1 /* 2 * IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT) 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 * 14 * Changes: 15 * Roger Venning <r.venning@telstra.com>: 6to4 support 16 * Nate Thompson <nate@thebog.net>: 6to4 support 17 * Fred Templin <fred.l.templin@boeing.com>: isatap support 18 */ 19 20 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22 #include <linux/module.h> 23 #include <linux/capability.h> 24 #include <linux/errno.h> 25 #include <linux/types.h> 26 #include <linux/socket.h> 27 #include <linux/sockios.h> 28 #include <linux/net.h> 29 #include <linux/in6.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_arp.h> 32 #include <linux/icmp.h> 33 #include <linux/slab.h> 34 #include <linux/uaccess.h> 35 #include <linux/init.h> 36 #include <linux/netfilter_ipv4.h> 37 #include <linux/if_ether.h> 38 39 #include <net/sock.h> 40 #include <net/snmp.h> 41 42 #include <net/ipv6.h> 43 #include <net/protocol.h> 44 #include <net/transp_v6.h> 45 #include <net/ip6_fib.h> 46 #include <net/ip6_route.h> 47 #include <net/ndisc.h> 48 #include <net/addrconf.h> 49 #include <net/ip.h> 50 #include <net/udp.h> 51 #include <net/icmp.h> 52 #include <net/ip_tunnels.h> 53 #include <net/inet_ecn.h> 54 #include <net/xfrm.h> 55 #include <net/dsfield.h> 56 #include <net/net_namespace.h> 57 #include <net/netns/generic.h> 58 59 /* 60 This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c 61 62 For comments look at net/ipv4/ip_gre.c --ANK 63 */ 64 65 #define IP6_SIT_HASH_SIZE 16 66 #define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF) 67 68 static bool log_ecn_error = true; 69 module_param(log_ecn_error, bool, 0644); 70 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 71 72 static int ipip6_tunnel_init(struct net_device *dev); 73 static void ipip6_tunnel_setup(struct net_device *dev); 74 static void ipip6_dev_free(struct net_device *dev); 75 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 76 __be32 *v4dst); 77 static struct rtnl_link_ops sit_link_ops __read_mostly; 78 79 static unsigned int sit_net_id __read_mostly; 80 struct sit_net { 81 struct ip_tunnel __rcu *tunnels_r_l[IP6_SIT_HASH_SIZE]; 82 struct ip_tunnel __rcu *tunnels_r[IP6_SIT_HASH_SIZE]; 83 struct ip_tunnel __rcu *tunnels_l[IP6_SIT_HASH_SIZE]; 84 struct ip_tunnel __rcu *tunnels_wc[1]; 85 struct ip_tunnel __rcu **tunnels[4]; 86 87 struct net_device *fb_tunnel_dev; 88 }; 89 90 /* 91 * Must be invoked with rcu_read_lock 92 */ 93 static struct ip_tunnel *ipip6_tunnel_lookup(struct net *net, 94 struct net_device *dev, 95 __be32 remote, __be32 local, 96 int sifindex) 97 { 98 unsigned int h0 = HASH(remote); 99 unsigned int h1 = HASH(local); 100 struct ip_tunnel *t; 101 struct sit_net *sitn = net_generic(net, sit_net_id); 102 int ifindex = dev ? dev->ifindex : 0; 103 104 for_each_ip_tunnel_rcu(t, sitn->tunnels_r_l[h0 ^ h1]) { 105 if (local == t->parms.iph.saddr && 106 remote == t->parms.iph.daddr && 107 (!dev || !t->parms.link || ifindex == t->parms.link || 108 sifindex == t->parms.link) && 109 (t->dev->flags & IFF_UP)) 110 return t; 111 } 112 for_each_ip_tunnel_rcu(t, sitn->tunnels_r[h0]) { 113 if (remote == t->parms.iph.daddr && 114 (!dev || !t->parms.link || ifindex == t->parms.link || 115 sifindex == t->parms.link) && 116 (t->dev->flags & IFF_UP)) 117 return t; 118 } 119 for_each_ip_tunnel_rcu(t, sitn->tunnels_l[h1]) { 120 if (local == t->parms.iph.saddr && 121 (!dev || !t->parms.link || ifindex == t->parms.link || 122 sifindex == t->parms.link) && 123 (t->dev->flags & IFF_UP)) 124 return t; 125 } 126 t = rcu_dereference(sitn->tunnels_wc[0]); 127 if (t && (t->dev->flags & IFF_UP)) 128 return t; 129 return NULL; 130 } 131 132 static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn, 133 struct ip_tunnel_parm *parms) 134 { 135 __be32 remote = parms->iph.daddr; 136 __be32 local = parms->iph.saddr; 137 unsigned int h = 0; 138 int prio = 0; 139 140 if (remote) { 141 prio |= 2; 142 h ^= HASH(remote); 143 } 144 if (local) { 145 prio |= 1; 146 h ^= HASH(local); 147 } 148 return &sitn->tunnels[prio][h]; 149 } 150 151 static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn, 152 struct ip_tunnel *t) 153 { 154 return __ipip6_bucket(sitn, &t->parms); 155 } 156 157 static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t) 158 { 159 struct ip_tunnel __rcu **tp; 160 struct ip_tunnel *iter; 161 162 for (tp = ipip6_bucket(sitn, t); 163 (iter = rtnl_dereference(*tp)) != NULL; 164 tp = &iter->next) { 165 if (t == iter) { 166 rcu_assign_pointer(*tp, t->next); 167 break; 168 } 169 } 170 } 171 172 static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t) 173 { 174 struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t); 175 176 rcu_assign_pointer(t->next, rtnl_dereference(*tp)); 177 rcu_assign_pointer(*tp, t); 178 } 179 180 static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn) 181 { 182 #ifdef CONFIG_IPV6_SIT_6RD 183 struct ip_tunnel *t = netdev_priv(dev); 184 185 if (dev == sitn->fb_tunnel_dev || !sitn->fb_tunnel_dev) { 186 ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0); 187 t->ip6rd.relay_prefix = 0; 188 t->ip6rd.prefixlen = 16; 189 t->ip6rd.relay_prefixlen = 0; 190 } else { 191 struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev); 192 memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd)); 193 } 194 #endif 195 } 196 197 static int ipip6_tunnel_create(struct net_device *dev) 198 { 199 struct ip_tunnel *t = netdev_priv(dev); 200 struct net *net = dev_net(dev); 201 struct sit_net *sitn = net_generic(net, sit_net_id); 202 int err; 203 204 memcpy(dev->dev_addr, &t->parms.iph.saddr, 4); 205 memcpy(dev->broadcast, &t->parms.iph.daddr, 4); 206 207 if ((__force u16)t->parms.i_flags & SIT_ISATAP) 208 dev->priv_flags |= IFF_ISATAP; 209 210 dev->rtnl_link_ops = &sit_link_ops; 211 212 err = register_netdevice(dev); 213 if (err < 0) 214 goto out; 215 216 ipip6_tunnel_clone_6rd(dev, sitn); 217 218 dev_hold(dev); 219 220 ipip6_tunnel_link(sitn, t); 221 return 0; 222 223 out: 224 return err; 225 } 226 227 static struct ip_tunnel *ipip6_tunnel_locate(struct net *net, 228 struct ip_tunnel_parm *parms, int create) 229 { 230 __be32 remote = parms->iph.daddr; 231 __be32 local = parms->iph.saddr; 232 struct ip_tunnel *t, *nt; 233 struct ip_tunnel __rcu **tp; 234 struct net_device *dev; 235 char name[IFNAMSIZ]; 236 struct sit_net *sitn = net_generic(net, sit_net_id); 237 238 for (tp = __ipip6_bucket(sitn, parms); 239 (t = rtnl_dereference(*tp)) != NULL; 240 tp = &t->next) { 241 if (local == t->parms.iph.saddr && 242 remote == t->parms.iph.daddr && 243 parms->link == t->parms.link) { 244 if (create) 245 return NULL; 246 else 247 return t; 248 } 249 } 250 if (!create) 251 goto failed; 252 253 if (parms->name[0]) { 254 if (!dev_valid_name(parms->name)) 255 goto failed; 256 strlcpy(name, parms->name, IFNAMSIZ); 257 } else { 258 strcpy(name, "sit%d"); 259 } 260 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 261 ipip6_tunnel_setup); 262 if (!dev) 263 return NULL; 264 265 dev_net_set(dev, net); 266 267 nt = netdev_priv(dev); 268 269 nt->parms = *parms; 270 if (ipip6_tunnel_create(dev) < 0) 271 goto failed_free; 272 273 return nt; 274 275 failed_free: 276 free_netdev(dev); 277 failed: 278 return NULL; 279 } 280 281 #define for_each_prl_rcu(start) \ 282 for (prl = rcu_dereference(start); \ 283 prl; \ 284 prl = rcu_dereference(prl->next)) 285 286 static struct ip_tunnel_prl_entry * 287 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr) 288 { 289 struct ip_tunnel_prl_entry *prl; 290 291 for_each_prl_rcu(t->prl) 292 if (prl->addr == addr) 293 break; 294 return prl; 295 296 } 297 298 static int ipip6_tunnel_get_prl(struct ip_tunnel *t, 299 struct ip_tunnel_prl __user *a) 300 { 301 struct ip_tunnel_prl kprl, *kp; 302 struct ip_tunnel_prl_entry *prl; 303 unsigned int cmax, c = 0, ca, len; 304 int ret = 0; 305 306 if (copy_from_user(&kprl, a, sizeof(kprl))) 307 return -EFAULT; 308 cmax = kprl.datalen / sizeof(kprl); 309 if (cmax > 1 && kprl.addr != htonl(INADDR_ANY)) 310 cmax = 1; 311 312 /* For simple GET or for root users, 313 * we try harder to allocate. 314 */ 315 kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ? 316 kcalloc(cmax, sizeof(*kp), GFP_KERNEL | __GFP_NOWARN) : 317 NULL; 318 319 rcu_read_lock(); 320 321 ca = t->prl_count < cmax ? t->prl_count : cmax; 322 323 if (!kp) { 324 /* We don't try hard to allocate much memory for 325 * non-root users. 326 * For root users, retry allocating enough memory for 327 * the answer. 328 */ 329 kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC); 330 if (!kp) { 331 ret = -ENOMEM; 332 goto out; 333 } 334 } 335 336 c = 0; 337 for_each_prl_rcu(t->prl) { 338 if (c >= cmax) 339 break; 340 if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr) 341 continue; 342 kp[c].addr = prl->addr; 343 kp[c].flags = prl->flags; 344 c++; 345 if (kprl.addr != htonl(INADDR_ANY)) 346 break; 347 } 348 out: 349 rcu_read_unlock(); 350 351 len = sizeof(*kp) * c; 352 ret = 0; 353 if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen)) 354 ret = -EFAULT; 355 356 kfree(kp); 357 358 return ret; 359 } 360 361 static int 362 ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg) 363 { 364 struct ip_tunnel_prl_entry *p; 365 int err = 0; 366 367 if (a->addr == htonl(INADDR_ANY)) 368 return -EINVAL; 369 370 ASSERT_RTNL(); 371 372 for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) { 373 if (p->addr == a->addr) { 374 if (chg) { 375 p->flags = a->flags; 376 goto out; 377 } 378 err = -EEXIST; 379 goto out; 380 } 381 } 382 383 if (chg) { 384 err = -ENXIO; 385 goto out; 386 } 387 388 p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL); 389 if (!p) { 390 err = -ENOBUFS; 391 goto out; 392 } 393 394 p->next = t->prl; 395 p->addr = a->addr; 396 p->flags = a->flags; 397 t->prl_count++; 398 rcu_assign_pointer(t->prl, p); 399 out: 400 return err; 401 } 402 403 static void prl_list_destroy_rcu(struct rcu_head *head) 404 { 405 struct ip_tunnel_prl_entry *p, *n; 406 407 p = container_of(head, struct ip_tunnel_prl_entry, rcu_head); 408 do { 409 n = rcu_dereference_protected(p->next, 1); 410 kfree(p); 411 p = n; 412 } while (p); 413 } 414 415 static int 416 ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a) 417 { 418 struct ip_tunnel_prl_entry *x; 419 struct ip_tunnel_prl_entry __rcu **p; 420 int err = 0; 421 422 ASSERT_RTNL(); 423 424 if (a && a->addr != htonl(INADDR_ANY)) { 425 for (p = &t->prl; 426 (x = rtnl_dereference(*p)) != NULL; 427 p = &x->next) { 428 if (x->addr == a->addr) { 429 *p = x->next; 430 kfree_rcu(x, rcu_head); 431 t->prl_count--; 432 goto out; 433 } 434 } 435 err = -ENXIO; 436 } else { 437 x = rtnl_dereference(t->prl); 438 if (x) { 439 t->prl_count = 0; 440 call_rcu(&x->rcu_head, prl_list_destroy_rcu); 441 t->prl = NULL; 442 } 443 } 444 out: 445 return err; 446 } 447 448 static int 449 isatap_chksrc(struct sk_buff *skb, const struct iphdr *iph, struct ip_tunnel *t) 450 { 451 struct ip_tunnel_prl_entry *p; 452 int ok = 1; 453 454 rcu_read_lock(); 455 p = __ipip6_tunnel_locate_prl(t, iph->saddr); 456 if (p) { 457 if (p->flags & PRL_DEFAULT) 458 skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT; 459 else 460 skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT; 461 } else { 462 const struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr; 463 464 if (ipv6_addr_is_isatap(addr6) && 465 (addr6->s6_addr32[3] == iph->saddr) && 466 ipv6_chk_prefix(addr6, t->dev)) 467 skb->ndisc_nodetype = NDISC_NODETYPE_HOST; 468 else 469 ok = 0; 470 } 471 rcu_read_unlock(); 472 return ok; 473 } 474 475 static void ipip6_tunnel_uninit(struct net_device *dev) 476 { 477 struct ip_tunnel *tunnel = netdev_priv(dev); 478 struct sit_net *sitn = net_generic(tunnel->net, sit_net_id); 479 480 if (dev == sitn->fb_tunnel_dev) { 481 RCU_INIT_POINTER(sitn->tunnels_wc[0], NULL); 482 } else { 483 ipip6_tunnel_unlink(sitn, tunnel); 484 ipip6_tunnel_del_prl(tunnel, NULL); 485 } 486 dst_cache_reset(&tunnel->dst_cache); 487 dev_put(dev); 488 } 489 490 static int ipip6_err(struct sk_buff *skb, u32 info) 491 { 492 const struct iphdr *iph = (const struct iphdr *)skb->data; 493 const int type = icmp_hdr(skb)->type; 494 const int code = icmp_hdr(skb)->code; 495 unsigned int data_len = 0; 496 struct ip_tunnel *t; 497 int sifindex; 498 int err; 499 500 switch (type) { 501 default: 502 case ICMP_PARAMETERPROB: 503 return 0; 504 505 case ICMP_DEST_UNREACH: 506 switch (code) { 507 case ICMP_SR_FAILED: 508 /* Impossible event. */ 509 return 0; 510 default: 511 /* All others are translated to HOST_UNREACH. 512 rfc2003 contains "deep thoughts" about NET_UNREACH, 513 I believe they are just ether pollution. --ANK 514 */ 515 break; 516 } 517 break; 518 case ICMP_TIME_EXCEEDED: 519 if (code != ICMP_EXC_TTL) 520 return 0; 521 data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */ 522 break; 523 case ICMP_REDIRECT: 524 break; 525 } 526 527 err = -ENOENT; 528 529 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 530 t = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 531 iph->daddr, iph->saddr, sifindex); 532 if (!t) 533 goto out; 534 535 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { 536 ipv4_update_pmtu(skb, dev_net(skb->dev), info, 537 t->parms.link, iph->protocol); 538 err = 0; 539 goto out; 540 } 541 if (type == ICMP_REDIRECT) { 542 ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 543 iph->protocol); 544 err = 0; 545 goto out; 546 } 547 548 err = 0; 549 if (__in6_dev_get(skb->dev) && 550 !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4, type, data_len)) 551 goto out; 552 553 if (t->parms.iph.daddr == 0) 554 goto out; 555 556 if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) 557 goto out; 558 559 if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO)) 560 t->err_count++; 561 else 562 t->err_count = 1; 563 t->err_time = jiffies; 564 out: 565 return err; 566 } 567 568 static inline bool is_spoofed_6rd(struct ip_tunnel *tunnel, const __be32 v4addr, 569 const struct in6_addr *v6addr) 570 { 571 __be32 v4embed = 0; 572 if (check_6rd(tunnel, v6addr, &v4embed) && v4addr != v4embed) 573 return true; 574 return false; 575 } 576 577 /* Checks if an address matches an address on the tunnel interface. 578 * Used to detect the NAT of proto 41 packets and let them pass spoofing test. 579 * Long story: 580 * This function is called after we considered the packet as spoofed 581 * in is_spoofed_6rd. 582 * We may have a router that is doing NAT for proto 41 packets 583 * for an internal station. Destination a.a.a.a/PREFIX:bbbb:bbbb 584 * will be translated to n.n.n.n/PREFIX:bbbb:bbbb. And is_spoofed_6rd 585 * function will return true, dropping the packet. 586 * But, we can still check if is spoofed against the IP 587 * addresses associated with the interface. 588 */ 589 static bool only_dnatted(const struct ip_tunnel *tunnel, 590 const struct in6_addr *v6dst) 591 { 592 int prefix_len; 593 594 #ifdef CONFIG_IPV6_SIT_6RD 595 prefix_len = tunnel->ip6rd.prefixlen + 32 596 - tunnel->ip6rd.relay_prefixlen; 597 #else 598 prefix_len = 48; 599 #endif 600 return ipv6_chk_custom_prefix(v6dst, prefix_len, tunnel->dev); 601 } 602 603 /* Returns true if a packet is spoofed */ 604 static bool packet_is_spoofed(struct sk_buff *skb, 605 const struct iphdr *iph, 606 struct ip_tunnel *tunnel) 607 { 608 const struct ipv6hdr *ipv6h; 609 610 if (tunnel->dev->priv_flags & IFF_ISATAP) { 611 if (!isatap_chksrc(skb, iph, tunnel)) 612 return true; 613 614 return false; 615 } 616 617 if (tunnel->dev->flags & IFF_POINTOPOINT) 618 return false; 619 620 ipv6h = ipv6_hdr(skb); 621 622 if (unlikely(is_spoofed_6rd(tunnel, iph->saddr, &ipv6h->saddr))) { 623 net_warn_ratelimited("Src spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 624 &iph->saddr, &ipv6h->saddr, 625 &iph->daddr, &ipv6h->daddr); 626 return true; 627 } 628 629 if (likely(!is_spoofed_6rd(tunnel, iph->daddr, &ipv6h->daddr))) 630 return false; 631 632 if (only_dnatted(tunnel, &ipv6h->daddr)) 633 return false; 634 635 net_warn_ratelimited("Dst spoofed %pI4/%pI6c -> %pI4/%pI6c\n", 636 &iph->saddr, &ipv6h->saddr, 637 &iph->daddr, &ipv6h->daddr); 638 return true; 639 } 640 641 static int ipip6_rcv(struct sk_buff *skb) 642 { 643 const struct iphdr *iph = ip_hdr(skb); 644 struct ip_tunnel *tunnel; 645 int sifindex; 646 int err; 647 648 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 649 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 650 iph->saddr, iph->daddr, sifindex); 651 if (tunnel) { 652 struct pcpu_sw_netstats *tstats; 653 654 if (tunnel->parms.iph.protocol != IPPROTO_IPV6 && 655 tunnel->parms.iph.protocol != 0) 656 goto out; 657 658 skb->mac_header = skb->network_header; 659 skb_reset_network_header(skb); 660 IPCB(skb)->flags = 0; 661 skb->dev = tunnel->dev; 662 663 if (packet_is_spoofed(skb, iph, tunnel)) { 664 tunnel->dev->stats.rx_errors++; 665 goto out; 666 } 667 668 if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6), 669 !net_eq(tunnel->net, dev_net(tunnel->dev)))) 670 goto out; 671 672 /* skb can be uncloned in iptunnel_pull_header, so 673 * old iph is no longer valid 674 */ 675 iph = (const struct iphdr *)skb_mac_header(skb); 676 err = IP_ECN_decapsulate(iph, skb); 677 if (unlikely(err)) { 678 if (log_ecn_error) 679 net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n", 680 &iph->saddr, iph->tos); 681 if (err > 1) { 682 ++tunnel->dev->stats.rx_frame_errors; 683 ++tunnel->dev->stats.rx_errors; 684 goto out; 685 } 686 } 687 688 tstats = this_cpu_ptr(tunnel->dev->tstats); 689 u64_stats_update_begin(&tstats->syncp); 690 tstats->rx_packets++; 691 tstats->rx_bytes += skb->len; 692 u64_stats_update_end(&tstats->syncp); 693 694 netif_rx(skb); 695 696 return 0; 697 } 698 699 /* no tunnel matched, let upstream know, ipsec may handle it */ 700 return 1; 701 out: 702 kfree_skb(skb); 703 return 0; 704 } 705 706 static const struct tnl_ptk_info ipip_tpi = { 707 /* no tunnel info required for ipip. */ 708 .proto = htons(ETH_P_IP), 709 }; 710 711 #if IS_ENABLED(CONFIG_MPLS) 712 static const struct tnl_ptk_info mplsip_tpi = { 713 /* no tunnel info required for mplsip. */ 714 .proto = htons(ETH_P_MPLS_UC), 715 }; 716 #endif 717 718 static int sit_tunnel_rcv(struct sk_buff *skb, u8 ipproto) 719 { 720 const struct iphdr *iph; 721 struct ip_tunnel *tunnel; 722 int sifindex; 723 724 sifindex = netif_is_l3_master(skb->dev) ? IPCB(skb)->iif : 0; 725 726 iph = ip_hdr(skb); 727 tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev, 728 iph->saddr, iph->daddr, sifindex); 729 if (tunnel) { 730 const struct tnl_ptk_info *tpi; 731 732 if (tunnel->parms.iph.protocol != ipproto && 733 tunnel->parms.iph.protocol != 0) 734 goto drop; 735 736 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) 737 goto drop; 738 #if IS_ENABLED(CONFIG_MPLS) 739 if (ipproto == IPPROTO_MPLS) 740 tpi = &mplsip_tpi; 741 else 742 #endif 743 tpi = &ipip_tpi; 744 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 745 goto drop; 746 return ip_tunnel_rcv(tunnel, skb, tpi, NULL, log_ecn_error); 747 } 748 749 return 1; 750 751 drop: 752 kfree_skb(skb); 753 return 0; 754 } 755 756 static int ipip_rcv(struct sk_buff *skb) 757 { 758 return sit_tunnel_rcv(skb, IPPROTO_IPIP); 759 } 760 761 #if IS_ENABLED(CONFIG_MPLS) 762 static int mplsip_rcv(struct sk_buff *skb) 763 { 764 return sit_tunnel_rcv(skb, IPPROTO_MPLS); 765 } 766 #endif 767 768 /* 769 * If the IPv6 address comes from 6rd / 6to4 (RFC 3056) addr space this function 770 * stores the embedded IPv4 address in v4dst and returns true. 771 */ 772 static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, 773 __be32 *v4dst) 774 { 775 #ifdef CONFIG_IPV6_SIT_6RD 776 if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix, 777 tunnel->ip6rd.prefixlen)) { 778 unsigned int pbw0, pbi0; 779 int pbi1; 780 u32 d; 781 782 pbw0 = tunnel->ip6rd.prefixlen >> 5; 783 pbi0 = tunnel->ip6rd.prefixlen & 0x1f; 784 785 d = tunnel->ip6rd.relay_prefixlen < 32 ? 786 (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> 787 tunnel->ip6rd.relay_prefixlen : 0; 788 789 pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; 790 if (pbi1 > 0) 791 d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >> 792 (32 - pbi1); 793 794 *v4dst = tunnel->ip6rd.relay_prefix | htonl(d); 795 return true; 796 } 797 #else 798 if (v6dst->s6_addr16[0] == htons(0x2002)) { 799 /* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */ 800 memcpy(v4dst, &v6dst->s6_addr16[1], 4); 801 return true; 802 } 803 #endif 804 return false; 805 } 806 807 static inline __be32 try_6rd(struct ip_tunnel *tunnel, 808 const struct in6_addr *v6dst) 809 { 810 __be32 dst = 0; 811 check_6rd(tunnel, v6dst, &dst); 812 return dst; 813 } 814 815 /* 816 * This function assumes it is being called from dev_queue_xmit() 817 * and that skb is filled properly by that function. 818 */ 819 820 static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, 821 struct net_device *dev) 822 { 823 struct ip_tunnel *tunnel = netdev_priv(dev); 824 const struct iphdr *tiph = &tunnel->parms.iph; 825 const struct ipv6hdr *iph6 = ipv6_hdr(skb); 826 u8 tos = tunnel->parms.iph.tos; 827 __be16 df = tiph->frag_off; 828 struct rtable *rt; /* Route to the other host */ 829 struct net_device *tdev; /* Device to other host */ 830 unsigned int max_headroom; /* The extra header space needed */ 831 __be32 dst = tiph->daddr; 832 struct flowi4 fl4; 833 int mtu; 834 const struct in6_addr *addr6; 835 int addr_type; 836 u8 ttl; 837 u8 protocol = IPPROTO_IPV6; 838 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 839 840 if (tos == 1) 841 tos = ipv6_get_dsfield(iph6); 842 843 /* ISATAP (RFC4214) - must come before 6to4 */ 844 if (dev->priv_flags & IFF_ISATAP) { 845 struct neighbour *neigh = NULL; 846 bool do_tx_error = false; 847 848 if (skb_dst(skb)) 849 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 850 851 if (!neigh) { 852 net_dbg_ratelimited("nexthop == NULL\n"); 853 goto tx_error; 854 } 855 856 addr6 = (const struct in6_addr *)&neigh->primary_key; 857 addr_type = ipv6_addr_type(addr6); 858 859 if ((addr_type & IPV6_ADDR_UNICAST) && 860 ipv6_addr_is_isatap(addr6)) 861 dst = addr6->s6_addr32[3]; 862 else 863 do_tx_error = true; 864 865 neigh_release(neigh); 866 if (do_tx_error) 867 goto tx_error; 868 } 869 870 if (!dst) 871 dst = try_6rd(tunnel, &iph6->daddr); 872 873 if (!dst) { 874 struct neighbour *neigh = NULL; 875 bool do_tx_error = false; 876 877 if (skb_dst(skb)) 878 neigh = dst_neigh_lookup(skb_dst(skb), &iph6->daddr); 879 880 if (!neigh) { 881 net_dbg_ratelimited("nexthop == NULL\n"); 882 goto tx_error; 883 } 884 885 addr6 = (const struct in6_addr *)&neigh->primary_key; 886 addr_type = ipv6_addr_type(addr6); 887 888 if (addr_type == IPV6_ADDR_ANY) { 889 addr6 = &ipv6_hdr(skb)->daddr; 890 addr_type = ipv6_addr_type(addr6); 891 } 892 893 if ((addr_type & IPV6_ADDR_COMPATv4) != 0) 894 dst = addr6->s6_addr32[3]; 895 else 896 do_tx_error = true; 897 898 neigh_release(neigh); 899 if (do_tx_error) 900 goto tx_error; 901 } 902 903 flowi4_init_output(&fl4, tunnel->parms.link, tunnel->fwmark, 904 RT_TOS(tos), RT_SCOPE_UNIVERSE, IPPROTO_IPV6, 905 0, dst, tiph->saddr, 0, 0, 906 sock_net_uid(tunnel->net, NULL)); 907 rt = ip_route_output_flow(tunnel->net, &fl4, NULL); 908 909 if (IS_ERR(rt)) { 910 dev->stats.tx_carrier_errors++; 911 goto tx_error_icmp; 912 } 913 if (rt->rt_type != RTN_UNICAST) { 914 ip_rt_put(rt); 915 dev->stats.tx_carrier_errors++; 916 goto tx_error_icmp; 917 } 918 tdev = rt->dst.dev; 919 920 if (tdev == dev) { 921 ip_rt_put(rt); 922 dev->stats.collisions++; 923 goto tx_error; 924 } 925 926 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) { 927 ip_rt_put(rt); 928 goto tx_error; 929 } 930 931 if (df) { 932 mtu = dst_mtu(&rt->dst) - t_hlen; 933 934 if (mtu < 68) { 935 dev->stats.collisions++; 936 ip_rt_put(rt); 937 goto tx_error; 938 } 939 940 if (mtu < IPV6_MIN_MTU) { 941 mtu = IPV6_MIN_MTU; 942 df = 0; 943 } 944 945 if (tunnel->parms.iph.daddr) 946 skb_dst_update_pmtu(skb, mtu); 947 948 if (skb->len > mtu && !skb_is_gso(skb)) { 949 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 950 ip_rt_put(rt); 951 goto tx_error; 952 } 953 } 954 955 if (tunnel->err_count > 0) { 956 if (time_before(jiffies, 957 tunnel->err_time + IPTUNNEL_ERR_TIMEO)) { 958 tunnel->err_count--; 959 dst_link_failure(skb); 960 } else 961 tunnel->err_count = 0; 962 } 963 964 /* 965 * Okay, now see if we can stuff it in the buffer as-is. 966 */ 967 max_headroom = LL_RESERVED_SPACE(tdev) + t_hlen; 968 969 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 970 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 971 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); 972 if (!new_skb) { 973 ip_rt_put(rt); 974 dev->stats.tx_dropped++; 975 kfree_skb(skb); 976 return NETDEV_TX_OK; 977 } 978 if (skb->sk) 979 skb_set_owner_w(new_skb, skb->sk); 980 dev_kfree_skb(skb); 981 skb = new_skb; 982 iph6 = ipv6_hdr(skb); 983 } 984 ttl = tiph->ttl; 985 if (ttl == 0) 986 ttl = iph6->hop_limit; 987 tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); 988 989 if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0) { 990 ip_rt_put(rt); 991 goto tx_error; 992 } 993 994 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 995 996 iptunnel_xmit(NULL, rt, skb, fl4.saddr, fl4.daddr, protocol, tos, ttl, 997 df, !net_eq(tunnel->net, dev_net(dev))); 998 return NETDEV_TX_OK; 999 1000 tx_error_icmp: 1001 dst_link_failure(skb); 1002 tx_error: 1003 kfree_skb(skb); 1004 dev->stats.tx_errors++; 1005 return NETDEV_TX_OK; 1006 } 1007 1008 static netdev_tx_t sit_tunnel_xmit__(struct sk_buff *skb, 1009 struct net_device *dev, u8 ipproto) 1010 { 1011 struct ip_tunnel *tunnel = netdev_priv(dev); 1012 const struct iphdr *tiph = &tunnel->parms.iph; 1013 1014 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP4)) 1015 goto tx_error; 1016 1017 skb_set_inner_ipproto(skb, ipproto); 1018 1019 ip_tunnel_xmit(skb, dev, tiph, ipproto); 1020 return NETDEV_TX_OK; 1021 tx_error: 1022 kfree_skb(skb); 1023 dev->stats.tx_errors++; 1024 return NETDEV_TX_OK; 1025 } 1026 1027 static netdev_tx_t sit_tunnel_xmit(struct sk_buff *skb, 1028 struct net_device *dev) 1029 { 1030 if (!pskb_inet_may_pull(skb)) 1031 goto tx_err; 1032 1033 switch (skb->protocol) { 1034 case htons(ETH_P_IP): 1035 sit_tunnel_xmit__(skb, dev, IPPROTO_IPIP); 1036 break; 1037 case htons(ETH_P_IPV6): 1038 ipip6_tunnel_xmit(skb, dev); 1039 break; 1040 #if IS_ENABLED(CONFIG_MPLS) 1041 case htons(ETH_P_MPLS_UC): 1042 sit_tunnel_xmit__(skb, dev, IPPROTO_MPLS); 1043 break; 1044 #endif 1045 default: 1046 goto tx_err; 1047 } 1048 1049 return NETDEV_TX_OK; 1050 1051 tx_err: 1052 dev->stats.tx_errors++; 1053 kfree_skb(skb); 1054 return NETDEV_TX_OK; 1055 1056 } 1057 1058 static void ipip6_tunnel_bind_dev(struct net_device *dev) 1059 { 1060 struct net_device *tdev = NULL; 1061 struct ip_tunnel *tunnel; 1062 const struct iphdr *iph; 1063 struct flowi4 fl4; 1064 1065 tunnel = netdev_priv(dev); 1066 iph = &tunnel->parms.iph; 1067 1068 if (iph->daddr) { 1069 struct rtable *rt = ip_route_output_ports(tunnel->net, &fl4, 1070 NULL, 1071 iph->daddr, iph->saddr, 1072 0, 0, 1073 IPPROTO_IPV6, 1074 RT_TOS(iph->tos), 1075 tunnel->parms.link); 1076 1077 if (!IS_ERR(rt)) { 1078 tdev = rt->dst.dev; 1079 ip_rt_put(rt); 1080 } 1081 dev->flags |= IFF_POINTOPOINT; 1082 } 1083 1084 if (!tdev && tunnel->parms.link) 1085 tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link); 1086 1087 if (tdev && !netif_is_l3_master(tdev)) { 1088 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1089 1090 dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr); 1091 dev->mtu = tdev->mtu - t_hlen; 1092 if (dev->mtu < IPV6_MIN_MTU) 1093 dev->mtu = IPV6_MIN_MTU; 1094 } 1095 } 1096 1097 static void ipip6_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p, 1098 __u32 fwmark) 1099 { 1100 struct net *net = t->net; 1101 struct sit_net *sitn = net_generic(net, sit_net_id); 1102 1103 ipip6_tunnel_unlink(sitn, t); 1104 synchronize_net(); 1105 t->parms.iph.saddr = p->iph.saddr; 1106 t->parms.iph.daddr = p->iph.daddr; 1107 memcpy(t->dev->dev_addr, &p->iph.saddr, 4); 1108 memcpy(t->dev->broadcast, &p->iph.daddr, 4); 1109 ipip6_tunnel_link(sitn, t); 1110 t->parms.iph.ttl = p->iph.ttl; 1111 t->parms.iph.tos = p->iph.tos; 1112 t->parms.iph.frag_off = p->iph.frag_off; 1113 if (t->parms.link != p->link || t->fwmark != fwmark) { 1114 t->parms.link = p->link; 1115 t->fwmark = fwmark; 1116 ipip6_tunnel_bind_dev(t->dev); 1117 } 1118 dst_cache_reset(&t->dst_cache); 1119 netdev_state_change(t->dev); 1120 } 1121 1122 #ifdef CONFIG_IPV6_SIT_6RD 1123 static int ipip6_tunnel_update_6rd(struct ip_tunnel *t, 1124 struct ip_tunnel_6rd *ip6rd) 1125 { 1126 struct in6_addr prefix; 1127 __be32 relay_prefix; 1128 1129 if (ip6rd->relay_prefixlen > 32 || 1130 ip6rd->prefixlen + (32 - ip6rd->relay_prefixlen) > 64) 1131 return -EINVAL; 1132 1133 ipv6_addr_prefix(&prefix, &ip6rd->prefix, ip6rd->prefixlen); 1134 if (!ipv6_addr_equal(&prefix, &ip6rd->prefix)) 1135 return -EINVAL; 1136 if (ip6rd->relay_prefixlen) 1137 relay_prefix = ip6rd->relay_prefix & 1138 htonl(0xffffffffUL << 1139 (32 - ip6rd->relay_prefixlen)); 1140 else 1141 relay_prefix = 0; 1142 if (relay_prefix != ip6rd->relay_prefix) 1143 return -EINVAL; 1144 1145 t->ip6rd.prefix = prefix; 1146 t->ip6rd.relay_prefix = relay_prefix; 1147 t->ip6rd.prefixlen = ip6rd->prefixlen; 1148 t->ip6rd.relay_prefixlen = ip6rd->relay_prefixlen; 1149 dst_cache_reset(&t->dst_cache); 1150 netdev_state_change(t->dev); 1151 return 0; 1152 } 1153 #endif 1154 1155 static bool ipip6_valid_ip_proto(u8 ipproto) 1156 { 1157 return ipproto == IPPROTO_IPV6 || 1158 ipproto == IPPROTO_IPIP || 1159 #if IS_ENABLED(CONFIG_MPLS) 1160 ipproto == IPPROTO_MPLS || 1161 #endif 1162 ipproto == 0; 1163 } 1164 1165 static int 1166 ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1167 { 1168 int err = 0; 1169 struct ip_tunnel_parm p; 1170 struct ip_tunnel_prl prl; 1171 struct ip_tunnel *t = netdev_priv(dev); 1172 struct net *net = t->net; 1173 struct sit_net *sitn = net_generic(net, sit_net_id); 1174 #ifdef CONFIG_IPV6_SIT_6RD 1175 struct ip_tunnel_6rd ip6rd; 1176 #endif 1177 1178 switch (cmd) { 1179 case SIOCGETTUNNEL: 1180 #ifdef CONFIG_IPV6_SIT_6RD 1181 case SIOCGET6RD: 1182 #endif 1183 if (dev == sitn->fb_tunnel_dev) { 1184 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1185 err = -EFAULT; 1186 break; 1187 } 1188 t = ipip6_tunnel_locate(net, &p, 0); 1189 if (!t) 1190 t = netdev_priv(dev); 1191 } 1192 1193 err = -EFAULT; 1194 if (cmd == SIOCGETTUNNEL) { 1195 memcpy(&p, &t->parms, sizeof(p)); 1196 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, 1197 sizeof(p))) 1198 goto done; 1199 #ifdef CONFIG_IPV6_SIT_6RD 1200 } else { 1201 ip6rd.prefix = t->ip6rd.prefix; 1202 ip6rd.relay_prefix = t->ip6rd.relay_prefix; 1203 ip6rd.prefixlen = t->ip6rd.prefixlen; 1204 ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen; 1205 if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd, 1206 sizeof(ip6rd))) 1207 goto done; 1208 #endif 1209 } 1210 err = 0; 1211 break; 1212 1213 case SIOCADDTUNNEL: 1214 case SIOCCHGTUNNEL: 1215 err = -EPERM; 1216 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1217 goto done; 1218 1219 err = -EFAULT; 1220 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1221 goto done; 1222 1223 err = -EINVAL; 1224 if (!ipip6_valid_ip_proto(p.iph.protocol)) 1225 goto done; 1226 if (p.iph.version != 4 || 1227 p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF))) 1228 goto done; 1229 if (p.iph.ttl) 1230 p.iph.frag_off |= htons(IP_DF); 1231 1232 t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL); 1233 1234 if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) { 1235 if (t) { 1236 if (t->dev != dev) { 1237 err = -EEXIST; 1238 break; 1239 } 1240 } else { 1241 if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) || 1242 (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) { 1243 err = -EINVAL; 1244 break; 1245 } 1246 t = netdev_priv(dev); 1247 } 1248 1249 ipip6_tunnel_update(t, &p, t->fwmark); 1250 } 1251 1252 if (t) { 1253 err = 0; 1254 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p))) 1255 err = -EFAULT; 1256 } else 1257 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1258 break; 1259 1260 case SIOCDELTUNNEL: 1261 err = -EPERM; 1262 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1263 goto done; 1264 1265 if (dev == sitn->fb_tunnel_dev) { 1266 err = -EFAULT; 1267 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1268 goto done; 1269 err = -ENOENT; 1270 t = ipip6_tunnel_locate(net, &p, 0); 1271 if (!t) 1272 goto done; 1273 err = -EPERM; 1274 if (t == netdev_priv(sitn->fb_tunnel_dev)) 1275 goto done; 1276 dev = t->dev; 1277 } 1278 unregister_netdevice(dev); 1279 err = 0; 1280 break; 1281 1282 case SIOCGETPRL: 1283 err = -EINVAL; 1284 if (dev == sitn->fb_tunnel_dev) 1285 goto done; 1286 err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data); 1287 break; 1288 1289 case SIOCADDPRL: 1290 case SIOCDELPRL: 1291 case SIOCCHGPRL: 1292 err = -EPERM; 1293 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1294 goto done; 1295 err = -EINVAL; 1296 if (dev == sitn->fb_tunnel_dev) 1297 goto done; 1298 err = -EFAULT; 1299 if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl))) 1300 goto done; 1301 1302 switch (cmd) { 1303 case SIOCDELPRL: 1304 err = ipip6_tunnel_del_prl(t, &prl); 1305 break; 1306 case SIOCADDPRL: 1307 case SIOCCHGPRL: 1308 err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL); 1309 break; 1310 } 1311 dst_cache_reset(&t->dst_cache); 1312 netdev_state_change(dev); 1313 break; 1314 1315 #ifdef CONFIG_IPV6_SIT_6RD 1316 case SIOCADD6RD: 1317 case SIOCCHG6RD: 1318 case SIOCDEL6RD: 1319 err = -EPERM; 1320 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1321 goto done; 1322 1323 err = -EFAULT; 1324 if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data, 1325 sizeof(ip6rd))) 1326 goto done; 1327 1328 if (cmd != SIOCDEL6RD) { 1329 err = ipip6_tunnel_update_6rd(t, &ip6rd); 1330 if (err < 0) 1331 goto done; 1332 } else 1333 ipip6_tunnel_clone_6rd(dev, sitn); 1334 1335 err = 0; 1336 break; 1337 #endif 1338 1339 default: 1340 err = -EINVAL; 1341 } 1342 1343 done: 1344 return err; 1345 } 1346 1347 static const struct net_device_ops ipip6_netdev_ops = { 1348 .ndo_init = ipip6_tunnel_init, 1349 .ndo_uninit = ipip6_tunnel_uninit, 1350 .ndo_start_xmit = sit_tunnel_xmit, 1351 .ndo_do_ioctl = ipip6_tunnel_ioctl, 1352 .ndo_get_stats64 = ip_tunnel_get_stats64, 1353 .ndo_get_iflink = ip_tunnel_get_iflink, 1354 }; 1355 1356 static void ipip6_dev_free(struct net_device *dev) 1357 { 1358 struct ip_tunnel *tunnel = netdev_priv(dev); 1359 1360 dst_cache_destroy(&tunnel->dst_cache); 1361 free_percpu(dev->tstats); 1362 } 1363 1364 #define SIT_FEATURES (NETIF_F_SG | \ 1365 NETIF_F_FRAGLIST | \ 1366 NETIF_F_HIGHDMA | \ 1367 NETIF_F_GSO_SOFTWARE | \ 1368 NETIF_F_HW_CSUM) 1369 1370 static void ipip6_tunnel_setup(struct net_device *dev) 1371 { 1372 struct ip_tunnel *tunnel = netdev_priv(dev); 1373 int t_hlen = tunnel->hlen + sizeof(struct iphdr); 1374 1375 dev->netdev_ops = &ipip6_netdev_ops; 1376 dev->needs_free_netdev = true; 1377 dev->priv_destructor = ipip6_dev_free; 1378 1379 dev->type = ARPHRD_SIT; 1380 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1381 dev->mtu = ETH_DATA_LEN - t_hlen; 1382 dev->min_mtu = IPV6_MIN_MTU; 1383 dev->max_mtu = IP6_MAX_MTU - t_hlen; 1384 dev->flags = IFF_NOARP; 1385 netif_keep_dst(dev); 1386 dev->addr_len = 4; 1387 dev->features |= NETIF_F_LLTX; 1388 dev->features |= SIT_FEATURES; 1389 dev->hw_features |= SIT_FEATURES; 1390 } 1391 1392 static int ipip6_tunnel_init(struct net_device *dev) 1393 { 1394 struct ip_tunnel *tunnel = netdev_priv(dev); 1395 int err; 1396 1397 tunnel->dev = dev; 1398 tunnel->net = dev_net(dev); 1399 strcpy(tunnel->parms.name, dev->name); 1400 1401 ipip6_tunnel_bind_dev(dev); 1402 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1403 if (!dev->tstats) 1404 return -ENOMEM; 1405 1406 err = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL); 1407 if (err) { 1408 free_percpu(dev->tstats); 1409 dev->tstats = NULL; 1410 return err; 1411 } 1412 1413 return 0; 1414 } 1415 1416 static void __net_init ipip6_fb_tunnel_init(struct net_device *dev) 1417 { 1418 struct ip_tunnel *tunnel = netdev_priv(dev); 1419 struct iphdr *iph = &tunnel->parms.iph; 1420 struct net *net = dev_net(dev); 1421 struct sit_net *sitn = net_generic(net, sit_net_id); 1422 1423 iph->version = 4; 1424 iph->protocol = IPPROTO_IPV6; 1425 iph->ihl = 5; 1426 iph->ttl = 64; 1427 1428 dev_hold(dev); 1429 rcu_assign_pointer(sitn->tunnels_wc[0], tunnel); 1430 } 1431 1432 static int ipip6_validate(struct nlattr *tb[], struct nlattr *data[], 1433 struct netlink_ext_ack *extack) 1434 { 1435 u8 proto; 1436 1437 if (!data || !data[IFLA_IPTUN_PROTO]) 1438 return 0; 1439 1440 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1441 if (!ipip6_valid_ip_proto(proto)) 1442 return -EINVAL; 1443 1444 return 0; 1445 } 1446 1447 static void ipip6_netlink_parms(struct nlattr *data[], 1448 struct ip_tunnel_parm *parms, 1449 __u32 *fwmark) 1450 { 1451 memset(parms, 0, sizeof(*parms)); 1452 1453 parms->iph.version = 4; 1454 parms->iph.protocol = IPPROTO_IPV6; 1455 parms->iph.ihl = 5; 1456 parms->iph.ttl = 64; 1457 1458 if (!data) 1459 return; 1460 1461 if (data[IFLA_IPTUN_LINK]) 1462 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1463 1464 if (data[IFLA_IPTUN_LOCAL]) 1465 parms->iph.saddr = nla_get_be32(data[IFLA_IPTUN_LOCAL]); 1466 1467 if (data[IFLA_IPTUN_REMOTE]) 1468 parms->iph.daddr = nla_get_be32(data[IFLA_IPTUN_REMOTE]); 1469 1470 if (data[IFLA_IPTUN_TTL]) { 1471 parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]); 1472 if (parms->iph.ttl) 1473 parms->iph.frag_off = htons(IP_DF); 1474 } 1475 1476 if (data[IFLA_IPTUN_TOS]) 1477 parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]); 1478 1479 if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC])) 1480 parms->iph.frag_off = htons(IP_DF); 1481 1482 if (data[IFLA_IPTUN_FLAGS]) 1483 parms->i_flags = nla_get_be16(data[IFLA_IPTUN_FLAGS]); 1484 1485 if (data[IFLA_IPTUN_PROTO]) 1486 parms->iph.protocol = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1487 1488 if (data[IFLA_IPTUN_FWMARK]) 1489 *fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1490 } 1491 1492 /* This function returns true when ENCAP attributes are present in the nl msg */ 1493 static bool ipip6_netlink_encap_parms(struct nlattr *data[], 1494 struct ip_tunnel_encap *ipencap) 1495 { 1496 bool ret = false; 1497 1498 memset(ipencap, 0, sizeof(*ipencap)); 1499 1500 if (!data) 1501 return ret; 1502 1503 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1504 ret = true; 1505 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1506 } 1507 1508 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1509 ret = true; 1510 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1511 } 1512 1513 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1514 ret = true; 1515 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1516 } 1517 1518 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1519 ret = true; 1520 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1521 } 1522 1523 return ret; 1524 } 1525 1526 #ifdef CONFIG_IPV6_SIT_6RD 1527 /* This function returns true when 6RD attributes are present in the nl msg */ 1528 static bool ipip6_netlink_6rd_parms(struct nlattr *data[], 1529 struct ip_tunnel_6rd *ip6rd) 1530 { 1531 bool ret = false; 1532 memset(ip6rd, 0, sizeof(*ip6rd)); 1533 1534 if (!data) 1535 return ret; 1536 1537 if (data[IFLA_IPTUN_6RD_PREFIX]) { 1538 ret = true; 1539 ip6rd->prefix = nla_get_in6_addr(data[IFLA_IPTUN_6RD_PREFIX]); 1540 } 1541 1542 if (data[IFLA_IPTUN_6RD_RELAY_PREFIX]) { 1543 ret = true; 1544 ip6rd->relay_prefix = 1545 nla_get_be32(data[IFLA_IPTUN_6RD_RELAY_PREFIX]); 1546 } 1547 1548 if (data[IFLA_IPTUN_6RD_PREFIXLEN]) { 1549 ret = true; 1550 ip6rd->prefixlen = nla_get_u16(data[IFLA_IPTUN_6RD_PREFIXLEN]); 1551 } 1552 1553 if (data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) { 1554 ret = true; 1555 ip6rd->relay_prefixlen = 1556 nla_get_u16(data[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 1557 } 1558 1559 return ret; 1560 } 1561 #endif 1562 1563 static int ipip6_newlink(struct net *src_net, struct net_device *dev, 1564 struct nlattr *tb[], struct nlattr *data[], 1565 struct netlink_ext_ack *extack) 1566 { 1567 struct net *net = dev_net(dev); 1568 struct ip_tunnel *nt; 1569 struct ip_tunnel_encap ipencap; 1570 #ifdef CONFIG_IPV6_SIT_6RD 1571 struct ip_tunnel_6rd ip6rd; 1572 #endif 1573 int err; 1574 1575 nt = netdev_priv(dev); 1576 1577 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1578 err = ip_tunnel_encap_setup(nt, &ipencap); 1579 if (err < 0) 1580 return err; 1581 } 1582 1583 ipip6_netlink_parms(data, &nt->parms, &nt->fwmark); 1584 1585 if (ipip6_tunnel_locate(net, &nt->parms, 0)) 1586 return -EEXIST; 1587 1588 err = ipip6_tunnel_create(dev); 1589 if (err < 0) 1590 return err; 1591 1592 if (tb[IFLA_MTU]) { 1593 u32 mtu = nla_get_u32(tb[IFLA_MTU]); 1594 1595 if (mtu >= IPV6_MIN_MTU && 1596 mtu <= IP6_MAX_MTU - dev->hard_header_len) 1597 dev->mtu = mtu; 1598 } 1599 1600 #ifdef CONFIG_IPV6_SIT_6RD 1601 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1602 err = ipip6_tunnel_update_6rd(nt, &ip6rd); 1603 #endif 1604 1605 return err; 1606 } 1607 1608 static int ipip6_changelink(struct net_device *dev, struct nlattr *tb[], 1609 struct nlattr *data[], 1610 struct netlink_ext_ack *extack) 1611 { 1612 struct ip_tunnel *t = netdev_priv(dev); 1613 struct ip_tunnel_parm p; 1614 struct ip_tunnel_encap ipencap; 1615 struct net *net = t->net; 1616 struct sit_net *sitn = net_generic(net, sit_net_id); 1617 #ifdef CONFIG_IPV6_SIT_6RD 1618 struct ip_tunnel_6rd ip6rd; 1619 #endif 1620 __u32 fwmark = t->fwmark; 1621 int err; 1622 1623 if (dev == sitn->fb_tunnel_dev) 1624 return -EINVAL; 1625 1626 if (ipip6_netlink_encap_parms(data, &ipencap)) { 1627 err = ip_tunnel_encap_setup(t, &ipencap); 1628 if (err < 0) 1629 return err; 1630 } 1631 1632 ipip6_netlink_parms(data, &p, &fwmark); 1633 1634 if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) || 1635 (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr)) 1636 return -EINVAL; 1637 1638 t = ipip6_tunnel_locate(net, &p, 0); 1639 1640 if (t) { 1641 if (t->dev != dev) 1642 return -EEXIST; 1643 } else 1644 t = netdev_priv(dev); 1645 1646 ipip6_tunnel_update(t, &p, fwmark); 1647 1648 #ifdef CONFIG_IPV6_SIT_6RD 1649 if (ipip6_netlink_6rd_parms(data, &ip6rd)) 1650 return ipip6_tunnel_update_6rd(t, &ip6rd); 1651 #endif 1652 1653 return 0; 1654 } 1655 1656 static size_t ipip6_get_size(const struct net_device *dev) 1657 { 1658 return 1659 /* IFLA_IPTUN_LINK */ 1660 nla_total_size(4) + 1661 /* IFLA_IPTUN_LOCAL */ 1662 nla_total_size(4) + 1663 /* IFLA_IPTUN_REMOTE */ 1664 nla_total_size(4) + 1665 /* IFLA_IPTUN_TTL */ 1666 nla_total_size(1) + 1667 /* IFLA_IPTUN_TOS */ 1668 nla_total_size(1) + 1669 /* IFLA_IPTUN_PMTUDISC */ 1670 nla_total_size(1) + 1671 /* IFLA_IPTUN_FLAGS */ 1672 nla_total_size(2) + 1673 /* IFLA_IPTUN_PROTO */ 1674 nla_total_size(1) + 1675 #ifdef CONFIG_IPV6_SIT_6RD 1676 /* IFLA_IPTUN_6RD_PREFIX */ 1677 nla_total_size(sizeof(struct in6_addr)) + 1678 /* IFLA_IPTUN_6RD_RELAY_PREFIX */ 1679 nla_total_size(4) + 1680 /* IFLA_IPTUN_6RD_PREFIXLEN */ 1681 nla_total_size(2) + 1682 /* IFLA_IPTUN_6RD_RELAY_PREFIXLEN */ 1683 nla_total_size(2) + 1684 #endif 1685 /* IFLA_IPTUN_ENCAP_TYPE */ 1686 nla_total_size(2) + 1687 /* IFLA_IPTUN_ENCAP_FLAGS */ 1688 nla_total_size(2) + 1689 /* IFLA_IPTUN_ENCAP_SPORT */ 1690 nla_total_size(2) + 1691 /* IFLA_IPTUN_ENCAP_DPORT */ 1692 nla_total_size(2) + 1693 /* IFLA_IPTUN_FWMARK */ 1694 nla_total_size(4) + 1695 0; 1696 } 1697 1698 static int ipip6_fill_info(struct sk_buff *skb, const struct net_device *dev) 1699 { 1700 struct ip_tunnel *tunnel = netdev_priv(dev); 1701 struct ip_tunnel_parm *parm = &tunnel->parms; 1702 1703 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1704 nla_put_in_addr(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) || 1705 nla_put_in_addr(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) || 1706 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) || 1707 nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) || 1708 nla_put_u8(skb, IFLA_IPTUN_PMTUDISC, 1709 !!(parm->iph.frag_off & htons(IP_DF))) || 1710 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->iph.protocol) || 1711 nla_put_be16(skb, IFLA_IPTUN_FLAGS, parm->i_flags) || 1712 nla_put_u32(skb, IFLA_IPTUN_FWMARK, tunnel->fwmark)) 1713 goto nla_put_failure; 1714 1715 #ifdef CONFIG_IPV6_SIT_6RD 1716 if (nla_put_in6_addr(skb, IFLA_IPTUN_6RD_PREFIX, 1717 &tunnel->ip6rd.prefix) || 1718 nla_put_in_addr(skb, IFLA_IPTUN_6RD_RELAY_PREFIX, 1719 tunnel->ip6rd.relay_prefix) || 1720 nla_put_u16(skb, IFLA_IPTUN_6RD_PREFIXLEN, 1721 tunnel->ip6rd.prefixlen) || 1722 nla_put_u16(skb, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 1723 tunnel->ip6rd.relay_prefixlen)) 1724 goto nla_put_failure; 1725 #endif 1726 1727 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, 1728 tunnel->encap.type) || 1729 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, 1730 tunnel->encap.sport) || 1731 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, 1732 tunnel->encap.dport) || 1733 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, 1734 tunnel->encap.flags)) 1735 goto nla_put_failure; 1736 1737 return 0; 1738 1739 nla_put_failure: 1740 return -EMSGSIZE; 1741 } 1742 1743 static const struct nla_policy ipip6_policy[IFLA_IPTUN_MAX + 1] = { 1744 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1745 [IFLA_IPTUN_LOCAL] = { .type = NLA_U32 }, 1746 [IFLA_IPTUN_REMOTE] = { .type = NLA_U32 }, 1747 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1748 [IFLA_IPTUN_TOS] = { .type = NLA_U8 }, 1749 [IFLA_IPTUN_PMTUDISC] = { .type = NLA_U8 }, 1750 [IFLA_IPTUN_FLAGS] = { .type = NLA_U16 }, 1751 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1752 #ifdef CONFIG_IPV6_SIT_6RD 1753 [IFLA_IPTUN_6RD_PREFIX] = { .len = sizeof(struct in6_addr) }, 1754 [IFLA_IPTUN_6RD_RELAY_PREFIX] = { .type = NLA_U32 }, 1755 [IFLA_IPTUN_6RD_PREFIXLEN] = { .type = NLA_U16 }, 1756 [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 }, 1757 #endif 1758 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 1759 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 1760 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 1761 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 1762 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 1763 }; 1764 1765 static void ipip6_dellink(struct net_device *dev, struct list_head *head) 1766 { 1767 struct net *net = dev_net(dev); 1768 struct sit_net *sitn = net_generic(net, sit_net_id); 1769 1770 if (dev != sitn->fb_tunnel_dev) 1771 unregister_netdevice_queue(dev, head); 1772 } 1773 1774 static struct rtnl_link_ops sit_link_ops __read_mostly = { 1775 .kind = "sit", 1776 .maxtype = IFLA_IPTUN_MAX, 1777 .policy = ipip6_policy, 1778 .priv_size = sizeof(struct ip_tunnel), 1779 .setup = ipip6_tunnel_setup, 1780 .validate = ipip6_validate, 1781 .newlink = ipip6_newlink, 1782 .changelink = ipip6_changelink, 1783 .get_size = ipip6_get_size, 1784 .fill_info = ipip6_fill_info, 1785 .dellink = ipip6_dellink, 1786 .get_link_net = ip_tunnel_get_link_net, 1787 }; 1788 1789 static struct xfrm_tunnel sit_handler __read_mostly = { 1790 .handler = ipip6_rcv, 1791 .err_handler = ipip6_err, 1792 .priority = 1, 1793 }; 1794 1795 static struct xfrm_tunnel ipip_handler __read_mostly = { 1796 .handler = ipip_rcv, 1797 .err_handler = ipip6_err, 1798 .priority = 2, 1799 }; 1800 1801 #if IS_ENABLED(CONFIG_MPLS) 1802 static struct xfrm_tunnel mplsip_handler __read_mostly = { 1803 .handler = mplsip_rcv, 1804 .err_handler = ipip6_err, 1805 .priority = 2, 1806 }; 1807 #endif 1808 1809 static void __net_exit sit_destroy_tunnels(struct net *net, 1810 struct list_head *head) 1811 { 1812 struct sit_net *sitn = net_generic(net, sit_net_id); 1813 struct net_device *dev, *aux; 1814 int prio; 1815 1816 for_each_netdev_safe(net, dev, aux) 1817 if (dev->rtnl_link_ops == &sit_link_ops) 1818 unregister_netdevice_queue(dev, head); 1819 1820 for (prio = 1; prio < 4; prio++) { 1821 int h; 1822 for (h = 0; h < IP6_SIT_HASH_SIZE; h++) { 1823 struct ip_tunnel *t; 1824 1825 t = rtnl_dereference(sitn->tunnels[prio][h]); 1826 while (t) { 1827 /* If dev is in the same netns, it has already 1828 * been added to the list by the previous loop. 1829 */ 1830 if (!net_eq(dev_net(t->dev), net)) 1831 unregister_netdevice_queue(t->dev, 1832 head); 1833 t = rtnl_dereference(t->next); 1834 } 1835 } 1836 } 1837 } 1838 1839 static int __net_init sit_init_net(struct net *net) 1840 { 1841 struct sit_net *sitn = net_generic(net, sit_net_id); 1842 struct ip_tunnel *t; 1843 int err; 1844 1845 sitn->tunnels[0] = sitn->tunnels_wc; 1846 sitn->tunnels[1] = sitn->tunnels_l; 1847 sitn->tunnels[2] = sitn->tunnels_r; 1848 sitn->tunnels[3] = sitn->tunnels_r_l; 1849 1850 if (!net_has_fallback_tunnels(net)) 1851 return 0; 1852 1853 sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0", 1854 NET_NAME_UNKNOWN, 1855 ipip6_tunnel_setup); 1856 if (!sitn->fb_tunnel_dev) { 1857 err = -ENOMEM; 1858 goto err_alloc_dev; 1859 } 1860 dev_net_set(sitn->fb_tunnel_dev, net); 1861 sitn->fb_tunnel_dev->rtnl_link_ops = &sit_link_ops; 1862 /* FB netdevice is special: we have one, and only one per netns. 1863 * Allowing to move it to another netns is clearly unsafe. 1864 */ 1865 sitn->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL; 1866 1867 err = register_netdev(sitn->fb_tunnel_dev); 1868 if (err) 1869 goto err_reg_dev; 1870 1871 ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn); 1872 ipip6_fb_tunnel_init(sitn->fb_tunnel_dev); 1873 1874 t = netdev_priv(sitn->fb_tunnel_dev); 1875 1876 strcpy(t->parms.name, sitn->fb_tunnel_dev->name); 1877 return 0; 1878 1879 err_reg_dev: 1880 ipip6_dev_free(sitn->fb_tunnel_dev); 1881 free_netdev(sitn->fb_tunnel_dev); 1882 err_alloc_dev: 1883 return err; 1884 } 1885 1886 static void __net_exit sit_exit_batch_net(struct list_head *net_list) 1887 { 1888 LIST_HEAD(list); 1889 struct net *net; 1890 1891 rtnl_lock(); 1892 list_for_each_entry(net, net_list, exit_list) 1893 sit_destroy_tunnels(net, &list); 1894 1895 unregister_netdevice_many(&list); 1896 rtnl_unlock(); 1897 } 1898 1899 static struct pernet_operations sit_net_ops = { 1900 .init = sit_init_net, 1901 .exit_batch = sit_exit_batch_net, 1902 .id = &sit_net_id, 1903 .size = sizeof(struct sit_net), 1904 }; 1905 1906 static void __exit sit_cleanup(void) 1907 { 1908 rtnl_link_unregister(&sit_link_ops); 1909 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1910 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1911 #if IS_ENABLED(CONFIG_MPLS) 1912 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1913 #endif 1914 1915 unregister_pernet_device(&sit_net_ops); 1916 rcu_barrier(); /* Wait for completion of call_rcu()'s */ 1917 } 1918 1919 static int __init sit_init(void) 1920 { 1921 int err; 1922 1923 pr_info("IPv6, IPv4 and MPLS over IPv4 tunneling driver\n"); 1924 1925 err = register_pernet_device(&sit_net_ops); 1926 if (err < 0) 1927 return err; 1928 err = xfrm4_tunnel_register(&sit_handler, AF_INET6); 1929 if (err < 0) { 1930 pr_info("%s: can't register ip6ip4\n", __func__); 1931 goto xfrm_tunnel_failed; 1932 } 1933 err = xfrm4_tunnel_register(&ipip_handler, AF_INET); 1934 if (err < 0) { 1935 pr_info("%s: can't register ip4ip4\n", __func__); 1936 goto xfrm_tunnel4_failed; 1937 } 1938 #if IS_ENABLED(CONFIG_MPLS) 1939 err = xfrm4_tunnel_register(&mplsip_handler, AF_MPLS); 1940 if (err < 0) { 1941 pr_info("%s: can't register mplsip\n", __func__); 1942 goto xfrm_tunnel_mpls_failed; 1943 } 1944 #endif 1945 err = rtnl_link_register(&sit_link_ops); 1946 if (err < 0) 1947 goto rtnl_link_failed; 1948 1949 out: 1950 return err; 1951 1952 rtnl_link_failed: 1953 #if IS_ENABLED(CONFIG_MPLS) 1954 xfrm4_tunnel_deregister(&mplsip_handler, AF_MPLS); 1955 xfrm_tunnel_mpls_failed: 1956 #endif 1957 xfrm4_tunnel_deregister(&ipip_handler, AF_INET); 1958 xfrm_tunnel4_failed: 1959 xfrm4_tunnel_deregister(&sit_handler, AF_INET6); 1960 xfrm_tunnel_failed: 1961 unregister_pernet_device(&sit_net_ops); 1962 goto out; 1963 } 1964 1965 module_init(sit_init); 1966 module_exit(sit_cleanup); 1967 MODULE_LICENSE("GPL"); 1968 MODULE_ALIAS_RTNL_LINK("sit"); 1969 MODULE_ALIAS_NETDEV("sit0"); 1970