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 #else /* CONFIG_IP_ROUTE_MULTIPATH */
130 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
131 #define FIB_RES_RESET(res)
133 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
135 #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
136 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
137 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
138 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
141 struct hlist_node tb_hlist;
145 int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res);
146 int (*tb_insert)(struct fib_table *, struct fib_config *);
147 int (*tb_delete)(struct fib_table *, struct fib_config *);
148 int (*tb_dump)(struct fib_table *table, struct sk_buff *skb,
149 struct netlink_callback *cb);
150 int (*tb_flush)(struct fib_table *table);
151 void (*tb_select_default)(struct fib_table *table,
152 const struct flowi *flp, struct fib_result *res);
154 unsigned char tb_data[0];
157 #ifndef CONFIG_IP_MULTIPLE_TABLES
159 extern struct fib_table *ip_fib_local_table;
160 extern struct fib_table *ip_fib_main_table;
162 static inline struct fib_table *fib_get_table(u32 id)
164 if (id != RT_TABLE_LOCAL)
165 return ip_fib_main_table;
166 return ip_fib_local_table;
169 static inline struct fib_table *fib_new_table(u32 id)
171 return fib_get_table(id);
174 static inline int fib_lookup(const struct flowi *flp, struct fib_result *res)
176 if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) &&
177 ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res))
182 static inline void fib_select_default(const struct flowi *flp, struct fib_result *res)
184 if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
185 ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);
188 #else /* CONFIG_IP_MULTIPLE_TABLES */
189 extern int __net_init fib4_rules_init(struct net *net);
190 extern void __net_exit fib4_rules_exit(struct net *net);
192 #ifdef CONFIG_NET_CLS_ROUTE
193 extern u32 fib_rules_tclass(struct fib_result *res);
196 extern int fib_lookup(struct flowi *flp, struct fib_result *res);
198 extern struct fib_table *fib_new_table(u32 id);
199 extern struct fib_table *fib_get_table(u32 id);
200 extern void fib_select_default(const struct flowi *flp, struct fib_result *res);
202 #endif /* CONFIG_IP_MULTIPLE_TABLES */
204 /* Exported by fib_frontend.c */
205 extern const struct nla_policy rtm_ipv4_policy[];
206 extern void ip_fib_init(void);
207 extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
208 struct net_device *dev, __be32 *spec_dst, u32 *itag);
209 extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
213 /* Exported by fib_semantics.c */
214 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
215 extern int fib_sync_down(__be32 local, struct net_device *dev, int force);
216 extern int fib_sync_up(struct net_device *dev);
217 extern __be32 __fib_res_prefsrc(struct fib_result *res);
219 /* Exported by fib_hash.c */
220 extern struct fib_table *fib_hash_init(u32 id);
222 static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
224 #ifdef CONFIG_NET_CLS_ROUTE
225 #ifdef CONFIG_IP_MULTIPLE_TABLES
228 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
229 #ifdef CONFIG_IP_MULTIPLE_TABLES
230 rtag = fib_rules_tclass(res);
238 extern void free_fib_info(struct fib_info *fi);
240 static inline void fib_info_put(struct fib_info *fi)
242 if (atomic_dec_and_test(&fi->fib_clntref))
246 static inline void fib_res_put(struct fib_result *res)
249 fib_info_put(res->fi);
250 #ifdef CONFIG_IP_MULTIPLE_TABLES
252 fib_rule_put(res->r);
256 #ifdef CONFIG_PROC_FS
257 extern int __net_init fib_proc_init(struct net *net);
258 extern void __net_exit fib_proc_exit(struct net *net);
261 #endif /* _NET_FIB_H */