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 * $Id$ 10 * 11 * Based on: 12 * linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c 13 * 14 * RFC 2473 15 * 16 * This program is free software; you can redistribute it and/or 17 * modify it under the terms of the GNU General Public License 18 * as published by the Free Software Foundation; either version 19 * 2 of the License, or (at your option) any later version. 20 * 21 */ 22 23 #include <linux/module.h> 24 #include <linux/capability.h> 25 #include <linux/errno.h> 26 #include <linux/types.h> 27 #include <linux/sockios.h> 28 #include <linux/icmp.h> 29 #include <linux/if.h> 30 #include <linux/in.h> 31 #include <linux/ip.h> 32 #include <linux/if_tunnel.h> 33 #include <linux/net.h> 34 #include <linux/in6.h> 35 #include <linux/netdevice.h> 36 #include <linux/if_arp.h> 37 #include <linux/icmpv6.h> 38 #include <linux/init.h> 39 #include <linux/route.h> 40 #include <linux/rtnetlink.h> 41 #include <linux/netfilter_ipv6.h> 42 43 #include <asm/uaccess.h> 44 #include <asm/atomic.h> 45 46 #include <net/icmp.h> 47 #include <net/ip.h> 48 #include <net/ipv6.h> 49 #include <net/ip6_route.h> 50 #include <net/addrconf.h> 51 #include <net/ip6_tunnel.h> 52 #include <net/xfrm.h> 53 #include <net/dsfield.h> 54 #include <net/inet_ecn.h> 55 56 MODULE_AUTHOR("Ville Nuorvala"); 57 MODULE_DESCRIPTION("IPv6 tunneling device"); 58 MODULE_LICENSE("GPL"); 59 60 #define IPV6_TLV_TEL_DST_SIZE 8 61 62 #ifdef IP6_TNL_DEBUG 63 #define IP6_TNL_TRACE(x...) printk(KERN_DEBUG "%s:" x "\n", __FUNCTION__) 64 #else 65 #define IP6_TNL_TRACE(x...) do {;} while(0) 66 #endif 67 68 #define IPV6_TCLASS_MASK (IPV6_FLOWINFO_MASK & ~IPV6_FLOWLABEL_MASK) 69 #define IPV6_TCLASS_SHIFT 20 70 71 #define HASH_SIZE 32 72 73 #define HASH(addr) ((__force u32)((addr)->s6_addr32[0] ^ (addr)->s6_addr32[1] ^ \ 74 (addr)->s6_addr32[2] ^ (addr)->s6_addr32[3]) & \ 75 (HASH_SIZE - 1)) 76 77 static int ip6_fb_tnl_dev_init(struct net_device *dev); 78 static int ip6_tnl_dev_init(struct net_device *dev); 79 static void ip6_tnl_dev_setup(struct net_device *dev); 80 81 /* the IPv6 tunnel fallback device */ 82 static struct net_device *ip6_fb_tnl_dev; 83 84 85 /* lists for storing tunnels in use */ 86 static struct ip6_tnl *tnls_r_l[HASH_SIZE]; 87 static struct ip6_tnl *tnls_wc[1]; 88 static struct ip6_tnl **tnls[2] = { tnls_wc, tnls_r_l }; 89 90 /* lock for the tunnel lists */ 91 static DEFINE_RWLOCK(ip6_tnl_lock); 92 93 static inline struct dst_entry *ip6_tnl_dst_check(struct ip6_tnl *t) 94 { 95 struct dst_entry *dst = t->dst_cache; 96 97 if (dst && dst->obsolete && 98 dst->ops->check(dst, t->dst_cookie) == NULL) { 99 t->dst_cache = NULL; 100 dst_release(dst); 101 return NULL; 102 } 103 104 return dst; 105 } 106 107 static inline void ip6_tnl_dst_reset(struct ip6_tnl *t) 108 { 109 dst_release(t->dst_cache); 110 t->dst_cache = NULL; 111 } 112 113 static inline void ip6_tnl_dst_store(struct ip6_tnl *t, struct dst_entry *dst) 114 { 115 struct rt6_info *rt = (struct rt6_info *) dst; 116 t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; 117 dst_release(t->dst_cache); 118 t->dst_cache = dst; 119 } 120 121 /** 122 * ip6_tnl_lookup - fetch tunnel matching the end-point addresses 123 * @remote: the address of the tunnel exit-point 124 * @local: the address of the tunnel entry-point 125 * 126 * Return: 127 * tunnel matching given end-points if found, 128 * else fallback tunnel if its device is up, 129 * else %NULL 130 **/ 131 132 static struct ip6_tnl * 133 ip6_tnl_lookup(struct in6_addr *remote, struct in6_addr *local) 134 { 135 unsigned h0 = HASH(remote); 136 unsigned h1 = HASH(local); 137 struct ip6_tnl *t; 138 139 for (t = tnls_r_l[h0 ^ h1]; t; t = t->next) { 140 if (ipv6_addr_equal(local, &t->parms.laddr) && 141 ipv6_addr_equal(remote, &t->parms.raddr) && 142 (t->dev->flags & IFF_UP)) 143 return t; 144 } 145 if ((t = tnls_wc[0]) != NULL && (t->dev->flags & IFF_UP)) 146 return t; 147 148 return NULL; 149 } 150 151 /** 152 * ip6_tnl_bucket - get head of list matching given tunnel parameters 153 * @p: parameters containing tunnel end-points 154 * 155 * Description: 156 * ip6_tnl_bucket() returns the head of the list matching the 157 * &struct in6_addr entries laddr and raddr in @p. 158 * 159 * Return: head of IPv6 tunnel list 160 **/ 161 162 static struct ip6_tnl ** 163 ip6_tnl_bucket(struct ip6_tnl_parm *p) 164 { 165 struct in6_addr *remote = &p->raddr; 166 struct in6_addr *local = &p->laddr; 167 unsigned h = 0; 168 int prio = 0; 169 170 if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) { 171 prio = 1; 172 h = HASH(remote) ^ HASH(local); 173 } 174 return &tnls[prio][h]; 175 } 176 177 /** 178 * ip6_tnl_link - add tunnel to hash table 179 * @t: tunnel to be added 180 **/ 181 182 static void 183 ip6_tnl_link(struct ip6_tnl *t) 184 { 185 struct ip6_tnl **tp = ip6_tnl_bucket(&t->parms); 186 187 t->next = *tp; 188 write_lock_bh(&ip6_tnl_lock); 189 *tp = t; 190 write_unlock_bh(&ip6_tnl_lock); 191 } 192 193 /** 194 * ip6_tnl_unlink - remove tunnel from hash table 195 * @t: tunnel to be removed 196 **/ 197 198 static void 199 ip6_tnl_unlink(struct ip6_tnl *t) 200 { 201 struct ip6_tnl **tp; 202 203 for (tp = ip6_tnl_bucket(&t->parms); *tp; tp = &(*tp)->next) { 204 if (t == *tp) { 205 write_lock_bh(&ip6_tnl_lock); 206 *tp = t->next; 207 write_unlock_bh(&ip6_tnl_lock); 208 break; 209 } 210 } 211 } 212 213 /** 214 * ip6_tnl_create() - create a new tunnel 215 * @p: tunnel parameters 216 * @pt: pointer to new tunnel 217 * 218 * Description: 219 * Create tunnel matching given parameters. 220 * 221 * Return: 222 * created tunnel or NULL 223 **/ 224 225 static struct ip6_tnl *ip6_tnl_create(struct ip6_tnl_parm *p) 226 { 227 struct net_device *dev; 228 struct ip6_tnl *t; 229 char name[IFNAMSIZ]; 230 int err; 231 232 if (p->name[0]) { 233 strlcpy(name, p->name, IFNAMSIZ); 234 } else { 235 int i; 236 for (i = 1; i < IP6_TNL_MAX; i++) { 237 sprintf(name, "ip6tnl%d", i); 238 if (__dev_get_by_name(&init_net, name) == NULL) 239 break; 240 } 241 if (i == IP6_TNL_MAX) 242 goto failed; 243 } 244 dev = alloc_netdev(sizeof (*t), name, ip6_tnl_dev_setup); 245 if (dev == NULL) 246 goto failed; 247 248 t = netdev_priv(dev); 249 dev->init = ip6_tnl_dev_init; 250 t->parms = *p; 251 252 if ((err = register_netdevice(dev)) < 0) { 253 free_netdev(dev); 254 goto failed; 255 } 256 dev_hold(dev); 257 ip6_tnl_link(t); 258 return t; 259 failed: 260 return NULL; 261 } 262 263 /** 264 * ip6_tnl_locate - find or create tunnel matching given parameters 265 * @p: tunnel parameters 266 * @create: != 0 if allowed to create new tunnel if no match found 267 * 268 * Description: 269 * ip6_tnl_locate() first tries to locate an existing tunnel 270 * based on @parms. If this is unsuccessful, but @create is set a new 271 * tunnel device is created and registered for use. 272 * 273 * Return: 274 * matching tunnel or NULL 275 **/ 276 277 static struct ip6_tnl *ip6_tnl_locate(struct ip6_tnl_parm *p, int create) 278 { 279 struct in6_addr *remote = &p->raddr; 280 struct in6_addr *local = &p->laddr; 281 struct ip6_tnl *t; 282 283 for (t = *ip6_tnl_bucket(p); t; t = t->next) { 284 if (ipv6_addr_equal(local, &t->parms.laddr) && 285 ipv6_addr_equal(remote, &t->parms.raddr)) 286 return t; 287 } 288 if (!create) 289 return NULL; 290 return ip6_tnl_create(p); 291 } 292 293 /** 294 * ip6_tnl_dev_uninit - tunnel device uninitializer 295 * @dev: the device to be destroyed 296 * 297 * Description: 298 * ip6_tnl_dev_uninit() removes tunnel from its list 299 **/ 300 301 static void 302 ip6_tnl_dev_uninit(struct net_device *dev) 303 { 304 struct ip6_tnl *t = netdev_priv(dev); 305 306 if (dev == ip6_fb_tnl_dev) { 307 write_lock_bh(&ip6_tnl_lock); 308 tnls_wc[0] = NULL; 309 write_unlock_bh(&ip6_tnl_lock); 310 } else { 311 ip6_tnl_unlink(t); 312 } 313 ip6_tnl_dst_reset(t); 314 dev_put(dev); 315 } 316 317 /** 318 * parse_tvl_tnl_enc_lim - handle encapsulation limit option 319 * @skb: received socket buffer 320 * 321 * Return: 322 * 0 if none was found, 323 * else index to encapsulation limit 324 **/ 325 326 static __u16 327 parse_tlv_tnl_enc_lim(struct sk_buff *skb, __u8 * raw) 328 { 329 struct ipv6hdr *ipv6h = (struct ipv6hdr *) raw; 330 __u8 nexthdr = ipv6h->nexthdr; 331 __u16 off = sizeof (*ipv6h); 332 333 while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { 334 __u16 optlen = 0; 335 struct ipv6_opt_hdr *hdr; 336 if (raw + off + sizeof (*hdr) > skb->data && 337 !pskb_may_pull(skb, raw - skb->data + off + sizeof (*hdr))) 338 break; 339 340 hdr = (struct ipv6_opt_hdr *) (raw + off); 341 if (nexthdr == NEXTHDR_FRAGMENT) { 342 struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; 343 if (frag_hdr->frag_off) 344 break; 345 optlen = 8; 346 } else if (nexthdr == NEXTHDR_AUTH) { 347 optlen = (hdr->hdrlen + 2) << 2; 348 } else { 349 optlen = ipv6_optlen(hdr); 350 } 351 if (nexthdr == NEXTHDR_DEST) { 352 __u16 i = off + 2; 353 while (1) { 354 struct ipv6_tlv_tnl_enc_lim *tel; 355 356 /* No more room for encapsulation limit */ 357 if (i + sizeof (*tel) > off + optlen) 358 break; 359 360 tel = (struct ipv6_tlv_tnl_enc_lim *) &raw[i]; 361 /* return index of option if found and valid */ 362 if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT && 363 tel->length == 1) 364 return i; 365 /* else jump to next option */ 366 if (tel->type) 367 i += tel->length + 2; 368 else 369 i++; 370 } 371 } 372 nexthdr = hdr->nexthdr; 373 off += optlen; 374 } 375 return 0; 376 } 377 378 /** 379 * ip6_tnl_err - tunnel error handler 380 * 381 * Description: 382 * ip6_tnl_err() should handle errors in the tunnel according 383 * to the specifications in RFC 2473. 384 **/ 385 386 static int 387 ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt, 388 int *type, int *code, int *msg, __u32 *info, int offset) 389 { 390 struct ipv6hdr *ipv6h = (struct ipv6hdr *) skb->data; 391 struct ip6_tnl *t; 392 int rel_msg = 0; 393 int rel_type = ICMPV6_DEST_UNREACH; 394 int rel_code = ICMPV6_ADDR_UNREACH; 395 __u32 rel_info = 0; 396 __u16 len; 397 int err = -ENOENT; 398 399 /* If the packet doesn't contain the original IPv6 header we are 400 in trouble since we might need the source address for further 401 processing of the error. */ 402 403 read_lock(&ip6_tnl_lock); 404 if ((t = ip6_tnl_lookup(&ipv6h->daddr, &ipv6h->saddr)) == NULL) 405 goto out; 406 407 if (t->parms.proto != ipproto && t->parms.proto != 0) 408 goto out; 409 410 err = 0; 411 412 switch (*type) { 413 __u32 teli; 414 struct ipv6_tlv_tnl_enc_lim *tel; 415 __u32 mtu; 416 case ICMPV6_DEST_UNREACH: 417 if (net_ratelimit()) 418 printk(KERN_WARNING 419 "%s: Path to destination invalid " 420 "or inactive!\n", t->parms.name); 421 rel_msg = 1; 422 break; 423 case ICMPV6_TIME_EXCEED: 424 if ((*code) == ICMPV6_EXC_HOPLIMIT) { 425 if (net_ratelimit()) 426 printk(KERN_WARNING 427 "%s: Too small hop limit or " 428 "routing loop in tunnel!\n", 429 t->parms.name); 430 rel_msg = 1; 431 } 432 break; 433 case ICMPV6_PARAMPROB: 434 teli = 0; 435 if ((*code) == ICMPV6_HDR_FIELD) 436 teli = parse_tlv_tnl_enc_lim(skb, skb->data); 437 438 if (teli && teli == *info - 2) { 439 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli]; 440 if (tel->encap_limit == 0) { 441 if (net_ratelimit()) 442 printk(KERN_WARNING 443 "%s: Too small encapsulation " 444 "limit or routing loop in " 445 "tunnel!\n", t->parms.name); 446 rel_msg = 1; 447 } 448 } else if (net_ratelimit()) { 449 printk(KERN_WARNING 450 "%s: Recipient unable to parse tunneled " 451 "packet!\n ", t->parms.name); 452 } 453 break; 454 case ICMPV6_PKT_TOOBIG: 455 mtu = *info - offset; 456 if (mtu < IPV6_MIN_MTU) 457 mtu = IPV6_MIN_MTU; 458 t->dev->mtu = mtu; 459 460 if ((len = sizeof (*ipv6h) + ntohs(ipv6h->payload_len)) > mtu) { 461 rel_type = ICMPV6_PKT_TOOBIG; 462 rel_code = 0; 463 rel_info = mtu; 464 rel_msg = 1; 465 } 466 break; 467 } 468 469 *type = rel_type; 470 *code = rel_code; 471 *info = rel_info; 472 *msg = rel_msg; 473 474 out: 475 read_unlock(&ip6_tnl_lock); 476 return err; 477 } 478 479 static int 480 ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 481 int type, int code, int offset, __be32 info) 482 { 483 int rel_msg = 0; 484 int rel_type = type; 485 int rel_code = code; 486 __u32 rel_info = ntohl(info); 487 int err; 488 struct sk_buff *skb2; 489 struct iphdr *eiph; 490 struct flowi fl; 491 struct rtable *rt; 492 493 err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code, 494 &rel_msg, &rel_info, offset); 495 if (err < 0) 496 return err; 497 498 if (rel_msg == 0) 499 return 0; 500 501 switch (rel_type) { 502 case ICMPV6_DEST_UNREACH: 503 if (rel_code != ICMPV6_ADDR_UNREACH) 504 return 0; 505 rel_type = ICMP_DEST_UNREACH; 506 rel_code = ICMP_HOST_UNREACH; 507 break; 508 case ICMPV6_PKT_TOOBIG: 509 if (rel_code != 0) 510 return 0; 511 rel_type = ICMP_DEST_UNREACH; 512 rel_code = ICMP_FRAG_NEEDED; 513 break; 514 default: 515 return 0; 516 } 517 518 if (!pskb_may_pull(skb, offset + sizeof(struct iphdr))) 519 return 0; 520 521 skb2 = skb_clone(skb, GFP_ATOMIC); 522 if (!skb2) 523 return 0; 524 525 dst_release(skb2->dst); 526 skb2->dst = NULL; 527 skb_pull(skb2, offset); 528 skb_reset_network_header(skb2); 529 eiph = ip_hdr(skb2); 530 531 /* Try to guess incoming interface */ 532 memset(&fl, 0, sizeof(fl)); 533 fl.fl4_dst = eiph->saddr; 534 fl.fl4_tos = RT_TOS(eiph->tos); 535 fl.proto = IPPROTO_IPIP; 536 if (ip_route_output_key(&init_net, &rt, &fl)) 537 goto out; 538 539 skb2->dev = rt->u.dst.dev; 540 541 /* route "incoming" packet */ 542 if (rt->rt_flags & RTCF_LOCAL) { 543 ip_rt_put(rt); 544 rt = NULL; 545 fl.fl4_dst = eiph->daddr; 546 fl.fl4_src = eiph->saddr; 547 fl.fl4_tos = eiph->tos; 548 if (ip_route_output_key(&init_net, &rt, &fl) || 549 rt->u.dst.dev->type != ARPHRD_TUNNEL) { 550 ip_rt_put(rt); 551 goto out; 552 } 553 } else { 554 ip_rt_put(rt); 555 if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos, 556 skb2->dev) || 557 skb2->dst->dev->type != ARPHRD_TUNNEL) 558 goto out; 559 } 560 561 /* change mtu on this route */ 562 if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) { 563 if (rel_info > dst_mtu(skb2->dst)) 564 goto out; 565 566 skb2->dst->ops->update_pmtu(skb2->dst, rel_info); 567 } 568 569 icmp_send(skb2, rel_type, rel_code, htonl(rel_info)); 570 571 out: 572 kfree_skb(skb2); 573 return 0; 574 } 575 576 static int 577 ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, 578 int type, int code, int offset, __be32 info) 579 { 580 int rel_msg = 0; 581 int rel_type = type; 582 int rel_code = code; 583 __u32 rel_info = ntohl(info); 584 int err; 585 586 err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code, 587 &rel_msg, &rel_info, offset); 588 if (err < 0) 589 return err; 590 591 if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) { 592 struct rt6_info *rt; 593 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 594 595 if (!skb2) 596 return 0; 597 598 dst_release(skb2->dst); 599 skb2->dst = NULL; 600 skb_pull(skb2, offset); 601 skb_reset_network_header(skb2); 602 603 /* Try to guess incoming interface */ 604 rt = rt6_lookup(&ipv6_hdr(skb2)->saddr, NULL, 0, 0); 605 606 if (rt && rt->rt6i_dev) 607 skb2->dev = rt->rt6i_dev; 608 609 icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev); 610 611 if (rt) 612 dst_release(&rt->u.dst); 613 614 kfree_skb(skb2); 615 } 616 617 return 0; 618 } 619 620 static void ip4ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, 621 struct ipv6hdr *ipv6h, 622 struct sk_buff *skb) 623 { 624 __u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK; 625 626 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 627 ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield); 628 629 if (INET_ECN_is_ce(dsfield)) 630 IP_ECN_set_ce(ip_hdr(skb)); 631 } 632 633 static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, 634 struct ipv6hdr *ipv6h, 635 struct sk_buff *skb) 636 { 637 if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY) 638 ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb)); 639 640 if (INET_ECN_is_ce(ipv6_get_dsfield(ipv6h))) 641 IP6_ECN_set_ce(ipv6_hdr(skb)); 642 } 643 644 static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) 645 { 646 struct ip6_tnl_parm *p = &t->parms; 647 int ret = 0; 648 649 if (p->flags & IP6_TNL_F_CAP_RCV) { 650 struct net_device *ldev = NULL; 651 652 if (p->link) 653 ldev = dev_get_by_index(&init_net, p->link); 654 655 if ((ipv6_addr_is_multicast(&p->laddr) || 656 likely(ipv6_chk_addr(&init_net, &p->laddr, ldev, 0))) && 657 likely(!ipv6_chk_addr(&init_net, &p->raddr, NULL, 0))) 658 ret = 1; 659 660 if (ldev) 661 dev_put(ldev); 662 } 663 return ret; 664 } 665 666 /** 667 * ip6_tnl_rcv - decapsulate IPv6 packet and retransmit it locally 668 * @skb: received socket buffer 669 * @protocol: ethernet protocol ID 670 * @dscp_ecn_decapsulate: the function to decapsulate DSCP code and ECN 671 * 672 * Return: 0 673 **/ 674 675 static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol, 676 __u8 ipproto, 677 void (*dscp_ecn_decapsulate)(struct ip6_tnl *t, 678 struct ipv6hdr *ipv6h, 679 struct sk_buff *skb)) 680 { 681 struct ip6_tnl *t; 682 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 683 684 read_lock(&ip6_tnl_lock); 685 686 if ((t = ip6_tnl_lookup(&ipv6h->saddr, &ipv6h->daddr)) != NULL) { 687 if (t->parms.proto != ipproto && t->parms.proto != 0) { 688 read_unlock(&ip6_tnl_lock); 689 goto discard; 690 } 691 692 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { 693 read_unlock(&ip6_tnl_lock); 694 goto discard; 695 } 696 697 if (!ip6_tnl_rcv_ctl(t)) { 698 t->stat.rx_dropped++; 699 read_unlock(&ip6_tnl_lock); 700 goto discard; 701 } 702 secpath_reset(skb); 703 skb->mac_header = skb->network_header; 704 skb_reset_network_header(skb); 705 skb->protocol = htons(protocol); 706 skb->pkt_type = PACKET_HOST; 707 memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); 708 skb->dev = t->dev; 709 dst_release(skb->dst); 710 skb->dst = NULL; 711 nf_reset(skb); 712 713 dscp_ecn_decapsulate(t, ipv6h, skb); 714 715 t->stat.rx_packets++; 716 t->stat.rx_bytes += skb->len; 717 netif_rx(skb); 718 read_unlock(&ip6_tnl_lock); 719 return 0; 720 } 721 read_unlock(&ip6_tnl_lock); 722 return 1; 723 724 discard: 725 kfree_skb(skb); 726 return 0; 727 } 728 729 static int ip4ip6_rcv(struct sk_buff *skb) 730 { 731 return ip6_tnl_rcv(skb, ETH_P_IP, IPPROTO_IPIP, 732 ip4ip6_dscp_ecn_decapsulate); 733 } 734 735 static int ip6ip6_rcv(struct sk_buff *skb) 736 { 737 return ip6_tnl_rcv(skb, ETH_P_IPV6, IPPROTO_IPV6, 738 ip6ip6_dscp_ecn_decapsulate); 739 } 740 741 struct ipv6_tel_txoption { 742 struct ipv6_txoptions ops; 743 __u8 dst_opt[8]; 744 }; 745 746 static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit) 747 { 748 memset(opt, 0, sizeof(struct ipv6_tel_txoption)); 749 750 opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT; 751 opt->dst_opt[3] = 1; 752 opt->dst_opt[4] = encap_limit; 753 opt->dst_opt[5] = IPV6_TLV_PADN; 754 opt->dst_opt[6] = 1; 755 756 opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt; 757 opt->ops.opt_nflen = 8; 758 } 759 760 /** 761 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own 762 * @t: the outgoing tunnel device 763 * @hdr: IPv6 header from the incoming packet 764 * 765 * Description: 766 * Avoid trivial tunneling loop by checking that tunnel exit-point 767 * doesn't match source of incoming packet. 768 * 769 * Return: 770 * 1 if conflict, 771 * 0 else 772 **/ 773 774 static inline int 775 ip6_tnl_addr_conflict(struct ip6_tnl *t, struct ipv6hdr *hdr) 776 { 777 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr); 778 } 779 780 static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) 781 { 782 struct ip6_tnl_parm *p = &t->parms; 783 int ret = 0; 784 785 if (p->flags & IP6_TNL_F_CAP_XMIT) { 786 struct net_device *ldev = NULL; 787 788 if (p->link) 789 ldev = dev_get_by_index(&init_net, p->link); 790 791 if (unlikely(!ipv6_chk_addr(&init_net, &p->laddr, ldev, 0))) 792 printk(KERN_WARNING 793 "%s xmit: Local address not yet configured!\n", 794 p->name); 795 else if (!ipv6_addr_is_multicast(&p->raddr) && 796 unlikely(ipv6_chk_addr(&init_net, &p->raddr, NULL, 0))) 797 printk(KERN_WARNING 798 "%s xmit: Routing loop! " 799 "Remote address found on this node!\n", 800 p->name); 801 else 802 ret = 1; 803 if (ldev) 804 dev_put(ldev); 805 } 806 return ret; 807 } 808 /** 809 * ip6_tnl_xmit2 - encapsulate packet and send 810 * @skb: the outgoing socket buffer 811 * @dev: the outgoing tunnel device 812 * @dsfield: dscp code for outer header 813 * @fl: flow of tunneled packet 814 * @encap_limit: encapsulation limit 815 * @pmtu: Path MTU is stored if packet is too big 816 * 817 * Description: 818 * Build new header and do some sanity checks on the packet before sending 819 * it. 820 * 821 * Return: 822 * 0 on success 823 * -1 fail 824 * %-EMSGSIZE message too big. return mtu in this case. 825 **/ 826 827 static int ip6_tnl_xmit2(struct sk_buff *skb, 828 struct net_device *dev, 829 __u8 dsfield, 830 struct flowi *fl, 831 int encap_limit, 832 __u32 *pmtu) 833 { 834 struct ip6_tnl *t = netdev_priv(dev); 835 struct net_device_stats *stats = &t->stat; 836 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 837 struct ipv6_tel_txoption opt; 838 struct dst_entry *dst; 839 struct net_device *tdev; 840 int mtu; 841 unsigned int max_headroom = sizeof(struct ipv6hdr); 842 u8 proto; 843 int err = -1; 844 int pkt_len; 845 846 if ((dst = ip6_tnl_dst_check(t)) != NULL) 847 dst_hold(dst); 848 else { 849 dst = ip6_route_output(NULL, fl); 850 851 if (dst->error || xfrm_lookup(&dst, fl, NULL, 0) < 0) 852 goto tx_err_link_failure; 853 } 854 855 tdev = dst->dev; 856 857 if (tdev == dev) { 858 stats->collisions++; 859 if (net_ratelimit()) 860 printk(KERN_WARNING 861 "%s: Local routing loop detected!\n", 862 t->parms.name); 863 goto tx_err_dst_release; 864 } 865 mtu = dst_mtu(dst) - sizeof (*ipv6h); 866 if (encap_limit >= 0) { 867 max_headroom += 8; 868 mtu -= 8; 869 } 870 if (mtu < IPV6_MIN_MTU) 871 mtu = IPV6_MIN_MTU; 872 if (skb->dst) 873 skb->dst->ops->update_pmtu(skb->dst, mtu); 874 if (skb->len > mtu) { 875 *pmtu = mtu; 876 err = -EMSGSIZE; 877 goto tx_err_dst_release; 878 } 879 880 /* 881 * Okay, now see if we can stuff it in the buffer as-is. 882 */ 883 max_headroom += LL_RESERVED_SPACE(tdev); 884 885 if (skb_headroom(skb) < max_headroom || skb_shared(skb) || 886 (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { 887 struct sk_buff *new_skb; 888 889 if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) 890 goto tx_err_dst_release; 891 892 if (skb->sk) 893 skb_set_owner_w(new_skb, skb->sk); 894 kfree_skb(skb); 895 skb = new_skb; 896 } 897 dst_release(skb->dst); 898 skb->dst = dst_clone(dst); 899 900 skb->transport_header = skb->network_header; 901 902 proto = fl->proto; 903 if (encap_limit >= 0) { 904 init_tel_txopt(&opt, encap_limit); 905 ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); 906 } 907 skb_push(skb, sizeof(struct ipv6hdr)); 908 skb_reset_network_header(skb); 909 ipv6h = ipv6_hdr(skb); 910 *(__be32*)ipv6h = fl->fl6_flowlabel | htonl(0x60000000); 911 dsfield = INET_ECN_encapsulate(0, dsfield); 912 ipv6_change_dsfield(ipv6h, ~INET_ECN_MASK, dsfield); 913 ipv6h->hop_limit = t->parms.hop_limit; 914 ipv6h->nexthdr = proto; 915 ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); 916 ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); 917 nf_reset(skb); 918 pkt_len = skb->len; 919 err = ip6_local_out(skb); 920 921 if (net_xmit_eval(err) == 0) { 922 stats->tx_bytes += pkt_len; 923 stats->tx_packets++; 924 } else { 925 stats->tx_errors++; 926 stats->tx_aborted_errors++; 927 } 928 ip6_tnl_dst_store(t, dst); 929 return 0; 930 tx_err_link_failure: 931 stats->tx_carrier_errors++; 932 dst_link_failure(skb); 933 tx_err_dst_release: 934 dst_release(dst); 935 return err; 936 } 937 938 static inline int 939 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 940 { 941 struct ip6_tnl *t = netdev_priv(dev); 942 struct iphdr *iph = ip_hdr(skb); 943 int encap_limit = -1; 944 struct flowi fl; 945 __u8 dsfield; 946 __u32 mtu; 947 int err; 948 949 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || 950 !ip6_tnl_xmit_ctl(t)) 951 return -1; 952 953 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 954 encap_limit = t->parms.encap_limit; 955 956 memcpy(&fl, &t->fl, sizeof (fl)); 957 fl.proto = IPPROTO_IPIP; 958 959 dsfield = ipv4_get_dsfield(iph); 960 961 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) 962 fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) 963 & IPV6_TCLASS_MASK; 964 965 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); 966 if (err != 0) { 967 /* XXX: send ICMP error even if DF is not set. */ 968 if (err == -EMSGSIZE) 969 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 970 htonl(mtu)); 971 return -1; 972 } 973 974 return 0; 975 } 976 977 static inline int 978 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 979 { 980 struct ip6_tnl *t = netdev_priv(dev); 981 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 982 int encap_limit = -1; 983 __u16 offset; 984 struct flowi fl; 985 __u8 dsfield; 986 __u32 mtu; 987 int err; 988 989 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || 990 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) 991 return -1; 992 993 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); 994 if (offset > 0) { 995 struct ipv6_tlv_tnl_enc_lim *tel; 996 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 997 if (tel->encap_limit == 0) { 998 icmpv6_send(skb, ICMPV6_PARAMPROB, 999 ICMPV6_HDR_FIELD, offset + 2, skb->dev); 1000 return -1; 1001 } 1002 encap_limit = tel->encap_limit - 1; 1003 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1004 encap_limit = t->parms.encap_limit; 1005 1006 memcpy(&fl, &t->fl, sizeof (fl)); 1007 fl.proto = IPPROTO_IPV6; 1008 1009 dsfield = ipv6_get_dsfield(ipv6h); 1010 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) 1011 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); 1012 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1013 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); 1014 1015 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); 1016 if (err != 0) { 1017 if (err == -EMSGSIZE) 1018 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); 1019 return -1; 1020 } 1021 1022 return 0; 1023 } 1024 1025 static int 1026 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1027 { 1028 struct ip6_tnl *t = netdev_priv(dev); 1029 struct net_device_stats *stats = &t->stat; 1030 int ret; 1031 1032 if (t->recursion++) { 1033 t->stat.collisions++; 1034 goto tx_err; 1035 } 1036 1037 switch (skb->protocol) { 1038 case __constant_htons(ETH_P_IP): 1039 ret = ip4ip6_tnl_xmit(skb, dev); 1040 break; 1041 case __constant_htons(ETH_P_IPV6): 1042 ret = ip6ip6_tnl_xmit(skb, dev); 1043 break; 1044 default: 1045 goto tx_err; 1046 } 1047 1048 if (ret < 0) 1049 goto tx_err; 1050 1051 t->recursion--; 1052 return 0; 1053 1054 tx_err: 1055 stats->tx_errors++; 1056 stats->tx_dropped++; 1057 kfree_skb(skb); 1058 t->recursion--; 1059 return 0; 1060 } 1061 1062 static void ip6_tnl_set_cap(struct ip6_tnl *t) 1063 { 1064 struct ip6_tnl_parm *p = &t->parms; 1065 int ltype = ipv6_addr_type(&p->laddr); 1066 int rtype = ipv6_addr_type(&p->raddr); 1067 1068 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); 1069 1070 if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 1071 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 1072 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && 1073 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { 1074 if (ltype&IPV6_ADDR_UNICAST) 1075 p->flags |= IP6_TNL_F_CAP_XMIT; 1076 if (rtype&IPV6_ADDR_UNICAST) 1077 p->flags |= IP6_TNL_F_CAP_RCV; 1078 } 1079 } 1080 1081 static void ip6_tnl_link_config(struct ip6_tnl *t) 1082 { 1083 struct net_device *dev = t->dev; 1084 struct ip6_tnl_parm *p = &t->parms; 1085 struct flowi *fl = &t->fl; 1086 1087 memcpy(&dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1088 memcpy(&dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1089 1090 /* Set up flowi template */ 1091 ipv6_addr_copy(&fl->fl6_src, &p->laddr); 1092 ipv6_addr_copy(&fl->fl6_dst, &p->raddr); 1093 fl->oif = p->link; 1094 fl->fl6_flowlabel = 0; 1095 1096 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1097 fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1098 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1099 fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1100 1101 ip6_tnl_set_cap(t); 1102 1103 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) 1104 dev->flags |= IFF_POINTOPOINT; 1105 else 1106 dev->flags &= ~IFF_POINTOPOINT; 1107 1108 dev->iflink = p->link; 1109 1110 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1111 int strict = (ipv6_addr_type(&p->raddr) & 1112 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1113 1114 struct rt6_info *rt = rt6_lookup(&p->raddr, &p->laddr, 1115 p->link, strict); 1116 1117 if (rt == NULL) 1118 return; 1119 1120 if (rt->rt6i_dev) { 1121 dev->hard_header_len = rt->rt6i_dev->hard_header_len + 1122 sizeof (struct ipv6hdr); 1123 1124 dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); 1125 1126 if (dev->mtu < IPV6_MIN_MTU) 1127 dev->mtu = IPV6_MIN_MTU; 1128 } 1129 dst_release(&rt->u.dst); 1130 } 1131 } 1132 1133 /** 1134 * ip6_tnl_change - update the tunnel parameters 1135 * @t: tunnel to be changed 1136 * @p: tunnel configuration parameters 1137 * @active: != 0 if tunnel is ready for use 1138 * 1139 * Description: 1140 * ip6_tnl_change() updates the tunnel parameters 1141 **/ 1142 1143 static int 1144 ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) 1145 { 1146 ipv6_addr_copy(&t->parms.laddr, &p->laddr); 1147 ipv6_addr_copy(&t->parms.raddr, &p->raddr); 1148 t->parms.flags = p->flags; 1149 t->parms.hop_limit = p->hop_limit; 1150 t->parms.encap_limit = p->encap_limit; 1151 t->parms.flowinfo = p->flowinfo; 1152 t->parms.link = p->link; 1153 t->parms.proto = p->proto; 1154 ip6_tnl_dst_reset(t); 1155 ip6_tnl_link_config(t); 1156 return 0; 1157 } 1158 1159 /** 1160 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace 1161 * @dev: virtual device associated with tunnel 1162 * @ifr: parameters passed from userspace 1163 * @cmd: command to be performed 1164 * 1165 * Description: 1166 * ip6_tnl_ioctl() is used for managing IPv6 tunnels 1167 * from userspace. 1168 * 1169 * The possible commands are the following: 1170 * %SIOCGETTUNNEL: get tunnel parameters for device 1171 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 1172 * %SIOCCHGTUNNEL: change tunnel parameters to those given 1173 * %SIOCDELTUNNEL: delete tunnel 1174 * 1175 * The fallback device "ip6tnl0", created during module 1176 * initialization, can be used for creating other tunnel devices. 1177 * 1178 * Return: 1179 * 0 on success, 1180 * %-EFAULT if unable to copy data to or from userspace, 1181 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 1182 * %-EINVAL if passed tunnel parameters are invalid, 1183 * %-EEXIST if changing a tunnel's parameters would cause a conflict 1184 * %-ENODEV if attempting to change or delete a nonexisting device 1185 **/ 1186 1187 static int 1188 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1189 { 1190 int err = 0; 1191 struct ip6_tnl_parm p; 1192 struct ip6_tnl *t = NULL; 1193 1194 switch (cmd) { 1195 case SIOCGETTUNNEL: 1196 if (dev == ip6_fb_tnl_dev) { 1197 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { 1198 err = -EFAULT; 1199 break; 1200 } 1201 t = ip6_tnl_locate(&p, 0); 1202 } 1203 if (t == NULL) 1204 t = netdev_priv(dev); 1205 memcpy(&p, &t->parms, sizeof (p)); 1206 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { 1207 err = -EFAULT; 1208 } 1209 break; 1210 case SIOCADDTUNNEL: 1211 case SIOCCHGTUNNEL: 1212 err = -EPERM; 1213 if (!capable(CAP_NET_ADMIN)) 1214 break; 1215 err = -EFAULT; 1216 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) 1217 break; 1218 err = -EINVAL; 1219 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 1220 p.proto != 0) 1221 break; 1222 t = ip6_tnl_locate(&p, cmd == SIOCADDTUNNEL); 1223 if (dev != ip6_fb_tnl_dev && cmd == SIOCCHGTUNNEL) { 1224 if (t != NULL) { 1225 if (t->dev != dev) { 1226 err = -EEXIST; 1227 break; 1228 } 1229 } else 1230 t = netdev_priv(dev); 1231 1232 ip6_tnl_unlink(t); 1233 err = ip6_tnl_change(t, &p); 1234 ip6_tnl_link(t); 1235 netdev_state_change(dev); 1236 } 1237 if (t) { 1238 err = 0; 1239 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) 1240 err = -EFAULT; 1241 1242 } else 1243 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1244 break; 1245 case SIOCDELTUNNEL: 1246 err = -EPERM; 1247 if (!capable(CAP_NET_ADMIN)) 1248 break; 1249 1250 if (dev == ip6_fb_tnl_dev) { 1251 err = -EFAULT; 1252 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) 1253 break; 1254 err = -ENOENT; 1255 if ((t = ip6_tnl_locate(&p, 0)) == NULL) 1256 break; 1257 err = -EPERM; 1258 if (t->dev == ip6_fb_tnl_dev) 1259 break; 1260 dev = t->dev; 1261 } 1262 err = 0; 1263 unregister_netdevice(dev); 1264 break; 1265 default: 1266 err = -EINVAL; 1267 } 1268 return err; 1269 } 1270 1271 /** 1272 * ip6_tnl_get_stats - return the stats for tunnel device 1273 * @dev: virtual device associated with tunnel 1274 * 1275 * Return: stats for device 1276 **/ 1277 1278 static struct net_device_stats * 1279 ip6_tnl_get_stats(struct net_device *dev) 1280 { 1281 return &(((struct ip6_tnl *)netdev_priv(dev))->stat); 1282 } 1283 1284 /** 1285 * ip6_tnl_change_mtu - change mtu manually for tunnel device 1286 * @dev: virtual device associated with tunnel 1287 * @new_mtu: the new mtu 1288 * 1289 * Return: 1290 * 0 on success, 1291 * %-EINVAL if mtu too small 1292 **/ 1293 1294 static int 1295 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) 1296 { 1297 if (new_mtu < IPV6_MIN_MTU) { 1298 return -EINVAL; 1299 } 1300 dev->mtu = new_mtu; 1301 return 0; 1302 } 1303 1304 /** 1305 * ip6_tnl_dev_setup - setup virtual tunnel device 1306 * @dev: virtual device associated with tunnel 1307 * 1308 * Description: 1309 * Initialize function pointers and device parameters 1310 **/ 1311 1312 static void ip6_tnl_dev_setup(struct net_device *dev) 1313 { 1314 dev->uninit = ip6_tnl_dev_uninit; 1315 dev->destructor = free_netdev; 1316 dev->hard_start_xmit = ip6_tnl_xmit; 1317 dev->get_stats = ip6_tnl_get_stats; 1318 dev->do_ioctl = ip6_tnl_ioctl; 1319 dev->change_mtu = ip6_tnl_change_mtu; 1320 1321 dev->type = ARPHRD_TUNNEL6; 1322 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); 1323 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); 1324 dev->flags |= IFF_NOARP; 1325 dev->addr_len = sizeof(struct in6_addr); 1326 } 1327 1328 1329 /** 1330 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices 1331 * @dev: virtual device associated with tunnel 1332 **/ 1333 1334 static inline void 1335 ip6_tnl_dev_init_gen(struct net_device *dev) 1336 { 1337 struct ip6_tnl *t = netdev_priv(dev); 1338 t->dev = dev; 1339 strcpy(t->parms.name, dev->name); 1340 } 1341 1342 /** 1343 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices 1344 * @dev: virtual device associated with tunnel 1345 **/ 1346 1347 static int 1348 ip6_tnl_dev_init(struct net_device *dev) 1349 { 1350 struct ip6_tnl *t = netdev_priv(dev); 1351 ip6_tnl_dev_init_gen(dev); 1352 ip6_tnl_link_config(t); 1353 return 0; 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 int 1364 ip6_fb_tnl_dev_init(struct net_device *dev) 1365 { 1366 struct ip6_tnl *t = netdev_priv(dev); 1367 ip6_tnl_dev_init_gen(dev); 1368 t->parms.proto = IPPROTO_IPV6; 1369 dev_hold(dev); 1370 tnls_wc[0] = t; 1371 return 0; 1372 } 1373 1374 static struct xfrm6_tunnel ip4ip6_handler = { 1375 .handler = ip4ip6_rcv, 1376 .err_handler = ip4ip6_err, 1377 .priority = 1, 1378 }; 1379 1380 static struct xfrm6_tunnel ip6ip6_handler = { 1381 .handler = ip6ip6_rcv, 1382 .err_handler = ip6ip6_err, 1383 .priority = 1, 1384 }; 1385 1386 /** 1387 * ip6_tunnel_init - register protocol and reserve needed resources 1388 * 1389 * Return: 0 on success 1390 **/ 1391 1392 static int __init ip6_tunnel_init(void) 1393 { 1394 int err; 1395 1396 if (xfrm6_tunnel_register(&ip4ip6_handler, AF_INET)) { 1397 printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); 1398 err = -EAGAIN; 1399 goto out; 1400 } 1401 1402 if (xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6)) { 1403 printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); 1404 err = -EAGAIN; 1405 goto unreg_ip4ip6; 1406 } 1407 ip6_fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", 1408 ip6_tnl_dev_setup); 1409 1410 if (!ip6_fb_tnl_dev) { 1411 err = -ENOMEM; 1412 goto fail; 1413 } 1414 ip6_fb_tnl_dev->init = ip6_fb_tnl_dev_init; 1415 1416 if ((err = register_netdev(ip6_fb_tnl_dev))) { 1417 free_netdev(ip6_fb_tnl_dev); 1418 goto fail; 1419 } 1420 return 0; 1421 fail: 1422 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); 1423 unreg_ip4ip6: 1424 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); 1425 out: 1426 return err; 1427 } 1428 1429 static void __exit ip6_tnl_destroy_tunnels(void) 1430 { 1431 int h; 1432 struct ip6_tnl *t; 1433 1434 for (h = 0; h < HASH_SIZE; h++) { 1435 while ((t = tnls_r_l[h]) != NULL) 1436 unregister_netdevice(t->dev); 1437 } 1438 1439 t = tnls_wc[0]; 1440 unregister_netdevice(t->dev); 1441 } 1442 1443 /** 1444 * ip6_tunnel_cleanup - free resources and unregister protocol 1445 **/ 1446 1447 static void __exit ip6_tunnel_cleanup(void) 1448 { 1449 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) 1450 printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); 1451 1452 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) 1453 printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); 1454 1455 rtnl_lock(); 1456 ip6_tnl_destroy_tunnels(); 1457 rtnl_unlock(); 1458 } 1459 1460 module_init(ip6_tunnel_init); 1461 module_exit(ip6_tunnel_cleanup); 1462