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 #include <linux/module.h> 22 #include <linux/capability.h> 23 #include <linux/errno.h> 24 #include <linux/types.h> 25 #include <linux/sockios.h> 26 #include <linux/icmp.h> 27 #include <linux/if.h> 28 #include <linux/in.h> 29 #include <linux/ip.h> 30 #include <linux/if_tunnel.h> 31 #include <linux/net.h> 32 #include <linux/in6.h> 33 #include <linux/netdevice.h> 34 #include <linux/if_arp.h> 35 #include <linux/icmpv6.h> 36 #include <linux/init.h> 37 #include <linux/route.h> 38 #include <linux/rtnetlink.h> 39 #include <linux/netfilter_ipv6.h> 40 #include <linux/slab.h> 41 42 #include <asm/uaccess.h> 43 #include <asm/atomic.h> 44 45 #include <net/icmp.h> 46 #include <net/ip.h> 47 #include <net/ipv6.h> 48 #include <net/ip6_route.h> 49 #include <net/addrconf.h> 50 #include <net/ip6_tunnel.h> 51 #include <net/xfrm.h> 52 #include <net/dsfield.h> 53 #include <net/inet_ecn.h> 54 #include <net/net_namespace.h> 55 #include <net/netns/generic.h> 56 57 MODULE_AUTHOR("Ville Nuorvala"); 58 MODULE_DESCRIPTION("IPv6 tunneling device"); 59 MODULE_LICENSE("GPL"); 60 61 #define IPV6_TLV_TEL_DST_SIZE 8 62 63 #ifdef IP6_TNL_DEBUG 64 #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __func__) 65 #else 66 #define IP6_TNL_TRACE(x...) do {;} while(0) 67 #endif 68 69 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 70 #define IPV6_TCLASS_SHIFT 20 71 72 #define HASH_SIZE 32 73 74 #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \ 75 (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ 76 (HASH_SIZE - 1)) 77 78 static void ip6_tnl_dev_init(struct net_device *dev); 79 static void ip6_tnl_dev_setup(struct net_device *dev); 80 81 static 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 *tnls_r_l[HASH_SIZE]; 87 struct ip6_tnl *tnls_wc[1]; 88 struct ip6_tnl **tnls[2]; 89 }; 90 91 /* 92 * Locking : hash tables are protected by RCU and a spinlock 93 */ 94 static DEFINE_SPINLOCK(ip6_tnl_lock); 95 96 static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) 97 { 98 struct dst_entry *dst = t->dst_cache; 99 100 if (dst && dst->obsolete && 101 dst->ops->check(dst, t->dst_cookie) == NULL) { 102 t->dst_cache = NULL; 103 dst_release(dst); 104 return NULL; 105 } 106 107 return dst; 108 } 109 110 static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) 111 { 112 dst_release(t->dst_cache); 113 t->dst_cache = NULL; 114 } 115 116 static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) 117 { 118 struct rt6_info *rt = (struct rt6_info *) dst; 119 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; 120 dst_release(t->dst_cache); 121 t->dst_cache = dst; 122 } 123 124 /** 125 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses 126 * @remote: the address of the tunnel exit-point 127 * @local: the address of the tunnel entry-point 128 * 129 * Return: 130 * tunnel matching given end-points if found, 131 * else fallback tunnel if its device is up, 132 * else %NULL 133 **/ 134 135 #define for_each_ip6_tunnel_rcu(start) \ 136 for (t = rcu_dereference(start); t; t = rcu_dereference(t->next)) 137 138 static struct ip6_tnl * 139 ip6_tnl_lookup(struct net *net, struct in6_addr *remote, struct in6_addr *local) 140 { 141 unsigned h0 = HASH(remote); 142 unsigned h1 = HASH(local); 143 struct ip6_tnl *t; 144 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 145 146 for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[h0 ^ h1]) { 147 if (ipv6_addr_equal(local, &t->parms.laddr) && 148 ipv6_addr_equal(remote, &t->parms.raddr) && 149 (t->dev->flags & IFF_UP)) 150 return t; 151 } 152 t = rcu_dereference(ip6n->tnls_wc[0]); 153 if (t && (t->dev->flags & IFF_UP)) 154 return t; 155 156 return NULL; 157 } 158 159 /** 160 * ip6_tnl_bucket - get head of list matching given tunnel parameters 161 * @p: parameters containing tunnel end-points 162 * 163 * Description: 164 * ip6_tnl_bucket() returns the head of the list matching the 165 * &struct in6_addr entries laddr and raddr in @p. 166 * 167 * Return: head of IPv6 tunnel list 168 **/ 169 170 static struct ip6_tnl ** 171 ip6_tnl_bucket(struct ip6_tnl_net *ip6n, struct ip6_tnl_parm *p) 172 { 173 struct in6_addr *remote = &p->raddr; 174 struct in6_addr *local = &p->laddr; 175 unsigned h = 0; 176 int prio = 0; 177 178 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { 179 prio = 1; 180 h = HASH(remote) ^ HASH(local); 181 } 182 return &ip6n->tnls[prio][h]; 183 } 184 185 /** 186 * ip6_tnl_link - add tunnel to hash table 187 * @t: tunnel to be added 188 **/ 189 190 static void 191 ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 192 { 193 struct ip6_tnl **tp = ip6_tnl_bucket(ip6n, &t->parms); 194 195 spin_lock_bh(&ip6_tnl_lock); 196 t->next = *tp; 197 rcu_assign_pointer(*tp, t); 198 spin_unlock_bh(&ip6_tnl_lock); 199 } 200 201 /** 202 * ip6_tnl_unlink - remove tunnel from hash table 203 * @t: tunnel to be removed 204 **/ 205 206 static void 207 ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *t) 208 { 209 struct ip6_tnl **tp; 210 211 for (tp = ip6_tnl_bucket(ip6n, &t->parms); *tp; tp = &(*tp)->next) { 212 if (t == *tp) { 213 spin_lock_bh(&ip6_tnl_lock); 214 *tp = t->next; 215 spin_unlock_bh(&ip6_tnl_lock); 216 break; 217 } 218 } 219 } 220 221 /** 222 * ip6_tnl_create() - create a new tunnel 223 * @p: tunnel parameters 224 * @pt: pointer to new tunnel 225 * 226 * Description: 227 * Create tunnel matching given parameters. 228 * 229 * Return: 230 * created tunnel or NULL 231 **/ 232 233 static struct ip6_tnl *ip6_tnl_create(struct net *net, struct ip6_tnl_parm *p) 234 { 235 struct net_device *dev; 236 struct ip6_tnl *t; 237 char name[IFNAMSIZ]; 238 int err; 239 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 240 241 if (p->name[0]) 242 strlcpy(name, p->name, IFNAMSIZ); 243 else 244 sprintf(name, "ip6tnl%%d"); 245 246 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); 247 if (dev == NULL) 248 goto failed; 249 250 dev_net_set(dev, net); 251 252 if (strchr(name, '%')) { 253 if (dev_alloc_name(dev, name) < 0) 254 goto failed_free; 255 } 256 257 t = netdev_priv(dev); 258 t->parms = *p; 259 ip6_tnl_dev_init(dev); 260 261 if ((err = register_netdevice(dev)) < 0) 262 goto failed_free; 263 264 dev_hold(dev); 265 ip6_tnl_link(ip6n, t); 266 return t; 267 268 failed_free: 269 free_netdev(dev); 270 failed: 271 return NULL; 272 } 273 274 /** 275 * ip6_tnl_locate - find or create tunnel matching given parameters 276 * @p: tunnel parameters 277 * @create: != 0 if allowed to create new tunnel if no match found 278 * 279 * Description: 280 * ip6_tnl_locate() first tries to locate an existing tunnel 281 * based on @parms. If this is unsuccessful, but @create is set a new 282 * tunnel device is created and registered for use. 283 * 284 * Return: 285 * matching tunnel or NULL 286 **/ 287 288 static struct ip6_tnl *ip6_tnl_locate(struct net *net, 289 struct ip6_tnl_parm *p, int create) 290 { 291 struct in6_addr *remote = &p->raddr; 292 struct in6_addr *local = &p->laddr; 293 struct ip6_tnl *t; 294 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 295 296 for (t = *ip6_tnl_bucket(ip6n, p); t; t = t->next) { 297 if (ipv6_addr_equal(local, &t->parms.laddr) && 298 ipv6_addr_equal(remote, &t->parms.raddr)) 299 return t; 300 } 301 if (!create) 302 return NULL; 303 return ip6_tnl_create(net, p); 304 } 305 306 /** 307 * ip6_tnl_dev_uninit - tunnel device uninitializer 308 * @dev: the device to be destroyed 309 * 310 * Description: 311 * ip6_tnl_dev_uninit() removes tunnel from its list 312 **/ 313 314 static void 315 ip6_tnl_dev_uninit(struct net_device *dev) 316 { 317 struct ip6_tnl *t = netdev_priv(dev); 318 struct net *net = dev_net(dev); 319 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 320 321 if (dev == ip6n->fb_tnl_dev) { 322 spin_lock_bh(&ip6_tnl_lock); 323 ip6n->tnls_wc[0] = NULL; 324 spin_unlock_bh(&ip6_tnl_lock); 325 } else { 326 ip6_tnl_unlink(ip6n, t); 327 } 328 ip6_tnl_dst_reset(t); 329 dev_put(dev); 330 } 331 332 /** 333 * parse_tvl_tnl_enc_lim - handle encapsulation limit option 334 * @skb: received socket buffer 335 * 336 * Return: 337 * 0 if none was found, 338 * else index to encapsulation limit 339 **/ 340 341 static __u16 342 parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) 343 { 344 struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw; 345 __u8 nexthdr = ipv6h->nexthdr; 346 __u16 off = sizeof (*ipv6h); 347 348 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { 349 __u16 optlen = 0; 350 struct ipv6_opt_hdr *hdr; 351 if (raw + off + sizeof (*hdr) > skb->data && 352 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) 353 break; 354 355 hdr = (struct ipv6_opt_hdr *) (raw + off); 356 if (nexthdr == NEXTHDR_FRAGMENT) { 357 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; 358 if (frag_hdr->frag_off) 359 break; 360 optlen = 8; 361 } else if (nexthdr == NEXTHDR_AUTH) { 362 optlen = (hdr->hdrlen + 2) << 2; 363 } else { 364 optlen = ipv6_optlen(hdr); 365 } 366 if (nexthdr == NEXTHDR_DEST) { 367 __u16 i = off + 2; 368 while (1) { 369 struct ipv6_tlv_tnl_enc_lim *tel; 370 371 /* No more room for encapsulation limit */ 372 if (i + sizeof (*tel) > off + optlen) 373 break; 374 375 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; 376 /* return index of option if found and valid */ 377 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && 378 tel->length == 1) 379 return i; 380 /* else jump to next option */ 381 if (tel->type) 382 i += tel->length + 2; 383 else 384 i++; 385 } 386 } 387 nexthdr = hdr->nexthdr; 388 off += optlen; 389 } 390 return 0; 391 } 392 393 /** 394 * ip6_tnl_err - tunnel error handler 395 * 396 * Description: 397 * ip6_tnl_err() should handle errors in the tunnel according 398 * to the specifications in RFC 2473. 399 **/ 400 401 static int 402 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, 403 u8 *type, u8 *code, int *msg, __u32 *info, int offset) 404 { 405 struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; 406 struct ip6_tnl *t; 407 int rel_msg = 0; 408 u8 rel_type = ICMPV6_DEST_UNREACH; 409 u8 rel_code = ICMPV6_ADDR_UNREACH; 410 __u32 rel_info = 0; 411 __u16 len; 412 int err = -ENOENT; 413 414 /* If the packet doesn't contain the original IPv6 header we are 415 in trouble since we might need the source address for further 416 processing of the error. */ 417 418 rcu_read_lock(); 419 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, 420 &ipv6h->saddr)) == NULL) 421 goto out; 422 423 if (t->parms.proto != ipproto && t->parms.proto != 0) 424 goto out; 425 426 err = 0; 427 428 switch (*type) { 429 __u32 teli; 430 struct ipv6_tlv_tnl_enc_lim *tel; 431 __u32 mtu; 432 case ICMPV6_DEST_UNREACH: 433 if (net_ratelimit()) 434 printk(KERN_WARNING 435 "%s: Path to destination invalid " 436 "or inactive!\n", t->parms.name); 437 rel_msg = 1; 438 break; 439 case ICMPV6_TIME_EXCEED: 440 if ((*code) == ICMPV6_EXC_HOPLIMIT) { 441 if (net_ratelimit()) 442 printk(KERN_WARNING 443 "%s: Too small hop limit or " 444 "routing loop in tunnel!\n", 445 t->parms.name); 446 rel_msg = 1; 447 } 448 break; 449 case ICMPV6_PARAMPROB: 450 teli = 0; 451 if ((*code) == ICMPV6_HDR_FIELD) 452 teli = parse_tlv_tnl_enc_lim(skb, skb->data); 453 454 if (teli && teli == *info - 2) { 455 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 456 if (tel->encap_limit == 0) { 457 if (net_ratelimit()) 458 printk(KERN_WARNING 459 "%s: Too small encapsulation " 460 "limit or routing loop in " 461 "tunnel!\n", t->parms.name); 462 rel_msg = 1; 463 } 464 } else if (net_ratelimit()) { 465 printk(KERN_WARNING 466 "%s: Recipient unable to parse tunneled " 467 "packet!\n ", t->parms.name); 468 } 469 break; 470 case ICMPV6_PKT_TOOBIG: 471 mtu = *info - offset; 472 if (mtu < IPV6_MIN_MTU) 473 mtu = IPV6_MIN_MTU; 474 t->dev->mtu = mtu; 475 476 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { 477 rel_type = ICMPV6_PKT_TOOBIG; 478 rel_code = 0; 479 rel_info = mtu; 480 rel_msg = 1; 481 } 482 break; 483 } 484 485 *type = rel_type; 486 *code = rel_code; 487 *info = rel_info; 488 *msg = rel_msg; 489 490 out: 491 rcu_read_unlock(); 492 return err; 493 } 494 495 static int 496 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 497 u8 type, u8 code, int offset, __be32 info) 498 { 499 int rel_msg = 0; 500 u8 rel_type = type; 501 u8 rel_code = code; 502 __u32 rel_info = ntohl(info); 503 int err; 504 struct sk_buff *skb2; 505 struct iphdr *eiph; 506 struct flowi fl; 507 struct rtable *rt; 508 509 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, 510 &rel_msg, &rel_info, offset); 511 if (err < 0) 512 return err; 513 514 if (rel_msg == 0) 515 return 0; 516 517 switch (rel_type) { 518 case ICMPV6_DEST_UNREACH: 519 if (rel_code != ICMPV6_ADDR_UNREACH) 520 return 0; 521 rel_type = ICMP_DEST_UNREACH; 522 rel_code = ICMP_HOST_UNREACH; 523 break; 524 case ICMPV6_PKT_TOOBIG: 525 if (rel_code != 0) 526 return 0; 527 rel_type = ICMP_DEST_UNREACH; 528 rel_code = ICMP_FRAG_NEEDED; 529 break; 530 default: 531 return 0; 532 } 533 534 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) 535 return 0; 536 537 skb2 = skb_clone(skb, GFP_ATOMIC); 538 if (!skb2) 539 return 0; 540 541 skb_dst_drop(skb2); 542 543 skb_pull(skb2, offset); 544 skb_reset_network_header(skb2); 545 eiph = ip_hdr(skb2); 546 547 /* Try to guess incoming interface */ 548 memset(&fl, 0, sizeof(fl)); 549 fl.fl4_dst = eiph->saddr; 550 fl.fl4_tos = RT_TOS(eiph->tos); 551 fl.proto = IPPROTO_IPIP; 552 if (ip_route_output_key(dev_net(skb->dev), &rt, &fl)) 553 goto out; 554 555 skb2->dev = rt->dst.dev; 556 557 /* route "incoming" packet */ 558 if (rt->rt_flags & RTCF_LOCAL) { 559 ip_rt_put(rt); 560 rt = NULL; 561 fl.fl4_dst = eiph->daddr; 562 fl.fl4_src = eiph->saddr; 563 fl.fl4_tos = eiph->tos; 564 if (ip_route_output_key(dev_net(skb->dev), &rt, &fl) || 565 rt->dst.dev->type != ARPHRD_TUNNEL) { 566 ip_rt_put(rt); 567 goto out; 568 } 569 skb_dst_set(skb2, (struct dst_entry *)rt); 570 } else { 571 ip_rt_put(rt); 572 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, 573 skb2->dev) || 574 skb_dst(skb2)->dev->type != ARPHRD_TUNNEL) 575 goto out; 576 } 577 578 /* change mtu on this route */ 579 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { 580 if (rel_info > dst_mtu(skb_dst(skb2))) 581 goto out; 582 583 skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info); 584 } 585 586 icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); 587 588 out: 589 kfree_skb(skb2); 590 return 0; 591 } 592 593 static int 594 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 595 u8 type, u8 code, int offset, __be32 info) 596 { 597 int rel_msg = 0; 598 u8 rel_type = type; 599 u8 rel_code = code; 600 __u32 rel_info = ntohl(info); 601 int err; 602 603 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, 604 &rel_msg, &rel_info, offset); 605 if (err < 0) 606 return err; 607 608 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { 609 struct rt6_info *rt; 610 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 611 612 if (!skb2) 613 return 0; 614 615 skb_dst_drop(skb2); 616 skb_pull(skb2, offset); 617 skb_reset_network_header(skb2); 618 619 /* Try to guess incoming interface */ 620 rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, 621 NULL, 0, 0); 622 623 if (rt && rt->rt6i_dev) 624 skb2->dev = rt->rt6i_dev; 625 626 icmpv6_send(skb2, rel_type, rel_code, rel_info); 627 628 if (rt) 629 dst_release(&rt->dst); 630 631 kfree_skb(skb2); 632 } 633 634 return 0; 635 } 636 637 static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, 638 struct ipv6hdr *ipv6h, 639 struct sk_buff *skb) 640 { 641 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; 642 643 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 644 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); 645 646 if (INET_ECN_is_ce(dsfield)) 647 IP_ECN_set_ce(ip_hdr(skb)); 648 } 649 650 static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, 651 struct ipv6hdr *ipv6h, 652 struct sk_buff *skb) 653 { 654 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 655 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); 656 657 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) 658 IP6_ECN_set_ce(ipv6_hdr(skb)); 659 } 660 661 /* called with rcu_read_lock() */ 662 static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) 663 { 664 struct ip6_tnl_parm *p = &t->parms; 665 int ret = 0; 666 struct net *net = dev_net(t->dev); 667 668 if (p->flags & IP6_TNL_F_CAP_RCV) { 669 struct net_device *ldev = NULL; 670 671 if (p->link) 672 ldev = dev_get_by_index_rcu(net, p->link); 673 674 if ((ipv6_addr_is_multicast(&p->laddr) || 675 likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) && 676 likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0))) 677 ret = 1; 678 679 } 680 return ret; 681 } 682 683 /** 684 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally 685 * @skb: received socket buffer 686 * @protocol: ethernet protocol ID 687 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN 688 * 689 * Return: 0 690 **/ 691 692 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, 693 __u8 ipproto, 694 void (*dscp_ecn_decapsulate)(struct ip6_tnl *t, 695 struct ipv6hdr *ipv6h, 696 struct sk_buff *skb)) 697 { 698 struct ip6_tnl *t; 699 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 700 701 rcu_read_lock(); 702 703 if ((t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, 704 &ipv6h->daddr)) != NULL) { 705 if (t->parms.proto != ipproto && t->parms.proto != 0) { 706 rcu_read_unlock(); 707 goto discard; 708 } 709 710 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 711 rcu_read_unlock(); 712 goto discard; 713 } 714 715 if (!ip6_tnl_rcv_ctl(t)) { 716 t->dev->stats.rx_dropped++; 717 rcu_read_unlock(); 718 goto discard; 719 } 720 secpath_reset(skb); 721 skb->mac_header = skb->network_header; 722 skb_reset_network_header(skb); 723 skb->protocol = htons(protocol); 724 skb->pkt_type = PACKET_HOST; 725 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 726 727 skb_tunnel_rx(skb, t->dev); 728 729 dscp_ecn_decapsulate(t, ipv6h, skb); 730 netif_rx(skb); 731 rcu_read_unlock(); 732 return 0; 733 } 734 rcu_read_unlock(); 735 return 1; 736 737 discard: 738 kfree_skb(skb); 739 return 0; 740 } 741 742 static int ip4ip6_rcv(struct sk_buff *skb) 743 { 744 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, 745 ip4ip6_dscp_ecn_decapsulate); 746 } 747 748 static int ip6ip6_rcv(struct sk_buff *skb) 749 { 750 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, 751 ip6ip6_dscp_ecn_decapsulate); 752 } 753 754 struct ipv6_tel_txoption { 755 struct ipv6_txoptions ops; 756 __u8 dst_opt[8]; 757 }; 758 759 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) 760 { 761 memset(opt, 0, sizeof(struct ipv6_tel_txoption)); 762 763 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; 764 opt->dst_opt[3] = 1; 765 opt->dst_opt[4] = encap_limit; 766 opt->dst_opt[5] = IPV6_TLV_PADN; 767 opt->dst_opt[6] = 1; 768 769 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; 770 opt->ops.opt_nflen = 8; 771 } 772 773 /** 774 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 775 * @t: the outgoing tunnel device 776 * @hdr: IPv6 header from the incoming packet 777 * 778 * Description: 779 * Avoid trivial tunneling loop by checking that tunnel exit-point 780 * doesn't match source of incoming packet. 781 * 782 * Return: 783 * 1 if conflict, 784 * 0 else 785 **/ 786 787 static inline int 788 ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) 789 { 790 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 791 } 792 793 static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) 794 { 795 struct ip6_tnl_parm *p = &t->parms; 796 int ret = 0; 797 struct net *net = dev_net(t->dev); 798 799 if (p->flags & IP6_TNL_F_CAP_XMIT) { 800 struct net_device *ldev = NULL; 801 802 rcu_read_lock(); 803 if (p->link) 804 ldev = dev_get_by_index_rcu(net, p->link); 805 806 if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0))) 807 printk(KERN_WARNING 808 "%s xmit: Local address not yet configured!\n", 809 p->name); 810 else if (!ipv6_addr_is_multicast(&p->raddr) && 811 unlikely(ipv6_chk_addr(net, &p->raddr, NULL, 0))) 812 printk(KERN_WARNING 813 "%s xmit: Routing loop! " 814 "Remote address found on this node!\n", 815 p->name); 816 else 817 ret = 1; 818 rcu_read_unlock(); 819 } 820 return ret; 821 } 822 /** 823 * ip6_tnl_xmit2 - encapsulate packet and send 824 * @skb: the outgoing socket buffer 825 * @dev: the outgoing tunnel device 826 * @dsfield: dscp code for outer header 827 * @fl: flow of tunneled packet 828 * @encap_limit: encapsulation limit 829 * @pmtu: Path MTU is stored if packet is too big 830 * 831 * Description: 832 * Build new header and do some sanity checks on the packet before sending 833 * it. 834 * 835 * Return: 836 * 0 on success 837 * -1 fail 838 * %-EMSGSIZE message too big. return mtu in this case. 839 **/ 840 841 static int ip6_tnl_xmit2(struct sk_buff *skb, 842 struct net_device *dev, 843 __u8 dsfield, 844 struct flowi *fl, 845 int encap_limit, 846 __u32 *pmtu) 847 { 848 struct net *net = dev_net(dev); 849 struct ip6_tnl *t = netdev_priv(dev); 850 struct net_device_stats *stats = &t->dev->stats; 851 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 852 struct ipv6_tel_txoption opt; 853 struct dst_entry *dst; 854 struct net_device *tdev; 855 int mtu; 856 unsigned int max_headroom = sizeof(struct ipv6hdr); 857 u8 proto; 858 int err = -1; 859 int pkt_len; 860 861 if ((dst = ip6_tnl_dst_check(t)) != NULL) 862 dst_hold(dst); 863 else { 864 dst = ip6_route_output(net, NULL, fl); 865 866 if (dst->error || xfrm_lookup(net, &dst, fl, NULL, 0) < 0) 867 goto tx_err_link_failure; 868 } 869 870 tdev = dst->dev; 871 872 if (tdev == dev) { 873 stats->collisions++; 874 if (net_ratelimit()) 875 printk(KERN_WARNING 876 "%s: Local routing loop detected!\n", 877 t->parms.name); 878 goto tx_err_dst_release; 879 } 880 mtu = dst_mtu(dst) - sizeof (*ipv6h); 881 if (encap_limit >= 0) { 882 max_headroom += 8; 883 mtu -= 8; 884 } 885 if (mtu < IPV6_MIN_MTU) 886 mtu = IPV6_MIN_MTU; 887 if (skb_dst(skb)) 888 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu); 889 if (skb->len > mtu) { 890 *pmtu = mtu; 891 err = -EMSGSIZE; 892 goto tx_err_dst_release; 893 } 894 895 /* 896 * Okay, now see if we can stuff it in the buffer as-is. 897 */ 898 max_headroom += LL_RESERVED_SPACE(tdev); 899 900 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 901 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 902 struct sk_buff *new_skb; 903 904 if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) 905 goto tx_err_dst_release; 906 907 if (skb->sk) 908 skb_set_owner_w(new_skb, skb->sk); 909 kfree_skb(skb); 910 skb = new_skb; 911 } 912 skb_dst_drop(skb); 913 skb_dst_set(skb, dst_clone(dst)); 914 915 skb->transport_header = skb->network_header; 916 917 proto = fl->proto; 918 if (encap_limit >= 0) { 919 init_tel_txopt(&opt, encap_limit); 920 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); 921 } 922 skb_push(skb, sizeof(struct ipv6hdr)); 923 skb_reset_network_header(skb); 924 ipv6h = ipv6_hdr(skb); 925 *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); 926 dsfield = INET_ECN_encapsulate(0, dsfield); 927 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); 928 ipv6h->hop_limit = t->parms.hop_limit; 929 ipv6h->nexthdr = proto; 930 ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); 931 ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); 932 nf_reset(skb); 933 pkt_len = skb->len; 934 err = ip6_local_out(skb); 935 936 if (net_xmit_eval(err) == 0) { 937 stats->tx_bytes += pkt_len; 938 stats->tx_packets++; 939 } else { 940 stats->tx_errors++; 941 stats->tx_aborted_errors++; 942 } 943 ip6_tnl_dst_store(t, dst); 944 return 0; 945 tx_err_link_failure: 946 stats->tx_carrier_errors++; 947 dst_link_failure(skb); 948 tx_err_dst_release: 949 dst_release(dst); 950 return err; 951 } 952 953 static inline int 954 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 955 { 956 struct ip6_tnl *t = netdev_priv(dev); 957 struct iphdr *iph = ip_hdr(skb); 958 int encap_limit = -1; 959 struct flowi fl; 960 __u8 dsfield; 961 __u32 mtu; 962 int err; 963 964 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || 965 !ip6_tnl_xmit_ctl(t)) 966 return -1; 967 968 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 969 encap_limit = t->parms.encap_limit; 970 971 memcpy(&fl, &t->fl, sizeof (fl)); 972 fl.proto = IPPROTO_IPIP; 973 974 dsfield = ipv4_get_dsfield(iph); 975 976 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) 977 fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) 978 & IPV6_TCLASS_MASK; 979 980 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); 981 if (err != 0) { 982 /* XXX: send ICMP error even if DF is not set. */ 983 if (err == -EMSGSIZE) 984 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 985 htonl(mtu)); 986 return -1; 987 } 988 989 return 0; 990 } 991 992 static inline int 993 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 994 { 995 struct ip6_tnl *t = netdev_priv(dev); 996 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 997 int encap_limit = -1; 998 __u16 offset; 999 struct flowi fl; 1000 __u8 dsfield; 1001 __u32 mtu; 1002 int err; 1003 1004 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || 1005 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) 1006 return -1; 1007 1008 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); 1009 if (offset > 0) { 1010 struct ipv6_tlv_tnl_enc_lim *tel; 1011 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 1012 if (tel->encap_limit == 0) { 1013 icmpv6_send(skb, ICMPV6_PARAMPROB, 1014 ICMPV6_HDR_FIELD, offset + 2); 1015 return -1; 1016 } 1017 encap_limit = tel->encap_limit - 1; 1018 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1019 encap_limit = t->parms.encap_limit; 1020 1021 memcpy(&fl, &t->fl, sizeof (fl)); 1022 fl.proto = IPPROTO_IPV6; 1023 1024 dsfield = ipv6_get_dsfield(ipv6h); 1025 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) 1026 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); 1027 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1028 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); 1029 1030 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); 1031 if (err != 0) { 1032 if (err == -EMSGSIZE) 1033 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); 1034 return -1; 1035 } 1036 1037 return 0; 1038 } 1039 1040 static netdev_tx_t 1041 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1042 { 1043 struct ip6_tnl *t = netdev_priv(dev); 1044 struct net_device_stats *stats = &t->dev->stats; 1045 int ret; 1046 1047 switch (skb->protocol) { 1048 case htons(ETH_P_IP): 1049 ret = ip4ip6_tnl_xmit(skb, dev); 1050 break; 1051 case htons(ETH_P_IPV6): 1052 ret = ip6ip6_tnl_xmit(skb, dev); 1053 break; 1054 default: 1055 goto tx_err; 1056 } 1057 1058 if (ret < 0) 1059 goto tx_err; 1060 1061 return NETDEV_TX_OK; 1062 1063 tx_err: 1064 stats->tx_errors++; 1065 stats->tx_dropped++; 1066 kfree_skb(skb); 1067 return NETDEV_TX_OK; 1068 } 1069 1070 static void ip6_tnl_set_cap(struct ip6_tnl *t) 1071 { 1072 struct ip6_tnl_parm *p = &t->parms; 1073 int ltype = ipv6_addr_type(&p->laddr); 1074 int rtype = ipv6_addr_type(&p->raddr); 1075 1076 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); 1077 1078 if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 1079 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 1080 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && 1081 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { 1082 if (ltype&IPV6_ADDR_UNICAST) 1083 p->flags |= IP6_TNL_F_CAP_XMIT; 1084 if (rtype&IPV6_ADDR_UNICAST) 1085 p->flags |= IP6_TNL_F_CAP_RCV; 1086 } 1087 } 1088 1089 static void ip6_tnl_link_config(struct ip6_tnl *t) 1090 { 1091 struct net_device *dev = t->dev; 1092 struct ip6_tnl_parm *p = &t->parms; 1093 struct flowi *fl = &t->fl; 1094 1095 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1096 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1097 1098 /* Set up flowi template */ 1099 ipv6_addr_copy(&fl->fl6_src, &p->laddr); 1100 ipv6_addr_copy(&fl->fl6_dst, &p->raddr); 1101 fl->oif = p->link; 1102 fl->fl6_flowlabel = 0; 1103 1104 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1105 fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1106 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1107 fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1108 1109 ip6_tnl_set_cap(t); 1110 1111 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) 1112 dev->flags |= IFF_POINTOPOINT; 1113 else 1114 dev->flags &= ~IFF_POINTOPOINT; 1115 1116 dev->iflink = p->link; 1117 1118 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1119 int strict = (ipv6_addr_type(&p->raddr) & 1120 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1121 1122 struct rt6_info *rt = rt6_lookup(dev_net(dev), 1123 &p->raddr, &p->laddr, 1124 p->link, strict); 1125 1126 if (rt == NULL) 1127 return; 1128 1129 if (rt->rt6i_dev) { 1130 dev->hard_header_len = rt->rt6i_dev->hard_header_len + 1131 sizeof (struct ipv6hdr); 1132 1133 dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); 1134 1135 if (dev->mtu < IPV6_MIN_MTU) 1136 dev->mtu = IPV6_MIN_MTU; 1137 } 1138 dst_release(&rt->dst); 1139 } 1140 } 1141 1142 /** 1143 * ip6_tnl_change - update the tunnel parameters 1144 * @t: tunnel to be changed 1145 * @p: tunnel configuration parameters 1146 * 1147 * Description: 1148 * ip6_tnl_change() updates the tunnel parameters 1149 **/ 1150 1151 static int 1152 ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) 1153 { 1154 ipv6_addr_copy(&t->parms.laddr, &p->laddr); 1155 ipv6_addr_copy(&t->parms.raddr, &p->raddr); 1156 t->parms.flags = p->flags; 1157 t->parms.hop_limit = p->hop_limit; 1158 t->parms.encap_limit = p->encap_limit; 1159 t->parms.flowinfo = p->flowinfo; 1160 t->parms.link = p->link; 1161 t->parms.proto = p->proto; 1162 ip6_tnl_dst_reset(t); 1163 ip6_tnl_link_config(t); 1164 return 0; 1165 } 1166 1167 /** 1168 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace 1169 * @dev: virtual device associated with tunnel 1170 * @ifr: parameters passed from userspace 1171 * @cmd: command to be performed 1172 * 1173 * Description: 1174 * ip6_tnl_ioctl() is used for managing IPv6 tunnels 1175 * from userspace. 1176 * 1177 * The possible commands are the following: 1178 * %SIOCGETTUNNEL: get tunnel parameters for device 1179 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 1180 * %SIOCCHGTUNNEL: change tunnel parameters to those given 1181 * %SIOCDELTUNNEL: delete tunnel 1182 * 1183 * The fallback device "ip6tnl0", created during module 1184 * initialization, can be used for creating other tunnel devices. 1185 * 1186 * Return: 1187 * 0 on success, 1188 * %-EFAULT if unable to copy data to or from userspace, 1189 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 1190 * %-EINVAL if passed tunnel parameters are invalid, 1191 * %-EEXIST if changing a tunnel's parameters would cause a conflict 1192 * %-ENODEV if attempting to change or delete a nonexisting device 1193 **/ 1194 1195 static int 1196 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1197 { 1198 int err = 0; 1199 struct ip6_tnl_parm p; 1200 struct ip6_tnl *t = NULL; 1201 struct net *net = dev_net(dev); 1202 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1203 1204 switch (cmd) { 1205 case SIOCGETTUNNEL: 1206 if (dev == ip6n->fb_tnl_dev) { 1207 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { 1208 err = -EFAULT; 1209 break; 1210 } 1211 t = ip6_tnl_locate(net, &p, 0); 1212 } 1213 if (t == NULL) 1214 t = netdev_priv(dev); 1215 memcpy(&p, &t->parms, sizeof (p)); 1216 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { 1217 err = -EFAULT; 1218 } 1219 break; 1220 case SIOCADDTUNNEL: 1221 case SIOCCHGTUNNEL: 1222 err = -EPERM; 1223 if (!capable(CAP_NET_ADMIN)) 1224 break; 1225 err = -EFAULT; 1226 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) 1227 break; 1228 err = -EINVAL; 1229 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 1230 p.proto != 0) 1231 break; 1232 t = ip6_tnl_locate(net, &p, cmd == SIOCADDTUNNEL); 1233 if (dev != ip6n->fb_tnl_dev && cmd == SIOCCHGTUNNEL) { 1234 if (t != NULL) { 1235 if (t->dev != dev) { 1236 err = -EEXIST; 1237 break; 1238 } 1239 } else 1240 t = netdev_priv(dev); 1241 1242 ip6_tnl_unlink(ip6n, t); 1243 err = ip6_tnl_change(t, &p); 1244 ip6_tnl_link(ip6n, t); 1245 netdev_state_change(dev); 1246 } 1247 if (t) { 1248 err = 0; 1249 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) 1250 err = -EFAULT; 1251 1252 } else 1253 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1254 break; 1255 case SIOCDELTUNNEL: 1256 err = -EPERM; 1257 if (!capable(CAP_NET_ADMIN)) 1258 break; 1259 1260 if (dev == ip6n->fb_tnl_dev) { 1261 err = -EFAULT; 1262 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) 1263 break; 1264 err = -ENOENT; 1265 if ((t = ip6_tnl_locate(net, &p, 0)) == NULL) 1266 break; 1267 err = -EPERM; 1268 if (t->dev == ip6n->fb_tnl_dev) 1269 break; 1270 dev = t->dev; 1271 } 1272 err = 0; 1273 unregister_netdevice(dev); 1274 break; 1275 default: 1276 err = -EINVAL; 1277 } 1278 return err; 1279 } 1280 1281 /** 1282 * ip6_tnl_change_mtu - change mtu manually for tunnel device 1283 * @dev: virtual device associated with tunnel 1284 * @new_mtu: the new mtu 1285 * 1286 * Return: 1287 * 0 on success, 1288 * %-EINVAL if mtu too small 1289 **/ 1290 1291 static int 1292 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) 1293 { 1294 if (new_mtu < IPV6_MIN_MTU) { 1295 return -EINVAL; 1296 } 1297 dev->mtu = new_mtu; 1298 return 0; 1299 } 1300 1301 1302 static const struct net_device_ops ip6_tnl_netdev_ops = { 1303 .ndo_uninit = ip6_tnl_dev_uninit, 1304 .ndo_start_xmit = ip6_tnl_xmit, 1305 .ndo_do_ioctl = ip6_tnl_ioctl, 1306 .ndo_change_mtu = ip6_tnl_change_mtu, 1307 }; 1308 1309 /** 1310 * ip6_tnl_dev_setup - setup virtual tunnel device 1311 * @dev: virtual device associated with tunnel 1312 * 1313 * Description: 1314 * Initialize function pointers and device parameters 1315 **/ 1316 1317 static void ip6_tnl_dev_setup(struct net_device *dev) 1318 { 1319 dev->netdev_ops = &ip6_tnl_netdev_ops; 1320 dev->destructor = free_netdev; 1321 1322 dev->type = ARPHRD_TUNNEL6; 1323 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); 1324 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); 1325 dev->flags |= IFF_NOARP; 1326 dev->addr_len = sizeof(struct in6_addr); 1327 dev->features |= NETIF_F_NETNS_LOCAL; 1328 } 1329 1330 1331 /** 1332 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices 1333 * @dev: virtual device associated with tunnel 1334 **/ 1335 1336 static inline void 1337 ip6_tnl_dev_init_gen(struct net_device *dev) 1338 { 1339 struct ip6_tnl *t = netdev_priv(dev); 1340 t->dev = dev; 1341 strcpy(t->parms.name, dev->name); 1342 } 1343 1344 /** 1345 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices 1346 * @dev: virtual device associated with tunnel 1347 **/ 1348 1349 static void ip6_tnl_dev_init(struct net_device *dev) 1350 { 1351 struct ip6_tnl *t = netdev_priv(dev); 1352 ip6_tnl_dev_init_gen(dev); 1353 ip6_tnl_link_config(t); 1354 } 1355 1356 /** 1357 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device 1358 * @dev: fallback device 1359 * 1360 * Return: 0 1361 **/ 1362 1363 static void __net_init ip6_fb_tnl_dev_init(struct net_device *dev) 1364 { 1365 struct ip6_tnl *t = netdev_priv(dev); 1366 struct net *net = dev_net(dev); 1367 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1368 1369 ip6_tnl_dev_init_gen(dev); 1370 t->parms.proto = IPPROTO_IPV6; 1371 dev_hold(dev); 1372 ip6n->tnls_wc[0] = t; 1373 } 1374 1375 static struct xfrm6_tunnel ip4ip6_handler = { 1376 .handler = ip4ip6_rcv, 1377 .err_handler = ip4ip6_err, 1378 .priority = 1, 1379 }; 1380 1381 static struct xfrm6_tunnel ip6ip6_handler = { 1382 .handler = ip6ip6_rcv, 1383 .err_handler = ip6ip6_err, 1384 .priority = 1, 1385 }; 1386 1387 static void __net_exit ip6_tnl_destroy_tunnels(struct ip6_tnl_net *ip6n) 1388 { 1389 int h; 1390 struct ip6_tnl *t; 1391 LIST_HEAD(list); 1392 1393 for (h = 0; h < HASH_SIZE; h++) { 1394 t = ip6n->tnls_r_l[h]; 1395 while (t != NULL) { 1396 unregister_netdevice_queue(t->dev, &list); 1397 t = t->next; 1398 } 1399 } 1400 1401 t = ip6n->tnls_wc[0]; 1402 unregister_netdevice_queue(t->dev, &list); 1403 unregister_netdevice_many(&list); 1404 } 1405 1406 static int __net_init ip6_tnl_init_net(struct net *net) 1407 { 1408 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1409 int err; 1410 1411 ip6n->tnls[0] = ip6n->tnls_wc; 1412 ip6n->tnls[1] = ip6n->tnls_r_l; 1413 1414 err = -ENOMEM; 1415 ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", 1416 ip6_tnl_dev_setup); 1417 1418 if (!ip6n->fb_tnl_dev) 1419 goto err_alloc_dev; 1420 dev_net_set(ip6n->fb_tnl_dev, net); 1421 1422 ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev); 1423 1424 err = register_netdev(ip6n->fb_tnl_dev); 1425 if (err < 0) 1426 goto err_register; 1427 return 0; 1428 1429 err_register: 1430 free_netdev(ip6n->fb_tnl_dev); 1431 err_alloc_dev: 1432 return err; 1433 } 1434 1435 static void __net_exit ip6_tnl_exit_net(struct net *net) 1436 { 1437 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); 1438 1439 rtnl_lock(); 1440 ip6_tnl_destroy_tunnels(ip6n); 1441 rtnl_unlock(); 1442 } 1443 1444 static struct pernet_operations ip6_tnl_net_ops = { 1445 .init = ip6_tnl_init_net, 1446 .exit = ip6_tnl_exit_net, 1447 .id = &ip6_tnl_net_id, 1448 .size = sizeof(struct ip6_tnl_net), 1449 }; 1450 1451 /** 1452 * ip6_tunnel_init - register protocol and reserve needed resources 1453 * 1454 * Return: 0 on success 1455 **/ 1456 1457 static int __init ip6_tunnel_init(void) 1458 { 1459 int err; 1460 1461 err = register_pernet_device(&ip6_tnl_net_ops); 1462 if (err < 0) 1463 goto out_pernet; 1464 1465 err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET); 1466 if (err < 0) { 1467 printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); 1468 goto out_ip4ip6; 1469 } 1470 1471 err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6); 1472 if (err < 0) { 1473 printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); 1474 goto out_ip6ip6; 1475 } 1476 1477 return 0; 1478 1479 out_ip6ip6: 1480 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); 1481 out_ip4ip6: 1482 unregister_pernet_device(&ip6_tnl_net_ops); 1483 out_pernet: 1484 return err; 1485 } 1486 1487 /** 1488 * ip6_tunnel_cleanup - free resources and unregister protocol 1489 **/ 1490 1491 static void __exit ip6_tunnel_cleanup(void) 1492 { 1493 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) 1494 printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); 1495 1496 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) 1497 printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); 1498 1499 unregister_pernet_device(&ip6_tnl_net_ops); 1500 } 1501 1502 module_init(ip6_tunnel_init); 1503 module_exit(ip6_tunnel_cleanup); 1504