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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Linux INET6 implementation
3 *
4 * Authors:
5 * Pedro Roque <roque@di.fc.ul.pt>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#ifndef _IP6_FIB_H
14#define _IP6_FIB_H
15
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/ipv6_route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/rtnetlink.h>
18#include <linux/spinlock.h>
Thomas Graf86872cb2006-08-22 00:01:08 -070019#include <net/dst.h>
20#include <net/flow.h>
21#include <net/netlink.h>
David S. Millerb3419362010-11-30 12:27:11 -080022#include <net/inetpeer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Neil Hormana33bc5c2009-07-30 18:52:15 -070024#ifdef CONFIG_IPV6_MULTIPLE_TABLES
25#define FIB6_TABLE_HASHSZ 256
26#else
27#define FIB6_TABLE_HASHSZ 1
28#endif
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030struct rt6_info;
31
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000032struct fib6_config {
Thomas Graf86872cb2006-08-22 00:01:08 -070033 u32 fc_table;
34 u32 fc_metric;
35 int fc_dst_len;
36 int fc_src_len;
37 int fc_ifindex;
38 u32 fc_flags;
39 u32 fc_protocol;
40
41 struct in6_addr fc_dst;
42 struct in6_addr fc_src;
Daniel Walterc3968a82011-04-13 21:10:57 +000043 struct in6_addr fc_prefsrc;
Thomas Graf86872cb2006-08-22 00:01:08 -070044 struct in6_addr fc_gateway;
45
46 unsigned long fc_expires;
47 struct nlattr *fc_mx;
48 int fc_mx_len;
49
50 struct nl_info fc_nlinfo;
51};
52
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000053struct fib6_node {
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 struct fib6_node *parent;
55 struct fib6_node *left;
56 struct fib6_node *right;
Kim Nordlund8bce65b2006-12-13 16:38:29 -080057#ifdef CONFIG_IPV6_SUBTREES
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 struct fib6_node *subtree;
Kim Nordlund8bce65b2006-12-13 16:38:29 -080059#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 struct rt6_info *leaf;
61
62 __u16 fn_bit; /* bit key */
63 __u16 fn_flags;
64 __u32 fn_sernum;
David S. Millerf11e6652007-03-24 20:36:25 -070065 struct rt6_info *rr_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066};
67
YOSHIFUJI Hideaki7fc33162006-08-23 17:22:24 -070068#ifndef CONFIG_IPV6_SUBTREES
69#define FIB6_SUBTREE(fn) NULL
70#else
71#define FIB6_SUBTREE(fn) ((fn)->subtree)
72#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74/*
75 * routing information
76 *
77 */
78
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000079struct rt6key {
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 struct in6_addr addr;
81 int plen;
82};
83
Thomas Grafc71099a2006-08-04 23:20:06 -070084struct fib6_table;
85
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000086struct rt6_info {
Changli Gaod8d1f302010-06-10 23:31:35 -070087 struct dst_entry dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +000089 /*
90 * Tail elements of dst_entry (__refcnt etc.)
91 * and these elements (rarely used in hot path) are in
92 * the same cache line.
93 */
94 struct fib6_table *rt6i_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 struct fib6_node *rt6i_node;
96
97 struct in6_addr rt6i_gateway;
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +000098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 atomic_t rt6i_ref;
Herbert Xub4ce9272007-11-13 21:33:32 -0800100
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000101 /* These are in a separate cache line. */
102 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
103 u32 rt6i_flags;
104 struct rt6key rt6i_src;
Daniel Walterc3968a82011-04-13 21:10:57 +0000105 struct rt6key rt6i_prefsrc;
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000106 u32 rt6i_metric;
David S. Miller6431cbc2011-02-07 20:38:06 -0800107 u32 rt6i_peer_genid;
Herbert Xub4ce9272007-11-13 21:33:32 -0800108
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000109 struct inet6_dev *rt6i_idev;
David S. Millerb3419362010-11-30 12:27:11 -0800110 struct inet_peer *rt6i_peer;
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700111
112#ifdef CONFIG_XFRM
113 u32 rt6i_flow_cache_genid;
114#endif
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000115 /* more non-fragment space at head required */
116 unsigned short rt6i_nfheader_len;
Herbert Xub4ce9272007-11-13 21:33:32 -0800117
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000118 u8 rt6i_protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119};
120
YOSHIFUJI Hideaki7a3025b2006-10-13 16:17:25 +0900121static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
122{
123 return ((struct rt6_info *)dst)->rt6i_idev;
124}
125
Gao feng1716a962012-04-06 00:13:10 +0000126static inline void rt6_clean_expires(struct rt6_info *rt)
127{
128 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
129 dst_release(rt->dst.from);
130
131 rt->rt6i_flags &= ~RTF_EXPIRES;
Jiri Bohaccda31e12012-04-16 03:35:41 +0000132 rt->dst.from = NULL;
Gao feng1716a962012-04-06 00:13:10 +0000133}
134
135static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
136{
137 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
138 dst_release(rt->dst.from);
139
140 rt->rt6i_flags |= RTF_EXPIRES;
141 rt->dst.expires = expires;
142}
143
144static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
145{
Jiri Bohacedfb5d42012-04-16 03:34:39 +0000146 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
147 if (rt->dst.from)
148 dst_release(rt->dst.from);
149 /* dst_set_expires relies on expires == 0
150 * if it has not been set previously.
151 */
152 rt->dst.expires = 0;
153 }
Gao feng1716a962012-04-06 00:13:10 +0000154
155 dst_set_expires(&rt->dst, timeout);
156 rt->rt6i_flags |= RTF_EXPIRES;
157}
158
159static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
160{
161 struct dst_entry *new = (struct dst_entry *) from;
162
163 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
164 if (new == rt->dst.from)
165 return;
166 dst_release(rt->dst.from);
167 }
168
169 rt->rt6i_flags &= ~RTF_EXPIRES;
170 rt->dst.from = new;
171 dst_hold(new);
172}
173
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000174struct fib6_walker_t {
Alexey Dobriyanbbef49d2010-02-18 08:13:30 +0000175 struct list_head lh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 struct fib6_node *root, *node;
177 struct rt6_info *leaf;
178 unsigned char state;
179 unsigned char prune;
Patrick McHardy2bec5a32010-02-08 05:19:03 +0000180 unsigned int skip;
181 unsigned int count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 int (*func)(struct fib6_walker_t *);
183 void *args;
184};
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186struct rt6_statistics {
187 __u32 fib_nodes;
188 __u32 fib_route_nodes;
189 __u32 fib_rt_alloc; /* permanent routes */
190 __u32 fib_rt_entries; /* rt entries in table */
191 __u32 fib_rt_cache; /* cache routes */
192 __u32 fib_discarded_routes;
193};
194
195#define RTN_TL_ROOT 0x0001
196#define RTN_ROOT 0x0002 /* tree root node */
197#define RTN_RTINFO 0x0004 /* node with valid routing info */
198
199/*
200 * priority levels (or metrics)
201 *
202 */
203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
Thomas Grafc71099a2006-08-04 23:20:06 -0700205struct fib6_table {
206 struct hlist_node tb6_hlist;
207 u32 tb6_id;
208 rwlock_t tb6_lock;
209 struct fib6_node tb6_root;
210};
211
212#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
213#define RT6_TABLE_MAIN RT_TABLE_MAIN
Thomas Grafc71099a2006-08-04 23:20:06 -0700214#define RT6_TABLE_DFLT RT6_TABLE_MAIN
215#define RT6_TABLE_INFO RT6_TABLE_MAIN
216#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
217
218#ifdef CONFIG_IPV6_MULTIPLE_TABLES
219#define FIB6_TABLE_MIN 1
220#define FIB6_TABLE_MAX RT_TABLE_MAX
Thomas Graf101367c2006-08-04 03:39:02 -0700221#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
Thomas Grafc71099a2006-08-04 23:20:06 -0700222#else
223#define FIB6_TABLE_MIN RT_TABLE_MAIN
224#define FIB6_TABLE_MAX FIB6_TABLE_MIN
Thomas Graf101367c2006-08-04 03:39:02 -0700225#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
Thomas Grafc71099a2006-08-04 23:20:06 -0700226#endif
227
Daniel Lezcano8ed67782008-03-04 13:48:30 -0800228typedef struct rt6_info *(*pol_lookup_t)(struct net *,
229 struct fib6_table *,
David S. Miller4c9483b2011-03-12 16:22:43 -0500230 struct flowi6 *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232/*
233 * exported functions
234 */
235
Daniel Lezcano58f09b72008-03-03 23:25:27 -0800236extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
237extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
238extern struct dst_entry *fib6_rule_lookup(struct net *net,
David S. Miller4c9483b2011-03-12 16:22:43 -0500239 struct flowi6 *fl6, int flags,
Daniel Lezcano58f09b72008-03-03 23:25:27 -0800240 pol_lookup_t lookup);
Thomas Grafc71099a2006-08-04 23:20:06 -0700241
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242extern struct fib6_node *fib6_lookup(struct fib6_node *root,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000243 const struct in6_addr *daddr,
244 const struct in6_addr *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
246struct fib6_node *fib6_locate(struct fib6_node *root,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000247 const struct in6_addr *daddr, int dst_len,
248 const struct in6_addr *saddr, int src_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Josh Hunt32b293a2011-12-28 13:23:07 +0000250extern void fib6_clean_all_ro(struct net *net,
251 int (*func)(struct rt6_info *, void *arg),
252 int prune, void *arg);
253
Daniel Lezcanof3db4852008-03-03 23:27:06 -0800254extern void fib6_clean_all(struct net *net,
255 int (*func)(struct rt6_info *, void *arg),
Thomas Grafc71099a2006-08-04 23:20:06 -0700256 int prune, void *arg);
257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258extern int fib6_add(struct fib6_node *root,
259 struct rt6_info *rt,
Thomas Graf86872cb2006-08-22 00:01:08 -0700260 struct nl_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262extern int fib6_del(struct rt6_info *rt,
Thomas Graf86872cb2006-08-22 00:01:08 -0700263 struct nl_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
265extern void inet6_rt_notify(int event, struct rt6_info *rt,
Thomas Graf86872cb2006-08-22 00:01:08 -0700266 struct nl_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Daniel Lezcano5b7c9312008-03-03 23:28:58 -0800268extern void fib6_run_gc(unsigned long expires,
269 struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271extern void fib6_gc_cleanup(void);
272
Daniel Lezcanod63bddb2007-12-07 00:40:34 -0800273extern int fib6_init(void);
Thomas Graf101367c2006-08-04 03:39:02 -0700274
Daniel Lezcano7e5449c2007-12-08 00:14:54 -0800275#ifdef CONFIG_IPV6_MULTIPLE_TABLES
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800276extern int fib6_rules_init(void);
Thomas Graf101367c2006-08-04 03:39:02 -0700277extern void fib6_rules_cleanup(void);
Daniel Lezcano7e5449c2007-12-08 00:14:54 -0800278#else
279static inline int fib6_rules_init(void)
280{
281 return 0;
282}
283static inline void fib6_rules_cleanup(void)
284{
285 return ;
286}
287#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288#endif