Commit | Line | Data |
---|---|---|
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; | |
19e42e45 RP |
54 | struct nlattr *fc_encap; |
55 | u16 fc_encap_type; | |
86872cb5 TG |
56 | }; |
57 | ||
fd2c3ef7 | 58 | struct fib6_node { |
1da177e4 LT |
59 | struct fib6_node *parent; |
60 | struct fib6_node *left; | |
61 | struct fib6_node *right; | |
8bce65b9 | 62 | #ifdef CONFIG_IPV6_SUBTREES |
1da177e4 | 63 | struct fib6_node *subtree; |
8bce65b9 | 64 | #endif |
1da177e4 LT |
65 | struct rt6_info *leaf; |
66 | ||
67 | __u16 fn_bit; /* bit key */ | |
68 | __u16 fn_flags; | |
42b18706 | 69 | int fn_sernum; |
f11e6659 | 70 | struct rt6_info *rr_ptr; |
1da177e4 LT |
71 | }; |
72 | ||
7fc33165 YH |
73 | #ifndef CONFIG_IPV6_SUBTREES |
74 | #define FIB6_SUBTREE(fn) NULL | |
75 | #else | |
76 | #define FIB6_SUBTREE(fn) ((fn)->subtree) | |
77 | #endif | |
1da177e4 | 78 | |
e715b6d3 FW |
79 | struct mx6_config { |
80 | const u32 *mx; | |
81 | DECLARE_BITMAP(mx_valid, RTAX_MAX); | |
82 | }; | |
83 | ||
1da177e4 LT |
84 | /* |
85 | * routing information | |
86 | * | |
87 | */ | |
88 | ||
fd2c3ef7 | 89 | struct rt6key { |
1da177e4 LT |
90 | struct in6_addr addr; |
91 | int plen; | |
92 | }; | |
93 | ||
c71099ac TG |
94 | struct fib6_table; |
95 | ||
fd2c3ef7 | 96 | struct rt6_info { |
d8d1f30b | 97 | struct dst_entry dst; |
1da177e4 | 98 | |
bd2c77a0 YH |
99 | /* |
100 | * Tail elements of dst_entry (__refcnt etc.) | |
101 | * and these elements (rarely used in hot path) are in | |
102 | * the same cache line. | |
103 | */ | |
104 | struct fib6_table *rt6i_table; | |
1da177e4 LT |
105 | struct fib6_node *rt6i_node; |
106 | ||
107 | struct in6_addr rt6i_gateway; | |
1da177e4 | 108 | |
51ebd318 ND |
109 | /* Multipath routes: |
110 | * siblings is a list of rt6_info that have the the same metric/weight, | |
111 | * destination, but not the same gateway. nsiblings is just a cache | |
112 | * to speed up lookup. | |
113 | */ | |
114 | struct list_head rt6i_siblings; | |
115 | unsigned int rt6i_nsiblings; | |
116 | ||
bd2c77a0 | 117 | atomic_t rt6i_ref; |
a47ed4cd | 118 | |
bd2c77a0 YH |
119 | /* These are in a separate cache line. */ |
120 | struct rt6key rt6i_dst ____cacheline_aligned_in_smp; | |
121 | u32 rt6i_flags; | |
122 | struct rt6key rt6i_src; | |
c3968a85 | 123 | struct rt6key rt6i_prefsrc; |
b4ce9277 | 124 | |
8d0b94af MKL |
125 | struct list_head rt6i_uncached; |
126 | struct uncached_list *rt6i_uncached_list; | |
127 | ||
bd2c77a0 | 128 | struct inet6_dev *rt6i_idev; |
d52d3997 | 129 | struct rt6_info * __percpu *rt6i_pcpu; |
b4ce9277 | 130 | |
705f1c86 | 131 | u32 rt6i_metric; |
4b32b5ad | 132 | u32 rt6i_pmtu; |
bd2c77a0 YH |
133 | /* more non-fragment space at head required */ |
134 | unsigned short rt6i_nfheader_len; | |
bd2c77a0 | 135 | u8 rt6i_protocol; |
1da177e4 LT |
136 | }; |
137 | ||
7a3025b1 YH |
138 | static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) |
139 | { | |
140 | return ((struct rt6_info *)dst)->rt6i_idev; | |
141 | } | |
142 | ||
1716a961 G |
143 | static inline void rt6_clean_expires(struct rt6_info *rt) |
144 | { | |
1716a961 | 145 | rt->rt6i_flags &= ~RTF_EXPIRES; |
01ba16d6 | 146 | rt->dst.expires = 0; |
1716a961 G |
147 | } |
148 | ||
149 | static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires) | |
150 | { | |
1716a961 | 151 | rt->dst.expires = expires; |
ecd98837 | 152 | rt->rt6i_flags |= RTF_EXPIRES; |
1716a961 G |
153 | } |
154 | ||
ecd98837 | 155 | static inline void rt6_update_expires(struct rt6_info *rt0, int timeout) |
1716a961 | 156 | { |
ecd98837 YH |
157 | struct rt6_info *rt; |
158 | ||
159 | for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES); | |
160 | rt = (struct rt6_info *)rt->dst.from); | |
161 | if (rt && rt != rt0) | |
162 | rt0->dst.expires = rt->dst.expires; | |
163 | ||
164 | dst_set_expires(&rt0->dst, timeout); | |
165 | rt0->rt6i_flags |= RTF_EXPIRES; | |
1716a961 | 166 | } |
b197df4f MKL |
167 | |
168 | static inline u32 rt6_get_cookie(const struct rt6_info *rt) | |
169 | { | |
02bcf4e0 MKL |
170 | if (rt->rt6i_flags & RTF_PCPU || |
171 | (unlikely(rt->dst.flags & DST_NOCACHE) && rt->dst.from)) | |
3da59bd9 MKL |
172 | rt = (struct rt6_info *)(rt->dst.from); |
173 | ||
b197df4f MKL |
174 | return rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; |
175 | } | |
1716a961 | 176 | |
94e187c0 AW |
177 | static inline void ip6_rt_put(struct rt6_info *rt) |
178 | { | |
179 | /* dst_release() accepts a NULL parameter. | |
180 | * We rely on dst being first structure in struct rt6_info | |
181 | */ | |
182 | BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0); | |
183 | dst_release(&rt->dst); | |
184 | } | |
185 | ||
94b2cfe0 HFS |
186 | enum fib6_walk_state { |
187 | #ifdef CONFIG_IPV6_SUBTREES | |
188 | FWS_S, | |
189 | #endif | |
190 | FWS_L, | |
191 | FWS_R, | |
192 | FWS_C, | |
193 | FWS_U | |
194 | }; | |
195 | ||
196 | struct fib6_walker { | |
bbef49da | 197 | struct list_head lh; |
1da177e4 LT |
198 | struct fib6_node *root, *node; |
199 | struct rt6_info *leaf; | |
94b2cfe0 HFS |
200 | enum fib6_walk_state state; |
201 | bool prune; | |
2bec5a36 PM |
202 | unsigned int skip; |
203 | unsigned int count; | |
94b2cfe0 | 204 | int (*func)(struct fib6_walker *); |
1da177e4 LT |
205 | void *args; |
206 | }; | |
207 | ||
1da177e4 LT |
208 | struct rt6_statistics { |
209 | __u32 fib_nodes; | |
210 | __u32 fib_route_nodes; | |
211 | __u32 fib_rt_alloc; /* permanent routes */ | |
212 | __u32 fib_rt_entries; /* rt entries in table */ | |
213 | __u32 fib_rt_cache; /* cache routes */ | |
214 | __u32 fib_discarded_routes; | |
215 | }; | |
216 | ||
217 | #define RTN_TL_ROOT 0x0001 | |
218 | #define RTN_ROOT 0x0002 /* tree root node */ | |
219 | #define RTN_RTINFO 0x0004 /* node with valid routing info */ | |
220 | ||
221 | /* | |
222 | * priority levels (or metrics) | |
223 | * | |
224 | */ | |
225 | ||
1da177e4 | 226 | |
c71099ac TG |
227 | struct fib6_table { |
228 | struct hlist_node tb6_hlist; | |
229 | u32 tb6_id; | |
230 | rwlock_t tb6_lock; | |
231 | struct fib6_node tb6_root; | |
8e773277 | 232 | struct inet_peer_base tb6_peers; |
c71099ac TG |
233 | }; |
234 | ||
235 | #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC | |
236 | #define RT6_TABLE_MAIN RT_TABLE_MAIN | |
c71099ac TG |
237 | #define RT6_TABLE_DFLT RT6_TABLE_MAIN |
238 | #define RT6_TABLE_INFO RT6_TABLE_MAIN | |
239 | #define RT6_TABLE_PREFIX RT6_TABLE_MAIN | |
240 | ||
241 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
242 | #define FIB6_TABLE_MIN 1 | |
243 | #define FIB6_TABLE_MAX RT_TABLE_MAX | |
101367c2 | 244 | #define RT6_TABLE_LOCAL RT_TABLE_LOCAL |
c71099ac TG |
245 | #else |
246 | #define FIB6_TABLE_MIN RT_TABLE_MAIN | |
247 | #define FIB6_TABLE_MAX FIB6_TABLE_MIN | |
101367c2 | 248 | #define RT6_TABLE_LOCAL RT6_TABLE_MAIN |
c71099ac TG |
249 | #endif |
250 | ||
8ed67789 DL |
251 | typedef struct rt6_info *(*pol_lookup_t)(struct net *, |
252 | struct fib6_table *, | |
4c9483b2 | 253 | struct flowi6 *, int); |
1da177e4 LT |
254 | |
255 | /* | |
256 | * exported functions | |
257 | */ | |
258 | ||
5c3a0fd7 JP |
259 | struct fib6_table *fib6_get_table(struct net *net, u32 id); |
260 | struct fib6_table *fib6_new_table(struct net *net, u32 id); | |
261 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, | |
262 | int flags, pol_lookup_t lookup); | |
c71099ac | 263 | |
5c3a0fd7 JP |
264 | struct fib6_node *fib6_lookup(struct fib6_node *root, |
265 | const struct in6_addr *daddr, | |
266 | const struct in6_addr *saddr); | |
1da177e4 | 267 | |
5c3a0fd7 JP |
268 | struct fib6_node *fib6_locate(struct fib6_node *root, |
269 | const struct in6_addr *daddr, int dst_len, | |
270 | const struct in6_addr *saddr, int src_len); | |
1da177e4 | 271 | |
5c3a0fd7 | 272 | void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg), |
0c3584d5 | 273 | void *arg); |
c71099ac | 274 | |
e715b6d3 FW |
275 | int fib6_add(struct fib6_node *root, struct rt6_info *rt, |
276 | struct nl_info *info, struct mx6_config *mxc); | |
5c3a0fd7 | 277 | int fib6_del(struct rt6_info *rt, struct nl_info *info); |
1da177e4 | 278 | |
37a1d361 RP |
279 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
280 | unsigned int flags); | |
1da177e4 | 281 | |
5c3a0fd7 | 282 | void fib6_run_gc(unsigned long expires, struct net *net, bool force); |
1da177e4 | 283 | |
5c3a0fd7 | 284 | void fib6_gc_cleanup(void); |
1da177e4 | 285 | |
5c3a0fd7 | 286 | int fib6_init(void); |
101367c2 | 287 | |
8d2ca1d7 HFS |
288 | int ipv6_route_open(struct inode *inode, struct file *file); |
289 | ||
7e5449c2 | 290 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
5c3a0fd7 JP |
291 | int fib6_rules_init(void); |
292 | void fib6_rules_cleanup(void); | |
7e5449c2 DL |
293 | #else |
294 | static inline int fib6_rules_init(void) | |
295 | { | |
296 | return 0; | |
297 | } | |
298 | static inline void fib6_rules_cleanup(void) | |
299 | { | |
300 | return ; | |
301 | } | |
302 | #endif | |
1da177e4 | 303 | #endif |