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 int ret, no_addr; 330 struct fib_result res; 331 struct flowi4 fl4; 332 struct net *net = dev_net(dev); 333 bool dev_match; 334 335 fl4.flowi4_oif = 0; 336 fl4.flowi4_iif = l3mdev_master_ifindex_rcu(dev); 337 if (!fl4.flowi4_iif) 338 fl4.flowi4_iif = oif ? : LOOPBACK_IFINDEX; 339 fl4.daddr = src; 340 fl4.saddr = dst; 341 fl4.flowi4_tos = tos; 342 fl4.flowi4_scope = RT_SCOPE_UNIVERSE; 343 fl4.flowi4_tun_key.tun_id = 0; 344 fl4.flowi4_flags = 0; 345 fl4.flowi4_uid = sock_net_uid(net, NULL); 346 347 no_addr = idev->ifa_list == NULL; 348 349 fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0; 350 351 trace_fib_validate_source(dev, &fl4); 352 353 if (fib_lookup(net, &fl4, &res, 0)) 354 goto last_resort; 355 if (res.type != RTN_UNICAST && 356 (res.type != RTN_LOCAL || !IN_DEV_ACCEPT_LOCAL(idev))) 357 goto e_inval; 358 fib_combine_itag(itag, &res); 359 dev_match = false; 360 361 #ifdef CONFIG_IP_ROUTE_MULTIPATH 362 for (ret = 0; ret < res.fi->fib_nhs; ret++) { 363 struct fib_nh *nh = &res.fi->fib_nh[ret]; 364 365 if (nh->nh_dev == dev) { 366 dev_match = true; 367 break; 368 } else if (l3mdev_master_ifindex_rcu(nh->nh_dev) == dev->ifindex) { 369 dev_match = true; 370 break; 371 } 372 } 373 #else 374 if (FIB_RES_DEV(res) == dev) 375 dev_match = true; 376 #endif 377 if (dev_match) { 378 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; 379 return ret; 380 } 381 if (no_addr) 382 goto last_resort; 383 if (rpf == 1) 384 goto e_rpf; 385 fl4.flowi4_oif = dev->ifindex; 386 387 ret = 0; 388 if (fib_lookup(net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE) == 0) { 389 if (res.type == RTN_UNICAST) 390 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; 391 } 392 return ret; 393 394 last_resort: 395 if (rpf) 396 goto e_rpf; 397 *itag = 0; 398 return 0; 399 400 e_inval: 401 return -EINVAL; 402 e_rpf: 403 return -EXDEV; 404 } 405 406 /* Ignore rp_filter for packets protected by IPsec. */ 407 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst, 408 u8 tos, int oif, struct net_device *dev, 409 struct in_device *idev, u32 *itag) 410 { 411 int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev); 412 struct net *net = dev_net(dev); 413 414 if (!r && !fib_num_tclassid_users(net) && 415 (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) { 416 if (IN_DEV_ACCEPT_LOCAL(idev)) 417 goto ok; 418 /* with custom local routes in place, checking local addresses 419 * only will be too optimistic, with custom rules, checking 420 * local addresses only can be too strict, e.g. due to vrf 421 */ 422 if (net->ipv4.fib_has_custom_local_routes || 423 fib4_has_custom_rules(net)) 424 goto full_check; 425 if (inet_lookup_ifaddr_rcu(net, src)) 426 return -EINVAL; 427 428 ok: 429 *itag = 0; 430 return 0; 431 } 432 433 full_check: 434 return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag); 435 } 436 437 static inline __be32 sk_extract_addr(struct sockaddr *addr) 438 { 439 return ((struct sockaddr_in *) addr)->sin_addr.s_addr; 440 } 441 442 static int put_rtax(struct nlattr *mx, int len, int type, u32 value) 443 { 444 struct nlattr *nla; 445 446 nla = (struct nlattr *) ((char *) mx + len); 447 nla->nla_type = type; 448 nla->nla_len = nla_attr_size(4); 449 *(u32 *) nla_data(nla) = value; 450 451 return len + nla_total_size(4); 452 } 453 454 static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, 455 struct fib_config *cfg) 456 { 457 __be32 addr; 458 int plen; 459 460 memset(cfg, 0, sizeof(*cfg)); 461 cfg->fc_nlinfo.nl_net = net; 462 463 if (rt->rt_dst.sa_family != AF_INET) 464 return -EAFNOSUPPORT; 465 466 /* 467 * Check mask for validity: 468 * a) it must be contiguous. 469 * b) destination must have all host bits clear. 470 * c) if application forgot to set correct family (AF_INET), 471 * reject request unless it is absolutely clear i.e. 472 * both family and mask are zero. 473 */ 474 plen = 32; 475 addr = sk_extract_addr(&rt->rt_dst); 476 if (!(rt->rt_flags & RTF_HOST)) { 477 __be32 mask = sk_extract_addr(&rt->rt_genmask); 478 479 if (rt->rt_genmask.sa_family != AF_INET) { 480 if (mask || rt->rt_genmask.sa_family) 481 return -EAFNOSUPPORT; 482 } 483 484 if (bad_mask(mask, addr)) 485 return -EINVAL; 486 487 plen = inet_mask_len(mask); 488 } 489 490 cfg->fc_dst_len = plen; 491 cfg->fc_dst = addr; 492 493 if (cmd != SIOCDELRT) { 494 cfg->fc_nlflags = NLM_F_CREATE; 495 cfg->fc_protocol = RTPROT_BOOT; 496 } 497 498 if (rt->rt_metric) 499 cfg->fc_priority = rt->rt_metric - 1; 500 501 if (rt->rt_flags & RTF_REJECT) { 502 cfg->fc_scope = RT_SCOPE_HOST; 503 cfg->fc_type = RTN_UNREACHABLE; 504 return 0; 505 } 506 507 cfg->fc_scope = RT_SCOPE_NOWHERE; 508 cfg->fc_type = RTN_UNICAST; 509 510 if (rt->rt_dev) { 511 char *colon; 512 struct net_device *dev; 513 char devname[IFNAMSIZ]; 514 515 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) 516 return -EFAULT; 517 518 devname[IFNAMSIZ-1] = 0; 519 colon = strchr(devname, ':'); 520 if (colon) 521 *colon = 0; 522 dev = __dev_get_by_name(net, devname); 523 if (!dev) 524 return -ENODEV; 525 cfg->fc_oif = dev->ifindex; 526 cfg->fc_table = l3mdev_fib_table(dev); 527 if (colon) { 528 struct in_ifaddr *ifa; 529 struct in_device *in_dev = __in_dev_get_rtnl(dev); 530 if (!in_dev) 531 return -ENODEV; 532 *colon = ':'; 533 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) 534 if (strcmp(ifa->ifa_label, devname) == 0) 535 break; 536 if (!ifa) 537 return -ENODEV; 538 cfg->fc_prefsrc = ifa->ifa_local; 539 } 540 } 541 542 addr = sk_extract_addr(&rt->rt_gateway); 543 if (rt->rt_gateway.sa_family == AF_INET && addr) { 544 unsigned int addr_type; 545 546 cfg->fc_gw = addr; 547 addr_type = inet_addr_type_table(net, addr, cfg->fc_table); 548 if (rt->rt_flags & RTF_GATEWAY && 549 addr_type == RTN_UNICAST) 550 cfg->fc_scope = RT_SCOPE_UNIVERSE; 551 } 552 553 if (cmd == SIOCDELRT) 554 return 0; 555 556 if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) 557 return -EINVAL; 558 559 if (cfg->fc_scope == RT_SCOPE_NOWHERE) 560 cfg->fc_scope = RT_SCOPE_LINK; 561 562 if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { 563 struct nlattr *mx; 564 int len = 0; 565 566 mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); 567 if (!mx) 568 return -ENOMEM; 569 570 if (rt->rt_flags & RTF_MTU) 571 len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); 572 573 if (rt->rt_flags & RTF_WINDOW) 574 len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); 575 576 if (rt->rt_flags & RTF_IRTT) 577 len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); 578 579 cfg->fc_mx = mx; 580 cfg->fc_mx_len = len; 581 } 582 583 return 0; 584 } 585 586 /* 587 * Handle IP routing ioctl calls. 588 * These are used to manipulate the routing tables 589 */ 590 int ip_rt_ioctl(struct net *net, unsigned int cmd, struct rtentry *rt) 591 { 592 struct fib_config cfg; 593 int err; 594 595 switch (cmd) { 596 case SIOCADDRT: /* Add a route */ 597 case SIOCDELRT: /* Delete a route */ 598 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 599 return -EPERM; 600 601 rtnl_lock(); 602 err = rtentry_to_fib_config(net, cmd, rt, &cfg); 603 if (err == 0) { 604 struct fib_table *tb; 605 606 if (cmd == SIOCDELRT) { 607 tb = fib_get_table(net, cfg.fc_table); 608 if (tb) 609 err = fib_table_delete(net, tb, &cfg, 610 NULL); 611 else 612 err = -ESRCH; 613 } else { 614 tb = fib_new_table(net, cfg.fc_table); 615 if (tb) 616 err = fib_table_insert(net, tb, 617 &cfg, NULL); 618 else 619 err = -ENOBUFS; 620 } 621 622 /* allocated by rtentry_to_fib_config() */ 623 kfree(cfg.fc_mx); 624 } 625 rtnl_unlock(); 626 return err; 627 } 628 return -EINVAL; 629 } 630 631 const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { 632 [RTA_DST] = { .type = NLA_U32 }, 633 [RTA_SRC] = { .type = NLA_U32 }, 634 [RTA_IIF] = { .type = NLA_U32 }, 635 [RTA_OIF] = { .type = NLA_U32 }, 636 [RTA_GATEWAY] = { .type = NLA_U32 }, 637 [RTA_PRIORITY] = { .type = NLA_U32 }, 638 [RTA_PREFSRC] = { .type = NLA_U32 }, 639 [RTA_METRICS] = { .type = NLA_NESTED }, 640 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, 641 [RTA_FLOW] = { .type = NLA_U32 }, 642 [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, 643 [RTA_ENCAP] = { .type = NLA_NESTED }, 644 [RTA_UID] = { .type = NLA_U32 }, 645 [RTA_MARK] = { .type = NLA_U32 }, 646 }; 647 648 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, 649 struct nlmsghdr *nlh, struct fib_config *cfg, 650 struct netlink_ext_ack *extack) 651 { 652 struct nlattr *attr; 653 int err, remaining; 654 struct rtmsg *rtm; 655 656 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy, 657 extack); 658 if (err < 0) 659 goto errout; 660 661 memset(cfg, 0, sizeof(*cfg)); 662 663 rtm = nlmsg_data(nlh); 664 cfg->fc_dst_len = rtm->rtm_dst_len; 665 cfg->fc_tos = rtm->rtm_tos; 666 cfg->fc_table = rtm->rtm_table; 667 cfg->fc_protocol = rtm->rtm_protocol; 668 cfg->fc_scope = rtm->rtm_scope; 669 cfg->fc_type = rtm->rtm_type; 670 cfg->fc_flags = rtm->rtm_flags; 671 cfg->fc_nlflags = nlh->nlmsg_flags; 672 673 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; 674 cfg->fc_nlinfo.nlh = nlh; 675 cfg->fc_nlinfo.nl_net = net; 676 677 if (cfg->fc_type > RTN_MAX) { 678 NL_SET_ERR_MSG(extack, "Invalid route type"); 679 err = -EINVAL; 680 goto errout; 681 } 682 683 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { 684 switch (nla_type(attr)) { 685 case RTA_DST: 686 cfg->fc_dst = nla_get_be32(attr); 687 break; 688 case RTA_OIF: 689 cfg->fc_oif = nla_get_u32(attr); 690 break; 691 case RTA_GATEWAY: 692 cfg->fc_gw = nla_get_be32(attr); 693 break; 694 case RTA_PRIORITY: 695 cfg->fc_priority = nla_get_u32(attr); 696 break; 697 case RTA_PREFSRC: 698 cfg->fc_prefsrc = nla_get_be32(attr); 699 break; 700 case RTA_METRICS: 701 cfg->fc_mx = nla_data(attr); 702 cfg->fc_mx_len = nla_len(attr); 703 break; 704 case RTA_MULTIPATH: 705 err = lwtunnel_valid_encap_type_attr(nla_data(attr), 706 nla_len(attr), 707 extack); 708 if (err < 0) 709 goto errout; 710 cfg->fc_mp = nla_data(attr); 711 cfg->fc_mp_len = nla_len(attr); 712 break; 713 case RTA_FLOW: 714 cfg->fc_flow = nla_get_u32(attr); 715 break; 716 case RTA_TABLE: 717 cfg->fc_table = nla_get_u32(attr); 718 break; 719 case RTA_ENCAP: 720 cfg->fc_encap = attr; 721 break; 722 case RTA_ENCAP_TYPE: 723 cfg->fc_encap_type = nla_get_u16(attr); 724 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, 725 extack); 726 if (err < 0) 727 goto errout; 728 break; 729 } 730 } 731 732 return 0; 733 errout: 734 return err; 735 } 736 737 static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 738 struct netlink_ext_ack *extack) 739 { 740 struct net *net = sock_net(skb->sk); 741 struct fib_config cfg; 742 struct fib_table *tb; 743 int err; 744 745 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); 746 if (err < 0) 747 goto errout; 748 749 tb = fib_get_table(net, cfg.fc_table); 750 if (!tb) { 751 NL_SET_ERR_MSG(extack, "FIB table does not exist"); 752 err = -ESRCH; 753 goto errout; 754 } 755 756 err = fib_table_delete(net, tb, &cfg, extack); 757 errout: 758 return err; 759 } 760 761 static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 762 struct netlink_ext_ack *extack) 763 { 764 struct net *net = sock_net(skb->sk); 765 struct fib_config cfg; 766 struct fib_table *tb; 767 int err; 768 769 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); 770 if (err < 0) 771 goto errout; 772 773 tb = fib_new_table(net, cfg.fc_table); 774 if (!tb) { 775 err = -ENOBUFS; 776 goto errout; 777 } 778 779 err = fib_table_insert(net, tb, &cfg, extack); 780 if (!err && cfg.fc_type == RTN_LOCAL) 781 net->ipv4.fib_has_custom_local_routes = true; 782 errout: 783 return err; 784 } 785 786 static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) 787 { 788 struct net *net = sock_net(skb->sk); 789 unsigned int h, s_h; 790 unsigned int e = 0, s_e; 791 struct fib_table *tb; 792 struct hlist_head *head; 793 int dumped = 0, err; 794 795 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && 796 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) 797 return skb->len; 798 799 s_h = cb->args[0]; 800 s_e = cb->args[1]; 801 802 rcu_read_lock(); 803 804 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { 805 e = 0; 806 head = &net->ipv4.fib_table_hash[h]; 807 hlist_for_each_entry_rcu(tb, head, tb_hlist) { 808 if (e < s_e) 809 goto next; 810 if (dumped) 811 memset(&cb->args[2], 0, sizeof(cb->args) - 812 2 * sizeof(cb->args[0])); 813 err = fib_table_dump(tb, skb, cb); 814 if (err < 0) { 815 if (likely(skb->len)) 816 goto out; 817 818 goto out_err; 819 } 820 dumped = 1; 821 next: 822 e++; 823 } 824 } 825 out: 826 err = skb->len; 827 out_err: 828 rcu_read_unlock(); 829 830 cb->args[1] = e; 831 cb->args[0] = h; 832 833 return err; 834 } 835 836 /* Prepare and feed intra-kernel routing request. 837 * Really, it should be netlink message, but :-( netlink 838 * can be not configured, so that we feed it directly 839 * to fib engine. It is legal, because all events occur 840 * only when netlink is already locked. 841 */ 842 static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) 843 { 844 struct net *net = dev_net(ifa->ifa_dev->dev); 845 u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); 846 struct fib_table *tb; 847 struct fib_config cfg = { 848 .fc_protocol = RTPROT_KERNEL, 849 .fc_type = type, 850 .fc_dst = dst, 851 .fc_dst_len = dst_len, 852 .fc_prefsrc = ifa->ifa_local, 853 .fc_oif = ifa->ifa_dev->dev->ifindex, 854 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, 855 .fc_nlinfo = { 856 .nl_net = net, 857 }, 858 }; 859 860 if (!tb_id) 861 tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; 862 863 tb = fib_new_table(net, tb_id); 864 if (!tb) 865 return; 866 867 cfg.fc_table = tb->tb_id; 868 869 if (type != RTN_LOCAL) 870 cfg.fc_scope = RT_SCOPE_LINK; 871 else 872 cfg.fc_scope = RT_SCOPE_HOST; 873 874 if (cmd == RTM_NEWROUTE) 875 fib_table_insert(net, tb, &cfg, NULL); 876 else 877 fib_table_delete(net, tb, &cfg, NULL); 878 } 879 880 void fib_add_ifaddr(struct in_ifaddr *ifa) 881 { 882 struct in_device *in_dev = ifa->ifa_dev; 883 struct net_device *dev = in_dev->dev; 884 struct in_ifaddr *prim = ifa; 885 __be32 mask = ifa->ifa_mask; 886 __be32 addr = ifa->ifa_local; 887 __be32 prefix = ifa->ifa_address & mask; 888 889 if (ifa->ifa_flags & IFA_F_SECONDARY) { 890 prim = inet_ifa_byprefix(in_dev, prefix, mask); 891 if (!prim) { 892 pr_warn("%s: bug: prim == NULL\n", __func__); 893 return; 894 } 895 } 896 897 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); 898 899 if (!(dev->flags & IFF_UP)) 900 return; 901 902 /* Add broadcast address, if it is explicitly assigned. */ 903 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) 904 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); 905 906 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && 907 (prefix != addr || ifa->ifa_prefixlen < 32)) { 908 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) 909 fib_magic(RTM_NEWROUTE, 910 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, 911 prefix, ifa->ifa_prefixlen, prim); 912 913 /* Add network specific broadcasts, when it takes a sense */ 914 if (ifa->ifa_prefixlen < 31) { 915 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); 916 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, 917 32, prim); 918 } 919 } 920 } 921 922 /* Delete primary or secondary address. 923 * Optionally, on secondary address promotion consider the addresses 924 * from subnet iprim as deleted, even if they are in device list. 925 * In this case the secondary ifa can be in device list. 926 */ 927 void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) 928 { 929 struct in_device *in_dev = ifa->ifa_dev; 930 struct net_device *dev = in_dev->dev; 931 struct in_ifaddr *ifa1; 932 struct in_ifaddr *prim = ifa, *prim1 = NULL; 933 __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; 934 __be32 any = ifa->ifa_address & ifa->ifa_mask; 935 #define LOCAL_OK 1 936 #define BRD_OK 2 937 #define BRD0_OK 4 938 #define BRD1_OK 8 939 unsigned int ok = 0; 940 int subnet = 0; /* Primary network */ 941 int gone = 1; /* Address is missing */ 942 int same_prefsrc = 0; /* Another primary with same IP */ 943 944 if (ifa->ifa_flags & IFA_F_SECONDARY) { 945 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); 946 if (!prim) { 947 /* if the device has been deleted, we don't perform 948 * address promotion 949 */ 950 if (!in_dev->dead) 951 pr_warn("%s: bug: prim == NULL\n", __func__); 952 return; 953 } 954 if (iprim && iprim != prim) { 955 pr_warn("%s: bug: iprim != prim\n", __func__); 956 return; 957 } 958 } else if (!ipv4_is_zeronet(any) && 959 (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { 960 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) 961 fib_magic(RTM_DELROUTE, 962 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, 963 any, ifa->ifa_prefixlen, prim); 964 subnet = 1; 965 } 966 967 if (in_dev->dead) 968 goto no_promotions; 969 970 /* Deletion is more complicated than add. 971 * We should take care of not to delete too much :-) 972 * 973 * Scan address list to be sure that addresses are really gone. 974 */ 975 976 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { 977 if (ifa1 == ifa) { 978 /* promotion, keep the IP */ 979 gone = 0; 980 continue; 981 } 982 /* Ignore IFAs from our subnet */ 983 if (iprim && ifa1->ifa_mask == iprim->ifa_mask && 984 inet_ifa_match(ifa1->ifa_address, iprim)) 985 continue; 986 987 /* Ignore ifa1 if it uses different primary IP (prefsrc) */ 988 if (ifa1->ifa_flags & IFA_F_SECONDARY) { 989 /* Another address from our subnet? */ 990 if (ifa1->ifa_mask == prim->ifa_mask && 991 inet_ifa_match(ifa1->ifa_address, prim)) 992 prim1 = prim; 993 else { 994 /* We reached the secondaries, so 995 * same_prefsrc should be determined. 996 */ 997 if (!same_prefsrc) 998 continue; 999 /* Search new prim1 if ifa1 is not 1000 * using the current prim1 1001 */ 1002 if (!prim1 || 1003 ifa1->ifa_mask != prim1->ifa_mask || 1004 !inet_ifa_match(ifa1->ifa_address, prim1)) 1005 prim1 = inet_ifa_byprefix(in_dev, 1006 ifa1->ifa_address, 1007 ifa1->ifa_mask); 1008 if (!prim1) 1009 continue; 1010 if (prim1->ifa_local != prim->ifa_local) 1011 continue; 1012 } 1013 } else { 1014 if (prim->ifa_local != ifa1->ifa_local) 1015 continue; 1016 prim1 = ifa1; 1017 if (prim != prim1) 1018 same_prefsrc = 1; 1019 } 1020 if (ifa->ifa_local == ifa1->ifa_local) 1021 ok |= LOCAL_OK; 1022 if (ifa->ifa_broadcast == ifa1->ifa_broadcast) 1023 ok |= BRD_OK; 1024 if (brd == ifa1->ifa_broadcast) 1025 ok |= BRD1_OK; 1026 if (any == ifa1->ifa_broadcast) 1027 ok |= BRD0_OK; 1028 /* primary has network specific broadcasts */ 1029 if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { 1030 __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; 1031 __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; 1032 1033 if (!ipv4_is_zeronet(any1)) { 1034 if (ifa->ifa_broadcast == brd1 || 1035 ifa->ifa_broadcast == any1) 1036 ok |= BRD_OK; 1037 if (brd == brd1 || brd == any1) 1038 ok |= BRD1_OK; 1039 if (any == brd1 || any == any1) 1040 ok |= BRD0_OK; 1041 } 1042 } 1043 } 1044 1045 no_promotions: 1046 if (!(ok & BRD_OK)) 1047 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); 1048 if (subnet && ifa->ifa_prefixlen < 31) { 1049 if (!(ok & BRD1_OK)) 1050 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); 1051 if (!(ok & BRD0_OK)) 1052 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); 1053 } 1054 if (!(ok & LOCAL_OK)) { 1055 unsigned int addr_type; 1056 1057 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); 1058 1059 /* Check, that this local address finally disappeared. */ 1060 addr_type = inet_addr_type_dev_table(dev_net(dev), dev, 1061 ifa->ifa_local); 1062 if (gone && addr_type != RTN_LOCAL) { 1063 /* And the last, but not the least thing. 1064 * We must flush stray FIB entries. 1065 * 1066 * First of all, we scan fib_info list searching 1067 * for stray nexthop entries, then ignite fib_flush. 1068 */ 1069 if (fib_sync_down_addr(dev, ifa->ifa_local)) 1070 fib_flush(dev_net(dev)); 1071 } 1072 } 1073 #undef LOCAL_OK 1074 #undef BRD_OK 1075 #undef BRD0_OK 1076 #undef BRD1_OK 1077 } 1078 1079 static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) 1080 { 1081 1082 struct fib_result res; 1083 struct flowi4 fl4 = { 1084 .flowi4_mark = frn->fl_mark, 1085 .daddr = frn->fl_addr, 1086 .flowi4_tos = frn->fl_tos, 1087 .flowi4_scope = frn->fl_scope, 1088 }; 1089 struct fib_table *tb; 1090 1091 rcu_read_lock(); 1092 1093 tb = fib_get_table(net, frn->tb_id_in); 1094 1095 frn->err = -ENOENT; 1096 if (tb) { 1097 local_bh_disable(); 1098 1099 frn->tb_id = tb->tb_id; 1100 frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); 1101 1102 if (!frn->err) { 1103 frn->prefixlen = res.prefixlen; 1104 frn->nh_sel = res.nh_sel; 1105 frn->type = res.type; 1106 frn->scope = res.scope; 1107 } 1108 local_bh_enable(); 1109 } 1110 1111 rcu_read_unlock(); 1112 } 1113 1114 static void nl_fib_input(struct sk_buff *skb) 1115 { 1116 struct net *net; 1117 struct fib_result_nl *frn; 1118 struct nlmsghdr *nlh; 1119 u32 portid; 1120 1121 net = sock_net(skb->sk); 1122 nlh = nlmsg_hdr(skb); 1123 if (skb->len < nlmsg_total_size(sizeof(*frn)) || 1124 skb->len < nlh->nlmsg_len || 1125 nlmsg_len(nlh) < sizeof(*frn)) 1126 return; 1127 1128 skb = netlink_skb_clone(skb, GFP_KERNEL); 1129 if (!skb) 1130 return; 1131 nlh = nlmsg_hdr(skb); 1132 1133 frn = (struct fib_result_nl *) nlmsg_data(nlh); 1134 nl_fib_lookup(net, frn); 1135 1136 portid = NETLINK_CB(skb).portid; /* netlink portid */ 1137 NETLINK_CB(skb).portid = 0; /* from kernel */ 1138 NETLINK_CB(skb).dst_group = 0; /* unicast */ 1139 netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); 1140 } 1141 1142 static int __net_init nl_fib_lookup_init(struct net *net) 1143 { 1144 struct sock *sk; 1145 struct netlink_kernel_cfg cfg = { 1146 .input = nl_fib_input, 1147 }; 1148 1149 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); 1150 if (!sk) 1151 return -EAFNOSUPPORT; 1152 net->ipv4.fibnl = sk; 1153 return 0; 1154 } 1155 1156 static void nl_fib_lookup_exit(struct net *net) 1157 { 1158 netlink_kernel_release(net->ipv4.fibnl); 1159 net->ipv4.fibnl = NULL; 1160 } 1161 1162 static void fib_disable_ip(struct net_device *dev, unsigned long event, 1163 bool force) 1164 { 1165 if (fib_sync_down_dev(dev, event, force)) 1166 fib_flush(dev_net(dev)); 1167 else 1168 rt_cache_flush(dev_net(dev)); 1169 arp_ifdown(dev); 1170 } 1171 1172 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) 1173 { 1174 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 1175 struct net_device *dev = ifa->ifa_dev->dev; 1176 struct net *net = dev_net(dev); 1177 1178 switch (event) { 1179 case NETDEV_UP: 1180 fib_add_ifaddr(ifa); 1181 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1182 fib_sync_up(dev, RTNH_F_DEAD); 1183 #endif 1184 atomic_inc(&net->ipv4.dev_addr_genid); 1185 rt_cache_flush(dev_net(dev)); 1186 break; 1187 case NETDEV_DOWN: 1188 fib_del_ifaddr(ifa, NULL); 1189 atomic_inc(&net->ipv4.dev_addr_genid); 1190 if (!ifa->ifa_dev->ifa_list) { 1191 /* Last address was deleted from this interface. 1192 * Disable IP. 1193 */ 1194 fib_disable_ip(dev, event, true); 1195 } else { 1196 rt_cache_flush(dev_net(dev)); 1197 } 1198 break; 1199 } 1200 return NOTIFY_DONE; 1201 } 1202 1203 static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) 1204 { 1205 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1206 struct netdev_notifier_changeupper_info *info; 1207 struct in_device *in_dev; 1208 struct net *net = dev_net(dev); 1209 unsigned int flags; 1210 1211 if (event == NETDEV_UNREGISTER) { 1212 fib_disable_ip(dev, event, true); 1213 rt_flush_dev(dev); 1214 return NOTIFY_DONE; 1215 } 1216 1217 in_dev = __in_dev_get_rtnl(dev); 1218 if (!in_dev) 1219 return NOTIFY_DONE; 1220 1221 switch (event) { 1222 case NETDEV_UP: 1223 for_ifa(in_dev) { 1224 fib_add_ifaddr(ifa); 1225 } endfor_ifa(in_dev); 1226 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1227 fib_sync_up(dev, RTNH_F_DEAD); 1228 #endif 1229 atomic_inc(&net->ipv4.dev_addr_genid); 1230 rt_cache_flush(net); 1231 break; 1232 case NETDEV_DOWN: 1233 fib_disable_ip(dev, event, false); 1234 break; 1235 case NETDEV_CHANGE: 1236 flags = dev_get_flags(dev); 1237 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1238 fib_sync_up(dev, RTNH_F_LINKDOWN); 1239 else 1240 fib_sync_down_dev(dev, event, false); 1241 /* fall through */ 1242 case NETDEV_CHANGEMTU: 1243 rt_cache_flush(net); 1244 break; 1245 case NETDEV_CHANGEUPPER: 1246 info = ptr; 1247 /* flush all routes if dev is linked to or unlinked from 1248 * an L3 master device (e.g., VRF) 1249 */ 1250 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 1251 fib_disable_ip(dev, NETDEV_DOWN, true); 1252 break; 1253 } 1254 return NOTIFY_DONE; 1255 } 1256 1257 static struct notifier_block fib_inetaddr_notifier = { 1258 .notifier_call = fib_inetaddr_event, 1259 }; 1260 1261 static struct notifier_block fib_netdev_notifier = { 1262 .notifier_call = fib_netdev_event, 1263 }; 1264 1265 static int __net_init ip_fib_net_init(struct net *net) 1266 { 1267 int err; 1268 size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; 1269 1270 err = fib4_notifier_init(net); 1271 if (err) 1272 return err; 1273 1274 /* Avoid false sharing : Use at least a full cache line */ 1275 size = max_t(size_t, size, L1_CACHE_BYTES); 1276 1277 net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); 1278 if (!net->ipv4.fib_table_hash) { 1279 err = -ENOMEM; 1280 goto err_table_hash_alloc; 1281 } 1282 1283 err = fib4_rules_init(net); 1284 if (err < 0) 1285 goto err_rules_init; 1286 return 0; 1287 1288 err_rules_init: 1289 kfree(net->ipv4.fib_table_hash); 1290 err_table_hash_alloc: 1291 fib4_notifier_exit(net); 1292 return err; 1293 } 1294 1295 static void ip_fib_net_exit(struct net *net) 1296 { 1297 int i; 1298 1299 rtnl_lock(); 1300 #ifdef CONFIG_IP_MULTIPLE_TABLES 1301 RCU_INIT_POINTER(net->ipv4.fib_main, NULL); 1302 RCU_INIT_POINTER(net->ipv4.fib_default, NULL); 1303 #endif 1304 /* Destroy the tables in reverse order to guarantee that the 1305 * local table, ID 255, is destroyed before the main table, ID 1306 * 254. This is necessary as the local table may contain 1307 * references to data contained in the main table. 1308 */ 1309 for (i = FIB_TABLE_HASHSZ - 1; i >= 0; i--) { 1310 struct hlist_head *head = &net->ipv4.fib_table_hash[i]; 1311 struct hlist_node *tmp; 1312 struct fib_table *tb; 1313 1314 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { 1315 hlist_del(&tb->tb_hlist); 1316 fib_table_flush(net, tb); 1317 fib_free_table(tb); 1318 } 1319 } 1320 1321 #ifdef CONFIG_IP_MULTIPLE_TABLES 1322 fib4_rules_exit(net); 1323 #endif 1324 rtnl_unlock(); 1325 kfree(net->ipv4.fib_table_hash); 1326 fib4_notifier_exit(net); 1327 } 1328 1329 static int __net_init fib_net_init(struct net *net) 1330 { 1331 int error; 1332 1333 #ifdef CONFIG_IP_ROUTE_CLASSID 1334 net->ipv4.fib_num_tclassid_users = 0; 1335 #endif 1336 error = ip_fib_net_init(net); 1337 if (error < 0) 1338 goto out; 1339 error = nl_fib_lookup_init(net); 1340 if (error < 0) 1341 goto out_nlfl; 1342 error = fib_proc_init(net); 1343 if (error < 0) 1344 goto out_proc; 1345 out: 1346 return error; 1347 1348 out_proc: 1349 nl_fib_lookup_exit(net); 1350 out_nlfl: 1351 ip_fib_net_exit(net); 1352 goto out; 1353 } 1354 1355 static void __net_exit fib_net_exit(struct net *net) 1356 { 1357 fib_proc_exit(net); 1358 nl_fib_lookup_exit(net); 1359 ip_fib_net_exit(net); 1360 } 1361 1362 static struct pernet_operations fib_net_ops = { 1363 .init = fib_net_init, 1364 .exit = fib_net_exit, 1365 }; 1366 1367 void __init ip_fib_init(void) 1368 { 1369 fib_trie_init(); 1370 1371 register_pernet_subsys(&fib_net_ops); 1372 1373 register_netdevice_notifier(&fib_netdev_notifier); 1374 register_inetaddr_notifier(&fib_inetaddr_notifier); 1375 1376 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0); 1377 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0); 1378 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0); 1379 } 1380