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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 * Definitions for the Forwarding Information Base.
7 *
8 * Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16#ifndef _NET_IP_FIB_H
17#define _NET_IP_FIB_H
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <net/flow.h>
20#include <linux/seq_file.h>
Thomas Grafe1ef4bf2006-08-04 03:39:22 -070021#include <net/fib_rules.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Thomas Graf4e902c52006-08-17 18:14:52 -070023struct fib_config {
Thomas Graf4e902c52006-08-17 18:14:52 -070024 u8 fc_dst_len;
Thomas Graf4e902c52006-08-17 18:14:52 -070025 u8 fc_tos;
26 u8 fc_protocol;
27 u8 fc_scope;
28 u8 fc_type;
Thomas Grafb52f0702006-10-18 20:26:36 -070029 /* 3 bytes unused */
Thomas Graf4e902c52006-08-17 18:14:52 -070030 u32 fc_table;
Al Viro6d85c102006-09-26 22:15:46 -070031 __be32 fc_dst;
Al Viro6d85c102006-09-26 22:15:46 -070032 __be32 fc_gw;
Thomas Graf4e902c52006-08-17 18:14:52 -070033 int fc_oif;
34 u32 fc_flags;
35 u32 fc_priority;
Al Viro6d85c102006-09-26 22:15:46 -070036 __be32 fc_prefsrc;
Thomas Graf4e902c52006-08-17 18:14:52 -070037 struct nlattr *fc_mx;
38 struct rtnexthop *fc_mp;
39 int fc_mx_len;
40 int fc_mp_len;
41 u32 fc_flow;
Thomas Graf4e902c52006-08-17 18:14:52 -070042 u32 fc_nlflags;
43 struct nl_info fc_nlinfo;
44 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46struct fib_info;
47
48struct fib_nh {
49 struct net_device *nh_dev;
50 struct hlist_node nh_hash;
51 struct fib_info *nh_parent;
52 unsigned nh_flags;
53 unsigned char nh_scope;
54#ifdef CONFIG_IP_ROUTE_MULTIPATH
55 int nh_weight;
56 int nh_power;
57#endif
Patrick McHardyc7066f72011-01-14 13:36:42 +010058#ifdef CONFIG_IP_ROUTE_CLASSID
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 __u32 nh_tclassid;
60#endif
61 int nh_oif;
Al Viroed49e3c2006-09-26 22:13:54 -070062 __be32 nh_gw;
David S. Miller1fc050a2011-03-07 20:54:48 -080063 __be32 nh_saddr;
David S. Miller436c3b62011-03-24 17:42:21 -070064 int nh_saddr_genid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065};
66
67/*
68 * This structure contains data shared by many of routes.
69 */
70
71struct fib_info {
72 struct hlist_node fib_hash;
73 struct hlist_node fib_lhash;
Denis V. Lunev7462bd742008-01-31 18:49:32 -080074 struct net *fib_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 int fib_treeref;
76 atomic_t fib_clntref;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 unsigned fib_flags;
David S. Miller37e826c2011-03-24 18:06:47 -070078 unsigned char fib_dead;
79 unsigned char fib_protocol;
80 unsigned char fib_scope;
Al Virob83738a2006-09-26 22:14:15 -070081 __be32 fib_prefsrc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 u32 fib_priority;
David S. Miller9c150e82011-01-28 14:01:25 -080083 u32 *fib_metrics;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084#define fib_mtu fib_metrics[RTAX_MTU-1]
85#define fib_window fib_metrics[RTAX_WINDOW-1]
86#define fib_rtt fib_metrics[RTAX_RTT-1]
87#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
88 int fib_nhs;
89#ifdef CONFIG_IP_ROUTE_MULTIPATH
90 int fib_power;
91#endif
Eric Dumazetebc0ffa2010-10-05 10:41:36 +000092 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 struct fib_nh fib_nh[0];
94#define fib_dev fib_nh[0].nh_dev
95};
96
97
98#ifdef CONFIG_IP_MULTIPLE_TABLES
99struct fib_rule;
100#endif
101
David S. Miller5b470442011-01-31 16:10:03 -0800102struct fib_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103struct fib_result {
104 unsigned char prefixlen;
105 unsigned char nh_sel;
106 unsigned char type;
107 unsigned char scope;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 struct fib_info *fi;
David S. Miller5b470442011-01-31 16:10:03 -0800109 struct fib_table *table;
110 struct list_head *fa_head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111#ifdef CONFIG_IP_MULTIPLE_TABLES
112 struct fib_rule *r;
113#endif
114};
115
Robert Olsson246955f2005-06-20 13:36:39 -0700116struct fib_result_nl {
Al Viro80e856e2006-09-26 22:19:36 -0700117 __be32 fl_addr; /* To be looked up*/
Thomas Graf5f3008932006-11-09 15:21:41 -0800118 u32 fl_mark;
Robert Olsson246955f2005-06-20 13:36:39 -0700119 unsigned char fl_tos;
120 unsigned char fl_scope;
121 unsigned char tb_id_in;
122
123 unsigned char tb_id; /* Results */
124 unsigned char prefixlen;
125 unsigned char nh_sel;
126 unsigned char type;
127 unsigned char scope;
128 int err;
129};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131#ifdef CONFIG_IP_ROUTE_MULTIPATH
132
133#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Denis V. Lunev93456b62008-01-10 03:23:38 -0800135#define FIB_TABLE_HASHSZ 2
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137#else /* CONFIG_IP_ROUTE_MULTIPATH */
138
139#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Denis V. Lunev93456b62008-01-10 03:23:38 -0800141#define FIB_TABLE_HASHSZ 256
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143#endif /* CONFIG_IP_ROUTE_MULTIPATH */
144
David S. Miller436c3b62011-03-24 17:42:21 -0700145extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
146
147#define FIB_RES_SADDR(net, res) \
148 ((FIB_RES_NH(res).nh_saddr_genid == \
149 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
150 FIB_RES_NH(res).nh_saddr : \
151 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
153#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
154#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
155
David S. Miller436c3b62011-03-24 17:42:21 -0700156#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
157 FIB_RES_SADDR(net, res))
David S. Miller1fc050a2011-03-07 20:54:48 -0800158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159struct fib_table {
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700160 struct hlist_node tb_hlist;
Patrick McHardy2dfe55b2006-08-10 23:08:33 -0700161 u32 tb_id;
Denis V. Lunev971b8932007-12-08 00:32:23 -0800162 int tb_default;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 unsigned char tb_data[0];
164};
165
David S. Miller22bd5b92011-03-11 19:54:08 -0500166extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000167 struct fib_result *res, int fib_flags);
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000168extern int fib_table_insert(struct fib_table *, struct fib_config *);
169extern int fib_table_delete(struct fib_table *, struct fib_config *);
170extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
171 struct netlink_callback *cb);
172extern int fib_table_flush(struct fib_table *table);
Pavel Emelyanov4aa2c462010-10-28 02:00:43 +0000173extern void fib_free_table(struct fib_table *tb);
174
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000175
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177#ifndef CONFIG_IP_MULTIPLE_TABLES
178
Denis V. Lunev93456b62008-01-10 03:23:38 -0800179#define TABLE_LOCAL_INDEX 0
180#define TABLE_MAIN_INDEX 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800182static inline struct fib_table *fib_get_table(struct net *net, u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
Denis V. Lunev93456b62008-01-10 03:23:38 -0800184 struct hlist_head *ptr;
185
186 ptr = id == RT_TABLE_LOCAL ?
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800187 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
188 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
Denis V. Lunev93456b62008-01-10 03:23:38 -0800189 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800192static inline struct fib_table *fib_new_table(struct net *net, u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800194 return fib_get_table(net, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195}
196
David S. Miller22bd5b92011-03-11 19:54:08 -0500197static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800198 struct fib_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199{
Denis V. Lunev93456b62008-01-10 03:23:38 -0800200 struct fib_table *table;
201
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800202 table = fib_get_table(net, RT_TABLE_LOCAL);
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000203 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
Denis V. Lunev93456b62008-01-10 03:23:38 -0800204 return 0;
205
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800206 table = fib_get_table(net, RT_TABLE_MAIN);
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000207 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
Denis V. Lunev93456b62008-01-10 03:23:38 -0800208 return 0;
209 return -ENETUNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210}
211
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212#else /* CONFIG_IP_MULTIPLE_TABLES */
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -0800213extern int __net_init fib4_rules_init(struct net *net);
214extern void __net_exit fib4_rules_exit(struct net *net);
Pavel Emelyanovc3e9a352007-11-06 23:34:04 -0800215
Patrick McHardyc7066f72011-01-14 13:36:42 +0100216#ifdef CONFIG_IP_ROUTE_CLASSID
David S. Miller982721f2011-02-16 21:44:24 -0800217extern u32 fib_rules_tclass(const struct fib_result *res);
Pavel Emelyanovc3e9a352007-11-06 23:34:04 -0800218#endif
219
David S. Miller22bd5b92011-03-11 19:54:08 -0500220extern int fib_lookup(struct net *n, struct flowi4 *flp, struct fib_result *res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800222extern struct fib_table *fib_new_table(struct net *net, u32 id);
223extern struct fib_table *fib_get_table(struct net *net, u32 id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225#endif /* CONFIG_IP_MULTIPLE_TABLES */
226
227/* Exported by fib_frontend.c */
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700228extern const struct nla_policy rtm_ipv4_policy[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229extern void ip_fib_init(void);
Al Virod9c9df82006-09-26 21:28:14 -0700230extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
jamalb0c110c2009-10-18 02:12:33 +0000231 struct net_device *dev, __be32 *spec_dst,
232 u32 *itag, u32 mark);
David S. Miller0c838ff2011-01-31 16:16:50 -0800233extern void fib_select_default(struct fib_result *res);
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200234
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235/* Exported by fib_semantics.c */
Al Virod878e72e2006-09-26 22:18:13 -0700236extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
Denis V. Lunev85326fa2008-01-31 18:48:47 -0800237extern int fib_sync_down_dev(struct net_device *dev, int force);
Denis V. Lunev4814bdb2008-01-31 18:50:07 -0800238extern int fib_sync_down_addr(struct net *net, __be32 local);
David S. Miller1fc050a2011-03-07 20:54:48 -0800239extern void fib_update_nh_saddrs(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240extern int fib_sync_up(struct net_device *dev);
David S. Miller1b7fe5932011-03-10 17:01:16 -0800241extern void fib_select_multipath(struct fib_result *res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
David S. Miller5348ba82011-02-01 15:30:56 -0800243/* Exported by fib_trie.c */
244extern void fib_trie_init(void);
245extern struct fib_table *fib_trie_table(u32 id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
David S. Millerb6bf3ca2011-02-16 22:04:57 -0800247static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248{
Patrick McHardyc7066f72011-01-14 13:36:42 +0100249#ifdef CONFIG_IP_ROUTE_CLASSID
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250#ifdef CONFIG_IP_MULTIPLE_TABLES
251 u32 rtag;
252#endif
253 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
254#ifdef CONFIG_IP_MULTIPLE_TABLES
255 rtag = fib_rules_tclass(res);
256 if (*itag == 0)
257 *itag = (rtag<<16);
258 *itag |= (rtag>>16);
259#endif
260#endif
261}
262
263extern void free_fib_info(struct fib_info *fi);
264
265static inline void fib_info_put(struct fib_info *fi)
266{
267 if (atomic_dec_and_test(&fi->fib_clntref))
268 free_fib_info(fi);
269}
270
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300271#ifdef CONFIG_PROC_FS
Denis V. Lunev61a02652008-01-10 03:21:09 -0800272extern int __net_init fib_proc_init(struct net *net);
273extern void __net_exit fib_proc_exit(struct net *net);
Li Zefancc8274f2008-02-05 02:54:16 -0800274#else
275static inline int fib_proc_init(struct net *net)
276{
277 return 0;
278}
279static inline void fib_proc_exit(struct net *net)
280{
281}
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300282#endif
283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284#endif /* _NET_FIB_H */