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
89 struct fib_nh fib_nh[0];
90 #define fib_dev fib_nh[0].nh_dev
94 #ifdef CONFIG_IP_MULTIPLE_TABLES
99 unsigned char prefixlen;
100 unsigned char nh_sel;
104 #ifdef CONFIG_IP_MULTIPLE_TABLES
109 struct fib_result_nl {
110 __be32 fl_addr; /* To be looked up*/
112 unsigned char fl_tos;
113 unsigned char fl_scope;
114 unsigned char tb_id_in;
116 unsigned char tb_id; /* Results */
117 unsigned char prefixlen;
118 unsigned char nh_sel;
124 #ifdef CONFIG_IP_ROUTE_MULTIPATH
126 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
128 #define FIB_TABLE_HASHSZ 2
130 #else /* CONFIG_IP_ROUTE_MULTIPATH */
132 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
134 #define FIB_TABLE_HASHSZ 256
136 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
138 #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
139 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
140 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
141 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
144 struct hlist_node tb_hlist;
147 int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res);
148 int (*tb_insert)(struct fib_table *, struct fib_config *);
149 int (*tb_delete)(struct fib_table *, struct fib_config *);
150 int (*tb_dump)(struct fib_table *table, struct sk_buff *skb,
151 struct netlink_callback *cb);
152 int (*tb_flush)(struct fib_table *table);
153 void (*tb_select_default)(struct fib_table *table,
154 const struct flowi *flp, struct fib_result *res);
156 unsigned char tb_data[0];
159 #ifndef CONFIG_IP_MULTIPLE_TABLES
161 #define TABLE_LOCAL_INDEX 0
162 #define TABLE_MAIN_INDEX 1
164 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
166 struct hlist_head *ptr;
168 ptr = id == RT_TABLE_LOCAL ?
169 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
170 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
171 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
174 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
176 return fib_get_table(net, id);
179 static inline int fib_lookup(struct net *net, const struct flowi *flp,
180 struct fib_result *res)
182 struct fib_table *table;
184 table = fib_get_table(net, RT_TABLE_LOCAL);
185 if (!table->tb_lookup(table, flp, res))
188 table = fib_get_table(net, RT_TABLE_MAIN);
189 if (!table->tb_lookup(table, flp, res))
194 #else /* CONFIG_IP_MULTIPLE_TABLES */
195 extern int __net_init fib4_rules_init(struct net *net);
196 extern void __net_exit fib4_rules_exit(struct net *net);
198 #ifdef CONFIG_NET_CLS_ROUTE
199 extern u32 fib_rules_tclass(struct fib_result *res);
202 extern int fib_lookup(struct net *n, struct flowi *flp, struct fib_result *res);
204 extern struct fib_table *fib_new_table(struct net *net, u32 id);
205 extern struct fib_table *fib_get_table(struct net *net, u32 id);
207 #endif /* CONFIG_IP_MULTIPLE_TABLES */
209 /* Exported by fib_frontend.c */
210 extern const struct nla_policy rtm_ipv4_policy[];
211 extern void ip_fib_init(void);
212 extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
213 struct net_device *dev, __be32 *spec_dst, u32 *itag);
214 extern void fib_select_default(struct net *net, const struct flowi *flp,
215 struct fib_result *res);
217 /* Exported by fib_semantics.c */
218 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
219 extern int fib_sync_down_dev(struct net_device *dev, int force);
220 extern int fib_sync_down_addr(struct net *net, __be32 local);
221 extern int fib_sync_up(struct net_device *dev);
222 extern __be32 __fib_res_prefsrc(struct fib_result *res);
223 extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
225 /* Exported by fib_{hash|trie}.c */
226 extern void fib_hash_init(void);
227 extern struct fib_table *fib_hash_table(u32 id);
229 static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
231 #ifdef CONFIG_NET_CLS_ROUTE
232 #ifdef CONFIG_IP_MULTIPLE_TABLES
235 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
236 #ifdef CONFIG_IP_MULTIPLE_TABLES
237 rtag = fib_rules_tclass(res);
245 extern void free_fib_info(struct fib_info *fi);
247 static inline void fib_info_put(struct fib_info *fi)
249 if (atomic_dec_and_test(&fi->fib_clntref))
253 static inline void fib_res_put(struct fib_result *res)
256 fib_info_put(res->fi);
257 #ifdef CONFIG_IP_MULTIPLE_TABLES
259 fib_rule_put(res->r);
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 */