1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * IPv4 Forwarding Information Base: FIB frontend. 7 * 8 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16 #include <linux/module.h> 17 #include <linux/uaccess.h> 18 #include <linux/bitops.h> 19 #include <linux/capability.h> 20 #include <linux/types.h> 21 #include <linux/kernel.h> 22 #include <linux/mm.h> 23 #include <linux/string.h> 24 #include <linux/socket.h> 25 #include <linux/sockios.h> 26 #include <linux/errno.h> 27 #include <linux/in.h> 28 #include <linux/inet.h> 29 #include <linux/inetdevice.h> 30 #include <linux/netdevice.h> 31 #include <linux/if_addr.h> 32 #include <linux/if_arp.h> 33 #include <linux/skbuff.h> 34 #include <linux/cache.h> 35 #include <linux/init.h> 36 #include <linux/list.h> 37 #include <linux/slab.h> 38 39 #include <net/ip.h> 40 #include <net/protocol.h> 41 #include <net/route.h> 42 #include <net/tcp.h> 43 #include <net/sock.h> 44 #include <net/arp.h> 45 #include <net/ip_fib.h> 46 #include <net/rtnetlink.h> 47 #include <net/xfrm.h> 48 #include <net/l3mdev.h> 49 #include <net/lwtunnel.h> 50 #include <trace/events/fib.h> 51 52 #ifndef CONFIG_IP_MULTIPLE_TABLES 53 54 static int __net_init fib4_rules_init(struct net *net) 55 { 56 struct fib_table *local_table, *main_table; 57 58 main_table = fib_trie_table(RT_TABLE_MAIN, NULL); 59 if (!main_table) 60 return -ENOMEM; 61 62 local_table = fib_trie_table(RT_TABLE_LOCAL, main_table); 63 if (!local_table) 64 goto fail; 65 66 hlist_add_head_rcu(&local_table->tb_hlist, 67 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); 68 hlist_add_head_rcu(&main_table->tb_hlist, 69 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); 70 return 0; 71 72 fail: 73 fib_free_table(main_table); 74 return -ENOMEM; 75 } 76 77 static bool fib4_has_custom_rules(struct net *net) 78 { 79 return false; 80 } 81 #else 82 83 struct fib_table *fib_new_table(struct net *net, u32 id) 84 { 85 struct fib_table *tb, *alias = NULL; 86 unsigned int h; 87 88 if (id == 0) 89 id = RT_TABLE_MAIN; 90 tb = fib_get_table(net, id); 91 if (tb) 92 return tb; 93 94 if (id == RT_TABLE_LOCAL && !net->ipv4.fib_has_custom_rules) 95 alias = fib_new_table(net, RT_TABLE_MAIN); 96 97 tb = fib_trie_table(id, alias); 98 if (!tb) 99 return NULL; 100 101 switch (id) { 102 case RT_TABLE_MAIN: 103 rcu_assign_pointer(net->ipv4.fib_main, tb); 104 break; 105 case RT_TABLE_DEFAULT: 106 rcu_assign_pointer(net->ipv4.fib_default, tb); 107 break; 108 default: 109 break; 110 } 111 112 h = id & (FIB_TABLE_HASHSZ - 1); 113 hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); 114 return tb; 115 } 116 EXPORT_SYMBOL_GPL(fib_new_table); 117 118 /* caller must hold either rtnl or rcu read lock */ 119 struct fib_table *fib_get_table(struct net *net, u32 id) 120 { 121 struct fib_table *tb; 122 struct hlist_head *head; 123 unsigned int h; 124 125 if (id == 0) 126 id = RT_TABLE_MAIN; 127 h = id & (FIB_TABLE_HASHSZ - 1); 128 129 head = &net->ipv4.fib_table_hash[h]; 130 hlist_for_each_entry_rcu(tb, head, tb_hlist) { 131 if (tb->tb_id == id) 132 return tb; 133 } 134 return NULL; 135 } 136 137 static bool fib4_has_custom_rules(struct net *net) 138 { 139 return net->ipv4.fib_has_custom_rules; 140 } 141 #endif /* CONFIG_IP_MULTIPLE_TABLES */ 142 143 static void fib_replace_table(struct net *net, struct fib_table *old, 144 struct fib_table *new) 145 { 146 #ifdef CONFIG_IP_MULTIPLE_TABLES 147 switch (new->tb_id) { 148 case RT_TABLE_MAIN: 149 rcu_assign_pointer(net->ipv4.fib_main, new); 150 break; 151 case RT_TABLE_DEFAULT: 152 rcu_assign_pointer(net->ipv4.fib_default, new); 153 break; 154 default: 155 break; 156 } 157 158 #endif 159 /* replace the old table in the hlist */ 160 hlist_replace_rcu(&old->tb_hlist, &new->tb_hlist); 161 } 162 163 int fib_unmerge(struct net *net) 164 { 165 struct fib_table *old, *new, *main_table; 166 167 /* attempt to fetch local table if it has been allocated */ 168 old = fib_get_table(net, RT_TABLE_LOCAL); 169 if (!old) 170 return 0; 171 172 new = fib_trie_unmerge(old); 173 if (!new) 174 return -ENOMEM; 175 176 /* table is already unmerged */ 177 if (new == old) 178 return 0; 179 180 /* replace merged table with clean table */ 181 fib_replace_table(net, old, new); 182 fib_free_table(old); 183 184 /* attempt to fetch main table if it has been allocated */ 185 main_table = fib_get_table(net, RT_TABLE_MAIN); 186 if (!main_table) 187 return 0; 188 189 /* flush local entries from main table */ 190 fib_table_flush_external(main_table); 191 192 return 0; 193 } 194 195 static void fib_flush(struct net *net) 196 { 197 int flushed = 0; 198 unsigned int h; 199 200 for (h = 0; h < FIB_TABLE_HASHSZ; h++) { 201 struct hlist_head *head = &net->ipv4.fib_table_hash[h]; 202 struct hlist_node *tmp; 203 struct fib_table *tb; 204 205 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) 206 flushed += fib_table_flush(net, tb); 207 } 208 209 if (flushed) 210 rt_cache_flush(net); 211 } 212 213 /* 214 * Find address type as if only "dev" was present in the system. If 215 * on_dev is NULL then all interfaces are taken into consideration. 216 */ 217 static inline unsigned int __inet_dev_addr_type(struct net *net, 218 const struct net_device *dev, 219 __be32 addr, u32 tb_id) 220 { 221 struct flowi4 fl4 = { .daddr = addr }; 222 struct fib_result res; 223 unsigned int ret = RTN_BROADCAST; 224 struct fib_table *table; 225 226 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) 227 return RTN_BROADCAST; 228 if (ipv4_is_multicast(addr)) 229 return RTN_MULTICAST; 230 231 rcu_read_lock(); 232 233 table = fib_get_table(net, tb_id); 234 if (table) { 235 ret = RTN_UNICAST; 236 if (!fib_table_lookup(table, &fl4, &res, FIB_LOOKUP_NOREF)) { 237 if (!dev || dev == res.fi->fib_dev) 238 ret = res.type; 239 } 240 } 241 242 rcu_read_unlock(); 243 return ret; 244 } 245 246 unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id) 247 { 248 return __inet_dev_addr_type(net, NULL, addr, tb_id); 249 } 250 EXPORT_SYMBOL(inet_addr_type_table); 251 252 unsigned int inet_addr_type(struct net *net, __be32 addr) 253 { 254 return __inet_dev_addr_type(net, NULL, addr, RT_TABLE_LOCAL); 255 } 256 EXPORT_SYMBOL(inet_addr_type); 257 258 unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, 259 __be32 addr) 260 { 261 u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; 262 263 return __inet_dev_addr_type(net, dev, addr, rt_table); 264 } 265 EXPORT_SYMBOL(inet_dev_addr_type); 266 267 /* inet_addr_type with dev == NULL but using the table from a dev 268 * if one is associated 269 */ 270 unsigned int inet_addr_type_dev_table(struct net *net, 271 const struct net_device *dev, 272 __be32 addr) 273 { 274 u32 rt_table = l3mdev_fib_table(dev) ? : RT_TABLE_LOCAL; 275 276 return __inet_dev_addr_type(net, NULL, addr, rt_table); 277 } 278 EXPORT_SYMBOL(inet_addr_type_dev_table); 279 280 __be32 fib_compute_spec_dst(struct sk_buff *skb) 281 { 282 struct net_device *dev = skb->dev; 283 struct in_device *in_dev; 284 struct fib_result res; 285 struct rtable *rt; 286 struct net *net; 287 int scope; 288 289 rt = skb_rtable(skb); 290 if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) == 291 RTCF_LOCAL) 292 return ip_hdr(skb)->daddr; 293 294 in_dev = __in_dev_get_rcu(dev); 295 BUG_ON(!in_dev); 296 297 net = dev_net(dev); 298 299 scope = RT_SCOPE_UNIVERSE; 300 if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) { 301 struct flowi4 fl4 = { 302 .flowi4_iif = LOOPBACK_IFINDEX, 303 .daddr = ip_hdr(skb)->saddr, 304 .flowi4_tos = RT_TOS(ip_hdr(skb)->tos), 305 .flowi4_scope = scope, 306 .flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0, 307 }; 308 if (!fib_lookup(net, &fl4, &res, 0)) 309 return FIB_RES_PREFSRC(net, res); 310 } else { 311 scope = RT_SCOPE_LINK; 312 } 313 314 return inet_select_addr(dev, ip_hdr(skb)->saddr, scope); 315 } 316 317 /* Given (packet source, input interface) and optional (dst, oif, tos): 318 * - (main) check, that source is valid i.e. not broadcast or our local 319 * address. 320 * - figure out what "logical" interface this packet arrived 321 * and calculate "specific destination" address. 322 * - check, that packet arrived from expected physical interface. 323 * called with rcu_read_lock() 324 */ 325 static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, 326 u8 tos, int oif, struct net_device *dev, 327 int rpf, struct in_device *idev, u32 *itag) 328 { 329 struct net *net = dev_net(dev); 330 struct flow_keys flkeys; 331 int ret, no_addr; 332 struct fib_result res; 333 struct flowi4 fl4; 334 bool dev_match; 335 336 fl4.flowi4_oif = 0; 337 fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev); 338 if (!fl4.flowi4_iif) 339 fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; 340 fl4.daddr = src; 341 fl4.saddr = dst; 342 fl4.flowi4_tos = tos; 343 fl4.flowi4_scope = RT_SCOPE_UNIVERSE; 344 fl4.flowi4_tun_key.tun_id = 0; 345 fl4.flowi4_flags = 0; 346 fl4.flowi4_uid = sock_net_uid(net, NULL); 347 348 no_addr = idev->ifa_list == NULL; 349 350 fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; 351 if (!fib4_rules_early_flow_dissect(net, skb, &fl4, &flkeys)) { 352 fl4.flowi4_proto = 0; 353 fl4.fl4_sport = 0; 354 fl4.fl4_dport = 0; 355 } 356 357 trace_fib_validate_source(dev, &fl4); 358 359 if (fib_lookup(net, &fl4, &res, 0)) 360 goto last_resort; 361 if (res.type != RTN_UNICAST && 362 (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) 363 goto e_inval; 364 fib_combine_itag(itag, &res); 365 dev_match = false; 366 367 #ifdef CONFIG_IP_ROUTE_MULTIPATH 368 for (ret = 0; ret < res.fi->fib_nhs; ret++) { 369 struct fib_nh *nh = &res.fi->fib_nh[ret]; 370 371 if (nh->nh_dev == dev) { 372 dev_match = true; 373 break; 374 } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) { 375 dev_match = true; 376 break; 377 } 378 } 379 #else 380 if (FIB_RES_DEV(res) == dev) 381 dev_match = true; 382 #endif 383 if (dev_match) { 384 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; 385 return ret; 386 } 387 if (no_addr) 388 goto last_resort; 389 if (rpf == 1) 390 goto e_rpf; 391 fl4.flowi4_oif = dev->ifindex; 392 393 ret = 0; 394 if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { 395 if (res.type == RTN_UNICAST) 396 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; 397 } 398 return ret; 399 400 last_resort: 401 if (rpf) 402 goto e_rpf; 403 *itag = 0; 404 return 0; 405 406 e_inval: 407 return -EINVAL; 408 e_rpf: 409 return -EXDEV; 410 } 411 412 /* Ignore rp_filter for packets protected by IPsec. */ 413 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, 414 u8 tos, int oif, struct net_device *dev, 415 struct in_device *idev, u32 *itag) 416 { 417 int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); 418 struct net *net = dev_net(dev); 419 420 if (!r && !fib_num_tclassid_users(net) && 421 (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { 422 if (IN_DEV_ACCEPT_LOCAL(idev)) 423 goto ok; 424 /* with custom local routes in place, checking local addresses 425 * only will be too optimistic, with custom rules, checking 426 * local addresses only can be too strict, e.g. due to vrf 427 */ 428 if (net->ipv4.fib_has_custom_local_routes || 429 fib4_has_custom_rules(net)) 430 goto full_check; 431 if (inet_lookup_ifaddr_rcu(net, src)) 432 return -EINVAL; 433 434 ok: 435 *itag = 0; 436 return 0; 437 } 438 439 full_check: 440 return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); 441 } 442 443 static inline __be32 sk_extract_addr(struct sockaddr *addr) 444 { 445 return ((struct sockaddr_in *) addr)->sin_addr.s_addr; 446 } 447 448 static int put_rtax(struct nlattr *mx, int len, int type, u32 value) 449 { 450 struct nlattr *nla; 451 452 nla = (struct nlattr *) ((char *) mx + len); 453 nla->nla_type = type; 454 nla->nla_len = nla_attr_size(4); 455 *(u32 *) nla_data(nla) = value; 456 457 return len + nla_total_size(4); 458 } 459 460 static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, 461 struct fib_config *cfg) 462 { 463 __be32 addr; 464 int plen; 465 466 memset(cfg, 0, sizeof(*cfg)); 467 cfg->fc_nlinfo.nl_net = net; 468 469 if (rt->rt_dst.sa_family != AF_INET) 470 return -EAFNOSUPPORT; 471 472 /* 473 * Check mask for validity: 474 * a) it must be contiguous. 475 * b) destination must have all host bits clear. 476 * c) if application forgot to set correct family (AF_INET), 477 * reject request unless it is absolutely clear i.e. 478 * both family and mask are zero. 479 */ 480 plen = 32; 481 addr = sk_extract_addr(&rt->rt_dst); 482 if (!(rt->rt_flags & RTF_HOST)) { 483 __be32 mask = sk_extract_addr(&rt->rt_genmask); 484 485 if (rt->rt_genmask.sa_family != AF_INET) { 486 if (mask || rt->rt_genmask.sa_family) 487 return -EAFNOSUPPORT; 488 } 489 490 if (bad_mask(mask, addr)) 491 return -EINVAL; 492 493 plen = inet_mask_len(mask); 494 } 495 496 cfg->fc_dst_len = plen; 497 cfg->fc_dst = addr; 498 499 if (cmd != SIOCDELRT) { 500 cfg->fc_nlflags = NLM_F_CREATE; 501 cfg->fc_protocol = RTPROT_BOOT; 502 } 503 504 if (rt->rt_metric) 505 cfg->fc_priority = rt->rt_metric - 1; 506 507 if (rt->rt_flags & RTF_REJECT) { 508 cfg->fc_scope = RT_SCOPE_HOST; 509 cfg->fc_type = RTN_UNREACHABLE; 510 return 0; 511 } 512 513 cfg->fc_scope = RT_SCOPE_NOWHERE; 514 cfg->fc_type = RTN_UNICAST; 515 516 if (rt->rt_dev) { 517 char *colon; 518 struct net_device *dev; 519 char devname[IFNAMSIZ]; 520 521 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) 522 return -EFAULT; 523 524 devname[IFNAMSIZ-1] = 0; 525 colon = strchr(devname, ':'); 526 if (colon) 527 *colon = 0; 528 dev = __dev_get_by_name(net, devname); 529 if (!dev) 530 return -ENODEV; 531 cfg->fc_oif = dev->ifindex; 532 cfg->fc_table = l3mdev_fib_table(dev); 533 if (colon) { 534 struct in_ifaddr *ifa; 535 struct in_device *in_dev = __in_dev_get_rtnl(dev); 536 if (!in_dev) 537 return -ENODEV; 538 *colon = ':'; 539 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) 540 if (strcmp(ifa->ifa_label, devname) == 0) 541 break; 542 if (!ifa) 543 return -ENODEV; 544 cfg->fc_prefsrc = ifa->ifa_local; 545 } 546 } 547 548 addr = sk_extract_addr(&rt->rt_gateway); 549 if (rt->rt_gateway.sa_family == AF_INET && addr) { 550 unsigned int addr_type; 551 552 cfg->fc_gw = addr; 553 addr_type = inet_addr_type_table(net, addr, cfg->fc_table); 554 if (rt->rt_flags & RTF_GATEWAY && 555 addr_type == RTN_UNICAST) 556 cfg->fc_scope = RT_SCOPE_UNIVERSE; 557 } 558 559 if (cmd == SIOCDELRT) 560 return 0; 561 562 if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) 563 return -EINVAL; 564 565 if (cfg->fc_scope == RT_SCOPE_NOWHERE) 566 cfg->fc_scope = RT_SCOPE_LINK; 567 568 if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { 569 struct nlattr *mx; 570 int len = 0; 571 572 mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); 573 if (!mx) 574 return -ENOMEM; 575 576 if (rt->rt_flags & RTF_MTU) 577 len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); 578 579 if (rt->rt_flags & RTF_WINDOW) 580 len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); 581 582 if (rt->rt_flags & RTF_IRTT) 583 len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); 584 585 cfg->fc_mx = mx; 586 cfg->fc_mx_len = len; 587 } 588 589 return 0; 590 } 591 592 /* 593 * Handle IP routing ioctl calls. 594 * These are used to manipulate the routing tables 595 */ 596 int ip_rt_ioctl(struct net *net, unsigned int cmd, struct rtentry *rt) 597 { 598 struct fib_config cfg; 599 int err; 600 601 switch (cmd) { 602 case SIOCADDRT: /* Add a route */ 603 case SIOCDELRT: /* Delete a route */ 604 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 605 return -EPERM; 606 607 rtnl_lock(); 608 err = rtentry_to_fib_config(net, cmd, rt, &cfg); 609 if (err == 0) { 610 struct fib_table *tb; 611 612 if (cmd == SIOCDELRT) { 613 tb = fib_get_table(net, cfg.fc_table); 614 if (tb) 615 err = fib_table_delete(net, tb, &cfg, 616 NULL); 617 else 618 err = -ESRCH; 619 } else { 620 tb = fib_new_table(net, cfg.fc_table); 621 if (tb) 622 err = fib_table_insert(net, tb, 623 &cfg, NULL); 624 else 625 err = -ENOBUFS; 626 } 627 628 /* allocated by rtentry_to_fib_config() */ 629 kfree(cfg.fc_mx); 630 } 631 rtnl_unlock(); 632 return err; 633 } 634 return -EINVAL; 635 } 636 637 const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { 638 [RTA_DST] = { .type = NLA_U32 }, 639 [RTA_SRC] = { .type = NLA_U32 }, 640 [RTA_IIF] = { .type = NLA_U32 }, 641 [RTA_OIF] = { .type = NLA_U32 }, 642 [RTA_GATEWAY] = { .type = NLA_U32 }, 643 [RTA_PRIORITY] = { .type = NLA_U32 }, 644 [RTA_PREFSRC] = { .type = NLA_U32 }, 645 [RTA_METRICS] = { .type = NLA_NESTED }, 646 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, 647 [RTA_FLOW] = { .type = NLA_U32 }, 648 [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, 649 [RTA_ENCAP] = { .type = NLA_NESTED }, 650 [RTA_UID] = { .type = NLA_U32 }, 651 [RTA_MARK] = { .type = NLA_U32 }, 652 [RTA_TABLE] = { .type = NLA_U32 }, 653 }; 654 655 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, 656 struct nlmsghdr *nlh, struct fib_config *cfg, 657 struct netlink_ext_ack *extack) 658 { 659 struct nlattr *attr; 660 int err, remaining; 661 struct rtmsg *rtm; 662 663 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy, 664 extack); 665 if (err < 0) 666 goto errout; 667 668 memset(cfg, 0, sizeof(*cfg)); 669 670 rtm = nlmsg_data(nlh); 671 cfg->fc_dst_len = rtm->rtm_dst_len; 672 cfg->fc_tos = rtm->rtm_tos; 673 cfg->fc_table = rtm->rtm_table; 674 cfg->fc_protocol = rtm->rtm_protocol; 675 cfg->fc_scope = rtm->rtm_scope; 676 cfg->fc_type = rtm->rtm_type; 677 cfg->fc_flags = rtm->rtm_flags; 678 cfg->fc_nlflags = nlh->nlmsg_flags; 679 680 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; 681 cfg->fc_nlinfo.nlh = nlh; 682 cfg->fc_nlinfo.nl_net = net; 683 684 if (cfg->fc_type > RTN_MAX) { 685 NL_SET_ERR_MSG(extack, "Invalid route type"); 686 err = -EINVAL; 687 goto errout; 688 } 689 690 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { 691 switch (nla_type(attr)) { 692 case RTA_DST: 693 cfg->fc_dst = nla_get_be32(attr); 694 break; 695 case RTA_OIF: 696 cfg->fc_oif = nla_get_u32(attr); 697 break; 698 case RTA_GATEWAY: 699 cfg->fc_gw = nla_get_be32(attr); 700 break; 701 case RTA_PRIORITY: 702 cfg->fc_priority = nla_get_u32(attr); 703 break; 704 case RTA_PREFSRC: 705 cfg->fc_prefsrc = nla_get_be32(attr); 706 break; 707 case RTA_METRICS: 708 cfg->fc_mx = nla_data(attr); 709 cfg->fc_mx_len = nla_len(attr); 710 break; 711 case RTA_MULTIPATH: 712 err = lwtunnel_valid_encap_type_attr(nla_data(attr), 713 nla_len(attr), 714 extack); 715 if (err < 0) 716 goto errout; 717 cfg->fc_mp = nla_data(attr); 718 cfg->fc_mp_len = nla_len(attr); 719 break; 720 case RTA_FLOW: 721 cfg->fc_flow = nla_get_u32(attr); 722 break; 723 case RTA_TABLE: 724 cfg->fc_table = nla_get_u32(attr); 725 break; 726 case RTA_ENCAP: 727 cfg->fc_encap = attr; 728 break; 729 case RTA_ENCAP_TYPE: 730 cfg->fc_encap_type = nla_get_u16(attr); 731 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, 732 extack); 733 if (err < 0) 734 goto errout; 735 break; 736 } 737 } 738 739 return 0; 740 errout: 741 return err; 742 } 743 744 static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 745 struct netlink_ext_ack *extack) 746 { 747 struct net *net = sock_net(skb->sk); 748 struct fib_config cfg; 749 struct fib_table *tb; 750 int err; 751 752 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); 753 if (err < 0) 754 goto errout; 755 756 tb = fib_get_table(net, cfg.fc_table); 757 if (!tb) { 758 NL_SET_ERR_MSG(extack, "FIB table does not exist"); 759 err = -ESRCH; 760 goto errout; 761 } 762 763 err = fib_table_delete(net, tb, &cfg, extack); 764 errout: 765 return err; 766 } 767 768 static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 769 struct netlink_ext_ack *extack) 770 { 771 struct net *net = sock_net(skb->sk); 772 struct fib_config cfg; 773 struct fib_table *tb; 774 int err; 775 776 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); 777 if (err < 0) 778 goto errout; 779 780 tb = fib_new_table(net, cfg.fc_table); 781 if (!tb) { 782 err = -ENOBUFS; 783 goto errout; 784 } 785 786 err = fib_table_insert(net, tb, &cfg, extack); 787 if (!err && cfg.fc_type == RTN_LOCAL) 788 net->ipv4.fib_has_custom_local_routes = true; 789 errout: 790 return err; 791 } 792 793 static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) 794 { 795 struct net *net = sock_net(skb->sk); 796 unsigned int h, s_h; 797 unsigned int e = 0, s_e; 798 struct fib_table *tb; 799 struct hlist_head *head; 800 int dumped = 0, err; 801 802 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && 803 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) 804 return skb->len; 805 806 s_h = cb->args[0]; 807 s_e = cb->args[1]; 808 809 rcu_read_lock(); 810 811 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { 812 e = 0; 813 head = &net->ipv4.fib_table_hash[h]; 814 hlist_for_each_entry_rcu(tb, head, tb_hlist) { 815 if (e < s_e) 816 goto next; 817 if (dumped) 818 memset(&cb->args[2], 0, sizeof(cb->args) - 819 2 * sizeof(cb->args[0])); 820 err = fib_table_dump(tb, skb, cb); 821 if (err < 0) { 822 if (likely(skb->len)) 823 goto out; 824 825 goto out_err; 826 } 827 dumped = 1; 828 next: 829 e++; 830 } 831 } 832 out: 833 err = skb->len; 834 out_err: 835 rcu_read_unlock(); 836 837 cb->args[1] = e; 838 cb->args[0] = h; 839 840 return err; 841 } 842 843 /* Prepare and feed intra-kernel routing request. 844 * Really, it should be netlink message, but :-( netlink 845 * can be not configured, so that we feed it directly 846 * to fib engine. It is legal, because all events occur 847 * only when netlink is already locked. 848 */ 849 static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) 850 { 851 struct net *net = dev_net(ifa->ifa_dev->dev); 852 u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); 853 struct fib_table *tb; 854 struct fib_config cfg = { 855 .fc_protocol = RTPROT_KERNEL, 856 .fc_type = type, 857 .fc_dst = dst, 858 .fc_dst_len = dst_len, 859 .fc_prefsrc = ifa->ifa_local, 860 .fc_oif = ifa->ifa_dev->dev->ifindex, 861 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, 862 .fc_nlinfo = { 863 .nl_net = net, 864 }, 865 }; 866 867 if (!tb_id) 868 tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; 869 870 tb = fib_new_table(net, tb_id); 871 if (!tb) 872 return; 873 874 cfg.fc_table = tb->tb_id; 875 876 if (type != RTN_LOCAL) 877 cfg.fc_scope = RT_SCOPE_LINK; 878 else 879 cfg.fc_scope = RT_SCOPE_HOST; 880 881 if (cmd == RTM_NEWROUTE) 882 fib_table_insert(net, tb, &cfg, NULL); 883 else 884 fib_table_delete(net, tb, &cfg, NULL); 885 } 886 887 void fib_add_ifaddr(struct in_ifaddr *ifa) 888 { 889 struct in_device *in_dev = ifa->ifa_dev; 890 struct net_device *dev = in_dev->dev; 891 struct in_ifaddr *prim = ifa; 892 __be32 mask = ifa->ifa_mask; 893 __be32 addr = ifa->ifa_local; 894 __be32 prefix = ifa->ifa_address & mask; 895 896 if (ifa->ifa_flags & IFA_F_SECONDARY) { 897 prim = inet_ifa_byprefix(in_dev, prefix, mask); 898 if (!prim) { 899 pr_warn("%s: bug: prim == NULL\n", __func__); 900 return; 901 } 902 } 903 904 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); 905 906 if (!(dev->flags & IFF_UP)) 907 return; 908 909 /* Add broadcast address, if it is explicitly assigned. */ 910 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) 911 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); 912 913 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && 914 (prefix != addr || ifa->ifa_prefixlen < 32)) { 915 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) 916 fib_magic(RTM_NEWROUTE, 917 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, 918 prefix, ifa->ifa_prefixlen, prim); 919 920 /* Add network specific broadcasts, when it takes a sense */ 921 if (ifa->ifa_prefixlen < 31) { 922 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); 923 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, 924 32, prim); 925 } 926 } 927 } 928 929 /* Delete primary or secondary address. 930 * Optionally, on secondary address promotion consider the addresses 931 * from subnet iprim as deleted, even if they are in device list. 932 * In this case the secondary ifa can be in device list. 933 */ 934 void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) 935 { 936 struct in_device *in_dev = ifa->ifa_dev; 937 struct net_device *dev = in_dev->dev; 938 struct in_ifaddr *ifa1; 939 struct in_ifaddr *prim = ifa, *prim1 = NULL; 940 __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; 941 __be32 any = ifa->ifa_address & ifa->ifa_mask; 942 #define LOCAL_OK 1 943 #define BRD_OK 2 944 #define BRD0_OK 4 945 #define BRD1_OK 8 946 unsigned int ok = 0; 947 int subnet = 0; /* Primary network */ 948 int gone = 1; /* Address is missing */ 949 int same_prefsrc = 0; /* Another primary with same IP */ 950 951 if (ifa->ifa_flags & IFA_F_SECONDARY) { 952 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); 953 if (!prim) { 954 /* if the device has been deleted, we don't perform 955 * address promotion 956 */ 957 if (!in_dev->dead) 958 pr_warn("%s: bug: prim == NULL\n", __func__); 959 return; 960 } 961 if (iprim && iprim != prim) { 962 pr_warn("%s: bug: iprim != prim\n", __func__); 963 return; 964 } 965 } else if (!ipv4_is_zeronet(any) && 966 (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { 967 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) 968 fib_magic(RTM_DELROUTE, 969 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, 970 any, ifa->ifa_prefixlen, prim); 971 subnet = 1; 972 } 973 974 if (in_dev->dead) 975 goto no_promotions; 976 977 /* Deletion is more complicated than add. 978 * We should take care of not to delete too much :-) 979 * 980 * Scan address list to be sure that addresses are really gone. 981 */ 982 983 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { 984 if (ifa1 == ifa) { 985 /* promotion, keep the IP */ 986 gone = 0; 987 continue; 988 } 989 /* Ignore IFAs from our subnet */ 990 if (iprim && ifa1->ifa_mask == iprim->ifa_mask && 991 inet_ifa_match(ifa1->ifa_address, iprim)) 992 continue; 993 994 /* Ignore ifa1 if it uses different primary IP (prefsrc) */ 995 if (ifa1->ifa_flags & IFA_F_SECONDARY) { 996 /* Another address from our subnet? */ 997 if (ifa1->ifa_mask == prim->ifa_mask && 998 inet_ifa_match(ifa1->ifa_address, prim)) 999 prim1 = prim; 1000 else { 1001 /* We reached the secondaries, so 1002 * same_prefsrc should be determined. 1003 */ 1004 if (!same_prefsrc) 1005 continue; 1006 /* Search new prim1 if ifa1 is not 1007 * using the current prim1 1008 */ 1009 if (!prim1 || 1010 ifa1->ifa_mask != prim1->ifa_mask || 1011 !inet_ifa_match(ifa1->ifa_address, prim1)) 1012 prim1 = inet_ifa_byprefix(in_dev, 1013 ifa1->ifa_address, 1014 ifa1->ifa_mask); 1015 if (!prim1) 1016 continue; 1017 if (prim1->ifa_local != prim->ifa_local) 1018 continue; 1019 } 1020 } else { 1021 if (prim->ifa_local != ifa1->ifa_local) 1022 continue; 1023 prim1 = ifa1; 1024 if (prim != prim1) 1025 same_prefsrc = 1; 1026 } 1027 if (ifa->ifa_local == ifa1->ifa_local) 1028 ok |= LOCAL_OK; 1029 if (ifa->ifa_broadcast == ifa1->ifa_broadcast) 1030 ok |= BRD_OK; 1031 if (brd == ifa1->ifa_broadcast) 1032 ok |= BRD1_OK; 1033 if (any == ifa1->ifa_broadcast) 1034 ok |= BRD0_OK; 1035 /* primary has network specific broadcasts */ 1036 if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { 1037 __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; 1038 __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; 1039 1040 if (!ipv4_is_zeronet(any1)) { 1041 if (ifa->ifa_broadcast == brd1 || 1042 ifa->ifa_broadcast == any1) 1043 ok |= BRD_OK; 1044 if (brd == brd1 || brd == any1) 1045 ok |= BRD1_OK; 1046 if (any == brd1 || any == any1) 1047 ok |= BRD0_OK; 1048 } 1049 } 1050 } 1051 1052 no_promotions: 1053 if (!(ok & BRD_OK)) 1054 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); 1055 if (subnet && ifa->ifa_prefixlen < 31) { 1056 if (!(ok & BRD1_OK)) 1057 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); 1058 if (!(ok & BRD0_OK)) 1059 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); 1060 } 1061 if (!(ok & LOCAL_OK)) { 1062 unsigned int addr_type; 1063 1064 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); 1065 1066 /* Check, that this local address finally disappeared. */ 1067 addr_type = inet_addr_type_dev_table(dev_net(dev), dev, 1068 ifa->ifa_local); 1069 if (gone && addr_type != RTN_LOCAL) { 1070 /* And the last, but not the least thing. 1071 * We must flush stray FIB entries. 1072 * 1073 * First of all, we scan fib_info list searching 1074 * for stray nexthop entries, then ignite fib_flush. 1075 */ 1076 if (fib_sync_down_addr(dev, ifa->ifa_local)) 1077 fib_flush(dev_net(dev)); 1078 } 1079 } 1080 #undef LOCAL_OK 1081 #undef BRD_OK 1082 #undef BRD0_OK 1083 #undef BRD1_OK 1084 } 1085 1086 static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) 1087 { 1088 1089 struct fib_result res; 1090 struct flowi4 fl4 = { 1091 .flowi4_mark = frn->fl_mark, 1092 .daddr = frn->fl_addr, 1093 .flowi4_tos = frn->fl_tos, 1094 .flowi4_scope = frn->fl_scope, 1095 }; 1096 struct fib_table *tb; 1097 1098 rcu_read_lock(); 1099 1100 tb = fib_get_table(net, frn->tb_id_in); 1101 1102 frn->err = -ENOENT; 1103 if (tb) { 1104 local_bh_disable(); 1105 1106 frn->tb_id = tb->tb_id; 1107 frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); 1108 1109 if (!frn->err) { 1110 frn->prefixlen = res.prefixlen; 1111 frn->nh_sel = res.nh_sel; 1112 frn->type = res.type; 1113 frn->scope = res.scope; 1114 } 1115 local_bh_enable(); 1116 } 1117 1118 rcu_read_unlock(); 1119 } 1120 1121 static void nl_fib_input(struct sk_buff *skb) 1122 { 1123 struct net *net; 1124 struct fib_result_nl *frn; 1125 struct nlmsghdr *nlh; 1126 u32 portid; 1127 1128 net = sock_net(skb->sk); 1129 nlh = nlmsg_hdr(skb); 1130 if (skb->len < nlmsg_total_size(sizeof(*frn)) || 1131 skb->len < nlh->nlmsg_len || 1132 nlmsg_len(nlh) < sizeof(*frn)) 1133 return; 1134 1135 skb = netlink_skb_clone(skb, GFP_KERNEL); 1136 if (!skb) 1137 return; 1138 nlh = nlmsg_hdr(skb); 1139 1140 frn = (struct fib_result_nl *) nlmsg_data(nlh); 1141 nl_fib_lookup(net, frn); 1142 1143 portid = NETLINK_CB(skb).portid; /* netlink portid */ 1144 NETLINK_CB(skb).portid = 0; /* from kernel */ 1145 NETLINK_CB(skb).dst_group = 0; /* unicast */ 1146 netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); 1147 } 1148 1149 static int __net_init nl_fib_lookup_init(struct net *net) 1150 { 1151 struct sock *sk; 1152 struct netlink_kernel_cfg cfg = { 1153 .input = nl_fib_input, 1154 }; 1155 1156 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); 1157 if (!sk) 1158 return -EAFNOSUPPORT; 1159 net->ipv4.fibnl = sk; 1160 return 0; 1161 } 1162 1163 static void nl_fib_lookup_exit(struct net *net) 1164 { 1165 netlink_kernel_release(net->ipv4.fibnl); 1166 net->ipv4.fibnl = NULL; 1167 } 1168 1169 static void fib_disable_ip(struct net_device *dev, unsigned long event, 1170 bool force) 1171 { 1172 if (fib_sync_down_dev(dev, event, force)) 1173 fib_flush(dev_net(dev)); 1174 else 1175 rt_cache_flush(dev_net(dev)); 1176 arp_ifdown(dev); 1177 } 1178 1179 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) 1180 { 1181 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 1182 struct net_device *dev = ifa->ifa_dev->dev; 1183 struct net *net = dev_net(dev); 1184 1185 switch (event) { 1186 case NETDEV_UP: 1187 fib_add_ifaddr(ifa); 1188 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1189 fib_sync_up(dev, RTNH_F_DEAD); 1190 #endif 1191 atomic_inc(&net->ipv4.dev_addr_genid); 1192 rt_cache_flush(dev_net(dev)); 1193 break; 1194 case NETDEV_DOWN: 1195 fib_del_ifaddr(ifa, NULL); 1196 atomic_inc(&net->ipv4.dev_addr_genid); 1197 if (!ifa->ifa_dev->ifa_list) { 1198 /* Last address was deleted from this interface. 1199 * Disable IP. 1200 */ 1201 fib_disable_ip(dev, event, true); 1202 } else { 1203 rt_cache_flush(dev_net(dev)); 1204 } 1205 break; 1206 } 1207 return NOTIFY_DONE; 1208 } 1209 1210 static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) 1211 { 1212 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1213 struct netdev_notifier_changeupper_info *info; 1214 struct in_device *in_dev; 1215 struct net *net = dev_net(dev); 1216 unsigned int flags; 1217 1218 if (event == NETDEV_UNREGISTER) { 1219 fib_disable_ip(dev, event, true); 1220 rt_flush_dev(dev); 1221 return NOTIFY_DONE; 1222 } 1223 1224 in_dev = __in_dev_get_rtnl(dev); 1225 if (!in_dev) 1226 return NOTIFY_DONE; 1227 1228 switch (event) { 1229 case NETDEV_UP: 1230 for_ifa(in_dev) { 1231 fib_add_ifaddr(ifa); 1232 } endfor_ifa(in_dev); 1233 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1234 fib_sync_up(dev, RTNH_F_DEAD); 1235 #endif 1236 atomic_inc(&net->ipv4.dev_addr_genid); 1237 rt_cache_flush(net); 1238 break; 1239 case NETDEV_DOWN: 1240 fib_disable_ip(dev, event, false); 1241 break; 1242 case NETDEV_CHANGE: 1243 flags = dev_get_flags(dev); 1244 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1245 fib_sync_up(dev, RTNH_F_LINKDOWN); 1246 else 1247 fib_sync_down_dev(dev, event, false); 1248 /* fall through */ 1249 case NETDEV_CHANGEMTU: 1250 rt_cache_flush(net); 1251 break; 1252 case NETDEV_CHANGEUPPER: 1253 info = ptr; 1254 /* flush all routes if dev is linked to or unlinked from 1255 * an L3 master device (e.g., VRF) 1256 */ 1257 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 1258 fib_disable_ip(dev, NETDEV_DOWN, true); 1259 break; 1260 } 1261 return NOTIFY_DONE; 1262 } 1263 1264 static struct notifier_block fib_inetaddr_notifier = { 1265 .notifier_call = fib_inetaddr_event, 1266 }; 1267 1268 static struct notifier_block fib_netdev_notifier = { 1269 .notifier_call = fib_netdev_event, 1270 }; 1271 1272 static int __net_init ip_fib_net_init(struct net *net) 1273 { 1274 int err; 1275 size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; 1276 1277 err = fib4_notifier_init(net); 1278 if (err) 1279 return err; 1280 1281 /* Avoid false sharing : Use at least a full cache line */ 1282 size = max_t(size_t, size, L1_CACHE_BYTES); 1283 1284 net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); 1285 if (!net->ipv4.fib_table_hash) { 1286 err = -ENOMEM; 1287 goto err_table_hash_alloc; 1288 } 1289 1290 err = fib4_rules_init(net); 1291 if (err < 0) 1292 goto err_rules_init; 1293 return 0; 1294 1295 err_rules_init: 1296 kfree(net->ipv4.fib_table_hash); 1297 err_table_hash_alloc: 1298 fib4_notifier_exit(net); 1299 return err; 1300 } 1301 1302 static void ip_fib_net_exit(struct net *net) 1303 { 1304 int i; 1305 1306 rtnl_lock(); 1307 #ifdef CONFIG_IP_MULTIPLE_TABLES 1308 RCU_INIT_POINTER(net->ipv4.fib_main, NULL); 1309 RCU_INIT_POINTER(net->ipv4.fib_default, NULL); 1310 #endif 1311 /* Destroy the tables in reverse order to guarantee that the 1312 * local table, ID 255, is destroyed before the main table, ID 1313 * 254. This is necessary as the local table may contain 1314 * references to data contained in the main table. 1315 */ 1316 for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) { 1317 struct hlist_head *head = &net->ipv4.fib_table_hash[i]; 1318 struct hlist_node *tmp; 1319 struct fib_table *tb; 1320 1321 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { 1322 hlist_del(&tb->tb_hlist); 1323 fib_table_flush(net, tb); 1324 fib_free_table(tb); 1325 } 1326 } 1327 1328 #ifdef CONFIG_IP_MULTIPLE_TABLES 1329 fib4_rules_exit(net); 1330 #endif 1331 rtnl_unlock(); 1332 kfree(net->ipv4.fib_table_hash); 1333 fib4_notifier_exit(net); 1334 } 1335 1336 static int __net_init fib_net_init(struct net *net) 1337 { 1338 int error; 1339 1340 #ifdef CONFIG_IP_ROUTE_CLASSID 1341 net->ipv4.fib_num_tclassid_users = 0; 1342 #endif 1343 error = ip_fib_net_init(net); 1344 if (error < 0) 1345 goto out; 1346 error = nl_fib_lookup_init(net); 1347 if (error < 0) 1348 goto out_nlfl; 1349 error = fib_proc_init(net); 1350 if (error < 0) 1351 goto out_proc; 1352 out: 1353 return error; 1354 1355 out_proc: 1356 nl_fib_lookup_exit(net); 1357 out_nlfl: 1358 ip_fib_net_exit(net); 1359 goto out; 1360 } 1361 1362 static void __net_exit fib_net_exit(struct net *net) 1363 { 1364 fib_proc_exit(net); 1365 nl_fib_lookup_exit(net); 1366 ip_fib_net_exit(net); 1367 } 1368 1369 static struct pernet_operations fib_net_ops = { 1370 .init = fib_net_init, 1371 .exit = fib_net_exit, 1372 }; 1373 1374 void __init ip_fib_init(void) 1375 { 1376 fib_trie_init(); 1377 1378 register_pernet_subsys(&fib_net_ops); 1379 1380 register_netdevice_notifier(&fib_netdev_notifier); 1381 register_inetaddr_notifier(&fib_inetaddr_notifier); 1382 1383 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0); 1384 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0); 1385 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0); 1386 } 1387