1 /* 2 * IPv6 tunneling device 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Ville Nuorvala <vnuorval@tcs.hut.fi> 7 * Yasuyuki Kozakai <kozakai@linux-ipv6.org> 8 * 9 * Based on: 10 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c 11 * 12 * RFC 2473 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * as published by the Free Software Foundation; either version 17 * 2 of the License, or (at your option) any later version. 18 * 19 */ 20 21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 22 23 #include <linux/module.h> 24 #include <linux/capability.h> 25 #include <linux/errno.h> 26 #include <linux/types.h> 27 #include <linux/sockios.h> 28 #include <linux/icmp.h> 29 #include <linux/if.h> 30 #include <linux/in.h> 31 #include <linux/ip.h> 32 #include <linux/net.h> 33 #include <linux/in6.h> 34 #include <linux/netdevice.h> 35 #include <linux/if_arp.h> 36 #include <linux/icmpv6.h> 37 #include <linux/init.h> 38 #include <linux/route.h> 39 #include <linux/rtnetlink.h> 40 #include <linux/netfilter_ipv6.h> 41 #include <linux/slab.h> 42 #include <linux/hash.h> 43 #include <linux/etherdevice.h> 44 45 #include <asm/uaccess.h> 46 #include <linux/atomic.h> 47 48 #include <net/icmp.h> 49 #include <net/ip.h> 50 #include <net/ip_tunnels.h> 51 #include <net/ipv6.h> 52 #include <net/ip6_route.h> 53 #include <net/addrconf.h> 54 #include <net/ip6_tunnel.h> 55 #include <net/xfrm.h> 56 #include <net/dsfield.h> 57 #include <net/inet_ecn.h> 58 #include <net/net_namespace.h> 59 #include <net/netns/generic.h> 60 #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 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 (t->dev->flags & IFF_UP)) 161 return t; 162 } 163 164 hash = HASH(remote, &any); 165 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 166 if (ipv6_addr_equal(remote, &t->parms.raddr) && 167 (t->dev->flags & IFF_UP)) 168 return t; 169 } 170 171 t = rcu_dereference(ip6n->collect_md_tun); 172 if (t) 173 return t; 174 175 t = rcu_dereference(ip6n->tnls_wc[0]); 176 if (t && (t->dev->flags & IFF_UP)) 177 return t; 178 179 return NULL; 180 } 181 182 /** 183 * ip6_tnl_bucket - get head of list matching given tunnel parameters 184 * @p: parameters containing tunnel end-points 185 * 186 * Description: 187 * ip6_tnl_bucket() returns the head of the list matching the 188 * &struct in6_addr entries laddr and raddr in @p. 189 * 190 * Return: head of IPv6 tunnel list 191 **/ 192 193 static struct ip6_tnl __rcu ** 194 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) 195 { 196 const struct in6_addr *remote = &p->raddr; 197 const struct in6_addr *local = &p->laddr; 198 unsigned int h = 0; 199 int prio = 0; 200 201 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { 202 prio = 1; 203 h = HASH(remote, local); 204 } 205 return &ip6n->tnls[prio][h]; 206 } 207 208 /** 209 * ip6_tnl_link - add tunnel to hash table 210 * @t: tunnel to be added 211 **/ 212 213 static void 214 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 215 { 216 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); 217 218 if (t->parms.collect_md) 219 rcu_assign_pointer(ip6n->collect_md_tun, t); 220 rcu_assign_pointer(t->next , rtnl_dereference(*tp)); 221 rcu_assign_pointer(*tp, t); 222 } 223 224 /** 225 * ip6_tnl_unlink - remove tunnel from hash table 226 * @t: tunnel to be removed 227 **/ 228 229 static void 230 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 231 { 232 struct ip6_tnl __rcu **tp; 233 struct ip6_tnl *iter; 234 235 if (t->parms.collect_md) 236 rcu_assign_pointer(ip6n->collect_md_tun, NULL); 237 238 for (tp = ip6_tnl_bucket(ip6n, &t->parms); 239 (iter = rtnl_dereference(*tp)) != NULL; 240 tp = &iter->next) { 241 if (t == iter) { 242 rcu_assign_pointer(*tp, t->next); 243 break; 244 } 245 } 246 } 247 248 static void ip6_dev_free(struct net_device *dev) 249 { 250 struct ip6_tnl *t = netdev_priv(dev); 251 252 gro_cells_destroy(&t->gro_cells); 253 dst_cache_destroy(&t->dst_cache); 254 free_percpu(dev->tstats); 255 free_netdev(dev); 256 } 257 258 static int ip6_tnl_create2(struct net_device *dev) 259 { 260 struct ip6_tnl *t = netdev_priv(dev); 261 struct net *net = dev_net(dev); 262 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 263 int err; 264 265 t = netdev_priv(dev); 266 267 dev->rtnl_link_ops = &ip6_link_ops; 268 err = register_netdevice(dev); 269 if (err < 0) 270 goto out; 271 272 strcpy(t->parms.name, dev->name); 273 274 dev_hold(dev); 275 ip6_tnl_link(ip6n, t); 276 return 0; 277 278 out: 279 return err; 280 } 281 282 /** 283 * ip6_tnl_create - create a new tunnel 284 * @p: tunnel parameters 285 * @pt: pointer to new tunnel 286 * 287 * Description: 288 * Create tunnel matching given parameters. 289 * 290 * Return: 291 * created tunnel or error pointer 292 **/ 293 294 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) 295 { 296 struct net_device *dev; 297 struct ip6_tnl *t; 298 char name[IFNAMSIZ]; 299 int err = -ENOMEM; 300 301 if (p->name[0]) 302 strlcpy(name, p->name, IFNAMSIZ); 303 else 304 sprintf(name, "ip6tnl%%d"); 305 306 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 307 ip6_tnl_dev_setup); 308 if (!dev) 309 goto failed; 310 311 dev_net_set(dev, net); 312 313 t = netdev_priv(dev); 314 t->parms = *p; 315 t->net = dev_net(dev); 316 err = ip6_tnl_create2(dev); 317 if (err < 0) 318 goto failed_free; 319 320 return t; 321 322 failed_free: 323 ip6_dev_free(dev); 324 failed: 325 return ERR_PTR(err); 326 } 327 328 /** 329 * ip6_tnl_locate - find or create tunnel matching given parameters 330 * @p: tunnel parameters 331 * @create: != 0 if allowed to create new tunnel if no match found 332 * 333 * Description: 334 * ip6_tnl_locate() first tries to locate an existing tunnel 335 * based on @parms. If this is unsuccessful, but @create is set a new 336 * tunnel device is created and registered for use. 337 * 338 * Return: 339 * matching tunnel or error pointer 340 **/ 341 342 static struct ip6_tnl *ip6_tnl_locate(struct net *net, 343 struct __ip6_tnl_parm *p, int create) 344 { 345 const struct in6_addr *remote = &p->raddr; 346 const struct in6_addr *local = &p->laddr; 347 struct ip6_tnl __rcu **tp; 348 struct ip6_tnl *t; 349 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 350 351 for (tp = ip6_tnl_bucket(ip6n, p); 352 (t = rtnl_dereference(*tp)) != NULL; 353 tp = &t->next) { 354 if (ipv6_addr_equal(local, &t->parms.laddr) && 355 ipv6_addr_equal(remote, &t->parms.raddr)) { 356 if (create) 357 return ERR_PTR(-EEXIST); 358 359 return t; 360 } 361 } 362 if (!create) 363 return ERR_PTR(-ENODEV); 364 return ip6_tnl_create(net, p); 365 } 366 367 /** 368 * ip6_tnl_dev_uninit - tunnel device uninitializer 369 * @dev: the device to be destroyed 370 * 371 * Description: 372 * ip6_tnl_dev_uninit() removes tunnel from its list 373 **/ 374 375 static void 376 ip6_tnl_dev_uninit(struct net_device *dev) 377 { 378 struct ip6_tnl *t = netdev_priv(dev); 379 struct net *net = t->net; 380 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 381 382 if (dev == ip6n->fb_tnl_dev) 383 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); 384 else 385 ip6_tnl_unlink(ip6n, t); 386 dst_cache_reset(&t->dst_cache); 387 dev_put(dev); 388 } 389 390 /** 391 * parse_tvl_tnl_enc_lim - handle encapsulation limit option 392 * @skb: received socket buffer 393 * 394 * Return: 395 * 0 if none was found, 396 * else index to encapsulation limit 397 **/ 398 399 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) 400 { 401 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) raw; 402 __u8 nexthdr = ipv6h->nexthdr; 403 __u16 off = sizeof(*ipv6h); 404 405 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { 406 __u16 optlen = 0; 407 struct ipv6_opt_hdr *hdr; 408 if (raw + off + sizeof(*hdr) > skb->data && 409 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) 410 break; 411 412 hdr = (struct ipv6_opt_hdr *) (raw + off); 413 if (nexthdr == NEXTHDR_FRAGMENT) { 414 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; 415 if (frag_hdr->frag_off) 416 break; 417 optlen = 8; 418 } else if (nexthdr == NEXTHDR_AUTH) { 419 optlen = (hdr->hdrlen + 2) << 2; 420 } else { 421 optlen = ipv6_optlen(hdr); 422 } 423 if (nexthdr == NEXTHDR_DEST) { 424 __u16 i = off + 2; 425 while (1) { 426 struct ipv6_tlv_tnl_enc_lim *tel; 427 428 /* No more room for encapsulation limit */ 429 if (i + sizeof (*tel) > off + optlen) 430 break; 431 432 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; 433 /* return index of option if found and valid */ 434 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && 435 tel->length == 1) 436 return i; 437 /* else jump to next option */ 438 if (tel->type) 439 i += tel->length + 2; 440 else 441 i++; 442 } 443 } 444 nexthdr = hdr->nexthdr; 445 off += optlen; 446 } 447 return 0; 448 } 449 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); 450 451 /** 452 * ip6_tnl_err - tunnel error handler 453 * 454 * Description: 455 * ip6_tnl_err() should handle errors in the tunnel according 456 * to the specifications in RFC 2473. 457 **/ 458 459 static int 460 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, 461 u8 *type, u8 *code, int *msg, __u32 *info, int offset) 462 { 463 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *) skb->data; 464 struct ip6_tnl *t; 465 int rel_msg = 0; 466 u8 rel_type = ICMPV6_DEST_UNREACH; 467 u8 rel_code = ICMPV6_ADDR_UNREACH; 468 u8 tproto; 469 __u32 rel_info = 0; 470 __u16 len; 471 int err = -ENOENT; 472 473 /* If the packet doesn't contain the original IPv6 header we are 474 in trouble since we might need the source address for further 475 processing of the error. */ 476 477 rcu_read_lock(); 478 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); 479 if (!t) 480 goto out; 481 482 tproto = ACCESS_ONCE(t->parms.proto); 483 if (tproto != ipproto && tproto != 0) 484 goto out; 485 486 err = 0; 487 488 switch (*type) { 489 __u32 teli; 490 struct ipv6_tlv_tnl_enc_lim *tel; 491 __u32 mtu; 492 case ICMPV6_DEST_UNREACH: 493 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 494 t->parms.name); 495 rel_msg = 1; 496 break; 497 case ICMPV6_TIME_EXCEED: 498 if ((*code) == ICMPV6_EXC_HOPLIMIT) { 499 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 500 t->parms.name); 501 rel_msg = 1; 502 } 503 break; 504 case ICMPV6_PARAMPROB: 505 teli = 0; 506 if ((*code) == ICMPV6_HDR_FIELD) 507 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 508 509 if (teli && teli == *info - 2) { 510 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 511 if (tel->encap_limit == 0) { 512 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 513 t->parms.name); 514 rel_msg = 1; 515 } 516 } else { 517 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 518 t->parms.name); 519 } 520 break; 521 case ICMPV6_PKT_TOOBIG: 522 mtu = *info - offset; 523 if (mtu < IPV6_MIN_MTU) 524 mtu = IPV6_MIN_MTU; 525 t->dev->mtu = mtu; 526 527 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); 528 if (len > mtu) { 529 rel_type = ICMPV6_PKT_TOOBIG; 530 rel_code = 0; 531 rel_info = mtu; 532 rel_msg = 1; 533 } 534 break; 535 } 536 537 *type = rel_type; 538 *code = rel_code; 539 *info = rel_info; 540 *msg = rel_msg; 541 542 out: 543 rcu_read_unlock(); 544 return err; 545 } 546 547 static int 548 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 549 u8 type, u8 code, int offset, __be32 info) 550 { 551 int rel_msg = 0; 552 u8 rel_type = type; 553 u8 rel_code = code; 554 __u32 rel_info = ntohl(info); 555 int err; 556 struct sk_buff *skb2; 557 const struct iphdr *eiph; 558 struct rtable *rt; 559 struct flowi4 fl4; 560 561 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, 562 &rel_msg, &rel_info, offset); 563 if (err < 0) 564 return err; 565 566 if (rel_msg == 0) 567 return 0; 568 569 switch (rel_type) { 570 case ICMPV6_DEST_UNREACH: 571 if (rel_code != ICMPV6_ADDR_UNREACH) 572 return 0; 573 rel_type = ICMP_DEST_UNREACH; 574 rel_code = ICMP_HOST_UNREACH; 575 break; 576 case ICMPV6_PKT_TOOBIG: 577 if (rel_code != 0) 578 return 0; 579 rel_type = ICMP_DEST_UNREACH; 580 rel_code = ICMP_FRAG_NEEDED; 581 break; 582 case NDISC_REDIRECT: 583 rel_type = ICMP_REDIRECT; 584 rel_code = ICMP_REDIR_HOST; 585 default: 586 return 0; 587 } 588 589 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) 590 return 0; 591 592 skb2 = skb_clone(skb, GFP_ATOMIC); 593 if (!skb2) 594 return 0; 595 596 skb_dst_drop(skb2); 597 598 skb_pull(skb2, offset); 599 skb_reset_network_header(skb2); 600 eiph = ip_hdr(skb2); 601 602 /* Try to guess incoming interface */ 603 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, 604 eiph->saddr, 0, 605 0, 0, 606 IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 607 if (IS_ERR(rt)) 608 goto out; 609 610 skb2->dev = rt->dst.dev; 611 612 /* route "incoming" packet */ 613 if (rt->rt_flags & RTCF_LOCAL) { 614 ip_rt_put(rt); 615 rt = NULL; 616 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, 617 eiph->daddr, eiph->saddr, 618 0, 0, 619 IPPROTO_IPIP, 620 RT_TOS(eiph->tos), 0); 621 if (IS_ERR(rt) || 622 rt->dst.dev->type != ARPHRD_TUNNEL) { 623 if (!IS_ERR(rt)) 624 ip_rt_put(rt); 625 goto out; 626 } 627 skb_dst_set(skb2, &rt->dst); 628 } else { 629 ip_rt_put(rt); 630 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, 631 skb2->dev) || 632 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) 633 goto out; 634 } 635 636 /* change mtu on this route */ 637 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { 638 if (rel_info > dst_mtu(skb_dst(skb2))) 639 goto out; 640 641 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, rel_info); 642 } 643 if (rel_type == ICMP_REDIRECT) 644 skb_dst(skb2)->ops->redirect(skb_dst(skb2), NULL, skb2); 645 646 icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); 647 648 out: 649 kfree_skb(skb2); 650 return 0; 651 } 652 653 static int 654 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 655 u8 type, u8 code, int offset, __be32 info) 656 { 657 int rel_msg = 0; 658 u8 rel_type = type; 659 u8 rel_code = code; 660 __u32 rel_info = ntohl(info); 661 int err; 662 663 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, 664 &rel_msg, &rel_info, offset); 665 if (err < 0) 666 return err; 667 668 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { 669 struct rt6_info *rt; 670 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 671 672 if (!skb2) 673 return 0; 674 675 skb_dst_drop(skb2); 676 skb_pull(skb2, offset); 677 skb_reset_network_header(skb2); 678 679 /* Try to guess incoming interface */ 680 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, 681 NULL, 0, 0); 682 683 if (rt && rt->dst.dev) 684 skb2->dev = rt->dst.dev; 685 686 icmpv6_send(skb2, rel_type, rel_code, rel_info); 687 688 ip6_rt_put(rt); 689 690 kfree_skb(skb2); 691 } 692 693 return 0; 694 } 695 696 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 697 const struct ipv6hdr *ipv6h, 698 struct sk_buff *skb) 699 { 700 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; 701 702 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 703 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); 704 705 return IP6_ECN_decapsulate(ipv6h, skb); 706 } 707 708 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 709 const struct ipv6hdr *ipv6h, 710 struct sk_buff *skb) 711 { 712 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 713 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); 714 715 return IP6_ECN_decapsulate(ipv6h, skb); 716 } 717 718 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, 719 const struct in6_addr *laddr, 720 const struct in6_addr *raddr) 721 { 722 struct __ip6_tnl_parm *p = &t->parms; 723 int ltype = ipv6_addr_type(laddr); 724 int rtype = ipv6_addr_type(raddr); 725 __u32 flags = 0; 726 727 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { 728 flags = IP6_TNL_F_CAP_PER_PACKET; 729 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 730 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 731 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && 732 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { 733 if (ltype&IPV6_ADDR_UNICAST) 734 flags |= IP6_TNL_F_CAP_XMIT; 735 if (rtype&IPV6_ADDR_UNICAST) 736 flags |= IP6_TNL_F_CAP_RCV; 737 } 738 return flags; 739 } 740 EXPORT_SYMBOL(ip6_tnl_get_cap); 741 742 /* called with rcu_read_lock() */ 743 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, 744 const struct in6_addr *laddr, 745 const struct in6_addr *raddr) 746 { 747 struct __ip6_tnl_parm *p = &t->parms; 748 int ret = 0; 749 struct net *net = t->net; 750 751 if ((p->flags & IP6_TNL_F_CAP_RCV) || 752 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 753 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { 754 struct net_device *ldev = NULL; 755 756 if (p->link) 757 ldev = dev_get_by_index_rcu(net, p->link); 758 759 if ((ipv6_addr_is_multicast(laddr) || 760 likely(ipv6_chk_addr(net, laddr, ldev, 0))) && 761 likely(!ipv6_chk_addr(net, raddr, NULL, 0))) 762 ret = 1; 763 } 764 return ret; 765 } 766 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); 767 768 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 769 const struct tnl_ptk_info *tpi, 770 struct metadata_dst *tun_dst, 771 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 772 const struct ipv6hdr *ipv6h, 773 struct sk_buff *skb), 774 bool log_ecn_err) 775 { 776 struct pcpu_sw_netstats *tstats; 777 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 778 int err; 779 780 if ((!(tpi->flags & TUNNEL_CSUM) && 781 (tunnel->parms.i_flags & TUNNEL_CSUM)) || 782 ((tpi->flags & TUNNEL_CSUM) && 783 !(tunnel->parms.i_flags & TUNNEL_CSUM))) { 784 tunnel->dev->stats.rx_crc_errors++; 785 tunnel->dev->stats.rx_errors++; 786 goto drop; 787 } 788 789 if (tunnel->parms.i_flags & TUNNEL_SEQ) { 790 if (!(tpi->flags & TUNNEL_SEQ) || 791 (tunnel->i_seqno && 792 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { 793 tunnel->dev->stats.rx_fifo_errors++; 794 tunnel->dev->stats.rx_errors++; 795 goto drop; 796 } 797 tunnel->i_seqno = ntohl(tpi->seq) + 1; 798 } 799 800 skb->protocol = tpi->proto; 801 802 /* Warning: All skb pointers will be invalidated! */ 803 if (tunnel->dev->type == ARPHRD_ETHER) { 804 if (!pskb_may_pull(skb, ETH_HLEN)) { 805 tunnel->dev->stats.rx_length_errors++; 806 tunnel->dev->stats.rx_errors++; 807 goto drop; 808 } 809 810 ipv6h = ipv6_hdr(skb); 811 skb->protocol = eth_type_trans(skb, tunnel->dev); 812 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 813 } else { 814 skb->dev = tunnel->dev; 815 } 816 817 skb_reset_network_header(skb); 818 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 819 820 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); 821 822 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); 823 if (unlikely(err)) { 824 if (log_ecn_err) 825 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", 826 &ipv6h->saddr, 827 ipv6_get_dsfield(ipv6h)); 828 if (err > 1) { 829 ++tunnel->dev->stats.rx_frame_errors; 830 ++tunnel->dev->stats.rx_errors; 831 goto drop; 832 } 833 } 834 835 tstats = this_cpu_ptr(tunnel->dev->tstats); 836 u64_stats_update_begin(&tstats->syncp); 837 tstats->rx_packets++; 838 tstats->rx_bytes += skb->len; 839 u64_stats_update_end(&tstats->syncp); 840 841 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); 842 843 if (tun_dst) 844 skb_dst_set(skb, (struct dst_entry *)tun_dst); 845 846 gro_cells_receive(&tunnel->gro_cells, skb); 847 return 0; 848 849 drop: 850 kfree_skb(skb); 851 return 0; 852 } 853 854 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, 855 const struct tnl_ptk_info *tpi, 856 struct metadata_dst *tun_dst, 857 bool log_ecn_err) 858 { 859 return __ip6_tnl_rcv(t, skb, tpi, NULL, ip6ip6_dscp_ecn_decapsulate, 860 log_ecn_err); 861 } 862 EXPORT_SYMBOL(ip6_tnl_rcv); 863 864 static const struct tnl_ptk_info tpi_v6 = { 865 /* no tunnel info required for ipxip6. */ 866 .proto = htons(ETH_P_IPV6), 867 }; 868 869 static const struct tnl_ptk_info tpi_v4 = { 870 /* no tunnel info required for ipxip6. */ 871 .proto = htons(ETH_P_IP), 872 }; 873 874 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, 875 const struct tnl_ptk_info *tpi, 876 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 877 const struct ipv6hdr *ipv6h, 878 struct sk_buff *skb)) 879 { 880 struct ip6_tnl *t; 881 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 882 struct metadata_dst *tun_dst = NULL; 883 int ret = -1; 884 885 rcu_read_lock(); 886 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); 887 888 if (t) { 889 u8 tproto = ACCESS_ONCE(t->parms.proto); 890 891 if (tproto != ipproto && tproto != 0) 892 goto drop; 893 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 894 goto drop; 895 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) 896 goto drop; 897 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 898 goto drop; 899 if (t->parms.collect_md) { 900 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0); 901 if (!tun_dst) 902 return 0; 903 } 904 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, 905 log_ecn_error); 906 } 907 908 rcu_read_unlock(); 909 910 return ret; 911 912 drop: 913 rcu_read_unlock(); 914 kfree_skb(skb); 915 return 0; 916 } 917 918 static int ip4ip6_rcv(struct sk_buff *skb) 919 { 920 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4, 921 ip4ip6_dscp_ecn_decapsulate); 922 } 923 924 static int ip6ip6_rcv(struct sk_buff *skb) 925 { 926 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, 927 ip6ip6_dscp_ecn_decapsulate); 928 } 929 930 struct ipv6_tel_txoption { 931 struct ipv6_txoptions ops; 932 __u8 dst_opt[8]; 933 }; 934 935 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) 936 { 937 memset(opt, 0, sizeof(struct ipv6_tel_txoption)); 938 939 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; 940 opt->dst_opt[3] = 1; 941 opt->dst_opt[4] = encap_limit; 942 opt->dst_opt[5] = IPV6_TLV_PADN; 943 opt->dst_opt[6] = 1; 944 945 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; 946 opt->ops.opt_nflen = 8; 947 } 948 949 /** 950 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 951 * @t: the outgoing tunnel device 952 * @hdr: IPv6 header from the incoming packet 953 * 954 * Description: 955 * Avoid trivial tunneling loop by checking that tunnel exit-point 956 * doesn't match source of incoming packet. 957 * 958 * Return: 959 * 1 if conflict, 960 * 0 else 961 **/ 962 963 static inline bool 964 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) 965 { 966 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 967 } 968 969 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, 970 const struct in6_addr *laddr, 971 const struct in6_addr *raddr) 972 { 973 struct __ip6_tnl_parm *p = &t->parms; 974 int ret = 0; 975 struct net *net = t->net; 976 977 if ((p->flags & IP6_TNL_F_CAP_XMIT) || 978 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 979 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { 980 struct net_device *ldev = NULL; 981 982 rcu_read_lock(); 983 if (p->link) 984 ldev = dev_get_by_index_rcu(net, p->link); 985 986 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) 987 pr_warn("%s xmit: Local address not yet configured!\n", 988 p->name); 989 else if (!ipv6_addr_is_multicast(raddr) && 990 unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) 991 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", 992 p->name); 993 else 994 ret = 1; 995 rcu_read_unlock(); 996 } 997 return ret; 998 } 999 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); 1000 1001 /** 1002 * ip6_tnl_xmit - encapsulate packet and send 1003 * @skb: the outgoing socket buffer 1004 * @dev: the outgoing tunnel device 1005 * @dsfield: dscp code for outer header 1006 * @fl6: flow of tunneled packet 1007 * @encap_limit: encapsulation limit 1008 * @pmtu: Path MTU is stored if packet is too big 1009 * @proto: next header value 1010 * 1011 * Description: 1012 * Build new header and do some sanity checks on the packet before sending 1013 * it. 1014 * 1015 * Return: 1016 * 0 on success 1017 * -1 fail 1018 * %-EMSGSIZE message too big. return mtu in this case. 1019 **/ 1020 1021 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 1022 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, 1023 __u8 proto) 1024 { 1025 struct ip6_tnl *t = netdev_priv(dev); 1026 struct net *net = t->net; 1027 struct net_device_stats *stats = &t->dev->stats; 1028 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 1029 struct ipv6_tel_txoption opt; 1030 struct dst_entry *dst = NULL, *ndst = NULL; 1031 struct net_device *tdev; 1032 int mtu; 1033 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; 1034 unsigned int max_headroom = psh_hlen; 1035 u8 hop_limit; 1036 int err = -1; 1037 1038 if (t->parms.collect_md) { 1039 hop_limit = skb_tunnel_info(skb)->key.ttl; 1040 goto route_lookup; 1041 } else { 1042 hop_limit = t->parms.hop_limit; 1043 } 1044 1045 /* NBMA tunnel */ 1046 if (ipv6_addr_any(&t->parms.raddr)) { 1047 struct in6_addr *addr6; 1048 struct neighbour *neigh; 1049 int addr_type; 1050 1051 if (!skb_dst(skb)) 1052 goto tx_err_link_failure; 1053 1054 neigh = dst_neigh_lookup(skb_dst(skb), 1055 &ipv6_hdr(skb)->daddr); 1056 if (!neigh) 1057 goto tx_err_link_failure; 1058 1059 addr6 = (struct in6_addr *)&neigh->primary_key; 1060 addr_type = ipv6_addr_type(addr6); 1061 1062 if (addr_type == IPV6_ADDR_ANY) 1063 addr6 = &ipv6_hdr(skb)->daddr; 1064 1065 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); 1066 neigh_release(neigh); 1067 } else if (!fl6->flowi6_mark) 1068 dst = dst_cache_get(&t->dst_cache); 1069 1070 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) 1071 goto tx_err_link_failure; 1072 1073 if (!dst) { 1074 route_lookup: 1075 dst = ip6_route_output(net, NULL, fl6); 1076 1077 if (dst->error) 1078 goto tx_err_link_failure; 1079 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); 1080 if (IS_ERR(dst)) { 1081 err = PTR_ERR(dst); 1082 dst = NULL; 1083 goto tx_err_link_failure; 1084 } 1085 if (t->parms.collect_md && 1086 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, 1087 &fl6->daddr, 0, &fl6->saddr)) 1088 goto tx_err_link_failure; 1089 ndst = dst; 1090 } 1091 1092 tdev = dst->dev; 1093 1094 if (tdev == dev) { 1095 stats->collisions++; 1096 net_warn_ratelimited("%s: Local routing loop detected!\n", 1097 t->parms.name); 1098 goto tx_err_dst_release; 1099 } 1100 mtu = dst_mtu(dst) - psh_hlen; 1101 if (encap_limit >= 0) { 1102 max_headroom += 8; 1103 mtu -= 8; 1104 } 1105 if (mtu < IPV6_MIN_MTU) 1106 mtu = IPV6_MIN_MTU; 1107 if (skb_dst(skb) && !t->parms.collect_md) 1108 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 1109 if (skb->len > mtu && !skb_is_gso(skb)) { 1110 *pmtu = mtu; 1111 err = -EMSGSIZE; 1112 goto tx_err_dst_release; 1113 } 1114 1115 if (t->err_count > 0) { 1116 if (time_before(jiffies, 1117 t->err_time + IP6TUNNEL_ERR_TIMEO)) { 1118 t->err_count--; 1119 1120 dst_link_failure(skb); 1121 } else { 1122 t->err_count = 0; 1123 } 1124 } 1125 1126 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); 1127 1128 /* 1129 * Okay, now see if we can stuff it in the buffer as-is. 1130 */ 1131 max_headroom += LL_RESERVED_SPACE(tdev); 1132 1133 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1134 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1135 struct sk_buff *new_skb; 1136 1137 new_skb = skb_realloc_headroom(skb, max_headroom); 1138 if (!new_skb) 1139 goto tx_err_dst_release; 1140 1141 if (skb->sk) 1142 skb_set_owner_w(new_skb, skb->sk); 1143 consume_skb(skb); 1144 skb = new_skb; 1145 } 1146 1147 if (t->parms.collect_md) { 1148 if (t->encap.type != TUNNEL_ENCAP_NONE) 1149 goto tx_err_dst_release; 1150 } else { 1151 if (!fl6->flowi6_mark && ndst) 1152 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); 1153 } 1154 skb_dst_set(skb, dst); 1155 1156 if (encap_limit >= 0) { 1157 init_tel_txopt(&opt, encap_limit); 1158 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); 1159 } 1160 1161 /* Calculate max headroom for all the headers and adjust 1162 * needed_headroom if necessary. 1163 */ 1164 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) 1165 + dst->header_len + t->hlen; 1166 if (max_headroom > dev->needed_headroom) 1167 dev->needed_headroom = max_headroom; 1168 1169 err = ip6_tnl_encap(skb, t, &proto, fl6); 1170 if (err) 1171 return err; 1172 1173 skb_push(skb, sizeof(struct ipv6hdr)); 1174 skb_reset_network_header(skb); 1175 ipv6h = ipv6_hdr(skb); 1176 ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), 1177 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); 1178 ipv6h->hop_limit = hop_limit; 1179 ipv6h->nexthdr = proto; 1180 ipv6h->saddr = fl6->saddr; 1181 ipv6h->daddr = fl6->daddr; 1182 ip6tunnel_xmit(NULL, skb, dev); 1183 return 0; 1184 tx_err_link_failure: 1185 stats->tx_carrier_errors++; 1186 dst_link_failure(skb); 1187 tx_err_dst_release: 1188 dst_release(dst); 1189 return err; 1190 } 1191 EXPORT_SYMBOL(ip6_tnl_xmit); 1192 1193 static inline int 1194 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1195 { 1196 struct ip6_tnl *t = netdev_priv(dev); 1197 const struct iphdr *iph = ip_hdr(skb); 1198 int encap_limit = -1; 1199 struct flowi6 fl6; 1200 __u8 dsfield; 1201 __u32 mtu; 1202 u8 tproto; 1203 int err; 1204 1205 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1206 1207 tproto = ACCESS_ONCE(t->parms.proto); 1208 if (tproto != IPPROTO_IPIP && tproto != 0) 1209 return -1; 1210 1211 dsfield = ipv4_get_dsfield(iph); 1212 1213 if (t->parms.collect_md) { 1214 struct ip_tunnel_info *tun_info; 1215 const struct ip_tunnel_key *key; 1216 1217 tun_info = skb_tunnel_info(skb); 1218 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1219 ip_tunnel_info_af(tun_info) != AF_INET6)) 1220 return -1; 1221 key = &tun_info->key; 1222 memset(&fl6, 0, sizeof(fl6)); 1223 fl6.flowi6_proto = IPPROTO_IPIP; 1224 fl6.daddr = key->u.ipv6.dst; 1225 fl6.flowlabel = key->label; 1226 } else { 1227 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1228 encap_limit = t->parms.encap_limit; 1229 1230 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1231 fl6.flowi6_proto = IPPROTO_IPIP; 1232 1233 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1234 fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) 1235 & IPV6_TCLASS_MASK; 1236 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1237 fl6.flowi6_mark = skb->mark; 1238 } 1239 1240 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1241 return -1; 1242 1243 skb_set_inner_ipproto(skb, IPPROTO_IPIP); 1244 1245 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1246 IPPROTO_IPIP); 1247 if (err != 0) { 1248 /* XXX: send ICMP error even if DF is not set. */ 1249 if (err == -EMSGSIZE) 1250 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 1251 htonl(mtu)); 1252 return -1; 1253 } 1254 1255 return 0; 1256 } 1257 1258 static inline int 1259 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1260 { 1261 struct ip6_tnl *t = netdev_priv(dev); 1262 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 1263 int encap_limit = -1; 1264 __u16 offset; 1265 struct flowi6 fl6; 1266 __u8 dsfield; 1267 __u32 mtu; 1268 u8 tproto; 1269 int err; 1270 1271 tproto = ACCESS_ONCE(t->parms.proto); 1272 if ((tproto != IPPROTO_IPV6 && tproto != 0) || 1273 ip6_tnl_addr_conflict(t, ipv6h)) 1274 return -1; 1275 1276 dsfield = ipv6_get_dsfield(ipv6h); 1277 1278 if (t->parms.collect_md) { 1279 struct ip_tunnel_info *tun_info; 1280 const struct ip_tunnel_key *key; 1281 1282 tun_info = skb_tunnel_info(skb); 1283 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1284 ip_tunnel_info_af(tun_info) != AF_INET6)) 1285 return -1; 1286 key = &tun_info->key; 1287 memset(&fl6, 0, sizeof(fl6)); 1288 fl6.flowi6_proto = IPPROTO_IPV6; 1289 fl6.daddr = key->u.ipv6.dst; 1290 fl6.flowlabel = key->label; 1291 } else { 1292 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 1293 if (offset > 0) { 1294 struct ipv6_tlv_tnl_enc_lim *tel; 1295 1296 tel = (void *)&skb_network_header(skb)[offset]; 1297 if (tel->encap_limit == 0) { 1298 icmpv6_send(skb, ICMPV6_PARAMPROB, 1299 ICMPV6_HDR_FIELD, offset + 2); 1300 return -1; 1301 } 1302 encap_limit = tel->encap_limit - 1; 1303 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 1304 encap_limit = t->parms.encap_limit; 1305 } 1306 1307 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1308 fl6.flowi6_proto = IPPROTO_IPV6; 1309 1310 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1311 fl6.flowlabel |= (*(__be32 *)ipv6h & IPV6_TCLASS_MASK); 1312 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 1313 fl6.flowlabel |= ip6_flowlabel(ipv6h); 1314 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1315 fl6.flowi6_mark = skb->mark; 1316 } 1317 1318 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1319 return -1; 1320 1321 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1322 1323 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1324 IPPROTO_IPV6); 1325 if (err != 0) { 1326 if (err == -EMSGSIZE) 1327 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1328 return -1; 1329 } 1330 1331 return 0; 1332 } 1333 1334 static netdev_tx_t 1335 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) 1336 { 1337 struct ip6_tnl *t = netdev_priv(dev); 1338 struct net_device_stats *stats = &t->dev->stats; 1339 int ret; 1340 1341 switch (skb->protocol) { 1342 case htons(ETH_P_IP): 1343 ret = ip4ip6_tnl_xmit(skb, dev); 1344 break; 1345 case htons(ETH_P_IPV6): 1346 ret = ip6ip6_tnl_xmit(skb, dev); 1347 break; 1348 default: 1349 goto tx_err; 1350 } 1351 1352 if (ret < 0) 1353 goto tx_err; 1354 1355 return NETDEV_TX_OK; 1356 1357 tx_err: 1358 stats->tx_errors++; 1359 stats->tx_dropped++; 1360 kfree_skb(skb); 1361 return NETDEV_TX_OK; 1362 } 1363 1364 static void ip6_tnl_link_config(struct ip6_tnl *t) 1365 { 1366 struct net_device *dev = t->dev; 1367 struct __ip6_tnl_parm *p = &t->parms; 1368 struct flowi6 *fl6 = &t->fl.u.ip6; 1369 int t_hlen; 1370 1371 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1372 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1373 1374 /* Set up flowi template */ 1375 fl6->saddr = p->laddr; 1376 fl6->daddr = p->raddr; 1377 fl6->flowi6_oif = p->link; 1378 fl6->flowlabel = 0; 1379 1380 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1381 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1382 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1383 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1384 1385 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1386 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1387 1388 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) 1389 dev->flags |= IFF_POINTOPOINT; 1390 else 1391 dev->flags &= ~IFF_POINTOPOINT; 1392 1393 t->tun_hlen = 0; 1394 t->hlen = t->encap_hlen + t->tun_hlen; 1395 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1396 1397 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1398 int strict = (ipv6_addr_type(&p->raddr) & 1399 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1400 1401 struct rt6_info *rt = rt6_lookup(t->net, 1402 &p->raddr, &p->laddr, 1403 p->link, strict); 1404 1405 if (!rt) 1406 return; 1407 1408 if (rt->dst.dev) { 1409 dev->hard_header_len = rt->dst.dev->hard_header_len + 1410 t_hlen; 1411 1412 dev->mtu = rt->dst.dev->mtu - t_hlen; 1413 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1414 dev->mtu -= 8; 1415 1416 if (dev->mtu < IPV6_MIN_MTU) 1417 dev->mtu = IPV6_MIN_MTU; 1418 } 1419 ip6_rt_put(rt); 1420 } 1421 } 1422 1423 /** 1424 * ip6_tnl_change - update the tunnel parameters 1425 * @t: tunnel to be changed 1426 * @p: tunnel configuration parameters 1427 * 1428 * Description: 1429 * ip6_tnl_change() updates the tunnel parameters 1430 **/ 1431 1432 static int 1433 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) 1434 { 1435 t->parms.laddr = p->laddr; 1436 t->parms.raddr = p->raddr; 1437 t->parms.flags = p->flags; 1438 t->parms.hop_limit = p->hop_limit; 1439 t->parms.encap_limit = p->encap_limit; 1440 t->parms.flowinfo = p->flowinfo; 1441 t->parms.link = p->link; 1442 t->parms.proto = p->proto; 1443 dst_cache_reset(&t->dst_cache); 1444 ip6_tnl_link_config(t); 1445 return 0; 1446 } 1447 1448 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1449 { 1450 struct net *net = t->net; 1451 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1452 int err; 1453 1454 ip6_tnl_unlink(ip6n, t); 1455 synchronize_net(); 1456 err = ip6_tnl_change(t, p); 1457 ip6_tnl_link(ip6n, t); 1458 netdev_state_change(t->dev); 1459 return err; 1460 } 1461 1462 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1463 { 1464 /* for default tnl0 device allow to change only the proto */ 1465 t->parms.proto = p->proto; 1466 netdev_state_change(t->dev); 1467 return 0; 1468 } 1469 1470 static void 1471 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) 1472 { 1473 p->laddr = u->laddr; 1474 p->raddr = u->raddr; 1475 p->flags = u->flags; 1476 p->hop_limit = u->hop_limit; 1477 p->encap_limit = u->encap_limit; 1478 p->flowinfo = u->flowinfo; 1479 p->link = u->link; 1480 p->proto = u->proto; 1481 memcpy(p->name, u->name, sizeof(u->name)); 1482 } 1483 1484 static void 1485 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) 1486 { 1487 u->laddr = p->laddr; 1488 u->raddr = p->raddr; 1489 u->flags = p->flags; 1490 u->hop_limit = p->hop_limit; 1491 u->encap_limit = p->encap_limit; 1492 u->flowinfo = p->flowinfo; 1493 u->link = p->link; 1494 u->proto = p->proto; 1495 memcpy(u->name, p->name, sizeof(u->name)); 1496 } 1497 1498 /** 1499 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace 1500 * @dev: virtual device associated with tunnel 1501 * @ifr: parameters passed from userspace 1502 * @cmd: command to be performed 1503 * 1504 * Description: 1505 * ip6_tnl_ioctl() is used for managing IPv6 tunnels 1506 * from userspace. 1507 * 1508 * The possible commands are the following: 1509 * %SIOCGETTUNNEL: get tunnel parameters for device 1510 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 1511 * %SIOCCHGTUNNEL: change tunnel parameters to those given 1512 * %SIOCDELTUNNEL: delete tunnel 1513 * 1514 * The fallback device "ip6tnl0", created during module 1515 * initialization, can be used for creating other tunnel devices. 1516 * 1517 * Return: 1518 * 0 on success, 1519 * %-EFAULT if unable to copy data to or from userspace, 1520 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 1521 * %-EINVAL if passed tunnel parameters are invalid, 1522 * %-EEXIST if changing a tunnel's parameters would cause a conflict 1523 * %-ENODEV if attempting to change or delete a nonexisting device 1524 **/ 1525 1526 static int 1527 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1528 { 1529 int err = 0; 1530 struct ip6_tnl_parm p; 1531 struct __ip6_tnl_parm p1; 1532 struct ip6_tnl *t = netdev_priv(dev); 1533 struct net *net = t->net; 1534 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1535 1536 memset(&p1, 0, sizeof(p1)); 1537 1538 switch (cmd) { 1539 case SIOCGETTUNNEL: 1540 if (dev == ip6n->fb_tnl_dev) { 1541 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1542 err = -EFAULT; 1543 break; 1544 } 1545 ip6_tnl_parm_from_user(&p1, &p); 1546 t = ip6_tnl_locate(net, &p1, 0); 1547 if (IS_ERR(t)) 1548 t = netdev_priv(dev); 1549 } else { 1550 memset(&p, 0, sizeof(p)); 1551 } 1552 ip6_tnl_parm_to_user(&p, &t->parms); 1553 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { 1554 err = -EFAULT; 1555 } 1556 break; 1557 case SIOCADDTUNNEL: 1558 case SIOCCHGTUNNEL: 1559 err = -EPERM; 1560 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1561 break; 1562 err = -EFAULT; 1563 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1564 break; 1565 err = -EINVAL; 1566 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 1567 p.proto != 0) 1568 break; 1569 ip6_tnl_parm_from_user(&p1, &p); 1570 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); 1571 if (cmd == SIOCCHGTUNNEL) { 1572 if (!IS_ERR(t)) { 1573 if (t->dev != dev) { 1574 err = -EEXIST; 1575 break; 1576 } 1577 } else 1578 t = netdev_priv(dev); 1579 if (dev == ip6n->fb_tnl_dev) 1580 err = ip6_tnl0_update(t, &p1); 1581 else 1582 err = ip6_tnl_update(t, &p1); 1583 } 1584 if (!IS_ERR(t)) { 1585 err = 0; 1586 ip6_tnl_parm_to_user(&p, &t->parms); 1587 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1588 err = -EFAULT; 1589 1590 } else { 1591 err = PTR_ERR(t); 1592 } 1593 break; 1594 case SIOCDELTUNNEL: 1595 err = -EPERM; 1596 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1597 break; 1598 1599 if (dev == ip6n->fb_tnl_dev) { 1600 err = -EFAULT; 1601 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1602 break; 1603 err = -ENOENT; 1604 ip6_tnl_parm_from_user(&p1, &p); 1605 t = ip6_tnl_locate(net, &p1, 0); 1606 if (IS_ERR(t)) 1607 break; 1608 err = -EPERM; 1609 if (t->dev == ip6n->fb_tnl_dev) 1610 break; 1611 dev = t->dev; 1612 } 1613 err = 0; 1614 unregister_netdevice(dev); 1615 break; 1616 default: 1617 err = -EINVAL; 1618 } 1619 return err; 1620 } 1621 1622 /** 1623 * ip6_tnl_change_mtu - change mtu manually for tunnel device 1624 * @dev: virtual device associated with tunnel 1625 * @new_mtu: the new mtu 1626 * 1627 * Return: 1628 * 0 on success, 1629 * %-EINVAL if mtu too small 1630 **/ 1631 1632 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) 1633 { 1634 struct ip6_tnl *tnl = netdev_priv(dev); 1635 1636 if (tnl->parms.proto == IPPROTO_IPIP) { 1637 if (new_mtu < 68) 1638 return -EINVAL; 1639 } else { 1640 if (new_mtu < IPV6_MIN_MTU) 1641 return -EINVAL; 1642 } 1643 if (new_mtu > 0xFFF8 - dev->hard_header_len) 1644 return -EINVAL; 1645 dev->mtu = new_mtu; 1646 return 0; 1647 } 1648 EXPORT_SYMBOL(ip6_tnl_change_mtu); 1649 1650 int ip6_tnl_get_iflink(const struct net_device *dev) 1651 { 1652 struct ip6_tnl *t = netdev_priv(dev); 1653 1654 return t->parms.link; 1655 } 1656 EXPORT_SYMBOL(ip6_tnl_get_iflink); 1657 1658 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 1659 unsigned int num) 1660 { 1661 if (num >= MAX_IPTUN_ENCAP_OPS) 1662 return -ERANGE; 1663 1664 return !cmpxchg((const struct ip6_tnl_encap_ops **) 1665 &ip6tun_encaps[num], 1666 NULL, ops) ? 0 : -1; 1667 } 1668 EXPORT_SYMBOL(ip6_tnl_encap_add_ops); 1669 1670 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 1671 unsigned int num) 1672 { 1673 int ret; 1674 1675 if (num >= MAX_IPTUN_ENCAP_OPS) 1676 return -ERANGE; 1677 1678 ret = (cmpxchg((const struct ip6_tnl_encap_ops **) 1679 &ip6tun_encaps[num], 1680 ops, NULL) == ops) ? 0 : -1; 1681 1682 synchronize_net(); 1683 1684 return ret; 1685 } 1686 EXPORT_SYMBOL(ip6_tnl_encap_del_ops); 1687 1688 int ip6_tnl_encap_setup(struct ip6_tnl *t, 1689 struct ip_tunnel_encap *ipencap) 1690 { 1691 int hlen; 1692 1693 memset(&t->encap, 0, sizeof(t->encap)); 1694 1695 hlen = ip6_encap_hlen(ipencap); 1696 if (hlen < 0) 1697 return hlen; 1698 1699 t->encap.type = ipencap->type; 1700 t->encap.sport = ipencap->sport; 1701 t->encap.dport = ipencap->dport; 1702 t->encap.flags = ipencap->flags; 1703 1704 t->encap_hlen = hlen; 1705 t->hlen = t->encap_hlen + t->tun_hlen; 1706 1707 return 0; 1708 } 1709 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); 1710 1711 static const struct net_device_ops ip6_tnl_netdev_ops = { 1712 .ndo_init = ip6_tnl_dev_init, 1713 .ndo_uninit = ip6_tnl_dev_uninit, 1714 .ndo_start_xmit = ip6_tnl_start_xmit, 1715 .ndo_do_ioctl = ip6_tnl_ioctl, 1716 .ndo_change_mtu = ip6_tnl_change_mtu, 1717 .ndo_get_stats = ip6_get_stats, 1718 .ndo_get_iflink = ip6_tnl_get_iflink, 1719 }; 1720 1721 #define IPXIPX_FEATURES (NETIF_F_SG | \ 1722 NETIF_F_FRAGLIST | \ 1723 NETIF_F_HIGHDMA | \ 1724 NETIF_F_GSO_SOFTWARE | \ 1725 NETIF_F_HW_CSUM) 1726 1727 /** 1728 * ip6_tnl_dev_setup - setup virtual tunnel device 1729 * @dev: virtual device associated with tunnel 1730 * 1731 * Description: 1732 * Initialize function pointers and device parameters 1733 **/ 1734 1735 static void ip6_tnl_dev_setup(struct net_device *dev) 1736 { 1737 dev->netdev_ops = &ip6_tnl_netdev_ops; 1738 dev->destructor = ip6_dev_free; 1739 1740 dev->type = ARPHRD_TUNNEL6; 1741 dev->flags |= IFF_NOARP; 1742 dev->addr_len = sizeof(struct in6_addr); 1743 dev->features |= NETIF_F_LLTX; 1744 netif_keep_dst(dev); 1745 1746 dev->features |= IPXIPX_FEATURES; 1747 dev->hw_features |= IPXIPX_FEATURES; 1748 1749 /* This perm addr will be used as interface identifier by IPv6 */ 1750 dev->addr_assign_type = NET_ADDR_RANDOM; 1751 eth_random_addr(dev->perm_addr); 1752 } 1753 1754 1755 /** 1756 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices 1757 * @dev: virtual device associated with tunnel 1758 **/ 1759 1760 static inline int 1761 ip6_tnl_dev_init_gen(struct net_device *dev) 1762 { 1763 struct ip6_tnl *t = netdev_priv(dev); 1764 int ret; 1765 int t_hlen; 1766 1767 t->dev = dev; 1768 t->net = dev_net(dev); 1769 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1770 if (!dev->tstats) 1771 return -ENOMEM; 1772 1773 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); 1774 if (ret) 1775 goto free_stats; 1776 1777 ret = gro_cells_init(&t->gro_cells, dev); 1778 if (ret) 1779 goto destroy_dst; 1780 1781 t->tun_hlen = 0; 1782 t->hlen = t->encap_hlen + t->tun_hlen; 1783 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1784 1785 dev->type = ARPHRD_TUNNEL6; 1786 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1787 dev->mtu = ETH_DATA_LEN - t_hlen; 1788 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1789 dev->mtu -= 8; 1790 1791 return 0; 1792 1793 destroy_dst: 1794 dst_cache_destroy(&t->dst_cache); 1795 free_stats: 1796 free_percpu(dev->tstats); 1797 dev->tstats = NULL; 1798 1799 return ret; 1800 } 1801 1802 /** 1803 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices 1804 * @dev: virtual device associated with tunnel 1805 **/ 1806 1807 static int ip6_tnl_dev_init(struct net_device *dev) 1808 { 1809 struct ip6_tnl *t = netdev_priv(dev); 1810 int err = ip6_tnl_dev_init_gen(dev); 1811 1812 if (err) 1813 return err; 1814 ip6_tnl_link_config(t); 1815 if (t->parms.collect_md) { 1816 dev->features |= NETIF_F_NETNS_LOCAL; 1817 netif_keep_dst(dev); 1818 } 1819 return 0; 1820 } 1821 1822 /** 1823 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device 1824 * @dev: fallback device 1825 * 1826 * Return: 0 1827 **/ 1828 1829 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) 1830 { 1831 struct ip6_tnl *t = netdev_priv(dev); 1832 struct net *net = dev_net(dev); 1833 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1834 1835 t->parms.proto = IPPROTO_IPV6; 1836 dev_hold(dev); 1837 1838 rcu_assign_pointer(ip6n->tnls_wc[0], t); 1839 return 0; 1840 } 1841 1842 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[]) 1843 { 1844 u8 proto; 1845 1846 if (!data || !data[IFLA_IPTUN_PROTO]) 1847 return 0; 1848 1849 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1850 if (proto != IPPROTO_IPV6 && 1851 proto != IPPROTO_IPIP && 1852 proto != 0) 1853 return -EINVAL; 1854 1855 return 0; 1856 } 1857 1858 static void ip6_tnl_netlink_parms(struct nlattr *data[], 1859 struct __ip6_tnl_parm *parms) 1860 { 1861 memset(parms, 0, sizeof(*parms)); 1862 1863 if (!data) 1864 return; 1865 1866 if (data[IFLA_IPTUN_LINK]) 1867 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1868 1869 if (data[IFLA_IPTUN_LOCAL]) 1870 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); 1871 1872 if (data[IFLA_IPTUN_REMOTE]) 1873 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); 1874 1875 if (data[IFLA_IPTUN_TTL]) 1876 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); 1877 1878 if (data[IFLA_IPTUN_ENCAP_LIMIT]) 1879 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); 1880 1881 if (data[IFLA_IPTUN_FLOWINFO]) 1882 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); 1883 1884 if (data[IFLA_IPTUN_FLAGS]) 1885 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); 1886 1887 if (data[IFLA_IPTUN_PROTO]) 1888 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1889 1890 if (data[IFLA_IPTUN_COLLECT_METADATA]) 1891 parms->collect_md = true; 1892 } 1893 1894 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], 1895 struct ip_tunnel_encap *ipencap) 1896 { 1897 bool ret = false; 1898 1899 memset(ipencap, 0, sizeof(*ipencap)); 1900 1901 if (!data) 1902 return ret; 1903 1904 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1905 ret = true; 1906 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1907 } 1908 1909 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1910 ret = true; 1911 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1912 } 1913 1914 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1915 ret = true; 1916 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1917 } 1918 1919 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1920 ret = true; 1921 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1922 } 1923 1924 return ret; 1925 } 1926 1927 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, 1928 struct nlattr *tb[], struct nlattr *data[]) 1929 { 1930 struct net *net = dev_net(dev); 1931 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1932 struct ip6_tnl *nt, *t; 1933 struct ip_tunnel_encap ipencap; 1934 1935 nt = netdev_priv(dev); 1936 1937 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 1938 int err = ip6_tnl_encap_setup(nt, &ipencap); 1939 1940 if (err < 0) 1941 return err; 1942 } 1943 1944 ip6_tnl_netlink_parms(data, &nt->parms); 1945 1946 if (nt->parms.collect_md) { 1947 if (rtnl_dereference(ip6n->collect_md_tun)) 1948 return -EEXIST; 1949 } else { 1950 t = ip6_tnl_locate(net, &nt->parms, 0); 1951 if (!IS_ERR(t)) 1952 return -EEXIST; 1953 } 1954 1955 return ip6_tnl_create2(dev); 1956 } 1957 1958 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], 1959 struct nlattr *data[]) 1960 { 1961 struct ip6_tnl *t = netdev_priv(dev); 1962 struct __ip6_tnl_parm p; 1963 struct net *net = t->net; 1964 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1965 struct ip_tunnel_encap ipencap; 1966 1967 if (dev == ip6n->fb_tnl_dev) 1968 return -EINVAL; 1969 1970 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 1971 int err = ip6_tnl_encap_setup(t, &ipencap); 1972 1973 if (err < 0) 1974 return err; 1975 } 1976 ip6_tnl_netlink_parms(data, &p); 1977 if (p.collect_md) 1978 return -EINVAL; 1979 1980 t = ip6_tnl_locate(net, &p, 0); 1981 if (!IS_ERR(t)) { 1982 if (t->dev != dev) 1983 return -EEXIST; 1984 } else 1985 t = netdev_priv(dev); 1986 1987 return ip6_tnl_update(t, &p); 1988 } 1989 1990 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) 1991 { 1992 struct net *net = dev_net(dev); 1993 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1994 1995 if (dev != ip6n->fb_tnl_dev) 1996 unregister_netdevice_queue(dev, head); 1997 } 1998 1999 static size_t ip6_tnl_get_size(const struct net_device *dev) 2000 { 2001 return 2002 /* IFLA_IPTUN_LINK */ 2003 nla_total_size(4) + 2004 /* IFLA_IPTUN_LOCAL */ 2005 nla_total_size(sizeof(struct in6_addr)) + 2006 /* IFLA_IPTUN_REMOTE */ 2007 nla_total_size(sizeof(struct in6_addr)) + 2008 /* IFLA_IPTUN_TTL */ 2009 nla_total_size(1) + 2010 /* IFLA_IPTUN_ENCAP_LIMIT */ 2011 nla_total_size(1) + 2012 /* IFLA_IPTUN_FLOWINFO */ 2013 nla_total_size(4) + 2014 /* IFLA_IPTUN_FLAGS */ 2015 nla_total_size(4) + 2016 /* IFLA_IPTUN_PROTO */ 2017 nla_total_size(1) + 2018 /* IFLA_IPTUN_ENCAP_TYPE */ 2019 nla_total_size(2) + 2020 /* IFLA_IPTUN_ENCAP_FLAGS */ 2021 nla_total_size(2) + 2022 /* IFLA_IPTUN_ENCAP_SPORT */ 2023 nla_total_size(2) + 2024 /* IFLA_IPTUN_ENCAP_DPORT */ 2025 nla_total_size(2) + 2026 /* IFLA_IPTUN_COLLECT_METADATA */ 2027 nla_total_size(0) + 2028 0; 2029 } 2030 2031 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) 2032 { 2033 struct ip6_tnl *tunnel = netdev_priv(dev); 2034 struct __ip6_tnl_parm *parm = &tunnel->parms; 2035 2036 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 2037 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || 2038 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || 2039 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || 2040 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || 2041 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || 2042 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || 2043 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto)) 2044 goto nla_put_failure; 2045 2046 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || 2047 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) || 2048 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || 2049 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) 2050 goto nla_put_failure; 2051 2052 if (parm->collect_md) 2053 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) 2054 goto nla_put_failure; 2055 return 0; 2056 2057 nla_put_failure: 2058 return -EMSGSIZE; 2059 } 2060 2061 struct net *ip6_tnl_get_link_net(const struct net_device *dev) 2062 { 2063 struct ip6_tnl *tunnel = netdev_priv(dev); 2064 2065 return tunnel->net; 2066 } 2067 EXPORT_SYMBOL(ip6_tnl_get_link_net); 2068 2069 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { 2070 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 2071 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, 2072 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, 2073 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 2074 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, 2075 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, 2076 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, 2077 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 2078 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 2079 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 2080 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 2081 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 2082 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, 2083 }; 2084 2085 static struct rtnl_link_ops ip6_link_ops __read_mostly = { 2086 .kind = "ip6tnl", 2087 .maxtype = IFLA_IPTUN_MAX, 2088 .policy = ip6_tnl_policy, 2089 .priv_size = sizeof(struct ip6_tnl), 2090 .setup = ip6_tnl_dev_setup, 2091 .validate = ip6_tnl_validate, 2092 .newlink = ip6_tnl_newlink, 2093 .changelink = ip6_tnl_changelink, 2094 .dellink = ip6_tnl_dellink, 2095 .get_size = ip6_tnl_get_size, 2096 .fill_info = ip6_tnl_fill_info, 2097 .get_link_net = ip6_tnl_get_link_net, 2098 }; 2099 2100 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { 2101 .handler = ip4ip6_rcv, 2102 .err_handler = ip4ip6_err, 2103 .priority = 1, 2104 }; 2105 2106 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { 2107 .handler = ip6ip6_rcv, 2108 .err_handler = ip6ip6_err, 2109 .priority = 1, 2110 }; 2111 2112 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net) 2113 { 2114 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2115 struct net_device *dev, *aux; 2116 int h; 2117 struct ip6_tnl *t; 2118 LIST_HEAD(list); 2119 2120 for_each_netdev_safe(net, dev, aux) 2121 if (dev->rtnl_link_ops == &ip6_link_ops) 2122 unregister_netdevice_queue(dev, &list); 2123 2124 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) { 2125 t = rtnl_dereference(ip6n->tnls_r_l[h]); 2126 while (t) { 2127 /* If dev is in the same netns, it has already 2128 * been added to the list by the previous loop. 2129 */ 2130 if (!net_eq(dev_net(t->dev), net)) 2131 unregister_netdevice_queue(t->dev, &list); 2132 t = rtnl_dereference(t->next); 2133 } 2134 } 2135 2136 unregister_netdevice_many(&list); 2137 } 2138 2139 static int __net_init ip6_tnl_init_net(struct net *net) 2140 { 2141 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2142 struct ip6_tnl *t = NULL; 2143 int err; 2144 2145 ip6n->tnls[0] = ip6n->tnls_wc; 2146 ip6n->tnls[1] = ip6n->tnls_r_l; 2147 2148 err = -ENOMEM; 2149 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", 2150 NET_NAME_UNKNOWN, ip6_tnl_dev_setup); 2151 2152 if (!ip6n->fb_tnl_dev) 2153 goto err_alloc_dev; 2154 dev_net_set(ip6n->fb_tnl_dev, net); 2155 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; 2156 /* FB netdevice is special: we have one, and only one per netns. 2157 * Allowing to move it to another netns is clearly unsafe. 2158 */ 2159 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; 2160 2161 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); 2162 if (err < 0) 2163 goto err_register; 2164 2165 err = register_netdev(ip6n->fb_tnl_dev); 2166 if (err < 0) 2167 goto err_register; 2168 2169 t = netdev_priv(ip6n->fb_tnl_dev); 2170 2171 strcpy(t->parms.name, ip6n->fb_tnl_dev->name); 2172 return 0; 2173 2174 err_register: 2175 ip6_dev_free(ip6n->fb_tnl_dev); 2176 err_alloc_dev: 2177 return err; 2178 } 2179 2180 static void __net_exit ip6_tnl_exit_net(struct net *net) 2181 { 2182 rtnl_lock(); 2183 ip6_tnl_destroy_tunnels(net); 2184 rtnl_unlock(); 2185 } 2186 2187 static struct pernet_operations ip6_tnl_net_ops = { 2188 .init = ip6_tnl_init_net, 2189 .exit = ip6_tnl_exit_net, 2190 .id = &ip6_tnl_net_id, 2191 .size = sizeof(struct ip6_tnl_net), 2192 }; 2193 2194 /** 2195 * ip6_tunnel_init - register protocol and reserve needed resources 2196 * 2197 * Return: 0 on success 2198 **/ 2199 2200 static int __init ip6_tunnel_init(void) 2201 { 2202 int err; 2203 2204 err = register_pernet_device(&ip6_tnl_net_ops); 2205 if (err < 0) 2206 goto out_pernet; 2207 2208 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); 2209 if (err < 0) { 2210 pr_err("%s: can't register ip4ip6\n", __func__); 2211 goto out_ip4ip6; 2212 } 2213 2214 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); 2215 if (err < 0) { 2216 pr_err("%s: can't register ip6ip6\n", __func__); 2217 goto out_ip6ip6; 2218 } 2219 err = rtnl_link_register(&ip6_link_ops); 2220 if (err < 0) 2221 goto rtnl_link_failed; 2222 2223 return 0; 2224 2225 rtnl_link_failed: 2226 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); 2227 out_ip6ip6: 2228 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); 2229 out_ip4ip6: 2230 unregister_pernet_device(&ip6_tnl_net_ops); 2231 out_pernet: 2232 return err; 2233 } 2234 2235 /** 2236 * ip6_tunnel_cleanup - free resources and unregister protocol 2237 **/ 2238 2239 static void __exit ip6_tunnel_cleanup(void) 2240 { 2241 rtnl_link_unregister(&ip6_link_ops); 2242 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) 2243 pr_info("%s: can't deregister ip4ip6\n", __func__); 2244 2245 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) 2246 pr_info("%s: can't deregister ip6ip6\n", __func__); 2247 2248 unregister_pernet_device(&ip6_tnl_net_ops); 2249 } 2250 2251 module_init(ip6_tunnel_init); 2252 module_exit(ip6_tunnel_cleanup); 2253