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;
79 u32 fib_metrics[RTAX_MAX];
80 #define fib_mtu fib_metrics[RTAX_MTU-1]
81 #define fib_window fib_metrics[RTAX_WINDOW-1]
82 #define fib_rtt fib_metrics[RTAX_RTT-1]
83 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
85 #ifdef CONFIG_IP_ROUTE_MULTIPATH
88 struct fib_nh fib_nh[0];
89 #define fib_dev fib_nh[0].nh_dev
93 #ifdef CONFIG_IP_MULTIPLE_TABLES
98 unsigned char prefixlen;
103 #ifdef CONFIG_IP_MULTIPLE_TABLES
108 struct fib_result_nl {
109 __be32 fl_addr; /* To be looked up*/
111 unsigned char fl_tos;
112 unsigned char fl_scope;
113 unsigned char tb_id_in;
115 unsigned char tb_id; /* Results */
116 unsigned char prefixlen;
117 unsigned char nh_sel;
123 #ifdef CONFIG_IP_ROUTE_MULTIPATH
125 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
126 #define FIB_RES_RESET(res) ((res).nh_sel = 0)
128 #define FIB_TABLE_HASHSZ 2
130 #else /* CONFIG_IP_ROUTE_MULTIPATH */
132 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
133 #define FIB_RES_RESET(res)
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;
149 int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res);
150 int (*tb_insert)(struct fib_table *, struct fib_config *);
151 int (*tb_delete)(struct fib_table *, struct fib_config *);
152 int (*tb_dump)(struct fib_table *table, struct sk_buff *skb,
153 struct netlink_callback *cb);
154 int (*tb_flush)(struct fib_table *table);
155 void (*tb_select_default)(struct fib_table *table,
156 const struct flowi *flp, struct fib_result *res);
158 unsigned char tb_data[0];
161 #ifndef CONFIG_IP_MULTIPLE_TABLES
163 #define TABLE_LOCAL_INDEX 0
164 #define TABLE_MAIN_INDEX 1
166 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
168 struct hlist_head *ptr;
170 ptr = id == RT_TABLE_LOCAL ?
171 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
172 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
173 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
176 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
178 return fib_get_table(net, id);
181 static inline int fib_lookup(struct net *net, const struct flowi *flp,
182 struct fib_result *res)
184 struct fib_table *table;
186 table = fib_get_table(net, RT_TABLE_LOCAL);
187 if (!table->tb_lookup(table, flp, res))
190 table = fib_get_table(net, RT_TABLE_MAIN);
191 if (!table->tb_lookup(table, flp, res))
196 static inline void fib_select_default(const struct flowi *flp,
197 struct fib_result *res)
199 struct fib_table *table = fib_get_table(&init_net, RT_TABLE_MAIN);
200 if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
201 table->tb_select_default(table, flp, res);
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_NET_CLS_ROUTE
209 extern u32 fib_rules_tclass(struct fib_result *res);
212 extern int fib_lookup(struct net *n, struct flowi *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);
216 extern void fib_select_default(const struct flowi *flp, struct fib_result *res);
218 #endif /* CONFIG_IP_MULTIPLE_TABLES */
220 /* Exported by fib_frontend.c */
221 extern const struct nla_policy rtm_ipv4_policy[];
222 extern void ip_fib_init(void);
223 extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
224 struct net_device *dev, __be32 *spec_dst, u32 *itag);
225 extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
229 /* Exported by fib_semantics.c */
230 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
231 extern int fib_sync_down(__be32 local, struct net_device *dev, int force);
232 extern int fib_sync_up(struct net_device *dev);
233 extern __be32 __fib_res_prefsrc(struct fib_result *res);
235 /* Exported by fib_{hash|trie}.c */
236 extern void fib_hash_init(void);
237 extern struct fib_table *fib_hash_table(u32 id);
239 static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
241 #ifdef CONFIG_NET_CLS_ROUTE
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 static inline void fib_res_put(struct fib_result *res)
266 fib_info_put(res->fi);
267 #ifdef CONFIG_IP_MULTIPLE_TABLES
269 fib_rule_put(res->r);
273 #ifdef CONFIG_PROC_FS
274 extern int __net_init fib_proc_init(struct net *net);
275 extern void __net_exit fib_proc_exit(struct net *net);
278 #endif /* _NET_FIB_H */