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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
58#ifdef CONFIG_NET_CLS_ROUTE
59 __u32 nh_tclassid;
60#endif
61 int nh_oif;
Al Viroed49e3c2006-09-26 22:13:54 -070062 __be32 nh_gw;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063};
64
65/*
66 * This structure contains data shared by many of routes.
67 */
68
69struct fib_info {
70 struct hlist_node fib_hash;
71 struct hlist_node fib_lhash;
Denis V. Lunev7462bd742008-01-31 18:49:32 -080072 struct net *fib_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 int fib_treeref;
74 atomic_t fib_clntref;
75 int fib_dead;
76 unsigned fib_flags;
77 int fib_protocol;
Al Virob83738a2006-09-26 22:14:15 -070078 __be32 fib_prefsrc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 u32 fib_priority;
80 u32 fib_metrics[RTAX_MAX];
81#define fib_mtu fib_metrics[RTAX_MTU-1]
82#define fib_window fib_metrics[RTAX_WINDOW-1]
83#define fib_rtt fib_metrics[RTAX_RTT-1]
84#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
85 int fib_nhs;
86#ifdef CONFIG_IP_ROUTE_MULTIPATH
87 int fib_power;
88#endif
Eric Dumazetebc0ffa2010-10-05 10:41:36 +000089 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 struct fib_nh fib_nh[0];
91#define fib_dev fib_nh[0].nh_dev
92};
93
94
95#ifdef CONFIG_IP_MULTIPLE_TABLES
96struct fib_rule;
97#endif
98
99struct fib_result {
100 unsigned char prefixlen;
101 unsigned char nh_sel;
102 unsigned char type;
103 unsigned char scope;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 struct fib_info *fi;
105#ifdef CONFIG_IP_MULTIPLE_TABLES
106 struct fib_rule *r;
107#endif
108};
109
Robert Olsson246955f2005-06-20 13:36:39 -0700110struct fib_result_nl {
Al Viro80e856e2006-09-26 22:19:36 -0700111 __be32 fl_addr; /* To be looked up*/
Thomas Graf5f3008932006-11-09 15:21:41 -0800112 u32 fl_mark;
Robert Olsson246955f2005-06-20 13:36:39 -0700113 unsigned char fl_tos;
114 unsigned char fl_scope;
115 unsigned char tb_id_in;
116
117 unsigned char tb_id; /* Results */
118 unsigned char prefixlen;
119 unsigned char nh_sel;
120 unsigned char type;
121 unsigned char scope;
122 int err;
123};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125#ifdef CONFIG_IP_ROUTE_MULTIPATH
126
127#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Denis V. Lunev93456b62008-01-10 03:23:38 -0800129#define FIB_TABLE_HASHSZ 2
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131#else /* CONFIG_IP_ROUTE_MULTIPATH */
132
133#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Denis V. Lunev93456b62008-01-10 03:23:38 -0800135#define FIB_TABLE_HASHSZ 256
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137#endif /* CONFIG_IP_ROUTE_MULTIPATH */
138
139#define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
140#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
141#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
142#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144struct fib_table {
Patrick McHardy1af5a8c2006-08-10 23:10:46 -0700145 struct hlist_node tb_hlist;
Patrick McHardy2dfe55b2006-08-10 23:08:33 -0700146 u32 tb_id;
Denis V. Lunev971b8932007-12-08 00:32:23 -0800147 int tb_default;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 unsigned char tb_data[0];
149};
150
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000151extern int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000152 struct fib_result *res, int fib_flags);
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000153extern int fib_table_insert(struct fib_table *, struct fib_config *);
154extern int fib_table_delete(struct fib_table *, struct fib_config *);
155extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
156 struct netlink_callback *cb);
157extern int fib_table_flush(struct fib_table *table);
158extern void fib_table_select_default(struct fib_table *table,
159 const struct flowi *flp,
160 struct fib_result *res);
Pavel Emelyanov4aa2c462010-10-28 02:00:43 +0000161extern void fib_free_table(struct fib_table *tb);
162
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000163
164
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165#ifndef CONFIG_IP_MULTIPLE_TABLES
166
Denis V. Lunev93456b62008-01-10 03:23:38 -0800167#define TABLE_LOCAL_INDEX 0
168#define TABLE_MAIN_INDEX 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800170static inline struct fib_table *fib_get_table(struct net *net, u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171{
Denis V. Lunev93456b62008-01-10 03:23:38 -0800172 struct hlist_head *ptr;
173
174 ptr = id == RT_TABLE_LOCAL ?
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800175 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
176 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
Denis V. Lunev93456b62008-01-10 03:23:38 -0800177 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178}
179
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800180static inline struct fib_table *fib_new_table(struct net *net, u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800182 return fib_get_table(net, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800185static inline int fib_lookup(struct net *net, const struct flowi *flp,
186 struct fib_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
Denis V. Lunev93456b62008-01-10 03:23:38 -0800188 struct fib_table *table;
189
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800190 table = fib_get_table(net, RT_TABLE_LOCAL);
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000191 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
Denis V. Lunev93456b62008-01-10 03:23:38 -0800192 return 0;
193
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800194 table = fib_get_table(net, RT_TABLE_MAIN);
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000195 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
Denis V. Lunev93456b62008-01-10 03:23:38 -0800196 return 0;
197 return -ENETUNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198}
199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200#else /* CONFIG_IP_MULTIPLE_TABLES */
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -0800201extern int __net_init fib4_rules_init(struct net *net);
202extern void __net_exit fib4_rules_exit(struct net *net);
Pavel Emelyanovc3e9a352007-11-06 23:34:04 -0800203
204#ifdef CONFIG_NET_CLS_ROUTE
205extern u32 fib_rules_tclass(struct fib_result *res);
206#endif
207
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800208extern int fib_lookup(struct net *n, struct flowi *flp, struct fib_result *res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800210extern struct fib_table *fib_new_table(struct net *net, u32 id);
211extern struct fib_table *fib_get_table(struct net *net, u32 id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213#endif /* CONFIG_IP_MULTIPLE_TABLES */
214
215/* Exported by fib_frontend.c */
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700216extern const struct nla_policy rtm_ipv4_policy[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217extern void ip_fib_init(void);
Al Virod9c9df82006-09-26 21:28:14 -0700218extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
jamalb0c110c2009-10-18 02:12:33 +0000219 struct net_device *dev, __be32 *spec_dst,
220 u32 *itag, u32 mark);
Denis V. Lunev010278e2008-01-22 22:04:04 -0800221extern void fib_select_default(struct net *net, const struct flowi *flp,
222 struct fib_result *res);
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200223
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224/* Exported by fib_semantics.c */
Al Virod878e72e2006-09-26 22:18:13 -0700225extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
Denis V. Lunev85326fa2008-01-31 18:48:47 -0800226extern int fib_sync_down_dev(struct net_device *dev, int force);
Denis V. Lunev4814bdb2008-01-31 18:50:07 -0800227extern int fib_sync_down_addr(struct net *net, __be32 local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228extern int fib_sync_up(struct net_device *dev);
Al Virob83738a2006-09-26 22:14:15 -0700229extern __be32 __fib_res_prefsrc(struct fib_result *res);
Denis V. Luneve30d3a02008-01-22 22:03:03 -0800230extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Stephen Hemminger7f9b8052008-01-14 23:14:20 -0800232/* Exported by fib_{hash|trie}.c */
233extern void fib_hash_init(void);
234extern struct fib_table *fib_hash_table(u32 id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
237{
238#ifdef CONFIG_NET_CLS_ROUTE
239#ifdef CONFIG_IP_MULTIPLE_TABLES
240 u32 rtag;
241#endif
242 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
243#ifdef CONFIG_IP_MULTIPLE_TABLES
244 rtag = fib_rules_tclass(res);
245 if (*itag == 0)
246 *itag = (rtag<<16);
247 *itag |= (rtag>>16);
248#endif
249#endif
250}
251
252extern void free_fib_info(struct fib_info *fi);
253
254static inline void fib_info_put(struct fib_info *fi)
255{
256 if (atomic_dec_and_test(&fi->fib_clntref))
257 free_fib_info(fi);
258}
259
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300260#ifdef CONFIG_PROC_FS
Denis V. Lunev61a02652008-01-10 03:21:09 -0800261extern int __net_init fib_proc_init(struct net *net);
262extern void __net_exit fib_proc_exit(struct net *net);
Li Zefancc8274f2008-02-05 02:54:16 -0800263#else
264static inline int fib_proc_init(struct net *net)
265{
266 return 0;
267}
268static inline void fib_proc_exit(struct net *net)
269{
270}
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300271#endif
272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273#endif /* _NET_FIB_H */