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Commit | Line | Data |
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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 | ||
667bbcb6 MN |
66 | static inline unsigned int xfrm_src_hash(xfrm_address_t *daddr, |
67 | xfrm_address_t *saddr, | |
44e36b42 | 68 | unsigned short family) |
f034b5d4 | 69 | { |
667bbcb6 | 70 | return __xfrm_src_hash(daddr, saddr, family, xfrm_state_hmask); |
f034b5d4 DM |
71 | } |
72 | ||
f034b5d4 | 73 | static inline unsigned int |
8122adf0 | 74 | xfrm_spi_hash(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
f034b5d4 | 75 | { |
c1969f29 | 76 | return __xfrm_spi_hash(daddr, spi, proto, family, xfrm_state_hmask); |
f034b5d4 DM |
77 | } |
78 | ||
f034b5d4 DM |
79 | static void xfrm_hash_transfer(struct hlist_head *list, |
80 | struct hlist_head *ndsttable, | |
81 | struct hlist_head *nsrctable, | |
82 | struct hlist_head *nspitable, | |
83 | unsigned int nhashmask) | |
84 | { | |
85 | struct hlist_node *entry, *tmp; | |
86 | struct xfrm_state *x; | |
87 | ||
88 | hlist_for_each_entry_safe(x, entry, tmp, list, bydst) { | |
89 | unsigned int h; | |
90 | ||
c1969f29 DM |
91 | h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
92 | x->props.reqid, x->props.family, | |
93 | nhashmask); | |
f034b5d4 DM |
94 | hlist_add_head(&x->bydst, ndsttable+h); |
95 | ||
667bbcb6 MN |
96 | h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr, |
97 | x->props.family, | |
f034b5d4 DM |
98 | nhashmask); |
99 | hlist_add_head(&x->bysrc, nsrctable+h); | |
100 | ||
7b4dc360 MN |
101 | if (x->id.spi) { |
102 | h = __xfrm_spi_hash(&x->id.daddr, x->id.spi, | |
103 | x->id.proto, x->props.family, | |
104 | nhashmask); | |
105 | hlist_add_head(&x->byspi, nspitable+h); | |
106 | } | |
f034b5d4 DM |
107 | } |
108 | } | |
109 | ||
110 | static unsigned long xfrm_hash_new_size(void) | |
111 | { | |
112 | return ((xfrm_state_hmask + 1) << 1) * | |
113 | sizeof(struct hlist_head); | |
114 | } | |
115 | ||
116 | static DEFINE_MUTEX(hash_resize_mutex); | |
117 | ||
c4028958 | 118 | static void xfrm_hash_resize(struct work_struct *__unused) |
f034b5d4 DM |
119 | { |
120 | struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi; | |
121 | unsigned long nsize, osize; | |
122 | unsigned int nhashmask, ohashmask; | |
123 | int i; | |
124 | ||
125 | mutex_lock(&hash_resize_mutex); | |
126 | ||
127 | nsize = xfrm_hash_new_size(); | |
44e36b42 | 128 | ndst = xfrm_hash_alloc(nsize); |
f034b5d4 DM |
129 | if (!ndst) |
130 | goto out_unlock; | |
44e36b42 | 131 | nsrc = xfrm_hash_alloc(nsize); |
f034b5d4 | 132 | if (!nsrc) { |
44e36b42 | 133 | xfrm_hash_free(ndst, nsize); |
f034b5d4 DM |
134 | goto out_unlock; |
135 | } | |
44e36b42 | 136 | nspi = xfrm_hash_alloc(nsize); |
f034b5d4 | 137 | if (!nspi) { |
44e36b42 DM |
138 | xfrm_hash_free(ndst, nsize); |
139 | xfrm_hash_free(nsrc, nsize); | |
f034b5d4 DM |
140 | goto out_unlock; |
141 | } | |
142 | ||
143 | spin_lock_bh(&xfrm_state_lock); | |
144 | ||
145 | nhashmask = (nsize / sizeof(struct hlist_head)) - 1U; | |
146 | for (i = xfrm_state_hmask; i >= 0; i--) | |
147 | xfrm_hash_transfer(xfrm_state_bydst+i, ndst, nsrc, nspi, | |
148 | nhashmask); | |
149 | ||
150 | odst = xfrm_state_bydst; | |
151 | osrc = xfrm_state_bysrc; | |
152 | ospi = xfrm_state_byspi; | |
153 | ohashmask = xfrm_state_hmask; | |
154 | ||
155 | xfrm_state_bydst = ndst; | |
156 | xfrm_state_bysrc = nsrc; | |
157 | xfrm_state_byspi = nspi; | |
158 | xfrm_state_hmask = nhashmask; | |
159 | ||
160 | spin_unlock_bh(&xfrm_state_lock); | |
161 | ||
162 | osize = (ohashmask + 1) * sizeof(struct hlist_head); | |
44e36b42 DM |
163 | xfrm_hash_free(odst, osize); |
164 | xfrm_hash_free(osrc, osize); | |
165 | xfrm_hash_free(ospi, osize); | |
f034b5d4 DM |
166 | |
167 | out_unlock: | |
168 | mutex_unlock(&hash_resize_mutex); | |
169 | } | |
170 | ||
c4028958 | 171 | static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize); |
f034b5d4 | 172 | |
1da177e4 LT |
173 | DECLARE_WAIT_QUEUE_HEAD(km_waitq); |
174 | EXPORT_SYMBOL(km_waitq); | |
175 | ||
176 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); | |
177 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
178 | ||
179 | static struct work_struct xfrm_state_gc_work; | |
8f126e37 | 180 | static HLIST_HEAD(xfrm_state_gc_list); |
1da177e4 LT |
181 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); |
182 | ||
53bc6b4d | 183 | int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 LT |
184 | |
185 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family); | |
186 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
187 | ||
980ebd25 | 188 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); |
53bc6b4d | 189 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid); |
1da177e4 LT |
190 | |
191 | static void xfrm_state_gc_destroy(struct xfrm_state *x) | |
192 | { | |
a47f0ce0 DM |
193 | del_timer_sync(&x->timer); |
194 | del_timer_sync(&x->rtimer); | |
a51482bd JJ |
195 | kfree(x->aalg); |
196 | kfree(x->ealg); | |
197 | kfree(x->calg); | |
198 | kfree(x->encap); | |
060f02a3 | 199 | kfree(x->coaddr); |
b59f45d0 HX |
200 | if (x->mode) |
201 | xfrm_put_mode(x->mode); | |
1da177e4 LT |
202 | if (x->type) { |
203 | x->type->destructor(x); | |
204 | xfrm_put_type(x->type); | |
205 | } | |
df71837d | 206 | security_xfrm_state_free(x); |
1da177e4 LT |
207 | kfree(x); |
208 | } | |
209 | ||
c4028958 | 210 | static void xfrm_state_gc_task(struct work_struct *data) |
1da177e4 LT |
211 | { |
212 | struct xfrm_state *x; | |
8f126e37 DM |
213 | struct hlist_node *entry, *tmp; |
214 | struct hlist_head gc_list; | |
1da177e4 | 215 | |
1da177e4 | 216 | spin_lock_bh(&xfrm_state_gc_lock); |
8f126e37 DM |
217 | gc_list.first = xfrm_state_gc_list.first; |
218 | INIT_HLIST_HEAD(&xfrm_state_gc_list); | |
1da177e4 LT |
219 | spin_unlock_bh(&xfrm_state_gc_lock); |
220 | ||
8f126e37 | 221 | hlist_for_each_entry_safe(x, entry, tmp, &gc_list, bydst) |
1da177e4 | 222 | xfrm_state_gc_destroy(x); |
8f126e37 | 223 | |
1da177e4 LT |
224 | wake_up(&km_waitq); |
225 | } | |
226 | ||
227 | static inline unsigned long make_jiffies(long secs) | |
228 | { | |
229 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
230 | return MAX_SCHEDULE_TIMEOUT-1; | |
231 | else | |
232 | return secs*HZ; | |
233 | } | |
234 | ||
235 | static void xfrm_timer_handler(unsigned long data) | |
236 | { | |
237 | struct xfrm_state *x = (struct xfrm_state*)data; | |
238 | unsigned long now = (unsigned long)xtime.tv_sec; | |
239 | long next = LONG_MAX; | |
240 | int warn = 0; | |
241 | ||
242 | spin_lock(&x->lock); | |
243 | if (x->km.state == XFRM_STATE_DEAD) | |
244 | goto out; | |
245 | if (x->km.state == XFRM_STATE_EXPIRED) | |
246 | goto expired; | |
247 | if (x->lft.hard_add_expires_seconds) { | |
248 | long tmo = x->lft.hard_add_expires_seconds + | |
249 | x->curlft.add_time - now; | |
250 | if (tmo <= 0) | |
251 | goto expired; | |
252 | if (tmo < next) | |
253 | next = tmo; | |
254 | } | |
255 | if (x->lft.hard_use_expires_seconds) { | |
256 | long tmo = x->lft.hard_use_expires_seconds + | |
257 | (x->curlft.use_time ? : now) - now; | |
258 | if (tmo <= 0) | |
259 | goto expired; | |
260 | if (tmo < next) | |
261 | next = tmo; | |
262 | } | |
263 | if (x->km.dying) | |
264 | goto resched; | |
265 | if (x->lft.soft_add_expires_seconds) { | |
266 | long tmo = x->lft.soft_add_expires_seconds + | |
267 | x->curlft.add_time - now; | |
268 | if (tmo <= 0) | |
269 | warn = 1; | |
270 | else if (tmo < next) | |
271 | next = tmo; | |
272 | } | |
273 | if (x->lft.soft_use_expires_seconds) { | |
274 | long tmo = x->lft.soft_use_expires_seconds + | |
275 | (x->curlft.use_time ? : now) - now; | |
276 | if (tmo <= 0) | |
277 | warn = 1; | |
278 | else if (tmo < next) | |
279 | next = tmo; | |
280 | } | |
281 | ||
4666faab | 282 | x->km.dying = warn; |
1da177e4 | 283 | if (warn) |
53bc6b4d | 284 | km_state_expired(x, 0, 0); |
1da177e4 | 285 | resched: |
a47f0ce0 DM |
286 | if (next != LONG_MAX) |
287 | mod_timer(&x->timer, jiffies + make_jiffies(next)); | |
288 | ||
1da177e4 LT |
289 | goto out; |
290 | ||
291 | expired: | |
292 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
293 | x->km.state = XFRM_STATE_EXPIRED; | |
294 | wake_up(&km_waitq); | |
295 | next = 2; | |
296 | goto resched; | |
297 | } | |
4666faab | 298 | if (!__xfrm_state_delete(x) && x->id.spi) |
53bc6b4d | 299 | km_state_expired(x, 1, 0); |
1da177e4 LT |
300 | |
301 | out: | |
302 | spin_unlock(&x->lock); | |
1da177e4 LT |
303 | } |
304 | ||
0ac84752 DM |
305 | static void xfrm_replay_timer_handler(unsigned long data); |
306 | ||
1da177e4 LT |
307 | struct xfrm_state *xfrm_state_alloc(void) |
308 | { | |
309 | struct xfrm_state *x; | |
310 | ||
0da974f4 | 311 | x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC); |
1da177e4 LT |
312 | |
313 | if (x) { | |
1da177e4 LT |
314 | atomic_set(&x->refcnt, 1); |
315 | atomic_set(&x->tunnel_users, 0); | |
8f126e37 DM |
316 | INIT_HLIST_NODE(&x->bydst); |
317 | INIT_HLIST_NODE(&x->bysrc); | |
318 | INIT_HLIST_NODE(&x->byspi); | |
1da177e4 LT |
319 | init_timer(&x->timer); |
320 | x->timer.function = xfrm_timer_handler; | |
321 | x->timer.data = (unsigned long)x; | |
f8cd5488 JHS |
322 | init_timer(&x->rtimer); |
323 | x->rtimer.function = xfrm_replay_timer_handler; | |
324 | x->rtimer.data = (unsigned long)x; | |
1da177e4 LT |
325 | x->curlft.add_time = (unsigned long)xtime.tv_sec; |
326 | x->lft.soft_byte_limit = XFRM_INF; | |
327 | x->lft.soft_packet_limit = XFRM_INF; | |
328 | x->lft.hard_byte_limit = XFRM_INF; | |
329 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
330 | x->replay_maxage = 0; |
331 | x->replay_maxdiff = 0; | |
1da177e4 LT |
332 | spin_lock_init(&x->lock); |
333 | } | |
334 | return x; | |
335 | } | |
336 | EXPORT_SYMBOL(xfrm_state_alloc); | |
337 | ||
338 | void __xfrm_state_destroy(struct xfrm_state *x) | |
339 | { | |
340 | BUG_TRAP(x->km.state == XFRM_STATE_DEAD); | |
341 | ||
342 | spin_lock_bh(&xfrm_state_gc_lock); | |
8f126e37 | 343 | hlist_add_head(&x->bydst, &xfrm_state_gc_list); |
1da177e4 LT |
344 | spin_unlock_bh(&xfrm_state_gc_lock); |
345 | schedule_work(&xfrm_state_gc_work); | |
346 | } | |
347 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
348 | ||
53bc6b4d | 349 | int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 350 | { |
26b15dad JHS |
351 | int err = -ESRCH; |
352 | ||
1da177e4 LT |
353 | if (x->km.state != XFRM_STATE_DEAD) { |
354 | x->km.state = XFRM_STATE_DEAD; | |
355 | spin_lock(&xfrm_state_lock); | |
8f126e37 | 356 | hlist_del(&x->bydst); |
8f126e37 | 357 | hlist_del(&x->bysrc); |
a47f0ce0 | 358 | if (x->id.spi) |
8f126e37 | 359 | hlist_del(&x->byspi); |
f034b5d4 | 360 | xfrm_state_num--; |
1da177e4 | 361 | spin_unlock(&xfrm_state_lock); |
1da177e4 | 362 | |
1da177e4 LT |
363 | /* All xfrm_state objects are created by xfrm_state_alloc. |
364 | * The xfrm_state_alloc call gives a reference, and that | |
365 | * is what we are dropping here. | |
366 | */ | |
21380b81 | 367 | __xfrm_state_put(x); |
26b15dad | 368 | err = 0; |
1da177e4 | 369 | } |
26b15dad JHS |
370 | |
371 | return err; | |
1da177e4 | 372 | } |
53bc6b4d | 373 | EXPORT_SYMBOL(__xfrm_state_delete); |
1da177e4 | 374 | |
26b15dad | 375 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 376 | { |
26b15dad JHS |
377 | int err; |
378 | ||
1da177e4 | 379 | spin_lock_bh(&x->lock); |
26b15dad | 380 | err = __xfrm_state_delete(x); |
1da177e4 | 381 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
382 | |
383 | return err; | |
1da177e4 LT |
384 | } |
385 | EXPORT_SYMBOL(xfrm_state_delete); | |
386 | ||
387 | void xfrm_state_flush(u8 proto) | |
388 | { | |
389 | int i; | |
1da177e4 LT |
390 | |
391 | spin_lock_bh(&xfrm_state_lock); | |
a9917c06 | 392 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 DM |
393 | struct hlist_node *entry; |
394 | struct xfrm_state *x; | |
1da177e4 | 395 | restart: |
8f126e37 | 396 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
1da177e4 | 397 | if (!xfrm_state_kern(x) && |
5794708f | 398 | xfrm_id_proto_match(x->id.proto, proto)) { |
1da177e4 LT |
399 | xfrm_state_hold(x); |
400 | spin_unlock_bh(&xfrm_state_lock); | |
401 | ||
402 | xfrm_state_delete(x); | |
403 | xfrm_state_put(x); | |
404 | ||
405 | spin_lock_bh(&xfrm_state_lock); | |
406 | goto restart; | |
407 | } | |
408 | } | |
409 | } | |
410 | spin_unlock_bh(&xfrm_state_lock); | |
411 | wake_up(&km_waitq); | |
412 | } | |
413 | EXPORT_SYMBOL(xfrm_state_flush); | |
414 | ||
415 | static int | |
416 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
417 | struct xfrm_tmpl *tmpl, | |
418 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
419 | unsigned short family) | |
420 | { | |
421 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
422 | if (!afinfo) | |
423 | return -1; | |
424 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
425 | xfrm_state_put_afinfo(afinfo); | |
426 | return 0; | |
427 | } | |
428 | ||
a94cfd19 | 429 | static struct xfrm_state *__xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family) |
edcd5821 DM |
430 | { |
431 | unsigned int h = xfrm_spi_hash(daddr, spi, proto, family); | |
432 | struct xfrm_state *x; | |
8f126e37 | 433 | struct hlist_node *entry; |
edcd5821 | 434 | |
8f126e37 | 435 | hlist_for_each_entry(x, entry, xfrm_state_byspi+h, byspi) { |
edcd5821 DM |
436 | if (x->props.family != family || |
437 | x->id.spi != spi || | |
438 | x->id.proto != proto) | |
439 | continue; | |
440 | ||
441 | switch (family) { | |
442 | case AF_INET: | |
443 | if (x->id.daddr.a4 != daddr->a4) | |
444 | continue; | |
445 | break; | |
446 | case AF_INET6: | |
447 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
448 | (struct in6_addr *) | |
449 | x->id.daddr.a6)) | |
450 | continue; | |
451 | break; | |
452 | }; | |
453 | ||
454 | xfrm_state_hold(x); | |
455 | return x; | |
456 | } | |
457 | ||
458 | return NULL; | |
459 | } | |
460 | ||
461 | static struct xfrm_state *__xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family) | |
462 | { | |
667bbcb6 | 463 | unsigned int h = xfrm_src_hash(daddr, saddr, family); |
edcd5821 | 464 | struct xfrm_state *x; |
8f126e37 | 465 | struct hlist_node *entry; |
edcd5821 | 466 | |
8f126e37 | 467 | hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) { |
edcd5821 DM |
468 | if (x->props.family != family || |
469 | x->id.proto != proto) | |
470 | continue; | |
471 | ||
472 | switch (family) { | |
473 | case AF_INET: | |
474 | if (x->id.daddr.a4 != daddr->a4 || | |
475 | x->props.saddr.a4 != saddr->a4) | |
476 | continue; | |
477 | break; | |
478 | case AF_INET6: | |
479 | if (!ipv6_addr_equal((struct in6_addr *)daddr, | |
480 | (struct in6_addr *) | |
481 | x->id.daddr.a6) || | |
482 | !ipv6_addr_equal((struct in6_addr *)saddr, | |
483 | (struct in6_addr *) | |
484 | x->props.saddr.a6)) | |
485 | continue; | |
486 | break; | |
487 | }; | |
488 | ||
489 | xfrm_state_hold(x); | |
490 | return x; | |
491 | } | |
492 | ||
493 | return NULL; | |
494 | } | |
495 | ||
496 | static inline struct xfrm_state * | |
497 | __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family) | |
498 | { | |
499 | if (use_spi) | |
500 | return __xfrm_state_lookup(&x->id.daddr, x->id.spi, | |
501 | x->id.proto, family); | |
502 | else | |
503 | return __xfrm_state_lookup_byaddr(&x->id.daddr, | |
504 | &x->props.saddr, | |
505 | x->id.proto, family); | |
506 | } | |
507 | ||
2fab22f2 PM |
508 | static void xfrm_hash_grow_check(int have_hash_collision) |
509 | { | |
510 | if (have_hash_collision && | |
511 | (xfrm_state_hmask + 1) < xfrm_state_hashmax && | |
512 | xfrm_state_num > xfrm_state_hmask) | |
513 | schedule_work(&xfrm_hash_work); | |
514 | } | |
515 | ||
1da177e4 LT |
516 | struct xfrm_state * |
517 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
518 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
519 | struct xfrm_policy *pol, int *err, | |
520 | unsigned short family) | |
521 | { | |
c1969f29 | 522 | unsigned int h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family); |
8f126e37 | 523 | struct hlist_node *entry; |
1da177e4 LT |
524 | struct xfrm_state *x, *x0; |
525 | int acquire_in_progress = 0; | |
526 | int error = 0; | |
527 | struct xfrm_state *best = NULL; | |
1da177e4 | 528 | |
1da177e4 | 529 | spin_lock_bh(&xfrm_state_lock); |
8f126e37 | 530 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
1da177e4 LT |
531 | if (x->props.family == family && |
532 | x->props.reqid == tmpl->reqid && | |
fbd9a5b4 | 533 | !(x->props.flags & XFRM_STATE_WILDRECV) && |
1da177e4 LT |
534 | xfrm_state_addr_check(x, daddr, saddr, family) && |
535 | tmpl->mode == x->props.mode && | |
536 | tmpl->id.proto == x->id.proto && | |
537 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { | |
538 | /* Resolution logic: | |
539 | 1. There is a valid state with matching selector. | |
540 | Done. | |
541 | 2. Valid state with inappropriate selector. Skip. | |
542 | ||
543 | Entering area of "sysdeps". | |
544 | ||
545 | 3. If state is not valid, selector is temporary, | |
546 | it selects only session which triggered | |
547 | previous resolution. Key manager will do | |
548 | something to install a state with proper | |
549 | selector. | |
550 | */ | |
551 | if (x->km.state == XFRM_STATE_VALID) { | |
df71837d | 552 | if (!xfrm_selector_match(&x->sel, fl, family) || |
e0d1caa7 | 553 | !security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
554 | continue; |
555 | if (!best || | |
556 | best->km.dying > x->km.dying || | |
557 | (best->km.dying == x->km.dying && | |
558 | best->curlft.add_time < x->curlft.add_time)) | |
559 | best = x; | |
560 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
561 | acquire_in_progress = 1; | |
562 | } else if (x->km.state == XFRM_STATE_ERROR || | |
563 | x->km.state == XFRM_STATE_EXPIRED) { | |
df71837d | 564 | if (xfrm_selector_match(&x->sel, fl, family) && |
e0d1caa7 | 565 | security_xfrm_state_pol_flow_match(x, pol, fl)) |
1da177e4 LT |
566 | error = -ESRCH; |
567 | } | |
568 | } | |
569 | } | |
570 | ||
571 | x = best; | |
572 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a | 573 | if (tmpl->id.spi && |
edcd5821 DM |
574 | (x0 = __xfrm_state_lookup(daddr, tmpl->id.spi, |
575 | tmpl->id.proto, family)) != NULL) { | |
1da177e4 LT |
576 | xfrm_state_put(x0); |
577 | error = -EEXIST; | |
578 | goto out; | |
579 | } | |
580 | x = xfrm_state_alloc(); | |
581 | if (x == NULL) { | |
582 | error = -ENOMEM; | |
583 | goto out; | |
584 | } | |
585 | /* Initialize temporary selector matching only | |
586 | * to current session. */ | |
587 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
588 | ||
e0d1caa7 VY |
589 | error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid); |
590 | if (error) { | |
591 | x->km.state = XFRM_STATE_DEAD; | |
592 | xfrm_state_put(x); | |
593 | x = NULL; | |
594 | goto out; | |
595 | } | |
596 | ||
1da177e4 LT |
597 | if (km_query(x, tmpl, pol) == 0) { |
598 | x->km.state = XFRM_STATE_ACQ; | |
8f126e37 | 599 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
667bbcb6 | 600 | h = xfrm_src_hash(daddr, saddr, family); |
8f126e37 | 601 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
1da177e4 LT |
602 | if (x->id.spi) { |
603 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family); | |
8f126e37 | 604 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
1da177e4 LT |
605 | } |
606 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
1da177e4 LT |
607 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; |
608 | add_timer(&x->timer); | |
2fab22f2 PM |
609 | xfrm_state_num++; |
610 | xfrm_hash_grow_check(x->bydst.next != NULL); | |
1da177e4 LT |
611 | } else { |
612 | x->km.state = XFRM_STATE_DEAD; | |
613 | xfrm_state_put(x); | |
614 | x = NULL; | |
615 | error = -ESRCH; | |
616 | } | |
617 | } | |
618 | out: | |
619 | if (x) | |
620 | xfrm_state_hold(x); | |
621 | else | |
622 | *err = acquire_in_progress ? -EAGAIN : error; | |
623 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
624 | return x; |
625 | } | |
626 | ||
627 | static void __xfrm_state_insert(struct xfrm_state *x) | |
628 | { | |
a624c108 | 629 | unsigned int h; |
1da177e4 | 630 | |
9d4a706d DM |
631 | x->genid = ++xfrm_state_genid; |
632 | ||
c1969f29 DM |
633 | h = xfrm_dst_hash(&x->id.daddr, &x->props.saddr, |
634 | x->props.reqid, x->props.family); | |
8f126e37 | 635 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
1da177e4 | 636 | |
667bbcb6 | 637 | h = xfrm_src_hash(&x->id.daddr, &x->props.saddr, x->props.family); |
8f126e37 | 638 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
1da177e4 | 639 | |
7b4dc360 | 640 | if (x->id.spi) { |
6c44e6b7 MN |
641 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, |
642 | x->props.family); | |
643 | ||
8f126e37 | 644 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
6c44e6b7 MN |
645 | } |
646 | ||
a47f0ce0 DM |
647 | mod_timer(&x->timer, jiffies + HZ); |
648 | if (x->replay_maxage) | |
649 | mod_timer(&x->rtimer, jiffies + x->replay_maxage); | |
f8cd5488 | 650 | |
1da177e4 | 651 | wake_up(&km_waitq); |
f034b5d4 DM |
652 | |
653 | xfrm_state_num++; | |
654 | ||
918049f0 | 655 | xfrm_hash_grow_check(x->bydst.next != NULL); |
1da177e4 LT |
656 | } |
657 | ||
c7f5ea3a DM |
658 | /* xfrm_state_lock is held */ |
659 | static void __xfrm_state_bump_genids(struct xfrm_state *xnew) | |
660 | { | |
661 | unsigned short family = xnew->props.family; | |
662 | u32 reqid = xnew->props.reqid; | |
663 | struct xfrm_state *x; | |
664 | struct hlist_node *entry; | |
665 | unsigned int h; | |
666 | ||
c1969f29 | 667 | h = xfrm_dst_hash(&xnew->id.daddr, &xnew->props.saddr, reqid, family); |
c7f5ea3a DM |
668 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
669 | if (x->props.family == family && | |
670 | x->props.reqid == reqid && | |
c1969f29 DM |
671 | !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) && |
672 | !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family)) | |
c7f5ea3a DM |
673 | x->genid = xfrm_state_genid; |
674 | } | |
675 | } | |
676 | ||
1da177e4 LT |
677 | void xfrm_state_insert(struct xfrm_state *x) |
678 | { | |
679 | spin_lock_bh(&xfrm_state_lock); | |
c7f5ea3a | 680 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
681 | __xfrm_state_insert(x); |
682 | spin_unlock_bh(&xfrm_state_lock); | |
683 | } | |
684 | EXPORT_SYMBOL(xfrm_state_insert); | |
685 | ||
2770834c DM |
686 | /* xfrm_state_lock is held */ |
687 | 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) | |
688 | { | |
c1969f29 | 689 | unsigned int h = xfrm_dst_hash(daddr, saddr, reqid, family); |
8f126e37 | 690 | struct hlist_node *entry; |
2770834c DM |
691 | struct xfrm_state *x; |
692 | ||
8f126e37 | 693 | hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) { |
2770834c DM |
694 | if (x->props.reqid != reqid || |
695 | x->props.mode != mode || | |
696 | x->props.family != family || | |
697 | x->km.state != XFRM_STATE_ACQ || | |
698 | x->id.spi != 0) | |
699 | continue; | |
700 | ||
701 | switch (family) { | |
702 | case AF_INET: | |
703 | if (x->id.daddr.a4 != daddr->a4 || | |
704 | x->props.saddr.a4 != saddr->a4) | |
705 | continue; | |
706 | break; | |
707 | case AF_INET6: | |
708 | if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6, | |
709 | (struct in6_addr *)daddr) || | |
710 | !ipv6_addr_equal((struct in6_addr *) | |
711 | x->props.saddr.a6, | |
712 | (struct in6_addr *)saddr)) | |
713 | continue; | |
714 | break; | |
715 | }; | |
716 | ||
717 | xfrm_state_hold(x); | |
718 | return x; | |
719 | } | |
720 | ||
721 | if (!create) | |
722 | return NULL; | |
723 | ||
724 | x = xfrm_state_alloc(); | |
725 | if (likely(x)) { | |
726 | switch (family) { | |
727 | case AF_INET: | |
728 | x->sel.daddr.a4 = daddr->a4; | |
729 | x->sel.saddr.a4 = saddr->a4; | |
730 | x->sel.prefixlen_d = 32; | |
731 | x->sel.prefixlen_s = 32; | |
732 | x->props.saddr.a4 = saddr->a4; | |
733 | x->id.daddr.a4 = daddr->a4; | |
734 | break; | |
735 | ||
736 | case AF_INET6: | |
737 | ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6, | |
738 | (struct in6_addr *)daddr); | |
739 | ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6, | |
740 | (struct in6_addr *)saddr); | |
741 | x->sel.prefixlen_d = 128; | |
742 | x->sel.prefixlen_s = 128; | |
743 | ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6, | |
744 | (struct in6_addr *)saddr); | |
745 | ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6, | |
746 | (struct in6_addr *)daddr); | |
747 | break; | |
748 | }; | |
749 | ||
750 | x->km.state = XFRM_STATE_ACQ; | |
751 | x->id.proto = proto; | |
752 | x->props.family = family; | |
753 | x->props.mode = mode; | |
754 | x->props.reqid = reqid; | |
755 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
756 | xfrm_state_hold(x); | |
757 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; | |
758 | add_timer(&x->timer); | |
8f126e37 | 759 | hlist_add_head(&x->bydst, xfrm_state_bydst+h); |
667bbcb6 | 760 | h = xfrm_src_hash(daddr, saddr, family); |
8f126e37 | 761 | hlist_add_head(&x->bysrc, xfrm_state_bysrc+h); |
2770834c | 762 | wake_up(&km_waitq); |
918049f0 DM |
763 | |
764 | xfrm_state_num++; | |
765 | ||
766 | xfrm_hash_grow_check(x->bydst.next != NULL); | |
2770834c DM |
767 | } |
768 | ||
769 | return x; | |
770 | } | |
771 | ||
1da177e4 LT |
772 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq); |
773 | ||
774 | int xfrm_state_add(struct xfrm_state *x) | |
775 | { | |
1da177e4 LT |
776 | struct xfrm_state *x1; |
777 | int family; | |
778 | int err; | |
eb2971b6 | 779 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 LT |
780 | |
781 | family = x->props.family; | |
1da177e4 LT |
782 | |
783 | spin_lock_bh(&xfrm_state_lock); | |
784 | ||
edcd5821 | 785 | x1 = __xfrm_state_locate(x, use_spi, family); |
1da177e4 LT |
786 | if (x1) { |
787 | xfrm_state_put(x1); | |
788 | x1 = NULL; | |
789 | err = -EEXIST; | |
790 | goto out; | |
791 | } | |
792 | ||
eb2971b6 | 793 | if (use_spi && x->km.seq) { |
1da177e4 LT |
794 | x1 = __xfrm_find_acq_byseq(x->km.seq); |
795 | if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) { | |
796 | xfrm_state_put(x1); | |
797 | x1 = NULL; | |
798 | } | |
799 | } | |
800 | ||
eb2971b6 | 801 | if (use_spi && !x1) |
2770834c DM |
802 | x1 = __find_acq_core(family, x->props.mode, x->props.reqid, |
803 | x->id.proto, | |
804 | &x->id.daddr, &x->props.saddr, 0); | |
1da177e4 | 805 | |
c7f5ea3a | 806 | __xfrm_state_bump_genids(x); |
1da177e4 LT |
807 | __xfrm_state_insert(x); |
808 | err = 0; | |
809 | ||
810 | out: | |
811 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
812 | |
813 | if (x1) { | |
814 | xfrm_state_delete(x1); | |
815 | xfrm_state_put(x1); | |
816 | } | |
817 | ||
818 | return err; | |
819 | } | |
820 | EXPORT_SYMBOL(xfrm_state_add); | |
821 | ||
822 | int xfrm_state_update(struct xfrm_state *x) | |
823 | { | |
1da177e4 LT |
824 | struct xfrm_state *x1; |
825 | int err; | |
eb2971b6 | 826 | int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY); |
1da177e4 | 827 | |
1da177e4 | 828 | spin_lock_bh(&xfrm_state_lock); |
edcd5821 | 829 | x1 = __xfrm_state_locate(x, use_spi, x->props.family); |
1da177e4 LT |
830 | |
831 | err = -ESRCH; | |
832 | if (!x1) | |
833 | goto out; | |
834 | ||
835 | if (xfrm_state_kern(x1)) { | |
836 | xfrm_state_put(x1); | |
837 | err = -EEXIST; | |
838 | goto out; | |
839 | } | |
840 | ||
841 | if (x1->km.state == XFRM_STATE_ACQ) { | |
842 | __xfrm_state_insert(x); | |
843 | x = NULL; | |
844 | } | |
845 | err = 0; | |
846 | ||
847 | out: | |
848 | spin_unlock_bh(&xfrm_state_lock); | |
1da177e4 LT |
849 | |
850 | if (err) | |
851 | return err; | |
852 | ||
853 | if (!x) { | |
854 | xfrm_state_delete(x1); | |
855 | xfrm_state_put(x1); | |
856 | return 0; | |
857 | } | |
858 | ||
859 | err = -EINVAL; | |
860 | spin_lock_bh(&x1->lock); | |
861 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
862 | if (x->encap && x1->encap) | |
863 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
060f02a3 NT |
864 | if (x->coaddr && x1->coaddr) { |
865 | memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr)); | |
866 | } | |
867 | if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel))) | |
868 | memcpy(&x1->sel, &x->sel, sizeof(x1->sel)); | |
1da177e4 LT |
869 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); |
870 | x1->km.dying = 0; | |
871 | ||
a47f0ce0 | 872 | mod_timer(&x1->timer, jiffies + HZ); |
1da177e4 LT |
873 | if (x1->curlft.use_time) |
874 | xfrm_state_check_expire(x1); | |
875 | ||
876 | err = 0; | |
877 | } | |
878 | spin_unlock_bh(&x1->lock); | |
879 | ||
880 | xfrm_state_put(x1); | |
881 | ||
882 | return err; | |
883 | } | |
884 | EXPORT_SYMBOL(xfrm_state_update); | |
885 | ||
886 | int xfrm_state_check_expire(struct xfrm_state *x) | |
887 | { | |
888 | if (!x->curlft.use_time) | |
889 | x->curlft.use_time = (unsigned long)xtime.tv_sec; | |
890 | ||
891 | if (x->km.state != XFRM_STATE_VALID) | |
892 | return -EINVAL; | |
893 | ||
894 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
895 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab | 896 | x->km.state = XFRM_STATE_EXPIRED; |
a47f0ce0 | 897 | mod_timer(&x->timer, jiffies); |
1da177e4 LT |
898 | return -EINVAL; |
899 | } | |
900 | ||
901 | if (!x->km.dying && | |
902 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
903 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
904 | x->km.dying = 1; | |
53bc6b4d | 905 | km_state_expired(x, 0, 0); |
4666faab | 906 | } |
1da177e4 LT |
907 | return 0; |
908 | } | |
909 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
910 | ||
911 | static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb) | |
912 | { | |
913 | int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev) | |
914 | - skb_headroom(skb); | |
915 | ||
916 | if (nhead > 0) | |
917 | return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); | |
918 | ||
919 | /* Check tail too... */ | |
920 | return 0; | |
921 | } | |
922 | ||
923 | int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb) | |
924 | { | |
925 | int err = xfrm_state_check_expire(x); | |
926 | if (err < 0) | |
927 | goto err; | |
928 | err = xfrm_state_check_space(x, skb); | |
929 | err: | |
930 | return err; | |
931 | } | |
932 | EXPORT_SYMBOL(xfrm_state_check); | |
933 | ||
934 | struct xfrm_state * | |
a94cfd19 | 935 | xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, |
1da177e4 LT |
936 | unsigned short family) |
937 | { | |
938 | struct xfrm_state *x; | |
1da177e4 LT |
939 | |
940 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 941 | x = __xfrm_state_lookup(daddr, spi, proto, family); |
1da177e4 | 942 | spin_unlock_bh(&xfrm_state_lock); |
1da177e4 LT |
943 | return x; |
944 | } | |
945 | EXPORT_SYMBOL(xfrm_state_lookup); | |
946 | ||
947 | struct xfrm_state * | |
eb2971b6 MN |
948 | xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, |
949 | u8 proto, unsigned short family) | |
950 | { | |
951 | struct xfrm_state *x; | |
eb2971b6 MN |
952 | |
953 | spin_lock_bh(&xfrm_state_lock); | |
edcd5821 | 954 | x = __xfrm_state_lookup_byaddr(daddr, saddr, proto, family); |
eb2971b6 | 955 | spin_unlock_bh(&xfrm_state_lock); |
eb2971b6 MN |
956 | return x; |
957 | } | |
958 | EXPORT_SYMBOL(xfrm_state_lookup_byaddr); | |
959 | ||
960 | struct xfrm_state * | |
1da177e4 LT |
961 | xfrm_find_acq(u8 mode, u32 reqid, u8 proto, |
962 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
963 | int create, unsigned short family) | |
964 | { | |
965 | struct xfrm_state *x; | |
1da177e4 LT |
966 | |
967 | spin_lock_bh(&xfrm_state_lock); | |
2770834c | 968 | x = __find_acq_core(family, mode, reqid, proto, daddr, saddr, create); |
1da177e4 | 969 | spin_unlock_bh(&xfrm_state_lock); |
2770834c | 970 | |
1da177e4 LT |
971 | return x; |
972 | } | |
973 | EXPORT_SYMBOL(xfrm_find_acq); | |
974 | ||
41a49cc3 MN |
975 | #ifdef CONFIG_XFRM_SUB_POLICY |
976 | int | |
977 | xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n, | |
978 | unsigned short family) | |
979 | { | |
980 | int err = 0; | |
981 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
982 | if (!afinfo) | |
983 | return -EAFNOSUPPORT; | |
984 | ||
985 | spin_lock_bh(&xfrm_state_lock); | |
986 | if (afinfo->tmpl_sort) | |
987 | err = afinfo->tmpl_sort(dst, src, n); | |
988 | spin_unlock_bh(&xfrm_state_lock); | |
989 | xfrm_state_put_afinfo(afinfo); | |
990 | return err; | |
991 | } | |
992 | EXPORT_SYMBOL(xfrm_tmpl_sort); | |
993 | ||
994 | int | |
995 | xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n, | |
996 | unsigned short family) | |
997 | { | |
998 | int err = 0; | |
999 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
1000 | if (!afinfo) | |
1001 | return -EAFNOSUPPORT; | |
1002 | ||
1003 | spin_lock_bh(&xfrm_state_lock); | |
1004 | if (afinfo->state_sort) | |
1005 | err = afinfo->state_sort(dst, src, n); | |
1006 | spin_unlock_bh(&xfrm_state_lock); | |
1007 | xfrm_state_put_afinfo(afinfo); | |
1008 | return err; | |
1009 | } | |
1010 | EXPORT_SYMBOL(xfrm_state_sort); | |
1011 | #endif | |
1012 | ||
1da177e4 LT |
1013 | /* Silly enough, but I'm lazy to build resolution list */ |
1014 | ||
1015 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq) | |
1016 | { | |
1017 | int i; | |
1da177e4 | 1018 | |
f034b5d4 | 1019 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 DM |
1020 | struct hlist_node *entry; |
1021 | struct xfrm_state *x; | |
1022 | ||
1023 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { | |
1024 | if (x->km.seq == seq && | |
1025 | x->km.state == XFRM_STATE_ACQ) { | |
1da177e4 LT |
1026 | xfrm_state_hold(x); |
1027 | return x; | |
1028 | } | |
1029 | } | |
1030 | } | |
1031 | return NULL; | |
1032 | } | |
1033 | ||
1034 | struct xfrm_state *xfrm_find_acq_byseq(u32 seq) | |
1035 | { | |
1036 | struct xfrm_state *x; | |
1037 | ||
1038 | spin_lock_bh(&xfrm_state_lock); | |
1039 | x = __xfrm_find_acq_byseq(seq); | |
1040 | spin_unlock_bh(&xfrm_state_lock); | |
1041 | return x; | |
1042 | } | |
1043 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
1044 | ||
1045 | u32 xfrm_get_acqseq(void) | |
1046 | { | |
1047 | u32 res; | |
1048 | static u32 acqseq; | |
1049 | static DEFINE_SPINLOCK(acqseq_lock); | |
1050 | ||
1051 | spin_lock_bh(&acqseq_lock); | |
1052 | res = (++acqseq ? : ++acqseq); | |
1053 | spin_unlock_bh(&acqseq_lock); | |
1054 | return res; | |
1055 | } | |
1056 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
1057 | ||
1058 | void | |
26977b4e | 1059 | xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi) |
1da177e4 | 1060 | { |
f034b5d4 | 1061 | unsigned int h; |
1da177e4 LT |
1062 | struct xfrm_state *x0; |
1063 | ||
1064 | if (x->id.spi) | |
1065 | return; | |
1066 | ||
1067 | if (minspi == maxspi) { | |
1068 | x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family); | |
1069 | if (x0) { | |
1070 | xfrm_state_put(x0); | |
1071 | return; | |
1072 | } | |
1073 | x->id.spi = minspi; | |
1074 | } else { | |
1075 | u32 spi = 0; | |
26977b4e AV |
1076 | u32 low = ntohl(minspi); |
1077 | u32 high = ntohl(maxspi); | |
1078 | for (h=0; h<high-low+1; h++) { | |
1079 | spi = low + net_random()%(high-low+1); | |
1da177e4 LT |
1080 | x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family); |
1081 | if (x0 == NULL) { | |
1082 | x->id.spi = htonl(spi); | |
1083 | break; | |
1084 | } | |
1085 | xfrm_state_put(x0); | |
1086 | } | |
1087 | } | |
1088 | if (x->id.spi) { | |
1089 | spin_lock_bh(&xfrm_state_lock); | |
1090 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); | |
8f126e37 | 1091 | hlist_add_head(&x->byspi, xfrm_state_byspi+h); |
1da177e4 LT |
1092 | spin_unlock_bh(&xfrm_state_lock); |
1093 | wake_up(&km_waitq); | |
1094 | } | |
1095 | } | |
1096 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
1097 | ||
1098 | int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), | |
1099 | void *data) | |
1100 | { | |
1101 | int i; | |
1102 | struct xfrm_state *x; | |
8f126e37 | 1103 | struct hlist_node *entry; |
1da177e4 LT |
1104 | int count = 0; |
1105 | int err = 0; | |
1106 | ||
1107 | spin_lock_bh(&xfrm_state_lock); | |
f034b5d4 | 1108 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 | 1109 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
5794708f | 1110 | if (xfrm_id_proto_match(x->id.proto, proto)) |
1da177e4 LT |
1111 | count++; |
1112 | } | |
1113 | } | |
1114 | if (count == 0) { | |
1115 | err = -ENOENT; | |
1116 | goto out; | |
1117 | } | |
1118 | ||
f034b5d4 | 1119 | for (i = 0; i <= xfrm_state_hmask; i++) { |
8f126e37 | 1120 | hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) { |
5794708f | 1121 | if (!xfrm_id_proto_match(x->id.proto, proto)) |
1da177e4 LT |
1122 | continue; |
1123 | err = func(x, --count, data); | |
1124 | if (err) | |
1125 | goto out; | |
1126 | } | |
1127 | } | |
1128 | out: | |
1129 | spin_unlock_bh(&xfrm_state_lock); | |
1130 | return err; | |
1131 | } | |
1132 | EXPORT_SYMBOL(xfrm_state_walk); | |
1133 | ||
f8cd5488 JHS |
1134 | |
1135 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
1136 | { | |
1137 | struct km_event c; | |
1138 | /* we send notify messages in case | |
1139 | * 1. we updated on of the sequence numbers, and the seqno difference | |
1140 | * is at least x->replay_maxdiff, in this case we also update the | |
1141 | * timeout of our timer function | |
1142 | * 2. if x->replay_maxage has elapsed since last update, | |
1143 | * and there were changes | |
1144 | * | |
1145 | * The state structure must be locked! | |
1146 | */ | |
1147 | ||
1148 | switch (event) { | |
1149 | case XFRM_REPLAY_UPDATE: | |
1150 | if (x->replay_maxdiff && | |
1151 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
2717096a JHS |
1152 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) { |
1153 | if (x->xflags & XFRM_TIME_DEFER) | |
1154 | event = XFRM_REPLAY_TIMEOUT; | |
1155 | else | |
1156 | return; | |
1157 | } | |
f8cd5488 JHS |
1158 | |
1159 | break; | |
1160 | ||
1161 | case XFRM_REPLAY_TIMEOUT: | |
1162 | if ((x->replay.seq == x->preplay.seq) && | |
1163 | (x->replay.bitmap == x->preplay.bitmap) && | |
2717096a JHS |
1164 | (x->replay.oseq == x->preplay.oseq)) { |
1165 | x->xflags |= XFRM_TIME_DEFER; | |
f8cd5488 | 1166 | return; |
2717096a | 1167 | } |
f8cd5488 JHS |
1168 | |
1169 | break; | |
1170 | } | |
1171 | ||
1172 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
1173 | c.event = XFRM_MSG_NEWAE; | |
1174 | c.data.aevent = event; | |
1175 | km_state_notify(x, &c); | |
1176 | ||
f8cd5488 | 1177 | if (x->replay_maxage && |
a47f0ce0 | 1178 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) |
2717096a | 1179 | x->xflags &= ~XFRM_TIME_DEFER; |
f8cd5488 | 1180 | } |
a70fcb0b | 1181 | EXPORT_SYMBOL(xfrm_replay_notify); |
f8cd5488 JHS |
1182 | |
1183 | static void xfrm_replay_timer_handler(unsigned long data) | |
1184 | { | |
1185 | struct xfrm_state *x = (struct xfrm_state*)data; | |
1186 | ||
1187 | spin_lock(&x->lock); | |
1188 | ||
2717096a JHS |
1189 | if (x->km.state == XFRM_STATE_VALID) { |
1190 | if (xfrm_aevent_is_on()) | |
1191 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); | |
1192 | else | |
1193 | x->xflags |= XFRM_TIME_DEFER; | |
1194 | } | |
f8cd5488 JHS |
1195 | |
1196 | spin_unlock(&x->lock); | |
1197 | } | |
1198 | ||
a252cc23 | 1199 | int xfrm_replay_check(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1200 | { |
1201 | u32 diff; | |
a252cc23 | 1202 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1203 | |
1204 | if (unlikely(seq == 0)) | |
1205 | return -EINVAL; | |
1206 | ||
1207 | if (likely(seq > x->replay.seq)) | |
1208 | return 0; | |
1209 | ||
1210 | diff = x->replay.seq - seq; | |
1211 | if (diff >= x->props.replay_window) { | |
1212 | x->stats.replay_window++; | |
1213 | return -EINVAL; | |
1214 | } | |
1215 | ||
1216 | if (x->replay.bitmap & (1U << diff)) { | |
1217 | x->stats.replay++; | |
1218 | return -EINVAL; | |
1219 | } | |
1220 | return 0; | |
1221 | } | |
1222 | EXPORT_SYMBOL(xfrm_replay_check); | |
1223 | ||
61f4627b | 1224 | void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq) |
1da177e4 LT |
1225 | { |
1226 | u32 diff; | |
61f4627b | 1227 | u32 seq = ntohl(net_seq); |
1da177e4 LT |
1228 | |
1229 | if (seq > x->replay.seq) { | |
1230 | diff = seq - x->replay.seq; | |
1231 | if (diff < x->props.replay_window) | |
1232 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
1233 | else | |
1234 | x->replay.bitmap = 1; | |
1235 | x->replay.seq = seq; | |
1236 | } else { | |
1237 | diff = x->replay.seq - seq; | |
1238 | x->replay.bitmap |= (1U << diff); | |
1239 | } | |
f8cd5488 JHS |
1240 | |
1241 | if (xfrm_aevent_is_on()) | |
1242 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1da177e4 LT |
1243 | } |
1244 | EXPORT_SYMBOL(xfrm_replay_advance); | |
1245 | ||
1246 | static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list); | |
1247 | static DEFINE_RWLOCK(xfrm_km_lock); | |
1248 | ||
26b15dad | 1249 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
1250 | { |
1251 | struct xfrm_mgr *km; | |
1252 | ||
26b15dad JHS |
1253 | read_lock(&xfrm_km_lock); |
1254 | list_for_each_entry(km, &xfrm_km_list, list) | |
1255 | if (km->notify_policy) | |
1256 | km->notify_policy(xp, dir, c); | |
1257 | read_unlock(&xfrm_km_lock); | |
1258 | } | |
1da177e4 | 1259 | |
26b15dad JHS |
1260 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
1261 | { | |
1262 | struct xfrm_mgr *km; | |
1da177e4 LT |
1263 | read_lock(&xfrm_km_lock); |
1264 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
1265 | if (km->notify) |
1266 | km->notify(x, c); | |
1da177e4 | 1267 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
1268 | } |
1269 | ||
1270 | EXPORT_SYMBOL(km_policy_notify); | |
1271 | EXPORT_SYMBOL(km_state_notify); | |
1272 | ||
53bc6b4d | 1273 | void km_state_expired(struct xfrm_state *x, int hard, u32 pid) |
26b15dad JHS |
1274 | { |
1275 | struct km_event c; | |
1276 | ||
bf08867f | 1277 | c.data.hard = hard; |
53bc6b4d | 1278 | c.pid = pid; |
f60f6b8f | 1279 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 1280 | km_state_notify(x, &c); |
1da177e4 LT |
1281 | |
1282 | if (hard) | |
1283 | wake_up(&km_waitq); | |
1284 | } | |
1285 | ||
53bc6b4d | 1286 | EXPORT_SYMBOL(km_state_expired); |
26b15dad JHS |
1287 | /* |
1288 | * We send to all registered managers regardless of failure | |
1289 | * We are happy with one success | |
1290 | */ | |
980ebd25 | 1291 | int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
1da177e4 | 1292 | { |
26b15dad | 1293 | int err = -EINVAL, acqret; |
1da177e4 LT |
1294 | struct xfrm_mgr *km; |
1295 | ||
1296 | read_lock(&xfrm_km_lock); | |
1297 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
1298 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
1299 | if (!acqret) | |
1300 | err = acqret; | |
1da177e4 LT |
1301 | } |
1302 | read_unlock(&xfrm_km_lock); | |
1303 | return err; | |
1304 | } | |
980ebd25 | 1305 | EXPORT_SYMBOL(km_query); |
1da177e4 LT |
1306 | |
1307 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport) | |
1308 | { | |
1309 | int err = -EINVAL; | |
1310 | struct xfrm_mgr *km; | |
1311 | ||
1312 | read_lock(&xfrm_km_lock); | |
1313 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1314 | if (km->new_mapping) | |
1315 | err = km->new_mapping(x, ipaddr, sport); | |
1316 | if (!err) | |
1317 | break; | |
1318 | } | |
1319 | read_unlock(&xfrm_km_lock); | |
1320 | return err; | |
1321 | } | |
1322 | EXPORT_SYMBOL(km_new_mapping); | |
1323 | ||
6c5c8ca7 | 1324 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) |
1da177e4 | 1325 | { |
26b15dad | 1326 | struct km_event c; |
1da177e4 | 1327 | |
bf08867f | 1328 | c.data.hard = hard; |
6c5c8ca7 | 1329 | c.pid = pid; |
f60f6b8f | 1330 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 1331 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
1332 | |
1333 | if (hard) | |
1334 | wake_up(&km_waitq); | |
1335 | } | |
a70fcb0b | 1336 | EXPORT_SYMBOL(km_policy_expired); |
1da177e4 | 1337 | |
97a64b45 MN |
1338 | int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr) |
1339 | { | |
1340 | int err = -EINVAL; | |
1341 | int ret; | |
1342 | struct xfrm_mgr *km; | |
1343 | ||
1344 | read_lock(&xfrm_km_lock); | |
1345 | list_for_each_entry(km, &xfrm_km_list, list) { | |
1346 | if (km->report) { | |
1347 | ret = km->report(proto, sel, addr); | |
1348 | if (!ret) | |
1349 | err = ret; | |
1350 | } | |
1351 | } | |
1352 | read_unlock(&xfrm_km_lock); | |
1353 | return err; | |
1354 | } | |
1355 | EXPORT_SYMBOL(km_report); | |
1356 | ||
1da177e4 LT |
1357 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) |
1358 | { | |
1359 | int err; | |
1360 | u8 *data; | |
1361 | struct xfrm_mgr *km; | |
1362 | struct xfrm_policy *pol = NULL; | |
1363 | ||
1364 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
1365 | return -EMSGSIZE; | |
1366 | ||
1367 | data = kmalloc(optlen, GFP_KERNEL); | |
1368 | if (!data) | |
1369 | return -ENOMEM; | |
1370 | ||
1371 | err = -EFAULT; | |
1372 | if (copy_from_user(data, optval, optlen)) | |
1373 | goto out; | |
1374 | ||
1375 | err = -EINVAL; | |
1376 | read_lock(&xfrm_km_lock); | |
1377 | list_for_each_entry(km, &xfrm_km_list, list) { | |
cb969f07 | 1378 | pol = km->compile_policy(sk, optname, data, |
1da177e4 LT |
1379 | optlen, &err); |
1380 | if (err >= 0) | |
1381 | break; | |
1382 | } | |
1383 | read_unlock(&xfrm_km_lock); | |
1384 | ||
1385 | if (err >= 0) { | |
1386 | xfrm_sk_policy_insert(sk, err, pol); | |
1387 | xfrm_pol_put(pol); | |
1388 | err = 0; | |
1389 | } | |
1390 | ||
1391 | out: | |
1392 | kfree(data); | |
1393 | return err; | |
1394 | } | |
1395 | EXPORT_SYMBOL(xfrm_user_policy); | |
1396 | ||
1397 | int xfrm_register_km(struct xfrm_mgr *km) | |
1398 | { | |
1399 | write_lock_bh(&xfrm_km_lock); | |
1400 | list_add_tail(&km->list, &xfrm_km_list); | |
1401 | write_unlock_bh(&xfrm_km_lock); | |
1402 | return 0; | |
1403 | } | |
1404 | EXPORT_SYMBOL(xfrm_register_km); | |
1405 | ||
1406 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1407 | { | |
1408 | write_lock_bh(&xfrm_km_lock); | |
1409 | list_del(&km->list); | |
1410 | write_unlock_bh(&xfrm_km_lock); | |
1411 | return 0; | |
1412 | } | |
1413 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1414 | ||
1415 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1416 | { | |
1417 | int err = 0; | |
1418 | if (unlikely(afinfo == NULL)) | |
1419 | return -EINVAL; | |
1420 | if (unlikely(afinfo->family >= NPROTO)) | |
1421 | return -EAFNOSUPPORT; | |
f3111502 | 1422 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1423 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) |
1424 | err = -ENOBUFS; | |
edcd5821 | 1425 | else |
1da177e4 | 1426 | xfrm_state_afinfo[afinfo->family] = afinfo; |
f3111502 | 1427 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1428 | return err; |
1429 | } | |
1430 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1431 | ||
1432 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1433 | { | |
1434 | int err = 0; | |
1435 | if (unlikely(afinfo == NULL)) | |
1436 | return -EINVAL; | |
1437 | if (unlikely(afinfo->family >= NPROTO)) | |
1438 | return -EAFNOSUPPORT; | |
f3111502 | 1439 | write_lock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1440 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { |
1441 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1442 | err = -EINVAL; | |
edcd5821 | 1443 | else |
1da177e4 | 1444 | xfrm_state_afinfo[afinfo->family] = NULL; |
1da177e4 | 1445 | } |
f3111502 | 1446 | write_unlock_bh(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1447 | return err; |
1448 | } | |
1449 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1450 | ||
1451 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family) | |
1452 | { | |
1453 | struct xfrm_state_afinfo *afinfo; | |
1454 | if (unlikely(family >= NPROTO)) | |
1455 | return NULL; | |
1456 | read_lock(&xfrm_state_afinfo_lock); | |
1457 | afinfo = xfrm_state_afinfo[family]; | |
546be240 HX |
1458 | if (unlikely(!afinfo)) |
1459 | read_unlock(&xfrm_state_afinfo_lock); | |
1da177e4 LT |
1460 | return afinfo; |
1461 | } | |
1462 | ||
1463 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) | |
1464 | { | |
546be240 | 1465 | read_unlock(&xfrm_state_afinfo_lock); |
1da177e4 LT |
1466 | } |
1467 | ||
1468 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1469 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1470 | { | |
1471 | if (x->tunnel) { | |
1472 | struct xfrm_state *t = x->tunnel; | |
1473 | ||
1474 | if (atomic_read(&t->tunnel_users) == 2) | |
1475 | xfrm_state_delete(t); | |
1476 | atomic_dec(&t->tunnel_users); | |
1477 | xfrm_state_put(t); | |
1478 | x->tunnel = NULL; | |
1479 | } | |
1480 | } | |
1481 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1482 | ||
80b30c10 HX |
1483 | /* |
1484 | * This function is NOT optimal. For example, with ESP it will give an | |
1485 | * MTU that's usually two bytes short of being optimal. However, it will | |
1486 | * usually give an answer that's a multiple of 4 provided the input is | |
1487 | * also a multiple of 4. | |
1488 | */ | |
1da177e4 LT |
1489 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) |
1490 | { | |
1491 | int res = mtu; | |
1492 | ||
1493 | res -= x->props.header_len; | |
1494 | ||
1495 | for (;;) { | |
1496 | int m = res; | |
1497 | ||
1498 | if (m < 68) | |
1499 | return 68; | |
1500 | ||
1501 | spin_lock_bh(&x->lock); | |
1502 | if (x->km.state == XFRM_STATE_VALID && | |
1503 | x->type && x->type->get_max_size) | |
1504 | m = x->type->get_max_size(x, m); | |
1505 | else | |
1506 | m += x->props.header_len; | |
1507 | spin_unlock_bh(&x->lock); | |
1508 | ||
1509 | if (m <= mtu) | |
1510 | break; | |
1511 | res -= (m - mtu); | |
1512 | } | |
1513 | ||
1514 | return res; | |
1515 | } | |
1516 | ||
72cb6962 HX |
1517 | int xfrm_init_state(struct xfrm_state *x) |
1518 | { | |
d094cd83 HX |
1519 | struct xfrm_state_afinfo *afinfo; |
1520 | int family = x->props.family; | |
72cb6962 HX |
1521 | int err; |
1522 | ||
d094cd83 HX |
1523 | err = -EAFNOSUPPORT; |
1524 | afinfo = xfrm_state_get_afinfo(family); | |
1525 | if (!afinfo) | |
1526 | goto error; | |
1527 | ||
1528 | err = 0; | |
1529 | if (afinfo->init_flags) | |
1530 | err = afinfo->init_flags(x); | |
1531 | ||
1532 | xfrm_state_put_afinfo(afinfo); | |
1533 | ||
1534 | if (err) | |
1535 | goto error; | |
1536 | ||
1537 | err = -EPROTONOSUPPORT; | |
1538 | x->type = xfrm_get_type(x->id.proto, family); | |
72cb6962 HX |
1539 | if (x->type == NULL) |
1540 | goto error; | |
1541 | ||
1542 | err = x->type->init_state(x); | |
1543 | if (err) | |
1544 | goto error; | |
1545 | ||
b59f45d0 HX |
1546 | x->mode = xfrm_get_mode(x->props.mode, family); |
1547 | if (x->mode == NULL) | |
1548 | goto error; | |
1549 | ||
72cb6962 HX |
1550 | x->km.state = XFRM_STATE_VALID; |
1551 | ||
1552 | error: | |
1553 | return err; | |
1554 | } | |
1555 | ||
1556 | EXPORT_SYMBOL(xfrm_init_state); | |
1da177e4 LT |
1557 | |
1558 | void __init xfrm_state_init(void) | |
1559 | { | |
f034b5d4 DM |
1560 | unsigned int sz; |
1561 | ||
1562 | sz = sizeof(struct hlist_head) * 8; | |
1563 | ||
44e36b42 DM |
1564 | xfrm_state_bydst = xfrm_hash_alloc(sz); |
1565 | xfrm_state_bysrc = xfrm_hash_alloc(sz); | |
1566 | xfrm_state_byspi = xfrm_hash_alloc(sz); | |
f034b5d4 DM |
1567 | if (!xfrm_state_bydst || !xfrm_state_bysrc || !xfrm_state_byspi) |
1568 | panic("XFRM: Cannot allocate bydst/bysrc/byspi hashes."); | |
1569 | xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1); | |
1da177e4 | 1570 | |
c4028958 | 1571 | INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task); |
1da177e4 LT |
1572 | } |
1573 |