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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;
Nicolas Dichtelef2c7d72012-09-05 02:12:42 +000040 u32 fc_type; /* only 8 bits are used */
Thomas Graf86872cb2006-08-22 00:01:08 -070041
42 struct in6_addr fc_dst;
43 struct in6_addr fc_src;
Daniel Walterc3968a82011-04-13 21:10:57 +000044 struct in6_addr fc_prefsrc;
Thomas Graf86872cb2006-08-22 00:01:08 -070045 struct in6_addr fc_gateway;
46
47 unsigned long fc_expires;
48 struct nlattr *fc_mx;
49 int fc_mx_len;
Nicolas Dichtel51ebd312012-10-22 03:42:09 +000050 int fc_mp_len;
51 struct nlattr *fc_mp;
Thomas Graf86872cb2006-08-22 00:01:08 -070052
53 struct nl_info fc_nlinfo;
54};
55
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000056struct fib6_node {
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 struct fib6_node *parent;
58 struct fib6_node *left;
59 struct fib6_node *right;
Kim Nordlund8bce65b2006-12-13 16:38:29 -080060#ifdef CONFIG_IPV6_SUBTREES
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 struct fib6_node *subtree;
Kim Nordlund8bce65b2006-12-13 16:38:29 -080062#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 struct rt6_info *leaf;
64
65 __u16 fn_bit; /* bit key */
66 __u16 fn_flags;
67 __u32 fn_sernum;
David S. Millerf11e6652007-03-24 20:36:25 -070068 struct rt6_info *rr_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069};
70
YOSHIFUJI Hideaki7fc33162006-08-23 17:22:24 -070071#ifndef CONFIG_IPV6_SUBTREES
72#define FIB6_SUBTREE(fn) NULL
73#else
74#define FIB6_SUBTREE(fn) ((fn)->subtree)
75#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77/*
78 * routing information
79 *
80 */
81
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000082struct rt6key {
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 struct in6_addr addr;
84 int plen;
85};
86
Thomas Grafc71099a2006-08-04 23:20:06 -070087struct fib6_table;
88
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000089struct rt6_info {
Changli Gaod8d1f302010-06-10 23:31:35 -070090 struct dst_entry dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +000092 /*
93 * Tail elements of dst_entry (__refcnt etc.)
94 * and these elements (rarely used in hot path) are in
95 * the same cache line.
96 */
97 struct fib6_table *rt6i_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 struct fib6_node *rt6i_node;
99
100 struct in6_addr rt6i_gateway;
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000101
Nicolas Dichtel51ebd312012-10-22 03:42:09 +0000102 /* Multipath routes:
103 * siblings is a list of rt6_info that have the the same metric/weight,
104 * destination, but not the same gateway. nsiblings is just a cache
105 * to speed up lookup.
106 */
107 struct list_head rt6i_siblings;
108 unsigned int rt6i_nsiblings;
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 atomic_t rt6i_ref;
Herbert Xub4ce9272007-11-13 21:33:32 -0800111
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000112 /* These are in a separate cache line. */
113 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
114 u32 rt6i_flags;
115 struct rt6key rt6i_src;
Daniel Walterc3968a82011-04-13 21:10:57 +0000116 struct rt6key rt6i_prefsrc;
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000117 u32 rt6i_metric;
Herbert Xub4ce9272007-11-13 21:33:32 -0800118
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000119 struct inet6_dev *rt6i_idev;
David S. Miller97bab732012-06-09 22:36:36 -0700120 unsigned long _rt6i_peer;
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700121
Nicolas Dichtel6f3118b2012-09-10 22:09:46 +0000122 u32 rt6i_genid;
123
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000124 /* more non-fragment space at head required */
125 unsigned short rt6i_nfheader_len;
Herbert Xub4ce9272007-11-13 21:33:32 -0800126
YOSHIFUJI Hideaki / 吉藤英明bd2c77a2010-03-31 22:24:22 +0000127 u8 rt6i_protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128};
129
David S. Miller97bab732012-06-09 22:36:36 -0700130static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt)
131{
132 return inetpeer_ptr(rt->_rt6i_peer);
133}
134
135static inline bool rt6_has_peer(struct rt6_info *rt)
136{
137 return inetpeer_ptr_is_peer(rt->_rt6i_peer);
138}
139
140static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
141{
142 __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
143}
144
145static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer)
146{
147 return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer);
148}
149
150static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base)
151{
152 inetpeer_init_ptr(&rt->_rt6i_peer, base);
153}
154
155static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort)
156{
157 inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer);
158}
159
YOSHIFUJI Hideaki7a3025b2006-10-13 16:17:25 +0900160static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
161{
162 return ((struct rt6_info *)dst)->rt6i_idev;
163}
164
Gao feng1716a962012-04-06 00:13:10 +0000165static inline void rt6_clean_expires(struct rt6_info *rt)
166{
Gao feng1716a962012-04-06 00:13:10 +0000167 rt->rt6i_flags &= ~RTF_EXPIRES;
Gao feng1716a962012-04-06 00:13:10 +0000168}
169
170static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
171{
Gao feng1716a962012-04-06 00:13:10 +0000172 rt->dst.expires = expires;
YOSHIFUJI Hideaki / 吉藤英明ecd98832013-02-20 00:29:08 +0000173 rt->rt6i_flags |= RTF_EXPIRES;
Gao feng1716a962012-04-06 00:13:10 +0000174}
175
YOSHIFUJI Hideaki / 吉藤英明ecd98832013-02-20 00:29:08 +0000176static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
Gao feng1716a962012-04-06 00:13:10 +0000177{
YOSHIFUJI Hideaki / 吉藤英明ecd98832013-02-20 00:29:08 +0000178 struct rt6_info *rt;
Gao feng1716a962012-04-06 00:13:10 +0000179
YOSHIFUJI Hideaki / 吉藤英明ecd98832013-02-20 00:29:08 +0000180 for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES);
181 rt = (struct rt6_info *)rt->dst.from);
182 if (rt && rt != rt0)
183 rt0->dst.expires = rt->dst.expires;
184
185 dst_set_expires(&rt0->dst, timeout);
186 rt0->rt6i_flags |= RTF_EXPIRES;
Gao feng1716a962012-04-06 00:13:10 +0000187}
188
189static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
190{
191 struct dst_entry *new = (struct dst_entry *) from;
192
Gao feng1716a962012-04-06 00:13:10 +0000193 rt->rt6i_flags &= ~RTF_EXPIRES;
Gao feng1716a962012-04-06 00:13:10 +0000194 dst_hold(new);
YOSHIFUJI Hideaki / 吉藤英明ecd98832013-02-20 00:29:08 +0000195 rt->dst.from = new;
Gao feng1716a962012-04-06 00:13:10 +0000196}
197
Amerigo Wang94e187c2012-10-29 00:13:19 +0000198static inline void ip6_rt_put(struct rt6_info *rt)
199{
200 /* dst_release() accepts a NULL parameter.
201 * We rely on dst being first structure in struct rt6_info
202 */
203 BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
204 dst_release(&rt->dst);
205}
206
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000207struct fib6_walker_t {
Alexey Dobriyanbbef49d2010-02-18 08:13:30 +0000208 struct list_head lh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 struct fib6_node *root, *node;
210 struct rt6_info *leaf;
211 unsigned char state;
212 unsigned char prune;
Patrick McHardy2bec5a32010-02-08 05:19:03 +0000213 unsigned int skip;
214 unsigned int count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 int (*func)(struct fib6_walker_t *);
216 void *args;
217};
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219struct rt6_statistics {
220 __u32 fib_nodes;
221 __u32 fib_route_nodes;
222 __u32 fib_rt_alloc; /* permanent routes */
223 __u32 fib_rt_entries; /* rt entries in table */
224 __u32 fib_rt_cache; /* cache routes */
225 __u32 fib_discarded_routes;
226};
227
228#define RTN_TL_ROOT 0x0001
229#define RTN_ROOT 0x0002 /* tree root node */
230#define RTN_RTINFO 0x0004 /* node with valid routing info */
231
232/*
233 * priority levels (or metrics)
234 *
235 */
236
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Thomas Grafc71099a2006-08-04 23:20:06 -0700238struct fib6_table {
239 struct hlist_node tb6_hlist;
240 u32 tb6_id;
241 rwlock_t tb6_lock;
242 struct fib6_node tb6_root;
David S. Miller8e773272012-06-11 00:01:52 -0700243 struct inet_peer_base tb6_peers;
Thomas Grafc71099a2006-08-04 23:20:06 -0700244};
245
246#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
247#define RT6_TABLE_MAIN RT_TABLE_MAIN
Thomas Grafc71099a2006-08-04 23:20:06 -0700248#define RT6_TABLE_DFLT RT6_TABLE_MAIN
249#define RT6_TABLE_INFO RT6_TABLE_MAIN
250#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
251
252#ifdef CONFIG_IPV6_MULTIPLE_TABLES
253#define FIB6_TABLE_MIN 1
254#define FIB6_TABLE_MAX RT_TABLE_MAX
Thomas Graf101367c2006-08-04 03:39:02 -0700255#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
Thomas Grafc71099a2006-08-04 23:20:06 -0700256#else
257#define FIB6_TABLE_MIN RT_TABLE_MAIN
258#define FIB6_TABLE_MAX FIB6_TABLE_MIN
Thomas Graf101367c2006-08-04 03:39:02 -0700259#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
Thomas Grafc71099a2006-08-04 23:20:06 -0700260#endif
261
Daniel Lezcano8ed67782008-03-04 13:48:30 -0800262typedef struct rt6_info *(*pol_lookup_t)(struct net *,
263 struct fib6_table *,
David S. Miller4c9483b2011-03-12 16:22:43 -0500264 struct flowi6 *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266/*
267 * exported functions
268 */
269
Daniel Lezcano58f09b72008-03-03 23:25:27 -0800270extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
271extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
272extern struct dst_entry *fib6_rule_lookup(struct net *net,
David S. Miller4c9483b2011-03-12 16:22:43 -0500273 struct flowi6 *fl6, int flags,
Daniel Lezcano58f09b72008-03-03 23:25:27 -0800274 pol_lookup_t lookup);
Thomas Grafc71099a2006-08-04 23:20:06 -0700275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276extern struct fib6_node *fib6_lookup(struct fib6_node *root,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000277 const struct in6_addr *daddr,
278 const struct in6_addr *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
280struct fib6_node *fib6_locate(struct fib6_node *root,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000281 const struct in6_addr *daddr, int dst_len,
282 const struct in6_addr *saddr, int src_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Josh Hunt32b293a2011-12-28 13:23:07 +0000284extern void fib6_clean_all_ro(struct net *net,
285 int (*func)(struct rt6_info *, void *arg),
286 int prune, void *arg);
287
Daniel Lezcanof3db4852008-03-03 23:27:06 -0800288extern void fib6_clean_all(struct net *net,
289 int (*func)(struct rt6_info *, void *arg),
Thomas Grafc71099a2006-08-04 23:20:06 -0700290 int prune, void *arg);
291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292extern int fib6_add(struct fib6_node *root,
293 struct rt6_info *rt,
Thomas Graf86872cb2006-08-22 00:01:08 -0700294 struct nl_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
296extern int fib6_del(struct rt6_info *rt,
Thomas Graf86872cb2006-08-22 00:01:08 -0700297 struct nl_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
299extern void inet6_rt_notify(int event, struct rt6_info *rt,
Thomas Graf86872cb2006-08-22 00:01:08 -0700300 struct nl_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
Daniel Lezcano5b7c9312008-03-03 23:28:58 -0800302extern void fib6_run_gc(unsigned long expires,
Michal Kubeček2ac3ac82013-08-01 10:04:14 +0200303 struct net *net, bool force);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
305extern void fib6_gc_cleanup(void);
306
Daniel Lezcanod63bddb2007-12-07 00:40:34 -0800307extern int fib6_init(void);
Thomas Graf101367c2006-08-04 03:39:02 -0700308
Daniel Lezcano7e5449c2007-12-08 00:14:54 -0800309#ifdef CONFIG_IPV6_MULTIPLE_TABLES
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800310extern int fib6_rules_init(void);
Thomas Graf101367c2006-08-04 03:39:02 -0700311extern void fib6_rules_cleanup(void);
Daniel Lezcano7e5449c2007-12-08 00:14:54 -0800312#else
313static inline int fib6_rules_init(void)
314{
315 return 0;
316}
317static inline void fib6_rules_cleanup(void)
318{
319 return ;
320}
321#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322#endif