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 <linux/rcupdate.h>
22 #include <net/fib_rules.h>
23 #include <net/inetpeer.h>
40 struct rtnexthop *fc_mp;
45 struct nl_info fc_nlinfo;
50 struct fib_nh_exception {
51 struct fib_nh_exception __rcu *fnhe_next;
55 unsigned long fnhe_expires;
56 unsigned long fnhe_stamp;
59 struct fnhe_hash_bucket {
60 struct fib_nh_exception __rcu *chain;
63 #define FNHE_HASH_SIZE 2048
64 #define FNHE_RECLAIM_DEPTH 5
67 struct net_device *nh_dev;
68 struct hlist_node nh_hash;
69 struct fib_info *nh_parent;
70 unsigned int nh_flags;
71 unsigned char nh_scope;
72 #ifdef CONFIG_IP_ROUTE_MULTIPATH
76 #ifdef CONFIG_IP_ROUTE_CLASSID
83 struct fnhe_hash_bucket *nh_exceptions;
87 * This structure contains data shared by many of routes.
91 struct hlist_node fib_hash;
92 struct hlist_node fib_lhash;
96 unsigned int fib_flags;
97 unsigned char fib_dead;
98 unsigned char fib_protocol;
99 unsigned char fib_scope;
103 #define fib_mtu fib_metrics[RTAX_MTU-1]
104 #define fib_window fib_metrics[RTAX_WINDOW-1]
105 #define fib_rtt fib_metrics[RTAX_RTT-1]
106 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
108 #ifdef CONFIG_IP_ROUTE_MULTIPATH
112 struct fib_nh fib_nh[0];
113 #define fib_dev fib_nh[0].nh_dev
117 #ifdef CONFIG_IP_MULTIPLE_TABLES
123 unsigned char prefixlen;
124 unsigned char nh_sel;
129 struct fib_table *table;
130 struct list_head *fa_head;
133 struct fib_result_nl {
134 __be32 fl_addr; /* To be looked up*/
136 unsigned char fl_tos;
137 unsigned char fl_scope;
138 unsigned char tb_id_in;
140 unsigned char tb_id; /* Results */
141 unsigned char prefixlen;
142 unsigned char nh_sel;
148 #ifdef CONFIG_IP_ROUTE_MULTIPATH
150 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
152 #define FIB_TABLE_HASHSZ 2
154 #else /* CONFIG_IP_ROUTE_MULTIPATH */
156 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
158 #define FIB_TABLE_HASHSZ 256
160 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
162 extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
164 #define FIB_RES_SADDR(net, res) \
165 ((FIB_RES_NH(res).nh_saddr_genid == \
166 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
167 FIB_RES_NH(res).nh_saddr : \
168 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
169 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
170 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
171 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
173 #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
174 FIB_RES_SADDR(net, res))
177 struct hlist_node tb_hlist;
181 unsigned long tb_data[0];
184 extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
185 struct fib_result *res, int fib_flags);
186 extern int fib_table_insert(struct fib_table *, struct fib_config *);
187 extern int fib_table_delete(struct fib_table *, struct fib_config *);
188 extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
189 struct netlink_callback *cb);
190 extern int fib_table_flush(struct fib_table *table);
191 extern void fib_free_table(struct fib_table *tb);
195 #ifndef CONFIG_IP_MULTIPLE_TABLES
197 #define TABLE_LOCAL_INDEX 0
198 #define TABLE_MAIN_INDEX 1
200 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
202 struct hlist_head *ptr;
204 ptr = id == RT_TABLE_LOCAL ?
205 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
206 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
207 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
210 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
212 return fib_get_table(net, id);
215 static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
216 struct fib_result *res)
218 struct fib_table *table;
220 table = fib_get_table(net, RT_TABLE_LOCAL);
221 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
224 table = fib_get_table(net, RT_TABLE_MAIN);
225 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
230 #else /* CONFIG_IP_MULTIPLE_TABLES */
231 extern int __net_init fib4_rules_init(struct net *net);
232 extern void __net_exit fib4_rules_exit(struct net *net);
234 extern struct fib_table *fib_new_table(struct net *net, u32 id);
235 extern struct fib_table *fib_get_table(struct net *net, u32 id);
237 extern int __fib_lookup(struct net *net, struct flowi4 *flp,
238 struct fib_result *res);
240 static inline int fib_lookup(struct net *net, struct flowi4 *flp,
241 struct fib_result *res)
243 if (!net->ipv4.fib_has_custom_rules) {
245 if (net->ipv4.fib_local &&
246 !fib_table_lookup(net->ipv4.fib_local, flp, res,
249 if (net->ipv4.fib_main &&
250 !fib_table_lookup(net->ipv4.fib_main, flp, res,
253 if (net->ipv4.fib_default &&
254 !fib_table_lookup(net->ipv4.fib_default, flp, res,
259 return __fib_lookup(net, flp, res);
262 #endif /* CONFIG_IP_MULTIPLE_TABLES */
264 /* Exported by fib_frontend.c */
265 extern const struct nla_policy rtm_ipv4_policy[];
266 extern void ip_fib_init(void);
267 extern __be32 fib_compute_spec_dst(struct sk_buff *skb);
268 extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
269 u8 tos, int oif, struct net_device *dev,
270 struct in_device *idev, u32 *itag);
271 extern void fib_select_default(struct fib_result *res);
272 #ifdef CONFIG_IP_ROUTE_CLASSID
273 static inline int fib_num_tclassid_users(struct net *net)
275 return net->ipv4.fib_num_tclassid_users;
278 static inline int fib_num_tclassid_users(struct net *net)
284 /* Exported by fib_semantics.c */
285 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
286 extern int fib_sync_down_dev(struct net_device *dev, int force);
287 extern int fib_sync_down_addr(struct net *net, __be32 local);
288 extern void fib_update_nh_saddrs(struct net_device *dev);
289 extern int fib_sync_up(struct net_device *dev);
290 extern void fib_select_multipath(struct fib_result *res);
292 /* Exported by fib_trie.c */
293 extern void fib_trie_init(void);
294 extern struct fib_table *fib_trie_table(u32 id);
296 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
298 #ifdef CONFIG_IP_ROUTE_CLASSID
299 #ifdef CONFIG_IP_MULTIPLE_TABLES
302 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
303 #ifdef CONFIG_IP_MULTIPLE_TABLES
304 rtag = res->tclassid;
312 extern void free_fib_info(struct fib_info *fi);
314 static inline void fib_info_put(struct fib_info *fi)
316 if (atomic_dec_and_test(&fi->fib_clntref))
320 #ifdef CONFIG_PROC_FS
321 extern int __net_init fib_proc_init(struct net *net);
322 extern void __net_exit fib_proc_exit(struct net *net);
324 static inline int fib_proc_init(struct net *net)
328 static inline void fib_proc_exit(struct net *net)
333 #endif /* _NET_FIB_H */