blob: c7539e22868b37d59018730aca786176df5408ee [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;
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800115 struct hlist_head *head;
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700116 unsigned int h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700118 if (id == 0)
119 id = RT_TABLE_MAIN;
120 h = id & (FIB_TABLE_HASHSZ - 1);
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800121
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700122 rcu_read_lock();
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800123 head = &net->ipv4.fib_table_hash[h];
Sasha Levinb67bfe02013-02-27 17:06:00 -0800124 hlist_for_each_entry_rcu(tb, head, tb_hlist) {
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700125 if (tb->tb_id == id) {
126 rcu_read_unlock();
127 return tb;
128 }
129 }
130 rcu_read_unlock();
131 return NULL;
132}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133#endif /* CONFIG_IP_MULTIPLE_TABLES */
134
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800135static void fib_flush(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136{
137 int flushed = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 struct fib_table *tb;
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800139 struct hlist_head *head;
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700140 unsigned int h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700142 for (h = 0; h < FIB_TABLE_HASHSZ; h++) {
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800143 head = &net->ipv4.fib_table_hash[h];
Sasha Levinb67bfe02013-02-27 17:06:00 -0800144 hlist_for_each_entry(tb, head, tb_hlist)
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000145 flushed += fib_table_flush(tb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 if (flushed)
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +0000149 rt_cache_flush(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800152/*
153 * Find address type as if only "dev" was present in the system. If
154 * on_dev is NULL then all interfaces are taken into consideration.
155 */
Eric Dumazet95c96172012-04-15 05:58:06 +0000156static inline unsigned int __inet_dev_addr_type(struct net *net,
157 const struct net_device *dev,
158 __be32 addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
David S. Miller9ade2282011-03-12 02:02:42 -0500160 struct flowi4 fl4 = { .daddr = addr };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 struct fib_result res;
Eric Dumazet95c96172012-04-15 05:58:06 +0000162 unsigned int ret = RTN_BROADCAST;
Pavel Emelyanov03cf7862007-10-23 21:17:27 -0700163 struct fib_table *local_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Jan Engelhardt1e637c72008-01-21 03:18:08 -0800165 if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 return RTN_BROADCAST;
Joe Perchesf97c1e02007-12-16 13:45:43 -0800167 if (ipv4_is_multicast(addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 return RTN_MULTICAST;
169
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800170 local_table = fib_get_table(net, RT_TABLE_LOCAL);
Pavel Emelyanov03cf7862007-10-23 21:17:27 -0700171 if (local_table) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 ret = RTN_UNICAST;
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000173 rcu_read_lock();
David S. Miller9ade2282011-03-12 02:02:42 -0500174 if (!fib_table_lookup(local_table, &fl4, &res, FIB_LOOKUP_NOREF)) {
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800175 if (!dev || dev == res.fi->fib_dev)
176 ret = res.type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 }
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000178 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
180 return ret;
181}
182
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800183unsigned int inet_addr_type(struct net *net, __be32 addr)
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800184{
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800185 return __inet_dev_addr_type(net, NULL, addr);
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800186}
Eric Dumazet4bc2f182010-07-09 21:22:10 +0000187EXPORT_SYMBOL(inet_addr_type);
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800188
Eric W. Biederman6b175b22008-01-10 03:25:28 -0800189unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
190 __be32 addr)
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800191{
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000192 return __inet_dev_addr_type(net, dev, addr);
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800193}
Eric Dumazet4bc2f182010-07-09 21:22:10 +0000194EXPORT_SYMBOL(inet_dev_addr_type);
Laszlo Attila Toth05538112007-12-04 23:28:46 -0800195
David S. Miller35ebf652012-06-28 03:59:11 -0700196__be32 fib_compute_spec_dst(struct sk_buff *skb)
197{
198 struct net_device *dev = skb->dev;
199 struct in_device *in_dev;
200 struct fib_result res;
David S. Millera207a4b2012-06-28 18:33:24 -0700201 struct rtable *rt;
David S. Miller35ebf652012-06-28 03:59:11 -0700202 struct flowi4 fl4;
203 struct net *net;
David S. Millera207a4b2012-06-28 18:33:24 -0700204 int scope;
David S. Miller35ebf652012-06-28 03:59:11 -0700205
David S. Millera207a4b2012-06-28 18:33:24 -0700206 rt = skb_rtable(skb);
Julian Anastasov0cc535a2012-07-18 21:35:03 +0000207 if ((rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST | RTCF_LOCAL)) ==
208 RTCF_LOCAL)
David S. Miller35ebf652012-06-28 03:59:11 -0700209 return ip_hdr(skb)->daddr;
210
211 in_dev = __in_dev_get_rcu(dev);
212 BUG_ON(!in_dev);
David S. Miller35ebf652012-06-28 03:59:11 -0700213
214 net = dev_net(dev);
David S. Millera207a4b2012-06-28 18:33:24 -0700215
216 scope = RT_SCOPE_UNIVERSE;
217 if (!ipv4_is_zeronet(ip_hdr(skb)->saddr)) {
218 fl4.flowi4_oif = 0;
Pavel Emelyanov1fb94892012-08-08 21:53:36 +0000219 fl4.flowi4_iif = LOOPBACK_IFINDEX;
David S. Millera207a4b2012-06-28 18:33:24 -0700220 fl4.daddr = ip_hdr(skb)->saddr;
221 fl4.saddr = 0;
222 fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
223 fl4.flowi4_scope = scope;
224 fl4.flowi4_mark = IN_DEV_SRC_VMARK(in_dev) ? skb->mark : 0;
225 if (!fib_lookup(net, &fl4, &res))
226 return FIB_RES_PREFSRC(net, res);
227 } else {
228 scope = RT_SCOPE_LINK;
229 }
230
231 return inet_select_addr(dev, ip_hdr(skb)->saddr, scope);
David S. Miller35ebf652012-06-28 03:59:11 -0700232}
233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234/* Given (packet source, input interface) and optional (dst, oif, tos):
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000235 * - (main) check, that source is valid i.e. not broadcast or our local
236 * address.
237 * - figure out what "logical" interface this packet arrived
238 * and calculate "specific destination" address.
239 * - check, that packet arrived from expected physical interface.
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000240 * called with rcu_read_lock()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 */
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700242static int __fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
243 u8 tos, int oif, struct net_device *dev,
244 int rpf, struct in_device *idev, u32 *itag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245{
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700246 int ret, no_addr, accept_local;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 struct fib_result res;
David S. Miller9e56e382012-06-28 18:54:02 -0700248 struct flowi4 fl4;
Denis V. Lunev5b707aa2008-01-21 17:33:15 -0800249 struct net *net;
David S. Miller9e56e382012-06-28 18:54:02 -0700250 bool dev_match;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
David S. Miller9ade2282011-03-12 02:02:42 -0500252 fl4.flowi4_oif = 0;
253 fl4.flowi4_iif = oif;
David S. Miller9ade2282011-03-12 02:02:42 -0500254 fl4.daddr = src;
255 fl4.saddr = dst;
256 fl4.flowi4_tos = tos;
257 fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
David S. Millercc7e17e2011-03-09 20:57:50 -0800258
David S. Miller9e56e382012-06-28 18:54:02 -0700259 no_addr = idev->ifa_list == NULL;
Michael Smith990078a2011-04-07 04:51:51 +0000260
David S. Miller9e56e382012-06-28 18:54:02 -0700261 accept_local = IN_DEV_ACCEPT_LOCAL(idev);
262 fl4.flowi4_mark = IN_DEV_SRC_VMARK(idev) ? skb->mark : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900264 net = dev_net(dev);
David S. Miller9ade2282011-03-12 02:02:42 -0500265 if (fib_lookup(net, &fl4, &res))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 goto last_resort;
Patrick McHardy8153a102009-12-03 01:25:58 +0000267 if (res.type != RTN_UNICAST) {
268 if (res.type != RTN_LOCAL || !accept_local)
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000269 goto e_inval;
Patrick McHardy8153a102009-12-03 01:25:58 +0000270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 fib_combine_itag(itag, &res);
David S. Miller6f86b322010-09-06 22:36:19 -0700272 dev_match = false;
273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274#ifdef CONFIG_IP_ROUTE_MULTIPATH
David S. Miller6f86b322010-09-06 22:36:19 -0700275 for (ret = 0; ret < res.fi->fib_nhs; ret++) {
276 struct fib_nh *nh = &res.fi->fib_nh[ret];
277
278 if (nh->nh_dev == dev) {
279 dev_match = true;
280 break;
281 }
282 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283#else
284 if (FIB_RES_DEV(res) == dev)
David S. Miller6f86b322010-09-06 22:36:19 -0700285 dev_match = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286#endif
David S. Miller6f86b322010-09-06 22:36:19 -0700287 if (dev_match) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 return ret;
290 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 if (no_addr)
292 goto last_resort;
Stephen Hemmingerc1cf8422009-02-20 08:25:36 +0000293 if (rpf == 1)
Eric Dumazetb5f7e752010-06-02 12:05:27 +0000294 goto e_rpf;
David S. Miller9ade2282011-03-12 02:02:42 -0500295 fl4.flowi4_oif = dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 ret = 0;
David S. Miller9ade2282011-03-12 02:02:42 -0500298 if (fib_lookup(net, &fl4, &res) == 0) {
David S. Miller41347dc2012-06-28 04:05:27 -0700299 if (res.type == RTN_UNICAST)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 }
302 return ret;
303
304last_resort:
305 if (rpf)
Eric Dumazetb5f7e752010-06-02 12:05:27 +0000306 goto e_rpf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 *itag = 0;
308 return 0;
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310e_inval:
311 return -EINVAL;
Eric Dumazetb5f7e752010-06-02 12:05:27 +0000312e_rpf:
313 return -EXDEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314}
315
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700316/* Ignore rp_filter for packets protected by IPsec. */
317int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
318 u8 tos, int oif, struct net_device *dev,
319 struct in_device *idev, u32 *itag)
320{
321 int r = secpath_exists(skb) ? 0 : IN_DEV_RPFILTER(idev);
322
Julian Anastasove81da0e2012-10-08 11:41:15 +0000323 if (!r && !fib_num_tclassid_users(dev_net(dev)) &&
324 (dev->ifindex != oif || !IN_DEV_TX_REDIRECTS(idev))) {
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700325 *itag = 0;
326 return 0;
327 }
328 return __fib_validate_source(skb, src, dst, tos, oif, dev, r, idev, itag);
329}
330
Al Viro81f7bf62006-09-27 18:40:00 -0700331static inline __be32 sk_extract_addr(struct sockaddr *addr)
Thomas Graf4e902c52006-08-17 18:14:52 -0700332{
333 return ((struct sockaddr_in *) addr)->sin_addr.s_addr;
334}
335
336static int put_rtax(struct nlattr *mx, int len, int type, u32 value)
337{
338 struct nlattr *nla;
339
340 nla = (struct nlattr *) ((char *) mx + len);
341 nla->nla_type = type;
342 nla->nla_len = nla_attr_size(4);
343 *(u32 *) nla_data(nla) = value;
344
345 return len + nla_total_size(4);
346}
347
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800348static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt,
Thomas Graf4e902c52006-08-17 18:14:52 -0700349 struct fib_config *cfg)
350{
Al Viro6d85c102006-09-26 22:15:46 -0700351 __be32 addr;
Thomas Graf4e902c52006-08-17 18:14:52 -0700352 int plen;
353
354 memset(cfg, 0, sizeof(*cfg));
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800355 cfg->fc_nlinfo.nl_net = net;
Thomas Graf4e902c52006-08-17 18:14:52 -0700356
357 if (rt->rt_dst.sa_family != AF_INET)
358 return -EAFNOSUPPORT;
359
360 /*
361 * Check mask for validity:
362 * a) it must be contiguous.
363 * b) destination must have all host bits clear.
364 * c) if application forgot to set correct family (AF_INET),
365 * reject request unless it is absolutely clear i.e.
366 * both family and mask are zero.
367 */
368 plen = 32;
369 addr = sk_extract_addr(&rt->rt_dst);
370 if (!(rt->rt_flags & RTF_HOST)) {
Al Viro81f7bf62006-09-27 18:40:00 -0700371 __be32 mask = sk_extract_addr(&rt->rt_genmask);
Thomas Graf4e902c52006-08-17 18:14:52 -0700372
373 if (rt->rt_genmask.sa_family != AF_INET) {
374 if (mask || rt->rt_genmask.sa_family)
375 return -EAFNOSUPPORT;
376 }
377
378 if (bad_mask(mask, addr))
379 return -EINVAL;
380
381 plen = inet_mask_len(mask);
382 }
383
384 cfg->fc_dst_len = plen;
385 cfg->fc_dst = addr;
386
387 if (cmd != SIOCDELRT) {
388 cfg->fc_nlflags = NLM_F_CREATE;
389 cfg->fc_protocol = RTPROT_BOOT;
390 }
391
392 if (rt->rt_metric)
393 cfg->fc_priority = rt->rt_metric - 1;
394
395 if (rt->rt_flags & RTF_REJECT) {
396 cfg->fc_scope = RT_SCOPE_HOST;
397 cfg->fc_type = RTN_UNREACHABLE;
398 return 0;
399 }
400
401 cfg->fc_scope = RT_SCOPE_NOWHERE;
402 cfg->fc_type = RTN_UNICAST;
403
404 if (rt->rt_dev) {
405 char *colon;
406 struct net_device *dev;
407 char devname[IFNAMSIZ];
408
409 if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1))
410 return -EFAULT;
411
412 devname[IFNAMSIZ-1] = 0;
413 colon = strchr(devname, ':');
414 if (colon)
415 *colon = 0;
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800416 dev = __dev_get_by_name(net, devname);
Thomas Graf4e902c52006-08-17 18:14:52 -0700417 if (!dev)
418 return -ENODEV;
419 cfg->fc_oif = dev->ifindex;
420 if (colon) {
421 struct in_ifaddr *ifa;
422 struct in_device *in_dev = __in_dev_get_rtnl(dev);
423 if (!in_dev)
424 return -ENODEV;
425 *colon = ':';
426 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next)
427 if (strcmp(ifa->ifa_label, devname) == 0)
428 break;
429 if (ifa == NULL)
430 return -ENODEV;
431 cfg->fc_prefsrc = ifa->ifa_local;
432 }
433 }
434
435 addr = sk_extract_addr(&rt->rt_gateway);
436 if (rt->rt_gateway.sa_family == AF_INET && addr) {
437 cfg->fc_gw = addr;
438 if (rt->rt_flags & RTF_GATEWAY &&
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800439 inet_addr_type(net, addr) == RTN_UNICAST)
Thomas Graf4e902c52006-08-17 18:14:52 -0700440 cfg->fc_scope = RT_SCOPE_UNIVERSE;
441 }
442
443 if (cmd == SIOCDELRT)
444 return 0;
445
446 if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw)
447 return -EINVAL;
448
449 if (cfg->fc_scope == RT_SCOPE_NOWHERE)
450 cfg->fc_scope = RT_SCOPE_LINK;
451
452 if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) {
453 struct nlattr *mx;
454 int len = 0;
455
456 mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900457 if (mx == NULL)
Thomas Graf4e902c52006-08-17 18:14:52 -0700458 return -ENOMEM;
459
460 if (rt->rt_flags & RTF_MTU)
461 len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40);
462
463 if (rt->rt_flags & RTF_WINDOW)
464 len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window);
465
466 if (rt->rt_flags & RTF_IRTT)
467 len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3);
468
469 cfg->fc_mx = mx;
470 cfg->fc_mx_len = len;
471 }
472
473 return 0;
474}
475
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476/*
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000477 * Handle IP routing ioctl calls.
478 * These are used to manipulate the routing tables
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 */
Denis V. Lunev1bad1182008-01-10 03:29:53 -0800480int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481{
Thomas Graf4e902c52006-08-17 18:14:52 -0700482 struct fib_config cfg;
483 struct rtentry rt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 switch (cmd) {
487 case SIOCADDRT: /* Add a route */
488 case SIOCDELRT: /* Delete a route */
Eric W. Biederman52e804c2012-11-16 03:03:05 +0000489 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 return -EPERM;
Thomas Graf4e902c52006-08-17 18:14:52 -0700491
492 if (copy_from_user(&rt, arg, sizeof(rt)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 return -EFAULT;
Thomas Graf4e902c52006-08-17 18:14:52 -0700494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 rtnl_lock();
Denis V. Lunev1bad1182008-01-10 03:29:53 -0800496 err = rtentry_to_fib_config(net, cmd, &rt, &cfg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 if (err == 0) {
Thomas Graf4e902c52006-08-17 18:14:52 -0700498 struct fib_table *tb;
499
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 if (cmd == SIOCDELRT) {
Denis V. Lunev1bad1182008-01-10 03:29:53 -0800501 tb = fib_get_table(net, cfg.fc_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 if (tb)
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000503 err = fib_table_delete(tb, &cfg);
Thomas Graf4e902c52006-08-17 18:14:52 -0700504 else
505 err = -ESRCH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 } else {
Denis V. Lunev1bad1182008-01-10 03:29:53 -0800507 tb = fib_new_table(net, cfg.fc_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 if (tb)
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000509 err = fib_table_insert(tb, &cfg);
Thomas Graf4e902c52006-08-17 18:14:52 -0700510 else
511 err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 }
Thomas Graf4e902c52006-08-17 18:14:52 -0700513
514 /* allocated by rtentry_to_fib_config() */
515 kfree(cfg.fc_mx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 }
517 rtnl_unlock();
518 return err;
519 }
520 return -EINVAL;
521}
522
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000523const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
Thomas Graf4e902c52006-08-17 18:14:52 -0700524 [RTA_DST] = { .type = NLA_U32 },
525 [RTA_SRC] = { .type = NLA_U32 },
526 [RTA_IIF] = { .type = NLA_U32 },
527 [RTA_OIF] = { .type = NLA_U32 },
528 [RTA_GATEWAY] = { .type = NLA_U32 },
529 [RTA_PRIORITY] = { .type = NLA_U32 },
530 [RTA_PREFSRC] = { .type = NLA_U32 },
531 [RTA_METRICS] = { .type = NLA_NESTED },
Thomas Graf5176f912006-08-26 20:13:18 -0700532 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
Thomas Graf4e902c52006-08-17 18:14:52 -0700533 [RTA_FLOW] = { .type = NLA_U32 },
Thomas Graf4e902c52006-08-17 18:14:52 -0700534};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800536static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000537 struct nlmsghdr *nlh, struct fib_config *cfg)
Thomas Graf4e902c52006-08-17 18:14:52 -0700538{
539 struct nlattr *attr;
540 int err, remaining;
541 struct rtmsg *rtm;
542
543 err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy);
544 if (err < 0)
545 goto errout;
546
547 memset(cfg, 0, sizeof(*cfg));
548
549 rtm = nlmsg_data(nlh);
Thomas Graf4e902c52006-08-17 18:14:52 -0700550 cfg->fc_dst_len = rtm->rtm_dst_len;
Thomas Graf4e902c52006-08-17 18:14:52 -0700551 cfg->fc_tos = rtm->rtm_tos;
552 cfg->fc_table = rtm->rtm_table;
553 cfg->fc_protocol = rtm->rtm_protocol;
554 cfg->fc_scope = rtm->rtm_scope;
555 cfg->fc_type = rtm->rtm_type;
556 cfg->fc_flags = rtm->rtm_flags;
557 cfg->fc_nlflags = nlh->nlmsg_flags;
558
Eric W. Biederman15e47302012-09-07 20:12:54 +0000559 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
Thomas Graf4e902c52006-08-17 18:14:52 -0700560 cfg->fc_nlinfo.nlh = nlh;
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800561 cfg->fc_nlinfo.nl_net = net;
Thomas Graf4e902c52006-08-17 18:14:52 -0700562
Thomas Grafa0ee18b2007-03-24 20:32:54 -0700563 if (cfg->fc_type > RTN_MAX) {
564 err = -EINVAL;
565 goto errout;
566 }
567
Thomas Graf4e902c52006-08-17 18:14:52 -0700568 nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) {
Thomas Graf8f4c1f92007-09-12 14:44:36 +0200569 switch (nla_type(attr)) {
Thomas Graf4e902c52006-08-17 18:14:52 -0700570 case RTA_DST:
Al Viro17fb2c62006-09-26 22:15:25 -0700571 cfg->fc_dst = nla_get_be32(attr);
Thomas Graf4e902c52006-08-17 18:14:52 -0700572 break;
Thomas Graf4e902c52006-08-17 18:14:52 -0700573 case RTA_OIF:
574 cfg->fc_oif = nla_get_u32(attr);
575 break;
576 case RTA_GATEWAY:
Al Viro17fb2c62006-09-26 22:15:25 -0700577 cfg->fc_gw = nla_get_be32(attr);
Thomas Graf4e902c52006-08-17 18:14:52 -0700578 break;
579 case RTA_PRIORITY:
580 cfg->fc_priority = nla_get_u32(attr);
581 break;
582 case RTA_PREFSRC:
Al Viro17fb2c62006-09-26 22:15:25 -0700583 cfg->fc_prefsrc = nla_get_be32(attr);
Thomas Graf4e902c52006-08-17 18:14:52 -0700584 break;
585 case RTA_METRICS:
586 cfg->fc_mx = nla_data(attr);
587 cfg->fc_mx_len = nla_len(attr);
588 break;
589 case RTA_MULTIPATH:
590 cfg->fc_mp = nla_data(attr);
591 cfg->fc_mp_len = nla_len(attr);
592 break;
593 case RTA_FLOW:
594 cfg->fc_flow = nla_get_u32(attr);
595 break;
Thomas Graf4e902c52006-08-17 18:14:52 -0700596 case RTA_TABLE:
597 cfg->fc_table = nla_get_u32(attr);
598 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 }
600 }
Thomas Graf4e902c52006-08-17 18:14:52 -0700601
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 return 0;
Thomas Graf4e902c52006-08-17 18:14:52 -0700603errout:
604 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605}
606
Thomas Graf661d2962013-03-21 07:45:29 +0000607static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900609 struct net *net = sock_net(skb->sk);
Thomas Graf4e902c52006-08-17 18:14:52 -0700610 struct fib_config cfg;
611 struct fib_table *tb;
612 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800614 err = rtm_to_fib_config(net, skb, nlh, &cfg);
Thomas Graf4e902c52006-08-17 18:14:52 -0700615 if (err < 0)
616 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800618 tb = fib_get_table(net, cfg.fc_table);
Thomas Graf4e902c52006-08-17 18:14:52 -0700619 if (tb == NULL) {
620 err = -ESRCH;
621 goto errout;
622 }
623
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000624 err = fib_table_delete(tb, &cfg);
Thomas Graf4e902c52006-08-17 18:14:52 -0700625errout:
626 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627}
628
Thomas Graf661d2962013-03-21 07:45:29 +0000629static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900631 struct net *net = sock_net(skb->sk);
Thomas Graf4e902c52006-08-17 18:14:52 -0700632 struct fib_config cfg;
633 struct fib_table *tb;
634 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800636 err = rtm_to_fib_config(net, skb, nlh, &cfg);
Thomas Graf4e902c52006-08-17 18:14:52 -0700637 if (err < 0)
638 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
Denis V. Lunev226b0b4a52008-01-10 03:30:24 -0800640 tb = fib_new_table(net, cfg.fc_table);
Thomas Graf4e902c52006-08-17 18:14:52 -0700641 if (tb == NULL) {
642 err = -ENOBUFS;
643 goto errout;
644 }
645
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000646 err = fib_table_insert(tb, &cfg);
Thomas Graf4e902c52006-08-17 18:14:52 -0700647errout:
648 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649}
650
Thomas Graf63f34442007-03-22 11:55:17 -0700651static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900653 struct net *net = sock_net(skb->sk);
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700654 unsigned int h, s_h;
655 unsigned int e = 0, s_e;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 struct fib_table *tb;
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800657 struct hlist_head *head;
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700658 int dumped = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Thomas Grafbe403ea2006-08-17 18:15:17 -0700660 if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) &&
661 ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 return ip_rt_dump(skb, cb);
663
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700664 s_h = cb->args[0];
665 s_e = cb->args[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700667 for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) {
668 e = 0;
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800669 head = &net->ipv4.fib_table_hash[h];
Sasha Levinb67bfe02013-02-27 17:06:00 -0800670 hlist_for_each_entry(tb, head, tb_hlist) {
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700671 if (e < s_e)
672 goto next;
673 if (dumped)
674 memset(&cb->args[2], 0, sizeof(cb->args) -
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900675 2 * sizeof(cb->args[0]));
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000676 if (fib_table_dump(tb, skb, cb) < 0)
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700677 goto out;
678 dumped = 1;
679next:
680 e++;
681 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 }
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700683out:
684 cb->args[1] = e;
685 cb->args[0] = h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686
687 return skb->len;
688}
689
690/* Prepare and feed intra-kernel routing request.
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000691 * Really, it should be netlink message, but :-( netlink
692 * can be not configured, so that we feed it directly
693 * to fib engine. It is legal, because all events occur
694 * only when netlink is already locked.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 */
Al Viro81f7bf62006-09-27 18:40:00 -0700696static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697{
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900698 struct net *net = dev_net(ifa->ifa_dev->dev);
Thomas Graf4e902c52006-08-17 18:14:52 -0700699 struct fib_table *tb;
700 struct fib_config cfg = {
701 .fc_protocol = RTPROT_KERNEL,
702 .fc_type = type,
703 .fc_dst = dst,
704 .fc_dst_len = dst_len,
705 .fc_prefsrc = ifa->ifa_local,
706 .fc_oif = ifa->ifa_dev->dev->ifindex,
707 .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND,
Denis V. Lunev4d1169c2008-01-10 03:26:13 -0800708 .fc_nlinfo = {
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800709 .nl_net = net,
Denis V. Lunev4d1169c2008-01-10 03:26:13 -0800710 },
Thomas Graf4e902c52006-08-17 18:14:52 -0700711 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
713 if (type == RTN_UNICAST)
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800714 tb = fib_new_table(net, RT_TABLE_MAIN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 else
Denis V. Lunev4b5d47d2008-01-10 03:29:23 -0800716 tb = fib_new_table(net, RT_TABLE_LOCAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
718 if (tb == NULL)
719 return;
720
Thomas Graf4e902c52006-08-17 18:14:52 -0700721 cfg.fc_table = tb->tb_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
Thomas Graf4e902c52006-08-17 18:14:52 -0700723 if (type != RTN_LOCAL)
724 cfg.fc_scope = RT_SCOPE_LINK;
725 else
726 cfg.fc_scope = RT_SCOPE_HOST;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
728 if (cmd == RTM_NEWROUTE)
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000729 fib_table_insert(tb, &cfg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 else
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000731 fib_table_delete(tb, &cfg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732}
733
Jamal Hadi Salim0ff60a42005-11-22 14:47:37 -0800734void fib_add_ifaddr(struct in_ifaddr *ifa)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735{
736 struct in_device *in_dev = ifa->ifa_dev;
737 struct net_device *dev = in_dev->dev;
738 struct in_ifaddr *prim = ifa;
Al Viroa144ea42006-09-28 18:00:55 -0700739 __be32 mask = ifa->ifa_mask;
740 __be32 addr = ifa->ifa_local;
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000741 __be32 prefix = ifa->ifa_address & mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000743 if (ifa->ifa_flags & IFA_F_SECONDARY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 prim = inet_ifa_byprefix(in_dev, prefix, mask);
745 if (prim == NULL) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000746 pr_warn("%s: bug: prim == NULL\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 return;
748 }
749 }
750
751 fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim);
752
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000753 if (!(dev->flags & IFF_UP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 return;
755
756 /* Add broadcast address, if it is explicitly assigned. */
Al Viroa144ea42006-09-28 18:00:55 -0700757 if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
759
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000760 if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags & IFA_F_SECONDARY) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 (prefix != addr || ifa->ifa_prefixlen < 32)) {
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000762 fib_magic(RTM_NEWROUTE,
763 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
764 prefix, ifa->ifa_prefixlen, prim);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
766 /* Add network specific broadcasts, when it takes a sense */
767 if (ifa->ifa_prefixlen < 31) {
768 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim);
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000769 fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix | ~mask,
770 32, prim);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 }
772 }
773}
774
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000775/* Delete primary or secondary address.
776 * Optionally, on secondary address promotion consider the addresses
777 * from subnet iprim as deleted, even if they are in device list.
778 * In this case the secondary ifa can be in device list.
779 */
780void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781{
782 struct in_device *in_dev = ifa->ifa_dev;
783 struct net_device *dev = in_dev->dev;
784 struct in_ifaddr *ifa1;
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000785 struct in_ifaddr *prim = ifa, *prim1 = NULL;
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000786 __be32 brd = ifa->ifa_address | ~ifa->ifa_mask;
787 __be32 any = ifa->ifa_address & ifa->ifa_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788#define LOCAL_OK 1
789#define BRD_OK 2
790#define BRD0_OK 4
791#define BRD1_OK 8
Eric Dumazet95c96172012-04-15 05:58:06 +0000792 unsigned int ok = 0;
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000793 int subnet = 0; /* Primary network */
794 int gone = 1; /* Address is missing */
795 int same_prefsrc = 0; /* Another primary with same IP */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000797 if (ifa->ifa_flags & IFA_F_SECONDARY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask);
799 if (prim == NULL) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000800 pr_warn("%s: bug: prim == NULL\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 return;
802 }
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000803 if (iprim && iprim != prim) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000804 pr_warn("%s: bug: iprim != prim\n", __func__);
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000805 return;
806 }
807 } else if (!ipv4_is_zeronet(any) &&
808 (any != ifa->ifa_local || ifa->ifa_prefixlen < 32)) {
809 fib_magic(RTM_DELROUTE,
810 dev->flags & IFF_LOOPBACK ? RTN_LOCAL : RTN_UNICAST,
811 any, ifa->ifa_prefixlen, prim);
812 subnet = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 }
814
815 /* Deletion is more complicated than add.
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000816 * We should take care of not to delete too much :-)
817 *
818 * Scan address list to be sure that addresses are really gone.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 */
820
821 for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000822 if (ifa1 == ifa) {
823 /* promotion, keep the IP */
824 gone = 0;
825 continue;
826 }
827 /* Ignore IFAs from our subnet */
828 if (iprim && ifa1->ifa_mask == iprim->ifa_mask &&
829 inet_ifa_match(ifa1->ifa_address, iprim))
830 continue;
831
832 /* Ignore ifa1 if it uses different primary IP (prefsrc) */
833 if (ifa1->ifa_flags & IFA_F_SECONDARY) {
834 /* Another address from our subnet? */
835 if (ifa1->ifa_mask == prim->ifa_mask &&
836 inet_ifa_match(ifa1->ifa_address, prim))
837 prim1 = prim;
838 else {
839 /* We reached the secondaries, so
840 * same_prefsrc should be determined.
841 */
842 if (!same_prefsrc)
843 continue;
844 /* Search new prim1 if ifa1 is not
845 * using the current prim1
846 */
847 if (!prim1 ||
848 ifa1->ifa_mask != prim1->ifa_mask ||
849 !inet_ifa_match(ifa1->ifa_address, prim1))
850 prim1 = inet_ifa_byprefix(in_dev,
851 ifa1->ifa_address,
852 ifa1->ifa_mask);
853 if (!prim1)
854 continue;
855 if (prim1->ifa_local != prim->ifa_local)
856 continue;
857 }
858 } else {
859 if (prim->ifa_local != ifa1->ifa_local)
860 continue;
861 prim1 = ifa1;
862 if (prim != prim1)
863 same_prefsrc = 1;
864 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 if (ifa->ifa_local == ifa1->ifa_local)
866 ok |= LOCAL_OK;
867 if (ifa->ifa_broadcast == ifa1->ifa_broadcast)
868 ok |= BRD_OK;
869 if (brd == ifa1->ifa_broadcast)
870 ok |= BRD1_OK;
871 if (any == ifa1->ifa_broadcast)
872 ok |= BRD0_OK;
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000873 /* primary has network specific broadcasts */
874 if (prim1 == ifa1 && ifa1->ifa_prefixlen < 31) {
875 __be32 brd1 = ifa1->ifa_address | ~ifa1->ifa_mask;
876 __be32 any1 = ifa1->ifa_address & ifa1->ifa_mask;
877
878 if (!ipv4_is_zeronet(any1)) {
879 if (ifa->ifa_broadcast == brd1 ||
880 ifa->ifa_broadcast == any1)
881 ok |= BRD_OK;
882 if (brd == brd1 || brd == any1)
883 ok |= BRD1_OK;
884 if (any == brd1 || any == any1)
885 ok |= BRD0_OK;
886 }
887 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 }
889
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000890 if (!(ok & BRD_OK))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000892 if (subnet && ifa->ifa_prefixlen < 31) {
893 if (!(ok & BRD1_OK))
894 fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim);
895 if (!(ok & BRD0_OK))
896 fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim);
897 }
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000898 if (!(ok & LOCAL_OK)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim);
900
901 /* Check, that this local address finally disappeared. */
Julian Anastasove6abbaa2011-03-19 12:13:49 +0000902 if (gone &&
903 inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 /* And the last, but not the least thing.
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000905 * We must flush stray FIB entries.
906 *
907 * First of all, we scan fib_info list searching
908 * for stray nexthop entries, then ignite fib_flush.
909 */
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900910 if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local))
911 fib_flush(dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 }
913 }
914#undef LOCAL_OK
915#undef BRD_OK
916#undef BRD0_OK
917#undef BRD1_OK
918}
919
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000920static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb)
Robert Olsson246955f2005-06-20 13:36:39 -0700921{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900922
Robert Olsson246955f2005-06-20 13:36:39 -0700923 struct fib_result res;
David S. Miller9ade2282011-03-12 02:02:42 -0500924 struct flowi4 fl4 = {
925 .flowi4_mark = frn->fl_mark,
926 .daddr = frn->fl_addr,
927 .flowi4_tos = frn->fl_tos,
928 .flowi4_scope = frn->fl_scope,
Eric Dumazet6a31d2a2010-10-04 20:00:18 +0000929 };
Alexey Kuznetsov1194ed02007-04-25 13:07:28 -0700930
931 frn->err = -ENOENT;
Robert Olsson246955f2005-06-20 13:36:39 -0700932 if (tb) {
933 local_bh_disable();
934
935 frn->tb_id = tb->tb_id;
David S. Miller9ade2282011-03-12 02:02:42 -0500936 frn->err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
Robert Olsson246955f2005-06-20 13:36:39 -0700937
938 if (!frn->err) {
939 frn->prefixlen = res.prefixlen;
940 frn->nh_sel = res.nh_sel;
941 frn->type = res.type;
942 frn->scope = res.scope;
943 }
944 local_bh_enable();
945 }
946}
947
David S. Miller28f7b0362007-10-10 21:32:39 -0700948static void nl_fib_input(struct sk_buff *skb)
Robert Olsson246955f2005-06-20 13:36:39 -0700949{
Denis V. Lunev6bd48fc2008-01-10 03:28:55 -0800950 struct net *net;
Robert Olsson246955f2005-06-20 13:36:39 -0700951 struct fib_result_nl *frn;
David S. Miller28f7b0362007-10-10 21:32:39 -0700952 struct nlmsghdr *nlh;
Robert Olsson246955f2005-06-20 13:36:39 -0700953 struct fib_table *tb;
Eric W. Biederman15e47302012-09-07 20:12:54 +0000954 u32 portid;
Alexey Kuznetsov1194ed02007-04-25 13:07:28 -0700955
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900956 net = sock_net(skb->sk);
Arnaldo Carvalho de Melob529ccf2007-04-25 19:08:35 -0700957 nlh = nlmsg_hdr(skb);
Hong zhi guo573ce262013-03-27 06:47:04 +0000958 if (skb->len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len ||
959 nlmsg_len(nlh) < sizeof(*frn))
Thomas Grafea865752005-12-01 14:30:00 -0800960 return;
Denis V. Lunevd883a032007-12-21 02:01:53 -0800961
Pablo Neira3a365152013-06-28 03:04:23 +0200962 skb = netlink_skb_clone(skb, GFP_KERNEL);
Denis V. Lunevd883a032007-12-21 02:01:53 -0800963 if (skb == NULL)
964 return;
965 nlh = nlmsg_hdr(skb);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900966
Hong zhi guo573ce262013-03-27 06:47:04 +0000967 frn = (struct fib_result_nl *) nlmsg_data(nlh);
Denis V. Lunev6bd48fc2008-01-10 03:28:55 -0800968 tb = fib_get_table(net, frn->tb_id_in);
Robert Olsson246955f2005-06-20 13:36:39 -0700969
970 nl_fib_lookup(frn, tb);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900971
Rami Rosen28a28282013-01-11 09:59:20 +0000972 portid = NETLINK_CB(skb).portid; /* netlink portid */
Eric W. Biederman15e47302012-09-07 20:12:54 +0000973 NETLINK_CB(skb).portid = 0; /* from kernel */
Patrick McHardyac6d4392005-08-14 19:29:52 -0700974 NETLINK_CB(skb).dst_group = 0; /* unicast */
Eric W. Biederman15e47302012-09-07 20:12:54 +0000975 netlink_unicast(net->ipv4.fibnl, skb, portid, MSG_DONTWAIT);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900976}
Robert Olsson246955f2005-06-20 13:36:39 -0700977
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000978static int __net_init nl_fib_lookup_init(struct net *net)
Robert Olsson246955f2005-06-20 13:36:39 -0700979{
Denis V. Lunev6bd48fc2008-01-10 03:28:55 -0800980 struct sock *sk;
Pablo Neira Ayusoa31f2d12012-06-29 06:15:21 +0000981 struct netlink_kernel_cfg cfg = {
982 .input = nl_fib_input,
983 };
984
Pablo Neira Ayuso9f00d972012-09-08 02:53:54 +0000985 sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, &cfg);
Denis V. Lunev6bd48fc2008-01-10 03:28:55 -0800986 if (sk == NULL)
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -0800987 return -EAFNOSUPPORT;
Denis V. Lunev6bd48fc2008-01-10 03:28:55 -0800988 net->ipv4.fibnl = sk;
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -0800989 return 0;
990}
991
992static void nl_fib_lookup_exit(struct net *net)
993{
Denis V. Lunevb7c6ba62008-01-28 14:41:19 -0800994 netlink_kernel_release(net->ipv4.fibnl);
Denis V. Lunev775516b2008-01-18 23:55:19 -0800995 net->ipv4.fibnl = NULL;
Robert Olsson246955f2005-06-20 13:36:39 -0700996}
997
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +0000998static void fib_disable_ip(struct net_device *dev, int force)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999{
Denis V. Lunev85326fa2008-01-31 18:48:47 -08001000 if (fib_sync_down_dev(dev, force))
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +09001001 fib_flush(dev_net(dev));
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001002 rt_cache_flush(dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 arp_ifdown(dev);
1004}
1005
1006static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
1007{
Jianjun Kong6ed25332008-11-03 00:25:16 -08001008 struct in_ifaddr *ifa = (struct in_ifaddr *)ptr;
Denis V. Lunev76e6ebf2008-07-05 19:00:44 -07001009 struct net_device *dev = ifa->ifa_dev->dev;
David S. Miller436c3b62011-03-24 17:42:21 -07001010 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011
1012 switch (event) {
1013 case NETDEV_UP:
1014 fib_add_ifaddr(ifa);
1015#ifdef CONFIG_IP_ROUTE_MULTIPATH
Denis V. Lunev76e6ebf2008-07-05 19:00:44 -07001016 fib_sync_up(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017#endif
David S. Miller436c3b62011-03-24 17:42:21 -07001018 atomic_inc(&net->ipv4.dev_addr_genid);
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001019 rt_cache_flush(dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 break;
1021 case NETDEV_DOWN:
Julian Anastasove6abbaa2011-03-19 12:13:49 +00001022 fib_del_ifaddr(ifa, NULL);
David S. Miller436c3b62011-03-24 17:42:21 -07001023 atomic_inc(&net->ipv4.dev_addr_genid);
Jayachandran C9fcc2e82005-10-27 15:10:01 -07001024 if (ifa->ifa_dev->ifa_list == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 /* Last address was deleted from this interface.
Eric Dumazet6a31d2a2010-10-04 20:00:18 +00001026 * Disable IP.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 */
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001028 fib_disable_ip(dev, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 } else {
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001030 rt_cache_flush(dev_net(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 }
1032 break;
1033 }
1034 return NOTIFY_DONE;
1035}
1036
1037static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1038{
Jiri Pirko351638e2013-05-28 01:30:21 +00001039 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
Eric Dumazet0115e8e2012-08-22 17:19:46 +00001040 struct in_device *in_dev;
David S. Miller436c3b62011-03-24 17:42:21 -07001041 struct net *net = dev_net(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042
1043 if (event == NETDEV_UNREGISTER) {
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001044 fib_disable_ip(dev, 2);
David S. Millercaacf052012-07-31 15:06:50 -07001045 rt_flush_dev(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 return NOTIFY_DONE;
1047 }
1048
Eric Dumazet0115e8e2012-08-22 17:19:46 +00001049 in_dev = __in_dev_get_rtnl(dev);
Oliver Hartkoppa0065f22014-01-23 10:19:34 +01001050 if (!in_dev)
1051 return NOTIFY_DONE;
Eric Dumazet0115e8e2012-08-22 17:19:46 +00001052
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 switch (event) {
1054 case NETDEV_UP:
1055 for_ifa(in_dev) {
1056 fib_add_ifaddr(ifa);
1057 } endfor_ifa(in_dev);
1058#ifdef CONFIG_IP_ROUTE_MULTIPATH
1059 fib_sync_up(dev);
1060#endif
David S. Miller436c3b62011-03-24 17:42:21 -07001061 atomic_inc(&net->ipv4.dev_addr_genid);
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001062 rt_cache_flush(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 break;
1064 case NETDEV_DOWN:
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001065 fib_disable_ip(dev, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 break;
1067 case NETDEV_CHANGEMTU:
1068 case NETDEV_CHANGE:
Nicolas Dichtel4ccfe6d2012-09-07 00:45:29 +00001069 rt_cache_flush(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 break;
1071 }
1072 return NOTIFY_DONE;
1073}
1074
1075static struct notifier_block fib_inetaddr_notifier = {
Jianjun Kong6ed25332008-11-03 00:25:16 -08001076 .notifier_call = fib_inetaddr_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077};
1078
1079static struct notifier_block fib_netdev_notifier = {
Jianjun Kong6ed25332008-11-03 00:25:16 -08001080 .notifier_call = fib_netdev_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081};
1082
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001083static int __net_init ip_fib_net_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084{
Denis V. Lunevdce5cbe2008-01-31 18:44:53 -08001085 int err;
Eric Dumazet10da66f2010-10-13 08:22:03 +00001086 size_t size = sizeof(struct hlist_head) * FIB_TABLE_HASHSZ;
Patrick McHardy1af5a8c2006-08-10 23:10:46 -07001087
Eric Dumazet10da66f2010-10-13 08:22:03 +00001088 /* Avoid false sharing : Use at least a full cache line */
1089 size = max_t(size_t, size, L1_CACHE_BYTES);
1090
1091 net->ipv4.fib_table_hash = kzalloc(size, GFP_KERNEL);
Denis V. Luneve4aef8a2008-01-10 03:28:24 -08001092 if (net->ipv4.fib_table_hash == NULL)
1093 return -ENOMEM;
1094
Denis V. Lunevdce5cbe2008-01-31 18:44:53 -08001095 err = fib4_rules_init(net);
1096 if (err < 0)
1097 goto fail;
1098 return 0;
1099
1100fail:
1101 kfree(net->ipv4.fib_table_hash);
1102 return err;
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001103}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00001105static void ip_fib_net_exit(struct net *net)
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001106{
1107 unsigned int i;
Thomas Graf63f34442007-03-22 11:55:17 -07001108
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001109#ifdef CONFIG_IP_MULTIPLE_TABLES
1110 fib4_rules_exit(net);
1111#endif
1112
Eric Dumazete2666f82011-03-30 16:57:46 -07001113 rtnl_lock();
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001114 for (i = 0; i < FIB_TABLE_HASHSZ; i++) {
1115 struct fib_table *tb;
1116 struct hlist_head *head;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001117 struct hlist_node *tmp;
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001118
Denis V. Luneve4aef8a2008-01-10 03:28:24 -08001119 head = &net->ipv4.fib_table_hash[i];
Sasha Levinb67bfe02013-02-27 17:06:00 -08001120 hlist_for_each_entry_safe(tb, tmp, head, tb_hlist) {
1121 hlist_del(&tb->tb_hlist);
Stephen Hemminger16c6cf82009-09-20 10:35:36 +00001122 fib_table_flush(tb);
Pavel Emelyanov4aa2c462010-10-28 02:00:43 +00001123 fib_free_table(tb);
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001124 }
1125 }
Eric Dumazete2666f82011-03-30 16:57:46 -07001126 rtnl_unlock();
Denis V. Luneve4aef8a2008-01-10 03:28:24 -08001127 kfree(net->ipv4.fib_table_hash);
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001128}
1129
1130static int __net_init fib_net_init(struct net *net)
1131{
1132 int error;
1133
David S. Millerf4530fa2012-07-05 22:13:13 -07001134#ifdef CONFIG_IP_ROUTE_CLASSID
1135 net->ipv4.fib_num_tclassid_users = 0;
1136#endif
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001137 error = ip_fib_net_init(net);
1138 if (error < 0)
1139 goto out;
1140 error = nl_fib_lookup_init(net);
1141 if (error < 0)
1142 goto out_nlfl;
1143 error = fib_proc_init(net);
1144 if (error < 0)
1145 goto out_proc;
1146out:
1147 return error;
1148
1149out_proc:
1150 nl_fib_lookup_exit(net);
1151out_nlfl:
1152 ip_fib_net_exit(net);
1153 goto out;
1154}
1155
1156static void __net_exit fib_net_exit(struct net *net)
1157{
1158 fib_proc_exit(net);
1159 nl_fib_lookup_exit(net);
1160 ip_fib_net_exit(net);
1161}
1162
1163static struct pernet_operations fib_net_ops = {
1164 .init = fib_net_init,
1165 .exit = fib_net_exit,
1166};
1167
1168void __init ip_fib_init(void)
1169{
Greg Rosec7ac8672011-06-10 01:27:09 +00001170 rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL, NULL);
1171 rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL, NULL);
1172 rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib, NULL);
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -08001173
1174 register_pernet_subsys(&fib_net_ops);
1175 register_netdevice_notifier(&fib_netdev_notifier);
1176 register_inetaddr_notifier(&fib_inetaddr_notifier);
Stephen Hemminger7f9b8052008-01-14 23:14:20 -08001177
David S. Miller5348ba82011-02-01 15:30:56 -08001178 fib_trie_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179}