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