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;
58 unsigned long fnhe_expires;
59 struct rtable __rcu *fnhe_rth_input;
60 struct rtable __rcu *fnhe_rth_output;
61 unsigned long fnhe_stamp;
64 struct fnhe_hash_bucket {
65 struct fib_nh_exception __rcu *chain;
68 #define FNHE_HASH_SIZE 2048
69 #define FNHE_RECLAIM_DEPTH 5
72 struct net_device *nh_dev;
73 struct hlist_node nh_hash;
74 struct fib_info *nh_parent;
75 unsigned int nh_flags;
76 unsigned char nh_scope;
77 #ifdef CONFIG_IP_ROUTE_MULTIPATH
81 #ifdef CONFIG_IP_ROUTE_CLASSID
88 struct rtable __rcu * __percpu *nh_pcpu_rth_output;
89 struct rtable __rcu *nh_rth_input;
90 struct fnhe_hash_bucket *nh_exceptions;
94 * This structure contains data shared by many of routes.
98 struct hlist_node fib_hash;
99 struct hlist_node fib_lhash;
102 atomic_t fib_clntref;
103 unsigned int fib_flags;
104 unsigned char fib_dead;
105 unsigned char fib_protocol;
106 unsigned char fib_scope;
107 unsigned char fib_type;
111 #define fib_mtu fib_metrics[RTAX_MTU-1]
112 #define fib_window fib_metrics[RTAX_WINDOW-1]
113 #define fib_rtt fib_metrics[RTAX_RTT-1]
114 #define fib_advmss fib_metrics[RTAX_ADVMSS-1]
116 #ifdef CONFIG_IP_ROUTE_MULTIPATH
120 struct fib_nh fib_nh[0];
121 #define fib_dev fib_nh[0].nh_dev
125 #ifdef CONFIG_IP_MULTIPLE_TABLES
131 unsigned char prefixlen;
132 unsigned char nh_sel;
137 struct fib_table *table;
138 struct list_head *fa_head;
141 struct fib_result_nl {
142 __be32 fl_addr; /* To be looked up*/
144 unsigned char fl_tos;
145 unsigned char fl_scope;
146 unsigned char tb_id_in;
148 unsigned char tb_id; /* Results */
149 unsigned char prefixlen;
150 unsigned char nh_sel;
156 #ifdef CONFIG_IP_ROUTE_MULTIPATH
157 #define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
158 #else /* CONFIG_IP_ROUTE_MULTIPATH */
159 #define FIB_RES_NH(res) ((res).fi->fib_nh[0])
160 #endif /* CONFIG_IP_ROUTE_MULTIPATH */
162 #ifdef CONFIG_IP_MULTIPLE_TABLES
163 #define FIB_TABLE_HASHSZ 256
165 #define FIB_TABLE_HASHSZ 2
168 __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
170 #define FIB_RES_SADDR(net, res) \
171 ((FIB_RES_NH(res).nh_saddr_genid == \
172 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
173 FIB_RES_NH(res).nh_saddr : \
174 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
175 #define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
176 #define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
177 #define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
179 #define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
180 FIB_RES_SADDR(net, res))
183 struct hlist_node tb_hlist;
187 unsigned long tb_data[0];
190 int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
191 struct fib_result *res, int fib_flags);
192 int fib_table_insert(struct fib_table *, struct fib_config *);
193 int fib_table_delete(struct fib_table *, struct fib_config *);
194 int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
195 struct netlink_callback *cb);
196 int fib_table_flush(struct fib_table *table);
197 void fib_free_table(struct fib_table *tb);
201 #ifndef CONFIG_IP_MULTIPLE_TABLES
203 #define TABLE_LOCAL_INDEX 0
204 #define TABLE_MAIN_INDEX 1
206 static inline struct fib_table *fib_get_table(struct net *net, u32 id)
208 struct hlist_head *ptr;
210 ptr = id == RT_TABLE_LOCAL ?
211 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
212 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
213 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
216 static inline struct fib_table *fib_new_table(struct net *net, u32 id)
218 return fib_get_table(net, id);
221 static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
222 struct fib_result *res)
224 struct fib_table *table;
226 table = fib_get_table(net, RT_TABLE_LOCAL);
227 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
230 table = fib_get_table(net, RT_TABLE_MAIN);
231 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
236 #else /* CONFIG_IP_MULTIPLE_TABLES */
237 int __net_init fib4_rules_init(struct net *net);
238 void __net_exit fib4_rules_exit(struct net *net);
240 struct fib_table *fib_new_table(struct net *net, u32 id);
241 struct fib_table *fib_get_table(struct net *net, u32 id);
243 int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res);
245 static inline int fib_lookup(struct net *net, struct flowi4 *flp,
246 struct fib_result *res)
248 if (!net->ipv4.fib_has_custom_rules) {
250 if (net->ipv4.fib_local &&
251 !fib_table_lookup(net->ipv4.fib_local, flp, res,
254 if (net->ipv4.fib_main &&
255 !fib_table_lookup(net->ipv4.fib_main, flp, res,
258 if (net->ipv4.fib_default &&
259 !fib_table_lookup(net->ipv4.fib_default, flp, res,
264 return __fib_lookup(net, flp, res);
267 #endif /* CONFIG_IP_MULTIPLE_TABLES */
269 /* Exported by fib_frontend.c */
270 extern const struct nla_policy rtm_ipv4_policy[];
271 void ip_fib_init(void);
272 __be32 fib_compute_spec_dst(struct sk_buff *skb);
273 int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
274 u8 tos, int oif, struct net_device *dev,
275 struct in_device *idev, u32 *itag);
276 void fib_select_default(struct fib_result *res);
277 #ifdef CONFIG_IP_ROUTE_CLASSID
278 static inline int fib_num_tclassid_users(struct net *net)
280 return net->ipv4.fib_num_tclassid_users;
283 static inline int fib_num_tclassid_users(struct net *net)
289 /* Exported by fib_semantics.c */
290 int ip_fib_check_default(__be32 gw, struct net_device *dev);
291 int fib_sync_down_dev(struct net_device *dev, int force);
292 int fib_sync_down_addr(struct net *net, __be32 local);
293 int fib_sync_up(struct net_device *dev);
294 void fib_select_multipath(struct fib_result *res);
296 /* Exported by fib_trie.c */
297 void fib_trie_init(void);
298 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 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 int __net_init fib_proc_init(struct net *net);
326 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 */