1 /*
2 * Linux INET6 implementation
3 *
4 * Authors:
5 * Pedro Roque <pedro_m@yahoo.com>
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 u8 rt6i_protocol;
85 };
86
87 struct fib6_walker_t
88 {
89 struct fib6_walker_t *prev, *next;
90 struct fib6_node *root, *node;
91 struct rt6_info *leaf;
92 unsigned char state;
93 unsigned char prune;
94 int (*func)(struct fib6_walker_t *);
95 void *args;
96 };
97
98 extern struct fib6_walker_t fib6_walker_list;
99 extern rwlock_t fib6_walker_lock;
100
fib6_walker_link(struct fib6_walker_t * w)101 static inline void fib6_walker_link(struct fib6_walker_t *w)
102 {
103 write_lock_bh(&fib6_walker_lock);
104 w->next = fib6_walker_list.next;
105 w->prev = &fib6_walker_list;
106 w->next->prev = w;
107 w->prev->next = w;
108 write_unlock_bh(&fib6_walker_lock);
109 }
110
fib6_walker_unlink(struct fib6_walker_t * w)111 static inline void fib6_walker_unlink(struct fib6_walker_t *w)
112 {
113 write_lock_bh(&fib6_walker_lock);
114 w->next->prev = w->prev;
115 w->prev->next = w->next;
116 w->prev = w->next = w;
117 write_unlock_bh(&fib6_walker_lock);
118 }
119
120 struct rt6_statistics {
121 __u32 fib_nodes;
122 __u32 fib_route_nodes;
123 __u32 fib_rt_alloc; /* permanent routes */
124 __u32 fib_rt_entries; /* rt entries in table */
125 __u32 fib_rt_cache; /* cache routes */
126 };
127
128 #define RTN_TL_ROOT 0x0001
129 #define RTN_ROOT 0x0002 /* tree root node */
130 #define RTN_RTINFO 0x0004 /* node with valid routing info */
131
132 /*
133 * priority levels (or metrics)
134 *
135 */
136
137 #define RTPRI_FIREWALL 8 /* Firewall control information */
138 #define RTPRI_FLOW 16 /* Flow based forwarding rules */
139 #define RTPRI_KERN_CTL 32 /* Kernel control routes */
140
141 #define RTPRI_USER_MIN 256 /* Mimimum user priority */
142 #define RTPRI_USER_MAX 1024 /* Maximum user priority */
143
144 #define RTPRI_KERN_DFLT 4096 /* Kernel default routes */
145
146 #define MAX_FLOW_BACKTRACE 32
147
148
149 typedef void (*f_pnode)(struct fib6_node *fn, void *);
150
151 extern struct fib6_node ip6_routing_table;
152
153 /*
154 * exported functions
155 */
156
157 extern struct fib6_node *fib6_lookup(struct fib6_node *root,
158 struct in6_addr *daddr,
159 struct in6_addr *saddr);
160
161 struct fib6_node *fib6_locate(struct fib6_node *root,
162 struct in6_addr *daddr, int dst_len,
163 struct in6_addr *saddr, int src_len);
164
165 extern void fib6_clean_tree(struct fib6_node *root,
166 int (*func)(struct rt6_info *, void *arg),
167 int prune, void *arg);
168
169 extern int fib6_walk(struct fib6_walker_t *w);
170 extern int fib6_walk_continue(struct fib6_walker_t *w);
171
172 extern int fib6_add(struct fib6_node *root,
173 struct rt6_info *rt,
174 struct nlmsghdr *nlh,
175 struct netlink_skb_parms *req);
176
177 extern int fib6_del(struct rt6_info *rt,
178 struct nlmsghdr *nlh,
179 struct netlink_skb_parms *req);
180
181 extern void inet6_rt_notify(int event, struct rt6_info *rt,
182 struct nlmsghdr *nlh,
183 struct netlink_skb_parms *req);
184
185 extern void fib6_run_gc(unsigned long dummy);
186
187 extern void fib6_gc_cleanup(void);
188
189 extern void fib6_init(void);
190 #endif
191 #endif
192