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>
22 #include <net/inetpeer.h>
39 struct rtnexthop
*fc_mp
;
44 struct nl_info fc_nlinfo
;
50 struct net_device
*nh_dev
;
51 struct hlist_node nh_hash
;
52 struct fib_info
*nh_parent
;
53 unsigned int nh_flags
;
54 unsigned char nh_scope
;
55 #ifdef CONFIG_IP_ROUTE_MULTIPATH
59 #ifdef CONFIG_IP_ROUTE_CLASSID
69 * This structure contains data shared by many of routes.
73 struct hlist_node fib_hash
;
74 struct hlist_node fib_lhash
;
78 unsigned int fib_flags
;
79 unsigned char fib_dead
;
80 unsigned char fib_protocol
;
81 unsigned char fib_scope
;
85 #define fib_mtu fib_metrics[RTAX_MTU-1]
86 #define fib_window fib_metrics[RTAX_WINDOW-1]
87 #define fib_rtt fib_metrics[RTAX_RTT-1]
88 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
90 #ifdef CONFIG_IP_ROUTE_MULTIPATH
94 struct fib_nh fib_nh
[0];
95 #define fib_dev fib_nh[0].nh_dev
99 #ifdef CONFIG_IP_MULTIPLE_TABLES
105 unsigned char prefixlen
;
106 unsigned char nh_sel
;
110 struct fib_table
*table
;
111 struct list_head
*fa_head
;
112 #ifdef CONFIG_IP_MULTIPLE_TABLES
117 struct fib_result_nl
{
118 __be32 fl_addr
; /* To be looked up*/
120 unsigned char fl_tos
;
121 unsigned char fl_scope
;
122 unsigned char tb_id_in
;
124 unsigned char tb_id
; /* Results */
125 unsigned char prefixlen
;
126 unsigned char nh_sel
;
132 #ifdef CONFIG_IP_ROUTE_MULTIPATH
134 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
136 #define FIB_TABLE_HASHSZ 2
138 #else /* CONFIG_IP_ROUTE_MULTIPATH */
140 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
142 #define FIB_TABLE_HASHSZ 256
144 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
146 extern __be32
fib_info_update_nh_saddr(struct net
*net
, struct fib_nh
*nh
);
148 #define FIB_RES_SADDR(net, res) \
149 ((FIB_RES_NH(res).nh_saddr_genid == \
150 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
151 FIB_RES_NH(res).nh_saddr : \
152 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
153 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
154 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
155 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
157 #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
158 FIB_RES_SADDR(net, res))
161 struct hlist_node tb_hlist
;
165 unsigned long tb_data
[0];
168 extern int fib_table_lookup(struct fib_table
*tb
, const struct flowi4
*flp
,
169 struct fib_result
*res
, int fib_flags
);
170 extern int fib_table_insert(struct fib_table
*, struct fib_config
*);
171 extern int fib_table_delete(struct fib_table
*, struct fib_config
*);
172 extern int fib_table_dump(struct fib_table
*table
, struct sk_buff
*skb
,
173 struct netlink_callback
*cb
);
174 extern int fib_table_flush(struct fib_table
*table
);
175 extern void fib_free_table(struct fib_table
*tb
);
179 #ifndef CONFIG_IP_MULTIPLE_TABLES
181 #define TABLE_LOCAL_INDEX 0
182 #define TABLE_MAIN_INDEX 1
184 static inline struct fib_table
*fib_get_table(struct net
*net
, u32 id
)
186 struct hlist_head
*ptr
;
188 ptr
= id
== RT_TABLE_LOCAL
?
189 &net
->ipv4
.fib_table_hash
[TABLE_LOCAL_INDEX
] :
190 &net
->ipv4
.fib_table_hash
[TABLE_MAIN_INDEX
];
191 return hlist_entry(ptr
->first
, struct fib_table
, tb_hlist
);
194 static inline struct fib_table
*fib_new_table(struct net
*net
, u32 id
)
196 return fib_get_table(net
, id
);
199 static inline int fib_lookup(struct net
*net
, const struct flowi4
*flp
,
200 struct fib_result
*res
)
202 struct fib_table
*table
;
204 table
= fib_get_table(net
, RT_TABLE_LOCAL
);
205 if (!fib_table_lookup(table
, flp
, res
, FIB_LOOKUP_NOREF
))
208 table
= fib_get_table(net
, RT_TABLE_MAIN
);
209 if (!fib_table_lookup(table
, flp
, res
, FIB_LOOKUP_NOREF
))
214 #else /* CONFIG_IP_MULTIPLE_TABLES */
215 extern int __net_init
fib4_rules_init(struct net
*net
);
216 extern void __net_exit
fib4_rules_exit(struct net
*net
);
218 #ifdef CONFIG_IP_ROUTE_CLASSID
219 extern u32
fib_rules_tclass(const struct fib_result
*res
);
222 extern struct fib_table
*fib_new_table(struct net
*net
, u32 id
);
223 extern struct fib_table
*fib_get_table(struct net
*net
, u32 id
);
225 extern int __fib_lookup(struct net
*net
, struct flowi4
*flp
,
226 struct fib_result
*res
);
228 static inline int fib_lookup(struct net
*net
, struct flowi4
*flp
,
229 struct fib_result
*res
)
231 if (!net
->ipv4
.fib_has_custom_rules
) {
233 if (net
->ipv4
.fib_local
&&
234 !fib_table_lookup(net
->ipv4
.fib_local
, flp
, res
,
237 if (net
->ipv4
.fib_main
&&
238 !fib_table_lookup(net
->ipv4
.fib_main
, flp
, res
,
241 if (net
->ipv4
.fib_default
&&
242 !fib_table_lookup(net
->ipv4
.fib_default
, flp
, res
,
247 return __fib_lookup(net
, flp
, res
);
250 #endif /* CONFIG_IP_MULTIPLE_TABLES */
252 /* Exported by fib_frontend.c */
253 extern const struct nla_policy rtm_ipv4_policy
[];
254 extern void ip_fib_init(void);
255 extern __be32
fib_compute_spec_dst(struct sk_buff
*skb
);
256 extern int fib_validate_source(struct sk_buff
*skb
, __be32 src
, __be32 dst
,
257 u8 tos
, int oif
, struct net_device
*dev
,
258 struct in_device
*idev
, u32
*itag
);
259 extern void fib_select_default(struct fib_result
*res
);
260 #ifdef CONFIG_IP_ROUTE_CLASSID
261 static inline int fib_num_tclassid_users(struct net
*net
)
263 return net
->ipv4
.fib_num_tclassid_users
;
266 static inline int fib_num_tclassid_users(struct net
*net
)
272 /* Exported by fib_semantics.c */
273 extern int ip_fib_check_default(__be32 gw
, struct net_device
*dev
);
274 extern int fib_sync_down_dev(struct net_device
*dev
, int force
);
275 extern int fib_sync_down_addr(struct net
*net
, __be32 local
);
276 extern void fib_update_nh_saddrs(struct net_device
*dev
);
277 extern int fib_sync_up(struct net_device
*dev
);
278 extern void fib_select_multipath(struct fib_result
*res
);
280 /* Exported by fib_trie.c */
281 extern void fib_trie_init(void);
282 extern struct fib_table
*fib_trie_table(u32 id
);
284 static inline void fib_combine_itag(u32
*itag
, const struct fib_result
*res
)
286 #ifdef CONFIG_IP_ROUTE_CLASSID
287 #ifdef CONFIG_IP_MULTIPLE_TABLES
290 *itag
= FIB_RES_NH(*res
).nh_tclassid
<<16;
291 #ifdef CONFIG_IP_MULTIPLE_TABLES
292 rtag
= fib_rules_tclass(res
);
300 extern void free_fib_info(struct fib_info
*fi
);
302 static inline void fib_info_put(struct fib_info
*fi
)
304 if (atomic_dec_and_test(&fi
->fib_clntref
))
308 #ifdef CONFIG_PROC_FS
309 extern int __net_init
fib_proc_init(struct net
*net
);
310 extern void __net_exit
fib_proc_exit(struct net
*net
);
312 static inline int fib_proc_init(struct net
*net
)
316 static inline void fib_proc_exit(struct net
*net
)
321 #endif /* _NET_FIB_H */