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[linux-2.6/next.git] / include / net / ip6_fib.h
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1 /*
2 * Linux INET6 implementation
4 * Authors:
5 * Pedro Roque <roque@di.fc.ul.pt>
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.
13 #ifndef _IP6_FIB_H
14 #define _IP6_FIB_H
16 #include <linux/ipv6_route.h>
17 #include <linux/rtnetlink.h>
18 #include <linux/spinlock.h>
19 #include <net/dst.h>
20 #include <net/flow.h>
21 #include <net/netlink.h>
22 #include <net/inetpeer.h>
24 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
25 #define FIB6_TABLE_HASHSZ 256
26 #else
27 #define FIB6_TABLE_HASHSZ 1
28 #endif
30 struct rt6_info;
32 struct fib6_config {
33 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;
41 struct in6_addr fc_dst;
42 struct in6_addr fc_src;
43 struct in6_addr fc_prefsrc;
44 struct in6_addr fc_gateway;
46 unsigned long fc_expires;
47 struct nlattr *fc_mx;
48 int fc_mx_len;
50 struct nl_info fc_nlinfo;
53 struct fib6_node {
54 struct fib6_node *parent;
55 struct fib6_node *left;
56 struct fib6_node *right;
57 #ifdef CONFIG_IPV6_SUBTREES
58 struct fib6_node *subtree;
59 #endif
60 struct rt6_info *leaf;
62 __u16 fn_bit; /* bit key */
63 __u16 fn_flags;
64 __u32 fn_sernum;
65 struct rt6_info *rr_ptr;
68 #ifndef CONFIG_IPV6_SUBTREES
69 #define FIB6_SUBTREE(fn) NULL
70 #else
71 #define FIB6_SUBTREE(fn) ((fn)->subtree)
72 #endif
75 * routing information
79 struct rt6key {
80 struct in6_addr addr;
81 int plen;
84 struct fib6_table;
86 struct rt6_info {
87 struct dst_entry dst;
89 #define rt6i_dev dst.dev
90 #define rt6i_nexthop dst.neighbour
91 #define rt6i_expires dst.expires
94 * Tail elements of dst_entry (__refcnt etc.)
95 * and these elements (rarely used in hot path) are in
96 * the same cache line.
98 struct fib6_table *rt6i_table;
99 struct fib6_node *rt6i_node;
101 struct in6_addr rt6i_gateway;
103 atomic_t rt6i_ref;
105 /* These are in a separate cache line. */
106 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
107 u32 rt6i_flags;
108 struct rt6key rt6i_src;
109 struct rt6key rt6i_prefsrc;
110 u32 rt6i_metric;
111 u32 rt6i_peer_genid;
113 struct inet6_dev *rt6i_idev;
114 struct inet_peer *rt6i_peer;
116 #ifdef CONFIG_XFRM
117 u32 rt6i_flow_cache_genid;
118 #endif
119 /* more non-fragment space at head required */
120 unsigned short rt6i_nfheader_len;
122 u8 rt6i_protocol;
125 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
127 return ((struct rt6_info *)dst)->rt6i_idev;
130 struct fib6_walker_t {
131 struct list_head lh;
132 struct fib6_node *root, *node;
133 struct rt6_info *leaf;
134 unsigned char state;
135 unsigned char prune;
136 unsigned int skip;
137 unsigned int count;
138 int (*func)(struct fib6_walker_t *);
139 void *args;
142 struct rt6_statistics {
143 __u32 fib_nodes;
144 __u32 fib_route_nodes;
145 __u32 fib_rt_alloc; /* permanent routes */
146 __u32 fib_rt_entries; /* rt entries in table */
147 __u32 fib_rt_cache; /* cache routes */
148 __u32 fib_discarded_routes;
151 #define RTN_TL_ROOT 0x0001
152 #define RTN_ROOT 0x0002 /* tree root node */
153 #define RTN_RTINFO 0x0004 /* node with valid routing info */
156 * priority levels (or metrics)
161 struct fib6_table {
162 struct hlist_node tb6_hlist;
163 u32 tb6_id;
164 rwlock_t tb6_lock;
165 struct fib6_node tb6_root;
168 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
169 #define RT6_TABLE_MAIN RT_TABLE_MAIN
170 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
171 #define RT6_TABLE_INFO RT6_TABLE_MAIN
172 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
174 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
175 #define FIB6_TABLE_MIN 1
176 #define FIB6_TABLE_MAX RT_TABLE_MAX
177 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
178 #else
179 #define FIB6_TABLE_MIN RT_TABLE_MAIN
180 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
181 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
182 #endif
184 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
185 struct fib6_table *,
186 struct flowi6 *, int);
189 * exported functions
192 extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
193 extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
194 extern struct dst_entry *fib6_rule_lookup(struct net *net,
195 struct flowi6 *fl6, int flags,
196 pol_lookup_t lookup);
198 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
199 const struct in6_addr *daddr,
200 const struct in6_addr *saddr);
202 struct fib6_node *fib6_locate(struct fib6_node *root,
203 const struct in6_addr *daddr, int dst_len,
204 const struct in6_addr *saddr, int src_len);
206 extern void fib6_clean_all(struct net *net,
207 int (*func)(struct rt6_info *, void *arg),
208 int prune, void *arg);
210 extern int fib6_add(struct fib6_node *root,
211 struct rt6_info *rt,
212 struct nl_info *info);
214 extern int fib6_del(struct rt6_info *rt,
215 struct nl_info *info);
217 extern void inet6_rt_notify(int event, struct rt6_info *rt,
218 struct nl_info *info);
220 extern void fib6_run_gc(unsigned long expires,
221 struct net *net);
223 extern void fib6_gc_cleanup(void);
225 extern int fib6_init(void);
227 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
228 extern int fib6_rules_init(void);
229 extern void fib6_rules_cleanup(void);
230 #else
231 static inline int fib6_rules_init(void)
233 return 0;
235 static inline void fib6_rules_cleanup(void)
237 return ;
239 #endif
240 #endif