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>
24 #include <linux/percpu.h>
41 struct rtnexthop *fc_mp;
46 struct nl_info fc_nlinfo;
52 struct fib_nh_exception {
53 struct fib_nh_exception __rcu *fnhe_next;
57 unsigned long fnhe_expires;
58 struct rtable __rcu *fnhe_rth;
59 unsigned long fnhe_stamp;
62 struct fnhe_hash_bucket {
63 struct fib_nh_exception __rcu *chain;
66 #define FNHE_HASH_SIZE 2048
67 #define FNHE_RECLAIM_DEPTH 5
70 struct net_device *nh_dev;
71 struct hlist_node nh_hash;
72 struct fib_info *nh_parent;
73 unsigned int nh_flags;
74 unsigned char nh_scope;
75 #ifdef CONFIG_IP_ROUTE_MULTIPATH
79 #ifdef CONFIG_IP_ROUTE_CLASSID
86 struct rtable __rcu * __percpu *nh_pcpu_rth_output;
87 struct rtable __rcu *nh_rth_input;
88 struct fnhe_hash_bucket *nh_exceptions;
92 * This structure contains data shared by many of routes.
96 struct hlist_node fib_hash;
97 struct hlist_node fib_lhash;
100 atomic_t fib_clntref;
101 unsigned int fib_flags;
102 unsigned char fib_dead;
103 unsigned char fib_protocol;
104 unsigned char fib_scope;
105 unsigned char fib_type;
109 #define fib_mtu fib_metrics[RTAX_MTU-1]
110 #define fib_window fib_metrics[RTAX_WINDOW-1]
111 #define fib_rtt fib_metrics[RTAX_RTT-1]
112 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
114 #ifdef CONFIG_IP_ROUTE_MULTIPATH
118 struct fib_nh fib_nh[0];
119 #define fib_dev fib_nh[0].nh_dev
123 #ifdef CONFIG_IP_MULTIPLE_TABLES
129 unsigned char prefixlen;
130 unsigned char nh_sel;
135 struct fib_table *table;
136 struct list_head *fa_head;
139 struct fib_result_nl {
140 __be32 fl_addr; /* To be looked up*/
142 unsigned char fl_tos;
143 unsigned char fl_scope;
144 unsigned char tb_id_in;
146 unsigned char tb_id; /* Results */
147 unsigned char prefixlen;
148 unsigned char nh_sel;
154 #ifdef CONFIG_IP_ROUTE_MULTIPATH
155 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
156 #else /* CONFIG_IP_ROUTE_MULTIPATH */
157 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
158 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
160 #ifdef CONFIG_IP_MULTIPLE_TABLES
161 #define FIB_TABLE_HASHSZ 256
163 #define FIB_TABLE_HASHSZ 2
166 extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
168 #define FIB_RES_SADDR(net, res) \
169 ((FIB_RES_NH(res).nh_saddr_genid == \
170 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
171 FIB_RES_NH(res).nh_saddr : \
172 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
173 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
174 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
175 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
177 #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
178 FIB_RES_SADDR(net, res))
181 struct hlist_node tb_hlist;
185 unsigned long tb_data[0];
188 extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
189 struct fib_result *res, int fib_flags);
190 extern int fib_table_insert(struct fib_table *, struct fib_config *);
191 extern int fib_table_delete(struct fib_table *, struct fib_config *);
192 extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
193 struct netlink_callback *cb);
194 extern int fib_table_flush(struct fib_table *table);
195 extern void fib_free_table(struct fib_table *tb);
199 #ifndef CONFIG_IP_MULTIPLE_TABLES
201 #define TABLE_LOCAL_INDEX 0
202 #define TABLE_MAIN_INDEX 1
204 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
206 struct hlist_head *ptr;
208 ptr = id == RT_TABLE_LOCAL ?
209 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
210 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
211 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
214 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
216 return fib_get_table(net, id);
219 static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
220 struct fib_result *res)
222 struct fib_table *table;
224 table = fib_get_table(net, RT_TABLE_LOCAL);
225 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
228 table = fib_get_table(net, RT_TABLE_MAIN);
229 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
234 #else /* CONFIG_IP_MULTIPLE_TABLES */
235 extern int __net_init fib4_rules_init(struct net *net);
236 extern void __net_exit fib4_rules_exit(struct net *net);
238 extern struct fib_table *fib_new_table(struct net *net, u32 id);
239 extern struct fib_table *fib_get_table(struct net *net, u32 id);
241 extern int __fib_lookup(struct net *net, struct flowi4 *flp,
242 struct fib_result *res);
244 static inline int fib_lookup(struct net *net, struct flowi4 *flp,
245 struct fib_result *res)
247 if (!net->ipv4.fib_has_custom_rules) {
249 if (net->ipv4.fib_local &&
250 !fib_table_lookup(net->ipv4.fib_local, flp, res,
253 if (net->ipv4.fib_main &&
254 !fib_table_lookup(net->ipv4.fib_main, flp, res,
257 if (net->ipv4.fib_default &&
258 !fib_table_lookup(net->ipv4.fib_default, flp, res,
263 return __fib_lookup(net, flp, res);
266 #endif /* CONFIG_IP_MULTIPLE_TABLES */
268 /* Exported by fib_frontend.c */
269 extern const struct nla_policy rtm_ipv4_policy[];
270 extern void ip_fib_init(void);
271 extern __be32 fib_compute_spec_dst(struct sk_buff *skb);
272 extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
273 u8 tos, int oif, struct net_device *dev,
274 struct in_device *idev, u32 *itag);
275 extern void fib_select_default(struct fib_result *res);
276 #ifdef CONFIG_IP_ROUTE_CLASSID
277 static inline int fib_num_tclassid_users(struct net *net)
279 return net->ipv4.fib_num_tclassid_users;
282 static inline int fib_num_tclassid_users(struct net *net)
288 /* Exported by fib_semantics.c */
289 extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
290 extern int fib_sync_down_dev(struct net_device *dev, int force);
291 extern int fib_sync_down_addr(struct net *net, __be32 local);
292 extern void fib_update_nh_saddrs(struct net_device *dev);
293 extern int fib_sync_up(struct net_device *dev);
294 extern void fib_select_multipath(struct fib_result *res);
296 /* Exported by fib_trie.c */
297 extern void fib_trie_init(void);
298 extern struct fib_table *fib_trie_table(u32 id);
300 static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
302 #ifdef CONFIG_IP_ROUTE_CLASSID
303 #ifdef CONFIG_IP_MULTIPLE_TABLES
306 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
307 #ifdef CONFIG_IP_MULTIPLE_TABLES
308 rtag = res->tclassid;
316 extern void free_fib_info(struct fib_info *fi);
318 static inline void fib_info_put(struct fib_info *fi)
320 if (atomic_dec_and_test(&fi->fib_clntref))
324 #ifdef CONFIG_PROC_FS
325 extern int __net_init fib_proc_init(struct net *net);
326 extern void __net_exit fib_proc_exit(struct net *net);
328 static inline int fib_proc_init(struct net *net)
332 static inline void fib_proc_exit(struct net *net)
337 #endif /* _NET_FIB_H */