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 = -E2BIG; 301 302 if (p->name[0]) { 303 if (!dev_valid_name(p->name)) 304 goto failed; 305 strlcpy(name, p->name, IFNAMSIZ); 306 } else { 307 sprintf(name, "ip6tnl%%d"); 308 } 309 err = -ENOMEM; 310 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 311 ip6_tnl_dev_setup); 312 if (!dev) 313 goto failed; 314 315 dev_net_set(dev, net); 316 317 t = netdev_priv(dev); 318 t->parms = *p; 319 t->net = dev_net(dev); 320 err = ip6_tnl_create2(dev); 321 if (err < 0) 322 goto failed_free; 323 324 return t; 325 326 failed_free: 327 free_netdev(dev); 328 failed: 329 return ERR_PTR(err); 330 } 331 332 /** 333 * ip6_tnl_locate - find or create tunnel matching given parameters 334 * @p: tunnel parameters 335 * @create: != 0 if allowed to create new tunnel if no match found 336 * 337 * Description: 338 * ip6_tnl_locate() first tries to locate an existing tunnel 339 * based on @parms. If this is unsuccessful, but @create is set a new 340 * tunnel device is created and registered for use. 341 * 342 * Return: 343 * matching tunnel or error pointer 344 **/ 345 346 static struct ip6_tnl *ip6_tnl_locate(struct net *net, 347 struct __ip6_tnl_parm *p, int create) 348 { 349 const struct in6_addr *remote = &p->raddr; 350 const struct in6_addr *local = &p->laddr; 351 struct ip6_tnl __rcu **tp; 352 struct ip6_tnl *t; 353 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 354 355 for (tp = ip6_tnl_bucket(ip6n, p); 356 (t = rtnl_dereference(*tp)) != NULL; 357 tp = &t->next) { 358 if (ipv6_addr_equal(local, &t->parms.laddr) && 359 ipv6_addr_equal(remote, &t->parms.raddr)) { 360 if (create) 361 return ERR_PTR(-EEXIST); 362 363 return t; 364 } 365 } 366 if (!create) 367 return ERR_PTR(-ENODEV); 368 return ip6_tnl_create(net, p); 369 } 370 371 /** 372 * ip6_tnl_dev_uninit - tunnel device uninitializer 373 * @dev: the device to be destroyed 374 * 375 * Description: 376 * ip6_tnl_dev_uninit() removes tunnel from its list 377 **/ 378 379 static void 380 ip6_tnl_dev_uninit(struct net_device *dev) 381 { 382 struct ip6_tnl *t = netdev_priv(dev); 383 struct net *net = t->net; 384 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 385 386 if (dev == ip6n->fb_tnl_dev) 387 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); 388 else 389 ip6_tnl_unlink(ip6n, t); 390 dst_cache_reset(&t->dst_cache); 391 dev_put(dev); 392 } 393 394 /** 395 * parse_tvl_tnl_enc_lim - handle encapsulation limit option 396 * @skb: received socket buffer 397 * 398 * Return: 399 * 0 if none was found, 400 * else index to encapsulation limit 401 **/ 402 403 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) 404 { 405 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw; 406 unsigned int nhoff = raw - skb->data; 407 unsigned int off = nhoff + sizeof(*ipv6h); 408 u8 next, nexthdr = ipv6h->nexthdr; 409 410 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { 411 struct ipv6_opt_hdr *hdr; 412 u16 optlen; 413 414 if (!pskb_may_pull(skb, off + sizeof(*hdr))) 415 break; 416 417 hdr = (struct ipv6_opt_hdr *)(skb->data + off); 418 if (nexthdr == NEXTHDR_FRAGMENT) { 419 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; 420 if (frag_hdr->frag_off) 421 break; 422 optlen = 8; 423 } else if (nexthdr == NEXTHDR_AUTH) { 424 optlen = (hdr->hdrlen + 2) << 2; 425 } else { 426 optlen = ipv6_optlen(hdr); 427 } 428 /* cache hdr->nexthdr, since pskb_may_pull() might 429 * invalidate hdr 430 */ 431 next = hdr->nexthdr; 432 if (nexthdr == NEXTHDR_DEST) { 433 u16 i = 2; 434 435 /* Remember : hdr is no longer valid at this point. */ 436 if (!pskb_may_pull(skb, off + optlen)) 437 break; 438 439 while (1) { 440 struct ipv6_tlv_tnl_enc_lim *tel; 441 442 /* No more room for encapsulation limit */ 443 if (i + sizeof(*tel) > optlen) 444 break; 445 446 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i); 447 /* return index of option if found and valid */ 448 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && 449 tel->length == 1) 450 return i + off - nhoff; 451 /* else jump to next option */ 452 if (tel->type) 453 i += tel->length + 2; 454 else 455 i++; 456 } 457 } 458 nexthdr = next; 459 off += optlen; 460 } 461 return 0; 462 } 463 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); 464 465 /** 466 * ip6_tnl_err - tunnel error handler 467 * 468 * Description: 469 * ip6_tnl_err() should handle errors in the tunnel according 470 * to the specifications in RFC 2473. 471 **/ 472 473 static int 474 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, 475 u8 *type, u8 *code, int *msg, __u32 *info, int offset) 476 { 477 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; 478 struct net *net = dev_net(skb->dev); 479 u8 rel_type = ICMPV6_DEST_UNREACH; 480 u8 rel_code = ICMPV6_ADDR_UNREACH; 481 __u32 rel_info = 0; 482 struct ip6_tnl *t; 483 int err = -ENOENT; 484 int rel_msg = 0; 485 u8 tproto; 486 __u16 len; 487 488 /* If the packet doesn't contain the original IPv6 header we are 489 in trouble since we might need the source address for further 490 processing of the error. */ 491 492 rcu_read_lock(); 493 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); 494 if (!t) 495 goto out; 496 497 tproto = READ_ONCE(t->parms.proto); 498 if (tproto != ipproto && tproto != 0) 499 goto out; 500 501 err = 0; 502 503 switch (*type) { 504 struct ipv6_tlv_tnl_enc_lim *tel; 505 __u32 mtu, teli; 506 case ICMPV6_DEST_UNREACH: 507 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 508 t->parms.name); 509 rel_msg = 1; 510 break; 511 case ICMPV6_TIME_EXCEED: 512 if ((*code) == ICMPV6_EXC_HOPLIMIT) { 513 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 514 t->parms.name); 515 rel_msg = 1; 516 } 517 break; 518 case ICMPV6_PARAMPROB: 519 teli = 0; 520 if ((*code) == ICMPV6_HDR_FIELD) 521 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 522 523 if (teli && teli == *info - 2) { 524 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 525 if (tel->encap_limit == 0) { 526 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 527 t->parms.name); 528 rel_msg = 1; 529 } 530 } else { 531 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 532 t->parms.name); 533 } 534 break; 535 case ICMPV6_PKT_TOOBIG: 536 ip6_update_pmtu(skb, net, htonl(*info), 0, 0, 537 sock_net_uid(net, NULL)); 538 mtu = *info - offset; 539 if (mtu < IPV6_MIN_MTU) 540 mtu = IPV6_MIN_MTU; 541 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); 542 if (len > mtu) { 543 rel_type = ICMPV6_PKT_TOOBIG; 544 rel_code = 0; 545 rel_info = mtu; 546 rel_msg = 1; 547 } 548 break; 549 case NDISC_REDIRECT: 550 ip6_redirect(skb, net, skb->dev->ifindex, 0, 551 sock_net_uid(net, NULL)); 552 break; 553 } 554 555 *type = rel_type; 556 *code = rel_code; 557 *info = rel_info; 558 *msg = rel_msg; 559 560 out: 561 rcu_read_unlock(); 562 return err; 563 } 564 565 static int 566 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 567 u8 type, u8 code, int offset, __be32 info) 568 { 569 __u32 rel_info = ntohl(info); 570 const struct iphdr *eiph; 571 struct sk_buff *skb2; 572 int err, rel_msg = 0; 573 u8 rel_type = type; 574 u8 rel_code = code; 575 struct rtable *rt; 576 struct flowi4 fl4; 577 578 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, 579 &rel_msg, &rel_info, offset); 580 if (err < 0) 581 return err; 582 583 if (rel_msg == 0) 584 return 0; 585 586 switch (rel_type) { 587 case ICMPV6_DEST_UNREACH: 588 if (rel_code != ICMPV6_ADDR_UNREACH) 589 return 0; 590 rel_type = ICMP_DEST_UNREACH; 591 rel_code = ICMP_HOST_UNREACH; 592 break; 593 case ICMPV6_PKT_TOOBIG: 594 if (rel_code != 0) 595 return 0; 596 rel_type = ICMP_DEST_UNREACH; 597 rel_code = ICMP_FRAG_NEEDED; 598 break; 599 default: 600 return 0; 601 } 602 603 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) 604 return 0; 605 606 skb2 = skb_clone(skb, GFP_ATOMIC); 607 if (!skb2) 608 return 0; 609 610 skb_dst_drop(skb2); 611 612 skb_pull(skb2, offset); 613 skb_reset_network_header(skb2); 614 eiph = ip_hdr(skb2); 615 616 /* Try to guess incoming interface */ 617 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr, 618 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 619 if (IS_ERR(rt)) 620 goto out; 621 622 skb2->dev = rt->dst.dev; 623 ip_rt_put(rt); 624 625 /* route "incoming" packet */ 626 if (rt->rt_flags & RTCF_LOCAL) { 627 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, 628 eiph->daddr, eiph->saddr, 0, 0, 629 IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 630 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL) { 631 if (!IS_ERR(rt)) 632 ip_rt_put(rt); 633 goto out; 634 } 635 skb_dst_set(skb2, &rt->dst); 636 } else { 637 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, 638 skb2->dev) || 639 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) 640 goto out; 641 } 642 643 /* change mtu on this route */ 644 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { 645 if (rel_info > dst_mtu(skb_dst(skb2))) 646 goto out; 647 648 skb_dst_update_pmtu(skb2, rel_info); 649 } 650 651 icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); 652 653 out: 654 kfree_skb(skb2); 655 return 0; 656 } 657 658 static int 659 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 660 u8 type, u8 code, int offset, __be32 info) 661 { 662 __u32 rel_info = ntohl(info); 663 int err, rel_msg = 0; 664 u8 rel_type = type; 665 u8 rel_code = code; 666 667 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, 668 &rel_msg, &rel_info, offset); 669 if (err < 0) 670 return err; 671 672 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { 673 struct rt6_info *rt; 674 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 675 676 if (!skb2) 677 return 0; 678 679 skb_dst_drop(skb2); 680 skb_pull(skb2, offset); 681 skb_reset_network_header(skb2); 682 683 /* Try to guess incoming interface */ 684 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, 685 NULL, 0, skb2, 0); 686 687 if (rt && rt->dst.dev) 688 skb2->dev = rt->dst.dev; 689 690 icmpv6_send(skb2, rel_type, rel_code, rel_info); 691 692 ip6_rt_put(rt); 693 694 kfree_skb(skb2); 695 } 696 697 return 0; 698 } 699 700 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 701 const struct ipv6hdr *ipv6h, 702 struct sk_buff *skb) 703 { 704 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; 705 706 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 707 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); 708 709 return IP6_ECN_decapsulate(ipv6h, skb); 710 } 711 712 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 713 const struct ipv6hdr *ipv6h, 714 struct sk_buff *skb) 715 { 716 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 717 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); 718 719 return IP6_ECN_decapsulate(ipv6h, skb); 720 } 721 722 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, 723 const struct in6_addr *laddr, 724 const struct in6_addr *raddr) 725 { 726 struct __ip6_tnl_parm *p = &t->parms; 727 int ltype = ipv6_addr_type(laddr); 728 int rtype = ipv6_addr_type(raddr); 729 __u32 flags = 0; 730 731 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { 732 flags = IP6_TNL_F_CAP_PER_PACKET; 733 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 734 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 735 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && 736 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { 737 if (ltype&IPV6_ADDR_UNICAST) 738 flags |= IP6_TNL_F_CAP_XMIT; 739 if (rtype&IPV6_ADDR_UNICAST) 740 flags |= IP6_TNL_F_CAP_RCV; 741 } 742 return flags; 743 } 744 EXPORT_SYMBOL(ip6_tnl_get_cap); 745 746 /* called with rcu_read_lock() */ 747 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, 748 const struct in6_addr *laddr, 749 const struct in6_addr *raddr) 750 { 751 struct __ip6_tnl_parm *p = &t->parms; 752 int ret = 0; 753 struct net *net = t->net; 754 755 if ((p->flags & IP6_TNL_F_CAP_RCV) || 756 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 757 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { 758 struct net_device *ldev = NULL; 759 760 if (p->link) 761 ldev = dev_get_by_index_rcu(net, p->link); 762 763 if ((ipv6_addr_is_multicast(laddr) || 764 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false, 765 0, IFA_F_TENTATIVE))) && 766 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) || 767 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true, 768 0, IFA_F_TENTATIVE)))) 769 ret = 1; 770 } 771 return ret; 772 } 773 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); 774 775 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 776 const struct tnl_ptk_info *tpi, 777 struct metadata_dst *tun_dst, 778 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 779 const struct ipv6hdr *ipv6h, 780 struct sk_buff *skb), 781 bool log_ecn_err) 782 { 783 struct pcpu_sw_netstats *tstats; 784 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 785 int err; 786 787 if ((!(tpi->flags & TUNNEL_CSUM) && 788 (tunnel->parms.i_flags & TUNNEL_CSUM)) || 789 ((tpi->flags & TUNNEL_CSUM) && 790 !(tunnel->parms.i_flags & TUNNEL_CSUM))) { 791 tunnel->dev->stats.rx_crc_errors++; 792 tunnel->dev->stats.rx_errors++; 793 goto drop; 794 } 795 796 if (tunnel->parms.i_flags & TUNNEL_SEQ) { 797 if (!(tpi->flags & TUNNEL_SEQ) || 798 (tunnel->i_seqno && 799 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { 800 tunnel->dev->stats.rx_fifo_errors++; 801 tunnel->dev->stats.rx_errors++; 802 goto drop; 803 } 804 tunnel->i_seqno = ntohl(tpi->seq) + 1; 805 } 806 807 skb->protocol = tpi->proto; 808 809 /* Warning: All skb pointers will be invalidated! */ 810 if (tunnel->dev->type == ARPHRD_ETHER) { 811 if (!pskb_may_pull(skb, ETH_HLEN)) { 812 tunnel->dev->stats.rx_length_errors++; 813 tunnel->dev->stats.rx_errors++; 814 goto drop; 815 } 816 817 ipv6h = ipv6_hdr(skb); 818 skb->protocol = eth_type_trans(skb, tunnel->dev); 819 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 820 } else { 821 skb->dev = tunnel->dev; 822 } 823 824 skb_reset_network_header(skb); 825 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 826 827 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); 828 829 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); 830 if (unlikely(err)) { 831 if (log_ecn_err) 832 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", 833 &ipv6h->saddr, 834 ipv6_get_dsfield(ipv6h)); 835 if (err > 1) { 836 ++tunnel->dev->stats.rx_frame_errors; 837 ++tunnel->dev->stats.rx_errors; 838 goto drop; 839 } 840 } 841 842 tstats = this_cpu_ptr(tunnel->dev->tstats); 843 u64_stats_update_begin(&tstats->syncp); 844 tstats->rx_packets++; 845 tstats->rx_bytes += skb->len; 846 u64_stats_update_end(&tstats->syncp); 847 848 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); 849 850 if (tun_dst) 851 skb_dst_set(skb, (struct dst_entry *)tun_dst); 852 853 gro_cells_receive(&tunnel->gro_cells, skb); 854 return 0; 855 856 drop: 857 if (tun_dst) 858 dst_release((struct dst_entry *)tun_dst); 859 kfree_skb(skb); 860 return 0; 861 } 862 863 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, 864 const struct tnl_ptk_info *tpi, 865 struct metadata_dst *tun_dst, 866 bool log_ecn_err) 867 { 868 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, ip6ip6_dscp_ecn_decapsulate, 869 log_ecn_err); 870 } 871 EXPORT_SYMBOL(ip6_tnl_rcv); 872 873 static const struct tnl_ptk_info tpi_v6 = { 874 /* no tunnel info required for ipxip6. */ 875 .proto = htons(ETH_P_IPV6), 876 }; 877 878 static const struct tnl_ptk_info tpi_v4 = { 879 /* no tunnel info required for ipxip6. */ 880 .proto = htons(ETH_P_IP), 881 }; 882 883 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, 884 const struct tnl_ptk_info *tpi, 885 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 886 const struct ipv6hdr *ipv6h, 887 struct sk_buff *skb)) 888 { 889 struct ip6_tnl *t; 890 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 891 struct metadata_dst *tun_dst = NULL; 892 int ret = -1; 893 894 rcu_read_lock(); 895 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); 896 897 if (t) { 898 u8 tproto = READ_ONCE(t->parms.proto); 899 900 if (tproto != ipproto && tproto != 0) 901 goto drop; 902 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 903 goto drop; 904 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) 905 goto drop; 906 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 907 goto drop; 908 if (t->parms.collect_md) { 909 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0); 910 if (!tun_dst) 911 goto drop; 912 } 913 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, 914 log_ecn_error); 915 } 916 917 rcu_read_unlock(); 918 919 return ret; 920 921 drop: 922 rcu_read_unlock(); 923 kfree_skb(skb); 924 return 0; 925 } 926 927 static int ip4ip6_rcv(struct sk_buff *skb) 928 { 929 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4, 930 ip4ip6_dscp_ecn_decapsulate); 931 } 932 933 static int ip6ip6_rcv(struct sk_buff *skb) 934 { 935 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, 936 ip6ip6_dscp_ecn_decapsulate); 937 } 938 939 struct ipv6_tel_txoption { 940 struct ipv6_txoptions ops; 941 __u8 dst_opt[8]; 942 }; 943 944 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) 945 { 946 memset(opt, 0, sizeof(struct ipv6_tel_txoption)); 947 948 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; 949 opt->dst_opt[3] = 1; 950 opt->dst_opt[4] = encap_limit; 951 opt->dst_opt[5] = IPV6_TLV_PADN; 952 opt->dst_opt[6] = 1; 953 954 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt; 955 opt->ops.opt_nflen = 8; 956 } 957 958 /** 959 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 960 * @t: the outgoing tunnel device 961 * @hdr: IPv6 header from the incoming packet 962 * 963 * Description: 964 * Avoid trivial tunneling loop by checking that tunnel exit-point 965 * doesn't match source of incoming packet. 966 * 967 * Return: 968 * 1 if conflict, 969 * 0 else 970 **/ 971 972 static inline bool 973 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) 974 { 975 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 976 } 977 978 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, 979 const struct in6_addr *laddr, 980 const struct in6_addr *raddr) 981 { 982 struct __ip6_tnl_parm *p = &t->parms; 983 int ret = 0; 984 struct net *net = t->net; 985 986 if (t->parms.collect_md) 987 return 1; 988 989 if ((p->flags & IP6_TNL_F_CAP_XMIT) || 990 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 991 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { 992 struct net_device *ldev = NULL; 993 994 rcu_read_lock(); 995 if (p->link) 996 ldev = dev_get_by_index_rcu(net, p->link); 997 998 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false, 999 0, IFA_F_TENTATIVE))) 1000 pr_warn("%s xmit: Local address not yet configured!\n", 1001 p->name); 1002 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) && 1003 !ipv6_addr_is_multicast(raddr) && 1004 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev, 1005 true, 0, IFA_F_TENTATIVE))) 1006 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", 1007 p->name); 1008 else 1009 ret = 1; 1010 rcu_read_unlock(); 1011 } 1012 return ret; 1013 } 1014 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); 1015 1016 /** 1017 * ip6_tnl_xmit - encapsulate packet and send 1018 * @skb: the outgoing socket buffer 1019 * @dev: the outgoing tunnel device 1020 * @dsfield: dscp code for outer header 1021 * @fl6: flow of tunneled packet 1022 * @encap_limit: encapsulation limit 1023 * @pmtu: Path MTU is stored if packet is too big 1024 * @proto: next header value 1025 * 1026 * Description: 1027 * Build new header and do some sanity checks on the packet before sending 1028 * it. 1029 * 1030 * Return: 1031 * 0 on success 1032 * -1 fail 1033 * %-EMSGSIZE message too big. return mtu in this case. 1034 **/ 1035 1036 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 1037 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, 1038 __u8 proto) 1039 { 1040 struct ip6_tnl *t = netdev_priv(dev); 1041 struct net *net = t->net; 1042 struct net_device_stats *stats = &t->dev->stats; 1043 struct ipv6hdr *ipv6h; 1044 struct ipv6_tel_txoption opt; 1045 struct dst_entry *dst = NULL, *ndst = NULL; 1046 struct net_device *tdev; 1047 int mtu; 1048 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0; 1049 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; 1050 unsigned int max_headroom = psh_hlen; 1051 bool use_cache = false; 1052 u8 hop_limit; 1053 int err = -1; 1054 1055 if (t->parms.collect_md) { 1056 hop_limit = skb_tunnel_info(skb)->key.ttl; 1057 goto route_lookup; 1058 } else { 1059 hop_limit = t->parms.hop_limit; 1060 } 1061 1062 /* NBMA tunnel */ 1063 if (ipv6_addr_any(&t->parms.raddr)) { 1064 if (skb->protocol == htons(ETH_P_IPV6)) { 1065 struct in6_addr *addr6; 1066 struct neighbour *neigh; 1067 int addr_type; 1068 1069 if (!skb_dst(skb)) 1070 goto tx_err_link_failure; 1071 1072 neigh = dst_neigh_lookup(skb_dst(skb), 1073 &ipv6_hdr(skb)->daddr); 1074 if (!neigh) 1075 goto tx_err_link_failure; 1076 1077 addr6 = (struct in6_addr *)&neigh->primary_key; 1078 addr_type = ipv6_addr_type(addr6); 1079 1080 if (addr_type == IPV6_ADDR_ANY) 1081 addr6 = &ipv6_hdr(skb)->daddr; 1082 1083 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); 1084 neigh_release(neigh); 1085 } 1086 } else if (t->parms.proto != 0 && !(t->parms.flags & 1087 (IP6_TNL_F_USE_ORIG_TCLASS | 1088 IP6_TNL_F_USE_ORIG_FWMARK))) { 1089 /* enable the cache only if neither the outer protocol nor the 1090 * routing decision depends on the current inner header value 1091 */ 1092 use_cache = true; 1093 } 1094 1095 if (use_cache) 1096 dst = dst_cache_get(&t->dst_cache); 1097 1098 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) 1099 goto tx_err_link_failure; 1100 1101 if (!dst) { 1102 route_lookup: 1103 /* add dsfield to flowlabel for route lookup */ 1104 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel); 1105 1106 dst = ip6_route_output(net, NULL, fl6); 1107 1108 if (dst->error) 1109 goto tx_err_link_failure; 1110 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); 1111 if (IS_ERR(dst)) { 1112 err = PTR_ERR(dst); 1113 dst = NULL; 1114 goto tx_err_link_failure; 1115 } 1116 if (t->parms.collect_md && 1117 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, 1118 &fl6->daddr, 0, &fl6->saddr)) 1119 goto tx_err_link_failure; 1120 ndst = dst; 1121 } 1122 1123 tdev = dst->dev; 1124 1125 if (tdev == dev) { 1126 stats->collisions++; 1127 net_warn_ratelimited("%s: Local routing loop detected!\n", 1128 t->parms.name); 1129 goto tx_err_dst_release; 1130 } 1131 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen; 1132 if (encap_limit >= 0) { 1133 max_headroom += 8; 1134 mtu -= 8; 1135 } 1136 if (skb->protocol == htons(ETH_P_IPV6)) { 1137 if (mtu < IPV6_MIN_MTU) 1138 mtu = IPV6_MIN_MTU; 1139 } else if (mtu < 576) { 1140 mtu = 576; 1141 } 1142 1143 skb_dst_update_pmtu(skb, mtu); 1144 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) { 1145 *pmtu = mtu; 1146 err = -EMSGSIZE; 1147 goto tx_err_dst_release; 1148 } 1149 1150 if (t->err_count > 0) { 1151 if (time_before(jiffies, 1152 t->err_time + IP6TUNNEL_ERR_TIMEO)) { 1153 t->err_count--; 1154 1155 dst_link_failure(skb); 1156 } else { 1157 t->err_count = 0; 1158 } 1159 } 1160 1161 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); 1162 1163 /* 1164 * Okay, now see if we can stuff it in the buffer as-is. 1165 */ 1166 max_headroom += LL_RESERVED_SPACE(tdev); 1167 1168 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1169 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1170 struct sk_buff *new_skb; 1171 1172 new_skb = skb_realloc_headroom(skb, max_headroom); 1173 if (!new_skb) 1174 goto tx_err_dst_release; 1175 1176 if (skb->sk) 1177 skb_set_owner_w(new_skb, skb->sk); 1178 consume_skb(skb); 1179 skb = new_skb; 1180 } 1181 1182 if (t->parms.collect_md) { 1183 if (t->encap.type != TUNNEL_ENCAP_NONE) 1184 goto tx_err_dst_release; 1185 } else { 1186 if (use_cache && ndst) 1187 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); 1188 } 1189 skb_dst_set(skb, dst); 1190 1191 if (encap_limit >= 0) { 1192 init_tel_txopt(&opt, encap_limit); 1193 ipv6_push_frag_opts(skb, &opt.ops, &proto); 1194 } 1195 hop_limit = hop_limit ? : ip6_dst_hoplimit(dst); 1196 1197 /* Calculate max headroom for all the headers and adjust 1198 * needed_headroom if necessary. 1199 */ 1200 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) 1201 + dst->header_len + t->hlen; 1202 if (max_headroom > dev->needed_headroom) 1203 dev->needed_headroom = max_headroom; 1204 1205 err = ip6_tnl_encap(skb, t, &proto, fl6); 1206 if (err) 1207 return err; 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 = ip_hdr(skb); 1234 int encap_limit = -1; 1235 struct flowi6 fl6; 1236 __u8 dsfield; 1237 __u32 mtu; 1238 u8 tproto; 1239 int err; 1240 1241 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1242 1243 tproto = READ_ONCE(t->parms.proto); 1244 if (tproto != IPPROTO_IPIP && tproto != 0) 1245 return -1; 1246 1247 if (t->parms.collect_md) { 1248 struct ip_tunnel_info *tun_info; 1249 const struct ip_tunnel_key *key; 1250 1251 tun_info = skb_tunnel_info(skb); 1252 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1253 ip_tunnel_info_af(tun_info) != AF_INET6)) 1254 return -1; 1255 key = &tun_info->key; 1256 memset(&fl6, 0, sizeof(fl6)); 1257 fl6.flowi6_proto = IPPROTO_IPIP; 1258 fl6.daddr = key->u.ipv6.dst; 1259 fl6.flowlabel = key->label; 1260 dsfield = key->tos; 1261 } else { 1262 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1263 encap_limit = t->parms.encap_limit; 1264 1265 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1266 fl6.flowi6_proto = IPPROTO_IPIP; 1267 1268 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1269 dsfield = ipv4_get_dsfield(iph); 1270 else 1271 dsfield = ip6_tclass(t->parms.flowinfo); 1272 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1273 fl6.flowi6_mark = skb->mark; 1274 else 1275 fl6.flowi6_mark = t->parms.fwmark; 1276 } 1277 1278 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1279 1280 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1281 return -1; 1282 1283 dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph)); 1284 1285 skb_set_inner_ipproto(skb, IPPROTO_IPIP); 1286 1287 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1288 IPPROTO_IPIP); 1289 if (err != 0) { 1290 /* XXX: send ICMP error even if DF is not set. */ 1291 if (err == -EMSGSIZE) 1292 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 1293 htonl(mtu)); 1294 return -1; 1295 } 1296 1297 return 0; 1298 } 1299 1300 static inline int 1301 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1302 { 1303 struct ip6_tnl *t = netdev_priv(dev); 1304 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 1305 int encap_limit = -1; 1306 __u16 offset; 1307 struct flowi6 fl6; 1308 __u8 dsfield; 1309 __u32 mtu; 1310 u8 tproto; 1311 int err; 1312 1313 tproto = READ_ONCE(t->parms.proto); 1314 if ((tproto != IPPROTO_IPV6 && tproto != 0) || 1315 ip6_tnl_addr_conflict(t, ipv6h)) 1316 return -1; 1317 1318 if (t->parms.collect_md) { 1319 struct ip_tunnel_info *tun_info; 1320 const struct ip_tunnel_key *key; 1321 1322 tun_info = skb_tunnel_info(skb); 1323 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1324 ip_tunnel_info_af(tun_info) != AF_INET6)) 1325 return -1; 1326 key = &tun_info->key; 1327 memset(&fl6, 0, sizeof(fl6)); 1328 fl6.flowi6_proto = IPPROTO_IPV6; 1329 fl6.daddr = key->u.ipv6.dst; 1330 fl6.flowlabel = key->label; 1331 dsfield = key->tos; 1332 } else { 1333 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 1334 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 1335 ipv6h = ipv6_hdr(skb); 1336 if (offset > 0) { 1337 struct ipv6_tlv_tnl_enc_lim *tel; 1338 1339 tel = (void *)&skb_network_header(skb)[offset]; 1340 if (tel->encap_limit == 0) { 1341 icmpv6_send(skb, ICMPV6_PARAMPROB, 1342 ICMPV6_HDR_FIELD, offset + 2); 1343 return -1; 1344 } 1345 encap_limit = tel->encap_limit - 1; 1346 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 1347 encap_limit = t->parms.encap_limit; 1348 } 1349 1350 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1351 fl6.flowi6_proto = IPPROTO_IPV6; 1352 1353 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1354 dsfield = ipv6_get_dsfield(ipv6h); 1355 else 1356 dsfield = ip6_tclass(t->parms.flowinfo); 1357 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 1358 fl6.flowlabel |= ip6_flowlabel(ipv6h); 1359 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1360 fl6.flowi6_mark = skb->mark; 1361 else 1362 fl6.flowi6_mark = t->parms.fwmark; 1363 } 1364 1365 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1366 1367 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1368 return -1; 1369 1370 dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h)); 1371 1372 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1373 1374 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1375 IPPROTO_IPV6); 1376 if (err != 0) { 1377 if (err == -EMSGSIZE) 1378 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1379 return -1; 1380 } 1381 1382 return 0; 1383 } 1384 1385 static netdev_tx_t 1386 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) 1387 { 1388 struct ip6_tnl *t = netdev_priv(dev); 1389 struct net_device_stats *stats = &t->dev->stats; 1390 int ret; 1391 1392 switch (skb->protocol) { 1393 case htons(ETH_P_IP): 1394 ret = ip4ip6_tnl_xmit(skb, dev); 1395 break; 1396 case htons(ETH_P_IPV6): 1397 ret = ip6ip6_tnl_xmit(skb, dev); 1398 break; 1399 default: 1400 goto tx_err; 1401 } 1402 1403 if (ret < 0) 1404 goto tx_err; 1405 1406 return NETDEV_TX_OK; 1407 1408 tx_err: 1409 stats->tx_errors++; 1410 stats->tx_dropped++; 1411 kfree_skb(skb); 1412 return NETDEV_TX_OK; 1413 } 1414 1415 static void ip6_tnl_link_config(struct ip6_tnl *t) 1416 { 1417 struct net_device *dev = t->dev; 1418 struct __ip6_tnl_parm *p = &t->parms; 1419 struct flowi6 *fl6 = &t->fl.u.ip6; 1420 int t_hlen; 1421 1422 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1423 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1424 1425 /* Set up flowi template */ 1426 fl6->saddr = p->laddr; 1427 fl6->daddr = p->raddr; 1428 fl6->flowi6_oif = p->link; 1429 fl6->flowlabel = 0; 1430 1431 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1432 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1433 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1434 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1435 1436 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1437 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1438 1439 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) 1440 dev->flags |= IFF_POINTOPOINT; 1441 else 1442 dev->flags &= ~IFF_POINTOPOINT; 1443 1444 t->tun_hlen = 0; 1445 t->hlen = t->encap_hlen + t->tun_hlen; 1446 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1447 1448 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1449 int strict = (ipv6_addr_type(&p->raddr) & 1450 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1451 1452 struct rt6_info *rt = rt6_lookup(t->net, 1453 &p->raddr, &p->laddr, 1454 p->link, NULL, strict); 1455 1456 if (!rt) 1457 return; 1458 1459 if (rt->dst.dev) { 1460 dev->hard_header_len = rt->dst.dev->hard_header_len + 1461 t_hlen; 1462 1463 dev->mtu = rt->dst.dev->mtu - t_hlen; 1464 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1465 dev->mtu -= 8; 1466 1467 if (dev->mtu < IPV6_MIN_MTU) 1468 dev->mtu = IPV6_MIN_MTU; 1469 } 1470 ip6_rt_put(rt); 1471 } 1472 } 1473 1474 /** 1475 * ip6_tnl_change - update the tunnel parameters 1476 * @t: tunnel to be changed 1477 * @p: tunnel configuration parameters 1478 * 1479 * Description: 1480 * ip6_tnl_change() updates the tunnel parameters 1481 **/ 1482 1483 static int 1484 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) 1485 { 1486 t->parms.laddr = p->laddr; 1487 t->parms.raddr = p->raddr; 1488 t->parms.flags = p->flags; 1489 t->parms.hop_limit = p->hop_limit; 1490 t->parms.encap_limit = p->encap_limit; 1491 t->parms.flowinfo = p->flowinfo; 1492 t->parms.link = p->link; 1493 t->parms.proto = p->proto; 1494 t->parms.fwmark = p->fwmark; 1495 dst_cache_reset(&t->dst_cache); 1496 ip6_tnl_link_config(t); 1497 return 0; 1498 } 1499 1500 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1501 { 1502 struct net *net = t->net; 1503 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1504 int err; 1505 1506 ip6_tnl_unlink(ip6n, t); 1507 synchronize_net(); 1508 err = ip6_tnl_change(t, p); 1509 ip6_tnl_link(ip6n, t); 1510 netdev_state_change(t->dev); 1511 return err; 1512 } 1513 1514 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1515 { 1516 /* for default tnl0 device allow to change only the proto */ 1517 t->parms.proto = p->proto; 1518 netdev_state_change(t->dev); 1519 return 0; 1520 } 1521 1522 static void 1523 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) 1524 { 1525 p->laddr = u->laddr; 1526 p->raddr = u->raddr; 1527 p->flags = u->flags; 1528 p->hop_limit = u->hop_limit; 1529 p->encap_limit = u->encap_limit; 1530 p->flowinfo = u->flowinfo; 1531 p->link = u->link; 1532 p->proto = u->proto; 1533 memcpy(p->name, u->name, sizeof(u->name)); 1534 } 1535 1536 static void 1537 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) 1538 { 1539 u->laddr = p->laddr; 1540 u->raddr = p->raddr; 1541 u->flags = p->flags; 1542 u->hop_limit = p->hop_limit; 1543 u->encap_limit = p->encap_limit; 1544 u->flowinfo = p->flowinfo; 1545 u->link = p->link; 1546 u->proto = p->proto; 1547 memcpy(u->name, p->name, sizeof(u->name)); 1548 } 1549 1550 /** 1551 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace 1552 * @dev: virtual device associated with tunnel 1553 * @ifr: parameters passed from userspace 1554 * @cmd: command to be performed 1555 * 1556 * Description: 1557 * ip6_tnl_ioctl() is used for managing IPv6 tunnels 1558 * from userspace. 1559 * 1560 * The possible commands are the following: 1561 * %SIOCGETTUNNEL: get tunnel parameters for device 1562 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 1563 * %SIOCCHGTUNNEL: change tunnel parameters to those given 1564 * %SIOCDELTUNNEL: delete tunnel 1565 * 1566 * The fallback device "ip6tnl0", created during module 1567 * initialization, can be used for creating other tunnel devices. 1568 * 1569 * Return: 1570 * 0 on success, 1571 * %-EFAULT if unable to copy data to or from userspace, 1572 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 1573 * %-EINVAL if passed tunnel parameters are invalid, 1574 * %-EEXIST if changing a tunnel's parameters would cause a conflict 1575 * %-ENODEV if attempting to change or delete a nonexisting device 1576 **/ 1577 1578 static int 1579 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1580 { 1581 int err = 0; 1582 struct ip6_tnl_parm p; 1583 struct __ip6_tnl_parm p1; 1584 struct ip6_tnl *t = netdev_priv(dev); 1585 struct net *net = t->net; 1586 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1587 1588 memset(&p1, 0, sizeof(p1)); 1589 1590 switch (cmd) { 1591 case SIOCGETTUNNEL: 1592 if (dev == ip6n->fb_tnl_dev) { 1593 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1594 err = -EFAULT; 1595 break; 1596 } 1597 ip6_tnl_parm_from_user(&p1, &p); 1598 t = ip6_tnl_locate(net, &p1, 0); 1599 if (IS_ERR(t)) 1600 t = netdev_priv(dev); 1601 } else { 1602 memset(&p, 0, sizeof(p)); 1603 } 1604 ip6_tnl_parm_to_user(&p, &t->parms); 1605 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { 1606 err = -EFAULT; 1607 } 1608 break; 1609 case SIOCADDTUNNEL: 1610 case SIOCCHGTUNNEL: 1611 err = -EPERM; 1612 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1613 break; 1614 err = -EFAULT; 1615 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1616 break; 1617 err = -EINVAL; 1618 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 1619 p.proto != 0) 1620 break; 1621 ip6_tnl_parm_from_user(&p1, &p); 1622 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); 1623 if (cmd == SIOCCHGTUNNEL) { 1624 if (!IS_ERR(t)) { 1625 if (t->dev != dev) { 1626 err = -EEXIST; 1627 break; 1628 } 1629 } else 1630 t = netdev_priv(dev); 1631 if (dev == ip6n->fb_tnl_dev) 1632 err = ip6_tnl0_update(t, &p1); 1633 else 1634 err = ip6_tnl_update(t, &p1); 1635 } 1636 if (!IS_ERR(t)) { 1637 err = 0; 1638 ip6_tnl_parm_to_user(&p, &t->parms); 1639 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1640 err = -EFAULT; 1641 1642 } else { 1643 err = PTR_ERR(t); 1644 } 1645 break; 1646 case SIOCDELTUNNEL: 1647 err = -EPERM; 1648 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1649 break; 1650 1651 if (dev == ip6n->fb_tnl_dev) { 1652 err = -EFAULT; 1653 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1654 break; 1655 err = -ENOENT; 1656 ip6_tnl_parm_from_user(&p1, &p); 1657 t = ip6_tnl_locate(net, &p1, 0); 1658 if (IS_ERR(t)) 1659 break; 1660 err = -EPERM; 1661 if (t->dev == ip6n->fb_tnl_dev) 1662 break; 1663 dev = t->dev; 1664 } 1665 err = 0; 1666 unregister_netdevice(dev); 1667 break; 1668 default: 1669 err = -EINVAL; 1670 } 1671 return err; 1672 } 1673 1674 /** 1675 * ip6_tnl_change_mtu - change mtu manually for tunnel device 1676 * @dev: virtual device associated with tunnel 1677 * @new_mtu: the new mtu 1678 * 1679 * Return: 1680 * 0 on success, 1681 * %-EINVAL if mtu too small 1682 **/ 1683 1684 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) 1685 { 1686 struct ip6_tnl *tnl = netdev_priv(dev); 1687 1688 if (tnl->parms.proto == IPPROTO_IPV6) { 1689 if (new_mtu < IPV6_MIN_MTU) 1690 return -EINVAL; 1691 } else { 1692 if (new_mtu < ETH_MIN_MTU) 1693 return -EINVAL; 1694 } 1695 if (new_mtu > 0xFFF8 - dev->hard_header_len) 1696 return -EINVAL; 1697 dev->mtu = new_mtu; 1698 return 0; 1699 } 1700 EXPORT_SYMBOL(ip6_tnl_change_mtu); 1701 1702 int ip6_tnl_get_iflink(const struct net_device *dev) 1703 { 1704 struct ip6_tnl *t = netdev_priv(dev); 1705 1706 return t->parms.link; 1707 } 1708 EXPORT_SYMBOL(ip6_tnl_get_iflink); 1709 1710 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 1711 unsigned int num) 1712 { 1713 if (num >= MAX_IPTUN_ENCAP_OPS) 1714 return -ERANGE; 1715 1716 return !cmpxchg((const struct ip6_tnl_encap_ops **) 1717 &ip6tun_encaps[num], 1718 NULL, ops) ? 0 : -1; 1719 } 1720 EXPORT_SYMBOL(ip6_tnl_encap_add_ops); 1721 1722 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 1723 unsigned int num) 1724 { 1725 int ret; 1726 1727 if (num >= MAX_IPTUN_ENCAP_OPS) 1728 return -ERANGE; 1729 1730 ret = (cmpxchg((const struct ip6_tnl_encap_ops **) 1731 &ip6tun_encaps[num], 1732 ops, NULL) == ops) ? 0 : -1; 1733 1734 synchronize_net(); 1735 1736 return ret; 1737 } 1738 EXPORT_SYMBOL(ip6_tnl_encap_del_ops); 1739 1740 int ip6_tnl_encap_setup(struct ip6_tnl *t, 1741 struct ip_tunnel_encap *ipencap) 1742 { 1743 int hlen; 1744 1745 memset(&t->encap, 0, sizeof(t->encap)); 1746 1747 hlen = ip6_encap_hlen(ipencap); 1748 if (hlen < 0) 1749 return hlen; 1750 1751 t->encap.type = ipencap->type; 1752 t->encap.sport = ipencap->sport; 1753 t->encap.dport = ipencap->dport; 1754 t->encap.flags = ipencap->flags; 1755 1756 t->encap_hlen = hlen; 1757 t->hlen = t->encap_hlen + t->tun_hlen; 1758 1759 return 0; 1760 } 1761 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); 1762 1763 static const struct net_device_ops ip6_tnl_netdev_ops = { 1764 .ndo_init = ip6_tnl_dev_init, 1765 .ndo_uninit = ip6_tnl_dev_uninit, 1766 .ndo_start_xmit = ip6_tnl_start_xmit, 1767 .ndo_do_ioctl = ip6_tnl_ioctl, 1768 .ndo_change_mtu = ip6_tnl_change_mtu, 1769 .ndo_get_stats = ip6_get_stats, 1770 .ndo_get_iflink = ip6_tnl_get_iflink, 1771 }; 1772 1773 #define IPXIPX_FEATURES (NETIF_F_SG | \ 1774 NETIF_F_FRAGLIST | \ 1775 NETIF_F_HIGHDMA | \ 1776 NETIF_F_GSO_SOFTWARE | \ 1777 NETIF_F_HW_CSUM) 1778 1779 /** 1780 * ip6_tnl_dev_setup - setup virtual tunnel device 1781 * @dev: virtual device associated with tunnel 1782 * 1783 * Description: 1784 * Initialize function pointers and device parameters 1785 **/ 1786 1787 static void ip6_tnl_dev_setup(struct net_device *dev) 1788 { 1789 dev->netdev_ops = &ip6_tnl_netdev_ops; 1790 dev->needs_free_netdev = true; 1791 dev->priv_destructor = ip6_dev_free; 1792 1793 dev->type = ARPHRD_TUNNEL6; 1794 dev->flags |= IFF_NOARP; 1795 dev->addr_len = sizeof(struct in6_addr); 1796 dev->features |= NETIF_F_LLTX; 1797 netif_keep_dst(dev); 1798 1799 dev->features |= IPXIPX_FEATURES; 1800 dev->hw_features |= IPXIPX_FEATURES; 1801 1802 /* This perm addr will be used as interface identifier by IPv6 */ 1803 dev->addr_assign_type = NET_ADDR_RANDOM; 1804 eth_random_addr(dev->perm_addr); 1805 } 1806 1807 1808 /** 1809 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices 1810 * @dev: virtual device associated with tunnel 1811 **/ 1812 1813 static inline int 1814 ip6_tnl_dev_init_gen(struct net_device *dev) 1815 { 1816 struct ip6_tnl *t = netdev_priv(dev); 1817 int ret; 1818 int t_hlen; 1819 1820 t->dev = dev; 1821 t->net = dev_net(dev); 1822 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1823 if (!dev->tstats) 1824 return -ENOMEM; 1825 1826 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); 1827 if (ret) 1828 goto free_stats; 1829 1830 ret = gro_cells_init(&t->gro_cells, dev); 1831 if (ret) 1832 goto destroy_dst; 1833 1834 t->tun_hlen = 0; 1835 t->hlen = t->encap_hlen + t->tun_hlen; 1836 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1837 1838 dev->type = ARPHRD_TUNNEL6; 1839 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1840 dev->mtu = ETH_DATA_LEN - t_hlen; 1841 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1842 dev->mtu -= 8; 1843 dev->min_mtu = ETH_MIN_MTU; 1844 dev->max_mtu = 0xFFF8 - dev->hard_header_len; 1845 1846 return 0; 1847 1848 destroy_dst: 1849 dst_cache_destroy(&t->dst_cache); 1850 free_stats: 1851 free_percpu(dev->tstats); 1852 dev->tstats = NULL; 1853 1854 return ret; 1855 } 1856 1857 /** 1858 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices 1859 * @dev: virtual device associated with tunnel 1860 **/ 1861 1862 static int ip6_tnl_dev_init(struct net_device *dev) 1863 { 1864 struct ip6_tnl *t = netdev_priv(dev); 1865 int err = ip6_tnl_dev_init_gen(dev); 1866 1867 if (err) 1868 return err; 1869 ip6_tnl_link_config(t); 1870 if (t->parms.collect_md) { 1871 dev->features |= NETIF_F_NETNS_LOCAL; 1872 netif_keep_dst(dev); 1873 } 1874 return 0; 1875 } 1876 1877 /** 1878 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device 1879 * @dev: fallback device 1880 * 1881 * Return: 0 1882 **/ 1883 1884 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) 1885 { 1886 struct ip6_tnl *t = netdev_priv(dev); 1887 struct net *net = dev_net(dev); 1888 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1889 1890 t->parms.proto = IPPROTO_IPV6; 1891 dev_hold(dev); 1892 1893 rcu_assign_pointer(ip6n->tnls_wc[0], t); 1894 return 0; 1895 } 1896 1897 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[], 1898 struct netlink_ext_ack *extack) 1899 { 1900 u8 proto; 1901 1902 if (!data || !data[IFLA_IPTUN_PROTO]) 1903 return 0; 1904 1905 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1906 if (proto != IPPROTO_IPV6 && 1907 proto != IPPROTO_IPIP && 1908 proto != 0) 1909 return -EINVAL; 1910 1911 return 0; 1912 } 1913 1914 static void ip6_tnl_netlink_parms(struct nlattr *data[], 1915 struct __ip6_tnl_parm *parms) 1916 { 1917 memset(parms, 0, sizeof(*parms)); 1918 1919 if (!data) 1920 return; 1921 1922 if (data[IFLA_IPTUN_LINK]) 1923 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1924 1925 if (data[IFLA_IPTUN_LOCAL]) 1926 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); 1927 1928 if (data[IFLA_IPTUN_REMOTE]) 1929 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); 1930 1931 if (data[IFLA_IPTUN_TTL]) 1932 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); 1933 1934 if (data[IFLA_IPTUN_ENCAP_LIMIT]) 1935 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); 1936 1937 if (data[IFLA_IPTUN_FLOWINFO]) 1938 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); 1939 1940 if (data[IFLA_IPTUN_FLAGS]) 1941 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); 1942 1943 if (data[IFLA_IPTUN_PROTO]) 1944 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1945 1946 if (data[IFLA_IPTUN_COLLECT_METADATA]) 1947 parms->collect_md = true; 1948 1949 if (data[IFLA_IPTUN_FWMARK]) 1950 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1951 } 1952 1953 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], 1954 struct ip_tunnel_encap *ipencap) 1955 { 1956 bool ret = false; 1957 1958 memset(ipencap, 0, sizeof(*ipencap)); 1959 1960 if (!data) 1961 return ret; 1962 1963 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1964 ret = true; 1965 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1966 } 1967 1968 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1969 ret = true; 1970 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1971 } 1972 1973 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1974 ret = true; 1975 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1976 } 1977 1978 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1979 ret = true; 1980 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1981 } 1982 1983 return ret; 1984 } 1985 1986 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, 1987 struct nlattr *tb[], struct nlattr *data[], 1988 struct netlink_ext_ack *extack) 1989 { 1990 struct net *net = dev_net(dev); 1991 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1992 struct ip_tunnel_encap ipencap; 1993 struct ip6_tnl *nt, *t; 1994 int err; 1995 1996 nt = netdev_priv(dev); 1997 1998 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 1999 err = ip6_tnl_encap_setup(nt, &ipencap); 2000 if (err < 0) 2001 return err; 2002 } 2003 2004 ip6_tnl_netlink_parms(data, &nt->parms); 2005 2006 if (nt->parms.collect_md) { 2007 if (rtnl_dereference(ip6n->collect_md_tun)) 2008 return -EEXIST; 2009 } else { 2010 t = ip6_tnl_locate(net, &nt->parms, 0); 2011 if (!IS_ERR(t)) 2012 return -EEXIST; 2013 } 2014 2015 err = ip6_tnl_create2(dev); 2016 if (!err && tb[IFLA_MTU]) 2017 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 2018 2019 return err; 2020 } 2021 2022 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], 2023 struct nlattr *data[], 2024 struct netlink_ext_ack *extack) 2025 { 2026 struct ip6_tnl *t = netdev_priv(dev); 2027 struct __ip6_tnl_parm p; 2028 struct net *net = t->net; 2029 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2030 struct ip_tunnel_encap ipencap; 2031 2032 if (dev == ip6n->fb_tnl_dev) 2033 return -EINVAL; 2034 2035 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 2036 int err = ip6_tnl_encap_setup(t, &ipencap); 2037 2038 if (err < 0) 2039 return err; 2040 } 2041 ip6_tnl_netlink_parms(data, &p); 2042 if (p.collect_md) 2043 return -EINVAL; 2044 2045 t = ip6_tnl_locate(net, &p, 0); 2046 if (!IS_ERR(t)) { 2047 if (t->dev != dev) 2048 return -EEXIST; 2049 } else 2050 t = netdev_priv(dev); 2051 2052 return ip6_tnl_update(t, &p); 2053 } 2054 2055 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) 2056 { 2057 struct net *net = dev_net(dev); 2058 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2059 2060 if (dev != ip6n->fb_tnl_dev) 2061 unregister_netdevice_queue(dev, head); 2062 } 2063 2064 static size_t ip6_tnl_get_size(const struct net_device *dev) 2065 { 2066 return 2067 /* IFLA_IPTUN_LINK */ 2068 nla_total_size(4) + 2069 /* IFLA_IPTUN_LOCAL */ 2070 nla_total_size(sizeof(struct in6_addr)) + 2071 /* IFLA_IPTUN_REMOTE */ 2072 nla_total_size(sizeof(struct in6_addr)) + 2073 /* IFLA_IPTUN_TTL */ 2074 nla_total_size(1) + 2075 /* IFLA_IPTUN_ENCAP_LIMIT */ 2076 nla_total_size(1) + 2077 /* IFLA_IPTUN_FLOWINFO */ 2078 nla_total_size(4) + 2079 /* IFLA_IPTUN_FLAGS */ 2080 nla_total_size(4) + 2081 /* IFLA_IPTUN_PROTO */ 2082 nla_total_size(1) + 2083 /* IFLA_IPTUN_ENCAP_TYPE */ 2084 nla_total_size(2) + 2085 /* IFLA_IPTUN_ENCAP_FLAGS */ 2086 nla_total_size(2) + 2087 /* IFLA_IPTUN_ENCAP_SPORT */ 2088 nla_total_size(2) + 2089 /* IFLA_IPTUN_ENCAP_DPORT */ 2090 nla_total_size(2) + 2091 /* IFLA_IPTUN_COLLECT_METADATA */ 2092 nla_total_size(0) + 2093 /* IFLA_IPTUN_FWMARK */ 2094 nla_total_size(4) + 2095 0; 2096 } 2097 2098 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) 2099 { 2100 struct ip6_tnl *tunnel = netdev_priv(dev); 2101 struct __ip6_tnl_parm *parm = &tunnel->parms; 2102 2103 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 2104 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || 2105 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || 2106 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || 2107 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || 2108 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || 2109 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || 2110 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) || 2111 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark)) 2112 goto nla_put_failure; 2113 2114 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || 2115 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) || 2116 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || 2117 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) 2118 goto nla_put_failure; 2119 2120 if (parm->collect_md) 2121 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) 2122 goto nla_put_failure; 2123 2124 return 0; 2125 2126 nla_put_failure: 2127 return -EMSGSIZE; 2128 } 2129 2130 struct net *ip6_tnl_get_link_net(const struct net_device *dev) 2131 { 2132 struct ip6_tnl *tunnel = netdev_priv(dev); 2133 2134 return tunnel->net; 2135 } 2136 EXPORT_SYMBOL(ip6_tnl_get_link_net); 2137 2138 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { 2139 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 2140 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, 2141 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, 2142 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 2143 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, 2144 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, 2145 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, 2146 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 2147 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 2148 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 2149 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 2150 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 2151 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, 2152 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 2153 }; 2154 2155 static struct rtnl_link_ops ip6_link_ops __read_mostly = { 2156 .kind = "ip6tnl", 2157 .maxtype = IFLA_IPTUN_MAX, 2158 .policy = ip6_tnl_policy, 2159 .priv_size = sizeof(struct ip6_tnl), 2160 .setup = ip6_tnl_dev_setup, 2161 .validate = ip6_tnl_validate, 2162 .newlink = ip6_tnl_newlink, 2163 .changelink = ip6_tnl_changelink, 2164 .dellink = ip6_tnl_dellink, 2165 .get_size = ip6_tnl_get_size, 2166 .fill_info = ip6_tnl_fill_info, 2167 .get_link_net = ip6_tnl_get_link_net, 2168 }; 2169 2170 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { 2171 .handler = ip4ip6_rcv, 2172 .err_handler = ip4ip6_err, 2173 .priority = 1, 2174 }; 2175 2176 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { 2177 .handler = ip6ip6_rcv, 2178 .err_handler = ip6ip6_err, 2179 .priority = 1, 2180 }; 2181 2182 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list) 2183 { 2184 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2185 struct net_device *dev, *aux; 2186 int h; 2187 struct ip6_tnl *t; 2188 2189 for_each_netdev_safe(net, dev, aux) 2190 if (dev->rtnl_link_ops == &ip6_link_ops) 2191 unregister_netdevice_queue(dev, list); 2192 2193 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) { 2194 t = rtnl_dereference(ip6n->tnls_r_l[h]); 2195 while (t) { 2196 /* If dev is in the same netns, it has already 2197 * been added to the list by the previous loop. 2198 */ 2199 if (!net_eq(dev_net(t->dev), net)) 2200 unregister_netdevice_queue(t->dev, list); 2201 t = rtnl_dereference(t->next); 2202 } 2203 } 2204 } 2205 2206 static int __net_init ip6_tnl_init_net(struct net *net) 2207 { 2208 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2209 struct ip6_tnl *t = NULL; 2210 int err; 2211 2212 ip6n->tnls[0] = ip6n->tnls_wc; 2213 ip6n->tnls[1] = ip6n->tnls_r_l; 2214 2215 if (!net_has_fallback_tunnels(net)) 2216 return 0; 2217 err = -ENOMEM; 2218 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", 2219 NET_NAME_UNKNOWN, ip6_tnl_dev_setup); 2220 2221 if (!ip6n->fb_tnl_dev) 2222 goto err_alloc_dev; 2223 dev_net_set(ip6n->fb_tnl_dev, net); 2224 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; 2225 /* FB netdevice is special: we have one, and only one per netns. 2226 * Allowing to move it to another netns is clearly unsafe. 2227 */ 2228 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; 2229 2230 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); 2231 if (err < 0) 2232 goto err_register; 2233 2234 err = register_netdev(ip6n->fb_tnl_dev); 2235 if (err < 0) 2236 goto err_register; 2237 2238 t = netdev_priv(ip6n->fb_tnl_dev); 2239 2240 strcpy(t->parms.name, ip6n->fb_tnl_dev->name); 2241 return 0; 2242 2243 err_register: 2244 free_netdev(ip6n->fb_tnl_dev); 2245 err_alloc_dev: 2246 return err; 2247 } 2248 2249 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list) 2250 { 2251 struct net *net; 2252 LIST_HEAD(list); 2253 2254 rtnl_lock(); 2255 list_for_each_entry(net, net_list, exit_list) 2256 ip6_tnl_destroy_tunnels(net, &list); 2257 unregister_netdevice_many(&list); 2258 rtnl_unlock(); 2259 } 2260 2261 static struct pernet_operations ip6_tnl_net_ops = { 2262 .init = ip6_tnl_init_net, 2263 .exit_batch = ip6_tnl_exit_batch_net, 2264 .id = &ip6_tnl_net_id, 2265 .size = sizeof(struct ip6_tnl_net), 2266 }; 2267 2268 /** 2269 * ip6_tunnel_init - register protocol and reserve needed resources 2270 * 2271 * Return: 0 on success 2272 **/ 2273 2274 static int __init ip6_tunnel_init(void) 2275 { 2276 int err; 2277 2278 if (!ipv6_mod_enabled()) 2279 return -EOPNOTSUPP; 2280 2281 err = register_pernet_device(&ip6_tnl_net_ops); 2282 if (err < 0) 2283 goto out_pernet; 2284 2285 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); 2286 if (err < 0) { 2287 pr_err("%s: can't register ip4ip6\n", __func__); 2288 goto out_ip4ip6; 2289 } 2290 2291 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); 2292 if (err < 0) { 2293 pr_err("%s: can't register ip6ip6\n", __func__); 2294 goto out_ip6ip6; 2295 } 2296 err = rtnl_link_register(&ip6_link_ops); 2297 if (err < 0) 2298 goto rtnl_link_failed; 2299 2300 return 0; 2301 2302 rtnl_link_failed: 2303 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); 2304 out_ip6ip6: 2305 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); 2306 out_ip4ip6: 2307 unregister_pernet_device(&ip6_tnl_net_ops); 2308 out_pernet: 2309 return err; 2310 } 2311 2312 /** 2313 * ip6_tunnel_cleanup - free resources and unregister protocol 2314 **/ 2315 2316 static void __exit ip6_tunnel_cleanup(void) 2317 { 2318 rtnl_link_unregister(&ip6_link_ops); 2319 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) 2320 pr_info("%s: can't deregister ip4ip6\n", __func__); 2321 2322 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) 2323 pr_info("%s: can't deregister ip6ip6\n", __func__); 2324 2325 unregister_pernet_device(&ip6_tnl_net_ops); 2326 } 2327 2328 module_init(ip6_tunnel_init); 2329 module_exit(ip6_tunnel_cleanup); 2330