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>
22 /* WARNING: The ordering of these elements must match ordering
23 * of RTA_* rtnetlink attribute numbers.
33 struct rtattr *rta_mx;
34 struct rtattr *rta_mp;
35 unsigned char *rta_protoinfo;
37 struct rta_cacheinfo *rta_ci;
38 struct rta_session *rta_sess;
45 struct net_device *nh_dev;
46 struct hlist_node nh_hash;
47 struct fib_info *nh_parent;
49 unsigned char nh_scope;
50 #ifdef CONFIG_IP_ROUTE_MULTIPATH
54 #ifdef CONFIG_NET_CLS_ROUTE
62 * This structure contains data shared by many of routes.
66 struct hlist_node fib_hash;
67 struct hlist_node fib_lhash;
75 u32 fib_metrics[RTAX_MAX];
76 #define fib_mtu fib_metrics[RTAX_MTU-1]
77 #define fib_window fib_metrics[RTAX_WINDOW-1]
78 #define fib_rtt fib_metrics[RTAX_RTT-1]
79 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
81 #ifdef CONFIG_IP_ROUTE_MULTIPATH
84 #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
87 struct fib_nh fib_nh[0];
88 #define fib_dev fib_nh[0].nh_dev
92 #ifdef CONFIG_IP_MULTIPLE_TABLES
97 unsigned char prefixlen;
101 #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
106 #ifdef CONFIG_IP_MULTIPLE_TABLES
111 struct fib_result_nl {
112 u32 fl_addr; /* To be looked up*/
114 unsigned char fl_tos;
115 unsigned char fl_scope;
116 unsigned char tb_id_in;
118 unsigned char tb_id; /* Results */
119 unsigned char prefixlen;
120 unsigned char nh_sel;
126 #ifdef CONFIG_IP_ROUTE_MULTIPATH
128 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
129 #define FIB_RES_RESET(res) ((res).nh_sel = 0)
131 #else /* CONFIG_IP_ROUTE_MULTIPATH */
133 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
134 #define FIB_RES_RESET(res)
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)
143 #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
144 #define FIB_RES_NETWORK(res) ((res).network)
145 #define FIB_RES_NETMASK(res) ((res).netmask)
146 #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
147 #define FIB_RES_NETWORK(res) (0)
148 #define FIB_RES_NETMASK(res) (0)
149 #endif /* CONFIG_IP_ROUTE_MULTIPATH_WRANDOM */
154 int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res);
155 int (*tb_insert)(struct fib_table *table, struct rtmsg *r,
156 struct kern_rta *rta, struct nlmsghdr *n,
157 struct netlink_skb_parms *req);
158 int (*tb_delete)(struct fib_table *table, struct rtmsg *r,
159 struct kern_rta *rta, struct nlmsghdr *n,
160 struct netlink_skb_parms *req);
161 int (*tb_dump)(struct fib_table *table, struct sk_buff *skb,
162 struct netlink_callback *cb);
163 int (*tb_flush)(struct fib_table *table);
164 void (*tb_select_default)(struct fib_table *table,
165 const struct flowi *flp, struct fib_result *res);
167 unsigned char tb_data[0];
170 #ifndef CONFIG_IP_MULTIPLE_TABLES
172 extern struct fib_table *ip_fib_local_table;
173 extern struct fib_table *ip_fib_main_table;
175 static inline struct fib_table *fib_get_table(int id)
177 if (id != RT_TABLE_LOCAL)
178 return ip_fib_main_table;
179 return ip_fib_local_table;
182 static inline struct fib_table *fib_new_table(int id)
184 return fib_get_table(id);
187 static inline int fib_lookup(const struct flowi *flp, struct fib_result *res)
189 if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) &&
190 ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res))
195 static inline void fib_select_default(const struct flowi *flp, struct fib_result *res)
197 if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
198 ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);
201 #else /* CONFIG_IP_MULTIPLE_TABLES */
202 #define ip_fib_local_table (fib_tables[RT_TABLE_LOCAL])
203 #define ip_fib_main_table (fib_tables[RT_TABLE_MAIN])
205 extern struct fib_table * fib_tables[RT_TABLE_MAX+1];
206 extern int fib_lookup(const struct flowi *flp, struct fib_result *res);
207 extern struct fib_table *__fib_new_table(int id);
208 extern void fib_rule_put(struct fib_rule *r);
210 static inline struct fib_table *fib_get_table(int id)
215 return fib_tables[id];
218 static inline struct fib_table *fib_new_table(int id)
223 return fib_tables[id] ? : __fib_new_table(id);
226 extern void fib_select_default(const struct flowi *flp, struct fib_result *res);
228 #endif /* CONFIG_IP_MULTIPLE_TABLES */
230 /* Exported by fib_frontend.c */
231 extern void ip_fib_init(void);
232 extern int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
233 extern int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
234 extern int inet_rtm_getroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
235 extern int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb);
236 extern int fib_validate_source(u32 src, u32 dst, u8 tos, int oif,
237 struct net_device *dev, u32 *spec_dst, u32 *itag);
238 extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
242 /* Exported by fib_semantics.c */
243 extern int ip_fib_check_default(u32 gw, struct net_device *dev);
244 extern int fib_sync_down(u32 local, struct net_device *dev, int force);
245 extern int fib_sync_up(struct net_device *dev);
246 extern int fib_convert_rtentry(int cmd, struct nlmsghdr *nl, struct rtmsg *rtm,
247 struct kern_rta *rta, struct rtentry *r);
248 extern u32 __fib_res_prefsrc(struct fib_result *res);
250 /* Exported by fib_hash.c */
251 extern struct fib_table *fib_hash_init(int id);
253 #ifdef CONFIG_IP_MULTIPLE_TABLES
254 /* Exported by fib_rules.c */
256 extern int inet_rtm_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
257 extern int inet_rtm_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
258 extern int inet_dump_rules(struct sk_buff *skb, struct netlink_callback *cb);
259 #ifdef CONFIG_NET_CLS_ROUTE
260 extern u32 fib_rules_tclass(struct fib_result *res);
262 extern void fib_rules_init(void);
265 static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
267 #ifdef CONFIG_NET_CLS_ROUTE
268 #ifdef CONFIG_IP_MULTIPLE_TABLES
271 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
272 #ifdef CONFIG_IP_MULTIPLE_TABLES
273 rtag = fib_rules_tclass(res);
281 extern void free_fib_info(struct fib_info *fi);
283 static inline void fib_info_put(struct fib_info *fi)
285 if (atomic_dec_and_test(&fi->fib_clntref))
289 static inline void fib_res_put(struct fib_result *res)
292 fib_info_put(res->fi);
293 #ifdef CONFIG_IP_MULTIPLE_TABLES
295 fib_rule_put(res->r);
299 #ifdef CONFIG_PROC_FS
300 extern int fib_proc_init(void);
301 extern void fib_proc_exit(void);
304 #endif /* _NET_FIB_H */