1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Linux IPv6 multicast routing support for BSD pim6sd 4 * Based on net/ipv4/ipmr.c. 5 * 6 * (c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr> 7 * LSIIT Laboratory, Strasbourg, France 8 * (c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com> 9 * 6WIND, Paris, France 10 * Copyright (C)2007,2008 USAGI/WIDE Project 11 * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> 12 */ 13 14 #include <linux/uaccess.h> 15 #include <linux/types.h> 16 #include <linux/sched.h> 17 #include <linux/errno.h> 18 #include <linux/mm.h> 19 #include <linux/kernel.h> 20 #include <linux/fcntl.h> 21 #include <linux/stat.h> 22 #include <linux/socket.h> 23 #include <linux/inet.h> 24 #include <linux/netdevice.h> 25 #include <linux/inetdevice.h> 26 #include <linux/proc_fs.h> 27 #include <linux/seq_file.h> 28 #include <linux/init.h> 29 #include <linux/compat.h> 30 #include <linux/rhashtable.h> 31 #include <net/protocol.h> 32 #include <linux/skbuff.h> 33 #include <net/raw.h> 34 #include <linux/notifier.h> 35 #include <linux/if_arp.h> 36 #include <net/checksum.h> 37 #include <net/netlink.h> 38 #include <net/fib_rules.h> 39 40 #include <net/ipv6.h> 41 #include <net/ip6_route.h> 42 #include <linux/mroute6.h> 43 #include <linux/pim.h> 44 #include <net/addrconf.h> 45 #include <linux/netfilter_ipv6.h> 46 #include <linux/export.h> 47 #include <net/ip6_checksum.h> 48 #include <linux/netconf.h> 49 #include <net/ip_tunnels.h> 50 51 #include <linux/nospec.h> 52 53 struct ip6mr_rule { 54 struct fib_rule common; 55 }; 56 57 struct ip6mr_result { 58 struct mr_table *mrt; 59 }; 60 61 /* Big lock, protecting vif table, mrt cache and mroute socket state. 62 Note that the changes are semaphored via rtnl_lock. 63 */ 64 65 static DEFINE_SPINLOCK(mrt_lock); 66 67 static struct net_device *vif_dev_read(const struct vif_device *vif) 68 { 69 return rcu_dereference(vif->dev); 70 } 71 72 /* Multicast router control variables */ 73 74 /* Special spinlock for queue of unresolved entries */ 75 static DEFINE_SPINLOCK(mfc_unres_lock); 76 77 /* We return to original Alan's scheme. Hash table of resolved 78 entries is changed only in process context and protected 79 with weak lock mrt_lock. Queue of unresolved entries is protected 80 with strong spinlock mfc_unres_lock. 81 82 In this case data path is free of exclusive locks at all. 83 */ 84 85 static struct kmem_cache *mrt_cachep __read_mostly; 86 87 static struct mr_table *ip6mr_new_table(struct net *net, u32 id); 88 static void ip6mr_free_table(struct mr_table *mrt); 89 90 static void ip6_mr_forward(struct net *net, struct mr_table *mrt, 91 struct net_device *dev, struct sk_buff *skb, 92 struct mfc6_cache *cache); 93 static int ip6mr_cache_report(const struct mr_table *mrt, struct sk_buff *pkt, 94 mifi_t mifi, int assert); 95 static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc, 96 int cmd); 97 static void mrt6msg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt); 98 static int ip6mr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, 99 struct netlink_ext_ack *extack); 100 static int ip6mr_rtm_dumproute(struct sk_buff *skb, 101 struct netlink_callback *cb); 102 static void mroute_clean_tables(struct mr_table *mrt, int flags); 103 static void ipmr_expire_process(struct timer_list *t); 104 105 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES 106 #define ip6mr_for_each_table(mrt, net) \ 107 list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list, \ 108 lockdep_rtnl_is_held() || \ 109 list_empty(&net->ipv6.mr6_tables)) 110 111 static struct mr_table *ip6mr_mr_table_iter(struct net *net, 112 struct mr_table *mrt) 113 { 114 struct mr_table *ret; 115 116 if (!mrt) 117 ret = list_entry_rcu(net->ipv6.mr6_tables.next, 118 struct mr_table, list); 119 else 120 ret = list_entry_rcu(mrt->list.next, 121 struct mr_table, list); 122 123 if (&ret->list == &net->ipv6.mr6_tables) 124 return NULL; 125 return ret; 126 } 127 128 static struct mr_table *ip6mr_get_table(struct net *net, u32 id) 129 { 130 struct mr_table *mrt; 131 132 ip6mr_for_each_table(mrt, net) { 133 if (mrt->id == id) 134 return mrt; 135 } 136 return NULL; 137 } 138 139 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6, 140 struct mr_table **mrt) 141 { 142 int err; 143 struct ip6mr_result res; 144 struct fib_lookup_arg arg = { 145 .result = &res, 146 .flags = FIB_LOOKUP_NOREF, 147 }; 148 149 /* update flow if oif or iif point to device enslaved to l3mdev */ 150 l3mdev_update_flow(net, flowi6_to_flowi(flp6)); 151 152 err = fib_rules_lookup(net->ipv6.mr6_rules_ops, 153 flowi6_to_flowi(flp6), 0, &arg); 154 if (err < 0) 155 return err; 156 *mrt = res.mrt; 157 return 0; 158 } 159 160 static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp, 161 int flags, struct fib_lookup_arg *arg) 162 { 163 struct ip6mr_result *res = arg->result; 164 struct mr_table *mrt; 165 166 switch (rule->action) { 167 case FR_ACT_TO_TBL: 168 break; 169 case FR_ACT_UNREACHABLE: 170 return -ENETUNREACH; 171 case FR_ACT_PROHIBIT: 172 return -EACCES; 173 case FR_ACT_BLACKHOLE: 174 default: 175 return -EINVAL; 176 } 177 178 arg->table = fib_rule_get_table(rule, arg); 179 180 mrt = ip6mr_get_table(rule->fr_net, arg->table); 181 if (!mrt) 182 return -EAGAIN; 183 res->mrt = mrt; 184 return 0; 185 } 186 187 static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags) 188 { 189 return 1; 190 } 191 192 static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb, 193 struct fib_rule_hdr *frh, struct nlattr **tb, 194 struct netlink_ext_ack *extack) 195 { 196 return 0; 197 } 198 199 static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, 200 struct nlattr **tb) 201 { 202 return 1; 203 } 204 205 static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb, 206 struct fib_rule_hdr *frh) 207 { 208 frh->dst_len = 0; 209 frh->src_len = 0; 210 frh->tos = 0; 211 return 0; 212 } 213 214 static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = { 215 .family = RTNL_FAMILY_IP6MR, 216 .rule_size = sizeof(struct ip6mr_rule), 217 .addr_size = sizeof(struct in6_addr), 218 .action = ip6mr_rule_action, 219 .match = ip6mr_rule_match, 220 .configure = ip6mr_rule_configure, 221 .compare = ip6mr_rule_compare, 222 .fill = ip6mr_rule_fill, 223 .nlgroup = RTNLGRP_IPV6_RULE, 224 .owner = THIS_MODULE, 225 }; 226 227 static int __net_init ip6mr_rules_init(struct net *net) 228 { 229 struct fib_rules_ops *ops; 230 struct mr_table *mrt; 231 int err; 232 233 ops = fib_rules_register(&ip6mr_rules_ops_template, net); 234 if (IS_ERR(ops)) 235 return PTR_ERR(ops); 236 237 INIT_LIST_HEAD(&net->ipv6.mr6_tables); 238 239 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT); 240 if (IS_ERR(mrt)) { 241 err = PTR_ERR(mrt); 242 goto err1; 243 } 244 245 err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0); 246 if (err < 0) 247 goto err2; 248 249 net->ipv6.mr6_rules_ops = ops; 250 return 0; 251 252 err2: 253 rtnl_lock(); 254 ip6mr_free_table(mrt); 255 rtnl_unlock(); 256 err1: 257 fib_rules_unregister(ops); 258 return err; 259 } 260 261 static void __net_exit ip6mr_rules_exit(struct net *net) 262 { 263 struct mr_table *mrt, *next; 264 265 ASSERT_RTNL(); 266 list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) { 267 list_del(&mrt->list); 268 ip6mr_free_table(mrt); 269 } 270 fib_rules_unregister(net->ipv6.mr6_rules_ops); 271 } 272 273 static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb, 274 struct netlink_ext_ack *extack) 275 { 276 return fib_rules_dump(net, nb, RTNL_FAMILY_IP6MR, extack); 277 } 278 279 static unsigned int ip6mr_rules_seq_read(struct net *net) 280 { 281 return fib_rules_seq_read(net, RTNL_FAMILY_IP6MR); 282 } 283 284 bool ip6mr_rule_default(const struct fib_rule *rule) 285 { 286 return fib_rule_matchall(rule) && rule->action == FR_ACT_TO_TBL && 287 rule->table == RT6_TABLE_DFLT && !rule->l3mdev; 288 } 289 EXPORT_SYMBOL(ip6mr_rule_default); 290 #else 291 #define ip6mr_for_each_table(mrt, net) \ 292 for (mrt = net->ipv6.mrt6; mrt; mrt = NULL) 293 294 static struct mr_table *ip6mr_mr_table_iter(struct net *net, 295 struct mr_table *mrt) 296 { 297 if (!mrt) 298 return net->ipv6.mrt6; 299 return NULL; 300 } 301 302 static struct mr_table *ip6mr_get_table(struct net *net, u32 id) 303 { 304 return net->ipv6.mrt6; 305 } 306 307 static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6, 308 struct mr_table **mrt) 309 { 310 *mrt = net->ipv6.mrt6; 311 return 0; 312 } 313 314 static int __net_init ip6mr_rules_init(struct net *net) 315 { 316 struct mr_table *mrt; 317 318 mrt = ip6mr_new_table(net, RT6_TABLE_DFLT); 319 if (IS_ERR(mrt)) 320 return PTR_ERR(mrt); 321 net->ipv6.mrt6 = mrt; 322 return 0; 323 } 324 325 static void __net_exit ip6mr_rules_exit(struct net *net) 326 { 327 ASSERT_RTNL(); 328 ip6mr_free_table(net->ipv6.mrt6); 329 net->ipv6.mrt6 = NULL; 330 } 331 332 static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb, 333 struct netlink_ext_ack *extack) 334 { 335 return 0; 336 } 337 338 static unsigned int ip6mr_rules_seq_read(struct net *net) 339 { 340 return 0; 341 } 342 #endif 343 344 static int ip6mr_hash_cmp(struct rhashtable_compare_arg *arg, 345 const void *ptr) 346 { 347 const struct mfc6_cache_cmp_arg *cmparg = arg->key; 348 struct mfc6_cache *c = (struct mfc6_cache *)ptr; 349 350 return !ipv6_addr_equal(&c->mf6c_mcastgrp, &cmparg->mf6c_mcastgrp) || 351 !ipv6_addr_equal(&c->mf6c_origin, &cmparg->mf6c_origin); 352 } 353 354 static const struct rhashtable_params ip6mr_rht_params = { 355 .head_offset = offsetof(struct mr_mfc, mnode), 356 .key_offset = offsetof(struct mfc6_cache, cmparg), 357 .key_len = sizeof(struct mfc6_cache_cmp_arg), 358 .nelem_hint = 3, 359 .obj_cmpfn = ip6mr_hash_cmp, 360 .automatic_shrinking = true, 361 }; 362 363 static void ip6mr_new_table_set(struct mr_table *mrt, 364 struct net *net) 365 { 366 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES 367 list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables); 368 #endif 369 } 370 371 static struct mfc6_cache_cmp_arg ip6mr_mr_table_ops_cmparg_any = { 372 .mf6c_origin = IN6ADDR_ANY_INIT, 373 .mf6c_mcastgrp = IN6ADDR_ANY_INIT, 374 }; 375 376 static struct mr_table_ops ip6mr_mr_table_ops = { 377 .rht_params = &ip6mr_rht_params, 378 .cmparg_any = &ip6mr_mr_table_ops_cmparg_any, 379 }; 380 381 static struct mr_table *ip6mr_new_table(struct net *net, u32 id) 382 { 383 struct mr_table *mrt; 384 385 mrt = ip6mr_get_table(net, id); 386 if (mrt) 387 return mrt; 388 389 return mr_table_alloc(net, id, &ip6mr_mr_table_ops, 390 ipmr_expire_process, ip6mr_new_table_set); 391 } 392 393 static void ip6mr_free_table(struct mr_table *mrt) 394 { 395 timer_shutdown_sync(&mrt->ipmr_expire_timer); 396 mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC | 397 MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC); 398 rhltable_destroy(&mrt->mfc_hash); 399 kfree(mrt); 400 } 401 402 #ifdef CONFIG_PROC_FS 403 /* The /proc interfaces to multicast routing 404 * /proc/ip6_mr_cache /proc/ip6_mr_vif 405 */ 406 407 static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos) 408 __acquires(RCU) 409 { 410 struct mr_vif_iter *iter = seq->private; 411 struct net *net = seq_file_net(seq); 412 struct mr_table *mrt; 413 414 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); 415 if (!mrt) 416 return ERR_PTR(-ENOENT); 417 418 iter->mrt = mrt; 419 420 rcu_read_lock(); 421 return mr_vif_seq_start(seq, pos); 422 } 423 424 static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v) 425 __releases(RCU) 426 { 427 rcu_read_unlock(); 428 } 429 430 static int ip6mr_vif_seq_show(struct seq_file *seq, void *v) 431 { 432 struct mr_vif_iter *iter = seq->private; 433 struct mr_table *mrt = iter->mrt; 434 435 if (v == SEQ_START_TOKEN) { 436 seq_puts(seq, 437 "Interface BytesIn PktsIn BytesOut PktsOut Flags\n"); 438 } else { 439 const struct vif_device *vif = v; 440 const struct net_device *vif_dev; 441 const char *name; 442 443 vif_dev = vif_dev_read(vif); 444 name = vif_dev ? vif_dev->name : "none"; 445 446 seq_printf(seq, 447 "%2td %-10s %8ld %7ld %8ld %7ld %05X\n", 448 vif - mrt->vif_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 = mr_vif_seq_next, 459 .stop = ip6mr_vif_seq_stop, 460 .show = ip6mr_vif_seq_show, 461 }; 462 463 static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos) 464 { 465 struct net *net = seq_file_net(seq); 466 struct mr_table *mrt; 467 468 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); 469 if (!mrt) 470 return ERR_PTR(-ENOENT); 471 472 return mr_mfc_seq_start(seq, pos, mrt, &mfc_unres_lock); 473 } 474 475 static int ipmr_mfc_seq_show(struct seq_file *seq, void *v) 476 { 477 int n; 478 479 if (v == SEQ_START_TOKEN) { 480 seq_puts(seq, 481 "Group " 482 "Origin " 483 "Iif Pkts Bytes Wrong Oifs\n"); 484 } else { 485 const struct mfc6_cache *mfc = v; 486 const struct mr_mfc_iter *it = seq->private; 487 struct mr_table *mrt = it->mrt; 488 489 seq_printf(seq, "%pI6 %pI6 %-3hd", 490 &mfc->mf6c_mcastgrp, &mfc->mf6c_origin, 491 mfc->_c.mfc_parent); 492 493 if (it->cache != &mrt->mfc_unres_queue) { 494 seq_printf(seq, " %8lu %8lu %8lu", 495 mfc->_c.mfc_un.res.pkt, 496 mfc->_c.mfc_un.res.bytes, 497 mfc->_c.mfc_un.res.wrong_if); 498 for (n = mfc->_c.mfc_un.res.minvif; 499 n < mfc->_c.mfc_un.res.maxvif; n++) { 500 if (VIF_EXISTS(mrt, n) && 501 mfc->_c.mfc_un.res.ttls[n] < 255) 502 seq_printf(seq, 503 " %2d:%-3d", n, 504 mfc->_c.mfc_un.res.ttls[n]); 505 } 506 } else { 507 /* unresolved mfc_caches don't contain 508 * pkt, bytes and wrong_if values 509 */ 510 seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul); 511 } 512 seq_putc(seq, '\n'); 513 } 514 return 0; 515 } 516 517 static const struct seq_operations ipmr_mfc_seq_ops = { 518 .start = ipmr_mfc_seq_start, 519 .next = mr_mfc_seq_next, 520 .stop = mr_mfc_seq_stop, 521 .show = ipmr_mfc_seq_show, 522 }; 523 #endif 524 525 #ifdef CONFIG_IPV6_PIMSM_V2 526 527 static int pim6_rcv(struct sk_buff *skb) 528 { 529 struct pimreghdr *pim; 530 struct ipv6hdr *encap; 531 struct net_device *reg_dev = NULL; 532 struct net *net = dev_net(skb->dev); 533 struct mr_table *mrt; 534 struct flowi6 fl6 = { 535 .flowi6_iif = skb->dev->ifindex, 536 .flowi6_mark = skb->mark, 537 }; 538 int reg_vif_num; 539 540 if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap))) 541 goto drop; 542 543 pim = (struct pimreghdr *)skb_transport_header(skb); 544 if (pim->type != ((PIM_VERSION << 4) | PIM_TYPE_REGISTER) || 545 (pim->flags & PIM_NULL_REGISTER) || 546 (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, 547 sizeof(*pim), IPPROTO_PIM, 548 csum_partial((void *)pim, sizeof(*pim), 0)) && 549 csum_fold(skb_checksum(skb, 0, skb->len, 0)))) 550 goto drop; 551 552 /* check if the inner packet is destined to mcast group */ 553 encap = (struct ipv6hdr *)(skb_transport_header(skb) + 554 sizeof(*pim)); 555 556 if (!ipv6_addr_is_multicast(&encap->daddr) || 557 encap->payload_len == 0 || 558 ntohs(encap->payload_len) + sizeof(*pim) > skb->len) 559 goto drop; 560 561 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) 562 goto drop; 563 564 /* Pairs with WRITE_ONCE() in mif6_add()/mif6_delete() */ 565 reg_vif_num = READ_ONCE(mrt->mroute_reg_vif_num); 566 if (reg_vif_num >= 0) 567 reg_dev = vif_dev_read(&mrt->vif_table[reg_vif_num]); 568 569 if (!reg_dev) 570 goto drop; 571 572 skb->mac_header = skb->network_header; 573 skb_pull(skb, (u8 *)encap - skb->data); 574 skb_reset_network_header(skb); 575 skb->protocol = htons(ETH_P_IPV6); 576 skb->ip_summed = CHECKSUM_NONE; 577 578 skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev)); 579 580 netif_rx(skb); 581 582 return 0; 583 drop: 584 kfree_skb(skb); 585 return 0; 586 } 587 588 static const struct inet6_protocol pim6_protocol = { 589 .handler = pim6_rcv, 590 }; 591 592 /* Service routines creating virtual interfaces: PIMREG */ 593 594 static netdev_tx_t reg_vif_xmit(struct sk_buff *skb, 595 struct net_device *dev) 596 { 597 struct net *net = dev_net(dev); 598 struct mr_table *mrt; 599 struct flowi6 fl6 = { 600 .flowi6_oif = dev->ifindex, 601 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, 602 .flowi6_mark = skb->mark, 603 }; 604 605 if (!pskb_inet_may_pull(skb)) 606 goto tx_err; 607 608 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) 609 goto tx_err; 610 611 DEV_STATS_ADD(dev, tx_bytes, skb->len); 612 DEV_STATS_INC(dev, tx_packets); 613 rcu_read_lock(); 614 ip6mr_cache_report(mrt, skb, READ_ONCE(mrt->mroute_reg_vif_num), 615 MRT6MSG_WHOLEPKT); 616 rcu_read_unlock(); 617 kfree_skb(skb); 618 return NETDEV_TX_OK; 619 620 tx_err: 621 DEV_STATS_INC(dev, tx_errors); 622 kfree_skb(skb); 623 return NETDEV_TX_OK; 624 } 625 626 static int reg_vif_get_iflink(const struct net_device *dev) 627 { 628 return 0; 629 } 630 631 static const struct net_device_ops reg_vif_netdev_ops = { 632 .ndo_start_xmit = reg_vif_xmit, 633 .ndo_get_iflink = reg_vif_get_iflink, 634 }; 635 636 static void reg_vif_setup(struct net_device *dev) 637 { 638 dev->type = ARPHRD_PIMREG; 639 dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8; 640 dev->flags = IFF_NOARP; 641 dev->netdev_ops = ®_vif_netdev_ops; 642 dev->needs_free_netdev = true; 643 dev->features |= NETIF_F_NETNS_LOCAL; 644 } 645 646 static struct net_device *ip6mr_reg_vif(struct net *net, struct mr_table *mrt) 647 { 648 struct net_device *dev; 649 char name[IFNAMSIZ]; 650 651 if (mrt->id == RT6_TABLE_DFLT) 652 sprintf(name, "pim6reg"); 653 else 654 sprintf(name, "pim6reg%u", mrt->id); 655 656 dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup); 657 if (!dev) 658 return NULL; 659 660 dev_net_set(dev, net); 661 662 if (register_netdevice(dev)) { 663 free_netdev(dev); 664 return NULL; 665 } 666 667 if (dev_open(dev, NULL)) 668 goto failure; 669 670 dev_hold(dev); 671 return dev; 672 673 failure: 674 unregister_netdevice(dev); 675 return NULL; 676 } 677 #endif 678 679 static int call_ip6mr_vif_entry_notifiers(struct net *net, 680 enum fib_event_type event_type, 681 struct vif_device *vif, 682 struct net_device *vif_dev, 683 mifi_t vif_index, u32 tb_id) 684 { 685 return mr_call_vif_notifiers(net, RTNL_FAMILY_IP6MR, event_type, 686 vif, vif_dev, vif_index, tb_id, 687 &net->ipv6.ipmr_seq); 688 } 689 690 static int call_ip6mr_mfc_entry_notifiers(struct net *net, 691 enum fib_event_type event_type, 692 struct mfc6_cache *mfc, u32 tb_id) 693 { 694 return mr_call_mfc_notifiers(net, RTNL_FAMILY_IP6MR, event_type, 695 &mfc->_c, tb_id, &net->ipv6.ipmr_seq); 696 } 697 698 /* Delete a VIF entry */ 699 static int mif6_delete(struct mr_table *mrt, int vifi, int notify, 700 struct list_head *head) 701 { 702 struct vif_device *v; 703 struct net_device *dev; 704 struct inet6_dev *in6_dev; 705 706 if (vifi < 0 || vifi >= mrt->maxvif) 707 return -EADDRNOTAVAIL; 708 709 v = &mrt->vif_table[vifi]; 710 711 dev = rtnl_dereference(v->dev); 712 if (!dev) 713 return -EADDRNOTAVAIL; 714 715 call_ip6mr_vif_entry_notifiers(read_pnet(&mrt->net), 716 FIB_EVENT_VIF_DEL, v, dev, 717 vifi, mrt->id); 718 spin_lock(&mrt_lock); 719 RCU_INIT_POINTER(v->dev, NULL); 720 721 #ifdef CONFIG_IPV6_PIMSM_V2 722 if (vifi == mrt->mroute_reg_vif_num) { 723 /* Pairs with READ_ONCE() in ip6mr_cache_report() and reg_vif_xmit() */ 724 WRITE_ONCE(mrt->mroute_reg_vif_num, -1); 725 } 726 #endif 727 728 if (vifi + 1 == mrt->maxvif) { 729 int tmp; 730 for (tmp = vifi - 1; tmp >= 0; tmp--) { 731 if (VIF_EXISTS(mrt, tmp)) 732 break; 733 } 734 WRITE_ONCE(mrt->maxvif, tmp + 1); 735 } 736 737 spin_unlock(&mrt_lock); 738 739 dev_set_allmulti(dev, -1); 740 741 in6_dev = __in6_dev_get(dev); 742 if (in6_dev) { 743 atomic_dec(&in6_dev->cnf.mc_forwarding); 744 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 745 NETCONFA_MC_FORWARDING, 746 dev->ifindex, &in6_dev->cnf); 747 } 748 749 if ((v->flags & MIFF_REGISTER) && !notify) 750 unregister_netdevice_queue(dev, head); 751 752 netdev_put(dev, &v->dev_tracker); 753 return 0; 754 } 755 756 static inline void ip6mr_cache_free_rcu(struct rcu_head *head) 757 { 758 struct mr_mfc *c = container_of(head, struct mr_mfc, rcu); 759 760 kmem_cache_free(mrt_cachep, (struct mfc6_cache *)c); 761 } 762 763 static inline void ip6mr_cache_free(struct mfc6_cache *c) 764 { 765 call_rcu(&c->_c.rcu, ip6mr_cache_free_rcu); 766 } 767 768 /* Destroy an unresolved cache entry, killing queued skbs 769 and reporting error to netlink readers. 770 */ 771 772 static void ip6mr_destroy_unres(struct mr_table *mrt, struct mfc6_cache *c) 773 { 774 struct net *net = read_pnet(&mrt->net); 775 struct sk_buff *skb; 776 777 atomic_dec(&mrt->cache_resolve_queue_len); 778 779 while ((skb = skb_dequeue(&c->_c.mfc_un.unres.unresolved)) != NULL) { 780 if (ipv6_hdr(skb)->version == 0) { 781 struct nlmsghdr *nlh = skb_pull(skb, 782 sizeof(struct ipv6hdr)); 783 nlh->nlmsg_type = NLMSG_ERROR; 784 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); 785 skb_trim(skb, nlh->nlmsg_len); 786 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT; 787 rtnl_unicast(skb, net, NETLINK_CB(skb).portid); 788 } else 789 kfree_skb(skb); 790 } 791 792 ip6mr_cache_free(c); 793 } 794 795 796 /* Timer process for all the unresolved queue. */ 797 798 static void ipmr_do_expire_process(struct mr_table *mrt) 799 { 800 unsigned long now = jiffies; 801 unsigned long expires = 10 * HZ; 802 struct mr_mfc *c, *next; 803 804 list_for_each_entry_safe(c, next, &mrt->mfc_unres_queue, list) { 805 if (time_after(c->mfc_un.unres.expires, now)) { 806 /* not yet... */ 807 unsigned long interval = c->mfc_un.unres.expires - now; 808 if (interval < expires) 809 expires = interval; 810 continue; 811 } 812 813 list_del(&c->list); 814 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE); 815 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c); 816 } 817 818 if (!list_empty(&mrt->mfc_unres_queue)) 819 mod_timer(&mrt->ipmr_expire_timer, jiffies + expires); 820 } 821 822 static void ipmr_expire_process(struct timer_list *t) 823 { 824 struct mr_table *mrt = from_timer(mrt, t, ipmr_expire_timer); 825 826 if (!spin_trylock(&mfc_unres_lock)) { 827 mod_timer(&mrt->ipmr_expire_timer, jiffies + 1); 828 return; 829 } 830 831 if (!list_empty(&mrt->mfc_unres_queue)) 832 ipmr_do_expire_process(mrt); 833 834 spin_unlock(&mfc_unres_lock); 835 } 836 837 /* Fill oifs list. It is called under locked mrt_lock. */ 838 839 static void ip6mr_update_thresholds(struct mr_table *mrt, 840 struct mr_mfc *cache, 841 unsigned char *ttls) 842 { 843 int vifi; 844 845 cache->mfc_un.res.minvif = MAXMIFS; 846 cache->mfc_un.res.maxvif = 0; 847 memset(cache->mfc_un.res.ttls, 255, MAXMIFS); 848 849 for (vifi = 0; vifi < mrt->maxvif; vifi++) { 850 if (VIF_EXISTS(mrt, vifi) && 851 ttls[vifi] && ttls[vifi] < 255) { 852 cache->mfc_un.res.ttls[vifi] = ttls[vifi]; 853 if (cache->mfc_un.res.minvif > vifi) 854 cache->mfc_un.res.minvif = vifi; 855 if (cache->mfc_un.res.maxvif <= vifi) 856 cache->mfc_un.res.maxvif = vifi + 1; 857 } 858 } 859 cache->mfc_un.res.lastuse = jiffies; 860 } 861 862 static int mif6_add(struct net *net, struct mr_table *mrt, 863 struct mif6ctl *vifc, int mrtsock) 864 { 865 int vifi = vifc->mif6c_mifi; 866 struct vif_device *v = &mrt->vif_table[vifi]; 867 struct net_device *dev; 868 struct inet6_dev *in6_dev; 869 int err; 870 871 /* Is vif busy ? */ 872 if (VIF_EXISTS(mrt, vifi)) 873 return -EADDRINUSE; 874 875 switch (vifc->mif6c_flags) { 876 #ifdef CONFIG_IPV6_PIMSM_V2 877 case MIFF_REGISTER: 878 /* 879 * Special Purpose VIF in PIM 880 * All the packets will be sent to the daemon 881 */ 882 if (mrt->mroute_reg_vif_num >= 0) 883 return -EADDRINUSE; 884 dev = ip6mr_reg_vif(net, mrt); 885 if (!dev) 886 return -ENOBUFS; 887 err = dev_set_allmulti(dev, 1); 888 if (err) { 889 unregister_netdevice(dev); 890 dev_put(dev); 891 return err; 892 } 893 break; 894 #endif 895 case 0: 896 dev = dev_get_by_index(net, vifc->mif6c_pifi); 897 if (!dev) 898 return -EADDRNOTAVAIL; 899 err = dev_set_allmulti(dev, 1); 900 if (err) { 901 dev_put(dev); 902 return err; 903 } 904 break; 905 default: 906 return -EINVAL; 907 } 908 909 in6_dev = __in6_dev_get(dev); 910 if (in6_dev) { 911 atomic_inc(&in6_dev->cnf.mc_forwarding); 912 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 913 NETCONFA_MC_FORWARDING, 914 dev->ifindex, &in6_dev->cnf); 915 } 916 917 /* Fill in the VIF structures */ 918 vif_device_init(v, dev, vifc->vifc_rate_limit, vifc->vifc_threshold, 919 vifc->mif6c_flags | (!mrtsock ? VIFF_STATIC : 0), 920 MIFF_REGISTER); 921 922 /* And finish update writing critical data */ 923 spin_lock(&mrt_lock); 924 rcu_assign_pointer(v->dev, dev); 925 netdev_tracker_alloc(dev, &v->dev_tracker, GFP_ATOMIC); 926 #ifdef CONFIG_IPV6_PIMSM_V2 927 if (v->flags & MIFF_REGISTER) 928 WRITE_ONCE(mrt->mroute_reg_vif_num, vifi); 929 #endif 930 if (vifi + 1 > mrt->maxvif) 931 WRITE_ONCE(mrt->maxvif, vifi + 1); 932 spin_unlock(&mrt_lock); 933 call_ip6mr_vif_entry_notifiers(net, FIB_EVENT_VIF_ADD, 934 v, dev, vifi, mrt->id); 935 return 0; 936 } 937 938 static struct mfc6_cache *ip6mr_cache_find(struct mr_table *mrt, 939 const struct in6_addr *origin, 940 const struct in6_addr *mcastgrp) 941 { 942 struct mfc6_cache_cmp_arg arg = { 943 .mf6c_origin = *origin, 944 .mf6c_mcastgrp = *mcastgrp, 945 }; 946 947 return mr_mfc_find(mrt, &arg); 948 } 949 950 /* Look for a (*,G) entry */ 951 static struct mfc6_cache *ip6mr_cache_find_any(struct mr_table *mrt, 952 struct in6_addr *mcastgrp, 953 mifi_t mifi) 954 { 955 struct mfc6_cache_cmp_arg arg = { 956 .mf6c_origin = in6addr_any, 957 .mf6c_mcastgrp = *mcastgrp, 958 }; 959 960 if (ipv6_addr_any(mcastgrp)) 961 return mr_mfc_find_any_parent(mrt, mifi); 962 return mr_mfc_find_any(mrt, mifi, &arg); 963 } 964 965 /* Look for a (S,G,iif) entry if parent != -1 */ 966 static struct mfc6_cache * 967 ip6mr_cache_find_parent(struct mr_table *mrt, 968 const struct in6_addr *origin, 969 const struct in6_addr *mcastgrp, 970 int parent) 971 { 972 struct mfc6_cache_cmp_arg arg = { 973 .mf6c_origin = *origin, 974 .mf6c_mcastgrp = *mcastgrp, 975 }; 976 977 return mr_mfc_find_parent(mrt, &arg, parent); 978 } 979 980 /* Allocate a multicast cache entry */ 981 static struct mfc6_cache *ip6mr_cache_alloc(void) 982 { 983 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL); 984 if (!c) 985 return NULL; 986 c->_c.mfc_un.res.last_assert = jiffies - MFC_ASSERT_THRESH - 1; 987 c->_c.mfc_un.res.minvif = MAXMIFS; 988 c->_c.free = ip6mr_cache_free_rcu; 989 refcount_set(&c->_c.mfc_un.res.refcount, 1); 990 return c; 991 } 992 993 static struct mfc6_cache *ip6mr_cache_alloc_unres(void) 994 { 995 struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC); 996 if (!c) 997 return NULL; 998 skb_queue_head_init(&c->_c.mfc_un.unres.unresolved); 999 c->_c.mfc_un.unres.expires = jiffies + 10 * HZ; 1000 return c; 1001 } 1002 1003 /* 1004 * A cache entry has gone into a resolved state from queued 1005 */ 1006 1007 static void ip6mr_cache_resolve(struct net *net, struct mr_table *mrt, 1008 struct mfc6_cache *uc, struct mfc6_cache *c) 1009 { 1010 struct sk_buff *skb; 1011 1012 /* 1013 * Play the pending entries through our router 1014 */ 1015 1016 while ((skb = __skb_dequeue(&uc->_c.mfc_un.unres.unresolved))) { 1017 if (ipv6_hdr(skb)->version == 0) { 1018 struct nlmsghdr *nlh = skb_pull(skb, 1019 sizeof(struct ipv6hdr)); 1020 1021 if (mr_fill_mroute(mrt, skb, &c->_c, 1022 nlmsg_data(nlh)) > 0) { 1023 nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh; 1024 } else { 1025 nlh->nlmsg_type = NLMSG_ERROR; 1026 nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr)); 1027 skb_trim(skb, nlh->nlmsg_len); 1028 ((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE; 1029 } 1030 rtnl_unicast(skb, net, NETLINK_CB(skb).portid); 1031 } else { 1032 rcu_read_lock(); 1033 ip6_mr_forward(net, mrt, skb->dev, skb, c); 1034 rcu_read_unlock(); 1035 } 1036 } 1037 } 1038 1039 /* 1040 * Bounce a cache query up to pim6sd and netlink. 1041 * 1042 * Called under rcu_read_lock() 1043 */ 1044 1045 static int ip6mr_cache_report(const struct mr_table *mrt, struct sk_buff *pkt, 1046 mifi_t mifi, int assert) 1047 { 1048 struct sock *mroute6_sk; 1049 struct sk_buff *skb; 1050 struct mrt6msg *msg; 1051 int ret; 1052 1053 #ifdef CONFIG_IPV6_PIMSM_V2 1054 if (assert == MRT6MSG_WHOLEPKT || assert == MRT6MSG_WRMIFWHOLE) 1055 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) 1056 +sizeof(*msg)); 1057 else 1058 #endif 1059 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); 1060 1061 if (!skb) 1062 return -ENOBUFS; 1063 1064 /* I suppose that internal messages 1065 * do not require checksums */ 1066 1067 skb->ip_summed = CHECKSUM_UNNECESSARY; 1068 1069 #ifdef CONFIG_IPV6_PIMSM_V2 1070 if (assert == MRT6MSG_WHOLEPKT || assert == MRT6MSG_WRMIFWHOLE) { 1071 /* Ugly, but we have no choice with this interface. 1072 Duplicate old header, fix length etc. 1073 And all this only to mangle msg->im6_msgtype and 1074 to set msg->im6_mbz to "mbz" :-) 1075 */ 1076 __skb_pull(skb, skb_network_offset(pkt)); 1077 1078 skb_push(skb, sizeof(*msg)); 1079 skb_reset_transport_header(skb); 1080 msg = (struct mrt6msg *)skb_transport_header(skb); 1081 msg->im6_mbz = 0; 1082 msg->im6_msgtype = assert; 1083 if (assert == MRT6MSG_WRMIFWHOLE) 1084 msg->im6_mif = mifi; 1085 else 1086 msg->im6_mif = READ_ONCE(mrt->mroute_reg_vif_num); 1087 msg->im6_pad = 0; 1088 msg->im6_src = ipv6_hdr(pkt)->saddr; 1089 msg->im6_dst = ipv6_hdr(pkt)->daddr; 1090 1091 skb->ip_summed = CHECKSUM_UNNECESSARY; 1092 } else 1093 #endif 1094 { 1095 /* 1096 * Copy the IP header 1097 */ 1098 1099 skb_put(skb, sizeof(struct ipv6hdr)); 1100 skb_reset_network_header(skb); 1101 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); 1102 1103 /* 1104 * Add our header 1105 */ 1106 skb_put(skb, sizeof(*msg)); 1107 skb_reset_transport_header(skb); 1108 msg = (struct mrt6msg *)skb_transport_header(skb); 1109 1110 msg->im6_mbz = 0; 1111 msg->im6_msgtype = assert; 1112 msg->im6_mif = mifi; 1113 msg->im6_pad = 0; 1114 msg->im6_src = ipv6_hdr(pkt)->saddr; 1115 msg->im6_dst = ipv6_hdr(pkt)->daddr; 1116 1117 skb_dst_set(skb, dst_clone(skb_dst(pkt))); 1118 skb->ip_summed = CHECKSUM_UNNECESSARY; 1119 } 1120 1121 mroute6_sk = rcu_dereference(mrt->mroute_sk); 1122 if (!mroute6_sk) { 1123 kfree_skb(skb); 1124 return -EINVAL; 1125 } 1126 1127 mrt6msg_netlink_event(mrt, skb); 1128 1129 /* Deliver to user space multicast routing algorithms */ 1130 ret = sock_queue_rcv_skb(mroute6_sk, skb); 1131 1132 if (ret < 0) { 1133 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n"); 1134 kfree_skb(skb); 1135 } 1136 1137 return ret; 1138 } 1139 1140 /* Queue a packet for resolution. It gets locked cache entry! */ 1141 static int ip6mr_cache_unresolved(struct mr_table *mrt, mifi_t mifi, 1142 struct sk_buff *skb, struct net_device *dev) 1143 { 1144 struct mfc6_cache *c; 1145 bool found = false; 1146 int err; 1147 1148 spin_lock_bh(&mfc_unres_lock); 1149 list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) { 1150 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && 1151 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) { 1152 found = true; 1153 break; 1154 } 1155 } 1156 1157 if (!found) { 1158 /* 1159 * Create a new entry if allowable 1160 */ 1161 1162 c = ip6mr_cache_alloc_unres(); 1163 if (!c) { 1164 spin_unlock_bh(&mfc_unres_lock); 1165 1166 kfree_skb(skb); 1167 return -ENOBUFS; 1168 } 1169 1170 /* Fill in the new cache entry */ 1171 c->_c.mfc_parent = -1; 1172 c->mf6c_origin = ipv6_hdr(skb)->saddr; 1173 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; 1174 1175 /* 1176 * Reflect first query at pim6sd 1177 */ 1178 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE); 1179 if (err < 0) { 1180 /* If the report failed throw the cache entry 1181 out - Brad Parker 1182 */ 1183 spin_unlock_bh(&mfc_unres_lock); 1184 1185 ip6mr_cache_free(c); 1186 kfree_skb(skb); 1187 return err; 1188 } 1189 1190 atomic_inc(&mrt->cache_resolve_queue_len); 1191 list_add(&c->_c.list, &mrt->mfc_unres_queue); 1192 mr6_netlink_event(mrt, c, RTM_NEWROUTE); 1193 1194 ipmr_do_expire_process(mrt); 1195 } 1196 1197 /* See if we can append the packet */ 1198 if (c->_c.mfc_un.unres.unresolved.qlen > 3) { 1199 kfree_skb(skb); 1200 err = -ENOBUFS; 1201 } else { 1202 if (dev) { 1203 skb->dev = dev; 1204 skb->skb_iif = dev->ifindex; 1205 } 1206 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb); 1207 err = 0; 1208 } 1209 1210 spin_unlock_bh(&mfc_unres_lock); 1211 return err; 1212 } 1213 1214 /* 1215 * MFC6 cache manipulation by user space 1216 */ 1217 1218 static int ip6mr_mfc_delete(struct mr_table *mrt, struct mf6cctl *mfc, 1219 int parent) 1220 { 1221 struct mfc6_cache *c; 1222 1223 /* The entries are added/deleted only under RTNL */ 1224 rcu_read_lock(); 1225 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr, 1226 &mfc->mf6cc_mcastgrp.sin6_addr, parent); 1227 rcu_read_unlock(); 1228 if (!c) 1229 return -ENOENT; 1230 rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ip6mr_rht_params); 1231 list_del_rcu(&c->_c.list); 1232 1233 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net), 1234 FIB_EVENT_ENTRY_DEL, c, mrt->id); 1235 mr6_netlink_event(mrt, c, RTM_DELROUTE); 1236 mr_cache_put(&c->_c); 1237 return 0; 1238 } 1239 1240 static int ip6mr_device_event(struct notifier_block *this, 1241 unsigned long event, void *ptr) 1242 { 1243 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1244 struct net *net = dev_net(dev); 1245 struct mr_table *mrt; 1246 struct vif_device *v; 1247 int ct; 1248 1249 if (event != NETDEV_UNREGISTER) 1250 return NOTIFY_DONE; 1251 1252 ip6mr_for_each_table(mrt, net) { 1253 v = &mrt->vif_table[0]; 1254 for (ct = 0; ct < mrt->maxvif; ct++, v++) { 1255 if (rcu_access_pointer(v->dev) == dev) 1256 mif6_delete(mrt, ct, 1, NULL); 1257 } 1258 } 1259 1260 return NOTIFY_DONE; 1261 } 1262 1263 static unsigned int ip6mr_seq_read(struct net *net) 1264 { 1265 ASSERT_RTNL(); 1266 1267 return net->ipv6.ipmr_seq + ip6mr_rules_seq_read(net); 1268 } 1269 1270 static int ip6mr_dump(struct net *net, struct notifier_block *nb, 1271 struct netlink_ext_ack *extack) 1272 { 1273 return mr_dump(net, nb, RTNL_FAMILY_IP6MR, ip6mr_rules_dump, 1274 ip6mr_mr_table_iter, extack); 1275 } 1276 1277 static struct notifier_block ip6_mr_notifier = { 1278 .notifier_call = ip6mr_device_event 1279 }; 1280 1281 static const struct fib_notifier_ops ip6mr_notifier_ops_template = { 1282 .family = RTNL_FAMILY_IP6MR, 1283 .fib_seq_read = ip6mr_seq_read, 1284 .fib_dump = ip6mr_dump, 1285 .owner = THIS_MODULE, 1286 }; 1287 1288 static int __net_init ip6mr_notifier_init(struct net *net) 1289 { 1290 struct fib_notifier_ops *ops; 1291 1292 net->ipv6.ipmr_seq = 0; 1293 1294 ops = fib_notifier_ops_register(&ip6mr_notifier_ops_template, net); 1295 if (IS_ERR(ops)) 1296 return PTR_ERR(ops); 1297 1298 net->ipv6.ip6mr_notifier_ops = ops; 1299 1300 return 0; 1301 } 1302 1303 static void __net_exit ip6mr_notifier_exit(struct net *net) 1304 { 1305 fib_notifier_ops_unregister(net->ipv6.ip6mr_notifier_ops); 1306 net->ipv6.ip6mr_notifier_ops = NULL; 1307 } 1308 1309 /* Setup for IP multicast routing */ 1310 static int __net_init ip6mr_net_init(struct net *net) 1311 { 1312 int err; 1313 1314 err = ip6mr_notifier_init(net); 1315 if (err) 1316 return err; 1317 1318 err = ip6mr_rules_init(net); 1319 if (err < 0) 1320 goto ip6mr_rules_fail; 1321 1322 #ifdef CONFIG_PROC_FS 1323 err = -ENOMEM; 1324 if (!proc_create_net("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_seq_ops, 1325 sizeof(struct mr_vif_iter))) 1326 goto proc_vif_fail; 1327 if (!proc_create_net("ip6_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops, 1328 sizeof(struct mr_mfc_iter))) 1329 goto proc_cache_fail; 1330 #endif 1331 1332 return 0; 1333 1334 #ifdef CONFIG_PROC_FS 1335 proc_cache_fail: 1336 remove_proc_entry("ip6_mr_vif", net->proc_net); 1337 proc_vif_fail: 1338 rtnl_lock(); 1339 ip6mr_rules_exit(net); 1340 rtnl_unlock(); 1341 #endif 1342 ip6mr_rules_fail: 1343 ip6mr_notifier_exit(net); 1344 return err; 1345 } 1346 1347 static void __net_exit ip6mr_net_exit(struct net *net) 1348 { 1349 #ifdef CONFIG_PROC_FS 1350 remove_proc_entry("ip6_mr_cache", net->proc_net); 1351 remove_proc_entry("ip6_mr_vif", net->proc_net); 1352 #endif 1353 ip6mr_notifier_exit(net); 1354 } 1355 1356 static void __net_exit ip6mr_net_exit_batch(struct list_head *net_list) 1357 { 1358 struct net *net; 1359 1360 rtnl_lock(); 1361 list_for_each_entry(net, net_list, exit_list) 1362 ip6mr_rules_exit(net); 1363 rtnl_unlock(); 1364 } 1365 1366 static struct pernet_operations ip6mr_net_ops = { 1367 .init = ip6mr_net_init, 1368 .exit = ip6mr_net_exit, 1369 .exit_batch = ip6mr_net_exit_batch, 1370 }; 1371 1372 int __init ip6_mr_init(void) 1373 { 1374 int err; 1375 1376 mrt_cachep = kmem_cache_create("ip6_mrt_cache", 1377 sizeof(struct mfc6_cache), 1378 0, SLAB_HWCACHE_ALIGN, 1379 NULL); 1380 if (!mrt_cachep) 1381 return -ENOMEM; 1382 1383 err = register_pernet_subsys(&ip6mr_net_ops); 1384 if (err) 1385 goto reg_pernet_fail; 1386 1387 err = register_netdevice_notifier(&ip6_mr_notifier); 1388 if (err) 1389 goto reg_notif_fail; 1390 #ifdef CONFIG_IPV6_PIMSM_V2 1391 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) { 1392 pr_err("%s: can't add PIM protocol\n", __func__); 1393 err = -EAGAIN; 1394 goto add_proto_fail; 1395 } 1396 #endif 1397 err = rtnl_register_module(THIS_MODULE, RTNL_FAMILY_IP6MR, RTM_GETROUTE, 1398 ip6mr_rtm_getroute, ip6mr_rtm_dumproute, 0); 1399 if (err == 0) 1400 return 0; 1401 1402 #ifdef CONFIG_IPV6_PIMSM_V2 1403 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM); 1404 add_proto_fail: 1405 unregister_netdevice_notifier(&ip6_mr_notifier); 1406 #endif 1407 reg_notif_fail: 1408 unregister_pernet_subsys(&ip6mr_net_ops); 1409 reg_pernet_fail: 1410 kmem_cache_destroy(mrt_cachep); 1411 return err; 1412 } 1413 1414 void ip6_mr_cleanup(void) 1415 { 1416 rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE); 1417 #ifdef CONFIG_IPV6_PIMSM_V2 1418 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM); 1419 #endif 1420 unregister_netdevice_notifier(&ip6_mr_notifier); 1421 unregister_pernet_subsys(&ip6mr_net_ops); 1422 kmem_cache_destroy(mrt_cachep); 1423 } 1424 1425 static int ip6mr_mfc_add(struct net *net, struct mr_table *mrt, 1426 struct mf6cctl *mfc, int mrtsock, int parent) 1427 { 1428 unsigned char ttls[MAXMIFS]; 1429 struct mfc6_cache *uc, *c; 1430 struct mr_mfc *_uc; 1431 bool found; 1432 int i, err; 1433 1434 if (mfc->mf6cc_parent >= MAXMIFS) 1435 return -ENFILE; 1436 1437 memset(ttls, 255, MAXMIFS); 1438 for (i = 0; i < MAXMIFS; i++) { 1439 if (IF_ISSET(i, &mfc->mf6cc_ifset)) 1440 ttls[i] = 1; 1441 } 1442 1443 /* The entries are added/deleted only under RTNL */ 1444 rcu_read_lock(); 1445 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr, 1446 &mfc->mf6cc_mcastgrp.sin6_addr, parent); 1447 rcu_read_unlock(); 1448 if (c) { 1449 spin_lock(&mrt_lock); 1450 c->_c.mfc_parent = mfc->mf6cc_parent; 1451 ip6mr_update_thresholds(mrt, &c->_c, ttls); 1452 if (!mrtsock) 1453 c->_c.mfc_flags |= MFC_STATIC; 1454 spin_unlock(&mrt_lock); 1455 call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, 1456 c, mrt->id); 1457 mr6_netlink_event(mrt, c, RTM_NEWROUTE); 1458 return 0; 1459 } 1460 1461 if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) && 1462 !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) 1463 return -EINVAL; 1464 1465 c = ip6mr_cache_alloc(); 1466 if (!c) 1467 return -ENOMEM; 1468 1469 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; 1470 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; 1471 c->_c.mfc_parent = mfc->mf6cc_parent; 1472 ip6mr_update_thresholds(mrt, &c->_c, ttls); 1473 if (!mrtsock) 1474 c->_c.mfc_flags |= MFC_STATIC; 1475 1476 err = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode, 1477 ip6mr_rht_params); 1478 if (err) { 1479 pr_err("ip6mr: rhtable insert error %d\n", err); 1480 ip6mr_cache_free(c); 1481 return err; 1482 } 1483 list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list); 1484 1485 /* Check to see if we resolved a queued list. If so we 1486 * need to send on the frames and tidy up. 1487 */ 1488 found = false; 1489 spin_lock_bh(&mfc_unres_lock); 1490 list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) { 1491 uc = (struct mfc6_cache *)_uc; 1492 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && 1493 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { 1494 list_del(&_uc->list); 1495 atomic_dec(&mrt->cache_resolve_queue_len); 1496 found = true; 1497 break; 1498 } 1499 } 1500 if (list_empty(&mrt->mfc_unres_queue)) 1501 del_timer(&mrt->ipmr_expire_timer); 1502 spin_unlock_bh(&mfc_unres_lock); 1503 1504 if (found) { 1505 ip6mr_cache_resolve(net, mrt, uc, c); 1506 ip6mr_cache_free(uc); 1507 } 1508 call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, 1509 c, mrt->id); 1510 mr6_netlink_event(mrt, c, RTM_NEWROUTE); 1511 return 0; 1512 } 1513 1514 /* 1515 * Close the multicast socket, and clear the vif tables etc 1516 */ 1517 1518 static void mroute_clean_tables(struct mr_table *mrt, int flags) 1519 { 1520 struct mr_mfc *c, *tmp; 1521 LIST_HEAD(list); 1522 int i; 1523 1524 /* Shut down all active vif entries */ 1525 if (flags & (MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC)) { 1526 for (i = 0; i < mrt->maxvif; i++) { 1527 if (((mrt->vif_table[i].flags & VIFF_STATIC) && 1528 !(flags & MRT6_FLUSH_MIFS_STATIC)) || 1529 (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT6_FLUSH_MIFS))) 1530 continue; 1531 mif6_delete(mrt, i, 0, &list); 1532 } 1533 unregister_netdevice_many(&list); 1534 } 1535 1536 /* Wipe the cache */ 1537 if (flags & (MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC)) { 1538 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) { 1539 if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC_STATIC)) || 1540 (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC))) 1541 continue; 1542 rhltable_remove(&mrt->mfc_hash, &c->mnode, ip6mr_rht_params); 1543 list_del_rcu(&c->list); 1544 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net), 1545 FIB_EVENT_ENTRY_DEL, 1546 (struct mfc6_cache *)c, mrt->id); 1547 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE); 1548 mr_cache_put(c); 1549 } 1550 } 1551 1552 if (flags & MRT6_FLUSH_MFC) { 1553 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { 1554 spin_lock_bh(&mfc_unres_lock); 1555 list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) { 1556 list_del(&c->list); 1557 mr6_netlink_event(mrt, (struct mfc6_cache *)c, 1558 RTM_DELROUTE); 1559 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c); 1560 } 1561 spin_unlock_bh(&mfc_unres_lock); 1562 } 1563 } 1564 } 1565 1566 static int ip6mr_sk_init(struct mr_table *mrt, struct sock *sk) 1567 { 1568 int err = 0; 1569 struct net *net = sock_net(sk); 1570 1571 rtnl_lock(); 1572 spin_lock(&mrt_lock); 1573 if (rtnl_dereference(mrt->mroute_sk)) { 1574 err = -EADDRINUSE; 1575 } else { 1576 rcu_assign_pointer(mrt->mroute_sk, sk); 1577 sock_set_flag(sk, SOCK_RCU_FREE); 1578 atomic_inc(&net->ipv6.devconf_all->mc_forwarding); 1579 } 1580 spin_unlock(&mrt_lock); 1581 1582 if (!err) 1583 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 1584 NETCONFA_MC_FORWARDING, 1585 NETCONFA_IFINDEX_ALL, 1586 net->ipv6.devconf_all); 1587 rtnl_unlock(); 1588 1589 return err; 1590 } 1591 1592 int ip6mr_sk_done(struct sock *sk) 1593 { 1594 struct net *net = sock_net(sk); 1595 struct ipv6_devconf *devconf; 1596 struct mr_table *mrt; 1597 int err = -EACCES; 1598 1599 if (sk->sk_type != SOCK_RAW || 1600 inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1601 return err; 1602 1603 devconf = net->ipv6.devconf_all; 1604 if (!devconf || !atomic_read(&devconf->mc_forwarding)) 1605 return err; 1606 1607 rtnl_lock(); 1608 ip6mr_for_each_table(mrt, net) { 1609 if (sk == rtnl_dereference(mrt->mroute_sk)) { 1610 spin_lock(&mrt_lock); 1611 RCU_INIT_POINTER(mrt->mroute_sk, NULL); 1612 /* Note that mroute_sk had SOCK_RCU_FREE set, 1613 * so the RCU grace period before sk freeing 1614 * is guaranteed by sk_destruct() 1615 */ 1616 atomic_dec(&devconf->mc_forwarding); 1617 spin_unlock(&mrt_lock); 1618 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 1619 NETCONFA_MC_FORWARDING, 1620 NETCONFA_IFINDEX_ALL, 1621 net->ipv6.devconf_all); 1622 1623 mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MFC); 1624 err = 0; 1625 break; 1626 } 1627 } 1628 rtnl_unlock(); 1629 1630 return err; 1631 } 1632 1633 bool mroute6_is_socket(struct net *net, struct sk_buff *skb) 1634 { 1635 struct mr_table *mrt; 1636 struct flowi6 fl6 = { 1637 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, 1638 .flowi6_oif = skb->dev->ifindex, 1639 .flowi6_mark = skb->mark, 1640 }; 1641 1642 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) 1643 return NULL; 1644 1645 return rcu_access_pointer(mrt->mroute_sk); 1646 } 1647 EXPORT_SYMBOL(mroute6_is_socket); 1648 1649 /* 1650 * Socket options and virtual interface manipulation. The whole 1651 * virtual interface system is a complete heap, but unfortunately 1652 * that's how BSD mrouted happens to think. Maybe one day with a proper 1653 * MOSPF/PIM router set up we can clean this up. 1654 */ 1655 1656 int ip6_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval, 1657 unsigned int optlen) 1658 { 1659 int ret, parent = 0; 1660 struct mif6ctl vif; 1661 struct mf6cctl mfc; 1662 mifi_t mifi; 1663 struct net *net = sock_net(sk); 1664 struct mr_table *mrt; 1665 1666 if (sk->sk_type != SOCK_RAW || 1667 inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1668 return -EOPNOTSUPP; 1669 1670 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1671 if (!mrt) 1672 return -ENOENT; 1673 1674 if (optname != MRT6_INIT) { 1675 if (sk != rcu_access_pointer(mrt->mroute_sk) && 1676 !ns_capable(net->user_ns, CAP_NET_ADMIN)) 1677 return -EACCES; 1678 } 1679 1680 switch (optname) { 1681 case MRT6_INIT: 1682 if (optlen < sizeof(int)) 1683 return -EINVAL; 1684 1685 return ip6mr_sk_init(mrt, sk); 1686 1687 case MRT6_DONE: 1688 return ip6mr_sk_done(sk); 1689 1690 case MRT6_ADD_MIF: 1691 if (optlen < sizeof(vif)) 1692 return -EINVAL; 1693 if (copy_from_sockptr(&vif, optval, sizeof(vif))) 1694 return -EFAULT; 1695 if (vif.mif6c_mifi >= MAXMIFS) 1696 return -ENFILE; 1697 rtnl_lock(); 1698 ret = mif6_add(net, mrt, &vif, 1699 sk == rtnl_dereference(mrt->mroute_sk)); 1700 rtnl_unlock(); 1701 return ret; 1702 1703 case MRT6_DEL_MIF: 1704 if (optlen < sizeof(mifi_t)) 1705 return -EINVAL; 1706 if (copy_from_sockptr(&mifi, optval, sizeof(mifi_t))) 1707 return -EFAULT; 1708 rtnl_lock(); 1709 ret = mif6_delete(mrt, mifi, 0, NULL); 1710 rtnl_unlock(); 1711 return ret; 1712 1713 /* 1714 * Manipulate the forwarding caches. These live 1715 * in a sort of kernel/user symbiosis. 1716 */ 1717 case MRT6_ADD_MFC: 1718 case MRT6_DEL_MFC: 1719 parent = -1; 1720 fallthrough; 1721 case MRT6_ADD_MFC_PROXY: 1722 case MRT6_DEL_MFC_PROXY: 1723 if (optlen < sizeof(mfc)) 1724 return -EINVAL; 1725 if (copy_from_sockptr(&mfc, optval, sizeof(mfc))) 1726 return -EFAULT; 1727 if (parent == 0) 1728 parent = mfc.mf6cc_parent; 1729 rtnl_lock(); 1730 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY) 1731 ret = ip6mr_mfc_delete(mrt, &mfc, parent); 1732 else 1733 ret = ip6mr_mfc_add(net, mrt, &mfc, 1734 sk == 1735 rtnl_dereference(mrt->mroute_sk), 1736 parent); 1737 rtnl_unlock(); 1738 return ret; 1739 1740 case MRT6_FLUSH: 1741 { 1742 int flags; 1743 1744 if (optlen != sizeof(flags)) 1745 return -EINVAL; 1746 if (copy_from_sockptr(&flags, optval, sizeof(flags))) 1747 return -EFAULT; 1748 rtnl_lock(); 1749 mroute_clean_tables(mrt, flags); 1750 rtnl_unlock(); 1751 return 0; 1752 } 1753 1754 /* 1755 * Control PIM assert (to activate pim will activate assert) 1756 */ 1757 case MRT6_ASSERT: 1758 { 1759 int v; 1760 1761 if (optlen != sizeof(v)) 1762 return -EINVAL; 1763 if (copy_from_sockptr(&v, optval, sizeof(v))) 1764 return -EFAULT; 1765 mrt->mroute_do_assert = v; 1766 return 0; 1767 } 1768 1769 #ifdef CONFIG_IPV6_PIMSM_V2 1770 case MRT6_PIM: 1771 { 1772 bool do_wrmifwhole; 1773 int v; 1774 1775 if (optlen != sizeof(v)) 1776 return -EINVAL; 1777 if (copy_from_sockptr(&v, optval, sizeof(v))) 1778 return -EFAULT; 1779 1780 do_wrmifwhole = (v == MRT6MSG_WRMIFWHOLE); 1781 v = !!v; 1782 rtnl_lock(); 1783 ret = 0; 1784 if (v != mrt->mroute_do_pim) { 1785 mrt->mroute_do_pim = v; 1786 mrt->mroute_do_assert = v; 1787 mrt->mroute_do_wrvifwhole = do_wrmifwhole; 1788 } 1789 rtnl_unlock(); 1790 return ret; 1791 } 1792 1793 #endif 1794 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES 1795 case MRT6_TABLE: 1796 { 1797 u32 v; 1798 1799 if (optlen != sizeof(u32)) 1800 return -EINVAL; 1801 if (copy_from_sockptr(&v, optval, sizeof(v))) 1802 return -EFAULT; 1803 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */ 1804 if (v != RT_TABLE_DEFAULT && v >= 100000000) 1805 return -EINVAL; 1806 if (sk == rcu_access_pointer(mrt->mroute_sk)) 1807 return -EBUSY; 1808 1809 rtnl_lock(); 1810 ret = 0; 1811 mrt = ip6mr_new_table(net, v); 1812 if (IS_ERR(mrt)) 1813 ret = PTR_ERR(mrt); 1814 else 1815 raw6_sk(sk)->ip6mr_table = v; 1816 rtnl_unlock(); 1817 return ret; 1818 } 1819 #endif 1820 /* 1821 * Spurious command, or MRT6_VERSION which you cannot 1822 * set. 1823 */ 1824 default: 1825 return -ENOPROTOOPT; 1826 } 1827 } 1828 1829 /* 1830 * Getsock opt support for the multicast routing system. 1831 */ 1832 1833 int ip6_mroute_getsockopt(struct sock *sk, int optname, sockptr_t optval, 1834 sockptr_t optlen) 1835 { 1836 int olr; 1837 int val; 1838 struct net *net = sock_net(sk); 1839 struct mr_table *mrt; 1840 1841 if (sk->sk_type != SOCK_RAW || 1842 inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1843 return -EOPNOTSUPP; 1844 1845 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1846 if (!mrt) 1847 return -ENOENT; 1848 1849 switch (optname) { 1850 case MRT6_VERSION: 1851 val = 0x0305; 1852 break; 1853 #ifdef CONFIG_IPV6_PIMSM_V2 1854 case MRT6_PIM: 1855 val = mrt->mroute_do_pim; 1856 break; 1857 #endif 1858 case MRT6_ASSERT: 1859 val = mrt->mroute_do_assert; 1860 break; 1861 default: 1862 return -ENOPROTOOPT; 1863 } 1864 1865 if (copy_from_sockptr(&olr, optlen, sizeof(int))) 1866 return -EFAULT; 1867 1868 olr = min_t(int, olr, sizeof(int)); 1869 if (olr < 0) 1870 return -EINVAL; 1871 1872 if (copy_to_sockptr(optlen, &olr, sizeof(int))) 1873 return -EFAULT; 1874 if (copy_to_sockptr(optval, &val, olr)) 1875 return -EFAULT; 1876 return 0; 1877 } 1878 1879 /* 1880 * The IP multicast ioctl support routines. 1881 */ 1882 int ip6mr_ioctl(struct sock *sk, int cmd, void *arg) 1883 { 1884 struct sioc_sg_req6 *sr; 1885 struct sioc_mif_req6 *vr; 1886 struct vif_device *vif; 1887 struct mfc6_cache *c; 1888 struct net *net = sock_net(sk); 1889 struct mr_table *mrt; 1890 1891 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1892 if (!mrt) 1893 return -ENOENT; 1894 1895 switch (cmd) { 1896 case SIOCGETMIFCNT_IN6: 1897 vr = (struct sioc_mif_req6 *)arg; 1898 if (vr->mifi >= mrt->maxvif) 1899 return -EINVAL; 1900 vr->mifi = array_index_nospec(vr->mifi, mrt->maxvif); 1901 rcu_read_lock(); 1902 vif = &mrt->vif_table[vr->mifi]; 1903 if (VIF_EXISTS(mrt, vr->mifi)) { 1904 vr->icount = READ_ONCE(vif->pkt_in); 1905 vr->ocount = READ_ONCE(vif->pkt_out); 1906 vr->ibytes = READ_ONCE(vif->bytes_in); 1907 vr->obytes = READ_ONCE(vif->bytes_out); 1908 rcu_read_unlock(); 1909 return 0; 1910 } 1911 rcu_read_unlock(); 1912 return -EADDRNOTAVAIL; 1913 case SIOCGETSGCNT_IN6: 1914 sr = (struct sioc_sg_req6 *)arg; 1915 1916 rcu_read_lock(); 1917 c = ip6mr_cache_find(mrt, &sr->src.sin6_addr, 1918 &sr->grp.sin6_addr); 1919 if (c) { 1920 sr->pktcnt = c->_c.mfc_un.res.pkt; 1921 sr->bytecnt = c->_c.mfc_un.res.bytes; 1922 sr->wrong_if = c->_c.mfc_un.res.wrong_if; 1923 rcu_read_unlock(); 1924 return 0; 1925 } 1926 rcu_read_unlock(); 1927 return -EADDRNOTAVAIL; 1928 default: 1929 return -ENOIOCTLCMD; 1930 } 1931 } 1932 1933 #ifdef CONFIG_COMPAT 1934 struct compat_sioc_sg_req6 { 1935 struct sockaddr_in6 src; 1936 struct sockaddr_in6 grp; 1937 compat_ulong_t pktcnt; 1938 compat_ulong_t bytecnt; 1939 compat_ulong_t wrong_if; 1940 }; 1941 1942 struct compat_sioc_mif_req6 { 1943 mifi_t mifi; 1944 compat_ulong_t icount; 1945 compat_ulong_t ocount; 1946 compat_ulong_t ibytes; 1947 compat_ulong_t obytes; 1948 }; 1949 1950 int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) 1951 { 1952 struct compat_sioc_sg_req6 sr; 1953 struct compat_sioc_mif_req6 vr; 1954 struct vif_device *vif; 1955 struct mfc6_cache *c; 1956 struct net *net = sock_net(sk); 1957 struct mr_table *mrt; 1958 1959 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1960 if (!mrt) 1961 return -ENOENT; 1962 1963 switch (cmd) { 1964 case SIOCGETMIFCNT_IN6: 1965 if (copy_from_user(&vr, arg, sizeof(vr))) 1966 return -EFAULT; 1967 if (vr.mifi >= mrt->maxvif) 1968 return -EINVAL; 1969 vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif); 1970 rcu_read_lock(); 1971 vif = &mrt->vif_table[vr.mifi]; 1972 if (VIF_EXISTS(mrt, vr.mifi)) { 1973 vr.icount = READ_ONCE(vif->pkt_in); 1974 vr.ocount = READ_ONCE(vif->pkt_out); 1975 vr.ibytes = READ_ONCE(vif->bytes_in); 1976 vr.obytes = READ_ONCE(vif->bytes_out); 1977 rcu_read_unlock(); 1978 1979 if (copy_to_user(arg, &vr, sizeof(vr))) 1980 return -EFAULT; 1981 return 0; 1982 } 1983 rcu_read_unlock(); 1984 return -EADDRNOTAVAIL; 1985 case SIOCGETSGCNT_IN6: 1986 if (copy_from_user(&sr, arg, sizeof(sr))) 1987 return -EFAULT; 1988 1989 rcu_read_lock(); 1990 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); 1991 if (c) { 1992 sr.pktcnt = c->_c.mfc_un.res.pkt; 1993 sr.bytecnt = c->_c.mfc_un.res.bytes; 1994 sr.wrong_if = c->_c.mfc_un.res.wrong_if; 1995 rcu_read_unlock(); 1996 1997 if (copy_to_user(arg, &sr, sizeof(sr))) 1998 return -EFAULT; 1999 return 0; 2000 } 2001 rcu_read_unlock(); 2002 return -EADDRNOTAVAIL; 2003 default: 2004 return -ENOIOCTLCMD; 2005 } 2006 } 2007 #endif 2008 2009 static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb) 2010 { 2011 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), 2012 IPSTATS_MIB_OUTFORWDATAGRAMS); 2013 return dst_output(net, sk, skb); 2014 } 2015 2016 /* 2017 * Processing handlers for ip6mr_forward 2018 */ 2019 2020 static int ip6mr_forward2(struct net *net, struct mr_table *mrt, 2021 struct sk_buff *skb, int vifi) 2022 { 2023 struct vif_device *vif = &mrt->vif_table[vifi]; 2024 struct net_device *vif_dev; 2025 struct ipv6hdr *ipv6h; 2026 struct dst_entry *dst; 2027 struct flowi6 fl6; 2028 2029 vif_dev = vif_dev_read(vif); 2030 if (!vif_dev) 2031 goto out_free; 2032 2033 #ifdef CONFIG_IPV6_PIMSM_V2 2034 if (vif->flags & MIFF_REGISTER) { 2035 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1); 2036 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len); 2037 DEV_STATS_ADD(vif_dev, tx_bytes, skb->len); 2038 DEV_STATS_INC(vif_dev, tx_packets); 2039 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT); 2040 goto out_free; 2041 } 2042 #endif 2043 2044 ipv6h = ipv6_hdr(skb); 2045 2046 fl6 = (struct flowi6) { 2047 .flowi6_oif = vif->link, 2048 .daddr = ipv6h->daddr, 2049 }; 2050 2051 dst = ip6_route_output(net, NULL, &fl6); 2052 if (dst->error) { 2053 dst_release(dst); 2054 goto out_free; 2055 } 2056 2057 skb_dst_drop(skb); 2058 skb_dst_set(skb, dst); 2059 2060 /* 2061 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally 2062 * not only before forwarding, but after forwarding on all output 2063 * interfaces. It is clear, if mrouter runs a multicasting 2064 * program, it should receive packets not depending to what interface 2065 * program is joined. 2066 * If we will not make it, the program will have to join on all 2067 * interfaces. On the other hand, multihoming host (or router, but 2068 * not mrouter) cannot join to more than one interface - it will 2069 * result in receiving multiple packets. 2070 */ 2071 skb->dev = vif_dev; 2072 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1); 2073 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len); 2074 2075 /* We are about to write */ 2076 /* XXX: extension headers? */ 2077 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(vif_dev))) 2078 goto out_free; 2079 2080 ipv6h = ipv6_hdr(skb); 2081 ipv6h->hop_limit--; 2082 2083 IP6CB(skb)->flags |= IP6SKB_FORWARDED; 2084 2085 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, 2086 net, NULL, skb, skb->dev, vif_dev, 2087 ip6mr_forward2_finish); 2088 2089 out_free: 2090 kfree_skb(skb); 2091 return 0; 2092 } 2093 2094 /* Called with rcu_read_lock() */ 2095 static int ip6mr_find_vif(struct mr_table *mrt, struct net_device *dev) 2096 { 2097 int ct; 2098 2099 /* Pairs with WRITE_ONCE() in mif6_delete()/mif6_add() */ 2100 for (ct = READ_ONCE(mrt->maxvif) - 1; ct >= 0; ct--) { 2101 if (rcu_access_pointer(mrt->vif_table[ct].dev) == dev) 2102 break; 2103 } 2104 return ct; 2105 } 2106 2107 /* Called under rcu_read_lock() */ 2108 static void ip6_mr_forward(struct net *net, struct mr_table *mrt, 2109 struct net_device *dev, struct sk_buff *skb, 2110 struct mfc6_cache *c) 2111 { 2112 int psend = -1; 2113 int vif, ct; 2114 int true_vifi = ip6mr_find_vif(mrt, dev); 2115 2116 vif = c->_c.mfc_parent; 2117 c->_c.mfc_un.res.pkt++; 2118 c->_c.mfc_un.res.bytes += skb->len; 2119 c->_c.mfc_un.res.lastuse = jiffies; 2120 2121 if (ipv6_addr_any(&c->mf6c_origin) && true_vifi >= 0) { 2122 struct mfc6_cache *cache_proxy; 2123 2124 /* For an (*,G) entry, we only check that the incoming 2125 * interface is part of the static tree. 2126 */ 2127 cache_proxy = mr_mfc_find_any_parent(mrt, vif); 2128 if (cache_proxy && 2129 cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255) 2130 goto forward; 2131 } 2132 2133 /* 2134 * Wrong interface: drop packet and (maybe) send PIM assert. 2135 */ 2136 if (rcu_access_pointer(mrt->vif_table[vif].dev) != dev) { 2137 c->_c.mfc_un.res.wrong_if++; 2138 2139 if (true_vifi >= 0 && mrt->mroute_do_assert && 2140 /* pimsm uses asserts, when switching from RPT to SPT, 2141 so that we cannot check that packet arrived on an oif. 2142 It is bad, but otherwise we would need to move pretty 2143 large chunk of pimd to kernel. Ough... --ANK 2144 */ 2145 (mrt->mroute_do_pim || 2146 c->_c.mfc_un.res.ttls[true_vifi] < 255) && 2147 time_after(jiffies, 2148 c->_c.mfc_un.res.last_assert + 2149 MFC_ASSERT_THRESH)) { 2150 c->_c.mfc_un.res.last_assert = jiffies; 2151 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF); 2152 if (mrt->mroute_do_wrvifwhole) 2153 ip6mr_cache_report(mrt, skb, true_vifi, 2154 MRT6MSG_WRMIFWHOLE); 2155 } 2156 goto dont_forward; 2157 } 2158 2159 forward: 2160 WRITE_ONCE(mrt->vif_table[vif].pkt_in, 2161 mrt->vif_table[vif].pkt_in + 1); 2162 WRITE_ONCE(mrt->vif_table[vif].bytes_in, 2163 mrt->vif_table[vif].bytes_in + skb->len); 2164 2165 /* 2166 * Forward the frame 2167 */ 2168 if (ipv6_addr_any(&c->mf6c_origin) && 2169 ipv6_addr_any(&c->mf6c_mcastgrp)) { 2170 if (true_vifi >= 0 && 2171 true_vifi != c->_c.mfc_parent && 2172 ipv6_hdr(skb)->hop_limit > 2173 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) { 2174 /* It's an (*,*) entry and the packet is not coming from 2175 * the upstream: forward the packet to the upstream 2176 * only. 2177 */ 2178 psend = c->_c.mfc_parent; 2179 goto last_forward; 2180 } 2181 goto dont_forward; 2182 } 2183 for (ct = c->_c.mfc_un.res.maxvif - 1; 2184 ct >= c->_c.mfc_un.res.minvif; ct--) { 2185 /* For (*,G) entry, don't forward to the incoming interface */ 2186 if ((!ipv6_addr_any(&c->mf6c_origin) || ct != true_vifi) && 2187 ipv6_hdr(skb)->hop_limit > c->_c.mfc_un.res.ttls[ct]) { 2188 if (psend != -1) { 2189 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 2190 if (skb2) 2191 ip6mr_forward2(net, mrt, skb2, psend); 2192 } 2193 psend = ct; 2194 } 2195 } 2196 last_forward: 2197 if (psend != -1) { 2198 ip6mr_forward2(net, mrt, skb, psend); 2199 return; 2200 } 2201 2202 dont_forward: 2203 kfree_skb(skb); 2204 } 2205 2206 2207 /* 2208 * Multicast packets for forwarding arrive here 2209 */ 2210 2211 int ip6_mr_input(struct sk_buff *skb) 2212 { 2213 struct mfc6_cache *cache; 2214 struct net *net = dev_net(skb->dev); 2215 struct mr_table *mrt; 2216 struct flowi6 fl6 = { 2217 .flowi6_iif = skb->dev->ifindex, 2218 .flowi6_mark = skb->mark, 2219 }; 2220 int err; 2221 struct net_device *dev; 2222 2223 /* skb->dev passed in is the master dev for vrfs. 2224 * Get the proper interface that does have a vif associated with it. 2225 */ 2226 dev = skb->dev; 2227 if (netif_is_l3_master(skb->dev)) { 2228 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif); 2229 if (!dev) { 2230 kfree_skb(skb); 2231 return -ENODEV; 2232 } 2233 } 2234 2235 err = ip6mr_fib_lookup(net, &fl6, &mrt); 2236 if (err < 0) { 2237 kfree_skb(skb); 2238 return err; 2239 } 2240 2241 cache = ip6mr_cache_find(mrt, 2242 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); 2243 if (!cache) { 2244 int vif = ip6mr_find_vif(mrt, dev); 2245 2246 if (vif >= 0) 2247 cache = ip6mr_cache_find_any(mrt, 2248 &ipv6_hdr(skb)->daddr, 2249 vif); 2250 } 2251 2252 /* 2253 * No usable cache entry 2254 */ 2255 if (!cache) { 2256 int vif; 2257 2258 vif = ip6mr_find_vif(mrt, dev); 2259 if (vif >= 0) { 2260 int err = ip6mr_cache_unresolved(mrt, vif, skb, dev); 2261 2262 return err; 2263 } 2264 kfree_skb(skb); 2265 return -ENODEV; 2266 } 2267 2268 ip6_mr_forward(net, mrt, dev, skb, cache); 2269 2270 return 0; 2271 } 2272 2273 int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm, 2274 u32 portid) 2275 { 2276 int err; 2277 struct mr_table *mrt; 2278 struct mfc6_cache *cache; 2279 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); 2280 2281 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); 2282 if (!mrt) 2283 return -ENOENT; 2284 2285 rcu_read_lock(); 2286 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); 2287 if (!cache && skb->dev) { 2288 int vif = ip6mr_find_vif(mrt, skb->dev); 2289 2290 if (vif >= 0) 2291 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr, 2292 vif); 2293 } 2294 2295 if (!cache) { 2296 struct sk_buff *skb2; 2297 struct ipv6hdr *iph; 2298 struct net_device *dev; 2299 int vif; 2300 2301 dev = skb->dev; 2302 if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) { 2303 rcu_read_unlock(); 2304 return -ENODEV; 2305 } 2306 2307 /* really correct? */ 2308 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 2309 if (!skb2) { 2310 rcu_read_unlock(); 2311 return -ENOMEM; 2312 } 2313 2314 NETLINK_CB(skb2).portid = portid; 2315 skb_reset_transport_header(skb2); 2316 2317 skb_put(skb2, sizeof(struct ipv6hdr)); 2318 skb_reset_network_header(skb2); 2319 2320 iph = ipv6_hdr(skb2); 2321 iph->version = 0; 2322 iph->priority = 0; 2323 iph->flow_lbl[0] = 0; 2324 iph->flow_lbl[1] = 0; 2325 iph->flow_lbl[2] = 0; 2326 iph->payload_len = 0; 2327 iph->nexthdr = IPPROTO_NONE; 2328 iph->hop_limit = 0; 2329 iph->saddr = rt->rt6i_src.addr; 2330 iph->daddr = rt->rt6i_dst.addr; 2331 2332 err = ip6mr_cache_unresolved(mrt, vif, skb2, dev); 2333 rcu_read_unlock(); 2334 2335 return err; 2336 } 2337 2338 err = mr_fill_mroute(mrt, skb, &cache->_c, rtm); 2339 rcu_read_unlock(); 2340 return err; 2341 } 2342 2343 static int ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, 2344 u32 portid, u32 seq, struct mfc6_cache *c, int cmd, 2345 int flags) 2346 { 2347 struct nlmsghdr *nlh; 2348 struct rtmsg *rtm; 2349 int err; 2350 2351 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); 2352 if (!nlh) 2353 return -EMSGSIZE; 2354 2355 rtm = nlmsg_data(nlh); 2356 rtm->rtm_family = RTNL_FAMILY_IP6MR; 2357 rtm->rtm_dst_len = 128; 2358 rtm->rtm_src_len = 128; 2359 rtm->rtm_tos = 0; 2360 rtm->rtm_table = mrt->id; 2361 if (nla_put_u32(skb, RTA_TABLE, mrt->id)) 2362 goto nla_put_failure; 2363 rtm->rtm_type = RTN_MULTICAST; 2364 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2365 if (c->_c.mfc_flags & MFC_STATIC) 2366 rtm->rtm_protocol = RTPROT_STATIC; 2367 else 2368 rtm->rtm_protocol = RTPROT_MROUTED; 2369 rtm->rtm_flags = 0; 2370 2371 if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) || 2372 nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp)) 2373 goto nla_put_failure; 2374 err = mr_fill_mroute(mrt, skb, &c->_c, rtm); 2375 /* do not break the dump if cache is unresolved */ 2376 if (err < 0 && err != -ENOENT) 2377 goto nla_put_failure; 2378 2379 nlmsg_end(skb, nlh); 2380 return 0; 2381 2382 nla_put_failure: 2383 nlmsg_cancel(skb, nlh); 2384 return -EMSGSIZE; 2385 } 2386 2387 static int _ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, 2388 u32 portid, u32 seq, struct mr_mfc *c, 2389 int cmd, int flags) 2390 { 2391 return ip6mr_fill_mroute(mrt, skb, portid, seq, (struct mfc6_cache *)c, 2392 cmd, flags); 2393 } 2394 2395 static int mr6_msgsize(bool unresolved, int maxvif) 2396 { 2397 size_t len = 2398 NLMSG_ALIGN(sizeof(struct rtmsg)) 2399 + nla_total_size(4) /* RTA_TABLE */ 2400 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */ 2401 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */ 2402 ; 2403 2404 if (!unresolved) 2405 len = len 2406 + nla_total_size(4) /* RTA_IIF */ 2407 + nla_total_size(0) /* RTA_MULTIPATH */ 2408 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) 2409 /* RTA_MFC_STATS */ 2410 + nla_total_size_64bit(sizeof(struct rta_mfc_stats)) 2411 ; 2412 2413 return len; 2414 } 2415 2416 static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc, 2417 int cmd) 2418 { 2419 struct net *net = read_pnet(&mrt->net); 2420 struct sk_buff *skb; 2421 int err = -ENOBUFS; 2422 2423 skb = nlmsg_new(mr6_msgsize(mfc->_c.mfc_parent >= MAXMIFS, mrt->maxvif), 2424 GFP_ATOMIC); 2425 if (!skb) 2426 goto errout; 2427 2428 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); 2429 if (err < 0) 2430 goto errout; 2431 2432 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC); 2433 return; 2434 2435 errout: 2436 kfree_skb(skb); 2437 if (err < 0) 2438 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err); 2439 } 2440 2441 static size_t mrt6msg_netlink_msgsize(size_t payloadlen) 2442 { 2443 size_t len = 2444 NLMSG_ALIGN(sizeof(struct rtgenmsg)) 2445 + nla_total_size(1) /* IP6MRA_CREPORT_MSGTYPE */ 2446 + nla_total_size(4) /* IP6MRA_CREPORT_MIF_ID */ 2447 /* IP6MRA_CREPORT_SRC_ADDR */ 2448 + nla_total_size(sizeof(struct in6_addr)) 2449 /* IP6MRA_CREPORT_DST_ADDR */ 2450 + nla_total_size(sizeof(struct in6_addr)) 2451 /* IP6MRA_CREPORT_PKT */ 2452 + nla_total_size(payloadlen) 2453 ; 2454 2455 return len; 2456 } 2457 2458 static void mrt6msg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt) 2459 { 2460 struct net *net = read_pnet(&mrt->net); 2461 struct nlmsghdr *nlh; 2462 struct rtgenmsg *rtgenm; 2463 struct mrt6msg *msg; 2464 struct sk_buff *skb; 2465 struct nlattr *nla; 2466 int payloadlen; 2467 2468 payloadlen = pkt->len - sizeof(struct mrt6msg); 2469 msg = (struct mrt6msg *)skb_transport_header(pkt); 2470 2471 skb = nlmsg_new(mrt6msg_netlink_msgsize(payloadlen), GFP_ATOMIC); 2472 if (!skb) 2473 goto errout; 2474 2475 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT, 2476 sizeof(struct rtgenmsg), 0); 2477 if (!nlh) 2478 goto errout; 2479 rtgenm = nlmsg_data(nlh); 2480 rtgenm->rtgen_family = RTNL_FAMILY_IP6MR; 2481 if (nla_put_u8(skb, IP6MRA_CREPORT_MSGTYPE, msg->im6_msgtype) || 2482 nla_put_u32(skb, IP6MRA_CREPORT_MIF_ID, msg->im6_mif) || 2483 nla_put_in6_addr(skb, IP6MRA_CREPORT_SRC_ADDR, 2484 &msg->im6_src) || 2485 nla_put_in6_addr(skb, IP6MRA_CREPORT_DST_ADDR, 2486 &msg->im6_dst)) 2487 goto nla_put_failure; 2488 2489 nla = nla_reserve(skb, IP6MRA_CREPORT_PKT, payloadlen); 2490 if (!nla || skb_copy_bits(pkt, sizeof(struct mrt6msg), 2491 nla_data(nla), payloadlen)) 2492 goto nla_put_failure; 2493 2494 nlmsg_end(skb, nlh); 2495 2496 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE_R, NULL, GFP_ATOMIC); 2497 return; 2498 2499 nla_put_failure: 2500 nlmsg_cancel(skb, nlh); 2501 errout: 2502 kfree_skb(skb); 2503 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS); 2504 } 2505 2506 static const struct nla_policy ip6mr_getroute_policy[RTA_MAX + 1] = { 2507 [RTA_SRC] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 2508 [RTA_DST] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 2509 [RTA_TABLE] = { .type = NLA_U32 }, 2510 }; 2511 2512 static int ip6mr_rtm_valid_getroute_req(struct sk_buff *skb, 2513 const struct nlmsghdr *nlh, 2514 struct nlattr **tb, 2515 struct netlink_ext_ack *extack) 2516 { 2517 struct rtmsg *rtm; 2518 int err; 2519 2520 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, ip6mr_getroute_policy, 2521 extack); 2522 if (err) 2523 return err; 2524 2525 rtm = nlmsg_data(nlh); 2526 if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) || 2527 (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) || 2528 rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol || 2529 rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) { 2530 NL_SET_ERR_MSG_MOD(extack, 2531 "Invalid values in header for multicast route get request"); 2532 return -EINVAL; 2533 } 2534 2535 if ((tb[RTA_SRC] && !rtm->rtm_src_len) || 2536 (tb[RTA_DST] && !rtm->rtm_dst_len)) { 2537 NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6"); 2538 return -EINVAL; 2539 } 2540 2541 return 0; 2542 } 2543 2544 static int ip6mr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, 2545 struct netlink_ext_ack *extack) 2546 { 2547 struct net *net = sock_net(in_skb->sk); 2548 struct in6_addr src = {}, grp = {}; 2549 struct nlattr *tb[RTA_MAX + 1]; 2550 struct mfc6_cache *cache; 2551 struct mr_table *mrt; 2552 struct sk_buff *skb; 2553 u32 tableid; 2554 int err; 2555 2556 err = ip6mr_rtm_valid_getroute_req(in_skb, nlh, tb, extack); 2557 if (err < 0) 2558 return err; 2559 2560 if (tb[RTA_SRC]) 2561 src = nla_get_in6_addr(tb[RTA_SRC]); 2562 if (tb[RTA_DST]) 2563 grp = nla_get_in6_addr(tb[RTA_DST]); 2564 tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0; 2565 2566 mrt = ip6mr_get_table(net, tableid ?: RT_TABLE_DEFAULT); 2567 if (!mrt) { 2568 NL_SET_ERR_MSG_MOD(extack, "MR table does not exist"); 2569 return -ENOENT; 2570 } 2571 2572 /* entries are added/deleted only under RTNL */ 2573 rcu_read_lock(); 2574 cache = ip6mr_cache_find(mrt, &src, &grp); 2575 rcu_read_unlock(); 2576 if (!cache) { 2577 NL_SET_ERR_MSG_MOD(extack, "MR cache entry not found"); 2578 return -ENOENT; 2579 } 2580 2581 skb = nlmsg_new(mr6_msgsize(false, mrt->maxvif), GFP_KERNEL); 2582 if (!skb) 2583 return -ENOBUFS; 2584 2585 err = ip6mr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid, 2586 nlh->nlmsg_seq, cache, RTM_NEWROUTE, 0); 2587 if (err < 0) { 2588 kfree_skb(skb); 2589 return err; 2590 } 2591 2592 return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 2593 } 2594 2595 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) 2596 { 2597 const struct nlmsghdr *nlh = cb->nlh; 2598 struct fib_dump_filter filter = {}; 2599 int err; 2600 2601 if (cb->strict_check) { 2602 err = ip_valid_fib_dump_req(sock_net(skb->sk), nlh, 2603 &filter, cb); 2604 if (err < 0) 2605 return err; 2606 } 2607 2608 if (filter.table_id) { 2609 struct mr_table *mrt; 2610 2611 mrt = ip6mr_get_table(sock_net(skb->sk), filter.table_id); 2612 if (!mrt) { 2613 if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IP6MR) 2614 return skb->len; 2615 2616 NL_SET_ERR_MSG_MOD(cb->extack, "MR table does not exist"); 2617 return -ENOENT; 2618 } 2619 err = mr_table_dump(mrt, skb, cb, _ip6mr_fill_mroute, 2620 &mfc_unres_lock, &filter); 2621 return skb->len ? : err; 2622 } 2623 2624 return mr_rtm_dumproute(skb, cb, ip6mr_mr_table_iter, 2625 _ip6mr_fill_mroute, &mfc_unres_lock, &filter); 2626 } 2627