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, void __user *arg) 591 { 592 struct fib_config cfg; 593 struct rtentry rt; 594 int err; 595 596 switch (cmd) { 597 case SIOCADDRT: /* Add a route */ 598 case SIOCDELRT: /* Delete a route */ 599 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 600 return -EPERM; 601 602 if (copy_from_user(&rt, arg, sizeof(rt))) 603 return -EFAULT; 604 605 rtnl_lock(); 606 err = rtentry_to_fib_config(net, cmd, &rt, &cfg); 607 if (err == 0) { 608 struct fib_table *tb; 609 610 if (cmd == SIOCDELRT) { 611 tb = fib_get_table(net, cfg.fc_table); 612 if (tb) 613 err = fib_table_delete(net, tb, &cfg, 614 NULL); 615 else 616 err = -ESRCH; 617 } else { 618 tb = fib_new_table(net, cfg.fc_table); 619 if (tb) 620 err = fib_table_insert(net, tb, 621 &cfg, NULL); 622 else 623 err = -ENOBUFS; 624 } 625 626 /* allocated by rtentry_to_fib_config() */ 627 kfree(cfg.fc_mx); 628 } 629 rtnl_unlock(); 630 return err; 631 } 632 return -EINVAL; 633 } 634 635 const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { 636 [RTA_DST] = { .type = NLA_U32 }, 637 [RTA_SRC] = { .type = NLA_U32 }, 638 [RTA_IIF] = { .type = NLA_U32 }, 639 [RTA_OIF] = { .type = NLA_U32 }, 640 [RTA_GATEWAY] = { .type = NLA_U32 }, 641 [RTA_PRIORITY] = { .type = NLA_U32 }, 642 [RTA_PREFSRC] = { .type = NLA_U32 }, 643 [RTA_METRICS] = { .type = NLA_NESTED }, 644 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, 645 [RTA_FLOW] = { .type = NLA_U32 }, 646 [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, 647 [RTA_ENCAP] = { .type = NLA_NESTED }, 648 [RTA_UID] = { .type = NLA_U32 }, 649 [RTA_MARK] = { .type = NLA_U32 }, 650 }; 651 652 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, 653 struct nlmsghdr *nlh, struct fib_config *cfg, 654 struct netlink_ext_ack *extack) 655 { 656 struct nlattr *attr; 657 int err, remaining; 658 struct rtmsg *rtm; 659 660 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy, 661 extack); 662 if (err < 0) 663 goto errout; 664 665 memset(cfg, 0, sizeof(*cfg)); 666 667 rtm = nlmsg_data(nlh); 668 cfg->fc_dst_len = rtm->rtm_dst_len; 669 cfg->fc_tos = rtm->rtm_tos; 670 cfg->fc_table = rtm->rtm_table; 671 cfg->fc_protocol = rtm->rtm_protocol; 672 cfg->fc_scope = rtm->rtm_scope; 673 cfg->fc_type = rtm->rtm_type; 674 cfg->fc_flags = rtm->rtm_flags; 675 cfg->fc_nlflags = nlh->nlmsg_flags; 676 677 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; 678 cfg->fc_nlinfo.nlh = nlh; 679 cfg->fc_nlinfo.nl_net = net; 680 681 if (cfg->fc_type > RTN_MAX) { 682 NL_SET_ERR_MSG(extack, "Invalid route type"); 683 err = -EINVAL; 684 goto errout; 685 } 686 687 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { 688 switch (nla_type(attr)) { 689 case RTA_DST: 690 cfg->fc_dst = nla_get_be32(attr); 691 break; 692 case RTA_OIF: 693 cfg->fc_oif = nla_get_u32(attr); 694 break; 695 case RTA_GATEWAY: 696 cfg->fc_gw = nla_get_be32(attr); 697 break; 698 case RTA_PRIORITY: 699 cfg->fc_priority = nla_get_u32(attr); 700 break; 701 case RTA_PREFSRC: 702 cfg->fc_prefsrc = nla_get_be32(attr); 703 break; 704 case RTA_METRICS: 705 cfg->fc_mx = nla_data(attr); 706 cfg->fc_mx_len = nla_len(attr); 707 break; 708 case RTA_MULTIPATH: 709 err = lwtunnel_valid_encap_type_attr(nla_data(attr), 710 nla_len(attr), 711 extack); 712 if (err < 0) 713 goto errout; 714 cfg->fc_mp = nla_data(attr); 715 cfg->fc_mp_len = nla_len(attr); 716 break; 717 case RTA_FLOW: 718 cfg->fc_flow = nla_get_u32(attr); 719 break; 720 case RTA_TABLE: 721 cfg->fc_table = nla_get_u32(attr); 722 break; 723 case RTA_ENCAP: 724 cfg->fc_encap = attr; 725 break; 726 case RTA_ENCAP_TYPE: 727 cfg->fc_encap_type = nla_get_u16(attr); 728 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, 729 extack); 730 if (err < 0) 731 goto errout; 732 break; 733 } 734 } 735 736 return 0; 737 errout: 738 return err; 739 } 740 741 static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 742 struct netlink_ext_ack *extack) 743 { 744 struct net *net = sock_net(skb->sk); 745 struct fib_config cfg; 746 struct fib_table *tb; 747 int err; 748 749 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); 750 if (err < 0) 751 goto errout; 752 753 tb = fib_get_table(net, cfg.fc_table); 754 if (!tb) { 755 NL_SET_ERR_MSG(extack, "FIB table does not exist"); 756 err = -ESRCH; 757 goto errout; 758 } 759 760 err = fib_table_delete(net, tb, &cfg, extack); 761 errout: 762 return err; 763 } 764 765 static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, 766 struct netlink_ext_ack *extack) 767 { 768 struct net *net = sock_net(skb->sk); 769 struct fib_config cfg; 770 struct fib_table *tb; 771 int err; 772 773 err = rtm_to_fib_config(net, skb, nlh, &cfg, extack); 774 if (err < 0) 775 goto errout; 776 777 tb = fib_new_table(net, cfg.fc_table); 778 if (!tb) { 779 err = -ENOBUFS; 780 goto errout; 781 } 782 783 err = fib_table_insert(net, tb, &cfg, extack); 784 if (!err && cfg.fc_type == RTN_LOCAL) 785 net->ipv4.fib_has_custom_local_routes = true; 786 errout: 787 return err; 788 } 789 790 static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) 791 { 792 struct net *net = sock_net(skb->sk); 793 unsigned int h, s_h; 794 unsigned int e = 0, s_e; 795 struct fib_table *tb; 796 struct hlist_head *head; 797 int dumped = 0, err; 798 799 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && 800 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) 801 return skb->len; 802 803 s_h = cb->args[0]; 804 s_e = cb->args[1]; 805 806 rcu_read_lock(); 807 808 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { 809 e = 0; 810 head = &net->ipv4.fib_table_hash[h]; 811 hlist_for_each_entry_rcu(tb, head, tb_hlist) { 812 if (e < s_e) 813 goto next; 814 if (dumped) 815 memset(&cb->args[2], 0, sizeof(cb->args) - 816 2 * sizeof(cb->args[0])); 817 err = fib_table_dump(tb, skb, cb); 818 if (err < 0) { 819 if (likely(skb->len)) 820 goto out; 821 822 goto out_err; 823 } 824 dumped = 1; 825 next: 826 e++; 827 } 828 } 829 out: 830 err = skb->len; 831 out_err: 832 rcu_read_unlock(); 833 834 cb->args[1] = e; 835 cb->args[0] = h; 836 837 return err; 838 } 839 840 /* Prepare and feed intra-kernel routing request. 841 * Really, it should be netlink message, but :-( netlink 842 * can be not configured, so that we feed it directly 843 * to fib engine. It is legal, because all events occur 844 * only when netlink is already locked. 845 */ 846 static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) 847 { 848 struct net *net = dev_net(ifa->ifa_dev->dev); 849 u32 tb_id = l3mdev_fib_table(ifa->ifa_dev->dev); 850 struct fib_table *tb; 851 struct fib_config cfg = { 852 .fc_protocol = RTPROT_KERNEL, 853 .fc_type = type, 854 .fc_dst = dst, 855 .fc_dst_len = dst_len, 856 .fc_prefsrc = ifa->ifa_local, 857 .fc_oif = ifa->ifa_dev->dev->ifindex, 858 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, 859 .fc_nlinfo = { 860 .nl_net = net, 861 }, 862 }; 863 864 if (!tb_id) 865 tb_id = (type == RTN_UNICAST) ? RT_TABLE_MAIN : RT_TABLE_LOCAL; 866 867 tb = fib_new_table(net, tb_id); 868 if (!tb) 869 return; 870 871 cfg.fc_table = tb->tb_id; 872 873 if (type != RTN_LOCAL) 874 cfg.fc_scope = RT_SCOPE_LINK; 875 else 876 cfg.fc_scope = RT_SCOPE_HOST; 877 878 if (cmd == RTM_NEWROUTE) 879 fib_table_insert(net, tb, &cfg, NULL); 880 else 881 fib_table_delete(net, tb, &cfg, NULL); 882 } 883 884 void fib_add_ifaddr(struct in_ifaddr *ifa) 885 { 886 struct in_device *in_dev = ifa->ifa_dev; 887 struct net_device *dev = in_dev->dev; 888 struct in_ifaddr *prim = ifa; 889 __be32 mask = ifa->ifa_mask; 890 __be32 addr = ifa->ifa_local; 891 __be32 prefix = ifa->ifa_address & mask; 892 893 if (ifa->ifa_flags & IFA_F_SECONDARY) { 894 prim = inet_ifa_byprefix(in_dev, prefix, mask); 895 if (!prim) { 896 pr_warn("%s: bug: prim == NULL\n", __func__); 897 return; 898 } 899 } 900 901 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); 902 903 if (!(dev->flags & IFF_UP)) 904 return; 905 906 /* Add broadcast address, if it is explicitly assigned. */ 907 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) 908 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); 909 910 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) && 911 (prefix != addr || ifa->ifa_prefixlen < 32)) { 912 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) 913 fib_magic(RTM_NEWROUTE, 914 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, 915 prefix, ifa->ifa_prefixlen, prim); 916 917 /* Add network specific broadcasts, when it takes a sense */ 918 if (ifa->ifa_prefixlen < 31) { 919 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); 920 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask, 921 32, prim); 922 } 923 } 924 } 925 926 /* Delete primary or secondary address. 927 * Optionally, on secondary address promotion consider the addresses 928 * from subnet iprim as deleted, even if they are in device list. 929 * In this case the secondary ifa can be in device list. 930 */ 931 void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim) 932 { 933 struct in_device *in_dev = ifa->ifa_dev; 934 struct net_device *dev = in_dev->dev; 935 struct in_ifaddr *ifa1; 936 struct in_ifaddr *prim = ifa, *prim1 = NULL; 937 __be32 brd = ifa->ifa_address | ~ifa->ifa_mask; 938 __be32 any = ifa->ifa_address & ifa->ifa_mask; 939 #define LOCAL_OK 1 940 #define BRD_OK 2 941 #define BRD0_OK 4 942 #define BRD1_OK 8 943 unsigned int ok = 0; 944 int subnet = 0; /* Primary network */ 945 int gone = 1; /* Address is missing */ 946 int same_prefsrc = 0; /* Another primary with same IP */ 947 948 if (ifa->ifa_flags & IFA_F_SECONDARY) { 949 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); 950 if (!prim) { 951 /* if the device has been deleted, we don't perform 952 * address promotion 953 */ 954 if (!in_dev->dead) 955 pr_warn("%s: bug: prim == NULL\n", __func__); 956 return; 957 } 958 if (iprim && iprim != prim) { 959 pr_warn("%s: bug: iprim != prim\n", __func__); 960 return; 961 } 962 } else if (!ipv4_is_zeronet(any) && 963 (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) { 964 if (!(ifa->ifa_flags & IFA_F_NOPREFIXROUTE)) 965 fib_magic(RTM_DELROUTE, 966 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST, 967 any, ifa->ifa_prefixlen, prim); 968 subnet = 1; 969 } 970 971 if (in_dev->dead) 972 goto no_promotions; 973 974 /* Deletion is more complicated than add. 975 * We should take care of not to delete too much :-) 976 * 977 * Scan address list to be sure that addresses are really gone. 978 */ 979 980 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { 981 if (ifa1 == ifa) { 982 /* promotion, keep the IP */ 983 gone = 0; 984 continue; 985 } 986 /* Ignore IFAs from our subnet */ 987 if (iprim && ifa1->ifa_mask == iprim->ifa_mask && 988 inet_ifa_match(ifa1->ifa_address, iprim)) 989 continue; 990 991 /* Ignore ifa1 if it uses different primary IP (prefsrc) */ 992 if (ifa1->ifa_flags & IFA_F_SECONDARY) { 993 /* Another address from our subnet? */ 994 if (ifa1->ifa_mask == prim->ifa_mask && 995 inet_ifa_match(ifa1->ifa_address, prim)) 996 prim1 = prim; 997 else { 998 /* We reached the secondaries, so 999 * same_prefsrc should be determined. 1000 */ 1001 if (!same_prefsrc) 1002 continue; 1003 /* Search new prim1 if ifa1 is not 1004 * using the current prim1 1005 */ 1006 if (!prim1 || 1007 ifa1->ifa_mask != prim1->ifa_mask || 1008 !inet_ifa_match(ifa1->ifa_address, prim1)) 1009 prim1 = inet_ifa_byprefix(in_dev, 1010 ifa1->ifa_address, 1011 ifa1->ifa_mask); 1012 if (!prim1) 1013 continue; 1014 if (prim1->ifa_local != prim->ifa_local) 1015 continue; 1016 } 1017 } else { 1018 if (prim->ifa_local != ifa1->ifa_local) 1019 continue; 1020 prim1 = ifa1; 1021 if (prim != prim1) 1022 same_prefsrc = 1; 1023 } 1024 if (ifa->ifa_local == ifa1->ifa_local) 1025 ok |= LOCAL_OK; 1026 if (ifa->ifa_broadcast == ifa1->ifa_broadcast) 1027 ok |= BRD_OK; 1028 if (brd == ifa1->ifa_broadcast) 1029 ok |= BRD1_OK; 1030 if (any == ifa1->ifa_broadcast) 1031 ok |= BRD0_OK; 1032 /* primary has network specific broadcasts */ 1033 if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) { 1034 __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask; 1035 __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask; 1036 1037 if (!ipv4_is_zeronet(any1)) { 1038 if (ifa->ifa_broadcast == brd1 || 1039 ifa->ifa_broadcast == any1) 1040 ok |= BRD_OK; 1041 if (brd == brd1 || brd == any1) 1042 ok |= BRD1_OK; 1043 if (any == brd1 || any == any1) 1044 ok |= BRD0_OK; 1045 } 1046 } 1047 } 1048 1049 no_promotions: 1050 if (!(ok & BRD_OK)) 1051 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); 1052 if (subnet && ifa->ifa_prefixlen < 31) { 1053 if (!(ok & BRD1_OK)) 1054 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); 1055 if (!(ok & BRD0_OK)) 1056 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); 1057 } 1058 if (!(ok & LOCAL_OK)) { 1059 unsigned int addr_type; 1060 1061 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); 1062 1063 /* Check, that this local address finally disappeared. */ 1064 addr_type = inet_addr_type_dev_table(dev_net(dev), dev, 1065 ifa->ifa_local); 1066 if (gone && addr_type != RTN_LOCAL) { 1067 /* And the last, but not the least thing. 1068 * We must flush stray FIB entries. 1069 * 1070 * First of all, we scan fib_info list searching 1071 * for stray nexthop entries, then ignite fib_flush. 1072 */ 1073 if (fib_sync_down_addr(dev, ifa->ifa_local)) 1074 fib_flush(dev_net(dev)); 1075 } 1076 } 1077 #undef LOCAL_OK 1078 #undef BRD_OK 1079 #undef BRD0_OK 1080 #undef BRD1_OK 1081 } 1082 1083 static void nl_fib_lookup(struct net *net, struct fib_result_nl *frn) 1084 { 1085 1086 struct fib_result res; 1087 struct flowi4 fl4 = { 1088 .flowi4_mark = frn->fl_mark, 1089 .daddr = frn->fl_addr, 1090 .flowi4_tos = frn->fl_tos, 1091 .flowi4_scope = frn->fl_scope, 1092 }; 1093 struct fib_table *tb; 1094 1095 rcu_read_lock(); 1096 1097 tb = fib_get_table(net, frn->tb_id_in); 1098 1099 frn->err = -ENOENT; 1100 if (tb) { 1101 local_bh_disable(); 1102 1103 frn->tb_id = tb->tb_id; 1104 frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); 1105 1106 if (!frn->err) { 1107 frn->prefixlen = res.prefixlen; 1108 frn->nh_sel = res.nh_sel; 1109 frn->type = res.type; 1110 frn->scope = res.scope; 1111 } 1112 local_bh_enable(); 1113 } 1114 1115 rcu_read_unlock(); 1116 } 1117 1118 static void nl_fib_input(struct sk_buff *skb) 1119 { 1120 struct net *net; 1121 struct fib_result_nl *frn; 1122 struct nlmsghdr *nlh; 1123 u32 portid; 1124 1125 net = sock_net(skb->sk); 1126 nlh = nlmsg_hdr(skb); 1127 if (skb->len < nlmsg_total_size(sizeof(*frn)) || 1128 skb->len < nlh->nlmsg_len || 1129 nlmsg_len(nlh) < sizeof(*frn)) 1130 return; 1131 1132 skb = netlink_skb_clone(skb, GFP_KERNEL); 1133 if (!skb) 1134 return; 1135 nlh = nlmsg_hdr(skb); 1136 1137 frn = (struct fib_result_nl *) nlmsg_data(nlh); 1138 nl_fib_lookup(net, frn); 1139 1140 portid = NETLINK_CB(skb).portid; /* netlink portid */ 1141 NETLINK_CB(skb).portid = 0; /* from kernel */ 1142 NETLINK_CB(skb).dst_group = 0; /* unicast */ 1143 netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT); 1144 } 1145 1146 static int __net_init nl_fib_lookup_init(struct net *net) 1147 { 1148 struct sock *sk; 1149 struct netlink_kernel_cfg cfg = { 1150 .input = nl_fib_input, 1151 }; 1152 1153 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg); 1154 if (!sk) 1155 return -EAFNOSUPPORT; 1156 net->ipv4.fibnl = sk; 1157 return 0; 1158 } 1159 1160 static void nl_fib_lookup_exit(struct net *net) 1161 { 1162 netlink_kernel_release(net->ipv4.fibnl); 1163 net->ipv4.fibnl = NULL; 1164 } 1165 1166 static void fib_disable_ip(struct net_device *dev, unsigned long event, 1167 bool force) 1168 { 1169 if (fib_sync_down_dev(dev, event, force)) 1170 fib_flush(dev_net(dev)); 1171 else 1172 rt_cache_flush(dev_net(dev)); 1173 arp_ifdown(dev); 1174 } 1175 1176 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) 1177 { 1178 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr; 1179 struct net_device *dev = ifa->ifa_dev->dev; 1180 struct net *net = dev_net(dev); 1181 1182 switch (event) { 1183 case NETDEV_UP: 1184 fib_add_ifaddr(ifa); 1185 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1186 fib_sync_up(dev, RTNH_F_DEAD); 1187 #endif 1188 atomic_inc(&net->ipv4.dev_addr_genid); 1189 rt_cache_flush(dev_net(dev)); 1190 break; 1191 case NETDEV_DOWN: 1192 fib_del_ifaddr(ifa, NULL); 1193 atomic_inc(&net->ipv4.dev_addr_genid); 1194 if (!ifa->ifa_dev->ifa_list) { 1195 /* Last address was deleted from this interface. 1196 * Disable IP. 1197 */ 1198 fib_disable_ip(dev, event, true); 1199 } else { 1200 rt_cache_flush(dev_net(dev)); 1201 } 1202 break; 1203 } 1204 return NOTIFY_DONE; 1205 } 1206 1207 static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) 1208 { 1209 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1210 struct netdev_notifier_changeupper_info *info; 1211 struct in_device *in_dev; 1212 struct net *net = dev_net(dev); 1213 unsigned int flags; 1214 1215 if (event == NETDEV_UNREGISTER) { 1216 fib_disable_ip(dev, event, true); 1217 rt_flush_dev(dev); 1218 return NOTIFY_DONE; 1219 } 1220 1221 in_dev = __in_dev_get_rtnl(dev); 1222 if (!in_dev) 1223 return NOTIFY_DONE; 1224 1225 switch (event) { 1226 case NETDEV_UP: 1227 for_ifa(in_dev) { 1228 fib_add_ifaddr(ifa); 1229 } endfor_ifa(in_dev); 1230 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1231 fib_sync_up(dev, RTNH_F_DEAD); 1232 #endif 1233 atomic_inc(&net->ipv4.dev_addr_genid); 1234 rt_cache_flush(net); 1235 break; 1236 case NETDEV_DOWN: 1237 fib_disable_ip(dev, event, false); 1238 break; 1239 case NETDEV_CHANGE: 1240 flags = dev_get_flags(dev); 1241 if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1242 fib_sync_up(dev, RTNH_F_LINKDOWN); 1243 else 1244 fib_sync_down_dev(dev, event, false); 1245 /* fall through */ 1246 case NETDEV_CHANGEMTU: 1247 rt_cache_flush(net); 1248 break; 1249 case NETDEV_CHANGEUPPER: 1250 info = ptr; 1251 /* flush all routes if dev is linked to or unlinked from 1252 * an L3 master device (e.g., VRF) 1253 */ 1254 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 1255 fib_disable_ip(dev, NETDEV_DOWN, true); 1256 break; 1257 } 1258 return NOTIFY_DONE; 1259 } 1260 1261 static struct notifier_block fib_inetaddr_notifier = { 1262 .notifier_call = fib_inetaddr_event, 1263 }; 1264 1265 static struct notifier_block fib_netdev_notifier = { 1266 .notifier_call = fib_netdev_event, 1267 }; 1268 1269 static int __net_init ip_fib_net_init(struct net *net) 1270 { 1271 int err; 1272 size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ; 1273 1274 err = fib4_notifier_init(net); 1275 if (err) 1276 return err; 1277 1278 /* Avoid false sharing : Use at least a full cache line */ 1279 size = max_t(size_t, size, L1_CACHE_BYTES); 1280 1281 net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL); 1282 if (!net->ipv4.fib_table_hash) { 1283 err = -ENOMEM; 1284 goto err_table_hash_alloc; 1285 } 1286 1287 err = fib4_rules_init(net); 1288 if (err < 0) 1289 goto err_rules_init; 1290 return 0; 1291 1292 err_rules_init: 1293 kfree(net->ipv4.fib_table_hash); 1294 err_table_hash_alloc: 1295 fib4_notifier_exit(net); 1296 return err; 1297 } 1298 1299 static void ip_fib_net_exit(struct net *net) 1300 { 1301 unsigned int i; 1302 1303 rtnl_lock(); 1304 #ifdef CONFIG_IP_MULTIPLE_TABLES 1305 RCU_INIT_POINTER(net->ipv4.fib_main, NULL); 1306 RCU_INIT_POINTER(net->ipv4.fib_default, NULL); 1307 #endif 1308 for (i = 0; i < FIB_TABLE_HASHSZ; i++) { 1309 struct hlist_head *head = &net->ipv4.fib_table_hash[i]; 1310 struct hlist_node *tmp; 1311 struct fib_table *tb; 1312 1313 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) { 1314 hlist_del(&tb->tb_hlist); 1315 fib_table_flush(net, tb); 1316 fib_free_table(tb); 1317 } 1318 } 1319 1320 #ifdef CONFIG_IP_MULTIPLE_TABLES 1321 fib4_rules_exit(net); 1322 #endif 1323 rtnl_unlock(); 1324 kfree(net->ipv4.fib_table_hash); 1325 fib4_notifier_exit(net); 1326 } 1327 1328 static int __net_init fib_net_init(struct net *net) 1329 { 1330 int error; 1331 1332 #ifdef CONFIG_IP_ROUTE_CLASSID 1333 net->ipv4.fib_num_tclassid_users = 0; 1334 #endif 1335 error = ip_fib_net_init(net); 1336 if (error < 0) 1337 goto out; 1338 error = nl_fib_lookup_init(net); 1339 if (error < 0) 1340 goto out_nlfl; 1341 error = fib_proc_init(net); 1342 if (error < 0) 1343 goto out_proc; 1344 out: 1345 return error; 1346 1347 out_proc: 1348 nl_fib_lookup_exit(net); 1349 out_nlfl: 1350 ip_fib_net_exit(net); 1351 goto out; 1352 } 1353 1354 static void __net_exit fib_net_exit(struct net *net) 1355 { 1356 fib_proc_exit(net); 1357 nl_fib_lookup_exit(net); 1358 ip_fib_net_exit(net); 1359 } 1360 1361 static struct pernet_operations fib_net_ops = { 1362 .init = fib_net_init, 1363 .exit = fib_net_exit, 1364 }; 1365 1366 void __init ip_fib_init(void) 1367 { 1368 fib_trie_init(); 1369 1370 register_pernet_subsys(&fib_net_ops); 1371 1372 register_netdevice_notifier(&fib_netdev_notifier); 1373 register_inetaddr_notifier(&fib_inetaddr_notifier); 1374 1375 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, 0); 1376 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, 0); 1377 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, 0); 1378 } 1379