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Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify
[net-next-2.6.git] / include / net / ip_fib.h
CommitLineData
1da177e4
LT		 1/*
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.
5 *
6 * Definitions for the Forwarding Information Base.
7 *
8 * Authors: A.N.Kuznetsov, <kuznet@ms2.inr.ac.ru>
9 *
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.
14 */
15
16#ifndef _NET_IP_FIB_H
17#define _NET_IP_FIB_H
18
1da177e4
LT		 19#include <net/flow.h>
20#include <linux/seq_file.h>
e1ef4bf2 21#include <net/fib_rules.h>
1da177e4 22
4e902c57 23struct fib_config {
4e902c57 24 u8 fc_dst_len;
4e902c57
TG		 25 u8 fc_tos;
26 u8 fc_protocol;
27 u8 fc_scope;
28 u8 fc_type;
b52f070c 29 /* 3 bytes unused */
4e902c57 30 u32 fc_table;
6d85c10a 31 __be32 fc_dst;
6d85c10a 32 __be32 fc_gw;
4e902c57
TG		 33 int fc_oif;
34 u32 fc_flags;
35 u32 fc_priority;
6d85c10a 36 __be32 fc_prefsrc;
4e902c57
TG		 37 struct nlattr *fc_mx;
38 struct rtnexthop *fc_mp;
39 int fc_mx_len;
40 int fc_mp_len;
41 u32 fc_flow;
4e902c57
TG		 42 u32 fc_nlflags;
43 struct nl_info fc_nlinfo;
44 };
1da177e4
LT		 45
46struct fib_info;
47
48struct fib_nh {
49 struct net_device *nh_dev;
50 struct hlist_node nh_hash;
51 struct fib_info *nh_parent;
52 unsigned nh_flags;
53 unsigned char nh_scope;
54#ifdef CONFIG_IP_ROUTE_MULTIPATH
55 int nh_weight;
56 int nh_power;
57#endif
58#ifdef CONFIG_NET_CLS_ROUTE
59 __u32 nh_tclassid;
60#endif
61 int nh_oif;
ed49e3ca 62 __be32 nh_gw;
1da177e4
LT		 63};
64
65/*
66 * This structure contains data shared by many of routes.
67 */
68
69struct fib_info {
70 struct hlist_node fib_hash;
71 struct hlist_node fib_lhash;
7462bd74 72 struct net *fib_net;
1da177e4
LT		 73 int fib_treeref;
74 atomic_t fib_clntref;
75 int fib_dead;
76 unsigned fib_flags;
77 int fib_protocol;
b83738ae 78 __be32 fib_prefsrc;
1da177e4
LT		 79 u32 fib_priority;
80 u32 fib_metrics[RTAX_MAX];
81#define fib_mtu fib_metrics[RTAX_MTU-1]
82#define fib_window fib_metrics[RTAX_WINDOW-1]
83#define fib_rtt fib_metrics[RTAX_RTT-1]
84#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
85 int fib_nhs;
86#ifdef CONFIG_IP_ROUTE_MULTIPATH
87 int fib_power;
1da177e4 88#endif
ebc0ffae 89 struct rcu_head rcu;
1da177e4
LT		 90 struct fib_nh fib_nh[0];
91#define fib_dev fib_nh[0].nh_dev
92};
93
94
95#ifdef CONFIG_IP_MULTIPLE_TABLES
96struct fib_rule;
97#endif
98
99struct fib_result {
100 unsigned char prefixlen;
101 unsigned char nh_sel;
102 unsigned char type;
103 unsigned char scope;
1da177e4
LT		 104 struct fib_info *fi;
105#ifdef CONFIG_IP_MULTIPLE_TABLES
106 struct fib_rule *r;
107#endif
108};
109
246955fe 110struct fib_result_nl {
80e856e1 111 __be32 fl_addr; /* To be looked up*/
5f300893 112 u32 fl_mark;
246955fe
RO		 113 unsigned char fl_tos;
114 unsigned char fl_scope;
115 unsigned char tb_id_in;
116
117 unsigned char tb_id; /* Results */
118 unsigned char prefixlen;
119 unsigned char nh_sel;
120 unsigned char type;
121 unsigned char scope;
122 int err;
123};
1da177e4
LT		 124
125#ifdef CONFIG_IP_ROUTE_MULTIPATH
126
127#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
1da177e4 128
93456b6d
DL		 129#define FIB_TABLE_HASHSZ 2
130
1da177e4
LT		 131#else /* CONFIG_IP_ROUTE_MULTIPATH */
132
133#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
1da177e4 134
93456b6d
DL		 135#define FIB_TABLE_HASHSZ 256
136
1da177e4
LT		 137#endif /* CONFIG_IP_ROUTE_MULTIPATH */
138
139#define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
140#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
141#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
142#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
143
1da177e4 144struct fib_table {
1af5a8c4 145 struct hlist_node tb_hlist;
2dfe55b4 146 u32 tb_id;
971b893e 147 int tb_default;
1da177e4
LT		 148 unsigned char tb_data[0];
149};
150
16c6cf8b 151extern int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
ebc0ffae 152 struct fib_result *res, int fib_flags);
16c6cf8b
SH		 153extern int fib_table_insert(struct fib_table *, struct fib_config *);
154extern int fib_table_delete(struct fib_table *, struct fib_config *);
155extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
156 struct netlink_callback *cb);
157extern int fib_table_flush(struct fib_table *table);
158extern void fib_table_select_default(struct fib_table *table,
159 const struct flowi *flp,
160 struct fib_result *res);
4aa2c466
PE		 161extern void fib_free_table(struct fib_table *tb);
162
16c6cf8b
SH		 163
164
1da177e4
LT		 165#ifndef CONFIG_IP_MULTIPLE_TABLES
166
93456b6d
DL		 167#define TABLE_LOCAL_INDEX 0
168#define TABLE_MAIN_INDEX 1
1da177e4 169
8ad4942c 170static inline struct fib_table *fib_get_table(struct net *net, u32 id)
1da177e4 171{
93456b6d
DL		 172 struct hlist_head *ptr;
173
174 ptr = id == RT_TABLE_LOCAL ?
e4aef8ae
DL		 175 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
176 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
93456b6d 177 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
1da177e4
LT		 178}
179
8ad4942c 180static inline struct fib_table *fib_new_table(struct net *net, u32 id)
1da177e4 181{
8ad4942c 182 return fib_get_table(net, id);
1da177e4
LT		 183}
184
da0e28cb
DL		 185static inline int fib_lookup(struct net *net, const struct flowi *flp,
186 struct fib_result *res)
1da177e4 187{
93456b6d
DL		 188 struct fib_table *table;
189
da0e28cb 190 table = fib_get_table(net, RT_TABLE_LOCAL);
ebc0ffae 191 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
93456b6d
DL		 192 return 0;
193
da0e28cb 194 table = fib_get_table(net, RT_TABLE_MAIN);
ebc0ffae 195 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
93456b6d
DL		 196 return 0;
197 return -ENETUNREACH;
1da177e4
LT		 198}
199
1da177e4 200#else /* CONFIG_IP_MULTIPLE_TABLES */
7b1a74fd
DL		 201extern int __net_init fib4_rules_init(struct net *net);
202extern void __net_exit fib4_rules_exit(struct net *net);
c3e9a353
PE		 203
204#ifdef CONFIG_NET_CLS_ROUTE
205extern u32 fib_rules_tclass(struct fib_result *res);
206#endif
207
da0e28cb 208extern int fib_lookup(struct net *n, struct flowi *flp, struct fib_result *res);
1da177e4 209
8ad4942c
DL		 210extern struct fib_table *fib_new_table(struct net *net, u32 id);
211extern struct fib_table *fib_get_table(struct net *net, u32 id);
1da177e4
LT		 212
213#endif /* CONFIG_IP_MULTIPLE_TABLES */
214
215/* Exported by fib_frontend.c */
ef7c79ed 216extern const struct nla_policy rtm_ipv4_policy[];
1da177e4 217extern void ip_fib_init(void);
d9c9df8c 218extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
b0c110ca 219 struct net_device *dev, __be32 *spec_dst,
220 u32 *itag, u32 mark);
010278ec
DL		 221extern void fib_select_default(struct net *net, const struct flowi *flp,
222 struct fib_result *res);
14c85021 223
1da177e4 224/* Exported by fib_semantics.c */
d878e72e 225extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
85326fa5 226extern int fib_sync_down_dev(struct net_device *dev, int force);
4814bdbd 227extern int fib_sync_down_addr(struct net *net, __be32 local);
1da177e4 228extern int fib_sync_up(struct net_device *dev);
b83738ae 229extern __be32 __fib_res_prefsrc(struct fib_result *res);
e30d3a0c 230extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
1da177e4 231
7f9b8052
SH		 232/* Exported by fib_{hash|trie}.c */
233extern void fib_hash_init(void);
234extern struct fib_table *fib_hash_table(u32 id);
1da177e4 235
1da177e4
LT		 236static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
237{
238#ifdef CONFIG_NET_CLS_ROUTE
239#ifdef CONFIG_IP_MULTIPLE_TABLES
240 u32 rtag;
241#endif
242 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
243#ifdef CONFIG_IP_MULTIPLE_TABLES
244 rtag = fib_rules_tclass(res);
245 if (*itag == 0)
246 *itag = (rtag<<16);
247 *itag |= (rtag>>16);
248#endif
249#endif
250}
251
252extern void free_fib_info(struct fib_info *fi);
253
254static inline void fib_info_put(struct fib_info *fi)
255{
256 if (atomic_dec_and_test(&fi->fib_clntref))
257 free_fib_info(fi);
258}
259
20380731 260#ifdef CONFIG_PROC_FS
61a02653
DL		 261extern int __net_init fib_proc_init(struct net *net);
262extern void __net_exit fib_proc_exit(struct net *net);
cc8274f5
LZ		 263#else
264static inline int fib_proc_init(struct net *net)
265{
266 return 0;
267}
268static inline void fib_proc_exit(struct net *net)
269{
270}
20380731
ACM		 271#endif
272
1da177e4 273#endif /* _NET_FIB_H */
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