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(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(&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(&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(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(p->link); 654 655 if ((ipv6_addr_is_multicast(&p->laddr) || 656 likely(ipv6_chk_addr(&p->laddr, ldev, 0))) && 657 likely(!ipv6_chk_addr(&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(p->link); 790 791 if (unlikely(!ipv6_chk_addr(&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(&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 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->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 914 ipv6h->hop_limit = t->parms.hop_limit; 915 ipv6h->nexthdr = proto; 916 ipv6_addr_copy(&ipv6h->saddr, &fl->fl6_src); 917 ipv6_addr_copy(&ipv6h->daddr, &fl->fl6_dst); 918 nf_reset(skb); 919 pkt_len = skb->len; 920 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, 921 skb->dst->dev, dst_output); 922 923 if (net_xmit_eval(err) == 0) { 924 stats->tx_bytes += pkt_len; 925 stats->tx_packets++; 926 } else { 927 stats->tx_errors++; 928 stats->tx_aborted_errors++; 929 } 930 ip6_tnl_dst_store(t, dst); 931 return 0; 932 tx_err_link_failure: 933 stats->tx_carrier_errors++; 934 dst_link_failure(skb); 935 tx_err_dst_release: 936 dst_release(dst); 937 return err; 938 } 939 940 static inline int 941 ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 942 { 943 struct ip6_tnl *t = netdev_priv(dev); 944 struct iphdr *iph = ip_hdr(skb); 945 int encap_limit = -1; 946 struct flowi fl; 947 __u8 dsfield; 948 __u32 mtu; 949 int err; 950 951 if ((t->parms.proto != IPPROTO_IPIP && t->parms.proto != 0) || 952 !ip6_tnl_xmit_ctl(t)) 953 return -1; 954 955 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 956 encap_limit = t->parms.encap_limit; 957 958 memcpy(&fl, &t->fl, sizeof (fl)); 959 fl.proto = IPPROTO_IPIP; 960 961 dsfield = ipv4_get_dsfield(iph); 962 963 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) 964 fl.fl6_flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT) 965 & IPV6_TCLASS_MASK; 966 967 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); 968 if (err != 0) { 969 /* XXX: send ICMP error even if DF is not set. */ 970 if (err == -EMSGSIZE) 971 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, 972 htonl(mtu)); 973 return -1; 974 } 975 976 return 0; 977 } 978 979 static inline int 980 ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 981 { 982 struct ip6_tnl *t = netdev_priv(dev); 983 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 984 int encap_limit = -1; 985 __u16 offset; 986 struct flowi fl; 987 __u8 dsfield; 988 __u32 mtu; 989 int err; 990 991 if ((t->parms.proto != IPPROTO_IPV6 && t->parms.proto != 0) || 992 !ip6_tnl_xmit_ctl(t) || ip6_tnl_addr_conflict(t, ipv6h)) 993 return -1; 994 995 offset = parse_tlv_tnl_enc_lim(skb, skb_network_header(skb)); 996 if (offset > 0) { 997 struct ipv6_tlv_tnl_enc_lim *tel; 998 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset]; 999 if (tel->encap_limit == 0) { 1000 icmpv6_send(skb, ICMPV6_PARAMPROB, 1001 ICMPV6_HDR_FIELD, offset + 2, skb->dev); 1002 return -1; 1003 } 1004 encap_limit = tel->encap_limit - 1; 1005 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) 1006 encap_limit = t->parms.encap_limit; 1007 1008 memcpy(&fl, &t->fl, sizeof (fl)); 1009 fl.proto = IPPROTO_IPV6; 1010 1011 dsfield = ipv6_get_dsfield(ipv6h); 1012 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)) 1013 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK); 1014 if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1015 fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK); 1016 1017 err = ip6_tnl_xmit2(skb, dev, dsfield, &fl, encap_limit, &mtu); 1018 if (err != 0) { 1019 if (err == -EMSGSIZE) 1020 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev); 1021 return -1; 1022 } 1023 1024 return 0; 1025 } 1026 1027 static int 1028 ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) 1029 { 1030 struct ip6_tnl *t = netdev_priv(dev); 1031 struct net_device_stats *stats = &t->stat; 1032 int ret; 1033 1034 if (t->recursion++) { 1035 t->stat.collisions++; 1036 goto tx_err; 1037 } 1038 1039 switch (skb->protocol) { 1040 case __constant_htons(ETH_P_IP): 1041 ret = ip4ip6_tnl_xmit(skb, dev); 1042 break; 1043 case __constant_htons(ETH_P_IPV6): 1044 ret = ip6ip6_tnl_xmit(skb, dev); 1045 break; 1046 default: 1047 goto tx_err; 1048 } 1049 1050 if (ret < 0) 1051 goto tx_err; 1052 1053 t->recursion--; 1054 return 0; 1055 1056 tx_err: 1057 stats->tx_errors++; 1058 stats->tx_dropped++; 1059 kfree_skb(skb); 1060 t->recursion--; 1061 return 0; 1062 } 1063 1064 static void ip6_tnl_set_cap(struct ip6_tnl *t) 1065 { 1066 struct ip6_tnl_parm *p = &t->parms; 1067 int ltype = ipv6_addr_type(&p->laddr); 1068 int rtype = ipv6_addr_type(&p->raddr); 1069 1070 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV); 1071 1072 if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 1073 rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) && 1074 !((ltype|rtype) & IPV6_ADDR_LOOPBACK) && 1075 (!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) { 1076 if (ltype&IPV6_ADDR_UNICAST) 1077 p->flags |= IP6_TNL_F_CAP_XMIT; 1078 if (rtype&IPV6_ADDR_UNICAST) 1079 p->flags |= IP6_TNL_F_CAP_RCV; 1080 } 1081 } 1082 1083 static void ip6_tnl_link_config(struct ip6_tnl *t) 1084 { 1085 struct net_device *dev = t->dev; 1086 struct ip6_tnl_parm *p = &t->parms; 1087 struct flowi *fl = &t->fl; 1088 1089 memcpy(&dev->dev_addr, &p->laddr, sizeof(struct in6_addr)); 1090 memcpy(&dev->broadcast, &p->raddr, sizeof(struct in6_addr)); 1091 1092 /* Set up flowi template */ 1093 ipv6_addr_copy(&fl->fl6_src, &p->laddr); 1094 ipv6_addr_copy(&fl->fl6_dst, &p->raddr); 1095 fl->oif = p->link; 1096 fl->fl6_flowlabel = 0; 1097 1098 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS)) 1099 fl->fl6_flowlabel |= IPV6_TCLASS_MASK & p->flowinfo; 1100 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL)) 1101 fl->fl6_flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo; 1102 1103 ip6_tnl_set_cap(t); 1104 1105 if (p->flags&IP6_TNL_F_CAP_XMIT && p->flags&IP6_TNL_F_CAP_RCV) 1106 dev->flags |= IFF_POINTOPOINT; 1107 else 1108 dev->flags &= ~IFF_POINTOPOINT; 1109 1110 dev->iflink = p->link; 1111 1112 if (p->flags & IP6_TNL_F_CAP_XMIT) { 1113 int strict = (ipv6_addr_type(&p->raddr) & 1114 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)); 1115 1116 struct rt6_info *rt = rt6_lookup(&p->raddr, &p->laddr, 1117 p->link, strict); 1118 1119 if (rt == NULL) 1120 return; 1121 1122 if (rt->rt6i_dev) { 1123 dev->hard_header_len = rt->rt6i_dev->hard_header_len + 1124 sizeof (struct ipv6hdr); 1125 1126 dev->mtu = rt->rt6i_dev->mtu - sizeof (struct ipv6hdr); 1127 1128 if (dev->mtu < IPV6_MIN_MTU) 1129 dev->mtu = IPV6_MIN_MTU; 1130 } 1131 dst_release(&rt->u.dst); 1132 } 1133 } 1134 1135 /** 1136 * ip6_tnl_change - update the tunnel parameters 1137 * @t: tunnel to be changed 1138 * @p: tunnel configuration parameters 1139 * @active: != 0 if tunnel is ready for use 1140 * 1141 * Description: 1142 * ip6_tnl_change() updates the tunnel parameters 1143 **/ 1144 1145 static int 1146 ip6_tnl_change(struct ip6_tnl *t, struct ip6_tnl_parm *p) 1147 { 1148 ipv6_addr_copy(&t->parms.laddr, &p->laddr); 1149 ipv6_addr_copy(&t->parms.raddr, &p->raddr); 1150 t->parms.flags = p->flags; 1151 t->parms.hop_limit = p->hop_limit; 1152 t->parms.encap_limit = p->encap_limit; 1153 t->parms.flowinfo = p->flowinfo; 1154 t->parms.link = p->link; 1155 t->parms.proto = p->proto; 1156 ip6_tnl_dst_reset(t); 1157 ip6_tnl_link_config(t); 1158 return 0; 1159 } 1160 1161 /** 1162 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace 1163 * @dev: virtual device associated with tunnel 1164 * @ifr: parameters passed from userspace 1165 * @cmd: command to be performed 1166 * 1167 * Description: 1168 * ip6_tnl_ioctl() is used for managing IPv6 tunnels 1169 * from userspace. 1170 * 1171 * The possible commands are the following: 1172 * %SIOCGETTUNNEL: get tunnel parameters for device 1173 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters 1174 * %SIOCCHGTUNNEL: change tunnel parameters to those given 1175 * %SIOCDELTUNNEL: delete tunnel 1176 * 1177 * The fallback device "ip6tnl0", created during module 1178 * initialization, can be used for creating other tunnel devices. 1179 * 1180 * Return: 1181 * 0 on success, 1182 * %-EFAULT if unable to copy data to or from userspace, 1183 * %-EPERM if current process hasn't %CAP_NET_ADMIN set 1184 * %-EINVAL if passed tunnel parameters are invalid, 1185 * %-EEXIST if changing a tunnel's parameters would cause a conflict 1186 * %-ENODEV if attempting to change or delete a nonexisting device 1187 **/ 1188 1189 static int 1190 ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1191 { 1192 int err = 0; 1193 struct ip6_tnl_parm p; 1194 struct ip6_tnl *t = NULL; 1195 1196 switch (cmd) { 1197 case SIOCGETTUNNEL: 1198 if (dev == ip6_fb_tnl_dev) { 1199 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) { 1200 err = -EFAULT; 1201 break; 1202 } 1203 t = ip6_tnl_locate(&p, 0); 1204 } 1205 if (t == NULL) 1206 t = netdev_priv(dev); 1207 memcpy(&p, &t->parms, sizeof (p)); 1208 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof (p))) { 1209 err = -EFAULT; 1210 } 1211 break; 1212 case SIOCADDTUNNEL: 1213 case SIOCCHGTUNNEL: 1214 err = -EPERM; 1215 if (!capable(CAP_NET_ADMIN)) 1216 break; 1217 err = -EFAULT; 1218 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) 1219 break; 1220 err = -EINVAL; 1221 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 1222 p.proto != 0) 1223 break; 1224 t = ip6_tnl_locate(&p, cmd == SIOCADDTUNNEL); 1225 if (dev != ip6_fb_tnl_dev && cmd == SIOCCHGTUNNEL) { 1226 if (t != NULL) { 1227 if (t->dev != dev) { 1228 err = -EEXIST; 1229 break; 1230 } 1231 } else 1232 t = netdev_priv(dev); 1233 1234 ip6_tnl_unlink(t); 1235 err = ip6_tnl_change(t, &p); 1236 ip6_tnl_link(t); 1237 netdev_state_change(dev); 1238 } 1239 if (t) { 1240 err = 0; 1241 if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof (p))) 1242 err = -EFAULT; 1243 1244 } else 1245 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT); 1246 break; 1247 case SIOCDELTUNNEL: 1248 err = -EPERM; 1249 if (!capable(CAP_NET_ADMIN)) 1250 break; 1251 1252 if (dev == ip6_fb_tnl_dev) { 1253 err = -EFAULT; 1254 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof (p))) 1255 break; 1256 err = -ENOENT; 1257 if ((t = ip6_tnl_locate(&p, 0)) == NULL) 1258 break; 1259 err = -EPERM; 1260 if (t->dev == ip6_fb_tnl_dev) 1261 break; 1262 dev = t->dev; 1263 } 1264 err = 0; 1265 unregister_netdevice(dev); 1266 break; 1267 default: 1268 err = -EINVAL; 1269 } 1270 return err; 1271 } 1272 1273 /** 1274 * ip6_tnl_get_stats - return the stats for tunnel device 1275 * @dev: virtual device associated with tunnel 1276 * 1277 * Return: stats for device 1278 **/ 1279 1280 static struct net_device_stats * 1281 ip6_tnl_get_stats(struct net_device *dev) 1282 { 1283 return &(((struct ip6_tnl *)netdev_priv(dev))->stat); 1284 } 1285 1286 /** 1287 * ip6_tnl_change_mtu - change mtu manually for tunnel device 1288 * @dev: virtual device associated with tunnel 1289 * @new_mtu: the new mtu 1290 * 1291 * Return: 1292 * 0 on success, 1293 * %-EINVAL if mtu too small 1294 **/ 1295 1296 static int 1297 ip6_tnl_change_mtu(struct net_device *dev, int new_mtu) 1298 { 1299 if (new_mtu < IPV6_MIN_MTU) { 1300 return -EINVAL; 1301 } 1302 dev->mtu = new_mtu; 1303 return 0; 1304 } 1305 1306 /** 1307 * ip6_tnl_dev_setup - setup virtual tunnel device 1308 * @dev: virtual device associated with tunnel 1309 * 1310 * Description: 1311 * Initialize function pointers and device parameters 1312 **/ 1313 1314 static void ip6_tnl_dev_setup(struct net_device *dev) 1315 { 1316 SET_MODULE_OWNER(dev); 1317 dev->uninit = ip6_tnl_dev_uninit; 1318 dev->destructor = free_netdev; 1319 dev->hard_start_xmit = ip6_tnl_xmit; 1320 dev->get_stats = ip6_tnl_get_stats; 1321 dev->do_ioctl = ip6_tnl_ioctl; 1322 dev->change_mtu = ip6_tnl_change_mtu; 1323 1324 dev->type = ARPHRD_TUNNEL6; 1325 dev->hard_header_len = LL_MAX_HEADER + sizeof (struct ipv6hdr); 1326 dev->mtu = ETH_DATA_LEN - sizeof (struct ipv6hdr); 1327 dev->flags |= IFF_NOARP; 1328 dev->addr_len = sizeof(struct in6_addr); 1329 } 1330 1331 1332 /** 1333 * ip6_tnl_dev_init_gen - general initializer for all tunnel devices 1334 * @dev: virtual device associated with tunnel 1335 **/ 1336 1337 static inline void 1338 ip6_tnl_dev_init_gen(struct net_device *dev) 1339 { 1340 struct ip6_tnl *t = netdev_priv(dev); 1341 t->dev = dev; 1342 strcpy(t->parms.name, dev->name); 1343 } 1344 1345 /** 1346 * ip6_tnl_dev_init - initializer for all non fallback tunnel devices 1347 * @dev: virtual device associated with tunnel 1348 **/ 1349 1350 static int 1351 ip6_tnl_dev_init(struct net_device *dev) 1352 { 1353 struct ip6_tnl *t = netdev_priv(dev); 1354 ip6_tnl_dev_init_gen(dev); 1355 ip6_tnl_link_config(t); 1356 return 0; 1357 } 1358 1359 /** 1360 * ip6_fb_tnl_dev_init - initializer for fallback tunnel device 1361 * @dev: fallback device 1362 * 1363 * Return: 0 1364 **/ 1365 1366 static int 1367 ip6_fb_tnl_dev_init(struct net_device *dev) 1368 { 1369 struct ip6_tnl *t = netdev_priv(dev); 1370 ip6_tnl_dev_init_gen(dev); 1371 t->parms.proto = IPPROTO_IPV6; 1372 dev_hold(dev); 1373 tnls_wc[0] = t; 1374 return 0; 1375 } 1376 1377 static struct xfrm6_tunnel ip4ip6_handler = { 1378 .handler = ip4ip6_rcv, 1379 .err_handler = ip4ip6_err, 1380 .priority = 1, 1381 }; 1382 1383 static struct xfrm6_tunnel ip6ip6_handler = { 1384 .handler = ip6ip6_rcv, 1385 .err_handler = ip6ip6_err, 1386 .priority = 1, 1387 }; 1388 1389 /** 1390 * ip6_tunnel_init - register protocol and reserve needed resources 1391 * 1392 * Return: 0 on success 1393 **/ 1394 1395 static int __init ip6_tunnel_init(void) 1396 { 1397 int err; 1398 1399 if (xfrm6_tunnel_register(&ip4ip6_handler, AF_INET)) { 1400 printk(KERN_ERR "ip6_tunnel init: can't register ip4ip6\n"); 1401 err = -EAGAIN; 1402 goto out; 1403 } 1404 1405 if (xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6)) { 1406 printk(KERN_ERR "ip6_tunnel init: can't register ip6ip6\n"); 1407 err = -EAGAIN; 1408 goto unreg_ip4ip6; 1409 } 1410 ip6_fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0", 1411 ip6_tnl_dev_setup); 1412 1413 if (!ip6_fb_tnl_dev) { 1414 err = -ENOMEM; 1415 goto fail; 1416 } 1417 ip6_fb_tnl_dev->init = ip6_fb_tnl_dev_init; 1418 1419 if ((err = register_netdev(ip6_fb_tnl_dev))) { 1420 free_netdev(ip6_fb_tnl_dev); 1421 goto fail; 1422 } 1423 return 0; 1424 fail: 1425 xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6); 1426 unreg_ip4ip6: 1427 xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET); 1428 out: 1429 return err; 1430 } 1431 1432 static void __exit ip6_tnl_destroy_tunnels(void) 1433 { 1434 int h; 1435 struct ip6_tnl *t; 1436 1437 for (h = 0; h < HASH_SIZE; h++) { 1438 while ((t = tnls_r_l[h]) != NULL) 1439 unregister_netdevice(t->dev); 1440 } 1441 1442 t = tnls_wc[0]; 1443 unregister_netdevice(t->dev); 1444 } 1445 1446 /** 1447 * ip6_tunnel_cleanup - free resources and unregister protocol 1448 **/ 1449 1450 static void __exit ip6_tunnel_cleanup(void) 1451 { 1452 if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET)) 1453 printk(KERN_INFO "ip6_tunnel close: can't deregister ip4ip6\n"); 1454 1455 if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6)) 1456 printk(KERN_INFO "ip6_tunnel close: can't deregister ip6ip6\n"); 1457 1458 rtnl_lock(); 1459 ip6_tnl_destroy_tunnels(); 1460 rtnl_unlock(); 1461 } 1462 1463 module_init(ip6_tunnel_init); 1464 module_exit(ip6_tunnel_cleanup); 1465