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
67 * This structure contains data shared by many of routes.
71 struct hlist_node fib_hash;
72 struct hlist_node fib_lhash;
82 #define fib_mtu fib_metrics[RTAX_MTU-1]
83 #define fib_window fib_metrics[RTAX_WINDOW-1]
84 #define fib_rtt fib_metrics[RTAX_RTT-1]
85 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
87 #ifdef CONFIG_IP_ROUTE_MULTIPATH
91 struct fib_nh fib_nh[0];
92 #define fib_dev fib_nh[0].nh_dev
96 #ifdef CONFIG_IP_MULTIPLE_TABLES
102 unsigned char prefixlen;
103 unsigned char nh_sel;
107 struct fib_table *table;
108 struct list_head *fa_head;
109 #ifdef CONFIG_IP_MULTIPLE_TABLES
114 struct fib_result_nl {
115 __be32 fl_addr; /* To be looked up*/
117 unsigned char fl_tos;
118 unsigned char fl_scope;
119 unsigned char tb_id_in;
121 unsigned char tb_id; /* Results */
122 unsigned char prefixlen;
123 unsigned char nh_sel;
129 #ifdef CONFIG_IP_ROUTE_MULTIPATH
131 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
133 #define FIB_TABLE_HASHSZ 2
135 #else /* CONFIG_IP_ROUTE_MULTIPATH */
137 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
139 #define FIB_TABLE_HASHSZ 256
141 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
143 #define FIB_RES_SADDR(res) (FIB_RES_NH(res).nh_saddr)
144 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
145 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
146 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
148 #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : FIB_RES_SADDR(res))
151 struct hlist_node tb_hlist;
154 unsigned char tb_data[0];
157 extern int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
158 struct fib_result *res, int fib_flags);
159 extern int fib_table_insert(struct fib_table *, struct fib_config *);
160 extern int fib_table_delete(struct fib_table *, struct fib_config *);
161 extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
162 struct netlink_callback *cb);
163 extern int fib_table_flush(struct fib_table *table);
164 extern void fib_free_table(struct fib_table *tb);
168 #ifndef CONFIG_IP_MULTIPLE_TABLES
170 #define TABLE_LOCAL_INDEX 0
171 #define TABLE_MAIN_INDEX 1
173 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
175 struct hlist_head *ptr;
177 ptr = id == RT_TABLE_LOCAL ?
178 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
179 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
180 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
183 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
185 return fib_get_table(net, id);
188 static inline int fib_lookup(struct net *net, const struct flowi *flp,
189 struct fib_result *res)
191 struct fib_table *table;
193 table = fib_get_table(net, RT_TABLE_LOCAL);
194 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
197 table = fib_get_table(net, RT_TABLE_MAIN);
198 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
203 #else /* CONFIG_IP_MULTIPLE_TABLES */
204 extern int __net_init fib4_rules_init(struct net *net);
205 extern void __net_exit fib4_rules_exit(struct net *net);
207 #ifdef CONFIG_IP_ROUTE_CLASSID
208 extern u32 fib_rules_tclass(const struct fib_result *res);
211 extern int fib_lookup(struct net *n, struct flowi *flp, struct fib_result *res);
213 extern struct fib_table *fib_new_table(struct net *net, u32 id);
214 extern struct fib_table *fib_get_table(struct net *net, u32 id);
216 #endif /* CONFIG_IP_MULTIPLE_TABLES */
218 /* Exported by fib_frontend.c */
219 extern const struct nla_policy rtm_ipv4_policy[];
220 extern void ip_fib_init(void);
221 extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
222 struct net_device *dev, __be32 *spec_dst,
223 u32 *itag, u32 mark);
224 extern void fib_select_default(struct fib_result *res);
226 /* Exported by fib_semantics.c */
227 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
228 extern int fib_sync_down_dev(struct net_device *dev, int force);
229 extern int fib_sync_down_addr(struct net *net, __be32 local);
230 extern void fib_update_nh_saddrs(struct net_device *dev);
231 extern int fib_sync_up(struct net_device *dev);
232 extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
234 /* Exported by fib_trie.c */
235 extern void fib_trie_init(void);
236 extern struct fib_table *fib_trie_table(u32 id);
238 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
240 #ifdef CONFIG_IP_ROUTE_CLASSID
241 #ifdef CONFIG_IP_MULTIPLE_TABLES
244 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
245 #ifdef CONFIG_IP_MULTIPLE_TABLES
246 rtag = fib_rules_tclass(res);
254 extern void free_fib_info(struct fib_info *fi);
256 static inline void fib_info_put(struct fib_info *fi)
258 if (atomic_dec_and_test(&fi->fib_clntref))
262 #ifdef CONFIG_PROC_FS
263 extern int __net_init fib_proc_init(struct net *net);
264 extern void __net_exit fib_proc_exit(struct net *net);
266 static inline int fib_proc_init(struct net *net)
270 static inline void fib_proc_exit(struct net *net)
275 #endif /* _NET_FIB_H */