Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * xfrm_state.c | |
3 | * | |
4 | * Changes: | |
5 | * Mitsuru KANDA @USAGI | |
6 | * Kazunori MIYAZAWA @USAGI | |
7 | * Kunihiro Ishiguro <kunihiro@ipinfusion.com> | |
8 | * IPv6 support | |
9 | * YOSHIFUJI Hideaki @USAGI | |
10 | * Split up af-specific functions | |
11 | * Derek Atkins <derek@ihtfp.com> | |
12 | * Add UDP Encapsulation | |
df71837d | 13 | * |
1da177e4 LT |
14 | */ |
15 | ||
16 | #include <linux/workqueue.h> | |
17 | #include <net/xfrm.h> | |
18 | #include <linux/pfkeyv2.h> | |
19 | #include <linux/ipsec.h> | |
20 | #include <linux/module.h> | |
f034b5d4 | 21 | #include <linux/cache.h> |
1da177e4 LT |
22 | #include <asm/uaccess.h> |
23 | ||
44e36b42 DM |
24 | #include "xfrm_hash.h" |
25 | ||
ee857a7d DM |
26 | struct sock *xfrm_nl; |
27 | EXPORT_SYMBOL(xfrm_nl); | |
28 | ||
f8cd5488 | 29 | u32 sysctl_xfrm_aevent_etime = XFRM_AE_ETIME; |
a70fcb0b DM |
30 | EXPORT_SYMBOL(sysctl_xfrm_aevent_etime); |
31 | ||
f8cd5488 | 32 | u32 sysctl_xfrm_aevent_rseqth = XFRM_AE_SEQT_SIZE; |
a70fcb0b DM |
33 | EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth); |
34 | ||
1da177e4 LT |
35 | /* Each xfrm_state may be linked to two tables: |
36 | ||
37 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
a624c108 | 38 | 2. Hash table by (daddr,family,reqid) to find what SAs exist for given |
1da177e4 LT |
39 | destination/tunnel endpoint. (output) |
40 | */ | |
41 | ||
42 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
43 | ||
44 | /* Hash table to find appropriate SA towards given target (endpoint | |
45 | * of tunnel or destination of transport mode) allowed by selector. | |
46 | * | |
47 | * Main use is finding SA after policy selected tunnel or transport mode. | |
48 | * Also, it can be used by ah/esp icmp error handler to find offending SA. | |
49 | */ | |
f034b5d4 DM |
50 | static struct hlist_head *xfrm_state_bydst __read_mostly; |
51 | static struct hlist_head *xfrm_state_bysrc __read_mostly; | |
52 | static struct hlist_head *xfrm_state_byspi __read_mostly; | |
53 | static unsigned int xfrm_state_hmask __read_mostly; | |
54 | static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; | |
55 | static unsigned int xfrm_state_num; | |
9d4a706d | 56 | static unsigned int xfrm_state_genid; |
f034b5d4 | 57 | |
c1969f29 DM |
58 | static inline unsigned int xfrm_dst_hash(xfrm_address_t *daddr, |
59 | xfrm_address_t *saddr, | |
60 | u32 reqid, | |
a624c108 | 61 | unsigned short family) |
f034b5d4 | 62 | { |
c1969f29 | 63 | return __xfrm_dst_hash(daddr, saddr, reqid, family, xfrm_state_hmask); |
f034b5d4 DM |
64 | } |
65 | ||
44e36b42 DM |
66 | static inline unsigned int xfrm_src_hash(xfrm_address_t *addr, |
67 | unsigned short family) | |
f034b5d4 | 68 | { |
a624c108 | 69 | return __xfrm_src_hash(addr, family, xfrm_state_hmask); |
f034b5d4 DM |
70 | } |
71 | ||
f034b5d4 | 72 | static inline unsigned int |
c1969f29 | 73 | xfrm_spi_hash(xfrm_address_t *daddr, u32 spi, u8 proto, unsigned short family) |
f034b5d4 | 74 | { |
c1969f29 | 75 | return __xfrm_spi_hash(daddr, spi, proto, family, xfrm_state_hmask); |
f034b5d4 DM |
76 | } |
77 | ||
f034b5d4 DM |
78 | static void xfrm_hash_transfer(struct hlist_head *list, |
79 | struct hlist_head *ndsttable, | |
80 | struct hlist_head *nsrctable, | |
81 | struct hlist_head *nspitable, | |
82 | unsigned int nhashmask) | |
83 | { | |
84 | struct hlist_node *entry, *tmp; | |
85 | struct xfrm_state *x; | |
86 | ||
87 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
88 | unsigned int h; | |
89 | ||
c1969f29 DM |
90 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
91 | x->props.reqid, x->props.family, | |
92 | nhashmask); | |
f034b5d4 DM |
93 | hlist_add_head(&x->bydst, ndsttable+h); |
94 | ||
95 | h = __xfrm_src_hash(&x->props.saddr, x->props.family, | |
96 | nhashmask); | |
97 | hlist_add_head(&x->bysrc, nsrctable+h); | |
98 | ||
99 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, | |
100 | x->props.family, nhashmask); | |
101 | hlist_add_head(&x->byspi, nspitable+h); | |
102 | } | |
103 | } | |
104 | ||
105 | static unsigned long xfrm_hash_new_size(void) | |
106 | { | |
107 | return ((xfrm_state_hmask + 1) << 1) * | |
108 | sizeof(struct hlist_head); | |
109 | } | |
110 | ||
111 | static DEFINE_MUTEX(hash_resize_mutex); | |
112 | ||
113 | static void xfrm_hash_resize(void *__unused) | |
114 | { | |
115 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; | |
116 | unsigned long nsize, osize; | |
117 | unsigned int nhashmask, ohashmask; | |
118 | int i; | |
119 | ||
120 | mutex_lock(&hash_resize_mutex); | |
121 | ||
122 | nsize = xfrm_hash_new_size(); | |
44e36b42 | 123 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
124 | if (!ndst) |
125 | goto out_unlock; | |
44e36b42 | 126 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 127 | if (!nsrc) { |
44e36b42 | 128 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
129 | goto out_unlock; |
130 | } | |
44e36b42 | 131 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 132 | if (!nspi) { |
44e36b42 DM |
133 | xfrm_hash_free(ndst, nsize); |
134 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
135 | goto out_unlock; |
136 | } | |
137 | ||
138 | spin_lock_bh(&xfrm_state_lock); | |
139 | ||
140 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
141 | for (i = xfrm_state_hmask; i >= 0; i--) | |
142 | xfrm_hash_transfer(xfrm_state_bydst+i, ndst, nsrc, nspi, | |
143 | nhashmask); | |
144 | ||
145 | odst = xfrm_state_bydst; | |
146 | osrc = xfrm_state_bysrc; | |
147 | ospi = xfrm_state_byspi; | |
148 | ohashmask = xfrm_state_hmask; | |
149 | ||
150 | xfrm_state_bydst = ndst; | |
151 | xfrm_state_bysrc = nsrc; | |
152 | xfrm_state_byspi = nspi; | |
153 | xfrm_state_hmask = nhashmask; | |
154 | ||
155 | spin_unlock_bh(&xfrm_state_lock); | |
156 | ||
157 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
158 | xfrm_hash_free(odst, osize); |
159 | xfrm_hash_free(osrc, osize); | |
160 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
161 | |
162 | out_unlock: | |
163 | mutex_unlock(&hash_resize_mutex); | |
164 | } | |
165 | ||
166 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize, NULL); | |
167 | ||
1da177e4 LT |
168 | DECLARE_WAIT_QUEUE_HEAD(km_waitq); |
169 | EXPORT_SYMBOL(km_waitq); | |
170 | ||
171 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); | |
172 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
173 | ||
174 | static struct work_struct xfrm_state_gc_work; | |
8f126e37 | 175 | static HLIST_HEAD(xfrm_state_gc_list); |
1da177e4 LT |
176 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
177 | ||
53bc6b4d | 178 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 LT |
179 | |
180 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family); | |
181 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
182 | ||
980ebd25 | 183 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 184 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 LT |
185 | |
186 | static void xfrm_state_gc_destroy(struct xfrm_state *x) | |
187 | { | |
a47f0ce0 DM |
188 | del_timer_sync(&x->timer); |
189 | del_timer_sync(&x->rtimer); | |
a51482bd JJ |
190 | kfree(x->aalg); |
191 | kfree(x->ealg); | |
192 | kfree(x->calg); | |
193 | kfree(x->encap); | |
060f02a3 | 194 | kfree(x->coaddr); |
b59f45d0 HX |
195 | if (x->mode) |
196 | xfrm_put_mode(x->mode); | |
1da177e4 LT |
197 | if (x->type) { |
198 | x->type->destructor(x); | |
199 | xfrm_put_type(x->type); | |
200 | } | |
df71837d | 201 | security_xfrm_state_free(x); |
1da177e4 LT |
202 | kfree(x); |
203 | } | |
204 | ||
205 | static void xfrm_state_gc_task(void *data) | |
206 | { | |
207 | struct xfrm_state *x; | |
8f126e37 DM |
208 | struct hlist_node *entry, *tmp; |
209 | struct hlist_head gc_list; | |
1da177e4 | 210 | |
1da177e4 | 211 | spin_lock_bh(&xfrm_state_gc_lock); |
8f126e37 DM |
212 | gc_list.first = xfrm_state_gc_list.first; |
213 | INIT_HLIST_HEAD(&xfrm_state_gc_list); | |
1da177e4 LT |
214 | spin_unlock_bh(&xfrm_state_gc_lock); |
215 | ||
8f126e37 | 216 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, bydst) |
1da177e4 | 217 | xfrm_state_gc_destroy(x); |
8f126e37 | 218 | |
1da177e4 LT |
219 | wake_up(&km_waitq); |
220 | } | |
221 | ||
222 | static inline unsigned long make_jiffies(long secs) | |
223 | { | |
224 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
225 | return MAX_SCHEDULE_TIMEOUT-1; | |
226 | else | |
227 | return secs*HZ; | |
228 | } | |
229 | ||
230 | static void xfrm_timer_handler(unsigned long data) | |
231 | { | |
232 | struct xfrm_state *x = (struct xfrm_state*)data; | |
233 | unsigned long now = (unsigned long)xtime.tv_sec; | |
234 | long next = LONG_MAX; | |
235 | int warn = 0; | |
236 | ||
237 | spin_lock(&x->lock); | |
238 | if (x->km.state == XFRM_STATE_DEAD) | |
239 | goto out; | |
240 | if (x->km.state == XFRM_STATE_EXPIRED) | |
241 | goto expired; | |
242 | if (x->lft.hard_add_expires_seconds) { | |
243 | long tmo = x->lft.hard_add_expires_seconds + | |
244 | x->curlft.add_time - now; | |
245 | if (tmo <= 0) | |
246 | goto expired; | |
247 | if (tmo < next) | |
248 | next = tmo; | |
249 | } | |
250 | if (x->lft.hard_use_expires_seconds) { | |
251 | long tmo = x->lft.hard_use_expires_seconds + | |
252 | (x->curlft.use_time ? : now) - now; | |
253 | if (tmo <= 0) | |
254 | goto expired; | |
255 | if (tmo < next) | |
256 | next = tmo; | |
257 | } | |
258 | if (x->km.dying) | |
259 | goto resched; | |
260 | if (x->lft.soft_add_expires_seconds) { | |
261 | long tmo = x->lft.soft_add_expires_seconds + | |
262 | x->curlft.add_time - now; | |
263 | if (tmo <= 0) | |
264 | warn = 1; | |
265 | else if (tmo < next) | |
266 | next = tmo; | |
267 | } | |
268 | if (x->lft.soft_use_expires_seconds) { | |
269 | long tmo = x->lft.soft_use_expires_seconds + | |
270 | (x->curlft.use_time ? : now) - now; | |
271 | if (tmo <= 0) | |
272 | warn = 1; | |
273 | else if (tmo < next) | |
274 | next = tmo; | |
275 | } | |
276 | ||
4666faab | 277 | x->km.dying = warn; |
1da177e4 | 278 | if (warn) |
53bc6b4d | 279 | km_state_expired(x, 0, 0); |
1da177e4 | 280 | resched: |
a47f0ce0 DM |
281 | if (next != LONG_MAX) |
282 | mod_timer(&x->timer, jiffies + make_jiffies(next)); | |
283 | ||
1da177e4 LT |
284 | goto out; |
285 | ||
286 | expired: | |
287 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
288 | x->km.state = XFRM_STATE_EXPIRED; | |
289 | wake_up(&km_waitq); | |
290 | next = 2; | |
291 | goto resched; | |
292 | } | |
4666faab | 293 | if (!__xfrm_state_delete(x) && x->id.spi) |
53bc6b4d | 294 | km_state_expired(x, 1, 0); |
1da177e4 LT |
295 | |
296 | out: | |
297 | spin_unlock(&x->lock); | |
1da177e4 LT |
298 | } |
299 | ||
0ac84752 DM |
300 | static void xfrm_replay_timer_handler(unsigned long data); |
301 | ||
1da177e4 LT |
302 | struct xfrm_state *xfrm_state_alloc(void) |
303 | { | |
304 | struct xfrm_state *x; | |
305 | ||
0da974f4 | 306 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
307 | |
308 | if (x) { | |
1da177e4 LT |
309 | atomic_set(&x->refcnt, 1); |
310 | atomic_set(&x->tunnel_users, 0); | |
8f126e37 DM |
311 | INIT_HLIST_NODE(&x->bydst); |
312 | INIT_HLIST_NODE(&x->bysrc); | |
313 | INIT_HLIST_NODE(&x->byspi); | |
1da177e4 LT |
314 | init_timer(&x->timer); |
315 | x->timer.function = xfrm_timer_handler; | |
316 | x->timer.data = (unsigned long)x; | |
f8cd5488 JHS |
317 | init_timer(&x->rtimer); |
318 | x->rtimer.function = xfrm_replay_timer_handler; | |
319 | x->rtimer.data = (unsigned long)x; | |
1da177e4 LT |
320 | x->curlft.add_time = (unsigned long)xtime.tv_sec; |
321 | x->lft.soft_byte_limit = XFRM_INF; | |
322 | x->lft.soft_packet_limit = XFRM_INF; | |
323 | x->lft.hard_byte_limit = XFRM_INF; | |
324 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
325 | x->replay_maxage = 0; |
326 | x->replay_maxdiff = 0; | |
1da177e4 LT |
327 | spin_lock_init(&x->lock); |
328 | } | |
329 | return x; | |
330 | } | |
331 | EXPORT_SYMBOL(xfrm_state_alloc); | |
332 | ||
333 | void __xfrm_state_destroy(struct xfrm_state *x) | |
334 | { | |
335 | BUG_TRAP(x->km.state == XFRM_STATE_DEAD); | |
336 | ||
337 | spin_lock_bh(&xfrm_state_gc_lock); | |
8f126e37 | 338 | hlist_add_head(&x->bydst, &xfrm_state_gc_list); |
1da177e4 LT |
339 | spin_unlock_bh(&xfrm_state_gc_lock); |
340 | schedule_work(&xfrm_state_gc_work); | |
341 | } | |
342 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
343 | ||
53bc6b4d | 344 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 345 | { |
26b15dad JHS |
346 | int err = -ESRCH; |
347 | ||
1da177e4 LT |
348 | if (x->km.state != XFRM_STATE_DEAD) { |
349 | x->km.state = XFRM_STATE_DEAD; | |
350 | spin_lock(&xfrm_state_lock); | |
8f126e37 | 351 | hlist_del(&x->bydst); |
8f126e37 | 352 | hlist_del(&x->bysrc); |
a47f0ce0 | 353 | if (x->id.spi) |
8f126e37 | 354 | hlist_del(&x->byspi); |
f034b5d4 | 355 | xfrm_state_num--; |
1da177e4 | 356 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 357 | |
1da177e4 LT |
358 | /* All xfrm_state objects are created by xfrm_state_alloc. |
359 | * The xfrm_state_alloc call gives a reference, and that | |
360 | * is what we are dropping here. | |
361 | */ | |
21380b81 | 362 | __xfrm_state_put(x); |
26b15dad | 363 | err = 0; |
1da177e4 | 364 | } |
26b15dad JHS |
365 | |
366 | return err; | |
1da177e4 | 367 | } |
53bc6b4d | 368 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 369 | |
26b15dad | 370 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 371 | { |
26b15dad JHS |
372 | int err; |
373 | ||
1da177e4 | 374 | spin_lock_bh(&x->lock); |
26b15dad | 375 | err = __xfrm_state_delete(x); |
1da177e4 | 376 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
377 | |
378 | return err; | |
1da177e4 LT |
379 | } |
380 | EXPORT_SYMBOL(xfrm_state_delete); | |
381 | ||
382 | void xfrm_state_flush(u8 proto) | |
383 | { | |
384 | int i; | |
1da177e4 LT |
385 | |
386 | spin_lock_bh(&xfrm_state_lock); | |
a9917c06 | 387 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 DM |
388 | struct hlist_node *entry; |
389 | struct xfrm_state *x; | |
1da177e4 | 390 | restart: |
8f126e37 | 391 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
1da177e4 | 392 | if (!xfrm_state_kern(x) && |
5794708f | 393 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
394 | xfrm_state_hold(x); |
395 | spin_unlock_bh(&xfrm_state_lock); | |
396 | ||
397 | xfrm_state_delete(x); | |
398 | xfrm_state_put(x); | |
399 | ||
400 | spin_lock_bh(&xfrm_state_lock); | |
401 | goto restart; | |
402 | } | |
403 | } | |
404 | } | |
405 | spin_unlock_bh(&xfrm_state_lock); | |
406 | wake_up(&km_waitq); | |
407 | } | |
408 | EXPORT_SYMBOL(xfrm_state_flush); | |
409 | ||
410 | static int | |
411 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
412 | struct xfrm_tmpl *tmpl, | |
413 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
414 | unsigned short family) | |
415 | { | |
416 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
417 | if (!afinfo) | |
418 | return -1; | |
419 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
420 | xfrm_state_put_afinfo(afinfo); | |
421 | return 0; | |
422 | } | |
423 | ||
a94cfd19 | 424 | static struct xfrm_state *__xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
edcd5821 DM |
425 | { |
426 | unsigned int h = xfrm_spi_hash(daddr, spi, proto, family); | |
427 | struct xfrm_state *x; | |
8f126e37 | 428 | struct hlist_node *entry; |
edcd5821 | 429 | |
8f126e37 | 430 | hlist_for_each_entry(x, entry, xfrm_state_byspi+h, byspi) { |
edcd5821 DM |
431 | if (x->props.family != family || |
432 | x->id.spi != spi || | |
433 | x->id.proto != proto) | |
434 | continue; | |
435 | ||
436 | switch (family) { | |
437 | case AF_INET: | |
438 | if (x->id.daddr.a4 != daddr->a4) | |
439 | continue; | |
440 | break; | |
441 | case AF_INET6: | |
442 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
443 | (struct in6_addr *) | |
444 | x->id.daddr.a6)) | |
445 | continue; | |
446 | break; | |
447 | }; | |
448 | ||
449 | xfrm_state_hold(x); | |
450 | return x; | |
451 | } | |
452 | ||
453 | return NULL; | |
454 | } | |
455 | ||
456 | static struct xfrm_state *__xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family) | |
457 | { | |
458 | unsigned int h = xfrm_src_hash(saddr, family); | |
459 | struct xfrm_state *x; | |
8f126e37 | 460 | struct hlist_node *entry; |
edcd5821 | 461 | |
8f126e37 | 462 | hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) { |
edcd5821 DM |
463 | if (x->props.family != family || |
464 | x->id.proto != proto) | |
465 | continue; | |
466 | ||
467 | switch (family) { | |
468 | case AF_INET: | |
469 | if (x->id.daddr.a4 != daddr->a4 || | |
470 | x->props.saddr.a4 != saddr->a4) | |
471 | continue; | |
472 | break; | |
473 | case AF_INET6: | |
474 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
475 | (struct in6_addr *) | |
476 | x->id.daddr.a6) || | |
477 | !ipv6_addr_equal((struct in6_addr *)saddr, | |
478 | (struct in6_addr *) | |
479 | x->props.saddr.a6)) | |
480 | continue; | |
481 | break; | |
482 | }; | |
483 | ||
484 | xfrm_state_hold(x); | |
485 | return x; | |
486 | } | |
487 | ||
488 | return NULL; | |
489 | } | |
490 | ||
491 | static inline struct xfrm_state * | |
492 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
493 | { | |
494 | if (use_spi) | |
495 | return __xfrm_state_lookup(&x->id.daddr, x->id.spi, | |
496 | x->id.proto, family); | |
497 | else | |
498 | return __xfrm_state_lookup_byaddr(&x->id.daddr, | |
499 | &x->props.saddr, | |
500 | x->id.proto, family); | |
501 | } | |
502 | ||
1da177e4 LT |
503 | struct xfrm_state * |
504 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
505 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
506 | struct xfrm_policy *pol, int *err, | |
507 | unsigned short family) | |
508 | { | |
c1969f29 | 509 | unsigned int h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family); |
8f126e37 | 510 | struct hlist_node *entry; |
1da177e4 LT |
511 | struct xfrm_state *x, *x0; |
512 | int acquire_in_progress = 0; | |
513 | int error = 0; | |
514 | struct xfrm_state *best = NULL; | |
1da177e4 | 515 | |
1da177e4 | 516 | spin_lock_bh(&xfrm_state_lock); |
8f126e37 | 517 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
1da177e4 LT |
518 | if (x->props.family == family && |
519 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 520 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
521 | xfrm_state_addr_check(x, daddr, saddr, family) && |
522 | tmpl->mode == x->props.mode && | |
523 | tmpl->id.proto == x->id.proto && | |
524 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { | |
525 | /* Resolution logic: | |
526 | 1. There is a valid state with matching selector. | |
527 | Done. | |
528 | 2. Valid state with inappropriate selector. Skip. | |
529 | ||
530 | Entering area of "sysdeps". | |
531 | ||
532 | 3. If state is not valid, selector is temporary, | |
533 | it selects only session which triggered | |
534 | previous resolution. Key manager will do | |
535 | something to install a state with proper | |
536 | selector. | |
537 | */ | |
538 | if (x->km.state == XFRM_STATE_VALID) { | |
df71837d | 539 | if (!xfrm_selector_match(&x->sel, fl, family) || |
e0d1caa7 | 540 | !security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
541 | continue; |
542 | if (!best || | |
543 | best->km.dying > x->km.dying || | |
544 | (best->km.dying == x->km.dying && | |
545 | best->curlft.add_time < x->curlft.add_time)) | |
546 | best = x; | |
547 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
548 | acquire_in_progress = 1; | |
549 | } else if (x->km.state == XFRM_STATE_ERROR || | |
550 | x->km.state == XFRM_STATE_EXPIRED) { | |
df71837d | 551 | if (xfrm_selector_match(&x->sel, fl, family) && |
e0d1caa7 | 552 | security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
553 | error = -ESRCH; |
554 | } | |
555 | } | |
556 | } | |
557 | ||
558 | x = best; | |
559 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 560 | if (tmpl->id.spi && |
edcd5821 DM |
561 | (x0 = __xfrm_state_lookup(daddr, tmpl->id.spi, |
562 | tmpl->id.proto, family)) != NULL) { | |
1da177e4 LT |
563 | xfrm_state_put(x0); |
564 | error = -EEXIST; | |
565 | goto out; | |
566 | } | |
567 | x = xfrm_state_alloc(); | |
568 | if (x == NULL) { | |
569 | error = -ENOMEM; | |
570 | goto out; | |
571 | } | |
572 | /* Initialize temporary selector matching only | |
573 | * to current session. */ | |
574 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
575 | ||
e0d1caa7 VY |
576 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
577 | if (error) { | |
578 | x->km.state = XFRM_STATE_DEAD; | |
579 | xfrm_state_put(x); | |
580 | x = NULL; | |
581 | goto out; | |
582 | } | |
583 | ||
1da177e4 LT |
584 | if (km_query(x, tmpl, pol) == 0) { |
585 | x->km.state = XFRM_STATE_ACQ; | |
8f126e37 | 586 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
8f126e37 DM |
587 | h = xfrm_src_hash(saddr, family); |
588 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); | |
1da177e4 LT |
589 | if (x->id.spi) { |
590 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family); | |
8f126e37 | 591 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
1da177e4 LT |
592 | } |
593 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
1da177e4 LT |
594 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; |
595 | add_timer(&x->timer); | |
596 | } else { | |
597 | x->km.state = XFRM_STATE_DEAD; | |
598 | xfrm_state_put(x); | |
599 | x = NULL; | |
600 | error = -ESRCH; | |
601 | } | |
602 | } | |
603 | out: | |
604 | if (x) | |
605 | xfrm_state_hold(x); | |
606 | else | |
607 | *err = acquire_in_progress ? -EAGAIN : error; | |
608 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
609 | return x; |
610 | } | |
611 | ||
612 | static void __xfrm_state_insert(struct xfrm_state *x) | |
613 | { | |
a624c108 | 614 | unsigned int h; |
1da177e4 | 615 | |
9d4a706d DM |
616 | x->genid = ++xfrm_state_genid; |
617 | ||
c1969f29 DM |
618 | h = xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
619 | x->props.reqid, x->props.family); | |
8f126e37 | 620 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
1da177e4 | 621 | |
6c44e6b7 | 622 | h = xfrm_src_hash(&x->props.saddr, x->props.family); |
8f126e37 | 623 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
1da177e4 | 624 | |
6c44e6b7 MN |
625 | if (xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY)) { |
626 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, | |
627 | x->props.family); | |
628 | ||
8f126e37 | 629 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
6c44e6b7 MN |
630 | } |
631 | ||
a47f0ce0 DM |
632 | mod_timer(&x->timer, jiffies + HZ); |
633 | if (x->replay_maxage) | |
634 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 635 | |
1da177e4 | 636 | wake_up(&km_waitq); |
f034b5d4 DM |
637 | |
638 | xfrm_state_num++; | |
639 | ||
640 | if (x->bydst.next != NULL && | |
641 | (xfrm_state_hmask + 1) < xfrm_state_hashmax && | |
642 | xfrm_state_num > xfrm_state_hmask) | |
643 | schedule_work(&xfrm_hash_work); | |
1da177e4 LT |
644 | } |
645 | ||
c7f5ea3a DM |
646 | /* xfrm_state_lock is held */ |
647 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
648 | { | |
649 | unsigned short family = xnew->props.family; | |
650 | u32 reqid = xnew->props.reqid; | |
651 | struct xfrm_state *x; | |
652 | struct hlist_node *entry; | |
653 | unsigned int h; | |
654 | ||
c1969f29 | 655 | h = xfrm_dst_hash(&xnew->id.daddr, &xnew->props.saddr, reqid, family); |
c7f5ea3a DM |
656 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
657 | if (x->props.family == family && | |
658 | x->props.reqid == reqid && | |
c1969f29 DM |
659 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
660 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
c7f5ea3a DM |
661 | x->genid = xfrm_state_genid; |
662 | } | |
663 | } | |
664 | ||
1da177e4 LT |
665 | void xfrm_state_insert(struct xfrm_state *x) |
666 | { | |
667 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 668 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
669 | __xfrm_state_insert(x); |
670 | spin_unlock_bh(&xfrm_state_lock); | |
671 | } | |
672 | EXPORT_SYMBOL(xfrm_state_insert); | |
673 | ||
2770834c DM |
674 | /* xfrm_state_lock is held */ |
675 | static struct xfrm_state *__find_acq_core(unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create) | |
676 | { | |
c1969f29 | 677 | unsigned int h = xfrm_dst_hash(daddr, saddr, reqid, family); |
8f126e37 | 678 | struct hlist_node *entry; |
2770834c DM |
679 | struct xfrm_state *x; |
680 | ||
8f126e37 | 681 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
2770834c DM |
682 | if (x->props.reqid != reqid || |
683 | x->props.mode != mode || | |
684 | x->props.family != family || | |
685 | x->km.state != XFRM_STATE_ACQ || | |
686 | x->id.spi != 0) | |
687 | continue; | |
688 | ||
689 | switch (family) { | |
690 | case AF_INET: | |
691 | if (x->id.daddr.a4 != daddr->a4 || | |
692 | x->props.saddr.a4 != saddr->a4) | |
693 | continue; | |
694 | break; | |
695 | case AF_INET6: | |
696 | if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6, | |
697 | (struct in6_addr *)daddr) || | |
698 | !ipv6_addr_equal((struct in6_addr *) | |
699 | x->props.saddr.a6, | |
700 | (struct in6_addr *)saddr)) | |
701 | continue; | |
702 | break; | |
703 | }; | |
704 | ||
705 | xfrm_state_hold(x); | |
706 | return x; | |
707 | } | |
708 | ||
709 | if (!create) | |
710 | return NULL; | |
711 | ||
712 | x = xfrm_state_alloc(); | |
713 | if (likely(x)) { | |
714 | switch (family) { | |
715 | case AF_INET: | |
716 | x->sel.daddr.a4 = daddr->a4; | |
717 | x->sel.saddr.a4 = saddr->a4; | |
718 | x->sel.prefixlen_d = 32; | |
719 | x->sel.prefixlen_s = 32; | |
720 | x->props.saddr.a4 = saddr->a4; | |
721 | x->id.daddr.a4 = daddr->a4; | |
722 | break; | |
723 | ||
724 | case AF_INET6: | |
725 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
726 | (struct in6_addr *)daddr); | |
727 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
728 | (struct in6_addr *)saddr); | |
729 | x->sel.prefixlen_d = 128; | |
730 | x->sel.prefixlen_s = 128; | |
731 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
732 | (struct in6_addr *)saddr); | |
733 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
734 | (struct in6_addr *)daddr); | |
735 | break; | |
736 | }; | |
737 | ||
738 | x->km.state = XFRM_STATE_ACQ; | |
739 | x->id.proto = proto; | |
740 | x->props.family = family; | |
741 | x->props.mode = mode; | |
742 | x->props.reqid = reqid; | |
743 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
744 | xfrm_state_hold(x); | |
745 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; | |
746 | add_timer(&x->timer); | |
8f126e37 | 747 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
2770834c | 748 | h = xfrm_src_hash(saddr, family); |
8f126e37 | 749 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
2770834c DM |
750 | wake_up(&km_waitq); |
751 | } | |
752 | ||
753 | return x; | |
754 | } | |
755 | ||
1da177e4 LT |
756 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq); |
757 | ||
758 | int xfrm_state_add(struct xfrm_state *x) | |
759 | { | |
1da177e4 LT |
760 | struct xfrm_state *x1; |
761 | int family; | |
762 | int err; | |
eb2971b6 | 763 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
764 | |
765 | family = x->props.family; | |
1da177e4 LT |
766 | |
767 | spin_lock_bh(&xfrm_state_lock); | |
768 | ||
edcd5821 | 769 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 LT |
770 | if (x1) { |
771 | xfrm_state_put(x1); | |
772 | x1 = NULL; | |
773 | err = -EEXIST; | |
774 | goto out; | |
775 | } | |
776 | ||
eb2971b6 | 777 | if (use_spi && x->km.seq) { |
1da177e4 LT |
778 | x1 = __xfrm_find_acq_byseq(x->km.seq); |
779 | if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) { | |
780 | xfrm_state_put(x1); | |
781 | x1 = NULL; | |
782 | } | |
783 | } | |
784 | ||
eb2971b6 | 785 | if (use_spi && !x1) |
2770834c DM |
786 | x1 = __find_acq_core(family, x->props.mode, x->props.reqid, |
787 | x->id.proto, | |
788 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 | 789 | |
c7f5ea3a | 790 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
791 | __xfrm_state_insert(x); |
792 | err = 0; | |
793 | ||
794 | out: | |
795 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
796 | |
797 | if (x1) { | |
798 | xfrm_state_delete(x1); | |
799 | xfrm_state_put(x1); | |
800 | } | |
801 | ||
802 | return err; | |
803 | } | |
804 | EXPORT_SYMBOL(xfrm_state_add); | |
805 | ||
806 | int xfrm_state_update(struct xfrm_state *x) | |
807 | { | |
1da177e4 LT |
808 | struct xfrm_state *x1; |
809 | int err; | |
eb2971b6 | 810 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 811 | |
1da177e4 | 812 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 813 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
814 | |
815 | err = -ESRCH; | |
816 | if (!x1) | |
817 | goto out; | |
818 | ||
819 | if (xfrm_state_kern(x1)) { | |
820 | xfrm_state_put(x1); | |
821 | err = -EEXIST; | |
822 | goto out; | |
823 | } | |
824 | ||
825 | if (x1->km.state == XFRM_STATE_ACQ) { | |
826 | __xfrm_state_insert(x); | |
827 | x = NULL; | |
828 | } | |
829 | err = 0; | |
830 | ||
831 | out: | |
832 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
833 | |
834 | if (err) | |
835 | return err; | |
836 | ||
837 | if (!x) { | |
838 | xfrm_state_delete(x1); | |
839 | xfrm_state_put(x1); | |
840 | return 0; | |
841 | } | |
842 | ||
843 | err = -EINVAL; | |
844 | spin_lock_bh(&x1->lock); | |
845 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
846 | if (x->encap && x1->encap) | |
847 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
848 | if (x->coaddr && x1->coaddr) { |
849 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
850 | } | |
851 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
852 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
853 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
854 | x1->km.dying = 0; | |
855 | ||
a47f0ce0 | 856 | mod_timer(&x1->timer, jiffies + HZ); |
1da177e4 LT |
857 | if (x1->curlft.use_time) |
858 | xfrm_state_check_expire(x1); | |
859 | ||
860 | err = 0; | |
861 | } | |
862 | spin_unlock_bh(&x1->lock); | |
863 | ||
864 | xfrm_state_put(x1); | |
865 | ||
866 | return err; | |
867 | } | |
868 | EXPORT_SYMBOL(xfrm_state_update); | |
869 | ||
870 | int xfrm_state_check_expire(struct xfrm_state *x) | |
871 | { | |
872 | if (!x->curlft.use_time) | |
873 | x->curlft.use_time = (unsigned long)xtime.tv_sec; | |
874 | ||
875 | if (x->km.state != XFRM_STATE_VALID) | |
876 | return -EINVAL; | |
877 | ||
878 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
879 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 880 | x->km.state = XFRM_STATE_EXPIRED; |
a47f0ce0 | 881 | mod_timer(&x->timer, jiffies); |
1da177e4 LT |
882 | return -EINVAL; |
883 | } | |
884 | ||
885 | if (!x->km.dying && | |
886 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
887 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
888 | x->km.dying = 1; | |
53bc6b4d | 889 | km_state_expired(x, 0, 0); |
4666faab | 890 | } |
1da177e4 LT |
891 | return 0; |
892 | } | |
893 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
894 | ||
895 | static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb) | |
896 | { | |
897 | int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev) | |
898 | - skb_headroom(skb); | |
899 | ||
900 | if (nhead > 0) | |
901 | return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); | |
902 | ||
903 | /* Check tail too... */ | |
904 | return 0; | |
905 | } | |
906 | ||
907 | int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb) | |
908 | { | |
909 | int err = xfrm_state_check_expire(x); | |
910 | if (err < 0) | |
911 | goto err; | |
912 | err = xfrm_state_check_space(x, skb); | |
913 | err: | |
914 | return err; | |
915 | } | |
916 | EXPORT_SYMBOL(xfrm_state_check); | |
917 | ||
918 | struct xfrm_state * | |
a94cfd19 | 919 | xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, |
1da177e4 LT |
920 | unsigned short family) |
921 | { | |
922 | struct xfrm_state *x; | |
1da177e4 LT |
923 | |
924 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 925 | x = __xfrm_state_lookup(daddr, spi, proto, family); |
1da177e4 | 926 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
927 | return x; |
928 | } | |
929 | EXPORT_SYMBOL(xfrm_state_lookup); | |
930 | ||
931 | struct xfrm_state * | |
eb2971b6 MN |
932 | xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, |
933 | u8 proto, unsigned short family) | |
934 | { | |
935 | struct xfrm_state *x; | |
eb2971b6 MN |
936 | |
937 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 938 | x = __xfrm_state_lookup_byaddr(daddr, saddr, proto, family); |
eb2971b6 | 939 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
940 | return x; |
941 | } | |
942 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
943 | ||
944 | struct xfrm_state * | |
1da177e4 LT |
945 | xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
946 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
947 | int create, unsigned short family) | |
948 | { | |
949 | struct xfrm_state *x; | |
1da177e4 LT |
950 | |
951 | spin_lock_bh(&xfrm_state_lock); | |
2770834c | 952 | x = __find_acq_core(family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 953 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 954 | |
1da177e4 LT |
955 | return x; |
956 | } | |
957 | EXPORT_SYMBOL(xfrm_find_acq); | |
958 | ||
41a49cc3 MN |
959 | #ifdef CONFIG_XFRM_SUB_POLICY |
960 | int | |
961 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
962 | unsigned short family) | |
963 | { | |
964 | int err = 0; | |
965 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
966 | if (!afinfo) | |
967 | return -EAFNOSUPPORT; | |
968 | ||
969 | spin_lock_bh(&xfrm_state_lock); | |
970 | if (afinfo->tmpl_sort) | |
971 | err = afinfo->tmpl_sort(dst, src, n); | |
972 | spin_unlock_bh(&xfrm_state_lock); | |
973 | xfrm_state_put_afinfo(afinfo); | |
974 | return err; | |
975 | } | |
976 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
977 | ||
978 | int | |
979 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
980 | unsigned short family) | |
981 | { | |
982 | int err = 0; | |
983 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
984 | if (!afinfo) | |
985 | return -EAFNOSUPPORT; | |
986 | ||
987 | spin_lock_bh(&xfrm_state_lock); | |
988 | if (afinfo->state_sort) | |
989 | err = afinfo->state_sort(dst, src, n); | |
990 | spin_unlock_bh(&xfrm_state_lock); | |
991 | xfrm_state_put_afinfo(afinfo); | |
992 | return err; | |
993 | } | |
994 | EXPORT_SYMBOL(xfrm_state_sort); | |
995 | #endif | |
996 | ||
1da177e4 LT |
997 | /* Silly enough, but I'm lazy to build resolution list */ |
998 | ||
999 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq) | |
1000 | { | |
1001 | int i; | |
1da177e4 | 1002 | |
f034b5d4 | 1003 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 DM |
1004 | struct hlist_node *entry; |
1005 | struct xfrm_state *x; | |
1006 | ||
1007 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { | |
1008 | if (x->km.seq == seq && | |
1009 | x->km.state == XFRM_STATE_ACQ) { | |
1da177e4 LT |
1010 | xfrm_state_hold(x); |
1011 | return x; | |
1012 | } | |
1013 | } | |
1014 | } | |
1015 | return NULL; | |
1016 | } | |
1017 | ||
1018 | struct xfrm_state *xfrm_find_acq_byseq(u32 seq) | |
1019 | { | |
1020 | struct xfrm_state *x; | |
1021 | ||
1022 | spin_lock_bh(&xfrm_state_lock); | |
1023 | x = __xfrm_find_acq_byseq(seq); | |
1024 | spin_unlock_bh(&xfrm_state_lock); | |
1025 | return x; | |
1026 | } | |
1027 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1028 | ||
1029 | u32 xfrm_get_acqseq(void) | |
1030 | { | |
1031 | u32 res; | |
1032 | static u32 acqseq; | |
1033 | static DEFINE_SPINLOCK(acqseq_lock); | |
1034 | ||
1035 | spin_lock_bh(&acqseq_lock); | |
1036 | res = (++acqseq ? : ++acqseq); | |
1037 | spin_unlock_bh(&acqseq_lock); | |
1038 | return res; | |
1039 | } | |
1040 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1041 | ||
1042 | void | |
26977b4e | 1043 | xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi) |
1da177e4 | 1044 | { |
f034b5d4 | 1045 | unsigned int h; |
1da177e4 LT |
1046 | struct xfrm_state *x0; |
1047 | ||
1048 | if (x->id.spi) | |
1049 | return; | |
1050 | ||
1051 | if (minspi == maxspi) { | |
1052 | x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family); | |
1053 | if (x0) { | |
1054 | xfrm_state_put(x0); | |
1055 | return; | |
1056 | } | |
1057 | x->id.spi = minspi; | |
1058 | } else { | |
1059 | u32 spi = 0; | |
26977b4e AV |
1060 | u32 low = ntohl(minspi); |
1061 | u32 high = ntohl(maxspi); | |
1062 | for (h=0; h<high-low+1; h++) { | |
1063 | spi = low + net_random()%(high-low+1); | |
1da177e4 LT |
1064 | x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1065 | if (x0 == NULL) { | |
1066 | x->id.spi = htonl(spi); | |
1067 | break; | |
1068 | } | |
1069 | xfrm_state_put(x0); | |
1070 | } | |
1071 | } | |
1072 | if (x->id.spi) { | |
1073 | spin_lock_bh(&xfrm_state_lock); | |
1074 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); | |
8f126e37 | 1075 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
1da177e4 LT |
1076 | spin_unlock_bh(&xfrm_state_lock); |
1077 | wake_up(&km_waitq); | |
1078 | } | |
1079 | } | |
1080 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1081 | ||
1082 | int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), | |
1083 | void *data) | |
1084 | { | |
1085 | int i; | |
1086 | struct xfrm_state *x; | |
8f126e37 | 1087 | struct hlist_node *entry; |
1da177e4 LT |
1088 | int count = 0; |
1089 | int err = 0; | |
1090 | ||
1091 | spin_lock_bh(&xfrm_state_lock); | |
f034b5d4 | 1092 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 | 1093 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
5794708f | 1094 | if (xfrm_id_proto_match(x->id.proto, proto)) |
1da177e4 LT |
1095 | count++; |
1096 | } | |
1097 | } | |
1098 | if (count == 0) { | |
1099 | err = -ENOENT; | |
1100 | goto out; | |
1101 | } | |
1102 | ||
f034b5d4 | 1103 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 | 1104 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
5794708f | 1105 | if (!xfrm_id_proto_match(x->id.proto, proto)) |
1da177e4 LT |
1106 | continue; |
1107 | err = func(x, --count, data); | |
1108 | if (err) | |
1109 | goto out; | |
1110 | } | |
1111 | } | |
1112 | out: | |
1113 | spin_unlock_bh(&xfrm_state_lock); | |
1114 | return err; | |
1115 | } | |
1116 | EXPORT_SYMBOL(xfrm_state_walk); | |
1117 | ||
f8cd5488 JHS |
1118 | |
1119 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1120 | { | |
1121 | struct km_event c; | |
1122 | /* we send notify messages in case | |
1123 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1124 | * is at least x->replay_maxdiff, in this case we also update the | |
1125 | * timeout of our timer function | |
1126 | * 2. if x->replay_maxage has elapsed since last update, | |
1127 | * and there were changes | |
1128 | * | |
1129 | * The state structure must be locked! | |
1130 | */ | |
1131 | ||
1132 | switch (event) { | |
1133 | case XFRM_REPLAY_UPDATE: | |
1134 | if (x->replay_maxdiff && | |
1135 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1136 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1137 | if (x->xflags & XFRM_TIME_DEFER) | |
1138 | event = XFRM_REPLAY_TIMEOUT; | |
1139 | else | |
1140 | return; | |
1141 | } | |
f8cd5488 JHS |
1142 | |
1143 | break; | |
1144 | ||
1145 | case XFRM_REPLAY_TIMEOUT: | |
1146 | if ((x->replay.seq == x->preplay.seq) && | |
1147 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1148 | (x->replay.oseq == x->preplay.oseq)) { |
1149 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1150 | return; |
2717096a | 1151 | } |
f8cd5488 JHS |
1152 | |
1153 | break; | |
1154 | } | |
1155 | ||
1156 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1157 | c.event = XFRM_MSG_NEWAE; | |
1158 | c.data.aevent = event; | |
1159 | km_state_notify(x, &c); | |
1160 | ||
f8cd5488 | 1161 | if (x->replay_maxage && |
a47f0ce0 | 1162 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1163 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 | 1164 | } |
a70fcb0b | 1165 | EXPORT_SYMBOL(xfrm_replay_notify); |
f8cd5488 JHS |
1166 | |
1167 | static void xfrm_replay_timer_handler(unsigned long data) | |
1168 | { | |
1169 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1170 | ||
1171 | spin_lock(&x->lock); | |
1172 | ||
2717096a JHS |
1173 | if (x->km.state == XFRM_STATE_VALID) { |
1174 | if (xfrm_aevent_is_on()) | |
1175 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); | |
1176 | else | |
1177 | x->xflags |= XFRM_TIME_DEFER; | |
1178 | } | |
f8cd5488 JHS |
1179 | |
1180 | spin_unlock(&x->lock); | |
1181 | } | |
1182 | ||
1da177e4 LT |
1183 | int xfrm_replay_check(struct xfrm_state *x, u32 seq) |
1184 | { | |
1185 | u32 diff; | |
1186 | ||
1187 | seq = ntohl(seq); | |
1188 | ||
1189 | if (unlikely(seq == 0)) | |
1190 | return -EINVAL; | |
1191 | ||
1192 | if (likely(seq > x->replay.seq)) | |
1193 | return 0; | |
1194 | ||
1195 | diff = x->replay.seq - seq; | |
1196 | if (diff >= x->props.replay_window) { | |
1197 | x->stats.replay_window++; | |
1198 | return -EINVAL; | |
1199 | } | |
1200 | ||
1201 | if (x->replay.bitmap & (1U << diff)) { | |
1202 | x->stats.replay++; | |
1203 | return -EINVAL; | |
1204 | } | |
1205 | return 0; | |
1206 | } | |
1207 | EXPORT_SYMBOL(xfrm_replay_check); | |
1208 | ||
1209 | void xfrm_replay_advance(struct xfrm_state *x, u32 seq) | |
1210 | { | |
1211 | u32 diff; | |
1212 | ||
1213 | seq = ntohl(seq); | |
1214 | ||
1215 | if (seq > x->replay.seq) { | |
1216 | diff = seq - x->replay.seq; | |
1217 | if (diff < x->props.replay_window) | |
1218 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1219 | else | |
1220 | x->replay.bitmap = 1; | |
1221 | x->replay.seq = seq; | |
1222 | } else { | |
1223 | diff = x->replay.seq - seq; | |
1224 | x->replay.bitmap |= (1U << diff); | |
1225 | } | |
f8cd5488 JHS |
1226 | |
1227 | if (xfrm_aevent_is_on()) | |
1228 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1da177e4 LT |
1229 | } |
1230 | EXPORT_SYMBOL(xfrm_replay_advance); | |
1231 | ||
1232 | static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list); | |
1233 | static DEFINE_RWLOCK(xfrm_km_lock); | |
1234 | ||
26b15dad | 1235 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1236 | { |
1237 | struct xfrm_mgr *km; | |
1238 | ||
26b15dad JHS |
1239 | read_lock(&xfrm_km_lock); |
1240 | list_for_each_entry(km, &xfrm_km_list, list) | |
1241 | if (km->notify_policy) | |
1242 | km->notify_policy(xp, dir, c); | |
1243 | read_unlock(&xfrm_km_lock); | |
1244 | } | |
1da177e4 | 1245 | |
26b15dad JHS |
1246 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1247 | { | |
1248 | struct xfrm_mgr *km; | |
1da177e4 LT |
1249 | read_lock(&xfrm_km_lock); |
1250 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1251 | if (km->notify) |
1252 | km->notify(x, c); | |
1da177e4 | 1253 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1254 | } |
1255 | ||
1256 | EXPORT_SYMBOL(km_policy_notify); | |
1257 | EXPORT_SYMBOL(km_state_notify); | |
1258 | ||
53bc6b4d | 1259 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad JHS |
1260 | { |
1261 | struct km_event c; | |
1262 | ||
bf08867f | 1263 | c.data.hard = hard; |
53bc6b4d | 1264 | c.pid = pid; |
f60f6b8f | 1265 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1266 | km_state_notify(x, &c); |
1da177e4 LT |
1267 | |
1268 | if (hard) | |
1269 | wake_up(&km_waitq); | |
1270 | } | |
1271 | ||
53bc6b4d | 1272 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1273 | /* |
1274 | * We send to all registered managers regardless of failure | |
1275 | * We are happy with one success | |
1276 | */ | |
980ebd25 | 1277 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1278 | { |
26b15dad | 1279 | int err = -EINVAL, acqret; |
1da177e4 LT |
1280 | struct xfrm_mgr *km; |
1281 | ||
1282 | read_lock(&xfrm_km_lock); | |
1283 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1284 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1285 | if (!acqret) | |
1286 | err = acqret; | |
1da177e4 LT |
1287 | } |
1288 | read_unlock(&xfrm_km_lock); | |
1289 | return err; | |
1290 | } | |
980ebd25 | 1291 | EXPORT_SYMBOL(km_query); |
1da177e4 LT |
1292 | |
1293 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport) | |
1294 | { | |
1295 | int err = -EINVAL; | |
1296 | struct xfrm_mgr *km; | |
1297 | ||
1298 | read_lock(&xfrm_km_lock); | |
1299 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1300 | if (km->new_mapping) | |
1301 | err = km->new_mapping(x, ipaddr, sport); | |
1302 | if (!err) | |
1303 | break; | |
1304 | } | |
1305 | read_unlock(&xfrm_km_lock); | |
1306 | return err; | |
1307 | } | |
1308 | EXPORT_SYMBOL(km_new_mapping); | |
1309 | ||
6c5c8ca7 | 1310 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1311 | { |
26b15dad | 1312 | struct km_event c; |
1da177e4 | 1313 | |
bf08867f | 1314 | c.data.hard = hard; |
6c5c8ca7 | 1315 | c.pid = pid; |
f60f6b8f | 1316 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1317 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1318 | |
1319 | if (hard) | |
1320 | wake_up(&km_waitq); | |
1321 | } | |
a70fcb0b | 1322 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1323 | |
97a64b45 MN |
1324 | int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
1325 | { | |
1326 | int err = -EINVAL; | |
1327 | int ret; | |
1328 | struct xfrm_mgr *km; | |
1329 | ||
1330 | read_lock(&xfrm_km_lock); | |
1331 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1332 | if (km->report) { | |
1333 | ret = km->report(proto, sel, addr); | |
1334 | if (!ret) | |
1335 | err = ret; | |
1336 | } | |
1337 | } | |
1338 | read_unlock(&xfrm_km_lock); | |
1339 | return err; | |
1340 | } | |
1341 | EXPORT_SYMBOL(km_report); | |
1342 | ||
1da177e4 LT |
1343 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1344 | { | |
1345 | int err; | |
1346 | u8 *data; | |
1347 | struct xfrm_mgr *km; | |
1348 | struct xfrm_policy *pol = NULL; | |
1349 | ||
1350 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1351 | return -EMSGSIZE; | |
1352 | ||
1353 | data = kmalloc(optlen, GFP_KERNEL); | |
1354 | if (!data) | |
1355 | return -ENOMEM; | |
1356 | ||
1357 | err = -EFAULT; | |
1358 | if (copy_from_user(data, optval, optlen)) | |
1359 | goto out; | |
1360 | ||
1361 | err = -EINVAL; | |
1362 | read_lock(&xfrm_km_lock); | |
1363 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1364 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1365 | optlen, &err); |
1366 | if (err >= 0) | |
1367 | break; | |
1368 | } | |
1369 | read_unlock(&xfrm_km_lock); | |
1370 | ||
1371 | if (err >= 0) { | |
1372 | xfrm_sk_policy_insert(sk, err, pol); | |
1373 | xfrm_pol_put(pol); | |
1374 | err = 0; | |
1375 | } | |
1376 | ||
1377 | out: | |
1378 | kfree(data); | |
1379 | return err; | |
1380 | } | |
1381 | EXPORT_SYMBOL(xfrm_user_policy); | |
1382 | ||
1383 | int xfrm_register_km(struct xfrm_mgr *km) | |
1384 | { | |
1385 | write_lock_bh(&xfrm_km_lock); | |
1386 | list_add_tail(&km->list, &xfrm_km_list); | |
1387 | write_unlock_bh(&xfrm_km_lock); | |
1388 | return 0; | |
1389 | } | |
1390 | EXPORT_SYMBOL(xfrm_register_km); | |
1391 | ||
1392 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1393 | { | |
1394 | write_lock_bh(&xfrm_km_lock); | |
1395 | list_del(&km->list); | |
1396 | write_unlock_bh(&xfrm_km_lock); | |
1397 | return 0; | |
1398 | } | |
1399 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1400 | ||
1401 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1402 | { | |
1403 | int err = 0; | |
1404 | if (unlikely(afinfo == NULL)) | |
1405 | return -EINVAL; | |
1406 | if (unlikely(afinfo->family >= NPROTO)) | |
1407 | return -EAFNOSUPPORT; | |
f3111502 | 1408 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1409 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1410 | err = -ENOBUFS; | |
edcd5821 | 1411 | else |
1da177e4 | 1412 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1413 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1414 | return err; |
1415 | } | |
1416 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1417 | ||
1418 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1419 | { | |
1420 | int err = 0; | |
1421 | if (unlikely(afinfo == NULL)) | |
1422 | return -EINVAL; | |
1423 | if (unlikely(afinfo->family >= NPROTO)) | |
1424 | return -EAFNOSUPPORT; | |
f3111502 | 1425 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1426 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1427 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1428 | err = -EINVAL; | |
edcd5821 | 1429 | else |
1da177e4 | 1430 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1431 | } |
f3111502 | 1432 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1433 | return err; |
1434 | } | |
1435 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1436 | ||
1437 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family) | |
1438 | { | |
1439 | struct xfrm_state_afinfo *afinfo; | |
1440 | if (unlikely(family >= NPROTO)) | |
1441 | return NULL; | |
1442 | read_lock(&xfrm_state_afinfo_lock); | |
1443 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1444 | if (unlikely(!afinfo)) |
1445 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1446 | return afinfo; |
1447 | } | |
1448 | ||
1449 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) | |
1450 | { | |
546be240 | 1451 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1452 | } |
1453 | ||
1454 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1455 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1456 | { | |
1457 | if (x->tunnel) { | |
1458 | struct xfrm_state *t = x->tunnel; | |
1459 | ||
1460 | if (atomic_read(&t->tunnel_users) == 2) | |
1461 | xfrm_state_delete(t); | |
1462 | atomic_dec(&t->tunnel_users); | |
1463 | xfrm_state_put(t); | |
1464 | x->tunnel = NULL; | |
1465 | } | |
1466 | } | |
1467 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1468 | ||
80b30c10 HX |
1469 | /* |
1470 | * This function is NOT optimal. For example, with ESP it will give an | |
1471 | * MTU that's usually two bytes short of being optimal. However, it will | |
1472 | * usually give an answer that's a multiple of 4 provided the input is | |
1473 | * also a multiple of 4. | |
1474 | */ | |
1da177e4 LT |
1475 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) |
1476 | { | |
1477 | int res = mtu; | |
1478 | ||
1479 | res -= x->props.header_len; | |
1480 | ||
1481 | for (;;) { | |
1482 | int m = res; | |
1483 | ||
1484 | if (m < 68) | |
1485 | return 68; | |
1486 | ||
1487 | spin_lock_bh(&x->lock); | |
1488 | if (x->km.state == XFRM_STATE_VALID && | |
1489 | x->type && x->type->get_max_size) | |
1490 | m = x->type->get_max_size(x, m); | |
1491 | else | |
1492 | m += x->props.header_len; | |
1493 | spin_unlock_bh(&x->lock); | |
1494 | ||
1495 | if (m <= mtu) | |
1496 | break; | |
1497 | res -= (m - mtu); | |
1498 | } | |
1499 | ||
1500 | return res; | |
1501 | } | |
1502 | ||
72cb6962 HX |
1503 | int xfrm_init_state(struct xfrm_state *x) |
1504 | { | |
d094cd83 HX |
1505 | struct xfrm_state_afinfo *afinfo; |
1506 | int family = x->props.family; | |
72cb6962 HX |
1507 | int err; |
1508 | ||
d094cd83 HX |
1509 | err = -EAFNOSUPPORT; |
1510 | afinfo = xfrm_state_get_afinfo(family); | |
1511 | if (!afinfo) | |
1512 | goto error; | |
1513 | ||
1514 | err = 0; | |
1515 | if (afinfo->init_flags) | |
1516 | err = afinfo->init_flags(x); | |
1517 | ||
1518 | xfrm_state_put_afinfo(afinfo); | |
1519 | ||
1520 | if (err) | |
1521 | goto error; | |
1522 | ||
1523 | err = -EPROTONOSUPPORT; | |
1524 | x->type = xfrm_get_type(x->id.proto, family); | |
72cb6962 HX |
1525 | if (x->type == NULL) |
1526 | goto error; | |
1527 | ||
1528 | err = x->type->init_state(x); | |
1529 | if (err) | |
1530 | goto error; | |
1531 | ||
b59f45d0 HX |
1532 | x->mode = xfrm_get_mode(x->props.mode, family); |
1533 | if (x->mode == NULL) | |
1534 | goto error; | |
1535 | ||
72cb6962 HX |
1536 | x->km.state = XFRM_STATE_VALID; |
1537 | ||
1538 | error: | |
1539 | return err; | |
1540 | } | |
1541 | ||
1542 | EXPORT_SYMBOL(xfrm_init_state); | |
1da177e4 LT |
1543 | |
1544 | void __init xfrm_state_init(void) | |
1545 | { | |
f034b5d4 DM |
1546 | unsigned int sz; |
1547 | ||
1548 | sz = sizeof(struct hlist_head) * 8; | |
1549 | ||
44e36b42 DM |
1550 | xfrm_state_bydst = xfrm_hash_alloc(sz); |
1551 | xfrm_state_bysrc = xfrm_hash_alloc(sz); | |
1552 | xfrm_state_byspi = xfrm_hash_alloc(sz); | |
f034b5d4 DM |
1553 | if (!xfrm_state_bydst || !xfrm_state_bysrc || !xfrm_state_byspi) |
1554 | panic("XFRM: Cannot allocate bydst/bysrc/byspi hashes."); | |
1555 | xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1); | |
1da177e4 | 1556 | |
1da177e4 LT |
1557 | INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task, NULL); |
1558 | } | |
1559 |