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_IP_ROUTE_CLASSID
59 __u32 nh_tclassid;
60#endif
61 int nh_oif;
62 __be32 nh_gw;
63 __be32 nh_saddr;
64 int nh_saddr_genid;
65};
66
67/*
68 * This structure contains data shared by many of routes.
69 */
70
71struct fib_info {
72 struct hlist_node fib_hash;
73 struct hlist_node fib_lhash;
74 struct net *fib_net;
75 int fib_treeref;
76 atomic_t fib_clntref;
77 unsigned fib_flags;
78 unsigned char fib_dead;
79 unsigned char fib_protocol;
80 unsigned char fib_scope;
81 __be32 fib_prefsrc;
82 u32 fib_priority;
83 u32 *fib_metrics;
84#define fib_mtu fib_metrics[RTAX_MTU-1]
85#define fib_window fib_metrics[RTAX_WINDOW-1]
86#define fib_rtt fib_metrics[RTAX_RTT-1]
87#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
88 int fib_nhs;
89#ifdef CONFIG_IP_ROUTE_MULTIPATH
90 int fib_power;
91#endif
92 struct rcu_head rcu;
93 struct fib_nh fib_nh[0];
94#define fib_dev fib_nh[0].nh_dev
95};
96
97
98#ifdef CONFIG_IP_MULTIPLE_TABLES
99struct fib_rule;
100#endif
101
102struct fib_table;
103struct fib_result {
104 unsigned char prefixlen;
105 unsigned char nh_sel;
106 unsigned char type;
107 unsigned char scope;
108 struct fib_info *fi;
109 struct fib_table *table;
110 struct list_head *fa_head;
111#ifdef CONFIG_IP_MULTIPLE_TABLES
112 struct fib_rule *r;
113#endif
114};
115
116struct fib_result_nl {
117 __be32 fl_addr; /* To be looked up*/
118 u32 fl_mark;
119 unsigned char fl_tos;
120 unsigned char fl_scope;
121 unsigned char tb_id_in;
122
123 unsigned char tb_id; /* Results */
124 unsigned char prefixlen;
125 unsigned char nh_sel;
126 unsigned char type;
127 unsigned char scope;
128 int err;
129};
130
131#ifdef CONFIG_IP_ROUTE_MULTIPATH
132
133#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
134
135#define FIB_TABLE_HASHSZ 2
136
137#else /* CONFIG_IP_ROUTE_MULTIPATH */
138
139#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
140
141#define FIB_TABLE_HASHSZ 256
142
143#endif /* CONFIG_IP_ROUTE_MULTIPATH */
144
145extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
146
147#define FIB_RES_SADDR(net, res) \
148 ((FIB_RES_NH(res).nh_saddr_genid == \
149 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
150 FIB_RES_NH(res).nh_saddr : \
151 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
152#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
153#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
154#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
155
156#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
157 FIB_RES_SADDR(net, res))
158
159struct fib_table {
160 struct hlist_node tb_hlist;
161 u32 tb_id;
162 int tb_default;
163 unsigned char tb_data[0];
164};
165
166extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
167 struct fib_result *res, int fib_flags);
168extern int fib_table_insert(struct fib_table *, struct fib_config *);
169extern int fib_table_delete(struct fib_table *, struct fib_config *);
170extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
171 struct netlink_callback *cb);
172extern int fib_table_flush(struct fib_table *table);
173extern void fib_free_table(struct fib_table *tb);
174
175
176
177#ifndef CONFIG_IP_MULTIPLE_TABLES
178
179#define TABLE_LOCAL_INDEX 0
180#define TABLE_MAIN_INDEX 1
181
182static inline struct fib_table *fib_get_table(struct net *net, u32 id)
183{
184 struct hlist_head *ptr;
185
186 ptr = id == RT_TABLE_LOCAL ?
187 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
188 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
189 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
190}
191
192static inline struct fib_table *fib_new_table(struct net *net, u32 id)
193{
194 return fib_get_table(net, id);
195}
196
197static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
198 struct fib_result *res)
199{
200 struct fib_table *table;
201
202 table = fib_get_table(net, RT_TABLE_LOCAL);
203 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
204 return 0;
205
206 table = fib_get_table(net, RT_TABLE_MAIN);
207 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
208 return 0;
209 return -ENETUNREACH;
210}
211
212#else /* CONFIG_IP_MULTIPLE_TABLES */
213extern int __net_init fib4_rules_init(struct net *net);
214extern void __net_exit fib4_rules_exit(struct net *net);
215
216#ifdef CONFIG_IP_ROUTE_CLASSID
217extern u32 fib_rules_tclass(const struct fib_result *res);
218#endif
219
220extern int fib_lookup(struct net *n, struct flowi4 *flp, struct fib_result *res);
221
222extern struct fib_table *fib_new_table(struct net *net, u32 id);
223extern struct fib_table *fib_get_table(struct net *net, u32 id);
224
225#endif /* CONFIG_IP_MULTIPLE_TABLES */
226
227/* Exported by fib_frontend.c */
228extern const struct nla_policy rtm_ipv4_policy[];
229extern void ip_fib_init(void);
230extern int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
231 struct net_device *dev, __be32 *spec_dst,
232 u32 *itag, u32 mark);
233extern void fib_select_default(struct fib_result *res);
234
235/* Exported by fib_semantics.c */
236extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
237extern int fib_sync_down_dev(struct net_device *dev, int force);
238extern int fib_sync_down_addr(struct net *net, __be32 local);
239extern void fib_update_nh_saddrs(struct net_device *dev);
240extern int fib_sync_up(struct net_device *dev);
241extern void fib_select_multipath(struct fib_result *res);
242
243/* Exported by fib_trie.c */
244extern void fib_trie_init(void);
245extern struct fib_table *fib_trie_table(u32 id);
246
247static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
248{
249#ifdef CONFIG_IP_ROUTE_CLASSID
250#ifdef CONFIG_IP_MULTIPLE_TABLES
251 u32 rtag;
252#endif
253 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
254#ifdef CONFIG_IP_MULTIPLE_TABLES
255 rtag = fib_rules_tclass(res);
256 if (*itag == 0)
257 *itag = (rtag<<16);
258 *itag |= (rtag>>16);
259#endif
260#endif
261}
262
263extern void free_fib_info(struct fib_info *fi);
264
265static inline void fib_info_put(struct fib_info *fi)
266{
267 if (atomic_dec_and_test(&fi->fib_clntref))
268 free_fib_info(fi);
269}
270
271#ifdef CONFIG_PROC_FS
272extern int __net_init fib_proc_init(struct net *net);
273extern void __net_exit fib_proc_exit(struct net *net);
274#else
275static inline int fib_proc_init(struct net *net)
276{
277 return 0;
278}
279static inline void fib_proc_exit(struct net *net)
280{
281}
282#endif
283
284#endif /* _NET_FIB_H */