1 /* 2 * Linux IPv6 multicast routing support for BSD pim6sd 3 * Based on net/ipv4/ipmr.c. 4 * 5 * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr> 6 * LSIIT Laboratory, Strasbourg, France 7 * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com> 8 * 6WIND, Paris, France 9 * Copyright (C)2007,2008 USAGI/WIDE Project 10 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 * 17 */ 18 19 #include <asm/system.h> 20 #include <asm/uaccess.h> 21 #include <linux/types.h> 22 #include <linux/sched.h> 23 #include <linux/errno.h> 24 #include <linux/timer.h> 25 #include <linux/mm.h> 26 #include <linux/kernel.h> 27 #include <linux/fcntl.h> 28 #include <linux/stat.h> 29 #include <linux/socket.h> 30 #include <linux/inet.h> 31 #include <linux/netdevice.h> 32 #include <linux/inetdevice.h> 33 #include <linux/proc_fs.h> 34 #include <linux/seq_file.h> 35 #include <linux/init.h> 36 #include <linux/slab.h> 37 #include <net/protocol.h> 38 #include <linux/skbuff.h> 39 #include <net/sock.h> 40 #include <net/raw.h> 41 #include <linux/notifier.h> 42 #include <linux/if_arp.h> 43 #include <net/checksum.h> 44 #include <net/netlink.h> 45 #include <net/fib_rules.h> 46 47 #include <net/ipv6.h> 48 #include <net/ip6_route.h> 49 #include <linux/mroute6.h> 50 #include <linux/pim.h> 51 #include <net/addrconf.h> 52 #include <linux/netfilter_ipv6.h> 53 #include <net/ip6_checksum.h> 54 55 struct mr6_table { 56 struct list_head list; 57 #ifdef CONFIG_NET_NS 58 struct net *net; 59 #endif 60 u32 id; 61 struct sock *mroute6_sk; 62 struct timer_list ipmr_expire_timer; 63 struct list_head mfc6_unres_queue; 64 struct list_head mfc6_cache_array[MFC6_LINES]; 65 struct mif_device vif6_table[MAXMIFS]; 66 int maxvif; 67 atomic_t cache_resolve_queue_len; 68 int mroute_do_assert; 69 int mroute_do_pim; 70 #ifdef CONFIG_IPV6_PIMSM_V2 71 int mroute_reg_vif_num; 72 #endif 73 }; 74 75 struct ip6mr_rule { 76 struct fib_rule common; 77 }; 78 79 struct ip6mr_result { 80 struct mr6_table *mrt; 81 }; 82 83 /* Big lock, protecting vif table, mrt cache and mroute socket state. 84 Note that the changes are semaphored via rtnl_lock. 85 */ 86 87 static DEFINE_RWLOCK(mrt_lock); 88 89 /* 90 * Multicast router control variables 91 */ 92 93 #define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL) 94 95 /* Special spinlock for queue of unresolved entries */ 96 static DEFINE_SPINLOCK(mfc_unres_lock); 97 98 /* We return to original Alan's scheme. Hash table of resolved 99 entries is changed only in process context and protected 100 with weak lock mrt_lock. Queue of unresolved entries is protected 101 with strong spinlock mfc_unres_lock. 102 103 In this case data path is free of exclusive locks at all. 104 */ 105 106 static struct kmem_cache *mrt_cachep __read_mostly; 107 108 static struct mr6_table *ip6mr_new_table(struct net *net, u32 id); 109 static void ip6mr_free_table(struct mr6_table *mrt); 110 111 static int ip6_mr_forward(struct net *net, struct mr6_table *mrt, 112 struct sk_buff *skb, struct mfc6_cache *cache); 113 static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt, 114 mifi_t mifi, int assert); 115 static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, 116 struct mfc6_cache *c, struct rtmsg *rtm); 117 static int ip6mr_rtm_dumproute(struct sk_buff *skb, 118 struct netlink_callback *cb); 119 static void mroute_clean_tables(struct mr6_table *mrt); 120 static void ipmr_expire_process(unsigned long arg); 121 122 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES 123 #define ip6mr_for_each_table(mrt, net) \ 124 list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list) 125 126 static struct mr6_table *ip6mr_get_table(struct net *net, u32 id) 127 { 128 struct mr6_table *mrt; 129 130 ip6mr_for_each_table(mrt, net) { 131 if (mrt->id == id) 132 return mrt; 133 } 134 return NULL; 135 } 136 137 static int ip6mr_fib_lookup(struct net *net, struct flowi *flp, 138 struct mr6_table **mrt) 139 { 140 struct ip6mr_result res; 141 struct fib_lookup_arg arg = { .result = &res, }; 142 int err; 143 144 err = fib_rules_lookup(net->ipv6.mr6_rules_ops, flp, 0, &arg); 145 if (err < 0) 146 return err; 147 *mrt = res.mrt; 148 return 0; 149 } 150 151 static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp, 152 int flags, struct fib_lookup_arg *arg) 153 { 154 struct ip6mr_result *res = arg->result; 155 struct mr6_table *mrt; 156 157 switch (rule->action) { 158 case FR_ACT_TO_TBL: 159 break; 160 case FR_ACT_UNREACHABLE: 161 return -ENETUNREACH; 162 case FR_ACT_PROHIBIT: 163 return -EACCES; 164 case FR_ACT_BLACKHOLE: 165 default: 166 return -EINVAL; 167 } 168 169 mrt = ip6mr_get_table(rule->fr_net, rule->table); 170 if (mrt == NULL) 171 return -EAGAIN; 172 res->mrt = mrt; 173 return 0; 174 } 175 176 static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags) 177 { 178 return 1; 179 } 180 181 static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = { 182 FRA_GENERIC_POLICY, 183 }; 184 185 static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, 186 struct fib_rule_hdr *frh, struct nlattr **tb) 187 { 188 return 0; 189 } 190 191 static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, 192 struct nlattr **tb) 193 { 194 return 1; 195 } 196 197 static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, 198 struct fib_rule_hdr *frh) 199 { 200 frh->dst_len = 0; 201 frh->src_len = 0; 202 frh->tos = 0; 203 return 0; 204 } 205 206 static const struct fib_rules_ops __net_initdata ip6mr_rules_ops_template = { 207 .family = RTNL_FAMILY_IP6MR, 208 .rule_size = sizeof(struct ip6mr_rule), 209 .addr_size = sizeof(struct in6_addr), 210 .action = ip6mr_rule_action, 211 .match = ip6mr_rule_match, 212 .configure = ip6mr_rule_configure, 213 .compare = ip6mr_rule_compare, 214 .default_pref = fib_default_rule_pref, 215 .fill = ip6mr_rule_fill, 216 .nlgroup = RTNLGRP_IPV6_RULE, 217 .policy = ip6mr_rule_policy, 218 .owner = THIS_MODULE, 219 }; 220 221 static int __net_init ip6mr_rules_init(struct net *net) 222 { 223 struct fib_rules_ops *ops; 224 struct mr6_table *mrt; 225 int err; 226 227 ops = fib_rules_register(&ip6mr_rules_ops_template, net); 228 if (IS_ERR(ops)) 229 return PTR_ERR(ops); 230 231 INIT_LIST_HEAD(&net->ipv6.mr6_tables); 232 233 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT); 234 if (mrt == NULL) { 235 err = -ENOMEM; 236 goto err1; 237 } 238 239 err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0); 240 if (err < 0) 241 goto err2; 242 243 net->ipv6.mr6_rules_ops = ops; 244 return 0; 245 246 err2: 247 kfree(mrt); 248 err1: 249 fib_rules_unregister(ops); 250 return err; 251 } 252 253 static void __net_exit ip6mr_rules_exit(struct net *net) 254 { 255 struct mr6_table *mrt, *next; 256 257 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) { 258 list_del(&mrt->list); 259 ip6mr_free_table(mrt); 260 } 261 fib_rules_unregister(net->ipv6.mr6_rules_ops); 262 } 263 #else 264 #define ip6mr_for_each_table(mrt, net) \ 265 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL) 266 267 static struct mr6_table *ip6mr_get_table(struct net *net, u32 id) 268 { 269 return net->ipv6.mrt6; 270 } 271 272 static int ip6mr_fib_lookup(struct net *net, struct flowi *flp, 273 struct mr6_table **mrt) 274 { 275 *mrt = net->ipv6.mrt6; 276 return 0; 277 } 278 279 static int __net_init ip6mr_rules_init(struct net *net) 280 { 281 net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT); 282 return net->ipv6.mrt6 ? 0 : -ENOMEM; 283 } 284 285 static void __net_exit ip6mr_rules_exit(struct net *net) 286 { 287 ip6mr_free_table(net->ipv6.mrt6); 288 } 289 #endif 290 291 static struct mr6_table *ip6mr_new_table(struct net *net, u32 id) 292 { 293 struct mr6_table *mrt; 294 unsigned int i; 295 296 mrt = ip6mr_get_table(net, id); 297 if (mrt != NULL) 298 return mrt; 299 300 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); 301 if (mrt == NULL) 302 return NULL; 303 mrt->id = id; 304 write_pnet(&mrt->net, net); 305 306 /* Forwarding cache */ 307 for (i = 0; i < MFC6_LINES; i++) 308 INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]); 309 310 INIT_LIST_HEAD(&mrt->mfc6_unres_queue); 311 312 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, 313 (unsigned long)mrt); 314 315 #ifdef CONFIG_IPV6_PIMSM_V2 316 mrt->mroute_reg_vif_num = -1; 317 #endif 318 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES 319 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables); 320 #endif 321 return mrt; 322 } 323 324 static void ip6mr_free_table(struct mr6_table *mrt) 325 { 326 del_timer(&mrt->ipmr_expire_timer); 327 mroute_clean_tables(mrt); 328 kfree(mrt); 329 } 330 331 #ifdef CONFIG_PROC_FS 332 333 struct ipmr_mfc_iter { 334 struct seq_net_private p; 335 struct mr6_table *mrt; 336 struct list_head *cache; 337 int ct; 338 }; 339 340 341 static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net, 342 struct ipmr_mfc_iter *it, loff_t pos) 343 { 344 struct mr6_table *mrt = it->mrt; 345 struct mfc6_cache *mfc; 346 347 read_lock(&mrt_lock); 348 for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) { 349 it->cache = &mrt->mfc6_cache_array[it->ct]; 350 list_for_each_entry(mfc, it->cache, list) 351 if (pos-- == 0) 352 return mfc; 353 } 354 read_unlock(&mrt_lock); 355 356 spin_lock_bh(&mfc_unres_lock); 357 it->cache = &mrt->mfc6_unres_queue; 358 list_for_each_entry(mfc, it->cache, list) 359 if (pos-- == 0) 360 return mfc; 361 spin_unlock_bh(&mfc_unres_lock); 362 363 it->cache = NULL; 364 return NULL; 365 } 366 367 /* 368 * The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif 369 */ 370 371 struct ipmr_vif_iter { 372 struct seq_net_private p; 373 struct mr6_table *mrt; 374 int ct; 375 }; 376 377 static struct mif_device *ip6mr_vif_seq_idx(struct net *net, 378 struct ipmr_vif_iter *iter, 379 loff_t pos) 380 { 381 struct mr6_table *mrt = iter->mrt; 382 383 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { 384 if (!MIF_EXISTS(mrt, iter->ct)) 385 continue; 386 if (pos-- == 0) 387 return &mrt->vif6_table[iter->ct]; 388 } 389 return NULL; 390 } 391 392 static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) 393 __acquires(mrt_lock) 394 { 395 struct ipmr_vif_iter *iter = seq->private; 396 struct net *net = seq_file_net(seq); 397 struct mr6_table *mrt; 398 399 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); 400 if (mrt == NULL) 401 return ERR_PTR(-ENOENT); 402 403 iter->mrt = mrt; 404 405 read_lock(&mrt_lock); 406 return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1) 407 : SEQ_START_TOKEN; 408 } 409 410 static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) 411 { 412 struct ipmr_vif_iter *iter = seq->private; 413 struct net *net = seq_file_net(seq); 414 struct mr6_table *mrt = iter->mrt; 415 416 ++*pos; 417 if (v == SEQ_START_TOKEN) 418 return ip6mr_vif_seq_idx(net, iter, 0); 419 420 while (++iter->ct < mrt->maxvif) { 421 if (!MIF_EXISTS(mrt, iter->ct)) 422 continue; 423 return &mrt->vif6_table[iter->ct]; 424 } 425 return NULL; 426 } 427 428 static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) 429 __releases(mrt_lock) 430 { 431 read_unlock(&mrt_lock); 432 } 433 434 static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) 435 { 436 struct ipmr_vif_iter *iter = seq->private; 437 struct mr6_table *mrt = iter->mrt; 438 439 if (v == SEQ_START_TOKEN) { 440 seq_puts(seq, 441 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); 442 } else { 443 const struct mif_device *vif = v; 444 const char *name = vif->dev ? vif->dev->name : "none"; 445 446 seq_printf(seq, 447 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", 448 vif - mrt->vif6_table, 449 name, vif->bytes_in, vif->pkt_in, 450 vif->bytes_out, vif->pkt_out, 451 vif->flags); 452 } 453 return 0; 454 } 455 456 static const struct seq_operations ip6mr_vif_seq_ops = { 457 .start = ip6mr_vif_seq_start, 458 .next = ip6mr_vif_seq_next, 459 .stop = ip6mr_vif_seq_stop, 460 .show = ip6mr_vif_seq_show, 461 }; 462 463 static int ip6mr_vif_open(struct inode *inode, struct file *file) 464 { 465 return seq_open_net(inode, file, &ip6mr_vif_seq_ops, 466 sizeof(struct ipmr_vif_iter)); 467 } 468 469 static const struct file_operations ip6mr_vif_fops = { 470 .owner = THIS_MODULE, 471 .open = ip6mr_vif_open, 472 .read = seq_read, 473 .llseek = seq_lseek, 474 .release = seq_release_net, 475 }; 476 477 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) 478 { 479 struct ipmr_mfc_iter *it = seq->private; 480 struct net *net = seq_file_net(seq); 481 struct mr6_table *mrt; 482 483 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); 484 if (mrt == NULL) 485 return ERR_PTR(-ENOENT); 486 487 it->mrt = mrt; 488 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) 489 : SEQ_START_TOKEN; 490 } 491 492 static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 493 { 494 struct mfc6_cache *mfc = v; 495 struct ipmr_mfc_iter *it = seq->private; 496 struct net *net = seq_file_net(seq); 497 struct mr6_table *mrt = it->mrt; 498 499 ++*pos; 500 501 if (v == SEQ_START_TOKEN) 502 return ipmr_mfc_seq_idx(net, seq->private, 0); 503 504 if (mfc->list.next != it->cache) 505 return list_entry(mfc->list.next, struct mfc6_cache, list); 506 507 if (it->cache == &mrt->mfc6_unres_queue) 508 goto end_of_list; 509 510 BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]); 511 512 while (++it->ct < MFC6_LINES) { 513 it->cache = &mrt->mfc6_cache_array[it->ct]; 514 if (list_empty(it->cache)) 515 continue; 516 return list_first_entry(it->cache, struct mfc6_cache, list); 517 } 518 519 /* exhausted cache_array, show unresolved */ 520 read_unlock(&mrt_lock); 521 it->cache = &mrt->mfc6_unres_queue; 522 it->ct = 0; 523 524 spin_lock_bh(&mfc_unres_lock); 525 if (!list_empty(it->cache)) 526 return list_first_entry(it->cache, struct mfc6_cache, list); 527 528 end_of_list: 529 spin_unlock_bh(&mfc_unres_lock); 530 it->cache = NULL; 531 532 return NULL; 533 } 534 535 static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) 536 { 537 struct ipmr_mfc_iter *it = seq->private; 538 struct mr6_table *mrt = it->mrt; 539 540 if (it->cache == &mrt->mfc6_unres_queue) 541 spin_unlock_bh(&mfc_unres_lock); 542 else if (it->cache == mrt->mfc6_cache_array) 543 read_unlock(&mrt_lock); 544 } 545 546 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) 547 { 548 int n; 549 550 if (v == SEQ_START_TOKEN) { 551 seq_puts(seq, 552 "Group " 553 "Origin " 554 "Iif Pkts Bytes Wrong Oifs\n"); 555 } else { 556 const struct mfc6_cache *mfc = v; 557 const struct ipmr_mfc_iter *it = seq->private; 558 struct mr6_table *mrt = it->mrt; 559 560 seq_printf(seq, "%pI6 %pI6 %-3hd", 561 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin, 562 mfc->mf6c_parent); 563 564 if (it->cache != &mrt->mfc6_unres_queue) { 565 seq_printf(seq, " %8lu %8lu %8lu", 566 mfc->mfc_un.res.pkt, 567 mfc->mfc_un.res.bytes, 568 mfc->mfc_un.res.wrong_if); 569 for (n = mfc->mfc_un.res.minvif; 570 n < mfc->mfc_un.res.maxvif; n++) { 571 if (MIF_EXISTS(mrt, n) && 572 mfc->mfc_un.res.ttls[n] < 255) 573 seq_printf(seq, 574 " %2d:%-3d", 575 n, mfc->mfc_un.res.ttls[n]); 576 } 577 } else { 578 /* unresolved mfc_caches don't contain 579 * pkt, bytes and wrong_if values 580 */ 581 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); 582 } 583 seq_putc(seq, '\n'); 584 } 585 return 0; 586 } 587 588 static const struct seq_operations ipmr_mfc_seq_ops = { 589 .start = ipmr_mfc_seq_start, 590 .next = ipmr_mfc_seq_next, 591 .stop = ipmr_mfc_seq_stop, 592 .show = ipmr_mfc_seq_show, 593 }; 594 595 static int ipmr_mfc_open(struct inode *inode, struct file *file) 596 { 597 return seq_open_net(inode, file, &ipmr_mfc_seq_ops, 598 sizeof(struct ipmr_mfc_iter)); 599 } 600 601 static const struct file_operations ip6mr_mfc_fops = { 602 .owner = THIS_MODULE, 603 .open = ipmr_mfc_open, 604 .read = seq_read, 605 .llseek = seq_lseek, 606 .release = seq_release_net, 607 }; 608 #endif 609 610 #ifdef CONFIG_IPV6_PIMSM_V2 611 612 static int pim6_rcv(struct sk_buff *skb) 613 { 614 struct pimreghdr *pim; 615 struct ipv6hdr *encap; 616 struct net_device *reg_dev = NULL; 617 struct net *net = dev_net(skb->dev); 618 struct mr6_table *mrt; 619 struct flowi fl = { 620 .iif = skb->dev->ifindex, 621 .mark = skb->mark, 622 }; 623 int reg_vif_num; 624 625 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) 626 goto drop; 627 628 pim = (struct pimreghdr *)skb_transport_header(skb); 629 if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) || 630 (pim->flags & PIM_NULL_REGISTER) || 631 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 632 sizeof(*pim), IPPROTO_PIM, 633 csum_partial((void *)pim, sizeof(*pim), 0)) && 634 csum_fold(skb_checksum(skb, 0, skb->len, 0)))) 635 goto drop; 636 637 /* check if the inner packet is destined to mcast group */ 638 encap = (struct ipv6hdr *)(skb_transport_header(skb) + 639 sizeof(*pim)); 640 641 if (!ipv6_addr_is_multicast(&encap->daddr) || 642 encap->payload_len == 0 || 643 ntohs(encap->payload_len) + sizeof(*pim) > skb->len) 644 goto drop; 645 646 if (ip6mr_fib_lookup(net, &fl, &mrt) < 0) 647 goto drop; 648 reg_vif_num = mrt->mroute_reg_vif_num; 649 650 read_lock(&mrt_lock); 651 if (reg_vif_num >= 0) 652 reg_dev = mrt->vif6_table[reg_vif_num].dev; 653 if (reg_dev) 654 dev_hold(reg_dev); 655 read_unlock(&mrt_lock); 656 657 if (reg_dev == NULL) 658 goto drop; 659 660 skb->mac_header = skb->network_header; 661 skb_pull(skb, (u8 *)encap - skb->data); 662 skb_reset_network_header(skb); 663 skb->protocol = htons(ETH_P_IPV6); 664 skb->ip_summed = 0; 665 skb->pkt_type = PACKET_HOST; 666 667 skb_tunnel_rx(skb, reg_dev); 668 669 netif_rx(skb); 670 dev_put(reg_dev); 671 return 0; 672 drop: 673 kfree_skb(skb); 674 return 0; 675 } 676 677 static const struct inet6_protocol pim6_protocol = { 678 .handler = pim6_rcv, 679 }; 680 681 /* Service routines creating virtual interfaces: PIMREG */ 682 683 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, 684 struct net_device *dev) 685 { 686 struct net *net = dev_net(dev); 687 struct mr6_table *mrt; 688 struct flowi fl = { 689 .oif = dev->ifindex, 690 .iif = skb->skb_iif, 691 .mark = skb->mark, 692 }; 693 int err; 694 695 err = ip6mr_fib_lookup(net, &fl, &mrt); 696 if (err < 0) 697 return err; 698 699 read_lock(&mrt_lock); 700 dev->stats.tx_bytes += skb->len; 701 dev->stats.tx_packets++; 702 ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT); 703 read_unlock(&mrt_lock); 704 kfree_skb(skb); 705 return NETDEV_TX_OK; 706 } 707 708 static const struct net_device_ops reg_vif_netdev_ops = { 709 .ndo_start_xmit = reg_vif_xmit, 710 }; 711 712 static void reg_vif_setup(struct net_device *dev) 713 { 714 dev->type = ARPHRD_PIMREG; 715 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; 716 dev->flags = IFF_NOARP; 717 dev->netdev_ops = ®_vif_netdev_ops; 718 dev->destructor = free_netdev; 719 dev->features |= NETIF_F_NETNS_LOCAL; 720 } 721 722 static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt) 723 { 724 struct net_device *dev; 725 char name[IFNAMSIZ]; 726 727 if (mrt->id == RT6_TABLE_DFLT) 728 sprintf(name, "pim6reg"); 729 else 730 sprintf(name, "pim6reg%u", mrt->id); 731 732 dev = alloc_netdev(0, name, reg_vif_setup); 733 if (dev == NULL) 734 return NULL; 735 736 dev_net_set(dev, net); 737 738 if (register_netdevice(dev)) { 739 free_netdev(dev); 740 return NULL; 741 } 742 dev->iflink = 0; 743 744 if (dev_open(dev)) 745 goto failure; 746 747 dev_hold(dev); 748 return dev; 749 750 failure: 751 /* allow the register to be completed before unregistering. */ 752 rtnl_unlock(); 753 rtnl_lock(); 754 755 unregister_netdevice(dev); 756 return NULL; 757 } 758 #endif 759 760 /* 761 * Delete a VIF entry 762 */ 763 764 static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head) 765 { 766 struct mif_device *v; 767 struct net_device *dev; 768 struct inet6_dev *in6_dev; 769 770 if (vifi < 0 || vifi >= mrt->maxvif) 771 return -EADDRNOTAVAIL; 772 773 v = &mrt->vif6_table[vifi]; 774 775 write_lock_bh(&mrt_lock); 776 dev = v->dev; 777 v->dev = NULL; 778 779 if (!dev) { 780 write_unlock_bh(&mrt_lock); 781 return -EADDRNOTAVAIL; 782 } 783 784 #ifdef CONFIG_IPV6_PIMSM_V2 785 if (vifi == mrt->mroute_reg_vif_num) 786 mrt->mroute_reg_vif_num = -1; 787 #endif 788 789 if (vifi + 1 == mrt->maxvif) { 790 int tmp; 791 for (tmp = vifi - 1; tmp >= 0; tmp--) { 792 if (MIF_EXISTS(mrt, tmp)) 793 break; 794 } 795 mrt->maxvif = tmp + 1; 796 } 797 798 write_unlock_bh(&mrt_lock); 799 800 dev_set_allmulti(dev, -1); 801 802 in6_dev = __in6_dev_get(dev); 803 if (in6_dev) 804 in6_dev->cnf.mc_forwarding--; 805 806 if (v->flags & MIFF_REGISTER) 807 unregister_netdevice_queue(dev, head); 808 809 dev_put(dev); 810 return 0; 811 } 812 813 static inline void ip6mr_cache_free(struct mfc6_cache *c) 814 { 815 kmem_cache_free(mrt_cachep, c); 816 } 817 818 /* Destroy an unresolved cache entry, killing queued skbs 819 and reporting error to netlink readers. 820 */ 821 822 static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c) 823 { 824 struct net *net = read_pnet(&mrt->net); 825 struct sk_buff *skb; 826 827 atomic_dec(&mrt->cache_resolve_queue_len); 828 829 while((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) { 830 if (ipv6_hdr(skb)->version == 0) { 831 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); 832 nlh->nlmsg_type = NLMSG_ERROR; 833 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); 834 skb_trim(skb, nlh->nlmsg_len); 835 ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -ETIMEDOUT; 836 rtnl_unicast(skb, net, NETLINK_CB(skb).pid); 837 } else 838 kfree_skb(skb); 839 } 840 841 ip6mr_cache_free(c); 842 } 843 844 845 /* Timer process for all the unresolved queue. */ 846 847 static void ipmr_do_expire_process(struct mr6_table *mrt) 848 { 849 unsigned long now = jiffies; 850 unsigned long expires = 10 * HZ; 851 struct mfc6_cache *c, *next; 852 853 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) { 854 if (time_after(c->mfc_un.unres.expires, now)) { 855 /* not yet... */ 856 unsigned long interval = c->mfc_un.unres.expires - now; 857 if (interval < expires) 858 expires = interval; 859 continue; 860 } 861 862 list_del(&c->list); 863 ip6mr_destroy_unres(mrt, c); 864 } 865 866 if (!list_empty(&mrt->mfc6_unres_queue)) 867 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); 868 } 869 870 static void ipmr_expire_process(unsigned long arg) 871 { 872 struct mr6_table *mrt = (struct mr6_table *)arg; 873 874 if (!spin_trylock(&mfc_unres_lock)) { 875 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1); 876 return; 877 } 878 879 if (!list_empty(&mrt->mfc6_unres_queue)) 880 ipmr_do_expire_process(mrt); 881 882 spin_unlock(&mfc_unres_lock); 883 } 884 885 /* Fill oifs list. It is called under write locked mrt_lock. */ 886 887 static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache, 888 unsigned char *ttls) 889 { 890 int vifi; 891 892 cache->mfc_un.res.minvif = MAXMIFS; 893 cache->mfc_un.res.maxvif = 0; 894 memset(cache->mfc_un.res.ttls, 255, MAXMIFS); 895 896 for (vifi = 0; vifi < mrt->maxvif; vifi++) { 897 if (MIF_EXISTS(mrt, vifi) && 898 ttls[vifi] && ttls[vifi] < 255) { 899 cache->mfc_un.res.ttls[vifi] = ttls[vifi]; 900 if (cache->mfc_un.res.minvif > vifi) 901 cache->mfc_un.res.minvif = vifi; 902 if (cache->mfc_un.res.maxvif <= vifi) 903 cache->mfc_un.res.maxvif = vifi + 1; 904 } 905 } 906 } 907 908 static int mif6_add(struct net *net, struct mr6_table *mrt, 909 struct mif6ctl *vifc, int mrtsock) 910 { 911 int vifi = vifc->mif6c_mifi; 912 struct mif_device *v = &mrt->vif6_table[vifi]; 913 struct net_device *dev; 914 struct inet6_dev *in6_dev; 915 int err; 916 917 /* Is vif busy ? */ 918 if (MIF_EXISTS(mrt, vifi)) 919 return -EADDRINUSE; 920 921 switch (vifc->mif6c_flags) { 922 #ifdef CONFIG_IPV6_PIMSM_V2 923 case MIFF_REGISTER: 924 /* 925 * Special Purpose VIF in PIM 926 * All the packets will be sent to the daemon 927 */ 928 if (mrt->mroute_reg_vif_num >= 0) 929 return -EADDRINUSE; 930 dev = ip6mr_reg_vif(net, mrt); 931 if (!dev) 932 return -ENOBUFS; 933 err = dev_set_allmulti(dev, 1); 934 if (err) { 935 unregister_netdevice(dev); 936 dev_put(dev); 937 return err; 938 } 939 break; 940 #endif 941 case 0: 942 dev = dev_get_by_index(net, vifc->mif6c_pifi); 943 if (!dev) 944 return -EADDRNOTAVAIL; 945 err = dev_set_allmulti(dev, 1); 946 if (err) { 947 dev_put(dev); 948 return err; 949 } 950 break; 951 default: 952 return -EINVAL; 953 } 954 955 in6_dev = __in6_dev_get(dev); 956 if (in6_dev) 957 in6_dev->cnf.mc_forwarding++; 958 959 /* 960 * Fill in the VIF structures 961 */ 962 v->rate_limit = vifc->vifc_rate_limit; 963 v->flags = vifc->mif6c_flags; 964 if (!mrtsock) 965 v->flags |= VIFF_STATIC; 966 v->threshold = vifc->vifc_threshold; 967 v->bytes_in = 0; 968 v->bytes_out = 0; 969 v->pkt_in = 0; 970 v->pkt_out = 0; 971 v->link = dev->ifindex; 972 if (v->flags & MIFF_REGISTER) 973 v->link = dev->iflink; 974 975 /* And finish update writing critical data */ 976 write_lock_bh(&mrt_lock); 977 v->dev = dev; 978 #ifdef CONFIG_IPV6_PIMSM_V2 979 if (v->flags & MIFF_REGISTER) 980 mrt->mroute_reg_vif_num = vifi; 981 #endif 982 if (vifi + 1 > mrt->maxvif) 983 mrt->maxvif = vifi + 1; 984 write_unlock_bh(&mrt_lock); 985 return 0; 986 } 987 988 static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt, 989 struct in6_addr *origin, 990 struct in6_addr *mcastgrp) 991 { 992 int line = MFC6_HASH(mcastgrp, origin); 993 struct mfc6_cache *c; 994 995 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) { 996 if (ipv6_addr_equal(&c->mf6c_origin, origin) && 997 ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) 998 return c; 999 } 1000 return NULL; 1001 } 1002 1003 /* 1004 * Allocate a multicast cache entry 1005 */ 1006 static struct mfc6_cache *ip6mr_cache_alloc(void) 1007 { 1008 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); 1009 if (c == NULL) 1010 return NULL; 1011 c->mfc_un.res.minvif = MAXMIFS; 1012 return c; 1013 } 1014 1015 static struct mfc6_cache *ip6mr_cache_alloc_unres(void) 1016 { 1017 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); 1018 if (c == NULL) 1019 return NULL; 1020 skb_queue_head_init(&c->mfc_un.unres.unresolved); 1021 c->mfc_un.unres.expires = jiffies + 10 * HZ; 1022 return c; 1023 } 1024 1025 /* 1026 * A cache entry has gone into a resolved state from queued 1027 */ 1028 1029 static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt, 1030 struct mfc6_cache *uc, struct mfc6_cache *c) 1031 { 1032 struct sk_buff *skb; 1033 1034 /* 1035 * Play the pending entries through our router 1036 */ 1037 1038 while((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { 1039 if (ipv6_hdr(skb)->version == 0) { 1040 int err; 1041 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr)); 1042 1043 if (__ip6mr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) { 1044 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; 1045 } else { 1046 nlh->nlmsg_type = NLMSG_ERROR; 1047 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); 1048 skb_trim(skb, nlh->nlmsg_len); 1049 ((struct nlmsgerr *)NLMSG_DATA(nlh))->error = -EMSGSIZE; 1050 } 1051 err = rtnl_unicast(skb, net, NETLINK_CB(skb).pid); 1052 } else 1053 ip6_mr_forward(net, mrt, skb, c); 1054 } 1055 } 1056 1057 /* 1058 * Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd 1059 * expects the following bizarre scheme. 1060 * 1061 * Called under mrt_lock. 1062 */ 1063 1064 static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt, 1065 mifi_t mifi, int assert) 1066 { 1067 struct sk_buff *skb; 1068 struct mrt6msg *msg; 1069 int ret; 1070 1071 #ifdef CONFIG_IPV6_PIMSM_V2 1072 if (assert == MRT6MSG_WHOLEPKT) 1073 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) 1074 +sizeof(*msg)); 1075 else 1076 #endif 1077 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); 1078 1079 if (!skb) 1080 return -ENOBUFS; 1081 1082 /* I suppose that internal messages 1083 * do not require checksums */ 1084 1085 skb->ip_summed = CHECKSUM_UNNECESSARY; 1086 1087 #ifdef CONFIG_IPV6_PIMSM_V2 1088 if (assert == MRT6MSG_WHOLEPKT) { 1089 /* Ugly, but we have no choice with this interface. 1090 Duplicate old header, fix length etc. 1091 And all this only to mangle msg->im6_msgtype and 1092 to set msg->im6_mbz to "mbz" :-) 1093 */ 1094 skb_push(skb, -skb_network_offset(pkt)); 1095 1096 skb_push(skb, sizeof(*msg)); 1097 skb_reset_transport_header(skb); 1098 msg = (struct mrt6msg *)skb_transport_header(skb); 1099 msg->im6_mbz = 0; 1100 msg->im6_msgtype = MRT6MSG_WHOLEPKT; 1101 msg->im6_mif = mrt->mroute_reg_vif_num; 1102 msg->im6_pad = 0; 1103 ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); 1104 ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); 1105 1106 skb->ip_summed = CHECKSUM_UNNECESSARY; 1107 } else 1108 #endif 1109 { 1110 /* 1111 * Copy the IP header 1112 */ 1113 1114 skb_put(skb, sizeof(struct ipv6hdr)); 1115 skb_reset_network_header(skb); 1116 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); 1117 1118 /* 1119 * Add our header 1120 */ 1121 skb_put(skb, sizeof(*msg)); 1122 skb_reset_transport_header(skb); 1123 msg = (struct mrt6msg *)skb_transport_header(skb); 1124 1125 msg->im6_mbz = 0; 1126 msg->im6_msgtype = assert; 1127 msg->im6_mif = mifi; 1128 msg->im6_pad = 0; 1129 ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr); 1130 ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr); 1131 1132 skb_dst_set(skb, dst_clone(skb_dst(pkt))); 1133 skb->ip_summed = CHECKSUM_UNNECESSARY; 1134 } 1135 1136 if (mrt->mroute6_sk == NULL) { 1137 kfree_skb(skb); 1138 return -EINVAL; 1139 } 1140 1141 /* 1142 * Deliver to user space multicast routing algorithms 1143 */ 1144 ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb); 1145 if (ret < 0) { 1146 if (net_ratelimit()) 1147 printk(KERN_WARNING "mroute6: pending queue full, dropping entries.\n"); 1148 kfree_skb(skb); 1149 } 1150 1151 return ret; 1152 } 1153 1154 /* 1155 * Queue a packet for resolution. It gets locked cache entry! 1156 */ 1157 1158 static int 1159 ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb) 1160 { 1161 bool found = false; 1162 int err; 1163 struct mfc6_cache *c; 1164 1165 spin_lock_bh(&mfc_unres_lock); 1166 list_for_each_entry(c, &mrt->mfc6_unres_queue, list) { 1167 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && 1168 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) { 1169 found = true; 1170 break; 1171 } 1172 } 1173 1174 if (!found) { 1175 /* 1176 * Create a new entry if allowable 1177 */ 1178 1179 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || 1180 (c = ip6mr_cache_alloc_unres()) == NULL) { 1181 spin_unlock_bh(&mfc_unres_lock); 1182 1183 kfree_skb(skb); 1184 return -ENOBUFS; 1185 } 1186 1187 /* 1188 * Fill in the new cache entry 1189 */ 1190 c->mf6c_parent = -1; 1191 c->mf6c_origin = ipv6_hdr(skb)->saddr; 1192 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; 1193 1194 /* 1195 * Reflect first query at pim6sd 1196 */ 1197 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE); 1198 if (err < 0) { 1199 /* If the report failed throw the cache entry 1200 out - Brad Parker 1201 */ 1202 spin_unlock_bh(&mfc_unres_lock); 1203 1204 ip6mr_cache_free(c); 1205 kfree_skb(skb); 1206 return err; 1207 } 1208 1209 atomic_inc(&mrt->cache_resolve_queue_len); 1210 list_add(&c->list, &mrt->mfc6_unres_queue); 1211 1212 ipmr_do_expire_process(mrt); 1213 } 1214 1215 /* 1216 * See if we can append the packet 1217 */ 1218 if (c->mfc_un.unres.unresolved.qlen > 3) { 1219 kfree_skb(skb); 1220 err = -ENOBUFS; 1221 } else { 1222 skb_queue_tail(&c->mfc_un.unres.unresolved, skb); 1223 err = 0; 1224 } 1225 1226 spin_unlock_bh(&mfc_unres_lock); 1227 return err; 1228 } 1229 1230 /* 1231 * MFC6 cache manipulation by user space 1232 */ 1233 1234 static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc) 1235 { 1236 int line; 1237 struct mfc6_cache *c, *next; 1238 1239 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); 1240 1241 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) { 1242 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && 1243 ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { 1244 write_lock_bh(&mrt_lock); 1245 list_del(&c->list); 1246 write_unlock_bh(&mrt_lock); 1247 1248 ip6mr_cache_free(c); 1249 return 0; 1250 } 1251 } 1252 return -ENOENT; 1253 } 1254 1255 static int ip6mr_device_event(struct notifier_block *this, 1256 unsigned long event, void *ptr) 1257 { 1258 struct net_device *dev = ptr; 1259 struct net *net = dev_net(dev); 1260 struct mr6_table *mrt; 1261 struct mif_device *v; 1262 int ct; 1263 LIST_HEAD(list); 1264 1265 if (event != NETDEV_UNREGISTER) 1266 return NOTIFY_DONE; 1267 1268 ip6mr_for_each_table(mrt, net) { 1269 v = &mrt->vif6_table[0]; 1270 for (ct = 0; ct < mrt->maxvif; ct++, v++) { 1271 if (v->dev == dev) 1272 mif6_delete(mrt, ct, &list); 1273 } 1274 } 1275 unregister_netdevice_many(&list); 1276 1277 return NOTIFY_DONE; 1278 } 1279 1280 static struct notifier_block ip6_mr_notifier = { 1281 .notifier_call = ip6mr_device_event 1282 }; 1283 1284 /* 1285 * Setup for IP multicast routing 1286 */ 1287 1288 static int __net_init ip6mr_net_init(struct net *net) 1289 { 1290 int err; 1291 1292 err = ip6mr_rules_init(net); 1293 if (err < 0) 1294 goto fail; 1295 1296 #ifdef CONFIG_PROC_FS 1297 err = -ENOMEM; 1298 if (!proc_net_fops_create(net, "ip6_mr_vif", 0, &ip6mr_vif_fops)) 1299 goto proc_vif_fail; 1300 if (!proc_net_fops_create(net, "ip6_mr_cache", 0, &ip6mr_mfc_fops)) 1301 goto proc_cache_fail; 1302 #endif 1303 1304 return 0; 1305 1306 #ifdef CONFIG_PROC_FS 1307 proc_cache_fail: 1308 proc_net_remove(net, "ip6_mr_vif"); 1309 proc_vif_fail: 1310 ip6mr_rules_exit(net); 1311 #endif 1312 fail: 1313 return err; 1314 } 1315 1316 static void __net_exit ip6mr_net_exit(struct net *net) 1317 { 1318 #ifdef CONFIG_PROC_FS 1319 proc_net_remove(net, "ip6_mr_cache"); 1320 proc_net_remove(net, "ip6_mr_vif"); 1321 #endif 1322 ip6mr_rules_exit(net); 1323 } 1324 1325 static struct pernet_operations ip6mr_net_ops = { 1326 .init = ip6mr_net_init, 1327 .exit = ip6mr_net_exit, 1328 }; 1329 1330 int __init ip6_mr_init(void) 1331 { 1332 int err; 1333 1334 mrt_cachep = kmem_cache_create("ip6_mrt_cache", 1335 sizeof(struct mfc6_cache), 1336 0, SLAB_HWCACHE_ALIGN, 1337 NULL); 1338 if (!mrt_cachep) 1339 return -ENOMEM; 1340 1341 err = register_pernet_subsys(&ip6mr_net_ops); 1342 if (err) 1343 goto reg_pernet_fail; 1344 1345 err = register_netdevice_notifier(&ip6_mr_notifier); 1346 if (err) 1347 goto reg_notif_fail; 1348 #ifdef CONFIG_IPV6_PIMSM_V2 1349 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) { 1350 printk(KERN_ERR "ip6_mr_init: can't add PIM protocol\n"); 1351 err = -EAGAIN; 1352 goto add_proto_fail; 1353 } 1354 #endif 1355 rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL, ip6mr_rtm_dumproute); 1356 return 0; 1357 #ifdef CONFIG_IPV6_PIMSM_V2 1358 add_proto_fail: 1359 unregister_netdevice_notifier(&ip6_mr_notifier); 1360 #endif 1361 reg_notif_fail: 1362 unregister_pernet_subsys(&ip6mr_net_ops); 1363 reg_pernet_fail: 1364 kmem_cache_destroy(mrt_cachep); 1365 return err; 1366 } 1367 1368 void ip6_mr_cleanup(void) 1369 { 1370 unregister_netdevice_notifier(&ip6_mr_notifier); 1371 unregister_pernet_subsys(&ip6mr_net_ops); 1372 kmem_cache_destroy(mrt_cachep); 1373 } 1374 1375 static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt, 1376 struct mf6cctl *mfc, int mrtsock) 1377 { 1378 bool found = false; 1379 int line; 1380 struct mfc6_cache *uc, *c; 1381 unsigned char ttls[MAXMIFS]; 1382 int i; 1383 1384 if (mfc->mf6cc_parent >= MAXMIFS) 1385 return -ENFILE; 1386 1387 memset(ttls, 255, MAXMIFS); 1388 for (i = 0; i < MAXMIFS; i++) { 1389 if (IF_ISSET(i, &mfc->mf6cc_ifset)) 1390 ttls[i] = 1; 1391 1392 } 1393 1394 line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr); 1395 1396 list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) { 1397 if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) && 1398 ipv6_addr_equal(&c->mf6c_mcastgrp, &mfc->mf6cc_mcastgrp.sin6_addr)) { 1399 found = true; 1400 break; 1401 } 1402 } 1403 1404 if (found) { 1405 write_lock_bh(&mrt_lock); 1406 c->mf6c_parent = mfc->mf6cc_parent; 1407 ip6mr_update_thresholds(mrt, c, ttls); 1408 if (!mrtsock) 1409 c->mfc_flags |= MFC_STATIC; 1410 write_unlock_bh(&mrt_lock); 1411 return 0; 1412 } 1413 1414 if (!ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) 1415 return -EINVAL; 1416 1417 c = ip6mr_cache_alloc(); 1418 if (c == NULL) 1419 return -ENOMEM; 1420 1421 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; 1422 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; 1423 c->mf6c_parent = mfc->mf6cc_parent; 1424 ip6mr_update_thresholds(mrt, c, ttls); 1425 if (!mrtsock) 1426 c->mfc_flags |= MFC_STATIC; 1427 1428 write_lock_bh(&mrt_lock); 1429 list_add(&c->list, &mrt->mfc6_cache_array[line]); 1430 write_unlock_bh(&mrt_lock); 1431 1432 /* 1433 * Check to see if we resolved a queued list. If so we 1434 * need to send on the frames and tidy up. 1435 */ 1436 found = false; 1437 spin_lock_bh(&mfc_unres_lock); 1438 list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) { 1439 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && 1440 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { 1441 list_del(&uc->list); 1442 atomic_dec(&mrt->cache_resolve_queue_len); 1443 found = true; 1444 break; 1445 } 1446 } 1447 if (list_empty(&mrt->mfc6_unres_queue)) 1448 del_timer(&mrt->ipmr_expire_timer); 1449 spin_unlock_bh(&mfc_unres_lock); 1450 1451 if (found) { 1452 ip6mr_cache_resolve(net, mrt, uc, c); 1453 ip6mr_cache_free(uc); 1454 } 1455 return 0; 1456 } 1457 1458 /* 1459 * Close the multicast socket, and clear the vif tables etc 1460 */ 1461 1462 static void mroute_clean_tables(struct mr6_table *mrt) 1463 { 1464 int i; 1465 LIST_HEAD(list); 1466 struct mfc6_cache *c, *next; 1467 1468 /* 1469 * Shut down all active vif entries 1470 */ 1471 for (i = 0; i < mrt->maxvif; i++) { 1472 if (!(mrt->vif6_table[i].flags & VIFF_STATIC)) 1473 mif6_delete(mrt, i, &list); 1474 } 1475 unregister_netdevice_many(&list); 1476 1477 /* 1478 * Wipe the cache 1479 */ 1480 for (i = 0; i < MFC6_LINES; i++) { 1481 list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) { 1482 if (c->mfc_flags & MFC_STATIC) 1483 continue; 1484 write_lock_bh(&mrt_lock); 1485 list_del(&c->list); 1486 write_unlock_bh(&mrt_lock); 1487 1488 ip6mr_cache_free(c); 1489 } 1490 } 1491 1492 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { 1493 spin_lock_bh(&mfc_unres_lock); 1494 list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) { 1495 list_del(&c->list); 1496 ip6mr_destroy_unres(mrt, c); 1497 } 1498 spin_unlock_bh(&mfc_unres_lock); 1499 } 1500 } 1501 1502 static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk) 1503 { 1504 int err = 0; 1505 struct net *net = sock_net(sk); 1506 1507 rtnl_lock(); 1508 write_lock_bh(&mrt_lock); 1509 if (likely(mrt->mroute6_sk == NULL)) { 1510 mrt->mroute6_sk = sk; 1511 net->ipv6.devconf_all->mc_forwarding++; 1512 } 1513 else 1514 err = -EADDRINUSE; 1515 write_unlock_bh(&mrt_lock); 1516 1517 rtnl_unlock(); 1518 1519 return err; 1520 } 1521 1522 int ip6mr_sk_done(struct sock *sk) 1523 { 1524 int err = -EACCES; 1525 struct net *net = sock_net(sk); 1526 struct mr6_table *mrt; 1527 1528 rtnl_lock(); 1529 ip6mr_for_each_table(mrt, net) { 1530 if (sk == mrt->mroute6_sk) { 1531 write_lock_bh(&mrt_lock); 1532 mrt->mroute6_sk = NULL; 1533 net->ipv6.devconf_all->mc_forwarding--; 1534 write_unlock_bh(&mrt_lock); 1535 1536 mroute_clean_tables(mrt); 1537 err = 0; 1538 break; 1539 } 1540 } 1541 rtnl_unlock(); 1542 1543 return err; 1544 } 1545 1546 struct sock *mroute6_socket(struct net *net, struct sk_buff *skb) 1547 { 1548 struct mr6_table *mrt; 1549 struct flowi fl = { 1550 .iif = skb->skb_iif, 1551 .oif = skb->dev->ifindex, 1552 .mark = skb->mark, 1553 }; 1554 1555 if (ip6mr_fib_lookup(net, &fl, &mrt) < 0) 1556 return NULL; 1557 1558 return mrt->mroute6_sk; 1559 } 1560 1561 /* 1562 * Socket options and virtual interface manipulation. The whole 1563 * virtual interface system is a complete heap, but unfortunately 1564 * that's how BSD mrouted happens to think. Maybe one day with a proper 1565 * MOSPF/PIM router set up we can clean this up. 1566 */ 1567 1568 int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) 1569 { 1570 int ret; 1571 struct mif6ctl vif; 1572 struct mf6cctl mfc; 1573 mifi_t mifi; 1574 struct net *net = sock_net(sk); 1575 struct mr6_table *mrt; 1576 1577 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1578 if (mrt == NULL) 1579 return -ENOENT; 1580 1581 if (optname != MRT6_INIT) { 1582 if (sk != mrt->mroute6_sk && !capable(CAP_NET_ADMIN)) 1583 return -EACCES; 1584 } 1585 1586 switch (optname) { 1587 case MRT6_INIT: 1588 if (sk->sk_type != SOCK_RAW || 1589 inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1590 return -EOPNOTSUPP; 1591 if (optlen < sizeof(int)) 1592 return -EINVAL; 1593 1594 return ip6mr_sk_init(mrt, sk); 1595 1596 case MRT6_DONE: 1597 return ip6mr_sk_done(sk); 1598 1599 case MRT6_ADD_MIF: 1600 if (optlen < sizeof(vif)) 1601 return -EINVAL; 1602 if (copy_from_user(&vif, optval, sizeof(vif))) 1603 return -EFAULT; 1604 if (vif.mif6c_mifi >= MAXMIFS) 1605 return -ENFILE; 1606 rtnl_lock(); 1607 ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk); 1608 rtnl_unlock(); 1609 return ret; 1610 1611 case MRT6_DEL_MIF: 1612 if (optlen < sizeof(mifi_t)) 1613 return -EINVAL; 1614 if (copy_from_user(&mifi, optval, sizeof(mifi_t))) 1615 return -EFAULT; 1616 rtnl_lock(); 1617 ret = mif6_delete(mrt, mifi, NULL); 1618 rtnl_unlock(); 1619 return ret; 1620 1621 /* 1622 * Manipulate the forwarding caches. These live 1623 * in a sort of kernel/user symbiosis. 1624 */ 1625 case MRT6_ADD_MFC: 1626 case MRT6_DEL_MFC: 1627 if (optlen < sizeof(mfc)) 1628 return -EINVAL; 1629 if (copy_from_user(&mfc, optval, sizeof(mfc))) 1630 return -EFAULT; 1631 rtnl_lock(); 1632 if (optname == MRT6_DEL_MFC) 1633 ret = ip6mr_mfc_delete(mrt, &mfc); 1634 else 1635 ret = ip6mr_mfc_add(net, mrt, &mfc, sk == mrt->mroute6_sk); 1636 rtnl_unlock(); 1637 return ret; 1638 1639 /* 1640 * Control PIM assert (to activate pim will activate assert) 1641 */ 1642 case MRT6_ASSERT: 1643 { 1644 int v; 1645 if (get_user(v, (int __user *)optval)) 1646 return -EFAULT; 1647 mrt->mroute_do_assert = !!v; 1648 return 0; 1649 } 1650 1651 #ifdef CONFIG_IPV6_PIMSM_V2 1652 case MRT6_PIM: 1653 { 1654 int v; 1655 if (get_user(v, (int __user *)optval)) 1656 return -EFAULT; 1657 v = !!v; 1658 rtnl_lock(); 1659 ret = 0; 1660 if (v != mrt->mroute_do_pim) { 1661 mrt->mroute_do_pim = v; 1662 mrt->mroute_do_assert = v; 1663 } 1664 rtnl_unlock(); 1665 return ret; 1666 } 1667 1668 #endif 1669 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES 1670 case MRT6_TABLE: 1671 { 1672 u32 v; 1673 1674 if (optlen != sizeof(u32)) 1675 return -EINVAL; 1676 if (get_user(v, (u32 __user *)optval)) 1677 return -EFAULT; 1678 if (sk == mrt->mroute6_sk) 1679 return -EBUSY; 1680 1681 rtnl_lock(); 1682 ret = 0; 1683 if (!ip6mr_new_table(net, v)) 1684 ret = -ENOMEM; 1685 raw6_sk(sk)->ip6mr_table = v; 1686 rtnl_unlock(); 1687 return ret; 1688 } 1689 #endif 1690 /* 1691 * Spurious command, or MRT6_VERSION which you cannot 1692 * set. 1693 */ 1694 default: 1695 return -ENOPROTOOPT; 1696 } 1697 } 1698 1699 /* 1700 * Getsock opt support for the multicast routing system. 1701 */ 1702 1703 int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, 1704 int __user *optlen) 1705 { 1706 int olr; 1707 int val; 1708 struct net *net = sock_net(sk); 1709 struct mr6_table *mrt; 1710 1711 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1712 if (mrt == NULL) 1713 return -ENOENT; 1714 1715 switch (optname) { 1716 case MRT6_VERSION: 1717 val = 0x0305; 1718 break; 1719 #ifdef CONFIG_IPV6_PIMSM_V2 1720 case MRT6_PIM: 1721 val = mrt->mroute_do_pim; 1722 break; 1723 #endif 1724 case MRT6_ASSERT: 1725 val = mrt->mroute_do_assert; 1726 break; 1727 default: 1728 return -ENOPROTOOPT; 1729 } 1730 1731 if (get_user(olr, optlen)) 1732 return -EFAULT; 1733 1734 olr = min_t(int, olr, sizeof(int)); 1735 if (olr < 0) 1736 return -EINVAL; 1737 1738 if (put_user(olr, optlen)) 1739 return -EFAULT; 1740 if (copy_to_user(optval, &val, olr)) 1741 return -EFAULT; 1742 return 0; 1743 } 1744 1745 /* 1746 * The IP multicast ioctl support routines. 1747 */ 1748 1749 int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) 1750 { 1751 struct sioc_sg_req6 sr; 1752 struct sioc_mif_req6 vr; 1753 struct mif_device *vif; 1754 struct mfc6_cache *c; 1755 struct net *net = sock_net(sk); 1756 struct mr6_table *mrt; 1757 1758 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1759 if (mrt == NULL) 1760 return -ENOENT; 1761 1762 switch (cmd) { 1763 case SIOCGETMIFCNT_IN6: 1764 if (copy_from_user(&vr, arg, sizeof(vr))) 1765 return -EFAULT; 1766 if (vr.mifi >= mrt->maxvif) 1767 return -EINVAL; 1768 read_lock(&mrt_lock); 1769 vif = &mrt->vif6_table[vr.mifi]; 1770 if (MIF_EXISTS(mrt, vr.mifi)) { 1771 vr.icount = vif->pkt_in; 1772 vr.ocount = vif->pkt_out; 1773 vr.ibytes = vif->bytes_in; 1774 vr.obytes = vif->bytes_out; 1775 read_unlock(&mrt_lock); 1776 1777 if (copy_to_user(arg, &vr, sizeof(vr))) 1778 return -EFAULT; 1779 return 0; 1780 } 1781 read_unlock(&mrt_lock); 1782 return -EADDRNOTAVAIL; 1783 case SIOCGETSGCNT_IN6: 1784 if (copy_from_user(&sr, arg, sizeof(sr))) 1785 return -EFAULT; 1786 1787 read_lock(&mrt_lock); 1788 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); 1789 if (c) { 1790 sr.pktcnt = c->mfc_un.res.pkt; 1791 sr.bytecnt = c->mfc_un.res.bytes; 1792 sr.wrong_if = c->mfc_un.res.wrong_if; 1793 read_unlock(&mrt_lock); 1794 1795 if (copy_to_user(arg, &sr, sizeof(sr))) 1796 return -EFAULT; 1797 return 0; 1798 } 1799 read_unlock(&mrt_lock); 1800 return -EADDRNOTAVAIL; 1801 default: 1802 return -ENOIOCTLCMD; 1803 } 1804 } 1805 1806 1807 static inline int ip6mr_forward2_finish(struct sk_buff *skb) 1808 { 1809 IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)), 1810 IPSTATS_MIB_OUTFORWDATAGRAMS); 1811 return dst_output(skb); 1812 } 1813 1814 /* 1815 * Processing handlers for ip6mr_forward 1816 */ 1817 1818 static int ip6mr_forward2(struct net *net, struct mr6_table *mrt, 1819 struct sk_buff *skb, struct mfc6_cache *c, int vifi) 1820 { 1821 struct ipv6hdr *ipv6h; 1822 struct mif_device *vif = &mrt->vif6_table[vifi]; 1823 struct net_device *dev; 1824 struct dst_entry *dst; 1825 struct flowi fl; 1826 1827 if (vif->dev == NULL) 1828 goto out_free; 1829 1830 #ifdef CONFIG_IPV6_PIMSM_V2 1831 if (vif->flags & MIFF_REGISTER) { 1832 vif->pkt_out++; 1833 vif->bytes_out += skb->len; 1834 vif->dev->stats.tx_bytes += skb->len; 1835 vif->dev->stats.tx_packets++; 1836 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT); 1837 goto out_free; 1838 } 1839 #endif 1840 1841 ipv6h = ipv6_hdr(skb); 1842 1843 fl = (struct flowi) { 1844 .oif = vif->link, 1845 .nl_u = { .ip6_u = 1846 { .daddr = ipv6h->daddr, } 1847 } 1848 }; 1849 1850 dst = ip6_route_output(net, NULL, &fl); 1851 if (!dst) 1852 goto out_free; 1853 1854 skb_dst_drop(skb); 1855 skb_dst_set(skb, dst); 1856 1857 /* 1858 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally 1859 * not only before forwarding, but after forwarding on all output 1860 * interfaces. It is clear, if mrouter runs a multicasting 1861 * program, it should receive packets not depending to what interface 1862 * program is joined. 1863 * If we will not make it, the program will have to join on all 1864 * interfaces. On the other hand, multihoming host (or router, but 1865 * not mrouter) cannot join to more than one interface - it will 1866 * result in receiving multiple packets. 1867 */ 1868 dev = vif->dev; 1869 skb->dev = dev; 1870 vif->pkt_out++; 1871 vif->bytes_out += skb->len; 1872 1873 /* We are about to write */ 1874 /* XXX: extension headers? */ 1875 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev))) 1876 goto out_free; 1877 1878 ipv6h = ipv6_hdr(skb); 1879 ipv6h->hop_limit--; 1880 1881 IP6CB(skb)->flags |= IP6SKB_FORWARDED; 1882 1883 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dev, 1884 ip6mr_forward2_finish); 1885 1886 out_free: 1887 kfree_skb(skb); 1888 return 0; 1889 } 1890 1891 static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev) 1892 { 1893 int ct; 1894 1895 for (ct = mrt->maxvif - 1; ct >= 0; ct--) { 1896 if (mrt->vif6_table[ct].dev == dev) 1897 break; 1898 } 1899 return ct; 1900 } 1901 1902 static int ip6_mr_forward(struct net *net, struct mr6_table *mrt, 1903 struct sk_buff *skb, struct mfc6_cache *cache) 1904 { 1905 int psend = -1; 1906 int vif, ct; 1907 1908 vif = cache->mf6c_parent; 1909 cache->mfc_un.res.pkt++; 1910 cache->mfc_un.res.bytes += skb->len; 1911 1912 /* 1913 * Wrong interface: drop packet and (maybe) send PIM assert. 1914 */ 1915 if (mrt->vif6_table[vif].dev != skb->dev) { 1916 int true_vifi; 1917 1918 cache->mfc_un.res.wrong_if++; 1919 true_vifi = ip6mr_find_vif(mrt, skb->dev); 1920 1921 if (true_vifi >= 0 && mrt->mroute_do_assert && 1922 /* pimsm uses asserts, when switching from RPT to SPT, 1923 so that we cannot check that packet arrived on an oif. 1924 It is bad, but otherwise we would need to move pretty 1925 large chunk of pimd to kernel. Ough... --ANK 1926 */ 1927 (mrt->mroute_do_pim || 1928 cache->mfc_un.res.ttls[true_vifi] < 255) && 1929 time_after(jiffies, 1930 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { 1931 cache->mfc_un.res.last_assert = jiffies; 1932 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF); 1933 } 1934 goto dont_forward; 1935 } 1936 1937 mrt->vif6_table[vif].pkt_in++; 1938 mrt->vif6_table[vif].bytes_in += skb->len; 1939 1940 /* 1941 * Forward the frame 1942 */ 1943 for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) { 1944 if (ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) { 1945 if (psend != -1) { 1946 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 1947 if (skb2) 1948 ip6mr_forward2(net, mrt, skb2, cache, psend); 1949 } 1950 psend = ct; 1951 } 1952 } 1953 if (psend != -1) { 1954 ip6mr_forward2(net, mrt, skb, cache, psend); 1955 return 0; 1956 } 1957 1958 dont_forward: 1959 kfree_skb(skb); 1960 return 0; 1961 } 1962 1963 1964 /* 1965 * Multicast packets for forwarding arrive here 1966 */ 1967 1968 int ip6_mr_input(struct sk_buff *skb) 1969 { 1970 struct mfc6_cache *cache; 1971 struct net *net = dev_net(skb->dev); 1972 struct mr6_table *mrt; 1973 struct flowi fl = { 1974 .iif = skb->dev->ifindex, 1975 .mark = skb->mark, 1976 }; 1977 int err; 1978 1979 err = ip6mr_fib_lookup(net, &fl, &mrt); 1980 if (err < 0) 1981 return err; 1982 1983 read_lock(&mrt_lock); 1984 cache = ip6mr_cache_find(mrt, 1985 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); 1986 1987 /* 1988 * No usable cache entry 1989 */ 1990 if (cache == NULL) { 1991 int vif; 1992 1993 vif = ip6mr_find_vif(mrt, skb->dev); 1994 if (vif >= 0) { 1995 int err = ip6mr_cache_unresolved(mrt, vif, skb); 1996 read_unlock(&mrt_lock); 1997 1998 return err; 1999 } 2000 read_unlock(&mrt_lock); 2001 kfree_skb(skb); 2002 return -ENODEV; 2003 } 2004 2005 ip6_mr_forward(net, mrt, skb, cache); 2006 2007 read_unlock(&mrt_lock); 2008 2009 return 0; 2010 } 2011 2012 2013 static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, 2014 struct mfc6_cache *c, struct rtmsg *rtm) 2015 { 2016 int ct; 2017 struct rtnexthop *nhp; 2018 u8 *b = skb_tail_pointer(skb); 2019 struct rtattr *mp_head; 2020 2021 /* If cache is unresolved, don't try to parse IIF and OIF */ 2022 if (c->mf6c_parent >= MAXMIFS) 2023 return -ENOENT; 2024 2025 if (MIF_EXISTS(mrt, c->mf6c_parent)) 2026 RTA_PUT(skb, RTA_IIF, 4, &mrt->vif6_table[c->mf6c_parent].dev->ifindex); 2027 2028 mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); 2029 2030 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { 2031 if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { 2032 if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) 2033 goto rtattr_failure; 2034 nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); 2035 nhp->rtnh_flags = 0; 2036 nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; 2037 nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex; 2038 nhp->rtnh_len = sizeof(*nhp); 2039 } 2040 } 2041 mp_head->rta_type = RTA_MULTIPATH; 2042 mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; 2043 rtm->rtm_type = RTN_MULTICAST; 2044 return 1; 2045 2046 rtattr_failure: 2047 nlmsg_trim(skb, b); 2048 return -EMSGSIZE; 2049 } 2050 2051 int ip6mr_get_route(struct net *net, 2052 struct sk_buff *skb, struct rtmsg *rtm, int nowait) 2053 { 2054 int err; 2055 struct mr6_table *mrt; 2056 struct mfc6_cache *cache; 2057 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); 2058 2059 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); 2060 if (mrt == NULL) 2061 return -ENOENT; 2062 2063 read_lock(&mrt_lock); 2064 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); 2065 2066 if (!cache) { 2067 struct sk_buff *skb2; 2068 struct ipv6hdr *iph; 2069 struct net_device *dev; 2070 int vif; 2071 2072 if (nowait) { 2073 read_unlock(&mrt_lock); 2074 return -EAGAIN; 2075 } 2076 2077 dev = skb->dev; 2078 if (dev == NULL || (vif = ip6mr_find_vif(mrt, dev)) < 0) { 2079 read_unlock(&mrt_lock); 2080 return -ENODEV; 2081 } 2082 2083 /* really correct? */ 2084 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 2085 if (!skb2) { 2086 read_unlock(&mrt_lock); 2087 return -ENOMEM; 2088 } 2089 2090 skb_reset_transport_header(skb2); 2091 2092 skb_put(skb2, sizeof(struct ipv6hdr)); 2093 skb_reset_network_header(skb2); 2094 2095 iph = ipv6_hdr(skb2); 2096 iph->version = 0; 2097 iph->priority = 0; 2098 iph->flow_lbl[0] = 0; 2099 iph->flow_lbl[1] = 0; 2100 iph->flow_lbl[2] = 0; 2101 iph->payload_len = 0; 2102 iph->nexthdr = IPPROTO_NONE; 2103 iph->hop_limit = 0; 2104 ipv6_addr_copy(&iph->saddr, &rt->rt6i_src.addr); 2105 ipv6_addr_copy(&iph->daddr, &rt->rt6i_dst.addr); 2106 2107 err = ip6mr_cache_unresolved(mrt, vif, skb2); 2108 read_unlock(&mrt_lock); 2109 2110 return err; 2111 } 2112 2113 if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY)) 2114 cache->mfc_flags |= MFC_NOTIFY; 2115 2116 err = __ip6mr_fill_mroute(mrt, skb, cache, rtm); 2117 read_unlock(&mrt_lock); 2118 return err; 2119 } 2120 2121 static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb, 2122 u32 pid, u32 seq, struct mfc6_cache *c) 2123 { 2124 struct nlmsghdr *nlh; 2125 struct rtmsg *rtm; 2126 2127 nlh = nlmsg_put(skb, pid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI); 2128 if (nlh == NULL) 2129 return -EMSGSIZE; 2130 2131 rtm = nlmsg_data(nlh); 2132 rtm->rtm_family = RTNL_FAMILY_IPMR; 2133 rtm->rtm_dst_len = 128; 2134 rtm->rtm_src_len = 128; 2135 rtm->rtm_tos = 0; 2136 rtm->rtm_table = mrt->id; 2137 NLA_PUT_U32(skb, RTA_TABLE, mrt->id); 2138 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2139 rtm->rtm_protocol = RTPROT_UNSPEC; 2140 rtm->rtm_flags = 0; 2141 2142 NLA_PUT(skb, RTA_SRC, 16, &c->mf6c_origin); 2143 NLA_PUT(skb, RTA_DST, 16, &c->mf6c_mcastgrp); 2144 2145 if (__ip6mr_fill_mroute(mrt, skb, c, rtm) < 0) 2146 goto nla_put_failure; 2147 2148 return nlmsg_end(skb, nlh); 2149 2150 nla_put_failure: 2151 nlmsg_cancel(skb, nlh); 2152 return -EMSGSIZE; 2153 } 2154 2155 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) 2156 { 2157 struct net *net = sock_net(skb->sk); 2158 struct mr6_table *mrt; 2159 struct mfc6_cache *mfc; 2160 unsigned int t = 0, s_t; 2161 unsigned int h = 0, s_h; 2162 unsigned int e = 0, s_e; 2163 2164 s_t = cb->args[0]; 2165 s_h = cb->args[1]; 2166 s_e = cb->args[2]; 2167 2168 read_lock(&mrt_lock); 2169 ip6mr_for_each_table(mrt, net) { 2170 if (t < s_t) 2171 goto next_table; 2172 if (t > s_t) 2173 s_h = 0; 2174 for (h = s_h; h < MFC6_LINES; h++) { 2175 list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) { 2176 if (e < s_e) 2177 goto next_entry; 2178 if (ip6mr_fill_mroute(mrt, skb, 2179 NETLINK_CB(cb->skb).pid, 2180 cb->nlh->nlmsg_seq, 2181 mfc) < 0) 2182 goto done; 2183 next_entry: 2184 e++; 2185 } 2186 e = s_e = 0; 2187 } 2188 s_h = 0; 2189 next_table: 2190 t++; 2191 } 2192 done: 2193 read_unlock(&mrt_lock); 2194 2195 cb->args[2] = e; 2196 cb->args[1] = h; 2197 cb->args[0] = t; 2198 2199 return skb->len; 2200 } 2201