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 del_timer_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.tx_bytes += skb->len; 612 dev->stats.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.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 ip6_mr_forward(net, mrt, skb->dev, skb, c); 1033 } 1034 } 1035 1036 /* 1037 * Bounce a cache query up to pim6sd and netlink. 1038 * 1039 * Called under rcu_read_lock() 1040 */ 1041 1042 static int ip6mr_cache_report(const struct mr_table *mrt, struct sk_buff *pkt, 1043 mifi_t mifi, int assert) 1044 { 1045 struct sock *mroute6_sk; 1046 struct sk_buff *skb; 1047 struct mrt6msg *msg; 1048 int ret; 1049 1050 #ifdef CONFIG_IPV6_PIMSM_V2 1051 if (assert == MRT6MSG_WHOLEPKT || assert == MRT6MSG_WRMIFWHOLE) 1052 skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt) 1053 +sizeof(*msg)); 1054 else 1055 #endif 1056 skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC); 1057 1058 if (!skb) 1059 return -ENOBUFS; 1060 1061 /* I suppose that internal messages 1062 * do not require checksums */ 1063 1064 skb->ip_summed = CHECKSUM_UNNECESSARY; 1065 1066 #ifdef CONFIG_IPV6_PIMSM_V2 1067 if (assert == MRT6MSG_WHOLEPKT || assert == MRT6MSG_WRMIFWHOLE) { 1068 /* Ugly, but we have no choice with this interface. 1069 Duplicate old header, fix length etc. 1070 And all this only to mangle msg->im6_msgtype and 1071 to set msg->im6_mbz to "mbz" :-) 1072 */ 1073 skb_push(skb, -skb_network_offset(pkt)); 1074 1075 skb_push(skb, sizeof(*msg)); 1076 skb_reset_transport_header(skb); 1077 msg = (struct mrt6msg *)skb_transport_header(skb); 1078 msg->im6_mbz = 0; 1079 msg->im6_msgtype = assert; 1080 if (assert == MRT6MSG_WRMIFWHOLE) 1081 msg->im6_mif = mifi; 1082 else 1083 msg->im6_mif = READ_ONCE(mrt->mroute_reg_vif_num); 1084 msg->im6_pad = 0; 1085 msg->im6_src = ipv6_hdr(pkt)->saddr; 1086 msg->im6_dst = ipv6_hdr(pkt)->daddr; 1087 1088 skb->ip_summed = CHECKSUM_UNNECESSARY; 1089 } else 1090 #endif 1091 { 1092 /* 1093 * Copy the IP header 1094 */ 1095 1096 skb_put(skb, sizeof(struct ipv6hdr)); 1097 skb_reset_network_header(skb); 1098 skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr)); 1099 1100 /* 1101 * Add our header 1102 */ 1103 skb_put(skb, sizeof(*msg)); 1104 skb_reset_transport_header(skb); 1105 msg = (struct mrt6msg *)skb_transport_header(skb); 1106 1107 msg->im6_mbz = 0; 1108 msg->im6_msgtype = assert; 1109 msg->im6_mif = mifi; 1110 msg->im6_pad = 0; 1111 msg->im6_src = ipv6_hdr(pkt)->saddr; 1112 msg->im6_dst = ipv6_hdr(pkt)->daddr; 1113 1114 skb_dst_set(skb, dst_clone(skb_dst(pkt))); 1115 skb->ip_summed = CHECKSUM_UNNECESSARY; 1116 } 1117 1118 mroute6_sk = rcu_dereference(mrt->mroute_sk); 1119 if (!mroute6_sk) { 1120 kfree_skb(skb); 1121 return -EINVAL; 1122 } 1123 1124 mrt6msg_netlink_event(mrt, skb); 1125 1126 /* Deliver to user space multicast routing algorithms */ 1127 ret = sock_queue_rcv_skb(mroute6_sk, skb); 1128 1129 if (ret < 0) { 1130 net_warn_ratelimited("mroute6: pending queue full, dropping entries\n"); 1131 kfree_skb(skb); 1132 } 1133 1134 return ret; 1135 } 1136 1137 /* Queue a packet for resolution. It gets locked cache entry! */ 1138 static int ip6mr_cache_unresolved(struct mr_table *mrt, mifi_t mifi, 1139 struct sk_buff *skb, struct net_device *dev) 1140 { 1141 struct mfc6_cache *c; 1142 bool found = false; 1143 int err; 1144 1145 spin_lock_bh(&mfc_unres_lock); 1146 list_for_each_entry(c, &mrt->mfc_unres_queue, _c.list) { 1147 if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) && 1148 ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) { 1149 found = true; 1150 break; 1151 } 1152 } 1153 1154 if (!found) { 1155 /* 1156 * Create a new entry if allowable 1157 */ 1158 1159 c = ip6mr_cache_alloc_unres(); 1160 if (!c) { 1161 spin_unlock_bh(&mfc_unres_lock); 1162 1163 kfree_skb(skb); 1164 return -ENOBUFS; 1165 } 1166 1167 /* Fill in the new cache entry */ 1168 c->_c.mfc_parent = -1; 1169 c->mf6c_origin = ipv6_hdr(skb)->saddr; 1170 c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr; 1171 1172 /* 1173 * Reflect first query at pim6sd 1174 */ 1175 err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE); 1176 if (err < 0) { 1177 /* If the report failed throw the cache entry 1178 out - Brad Parker 1179 */ 1180 spin_unlock_bh(&mfc_unres_lock); 1181 1182 ip6mr_cache_free(c); 1183 kfree_skb(skb); 1184 return err; 1185 } 1186 1187 atomic_inc(&mrt->cache_resolve_queue_len); 1188 list_add(&c->_c.list, &mrt->mfc_unres_queue); 1189 mr6_netlink_event(mrt, c, RTM_NEWROUTE); 1190 1191 ipmr_do_expire_process(mrt); 1192 } 1193 1194 /* See if we can append the packet */ 1195 if (c->_c.mfc_un.unres.unresolved.qlen > 3) { 1196 kfree_skb(skb); 1197 err = -ENOBUFS; 1198 } else { 1199 if (dev) { 1200 skb->dev = dev; 1201 skb->skb_iif = dev->ifindex; 1202 } 1203 skb_queue_tail(&c->_c.mfc_un.unres.unresolved, skb); 1204 err = 0; 1205 } 1206 1207 spin_unlock_bh(&mfc_unres_lock); 1208 return err; 1209 } 1210 1211 /* 1212 * MFC6 cache manipulation by user space 1213 */ 1214 1215 static int ip6mr_mfc_delete(struct mr_table *mrt, struct mf6cctl *mfc, 1216 int parent) 1217 { 1218 struct mfc6_cache *c; 1219 1220 /* The entries are added/deleted only under RTNL */ 1221 rcu_read_lock(); 1222 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr, 1223 &mfc->mf6cc_mcastgrp.sin6_addr, parent); 1224 rcu_read_unlock(); 1225 if (!c) 1226 return -ENOENT; 1227 rhltable_remove(&mrt->mfc_hash, &c->_c.mnode, ip6mr_rht_params); 1228 list_del_rcu(&c->_c.list); 1229 1230 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net), 1231 FIB_EVENT_ENTRY_DEL, c, mrt->id); 1232 mr6_netlink_event(mrt, c, RTM_DELROUTE); 1233 mr_cache_put(&c->_c); 1234 return 0; 1235 } 1236 1237 static int ip6mr_device_event(struct notifier_block *this, 1238 unsigned long event, void *ptr) 1239 { 1240 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1241 struct net *net = dev_net(dev); 1242 struct mr_table *mrt; 1243 struct vif_device *v; 1244 int ct; 1245 1246 if (event != NETDEV_UNREGISTER) 1247 return NOTIFY_DONE; 1248 1249 ip6mr_for_each_table(mrt, net) { 1250 v = &mrt->vif_table[0]; 1251 for (ct = 0; ct < mrt->maxvif; ct++, v++) { 1252 if (rcu_access_pointer(v->dev) == dev) 1253 mif6_delete(mrt, ct, 1, NULL); 1254 } 1255 } 1256 1257 return NOTIFY_DONE; 1258 } 1259 1260 static unsigned int ip6mr_seq_read(struct net *net) 1261 { 1262 ASSERT_RTNL(); 1263 1264 return net->ipv6.ipmr_seq + ip6mr_rules_seq_read(net); 1265 } 1266 1267 static int ip6mr_dump(struct net *net, struct notifier_block *nb, 1268 struct netlink_ext_ack *extack) 1269 { 1270 return mr_dump(net, nb, RTNL_FAMILY_IP6MR, ip6mr_rules_dump, 1271 ip6mr_mr_table_iter, extack); 1272 } 1273 1274 static struct notifier_block ip6_mr_notifier = { 1275 .notifier_call = ip6mr_device_event 1276 }; 1277 1278 static const struct fib_notifier_ops ip6mr_notifier_ops_template = { 1279 .family = RTNL_FAMILY_IP6MR, 1280 .fib_seq_read = ip6mr_seq_read, 1281 .fib_dump = ip6mr_dump, 1282 .owner = THIS_MODULE, 1283 }; 1284 1285 static int __net_init ip6mr_notifier_init(struct net *net) 1286 { 1287 struct fib_notifier_ops *ops; 1288 1289 net->ipv6.ipmr_seq = 0; 1290 1291 ops = fib_notifier_ops_register(&ip6mr_notifier_ops_template, net); 1292 if (IS_ERR(ops)) 1293 return PTR_ERR(ops); 1294 1295 net->ipv6.ip6mr_notifier_ops = ops; 1296 1297 return 0; 1298 } 1299 1300 static void __net_exit ip6mr_notifier_exit(struct net *net) 1301 { 1302 fib_notifier_ops_unregister(net->ipv6.ip6mr_notifier_ops); 1303 net->ipv6.ip6mr_notifier_ops = NULL; 1304 } 1305 1306 /* Setup for IP multicast routing */ 1307 static int __net_init ip6mr_net_init(struct net *net) 1308 { 1309 int err; 1310 1311 err = ip6mr_notifier_init(net); 1312 if (err) 1313 return err; 1314 1315 err = ip6mr_rules_init(net); 1316 if (err < 0) 1317 goto ip6mr_rules_fail; 1318 1319 #ifdef CONFIG_PROC_FS 1320 err = -ENOMEM; 1321 if (!proc_create_net("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_seq_ops, 1322 sizeof(struct mr_vif_iter))) 1323 goto proc_vif_fail; 1324 if (!proc_create_net("ip6_mr_cache", 0, net->proc_net, &ipmr_mfc_seq_ops, 1325 sizeof(struct mr_mfc_iter))) 1326 goto proc_cache_fail; 1327 #endif 1328 1329 return 0; 1330 1331 #ifdef CONFIG_PROC_FS 1332 proc_cache_fail: 1333 remove_proc_entry("ip6_mr_vif", net->proc_net); 1334 proc_vif_fail: 1335 rtnl_lock(); 1336 ip6mr_rules_exit(net); 1337 rtnl_unlock(); 1338 #endif 1339 ip6mr_rules_fail: 1340 ip6mr_notifier_exit(net); 1341 return err; 1342 } 1343 1344 static void __net_exit ip6mr_net_exit(struct net *net) 1345 { 1346 #ifdef CONFIG_PROC_FS 1347 remove_proc_entry("ip6_mr_cache", net->proc_net); 1348 remove_proc_entry("ip6_mr_vif", net->proc_net); 1349 #endif 1350 ip6mr_notifier_exit(net); 1351 } 1352 1353 static void __net_exit ip6mr_net_exit_batch(struct list_head *net_list) 1354 { 1355 struct net *net; 1356 1357 rtnl_lock(); 1358 list_for_each_entry(net, net_list, exit_list) 1359 ip6mr_rules_exit(net); 1360 rtnl_unlock(); 1361 } 1362 1363 static struct pernet_operations ip6mr_net_ops = { 1364 .init = ip6mr_net_init, 1365 .exit = ip6mr_net_exit, 1366 .exit_batch = ip6mr_net_exit_batch, 1367 }; 1368 1369 int __init ip6_mr_init(void) 1370 { 1371 int err; 1372 1373 mrt_cachep = kmem_cache_create("ip6_mrt_cache", 1374 sizeof(struct mfc6_cache), 1375 0, SLAB_HWCACHE_ALIGN, 1376 NULL); 1377 if (!mrt_cachep) 1378 return -ENOMEM; 1379 1380 err = register_pernet_subsys(&ip6mr_net_ops); 1381 if (err) 1382 goto reg_pernet_fail; 1383 1384 err = register_netdevice_notifier(&ip6_mr_notifier); 1385 if (err) 1386 goto reg_notif_fail; 1387 #ifdef CONFIG_IPV6_PIMSM_V2 1388 if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) { 1389 pr_err("%s: can't add PIM protocol\n", __func__); 1390 err = -EAGAIN; 1391 goto add_proto_fail; 1392 } 1393 #endif 1394 err = rtnl_register_module(THIS_MODULE, RTNL_FAMILY_IP6MR, RTM_GETROUTE, 1395 ip6mr_rtm_getroute, ip6mr_rtm_dumproute, 0); 1396 if (err == 0) 1397 return 0; 1398 1399 #ifdef CONFIG_IPV6_PIMSM_V2 1400 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM); 1401 add_proto_fail: 1402 unregister_netdevice_notifier(&ip6_mr_notifier); 1403 #endif 1404 reg_notif_fail: 1405 unregister_pernet_subsys(&ip6mr_net_ops); 1406 reg_pernet_fail: 1407 kmem_cache_destroy(mrt_cachep); 1408 return err; 1409 } 1410 1411 void ip6_mr_cleanup(void) 1412 { 1413 rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE); 1414 #ifdef CONFIG_IPV6_PIMSM_V2 1415 inet6_del_protocol(&pim6_protocol, IPPROTO_PIM); 1416 #endif 1417 unregister_netdevice_notifier(&ip6_mr_notifier); 1418 unregister_pernet_subsys(&ip6mr_net_ops); 1419 kmem_cache_destroy(mrt_cachep); 1420 } 1421 1422 static int ip6mr_mfc_add(struct net *net, struct mr_table *mrt, 1423 struct mf6cctl *mfc, int mrtsock, int parent) 1424 { 1425 unsigned char ttls[MAXMIFS]; 1426 struct mfc6_cache *uc, *c; 1427 struct mr_mfc *_uc; 1428 bool found; 1429 int i, err; 1430 1431 if (mfc->mf6cc_parent >= MAXMIFS) 1432 return -ENFILE; 1433 1434 memset(ttls, 255, MAXMIFS); 1435 for (i = 0; i < MAXMIFS; i++) { 1436 if (IF_ISSET(i, &mfc->mf6cc_ifset)) 1437 ttls[i] = 1; 1438 } 1439 1440 /* The entries are added/deleted only under RTNL */ 1441 rcu_read_lock(); 1442 c = ip6mr_cache_find_parent(mrt, &mfc->mf6cc_origin.sin6_addr, 1443 &mfc->mf6cc_mcastgrp.sin6_addr, parent); 1444 rcu_read_unlock(); 1445 if (c) { 1446 spin_lock(&mrt_lock); 1447 c->_c.mfc_parent = mfc->mf6cc_parent; 1448 ip6mr_update_thresholds(mrt, &c->_c, ttls); 1449 if (!mrtsock) 1450 c->_c.mfc_flags |= MFC_STATIC; 1451 spin_unlock(&mrt_lock); 1452 call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, 1453 c, mrt->id); 1454 mr6_netlink_event(mrt, c, RTM_NEWROUTE); 1455 return 0; 1456 } 1457 1458 if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) && 1459 !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr)) 1460 return -EINVAL; 1461 1462 c = ip6mr_cache_alloc(); 1463 if (!c) 1464 return -ENOMEM; 1465 1466 c->mf6c_origin = mfc->mf6cc_origin.sin6_addr; 1467 c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr; 1468 c->_c.mfc_parent = mfc->mf6cc_parent; 1469 ip6mr_update_thresholds(mrt, &c->_c, ttls); 1470 if (!mrtsock) 1471 c->_c.mfc_flags |= MFC_STATIC; 1472 1473 err = rhltable_insert_key(&mrt->mfc_hash, &c->cmparg, &c->_c.mnode, 1474 ip6mr_rht_params); 1475 if (err) { 1476 pr_err("ip6mr: rhtable insert error %d\n", err); 1477 ip6mr_cache_free(c); 1478 return err; 1479 } 1480 list_add_tail_rcu(&c->_c.list, &mrt->mfc_cache_list); 1481 1482 /* Check to see if we resolved a queued list. If so we 1483 * need to send on the frames and tidy up. 1484 */ 1485 found = false; 1486 spin_lock_bh(&mfc_unres_lock); 1487 list_for_each_entry(_uc, &mrt->mfc_unres_queue, list) { 1488 uc = (struct mfc6_cache *)_uc; 1489 if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) && 1490 ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) { 1491 list_del(&_uc->list); 1492 atomic_dec(&mrt->cache_resolve_queue_len); 1493 found = true; 1494 break; 1495 } 1496 } 1497 if (list_empty(&mrt->mfc_unres_queue)) 1498 del_timer(&mrt->ipmr_expire_timer); 1499 spin_unlock_bh(&mfc_unres_lock); 1500 1501 if (found) { 1502 ip6mr_cache_resolve(net, mrt, uc, c); 1503 ip6mr_cache_free(uc); 1504 } 1505 call_ip6mr_mfc_entry_notifiers(net, FIB_EVENT_ENTRY_ADD, 1506 c, mrt->id); 1507 mr6_netlink_event(mrt, c, RTM_NEWROUTE); 1508 return 0; 1509 } 1510 1511 /* 1512 * Close the multicast socket, and clear the vif tables etc 1513 */ 1514 1515 static void mroute_clean_tables(struct mr_table *mrt, int flags) 1516 { 1517 struct mr_mfc *c, *tmp; 1518 LIST_HEAD(list); 1519 int i; 1520 1521 /* Shut down all active vif entries */ 1522 if (flags & (MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC)) { 1523 for (i = 0; i < mrt->maxvif; i++) { 1524 if (((mrt->vif_table[i].flags & VIFF_STATIC) && 1525 !(flags & MRT6_FLUSH_MIFS_STATIC)) || 1526 (!(mrt->vif_table[i].flags & VIFF_STATIC) && !(flags & MRT6_FLUSH_MIFS))) 1527 continue; 1528 mif6_delete(mrt, i, 0, &list); 1529 } 1530 unregister_netdevice_many(&list); 1531 } 1532 1533 /* Wipe the cache */ 1534 if (flags & (MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC)) { 1535 list_for_each_entry_safe(c, tmp, &mrt->mfc_cache_list, list) { 1536 if (((c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC_STATIC)) || 1537 (!(c->mfc_flags & MFC_STATIC) && !(flags & MRT6_FLUSH_MFC))) 1538 continue; 1539 rhltable_remove(&mrt->mfc_hash, &c->mnode, ip6mr_rht_params); 1540 list_del_rcu(&c->list); 1541 call_ip6mr_mfc_entry_notifiers(read_pnet(&mrt->net), 1542 FIB_EVENT_ENTRY_DEL, 1543 (struct mfc6_cache *)c, mrt->id); 1544 mr6_netlink_event(mrt, (struct mfc6_cache *)c, RTM_DELROUTE); 1545 mr_cache_put(c); 1546 } 1547 } 1548 1549 if (flags & MRT6_FLUSH_MFC) { 1550 if (atomic_read(&mrt->cache_resolve_queue_len) != 0) { 1551 spin_lock_bh(&mfc_unres_lock); 1552 list_for_each_entry_safe(c, tmp, &mrt->mfc_unres_queue, list) { 1553 list_del(&c->list); 1554 mr6_netlink_event(mrt, (struct mfc6_cache *)c, 1555 RTM_DELROUTE); 1556 ip6mr_destroy_unres(mrt, (struct mfc6_cache *)c); 1557 } 1558 spin_unlock_bh(&mfc_unres_lock); 1559 } 1560 } 1561 } 1562 1563 static int ip6mr_sk_init(struct mr_table *mrt, struct sock *sk) 1564 { 1565 int err = 0; 1566 struct net *net = sock_net(sk); 1567 1568 rtnl_lock(); 1569 spin_lock(&mrt_lock); 1570 if (rtnl_dereference(mrt->mroute_sk)) { 1571 err = -EADDRINUSE; 1572 } else { 1573 rcu_assign_pointer(mrt->mroute_sk, sk); 1574 sock_set_flag(sk, SOCK_RCU_FREE); 1575 atomic_inc(&net->ipv6.devconf_all->mc_forwarding); 1576 } 1577 spin_unlock(&mrt_lock); 1578 1579 if (!err) 1580 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 1581 NETCONFA_MC_FORWARDING, 1582 NETCONFA_IFINDEX_ALL, 1583 net->ipv6.devconf_all); 1584 rtnl_unlock(); 1585 1586 return err; 1587 } 1588 1589 int ip6mr_sk_done(struct sock *sk) 1590 { 1591 struct net *net = sock_net(sk); 1592 struct ipv6_devconf *devconf; 1593 struct mr_table *mrt; 1594 int err = -EACCES; 1595 1596 if (sk->sk_type != SOCK_RAW || 1597 inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1598 return err; 1599 1600 devconf = net->ipv6.devconf_all; 1601 if (!devconf || !atomic_read(&devconf->mc_forwarding)) 1602 return err; 1603 1604 rtnl_lock(); 1605 ip6mr_for_each_table(mrt, net) { 1606 if (sk == rtnl_dereference(mrt->mroute_sk)) { 1607 spin_lock(&mrt_lock); 1608 RCU_INIT_POINTER(mrt->mroute_sk, NULL); 1609 /* Note that mroute_sk had SOCK_RCU_FREE set, 1610 * so the RCU grace period before sk freeing 1611 * is guaranteed by sk_destruct() 1612 */ 1613 atomic_dec(&devconf->mc_forwarding); 1614 spin_unlock(&mrt_lock); 1615 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 1616 NETCONFA_MC_FORWARDING, 1617 NETCONFA_IFINDEX_ALL, 1618 net->ipv6.devconf_all); 1619 1620 mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MFC); 1621 err = 0; 1622 break; 1623 } 1624 } 1625 rtnl_unlock(); 1626 1627 return err; 1628 } 1629 1630 bool mroute6_is_socket(struct net *net, struct sk_buff *skb) 1631 { 1632 struct mr_table *mrt; 1633 struct flowi6 fl6 = { 1634 .flowi6_iif = skb->skb_iif ? : LOOPBACK_IFINDEX, 1635 .flowi6_oif = skb->dev->ifindex, 1636 .flowi6_mark = skb->mark, 1637 }; 1638 1639 if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0) 1640 return NULL; 1641 1642 return rcu_access_pointer(mrt->mroute_sk); 1643 } 1644 EXPORT_SYMBOL(mroute6_is_socket); 1645 1646 /* 1647 * Socket options and virtual interface manipulation. The whole 1648 * virtual interface system is a complete heap, but unfortunately 1649 * that's how BSD mrouted happens to think. Maybe one day with a proper 1650 * MOSPF/PIM router set up we can clean this up. 1651 */ 1652 1653 int ip6_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval, 1654 unsigned int optlen) 1655 { 1656 int ret, parent = 0; 1657 struct mif6ctl vif; 1658 struct mf6cctl mfc; 1659 mifi_t mifi; 1660 struct net *net = sock_net(sk); 1661 struct mr_table *mrt; 1662 1663 if (sk->sk_type != SOCK_RAW || 1664 inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1665 return -EOPNOTSUPP; 1666 1667 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1668 if (!mrt) 1669 return -ENOENT; 1670 1671 if (optname != MRT6_INIT) { 1672 if (sk != rcu_access_pointer(mrt->mroute_sk) && 1673 !ns_capable(net->user_ns, CAP_NET_ADMIN)) 1674 return -EACCES; 1675 } 1676 1677 switch (optname) { 1678 case MRT6_INIT: 1679 if (optlen < sizeof(int)) 1680 return -EINVAL; 1681 1682 return ip6mr_sk_init(mrt, sk); 1683 1684 case MRT6_DONE: 1685 return ip6mr_sk_done(sk); 1686 1687 case MRT6_ADD_MIF: 1688 if (optlen < sizeof(vif)) 1689 return -EINVAL; 1690 if (copy_from_sockptr(&vif, optval, sizeof(vif))) 1691 return -EFAULT; 1692 if (vif.mif6c_mifi >= MAXMIFS) 1693 return -ENFILE; 1694 rtnl_lock(); 1695 ret = mif6_add(net, mrt, &vif, 1696 sk == rtnl_dereference(mrt->mroute_sk)); 1697 rtnl_unlock(); 1698 return ret; 1699 1700 case MRT6_DEL_MIF: 1701 if (optlen < sizeof(mifi_t)) 1702 return -EINVAL; 1703 if (copy_from_sockptr(&mifi, optval, sizeof(mifi_t))) 1704 return -EFAULT; 1705 rtnl_lock(); 1706 ret = mif6_delete(mrt, mifi, 0, NULL); 1707 rtnl_unlock(); 1708 return ret; 1709 1710 /* 1711 * Manipulate the forwarding caches. These live 1712 * in a sort of kernel/user symbiosis. 1713 */ 1714 case MRT6_ADD_MFC: 1715 case MRT6_DEL_MFC: 1716 parent = -1; 1717 fallthrough; 1718 case MRT6_ADD_MFC_PROXY: 1719 case MRT6_DEL_MFC_PROXY: 1720 if (optlen < sizeof(mfc)) 1721 return -EINVAL; 1722 if (copy_from_sockptr(&mfc, optval, sizeof(mfc))) 1723 return -EFAULT; 1724 if (parent == 0) 1725 parent = mfc.mf6cc_parent; 1726 rtnl_lock(); 1727 if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY) 1728 ret = ip6mr_mfc_delete(mrt, &mfc, parent); 1729 else 1730 ret = ip6mr_mfc_add(net, mrt, &mfc, 1731 sk == 1732 rtnl_dereference(mrt->mroute_sk), 1733 parent); 1734 rtnl_unlock(); 1735 return ret; 1736 1737 case MRT6_FLUSH: 1738 { 1739 int flags; 1740 1741 if (optlen != sizeof(flags)) 1742 return -EINVAL; 1743 if (copy_from_sockptr(&flags, optval, sizeof(flags))) 1744 return -EFAULT; 1745 rtnl_lock(); 1746 mroute_clean_tables(mrt, flags); 1747 rtnl_unlock(); 1748 return 0; 1749 } 1750 1751 /* 1752 * Control PIM assert (to activate pim will activate assert) 1753 */ 1754 case MRT6_ASSERT: 1755 { 1756 int v; 1757 1758 if (optlen != sizeof(v)) 1759 return -EINVAL; 1760 if (copy_from_sockptr(&v, optval, sizeof(v))) 1761 return -EFAULT; 1762 mrt->mroute_do_assert = v; 1763 return 0; 1764 } 1765 1766 #ifdef CONFIG_IPV6_PIMSM_V2 1767 case MRT6_PIM: 1768 { 1769 bool do_wrmifwhole; 1770 int v; 1771 1772 if (optlen != sizeof(v)) 1773 return -EINVAL; 1774 if (copy_from_sockptr(&v, optval, sizeof(v))) 1775 return -EFAULT; 1776 1777 do_wrmifwhole = (v == MRT6MSG_WRMIFWHOLE); 1778 v = !!v; 1779 rtnl_lock(); 1780 ret = 0; 1781 if (v != mrt->mroute_do_pim) { 1782 mrt->mroute_do_pim = v; 1783 mrt->mroute_do_assert = v; 1784 mrt->mroute_do_wrvifwhole = do_wrmifwhole; 1785 } 1786 rtnl_unlock(); 1787 return ret; 1788 } 1789 1790 #endif 1791 #ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES 1792 case MRT6_TABLE: 1793 { 1794 u32 v; 1795 1796 if (optlen != sizeof(u32)) 1797 return -EINVAL; 1798 if (copy_from_sockptr(&v, optval, sizeof(v))) 1799 return -EFAULT; 1800 /* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */ 1801 if (v != RT_TABLE_DEFAULT && v >= 100000000) 1802 return -EINVAL; 1803 if (sk == rcu_access_pointer(mrt->mroute_sk)) 1804 return -EBUSY; 1805 1806 rtnl_lock(); 1807 ret = 0; 1808 mrt = ip6mr_new_table(net, v); 1809 if (IS_ERR(mrt)) 1810 ret = PTR_ERR(mrt); 1811 else 1812 raw6_sk(sk)->ip6mr_table = v; 1813 rtnl_unlock(); 1814 return ret; 1815 } 1816 #endif 1817 /* 1818 * Spurious command, or MRT6_VERSION which you cannot 1819 * set. 1820 */ 1821 default: 1822 return -ENOPROTOOPT; 1823 } 1824 } 1825 1826 /* 1827 * Getsock opt support for the multicast routing system. 1828 */ 1829 1830 int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval, 1831 int __user *optlen) 1832 { 1833 int olr; 1834 int val; 1835 struct net *net = sock_net(sk); 1836 struct mr_table *mrt; 1837 1838 if (sk->sk_type != SOCK_RAW || 1839 inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1840 return -EOPNOTSUPP; 1841 1842 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1843 if (!mrt) 1844 return -ENOENT; 1845 1846 switch (optname) { 1847 case MRT6_VERSION: 1848 val = 0x0305; 1849 break; 1850 #ifdef CONFIG_IPV6_PIMSM_V2 1851 case MRT6_PIM: 1852 val = mrt->mroute_do_pim; 1853 break; 1854 #endif 1855 case MRT6_ASSERT: 1856 val = mrt->mroute_do_assert; 1857 break; 1858 default: 1859 return -ENOPROTOOPT; 1860 } 1861 1862 if (get_user(olr, optlen)) 1863 return -EFAULT; 1864 1865 olr = min_t(int, olr, sizeof(int)); 1866 if (olr < 0) 1867 return -EINVAL; 1868 1869 if (put_user(olr, optlen)) 1870 return -EFAULT; 1871 if (copy_to_user(optval, &val, olr)) 1872 return -EFAULT; 1873 return 0; 1874 } 1875 1876 /* 1877 * The IP multicast ioctl support routines. 1878 */ 1879 1880 int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg) 1881 { 1882 struct sioc_sg_req6 sr; 1883 struct sioc_mif_req6 vr; 1884 struct vif_device *vif; 1885 struct mfc6_cache *c; 1886 struct net *net = sock_net(sk); 1887 struct mr_table *mrt; 1888 1889 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1890 if (!mrt) 1891 return -ENOENT; 1892 1893 switch (cmd) { 1894 case SIOCGETMIFCNT_IN6: 1895 if (copy_from_user(&vr, arg, sizeof(vr))) 1896 return -EFAULT; 1897 if (vr.mifi >= mrt->maxvif) 1898 return -EINVAL; 1899 vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif); 1900 rcu_read_lock(); 1901 vif = &mrt->vif_table[vr.mifi]; 1902 if (VIF_EXISTS(mrt, vr.mifi)) { 1903 vr.icount = READ_ONCE(vif->pkt_in); 1904 vr.ocount = READ_ONCE(vif->pkt_out); 1905 vr.ibytes = READ_ONCE(vif->bytes_in); 1906 vr.obytes = READ_ONCE(vif->bytes_out); 1907 rcu_read_unlock(); 1908 1909 if (copy_to_user(arg, &vr, sizeof(vr))) 1910 return -EFAULT; 1911 return 0; 1912 } 1913 rcu_read_unlock(); 1914 return -EADDRNOTAVAIL; 1915 case SIOCGETSGCNT_IN6: 1916 if (copy_from_user(&sr, arg, sizeof(sr))) 1917 return -EFAULT; 1918 1919 rcu_read_lock(); 1920 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); 1921 if (c) { 1922 sr.pktcnt = c->_c.mfc_un.res.pkt; 1923 sr.bytecnt = c->_c.mfc_un.res.bytes; 1924 sr.wrong_if = c->_c.mfc_un.res.wrong_if; 1925 rcu_read_unlock(); 1926 1927 if (copy_to_user(arg, &sr, sizeof(sr))) 1928 return -EFAULT; 1929 return 0; 1930 } 1931 rcu_read_unlock(); 1932 return -EADDRNOTAVAIL; 1933 default: 1934 return -ENOIOCTLCMD; 1935 } 1936 } 1937 1938 #ifdef CONFIG_COMPAT 1939 struct compat_sioc_sg_req6 { 1940 struct sockaddr_in6 src; 1941 struct sockaddr_in6 grp; 1942 compat_ulong_t pktcnt; 1943 compat_ulong_t bytecnt; 1944 compat_ulong_t wrong_if; 1945 }; 1946 1947 struct compat_sioc_mif_req6 { 1948 mifi_t mifi; 1949 compat_ulong_t icount; 1950 compat_ulong_t ocount; 1951 compat_ulong_t ibytes; 1952 compat_ulong_t obytes; 1953 }; 1954 1955 int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg) 1956 { 1957 struct compat_sioc_sg_req6 sr; 1958 struct compat_sioc_mif_req6 vr; 1959 struct vif_device *vif; 1960 struct mfc6_cache *c; 1961 struct net *net = sock_net(sk); 1962 struct mr_table *mrt; 1963 1964 mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT); 1965 if (!mrt) 1966 return -ENOENT; 1967 1968 switch (cmd) { 1969 case SIOCGETMIFCNT_IN6: 1970 if (copy_from_user(&vr, arg, sizeof(vr))) 1971 return -EFAULT; 1972 if (vr.mifi >= mrt->maxvif) 1973 return -EINVAL; 1974 vr.mifi = array_index_nospec(vr.mifi, mrt->maxvif); 1975 rcu_read_lock(); 1976 vif = &mrt->vif_table[vr.mifi]; 1977 if (VIF_EXISTS(mrt, vr.mifi)) { 1978 vr.icount = READ_ONCE(vif->pkt_in); 1979 vr.ocount = READ_ONCE(vif->pkt_out); 1980 vr.ibytes = READ_ONCE(vif->bytes_in); 1981 vr.obytes = READ_ONCE(vif->bytes_out); 1982 rcu_read_unlock(); 1983 1984 if (copy_to_user(arg, &vr, sizeof(vr))) 1985 return -EFAULT; 1986 return 0; 1987 } 1988 rcu_read_unlock(); 1989 return -EADDRNOTAVAIL; 1990 case SIOCGETSGCNT_IN6: 1991 if (copy_from_user(&sr, arg, sizeof(sr))) 1992 return -EFAULT; 1993 1994 rcu_read_lock(); 1995 c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr); 1996 if (c) { 1997 sr.pktcnt = c->_c.mfc_un.res.pkt; 1998 sr.bytecnt = c->_c.mfc_un.res.bytes; 1999 sr.wrong_if = c->_c.mfc_un.res.wrong_if; 2000 rcu_read_unlock(); 2001 2002 if (copy_to_user(arg, &sr, sizeof(sr))) 2003 return -EFAULT; 2004 return 0; 2005 } 2006 rcu_read_unlock(); 2007 return -EADDRNOTAVAIL; 2008 default: 2009 return -ENOIOCTLCMD; 2010 } 2011 } 2012 #endif 2013 2014 static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct sk_buff *skb) 2015 { 2016 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), 2017 IPSTATS_MIB_OUTFORWDATAGRAMS); 2018 IP6_ADD_STATS(net, ip6_dst_idev(skb_dst(skb)), 2019 IPSTATS_MIB_OUTOCTETS, skb->len); 2020 return dst_output(net, sk, skb); 2021 } 2022 2023 /* 2024 * Processing handlers for ip6mr_forward 2025 */ 2026 2027 static int ip6mr_forward2(struct net *net, struct mr_table *mrt, 2028 struct sk_buff *skb, int vifi) 2029 { 2030 struct vif_device *vif = &mrt->vif_table[vifi]; 2031 struct net_device *vif_dev; 2032 struct ipv6hdr *ipv6h; 2033 struct dst_entry *dst; 2034 struct flowi6 fl6; 2035 2036 vif_dev = vif_dev_read(vif); 2037 if (!vif_dev) 2038 goto out_free; 2039 2040 #ifdef CONFIG_IPV6_PIMSM_V2 2041 if (vif->flags & MIFF_REGISTER) { 2042 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1); 2043 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len); 2044 vif_dev->stats.tx_bytes += skb->len; 2045 vif_dev->stats.tx_packets++; 2046 ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT); 2047 goto out_free; 2048 } 2049 #endif 2050 2051 ipv6h = ipv6_hdr(skb); 2052 2053 fl6 = (struct flowi6) { 2054 .flowi6_oif = vif->link, 2055 .daddr = ipv6h->daddr, 2056 }; 2057 2058 dst = ip6_route_output(net, NULL, &fl6); 2059 if (dst->error) { 2060 dst_release(dst); 2061 goto out_free; 2062 } 2063 2064 skb_dst_drop(skb); 2065 skb_dst_set(skb, dst); 2066 2067 /* 2068 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally 2069 * not only before forwarding, but after forwarding on all output 2070 * interfaces. It is clear, if mrouter runs a multicasting 2071 * program, it should receive packets not depending to what interface 2072 * program is joined. 2073 * If we will not make it, the program will have to join on all 2074 * interfaces. On the other hand, multihoming host (or router, but 2075 * not mrouter) cannot join to more than one interface - it will 2076 * result in receiving multiple packets. 2077 */ 2078 skb->dev = vif_dev; 2079 WRITE_ONCE(vif->pkt_out, vif->pkt_out + 1); 2080 WRITE_ONCE(vif->bytes_out, vif->bytes_out + skb->len); 2081 2082 /* We are about to write */ 2083 /* XXX: extension headers? */ 2084 if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(vif_dev))) 2085 goto out_free; 2086 2087 ipv6h = ipv6_hdr(skb); 2088 ipv6h->hop_limit--; 2089 2090 IP6CB(skb)->flags |= IP6SKB_FORWARDED; 2091 2092 return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, 2093 net, NULL, skb, skb->dev, vif_dev, 2094 ip6mr_forward2_finish); 2095 2096 out_free: 2097 kfree_skb(skb); 2098 return 0; 2099 } 2100 2101 /* Called with rcu_read_lock() */ 2102 static int ip6mr_find_vif(struct mr_table *mrt, struct net_device *dev) 2103 { 2104 int ct; 2105 2106 /* Pairs with WRITE_ONCE() in mif6_delete()/mif6_add() */ 2107 for (ct = READ_ONCE(mrt->maxvif) - 1; ct >= 0; ct--) { 2108 if (rcu_access_pointer(mrt->vif_table[ct].dev) == dev) 2109 break; 2110 } 2111 return ct; 2112 } 2113 2114 /* Called under rcu_read_lock() */ 2115 static void ip6_mr_forward(struct net *net, struct mr_table *mrt, 2116 struct net_device *dev, struct sk_buff *skb, 2117 struct mfc6_cache *c) 2118 { 2119 int psend = -1; 2120 int vif, ct; 2121 int true_vifi = ip6mr_find_vif(mrt, dev); 2122 2123 vif = c->_c.mfc_parent; 2124 c->_c.mfc_un.res.pkt++; 2125 c->_c.mfc_un.res.bytes += skb->len; 2126 c->_c.mfc_un.res.lastuse = jiffies; 2127 2128 if (ipv6_addr_any(&c->mf6c_origin) && true_vifi >= 0) { 2129 struct mfc6_cache *cache_proxy; 2130 2131 /* For an (*,G) entry, we only check that the incoming 2132 * interface is part of the static tree. 2133 */ 2134 cache_proxy = mr_mfc_find_any_parent(mrt, vif); 2135 if (cache_proxy && 2136 cache_proxy->_c.mfc_un.res.ttls[true_vifi] < 255) 2137 goto forward; 2138 } 2139 2140 /* 2141 * Wrong interface: drop packet and (maybe) send PIM assert. 2142 */ 2143 if (rcu_access_pointer(mrt->vif_table[vif].dev) != dev) { 2144 c->_c.mfc_un.res.wrong_if++; 2145 2146 if (true_vifi >= 0 && mrt->mroute_do_assert && 2147 /* pimsm uses asserts, when switching from RPT to SPT, 2148 so that we cannot check that packet arrived on an oif. 2149 It is bad, but otherwise we would need to move pretty 2150 large chunk of pimd to kernel. Ough... --ANK 2151 */ 2152 (mrt->mroute_do_pim || 2153 c->_c.mfc_un.res.ttls[true_vifi] < 255) && 2154 time_after(jiffies, 2155 c->_c.mfc_un.res.last_assert + 2156 MFC_ASSERT_THRESH)) { 2157 c->_c.mfc_un.res.last_assert = jiffies; 2158 ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF); 2159 if (mrt->mroute_do_wrvifwhole) 2160 ip6mr_cache_report(mrt, skb, true_vifi, 2161 MRT6MSG_WRMIFWHOLE); 2162 } 2163 goto dont_forward; 2164 } 2165 2166 forward: 2167 WRITE_ONCE(mrt->vif_table[vif].pkt_in, 2168 mrt->vif_table[vif].pkt_in + 1); 2169 WRITE_ONCE(mrt->vif_table[vif].bytes_in, 2170 mrt->vif_table[vif].bytes_in + skb->len); 2171 2172 /* 2173 * Forward the frame 2174 */ 2175 if (ipv6_addr_any(&c->mf6c_origin) && 2176 ipv6_addr_any(&c->mf6c_mcastgrp)) { 2177 if (true_vifi >= 0 && 2178 true_vifi != c->_c.mfc_parent && 2179 ipv6_hdr(skb)->hop_limit > 2180 c->_c.mfc_un.res.ttls[c->_c.mfc_parent]) { 2181 /* It's an (*,*) entry and the packet is not coming from 2182 * the upstream: forward the packet to the upstream 2183 * only. 2184 */ 2185 psend = c->_c.mfc_parent; 2186 goto last_forward; 2187 } 2188 goto dont_forward; 2189 } 2190 for (ct = c->_c.mfc_un.res.maxvif - 1; 2191 ct >= c->_c.mfc_un.res.minvif; ct--) { 2192 /* For (*,G) entry, don't forward to the incoming interface */ 2193 if ((!ipv6_addr_any(&c->mf6c_origin) || ct != true_vifi) && 2194 ipv6_hdr(skb)->hop_limit > c->_c.mfc_un.res.ttls[ct]) { 2195 if (psend != -1) { 2196 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 2197 if (skb2) 2198 ip6mr_forward2(net, mrt, skb2, psend); 2199 } 2200 psend = ct; 2201 } 2202 } 2203 last_forward: 2204 if (psend != -1) { 2205 ip6mr_forward2(net, mrt, skb, psend); 2206 return; 2207 } 2208 2209 dont_forward: 2210 kfree_skb(skb); 2211 } 2212 2213 2214 /* 2215 * Multicast packets for forwarding arrive here 2216 */ 2217 2218 int ip6_mr_input(struct sk_buff *skb) 2219 { 2220 struct mfc6_cache *cache; 2221 struct net *net = dev_net(skb->dev); 2222 struct mr_table *mrt; 2223 struct flowi6 fl6 = { 2224 .flowi6_iif = skb->dev->ifindex, 2225 .flowi6_mark = skb->mark, 2226 }; 2227 int err; 2228 struct net_device *dev; 2229 2230 /* skb->dev passed in is the master dev for vrfs. 2231 * Get the proper interface that does have a vif associated with it. 2232 */ 2233 dev = skb->dev; 2234 if (netif_is_l3_master(skb->dev)) { 2235 dev = dev_get_by_index_rcu(net, IPCB(skb)->iif); 2236 if (!dev) { 2237 kfree_skb(skb); 2238 return -ENODEV; 2239 } 2240 } 2241 2242 err = ip6mr_fib_lookup(net, &fl6, &mrt); 2243 if (err < 0) { 2244 kfree_skb(skb); 2245 return err; 2246 } 2247 2248 cache = ip6mr_cache_find(mrt, 2249 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr); 2250 if (!cache) { 2251 int vif = ip6mr_find_vif(mrt, dev); 2252 2253 if (vif >= 0) 2254 cache = ip6mr_cache_find_any(mrt, 2255 &ipv6_hdr(skb)->daddr, 2256 vif); 2257 } 2258 2259 /* 2260 * No usable cache entry 2261 */ 2262 if (!cache) { 2263 int vif; 2264 2265 vif = ip6mr_find_vif(mrt, dev); 2266 if (vif >= 0) { 2267 int err = ip6mr_cache_unresolved(mrt, vif, skb, dev); 2268 2269 return err; 2270 } 2271 kfree_skb(skb); 2272 return -ENODEV; 2273 } 2274 2275 ip6_mr_forward(net, mrt, dev, skb, cache); 2276 2277 return 0; 2278 } 2279 2280 int ip6mr_get_route(struct net *net, struct sk_buff *skb, struct rtmsg *rtm, 2281 u32 portid) 2282 { 2283 int err; 2284 struct mr_table *mrt; 2285 struct mfc6_cache *cache; 2286 struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); 2287 2288 mrt = ip6mr_get_table(net, RT6_TABLE_DFLT); 2289 if (!mrt) 2290 return -ENOENT; 2291 2292 rcu_read_lock(); 2293 cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr); 2294 if (!cache && skb->dev) { 2295 int vif = ip6mr_find_vif(mrt, skb->dev); 2296 2297 if (vif >= 0) 2298 cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr, 2299 vif); 2300 } 2301 2302 if (!cache) { 2303 struct sk_buff *skb2; 2304 struct ipv6hdr *iph; 2305 struct net_device *dev; 2306 int vif; 2307 2308 dev = skb->dev; 2309 if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) { 2310 rcu_read_unlock(); 2311 return -ENODEV; 2312 } 2313 2314 /* really correct? */ 2315 skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); 2316 if (!skb2) { 2317 rcu_read_unlock(); 2318 return -ENOMEM; 2319 } 2320 2321 NETLINK_CB(skb2).portid = portid; 2322 skb_reset_transport_header(skb2); 2323 2324 skb_put(skb2, sizeof(struct ipv6hdr)); 2325 skb_reset_network_header(skb2); 2326 2327 iph = ipv6_hdr(skb2); 2328 iph->version = 0; 2329 iph->priority = 0; 2330 iph->flow_lbl[0] = 0; 2331 iph->flow_lbl[1] = 0; 2332 iph->flow_lbl[2] = 0; 2333 iph->payload_len = 0; 2334 iph->nexthdr = IPPROTO_NONE; 2335 iph->hop_limit = 0; 2336 iph->saddr = rt->rt6i_src.addr; 2337 iph->daddr = rt->rt6i_dst.addr; 2338 2339 err = ip6mr_cache_unresolved(mrt, vif, skb2, dev); 2340 rcu_read_unlock(); 2341 2342 return err; 2343 } 2344 2345 err = mr_fill_mroute(mrt, skb, &cache->_c, rtm); 2346 rcu_read_unlock(); 2347 return err; 2348 } 2349 2350 static int ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, 2351 u32 portid, u32 seq, struct mfc6_cache *c, int cmd, 2352 int flags) 2353 { 2354 struct nlmsghdr *nlh; 2355 struct rtmsg *rtm; 2356 int err; 2357 2358 nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags); 2359 if (!nlh) 2360 return -EMSGSIZE; 2361 2362 rtm = nlmsg_data(nlh); 2363 rtm->rtm_family = RTNL_FAMILY_IP6MR; 2364 rtm->rtm_dst_len = 128; 2365 rtm->rtm_src_len = 128; 2366 rtm->rtm_tos = 0; 2367 rtm->rtm_table = mrt->id; 2368 if (nla_put_u32(skb, RTA_TABLE, mrt->id)) 2369 goto nla_put_failure; 2370 rtm->rtm_type = RTN_MULTICAST; 2371 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2372 if (c->_c.mfc_flags & MFC_STATIC) 2373 rtm->rtm_protocol = RTPROT_STATIC; 2374 else 2375 rtm->rtm_protocol = RTPROT_MROUTED; 2376 rtm->rtm_flags = 0; 2377 2378 if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) || 2379 nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp)) 2380 goto nla_put_failure; 2381 err = mr_fill_mroute(mrt, skb, &c->_c, rtm); 2382 /* do not break the dump if cache is unresolved */ 2383 if (err < 0 && err != -ENOENT) 2384 goto nla_put_failure; 2385 2386 nlmsg_end(skb, nlh); 2387 return 0; 2388 2389 nla_put_failure: 2390 nlmsg_cancel(skb, nlh); 2391 return -EMSGSIZE; 2392 } 2393 2394 static int _ip6mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, 2395 u32 portid, u32 seq, struct mr_mfc *c, 2396 int cmd, int flags) 2397 { 2398 return ip6mr_fill_mroute(mrt, skb, portid, seq, (struct mfc6_cache *)c, 2399 cmd, flags); 2400 } 2401 2402 static int mr6_msgsize(bool unresolved, int maxvif) 2403 { 2404 size_t len = 2405 NLMSG_ALIGN(sizeof(struct rtmsg)) 2406 + nla_total_size(4) /* RTA_TABLE */ 2407 + nla_total_size(sizeof(struct in6_addr)) /* RTA_SRC */ 2408 + nla_total_size(sizeof(struct in6_addr)) /* RTA_DST */ 2409 ; 2410 2411 if (!unresolved) 2412 len = len 2413 + nla_total_size(4) /* RTA_IIF */ 2414 + nla_total_size(0) /* RTA_MULTIPATH */ 2415 + maxvif * NLA_ALIGN(sizeof(struct rtnexthop)) 2416 /* RTA_MFC_STATS */ 2417 + nla_total_size_64bit(sizeof(struct rta_mfc_stats)) 2418 ; 2419 2420 return len; 2421 } 2422 2423 static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc, 2424 int cmd) 2425 { 2426 struct net *net = read_pnet(&mrt->net); 2427 struct sk_buff *skb; 2428 int err = -ENOBUFS; 2429 2430 skb = nlmsg_new(mr6_msgsize(mfc->_c.mfc_parent >= MAXMIFS, mrt->maxvif), 2431 GFP_ATOMIC); 2432 if (!skb) 2433 goto errout; 2434 2435 err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0); 2436 if (err < 0) 2437 goto errout; 2438 2439 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC); 2440 return; 2441 2442 errout: 2443 kfree_skb(skb); 2444 if (err < 0) 2445 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err); 2446 } 2447 2448 static size_t mrt6msg_netlink_msgsize(size_t payloadlen) 2449 { 2450 size_t len = 2451 NLMSG_ALIGN(sizeof(struct rtgenmsg)) 2452 + nla_total_size(1) /* IP6MRA_CREPORT_MSGTYPE */ 2453 + nla_total_size(4) /* IP6MRA_CREPORT_MIF_ID */ 2454 /* IP6MRA_CREPORT_SRC_ADDR */ 2455 + nla_total_size(sizeof(struct in6_addr)) 2456 /* IP6MRA_CREPORT_DST_ADDR */ 2457 + nla_total_size(sizeof(struct in6_addr)) 2458 /* IP6MRA_CREPORT_PKT */ 2459 + nla_total_size(payloadlen) 2460 ; 2461 2462 return len; 2463 } 2464 2465 static void mrt6msg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt) 2466 { 2467 struct net *net = read_pnet(&mrt->net); 2468 struct nlmsghdr *nlh; 2469 struct rtgenmsg *rtgenm; 2470 struct mrt6msg *msg; 2471 struct sk_buff *skb; 2472 struct nlattr *nla; 2473 int payloadlen; 2474 2475 payloadlen = pkt->len - sizeof(struct mrt6msg); 2476 msg = (struct mrt6msg *)skb_transport_header(pkt); 2477 2478 skb = nlmsg_new(mrt6msg_netlink_msgsize(payloadlen), GFP_ATOMIC); 2479 if (!skb) 2480 goto errout; 2481 2482 nlh = nlmsg_put(skb, 0, 0, RTM_NEWCACHEREPORT, 2483 sizeof(struct rtgenmsg), 0); 2484 if (!nlh) 2485 goto errout; 2486 rtgenm = nlmsg_data(nlh); 2487 rtgenm->rtgen_family = RTNL_FAMILY_IP6MR; 2488 if (nla_put_u8(skb, IP6MRA_CREPORT_MSGTYPE, msg->im6_msgtype) || 2489 nla_put_u32(skb, IP6MRA_CREPORT_MIF_ID, msg->im6_mif) || 2490 nla_put_in6_addr(skb, IP6MRA_CREPORT_SRC_ADDR, 2491 &msg->im6_src) || 2492 nla_put_in6_addr(skb, IP6MRA_CREPORT_DST_ADDR, 2493 &msg->im6_dst)) 2494 goto nla_put_failure; 2495 2496 nla = nla_reserve(skb, IP6MRA_CREPORT_PKT, payloadlen); 2497 if (!nla || skb_copy_bits(pkt, sizeof(struct mrt6msg), 2498 nla_data(nla), payloadlen)) 2499 goto nla_put_failure; 2500 2501 nlmsg_end(skb, nlh); 2502 2503 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE_R, NULL, GFP_ATOMIC); 2504 return; 2505 2506 nla_put_failure: 2507 nlmsg_cancel(skb, nlh); 2508 errout: 2509 kfree_skb(skb); 2510 rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS); 2511 } 2512 2513 static const struct nla_policy ip6mr_getroute_policy[RTA_MAX + 1] = { 2514 [RTA_SRC] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 2515 [RTA_DST] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)), 2516 [RTA_TABLE] = { .type = NLA_U32 }, 2517 }; 2518 2519 static int ip6mr_rtm_valid_getroute_req(struct sk_buff *skb, 2520 const struct nlmsghdr *nlh, 2521 struct nlattr **tb, 2522 struct netlink_ext_ack *extack) 2523 { 2524 struct rtmsg *rtm; 2525 int err; 2526 2527 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, ip6mr_getroute_policy, 2528 extack); 2529 if (err) 2530 return err; 2531 2532 rtm = nlmsg_data(nlh); 2533 if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) || 2534 (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) || 2535 rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol || 2536 rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) { 2537 NL_SET_ERR_MSG_MOD(extack, 2538 "Invalid values in header for multicast route get request"); 2539 return -EINVAL; 2540 } 2541 2542 if ((tb[RTA_SRC] && !rtm->rtm_src_len) || 2543 (tb[RTA_DST] && !rtm->rtm_dst_len)) { 2544 NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6"); 2545 return -EINVAL; 2546 } 2547 2548 return 0; 2549 } 2550 2551 static int ip6mr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, 2552 struct netlink_ext_ack *extack) 2553 { 2554 struct net *net = sock_net(in_skb->sk); 2555 struct in6_addr src = {}, grp = {}; 2556 struct nlattr *tb[RTA_MAX + 1]; 2557 struct mfc6_cache *cache; 2558 struct mr_table *mrt; 2559 struct sk_buff *skb; 2560 u32 tableid; 2561 int err; 2562 2563 err = ip6mr_rtm_valid_getroute_req(in_skb, nlh, tb, extack); 2564 if (err < 0) 2565 return err; 2566 2567 if (tb[RTA_SRC]) 2568 src = nla_get_in6_addr(tb[RTA_SRC]); 2569 if (tb[RTA_DST]) 2570 grp = nla_get_in6_addr(tb[RTA_DST]); 2571 tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0; 2572 2573 mrt = ip6mr_get_table(net, tableid ?: RT_TABLE_DEFAULT); 2574 if (!mrt) { 2575 NL_SET_ERR_MSG_MOD(extack, "MR table does not exist"); 2576 return -ENOENT; 2577 } 2578 2579 /* entries are added/deleted only under RTNL */ 2580 rcu_read_lock(); 2581 cache = ip6mr_cache_find(mrt, &src, &grp); 2582 rcu_read_unlock(); 2583 if (!cache) { 2584 NL_SET_ERR_MSG_MOD(extack, "MR cache entry not found"); 2585 return -ENOENT; 2586 } 2587 2588 skb = nlmsg_new(mr6_msgsize(false, mrt->maxvif), GFP_KERNEL); 2589 if (!skb) 2590 return -ENOBUFS; 2591 2592 err = ip6mr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid, 2593 nlh->nlmsg_seq, cache, RTM_NEWROUTE, 0); 2594 if (err < 0) { 2595 kfree_skb(skb); 2596 return err; 2597 } 2598 2599 return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 2600 } 2601 2602 static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb) 2603 { 2604 const struct nlmsghdr *nlh = cb->nlh; 2605 struct fib_dump_filter filter = {}; 2606 int err; 2607 2608 if (cb->strict_check) { 2609 err = ip_valid_fib_dump_req(sock_net(skb->sk), nlh, 2610 &filter, cb); 2611 if (err < 0) 2612 return err; 2613 } 2614 2615 if (filter.table_id) { 2616 struct mr_table *mrt; 2617 2618 mrt = ip6mr_get_table(sock_net(skb->sk), filter.table_id); 2619 if (!mrt) { 2620 if (rtnl_msg_family(cb->nlh) != RTNL_FAMILY_IP6MR) 2621 return skb->len; 2622 2623 NL_SET_ERR_MSG_MOD(cb->extack, "MR table does not exist"); 2624 return -ENOENT; 2625 } 2626 err = mr_table_dump(mrt, skb, cb, _ip6mr_fill_mroute, 2627 &mfc_unres_lock, &filter); 2628 return skb->len ? : err; 2629 } 2630 2631 return mr_rtm_dumproute(skb, cb, ip6mr_mr_table_iter, 2632 _ip6mr_fill_mroute, &mfc_unres_lock, &filter); 2633 } 2634