Btrfs: release space on error in page_mkwrite
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / net / ip6_fib.h
blob5735a0f979c379a769c980fdc302ac73825f0d88
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_expires dst.expires
93 * Tail elements of dst_entry (__refcnt etc.)
94 * and these elements (rarely used in hot path) are in
95 * the same cache line.
97 struct fib6_table *rt6i_table;
98 struct fib6_node *rt6i_node;
100 struct in6_addr rt6i_gateway;
102 atomic_t rt6i_ref;
104 /* These are in a separate cache line. */
105 struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
106 u32 rt6i_flags;
107 struct rt6key rt6i_src;
108 struct rt6key rt6i_prefsrc;
109 u32 rt6i_metric;
110 u32 rt6i_peer_genid;
112 struct inet6_dev *rt6i_idev;
113 struct inet_peer *rt6i_peer;
115 #ifdef CONFIG_XFRM
116 u32 rt6i_flow_cache_genid;
117 #endif
118 /* more non-fragment space at head required */
119 unsigned short rt6i_nfheader_len;
121 u8 rt6i_protocol;
124 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
126 return ((struct rt6_info *)dst)->rt6i_idev;
129 struct fib6_walker_t {
130 struct list_head lh;
131 struct fib6_node *root, *node;
132 struct rt6_info *leaf;
133 unsigned char state;
134 unsigned char prune;
135 unsigned int skip;
136 unsigned int count;
137 int (*func)(struct fib6_walker_t *);
138 void *args;
141 struct rt6_statistics {
142 __u32 fib_nodes;
143 __u32 fib_route_nodes;
144 __u32 fib_rt_alloc; /* permanent routes */
145 __u32 fib_rt_entries; /* rt entries in table */
146 __u32 fib_rt_cache; /* cache routes */
147 __u32 fib_discarded_routes;
150 #define RTN_TL_ROOT 0x0001
151 #define RTN_ROOT 0x0002 /* tree root node */
152 #define RTN_RTINFO 0x0004 /* node with valid routing info */
155 * priority levels (or metrics)
160 struct fib6_table {
161 struct hlist_node tb6_hlist;
162 u32 tb6_id;
163 rwlock_t tb6_lock;
164 struct fib6_node tb6_root;
167 #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
168 #define RT6_TABLE_MAIN RT_TABLE_MAIN
169 #define RT6_TABLE_DFLT RT6_TABLE_MAIN
170 #define RT6_TABLE_INFO RT6_TABLE_MAIN
171 #define RT6_TABLE_PREFIX RT6_TABLE_MAIN
173 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
174 #define FIB6_TABLE_MIN 1
175 #define FIB6_TABLE_MAX RT_TABLE_MAX
176 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
177 #else
178 #define FIB6_TABLE_MIN RT_TABLE_MAIN
179 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
180 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
181 #endif
183 typedef struct rt6_info *(*pol_lookup_t)(struct net *,
184 struct fib6_table *,
185 struct flowi6 *, int);
188 * exported functions
191 extern struct fib6_table *fib6_get_table(struct net *net, u32 id);
192 extern struct fib6_table *fib6_new_table(struct net *net, u32 id);
193 extern struct dst_entry *fib6_rule_lookup(struct net *net,
194 struct flowi6 *fl6, int flags,
195 pol_lookup_t lookup);
197 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
198 const struct in6_addr *daddr,
199 const struct in6_addr *saddr);
201 struct fib6_node *fib6_locate(struct fib6_node *root,
202 const struct in6_addr *daddr, int dst_len,
203 const struct in6_addr *saddr, int src_len);
205 extern void fib6_clean_all(struct net *net,
206 int (*func)(struct rt6_info *, void *arg),
207 int prune, void *arg);
209 extern int fib6_add(struct fib6_node *root,
210 struct rt6_info *rt,
211 struct nl_info *info);
213 extern int fib6_del(struct rt6_info *rt,
214 struct nl_info *info);
216 extern void inet6_rt_notify(int event, struct rt6_info *rt,
217 struct nl_info *info);
219 extern void fib6_run_gc(unsigned long expires,
220 struct net *net);
222 extern void fib6_gc_cleanup(void);
224 extern int fib6_init(void);
226 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
227 extern int fib6_rules_init(void);
228 extern void fib6_rules_cleanup(void);
229 #else
230 static inline int fib6_rules_init(void)
232 return 0;
234 static inline void fib6_rules_cleanup(void)
236 return ;
238 #endif
239 #endif