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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
David S. Miller97cac082012-07-02 22:43:47 -070089 struct neighbour *n;
90
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +000091 /*
92 * Tail elements of dst_entry (__refcnt etc.)
93 * and these elements (rarely used in hot path) are in
94 * the same cache line.
95 */
96 struct fib6_table *rt6i_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 struct fib6_node *rt6i_node;
98
99 struct in6_addr rt6i_gateway;
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 atomic_t rt6i_ref;
Herbert Xub4ce9272007-11-13 21:33:32 -0800102
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000103 /* These are in a separate cache line. */
104 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
105 u32 rt6i_flags;
106 struct rt6key rt6i_src;
Daniel Walterc3968a82011-04-13 21:10:57 +0000107 struct rt6key rt6i_prefsrc;
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000108 u32 rt6i_metric;
David S. Miller6431cbc2011-02-07 20:38:06 -0800109 u32 rt6i_peer_genid;
Herbert Xub4ce9272007-11-13 21:33:32 -0800110
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000111 struct inet6_dev *rt6i_idev;
David S. Miller97bab732012-06-09 22:36:36 -0700112 unsigned long _rt6i_peer;
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700113
114#ifdef CONFIG_XFRM
115 u32 rt6i_flow_cache_genid;
116#endif
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000117 /* more non-fragment space at head required */
118 unsigned short rt6i_nfheader_len;
Herbert Xub4ce9272007-11-13 21:33:32 -0800119
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000120 u8 rt6i_protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121};
122
David S. Miller97bab732012-06-09 22:36:36 -0700123static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
124{
125 return inetpeer_ptr(rt->_rt6i_peer);
126}
127
128static inline bool rt6_has_peer(struct rt6_info *rt)
129{
130 return inetpeer_ptr_is_peer(rt->_rt6i_peer);
131}
132
133static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
134{
135 __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
136}
137
138static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
139{
140 return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
141}
142
143static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
144{
145 inetpeer_init_ptr(&rt->_rt6i_peer, base);
146}
147
148static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
149{
150 inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);
151}
152
YOSHIFUJI Hideaki7a3025b2006-10-13 16:17:25 +0900153static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
154{
155 return ((struct rt6_info *)dst)->rt6i_idev;
156}
157
Gao feng1716a962012-04-06 00:13:10 +0000158static inline void rt6_clean_expires(struct rt6_info *rt)
159{
160 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
161 dst_release(rt->dst.from);
162
163 rt->rt6i_flags &= ~RTF_EXPIRES;
Jiri Bohaccda31e12012-04-16 03:35:41 +0000164 rt->dst.from = NULL;
Gao feng1716a962012-04-06 00:13:10 +0000165}
166
167static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
168{
169 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
170 dst_release(rt->dst.from);
171
172 rt->rt6i_flags |= RTF_EXPIRES;
173 rt->dst.expires = expires;
174}
175
176static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
177{
Jiri Bohacedfb5d42012-04-16 03:34:39 +0000178 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
179 if (rt->dst.from)
180 dst_release(rt->dst.from);
181 /* dst_set_expires relies on expires == 0
182 * if it has not been set previously.
183 */
184 rt->dst.expires = 0;
185 }
Gao feng1716a962012-04-06 00:13:10 +0000186
187 dst_set_expires(&rt->dst, timeout);
188 rt->rt6i_flags |= RTF_EXPIRES;
189}
190
191static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
192{
193 struct dst_entry *new = (struct dst_entry *) from;
194
195 if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) {
196 if (new == rt->dst.from)
197 return;
198 dst_release(rt->dst.from);
199 }
200
201 rt->rt6i_flags &= ~RTF_EXPIRES;
202 rt->dst.from = new;
203 dst_hold(new);
204}
205
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000206struct fib6_walker_t {
Alexey Dobriyanbbef49d2010-02-18 08:13:30 +0000207 struct list_head lh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 struct fib6_node *root, *node;
209 struct rt6_info *leaf;
210 unsigned char state;
211 unsigned char prune;
Patrick McHardy2bec5a32010-02-08 05:19:03 +0000212 unsigned int skip;
213 unsigned int count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 int (*func)(struct fib6_walker_t *);
215 void *args;
216};
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218struct rt6_statistics {
219 __u32 fib_nodes;
220 __u32 fib_route_nodes;
221 __u32 fib_rt_alloc; /* permanent routes */
222 __u32 fib_rt_entries; /* rt entries in table */
223 __u32 fib_rt_cache; /* cache routes */
224 __u32 fib_discarded_routes;
225};
226
227#define RTN_TL_ROOT 0x0001
228#define RTN_ROOT 0x0002 /* tree root node */
229#define RTN_RTINFO 0x0004 /* node with valid routing info */
230
231/*
232 * priority levels (or metrics)
233 *
234 */
235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
Thomas Grafc71099a2006-08-04 23:20:06 -0700237struct fib6_table {
238 struct hlist_node tb6_hlist;
239 u32 tb6_id;
240 rwlock_t tb6_lock;
241 struct fib6_node tb6_root;
David S. Miller8e773272012-06-11 00:01:52 -0700242 struct inet_peer_base tb6_peers;
Thomas Grafc71099a2006-08-04 23:20:06 -0700243};
244
245#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
246#define RT6_TABLE_MAIN RT_TABLE_MAIN
Thomas Grafc71099a2006-08-04 23:20:06 -0700247#define RT6_TABLE_DFLT RT6_TABLE_MAIN
248#define RT6_TABLE_INFO RT6_TABLE_MAIN
249#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
250
251#ifdef CONFIG_IPV6_MULTIPLE_TABLES
252#define FIB6_TABLE_MIN 1
253#define FIB6_TABLE_MAX RT_TABLE_MAX
Thomas Graf101367c2006-08-04 03:39:02 -0700254#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
Thomas Grafc71099a2006-08-04 23:20:06 -0700255#else
256#define FIB6_TABLE_MIN RT_TABLE_MAIN
257#define FIB6_TABLE_MAX FIB6_TABLE_MIN
Thomas Graf101367c2006-08-04 03:39:02 -0700258#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
Thomas Grafc71099a2006-08-04 23:20:06 -0700259#endif
260
Daniel Lezcano8ed67782008-03-04 13:48:30 -0800261typedef struct rt6_info *(*pol_lookup_t)(struct net *,
262 struct fib6_table *,
David S. Miller4c9483b2011-03-12 16:22:43 -0500263 struct flowi6 *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
265/*
266 * exported functions
267 */
268
Daniel Lezcano58f09b72008-03-03 23:25:27 -0800269extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
270extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
271extern struct dst_entry *fib6_rule_lookup(struct net *net,
David S. Miller4c9483b2011-03-12 16:22:43 -0500272 struct flowi6 *fl6, int flags,
Daniel Lezcano58f09b72008-03-03 23:25:27 -0800273 pol_lookup_t lookup);
Thomas Grafc71099a2006-08-04 23:20:06 -0700274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275extern struct fib6_node *fib6_lookup(struct fib6_node *root,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000276 const struct in6_addr *daddr,
277 const struct in6_addr *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279struct fib6_node *fib6_locate(struct fib6_node *root,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000280 const struct in6_addr *daddr, int dst_len,
281 const struct in6_addr *saddr, int src_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Josh Hunt32b293a2011-12-28 13:23:07 +0000283extern void fib6_clean_all_ro(struct net *net,
284 int (*func)(struct rt6_info *, void *arg),
285 int prune, void *arg);
286
Daniel Lezcanof3db4852008-03-03 23:27:06 -0800287extern void fib6_clean_all(struct net *net,
288 int (*func)(struct rt6_info *, void *arg),
Thomas Grafc71099a2006-08-04 23:20:06 -0700289 int prune, void *arg);
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291extern int fib6_add(struct fib6_node *root,
292 struct rt6_info *rt,
Thomas Graf86872cb2006-08-22 00:01:08 -0700293 struct nl_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295extern int fib6_del(struct rt6_info *rt,
Thomas Graf86872cb2006-08-22 00:01:08 -0700296 struct nl_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
298extern void inet6_rt_notify(int event, struct rt6_info *rt,
Thomas Graf86872cb2006-08-22 00:01:08 -0700299 struct nl_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
Daniel Lezcano5b7c9312008-03-03 23:28:58 -0800301extern void fib6_run_gc(unsigned long expires,
302 struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304extern void fib6_gc_cleanup(void);
305
Daniel Lezcanod63bddb2007-12-07 00:40:34 -0800306extern int fib6_init(void);
Thomas Graf101367c2006-08-04 03:39:02 -0700307
Daniel Lezcano7e5449c2007-12-08 00:14:54 -0800308#ifdef CONFIG_IPV6_MULTIPLE_TABLES
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800309extern int fib6_rules_init(void);
Thomas Graf101367c2006-08-04 03:39:02 -0700310extern void fib6_rules_cleanup(void);
Daniel Lezcano7e5449c2007-12-08 00:14:54 -0800311#else
312static inline int fib6_rules_init(void)
313{
314 return 0;
315}
316static inline void fib6_rules_cleanup(void)
317{
318 return ;
319}
320#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321#endif