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>
23 /* WARNING: The ordering of these elements must match ordering
24 * of RTA_* rtnetlink attribute numbers.
34 struct rtattr *rta_mx;
35 struct rtattr *rta_mp;
36 unsigned char *rta_protoinfo;
38 struct rta_cacheinfo *rta_ci;
39 struct rta_session *rta_sess;
46 struct net_device *nh_dev;
47 struct hlist_node nh_hash;
48 struct fib_info *nh_parent;
50 unsigned char nh_scope;
51 #ifdef CONFIG_IP_ROUTE_MULTIPATH
55 #ifdef CONFIG_NET_CLS_ROUTE
63 * This structure contains data shared by many of routes.
67 struct hlist_node fib_hash;
68 struct hlist_node fib_lhash;
76 u32 fib_metrics[RTAX_MAX];
77 #define fib_mtu fib_metrics[RTAX_MTU-1]
78 #define fib_window fib_metrics[RTAX_WINDOW-1]
79 #define fib_rtt fib_metrics[RTAX_RTT-1]
80 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
82 #ifdef CONFIG_IP_ROUTE_MULTIPATH
85 #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
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;
102 #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
107 #ifdef CONFIG_IP_MULTIPLE_TABLES
112 struct fib_result_nl {
113 u32 fl_addr; /* To be looked up*/
115 unsigned char fl_tos;
116 unsigned char fl_scope;
117 unsigned char tb_id_in;
119 unsigned char tb_id; /* Results */
120 unsigned char prefixlen;
121 unsigned char nh_sel;
127 #ifdef CONFIG_IP_ROUTE_MULTIPATH
129 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
130 #define FIB_RES_RESET(res) ((res).nh_sel = 0)
132 #else /* CONFIG_IP_ROUTE_MULTIPATH */
134 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
135 #define FIB_RES_RESET(res)
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)
144 #ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
145 #define FIB_RES_NETWORK(res) ((res).network)
146 #define FIB_RES_NETMASK(res) ((res).netmask)
147 #else /* CONFIG_IP_ROUTE_MULTIPATH_CACHED */
148 #define FIB_RES_NETWORK(res) (0)
149 #define FIB_RES_NETMASK(res) (0)
150 #endif /* CONFIG_IP_ROUTE_MULTIPATH_WRANDOM */
153 struct hlist_node tb_hlist;
156 int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res);
157 int (*tb_insert)(struct fib_table *table, struct rtmsg *r,
158 struct kern_rta *rta, struct nlmsghdr *n,
159 struct netlink_skb_parms *req);
160 int (*tb_delete)(struct fib_table *table, struct rtmsg *r,
161 struct kern_rta *rta, struct nlmsghdr *n,
162 struct netlink_skb_parms *req);
163 int (*tb_dump)(struct fib_table *table, struct sk_buff *skb,
164 struct netlink_callback *cb);
165 int (*tb_flush)(struct fib_table *table);
166 void (*tb_select_default)(struct fib_table *table,
167 const struct flowi *flp, struct fib_result *res);
169 unsigned char tb_data[0];
172 #ifndef CONFIG_IP_MULTIPLE_TABLES
174 extern struct fib_table *ip_fib_local_table;
175 extern struct fib_table *ip_fib_main_table;
177 static inline struct fib_table *fib_get_table(u32 id)
179 if (id != RT_TABLE_LOCAL)
180 return ip_fib_main_table;
181 return ip_fib_local_table;
184 static inline struct fib_table *fib_new_table(u32 id)
186 return fib_get_table(id);
189 static inline int fib_lookup(const struct flowi *flp, struct fib_result *res)
191 if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) &&
192 ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res))
197 static inline void fib_select_default(const struct flowi *flp, struct fib_result *res)
199 if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
200 ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);
203 #else /* CONFIG_IP_MULTIPLE_TABLES */
204 #define ip_fib_local_table fib_get_table(RT_TABLE_LOCAL)
205 #define ip_fib_main_table fib_get_table(RT_TABLE_MAIN)
207 extern int fib_lookup(struct flowi *flp, struct fib_result *res);
209 extern struct fib_table *fib_new_table(u32 id);
210 extern struct fib_table *fib_get_table(u32 id);
211 extern void fib_select_default(const struct flowi *flp, struct fib_result *res);
213 #endif /* CONFIG_IP_MULTIPLE_TABLES */
215 /* Exported by fib_frontend.c */
216 extern void ip_fib_init(void);
217 extern int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
218 extern int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
219 extern int inet_rtm_getroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
220 extern int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb);
221 extern int fib_validate_source(u32 src, u32 dst, u8 tos, int oif,
222 struct net_device *dev, u32 *spec_dst, u32 *itag);
223 extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
227 /* Exported by fib_semantics.c */
228 extern int ip_fib_check_default(u32 gw, struct net_device *dev);
229 extern int fib_sync_down(u32 local, struct net_device *dev, int force);
230 extern int fib_sync_up(struct net_device *dev);
231 extern int fib_convert_rtentry(int cmd, struct nlmsghdr *nl, struct rtmsg *rtm,
232 struct kern_rta *rta, struct rtentry *r);
233 extern u32 __fib_res_prefsrc(struct fib_result *res);
235 /* Exported by fib_hash.c */
236 extern struct fib_table *fib_hash_init(u32 id);
238 #ifdef CONFIG_IP_MULTIPLE_TABLES
239 extern int fib4_rules_dump(struct sk_buff *skb, struct netlink_callback *cb);
241 extern void __init fib4_rules_init(void);
243 #ifdef CONFIG_NET_CLS_ROUTE
244 extern u32 fib_rules_tclass(struct fib_result *res);
249 static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
251 #ifdef CONFIG_NET_CLS_ROUTE
252 #ifdef CONFIG_IP_MULTIPLE_TABLES
255 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
256 #ifdef CONFIG_IP_MULTIPLE_TABLES
257 rtag = fib_rules_tclass(res);
265 extern void free_fib_info(struct fib_info *fi);
267 static inline void fib_info_put(struct fib_info *fi)
269 if (atomic_dec_and_test(&fi->fib_clntref))
273 static inline void fib_res_put(struct fib_result *res)
276 fib_info_put(res->fi);
277 #ifdef CONFIG_IP_MULTIPLE_TABLES
279 fib_rule_put(res->r);
283 #ifdef CONFIG_PROC_FS
284 extern int fib_proc_init(void);
285 extern void fib_proc_exit(void);
288 #endif /* _NET_FIB_H */