net/ipv4/fib_frontend.c

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