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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <net/flow.h>
20#include <linux/seq_file.h>
Thomas Grafe1ef4bf2006-08-04 03:39:22 -070021#include <net/fib_rules.h>
David S. Miller8e773272012-06-11 00:01:52 -070022#include <net/inetpeer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Thomas Graf4e902c52006-08-17 18:14:52 -070024struct fib_config {
Thomas Graf4e902c52006-08-17 18:14:52 -070025 u8 fc_dst_len;
Thomas Graf4e902c52006-08-17 18:14:52 -070026 u8 fc_tos;
27 u8 fc_protocol;
28 u8 fc_scope;
29 u8 fc_type;
Thomas Grafb52f0702006-10-18 20:26:36 -070030 /* 3 bytes unused */
Thomas Graf4e902c52006-08-17 18:14:52 -070031 u32 fc_table;
Al Viro6d85c102006-09-26 22:15:46 -070032 __be32 fc_dst;
Al Viro6d85c102006-09-26 22:15:46 -070033 __be32 fc_gw;
Thomas Graf4e902c52006-08-17 18:14:52 -070034 int fc_oif;
35 u32 fc_flags;
36 u32 fc_priority;
Al Viro6d85c102006-09-26 22:15:46 -070037 __be32 fc_prefsrc;
Thomas Graf4e902c52006-08-17 18:14:52 -070038 struct nlattr *fc_mx;
39 struct rtnexthop *fc_mp;
40 int fc_mx_len;
41 int fc_mp_len;
42 u32 fc_flow;
Thomas Graf4e902c52006-08-17 18:14:52 -070043 u32 fc_nlflags;
44 struct nl_info fc_nlinfo;
45 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47struct fib_info;
48
49struct fib_nh {
50 struct net_device *nh_dev;
51 struct hlist_node nh_hash;
52 struct fib_info *nh_parent;
Eric Dumazet95c96172012-04-15 05:58:06 +000053 unsigned int nh_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 unsigned char nh_scope;
55#ifdef CONFIG_IP_ROUTE_MULTIPATH
56 int nh_weight;
57 int nh_power;
58#endif
Patrick McHardyc7066f72011-01-14 13:36:42 +010059#ifdef CONFIG_IP_ROUTE_CLASSID
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 __u32 nh_tclassid;
61#endif
62 int nh_oif;
Al Viroed49e3c2006-09-26 22:13:54 -070063 __be32 nh_gw;
David S. Miller1fc050a2011-03-07 20:54:48 -080064 __be32 nh_saddr;
David S. Miller436c3b62011-03-24 17:42:21 -070065 int nh_saddr_genid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066};
67
68/*
69 * This structure contains data shared by many of routes.
70 */
71
72struct fib_info {
73 struct hlist_node fib_hash;
74 struct hlist_node fib_lhash;
Denis V. Lunev7462bd742008-01-31 18:49:32 -080075 struct net *fib_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 int fib_treeref;
77 atomic_t fib_clntref;
Eric Dumazet95c96172012-04-15 05:58:06 +000078 unsigned int fib_flags;
David S. Miller37e826c2011-03-24 18:06:47 -070079 unsigned char fib_dead;
80 unsigned char fib_protocol;
81 unsigned char fib_scope;
Al Virob83738a2006-09-26 22:14:15 -070082 __be32 fib_prefsrc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 u32 fib_priority;
David S. Miller9c150e82011-01-28 14:01:25 -080084 u32 *fib_metrics;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#define fib_mtu fib_metrics[RTAX_MTU-1]
86#define fib_window fib_metrics[RTAX_WINDOW-1]
87#define fib_rtt fib_metrics[RTAX_RTT-1]
88#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
89 int fib_nhs;
90#ifdef CONFIG_IP_ROUTE_MULTIPATH
91 int fib_power;
92#endif
Eric Dumazetebc0ffa2010-10-05 10:41:36 +000093 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 struct fib_nh fib_nh[0];
95#define fib_dev fib_nh[0].nh_dev
96};
97
98
99#ifdef CONFIG_IP_MULTIPLE_TABLES
100struct fib_rule;
101#endif
102
David S. Miller5b470442011-01-31 16:10:03 -0800103struct fib_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104struct fib_result {
105 unsigned char prefixlen;
106 unsigned char nh_sel;
107 unsigned char type;
108 unsigned char scope;
David S. Miller85b91b02012-07-13 08:21:29 -0700109 u32 tclassid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 struct fib_info *fi;
David S. Miller5b470442011-01-31 16:10:03 -0800111 struct fib_table *table;
112 struct list_head *fa_head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113};
114
Robert Olsson246955f2005-06-20 13:36:39 -0700115struct fib_result_nl {
Al Viro80e856e2006-09-26 22:19:36 -0700116 __be32 fl_addr; /* To be looked up*/
Thomas Graf5f3008932006-11-09 15:21:41 -0800117 u32 fl_mark;
Robert Olsson246955f2005-06-20 13:36:39 -0700118 unsigned char fl_tos;
119 unsigned char fl_scope;
120 unsigned char tb_id_in;
121
122 unsigned char tb_id; /* Results */
123 unsigned char prefixlen;
124 unsigned char nh_sel;
125 unsigned char type;
126 unsigned char scope;
127 int err;
128};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130#ifdef CONFIG_IP_ROUTE_MULTIPATH
131
132#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Denis V. Lunev93456b62008-01-10 03:23:38 -0800134#define FIB_TABLE_HASHSZ 2
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136#else /* CONFIG_IP_ROUTE_MULTIPATH */
137
138#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Denis V. Lunev93456b62008-01-10 03:23:38 -0800140#define FIB_TABLE_HASHSZ 256
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142#endif /* CONFIG_IP_ROUTE_MULTIPATH */
143
David S. Miller436c3b62011-03-24 17:42:21 -0700144extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
145
146#define FIB_RES_SADDR(net, res) \
147 ((FIB_RES_NH(res).nh_saddr_genid == \
148 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
149 FIB_RES_NH(res).nh_saddr : \
150 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
152#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
153#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
154
David S. Miller436c3b62011-03-24 17:42:21 -0700155#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
156 FIB_RES_SADDR(net, res))
David S. Miller1fc050a2011-03-07 20:54:48 -0800157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158struct fib_table {
David S. Miller8e773272012-06-11 00:01:52 -0700159 struct hlist_node tb_hlist;
160 u32 tb_id;
161 int tb_default;
162 int tb_num_default;
David S. Miller8e773272012-06-11 00:01:52 -0700163 unsigned long tb_data[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164};
165
David S. Miller22bd5b92011-03-11 19:54:08 -0500166extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000167 struct fib_result *res, int fib_flags);
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000168extern 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);
Pavel Emelyanov4aa2c462010-10-28 02:00:43 +0000173extern void fib_free_table(struct fib_table *tb);
174
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000175
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177#ifndef CONFIG_IP_MULTIPLE_TABLES
178
Denis V. Lunev93456b62008-01-10 03:23:38 -0800179#define TABLE_LOCAL_INDEX 0
180#define TABLE_MAIN_INDEX 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800182static inline struct fib_table *fib_get_table(struct net *net, u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
Denis V. Lunev93456b62008-01-10 03:23:38 -0800184 struct hlist_head *ptr;
185
186 ptr = id == RT_TABLE_LOCAL ?
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800187 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
188 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
Denis V. Lunev93456b62008-01-10 03:23:38 -0800189 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800192static inline struct fib_table *fib_new_table(struct net *net, u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800194 return fib_get_table(net, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195}
196
David S. Miller22bd5b92011-03-11 19:54:08 -0500197static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800198 struct fib_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199{
Denis V. Lunev93456b62008-01-10 03:23:38 -0800200 struct fib_table *table;
201
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800202 table = fib_get_table(net, RT_TABLE_LOCAL);
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000203 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
Denis V. Lunev93456b62008-01-10 03:23:38 -0800204 return 0;
205
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800206 table = fib_get_table(net, RT_TABLE_MAIN);
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000207 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
Denis V. Lunev93456b62008-01-10 03:23:38 -0800208 return 0;
209 return -ENETUNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210}
211
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212#else /* CONFIG_IP_MULTIPLE_TABLES */
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -0800213extern int __net_init fib4_rules_init(struct net *net);
214extern void __net_exit fib4_rules_exit(struct net *net);
Pavel Emelyanovc3e9a352007-11-06 23:34:04 -0800215
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800216extern struct fib_table *fib_new_table(struct net *net, u32 id);
217extern struct fib_table *fib_get_table(struct net *net, u32 id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
David S. Millerf4530fa2012-07-05 22:13:13 -0700219extern int __fib_lookup(struct net *net, struct flowi4 *flp,
220 struct fib_result *res);
221
222static inline int fib_lookup(struct net *net, struct flowi4 *flp,
223 struct fib_result *res)
224{
225 if (!net->ipv4.fib_has_custom_rules) {
David S. Miller85b91b02012-07-13 08:21:29 -0700226 res->tclassid = 0;
David S. Millerf4530fa2012-07-05 22:13:13 -0700227 if (net->ipv4.fib_local &&
228 !fib_table_lookup(net->ipv4.fib_local, flp, res,
229 FIB_LOOKUP_NOREF))
230 return 0;
231 if (net->ipv4.fib_main &&
232 !fib_table_lookup(net->ipv4.fib_main, flp, res,
233 FIB_LOOKUP_NOREF))
234 return 0;
235 if (net->ipv4.fib_default &&
236 !fib_table_lookup(net->ipv4.fib_default, flp, res,
237 FIB_LOOKUP_NOREF))
238 return 0;
239 return -ENETUNREACH;
240 }
241 return __fib_lookup(net, flp, res);
242}
243
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244#endif /* CONFIG_IP_MULTIPLE_TABLES */
245
246/* Exported by fib_frontend.c */
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700247extern const struct nla_policy rtm_ipv4_policy[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248extern void ip_fib_init(void);
David S. Miller35ebf652012-06-28 03:59:11 -0700249extern __be32 fib_compute_spec_dst(struct sk_buff *skb);
Michael Smith5c04c812011-04-07 04:51:50 +0000250extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
251 u8 tos, int oif, struct net_device *dev,
David S. Miller9e56e382012-06-28 18:54:02 -0700252 struct in_device *idev, u32 *itag);
David S. Miller0c838ff2011-01-31 16:16:50 -0800253extern void fib_select_default(struct fib_result *res);
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700254#ifdef CONFIG_IP_ROUTE_CLASSID
David S. Millerf4530fa2012-07-05 22:13:13 -0700255static inline int fib_num_tclassid_users(struct net *net)
256{
257 return net->ipv4.fib_num_tclassid_users;
258}
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700259#else
David S. Millerf4530fa2012-07-05 22:13:13 -0700260static inline int fib_num_tclassid_users(struct net *net)
261{
262 return 0;
263}
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700264#endif
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266/* Exported by fib_semantics.c */
Al Virod878e72e2006-09-26 22:18:13 -0700267extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
Denis V. Lunev85326fa2008-01-31 18:48:47 -0800268extern int fib_sync_down_dev(struct net_device *dev, int force);
Denis V. Lunev4814bdb2008-01-31 18:50:07 -0800269extern int fib_sync_down_addr(struct net *net, __be32 local);
David S. Miller1fc050a2011-03-07 20:54:48 -0800270extern void fib_update_nh_saddrs(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271extern int fib_sync_up(struct net_device *dev);
David S. Miller1b7fe5932011-03-10 17:01:16 -0800272extern void fib_select_multipath(struct fib_result *res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
David S. Miller5348ba82011-02-01 15:30:56 -0800274/* Exported by fib_trie.c */
275extern void fib_trie_init(void);
276extern struct fib_table *fib_trie_table(u32 id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
David S. Millerb6bf3ca2011-02-16 22:04:57 -0800278static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279{
Patrick McHardyc7066f72011-01-14 13:36:42 +0100280#ifdef CONFIG_IP_ROUTE_CLASSID
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281#ifdef CONFIG_IP_MULTIPLE_TABLES
282 u32 rtag;
283#endif
284 *itag = FIB_RES_NH(*res).nh_tclassid<<16;
285#ifdef CONFIG_IP_MULTIPLE_TABLES
David S. Miller85b91b02012-07-13 08:21:29 -0700286 rtag = res->tclassid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 if (*itag == 0)
288 *itag = (rtag<<16);
289 *itag |= (rtag>>16);
290#endif
291#endif
292}
293
294extern void free_fib_info(struct fib_info *fi);
295
296static inline void fib_info_put(struct fib_info *fi)
297{
298 if (atomic_dec_and_test(&fi->fib_clntref))
299 free_fib_info(fi);
300}
301
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300302#ifdef CONFIG_PROC_FS
Denis V. Lunev61a02652008-01-10 03:21:09 -0800303extern int __net_init fib_proc_init(struct net *net);
304extern void __net_exit fib_proc_exit(struct net *net);
Li Zefancc8274f2008-02-05 02:54:16 -0800305#else
306static inline int fib_proc_init(struct net *net)
307{
308 return 0;
309}
310static inline void fib_proc_exit(struct net *net)
311{
312}
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300313#endif
314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315#endif /* _NET_FIB_H */