1 /* 2 * IPv6 tunneling device 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Ville Nuorvala <vnuorval@tcs.hut.fi> 7 * Yasuyuki Kozakai <kozakai@linux-ipv6.org> 8 * 9 * Based on: 10 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c 11 * 12 * RFC 2473 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * as published by the Free Software Foundation; either version 17 * 2 of the License, or (at your option) any later version. 18 * 19 */ 20 21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 22 23 #include <linux/module.h> 24 #include <linux/capability.h> 25 #include <linux/errno.h> 26 #include <linux/types.h> 27 #include <linux/sockios.h> 28 #include <linux/icmp.h> 29 #include <linux/if.h> 30 #include <linux/in.h> 31 #include <linux/ip.h> 32 #include <linux/net.h> 33 #include <linux/in6.h> 34 #include <linux/netdevice.h> 35 #include <linux/if_arp.h> 36 #include <linux/icmpv6.h> 37 #include <linux/init.h> 38 #include <linux/route.h> 39 #include <linux/rtnetlink.h> 40 #include <linux/netfilter_ipv6.h> 41 #include <linux/slab.h> 42 #include <linux/hash.h> 43 #include <linux/etherdevice.h> 44 45 #include <asm/uaccess.h> 46 #include <linux/atomic.h> 47 48 #include <net/icmp.h> 49 #include <net/ip.h> 50 #include <net/ip_tunnels.h> 51 #include <net/ipv6.h> 52 #include <net/ip6_route.h> 53 #include <net/addrconf.h> 54 #include <net/ip6_tunnel.h> 55 #include <net/xfrm.h> 56 #include <net/dsfield.h> 57 #include <net/inet_ecn.h> 58 #include <net/net_namespace.h> 59 #include <net/netns/generic.h> 60 61 MODULE_AUTHOR("Ville Nuorvala"); 62 MODULE_DESCRIPTION("IPv6 tunneling device"); 63 MODULE_LICENSE("GPL"); 64 MODULE_ALIAS_RTNL_LINK("ip6tnl"); 65 MODULE_ALIAS_NETDEV("ip6tnl0"); 66 67 #define HASH_SIZE_SHIFT 5 68 #define HASH_SIZE (1 << HASH_SIZE_SHIFT) 69 70 static bool log_ecn_error = true; 71 module_param(log_ecn_error, bool, 0644); 72 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 73 74 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) 75 { 76 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); 77 78 return hash_32(hash, HASH_SIZE_SHIFT); 79 } 80 81 static int ip6_tnl_dev_init(struct net_device *dev); 82 static void ip6_tnl_dev_setup(struct net_device *dev); 83 static struct rtnl_link_ops ip6_link_ops __read_mostly; 84 85 static int ip6_tnl_net_id __read_mostly; 86 struct ip6_tnl_net { 87 /* the IPv6 tunnel fallback device */ 88 struct net_device *fb_tnl_dev; 89 /* lists for storing tunnels in use */ 90 struct ip6_tnl __rcu *tnls_r_l[HASH_SIZE]; 91 struct ip6_tnl __rcu *tnls_wc[1]; 92 struct ip6_tnl __rcu **tnls[2]; 93 }; 94 95 static struct net_device_stats *ip6_get_stats(struct net_device *dev) 96 { 97 struct pcpu_sw_netstats tmp, sum = { 0 }; 98 int i; 99 100 for_each_possible_cpu(i) { 101 unsigned int start; 102 const struct pcpu_sw_netstats *tstats = 103 per_cpu_ptr(dev->tstats, i); 104 105 do { 106 start = u64_stats_fetch_begin_irq(&tstats->syncp); 107 tmp.rx_packets = tstats->rx_packets; 108 tmp.rx_bytes = tstats->rx_bytes; 109 tmp.tx_packets = tstats->tx_packets; 110 tmp.tx_bytes = tstats->tx_bytes; 111 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); 112 113 sum.rx_packets += tmp.rx_packets; 114 sum.rx_bytes += tmp.rx_bytes; 115 sum.tx_packets += tmp.tx_packets; 116 sum.tx_bytes += tmp.tx_bytes; 117 } 118 dev->stats.rx_packets = sum.rx_packets; 119 dev->stats.rx_bytes = sum.rx_bytes; 120 dev->stats.tx_packets = sum.tx_packets; 121 dev->stats.tx_bytes = sum.tx_bytes; 122 return &dev->stats; 123 } 124 125 /* 126 * Locking : hash tables are protected by RCU and RTNL 127 */ 128 129 struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) 130 { 131 struct dst_entry *dst = t->dst_cache; 132 133 if (dst && dst->obsolete && 134 !dst->ops->check(dst, t->dst_cookie)) { 135 t->dst_cache = NULL; 136 dst_release(dst); 137 return NULL; 138 } 139 140 return dst; 141 } 142 EXPORT_SYMBOL_GPL(ip6_tnl_dst_check); 143 144 void ip6_tnl_dst_reset(struct ip6_tnl *t) 145 { 146 dst_release(t->dst_cache); 147 t->dst_cache = NULL; 148 } 149 EXPORT_SYMBOL_GPL(ip6_tnl_dst_reset); 150 151 void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) 152 { 153 struct rt6_info *rt = (struct rt6_info *) dst; 154 t->dst_cookie = rt6_get_cookie(rt); 155 dst_release(t->dst_cache); 156 t->dst_cache = dst; 157 } 158 EXPORT_SYMBOL_GPL(ip6_tnl_dst_store); 159 160 /** 161 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses 162 * @remote: the address of the tunnel exit-point 163 * @local: the address of the tunnel entry-point 164 * 165 * Return: 166 * tunnel matching given end-points if found, 167 * else fallback tunnel if its device is up, 168 * else %NULL 169 **/ 170 171 #define for_each_ip6_tunnel_rcu(start) \ 172 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) 173 174 static struct ip6_tnl * 175 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) 176 { 177 unsigned int hash = HASH(remote, local); 178 struct ip6_tnl *t; 179 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 180 struct in6_addr any; 181 182 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 183 if (ipv6_addr_equal(local, &t->parms.laddr) && 184 ipv6_addr_equal(remote, &t->parms.raddr) && 185 (t->dev->flags & IFF_UP)) 186 return t; 187 } 188 189 memset(&any, 0, sizeof(any)); 190 hash = HASH(&any, local); 191 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 192 if (ipv6_addr_equal(local, &t->parms.laddr) && 193 (t->dev->flags & IFF_UP)) 194 return t; 195 } 196 197 hash = HASH(remote, &any); 198 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 199 if (ipv6_addr_equal(remote, &t->parms.raddr) && 200 (t->dev->flags & IFF_UP)) 201 return t; 202 } 203 204 t = rcu_dereference(ip6n->tnls_wc[0]); 205 if (t && (t->dev->flags & IFF_UP)) 206 return t; 207 208 return NULL; 209 } 210 211 /** 212 * ip6_tnl_bucket - get head of list matching given tunnel parameters 213 * @p: parameters containing tunnel end-points 214 * 215 * Description: 216 * ip6_tnl_bucket() returns the head of the list matching the 217 * &struct in6_addr entries laddr and raddr in @p. 218 * 219 * Return: head of IPv6 tunnel list 220 **/ 221 222 static struct ip6_tnl __rcu ** 223 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) 224 { 225 const struct in6_addr *remote = &p->raddr; 226 const struct in6_addr *local = &p->laddr; 227 unsigned int h = 0; 228 int prio = 0; 229 230 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { 231 prio = 1; 232 h = HASH(remote, local); 233 } 234 return &ip6n->tnls[prio][h]; 235 } 236 237 /** 238 * ip6_tnl_link - add tunnel to hash table 239 * @t: tunnel to be added 240 **/ 241 242 static void 243 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 244 { 245 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); 246 247 rcu_assign_pointer(t->next , rtnl_dereference(*tp)); 248 rcu_assign_pointer(*tp, t); 249 } 250 251 /** 252 * ip6_tnl_unlink - remove tunnel from hash table 253 * @t: tunnel to be removed 254 **/ 255 256 static void 257 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 258 { 259 struct ip6_tnl __rcu **tp; 260 struct ip6_tnl *iter; 261 262 for (tp = ip6_tnl_bucket(ip6n, &t->parms); 263 (iter = rtnl_dereference(*tp)) != NULL; 264 tp = &iter->next) { 265 if (t == iter) { 266 rcu_assign_pointer(*tp, t->next); 267 break; 268 } 269 } 270 } 271 272 static void ip6_dev_free(struct net_device *dev) 273 { 274 free_percpu(dev->tstats); 275 free_netdev(dev); 276 } 277 278 static int ip6_tnl_create2(struct net_device *dev) 279 { 280 struct ip6_tnl *t = netdev_priv(dev); 281 struct net *net = dev_net(dev); 282 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 283 int err; 284 285 t = netdev_priv(dev); 286 287 err = register_netdevice(dev); 288 if (err < 0) 289 goto out; 290 291 strcpy(t->parms.name, dev->name); 292 dev->rtnl_link_ops = &ip6_link_ops; 293 294 dev_hold(dev); 295 ip6_tnl_link(ip6n, t); 296 return 0; 297 298 out: 299 return err; 300 } 301 302 /** 303 * ip6_tnl_create - create a new tunnel 304 * @p: tunnel parameters 305 * @pt: pointer to new tunnel 306 * 307 * Description: 308 * Create tunnel matching given parameters. 309 * 310 * Return: 311 * created tunnel or error pointer 312 **/ 313 314 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) 315 { 316 struct net_device *dev; 317 struct ip6_tnl *t; 318 char name[IFNAMSIZ]; 319 int err = -ENOMEM; 320 321 if (p->name[0]) 322 strlcpy(name, p->name, IFNAMSIZ); 323 else 324 sprintf(name, "ip6tnl%%d"); 325 326 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 327 ip6_tnl_dev_setup); 328 if (!dev) 329 goto failed; 330 331 dev_net_set(dev, net); 332 333 t = netdev_priv(dev); 334 t->parms = *p; 335 t->net = dev_net(dev); 336 err = ip6_tnl_create2(dev); 337 if (err < 0) 338 goto failed_free; 339 340 return t; 341 342 failed_free: 343 ip6_dev_free(dev); 344 failed: 345 return ERR_PTR(err); 346 } 347 348 /** 349 * ip6_tnl_locate - find or create tunnel matching given parameters 350 * @p: tunnel parameters 351 * @create: != 0 if allowed to create new tunnel if no match found 352 * 353 * Description: 354 * ip6_tnl_locate() first tries to locate an existing tunnel 355 * based on @parms. If this is unsuccessful, but @create is set a new 356 * tunnel device is created and registered for use. 357 * 358 * Return: 359 * matching tunnel or error pointer 360 **/ 361 362 static struct ip6_tnl *ip6_tnl_locate(struct net *net, 363 struct __ip6_tnl_parm *p, int create) 364 { 365 const struct in6_addr *remote = &p->raddr; 366 const struct in6_addr *local = &p->laddr; 367 struct ip6_tnl __rcu **tp; 368 struct ip6_tnl *t; 369 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 370 371 for (tp = ip6_tnl_bucket(ip6n, p); 372 (t = rtnl_dereference(*tp)) != NULL; 373 tp = &t->next) { 374 if (ipv6_addr_equal(local, &t->parms.laddr) && 375 ipv6_addr_equal(remote, &t->parms.raddr)) { 376 if (create) 377 return ERR_PTR(-EEXIST); 378 379 return t; 380 } 381 } 382 if (!create) 383 return ERR_PTR(-ENODEV); 384 return ip6_tnl_create(net, p); 385 } 386 387 /** 388 * ip6_tnl_dev_uninit - tunnel device uninitializer 389 * @dev: the device to be destroyed 390 * 391 * Description: 392 * ip6_tnl_dev_uninit() removes tunnel from its list 393 **/ 394 395 static void 396 ip6_tnl_dev_uninit(struct net_device *dev) 397 { 398 struct ip6_tnl *t = netdev_priv(dev); 399 struct net *net = t->net; 400 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 401 402 if (dev == ip6n->fb_tnl_dev) 403 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); 404 else 405 ip6_tnl_unlink(ip6n, t); 406 ip6_tnl_dst_reset(t); 407 dev_put(dev); 408 } 409 410 /** 411 * parse_tvl_tnl_enc_lim - handle encapsulation limit option 412 * @skb: received socket buffer 413 * 414 * Return: 415 * 0 if none was found, 416 * else index to encapsulation limit 417 **/ 418 419 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) 420 { 421 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; 422 __u8 nexthdr = ipv6h->nexthdr; 423 __u16 off = sizeof(*ipv6h); 424 425 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { 426 __u16 optlen = 0; 427 struct ipv6_opt_hdr *hdr; 428 if (raw + off + sizeof(*hdr) > skb->data && 429 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) 430 break; 431 432 hdr = (struct ipv6_opt_hdr *) (raw + off); 433 if (nexthdr == NEXTHDR_FRAGMENT) { 434 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; 435 if (frag_hdr->frag_off) 436 break; 437 optlen = 8; 438 } else if (nexthdr == NEXTHDR_AUTH) { 439 optlen = (hdr->hdrlen + 2) << 2; 440 } else { 441 optlen = ipv6_optlen(hdr); 442 } 443 if (nexthdr == NEXTHDR_DEST) { 444 __u16 i = off + 2; 445 while (1) { 446 struct ipv6_tlv_tnl_enc_lim *tel; 447 448 /* No more room for encapsulation limit */ 449 if (i + sizeof (*tel) > off + optlen) 450 break; 451 452 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; 453 /* return index of option if found and valid */ 454 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && 455 tel->length == 1) 456 return i; 457 /* else jump to next option */ 458 if (tel->type) 459 i += tel->length + 2; 460 else 461 i++; 462 } 463 } 464 nexthdr = hdr->nexthdr; 465 off += optlen; 466 } 467 return 0; 468 } 469 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); 470 471 /** 472 * ip6_tnl_err - tunnel error handler 473 * 474 * Description: 475 * ip6_tnl_err() should handle errors in the tunnel according 476 * to the specifications in RFC 2473. 477 **/ 478 479 static int 480 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, 481 u8 *type, u8 *code, int *msg, __u32 *info, int offset) 482 { 483 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; 484 struct ip6_tnl *t; 485 int rel_msg = 0; 486 u8 rel_type = ICMPV6_DEST_UNREACH; 487 u8 rel_code = ICMPV6_ADDR_UNREACH; 488 u8 tproto; 489 __u32 rel_info = 0; 490 __u16 len; 491 int err = -ENOENT; 492 493 /* If the packet doesn't contain the original IPv6 header we are 494 in trouble since we might need the source address for further 495 processing of the error. */ 496 497 rcu_read_lock(); 498 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); 499 if (!t) 500 goto out; 501 502 tproto = ACCESS_ONCE(t->parms.proto); 503 if (tproto != ipproto && tproto != 0) 504 goto out; 505 506 err = 0; 507 508 switch (*type) { 509 __u32 teli; 510 struct ipv6_tlv_tnl_enc_lim *tel; 511 __u32 mtu; 512 case ICMPV6_DEST_UNREACH: 513 net_warn_ratelimited("%s: Path to destination invalid or inactive!\n", 514 t->parms.name); 515 rel_msg = 1; 516 break; 517 case ICMPV6_TIME_EXCEED: 518 if ((*code) == ICMPV6_EXC_HOPLIMIT) { 519 net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 520 t->parms.name); 521 rel_msg = 1; 522 } 523 break; 524 case ICMPV6_PARAMPROB: 525 teli = 0; 526 if ((*code) == ICMPV6_HDR_FIELD) 527 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 528 529 if (teli && teli == *info - 2) { 530 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 531 if (tel->encap_limit == 0) { 532 net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 533 t->parms.name); 534 rel_msg = 1; 535 } 536 } else { 537 net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 538 t->parms.name); 539 } 540 break; 541 case ICMPV6_PKT_TOOBIG: 542 mtu = *info - offset; 543 if (mtu < IPV6_MIN_MTU) 544 mtu = IPV6_MIN_MTU; 545 t->dev->mtu = mtu; 546 547 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); 548 if (len > mtu) { 549 rel_type = ICMPV6_PKT_TOOBIG; 550 rel_code = 0; 551 rel_info = mtu; 552 rel_msg = 1; 553 } 554 break; 555 } 556 557 *type = rel_type; 558 *code = rel_code; 559 *info = rel_info; 560 *msg = rel_msg; 561 562 out: 563 rcu_read_unlock(); 564 return err; 565 } 566 567 static int 568 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 569 u8 type, u8 code, int offset, __be32 info) 570 { 571 int rel_msg = 0; 572 u8 rel_type = type; 573 u8 rel_code = code; 574 __u32 rel_info = ntohl(info); 575 int err; 576 struct sk_buff *skb2; 577 const struct iphdr *eiph; 578 struct rtable *rt; 579 struct flowi4 fl4; 580 581 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, 582 &rel_msg, &rel_info, offset); 583 if (err < 0) 584 return err; 585 586 if (rel_msg == 0) 587 return 0; 588 589 switch (rel_type) { 590 case ICMPV6_DEST_UNREACH: 591 if (rel_code != ICMPV6_ADDR_UNREACH) 592 return 0; 593 rel_type = ICMP_DEST_UNREACH; 594 rel_code = ICMP_HOST_UNREACH; 595 break; 596 case ICMPV6_PKT_TOOBIG: 597 if (rel_code != 0) 598 return 0; 599 rel_type = ICMP_DEST_UNREACH; 600 rel_code = ICMP_FRAG_NEEDED; 601 break; 602 case NDISC_REDIRECT: 603 rel_type = ICMP_REDIRECT; 604 rel_code = ICMP_REDIR_HOST; 605 default: 606 return 0; 607 } 608 609 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) 610 return 0; 611 612 skb2 = skb_clone(skb, GFP_ATOMIC); 613 if (!skb2) 614 return 0; 615 616 skb_dst_drop(skb2); 617 618 skb_pull(skb2, offset); 619 skb_reset_network_header(skb2); 620 eiph = ip_hdr(skb2); 621 622 /* Try to guess incoming interface */ 623 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, 624 eiph->saddr, 0, 625 0, 0, 626 IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 627 if (IS_ERR(rt)) 628 goto out; 629 630 skb2->dev = rt->dst.dev; 631 632 /* route "incoming" packet */ 633 if (rt->rt_flags & RTCF_LOCAL) { 634 ip_rt_put(rt); 635 rt = NULL; 636 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, 637 eiph->daddr, eiph->saddr, 638 0, 0, 639 IPPROTO_IPIP, 640 RT_TOS(eiph->tos), 0); 641 if (IS_ERR(rt) || 642 rt->dst.dev->type != ARPHRD_TUNNEL) { 643 if (!IS_ERR(rt)) 644 ip_rt_put(rt); 645 goto out; 646 } 647 skb_dst_set(skb2, &rt->dst); 648 } else { 649 ip_rt_put(rt); 650 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, 651 skb2->dev) || 652 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) 653 goto out; 654 } 655 656 /* change mtu on this route */ 657 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { 658 if (rel_info > dst_mtu(skb_dst(skb2))) 659 goto out; 660 661 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); 662 } 663 if (rel_type == ICMP_REDIRECT) 664 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); 665 666 icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); 667 668 out: 669 kfree_skb(skb2); 670 return 0; 671 } 672 673 static int 674 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 675 u8 type, u8 code, int offset, __be32 info) 676 { 677 int rel_msg = 0; 678 u8 rel_type = type; 679 u8 rel_code = code; 680 __u32 rel_info = ntohl(info); 681 int err; 682 683 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, 684 &rel_msg, &rel_info, offset); 685 if (err < 0) 686 return err; 687 688 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { 689 struct rt6_info *rt; 690 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 691 692 if (!skb2) 693 return 0; 694 695 skb_dst_drop(skb2); 696 skb_pull(skb2, offset); 697 skb_reset_network_header(skb2); 698 699 /* Try to guess incoming interface */ 700 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, 701 NULL, 0, 0); 702 703 if (rt && rt->dst.dev) 704 skb2->dev = rt->dst.dev; 705 706 icmpv6_send(skb2, rel_type, rel_code, rel_info); 707 708 ip6_rt_put(rt); 709 710 kfree_skb(skb2); 711 } 712 713 return 0; 714 } 715 716 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 717 const struct ipv6hdr *ipv6h, 718 struct sk_buff *skb) 719 { 720 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; 721 722 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 723 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); 724 725 return IP6_ECN_decapsulate(ipv6h, skb); 726 } 727 728 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 729 const struct ipv6hdr *ipv6h, 730 struct sk_buff *skb) 731 { 732 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 733 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); 734 735 return IP6_ECN_decapsulate(ipv6h, skb); 736 } 737 738 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, 739 const struct in6_addr *laddr, 740 const struct in6_addr *raddr) 741 { 742 struct __ip6_tnl_parm *p = &t->parms; 743 int ltype = ipv6_addr_type(laddr); 744 int rtype = ipv6_addr_type(raddr); 745 __u32 flags = 0; 746 747 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { 748 flags = IP6_TNL_F_CAP_PER_PACKET; 749 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 750 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 751 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && 752 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { 753 if (ltype&IPV6_ADDR_UNICAST) 754 flags |= IP6_TNL_F_CAP_XMIT; 755 if (rtype&IPV6_ADDR_UNICAST) 756 flags |= IP6_TNL_F_CAP_RCV; 757 } 758 return flags; 759 } 760 EXPORT_SYMBOL(ip6_tnl_get_cap); 761 762 /* called with rcu_read_lock() */ 763 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, 764 const struct in6_addr *laddr, 765 const struct in6_addr *raddr) 766 { 767 struct __ip6_tnl_parm *p = &t->parms; 768 int ret = 0; 769 struct net *net = t->net; 770 771 if ((p->flags & IP6_TNL_F_CAP_RCV) || 772 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 773 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { 774 struct net_device *ldev = NULL; 775 776 if (p->link) 777 ldev = dev_get_by_index_rcu(net, p->link); 778 779 if ((ipv6_addr_is_multicast(laddr) || 780 likely(ipv6_chk_addr(net, laddr, ldev, 0))) && 781 likely(!ipv6_chk_addr(net, raddr, NULL, 0))) 782 ret = 1; 783 } 784 return ret; 785 } 786 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); 787 788 /** 789 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally 790 * @skb: received socket buffer 791 * @protocol: ethernet protocol ID 792 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN 793 * 794 * Return: 0 795 **/ 796 797 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, 798 __u8 ipproto, 799 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 800 const struct ipv6hdr *ipv6h, 801 struct sk_buff *skb)) 802 { 803 struct ip6_tnl *t; 804 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 805 u8 tproto; 806 int err; 807 808 rcu_read_lock(); 809 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); 810 if (t) { 811 struct pcpu_sw_netstats *tstats; 812 813 tproto = ACCESS_ONCE(t->parms.proto); 814 if (tproto != ipproto && tproto != 0) { 815 rcu_read_unlock(); 816 goto discard; 817 } 818 819 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 820 rcu_read_unlock(); 821 goto discard; 822 } 823 824 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) { 825 t->dev->stats.rx_dropped++; 826 rcu_read_unlock(); 827 goto discard; 828 } 829 skb->mac_header = skb->network_header; 830 skb_reset_network_header(skb); 831 skb->protocol = htons(protocol); 832 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 833 834 __skb_tunnel_rx(skb, t->dev, t->net); 835 836 err = dscp_ecn_decapsulate(t, ipv6h, skb); 837 if (unlikely(err)) { 838 if (log_ecn_error) 839 net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n", 840 &ipv6h->saddr, 841 ipv6_get_dsfield(ipv6h)); 842 if (err > 1) { 843 ++t->dev->stats.rx_frame_errors; 844 ++t->dev->stats.rx_errors; 845 rcu_read_unlock(); 846 goto discard; 847 } 848 } 849 850 tstats = this_cpu_ptr(t->dev->tstats); 851 u64_stats_update_begin(&tstats->syncp); 852 tstats->rx_packets++; 853 tstats->rx_bytes += skb->len; 854 u64_stats_update_end(&tstats->syncp); 855 856 netif_rx(skb); 857 858 rcu_read_unlock(); 859 return 0; 860 } 861 rcu_read_unlock(); 862 return 1; 863 864 discard: 865 kfree_skb(skb); 866 return 0; 867 } 868 869 static int ip4ip6_rcv(struct sk_buff *skb) 870 { 871 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, 872 ip4ip6_dscp_ecn_decapsulate); 873 } 874 875 static int ip6ip6_rcv(struct sk_buff *skb) 876 { 877 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, 878 ip6ip6_dscp_ecn_decapsulate); 879 } 880 881 struct ipv6_tel_txoption { 882 struct ipv6_txoptions ops; 883 __u8 dst_opt[8]; 884 }; 885 886 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) 887 { 888 memset(opt, 0, sizeof(struct ipv6_tel_txoption)); 889 890 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; 891 opt->dst_opt[3] = 1; 892 opt->dst_opt[4] = encap_limit; 893 opt->dst_opt[5] = IPV6_TLV_PADN; 894 opt->dst_opt[6] = 1; 895 896 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; 897 opt->ops.opt_nflen = 8; 898 } 899 900 /** 901 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 902 * @t: the outgoing tunnel device 903 * @hdr: IPv6 header from the incoming packet 904 * 905 * Description: 906 * Avoid trivial tunneling loop by checking that tunnel exit-point 907 * doesn't match source of incoming packet. 908 * 909 * Return: 910 * 1 if conflict, 911 * 0 else 912 **/ 913 914 static inline bool 915 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) 916 { 917 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 918 } 919 920 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, 921 const struct in6_addr *laddr, 922 const struct in6_addr *raddr) 923 { 924 struct __ip6_tnl_parm *p = &t->parms; 925 int ret = 0; 926 struct net *net = t->net; 927 928 if ((p->flags & IP6_TNL_F_CAP_XMIT) || 929 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 930 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { 931 struct net_device *ldev = NULL; 932 933 rcu_read_lock(); 934 if (p->link) 935 ldev = dev_get_by_index_rcu(net, p->link); 936 937 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) 938 pr_warn("%s xmit: Local address not yet configured!\n", 939 p->name); 940 else if (!ipv6_addr_is_multicast(raddr) && 941 unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) 942 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", 943 p->name); 944 else 945 ret = 1; 946 rcu_read_unlock(); 947 } 948 return ret; 949 } 950 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); 951 952 /** 953 * ip6_tnl_xmit2 - encapsulate packet and send 954 * @skb: the outgoing socket buffer 955 * @dev: the outgoing tunnel device 956 * @dsfield: dscp code for outer header 957 * @fl: flow of tunneled packet 958 * @encap_limit: encapsulation limit 959 * @pmtu: Path MTU is stored if packet is too big 960 * 961 * Description: 962 * Build new header and do some sanity checks on the packet before sending 963 * it. 964 * 965 * Return: 966 * 0 on success 967 * -1 fail 968 * %-EMSGSIZE message too big. return mtu in this case. 969 **/ 970 971 static int ip6_tnl_xmit2(struct sk_buff *skb, 972 struct net_device *dev, 973 __u8 dsfield, 974 struct flowi6 *fl6, 975 int encap_limit, 976 __u32 *pmtu) 977 { 978 struct ip6_tnl *t = netdev_priv(dev); 979 struct net *net = t->net; 980 struct net_device_stats *stats = &t->dev->stats; 981 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 982 struct ipv6_tel_txoption opt; 983 struct dst_entry *dst = NULL, *ndst = NULL; 984 struct net_device *tdev; 985 int mtu; 986 unsigned int max_headroom = sizeof(struct ipv6hdr); 987 u8 proto; 988 int err = -1; 989 990 /* NBMA tunnel */ 991 if (ipv6_addr_any(&t->parms.raddr)) { 992 struct in6_addr *addr6; 993 struct neighbour *neigh; 994 int addr_type; 995 996 if (!skb_dst(skb)) 997 goto tx_err_link_failure; 998 999 neigh = dst_neigh_lookup(skb_dst(skb), 1000 &ipv6_hdr(skb)->daddr); 1001 if (!neigh) 1002 goto tx_err_link_failure; 1003 1004 addr6 = (struct in6_addr *)&neigh->primary_key; 1005 addr_type = ipv6_addr_type(addr6); 1006 1007 if (addr_type == IPV6_ADDR_ANY) 1008 addr6 = &ipv6_hdr(skb)->daddr; 1009 1010 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); 1011 neigh_release(neigh); 1012 } else if (!fl6->flowi6_mark) 1013 dst = ip6_tnl_dst_check(t); 1014 1015 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) 1016 goto tx_err_link_failure; 1017 1018 if (!dst) { 1019 ndst = ip6_route_output(net, NULL, fl6); 1020 1021 if (ndst->error) 1022 goto tx_err_link_failure; 1023 ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0); 1024 if (IS_ERR(ndst)) { 1025 err = PTR_ERR(ndst); 1026 ndst = NULL; 1027 goto tx_err_link_failure; 1028 } 1029 dst = ndst; 1030 } 1031 1032 tdev = dst->dev; 1033 1034 if (tdev == dev) { 1035 stats->collisions++; 1036 net_warn_ratelimited("%s: Local routing loop detected!\n", 1037 t->parms.name); 1038 goto tx_err_dst_release; 1039 } 1040 mtu = dst_mtu(dst) - sizeof(*ipv6h); 1041 if (encap_limit >= 0) { 1042 max_headroom += 8; 1043 mtu -= 8; 1044 } 1045 if (mtu < IPV6_MIN_MTU) 1046 mtu = IPV6_MIN_MTU; 1047 if (skb_dst(skb)) 1048 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 1049 if (skb->len > mtu) { 1050 *pmtu = mtu; 1051 err = -EMSGSIZE; 1052 goto tx_err_dst_release; 1053 } 1054 1055 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); 1056 1057 /* 1058 * Okay, now see if we can stuff it in the buffer as-is. 1059 */ 1060 max_headroom += LL_RESERVED_SPACE(tdev); 1061 1062 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1063 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1064 struct sk_buff *new_skb; 1065 1066 new_skb = skb_realloc_headroom(skb, max_headroom); 1067 if (!new_skb) 1068 goto tx_err_dst_release; 1069 1070 if (skb->sk) 1071 skb_set_owner_w(new_skb, skb->sk); 1072 consume_skb(skb); 1073 skb = new_skb; 1074 } 1075 if (fl6->flowi6_mark) { 1076 skb_dst_set(skb, dst); 1077 ndst = NULL; 1078 } else { 1079 skb_dst_set_noref(skb, dst); 1080 } 1081 skb->transport_header = skb->network_header; 1082 1083 proto = fl6->flowi6_proto; 1084 if (encap_limit >= 0) { 1085 init_tel_txopt(&opt, encap_limit); 1086 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); 1087 } 1088 1089 if (likely(!skb->encapsulation)) { 1090 skb_reset_inner_headers(skb); 1091 skb->encapsulation = 1; 1092 } 1093 1094 skb_push(skb, sizeof(struct ipv6hdr)); 1095 skb_reset_network_header(skb); 1096 ipv6h = ipv6_hdr(skb); 1097 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), 1098 ip6_make_flowlabel(net, skb, fl6->flowlabel, false)); 1099 ipv6h->hop_limit = t->parms.hop_limit; 1100 ipv6h->nexthdr = proto; 1101 ipv6h->saddr = fl6->saddr; 1102 ipv6h->daddr = fl6->daddr; 1103 ip6tunnel_xmit(NULL, skb, dev); 1104 if (ndst) 1105 ip6_tnl_dst_store(t, ndst); 1106 return 0; 1107 tx_err_link_failure: 1108 stats->tx_carrier_errors++; 1109 dst_link_failure(skb); 1110 tx_err_dst_release: 1111 dst_release(ndst); 1112 return err; 1113 } 1114 1115 static inline int 1116 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1117 { 1118 struct ip6_tnl *t = netdev_priv(dev); 1119 const struct iphdr *iph = ip_hdr(skb); 1120 int encap_limit = -1; 1121 struct flowi6 fl6; 1122 __u8 dsfield; 1123 __u32 mtu; 1124 u8 tproto; 1125 int err; 1126 1127 tproto = ACCESS_ONCE(t->parms.proto); 1128 if (tproto != IPPROTO_IPIP && tproto != 0) 1129 return -1; 1130 1131 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1132 encap_limit = t->parms.encap_limit; 1133 1134 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1135 fl6.flowi6_proto = IPPROTO_IPIP; 1136 1137 dsfield = ipv4_get_dsfield(iph); 1138 1139 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1140 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) 1141 & IPV6_TCLASS_MASK; 1142 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1143 fl6.flowi6_mark = skb->mark; 1144 1145 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); 1146 if (err != 0) { 1147 /* XXX: send ICMP error even if DF is not set. */ 1148 if (err == -EMSGSIZE) 1149 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 1150 htonl(mtu)); 1151 return -1; 1152 } 1153 1154 return 0; 1155 } 1156 1157 static inline int 1158 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1159 { 1160 struct ip6_tnl *t = netdev_priv(dev); 1161 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 1162 int encap_limit = -1; 1163 __u16 offset; 1164 struct flowi6 fl6; 1165 __u8 dsfield; 1166 __u32 mtu; 1167 u8 tproto; 1168 int err; 1169 1170 tproto = ACCESS_ONCE(t->parms.proto); 1171 if ((tproto != IPPROTO_IPV6 && tproto != 0) || 1172 ip6_tnl_addr_conflict(t, ipv6h)) 1173 return -1; 1174 1175 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 1176 if (offset > 0) { 1177 struct ipv6_tlv_tnl_enc_lim *tel; 1178 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 1179 if (tel->encap_limit == 0) { 1180 icmpv6_send(skb, ICMPV6_PARAMPROB, 1181 ICMPV6_HDR_FIELD, offset + 2); 1182 return -1; 1183 } 1184 encap_limit = tel->encap_limit - 1; 1185 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1186 encap_limit = t->parms.encap_limit; 1187 1188 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1189 fl6.flowi6_proto = IPPROTO_IPV6; 1190 1191 dsfield = ipv6_get_dsfield(ipv6h); 1192 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1193 fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); 1194 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 1195 fl6.flowlabel |= ip6_flowlabel(ipv6h); 1196 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1197 fl6.flowi6_mark = skb->mark; 1198 1199 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu); 1200 if (err != 0) { 1201 if (err == -EMSGSIZE) 1202 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1203 return -1; 1204 } 1205 1206 return 0; 1207 } 1208 1209 static netdev_tx_t 1210 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1211 { 1212 struct ip6_tnl *t = netdev_priv(dev); 1213 struct net_device_stats *stats = &t->dev->stats; 1214 int ret; 1215 1216 switch (skb->protocol) { 1217 case htons(ETH_P_IP): 1218 ret = ip4ip6_tnl_xmit(skb, dev); 1219 break; 1220 case htons(ETH_P_IPV6): 1221 ret = ip6ip6_tnl_xmit(skb, dev); 1222 break; 1223 default: 1224 goto tx_err; 1225 } 1226 1227 if (ret < 0) 1228 goto tx_err; 1229 1230 return NETDEV_TX_OK; 1231 1232 tx_err: 1233 stats->tx_errors++; 1234 stats->tx_dropped++; 1235 kfree_skb(skb); 1236 return NETDEV_TX_OK; 1237 } 1238 1239 static void ip6_tnl_link_config(struct ip6_tnl *t) 1240 { 1241 struct net_device *dev = t->dev; 1242 struct __ip6_tnl_parm *p = &t->parms; 1243 struct flowi6 *fl6 = &t->fl.u.ip6; 1244 1245 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1246 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1247 1248 /* Set up flowi template */ 1249 fl6->saddr = p->laddr; 1250 fl6->daddr = p->raddr; 1251 fl6->flowi6_oif = p->link; 1252 fl6->flowlabel = 0; 1253 1254 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1255 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1256 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1257 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1258 1259 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1260 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1261 1262 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) 1263 dev->flags |= IFF_POINTOPOINT; 1264 else 1265 dev->flags &= ~IFF_POINTOPOINT; 1266 1267 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1268 int strict = (ipv6_addr_type(&p->raddr) & 1269 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1270 1271 struct rt6_info *rt = rt6_lookup(t->net, 1272 &p->raddr, &p->laddr, 1273 p->link, strict); 1274 1275 if (!rt) 1276 return; 1277 1278 if (rt->dst.dev) { 1279 dev->hard_header_len = rt->dst.dev->hard_header_len + 1280 sizeof(struct ipv6hdr); 1281 1282 dev->mtu = rt->dst.dev->mtu - sizeof(struct ipv6hdr); 1283 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1284 dev->mtu -= 8; 1285 1286 if (dev->mtu < IPV6_MIN_MTU) 1287 dev->mtu = IPV6_MIN_MTU; 1288 } 1289 ip6_rt_put(rt); 1290 } 1291 } 1292 1293 /** 1294 * ip6_tnl_change - update the tunnel parameters 1295 * @t: tunnel to be changed 1296 * @p: tunnel configuration parameters 1297 * 1298 * Description: 1299 * ip6_tnl_change() updates the tunnel parameters 1300 **/ 1301 1302 static int 1303 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) 1304 { 1305 t->parms.laddr = p->laddr; 1306 t->parms.raddr = p->raddr; 1307 t->parms.flags = p->flags; 1308 t->parms.hop_limit = p->hop_limit; 1309 t->parms.encap_limit = p->encap_limit; 1310 t->parms.flowinfo = p->flowinfo; 1311 t->parms.link = p->link; 1312 t->parms.proto = p->proto; 1313 ip6_tnl_dst_reset(t); 1314 ip6_tnl_link_config(t); 1315 return 0; 1316 } 1317 1318 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1319 { 1320 struct net *net = t->net; 1321 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1322 int err; 1323 1324 ip6_tnl_unlink(ip6n, t); 1325 synchronize_net(); 1326 err = ip6_tnl_change(t, p); 1327 ip6_tnl_link(ip6n, t); 1328 netdev_state_change(t->dev); 1329 return err; 1330 } 1331 1332 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1333 { 1334 /* for default tnl0 device allow to change only the proto */ 1335 t->parms.proto = p->proto; 1336 netdev_state_change(t->dev); 1337 return 0; 1338 } 1339 1340 static void 1341 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) 1342 { 1343 p->laddr = u->laddr; 1344 p->raddr = u->raddr; 1345 p->flags = u->flags; 1346 p->hop_limit = u->hop_limit; 1347 p->encap_limit = u->encap_limit; 1348 p->flowinfo = u->flowinfo; 1349 p->link = u->link; 1350 p->proto = u->proto; 1351 memcpy(p->name, u->name, sizeof(u->name)); 1352 } 1353 1354 static void 1355 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) 1356 { 1357 u->laddr = p->laddr; 1358 u->raddr = p->raddr; 1359 u->flags = p->flags; 1360 u->hop_limit = p->hop_limit; 1361 u->encap_limit = p->encap_limit; 1362 u->flowinfo = p->flowinfo; 1363 u->link = p->link; 1364 u->proto = p->proto; 1365 memcpy(u->name, p->name, sizeof(u->name)); 1366 } 1367 1368 /** 1369 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace 1370 * @dev: virtual device associated with tunnel 1371 * @ifr: parameters passed from userspace 1372 * @cmd: command to be performed 1373 * 1374 * Description: 1375 * ip6_tnl_ioctl() is used for managing IPv6 tunnels 1376 * from userspace. 1377 * 1378 * The possible commands are the following: 1379 * %SIOCGETTUNNEL: get tunnel parameters for device 1380 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 1381 * %SIOCCHGTUNNEL: change tunnel parameters to those given 1382 * %SIOCDELTUNNEL: delete tunnel 1383 * 1384 * The fallback device "ip6tnl0", created during module 1385 * initialization, can be used for creating other tunnel devices. 1386 * 1387 * Return: 1388 * 0 on success, 1389 * %-EFAULT if unable to copy data to or from userspace, 1390 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 1391 * %-EINVAL if passed tunnel parameters are invalid, 1392 * %-EEXIST if changing a tunnel's parameters would cause a conflict 1393 * %-ENODEV if attempting to change or delete a nonexisting device 1394 **/ 1395 1396 static int 1397 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1398 { 1399 int err = 0; 1400 struct ip6_tnl_parm p; 1401 struct __ip6_tnl_parm p1; 1402 struct ip6_tnl *t = netdev_priv(dev); 1403 struct net *net = t->net; 1404 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1405 1406 switch (cmd) { 1407 case SIOCGETTUNNEL: 1408 if (dev == ip6n->fb_tnl_dev) { 1409 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1410 err = -EFAULT; 1411 break; 1412 } 1413 ip6_tnl_parm_from_user(&p1, &p); 1414 t = ip6_tnl_locate(net, &p1, 0); 1415 if (IS_ERR(t)) 1416 t = netdev_priv(dev); 1417 } else { 1418 memset(&p, 0, sizeof(p)); 1419 } 1420 ip6_tnl_parm_to_user(&p, &t->parms); 1421 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { 1422 err = -EFAULT; 1423 } 1424 break; 1425 case SIOCADDTUNNEL: 1426 case SIOCCHGTUNNEL: 1427 err = -EPERM; 1428 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1429 break; 1430 err = -EFAULT; 1431 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1432 break; 1433 err = -EINVAL; 1434 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 1435 p.proto != 0) 1436 break; 1437 ip6_tnl_parm_from_user(&p1, &p); 1438 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); 1439 if (cmd == SIOCCHGTUNNEL) { 1440 if (!IS_ERR(t)) { 1441 if (t->dev != dev) { 1442 err = -EEXIST; 1443 break; 1444 } 1445 } else 1446 t = netdev_priv(dev); 1447 if (dev == ip6n->fb_tnl_dev) 1448 err = ip6_tnl0_update(t, &p1); 1449 else 1450 err = ip6_tnl_update(t, &p1); 1451 } 1452 if (!IS_ERR(t)) { 1453 err = 0; 1454 ip6_tnl_parm_to_user(&p, &t->parms); 1455 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1456 err = -EFAULT; 1457 1458 } else { 1459 err = PTR_ERR(t); 1460 } 1461 break; 1462 case SIOCDELTUNNEL: 1463 err = -EPERM; 1464 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1465 break; 1466 1467 if (dev == ip6n->fb_tnl_dev) { 1468 err = -EFAULT; 1469 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1470 break; 1471 err = -ENOENT; 1472 ip6_tnl_parm_from_user(&p1, &p); 1473 t = ip6_tnl_locate(net, &p1, 0); 1474 if (IS_ERR(t)) 1475 break; 1476 err = -EPERM; 1477 if (t->dev == ip6n->fb_tnl_dev) 1478 break; 1479 dev = t->dev; 1480 } 1481 err = 0; 1482 unregister_netdevice(dev); 1483 break; 1484 default: 1485 err = -EINVAL; 1486 } 1487 return err; 1488 } 1489 1490 /** 1491 * ip6_tnl_change_mtu - change mtu manually for tunnel device 1492 * @dev: virtual device associated with tunnel 1493 * @new_mtu: the new mtu 1494 * 1495 * Return: 1496 * 0 on success, 1497 * %-EINVAL if mtu too small 1498 **/ 1499 1500 static int 1501 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) 1502 { 1503 struct ip6_tnl *tnl = netdev_priv(dev); 1504 1505 if (tnl->parms.proto == IPPROTO_IPIP) { 1506 if (new_mtu < 68) 1507 return -EINVAL; 1508 } else { 1509 if (new_mtu < IPV6_MIN_MTU) 1510 return -EINVAL; 1511 } 1512 if (new_mtu > 0xFFF8 - dev->hard_header_len) 1513 return -EINVAL; 1514 dev->mtu = new_mtu; 1515 return 0; 1516 } 1517 1518 int ip6_tnl_get_iflink(const struct net_device *dev) 1519 { 1520 struct ip6_tnl *t = netdev_priv(dev); 1521 1522 return t->parms.link; 1523 } 1524 EXPORT_SYMBOL(ip6_tnl_get_iflink); 1525 1526 static const struct net_device_ops ip6_tnl_netdev_ops = { 1527 .ndo_init = ip6_tnl_dev_init, 1528 .ndo_uninit = ip6_tnl_dev_uninit, 1529 .ndo_start_xmit = ip6_tnl_xmit, 1530 .ndo_do_ioctl = ip6_tnl_ioctl, 1531 .ndo_change_mtu = ip6_tnl_change_mtu, 1532 .ndo_get_stats = ip6_get_stats, 1533 .ndo_get_iflink = ip6_tnl_get_iflink, 1534 }; 1535 1536 1537 /** 1538 * ip6_tnl_dev_setup - setup virtual tunnel device 1539 * @dev: virtual device associated with tunnel 1540 * 1541 * Description: 1542 * Initialize function pointers and device parameters 1543 **/ 1544 1545 static void ip6_tnl_dev_setup(struct net_device *dev) 1546 { 1547 struct ip6_tnl *t; 1548 1549 dev->netdev_ops = &ip6_tnl_netdev_ops; 1550 dev->destructor = ip6_dev_free; 1551 1552 dev->type = ARPHRD_TUNNEL6; 1553 dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr); 1554 dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr); 1555 t = netdev_priv(dev); 1556 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1557 dev->mtu -= 8; 1558 dev->flags |= IFF_NOARP; 1559 dev->addr_len = sizeof(struct in6_addr); 1560 netif_keep_dst(dev); 1561 /* This perm addr will be used as interface identifier by IPv6 */ 1562 dev->addr_assign_type = NET_ADDR_RANDOM; 1563 eth_random_addr(dev->perm_addr); 1564 } 1565 1566 1567 /** 1568 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices 1569 * @dev: virtual device associated with tunnel 1570 **/ 1571 1572 static inline int 1573 ip6_tnl_dev_init_gen(struct net_device *dev) 1574 { 1575 struct ip6_tnl *t = netdev_priv(dev); 1576 1577 t->dev = dev; 1578 t->net = dev_net(dev); 1579 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1580 if (!dev->tstats) 1581 return -ENOMEM; 1582 return 0; 1583 } 1584 1585 /** 1586 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices 1587 * @dev: virtual device associated with tunnel 1588 **/ 1589 1590 static int ip6_tnl_dev_init(struct net_device *dev) 1591 { 1592 struct ip6_tnl *t = netdev_priv(dev); 1593 int err = ip6_tnl_dev_init_gen(dev); 1594 1595 if (err) 1596 return err; 1597 ip6_tnl_link_config(t); 1598 return 0; 1599 } 1600 1601 /** 1602 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device 1603 * @dev: fallback device 1604 * 1605 * Return: 0 1606 **/ 1607 1608 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) 1609 { 1610 struct ip6_tnl *t = netdev_priv(dev); 1611 struct net *net = dev_net(dev); 1612 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1613 1614 t->parms.proto = IPPROTO_IPV6; 1615 dev_hold(dev); 1616 1617 rcu_assign_pointer(ip6n->tnls_wc[0], t); 1618 return 0; 1619 } 1620 1621 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) 1622 { 1623 u8 proto; 1624 1625 if (!data || !data[IFLA_IPTUN_PROTO]) 1626 return 0; 1627 1628 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1629 if (proto != IPPROTO_IPV6 && 1630 proto != IPPROTO_IPIP && 1631 proto != 0) 1632 return -EINVAL; 1633 1634 return 0; 1635 } 1636 1637 static void ip6_tnl_netlink_parms(struct nlattr *data[], 1638 struct __ip6_tnl_parm *parms) 1639 { 1640 memset(parms, 0, sizeof(*parms)); 1641 1642 if (!data) 1643 return; 1644 1645 if (data[IFLA_IPTUN_LINK]) 1646 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1647 1648 if (data[IFLA_IPTUN_LOCAL]) 1649 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); 1650 1651 if (data[IFLA_IPTUN_REMOTE]) 1652 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); 1653 1654 if (data[IFLA_IPTUN_TTL]) 1655 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); 1656 1657 if (data[IFLA_IPTUN_ENCAP_LIMIT]) 1658 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); 1659 1660 if (data[IFLA_IPTUN_FLOWINFO]) 1661 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); 1662 1663 if (data[IFLA_IPTUN_FLAGS]) 1664 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); 1665 1666 if (data[IFLA_IPTUN_PROTO]) 1667 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1668 } 1669 1670 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, 1671 struct nlattr *tb[], struct nlattr *data[]) 1672 { 1673 struct net *net = dev_net(dev); 1674 struct ip6_tnl *nt, *t; 1675 1676 nt = netdev_priv(dev); 1677 ip6_tnl_netlink_parms(data, &nt->parms); 1678 1679 t = ip6_tnl_locate(net, &nt->parms, 0); 1680 if (!IS_ERR(t)) 1681 return -EEXIST; 1682 1683 return ip6_tnl_create2(dev); 1684 } 1685 1686 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], 1687 struct nlattr *data[]) 1688 { 1689 struct ip6_tnl *t = netdev_priv(dev); 1690 struct __ip6_tnl_parm p; 1691 struct net *net = t->net; 1692 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1693 1694 if (dev == ip6n->fb_tnl_dev) 1695 return -EINVAL; 1696 1697 ip6_tnl_netlink_parms(data, &p); 1698 1699 t = ip6_tnl_locate(net, &p, 0); 1700 if (!IS_ERR(t)) { 1701 if (t->dev != dev) 1702 return -EEXIST; 1703 } else 1704 t = netdev_priv(dev); 1705 1706 return ip6_tnl_update(t, &p); 1707 } 1708 1709 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) 1710 { 1711 struct net *net = dev_net(dev); 1712 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1713 1714 if (dev != ip6n->fb_tnl_dev) 1715 unregister_netdevice_queue(dev, head); 1716 } 1717 1718 static size_t ip6_tnl_get_size(const struct net_device *dev) 1719 { 1720 return 1721 /* IFLA_IPTUN_LINK */ 1722 nla_total_size(4) + 1723 /* IFLA_IPTUN_LOCAL */ 1724 nla_total_size(sizeof(struct in6_addr)) + 1725 /* IFLA_IPTUN_REMOTE */ 1726 nla_total_size(sizeof(struct in6_addr)) + 1727 /* IFLA_IPTUN_TTL */ 1728 nla_total_size(1) + 1729 /* IFLA_IPTUN_ENCAP_LIMIT */ 1730 nla_total_size(1) + 1731 /* IFLA_IPTUN_FLOWINFO */ 1732 nla_total_size(4) + 1733 /* IFLA_IPTUN_FLAGS */ 1734 nla_total_size(4) + 1735 /* IFLA_IPTUN_PROTO */ 1736 nla_total_size(1) + 1737 0; 1738 } 1739 1740 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) 1741 { 1742 struct ip6_tnl *tunnel = netdev_priv(dev); 1743 struct __ip6_tnl_parm *parm = &tunnel->parms; 1744 1745 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 1746 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || 1747 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || 1748 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || 1749 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || 1750 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || 1751 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || 1752 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) 1753 goto nla_put_failure; 1754 return 0; 1755 1756 nla_put_failure: 1757 return -EMSGSIZE; 1758 } 1759 1760 struct net *ip6_tnl_get_link_net(const struct net_device *dev) 1761 { 1762 struct ip6_tnl *tunnel = netdev_priv(dev); 1763 1764 return tunnel->net; 1765 } 1766 EXPORT_SYMBOL(ip6_tnl_get_link_net); 1767 1768 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { 1769 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 1770 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, 1771 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, 1772 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 1773 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, 1774 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, 1775 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, 1776 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 1777 }; 1778 1779 static struct rtnl_link_ops ip6_link_ops __read_mostly = { 1780 .kind = "ip6tnl", 1781 .maxtype = IFLA_IPTUN_MAX, 1782 .policy = ip6_tnl_policy, 1783 .priv_size = sizeof(struct ip6_tnl), 1784 .setup = ip6_tnl_dev_setup, 1785 .validate = ip6_tnl_validate, 1786 .newlink = ip6_tnl_newlink, 1787 .changelink = ip6_tnl_changelink, 1788 .dellink = ip6_tnl_dellink, 1789 .get_size = ip6_tnl_get_size, 1790 .fill_info = ip6_tnl_fill_info, 1791 .get_link_net = ip6_tnl_get_link_net, 1792 }; 1793 1794 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { 1795 .handler = ip4ip6_rcv, 1796 .err_handler = ip4ip6_err, 1797 .priority = 1, 1798 }; 1799 1800 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { 1801 .handler = ip6ip6_rcv, 1802 .err_handler = ip6ip6_err, 1803 .priority = 1, 1804 }; 1805 1806 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) 1807 { 1808 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1809 struct net_device *dev, *aux; 1810 int h; 1811 struct ip6_tnl *t; 1812 LIST_HEAD(list); 1813 1814 for_each_netdev_safe(net, dev, aux) 1815 if (dev->rtnl_link_ops == &ip6_link_ops) 1816 unregister_netdevice_queue(dev, &list); 1817 1818 for (h = 0; h < HASH_SIZE; h++) { 1819 t = rtnl_dereference(ip6n->tnls_r_l[h]); 1820 while (t) { 1821 /* If dev is in the same netns, it has already 1822 * been added to the list by the previous loop. 1823 */ 1824 if (!net_eq(dev_net(t->dev), net)) 1825 unregister_netdevice_queue(t->dev, &list); 1826 t = rtnl_dereference(t->next); 1827 } 1828 } 1829 1830 unregister_netdevice_many(&list); 1831 } 1832 1833 static int __net_init ip6_tnl_init_net(struct net *net) 1834 { 1835 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1836 struct ip6_tnl *t = NULL; 1837 int err; 1838 1839 ip6n->tnls[0] = ip6n->tnls_wc; 1840 ip6n->tnls[1] = ip6n->tnls_r_l; 1841 1842 err = -ENOMEM; 1843 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", 1844 NET_NAME_UNKNOWN, ip6_tnl_dev_setup); 1845 1846 if (!ip6n->fb_tnl_dev) 1847 goto err_alloc_dev; 1848 dev_net_set(ip6n->fb_tnl_dev, net); 1849 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; 1850 /* FB netdevice is special: we have one, and only one per netns. 1851 * Allowing to move it to another netns is clearly unsafe. 1852 */ 1853 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; 1854 1855 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); 1856 if (err < 0) 1857 goto err_register; 1858 1859 err = register_netdev(ip6n->fb_tnl_dev); 1860 if (err < 0) 1861 goto err_register; 1862 1863 t = netdev_priv(ip6n->fb_tnl_dev); 1864 1865 strcpy(t->parms.name, ip6n->fb_tnl_dev->name); 1866 return 0; 1867 1868 err_register: 1869 ip6_dev_free(ip6n->fb_tnl_dev); 1870 err_alloc_dev: 1871 return err; 1872 } 1873 1874 static void __net_exit ip6_tnl_exit_net(struct net *net) 1875 { 1876 rtnl_lock(); 1877 ip6_tnl_destroy_tunnels(net); 1878 rtnl_unlock(); 1879 } 1880 1881 static struct pernet_operations ip6_tnl_net_ops = { 1882 .init = ip6_tnl_init_net, 1883 .exit = ip6_tnl_exit_net, 1884 .id = &ip6_tnl_net_id, 1885 .size = sizeof(struct ip6_tnl_net), 1886 }; 1887 1888 /** 1889 * ip6_tunnel_init - register protocol and reserve needed resources 1890 * 1891 * Return: 0 on success 1892 **/ 1893 1894 static int __init ip6_tunnel_init(void) 1895 { 1896 int err; 1897 1898 err = register_pernet_device(&ip6_tnl_net_ops); 1899 if (err < 0) 1900 goto out_pernet; 1901 1902 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); 1903 if (err < 0) { 1904 pr_err("%s: can't register ip4ip6\n", __func__); 1905 goto out_ip4ip6; 1906 } 1907 1908 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); 1909 if (err < 0) { 1910 pr_err("%s: can't register ip6ip6\n", __func__); 1911 goto out_ip6ip6; 1912 } 1913 err = rtnl_link_register(&ip6_link_ops); 1914 if (err < 0) 1915 goto rtnl_link_failed; 1916 1917 return 0; 1918 1919 rtnl_link_failed: 1920 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); 1921 out_ip6ip6: 1922 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); 1923 out_ip4ip6: 1924 unregister_pernet_device(&ip6_tnl_net_ops); 1925 out_pernet: 1926 return err; 1927 } 1928 1929 /** 1930 * ip6_tunnel_cleanup - free resources and unregister protocol 1931 **/ 1932 1933 static void __exit ip6_tunnel_cleanup(void) 1934 { 1935 rtnl_link_unregister(&ip6_link_ops); 1936 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) 1937 pr_info("%s: can't deregister ip4ip6\n", __func__); 1938 1939 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) 1940 pr_info("%s: can't deregister ip6ip6\n", __func__); 1941 1942 unregister_pernet_device(&ip6_tnl_net_ops); 1943 } 1944 1945 module_init(ip6_tunnel_init); 1946 module_exit(ip6_tunnel_cleanup); 1947