2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * Definitions for the Forwarding Information Base.
8 * Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru>
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.
20 #include <linux/seq_file.h>
21 #include <net/fib_rules.h>
38 struct rtnexthop
*fc_mp
;
43 struct nl_info fc_nlinfo
;
49 struct net_device
*nh_dev
;
50 struct hlist_node nh_hash
;
51 struct fib_info
*nh_parent
;
53 unsigned char nh_scope
;
54 #ifdef CONFIG_IP_ROUTE_MULTIPATH
58 #ifdef CONFIG_NET_CLS_ROUTE
66 * This structure contains data shared by many of routes.
70 struct hlist_node fib_hash
;
71 struct hlist_node fib_lhash
;
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]
86 #ifdef CONFIG_IP_ROUTE_MULTIPATH
90 struct fib_nh fib_nh
[0];
91 #define fib_dev fib_nh[0].nh_dev
95 #ifdef CONFIG_IP_MULTIPLE_TABLES
100 unsigned char prefixlen
;
101 unsigned char nh_sel
;
105 #ifdef CONFIG_IP_MULTIPLE_TABLES
110 struct fib_result_nl
{
111 __be32 fl_addr
; /* To be looked up*/
113 unsigned char fl_tos
;
114 unsigned char fl_scope
;
115 unsigned char tb_id_in
;
117 unsigned char tb_id
; /* Results */
118 unsigned char prefixlen
;
119 unsigned char nh_sel
;
125 #ifdef CONFIG_IP_ROUTE_MULTIPATH
127 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
129 #define FIB_TABLE_HASHSZ 2
131 #else /* CONFIG_IP_ROUTE_MULTIPATH */
133 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
135 #define FIB_TABLE_HASHSZ 256
137 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
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)
145 struct hlist_node tb_hlist
;
148 unsigned char tb_data
[0];
151 extern int fib_table_lookup(struct fib_table
*tb
, const struct flowi
*flp
,
152 struct fib_result
*res
, int fib_flags
);
153 extern int fib_table_insert(struct fib_table
*, struct fib_config
*);
154 extern int fib_table_delete(struct fib_table
*, struct fib_config
*);
155 extern int fib_table_dump(struct fib_table
*table
, struct sk_buff
*skb
,
156 struct netlink_callback
*cb
);
157 extern int fib_table_flush(struct fib_table
*table
);
158 extern void fib_table_select_default(struct fib_table
*table
,
159 const struct flowi
*flp
,
160 struct fib_result
*res
);
163 #ifndef CONFIG_IP_MULTIPLE_TABLES
165 #define TABLE_LOCAL_INDEX 0
166 #define TABLE_MAIN_INDEX 1
168 static inline struct fib_table
*fib_get_table(struct net
*net
, u32 id
)
170 struct hlist_head
*ptr
;
172 ptr
= id
== RT_TABLE_LOCAL
?
173 &net
->ipv4
.fib_table_hash
[TABLE_LOCAL_INDEX
] :
174 &net
->ipv4
.fib_table_hash
[TABLE_MAIN_INDEX
];
175 return hlist_entry(ptr
->first
, struct fib_table
, tb_hlist
);
178 static inline struct fib_table
*fib_new_table(struct net
*net
, u32 id
)
180 return fib_get_table(net
, id
);
183 static inline int fib_lookup(struct net
*net
, const struct flowi
*flp
,
184 struct fib_result
*res
)
186 struct fib_table
*table
;
188 table
= fib_get_table(net
, RT_TABLE_LOCAL
);
189 if (!fib_table_lookup(table
, flp
, res
, FIB_LOOKUP_NOREF
))
192 table
= fib_get_table(net
, RT_TABLE_MAIN
);
193 if (!fib_table_lookup(table
, flp
, res
, FIB_LOOKUP_NOREF
))
198 #else /* CONFIG_IP_MULTIPLE_TABLES */
199 extern int __net_init
fib4_rules_init(struct net
*net
);
200 extern void __net_exit
fib4_rules_exit(struct net
*net
);
202 #ifdef CONFIG_NET_CLS_ROUTE
203 extern u32
fib_rules_tclass(struct fib_result
*res
);
206 extern int fib_lookup(struct net
*n
, struct flowi
*flp
, struct fib_result
*res
);
208 extern struct fib_table
*fib_new_table(struct net
*net
, u32 id
);
209 extern struct fib_table
*fib_get_table(struct net
*net
, u32 id
);
211 #endif /* CONFIG_IP_MULTIPLE_TABLES */
213 /* Exported by fib_frontend.c */
214 extern const struct nla_policy rtm_ipv4_policy
[];
215 extern void ip_fib_init(void);
216 extern int fib_validate_source(__be32 src
, __be32 dst
, u8 tos
, int oif
,
217 struct net_device
*dev
, __be32
*spec_dst
,
218 u32
*itag
, u32 mark
);
219 extern void fib_select_default(struct net
*net
, const struct flowi
*flp
,
220 struct fib_result
*res
);
222 /* Exported by fib_semantics.c */
223 extern int ip_fib_check_default(__be32 gw
, struct net_device
*dev
);
224 extern int fib_sync_down_dev(struct net_device
*dev
, int force
);
225 extern int fib_sync_down_addr(struct net
*net
, __be32 local
);
226 extern int fib_sync_up(struct net_device
*dev
);
227 extern __be32
__fib_res_prefsrc(struct fib_result
*res
);
228 extern void fib_select_multipath(const struct flowi
*flp
, struct fib_result
*res
);
230 /* Exported by fib_{hash|trie}.c */
231 extern void fib_hash_init(void);
232 extern struct fib_table
*fib_hash_table(u32 id
);
234 static inline void fib_combine_itag(u32
*itag
, struct fib_result
*res
)
236 #ifdef CONFIG_NET_CLS_ROUTE
237 #ifdef CONFIG_IP_MULTIPLE_TABLES
240 *itag
= FIB_RES_NH(*res
).nh_tclassid
<<16;
241 #ifdef CONFIG_IP_MULTIPLE_TABLES
242 rtag
= fib_rules_tclass(res
);
250 extern void free_fib_info(struct fib_info
*fi
);
252 static inline void fib_info_put(struct fib_info
*fi
)
254 if (atomic_dec_and_test(&fi
->fib_clntref
))
258 #ifdef CONFIG_PROC_FS
259 extern int __net_init
fib_proc_init(struct net
*net
);
260 extern void __net_exit
fib_proc_exit(struct net
*net
);
262 static inline int fib_proc_init(struct net
*net
)
266 static inline void fib_proc_exit(struct net
*net
)
271 #endif /* _NET_FIB_H */