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>
22 #include <net/inetpeer.h>
39 struct rtnexthop *fc_mp;
44 struct nl_info fc_nlinfo;
50 struct net_device *nh_dev;
51 struct hlist_node nh_hash;
52 struct fib_info *nh_parent;
53 unsigned int nh_flags;
54 unsigned char nh_scope;
55 #ifdef CONFIG_IP_ROUTE_MULTIPATH
59 #ifdef CONFIG_IP_ROUTE_CLASSID
69 * This structure contains data shared by many of routes.
73 struct hlist_node fib_hash;
74 struct hlist_node fib_lhash;
78 unsigned int fib_flags;
79 unsigned char fib_dead;
80 unsigned char fib_protocol;
81 unsigned char fib_scope;
85 #define fib_mtu fib_metrics[RTAX_MTU-1]
86 #define fib_window fib_metrics[RTAX_WINDOW-1]
87 #define fib_rtt fib_metrics[RTAX_RTT-1]
88 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
90 #ifdef CONFIG_IP_ROUTE_MULTIPATH
94 struct fib_nh fib_nh[0];
95 #define fib_dev fib_nh[0].nh_dev
99 #ifdef CONFIG_IP_MULTIPLE_TABLES
105 unsigned char prefixlen;
106 unsigned char nh_sel;
111 struct fib_table *table;
112 struct list_head *fa_head;
115 struct fib_result_nl {
116 __be32 fl_addr; /* To be looked up*/
118 unsigned char fl_tos;
119 unsigned char fl_scope;
120 unsigned char tb_id_in;
122 unsigned char tb_id; /* Results */
123 unsigned char prefixlen;
124 unsigned char nh_sel;
130 #ifdef CONFIG_IP_ROUTE_MULTIPATH
132 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
134 #define FIB_TABLE_HASHSZ 2
136 #else /* CONFIG_IP_ROUTE_MULTIPATH */
138 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
140 #define FIB_TABLE_HASHSZ 256
142 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
144 extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
146 #define FIB_RES_SADDR(net, res) \
147 ((FIB_RES_NH(res).nh_saddr_genid == \
148 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
149 FIB_RES_NH(res).nh_saddr : \
150 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
151 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
152 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
153 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
155 #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
156 FIB_RES_SADDR(net, res))
159 struct hlist_node tb_hlist;
163 unsigned long tb_data[0];
166 extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
167 struct fib_result *res, int fib_flags);
168 extern int fib_table_insert(struct fib_table *, struct fib_config *);
169 extern int fib_table_delete(struct fib_table *, struct fib_config *);
170 extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
171 struct netlink_callback *cb);
172 extern int fib_table_flush(struct fib_table *table);
173 extern void fib_free_table(struct fib_table *tb);
177 #ifndef CONFIG_IP_MULTIPLE_TABLES
179 #define TABLE_LOCAL_INDEX 0
180 #define TABLE_MAIN_INDEX 1
182 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
184 struct hlist_head *ptr;
186 ptr = id == RT_TABLE_LOCAL ?
187 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
188 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
189 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
192 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
194 return fib_get_table(net, id);
197 static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
198 struct fib_result *res)
200 struct fib_table *table;
202 table = fib_get_table(net, RT_TABLE_LOCAL);
203 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
206 table = fib_get_table(net, RT_TABLE_MAIN);
207 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
212 #else /* CONFIG_IP_MULTIPLE_TABLES */
213 extern int __net_init fib4_rules_init(struct net *net);
214 extern void __net_exit fib4_rules_exit(struct net *net);
216 extern struct fib_table *fib_new_table(struct net *net, u32 id);
217 extern struct fib_table *fib_get_table(struct net *net, u32 id);
219 extern int __fib_lookup(struct net *net, struct flowi4 *flp,
220 struct fib_result *res);
222 static inline int fib_lookup(struct net *net, struct flowi4 *flp,
223 struct fib_result *res)
225 if (!net->ipv4.fib_has_custom_rules) {
227 if (net->ipv4.fib_local &&
228 !fib_table_lookup(net->ipv4.fib_local, flp, res,
231 if (net->ipv4.fib_main &&
232 !fib_table_lookup(net->ipv4.fib_main, flp, res,
235 if (net->ipv4.fib_default &&
236 !fib_table_lookup(net->ipv4.fib_default, flp, res,
241 return __fib_lookup(net, flp, res);
244 #endif /* CONFIG_IP_MULTIPLE_TABLES */
246 /* Exported by fib_frontend.c */
247 extern const struct nla_policy rtm_ipv4_policy[];
248 extern void ip_fib_init(void);
249 extern __be32 fib_compute_spec_dst(struct sk_buff *skb);
250 extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
251 u8 tos, int oif, struct net_device *dev,
252 struct in_device *idev, u32 *itag);
253 extern void fib_select_default(struct fib_result *res);
254 #ifdef CONFIG_IP_ROUTE_CLASSID
255 static inline int fib_num_tclassid_users(struct net *net)
257 return net->ipv4.fib_num_tclassid_users;
260 static inline int fib_num_tclassid_users(struct net *net)
266 /* Exported by fib_semantics.c */
267 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
268 extern int fib_sync_down_dev(struct net_device *dev, int force);
269 extern int fib_sync_down_addr(struct net *net, __be32 local);
270 extern void fib_update_nh_saddrs(struct net_device *dev);
271 extern int fib_sync_up(struct net_device *dev);
272 extern void fib_select_multipath(struct fib_result *res);
274 /* Exported by fib_trie.c */
275 extern void fib_trie_init(void);
276 extern struct fib_table *fib_trie_table(u32 id);
278 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
280 #ifdef CONFIG_IP_ROUTE_CLASSID
281 #ifdef CONFIG_IP_MULTIPLE_TABLES
284 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
285 #ifdef CONFIG_IP_MULTIPLE_TABLES
286 rtag = res->tclassid;
294 extern void free_fib_info(struct fib_info *fi);
296 static inline void fib_info_put(struct fib_info *fi)
298 if (atomic_dec_and_test(&fi->fib_clntref))
302 #ifdef CONFIG_PROC_FS
303 extern int __net_init fib_proc_init(struct net *net);
304 extern void __net_exit fib_proc_exit(struct net *net);
306 static inline int fib_proc_init(struct net *net)
310 static inline void fib_proc_exit(struct net *net)
315 #endif /* _NET_FIB_H */