1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 tunneling device 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Ville Nuorvala <vnuorval@tcs.hut.fi> 8 * Yasuyuki Kozakai <kozakai@linux-ipv6.org> 9 * 10 * Based on: 11 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c 12 * 13 * RFC 2473 14 */ 15 16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18 #include <linux/module.h> 19 #include <linux/capability.h> 20 #include <linux/errno.h> 21 #include <linux/types.h> 22 #include <linux/sockios.h> 23 #include <linux/icmp.h> 24 #include <linux/if.h> 25 #include <linux/in.h> 26 #include <linux/ip.h> 27 #include <linux/net.h> 28 #include <linux/in6.h> 29 #include <linux/netdevice.h> 30 #include <linux/if_arp.h> 31 #include <linux/icmpv6.h> 32 #include <linux/init.h> 33 #include <linux/route.h> 34 #include <linux/rtnetlink.h> 35 #include <linux/netfilter_ipv6.h> 36 #include <linux/slab.h> 37 #include <linux/hash.h> 38 #include <linux/etherdevice.h> 39 40 #include <linux/uaccess.h> 41 #include <linux/atomic.h> 42 43 #include <net/icmp.h> 44 #include <net/ip.h> 45 #include <net/ip_tunnels.h> 46 #include <net/ipv6.h> 47 #include <net/ip6_route.h> 48 #include <net/addrconf.h> 49 #include <net/ip6_tunnel.h> 50 #include <net/xfrm.h> 51 #include <net/dsfield.h> 52 #include <net/inet_ecn.h> 53 #include <net/net_namespace.h> 54 #include <net/netns/generic.h> 55 #include <net/dst_metadata.h> 56 57 MODULE_AUTHOR("Ville Nuorvala"); 58 MODULE_DESCRIPTION("IPv6 tunneling device"); 59 MODULE_LICENSE("GPL"); 60 MODULE_ALIAS_RTNL_LINK("ip6tnl"); 61 MODULE_ALIAS_NETDEV("ip6tnl0"); 62 63 #define IP6_TUNNEL_HASH_SIZE_SHIFT 5 64 #define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT) 65 66 static bool log_ecn_error = true; 67 module_param(log_ecn_error, bool, 0644); 68 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); 69 70 static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2) 71 { 72 u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2); 73 74 return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT); 75 } 76 77 static int ip6_tnl_dev_init(struct net_device *dev); 78 static void ip6_tnl_dev_setup(struct net_device *dev); 79 static struct rtnl_link_ops ip6_link_ops __read_mostly; 80 81 static unsigned int ip6_tnl_net_id __read_mostly; 82 struct ip6_tnl_net { 83 /* the IPv6 tunnel fallback device */ 84 struct net_device *fb_tnl_dev; 85 /* lists for storing tunnels in use */ 86 struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE]; 87 struct ip6_tnl __rcu *tnls_wc[1]; 88 struct ip6_tnl __rcu **tnls[2]; 89 struct ip6_tnl __rcu *collect_md_tun; 90 }; 91 92 static inline int ip6_tnl_mpls_supported(void) 93 { 94 return IS_ENABLED(CONFIG_MPLS); 95 } 96 97 #define for_each_ip6_tunnel_rcu(start) \ 98 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) 99 100 /** 101 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses 102 * @net: network namespace 103 * @link: ifindex of underlying interface 104 * @remote: the address of the tunnel exit-point 105 * @local: the address of the tunnel entry-point 106 * 107 * Return: 108 * tunnel matching given end-points if found, 109 * else fallback tunnel if its device is up, 110 * else %NULL 111 **/ 112 113 static struct ip6_tnl * 114 ip6_tnl_lookup(struct net *net, int link, 115 const struct in6_addr *remote, const struct in6_addr *local) 116 { 117 unsigned int hash = HASH(remote, local); 118 struct ip6_tnl *t, *cand = NULL; 119 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 120 struct in6_addr any; 121 122 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 123 if (!ipv6_addr_equal(local, &t->parms.laddr) || 124 !ipv6_addr_equal(remote, &t->parms.raddr) || 125 !(t->dev->flags & IFF_UP)) 126 continue; 127 128 if (link == t->parms.link) 129 return t; 130 else 131 cand = t; 132 } 133 134 memset(&any, 0, sizeof(any)); 135 hash = HASH(&any, local); 136 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 137 if (!ipv6_addr_equal(local, &t->parms.laddr) || 138 !ipv6_addr_any(&t->parms.raddr) || 139 !(t->dev->flags & IFF_UP)) 140 continue; 141 142 if (link == t->parms.link) 143 return t; 144 else if (!cand) 145 cand = t; 146 } 147 148 hash = HASH(remote, &any); 149 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) { 150 if (!ipv6_addr_equal(remote, &t->parms.raddr) || 151 !ipv6_addr_any(&t->parms.laddr) || 152 !(t->dev->flags & IFF_UP)) 153 continue; 154 155 if (link == t->parms.link) 156 return t; 157 else if (!cand) 158 cand = t; 159 } 160 161 if (cand) 162 return cand; 163 164 t = rcu_dereference(ip6n->collect_md_tun); 165 if (t && t->dev->flags & IFF_UP) 166 return t; 167 168 t = rcu_dereference(ip6n->tnls_wc[0]); 169 if (t && (t->dev->flags & IFF_UP)) 170 return t; 171 172 return NULL; 173 } 174 175 /** 176 * ip6_tnl_bucket - get head of list matching given tunnel parameters 177 * @ip6n: the private data for ip6_vti in the netns 178 * @p: parameters containing tunnel end-points 179 * 180 * Description: 181 * ip6_tnl_bucket() returns the head of the list matching the 182 * &struct in6_addr entries laddr and raddr in @p. 183 * 184 * Return: head of IPv6 tunnel list 185 **/ 186 187 static struct ip6_tnl __rcu ** 188 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) 189 { 190 const struct in6_addr *remote = &p->raddr; 191 const struct in6_addr *local = &p->laddr; 192 unsigned int h = 0; 193 int prio = 0; 194 195 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { 196 prio = 1; 197 h = HASH(remote, local); 198 } 199 return &ip6n->tnls[prio][h]; 200 } 201 202 /** 203 * ip6_tnl_link - add tunnel to hash table 204 * @ip6n: the private data for ip6_vti in the netns 205 * @t: tunnel to be added 206 **/ 207 208 static void 209 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 210 { 211 struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms); 212 213 if (t->parms.collect_md) 214 rcu_assign_pointer(ip6n->collect_md_tun, t); 215 rcu_assign_pointer(t->next , rtnl_dereference(*tp)); 216 rcu_assign_pointer(*tp, t); 217 } 218 219 /** 220 * ip6_tnl_unlink - remove tunnel from hash table 221 * @ip6n: the private data for ip6_vti in the netns 222 * @t: tunnel to be removed 223 **/ 224 225 static void 226 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 227 { 228 struct ip6_tnl __rcu **tp; 229 struct ip6_tnl *iter; 230 231 if (t->parms.collect_md) 232 rcu_assign_pointer(ip6n->collect_md_tun, NULL); 233 234 for (tp = ip6_tnl_bucket(ip6n, &t->parms); 235 (iter = rtnl_dereference(*tp)) != NULL; 236 tp = &iter->next) { 237 if (t == iter) { 238 rcu_assign_pointer(*tp, t->next); 239 break; 240 } 241 } 242 } 243 244 static void ip6_dev_free(struct net_device *dev) 245 { 246 struct ip6_tnl *t = netdev_priv(dev); 247 248 gro_cells_destroy(&t->gro_cells); 249 dst_cache_destroy(&t->dst_cache); 250 free_percpu(dev->tstats); 251 } 252 253 static int ip6_tnl_create2(struct net_device *dev) 254 { 255 struct ip6_tnl *t = netdev_priv(dev); 256 struct net *net = dev_net(dev); 257 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 258 int err; 259 260 t = netdev_priv(dev); 261 262 dev->rtnl_link_ops = &ip6_link_ops; 263 err = register_netdevice(dev); 264 if (err < 0) 265 goto out; 266 267 strcpy(t->parms.name, dev->name); 268 269 ip6_tnl_link(ip6n, t); 270 return 0; 271 272 out: 273 return err; 274 } 275 276 /** 277 * ip6_tnl_create - create a new tunnel 278 * @net: network namespace 279 * @p: tunnel parameters 280 * 281 * Description: 282 * Create tunnel matching given parameters. 283 * 284 * Return: 285 * created tunnel or error pointer 286 **/ 287 288 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) 289 { 290 struct net_device *dev; 291 struct ip6_tnl *t; 292 char name[IFNAMSIZ]; 293 int err = -E2BIG; 294 295 if (p->name[0]) { 296 if (!dev_valid_name(p->name)) 297 goto failed; 298 strlcpy(name, p->name, IFNAMSIZ); 299 } else { 300 sprintf(name, "ip6tnl%%d"); 301 } 302 err = -ENOMEM; 303 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, 304 ip6_tnl_dev_setup); 305 if (!dev) 306 goto failed; 307 308 dev_net_set(dev, net); 309 310 t = netdev_priv(dev); 311 t->parms = *p; 312 t->net = dev_net(dev); 313 err = ip6_tnl_create2(dev); 314 if (err < 0) 315 goto failed_free; 316 317 return t; 318 319 failed_free: 320 free_netdev(dev); 321 failed: 322 return ERR_PTR(err); 323 } 324 325 /** 326 * ip6_tnl_locate - find or create tunnel matching given parameters 327 * @net: network namespace 328 * @p: tunnel parameters 329 * @create: != 0 if allowed to create new tunnel if no match found 330 * 331 * Description: 332 * ip6_tnl_locate() first tries to locate an existing tunnel 333 * based on @parms. If this is unsuccessful, but @create is set a new 334 * tunnel device is created and registered for use. 335 * 336 * Return: 337 * matching tunnel or error pointer 338 **/ 339 340 static struct ip6_tnl *ip6_tnl_locate(struct net *net, 341 struct __ip6_tnl_parm *p, int create) 342 { 343 const struct in6_addr *remote = &p->raddr; 344 const struct in6_addr *local = &p->laddr; 345 struct ip6_tnl __rcu **tp; 346 struct ip6_tnl *t; 347 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 348 349 for (tp = ip6_tnl_bucket(ip6n, p); 350 (t = rtnl_dereference(*tp)) != NULL; 351 tp = &t->next) { 352 if (ipv6_addr_equal(local, &t->parms.laddr) && 353 ipv6_addr_equal(remote, &t->parms.raddr) && 354 p->link == t->parms.link) { 355 if (create) 356 return ERR_PTR(-EEXIST); 357 358 return t; 359 } 360 } 361 if (!create) 362 return ERR_PTR(-ENODEV); 363 return ip6_tnl_create(net, p); 364 } 365 366 /** 367 * ip6_tnl_dev_uninit - tunnel device uninitializer 368 * @dev: the device to be destroyed 369 * 370 * Description: 371 * ip6_tnl_dev_uninit() removes tunnel from its list 372 **/ 373 374 static void 375 ip6_tnl_dev_uninit(struct net_device *dev) 376 { 377 struct ip6_tnl *t = netdev_priv(dev); 378 struct net *net = t->net; 379 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 380 381 if (dev == ip6n->fb_tnl_dev) 382 RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); 383 else 384 ip6_tnl_unlink(ip6n, t); 385 dst_cache_reset(&t->dst_cache); 386 dev_put(dev); 387 } 388 389 /** 390 * ip6_tnl_parse_tlv_enc_lim - handle encapsulation limit option 391 * @skb: received socket buffer 392 * @raw: the ICMPv6 error message data 393 * 394 * Return: 395 * 0 if none was found, 396 * else index to encapsulation limit 397 **/ 398 399 __u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) 400 { 401 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw; 402 unsigned int nhoff = raw - skb->data; 403 unsigned int off = nhoff + sizeof(*ipv6h); 404 u8 next, nexthdr = ipv6h->nexthdr; 405 406 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { 407 struct ipv6_opt_hdr *hdr; 408 u16 optlen; 409 410 if (!pskb_may_pull(skb, off + sizeof(*hdr))) 411 break; 412 413 hdr = (struct ipv6_opt_hdr *)(skb->data + off); 414 if (nexthdr == NEXTHDR_FRAGMENT) { 415 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; 416 if (frag_hdr->frag_off) 417 break; 418 optlen = 8; 419 } else if (nexthdr == NEXTHDR_AUTH) { 420 optlen = ipv6_authlen(hdr); 421 } else { 422 optlen = ipv6_optlen(hdr); 423 } 424 /* cache hdr->nexthdr, since pskb_may_pull() might 425 * invalidate hdr 426 */ 427 next = hdr->nexthdr; 428 if (nexthdr == NEXTHDR_DEST) { 429 u16 i = 2; 430 431 /* Remember : hdr is no longer valid at this point. */ 432 if (!pskb_may_pull(skb, off + optlen)) 433 break; 434 435 while (1) { 436 struct ipv6_tlv_tnl_enc_lim *tel; 437 438 /* No more room for encapsulation limit */ 439 if (i + sizeof(*tel) > optlen) 440 break; 441 442 tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i); 443 /* return index of option if found and valid */ 444 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && 445 tel->length == 1) 446 return i + off - nhoff; 447 /* else jump to next option */ 448 if (tel->type) 449 i += tel->length + 2; 450 else 451 i++; 452 } 453 } 454 nexthdr = next; 455 off += optlen; 456 } 457 return 0; 458 } 459 EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim); 460 461 /* ip6_tnl_err() should handle errors in the tunnel according to the 462 * specifications in RFC 2473. 463 */ 464 static int 465 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, 466 u8 *type, u8 *code, int *msg, __u32 *info, int offset) 467 { 468 const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data; 469 struct net *net = dev_net(skb->dev); 470 u8 rel_type = ICMPV6_DEST_UNREACH; 471 u8 rel_code = ICMPV6_ADDR_UNREACH; 472 __u32 rel_info = 0; 473 struct ip6_tnl *t; 474 int err = -ENOENT; 475 int rel_msg = 0; 476 u8 tproto; 477 __u16 len; 478 479 /* If the packet doesn't contain the original IPv6 header we are 480 in trouble since we might need the source address for further 481 processing of the error. */ 482 483 rcu_read_lock(); 484 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->daddr, &ipv6h->saddr); 485 if (!t) 486 goto out; 487 488 tproto = READ_ONCE(t->parms.proto); 489 if (tproto != ipproto && tproto != 0) 490 goto out; 491 492 err = 0; 493 494 switch (*type) { 495 case ICMPV6_DEST_UNREACH: 496 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", 497 t->parms.name); 498 rel_msg = 1; 499 break; 500 case ICMPV6_TIME_EXCEED: 501 if ((*code) == ICMPV6_EXC_HOPLIMIT) { 502 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", 503 t->parms.name); 504 rel_msg = 1; 505 } 506 break; 507 case ICMPV6_PARAMPROB: { 508 struct ipv6_tlv_tnl_enc_lim *tel; 509 __u32 teli; 510 511 teli = 0; 512 if ((*code) == ICMPV6_HDR_FIELD) 513 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data); 514 515 if (teli && teli == *info - 2) { 516 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 517 if (tel->encap_limit == 0) { 518 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n", 519 t->parms.name); 520 rel_msg = 1; 521 } 522 } else { 523 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", 524 t->parms.name); 525 } 526 break; 527 } 528 case ICMPV6_PKT_TOOBIG: { 529 __u32 mtu; 530 531 ip6_update_pmtu(skb, net, htonl(*info), 0, 0, 532 sock_net_uid(net, NULL)); 533 mtu = *info - offset; 534 if (mtu < IPV6_MIN_MTU) 535 mtu = IPV6_MIN_MTU; 536 len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len); 537 if (len > mtu) { 538 rel_type = ICMPV6_PKT_TOOBIG; 539 rel_code = 0; 540 rel_info = mtu; 541 rel_msg = 1; 542 } 543 break; 544 } 545 case NDISC_REDIRECT: 546 ip6_redirect(skb, net, skb->dev->ifindex, 0, 547 sock_net_uid(net, NULL)); 548 break; 549 } 550 551 *type = rel_type; 552 *code = rel_code; 553 *info = rel_info; 554 *msg = rel_msg; 555 556 out: 557 rcu_read_unlock(); 558 return err; 559 } 560 561 static int 562 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 563 u8 type, u8 code, int offset, __be32 info) 564 { 565 __u32 rel_info = ntohl(info); 566 const struct iphdr *eiph; 567 struct sk_buff *skb2; 568 int err, rel_msg = 0; 569 u8 rel_type = type; 570 u8 rel_code = code; 571 struct rtable *rt; 572 struct flowi4 fl4; 573 574 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, 575 &rel_msg, &rel_info, offset); 576 if (err < 0) 577 return err; 578 579 if (rel_msg == 0) 580 return 0; 581 582 switch (rel_type) { 583 case ICMPV6_DEST_UNREACH: 584 if (rel_code != ICMPV6_ADDR_UNREACH) 585 return 0; 586 rel_type = ICMP_DEST_UNREACH; 587 rel_code = ICMP_HOST_UNREACH; 588 break; 589 case ICMPV6_PKT_TOOBIG: 590 if (rel_code != 0) 591 return 0; 592 rel_type = ICMP_DEST_UNREACH; 593 rel_code = ICMP_FRAG_NEEDED; 594 break; 595 default: 596 return 0; 597 } 598 599 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) 600 return 0; 601 602 skb2 = skb_clone(skb, GFP_ATOMIC); 603 if (!skb2) 604 return 0; 605 606 skb_dst_drop(skb2); 607 608 skb_pull(skb2, offset); 609 skb_reset_network_header(skb2); 610 eiph = ip_hdr(skb2); 611 612 /* Try to guess incoming interface */ 613 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr, 614 0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 615 if (IS_ERR(rt)) 616 goto out; 617 618 skb2->dev = rt->dst.dev; 619 ip_rt_put(rt); 620 621 /* route "incoming" packet */ 622 if (rt->rt_flags & RTCF_LOCAL) { 623 rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, 624 eiph->daddr, eiph->saddr, 0, 0, 625 IPPROTO_IPIP, RT_TOS(eiph->tos), 0); 626 if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL6) { 627 if (!IS_ERR(rt)) 628 ip_rt_put(rt); 629 goto out; 630 } 631 skb_dst_set(skb2, &rt->dst); 632 } else { 633 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, 634 skb2->dev) || 635 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL6) 636 goto out; 637 } 638 639 /* change mtu on this route */ 640 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { 641 if (rel_info > dst_mtu(skb_dst(skb2))) 642 goto out; 643 644 skb_dst_update_pmtu_no_confirm(skb2, rel_info); 645 } 646 647 icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); 648 649 out: 650 kfree_skb(skb2); 651 return 0; 652 } 653 654 static int 655 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 656 u8 type, u8 code, int offset, __be32 info) 657 { 658 __u32 rel_info = ntohl(info); 659 int err, rel_msg = 0; 660 u8 rel_type = type; 661 u8 rel_code = code; 662 663 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, 664 &rel_msg, &rel_info, offset); 665 if (err < 0) 666 return err; 667 668 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { 669 struct rt6_info *rt; 670 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 671 672 if (!skb2) 673 return 0; 674 675 skb_dst_drop(skb2); 676 skb_pull(skb2, offset); 677 skb_reset_network_header(skb2); 678 679 /* Try to guess incoming interface */ 680 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, 681 NULL, 0, skb2, 0); 682 683 if (rt && rt->dst.dev) 684 skb2->dev = rt->dst.dev; 685 686 icmpv6_send(skb2, rel_type, rel_code, rel_info); 687 688 ip6_rt_put(rt); 689 690 kfree_skb(skb2); 691 } 692 693 return 0; 694 } 695 696 static int 697 mplsip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 698 u8 type, u8 code, int offset, __be32 info) 699 { 700 __u32 rel_info = ntohl(info); 701 int err, rel_msg = 0; 702 u8 rel_type = type; 703 u8 rel_code = code; 704 705 err = ip6_tnl_err(skb, IPPROTO_MPLS, opt, &rel_type, &rel_code, 706 &rel_msg, &rel_info, offset); 707 return err; 708 } 709 710 static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 711 const struct ipv6hdr *ipv6h, 712 struct sk_buff *skb) 713 { 714 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; 715 716 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 717 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); 718 719 return IP6_ECN_decapsulate(ipv6h, skb); 720 } 721 722 static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 723 const struct ipv6hdr *ipv6h, 724 struct sk_buff *skb) 725 { 726 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 727 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); 728 729 return IP6_ECN_decapsulate(ipv6h, skb); 730 } 731 732 static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, 733 const struct ipv6hdr *ipv6h, 734 struct sk_buff *skb) 735 { 736 /* ECN is not supported in AF_MPLS */ 737 return 0; 738 } 739 740 __u32 ip6_tnl_get_cap(struct ip6_tnl *t, 741 const struct in6_addr *laddr, 742 const struct in6_addr *raddr) 743 { 744 struct __ip6_tnl_parm *p = &t->parms; 745 int ltype = ipv6_addr_type(laddr); 746 int rtype = ipv6_addr_type(raddr); 747 __u32 flags = 0; 748 749 if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) { 750 flags = IP6_TNL_F_CAP_PER_PACKET; 751 } else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 752 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 753 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && 754 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { 755 if (ltype&IPV6_ADDR_UNICAST) 756 flags |= IP6_TNL_F_CAP_XMIT; 757 if (rtype&IPV6_ADDR_UNICAST) 758 flags |= IP6_TNL_F_CAP_RCV; 759 } 760 return flags; 761 } 762 EXPORT_SYMBOL(ip6_tnl_get_cap); 763 764 /* called with rcu_read_lock() */ 765 int ip6_tnl_rcv_ctl(struct ip6_tnl *t, 766 const struct in6_addr *laddr, 767 const struct in6_addr *raddr) 768 { 769 struct __ip6_tnl_parm *p = &t->parms; 770 int ret = 0; 771 struct net *net = t->net; 772 773 if ((p->flags & IP6_TNL_F_CAP_RCV) || 774 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 775 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) { 776 struct net_device *ldev = NULL; 777 778 if (p->link) 779 ldev = dev_get_by_index_rcu(net, p->link); 780 781 if ((ipv6_addr_is_multicast(laddr) || 782 likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false, 783 0, IFA_F_TENTATIVE))) && 784 ((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) || 785 likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true, 786 0, IFA_F_TENTATIVE)))) 787 ret = 1; 788 } 789 return ret; 790 } 791 EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl); 792 793 static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb, 794 const struct tnl_ptk_info *tpi, 795 struct metadata_dst *tun_dst, 796 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 797 const struct ipv6hdr *ipv6h, 798 struct sk_buff *skb), 799 bool log_ecn_err) 800 { 801 struct pcpu_sw_netstats *tstats; 802 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 803 int err; 804 805 if ((!(tpi->flags & TUNNEL_CSUM) && 806 (tunnel->parms.i_flags & TUNNEL_CSUM)) || 807 ((tpi->flags & TUNNEL_CSUM) && 808 !(tunnel->parms.i_flags & TUNNEL_CSUM))) { 809 tunnel->dev->stats.rx_crc_errors++; 810 tunnel->dev->stats.rx_errors++; 811 goto drop; 812 } 813 814 if (tunnel->parms.i_flags & TUNNEL_SEQ) { 815 if (!(tpi->flags & TUNNEL_SEQ) || 816 (tunnel->i_seqno && 817 (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) { 818 tunnel->dev->stats.rx_fifo_errors++; 819 tunnel->dev->stats.rx_errors++; 820 goto drop; 821 } 822 tunnel->i_seqno = ntohl(tpi->seq) + 1; 823 } 824 825 skb->protocol = tpi->proto; 826 827 /* Warning: All skb pointers will be invalidated! */ 828 if (tunnel->dev->type == ARPHRD_ETHER) { 829 if (!pskb_may_pull(skb, ETH_HLEN)) { 830 tunnel->dev->stats.rx_length_errors++; 831 tunnel->dev->stats.rx_errors++; 832 goto drop; 833 } 834 835 ipv6h = ipv6_hdr(skb); 836 skb->protocol = eth_type_trans(skb, tunnel->dev); 837 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 838 } else { 839 skb->dev = tunnel->dev; 840 } 841 842 skb_reset_network_header(skb); 843 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 844 845 __skb_tunnel_rx(skb, tunnel->dev, tunnel->net); 846 847 err = dscp_ecn_decapsulate(tunnel, ipv6h, skb); 848 if (unlikely(err)) { 849 if (log_ecn_err) 850 net_info_ratelimited("non-ECT from %pI6 with DS=%#x\n", 851 &ipv6h->saddr, 852 ipv6_get_dsfield(ipv6h)); 853 if (err > 1) { 854 ++tunnel->dev->stats.rx_frame_errors; 855 ++tunnel->dev->stats.rx_errors; 856 goto drop; 857 } 858 } 859 860 tstats = this_cpu_ptr(tunnel->dev->tstats); 861 u64_stats_update_begin(&tstats->syncp); 862 tstats->rx_packets++; 863 tstats->rx_bytes += skb->len; 864 u64_stats_update_end(&tstats->syncp); 865 866 skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev))); 867 868 if (tun_dst) 869 skb_dst_set(skb, (struct dst_entry *)tun_dst); 870 871 gro_cells_receive(&tunnel->gro_cells, skb); 872 return 0; 873 874 drop: 875 if (tun_dst) 876 dst_release((struct dst_entry *)tun_dst); 877 kfree_skb(skb); 878 return 0; 879 } 880 881 int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb, 882 const struct tnl_ptk_info *tpi, 883 struct metadata_dst *tun_dst, 884 bool log_ecn_err) 885 { 886 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 887 const struct ipv6hdr *ipv6h, 888 struct sk_buff *skb); 889 890 dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate; 891 if (tpi->proto == htons(ETH_P_IP)) 892 dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate; 893 894 return __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, 895 log_ecn_err); 896 } 897 EXPORT_SYMBOL(ip6_tnl_rcv); 898 899 static const struct tnl_ptk_info tpi_v6 = { 900 /* no tunnel info required for ipxip6. */ 901 .proto = htons(ETH_P_IPV6), 902 }; 903 904 static const struct tnl_ptk_info tpi_v4 = { 905 /* no tunnel info required for ipxip6. */ 906 .proto = htons(ETH_P_IP), 907 }; 908 909 static const struct tnl_ptk_info tpi_mpls = { 910 /* no tunnel info required for mplsip6. */ 911 .proto = htons(ETH_P_MPLS_UC), 912 }; 913 914 static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto, 915 const struct tnl_ptk_info *tpi, 916 int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, 917 const struct ipv6hdr *ipv6h, 918 struct sk_buff *skb)) 919 { 920 struct ip6_tnl *t; 921 const struct ipv6hdr *ipv6h = ipv6_hdr(skb); 922 struct metadata_dst *tun_dst = NULL; 923 int ret = -1; 924 925 rcu_read_lock(); 926 t = ip6_tnl_lookup(dev_net(skb->dev), skb->dev->ifindex, &ipv6h->saddr, &ipv6h->daddr); 927 928 if (t) { 929 u8 tproto = READ_ONCE(t->parms.proto); 930 931 if (tproto != ipproto && tproto != 0) 932 goto drop; 933 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) 934 goto drop; 935 ipv6h = ipv6_hdr(skb); 936 if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr)) 937 goto drop; 938 if (iptunnel_pull_header(skb, 0, tpi->proto, false)) 939 goto drop; 940 if (t->parms.collect_md) { 941 tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0); 942 if (!tun_dst) 943 goto drop; 944 } 945 ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate, 946 log_ecn_error); 947 } 948 949 rcu_read_unlock(); 950 951 return ret; 952 953 drop: 954 rcu_read_unlock(); 955 kfree_skb(skb); 956 return 0; 957 } 958 959 static int ip4ip6_rcv(struct sk_buff *skb) 960 { 961 return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4, 962 ip4ip6_dscp_ecn_decapsulate); 963 } 964 965 static int ip6ip6_rcv(struct sk_buff *skb) 966 { 967 return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6, 968 ip6ip6_dscp_ecn_decapsulate); 969 } 970 971 static int mplsip6_rcv(struct sk_buff *skb) 972 { 973 return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls, 974 mplsip6_dscp_ecn_decapsulate); 975 } 976 977 struct ipv6_tel_txoption { 978 struct ipv6_txoptions ops; 979 __u8 dst_opt[8]; 980 }; 981 982 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) 983 { 984 memset(opt, 0, sizeof(struct ipv6_tel_txoption)); 985 986 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; 987 opt->dst_opt[3] = 1; 988 opt->dst_opt[4] = encap_limit; 989 opt->dst_opt[5] = IPV6_TLV_PADN; 990 opt->dst_opt[6] = 1; 991 992 opt->ops.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt; 993 opt->ops.opt_nflen = 8; 994 } 995 996 /** 997 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 998 * @t: the outgoing tunnel device 999 * @hdr: IPv6 header from the incoming packet 1000 * 1001 * Description: 1002 * Avoid trivial tunneling loop by checking that tunnel exit-point 1003 * doesn't match source of incoming packet. 1004 * 1005 * Return: 1006 * 1 if conflict, 1007 * 0 else 1008 **/ 1009 1010 static inline bool 1011 ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr) 1012 { 1013 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 1014 } 1015 1016 int ip6_tnl_xmit_ctl(struct ip6_tnl *t, 1017 const struct in6_addr *laddr, 1018 const struct in6_addr *raddr) 1019 { 1020 struct __ip6_tnl_parm *p = &t->parms; 1021 int ret = 0; 1022 struct net *net = t->net; 1023 1024 if (t->parms.collect_md) 1025 return 1; 1026 1027 if ((p->flags & IP6_TNL_F_CAP_XMIT) || 1028 ((p->flags & IP6_TNL_F_CAP_PER_PACKET) && 1029 (ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) { 1030 struct net_device *ldev = NULL; 1031 1032 rcu_read_lock(); 1033 if (p->link) 1034 ldev = dev_get_by_index_rcu(net, p->link); 1035 1036 if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false, 1037 0, IFA_F_TENTATIVE))) 1038 pr_warn("%s xmit: Local address not yet configured!\n", 1039 p->name); 1040 else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) && 1041 !ipv6_addr_is_multicast(raddr) && 1042 unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev, 1043 true, 0, IFA_F_TENTATIVE))) 1044 pr_warn("%s xmit: Routing loop! Remote address found on this node!\n", 1045 p->name); 1046 else 1047 ret = 1; 1048 rcu_read_unlock(); 1049 } 1050 return ret; 1051 } 1052 EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl); 1053 1054 /** 1055 * ip6_tnl_xmit - encapsulate packet and send 1056 * @skb: the outgoing socket buffer 1057 * @dev: the outgoing tunnel device 1058 * @dsfield: dscp code for outer header 1059 * @fl6: flow of tunneled packet 1060 * @encap_limit: encapsulation limit 1061 * @pmtu: Path MTU is stored if packet is too big 1062 * @proto: next header value 1063 * 1064 * Description: 1065 * Build new header and do some sanity checks on the packet before sending 1066 * it. 1067 * 1068 * Return: 1069 * 0 on success 1070 * -1 fail 1071 * %-EMSGSIZE message too big. return mtu in this case. 1072 **/ 1073 1074 int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield, 1075 struct flowi6 *fl6, int encap_limit, __u32 *pmtu, 1076 __u8 proto) 1077 { 1078 struct ip6_tnl *t = netdev_priv(dev); 1079 struct net *net = t->net; 1080 struct net_device_stats *stats = &t->dev->stats; 1081 struct ipv6hdr *ipv6h; 1082 struct ipv6_tel_txoption opt; 1083 struct dst_entry *dst = NULL, *ndst = NULL; 1084 struct net_device *tdev; 1085 int mtu; 1086 unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0; 1087 unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen; 1088 unsigned int max_headroom = psh_hlen; 1089 bool use_cache = false; 1090 u8 hop_limit; 1091 int err = -1; 1092 1093 if (t->parms.collect_md) { 1094 hop_limit = skb_tunnel_info(skb)->key.ttl; 1095 goto route_lookup; 1096 } else { 1097 hop_limit = t->parms.hop_limit; 1098 } 1099 1100 /* NBMA tunnel */ 1101 if (ipv6_addr_any(&t->parms.raddr)) { 1102 if (skb->protocol == htons(ETH_P_IPV6)) { 1103 struct in6_addr *addr6; 1104 struct neighbour *neigh; 1105 int addr_type; 1106 1107 if (!skb_dst(skb)) 1108 goto tx_err_link_failure; 1109 1110 neigh = dst_neigh_lookup(skb_dst(skb), 1111 &ipv6_hdr(skb)->daddr); 1112 if (!neigh) 1113 goto tx_err_link_failure; 1114 1115 addr6 = (struct in6_addr *)&neigh->primary_key; 1116 addr_type = ipv6_addr_type(addr6); 1117 1118 if (addr_type == IPV6_ADDR_ANY) 1119 addr6 = &ipv6_hdr(skb)->daddr; 1120 1121 memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr)); 1122 neigh_release(neigh); 1123 } 1124 } else if (t->parms.proto != 0 && !(t->parms.flags & 1125 (IP6_TNL_F_USE_ORIG_TCLASS | 1126 IP6_TNL_F_USE_ORIG_FWMARK))) { 1127 /* enable the cache only if neither the outer protocol nor the 1128 * routing decision depends on the current inner header value 1129 */ 1130 use_cache = true; 1131 } 1132 1133 if (use_cache) 1134 dst = dst_cache_get(&t->dst_cache); 1135 1136 if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr)) 1137 goto tx_err_link_failure; 1138 1139 if (!dst) { 1140 route_lookup: 1141 /* add dsfield to flowlabel for route lookup */ 1142 fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel); 1143 1144 dst = ip6_route_output(net, NULL, fl6); 1145 1146 if (dst->error) 1147 goto tx_err_link_failure; 1148 dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0); 1149 if (IS_ERR(dst)) { 1150 err = PTR_ERR(dst); 1151 dst = NULL; 1152 goto tx_err_link_failure; 1153 } 1154 if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) && 1155 ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev, 1156 &fl6->daddr, 0, &fl6->saddr)) 1157 goto tx_err_link_failure; 1158 ndst = dst; 1159 } 1160 1161 tdev = dst->dev; 1162 1163 if (tdev == dev) { 1164 stats->collisions++; 1165 net_warn_ratelimited("%s: Local routing loop detected!\n", 1166 t->parms.name); 1167 goto tx_err_dst_release; 1168 } 1169 mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen; 1170 if (encap_limit >= 0) { 1171 max_headroom += 8; 1172 mtu -= 8; 1173 } 1174 mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ? 1175 IPV6_MIN_MTU : IPV4_MIN_MTU); 1176 1177 skb_dst_update_pmtu_no_confirm(skb, mtu); 1178 if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) { 1179 *pmtu = mtu; 1180 err = -EMSGSIZE; 1181 goto tx_err_dst_release; 1182 } 1183 1184 if (t->err_count > 0) { 1185 if (time_before(jiffies, 1186 t->err_time + IP6TUNNEL_ERR_TIMEO)) { 1187 t->err_count--; 1188 1189 dst_link_failure(skb); 1190 } else { 1191 t->err_count = 0; 1192 } 1193 } 1194 1195 skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev))); 1196 1197 /* 1198 * Okay, now see if we can stuff it in the buffer as-is. 1199 */ 1200 max_headroom += LL_RESERVED_SPACE(tdev); 1201 1202 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 1203 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 1204 struct sk_buff *new_skb; 1205 1206 new_skb = skb_realloc_headroom(skb, max_headroom); 1207 if (!new_skb) 1208 goto tx_err_dst_release; 1209 1210 if (skb->sk) 1211 skb_set_owner_w(new_skb, skb->sk); 1212 consume_skb(skb); 1213 skb = new_skb; 1214 } 1215 1216 if (t->parms.collect_md) { 1217 if (t->encap.type != TUNNEL_ENCAP_NONE) 1218 goto tx_err_dst_release; 1219 } else { 1220 if (use_cache && ndst) 1221 dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr); 1222 } 1223 skb_dst_set(skb, dst); 1224 1225 if (hop_limit == 0) { 1226 if (skb->protocol == htons(ETH_P_IP)) 1227 hop_limit = ip_hdr(skb)->ttl; 1228 else if (skb->protocol == htons(ETH_P_IPV6)) 1229 hop_limit = ipv6_hdr(skb)->hop_limit; 1230 else 1231 hop_limit = ip6_dst_hoplimit(dst); 1232 } 1233 1234 /* Calculate max headroom for all the headers and adjust 1235 * needed_headroom if necessary. 1236 */ 1237 max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr) 1238 + dst->header_len + t->hlen; 1239 if (max_headroom > dev->needed_headroom) 1240 dev->needed_headroom = max_headroom; 1241 1242 skb_set_inner_ipproto(skb, proto); 1243 1244 err = ip6_tnl_encap(skb, t, &proto, fl6); 1245 if (err) 1246 return err; 1247 1248 if (encap_limit >= 0) { 1249 init_tel_txopt(&opt, encap_limit); 1250 ipv6_push_frag_opts(skb, &opt.ops, &proto); 1251 } 1252 1253 skb_push(skb, sizeof(struct ipv6hdr)); 1254 skb_reset_network_header(skb); 1255 ipv6h = ipv6_hdr(skb); 1256 ip6_flow_hdr(ipv6h, dsfield, 1257 ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6)); 1258 ipv6h->hop_limit = hop_limit; 1259 ipv6h->nexthdr = proto; 1260 ipv6h->saddr = fl6->saddr; 1261 ipv6h->daddr = fl6->daddr; 1262 ip6tunnel_xmit(NULL, skb, dev); 1263 return 0; 1264 tx_err_link_failure: 1265 stats->tx_carrier_errors++; 1266 dst_link_failure(skb); 1267 tx_err_dst_release: 1268 dst_release(dst); 1269 return err; 1270 } 1271 EXPORT_SYMBOL(ip6_tnl_xmit); 1272 1273 static inline int 1274 ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, 1275 u8 protocol) 1276 { 1277 struct ip6_tnl *t = netdev_priv(dev); 1278 struct ipv6hdr *ipv6h; 1279 const struct iphdr *iph; 1280 int encap_limit = -1; 1281 __u16 offset; 1282 struct flowi6 fl6; 1283 __u8 dsfield, orig_dsfield; 1284 __u32 mtu; 1285 u8 tproto; 1286 int err; 1287 1288 tproto = READ_ONCE(t->parms.proto); 1289 if (tproto != protocol && tproto != 0) 1290 return -1; 1291 1292 if (t->parms.collect_md) { 1293 struct ip_tunnel_info *tun_info; 1294 const struct ip_tunnel_key *key; 1295 1296 tun_info = skb_tunnel_info(skb); 1297 if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) || 1298 ip_tunnel_info_af(tun_info) != AF_INET6)) 1299 return -1; 1300 key = &tun_info->key; 1301 memset(&fl6, 0, sizeof(fl6)); 1302 fl6.flowi6_proto = protocol; 1303 fl6.saddr = key->u.ipv6.src; 1304 fl6.daddr = key->u.ipv6.dst; 1305 fl6.flowlabel = key->label; 1306 dsfield = key->tos; 1307 switch (protocol) { 1308 case IPPROTO_IPIP: 1309 iph = ip_hdr(skb); 1310 orig_dsfield = ipv4_get_dsfield(iph); 1311 break; 1312 case IPPROTO_IPV6: 1313 ipv6h = ipv6_hdr(skb); 1314 orig_dsfield = ipv6_get_dsfield(ipv6h); 1315 break; 1316 default: 1317 orig_dsfield = dsfield; 1318 break; 1319 } 1320 } else { 1321 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1322 encap_limit = t->parms.encap_limit; 1323 if (protocol == IPPROTO_IPV6) { 1324 offset = ip6_tnl_parse_tlv_enc_lim(skb, 1325 skb_network_header(skb)); 1326 /* ip6_tnl_parse_tlv_enc_lim() might have 1327 * reallocated skb->head 1328 */ 1329 if (offset > 0) { 1330 struct ipv6_tlv_tnl_enc_lim *tel; 1331 1332 tel = (void *)&skb_network_header(skb)[offset]; 1333 if (tel->encap_limit == 0) { 1334 icmpv6_ndo_send(skb, ICMPV6_PARAMPROB, 1335 ICMPV6_HDR_FIELD, offset + 2); 1336 return -1; 1337 } 1338 encap_limit = tel->encap_limit - 1; 1339 } 1340 } 1341 1342 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); 1343 fl6.flowi6_proto = protocol; 1344 1345 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) 1346 fl6.flowi6_mark = skb->mark; 1347 else 1348 fl6.flowi6_mark = t->parms.fwmark; 1349 switch (protocol) { 1350 case IPPROTO_IPIP: 1351 iph = ip_hdr(skb); 1352 orig_dsfield = ipv4_get_dsfield(iph); 1353 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1354 dsfield = orig_dsfield; 1355 else 1356 dsfield = ip6_tclass(t->parms.flowinfo); 1357 break; 1358 case IPPROTO_IPV6: 1359 ipv6h = ipv6_hdr(skb); 1360 orig_dsfield = ipv6_get_dsfield(ipv6h); 1361 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) 1362 dsfield = orig_dsfield; 1363 else 1364 dsfield = ip6_tclass(t->parms.flowinfo); 1365 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 1366 fl6.flowlabel |= ip6_flowlabel(ipv6h); 1367 break; 1368 default: 1369 orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo); 1370 break; 1371 } 1372 } 1373 1374 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); 1375 dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield); 1376 1377 if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) 1378 return -1; 1379 1380 err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, 1381 protocol); 1382 if (err != 0) { 1383 /* XXX: send ICMP error even if DF is not set. */ 1384 if (err == -EMSGSIZE) 1385 switch (protocol) { 1386 case IPPROTO_IPIP: 1387 icmp_ndo_send(skb, ICMP_DEST_UNREACH, 1388 ICMP_FRAG_NEEDED, htonl(mtu)); 1389 break; 1390 case IPPROTO_IPV6: 1391 icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1392 break; 1393 default: 1394 break; 1395 } 1396 return -1; 1397 } 1398 1399 return 0; 1400 } 1401 1402 static netdev_tx_t 1403 ip6_tnl_start_xmit(struct sk_buff *skb, struct net_device *dev) 1404 { 1405 struct ip6_tnl *t = netdev_priv(dev); 1406 struct net_device_stats *stats = &t->dev->stats; 1407 u8 ipproto; 1408 int ret; 1409 1410 if (!pskb_inet_may_pull(skb)) 1411 goto tx_err; 1412 1413 switch (skb->protocol) { 1414 case htons(ETH_P_IP): 1415 ipproto = IPPROTO_IPIP; 1416 break; 1417 case htons(ETH_P_IPV6): 1418 if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb))) 1419 goto tx_err; 1420 ipproto = IPPROTO_IPV6; 1421 break; 1422 case htons(ETH_P_MPLS_UC): 1423 ipproto = IPPROTO_MPLS; 1424 break; 1425 default: 1426 goto tx_err; 1427 } 1428 1429 ret = ipxip6_tnl_xmit(skb, dev, ipproto); 1430 if (ret < 0) 1431 goto tx_err; 1432 1433 return NETDEV_TX_OK; 1434 1435 tx_err: 1436 stats->tx_errors++; 1437 stats->tx_dropped++; 1438 kfree_skb(skb); 1439 return NETDEV_TX_OK; 1440 } 1441 1442 static void ip6_tnl_link_config(struct ip6_tnl *t) 1443 { 1444 struct net_device *dev = t->dev; 1445 struct net_device *tdev = NULL; 1446 struct __ip6_tnl_parm *p = &t->parms; 1447 struct flowi6 *fl6 = &t->fl.u.ip6; 1448 unsigned int mtu; 1449 int t_hlen; 1450 1451 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1452 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1453 1454 /* Set up flowi template */ 1455 fl6->saddr = p->laddr; 1456 fl6->daddr = p->raddr; 1457 fl6->flowi6_oif = p->link; 1458 fl6->flowlabel = 0; 1459 1460 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1461 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1462 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1463 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1464 1465 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET); 1466 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr); 1467 1468 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) 1469 dev->flags |= IFF_POINTOPOINT; 1470 else 1471 dev->flags &= ~IFF_POINTOPOINT; 1472 1473 t->tun_hlen = 0; 1474 t->hlen = t->encap_hlen + t->tun_hlen; 1475 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1476 1477 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1478 int strict = (ipv6_addr_type(&p->raddr) & 1479 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1480 1481 struct rt6_info *rt = rt6_lookup(t->net, 1482 &p->raddr, &p->laddr, 1483 p->link, NULL, strict); 1484 if (rt) { 1485 tdev = rt->dst.dev; 1486 ip6_rt_put(rt); 1487 } 1488 1489 if (!tdev && p->link) 1490 tdev = __dev_get_by_index(t->net, p->link); 1491 1492 if (tdev) { 1493 dev->hard_header_len = tdev->hard_header_len + t_hlen; 1494 mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU); 1495 1496 dev->mtu = mtu - t_hlen; 1497 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1498 dev->mtu -= 8; 1499 1500 if (dev->mtu < IPV6_MIN_MTU) 1501 dev->mtu = IPV6_MIN_MTU; 1502 } 1503 } 1504 } 1505 1506 /** 1507 * ip6_tnl_change - update the tunnel parameters 1508 * @t: tunnel to be changed 1509 * @p: tunnel configuration parameters 1510 * 1511 * Description: 1512 * ip6_tnl_change() updates the tunnel parameters 1513 **/ 1514 1515 static int 1516 ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) 1517 { 1518 t->parms.laddr = p->laddr; 1519 t->parms.raddr = p->raddr; 1520 t->parms.flags = p->flags; 1521 t->parms.hop_limit = p->hop_limit; 1522 t->parms.encap_limit = p->encap_limit; 1523 t->parms.flowinfo = p->flowinfo; 1524 t->parms.link = p->link; 1525 t->parms.proto = p->proto; 1526 t->parms.fwmark = p->fwmark; 1527 dst_cache_reset(&t->dst_cache); 1528 ip6_tnl_link_config(t); 1529 return 0; 1530 } 1531 1532 static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1533 { 1534 struct net *net = t->net; 1535 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1536 int err; 1537 1538 ip6_tnl_unlink(ip6n, t); 1539 synchronize_net(); 1540 err = ip6_tnl_change(t, p); 1541 ip6_tnl_link(ip6n, t); 1542 netdev_state_change(t->dev); 1543 return err; 1544 } 1545 1546 static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p) 1547 { 1548 /* for default tnl0 device allow to change only the proto */ 1549 t->parms.proto = p->proto; 1550 netdev_state_change(t->dev); 1551 return 0; 1552 } 1553 1554 static void 1555 ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u) 1556 { 1557 p->laddr = u->laddr; 1558 p->raddr = u->raddr; 1559 p->flags = u->flags; 1560 p->hop_limit = u->hop_limit; 1561 p->encap_limit = u->encap_limit; 1562 p->flowinfo = u->flowinfo; 1563 p->link = u->link; 1564 p->proto = u->proto; 1565 memcpy(p->name, u->name, sizeof(u->name)); 1566 } 1567 1568 static void 1569 ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p) 1570 { 1571 u->laddr = p->laddr; 1572 u->raddr = p->raddr; 1573 u->flags = p->flags; 1574 u->hop_limit = p->hop_limit; 1575 u->encap_limit = p->encap_limit; 1576 u->flowinfo = p->flowinfo; 1577 u->link = p->link; 1578 u->proto = p->proto; 1579 memcpy(u->name, p->name, sizeof(u->name)); 1580 } 1581 1582 /** 1583 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace 1584 * @dev: virtual device associated with tunnel 1585 * @ifr: parameters passed from userspace 1586 * @cmd: command to be performed 1587 * 1588 * Description: 1589 * ip6_tnl_ioctl() is used for managing IPv6 tunnels 1590 * from userspace. 1591 * 1592 * The possible commands are the following: 1593 * %SIOCGETTUNNEL: get tunnel parameters for device 1594 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 1595 * %SIOCCHGTUNNEL: change tunnel parameters to those given 1596 * %SIOCDELTUNNEL: delete tunnel 1597 * 1598 * The fallback device "ip6tnl0", created during module 1599 * initialization, can be used for creating other tunnel devices. 1600 * 1601 * Return: 1602 * 0 on success, 1603 * %-EFAULT if unable to copy data to or from userspace, 1604 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 1605 * %-EINVAL if passed tunnel parameters are invalid, 1606 * %-EEXIST if changing a tunnel's parameters would cause a conflict 1607 * %-ENODEV if attempting to change or delete a nonexisting device 1608 **/ 1609 1610 static int 1611 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1612 { 1613 int err = 0; 1614 struct ip6_tnl_parm p; 1615 struct __ip6_tnl_parm p1; 1616 struct ip6_tnl *t = netdev_priv(dev); 1617 struct net *net = t->net; 1618 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1619 1620 memset(&p1, 0, sizeof(p1)); 1621 1622 switch (cmd) { 1623 case SIOCGETTUNNEL: 1624 if (dev == ip6n->fb_tnl_dev) { 1625 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) { 1626 err = -EFAULT; 1627 break; 1628 } 1629 ip6_tnl_parm_from_user(&p1, &p); 1630 t = ip6_tnl_locate(net, &p1, 0); 1631 if (IS_ERR(t)) 1632 t = netdev_priv(dev); 1633 } else { 1634 memset(&p, 0, sizeof(p)); 1635 } 1636 ip6_tnl_parm_to_user(&p, &t->parms); 1637 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) { 1638 err = -EFAULT; 1639 } 1640 break; 1641 case SIOCADDTUNNEL: 1642 case SIOCCHGTUNNEL: 1643 err = -EPERM; 1644 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1645 break; 1646 err = -EFAULT; 1647 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1648 break; 1649 err = -EINVAL; 1650 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 1651 p.proto != 0) 1652 break; 1653 ip6_tnl_parm_from_user(&p1, &p); 1654 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); 1655 if (cmd == SIOCCHGTUNNEL) { 1656 if (!IS_ERR(t)) { 1657 if (t->dev != dev) { 1658 err = -EEXIST; 1659 break; 1660 } 1661 } else 1662 t = netdev_priv(dev); 1663 if (dev == ip6n->fb_tnl_dev) 1664 err = ip6_tnl0_update(t, &p1); 1665 else 1666 err = ip6_tnl_update(t, &p1); 1667 } 1668 if (!IS_ERR(t)) { 1669 err = 0; 1670 ip6_tnl_parm_to_user(&p, &t->parms); 1671 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p))) 1672 err = -EFAULT; 1673 1674 } else { 1675 err = PTR_ERR(t); 1676 } 1677 break; 1678 case SIOCDELTUNNEL: 1679 err = -EPERM; 1680 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1681 break; 1682 1683 if (dev == ip6n->fb_tnl_dev) { 1684 err = -EFAULT; 1685 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) 1686 break; 1687 err = -ENOENT; 1688 ip6_tnl_parm_from_user(&p1, &p); 1689 t = ip6_tnl_locate(net, &p1, 0); 1690 if (IS_ERR(t)) 1691 break; 1692 err = -EPERM; 1693 if (t->dev == ip6n->fb_tnl_dev) 1694 break; 1695 dev = t->dev; 1696 } 1697 err = 0; 1698 unregister_netdevice(dev); 1699 break; 1700 default: 1701 err = -EINVAL; 1702 } 1703 return err; 1704 } 1705 1706 /** 1707 * ip6_tnl_change_mtu - change mtu manually for tunnel device 1708 * @dev: virtual device associated with tunnel 1709 * @new_mtu: the new mtu 1710 * 1711 * Return: 1712 * 0 on success, 1713 * %-EINVAL if mtu too small 1714 **/ 1715 1716 int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) 1717 { 1718 struct ip6_tnl *tnl = netdev_priv(dev); 1719 1720 if (tnl->parms.proto == IPPROTO_IPV6) { 1721 if (new_mtu < IPV6_MIN_MTU) 1722 return -EINVAL; 1723 } else { 1724 if (new_mtu < ETH_MIN_MTU) 1725 return -EINVAL; 1726 } 1727 if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) { 1728 if (new_mtu > IP6_MAX_MTU - dev->hard_header_len) 1729 return -EINVAL; 1730 } else { 1731 if (new_mtu > IP_MAX_MTU - dev->hard_header_len) 1732 return -EINVAL; 1733 } 1734 dev->mtu = new_mtu; 1735 return 0; 1736 } 1737 EXPORT_SYMBOL(ip6_tnl_change_mtu); 1738 1739 int ip6_tnl_get_iflink(const struct net_device *dev) 1740 { 1741 struct ip6_tnl *t = netdev_priv(dev); 1742 1743 return t->parms.link; 1744 } 1745 EXPORT_SYMBOL(ip6_tnl_get_iflink); 1746 1747 int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops, 1748 unsigned int num) 1749 { 1750 if (num >= MAX_IPTUN_ENCAP_OPS) 1751 return -ERANGE; 1752 1753 return !cmpxchg((const struct ip6_tnl_encap_ops **) 1754 &ip6tun_encaps[num], 1755 NULL, ops) ? 0 : -1; 1756 } 1757 EXPORT_SYMBOL(ip6_tnl_encap_add_ops); 1758 1759 int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops, 1760 unsigned int num) 1761 { 1762 int ret; 1763 1764 if (num >= MAX_IPTUN_ENCAP_OPS) 1765 return -ERANGE; 1766 1767 ret = (cmpxchg((const struct ip6_tnl_encap_ops **) 1768 &ip6tun_encaps[num], 1769 ops, NULL) == ops) ? 0 : -1; 1770 1771 synchronize_net(); 1772 1773 return ret; 1774 } 1775 EXPORT_SYMBOL(ip6_tnl_encap_del_ops); 1776 1777 int ip6_tnl_encap_setup(struct ip6_tnl *t, 1778 struct ip_tunnel_encap *ipencap) 1779 { 1780 int hlen; 1781 1782 memset(&t->encap, 0, sizeof(t->encap)); 1783 1784 hlen = ip6_encap_hlen(ipencap); 1785 if (hlen < 0) 1786 return hlen; 1787 1788 t->encap.type = ipencap->type; 1789 t->encap.sport = ipencap->sport; 1790 t->encap.dport = ipencap->dport; 1791 t->encap.flags = ipencap->flags; 1792 1793 t->encap_hlen = hlen; 1794 t->hlen = t->encap_hlen + t->tun_hlen; 1795 1796 return 0; 1797 } 1798 EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup); 1799 1800 static const struct net_device_ops ip6_tnl_netdev_ops = { 1801 .ndo_init = ip6_tnl_dev_init, 1802 .ndo_uninit = ip6_tnl_dev_uninit, 1803 .ndo_start_xmit = ip6_tnl_start_xmit, 1804 .ndo_do_ioctl = ip6_tnl_ioctl, 1805 .ndo_change_mtu = ip6_tnl_change_mtu, 1806 .ndo_get_stats64 = dev_get_tstats64, 1807 .ndo_get_iflink = ip6_tnl_get_iflink, 1808 }; 1809 1810 #define IPXIPX_FEATURES (NETIF_F_SG | \ 1811 NETIF_F_FRAGLIST | \ 1812 NETIF_F_HIGHDMA | \ 1813 NETIF_F_GSO_SOFTWARE | \ 1814 NETIF_F_HW_CSUM) 1815 1816 /** 1817 * ip6_tnl_dev_setup - setup virtual tunnel device 1818 * @dev: virtual device associated with tunnel 1819 * 1820 * Description: 1821 * Initialize function pointers and device parameters 1822 **/ 1823 1824 static void ip6_tnl_dev_setup(struct net_device *dev) 1825 { 1826 dev->netdev_ops = &ip6_tnl_netdev_ops; 1827 dev->header_ops = &ip_tunnel_header_ops; 1828 dev->needs_free_netdev = true; 1829 dev->priv_destructor = ip6_dev_free; 1830 1831 dev->type = ARPHRD_TUNNEL6; 1832 dev->flags |= IFF_NOARP; 1833 dev->addr_len = sizeof(struct in6_addr); 1834 dev->features |= NETIF_F_LLTX; 1835 netif_keep_dst(dev); 1836 1837 dev->features |= IPXIPX_FEATURES; 1838 dev->hw_features |= IPXIPX_FEATURES; 1839 1840 /* This perm addr will be used as interface identifier by IPv6 */ 1841 dev->addr_assign_type = NET_ADDR_RANDOM; 1842 eth_random_addr(dev->perm_addr); 1843 } 1844 1845 1846 /** 1847 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices 1848 * @dev: virtual device associated with tunnel 1849 **/ 1850 1851 static inline int 1852 ip6_tnl_dev_init_gen(struct net_device *dev) 1853 { 1854 struct ip6_tnl *t = netdev_priv(dev); 1855 int ret; 1856 int t_hlen; 1857 1858 t->dev = dev; 1859 t->net = dev_net(dev); 1860 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1861 if (!dev->tstats) 1862 return -ENOMEM; 1863 1864 ret = dst_cache_init(&t->dst_cache, GFP_KERNEL); 1865 if (ret) 1866 goto free_stats; 1867 1868 ret = gro_cells_init(&t->gro_cells, dev); 1869 if (ret) 1870 goto destroy_dst; 1871 1872 t->tun_hlen = 0; 1873 t->hlen = t->encap_hlen + t->tun_hlen; 1874 t_hlen = t->hlen + sizeof(struct ipv6hdr); 1875 1876 dev->type = ARPHRD_TUNNEL6; 1877 dev->hard_header_len = LL_MAX_HEADER + t_hlen; 1878 dev->mtu = ETH_DATA_LEN - t_hlen; 1879 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1880 dev->mtu -= 8; 1881 dev->min_mtu = ETH_MIN_MTU; 1882 dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len; 1883 1884 dev_hold(dev); 1885 return 0; 1886 1887 destroy_dst: 1888 dst_cache_destroy(&t->dst_cache); 1889 free_stats: 1890 free_percpu(dev->tstats); 1891 dev->tstats = NULL; 1892 1893 return ret; 1894 } 1895 1896 /** 1897 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices 1898 * @dev: virtual device associated with tunnel 1899 **/ 1900 1901 static int ip6_tnl_dev_init(struct net_device *dev) 1902 { 1903 struct ip6_tnl *t = netdev_priv(dev); 1904 int err = ip6_tnl_dev_init_gen(dev); 1905 1906 if (err) 1907 return err; 1908 ip6_tnl_link_config(t); 1909 if (t->parms.collect_md) 1910 netif_keep_dst(dev); 1911 return 0; 1912 } 1913 1914 /** 1915 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device 1916 * @dev: fallback device 1917 * 1918 * Return: 0 1919 **/ 1920 1921 static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) 1922 { 1923 struct ip6_tnl *t = netdev_priv(dev); 1924 struct net *net = dev_net(dev); 1925 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1926 1927 t->parms.proto = IPPROTO_IPV6; 1928 1929 rcu_assign_pointer(ip6n->tnls_wc[0], t); 1930 return 0; 1931 } 1932 1933 static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[], 1934 struct netlink_ext_ack *extack) 1935 { 1936 u8 proto; 1937 1938 if (!data || !data[IFLA_IPTUN_PROTO]) 1939 return 0; 1940 1941 proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1942 if (proto != IPPROTO_IPV6 && 1943 proto != IPPROTO_IPIP && 1944 proto != 0) 1945 return -EINVAL; 1946 1947 return 0; 1948 } 1949 1950 static void ip6_tnl_netlink_parms(struct nlattr *data[], 1951 struct __ip6_tnl_parm *parms) 1952 { 1953 memset(parms, 0, sizeof(*parms)); 1954 1955 if (!data) 1956 return; 1957 1958 if (data[IFLA_IPTUN_LINK]) 1959 parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]); 1960 1961 if (data[IFLA_IPTUN_LOCAL]) 1962 parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]); 1963 1964 if (data[IFLA_IPTUN_REMOTE]) 1965 parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]); 1966 1967 if (data[IFLA_IPTUN_TTL]) 1968 parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]); 1969 1970 if (data[IFLA_IPTUN_ENCAP_LIMIT]) 1971 parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]); 1972 1973 if (data[IFLA_IPTUN_FLOWINFO]) 1974 parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]); 1975 1976 if (data[IFLA_IPTUN_FLAGS]) 1977 parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]); 1978 1979 if (data[IFLA_IPTUN_PROTO]) 1980 parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]); 1981 1982 if (data[IFLA_IPTUN_COLLECT_METADATA]) 1983 parms->collect_md = true; 1984 1985 if (data[IFLA_IPTUN_FWMARK]) 1986 parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]); 1987 } 1988 1989 static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[], 1990 struct ip_tunnel_encap *ipencap) 1991 { 1992 bool ret = false; 1993 1994 memset(ipencap, 0, sizeof(*ipencap)); 1995 1996 if (!data) 1997 return ret; 1998 1999 if (data[IFLA_IPTUN_ENCAP_TYPE]) { 2000 ret = true; 2001 ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]); 2002 } 2003 2004 if (data[IFLA_IPTUN_ENCAP_FLAGS]) { 2005 ret = true; 2006 ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]); 2007 } 2008 2009 if (data[IFLA_IPTUN_ENCAP_SPORT]) { 2010 ret = true; 2011 ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]); 2012 } 2013 2014 if (data[IFLA_IPTUN_ENCAP_DPORT]) { 2015 ret = true; 2016 ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]); 2017 } 2018 2019 return ret; 2020 } 2021 2022 static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, 2023 struct nlattr *tb[], struct nlattr *data[], 2024 struct netlink_ext_ack *extack) 2025 { 2026 struct net *net = dev_net(dev); 2027 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2028 struct ip_tunnel_encap ipencap; 2029 struct ip6_tnl *nt, *t; 2030 int err; 2031 2032 nt = netdev_priv(dev); 2033 2034 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 2035 err = ip6_tnl_encap_setup(nt, &ipencap); 2036 if (err < 0) 2037 return err; 2038 } 2039 2040 ip6_tnl_netlink_parms(data, &nt->parms); 2041 2042 if (nt->parms.collect_md) { 2043 if (rtnl_dereference(ip6n->collect_md_tun)) 2044 return -EEXIST; 2045 } else { 2046 t = ip6_tnl_locate(net, &nt->parms, 0); 2047 if (!IS_ERR(t)) 2048 return -EEXIST; 2049 } 2050 2051 err = ip6_tnl_create2(dev); 2052 if (!err && tb[IFLA_MTU]) 2053 ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU])); 2054 2055 return err; 2056 } 2057 2058 static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[], 2059 struct nlattr *data[], 2060 struct netlink_ext_ack *extack) 2061 { 2062 struct ip6_tnl *t = netdev_priv(dev); 2063 struct __ip6_tnl_parm p; 2064 struct net *net = t->net; 2065 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2066 struct ip_tunnel_encap ipencap; 2067 2068 if (dev == ip6n->fb_tnl_dev) 2069 return -EINVAL; 2070 2071 if (ip6_tnl_netlink_encap_parms(data, &ipencap)) { 2072 int err = ip6_tnl_encap_setup(t, &ipencap); 2073 2074 if (err < 0) 2075 return err; 2076 } 2077 ip6_tnl_netlink_parms(data, &p); 2078 if (p.collect_md) 2079 return -EINVAL; 2080 2081 t = ip6_tnl_locate(net, &p, 0); 2082 if (!IS_ERR(t)) { 2083 if (t->dev != dev) 2084 return -EEXIST; 2085 } else 2086 t = netdev_priv(dev); 2087 2088 return ip6_tnl_update(t, &p); 2089 } 2090 2091 static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head) 2092 { 2093 struct net *net = dev_net(dev); 2094 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2095 2096 if (dev != ip6n->fb_tnl_dev) 2097 unregister_netdevice_queue(dev, head); 2098 } 2099 2100 static size_t ip6_tnl_get_size(const struct net_device *dev) 2101 { 2102 return 2103 /* IFLA_IPTUN_LINK */ 2104 nla_total_size(4) + 2105 /* IFLA_IPTUN_LOCAL */ 2106 nla_total_size(sizeof(struct in6_addr)) + 2107 /* IFLA_IPTUN_REMOTE */ 2108 nla_total_size(sizeof(struct in6_addr)) + 2109 /* IFLA_IPTUN_TTL */ 2110 nla_total_size(1) + 2111 /* IFLA_IPTUN_ENCAP_LIMIT */ 2112 nla_total_size(1) + 2113 /* IFLA_IPTUN_FLOWINFO */ 2114 nla_total_size(4) + 2115 /* IFLA_IPTUN_FLAGS */ 2116 nla_total_size(4) + 2117 /* IFLA_IPTUN_PROTO */ 2118 nla_total_size(1) + 2119 /* IFLA_IPTUN_ENCAP_TYPE */ 2120 nla_total_size(2) + 2121 /* IFLA_IPTUN_ENCAP_FLAGS */ 2122 nla_total_size(2) + 2123 /* IFLA_IPTUN_ENCAP_SPORT */ 2124 nla_total_size(2) + 2125 /* IFLA_IPTUN_ENCAP_DPORT */ 2126 nla_total_size(2) + 2127 /* IFLA_IPTUN_COLLECT_METADATA */ 2128 nla_total_size(0) + 2129 /* IFLA_IPTUN_FWMARK */ 2130 nla_total_size(4) + 2131 0; 2132 } 2133 2134 static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) 2135 { 2136 struct ip6_tnl *tunnel = netdev_priv(dev); 2137 struct __ip6_tnl_parm *parm = &tunnel->parms; 2138 2139 if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) || 2140 nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) || 2141 nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) || 2142 nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) || 2143 nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) || 2144 nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) || 2145 nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) || 2146 nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) || 2147 nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark)) 2148 goto nla_put_failure; 2149 2150 if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) || 2151 nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) || 2152 nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) || 2153 nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags)) 2154 goto nla_put_failure; 2155 2156 if (parm->collect_md) 2157 if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA)) 2158 goto nla_put_failure; 2159 2160 return 0; 2161 2162 nla_put_failure: 2163 return -EMSGSIZE; 2164 } 2165 2166 struct net *ip6_tnl_get_link_net(const struct net_device *dev) 2167 { 2168 struct ip6_tnl *tunnel = netdev_priv(dev); 2169 2170 return tunnel->net; 2171 } 2172 EXPORT_SYMBOL(ip6_tnl_get_link_net); 2173 2174 static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = { 2175 [IFLA_IPTUN_LINK] = { .type = NLA_U32 }, 2176 [IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) }, 2177 [IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) }, 2178 [IFLA_IPTUN_TTL] = { .type = NLA_U8 }, 2179 [IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 }, 2180 [IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 }, 2181 [IFLA_IPTUN_FLAGS] = { .type = NLA_U32 }, 2182 [IFLA_IPTUN_PROTO] = { .type = NLA_U8 }, 2183 [IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 }, 2184 [IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 }, 2185 [IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 }, 2186 [IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 }, 2187 [IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG }, 2188 [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 }, 2189 }; 2190 2191 static struct rtnl_link_ops ip6_link_ops __read_mostly = { 2192 .kind = "ip6tnl", 2193 .maxtype = IFLA_IPTUN_MAX, 2194 .policy = ip6_tnl_policy, 2195 .priv_size = sizeof(struct ip6_tnl), 2196 .setup = ip6_tnl_dev_setup, 2197 .validate = ip6_tnl_validate, 2198 .newlink = ip6_tnl_newlink, 2199 .changelink = ip6_tnl_changelink, 2200 .dellink = ip6_tnl_dellink, 2201 .get_size = ip6_tnl_get_size, 2202 .fill_info = ip6_tnl_fill_info, 2203 .get_link_net = ip6_tnl_get_link_net, 2204 }; 2205 2206 static struct xfrm6_tunnel ip4ip6_handler __read_mostly = { 2207 .handler = ip4ip6_rcv, 2208 .err_handler = ip4ip6_err, 2209 .priority = 1, 2210 }; 2211 2212 static struct xfrm6_tunnel ip6ip6_handler __read_mostly = { 2213 .handler = ip6ip6_rcv, 2214 .err_handler = ip6ip6_err, 2215 .priority = 1, 2216 }; 2217 2218 static struct xfrm6_tunnel mplsip6_handler __read_mostly = { 2219 .handler = mplsip6_rcv, 2220 .err_handler = mplsip6_err, 2221 .priority = 1, 2222 }; 2223 2224 static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list) 2225 { 2226 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2227 struct net_device *dev, *aux; 2228 int h; 2229 struct ip6_tnl *t; 2230 2231 for_each_netdev_safe(net, dev, aux) 2232 if (dev->rtnl_link_ops == &ip6_link_ops) 2233 unregister_netdevice_queue(dev, list); 2234 2235 for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) { 2236 t = rtnl_dereference(ip6n->tnls_r_l[h]); 2237 while (t) { 2238 /* If dev is in the same netns, it has already 2239 * been added to the list by the previous loop. 2240 */ 2241 if (!net_eq(dev_net(t->dev), net)) 2242 unregister_netdevice_queue(t->dev, list); 2243 t = rtnl_dereference(t->next); 2244 } 2245 } 2246 2247 t = rtnl_dereference(ip6n->tnls_wc[0]); 2248 while (t) { 2249 /* If dev is in the same netns, it has already 2250 * been added to the list by the previous loop. 2251 */ 2252 if (!net_eq(dev_net(t->dev), net)) 2253 unregister_netdevice_queue(t->dev, list); 2254 t = rtnl_dereference(t->next); 2255 } 2256 } 2257 2258 static int __net_init ip6_tnl_init_net(struct net *net) 2259 { 2260 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 2261 struct ip6_tnl *t = NULL; 2262 int err; 2263 2264 ip6n->tnls[0] = ip6n->tnls_wc; 2265 ip6n->tnls[1] = ip6n->tnls_r_l; 2266 2267 if (!net_has_fallback_tunnels(net)) 2268 return 0; 2269 err = -ENOMEM; 2270 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", 2271 NET_NAME_UNKNOWN, ip6_tnl_dev_setup); 2272 2273 if (!ip6n->fb_tnl_dev) 2274 goto err_alloc_dev; 2275 dev_net_set(ip6n->fb_tnl_dev, net); 2276 ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops; 2277 /* FB netdevice is special: we have one, and only one per netns. 2278 * Allowing to move it to another netns is clearly unsafe. 2279 */ 2280 ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL; 2281 2282 err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); 2283 if (err < 0) 2284 goto err_register; 2285 2286 err = register_netdev(ip6n->fb_tnl_dev); 2287 if (err < 0) 2288 goto err_register; 2289 2290 t = netdev_priv(ip6n->fb_tnl_dev); 2291 2292 strcpy(t->parms.name, ip6n->fb_tnl_dev->name); 2293 return 0; 2294 2295 err_register: 2296 free_netdev(ip6n->fb_tnl_dev); 2297 err_alloc_dev: 2298 return err; 2299 } 2300 2301 static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list) 2302 { 2303 struct net *net; 2304 LIST_HEAD(list); 2305 2306 rtnl_lock(); 2307 list_for_each_entry(net, net_list, exit_list) 2308 ip6_tnl_destroy_tunnels(net, &list); 2309 unregister_netdevice_many(&list); 2310 rtnl_unlock(); 2311 } 2312 2313 static struct pernet_operations ip6_tnl_net_ops = { 2314 .init = ip6_tnl_init_net, 2315 .exit_batch = ip6_tnl_exit_batch_net, 2316 .id = &ip6_tnl_net_id, 2317 .size = sizeof(struct ip6_tnl_net), 2318 }; 2319 2320 /** 2321 * ip6_tunnel_init - register protocol and reserve needed resources 2322 * 2323 * Return: 0 on success 2324 **/ 2325 2326 static int __init ip6_tunnel_init(void) 2327 { 2328 int err; 2329 2330 if (!ipv6_mod_enabled()) 2331 return -EOPNOTSUPP; 2332 2333 err = register_pernet_device(&ip6_tnl_net_ops); 2334 if (err < 0) 2335 goto out_pernet; 2336 2337 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); 2338 if (err < 0) { 2339 pr_err("%s: can't register ip4ip6\n", __func__); 2340 goto out_ip4ip6; 2341 } 2342 2343 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); 2344 if (err < 0) { 2345 pr_err("%s: can't register ip6ip6\n", __func__); 2346 goto out_ip6ip6; 2347 } 2348 2349 if (ip6_tnl_mpls_supported()) { 2350 err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS); 2351 if (err < 0) { 2352 pr_err("%s: can't register mplsip6\n", __func__); 2353 goto out_mplsip6; 2354 } 2355 } 2356 2357 err = rtnl_link_register(&ip6_link_ops); 2358 if (err < 0) 2359 goto rtnl_link_failed; 2360 2361 return 0; 2362 2363 rtnl_link_failed: 2364 if (ip6_tnl_mpls_supported()) 2365 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS); 2366 out_mplsip6: 2367 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); 2368 out_ip6ip6: 2369 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); 2370 out_ip4ip6: 2371 unregister_pernet_device(&ip6_tnl_net_ops); 2372 out_pernet: 2373 return err; 2374 } 2375 2376 /** 2377 * ip6_tunnel_cleanup - free resources and unregister protocol 2378 **/ 2379 2380 static void __exit ip6_tunnel_cleanup(void) 2381 { 2382 rtnl_link_unregister(&ip6_link_ops); 2383 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) 2384 pr_info("%s: can't deregister ip4ip6\n", __func__); 2385 2386 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) 2387 pr_info("%s: can't deregister ip6ip6\n", __func__); 2388 2389 if (ip6_tnl_mpls_supported() && 2390 xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS)) 2391 pr_info("%s: can't deregister mplsip6\n", __func__); 2392 unregister_pernet_device(&ip6_tnl_net_ops); 2393 } 2394 2395 module_init(ip6_tunnel_init); 2396 module_exit(ip6_tunnel_cleanup); 2397