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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> | |
21 | #include <asm/uaccess.h> | |
22 | ||
f8cd5488 JHS |
23 | u32 sysctl_xfrm_aevent_etime = XFRM_AE_ETIME; |
24 | u32 sysctl_xfrm_aevent_rseqth = XFRM_AE_SEQT_SIZE; | |
1da177e4 LT |
25 | /* Each xfrm_state may be linked to two tables: |
26 | ||
27 | 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl) | |
28 | 2. Hash table by daddr to find what SAs exist for given | |
29 | destination/tunnel endpoint. (output) | |
30 | */ | |
31 | ||
32 | static DEFINE_SPINLOCK(xfrm_state_lock); | |
33 | ||
34 | /* Hash table to find appropriate SA towards given target (endpoint | |
35 | * of tunnel or destination of transport mode) allowed by selector. | |
36 | * | |
37 | * Main use is finding SA after policy selected tunnel or transport mode. | |
38 | * Also, it can be used by ah/esp icmp error handler to find offending SA. | |
39 | */ | |
40 | static struct list_head xfrm_state_bydst[XFRM_DST_HSIZE]; | |
41 | static struct list_head xfrm_state_byspi[XFRM_DST_HSIZE]; | |
42 | ||
43 | DECLARE_WAIT_QUEUE_HEAD(km_waitq); | |
44 | EXPORT_SYMBOL(km_waitq); | |
45 | ||
46 | static DEFINE_RWLOCK(xfrm_state_afinfo_lock); | |
47 | static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO]; | |
48 | ||
49 | static struct work_struct xfrm_state_gc_work; | |
50 | static struct list_head xfrm_state_gc_list = LIST_HEAD_INIT(xfrm_state_gc_list); | |
51 | static DEFINE_SPINLOCK(xfrm_state_gc_lock); | |
52 | ||
53 | static int xfrm_state_gc_flush_bundles; | |
54 | ||
26b15dad | 55 | static int __xfrm_state_delete(struct xfrm_state *x); |
1da177e4 LT |
56 | |
57 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family); | |
58 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); | |
59 | ||
60 | static int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol); | |
61 | static void km_state_expired(struct xfrm_state *x, int hard); | |
62 | ||
63 | static void xfrm_state_gc_destroy(struct xfrm_state *x) | |
64 | { | |
65 | if (del_timer(&x->timer)) | |
66 | BUG(); | |
f8cd5488 JHS |
67 | if (del_timer(&x->rtimer)) |
68 | BUG(); | |
a51482bd JJ |
69 | kfree(x->aalg); |
70 | kfree(x->ealg); | |
71 | kfree(x->calg); | |
72 | kfree(x->encap); | |
1da177e4 LT |
73 | if (x->type) { |
74 | x->type->destructor(x); | |
75 | xfrm_put_type(x->type); | |
76 | } | |
df71837d | 77 | security_xfrm_state_free(x); |
1da177e4 LT |
78 | kfree(x); |
79 | } | |
80 | ||
81 | static void xfrm_state_gc_task(void *data) | |
82 | { | |
83 | struct xfrm_state *x; | |
84 | struct list_head *entry, *tmp; | |
85 | struct list_head gc_list = LIST_HEAD_INIT(gc_list); | |
86 | ||
87 | if (xfrm_state_gc_flush_bundles) { | |
88 | xfrm_state_gc_flush_bundles = 0; | |
89 | xfrm_flush_bundles(); | |
90 | } | |
91 | ||
92 | spin_lock_bh(&xfrm_state_gc_lock); | |
93 | list_splice_init(&xfrm_state_gc_list, &gc_list); | |
94 | spin_unlock_bh(&xfrm_state_gc_lock); | |
95 | ||
96 | list_for_each_safe(entry, tmp, &gc_list) { | |
97 | x = list_entry(entry, struct xfrm_state, bydst); | |
98 | xfrm_state_gc_destroy(x); | |
99 | } | |
100 | wake_up(&km_waitq); | |
101 | } | |
102 | ||
103 | static inline unsigned long make_jiffies(long secs) | |
104 | { | |
105 | if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ) | |
106 | return MAX_SCHEDULE_TIMEOUT-1; | |
107 | else | |
108 | return secs*HZ; | |
109 | } | |
110 | ||
111 | static void xfrm_timer_handler(unsigned long data) | |
112 | { | |
113 | struct xfrm_state *x = (struct xfrm_state*)data; | |
114 | unsigned long now = (unsigned long)xtime.tv_sec; | |
115 | long next = LONG_MAX; | |
116 | int warn = 0; | |
117 | ||
118 | spin_lock(&x->lock); | |
119 | if (x->km.state == XFRM_STATE_DEAD) | |
120 | goto out; | |
121 | if (x->km.state == XFRM_STATE_EXPIRED) | |
122 | goto expired; | |
123 | if (x->lft.hard_add_expires_seconds) { | |
124 | long tmo = x->lft.hard_add_expires_seconds + | |
125 | x->curlft.add_time - now; | |
126 | if (tmo <= 0) | |
127 | goto expired; | |
128 | if (tmo < next) | |
129 | next = tmo; | |
130 | } | |
131 | if (x->lft.hard_use_expires_seconds) { | |
132 | long tmo = x->lft.hard_use_expires_seconds + | |
133 | (x->curlft.use_time ? : now) - now; | |
134 | if (tmo <= 0) | |
135 | goto expired; | |
136 | if (tmo < next) | |
137 | next = tmo; | |
138 | } | |
139 | if (x->km.dying) | |
140 | goto resched; | |
141 | if (x->lft.soft_add_expires_seconds) { | |
142 | long tmo = x->lft.soft_add_expires_seconds + | |
143 | x->curlft.add_time - now; | |
144 | if (tmo <= 0) | |
145 | warn = 1; | |
146 | else if (tmo < next) | |
147 | next = tmo; | |
148 | } | |
149 | if (x->lft.soft_use_expires_seconds) { | |
150 | long tmo = x->lft.soft_use_expires_seconds + | |
151 | (x->curlft.use_time ? : now) - now; | |
152 | if (tmo <= 0) | |
153 | warn = 1; | |
154 | else if (tmo < next) | |
155 | next = tmo; | |
156 | } | |
157 | ||
4666faab | 158 | x->km.dying = warn; |
1da177e4 LT |
159 | if (warn) |
160 | km_state_expired(x, 0); | |
161 | resched: | |
162 | if (next != LONG_MAX && | |
163 | !mod_timer(&x->timer, jiffies + make_jiffies(next))) | |
164 | xfrm_state_hold(x); | |
165 | goto out; | |
166 | ||
167 | expired: | |
168 | if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) { | |
169 | x->km.state = XFRM_STATE_EXPIRED; | |
170 | wake_up(&km_waitq); | |
171 | next = 2; | |
172 | goto resched; | |
173 | } | |
4666faab | 174 | if (!__xfrm_state_delete(x) && x->id.spi) |
1da177e4 | 175 | km_state_expired(x, 1); |
1da177e4 LT |
176 | |
177 | out: | |
178 | spin_unlock(&x->lock); | |
179 | xfrm_state_put(x); | |
180 | } | |
181 | ||
182 | struct xfrm_state *xfrm_state_alloc(void) | |
183 | { | |
184 | struct xfrm_state *x; | |
185 | ||
186 | x = kmalloc(sizeof(struct xfrm_state), GFP_ATOMIC); | |
187 | ||
188 | if (x) { | |
189 | memset(x, 0, sizeof(struct xfrm_state)); | |
190 | atomic_set(&x->refcnt, 1); | |
191 | atomic_set(&x->tunnel_users, 0); | |
192 | INIT_LIST_HEAD(&x->bydst); | |
193 | INIT_LIST_HEAD(&x->byspi); | |
194 | init_timer(&x->timer); | |
195 | x->timer.function = xfrm_timer_handler; | |
196 | x->timer.data = (unsigned long)x; | |
f8cd5488 JHS |
197 | init_timer(&x->rtimer); |
198 | x->rtimer.function = xfrm_replay_timer_handler; | |
199 | x->rtimer.data = (unsigned long)x; | |
1da177e4 LT |
200 | x->curlft.add_time = (unsigned long)xtime.tv_sec; |
201 | x->lft.soft_byte_limit = XFRM_INF; | |
202 | x->lft.soft_packet_limit = XFRM_INF; | |
203 | x->lft.hard_byte_limit = XFRM_INF; | |
204 | x->lft.hard_packet_limit = XFRM_INF; | |
f8cd5488 JHS |
205 | x->replay_maxage = 0; |
206 | x->replay_maxdiff = 0; | |
1da177e4 LT |
207 | spin_lock_init(&x->lock); |
208 | } | |
209 | return x; | |
210 | } | |
211 | EXPORT_SYMBOL(xfrm_state_alloc); | |
212 | ||
213 | void __xfrm_state_destroy(struct xfrm_state *x) | |
214 | { | |
215 | BUG_TRAP(x->km.state == XFRM_STATE_DEAD); | |
216 | ||
217 | spin_lock_bh(&xfrm_state_gc_lock); | |
218 | list_add(&x->bydst, &xfrm_state_gc_list); | |
219 | spin_unlock_bh(&xfrm_state_gc_lock); | |
220 | schedule_work(&xfrm_state_gc_work); | |
221 | } | |
222 | EXPORT_SYMBOL(__xfrm_state_destroy); | |
223 | ||
26b15dad | 224 | static int __xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 225 | { |
26b15dad JHS |
226 | int err = -ESRCH; |
227 | ||
1da177e4 LT |
228 | if (x->km.state != XFRM_STATE_DEAD) { |
229 | x->km.state = XFRM_STATE_DEAD; | |
230 | spin_lock(&xfrm_state_lock); | |
231 | list_del(&x->bydst); | |
21380b81 | 232 | __xfrm_state_put(x); |
1da177e4 LT |
233 | if (x->id.spi) { |
234 | list_del(&x->byspi); | |
21380b81 | 235 | __xfrm_state_put(x); |
1da177e4 LT |
236 | } |
237 | spin_unlock(&xfrm_state_lock); | |
238 | if (del_timer(&x->timer)) | |
21380b81 | 239 | __xfrm_state_put(x); |
f8cd5488 JHS |
240 | if (del_timer(&x->rtimer)) |
241 | __xfrm_state_put(x); | |
1da177e4 LT |
242 | |
243 | /* The number two in this test is the reference | |
244 | * mentioned in the comment below plus the reference | |
245 | * our caller holds. A larger value means that | |
246 | * there are DSTs attached to this xfrm_state. | |
247 | */ | |
248 | if (atomic_read(&x->refcnt) > 2) { | |
249 | xfrm_state_gc_flush_bundles = 1; | |
250 | schedule_work(&xfrm_state_gc_work); | |
251 | } | |
252 | ||
253 | /* All xfrm_state objects are created by xfrm_state_alloc. | |
254 | * The xfrm_state_alloc call gives a reference, and that | |
255 | * is what we are dropping here. | |
256 | */ | |
21380b81 | 257 | __xfrm_state_put(x); |
26b15dad | 258 | err = 0; |
1da177e4 | 259 | } |
26b15dad JHS |
260 | |
261 | return err; | |
1da177e4 LT |
262 | } |
263 | ||
26b15dad | 264 | int xfrm_state_delete(struct xfrm_state *x) |
1da177e4 | 265 | { |
26b15dad JHS |
266 | int err; |
267 | ||
1da177e4 | 268 | spin_lock_bh(&x->lock); |
26b15dad | 269 | err = __xfrm_state_delete(x); |
1da177e4 | 270 | spin_unlock_bh(&x->lock); |
26b15dad JHS |
271 | |
272 | return err; | |
1da177e4 LT |
273 | } |
274 | EXPORT_SYMBOL(xfrm_state_delete); | |
275 | ||
276 | void xfrm_state_flush(u8 proto) | |
277 | { | |
278 | int i; | |
279 | struct xfrm_state *x; | |
280 | ||
281 | spin_lock_bh(&xfrm_state_lock); | |
282 | for (i = 0; i < XFRM_DST_HSIZE; i++) { | |
283 | restart: | |
284 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { | |
285 | if (!xfrm_state_kern(x) && | |
286 | (proto == IPSEC_PROTO_ANY || x->id.proto == proto)) { | |
287 | xfrm_state_hold(x); | |
288 | spin_unlock_bh(&xfrm_state_lock); | |
289 | ||
290 | xfrm_state_delete(x); | |
291 | xfrm_state_put(x); | |
292 | ||
293 | spin_lock_bh(&xfrm_state_lock); | |
294 | goto restart; | |
295 | } | |
296 | } | |
297 | } | |
298 | spin_unlock_bh(&xfrm_state_lock); | |
299 | wake_up(&km_waitq); | |
300 | } | |
301 | EXPORT_SYMBOL(xfrm_state_flush); | |
302 | ||
303 | static int | |
304 | xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl, | |
305 | struct xfrm_tmpl *tmpl, | |
306 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
307 | unsigned short family) | |
308 | { | |
309 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
310 | if (!afinfo) | |
311 | return -1; | |
312 | afinfo->init_tempsel(x, fl, tmpl, daddr, saddr); | |
313 | xfrm_state_put_afinfo(afinfo); | |
314 | return 0; | |
315 | } | |
316 | ||
317 | struct xfrm_state * | |
318 | xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr, | |
319 | struct flowi *fl, struct xfrm_tmpl *tmpl, | |
320 | struct xfrm_policy *pol, int *err, | |
321 | unsigned short family) | |
322 | { | |
323 | unsigned h = xfrm_dst_hash(daddr, family); | |
324 | struct xfrm_state *x, *x0; | |
325 | int acquire_in_progress = 0; | |
326 | int error = 0; | |
327 | struct xfrm_state *best = NULL; | |
328 | struct xfrm_state_afinfo *afinfo; | |
329 | ||
330 | afinfo = xfrm_state_get_afinfo(family); | |
331 | if (afinfo == NULL) { | |
332 | *err = -EAFNOSUPPORT; | |
333 | return NULL; | |
334 | } | |
335 | ||
336 | spin_lock_bh(&xfrm_state_lock); | |
337 | list_for_each_entry(x, xfrm_state_bydst+h, bydst) { | |
338 | if (x->props.family == family && | |
339 | x->props.reqid == tmpl->reqid && | |
340 | xfrm_state_addr_check(x, daddr, saddr, family) && | |
341 | tmpl->mode == x->props.mode && | |
342 | tmpl->id.proto == x->id.proto && | |
343 | (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) { | |
344 | /* Resolution logic: | |
345 | 1. There is a valid state with matching selector. | |
346 | Done. | |
347 | 2. Valid state with inappropriate selector. Skip. | |
348 | ||
349 | Entering area of "sysdeps". | |
350 | ||
351 | 3. If state is not valid, selector is temporary, | |
352 | it selects only session which triggered | |
353 | previous resolution. Key manager will do | |
354 | something to install a state with proper | |
355 | selector. | |
356 | */ | |
357 | if (x->km.state == XFRM_STATE_VALID) { | |
df71837d TJ |
358 | if (!xfrm_selector_match(&x->sel, fl, family) || |
359 | !xfrm_sec_ctx_match(pol->security, x->security)) | |
1da177e4 LT |
360 | continue; |
361 | if (!best || | |
362 | best->km.dying > x->km.dying || | |
363 | (best->km.dying == x->km.dying && | |
364 | best->curlft.add_time < x->curlft.add_time)) | |
365 | best = x; | |
366 | } else if (x->km.state == XFRM_STATE_ACQ) { | |
367 | acquire_in_progress = 1; | |
368 | } else if (x->km.state == XFRM_STATE_ERROR || | |
369 | x->km.state == XFRM_STATE_EXPIRED) { | |
df71837d TJ |
370 | if (xfrm_selector_match(&x->sel, fl, family) && |
371 | xfrm_sec_ctx_match(pol->security, x->security)) | |
1da177e4 LT |
372 | error = -ESRCH; |
373 | } | |
374 | } | |
375 | } | |
376 | ||
377 | x = best; | |
378 | if (!x && !error && !acquire_in_progress) { | |
5c5d281a PM |
379 | if (tmpl->id.spi && |
380 | (x0 = afinfo->state_lookup(daddr, tmpl->id.spi, | |
381 | tmpl->id.proto)) != NULL) { | |
1da177e4 LT |
382 | xfrm_state_put(x0); |
383 | error = -EEXIST; | |
384 | goto out; | |
385 | } | |
386 | x = xfrm_state_alloc(); | |
387 | if (x == NULL) { | |
388 | error = -ENOMEM; | |
389 | goto out; | |
390 | } | |
391 | /* Initialize temporary selector matching only | |
392 | * to current session. */ | |
393 | xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family); | |
394 | ||
395 | if (km_query(x, tmpl, pol) == 0) { | |
396 | x->km.state = XFRM_STATE_ACQ; | |
397 | list_add_tail(&x->bydst, xfrm_state_bydst+h); | |
398 | xfrm_state_hold(x); | |
399 | if (x->id.spi) { | |
400 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family); | |
401 | list_add(&x->byspi, xfrm_state_byspi+h); | |
402 | xfrm_state_hold(x); | |
403 | } | |
404 | x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES; | |
405 | xfrm_state_hold(x); | |
406 | x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ; | |
407 | add_timer(&x->timer); | |
408 | } else { | |
409 | x->km.state = XFRM_STATE_DEAD; | |
410 | xfrm_state_put(x); | |
411 | x = NULL; | |
412 | error = -ESRCH; | |
413 | } | |
414 | } | |
415 | out: | |
416 | if (x) | |
417 | xfrm_state_hold(x); | |
418 | else | |
419 | *err = acquire_in_progress ? -EAGAIN : error; | |
420 | spin_unlock_bh(&xfrm_state_lock); | |
421 | xfrm_state_put_afinfo(afinfo); | |
422 | return x; | |
423 | } | |
424 | ||
425 | static void __xfrm_state_insert(struct xfrm_state *x) | |
426 | { | |
427 | unsigned h = xfrm_dst_hash(&x->id.daddr, x->props.family); | |
428 | ||
429 | list_add(&x->bydst, xfrm_state_bydst+h); | |
430 | xfrm_state_hold(x); | |
431 | ||
432 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); | |
433 | ||
434 | list_add(&x->byspi, xfrm_state_byspi+h); | |
435 | xfrm_state_hold(x); | |
436 | ||
437 | if (!mod_timer(&x->timer, jiffies + HZ)) | |
438 | xfrm_state_hold(x); | |
439 | ||
f8cd5488 JHS |
440 | if (x->replay_maxage && |
441 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) | |
442 | xfrm_state_hold(x); | |
443 | ||
1da177e4 LT |
444 | wake_up(&km_waitq); |
445 | } | |
446 | ||
447 | void xfrm_state_insert(struct xfrm_state *x) | |
448 | { | |
449 | spin_lock_bh(&xfrm_state_lock); | |
450 | __xfrm_state_insert(x); | |
451 | spin_unlock_bh(&xfrm_state_lock); | |
399c180a DM |
452 | |
453 | xfrm_flush_all_bundles(); | |
1da177e4 LT |
454 | } |
455 | EXPORT_SYMBOL(xfrm_state_insert); | |
456 | ||
457 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq); | |
458 | ||
459 | int xfrm_state_add(struct xfrm_state *x) | |
460 | { | |
461 | struct xfrm_state_afinfo *afinfo; | |
462 | struct xfrm_state *x1; | |
463 | int family; | |
464 | int err; | |
465 | ||
466 | family = x->props.family; | |
467 | afinfo = xfrm_state_get_afinfo(family); | |
468 | if (unlikely(afinfo == NULL)) | |
469 | return -EAFNOSUPPORT; | |
470 | ||
471 | spin_lock_bh(&xfrm_state_lock); | |
472 | ||
473 | x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto); | |
474 | if (x1) { | |
475 | xfrm_state_put(x1); | |
476 | x1 = NULL; | |
477 | err = -EEXIST; | |
478 | goto out; | |
479 | } | |
480 | ||
481 | if (x->km.seq) { | |
482 | x1 = __xfrm_find_acq_byseq(x->km.seq); | |
483 | if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) { | |
484 | xfrm_state_put(x1); | |
485 | x1 = NULL; | |
486 | } | |
487 | } | |
488 | ||
489 | if (!x1) | |
490 | x1 = afinfo->find_acq( | |
491 | x->props.mode, x->props.reqid, x->id.proto, | |
492 | &x->id.daddr, &x->props.saddr, 0); | |
493 | ||
494 | __xfrm_state_insert(x); | |
495 | err = 0; | |
496 | ||
497 | out: | |
498 | spin_unlock_bh(&xfrm_state_lock); | |
499 | xfrm_state_put_afinfo(afinfo); | |
500 | ||
399c180a DM |
501 | if (!err) |
502 | xfrm_flush_all_bundles(); | |
503 | ||
1da177e4 LT |
504 | if (x1) { |
505 | xfrm_state_delete(x1); | |
506 | xfrm_state_put(x1); | |
507 | } | |
508 | ||
509 | return err; | |
510 | } | |
511 | EXPORT_SYMBOL(xfrm_state_add); | |
512 | ||
513 | int xfrm_state_update(struct xfrm_state *x) | |
514 | { | |
515 | struct xfrm_state_afinfo *afinfo; | |
516 | struct xfrm_state *x1; | |
517 | int err; | |
518 | ||
519 | afinfo = xfrm_state_get_afinfo(x->props.family); | |
520 | if (unlikely(afinfo == NULL)) | |
521 | return -EAFNOSUPPORT; | |
522 | ||
523 | spin_lock_bh(&xfrm_state_lock); | |
524 | x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto); | |
525 | ||
526 | err = -ESRCH; | |
527 | if (!x1) | |
528 | goto out; | |
529 | ||
530 | if (xfrm_state_kern(x1)) { | |
531 | xfrm_state_put(x1); | |
532 | err = -EEXIST; | |
533 | goto out; | |
534 | } | |
535 | ||
536 | if (x1->km.state == XFRM_STATE_ACQ) { | |
537 | __xfrm_state_insert(x); | |
538 | x = NULL; | |
539 | } | |
540 | err = 0; | |
541 | ||
542 | out: | |
543 | spin_unlock_bh(&xfrm_state_lock); | |
544 | xfrm_state_put_afinfo(afinfo); | |
545 | ||
546 | if (err) | |
547 | return err; | |
548 | ||
549 | if (!x) { | |
550 | xfrm_state_delete(x1); | |
551 | xfrm_state_put(x1); | |
552 | return 0; | |
553 | } | |
554 | ||
555 | err = -EINVAL; | |
556 | spin_lock_bh(&x1->lock); | |
557 | if (likely(x1->km.state == XFRM_STATE_VALID)) { | |
558 | if (x->encap && x1->encap) | |
559 | memcpy(x1->encap, x->encap, sizeof(*x1->encap)); | |
560 | memcpy(&x1->lft, &x->lft, sizeof(x1->lft)); | |
561 | x1->km.dying = 0; | |
562 | ||
563 | if (!mod_timer(&x1->timer, jiffies + HZ)) | |
564 | xfrm_state_hold(x1); | |
565 | if (x1->curlft.use_time) | |
566 | xfrm_state_check_expire(x1); | |
567 | ||
568 | err = 0; | |
569 | } | |
570 | spin_unlock_bh(&x1->lock); | |
571 | ||
572 | xfrm_state_put(x1); | |
573 | ||
574 | return err; | |
575 | } | |
576 | EXPORT_SYMBOL(xfrm_state_update); | |
577 | ||
578 | int xfrm_state_check_expire(struct xfrm_state *x) | |
579 | { | |
580 | if (!x->curlft.use_time) | |
581 | x->curlft.use_time = (unsigned long)xtime.tv_sec; | |
582 | ||
583 | if (x->km.state != XFRM_STATE_VALID) | |
584 | return -EINVAL; | |
585 | ||
586 | if (x->curlft.bytes >= x->lft.hard_byte_limit || | |
587 | x->curlft.packets >= x->lft.hard_packet_limit) { | |
4666faab HX |
588 | x->km.state = XFRM_STATE_EXPIRED; |
589 | if (!mod_timer(&x->timer, jiffies)) | |
1da177e4 LT |
590 | xfrm_state_hold(x); |
591 | return -EINVAL; | |
592 | } | |
593 | ||
594 | if (!x->km.dying && | |
595 | (x->curlft.bytes >= x->lft.soft_byte_limit || | |
4666faab HX |
596 | x->curlft.packets >= x->lft.soft_packet_limit)) { |
597 | x->km.dying = 1; | |
1da177e4 | 598 | km_state_expired(x, 0); |
4666faab | 599 | } |
1da177e4 LT |
600 | return 0; |
601 | } | |
602 | EXPORT_SYMBOL(xfrm_state_check_expire); | |
603 | ||
604 | static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb) | |
605 | { | |
606 | int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev) | |
607 | - skb_headroom(skb); | |
608 | ||
609 | if (nhead > 0) | |
610 | return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); | |
611 | ||
612 | /* Check tail too... */ | |
613 | return 0; | |
614 | } | |
615 | ||
616 | int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb) | |
617 | { | |
618 | int err = xfrm_state_check_expire(x); | |
619 | if (err < 0) | |
620 | goto err; | |
621 | err = xfrm_state_check_space(x, skb); | |
622 | err: | |
623 | return err; | |
624 | } | |
625 | EXPORT_SYMBOL(xfrm_state_check); | |
626 | ||
627 | struct xfrm_state * | |
628 | xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto, | |
629 | unsigned short family) | |
630 | { | |
631 | struct xfrm_state *x; | |
632 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
633 | if (!afinfo) | |
634 | return NULL; | |
635 | ||
636 | spin_lock_bh(&xfrm_state_lock); | |
637 | x = afinfo->state_lookup(daddr, spi, proto); | |
638 | spin_unlock_bh(&xfrm_state_lock); | |
639 | xfrm_state_put_afinfo(afinfo); | |
640 | return x; | |
641 | } | |
642 | EXPORT_SYMBOL(xfrm_state_lookup); | |
643 | ||
644 | struct xfrm_state * | |
645 | xfrm_find_acq(u8 mode, u32 reqid, u8 proto, | |
646 | xfrm_address_t *daddr, xfrm_address_t *saddr, | |
647 | int create, unsigned short family) | |
648 | { | |
649 | struct xfrm_state *x; | |
650 | struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); | |
651 | if (!afinfo) | |
652 | return NULL; | |
653 | ||
654 | spin_lock_bh(&xfrm_state_lock); | |
655 | x = afinfo->find_acq(mode, reqid, proto, daddr, saddr, create); | |
656 | spin_unlock_bh(&xfrm_state_lock); | |
657 | xfrm_state_put_afinfo(afinfo); | |
658 | return x; | |
659 | } | |
660 | EXPORT_SYMBOL(xfrm_find_acq); | |
661 | ||
662 | /* Silly enough, but I'm lazy to build resolution list */ | |
663 | ||
664 | static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq) | |
665 | { | |
666 | int i; | |
667 | struct xfrm_state *x; | |
668 | ||
669 | for (i = 0; i < XFRM_DST_HSIZE; i++) { | |
670 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { | |
671 | if (x->km.seq == seq && x->km.state == XFRM_STATE_ACQ) { | |
672 | xfrm_state_hold(x); | |
673 | return x; | |
674 | } | |
675 | } | |
676 | } | |
677 | return NULL; | |
678 | } | |
679 | ||
680 | struct xfrm_state *xfrm_find_acq_byseq(u32 seq) | |
681 | { | |
682 | struct xfrm_state *x; | |
683 | ||
684 | spin_lock_bh(&xfrm_state_lock); | |
685 | x = __xfrm_find_acq_byseq(seq); | |
686 | spin_unlock_bh(&xfrm_state_lock); | |
687 | return x; | |
688 | } | |
689 | EXPORT_SYMBOL(xfrm_find_acq_byseq); | |
690 | ||
691 | u32 xfrm_get_acqseq(void) | |
692 | { | |
693 | u32 res; | |
694 | static u32 acqseq; | |
695 | static DEFINE_SPINLOCK(acqseq_lock); | |
696 | ||
697 | spin_lock_bh(&acqseq_lock); | |
698 | res = (++acqseq ? : ++acqseq); | |
699 | spin_unlock_bh(&acqseq_lock); | |
700 | return res; | |
701 | } | |
702 | EXPORT_SYMBOL(xfrm_get_acqseq); | |
703 | ||
704 | void | |
705 | xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi) | |
706 | { | |
707 | u32 h; | |
708 | struct xfrm_state *x0; | |
709 | ||
710 | if (x->id.spi) | |
711 | return; | |
712 | ||
713 | if (minspi == maxspi) { | |
714 | x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family); | |
715 | if (x0) { | |
716 | xfrm_state_put(x0); | |
717 | return; | |
718 | } | |
719 | x->id.spi = minspi; | |
720 | } else { | |
721 | u32 spi = 0; | |
722 | minspi = ntohl(minspi); | |
723 | maxspi = ntohl(maxspi); | |
724 | for (h=0; h<maxspi-minspi+1; h++) { | |
725 | spi = minspi + net_random()%(maxspi-minspi+1); | |
726 | x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family); | |
727 | if (x0 == NULL) { | |
728 | x->id.spi = htonl(spi); | |
729 | break; | |
730 | } | |
731 | xfrm_state_put(x0); | |
732 | } | |
733 | } | |
734 | if (x->id.spi) { | |
735 | spin_lock_bh(&xfrm_state_lock); | |
736 | h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family); | |
737 | list_add(&x->byspi, xfrm_state_byspi+h); | |
738 | xfrm_state_hold(x); | |
739 | spin_unlock_bh(&xfrm_state_lock); | |
740 | wake_up(&km_waitq); | |
741 | } | |
742 | } | |
743 | EXPORT_SYMBOL(xfrm_alloc_spi); | |
744 | ||
745 | int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*), | |
746 | void *data) | |
747 | { | |
748 | int i; | |
749 | struct xfrm_state *x; | |
750 | int count = 0; | |
751 | int err = 0; | |
752 | ||
753 | spin_lock_bh(&xfrm_state_lock); | |
754 | for (i = 0; i < XFRM_DST_HSIZE; i++) { | |
755 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { | |
756 | if (proto == IPSEC_PROTO_ANY || x->id.proto == proto) | |
757 | count++; | |
758 | } | |
759 | } | |
760 | if (count == 0) { | |
761 | err = -ENOENT; | |
762 | goto out; | |
763 | } | |
764 | ||
765 | for (i = 0; i < XFRM_DST_HSIZE; i++) { | |
766 | list_for_each_entry(x, xfrm_state_bydst+i, bydst) { | |
767 | if (proto != IPSEC_PROTO_ANY && x->id.proto != proto) | |
768 | continue; | |
769 | err = func(x, --count, data); | |
770 | if (err) | |
771 | goto out; | |
772 | } | |
773 | } | |
774 | out: | |
775 | spin_unlock_bh(&xfrm_state_lock); | |
776 | return err; | |
777 | } | |
778 | EXPORT_SYMBOL(xfrm_state_walk); | |
779 | ||
f8cd5488 JHS |
780 | |
781 | void xfrm_replay_notify(struct xfrm_state *x, int event) | |
782 | { | |
783 | struct km_event c; | |
784 | /* we send notify messages in case | |
785 | * 1. we updated on of the sequence numbers, and the seqno difference | |
786 | * is at least x->replay_maxdiff, in this case we also update the | |
787 | * timeout of our timer function | |
788 | * 2. if x->replay_maxage has elapsed since last update, | |
789 | * and there were changes | |
790 | * | |
791 | * The state structure must be locked! | |
792 | */ | |
793 | ||
794 | switch (event) { | |
795 | case XFRM_REPLAY_UPDATE: | |
796 | if (x->replay_maxdiff && | |
797 | (x->replay.seq - x->preplay.seq < x->replay_maxdiff) && | |
798 | (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) | |
799 | return; | |
800 | ||
801 | break; | |
802 | ||
803 | case XFRM_REPLAY_TIMEOUT: | |
804 | if ((x->replay.seq == x->preplay.seq) && | |
805 | (x->replay.bitmap == x->preplay.bitmap) && | |
806 | (x->replay.oseq == x->preplay.oseq)) | |
807 | return; | |
808 | ||
809 | break; | |
810 | } | |
811 | ||
812 | memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state)); | |
813 | c.event = XFRM_MSG_NEWAE; | |
814 | c.data.aevent = event; | |
815 | km_state_notify(x, &c); | |
816 | ||
817 | resched: | |
818 | if (x->replay_maxage && | |
819 | !mod_timer(&x->rtimer, jiffies + x->replay_maxage)) | |
820 | xfrm_state_hold(x); | |
821 | ||
822 | } | |
823 | ||
824 | static void xfrm_replay_timer_handler(unsigned long data) | |
825 | { | |
826 | struct xfrm_state *x = (struct xfrm_state*)data; | |
827 | ||
828 | spin_lock(&x->lock); | |
829 | ||
830 | if (xfrm_aevent_is_on() && x->km.state == XFRM_STATE_VALID) | |
831 | xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT); | |
832 | ||
833 | spin_unlock(&x->lock); | |
834 | } | |
835 | ||
1da177e4 LT |
836 | int xfrm_replay_check(struct xfrm_state *x, u32 seq) |
837 | { | |
838 | u32 diff; | |
839 | ||
840 | seq = ntohl(seq); | |
841 | ||
842 | if (unlikely(seq == 0)) | |
843 | return -EINVAL; | |
844 | ||
845 | if (likely(seq > x->replay.seq)) | |
846 | return 0; | |
847 | ||
848 | diff = x->replay.seq - seq; | |
849 | if (diff >= x->props.replay_window) { | |
850 | x->stats.replay_window++; | |
851 | return -EINVAL; | |
852 | } | |
853 | ||
854 | if (x->replay.bitmap & (1U << diff)) { | |
855 | x->stats.replay++; | |
856 | return -EINVAL; | |
857 | } | |
858 | return 0; | |
859 | } | |
860 | EXPORT_SYMBOL(xfrm_replay_check); | |
861 | ||
862 | void xfrm_replay_advance(struct xfrm_state *x, u32 seq) | |
863 | { | |
864 | u32 diff; | |
865 | ||
866 | seq = ntohl(seq); | |
867 | ||
868 | if (seq > x->replay.seq) { | |
869 | diff = seq - x->replay.seq; | |
870 | if (diff < x->props.replay_window) | |
871 | x->replay.bitmap = ((x->replay.bitmap) << diff) | 1; | |
872 | else | |
873 | x->replay.bitmap = 1; | |
874 | x->replay.seq = seq; | |
875 | } else { | |
876 | diff = x->replay.seq - seq; | |
877 | x->replay.bitmap |= (1U << diff); | |
878 | } | |
f8cd5488 JHS |
879 | |
880 | if (xfrm_aevent_is_on()) | |
881 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); | |
1da177e4 LT |
882 | } |
883 | EXPORT_SYMBOL(xfrm_replay_advance); | |
884 | ||
885 | static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list); | |
886 | static DEFINE_RWLOCK(xfrm_km_lock); | |
887 | ||
26b15dad | 888 | void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c) |
1da177e4 LT |
889 | { |
890 | struct xfrm_mgr *km; | |
891 | ||
26b15dad JHS |
892 | read_lock(&xfrm_km_lock); |
893 | list_for_each_entry(km, &xfrm_km_list, list) | |
894 | if (km->notify_policy) | |
895 | km->notify_policy(xp, dir, c); | |
896 | read_unlock(&xfrm_km_lock); | |
897 | } | |
1da177e4 | 898 | |
26b15dad JHS |
899 | void km_state_notify(struct xfrm_state *x, struct km_event *c) |
900 | { | |
901 | struct xfrm_mgr *km; | |
1da177e4 LT |
902 | read_lock(&xfrm_km_lock); |
903 | list_for_each_entry(km, &xfrm_km_list, list) | |
26b15dad JHS |
904 | if (km->notify) |
905 | km->notify(x, c); | |
1da177e4 | 906 | read_unlock(&xfrm_km_lock); |
26b15dad JHS |
907 | } |
908 | ||
909 | EXPORT_SYMBOL(km_policy_notify); | |
910 | EXPORT_SYMBOL(km_state_notify); | |
911 | ||
f8cd5488 | 912 | void km_state_expired(struct xfrm_state *x, int hard) |
26b15dad JHS |
913 | { |
914 | struct km_event c; | |
915 | ||
bf08867f | 916 | c.data.hard = hard; |
f60f6b8f | 917 | c.event = XFRM_MSG_EXPIRE; |
26b15dad | 918 | km_state_notify(x, &c); |
1da177e4 LT |
919 | |
920 | if (hard) | |
921 | wake_up(&km_waitq); | |
922 | } | |
923 | ||
26b15dad JHS |
924 | /* |
925 | * We send to all registered managers regardless of failure | |
926 | * We are happy with one success | |
927 | */ | |
1da177e4 LT |
928 | static int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol) |
929 | { | |
26b15dad | 930 | int err = -EINVAL, acqret; |
1da177e4 LT |
931 | struct xfrm_mgr *km; |
932 | ||
933 | read_lock(&xfrm_km_lock); | |
934 | list_for_each_entry(km, &xfrm_km_list, list) { | |
26b15dad JHS |
935 | acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT); |
936 | if (!acqret) | |
937 | err = acqret; | |
1da177e4 LT |
938 | } |
939 | read_unlock(&xfrm_km_lock); | |
940 | return err; | |
941 | } | |
942 | ||
943 | int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport) | |
944 | { | |
945 | int err = -EINVAL; | |
946 | struct xfrm_mgr *km; | |
947 | ||
948 | read_lock(&xfrm_km_lock); | |
949 | list_for_each_entry(km, &xfrm_km_list, list) { | |
950 | if (km->new_mapping) | |
951 | err = km->new_mapping(x, ipaddr, sport); | |
952 | if (!err) | |
953 | break; | |
954 | } | |
955 | read_unlock(&xfrm_km_lock); | |
956 | return err; | |
957 | } | |
958 | EXPORT_SYMBOL(km_new_mapping); | |
959 | ||
960 | void km_policy_expired(struct xfrm_policy *pol, int dir, int hard) | |
961 | { | |
26b15dad | 962 | struct km_event c; |
1da177e4 | 963 | |
bf08867f | 964 | c.data.hard = hard; |
f60f6b8f | 965 | c.event = XFRM_MSG_POLEXPIRE; |
26b15dad | 966 | km_policy_notify(pol, dir, &c); |
1da177e4 LT |
967 | |
968 | if (hard) | |
969 | wake_up(&km_waitq); | |
970 | } | |
971 | ||
972 | int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen) | |
973 | { | |
974 | int err; | |
975 | u8 *data; | |
976 | struct xfrm_mgr *km; | |
977 | struct xfrm_policy *pol = NULL; | |
978 | ||
979 | if (optlen <= 0 || optlen > PAGE_SIZE) | |
980 | return -EMSGSIZE; | |
981 | ||
982 | data = kmalloc(optlen, GFP_KERNEL); | |
983 | if (!data) | |
984 | return -ENOMEM; | |
985 | ||
986 | err = -EFAULT; | |
987 | if (copy_from_user(data, optval, optlen)) | |
988 | goto out; | |
989 | ||
990 | err = -EINVAL; | |
991 | read_lock(&xfrm_km_lock); | |
992 | list_for_each_entry(km, &xfrm_km_list, list) { | |
993 | pol = km->compile_policy(sk->sk_family, optname, data, | |
994 | optlen, &err); | |
995 | if (err >= 0) | |
996 | break; | |
997 | } | |
998 | read_unlock(&xfrm_km_lock); | |
999 | ||
1000 | if (err >= 0) { | |
1001 | xfrm_sk_policy_insert(sk, err, pol); | |
1002 | xfrm_pol_put(pol); | |
1003 | err = 0; | |
1004 | } | |
1005 | ||
1006 | out: | |
1007 | kfree(data); | |
1008 | return err; | |
1009 | } | |
1010 | EXPORT_SYMBOL(xfrm_user_policy); | |
1011 | ||
1012 | int xfrm_register_km(struct xfrm_mgr *km) | |
1013 | { | |
1014 | write_lock_bh(&xfrm_km_lock); | |
1015 | list_add_tail(&km->list, &xfrm_km_list); | |
1016 | write_unlock_bh(&xfrm_km_lock); | |
1017 | return 0; | |
1018 | } | |
1019 | EXPORT_SYMBOL(xfrm_register_km); | |
1020 | ||
1021 | int xfrm_unregister_km(struct xfrm_mgr *km) | |
1022 | { | |
1023 | write_lock_bh(&xfrm_km_lock); | |
1024 | list_del(&km->list); | |
1025 | write_unlock_bh(&xfrm_km_lock); | |
1026 | return 0; | |
1027 | } | |
1028 | EXPORT_SYMBOL(xfrm_unregister_km); | |
1029 | ||
1030 | int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo) | |
1031 | { | |
1032 | int err = 0; | |
1033 | if (unlikely(afinfo == NULL)) | |
1034 | return -EINVAL; | |
1035 | if (unlikely(afinfo->family >= NPROTO)) | |
1036 | return -EAFNOSUPPORT; | |
1037 | write_lock(&xfrm_state_afinfo_lock); | |
1038 | if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL)) | |
1039 | err = -ENOBUFS; | |
1040 | else { | |
1041 | afinfo->state_bydst = xfrm_state_bydst; | |
1042 | afinfo->state_byspi = xfrm_state_byspi; | |
1043 | xfrm_state_afinfo[afinfo->family] = afinfo; | |
1044 | } | |
1045 | write_unlock(&xfrm_state_afinfo_lock); | |
1046 | return err; | |
1047 | } | |
1048 | EXPORT_SYMBOL(xfrm_state_register_afinfo); | |
1049 | ||
1050 | int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo) | |
1051 | { | |
1052 | int err = 0; | |
1053 | if (unlikely(afinfo == NULL)) | |
1054 | return -EINVAL; | |
1055 | if (unlikely(afinfo->family >= NPROTO)) | |
1056 | return -EAFNOSUPPORT; | |
1057 | write_lock(&xfrm_state_afinfo_lock); | |
1058 | if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) { | |
1059 | if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo)) | |
1060 | err = -EINVAL; | |
1061 | else { | |
1062 | xfrm_state_afinfo[afinfo->family] = NULL; | |
1063 | afinfo->state_byspi = NULL; | |
1064 | afinfo->state_bydst = NULL; | |
1065 | } | |
1066 | } | |
1067 | write_unlock(&xfrm_state_afinfo_lock); | |
1068 | return err; | |
1069 | } | |
1070 | EXPORT_SYMBOL(xfrm_state_unregister_afinfo); | |
1071 | ||
1072 | static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family) | |
1073 | { | |
1074 | struct xfrm_state_afinfo *afinfo; | |
1075 | if (unlikely(family >= NPROTO)) | |
1076 | return NULL; | |
1077 | read_lock(&xfrm_state_afinfo_lock); | |
1078 | afinfo = xfrm_state_afinfo[family]; | |
1079 | if (likely(afinfo != NULL)) | |
1080 | read_lock(&afinfo->lock); | |
1081 | read_unlock(&xfrm_state_afinfo_lock); | |
1082 | return afinfo; | |
1083 | } | |
1084 | ||
1085 | static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) | |
1086 | { | |
1087 | if (unlikely(afinfo == NULL)) | |
1088 | return; | |
1089 | read_unlock(&afinfo->lock); | |
1090 | } | |
1091 | ||
1092 | /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */ | |
1093 | void xfrm_state_delete_tunnel(struct xfrm_state *x) | |
1094 | { | |
1095 | if (x->tunnel) { | |
1096 | struct xfrm_state *t = x->tunnel; | |
1097 | ||
1098 | if (atomic_read(&t->tunnel_users) == 2) | |
1099 | xfrm_state_delete(t); | |
1100 | atomic_dec(&t->tunnel_users); | |
1101 | xfrm_state_put(t); | |
1102 | x->tunnel = NULL; | |
1103 | } | |
1104 | } | |
1105 | EXPORT_SYMBOL(xfrm_state_delete_tunnel); | |
1106 | ||
80b30c10 HX |
1107 | /* |
1108 | * This function is NOT optimal. For example, with ESP it will give an | |
1109 | * MTU that's usually two bytes short of being optimal. However, it will | |
1110 | * usually give an answer that's a multiple of 4 provided the input is | |
1111 | * also a multiple of 4. | |
1112 | */ | |
1da177e4 LT |
1113 | int xfrm_state_mtu(struct xfrm_state *x, int mtu) |
1114 | { | |
1115 | int res = mtu; | |
1116 | ||
1117 | res -= x->props.header_len; | |
1118 | ||
1119 | for (;;) { | |
1120 | int m = res; | |
1121 | ||
1122 | if (m < 68) | |
1123 | return 68; | |
1124 | ||
1125 | spin_lock_bh(&x->lock); | |
1126 | if (x->km.state == XFRM_STATE_VALID && | |
1127 | x->type && x->type->get_max_size) | |
1128 | m = x->type->get_max_size(x, m); | |
1129 | else | |
1130 | m += x->props.header_len; | |
1131 | spin_unlock_bh(&x->lock); | |
1132 | ||
1133 | if (m <= mtu) | |
1134 | break; | |
1135 | res -= (m - mtu); | |
1136 | } | |
1137 | ||
1138 | return res; | |
1139 | } | |
1140 | ||
1141 | EXPORT_SYMBOL(xfrm_state_mtu); | |
72cb6962 HX |
1142 | |
1143 | int xfrm_init_state(struct xfrm_state *x) | |
1144 | { | |
d094cd83 HX |
1145 | struct xfrm_state_afinfo *afinfo; |
1146 | int family = x->props.family; | |
72cb6962 HX |
1147 | int err; |
1148 | ||
d094cd83 HX |
1149 | err = -EAFNOSUPPORT; |
1150 | afinfo = xfrm_state_get_afinfo(family); | |
1151 | if (!afinfo) | |
1152 | goto error; | |
1153 | ||
1154 | err = 0; | |
1155 | if (afinfo->init_flags) | |
1156 | err = afinfo->init_flags(x); | |
1157 | ||
1158 | xfrm_state_put_afinfo(afinfo); | |
1159 | ||
1160 | if (err) | |
1161 | goto error; | |
1162 | ||
1163 | err = -EPROTONOSUPPORT; | |
1164 | x->type = xfrm_get_type(x->id.proto, family); | |
72cb6962 HX |
1165 | if (x->type == NULL) |
1166 | goto error; | |
1167 | ||
1168 | err = x->type->init_state(x); | |
1169 | if (err) | |
1170 | goto error; | |
1171 | ||
1172 | x->km.state = XFRM_STATE_VALID; | |
1173 | ||
1174 | error: | |
1175 | return err; | |
1176 | } | |
1177 | ||
1178 | EXPORT_SYMBOL(xfrm_init_state); | |
1da177e4 LT |
1179 | |
1180 | void __init xfrm_state_init(void) | |
1181 | { | |
1182 | int i; | |
1183 | ||
1184 | for (i=0; i<XFRM_DST_HSIZE; i++) { | |
1185 | INIT_LIST_HEAD(&xfrm_state_bydst[i]); | |
1186 | INIT_LIST_HEAD(&xfrm_state_byspi[i]); | |
1187 | } | |
1188 | INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task, NULL); | |
1189 | } | |
1190 |