blob: 68c93d1bb03adb9fef46ff264a783dad82a962ea [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/module.h>
17#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/bitops.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080019#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/types.h>
21#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#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>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020029#include <linux/inetdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/netdevice.h>
Thomas Graf18237302006-08-04 23:04:54 -070031#include <linux/if_addr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/if_arp.h>
33#include <linux/skbuff.h>
David S. Miller7a9bc9b2012-06-29 01:32:45 -070034#include <linux/cache.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/init.h>
Patrick McHardy1af5a8c2006-08-10 23:10:46 -070036#include <linux/list.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <net/arp.h>
45#include <net/ip_fib.h>
Thomas Graf63f34442007-03-22 11:55:17 -070046#include <net/rtnetlink.h>
Michael Smith990078a2011-04-07 04:51:51 +000047#include <net/xfrm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#ifndef CONFIG_IP_MULTIPLE_TABLES
50
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -080051static int __net_init fib4_rules_init(struct net *net)
Pavel Emelyanovc3e9a352007-11-06 23:34:04 -080052{
Denis V. Lunev93456b62008-01-10 03:23:38 -080053 struct fib_table *local_table, *main_table;
54
David S. Miller5348ba82011-02-01 15:30:56 -080055 local_table = fib_trie_table(RT_TABLE_LOCAL);
Denis V. Lunev93456b62008-01-10 03:23:38 -080056 if (local_table == NULL)
Denis V. Lunevdbb50162008-01-10 03:21:49 -080057 return -ENOMEM;
58
David S. Miller5348ba82011-02-01 15:30:56 -080059 main_table = fib_trie_table(RT_TABLE_MAIN);
Denis V. Lunev93456b62008-01-10 03:23:38 -080060 if (main_table == NULL)
Denis V. Lunevdbb50162008-01-10 03:21:49 -080061 goto fail;
62
Denis V. Lunev93456b62008-01-10 03:23:38 -080063 hlist_add_head_rcu(&local_table->tb_hlist,
Denis V. Luneve4aef8a2008-01-10 03:28:24 -080064 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]);
Denis V. Lunev93456b62008-01-10 03:23:38 -080065 hlist_add_head_rcu(&main_table->tb_hlist,
Denis V. Luneve4aef8a2008-01-10 03:28:24 -080066 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]);
Denis V. Lunevdbb50162008-01-10 03:21:49 -080067 return 0;
68
69fail:
Denis V. Lunev93456b62008-01-10 03:23:38 -080070 kfree(local_table);
Denis V. Lunevdbb50162008-01-10 03:21:49 -080071 return -ENOMEM;
Pavel Emelyanovc3e9a352007-11-06 23:34:04 -080072}
Linus Torvalds1da177e2005-04-16 15:20:36 -070073#else
74
Denis V. Lunev8ad49422008-01-10 03:24:11 -080075struct fib_table *fib_new_table(struct net *net, u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076{
77 struct fib_table *tb;
Patrick McHardy1af5a8c2006-08-10 23:10:46 -070078 unsigned int h;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Patrick McHardy1af5a8c2006-08-10 23:10:46 -070080 if (id == 0)
81 id = RT_TABLE_MAIN;
Denis V. Lunev8ad49422008-01-10 03:24:11 -080082 tb = fib_get_table(net, id);
Patrick McHardy1af5a8c2006-08-10 23:10:46 -070083 if (tb)
84 return tb;
Stephen Hemminger7f9b8052008-01-14 23:14:20 -080085
David S. Miller5348ba82011-02-01 15:30:56 -080086 tb = fib_trie_table(id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 if (!tb)
88 return NULL;
David S. Millerf4530fa2012-07-05 22:13:13 -070089
90 switch (id) {
91 case RT_TABLE_LOCAL:
92 net->ipv4.fib_local = tb;
93 break;
94
95 case RT_TABLE_MAIN:
96 net->ipv4.fib_main = tb;
97 break;
98
99 case RT_TABLE_DEFAULT:
100 net->ipv4.fib_default = tb;
101 break;
102
103 default:
104 break;
105 }
106
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700107 h = id & (FIB_TABLE_HASHSZ - 1);
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800108 hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return tb;
110}
111
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800112struct fib_table *fib_get_table(struct net *net, u32 id)
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700113{
114 struct fib_table *tb;
115 struct hlist_node *node;
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800116 struct hlist_head *head;
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700117 unsigned int h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700119 if (id == 0)
120 id = RT_TABLE_MAIN;
121 h = id & (FIB_TABLE_HASHSZ - 1);
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800122
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700123 rcu_read_lock();
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800124 head = &net->ipv4.fib_table_hash[h];
125 hlist_for_each_entry_rcu(tb, node, head, tb_hlist) {
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700126 if (tb->tb_id == id) {
127 rcu_read_unlock();
128 return tb;
129 }
130 }
131 rcu_read_unlock();
132 return NULL;
133}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134#endif /* CONFIG_IP_MULTIPLE_TABLES */
135
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800136static void fib_flush(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137{
138 int flushed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 struct fib_table *tb;
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700140 struct hlist_node *node;
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800141 struct hlist_head *head;
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700142 unsigned int h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700144 for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800145 head = &net->ipv4.fib_table_hash[h];
146 hlist_for_each_entry(tb, node, head, tb_hlist)
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000147 flushed += fib_table_flush(tb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
150 if (flushed)
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +0000151 rt_cache_flush(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152}
153
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800154/*
155 * Find address type as if only "dev" was present in the system. If
156 * on_dev is NULL then all interfaces are taken into consideration.
157 */
Eric Dumazet95c96172012-04-15 05:58:06 +0000158static inline unsigned int __inet_dev_addr_type(struct net *net,
159 const struct net_device *dev,
160 __be32 addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
David S. Miller9ade2282011-03-12 02:02:42 -0500162 struct flowi4 fl4 = { .daddr = addr };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 struct fib_result res;
Eric Dumazet95c96172012-04-15 05:58:06 +0000164 unsigned int ret = RTN_BROADCAST;
Pavel Emelyanov03cf7862007-10-23 21:17:27 -0700165 struct fib_table *local_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Jan Engelhardt1e637c72008-01-21 03:18:08 -0800167 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 return RTN_BROADCAST;
Joe Perchesf97c1e02007-12-16 13:45:43 -0800169 if (ipv4_is_multicast(addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 return RTN_MULTICAST;
171
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800172 local_table = fib_get_table(net, RT_TABLE_LOCAL);
Pavel Emelyanov03cf7862007-10-23 21:17:27 -0700173 if (local_table) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 ret = RTN_UNICAST;
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000175 rcu_read_lock();
David S. Miller9ade2282011-03-12 02:02:42 -0500176 if (!fib_table_lookup(local_table, &fl4, &res, FIB_LOOKUP_NOREF)) {
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800177 if (!dev || dev == res.fi->fib_dev)
178 ret = res.type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000180 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 }
182 return ret;
183}
184
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800185unsigned int inet_addr_type(struct net *net, __be32 addr)
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800186{
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800187 return __inet_dev_addr_type(net, NULL, addr);
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800188}
Eric Dumazet4bc2f182010-07-09 21:22:10 +0000189EXPORT_SYMBOL(inet_addr_type);
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800190
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800191unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
192 __be32 addr)
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800193{
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000194 return __inet_dev_addr_type(net, dev, addr);
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800195}
Eric Dumazet4bc2f182010-07-09 21:22:10 +0000196EXPORT_SYMBOL(inet_dev_addr_type);
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800197
David S. Miller35ebf652012-06-28 03:59:11 -0700198__be32 fib_compute_spec_dst(struct sk_buff *skb)
199{
200 struct net_device *dev = skb->dev;
201 struct in_device *in_dev;
202 struct fib_result res;
David S. Millera207a4b2012-06-28 18:33:24 -0700203 struct rtable *rt;
David S. Miller35ebf652012-06-28 03:59:11 -0700204 struct flowi4 fl4;
205 struct net *net;
David S. Millera207a4b2012-06-28 18:33:24 -0700206 int scope;
David S. Miller35ebf652012-06-28 03:59:11 -0700207
David S. Millera207a4b2012-06-28 18:33:24 -0700208 rt = skb_rtable(skb);
Julian Anastasov0cc535a2012-07-18 21:35:03 +0000209 if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) ==
210 RTCF_LOCAL)
David S. Miller35ebf652012-06-28 03:59:11 -0700211 return ip_hdr(skb)->daddr;
212
213 in_dev = __in_dev_get_rcu(dev);
214 BUG_ON(!in_dev);
David S. Miller35ebf652012-06-28 03:59:11 -0700215
216 net = dev_net(dev);
David S. Millera207a4b2012-06-28 18:33:24 -0700217
218 scope = RT_SCOPE_UNIVERSE;
219 if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) {
220 fl4.flowi4_oif = 0;
Pavel Emelyanov1fb94892012-08-08 21:53:36 +0000221 fl4.flowi4_iif = LOOPBACK_IFINDEX;
David S. Millera207a4b2012-06-28 18:33:24 -0700222 fl4.daddr = ip_hdr(skb)->saddr;
223 fl4.saddr = 0;
224 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
225 fl4.flowi4_scope = scope;
226 fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0;
227 if (!fib_lookup(net, &fl4, &res))
228 return FIB_RES_PREFSRC(net, res);
229 } else {
230 scope = RT_SCOPE_LINK;
231 }
232
233 return inet_select_addr(dev, ip_hdr(skb)->saddr, scope);
David S. Miller35ebf652012-06-28 03:59:11 -0700234}
235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236/* Given (packet source, input interface) and optional (dst, oif, tos):
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000237 * - (main) check, that source is valid i.e. not broadcast or our local
238 * address.
239 * - figure out what "logical" interface this packet arrived
240 * and calculate "specific destination" address.
241 * - check, that packet arrived from expected physical interface.
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000242 * called with rcu_read_lock()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 */
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700244static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
245 u8 tos, int oif, struct net_device *dev,
246 int rpf, struct in_device *idev, u32 *itag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700248 int ret, no_addr, accept_local;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 struct fib_result res;
David S. Miller9e56e382012-06-28 18:54:02 -0700250 struct flowi4 fl4;
Denis V. Lunev5b707aa2008-01-21 17:33:15 -0800251 struct net *net;
David S. Miller9e56e382012-06-28 18:54:02 -0700252 bool dev_match;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
David S. Miller9ade2282011-03-12 02:02:42 -0500254 fl4.flowi4_oif = 0;
255 fl4.flowi4_iif = oif;
David S. Miller9ade2282011-03-12 02:02:42 -0500256 fl4.daddr = src;
257 fl4.saddr = dst;
258 fl4.flowi4_tos = tos;
259 fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
David S. Millercc7e17e2011-03-09 20:57:50 -0800260
David S. Miller9e56e382012-06-28 18:54:02 -0700261 no_addr = idev->ifa_list == NULL;
Michael Smith990078a2011-04-07 04:51:51 +0000262
David S. Miller9e56e382012-06-28 18:54:02 -0700263 accept_local = IN_DEV_ACCEPT_LOCAL(idev);
264 fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900266 net = dev_net(dev);
David S. Miller9ade2282011-03-12 02:02:42 -0500267 if (fib_lookup(net, &fl4, &res))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 goto last_resort;
Patrick McHardy8153a102009-12-03 01:25:58 +0000269 if (res.type != RTN_UNICAST) {
270 if (res.type != RTN_LOCAL || !accept_local)
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000271 goto e_inval;
Patrick McHardy8153a102009-12-03 01:25:58 +0000272 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 fib_combine_itag(itag, &res);
David S. Miller6f86b322010-09-06 22:36:19 -0700274 dev_match = false;
275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276#ifdef CONFIG_IP_ROUTE_MULTIPATH
David S. Miller6f86b322010-09-06 22:36:19 -0700277 for (ret = 0; ret < res.fi->fib_nhs; ret++) {
278 struct fib_nh *nh = &res.fi->fib_nh[ret];
279
280 if (nh->nh_dev == dev) {
281 dev_match = true;
282 break;
283 }
284 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285#else
286 if (FIB_RES_DEV(res) == dev)
David S. Miller6f86b322010-09-06 22:36:19 -0700287 dev_match = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288#endif
David S. Miller6f86b322010-09-06 22:36:19 -0700289 if (dev_match) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 return ret;
292 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 if (no_addr)
294 goto last_resort;
Stephen Hemmingerc1cf8422009-02-20 08:25:36 +0000295 if (rpf == 1)
Eric Dumazetb5f7e752010-06-02 12:05:27 +0000296 goto e_rpf;
David S. Miller9ade2282011-03-12 02:02:42 -0500297 fl4.flowi4_oif = dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
299 ret = 0;
David S. Miller9ade2282011-03-12 02:02:42 -0500300 if (fib_lookup(net, &fl4, &res) == 0) {
David S. Miller41347dc2012-06-28 04:05:27 -0700301 if (res.type == RTN_UNICAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 }
304 return ret;
305
306last_resort:
307 if (rpf)
Eric Dumazetb5f7e752010-06-02 12:05:27 +0000308 goto e_rpf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 *itag = 0;
310 return 0;
311
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312e_inval:
313 return -EINVAL;
Eric Dumazetb5f7e752010-06-02 12:05:27 +0000314e_rpf:
315 return -EXDEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316}
317
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700318/* Ignore rp_filter for packets protected by IPsec. */
319int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
320 u8 tos, int oif, struct net_device *dev,
321 struct in_device *idev, u32 *itag)
322{
323 int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev);
324
David S. Millerf4530fa2012-07-05 22:13:13 -0700325 if (!r && !fib_num_tclassid_users(dev_net(dev))) {
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700326 *itag = 0;
327 return 0;
328 }
329 return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag);
330}
331
Al Viro81f7bf62006-09-27 18:40:00 -0700332static inline __be32 sk_extract_addr(struct sockaddr *addr)
Thomas Graf4e902c52006-08-17 18:14:52 -0700333{
334 return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
335}
336
337static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
338{
339 struct nlattr *nla;
340
341 nla = (struct nlattr *) ((char *) mx + len);
342 nla->nla_type = type;
343 nla->nla_len = nla_attr_size(4);
344 *(u32 *) nla_data(nla) = value;
345
346 return len + nla_total_size(4);
347}
348
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800349static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
Thomas Graf4e902c52006-08-17 18:14:52 -0700350 struct fib_config *cfg)
351{
Al Viro6d85c102006-09-26 22:15:46 -0700352 __be32 addr;
Thomas Graf4e902c52006-08-17 18:14:52 -0700353 int plen;
354
355 memset(cfg, 0, sizeof(*cfg));
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800356 cfg->fc_nlinfo.nl_net = net;
Thomas Graf4e902c52006-08-17 18:14:52 -0700357
358 if (rt->rt_dst.sa_family != AF_INET)
359 return -EAFNOSUPPORT;
360
361 /*
362 * Check mask for validity:
363 * a) it must be contiguous.
364 * b) destination must have all host bits clear.
365 * c) if application forgot to set correct family (AF_INET),
366 * reject request unless it is absolutely clear i.e.
367 * both family and mask are zero.
368 */
369 plen = 32;
370 addr = sk_extract_addr(&rt->rt_dst);
371 if (!(rt->rt_flags & RTF_HOST)) {
Al Viro81f7bf62006-09-27 18:40:00 -0700372 __be32 mask = sk_extract_addr(&rt->rt_genmask);
Thomas Graf4e902c52006-08-17 18:14:52 -0700373
374 if (rt->rt_genmask.sa_family != AF_INET) {
375 if (mask || rt->rt_genmask.sa_family)
376 return -EAFNOSUPPORT;
377 }
378
379 if (bad_mask(mask, addr))
380 return -EINVAL;
381
382 plen = inet_mask_len(mask);
383 }
384
385 cfg->fc_dst_len = plen;
386 cfg->fc_dst = addr;
387
388 if (cmd != SIOCDELRT) {
389 cfg->fc_nlflags = NLM_F_CREATE;
390 cfg->fc_protocol = RTPROT_BOOT;
391 }
392
393 if (rt->rt_metric)
394 cfg->fc_priority = rt->rt_metric - 1;
395
396 if (rt->rt_flags & RTF_REJECT) {
397 cfg->fc_scope = RT_SCOPE_HOST;
398 cfg->fc_type = RTN_UNREACHABLE;
399 return 0;
400 }
401
402 cfg->fc_scope = RT_SCOPE_NOWHERE;
403 cfg->fc_type = RTN_UNICAST;
404
405 if (rt->rt_dev) {
406 char *colon;
407 struct net_device *dev;
408 char devname[IFNAMSIZ];
409
410 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
411 return -EFAULT;
412
413 devname[IFNAMSIZ-1] = 0;
414 colon = strchr(devname, ':');
415 if (colon)
416 *colon = 0;
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800417 dev = __dev_get_by_name(net, devname);
Thomas Graf4e902c52006-08-17 18:14:52 -0700418 if (!dev)
419 return -ENODEV;
420 cfg->fc_oif = dev->ifindex;
421 if (colon) {
422 struct in_ifaddr *ifa;
423 struct in_device *in_dev = __in_dev_get_rtnl(dev);
424 if (!in_dev)
425 return -ENODEV;
426 *colon = ':';
427 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
428 if (strcmp(ifa->ifa_label, devname) == 0)
429 break;
430 if (ifa == NULL)
431 return -ENODEV;
432 cfg->fc_prefsrc = ifa->ifa_local;
433 }
434 }
435
436 addr = sk_extract_addr(&rt->rt_gateway);
437 if (rt->rt_gateway.sa_family == AF_INET && addr) {
438 cfg->fc_gw = addr;
439 if (rt->rt_flags & RTF_GATEWAY &&
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800440 inet_addr_type(net, addr) == RTN_UNICAST)
Thomas Graf4e902c52006-08-17 18:14:52 -0700441 cfg->fc_scope = RT_SCOPE_UNIVERSE;
442 }
443
444 if (cmd == SIOCDELRT)
445 return 0;
446
447 if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
448 return -EINVAL;
449
450 if (cfg->fc_scope == RT_SCOPE_NOWHERE)
451 cfg->fc_scope = RT_SCOPE_LINK;
452
453 if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
454 struct nlattr *mx;
455 int len = 0;
456
457 mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900458 if (mx == NULL)
Thomas Graf4e902c52006-08-17 18:14:52 -0700459 return -ENOMEM;
460
461 if (rt->rt_flags & RTF_MTU)
462 len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
463
464 if (rt->rt_flags & RTF_WINDOW)
465 len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
466
467 if (rt->rt_flags & RTF_IRTT)
468 len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
469
470 cfg->fc_mx = mx;
471 cfg->fc_mx_len = len;
472 }
473
474 return 0;
475}
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477/*
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000478 * Handle IP routing ioctl calls.
479 * These are used to manipulate the routing tables
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 */
Denis V. Lunev1bad1182008-01-10 03:29:53 -0800481int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482{
Thomas Graf4e902c52006-08-17 18:14:52 -0700483 struct fib_config cfg;
484 struct rtentry rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
487 switch (cmd) {
488 case SIOCADDRT: /* Add a route */
489 case SIOCDELRT: /* Delete a route */
490 if (!capable(CAP_NET_ADMIN))
491 return -EPERM;
Thomas Graf4e902c52006-08-17 18:14:52 -0700492
493 if (copy_from_user(&rt, arg, sizeof(rt)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 return -EFAULT;
Thomas Graf4e902c52006-08-17 18:14:52 -0700495
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 rtnl_lock();
Denis V. Lunev1bad1182008-01-10 03:29:53 -0800497 err = rtentry_to_fib_config(net, cmd, &rt, &cfg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 if (err == 0) {
Thomas Graf4e902c52006-08-17 18:14:52 -0700499 struct fib_table *tb;
500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 if (cmd == SIOCDELRT) {
Denis V. Lunev1bad1182008-01-10 03:29:53 -0800502 tb = fib_get_table(net, cfg.fc_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 if (tb)
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000504 err = fib_table_delete(tb, &cfg);
Thomas Graf4e902c52006-08-17 18:14:52 -0700505 else
506 err = -ESRCH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 } else {
Denis V. Lunev1bad1182008-01-10 03:29:53 -0800508 tb = fib_new_table(net, cfg.fc_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 if (tb)
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000510 err = fib_table_insert(tb, &cfg);
Thomas Graf4e902c52006-08-17 18:14:52 -0700511 else
512 err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 }
Thomas Graf4e902c52006-08-17 18:14:52 -0700514
515 /* allocated by rtentry_to_fib_config() */
516 kfree(cfg.fc_mx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 }
518 rtnl_unlock();
519 return err;
520 }
521 return -EINVAL;
522}
523
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000524const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
Thomas Graf4e902c52006-08-17 18:14:52 -0700525 [RTA_DST] = { .type = NLA_U32 },
526 [RTA_SRC] = { .type = NLA_U32 },
527 [RTA_IIF] = { .type = NLA_U32 },
528 [RTA_OIF] = { .type = NLA_U32 },
529 [RTA_GATEWAY] = { .type = NLA_U32 },
530 [RTA_PRIORITY] = { .type = NLA_U32 },
531 [RTA_PREFSRC] = { .type = NLA_U32 },
532 [RTA_METRICS] = { .type = NLA_NESTED },
Thomas Graf5176f912006-08-26 20:13:18 -0700533 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
Thomas Graf4e902c52006-08-17 18:14:52 -0700534 [RTA_FLOW] = { .type = NLA_U32 },
Thomas Graf4e902c52006-08-17 18:14:52 -0700535};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800537static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000538 struct nlmsghdr *nlh, struct fib_config *cfg)
Thomas Graf4e902c52006-08-17 18:14:52 -0700539{
540 struct nlattr *attr;
541 int err, remaining;
542 struct rtmsg *rtm;
543
544 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy);
545 if (err < 0)
546 goto errout;
547
548 memset(cfg, 0, sizeof(*cfg));
549
550 rtm = nlmsg_data(nlh);
Thomas Graf4e902c52006-08-17 18:14:52 -0700551 cfg->fc_dst_len = rtm->rtm_dst_len;
Thomas Graf4e902c52006-08-17 18:14:52 -0700552 cfg->fc_tos = rtm->rtm_tos;
553 cfg->fc_table = rtm->rtm_table;
554 cfg->fc_protocol = rtm->rtm_protocol;
555 cfg->fc_scope = rtm->rtm_scope;
556 cfg->fc_type = rtm->rtm_type;
557 cfg->fc_flags = rtm->rtm_flags;
558 cfg->fc_nlflags = nlh->nlmsg_flags;
559
Eric W. Biederman15e47302012-09-07 20:12:54 +0000560 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
Thomas Graf4e902c52006-08-17 18:14:52 -0700561 cfg->fc_nlinfo.nlh = nlh;
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800562 cfg->fc_nlinfo.nl_net = net;
Thomas Graf4e902c52006-08-17 18:14:52 -0700563
Thomas Grafa0ee18b2007-03-24 20:32:54 -0700564 if (cfg->fc_type > RTN_MAX) {
565 err = -EINVAL;
566 goto errout;
567 }
568
Thomas Graf4e902c52006-08-17 18:14:52 -0700569 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
Thomas Graf8f4c1f92007-09-12 14:44:36 +0200570 switch (nla_type(attr)) {
Thomas Graf4e902c52006-08-17 18:14:52 -0700571 case RTA_DST:
Al Viro17fb2c62006-09-26 22:15:25 -0700572 cfg->fc_dst = nla_get_be32(attr);
Thomas Graf4e902c52006-08-17 18:14:52 -0700573 break;
Thomas Graf4e902c52006-08-17 18:14:52 -0700574 case RTA_OIF:
575 cfg->fc_oif = nla_get_u32(attr);
576 break;
577 case RTA_GATEWAY:
Al Viro17fb2c62006-09-26 22:15:25 -0700578 cfg->fc_gw = nla_get_be32(attr);
Thomas Graf4e902c52006-08-17 18:14:52 -0700579 break;
580 case RTA_PRIORITY:
581 cfg->fc_priority = nla_get_u32(attr);
582 break;
583 case RTA_PREFSRC:
Al Viro17fb2c62006-09-26 22:15:25 -0700584 cfg->fc_prefsrc = nla_get_be32(attr);
Thomas Graf4e902c52006-08-17 18:14:52 -0700585 break;
586 case RTA_METRICS:
587 cfg->fc_mx = nla_data(attr);
588 cfg->fc_mx_len = nla_len(attr);
589 break;
590 case RTA_MULTIPATH:
591 cfg->fc_mp = nla_data(attr);
592 cfg->fc_mp_len = nla_len(attr);
593 break;
594 case RTA_FLOW:
595 cfg->fc_flow = nla_get_u32(attr);
596 break;
Thomas Graf4e902c52006-08-17 18:14:52 -0700597 case RTA_TABLE:
598 cfg->fc_table = nla_get_u32(attr);
599 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 }
601 }
Thomas Graf4e902c52006-08-17 18:14:52 -0700602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 return 0;
Thomas Graf4e902c52006-08-17 18:14:52 -0700604errout:
605 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606}
607
Jianjun Kong6ed25332008-11-03 00:25:16 -0800608static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900610 struct net *net = sock_net(skb->sk);
Thomas Graf4e902c52006-08-17 18:14:52 -0700611 struct fib_config cfg;
612 struct fib_table *tb;
613 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800615 err = rtm_to_fib_config(net, skb, nlh, &cfg);
Thomas Graf4e902c52006-08-17 18:14:52 -0700616 if (err < 0)
617 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800619 tb = fib_get_table(net, cfg.fc_table);
Thomas Graf4e902c52006-08-17 18:14:52 -0700620 if (tb == NULL) {
621 err = -ESRCH;
622 goto errout;
623 }
624
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000625 err = fib_table_delete(tb, &cfg);
Thomas Graf4e902c52006-08-17 18:14:52 -0700626errout:
627 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628}
629
Jianjun Kong6ed25332008-11-03 00:25:16 -0800630static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900632 struct net *net = sock_net(skb->sk);
Thomas Graf4e902c52006-08-17 18:14:52 -0700633 struct fib_config cfg;
634 struct fib_table *tb;
635 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800637 err = rtm_to_fib_config(net, skb, nlh, &cfg);
Thomas Graf4e902c52006-08-17 18:14:52 -0700638 if (err < 0)
639 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
Denis V. Lunev226b0b4a52008-01-10 03:30:24 -0800641 tb = fib_new_table(net, cfg.fc_table);
Thomas Graf4e902c52006-08-17 18:14:52 -0700642 if (tb == NULL) {
643 err = -ENOBUFS;
644 goto errout;
645 }
646
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000647 err = fib_table_insert(tb, &cfg);
Thomas Graf4e902c52006-08-17 18:14:52 -0700648errout:
649 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650}
651
Thomas Graf63f34442007-03-22 11:55:17 -0700652static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900654 struct net *net = sock_net(skb->sk);
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700655 unsigned int h, s_h;
656 unsigned int e = 0, s_e;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 struct fib_table *tb;
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700658 struct hlist_node *node;
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800659 struct hlist_head *head;
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700660 int dumped = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
Thomas Grafbe403ea2006-08-17 18:15:17 -0700662 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
663 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 return ip_rt_dump(skb, cb);
665
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700666 s_h = cb->args[0];
667 s_e = cb->args[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700669 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
670 e = 0;
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800671 head = &net->ipv4.fib_table_hash[h];
672 hlist_for_each_entry(tb, node, head, tb_hlist) {
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700673 if (e < s_e)
674 goto next;
675 if (dumped)
676 memset(&cb->args[2], 0, sizeof(cb->args) -
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900677 2 * sizeof(cb->args[0]));
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000678 if (fib_table_dump(tb, skb, cb) < 0)
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700679 goto out;
680 dumped = 1;
681next:
682 e++;
683 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 }
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700685out:
686 cb->args[1] = e;
687 cb->args[0] = h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
689 return skb->len;
690}
691
692/* Prepare and feed intra-kernel routing request.
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000693 * Really, it should be netlink message, but :-( netlink
694 * can be not configured, so that we feed it directly
695 * to fib engine. It is legal, because all events occur
696 * only when netlink is already locked.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 */
Al Viro81f7bf62006-09-27 18:40:00 -0700698static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699{
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900700 struct net *net = dev_net(ifa->ifa_dev->dev);
Thomas Graf4e902c52006-08-17 18:14:52 -0700701 struct fib_table *tb;
702 struct fib_config cfg = {
703 .fc_protocol = RTPROT_KERNEL,
704 .fc_type = type,
705 .fc_dst = dst,
706 .fc_dst_len = dst_len,
707 .fc_prefsrc = ifa->ifa_local,
708 .fc_oif = ifa->ifa_dev->dev->ifindex,
709 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
Denis V. Lunev4d1169c2008-01-10 03:26:13 -0800710 .fc_nlinfo = {
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800711 .nl_net = net,
Denis V. Lunev4d1169c2008-01-10 03:26:13 -0800712 },
Thomas Graf4e902c52006-08-17 18:14:52 -0700713 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
715 if (type == RTN_UNICAST)
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800716 tb = fib_new_table(net, RT_TABLE_MAIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 else
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800718 tb = fib_new_table(net, RT_TABLE_LOCAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
720 if (tb == NULL)
721 return;
722
Thomas Graf4e902c52006-08-17 18:14:52 -0700723 cfg.fc_table = tb->tb_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
Thomas Graf4e902c52006-08-17 18:14:52 -0700725 if (type != RTN_LOCAL)
726 cfg.fc_scope = RT_SCOPE_LINK;
727 else
728 cfg.fc_scope = RT_SCOPE_HOST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729
730 if (cmd == RTM_NEWROUTE)
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000731 fib_table_insert(tb, &cfg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 else
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000733 fib_table_delete(tb, &cfg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734}
735
Jamal Hadi Salim0ff60a42005-11-22 14:47:37 -0800736void fib_add_ifaddr(struct in_ifaddr *ifa)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737{
738 struct in_device *in_dev = ifa->ifa_dev;
739 struct net_device *dev = in_dev->dev;
740 struct in_ifaddr *prim = ifa;
Al Viroa144ea42006-09-28 18:00:55 -0700741 __be32 mask = ifa->ifa_mask;
742 __be32 addr = ifa->ifa_local;
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000743 __be32 prefix = ifa->ifa_address & mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000745 if (ifa->ifa_flags & IFA_F_SECONDARY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 prim = inet_ifa_byprefix(in_dev, prefix, mask);
747 if (prim == NULL) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000748 pr_warn("%s: bug: prim == NULL\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 return;
750 }
751 }
752
753 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
754
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000755 if (!(dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 return;
757
758 /* Add broadcast address, if it is explicitly assigned. */
Al Viroa144ea42006-09-28 18:00:55 -0700759 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
761
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000762 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 (prefix != addr || ifa->ifa_prefixlen < 32)) {
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000764 fib_magic(RTM_NEWROUTE,
765 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
766 prefix, ifa->ifa_prefixlen, prim);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
768 /* Add network specific broadcasts, when it takes a sense */
769 if (ifa->ifa_prefixlen < 31) {
770 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000771 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask,
772 32, prim);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 }
774 }
775}
776
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000777/* Delete primary or secondary address.
778 * Optionally, on secondary address promotion consider the addresses
779 * from subnet iprim as deleted, even if they are in device list.
780 * In this case the secondary ifa can be in device list.
781 */
782void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783{
784 struct in_device *in_dev = ifa->ifa_dev;
785 struct net_device *dev = in_dev->dev;
786 struct in_ifaddr *ifa1;
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000787 struct in_ifaddr *prim = ifa, *prim1 = NULL;
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000788 __be32 brd = ifa->ifa_address | ~ifa->ifa_mask;
789 __be32 any = ifa->ifa_address & ifa->ifa_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790#define LOCAL_OK 1
791#define BRD_OK 2
792#define BRD0_OK 4
793#define BRD1_OK 8
Eric Dumazet95c96172012-04-15 05:58:06 +0000794 unsigned int ok = 0;
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000795 int subnet = 0; /* Primary network */
796 int gone = 1; /* Address is missing */
797 int same_prefsrc = 0; /* Another primary with same IP */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000799 if (ifa->ifa_flags & IFA_F_SECONDARY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
801 if (prim == NULL) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000802 pr_warn("%s: bug: prim == NULL\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 return;
804 }
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000805 if (iprim && iprim != prim) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000806 pr_warn("%s: bug: iprim != prim\n", __func__);
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000807 return;
808 }
809 } else if (!ipv4_is_zeronet(any) &&
810 (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) {
811 fib_magic(RTM_DELROUTE,
812 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
813 any, ifa->ifa_prefixlen, prim);
814 subnet = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 }
816
817 /* Deletion is more complicated than add.
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000818 * We should take care of not to delete too much :-)
819 *
820 * Scan address list to be sure that addresses are really gone.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 */
822
823 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000824 if (ifa1 == ifa) {
825 /* promotion, keep the IP */
826 gone = 0;
827 continue;
828 }
829 /* Ignore IFAs from our subnet */
830 if (iprim && ifa1->ifa_mask == iprim->ifa_mask &&
831 inet_ifa_match(ifa1->ifa_address, iprim))
832 continue;
833
834 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
835 if (ifa1->ifa_flags & IFA_F_SECONDARY) {
836 /* Another address from our subnet? */
837 if (ifa1->ifa_mask == prim->ifa_mask &&
838 inet_ifa_match(ifa1->ifa_address, prim))
839 prim1 = prim;
840 else {
841 /* We reached the secondaries, so
842 * same_prefsrc should be determined.
843 */
844 if (!same_prefsrc)
845 continue;
846 /* Search new prim1 if ifa1 is not
847 * using the current prim1
848 */
849 if (!prim1 ||
850 ifa1->ifa_mask != prim1->ifa_mask ||
851 !inet_ifa_match(ifa1->ifa_address, prim1))
852 prim1 = inet_ifa_byprefix(in_dev,
853 ifa1->ifa_address,
854 ifa1->ifa_mask);
855 if (!prim1)
856 continue;
857 if (prim1->ifa_local != prim->ifa_local)
858 continue;
859 }
860 } else {
861 if (prim->ifa_local != ifa1->ifa_local)
862 continue;
863 prim1 = ifa1;
864 if (prim != prim1)
865 same_prefsrc = 1;
866 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 if (ifa->ifa_local == ifa1->ifa_local)
868 ok |= LOCAL_OK;
869 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
870 ok |= BRD_OK;
871 if (brd == ifa1->ifa_broadcast)
872 ok |= BRD1_OK;
873 if (any == ifa1->ifa_broadcast)
874 ok |= BRD0_OK;
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000875 /* primary has network specific broadcasts */
876 if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) {
877 __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask;
878 __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask;
879
880 if (!ipv4_is_zeronet(any1)) {
881 if (ifa->ifa_broadcast == brd1 ||
882 ifa->ifa_broadcast == any1)
883 ok |= BRD_OK;
884 if (brd == brd1 || brd == any1)
885 ok |= BRD1_OK;
886 if (any == brd1 || any == any1)
887 ok |= BRD0_OK;
888 }
889 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 }
891
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000892 if (!(ok & BRD_OK))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000894 if (subnet && ifa->ifa_prefixlen < 31) {
895 if (!(ok & BRD1_OK))
896 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
897 if (!(ok & BRD0_OK))
898 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
899 }
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000900 if (!(ok & LOCAL_OK)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
902
903 /* Check, that this local address finally disappeared. */
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000904 if (gone &&
905 inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 /* And the last, but not the least thing.
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000907 * We must flush stray FIB entries.
908 *
909 * First of all, we scan fib_info list searching
910 * for stray nexthop entries, then ignite fib_flush.
911 */
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900912 if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local))
913 fib_flush(dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 }
915 }
916#undef LOCAL_OK
917#undef BRD_OK
918#undef BRD0_OK
919#undef BRD1_OK
920}
921
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000922static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb)
Robert Olsson246955f2005-06-20 13:36:39 -0700923{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900924
Robert Olsson246955f2005-06-20 13:36:39 -0700925 struct fib_result res;
David S. Miller9ade2282011-03-12 02:02:42 -0500926 struct flowi4 fl4 = {
927 .flowi4_mark = frn->fl_mark,
928 .daddr = frn->fl_addr,
929 .flowi4_tos = frn->fl_tos,
930 .flowi4_scope = frn->fl_scope,
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000931 };
Alexey Kuznetsov1194ed02007-04-25 13:07:28 -0700932
933 frn->err = -ENOENT;
Robert Olsson246955f2005-06-20 13:36:39 -0700934 if (tb) {
935 local_bh_disable();
936
937 frn->tb_id = tb->tb_id;
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000938 rcu_read_lock();
David S. Miller9ade2282011-03-12 02:02:42 -0500939 frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
Robert Olsson246955f2005-06-20 13:36:39 -0700940
941 if (!frn->err) {
942 frn->prefixlen = res.prefixlen;
943 frn->nh_sel = res.nh_sel;
944 frn->type = res.type;
945 frn->scope = res.scope;
946 }
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000947 rcu_read_unlock();
Robert Olsson246955f2005-06-20 13:36:39 -0700948 local_bh_enable();
949 }
950}
951
David S. Miller28f7b0362007-10-10 21:32:39 -0700952static void nl_fib_input(struct sk_buff *skb)
Robert Olsson246955f2005-06-20 13:36:39 -0700953{
Denis V. Lunev6bd48fc2008-01-10 03:28:55 -0800954 struct net *net;
Robert Olsson246955f2005-06-20 13:36:39 -0700955 struct fib_result_nl *frn;
David S. Miller28f7b0362007-10-10 21:32:39 -0700956 struct nlmsghdr *nlh;
Robert Olsson246955f2005-06-20 13:36:39 -0700957 struct fib_table *tb;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000958 u32 portid;
Alexey Kuznetsov1194ed02007-04-25 13:07:28 -0700959
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900960 net = sock_net(skb->sk);
Arnaldo Carvalho de Melob529ccf2007-04-25 19:08:35 -0700961 nlh = nlmsg_hdr(skb);
Thomas Grafea865752005-12-01 14:30:00 -0800962 if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len ||
Denis V. Lunevd883a032007-12-21 02:01:53 -0800963 nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn)))
Thomas Grafea865752005-12-01 14:30:00 -0800964 return;
Denis V. Lunevd883a032007-12-21 02:01:53 -0800965
966 skb = skb_clone(skb, GFP_KERNEL);
967 if (skb == NULL)
968 return;
969 nlh = nlmsg_hdr(skb);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900970
Robert Olsson246955f2005-06-20 13:36:39 -0700971 frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
Denis V. Lunev6bd48fc2008-01-10 03:28:55 -0800972 tb = fib_get_table(net, frn->tb_id_in);
Robert Olsson246955f2005-06-20 13:36:39 -0700973
974 nl_fib_lookup(frn, tb);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900975
Eric W. Biederman15e47302012-09-07 20:12:54 +0000976 portid = NETLINK_CB(skb).portid; /* pid of sending process */
977 NETLINK_CB(skb).portid = 0; /* from kernel */
Patrick McHardyac6d4392005-08-14 19:29:52 -0700978 NETLINK_CB(skb).dst_group = 0; /* unicast */
Eric W. Biederman15e47302012-09-07 20:12:54 +0000979 netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900980}
Robert Olsson246955f2005-06-20 13:36:39 -0700981
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000982static int __net_init nl_fib_lookup_init(struct net *net)
Robert Olsson246955f2005-06-20 13:36:39 -0700983{
Denis V. Lunev6bd48fc2008-01-10 03:28:55 -0800984 struct sock *sk;
Pablo Neira Ayusoa31f2d12012-06-29 06:15:21 +0000985 struct netlink_kernel_cfg cfg = {
986 .input = nl_fib_input,
987 };
988
Pablo Neira Ayuso9f00d972012-09-08 02:53:54 +0000989 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg);
Denis V. Lunev6bd48fc2008-01-10 03:28:55 -0800990 if (sk == NULL)
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -0800991 return -EAFNOSUPPORT;
Denis V. Lunev6bd48fc2008-01-10 03:28:55 -0800992 net->ipv4.fibnl = sk;
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -0800993 return 0;
994}
995
996static void nl_fib_lookup_exit(struct net *net)
997{
Denis V. Lunevb7c6ba62008-01-28 14:41:19 -0800998 netlink_kernel_release(net->ipv4.fibnl);
Denis V. Lunev775516b2008-01-18 23:55:19 -0800999 net->ipv4.fibnl = NULL;
Robert Olsson246955f2005-06-20 13:36:39 -07001000}
1001
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001002static void fib_disable_ip(struct net_device *dev, int force)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003{
Denis V. Lunev85326fa2008-01-31 18:48:47 -08001004 if (fib_sync_down_dev(dev, force))
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001005 fib_flush(dev_net(dev));
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001006 rt_cache_flush(dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 arp_ifdown(dev);
1008}
1009
1010static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
1011{
Jianjun Kong6ed25332008-11-03 00:25:16 -08001012 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Denis V. Lunev76e6ebf2008-07-05 19:00:44 -07001013 struct net_device *dev = ifa->ifa_dev->dev;
David S. Miller436c3b62011-03-24 17:42:21 -07001014 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
1016 switch (event) {
1017 case NETDEV_UP:
1018 fib_add_ifaddr(ifa);
1019#ifdef CONFIG_IP_ROUTE_MULTIPATH
Denis V. Lunev76e6ebf2008-07-05 19:00:44 -07001020 fib_sync_up(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021#endif
David S. Miller436c3b62011-03-24 17:42:21 -07001022 atomic_inc(&net->ipv4.dev_addr_genid);
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001023 rt_cache_flush(dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 break;
1025 case NETDEV_DOWN:
Julian Anastasove6abbaa2011-03-19 12:13:49 +00001026 fib_del_ifaddr(ifa, NULL);
David S. Miller436c3b62011-03-24 17:42:21 -07001027 atomic_inc(&net->ipv4.dev_addr_genid);
Jayachandran C9fcc2e82005-10-27 15:10:01 -07001028 if (ifa->ifa_dev->ifa_list == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 /* Last address was deleted from this interface.
Eric Dumazet6a31d2a2010-10-04 20:00:18 +00001030 * Disable IP.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 */
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001032 fib_disable_ip(dev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 } else {
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001034 rt_cache_flush(dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 }
1036 break;
1037 }
1038 return NOTIFY_DONE;
1039}
1040
1041static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1042{
1043 struct net_device *dev = ptr;
Eric Dumazet0115e8e2012-08-22 17:19:46 +00001044 struct in_device *in_dev;
David S. Miller436c3b62011-03-24 17:42:21 -07001045 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
1047 if (event == NETDEV_UNREGISTER) {
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001048 fib_disable_ip(dev, 2);
David S. Millercaacf052012-07-31 15:06:50 -07001049 rt_flush_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 return NOTIFY_DONE;
1051 }
1052
Eric Dumazet0115e8e2012-08-22 17:19:46 +00001053 in_dev = __in_dev_get_rtnl(dev);
1054
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 switch (event) {
1056 case NETDEV_UP:
1057 for_ifa(in_dev) {
1058 fib_add_ifaddr(ifa);
1059 } endfor_ifa(in_dev);
1060#ifdef CONFIG_IP_ROUTE_MULTIPATH
1061 fib_sync_up(dev);
1062#endif
David S. Miller436c3b62011-03-24 17:42:21 -07001063 atomic_inc(&net->ipv4.dev_addr_genid);
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001064 rt_cache_flush(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 break;
1066 case NETDEV_DOWN:
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001067 fib_disable_ip(dev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 break;
1069 case NETDEV_CHANGEMTU:
1070 case NETDEV_CHANGE:
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001071 rt_cache_flush(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 break;
1073 }
1074 return NOTIFY_DONE;
1075}
1076
1077static struct notifier_block fib_inetaddr_notifier = {
Jianjun Kong6ed25332008-11-03 00:25:16 -08001078 .notifier_call = fib_inetaddr_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079};
1080
1081static struct notifier_block fib_netdev_notifier = {
Jianjun Kong6ed25332008-11-03 00:25:16 -08001082 .notifier_call = fib_netdev_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083};
1084
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001085static int __net_init ip_fib_net_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086{
Denis V. Lunevdce5cbe2008-01-31 18:44:53 -08001087 int err;
Eric Dumazet10da66f2010-10-13 08:22:03 +00001088 size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ;
Patrick McHardy1af5a8c2006-08-10 23:10:46 -07001089
Eric Dumazet10da66f2010-10-13 08:22:03 +00001090 /* Avoid false sharing : Use at least a full cache line */
1091 size = max_t(size_t, size, L1_CACHE_BYTES);
1092
1093 net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL);
Denis V. Luneve4aef8a2008-01-10 03:28:24 -08001094 if (net->ipv4.fib_table_hash == NULL)
1095 return -ENOMEM;
1096
Denis V. Lunevdce5cbe2008-01-31 18:44:53 -08001097 err = fib4_rules_init(net);
1098 if (err < 0)
1099 goto fail;
1100 return 0;
1101
1102fail:
1103 kfree(net->ipv4.fib_table_hash);
1104 return err;
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001105}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001107static void ip_fib_net_exit(struct net *net)
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001108{
1109 unsigned int i;
Thomas Graf63f34442007-03-22 11:55:17 -07001110
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001111#ifdef CONFIG_IP_MULTIPLE_TABLES
1112 fib4_rules_exit(net);
1113#endif
1114
Eric Dumazete2666f82011-03-30 16:57:46 -07001115 rtnl_lock();
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001116 for (i = 0; i < FIB_TABLE_HASHSZ; i++) {
1117 struct fib_table *tb;
1118 struct hlist_head *head;
1119 struct hlist_node *node, *tmp;
1120
Denis V. Luneve4aef8a2008-01-10 03:28:24 -08001121 head = &net->ipv4.fib_table_hash[i];
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001122 hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) {
1123 hlist_del(node);
Stephen Hemminger16c6cf82009-09-20 10:35:36 +00001124 fib_table_flush(tb);
Pavel Emelyanov4aa2c462010-10-28 02:00:43 +00001125 fib_free_table(tb);
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001126 }
1127 }
Eric Dumazete2666f82011-03-30 16:57:46 -07001128 rtnl_unlock();
Denis V. Luneve4aef8a2008-01-10 03:28:24 -08001129 kfree(net->ipv4.fib_table_hash);
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001130}
1131
1132static int __net_init fib_net_init(struct net *net)
1133{
1134 int error;
1135
David S. Millerf4530fa2012-07-05 22:13:13 -07001136#ifdef CONFIG_IP_ROUTE_CLASSID
1137 net->ipv4.fib_num_tclassid_users = 0;
1138#endif
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001139 error = ip_fib_net_init(net);
1140 if (error < 0)
1141 goto out;
1142 error = nl_fib_lookup_init(net);
1143 if (error < 0)
1144 goto out_nlfl;
1145 error = fib_proc_init(net);
1146 if (error < 0)
1147 goto out_proc;
1148out:
1149 return error;
1150
1151out_proc:
1152 nl_fib_lookup_exit(net);
1153out_nlfl:
1154 ip_fib_net_exit(net);
1155 goto out;
1156}
1157
1158static void __net_exit fib_net_exit(struct net *net)
1159{
1160 fib_proc_exit(net);
1161 nl_fib_lookup_exit(net);
1162 ip_fib_net_exit(net);
1163}
1164
1165static struct pernet_operations fib_net_ops = {
1166 .init = fib_net_init,
1167 .exit = fib_net_exit,
1168};
1169
1170void __init ip_fib_init(void)
1171{
Greg Rosec7ac8672011-06-10 01:27:09 +00001172 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL);
1173 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL);
1174 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL);
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001175
1176 register_pernet_subsys(&fib_net_ops);
1177 register_netdevice_notifier(&fib_netdev_notifier);
1178 register_inetaddr_notifier(&fib_inetaddr_notifier);
Stephen Hemminger7f9b8052008-01-14 23:14:20 -08001179
David S. Miller5348ba82011-02-01 15:30:56 -08001180 fib_trie_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181}