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;
51 struct fib_nh_exception {
52 struct fib_nh_exception __rcu *fnhe_next;
56 unsigned long fnhe_expires;
57 unsigned long fnhe_stamp;
60 struct fnhe_hash_bucket {
61 struct fib_nh_exception __rcu *chain;
64 #define FNHE_HASH_SIZE 2048
65 #define FNHE_RECLAIM_DEPTH 5
68 struct net_device *nh_dev;
69 struct hlist_node nh_hash;
70 struct fib_info *nh_parent;
71 unsigned int nh_flags;
72 unsigned char nh_scope;
73 #ifdef CONFIG_IP_ROUTE_MULTIPATH
77 #ifdef CONFIG_IP_ROUTE_CLASSID
84 struct rtable *nh_rth_output;
85 struct rtable *nh_rth_input;
86 struct fnhe_hash_bucket *nh_exceptions;
90 * This structure contains data shared by many of routes.
94 struct hlist_node fib_hash;
95 struct hlist_node fib_lhash;
99 unsigned int fib_flags;
100 unsigned char fib_dead;
101 unsigned char fib_protocol;
102 unsigned char fib_scope;
106 #define fib_mtu fib_metrics[RTAX_MTU-1]
107 #define fib_window fib_metrics[RTAX_WINDOW-1]
108 #define fib_rtt fib_metrics[RTAX_RTT-1]
109 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
111 #ifdef CONFIG_IP_ROUTE_MULTIPATH
115 struct fib_nh fib_nh[0];
116 #define fib_dev fib_nh[0].nh_dev
120 #ifdef CONFIG_IP_MULTIPLE_TABLES
126 unsigned char prefixlen;
127 unsigned char nh_sel;
132 struct fib_table *table;
133 struct list_head *fa_head;
136 struct fib_result_nl {
137 __be32 fl_addr; /* To be looked up*/
139 unsigned char fl_tos;
140 unsigned char fl_scope;
141 unsigned char tb_id_in;
143 unsigned char tb_id; /* Results */
144 unsigned char prefixlen;
145 unsigned char nh_sel;
151 #ifdef CONFIG_IP_ROUTE_MULTIPATH
153 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
155 #define FIB_TABLE_HASHSZ 2
157 #else /* CONFIG_IP_ROUTE_MULTIPATH */
159 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
161 #define FIB_TABLE_HASHSZ 256
163 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
165 extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
167 #define FIB_RES_SADDR(net, res) \
168 ((FIB_RES_NH(res).nh_saddr_genid == \
169 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
170 FIB_RES_NH(res).nh_saddr : \
171 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
172 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
173 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
174 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
176 #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
177 FIB_RES_SADDR(net, res))
180 struct hlist_node tb_hlist;
184 unsigned long tb_data[0];
187 extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
188 struct fib_result *res, int fib_flags);
189 extern int fib_table_insert(struct fib_table *, struct fib_config *);
190 extern int fib_table_delete(struct fib_table *, struct fib_config *);
191 extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
192 struct netlink_callback *cb);
193 extern int fib_table_flush(struct fib_table *table);
194 extern void fib_free_table(struct fib_table *tb);
198 #ifndef CONFIG_IP_MULTIPLE_TABLES
200 #define TABLE_LOCAL_INDEX 0
201 #define TABLE_MAIN_INDEX 1
203 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
205 struct hlist_head *ptr;
207 ptr = id == RT_TABLE_LOCAL ?
208 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
209 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
210 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
213 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
215 return fib_get_table(net, id);
218 static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
219 struct fib_result *res)
221 struct fib_table *table;
223 table = fib_get_table(net, RT_TABLE_LOCAL);
224 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
227 table = fib_get_table(net, RT_TABLE_MAIN);
228 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
233 #else /* CONFIG_IP_MULTIPLE_TABLES */
234 extern int __net_init fib4_rules_init(struct net *net);
235 extern void __net_exit fib4_rules_exit(struct net *net);
237 extern struct fib_table *fib_new_table(struct net *net, u32 id);
238 extern struct fib_table *fib_get_table(struct net *net, u32 id);
240 extern int __fib_lookup(struct net *net, struct flowi4 *flp,
241 struct fib_result *res);
243 static inline int fib_lookup(struct net *net, struct flowi4 *flp,
244 struct fib_result *res)
246 if (!net->ipv4.fib_has_custom_rules) {
248 if (net->ipv4.fib_local &&
249 !fib_table_lookup(net->ipv4.fib_local, flp, res,
252 if (net->ipv4.fib_main &&
253 !fib_table_lookup(net->ipv4.fib_main, flp, res,
256 if (net->ipv4.fib_default &&
257 !fib_table_lookup(net->ipv4.fib_default, flp, res,
262 return __fib_lookup(net, flp, res);
265 #endif /* CONFIG_IP_MULTIPLE_TABLES */
267 /* Exported by fib_frontend.c */
268 extern const struct nla_policy rtm_ipv4_policy[];
269 extern void ip_fib_init(void);
270 extern __be32 fib_compute_spec_dst(struct sk_buff *skb);
271 extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
272 u8 tos, int oif, struct net_device *dev,
273 struct in_device *idev, u32 *itag);
274 extern void fib_select_default(struct fib_result *res);
275 #ifdef CONFIG_IP_ROUTE_CLASSID
276 static inline int fib_num_tclassid_users(struct net *net)
278 return net->ipv4.fib_num_tclassid_users;
281 static inline int fib_num_tclassid_users(struct net *net)
287 /* Exported by fib_semantics.c */
288 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
289 extern int fib_sync_down_dev(struct net_device *dev, int force);
290 extern int fib_sync_down_addr(struct net *net, __be32 local);
291 extern void fib_update_nh_saddrs(struct net_device *dev);
292 extern int fib_sync_up(struct net_device *dev);
293 extern void fib_select_multipath(struct fib_result *res);
295 /* Exported by fib_trie.c */
296 extern void fib_trie_init(void);
297 extern struct fib_table *fib_trie_table(u32 id);
299 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
301 #ifdef CONFIG_IP_ROUTE_CLASSID
302 #ifdef CONFIG_IP_MULTIPLE_TABLES
305 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
306 #ifdef CONFIG_IP_MULTIPLE_TABLES
307 rtag = res->tclassid;
315 extern void free_fib_info(struct fib_info *fi);
317 static inline void fib_info_put(struct fib_info *fi)
319 if (atomic_dec_and_test(&fi->fib_clntref))
323 #ifdef CONFIG_PROC_FS
324 extern int __net_init fib_proc_init(struct net *net);
325 extern void __net_exit fib_proc_exit(struct net *net);
327 static inline int fib_proc_init(struct net *net)
331 static inline void fib_proc_exit(struct net *net)
336 #endif /* _NET_FIB_H */