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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; | |
42b18706 | 67 | int 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 | 76 | |
e715b6d3 FW |
77 | struct mx6_config { |
78 | const u32 *mx; | |
79 | DECLARE_BITMAP(mx_valid, RTAX_MAX); | |
80 | }; | |
81 | ||
1da177e4 LT |
82 | /* |
83 | * routing information | |
84 | * | |
85 | */ | |
86 | ||
fd2c3ef7 | 87 | struct rt6key { |
1da177e4 LT |
88 | struct in6_addr addr; |
89 | int plen; | |
90 | }; | |
91 | ||
c71099ac TG |
92 | struct fib6_table; |
93 | ||
fd2c3ef7 | 94 | struct rt6_info { |
d8d1f30b | 95 | struct dst_entry dst; |
1da177e4 | 96 | |
bd2c77a0 YH |
97 | /* |
98 | * Tail elements of dst_entry (__refcnt etc.) | |
99 | * and these elements (rarely used in hot path) are in | |
100 | * the same cache line. | |
101 | */ | |
102 | struct fib6_table *rt6i_table; | |
1da177e4 LT |
103 | struct fib6_node *rt6i_node; |
104 | ||
105 | struct in6_addr rt6i_gateway; | |
1da177e4 | 106 | |
51ebd318 ND |
107 | /* Multipath routes: |
108 | * siblings is a list of rt6_info that have the the same metric/weight, | |
109 | * destination, but not the same gateway. nsiblings is just a cache | |
110 | * to speed up lookup. | |
111 | */ | |
112 | struct list_head rt6i_siblings; | |
113 | unsigned int rt6i_nsiblings; | |
114 | ||
bd2c77a0 | 115 | atomic_t rt6i_ref; |
a47ed4cd | 116 | |
bd2c77a0 YH |
117 | /* These are in a separate cache line. */ |
118 | struct rt6key rt6i_dst ____cacheline_aligned_in_smp; | |
119 | u32 rt6i_flags; | |
120 | struct rt6key rt6i_src; | |
c3968a85 | 121 | struct rt6key rt6i_prefsrc; |
b4ce9277 | 122 | |
bd2c77a0 | 123 | struct inet6_dev *rt6i_idev; |
b4ce9277 | 124 | |
705f1c86 | 125 | u32 rt6i_metric; |
4b32b5ad | 126 | u32 rt6i_pmtu; |
bd2c77a0 YH |
127 | /* more non-fragment space at head required */ |
128 | unsigned short rt6i_nfheader_len; | |
bd2c77a0 | 129 | u8 rt6i_protocol; |
1da177e4 LT |
130 | }; |
131 | ||
7a3025b1 YH |
132 | static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) |
133 | { | |
134 | return ((struct rt6_info *)dst)->rt6i_idev; | |
135 | } | |
136 | ||
1716a961 G |
137 | static inline void rt6_clean_expires(struct rt6_info *rt) |
138 | { | |
1716a961 | 139 | rt->rt6i_flags &= ~RTF_EXPIRES; |
01ba16d6 | 140 | rt->dst.expires = 0; |
1716a961 G |
141 | } |
142 | ||
143 | static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires) | |
144 | { | |
1716a961 | 145 | rt->dst.expires = expires; |
ecd98837 | 146 | rt->rt6i_flags |= RTF_EXPIRES; |
1716a961 G |
147 | } |
148 | ||
ecd98837 | 149 | static inline void rt6_update_expires(struct rt6_info *rt0, int timeout) |
1716a961 | 150 | { |
ecd98837 YH |
151 | struct rt6_info *rt; |
152 | ||
153 | for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES); | |
154 | rt = (struct rt6_info *)rt->dst.from); | |
155 | if (rt && rt != rt0) | |
156 | rt0->dst.expires = rt->dst.expires; | |
157 | ||
158 | dst_set_expires(&rt0->dst, timeout); | |
159 | rt0->rt6i_flags |= RTF_EXPIRES; | |
1716a961 | 160 | } |
b197df4f MKL |
161 | |
162 | static inline u32 rt6_get_cookie(const struct rt6_info *rt) | |
163 | { | |
164 | return rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; | |
165 | } | |
1716a961 | 166 | |
94e187c0 AW |
167 | static inline void ip6_rt_put(struct rt6_info *rt) |
168 | { | |
169 | /* dst_release() accepts a NULL parameter. | |
170 | * We rely on dst being first structure in struct rt6_info | |
171 | */ | |
172 | BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0); | |
173 | dst_release(&rt->dst); | |
174 | } | |
175 | ||
94b2cfe0 HFS |
176 | enum fib6_walk_state { |
177 | #ifdef CONFIG_IPV6_SUBTREES | |
178 | FWS_S, | |
179 | #endif | |
180 | FWS_L, | |
181 | FWS_R, | |
182 | FWS_C, | |
183 | FWS_U | |
184 | }; | |
185 | ||
186 | struct fib6_walker { | |
bbef49da | 187 | struct list_head lh; |
1da177e4 LT |
188 | struct fib6_node *root, *node; |
189 | struct rt6_info *leaf; | |
94b2cfe0 HFS |
190 | enum fib6_walk_state state; |
191 | bool prune; | |
2bec5a36 PM |
192 | unsigned int skip; |
193 | unsigned int count; | |
94b2cfe0 | 194 | int (*func)(struct fib6_walker *); |
1da177e4 LT |
195 | void *args; |
196 | }; | |
197 | ||
1da177e4 LT |
198 | struct rt6_statistics { |
199 | __u32 fib_nodes; | |
200 | __u32 fib_route_nodes; | |
201 | __u32 fib_rt_alloc; /* permanent routes */ | |
202 | __u32 fib_rt_entries; /* rt entries in table */ | |
203 | __u32 fib_rt_cache; /* cache routes */ | |
204 | __u32 fib_discarded_routes; | |
205 | }; | |
206 | ||
207 | #define RTN_TL_ROOT 0x0001 | |
208 | #define RTN_ROOT 0x0002 /* tree root node */ | |
209 | #define RTN_RTINFO 0x0004 /* node with valid routing info */ | |
210 | ||
211 | /* | |
212 | * priority levels (or metrics) | |
213 | * | |
214 | */ | |
215 | ||
1da177e4 | 216 | |
c71099ac TG |
217 | struct fib6_table { |
218 | struct hlist_node tb6_hlist; | |
219 | u32 tb6_id; | |
220 | rwlock_t tb6_lock; | |
221 | struct fib6_node tb6_root; | |
8e773277 | 222 | struct inet_peer_base tb6_peers; |
c71099ac TG |
223 | }; |
224 | ||
225 | #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC | |
226 | #define RT6_TABLE_MAIN RT_TABLE_MAIN | |
c71099ac TG |
227 | #define RT6_TABLE_DFLT RT6_TABLE_MAIN |
228 | #define RT6_TABLE_INFO RT6_TABLE_MAIN | |
229 | #define RT6_TABLE_PREFIX RT6_TABLE_MAIN | |
230 | ||
231 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
232 | #define FIB6_TABLE_MIN 1 | |
233 | #define FIB6_TABLE_MAX RT_TABLE_MAX | |
101367c2 | 234 | #define RT6_TABLE_LOCAL RT_TABLE_LOCAL |
c71099ac TG |
235 | #else |
236 | #define FIB6_TABLE_MIN RT_TABLE_MAIN | |
237 | #define FIB6_TABLE_MAX FIB6_TABLE_MIN | |
101367c2 | 238 | #define RT6_TABLE_LOCAL RT6_TABLE_MAIN |
c71099ac TG |
239 | #endif |
240 | ||
8ed67789 DL |
241 | typedef struct rt6_info *(*pol_lookup_t)(struct net *, |
242 | struct fib6_table *, | |
4c9483b2 | 243 | struct flowi6 *, int); |
1da177e4 LT |
244 | |
245 | /* | |
246 | * exported functions | |
247 | */ | |
248 | ||
5c3a0fd7 JP |
249 | struct fib6_table *fib6_get_table(struct net *net, u32 id); |
250 | struct fib6_table *fib6_new_table(struct net *net, u32 id); | |
251 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, | |
252 | int flags, pol_lookup_t lookup); | |
c71099ac | 253 | |
5c3a0fd7 JP |
254 | struct fib6_node *fib6_lookup(struct fib6_node *root, |
255 | const struct in6_addr *daddr, | |
256 | const struct in6_addr *saddr); | |
1da177e4 | 257 | |
5c3a0fd7 JP |
258 | struct fib6_node *fib6_locate(struct fib6_node *root, |
259 | const struct in6_addr *daddr, int dst_len, | |
260 | const struct in6_addr *saddr, int src_len); | |
1da177e4 | 261 | |
5c3a0fd7 | 262 | void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg), |
0c3584d5 | 263 | void *arg); |
c71099ac | 264 | |
e715b6d3 FW |
265 | int fib6_add(struct fib6_node *root, struct rt6_info *rt, |
266 | struct nl_info *info, struct mx6_config *mxc); | |
5c3a0fd7 | 267 | int fib6_del(struct rt6_info *rt, struct nl_info *info); |
1da177e4 | 268 | |
5c3a0fd7 | 269 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info); |
1da177e4 | 270 | |
5c3a0fd7 | 271 | void fib6_run_gc(unsigned long expires, struct net *net, bool force); |
1da177e4 | 272 | |
5c3a0fd7 | 273 | void fib6_gc_cleanup(void); |
1da177e4 | 274 | |
5c3a0fd7 | 275 | int fib6_init(void); |
101367c2 | 276 | |
8d2ca1d7 HFS |
277 | int ipv6_route_open(struct inode *inode, struct file *file); |
278 | ||
7e5449c2 | 279 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
5c3a0fd7 JP |
280 | int fib6_rules_init(void); |
281 | void fib6_rules_cleanup(void); | |
7e5449c2 DL |
282 | #else |
283 | static inline int fib6_rules_init(void) | |
284 | { | |
285 | return 0; | |
286 | } | |
287 | static inline void fib6_rules_cleanup(void) | |
288 | { | |
289 | return ; | |
290 | } | |
291 | #endif | |
1da177e4 | 292 | #endif |