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 unsigned char nh_cfg_scope;
55 #ifdef CONFIG_IP_ROUTE_MULTIPATH
59 #ifdef CONFIG_IP_ROUTE_CLASSID
68 * This structure contains data shared by many of routes.
72 struct hlist_node fib_hash;
73 struct hlist_node fib_lhash;
83 #define fib_mtu fib_metrics[RTAX_MTU-1]
84 #define fib_window fib_metrics[RTAX_WINDOW-1]
85 #define fib_rtt fib_metrics[RTAX_RTT-1]
86 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
88 #ifdef CONFIG_IP_ROUTE_MULTIPATH
92 struct fib_nh fib_nh[0];
93 #define fib_dev fib_nh[0].nh_dev
97 #ifdef CONFIG_IP_MULTIPLE_TABLES
103 unsigned char prefixlen;
104 unsigned char nh_sel;
108 struct fib_table *table;
109 struct list_head *fa_head;
110 #ifdef CONFIG_IP_MULTIPLE_TABLES
115 struct fib_result_nl {
116 __be32 fl_addr; /* To be looked up*/
118 unsigned char fl_tos;
119 unsigned char fl_scope;
120 unsigned char tb_id_in;
122 unsigned char tb_id; /* Results */
123 unsigned char prefixlen;
124 unsigned char nh_sel;
130 #ifdef CONFIG_IP_ROUTE_MULTIPATH
132 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
134 #define FIB_TABLE_HASHSZ 2
136 #else /* CONFIG_IP_ROUTE_MULTIPATH */
138 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
140 #define FIB_TABLE_HASHSZ 256
142 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
144 #define FIB_RES_SADDR(res) (FIB_RES_NH(res).nh_saddr)
145 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
146 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
147 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
149 #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : FIB_RES_SADDR(res))
152 struct hlist_node tb_hlist;
155 unsigned char tb_data[0];
158 extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
159 struct fib_result *res, int fib_flags);
160 extern int fib_table_insert(struct fib_table *, struct fib_config *);
161 extern int fib_table_delete(struct fib_table *, struct fib_config *);
162 extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
163 struct netlink_callback *cb);
164 extern int fib_table_flush(struct fib_table *table);
165 extern void fib_free_table(struct fib_table *tb);
169 #ifndef CONFIG_IP_MULTIPLE_TABLES
171 #define TABLE_LOCAL_INDEX 0
172 #define TABLE_MAIN_INDEX 1
174 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
176 struct hlist_head *ptr;
178 ptr = id == RT_TABLE_LOCAL ?
179 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
180 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
181 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
184 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
186 return fib_get_table(net, id);
189 static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
190 struct fib_result *res)
192 struct fib_table *table;
194 table = fib_get_table(net, RT_TABLE_LOCAL);
195 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
198 table = fib_get_table(net, RT_TABLE_MAIN);
199 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
204 #else /* CONFIG_IP_MULTIPLE_TABLES */
205 extern int __net_init fib4_rules_init(struct net *net);
206 extern void __net_exit fib4_rules_exit(struct net *net);
208 #ifdef CONFIG_IP_ROUTE_CLASSID
209 extern u32 fib_rules_tclass(const struct fib_result *res);
212 extern int fib_lookup(struct net *n, struct flowi4 *flp, struct fib_result *res);
214 extern struct fib_table *fib_new_table(struct net *net, u32 id);
215 extern struct fib_table *fib_get_table(struct net *net, u32 id);
217 #endif /* CONFIG_IP_MULTIPLE_TABLES */
219 /* Exported by fib_frontend.c */
220 extern const struct nla_policy rtm_ipv4_policy[];
221 extern void ip_fib_init(void);
222 extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
223 struct net_device *dev, __be32 *spec_dst,
224 u32 *itag, u32 mark);
225 extern void fib_select_default(struct fib_result *res);
227 /* Exported by fib_semantics.c */
228 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
229 extern int fib_sync_down_dev(struct net_device *dev, int force);
230 extern int fib_sync_down_addr(struct net *net, __be32 local);
231 extern void fib_update_nh_saddrs(struct net_device *dev);
232 extern int fib_sync_up(struct net_device *dev);
233 extern void fib_select_multipath(struct fib_result *res);
235 /* Exported by fib_trie.c */
236 extern void fib_trie_init(void);
237 extern struct fib_table *fib_trie_table(u32 id);
239 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
241 #ifdef CONFIG_IP_ROUTE_CLASSID
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 #ifdef CONFIG_PROC_FS
264 extern int __net_init fib_proc_init(struct net *net);
265 extern void __net_exit fib_proc_exit(struct net *net);
267 static inline int fib_proc_init(struct net *net)
271 static inline void fib_proc_exit(struct net *net)
276 #endif /* _NET_FIB_H */