1 /*
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>
19 #include <linux/rtnetlink.h>
20 #include <linux/spinlock.h>
21 #include <net/dst.h>
22 #include <net/flow.h>
23 #include <net/netlink.h>
24
25 struct rt6_info;
26
27 struct 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
48 struct fib6_node
49 {
50 struct fib6_node *parent;
51 struct fib6_node *left;
52 struct fib6_node *right;
53 #ifdef CONFIG_IPV6_SUBTREES
54 struct fib6_node *subtree;
55 #endif
56 struct rt6_info *leaf;
57
58 __u16 fn_bit; /* bit key */
59 __u16 fn_flags;
60 __u32 fn_sernum;
61 struct rt6_info *rr_ptr;
62 };
63
64 #ifndef CONFIG_IPV6_SUBTREES
65 #define FIB6_SUBTREE(fn) NULL
66 #else
67 #define FIB6_SUBTREE(fn) ((fn)->subtree)
68 #endif
69
70 /*
71 * routing information
72 *
73 */
74
75 struct rt6key
76 {
77 struct in6_addr addr;
78 int plen;
79 };
80
81 struct fib6_table;
82
83 struct rt6_info
84 {
85 union {
86 struct dst_entry dst;
87 } 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;
102
103 /* more non-fragment space at head required */
104 unsigned short rt6i_nfheader_len;
105
106 u8 rt6i_protocol;
107
108 struct fib6_table *rt6i_table;
109
110 struct rt6key rt6i_dst;
111
112 #ifdef CONFIG_XFRM
113 u32 rt6i_flow_cache_genid;
114 #endif
115
116 struct rt6key rt6i_src;
117 };
118
119 static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
120 {
121 return ((struct rt6_info *)dst)->rt6i_idev;
122 }
123
124 struct 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
135 struct 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
153
154 struct 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
163 #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
170 #define RT6_TABLE_LOCAL RT_TABLE_LOCAL
171 #else
172 #define FIB6_TABLE_MIN RT_TABLE_MAIN
173 #define FIB6_TABLE_MAX FIB6_TABLE_MIN
174 #define RT6_TABLE_LOCAL RT6_TABLE_MAIN
175 #endif
176
177 typedef struct rt6_info *(*pol_lookup_t)(struct fib6_table *,
178 struct flowi *, int);
179
180 /*
181 * exported functions
182 */
183
184 extern struct fib6_table * fib6_get_table(u32 id);
185 extern struct fib6_table * fib6_new_table(u32 id);
186 extern struct dst_entry * fib6_rule_lookup(struct flowi *fl, int flags,
187 pol_lookup_t lookup);
188
189 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
190 struct in6_addr *daddr,
191 struct in6_addr *saddr);
192
193 struct fib6_node *fib6_locate(struct fib6_node *root,
194 struct in6_addr *daddr, int dst_len,
195 struct in6_addr *saddr, int src_len);
196
197 extern void fib6_clean_all(int (*func)(struct rt6_info *, void *arg),
198 int prune, void *arg);
199
200 extern int fib6_add(struct fib6_node *root,
201 struct rt6_info *rt,
202 struct nl_info *info);
203
204 extern int fib6_del(struct rt6_info *rt,
205 struct nl_info *info);
206
207 extern void inet6_rt_notify(int event, struct rt6_info *rt,
208 struct nl_info *info);
209
210 extern void fib6_run_gc(unsigned long dummy);
211
212 extern void fib6_gc_cleanup(void);
213
214 extern int fib6_init(void);
215
216 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
217 extern int fib6_rules_init(void);
218 extern void fib6_rules_cleanup(void);
219 #else
220 static inline int fib6_rules_init(void)
221 {
222 return 0;
223 }
224 static inline void fib6_rules_cleanup(void)
225 {
226 return ;
227 }
228 #endif
229 #endif
230 #endif
231
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