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>
41 struct rtnexthop *fc_mp;
47 struct nl_info fc_nlinfo;
53 struct net_device *nh_dev;
54 struct hlist_node nh_hash;
55 struct fib_info *nh_parent;
57 unsigned char nh_scope;
58 #ifdef CONFIG_IP_ROUTE_MULTIPATH
62 #ifdef CONFIG_NET_CLS_ROUTE
70 * This structure contains data shared by many of routes.
74 struct hlist_node fib_hash;
75 struct hlist_node fib_lhash;
83 u32 fib_metrics[RTAX_MAX];
84 #define fib_mtu fib_metrics[RTAX_MTU-1]
85 #define fib_window fib_metrics[RTAX_WINDOW-1]
86 #define fib_rtt fib_metrics[RTAX_RTT-1]
87 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
89 #ifdef CONFIG_IP_ROUTE_MULTIPATH
92 #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
95 struct fib_nh fib_nh[0];
96 #define fib_dev fib_nh[0].nh_dev
100 #ifdef CONFIG_IP_MULTIPLE_TABLES
105 unsigned char prefixlen;
106 unsigned char nh_sel;
109 #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
114 #ifdef CONFIG_IP_MULTIPLE_TABLES
119 struct fib_result_nl {
120 u32 fl_addr; /* To be looked up*/
122 unsigned char fl_tos;
123 unsigned char fl_scope;
124 unsigned char tb_id_in;
126 unsigned char tb_id; /* Results */
127 unsigned char prefixlen;
128 unsigned char nh_sel;
134 #ifdef CONFIG_IP_ROUTE_MULTIPATH
136 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
137 #define FIB_RES_RESET(res) ((res).nh_sel = 0)
139 #else /* CONFIG_IP_ROUTE_MULTIPATH */
141 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
142 #define FIB_RES_RESET(res)
144 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
146 #define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
147 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
148 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
149 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
151 #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
152 #define FIB_RES_NETWORK(res) ((res).network)
153 #define FIB_RES_NETMASK(res) ((res).netmask)
154 #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
155 #define FIB_RES_NETWORK(res) (0)
156 #define FIB_RES_NETMASK(res) (0)
157 #endif /* CONFIG_IP_ROUTE_MULTIPATH_WRANDOM */
160 struct hlist_node tb_hlist;
163 int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res);
164 int (*tb_insert)(struct fib_table *, struct fib_config *);
165 int (*tb_delete)(struct fib_table *, struct fib_config *);
166 int (*tb_dump)(struct fib_table *table, struct sk_buff *skb,
167 struct netlink_callback *cb);
168 int (*tb_flush)(struct fib_table *table);
169 void (*tb_select_default)(struct fib_table *table,
170 const struct flowi *flp, struct fib_result *res);
172 unsigned char tb_data[0];
175 #ifndef CONFIG_IP_MULTIPLE_TABLES
177 extern struct fib_table *ip_fib_local_table;
178 extern struct fib_table *ip_fib_main_table;
180 static inline struct fib_table *fib_get_table(u32 id)
182 if (id != RT_TABLE_LOCAL)
183 return ip_fib_main_table;
184 return ip_fib_local_table;
187 static inline struct fib_table *fib_new_table(u32 id)
189 return fib_get_table(id);
192 static inline int fib_lookup(const struct flowi *flp, struct fib_result *res)
194 if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) &&
195 ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res))
200 static inline void fib_select_default(const struct flowi *flp, struct fib_result *res)
202 if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
203 ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);
206 #else /* CONFIG_IP_MULTIPLE_TABLES */
207 #define ip_fib_local_table fib_get_table(RT_TABLE_LOCAL)
208 #define ip_fib_main_table fib_get_table(RT_TABLE_MAIN)
210 extern int fib_lookup(struct flowi *flp, struct fib_result *res);
212 extern struct fib_table *fib_new_table(u32 id);
213 extern struct fib_table *fib_get_table(u32 id);
214 extern void fib_select_default(const struct flowi *flp, struct fib_result *res);
216 #endif /* CONFIG_IP_MULTIPLE_TABLES */
218 /* Exported by fib_frontend.c */
219 extern struct nla_policy rtm_ipv4_policy[];
220 extern void ip_fib_init(void);
221 extern int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
222 extern int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
223 extern int inet_rtm_getroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
224 extern int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb);
225 extern int fib_validate_source(u32 src, u32 dst, u8 tos, int oif,
226 struct net_device *dev, u32 *spec_dst, u32 *itag);
227 extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
231 /* Exported by fib_semantics.c */
232 extern int ip_fib_check_default(u32 gw, struct net_device *dev);
233 extern int fib_sync_down(u32 local, struct net_device *dev, int force);
234 extern int fib_sync_up(struct net_device *dev);
235 extern u32 __fib_res_prefsrc(struct fib_result *res);
237 /* Exported by fib_hash.c */
238 extern struct fib_table *fib_hash_init(u32 id);
240 #ifdef CONFIG_IP_MULTIPLE_TABLES
241 extern int fib4_rules_dump(struct sk_buff *skb, struct netlink_callback *cb);
243 extern void __init fib4_rules_init(void);
245 #ifdef CONFIG_NET_CLS_ROUTE
246 extern u32 fib_rules_tclass(struct fib_result *res);
251 static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
253 #ifdef CONFIG_NET_CLS_ROUTE
254 #ifdef CONFIG_IP_MULTIPLE_TABLES
257 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
258 #ifdef CONFIG_IP_MULTIPLE_TABLES
259 rtag = fib_rules_tclass(res);
267 extern void free_fib_info(struct fib_info *fi);
269 static inline void fib_info_put(struct fib_info *fi)
271 if (atomic_dec_and_test(&fi->fib_clntref))
275 static inline void fib_res_put(struct fib_result *res)
278 fib_info_put(res->fi);
279 #ifdef CONFIG_IP_MULTIPLE_TABLES
281 fib_rule_put(res->r);
285 #ifdef CONFIG_PROC_FS
286 extern int fib_proc_init(void);
287 extern void fib_proc_exit(void);
290 #endif /* _NET_FIB_H */