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 <linux/rcupdate.h>
22 #include <net/fib_rules.h>
23 #include <net/inetpeer.h>
24 #include <linux/percpu.h>
41 struct rtnexthop
*fc_mp
;
46 struct nl_info fc_nlinfo
;
52 struct fib_nh_exception
{
53 struct fib_nh_exception __rcu
*fnhe_next
;
58 unsigned long fnhe_expires
;
59 struct rtable __rcu
*fnhe_rth_input
;
60 struct rtable __rcu
*fnhe_rth_output
;
61 unsigned long fnhe_stamp
;
64 struct fnhe_hash_bucket
{
65 struct fib_nh_exception __rcu
*chain
;
68 #define FNHE_HASH_SHIFT 11
69 #define FNHE_HASH_SIZE (1 << FNHE_HASH_SHIFT)
70 #define FNHE_RECLAIM_DEPTH 5
73 struct net_device
*nh_dev
;
74 struct hlist_node nh_hash
;
75 struct fib_info
*nh_parent
;
76 unsigned int nh_flags
;
77 unsigned char nh_scope
;
78 #ifdef CONFIG_IP_ROUTE_MULTIPATH
82 #ifdef CONFIG_IP_ROUTE_CLASSID
89 struct rtable __rcu
* __percpu
*nh_pcpu_rth_output
;
90 struct rtable __rcu
*nh_rth_input
;
91 struct fnhe_hash_bucket __rcu
*nh_exceptions
;
95 * This structure contains data shared by many of routes.
99 struct hlist_node fib_hash
;
100 struct hlist_node fib_lhash
;
103 atomic_t fib_clntref
;
104 unsigned int fib_flags
;
105 unsigned char fib_dead
;
106 unsigned char fib_protocol
;
107 unsigned char fib_scope
;
108 unsigned char fib_type
;
112 #define fib_mtu fib_metrics[RTAX_MTU-1]
113 #define fib_window fib_metrics[RTAX_WINDOW-1]
114 #define fib_rtt fib_metrics[RTAX_RTT-1]
115 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
117 #ifdef CONFIG_IP_ROUTE_MULTIPATH
121 struct fib_nh fib_nh
[0];
122 #define fib_dev fib_nh[0].nh_dev
126 #ifdef CONFIG_IP_MULTIPLE_TABLES
132 unsigned char prefixlen
;
133 unsigned char nh_sel
;
138 struct fib_table
*table
;
139 struct list_head
*fa_head
;
142 struct fib_result_nl
{
143 __be32 fl_addr
; /* To be looked up*/
145 unsigned char fl_tos
;
146 unsigned char fl_scope
;
147 unsigned char tb_id_in
;
149 unsigned char tb_id
; /* Results */
150 unsigned char prefixlen
;
151 unsigned char nh_sel
;
157 #ifdef CONFIG_IP_ROUTE_MULTIPATH
158 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
159 #else /* CONFIG_IP_ROUTE_MULTIPATH */
160 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
161 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
163 #ifdef CONFIG_IP_MULTIPLE_TABLES
164 #define FIB_TABLE_HASHSZ 256
166 #define FIB_TABLE_HASHSZ 2
169 __be32
fib_info_update_nh_saddr(struct net
*net
, struct fib_nh
*nh
);
171 #define FIB_RES_SADDR(net, res) \
172 ((FIB_RES_NH(res).nh_saddr_genid == \
173 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
174 FIB_RES_NH(res).nh_saddr : \
175 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
176 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
177 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
178 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
180 #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
181 FIB_RES_SADDR(net, res))
184 struct hlist_node tb_hlist
;
188 unsigned long tb_data
[0];
191 int fib_table_lookup(struct fib_table
*tb
, const struct flowi4
*flp
,
192 struct fib_result
*res
, int fib_flags
);
193 int fib_table_insert(struct fib_table
*, struct fib_config
*);
194 int fib_table_delete(struct fib_table
*, struct fib_config
*);
195 int fib_table_dump(struct fib_table
*table
, struct sk_buff
*skb
,
196 struct netlink_callback
*cb
);
197 int fib_table_flush(struct fib_table
*table
);
198 void fib_free_table(struct fib_table
*tb
);
202 #ifndef CONFIG_IP_MULTIPLE_TABLES
204 #define TABLE_LOCAL_INDEX (RT_TABLE_LOCAL & (FIB_TABLE_HASHSZ - 1))
205 #define TABLE_MAIN_INDEX (RT_TABLE_MAIN & (FIB_TABLE_HASHSZ - 1))
207 static inline struct fib_table
*fib_get_table(struct net
*net
, u32 id
)
209 struct hlist_head
*ptr
;
211 ptr
= id
== RT_TABLE_LOCAL
?
212 &net
->ipv4
.fib_table_hash
[TABLE_LOCAL_INDEX
] :
213 &net
->ipv4
.fib_table_hash
[TABLE_MAIN_INDEX
];
214 return hlist_entry(ptr
->first
, struct fib_table
, tb_hlist
);
217 static inline struct fib_table
*fib_new_table(struct net
*net
, u32 id
)
219 return fib_get_table(net
, id
);
222 static inline int fib_lookup(struct net
*net
, const struct flowi4
*flp
,
223 struct fib_result
*res
)
225 int err
= -ENETUNREACH
;
229 if (!fib_table_lookup(fib_get_table(net
, RT_TABLE_LOCAL
), flp
, res
,
231 !fib_table_lookup(fib_get_table(net
, RT_TABLE_MAIN
), flp
, res
,
240 #else /* CONFIG_IP_MULTIPLE_TABLES */
241 int __net_init
fib4_rules_init(struct net
*net
);
242 void __net_exit
fib4_rules_exit(struct net
*net
);
244 struct fib_table
*fib_new_table(struct net
*net
, u32 id
);
245 struct fib_table
*fib_get_table(struct net
*net
, u32 id
);
247 int __fib_lookup(struct net
*net
, struct flowi4
*flp
, struct fib_result
*res
);
249 static inline int fib_lookup(struct net
*net
, struct flowi4
*flp
,
250 struct fib_result
*res
)
252 if (!net
->ipv4
.fib_has_custom_rules
) {
253 int err
= -ENETUNREACH
;
258 if ((net
->ipv4
.fib_local
&&
259 !fib_table_lookup(net
->ipv4
.fib_local
, flp
, res
,
260 FIB_LOOKUP_NOREF
)) ||
261 (net
->ipv4
.fib_main
&&
262 !fib_table_lookup(net
->ipv4
.fib_main
, flp
, res
,
263 FIB_LOOKUP_NOREF
)) ||
264 (net
->ipv4
.fib_default
&&
265 !fib_table_lookup(net
->ipv4
.fib_default
, flp
, res
,
273 return __fib_lookup(net
, flp
, res
);
276 #endif /* CONFIG_IP_MULTIPLE_TABLES */
278 /* Exported by fib_frontend.c */
279 extern const struct nla_policy rtm_ipv4_policy
[];
280 void ip_fib_init(void);
281 __be32
fib_compute_spec_dst(struct sk_buff
*skb
);
282 int fib_validate_source(struct sk_buff
*skb
, __be32 src
, __be32 dst
,
283 u8 tos
, int oif
, struct net_device
*dev
,
284 struct in_device
*idev
, u32
*itag
);
285 void fib_select_default(struct fib_result
*res
);
286 #ifdef CONFIG_IP_ROUTE_CLASSID
287 static inline int fib_num_tclassid_users(struct net
*net
)
289 return net
->ipv4
.fib_num_tclassid_users
;
292 static inline int fib_num_tclassid_users(struct net
*net
)
298 /* Exported by fib_semantics.c */
299 int ip_fib_check_default(__be32 gw
, struct net_device
*dev
);
300 int fib_sync_down_dev(struct net_device
*dev
, int force
);
301 int fib_sync_down_addr(struct net
*net
, __be32 local
);
302 int fib_sync_up(struct net_device
*dev
);
303 void fib_select_multipath(struct fib_result
*res
);
305 /* Exported by fib_trie.c */
306 void fib_trie_init(void);
307 struct fib_table
*fib_trie_table(u32 id
);
309 static inline void fib_combine_itag(u32
*itag
, const struct fib_result
*res
)
311 #ifdef CONFIG_IP_ROUTE_CLASSID
312 #ifdef CONFIG_IP_MULTIPLE_TABLES
315 *itag
= FIB_RES_NH(*res
).nh_tclassid
<<16;
316 #ifdef CONFIG_IP_MULTIPLE_TABLES
317 rtag
= res
->tclassid
;
325 void free_fib_info(struct fib_info
*fi
);
327 static inline void fib_info_put(struct fib_info
*fi
)
329 if (atomic_dec_and_test(&fi
->fib_clntref
))
333 #ifdef CONFIG_PROC_FS
334 int __net_init
fib_proc_init(struct net
*net
);
335 void __net_exit
fib_proc_exit(struct net
*net
);
337 static inline int fib_proc_init(struct net
*net
)
341 static inline void fib_proc_exit(struct net
*net
)
346 #endif /* _NET_FIB_H */