1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 * 10 * Changes: 11 * Roger Venning <r.venning@telstra.com>: 6to4 support 12 * Nate Thompson <nate@thebog.net>: 6to4 support 13 * Fred Templin <fred.l.templin@boeing.com>: isatap support 14 */ 15 16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18 #include <linux/module.h> 19 #include <linux/capability.h> 20 #include <linux/errno.h> 21 #include <linux/types.h> 22 #include <linux/socket.h> 23 #include <linux/sockios.h> 24 #include <linux/net.h> 25 #include <linux/in6.h> 26 #include <linux/netdevice.h> 27 #include <linux/if_arp.h> 28 #include <linux/icmp.h> 29 #include <linux/slab.h> 30 #include <linux/uaccess.h> 31 #include <linux/init.h> 32 #include <linux/netfilter_ipv4.h> 33 #include <linux/if_ether.h> 34 35 #include <net/sock.h> 36 #include <net/snmp.h> 37 38 #include <net/ipv6.h> 39 #include <net/protocol.h> 40 #include <net/transp_v6.h> 41 #include <net/ip6_fib.h> 42 #include <net/ip6_route.h> 43 #include <net/ndisc.h> 44 #include <net/addrconf.h> 45 #include <net/ip.h> 46 #include <net/udp.h> 47 #include <net/icmp.h> 48 #include <net/ip_tunnels.h> 49 #include <net/inet_ecn.h> 50 #include <net/xfrm.h> 51 #include <net/dsfield.h> 52 #include <net/net_namespace.h> 53 #include <net/netns/generic.h> 54 55 /* 56 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c 57 58 For comments look at net/ipv4/ip_gre.c --ANK 59 */ 60 61 #define IP6_SIT_HASH_SIZE 16 62 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) 63 64 static bool log_ecn_error = true; 65 module_param(log_ecn_error, bool, 0644); 66 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 67 68 static int ipip6_tunnel_init(struct net_device *dev); 69 static void ipip6_tunnel_setup(struct net_device *dev); 70 static void ipip6_dev_free(struct net_device *dev); 71 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 72 __be32 *v4dst); 73 static struct rtnl_link_ops sit_link_ops __read_mostly; 74 75 static unsigned int sit_net_id __read_mostly; 76 struct sit_net { 77 struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; 78 struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; 79 struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; 80 struct ip_tunnel __rcu *tunnels_wc[1]; 81 struct ip_tunnel __rcu **tunnels[4]; 82 83 struct net_device *fb_tunnel_dev; 84 }; 85 86 /* 87 * Must be invoked with rcu_read_lock 88 */ 89 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, 90 struct net_device *dev, 91 __be32 remote, __be32 local, 92 int sifindex) 93 { 94 unsigned int h0 = HASH(remote); 95 unsigned int h1 = HASH(local); 96 struct ip_tunnel *t; 97 struct sit_net *sitn = net_generic(net, sit_net_id); 98 int ifindex = dev ? dev->ifindex : 0; 99 100 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { 101 if (local == t->parms.iph.saddr && 102 remote == t->parms.iph.daddr && 103 (!dev || !t->parms.link || ifindex == t->parms.link || 104 sifindex == t->parms.link) && 105 (t->dev->flags & IFF_UP)) 106 return t; 107 } 108 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { 109 if (remote == t->parms.iph.daddr && 110 (!dev || !t->parms.link || ifindex == t->parms.link || 111 sifindex == t->parms.link) && 112 (t->dev->flags & IFF_UP)) 113 return t; 114 } 115 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { 116 if (local == t->parms.iph.saddr && 117 (!dev || !t->parms.link || ifindex == t->parms.link || 118 sifindex == t->parms.link) && 119 (t->dev->flags & IFF_UP)) 120 return t; 121 } 122 t = rcu_dereference(sitn->tunnels_wc[0]); 123 if (t && (t->dev->flags & IFF_UP)) 124 return t; 125 return NULL; 126 } 127 128 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, 129 struct ip_tunnel_parm *parms) 130 { 131 __be32 remote = parms->iph.daddr; 132 __be32 local = parms->iph.saddr; 133 unsigned int h = 0; 134 int prio = 0; 135 136 if (remote) { 137 prio |= 2; 138 h ^= HASH(remote); 139 } 140 if (local) { 141 prio |= 1; 142 h ^= HASH(local); 143 } 144 return &sitn->tunnels[prio][h]; 145 } 146 147 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, 148 struct ip_tunnel *t) 149 { 150 return __ipip6_bucket(sitn, &t->parms); 151 } 152 153 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) 154 { 155 struct ip_tunnel __rcu **tp; 156 struct ip_tunnel *iter; 157 158 for (tp = ipip6_bucket(sitn, t); 159 (iter = rtnl_dereference(*tp)) != NULL; 160 tp = &iter->next) { 161 if (t == iter) { 162 rcu_assign_pointer(*tp, t->next); 163 break; 164 } 165 } 166 } 167 168 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) 169 { 170 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); 171 172 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 173 rcu_assign_pointer(*tp, t); 174 } 175 176 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) 177 { 178 #ifdef CONFIG_IPV6_SIT_6RD 179 struct ip_tunnel *t = netdev_priv(dev); 180 181 if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) { 182 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); 183 t->ip6rd.relay_prefix = 0; 184 t->ip6rd.prefixlen = 16; 185 t->ip6rd.relay_prefixlen = 0; 186 } else { 187 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); 188 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); 189 } 190 #endif 191 } 192 193 static int ipip6_tunnel_create(struct net_device *dev) 194 { 195 struct ip_tunnel *t = netdev_priv(dev); 196 struct net *net = dev_net(dev); 197 struct sit_net *sitn = net_generic(net, sit_net_id); 198 int err; 199 200 memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); 201 memcpy(dev->broadcast, &t->parms.iph.daddr, 4); 202 203 if ((__force u16)t->parms.i_flags & SIT_ISATAP) 204 dev->priv_flags |= IFF_ISATAP; 205 206 dev->rtnl_link_ops = &sit_link_ops; 207 208 err = register_netdevice(dev); 209 if (err < 0) 210 goto out; 211 212 ipip6_tunnel_clone_6rd(dev, sitn); 213 214 dev_hold(dev); 215 216 ipip6_tunnel_link(sitn, t); 217 return 0; 218 219 out: 220 return err; 221 } 222 223 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, 224 struct ip_tunnel_parm *parms, int create) 225 { 226 __be32 remote = parms->iph.daddr; 227 __be32 local = parms->iph.saddr; 228 struct ip_tunnel *t, *nt; 229 struct ip_tunnel __rcu **tp; 230 struct net_device *dev; 231 char name[IFNAMSIZ]; 232 struct sit_net *sitn = net_generic(net, sit_net_id); 233 234 for (tp = __ipip6_bucket(sitn, parms); 235 (t = rtnl_dereference(*tp)) != NULL; 236 tp = &t->next) { 237 if (local == t->parms.iph.saddr && 238 remote == t->parms.iph.daddr && 239 parms->link == t->parms.link) { 240 if (create) 241 return NULL; 242 else 243 return t; 244 } 245 } 246 if (!create) 247 goto failed; 248 249 if (parms->name[0]) { 250 if (!dev_valid_name(parms->name)) 251 goto failed; 252 strlcpy(name, parms->name, IFNAMSIZ); 253 } else { 254 strcpy(name, "sit%d"); 255 } 256 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 257 ipip6_tunnel_setup); 258 if (!dev) 259 return NULL; 260 261 dev_net_set(dev, net); 262 263 nt = netdev_priv(dev); 264 265 nt->parms = *parms; 266 if (ipip6_tunnel_create(dev) < 0) 267 goto failed_free; 268 269 return nt; 270 271 failed_free: 272 free_netdev(dev); 273 failed: 274 return NULL; 275 } 276 277 #define for_each_prl_rcu(start) \ 278 for (prl = rcu_dereference(start); \ 279 prl; \ 280 prl = rcu_dereference(prl->next)) 281 282 static struct ip_tunnel_prl_entry * 283 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 284 { 285 struct ip_tunnel_prl_entry *prl; 286 287 for_each_prl_rcu(t->prl) 288 if (prl->addr == addr) 289 break; 290 return prl; 291 292 } 293 294 static int ipip6_tunnel_get_prl(struct ip_tunnel *t, 295 struct ip_tunnel_prl __user *a) 296 { 297 struct ip_tunnel_prl kprl, *kp; 298 struct ip_tunnel_prl_entry *prl; 299 unsigned int cmax, c = 0, ca, len; 300 int ret = 0; 301 302 if (copy_from_user(&kprl, a, sizeof(kprl))) 303 return -EFAULT; 304 cmax = kprl.datalen / sizeof(kprl); 305 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 306 cmax = 1; 307 308 /* For simple GET or for root users, 309 * we try harder to allocate. 310 */ 311 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 312 kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) : 313 NULL; 314 315 rcu_read_lock(); 316 317 ca = t->prl_count < cmax ? t->prl_count : cmax; 318 319 if (!kp) { 320 /* We don't try hard to allocate much memory for 321 * non-root users. 322 * For root users, retry allocating enough memory for 323 * the answer. 324 */ 325 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); 326 if (!kp) { 327 ret = -ENOMEM; 328 goto out; 329 } 330 } 331 332 c = 0; 333 for_each_prl_rcu(t->prl) { 334 if (c >= cmax) 335 break; 336 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 337 continue; 338 kp[c].addr = prl->addr; 339 kp[c].flags = prl->flags; 340 c++; 341 if (kprl.addr != htonl(INADDR_ANY)) 342 break; 343 } 344 out: 345 rcu_read_unlock(); 346 347 len = sizeof(*kp) * c; 348 ret = 0; 349 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 350 ret = -EFAULT; 351 352 kfree(kp); 353 354 return ret; 355 } 356 357 static int 358 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 359 { 360 struct ip_tunnel_prl_entry *p; 361 int err = 0; 362 363 if (a->addr == htonl(INADDR_ANY)) 364 return -EINVAL; 365 366 ASSERT_RTNL(); 367 368 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 369 if (p->addr == a->addr) { 370 if (chg) { 371 p->flags = a->flags; 372 goto out; 373 } 374 err = -EEXIST; 375 goto out; 376 } 377 } 378 379 if (chg) { 380 err = -ENXIO; 381 goto out; 382 } 383 384 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 385 if (!p) { 386 err = -ENOBUFS; 387 goto out; 388 } 389 390 p->next = t->prl; 391 p->addr = a->addr; 392 p->flags = a->flags; 393 t->prl_count++; 394 rcu_assign_pointer(t->prl, p); 395 out: 396 return err; 397 } 398 399 static void prl_list_destroy_rcu(struct rcu_head *head) 400 { 401 struct ip_tunnel_prl_entry *p, *n; 402 403 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 404 do { 405 n = rcu_dereference_protected(p->next, 1); 406 kfree(p); 407 p = n; 408 } while (p); 409 } 410 411 static int 412 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 413 { 414 struct ip_tunnel_prl_entry *x; 415 struct ip_tunnel_prl_entry __rcu **p; 416 int err = 0; 417 418 ASSERT_RTNL(); 419 420 if (a && a->addr != htonl(INADDR_ANY)) { 421 for (p = &t->prl; 422 (x = rtnl_dereference(*p)) != NULL; 423 p = &x->next) { 424 if (x->addr == a->addr) { 425 *p = x->next; 426 kfree_rcu(x, rcu_head); 427 t->prl_count--; 428 goto out; 429 } 430 } 431 err = -ENXIO; 432 } else { 433 x = rtnl_dereference(t->prl); 434 if (x) { 435 t->prl_count = 0; 436 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 437 t->prl = NULL; 438 } 439 } 440 out: 441 return err; 442 } 443 444 static int 445 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 446 { 447 struct ip_tunnel_prl_entry *p; 448 int ok = 1; 449 450 rcu_read_lock(); 451 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 452 if (p) { 453 if (p->flags & PRL_DEFAULT) 454 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 455 else 456 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 457 } else { 458 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 459 460 if (ipv6_addr_is_isatap(addr6) && 461 (addr6->s6_addr32[3] == iph->saddr) && 462 ipv6_chk_prefix(addr6, t->dev)) 463 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 464 else 465 ok = 0; 466 } 467 rcu_read_unlock(); 468 return ok; 469 } 470 471 static void ipip6_tunnel_uninit(struct net_device *dev) 472 { 473 struct ip_tunnel *tunnel = netdev_priv(dev); 474 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); 475 476 if (dev == sitn->fb_tunnel_dev) { 477 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 478 } else { 479 ipip6_tunnel_unlink(sitn, tunnel); 480 ipip6_tunnel_del_prl(tunnel, NULL); 481 } 482 dst_cache_reset(&tunnel->dst_cache); 483 dev_put(dev); 484 } 485 486 static int ipip6_err(struct sk_buff *skb, u32 info) 487 { 488 const struct iphdr *iph = (const struct iphdr *)skb->data; 489 const int type = icmp_hdr(skb)->type; 490 const int code = icmp_hdr(skb)->code; 491 unsigned int data_len = 0; 492 struct ip_tunnel *t; 493 int sifindex; 494 int err; 495 496 switch (type) { 497 default: 498 case ICMP_PARAMETERPROB: 499 return 0; 500 501 case ICMP_DEST_UNREACH: 502 switch (code) { 503 case ICMP_SR_FAILED: 504 /* Impossible event. */ 505 return 0; 506 default: 507 /* All others are translated to HOST_UNREACH. 508 rfc2003 contains "deep thoughts" about NET_UNREACH, 509 I believe they are just ether pollution. --ANK 510 */ 511 break; 512 } 513 break; 514 case ICMP_TIME_EXCEEDED: 515 if (code != ICMP_EXC_TTL) 516 return 0; 517 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ 518 break; 519 case ICMP_REDIRECT: 520 break; 521 } 522 523 err = -ENOENT; 524 525 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 526 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 527 iph->daddr, iph->saddr, sifindex); 528 if (!t) 529 goto out; 530 531 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 532 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 533 t->parms.link, iph->protocol); 534 err = 0; 535 goto out; 536 } 537 if (type == ICMP_REDIRECT) { 538 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 539 iph->protocol); 540 err = 0; 541 goto out; 542 } 543 544 err = 0; 545 if (__in6_dev_get(skb->dev) && 546 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 547 goto out; 548 549 if (t->parms.iph.daddr == 0) 550 goto out; 551 552 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 553 goto out; 554 555 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 556 t->err_count++; 557 else 558 t->err_count = 1; 559 t->err_time = jiffies; 560 out: 561 return err; 562 } 563 564 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 565 const struct in6_addr *v6addr) 566 { 567 __be32 v4embed = 0; 568 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 569 return true; 570 return false; 571 } 572 573 /* Checks if an address matches an address on the tunnel interface. 574 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 575 * Long story: 576 * This function is called after we considered the packet as spoofed 577 * in is_spoofed_6rd. 578 * We may have a router that is doing NAT for proto 41 packets 579 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 580 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 581 * function will return true, dropping the packet. 582 * But, we can still check if is spoofed against the IP 583 * addresses associated with the interface. 584 */ 585 static bool only_dnatted(const struct ip_tunnel *tunnel, 586 const struct in6_addr *v6dst) 587 { 588 int prefix_len; 589 590 #ifdef CONFIG_IPV6_SIT_6RD 591 prefix_len = tunnel->ip6rd.prefixlen + 32 592 - tunnel->ip6rd.relay_prefixlen; 593 #else 594 prefix_len = 48; 595 #endif 596 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 597 } 598 599 /* Returns true if a packet is spoofed */ 600 static bool packet_is_spoofed(struct sk_buff *skb, 601 const struct iphdr *iph, 602 struct ip_tunnel *tunnel) 603 { 604 const struct ipv6hdr *ipv6h; 605 606 if (tunnel->dev->priv_flags & IFF_ISATAP) { 607 if (!isatap_chksrc(skb, iph, tunnel)) 608 return true; 609 610 return false; 611 } 612 613 if (tunnel->dev->flags & IFF_POINTOPOINT) 614 return false; 615 616 ipv6h = ipv6_hdr(skb); 617 618 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 619 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 620 &iph->saddr, &ipv6h->saddr, 621 &iph->daddr, &ipv6h->daddr); 622 return true; 623 } 624 625 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 626 return false; 627 628 if (only_dnatted(tunnel, &ipv6h->daddr)) 629 return false; 630 631 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 632 &iph->saddr, &ipv6h->saddr, 633 &iph->daddr, &ipv6h->daddr); 634 return true; 635 } 636 637 static int ipip6_rcv(struct sk_buff *skb) 638 { 639 const struct iphdr *iph = ip_hdr(skb); 640 struct ip_tunnel *tunnel; 641 int sifindex; 642 int err; 643 644 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 645 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 646 iph->saddr, iph->daddr, sifindex); 647 if (tunnel) { 648 struct pcpu_sw_netstats *tstats; 649 650 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 651 tunnel->parms.iph.protocol != 0) 652 goto out; 653 654 skb->mac_header = skb->network_header; 655 skb_reset_network_header(skb); 656 IPCB(skb)->flags = 0; 657 skb->dev = tunnel->dev; 658 659 if (packet_is_spoofed(skb, iph, tunnel)) { 660 tunnel->dev->stats.rx_errors++; 661 goto out; 662 } 663 664 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 665 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 666 goto out; 667 668 /* skb can be uncloned in iptunnel_pull_header, so 669 * old iph is no longer valid 670 */ 671 iph = (const struct iphdr *)skb_mac_header(skb); 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 = tunnel->ip6rd.relay_prefixlen < 32 ? 782 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 783 tunnel->ip6rd.relay_prefixlen : 0; 784 785 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 786 if (pbi1 > 0) 787 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 788 (32 - pbi1); 789 790 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 791 return true; 792 } 793 #else 794 if (v6dst->s6_addr16[0] == htons(0x2002)) { 795 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 796 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 797 return true; 798 } 799 #endif 800 return false; 801 } 802 803 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 804 const struct in6_addr *v6dst) 805 { 806 __be32 dst = 0; 807 check_6rd(tunnel, v6dst, &dst); 808 return dst; 809 } 810 811 /* 812 * This function assumes it is being called from dev_queue_xmit() 813 * and that skb is filled properly by that function. 814 */ 815 816 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 817 struct net_device *dev) 818 { 819 struct ip_tunnel *tunnel = netdev_priv(dev); 820 const struct iphdr *tiph = &tunnel->parms.iph; 821 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 822 u8 tos = tunnel->parms.iph.tos; 823 __be16 df = tiph->frag_off; 824 struct rtable *rt; /* Route to the other host */ 825 struct net_device *tdev; /* Device to other host */ 826 unsigned int max_headroom; /* The extra header space needed */ 827 __be32 dst = tiph->daddr; 828 struct flowi4 fl4; 829 int mtu; 830 const struct in6_addr *addr6; 831 int addr_type; 832 u8 ttl; 833 u8 protocol = IPPROTO_IPV6; 834 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 835 836 if (tos == 1) 837 tos = ipv6_get_dsfield(iph6); 838 839 /* ISATAP (RFC4214) - must come before 6to4 */ 840 if (dev->priv_flags & IFF_ISATAP) { 841 struct neighbour *neigh = NULL; 842 bool do_tx_error = false; 843 844 if (skb_dst(skb)) 845 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 846 847 if (!neigh) { 848 net_dbg_ratelimited("nexthop == NULL\n"); 849 goto tx_error; 850 } 851 852 addr6 = (const struct in6_addr *)&neigh->primary_key; 853 addr_type = ipv6_addr_type(addr6); 854 855 if ((addr_type & IPV6_ADDR_UNICAST) && 856 ipv6_addr_is_isatap(addr6)) 857 dst = addr6->s6_addr32[3]; 858 else 859 do_tx_error = true; 860 861 neigh_release(neigh); 862 if (do_tx_error) 863 goto tx_error; 864 } 865 866 if (!dst) 867 dst = try_6rd(tunnel, &iph6->daddr); 868 869 if (!dst) { 870 struct neighbour *neigh = NULL; 871 bool do_tx_error = false; 872 873 if (skb_dst(skb)) 874 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 875 876 if (!neigh) { 877 net_dbg_ratelimited("nexthop == NULL\n"); 878 goto tx_error; 879 } 880 881 addr6 = (const struct in6_addr *)&neigh->primary_key; 882 addr_type = ipv6_addr_type(addr6); 883 884 if (addr_type == IPV6_ADDR_ANY) { 885 addr6 = &ipv6_hdr(skb)->daddr; 886 addr_type = ipv6_addr_type(addr6); 887 } 888 889 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 890 dst = addr6->s6_addr32[3]; 891 else 892 do_tx_error = true; 893 894 neigh_release(neigh); 895 if (do_tx_error) 896 goto tx_error; 897 } 898 899 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 900 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, 901 0, dst, tiph->saddr, 0, 0, 902 sock_net_uid(tunnel->net, NULL)); 903 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 904 905 if (IS_ERR(rt)) { 906 dev->stats.tx_carrier_errors++; 907 goto tx_error_icmp; 908 } 909 if (rt->rt_type != RTN_UNICAST) { 910 ip_rt_put(rt); 911 dev->stats.tx_carrier_errors++; 912 goto tx_error_icmp; 913 } 914 tdev = rt->dst.dev; 915 916 if (tdev == dev) { 917 ip_rt_put(rt); 918 dev->stats.collisions++; 919 goto tx_error; 920 } 921 922 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 923 ip_rt_put(rt); 924 goto tx_error; 925 } 926 927 if (df) { 928 mtu = dst_mtu(&rt->dst) - t_hlen; 929 930 if (mtu < 68) { 931 dev->stats.collisions++; 932 ip_rt_put(rt); 933 goto tx_error; 934 } 935 936 if (mtu < IPV6_MIN_MTU) { 937 mtu = IPV6_MIN_MTU; 938 df = 0; 939 } 940 941 if (tunnel->parms.iph.daddr) 942 skb_dst_update_pmtu(skb, mtu); 943 944 if (skb->len > mtu && !skb_is_gso(skb)) { 945 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 946 ip_rt_put(rt); 947 goto tx_error; 948 } 949 } 950 951 if (tunnel->err_count > 0) { 952 if (time_before(jiffies, 953 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 954 tunnel->err_count--; 955 dst_link_failure(skb); 956 } else 957 tunnel->err_count = 0; 958 } 959 960 /* 961 * Okay, now see if we can stuff it in the buffer as-is. 962 */ 963 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 964 965 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 966 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 967 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 968 if (!new_skb) { 969 ip_rt_put(rt); 970 dev->stats.tx_dropped++; 971 kfree_skb(skb); 972 return NETDEV_TX_OK; 973 } 974 if (skb->sk) 975 skb_set_owner_w(new_skb, skb->sk); 976 dev_kfree_skb(skb); 977 skb = new_skb; 978 iph6 = ipv6_hdr(skb); 979 } 980 ttl = tiph->ttl; 981 if (ttl == 0) 982 ttl = iph6->hop_limit; 983 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 984 985 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { 986 ip_rt_put(rt); 987 goto tx_error; 988 } 989 990 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 991 992 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 993 df, !net_eq(tunnel->net, dev_net(dev))); 994 return NETDEV_TX_OK; 995 996 tx_error_icmp: 997 dst_link_failure(skb); 998 tx_error: 999 kfree_skb(skb); 1000 dev->stats.tx_errors++; 1001 return NETDEV_TX_OK; 1002 } 1003 1004 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1005 struct net_device *dev, u8 ipproto) 1006 { 1007 struct ip_tunnel *tunnel = netdev_priv(dev); 1008 const struct iphdr *tiph = &tunnel->parms.iph; 1009 1010 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1011 goto tx_error; 1012 1013 skb_set_inner_ipproto(skb, ipproto); 1014 1015 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1016 return NETDEV_TX_OK; 1017 tx_error: 1018 kfree_skb(skb); 1019 dev->stats.tx_errors++; 1020 return NETDEV_TX_OK; 1021 } 1022 1023 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1024 struct net_device *dev) 1025 { 1026 if (!pskb_inet_may_pull(skb)) 1027 goto tx_err; 1028 1029 switch (skb->protocol) { 1030 case htons(ETH_P_IP): 1031 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1032 break; 1033 case htons(ETH_P_IPV6): 1034 ipip6_tunnel_xmit(skb, dev); 1035 break; 1036 #if IS_ENABLED(CONFIG_MPLS) 1037 case htons(ETH_P_MPLS_UC): 1038 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1039 break; 1040 #endif 1041 default: 1042 goto tx_err; 1043 } 1044 1045 return NETDEV_TX_OK; 1046 1047 tx_err: 1048 dev->stats.tx_errors++; 1049 kfree_skb(skb); 1050 return NETDEV_TX_OK; 1051 1052 } 1053 1054 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1055 { 1056 struct net_device *tdev = NULL; 1057 struct ip_tunnel *tunnel; 1058 const struct iphdr *iph; 1059 struct flowi4 fl4; 1060 1061 tunnel = netdev_priv(dev); 1062 iph = &tunnel->parms.iph; 1063 1064 if (iph->daddr) { 1065 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1066 NULL, 1067 iph->daddr, iph->saddr, 1068 0, 0, 1069 IPPROTO_IPV6, 1070 RT_TOS(iph->tos), 1071 tunnel->parms.link); 1072 1073 if (!IS_ERR(rt)) { 1074 tdev = rt->dst.dev; 1075 ip_rt_put(rt); 1076 } 1077 dev->flags |= IFF_POINTOPOINT; 1078 } 1079 1080 if (!tdev && tunnel->parms.link) 1081 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1082 1083 if (tdev && !netif_is_l3_master(tdev)) { 1084 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1085 1086 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); 1087 dev->mtu = tdev->mtu - t_hlen; 1088 if (dev->mtu < IPV6_MIN_MTU) 1089 dev->mtu = IPV6_MIN_MTU; 1090 } 1091 } 1092 1093 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, 1094 __u32 fwmark) 1095 { 1096 struct net *net = t->net; 1097 struct sit_net *sitn = net_generic(net, sit_net_id); 1098 1099 ipip6_tunnel_unlink(sitn, t); 1100 synchronize_net(); 1101 t->parms.iph.saddr = p->iph.saddr; 1102 t->parms.iph.daddr = p->iph.daddr; 1103 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 1104 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1105 ipip6_tunnel_link(sitn, t); 1106 t->parms.iph.ttl = p->iph.ttl; 1107 t->parms.iph.tos = p->iph.tos; 1108 t->parms.iph.frag_off = p->iph.frag_off; 1109 if (t->parms.link != p->link || t->fwmark != fwmark) { 1110 t->parms.link = p->link; 1111 t->fwmark = fwmark; 1112 ipip6_tunnel_bind_dev(t->dev); 1113 } 1114 dst_cache_reset(&t->dst_cache); 1115 netdev_state_change(t->dev); 1116 } 1117 1118 #ifdef CONFIG_IPV6_SIT_6RD 1119 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1120 struct ip_tunnel_6rd *ip6rd) 1121 { 1122 struct in6_addr prefix; 1123 __be32 relay_prefix; 1124 1125 if (ip6rd->relay_prefixlen > 32 || 1126 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1127 return -EINVAL; 1128 1129 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1130 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1131 return -EINVAL; 1132 if (ip6rd->relay_prefixlen) 1133 relay_prefix = ip6rd->relay_prefix & 1134 htonl(0xffffffffUL << 1135 (32 - ip6rd->relay_prefixlen)); 1136 else 1137 relay_prefix = 0; 1138 if (relay_prefix != ip6rd->relay_prefix) 1139 return -EINVAL; 1140 1141 t->ip6rd.prefix = prefix; 1142 t->ip6rd.relay_prefix = relay_prefix; 1143 t->ip6rd.prefixlen = ip6rd->prefixlen; 1144 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1145 dst_cache_reset(&t->dst_cache); 1146 netdev_state_change(t->dev); 1147 return 0; 1148 } 1149 #endif 1150 1151 static bool ipip6_valid_ip_proto(u8 ipproto) 1152 { 1153 return ipproto == IPPROTO_IPV6 || 1154 ipproto == IPPROTO_IPIP || 1155 #if IS_ENABLED(CONFIG_MPLS) 1156 ipproto == IPPROTO_MPLS || 1157 #endif 1158 ipproto == 0; 1159 } 1160 1161 static int 1162 ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1163 { 1164 int err = 0; 1165 struct ip_tunnel_parm p; 1166 struct ip_tunnel_prl prl; 1167 struct ip_tunnel *t = netdev_priv(dev); 1168 struct net *net = t->net; 1169 struct sit_net *sitn = net_generic(net, sit_net_id); 1170 #ifdef CONFIG_IPV6_SIT_6RD 1171 struct ip_tunnel_6rd ip6rd; 1172 #endif 1173 1174 switch (cmd) { 1175 case SIOCGETTUNNEL: 1176 #ifdef CONFIG_IPV6_SIT_6RD 1177 case SIOCGET6RD: 1178 #endif 1179 if (dev == sitn->fb_tunnel_dev) { 1180 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1181 err = -EFAULT; 1182 break; 1183 } 1184 t = ipip6_tunnel_locate(net, &p, 0); 1185 if (!t) 1186 t = netdev_priv(dev); 1187 } 1188 1189 err = -EFAULT; 1190 if (cmd == SIOCGETTUNNEL) { 1191 memcpy(&p, &t->parms, sizeof(p)); 1192 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, 1193 sizeof(p))) 1194 goto done; 1195 #ifdef CONFIG_IPV6_SIT_6RD 1196 } else { 1197 ip6rd.prefix = t->ip6rd.prefix; 1198 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1199 ip6rd.prefixlen = t->ip6rd.prefixlen; 1200 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1201 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, 1202 sizeof(ip6rd))) 1203 goto done; 1204 #endif 1205 } 1206 err = 0; 1207 break; 1208 1209 case SIOCADDTUNNEL: 1210 case SIOCCHGTUNNEL: 1211 err = -EPERM; 1212 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1213 goto done; 1214 1215 err = -EFAULT; 1216 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1217 goto done; 1218 1219 err = -EINVAL; 1220 if (!ipip6_valid_ip_proto(p.iph.protocol)) 1221 goto done; 1222 if (p.iph.version != 4 || 1223 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) 1224 goto done; 1225 if (p.iph.ttl) 1226 p.iph.frag_off |= htons(IP_DF); 1227 1228 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); 1229 1230 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1231 if (t) { 1232 if (t->dev != dev) { 1233 err = -EEXIST; 1234 break; 1235 } 1236 } else { 1237 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || 1238 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { 1239 err = -EINVAL; 1240 break; 1241 } 1242 t = netdev_priv(dev); 1243 } 1244 1245 ipip6_tunnel_update(t, &p, t->fwmark); 1246 } 1247 1248 if (t) { 1249 err = 0; 1250 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) 1251 err = -EFAULT; 1252 } else 1253 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1254 break; 1255 1256 case SIOCDELTUNNEL: 1257 err = -EPERM; 1258 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1259 goto done; 1260 1261 if (dev == sitn->fb_tunnel_dev) { 1262 err = -EFAULT; 1263 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1264 goto done; 1265 err = -ENOENT; 1266 t = ipip6_tunnel_locate(net, &p, 0); 1267 if (!t) 1268 goto done; 1269 err = -EPERM; 1270 if (t == netdev_priv(sitn->fb_tunnel_dev)) 1271 goto done; 1272 dev = t->dev; 1273 } 1274 unregister_netdevice(dev); 1275 err = 0; 1276 break; 1277 1278 case SIOCGETPRL: 1279 err = -EINVAL; 1280 if (dev == sitn->fb_tunnel_dev) 1281 goto done; 1282 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); 1283 break; 1284 1285 case SIOCADDPRL: 1286 case SIOCDELPRL: 1287 case SIOCCHGPRL: 1288 err = -EPERM; 1289 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1290 goto done; 1291 err = -EINVAL; 1292 if (dev == sitn->fb_tunnel_dev) 1293 goto done; 1294 err = -EFAULT; 1295 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) 1296 goto done; 1297 1298 switch (cmd) { 1299 case SIOCDELPRL: 1300 err = ipip6_tunnel_del_prl(t, &prl); 1301 break; 1302 case SIOCADDPRL: 1303 case SIOCCHGPRL: 1304 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 1305 break; 1306 } 1307 dst_cache_reset(&t->dst_cache); 1308 netdev_state_change(dev); 1309 break; 1310 1311 #ifdef CONFIG_IPV6_SIT_6RD 1312 case SIOCADD6RD: 1313 case SIOCCHG6RD: 1314 case SIOCDEL6RD: 1315 err = -EPERM; 1316 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1317 goto done; 1318 1319 err = -EFAULT; 1320 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, 1321 sizeof(ip6rd))) 1322 goto done; 1323 1324 if (cmd != SIOCDEL6RD) { 1325 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1326 if (err < 0) 1327 goto done; 1328 } else 1329 ipip6_tunnel_clone_6rd(dev, sitn); 1330 1331 err = 0; 1332 break; 1333 #endif 1334 1335 default: 1336 err = -EINVAL; 1337 } 1338 1339 done: 1340 return err; 1341 } 1342 1343 static const struct net_device_ops ipip6_netdev_ops = { 1344 .ndo_init = ipip6_tunnel_init, 1345 .ndo_uninit = ipip6_tunnel_uninit, 1346 .ndo_start_xmit = sit_tunnel_xmit, 1347 .ndo_do_ioctl = ipip6_tunnel_ioctl, 1348 .ndo_get_stats64 = ip_tunnel_get_stats64, 1349 .ndo_get_iflink = ip_tunnel_get_iflink, 1350 }; 1351 1352 static void ipip6_dev_free(struct net_device *dev) 1353 { 1354 struct ip_tunnel *tunnel = netdev_priv(dev); 1355 1356 dst_cache_destroy(&tunnel->dst_cache); 1357 free_percpu(dev->tstats); 1358 } 1359 1360 #define SIT_FEATURES (NETIF_F_SG | \ 1361 NETIF_F_FRAGLIST | \ 1362 NETIF_F_HIGHDMA | \ 1363 NETIF_F_GSO_SOFTWARE | \ 1364 NETIF_F_HW_CSUM) 1365 1366 static void ipip6_tunnel_setup(struct net_device *dev) 1367 { 1368 struct ip_tunnel *tunnel = netdev_priv(dev); 1369 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1370 1371 dev->netdev_ops = &ipip6_netdev_ops; 1372 dev->needs_free_netdev = true; 1373 dev->priv_destructor = ipip6_dev_free; 1374 1375 dev->type = ARPHRD_SIT; 1376 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1377 dev->mtu = ETH_DATA_LEN - t_hlen; 1378 dev->min_mtu = IPV6_MIN_MTU; 1379 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1380 dev->flags = IFF_NOARP; 1381 netif_keep_dst(dev); 1382 dev->addr_len = 4; 1383 dev->features |= NETIF_F_LLTX; 1384 dev->features |= SIT_FEATURES; 1385 dev->hw_features |= SIT_FEATURES; 1386 } 1387 1388 static int ipip6_tunnel_init(struct net_device *dev) 1389 { 1390 struct ip_tunnel *tunnel = netdev_priv(dev); 1391 int err; 1392 1393 tunnel->dev = dev; 1394 tunnel->net = dev_net(dev); 1395 strcpy(tunnel->parms.name, dev->name); 1396 1397 ipip6_tunnel_bind_dev(dev); 1398 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1399 if (!dev->tstats) 1400 return -ENOMEM; 1401 1402 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1403 if (err) { 1404 free_percpu(dev->tstats); 1405 dev->tstats = NULL; 1406 return err; 1407 } 1408 1409 return 0; 1410 } 1411 1412 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1413 { 1414 struct ip_tunnel *tunnel = netdev_priv(dev); 1415 struct iphdr *iph = &tunnel->parms.iph; 1416 struct net *net = dev_net(dev); 1417 struct sit_net *sitn = net_generic(net, sit_net_id); 1418 1419 iph->version = 4; 1420 iph->protocol = IPPROTO_IPV6; 1421 iph->ihl = 5; 1422 iph->ttl = 64; 1423 1424 dev_hold(dev); 1425 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1426 } 1427 1428 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1429 struct netlink_ext_ack *extack) 1430 { 1431 u8 proto; 1432 1433 if (!data || !data[IFLA_IPTUN_PROTO]) 1434 return 0; 1435 1436 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1437 if (!ipip6_valid_ip_proto(proto)) 1438 return -EINVAL; 1439 1440 return 0; 1441 } 1442 1443 static void ipip6_netlink_parms(struct nlattr *data[], 1444 struct ip_tunnel_parm *parms, 1445 __u32 *fwmark) 1446 { 1447 memset(parms, 0, sizeof(*parms)); 1448 1449 parms->iph.version = 4; 1450 parms->iph.protocol = IPPROTO_IPV6; 1451 parms->iph.ihl = 5; 1452 parms->iph.ttl = 64; 1453 1454 if (!data) 1455 return; 1456 1457 if (data[IFLA_IPTUN_LINK]) 1458 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1459 1460 if (data[IFLA_IPTUN_LOCAL]) 1461 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1462 1463 if (data[IFLA_IPTUN_REMOTE]) 1464 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1465 1466 if (data[IFLA_IPTUN_TTL]) { 1467 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1468 if (parms->iph.ttl) 1469 parms->iph.frag_off = htons(IP_DF); 1470 } 1471 1472 if (data[IFLA_IPTUN_TOS]) 1473 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1474 1475 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1476 parms->iph.frag_off = htons(IP_DF); 1477 1478 if (data[IFLA_IPTUN_FLAGS]) 1479 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1480 1481 if (data[IFLA_IPTUN_PROTO]) 1482 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1483 1484 if (data[IFLA_IPTUN_FWMARK]) 1485 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1486 } 1487 1488 /* This function returns true when ENCAP attributes are present in the nl msg */ 1489 static bool ipip6_netlink_encap_parms(struct nlattr *data[], 1490 struct ip_tunnel_encap *ipencap) 1491 { 1492 bool ret = false; 1493 1494 memset(ipencap, 0, sizeof(*ipencap)); 1495 1496 if (!data) 1497 return ret; 1498 1499 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1500 ret = true; 1501 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1502 } 1503 1504 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1505 ret = true; 1506 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1507 } 1508 1509 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1510 ret = true; 1511 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1512 } 1513 1514 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1515 ret = true; 1516 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1517 } 1518 1519 return ret; 1520 } 1521 1522 #ifdef CONFIG_IPV6_SIT_6RD 1523 /* This function returns true when 6RD attributes are present in the nl msg */ 1524 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1525 struct ip_tunnel_6rd *ip6rd) 1526 { 1527 bool ret = false; 1528 memset(ip6rd, 0, sizeof(*ip6rd)); 1529 1530 if (!data) 1531 return ret; 1532 1533 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1534 ret = true; 1535 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1536 } 1537 1538 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1539 ret = true; 1540 ip6rd->relay_prefix = 1541 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1542 } 1543 1544 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1545 ret = true; 1546 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1547 } 1548 1549 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1550 ret = true; 1551 ip6rd->relay_prefixlen = 1552 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1553 } 1554 1555 return ret; 1556 } 1557 #endif 1558 1559 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1560 struct nlattr *tb[], struct nlattr *data[], 1561 struct netlink_ext_ack *extack) 1562 { 1563 struct net *net = dev_net(dev); 1564 struct ip_tunnel *nt; 1565 struct ip_tunnel_encap ipencap; 1566 #ifdef CONFIG_IPV6_SIT_6RD 1567 struct ip_tunnel_6rd ip6rd; 1568 #endif 1569 int err; 1570 1571 nt = netdev_priv(dev); 1572 1573 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1574 err = ip_tunnel_encap_setup(nt, &ipencap); 1575 if (err < 0) 1576 return err; 1577 } 1578 1579 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1580 1581 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1582 return -EEXIST; 1583 1584 err = ipip6_tunnel_create(dev); 1585 if (err < 0) 1586 return err; 1587 1588 if (tb[IFLA_MTU]) { 1589 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1590 1591 if (mtu >= IPV6_MIN_MTU && 1592 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1593 dev->mtu = mtu; 1594 } 1595 1596 #ifdef CONFIG_IPV6_SIT_6RD 1597 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1598 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1599 #endif 1600 1601 return err; 1602 } 1603 1604 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1605 struct nlattr *data[], 1606 struct netlink_ext_ack *extack) 1607 { 1608 struct ip_tunnel *t = netdev_priv(dev); 1609 struct ip_tunnel_parm p; 1610 struct ip_tunnel_encap ipencap; 1611 struct net *net = t->net; 1612 struct sit_net *sitn = net_generic(net, sit_net_id); 1613 #ifdef CONFIG_IPV6_SIT_6RD 1614 struct ip_tunnel_6rd ip6rd; 1615 #endif 1616 __u32 fwmark = t->fwmark; 1617 int err; 1618 1619 if (dev == sitn->fb_tunnel_dev) 1620 return -EINVAL; 1621 1622 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1623 err = ip_tunnel_encap_setup(t, &ipencap); 1624 if (err < 0) 1625 return err; 1626 } 1627 1628 ipip6_netlink_parms(data, &p, &fwmark); 1629 1630 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1631 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1632 return -EINVAL; 1633 1634 t = ipip6_tunnel_locate(net, &p, 0); 1635 1636 if (t) { 1637 if (t->dev != dev) 1638 return -EEXIST; 1639 } else 1640 t = netdev_priv(dev); 1641 1642 ipip6_tunnel_update(t, &p, fwmark); 1643 1644 #ifdef CONFIG_IPV6_SIT_6RD 1645 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1646 return ipip6_tunnel_update_6rd(t, &ip6rd); 1647 #endif 1648 1649 return 0; 1650 } 1651 1652 static size_t ipip6_get_size(const struct net_device *dev) 1653 { 1654 return 1655 /* IFLA_IPTUN_LINK */ 1656 nla_total_size(4) + 1657 /* IFLA_IPTUN_LOCAL */ 1658 nla_total_size(4) + 1659 /* IFLA_IPTUN_REMOTE */ 1660 nla_total_size(4) + 1661 /* IFLA_IPTUN_TTL */ 1662 nla_total_size(1) + 1663 /* IFLA_IPTUN_TOS */ 1664 nla_total_size(1) + 1665 /* IFLA_IPTUN_PMTUDISC */ 1666 nla_total_size(1) + 1667 /* IFLA_IPTUN_FLAGS */ 1668 nla_total_size(2) + 1669 /* IFLA_IPTUN_PROTO */ 1670 nla_total_size(1) + 1671 #ifdef CONFIG_IPV6_SIT_6RD 1672 /* IFLA_IPTUN_6RD_PREFIX */ 1673 nla_total_size(sizeof(struct in6_addr)) + 1674 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1675 nla_total_size(4) + 1676 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1677 nla_total_size(2) + 1678 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1679 nla_total_size(2) + 1680 #endif 1681 /* IFLA_IPTUN_ENCAP_TYPE */ 1682 nla_total_size(2) + 1683 /* IFLA_IPTUN_ENCAP_FLAGS */ 1684 nla_total_size(2) + 1685 /* IFLA_IPTUN_ENCAP_SPORT */ 1686 nla_total_size(2) + 1687 /* IFLA_IPTUN_ENCAP_DPORT */ 1688 nla_total_size(2) + 1689 /* IFLA_IPTUN_FWMARK */ 1690 nla_total_size(4) + 1691 0; 1692 } 1693 1694 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1695 { 1696 struct ip_tunnel *tunnel = netdev_priv(dev); 1697 struct ip_tunnel_parm *parm = &tunnel->parms; 1698 1699 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1700 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1701 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1702 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1703 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1704 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1705 !!(parm->iph.frag_off & htons(IP_DF))) || 1706 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1707 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || 1708 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1709 goto nla_put_failure; 1710 1711 #ifdef CONFIG_IPV6_SIT_6RD 1712 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1713 &tunnel->ip6rd.prefix) || 1714 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1715 tunnel->ip6rd.relay_prefix) || 1716 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1717 tunnel->ip6rd.prefixlen) || 1718 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1719 tunnel->ip6rd.relay_prefixlen)) 1720 goto nla_put_failure; 1721 #endif 1722 1723 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1724 tunnel->encap.type) || 1725 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1726 tunnel->encap.sport) || 1727 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1728 tunnel->encap.dport) || 1729 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1730 tunnel->encap.flags)) 1731 goto nla_put_failure; 1732 1733 return 0; 1734 1735 nla_put_failure: 1736 return -EMSGSIZE; 1737 } 1738 1739 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1740 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1741 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1742 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1743 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1744 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1745 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1746 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1747 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1748 #ifdef CONFIG_IPV6_SIT_6RD 1749 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1750 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1751 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1752 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1753 #endif 1754 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1755 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1756 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1757 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1758 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1759 }; 1760 1761 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1762 { 1763 struct net *net = dev_net(dev); 1764 struct sit_net *sitn = net_generic(net, sit_net_id); 1765 1766 if (dev != sitn->fb_tunnel_dev) 1767 unregister_netdevice_queue(dev, head); 1768 } 1769 1770 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1771 .kind = "sit", 1772 .maxtype = IFLA_IPTUN_MAX, 1773 .policy = ipip6_policy, 1774 .priv_size = sizeof(struct ip_tunnel), 1775 .setup = ipip6_tunnel_setup, 1776 .validate = ipip6_validate, 1777 .newlink = ipip6_newlink, 1778 .changelink = ipip6_changelink, 1779 .get_size = ipip6_get_size, 1780 .fill_info = ipip6_fill_info, 1781 .dellink = ipip6_dellink, 1782 .get_link_net = ip_tunnel_get_link_net, 1783 }; 1784 1785 static struct xfrm_tunnel sit_handler __read_mostly = { 1786 .handler = ipip6_rcv, 1787 .err_handler = ipip6_err, 1788 .priority = 1, 1789 }; 1790 1791 static struct xfrm_tunnel ipip_handler __read_mostly = { 1792 .handler = ipip_rcv, 1793 .err_handler = ipip6_err, 1794 .priority = 2, 1795 }; 1796 1797 #if IS_ENABLED(CONFIG_MPLS) 1798 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1799 .handler = mplsip_rcv, 1800 .err_handler = ipip6_err, 1801 .priority = 2, 1802 }; 1803 #endif 1804 1805 static void __net_exit sit_destroy_tunnels(struct net *net, 1806 struct list_head *head) 1807 { 1808 struct sit_net *sitn = net_generic(net, sit_net_id); 1809 struct net_device *dev, *aux; 1810 int prio; 1811 1812 for_each_netdev_safe(net, dev, aux) 1813 if (dev->rtnl_link_ops == &sit_link_ops) 1814 unregister_netdevice_queue(dev, head); 1815 1816 for (prio = 1; prio < 4; prio++) { 1817 int h; 1818 for (h = 0; h < IP6_SIT_HASH_SIZE; h++) { 1819 struct ip_tunnel *t; 1820 1821 t = rtnl_dereference(sitn->tunnels[prio][h]); 1822 while (t) { 1823 /* If dev is in the same netns, it has already 1824 * been added to the list by the previous loop. 1825 */ 1826 if (!net_eq(dev_net(t->dev), net)) 1827 unregister_netdevice_queue(t->dev, 1828 head); 1829 t = rtnl_dereference(t->next); 1830 } 1831 } 1832 } 1833 } 1834 1835 static int __net_init sit_init_net(struct net *net) 1836 { 1837 struct sit_net *sitn = net_generic(net, sit_net_id); 1838 struct ip_tunnel *t; 1839 int err; 1840 1841 sitn->tunnels[0] = sitn->tunnels_wc; 1842 sitn->tunnels[1] = sitn->tunnels_l; 1843 sitn->tunnels[2] = sitn->tunnels_r; 1844 sitn->tunnels[3] = sitn->tunnels_r_l; 1845 1846 if (!net_has_fallback_tunnels(net)) 1847 return 0; 1848 1849 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1850 NET_NAME_UNKNOWN, 1851 ipip6_tunnel_setup); 1852 if (!sitn->fb_tunnel_dev) { 1853 err = -ENOMEM; 1854 goto err_alloc_dev; 1855 } 1856 dev_net_set(sitn->fb_tunnel_dev, net); 1857 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1858 /* FB netdevice is special: we have one, and only one per netns. 1859 * Allowing to move it to another netns is clearly unsafe. 1860 */ 1861 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1862 1863 err = register_netdev(sitn->fb_tunnel_dev); 1864 if (err) 1865 goto err_reg_dev; 1866 1867 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1868 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1869 1870 t = netdev_priv(sitn->fb_tunnel_dev); 1871 1872 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1873 return 0; 1874 1875 err_reg_dev: 1876 ipip6_dev_free(sitn->fb_tunnel_dev); 1877 free_netdev(sitn->fb_tunnel_dev); 1878 err_alloc_dev: 1879 return err; 1880 } 1881 1882 static void __net_exit sit_exit_batch_net(struct list_head *net_list) 1883 { 1884 LIST_HEAD(list); 1885 struct net *net; 1886 1887 rtnl_lock(); 1888 list_for_each_entry(net, net_list, exit_list) 1889 sit_destroy_tunnels(net, &list); 1890 1891 unregister_netdevice_many(&list); 1892 rtnl_unlock(); 1893 } 1894 1895 static struct pernet_operations sit_net_ops = { 1896 .init = sit_init_net, 1897 .exit_batch = sit_exit_batch_net, 1898 .id = &sit_net_id, 1899 .size = sizeof(struct sit_net), 1900 }; 1901 1902 static void __exit sit_cleanup(void) 1903 { 1904 rtnl_link_unregister(&sit_link_ops); 1905 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1906 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1907 #if IS_ENABLED(CONFIG_MPLS) 1908 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1909 #endif 1910 1911 unregister_pernet_device(&sit_net_ops); 1912 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1913 } 1914 1915 static int __init sit_init(void) 1916 { 1917 int err; 1918 1919 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1920 1921 err = register_pernet_device(&sit_net_ops); 1922 if (err < 0) 1923 return err; 1924 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1925 if (err < 0) { 1926 pr_info("%s: can't register ip6ip4\n", __func__); 1927 goto xfrm_tunnel_failed; 1928 } 1929 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1930 if (err < 0) { 1931 pr_info("%s: can't register ip4ip4\n", __func__); 1932 goto xfrm_tunnel4_failed; 1933 } 1934 #if IS_ENABLED(CONFIG_MPLS) 1935 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1936 if (err < 0) { 1937 pr_info("%s: can't register mplsip\n", __func__); 1938 goto xfrm_tunnel_mpls_failed; 1939 } 1940 #endif 1941 err = rtnl_link_register(&sit_link_ops); 1942 if (err < 0) 1943 goto rtnl_link_failed; 1944 1945 out: 1946 return err; 1947 1948 rtnl_link_failed: 1949 #if IS_ENABLED(CONFIG_MPLS) 1950 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1951 xfrm_tunnel_mpls_failed: 1952 #endif 1953 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1954 xfrm_tunnel4_failed: 1955 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1956 xfrm_tunnel_failed: 1957 unregister_pernet_device(&sit_net_ops); 1958 goto out; 1959 } 1960 1961 module_init(sit_init); 1962 module_exit(sit_cleanup); 1963 MODULE_LICENSE("GPL"); 1964 MODULE_ALIAS_RTNL_LINK("sit"); 1965 MODULE_ALIAS_NETDEV("sit0"); 1966