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)); 903 904 rt = dst_cache_get_ip4(&tunnel->dst_cache, &fl4.saddr); 905 if (!rt) { 906 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 907 if (IS_ERR(rt)) { 908 dev->stats.tx_carrier_errors++; 909 goto tx_error_icmp; 910 } 911 dst_cache_set_ip4(&tunnel->dst_cache, &rt->dst, fl4.saddr); 912 } 913 914 if (rt->rt_type != RTN_UNICAST) { 915 ip_rt_put(rt); 916 dev->stats.tx_carrier_errors++; 917 goto tx_error_icmp; 918 } 919 tdev = rt->dst.dev; 920 921 if (tdev == dev) { 922 ip_rt_put(rt); 923 dev->stats.collisions++; 924 goto tx_error; 925 } 926 927 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 928 ip_rt_put(rt); 929 goto tx_error; 930 } 931 932 if (df) { 933 mtu = dst_mtu(&rt->dst) - t_hlen; 934 935 if (mtu < 68) { 936 dev->stats.collisions++; 937 ip_rt_put(rt); 938 goto tx_error; 939 } 940 941 if (mtu < IPV6_MIN_MTU) { 942 mtu = IPV6_MIN_MTU; 943 df = 0; 944 } 945 946 if (tunnel->parms.iph.daddr) 947 skb_dst_update_pmtu(skb, mtu); 948 949 if (skb->len > mtu && !skb_is_gso(skb)) { 950 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 951 ip_rt_put(rt); 952 goto tx_error; 953 } 954 } 955 956 if (tunnel->err_count > 0) { 957 if (time_before(jiffies, 958 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 959 tunnel->err_count--; 960 dst_link_failure(skb); 961 } else 962 tunnel->err_count = 0; 963 } 964 965 /* 966 * Okay, now see if we can stuff it in the buffer as-is. 967 */ 968 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 969 970 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 971 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 972 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 973 if (!new_skb) { 974 ip_rt_put(rt); 975 dev->stats.tx_dropped++; 976 kfree_skb(skb); 977 return NETDEV_TX_OK; 978 } 979 if (skb->sk) 980 skb_set_owner_w(new_skb, skb->sk); 981 dev_kfree_skb(skb); 982 skb = new_skb; 983 iph6 = ipv6_hdr(skb); 984 } 985 ttl = tiph->ttl; 986 if (ttl == 0) 987 ttl = iph6->hop_limit; 988 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 989 990 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { 991 ip_rt_put(rt); 992 goto tx_error; 993 } 994 995 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 996 997 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 998 df, !net_eq(tunnel->net, dev_net(dev))); 999 return NETDEV_TX_OK; 1000 1001 tx_error_icmp: 1002 dst_link_failure(skb); 1003 tx_error: 1004 kfree_skb(skb); 1005 dev->stats.tx_errors++; 1006 return NETDEV_TX_OK; 1007 } 1008 1009 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1010 struct net_device *dev, u8 ipproto) 1011 { 1012 struct ip_tunnel *tunnel = netdev_priv(dev); 1013 const struct iphdr *tiph = &tunnel->parms.iph; 1014 1015 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1016 goto tx_error; 1017 1018 skb_set_inner_ipproto(skb, ipproto); 1019 1020 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1021 return NETDEV_TX_OK; 1022 tx_error: 1023 kfree_skb(skb); 1024 dev->stats.tx_errors++; 1025 return NETDEV_TX_OK; 1026 } 1027 1028 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1029 struct net_device *dev) 1030 { 1031 if (!pskb_inet_may_pull(skb)) 1032 goto tx_err; 1033 1034 switch (skb->protocol) { 1035 case htons(ETH_P_IP): 1036 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1037 break; 1038 case htons(ETH_P_IPV6): 1039 ipip6_tunnel_xmit(skb, dev); 1040 break; 1041 #if IS_ENABLED(CONFIG_MPLS) 1042 case htons(ETH_P_MPLS_UC): 1043 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1044 break; 1045 #endif 1046 default: 1047 goto tx_err; 1048 } 1049 1050 return NETDEV_TX_OK; 1051 1052 tx_err: 1053 dev->stats.tx_errors++; 1054 kfree_skb(skb); 1055 return NETDEV_TX_OK; 1056 1057 } 1058 1059 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1060 { 1061 struct net_device *tdev = NULL; 1062 struct ip_tunnel *tunnel; 1063 const struct iphdr *iph; 1064 struct flowi4 fl4; 1065 1066 tunnel = netdev_priv(dev); 1067 iph = &tunnel->parms.iph; 1068 1069 if (iph->daddr) { 1070 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1071 NULL, 1072 iph->daddr, iph->saddr, 1073 0, 0, 1074 IPPROTO_IPV6, 1075 RT_TOS(iph->tos), 1076 tunnel->parms.link); 1077 1078 if (!IS_ERR(rt)) { 1079 tdev = rt->dst.dev; 1080 ip_rt_put(rt); 1081 } 1082 dev->flags |= IFF_POINTOPOINT; 1083 } 1084 1085 if (!tdev && tunnel->parms.link) 1086 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1087 1088 if (tdev && !netif_is_l3_master(tdev)) { 1089 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1090 1091 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); 1092 dev->mtu = tdev->mtu - t_hlen; 1093 if (dev->mtu < IPV6_MIN_MTU) 1094 dev->mtu = IPV6_MIN_MTU; 1095 } 1096 } 1097 1098 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, 1099 __u32 fwmark) 1100 { 1101 struct net *net = t->net; 1102 struct sit_net *sitn = net_generic(net, sit_net_id); 1103 1104 ipip6_tunnel_unlink(sitn, t); 1105 synchronize_net(); 1106 t->parms.iph.saddr = p->iph.saddr; 1107 t->parms.iph.daddr = p->iph.daddr; 1108 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 1109 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1110 ipip6_tunnel_link(sitn, t); 1111 t->parms.iph.ttl = p->iph.ttl; 1112 t->parms.iph.tos = p->iph.tos; 1113 t->parms.iph.frag_off = p->iph.frag_off; 1114 if (t->parms.link != p->link || t->fwmark != fwmark) { 1115 t->parms.link = p->link; 1116 t->fwmark = fwmark; 1117 ipip6_tunnel_bind_dev(t->dev); 1118 } 1119 dst_cache_reset(&t->dst_cache); 1120 netdev_state_change(t->dev); 1121 } 1122 1123 #ifdef CONFIG_IPV6_SIT_6RD 1124 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1125 struct ip_tunnel_6rd *ip6rd) 1126 { 1127 struct in6_addr prefix; 1128 __be32 relay_prefix; 1129 1130 if (ip6rd->relay_prefixlen > 32 || 1131 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1132 return -EINVAL; 1133 1134 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1135 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1136 return -EINVAL; 1137 if (ip6rd->relay_prefixlen) 1138 relay_prefix = ip6rd->relay_prefix & 1139 htonl(0xffffffffUL << 1140 (32 - ip6rd->relay_prefixlen)); 1141 else 1142 relay_prefix = 0; 1143 if (relay_prefix != ip6rd->relay_prefix) 1144 return -EINVAL; 1145 1146 t->ip6rd.prefix = prefix; 1147 t->ip6rd.relay_prefix = relay_prefix; 1148 t->ip6rd.prefixlen = ip6rd->prefixlen; 1149 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1150 dst_cache_reset(&t->dst_cache); 1151 netdev_state_change(t->dev); 1152 return 0; 1153 } 1154 #endif 1155 1156 static bool ipip6_valid_ip_proto(u8 ipproto) 1157 { 1158 return ipproto == IPPROTO_IPV6 || 1159 ipproto == IPPROTO_IPIP || 1160 #if IS_ENABLED(CONFIG_MPLS) 1161 ipproto == IPPROTO_MPLS || 1162 #endif 1163 ipproto == 0; 1164 } 1165 1166 static int 1167 ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1168 { 1169 int err = 0; 1170 struct ip_tunnel_parm p; 1171 struct ip_tunnel_prl prl; 1172 struct ip_tunnel *t = netdev_priv(dev); 1173 struct net *net = t->net; 1174 struct sit_net *sitn = net_generic(net, sit_net_id); 1175 #ifdef CONFIG_IPV6_SIT_6RD 1176 struct ip_tunnel_6rd ip6rd; 1177 #endif 1178 1179 switch (cmd) { 1180 case SIOCGETTUNNEL: 1181 #ifdef CONFIG_IPV6_SIT_6RD 1182 case SIOCGET6RD: 1183 #endif 1184 if (dev == sitn->fb_tunnel_dev) { 1185 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1186 err = -EFAULT; 1187 break; 1188 } 1189 t = ipip6_tunnel_locate(net, &p, 0); 1190 if (!t) 1191 t = netdev_priv(dev); 1192 } 1193 1194 err = -EFAULT; 1195 if (cmd == SIOCGETTUNNEL) { 1196 memcpy(&p, &t->parms, sizeof(p)); 1197 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, 1198 sizeof(p))) 1199 goto done; 1200 #ifdef CONFIG_IPV6_SIT_6RD 1201 } else { 1202 ip6rd.prefix = t->ip6rd.prefix; 1203 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1204 ip6rd.prefixlen = t->ip6rd.prefixlen; 1205 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1206 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, 1207 sizeof(ip6rd))) 1208 goto done; 1209 #endif 1210 } 1211 err = 0; 1212 break; 1213 1214 case SIOCADDTUNNEL: 1215 case SIOCCHGTUNNEL: 1216 err = -EPERM; 1217 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1218 goto done; 1219 1220 err = -EFAULT; 1221 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1222 goto done; 1223 1224 err = -EINVAL; 1225 if (!ipip6_valid_ip_proto(p.iph.protocol)) 1226 goto done; 1227 if (p.iph.version != 4 || 1228 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) 1229 goto done; 1230 if (p.iph.ttl) 1231 p.iph.frag_off |= htons(IP_DF); 1232 1233 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); 1234 1235 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1236 if (t) { 1237 if (t->dev != dev) { 1238 err = -EEXIST; 1239 break; 1240 } 1241 } else { 1242 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || 1243 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { 1244 err = -EINVAL; 1245 break; 1246 } 1247 t = netdev_priv(dev); 1248 } 1249 1250 ipip6_tunnel_update(t, &p, t->fwmark); 1251 } 1252 1253 if (t) { 1254 err = 0; 1255 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) 1256 err = -EFAULT; 1257 } else 1258 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1259 break; 1260 1261 case SIOCDELTUNNEL: 1262 err = -EPERM; 1263 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1264 goto done; 1265 1266 if (dev == sitn->fb_tunnel_dev) { 1267 err = -EFAULT; 1268 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1269 goto done; 1270 err = -ENOENT; 1271 t = ipip6_tunnel_locate(net, &p, 0); 1272 if (!t) 1273 goto done; 1274 err = -EPERM; 1275 if (t == netdev_priv(sitn->fb_tunnel_dev)) 1276 goto done; 1277 dev = t->dev; 1278 } 1279 unregister_netdevice(dev); 1280 err = 0; 1281 break; 1282 1283 case SIOCGETPRL: 1284 err = -EINVAL; 1285 if (dev == sitn->fb_tunnel_dev) 1286 goto done; 1287 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); 1288 break; 1289 1290 case SIOCADDPRL: 1291 case SIOCDELPRL: 1292 case SIOCCHGPRL: 1293 err = -EPERM; 1294 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1295 goto done; 1296 err = -EINVAL; 1297 if (dev == sitn->fb_tunnel_dev) 1298 goto done; 1299 err = -EFAULT; 1300 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) 1301 goto done; 1302 1303 switch (cmd) { 1304 case SIOCDELPRL: 1305 err = ipip6_tunnel_del_prl(t, &prl); 1306 break; 1307 case SIOCADDPRL: 1308 case SIOCCHGPRL: 1309 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 1310 break; 1311 } 1312 dst_cache_reset(&t->dst_cache); 1313 netdev_state_change(dev); 1314 break; 1315 1316 #ifdef CONFIG_IPV6_SIT_6RD 1317 case SIOCADD6RD: 1318 case SIOCCHG6RD: 1319 case SIOCDEL6RD: 1320 err = -EPERM; 1321 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1322 goto done; 1323 1324 err = -EFAULT; 1325 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, 1326 sizeof(ip6rd))) 1327 goto done; 1328 1329 if (cmd != SIOCDEL6RD) { 1330 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1331 if (err < 0) 1332 goto done; 1333 } else 1334 ipip6_tunnel_clone_6rd(dev, sitn); 1335 1336 err = 0; 1337 break; 1338 #endif 1339 1340 default: 1341 err = -EINVAL; 1342 } 1343 1344 done: 1345 return err; 1346 } 1347 1348 static const struct net_device_ops ipip6_netdev_ops = { 1349 .ndo_init = ipip6_tunnel_init, 1350 .ndo_uninit = ipip6_tunnel_uninit, 1351 .ndo_start_xmit = sit_tunnel_xmit, 1352 .ndo_do_ioctl = ipip6_tunnel_ioctl, 1353 .ndo_get_stats64 = ip_tunnel_get_stats64, 1354 .ndo_get_iflink = ip_tunnel_get_iflink, 1355 }; 1356 1357 static void ipip6_dev_free(struct net_device *dev) 1358 { 1359 struct ip_tunnel *tunnel = netdev_priv(dev); 1360 1361 dst_cache_destroy(&tunnel->dst_cache); 1362 free_percpu(dev->tstats); 1363 } 1364 1365 #define SIT_FEATURES (NETIF_F_SG | \ 1366 NETIF_F_FRAGLIST | \ 1367 NETIF_F_HIGHDMA | \ 1368 NETIF_F_GSO_SOFTWARE | \ 1369 NETIF_F_HW_CSUM) 1370 1371 static void ipip6_tunnel_setup(struct net_device *dev) 1372 { 1373 struct ip_tunnel *tunnel = netdev_priv(dev); 1374 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1375 1376 dev->netdev_ops = &ipip6_netdev_ops; 1377 dev->needs_free_netdev = true; 1378 dev->priv_destructor = ipip6_dev_free; 1379 1380 dev->type = ARPHRD_SIT; 1381 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1382 dev->mtu = ETH_DATA_LEN - t_hlen; 1383 dev->min_mtu = IPV6_MIN_MTU; 1384 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1385 dev->flags = IFF_NOARP; 1386 netif_keep_dst(dev); 1387 dev->addr_len = 4; 1388 dev->features |= NETIF_F_LLTX; 1389 dev->features |= SIT_FEATURES; 1390 dev->hw_features |= SIT_FEATURES; 1391 } 1392 1393 static int ipip6_tunnel_init(struct net_device *dev) 1394 { 1395 struct ip_tunnel *tunnel = netdev_priv(dev); 1396 int err; 1397 1398 tunnel->dev = dev; 1399 tunnel->net = dev_net(dev); 1400 strcpy(tunnel->parms.name, dev->name); 1401 1402 ipip6_tunnel_bind_dev(dev); 1403 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1404 if (!dev->tstats) 1405 return -ENOMEM; 1406 1407 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1408 if (err) { 1409 free_percpu(dev->tstats); 1410 dev->tstats = NULL; 1411 return err; 1412 } 1413 1414 return 0; 1415 } 1416 1417 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1418 { 1419 struct ip_tunnel *tunnel = netdev_priv(dev); 1420 struct iphdr *iph = &tunnel->parms.iph; 1421 struct net *net = dev_net(dev); 1422 struct sit_net *sitn = net_generic(net, sit_net_id); 1423 1424 iph->version = 4; 1425 iph->protocol = IPPROTO_IPV6; 1426 iph->ihl = 5; 1427 iph->ttl = 64; 1428 1429 dev_hold(dev); 1430 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1431 } 1432 1433 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1434 struct netlink_ext_ack *extack) 1435 { 1436 u8 proto; 1437 1438 if (!data || !data[IFLA_IPTUN_PROTO]) 1439 return 0; 1440 1441 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1442 if (!ipip6_valid_ip_proto(proto)) 1443 return -EINVAL; 1444 1445 return 0; 1446 } 1447 1448 static void ipip6_netlink_parms(struct nlattr *data[], 1449 struct ip_tunnel_parm *parms, 1450 __u32 *fwmark) 1451 { 1452 memset(parms, 0, sizeof(*parms)); 1453 1454 parms->iph.version = 4; 1455 parms->iph.protocol = IPPROTO_IPV6; 1456 parms->iph.ihl = 5; 1457 parms->iph.ttl = 64; 1458 1459 if (!data) 1460 return; 1461 1462 if (data[IFLA_IPTUN_LINK]) 1463 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1464 1465 if (data[IFLA_IPTUN_LOCAL]) 1466 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1467 1468 if (data[IFLA_IPTUN_REMOTE]) 1469 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1470 1471 if (data[IFLA_IPTUN_TTL]) { 1472 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1473 if (parms->iph.ttl) 1474 parms->iph.frag_off = htons(IP_DF); 1475 } 1476 1477 if (data[IFLA_IPTUN_TOS]) 1478 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1479 1480 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1481 parms->iph.frag_off = htons(IP_DF); 1482 1483 if (data[IFLA_IPTUN_FLAGS]) 1484 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1485 1486 if (data[IFLA_IPTUN_PROTO]) 1487 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1488 1489 if (data[IFLA_IPTUN_FWMARK]) 1490 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1491 } 1492 1493 /* This function returns true when ENCAP attributes are present in the nl msg */ 1494 static bool ipip6_netlink_encap_parms(struct nlattr *data[], 1495 struct ip_tunnel_encap *ipencap) 1496 { 1497 bool ret = false; 1498 1499 memset(ipencap, 0, sizeof(*ipencap)); 1500 1501 if (!data) 1502 return ret; 1503 1504 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1505 ret = true; 1506 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1507 } 1508 1509 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1510 ret = true; 1511 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1512 } 1513 1514 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1515 ret = true; 1516 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1517 } 1518 1519 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1520 ret = true; 1521 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1522 } 1523 1524 return ret; 1525 } 1526 1527 #ifdef CONFIG_IPV6_SIT_6RD 1528 /* This function returns true when 6RD attributes are present in the nl msg */ 1529 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1530 struct ip_tunnel_6rd *ip6rd) 1531 { 1532 bool ret = false; 1533 memset(ip6rd, 0, sizeof(*ip6rd)); 1534 1535 if (!data) 1536 return ret; 1537 1538 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1539 ret = true; 1540 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1541 } 1542 1543 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1544 ret = true; 1545 ip6rd->relay_prefix = 1546 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1547 } 1548 1549 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1550 ret = true; 1551 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1552 } 1553 1554 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1555 ret = true; 1556 ip6rd->relay_prefixlen = 1557 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1558 } 1559 1560 return ret; 1561 } 1562 #endif 1563 1564 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1565 struct nlattr *tb[], struct nlattr *data[], 1566 struct netlink_ext_ack *extack) 1567 { 1568 struct net *net = dev_net(dev); 1569 struct ip_tunnel *nt; 1570 struct ip_tunnel_encap ipencap; 1571 #ifdef CONFIG_IPV6_SIT_6RD 1572 struct ip_tunnel_6rd ip6rd; 1573 #endif 1574 int err; 1575 1576 nt = netdev_priv(dev); 1577 1578 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1579 err = ip_tunnel_encap_setup(nt, &ipencap); 1580 if (err < 0) 1581 return err; 1582 } 1583 1584 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1585 1586 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1587 return -EEXIST; 1588 1589 err = ipip6_tunnel_create(dev); 1590 if (err < 0) 1591 return err; 1592 1593 if (tb[IFLA_MTU]) { 1594 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1595 1596 if (mtu >= IPV6_MIN_MTU && 1597 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1598 dev->mtu = mtu; 1599 } 1600 1601 #ifdef CONFIG_IPV6_SIT_6RD 1602 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1603 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1604 #endif 1605 1606 return err; 1607 } 1608 1609 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1610 struct nlattr *data[], 1611 struct netlink_ext_ack *extack) 1612 { 1613 struct ip_tunnel *t = netdev_priv(dev); 1614 struct ip_tunnel_parm p; 1615 struct ip_tunnel_encap ipencap; 1616 struct net *net = t->net; 1617 struct sit_net *sitn = net_generic(net, sit_net_id); 1618 #ifdef CONFIG_IPV6_SIT_6RD 1619 struct ip_tunnel_6rd ip6rd; 1620 #endif 1621 __u32 fwmark = t->fwmark; 1622 int err; 1623 1624 if (dev == sitn->fb_tunnel_dev) 1625 return -EINVAL; 1626 1627 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1628 err = ip_tunnel_encap_setup(t, &ipencap); 1629 if (err < 0) 1630 return err; 1631 } 1632 1633 ipip6_netlink_parms(data, &p, &fwmark); 1634 1635 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1636 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1637 return -EINVAL; 1638 1639 t = ipip6_tunnel_locate(net, &p, 0); 1640 1641 if (t) { 1642 if (t->dev != dev) 1643 return -EEXIST; 1644 } else 1645 t = netdev_priv(dev); 1646 1647 ipip6_tunnel_update(t, &p, fwmark); 1648 1649 #ifdef CONFIG_IPV6_SIT_6RD 1650 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1651 return ipip6_tunnel_update_6rd(t, &ip6rd); 1652 #endif 1653 1654 return 0; 1655 } 1656 1657 static size_t ipip6_get_size(const struct net_device *dev) 1658 { 1659 return 1660 /* IFLA_IPTUN_LINK */ 1661 nla_total_size(4) + 1662 /* IFLA_IPTUN_LOCAL */ 1663 nla_total_size(4) + 1664 /* IFLA_IPTUN_REMOTE */ 1665 nla_total_size(4) + 1666 /* IFLA_IPTUN_TTL */ 1667 nla_total_size(1) + 1668 /* IFLA_IPTUN_TOS */ 1669 nla_total_size(1) + 1670 /* IFLA_IPTUN_PMTUDISC */ 1671 nla_total_size(1) + 1672 /* IFLA_IPTUN_FLAGS */ 1673 nla_total_size(2) + 1674 /* IFLA_IPTUN_PROTO */ 1675 nla_total_size(1) + 1676 #ifdef CONFIG_IPV6_SIT_6RD 1677 /* IFLA_IPTUN_6RD_PREFIX */ 1678 nla_total_size(sizeof(struct in6_addr)) + 1679 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1680 nla_total_size(4) + 1681 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1682 nla_total_size(2) + 1683 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1684 nla_total_size(2) + 1685 #endif 1686 /* IFLA_IPTUN_ENCAP_TYPE */ 1687 nla_total_size(2) + 1688 /* IFLA_IPTUN_ENCAP_FLAGS */ 1689 nla_total_size(2) + 1690 /* IFLA_IPTUN_ENCAP_SPORT */ 1691 nla_total_size(2) + 1692 /* IFLA_IPTUN_ENCAP_DPORT */ 1693 nla_total_size(2) + 1694 /* IFLA_IPTUN_FWMARK */ 1695 nla_total_size(4) + 1696 0; 1697 } 1698 1699 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1700 { 1701 struct ip_tunnel *tunnel = netdev_priv(dev); 1702 struct ip_tunnel_parm *parm = &tunnel->parms; 1703 1704 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1705 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1706 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1707 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1708 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1709 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1710 !!(parm->iph.frag_off & htons(IP_DF))) || 1711 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1712 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || 1713 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1714 goto nla_put_failure; 1715 1716 #ifdef CONFIG_IPV6_SIT_6RD 1717 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1718 &tunnel->ip6rd.prefix) || 1719 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1720 tunnel->ip6rd.relay_prefix) || 1721 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1722 tunnel->ip6rd.prefixlen) || 1723 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1724 tunnel->ip6rd.relay_prefixlen)) 1725 goto nla_put_failure; 1726 #endif 1727 1728 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1729 tunnel->encap.type) || 1730 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1731 tunnel->encap.sport) || 1732 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1733 tunnel->encap.dport) || 1734 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1735 tunnel->encap.flags)) 1736 goto nla_put_failure; 1737 1738 return 0; 1739 1740 nla_put_failure: 1741 return -EMSGSIZE; 1742 } 1743 1744 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1745 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1746 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1747 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1748 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1749 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1750 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1751 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1752 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1753 #ifdef CONFIG_IPV6_SIT_6RD 1754 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1755 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1756 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1757 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1758 #endif 1759 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1760 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1761 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1762 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1763 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1764 }; 1765 1766 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1767 { 1768 struct net *net = dev_net(dev); 1769 struct sit_net *sitn = net_generic(net, sit_net_id); 1770 1771 if (dev != sitn->fb_tunnel_dev) 1772 unregister_netdevice_queue(dev, head); 1773 } 1774 1775 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1776 .kind = "sit", 1777 .maxtype = IFLA_IPTUN_MAX, 1778 .policy = ipip6_policy, 1779 .priv_size = sizeof(struct ip_tunnel), 1780 .setup = ipip6_tunnel_setup, 1781 .validate = ipip6_validate, 1782 .newlink = ipip6_newlink, 1783 .changelink = ipip6_changelink, 1784 .get_size = ipip6_get_size, 1785 .fill_info = ipip6_fill_info, 1786 .dellink = ipip6_dellink, 1787 .get_link_net = ip_tunnel_get_link_net, 1788 }; 1789 1790 static struct xfrm_tunnel sit_handler __read_mostly = { 1791 .handler = ipip6_rcv, 1792 .err_handler = ipip6_err, 1793 .priority = 1, 1794 }; 1795 1796 static struct xfrm_tunnel ipip_handler __read_mostly = { 1797 .handler = ipip_rcv, 1798 .err_handler = ipip6_err, 1799 .priority = 2, 1800 }; 1801 1802 #if IS_ENABLED(CONFIG_MPLS) 1803 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1804 .handler = mplsip_rcv, 1805 .err_handler = ipip6_err, 1806 .priority = 2, 1807 }; 1808 #endif 1809 1810 static void __net_exit sit_destroy_tunnels(struct net *net, 1811 struct list_head *head) 1812 { 1813 struct sit_net *sitn = net_generic(net, sit_net_id); 1814 struct net_device *dev, *aux; 1815 int prio; 1816 1817 for_each_netdev_safe(net, dev, aux) 1818 if (dev->rtnl_link_ops == &sit_link_ops) 1819 unregister_netdevice_queue(dev, head); 1820 1821 for (prio = 1; prio < 4; prio++) { 1822 int h; 1823 for (h = 0; h < IP6_SIT_HASH_SIZE; h++) { 1824 struct ip_tunnel *t; 1825 1826 t = rtnl_dereference(sitn->tunnels[prio][h]); 1827 while (t) { 1828 /* If dev is in the same netns, it has already 1829 * been added to the list by the previous loop. 1830 */ 1831 if (!net_eq(dev_net(t->dev), net)) 1832 unregister_netdevice_queue(t->dev, 1833 head); 1834 t = rtnl_dereference(t->next); 1835 } 1836 } 1837 } 1838 } 1839 1840 static int __net_init sit_init_net(struct net *net) 1841 { 1842 struct sit_net *sitn = net_generic(net, sit_net_id); 1843 struct ip_tunnel *t; 1844 int err; 1845 1846 sitn->tunnels[0] = sitn->tunnels_wc; 1847 sitn->tunnels[1] = sitn->tunnels_l; 1848 sitn->tunnels[2] = sitn->tunnels_r; 1849 sitn->tunnels[3] = sitn->tunnels_r_l; 1850 1851 if (!net_has_fallback_tunnels(net)) 1852 return 0; 1853 1854 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1855 NET_NAME_UNKNOWN, 1856 ipip6_tunnel_setup); 1857 if (!sitn->fb_tunnel_dev) { 1858 err = -ENOMEM; 1859 goto err_alloc_dev; 1860 } 1861 dev_net_set(sitn->fb_tunnel_dev, net); 1862 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1863 /* FB netdevice is special: we have one, and only one per netns. 1864 * Allowing to move it to another netns is clearly unsafe. 1865 */ 1866 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1867 1868 err = register_netdev(sitn->fb_tunnel_dev); 1869 if (err) 1870 goto err_reg_dev; 1871 1872 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1873 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1874 1875 t = netdev_priv(sitn->fb_tunnel_dev); 1876 1877 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1878 return 0; 1879 1880 err_reg_dev: 1881 ipip6_dev_free(sitn->fb_tunnel_dev); 1882 free_netdev(sitn->fb_tunnel_dev); 1883 err_alloc_dev: 1884 return err; 1885 } 1886 1887 static void __net_exit sit_exit_batch_net(struct list_head *net_list) 1888 { 1889 LIST_HEAD(list); 1890 struct net *net; 1891 1892 rtnl_lock(); 1893 list_for_each_entry(net, net_list, exit_list) 1894 sit_destroy_tunnels(net, &list); 1895 1896 unregister_netdevice_many(&list); 1897 rtnl_unlock(); 1898 } 1899 1900 static struct pernet_operations sit_net_ops = { 1901 .init = sit_init_net, 1902 .exit_batch = sit_exit_batch_net, 1903 .id = &sit_net_id, 1904 .size = sizeof(struct sit_net), 1905 }; 1906 1907 static void __exit sit_cleanup(void) 1908 { 1909 rtnl_link_unregister(&sit_link_ops); 1910 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1911 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1912 #if IS_ENABLED(CONFIG_MPLS) 1913 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1914 #endif 1915 1916 unregister_pernet_device(&sit_net_ops); 1917 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1918 } 1919 1920 static int __init sit_init(void) 1921 { 1922 int err; 1923 1924 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1925 1926 err = register_pernet_device(&sit_net_ops); 1927 if (err < 0) 1928 return err; 1929 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1930 if (err < 0) { 1931 pr_info("%s: can't register ip6ip4\n", __func__); 1932 goto xfrm_tunnel_failed; 1933 } 1934 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1935 if (err < 0) { 1936 pr_info("%s: can't register ip4ip4\n", __func__); 1937 goto xfrm_tunnel4_failed; 1938 } 1939 #if IS_ENABLED(CONFIG_MPLS) 1940 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1941 if (err < 0) { 1942 pr_info("%s: can't register mplsip\n", __func__); 1943 goto xfrm_tunnel_mpls_failed; 1944 } 1945 #endif 1946 err = rtnl_link_register(&sit_link_ops); 1947 if (err < 0) 1948 goto rtnl_link_failed; 1949 1950 out: 1951 return err; 1952 1953 rtnl_link_failed: 1954 #if IS_ENABLED(CONFIG_MPLS) 1955 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1956 xfrm_tunnel_mpls_failed: 1957 #endif 1958 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1959 xfrm_tunnel4_failed: 1960 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1961 xfrm_tunnel_failed: 1962 unregister_pernet_device(&sit_net_ops); 1963 goto out; 1964 } 1965 1966 module_init(sit_init); 1967 module_exit(sit_cleanup); 1968 MODULE_LICENSE("GPL"); 1969 MODULE_ALIAS_RTNL_LINK("sit"); 1970 MODULE_ALIAS_NETDEV("sit0"); 1971