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
;
79 u32 fib_metrics
[RTAX_MAX
];
80 #define fib_mtu fib_metrics[RTAX_MTU-1]
81 #define fib_window fib_metrics[RTAX_WINDOW-1]
82 #define fib_rtt fib_metrics[RTAX_RTT-1]
83 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
85 #ifdef CONFIG_IP_ROUTE_MULTIPATH
88 struct fib_nh fib_nh
[0];
89 #define fib_dev fib_nh[0].nh_dev
93 #ifdef CONFIG_IP_MULTIPLE_TABLES
98 unsigned char prefixlen
;
103 #ifdef CONFIG_IP_MULTIPLE_TABLES
108 struct fib_result_nl
{
109 __be32 fl_addr
; /* To be looked up*/
111 unsigned char fl_tos
;
112 unsigned char fl_scope
;
113 unsigned char tb_id_in
;
115 unsigned char tb_id
; /* Results */
116 unsigned char prefixlen
;
117 unsigned char nh_sel
;
123 extern struct hlist_head fib_table_hash
[];
125 #ifdef CONFIG_IP_ROUTE_MULTIPATH
127 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
128 #define FIB_RES_RESET(res) ((res).nh_sel = 0)
130 #define FIB_TABLE_HASHSZ 2
132 #else /* CONFIG_IP_ROUTE_MULTIPATH */
134 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
135 #define FIB_RES_RESET(res)
137 #define FIB_TABLE_HASHSZ 256
139 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
141 #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
142 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
143 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
144 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
147 struct hlist_node tb_hlist
;
151 int (*tb_lookup
)(struct fib_table
*tb
, const struct flowi
*flp
, struct fib_result
*res
);
152 int (*tb_insert
)(struct fib_table
*, struct fib_config
*);
153 int (*tb_delete
)(struct fib_table
*, struct fib_config
*);
154 int (*tb_dump
)(struct fib_table
*table
, struct sk_buff
*skb
,
155 struct netlink_callback
*cb
);
156 int (*tb_flush
)(struct fib_table
*table
);
157 void (*tb_select_default
)(struct fib_table
*table
,
158 const struct flowi
*flp
, struct fib_result
*res
);
160 unsigned char tb_data
[0];
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 &fib_table_hash
[TABLE_LOCAL_INDEX
] :
174 &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(const struct flowi
*flp
, struct fib_result
*res
)
185 struct fib_table
*table
;
187 table
= fib_get_table(&init_net
, RT_TABLE_LOCAL
);
188 if (!table
->tb_lookup(table
, flp
, res
))
191 table
= fib_get_table(&init_net
, RT_TABLE_MAIN
);
192 if (!table
->tb_lookup(table
, flp
, res
))
197 static inline void fib_select_default(const struct flowi
*flp
,
198 struct fib_result
*res
)
200 struct fib_table
*table
= fib_get_table(&init_net
, RT_TABLE_MAIN
);
201 if (FIB_RES_GW(*res
) && FIB_RES_NH(*res
).nh_scope
== RT_SCOPE_LINK
)
202 table
->tb_select_default(table
, flp
, res
);
205 #else /* CONFIG_IP_MULTIPLE_TABLES */
206 extern int __net_init
fib4_rules_init(struct net
*net
);
207 extern void __net_exit
fib4_rules_exit(struct net
*net
);
209 #ifdef CONFIG_NET_CLS_ROUTE
210 extern u32
fib_rules_tclass(struct fib_result
*res
);
213 extern int fib_lookup(struct flowi
*flp
, struct fib_result
*res
);
215 extern struct fib_table
*fib_new_table(struct net
*net
, u32 id
);
216 extern struct fib_table
*fib_get_table(struct net
*net
, u32 id
);
217 extern void fib_select_default(const struct flowi
*flp
, struct fib_result
*res
);
219 #endif /* CONFIG_IP_MULTIPLE_TABLES */
221 /* Exported by fib_frontend.c */
222 extern const struct nla_policy rtm_ipv4_policy
[];
223 extern void ip_fib_init(void);
224 extern int fib_validate_source(__be32 src
, __be32 dst
, u8 tos
, int oif
,
225 struct net_device
*dev
, __be32
*spec_dst
, u32
*itag
);
226 extern void fib_select_multipath(const struct flowi
*flp
, struct fib_result
*res
);
230 /* Exported by fib_semantics.c */
231 extern int ip_fib_check_default(__be32 gw
, struct net_device
*dev
);
232 extern int fib_sync_down(__be32 local
, struct net_device
*dev
, int force
);
233 extern int fib_sync_up(struct net_device
*dev
);
234 extern __be32
__fib_res_prefsrc(struct fib_result
*res
);
236 /* Exported by fib_hash.c */
237 extern struct fib_table
*fib_hash_init(u32 id
);
239 static inline void fib_combine_itag(u32
*itag
, struct fib_result
*res
)
241 #ifdef CONFIG_NET_CLS_ROUTE
242 #ifdef CONFIG_IP_MULTIPLE_TABLES
245 *itag
= FIB_RES_NH(*res
).nh_tclassid
<<16;
246 #ifdef CONFIG_IP_MULTIPLE_TABLES
247 rtag
= fib_rules_tclass(res
);
255 extern void free_fib_info(struct fib_info
*fi
);
257 static inline void fib_info_put(struct fib_info
*fi
)
259 if (atomic_dec_and_test(&fi
->fib_clntref
))
263 static inline void fib_res_put(struct fib_result
*res
)
266 fib_info_put(res
->fi
);
267 #ifdef CONFIG_IP_MULTIPLE_TABLES
269 fib_rule_put(res
->r
);
273 #ifdef CONFIG_PROC_FS
274 extern int __net_init
fib_proc_init(struct net
*net
);
275 extern void __net_exit
fib_proc_exit(struct net
*net
);
278 #endif /* _NET_FIB_H */