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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
16#ifdef __KERNEL__
17
18#include <linux/ipv6_route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/rtnetlink.h>
20#include <linux/spinlock.h>
Thomas Graf86872cb2006-08-22 00:01:08 -070021#include <net/dst.h>
22#include <net/flow.h>
23#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25struct rt6_info;
26
Thomas Graf86872cb2006-08-22 00:01:08 -070027struct fib6_config
28{
29 u32 fc_table;
30 u32 fc_metric;
31 int fc_dst_len;
32 int fc_src_len;
33 int fc_ifindex;
34 u32 fc_flags;
35 u32 fc_protocol;
36
37 struct in6_addr fc_dst;
38 struct in6_addr fc_src;
39 struct in6_addr fc_gateway;
40
41 unsigned long fc_expires;
42 struct nlattr *fc_mx;
43 int fc_mx_len;
44
45 struct nl_info fc_nlinfo;
46};
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048struct fib6_node
49{
50 struct fib6_node *parent;
51 struct fib6_node *left;
52 struct fib6_node *right;
Kim Nordlund8bce65b2006-12-13 16:38:29 -080053#ifdef CONFIG_IPV6_SUBTREES
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 struct fib6_node *subtree;
Kim Nordlund8bce65b2006-12-13 16:38:29 -080055#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 struct rt6_info *leaf;
57
58 __u16 fn_bit; /* bit key */
59 __u16 fn_flags;
60 __u32 fn_sernum;
David S. Millerf11e6652007-03-24 20:36:25 -070061 struct rt6_info *rr_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062};
63
YOSHIFUJI Hideaki7fc33162006-08-23 17:22:24 -070064#ifndef CONFIG_IPV6_SUBTREES
65#define FIB6_SUBTREE(fn) NULL
66#else
67#define FIB6_SUBTREE(fn) ((fn)->subtree)
68#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70/*
71 * routing information
72 *
73 */
74
75struct rt6key
76{
77 struct in6_addr addr;
78 int plen;
79};
80
Thomas Grafc71099a2006-08-04 23:20:06 -070081struct fib6_table;
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083struct rt6_info
84{
85 union {
86 struct dst_entry dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 } u;
88
89 struct inet6_dev *rt6i_idev;
90
91#define rt6i_dev u.dst.dev
92#define rt6i_nexthop u.dst.neighbour
93#define rt6i_expires u.dst.expires
94
95 struct fib6_node *rt6i_node;
96
97 struct in6_addr rt6i_gateway;
98
99 u32 rt6i_flags;
100 u32 rt6i_metric;
101 atomic_t rt6i_ref;
Herbert Xub4ce9272007-11-13 21:33:32 -0800102
103 /* more non-fragment space at head required */
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800104 unsigned short rt6i_nfheader_len;
Herbert Xub4ce9272007-11-13 21:33:32 -0800105
106 u8 rt6i_protocol;
107
Thomas Grafc71099a2006-08-04 23:20:06 -0700108 struct fib6_table *rt6i_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110 struct rt6key rt6i_dst;
Noriaki TAKAMIYAa47ed4c2007-09-06 03:31:25 -0700111
112#ifdef CONFIG_XFRM
113 u32 rt6i_flow_cache_genid;
114#endif
Herbert Xub4ce9272007-11-13 21:33:32 -0800115
116 struct rt6key rt6i_src;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117};
118
YOSHIFUJI Hideaki7a3025b2006-10-13 16:17:25 +0900119static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
120{
121 return ((struct rt6_info *)dst)->rt6i_idev;
122}
123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124struct fib6_walker_t
125{
126 struct fib6_walker_t *prev, *next;
127 struct fib6_node *root, *node;
128 struct rt6_info *leaf;
129 unsigned char state;
130 unsigned char prune;
131 int (*func)(struct fib6_walker_t *);
132 void *args;
133};
134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135struct rt6_statistics {
136 __u32 fib_nodes;
137 __u32 fib_route_nodes;
138 __u32 fib_rt_alloc; /* permanent routes */
139 __u32 fib_rt_entries; /* rt entries in table */
140 __u32 fib_rt_cache; /* cache routes */
141 __u32 fib_discarded_routes;
142};
143
144#define RTN_TL_ROOT 0x0001
145#define RTN_ROOT 0x0002 /* tree root node */
146#define RTN_RTINFO 0x0004 /* node with valid routing info */
147
148/*
149 * priority levels (or metrics)
150 *
151 */
152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Thomas Grafc71099a2006-08-04 23:20:06 -0700154struct fib6_table {
155 struct hlist_node tb6_hlist;
156 u32 tb6_id;
157 rwlock_t tb6_lock;
158 struct fib6_node tb6_root;
159};
160
161#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
162#define RT6_TABLE_MAIN RT_TABLE_MAIN
Thomas Grafc71099a2006-08-04 23:20:06 -0700163#define RT6_TABLE_DFLT RT6_TABLE_MAIN
164#define RT6_TABLE_INFO RT6_TABLE_MAIN
165#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
166
167#ifdef CONFIG_IPV6_MULTIPLE_TABLES
168#define FIB6_TABLE_MIN 1
169#define FIB6_TABLE_MAX RT_TABLE_MAX
Thomas Graf101367c2006-08-04 03:39:02 -0700170#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
Thomas Grafc71099a2006-08-04 23:20:06 -0700171#else
172#define FIB6_TABLE_MIN RT_TABLE_MAIN
173#define FIB6_TABLE_MAX FIB6_TABLE_MIN
Thomas Graf101367c2006-08-04 03:39:02 -0700174#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
Thomas Grafc71099a2006-08-04 23:20:06 -0700175#endif
176
Thomas Grafc71099a2006-08-04 23:20:06 -0700177typedef struct rt6_info *(*pol_lookup_t)(struct fib6_table *,
178 struct flowi *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180/*
181 * exported functions
182 */
183
Daniel Lezcano58f09b72008-03-03 23:25:27 -0800184extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
185extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
186extern struct dst_entry *fib6_rule_lookup(struct net *net,
187 struct flowi *fl, int flags,
188 pol_lookup_t lookup);
Thomas Grafc71099a2006-08-04 23:20:06 -0700189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190extern struct fib6_node *fib6_lookup(struct fib6_node *root,
191 struct in6_addr *daddr,
192 struct in6_addr *saddr);
193
194struct fib6_node *fib6_locate(struct fib6_node *root,
195 struct in6_addr *daddr, int dst_len,
196 struct in6_addr *saddr, int src_len);
197
Daniel Lezcanof3db4852008-03-03 23:27:06 -0800198extern void fib6_clean_all(struct net *net,
199 int (*func)(struct rt6_info *, void *arg),
Thomas Grafc71099a2006-08-04 23:20:06 -0700200 int prune, void *arg);
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202extern int fib6_add(struct fib6_node *root,
203 struct rt6_info *rt,
Thomas Graf86872cb2006-08-22 00:01:08 -0700204 struct nl_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206extern int fib6_del(struct rt6_info *rt,
Thomas Graf86872cb2006-08-22 00:01:08 -0700207 struct nl_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
209extern void inet6_rt_notify(int event, struct rt6_info *rt,
Thomas Graf86872cb2006-08-22 00:01:08 -0700210 struct nl_info *info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
Daniel Lezcano5b7c9312008-03-03 23:28:58 -0800212extern void fib6_run_gc(unsigned long expires,
213 struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
215extern void fib6_gc_cleanup(void);
216
Daniel Lezcanod63bddb2007-12-07 00:40:34 -0800217extern int fib6_init(void);
Thomas Graf101367c2006-08-04 03:39:02 -0700218
Daniel Lezcano7e5449c2007-12-08 00:14:54 -0800219#ifdef CONFIG_IPV6_MULTIPLE_TABLES
Daniel Lezcano9eb87f32007-12-07 00:42:52 -0800220extern int fib6_rules_init(void);
Thomas Graf101367c2006-08-04 03:39:02 -0700221extern void fib6_rules_cleanup(void);
Daniel Lezcano7e5449c2007-12-08 00:14:54 -0800222#else
223static inline int fib6_rules_init(void)
224{
225 return 0;
226}
227static inline void fib6_rules_cleanup(void)
228{
229 return ;
230}
231#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232#endif
233#endif