tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 rcu_head rcu;
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;
104 struct fib_info *fi;
105#ifdef CONFIG_IP_MULTIPLE_TABLES
106 struct fib_rule *r;
107#endif
108};
109
110struct fib_result_nl {
111 __be32 fl_addr; /* To be looked up*/
112 u32 fl_mark;
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};
124
125#ifdef CONFIG_IP_ROUTE_MULTIPATH
126
127#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
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
135#define FIB_TABLE_HASHSZ 256
136
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
144struct fib_table {
145 struct hlist_node tb_hlist;
146 u32 tb_id;
147 int tb_default;
148 unsigned char tb_data[0];
149};
150
151extern int fib_table_lookup(struct fib_table *tb, const struct flowi *flp,
152 struct fib_result *res, int fib_flags);
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);
161extern void fib_free_table(struct fib_table *tb);
162
163
164
165#ifndef CONFIG_IP_MULTIPLE_TABLES
166
167#define TABLE_LOCAL_INDEX 0
168#define TABLE_MAIN_INDEX 1
169
170static inline struct fib_table *fib_get_table(struct net *net, u32 id)
171{
172 struct hlist_head *ptr;
173
174 ptr = id == RT_TABLE_LOCAL ?
175 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
176 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
177 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
178}
179
180static inline struct fib_table *fib_new_table(struct net *net, u32 id)
181{
182 return fib_get_table(net, id);
183}
184
185static inline int fib_lookup(struct net *net, const struct flowi *flp,
186 struct fib_result *res)
187{
188 struct fib_table *table;
189
190 table = fib_get_table(net, RT_TABLE_LOCAL);
191 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
192 return 0;
193
194 table = fib_get_table(net, RT_TABLE_MAIN);
195 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
196 return 0;
197 return -ENETUNREACH;
198}
199
200#else /* CONFIG_IP_MULTIPLE_TABLES */
201extern int __net_init fib4_rules_init(struct net *net);
202extern void __net_exit fib4_rules_exit(struct net *net);
203
204#ifdef CONFIG_NET_CLS_ROUTE
205extern u32 fib_rules_tclass(struct fib_result *res);
206#endif
207
208extern int fib_lookup(struct net *n, struct flowi *flp, struct fib_result *res);
209
210extern struct fib_table *fib_new_table(struct net *net, u32 id);
211extern struct fib_table *fib_get_table(struct net *net, u32 id);
212
213#endif /* CONFIG_IP_MULTIPLE_TABLES */
214
215/* Exported by fib_frontend.c */
216extern const struct nla_policy rtm_ipv4_policy[];
217extern void ip_fib_init(void);
218extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
219 struct net_device *dev, __be32 *spec_dst,
220 u32 *itag, u32 mark);
221extern void fib_select_default(struct net *net, const struct flowi *flp,
222 struct fib_result *res);
223
224/* Exported by fib_semantics.c */
225extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
226extern int fib_sync_down_dev(struct net_device *dev, int force);
227extern int fib_sync_down_addr(struct net *net, __be32 local);
228extern int fib_sync_up(struct net_device *dev);
229extern __be32 __fib_res_prefsrc(struct fib_result *res);
230extern void fib_select_multipath(const struct flowi *flp, struct fib_result *res);
231
232/* Exported by fib_{hash|trie}.c */
233extern void fib_hash_init(void);
234extern struct fib_table *fib_hash_table(u32 id);
235
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
260#ifdef CONFIG_PROC_FS
261extern int __net_init fib_proc_init(struct net *net);
262extern void __net_exit fib_proc_exit(struct net *net);
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}
271#endif
272
273#endif /* _NET_FIB_H */