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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 __be32 fnhe_daddr;
55 u32 fnhe_pmtu;
56 __be32 fnhe_gw;
57 unsigned long fnhe_expires;
58 struct rtable __rcu *fnhe_rth;
59 unsigned long fnhe_stamp;
60};
61
62struct fnhe_hash_bucket {
63 struct fib_nh_exception __rcu *chain;
64};
65
66#define FNHE_HASH_SIZE 2048
67#define FNHE_RECLAIM_DEPTH 5
68
69struct fib_nh {
70 struct net_device *nh_dev;
71 struct hlist_node nh_hash;
72 struct fib_info *nh_parent;
73 unsigned int nh_flags;
74 unsigned char nh_scope;
75#ifdef CONFIG_IP_ROUTE_MULTIPATH
76 int nh_weight;
77 int nh_power;
78#endif
79#ifdef CONFIG_IP_ROUTE_CLASSID
80 __u32 nh_tclassid;
81#endif
82 int nh_oif;
83 __be32 nh_gw;
84 __be32 nh_saddr;
85 int nh_saddr_genid;
86 struct rtable __rcu * __percpu *nh_pcpu_rth_output;
87 struct rtable __rcu *nh_rth_input;
88 struct fnhe_hash_bucket *nh_exceptions;
89};
90
91/*
92 * This structure contains data shared by many of routes.
93 */
94
95struct fib_info {
96 struct hlist_node fib_hash;
97 struct hlist_node fib_lhash;
98 struct net *fib_net;
99 int fib_treeref;
100 atomic_t fib_clntref;
101 unsigned int fib_flags;
102 unsigned char fib_dead;
103 unsigned char fib_protocol;
104 unsigned char fib_scope;
105 __be32 fib_prefsrc;
106 u32 fib_priority;
107 u32 *fib_metrics;
108#define fib_mtu fib_metrics[RTAX_MTU-1]
109#define fib_window fib_metrics[RTAX_WINDOW-1]
110#define fib_rtt fib_metrics[RTAX_RTT-1]
111#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
112 int fib_nhs;
113#ifdef CONFIG_IP_ROUTE_MULTIPATH
114 int fib_power;
115#endif
116 struct rcu_head rcu;
117 struct fib_nh fib_nh[0];
118#define fib_dev fib_nh[0].nh_dev
119};
120
121
122#ifdef CONFIG_IP_MULTIPLE_TABLES
123struct fib_rule;
124#endif
125
126struct fib_table;
127struct fib_result {
128 unsigned char prefixlen;
129 unsigned char nh_sel;
130 unsigned char type;
131 unsigned char scope;
132 u32 tclassid;
133 struct fib_info *fi;
134 struct fib_table *table;
135 struct list_head *fa_head;
136};
137
138struct fib_result_nl {
139 __be32 fl_addr; /* To be looked up*/
140 u32 fl_mark;
141 unsigned char fl_tos;
142 unsigned char fl_scope;
143 unsigned char tb_id_in;
144
145 unsigned char tb_id; /* Results */
146 unsigned char prefixlen;
147 unsigned char nh_sel;
148 unsigned char type;
149 unsigned char scope;
150 int err;
151};
152
153#ifdef CONFIG_IP_ROUTE_MULTIPATH
154
155#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
156
157#define FIB_TABLE_HASHSZ 2
158
159#else /* CONFIG_IP_ROUTE_MULTIPATH */
160
161#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
162
163#define FIB_TABLE_HASHSZ 256
164
165#endif /* CONFIG_IP_ROUTE_MULTIPATH */
166
167extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
168
169#define FIB_RES_SADDR(net, res) \
170 ((FIB_RES_NH(res).nh_saddr_genid == \
171 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
172 FIB_RES_NH(res).nh_saddr : \
173 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
174#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
175#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
176#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
177
178#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
179 FIB_RES_SADDR(net, res))
180
181struct fib_table {
182 struct hlist_node tb_hlist;
183 u32 tb_id;
184 int tb_default;
185 int tb_num_default;
186 unsigned long tb_data[0];
187};
188
189extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
190 struct fib_result *res, int fib_flags);
191extern int fib_table_insert(struct fib_table *, struct fib_config *);
192extern int fib_table_delete(struct fib_table *, struct fib_config *);
193extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
194 struct netlink_callback *cb);
195extern int fib_table_flush(struct fib_table *table);
196extern void fib_free_table(struct fib_table *tb);
197
198
199
200#ifndef CONFIG_IP_MULTIPLE_TABLES
201
202#define TABLE_LOCAL_INDEX 0
203#define TABLE_MAIN_INDEX 1
204
205static inline struct fib_table *fib_get_table(struct net *net, u32 id)
206{
207 struct hlist_head *ptr;
208
209 ptr = id == RT_TABLE_LOCAL ?
210 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
211 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
212 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
213}
214
215static inline struct fib_table *fib_new_table(struct net *net, u32 id)
216{
217 return fib_get_table(net, id);
218}
219
220static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
221 struct fib_result *res)
222{
223 struct fib_table *table;
224
225 table = fib_get_table(net, RT_TABLE_LOCAL);
226 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
227 return 0;
228
229 table = fib_get_table(net, RT_TABLE_MAIN);
230 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
231 return 0;
232 return -ENETUNREACH;
233}
234
235#else /* CONFIG_IP_MULTIPLE_TABLES */
236extern int __net_init fib4_rules_init(struct net *net);
237extern void __net_exit fib4_rules_exit(struct net *net);
238
239extern struct fib_table *fib_new_table(struct net *net, u32 id);
240extern struct fib_table *fib_get_table(struct net *net, u32 id);
241
242extern int __fib_lookup(struct net *net, struct flowi4 *flp,
243 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[];
271extern void ip_fib_init(void);
272extern __be32 fib_compute_spec_dst(struct sk_buff *skb);
273extern int 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);
276extern void 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 */
290extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
291extern int fib_sync_down_dev(struct net_device *dev, int force);
292extern int fib_sync_down_addr(struct net *net, __be32 local);
293extern void fib_update_nh_saddrs(struct net_device *dev);
294extern int fib_sync_up(struct net_device *dev);
295extern void fib_select_multipath(struct fib_result *res);
296
297/* Exported by fib_trie.c */
298extern void fib_trie_init(void);
299extern struct fib_table *fib_trie_table(u32 id);
300
301static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
302{
303#ifdef CONFIG_IP_ROUTE_CLASSID
304#ifdef CONFIG_IP_MULTIPLE_TABLES
305 u32 rtag;
306#endif
307 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
308#ifdef CONFIG_IP_MULTIPLE_TABLES
309 rtag = res->tclassid;
310 if (*itag == 0)
311 *itag = (rtag<<16);
312 *itag |= (rtag>>16);
313#endif
314#endif
315}
316
317extern void free_fib_info(struct fib_info *fi);
318
319static inline void fib_info_put(struct fib_info *fi)
320{
321 if (atomic_dec_and_test(&fi->fib_clntref))
322 free_fib_info(fi);
323}
324
325#ifdef CONFIG_PROC_FS
326extern int __net_init fib_proc_init(struct net *net);
327extern void __net_exit fib_proc_exit(struct net *net);
328#else
329static inline int fib_proc_init(struct net *net)
330{
331 return 0;
332}
333static inline void fib_proc_exit(struct net *net)
334{
335}
336#endif
337
338#endif /* _NET_FIB_H */