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Commit | Line | Data |
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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 | ||
1da177e4 | 16 | #include <linux/ipv6_route.h> |
1da177e4 LT |
17 | #include <linux/rtnetlink.h> |
18 | #include <linux/spinlock.h> | |
86872cb5 TG |
19 | #include <net/dst.h> |
20 | #include <net/flow.h> | |
21 | #include <net/netlink.h> | |
b3419363 | 22 | #include <net/inetpeer.h> |
1da177e4 | 23 | |
a33bc5c1 NH |
24 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
25 | #define FIB6_TABLE_HASHSZ 256 | |
26 | #else | |
27 | #define FIB6_TABLE_HASHSZ 1 | |
28 | #endif | |
29 | ||
1da177e4 LT |
30 | struct rt6_info; |
31 | ||
fd2c3ef7 | 32 | struct fib6_config { |
86872cb5 TG |
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; | |
ef2c7d7b | 40 | u32 fc_type; /* only 8 bits are used */ |
86872cb5 TG |
41 | |
42 | struct in6_addr fc_dst; | |
43 | struct in6_addr fc_src; | |
c3968a85 | 44 | struct in6_addr fc_prefsrc; |
86872cb5 TG |
45 | struct in6_addr fc_gateway; |
46 | ||
47 | unsigned long fc_expires; | |
48 | struct nlattr *fc_mx; | |
49 | int fc_mx_len; | |
51ebd318 ND |
50 | int fc_mp_len; |
51 | struct nlattr *fc_mp; | |
86872cb5 TG |
52 | |
53 | struct nl_info fc_nlinfo; | |
54 | }; | |
55 | ||
fd2c3ef7 | 56 | struct fib6_node { |
1da177e4 LT |
57 | struct fib6_node *parent; |
58 | struct fib6_node *left; | |
59 | struct fib6_node *right; | |
8bce65b9 | 60 | #ifdef CONFIG_IPV6_SUBTREES |
1da177e4 | 61 | struct fib6_node *subtree; |
8bce65b9 | 62 | #endif |
1da177e4 LT |
63 | struct rt6_info *leaf; |
64 | ||
65 | __u16 fn_bit; /* bit key */ | |
66 | __u16 fn_flags; | |
67 | __u32 fn_sernum; | |
f11e6659 | 68 | struct rt6_info *rr_ptr; |
1da177e4 LT |
69 | }; |
70 | ||
7fc33165 YH |
71 | #ifndef CONFIG_IPV6_SUBTREES |
72 | #define FIB6_SUBTREE(fn) NULL | |
73 | #else | |
74 | #define FIB6_SUBTREE(fn) ((fn)->subtree) | |
75 | #endif | |
1da177e4 LT |
76 | |
77 | /* | |
78 | * routing information | |
79 | * | |
80 | */ | |
81 | ||
fd2c3ef7 | 82 | struct rt6key { |
1da177e4 LT |
83 | struct in6_addr addr; |
84 | int plen; | |
85 | }; | |
86 | ||
c71099ac TG |
87 | struct fib6_table; |
88 | ||
fd2c3ef7 | 89 | struct rt6_info { |
d8d1f30b | 90 | struct dst_entry dst; |
1da177e4 | 91 | |
97cac082 DM |
92 | struct neighbour *n; |
93 | ||
bd2c77a0 YH |
94 | /* |
95 | * Tail elements of dst_entry (__refcnt etc.) | |
96 | * and these elements (rarely used in hot path) are in | |
97 | * the same cache line. | |
98 | */ | |
99 | struct fib6_table *rt6i_table; | |
1da177e4 LT |
100 | struct fib6_node *rt6i_node; |
101 | ||
102 | struct in6_addr rt6i_gateway; | |
1da177e4 | 103 | |
51ebd318 ND |
104 | /* Multipath routes: |
105 | * siblings is a list of rt6_info that have the the same metric/weight, | |
106 | * destination, but not the same gateway. nsiblings is just a cache | |
107 | * to speed up lookup. | |
108 | */ | |
109 | struct list_head rt6i_siblings; | |
110 | unsigned int rt6i_nsiblings; | |
111 | ||
bd2c77a0 | 112 | atomic_t rt6i_ref; |
a47ed4cd | 113 | |
bd2c77a0 YH |
114 | /* These are in a separate cache line. */ |
115 | struct rt6key rt6i_dst ____cacheline_aligned_in_smp; | |
116 | u32 rt6i_flags; | |
117 | struct rt6key rt6i_src; | |
c3968a85 | 118 | struct rt6key rt6i_prefsrc; |
bd2c77a0 | 119 | u32 rt6i_metric; |
b4ce9277 | 120 | |
bd2c77a0 | 121 | struct inet6_dev *rt6i_idev; |
97bab73f | 122 | unsigned long _rt6i_peer; |
b4ce9277 | 123 | |
6f3118b5 ND |
124 | u32 rt6i_genid; |
125 | ||
bd2c77a0 YH |
126 | /* more non-fragment space at head required */ |
127 | unsigned short rt6i_nfheader_len; | |
b4ce9277 | 128 | |
bd2c77a0 | 129 | u8 rt6i_protocol; |
1da177e4 LT |
130 | }; |
131 | ||
97bab73f DM |
132 | static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt) |
133 | { | |
134 | return inetpeer_ptr(rt->_rt6i_peer); | |
135 | } | |
136 | ||
137 | static inline bool rt6_has_peer(struct rt6_info *rt) | |
138 | { | |
139 | return inetpeer_ptr_is_peer(rt->_rt6i_peer); | |
140 | } | |
141 | ||
142 | static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer) | |
143 | { | |
144 | __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer); | |
145 | } | |
146 | ||
147 | static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer) | |
148 | { | |
149 | return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer); | |
150 | } | |
151 | ||
152 | static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base) | |
153 | { | |
154 | inetpeer_init_ptr(&rt->_rt6i_peer, base); | |
155 | } | |
156 | ||
157 | static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort) | |
158 | { | |
159 | inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer); | |
160 | } | |
161 | ||
7a3025b1 YH |
162 | static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) |
163 | { | |
164 | return ((struct rt6_info *)dst)->rt6i_idev; | |
165 | } | |
166 | ||
1716a961 G |
167 | static inline void rt6_clean_expires(struct rt6_info *rt) |
168 | { | |
169 | if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) | |
170 | dst_release(rt->dst.from); | |
171 | ||
172 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
cda31e10 | 173 | rt->dst.from = NULL; |
1716a961 G |
174 | } |
175 | ||
176 | static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires) | |
177 | { | |
178 | if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) | |
179 | dst_release(rt->dst.from); | |
180 | ||
181 | rt->rt6i_flags |= RTF_EXPIRES; | |
182 | rt->dst.expires = expires; | |
183 | } | |
184 | ||
185 | static inline void rt6_update_expires(struct rt6_info *rt, int timeout) | |
186 | { | |
edfb5d46 JB |
187 | if (!(rt->rt6i_flags & RTF_EXPIRES)) { |
188 | if (rt->dst.from) | |
189 | dst_release(rt->dst.from); | |
190 | /* dst_set_expires relies on expires == 0 | |
191 | * if it has not been set previously. | |
192 | */ | |
193 | rt->dst.expires = 0; | |
194 | } | |
1716a961 G |
195 | |
196 | dst_set_expires(&rt->dst, timeout); | |
197 | rt->rt6i_flags |= RTF_EXPIRES; | |
198 | } | |
199 | ||
200 | static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) | |
201 | { | |
202 | struct dst_entry *new = (struct dst_entry *) from; | |
203 | ||
204 | if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from) { | |
205 | if (new == rt->dst.from) | |
206 | return; | |
207 | dst_release(rt->dst.from); | |
208 | } | |
209 | ||
210 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
211 | rt->dst.from = new; | |
212 | dst_hold(new); | |
213 | } | |
214 | ||
94e187c0 AW |
215 | static inline void ip6_rt_put(struct rt6_info *rt) |
216 | { | |
217 | /* dst_release() accepts a NULL parameter. | |
218 | * We rely on dst being first structure in struct rt6_info | |
219 | */ | |
220 | BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0); | |
221 | dst_release(&rt->dst); | |
222 | } | |
223 | ||
fd2c3ef7 | 224 | struct fib6_walker_t { |
bbef49da | 225 | struct list_head lh; |
1da177e4 LT |
226 | struct fib6_node *root, *node; |
227 | struct rt6_info *leaf; | |
228 | unsigned char state; | |
229 | unsigned char prune; | |
2bec5a36 PM |
230 | unsigned int skip; |
231 | unsigned int count; | |
1da177e4 LT |
232 | int (*func)(struct fib6_walker_t *); |
233 | void *args; | |
234 | }; | |
235 | ||
1da177e4 LT |
236 | struct rt6_statistics { |
237 | __u32 fib_nodes; | |
238 | __u32 fib_route_nodes; | |
239 | __u32 fib_rt_alloc; /* permanent routes */ | |
240 | __u32 fib_rt_entries; /* rt entries in table */ | |
241 | __u32 fib_rt_cache; /* cache routes */ | |
242 | __u32 fib_discarded_routes; | |
243 | }; | |
244 | ||
245 | #define RTN_TL_ROOT 0x0001 | |
246 | #define RTN_ROOT 0x0002 /* tree root node */ | |
247 | #define RTN_RTINFO 0x0004 /* node with valid routing info */ | |
248 | ||
249 | /* | |
250 | * priority levels (or metrics) | |
251 | * | |
252 | */ | |
253 | ||
1da177e4 | 254 | |
c71099ac TG |
255 | struct fib6_table { |
256 | struct hlist_node tb6_hlist; | |
257 | u32 tb6_id; | |
258 | rwlock_t tb6_lock; | |
259 | struct fib6_node tb6_root; | |
8e773277 | 260 | struct inet_peer_base tb6_peers; |
c71099ac TG |
261 | }; |
262 | ||
263 | #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC | |
264 | #define RT6_TABLE_MAIN RT_TABLE_MAIN | |
c71099ac TG |
265 | #define RT6_TABLE_DFLT RT6_TABLE_MAIN |
266 | #define RT6_TABLE_INFO RT6_TABLE_MAIN | |
267 | #define RT6_TABLE_PREFIX RT6_TABLE_MAIN | |
268 | ||
269 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
270 | #define FIB6_TABLE_MIN 1 | |
271 | #define FIB6_TABLE_MAX RT_TABLE_MAX | |
101367c2 | 272 | #define RT6_TABLE_LOCAL RT_TABLE_LOCAL |
c71099ac TG |
273 | #else |
274 | #define FIB6_TABLE_MIN RT_TABLE_MAIN | |
275 | #define FIB6_TABLE_MAX FIB6_TABLE_MIN | |
101367c2 | 276 | #define RT6_TABLE_LOCAL RT6_TABLE_MAIN |
c71099ac TG |
277 | #endif |
278 | ||
8ed67789 DL |
279 | typedef struct rt6_info *(*pol_lookup_t)(struct net *, |
280 | struct fib6_table *, | |
4c9483b2 | 281 | struct flowi6 *, int); |
1da177e4 LT |
282 | |
283 | /* | |
284 | * exported functions | |
285 | */ | |
286 | ||
58f09b78 DL |
287 | extern struct fib6_table *fib6_get_table(struct net *net, u32 id); |
288 | extern struct fib6_table *fib6_new_table(struct net *net, u32 id); | |
289 | extern struct dst_entry *fib6_rule_lookup(struct net *net, | |
4c9483b2 | 290 | struct flowi6 *fl6, int flags, |
58f09b78 | 291 | pol_lookup_t lookup); |
c71099ac | 292 | |
1da177e4 | 293 | extern struct fib6_node *fib6_lookup(struct fib6_node *root, |
b71d1d42 ED |
294 | const struct in6_addr *daddr, |
295 | const struct in6_addr *saddr); | |
1da177e4 LT |
296 | |
297 | struct fib6_node *fib6_locate(struct fib6_node *root, | |
b71d1d42 ED |
298 | const struct in6_addr *daddr, int dst_len, |
299 | const struct in6_addr *saddr, int src_len); | |
1da177e4 | 300 | |
32b293a5 JH |
301 | extern void fib6_clean_all_ro(struct net *net, |
302 | int (*func)(struct rt6_info *, void *arg), | |
303 | int prune, void *arg); | |
304 | ||
f3db4851 DL |
305 | extern void fib6_clean_all(struct net *net, |
306 | int (*func)(struct rt6_info *, void *arg), | |
c71099ac TG |
307 | int prune, void *arg); |
308 | ||
1da177e4 LT |
309 | extern int fib6_add(struct fib6_node *root, |
310 | struct rt6_info *rt, | |
86872cb5 | 311 | struct nl_info *info); |
1da177e4 LT |
312 | |
313 | extern int fib6_del(struct rt6_info *rt, | |
86872cb5 | 314 | struct nl_info *info); |
1da177e4 LT |
315 | |
316 | extern void inet6_rt_notify(int event, struct rt6_info *rt, | |
86872cb5 | 317 | struct nl_info *info); |
1da177e4 | 318 | |
5b7c931d DL |
319 | extern void fib6_run_gc(unsigned long expires, |
320 | struct net *net); | |
1da177e4 LT |
321 | |
322 | extern void fib6_gc_cleanup(void); | |
323 | ||
d63bddbe | 324 | extern int fib6_init(void); |
101367c2 | 325 | |
7e5449c2 | 326 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
9eb87f3f | 327 | extern int fib6_rules_init(void); |
101367c2 | 328 | extern void fib6_rules_cleanup(void); |
7e5449c2 DL |
329 | #else |
330 | static inline int fib6_rules_init(void) | |
331 | { | |
332 | return 0; | |
333 | } | |
334 | static inline void fib6_rules_cleanup(void) | |
335 | { | |
336 | return ; | |
337 | } | |
338 | #endif | |
1da177e4 | 339 | #endif |