1 /* 2 * IP multicast routing support for mrouted 3.6/3.8 3 * 4 * (c) 1995 Alan Cox, <alan@lxorguk.ukuu.org.uk> 5 * Linux Consultancy and Custom Driver Development 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 * 12 * Fixes: 13 * Michael Chastain : Incorrect size of copying. 14 * Alan Cox : Added the cache manager code 15 * Alan Cox : Fixed the clone/copy bug and device race. 16 * Mike McLagan : Routing by source 17 * Malcolm Beattie : Buffer handling fixes. 18 * Alexey Kuznetsov : Double buffer free and other fixes. 19 * SVR Anand : Fixed several multicast bugs and problems. 20 * Alexey Kuznetsov : Status, optimisations and more. 21 * Brad Parker : Better behaviour on mrouted upcall 22 * overflow. 23 * Carlos Picoto : PIMv1 Support 24 * Pavlin Ivanov Radoslavov: PIMv2 Registers must checksum only PIM header 25 * Relax this requirement to work with older peers. 26 * 27 */ 28 29 #include <asm/system.h> 30 #include <asm/uaccess.h> 31 #include <linux/types.h> 32 #include <linux/capability.h> 33 #include <linux/errno.h> 34 #include <linux/timer.h> 35 #include <linux/mm.h> 36 #include <linux/kernel.h> 37 #include <linux/fcntl.h> 38 #include <linux/stat.h> 39 #include <linux/socket.h> 40 #include <linux/in.h> 41 #include <linux/inet.h> 42 #include <linux/netdevice.h> 43 #include <linux/inetdevice.h> 44 #include <linux/igmp.h> 45 #include <linux/proc_fs.h> 46 #include <linux/seq_file.h> 47 #include <linux/mroute.h> 48 #include <linux/init.h> 49 #include <linux/if_ether.h> 50 #include <linux/slab.h> 51 #include <net/net_namespace.h> 52 #include <net/ip.h> 53 #include <net/protocol.h> 54 #include <linux/skbuff.h> 55 #include <net/route.h> 56 #include <net/sock.h> 57 #include <net/icmp.h> 58 #include <net/udp.h> 59 #include <net/raw.h> 60 #include <linux/notifier.h> 61 #include <linux/if_arp.h> 62 #include <linux/netfilter_ipv4.h> 63 #include <linux/compat.h> 64 #include <net/ipip.h> 65 #include <net/checksum.h> 66 #include <net/netlink.h> 67 #include <net/fib_rules.h> 68 69 #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) 70 #define CONFIG_IP_PIMSM 1 71 #endif 72 73 struct mr_table { 74 struct list_head list; 75 #ifdef CONFIG_NET_NS 76 struct net *net; 77 #endif 78 u32 id; 79 struct sock __rcu *mroute_sk; 80 struct timer_list ipmr_expire_timer; 81 struct list_head mfc_unres_queue; 82 struct list_head mfc_cache_array[MFC_LINES]; 83 struct vif_device vif_table[MAXVIFS]; 84 int maxvif; 85 atomic_t cache_resolve_queue_len; 86 int mroute_do_assert; 87 int mroute_do_pim; 88 #if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2) 89 int mroute_reg_vif_num; 90 #endif 91 }; 92 93 struct ipmr_rule { 94 struct fib_rule common; 95 }; 96 97 struct ipmr_result { 98 struct mr_table *mrt; 99 }; 100 101 /* Big lock, protecting vif table, mrt cache and mroute socket state. 102 * Note that the changes are semaphored via rtnl_lock. 103 */ 104 105 static DEFINE_RWLOCK(mrt_lock); 106 107 /* 108 * Multicast router control variables 109 */ 110 111 #define VIF_EXISTS(_mrt, _idx) ((_mrt)->vif_table[_idx].dev != NULL) 112 113 /* Special spinlock for queue of unresolved entries */ 114 static DEFINE_SPINLOCK(mfc_unres_lock); 115 116 /* We return to original Alan's scheme. Hash table of resolved 117 * entries is changed only in process context and protected 118 * with weak lock mrt_lock. Queue of unresolved entries is protected 119 * with strong spinlock mfc_unres_lock. 120 * 121 * In this case data path is free of exclusive locks at all. 122 */ 123 124 static struct kmem_cache *mrt_cachep __read_mostly; 125 126 static struct mr_table *ipmr_new_table(struct net *net, u32 id); 127 static int ip_mr_forward(struct net *net, struct mr_table *mrt, 128 struct sk_buff *skb, struct mfc_cache *cache, 129 int local); 130 static int ipmr_cache_report(struct mr_table *mrt, 131 struct sk_buff *pkt, vifi_t vifi, int assert); 132 static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, 133 struct mfc_cache *c, struct rtmsg *rtm); 134 static void ipmr_expire_process(unsigned long arg); 135 136 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES 137 #define ipmr_for_each_table(mrt, net) \ 138 list_for_each_entry_rcu(mrt, &net->ipv4.mr_tables, list) 139 140 static struct mr_table *ipmr_get_table(struct net *net, u32 id) 141 { 142 struct mr_table *mrt; 143 144 ipmr_for_each_table(mrt, net) { 145 if (mrt->id == id) 146 return mrt; 147 } 148 return NULL; 149 } 150 151 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, 152 struct mr_table **mrt) 153 { 154 struct ipmr_result res; 155 struct fib_lookup_arg arg = { .result = &res, }; 156 int err; 157 158 err = fib_rules_lookup(net->ipv4.mr_rules_ops, 159 flowi4_to_flowi(flp4), 0, &arg); 160 if (err < 0) 161 return err; 162 *mrt = res.mrt; 163 return 0; 164 } 165 166 static int ipmr_rule_action(struct fib_rule *rule, struct flowi *flp, 167 int flags, struct fib_lookup_arg *arg) 168 { 169 struct ipmr_result *res = arg->result; 170 struct mr_table *mrt; 171 172 switch (rule->action) { 173 case FR_ACT_TO_TBL: 174 break; 175 case FR_ACT_UNREACHABLE: 176 return -ENETUNREACH; 177 case FR_ACT_PROHIBIT: 178 return -EACCES; 179 case FR_ACT_BLACKHOLE: 180 default: 181 return -EINVAL; 182 } 183 184 mrt = ipmr_get_table(rule->fr_net, rule->table); 185 if (mrt == NULL) 186 return -EAGAIN; 187 res->mrt = mrt; 188 return 0; 189 } 190 191 static int ipmr_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) 192 { 193 return 1; 194 } 195 196 static const struct nla_policy ipmr_rule_policy[FRA_MAX + 1] = { 197 FRA_GENERIC_POLICY, 198 }; 199 200 static int ipmr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, 201 struct fib_rule_hdr *frh, struct nlattr **tb) 202 { 203 return 0; 204 } 205 206 static int ipmr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, 207 struct nlattr **tb) 208 { 209 return 1; 210 } 211 212 static int ipmr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, 213 struct fib_rule_hdr *frh) 214 { 215 frh->dst_len = 0; 216 frh->src_len = 0; 217 frh->tos = 0; 218 return 0; 219 } 220 221 static const struct fib_rules_ops __net_initdata ipmr_rules_ops_template = { 222 .family = RTNL_FAMILY_IPMR, 223 .rule_size = sizeof(struct ipmr_rule), 224 .addr_size = sizeof(u32), 225 .action = ipmr_rule_action, 226 .match = ipmr_rule_match, 227 .configure = ipmr_rule_configure, 228 .compare = ipmr_rule_compare, 229 .default_pref = fib_default_rule_pref, 230 .fill = ipmr_rule_fill, 231 .nlgroup = RTNLGRP_IPV4_RULE, 232 .policy = ipmr_rule_policy, 233 .owner = THIS_MODULE, 234 }; 235 236 static int __net_init ipmr_rules_init(struct net *net) 237 { 238 struct fib_rules_ops *ops; 239 struct mr_table *mrt; 240 int err; 241 242 ops = fib_rules_register(&ipmr_rules_ops_template, net); 243 if (IS_ERR(ops)) 244 return PTR_ERR(ops); 245 246 INIT_LIST_HEAD(&net->ipv4.mr_tables); 247 248 mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); 249 if (mrt == NULL) { 250 err = -ENOMEM; 251 goto err1; 252 } 253 254 err = fib_default_rule_add(ops, 0x7fff, RT_TABLE_DEFAULT, 0); 255 if (err < 0) 256 goto err2; 257 258 net->ipv4.mr_rules_ops = ops; 259 return 0; 260 261 err2: 262 kfree(mrt); 263 err1: 264 fib_rules_unregister(ops); 265 return err; 266 } 267 268 static void __net_exit ipmr_rules_exit(struct net *net) 269 { 270 struct mr_table *mrt, *next; 271 272 list_for_each_entry_safe(mrt, next, &net->ipv4.mr_tables, list) { 273 list_del(&mrt->list); 274 kfree(mrt); 275 } 276 fib_rules_unregister(net->ipv4.mr_rules_ops); 277 } 278 #else 279 #define ipmr_for_each_table(mrt, net) \ 280 for (mrt = net->ipv4.mrt; mrt; mrt = NULL) 281 282 static struct mr_table *ipmr_get_table(struct net *net, u32 id) 283 { 284 return net->ipv4.mrt; 285 } 286 287 static int ipmr_fib_lookup(struct net *net, struct flowi4 *flp4, 288 struct mr_table **mrt) 289 { 290 *mrt = net->ipv4.mrt; 291 return 0; 292 } 293 294 static int __net_init ipmr_rules_init(struct net *net) 295 { 296 net->ipv4.mrt = ipmr_new_table(net, RT_TABLE_DEFAULT); 297 return net->ipv4.mrt ? 0 : -ENOMEM; 298 } 299 300 static void __net_exit ipmr_rules_exit(struct net *net) 301 { 302 kfree(net->ipv4.mrt); 303 } 304 #endif 305 306 static struct mr_table *ipmr_new_table(struct net *net, u32 id) 307 { 308 struct mr_table *mrt; 309 unsigned int i; 310 311 mrt = ipmr_get_table(net, id); 312 if (mrt != NULL) 313 return mrt; 314 315 mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); 316 if (mrt == NULL) 317 return NULL; 318 write_pnet(&mrt->net, net); 319 mrt->id = id; 320 321 /* Forwarding cache */ 322 for (i = 0; i < MFC_LINES; i++) 323 INIT_LIST_HEAD(&mrt->mfc_cache_array[i]); 324 325 INIT_LIST_HEAD(&mrt->mfc_unres_queue); 326 327 setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process, 328 (unsigned long)mrt); 329 330 #ifdef CONFIG_IP_PIMSM 331 mrt->mroute_reg_vif_num = -1; 332 #endif 333 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES 334 list_add_tail_rcu(&mrt->list, &net->ipv4.mr_tables); 335 #endif 336 return mrt; 337 } 338 339 /* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */ 340 341 static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v) 342 { 343 struct net *net = dev_net(dev); 344 345 dev_close(dev); 346 347 dev = __dev_get_by_name(net, "tunl0"); 348 if (dev) { 349 const struct net_device_ops *ops = dev->netdev_ops; 350 struct ifreq ifr; 351 struct ip_tunnel_parm p; 352 353 memset(&p, 0, sizeof(p)); 354 p.iph.daddr = v->vifc_rmt_addr.s_addr; 355 p.iph.saddr = v->vifc_lcl_addr.s_addr; 356 p.iph.version = 4; 357 p.iph.ihl = 5; 358 p.iph.protocol = IPPROTO_IPIP; 359 sprintf(p.name, "dvmrp%d", v->vifc_vifi); 360 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 361 362 if (ops->ndo_do_ioctl) { 363 mm_segment_t oldfs = get_fs(); 364 365 set_fs(KERNEL_DS); 366 ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL); 367 set_fs(oldfs); 368 } 369 } 370 } 371 372 static 373 struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v) 374 { 375 struct net_device *dev; 376 377 dev = __dev_get_by_name(net, "tunl0"); 378 379 if (dev) { 380 const struct net_device_ops *ops = dev->netdev_ops; 381 int err; 382 struct ifreq ifr; 383 struct ip_tunnel_parm p; 384 struct in_device *in_dev; 385 386 memset(&p, 0, sizeof(p)); 387 p.iph.daddr = v->vifc_rmt_addr.s_addr; 388 p.iph.saddr = v->vifc_lcl_addr.s_addr; 389 p.iph.version = 4; 390 p.iph.ihl = 5; 391 p.iph.protocol = IPPROTO_IPIP; 392 sprintf(p.name, "dvmrp%d", v->vifc_vifi); 393 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 394 395 if (ops->ndo_do_ioctl) { 396 mm_segment_t oldfs = get_fs(); 397 398 set_fs(KERNEL_DS); 399 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 400 set_fs(oldfs); 401 } else { 402 err = -EOPNOTSUPP; 403 } 404 dev = NULL; 405 406 if (err == 0 && 407 (dev = __dev_get_by_name(net, p.name)) != NULL) { 408 dev->flags |= IFF_MULTICAST; 409 410 in_dev = __in_dev_get_rtnl(dev); 411 if (in_dev == NULL) 412 goto failure; 413 414 ipv4_devconf_setall(in_dev); 415 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; 416 417 if (dev_open(dev)) 418 goto failure; 419 dev_hold(dev); 420 } 421 } 422 return dev; 423 424 failure: 425 /* allow the register to be completed before unregistering. */ 426 rtnl_unlock(); 427 rtnl_lock(); 428 429 unregister_netdevice(dev); 430 return NULL; 431 } 432 433 #ifdef CONFIG_IP_PIMSM 434 435 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, struct net_device *dev) 436 { 437 struct net *net = dev_net(dev); 438 struct mr_table *mrt; 439 struct flowi4 fl4 = { 440 .flowi4_oif = dev->ifindex, 441 .flowi4_iif = skb->skb_iif, 442 .flowi4_mark = skb->mark, 443 }; 444 int err; 445 446 err = ipmr_fib_lookup(net, &fl4, &mrt); 447 if (err < 0) { 448 kfree_skb(skb); 449 return err; 450 } 451 452 read_lock(&mrt_lock); 453 dev->stats.tx_bytes += skb->len; 454 dev->stats.tx_packets++; 455 ipmr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, IGMPMSG_WHOLEPKT); 456 read_unlock(&mrt_lock); 457 kfree_skb(skb); 458 return NETDEV_TX_OK; 459 } 460 461 static const struct net_device_ops reg_vif_netdev_ops = { 462 .ndo_start_xmit = reg_vif_xmit, 463 }; 464 465 static void reg_vif_setup(struct net_device *dev) 466 { 467 dev->type = ARPHRD_PIMREG; 468 dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 8; 469 dev->flags = IFF_NOARP; 470 dev->netdev_ops = ®_vif_netdev_ops, 471 dev->destructor = free_netdev; 472 dev->features |= NETIF_F_NETNS_LOCAL; 473 } 474 475 static struct net_device *ipmr_reg_vif(struct net *net, struct mr_table *mrt) 476 { 477 struct net_device *dev; 478 struct in_device *in_dev; 479 char name[IFNAMSIZ]; 480 481 if (mrt->id == RT_TABLE_DEFAULT) 482 sprintf(name, "pimreg"); 483 else 484 sprintf(name, "pimreg%u", mrt->id); 485 486 dev = alloc_netdev(0, name, reg_vif_setup); 487 488 if (dev == NULL) 489 return NULL; 490 491 dev_net_set(dev, net); 492 493 if (register_netdevice(dev)) { 494 free_netdev(dev); 495 return NULL; 496 } 497 dev->iflink = 0; 498 499 rcu_read_lock(); 500 in_dev = __in_dev_get_rcu(dev); 501 if (!in_dev) { 502 rcu_read_unlock(); 503 goto failure; 504 } 505 506 ipv4_devconf_setall(in_dev); 507 IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0; 508 rcu_read_unlock(); 509 510 if (dev_open(dev)) 511 goto failure; 512 513 dev_hold(dev); 514 515 return dev; 516 517 failure: 518 /* allow the register to be completed before unregistering. */ 519 rtnl_unlock(); 520 rtnl_lock(); 521 522 unregister_netdevice(dev); 523 return NULL; 524 } 525 #endif 526 527 /* 528 * Delete a VIF entry 529 * @notify: Set to 1, if the caller is a notifier_call 530 */ 531 532 static int vif_delete(struct mr_table *mrt, int vifi, int notify, 533 struct list_head *head) 534 { 535 struct vif_device *v; 536 struct net_device *dev; 537 struct in_device *in_dev; 538 539 if (vifi < 0 || vifi >= mrt->maxvif) 540 return -EADDRNOTAVAIL; 541 542 v = &mrt->vif_table[vifi]; 543 544 write_lock_bh(&mrt_lock); 545 dev = v->dev; 546 v->dev = NULL; 547 548 if (!dev) { 549 write_unlock_bh(&mrt_lock); 550 return -EADDRNOTAVAIL; 551 } 552 553 #ifdef CONFIG_IP_PIMSM 554 if (vifi == mrt->mroute_reg_vif_num) 555 mrt->mroute_reg_vif_num = -1; 556 #endif 557 558 if (vifi + 1 == mrt->maxvif) { 559 int tmp; 560 561 for (tmp = vifi - 1; tmp >= 0; tmp--) { 562 if (VIF_EXISTS(mrt, tmp)) 563 break; 564 } 565 mrt->maxvif = tmp+1; 566 } 567 568 write_unlock_bh(&mrt_lock); 569 570 dev_set_allmulti(dev, -1); 571 572 in_dev = __in_dev_get_rtnl(dev); 573 if (in_dev) { 574 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)--; 575 ip_rt_multicast_event(in_dev); 576 } 577 578 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER) && !notify) 579 unregister_netdevice_queue(dev, head); 580 581 dev_put(dev); 582 return 0; 583 } 584 585 static void ipmr_cache_free_rcu(struct rcu_head *head) 586 { 587 struct mfc_cache *c = container_of(head, struct mfc_cache, rcu); 588 589 kmem_cache_free(mrt_cachep, c); 590 } 591 592 static inline void ipmr_cache_free(struct mfc_cache *c) 593 { 594 call_rcu(&c->rcu, ipmr_cache_free_rcu); 595 } 596 597 /* Destroy an unresolved cache entry, killing queued skbs 598 * and reporting error to netlink readers. 599 */ 600 601 static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c) 602 { 603 struct net *net = read_pnet(&mrt->net); 604 struct sk_buff *skb; 605 struct nlmsgerr *e; 606 607 atomic_dec(&mrt->cache_resolve_queue_len); 608 609 while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved))) { 610 if (ip_hdr(skb)->version == 0) { 611 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); 612 nlh->nlmsg_type = NLMSG_ERROR; 613 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); 614 skb_trim(skb, nlh->nlmsg_len); 615 e = NLMSG_DATA(nlh); 616 e->error = -ETIMEDOUT; 617 memset(&e->msg, 0, sizeof(e->msg)); 618 619 rtnl_unicast(skb, net, NETLINK_CB(skb).pid); 620 } else { 621 kfree_skb(skb); 622 } 623 } 624 625 ipmr_cache_free(c); 626 } 627 628 629 /* Timer process for the unresolved queue. */ 630 631 static void ipmr_expire_process(unsigned long arg) 632 { 633 struct mr_table *mrt = (struct mr_table *)arg; 634 unsigned long now; 635 unsigned long expires; 636 struct mfc_cache *c, *next; 637 638 if (!spin_trylock(&mfc_unres_lock)) { 639 mod_timer(&mrt->ipmr_expire_timer, jiffies+HZ/10); 640 return; 641 } 642 643 if (list_empty(&mrt->mfc_unres_queue)) 644 goto out; 645 646 now = jiffies; 647 expires = 10*HZ; 648 649 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { 650 if (time_after(c->mfc_un.unres.expires, now)) { 651 unsigned long interval = c->mfc_un.unres.expires - now; 652 if (interval < expires) 653 expires = interval; 654 continue; 655 } 656 657 list_del(&c->list); 658 ipmr_destroy_unres(mrt, c); 659 } 660 661 if (!list_empty(&mrt->mfc_unres_queue)) 662 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); 663 664 out: 665 spin_unlock(&mfc_unres_lock); 666 } 667 668 /* Fill oifs list. It is called under write locked mrt_lock. */ 669 670 static void ipmr_update_thresholds(struct mr_table *mrt, struct mfc_cache *cache, 671 unsigned char *ttls) 672 { 673 int vifi; 674 675 cache->mfc_un.res.minvif = MAXVIFS; 676 cache->mfc_un.res.maxvif = 0; 677 memset(cache->mfc_un.res.ttls, 255, MAXVIFS); 678 679 for (vifi = 0; vifi < mrt->maxvif; vifi++) { 680 if (VIF_EXISTS(mrt, vifi) && 681 ttls[vifi] && ttls[vifi] < 255) { 682 cache->mfc_un.res.ttls[vifi] = ttls[vifi]; 683 if (cache->mfc_un.res.minvif > vifi) 684 cache->mfc_un.res.minvif = vifi; 685 if (cache->mfc_un.res.maxvif <= vifi) 686 cache->mfc_un.res.maxvif = vifi + 1; 687 } 688 } 689 } 690 691 static int vif_add(struct net *net, struct mr_table *mrt, 692 struct vifctl *vifc, int mrtsock) 693 { 694 int vifi = vifc->vifc_vifi; 695 struct vif_device *v = &mrt->vif_table[vifi]; 696 struct net_device *dev; 697 struct in_device *in_dev; 698 int err; 699 700 /* Is vif busy ? */ 701 if (VIF_EXISTS(mrt, vifi)) 702 return -EADDRINUSE; 703 704 switch (vifc->vifc_flags) { 705 #ifdef CONFIG_IP_PIMSM 706 case VIFF_REGISTER: 707 /* 708 * Special Purpose VIF in PIM 709 * All the packets will be sent to the daemon 710 */ 711 if (mrt->mroute_reg_vif_num >= 0) 712 return -EADDRINUSE; 713 dev = ipmr_reg_vif(net, mrt); 714 if (!dev) 715 return -ENOBUFS; 716 err = dev_set_allmulti(dev, 1); 717 if (err) { 718 unregister_netdevice(dev); 719 dev_put(dev); 720 return err; 721 } 722 break; 723 #endif 724 case VIFF_TUNNEL: 725 dev = ipmr_new_tunnel(net, vifc); 726 if (!dev) 727 return -ENOBUFS; 728 err = dev_set_allmulti(dev, 1); 729 if (err) { 730 ipmr_del_tunnel(dev, vifc); 731 dev_put(dev); 732 return err; 733 } 734 break; 735 736 case VIFF_USE_IFINDEX: 737 case 0: 738 if (vifc->vifc_flags == VIFF_USE_IFINDEX) { 739 dev = dev_get_by_index(net, vifc->vifc_lcl_ifindex); 740 if (dev && __in_dev_get_rtnl(dev) == NULL) { 741 dev_put(dev); 742 return -EADDRNOTAVAIL; 743 } 744 } else { 745 dev = ip_dev_find(net, vifc->vifc_lcl_addr.s_addr); 746 } 747 if (!dev) 748 return -EADDRNOTAVAIL; 749 err = dev_set_allmulti(dev, 1); 750 if (err) { 751 dev_put(dev); 752 return err; 753 } 754 break; 755 default: 756 return -EINVAL; 757 } 758 759 in_dev = __in_dev_get_rtnl(dev); 760 if (!in_dev) { 761 dev_put(dev); 762 return -EADDRNOTAVAIL; 763 } 764 IPV4_DEVCONF(in_dev->cnf, MC_FORWARDING)++; 765 ip_rt_multicast_event(in_dev); 766 767 /* Fill in the VIF structures */ 768 769 v->rate_limit = vifc->vifc_rate_limit; 770 v->local = vifc->vifc_lcl_addr.s_addr; 771 v->remote = vifc->vifc_rmt_addr.s_addr; 772 v->flags = vifc->vifc_flags; 773 if (!mrtsock) 774 v->flags |= VIFF_STATIC; 775 v->threshold = vifc->vifc_threshold; 776 v->bytes_in = 0; 777 v->bytes_out = 0; 778 v->pkt_in = 0; 779 v->pkt_out = 0; 780 v->link = dev->ifindex; 781 if (v->flags & (VIFF_TUNNEL | VIFF_REGISTER)) 782 v->link = dev->iflink; 783 784 /* And finish update writing critical data */ 785 write_lock_bh(&mrt_lock); 786 v->dev = dev; 787 #ifdef CONFIG_IP_PIMSM 788 if (v->flags & VIFF_REGISTER) 789 mrt->mroute_reg_vif_num = vifi; 790 #endif 791 if (vifi+1 > mrt->maxvif) 792 mrt->maxvif = vifi+1; 793 write_unlock_bh(&mrt_lock); 794 return 0; 795 } 796 797 /* called with rcu_read_lock() */ 798 static struct mfc_cache *ipmr_cache_find(struct mr_table *mrt, 799 __be32 origin, 800 __be32 mcastgrp) 801 { 802 int line = MFC_HASH(mcastgrp, origin); 803 struct mfc_cache *c; 804 805 list_for_each_entry_rcu(c, &mrt->mfc_cache_array[line], list) { 806 if (c->mfc_origin == origin && c->mfc_mcastgrp == mcastgrp) 807 return c; 808 } 809 return NULL; 810 } 811 812 /* 813 * Allocate a multicast cache entry 814 */ 815 static struct mfc_cache *ipmr_cache_alloc(void) 816 { 817 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); 818 819 if (c) 820 c->mfc_un.res.minvif = MAXVIFS; 821 return c; 822 } 823 824 static struct mfc_cache *ipmr_cache_alloc_unres(void) 825 { 826 struct mfc_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); 827 828 if (c) { 829 skb_queue_head_init(&c->mfc_un.unres.unresolved); 830 c->mfc_un.unres.expires = jiffies + 10*HZ; 831 } 832 return c; 833 } 834 835 /* 836 * A cache entry has gone into a resolved state from queued 837 */ 838 839 static void ipmr_cache_resolve(struct net *net, struct mr_table *mrt, 840 struct mfc_cache *uc, struct mfc_cache *c) 841 { 842 struct sk_buff *skb; 843 struct nlmsgerr *e; 844 845 /* Play the pending entries through our router */ 846 847 while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) { 848 if (ip_hdr(skb)->version == 0) { 849 struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct iphdr)); 850 851 if (__ipmr_fill_mroute(mrt, skb, c, NLMSG_DATA(nlh)) > 0) { 852 nlh->nlmsg_len = skb_tail_pointer(skb) - 853 (u8 *)nlh; 854 } else { 855 nlh->nlmsg_type = NLMSG_ERROR; 856 nlh->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr)); 857 skb_trim(skb, nlh->nlmsg_len); 858 e = NLMSG_DATA(nlh); 859 e->error = -EMSGSIZE; 860 memset(&e->msg, 0, sizeof(e->msg)); 861 } 862 863 rtnl_unicast(skb, net, NETLINK_CB(skb).pid); 864 } else { 865 ip_mr_forward(net, mrt, skb, c, 0); 866 } 867 } 868 } 869 870 /* 871 * Bounce a cache query up to mrouted. We could use netlink for this but mrouted 872 * expects the following bizarre scheme. 873 * 874 * Called under mrt_lock. 875 */ 876 877 static int ipmr_cache_report(struct mr_table *mrt, 878 struct sk_buff *pkt, vifi_t vifi, int assert) 879 { 880 struct sk_buff *skb; 881 const int ihl = ip_hdrlen(pkt); 882 struct igmphdr *igmp; 883 struct igmpmsg *msg; 884 struct sock *mroute_sk; 885 int ret; 886 887 #ifdef CONFIG_IP_PIMSM 888 if (assert == IGMPMSG_WHOLEPKT) 889 skb = skb_realloc_headroom(pkt, sizeof(struct iphdr)); 890 else 891 #endif 892 skb = alloc_skb(128, GFP_ATOMIC); 893 894 if (!skb) 895 return -ENOBUFS; 896 897 #ifdef CONFIG_IP_PIMSM 898 if (assert == IGMPMSG_WHOLEPKT) { 899 /* Ugly, but we have no choice with this interface. 900 * Duplicate old header, fix ihl, length etc. 901 * And all this only to mangle msg->im_msgtype and 902 * to set msg->im_mbz to "mbz" :-) 903 */ 904 skb_push(skb, sizeof(struct iphdr)); 905 skb_reset_network_header(skb); 906 skb_reset_transport_header(skb); 907 msg = (struct igmpmsg *)skb_network_header(skb); 908 memcpy(msg, skb_network_header(pkt), sizeof(struct iphdr)); 909 msg->im_msgtype = IGMPMSG_WHOLEPKT; 910 msg->im_mbz = 0; 911 msg->im_vif = mrt->mroute_reg_vif_num; 912 ip_hdr(skb)->ihl = sizeof(struct iphdr) >> 2; 913 ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(pkt)->tot_len) + 914 sizeof(struct iphdr)); 915 } else 916 #endif 917 { 918 919 /* Copy the IP header */ 920 921 skb->network_header = skb->tail; 922 skb_put(skb, ihl); 923 skb_copy_to_linear_data(skb, pkt->data, ihl); 924 ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */ 925 msg = (struct igmpmsg *)skb_network_header(skb); 926 msg->im_vif = vifi; 927 skb_dst_set(skb, dst_clone(skb_dst(pkt))); 928 929 /* Add our header */ 930 931 igmp = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); 932 igmp->type = 933 msg->im_msgtype = assert; 934 igmp->code = 0; 935 ip_hdr(skb)->tot_len = htons(skb->len); /* Fix the length */ 936 skb->transport_header = skb->network_header; 937 } 938 939 rcu_read_lock(); 940 mroute_sk = rcu_dereference(mrt->mroute_sk); 941 if (mroute_sk == NULL) { 942 rcu_read_unlock(); 943 kfree_skb(skb); 944 return -EINVAL; 945 } 946 947 /* Deliver to mrouted */ 948 949 ret = sock_queue_rcv_skb(mroute_sk, skb); 950 rcu_read_unlock(); 951 if (ret < 0) { 952 if (net_ratelimit()) 953 printk(KERN_WARNING "mroute: pending queue full, dropping entries.\n"); 954 kfree_skb(skb); 955 } 956 957 return ret; 958 } 959 960 /* 961 * Queue a packet for resolution. It gets locked cache entry! 962 */ 963 964 static int 965 ipmr_cache_unresolved(struct mr_table *mrt, vifi_t vifi, struct sk_buff *skb) 966 { 967 bool found = false; 968 int err; 969 struct mfc_cache *c; 970 const struct iphdr *iph = ip_hdr(skb); 971 972 spin_lock_bh(&mfc_unres_lock); 973 list_for_each_entry(c, &mrt->mfc_unres_queue, list) { 974 if (c->mfc_mcastgrp == iph->daddr && 975 c->mfc_origin == iph->saddr) { 976 found = true; 977 break; 978 } 979 } 980 981 if (!found) { 982 /* Create a new entry if allowable */ 983 984 if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 || 985 (c = ipmr_cache_alloc_unres()) == NULL) { 986 spin_unlock_bh(&mfc_unres_lock); 987 988 kfree_skb(skb); 989 return -ENOBUFS; 990 } 991 992 /* Fill in the new cache entry */ 993 994 c->mfc_parent = -1; 995 c->mfc_origin = iph->saddr; 996 c->mfc_mcastgrp = iph->daddr; 997 998 /* Reflect first query at mrouted. */ 999 1000 err = ipmr_cache_report(mrt, skb, vifi, IGMPMSG_NOCACHE); 1001 if (err < 0) { 1002 /* If the report failed throw the cache entry 1003 out - Brad Parker 1004 */ 1005 spin_unlock_bh(&mfc_unres_lock); 1006 1007 ipmr_cache_free(c); 1008 kfree_skb(skb); 1009 return err; 1010 } 1011 1012 atomic_inc(&mrt->cache_resolve_queue_len); 1013 list_add(&c->list, &mrt->mfc_unres_queue); 1014 1015 if (atomic_read(&mrt->cache_resolve_queue_len) == 1) 1016 mod_timer(&mrt->ipmr_expire_timer, c->mfc_un.unres.expires); 1017 } 1018 1019 /* See if we can append the packet */ 1020 1021 if (c->mfc_un.unres.unresolved.qlen > 3) { 1022 kfree_skb(skb); 1023 err = -ENOBUFS; 1024 } else { 1025 skb_queue_tail(&c->mfc_un.unres.unresolved, skb); 1026 err = 0; 1027 } 1028 1029 spin_unlock_bh(&mfc_unres_lock); 1030 return err; 1031 } 1032 1033 /* 1034 * MFC cache manipulation by user space mroute daemon 1035 */ 1036 1037 static int ipmr_mfc_delete(struct mr_table *mrt, struct mfcctl *mfc) 1038 { 1039 int line; 1040 struct mfc_cache *c, *next; 1041 1042 line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); 1043 1044 list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[line], list) { 1045 if (c->mfc_origin == mfc->mfcc_origin.s_addr && 1046 c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { 1047 list_del_rcu(&c->list); 1048 1049 ipmr_cache_free(c); 1050 return 0; 1051 } 1052 } 1053 return -ENOENT; 1054 } 1055 1056 static int ipmr_mfc_add(struct net *net, struct mr_table *mrt, 1057 struct mfcctl *mfc, int mrtsock) 1058 { 1059 bool found = false; 1060 int line; 1061 struct mfc_cache *uc, *c; 1062 1063 if (mfc->mfcc_parent >= MAXVIFS) 1064 return -ENFILE; 1065 1066 line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr); 1067 1068 list_for_each_entry(c, &mrt->mfc_cache_array[line], list) { 1069 if (c->mfc_origin == mfc->mfcc_origin.s_addr && 1070 c->mfc_mcastgrp == mfc->mfcc_mcastgrp.s_addr) { 1071 found = true; 1072 break; 1073 } 1074 } 1075 1076 if (found) { 1077 write_lock_bh(&mrt_lock); 1078 c->mfc_parent = mfc->mfcc_parent; 1079 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); 1080 if (!mrtsock) 1081 c->mfc_flags |= MFC_STATIC; 1082 write_unlock_bh(&mrt_lock); 1083 return 0; 1084 } 1085 1086 if (!ipv4_is_multicast(mfc->mfcc_mcastgrp.s_addr)) 1087 return -EINVAL; 1088 1089 c = ipmr_cache_alloc(); 1090 if (c == NULL) 1091 return -ENOMEM; 1092 1093 c->mfc_origin = mfc->mfcc_origin.s_addr; 1094 c->mfc_mcastgrp = mfc->mfcc_mcastgrp.s_addr; 1095 c->mfc_parent = mfc->mfcc_parent; 1096 ipmr_update_thresholds(mrt, c, mfc->mfcc_ttls); 1097 if (!mrtsock) 1098 c->mfc_flags |= MFC_STATIC; 1099 1100 list_add_rcu(&c->list, &mrt->mfc_cache_array[line]); 1101 1102 /* 1103 * Check to see if we resolved a queued list. If so we 1104 * need to send on the frames and tidy up. 1105 */ 1106 found = false; 1107 spin_lock_bh(&mfc_unres_lock); 1108 list_for_each_entry(uc, &mrt->mfc_unres_queue, list) { 1109 if (uc->mfc_origin == c->mfc_origin && 1110 uc->mfc_mcastgrp == c->mfc_mcastgrp) { 1111 list_del(&uc->list); 1112 atomic_dec(&mrt->cache_resolve_queue_len); 1113 found = true; 1114 break; 1115 } 1116 } 1117 if (list_empty(&mrt->mfc_unres_queue)) 1118 del_timer(&mrt->ipmr_expire_timer); 1119 spin_unlock_bh(&mfc_unres_lock); 1120 1121 if (found) { 1122 ipmr_cache_resolve(net, mrt, uc, c); 1123 ipmr_cache_free(uc); 1124 } 1125 return 0; 1126 } 1127 1128 /* 1129 * Close the multicast socket, and clear the vif tables etc 1130 */ 1131 1132 static void mroute_clean_tables(struct mr_table *mrt) 1133 { 1134 int i; 1135 LIST_HEAD(list); 1136 struct mfc_cache *c, *next; 1137 1138 /* Shut down all active vif entries */ 1139 1140 for (i = 0; i < mrt->maxvif; i++) { 1141 if (!(mrt->vif_table[i].flags & VIFF_STATIC)) 1142 vif_delete(mrt, i, 0, &list); 1143 } 1144 unregister_netdevice_many(&list); 1145 1146 /* Wipe the cache */ 1147 1148 for (i = 0; i < MFC_LINES; i++) { 1149 list_for_each_entry_safe(c, next, &mrt->mfc_cache_array[i], list) { 1150 if (c->mfc_flags & MFC_STATIC) 1151 continue; 1152 list_del_rcu(&c->list); 1153 ipmr_cache_free(c); 1154 } 1155 } 1156 1157 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { 1158 spin_lock_bh(&mfc_unres_lock); 1159 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { 1160 list_del(&c->list); 1161 ipmr_destroy_unres(mrt, c); 1162 } 1163 spin_unlock_bh(&mfc_unres_lock); 1164 } 1165 } 1166 1167 /* called from ip_ra_control(), before an RCU grace period, 1168 * we dont need to call synchronize_rcu() here 1169 */ 1170 static void mrtsock_destruct(struct sock *sk) 1171 { 1172 struct net *net = sock_net(sk); 1173 struct mr_table *mrt; 1174 1175 rtnl_lock(); 1176 ipmr_for_each_table(mrt, net) { 1177 if (sk == rtnl_dereference(mrt->mroute_sk)) { 1178 IPV4_DEVCONF_ALL(net, MC_FORWARDING)--; 1179 rcu_assign_pointer(mrt->mroute_sk, NULL); 1180 mroute_clean_tables(mrt); 1181 } 1182 } 1183 rtnl_unlock(); 1184 } 1185 1186 /* 1187 * Socket options and virtual interface manipulation. The whole 1188 * virtual interface system is a complete heap, but unfortunately 1189 * that's how BSD mrouted happens to think. Maybe one day with a proper 1190 * MOSPF/PIM router set up we can clean this up. 1191 */ 1192 1193 int ip_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen) 1194 { 1195 int ret; 1196 struct vifctl vif; 1197 struct mfcctl mfc; 1198 struct net *net = sock_net(sk); 1199 struct mr_table *mrt; 1200 1201 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); 1202 if (mrt == NULL) 1203 return -ENOENT; 1204 1205 if (optname != MRT_INIT) { 1206 if (sk != rcu_dereference_raw(mrt->mroute_sk) && 1207 !capable(CAP_NET_ADMIN)) 1208 return -EACCES; 1209 } 1210 1211 switch (optname) { 1212 case MRT_INIT: 1213 if (sk->sk_type != SOCK_RAW || 1214 inet_sk(sk)->inet_num != IPPROTO_IGMP) 1215 return -EOPNOTSUPP; 1216 if (optlen != sizeof(int)) 1217 return -ENOPROTOOPT; 1218 1219 rtnl_lock(); 1220 if (rtnl_dereference(mrt->mroute_sk)) { 1221 rtnl_unlock(); 1222 return -EADDRINUSE; 1223 } 1224 1225 ret = ip_ra_control(sk, 1, mrtsock_destruct); 1226 if (ret == 0) { 1227 rcu_assign_pointer(mrt->mroute_sk, sk); 1228 IPV4_DEVCONF_ALL(net, MC_FORWARDING)++; 1229 } 1230 rtnl_unlock(); 1231 return ret; 1232 case MRT_DONE: 1233 if (sk != rcu_dereference_raw(mrt->mroute_sk)) 1234 return -EACCES; 1235 return ip_ra_control(sk, 0, NULL); 1236 case MRT_ADD_VIF: 1237 case MRT_DEL_VIF: 1238 if (optlen != sizeof(vif)) 1239 return -EINVAL; 1240 if (copy_from_user(&vif, optval, sizeof(vif))) 1241 return -EFAULT; 1242 if (vif.vifc_vifi >= MAXVIFS) 1243 return -ENFILE; 1244 rtnl_lock(); 1245 if (optname == MRT_ADD_VIF) { 1246 ret = vif_add(net, mrt, &vif, 1247 sk == rtnl_dereference(mrt->mroute_sk)); 1248 } else { 1249 ret = vif_delete(mrt, vif.vifc_vifi, 0, NULL); 1250 } 1251 rtnl_unlock(); 1252 return ret; 1253 1254 /* 1255 * Manipulate the forwarding caches. These live 1256 * in a sort of kernel/user symbiosis. 1257 */ 1258 case MRT_ADD_MFC: 1259 case MRT_DEL_MFC: 1260 if (optlen != sizeof(mfc)) 1261 return -EINVAL; 1262 if (copy_from_user(&mfc, optval, sizeof(mfc))) 1263 return -EFAULT; 1264 rtnl_lock(); 1265 if (optname == MRT_DEL_MFC) 1266 ret = ipmr_mfc_delete(mrt, &mfc); 1267 else 1268 ret = ipmr_mfc_add(net, mrt, &mfc, 1269 sk == rtnl_dereference(mrt->mroute_sk)); 1270 rtnl_unlock(); 1271 return ret; 1272 /* 1273 * Control PIM assert. 1274 */ 1275 case MRT_ASSERT: 1276 { 1277 int v; 1278 if (get_user(v, (int __user *)optval)) 1279 return -EFAULT; 1280 mrt->mroute_do_assert = (v) ? 1 : 0; 1281 return 0; 1282 } 1283 #ifdef CONFIG_IP_PIMSM 1284 case MRT_PIM: 1285 { 1286 int v; 1287 1288 if (get_user(v, (int __user *)optval)) 1289 return -EFAULT; 1290 v = (v) ? 1 : 0; 1291 1292 rtnl_lock(); 1293 ret = 0; 1294 if (v != mrt->mroute_do_pim) { 1295 mrt->mroute_do_pim = v; 1296 mrt->mroute_do_assert = v; 1297 } 1298 rtnl_unlock(); 1299 return ret; 1300 } 1301 #endif 1302 #ifdef CONFIG_IP_MROUTE_MULTIPLE_TABLES 1303 case MRT_TABLE: 1304 { 1305 u32 v; 1306 1307 if (optlen != sizeof(u32)) 1308 return -EINVAL; 1309 if (get_user(v, (u32 __user *)optval)) 1310 return -EFAULT; 1311 1312 rtnl_lock(); 1313 ret = 0; 1314 if (sk == rtnl_dereference(mrt->mroute_sk)) { 1315 ret = -EBUSY; 1316 } else { 1317 if (!ipmr_new_table(net, v)) 1318 ret = -ENOMEM; 1319 raw_sk(sk)->ipmr_table = v; 1320 } 1321 rtnl_unlock(); 1322 return ret; 1323 } 1324 #endif 1325 /* 1326 * Spurious command, or MRT_VERSION which you cannot 1327 * set. 1328 */ 1329 default: 1330 return -ENOPROTOOPT; 1331 } 1332 } 1333 1334 /* 1335 * Getsock opt support for the multicast routing system. 1336 */ 1337 1338 int ip_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, int __user *optlen) 1339 { 1340 int olr; 1341 int val; 1342 struct net *net = sock_net(sk); 1343 struct mr_table *mrt; 1344 1345 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); 1346 if (mrt == NULL) 1347 return -ENOENT; 1348 1349 if (optname != MRT_VERSION && 1350 #ifdef CONFIG_IP_PIMSM 1351 optname != MRT_PIM && 1352 #endif 1353 optname != MRT_ASSERT) 1354 return -ENOPROTOOPT; 1355 1356 if (get_user(olr, optlen)) 1357 return -EFAULT; 1358 1359 olr = min_t(unsigned int, olr, sizeof(int)); 1360 if (olr < 0) 1361 return -EINVAL; 1362 1363 if (put_user(olr, optlen)) 1364 return -EFAULT; 1365 if (optname == MRT_VERSION) 1366 val = 0x0305; 1367 #ifdef CONFIG_IP_PIMSM 1368 else if (optname == MRT_PIM) 1369 val = mrt->mroute_do_pim; 1370 #endif 1371 else 1372 val = mrt->mroute_do_assert; 1373 if (copy_to_user(optval, &val, olr)) 1374 return -EFAULT; 1375 return 0; 1376 } 1377 1378 /* 1379 * The IP multicast ioctl support routines. 1380 */ 1381 1382 int ipmr_ioctl(struct sock *sk, int cmd, void __user *arg) 1383 { 1384 struct sioc_sg_req sr; 1385 struct sioc_vif_req vr; 1386 struct vif_device *vif; 1387 struct mfc_cache *c; 1388 struct net *net = sock_net(sk); 1389 struct mr_table *mrt; 1390 1391 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); 1392 if (mrt == NULL) 1393 return -ENOENT; 1394 1395 switch (cmd) { 1396 case SIOCGETVIFCNT: 1397 if (copy_from_user(&vr, arg, sizeof(vr))) 1398 return -EFAULT; 1399 if (vr.vifi >= mrt->maxvif) 1400 return -EINVAL; 1401 read_lock(&mrt_lock); 1402 vif = &mrt->vif_table[vr.vifi]; 1403 if (VIF_EXISTS(mrt, vr.vifi)) { 1404 vr.icount = vif->pkt_in; 1405 vr.ocount = vif->pkt_out; 1406 vr.ibytes = vif->bytes_in; 1407 vr.obytes = vif->bytes_out; 1408 read_unlock(&mrt_lock); 1409 1410 if (copy_to_user(arg, &vr, sizeof(vr))) 1411 return -EFAULT; 1412 return 0; 1413 } 1414 read_unlock(&mrt_lock); 1415 return -EADDRNOTAVAIL; 1416 case SIOCGETSGCNT: 1417 if (copy_from_user(&sr, arg, sizeof(sr))) 1418 return -EFAULT; 1419 1420 rcu_read_lock(); 1421 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); 1422 if (c) { 1423 sr.pktcnt = c->mfc_un.res.pkt; 1424 sr.bytecnt = c->mfc_un.res.bytes; 1425 sr.wrong_if = c->mfc_un.res.wrong_if; 1426 rcu_read_unlock(); 1427 1428 if (copy_to_user(arg, &sr, sizeof(sr))) 1429 return -EFAULT; 1430 return 0; 1431 } 1432 rcu_read_unlock(); 1433 return -EADDRNOTAVAIL; 1434 default: 1435 return -ENOIOCTLCMD; 1436 } 1437 } 1438 1439 #ifdef CONFIG_COMPAT 1440 struct compat_sioc_sg_req { 1441 struct in_addr src; 1442 struct in_addr grp; 1443 compat_ulong_t pktcnt; 1444 compat_ulong_t bytecnt; 1445 compat_ulong_t wrong_if; 1446 }; 1447 1448 struct compat_sioc_vif_req { 1449 vifi_t vifi; /* Which iface */ 1450 compat_ulong_t icount; 1451 compat_ulong_t ocount; 1452 compat_ulong_t ibytes; 1453 compat_ulong_t obytes; 1454 }; 1455 1456 int ipmr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) 1457 { 1458 struct compat_sioc_sg_req sr; 1459 struct compat_sioc_vif_req vr; 1460 struct vif_device *vif; 1461 struct mfc_cache *c; 1462 struct net *net = sock_net(sk); 1463 struct mr_table *mrt; 1464 1465 mrt = ipmr_get_table(net, raw_sk(sk)->ipmr_table ? : RT_TABLE_DEFAULT); 1466 if (mrt == NULL) 1467 return -ENOENT; 1468 1469 switch (cmd) { 1470 case SIOCGETVIFCNT: 1471 if (copy_from_user(&vr, arg, sizeof(vr))) 1472 return -EFAULT; 1473 if (vr.vifi >= mrt->maxvif) 1474 return -EINVAL; 1475 read_lock(&mrt_lock); 1476 vif = &mrt->vif_table[vr.vifi]; 1477 if (VIF_EXISTS(mrt, vr.vifi)) { 1478 vr.icount = vif->pkt_in; 1479 vr.ocount = vif->pkt_out; 1480 vr.ibytes = vif->bytes_in; 1481 vr.obytes = vif->bytes_out; 1482 read_unlock(&mrt_lock); 1483 1484 if (copy_to_user(arg, &vr, sizeof(vr))) 1485 return -EFAULT; 1486 return 0; 1487 } 1488 read_unlock(&mrt_lock); 1489 return -EADDRNOTAVAIL; 1490 case SIOCGETSGCNT: 1491 if (copy_from_user(&sr, arg, sizeof(sr))) 1492 return -EFAULT; 1493 1494 rcu_read_lock(); 1495 c = ipmr_cache_find(mrt, sr.src.s_addr, sr.grp.s_addr); 1496 if (c) { 1497 sr.pktcnt = c->mfc_un.res.pkt; 1498 sr.bytecnt = c->mfc_un.res.bytes; 1499 sr.wrong_if = c->mfc_un.res.wrong_if; 1500 rcu_read_unlock(); 1501 1502 if (copy_to_user(arg, &sr, sizeof(sr))) 1503 return -EFAULT; 1504 return 0; 1505 } 1506 rcu_read_unlock(); 1507 return -EADDRNOTAVAIL; 1508 default: 1509 return -ENOIOCTLCMD; 1510 } 1511 } 1512 #endif 1513 1514 1515 static int ipmr_device_event(struct notifier_block *this, unsigned long event, void *ptr) 1516 { 1517 struct net_device *dev = ptr; 1518 struct net *net = dev_net(dev); 1519 struct mr_table *mrt; 1520 struct vif_device *v; 1521 int ct; 1522 LIST_HEAD(list); 1523 1524 if (event != NETDEV_UNREGISTER) 1525 return NOTIFY_DONE; 1526 1527 ipmr_for_each_table(mrt, net) { 1528 v = &mrt->vif_table[0]; 1529 for (ct = 0; ct < mrt->maxvif; ct++, v++) { 1530 if (v->dev == dev) 1531 vif_delete(mrt, ct, 1, &list); 1532 } 1533 } 1534 unregister_netdevice_many(&list); 1535 return NOTIFY_DONE; 1536 } 1537 1538 1539 static struct notifier_block ip_mr_notifier = { 1540 .notifier_call = ipmr_device_event, 1541 }; 1542 1543 /* 1544 * Encapsulate a packet by attaching a valid IPIP header to it. 1545 * This avoids tunnel drivers and other mess and gives us the speed so 1546 * important for multicast video. 1547 */ 1548 1549 static void ip_encap(struct sk_buff *skb, __be32 saddr, __be32 daddr) 1550 { 1551 struct iphdr *iph; 1552 struct iphdr *old_iph = ip_hdr(skb); 1553 1554 skb_push(skb, sizeof(struct iphdr)); 1555 skb->transport_header = skb->network_header; 1556 skb_reset_network_header(skb); 1557 iph = ip_hdr(skb); 1558 1559 iph->version = 4; 1560 iph->tos = old_iph->tos; 1561 iph->ttl = old_iph->ttl; 1562 iph->frag_off = 0; 1563 iph->daddr = daddr; 1564 iph->saddr = saddr; 1565 iph->protocol = IPPROTO_IPIP; 1566 iph->ihl = 5; 1567 iph->tot_len = htons(skb->len); 1568 ip_select_ident(iph, skb_dst(skb), NULL); 1569 ip_send_check(iph); 1570 1571 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); 1572 nf_reset(skb); 1573 } 1574 1575 static inline int ipmr_forward_finish(struct sk_buff *skb) 1576 { 1577 struct ip_options *opt = &(IPCB(skb)->opt); 1578 1579 IP_INC_STATS_BH(dev_net(skb_dst(skb)->dev), IPSTATS_MIB_OUTFORWDATAGRAMS); 1580 1581 if (unlikely(opt->optlen)) 1582 ip_forward_options(skb); 1583 1584 return dst_output(skb); 1585 } 1586 1587 /* 1588 * Processing handlers for ipmr_forward 1589 */ 1590 1591 static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, 1592 struct sk_buff *skb, struct mfc_cache *c, int vifi) 1593 { 1594 const struct iphdr *iph = ip_hdr(skb); 1595 struct vif_device *vif = &mrt->vif_table[vifi]; 1596 struct net_device *dev; 1597 struct rtable *rt; 1598 int encap = 0; 1599 1600 if (vif->dev == NULL) 1601 goto out_free; 1602 1603 #ifdef CONFIG_IP_PIMSM 1604 if (vif->flags & VIFF_REGISTER) { 1605 vif->pkt_out++; 1606 vif->bytes_out += skb->len; 1607 vif->dev->stats.tx_bytes += skb->len; 1608 vif->dev->stats.tx_packets++; 1609 ipmr_cache_report(mrt, skb, vifi, IGMPMSG_WHOLEPKT); 1610 goto out_free; 1611 } 1612 #endif 1613 1614 if (vif->flags & VIFF_TUNNEL) { 1615 rt = ip_route_output_ports(net, NULL, 1616 vif->remote, vif->local, 1617 0, 0, 1618 IPPROTO_IPIP, 1619 RT_TOS(iph->tos), vif->link); 1620 if (IS_ERR(rt)) 1621 goto out_free; 1622 encap = sizeof(struct iphdr); 1623 } else { 1624 rt = ip_route_output_ports(net, NULL, iph->daddr, 0, 1625 0, 0, 1626 IPPROTO_IPIP, 1627 RT_TOS(iph->tos), vif->link); 1628 if (IS_ERR(rt)) 1629 goto out_free; 1630 } 1631 1632 dev = rt->dst.dev; 1633 1634 if (skb->len+encap > dst_mtu(&rt->dst) && (ntohs(iph->frag_off) & IP_DF)) { 1635 /* Do not fragment multicasts. Alas, IPv4 does not 1636 * allow to send ICMP, so that packets will disappear 1637 * to blackhole. 1638 */ 1639 1640 IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_FRAGFAILS); 1641 ip_rt_put(rt); 1642 goto out_free; 1643 } 1644 1645 encap += LL_RESERVED_SPACE(dev) + rt->dst.header_len; 1646 1647 if (skb_cow(skb, encap)) { 1648 ip_rt_put(rt); 1649 goto out_free; 1650 } 1651 1652 vif->pkt_out++; 1653 vif->bytes_out += skb->len; 1654 1655 skb_dst_drop(skb); 1656 skb_dst_set(skb, &rt->dst); 1657 ip_decrease_ttl(ip_hdr(skb)); 1658 1659 /* FIXME: forward and output firewalls used to be called here. 1660 * What do we do with netfilter? -- RR 1661 */ 1662 if (vif->flags & VIFF_TUNNEL) { 1663 ip_encap(skb, vif->local, vif->remote); 1664 /* FIXME: extra output firewall step used to be here. --RR */ 1665 vif->dev->stats.tx_packets++; 1666 vif->dev->stats.tx_bytes += skb->len; 1667 } 1668 1669 IPCB(skb)->flags |= IPSKB_FORWARDED; 1670 1671 /* 1672 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally 1673 * not only before forwarding, but after forwarding on all output 1674 * interfaces. It is clear, if mrouter runs a multicasting 1675 * program, it should receive packets not depending to what interface 1676 * program is joined. 1677 * If we will not make it, the program will have to join on all 1678 * interfaces. On the other hand, multihoming host (or router, but 1679 * not mrouter) cannot join to more than one interface - it will 1680 * result in receiving multiple packets. 1681 */ 1682 NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, skb, skb->dev, dev, 1683 ipmr_forward_finish); 1684 return; 1685 1686 out_free: 1687 kfree_skb(skb); 1688 } 1689 1690 static int ipmr_find_vif(struct mr_table *mrt, struct net_device *dev) 1691 { 1692 int ct; 1693 1694 for (ct = mrt->maxvif-1; ct >= 0; ct--) { 1695 if (mrt->vif_table[ct].dev == dev) 1696 break; 1697 } 1698 return ct; 1699 } 1700 1701 /* "local" means that we should preserve one skb (for local delivery) */ 1702 1703 static int ip_mr_forward(struct net *net, struct mr_table *mrt, 1704 struct sk_buff *skb, struct mfc_cache *cache, 1705 int local) 1706 { 1707 int psend = -1; 1708 int vif, ct; 1709 1710 vif = cache->mfc_parent; 1711 cache->mfc_un.res.pkt++; 1712 cache->mfc_un.res.bytes += skb->len; 1713 1714 /* 1715 * Wrong interface: drop packet and (maybe) send PIM assert. 1716 */ 1717 if (mrt->vif_table[vif].dev != skb->dev) { 1718 int true_vifi; 1719 1720 if (rt_is_output_route(skb_rtable(skb))) { 1721 /* It is our own packet, looped back. 1722 * Very complicated situation... 1723 * 1724 * The best workaround until routing daemons will be 1725 * fixed is not to redistribute packet, if it was 1726 * send through wrong interface. It means, that 1727 * multicast applications WILL NOT work for 1728 * (S,G), which have default multicast route pointing 1729 * to wrong oif. In any case, it is not a good 1730 * idea to use multicasting applications on router. 1731 */ 1732 goto dont_forward; 1733 } 1734 1735 cache->mfc_un.res.wrong_if++; 1736 true_vifi = ipmr_find_vif(mrt, skb->dev); 1737 1738 if (true_vifi >= 0 && mrt->mroute_do_assert && 1739 /* pimsm uses asserts, when switching from RPT to SPT, 1740 * so that we cannot check that packet arrived on an oif. 1741 * It is bad, but otherwise we would need to move pretty 1742 * large chunk of pimd to kernel. Ough... --ANK 1743 */ 1744 (mrt->mroute_do_pim || 1745 cache->mfc_un.res.ttls[true_vifi] < 255) && 1746 time_after(jiffies, 1747 cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) { 1748 cache->mfc_un.res.last_assert = jiffies; 1749 ipmr_cache_report(mrt, skb, true_vifi, IGMPMSG_WRONGVIF); 1750 } 1751 goto dont_forward; 1752 } 1753 1754 mrt->vif_table[vif].pkt_in++; 1755 mrt->vif_table[vif].bytes_in += skb->len; 1756 1757 /* 1758 * Forward the frame 1759 */ 1760 for (ct = cache->mfc_un.res.maxvif - 1; 1761 ct >= cache->mfc_un.res.minvif; ct--) { 1762 if (ip_hdr(skb)->ttl > cache->mfc_un.res.ttls[ct]) { 1763 if (psend != -1) { 1764 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 1765 1766 if (skb2) 1767 ipmr_queue_xmit(net, mrt, skb2, cache, 1768 psend); 1769 } 1770 psend = ct; 1771 } 1772 } 1773 if (psend != -1) { 1774 if (local) { 1775 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 1776 1777 if (skb2) 1778 ipmr_queue_xmit(net, mrt, skb2, cache, psend); 1779 } else { 1780 ipmr_queue_xmit(net, mrt, skb, cache, psend); 1781 return 0; 1782 } 1783 } 1784 1785 dont_forward: 1786 if (!local) 1787 kfree_skb(skb); 1788 return 0; 1789 } 1790 1791 static struct mr_table *ipmr_rt_fib_lookup(struct net *net, struct rtable *rt) 1792 { 1793 struct flowi4 fl4 = { 1794 .daddr = rt->rt_key_dst, 1795 .saddr = rt->rt_key_src, 1796 .flowi4_tos = rt->rt_tos, 1797 .flowi4_oif = rt->rt_oif, 1798 .flowi4_iif = rt->rt_iif, 1799 .flowi4_mark = rt->rt_mark, 1800 }; 1801 struct mr_table *mrt; 1802 int err; 1803 1804 err = ipmr_fib_lookup(net, &fl4, &mrt); 1805 if (err) 1806 return ERR_PTR(err); 1807 return mrt; 1808 } 1809 1810 /* 1811 * Multicast packets for forwarding arrive here 1812 * Called with rcu_read_lock(); 1813 */ 1814 1815 int ip_mr_input(struct sk_buff *skb) 1816 { 1817 struct mfc_cache *cache; 1818 struct net *net = dev_net(skb->dev); 1819 int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL; 1820 struct mr_table *mrt; 1821 1822 /* Packet is looped back after forward, it should not be 1823 * forwarded second time, but still can be delivered locally. 1824 */ 1825 if (IPCB(skb)->flags & IPSKB_FORWARDED) 1826 goto dont_forward; 1827 1828 mrt = ipmr_rt_fib_lookup(net, skb_rtable(skb)); 1829 if (IS_ERR(mrt)) { 1830 kfree_skb(skb); 1831 return PTR_ERR(mrt); 1832 } 1833 if (!local) { 1834 if (IPCB(skb)->opt.router_alert) { 1835 if (ip_call_ra_chain(skb)) 1836 return 0; 1837 } else if (ip_hdr(skb)->protocol == IPPROTO_IGMP) { 1838 /* IGMPv1 (and broken IGMPv2 implementations sort of 1839 * Cisco IOS <= 11.2(8)) do not put router alert 1840 * option to IGMP packets destined to routable 1841 * groups. It is very bad, because it means 1842 * that we can forward NO IGMP messages. 1843 */ 1844 struct sock *mroute_sk; 1845 1846 mroute_sk = rcu_dereference(mrt->mroute_sk); 1847 if (mroute_sk) { 1848 nf_reset(skb); 1849 raw_rcv(mroute_sk, skb); 1850 return 0; 1851 } 1852 } 1853 } 1854 1855 /* already under rcu_read_lock() */ 1856 cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); 1857 1858 /* 1859 * No usable cache entry 1860 */ 1861 if (cache == NULL) { 1862 int vif; 1863 1864 if (local) { 1865 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 1866 ip_local_deliver(skb); 1867 if (skb2 == NULL) 1868 return -ENOBUFS; 1869 skb = skb2; 1870 } 1871 1872 read_lock(&mrt_lock); 1873 vif = ipmr_find_vif(mrt, skb->dev); 1874 if (vif >= 0) { 1875 int err2 = ipmr_cache_unresolved(mrt, vif, skb); 1876 read_unlock(&mrt_lock); 1877 1878 return err2; 1879 } 1880 read_unlock(&mrt_lock); 1881 kfree_skb(skb); 1882 return -ENODEV; 1883 } 1884 1885 read_lock(&mrt_lock); 1886 ip_mr_forward(net, mrt, skb, cache, local); 1887 read_unlock(&mrt_lock); 1888 1889 if (local) 1890 return ip_local_deliver(skb); 1891 1892 return 0; 1893 1894 dont_forward: 1895 if (local) 1896 return ip_local_deliver(skb); 1897 kfree_skb(skb); 1898 return 0; 1899 } 1900 1901 #ifdef CONFIG_IP_PIMSM 1902 /* called with rcu_read_lock() */ 1903 static int __pim_rcv(struct mr_table *mrt, struct sk_buff *skb, 1904 unsigned int pimlen) 1905 { 1906 struct net_device *reg_dev = NULL; 1907 struct iphdr *encap; 1908 1909 encap = (struct iphdr *)(skb_transport_header(skb) + pimlen); 1910 /* 1911 * Check that: 1912 * a. packet is really sent to a multicast group 1913 * b. packet is not a NULL-REGISTER 1914 * c. packet is not truncated 1915 */ 1916 if (!ipv4_is_multicast(encap->daddr) || 1917 encap->tot_len == 0 || 1918 ntohs(encap->tot_len) + pimlen > skb->len) 1919 return 1; 1920 1921 read_lock(&mrt_lock); 1922 if (mrt->mroute_reg_vif_num >= 0) 1923 reg_dev = mrt->vif_table[mrt->mroute_reg_vif_num].dev; 1924 read_unlock(&mrt_lock); 1925 1926 if (reg_dev == NULL) 1927 return 1; 1928 1929 skb->mac_header = skb->network_header; 1930 skb_pull(skb, (u8 *)encap - skb->data); 1931 skb_reset_network_header(skb); 1932 skb->protocol = htons(ETH_P_IP); 1933 skb->ip_summed = CHECKSUM_NONE; 1934 skb->pkt_type = PACKET_HOST; 1935 1936 skb_tunnel_rx(skb, reg_dev); 1937 1938 netif_rx(skb); 1939 1940 return NET_RX_SUCCESS; 1941 } 1942 #endif 1943 1944 #ifdef CONFIG_IP_PIMSM_V1 1945 /* 1946 * Handle IGMP messages of PIMv1 1947 */ 1948 1949 int pim_rcv_v1(struct sk_buff *skb) 1950 { 1951 struct igmphdr *pim; 1952 struct net *net = dev_net(skb->dev); 1953 struct mr_table *mrt; 1954 1955 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) 1956 goto drop; 1957 1958 pim = igmp_hdr(skb); 1959 1960 mrt = ipmr_rt_fib_lookup(net, skb_rtable(skb)); 1961 if (IS_ERR(mrt)) 1962 goto drop; 1963 if (!mrt->mroute_do_pim || 1964 pim->group != PIM_V1_VERSION || pim->code != PIM_V1_REGISTER) 1965 goto drop; 1966 1967 if (__pim_rcv(mrt, skb, sizeof(*pim))) { 1968 drop: 1969 kfree_skb(skb); 1970 } 1971 return 0; 1972 } 1973 #endif 1974 1975 #ifdef CONFIG_IP_PIMSM_V2 1976 static int pim_rcv(struct sk_buff *skb) 1977 { 1978 struct pimreghdr *pim; 1979 struct net *net = dev_net(skb->dev); 1980 struct mr_table *mrt; 1981 1982 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(struct iphdr))) 1983 goto drop; 1984 1985 pim = (struct pimreghdr *)skb_transport_header(skb); 1986 if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) || 1987 (pim->flags & PIM_NULL_REGISTER) || 1988 (ip_compute_csum((void *)pim, sizeof(*pim)) != 0 && 1989 csum_fold(skb_checksum(skb, 0, skb->len, 0)))) 1990 goto drop; 1991 1992 mrt = ipmr_rt_fib_lookup(net, skb_rtable(skb)); 1993 if (IS_ERR(mrt)) 1994 goto drop; 1995 if (__pim_rcv(mrt, skb, sizeof(*pim))) { 1996 drop: 1997 kfree_skb(skb); 1998 } 1999 return 0; 2000 } 2001 #endif 2002 2003 static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, 2004 struct mfc_cache *c, struct rtmsg *rtm) 2005 { 2006 int ct; 2007 struct rtnexthop *nhp; 2008 u8 *b = skb_tail_pointer(skb); 2009 struct rtattr *mp_head; 2010 2011 /* If cache is unresolved, don't try to parse IIF and OIF */ 2012 if (c->mfc_parent >= MAXVIFS) 2013 return -ENOENT; 2014 2015 if (VIF_EXISTS(mrt, c->mfc_parent)) 2016 RTA_PUT(skb, RTA_IIF, 4, &mrt->vif_table[c->mfc_parent].dev->ifindex); 2017 2018 mp_head = (struct rtattr *)skb_put(skb, RTA_LENGTH(0)); 2019 2020 for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { 2021 if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { 2022 if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4)) 2023 goto rtattr_failure; 2024 nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp))); 2025 nhp->rtnh_flags = 0; 2026 nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; 2027 nhp->rtnh_ifindex = mrt->vif_table[ct].dev->ifindex; 2028 nhp->rtnh_len = sizeof(*nhp); 2029 } 2030 } 2031 mp_head->rta_type = RTA_MULTIPATH; 2032 mp_head->rta_len = skb_tail_pointer(skb) - (u8 *)mp_head; 2033 rtm->rtm_type = RTN_MULTICAST; 2034 return 1; 2035 2036 rtattr_failure: 2037 nlmsg_trim(skb, b); 2038 return -EMSGSIZE; 2039 } 2040 2041 int ipmr_get_route(struct net *net, 2042 struct sk_buff *skb, struct rtmsg *rtm, int nowait) 2043 { 2044 int err; 2045 struct mr_table *mrt; 2046 struct mfc_cache *cache; 2047 struct rtable *rt = skb_rtable(skb); 2048 2049 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); 2050 if (mrt == NULL) 2051 return -ENOENT; 2052 2053 rcu_read_lock(); 2054 cache = ipmr_cache_find(mrt, rt->rt_src, rt->rt_dst); 2055 2056 if (cache == NULL) { 2057 struct sk_buff *skb2; 2058 struct iphdr *iph; 2059 struct net_device *dev; 2060 int vif = -1; 2061 2062 if (nowait) { 2063 rcu_read_unlock(); 2064 return -EAGAIN; 2065 } 2066 2067 dev = skb->dev; 2068 read_lock(&mrt_lock); 2069 if (dev) 2070 vif = ipmr_find_vif(mrt, dev); 2071 if (vif < 0) { 2072 read_unlock(&mrt_lock); 2073 rcu_read_unlock(); 2074 return -ENODEV; 2075 } 2076 skb2 = skb_clone(skb, GFP_ATOMIC); 2077 if (!skb2) { 2078 read_unlock(&mrt_lock); 2079 rcu_read_unlock(); 2080 return -ENOMEM; 2081 } 2082 2083 skb_push(skb2, sizeof(struct iphdr)); 2084 skb_reset_network_header(skb2); 2085 iph = ip_hdr(skb2); 2086 iph->ihl = sizeof(struct iphdr) >> 2; 2087 iph->saddr = rt->rt_src; 2088 iph->daddr = rt->rt_dst; 2089 iph->version = 0; 2090 err = ipmr_cache_unresolved(mrt, vif, skb2); 2091 read_unlock(&mrt_lock); 2092 rcu_read_unlock(); 2093 return err; 2094 } 2095 2096 read_lock(&mrt_lock); 2097 if (!nowait && (rtm->rtm_flags & RTM_F_NOTIFY)) 2098 cache->mfc_flags |= MFC_NOTIFY; 2099 err = __ipmr_fill_mroute(mrt, skb, cache, rtm); 2100 read_unlock(&mrt_lock); 2101 rcu_read_unlock(); 2102 return err; 2103 } 2104 2105 static int ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, 2106 u32 pid, u32 seq, struct mfc_cache *c) 2107 { 2108 struct nlmsghdr *nlh; 2109 struct rtmsg *rtm; 2110 2111 nlh = nlmsg_put(skb, pid, seq, RTM_NEWROUTE, sizeof(*rtm), NLM_F_MULTI); 2112 if (nlh == NULL) 2113 return -EMSGSIZE; 2114 2115 rtm = nlmsg_data(nlh); 2116 rtm->rtm_family = RTNL_FAMILY_IPMR; 2117 rtm->rtm_dst_len = 32; 2118 rtm->rtm_src_len = 32; 2119 rtm->rtm_tos = 0; 2120 rtm->rtm_table = mrt->id; 2121 NLA_PUT_U32(skb, RTA_TABLE, mrt->id); 2122 rtm->rtm_type = RTN_MULTICAST; 2123 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2124 rtm->rtm_protocol = RTPROT_UNSPEC; 2125 rtm->rtm_flags = 0; 2126 2127 NLA_PUT_BE32(skb, RTA_SRC, c->mfc_origin); 2128 NLA_PUT_BE32(skb, RTA_DST, c->mfc_mcastgrp); 2129 2130 if (__ipmr_fill_mroute(mrt, skb, c, rtm) < 0) 2131 goto nla_put_failure; 2132 2133 return nlmsg_end(skb, nlh); 2134 2135 nla_put_failure: 2136 nlmsg_cancel(skb, nlh); 2137 return -EMSGSIZE; 2138 } 2139 2140 static int ipmr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) 2141 { 2142 struct net *net = sock_net(skb->sk); 2143 struct mr_table *mrt; 2144 struct mfc_cache *mfc; 2145 unsigned int t = 0, s_t; 2146 unsigned int h = 0, s_h; 2147 unsigned int e = 0, s_e; 2148 2149 s_t = cb->args[0]; 2150 s_h = cb->args[1]; 2151 s_e = cb->args[2]; 2152 2153 rcu_read_lock(); 2154 ipmr_for_each_table(mrt, net) { 2155 if (t < s_t) 2156 goto next_table; 2157 if (t > s_t) 2158 s_h = 0; 2159 for (h = s_h; h < MFC_LINES; h++) { 2160 list_for_each_entry_rcu(mfc, &mrt->mfc_cache_array[h], list) { 2161 if (e < s_e) 2162 goto next_entry; 2163 if (ipmr_fill_mroute(mrt, skb, 2164 NETLINK_CB(cb->skb).pid, 2165 cb->nlh->nlmsg_seq, 2166 mfc) < 0) 2167 goto done; 2168 next_entry: 2169 e++; 2170 } 2171 e = s_e = 0; 2172 } 2173 s_h = 0; 2174 next_table: 2175 t++; 2176 } 2177 done: 2178 rcu_read_unlock(); 2179 2180 cb->args[2] = e; 2181 cb->args[1] = h; 2182 cb->args[0] = t; 2183 2184 return skb->len; 2185 } 2186 2187 #ifdef CONFIG_PROC_FS 2188 /* 2189 * The /proc interfaces to multicast routing : 2190 * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif 2191 */ 2192 struct ipmr_vif_iter { 2193 struct seq_net_private p; 2194 struct mr_table *mrt; 2195 int ct; 2196 }; 2197 2198 static struct vif_device *ipmr_vif_seq_idx(struct net *net, 2199 struct ipmr_vif_iter *iter, 2200 loff_t pos) 2201 { 2202 struct mr_table *mrt = iter->mrt; 2203 2204 for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { 2205 if (!VIF_EXISTS(mrt, iter->ct)) 2206 continue; 2207 if (pos-- == 0) 2208 return &mrt->vif_table[iter->ct]; 2209 } 2210 return NULL; 2211 } 2212 2213 static void *ipmr_vif_seq_start(struct seq_file *seq, loff_t *pos) 2214 __acquires(mrt_lock) 2215 { 2216 struct ipmr_vif_iter *iter = seq->private; 2217 struct net *net = seq_file_net(seq); 2218 struct mr_table *mrt; 2219 2220 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); 2221 if (mrt == NULL) 2222 return ERR_PTR(-ENOENT); 2223 2224 iter->mrt = mrt; 2225 2226 read_lock(&mrt_lock); 2227 return *pos ? ipmr_vif_seq_idx(net, seq->private, *pos - 1) 2228 : SEQ_START_TOKEN; 2229 } 2230 2231 static void *ipmr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2232 { 2233 struct ipmr_vif_iter *iter = seq->private; 2234 struct net *net = seq_file_net(seq); 2235 struct mr_table *mrt = iter->mrt; 2236 2237 ++*pos; 2238 if (v == SEQ_START_TOKEN) 2239 return ipmr_vif_seq_idx(net, iter, 0); 2240 2241 while (++iter->ct < mrt->maxvif) { 2242 if (!VIF_EXISTS(mrt, iter->ct)) 2243 continue; 2244 return &mrt->vif_table[iter->ct]; 2245 } 2246 return NULL; 2247 } 2248 2249 static void ipmr_vif_seq_stop(struct seq_file *seq, void *v) 2250 __releases(mrt_lock) 2251 { 2252 read_unlock(&mrt_lock); 2253 } 2254 2255 static int ipmr_vif_seq_show(struct seq_file *seq, void *v) 2256 { 2257 struct ipmr_vif_iter *iter = seq->private; 2258 struct mr_table *mrt = iter->mrt; 2259 2260 if (v == SEQ_START_TOKEN) { 2261 seq_puts(seq, 2262 "Interface BytesIn PktsIn BytesOut PktsOut Flags Local Remote\n"); 2263 } else { 2264 const struct vif_device *vif = v; 2265 const char *name = vif->dev ? vif->dev->name : "none"; 2266 2267 seq_printf(seq, 2268 "%2Zd %-10s %8ld %7ld %8ld %7ld %05X %08X %08X\n", 2269 vif - mrt->vif_table, 2270 name, vif->bytes_in, vif->pkt_in, 2271 vif->bytes_out, vif->pkt_out, 2272 vif->flags, vif->local, vif->remote); 2273 } 2274 return 0; 2275 } 2276 2277 static const struct seq_operations ipmr_vif_seq_ops = { 2278 .start = ipmr_vif_seq_start, 2279 .next = ipmr_vif_seq_next, 2280 .stop = ipmr_vif_seq_stop, 2281 .show = ipmr_vif_seq_show, 2282 }; 2283 2284 static int ipmr_vif_open(struct inode *inode, struct file *file) 2285 { 2286 return seq_open_net(inode, file, &ipmr_vif_seq_ops, 2287 sizeof(struct ipmr_vif_iter)); 2288 } 2289 2290 static const struct file_operations ipmr_vif_fops = { 2291 .owner = THIS_MODULE, 2292 .open = ipmr_vif_open, 2293 .read = seq_read, 2294 .llseek = seq_lseek, 2295 .release = seq_release_net, 2296 }; 2297 2298 struct ipmr_mfc_iter { 2299 struct seq_net_private p; 2300 struct mr_table *mrt; 2301 struct list_head *cache; 2302 int ct; 2303 }; 2304 2305 2306 static struct mfc_cache *ipmr_mfc_seq_idx(struct net *net, 2307 struct ipmr_mfc_iter *it, loff_t pos) 2308 { 2309 struct mr_table *mrt = it->mrt; 2310 struct mfc_cache *mfc; 2311 2312 rcu_read_lock(); 2313 for (it->ct = 0; it->ct < MFC_LINES; it->ct++) { 2314 it->cache = &mrt->mfc_cache_array[it->ct]; 2315 list_for_each_entry_rcu(mfc, it->cache, list) 2316 if (pos-- == 0) 2317 return mfc; 2318 } 2319 rcu_read_unlock(); 2320 2321 spin_lock_bh(&mfc_unres_lock); 2322 it->cache = &mrt->mfc_unres_queue; 2323 list_for_each_entry(mfc, it->cache, list) 2324 if (pos-- == 0) 2325 return mfc; 2326 spin_unlock_bh(&mfc_unres_lock); 2327 2328 it->cache = NULL; 2329 return NULL; 2330 } 2331 2332 2333 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) 2334 { 2335 struct ipmr_mfc_iter *it = seq->private; 2336 struct net *net = seq_file_net(seq); 2337 struct mr_table *mrt; 2338 2339 mrt = ipmr_get_table(net, RT_TABLE_DEFAULT); 2340 if (mrt == NULL) 2341 return ERR_PTR(-ENOENT); 2342 2343 it->mrt = mrt; 2344 it->cache = NULL; 2345 it->ct = 0; 2346 return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1) 2347 : SEQ_START_TOKEN; 2348 } 2349 2350 static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2351 { 2352 struct mfc_cache *mfc = v; 2353 struct ipmr_mfc_iter *it = seq->private; 2354 struct net *net = seq_file_net(seq); 2355 struct mr_table *mrt = it->mrt; 2356 2357 ++*pos; 2358 2359 if (v == SEQ_START_TOKEN) 2360 return ipmr_mfc_seq_idx(net, seq->private, 0); 2361 2362 if (mfc->list.next != it->cache) 2363 return list_entry(mfc->list.next, struct mfc_cache, list); 2364 2365 if (it->cache == &mrt->mfc_unres_queue) 2366 goto end_of_list; 2367 2368 BUG_ON(it->cache != &mrt->mfc_cache_array[it->ct]); 2369 2370 while (++it->ct < MFC_LINES) { 2371 it->cache = &mrt->mfc_cache_array[it->ct]; 2372 if (list_empty(it->cache)) 2373 continue; 2374 return list_first_entry(it->cache, struct mfc_cache, list); 2375 } 2376 2377 /* exhausted cache_array, show unresolved */ 2378 rcu_read_unlock(); 2379 it->cache = &mrt->mfc_unres_queue; 2380 it->ct = 0; 2381 2382 spin_lock_bh(&mfc_unres_lock); 2383 if (!list_empty(it->cache)) 2384 return list_first_entry(it->cache, struct mfc_cache, list); 2385 2386 end_of_list: 2387 spin_unlock_bh(&mfc_unres_lock); 2388 it->cache = NULL; 2389 2390 return NULL; 2391 } 2392 2393 static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v) 2394 { 2395 struct ipmr_mfc_iter *it = seq->private; 2396 struct mr_table *mrt = it->mrt; 2397 2398 if (it->cache == &mrt->mfc_unres_queue) 2399 spin_unlock_bh(&mfc_unres_lock); 2400 else if (it->cache == &mrt->mfc_cache_array[it->ct]) 2401 rcu_read_unlock(); 2402 } 2403 2404 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) 2405 { 2406 int n; 2407 2408 if (v == SEQ_START_TOKEN) { 2409 seq_puts(seq, 2410 "Group Origin Iif Pkts Bytes Wrong Oifs\n"); 2411 } else { 2412 const struct mfc_cache *mfc = v; 2413 const struct ipmr_mfc_iter *it = seq->private; 2414 const struct mr_table *mrt = it->mrt; 2415 2416 seq_printf(seq, "%08X %08X %-3hd", 2417 (__force u32) mfc->mfc_mcastgrp, 2418 (__force u32) mfc->mfc_origin, 2419 mfc->mfc_parent); 2420 2421 if (it->cache != &mrt->mfc_unres_queue) { 2422 seq_printf(seq, " %8lu %8lu %8lu", 2423 mfc->mfc_un.res.pkt, 2424 mfc->mfc_un.res.bytes, 2425 mfc->mfc_un.res.wrong_if); 2426 for (n = mfc->mfc_un.res.minvif; 2427 n < mfc->mfc_un.res.maxvif; n++) { 2428 if (VIF_EXISTS(mrt, n) && 2429 mfc->mfc_un.res.ttls[n] < 255) 2430 seq_printf(seq, 2431 " %2d:%-3d", 2432 n, mfc->mfc_un.res.ttls[n]); 2433 } 2434 } else { 2435 /* unresolved mfc_caches don't contain 2436 * pkt, bytes and wrong_if values 2437 */ 2438 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); 2439 } 2440 seq_putc(seq, '\n'); 2441 } 2442 return 0; 2443 } 2444 2445 static const struct seq_operations ipmr_mfc_seq_ops = { 2446 .start = ipmr_mfc_seq_start, 2447 .next = ipmr_mfc_seq_next, 2448 .stop = ipmr_mfc_seq_stop, 2449 .show = ipmr_mfc_seq_show, 2450 }; 2451 2452 static int ipmr_mfc_open(struct inode *inode, struct file *file) 2453 { 2454 return seq_open_net(inode, file, &ipmr_mfc_seq_ops, 2455 sizeof(struct ipmr_mfc_iter)); 2456 } 2457 2458 static const struct file_operations ipmr_mfc_fops = { 2459 .owner = THIS_MODULE, 2460 .open = ipmr_mfc_open, 2461 .read = seq_read, 2462 .llseek = seq_lseek, 2463 .release = seq_release_net, 2464 }; 2465 #endif 2466 2467 #ifdef CONFIG_IP_PIMSM_V2 2468 static const struct net_protocol pim_protocol = { 2469 .handler = pim_rcv, 2470 .netns_ok = 1, 2471 }; 2472 #endif 2473 2474 2475 /* 2476 * Setup for IP multicast routing 2477 */ 2478 static int __net_init ipmr_net_init(struct net *net) 2479 { 2480 int err; 2481 2482 err = ipmr_rules_init(net); 2483 if (err < 0) 2484 goto fail; 2485 2486 #ifdef CONFIG_PROC_FS 2487 err = -ENOMEM; 2488 if (!proc_net_fops_create(net, "ip_mr_vif", 0, &ipmr_vif_fops)) 2489 goto proc_vif_fail; 2490 if (!proc_net_fops_create(net, "ip_mr_cache", 0, &ipmr_mfc_fops)) 2491 goto proc_cache_fail; 2492 #endif 2493 return 0; 2494 2495 #ifdef CONFIG_PROC_FS 2496 proc_cache_fail: 2497 proc_net_remove(net, "ip_mr_vif"); 2498 proc_vif_fail: 2499 ipmr_rules_exit(net); 2500 #endif 2501 fail: 2502 return err; 2503 } 2504 2505 static void __net_exit ipmr_net_exit(struct net *net) 2506 { 2507 #ifdef CONFIG_PROC_FS 2508 proc_net_remove(net, "ip_mr_cache"); 2509 proc_net_remove(net, "ip_mr_vif"); 2510 #endif 2511 ipmr_rules_exit(net); 2512 } 2513 2514 static struct pernet_operations ipmr_net_ops = { 2515 .init = ipmr_net_init, 2516 .exit = ipmr_net_exit, 2517 }; 2518 2519 int __init ip_mr_init(void) 2520 { 2521 int err; 2522 2523 mrt_cachep = kmem_cache_create("ip_mrt_cache", 2524 sizeof(struct mfc_cache), 2525 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, 2526 NULL); 2527 if (!mrt_cachep) 2528 return -ENOMEM; 2529 2530 err = register_pernet_subsys(&ipmr_net_ops); 2531 if (err) 2532 goto reg_pernet_fail; 2533 2534 err = register_netdevice_notifier(&ip_mr_notifier); 2535 if (err) 2536 goto reg_notif_fail; 2537 #ifdef CONFIG_IP_PIMSM_V2 2538 if (inet_add_protocol(&pim_protocol, IPPROTO_PIM) < 0) { 2539 printk(KERN_ERR "ip_mr_init: can't add PIM protocol\n"); 2540 err = -EAGAIN; 2541 goto add_proto_fail; 2542 } 2543 #endif 2544 rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, NULL, ipmr_rtm_dumproute); 2545 return 0; 2546 2547 #ifdef CONFIG_IP_PIMSM_V2 2548 add_proto_fail: 2549 unregister_netdevice_notifier(&ip_mr_notifier); 2550 #endif 2551 reg_notif_fail: 2552 unregister_pernet_subsys(&ipmr_net_ops); 2553 reg_pernet_fail: 2554 kmem_cache_destroy(mrt_cachep); 2555 return err; 2556 } 2557