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
20 #include <net/dst.h>
21 #include <net/flow.h>
22 #include <linux/rtnetlink.h>
23
24 struct rt6_info;
25
26 struct fib6_node
27 {
28 struct fib6_node *parent;
29 struct fib6_node *left;
30 struct fib6_node *right;
31
32 struct fib6_node *subtree;
33
34 struct rt6_info *leaf;
35
36 __u16 fn_bit; /* bit key */
37 __u16 fn_flags;
38 __u32 fn_sernum;
39 };
40
41
42 /*
43 * routing information
44 *
45 */
46
47 struct rt6key
48 {
49 struct in6_addr addr;
50 int plen;
51 };
52
53 struct rt6_info
54 {
55 union {
56 struct dst_entry dst;
57 struct rt6_info *next;
58 } u;
59
60 #define rt6i_dev u.dst.dev
61 #define rt6i_nexthop u.dst.neighbour
62 #define rt6i_expires u.dst.expires
63
64 struct fib6_node *rt6i_node;
65
66 struct in6_addr rt6i_gateway;
67
68 u32 rt6i_flags;
69 u32 rt6i_metric;
70 u8 rt6i_hoplimit;
71 atomic_t rt6i_ref;
72
73 union {
74 struct flow_rule *rt6iu_flowr;
75 struct flow_filter *rt6iu_filter;
76 } flow_u;
77
78 #define rt6i_flowr flow_u.rt6iu_flowr
79 #define rt6i_filter flow_u.rt6iu_filter
80
81 struct rt6key rt6i_dst;
82 struct rt6key rt6i_src;
83 };
84
85 struct fib6_walker_t
86 {
87 struct fib6_walker_t *prev, *next;
88 struct fib6_node *root, *node;
89 struct rt6_info *leaf;
90 unsigned char state;
91 unsigned char prune;
92 int (*func)(struct fib6_walker_t *);
93 void *args;
94 };
95
96 extern struct fib6_walker_t fib6_walker_list;
97 extern rwlock_t fib6_walker_lock;
98
99 static inline void fib6_walker_link(struct fib6_walker_t *w)
100 {
101 write_lock_bh(&fib6_walker_lock);
102 w->next = fib6_walker_list.next;
103 w->prev = &fib6_walker_list;
104 w->next->prev = w;
105 w->prev->next = w;
106 write_unlock_bh(&fib6_walker_lock);
107 }
108
109 static inline void fib6_walker_unlink(struct fib6_walker_t *w)
110 {
111 write_lock_bh(&fib6_walker_lock);
112 w->next->prev = w->prev;
113 w->prev->next = w->next;
114 w->prev = w->next = w;
115 write_unlock_bh(&fib6_walker_lock);
116 }
117
118 struct rt6_statistics {
119 __u32 fib_nodes;
120 __u32 fib_route_nodes;
121 __u32 fib_rt_alloc; /* permanet routes */
122 __u32 fib_rt_entries; /* rt entries in table */
123 __u32 fib_rt_cache; /* cache routes */
124 };
125
126 #define RTN_TL_ROOT 0x0001
127 #define RTN_ROOT 0x0002 /* tree root node */
128 #define RTN_RTINFO 0x0004 /* node with valid routing info */
129
130 /*
131 * priority levels (or metrics)
132 *
133 */
134
135 #define RTPRI_FIREWALL 8 /* Firewall control information */
136 #define RTPRI_FLOW 16 /* Flow based forwarding rules */
137 #define RTPRI_KERN_CTL 32 /* Kernel control routes */
138
139 #define RTPRI_USER_MIN 256 /* Mimimum user priority */
140 #define RTPRI_USER_MAX 1024 /* Maximum user priority */
141
142 #define RTPRI_KERN_DFLT 4096 /* Kernel default routes */
143
144 #define MAX_FLOW_BACKTRACE 32
145
146
147 typedef void (*f_pnode)(struct fib6_node *fn, void *);
148
149 extern struct fib6_node ip6_routing_table;
150
151 /*
152 * exported functions
153 */
154
155 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
156 struct in6_addr *daddr,
157 struct in6_addr *saddr);
158
159 struct fib6_node *fib6_locate(struct fib6_node *root,
160 struct in6_addr *daddr, int dst_len,
161 struct in6_addr *saddr, int src_len);
162
163 extern void fib6_clean_tree(struct fib6_node *root,
164 int (*func)(struct rt6_info *, void *arg),
165 int prune, void *arg);
166
167 extern int fib6_walk(struct fib6_walker_t *w);
168 extern int fib6_walk_continue(struct fib6_walker_t *w);
169
170 extern int fib6_add(struct fib6_node *root,
171 struct rt6_info *rt);
172
173 extern int fib6_del(struct rt6_info *rt);
174
175 extern void inet6_rt_notify(int event, struct rt6_info *rt);
176
177 extern void fib6_run_gc(unsigned long dummy);
178
179 extern void fib6_gc_cleanup(void);
180
181 extern void fib6_init(void);
182 #endif
183 #endif
184
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