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_push(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 1883 int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) 1884 { 1885 struct sioc_sg_req6 sr; 1886 struct sioc_mif_req6 vr; 1887 struct vif_device *vif; 1888 struct mfc6_cache *c; 1889 struct net *net = sock_net(sk); 1890 struct mr_table *mrt; 1891 1892 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1893 if (!mrt) 1894 return -ENOENT; 1895 1896 switch (cmd) { 1897 case SIOCGETMIFCNT_IN6: 1898 if (copy_from_user(&vr, arg, sizeof(vr))) 1899 return -EFAULT; 1900 if (vr.mifi >= mrt->maxvif) 1901 return -EINVAL; 1902 vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif); 1903 rcu_read_lock(); 1904 vif = &mrt->vif_table[vr.mifi]; 1905 if (VIF_EXISTS(mrt, vr.mifi)) { 1906 vr.icount = READ_ONCE(vif->pkt_in); 1907 vr.ocount = READ_ONCE(vif->pkt_out); 1908 vr.ibytes = READ_ONCE(vif->bytes_in); 1909 vr.obytes = READ_ONCE(vif->bytes_out); 1910 rcu_read_unlock(); 1911 1912 if (copy_to_user(arg, &vr, sizeof(vr))) 1913 return -EFAULT; 1914 return 0; 1915 } 1916 rcu_read_unlock(); 1917 return -EADDRNOTAVAIL; 1918 case SIOCGETSGCNT_IN6: 1919 if (copy_from_user(&sr, arg, sizeof(sr))) 1920 return -EFAULT; 1921 1922 rcu_read_lock(); 1923 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); 1924 if (c) { 1925 sr.pktcnt = c->_c.mfc_un.res.pkt; 1926 sr.bytecnt = c->_c.mfc_un.res.bytes; 1927 sr.wrong_if = c->_c.mfc_un.res.wrong_if; 1928 rcu_read_unlock(); 1929 1930 if (copy_to_user(arg, &sr, sizeof(sr))) 1931 return -EFAULT; 1932 return 0; 1933 } 1934 rcu_read_unlock(); 1935 return -EADDRNOTAVAIL; 1936 default: 1937 return -ENOIOCTLCMD; 1938 } 1939 } 1940 1941 #ifdef CONFIG_COMPAT 1942 struct compat_sioc_sg_req6 { 1943 struct sockaddr_in6 src; 1944 struct sockaddr_in6 grp; 1945 compat_ulong_t pktcnt; 1946 compat_ulong_t bytecnt; 1947 compat_ulong_t wrong_if; 1948 }; 1949 1950 struct compat_sioc_mif_req6 { 1951 mifi_t mifi; 1952 compat_ulong_t icount; 1953 compat_ulong_t ocount; 1954 compat_ulong_t ibytes; 1955 compat_ulong_t obytes; 1956 }; 1957 1958 int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) 1959 { 1960 struct compat_sioc_sg_req6 sr; 1961 struct compat_sioc_mif_req6 vr; 1962 struct vif_device *vif; 1963 struct mfc6_cache *c; 1964 struct net *net = sock_net(sk); 1965 struct mr_table *mrt; 1966 1967 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1968 if (!mrt) 1969 return -ENOENT; 1970 1971 switch (cmd) { 1972 case SIOCGETMIFCNT_IN6: 1973 if (copy_from_user(&vr, arg, sizeof(vr))) 1974 return -EFAULT; 1975 if (vr.mifi >= mrt->maxvif) 1976 return -EINVAL; 1977 vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif); 1978 rcu_read_lock(); 1979 vif = &mrt->vif_table[vr.mifi]; 1980 if (VIF_EXISTS(mrt, vr.mifi)) { 1981 vr.icount = READ_ONCE(vif->pkt_in); 1982 vr.ocount = READ_ONCE(vif->pkt_out); 1983 vr.ibytes = READ_ONCE(vif->bytes_in); 1984 vr.obytes = READ_ONCE(vif->bytes_out); 1985 rcu_read_unlock(); 1986 1987 if (copy_to_user(arg, &vr, sizeof(vr))) 1988 return -EFAULT; 1989 return 0; 1990 } 1991 rcu_read_unlock(); 1992 return -EADDRNOTAVAIL; 1993 case SIOCGETSGCNT_IN6: 1994 if (copy_from_user(&sr, arg, sizeof(sr))) 1995 return -EFAULT; 1996 1997 rcu_read_lock(); 1998 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); 1999 if (c) { 2000 sr.pktcnt = c->_c.mfc_un.res.pkt; 2001 sr.bytecnt = c->_c.mfc_un.res.bytes; 2002 sr.wrong_if = c->_c.mfc_un.res.wrong_if; 2003 rcu_read_unlock(); 2004 2005 if (copy_to_user(arg, &sr, sizeof(sr))) 2006 return -EFAULT; 2007 return 0; 2008 } 2009 rcu_read_unlock(); 2010 return -EADDRNOTAVAIL; 2011 default: 2012 return -ENOIOCTLCMD; 2013 } 2014 } 2015 #endif 2016 2017 static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb) 2018 { 2019 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), 2020 IPSTATS_MIB_OUTFORWDATAGRAMS); 2021 IP6_ADD_STATS(net, ip6_dst_idev(skb_dst(skb)), 2022 IPSTATS_MIB_OUTOCTETS, skb->len); 2023 return dst_output(net, sk, skb); 2024 } 2025 2026 /* 2027 * Processing handlers for ip6mr_forward 2028 */ 2029 2030 static int ip6mr_forward2(struct net *net, struct mr_table *mrt, 2031 struct sk_buff *skb, int vifi) 2032 { 2033 struct vif_device *vif = &mrt->vif_table[vifi]; 2034 struct net_device *vif_dev; 2035 struct ipv6hdr *ipv6h; 2036 struct dst_entry *dst; 2037 struct flowi6 fl6; 2038 2039 vif_dev = vif_dev_read(vif); 2040 if (!vif_dev) 2041 goto out_free; 2042 2043 #ifdef CONFIG_IPV6_PIMSM_V2 2044 if (vif->flags & MIFF_REGISTER) { 2045 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1); 2046 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len); 2047 DEV_STATS_ADD(vif_dev, tx_bytes, skb->len); 2048 DEV_STATS_INC(vif_dev, tx_packets); 2049 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT); 2050 goto out_free; 2051 } 2052 #endif 2053 2054 ipv6h = ipv6_hdr(skb); 2055 2056 fl6 = (struct flowi6) { 2057 .flowi6_oif = vif->link, 2058 .daddr = ipv6h->daddr, 2059 }; 2060 2061 dst = ip6_route_output(net, NULL, &fl6); 2062 if (dst->error) { 2063 dst_release(dst); 2064 goto out_free; 2065 } 2066 2067 skb_dst_drop(skb); 2068 skb_dst_set(skb, dst); 2069 2070 /* 2071 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally 2072 * not only before forwarding, but after forwarding on all output 2073 * interfaces. It is clear, if mrouter runs a multicasting 2074 * program, it should receive packets not depending to what interface 2075 * program is joined. 2076 * If we will not make it, the program will have to join on all 2077 * interfaces. On the other hand, multihoming host (or router, but 2078 * not mrouter) cannot join to more than one interface - it will 2079 * result in receiving multiple packets. 2080 */ 2081 skb->dev = vif_dev; 2082 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1); 2083 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len); 2084 2085 /* We are about to write */ 2086 /* XXX: extension headers? */ 2087 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(vif_dev))) 2088 goto out_free; 2089 2090 ipv6h = ipv6_hdr(skb); 2091 ipv6h->hop_limit--; 2092 2093 IP6CB(skb)->flags |= IP6SKB_FORWARDED; 2094 2095 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, 2096 net, NULL, skb, skb->dev, vif_dev, 2097 ip6mr_forward2_finish); 2098 2099 out_free: 2100 kfree_skb(skb); 2101 return 0; 2102 } 2103 2104 /* Called with rcu_read_lock() */ 2105 static int ip6mr_find_vif(struct mr_table *mrt, struct net_device *dev) 2106 { 2107 int ct; 2108 2109 /* Pairs with WRITE_ONCE() in mif6_delete()/mif6_add() */ 2110 for (ct = READ_ONCE(mrt->maxvif) - 1; ct >= 0; ct--) { 2111 if (rcu_access_pointer(mrt->vif_table[ct].dev) == dev) 2112 break; 2113 } 2114 return ct; 2115 } 2116 2117 /* Called under rcu_read_lock() */ 2118 static void ip6_mr_forward(struct net *net, struct mr_table *mrt, 2119 struct net_device *dev, struct sk_buff *skb, 2120 struct mfc6_cache *c) 2121 { 2122 int psend = -1; 2123 int vif, ct; 2124 int true_vifi = ip6mr_find_vif(mrt, dev); 2125 2126 vif = c->_c.mfc_parent; 2127 c->_c.mfc_un.res.pkt++; 2128 c->_c.mfc_un.res.bytes += skb->len; 2129 c->_c.mfc_un.res.lastuse = jiffies; 2130 2131 if (ipv6_addr_any(&c->mf6c_origin) && true_vifi >= 0) { 2132 struct mfc6_cache *cache_proxy; 2133 2134 /* For an (*,G) entry, we only check that the incoming 2135 * interface is part of the static tree. 2136 */ 2137 cache_proxy = mr_mfc_find_any_parent(mrt, vif); 2138 if (cache_proxy && 2139 cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255) 2140 goto forward; 2141 } 2142 2143 /* 2144 * Wrong interface: drop packet and (maybe) send PIM assert. 2145 */ 2146 if (rcu_access_pointer(mrt->vif_table[vif].dev) != dev) { 2147 c->_c.mfc_un.res.wrong_if++; 2148 2149 if (true_vifi >= 0 && mrt->mroute_do_assert && 2150 /* pimsm uses asserts, when switching from RPT to SPT, 2151 so that we cannot check that packet arrived on an oif. 2152 It is bad, but otherwise we would need to move pretty 2153 large chunk of pimd to kernel. Ough... --ANK 2154 */ 2155 (mrt->mroute_do_pim || 2156 c->_c.mfc_un.res.ttls[true_vifi] < 255) && 2157 time_after(jiffies, 2158 c->_c.mfc_un.res.last_assert + 2159 MFC_ASSERT_THRESH)) { 2160 c->_c.mfc_un.res.last_assert = jiffies; 2161 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF); 2162 if (mrt->mroute_do_wrvifwhole) 2163 ip6mr_cache_report(mrt, skb, true_vifi, 2164 MRT6MSG_WRMIFWHOLE); 2165 } 2166 goto dont_forward; 2167 } 2168 2169 forward: 2170 WRITE_ONCE(mrt->vif_table[vif].pkt_in, 2171 mrt->vif_table[vif].pkt_in + 1); 2172 WRITE_ONCE(mrt->vif_table[vif].bytes_in, 2173 mrt->vif_table[vif].bytes_in + skb->len); 2174 2175 /* 2176 * Forward the frame 2177 */ 2178 if (ipv6_addr_any(&c->mf6c_origin) && 2179 ipv6_addr_any(&c->mf6c_mcastgrp)) { 2180 if (true_vifi >= 0 && 2181 true_vifi != c->_c.mfc_parent && 2182 ipv6_hdr(skb)->hop_limit > 2183 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) { 2184 /* It's an (*,*) entry and the packet is not coming from 2185 * the upstream: forward the packet to the upstream 2186 * only. 2187 */ 2188 psend = c->_c.mfc_parent; 2189 goto last_forward; 2190 } 2191 goto dont_forward; 2192 } 2193 for (ct = c->_c.mfc_un.res.maxvif - 1; 2194 ct >= c->_c.mfc_un.res.minvif; ct--) { 2195 /* For (*,G) entry, don't forward to the incoming interface */ 2196 if ((!ipv6_addr_any(&c->mf6c_origin) || ct != true_vifi) && 2197 ipv6_hdr(skb)->hop_limit > c->_c.mfc_un.res.ttls[ct]) { 2198 if (psend != -1) { 2199 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 2200 if (skb2) 2201 ip6mr_forward2(net, mrt, skb2, psend); 2202 } 2203 psend = ct; 2204 } 2205 } 2206 last_forward: 2207 if (psend != -1) { 2208 ip6mr_forward2(net, mrt, skb, psend); 2209 return; 2210 } 2211 2212 dont_forward: 2213 kfree_skb(skb); 2214 } 2215 2216 2217 /* 2218 * Multicast packets for forwarding arrive here 2219 */ 2220 2221 int ip6_mr_input(struct sk_buff *skb) 2222 { 2223 struct mfc6_cache *cache; 2224 struct net *net = dev_net(skb->dev); 2225 struct mr_table *mrt; 2226 struct flowi6 fl6 = { 2227 .flowi6_iif = skb->dev->ifindex, 2228 .flowi6_mark = skb->mark, 2229 }; 2230 int err; 2231 struct net_device *dev; 2232 2233 /* skb->dev passed in is the master dev for vrfs. 2234 * Get the proper interface that does have a vif associated with it. 2235 */ 2236 dev = skb->dev; 2237 if (netif_is_l3_master(skb->dev)) { 2238 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif); 2239 if (!dev) { 2240 kfree_skb(skb); 2241 return -ENODEV; 2242 } 2243 } 2244 2245 err = ip6mr_fib_lookup(net, &fl6, &mrt); 2246 if (err < 0) { 2247 kfree_skb(skb); 2248 return err; 2249 } 2250 2251 cache = ip6mr_cache_find(mrt, 2252 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); 2253 if (!cache) { 2254 int vif = ip6mr_find_vif(mrt, dev); 2255 2256 if (vif >= 0) 2257 cache = ip6mr_cache_find_any(mrt, 2258 &ipv6_hdr(skb)->daddr, 2259 vif); 2260 } 2261 2262 /* 2263 * No usable cache entry 2264 */ 2265 if (!cache) { 2266 int vif; 2267 2268 vif = ip6mr_find_vif(mrt, dev); 2269 if (vif >= 0) { 2270 int err = ip6mr_cache_unresolved(mrt, vif, skb, dev); 2271 2272 return err; 2273 } 2274 kfree_skb(skb); 2275 return -ENODEV; 2276 } 2277 2278 ip6_mr_forward(net, mrt, dev, skb, cache); 2279 2280 return 0; 2281 } 2282 2283 int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm, 2284 u32 portid) 2285 { 2286 int err; 2287 struct mr_table *mrt; 2288 struct mfc6_cache *cache; 2289 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); 2290 2291 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); 2292 if (!mrt) 2293 return -ENOENT; 2294 2295 rcu_read_lock(); 2296 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); 2297 if (!cache && skb->dev) { 2298 int vif = ip6mr_find_vif(mrt, skb->dev); 2299 2300 if (vif >= 0) 2301 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr, 2302 vif); 2303 } 2304 2305 if (!cache) { 2306 struct sk_buff *skb2; 2307 struct ipv6hdr *iph; 2308 struct net_device *dev; 2309 int vif; 2310 2311 dev = skb->dev; 2312 if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) { 2313 rcu_read_unlock(); 2314 return -ENODEV; 2315 } 2316 2317 /* really correct? */ 2318 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 2319 if (!skb2) { 2320 rcu_read_unlock(); 2321 return -ENOMEM; 2322 } 2323 2324 NETLINK_CB(skb2).portid = portid; 2325 skb_reset_transport_header(skb2); 2326 2327 skb_put(skb2, sizeof(struct ipv6hdr)); 2328 skb_reset_network_header(skb2); 2329 2330 iph = ipv6_hdr(skb2); 2331 iph->version = 0; 2332 iph->priority = 0; 2333 iph->flow_lbl[0] = 0; 2334 iph->flow_lbl[1] = 0; 2335 iph->flow_lbl[2] = 0; 2336 iph->payload_len = 0; 2337 iph->nexthdr = IPPROTO_NONE; 2338 iph->hop_limit = 0; 2339 iph->saddr = rt->rt6i_src.addr; 2340 iph->daddr = rt->rt6i_dst.addr; 2341 2342 err = ip6mr_cache_unresolved(mrt, vif, skb2, dev); 2343 rcu_read_unlock(); 2344 2345 return err; 2346 } 2347 2348 err = mr_fill_mroute(mrt, skb, &cache->_c, rtm); 2349 rcu_read_unlock(); 2350 return err; 2351 } 2352 2353 static int ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, 2354 u32 portid, u32 seq, struct mfc6_cache *c, int cmd, 2355 int flags) 2356 { 2357 struct nlmsghdr *nlh; 2358 struct rtmsg *rtm; 2359 int err; 2360 2361 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); 2362 if (!nlh) 2363 return -EMSGSIZE; 2364 2365 rtm = nlmsg_data(nlh); 2366 rtm->rtm_family = RTNL_FAMILY_IP6MR; 2367 rtm->rtm_dst_len = 128; 2368 rtm->rtm_src_len = 128; 2369 rtm->rtm_tos = 0; 2370 rtm->rtm_table = mrt->id; 2371 if (nla_put_u32(skb, RTA_TABLE, mrt->id)) 2372 goto nla_put_failure; 2373 rtm->rtm_type = RTN_MULTICAST; 2374 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2375 if (c->_c.mfc_flags & MFC_STATIC) 2376 rtm->rtm_protocol = RTPROT_STATIC; 2377 else 2378 rtm->rtm_protocol = RTPROT_MROUTED; 2379 rtm->rtm_flags = 0; 2380 2381 if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) || 2382 nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp)) 2383 goto nla_put_failure; 2384 err = mr_fill_mroute(mrt, skb, &c->_c, rtm); 2385 /* do not break the dump if cache is unresolved */ 2386 if (err < 0 && err != -ENOENT) 2387 goto nla_put_failure; 2388 2389 nlmsg_end(skb, nlh); 2390 return 0; 2391 2392 nla_put_failure: 2393 nlmsg_cancel(skb, nlh); 2394 return -EMSGSIZE; 2395 } 2396 2397 static int _ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, 2398 u32 portid, u32 seq, struct mr_mfc *c, 2399 int cmd, int flags) 2400 { 2401 return ip6mr_fill_mroute(mrt, skb, portid, seq, (struct mfc6_cache *)c, 2402 cmd, flags); 2403 } 2404 2405 static int mr6_msgsize(bool unresolved, int maxvif) 2406 { 2407 size_t len = 2408 NLMSG_ALIGN(sizeof(struct rtmsg)) 2409 + nla_total_size(4) /* RTA_TABLE */ 2410 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */ 2411 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */ 2412 ; 2413 2414 if (!unresolved) 2415 len = len 2416 + nla_total_size(4) /* RTA_IIF */ 2417 + nla_total_size(0) /* RTA_MULTIPATH */ 2418 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) 2419 /* RTA_MFC_STATS */ 2420 + nla_total_size_64bit(sizeof(struct rta_mfc_stats)) 2421 ; 2422 2423 return len; 2424 } 2425 2426 static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc, 2427 int cmd) 2428 { 2429 struct net *net = read_pnet(&mrt->net); 2430 struct sk_buff *skb; 2431 int err = -ENOBUFS; 2432 2433 skb = nlmsg_new(mr6_msgsize(mfc->_c.mfc_parent >= MAXMIFS, mrt->maxvif), 2434 GFP_ATOMIC); 2435 if (!skb) 2436 goto errout; 2437 2438 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); 2439 if (err < 0) 2440 goto errout; 2441 2442 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC); 2443 return; 2444 2445 errout: 2446 kfree_skb(skb); 2447 if (err < 0) 2448 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err); 2449 } 2450 2451 static size_t mrt6msg_netlink_msgsize(size_t payloadlen) 2452 { 2453 size_t len = 2454 NLMSG_ALIGN(sizeof(struct rtgenmsg)) 2455 + nla_total_size(1) /* IP6MRA_CREPORT_MSGTYPE */ 2456 + nla_total_size(4) /* IP6MRA_CREPORT_MIF_ID */ 2457 /* IP6MRA_CREPORT_SRC_ADDR */ 2458 + nla_total_size(sizeof(struct in6_addr)) 2459 /* IP6MRA_CREPORT_DST_ADDR */ 2460 + nla_total_size(sizeof(struct in6_addr)) 2461 /* IP6MRA_CREPORT_PKT */ 2462 + nla_total_size(payloadlen) 2463 ; 2464 2465 return len; 2466 } 2467 2468 static void mrt6msg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt) 2469 { 2470 struct net *net = read_pnet(&mrt->net); 2471 struct nlmsghdr *nlh; 2472 struct rtgenmsg *rtgenm; 2473 struct mrt6msg *msg; 2474 struct sk_buff *skb; 2475 struct nlattr *nla; 2476 int payloadlen; 2477 2478 payloadlen = pkt->len - sizeof(struct mrt6msg); 2479 msg = (struct mrt6msg *)skb_transport_header(pkt); 2480 2481 skb = nlmsg_new(mrt6msg_netlink_msgsize(payloadlen), GFP_ATOMIC); 2482 if (!skb) 2483 goto errout; 2484 2485 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT, 2486 sizeof(struct rtgenmsg), 0); 2487 if (!nlh) 2488 goto errout; 2489 rtgenm = nlmsg_data(nlh); 2490 rtgenm->rtgen_family = RTNL_FAMILY_IP6MR; 2491 if (nla_put_u8(skb, IP6MRA_CREPORT_MSGTYPE, msg->im6_msgtype) || 2492 nla_put_u32(skb, IP6MRA_CREPORT_MIF_ID, msg->im6_mif) || 2493 nla_put_in6_addr(skb, IP6MRA_CREPORT_SRC_ADDR, 2494 &msg->im6_src) || 2495 nla_put_in6_addr(skb, IP6MRA_CREPORT_DST_ADDR, 2496 &msg->im6_dst)) 2497 goto nla_put_failure; 2498 2499 nla = nla_reserve(skb, IP6MRA_CREPORT_PKT, payloadlen); 2500 if (!nla || skb_copy_bits(pkt, sizeof(struct mrt6msg), 2501 nla_data(nla), payloadlen)) 2502 goto nla_put_failure; 2503 2504 nlmsg_end(skb, nlh); 2505 2506 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE_R, NULL, GFP_ATOMIC); 2507 return; 2508 2509 nla_put_failure: 2510 nlmsg_cancel(skb, nlh); 2511 errout: 2512 kfree_skb(skb); 2513 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS); 2514 } 2515 2516 static const struct nla_policy ip6mr_getroute_policy[RTA_MAX + 1] = { 2517 [RTA_SRC] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 2518 [RTA_DST] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 2519 [RTA_TABLE] = { .type = NLA_U32 }, 2520 }; 2521 2522 static int ip6mr_rtm_valid_getroute_req(struct sk_buff *skb, 2523 const struct nlmsghdr *nlh, 2524 struct nlattr **tb, 2525 struct netlink_ext_ack *extack) 2526 { 2527 struct rtmsg *rtm; 2528 int err; 2529 2530 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, ip6mr_getroute_policy, 2531 extack); 2532 if (err) 2533 return err; 2534 2535 rtm = nlmsg_data(nlh); 2536 if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) || 2537 (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) || 2538 rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol || 2539 rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) { 2540 NL_SET_ERR_MSG_MOD(extack, 2541 "Invalid values in header for multicast route get request"); 2542 return -EINVAL; 2543 } 2544 2545 if ((tb[RTA_SRC] && !rtm->rtm_src_len) || 2546 (tb[RTA_DST] && !rtm->rtm_dst_len)) { 2547 NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6"); 2548 return -EINVAL; 2549 } 2550 2551 return 0; 2552 } 2553 2554 static int ip6mr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, 2555 struct netlink_ext_ack *extack) 2556 { 2557 struct net *net = sock_net(in_skb->sk); 2558 struct in6_addr src = {}, grp = {}; 2559 struct nlattr *tb[RTA_MAX + 1]; 2560 struct mfc6_cache *cache; 2561 struct mr_table *mrt; 2562 struct sk_buff *skb; 2563 u32 tableid; 2564 int err; 2565 2566 err = ip6mr_rtm_valid_getroute_req(in_skb, nlh, tb, extack); 2567 if (err < 0) 2568 return err; 2569 2570 if (tb[RTA_SRC]) 2571 src = nla_get_in6_addr(tb[RTA_SRC]); 2572 if (tb[RTA_DST]) 2573 grp = nla_get_in6_addr(tb[RTA_DST]); 2574 tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0; 2575 2576 mrt = ip6mr_get_table(net, tableid ?: RT_TABLE_DEFAULT); 2577 if (!mrt) { 2578 NL_SET_ERR_MSG_MOD(extack, "MR table does not exist"); 2579 return -ENOENT; 2580 } 2581 2582 /* entries are added/deleted only under RTNL */ 2583 rcu_read_lock(); 2584 cache = ip6mr_cache_find(mrt, &src, &grp); 2585 rcu_read_unlock(); 2586 if (!cache) { 2587 NL_SET_ERR_MSG_MOD(extack, "MR cache entry not found"); 2588 return -ENOENT; 2589 } 2590 2591 skb = nlmsg_new(mr6_msgsize(false, mrt->maxvif), GFP_KERNEL); 2592 if (!skb) 2593 return -ENOBUFS; 2594 2595 err = ip6mr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid, 2596 nlh->nlmsg_seq, cache, RTM_NEWROUTE, 0); 2597 if (err < 0) { 2598 kfree_skb(skb); 2599 return err; 2600 } 2601 2602 return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 2603 } 2604 2605 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) 2606 { 2607 const struct nlmsghdr *nlh = cb->nlh; 2608 struct fib_dump_filter filter = {}; 2609 int err; 2610 2611 if (cb->strict_check) { 2612 err = ip_valid_fib_dump_req(sock_net(skb->sk), nlh, 2613 &filter, cb); 2614 if (err < 0) 2615 return err; 2616 } 2617 2618 if (filter.table_id) { 2619 struct mr_table *mrt; 2620 2621 mrt = ip6mr_get_table(sock_net(skb->sk), filter.table_id); 2622 if (!mrt) { 2623 if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IP6MR) 2624 return skb->len; 2625 2626 NL_SET_ERR_MSG_MOD(cb->extack, "MR table does not exist"); 2627 return -ENOENT; 2628 } 2629 err = mr_table_dump(mrt, skb, cb, _ip6mr_fill_mroute, 2630 &mfc_unres_lock, &filter); 2631 return skb->len ? : err; 2632 } 2633 2634 return mr_rtm_dumproute(skb, cb, ip6mr_mr_table_iter, 2635 _ip6mr_fill_mroute, &mfc_unres_lock, &filter); 2636 } 2637