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_IP_ROUTE_CLASSID
66 * This structure contains data shared by many of routes.
70 struct hlist_node fib_hash;
71 struct hlist_node fib_lhash;
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
101 unsigned char prefixlen;
102 unsigned char nh_sel;
106 struct fib_table *table;
107 struct list_head *fa_head;
108 #ifdef CONFIG_IP_MULTIPLE_TABLES
113 struct fib_result_nl {
114 __be32 fl_addr; /* To be looked up*/
116 unsigned char fl_tos;
117 unsigned char fl_scope;
118 unsigned char tb_id_in;
120 unsigned char tb_id; /* Results */
121 unsigned char prefixlen;
122 unsigned char nh_sel;
128 #ifdef CONFIG_IP_ROUTE_MULTIPATH
130 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
132 #define FIB_TABLE_HASHSZ 2
134 #else /* CONFIG_IP_ROUTE_MULTIPATH */
136 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
138 #define FIB_TABLE_HASHSZ 256
140 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
142 #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
143 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
144 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
145 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
148 struct hlist_node tb_hlist;
151 unsigned char tb_data[0];
154 extern int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
155 struct fib_result *res, int fib_flags);
156 extern int fib_table_insert(struct fib_table *, struct fib_config *);
157 extern int fib_table_delete(struct fib_table *, struct fib_config *);
158 extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
159 struct netlink_callback *cb);
160 extern int fib_table_flush(struct fib_table *table);
161 extern void fib_free_table(struct fib_table *tb);
165 #ifndef CONFIG_IP_MULTIPLE_TABLES
167 #define TABLE_LOCAL_INDEX 0
168 #define TABLE_MAIN_INDEX 1
170 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
172 struct hlist_head *ptr;
174 ptr = id == RT_TABLE_LOCAL ?
175 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
176 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
177 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
180 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
182 return fib_get_table(net, id);
185 static inline int fib_lookup(struct net *net, const struct flowi *flp,
186 struct fib_result *res)
188 struct fib_table *table;
190 table = fib_get_table(net, RT_TABLE_LOCAL);
191 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
194 table = fib_get_table(net, RT_TABLE_MAIN);
195 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
200 #else /* CONFIG_IP_MULTIPLE_TABLES */
201 extern int __net_init fib4_rules_init(struct net *net);
202 extern void __net_exit fib4_rules_exit(struct net *net);
204 #ifdef CONFIG_IP_ROUTE_CLASSID
205 extern u32 fib_rules_tclass(struct fib_result *res);
208 extern int fib_lookup(struct net *n, struct flowi *flp, struct fib_result *res);
210 extern struct fib_table *fib_new_table(struct net *net, u32 id);
211 extern struct fib_table *fib_get_table(struct net *net, u32 id);
213 #endif /* CONFIG_IP_MULTIPLE_TABLES */
215 /* Exported by fib_frontend.c */
216 extern const struct nla_policy rtm_ipv4_policy[];
217 extern void ip_fib_init(void);
218 extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
219 struct net_device *dev, __be32 *spec_dst,
220 u32 *itag, u32 mark);
221 extern void fib_select_default(struct fib_result *res);
223 /* Exported by fib_semantics.c */
224 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
225 extern int fib_sync_down_dev(struct net_device *dev, int force);
226 extern int fib_sync_down_addr(struct net *net, __be32 local);
227 extern int fib_sync_up(struct net_device *dev);
228 extern __be32 __fib_res_prefsrc(struct fib_result *res);
229 extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
231 /* Exported by fib_trie.c */
232 extern void fib_trie_init(void);
233 extern struct fib_table *fib_trie_table(u32 id);
235 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
237 #ifdef CONFIG_IP_ROUTE_CLASSID
238 #ifdef CONFIG_IP_MULTIPLE_TABLES
241 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
242 #ifdef CONFIG_IP_MULTIPLE_TABLES
243 rtag = fib_rules_tclass(res);
251 extern void free_fib_info(struct fib_info *fi);
253 static inline void fib_info_put(struct fib_info *fi)
255 if (atomic_dec_and_test(&fi->fib_clntref))
259 #ifdef CONFIG_PROC_FS
260 extern int __net_init fib_proc_init(struct net *net);
261 extern void __net_exit fib_proc_exit(struct net *net);
263 static inline int fib_proc_init(struct net *net)
267 static inline void fib_proc_exit(struct net *net)
272 #endif /* _NET_FIB_H */