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 && t->dev->flags & IFF_UP) 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 } 258 259 static int ip6_tnl_create2(struct net_device *dev) 260 { 261 struct ip6_tnl *t = netdev_priv(dev); 262 struct net *net = dev_net(dev); 263 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 264 int err; 265 266 t = netdev_priv(dev); 267 268 dev->rtnl_link_ops = &ip6_link_ops; 269 err = register_netdevice(dev); 270 if (err < 0) 271 goto out; 272 273 strcpy(t->parms.name, dev->name); 274 275 dev_hold(dev); 276 ip6_tnl_link(ip6n, t); 277 return 0; 278 279 out: 280 return err; 281 } 282 283 /** 284 * ip6_tnl_create - create a new tunnel 285 * @p: tunnel parameters 286 * @pt: pointer to new tunnel 287 * 288 * Description: 289 * Create tunnel matching given parameters. 290 * 291 * Return: 292 * created tunnel or error pointer 293 **/ 294 295 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) 296 { 297 struct net_device *dev; 298 struct ip6_tnl *t; 299 char name[IFNAMSIZ]; 300 int err = -ENOMEM; 301 302 if (p->name[0]) 303 strlcpy(name, p->name, IFNAMSIZ); 304 else 305 sprintf(name, "ip6tnl%%d"); 306 307 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 308 ip6_tnl_dev_setup); 309 if (!dev) 310 goto failed; 311 312 dev_net_set(dev, net); 313 314 t = netdev_priv(dev); 315 t->parms = *p; 316 t->net = dev_net(dev); 317 err = ip6_tnl_create2(dev); 318 if (err < 0) 319 goto failed_free; 320 321 return t; 322 323 failed_free: 324 free_netdev(dev); 325 failed: 326 return ERR_PTR(err); 327 } 328 329 /** 330 * ip6_tnl_locate - find or create tunnel matching given parameters 331 * @p: tunnel parameters 332 * @create: != 0 if allowed to create new tunnel if no match found 333 * 334 * Description: 335 * ip6_tnl_locate() first tries to locate an existing tunnel 336 * based on @parms. If this is unsuccessful, but @create is set a new 337 * tunnel device is created and registered for use. 338 * 339 * Return: 340 * matching tunnel or error pointer 341 **/ 342 343 static struct ip6_tnl *ip6_tnl_locate(struct net *net, 344 struct __ip6_tnl_parm *p, int create) 345 { 346 const struct in6_addr *remote = &p->raddr; 347 const struct in6_addr *local = &p->laddr; 348 struct ip6_tnl __rcu **tp; 349 struct ip6_tnl *t; 350 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 351 352 for (tp = ip6_tnl_bucket(ip6n, p); 353 (t = rtnl_dereference(*tp)) != NULL; 354 tp = &t->next) { 355 if (ipv6_addr_equal(local, &t->parms.laddr) && 356 ipv6_addr_equal(remote, &t->parms.raddr)) { 357 if (create) 358 return ERR_PTR(-EEXIST); 359 360 return t; 361 } 362 } 363 if (!create) 364 return ERR_PTR(-ENODEV); 365 return ip6_tnl_create(net, p); 366 } 367 368 /** 369 * ip6_tnl_dev_uninit - tunnel device uninitializer 370 * @dev: the device to be destroyed 371 * 372 * Description: 373 * ip6_tnl_dev_uninit() removes tunnel from its list 374 **/ 375 376 static void 377 ip6_tnl_dev_uninit(struct net_device *dev) 378 { 379 struct ip6_tnl *t = netdev_priv(dev); 380 struct net *net = t->net; 381 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 382 383 if (dev == ip6n->fb_tnl_dev) 384 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); 385 else 386 ip6_tnl_unlink(ip6n, t); 387 dst_cache_reset(&t->dst_cache); 388 dev_put(dev); 389 } 390 391 /** 392 * parse_tvl_tnl_enc_lim - handle encapsulation limit option 393 * @skb: received socket buffer 394 * 395 * Return: 396 * 0 if none was found, 397 * else index to encapsulation limit 398 **/ 399 400 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) 401 { 402 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw; 403 unsigned int nhoff = raw - skb->data; 404 unsigned int off = nhoff + sizeof(*ipv6h); 405 u8 next, nexthdr = ipv6h->nexthdr; 406 407 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { 408 struct ipv6_opt_hdr *hdr; 409 u16 optlen; 410 411 if (!pskb_may_pull(skb, off + sizeof(*hdr))) 412 break; 413 414 hdr = (struct ipv6_opt_hdr *)(skb->data + off); 415 if (nexthdr == NEXTHDR_FRAGMENT) { 416 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; 417 if (frag_hdr->frag_off) 418 break; 419 optlen = 8; 420 } else if (nexthdr == NEXTHDR_AUTH) { 421 optlen = (hdr->hdrlen + 2) << 2; 422 } else { 423 optlen = ipv6_optlen(hdr); 424 } 425 /* cache hdr->nexthdr, since pskb_may_pull() might 426 * invalidate hdr 427 */ 428 next = hdr->nexthdr; 429 if (nexthdr == NEXTHDR_DEST) { 430 u16 i = 2; 431 432 /* Remember : hdr is no longer valid at this point. */ 433 if (!pskb_may_pull(skb, off + optlen)) 434 break; 435 436 while (1) { 437 struct ipv6_tlv_tnl_enc_lim *tel; 438 439 /* No more room for encapsulation limit */ 440 if (i + sizeof(*tel) > optlen) 441 break; 442 443 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i); 444 /* return index of option if found and valid */ 445 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && 446 tel->length == 1) 447 return i + off - nhoff; 448 /* else jump to next option */ 449 if (tel->type) 450 i += tel->length + 2; 451 else 452 i++; 453 } 454 } 455 nexthdr = next; 456 off += optlen; 457 } 458 return 0; 459 } 460 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); 461 462 /** 463 * ip6_tnl_err - tunnel error handler 464 * 465 * Description: 466 * ip6_tnl_err() should handle errors in the tunnel according 467 * to the specifications in RFC 2473. 468 **/ 469 470 static int 471 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, 472 u8 *type, u8 *code, int *msg, __u32 *info, int offset) 473 { 474 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; 475 struct ip6_tnl *t; 476 int rel_msg = 0; 477 u8 rel_type = ICMPV6_DEST_UNREACH; 478 u8 rel_code = ICMPV6_ADDR_UNREACH; 479 u8 tproto; 480 __u32 rel_info = 0; 481 __u16 len; 482 int err = -ENOENT; 483 484 /* If the packet doesn't contain the original IPv6 header we are 485 in trouble since we might need the source address for further 486 processing of the error. */ 487 488 rcu_read_lock(); 489 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); 490 if (!t) 491 goto out; 492 493 tproto = ACCESS_ONCE(t->parms.proto); 494 if (tproto != ipproto && tproto != 0) 495 goto out; 496 497 err = 0; 498 499 switch (*type) { 500 __u32 teli; 501 struct ipv6_tlv_tnl_enc_lim *tel; 502 __u32 mtu; 503 case ICMPV6_DEST_UNREACH: 504 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 505 t->parms.name); 506 rel_msg = 1; 507 break; 508 case ICMPV6_TIME_EXCEED: 509 if ((*code) == ICMPV6_EXC_HOPLIMIT) { 510 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 511 t->parms.name); 512 rel_msg = 1; 513 } 514 break; 515 case ICMPV6_PARAMPROB: 516 teli = 0; 517 if ((*code) == ICMPV6_HDR_FIELD) 518 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 519 520 if (teli && teli == *info - 2) { 521 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 522 if (tel->encap_limit == 0) { 523 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 524 t->parms.name); 525 rel_msg = 1; 526 } 527 } else { 528 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 529 t->parms.name); 530 } 531 break; 532 case ICMPV6_PKT_TOOBIG: 533 mtu = *info - offset; 534 if (mtu < IPV6_MIN_MTU) 535 mtu = IPV6_MIN_MTU; 536 t->dev->mtu = mtu; 537 538 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); 539 if (len > mtu) { 540 rel_type = ICMPV6_PKT_TOOBIG; 541 rel_code = 0; 542 rel_info = mtu; 543 rel_msg = 1; 544 } 545 break; 546 } 547 548 *type = rel_type; 549 *code = rel_code; 550 *info = rel_info; 551 *msg = rel_msg; 552 553 out: 554 rcu_read_unlock(); 555 return err; 556 } 557 558 static int 559 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 560 u8 type, u8 code, int offset, __be32 info) 561 { 562 int rel_msg = 0; 563 u8 rel_type = type; 564 u8 rel_code = code; 565 __u32 rel_info = ntohl(info); 566 int err; 567 struct sk_buff *skb2; 568 const struct iphdr *eiph; 569 struct rtable *rt; 570 struct flowi4 fl4; 571 572 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, 573 &rel_msg, &rel_info, offset); 574 if (err < 0) 575 return err; 576 577 if (rel_msg == 0) 578 return 0; 579 580 switch (rel_type) { 581 case ICMPV6_DEST_UNREACH: 582 if (rel_code != ICMPV6_ADDR_UNREACH) 583 return 0; 584 rel_type = ICMP_DEST_UNREACH; 585 rel_code = ICMP_HOST_UNREACH; 586 break; 587 case ICMPV6_PKT_TOOBIG: 588 if (rel_code != 0) 589 return 0; 590 rel_type = ICMP_DEST_UNREACH; 591 rel_code = ICMP_FRAG_NEEDED; 592 break; 593 case NDISC_REDIRECT: 594 rel_type = ICMP_REDIRECT; 595 rel_code = ICMP_REDIR_HOST; 596 /* fall through */ 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 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) || 774 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))) 775 ret = 1; 776 } 777 return ret; 778 } 779 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); 780 781 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 782 const struct tnl_ptk_info *tpi, 783 struct metadata_dst *tun_dst, 784 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 785 const struct ipv6hdr *ipv6h, 786 struct sk_buff *skb), 787 bool log_ecn_err) 788 { 789 struct pcpu_sw_netstats *tstats; 790 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 791 int err; 792 793 if ((!(tpi->flags & TUNNEL_CSUM) && 794 (tunnel->parms.i_flags & TUNNEL_CSUM)) || 795 ((tpi->flags & TUNNEL_CSUM) && 796 !(tunnel->parms.i_flags & TUNNEL_CSUM))) { 797 tunnel->dev->stats.rx_crc_errors++; 798 tunnel->dev->stats.rx_errors++; 799 goto drop; 800 } 801 802 if (tunnel->parms.i_flags & TUNNEL_SEQ) { 803 if (!(tpi->flags & TUNNEL_SEQ) || 804 (tunnel->i_seqno && 805 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { 806 tunnel->dev->stats.rx_fifo_errors++; 807 tunnel->dev->stats.rx_errors++; 808 goto drop; 809 } 810 tunnel->i_seqno = ntohl(tpi->seq) + 1; 811 } 812 813 skb->protocol = tpi->proto; 814 815 /* Warning: All skb pointers will be invalidated! */ 816 if (tunnel->dev->type == ARPHRD_ETHER) { 817 if (!pskb_may_pull(skb, ETH_HLEN)) { 818 tunnel->dev->stats.rx_length_errors++; 819 tunnel->dev->stats.rx_errors++; 820 goto drop; 821 } 822 823 ipv6h = ipv6_hdr(skb); 824 skb->protocol = eth_type_trans(skb, tunnel->dev); 825 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 826 } else { 827 skb->dev = tunnel->dev; 828 } 829 830 skb_reset_network_header(skb); 831 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 832 833 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); 834 835 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); 836 if (unlikely(err)) { 837 if (log_ecn_err) 838 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", 839 &ipv6h->saddr, 840 ipv6_get_dsfield(ipv6h)); 841 if (err > 1) { 842 ++tunnel->dev->stats.rx_frame_errors; 843 ++tunnel->dev->stats.rx_errors; 844 goto drop; 845 } 846 } 847 848 tstats = this_cpu_ptr(tunnel->dev->tstats); 849 u64_stats_update_begin(&tstats->syncp); 850 tstats->rx_packets++; 851 tstats->rx_bytes += skb->len; 852 u64_stats_update_end(&tstats->syncp); 853 854 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); 855 856 if (tun_dst) 857 skb_dst_set(skb, (struct dst_entry *)tun_dst); 858 859 gro_cells_receive(&tunnel->gro_cells, skb); 860 return 0; 861 862 drop: 863 if (tun_dst) 864 dst_release((struct dst_entry *)tun_dst); 865 kfree_skb(skb); 866 return 0; 867 } 868 869 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, 870 const struct tnl_ptk_info *tpi, 871 struct metadata_dst *tun_dst, 872 bool log_ecn_err) 873 { 874 return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate, 875 log_ecn_err); 876 } 877 EXPORT_SYMBOL(ip6_tnl_rcv); 878 879 static const struct tnl_ptk_info tpi_v6 = { 880 /* no tunnel info required for ipxip6. */ 881 .proto = htons(ETH_P_IPV6), 882 }; 883 884 static const struct tnl_ptk_info tpi_v4 = { 885 /* no tunnel info required for ipxip6. */ 886 .proto = htons(ETH_P_IP), 887 }; 888 889 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, 890 const struct tnl_ptk_info *tpi, 891 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 892 const struct ipv6hdr *ipv6h, 893 struct sk_buff *skb)) 894 { 895 struct ip6_tnl *t; 896 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 897 struct metadata_dst *tun_dst = NULL; 898 int ret = -1; 899 900 rcu_read_lock(); 901 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); 902 903 if (t) { 904 u8 tproto = ACCESS_ONCE(t->parms.proto); 905 906 if (tproto != ipproto && tproto != 0) 907 goto drop; 908 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 909 goto drop; 910 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) 911 goto drop; 912 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 913 goto drop; 914 if (t->parms.collect_md) { 915 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0); 916 if (!tun_dst) 917 return 0; 918 } 919 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, 920 log_ecn_error); 921 } 922 923 rcu_read_unlock(); 924 925 return ret; 926 927 drop: 928 rcu_read_unlock(); 929 kfree_skb(skb); 930 return 0; 931 } 932 933 static int ip4ip6_rcv(struct sk_buff *skb) 934 { 935 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4, 936 ip4ip6_dscp_ecn_decapsulate); 937 } 938 939 static int ip6ip6_rcv(struct sk_buff *skb) 940 { 941 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, 942 ip6ip6_dscp_ecn_decapsulate); 943 } 944 945 struct ipv6_tel_txoption { 946 struct ipv6_txoptions ops; 947 __u8 dst_opt[8]; 948 }; 949 950 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) 951 { 952 memset(opt, 0, sizeof(struct ipv6_tel_txoption)); 953 954 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; 955 opt->dst_opt[3] = 1; 956 opt->dst_opt[4] = encap_limit; 957 opt->dst_opt[5] = IPV6_TLV_PADN; 958 opt->dst_opt[6] = 1; 959 960 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt; 961 opt->ops.opt_nflen = 8; 962 } 963 964 /** 965 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 966 * @t: the outgoing tunnel device 967 * @hdr: IPv6 header from the incoming packet 968 * 969 * Description: 970 * Avoid trivial tunneling loop by checking that tunnel exit-point 971 * doesn't match source of incoming packet. 972 * 973 * Return: 974 * 1 if conflict, 975 * 0 else 976 **/ 977 978 static inline bool 979 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) 980 { 981 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 982 } 983 984 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, 985 const struct in6_addr *laddr, 986 const struct in6_addr *raddr) 987 { 988 struct __ip6_tnl_parm *p = &t->parms; 989 int ret = 0; 990 struct net *net = t->net; 991 992 if ((p->flags & IP6_TNL_F_CAP_XMIT) || 993 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 994 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { 995 struct net_device *ldev = NULL; 996 997 rcu_read_lock(); 998 if (p->link) 999 ldev = dev_get_by_index_rcu(net, p->link); 1000 1001 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) 1002 pr_warn("%s xmit: Local address not yet configured!\n", 1003 p->name); 1004 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) && 1005 !ipv6_addr_is_multicast(raddr) && 1006 unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) 1007 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", 1008 p->name); 1009 else 1010 ret = 1; 1011 rcu_read_unlock(); 1012 } 1013 return ret; 1014 } 1015 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); 1016 1017 /** 1018 * ip6_tnl_xmit - encapsulate packet and send 1019 * @skb: the outgoing socket buffer 1020 * @dev: the outgoing tunnel device 1021 * @dsfield: dscp code for outer header 1022 * @fl6: flow of tunneled packet 1023 * @encap_limit: encapsulation limit 1024 * @pmtu: Path MTU is stored if packet is too big 1025 * @proto: next header value 1026 * 1027 * Description: 1028 * Build new header and do some sanity checks on the packet before sending 1029 * it. 1030 * 1031 * Return: 1032 * 0 on success 1033 * -1 fail 1034 * %-EMSGSIZE message too big. return mtu in this case. 1035 **/ 1036 1037 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 1038 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, 1039 __u8 proto) 1040 { 1041 struct ip6_tnl *t = netdev_priv(dev); 1042 struct net *net = t->net; 1043 struct net_device_stats *stats = &t->dev->stats; 1044 struct ipv6hdr *ipv6h; 1045 struct ipv6_tel_txoption opt; 1046 struct dst_entry *dst = NULL, *ndst = NULL; 1047 struct net_device *tdev; 1048 int mtu; 1049 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0; 1050 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; 1051 unsigned int max_headroom = psh_hlen; 1052 bool use_cache = false; 1053 u8 hop_limit; 1054 int err = -1; 1055 1056 if (t->parms.collect_md) { 1057 hop_limit = skb_tunnel_info(skb)->key.ttl; 1058 goto route_lookup; 1059 } else { 1060 hop_limit = t->parms.hop_limit; 1061 } 1062 1063 /* NBMA tunnel */ 1064 if (ipv6_addr_any(&t->parms.raddr)) { 1065 if (skb->protocol == htons(ETH_P_IPV6)) { 1066 struct in6_addr *addr6; 1067 struct neighbour *neigh; 1068 int addr_type; 1069 1070 if (!skb_dst(skb)) 1071 goto tx_err_link_failure; 1072 1073 neigh = dst_neigh_lookup(skb_dst(skb), 1074 &ipv6_hdr(skb)->daddr); 1075 if (!neigh) 1076 goto tx_err_link_failure; 1077 1078 addr6 = (struct in6_addr *)&neigh->primary_key; 1079 addr_type = ipv6_addr_type(addr6); 1080 1081 if (addr_type == IPV6_ADDR_ANY) 1082 addr6 = &ipv6_hdr(skb)->daddr; 1083 1084 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); 1085 neigh_release(neigh); 1086 } 1087 } else if (!(t->parms.flags & 1088 (IP6_TNL_F_USE_ORIG_TCLASS | IP6_TNL_F_USE_ORIG_FWMARK))) { 1089 /* enable the cache only only if the routing decision does 1090 * not depend on the current inner header value 1091 */ 1092 use_cache = true; 1093 } 1094 1095 if (use_cache) 1096 dst = dst_cache_get(&t->dst_cache); 1097 1098 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) 1099 goto tx_err_link_failure; 1100 1101 if (!dst) { 1102 route_lookup: 1103 /* add dsfield to flowlabel for route lookup */ 1104 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel); 1105 1106 dst = ip6_route_output(net, NULL, fl6); 1107 1108 if (dst->error) 1109 goto tx_err_link_failure; 1110 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); 1111 if (IS_ERR(dst)) { 1112 err = PTR_ERR(dst); 1113 dst = NULL; 1114 goto tx_err_link_failure; 1115 } 1116 if (t->parms.collect_md && 1117 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, 1118 &fl6->daddr, 0, &fl6->saddr)) 1119 goto tx_err_link_failure; 1120 ndst = dst; 1121 } 1122 1123 tdev = dst->dev; 1124 1125 if (tdev == dev) { 1126 stats->collisions++; 1127 net_warn_ratelimited("%s: Local routing loop detected!\n", 1128 t->parms.name); 1129 goto tx_err_dst_release; 1130 } 1131 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen; 1132 if (encap_limit >= 0) { 1133 max_headroom += 8; 1134 mtu -= 8; 1135 } 1136 if (mtu < IPV6_MIN_MTU) 1137 mtu = IPV6_MIN_MTU; 1138 if (skb_dst(skb) && !t->parms.collect_md) 1139 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 1140 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) { 1141 *pmtu = mtu; 1142 err = -EMSGSIZE; 1143 goto tx_err_dst_release; 1144 } 1145 1146 if (t->err_count > 0) { 1147 if (time_before(jiffies, 1148 t->err_time + IP6TUNNEL_ERR_TIMEO)) { 1149 t->err_count--; 1150 1151 dst_link_failure(skb); 1152 } else { 1153 t->err_count = 0; 1154 } 1155 } 1156 1157 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); 1158 1159 /* 1160 * Okay, now see if we can stuff it in the buffer as-is. 1161 */ 1162 max_headroom += LL_RESERVED_SPACE(tdev); 1163 1164 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1165 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1166 struct sk_buff *new_skb; 1167 1168 new_skb = skb_realloc_headroom(skb, max_headroom); 1169 if (!new_skb) 1170 goto tx_err_dst_release; 1171 1172 if (skb->sk) 1173 skb_set_owner_w(new_skb, skb->sk); 1174 consume_skb(skb); 1175 skb = new_skb; 1176 } 1177 1178 if (t->parms.collect_md) { 1179 if (t->encap.type != TUNNEL_ENCAP_NONE) 1180 goto tx_err_dst_release; 1181 } else { 1182 if (use_cache && ndst) 1183 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); 1184 } 1185 skb_dst_set(skb, dst); 1186 1187 if (encap_limit >= 0) { 1188 init_tel_txopt(&opt, encap_limit); 1189 ipv6_push_frag_opts(skb, &opt.ops, &proto); 1190 } 1191 hop_limit = hop_limit ? : ip6_dst_hoplimit(dst); 1192 1193 /* Calculate max headroom for all the headers and adjust 1194 * needed_headroom if necessary. 1195 */ 1196 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) 1197 + dst->header_len + t->hlen; 1198 if (max_headroom > dev->needed_headroom) 1199 dev->needed_headroom = max_headroom; 1200 1201 err = ip6_tnl_encap(skb, t, &proto, fl6); 1202 if (err) 1203 return err; 1204 1205 skb_push(skb, sizeof(struct ipv6hdr)); 1206 skb_reset_network_header(skb); 1207 ipv6h = ipv6_hdr(skb); 1208 ip6_flow_hdr(ipv6h, dsfield, 1209 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); 1210 ipv6h->hop_limit = hop_limit; 1211 ipv6h->nexthdr = proto; 1212 ipv6h->saddr = fl6->saddr; 1213 ipv6h->daddr = fl6->daddr; 1214 ip6tunnel_xmit(NULL, skb, dev); 1215 return 0; 1216 tx_err_link_failure: 1217 stats->tx_carrier_errors++; 1218 dst_link_failure(skb); 1219 tx_err_dst_release: 1220 dst_release(dst); 1221 return err; 1222 } 1223 EXPORT_SYMBOL(ip6_tnl_xmit); 1224 1225 static inline int 1226 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1227 { 1228 struct ip6_tnl *t = netdev_priv(dev); 1229 const struct iphdr *iph = ip_hdr(skb); 1230 int encap_limit = -1; 1231 struct flowi6 fl6; 1232 __u8 dsfield; 1233 __u32 mtu; 1234 u8 tproto; 1235 int err; 1236 1237 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1238 1239 tproto = ACCESS_ONCE(t->parms.proto); 1240 if (tproto != IPPROTO_IPIP && tproto != 0) 1241 return -1; 1242 1243 if (t->parms.collect_md) { 1244 struct ip_tunnel_info *tun_info; 1245 const struct ip_tunnel_key *key; 1246 1247 tun_info = skb_tunnel_info(skb); 1248 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1249 ip_tunnel_info_af(tun_info) != AF_INET6)) 1250 return -1; 1251 key = &tun_info->key; 1252 memset(&fl6, 0, sizeof(fl6)); 1253 fl6.flowi6_proto = IPPROTO_IPIP; 1254 fl6.daddr = key->u.ipv6.dst; 1255 fl6.flowlabel = key->label; 1256 dsfield = key->tos; 1257 } else { 1258 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1259 encap_limit = t->parms.encap_limit; 1260 1261 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1262 fl6.flowi6_proto = IPPROTO_IPIP; 1263 1264 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1265 dsfield = ipv4_get_dsfield(iph); 1266 else 1267 dsfield = ip6_tclass(t->parms.flowinfo); 1268 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1269 fl6.flowi6_mark = skb->mark; 1270 else 1271 fl6.flowi6_mark = t->parms.fwmark; 1272 } 1273 1274 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1275 1276 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1277 return -1; 1278 1279 dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph)); 1280 1281 skb_set_inner_ipproto(skb, IPPROTO_IPIP); 1282 1283 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1284 IPPROTO_IPIP); 1285 if (err != 0) { 1286 /* XXX: send ICMP error even if DF is not set. */ 1287 if (err == -EMSGSIZE) 1288 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 1289 htonl(mtu)); 1290 return -1; 1291 } 1292 1293 return 0; 1294 } 1295 1296 static inline int 1297 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1298 { 1299 struct ip6_tnl *t = netdev_priv(dev); 1300 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 1301 int encap_limit = -1; 1302 __u16 offset; 1303 struct flowi6 fl6; 1304 __u8 dsfield; 1305 __u32 mtu; 1306 u8 tproto; 1307 int err; 1308 1309 tproto = ACCESS_ONCE(t->parms.proto); 1310 if ((tproto != IPPROTO_IPV6 && tproto != 0) || 1311 ip6_tnl_addr_conflict(t, ipv6h)) 1312 return -1; 1313 1314 if (t->parms.collect_md) { 1315 struct ip_tunnel_info *tun_info; 1316 const struct ip_tunnel_key *key; 1317 1318 tun_info = skb_tunnel_info(skb); 1319 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1320 ip_tunnel_info_af(tun_info) != AF_INET6)) 1321 return -1; 1322 key = &tun_info->key; 1323 memset(&fl6, 0, sizeof(fl6)); 1324 fl6.flowi6_proto = IPPROTO_IPV6; 1325 fl6.daddr = key->u.ipv6.dst; 1326 fl6.flowlabel = key->label; 1327 dsfield = key->tos; 1328 } else { 1329 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 1330 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 1331 ipv6h = ipv6_hdr(skb); 1332 if (offset > 0) { 1333 struct ipv6_tlv_tnl_enc_lim *tel; 1334 1335 tel = (void *)&skb_network_header(skb)[offset]; 1336 if (tel->encap_limit == 0) { 1337 icmpv6_send(skb, ICMPV6_PARAMPROB, 1338 ICMPV6_HDR_FIELD, offset + 2); 1339 return -1; 1340 } 1341 encap_limit = tel->encap_limit - 1; 1342 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 1343 encap_limit = t->parms.encap_limit; 1344 } 1345 1346 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1347 fl6.flowi6_proto = IPPROTO_IPV6; 1348 1349 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1350 dsfield = ipv6_get_dsfield(ipv6h); 1351 else 1352 dsfield = ip6_tclass(t->parms.flowinfo); 1353 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 1354 fl6.flowlabel |= ip6_flowlabel(ipv6h); 1355 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1356 fl6.flowi6_mark = skb->mark; 1357 else 1358 fl6.flowi6_mark = t->parms.fwmark; 1359 } 1360 1361 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1362 1363 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1364 return -1; 1365 1366 dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h)); 1367 1368 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1369 1370 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1371 IPPROTO_IPV6); 1372 if (err != 0) { 1373 if (err == -EMSGSIZE) 1374 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1375 return -1; 1376 } 1377 1378 return 0; 1379 } 1380 1381 static netdev_tx_t 1382 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) 1383 { 1384 struct ip6_tnl *t = netdev_priv(dev); 1385 struct net_device_stats *stats = &t->dev->stats; 1386 int ret; 1387 1388 switch (skb->protocol) { 1389 case htons(ETH_P_IP): 1390 ret = ip4ip6_tnl_xmit(skb, dev); 1391 break; 1392 case htons(ETH_P_IPV6): 1393 ret = ip6ip6_tnl_xmit(skb, dev); 1394 break; 1395 default: 1396 goto tx_err; 1397 } 1398 1399 if (ret < 0) 1400 goto tx_err; 1401 1402 return NETDEV_TX_OK; 1403 1404 tx_err: 1405 stats->tx_errors++; 1406 stats->tx_dropped++; 1407 kfree_skb(skb); 1408 return NETDEV_TX_OK; 1409 } 1410 1411 static void ip6_tnl_link_config(struct ip6_tnl *t) 1412 { 1413 struct net_device *dev = t->dev; 1414 struct __ip6_tnl_parm *p = &t->parms; 1415 struct flowi6 *fl6 = &t->fl.u.ip6; 1416 int t_hlen; 1417 1418 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1419 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1420 1421 /* Set up flowi template */ 1422 fl6->saddr = p->laddr; 1423 fl6->daddr = p->raddr; 1424 fl6->flowi6_oif = p->link; 1425 fl6->flowlabel = 0; 1426 1427 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1428 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1429 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1430 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1431 1432 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1433 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1434 1435 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) 1436 dev->flags |= IFF_POINTOPOINT; 1437 else 1438 dev->flags &= ~IFF_POINTOPOINT; 1439 1440 t->tun_hlen = 0; 1441 t->hlen = t->encap_hlen + t->tun_hlen; 1442 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1443 1444 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1445 int strict = (ipv6_addr_type(&p->raddr) & 1446 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1447 1448 struct rt6_info *rt = rt6_lookup(t->net, 1449 &p->raddr, &p->laddr, 1450 p->link, strict); 1451 1452 if (!rt) 1453 return; 1454 1455 if (rt->dst.dev) { 1456 dev->hard_header_len = rt->dst.dev->hard_header_len + 1457 t_hlen; 1458 1459 dev->mtu = rt->dst.dev->mtu - t_hlen; 1460 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1461 dev->mtu -= 8; 1462 1463 if (dev->mtu < IPV6_MIN_MTU) 1464 dev->mtu = IPV6_MIN_MTU; 1465 } 1466 ip6_rt_put(rt); 1467 } 1468 } 1469 1470 /** 1471 * ip6_tnl_change - update the tunnel parameters 1472 * @t: tunnel to be changed 1473 * @p: tunnel configuration parameters 1474 * 1475 * Description: 1476 * ip6_tnl_change() updates the tunnel parameters 1477 **/ 1478 1479 static int 1480 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) 1481 { 1482 t->parms.laddr = p->laddr; 1483 t->parms.raddr = p->raddr; 1484 t->parms.flags = p->flags; 1485 t->parms.hop_limit = p->hop_limit; 1486 t->parms.encap_limit = p->encap_limit; 1487 t->parms.flowinfo = p->flowinfo; 1488 t->parms.link = p->link; 1489 t->parms.proto = p->proto; 1490 t->parms.fwmark = p->fwmark; 1491 dst_cache_reset(&t->dst_cache); 1492 ip6_tnl_link_config(t); 1493 return 0; 1494 } 1495 1496 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1497 { 1498 struct net *net = t->net; 1499 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1500 int err; 1501 1502 ip6_tnl_unlink(ip6n, t); 1503 synchronize_net(); 1504 err = ip6_tnl_change(t, p); 1505 ip6_tnl_link(ip6n, t); 1506 netdev_state_change(t->dev); 1507 return err; 1508 } 1509 1510 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1511 { 1512 /* for default tnl0 device allow to change only the proto */ 1513 t->parms.proto = p->proto; 1514 netdev_state_change(t->dev); 1515 return 0; 1516 } 1517 1518 static void 1519 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) 1520 { 1521 p->laddr = u->laddr; 1522 p->raddr = u->raddr; 1523 p->flags = u->flags; 1524 p->hop_limit = u->hop_limit; 1525 p->encap_limit = u->encap_limit; 1526 p->flowinfo = u->flowinfo; 1527 p->link = u->link; 1528 p->proto = u->proto; 1529 memcpy(p->name, u->name, sizeof(u->name)); 1530 } 1531 1532 static void 1533 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) 1534 { 1535 u->laddr = p->laddr; 1536 u->raddr = p->raddr; 1537 u->flags = p->flags; 1538 u->hop_limit = p->hop_limit; 1539 u->encap_limit = p->encap_limit; 1540 u->flowinfo = p->flowinfo; 1541 u->link = p->link; 1542 u->proto = p->proto; 1543 memcpy(u->name, p->name, sizeof(u->name)); 1544 } 1545 1546 /** 1547 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace 1548 * @dev: virtual device associated with tunnel 1549 * @ifr: parameters passed from userspace 1550 * @cmd: command to be performed 1551 * 1552 * Description: 1553 * ip6_tnl_ioctl() is used for managing IPv6 tunnels 1554 * from userspace. 1555 * 1556 * The possible commands are the following: 1557 * %SIOCGETTUNNEL: get tunnel parameters for device 1558 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 1559 * %SIOCCHGTUNNEL: change tunnel parameters to those given 1560 * %SIOCDELTUNNEL: delete tunnel 1561 * 1562 * The fallback device "ip6tnl0", created during module 1563 * initialization, can be used for creating other tunnel devices. 1564 * 1565 * Return: 1566 * 0 on success, 1567 * %-EFAULT if unable to copy data to or from userspace, 1568 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 1569 * %-EINVAL if passed tunnel parameters are invalid, 1570 * %-EEXIST if changing a tunnel's parameters would cause a conflict 1571 * %-ENODEV if attempting to change or delete a nonexisting device 1572 **/ 1573 1574 static int 1575 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1576 { 1577 int err = 0; 1578 struct ip6_tnl_parm p; 1579 struct __ip6_tnl_parm p1; 1580 struct ip6_tnl *t = netdev_priv(dev); 1581 struct net *net = t->net; 1582 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1583 1584 memset(&p1, 0, sizeof(p1)); 1585 1586 switch (cmd) { 1587 case SIOCGETTUNNEL: 1588 if (dev == ip6n->fb_tnl_dev) { 1589 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1590 err = -EFAULT; 1591 break; 1592 } 1593 ip6_tnl_parm_from_user(&p1, &p); 1594 t = ip6_tnl_locate(net, &p1, 0); 1595 if (IS_ERR(t)) 1596 t = netdev_priv(dev); 1597 } else { 1598 memset(&p, 0, sizeof(p)); 1599 } 1600 ip6_tnl_parm_to_user(&p, &t->parms); 1601 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { 1602 err = -EFAULT; 1603 } 1604 break; 1605 case SIOCADDTUNNEL: 1606 case SIOCCHGTUNNEL: 1607 err = -EPERM; 1608 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1609 break; 1610 err = -EFAULT; 1611 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1612 break; 1613 err = -EINVAL; 1614 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 1615 p.proto != 0) 1616 break; 1617 ip6_tnl_parm_from_user(&p1, &p); 1618 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); 1619 if (cmd == SIOCCHGTUNNEL) { 1620 if (!IS_ERR(t)) { 1621 if (t->dev != dev) { 1622 err = -EEXIST; 1623 break; 1624 } 1625 } else 1626 t = netdev_priv(dev); 1627 if (dev == ip6n->fb_tnl_dev) 1628 err = ip6_tnl0_update(t, &p1); 1629 else 1630 err = ip6_tnl_update(t, &p1); 1631 } 1632 if (!IS_ERR(t)) { 1633 err = 0; 1634 ip6_tnl_parm_to_user(&p, &t->parms); 1635 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1636 err = -EFAULT; 1637 1638 } else { 1639 err = PTR_ERR(t); 1640 } 1641 break; 1642 case SIOCDELTUNNEL: 1643 err = -EPERM; 1644 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1645 break; 1646 1647 if (dev == ip6n->fb_tnl_dev) { 1648 err = -EFAULT; 1649 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1650 break; 1651 err = -ENOENT; 1652 ip6_tnl_parm_from_user(&p1, &p); 1653 t = ip6_tnl_locate(net, &p1, 0); 1654 if (IS_ERR(t)) 1655 break; 1656 err = -EPERM; 1657 if (t->dev == ip6n->fb_tnl_dev) 1658 break; 1659 dev = t->dev; 1660 } 1661 err = 0; 1662 unregister_netdevice(dev); 1663 break; 1664 default: 1665 err = -EINVAL; 1666 } 1667 return err; 1668 } 1669 1670 /** 1671 * ip6_tnl_change_mtu - change mtu manually for tunnel device 1672 * @dev: virtual device associated with tunnel 1673 * @new_mtu: the new mtu 1674 * 1675 * Return: 1676 * 0 on success, 1677 * %-EINVAL if mtu too small 1678 **/ 1679 1680 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) 1681 { 1682 struct ip6_tnl *tnl = netdev_priv(dev); 1683 1684 if (tnl->parms.proto == IPPROTO_IPIP) { 1685 if (new_mtu < ETH_MIN_MTU) 1686 return -EINVAL; 1687 } else { 1688 if (new_mtu < IPV6_MIN_MTU) 1689 return -EINVAL; 1690 } 1691 if (new_mtu > 0xFFF8 - dev->hard_header_len) 1692 return -EINVAL; 1693 dev->mtu = new_mtu; 1694 return 0; 1695 } 1696 EXPORT_SYMBOL(ip6_tnl_change_mtu); 1697 1698 int ip6_tnl_get_iflink(const struct net_device *dev) 1699 { 1700 struct ip6_tnl *t = netdev_priv(dev); 1701 1702 return t->parms.link; 1703 } 1704 EXPORT_SYMBOL(ip6_tnl_get_iflink); 1705 1706 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 1707 unsigned int num) 1708 { 1709 if (num >= MAX_IPTUN_ENCAP_OPS) 1710 return -ERANGE; 1711 1712 return !cmpxchg((const struct ip6_tnl_encap_ops **) 1713 &ip6tun_encaps[num], 1714 NULL, ops) ? 0 : -1; 1715 } 1716 EXPORT_SYMBOL(ip6_tnl_encap_add_ops); 1717 1718 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 1719 unsigned int num) 1720 { 1721 int ret; 1722 1723 if (num >= MAX_IPTUN_ENCAP_OPS) 1724 return -ERANGE; 1725 1726 ret = (cmpxchg((const struct ip6_tnl_encap_ops **) 1727 &ip6tun_encaps[num], 1728 ops, NULL) == ops) ? 0 : -1; 1729 1730 synchronize_net(); 1731 1732 return ret; 1733 } 1734 EXPORT_SYMBOL(ip6_tnl_encap_del_ops); 1735 1736 int ip6_tnl_encap_setup(struct ip6_tnl *t, 1737 struct ip_tunnel_encap *ipencap) 1738 { 1739 int hlen; 1740 1741 memset(&t->encap, 0, sizeof(t->encap)); 1742 1743 hlen = ip6_encap_hlen(ipencap); 1744 if (hlen < 0) 1745 return hlen; 1746 1747 t->encap.type = ipencap->type; 1748 t->encap.sport = ipencap->sport; 1749 t->encap.dport = ipencap->dport; 1750 t->encap.flags = ipencap->flags; 1751 1752 t->encap_hlen = hlen; 1753 t->hlen = t->encap_hlen + t->tun_hlen; 1754 1755 return 0; 1756 } 1757 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); 1758 1759 static const struct net_device_ops ip6_tnl_netdev_ops = { 1760 .ndo_init = ip6_tnl_dev_init, 1761 .ndo_uninit = ip6_tnl_dev_uninit, 1762 .ndo_start_xmit = ip6_tnl_start_xmit, 1763 .ndo_do_ioctl = ip6_tnl_ioctl, 1764 .ndo_change_mtu = ip6_tnl_change_mtu, 1765 .ndo_get_stats = ip6_get_stats, 1766 .ndo_get_iflink = ip6_tnl_get_iflink, 1767 }; 1768 1769 #define IPXIPX_FEATURES (NETIF_F_SG | \ 1770 NETIF_F_FRAGLIST | \ 1771 NETIF_F_HIGHDMA | \ 1772 NETIF_F_GSO_SOFTWARE | \ 1773 NETIF_F_HW_CSUM) 1774 1775 /** 1776 * ip6_tnl_dev_setup - setup virtual tunnel device 1777 * @dev: virtual device associated with tunnel 1778 * 1779 * Description: 1780 * Initialize function pointers and device parameters 1781 **/ 1782 1783 static void ip6_tnl_dev_setup(struct net_device *dev) 1784 { 1785 dev->netdev_ops = &ip6_tnl_netdev_ops; 1786 dev->needs_free_netdev = true; 1787 dev->priv_destructor = ip6_dev_free; 1788 1789 dev->type = ARPHRD_TUNNEL6; 1790 dev->flags |= IFF_NOARP; 1791 dev->addr_len = sizeof(struct in6_addr); 1792 dev->features |= NETIF_F_LLTX; 1793 netif_keep_dst(dev); 1794 1795 dev->features |= IPXIPX_FEATURES; 1796 dev->hw_features |= IPXIPX_FEATURES; 1797 1798 /* This perm addr will be used as interface identifier by IPv6 */ 1799 dev->addr_assign_type = NET_ADDR_RANDOM; 1800 eth_random_addr(dev->perm_addr); 1801 } 1802 1803 1804 /** 1805 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices 1806 * @dev: virtual device associated with tunnel 1807 **/ 1808 1809 static inline int 1810 ip6_tnl_dev_init_gen(struct net_device *dev) 1811 { 1812 struct ip6_tnl *t = netdev_priv(dev); 1813 int ret; 1814 int t_hlen; 1815 1816 t->dev = dev; 1817 t->net = dev_net(dev); 1818 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1819 if (!dev->tstats) 1820 return -ENOMEM; 1821 1822 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); 1823 if (ret) 1824 goto free_stats; 1825 1826 ret = gro_cells_init(&t->gro_cells, dev); 1827 if (ret) 1828 goto destroy_dst; 1829 1830 t->tun_hlen = 0; 1831 t->hlen = t->encap_hlen + t->tun_hlen; 1832 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1833 1834 dev->type = ARPHRD_TUNNEL6; 1835 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1836 dev->mtu = ETH_DATA_LEN - t_hlen; 1837 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1838 dev->mtu -= 8; 1839 dev->min_mtu = ETH_MIN_MTU; 1840 dev->max_mtu = 0xFFF8 - dev->hard_header_len; 1841 1842 return 0; 1843 1844 destroy_dst: 1845 dst_cache_destroy(&t->dst_cache); 1846 free_stats: 1847 free_percpu(dev->tstats); 1848 dev->tstats = NULL; 1849 1850 return ret; 1851 } 1852 1853 /** 1854 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices 1855 * @dev: virtual device associated with tunnel 1856 **/ 1857 1858 static int ip6_tnl_dev_init(struct net_device *dev) 1859 { 1860 struct ip6_tnl *t = netdev_priv(dev); 1861 int err = ip6_tnl_dev_init_gen(dev); 1862 1863 if (err) 1864 return err; 1865 ip6_tnl_link_config(t); 1866 if (t->parms.collect_md) { 1867 dev->features |= NETIF_F_NETNS_LOCAL; 1868 netif_keep_dst(dev); 1869 } 1870 return 0; 1871 } 1872 1873 /** 1874 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device 1875 * @dev: fallback device 1876 * 1877 * Return: 0 1878 **/ 1879 1880 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) 1881 { 1882 struct ip6_tnl *t = netdev_priv(dev); 1883 struct net *net = dev_net(dev); 1884 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1885 1886 t->parms.proto = IPPROTO_IPV6; 1887 dev_hold(dev); 1888 1889 rcu_assign_pointer(ip6n->tnls_wc[0], t); 1890 return 0; 1891 } 1892 1893 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[], 1894 struct netlink_ext_ack *extack) 1895 { 1896 u8 proto; 1897 1898 if (!data || !data[IFLA_IPTUN_PROTO]) 1899 return 0; 1900 1901 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1902 if (proto != IPPROTO_IPV6 && 1903 proto != IPPROTO_IPIP && 1904 proto != 0) 1905 return -EINVAL; 1906 1907 return 0; 1908 } 1909 1910 static void ip6_tnl_netlink_parms(struct nlattr *data[], 1911 struct __ip6_tnl_parm *parms) 1912 { 1913 memset(parms, 0, sizeof(*parms)); 1914 1915 if (!data) 1916 return; 1917 1918 if (data[IFLA_IPTUN_LINK]) 1919 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1920 1921 if (data[IFLA_IPTUN_LOCAL]) 1922 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); 1923 1924 if (data[IFLA_IPTUN_REMOTE]) 1925 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); 1926 1927 if (data[IFLA_IPTUN_TTL]) 1928 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); 1929 1930 if (data[IFLA_IPTUN_ENCAP_LIMIT]) 1931 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); 1932 1933 if (data[IFLA_IPTUN_FLOWINFO]) 1934 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); 1935 1936 if (data[IFLA_IPTUN_FLAGS]) 1937 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); 1938 1939 if (data[IFLA_IPTUN_PROTO]) 1940 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1941 1942 if (data[IFLA_IPTUN_COLLECT_METADATA]) 1943 parms->collect_md = true; 1944 1945 if (data[IFLA_IPTUN_FWMARK]) 1946 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1947 } 1948 1949 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], 1950 struct ip_tunnel_encap *ipencap) 1951 { 1952 bool ret = false; 1953 1954 memset(ipencap, 0, sizeof(*ipencap)); 1955 1956 if (!data) 1957 return ret; 1958 1959 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1960 ret = true; 1961 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1962 } 1963 1964 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1965 ret = true; 1966 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1967 } 1968 1969 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1970 ret = true; 1971 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1972 } 1973 1974 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1975 ret = true; 1976 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1977 } 1978 1979 return ret; 1980 } 1981 1982 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, 1983 struct nlattr *tb[], struct nlattr *data[], 1984 struct netlink_ext_ack *extack) 1985 { 1986 struct net *net = dev_net(dev); 1987 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1988 struct ip6_tnl *nt, *t; 1989 struct ip_tunnel_encap ipencap; 1990 1991 nt = netdev_priv(dev); 1992 1993 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 1994 int err = ip6_tnl_encap_setup(nt, &ipencap); 1995 1996 if (err < 0) 1997 return err; 1998 } 1999 2000 ip6_tnl_netlink_parms(data, &nt->parms); 2001 2002 if (nt->parms.collect_md) { 2003 if (rtnl_dereference(ip6n->collect_md_tun)) 2004 return -EEXIST; 2005 } else { 2006 t = ip6_tnl_locate(net, &nt->parms, 0); 2007 if (!IS_ERR(t)) 2008 return -EEXIST; 2009 } 2010 2011 return ip6_tnl_create2(dev); 2012 } 2013 2014 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], 2015 struct nlattr *data[], 2016 struct netlink_ext_ack *extack) 2017 { 2018 struct ip6_tnl *t = netdev_priv(dev); 2019 struct __ip6_tnl_parm p; 2020 struct net *net = t->net; 2021 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2022 struct ip_tunnel_encap ipencap; 2023 2024 if (dev == ip6n->fb_tnl_dev) 2025 return -EINVAL; 2026 2027 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 2028 int err = ip6_tnl_encap_setup(t, &ipencap); 2029 2030 if (err < 0) 2031 return err; 2032 } 2033 ip6_tnl_netlink_parms(data, &p); 2034 if (p.collect_md) 2035 return -EINVAL; 2036 2037 t = ip6_tnl_locate(net, &p, 0); 2038 if (!IS_ERR(t)) { 2039 if (t->dev != dev) 2040 return -EEXIST; 2041 } else 2042 t = netdev_priv(dev); 2043 2044 return ip6_tnl_update(t, &p); 2045 } 2046 2047 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) 2048 { 2049 struct net *net = dev_net(dev); 2050 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2051 2052 if (dev != ip6n->fb_tnl_dev) 2053 unregister_netdevice_queue(dev, head); 2054 } 2055 2056 static size_t ip6_tnl_get_size(const struct net_device *dev) 2057 { 2058 return 2059 /* IFLA_IPTUN_LINK */ 2060 nla_total_size(4) + 2061 /* IFLA_IPTUN_LOCAL */ 2062 nla_total_size(sizeof(struct in6_addr)) + 2063 /* IFLA_IPTUN_REMOTE */ 2064 nla_total_size(sizeof(struct in6_addr)) + 2065 /* IFLA_IPTUN_TTL */ 2066 nla_total_size(1) + 2067 /* IFLA_IPTUN_ENCAP_LIMIT */ 2068 nla_total_size(1) + 2069 /* IFLA_IPTUN_FLOWINFO */ 2070 nla_total_size(4) + 2071 /* IFLA_IPTUN_FLAGS */ 2072 nla_total_size(4) + 2073 /* IFLA_IPTUN_PROTO */ 2074 nla_total_size(1) + 2075 /* IFLA_IPTUN_ENCAP_TYPE */ 2076 nla_total_size(2) + 2077 /* IFLA_IPTUN_ENCAP_FLAGS */ 2078 nla_total_size(2) + 2079 /* IFLA_IPTUN_ENCAP_SPORT */ 2080 nla_total_size(2) + 2081 /* IFLA_IPTUN_ENCAP_DPORT */ 2082 nla_total_size(2) + 2083 /* IFLA_IPTUN_COLLECT_METADATA */ 2084 nla_total_size(0) + 2085 /* IFLA_IPTUN_FWMARK */ 2086 nla_total_size(4) + 2087 0; 2088 } 2089 2090 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) 2091 { 2092 struct ip6_tnl *tunnel = netdev_priv(dev); 2093 struct __ip6_tnl_parm *parm = &tunnel->parms; 2094 2095 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 2096 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || 2097 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || 2098 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || 2099 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || 2100 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || 2101 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || 2102 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) || 2103 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark)) 2104 goto nla_put_failure; 2105 2106 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || 2107 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) || 2108 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || 2109 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) 2110 goto nla_put_failure; 2111 2112 if (parm->collect_md) 2113 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) 2114 goto nla_put_failure; 2115 2116 return 0; 2117 2118 nla_put_failure: 2119 return -EMSGSIZE; 2120 } 2121 2122 struct net *ip6_tnl_get_link_net(const struct net_device *dev) 2123 { 2124 struct ip6_tnl *tunnel = netdev_priv(dev); 2125 2126 return tunnel->net; 2127 } 2128 EXPORT_SYMBOL(ip6_tnl_get_link_net); 2129 2130 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { 2131 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 2132 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, 2133 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, 2134 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 2135 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, 2136 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, 2137 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, 2138 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 2139 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 2140 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 2141 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 2142 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 2143 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, 2144 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 2145 }; 2146 2147 static struct rtnl_link_ops ip6_link_ops __read_mostly = { 2148 .kind = "ip6tnl", 2149 .maxtype = IFLA_IPTUN_MAX, 2150 .policy = ip6_tnl_policy, 2151 .priv_size = sizeof(struct ip6_tnl), 2152 .setup = ip6_tnl_dev_setup, 2153 .validate = ip6_tnl_validate, 2154 .newlink = ip6_tnl_newlink, 2155 .changelink = ip6_tnl_changelink, 2156 .dellink = ip6_tnl_dellink, 2157 .get_size = ip6_tnl_get_size, 2158 .fill_info = ip6_tnl_fill_info, 2159 .get_link_net = ip6_tnl_get_link_net, 2160 }; 2161 2162 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { 2163 .handler = ip4ip6_rcv, 2164 .err_handler = ip4ip6_err, 2165 .priority = 1, 2166 }; 2167 2168 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { 2169 .handler = ip6ip6_rcv, 2170 .err_handler = ip6ip6_err, 2171 .priority = 1, 2172 }; 2173 2174 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list) 2175 { 2176 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2177 struct net_device *dev, *aux; 2178 int h; 2179 struct ip6_tnl *t; 2180 2181 for_each_netdev_safe(net, dev, aux) 2182 if (dev->rtnl_link_ops == &ip6_link_ops) 2183 unregister_netdevice_queue(dev, list); 2184 2185 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) { 2186 t = rtnl_dereference(ip6n->tnls_r_l[h]); 2187 while (t) { 2188 /* If dev is in the same netns, it has already 2189 * been added to the list by the previous loop. 2190 */ 2191 if (!net_eq(dev_net(t->dev), net)) 2192 unregister_netdevice_queue(t->dev, list); 2193 t = rtnl_dereference(t->next); 2194 } 2195 } 2196 } 2197 2198 static int __net_init ip6_tnl_init_net(struct net *net) 2199 { 2200 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2201 struct ip6_tnl *t = NULL; 2202 int err; 2203 2204 ip6n->tnls[0] = ip6n->tnls_wc; 2205 ip6n->tnls[1] = ip6n->tnls_r_l; 2206 2207 err = -ENOMEM; 2208 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", 2209 NET_NAME_UNKNOWN, ip6_tnl_dev_setup); 2210 2211 if (!ip6n->fb_tnl_dev) 2212 goto err_alloc_dev; 2213 dev_net_set(ip6n->fb_tnl_dev, net); 2214 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; 2215 /* FB netdevice is special: we have one, and only one per netns. 2216 * Allowing to move it to another netns is clearly unsafe. 2217 */ 2218 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; 2219 2220 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); 2221 if (err < 0) 2222 goto err_register; 2223 2224 err = register_netdev(ip6n->fb_tnl_dev); 2225 if (err < 0) 2226 goto err_register; 2227 2228 t = netdev_priv(ip6n->fb_tnl_dev); 2229 2230 strcpy(t->parms.name, ip6n->fb_tnl_dev->name); 2231 return 0; 2232 2233 err_register: 2234 free_netdev(ip6n->fb_tnl_dev); 2235 err_alloc_dev: 2236 return err; 2237 } 2238 2239 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list) 2240 { 2241 struct net *net; 2242 LIST_HEAD(list); 2243 2244 rtnl_lock(); 2245 list_for_each_entry(net, net_list, exit_list) 2246 ip6_tnl_destroy_tunnels(net, &list); 2247 unregister_netdevice_many(&list); 2248 rtnl_unlock(); 2249 } 2250 2251 static struct pernet_operations ip6_tnl_net_ops = { 2252 .init = ip6_tnl_init_net, 2253 .exit_batch = ip6_tnl_exit_batch_net, 2254 .id = &ip6_tnl_net_id, 2255 .size = sizeof(struct ip6_tnl_net), 2256 }; 2257 2258 /** 2259 * ip6_tunnel_init - register protocol and reserve needed resources 2260 * 2261 * Return: 0 on success 2262 **/ 2263 2264 static int __init ip6_tunnel_init(void) 2265 { 2266 int err; 2267 2268 if (!ipv6_mod_enabled()) 2269 return -EOPNOTSUPP; 2270 2271 err = register_pernet_device(&ip6_tnl_net_ops); 2272 if (err < 0) 2273 goto out_pernet; 2274 2275 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); 2276 if (err < 0) { 2277 pr_err("%s: can't register ip4ip6\n", __func__); 2278 goto out_ip4ip6; 2279 } 2280 2281 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); 2282 if (err < 0) { 2283 pr_err("%s: can't register ip6ip6\n", __func__); 2284 goto out_ip6ip6; 2285 } 2286 err = rtnl_link_register(&ip6_link_ops); 2287 if (err < 0) 2288 goto rtnl_link_failed; 2289 2290 return 0; 2291 2292 rtnl_link_failed: 2293 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); 2294 out_ip6ip6: 2295 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); 2296 out_ip4ip6: 2297 unregister_pernet_device(&ip6_tnl_net_ops); 2298 out_pernet: 2299 return err; 2300 } 2301 2302 /** 2303 * ip6_tunnel_cleanup - free resources and unregister protocol 2304 **/ 2305 2306 static void __exit ip6_tunnel_cleanup(void) 2307 { 2308 rtnl_link_unregister(&ip6_link_ops); 2309 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) 2310 pr_info("%s: can't deregister ip4ip6\n", __func__); 2311 2312 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) 2313 pr_info("%s: can't deregister ip6ip6\n", __func__); 2314 2315 unregister_pernet_device(&ip6_tnl_net_ops); 2316 } 2317 2318 module_init(ip6_tunnel_init); 2319 module_exit(ip6_tunnel_cleanup); 2320