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_IP_PROTO] = { .type = NLA_U8 }, 653 [RTA_SPORT] = { .type = NLA_U16 }, 654 [RTA_DPORT] = { .type = NLA_U16 }, 655 }; 656 657 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, 658 struct nlmsghdr *nlh, struct fib_config *cfg, 659 struct netlink_ext_ack *extack) 660 { 661 struct nlattr *attr; 662 int err, remaining; 663 struct rtmsg *rtm; 664 665 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy, 666 extack); 667 if (err < 0) 668 goto errout; 669 670 memset(cfg, 0, sizeof(*cfg)); 671 672 rtm = nlmsg_data(nlh); 673 cfg->fc_dst_len = rtm->rtm_dst_len; 674 cfg->fc_tos = rtm->rtm_tos; 675 cfg->fc_table = rtm->rtm_table; 676 cfg->fc_protocol = rtm->rtm_protocol; 677 cfg->fc_scope = rtm->rtm_scope; 678 cfg->fc_type = rtm->rtm_type; 679 cfg->fc_flags = rtm->rtm_flags; 680 cfg->fc_nlflags = nlh->nlmsg_flags; 681 682 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; 683 cfg->fc_nlinfo.nlh = nlh; 684 cfg->fc_nlinfo.nl_net = net; 685 686 if (cfg->fc_type > RTN_MAX) { 687 NL_SET_ERR_MSG(extack, "Invalid route type"); 688 err = -EINVAL; 689 goto errout; 690 } 691 692 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { 693 switch (nla_type(attr)) { 694 case RTA_DST: 695 cfg->fc_dst = nla_get_be32(attr); 696 break; 697 case RTA_OIF: 698 cfg->fc_oif = nla_get_u32(attr); 699 break; 700 case RTA_GATEWAY: 701 cfg->fc_gw = nla_get_be32(attr); 702 break; 703 case RTA_PRIORITY: 704 cfg->fc_priority = nla_get_u32(attr); 705 break; 706 case RTA_PREFSRC: 707 cfg->fc_prefsrc = nla_get_be32(attr); 708 break; 709 case RTA_METRICS: 710 cfg->fc_mx = nla_data(attr); 711 cfg->fc_mx_len = nla_len(attr); 712 break; 713 case RTA_MULTIPATH: 714 err = lwtunnel_valid_encap_type_attr(nla_data(attr), 715 nla_len(attr), 716 extack); 717 if (err < 0) 718 goto errout; 719 cfg->fc_mp = nla_data(attr); 720 cfg->fc_mp_len = nla_len(attr); 721 break; 722 case RTA_FLOW: 723 cfg->fc_flow = nla_get_u32(attr); 724 break; 725 case RTA_TABLE: 726 cfg->fc_table = nla_get_u32(attr); 727 break; 728 case RTA_ENCAP: 729 cfg->fc_encap = attr; 730 break; 731 case RTA_ENCAP_TYPE: 732 cfg->fc_encap_type = nla_get_u16(attr); 733 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, 734 extack); 735 if (err < 0) 736 goto errout; 737 break; 738 } 739 } 740 741 return 0; 742 errout: 743 return err; 744 } 745 746 static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 747 struct netlink_ext_ack *extack) 748 { 749 struct net *net = sock_net(skb->sk); 750 struct fib_config cfg; 751 struct fib_table *tb; 752 int err; 753 754 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); 755 if (err < 0) 756 goto errout; 757 758 tb = fib_get_table(net, cfg.fc_table); 759 if (!tb) { 760 NL_SET_ERR_MSG(extack, "FIB table does not exist"); 761 err = -ESRCH; 762 goto errout; 763 } 764 765 err = fib_table_delete(net, tb, &cfg, extack); 766 errout: 767 return err; 768 } 769 770 static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 771 struct netlink_ext_ack *extack) 772 { 773 struct net *net = sock_net(skb->sk); 774 struct fib_config cfg; 775 struct fib_table *tb; 776 int err; 777 778 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); 779 if (err < 0) 780 goto errout; 781 782 tb = fib_new_table(net, cfg.fc_table); 783 if (!tb) { 784 err = -ENOBUFS; 785 goto errout; 786 } 787 788 err = fib_table_insert(net, tb, &cfg, extack); 789 if (!err && cfg.fc_type == RTN_LOCAL) 790 net->ipv4.fib_has_custom_local_routes = true; 791 errout: 792 return err; 793 } 794 795 static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) 796 { 797 struct net *net = sock_net(skb->sk); 798 unsigned int h, s_h; 799 unsigned int e = 0, s_e; 800 struct fib_table *tb; 801 struct hlist_head *head; 802 int dumped = 0, err; 803 804 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && 805 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) 806 return skb->len; 807 808 s_h = cb->args[0]; 809 s_e = cb->args[1]; 810 811 rcu_read_lock(); 812 813 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { 814 e = 0; 815 head = &net->ipv4.fib_table_hash[h]; 816 hlist_for_each_entry_rcu(tb, head, tb_hlist) { 817 if (e < s_e) 818 goto next; 819 if (dumped) 820 memset(&cb->args[2], 0, sizeof(cb->args) - 821 2 * sizeof(cb->args[0])); 822 err = fib_table_dump(tb, skb, cb); 823 if (err < 0) { 824 if (likely(skb->len)) 825 goto out; 826 827 goto out_err; 828 } 829 dumped = 1; 830 next: 831 e++; 832 } 833 } 834 out: 835 err = skb->len; 836 out_err: 837 rcu_read_unlock(); 838 839 cb->args[1] = e; 840 cb->args[0] = h; 841 842 return err; 843 } 844 845 /* Prepare and feed intra-kernel routing request. 846 * Really, it should be netlink message, but :-( netlink 847 * can be not configured, so that we feed it directly 848 * to fib engine. It is legal, because all events occur 849 * only when netlink is already locked. 850 */ 851 static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) 852 { 853 struct net *net = dev_net(ifa->ifa_dev->dev); 854 u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); 855 struct fib_table *tb; 856 struct fib_config cfg = { 857 .fc_protocol = RTPROT_KERNEL, 858 .fc_type = type, 859 .fc_dst = dst, 860 .fc_dst_len = dst_len, 861 .fc_prefsrc = ifa->ifa_local, 862 .fc_oif = ifa->ifa_dev->dev->ifindex, 863 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, 864 .fc_nlinfo = { 865 .nl_net = net, 866 }, 867 }; 868 869 if (!tb_id) 870 tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; 871 872 tb = fib_new_table(net, tb_id); 873 if (!tb) 874 return; 875 876 cfg.fc_table = tb->tb_id; 877 878 if (type != RTN_LOCAL) 879 cfg.fc_scope = RT_SCOPE_LINK; 880 else 881 cfg.fc_scope = RT_SCOPE_HOST; 882 883 if (cmd == RTM_NEWROUTE) 884 fib_table_insert(net, tb, &cfg, NULL); 885 else 886 fib_table_delete(net, tb, &cfg, NULL); 887 } 888 889 void fib_add_ifaddr(struct in_ifaddr *ifa) 890 { 891 struct in_device *in_dev = ifa->ifa_dev; 892 struct net_device *dev = in_dev->dev; 893 struct in_ifaddr *prim = ifa; 894 __be32 mask = ifa->ifa_mask; 895 __be32 addr = ifa->ifa_local; 896 __be32 prefix = ifa->ifa_address & mask; 897 898 if (ifa->ifa_flags & IFA_F_SECONDARY) { 899 prim = inet_ifa_byprefix(in_dev, prefix, mask); 900 if (!prim) { 901 pr_warn("%s: bug: prim == NULL\n", __func__); 902 return; 903 } 904 } 905 906 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); 907 908 if (!(dev->flags & IFF_UP)) 909 return; 910 911 /* Add broadcast address, if it is explicitly assigned. */ 912 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) 913 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); 914 915 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && 916 (prefix != addr || ifa->ifa_prefixlen < 32)) { 917 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) 918 fib_magic(RTM_NEWROUTE, 919 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, 920 prefix, ifa->ifa_prefixlen, prim); 921 922 /* Add network specific broadcasts, when it takes a sense */ 923 if (ifa->ifa_prefixlen < 31) { 924 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); 925 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, 926 32, prim); 927 } 928 } 929 } 930 931 /* Delete primary or secondary address. 932 * Optionally, on secondary address promotion consider the addresses 933 * from subnet iprim as deleted, even if they are in device list. 934 * In this case the secondary ifa can be in device list. 935 */ 936 void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) 937 { 938 struct in_device *in_dev = ifa->ifa_dev; 939 struct net_device *dev = in_dev->dev; 940 struct in_ifaddr *ifa1; 941 struct in_ifaddr *prim = ifa, *prim1 = NULL; 942 __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; 943 __be32 any = ifa->ifa_address & ifa->ifa_mask; 944 #define LOCAL_OK 1 945 #define BRD_OK 2 946 #define BRD0_OK 4 947 #define BRD1_OK 8 948 unsigned int ok = 0; 949 int subnet = 0; /* Primary network */ 950 int gone = 1; /* Address is missing */ 951 int same_prefsrc = 0; /* Another primary with same IP */ 952 953 if (ifa->ifa_flags & IFA_F_SECONDARY) { 954 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); 955 if (!prim) { 956 /* if the device has been deleted, we don't perform 957 * address promotion 958 */ 959 if (!in_dev->dead) 960 pr_warn("%s: bug: prim == NULL\n", __func__); 961 return; 962 } 963 if (iprim && iprim != prim) { 964 pr_warn("%s: bug: iprim != prim\n", __func__); 965 return; 966 } 967 } else if (!ipv4_is_zeronet(any) && 968 (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { 969 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) 970 fib_magic(RTM_DELROUTE, 971 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, 972 any, ifa->ifa_prefixlen, prim); 973 subnet = 1; 974 } 975 976 if (in_dev->dead) 977 goto no_promotions; 978 979 /* Deletion is more complicated than add. 980 * We should take care of not to delete too much :-) 981 * 982 * Scan address list to be sure that addresses are really gone. 983 */ 984 985 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { 986 if (ifa1 == ifa) { 987 /* promotion, keep the IP */ 988 gone = 0; 989 continue; 990 } 991 /* Ignore IFAs from our subnet */ 992 if (iprim && ifa1->ifa_mask == iprim->ifa_mask && 993 inet_ifa_match(ifa1->ifa_address, iprim)) 994 continue; 995 996 /* Ignore ifa1 if it uses different primary IP (prefsrc) */ 997 if (ifa1->ifa_flags & IFA_F_SECONDARY) { 998 /* Another address from our subnet? */ 999 if (ifa1->ifa_mask == prim->ifa_mask && 1000 inet_ifa_match(ifa1->ifa_address, prim)) 1001 prim1 = prim; 1002 else { 1003 /* We reached the secondaries, so 1004 * same_prefsrc should be determined. 1005 */ 1006 if (!same_prefsrc) 1007 continue; 1008 /* Search new prim1 if ifa1 is not 1009 * using the current prim1 1010 */ 1011 if (!prim1 || 1012 ifa1->ifa_mask != prim1->ifa_mask || 1013 !inet_ifa_match(ifa1->ifa_address, prim1)) 1014 prim1 = inet_ifa_byprefix(in_dev, 1015 ifa1->ifa_address, 1016 ifa1->ifa_mask); 1017 if (!prim1) 1018 continue; 1019 if (prim1->ifa_local != prim->ifa_local) 1020 continue; 1021 } 1022 } else { 1023 if (prim->ifa_local != ifa1->ifa_local) 1024 continue; 1025 prim1 = ifa1; 1026 if (prim != prim1) 1027 same_prefsrc = 1; 1028 } 1029 if (ifa->ifa_local == ifa1->ifa_local) 1030 ok |= LOCAL_OK; 1031 if (ifa->ifa_broadcast == ifa1->ifa_broadcast) 1032 ok |= BRD_OK; 1033 if (brd == ifa1->ifa_broadcast) 1034 ok |= BRD1_OK; 1035 if (any == ifa1->ifa_broadcast) 1036 ok |= BRD0_OK; 1037 /* primary has network specific broadcasts */ 1038 if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { 1039 __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; 1040 __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; 1041 1042 if (!ipv4_is_zeronet(any1)) { 1043 if (ifa->ifa_broadcast == brd1 || 1044 ifa->ifa_broadcast == any1) 1045 ok |= BRD_OK; 1046 if (brd == brd1 || brd == any1) 1047 ok |= BRD1_OK; 1048 if (any == brd1 || any == any1) 1049 ok |= BRD0_OK; 1050 } 1051 } 1052 } 1053 1054 no_promotions: 1055 if (!(ok & BRD_OK)) 1056 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); 1057 if (subnet && ifa->ifa_prefixlen < 31) { 1058 if (!(ok & BRD1_OK)) 1059 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); 1060 if (!(ok & BRD0_OK)) 1061 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); 1062 } 1063 if (!(ok & LOCAL_OK)) { 1064 unsigned int addr_type; 1065 1066 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); 1067 1068 /* Check, that this local address finally disappeared. */ 1069 addr_type = inet_addr_type_dev_table(dev_net(dev), dev, 1070 ifa->ifa_local); 1071 if (gone && addr_type != RTN_LOCAL) { 1072 /* And the last, but not the least thing. 1073 * We must flush stray FIB entries. 1074 * 1075 * First of all, we scan fib_info list searching 1076 * for stray nexthop entries, then ignite fib_flush. 1077 */ 1078 if (fib_sync_down_addr(dev, ifa->ifa_local)) 1079 fib_flush(dev_net(dev)); 1080 } 1081 } 1082 #undef LOCAL_OK 1083 #undef BRD_OK 1084 #undef BRD0_OK 1085 #undef BRD1_OK 1086 } 1087 1088 static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) 1089 { 1090 1091 struct fib_result res; 1092 struct flowi4 fl4 = { 1093 .flowi4_mark = frn->fl_mark, 1094 .daddr = frn->fl_addr, 1095 .flowi4_tos = frn->fl_tos, 1096 .flowi4_scope = frn->fl_scope, 1097 }; 1098 struct fib_table *tb; 1099 1100 rcu_read_lock(); 1101 1102 tb = fib_get_table(net, frn->tb_id_in); 1103 1104 frn->err = -ENOENT; 1105 if (tb) { 1106 local_bh_disable(); 1107 1108 frn->tb_id = tb->tb_id; 1109 frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); 1110 1111 if (!frn->err) { 1112 frn->prefixlen = res.prefixlen; 1113 frn->nh_sel = res.nh_sel; 1114 frn->type = res.type; 1115 frn->scope = res.scope; 1116 } 1117 local_bh_enable(); 1118 } 1119 1120 rcu_read_unlock(); 1121 } 1122 1123 static void nl_fib_input(struct sk_buff *skb) 1124 { 1125 struct net *net; 1126 struct fib_result_nl *frn; 1127 struct nlmsghdr *nlh; 1128 u32 portid; 1129 1130 net = sock_net(skb->sk); 1131 nlh = nlmsg_hdr(skb); 1132 if (skb->len < nlmsg_total_size(sizeof(*frn)) || 1133 skb->len < nlh->nlmsg_len || 1134 nlmsg_len(nlh) < sizeof(*frn)) 1135 return; 1136 1137 skb = netlink_skb_clone(skb, GFP_KERNEL); 1138 if (!skb) 1139 return; 1140 nlh = nlmsg_hdr(skb); 1141 1142 frn = (struct fib_result_nl *) nlmsg_data(nlh); 1143 nl_fib_lookup(net, frn); 1144 1145 portid = NETLINK_CB(skb).portid; /* netlink portid */ 1146 NETLINK_CB(skb).portid = 0; /* from kernel */ 1147 NETLINK_CB(skb).dst_group = 0; /* unicast */ 1148 netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); 1149 } 1150 1151 static int __net_init nl_fib_lookup_init(struct net *net) 1152 { 1153 struct sock *sk; 1154 struct netlink_kernel_cfg cfg = { 1155 .input = nl_fib_input, 1156 }; 1157 1158 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); 1159 if (!sk) 1160 return -EAFNOSUPPORT; 1161 net->ipv4.fibnl = sk; 1162 return 0; 1163 } 1164 1165 static void nl_fib_lookup_exit(struct net *net) 1166 { 1167 netlink_kernel_release(net->ipv4.fibnl); 1168 net->ipv4.fibnl = NULL; 1169 } 1170 1171 static void fib_disable_ip(struct net_device *dev, unsigned long event, 1172 bool force) 1173 { 1174 if (fib_sync_down_dev(dev, event, force)) 1175 fib_flush(dev_net(dev)); 1176 else 1177 rt_cache_flush(dev_net(dev)); 1178 arp_ifdown(dev); 1179 } 1180 1181 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) 1182 { 1183 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 1184 struct net_device *dev = ifa->ifa_dev->dev; 1185 struct net *net = dev_net(dev); 1186 1187 switch (event) { 1188 case NETDEV_UP: 1189 fib_add_ifaddr(ifa); 1190 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1191 fib_sync_up(dev, RTNH_F_DEAD); 1192 #endif 1193 atomic_inc(&net->ipv4.dev_addr_genid); 1194 rt_cache_flush(dev_net(dev)); 1195 break; 1196 case NETDEV_DOWN: 1197 fib_del_ifaddr(ifa, NULL); 1198 atomic_inc(&net->ipv4.dev_addr_genid); 1199 if (!ifa->ifa_dev->ifa_list) { 1200 /* Last address was deleted from this interface. 1201 * Disable IP. 1202 */ 1203 fib_disable_ip(dev, event, true); 1204 } else { 1205 rt_cache_flush(dev_net(dev)); 1206 } 1207 break; 1208 } 1209 return NOTIFY_DONE; 1210 } 1211 1212 static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) 1213 { 1214 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1215 struct netdev_notifier_changeupper_info *info; 1216 struct in_device *in_dev; 1217 struct net *net = dev_net(dev); 1218 unsigned int flags; 1219 1220 if (event == NETDEV_UNREGISTER) { 1221 fib_disable_ip(dev, event, true); 1222 rt_flush_dev(dev); 1223 return NOTIFY_DONE; 1224 } 1225 1226 in_dev = __in_dev_get_rtnl(dev); 1227 if (!in_dev) 1228 return NOTIFY_DONE; 1229 1230 switch (event) { 1231 case NETDEV_UP: 1232 for_ifa(in_dev) { 1233 fib_add_ifaddr(ifa); 1234 } endfor_ifa(in_dev); 1235 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1236 fib_sync_up(dev, RTNH_F_DEAD); 1237 #endif 1238 atomic_inc(&net->ipv4.dev_addr_genid); 1239 rt_cache_flush(net); 1240 break; 1241 case NETDEV_DOWN: 1242 fib_disable_ip(dev, event, false); 1243 break; 1244 case NETDEV_CHANGE: 1245 flags = dev_get_flags(dev); 1246 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1247 fib_sync_up(dev, RTNH_F_LINKDOWN); 1248 else 1249 fib_sync_down_dev(dev, event, false); 1250 /* fall through */ 1251 case NETDEV_CHANGEMTU: 1252 rt_cache_flush(net); 1253 break; 1254 case NETDEV_CHANGEUPPER: 1255 info = ptr; 1256 /* flush all routes if dev is linked to or unlinked from 1257 * an L3 master device (e.g., VRF) 1258 */ 1259 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 1260 fib_disable_ip(dev, NETDEV_DOWN, true); 1261 break; 1262 } 1263 return NOTIFY_DONE; 1264 } 1265 1266 static struct notifier_block fib_inetaddr_notifier = { 1267 .notifier_call = fib_inetaddr_event, 1268 }; 1269 1270 static struct notifier_block fib_netdev_notifier = { 1271 .notifier_call = fib_netdev_event, 1272 }; 1273 1274 static int __net_init ip_fib_net_init(struct net *net) 1275 { 1276 int err; 1277 size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; 1278 1279 err = fib4_notifier_init(net); 1280 if (err) 1281 return err; 1282 1283 /* Avoid false sharing : Use at least a full cache line */ 1284 size = max_t(size_t, size, L1_CACHE_BYTES); 1285 1286 net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); 1287 if (!net->ipv4.fib_table_hash) { 1288 err = -ENOMEM; 1289 goto err_table_hash_alloc; 1290 } 1291 1292 err = fib4_rules_init(net); 1293 if (err < 0) 1294 goto err_rules_init; 1295 return 0; 1296 1297 err_rules_init: 1298 kfree(net->ipv4.fib_table_hash); 1299 err_table_hash_alloc: 1300 fib4_notifier_exit(net); 1301 return err; 1302 } 1303 1304 static void ip_fib_net_exit(struct net *net) 1305 { 1306 int i; 1307 1308 rtnl_lock(); 1309 #ifdef CONFIG_IP_MULTIPLE_TABLES 1310 RCU_INIT_POINTER(net->ipv4.fib_main, NULL); 1311 RCU_INIT_POINTER(net->ipv4.fib_default, NULL); 1312 #endif 1313 /* Destroy the tables in reverse order to guarantee that the 1314 * local table, ID 255, is destroyed before the main table, ID 1315 * 254. This is necessary as the local table may contain 1316 * references to data contained in the main table. 1317 */ 1318 for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) { 1319 struct hlist_head *head = &net->ipv4.fib_table_hash[i]; 1320 struct hlist_node *tmp; 1321 struct fib_table *tb; 1322 1323 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { 1324 hlist_del(&tb->tb_hlist); 1325 fib_table_flush(net, tb); 1326 fib_free_table(tb); 1327 } 1328 } 1329 1330 #ifdef CONFIG_IP_MULTIPLE_TABLES 1331 fib4_rules_exit(net); 1332 #endif 1333 rtnl_unlock(); 1334 kfree(net->ipv4.fib_table_hash); 1335 fib4_notifier_exit(net); 1336 } 1337 1338 static int __net_init fib_net_init(struct net *net) 1339 { 1340 int error; 1341 1342 #ifdef CONFIG_IP_ROUTE_CLASSID 1343 net->ipv4.fib_num_tclassid_users = 0; 1344 #endif 1345 error = ip_fib_net_init(net); 1346 if (error < 0) 1347 goto out; 1348 error = nl_fib_lookup_init(net); 1349 if (error < 0) 1350 goto out_nlfl; 1351 error = fib_proc_init(net); 1352 if (error < 0) 1353 goto out_proc; 1354 out: 1355 return error; 1356 1357 out_proc: 1358 nl_fib_lookup_exit(net); 1359 out_nlfl: 1360 ip_fib_net_exit(net); 1361 goto out; 1362 } 1363 1364 static void __net_exit fib_net_exit(struct net *net) 1365 { 1366 fib_proc_exit(net); 1367 nl_fib_lookup_exit(net); 1368 ip_fib_net_exit(net); 1369 } 1370 1371 static struct pernet_operations fib_net_ops = { 1372 .init = fib_net_init, 1373 .exit = fib_net_exit, 1374 }; 1375 1376 void __init ip_fib_init(void) 1377 { 1378 fib_trie_init(); 1379 1380 register_pernet_subsys(&fib_net_ops); 1381 1382 register_netdevice_notifier(&fib_netdev_notifier); 1383 register_inetaddr_notifier(&fib_inetaddr_notifier); 1384 1385 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0); 1386 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0); 1387 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0); 1388 } 1389