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 net *net = dev_net(skb->dev); 476 u8 rel_type = ICMPV6_DEST_UNREACH; 477 u8 rel_code = ICMPV6_ADDR_UNREACH; 478 __u32 rel_info = 0; 479 struct ip6_tnl *t; 480 int err = -ENOENT; 481 int rel_msg = 0; 482 u8 tproto; 483 __u16 len; 484 485 /* If the packet doesn't contain the original IPv6 header we are 486 in trouble since we might need the source address for further 487 processing of the error. */ 488 489 rcu_read_lock(); 490 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); 491 if (!t) 492 goto out; 493 494 tproto = READ_ONCE(t->parms.proto); 495 if (tproto != ipproto && tproto != 0) 496 goto out; 497 498 err = 0; 499 500 switch (*type) { 501 struct ipv6_tlv_tnl_enc_lim *tel; 502 __u32 mtu, teli; 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 ip6_update_pmtu(skb, net, htonl(*info), 0, 0, 534 sock_net_uid(net, NULL)); 535 mtu = *info - offset; 536 if (mtu < IPV6_MIN_MTU) 537 mtu = IPV6_MIN_MTU; 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 case NDISC_REDIRECT: 547 ip6_redirect(skb, net, skb->dev->ifindex, 0, 548 sock_net_uid(net, NULL)); 549 break; 550 } 551 552 *type = rel_type; 553 *code = rel_code; 554 *info = rel_info; 555 *msg = rel_msg; 556 557 out: 558 rcu_read_unlock(); 559 return err; 560 } 561 562 static int 563 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 564 u8 type, u8 code, int offset, __be32 info) 565 { 566 __u32 rel_info = ntohl(info); 567 const struct iphdr *eiph; 568 struct sk_buff *skb2; 569 int err, rel_msg = 0; 570 u8 rel_type = type; 571 u8 rel_code = code; 572 struct rtable *rt; 573 struct flowi4 fl4; 574 575 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, 576 &rel_msg, &rel_info, offset); 577 if (err < 0) 578 return err; 579 580 if (rel_msg == 0) 581 return 0; 582 583 switch (rel_type) { 584 case ICMPV6_DEST_UNREACH: 585 if (rel_code != ICMPV6_ADDR_UNREACH) 586 return 0; 587 rel_type = ICMP_DEST_UNREACH; 588 rel_code = ICMP_HOST_UNREACH; 589 break; 590 case ICMPV6_PKT_TOOBIG: 591 if (rel_code != 0) 592 return 0; 593 rel_type = ICMP_DEST_UNREACH; 594 rel_code = ICMP_FRAG_NEEDED; 595 break; 596 default: 597 return 0; 598 } 599 600 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) 601 return 0; 602 603 skb2 = skb_clone(skb, GFP_ATOMIC); 604 if (!skb2) 605 return 0; 606 607 skb_dst_drop(skb2); 608 609 skb_pull(skb2, offset); 610 skb_reset_network_header(skb2); 611 eiph = ip_hdr(skb2); 612 613 /* Try to guess incoming interface */ 614 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr, 615 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 616 if (IS_ERR(rt)) 617 goto out; 618 619 skb2->dev = rt->dst.dev; 620 ip_rt_put(rt); 621 622 /* route "incoming" packet */ 623 if (rt->rt_flags & RTCF_LOCAL) { 624 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, 625 eiph->daddr, eiph->saddr, 0, 0, 626 IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 627 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL) { 628 if (!IS_ERR(rt)) 629 ip_rt_put(rt); 630 goto out; 631 } 632 skb_dst_set(skb2, &rt->dst); 633 } else { 634 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, 635 skb2->dev) || 636 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) 637 goto out; 638 } 639 640 /* change mtu on this route */ 641 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { 642 if (rel_info > dst_mtu(skb_dst(skb2))) 643 goto out; 644 645 skb_dst_update_pmtu(skb2, rel_info); 646 } 647 648 icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); 649 650 out: 651 kfree_skb(skb2); 652 return 0; 653 } 654 655 static int 656 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 657 u8 type, u8 code, int offset, __be32 info) 658 { 659 __u32 rel_info = ntohl(info); 660 int err, rel_msg = 0; 661 u8 rel_type = type; 662 u8 rel_code = code; 663 664 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, 665 &rel_msg, &rel_info, offset); 666 if (err < 0) 667 return err; 668 669 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { 670 struct rt6_info *rt; 671 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 672 673 if (!skb2) 674 return 0; 675 676 skb_dst_drop(skb2); 677 skb_pull(skb2, offset); 678 skb_reset_network_header(skb2); 679 680 /* Try to guess incoming interface */ 681 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, 682 NULL, 0, 0); 683 684 if (rt && rt->dst.dev) 685 skb2->dev = rt->dst.dev; 686 687 icmpv6_send(skb2, rel_type, rel_code, rel_info); 688 689 ip6_rt_put(rt); 690 691 kfree_skb(skb2); 692 } 693 694 return 0; 695 } 696 697 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 698 const struct ipv6hdr *ipv6h, 699 struct sk_buff *skb) 700 { 701 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; 702 703 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 704 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); 705 706 return IP6_ECN_decapsulate(ipv6h, skb); 707 } 708 709 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 710 const struct ipv6hdr *ipv6h, 711 struct sk_buff *skb) 712 { 713 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 714 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); 715 716 return IP6_ECN_decapsulate(ipv6h, skb); 717 } 718 719 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, 720 const struct in6_addr *laddr, 721 const struct in6_addr *raddr) 722 { 723 struct __ip6_tnl_parm *p = &t->parms; 724 int ltype = ipv6_addr_type(laddr); 725 int rtype = ipv6_addr_type(raddr); 726 __u32 flags = 0; 727 728 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { 729 flags = IP6_TNL_F_CAP_PER_PACKET; 730 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 731 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 732 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && 733 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { 734 if (ltype&IPV6_ADDR_UNICAST) 735 flags |= IP6_TNL_F_CAP_XMIT; 736 if (rtype&IPV6_ADDR_UNICAST) 737 flags |= IP6_TNL_F_CAP_RCV; 738 } 739 return flags; 740 } 741 EXPORT_SYMBOL(ip6_tnl_get_cap); 742 743 /* called with rcu_read_lock() */ 744 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, 745 const struct in6_addr *laddr, 746 const struct in6_addr *raddr) 747 { 748 struct __ip6_tnl_parm *p = &t->parms; 749 int ret = 0; 750 struct net *net = t->net; 751 752 if ((p->flags & IP6_TNL_F_CAP_RCV) || 753 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 754 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { 755 struct net_device *ldev = NULL; 756 757 if (p->link) 758 ldev = dev_get_by_index_rcu(net, p->link); 759 760 if ((ipv6_addr_is_multicast(laddr) || 761 likely(ipv6_chk_addr(net, laddr, ldev, 0))) && 762 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) || 763 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))) 764 ret = 1; 765 } 766 return ret; 767 } 768 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); 769 770 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 771 const struct tnl_ptk_info *tpi, 772 struct metadata_dst *tun_dst, 773 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 774 const struct ipv6hdr *ipv6h, 775 struct sk_buff *skb), 776 bool log_ecn_err) 777 { 778 struct pcpu_sw_netstats *tstats; 779 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 780 int err; 781 782 if ((!(tpi->flags & TUNNEL_CSUM) && 783 (tunnel->parms.i_flags & TUNNEL_CSUM)) || 784 ((tpi->flags & TUNNEL_CSUM) && 785 !(tunnel->parms.i_flags & TUNNEL_CSUM))) { 786 tunnel->dev->stats.rx_crc_errors++; 787 tunnel->dev->stats.rx_errors++; 788 goto drop; 789 } 790 791 if (tunnel->parms.i_flags & TUNNEL_SEQ) { 792 if (!(tpi->flags & TUNNEL_SEQ) || 793 (tunnel->i_seqno && 794 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { 795 tunnel->dev->stats.rx_fifo_errors++; 796 tunnel->dev->stats.rx_errors++; 797 goto drop; 798 } 799 tunnel->i_seqno = ntohl(tpi->seq) + 1; 800 } 801 802 skb->protocol = tpi->proto; 803 804 /* Warning: All skb pointers will be invalidated! */ 805 if (tunnel->dev->type == ARPHRD_ETHER) { 806 if (!pskb_may_pull(skb, ETH_HLEN)) { 807 tunnel->dev->stats.rx_length_errors++; 808 tunnel->dev->stats.rx_errors++; 809 goto drop; 810 } 811 812 ipv6h = ipv6_hdr(skb); 813 skb->protocol = eth_type_trans(skb, tunnel->dev); 814 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 815 } else { 816 skb->dev = tunnel->dev; 817 } 818 819 skb_reset_network_header(skb); 820 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 821 822 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); 823 824 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); 825 if (unlikely(err)) { 826 if (log_ecn_err) 827 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", 828 &ipv6h->saddr, 829 ipv6_get_dsfield(ipv6h)); 830 if (err > 1) { 831 ++tunnel->dev->stats.rx_frame_errors; 832 ++tunnel->dev->stats.rx_errors; 833 goto drop; 834 } 835 } 836 837 tstats = this_cpu_ptr(tunnel->dev->tstats); 838 u64_stats_update_begin(&tstats->syncp); 839 tstats->rx_packets++; 840 tstats->rx_bytes += skb->len; 841 u64_stats_update_end(&tstats->syncp); 842 843 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); 844 845 if (tun_dst) 846 skb_dst_set(skb, (struct dst_entry *)tun_dst); 847 848 gro_cells_receive(&tunnel->gro_cells, skb); 849 return 0; 850 851 drop: 852 if (tun_dst) 853 dst_release((struct dst_entry *)tun_dst); 854 kfree_skb(skb); 855 return 0; 856 } 857 858 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, 859 const struct tnl_ptk_info *tpi, 860 struct metadata_dst *tun_dst, 861 bool log_ecn_err) 862 { 863 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, ip6ip6_dscp_ecn_decapsulate, 864 log_ecn_err); 865 } 866 EXPORT_SYMBOL(ip6_tnl_rcv); 867 868 static const struct tnl_ptk_info tpi_v6 = { 869 /* no tunnel info required for ipxip6. */ 870 .proto = htons(ETH_P_IPV6), 871 }; 872 873 static const struct tnl_ptk_info tpi_v4 = { 874 /* no tunnel info required for ipxip6. */ 875 .proto = htons(ETH_P_IP), 876 }; 877 878 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, 879 const struct tnl_ptk_info *tpi, 880 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 881 const struct ipv6hdr *ipv6h, 882 struct sk_buff *skb)) 883 { 884 struct ip6_tnl *t; 885 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 886 struct metadata_dst *tun_dst = NULL; 887 int ret = -1; 888 889 rcu_read_lock(); 890 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); 891 892 if (t) { 893 u8 tproto = READ_ONCE(t->parms.proto); 894 895 if (tproto != ipproto && tproto != 0) 896 goto drop; 897 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 898 goto drop; 899 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) 900 goto drop; 901 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 902 goto drop; 903 if (t->parms.collect_md) { 904 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0); 905 if (!tun_dst) 906 goto drop; 907 } 908 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, 909 log_ecn_error); 910 } 911 912 rcu_read_unlock(); 913 914 return ret; 915 916 drop: 917 rcu_read_unlock(); 918 kfree_skb(skb); 919 return 0; 920 } 921 922 static int ip4ip6_rcv(struct sk_buff *skb) 923 { 924 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4, 925 ip4ip6_dscp_ecn_decapsulate); 926 } 927 928 static int ip6ip6_rcv(struct sk_buff *skb) 929 { 930 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, 931 ip6ip6_dscp_ecn_decapsulate); 932 } 933 934 struct ipv6_tel_txoption { 935 struct ipv6_txoptions ops; 936 __u8 dst_opt[8]; 937 }; 938 939 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) 940 { 941 memset(opt, 0, sizeof(struct ipv6_tel_txoption)); 942 943 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; 944 opt->dst_opt[3] = 1; 945 opt->dst_opt[4] = encap_limit; 946 opt->dst_opt[5] = IPV6_TLV_PADN; 947 opt->dst_opt[6] = 1; 948 949 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt; 950 opt->ops.opt_nflen = 8; 951 } 952 953 /** 954 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 955 * @t: the outgoing tunnel device 956 * @hdr: IPv6 header from the incoming packet 957 * 958 * Description: 959 * Avoid trivial tunneling loop by checking that tunnel exit-point 960 * doesn't match source of incoming packet. 961 * 962 * Return: 963 * 1 if conflict, 964 * 0 else 965 **/ 966 967 static inline bool 968 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) 969 { 970 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 971 } 972 973 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, 974 const struct in6_addr *laddr, 975 const struct in6_addr *raddr) 976 { 977 struct __ip6_tnl_parm *p = &t->parms; 978 int ret = 0; 979 struct net *net = t->net; 980 981 if (t->parms.collect_md) 982 return 1; 983 984 if ((p->flags & IP6_TNL_F_CAP_XMIT) || 985 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 986 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { 987 struct net_device *ldev = NULL; 988 989 rcu_read_lock(); 990 if (p->link) 991 ldev = dev_get_by_index_rcu(net, p->link); 992 993 if (unlikely(!ipv6_chk_addr(net, laddr, ldev, 0))) 994 pr_warn("%s xmit: Local address not yet configured!\n", 995 p->name); 996 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) && 997 !ipv6_addr_is_multicast(raddr) && 998 unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) 999 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", 1000 p->name); 1001 else 1002 ret = 1; 1003 rcu_read_unlock(); 1004 } 1005 return ret; 1006 } 1007 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); 1008 1009 /** 1010 * ip6_tnl_xmit - encapsulate packet and send 1011 * @skb: the outgoing socket buffer 1012 * @dev: the outgoing tunnel device 1013 * @dsfield: dscp code for outer header 1014 * @fl6: flow of tunneled packet 1015 * @encap_limit: encapsulation limit 1016 * @pmtu: Path MTU is stored if packet is too big 1017 * @proto: next header value 1018 * 1019 * Description: 1020 * Build new header and do some sanity checks on the packet before sending 1021 * it. 1022 * 1023 * Return: 1024 * 0 on success 1025 * -1 fail 1026 * %-EMSGSIZE message too big. return mtu in this case. 1027 **/ 1028 1029 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 1030 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, 1031 __u8 proto) 1032 { 1033 struct ip6_tnl *t = netdev_priv(dev); 1034 struct net *net = t->net; 1035 struct net_device_stats *stats = &t->dev->stats; 1036 struct ipv6hdr *ipv6h; 1037 struct ipv6_tel_txoption opt; 1038 struct dst_entry *dst = NULL, *ndst = NULL; 1039 struct net_device *tdev; 1040 int mtu; 1041 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0; 1042 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; 1043 unsigned int max_headroom = psh_hlen; 1044 bool use_cache = false; 1045 u8 hop_limit; 1046 int err = -1; 1047 1048 if (t->parms.collect_md) { 1049 hop_limit = skb_tunnel_info(skb)->key.ttl; 1050 goto route_lookup; 1051 } else { 1052 hop_limit = t->parms.hop_limit; 1053 } 1054 1055 /* NBMA tunnel */ 1056 if (ipv6_addr_any(&t->parms.raddr)) { 1057 if (skb->protocol == htons(ETH_P_IPV6)) { 1058 struct in6_addr *addr6; 1059 struct neighbour *neigh; 1060 int addr_type; 1061 1062 if (!skb_dst(skb)) 1063 goto tx_err_link_failure; 1064 1065 neigh = dst_neigh_lookup(skb_dst(skb), 1066 &ipv6_hdr(skb)->daddr); 1067 if (!neigh) 1068 goto tx_err_link_failure; 1069 1070 addr6 = (struct in6_addr *)&neigh->primary_key; 1071 addr_type = ipv6_addr_type(addr6); 1072 1073 if (addr_type == IPV6_ADDR_ANY) 1074 addr6 = &ipv6_hdr(skb)->daddr; 1075 1076 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); 1077 neigh_release(neigh); 1078 } 1079 } else if (t->parms.proto != 0 && !(t->parms.flags & 1080 (IP6_TNL_F_USE_ORIG_TCLASS | 1081 IP6_TNL_F_USE_ORIG_FWMARK))) { 1082 /* enable the cache only if neither the outer protocol nor the 1083 * routing decision depends on the current inner header value 1084 */ 1085 use_cache = true; 1086 } 1087 1088 if (use_cache) 1089 dst = dst_cache_get(&t->dst_cache); 1090 1091 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) 1092 goto tx_err_link_failure; 1093 1094 if (!dst) { 1095 route_lookup: 1096 /* add dsfield to flowlabel for route lookup */ 1097 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel); 1098 1099 dst = ip6_route_output(net, NULL, fl6); 1100 1101 if (dst->error) 1102 goto tx_err_link_failure; 1103 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); 1104 if (IS_ERR(dst)) { 1105 err = PTR_ERR(dst); 1106 dst = NULL; 1107 goto tx_err_link_failure; 1108 } 1109 if (t->parms.collect_md && 1110 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, 1111 &fl6->daddr, 0, &fl6->saddr)) 1112 goto tx_err_link_failure; 1113 ndst = dst; 1114 } 1115 1116 tdev = dst->dev; 1117 1118 if (tdev == dev) { 1119 stats->collisions++; 1120 net_warn_ratelimited("%s: Local routing loop detected!\n", 1121 t->parms.name); 1122 goto tx_err_dst_release; 1123 } 1124 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen; 1125 if (encap_limit >= 0) { 1126 max_headroom += 8; 1127 mtu -= 8; 1128 } 1129 if (skb->protocol == htons(ETH_P_IPV6)) { 1130 if (mtu < IPV6_MIN_MTU) 1131 mtu = IPV6_MIN_MTU; 1132 } else if (mtu < 576) { 1133 mtu = 576; 1134 } 1135 1136 skb_dst_update_pmtu(skb, mtu); 1137 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) { 1138 *pmtu = mtu; 1139 err = -EMSGSIZE; 1140 goto tx_err_dst_release; 1141 } 1142 1143 if (t->err_count > 0) { 1144 if (time_before(jiffies, 1145 t->err_time + IP6TUNNEL_ERR_TIMEO)) { 1146 t->err_count--; 1147 1148 dst_link_failure(skb); 1149 } else { 1150 t->err_count = 0; 1151 } 1152 } 1153 1154 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); 1155 1156 /* 1157 * Okay, now see if we can stuff it in the buffer as-is. 1158 */ 1159 max_headroom += LL_RESERVED_SPACE(tdev); 1160 1161 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1162 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1163 struct sk_buff *new_skb; 1164 1165 new_skb = skb_realloc_headroom(skb, max_headroom); 1166 if (!new_skb) 1167 goto tx_err_dst_release; 1168 1169 if (skb->sk) 1170 skb_set_owner_w(new_skb, skb->sk); 1171 consume_skb(skb); 1172 skb = new_skb; 1173 } 1174 1175 if (t->parms.collect_md) { 1176 if (t->encap.type != TUNNEL_ENCAP_NONE) 1177 goto tx_err_dst_release; 1178 } else { 1179 if (use_cache && ndst) 1180 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); 1181 } 1182 skb_dst_set(skb, dst); 1183 1184 if (encap_limit >= 0) { 1185 init_tel_txopt(&opt, encap_limit); 1186 ipv6_push_frag_opts(skb, &opt.ops, &proto); 1187 } 1188 hop_limit = hop_limit ? : ip6_dst_hoplimit(dst); 1189 1190 /* Calculate max headroom for all the headers and adjust 1191 * needed_headroom if necessary. 1192 */ 1193 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) 1194 + dst->header_len + t->hlen; 1195 if (max_headroom > dev->needed_headroom) 1196 dev->needed_headroom = max_headroom; 1197 1198 err = ip6_tnl_encap(skb, t, &proto, fl6); 1199 if (err) 1200 return err; 1201 1202 skb_push(skb, sizeof(struct ipv6hdr)); 1203 skb_reset_network_header(skb); 1204 ipv6h = ipv6_hdr(skb); 1205 ip6_flow_hdr(ipv6h, dsfield, 1206 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); 1207 ipv6h->hop_limit = hop_limit; 1208 ipv6h->nexthdr = proto; 1209 ipv6h->saddr = fl6->saddr; 1210 ipv6h->daddr = fl6->daddr; 1211 ip6tunnel_xmit(NULL, skb, dev); 1212 return 0; 1213 tx_err_link_failure: 1214 stats->tx_carrier_errors++; 1215 dst_link_failure(skb); 1216 tx_err_dst_release: 1217 dst_release(dst); 1218 return err; 1219 } 1220 EXPORT_SYMBOL(ip6_tnl_xmit); 1221 1222 static inline int 1223 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1224 { 1225 struct ip6_tnl *t = netdev_priv(dev); 1226 const struct iphdr *iph = ip_hdr(skb); 1227 int encap_limit = -1; 1228 struct flowi6 fl6; 1229 __u8 dsfield; 1230 __u32 mtu; 1231 u8 tproto; 1232 int err; 1233 1234 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1235 1236 tproto = READ_ONCE(t->parms.proto); 1237 if (tproto != IPPROTO_IPIP && tproto != 0) 1238 return -1; 1239 1240 if (t->parms.collect_md) { 1241 struct ip_tunnel_info *tun_info; 1242 const struct ip_tunnel_key *key; 1243 1244 tun_info = skb_tunnel_info(skb); 1245 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1246 ip_tunnel_info_af(tun_info) != AF_INET6)) 1247 return -1; 1248 key = &tun_info->key; 1249 memset(&fl6, 0, sizeof(fl6)); 1250 fl6.flowi6_proto = IPPROTO_IPIP; 1251 fl6.daddr = key->u.ipv6.dst; 1252 fl6.flowlabel = key->label; 1253 dsfield = key->tos; 1254 } else { 1255 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1256 encap_limit = t->parms.encap_limit; 1257 1258 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1259 fl6.flowi6_proto = IPPROTO_IPIP; 1260 1261 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1262 dsfield = ipv4_get_dsfield(iph); 1263 else 1264 dsfield = ip6_tclass(t->parms.flowinfo); 1265 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1266 fl6.flowi6_mark = skb->mark; 1267 else 1268 fl6.flowi6_mark = t->parms.fwmark; 1269 } 1270 1271 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1272 1273 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1274 return -1; 1275 1276 dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph)); 1277 1278 skb_set_inner_ipproto(skb, IPPROTO_IPIP); 1279 1280 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1281 IPPROTO_IPIP); 1282 if (err != 0) { 1283 /* XXX: send ICMP error even if DF is not set. */ 1284 if (err == -EMSGSIZE) 1285 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 1286 htonl(mtu)); 1287 return -1; 1288 } 1289 1290 return 0; 1291 } 1292 1293 static inline int 1294 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1295 { 1296 struct ip6_tnl *t = netdev_priv(dev); 1297 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 1298 int encap_limit = -1; 1299 __u16 offset; 1300 struct flowi6 fl6; 1301 __u8 dsfield; 1302 __u32 mtu; 1303 u8 tproto; 1304 int err; 1305 1306 tproto = READ_ONCE(t->parms.proto); 1307 if ((tproto != IPPROTO_IPV6 && tproto != 0) || 1308 ip6_tnl_addr_conflict(t, ipv6h)) 1309 return -1; 1310 1311 if (t->parms.collect_md) { 1312 struct ip_tunnel_info *tun_info; 1313 const struct ip_tunnel_key *key; 1314 1315 tun_info = skb_tunnel_info(skb); 1316 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1317 ip_tunnel_info_af(tun_info) != AF_INET6)) 1318 return -1; 1319 key = &tun_info->key; 1320 memset(&fl6, 0, sizeof(fl6)); 1321 fl6.flowi6_proto = IPPROTO_IPV6; 1322 fl6.daddr = key->u.ipv6.dst; 1323 fl6.flowlabel = key->label; 1324 dsfield = key->tos; 1325 } else { 1326 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 1327 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 1328 ipv6h = ipv6_hdr(skb); 1329 if (offset > 0) { 1330 struct ipv6_tlv_tnl_enc_lim *tel; 1331 1332 tel = (void *)&skb_network_header(skb)[offset]; 1333 if (tel->encap_limit == 0) { 1334 icmpv6_send(skb, ICMPV6_PARAMPROB, 1335 ICMPV6_HDR_FIELD, offset + 2); 1336 return -1; 1337 } 1338 encap_limit = tel->encap_limit - 1; 1339 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 1340 encap_limit = t->parms.encap_limit; 1341 } 1342 1343 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1344 fl6.flowi6_proto = IPPROTO_IPV6; 1345 1346 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1347 dsfield = ipv6_get_dsfield(ipv6h); 1348 else 1349 dsfield = ip6_tclass(t->parms.flowinfo); 1350 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 1351 fl6.flowlabel |= ip6_flowlabel(ipv6h); 1352 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1353 fl6.flowi6_mark = skb->mark; 1354 else 1355 fl6.flowi6_mark = t->parms.fwmark; 1356 } 1357 1358 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1359 1360 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1361 return -1; 1362 1363 dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h)); 1364 1365 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1366 1367 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1368 IPPROTO_IPV6); 1369 if (err != 0) { 1370 if (err == -EMSGSIZE) 1371 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1372 return -1; 1373 } 1374 1375 return 0; 1376 } 1377 1378 static netdev_tx_t 1379 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) 1380 { 1381 struct ip6_tnl *t = netdev_priv(dev); 1382 struct net_device_stats *stats = &t->dev->stats; 1383 int ret; 1384 1385 switch (skb->protocol) { 1386 case htons(ETH_P_IP): 1387 ret = ip4ip6_tnl_xmit(skb, dev); 1388 break; 1389 case htons(ETH_P_IPV6): 1390 ret = ip6ip6_tnl_xmit(skb, dev); 1391 break; 1392 default: 1393 goto tx_err; 1394 } 1395 1396 if (ret < 0) 1397 goto tx_err; 1398 1399 return NETDEV_TX_OK; 1400 1401 tx_err: 1402 stats->tx_errors++; 1403 stats->tx_dropped++; 1404 kfree_skb(skb); 1405 return NETDEV_TX_OK; 1406 } 1407 1408 static void ip6_tnl_link_config(struct ip6_tnl *t) 1409 { 1410 struct net_device *dev = t->dev; 1411 struct __ip6_tnl_parm *p = &t->parms; 1412 struct flowi6 *fl6 = &t->fl.u.ip6; 1413 int t_hlen; 1414 1415 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1416 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1417 1418 /* Set up flowi template */ 1419 fl6->saddr = p->laddr; 1420 fl6->daddr = p->raddr; 1421 fl6->flowi6_oif = p->link; 1422 fl6->flowlabel = 0; 1423 1424 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1425 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1426 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1427 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1428 1429 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1430 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1431 1432 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) 1433 dev->flags |= IFF_POINTOPOINT; 1434 else 1435 dev->flags &= ~IFF_POINTOPOINT; 1436 1437 t->tun_hlen = 0; 1438 t->hlen = t->encap_hlen + t->tun_hlen; 1439 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1440 1441 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1442 int strict = (ipv6_addr_type(&p->raddr) & 1443 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1444 1445 struct rt6_info *rt = rt6_lookup(t->net, 1446 &p->raddr, &p->laddr, 1447 p->link, strict); 1448 1449 if (!rt) 1450 return; 1451 1452 if (rt->dst.dev) { 1453 dev->hard_header_len = rt->dst.dev->hard_header_len + 1454 t_hlen; 1455 1456 dev->mtu = rt->dst.dev->mtu - t_hlen; 1457 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1458 dev->mtu -= 8; 1459 1460 if (dev->mtu < IPV6_MIN_MTU) 1461 dev->mtu = IPV6_MIN_MTU; 1462 } 1463 ip6_rt_put(rt); 1464 } 1465 } 1466 1467 /** 1468 * ip6_tnl_change - update the tunnel parameters 1469 * @t: tunnel to be changed 1470 * @p: tunnel configuration parameters 1471 * 1472 * Description: 1473 * ip6_tnl_change() updates the tunnel parameters 1474 **/ 1475 1476 static int 1477 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) 1478 { 1479 t->parms.laddr = p->laddr; 1480 t->parms.raddr = p->raddr; 1481 t->parms.flags = p->flags; 1482 t->parms.hop_limit = p->hop_limit; 1483 t->parms.encap_limit = p->encap_limit; 1484 t->parms.flowinfo = p->flowinfo; 1485 t->parms.link = p->link; 1486 t->parms.proto = p->proto; 1487 t->parms.fwmark = p->fwmark; 1488 dst_cache_reset(&t->dst_cache); 1489 ip6_tnl_link_config(t); 1490 return 0; 1491 } 1492 1493 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1494 { 1495 struct net *net = t->net; 1496 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1497 int err; 1498 1499 ip6_tnl_unlink(ip6n, t); 1500 synchronize_net(); 1501 err = ip6_tnl_change(t, p); 1502 ip6_tnl_link(ip6n, t); 1503 netdev_state_change(t->dev); 1504 return err; 1505 } 1506 1507 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1508 { 1509 /* for default tnl0 device allow to change only the proto */ 1510 t->parms.proto = p->proto; 1511 netdev_state_change(t->dev); 1512 return 0; 1513 } 1514 1515 static void 1516 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) 1517 { 1518 p->laddr = u->laddr; 1519 p->raddr = u->raddr; 1520 p->flags = u->flags; 1521 p->hop_limit = u->hop_limit; 1522 p->encap_limit = u->encap_limit; 1523 p->flowinfo = u->flowinfo; 1524 p->link = u->link; 1525 p->proto = u->proto; 1526 memcpy(p->name, u->name, sizeof(u->name)); 1527 } 1528 1529 static void 1530 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) 1531 { 1532 u->laddr = p->laddr; 1533 u->raddr = p->raddr; 1534 u->flags = p->flags; 1535 u->hop_limit = p->hop_limit; 1536 u->encap_limit = p->encap_limit; 1537 u->flowinfo = p->flowinfo; 1538 u->link = p->link; 1539 u->proto = p->proto; 1540 memcpy(u->name, p->name, sizeof(u->name)); 1541 } 1542 1543 /** 1544 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace 1545 * @dev: virtual device associated with tunnel 1546 * @ifr: parameters passed from userspace 1547 * @cmd: command to be performed 1548 * 1549 * Description: 1550 * ip6_tnl_ioctl() is used for managing IPv6 tunnels 1551 * from userspace. 1552 * 1553 * The possible commands are the following: 1554 * %SIOCGETTUNNEL: get tunnel parameters for device 1555 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 1556 * %SIOCCHGTUNNEL: change tunnel parameters to those given 1557 * %SIOCDELTUNNEL: delete tunnel 1558 * 1559 * The fallback device "ip6tnl0", created during module 1560 * initialization, can be used for creating other tunnel devices. 1561 * 1562 * Return: 1563 * 0 on success, 1564 * %-EFAULT if unable to copy data to or from userspace, 1565 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 1566 * %-EINVAL if passed tunnel parameters are invalid, 1567 * %-EEXIST if changing a tunnel's parameters would cause a conflict 1568 * %-ENODEV if attempting to change or delete a nonexisting device 1569 **/ 1570 1571 static int 1572 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1573 { 1574 int err = 0; 1575 struct ip6_tnl_parm p; 1576 struct __ip6_tnl_parm p1; 1577 struct ip6_tnl *t = netdev_priv(dev); 1578 struct net *net = t->net; 1579 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1580 1581 memset(&p1, 0, sizeof(p1)); 1582 1583 switch (cmd) { 1584 case SIOCGETTUNNEL: 1585 if (dev == ip6n->fb_tnl_dev) { 1586 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1587 err = -EFAULT; 1588 break; 1589 } 1590 ip6_tnl_parm_from_user(&p1, &p); 1591 t = ip6_tnl_locate(net, &p1, 0); 1592 if (IS_ERR(t)) 1593 t = netdev_priv(dev); 1594 } else { 1595 memset(&p, 0, sizeof(p)); 1596 } 1597 ip6_tnl_parm_to_user(&p, &t->parms); 1598 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { 1599 err = -EFAULT; 1600 } 1601 break; 1602 case SIOCADDTUNNEL: 1603 case SIOCCHGTUNNEL: 1604 err = -EPERM; 1605 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1606 break; 1607 err = -EFAULT; 1608 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1609 break; 1610 err = -EINVAL; 1611 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 1612 p.proto != 0) 1613 break; 1614 ip6_tnl_parm_from_user(&p1, &p); 1615 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); 1616 if (cmd == SIOCCHGTUNNEL) { 1617 if (!IS_ERR(t)) { 1618 if (t->dev != dev) { 1619 err = -EEXIST; 1620 break; 1621 } 1622 } else 1623 t = netdev_priv(dev); 1624 if (dev == ip6n->fb_tnl_dev) 1625 err = ip6_tnl0_update(t, &p1); 1626 else 1627 err = ip6_tnl_update(t, &p1); 1628 } 1629 if (!IS_ERR(t)) { 1630 err = 0; 1631 ip6_tnl_parm_to_user(&p, &t->parms); 1632 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1633 err = -EFAULT; 1634 1635 } else { 1636 err = PTR_ERR(t); 1637 } 1638 break; 1639 case SIOCDELTUNNEL: 1640 err = -EPERM; 1641 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1642 break; 1643 1644 if (dev == ip6n->fb_tnl_dev) { 1645 err = -EFAULT; 1646 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1647 break; 1648 err = -ENOENT; 1649 ip6_tnl_parm_from_user(&p1, &p); 1650 t = ip6_tnl_locate(net, &p1, 0); 1651 if (IS_ERR(t)) 1652 break; 1653 err = -EPERM; 1654 if (t->dev == ip6n->fb_tnl_dev) 1655 break; 1656 dev = t->dev; 1657 } 1658 err = 0; 1659 unregister_netdevice(dev); 1660 break; 1661 default: 1662 err = -EINVAL; 1663 } 1664 return err; 1665 } 1666 1667 /** 1668 * ip6_tnl_change_mtu - change mtu manually for tunnel device 1669 * @dev: virtual device associated with tunnel 1670 * @new_mtu: the new mtu 1671 * 1672 * Return: 1673 * 0 on success, 1674 * %-EINVAL if mtu too small 1675 **/ 1676 1677 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) 1678 { 1679 struct ip6_tnl *tnl = netdev_priv(dev); 1680 1681 if (tnl->parms.proto == IPPROTO_IPV6) { 1682 if (new_mtu < IPV6_MIN_MTU) 1683 return -EINVAL; 1684 } else { 1685 if (new_mtu < ETH_MIN_MTU) 1686 return -EINVAL; 1687 } 1688 if (new_mtu > 0xFFF8 - dev->hard_header_len) 1689 return -EINVAL; 1690 dev->mtu = new_mtu; 1691 return 0; 1692 } 1693 EXPORT_SYMBOL(ip6_tnl_change_mtu); 1694 1695 int ip6_tnl_get_iflink(const struct net_device *dev) 1696 { 1697 struct ip6_tnl *t = netdev_priv(dev); 1698 1699 return t->parms.link; 1700 } 1701 EXPORT_SYMBOL(ip6_tnl_get_iflink); 1702 1703 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 1704 unsigned int num) 1705 { 1706 if (num >= MAX_IPTUN_ENCAP_OPS) 1707 return -ERANGE; 1708 1709 return !cmpxchg((const struct ip6_tnl_encap_ops **) 1710 &ip6tun_encaps[num], 1711 NULL, ops) ? 0 : -1; 1712 } 1713 EXPORT_SYMBOL(ip6_tnl_encap_add_ops); 1714 1715 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 1716 unsigned int num) 1717 { 1718 int ret; 1719 1720 if (num >= MAX_IPTUN_ENCAP_OPS) 1721 return -ERANGE; 1722 1723 ret = (cmpxchg((const struct ip6_tnl_encap_ops **) 1724 &ip6tun_encaps[num], 1725 ops, NULL) == ops) ? 0 : -1; 1726 1727 synchronize_net(); 1728 1729 return ret; 1730 } 1731 EXPORT_SYMBOL(ip6_tnl_encap_del_ops); 1732 1733 int ip6_tnl_encap_setup(struct ip6_tnl *t, 1734 struct ip_tunnel_encap *ipencap) 1735 { 1736 int hlen; 1737 1738 memset(&t->encap, 0, sizeof(t->encap)); 1739 1740 hlen = ip6_encap_hlen(ipencap); 1741 if (hlen < 0) 1742 return hlen; 1743 1744 t->encap.type = ipencap->type; 1745 t->encap.sport = ipencap->sport; 1746 t->encap.dport = ipencap->dport; 1747 t->encap.flags = ipencap->flags; 1748 1749 t->encap_hlen = hlen; 1750 t->hlen = t->encap_hlen + t->tun_hlen; 1751 1752 return 0; 1753 } 1754 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); 1755 1756 static const struct net_device_ops ip6_tnl_netdev_ops = { 1757 .ndo_init = ip6_tnl_dev_init, 1758 .ndo_uninit = ip6_tnl_dev_uninit, 1759 .ndo_start_xmit = ip6_tnl_start_xmit, 1760 .ndo_do_ioctl = ip6_tnl_ioctl, 1761 .ndo_change_mtu = ip6_tnl_change_mtu, 1762 .ndo_get_stats = ip6_get_stats, 1763 .ndo_get_iflink = ip6_tnl_get_iflink, 1764 }; 1765 1766 #define IPXIPX_FEATURES (NETIF_F_SG | \ 1767 NETIF_F_FRAGLIST | \ 1768 NETIF_F_HIGHDMA | \ 1769 NETIF_F_GSO_SOFTWARE | \ 1770 NETIF_F_HW_CSUM) 1771 1772 /** 1773 * ip6_tnl_dev_setup - setup virtual tunnel device 1774 * @dev: virtual device associated with tunnel 1775 * 1776 * Description: 1777 * Initialize function pointers and device parameters 1778 **/ 1779 1780 static void ip6_tnl_dev_setup(struct net_device *dev) 1781 { 1782 dev->netdev_ops = &ip6_tnl_netdev_ops; 1783 dev->needs_free_netdev = true; 1784 dev->priv_destructor = ip6_dev_free; 1785 1786 dev->type = ARPHRD_TUNNEL6; 1787 dev->flags |= IFF_NOARP; 1788 dev->addr_len = sizeof(struct in6_addr); 1789 dev->features |= NETIF_F_LLTX; 1790 netif_keep_dst(dev); 1791 1792 dev->features |= IPXIPX_FEATURES; 1793 dev->hw_features |= IPXIPX_FEATURES; 1794 1795 /* This perm addr will be used as interface identifier by IPv6 */ 1796 dev->addr_assign_type = NET_ADDR_RANDOM; 1797 eth_random_addr(dev->perm_addr); 1798 } 1799 1800 1801 /** 1802 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices 1803 * @dev: virtual device associated with tunnel 1804 **/ 1805 1806 static inline int 1807 ip6_tnl_dev_init_gen(struct net_device *dev) 1808 { 1809 struct ip6_tnl *t = netdev_priv(dev); 1810 int ret; 1811 int t_hlen; 1812 1813 t->dev = dev; 1814 t->net = dev_net(dev); 1815 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1816 if (!dev->tstats) 1817 return -ENOMEM; 1818 1819 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); 1820 if (ret) 1821 goto free_stats; 1822 1823 ret = gro_cells_init(&t->gro_cells, dev); 1824 if (ret) 1825 goto destroy_dst; 1826 1827 t->tun_hlen = 0; 1828 t->hlen = t->encap_hlen + t->tun_hlen; 1829 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1830 1831 dev->type = ARPHRD_TUNNEL6; 1832 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1833 dev->mtu = ETH_DATA_LEN - t_hlen; 1834 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1835 dev->mtu -= 8; 1836 dev->min_mtu = ETH_MIN_MTU; 1837 dev->max_mtu = 0xFFF8 - dev->hard_header_len; 1838 1839 return 0; 1840 1841 destroy_dst: 1842 dst_cache_destroy(&t->dst_cache); 1843 free_stats: 1844 free_percpu(dev->tstats); 1845 dev->tstats = NULL; 1846 1847 return ret; 1848 } 1849 1850 /** 1851 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices 1852 * @dev: virtual device associated with tunnel 1853 **/ 1854 1855 static int ip6_tnl_dev_init(struct net_device *dev) 1856 { 1857 struct ip6_tnl *t = netdev_priv(dev); 1858 int err = ip6_tnl_dev_init_gen(dev); 1859 1860 if (err) 1861 return err; 1862 ip6_tnl_link_config(t); 1863 if (t->parms.collect_md) { 1864 dev->features |= NETIF_F_NETNS_LOCAL; 1865 netif_keep_dst(dev); 1866 } 1867 return 0; 1868 } 1869 1870 /** 1871 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device 1872 * @dev: fallback device 1873 * 1874 * Return: 0 1875 **/ 1876 1877 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) 1878 { 1879 struct ip6_tnl *t = netdev_priv(dev); 1880 struct net *net = dev_net(dev); 1881 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1882 1883 t->parms.proto = IPPROTO_IPV6; 1884 dev_hold(dev); 1885 1886 rcu_assign_pointer(ip6n->tnls_wc[0], t); 1887 return 0; 1888 } 1889 1890 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[], 1891 struct netlink_ext_ack *extack) 1892 { 1893 u8 proto; 1894 1895 if (!data || !data[IFLA_IPTUN_PROTO]) 1896 return 0; 1897 1898 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1899 if (proto != IPPROTO_IPV6 && 1900 proto != IPPROTO_IPIP && 1901 proto != 0) 1902 return -EINVAL; 1903 1904 return 0; 1905 } 1906 1907 static void ip6_tnl_netlink_parms(struct nlattr *data[], 1908 struct __ip6_tnl_parm *parms) 1909 { 1910 memset(parms, 0, sizeof(*parms)); 1911 1912 if (!data) 1913 return; 1914 1915 if (data[IFLA_IPTUN_LINK]) 1916 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1917 1918 if (data[IFLA_IPTUN_LOCAL]) 1919 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); 1920 1921 if (data[IFLA_IPTUN_REMOTE]) 1922 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); 1923 1924 if (data[IFLA_IPTUN_TTL]) 1925 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); 1926 1927 if (data[IFLA_IPTUN_ENCAP_LIMIT]) 1928 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); 1929 1930 if (data[IFLA_IPTUN_FLOWINFO]) 1931 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); 1932 1933 if (data[IFLA_IPTUN_FLAGS]) 1934 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); 1935 1936 if (data[IFLA_IPTUN_PROTO]) 1937 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1938 1939 if (data[IFLA_IPTUN_COLLECT_METADATA]) 1940 parms->collect_md = true; 1941 1942 if (data[IFLA_IPTUN_FWMARK]) 1943 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1944 } 1945 1946 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], 1947 struct ip_tunnel_encap *ipencap) 1948 { 1949 bool ret = false; 1950 1951 memset(ipencap, 0, sizeof(*ipencap)); 1952 1953 if (!data) 1954 return ret; 1955 1956 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1957 ret = true; 1958 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1959 } 1960 1961 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1962 ret = true; 1963 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1964 } 1965 1966 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1967 ret = true; 1968 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1969 } 1970 1971 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1972 ret = true; 1973 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1974 } 1975 1976 return ret; 1977 } 1978 1979 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, 1980 struct nlattr *tb[], struct nlattr *data[], 1981 struct netlink_ext_ack *extack) 1982 { 1983 struct net *net = dev_net(dev); 1984 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1985 struct ip6_tnl *nt, *t; 1986 struct ip_tunnel_encap ipencap; 1987 1988 nt = netdev_priv(dev); 1989 1990 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 1991 int err = ip6_tnl_encap_setup(nt, &ipencap); 1992 1993 if (err < 0) 1994 return err; 1995 } 1996 1997 ip6_tnl_netlink_parms(data, &nt->parms); 1998 1999 if (nt->parms.collect_md) { 2000 if (rtnl_dereference(ip6n->collect_md_tun)) 2001 return -EEXIST; 2002 } else { 2003 t = ip6_tnl_locate(net, &nt->parms, 0); 2004 if (!IS_ERR(t)) 2005 return -EEXIST; 2006 } 2007 2008 return ip6_tnl_create2(dev); 2009 } 2010 2011 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], 2012 struct nlattr *data[], 2013 struct netlink_ext_ack *extack) 2014 { 2015 struct ip6_tnl *t = netdev_priv(dev); 2016 struct __ip6_tnl_parm p; 2017 struct net *net = t->net; 2018 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2019 struct ip_tunnel_encap ipencap; 2020 2021 if (dev == ip6n->fb_tnl_dev) 2022 return -EINVAL; 2023 2024 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 2025 int err = ip6_tnl_encap_setup(t, &ipencap); 2026 2027 if (err < 0) 2028 return err; 2029 } 2030 ip6_tnl_netlink_parms(data, &p); 2031 if (p.collect_md) 2032 return -EINVAL; 2033 2034 t = ip6_tnl_locate(net, &p, 0); 2035 if (!IS_ERR(t)) { 2036 if (t->dev != dev) 2037 return -EEXIST; 2038 } else 2039 t = netdev_priv(dev); 2040 2041 return ip6_tnl_update(t, &p); 2042 } 2043 2044 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) 2045 { 2046 struct net *net = dev_net(dev); 2047 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2048 2049 if (dev != ip6n->fb_tnl_dev) 2050 unregister_netdevice_queue(dev, head); 2051 } 2052 2053 static size_t ip6_tnl_get_size(const struct net_device *dev) 2054 { 2055 return 2056 /* IFLA_IPTUN_LINK */ 2057 nla_total_size(4) + 2058 /* IFLA_IPTUN_LOCAL */ 2059 nla_total_size(sizeof(struct in6_addr)) + 2060 /* IFLA_IPTUN_REMOTE */ 2061 nla_total_size(sizeof(struct in6_addr)) + 2062 /* IFLA_IPTUN_TTL */ 2063 nla_total_size(1) + 2064 /* IFLA_IPTUN_ENCAP_LIMIT */ 2065 nla_total_size(1) + 2066 /* IFLA_IPTUN_FLOWINFO */ 2067 nla_total_size(4) + 2068 /* IFLA_IPTUN_FLAGS */ 2069 nla_total_size(4) + 2070 /* IFLA_IPTUN_PROTO */ 2071 nla_total_size(1) + 2072 /* IFLA_IPTUN_ENCAP_TYPE */ 2073 nla_total_size(2) + 2074 /* IFLA_IPTUN_ENCAP_FLAGS */ 2075 nla_total_size(2) + 2076 /* IFLA_IPTUN_ENCAP_SPORT */ 2077 nla_total_size(2) + 2078 /* IFLA_IPTUN_ENCAP_DPORT */ 2079 nla_total_size(2) + 2080 /* IFLA_IPTUN_COLLECT_METADATA */ 2081 nla_total_size(0) + 2082 /* IFLA_IPTUN_FWMARK */ 2083 nla_total_size(4) + 2084 0; 2085 } 2086 2087 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) 2088 { 2089 struct ip6_tnl *tunnel = netdev_priv(dev); 2090 struct __ip6_tnl_parm *parm = &tunnel->parms; 2091 2092 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 2093 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || 2094 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || 2095 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || 2096 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || 2097 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || 2098 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || 2099 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) || 2100 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark)) 2101 goto nla_put_failure; 2102 2103 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || 2104 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) || 2105 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || 2106 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) 2107 goto nla_put_failure; 2108 2109 if (parm->collect_md) 2110 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) 2111 goto nla_put_failure; 2112 2113 return 0; 2114 2115 nla_put_failure: 2116 return -EMSGSIZE; 2117 } 2118 2119 struct net *ip6_tnl_get_link_net(const struct net_device *dev) 2120 { 2121 struct ip6_tnl *tunnel = netdev_priv(dev); 2122 2123 return tunnel->net; 2124 } 2125 EXPORT_SYMBOL(ip6_tnl_get_link_net); 2126 2127 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { 2128 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 2129 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, 2130 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, 2131 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 2132 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, 2133 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, 2134 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, 2135 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 2136 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 2137 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 2138 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 2139 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 2140 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, 2141 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 2142 }; 2143 2144 static struct rtnl_link_ops ip6_link_ops __read_mostly = { 2145 .kind = "ip6tnl", 2146 .maxtype = IFLA_IPTUN_MAX, 2147 .policy = ip6_tnl_policy, 2148 .priv_size = sizeof(struct ip6_tnl), 2149 .setup = ip6_tnl_dev_setup, 2150 .validate = ip6_tnl_validate, 2151 .newlink = ip6_tnl_newlink, 2152 .changelink = ip6_tnl_changelink, 2153 .dellink = ip6_tnl_dellink, 2154 .get_size = ip6_tnl_get_size, 2155 .fill_info = ip6_tnl_fill_info, 2156 .get_link_net = ip6_tnl_get_link_net, 2157 }; 2158 2159 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { 2160 .handler = ip4ip6_rcv, 2161 .err_handler = ip4ip6_err, 2162 .priority = 1, 2163 }; 2164 2165 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { 2166 .handler = ip6ip6_rcv, 2167 .err_handler = ip6ip6_err, 2168 .priority = 1, 2169 }; 2170 2171 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list) 2172 { 2173 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2174 struct net_device *dev, *aux; 2175 int h; 2176 struct ip6_tnl *t; 2177 2178 for_each_netdev_safe(net, dev, aux) 2179 if (dev->rtnl_link_ops == &ip6_link_ops) 2180 unregister_netdevice_queue(dev, list); 2181 2182 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) { 2183 t = rtnl_dereference(ip6n->tnls_r_l[h]); 2184 while (t) { 2185 /* If dev is in the same netns, it has already 2186 * been added to the list by the previous loop. 2187 */ 2188 if (!net_eq(dev_net(t->dev), net)) 2189 unregister_netdevice_queue(t->dev, list); 2190 t = rtnl_dereference(t->next); 2191 } 2192 } 2193 } 2194 2195 static int __net_init ip6_tnl_init_net(struct net *net) 2196 { 2197 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2198 struct ip6_tnl *t = NULL; 2199 int err; 2200 2201 ip6n->tnls[0] = ip6n->tnls_wc; 2202 ip6n->tnls[1] = ip6n->tnls_r_l; 2203 2204 err = -ENOMEM; 2205 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", 2206 NET_NAME_UNKNOWN, ip6_tnl_dev_setup); 2207 2208 if (!ip6n->fb_tnl_dev) 2209 goto err_alloc_dev; 2210 dev_net_set(ip6n->fb_tnl_dev, net); 2211 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; 2212 /* FB netdevice is special: we have one, and only one per netns. 2213 * Allowing to move it to another netns is clearly unsafe. 2214 */ 2215 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; 2216 2217 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); 2218 if (err < 0) 2219 goto err_register; 2220 2221 err = register_netdev(ip6n->fb_tnl_dev); 2222 if (err < 0) 2223 goto err_register; 2224 2225 t = netdev_priv(ip6n->fb_tnl_dev); 2226 2227 strcpy(t->parms.name, ip6n->fb_tnl_dev->name); 2228 return 0; 2229 2230 err_register: 2231 free_netdev(ip6n->fb_tnl_dev); 2232 err_alloc_dev: 2233 return err; 2234 } 2235 2236 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list) 2237 { 2238 struct net *net; 2239 LIST_HEAD(list); 2240 2241 rtnl_lock(); 2242 list_for_each_entry(net, net_list, exit_list) 2243 ip6_tnl_destroy_tunnels(net, &list); 2244 unregister_netdevice_many(&list); 2245 rtnl_unlock(); 2246 } 2247 2248 static struct pernet_operations ip6_tnl_net_ops = { 2249 .init = ip6_tnl_init_net, 2250 .exit_batch = ip6_tnl_exit_batch_net, 2251 .id = &ip6_tnl_net_id, 2252 .size = sizeof(struct ip6_tnl_net), 2253 }; 2254 2255 /** 2256 * ip6_tunnel_init - register protocol and reserve needed resources 2257 * 2258 * Return: 0 on success 2259 **/ 2260 2261 static int __init ip6_tunnel_init(void) 2262 { 2263 int err; 2264 2265 if (!ipv6_mod_enabled()) 2266 return -EOPNOTSUPP; 2267 2268 err = register_pernet_device(&ip6_tnl_net_ops); 2269 if (err < 0) 2270 goto out_pernet; 2271 2272 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); 2273 if (err < 0) { 2274 pr_err("%s: can't register ip4ip6\n", __func__); 2275 goto out_ip4ip6; 2276 } 2277 2278 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); 2279 if (err < 0) { 2280 pr_err("%s: can't register ip6ip6\n", __func__); 2281 goto out_ip6ip6; 2282 } 2283 err = rtnl_link_register(&ip6_link_ops); 2284 if (err < 0) 2285 goto rtnl_link_failed; 2286 2287 return 0; 2288 2289 rtnl_link_failed: 2290 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); 2291 out_ip6ip6: 2292 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); 2293 out_ip4ip6: 2294 unregister_pernet_device(&ip6_tnl_net_ops); 2295 out_pernet: 2296 return err; 2297 } 2298 2299 /** 2300 * ip6_tunnel_cleanup - free resources and unregister protocol 2301 **/ 2302 2303 static void __exit ip6_tunnel_cleanup(void) 2304 { 2305 rtnl_link_unregister(&ip6_link_ops); 2306 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) 2307 pr_info("%s: can't deregister ip4ip6\n", __func__); 2308 2309 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) 2310 pr_info("%s: can't deregister ip6ip6\n", __func__); 2311 2312 unregister_pernet_device(&ip6_tnl_net_ops); 2313 } 2314 2315 module_init(ip6_tunnel_init); 2316 module_exit(ip6_tunnel_cleanup); 2317