failure; 1731 1732 return 0; 1733 1734 nla_put_failure: 1735 return -EMSGSIZE; 1736 } 1737 1738 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1739 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1740 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1741 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1742 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1743 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1744 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1745 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1746 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1747 #ifdef CONFIG_IPV6_SIT_6RD 1748 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1749 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1750 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1751 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1752 #endif 1753 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1754 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1755 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1756 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1757 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1758 }; 1759 1760 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1761 { 1762 struct net *net = dev_net(dev); 1763 struct sit_net *sitn = net_generic(net, sit_net_id); 1764 1765 if (dev != sitn->fb_tunnel_dev) 1766 unregister_netdevice_queue(dev, head); 1767 } 1768 1769 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1770 .kind = "sit", 1771 .maxtype = IFLA_IPTUN_MAX, 1772 .policy = ipip6_policy, 1773 .priv_size = sizeof(struct ip_tunnel), 1774 .setup = ipip6_tunnel_setup, 1775 .validate = ipip6_validate, 1776 .newlink = ipip6_newlink, 1777 .changelink = ipip6_changelink, 1778 .get_size = ipip6_get_size, 1779 .fill_info = ipip6_fill_info, 1780 .dellink = ipip6_dellink, 1781 .get_link_net = ip_tunnel_get_link_net, 1782 }; 1783 1784 static struct xfrm_tunnel sit_handler __read_mostly = { 1785 .handler = ipip6_rcv, 1786 .err_handler = ipip6_err, 1787 .priority = 1, 1788 }; 1789 1790 static struct xfrm_tunnel ipip_handler __read_mostly = { 1791 .handler = ipip_rcv, 1792 .err_handler = ipip6_err, 1793 .priority = 2, 1794 }; 1795 1796 #if IS_ENABLED(CONFIG_MPLS) 1797 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1798 .handler = mplsip_rcv, 1799 .err_handler = ipip6_err, 1800 .priority = 2, 1801 }; 1802 #endif 1803 1804 static void __net_exit sit_destroy_tunnels(struct net *net, 1805 struct list_head *head) 1806 { 1807 struct sit_net *sitn = net_generic(net, sit_net_id); 1808 struct net_device *dev, *aux; 1809 int prio; 1810 1811 for_each_netdev_safe(net, dev, aux) 1812 if (dev->rtnl_link_ops == &sit_link_ops) 1813 unregister_netdevice_queue(dev, head); 1814 1815 for (prio = 1; prio < 4; prio++) { 1816 int h; 1817 for (h = 0; h < IP6_SIT_HASH_SIZE; h++) { 1818 struct ip_tunnel *t; 1819 1820 t = rtnl_dereference(sitn->tunnels[prio][h]); 1821 while (t) { 1822 /* If dev is in the same netns, it has already 1823 * been added to the list by the previous loop. 1824 */ 1825 if (!net_eq(dev_net(t->dev), net)) 1826 unregister_netdevice_queue(t->dev, 1827 head); 1828 t = rtnl_dereference(t->next); 1829 } 1830 } 1831 } 1832 } 1833 1834 static int __net_init sit_init_net(struct net *net) 1835 { 1836 struct sit_net *sitn = net_generic(net, sit_net_id); 1837 struct ip_tunnel *t; 1838 int err; 1839 1840 sitn->tunnels[0] = sitn->tunnels_wc; 1841 sitn->tunnels[1] = sitn->tunnels_l; 1842 sitn->tunnels[2] = sitn->tunnels_r; 1843 sitn->tunnels[3] = sitn->tunnels_r_l; 1844 1845 if (!net_has_fallback_tunnels(net)) 1846 return 0; 1847 1848 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1849 NET_NAME_UNKNOWN, 1850 ipip6_tunnel_setup); 1851 if (!sitn->fb_tunnel_dev) { 1852 err = -ENOMEM; 1853 goto err_alloc_dev; 1854 } 1855 dev_net_set(sitn->fb_tunnel_dev, net); 1856 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1857 /* FB netdevice is special: we have one, and only one per netns. 1858 * Allowing to move it to another netns is clearly unsafe. 1859 */ 1860 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1861 1862 err = register_netdev(sitn->fb_tunnel_dev); 1863 if (err) 1864 goto err_reg_dev; 1865 1866 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1867 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1868 1869 t = netdev_priv(sitn->fb_tunnel_dev); 1870 1871 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1872 return 0; 1873 1874 err_reg_dev: 1875 ipip6_dev_free(sitn->fb_tunnel_dev); 1876 free_netdev(sitn->fb_tunnel_dev); 1877 err_alloc_dev: 1878 return err; 1879 } 1880 1881 static void __net_exit sit_exit_batch_net(struct list_head *net_list) 1882 { 1883 LIST_HEAD(list); 1884 struct net *net; 1885 1886 rtnl_lock(); 1887 list_for_each_entry(net, net_list, exit_list) 1888 sit_destroy_tunnels(net, &list); 1889 1890 unregister_netdevice_many(&list); 1891 rtnl_unlock(); 1892 } 1893 1894 static struct pernet_operations sit_net_ops = { 1895 .init = sit_init_net, 1896 .exit_batch = sit_exit_batch_net, 1897 .id = &sit_net_id, 1898 .size = sizeof(struct sit_net), 1899 }; 1900 1901 static void __exit sit_cleanup(void) 1902 { 1903 rtnl_link_unregister(&sit_link_ops); 1904 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1905 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1906 #if IS_ENABLED(CONFIG_MPLS) 1907 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1908 #endif 1909 1910 unregister_pernet_device(&sit_net_ops); 1911 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1912 } 1913 1914 static int __init sit_init(void) 1915 { 1916 int err; 1917 1918 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1919 1920 err = register_pernet_device(&sit_net_ops); 1921 if (err < 0) 1922 return err; 1923 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1924 if (err < 0) { 1925 pr_info("%s: can't register ip6ip4\n", __func__); 1926 goto xfrm_tunnel_failed; 1927 } 1928 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1929 if (err < 0) { 1930 pr_info("%s: can't register ip4ip4\n", __func__); 1931 goto xfrm_tunnel4_failed; 1932 } 1933 #if IS_ENABLED(CONFIG_MPLS) 1934 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1935 if (err < 0) { 1936 pr_info("%s: can't register mplsip\n", __func__); 1937 goto xfrm_tunnel_mpls_failed; 1938 } 1939 #endif 1940 err = rtnl_link_register(&sit_link_ops); 1941 if (err < 0) 1942 goto rtnl_link_failed; 1943 1944 out: 1945 return err; 1946 1947 rtnl_link_failed: 1948 #if IS_ENABLED(CONFIG_MPLS) 1949 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1950 xfrm_tunnel_mpls_failed: 1951 #endif 1952 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1953 xfrm_tunnel4_failed: 1954 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1955 xfrm_tunnel_failed: 1956 unregister_pernet_device(&sit_net_ops); 1957 goto out; 1958 } 1959 1960 module_init(sit_init); 1961 module_exit(sit_cleanup); 1962 MODULE_LICENSE("GPL"); 1963 MODULE_ALIAS_RTNL_LINK("sit"); 1964 MODULE_ALIAS_NETDEV("sit0"); 1965