1 /* 2 * IPv6 tunneling device 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Ville Nuorvala <vnuorval@tcs.hut.fi> 7 * Yasuyuki Kozakai <kozakai@linux-ipv6.org> 8 * 9 * Based on: 10 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c 11 * 12 * RFC 2473 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * as published by the Free Software Foundation; either version 17 * 2 of the License, or (at your option) any later version. 18 * 19 */ 20 21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 22 23 #include <linux/module.h> 24 #include <linux/capability.h> 25 #include <linux/errno.h> 26 #include <linux/types.h> 27 #include <linux/sockios.h> 28 #include <linux/icmp.h> 29 #include <linux/if.h> 30 #include <linux/in.h> 31 #include <linux/ip.h> 32 #include <linux/net.h> 33 #include <linux/in6.h> 34 #include <linux/netdevice.h> 35 #include <linux/if_arp.h> 36 #include <linux/icmpv6.h> 37 #include <linux/init.h> 38 #include <linux/route.h> 39 #include <linux/rtnetlink.h> 40 #include <linux/netfilter_ipv6.h> 41 #include <linux/slab.h> 42 #include <linux/hash.h> 43 #include <linux/etherdevice.h> 44 45 #include <linux/uaccess.h> 46 #include <linux/atomic.h> 47 48 #include <net/icmp.h> 49 #include <net/ip.h> 50 #include <net/ip_tunnels.h> 51 #include <net/ipv6.h> 52 #include <net/ip6_route.h> 53 #include <net/addrconf.h> 54 #include <net/ip6_tunnel.h> 55 #include <net/xfrm.h> 56 #include <net/dsfield.h> 57 #include <net/inet_ecn.h> 58 #include <net/net_namespace.h> 59 #include <net/netns/generic.h> 60 #include <net/dst_metadata.h> 61 62 MODULE_AUTHOR("Ville Nuorvala"); 63 MODULE_DESCRIPTION("IPv6 tunneling device"); 64 MODULE_LICENSE("GPL"); 65 MODULE_ALIAS_RTNL_LINK("ip6tnl"); 66 MODULE_ALIAS_NETDEV("ip6tnl0"); 67 68 #define IP6_TUNNEL_HASH_SIZE_SHIFT 5 69 #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT) 70 71 static bool log_ecn_error = true; 72 module_param(log_ecn_error, bool, 0644); 73 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 74 75 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) 76 { 77 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); 78 79 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT); 80 } 81 82 static int ip6_tnl_dev_init(struct net_device *dev); 83 static void ip6_tnl_dev_setup(struct net_device *dev); 84 static struct rtnl_link_ops ip6_link_ops __read_mostly; 85 86 static unsigned int ip6_tnl_net_id __read_mostly; 87 struct ip6_tnl_net { 88 /* the IPv6 tunnel fallback device */ 89 struct net_device *fb_tnl_dev; 90 /* lists for storing tunnels in use */ 91 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE]; 92 struct ip6_tnl __rcu *tnls_wc[1]; 93 struct ip6_tnl __rcu **tnls[2]; 94 struct ip6_tnl __rcu *collect_md_tun; 95 }; 96 97 static struct net_device_stats *ip6_get_stats(struct net_device *dev) 98 { 99 struct pcpu_sw_netstats tmp, sum = { 0 }; 100 int i; 101 102 for_each_possible_cpu(i) { 103 unsigned int start; 104 const struct pcpu_sw_netstats *tstats = 105 per_cpu_ptr(dev->tstats, i); 106 107 do { 108 start = u64_stats_fetch_begin_irq(&tstats->syncp); 109 tmp.rx_packets = tstats->rx_packets; 110 tmp.rx_bytes = tstats->rx_bytes; 111 tmp.tx_packets = tstats->tx_packets; 112 tmp.tx_bytes = tstats->tx_bytes; 113 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start)); 114 115 sum.rx_packets += tmp.rx_packets; 116 sum.rx_bytes += tmp.rx_bytes; 117 sum.tx_packets += tmp.tx_packets; 118 sum.tx_bytes += tmp.tx_bytes; 119 } 120 dev->stats.rx_packets = sum.rx_packets; 121 dev->stats.rx_bytes = sum.rx_bytes; 122 dev->stats.tx_packets = sum.tx_packets; 123 dev->stats.tx_bytes = sum.tx_bytes; 124 return &dev->stats; 125 } 126 127 /** 128 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses 129 * @remote: the address of the tunnel exit-point 130 * @local: the address of the tunnel entry-point 131 * 132 * Return: 133 * tunnel matching given end-points if found, 134 * else fallback tunnel if its device is up, 135 * else %NULL 136 **/ 137 138 #define for_each_ip6_tunnel_rcu(start) \ 139 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) 140 141 static struct ip6_tnl * 142 ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local) 143 { 144 unsigned int hash = HASH(remote, local); 145 struct ip6_tnl *t; 146 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 147 struct in6_addr any; 148 149 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 150 if (ipv6_addr_equal(local, &t->parms.laddr) && 151 ipv6_addr_equal(remote, &t->parms.raddr) && 152 (t->dev->flags & IFF_UP)) 153 return t; 154 } 155 156 memset(&any, 0, sizeof(any)); 157 hash = HASH(&any, local); 158 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 159 if (ipv6_addr_equal(local, &t->parms.laddr) && 160 ipv6_addr_any(&t->parms.raddr) && 161 (t->dev->flags & IFF_UP)) 162 return t; 163 } 164 165 hash = HASH(remote, &any); 166 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 167 if (ipv6_addr_equal(remote, &t->parms.raddr) && 168 ipv6_addr_any(&t->parms.laddr) && 169 (t->dev->flags & IFF_UP)) 170 return t; 171 } 172 173 t = rcu_dereference(ip6n->collect_md_tun); 174 if (t && t->dev->flags & IFF_UP) 175 return t; 176 177 t = rcu_dereference(ip6n->tnls_wc[0]); 178 if (t && (t->dev->flags & IFF_UP)) 179 return t; 180 181 return NULL; 182 } 183 184 /** 185 * ip6_tnl_bucket - get head of list matching given tunnel parameters 186 * @p: parameters containing tunnel end-points 187 * 188 * Description: 189 * ip6_tnl_bucket() returns the head of the list matching the 190 * &struct in6_addr entries laddr and raddr in @p. 191 * 192 * Return: head of IPv6 tunnel list 193 **/ 194 195 static struct ip6_tnl __rcu ** 196 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) 197 { 198 const struct in6_addr *remote = &p->raddr; 199 const struct in6_addr *local = &p->laddr; 200 unsigned int h = 0; 201 int prio = 0; 202 203 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { 204 prio = 1; 205 h = HASH(remote, local); 206 } 207 return &ip6n->tnls[prio][h]; 208 } 209 210 /** 211 * ip6_tnl_link - add tunnel to hash table 212 * @t: tunnel to be added 213 **/ 214 215 static void 216 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 217 { 218 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); 219 220 if (t->parms.collect_md) 221 rcu_assign_pointer(ip6n->collect_md_tun, t); 222 rcu_assign_pointer(t->next , rtnl_dereference(*tp)); 223 rcu_assign_pointer(*tp, t); 224 } 225 226 /** 227 * ip6_tnl_unlink - remove tunnel from hash table 228 * @t: tunnel to be removed 229 **/ 230 231 static void 232 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 233 { 234 struct ip6_tnl __rcu **tp; 235 struct ip6_tnl *iter; 236 237 if (t->parms.collect_md) 238 rcu_assign_pointer(ip6n->collect_md_tun, NULL); 239 240 for (tp = ip6_tnl_bucket(ip6n, &t->parms); 241 (iter = rtnl_dereference(*tp)) != NULL; 242 tp = &iter->next) { 243 if (t == iter) { 244 rcu_assign_pointer(*tp, t->next); 245 break; 246 } 247 } 248 } 249 250 static void ip6_dev_free(struct net_device *dev) 251 { 252 struct ip6_tnl *t = netdev_priv(dev); 253 254 gro_cells_destroy(&t->gro_cells); 255 dst_cache_destroy(&t->dst_cache); 256 free_percpu(dev->tstats); 257 } 258 259 static int ip6_tnl_create2(struct net_device *dev) 260 { 261 struct ip6_tnl *t = netdev_priv(dev); 262 struct net *net = dev_net(dev); 263 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 264 int err; 265 266 t = netdev_priv(dev); 267 268 dev->rtnl_link_ops = &ip6_link_ops; 269 err = register_netdevice(dev); 270 if (err < 0) 271 goto out; 272 273 strcpy(t->parms.name, dev->name); 274 275 dev_hold(dev); 276 ip6_tnl_link(ip6n, t); 277 return 0; 278 279 out: 280 return err; 281 } 282 283 /** 284 * ip6_tnl_create - create a new tunnel 285 * @p: tunnel parameters 286 * @pt: pointer to new tunnel 287 * 288 * Description: 289 * Create tunnel matching given parameters. 290 * 291 * Return: 292 * created tunnel or error pointer 293 **/ 294 295 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) 296 { 297 struct net_device *dev; 298 struct ip6_tnl *t; 299 char name[IFNAMSIZ]; 300 int err = -ENOMEM; 301 302 if (p->name[0]) 303 strlcpy(name, p->name, IFNAMSIZ); 304 else 305 sprintf(name, "ip6tnl%%d"); 306 307 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 308 ip6_tnl_dev_setup); 309 if (!dev) 310 goto failed; 311 312 dev_net_set(dev, net); 313 314 t = netdev_priv(dev); 315 t->parms = *p; 316 t->net = dev_net(dev); 317 err = ip6_tnl_create2(dev); 318 if (err < 0) 319 goto failed_free; 320 321 return t; 322 323 failed_free: 324 free_netdev(dev); 325 failed: 326 return ERR_PTR(err); 327 } 328 329 /** 330 * ip6_tnl_locate - find or create tunnel matching given parameters 331 * @p: tunnel parameters 332 * @create: != 0 if allowed to create new tunnel if no match found 333 * 334 * Description: 335 * ip6_tnl_locate() first tries to locate an existing tunnel 336 * based on @parms. If this is unsuccessful, but @create is set a new 337 * tunnel device is created and registered for use. 338 * 339 * Return: 340 * matching tunnel or error pointer 341 **/ 342 343 static struct ip6_tnl *ip6_tnl_locate(struct net *net, 344 struct __ip6_tnl_parm *p, int create) 345 { 346 const struct in6_addr *remote = &p->raddr; 347 const struct in6_addr *local = &p->laddr; 348 struct ip6_tnl __rcu **tp; 349 struct ip6_tnl *t; 350 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 351 352 for (tp = ip6_tnl_bucket(ip6n, p); 353 (t = rtnl_dereference(*tp)) != NULL; 354 tp = &t->next) { 355 if (ipv6_addr_equal(local, &t->parms.laddr) && 356 ipv6_addr_equal(remote, &t->parms.raddr)) { 357 if (create) 358 return ERR_PTR(-EEXIST); 359 360 return t; 361 } 362 } 363 if (!create) 364 return ERR_PTR(-ENODEV); 365 return ip6_tnl_create(net, p); 366 } 367 368 /** 369 * ip6_tnl_dev_uninit - tunnel device uninitializer 370 * @dev: the device to be destroyed 371 * 372 * Description: 373 * ip6_tnl_dev_uninit() removes tunnel from its list 374 **/ 375 376 static void 377 ip6_tnl_dev_uninit(struct net_device *dev) 378 { 379 struct ip6_tnl *t = netdev_priv(dev); 380 struct net *net = t->net; 381 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 382 383 if (dev == ip6n->fb_tnl_dev) 384 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); 385 else 386 ip6_tnl_unlink(ip6n, t); 387 dst_cache_reset(&t->dst_cache); 388 dev_put(dev); 389 } 390 391 /** 392 * parse_tvl_tnl_enc_lim - handle encapsulation limit option 393 * @skb: received socket buffer 394 * 395 * Return: 396 * 0 if none was found, 397 * else index to encapsulation limit 398 **/ 399 400 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) 401 { 402 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw; 403 unsigned int nhoff = raw - skb->data; 404 unsigned int off = nhoff + sizeof(*ipv6h); 405 u8 next, nexthdr = ipv6h->nexthdr; 406 407 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { 408 struct ipv6_opt_hdr *hdr; 409 u16 optlen; 410 411 if (!pskb_may_pull(skb, off + sizeof(*hdr))) 412 break; 413 414 hdr = (struct ipv6_opt_hdr *)(skb->data + off); 415 if (nexthdr == NEXTHDR_FRAGMENT) { 416 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; 417 if (frag_hdr->frag_off) 418 break; 419 optlen = 8; 420 } else if (nexthdr == NEXTHDR_AUTH) { 421 optlen = (hdr->hdrlen + 2) << 2; 422 } else { 423 optlen = ipv6_optlen(hdr); 424 } 425 /* cache hdr->nexthdr, since pskb_may_pull() might 426 * invalidate hdr 427 */ 428 next = hdr->nexthdr; 429 if (nexthdr == NEXTHDR_DEST) { 430 u16 i = 2; 431 432 /* Remember : hdr is no longer valid at this point. */ 433 if (!pskb_may_pull(skb, off + optlen)) 434 break; 435 436 while (1) { 437 struct ipv6_tlv_tnl_enc_lim *tel; 438 439 /* No more room for encapsulation limit */ 440 if (i + sizeof(*tel) > optlen) 441 break; 442 443 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i); 444 /* return index of option if found and valid */ 445 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && 446 tel->length == 1) 447 return i + off - nhoff; 448 /* else jump to next option */ 449 if (tel->type) 450 i += tel->length + 2; 451 else 452 i++; 453 } 454 } 455 nexthdr = next; 456 off += optlen; 457 } 458 return 0; 459 } 460 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); 461 462 /** 463 * ip6_tnl_err - tunnel error handler 464 * 465 * Description: 466 * ip6_tnl_err() should handle errors in the tunnel according 467 * to the specifications in RFC 2473. 468 **/ 469 470 static int 471 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, 472 u8 *type, u8 *code, int *msg, __u32 *info, int offset) 473 { 474 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; 475 struct net *net = dev_net(skb->dev); 476 u8 rel_type = ICMPV6_DEST_UNREACH; 477 u8 rel_code = ICMPV6_ADDR_UNREACH; 478 __u32 rel_info = 0; 479 struct ip6_tnl *t; 480 int err = -ENOENT; 481 int rel_msg = 0; 482 u8 tproto; 483 __u16 len; 484 485 /* If the packet doesn't contain the original IPv6 header we are 486 in trouble since we might need the source address for further 487 processing of the error. */ 488 489 rcu_read_lock(); 490 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr); 491 if (!t) 492 goto out; 493 494 tproto = READ_ONCE(t->parms.proto); 495 if (tproto != ipproto && tproto != 0) 496 goto out; 497 498 err = 0; 499 500 switch (*type) { 501 struct ipv6_tlv_tnl_enc_lim *tel; 502 __u32 mtu, teli; 503 case ICMPV6_DEST_UNREACH: 504 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 505 t->parms.name); 506 rel_msg = 1; 507 break; 508 case ICMPV6_TIME_EXCEED: 509 if ((*code) == ICMPV6_EXC_HOPLIMIT) { 510 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 511 t->parms.name); 512 rel_msg = 1; 513 } 514 break; 515 case ICMPV6_PARAMPROB: 516 teli = 0; 517 if ((*code) == ICMPV6_HDR_FIELD) 518 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 519 520 if (teli && teli == *info - 2) { 521 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 522 if (tel->encap_limit == 0) { 523 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 524 t->parms.name); 525 rel_msg = 1; 526 } 527 } else { 528 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 529 t->parms.name); 530 } 531 break; 532 case ICMPV6_PKT_TOOBIG: 533 ip6_update_pmtu(skb, net, htonl(*info), 0, 0, 534 sock_net_uid(net, NULL)); 535 mtu = *info - offset; 536 if (mtu < IPV6_MIN_MTU) 537 mtu = IPV6_MIN_MTU; 538 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); 539 if (len > mtu) { 540 rel_type = ICMPV6_PKT_TOOBIG; 541 rel_code = 0; 542 rel_info = mtu; 543 rel_msg = 1; 544 } 545 break; 546 case NDISC_REDIRECT: 547 ip6_redirect(skb, net, skb->dev->ifindex, 0, 548 sock_net_uid(net, NULL)); 549 break; 550 } 551 552 *type = rel_type; 553 *code = rel_code; 554 *info = rel_info; 555 *msg = rel_msg; 556 557 out: 558 rcu_read_unlock(); 559 return err; 560 } 561 562 static int 563 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 564 u8 type, u8 code, int offset, __be32 info) 565 { 566 __u32 rel_info = ntohl(info); 567 const struct iphdr *eiph; 568 struct sk_buff *skb2; 569 int err, rel_msg = 0; 570 u8 rel_type = type; 571 u8 rel_code = code; 572 struct rtable *rt; 573 struct flowi4 fl4; 574 575 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, 576 &rel_msg, &rel_info, offset); 577 if (err < 0) 578 return err; 579 580 if (rel_msg == 0) 581 return 0; 582 583 switch (rel_type) { 584 case ICMPV6_DEST_UNREACH: 585 if (rel_code != ICMPV6_ADDR_UNREACH) 586 return 0; 587 rel_type = ICMP_DEST_UNREACH; 588 rel_code = ICMP_HOST_UNREACH; 589 break; 590 case ICMPV6_PKT_TOOBIG: 591 if (rel_code != 0) 592 return 0; 593 rel_type = ICMP_DEST_UNREACH; 594 rel_code = ICMP_FRAG_NEEDED; 595 break; 596 default: 597 return 0; 598 } 599 600 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) 601 return 0; 602 603 skb2 = skb_clone(skb, GFP_ATOMIC); 604 if (!skb2) 605 return 0; 606 607 skb_dst_drop(skb2); 608 609 skb_pull(skb2, offset); 610 skb_reset_network_header(skb2); 611 eiph = ip_hdr(skb2); 612 613 /* Try to guess incoming interface */ 614 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr, 615 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 616 if (IS_ERR(rt)) 617 goto out; 618 619 skb2->dev = rt->dst.dev; 620 ip_rt_put(rt); 621 622 /* route "incoming" packet */ 623 if (rt->rt_flags & RTCF_LOCAL) { 624 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, 625 eiph->daddr, eiph->saddr, 0, 0, 626 IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 627 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL) { 628 if (!IS_ERR(rt)) 629 ip_rt_put(rt); 630 goto out; 631 } 632 skb_dst_set(skb2, &rt->dst); 633 } else { 634 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, 635 skb2->dev) || 636 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) 637 goto out; 638 } 639 640 /* change mtu on this route */ 641 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { 642 if (rel_info > dst_mtu(skb_dst(skb2))) 643 goto out; 644 645 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), NULL, skb2, 646 rel_info); 647 } 648 649 icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); 650 651 out: 652 kfree_skb(skb2); 653 return 0; 654 } 655 656 static int 657 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 658 u8 type, u8 code, int offset, __be32 info) 659 { 660 __u32 rel_info = ntohl(info); 661 int err, rel_msg = 0; 662 u8 rel_type = type; 663 u8 rel_code = code; 664 665 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, 666 &rel_msg, &rel_info, offset); 667 if (err < 0) 668 return err; 669 670 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { 671 struct rt6_info *rt; 672 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 673 674 if (!skb2) 675 return 0; 676 677 skb_dst_drop(skb2); 678 skb_pull(skb2, offset); 679 skb_reset_network_header(skb2); 680 681 /* Try to guess incoming interface */ 682 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, 683 NULL, 0, 0); 684 685 if (rt && rt->dst.dev) 686 skb2->dev = rt->dst.dev; 687 688 icmpv6_send(skb2, rel_type, rel_code, rel_info); 689 690 ip6_rt_put(rt); 691 692 kfree_skb(skb2); 693 } 694 695 return 0; 696 } 697 698 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 699 const struct ipv6hdr *ipv6h, 700 struct sk_buff *skb) 701 { 702 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; 703 704 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 705 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); 706 707 return IP6_ECN_decapsulate(ipv6h, skb); 708 } 709 710 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 711 const struct ipv6hdr *ipv6h, 712 struct sk_buff *skb) 713 { 714 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 715 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); 716 717 return IP6_ECN_decapsulate(ipv6h, skb); 718 } 719 720 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, 721 const struct in6_addr *laddr, 722 const struct in6_addr *raddr) 723 { 724 struct __ip6_tnl_parm *p = &t->parms; 725 int ltype = ipv6_addr_type(laddr); 726 int rtype = ipv6_addr_type(raddr); 727 __u32 flags = 0; 728 729 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { 730 flags = IP6_TNL_F_CAP_PER_PACKET; 731 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 732 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 733 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && 734 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { 735 if (ltype&IPV6_ADDR_UNICAST) 736 flags |= IP6_TNL_F_CAP_XMIT; 737 if (rtype&IPV6_ADDR_UNICAST) 738 flags |= IP6_TNL_F_CAP_RCV; 739 } 740 return flags; 741 } 742 EXPORT_SYMBOL(ip6_tnl_get_cap); 743 744 /* called with rcu_read_lock() */ 745 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, 746 const struct in6_addr *laddr, 747 const struct in6_addr *raddr) 748 { 749 struct __ip6_tnl_parm *p = &t->parms; 750 int ret = 0; 751 struct net *net = t->net; 752 753 if ((p->flags & IP6_TNL_F_CAP_RCV) || 754 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 755 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { 756 struct net_device *ldev = NULL; 757 758 if (p->link) 759 ldev = dev_get_by_index_rcu(net, p->link); 760 761 if ((ipv6_addr_is_multicast(laddr) || 762 likely(ipv6_chk_addr(net, laddr, ldev, 0))) && 763 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) || 764 likely(!ipv6_chk_addr(net, raddr, NULL, 0)))) 765 ret = 1; 766 } 767 return ret; 768 } 769 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); 770 771 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 772 const struct tnl_ptk_info *tpi, 773 struct metadata_dst *tun_dst, 774 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 775 const struct ipv6hdr *ipv6h, 776 struct sk_buff *skb), 777 bool log_ecn_err) 778 { 779 struct pcpu_sw_netstats *tstats; 780 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 781 int err; 782 783 if ((!(tpi->flags & TUNNEL_CSUM) && 784 (tunnel->parms.i_flags & TUNNEL_CSUM)) || 785 ((tpi->flags & TUNNEL_CSUM) && 786 !(tunnel->parms.i_flags & TUNNEL_CSUM))) { 787 tunnel->dev->stats.rx_crc_errors++; 788 tunnel->dev->stats.rx_errors++; 789 goto drop; 790 } 791 792 if (tunnel->parms.i_flags & TUNNEL_SEQ) { 793 if (!(tpi->flags & TUNNEL_SEQ) || 794 (tunnel->i_seqno && 795 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { 796 tunnel->dev->stats.rx_fifo_errors++; 797 tunnel->dev->stats.rx_errors++; 798 goto drop; 799 } 800 tunnel->i_seqno = ntohl(tpi->seq) + 1; 801 } 802 803 skb->protocol = tpi->proto; 804 805 /* Warning: All skb pointers will be invalidated! */ 806 if (tunnel->dev->type == ARPHRD_ETHER) { 807 if (!pskb_may_pull(skb, ETH_HLEN)) { 808 tunnel->dev->stats.rx_length_errors++; 809 tunnel->dev->stats.rx_errors++; 810 goto drop; 811 } 812 813 ipv6h = ipv6_hdr(skb); 814 skb->protocol = eth_type_trans(skb, tunnel->dev); 815 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 816 } else { 817 skb->dev = tunnel->dev; 818 } 819 820 skb_reset_network_header(skb); 821 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 822 823 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); 824 825 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); 826 if (unlikely(err)) { 827 if (log_ecn_err) 828 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", 829 &ipv6h->saddr, 830 ipv6_get_dsfield(ipv6h)); 831 if (err > 1) { 832 ++tunnel->dev->stats.rx_frame_errors; 833 ++tunnel->dev->stats.rx_errors; 834 goto drop; 835 } 836 } 837 838 tstats = this_cpu_ptr(tunnel->dev->tstats); 839 u64_stats_update_begin(&tstats->syncp); 840 tstats->rx_packets++; 841 tstats->rx_bytes += skb->len; 842 u64_stats_update_end(&tstats->syncp); 843 844 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); 845 846 if (tun_dst) 847 skb_dst_set(skb, (struct dst_entry *)tun_dst); 848 849 gro_cells_receive(&tunnel->gro_cells, skb); 850 return 0; 851 852 drop: 853 if (tun_dst) 854 dst_release((struct dst_entry *)tun_dst); 855 kfree_skb(skb); 856 return 0; 857 } 858 859 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, 860 const struct tnl_ptk_info *tpi, 861 struct metadata_dst *tun_dst, 862 bool log_ecn_err) 863 { 864 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, ip6ip6_dscp_ecn_decapsulate, 865 log_ecn_err); 866 } 867 EXPORT_SYMBOL(ip6_tnl_rcv); 868 869 static const struct tnl_ptk_info tpi_v6 = { 870 /* no tunnel info required for ipxip6. */ 871 .proto = htons(ETH_P_IPV6), 872 }; 873 874 static const struct tnl_ptk_info tpi_v4 = { 875 /* no tunnel info required for ipxip6. */ 876 .proto = htons(ETH_P_IP), 877 }; 878 879 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, 880 const struct tnl_ptk_info *tpi, 881 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 882 const struct ipv6hdr *ipv6h, 883 struct sk_buff *skb)) 884 { 885 struct ip6_tnl *t; 886 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 887 struct metadata_dst *tun_dst = NULL; 888 int ret = -1; 889 890 rcu_read_lock(); 891 t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr); 892 893 if (t) { 894 u8 tproto = READ_ONCE(t->parms.proto); 895 896 if (tproto != ipproto && tproto != 0) 897 goto drop; 898 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 899 goto drop; 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(net, laddr, ldev, 0))) 995 pr_warn("%s xmit: Local address not yet configured!\n", 996 p->name); 997 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) && 998 !ipv6_addr_is_multicast(raddr) && 999 unlikely(ipv6_chk_addr(net, raddr, NULL, 0))) 1000 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", 1001 p->name); 1002 else 1003 ret = 1; 1004 rcu_read_unlock(); 1005 } 1006 return ret; 1007 } 1008 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); 1009 1010 /** 1011 * ip6_tnl_xmit - encapsulate packet and send 1012 * @skb: the outgoing socket buffer 1013 * @dev: the outgoing tunnel device 1014 * @dsfield: dscp code for outer header 1015 * @fl6: flow of tunneled packet 1016 * @encap_limit: encapsulation limit 1017 * @pmtu: Path MTU is stored if packet is too big 1018 * @proto: next header value 1019 * 1020 * Description: 1021 * Build new header and do some sanity checks on the packet before sending 1022 * it. 1023 * 1024 * Return: 1025 * 0 on success 1026 * -1 fail 1027 * %-EMSGSIZE message too big. return mtu in this case. 1028 **/ 1029 1030 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 1031 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, 1032 __u8 proto) 1033 { 1034 struct ip6_tnl *t = netdev_priv(dev); 1035 struct net *net = t->net; 1036 struct net_device_stats *stats = &t->dev->stats; 1037 struct ipv6hdr *ipv6h; 1038 struct ipv6_tel_txoption opt; 1039 struct dst_entry *dst = NULL, *ndst = NULL; 1040 struct net_device *tdev; 1041 int mtu; 1042 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0; 1043 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; 1044 unsigned int max_headroom = psh_hlen; 1045 bool use_cache = false; 1046 u8 hop_limit; 1047 int err = -1; 1048 1049 if (t->parms.collect_md) { 1050 hop_limit = skb_tunnel_info(skb)->key.ttl; 1051 goto route_lookup; 1052 } else { 1053 hop_limit = t->parms.hop_limit; 1054 } 1055 1056 /* NBMA tunnel */ 1057 if (ipv6_addr_any(&t->parms.raddr)) { 1058 if (skb->protocol == htons(ETH_P_IPV6)) { 1059 struct in6_addr *addr6; 1060 struct neighbour *neigh; 1061 int addr_type; 1062 1063 if (!skb_dst(skb)) 1064 goto tx_err_link_failure; 1065 1066 neigh = dst_neigh_lookup(skb_dst(skb), 1067 &ipv6_hdr(skb)->daddr); 1068 if (!neigh) 1069 goto tx_err_link_failure; 1070 1071 addr6 = (struct in6_addr *)&neigh->primary_key; 1072 addr_type = ipv6_addr_type(addr6); 1073 1074 if (addr_type == IPV6_ADDR_ANY) 1075 addr6 = &ipv6_hdr(skb)->daddr; 1076 1077 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); 1078 neigh_release(neigh); 1079 } 1080 } else if (!(t->parms.flags & 1081 (IP6_TNL_F_USE_ORIG_TCLASS | IP6_TNL_F_USE_ORIG_FWMARK))) { 1082 /* enable the cache only only if the routing decision does 1083 * not depend on the current inner header value 1084 */ 1085 use_cache = true; 1086 } 1087 1088 if (use_cache) 1089 dst = dst_cache_get(&t->dst_cache); 1090 1091 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) 1092 goto tx_err_link_failure; 1093 1094 if (!dst) { 1095 route_lookup: 1096 /* add dsfield to flowlabel for route lookup */ 1097 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel); 1098 1099 dst = ip6_route_output(net, NULL, fl6); 1100 1101 if (dst->error) 1102 goto tx_err_link_failure; 1103 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); 1104 if (IS_ERR(dst)) { 1105 err = PTR_ERR(dst); 1106 dst = NULL; 1107 goto tx_err_link_failure; 1108 } 1109 if (t->parms.collect_md && 1110 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, 1111 &fl6->daddr, 0, &fl6->saddr)) 1112 goto tx_err_link_failure; 1113 ndst = dst; 1114 } 1115 1116 tdev = dst->dev; 1117 1118 if (tdev == dev) { 1119 stats->collisions++; 1120 net_warn_ratelimited("%s: Local routing loop detected!\n", 1121 t->parms.name); 1122 goto tx_err_dst_release; 1123 } 1124 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen; 1125 if (encap_limit >= 0) { 1126 max_headroom += 8; 1127 mtu -= 8; 1128 } 1129 if (skb->protocol == htons(ETH_P_IPV6)) { 1130 if (mtu < IPV6_MIN_MTU) 1131 mtu = IPV6_MIN_MTU; 1132 } else if (mtu < 576) { 1133 mtu = 576; 1134 } 1135 1136 if (skb_dst(skb) && !t->parms.collect_md) 1137 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); 1138 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) { 1139 *pmtu = mtu; 1140 err = -EMSGSIZE; 1141 goto tx_err_dst_release; 1142 } 1143 1144 if (t->err_count > 0) { 1145 if (time_before(jiffies, 1146 t->err_time + IP6TUNNEL_ERR_TIMEO)) { 1147 t->err_count--; 1148 1149 dst_link_failure(skb); 1150 } else { 1151 t->err_count = 0; 1152 } 1153 } 1154 1155 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); 1156 1157 /* 1158 * Okay, now see if we can stuff it in the buffer as-is. 1159 */ 1160 max_headroom += LL_RESERVED_SPACE(tdev); 1161 1162 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1163 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1164 struct sk_buff *new_skb; 1165 1166 new_skb = skb_realloc_headroom(skb, max_headroom); 1167 if (!new_skb) 1168 goto tx_err_dst_release; 1169 1170 if (skb->sk) 1171 skb_set_owner_w(new_skb, skb->sk); 1172 consume_skb(skb); 1173 skb = new_skb; 1174 } 1175 1176 if (t->parms.collect_md) { 1177 if (t->encap.type != TUNNEL_ENCAP_NONE) 1178 goto tx_err_dst_release; 1179 } else { 1180 if (use_cache && ndst) 1181 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); 1182 } 1183 skb_dst_set(skb, dst); 1184 1185 if (encap_limit >= 0) { 1186 init_tel_txopt(&opt, encap_limit); 1187 ipv6_push_frag_opts(skb, &opt.ops, &proto); 1188 } 1189 hop_limit = hop_limit ? : ip6_dst_hoplimit(dst); 1190 1191 /* Calculate max headroom for all the headers and adjust 1192 * needed_headroom if necessary. 1193 */ 1194 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) 1195 + dst->header_len + t->hlen; 1196 if (max_headroom > dev->needed_headroom) 1197 dev->needed_headroom = max_headroom; 1198 1199 err = ip6_tnl_encap(skb, t, &proto, fl6); 1200 if (err) 1201 return err; 1202 1203 skb_push(skb, sizeof(struct ipv6hdr)); 1204 skb_reset_network_header(skb); 1205 ipv6h = ipv6_hdr(skb); 1206 ip6_flow_hdr(ipv6h, dsfield, 1207 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); 1208 ipv6h->hop_limit = hop_limit; 1209 ipv6h->nexthdr = proto; 1210 ipv6h->saddr = fl6->saddr; 1211 ipv6h->daddr = fl6->daddr; 1212 ip6tunnel_xmit(NULL, skb, dev); 1213 return 0; 1214 tx_err_link_failure: 1215 stats->tx_carrier_errors++; 1216 dst_link_failure(skb); 1217 tx_err_dst_release: 1218 dst_release(dst); 1219 return err; 1220 } 1221 EXPORT_SYMBOL(ip6_tnl_xmit); 1222 1223 static inline int 1224 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1225 { 1226 struct ip6_tnl *t = netdev_priv(dev); 1227 const struct iphdr *iph = ip_hdr(skb); 1228 int encap_limit = -1; 1229 struct flowi6 fl6; 1230 __u8 dsfield; 1231 __u32 mtu; 1232 u8 tproto; 1233 int err; 1234 1235 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1236 1237 tproto = READ_ONCE(t->parms.proto); 1238 if (tproto != IPPROTO_IPIP && tproto != 0) 1239 return -1; 1240 1241 if (t->parms.collect_md) { 1242 struct ip_tunnel_info *tun_info; 1243 const struct ip_tunnel_key *key; 1244 1245 tun_info = skb_tunnel_info(skb); 1246 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1247 ip_tunnel_info_af(tun_info) != AF_INET6)) 1248 return -1; 1249 key = &tun_info->key; 1250 memset(&fl6, 0, sizeof(fl6)); 1251 fl6.flowi6_proto = IPPROTO_IPIP; 1252 fl6.daddr = key->u.ipv6.dst; 1253 fl6.flowlabel = key->label; 1254 dsfield = key->tos; 1255 } else { 1256 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1257 encap_limit = t->parms.encap_limit; 1258 1259 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1260 fl6.flowi6_proto = IPPROTO_IPIP; 1261 1262 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1263 dsfield = ipv4_get_dsfield(iph); 1264 else 1265 dsfield = ip6_tclass(t->parms.flowinfo); 1266 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1267 fl6.flowi6_mark = skb->mark; 1268 else 1269 fl6.flowi6_mark = t->parms.fwmark; 1270 } 1271 1272 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1273 1274 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1275 return -1; 1276 1277 dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph)); 1278 1279 skb_set_inner_ipproto(skb, IPPROTO_IPIP); 1280 1281 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1282 IPPROTO_IPIP); 1283 if (err != 0) { 1284 /* XXX: send ICMP error even if DF is not set. */ 1285 if (err == -EMSGSIZE) 1286 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 1287 htonl(mtu)); 1288 return -1; 1289 } 1290 1291 return 0; 1292 } 1293 1294 static inline int 1295 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1296 { 1297 struct ip6_tnl *t = netdev_priv(dev); 1298 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 1299 int encap_limit = -1; 1300 __u16 offset; 1301 struct flowi6 fl6; 1302 __u8 dsfield; 1303 __u32 mtu; 1304 u8 tproto; 1305 int err; 1306 1307 tproto = READ_ONCE(t->parms.proto); 1308 if ((tproto != IPPROTO_IPV6 && tproto != 0) || 1309 ip6_tnl_addr_conflict(t, ipv6h)) 1310 return -1; 1311 1312 if (t->parms.collect_md) { 1313 struct ip_tunnel_info *tun_info; 1314 const struct ip_tunnel_key *key; 1315 1316 tun_info = skb_tunnel_info(skb); 1317 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1318 ip_tunnel_info_af(tun_info) != AF_INET6)) 1319 return -1; 1320 key = &tun_info->key; 1321 memset(&fl6, 0, sizeof(fl6)); 1322 fl6.flowi6_proto = IPPROTO_IPV6; 1323 fl6.daddr = key->u.ipv6.dst; 1324 fl6.flowlabel = key->label; 1325 dsfield = key->tos; 1326 } else { 1327 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb)); 1328 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */ 1329 ipv6h = ipv6_hdr(skb); 1330 if (offset > 0) { 1331 struct ipv6_tlv_tnl_enc_lim *tel; 1332 1333 tel = (void *)&skb_network_header(skb)[offset]; 1334 if (tel->encap_limit == 0) { 1335 icmpv6_send(skb, ICMPV6_PARAMPROB, 1336 ICMPV6_HDR_FIELD, offset + 2); 1337 return -1; 1338 } 1339 encap_limit = tel->encap_limit - 1; 1340 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) { 1341 encap_limit = t->parms.encap_limit; 1342 } 1343 1344 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1345 fl6.flowi6_proto = IPPROTO_IPV6; 1346 1347 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1348 dsfield = ipv6_get_dsfield(ipv6h); 1349 else 1350 dsfield = ip6_tclass(t->parms.flowinfo); 1351 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 1352 fl6.flowlabel |= ip6_flowlabel(ipv6h); 1353 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1354 fl6.flowi6_mark = skb->mark; 1355 else 1356 fl6.flowi6_mark = t->parms.fwmark; 1357 } 1358 1359 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1360 1361 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1362 return -1; 1363 1364 dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h)); 1365 1366 skb_set_inner_ipproto(skb, IPPROTO_IPV6); 1367 1368 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1369 IPPROTO_IPV6); 1370 if (err != 0) { 1371 if (err == -EMSGSIZE) 1372 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1373 return -1; 1374 } 1375 1376 return 0; 1377 } 1378 1379 static netdev_tx_t 1380 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) 1381 { 1382 struct ip6_tnl *t = netdev_priv(dev); 1383 struct net_device_stats *stats = &t->dev->stats; 1384 int ret; 1385 1386 switch (skb->protocol) { 1387 case htons(ETH_P_IP): 1388 ret = ip4ip6_tnl_xmit(skb, dev); 1389 break; 1390 case htons(ETH_P_IPV6): 1391 ret = ip6ip6_tnl_xmit(skb, dev); 1392 break; 1393 default: 1394 goto tx_err; 1395 } 1396 1397 if (ret < 0) 1398 goto tx_err; 1399 1400 return NETDEV_TX_OK; 1401 1402 tx_err: 1403 stats->tx_errors++; 1404 stats->tx_dropped++; 1405 kfree_skb(skb); 1406 return NETDEV_TX_OK; 1407 } 1408 1409 static void ip6_tnl_link_config(struct ip6_tnl *t) 1410 { 1411 struct net_device *dev = t->dev; 1412 struct __ip6_tnl_parm *p = &t->parms; 1413 struct flowi6 *fl6 = &t->fl.u.ip6; 1414 int t_hlen; 1415 1416 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1417 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1418 1419 /* Set up flowi template */ 1420 fl6->saddr = p->laddr; 1421 fl6->daddr = p->raddr; 1422 fl6->flowi6_oif = p->link; 1423 fl6->flowlabel = 0; 1424 1425 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1426 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1427 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1428 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1429 1430 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1431 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1432 1433 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) 1434 dev->flags |= IFF_POINTOPOINT; 1435 else 1436 dev->flags &= ~IFF_POINTOPOINT; 1437 1438 t->tun_hlen = 0; 1439 t->hlen = t->encap_hlen + t->tun_hlen; 1440 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1441 1442 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1443 int strict = (ipv6_addr_type(&p->raddr) & 1444 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1445 1446 struct rt6_info *rt = rt6_lookup(t->net, 1447 &p->raddr, &p->laddr, 1448 p->link, strict); 1449 1450 if (!rt) 1451 return; 1452 1453 if (rt->dst.dev) { 1454 dev->hard_header_len = rt->dst.dev->hard_header_len + 1455 t_hlen; 1456 1457 dev->mtu = rt->dst.dev->mtu - t_hlen; 1458 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1459 dev->mtu -= 8; 1460 1461 if (dev->mtu < IPV6_MIN_MTU) 1462 dev->mtu = IPV6_MIN_MTU; 1463 } 1464 ip6_rt_put(rt); 1465 } 1466 } 1467 1468 /** 1469 * ip6_tnl_change - update the tunnel parameters 1470 * @t: tunnel to be changed 1471 * @p: tunnel configuration parameters 1472 * 1473 * Description: 1474 * ip6_tnl_change() updates the tunnel parameters 1475 **/ 1476 1477 static int 1478 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) 1479 { 1480 t->parms.laddr = p->laddr; 1481 t->parms.raddr = p->raddr; 1482 t->parms.flags = p->flags; 1483 t->parms.hop_limit = p->hop_limit; 1484 t->parms.encap_limit = p->encap_limit; 1485 t->parms.flowinfo = p->flowinfo; 1486 t->parms.link = p->link; 1487 t->parms.proto = p->proto; 1488 t->parms.fwmark = p->fwmark; 1489 dst_cache_reset(&t->dst_cache); 1490 ip6_tnl_link_config(t); 1491 return 0; 1492 } 1493 1494 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1495 { 1496 struct net *net = t->net; 1497 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1498 int err; 1499 1500 ip6_tnl_unlink(ip6n, t); 1501 synchronize_net(); 1502 err = ip6_tnl_change(t, p); 1503 ip6_tnl_link(ip6n, t); 1504 netdev_state_change(t->dev); 1505 return err; 1506 } 1507 1508 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1509 { 1510 /* for default tnl0 device allow to change only the proto */ 1511 t->parms.proto = p->proto; 1512 netdev_state_change(t->dev); 1513 return 0; 1514 } 1515 1516 static void 1517 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) 1518 { 1519 p->laddr = u->laddr; 1520 p->raddr = u->raddr; 1521 p->flags = u->flags; 1522 p->hop_limit = u->hop_limit; 1523 p->encap_limit = u->encap_limit; 1524 p->flowinfo = u->flowinfo; 1525 p->link = u->link; 1526 p->proto = u->proto; 1527 memcpy(p->name, u->name, sizeof(u->name)); 1528 } 1529 1530 static void 1531 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) 1532 { 1533 u->laddr = p->laddr; 1534 u->raddr = p->raddr; 1535 u->flags = p->flags; 1536 u->hop_limit = p->hop_limit; 1537 u->encap_limit = p->encap_limit; 1538 u->flowinfo = p->flowinfo; 1539 u->link = p->link; 1540 u->proto = p->proto; 1541 memcpy(u->name, p->name, sizeof(u->name)); 1542 } 1543 1544 /** 1545 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace 1546 * @dev: virtual device associated with tunnel 1547 * @ifr: parameters passed from userspace 1548 * @cmd: command to be performed 1549 * 1550 * Description: 1551 * ip6_tnl_ioctl() is used for managing IPv6 tunnels 1552 * from userspace. 1553 * 1554 * The possible commands are the following: 1555 * %SIOCGETTUNNEL: get tunnel parameters for device 1556 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 1557 * %SIOCCHGTUNNEL: change tunnel parameters to those given 1558 * %SIOCDELTUNNEL: delete tunnel 1559 * 1560 * The fallback device "ip6tnl0", created during module 1561 * initialization, can be used for creating other tunnel devices. 1562 * 1563 * Return: 1564 * 0 on success, 1565 * %-EFAULT if unable to copy data to or from userspace, 1566 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 1567 * %-EINVAL if passed tunnel parameters are invalid, 1568 * %-EEXIST if changing a tunnel's parameters would cause a conflict 1569 * %-ENODEV if attempting to change or delete a nonexisting device 1570 **/ 1571 1572 static int 1573 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1574 { 1575 int err = 0; 1576 struct ip6_tnl_parm p; 1577 struct __ip6_tnl_parm p1; 1578 struct ip6_tnl *t = netdev_priv(dev); 1579 struct net *net = t->net; 1580 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1581 1582 memset(&p1, 0, sizeof(p1)); 1583 1584 switch (cmd) { 1585 case SIOCGETTUNNEL: 1586 if (dev == ip6n->fb_tnl_dev) { 1587 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1588 err = -EFAULT; 1589 break; 1590 } 1591 ip6_tnl_parm_from_user(&p1, &p); 1592 t = ip6_tnl_locate(net, &p1, 0); 1593 if (IS_ERR(t)) 1594 t = netdev_priv(dev); 1595 } else { 1596 memset(&p, 0, sizeof(p)); 1597 } 1598 ip6_tnl_parm_to_user(&p, &t->parms); 1599 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { 1600 err = -EFAULT; 1601 } 1602 break; 1603 case SIOCADDTUNNEL: 1604 case SIOCCHGTUNNEL: 1605 err = -EPERM; 1606 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1607 break; 1608 err = -EFAULT; 1609 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1610 break; 1611 err = -EINVAL; 1612 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 1613 p.proto != 0) 1614 break; 1615 ip6_tnl_parm_from_user(&p1, &p); 1616 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); 1617 if (cmd == SIOCCHGTUNNEL) { 1618 if (!IS_ERR(t)) { 1619 if (t->dev != dev) { 1620 err = -EEXIST; 1621 break; 1622 } 1623 } else 1624 t = netdev_priv(dev); 1625 if (dev == ip6n->fb_tnl_dev) 1626 err = ip6_tnl0_update(t, &p1); 1627 else 1628 err = ip6_tnl_update(t, &p1); 1629 } 1630 if (!IS_ERR(t)) { 1631 err = 0; 1632 ip6_tnl_parm_to_user(&p, &t->parms); 1633 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1634 err = -EFAULT; 1635 1636 } else { 1637 err = PTR_ERR(t); 1638 } 1639 break; 1640 case SIOCDELTUNNEL: 1641 err = -EPERM; 1642 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1643 break; 1644 1645 if (dev == ip6n->fb_tnl_dev) { 1646 err = -EFAULT; 1647 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1648 break; 1649 err = -ENOENT; 1650 ip6_tnl_parm_from_user(&p1, &p); 1651 t = ip6_tnl_locate(net, &p1, 0); 1652 if (IS_ERR(t)) 1653 break; 1654 err = -EPERM; 1655 if (t->dev == ip6n->fb_tnl_dev) 1656 break; 1657 dev = t->dev; 1658 } 1659 err = 0; 1660 unregister_netdevice(dev); 1661 break; 1662 default: 1663 err = -EINVAL; 1664 } 1665 return err; 1666 } 1667 1668 /** 1669 * ip6_tnl_change_mtu - change mtu manually for tunnel device 1670 * @dev: virtual device associated with tunnel 1671 * @new_mtu: the new mtu 1672 * 1673 * Return: 1674 * 0 on success, 1675 * %-EINVAL if mtu too small 1676 **/ 1677 1678 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) 1679 { 1680 struct ip6_tnl *tnl = netdev_priv(dev); 1681 1682 if (tnl->parms.proto == IPPROTO_IPIP) { 1683 if (new_mtu < ETH_MIN_MTU) 1684 return -EINVAL; 1685 } else { 1686 if (new_mtu < IPV6_MIN_MTU) 1687 return -EINVAL; 1688 } 1689 if (new_mtu > 0xFFF8 - dev->hard_header_len) 1690 return -EINVAL; 1691 dev->mtu = new_mtu; 1692 return 0; 1693 } 1694 EXPORT_SYMBOL(ip6_tnl_change_mtu); 1695 1696 int ip6_tnl_get_iflink(const struct net_device *dev) 1697 { 1698 struct ip6_tnl *t = netdev_priv(dev); 1699 1700 return t->parms.link; 1701 } 1702 EXPORT_SYMBOL(ip6_tnl_get_iflink); 1703 1704 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 1705 unsigned int num) 1706 { 1707 if (num >= MAX_IPTUN_ENCAP_OPS) 1708 return -ERANGE; 1709 1710 return !cmpxchg((const struct ip6_tnl_encap_ops **) 1711 &ip6tun_encaps[num], 1712 NULL, ops) ? 0 : -1; 1713 } 1714 EXPORT_SYMBOL(ip6_tnl_encap_add_ops); 1715 1716 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 1717 unsigned int num) 1718 { 1719 int ret; 1720 1721 if (num >= MAX_IPTUN_ENCAP_OPS) 1722 return -ERANGE; 1723 1724 ret = (cmpxchg((const struct ip6_tnl_encap_ops **) 1725 &ip6tun_encaps[num], 1726 ops, NULL) == ops) ? 0 : -1; 1727 1728 synchronize_net(); 1729 1730 return ret; 1731 } 1732 EXPORT_SYMBOL(ip6_tnl_encap_del_ops); 1733 1734 int ip6_tnl_encap_setup(struct ip6_tnl *t, 1735 struct ip_tunnel_encap *ipencap) 1736 { 1737 int hlen; 1738 1739 memset(&t->encap, 0, sizeof(t->encap)); 1740 1741 hlen = ip6_encap_hlen(ipencap); 1742 if (hlen < 0) 1743 return hlen; 1744 1745 t->encap.type = ipencap->type; 1746 t->encap.sport = ipencap->sport; 1747 t->encap.dport = ipencap->dport; 1748 t->encap.flags = ipencap->flags; 1749 1750 t->encap_hlen = hlen; 1751 t->hlen = t->encap_hlen + t->tun_hlen; 1752 1753 return 0; 1754 } 1755 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); 1756 1757 static const struct net_device_ops ip6_tnl_netdev_ops = { 1758 .ndo_init = ip6_tnl_dev_init, 1759 .ndo_uninit = ip6_tnl_dev_uninit, 1760 .ndo_start_xmit = ip6_tnl_start_xmit, 1761 .ndo_do_ioctl = ip6_tnl_ioctl, 1762 .ndo_change_mtu = ip6_tnl_change_mtu, 1763 .ndo_get_stats = ip6_get_stats, 1764 .ndo_get_iflink = ip6_tnl_get_iflink, 1765 }; 1766 1767 #define IPXIPX_FEATURES (NETIF_F_SG | \ 1768 NETIF_F_FRAGLIST | \ 1769 NETIF_F_HIGHDMA | \ 1770 NETIF_F_GSO_SOFTWARE | \ 1771 NETIF_F_HW_CSUM) 1772 1773 /** 1774 * ip6_tnl_dev_setup - setup virtual tunnel device 1775 * @dev: virtual device associated with tunnel 1776 * 1777 * Description: 1778 * Initialize function pointers and device parameters 1779 **/ 1780 1781 static void ip6_tnl_dev_setup(struct net_device *dev) 1782 { 1783 dev->netdev_ops = &ip6_tnl_netdev_ops; 1784 dev->needs_free_netdev = true; 1785 dev->priv_destructor = ip6_dev_free; 1786 1787 dev->type = ARPHRD_TUNNEL6; 1788 dev->flags |= IFF_NOARP; 1789 dev->addr_len = sizeof(struct in6_addr); 1790 dev->features |= NETIF_F_LLTX; 1791 netif_keep_dst(dev); 1792 1793 dev->features |= IPXIPX_FEATURES; 1794 dev->hw_features |= IPXIPX_FEATURES; 1795 1796 /* This perm addr will be used as interface identifier by IPv6 */ 1797 dev->addr_assign_type = NET_ADDR_RANDOM; 1798 eth_random_addr(dev->perm_addr); 1799 } 1800 1801 1802 /** 1803 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices 1804 * @dev: virtual device associated with tunnel 1805 **/ 1806 1807 static inline int 1808 ip6_tnl_dev_init_gen(struct net_device *dev) 1809 { 1810 struct ip6_tnl *t = netdev_priv(dev); 1811 int ret; 1812 int t_hlen; 1813 1814 t->dev = dev; 1815 t->net = dev_net(dev); 1816 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1817 if (!dev->tstats) 1818 return -ENOMEM; 1819 1820 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); 1821 if (ret) 1822 goto free_stats; 1823 1824 ret = gro_cells_init(&t->gro_cells, dev); 1825 if (ret) 1826 goto destroy_dst; 1827 1828 t->tun_hlen = 0; 1829 t->hlen = t->encap_hlen + t->tun_hlen; 1830 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1831 1832 dev->type = ARPHRD_TUNNEL6; 1833 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1834 dev->mtu = ETH_DATA_LEN - t_hlen; 1835 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1836 dev->mtu -= 8; 1837 dev->min_mtu = ETH_MIN_MTU; 1838 dev->max_mtu = 0xFFF8 - dev->hard_header_len; 1839 1840 return 0; 1841 1842 destroy_dst: 1843 dst_cache_destroy(&t->dst_cache); 1844 free_stats: 1845 free_percpu(dev->tstats); 1846 dev->tstats = NULL; 1847 1848 return ret; 1849 } 1850 1851 /** 1852 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices 1853 * @dev: virtual device associated with tunnel 1854 **/ 1855 1856 static int ip6_tnl_dev_init(struct net_device *dev) 1857 { 1858 struct ip6_tnl *t = netdev_priv(dev); 1859 int err = ip6_tnl_dev_init_gen(dev); 1860 1861 if (err) 1862 return err; 1863 ip6_tnl_link_config(t); 1864 if (t->parms.collect_md) { 1865 dev->features |= NETIF_F_NETNS_LOCAL; 1866 netif_keep_dst(dev); 1867 } 1868 return 0; 1869 } 1870 1871 /** 1872 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device 1873 * @dev: fallback device 1874 * 1875 * Return: 0 1876 **/ 1877 1878 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) 1879 { 1880 struct ip6_tnl *t = netdev_priv(dev); 1881 struct net *net = dev_net(dev); 1882 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1883 1884 t->parms.proto = IPPROTO_IPV6; 1885 dev_hold(dev); 1886 1887 rcu_assign_pointer(ip6n->tnls_wc[0], t); 1888 return 0; 1889 } 1890 1891 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[], 1892 struct netlink_ext_ack *extack) 1893 { 1894 u8 proto; 1895 1896 if (!data || !data[IFLA_IPTUN_PROTO]) 1897 return 0; 1898 1899 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1900 if (proto != IPPROTO_IPV6 && 1901 proto != IPPROTO_IPIP && 1902 proto != 0) 1903 return -EINVAL; 1904 1905 return 0; 1906 } 1907 1908 static void ip6_tnl_netlink_parms(struct nlattr *data[], 1909 struct __ip6_tnl_parm *parms) 1910 { 1911 memset(parms, 0, sizeof(*parms)); 1912 1913 if (!data) 1914 return; 1915 1916 if (data[IFLA_IPTUN_LINK]) 1917 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1918 1919 if (data[IFLA_IPTUN_LOCAL]) 1920 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); 1921 1922 if (data[IFLA_IPTUN_REMOTE]) 1923 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); 1924 1925 if (data[IFLA_IPTUN_TTL]) 1926 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); 1927 1928 if (data[IFLA_IPTUN_ENCAP_LIMIT]) 1929 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); 1930 1931 if (data[IFLA_IPTUN_FLOWINFO]) 1932 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); 1933 1934 if (data[IFLA_IPTUN_FLAGS]) 1935 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); 1936 1937 if (data[IFLA_IPTUN_PROTO]) 1938 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1939 1940 if (data[IFLA_IPTUN_COLLECT_METADATA]) 1941 parms->collect_md = true; 1942 1943 if (data[IFLA_IPTUN_FWMARK]) 1944 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1945 } 1946 1947 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], 1948 struct ip_tunnel_encap *ipencap) 1949 { 1950 bool ret = false; 1951 1952 memset(ipencap, 0, sizeof(*ipencap)); 1953 1954 if (!data) 1955 return ret; 1956 1957 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 1958 ret = true; 1959 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 1960 } 1961 1962 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 1963 ret = true; 1964 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 1965 } 1966 1967 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 1968 ret = true; 1969 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 1970 } 1971 1972 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 1973 ret = true; 1974 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 1975 } 1976 1977 return ret; 1978 } 1979 1980 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, 1981 struct nlattr *tb[], struct nlattr *data[], 1982 struct netlink_ext_ack *extack) 1983 { 1984 struct net *net = dev_net(dev); 1985 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1986 struct ip6_tnl *nt, *t; 1987 struct ip_tunnel_encap ipencap; 1988 1989 nt = netdev_priv(dev); 1990 1991 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 1992 int err = ip6_tnl_encap_setup(nt, &ipencap); 1993 1994 if (err < 0) 1995 return err; 1996 } 1997 1998 ip6_tnl_netlink_parms(data, &nt->parms); 1999 2000 if (nt->parms.collect_md) { 2001 if (rtnl_dereference(ip6n->collect_md_tun)) 2002 return -EEXIST; 2003 } else { 2004 t = ip6_tnl_locate(net, &nt->parms, 0); 2005 if (!IS_ERR(t)) 2006 return -EEXIST; 2007 } 2008 2009 return ip6_tnl_create2(dev); 2010 } 2011 2012 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], 2013 struct nlattr *data[], 2014 struct netlink_ext_ack *extack) 2015 { 2016 struct ip6_tnl *t = netdev_priv(dev); 2017 struct __ip6_tnl_parm p; 2018 struct net *net = t->net; 2019 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2020 struct ip_tunnel_encap ipencap; 2021 2022 if (dev == ip6n->fb_tnl_dev) 2023 return -EINVAL; 2024 2025 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 2026 int err = ip6_tnl_encap_setup(t, &ipencap); 2027 2028 if (err < 0) 2029 return err; 2030 } 2031 ip6_tnl_netlink_parms(data, &p); 2032 if (p.collect_md) 2033 return -EINVAL; 2034 2035 t = ip6_tnl_locate(net, &p, 0); 2036 if (!IS_ERR(t)) { 2037 if (t->dev != dev) 2038 return -EEXIST; 2039 } else 2040 t = netdev_priv(dev); 2041 2042 return ip6_tnl_update(t, &p); 2043 } 2044 2045 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) 2046 { 2047 struct net *net = dev_net(dev); 2048 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2049 2050 if (dev != ip6n->fb_tnl_dev) 2051 unregister_netdevice_queue(dev, head); 2052 } 2053 2054 static size_t ip6_tnl_get_size(const struct net_device *dev) 2055 { 2056 return 2057 /* IFLA_IPTUN_LINK */ 2058 nla_total_size(4) + 2059 /* IFLA_IPTUN_LOCAL */ 2060 nla_total_size(sizeof(struct in6_addr)) + 2061 /* IFLA_IPTUN_REMOTE */ 2062 nla_total_size(sizeof(struct in6_addr)) + 2063 /* IFLA_IPTUN_TTL */ 2064 nla_total_size(1) + 2065 /* IFLA_IPTUN_ENCAP_LIMIT */ 2066 nla_total_size(1) + 2067 /* IFLA_IPTUN_FLOWINFO */ 2068 nla_total_size(4) + 2069 /* IFLA_IPTUN_FLAGS */ 2070 nla_total_size(4) + 2071 /* IFLA_IPTUN_PROTO */ 2072 nla_total_size(1) + 2073 /* IFLA_IPTUN_ENCAP_TYPE */ 2074 nla_total_size(2) + 2075 /* IFLA_IPTUN_ENCAP_FLAGS */ 2076 nla_total_size(2) + 2077 /* IFLA_IPTUN_ENCAP_SPORT */ 2078 nla_total_size(2) + 2079 /* IFLA_IPTUN_ENCAP_DPORT */ 2080 nla_total_size(2) + 2081 /* IFLA_IPTUN_COLLECT_METADATA */ 2082 nla_total_size(0) + 2083 /* IFLA_IPTUN_FWMARK */ 2084 nla_total_size(4) + 2085 0; 2086 } 2087 2088 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) 2089 { 2090 struct ip6_tnl *tunnel = netdev_priv(dev); 2091 struct __ip6_tnl_parm *parm = &tunnel->parms; 2092 2093 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 2094 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || 2095 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || 2096 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || 2097 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || 2098 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || 2099 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || 2100 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) || 2101 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark)) 2102 goto nla_put_failure; 2103 2104 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || 2105 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) || 2106 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || 2107 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) 2108 goto nla_put_failure; 2109 2110 if (parm->collect_md) 2111 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) 2112 goto nla_put_failure; 2113 2114 return 0; 2115 2116 nla_put_failure: 2117 return -EMSGSIZE; 2118 } 2119 2120 struct net *ip6_tnl_get_link_net(const struct net_device *dev) 2121 { 2122 struct ip6_tnl *tunnel = netdev_priv(dev); 2123 2124 return tunnel->net; 2125 } 2126 EXPORT_SYMBOL(ip6_tnl_get_link_net); 2127 2128 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { 2129 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 2130 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, 2131 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, 2132 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 2133 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, 2134 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, 2135 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, 2136 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 2137 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 2138 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 2139 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 2140 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 2141 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, 2142 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 2143 }; 2144 2145 static struct rtnl_link_ops ip6_link_ops __read_mostly = { 2146 .kind = "ip6tnl", 2147 .maxtype = IFLA_IPTUN_MAX, 2148 .policy = ip6_tnl_policy, 2149 .priv_size = sizeof(struct ip6_tnl), 2150 .setup = ip6_tnl_dev_setup, 2151 .validate = ip6_tnl_validate, 2152 .newlink = ip6_tnl_newlink, 2153 .changelink = ip6_tnl_changelink, 2154 .dellink = ip6_tnl_dellink, 2155 .get_size = ip6_tnl_get_size, 2156 .fill_info = ip6_tnl_fill_info, 2157 .get_link_net = ip6_tnl_get_link_net, 2158 }; 2159 2160 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { 2161 .handler = ip4ip6_rcv, 2162 .err_handler = ip4ip6_err, 2163 .priority = 1, 2164 }; 2165 2166 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { 2167 .handler = ip6ip6_rcv, 2168 .err_handler = ip6ip6_err, 2169 .priority = 1, 2170 }; 2171 2172 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list) 2173 { 2174 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2175 struct net_device *dev, *aux; 2176 int h; 2177 struct ip6_tnl *t; 2178 2179 for_each_netdev_safe(net, dev, aux) 2180 if (dev->rtnl_link_ops == &ip6_link_ops) 2181 unregister_netdevice_queue(dev, list); 2182 2183 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) { 2184 t = rtnl_dereference(ip6n->tnls_r_l[h]); 2185 while (t) { 2186 /* If dev is in the same netns, it has already 2187 * been added to the list by the previous loop. 2188 */ 2189 if (!net_eq(dev_net(t->dev), net)) 2190 unregister_netdevice_queue(t->dev, list); 2191 t = rtnl_dereference(t->next); 2192 } 2193 } 2194 } 2195 2196 static int __net_init ip6_tnl_init_net(struct net *net) 2197 { 2198 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2199 struct ip6_tnl *t = NULL; 2200 int err; 2201 2202 ip6n->tnls[0] = ip6n->tnls_wc; 2203 ip6n->tnls[1] = ip6n->tnls_r_l; 2204 2205 err = -ENOMEM; 2206 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", 2207 NET_NAME_UNKNOWN, ip6_tnl_dev_setup); 2208 2209 if (!ip6n->fb_tnl_dev) 2210 goto err_alloc_dev; 2211 dev_net_set(ip6n->fb_tnl_dev, net); 2212 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; 2213 /* FB netdevice is special: we have one, and only one per netns. 2214 * Allowing to move it to another netns is clearly unsafe. 2215 */ 2216 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; 2217 2218 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); 2219 if (err < 0) 2220 goto err_register; 2221 2222 err = register_netdev(ip6n->fb_tnl_dev); 2223 if (err < 0) 2224 goto err_register; 2225 2226 t = netdev_priv(ip6n->fb_tnl_dev); 2227 2228 strcpy(t->parms.name, ip6n->fb_tnl_dev->name); 2229 return 0; 2230 2231 err_register: 2232 free_netdev(ip6n->fb_tnl_dev); 2233 err_alloc_dev: 2234 return err; 2235 } 2236 2237 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list) 2238 { 2239 struct net *net; 2240 LIST_HEAD(list); 2241 2242 rtnl_lock(); 2243 list_for_each_entry(net, net_list, exit_list) 2244 ip6_tnl_destroy_tunnels(net, &list); 2245 unregister_netdevice_many(&list); 2246 rtnl_unlock(); 2247 } 2248 2249 static struct pernet_operations ip6_tnl_net_ops = { 2250 .init = ip6_tnl_init_net, 2251 .exit_batch = ip6_tnl_exit_batch_net, 2252 .id = &ip6_tnl_net_id, 2253 .size = sizeof(struct ip6_tnl_net), 2254 }; 2255 2256 /** 2257 * ip6_tunnel_init - register protocol and reserve needed resources 2258 * 2259 * Return: 0 on success 2260 **/ 2261 2262 static int __init ip6_tunnel_init(void) 2263 { 2264 int err; 2265 2266 if (!ipv6_mod_enabled()) 2267 return -EOPNOTSUPP; 2268 2269 err = register_pernet_device(&ip6_tnl_net_ops); 2270 if (err < 0) 2271 goto out_pernet; 2272 2273 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); 2274 if (err < 0) { 2275 pr_err("%s: can't register ip4ip6\n", __func__); 2276 goto out_ip4ip6; 2277 } 2278 2279 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); 2280 if (err < 0) { 2281 pr_err("%s: can't register ip6ip6\n", __func__); 2282 goto out_ip6ip6; 2283 } 2284 err = rtnl_link_register(&ip6_link_ops); 2285 if (err < 0) 2286 goto rtnl_link_failed; 2287 2288 return 0; 2289 2290 rtnl_link_failed: 2291 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); 2292 out_ip6ip6: 2293 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); 2294 out_ip4ip6: 2295 unregister_pernet_device(&ip6_tnl_net_ops); 2296 out_pernet: 2297 return err; 2298 } 2299 2300 /** 2301 * ip6_tunnel_cleanup - free resources and unregister protocol 2302 **/ 2303 2304 static void __exit ip6_tunnel_cleanup(void) 2305 { 2306 rtnl_link_unregister(&ip6_link_ops); 2307 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) 2308 pr_info("%s: can't deregister ip4ip6\n", __func__); 2309 2310 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) 2311 pr_info("%s: can't deregister ip6ip6\n", __func__); 2312 2313 unregister_pernet_device(&ip6_tnl_net_ops); 2314 } 2315 2316 module_init(ip6_tunnel_init); 2317 module_exit(ip6_tunnel_cleanup); 2318