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1da177e4 LT |
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 | #include <linux/spinlock.h> | |
24 | ||
25 | struct rt6_info; | |
26 | ||
27 | struct fib6_node | |
28 | { | |
29 | struct fib6_node *parent; | |
30 | struct fib6_node *left; | |
31 | struct fib6_node *right; | |
32 | ||
33 | struct fib6_node *subtree; | |
34 | ||
35 | struct rt6_info *leaf; | |
36 | ||
37 | __u16 fn_bit; /* bit key */ | |
38 | __u16 fn_flags; | |
39 | __u32 fn_sernum; | |
40 | }; | |
41 | ||
42 | ||
43 | /* | |
44 | * routing information | |
45 | * | |
46 | */ | |
47 | ||
48 | struct rt6key | |
49 | { | |
50 | struct in6_addr addr; | |
51 | int plen; | |
52 | }; | |
53 | ||
c71099ac TG |
54 | struct fib6_table; |
55 | ||
1da177e4 LT |
56 | struct rt6_info |
57 | { | |
58 | union { | |
59 | struct dst_entry dst; | |
60 | struct rt6_info *next; | |
61 | } u; | |
62 | ||
63 | struct inet6_dev *rt6i_idev; | |
64 | ||
65 | #define rt6i_dev u.dst.dev | |
66 | #define rt6i_nexthop u.dst.neighbour | |
67 | #define rt6i_expires u.dst.expires | |
68 | ||
69 | struct fib6_node *rt6i_node; | |
70 | ||
71 | struct in6_addr rt6i_gateway; | |
72 | ||
73 | u32 rt6i_flags; | |
74 | u32 rt6i_metric; | |
75 | atomic_t rt6i_ref; | |
c71099ac | 76 | struct fib6_table *rt6i_table; |
1da177e4 LT |
77 | |
78 | struct rt6key rt6i_dst; | |
79 | struct rt6key rt6i_src; | |
80 | ||
81 | u8 rt6i_protocol; | |
82 | }; | |
83 | ||
84 | struct fib6_walker_t | |
85 | { | |
86 | struct fib6_walker_t *prev, *next; | |
87 | struct fib6_node *root, *node; | |
88 | struct rt6_info *leaf; | |
89 | unsigned char state; | |
90 | unsigned char prune; | |
91 | int (*func)(struct fib6_walker_t *); | |
92 | void *args; | |
93 | }; | |
94 | ||
95 | extern struct fib6_walker_t fib6_walker_list; | |
96 | extern rwlock_t fib6_walker_lock; | |
97 | ||
98 | static inline void fib6_walker_link(struct fib6_walker_t *w) | |
99 | { | |
100 | write_lock_bh(&fib6_walker_lock); | |
101 | w->next = fib6_walker_list.next; | |
102 | w->prev = &fib6_walker_list; | |
103 | w->next->prev = w; | |
104 | w->prev->next = w; | |
105 | write_unlock_bh(&fib6_walker_lock); | |
106 | } | |
107 | ||
108 | static inline void fib6_walker_unlink(struct fib6_walker_t *w) | |
109 | { | |
110 | write_lock_bh(&fib6_walker_lock); | |
111 | w->next->prev = w->prev; | |
112 | w->prev->next = w->next; | |
113 | w->prev = w->next = w; | |
114 | write_unlock_bh(&fib6_walker_lock); | |
115 | } | |
116 | ||
117 | struct rt6_statistics { | |
118 | __u32 fib_nodes; | |
119 | __u32 fib_route_nodes; | |
120 | __u32 fib_rt_alloc; /* permanent routes */ | |
121 | __u32 fib_rt_entries; /* rt entries in table */ | |
122 | __u32 fib_rt_cache; /* cache routes */ | |
123 | __u32 fib_discarded_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 | ||
c71099ac TG |
149 | struct fib6_table { |
150 | struct hlist_node tb6_hlist; | |
151 | u32 tb6_id; | |
152 | rwlock_t tb6_lock; | |
153 | struct fib6_node tb6_root; | |
154 | }; | |
155 | ||
156 | #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC | |
157 | #define RT6_TABLE_MAIN RT_TABLE_MAIN | |
158 | #define RT6_TABLE_LOCAL RT6_TABLE_MAIN | |
159 | #define RT6_TABLE_DFLT RT6_TABLE_MAIN | |
160 | #define RT6_TABLE_INFO RT6_TABLE_MAIN | |
161 | #define RT6_TABLE_PREFIX RT6_TABLE_MAIN | |
162 | ||
163 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
164 | #define FIB6_TABLE_MIN 1 | |
165 | #define FIB6_TABLE_MAX RT_TABLE_MAX | |
166 | #else | |
167 | #define FIB6_TABLE_MIN RT_TABLE_MAIN | |
168 | #define FIB6_TABLE_MAX FIB6_TABLE_MIN | |
169 | #endif | |
170 | ||
171 | #define RT6_F_STRICT 1 | |
172 | #define RT6_F_HAS_SADDR 2 | |
173 | ||
174 | typedef struct rt6_info *(*pol_lookup_t)(struct fib6_table *, | |
175 | struct flowi *, int); | |
1da177e4 LT |
176 | |
177 | /* | |
178 | * exported functions | |
179 | */ | |
180 | ||
c71099ac TG |
181 | extern struct fib6_table * fib6_get_table(u32 id); |
182 | extern struct fib6_table * fib6_new_table(u32 id); | |
183 | extern struct dst_entry * fib6_rule_lookup(struct flowi *fl, int flags, | |
184 | pol_lookup_t lookup); | |
185 | ||
1da177e4 LT |
186 | extern struct fib6_node *fib6_lookup(struct fib6_node *root, |
187 | struct in6_addr *daddr, | |
188 | struct in6_addr *saddr); | |
189 | ||
190 | struct fib6_node *fib6_locate(struct fib6_node *root, | |
191 | struct in6_addr *daddr, int dst_len, | |
192 | struct in6_addr *saddr, int src_len); | |
193 | ||
194 | extern void fib6_clean_tree(struct fib6_node *root, | |
195 | int (*func)(struct rt6_info *, void *arg), | |
196 | int prune, void *arg); | |
197 | ||
c71099ac TG |
198 | extern void fib6_clean_all(int (*func)(struct rt6_info *, void *arg), |
199 | int prune, void *arg); | |
200 | ||
1da177e4 LT |
201 | extern int fib6_walk(struct fib6_walker_t *w); |
202 | extern int fib6_walk_continue(struct fib6_walker_t *w); | |
203 | ||
204 | extern int fib6_add(struct fib6_node *root, | |
205 | struct rt6_info *rt, | |
206 | struct nlmsghdr *nlh, | |
0d51aa80 JHS |
207 | void *rtattr, |
208 | struct netlink_skb_parms *req); | |
1da177e4 LT |
209 | |
210 | extern int fib6_del(struct rt6_info *rt, | |
211 | struct nlmsghdr *nlh, | |
0d51aa80 JHS |
212 | void *rtattr, |
213 | struct netlink_skb_parms *req); | |
1da177e4 LT |
214 | |
215 | extern void inet6_rt_notify(int event, struct rt6_info *rt, | |
0d51aa80 JHS |
216 | struct nlmsghdr *nlh, |
217 | struct netlink_skb_parms *req); | |
1da177e4 LT |
218 | |
219 | extern void fib6_run_gc(unsigned long dummy); | |
220 | ||
221 | extern void fib6_gc_cleanup(void); | |
222 | ||
223 | extern void fib6_init(void); | |
224 | #endif | |
225 | #endif |