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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 | |
bd2c77a0 YH |
92 | /* |
93 | * Tail elements of dst_entry (__refcnt etc.) | |
94 | * and these elements (rarely used in hot path) are in | |
95 | * the same cache line. | |
96 | */ | |
97 | struct fib6_table *rt6i_table; | |
1da177e4 LT |
98 | struct fib6_node *rt6i_node; |
99 | ||
100 | struct in6_addr rt6i_gateway; | |
1da177e4 | 101 | |
51ebd318 ND |
102 | /* Multipath routes: |
103 | * siblings is a list of rt6_info that have the the same metric/weight, | |
104 | * destination, but not the same gateway. nsiblings is just a cache | |
105 | * to speed up lookup. | |
106 | */ | |
107 | struct list_head rt6i_siblings; | |
108 | unsigned int rt6i_nsiblings; | |
109 | ||
bd2c77a0 | 110 | atomic_t rt6i_ref; |
a47ed4cd | 111 | |
bd2c77a0 YH |
112 | /* These are in a separate cache line. */ |
113 | struct rt6key rt6i_dst ____cacheline_aligned_in_smp; | |
114 | u32 rt6i_flags; | |
115 | struct rt6key rt6i_src; | |
c3968a85 | 116 | struct rt6key rt6i_prefsrc; |
b4ce9277 | 117 | |
bd2c77a0 | 118 | struct inet6_dev *rt6i_idev; |
97bab73f | 119 | unsigned long _rt6i_peer; |
b4ce9277 | 120 | |
705f1c86 | 121 | u32 rt6i_metric; |
bd2c77a0 YH |
122 | /* more non-fragment space at head required */ |
123 | unsigned short rt6i_nfheader_len; | |
bd2c77a0 | 124 | u8 rt6i_protocol; |
1da177e4 LT |
125 | }; |
126 | ||
97bab73f DM |
127 | static inline struct inet_peer *rt6_peer_ptr(struct rt6_info *rt) |
128 | { | |
129 | return inetpeer_ptr(rt->_rt6i_peer); | |
130 | } | |
131 | ||
132 | static inline bool rt6_has_peer(struct rt6_info *rt) | |
133 | { | |
134 | return inetpeer_ptr_is_peer(rt->_rt6i_peer); | |
135 | } | |
136 | ||
137 | static inline void __rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer) | |
138 | { | |
139 | __inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer); | |
140 | } | |
141 | ||
142 | static inline bool rt6_set_peer(struct rt6_info *rt, struct inet_peer *peer) | |
143 | { | |
144 | return inetpeer_ptr_set_peer(&rt->_rt6i_peer, peer); | |
145 | } | |
146 | ||
147 | static inline void rt6_init_peer(struct rt6_info *rt, struct inet_peer_base *base) | |
148 | { | |
149 | inetpeer_init_ptr(&rt->_rt6i_peer, base); | |
150 | } | |
151 | ||
152 | static inline void rt6_transfer_peer(struct rt6_info *rt, struct rt6_info *ort) | |
153 | { | |
154 | inetpeer_transfer_peer(&rt->_rt6i_peer, &ort->_rt6i_peer); | |
155 | } | |
156 | ||
7a3025b1 YH |
157 | static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) |
158 | { | |
159 | return ((struct rt6_info *)dst)->rt6i_idev; | |
160 | } | |
161 | ||
1716a961 G |
162 | static inline void rt6_clean_expires(struct rt6_info *rt) |
163 | { | |
1716a961 | 164 | rt->rt6i_flags &= ~RTF_EXPIRES; |
01ba16d6 | 165 | rt->dst.expires = 0; |
1716a961 G |
166 | } |
167 | ||
168 | static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires) | |
169 | { | |
1716a961 | 170 | rt->dst.expires = expires; |
ecd98837 | 171 | rt->rt6i_flags |= RTF_EXPIRES; |
1716a961 G |
172 | } |
173 | ||
ecd98837 | 174 | static inline void rt6_update_expires(struct rt6_info *rt0, int timeout) |
1716a961 | 175 | { |
ecd98837 YH |
176 | struct rt6_info *rt; |
177 | ||
178 | for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES); | |
179 | rt = (struct rt6_info *)rt->dst.from); | |
180 | if (rt && rt != rt0) | |
181 | rt0->dst.expires = rt->dst.expires; | |
182 | ||
183 | dst_set_expires(&rt0->dst, timeout); | |
184 | rt0->rt6i_flags |= RTF_EXPIRES; | |
1716a961 G |
185 | } |
186 | ||
187 | static inline void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) | |
188 | { | |
189 | struct dst_entry *new = (struct dst_entry *) from; | |
190 | ||
1716a961 | 191 | rt->rt6i_flags &= ~RTF_EXPIRES; |
1716a961 | 192 | dst_hold(new); |
ecd98837 | 193 | rt->dst.from = new; |
1716a961 G |
194 | } |
195 | ||
94e187c0 AW |
196 | static inline void ip6_rt_put(struct rt6_info *rt) |
197 | { | |
198 | /* dst_release() accepts a NULL parameter. | |
199 | * We rely on dst being first structure in struct rt6_info | |
200 | */ | |
201 | BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0); | |
202 | dst_release(&rt->dst); | |
203 | } | |
204 | ||
fd2c3ef7 | 205 | struct fib6_walker_t { |
bbef49da | 206 | struct list_head lh; |
1da177e4 LT |
207 | struct fib6_node *root, *node; |
208 | struct rt6_info *leaf; | |
209 | unsigned char state; | |
210 | unsigned char prune; | |
2bec5a36 PM |
211 | unsigned int skip; |
212 | unsigned int count; | |
1da177e4 LT |
213 | int (*func)(struct fib6_walker_t *); |
214 | void *args; | |
215 | }; | |
216 | ||
1da177e4 LT |
217 | struct rt6_statistics { |
218 | __u32 fib_nodes; | |
219 | __u32 fib_route_nodes; | |
220 | __u32 fib_rt_alloc; /* permanent routes */ | |
221 | __u32 fib_rt_entries; /* rt entries in table */ | |
222 | __u32 fib_rt_cache; /* cache routes */ | |
223 | __u32 fib_discarded_routes; | |
224 | }; | |
225 | ||
226 | #define RTN_TL_ROOT 0x0001 | |
227 | #define RTN_ROOT 0x0002 /* tree root node */ | |
228 | #define RTN_RTINFO 0x0004 /* node with valid routing info */ | |
229 | ||
230 | /* | |
231 | * priority levels (or metrics) | |
232 | * | |
233 | */ | |
234 | ||
1da177e4 | 235 | |
c71099ac TG |
236 | struct fib6_table { |
237 | struct hlist_node tb6_hlist; | |
238 | u32 tb6_id; | |
239 | rwlock_t tb6_lock; | |
240 | struct fib6_node tb6_root; | |
8e773277 | 241 | struct inet_peer_base tb6_peers; |
c71099ac TG |
242 | }; |
243 | ||
244 | #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC | |
245 | #define RT6_TABLE_MAIN RT_TABLE_MAIN | |
c71099ac TG |
246 | #define RT6_TABLE_DFLT RT6_TABLE_MAIN |
247 | #define RT6_TABLE_INFO RT6_TABLE_MAIN | |
248 | #define RT6_TABLE_PREFIX RT6_TABLE_MAIN | |
249 | ||
250 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
251 | #define FIB6_TABLE_MIN 1 | |
252 | #define FIB6_TABLE_MAX RT_TABLE_MAX | |
101367c2 | 253 | #define RT6_TABLE_LOCAL RT_TABLE_LOCAL |
c71099ac TG |
254 | #else |
255 | #define FIB6_TABLE_MIN RT_TABLE_MAIN | |
256 | #define FIB6_TABLE_MAX FIB6_TABLE_MIN | |
101367c2 | 257 | #define RT6_TABLE_LOCAL RT6_TABLE_MAIN |
c71099ac TG |
258 | #endif |
259 | ||
8ed67789 DL |
260 | typedef struct rt6_info *(*pol_lookup_t)(struct net *, |
261 | struct fib6_table *, | |
4c9483b2 | 262 | struct flowi6 *, int); |
1da177e4 LT |
263 | |
264 | /* | |
265 | * exported functions | |
266 | */ | |
267 | ||
5c3a0fd7 JP |
268 | struct fib6_table *fib6_get_table(struct net *net, u32 id); |
269 | struct fib6_table *fib6_new_table(struct net *net, u32 id); | |
270 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, | |
271 | int flags, pol_lookup_t lookup); | |
c71099ac | 272 | |
5c3a0fd7 JP |
273 | struct fib6_node *fib6_lookup(struct fib6_node *root, |
274 | const struct in6_addr *daddr, | |
275 | const struct in6_addr *saddr); | |
1da177e4 | 276 | |
5c3a0fd7 JP |
277 | struct fib6_node *fib6_locate(struct fib6_node *root, |
278 | const struct in6_addr *daddr, int dst_len, | |
279 | const struct in6_addr *saddr, int src_len); | |
1da177e4 | 280 | |
5c3a0fd7 | 281 | void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg), |
0c3584d5 | 282 | void *arg); |
c71099ac | 283 | |
e5fd387a MK |
284 | int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info, |
285 | struct nlattr *mx, int mx_len); | |
1da177e4 | 286 | |
5c3a0fd7 | 287 | int fib6_del(struct rt6_info *rt, struct nl_info *info); |
1da177e4 | 288 | |
5c3a0fd7 | 289 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info); |
1da177e4 | 290 | |
5c3a0fd7 | 291 | void fib6_run_gc(unsigned long expires, struct net *net, bool force); |
1da177e4 | 292 | |
5c3a0fd7 | 293 | void fib6_gc_cleanup(void); |
1da177e4 | 294 | |
5c3a0fd7 | 295 | int fib6_init(void); |
101367c2 | 296 | |
8d2ca1d7 HFS |
297 | int ipv6_route_open(struct inode *inode, struct file *file); |
298 | ||
7e5449c2 | 299 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
5c3a0fd7 JP |
300 | int fib6_rules_init(void); |
301 | void fib6_rules_cleanup(void); | |
7e5449c2 DL |
302 | #else |
303 | static inline int fib6_rules_init(void) | |
304 | { | |
305 | return 0; | |
306 | } | |
307 | static inline void fib6_rules_cleanup(void) | |
308 | { | |
309 | return ; | |
310 | } | |
311 | #endif | |
1da177e4 | 312 | #endif |