Linux kernel mirror (for testing)
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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
19#include <net/flow.h>
20#include <linux/seq_file.h>
21#include <net/fib_rules.h>
22
23struct fib_config {
24 u8 fc_dst_len;
25 u8 fc_tos;
26 u8 fc_protocol;
27 u8 fc_scope;
28 u8 fc_type;
29 /* 3 bytes unused */
30 u32 fc_table;
31 __be32 fc_dst;
32 __be32 fc_gw;
33 int fc_oif;
34 u32 fc_flags;
35 u32 fc_priority;
36 __be32 fc_prefsrc;
37 struct nlattr *fc_mx;
38 struct rtnexthop *fc_mp;
39 int fc_mx_len;
40 int fc_mp_len;
41 u32 fc_flow;
42 u32 fc_nlflags;
43 struct nl_info fc_nlinfo;
44 };
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;
62 __be32 nh_gw;
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;
72 struct net *fib_net;
73 int fib_treeref;
74 atomic_t fib_clntref;
75 int fib_dead;
76 unsigned fib_flags;
77 int fib_protocol;
78 __be32 fib_prefsrc;
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;
88#endif
89 struct fib_nh fib_nh[0];
90#define fib_dev fib_nh[0].nh_dev
91};
92
93
94#ifdef CONFIG_IP_MULTIPLE_TABLES
95struct fib_rule;
96#endif
97
98struct fib_result {
99 unsigned char prefixlen;
100 unsigned char nh_sel;
101 unsigned char type;
102 unsigned char scope;
103 struct fib_info *fi;
104#ifdef CONFIG_IP_MULTIPLE_TABLES
105 struct fib_rule *r;
106#endif
107};
108
109struct fib_result_nl {
110 __be32 fl_addr; /* To be looked up*/
111 u32 fl_mark;
112 unsigned char fl_tos;
113 unsigned char fl_scope;
114 unsigned char tb_id_in;
115
116 unsigned char tb_id; /* Results */
117 unsigned char prefixlen;
118 unsigned char nh_sel;
119 unsigned char type;
120 unsigned char scope;
121 int err;
122};
123
124#ifdef CONFIG_IP_ROUTE_MULTIPATH
125
126#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
127#define FIB_RES_RESET(res) ((res).nh_sel = 0)
128
129#define FIB_TABLE_HASHSZ 2
130
131#else /* CONFIG_IP_ROUTE_MULTIPATH */
132
133#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
134#define FIB_RES_RESET(res)
135
136#define FIB_TABLE_HASHSZ 256
137
138#endif /* CONFIG_IP_ROUTE_MULTIPATH */
139
140#define FIB_RES_PREFSRC(res) ((res).fi->fib_prefsrc ? : __fib_res_prefsrc(&res))
141#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
142#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
143#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
144
145struct fib_table {
146 struct hlist_node tb_hlist;
147 u32 tb_id;
148 unsigned tb_stamp;
149 int tb_default;
150 int (*tb_lookup)(struct fib_table *tb, const struct flowi *flp, struct fib_result *res);
151 int (*tb_insert)(struct fib_table *, struct fib_config *);
152 int (*tb_delete)(struct fib_table *, struct fib_config *);
153 int (*tb_dump)(struct fib_table *table, struct sk_buff *skb,
154 struct netlink_callback *cb);
155 int (*tb_flush)(struct fib_table *table);
156 void (*tb_select_default)(struct fib_table *table,
157 const struct flowi *flp, struct fib_result *res);
158
159 unsigned char tb_data[0];
160};
161
162#ifndef CONFIG_IP_MULTIPLE_TABLES
163
164#define TABLE_LOCAL_INDEX 0
165#define TABLE_MAIN_INDEX 1
166
167static inline struct fib_table *fib_get_table(struct net *net, u32 id)
168{
169 struct hlist_head *ptr;
170
171 ptr = id == RT_TABLE_LOCAL ?
172 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
173 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
174 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
175}
176
177static inline struct fib_table *fib_new_table(struct net *net, u32 id)
178{
179 return fib_get_table(net, id);
180}
181
182static inline int fib_lookup(struct net *net, const struct flowi *flp,
183 struct fib_result *res)
184{
185 struct fib_table *table;
186
187 table = fib_get_table(net, RT_TABLE_LOCAL);
188 if (!table->tb_lookup(table, flp, res))
189 return 0;
190
191 table = fib_get_table(net, RT_TABLE_MAIN);
192 if (!table->tb_lookup(table, flp, res))
193 return 0;
194 return -ENETUNREACH;
195}
196
197#else /* CONFIG_IP_MULTIPLE_TABLES */
198extern int __net_init fib4_rules_init(struct net *net);
199extern void __net_exit fib4_rules_exit(struct net *net);
200
201#ifdef CONFIG_NET_CLS_ROUTE
202extern u32 fib_rules_tclass(struct fib_result *res);
203#endif
204
205extern int fib_lookup(struct net *n, struct flowi *flp, struct fib_result *res);
206
207extern struct fib_table *fib_new_table(struct net *net, u32 id);
208extern struct fib_table *fib_get_table(struct net *net, u32 id);
209
210#endif /* CONFIG_IP_MULTIPLE_TABLES */
211
212/* Exported by fib_frontend.c */
213extern const struct nla_policy rtm_ipv4_policy[];
214extern void ip_fib_init(void);
215extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
216 struct net_device *dev, __be32 *spec_dst, u32 *itag);
217extern void fib_select_default(struct net *net, const struct flowi *flp,
218 struct fib_result *res);
219
220/* Exported by fib_semantics.c */
221extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
222extern int fib_sync_down_dev(struct net_device *dev, int force);
223extern int fib_sync_down_addr(struct net *net, __be32 local);
224extern int fib_sync_up(struct net_device *dev);
225extern __be32 __fib_res_prefsrc(struct fib_result *res);
226extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
227
228/* Exported by fib_{hash|trie}.c */
229extern void fib_hash_init(void);
230extern struct fib_table *fib_hash_table(u32 id);
231
232static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
233{
234#ifdef CONFIG_NET_CLS_ROUTE
235#ifdef CONFIG_IP_MULTIPLE_TABLES
236 u32 rtag;
237#endif
238 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
239#ifdef CONFIG_IP_MULTIPLE_TABLES
240 rtag = fib_rules_tclass(res);
241 if (*itag == 0)
242 *itag = (rtag<<16);
243 *itag |= (rtag>>16);
244#endif
245#endif
246}
247
248extern void free_fib_info(struct fib_info *fi);
249
250static inline void fib_info_put(struct fib_info *fi)
251{
252 if (atomic_dec_and_test(&fi->fib_clntref))
253 free_fib_info(fi);
254}
255
256static inline void fib_res_put(struct fib_result *res)
257{
258 if (res->fi)
259 fib_info_put(res->fi);
260#ifdef CONFIG_IP_MULTIPLE_TABLES
261 if (res->r)
262 fib_rule_put(res->r);
263#endif
264}
265
266#ifdef CONFIG_PROC_FS
267extern int __net_init fib_proc_init(struct net *net);
268extern void __net_exit fib_proc_exit(struct net *net);
269#endif
270
271#endif /* _NET_FIB_H */