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.
6 * IPv4 Forwarding Information Base: FIB frontend.
8 * Version: $Id: fib_frontend.c,v 1.26 2001/10/31 21:55:54 davem Exp $
10 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
18 #include <linux/module.h>
19 #include <asm/uaccess.h>
20 #include <asm/system.h>
21 #include <linux/bitops.h>
22 #include <linux/capability.h>
23 #include <linux/types.h>
24 #include <linux/kernel.h>
26 #include <linux/string.h>
27 #include <linux/socket.h>
28 #include <linux/sockios.h>
29 #include <linux/errno.h>
31 #include <linux/inet.h>
32 #include <linux/inetdevice.h>
33 #include <linux/netdevice.h>
34 #include <linux/if_addr.h>
35 #include <linux/if_arp.h>
36 #include <linux/skbuff.h>
37 #include <linux/init.h>
38 #include <linux/list.h>
41 #include <net/protocol.h>
42 #include <net/route.h>
47 #include <net/ip_fib.h>
48 #include <net/rtnetlink.h>
50 #define FFprint(a...) printk(KERN_DEBUG a)
52 #ifndef CONFIG_IP_MULTIPLE_TABLES
54 static int __net_init fib4_rules_init(struct net *net)
56 struct fib_table *local_table, *main_table;
58 local_table = fib_hash_init(RT_TABLE_LOCAL);
59 if (local_table == NULL)
62 main_table = fib_hash_init(RT_TABLE_MAIN);
63 if (main_table == NULL)
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]);
78 struct fib_table *fib_new_table(struct net *net, u32 id)
85 tb = fib_get_table(net, id);
88 tb = fib_hash_init(id);
91 h = id & (FIB_TABLE_HASHSZ - 1);
92 hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]);
96 struct fib_table *fib_get_table(struct net *net, u32 id)
99 struct hlist_node *node;
100 struct hlist_head *head;
105 h = id & (FIB_TABLE_HASHSZ - 1);
108 head = &net->ipv4.fib_table_hash[h];
109 hlist_for_each_entry_rcu(tb, node, head, tb_hlist) {
110 if (tb->tb_id == id) {
118 #endif /* CONFIG_IP_MULTIPLE_TABLES */
120 static void fib_flush(struct net *net)
123 struct fib_table *tb;
124 struct hlist_node *node;
125 struct hlist_head *head;
128 for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
129 head = &net->ipv4.fib_table_hash[h];
130 hlist_for_each_entry(tb, node, head, tb_hlist)
131 flushed += tb->tb_flush(tb);
139 * Find the first device with a given source address.
142 struct net_device * ip_dev_find(__be32 addr)
144 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
145 struct fib_result res;
146 struct net_device *dev = NULL;
147 struct fib_table *local_table;
149 #ifdef CONFIG_IP_MULTIPLE_TABLES
153 local_table = fib_get_table(&init_net, RT_TABLE_LOCAL);
154 if (!local_table || local_table->tb_lookup(local_table, &fl, &res))
156 if (res.type != RTN_LOCAL)
158 dev = FIB_RES_DEV(res);
168 * Find address type as if only "dev" was present in the system. If
169 * on_dev is NULL then all interfaces are taken into consideration.
171 static inline unsigned __inet_dev_addr_type(struct net *net,
172 const struct net_device *dev,
175 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
176 struct fib_result res;
177 unsigned ret = RTN_BROADCAST;
178 struct fib_table *local_table;
180 if (ipv4_is_zeronet(addr) || ipv4_is_badclass(addr))
181 return RTN_BROADCAST;
182 if (ipv4_is_multicast(addr))
183 return RTN_MULTICAST;
185 #ifdef CONFIG_IP_MULTIPLE_TABLES
189 local_table = fib_get_table(net, RT_TABLE_LOCAL);
192 if (!local_table->tb_lookup(local_table, &fl, &res)) {
193 if (!dev || dev == res.fi->fib_dev)
201 unsigned int inet_addr_type(struct net *net, __be32 addr)
203 return __inet_dev_addr_type(net, NULL, addr);
206 unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
209 return __inet_dev_addr_type(net, dev, addr);
212 /* Given (packet source, input interface) and optional (dst, oif, tos):
213 - (main) check, that source is valid i.e. not broadcast or our local
215 - figure out what "logical" interface this packet arrived
216 and calculate "specific destination" address.
217 - check, that packet arrived from expected physical interface.
220 int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
221 struct net_device *dev, __be32 *spec_dst, u32 *itag)
223 struct in_device *in_dev;
224 struct flowi fl = { .nl_u = { .ip4_u =
229 struct fib_result res;
235 in_dev = __in_dev_get_rcu(dev);
237 no_addr = in_dev->ifa_list == NULL;
238 rpf = IN_DEV_RPFILTER(in_dev);
245 if (fib_lookup(&fl, &res))
247 if (res.type != RTN_UNICAST)
249 *spec_dst = FIB_RES_PREFSRC(res);
250 fib_combine_itag(itag, &res);
251 #ifdef CONFIG_IP_ROUTE_MULTIPATH
252 if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1)
254 if (FIB_RES_DEV(res) == dev)
257 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
266 fl.oif = dev->ifindex;
269 if (fib_lookup(&fl, &res) == 0) {
270 if (res.type == RTN_UNICAST) {
271 *spec_dst = FIB_RES_PREFSRC(res);
272 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
281 *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
291 static inline __be32 sk_extract_addr(struct sockaddr *addr)
293 return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
296 static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
300 nla = (struct nlattr *) ((char *) mx + len);
301 nla->nla_type = type;
302 nla->nla_len = nla_attr_size(4);
303 *(u32 *) nla_data(nla) = value;
305 return len + nla_total_size(4);
308 static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
309 struct fib_config *cfg)
314 memset(cfg, 0, sizeof(*cfg));
315 cfg->fc_nlinfo.nl_net = net;
317 if (rt->rt_dst.sa_family != AF_INET)
318 return -EAFNOSUPPORT;
321 * Check mask for validity:
322 * a) it must be contiguous.
323 * b) destination must have all host bits clear.
324 * c) if application forgot to set correct family (AF_INET),
325 * reject request unless it is absolutely clear i.e.
326 * both family and mask are zero.
329 addr = sk_extract_addr(&rt->rt_dst);
330 if (!(rt->rt_flags & RTF_HOST)) {
331 __be32 mask = sk_extract_addr(&rt->rt_genmask);
333 if (rt->rt_genmask.sa_family != AF_INET) {
334 if (mask || rt->rt_genmask.sa_family)
335 return -EAFNOSUPPORT;
338 if (bad_mask(mask, addr))
341 plen = inet_mask_len(mask);
344 cfg->fc_dst_len = plen;
347 if (cmd != SIOCDELRT) {
348 cfg->fc_nlflags = NLM_F_CREATE;
349 cfg->fc_protocol = RTPROT_BOOT;
353 cfg->fc_priority = rt->rt_metric - 1;
355 if (rt->rt_flags & RTF_REJECT) {
356 cfg->fc_scope = RT_SCOPE_HOST;
357 cfg->fc_type = RTN_UNREACHABLE;
361 cfg->fc_scope = RT_SCOPE_NOWHERE;
362 cfg->fc_type = RTN_UNICAST;
366 struct net_device *dev;
367 char devname[IFNAMSIZ];
369 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
372 devname[IFNAMSIZ-1] = 0;
373 colon = strchr(devname, ':');
376 dev = __dev_get_by_name(net, devname);
379 cfg->fc_oif = dev->ifindex;
381 struct in_ifaddr *ifa;
382 struct in_device *in_dev = __in_dev_get_rtnl(dev);
386 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
387 if (strcmp(ifa->ifa_label, devname) == 0)
391 cfg->fc_prefsrc = ifa->ifa_local;
395 addr = sk_extract_addr(&rt->rt_gateway);
396 if (rt->rt_gateway.sa_family == AF_INET && addr) {
398 if (rt->rt_flags & RTF_GATEWAY &&
399 inet_addr_type(net, addr) == RTN_UNICAST)
400 cfg->fc_scope = RT_SCOPE_UNIVERSE;
403 if (cmd == SIOCDELRT)
406 if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
409 if (cfg->fc_scope == RT_SCOPE_NOWHERE)
410 cfg->fc_scope = RT_SCOPE_LINK;
412 if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
416 mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
420 if (rt->rt_flags & RTF_MTU)
421 len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
423 if (rt->rt_flags & RTF_WINDOW)
424 len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
426 if (rt->rt_flags & RTF_IRTT)
427 len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
430 cfg->fc_mx_len = len;
437 * Handle IP routing ioctl calls. These are used to manipulate the routing tables
440 int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
442 struct fib_config cfg;
447 case SIOCADDRT: /* Add a route */
448 case SIOCDELRT: /* Delete a route */
449 if (!capable(CAP_NET_ADMIN))
452 if (copy_from_user(&rt, arg, sizeof(rt)))
456 err = rtentry_to_fib_config(net, cmd, &rt, &cfg);
458 struct fib_table *tb;
460 if (cmd == SIOCDELRT) {
461 tb = fib_get_table(net, cfg.fc_table);
463 err = tb->tb_delete(tb, &cfg);
467 tb = fib_new_table(net, cfg.fc_table);
469 err = tb->tb_insert(tb, &cfg);
474 /* allocated by rtentry_to_fib_config() */
483 const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = {
484 [RTA_DST] = { .type = NLA_U32 },
485 [RTA_SRC] = { .type = NLA_U32 },
486 [RTA_IIF] = { .type = NLA_U32 },
487 [RTA_OIF] = { .type = NLA_U32 },
488 [RTA_GATEWAY] = { .type = NLA_U32 },
489 [RTA_PRIORITY] = { .type = NLA_U32 },
490 [RTA_PREFSRC] = { .type = NLA_U32 },
491 [RTA_METRICS] = { .type = NLA_NESTED },
492 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
493 [RTA_PROTOINFO] = { .type = NLA_U32 },
494 [RTA_FLOW] = { .type = NLA_U32 },
497 static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
498 struct nlmsghdr *nlh, struct fib_config *cfg)
504 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy);
508 memset(cfg, 0, sizeof(*cfg));
510 rtm = nlmsg_data(nlh);
511 cfg->fc_dst_len = rtm->rtm_dst_len;
512 cfg->fc_tos = rtm->rtm_tos;
513 cfg->fc_table = rtm->rtm_table;
514 cfg->fc_protocol = rtm->rtm_protocol;
515 cfg->fc_scope = rtm->rtm_scope;
516 cfg->fc_type = rtm->rtm_type;
517 cfg->fc_flags = rtm->rtm_flags;
518 cfg->fc_nlflags = nlh->nlmsg_flags;
520 cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
521 cfg->fc_nlinfo.nlh = nlh;
522 cfg->fc_nlinfo.nl_net = net;
524 if (cfg->fc_type > RTN_MAX) {
529 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
530 switch (nla_type(attr)) {
532 cfg->fc_dst = nla_get_be32(attr);
535 cfg->fc_oif = nla_get_u32(attr);
538 cfg->fc_gw = nla_get_be32(attr);
541 cfg->fc_priority = nla_get_u32(attr);
544 cfg->fc_prefsrc = nla_get_be32(attr);
547 cfg->fc_mx = nla_data(attr);
548 cfg->fc_mx_len = nla_len(attr);
551 cfg->fc_mp = nla_data(attr);
552 cfg->fc_mp_len = nla_len(attr);
555 cfg->fc_flow = nla_get_u32(attr);
558 cfg->fc_table = nla_get_u32(attr);
568 static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
570 struct net *net = skb->sk->sk_net;
571 struct fib_config cfg;
572 struct fib_table *tb;
575 err = rtm_to_fib_config(net, skb, nlh, &cfg);
579 tb = fib_get_table(net, cfg.fc_table);
585 err = tb->tb_delete(tb, &cfg);
590 static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
592 struct net *net = skb->sk->sk_net;
593 struct fib_config cfg;
594 struct fib_table *tb;
597 err = rtm_to_fib_config(net, skb, nlh, &cfg);
601 tb = fib_new_table(net, cfg.fc_table);
607 err = tb->tb_insert(tb, &cfg);
612 static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
614 struct net *net = skb->sk->sk_net;
616 unsigned int e = 0, s_e;
617 struct fib_table *tb;
618 struct hlist_node *node;
619 struct hlist_head *head;
622 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
623 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
624 return ip_rt_dump(skb, cb);
629 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
631 head = &net->ipv4.fib_table_hash[h];
632 hlist_for_each_entry(tb, node, head, tb_hlist) {
636 memset(&cb->args[2], 0, sizeof(cb->args) -
637 2 * sizeof(cb->args[0]));
638 if (tb->tb_dump(tb, skb, cb) < 0)
652 /* Prepare and feed intra-kernel routing request.
653 Really, it should be netlink message, but :-( netlink
654 can be not configured, so that we feed it directly
655 to fib engine. It is legal, because all events occur
656 only when netlink is already locked.
659 static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
661 struct net *net = ifa->ifa_dev->dev->nd_net;
662 struct fib_table *tb;
663 struct fib_config cfg = {
664 .fc_protocol = RTPROT_KERNEL,
667 .fc_dst_len = dst_len,
668 .fc_prefsrc = ifa->ifa_local,
669 .fc_oif = ifa->ifa_dev->dev->ifindex,
670 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
676 if (type == RTN_UNICAST)
677 tb = fib_new_table(net, RT_TABLE_MAIN);
679 tb = fib_new_table(net, RT_TABLE_LOCAL);
684 cfg.fc_table = tb->tb_id;
686 if (type != RTN_LOCAL)
687 cfg.fc_scope = RT_SCOPE_LINK;
689 cfg.fc_scope = RT_SCOPE_HOST;
691 if (cmd == RTM_NEWROUTE)
692 tb->tb_insert(tb, &cfg);
694 tb->tb_delete(tb, &cfg);
697 void fib_add_ifaddr(struct in_ifaddr *ifa)
699 struct in_device *in_dev = ifa->ifa_dev;
700 struct net_device *dev = in_dev->dev;
701 struct in_ifaddr *prim = ifa;
702 __be32 mask = ifa->ifa_mask;
703 __be32 addr = ifa->ifa_local;
704 __be32 prefix = ifa->ifa_address&mask;
706 if (ifa->ifa_flags&IFA_F_SECONDARY) {
707 prim = inet_ifa_byprefix(in_dev, prefix, mask);
709 printk(KERN_DEBUG "fib_add_ifaddr: bug: prim == NULL\n");
714 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
716 if (!(dev->flags&IFF_UP))
719 /* Add broadcast address, if it is explicitly assigned. */
720 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
721 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
723 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) &&
724 (prefix != addr || ifa->ifa_prefixlen < 32)) {
725 fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
726 RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim);
728 /* Add network specific broadcasts, when it takes a sense */
729 if (ifa->ifa_prefixlen < 31) {
730 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
731 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim);
736 static void fib_del_ifaddr(struct in_ifaddr *ifa)
738 struct in_device *in_dev = ifa->ifa_dev;
739 struct net_device *dev = in_dev->dev;
740 struct in_ifaddr *ifa1;
741 struct in_ifaddr *prim = ifa;
742 __be32 brd = ifa->ifa_address|~ifa->ifa_mask;
743 __be32 any = ifa->ifa_address&ifa->ifa_mask;
750 if (!(ifa->ifa_flags&IFA_F_SECONDARY))
751 fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL :
752 RTN_UNICAST, any, ifa->ifa_prefixlen, prim);
754 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
756 printk(KERN_DEBUG "fib_del_ifaddr: bug: prim == NULL\n");
761 /* Deletion is more complicated than add.
762 We should take care of not to delete too much :-)
764 Scan address list to be sure that addresses are really gone.
767 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
768 if (ifa->ifa_local == ifa1->ifa_local)
770 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
772 if (brd == ifa1->ifa_broadcast)
774 if (any == ifa1->ifa_broadcast)
779 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
781 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
783 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
784 if (!(ok&LOCAL_OK)) {
785 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
787 /* Check, that this local address finally disappeared. */
788 if (inet_addr_type(dev->nd_net, ifa->ifa_local) != RTN_LOCAL) {
789 /* And the last, but not the least thing.
790 We must flush stray FIB entries.
792 First of all, we scan fib_info list searching
793 for stray nexthop entries, then ignite fib_flush.
795 if (fib_sync_down(ifa->ifa_local, NULL, 0))
796 fib_flush(dev->nd_net);
805 static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb )
808 struct fib_result res;
809 struct flowi fl = { .mark = frn->fl_mark,
810 .nl_u = { .ip4_u = { .daddr = frn->fl_addr,
812 .scope = frn->fl_scope } } };
814 #ifdef CONFIG_IP_MULTIPLE_TABLES
822 frn->tb_id = tb->tb_id;
823 frn->err = tb->tb_lookup(tb, &fl, &res);
826 frn->prefixlen = res.prefixlen;
827 frn->nh_sel = res.nh_sel;
828 frn->type = res.type;
829 frn->scope = res.scope;
836 static void nl_fib_input(struct sk_buff *skb)
839 struct fib_result_nl *frn;
840 struct nlmsghdr *nlh;
841 struct fib_table *tb;
844 net = skb->sk->sk_net;
845 nlh = nlmsg_hdr(skb);
846 if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
847 nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn)))
850 skb = skb_clone(skb, GFP_KERNEL);
853 nlh = nlmsg_hdr(skb);
855 frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
856 tb = fib_get_table(net, frn->tb_id_in);
858 nl_fib_lookup(frn, tb);
860 pid = NETLINK_CB(skb).pid; /* pid of sending process */
861 NETLINK_CB(skb).pid = 0; /* from kernel */
862 NETLINK_CB(skb).dst_group = 0; /* unicast */
863 netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT);
866 static int nl_fib_lookup_init(struct net *net)
869 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0,
870 nl_fib_input, NULL, THIS_MODULE);
872 return -EAFNOSUPPORT;
873 /* Don't hold an extra reference on the namespace */
875 net->ipv4.fibnl = sk;
879 static void nl_fib_lookup_exit(struct net *net)
881 /* At the last minute lie and say this is a socket for the
882 * initial network namespace. So the socket will be safe to free.
884 net->ipv4.fibnl->sk_net = get_net(&init_net);
885 sock_put(net->ipv4.fibnl);
888 static void fib_disable_ip(struct net_device *dev, int force)
890 if (fib_sync_down(0, dev, force))
891 fib_flush(dev->nd_net);
896 static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
898 struct in_ifaddr *ifa = (struct in_ifaddr*)ptr;
903 #ifdef CONFIG_IP_ROUTE_MULTIPATH
904 fib_sync_up(ifa->ifa_dev->dev);
910 if (ifa->ifa_dev->ifa_list == NULL) {
911 /* Last address was deleted from this interface.
914 fib_disable_ip(ifa->ifa_dev->dev, 1);
923 static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
925 struct net_device *dev = ptr;
926 struct in_device *in_dev = __in_dev_get_rtnl(dev);
928 if (event == NETDEV_UNREGISTER) {
929 fib_disable_ip(dev, 2);
940 } endfor_ifa(in_dev);
941 #ifdef CONFIG_IP_ROUTE_MULTIPATH
947 fib_disable_ip(dev, 0);
949 case NETDEV_CHANGEMTU:
957 static struct notifier_block fib_inetaddr_notifier = {
958 .notifier_call =fib_inetaddr_event,
961 static struct notifier_block fib_netdev_notifier = {
962 .notifier_call =fib_netdev_event,
965 static int __net_init ip_fib_net_init(struct net *net)
969 net->ipv4.fib_table_hash = kzalloc(
970 sizeof(struct hlist_head)*FIB_TABLE_HASHSZ, GFP_KERNEL);
971 if (net->ipv4.fib_table_hash == NULL)
974 for (i = 0; i < FIB_TABLE_HASHSZ; i++)
975 INIT_HLIST_HEAD(&net->ipv4.fib_table_hash[i]);
977 return fib4_rules_init(net);
980 static void __net_exit ip_fib_net_exit(struct net *net)
984 #ifdef CONFIG_IP_MULTIPLE_TABLES
985 fib4_rules_exit(net);
988 for (i = 0; i < FIB_TABLE_HASHSZ; i++) {
989 struct fib_table *tb;
990 struct hlist_head *head;
991 struct hlist_node *node, *tmp;
993 head = &net->ipv4.fib_table_hash[i];
994 hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) {
1000 kfree(net->ipv4.fib_table_hash);
1003 static int __net_init fib_net_init(struct net *net)
1007 error = ip_fib_net_init(net);
1010 error = nl_fib_lookup_init(net);
1013 error = fib_proc_init(net);
1020 nl_fib_lookup_exit(net);
1022 ip_fib_net_exit(net);
1026 static void __net_exit fib_net_exit(struct net *net)
1029 nl_fib_lookup_exit(net);
1030 ip_fib_net_exit(net);
1033 static struct pernet_operations fib_net_ops = {
1034 .init = fib_net_init,
1035 .exit = fib_net_exit,
1038 void __init ip_fib_init(void)
1040 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL);
1041 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL);
1042 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib);
1044 register_pernet_subsys(&fib_net_ops);
1045 register_netdevice_notifier(&fib_netdev_notifier);
1046 register_inetaddr_notifier(&fib_inetaddr_notifier);
1049 EXPORT_SYMBOL(inet_addr_type);
1050 EXPORT_SYMBOL(inet_dev_addr_type);
1051 EXPORT_SYMBOL(ip_dev_find);