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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> | |
16ab6d7d | 19 | #include <linux/notifier.h> |
86872cb5 TG |
20 | #include <net/dst.h> |
21 | #include <net/flow.h> | |
22 | #include <net/netlink.h> | |
b3419363 | 23 | #include <net/inetpeer.h> |
16ab6d7d | 24 | #include <net/fib_notifier.h> |
1da177e4 | 25 | |
a33bc5c1 NH |
26 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
27 | #define FIB6_TABLE_HASHSZ 256 | |
28 | #else | |
29 | #define FIB6_TABLE_HASHSZ 1 | |
30 | #endif | |
31 | ||
c757faa8 WW |
32 | #define RT6_DEBUG 2 |
33 | ||
34 | #if RT6_DEBUG >= 3 | |
35 | #define RT6_TRACE(x...) pr_debug(x) | |
36 | #else | |
37 | #define RT6_TRACE(x...) do { ; } while (0) | |
38 | #endif | |
39 | ||
1da177e4 LT |
40 | struct rt6_info; |
41 | ||
fd2c3ef7 | 42 | struct fib6_config { |
86872cb5 TG |
43 | u32 fc_table; |
44 | u32 fc_metric; | |
45 | int fc_dst_len; | |
46 | int fc_src_len; | |
47 | int fc_ifindex; | |
48 | u32 fc_flags; | |
49 | u32 fc_protocol; | |
0ae81335 DA |
50 | u16 fc_type; /* only 8 bits are used */ |
51 | u16 fc_delete_all_nh : 1, | |
52 | __unused : 15; | |
86872cb5 TG |
53 | |
54 | struct in6_addr fc_dst; | |
55 | struct in6_addr fc_src; | |
c3968a85 | 56 | struct in6_addr fc_prefsrc; |
86872cb5 TG |
57 | struct in6_addr fc_gateway; |
58 | ||
59 | unsigned long fc_expires; | |
60 | struct nlattr *fc_mx; | |
61 | int fc_mx_len; | |
51ebd318 ND |
62 | int fc_mp_len; |
63 | struct nlattr *fc_mp; | |
86872cb5 TG |
64 | |
65 | struct nl_info fc_nlinfo; | |
19e42e45 RP |
66 | struct nlattr *fc_encap; |
67 | u16 fc_encap_type; | |
86872cb5 TG |
68 | }; |
69 | ||
fd2c3ef7 | 70 | struct fib6_node { |
66f5d6ce WW |
71 | struct fib6_node __rcu *parent; |
72 | struct fib6_node __rcu *left; | |
73 | struct fib6_node __rcu *right; | |
8bce65b9 | 74 | #ifdef CONFIG_IPV6_SUBTREES |
66f5d6ce | 75 | struct fib6_node __rcu *subtree; |
8bce65b9 | 76 | #endif |
66f5d6ce | 77 | struct rt6_info __rcu *leaf; |
1da177e4 LT |
78 | |
79 | __u16 fn_bit; /* bit key */ | |
80 | __u16 fn_flags; | |
42b18706 | 81 | int fn_sernum; |
66f5d6ce | 82 | struct rt6_info __rcu *rr_ptr; |
c5cff856 | 83 | struct rcu_head rcu; |
1da177e4 LT |
84 | }; |
85 | ||
c757faa8 WW |
86 | struct fib6_gc_args { |
87 | int timeout; | |
88 | int more; | |
89 | }; | |
90 | ||
7fc33165 YH |
91 | #ifndef CONFIG_IPV6_SUBTREES |
92 | #define FIB6_SUBTREE(fn) NULL | |
93 | #else | |
66f5d6ce | 94 | #define FIB6_SUBTREE(fn) (rcu_dereference_protected((fn)->subtree, 1)) |
7fc33165 | 95 | #endif |
1da177e4 | 96 | |
e715b6d3 FW |
97 | struct mx6_config { |
98 | const u32 *mx; | |
99 | DECLARE_BITMAP(mx_valid, RTAX_MAX); | |
100 | }; | |
101 | ||
1da177e4 LT |
102 | /* |
103 | * routing information | |
104 | * | |
105 | */ | |
106 | ||
fd2c3ef7 | 107 | struct rt6key { |
1da177e4 LT |
108 | struct in6_addr addr; |
109 | int plen; | |
110 | }; | |
111 | ||
c71099ac TG |
112 | struct fib6_table; |
113 | ||
35732d01 WW |
114 | struct rt6_exception_bucket { |
115 | struct hlist_head chain; | |
116 | int depth; | |
117 | }; | |
118 | ||
119 | struct rt6_exception { | |
120 | struct hlist_node hlist; | |
121 | struct rt6_info *rt6i; | |
122 | unsigned long stamp; | |
123 | struct rcu_head rcu; | |
124 | }; | |
125 | ||
126 | #define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10 | |
127 | #define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT) | |
128 | #define FIB6_MAX_DEPTH 5 | |
129 | ||
fd2c3ef7 | 130 | struct rt6_info { |
d8d1f30b | 131 | struct dst_entry dst; |
1da177e4 | 132 | |
bd2c77a0 YH |
133 | /* |
134 | * Tail elements of dst_entry (__refcnt etc.) | |
135 | * and these elements (rarely used in hot path) are in | |
136 | * the same cache line. | |
137 | */ | |
138 | struct fib6_table *rt6i_table; | |
4e587ea7 | 139 | struct fib6_node __rcu *rt6i_node; |
1da177e4 LT |
140 | |
141 | struct in6_addr rt6i_gateway; | |
1da177e4 | 142 | |
51ebd318 ND |
143 | /* Multipath routes: |
144 | * siblings is a list of rt6_info that have the the same metric/weight, | |
145 | * destination, but not the same gateway. nsiblings is just a cache | |
146 | * to speed up lookup. | |
147 | */ | |
148 | struct list_head rt6i_siblings; | |
149 | unsigned int rt6i_nsiblings; | |
150 | ||
bd2c77a0 | 151 | atomic_t rt6i_ref; |
a47ed4cd | 152 | |
fe400799 IS |
153 | unsigned int rt6i_nh_flags; |
154 | ||
bd2c77a0 YH |
155 | /* These are in a separate cache line. */ |
156 | struct rt6key rt6i_dst ____cacheline_aligned_in_smp; | |
157 | u32 rt6i_flags; | |
158 | struct rt6key rt6i_src; | |
c3968a85 | 159 | struct rt6key rt6i_prefsrc; |
b4ce9277 | 160 | |
8d0b94af MKL |
161 | struct list_head rt6i_uncached; |
162 | struct uncached_list *rt6i_uncached_list; | |
163 | ||
bd2c77a0 | 164 | struct inet6_dev *rt6i_idev; |
d52d3997 | 165 | struct rt6_info * __percpu *rt6i_pcpu; |
35732d01 | 166 | struct rt6_exception_bucket __rcu *rt6i_exception_bucket; |
b4ce9277 | 167 | |
705f1c86 | 168 | u32 rt6i_metric; |
4b32b5ad | 169 | u32 rt6i_pmtu; |
bd2c77a0 YH |
170 | /* more non-fragment space at head required */ |
171 | unsigned short rt6i_nfheader_len; | |
bd2c77a0 | 172 | u8 rt6i_protocol; |
35732d01 WW |
173 | u8 exception_bucket_flushed:1, |
174 | unused:7; | |
1da177e4 LT |
175 | }; |
176 | ||
66f5d6ce WW |
177 | #define for_each_fib6_node_rt_rcu(fn) \ |
178 | for (rt = rcu_dereference((fn)->leaf); rt; \ | |
179 | rt = rcu_dereference(rt->dst.rt6_next)) | |
180 | ||
181 | #define for_each_fib6_walker_rt(w) \ | |
182 | for (rt = (w)->leaf; rt; \ | |
183 | rt = rcu_dereference_protected(rt->dst.rt6_next, 1)) | |
184 | ||
7a3025b1 YH |
185 | static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) |
186 | { | |
187 | return ((struct rt6_info *)dst)->rt6i_idev; | |
188 | } | |
189 | ||
1716a961 G |
190 | static inline void rt6_clean_expires(struct rt6_info *rt) |
191 | { | |
1716a961 | 192 | rt->rt6i_flags &= ~RTF_EXPIRES; |
01ba16d6 | 193 | rt->dst.expires = 0; |
1716a961 G |
194 | } |
195 | ||
196 | static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires) | |
197 | { | |
1716a961 | 198 | rt->dst.expires = expires; |
ecd98837 | 199 | rt->rt6i_flags |= RTF_EXPIRES; |
1716a961 G |
200 | } |
201 | ||
ecd98837 | 202 | static inline void rt6_update_expires(struct rt6_info *rt0, int timeout) |
1716a961 | 203 | { |
ecd98837 YH |
204 | struct rt6_info *rt; |
205 | ||
206 | for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES); | |
207 | rt = (struct rt6_info *)rt->dst.from); | |
208 | if (rt && rt != rt0) | |
209 | rt0->dst.expires = rt->dst.expires; | |
210 | ||
211 | dst_set_expires(&rt0->dst, timeout); | |
212 | rt0->rt6i_flags |= RTF_EXPIRES; | |
1716a961 | 213 | } |
b197df4f | 214 | |
c5cff856 WW |
215 | /* Function to safely get fn->sernum for passed in rt |
216 | * and store result in passed in cookie. | |
217 | * Return true if we can get cookie safely | |
218 | * Return false if not | |
219 | */ | |
220 | static inline bool rt6_get_cookie_safe(const struct rt6_info *rt, | |
221 | u32 *cookie) | |
222 | { | |
223 | struct fib6_node *fn; | |
224 | bool status = false; | |
225 | ||
226 | rcu_read_lock(); | |
227 | fn = rcu_dereference(rt->rt6i_node); | |
228 | ||
229 | if (fn) { | |
230 | *cookie = fn->fn_sernum; | |
bbd63f06 WW |
231 | /* pairs with smp_wmb() in fib6_update_sernum_upto_root() */ |
232 | smp_rmb(); | |
c5cff856 WW |
233 | status = true; |
234 | } | |
235 | ||
236 | rcu_read_unlock(); | |
237 | return status; | |
238 | } | |
239 | ||
b197df4f MKL |
240 | static inline u32 rt6_get_cookie(const struct rt6_info *rt) |
241 | { | |
c5cff856 WW |
242 | u32 cookie = 0; |
243 | ||
ced536e2 | 244 | if (rt->dst.from) |
3da59bd9 MKL |
245 | rt = (struct rt6_info *)(rt->dst.from); |
246 | ||
c5cff856 WW |
247 | rt6_get_cookie_safe(rt, &cookie); |
248 | ||
249 | return cookie; | |
b197df4f | 250 | } |
1716a961 | 251 | |
94e187c0 AW |
252 | static inline void ip6_rt_put(struct rt6_info *rt) |
253 | { | |
254 | /* dst_release() accepts a NULL parameter. | |
255 | * We rely on dst being first structure in struct rt6_info | |
256 | */ | |
257 | BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0); | |
258 | dst_release(&rt->dst); | |
259 | } | |
260 | ||
a460aa83 IS |
261 | void rt6_free_pcpu(struct rt6_info *non_pcpu_rt); |
262 | ||
263 | static inline void rt6_hold(struct rt6_info *rt) | |
264 | { | |
265 | atomic_inc(&rt->rt6i_ref); | |
266 | } | |
267 | ||
268 | static inline void rt6_release(struct rt6_info *rt) | |
269 | { | |
270 | if (atomic_dec_and_test(&rt->rt6i_ref)) { | |
271 | rt6_free_pcpu(rt); | |
272 | dst_dev_put(&rt->dst); | |
273 | dst_release(&rt->dst); | |
274 | } | |
275 | } | |
276 | ||
94b2cfe0 HFS |
277 | enum fib6_walk_state { |
278 | #ifdef CONFIG_IPV6_SUBTREES | |
279 | FWS_S, | |
280 | #endif | |
281 | FWS_L, | |
282 | FWS_R, | |
283 | FWS_C, | |
284 | FWS_U | |
285 | }; | |
286 | ||
287 | struct fib6_walker { | |
bbef49da | 288 | struct list_head lh; |
1da177e4 LT |
289 | struct fib6_node *root, *node; |
290 | struct rt6_info *leaf; | |
94b2cfe0 | 291 | enum fib6_walk_state state; |
2bec5a36 PM |
292 | unsigned int skip; |
293 | unsigned int count; | |
94b2cfe0 | 294 | int (*func)(struct fib6_walker *); |
1da177e4 LT |
295 | void *args; |
296 | }; | |
297 | ||
1da177e4 | 298 | struct rt6_statistics { |
81eb8447 WW |
299 | __u32 fib_nodes; /* all fib6 nodes */ |
300 | __u32 fib_route_nodes; /* intermediate nodes */ | |
301 | __u32 fib_rt_entries; /* rt entries in fib table */ | |
302 | __u32 fib_rt_cache; /* cached rt entries in exception table */ | |
303 | __u32 fib_discarded_routes; /* total number of routes delete */ | |
304 | ||
305 | /* The following stats are not protected by any lock */ | |
306 | atomic_t fib_rt_alloc; /* total number of routes alloced */ | |
307 | atomic_t fib_rt_uncache; /* rt entries in uncached list */ | |
1da177e4 LT |
308 | }; |
309 | ||
310 | #define RTN_TL_ROOT 0x0001 | |
311 | #define RTN_ROOT 0x0002 /* tree root node */ | |
312 | #define RTN_RTINFO 0x0004 /* node with valid routing info */ | |
313 | ||
314 | /* | |
315 | * priority levels (or metrics) | |
316 | * | |
317 | */ | |
318 | ||
1da177e4 | 319 | |
c71099ac TG |
320 | struct fib6_table { |
321 | struct hlist_node tb6_hlist; | |
322 | u32 tb6_id; | |
66f5d6ce | 323 | spinlock_t tb6_lock; |
c71099ac | 324 | struct fib6_node tb6_root; |
8e773277 | 325 | struct inet_peer_base tb6_peers; |
830218c1 | 326 | unsigned int flags; |
e1ee0a5b | 327 | unsigned int fib_seq; |
830218c1 | 328 | #define RT6_TABLE_HAS_DFLT_ROUTER BIT(0) |
c71099ac TG |
329 | }; |
330 | ||
331 | #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC | |
332 | #define RT6_TABLE_MAIN RT_TABLE_MAIN | |
c71099ac TG |
333 | #define RT6_TABLE_DFLT RT6_TABLE_MAIN |
334 | #define RT6_TABLE_INFO RT6_TABLE_MAIN | |
335 | #define RT6_TABLE_PREFIX RT6_TABLE_MAIN | |
336 | ||
337 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
338 | #define FIB6_TABLE_MIN 1 | |
339 | #define FIB6_TABLE_MAX RT_TABLE_MAX | |
101367c2 | 340 | #define RT6_TABLE_LOCAL RT_TABLE_LOCAL |
c71099ac TG |
341 | #else |
342 | #define FIB6_TABLE_MIN RT_TABLE_MAIN | |
343 | #define FIB6_TABLE_MAX FIB6_TABLE_MIN | |
101367c2 | 344 | #define RT6_TABLE_LOCAL RT6_TABLE_MAIN |
c71099ac TG |
345 | #endif |
346 | ||
8ed67789 DL |
347 | typedef struct rt6_info *(*pol_lookup_t)(struct net *, |
348 | struct fib6_table *, | |
4c9483b2 | 349 | struct flowi6 *, int); |
1da177e4 | 350 | |
df77fe4d IS |
351 | struct fib6_entry_notifier_info { |
352 | struct fib_notifier_info info; /* must be first */ | |
353 | struct rt6_info *rt; | |
354 | }; | |
355 | ||
1da177e4 LT |
356 | /* |
357 | * exported functions | |
358 | */ | |
359 | ||
5c3a0fd7 JP |
360 | struct fib6_table *fib6_get_table(struct net *net, u32 id); |
361 | struct fib6_table *fib6_new_table(struct net *net, u32 id); | |
362 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, | |
363 | int flags, pol_lookup_t lookup); | |
c71099ac | 364 | |
5c3a0fd7 JP |
365 | struct fib6_node *fib6_lookup(struct fib6_node *root, |
366 | const struct in6_addr *daddr, | |
367 | const struct in6_addr *saddr); | |
1da177e4 | 368 | |
5c3a0fd7 JP |
369 | struct fib6_node *fib6_locate(struct fib6_node *root, |
370 | const struct in6_addr *daddr, int dst_len, | |
38fbeeee WW |
371 | const struct in6_addr *saddr, int src_len, |
372 | bool exact_match); | |
1da177e4 | 373 | |
5c3a0fd7 | 374 | void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg), |
0c3584d5 | 375 | void *arg); |
c71099ac | 376 | |
e715b6d3 | 377 | int fib6_add(struct fib6_node *root, struct rt6_info *rt, |
333c4301 DA |
378 | struct nl_info *info, struct mx6_config *mxc, |
379 | struct netlink_ext_ack *extack); | |
5c3a0fd7 | 380 | int fib6_del(struct rt6_info *rt, struct nl_info *info); |
1da177e4 | 381 | |
37a1d361 RP |
382 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
383 | unsigned int flags); | |
1da177e4 | 384 | |
5c3a0fd7 | 385 | void fib6_run_gc(unsigned long expires, struct net *net, bool force); |
1da177e4 | 386 | |
5c3a0fd7 | 387 | void fib6_gc_cleanup(void); |
1da177e4 | 388 | |
5c3a0fd7 | 389 | int fib6_init(void); |
101367c2 | 390 | |
8d2ca1d7 HFS |
391 | int ipv6_route_open(struct inode *inode, struct file *file); |
392 | ||
16ab6d7d IS |
393 | int call_fib6_notifier(struct notifier_block *nb, struct net *net, |
394 | enum fib_event_type event_type, | |
395 | struct fib_notifier_info *info); | |
396 | int call_fib6_notifiers(struct net *net, enum fib_event_type event_type, | |
397 | struct fib_notifier_info *info); | |
398 | ||
399 | int __net_init fib6_notifier_init(struct net *net); | |
400 | void __net_exit fib6_notifier_exit(struct net *net); | |
401 | ||
e1ee0a5b IS |
402 | unsigned int fib6_tables_seq_read(struct net *net); |
403 | int fib6_tables_dump(struct net *net, struct notifier_block *nb); | |
404 | ||
180ca444 WW |
405 | void fib6_update_sernum(struct rt6_info *rt); |
406 | ||
7e5449c2 | 407 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
5c3a0fd7 JP |
408 | int fib6_rules_init(void); |
409 | void fib6_rules_cleanup(void); | |
e3ea9731 | 410 | bool fib6_rule_default(const struct fib_rule *rule); |
dcb18f76 IS |
411 | int fib6_rules_dump(struct net *net, struct notifier_block *nb); |
412 | unsigned int fib6_rules_seq_read(struct net *net); | |
7e5449c2 DL |
413 | #else |
414 | static inline int fib6_rules_init(void) | |
415 | { | |
416 | return 0; | |
417 | } | |
418 | static inline void fib6_rules_cleanup(void) | |
419 | { | |
420 | return ; | |
421 | } | |
e3ea9731 IS |
422 | static inline bool fib6_rule_default(const struct fib_rule *rule) |
423 | { | |
424 | return true; | |
425 | } | |
dcb18f76 IS |
426 | static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb) |
427 | { | |
428 | return 0; | |
429 | } | |
430 | static inline unsigned int fib6_rules_seq_read(struct net *net) | |
431 | { | |
432 | return 0; | |
433 | } | |
7e5449c2 | 434 | #endif |
1da177e4 | 435 | #endif |