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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>
David S. Miller4895c772012-07-17 04:19:00 -070021#include <linux/rcupdate.h>
Thomas Grafe1ef4bf2006-08-04 03:39:22 -070022#include <net/fib_rules.h>
David S. Miller8e773272012-06-11 00:01:52 -070023#include <net/inetpeer.h>
Eric Dumazetd26b3a72012-07-31 05:45:30 +000024#include <linux/percpu.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Thomas Graf4e902c52006-08-17 18:14:52 -070026struct fib_config {
Thomas Graf4e902c52006-08-17 18:14:52 -070027 u8 fc_dst_len;
Thomas Graf4e902c52006-08-17 18:14:52 -070028 u8 fc_tos;
29 u8 fc_protocol;
30 u8 fc_scope;
31 u8 fc_type;
Thomas Grafb52f0702006-10-18 20:26:36 -070032 /* 3 bytes unused */
Thomas Graf4e902c52006-08-17 18:14:52 -070033 u32 fc_table;
Al Viro6d85c102006-09-26 22:15:46 -070034 __be32 fc_dst;
Al Viro6d85c102006-09-26 22:15:46 -070035 __be32 fc_gw;
Thomas Graf4e902c52006-08-17 18:14:52 -070036 int fc_oif;
37 u32 fc_flags;
38 u32 fc_priority;
Al Viro6d85c102006-09-26 22:15:46 -070039 __be32 fc_prefsrc;
Thomas Graf4e902c52006-08-17 18:14:52 -070040 struct nlattr *fc_mx;
41 struct rtnexthop *fc_mp;
42 int fc_mx_len;
43 int fc_mp_len;
44 u32 fc_flow;
Thomas Graf4e902c52006-08-17 18:14:52 -070045 u32 fc_nlflags;
46 struct nl_info fc_nlinfo;
47 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49struct fib_info;
David S. Millerf2bb4be2012-07-17 12:20:47 -070050struct rtable;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
David S. Miller4895c772012-07-17 04:19:00 -070052struct fib_nh_exception {
53 struct fib_nh_exception __rcu *fnhe_next;
54 __be32 fnhe_daddr;
55 u32 fnhe_pmtu;
Julian Anastasovaee06da2012-07-18 10:15:35 +000056 __be32 fnhe_gw;
David S. Miller4895c772012-07-17 04:19:00 -070057 unsigned long fnhe_expires;
David S. Millerc5038a82012-07-31 15:02:02 -070058 struct rtable __rcu *fnhe_rth;
David S. Miller4895c772012-07-17 04:19:00 -070059 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070069struct fib_nh {
70 struct net_device *nh_dev;
71 struct hlist_node nh_hash;
72 struct fib_info *nh_parent;
Eric Dumazet95c96172012-04-15 05:58:06 +000073 unsigned int nh_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 unsigned char nh_scope;
75#ifdef CONFIG_IP_ROUTE_MULTIPATH
76 int nh_weight;
77 int nh_power;
78#endif
Patrick McHardyc7066f72011-01-14 13:36:42 +010079#ifdef CONFIG_IP_ROUTE_CLASSID
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 __u32 nh_tclassid;
81#endif
82 int nh_oif;
Al Viroed49e3c2006-09-26 22:13:54 -070083 __be32 nh_gw;
David S. Miller1fc050a2011-03-07 20:54:48 -080084 __be32 nh_saddr;
David S. Miller436c3b62011-03-24 17:42:21 -070085 int nh_saddr_genid;
Eric Dumazetd26b3a72012-07-31 05:45:30 +000086 struct rtable __rcu * __percpu *nh_pcpu_rth_output;
Eric Dumazet54764bb2012-07-31 01:08:23 +000087 struct rtable __rcu *nh_rth_input;
David S. Miller4895c772012-07-17 04:19:00 -070088 struct fnhe_hash_bucket *nh_exceptions;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089};
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;
Denis V. Lunev7462bd742008-01-31 18:49:32 -080098 struct net *fib_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 int fib_treeref;
100 atomic_t fib_clntref;
Eric Dumazet95c96172012-04-15 05:58:06 +0000101 unsigned int fib_flags;
David S. Miller37e826c2011-03-24 18:06:47 -0700102 unsigned char fib_dead;
103 unsigned char fib_protocol;
104 unsigned char fib_scope;
Eric Dumazetf4ef85b2012-10-04 01:25:26 +0000105 unsigned char fib_type;
Al Virob83738a2006-09-26 22:14:15 -0700106 __be32 fib_prefsrc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 u32 fib_priority;
David S. Miller9c150e82011-01-28 14:01:25 -0800108 u32 *fib_metrics;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109#define fib_mtu fib_metrics[RTAX_MTU-1]
110#define fib_window fib_metrics[RTAX_WINDOW-1]
111#define fib_rtt fib_metrics[RTAX_RTT-1]
112#define fib_advmss fib_metrics[RTAX_ADVMSS-1]
113 int fib_nhs;
114#ifdef CONFIG_IP_ROUTE_MULTIPATH
115 int fib_power;
116#endif
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000117 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 struct fib_nh fib_nh[0];
119#define fib_dev fib_nh[0].nh_dev
120};
121
122
123#ifdef CONFIG_IP_MULTIPLE_TABLES
124struct fib_rule;
125#endif
126
David S. Miller5b470442011-01-31 16:10:03 -0800127struct fib_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128struct fib_result {
129 unsigned char prefixlen;
130 unsigned char nh_sel;
131 unsigned char type;
132 unsigned char scope;
David S. Miller85b91b02012-07-13 08:21:29 -0700133 u32 tclassid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 struct fib_info *fi;
David S. Miller5b470442011-01-31 16:10:03 -0800135 struct fib_table *table;
136 struct list_head *fa_head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137};
138
Robert Olsson246955f2005-06-20 13:36:39 -0700139struct fib_result_nl {
Al Viro80e856e2006-09-26 22:19:36 -0700140 __be32 fl_addr; /* To be looked up*/
Thomas Graf5f3008932006-11-09 15:21:41 -0800141 u32 fl_mark;
Robert Olsson246955f2005-06-20 13:36:39 -0700142 unsigned char fl_tos;
143 unsigned char fl_scope;
144 unsigned char tb_id_in;
145
146 unsigned char tb_id; /* Results */
147 unsigned char prefixlen;
148 unsigned char nh_sel;
149 unsigned char type;
150 unsigned char scope;
151 int err;
152};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154#ifdef CONFIG_IP_ROUTE_MULTIPATH
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155#define FIB_RES_NH(res) ((res).fi->fib_nh[(res).nh_sel])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156#else /* CONFIG_IP_ROUTE_MULTIPATH */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157#define FIB_RES_NH(res) ((res).fi->fib_nh[0])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158#endif /* CONFIG_IP_ROUTE_MULTIPATH */
159
Denis V. Lunev5b9e12d2013-03-13 00:24:15 +0000160#ifdef CONFIG_IP_MULTIPLE_TABLES
161#define FIB_TABLE_HASHSZ 256
162#else
163#define FIB_TABLE_HASHSZ 2
164#endif
165
David S. Miller436c3b62011-03-24 17:42:21 -0700166extern __be32 fib_info_update_nh_saddr(struct net *net, struct fib_nh *nh);
167
168#define FIB_RES_SADDR(net, res) \
169 ((FIB_RES_NH(res).nh_saddr_genid == \
170 atomic_read(&(net)->ipv4.dev_addr_genid)) ? \
171 FIB_RES_NH(res).nh_saddr : \
172 fib_info_update_nh_saddr((net), &FIB_RES_NH(res)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173#define FIB_RES_GW(res) (FIB_RES_NH(res).nh_gw)
174#define FIB_RES_DEV(res) (FIB_RES_NH(res).nh_dev)
175#define FIB_RES_OIF(res) (FIB_RES_NH(res).nh_oif)
176
David S. Miller436c3b62011-03-24 17:42:21 -0700177#define FIB_RES_PREFSRC(net, res) ((res).fi->fib_prefsrc ? : \
178 FIB_RES_SADDR(net, res))
David S. Miller1fc050a2011-03-07 20:54:48 -0800179
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180struct fib_table {
David S. Miller8e773272012-06-11 00:01:52 -0700181 struct hlist_node tb_hlist;
182 u32 tb_id;
183 int tb_default;
184 int tb_num_default;
David S. Miller8e773272012-06-11 00:01:52 -0700185 unsigned long tb_data[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186};
187
David S. Miller22bd5b92011-03-11 19:54:08 -0500188extern int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp,
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000189 struct fib_result *res, int fib_flags);
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000190extern int fib_table_insert(struct fib_table *, struct fib_config *);
191extern int fib_table_delete(struct fib_table *, struct fib_config *);
192extern int fib_table_dump(struct fib_table *table, struct sk_buff *skb,
193 struct netlink_callback *cb);
194extern int fib_table_flush(struct fib_table *table);
Pavel Emelyanov4aa2c462010-10-28 02:00:43 +0000195extern void fib_free_table(struct fib_table *tb);
196
Stephen Hemminger16c6cf82009-09-20 10:35:36 +0000197
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199#ifndef CONFIG_IP_MULTIPLE_TABLES
200
Denis V. Lunev93456b62008-01-10 03:23:38 -0800201#define TABLE_LOCAL_INDEX 0
202#define TABLE_MAIN_INDEX 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800204static inline struct fib_table *fib_get_table(struct net *net, u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
Denis V. Lunev93456b62008-01-10 03:23:38 -0800206 struct hlist_head *ptr;
207
208 ptr = id == RT_TABLE_LOCAL ?
Denis V. Luneve4aef8a2008-01-10 03:28:24 -0800209 &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
210 &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
Denis V. Lunev93456b62008-01-10 03:23:38 -0800211 return hlist_entry(ptr->first, struct fib_table, tb_hlist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212}
213
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800214static inline struct fib_table *fib_new_table(struct net *net, u32 id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215{
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800216 return fib_get_table(net, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217}
218
David S. Miller22bd5b92011-03-11 19:54:08 -0500219static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800220 struct fib_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221{
Denis V. Lunev93456b62008-01-10 03:23:38 -0800222 struct fib_table *table;
223
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800224 table = fib_get_table(net, RT_TABLE_LOCAL);
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000225 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
Denis V. Lunev93456b62008-01-10 03:23:38 -0800226 return 0;
227
Denis V. Lunevda0e28c2008-01-21 17:31:55 -0800228 table = fib_get_table(net, RT_TABLE_MAIN);
Eric Dumazetebc0ffa2010-10-05 10:41:36 +0000229 if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
Denis V. Lunev93456b62008-01-10 03:23:38 -0800230 return 0;
231 return -ENETUNREACH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232}
233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234#else /* CONFIG_IP_MULTIPLE_TABLES */
Denis V. Lunev7b1a74f2008-01-10 03:22:17 -0800235extern int __net_init fib4_rules_init(struct net *net);
236extern void __net_exit fib4_rules_exit(struct net *net);
Pavel Emelyanovc3e9a352007-11-06 23:34:04 -0800237
Denis V. Lunev8ad49422008-01-10 03:24:11 -0800238extern struct fib_table *fib_new_table(struct net *net, u32 id);
239extern struct fib_table *fib_get_table(struct net *net, u32 id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
David S. Millerf4530fa2012-07-05 22:13:13 -0700241extern int __fib_lookup(struct net *net, struct flowi4 *flp,
242 struct fib_result *res);
243
244static inline int fib_lookup(struct net *net, struct flowi4 *flp,
245 struct fib_result *res)
246{
247 if (!net->ipv4.fib_has_custom_rules) {
David S. Miller85b91b02012-07-13 08:21:29 -0700248 res->tclassid = 0;
David S. Millerf4530fa2012-07-05 22:13:13 -0700249 if (net->ipv4.fib_local &&
250 !fib_table_lookup(net->ipv4.fib_local, flp, res,
251 FIB_LOOKUP_NOREF))
252 return 0;
253 if (net->ipv4.fib_main &&
254 !fib_table_lookup(net->ipv4.fib_main, flp, res,
255 FIB_LOOKUP_NOREF))
256 return 0;
257 if (net->ipv4.fib_default &&
258 !fib_table_lookup(net->ipv4.fib_default, flp, res,
259 FIB_LOOKUP_NOREF))
260 return 0;
261 return -ENETUNREACH;
262 }
263 return __fib_lookup(net, flp, res);
264}
265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266#endif /* CONFIG_IP_MULTIPLE_TABLES */
267
268/* Exported by fib_frontend.c */
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700269extern const struct nla_policy rtm_ipv4_policy[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270extern void ip_fib_init(void);
David S. Miller35ebf652012-06-28 03:59:11 -0700271extern __be32 fib_compute_spec_dst(struct sk_buff *skb);
Michael Smith5c04c812011-04-07 04:51:50 +0000272extern int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
273 u8 tos, int oif, struct net_device *dev,
David S. Miller9e56e382012-06-28 18:54:02 -0700274 struct in_device *idev, u32 *itag);
David S. Miller0c838ff2011-01-31 16:16:50 -0800275extern void fib_select_default(struct fib_result *res);
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700276#ifdef CONFIG_IP_ROUTE_CLASSID
David S. Millerf4530fa2012-07-05 22:13:13 -0700277static inline int fib_num_tclassid_users(struct net *net)
278{
279 return net->ipv4.fib_num_tclassid_users;
280}
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700281#else
David S. Millerf4530fa2012-07-05 22:13:13 -0700282static inline int fib_num_tclassid_users(struct net *net)
283{
284 return 0;
285}
David S. Miller7a9bc9b2012-06-29 01:32:45 -0700286#endif
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200287
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288/* Exported by fib_semantics.c */
Al Virod878e72e2006-09-26 22:18:13 -0700289extern int ip_fib_check_default(__be32 gw, struct net_device *dev);
Denis V. Lunev85326fa2008-01-31 18:48:47 -0800290extern int fib_sync_down_dev(struct net_device *dev, int force);
Denis V. Lunev4814bdb2008-01-31 18:50:07 -0800291extern int fib_sync_down_addr(struct net *net, __be32 local);
David S. Miller1fc050a2011-03-07 20:54:48 -0800292extern void fib_update_nh_saddrs(struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293extern int fib_sync_up(struct net_device *dev);
David S. Miller1b7fe5932011-03-10 17:01:16 -0800294extern void fib_select_multipath(struct fib_result *res);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
David S. Miller5348ba82011-02-01 15:30:56 -0800296/* Exported by fib_trie.c */
297extern void fib_trie_init(void);
298extern struct fib_table *fib_trie_table(u32 id);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
David S. Millerb6bf3ca2011-02-16 22:04:57 -0800300static inline void fib_combine_itag(u32 *itag, const struct fib_result *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
Patrick McHardyc7066f72011-01-14 13:36:42 +0100302#ifdef CONFIG_IP_ROUTE_CLASSID
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303#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
David S. Miller85b91b02012-07-13 08:21:29 -0700308 rtag = res->tclassid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 if (*itag == 0)
310 *itag = (rtag<<16);
311 *itag |= (rtag>>16);
312#endif
313#endif
314}
315
316extern void 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
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300324#ifdef CONFIG_PROC_FS
Denis V. Lunev61a02652008-01-10 03:21:09 -0800325extern int __net_init fib_proc_init(struct net *net);
326extern void __net_exit fib_proc_exit(struct net *net);
Li Zefancc8274f2008-02-05 02:54:16 -0800327#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}
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -0300335#endif
336
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337#endif /* _NET_FIB_H */