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;
80 u32 fib_metrics[RTAX_MAX];
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
100 unsigned char prefixlen;
101 unsigned char nh_sel;
105 #ifdef CONFIG_IP_MULTIPLE_TABLES
110 struct fib_result_nl {
111 __be32 fl_addr; /* To be looked up*/
113 unsigned char fl_tos;
114 unsigned char fl_scope;
115 unsigned char tb_id_in;
117 unsigned char tb_id; /* Results */
118 unsigned char prefixlen;
119 unsigned char nh_sel;
125 #ifdef CONFIG_IP_ROUTE_MULTIPATH
127 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
129 #define FIB_TABLE_HASHSZ 2
131 #else /* CONFIG_IP_ROUTE_MULTIPATH */
133 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
135 #define FIB_TABLE_HASHSZ 256
137 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
139 #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
140 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
141 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
142 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
145 struct hlist_node tb_hlist;
148 unsigned char tb_data[0];
151 extern int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
152 struct fib_result *res, int fib_flags);
153 extern int fib_table_insert(struct fib_table *, struct fib_config *);
154 extern int fib_table_delete(struct fib_table *, struct fib_config *);
155 extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
156 struct netlink_callback *cb);
157 extern int fib_table_flush(struct fib_table *table);
158 extern void fib_table_select_default(struct fib_table *table,
159 const struct flowi *flp,
160 struct fib_result *res);
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 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
174 &net->ipv4.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(struct net *net, const struct flowi *flp,
184 struct fib_result *res)
186 struct fib_table *table;
188 table = fib_get_table(net, RT_TABLE_LOCAL);
189 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
192 table = fib_get_table(net, RT_TABLE_MAIN);
193 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
198 #else /* CONFIG_IP_MULTIPLE_TABLES */
199 extern int __net_init fib4_rules_init(struct net *net);
200 extern void __net_exit fib4_rules_exit(struct net *net);
202 #ifdef CONFIG_NET_CLS_ROUTE
203 extern u32 fib_rules_tclass(struct fib_result *res);
206 extern int fib_lookup(struct net *n, struct flowi *flp, struct fib_result *res);
208 extern struct fib_table *fib_new_table(struct net *net, u32 id);
209 extern struct fib_table *fib_get_table(struct net *net, u32 id);
211 #endif /* CONFIG_IP_MULTIPLE_TABLES */
213 /* Exported by fib_frontend.c */
214 extern const struct nla_policy rtm_ipv4_policy[];
215 extern void ip_fib_init(void);
216 extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
217 struct net_device *dev, __be32 *spec_dst,
218 u32 *itag, u32 mark);
219 extern void fib_select_default(struct net *net, const struct flowi *flp,
220 struct fib_result *res);
222 /* Exported by fib_semantics.c */
223 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
224 extern int fib_sync_down_dev(struct net_device *dev, int force);
225 extern int fib_sync_down_addr(struct net *net, __be32 local);
226 extern int fib_sync_up(struct net_device *dev);
227 extern __be32 __fib_res_prefsrc(struct fib_result *res);
228 extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
230 /* Exported by fib_{hash|trie}.c */
231 extern void fib_hash_init(void);
232 extern struct fib_table *fib_hash_table(u32 id);
234 static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
236 #ifdef CONFIG_NET_CLS_ROUTE
237 #ifdef CONFIG_IP_MULTIPLE_TABLES
240 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
241 #ifdef CONFIG_IP_MULTIPLE_TABLES
242 rtag = fib_rules_tclass(res);
250 extern void free_fib_info(struct fib_info *fi);
252 static inline void fib_info_put(struct fib_info *fi)
254 if (atomic_dec_and_test(&fi->fib_clntref))
258 #ifdef CONFIG_PROC_FS
259 extern int __net_init fib_proc_init(struct net *net);
260 extern void __net_exit fib_proc_exit(struct net *net);
262 static inline int fib_proc_init(struct net *net)
266 static inline void fib_proc_exit(struct net *net)
271 #endif /* _NET_FIB_H */