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 <linux/rcupdate.h>
22#include <net/fib_rules.h>
23#include <net/inetpeer.h>
24#include <linux/percpu.h>
25
26struct fib_config {
27 u8 fc_dst_len;
28 u8 fc_tos;
29 u8 fc_protocol;
30 u8 fc_scope;
31 u8 fc_type;
32 /* 3 bytes unused */
33 u32 fc_table;
34 __be32 fc_dst;
35 __be32 fc_gw;
36 int fc_oif;
37 u32 fc_flags;
38 u32 fc_priority;
39 __be32 fc_prefsrc;
40 struct nlattr *fc_mx;
41 struct rtnexthop *fc_mp;
42 int fc_mx_len;
43 int fc_mp_len;
44 u32 fc_flow;
45 u32 fc_nlflags;
46 struct nl_info fc_nlinfo;
47 };
48
49struct fib_info;
50struct rtable;
51
52struct fib_nh_exception {
53 struct fib_nh_exception __rcu *fnhe_next;
54 int fnhe_genid;
55 __be32 fnhe_daddr;
56 u32 fnhe_pmtu;
57 __be32 fnhe_gw;
58 unsigned long fnhe_expires;
59 struct rtable __rcu *fnhe_rth_input;
60 struct rtable __rcu *fnhe_rth_output;
61 unsigned long fnhe_stamp;
62};
63
64struct fnhe_hash_bucket {
65 struct fib_nh_exception __rcu *chain;
66};
67
68#define FNHE_HASH_SIZE 2048
69#define FNHE_RECLAIM_DEPTH 5
70
71struct fib_nh {
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
78 int nh_weight;
79 int nh_power;
80#endif
81#ifdef CONFIG_IP_ROUTE_CLASSID
82 __u32 nh_tclassid;
83#endif
84 int nh_oif;
85 __be32 nh_gw;
86 __be32 nh_saddr;
87 int nh_saddr_genid;
88 struct rtable __rcu * __percpu *nh_pcpu_rth_output;
89 struct rtable __rcu *nh_rth_input;
90 struct fnhe_hash_bucket *nh_exceptions;
91};
92
93/*
94 * This structure contains data shared by many of routes.
95 */
96
97struct fib_info {
98 struct hlist_node fib_hash;
99 struct hlist_node fib_lhash;
100 struct net *fib_net;
101 int fib_treeref;
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;
108 __be32 fib_prefsrc;
109 u32 fib_priority;
110 u32 *fib_metrics;
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]
115 int fib_nhs;
116#ifdef CONFIG_IP_ROUTE_MULTIPATH
117 int fib_power;
118#endif
119 struct rcu_head rcu;
120 struct fib_nh fib_nh[0];
121#define fib_dev fib_nh[0].nh_dev
122};
123
124
125#ifdef CONFIG_IP_MULTIPLE_TABLES
126struct fib_rule;
127#endif
128
129struct fib_table;
130struct fib_result {
131 unsigned char prefixlen;
132 unsigned char nh_sel;
133 unsigned char type;
134 unsigned char scope;
135 u32 tclassid;
136 struct fib_info *fi;
137 struct fib_table *table;
138 struct list_head *fa_head;
139};
140
141struct fib_result_nl {
142 __be32 fl_addr; /* To be looked up*/
143 u32 fl_mark;
144 unsigned char fl_tos;
145 unsigned char fl_scope;
146 unsigned char tb_id_in;
147
148 unsigned char tb_id; /* Results */
149 unsigned char prefixlen;
150 unsigned char nh_sel;
151 unsigned char type;
152 unsigned char scope;
153 int err;
154};
155
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 */
161
162#ifdef CONFIG_IP_MULTIPLE_TABLES
163#define FIB_TABLE_HASHSZ 256
164#else
165#define FIB_TABLE_HASHSZ 2
166#endif
167
168__be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
169
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)
178
179#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
180 FIB_RES_SADDR(net, res))
181
182struct fib_table {
183 struct hlist_node tb_hlist;
184 u32 tb_id;
185 int tb_default;
186 int tb_num_default;
187 unsigned long tb_data[0];
188};
189
190int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
191 struct fib_result *res, int fib_flags);
192int fib_table_insert(struct fib_table *, struct fib_config *);
193int fib_table_delete(struct fib_table *, struct fib_config *);
194int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
195 struct netlink_callback *cb);
196int fib_table_flush(struct fib_table *table);
197void fib_free_table(struct fib_table *tb);
198
199
200
201#ifndef CONFIG_IP_MULTIPLE_TABLES
202
203#define TABLE_LOCAL_INDEX 0
204#define TABLE_MAIN_INDEX 1
205
206static inline struct fib_table *fib_get_table(struct net *net, u32 id)
207{
208 struct hlist_head *ptr;
209
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);
214}
215
216static inline struct fib_table *fib_new_table(struct net *net, u32 id)
217{
218 return fib_get_table(net, id);
219}
220
221static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
222 struct fib_result *res)
223{
224 struct fib_table *table;
225
226 table = fib_get_table(net, RT_TABLE_LOCAL);
227 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
228 return 0;
229
230 table = fib_get_table(net, RT_TABLE_MAIN);
231 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
232 return 0;
233 return -ENETUNREACH;
234}
235
236#else /* CONFIG_IP_MULTIPLE_TABLES */
237int __net_init fib4_rules_init(struct net *net);
238void __net_exit fib4_rules_exit(struct net *net);
239
240struct fib_table *fib_new_table(struct net *net, u32 id);
241struct fib_table *fib_get_table(struct net *net, u32 id);
242
243int __fib_lookup(struct net *net, struct flowi4 *flp, struct fib_result *res);
244
245static inline int fib_lookup(struct net *net, struct flowi4 *flp,
246 struct fib_result *res)
247{
248 if (!net->ipv4.fib_has_custom_rules) {
249 res->tclassid = 0;
250 if (net->ipv4.fib_local &&
251 !fib_table_lookup(net->ipv4.fib_local, flp, res,
252 FIB_LOOKUP_NOREF))
253 return 0;
254 if (net->ipv4.fib_main &&
255 !fib_table_lookup(net->ipv4.fib_main, flp, res,
256 FIB_LOOKUP_NOREF))
257 return 0;
258 if (net->ipv4.fib_default &&
259 !fib_table_lookup(net->ipv4.fib_default, flp, res,
260 FIB_LOOKUP_NOREF))
261 return 0;
262 return -ENETUNREACH;
263 }
264 return __fib_lookup(net, flp, res);
265}
266
267#endif /* CONFIG_IP_MULTIPLE_TABLES */
268
269/* Exported by fib_frontend.c */
270extern const struct nla_policy rtm_ipv4_policy[];
271void ip_fib_init(void);
272__be32 fib_compute_spec_dst(struct sk_buff *skb);
273int 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);
276void fib_select_default(struct fib_result *res);
277#ifdef CONFIG_IP_ROUTE_CLASSID
278static inline int fib_num_tclassid_users(struct net *net)
279{
280 return net->ipv4.fib_num_tclassid_users;
281}
282#else
283static inline int fib_num_tclassid_users(struct net *net)
284{
285 return 0;
286}
287#endif
288
289/* Exported by fib_semantics.c */
290int ip_fib_check_default(__be32 gw, struct net_device *dev);
291int fib_sync_down_dev(struct net_device *dev, int force);
292int fib_sync_down_addr(struct net *net, __be32 local);
293int fib_sync_up(struct net_device *dev);
294void fib_select_multipath(struct fib_result *res);
295
296/* Exported by fib_trie.c */
297void fib_trie_init(void);
298struct fib_table *fib_trie_table(u32 id);
299
300static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
301{
302#ifdef CONFIG_IP_ROUTE_CLASSID
303#ifdef CONFIG_IP_MULTIPLE_TABLES
304 u32 rtag;
305#endif
306 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
307#ifdef CONFIG_IP_MULTIPLE_TABLES
308 rtag = res->tclassid;
309 if (*itag == 0)
310 *itag = (rtag<<16);
311 *itag |= (rtag>>16);
312#endif
313#endif
314}
315
316void free_fib_info(struct fib_info *fi);
317
318static inline void fib_info_put(struct fib_info *fi)
319{
320 if (atomic_dec_and_test(&fi->fib_clntref))
321 free_fib_info(fi);
322}
323
324#ifdef CONFIG_PROC_FS
325int __net_init fib_proc_init(struct net *net);
326void __net_exit fib_proc_exit(struct net *net);
327#else
328static inline int fib_proc_init(struct net *net)
329{
330 return 0;
331}
332static inline void fib_proc_exit(struct net *net)
333{
334}
335#endif
336
337#endif /* _NET_FIB_H */