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 <linux/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 #include <net/dst_metadata.h> 61 62 MODULE_AUTHOR("Ville Nuorvala"); 63 MODULE_DESCRIPTION("IPv6 tunneling device"); 64 MODULE_LICENSE("GPL"); 65 MODULE_ALIAS_RTNL_LINK("ip6tnl"); 66 MODULE_ALIAS_NETDEV("ip6tnl0"); 67 68 #define IP6_TUNNEL_HASH_SIZE_SHIFT 5 69 #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT) 70 71 static bool log_ecn_error = true; 72 module_param(log_ecn_error, bool, 0644); 73 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 74 75 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) 76 { 77 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); 78 79 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT); 80 } 81 82 static int ip6_tnl_dev_init(struct net_device *dev); 83 static void ip6_tnl_dev_setup(struct net_device *dev); 84 static struct rtnl_link_ops ip6_link_ops __read_mostly; 85 86 static unsigned int ip6_tnl_net_id __read_mostly; 87 struct ip6_tnl_net { 88 /* the IPv6 tunnel fallback device */ 89 struct net_device *fb_tnl_dev; 90 /* lists for storing tunnels in use */ 91 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE]; 92 struct ip6_tnl __rcu *tnls_wc[1]; 93 struct ip6_tnl __rcu **tnls[2]; 94 struct ip6_tnl __rcu *collect_md_tun; 95 }; 96 97 static struct net_device_stats *ip6_get_stats(struct net_device *dev) 98 { 99 struct pcpu_sw_netstats tmp, sum = { 0 }; 100 int i; 101 102 for_each_possible_cpu(i) { 103 unsigned int start; 104 const struct pcpu_sw_netstats *tstats = 105 per_cpu_ptr(dev->tstats, i); 106 107 do { 108 start = u64_stats_fetch_begin_irq(&tstats->syncp); 109 tmp.rx_packets = tstats->rx_packets; 110 tmp.rx_bytes = tstats->rx_bytes; 111 tmp.tx_packets = tstats->tx_packets; 112 tmp.tx_bytes = tstats->tx_bytes; 113 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); 114 115 sum.rx_packets += tmp.rx_packets; 116 sum.rx_bytes += tmp.rx_bytes; 117 sum.tx_packets += tmp.tx_packets; 118 sum.tx_bytes += tmp.tx_bytes; 119 } 120 dev->stats.rx_packets = sum.rx_packets; 121 dev->stats.rx_bytes = sum.rx_bytes; 122 dev->stats.tx_packets = sum.tx_packets; 123 dev->stats.tx_bytes = sum.tx_bytes; 124 return &dev->stats; 125 } 126 127 /** 128 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses 129 * @remote: the address of the tunnel exit-point 130 * @local: the address of the tunnel entry-point 131 * 132 * Return: 133 * tunnel matching given end-points if found, 134 * else fallback tunnel if its device is up, 135 * else %NULL 136 **/ 137 138 #define for_each_ip6_tunnel_rcu(start) \ 139 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) 140 141 static struct ip6_tnl * 142 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) 143 { 144 unsigned int hash = HASH(remote, local); 145 struct ip6_tnl *t; 146 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 147 struct in6_addr any; 148 149 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 150 if (ipv6_addr_equal(local, &t->parms.laddr) && 151 ipv6_addr_equal(remote, &t->parms.raddr) && 152 (t->dev->flags & IFF_UP)) 153 return t; 154 } 155 156 memset(&any, 0, sizeof(any)); 157 hash = HASH(&any, local); 158 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 159 if (ipv6_addr_equal(local, &t->parms.laddr) && 160 ipv6_addr_any(&t->parms.raddr) && 161 (t->dev->flags & IFF_UP)) 162 return t; 163 } 164 165 hash = HASH(remote, &any); 166 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 167 if (ipv6_addr_equal(remote, &t->parms.raddr) && 168 ipv6_addr_any(&t->parms.laddr) && 169 (t->dev->flags & IFF_UP)) 170 return t; 171 } 172 173 t = rcu_dereference(ip6n->collect_md_tun); 174 if (t) 175 return t; 176 177 t = rcu_dereference(ip6n->tnls_wc[0]); 178 if (t && (t->dev->flags & IFF_UP)) 179 return t; 180 181 return NULL; 182 } 183 184 /** 185 * ip6_tnl_bucket - get head of list matching given tunnel parameters 186 * @p: parameters containing tunnel end-points 187 * 188 * Description: 189 * ip6_tnl_bucket() returns the head of the list matching the 190 * &struct in6_addr entries laddr and raddr in @p. 191 * 192 * Return: head of IPv6 tunnel list 193 **/ 194 195 static struct ip6_tnl __rcu ** 196 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) 197 { 198 const struct in6_addr *remote = &p->raddr; 199 const struct in6_addr *local = &p->laddr; 200 unsigned int h = 0; 201 int prio = 0; 202 203 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { 204 prio = 1; 205 h = HASH(remote, local); 206 } 207 return &ip6n->tnls[prio][h]; 208 } 209 210 /** 211 * ip6_tnl_link - add tunnel to hash table 212 * @t: tunnel to be added 213 **/ 214 215 static void 216 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 217 { 218 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); 219 220 if (t->parms.collect_md) 221 rcu_assign_pointer(ip6n->collect_md_tun, t); 222 rcu_assign_pointer(t->next , rtnl_dereference(*tp)); 223 rcu_assign_pointer(*tp, t); 224 } 225 226 /** 227 * ip6_tnl_unlink - remove tunnel from hash table 228 * @t: tunnel to be removed 229 **/ 230 231 static void 232 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 233 { 234 struct ip6_tnl __rcu **tp; 235 struct ip6_tnl *iter; 236 237 if (t->parms.collect_md) 238 rcu_assign_pointer(ip6n->collect_md_tun, NULL); 239 240 for (tp = ip6_tnl_bucket(ip6n, &t->parms); 241 (iter = rtnl_dereference(*tp)) != NULL; 242 tp = &iter->next) { 243 if (t == iter) { 244 rcu_assign_pointer(*tp, t->next); 245 break; 246 } 247 } 248 } 249 250 static void ip6_dev_free(struct net_device *dev) 251 { 252 struct ip6_tnl *t = netdev_priv(dev); 253 254 gro_cells_destroy(&t->gro_cells); 255 dst_cache_destroy(&t->dst_cache); 256 free_percpu(dev->tstats); 257 free_netdev(dev); 258 } 259 260 static int ip6_tnl_create2(struct net_device *dev) 261 { 262 struct ip6_tnl *t = netdev_priv(dev); 263 struct net *net = dev_net(dev); 264 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 265 int err; 266 267 t = netdev_priv(dev); 268 269 dev->rtnl_link_ops = &ip6_link_ops; 270 err = register_netdevice(dev); 271 if (err < 0) 272 goto out; 273 274 strcpy(t->parms.name, dev->name); 275 276 dev_hold(dev); 277 ip6_tnl_link(ip6n, t); 278 return 0; 279 280 out: 281 return err; 282 } 283 284 /** 285 * ip6_tnl_create - create a new tunnel 286 * @p: tunnel parameters 287 * @pt: pointer to new tunnel 288 * 289 * Description: 290 * Create tunnel matching given parameters. 291 * 292 * Return: 293 * created tunnel or error pointer 294 **/ 295 296 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) 297 { 298 struct net_device *dev; 299 struct ip6_tnl *t; 300 char name[IFNAMSIZ]; 301 int err = -ENOMEM; 302 303 if (p->name[0]) 304 strlcpy(name, p->name, IFNAMSIZ); 305 else 306 sprintf(name, "ip6tnl%%d"); 307 308 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 309 ip6_tnl_dev_setup); 310 if (!dev) 311 goto failed; 312 313 dev_net_set(dev, net); 314 315 t = netdev_priv(dev); 316 t->parms = *p; 317 t->net = dev_net(dev); 318 err = ip6_tnl_create2(dev); 319 if (err < 0) 320 goto failed_free; 321 322 return t; 323 324 failed_free: 325 ip6_dev_free(dev); 326 failed: 327 return ERR_PTR(err); 328 } 329 330 /** 331 * ip6_tnl_locate - find or create tunnel matching given parameters 332 * @p: tunnel parameters 333 * @create: != 0 if allowed to create new tunnel if no match found 334 * 335 * Description: 336 * ip6_tnl_locate() first tries to locate an existing tunnel 337 * based on @parms. If this is unsuccessful, but @create is set a new 338 * tunnel device is created and registered for use. 339 * 340 * Return: 341 * matching tunnel or error pointer 342 **/ 343 344 static struct ip6_tnl *ip6_tnl_locate(struct net *net, 345 struct __ip6_tnl_parm *p, int create) 346 { 347 const struct in6_addr *remote = &p->raddr; 348 const struct in6_addr *local = &p->laddr; 349 struct ip6_tnl __rcu **tp; 350 struct ip6_tnl *t; 351 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 352 353 for (tp = ip6_tnl_bucket(ip6n, p); 354 (t = rtnl_dereference(*tp)) != NULL; 355 tp = &t->next) { 356 if (ipv6_addr_equal(local, &t->parms.laddr) && 357 ipv6_addr_equal(remote, &t->parms.raddr)) { 358 if (create) 359 return ERR_PTR(-EEXIST); 360 361 return t; 362 } 363 } 364 if (!create) 365 return ERR_PTR(-ENODEV); 366 return ip6_tnl_create(net, p); 367 } 368 369 /** 370 * ip6_tnl_dev_uninit - tunnel device uninitializer 371 * @dev: the device to be destroyed 372 * 373 * Description: 374 * ip6_tnl_dev_uninit() removes tunnel from its list 375 **/ 376 377 static void 378 ip6_tnl_dev_uninit(struct net_device *dev) 379 { 380 struct ip6_tnl *t = netdev_priv(dev); 381 struct net *net = t->net; 382 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 383 384 if (dev == ip6n->fb_tnl_dev) 385 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); 386 else 387 ip6_tnl_unlink(ip6n, t); 388 dst_cache_reset(&t->dst_cache); 389 dev_put(dev); 390 } 391 392 /** 393 * parse_tvl_tnl_enc_lim - handle encapsulation limit option 394 * @skb: received socket buffer 395 * 396 * Return: 397 * 0 if none was found, 398 * else index to encapsulation limit 399 **/ 400 401 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) 402 { 403 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw; 404 unsigned int nhoff = raw - skb->data; 405 unsigned int off = nhoff + sizeof(*ipv6h); 406 u8 next, nexthdr = ipv6h->nexthdr; 407 408 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { 409 struct ipv6_opt_hdr *hdr; 410 u16 optlen; 411 412 if (!pskb_may_pull(skb, off + sizeof(*hdr))) 413 break; 414 415 hdr = (struct ipv6_opt_hdr *)(skb->data + off); 416 if (nexthdr == NEXTHDR_FRAGMENT) { 417 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; 418 if (frag_hdr->frag_off) 419 break; 420 optlen = 8; 421 } else if (nexthdr == NEXTHDR_AUTH) { 422 optlen = (hdr->hdrlen + 2) << 2; 423 } else { 424 optlen = ipv6_optlen(hdr); 425 } 426 /* cache hdr->nexthdr, since pskb_may_pull() might 427 * invalidate hdr 428 */ 429 next = hdr->nexthdr; 430 if (nexthdr == NEXTHDR_DEST) { 431 u16 i = 2; 432 433 /* Remember : hdr is no longer valid at this point. */ 434 if (!pskb_may_pull(skb, off + optlen)) 435 break; 436 437 while (1) { 438 struct ipv6_tlv_tnl_enc_lim *tel; 439 440 /* No more room for encapsulation limit */ 441 if (i + sizeof(*tel) > optlen) 442 break; 443 444 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i); 445 /* return index of option if found and valid */ 446 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && 447 tel->length == 1) 448 return i + off - nhoff; 449 /* else jump to next option */ 450 if (tel->type) 451 i += tel->length + 2; 452 else 453 i++; 454 } 455 } 456 nexthdr = next; 457 off += optlen; 458 } 459 return 0; 460 } 461 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); 462 463 /** 464 * ip6_tnl_err - tunnel error handler 465 * 466 * Description: 467 * ip6_tnl_err() should handle errors in the tunnel according 468 * to the specifications in RFC 2473. 469 **/ 470 471 static int 472 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, 473 u8 *type, u8 *code, int *msg, __u32 *info, int offset) 474 { 475 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; 476 struct ip6_tnl *t; 477 int rel_msg = 0; 478 u8 rel_type = ICMPV6_DEST_UNREACH; 479 u8 rel_code = ICMPV6_ADDR_UNREACH; 480 u8 tproto; 481 __u32 rel_info = 0; 482 __u16 len; 483 int err = -ENOENT; 484 485 /* If the packet doesn't contain the original IPv6 header we are 486 in trouble since we might need the source address for further 487 processing of the error. */ 488 489 rcu_read_lock(); 490 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); 491 if (!t) 492 goto out; 493 494 tproto = ACCESS_ONCE(t->parms.proto); 495 if (tproto != ipproto && tproto != 0) 496 goto out; 497 498 err = 0; 499 500 switch (*type) { 501 __u32 teli; 502 struct ipv6_tlv_tnl_enc_lim *tel; 503 __u32 mtu; 504 case ICMPV6_DEST_UNREACH: 505 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 506 t->parms.name); 507 rel_msg = 1; 508 break; 509 case ICMPV6_TIME_EXCEED: 510 if ((*code) == ICMPV6_EXC_HOPLIMIT) { 511 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 512 t->parms.name); 513 rel_msg = 1; 514 } 515 break; 516 case ICMPV6_PARAMPROB: 517 teli = 0; 518 if ((*code) == ICMPV6_HDR_FIELD) 519 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 520 521 if (teli && teli == *info - 2) { 522 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 523 if (tel->encap_limit == 0) { 524 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 525 t->parms.name); 526 rel_msg = 1; 527 } 528 } else { 529 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 530 t->parms.name); 531 } 532 break; 533 case ICMPV6_PKT_TOOBIG: 534 mtu = *info - offset; 535 if (mtu < IPV6_MIN_MTU) 536 mtu = IPV6_MIN_MTU; 537 t->dev->mtu = mtu; 538 539 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); 540 if (len > mtu) { 541 rel_type = ICMPV6_PKT_TOOBIG; 542 rel_code = 0; 543 rel_info = mtu; 544 rel_msg = 1; 545 } 546 break; 547 } 548 549 *type = rel_type; 550 *code = rel_code; 551 *info = rel_info; 552 *msg = rel_msg; 553 554 out: 555 rcu_read_unlock(); 556 return err; 557 } 558 559 static int 560 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 561 u8 type, u8 code, int offset, __be32 info) 562 { 563 int rel_msg = 0; 564 u8 rel_type = type; 565 u8 rel_code = code; 566 __u32 rel_info = ntohl(info); 567 int err; 568 struct sk_buff *skb2; 569 const struct iphdr *eiph; 570 struct rtable *rt; 571 struct flowi4 fl4; 572 573 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, 574 &rel_msg, &rel_info, offset); 575 if (err < 0) 576 return err; 577 578 if (rel_msg == 0) 579 return 0; 580 581 switch (rel_type) { 582 case ICMPV6_DEST_UNREACH: 583 if (rel_code != ICMPV6_ADDR_UNREACH) 584 return 0; 585 rel_type = ICMP_DEST_UNREACH; 586 rel_code = ICMP_HOST_UNREACH; 587 break; 588 case ICMPV6_PKT_TOOBIG: 589 if (rel_code != 0) 590 return 0; 591 rel_type = ICMP_DEST_UNREACH; 592 rel_code = ICMP_FRAG_NEEDED; 593 break; 594 case NDISC_REDIRECT: 595 rel_type = ICMP_REDIRECT; 596 rel_code = ICMP_REDIR_HOST; 597 default: 598 return 0; 599 } 600 601 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) 602 return 0; 603 604 skb2 = skb_clone(skb, GFP_ATOMIC); 605 if (!skb2) 606 return 0; 607 608 skb_dst_drop(skb2); 609 610 skb_pull(skb2, offset); 611 skb_reset_network_header(skb2); 612 eiph = ip_hdr(skb2); 613 614 /* Try to guess incoming interface */ 615 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, 616 eiph->saddr, 0, 617 0, 0, 618 IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 619 if (IS_ERR(rt)) 620 goto out; 621 622 skb2->dev = rt->dst.dev; 623 624 /* route "incoming" packet */ 625 if (rt->rt_flags & RTCF_LOCAL) { 626 ip_rt_put(rt); 627 rt = NULL; 628 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, 629 eiph->daddr, eiph->saddr, 630 0, 0, 631 IPPROTO_IPIP, 632 RT_TOS(eiph->tos), 0); 633 if (IS_ERR(rt) || 634 rt->dst.dev->type != ARPHRD_TUNNEL) { 635 if (!IS_ERR(rt)) 636 ip_rt_put(rt); 637 goto out; 638 } 639 skb_dst_set(skb2, &rt->dst); 640 } else { 641 ip_rt_put(rt); 642 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, 643 skb2->dev) || 644 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) 645 goto out; 646 } 647 648 /* change mtu on this route */ 649 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { 650 if (rel_info > dst_mtu(skb_dst(skb2))) 651 goto out; 652 653 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); 654 } 655 if (rel_type == ICMP_REDIRECT) 656 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); 657 658 icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); 659 660 out: 661 kfree_skb(skb2); 662 return 0; 663 } 664 665 static int 666 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 667 u8 type, u8 code, int offset, __be32 info) 668 { 669 int rel_msg = 0; 670 u8 rel_type = type; 671 u8 rel_code = code; 672 __u32 rel_info = ntohl(info); 673 int err; 674 675 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, 676 &rel_msg, &rel_info, offset); 677 if (err < 0) 678 return err; 679 680 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { 681 struct rt6_info *rt; 682 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 683 684 if (!skb2) 685 return 0; 686 687 skb_dst_drop(skb2); 688 skb_pull(skb2, offset); 689 skb_reset_network_header(skb2); 690 691 /* Try to guess incoming interface */ 692 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, 693 NULL, 0, 0); 694 695 if (rt && rt->dst.dev) 696 skb2->dev = rt->dst.dev; 697 698 icmpv6_send(skb2, rel_type, rel_code, rel_info); 699 700 ip6_rt_put(rt); 701 702 kfree_skb(skb2); 703 } 704 705 return 0; 706 } 707 708 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 709 const struct ipv6hdr *ipv6h, 710 struct sk_buff *skb) 711 { 712 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; 713 714 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 715 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); 716 717 return IP6_ECN_decapsulate(ipv6h, skb); 718 } 719 720 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 721 const struct ipv6hdr *ipv6h, 722 struct sk_buff *skb) 723 { 724 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 725 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); 726 727 return IP6_ECN_decapsulate(ipv6h, skb); 728 } 729 730 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, 731 const struct in6_addr *laddr, 732 const struct in6_addr *raddr) 733 { 734 struct __ip6_tnl_parm *p = &t->parms; 735 int ltype = ipv6_addr_type(laddr); 736 int rtype = ipv6_addr_type(raddr); 737 __u32 flags = 0; 738 739 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { 740 flags = IP6_TNL_F_CAP_PER_PACKET; 741 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 742 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 743 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && 744 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { 745 if (ltype&IPV6_ADDR_UNICAST) 746 flags |= IP6_TNL_F_CAP_XMIT; 747 if (rtype&IPV6_ADDR_UNICAST) 748 flags |= IP6_TNL_F_CAP_RCV; 749 } 750 return flags; 751 } 752 EXPORT_SYMBOL(ip6_tnl_get_cap); 753 754 /* called with rcu_read_lock() */ 755 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, 756 const struct in6_addr *laddr, 757 const struct in6_addr *raddr) 758 { 759 struct __ip6_tnl_parm *p = &t->parms; 760 int ret = 0; 761 struct net *net = t->net; 762 763 if ((p->flags & IP6_TNL_F_CAP_RCV) || 764 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 765 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { 766 struct net_device *ldev = NULL; 767 768 if (p->link) 769 ldev = dev_get_by_index_rcu(net, p->link); 770 771 if ((ipv6_addr_is_multicast(laddr) || 772 likely(ipv6_chk_addr(net, laddr, ldev, 0))) && 773 likely(!ipv6_chk_addr(net, raddr, NULL, 0))) 774 ret = 1; 775 } 776 return ret; 777 } 778 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); 779 780 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 781 const struct tnl_ptk_info *tpi, 782 struct metadata_dst *tun_dst, 783 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 784 const struct ipv6hdr *ipv6h, 785 struct sk_buff *skb), 786 bool log_ecn_err) 787 { 788 struct pcpu_sw_netstats *tstats; 789 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 790 int err; 791 792 if ((!(tpi->flags & TUNNEL_CSUM) && 793 (tunnel->parms.i_flags & TUNNEL_CSUM)) || 794 ((tpi->flags & TUNNEL_CSUM) && 795 !(tunnel->parms.i_flags & TUNNEL_CSUM))) { 796 tunnel->dev->stats.rx_crc_errors++; 797 tunnel->dev->stats.rx_errors++; 798 goto drop; 799 } 800 801 if (tunnel->parms.i_flags & TUNNEL_SEQ) { 802 if (!(tpi->flags & TUNNEL_SEQ) || 803 (tunnel->i_seqno && 804 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { 805 tunnel->dev->stats.rx_fifo_errors++; 806 tunnel->dev->stats.rx_errors++; 807 goto drop; 808 } 809 tunnel->i_seqno = ntohl(tpi->seq) + 1; 810 } 811 812 skb->protocol = tpi->proto; 813 814 /* Warning: All skb pointers will be invalidated! */ 815 if (tunnel->dev->type == ARPHRD_ETHER) { 816 if (!pskb_may_pull(skb, ETH_HLEN)) { 817 tunnel->dev->stats.rx_length_errors++; 818 tunnel->dev->stats.rx_errors++; 819 goto drop; 820 } 821 822 ipv6h = ipv6_hdr(skb); 823 skb->protocol = eth_type_trans(skb, tunnel->dev); 824 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 825 } else { 826 skb->dev = tunnel->dev; 827 } 828 829 skb_reset_network_header(skb); 830 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 831 832 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); 833 834 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); 835 if (unlikely(err)) { 836 if (log_ecn_err) 837 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", 838 &ipv6h->saddr, 839 ipv6_get_dsfield(ipv6h)); 840 if (err > 1) { 841 ++tunnel->dev->stats.rx_frame_errors; 842 ++tunnel->dev->stats.rx_errors; 843 goto drop; 844 } 845 } 846 847 tstats = this_cpu_ptr(tunnel->dev->tstats); 848 u64_stats_update_begin(&tstats->syncp); 849 tstats->rx_packets++; 850 tstats->rx_bytes += skb->len; 851 u64_stats_update_end(&tstats->syncp); 852 853 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); 854 855 if (tun_dst) 856 skb_dst_set(skb, (struct dst_entry *)tun_dst); 857 858 gro_cells_receive(&tunnel->gro_cells, skb); 859 return 0; 860 861 drop: 862 kfree_skb(skb); 863 return 0; 864 } 865 866 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, 867 const struct tnl_ptk_info *tpi, 868 struct metadata_dst *tun_dst, 869 bool log_ecn_err) 870 { 871 return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate, 872 log_ecn_err); 873 } 874 EXPORT_SYMBOL(ip6_tnl_rcv); 875 876 static const struct tnl_ptk_info tpi_v6 = { 877 /* no tunnel info required for ipxip6. */ 878 .proto = htons(ETH_P_IPV6), 879 }; 880 881 static const struct tnl_ptk_info tpi_v4 = { 882 /* no tunnel info required for ipxip6. */ 883 .proto = htons(ETH_P_IP), 884 }; 885 886 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, 887 const struct tnl_ptk_info *tpi, 888 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 889 const struct ipv6hdr *ipv6h, 890 struct sk_buff *skb)) 891 { 892 struct ip6_tnl *t; 893 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 894 struct metadata_dst *tun_dst = NULL; 895 int ret = -1; 896 897 rcu_read_lock(); 898 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); 899 900 if (t) { 901 u8 tproto = ACCESS_ONCE(t->parms.proto); 902 903 if (tproto != ipproto && tproto != 0) 904 goto drop; 905 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 906 goto drop; 907 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) 908 goto drop; 909 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 910 goto drop; 911 if (t->parms.collect_md) { 912 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0); 913 if (!tun_dst) 914 return 0; 915 } 916 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, 917 log_ecn_error); 918 } 919 920 rcu_read_unlock(); 921 922 return ret; 923 924 drop: 925 rcu_read_unlock(); 926 kfree_skb(skb); 927 return 0; 928 } 929 930 static int ip4ip6_rcv(struct sk_buff *skb) 931 { 932 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4, 933 ip4ip6_dscp_ecn_decapsulate); 934 } 935 936 static int ip6ip6_rcv(struct sk_buff *skb) 937 { 938 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, 939 ip6ip6_dscp_ecn_decapsulate); 940 } 941 942 struct ipv6_tel_txoption { 943 struct ipv6_txoptions ops; 944 __u8 dst_opt[8]; 945 }; 946 947 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) 948 { 949 memset(opt, 0, sizeof(struct ipv6_tel_txoption)); 950 951 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; 952 opt->dst_opt[3] = 1; 953 opt->dst_opt[4] = encap_limit; 954 opt->dst_opt[5] = IPV6_TLV_PADN; 955 opt->dst_opt[6] = 1; 956 957 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; 958 opt->ops.opt_nflen = 8; 959 } 960 961 /** 962 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 963 * @t: the outgoing tunnel device 964 * @hdr: IPv6 header from the incoming packet 965 * 966 * Description: 967 * Avoid trivial tunneling loop by checking that tunnel exit-point 968 * doesn't match source of incoming packet. 969 * 970 * Return: 971 * 1 if conflict, 972 * 0 else 973 **/ 974 975 static inline bool 976 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) 977 { 978 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 979 } 980 981 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, 982 const struct in6_addr *laddr, 983 const struct in6_addr *raddr) 984 { 985 struct __ip6_tnl_parm *p = &t->parms; 986 int ret = 0; 987 struct net *net = t->net; 988 989 if ((p->flags & IP6_TNL_F_CAP_XMIT) || 990 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 991 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { 992 struct net_device *ldev = NULL; 993 994 rcu_read_lock(); 995 if (p->link) 996 ldev = dev_get_by_index_rcu(net, p->link); 997 998 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) 999 pr_warn("%s xmit: Local address not yet configured!\n", 1000 p->name); 1001 else if (!ipv6_addr_is_multicast(raddr) && 1002 unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) 1003 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", 1004 p->name); 1005 else 1006 ret = 1; 1007 rcu_read_unlock(); 1008 } 1009 return ret; 1010 } 1011 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); 1012 1013 /** 1014 * ip6_tnl_xmit - encapsulate packet and send 1015 * @skb: the outgoing socket buffer 1016 * @dev: the outgoing tunnel device 1017 * @dsfield: dscp code for outer header 1018 * @fl6: flow of tunneled packet 1019 * @encap_limit: encapsulation limit 1020 * @pmtu: Path MTU is stored if packet is too big 1021 * @proto: next header value 1022 * 1023 * Description: 1024 * Build new header and do some sanity checks on the packet before sending 1025 * it. 1026 * 1027 * Return: 1028 * 0 on success 1029 * -1 fail 1030 * %-EMSGSIZE message too big. return mtu in this case. 1031 **/ 1032 1033 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 1034 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, 1035 __u8 proto) 1036 { 1037 struct ip6_tnl *t = netdev_priv(dev); 1038 struct net *net = t->net; 1039 struct net_device_stats *stats = &t->dev->stats; 1040 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 1041 struct ipv6_tel_txoption opt; 1042 struct dst_entry *dst = NULL, *ndst = NULL; 1043 struct net_device *tdev; 1044 int mtu; 1045 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; 1046 unsigned int max_headroom = psh_hlen; 1047 bool use_cache = false; 1048 u8 hop_limit; 1049 int err = -1; 1050 1051 if (t->parms.collect_md) { 1052 hop_limit = skb_tunnel_info(skb)->key.ttl; 1053 goto route_lookup; 1054 } else { 1055 hop_limit = t->parms.hop_limit; 1056 } 1057 1058 /* NBMA tunnel */ 1059 if (ipv6_addr_any(&t->parms.raddr)) { 1060 struct in6_addr *addr6; 1061 struct neighbour *neigh; 1062 int addr_type; 1063 1064 if (!skb_dst(skb)) 1065 goto tx_err_link_failure; 1066 1067 neigh = dst_neigh_lookup(skb_dst(skb), 1068 &ipv6_hdr(skb)->daddr); 1069 if (!neigh) 1070 goto tx_err_link_failure; 1071 1072 addr6 = (struct in6_addr *)&neigh->primary_key; 1073 addr_type = ipv6_addr_type(addr6); 1074 1075 if (addr_type == IPV6_ADDR_ANY) 1076 addr6 = &ipv6_hdr(skb)->daddr; 1077 1078 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); 1079 neigh_release(neigh); 1080 } else if (!(t->parms.flags & 1081 (IP6_TNL_F_USE_ORIG_TCLASS | IP6_TNL_F_USE_ORIG_FWMARK))) { 1082 /* enable the cache only only if the routing decision does 1083 * not depend on the current inner header value 1084 */ 1085 use_cache = true; 1086 } 1087 1088 if (use_cache) 1089 dst = dst_cache_get(&t->dst_cache); 1090 1091 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) 1092 goto tx_err_link_failure; 1093 1094 if (!dst) { 1095 route_lookup: 1096 dst = ip6_route_output(net, NULL, fl6); 1097 1098 if (dst->error) 1099 goto tx_err_link_failure; 1100 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); 1101 if (IS_ERR(dst)) { 1102 err = PTR_ERR(dst); 1103 dst = NULL; 1104 goto tx_err_link_failure; 1105 } 1106 if (t->parms.collect_md && 1107 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, 1108 &fl6->daddr, 0, &fl6->saddr)) 1109 goto tx_err_link_failure; 1110 ndst = dst; 1111 } 1112 1113 tdev = dst->dev; 1114 1115 if (tdev == dev) { 1116 stats->collisions++; 1117 net_warn_ratelimited("%s: Local routing loop detected!\n", 1118 t->parms.name); 1119 goto tx_err_dst_release; 1120 } 1121 mtu = dst_mtu(dst) - psh_hlen - t->tun_hlen; 1122 if (encap_limit >= 0) { 1123 max_headroom += 8; 1124 mtu -= 8; 1125 } 1126 if (mtu < IPV6_MIN_MTU) 1127 mtu = IPV6_MIN_MTU; 1128 if (skb_dst(skb) && !t->parms.collect_md) 1129 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 1130 if (skb->len - t->tun_hlen > mtu && !skb_is_gso(skb)) { 1131 *pmtu = mtu; 1132 err = -EMSGSIZE; 1133 goto tx_err_dst_release; 1134 } 1135 1136 if (t->err_count > 0) { 1137 if (time_before(jiffies, 1138 t->err_time + IP6TUNNEL_ERR_TIMEO)) { 1139 t->err_count--; 1140 1141 dst_link_failure(skb); 1142 } else { 1143 t->err_count = 0; 1144 } 1145 } 1146 1147 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); 1148 1149 /* 1150 * Okay, now see if we can stuff it in the buffer as-is. 1151 */ 1152 max_headroom += LL_RESERVED_SPACE(tdev); 1153 1154 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1155 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1156 struct sk_buff *new_skb; 1157 1158 new_skb = skb_realloc_headroom(skb, max_headroom); 1159 if (!new_skb) 1160 goto tx_err_dst_release; 1161 1162 if (skb->sk) 1163 skb_set_owner_w(new_skb, skb->sk); 1164 consume_skb(skb); 1165 skb = new_skb; 1166 } 1167 1168 if (t->parms.collect_md) { 1169 if (t->encap.type != TUNNEL_ENCAP_NONE) 1170 goto tx_err_dst_release; 1171 } else { 1172 if (use_cache && ndst) 1173 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); 1174 } 1175 skb_dst_set(skb, dst); 1176 1177 if (encap_limit >= 0) { 1178 init_tel_txopt(&opt, encap_limit); 1179 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL, NULL); 1180 } 1181 1182 /* Calculate max headroom for all the headers and adjust 1183 * needed_headroom if necessary. 1184 */ 1185 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) 1186 + dst->header_len + t->hlen; 1187 if (max_headroom > dev->needed_headroom) 1188 dev->needed_headroom = max_headroom; 1189 1190 err = ip6_tnl_encap(skb, t, &proto, fl6); 1191 if (err) 1192 return err; 1193 1194 skb_push(skb, sizeof(struct ipv6hdr)); 1195 skb_reset_network_header(skb); 1196 ipv6h = ipv6_hdr(skb); 1197 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), 1198 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); 1199 ipv6h->hop_limit = hop_limit; 1200 ipv6h->nexthdr = proto; 1201 ipv6h->saddr = fl6->saddr; 1202 ipv6h->daddr = fl6->daddr; 1203 ip6tunnel_xmit(NULL, skb, dev); 1204 return 0; 1205 tx_err_link_failure: 1206 stats->tx_carrier_errors++; 1207 dst_link_failure(skb); 1208 tx_err_dst_release: 1209 dst_release(dst); 1210 return err; 1211 } 1212 EXPORT_SYMBOL(ip6_tnl_xmit); 1213 1214 static inline int 1215 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1216 { 1217 struct ip6_tnl *t = netdev_priv(dev); 1218 const struct iphdr *iph = ip_hdr(skb); 1219 int encap_limit = -1; 1220 struct flowi6 fl6; 1221 __u8 dsfield; 1222 __u32 mtu; 1223 u8 tproto; 1224 int err; 1225 1226 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1227 1228 tproto = ACCESS_ONCE(t->parms.proto); 1229 if (tproto != IPPROTO_IPIP && tproto != 0) 1230 return -1; 1231 1232 dsfield = ipv4_get_dsfield(iph); 1233 1234 if (t->parms.collect_md) { 1235 struct ip_tunnel_info *tun_info; 1236 const struct ip_tunnel_key *key; 1237 1238 tun_info = skb_tunnel_info(skb); 1239 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1240 ip_tunnel_info_af(tun_info) != AF_INET6)) 1241 return -1; 1242 key = &tun_info->key; 1243 memset(&fl6, 0, sizeof(fl6)); 1244 fl6.flowi6_proto = IPPROTO_IPIP; 1245 fl6.daddr = key->u.ipv6.dst; 1246 fl6.flowlabel = key->label; 1247 } else { 1248 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1249 encap_limit = t->parms.encap_limit; 1250 1251 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1252 fl6.flowi6_proto = IPPROTO_IPIP; 1253 1254 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1255 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) 1256 & IPV6_TCLASS_MASK; 1257 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1258 fl6.flowi6_mark = skb->mark; 1259 } 1260 1261 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1262 1263 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1264 return -1; 1265 1266 skb_set_inner_ipproto(skb, IPPROTO_IPIP); 1267 1268 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1269 IPPROTO_IPIP); 1270 if (err != 0) { 1271 /* XXX: send ICMP error even if DF is not set. */ 1272 if (err == -EMSGSIZE) 1273 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 1274 htonl(mtu)); 1275 return -1; 1276 } 1277 1278 return 0; 1279 } 1280 1281 static inline int 1282 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1283 { 1284 struct ip6_tnl *t = netdev_priv(dev); 1285 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 1286 int encap_limit = -1; 1287 __u16 offset; 1288 struct flowi6 fl6; 1289 __u8 dsfield; 1290 __u32 mtu; 1291 u8 tproto; 1292 int err; 1293 1294 tproto = ACCESS_ONCE(t->parms.proto); 1295 if ((tproto != IPPROTO_IPV6 && tproto != 0) || 1296 ip6_tnl_addr_conflict(t, ipv6h)) 1297 return -1; 1298 1299 dsfield = ipv6_get_dsfield(ipv6h); 1300 1301 if (t->parms.collect_md) { 1302 struct ip_tunnel_info *tun_info; 1303 const struct ip_tunnel_key *key; 1304 1305 tun_info = skb_tunnel_info(skb); 1306 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1307 ip_tunnel_info_af(tun_info) != AF_INET6)) 1308 return -1; 1309 key = &tun_info->key; 1310 memset(&fl6, 0, sizeof(fl6)); 1311 fl6.flowi6_proto = IPPROTO_IPV6; 1312 fl6.daddr = key->u.ipv6.dst; 1313 fl6.flowlabel = key->label; 1314 } else { 1315 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 1316 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 1317 ipv6h = ipv6_hdr(skb); 1318 if (offset > 0) { 1319 struct ipv6_tlv_tnl_enc_lim *tel; 1320 1321 tel = (void *)&skb_network_header(skb)[offset]; 1322 if (tel->encap_limit == 0) { 1323 icmpv6_send(skb, ICMPV6_PARAMPROB, 1324 ICMPV6_HDR_FIELD, offset + 2); 1325 return -1; 1326 } 1327 encap_limit = tel->encap_limit - 1; 1328 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 1329 encap_limit = t->parms.encap_limit; 1330 } 1331 1332 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1333 fl6.flowi6_proto = IPPROTO_IPV6; 1334 1335 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1336 fl6.flowlabel |= (*(__be32 *)ipv6h & IPV6_TCLASS_MASK); 1337 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 1338 fl6.flowlabel |= ip6_flowlabel(ipv6h); 1339 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1340 fl6.flowi6_mark = skb->mark; 1341 } 1342 1343 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1344 1345 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1346 return -1; 1347 1348 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1349 1350 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1351 IPPROTO_IPV6); 1352 if (err != 0) { 1353 if (err == -EMSGSIZE) 1354 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1355 return -1; 1356 } 1357 1358 return 0; 1359 } 1360 1361 static netdev_tx_t 1362 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) 1363 { 1364 struct ip6_tnl *t = netdev_priv(dev); 1365 struct net_device_stats *stats = &t->dev->stats; 1366 int ret; 1367 1368 switch (skb->protocol) { 1369 case htons(ETH_P_IP): 1370 ret = ip4ip6_tnl_xmit(skb, dev); 1371 break; 1372 case htons(ETH_P_IPV6): 1373 ret = ip6ip6_tnl_xmit(skb, dev); 1374 break; 1375 default: 1376 goto tx_err; 1377 } 1378 1379 if (ret < 0) 1380 goto tx_err; 1381 1382 return NETDEV_TX_OK; 1383 1384 tx_err: 1385 stats->tx_errors++; 1386 stats->tx_dropped++; 1387 kfree_skb(skb); 1388 return NETDEV_TX_OK; 1389 } 1390 1391 static void ip6_tnl_link_config(struct ip6_tnl *t) 1392 { 1393 struct net_device *dev = t->dev; 1394 struct __ip6_tnl_parm *p = &t->parms; 1395 struct flowi6 *fl6 = &t->fl.u.ip6; 1396 int t_hlen; 1397 1398 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1399 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1400 1401 /* Set up flowi template */ 1402 fl6->saddr = p->laddr; 1403 fl6->daddr = p->raddr; 1404 fl6->flowi6_oif = p->link; 1405 fl6->flowlabel = 0; 1406 1407 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1408 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1409 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1410 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1411 1412 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1413 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1414 1415 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) 1416 dev->flags |= IFF_POINTOPOINT; 1417 else 1418 dev->flags &= ~IFF_POINTOPOINT; 1419 1420 t->tun_hlen = 0; 1421 t->hlen = t->encap_hlen + t->tun_hlen; 1422 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1423 1424 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1425 int strict = (ipv6_addr_type(&p->raddr) & 1426 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1427 1428 struct rt6_info *rt = rt6_lookup(t->net, 1429 &p->raddr, &p->laddr, 1430 p->link, strict); 1431 1432 if (!rt) 1433 return; 1434 1435 if (rt->dst.dev) { 1436 dev->hard_header_len = rt->dst.dev->hard_header_len + 1437 t_hlen; 1438 1439 dev->mtu = rt->dst.dev->mtu - t_hlen; 1440 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1441 dev->mtu -= 8; 1442 1443 if (dev->mtu < IPV6_MIN_MTU) 1444 dev->mtu = IPV6_MIN_MTU; 1445 } 1446 ip6_rt_put(rt); 1447 } 1448 } 1449 1450 /** 1451 * ip6_tnl_change - update the tunnel parameters 1452 * @t: tunnel to be changed 1453 * @p: tunnel configuration parameters 1454 * 1455 * Description: 1456 * ip6_tnl_change() updates the tunnel parameters 1457 **/ 1458 1459 static int 1460 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) 1461 { 1462 t->parms.laddr = p->laddr; 1463 t->parms.raddr = p->raddr; 1464 t->parms.flags = p->flags; 1465 t->parms.hop_limit = p->hop_limit; 1466 t->parms.encap_limit = p->encap_limit; 1467 t->parms.flowinfo = p->flowinfo; 1468 t->parms.link = p->link; 1469 t->parms.proto = p->proto; 1470 dst_cache_reset(&t->dst_cache); 1471 ip6_tnl_link_config(t); 1472 return 0; 1473 } 1474 1475 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1476 { 1477 struct net *net = t->net; 1478 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1479 int err; 1480 1481 ip6_tnl_unlink(ip6n, t); 1482 synchronize_net(); 1483 err = ip6_tnl_change(t, p); 1484 ip6_tnl_link(ip6n, t); 1485 netdev_state_change(t->dev); 1486 return err; 1487 } 1488 1489 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1490 { 1491 /* for default tnl0 device allow to change only the proto */ 1492 t->parms.proto = p->proto; 1493 netdev_state_change(t->dev); 1494 return 0; 1495 } 1496 1497 static void 1498 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) 1499 { 1500 p->laddr = u->laddr; 1501 p->raddr = u->raddr; 1502 p->flags = u->flags; 1503 p->hop_limit = u->hop_limit; 1504 p->encap_limit = u->encap_limit; 1505 p->flowinfo = u->flowinfo; 1506 p->link = u->link; 1507 p->proto = u->proto; 1508 memcpy(p->name, u->name, sizeof(u->name)); 1509 } 1510 1511 static void 1512 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) 1513 { 1514 u->laddr = p->laddr; 1515 u->raddr = p->raddr; 1516 u->flags = p->flags; 1517 u->hop_limit = p->hop_limit; 1518 u->encap_limit = p->encap_limit; 1519 u->flowinfo = p->flowinfo; 1520 u->link = p->link; 1521 u->proto = p->proto; 1522 memcpy(u->name, p->name, sizeof(u->name)); 1523 } 1524 1525 /** 1526 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace 1527 * @dev: virtual device associated with tunnel 1528 * @ifr: parameters passed from userspace 1529 * @cmd: command to be performed 1530 * 1531 * Description: 1532 * ip6_tnl_ioctl() is used for managing IPv6 tunnels 1533 * from userspace. 1534 * 1535 * The possible commands are the following: 1536 * %SIOCGETTUNNEL: get tunnel parameters for device 1537 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 1538 * %SIOCCHGTUNNEL: change tunnel parameters to those given 1539 * %SIOCDELTUNNEL: delete tunnel 1540 * 1541 * The fallback device "ip6tnl0", created during module 1542 * initialization, can be used for creating other tunnel devices. 1543 * 1544 * Return: 1545 * 0 on success, 1546 * %-EFAULT if unable to copy data to or from userspace, 1547 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 1548 * %-EINVAL if passed tunnel parameters are invalid, 1549 * %-EEXIST if changing a tunnel's parameters would cause a conflict 1550 * %-ENODEV if attempting to change or delete a nonexisting device 1551 **/ 1552 1553 static int 1554 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1555 { 1556 int err = 0; 1557 struct ip6_tnl_parm p; 1558 struct __ip6_tnl_parm p1; 1559 struct ip6_tnl *t = netdev_priv(dev); 1560 struct net *net = t->net; 1561 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1562 1563 memset(&p1, 0, sizeof(p1)); 1564 1565 switch (cmd) { 1566 case SIOCGETTUNNEL: 1567 if (dev == ip6n->fb_tnl_dev) { 1568 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1569 err = -EFAULT; 1570 break; 1571 } 1572 ip6_tnl_parm_from_user(&p1, &p); 1573 t = ip6_tnl_locate(net, &p1, 0); 1574 if (IS_ERR(t)) 1575 t = netdev_priv(dev); 1576 } else { 1577 memset(&p, 0, sizeof(p)); 1578 } 1579 ip6_tnl_parm_to_user(&p, &t->parms); 1580 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { 1581 err = -EFAULT; 1582 } 1583 break; 1584 case SIOCADDTUNNEL: 1585 case SIOCCHGTUNNEL: 1586 err = -EPERM; 1587 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1588 break; 1589 err = -EFAULT; 1590 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1591 break; 1592 err = -EINVAL; 1593 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 1594 p.proto != 0) 1595 break; 1596 ip6_tnl_parm_from_user(&p1, &p); 1597 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); 1598 if (cmd == SIOCCHGTUNNEL) { 1599 if (!IS_ERR(t)) { 1600 if (t->dev != dev) { 1601 err = -EEXIST; 1602 break; 1603 } 1604 } else 1605 t = netdev_priv(dev); 1606 if (dev == ip6n->fb_tnl_dev) 1607 err = ip6_tnl0_update(t, &p1); 1608 else 1609 err = ip6_tnl_update(t, &p1); 1610 } 1611 if (!IS_ERR(t)) { 1612 err = 0; 1613 ip6_tnl_parm_to_user(&p, &t->parms); 1614 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1615 err = -EFAULT; 1616 1617 } else { 1618 err = PTR_ERR(t); 1619 } 1620 break; 1621 case SIOCDELTUNNEL: 1622 err = -EPERM; 1623 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1624 break; 1625 1626 if (dev == ip6n->fb_tnl_dev) { 1627 err = -EFAULT; 1628 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1629 break; 1630 err = -ENOENT; 1631 ip6_tnl_parm_from_user(&p1, &p); 1632 t = ip6_tnl_locate(net, &p1, 0); 1633 if (IS_ERR(t)) 1634 break; 1635 err = -EPERM; 1636 if (t->dev == ip6n->fb_tnl_dev) 1637 break; 1638 dev = t->dev; 1639 } 1640 err = 0; 1641 unregister_netdevice(dev); 1642 break; 1643 default: 1644 err = -EINVAL; 1645 } 1646 return err; 1647 } 1648 1649 /** 1650 * ip6_tnl_change_mtu - change mtu manually for tunnel device 1651 * @dev: virtual device associated with tunnel 1652 * @new_mtu: the new mtu 1653 * 1654 * Return: 1655 * 0 on success, 1656 * %-EINVAL if mtu too small 1657 **/ 1658 1659 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) 1660 { 1661 struct ip6_tnl *tnl = netdev_priv(dev); 1662 1663 if (tnl->parms.proto == IPPROTO_IPIP) { 1664 if (new_mtu < ETH_MIN_MTU) 1665 return -EINVAL; 1666 } else { 1667 if (new_mtu < IPV6_MIN_MTU) 1668 return -EINVAL; 1669 } 1670 if (new_mtu > 0xFFF8 - dev->hard_header_len) 1671 return -EINVAL; 1672 dev->mtu = new_mtu; 1673 return 0; 1674 } 1675 EXPORT_SYMBOL(ip6_tnl_change_mtu); 1676 1677 int ip6_tnl_get_iflink(const struct net_device *dev) 1678 { 1679 struct ip6_tnl *t = netdev_priv(dev); 1680 1681 return t->parms.link; 1682 } 1683 EXPORT_SYMBOL(ip6_tnl_get_iflink); 1684 1685 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 1686 unsigned int num) 1687 { 1688 if (num >= MAX_IPTUN_ENCAP_OPS) 1689 return -ERANGE; 1690 1691 return !cmpxchg((const struct ip6_tnl_encap_ops **) 1692 &ip6tun_encaps[num], 1693 NULL, ops) ? 0 : -1; 1694 } 1695 EXPORT_SYMBOL(ip6_tnl_encap_add_ops); 1696 1697 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 1698 unsigned int num) 1699 { 1700 int ret; 1701 1702 if (num >= MAX_IPTUN_ENCAP_OPS) 1703 return -ERANGE; 1704 1705 ret = (cmpxchg((const struct ip6_tnl_encap_ops **) 1706 &ip6tun_encaps[num], 1707 ops, NULL) == ops) ? 0 : -1; 1708 1709 synchronize_net(); 1710 1711 return ret; 1712 } 1713 EXPORT_SYMBOL(ip6_tnl_encap_del_ops); 1714 1715 int ip6_tnl_encap_setup(struct ip6_tnl *t, 1716 struct ip_tunnel_encap *ipencap) 1717 { 1718 int hlen; 1719 1720 memset(&t->encap, 0, sizeof(t->encap)); 1721 1722 hlen = ip6_encap_hlen(ipencap); 1723 if (hlen < 0) 1724 return hlen; 1725 1726 t->encap.type = ipencap->type; 1727 t->encap.sport = ipencap->sport; 1728 t->encap.dport = ipencap->dport; 1729 t->encap.flags = ipencap->flags; 1730 1731 t->encap_hlen = hlen; 1732 t->hlen = t->encap_hlen + t->tun_hlen; 1733 1734 return 0; 1735 } 1736 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); 1737 1738 static const struct net_device_ops ip6_tnl_netdev_ops = { 1739 .ndo_init = ip6_tnl_dev_init, 1740 .ndo_uninit = ip6_tnl_dev_uninit, 1741 .ndo_start_xmit = ip6_tnl_start_xmit, 1742 .ndo_do_ioctl = ip6_tnl_ioctl, 1743 .ndo_change_mtu = ip6_tnl_change_mtu, 1744 .ndo_get_stats = ip6_get_stats, 1745 .ndo_get_iflink = ip6_tnl_get_iflink, 1746 }; 1747 1748 #define IPXIPX_FEATURES (NETIF_F_SG | \ 1749 NETIF_F_FRAGLIST | \ 1750 NETIF_F_HIGHDMA | \ 1751 NETIF_F_GSO_SOFTWARE | \ 1752 NETIF_F_HW_CSUM) 1753 1754 /** 1755 * ip6_tnl_dev_setup - setup virtual tunnel device 1756 * @dev: virtual device associated with tunnel 1757 * 1758 * Description: 1759 * Initialize function pointers and device parameters 1760 **/ 1761 1762 static void ip6_tnl_dev_setup(struct net_device *dev) 1763 { 1764 dev->netdev_ops = &ip6_tnl_netdev_ops; 1765 dev->destructor = ip6_dev_free; 1766 1767 dev->type = ARPHRD_TUNNEL6; 1768 dev->flags |= IFF_NOARP; 1769 dev->addr_len = sizeof(struct in6_addr); 1770 dev->features |= NETIF_F_LLTX; 1771 netif_keep_dst(dev); 1772 1773 dev->features |= IPXIPX_FEATURES; 1774 dev->hw_features |= IPXIPX_FEATURES; 1775 1776 /* This perm addr will be used as interface identifier by IPv6 */ 1777 dev->addr_assign_type = NET_ADDR_RANDOM; 1778 eth_random_addr(dev->perm_addr); 1779 } 1780 1781 1782 /** 1783 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices 1784 * @dev: virtual device associated with tunnel 1785 **/ 1786 1787 static inline int 1788 ip6_tnl_dev_init_gen(struct net_device *dev) 1789 { 1790 struct ip6_tnl *t = netdev_priv(dev); 1791 int ret; 1792 int t_hlen; 1793 1794 t->dev = dev; 1795 t->net = dev_net(dev); 1796 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1797 if (!dev->tstats) 1798 return -ENOMEM; 1799 1800 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); 1801 if (ret) 1802 goto free_stats; 1803 1804 ret = gro_cells_init(&t->gro_cells, dev); 1805 if (ret) 1806 goto destroy_dst; 1807 1808 t->tun_hlen = 0; 1809 t->hlen = t->encap_hlen + t->tun_hlen; 1810 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1811 1812 dev->type = ARPHRD_TUNNEL6; 1813 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1814 dev->mtu = ETH_DATA_LEN - t_hlen; 1815 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1816 dev->mtu -= 8; 1817 dev->min_mtu = ETH_MIN_MTU; 1818 dev->max_mtu = 0xFFF8 - dev->hard_header_len; 1819 1820 return 0; 1821 1822 destroy_dst: 1823 dst_cache_destroy(&t->dst_cache); 1824 free_stats: 1825 free_percpu(dev->tstats); 1826 dev->tstats = NULL; 1827 1828 return ret; 1829 } 1830 1831 /** 1832 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices 1833 * @dev: virtual device associated with tunnel 1834 **/ 1835 1836 static int ip6_tnl_dev_init(struct net_device *dev) 1837 { 1838 struct ip6_tnl *t = netdev_priv(dev); 1839 int err = ip6_tnl_dev_init_gen(dev); 1840 1841 if (err) 1842 return err; 1843 ip6_tnl_link_config(t); 1844 if (t->parms.collect_md) { 1845 dev->features |= NETIF_F_NETNS_LOCAL; 1846 netif_keep_dst(dev); 1847 } 1848 return 0; 1849 } 1850 1851 /** 1852 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device 1853 * @dev: fallback device 1854 * 1855 * Return: 0 1856 **/ 1857 1858 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) 1859 { 1860 struct ip6_tnl *t = netdev_priv(dev); 1861 struct net *net = dev_net(dev); 1862 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1863 1864 t->parms.proto = IPPROTO_IPV6; 1865 dev_hold(dev); 1866 1867 rcu_assign_pointer(ip6n->tnls_wc[0], t); 1868 return 0; 1869 } 1870 1871 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) 1872 { 1873 u8 proto; 1874 1875 if (!data || !data[IFLA_IPTUN_PROTO]) 1876 return 0; 1877 1878 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1879 if (proto != IPPROTO_IPV6 && 1880 proto != IPPROTO_IPIP && 1881 proto != 0) 1882 return -EINVAL; 1883 1884 return 0; 1885 } 1886 1887 static void ip6_tnl_netlink_parms(struct nlattr *data[], 1888 struct __ip6_tnl_parm *parms) 1889 { 1890 memset(parms, 0, sizeof(*parms)); 1891 1892 if (!data) 1893 return; 1894 1895 if (data[IFLA_IPTUN_LINK]) 1896 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1897 1898 if (data[IFLA_IPTUN_LOCAL]) 1899 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); 1900 1901 if (data[IFLA_IPTUN_REMOTE]) 1902 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); 1903 1904 if (data[IFLA_IPTUN_TTL]) 1905 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); 1906 1907 if (data[IFLA_IPTUN_ENCAP_LIMIT]) 1908 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); 1909 1910 if (data[IFLA_IPTUN_FLOWINFO]) 1911 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); 1912 1913 if (data[IFLA_IPTUN_FLAGS]) 1914 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); 1915 1916 if (data[IFLA_IPTUN_PROTO]) 1917 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1918 1919 if (data[IFLA_IPTUN_COLLECT_METADATA]) 1920 parms->collect_md = true; 1921 } 1922 1923 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], 1924 struct ip_tunnel_encap *ipencap) 1925 { 1926 bool ret = false; 1927 1928 memset(ipencap, 0, sizeof(*ipencap)); 1929 1930 if (!data) 1931 return ret; 1932 1933 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1934 ret = true; 1935 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1936 } 1937 1938 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1939 ret = true; 1940 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1941 } 1942 1943 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1944 ret = true; 1945 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1946 } 1947 1948 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1949 ret = true; 1950 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1951 } 1952 1953 return ret; 1954 } 1955 1956 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, 1957 struct nlattr *tb[], struct nlattr *data[]) 1958 { 1959 struct net *net = dev_net(dev); 1960 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1961 struct ip6_tnl *nt, *t; 1962 struct ip_tunnel_encap ipencap; 1963 1964 nt = netdev_priv(dev); 1965 1966 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 1967 int err = ip6_tnl_encap_setup(nt, &ipencap); 1968 1969 if (err < 0) 1970 return err; 1971 } 1972 1973 ip6_tnl_netlink_parms(data, &nt->parms); 1974 1975 if (nt->parms.collect_md) { 1976 if (rtnl_dereference(ip6n->collect_md_tun)) 1977 return -EEXIST; 1978 } else { 1979 t = ip6_tnl_locate(net, &nt->parms, 0); 1980 if (!IS_ERR(t)) 1981 return -EEXIST; 1982 } 1983 1984 return ip6_tnl_create2(dev); 1985 } 1986 1987 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], 1988 struct nlattr *data[]) 1989 { 1990 struct ip6_tnl *t = netdev_priv(dev); 1991 struct __ip6_tnl_parm p; 1992 struct net *net = t->net; 1993 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1994 struct ip_tunnel_encap ipencap; 1995 1996 if (dev == ip6n->fb_tnl_dev) 1997 return -EINVAL; 1998 1999 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 2000 int err = ip6_tnl_encap_setup(t, &ipencap); 2001 2002 if (err < 0) 2003 return err; 2004 } 2005 ip6_tnl_netlink_parms(data, &p); 2006 if (p.collect_md) 2007 return -EINVAL; 2008 2009 t = ip6_tnl_locate(net, &p, 0); 2010 if (!IS_ERR(t)) { 2011 if (t->dev != dev) 2012 return -EEXIST; 2013 } else 2014 t = netdev_priv(dev); 2015 2016 return ip6_tnl_update(t, &p); 2017 } 2018 2019 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) 2020 { 2021 struct net *net = dev_net(dev); 2022 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2023 2024 if (dev != ip6n->fb_tnl_dev) 2025 unregister_netdevice_queue(dev, head); 2026 } 2027 2028 static size_t ip6_tnl_get_size(const struct net_device *dev) 2029 { 2030 return 2031 /* IFLA_IPTUN_LINK */ 2032 nla_total_size(4) + 2033 /* IFLA_IPTUN_LOCAL */ 2034 nla_total_size(sizeof(struct in6_addr)) + 2035 /* IFLA_IPTUN_REMOTE */ 2036 nla_total_size(sizeof(struct in6_addr)) + 2037 /* IFLA_IPTUN_TTL */ 2038 nla_total_size(1) + 2039 /* IFLA_IPTUN_ENCAP_LIMIT */ 2040 nla_total_size(1) + 2041 /* IFLA_IPTUN_FLOWINFO */ 2042 nla_total_size(4) + 2043 /* IFLA_IPTUN_FLAGS */ 2044 nla_total_size(4) + 2045 /* IFLA_IPTUN_PROTO */ 2046 nla_total_size(1) + 2047 /* IFLA_IPTUN_ENCAP_TYPE */ 2048 nla_total_size(2) + 2049 /* IFLA_IPTUN_ENCAP_FLAGS */ 2050 nla_total_size(2) + 2051 /* IFLA_IPTUN_ENCAP_SPORT */ 2052 nla_total_size(2) + 2053 /* IFLA_IPTUN_ENCAP_DPORT */ 2054 nla_total_size(2) + 2055 /* IFLA_IPTUN_COLLECT_METADATA */ 2056 nla_total_size(0) + 2057 0; 2058 } 2059 2060 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) 2061 { 2062 struct ip6_tnl *tunnel = netdev_priv(dev); 2063 struct __ip6_tnl_parm *parm = &tunnel->parms; 2064 2065 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 2066 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || 2067 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || 2068 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || 2069 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || 2070 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || 2071 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || 2072 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) 2073 goto nla_put_failure; 2074 2075 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || 2076 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) || 2077 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || 2078 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) 2079 goto nla_put_failure; 2080 2081 if (parm->collect_md) 2082 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) 2083 goto nla_put_failure; 2084 return 0; 2085 2086 nla_put_failure: 2087 return -EMSGSIZE; 2088 } 2089 2090 struct net *ip6_tnl_get_link_net(const struct net_device *dev) 2091 { 2092 struct ip6_tnl *tunnel = netdev_priv(dev); 2093 2094 return tunnel->net; 2095 } 2096 EXPORT_SYMBOL(ip6_tnl_get_link_net); 2097 2098 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { 2099 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 2100 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, 2101 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, 2102 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 2103 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, 2104 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, 2105 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, 2106 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 2107 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 2108 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 2109 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 2110 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 2111 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, 2112 }; 2113 2114 static struct rtnl_link_ops ip6_link_ops __read_mostly = { 2115 .kind = "ip6tnl", 2116 .maxtype = IFLA_IPTUN_MAX, 2117 .policy = ip6_tnl_policy, 2118 .priv_size = sizeof(struct ip6_tnl), 2119 .setup = ip6_tnl_dev_setup, 2120 .validate = ip6_tnl_validate, 2121 .newlink = ip6_tnl_newlink, 2122 .changelink = ip6_tnl_changelink, 2123 .dellink = ip6_tnl_dellink, 2124 .get_size = ip6_tnl_get_size, 2125 .fill_info = ip6_tnl_fill_info, 2126 .get_link_net = ip6_tnl_get_link_net, 2127 }; 2128 2129 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { 2130 .handler = ip4ip6_rcv, 2131 .err_handler = ip4ip6_err, 2132 .priority = 1, 2133 }; 2134 2135 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { 2136 .handler = ip6ip6_rcv, 2137 .err_handler = ip6ip6_err, 2138 .priority = 1, 2139 }; 2140 2141 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) 2142 { 2143 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2144 struct net_device *dev, *aux; 2145 int h; 2146 struct ip6_tnl *t; 2147 LIST_HEAD(list); 2148 2149 for_each_netdev_safe(net, dev, aux) 2150 if (dev->rtnl_link_ops == &ip6_link_ops) 2151 unregister_netdevice_queue(dev, &list); 2152 2153 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) { 2154 t = rtnl_dereference(ip6n->tnls_r_l[h]); 2155 while (t) { 2156 /* If dev is in the same netns, it has already 2157 * been added to the list by the previous loop. 2158 */ 2159 if (!net_eq(dev_net(t->dev), net)) 2160 unregister_netdevice_queue(t->dev, &list); 2161 t = rtnl_dereference(t->next); 2162 } 2163 } 2164 2165 unregister_netdevice_many(&list); 2166 } 2167 2168 static int __net_init ip6_tnl_init_net(struct net *net) 2169 { 2170 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2171 struct ip6_tnl *t = NULL; 2172 int err; 2173 2174 ip6n->tnls[0] = ip6n->tnls_wc; 2175 ip6n->tnls[1] = ip6n->tnls_r_l; 2176 2177 err = -ENOMEM; 2178 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", 2179 NET_NAME_UNKNOWN, ip6_tnl_dev_setup); 2180 2181 if (!ip6n->fb_tnl_dev) 2182 goto err_alloc_dev; 2183 dev_net_set(ip6n->fb_tnl_dev, net); 2184 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; 2185 /* FB netdevice is special: we have one, and only one per netns. 2186 * Allowing to move it to another netns is clearly unsafe. 2187 */ 2188 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; 2189 2190 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); 2191 if (err < 0) 2192 goto err_register; 2193 2194 err = register_netdev(ip6n->fb_tnl_dev); 2195 if (err < 0) 2196 goto err_register; 2197 2198 t = netdev_priv(ip6n->fb_tnl_dev); 2199 2200 strcpy(t->parms.name, ip6n->fb_tnl_dev->name); 2201 return 0; 2202 2203 err_register: 2204 ip6_dev_free(ip6n->fb_tnl_dev); 2205 err_alloc_dev: 2206 return err; 2207 } 2208 2209 static void __net_exit ip6_tnl_exit_net(struct net *net) 2210 { 2211 rtnl_lock(); 2212 ip6_tnl_destroy_tunnels(net); 2213 rtnl_unlock(); 2214 } 2215 2216 static struct pernet_operations ip6_tnl_net_ops = { 2217 .init = ip6_tnl_init_net, 2218 .exit = ip6_tnl_exit_net, 2219 .id = &ip6_tnl_net_id, 2220 .size = sizeof(struct ip6_tnl_net), 2221 }; 2222 2223 /** 2224 * ip6_tunnel_init - register protocol and reserve needed resources 2225 * 2226 * Return: 0 on success 2227 **/ 2228 2229 static int __init ip6_tunnel_init(void) 2230 { 2231 int err; 2232 2233 err = register_pernet_device(&ip6_tnl_net_ops); 2234 if (err < 0) 2235 goto out_pernet; 2236 2237 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); 2238 if (err < 0) { 2239 pr_err("%s: can't register ip4ip6\n", __func__); 2240 goto out_ip4ip6; 2241 } 2242 2243 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); 2244 if (err < 0) { 2245 pr_err("%s: can't register ip6ip6\n", __func__); 2246 goto out_ip6ip6; 2247 } 2248 err = rtnl_link_register(&ip6_link_ops); 2249 if (err < 0) 2250 goto rtnl_link_failed; 2251 2252 return 0; 2253 2254 rtnl_link_failed: 2255 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); 2256 out_ip6ip6: 2257 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); 2258 out_ip4ip6: 2259 unregister_pernet_device(&ip6_tnl_net_ops); 2260 out_pernet: 2261 return err; 2262 } 2263 2264 /** 2265 * ip6_tunnel_cleanup - free resources and unregister protocol 2266 **/ 2267 2268 static void __exit ip6_tunnel_cleanup(void) 2269 { 2270 rtnl_link_unregister(&ip6_link_ops); 2271 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) 2272 pr_info("%s: can't deregister ip4ip6\n", __func__); 2273 2274 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) 2275 pr_info("%s: can't deregister ip6ip6\n", __func__); 2276 2277 unregister_pernet_device(&ip6_tnl_net_ops); 2278 } 2279 2280 module_init(ip6_tunnel_init); 2281 module_exit(ip6_tunnel_cleanup); 2282