1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 tunneling device 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Ville Nuorvala <vnuorval@tcs.hut.fi> 8 * Yasuyuki Kozakai <kozakai@linux-ipv6.org> 9 * 10 * Based on: 11 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c 12 * 13 * RFC 2473 14 */ 15 16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18 #include <linux/module.h> 19 #include <linux/capability.h> 20 #include <linux/errno.h> 21 #include <linux/types.h> 22 #include <linux/sockios.h> 23 #include <linux/icmp.h> 24 #include <linux/if.h> 25 #include <linux/in.h> 26 #include <linux/ip.h> 27 #include <linux/net.h> 28 #include <linux/in6.h> 29 #include <linux/netdevice.h> 30 #include <linux/if_arp.h> 31 #include <linux/icmpv6.h> 32 #include <linux/init.h> 33 #include <linux/route.h> 34 #include <linux/rtnetlink.h> 35 #include <linux/netfilter_ipv6.h> 36 #include <linux/slab.h> 37 #include <linux/hash.h> 38 #include <linux/etherdevice.h> 39 40 #include <linux/uaccess.h> 41 #include <linux/atomic.h> 42 43 #include <net/icmp.h> 44 #include <net/ip.h> 45 #include <net/ip_tunnels.h> 46 #include <net/ipv6.h> 47 #include <net/ip6_route.h> 48 #include <net/addrconf.h> 49 #include <net/ip6_tunnel.h> 50 #include <net/xfrm.h> 51 #include <net/dsfield.h> 52 #include <net/inet_ecn.h> 53 #include <net/net_namespace.h> 54 #include <net/netns/generic.h> 55 #include <net/dst_metadata.h> 56 57 MODULE_AUTHOR("Ville Nuorvala"); 58 MODULE_DESCRIPTION("IPv6 tunneling device"); 59 MODULE_LICENSE("GPL"); 60 MODULE_ALIAS_RTNL_LINK("ip6tnl"); 61 MODULE_ALIAS_NETDEV("ip6tnl0"); 62 63 #define IP6_TUNNEL_HASH_SIZE_SHIFT 5 64 #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT) 65 66 static bool log_ecn_error = true; 67 module_param(log_ecn_error, bool, 0644); 68 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 69 70 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) 71 { 72 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); 73 74 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT); 75 } 76 77 static int ip6_tnl_dev_init(struct net_device *dev); 78 static void ip6_tnl_dev_setup(struct net_device *dev); 79 static struct rtnl_link_ops ip6_link_ops __read_mostly; 80 81 static unsigned int ip6_tnl_net_id __read_mostly; 82 struct ip6_tnl_net { 83 /* the IPv6 tunnel fallback device */ 84 struct net_device *fb_tnl_dev; 85 /* lists for storing tunnels in use */ 86 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE]; 87 struct ip6_tnl __rcu *tnls_wc[1]; 88 struct ip6_tnl __rcu **tnls[2]; 89 struct ip6_tnl __rcu *collect_md_tun; 90 }; 91 92 static struct net_device_stats *ip6_get_stats(struct net_device *dev) 93 { 94 struct pcpu_sw_netstats tmp, sum = { 0 }; 95 int i; 96 97 for_each_possible_cpu(i) { 98 unsigned int start; 99 const struct pcpu_sw_netstats *tstats = 100 per_cpu_ptr(dev->tstats, i); 101 102 do { 103 start = u64_stats_fetch_begin_irq(&tstats->syncp); 104 tmp.rx_packets = tstats->rx_packets; 105 tmp.rx_bytes = tstats->rx_bytes; 106 tmp.tx_packets = tstats->tx_packets; 107 tmp.tx_bytes = tstats->tx_bytes; 108 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); 109 110 sum.rx_packets += tmp.rx_packets; 111 sum.rx_bytes += tmp.rx_bytes; 112 sum.tx_packets += tmp.tx_packets; 113 sum.tx_bytes += tmp.tx_bytes; 114 } 115 dev->stats.rx_packets = sum.rx_packets; 116 dev->stats.rx_bytes = sum.rx_bytes; 117 dev->stats.tx_packets = sum.tx_packets; 118 dev->stats.tx_bytes = sum.tx_bytes; 119 return &dev->stats; 120 } 121 122 /** 123 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses 124 * @remote: the address of the tunnel exit-point 125 * @local: the address of the tunnel entry-point 126 * 127 * Return: 128 * tunnel matching given end-points if found, 129 * else fallback tunnel if its device is up, 130 * else %NULL 131 **/ 132 133 #define for_each_ip6_tunnel_rcu(start) \ 134 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) 135 136 static struct ip6_tnl * 137 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) 138 { 139 unsigned int hash = HASH(remote, local); 140 struct ip6_tnl *t; 141 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 142 struct in6_addr any; 143 144 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 145 if (ipv6_addr_equal(local, &t->parms.laddr) && 146 ipv6_addr_equal(remote, &t->parms.raddr) && 147 (t->dev->flags & IFF_UP)) 148 return t; 149 } 150 151 memset(&any, 0, sizeof(any)); 152 hash = HASH(&any, local); 153 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 154 if (ipv6_addr_equal(local, &t->parms.laddr) && 155 ipv6_addr_any(&t->parms.raddr) && 156 (t->dev->flags & IFF_UP)) 157 return t; 158 } 159 160 hash = HASH(remote, &any); 161 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 162 if (ipv6_addr_equal(remote, &t->parms.raddr) && 163 ipv6_addr_any(&t->parms.laddr) && 164 (t->dev->flags & IFF_UP)) 165 return t; 166 } 167 168 t = rcu_dereference(ip6n->collect_md_tun); 169 if (t && t->dev->flags & IFF_UP) 170 return t; 171 172 t = rcu_dereference(ip6n->tnls_wc[0]); 173 if (t && (t->dev->flags & IFF_UP)) 174 return t; 175 176 return NULL; 177 } 178 179 /** 180 * ip6_tnl_bucket - get head of list matching given tunnel parameters 181 * @p: parameters containing tunnel end-points 182 * 183 * Description: 184 * ip6_tnl_bucket() returns the head of the list matching the 185 * &struct in6_addr entries laddr and raddr in @p. 186 * 187 * Return: head of IPv6 tunnel list 188 **/ 189 190 static struct ip6_tnl __rcu ** 191 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) 192 { 193 const struct in6_addr *remote = &p->raddr; 194 const struct in6_addr *local = &p->laddr; 195 unsigned int h = 0; 196 int prio = 0; 197 198 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { 199 prio = 1; 200 h = HASH(remote, local); 201 } 202 return &ip6n->tnls[prio][h]; 203 } 204 205 /** 206 * ip6_tnl_link - add tunnel to hash table 207 * @t: tunnel to be added 208 **/ 209 210 static void 211 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 212 { 213 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); 214 215 if (t->parms.collect_md) 216 rcu_assign_pointer(ip6n->collect_md_tun, t); 217 rcu_assign_pointer(t->next , rtnl_dereference(*tp)); 218 rcu_assign_pointer(*tp, t); 219 } 220 221 /** 222 * ip6_tnl_unlink - remove tunnel from hash table 223 * @t: tunnel to be removed 224 **/ 225 226 static void 227 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 228 { 229 struct ip6_tnl __rcu **tp; 230 struct ip6_tnl *iter; 231 232 if (t->parms.collect_md) 233 rcu_assign_pointer(ip6n->collect_md_tun, NULL); 234 235 for (tp = ip6_tnl_bucket(ip6n, &t->parms); 236 (iter = rtnl_dereference(*tp)) != NULL; 237 tp = &iter->next) { 238 if (t == iter) { 239 rcu_assign_pointer(*tp, t->next); 240 break; 241 } 242 } 243 } 244 245 static void ip6_dev_free(struct net_device *dev) 246 { 247 struct ip6_tnl *t = netdev_priv(dev); 248 249 gro_cells_destroy(&t->gro_cells); 250 dst_cache_destroy(&t->dst_cache); 251 free_percpu(dev->tstats); 252 } 253 254 static int ip6_tnl_create2(struct net_device *dev) 255 { 256 struct ip6_tnl *t = netdev_priv(dev); 257 struct net *net = dev_net(dev); 258 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 259 int err; 260 261 t = netdev_priv(dev); 262 263 dev->rtnl_link_ops = &ip6_link_ops; 264 err = register_netdevice(dev); 265 if (err < 0) 266 goto out; 267 268 strcpy(t->parms.name, dev->name); 269 270 dev_hold(dev); 271 ip6_tnl_link(ip6n, t); 272 return 0; 273 274 out: 275 return err; 276 } 277 278 /** 279 * ip6_tnl_create - create a new tunnel 280 * @p: tunnel parameters 281 * @pt: pointer to new tunnel 282 * 283 * Description: 284 * Create tunnel matching given parameters. 285 * 286 * Return: 287 * created tunnel or error pointer 288 **/ 289 290 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) 291 { 292 struct net_device *dev; 293 struct ip6_tnl *t; 294 char name[IFNAMSIZ]; 295 int err = -E2BIG; 296 297 if (p->name[0]) { 298 if (!dev_valid_name(p->name)) 299 goto failed; 300 strlcpy(name, p->name, IFNAMSIZ); 301 } else { 302 sprintf(name, "ip6tnl%%d"); 303 } 304 err = -ENOMEM; 305 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 306 ip6_tnl_dev_setup); 307 if (!dev) 308 goto failed; 309 310 dev_net_set(dev, net); 311 312 t = netdev_priv(dev); 313 t->parms = *p; 314 t->net = dev_net(dev); 315 err = ip6_tnl_create2(dev); 316 if (err < 0) 317 goto failed_free; 318 319 return t; 320 321 failed_free: 322 free_netdev(dev); 323 failed: 324 return ERR_PTR(err); 325 } 326 327 /** 328 * ip6_tnl_locate - find or create tunnel matching given parameters 329 * @p: tunnel parameters 330 * @create: != 0 if allowed to create new tunnel if no match found 331 * 332 * Description: 333 * ip6_tnl_locate() first tries to locate an existing tunnel 334 * based on @parms. If this is unsuccessful, but @create is set a new 335 * tunnel device is created and registered for use. 336 * 337 * Return: 338 * matching tunnel or error pointer 339 **/ 340 341 static struct ip6_tnl *ip6_tnl_locate(struct net *net, 342 struct __ip6_tnl_parm *p, int create) 343 { 344 const struct in6_addr *remote = &p->raddr; 345 const struct in6_addr *local = &p->laddr; 346 struct ip6_tnl __rcu **tp; 347 struct ip6_tnl *t; 348 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 349 350 for (tp = ip6_tnl_bucket(ip6n, p); 351 (t = rtnl_dereference(*tp)) != NULL; 352 tp = &t->next) { 353 if (ipv6_addr_equal(local, &t->parms.laddr) && 354 ipv6_addr_equal(remote, &t->parms.raddr)) { 355 if (create) 356 return ERR_PTR(-EEXIST); 357 358 return t; 359 } 360 } 361 if (!create) 362 return ERR_PTR(-ENODEV); 363 return ip6_tnl_create(net, p); 364 } 365 366 /** 367 * ip6_tnl_dev_uninit - tunnel device uninitializer 368 * @dev: the device to be destroyed 369 * 370 * Description: 371 * ip6_tnl_dev_uninit() removes tunnel from its list 372 **/ 373 374 static void 375 ip6_tnl_dev_uninit(struct net_device *dev) 376 { 377 struct ip6_tnl *t = netdev_priv(dev); 378 struct net *net = t->net; 379 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 380 381 if (dev == ip6n->fb_tnl_dev) 382 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); 383 else 384 ip6_tnl_unlink(ip6n, t); 385 dst_cache_reset(&t->dst_cache); 386 dev_put(dev); 387 } 388 389 /** 390 * parse_tvl_tnl_enc_lim - handle encapsulation limit option 391 * @skb: received socket buffer 392 * 393 * Return: 394 * 0 if none was found, 395 * else index to encapsulation limit 396 **/ 397 398 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) 399 { 400 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw; 401 unsigned int nhoff = raw - skb->data; 402 unsigned int off = nhoff + sizeof(*ipv6h); 403 u8 next, nexthdr = ipv6h->nexthdr; 404 405 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { 406 struct ipv6_opt_hdr *hdr; 407 u16 optlen; 408 409 if (!pskb_may_pull(skb, off + sizeof(*hdr))) 410 break; 411 412 hdr = (struct ipv6_opt_hdr *)(skb->data + 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 /* cache hdr->nexthdr, since pskb_may_pull() might 424 * invalidate hdr 425 */ 426 next = hdr->nexthdr; 427 if (nexthdr == NEXTHDR_DEST) { 428 u16 i = 2; 429 430 /* Remember : hdr is no longer valid at this point. */ 431 if (!pskb_may_pull(skb, off + optlen)) 432 break; 433 434 while (1) { 435 struct ipv6_tlv_tnl_enc_lim *tel; 436 437 /* No more room for encapsulation limit */ 438 if (i + sizeof(*tel) > optlen) 439 break; 440 441 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i); 442 /* return index of option if found and valid */ 443 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && 444 tel->length == 1) 445 return i + off - nhoff; 446 /* else jump to next option */ 447 if (tel->type) 448 i += tel->length + 2; 449 else 450 i++; 451 } 452 } 453 nexthdr = next; 454 off += optlen; 455 } 456 return 0; 457 } 458 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); 459 460 /** 461 * ip6_tnl_err - tunnel error handler 462 * 463 * Description: 464 * ip6_tnl_err() should handle errors in the tunnel according 465 * to the specifications in RFC 2473. 466 **/ 467 468 static int 469 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, 470 u8 *type, u8 *code, int *msg, __u32 *info, int offset) 471 { 472 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; 473 struct net *net = dev_net(skb->dev); 474 u8 rel_type = ICMPV6_DEST_UNREACH; 475 u8 rel_code = ICMPV6_ADDR_UNREACH; 476 __u32 rel_info = 0; 477 struct ip6_tnl *t; 478 int err = -ENOENT; 479 int rel_msg = 0; 480 u8 tproto; 481 __u16 len; 482 483 /* If the packet doesn't contain the original IPv6 header we are 484 in trouble since we might need the source address for further 485 processing of the error. */ 486 487 rcu_read_lock(); 488 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); 489 if (!t) 490 goto out; 491 492 tproto = READ_ONCE(t->parms.proto); 493 if (tproto != ipproto && tproto != 0) 494 goto out; 495 496 err = 0; 497 498 switch (*type) { 499 struct ipv6_tlv_tnl_enc_lim *tel; 500 __u32 mtu, teli; 501 case ICMPV6_DEST_UNREACH: 502 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 503 t->parms.name); 504 rel_msg = 1; 505 break; 506 case ICMPV6_TIME_EXCEED: 507 if ((*code) == ICMPV6_EXC_HOPLIMIT) { 508 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 509 t->parms.name); 510 rel_msg = 1; 511 } 512 break; 513 case ICMPV6_PARAMPROB: 514 teli = 0; 515 if ((*code) == ICMPV6_HDR_FIELD) 516 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 517 518 if (teli && teli == *info - 2) { 519 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 520 if (tel->encap_limit == 0) { 521 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 522 t->parms.name); 523 rel_msg = 1; 524 } 525 } else { 526 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 527 t->parms.name); 528 } 529 break; 530 case ICMPV6_PKT_TOOBIG: 531 ip6_update_pmtu(skb, net, htonl(*info), 0, 0, 532 sock_net_uid(net, NULL)); 533 mtu = *info - offset; 534 if (mtu < IPV6_MIN_MTU) 535 mtu = IPV6_MIN_MTU; 536 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); 537 if (len > mtu) { 538 rel_type = ICMPV6_PKT_TOOBIG; 539 rel_code = 0; 540 rel_info = mtu; 541 rel_msg = 1; 542 } 543 break; 544 case NDISC_REDIRECT: 545 ip6_redirect(skb, net, skb->dev->ifindex, 0, 546 sock_net_uid(net, NULL)); 547 break; 548 } 549 550 *type = rel_type; 551 *code = rel_code; 552 *info = rel_info; 553 *msg = rel_msg; 554 555 out: 556 rcu_read_unlock(); 557 return err; 558 } 559 560 static int 561 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 562 u8 type, u8 code, int offset, __be32 info) 563 { 564 __u32 rel_info = ntohl(info); 565 const struct iphdr *eiph; 566 struct sk_buff *skb2; 567 int err, rel_msg = 0; 568 u8 rel_type = type; 569 u8 rel_code = code; 570 struct rtable *rt; 571 struct flowi4 fl4; 572 573 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, 574 &rel_msg, &rel_info, offset); 575 if (err < 0) 576 return err; 577 578 if (rel_msg == 0) 579 return 0; 580 581 switch (rel_type) { 582 case ICMPV6_DEST_UNREACH: 583 if (rel_code != ICMPV6_ADDR_UNREACH) 584 return 0; 585 rel_type = ICMP_DEST_UNREACH; 586 rel_code = ICMP_HOST_UNREACH; 587 break; 588 case ICMPV6_PKT_TOOBIG: 589 if (rel_code != 0) 590 return 0; 591 rel_type = ICMP_DEST_UNREACH; 592 rel_code = ICMP_FRAG_NEEDED; 593 break; 594 default: 595 return 0; 596 } 597 598 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) 599 return 0; 600 601 skb2 = skb_clone(skb, GFP_ATOMIC); 602 if (!skb2) 603 return 0; 604 605 skb_dst_drop(skb2); 606 607 skb_pull(skb2, offset); 608 skb_reset_network_header(skb2); 609 eiph = ip_hdr(skb2); 610 611 /* Try to guess incoming interface */ 612 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr, 613 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 614 if (IS_ERR(rt)) 615 goto out; 616 617 skb2->dev = rt->dst.dev; 618 ip_rt_put(rt); 619 620 /* route "incoming" packet */ 621 if (rt->rt_flags & RTCF_LOCAL) { 622 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, 623 eiph->daddr, eiph->saddr, 0, 0, 624 IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 625 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) { 626 if (!IS_ERR(rt)) 627 ip_rt_put(rt); 628 goto out; 629 } 630 skb_dst_set(skb2, &rt->dst); 631 } else { 632 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, 633 skb2->dev) || 634 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6) 635 goto out; 636 } 637 638 /* change mtu on this route */ 639 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { 640 if (rel_info > dst_mtu(skb_dst(skb2))) 641 goto out; 642 643 skb_dst_update_pmtu(skb2, rel_info); 644 } 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 __u32 rel_info = ntohl(info); 658 int err, rel_msg = 0; 659 u8 rel_type = type; 660 u8 rel_code = code; 661 662 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, 663 &rel_msg, &rel_info, offset); 664 if (err < 0) 665 return err; 666 667 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { 668 struct rt6_info *rt; 669 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 670 671 if (!skb2) 672 return 0; 673 674 skb_dst_drop(skb2); 675 skb_pull(skb2, offset); 676 skb_reset_network_header(skb2); 677 678 /* Try to guess incoming interface */ 679 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, 680 NULL, 0, skb2, 0); 681 682 if (rt && rt->dst.dev) 683 skb2->dev = rt->dst.dev; 684 685 icmpv6_send(skb2, rel_type, rel_code, rel_info); 686 687 ip6_rt_put(rt); 688 689 kfree_skb(skb2); 690 } 691 692 return 0; 693 } 694 695 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 696 const struct ipv6hdr *ipv6h, 697 struct sk_buff *skb) 698 { 699 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; 700 701 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 702 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); 703 704 return IP6_ECN_decapsulate(ipv6h, skb); 705 } 706 707 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 708 const struct ipv6hdr *ipv6h, 709 struct sk_buff *skb) 710 { 711 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 712 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); 713 714 return IP6_ECN_decapsulate(ipv6h, skb); 715 } 716 717 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, 718 const struct in6_addr *laddr, 719 const struct in6_addr *raddr) 720 { 721 struct __ip6_tnl_parm *p = &t->parms; 722 int ltype = ipv6_addr_type(laddr); 723 int rtype = ipv6_addr_type(raddr); 724 __u32 flags = 0; 725 726 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { 727 flags = IP6_TNL_F_CAP_PER_PACKET; 728 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 729 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 730 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && 731 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { 732 if (ltype&IPV6_ADDR_UNICAST) 733 flags |= IP6_TNL_F_CAP_XMIT; 734 if (rtype&IPV6_ADDR_UNICAST) 735 flags |= IP6_TNL_F_CAP_RCV; 736 } 737 return flags; 738 } 739 EXPORT_SYMBOL(ip6_tnl_get_cap); 740 741 /* called with rcu_read_lock() */ 742 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, 743 const struct in6_addr *laddr, 744 const struct in6_addr *raddr) 745 { 746 struct __ip6_tnl_parm *p = &t->parms; 747 int ret = 0; 748 struct net *net = t->net; 749 750 if ((p->flags & IP6_TNL_F_CAP_RCV) || 751 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 752 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { 753 struct net_device *ldev = NULL; 754 755 if (p->link) 756 ldev = dev_get_by_index_rcu(net, p->link); 757 758 if ((ipv6_addr_is_multicast(laddr) || 759 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false, 760 0, IFA_F_TENTATIVE))) && 761 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) || 762 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true, 763 0, IFA_F_TENTATIVE)))) 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 ipv6h = ipv6_hdr(skb); 900 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) 901 goto drop; 902 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 903 goto drop; 904 if (t->parms.collect_md) { 905 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0); 906 if (!tun_dst) 907 goto drop; 908 } 909 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, 910 log_ecn_error); 911 } 912 913 rcu_read_unlock(); 914 915 return ret; 916 917 drop: 918 rcu_read_unlock(); 919 kfree_skb(skb); 920 return 0; 921 } 922 923 static int ip4ip6_rcv(struct sk_buff *skb) 924 { 925 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4, 926 ip4ip6_dscp_ecn_decapsulate); 927 } 928 929 static int ip6ip6_rcv(struct sk_buff *skb) 930 { 931 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, 932 ip6ip6_dscp_ecn_decapsulate); 933 } 934 935 struct ipv6_tel_txoption { 936 struct ipv6_txoptions ops; 937 __u8 dst_opt[8]; 938 }; 939 940 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) 941 { 942 memset(opt, 0, sizeof(struct ipv6_tel_txoption)); 943 944 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; 945 opt->dst_opt[3] = 1; 946 opt->dst_opt[4] = encap_limit; 947 opt->dst_opt[5] = IPV6_TLV_PADN; 948 opt->dst_opt[6] = 1; 949 950 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt; 951 opt->ops.opt_nflen = 8; 952 } 953 954 /** 955 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 956 * @t: the outgoing tunnel device 957 * @hdr: IPv6 header from the incoming packet 958 * 959 * Description: 960 * Avoid trivial tunneling loop by checking that tunnel exit-point 961 * doesn't match source of incoming packet. 962 * 963 * Return: 964 * 1 if conflict, 965 * 0 else 966 **/ 967 968 static inline bool 969 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) 970 { 971 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 972 } 973 974 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, 975 const struct in6_addr *laddr, 976 const struct in6_addr *raddr) 977 { 978 struct __ip6_tnl_parm *p = &t->parms; 979 int ret = 0; 980 struct net *net = t->net; 981 982 if (t->parms.collect_md) 983 return 1; 984 985 if ((p->flags & IP6_TNL_F_CAP_XMIT) || 986 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 987 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { 988 struct net_device *ldev = NULL; 989 990 rcu_read_lock(); 991 if (p->link) 992 ldev = dev_get_by_index_rcu(net, p->link); 993 994 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false, 995 0, IFA_F_TENTATIVE))) 996 pr_warn("%s xmit: Local address not yet configured!\n", 997 p->name); 998 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) && 999 !ipv6_addr_is_multicast(raddr) && 1000 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev, 1001 true, 0, IFA_F_TENTATIVE))) 1002 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", 1003 p->name); 1004 else 1005 ret = 1; 1006 rcu_read_unlock(); 1007 } 1008 return ret; 1009 } 1010 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); 1011 1012 /** 1013 * ip6_tnl_xmit - encapsulate packet and send 1014 * @skb: the outgoing socket buffer 1015 * @dev: the outgoing tunnel device 1016 * @dsfield: dscp code for outer header 1017 * @fl6: flow of tunneled packet 1018 * @encap_limit: encapsulation limit 1019 * @pmtu: Path MTU is stored if packet is too big 1020 * @proto: next header value 1021 * 1022 * Description: 1023 * Build new header and do some sanity checks on the packet before sending 1024 * it. 1025 * 1026 * Return: 1027 * 0 on success 1028 * -1 fail 1029 * %-EMSGSIZE message too big. return mtu in this case. 1030 **/ 1031 1032 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 1033 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, 1034 __u8 proto) 1035 { 1036 struct ip6_tnl *t = netdev_priv(dev); 1037 struct net *net = t->net; 1038 struct net_device_stats *stats = &t->dev->stats; 1039 struct ipv6hdr *ipv6h; 1040 struct ipv6_tel_txoption opt; 1041 struct dst_entry *dst = NULL, *ndst = NULL; 1042 struct net_device *tdev; 1043 int mtu; 1044 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0; 1045 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; 1046 unsigned int max_headroom = psh_hlen; 1047 bool use_cache = false; 1048 u8 hop_limit; 1049 int err = -1; 1050 1051 if (t->parms.collect_md) { 1052 hop_limit = skb_tunnel_info(skb)->key.ttl; 1053 goto route_lookup; 1054 } else { 1055 hop_limit = t->parms.hop_limit; 1056 } 1057 1058 /* NBMA tunnel */ 1059 if (ipv6_addr_any(&t->parms.raddr)) { 1060 if (skb->protocol == htons(ETH_P_IPV6)) { 1061 struct in6_addr *addr6; 1062 struct neighbour *neigh; 1063 int addr_type; 1064 1065 if (!skb_dst(skb)) 1066 goto tx_err_link_failure; 1067 1068 neigh = dst_neigh_lookup(skb_dst(skb), 1069 &ipv6_hdr(skb)->daddr); 1070 if (!neigh) 1071 goto tx_err_link_failure; 1072 1073 addr6 = (struct in6_addr *)&neigh->primary_key; 1074 addr_type = ipv6_addr_type(addr6); 1075 1076 if (addr_type == IPV6_ADDR_ANY) 1077 addr6 = &ipv6_hdr(skb)->daddr; 1078 1079 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); 1080 neigh_release(neigh); 1081 } 1082 } else if (t->parms.proto != 0 && !(t->parms.flags & 1083 (IP6_TNL_F_USE_ORIG_TCLASS | 1084 IP6_TNL_F_USE_ORIG_FWMARK))) { 1085 /* enable the cache only if neither the outer protocol nor the 1086 * routing decision depends on the current inner header value 1087 */ 1088 use_cache = true; 1089 } 1090 1091 if (use_cache) 1092 dst = dst_cache_get(&t->dst_cache); 1093 1094 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) 1095 goto tx_err_link_failure; 1096 1097 if (!dst) { 1098 route_lookup: 1099 /* add dsfield to flowlabel for route lookup */ 1100 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel); 1101 1102 dst = ip6_route_output(net, NULL, fl6); 1103 1104 if (dst->error) 1105 goto tx_err_link_failure; 1106 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); 1107 if (IS_ERR(dst)) { 1108 err = PTR_ERR(dst); 1109 dst = NULL; 1110 goto tx_err_link_failure; 1111 } 1112 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) && 1113 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, 1114 &fl6->daddr, 0, &fl6->saddr)) 1115 goto tx_err_link_failure; 1116 ndst = dst; 1117 } 1118 1119 tdev = dst->dev; 1120 1121 if (tdev == dev) { 1122 stats->collisions++; 1123 net_warn_ratelimited("%s: Local routing loop detected!\n", 1124 t->parms.name); 1125 goto tx_err_dst_release; 1126 } 1127 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen; 1128 if (encap_limit >= 0) { 1129 max_headroom += 8; 1130 mtu -= 8; 1131 } 1132 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ? 1133 IPV6_MIN_MTU : IPV4_MIN_MTU); 1134 1135 skb_dst_update_pmtu(skb, mtu); 1136 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) { 1137 *pmtu = mtu; 1138 err = -EMSGSIZE; 1139 goto tx_err_dst_release; 1140 } 1141 1142 if (t->err_count > 0) { 1143 if (time_before(jiffies, 1144 t->err_time + IP6TUNNEL_ERR_TIMEO)) { 1145 t->err_count--; 1146 1147 dst_link_failure(skb); 1148 } else { 1149 t->err_count = 0; 1150 } 1151 } 1152 1153 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); 1154 1155 /* 1156 * Okay, now see if we can stuff it in the buffer as-is. 1157 */ 1158 max_headroom += LL_RESERVED_SPACE(tdev); 1159 1160 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1161 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1162 struct sk_buff *new_skb; 1163 1164 new_skb = skb_realloc_headroom(skb, max_headroom); 1165 if (!new_skb) 1166 goto tx_err_dst_release; 1167 1168 if (skb->sk) 1169 skb_set_owner_w(new_skb, skb->sk); 1170 consume_skb(skb); 1171 skb = new_skb; 1172 } 1173 1174 if (t->parms.collect_md) { 1175 if (t->encap.type != TUNNEL_ENCAP_NONE) 1176 goto tx_err_dst_release; 1177 } else { 1178 if (use_cache && ndst) 1179 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); 1180 } 1181 skb_dst_set(skb, dst); 1182 1183 if (hop_limit == 0) { 1184 if (skb->protocol == htons(ETH_P_IP)) 1185 hop_limit = ip_hdr(skb)->ttl; 1186 else if (skb->protocol == htons(ETH_P_IPV6)) 1187 hop_limit = ipv6_hdr(skb)->hop_limit; 1188 else 1189 hop_limit = ip6_dst_hoplimit(dst); 1190 } 1191 1192 /* Calculate max headroom for all the headers and adjust 1193 * needed_headroom if necessary. 1194 */ 1195 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) 1196 + dst->header_len + t->hlen; 1197 if (max_headroom > dev->needed_headroom) 1198 dev->needed_headroom = max_headroom; 1199 1200 err = ip6_tnl_encap(skb, t, &proto, fl6); 1201 if (err) 1202 return err; 1203 1204 if (encap_limit >= 0) { 1205 init_tel_txopt(&opt, encap_limit); 1206 ipv6_push_frag_opts(skb, &opt.ops, &proto); 1207 } 1208 1209 skb_push(skb, sizeof(struct ipv6hdr)); 1210 skb_reset_network_header(skb); 1211 ipv6h = ipv6_hdr(skb); 1212 ip6_flow_hdr(ipv6h, dsfield, 1213 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); 1214 ipv6h->hop_limit = hop_limit; 1215 ipv6h->nexthdr = proto; 1216 ipv6h->saddr = fl6->saddr; 1217 ipv6h->daddr = fl6->daddr; 1218 ip6tunnel_xmit(NULL, skb, dev); 1219 return 0; 1220 tx_err_link_failure: 1221 stats->tx_carrier_errors++; 1222 dst_link_failure(skb); 1223 tx_err_dst_release: 1224 dst_release(dst); 1225 return err; 1226 } 1227 EXPORT_SYMBOL(ip6_tnl_xmit); 1228 1229 static inline int 1230 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1231 { 1232 struct ip6_tnl *t = netdev_priv(dev); 1233 const struct iphdr *iph; 1234 int encap_limit = -1; 1235 struct flowi6 fl6; 1236 __u8 dsfield; 1237 __u32 mtu; 1238 u8 tproto; 1239 int err; 1240 1241 iph = ip_hdr(skb); 1242 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1243 1244 tproto = READ_ONCE(t->parms.proto); 1245 if (tproto != IPPROTO_IPIP && tproto != 0) 1246 return -1; 1247 1248 if (t->parms.collect_md) { 1249 struct ip_tunnel_info *tun_info; 1250 const struct ip_tunnel_key *key; 1251 1252 tun_info = skb_tunnel_info(skb); 1253 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1254 ip_tunnel_info_af(tun_info) != AF_INET6)) 1255 return -1; 1256 key = &tun_info->key; 1257 memset(&fl6, 0, sizeof(fl6)); 1258 fl6.flowi6_proto = IPPROTO_IPIP; 1259 fl6.saddr = key->u.ipv6.src; 1260 fl6.daddr = key->u.ipv6.dst; 1261 fl6.flowlabel = key->label; 1262 dsfield = key->tos; 1263 } else { 1264 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1265 encap_limit = t->parms.encap_limit; 1266 1267 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1268 fl6.flowi6_proto = IPPROTO_IPIP; 1269 1270 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1271 dsfield = ipv4_get_dsfield(iph); 1272 else 1273 dsfield = ip6_tclass(t->parms.flowinfo); 1274 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1275 fl6.flowi6_mark = skb->mark; 1276 else 1277 fl6.flowi6_mark = t->parms.fwmark; 1278 } 1279 1280 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1281 1282 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1283 return -1; 1284 1285 dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph)); 1286 1287 skb_set_inner_ipproto(skb, IPPROTO_IPIP); 1288 1289 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1290 IPPROTO_IPIP); 1291 if (err != 0) { 1292 /* XXX: send ICMP error even if DF is not set. */ 1293 if (err == -EMSGSIZE) 1294 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 1295 htonl(mtu)); 1296 return -1; 1297 } 1298 1299 return 0; 1300 } 1301 1302 static inline int 1303 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1304 { 1305 struct ip6_tnl *t = netdev_priv(dev); 1306 struct ipv6hdr *ipv6h; 1307 int encap_limit = -1; 1308 __u16 offset; 1309 struct flowi6 fl6; 1310 __u8 dsfield; 1311 __u32 mtu; 1312 u8 tproto; 1313 int err; 1314 1315 ipv6h = ipv6_hdr(skb); 1316 tproto = READ_ONCE(t->parms.proto); 1317 if ((tproto != IPPROTO_IPV6 && tproto != 0) || 1318 ip6_tnl_addr_conflict(t, ipv6h)) 1319 return -1; 1320 1321 if (t->parms.collect_md) { 1322 struct ip_tunnel_info *tun_info; 1323 const struct ip_tunnel_key *key; 1324 1325 tun_info = skb_tunnel_info(skb); 1326 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1327 ip_tunnel_info_af(tun_info) != AF_INET6)) 1328 return -1; 1329 key = &tun_info->key; 1330 memset(&fl6, 0, sizeof(fl6)); 1331 fl6.flowi6_proto = IPPROTO_IPV6; 1332 fl6.saddr = key->u.ipv6.src; 1333 fl6.daddr = key->u.ipv6.dst; 1334 fl6.flowlabel = key->label; 1335 dsfield = key->tos; 1336 } else { 1337 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 1338 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 1339 ipv6h = ipv6_hdr(skb); 1340 if (offset > 0) { 1341 struct ipv6_tlv_tnl_enc_lim *tel; 1342 1343 tel = (void *)&skb_network_header(skb)[offset]; 1344 if (tel->encap_limit == 0) { 1345 icmpv6_send(skb, ICMPV6_PARAMPROB, 1346 ICMPV6_HDR_FIELD, offset + 2); 1347 return -1; 1348 } 1349 encap_limit = tel->encap_limit - 1; 1350 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 1351 encap_limit = t->parms.encap_limit; 1352 } 1353 1354 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1355 fl6.flowi6_proto = IPPROTO_IPV6; 1356 1357 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1358 dsfield = ipv6_get_dsfield(ipv6h); 1359 else 1360 dsfield = ip6_tclass(t->parms.flowinfo); 1361 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 1362 fl6.flowlabel |= ip6_flowlabel(ipv6h); 1363 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1364 fl6.flowi6_mark = skb->mark; 1365 else 1366 fl6.flowi6_mark = t->parms.fwmark; 1367 } 1368 1369 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1370 1371 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1372 return -1; 1373 1374 dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h)); 1375 1376 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1377 1378 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1379 IPPROTO_IPV6); 1380 if (err != 0) { 1381 if (err == -EMSGSIZE) 1382 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1383 return -1; 1384 } 1385 1386 return 0; 1387 } 1388 1389 static netdev_tx_t 1390 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) 1391 { 1392 struct ip6_tnl *t = netdev_priv(dev); 1393 struct net_device_stats *stats = &t->dev->stats; 1394 int ret; 1395 1396 if (!pskb_inet_may_pull(skb)) 1397 goto tx_err; 1398 1399 switch (skb->protocol) { 1400 case htons(ETH_P_IP): 1401 ret = ip4ip6_tnl_xmit(skb, dev); 1402 break; 1403 case htons(ETH_P_IPV6): 1404 ret = ip6ip6_tnl_xmit(skb, dev); 1405 break; 1406 default: 1407 goto tx_err; 1408 } 1409 1410 if (ret < 0) 1411 goto tx_err; 1412 1413 return NETDEV_TX_OK; 1414 1415 tx_err: 1416 stats->tx_errors++; 1417 stats->tx_dropped++; 1418 kfree_skb(skb); 1419 return NETDEV_TX_OK; 1420 } 1421 1422 static void ip6_tnl_link_config(struct ip6_tnl *t) 1423 { 1424 struct net_device *dev = t->dev; 1425 struct __ip6_tnl_parm *p = &t->parms; 1426 struct flowi6 *fl6 = &t->fl.u.ip6; 1427 int t_hlen; 1428 1429 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1430 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1431 1432 /* Set up flowi template */ 1433 fl6->saddr = p->laddr; 1434 fl6->daddr = p->raddr; 1435 fl6->flowi6_oif = p->link; 1436 fl6->flowlabel = 0; 1437 1438 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1439 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1440 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1441 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1442 1443 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1444 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1445 1446 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) 1447 dev->flags |= IFF_POINTOPOINT; 1448 else 1449 dev->flags &= ~IFF_POINTOPOINT; 1450 1451 t->tun_hlen = 0; 1452 t->hlen = t->encap_hlen + t->tun_hlen; 1453 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1454 1455 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1456 int strict = (ipv6_addr_type(&p->raddr) & 1457 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1458 1459 struct rt6_info *rt = rt6_lookup(t->net, 1460 &p->raddr, &p->laddr, 1461 p->link, NULL, strict); 1462 1463 if (!rt) 1464 return; 1465 1466 if (rt->dst.dev) { 1467 dev->hard_header_len = rt->dst.dev->hard_header_len + 1468 t_hlen; 1469 1470 dev->mtu = rt->dst.dev->mtu - t_hlen; 1471 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1472 dev->mtu -= 8; 1473 1474 if (dev->mtu < IPV6_MIN_MTU) 1475 dev->mtu = IPV6_MIN_MTU; 1476 } 1477 ip6_rt_put(rt); 1478 } 1479 } 1480 1481 /** 1482 * ip6_tnl_change - update the tunnel parameters 1483 * @t: tunnel to be changed 1484 * @p: tunnel configuration parameters 1485 * 1486 * Description: 1487 * ip6_tnl_change() updates the tunnel parameters 1488 **/ 1489 1490 static int 1491 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) 1492 { 1493 t->parms.laddr = p->laddr; 1494 t->parms.raddr = p->raddr; 1495 t->parms.flags = p->flags; 1496 t->parms.hop_limit = p->hop_limit; 1497 t->parms.encap_limit = p->encap_limit; 1498 t->parms.flowinfo = p->flowinfo; 1499 t->parms.link = p->link; 1500 t->parms.proto = p->proto; 1501 t->parms.fwmark = p->fwmark; 1502 dst_cache_reset(&t->dst_cache); 1503 ip6_tnl_link_config(t); 1504 return 0; 1505 } 1506 1507 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1508 { 1509 struct net *net = t->net; 1510 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1511 int err; 1512 1513 ip6_tnl_unlink(ip6n, t); 1514 synchronize_net(); 1515 err = ip6_tnl_change(t, p); 1516 ip6_tnl_link(ip6n, t); 1517 netdev_state_change(t->dev); 1518 return err; 1519 } 1520 1521 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1522 { 1523 /* for default tnl0 device allow to change only the proto */ 1524 t->parms.proto = p->proto; 1525 netdev_state_change(t->dev); 1526 return 0; 1527 } 1528 1529 static void 1530 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) 1531 { 1532 p->laddr = u->laddr; 1533 p->raddr = u->raddr; 1534 p->flags = u->flags; 1535 p->hop_limit = u->hop_limit; 1536 p->encap_limit = u->encap_limit; 1537 p->flowinfo = u->flowinfo; 1538 p->link = u->link; 1539 p->proto = u->proto; 1540 memcpy(p->name, u->name, sizeof(u->name)); 1541 } 1542 1543 static void 1544 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) 1545 { 1546 u->laddr = p->laddr; 1547 u->raddr = p->raddr; 1548 u->flags = p->flags; 1549 u->hop_limit = p->hop_limit; 1550 u->encap_limit = p->encap_limit; 1551 u->flowinfo = p->flowinfo; 1552 u->link = p->link; 1553 u->proto = p->proto; 1554 memcpy(u->name, p->name, sizeof(u->name)); 1555 } 1556 1557 /** 1558 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace 1559 * @dev: virtual device associated with tunnel 1560 * @ifr: parameters passed from userspace 1561 * @cmd: command to be performed 1562 * 1563 * Description: 1564 * ip6_tnl_ioctl() is used for managing IPv6 tunnels 1565 * from userspace. 1566 * 1567 * The possible commands are the following: 1568 * %SIOCGETTUNNEL: get tunnel parameters for device 1569 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 1570 * %SIOCCHGTUNNEL: change tunnel parameters to those given 1571 * %SIOCDELTUNNEL: delete tunnel 1572 * 1573 * The fallback device "ip6tnl0", created during module 1574 * initialization, can be used for creating other tunnel devices. 1575 * 1576 * Return: 1577 * 0 on success, 1578 * %-EFAULT if unable to copy data to or from userspace, 1579 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 1580 * %-EINVAL if passed tunnel parameters are invalid, 1581 * %-EEXIST if changing a tunnel's parameters would cause a conflict 1582 * %-ENODEV if attempting to change or delete a nonexisting device 1583 **/ 1584 1585 static int 1586 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1587 { 1588 int err = 0; 1589 struct ip6_tnl_parm p; 1590 struct __ip6_tnl_parm p1; 1591 struct ip6_tnl *t = netdev_priv(dev); 1592 struct net *net = t->net; 1593 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1594 1595 memset(&p1, 0, sizeof(p1)); 1596 1597 switch (cmd) { 1598 case SIOCGETTUNNEL: 1599 if (dev == ip6n->fb_tnl_dev) { 1600 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1601 err = -EFAULT; 1602 break; 1603 } 1604 ip6_tnl_parm_from_user(&p1, &p); 1605 t = ip6_tnl_locate(net, &p1, 0); 1606 if (IS_ERR(t)) 1607 t = netdev_priv(dev); 1608 } else { 1609 memset(&p, 0, sizeof(p)); 1610 } 1611 ip6_tnl_parm_to_user(&p, &t->parms); 1612 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { 1613 err = -EFAULT; 1614 } 1615 break; 1616 case SIOCADDTUNNEL: 1617 case SIOCCHGTUNNEL: 1618 err = -EPERM; 1619 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1620 break; 1621 err = -EFAULT; 1622 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1623 break; 1624 err = -EINVAL; 1625 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 1626 p.proto != 0) 1627 break; 1628 ip6_tnl_parm_from_user(&p1, &p); 1629 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); 1630 if (cmd == SIOCCHGTUNNEL) { 1631 if (!IS_ERR(t)) { 1632 if (t->dev != dev) { 1633 err = -EEXIST; 1634 break; 1635 } 1636 } else 1637 t = netdev_priv(dev); 1638 if (dev == ip6n->fb_tnl_dev) 1639 err = ip6_tnl0_update(t, &p1); 1640 else 1641 err = ip6_tnl_update(t, &p1); 1642 } 1643 if (!IS_ERR(t)) { 1644 err = 0; 1645 ip6_tnl_parm_to_user(&p, &t->parms); 1646 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1647 err = -EFAULT; 1648 1649 } else { 1650 err = PTR_ERR(t); 1651 } 1652 break; 1653 case SIOCDELTUNNEL: 1654 err = -EPERM; 1655 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1656 break; 1657 1658 if (dev == ip6n->fb_tnl_dev) { 1659 err = -EFAULT; 1660 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1661 break; 1662 err = -ENOENT; 1663 ip6_tnl_parm_from_user(&p1, &p); 1664 t = ip6_tnl_locate(net, &p1, 0); 1665 if (IS_ERR(t)) 1666 break; 1667 err = -EPERM; 1668 if (t->dev == ip6n->fb_tnl_dev) 1669 break; 1670 dev = t->dev; 1671 } 1672 err = 0; 1673 unregister_netdevice(dev); 1674 break; 1675 default: 1676 err = -EINVAL; 1677 } 1678 return err; 1679 } 1680 1681 /** 1682 * ip6_tnl_change_mtu - change mtu manually for tunnel device 1683 * @dev: virtual device associated with tunnel 1684 * @new_mtu: the new mtu 1685 * 1686 * Return: 1687 * 0 on success, 1688 * %-EINVAL if mtu too small 1689 **/ 1690 1691 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) 1692 { 1693 struct ip6_tnl *tnl = netdev_priv(dev); 1694 1695 if (tnl->parms.proto == IPPROTO_IPV6) { 1696 if (new_mtu < IPV6_MIN_MTU) 1697 return -EINVAL; 1698 } else { 1699 if (new_mtu < ETH_MIN_MTU) 1700 return -EINVAL; 1701 } 1702 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) { 1703 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len) 1704 return -EINVAL; 1705 } else { 1706 if (new_mtu > IP_MAX_MTU - dev->hard_header_len) 1707 return -EINVAL; 1708 } 1709 dev->mtu = new_mtu; 1710 return 0; 1711 } 1712 EXPORT_SYMBOL(ip6_tnl_change_mtu); 1713 1714 int ip6_tnl_get_iflink(const struct net_device *dev) 1715 { 1716 struct ip6_tnl *t = netdev_priv(dev); 1717 1718 return t->parms.link; 1719 } 1720 EXPORT_SYMBOL(ip6_tnl_get_iflink); 1721 1722 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 1723 unsigned int num) 1724 { 1725 if (num >= MAX_IPTUN_ENCAP_OPS) 1726 return -ERANGE; 1727 1728 return !cmpxchg((const struct ip6_tnl_encap_ops **) 1729 &ip6tun_encaps[num], 1730 NULL, ops) ? 0 : -1; 1731 } 1732 EXPORT_SYMBOL(ip6_tnl_encap_add_ops); 1733 1734 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 1735 unsigned int num) 1736 { 1737 int ret; 1738 1739 if (num >= MAX_IPTUN_ENCAP_OPS) 1740 return -ERANGE; 1741 1742 ret = (cmpxchg((const struct ip6_tnl_encap_ops **) 1743 &ip6tun_encaps[num], 1744 ops, NULL) == ops) ? 0 : -1; 1745 1746 synchronize_net(); 1747 1748 return ret; 1749 } 1750 EXPORT_SYMBOL(ip6_tnl_encap_del_ops); 1751 1752 int ip6_tnl_encap_setup(struct ip6_tnl *t, 1753 struct ip_tunnel_encap *ipencap) 1754 { 1755 int hlen; 1756 1757 memset(&t->encap, 0, sizeof(t->encap)); 1758 1759 hlen = ip6_encap_hlen(ipencap); 1760 if (hlen < 0) 1761 return hlen; 1762 1763 t->encap.type = ipencap->type; 1764 t->encap.sport = ipencap->sport; 1765 t->encap.dport = ipencap->dport; 1766 t->encap.flags = ipencap->flags; 1767 1768 t->encap_hlen = hlen; 1769 t->hlen = t->encap_hlen + t->tun_hlen; 1770 1771 return 0; 1772 } 1773 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); 1774 1775 static const struct net_device_ops ip6_tnl_netdev_ops = { 1776 .ndo_init = ip6_tnl_dev_init, 1777 .ndo_uninit = ip6_tnl_dev_uninit, 1778 .ndo_start_xmit = ip6_tnl_start_xmit, 1779 .ndo_do_ioctl = ip6_tnl_ioctl, 1780 .ndo_change_mtu = ip6_tnl_change_mtu, 1781 .ndo_get_stats = ip6_get_stats, 1782 .ndo_get_iflink = ip6_tnl_get_iflink, 1783 }; 1784 1785 #define IPXIPX_FEATURES (NETIF_F_SG | \ 1786 NETIF_F_FRAGLIST | \ 1787 NETIF_F_HIGHDMA | \ 1788 NETIF_F_GSO_SOFTWARE | \ 1789 NETIF_F_HW_CSUM) 1790 1791 /** 1792 * ip6_tnl_dev_setup - setup virtual tunnel device 1793 * @dev: virtual device associated with tunnel 1794 * 1795 * Description: 1796 * Initialize function pointers and device parameters 1797 **/ 1798 1799 static void ip6_tnl_dev_setup(struct net_device *dev) 1800 { 1801 dev->netdev_ops = &ip6_tnl_netdev_ops; 1802 dev->needs_free_netdev = true; 1803 dev->priv_destructor = ip6_dev_free; 1804 1805 dev->type = ARPHRD_TUNNEL6; 1806 dev->flags |= IFF_NOARP; 1807 dev->addr_len = sizeof(struct in6_addr); 1808 dev->features |= NETIF_F_LLTX; 1809 netif_keep_dst(dev); 1810 1811 dev->features |= IPXIPX_FEATURES; 1812 dev->hw_features |= IPXIPX_FEATURES; 1813 1814 /* This perm addr will be used as interface identifier by IPv6 */ 1815 dev->addr_assign_type = NET_ADDR_RANDOM; 1816 eth_random_addr(dev->perm_addr); 1817 } 1818 1819 1820 /** 1821 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices 1822 * @dev: virtual device associated with tunnel 1823 **/ 1824 1825 static inline int 1826 ip6_tnl_dev_init_gen(struct net_device *dev) 1827 { 1828 struct ip6_tnl *t = netdev_priv(dev); 1829 int ret; 1830 int t_hlen; 1831 1832 t->dev = dev; 1833 t->net = dev_net(dev); 1834 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1835 if (!dev->tstats) 1836 return -ENOMEM; 1837 1838 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); 1839 if (ret) 1840 goto free_stats; 1841 1842 ret = gro_cells_init(&t->gro_cells, dev); 1843 if (ret) 1844 goto destroy_dst; 1845 1846 t->tun_hlen = 0; 1847 t->hlen = t->encap_hlen + t->tun_hlen; 1848 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1849 1850 dev->type = ARPHRD_TUNNEL6; 1851 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1852 dev->mtu = ETH_DATA_LEN - t_hlen; 1853 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1854 dev->mtu -= 8; 1855 dev->min_mtu = ETH_MIN_MTU; 1856 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len; 1857 1858 return 0; 1859 1860 destroy_dst: 1861 dst_cache_destroy(&t->dst_cache); 1862 free_stats: 1863 free_percpu(dev->tstats); 1864 dev->tstats = NULL; 1865 1866 return ret; 1867 } 1868 1869 /** 1870 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices 1871 * @dev: virtual device associated with tunnel 1872 **/ 1873 1874 static int ip6_tnl_dev_init(struct net_device *dev) 1875 { 1876 struct ip6_tnl *t = netdev_priv(dev); 1877 int err = ip6_tnl_dev_init_gen(dev); 1878 1879 if (err) 1880 return err; 1881 ip6_tnl_link_config(t); 1882 if (t->parms.collect_md) { 1883 dev->features |= NETIF_F_NETNS_LOCAL; 1884 netif_keep_dst(dev); 1885 } 1886 return 0; 1887 } 1888 1889 /** 1890 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device 1891 * @dev: fallback device 1892 * 1893 * Return: 0 1894 **/ 1895 1896 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) 1897 { 1898 struct ip6_tnl *t = netdev_priv(dev); 1899 struct net *net = dev_net(dev); 1900 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1901 1902 t->parms.proto = IPPROTO_IPV6; 1903 dev_hold(dev); 1904 1905 rcu_assign_pointer(ip6n->tnls_wc[0], t); 1906 return 0; 1907 } 1908 1909 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[], 1910 struct netlink_ext_ack *extack) 1911 { 1912 u8 proto; 1913 1914 if (!data || !data[IFLA_IPTUN_PROTO]) 1915 return 0; 1916 1917 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1918 if (proto != IPPROTO_IPV6 && 1919 proto != IPPROTO_IPIP && 1920 proto != 0) 1921 return -EINVAL; 1922 1923 return 0; 1924 } 1925 1926 static void ip6_tnl_netlink_parms(struct nlattr *data[], 1927 struct __ip6_tnl_parm *parms) 1928 { 1929 memset(parms, 0, sizeof(*parms)); 1930 1931 if (!data) 1932 return; 1933 1934 if (data[IFLA_IPTUN_LINK]) 1935 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1936 1937 if (data[IFLA_IPTUN_LOCAL]) 1938 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); 1939 1940 if (data[IFLA_IPTUN_REMOTE]) 1941 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); 1942 1943 if (data[IFLA_IPTUN_TTL]) 1944 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); 1945 1946 if (data[IFLA_IPTUN_ENCAP_LIMIT]) 1947 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); 1948 1949 if (data[IFLA_IPTUN_FLOWINFO]) 1950 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); 1951 1952 if (data[IFLA_IPTUN_FLAGS]) 1953 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); 1954 1955 if (data[IFLA_IPTUN_PROTO]) 1956 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1957 1958 if (data[IFLA_IPTUN_COLLECT_METADATA]) 1959 parms->collect_md = true; 1960 1961 if (data[IFLA_IPTUN_FWMARK]) 1962 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1963 } 1964 1965 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], 1966 struct ip_tunnel_encap *ipencap) 1967 { 1968 bool ret = false; 1969 1970 memset(ipencap, 0, sizeof(*ipencap)); 1971 1972 if (!data) 1973 return ret; 1974 1975 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1976 ret = true; 1977 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1978 } 1979 1980 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1981 ret = true; 1982 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1983 } 1984 1985 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1986 ret = true; 1987 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1988 } 1989 1990 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1991 ret = true; 1992 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1993 } 1994 1995 return ret; 1996 } 1997 1998 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, 1999 struct nlattr *tb[], struct nlattr *data[], 2000 struct netlink_ext_ack *extack) 2001 { 2002 struct net *net = dev_net(dev); 2003 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2004 struct ip_tunnel_encap ipencap; 2005 struct ip6_tnl *nt, *t; 2006 int err; 2007 2008 nt = netdev_priv(dev); 2009 2010 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 2011 err = ip6_tnl_encap_setup(nt, &ipencap); 2012 if (err < 0) 2013 return err; 2014 } 2015 2016 ip6_tnl_netlink_parms(data, &nt->parms); 2017 2018 if (nt->parms.collect_md) { 2019 if (rtnl_dereference(ip6n->collect_md_tun)) 2020 return -EEXIST; 2021 } else { 2022 t = ip6_tnl_locate(net, &nt->parms, 0); 2023 if (!IS_ERR(t)) 2024 return -EEXIST; 2025 } 2026 2027 err = ip6_tnl_create2(dev); 2028 if (!err && tb[IFLA_MTU]) 2029 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 2030 2031 return err; 2032 } 2033 2034 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], 2035 struct nlattr *data[], 2036 struct netlink_ext_ack *extack) 2037 { 2038 struct ip6_tnl *t = netdev_priv(dev); 2039 struct __ip6_tnl_parm p; 2040 struct net *net = t->net; 2041 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2042 struct ip_tunnel_encap ipencap; 2043 2044 if (dev == ip6n->fb_tnl_dev) 2045 return -EINVAL; 2046 2047 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 2048 int err = ip6_tnl_encap_setup(t, &ipencap); 2049 2050 if (err < 0) 2051 return err; 2052 } 2053 ip6_tnl_netlink_parms(data, &p); 2054 if (p.collect_md) 2055 return -EINVAL; 2056 2057 t = ip6_tnl_locate(net, &p, 0); 2058 if (!IS_ERR(t)) { 2059 if (t->dev != dev) 2060 return -EEXIST; 2061 } else 2062 t = netdev_priv(dev); 2063 2064 return ip6_tnl_update(t, &p); 2065 } 2066 2067 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) 2068 { 2069 struct net *net = dev_net(dev); 2070 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2071 2072 if (dev != ip6n->fb_tnl_dev) 2073 unregister_netdevice_queue(dev, head); 2074 } 2075 2076 static size_t ip6_tnl_get_size(const struct net_device *dev) 2077 { 2078 return 2079 /* IFLA_IPTUN_LINK */ 2080 nla_total_size(4) + 2081 /* IFLA_IPTUN_LOCAL */ 2082 nla_total_size(sizeof(struct in6_addr)) + 2083 /* IFLA_IPTUN_REMOTE */ 2084 nla_total_size(sizeof(struct in6_addr)) + 2085 /* IFLA_IPTUN_TTL */ 2086 nla_total_size(1) + 2087 /* IFLA_IPTUN_ENCAP_LIMIT */ 2088 nla_total_size(1) + 2089 /* IFLA_IPTUN_FLOWINFO */ 2090 nla_total_size(4) + 2091 /* IFLA_IPTUN_FLAGS */ 2092 nla_total_size(4) + 2093 /* IFLA_IPTUN_PROTO */ 2094 nla_total_size(1) + 2095 /* IFLA_IPTUN_ENCAP_TYPE */ 2096 nla_total_size(2) + 2097 /* IFLA_IPTUN_ENCAP_FLAGS */ 2098 nla_total_size(2) + 2099 /* IFLA_IPTUN_ENCAP_SPORT */ 2100 nla_total_size(2) + 2101 /* IFLA_IPTUN_ENCAP_DPORT */ 2102 nla_total_size(2) + 2103 /* IFLA_IPTUN_COLLECT_METADATA */ 2104 nla_total_size(0) + 2105 /* IFLA_IPTUN_FWMARK */ 2106 nla_total_size(4) + 2107 0; 2108 } 2109 2110 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) 2111 { 2112 struct ip6_tnl *tunnel = netdev_priv(dev); 2113 struct __ip6_tnl_parm *parm = &tunnel->parms; 2114 2115 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 2116 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || 2117 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || 2118 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || 2119 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || 2120 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || 2121 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || 2122 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) || 2123 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark)) 2124 goto nla_put_failure; 2125 2126 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || 2127 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) || 2128 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || 2129 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) 2130 goto nla_put_failure; 2131 2132 if (parm->collect_md) 2133 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) 2134 goto nla_put_failure; 2135 2136 return 0; 2137 2138 nla_put_failure: 2139 return -EMSGSIZE; 2140 } 2141 2142 struct net *ip6_tnl_get_link_net(const struct net_device *dev) 2143 { 2144 struct ip6_tnl *tunnel = netdev_priv(dev); 2145 2146 return tunnel->net; 2147 } 2148 EXPORT_SYMBOL(ip6_tnl_get_link_net); 2149 2150 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { 2151 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 2152 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, 2153 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, 2154 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 2155 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, 2156 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, 2157 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, 2158 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 2159 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 2160 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 2161 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 2162 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 2163 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, 2164 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 2165 }; 2166 2167 static struct rtnl_link_ops ip6_link_ops __read_mostly = { 2168 .kind = "ip6tnl", 2169 .maxtype = IFLA_IPTUN_MAX, 2170 .policy = ip6_tnl_policy, 2171 .priv_size = sizeof(struct ip6_tnl), 2172 .setup = ip6_tnl_dev_setup, 2173 .validate = ip6_tnl_validate, 2174 .newlink = ip6_tnl_newlink, 2175 .changelink = ip6_tnl_changelink, 2176 .dellink = ip6_tnl_dellink, 2177 .get_size = ip6_tnl_get_size, 2178 .fill_info = ip6_tnl_fill_info, 2179 .get_link_net = ip6_tnl_get_link_net, 2180 }; 2181 2182 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { 2183 .handler = ip4ip6_rcv, 2184 .err_handler = ip4ip6_err, 2185 .priority = 1, 2186 }; 2187 2188 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { 2189 .handler = ip6ip6_rcv, 2190 .err_handler = ip6ip6_err, 2191 .priority = 1, 2192 }; 2193 2194 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list) 2195 { 2196 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2197 struct net_device *dev, *aux; 2198 int h; 2199 struct ip6_tnl *t; 2200 2201 for_each_netdev_safe(net, dev, aux) 2202 if (dev->rtnl_link_ops == &ip6_link_ops) 2203 unregister_netdevice_queue(dev, list); 2204 2205 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) { 2206 t = rtnl_dereference(ip6n->tnls_r_l[h]); 2207 while (t) { 2208 /* If dev is in the same netns, it has already 2209 * been added to the list by the previous loop. 2210 */ 2211 if (!net_eq(dev_net(t->dev), net)) 2212 unregister_netdevice_queue(t->dev, list); 2213 t = rtnl_dereference(t->next); 2214 } 2215 } 2216 } 2217 2218 static int __net_init ip6_tnl_init_net(struct net *net) 2219 { 2220 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2221 struct ip6_tnl *t = NULL; 2222 int err; 2223 2224 ip6n->tnls[0] = ip6n->tnls_wc; 2225 ip6n->tnls[1] = ip6n->tnls_r_l; 2226 2227 if (!net_has_fallback_tunnels(net)) 2228 return 0; 2229 err = -ENOMEM; 2230 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", 2231 NET_NAME_UNKNOWN, ip6_tnl_dev_setup); 2232 2233 if (!ip6n->fb_tnl_dev) 2234 goto err_alloc_dev; 2235 dev_net_set(ip6n->fb_tnl_dev, net); 2236 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; 2237 /* FB netdevice is special: we have one, and only one per netns. 2238 * Allowing to move it to another netns is clearly unsafe. 2239 */ 2240 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; 2241 2242 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); 2243 if (err < 0) 2244 goto err_register; 2245 2246 err = register_netdev(ip6n->fb_tnl_dev); 2247 if (err < 0) 2248 goto err_register; 2249 2250 t = netdev_priv(ip6n->fb_tnl_dev); 2251 2252 strcpy(t->parms.name, ip6n->fb_tnl_dev->name); 2253 return 0; 2254 2255 err_register: 2256 free_netdev(ip6n->fb_tnl_dev); 2257 err_alloc_dev: 2258 return err; 2259 } 2260 2261 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list) 2262 { 2263 struct net *net; 2264 LIST_HEAD(list); 2265 2266 rtnl_lock(); 2267 list_for_each_entry(net, net_list, exit_list) 2268 ip6_tnl_destroy_tunnels(net, &list); 2269 unregister_netdevice_many(&list); 2270 rtnl_unlock(); 2271 } 2272 2273 static struct pernet_operations ip6_tnl_net_ops = { 2274 .init = ip6_tnl_init_net, 2275 .exit_batch = ip6_tnl_exit_batch_net, 2276 .id = &ip6_tnl_net_id, 2277 .size = sizeof(struct ip6_tnl_net), 2278 }; 2279 2280 /** 2281 * ip6_tunnel_init - register protocol and reserve needed resources 2282 * 2283 * Return: 0 on success 2284 **/ 2285 2286 static int __init ip6_tunnel_init(void) 2287 { 2288 int err; 2289 2290 if (!ipv6_mod_enabled()) 2291 return -EOPNOTSUPP; 2292 2293 err = register_pernet_device(&ip6_tnl_net_ops); 2294 if (err < 0) 2295 goto out_pernet; 2296 2297 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); 2298 if (err < 0) { 2299 pr_err("%s: can't register ip4ip6\n", __func__); 2300 goto out_ip4ip6; 2301 } 2302 2303 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); 2304 if (err < 0) { 2305 pr_err("%s: can't register ip6ip6\n", __func__); 2306 goto out_ip6ip6; 2307 } 2308 err = rtnl_link_register(&ip6_link_ops); 2309 if (err < 0) 2310 goto rtnl_link_failed; 2311 2312 return 0; 2313 2314 rtnl_link_failed: 2315 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); 2316 out_ip6ip6: 2317 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); 2318 out_ip4ip6: 2319 unregister_pernet_device(&ip6_tnl_net_ops); 2320 out_pernet: 2321 return err; 2322 } 2323 2324 /** 2325 * ip6_tunnel_cleanup - free resources and unregister protocol 2326 **/ 2327 2328 static void __exit ip6_tunnel_cleanup(void) 2329 { 2330 rtnl_link_unregister(&ip6_link_ops); 2331 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) 2332 pr_info("%s: can't deregister ip4ip6\n", __func__); 2333 2334 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) 2335 pr_info("%s: can't deregister ip6ip6\n", __func__); 2336 2337 unregister_pernet_device(&ip6_tnl_net_ops); 2338 } 2339 2340 module_init(ip6_tunnel_init); 2341 module_exit(ip6_tunnel_cleanup); 2342