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[PATCH] ARM: pt_regs offsets
[linux-2.6/x86.git] / net / xfrm / xfrm_state.c
blobd11747c2a763f27a0a37eae59352bf61891a26b8
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
13 *
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
23 /* Each xfrm_state may be linked to two tables:
24
25 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
26 2. Hash table by daddr to find what SAs exist for given
27 destination/tunnel endpoint. (output)
28 */
29
30 static DEFINE_SPINLOCK(xfrm_state_lock);
31
32 /* Hash table to find appropriate SA towards given target (endpoint
33 * of tunnel or destination of transport mode) allowed by selector.
34 *
35 * Main use is finding SA after policy selected tunnel or transport mode.
36 * Also, it can be used by ah/esp icmp error handler to find offending SA.
37 */
38 static struct list_head xfrm_state_bydst[XFRM_DST_HSIZE];
39 static struct list_head xfrm_state_byspi[XFRM_DST_HSIZE];
40
41 DECLARE_WAIT_QUEUE_HEAD(km_waitq);
42 EXPORT_SYMBOL(km_waitq);
43
44 static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
45 static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
46
47 static struct work_struct xfrm_state_gc_work;
48 static struct list_head xfrm_state_gc_list = LIST_HEAD_INIT(xfrm_state_gc_list);
49 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
50
51 static int xfrm_state_gc_flush_bundles;
52
53 static void __xfrm_state_delete(struct xfrm_state *x);
54
55 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family);
56 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
57
58 static int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
59 static void km_state_expired(struct xfrm_state *x, int hard);
60
61 static void xfrm_state_gc_destroy(struct xfrm_state *x)
62 {
63 if (del_timer(&x->timer))
64 BUG();
65 if (x->aalg)
66 kfree(x->aalg);
67 if (x->ealg)
68 kfree(x->ealg);
69 if (x->calg)
70 kfree(x->calg);
71 if (x->encap)
72 kfree(x->encap);
73 if (x->type) {
74 x->type->destructor(x);
75 xfrm_put_type(x->type);
76 }
77 kfree(x);
78 }
79
80 static void xfrm_state_gc_task(void *data)
81 {
82 struct xfrm_state *x;
83 struct list_head *entry, *tmp;
84 struct list_head gc_list = LIST_HEAD_INIT(gc_list);
85
86 if (xfrm_state_gc_flush_bundles) {
87 xfrm_state_gc_flush_bundles = 0;
88 xfrm_flush_bundles();
89 }
90
91 spin_lock_bh(&xfrm_state_gc_lock);
92 list_splice_init(&xfrm_state_gc_list, &gc_list);
93 spin_unlock_bh(&xfrm_state_gc_lock);
94
95 list_for_each_safe(entry, tmp, &gc_list) {
96 x = list_entry(entry, struct xfrm_state, bydst);
97 xfrm_state_gc_destroy(x);
98 }
99 wake_up(&km_waitq);
100 }
101
102 static inline unsigned long make_jiffies(long secs)
103 {
104 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
105 return MAX_SCHEDULE_TIMEOUT-1;
106 else
107 return secs*HZ;
108 }
109
110 static void xfrm_timer_handler(unsigned long data)
111 {
112 struct xfrm_state *x = (struct xfrm_state*)data;
113 unsigned long now = (unsigned long)xtime.tv_sec;
114 long next = LONG_MAX;
115 int warn = 0;
116
117 spin_lock(&x->lock);
118 if (x->km.state == XFRM_STATE_DEAD)
119 goto out;
120 if (x->km.state == XFRM_STATE_EXPIRED)
121 goto expired;
122 if (x->lft.hard_add_expires_seconds) {
123 long tmo = x->lft.hard_add_expires_seconds +
124 x->curlft.add_time - now;
125 if (tmo <= 0)
126 goto expired;
127 if (tmo < next)
128 next = tmo;
129 }
130 if (x->lft.hard_use_expires_seconds) {
131 long tmo = x->lft.hard_use_expires_seconds +
132 (x->curlft.use_time ? : now) - now;
133 if (tmo <= 0)
134 goto expired;
135 if (tmo < next)
136 next = tmo;
137 }
138 if (x->km.dying)
139 goto resched;
140 if (x->lft.soft_add_expires_seconds) {
141 long tmo = x->lft.soft_add_expires_seconds +
142 x->curlft.add_time - now;
143 if (tmo <= 0)
144 warn = 1;
145 else if (tmo < next)
146 next = tmo;
147 }
148 if (x->lft.soft_use_expires_seconds) {
149 long tmo = x->lft.soft_use_expires_seconds +
150 (x->curlft.use_time ? : now) - now;
151 if (tmo <= 0)
152 warn = 1;
153 else if (tmo < next)
154 next = tmo;
155 }
156
157 if (warn)
158 km_state_expired(x, 0);
159 resched:
160 if (next != LONG_MAX &&
161 !mod_timer(&x->timer, jiffies + make_jiffies(next)))
162 xfrm_state_hold(x);
163 goto out;
164
165 expired:
166 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
167 x->km.state = XFRM_STATE_EXPIRED;
168 wake_up(&km_waitq);
169 next = 2;
170 goto resched;
171 }
172 if (x->id.spi != 0)
173 km_state_expired(x, 1);
174 __xfrm_state_delete(x);
175
176 out:
177 spin_unlock(&x->lock);
178 xfrm_state_put(x);
179 }
180
181 struct xfrm_state *xfrm_state_alloc(void)
182 {
183 struct xfrm_state *x;
184
185 x = kmalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
186
187 if (x) {
188 memset(x, 0, sizeof(struct xfrm_state));
189 atomic_set(&x->refcnt, 1);
190 atomic_set(&x->tunnel_users, 0);
191 INIT_LIST_HEAD(&x->bydst);
192 INIT_LIST_HEAD(&x->byspi);
193 init_timer(&x->timer);
194 x->timer.function = xfrm_timer_handler;
195 x->timer.data = (unsigned long)x;
196 x->curlft.add_time = (unsigned long)xtime.tv_sec;
197 x->lft.soft_byte_limit = XFRM_INF;
198 x->lft.soft_packet_limit = XFRM_INF;
199 x->lft.hard_byte_limit = XFRM_INF;
200 x->lft.hard_packet_limit = XFRM_INF;
201 spin_lock_init(&x->lock);
202 }
203 return x;
204 }
205 EXPORT_SYMBOL(xfrm_state_alloc);
206
207 void __xfrm_state_destroy(struct xfrm_state *x)
208 {
209 BUG_TRAP(x->km.state == XFRM_STATE_DEAD);
210
211 spin_lock_bh(&xfrm_state_gc_lock);
212 list_add(&x->bydst, &xfrm_state_gc_list);
213 spin_unlock_bh(&xfrm_state_gc_lock);
214 schedule_work(&xfrm_state_gc_work);
215 }
216 EXPORT_SYMBOL(__xfrm_state_destroy);
217
218 static void __xfrm_state_delete(struct xfrm_state *x)
219 {
220 if (x->km.state != XFRM_STATE_DEAD) {
221 x->km.state = XFRM_STATE_DEAD;
222 spin_lock(&xfrm_state_lock);
223 list_del(&x->bydst);
224 atomic_dec(&x->refcnt);
225 if (x->id.spi) {
226 list_del(&x->byspi);
227 atomic_dec(&x->refcnt);
228 }
229 spin_unlock(&xfrm_state_lock);
230 if (del_timer(&x->timer))
231 atomic_dec(&x->refcnt);
232
233 /* The number two in this test is the reference
234 * mentioned in the comment below plus the reference
235 * our caller holds. A larger value means that
236 * there are DSTs attached to this xfrm_state.
237 */
238 if (atomic_read(&x->refcnt) > 2) {
239 xfrm_state_gc_flush_bundles = 1;
240 schedule_work(&xfrm_state_gc_work);
241 }
242
243 /* All xfrm_state objects are created by xfrm_state_alloc.
244 * The xfrm_state_alloc call gives a reference, and that
245 * is what we are dropping here.
246 */
247 atomic_dec(&x->refcnt);
248 }
249 }
250
251 void xfrm_state_delete(struct xfrm_state *x)
252 {
253 spin_lock_bh(&x->lock);
254 __xfrm_state_delete(x);
255 spin_unlock_bh(&x->lock);
256 }
257 EXPORT_SYMBOL(xfrm_state_delete);
258
259 void xfrm_state_flush(u8 proto)
260 {
261 int i;
262 struct xfrm_state *x;
263
264 spin_lock_bh(&xfrm_state_lock);
265 for (i = 0; i < XFRM_DST_HSIZE; i++) {
266 restart:
267 list_for_each_entry(x, xfrm_state_bydst+i, bydst) {
268 if (!xfrm_state_kern(x) &&
269 (proto == IPSEC_PROTO_ANY || x->id.proto == proto)) {
270 xfrm_state_hold(x);
271 spin_unlock_bh(&xfrm_state_lock);
272
273 xfrm_state_delete(x);
274 xfrm_state_put(x);
275
276 spin_lock_bh(&xfrm_state_lock);
277 goto restart;
278 }
279 }
280 }
281 spin_unlock_bh(&xfrm_state_lock);
282 wake_up(&km_waitq);
283 }
284 EXPORT_SYMBOL(xfrm_state_flush);
285
286 static int
287 xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl,
288 struct xfrm_tmpl *tmpl,
289 xfrm_address_t *daddr, xfrm_address_t *saddr,
290 unsigned short family)
291 {
292 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
293 if (!afinfo)
294 return -1;
295 afinfo->init_tempsel(x, fl, tmpl, daddr, saddr);
296 xfrm_state_put_afinfo(afinfo);
297 return 0;
298 }
299
300 struct xfrm_state *
301 xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
302 struct flowi *fl, struct xfrm_tmpl *tmpl,
303 struct xfrm_policy *pol, int *err,
304 unsigned short family)
305 {
306 unsigned h = xfrm_dst_hash(daddr, family);
307 struct xfrm_state *x, *x0;
308 int acquire_in_progress = 0;
309 int error = 0;
310 struct xfrm_state *best = NULL;
311 struct xfrm_state_afinfo *afinfo;
312
313 afinfo = xfrm_state_get_afinfo(family);
314 if (afinfo == NULL) {
315 *err = -EAFNOSUPPORT;
316 return NULL;
317 }
318
319 spin_lock_bh(&xfrm_state_lock);
320 list_for_each_entry(x, xfrm_state_bydst+h, bydst) {
321 if (x->props.family == family &&
322 x->props.reqid == tmpl->reqid &&
323 xfrm_state_addr_check(x, daddr, saddr, family) &&
324 tmpl->mode == x->props.mode &&
325 tmpl->id.proto == x->id.proto &&
326 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) {
327 /* Resolution logic:
328 1. There is a valid state with matching selector.
329 Done.
330 2. Valid state with inappropriate selector. Skip.
331
332 Entering area of "sysdeps".
333
334 3. If state is not valid, selector is temporary,
335 it selects only session which triggered
336 previous resolution. Key manager will do
337 something to install a state with proper
338 selector.
339 */
340 if (x->km.state == XFRM_STATE_VALID) {
341 if (!xfrm_selector_match(&x->sel, fl, family))
342 continue;
343 if (!best ||
344 best->km.dying > x->km.dying ||
345 (best->km.dying == x->km.dying &&
346 best->curlft.add_time < x->curlft.add_time))
347 best = x;
348 } else if (x->km.state == XFRM_STATE_ACQ) {
349 acquire_in_progress = 1;
350 } else if (x->km.state == XFRM_STATE_ERROR ||
351 x->km.state == XFRM_STATE_EXPIRED) {
352 if (xfrm_selector_match(&x->sel, fl, family))
353 error = -ESRCH;
354 }
355 }
356 }
357
358 x = best;
359 if (!x && !error && !acquire_in_progress) {
360 if (tmpl->id.spi &&
361 (x0 = afinfo->state_lookup(daddr, tmpl->id.spi,
362 tmpl->id.proto)) != NULL) {
363 xfrm_state_put(x0);
364 error = -EEXIST;
365 goto out;
366 }
367 x = xfrm_state_alloc();
368 if (x == NULL) {
369 error = -ENOMEM;
370 goto out;
371 }
372 /* Initialize temporary selector matching only
373 * to current session. */
374 xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family);
375
376 if (km_query(x, tmpl, pol) == 0) {
377 x->km.state = XFRM_STATE_ACQ;
378 list_add_tail(&x->bydst, xfrm_state_bydst+h);
379 xfrm_state_hold(x);
380 if (x->id.spi) {
381 h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family);
382 list_add(&x->byspi, xfrm_state_byspi+h);
383 xfrm_state_hold(x);
384 }
385 x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
386 xfrm_state_hold(x);
387 x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
388 add_timer(&x->timer);
389 } else {
390 x->km.state = XFRM_STATE_DEAD;
391 xfrm_state_put(x);
392 x = NULL;
393 error = -ESRCH;
394 }
395 }
396 out:
397 if (x)
398 xfrm_state_hold(x);
399 else
400 *err = acquire_in_progress ? -EAGAIN : error;
401 spin_unlock_bh(&xfrm_state_lock);
402 xfrm_state_put_afinfo(afinfo);
403 return x;
404 }
405
406 static void __xfrm_state_insert(struct xfrm_state *x)
407 {
408 unsigned h = xfrm_dst_hash(&x->id.daddr, x->props.family);
409
410 list_add(&x->bydst, xfrm_state_bydst+h);
411 xfrm_state_hold(x);
412
413 h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family);
414
415 list_add(&x->byspi, xfrm_state_byspi+h);
416 xfrm_state_hold(x);
417
418 if (!mod_timer(&x->timer, jiffies + HZ))
419 xfrm_state_hold(x);
420
421 wake_up(&km_waitq);
422 }
423
424 void xfrm_state_insert(struct xfrm_state *x)
425 {
426 spin_lock_bh(&xfrm_state_lock);
427 __xfrm_state_insert(x);
428 spin_unlock_bh(&xfrm_state_lock);
429 }
430 EXPORT_SYMBOL(xfrm_state_insert);
431
432 static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq);
433
434 int xfrm_state_add(struct xfrm_state *x)
435 {
436 struct xfrm_state_afinfo *afinfo;
437 struct xfrm_state *x1;
438 int family;
439 int err;
440
441 family = x->props.family;
442 afinfo = xfrm_state_get_afinfo(family);
443 if (unlikely(afinfo == NULL))
444 return -EAFNOSUPPORT;
445
446 spin_lock_bh(&xfrm_state_lock);
447
448 x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto);
449 if (x1) {
450 xfrm_state_put(x1);
451 x1 = NULL;
452 err = -EEXIST;
453 goto out;
454 }
455
456 if (x->km.seq) {
457 x1 = __xfrm_find_acq_byseq(x->km.seq);
458 if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) {
459 xfrm_state_put(x1);
460 x1 = NULL;
461 }
462 }
463
464 if (!x1)
465 x1 = afinfo->find_acq(
466 x->props.mode, x->props.reqid, x->id.proto,
467 &x->id.daddr, &x->props.saddr, 0);
468
469 __xfrm_state_insert(x);
470 err = 0;
471
472 out:
473 spin_unlock_bh(&xfrm_state_lock);
474 xfrm_state_put_afinfo(afinfo);
475
476 if (x1) {
477 xfrm_state_delete(x1);
478 xfrm_state_put(x1);
479 }
480
481 return err;
482 }
483 EXPORT_SYMBOL(xfrm_state_add);
484
485 int xfrm_state_update(struct xfrm_state *x)
486 {
487 struct xfrm_state_afinfo *afinfo;
488 struct xfrm_state *x1;
489 int err;
490
491 afinfo = xfrm_state_get_afinfo(x->props.family);
492 if (unlikely(afinfo == NULL))
493 return -EAFNOSUPPORT;
494
495 spin_lock_bh(&xfrm_state_lock);
496 x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto);
497
498 err = -ESRCH;
499 if (!x1)
500 goto out;
501
502 if (xfrm_state_kern(x1)) {
503 xfrm_state_put(x1);
504 err = -EEXIST;
505 goto out;
506 }
507
508 if (x1->km.state == XFRM_STATE_ACQ) {
509 __xfrm_state_insert(x);
510 x = NULL;
511 }
512 err = 0;
513
514 out:
515 spin_unlock_bh(&xfrm_state_lock);
516 xfrm_state_put_afinfo(afinfo);
517
518 if (err)
519 return err;
520
521 if (!x) {
522 xfrm_state_delete(x1);
523 xfrm_state_put(x1);
524 return 0;
525 }
526
527 err = -EINVAL;
528 spin_lock_bh(&x1->lock);
529 if (likely(x1->km.state == XFRM_STATE_VALID)) {
530 if (x->encap && x1->encap)
531 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
532 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
533 x1->km.dying = 0;
534
535 if (!mod_timer(&x1->timer, jiffies + HZ))
536 xfrm_state_hold(x1);
537 if (x1->curlft.use_time)
538 xfrm_state_check_expire(x1);
539
540 err = 0;
541 }
542 spin_unlock_bh(&x1->lock);
543
544 xfrm_state_put(x1);
545
546 return err;
547 }
548 EXPORT_SYMBOL(xfrm_state_update);
549
550 int xfrm_state_check_expire(struct xfrm_state *x)
551 {
552 if (!x->curlft.use_time)
553 x->curlft.use_time = (unsigned long)xtime.tv_sec;
554
555 if (x->km.state != XFRM_STATE_VALID)
556 return -EINVAL;
557
558 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
559 x->curlft.packets >= x->lft.hard_packet_limit) {
560 km_state_expired(x, 1);
561 if (!mod_timer(&x->timer, jiffies + XFRM_ACQ_EXPIRES*HZ))
562 xfrm_state_hold(x);
563 return -EINVAL;
564 }
565
566 if (!x->km.dying &&
567 (x->curlft.bytes >= x->lft.soft_byte_limit ||
568 x->curlft.packets >= x->lft.soft_packet_limit))
569 km_state_expired(x, 0);
570 return 0;
571 }
572 EXPORT_SYMBOL(xfrm_state_check_expire);
573
574 static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb)
575 {
576 int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev)
577 - skb_headroom(skb);
578
579 if (nhead > 0)
580 return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
581
582 /* Check tail too... */
583 return 0;
584 }
585
586 int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb)
587 {
588 int err = xfrm_state_check_expire(x);
589 if (err < 0)
590 goto err;
591 err = xfrm_state_check_space(x, skb);
592 err:
593 return err;
594 }
595 EXPORT_SYMBOL(xfrm_state_check);
596
597 struct xfrm_state *
598 xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto,
599 unsigned short family)
600 {
601 struct xfrm_state *x;
602 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
603 if (!afinfo)
604 return NULL;
605
606 spin_lock_bh(&xfrm_state_lock);
607 x = afinfo->state_lookup(daddr, spi, proto);
608 spin_unlock_bh(&xfrm_state_lock);
609 xfrm_state_put_afinfo(afinfo);
610 return x;
611 }
612 EXPORT_SYMBOL(xfrm_state_lookup);
613
614 struct xfrm_state *
615 xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
616 xfrm_address_t *daddr, xfrm_address_t *saddr,
617 int create, unsigned short family)
618 {
619 struct xfrm_state *x;
620 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
621 if (!afinfo)
622 return NULL;
623
624 spin_lock_bh(&xfrm_state_lock);
625 x = afinfo->find_acq(mode, reqid, proto, daddr, saddr, create);
626 spin_unlock_bh(&xfrm_state_lock);
627 xfrm_state_put_afinfo(afinfo);
628 return x;
629 }
630 EXPORT_SYMBOL(xfrm_find_acq);
631
632 /* Silly enough, but I'm lazy to build resolution list */
633
634 static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq)
635 {
636 int i;
637 struct xfrm_state *x;
638
639 for (i = 0; i < XFRM_DST_HSIZE; i++) {
640 list_for_each_entry(x, xfrm_state_bydst+i, bydst) {
641 if (x->km.seq == seq && x->km.state == XFRM_STATE_ACQ) {
642 xfrm_state_hold(x);
643 return x;
644 }
645 }
646 }
647 return NULL;
648 }
649
650 struct xfrm_state *xfrm_find_acq_byseq(u32 seq)
651 {
652 struct xfrm_state *x;
653
654 spin_lock_bh(&xfrm_state_lock);
655 x = __xfrm_find_acq_byseq(seq);
656 spin_unlock_bh(&xfrm_state_lock);
657 return x;
658 }
659 EXPORT_SYMBOL(xfrm_find_acq_byseq);
660
661 u32 xfrm_get_acqseq(void)
662 {
663 u32 res;
664 static u32 acqseq;
665 static DEFINE_SPINLOCK(acqseq_lock);
666
667 spin_lock_bh(&acqseq_lock);
668 res = (++acqseq ? : ++acqseq);
669 spin_unlock_bh(&acqseq_lock);
670 return res;
671 }
672 EXPORT_SYMBOL(xfrm_get_acqseq);
673
674 void
675 xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi)
676 {
677 u32 h;
678 struct xfrm_state *x0;
679
680 if (x->id.spi)
681 return;
682
683 if (minspi == maxspi) {
684 x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family);
685 if (x0) {
686 xfrm_state_put(x0);
687 return;
688 }
689 x->id.spi = minspi;
690 } else {
691 u32 spi = 0;
692 minspi = ntohl(minspi);
693 maxspi = ntohl(maxspi);
694 for (h=0; h<maxspi-minspi+1; h++) {
695 spi = minspi + net_random()%(maxspi-minspi+1);
696 x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family);
697 if (x0 == NULL) {
698 x->id.spi = htonl(spi);
699 break;
700 }
701 xfrm_state_put(x0);
702 }
703 }
704 if (x->id.spi) {
705 spin_lock_bh(&xfrm_state_lock);
706 h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family);
707 list_add(&x->byspi, xfrm_state_byspi+h);
708 xfrm_state_hold(x);
709 spin_unlock_bh(&xfrm_state_lock);
710 wake_up(&km_waitq);
711 }
712 }
713 EXPORT_SYMBOL(xfrm_alloc_spi);
714
715 int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*),
716 void *data)
717 {
718 int i;
719 struct xfrm_state *x;
720 int count = 0;
721 int err = 0;
722
723 spin_lock_bh(&xfrm_state_lock);
724 for (i = 0; i < XFRM_DST_HSIZE; i++) {
725 list_for_each_entry(x, xfrm_state_bydst+i, bydst) {
726 if (proto == IPSEC_PROTO_ANY || x->id.proto == proto)
727 count++;
728 }
729 }
730 if (count == 0) {
731 err = -ENOENT;
732 goto out;
733 }
734
735 for (i = 0; i < XFRM_DST_HSIZE; i++) {
736 list_for_each_entry(x, xfrm_state_bydst+i, bydst) {
737 if (proto != IPSEC_PROTO_ANY && x->id.proto != proto)
738 continue;
739 err = func(x, --count, data);
740 if (err)
741 goto out;
742 }
743 }
744 out:
745 spin_unlock_bh(&xfrm_state_lock);
746 return err;
747 }
748 EXPORT_SYMBOL(xfrm_state_walk);
749
750 int xfrm_replay_check(struct xfrm_state *x, u32 seq)
751 {
752 u32 diff;
753
754 seq = ntohl(seq);
755
756 if (unlikely(seq == 0))
757 return -EINVAL;
758
759 if (likely(seq > x->replay.seq))
760 return 0;
761
762 diff = x->replay.seq - seq;
763 if (diff >= x->props.replay_window) {
764 x->stats.replay_window++;
765 return -EINVAL;
766 }
767
768 if (x->replay.bitmap & (1U << diff)) {
769 x->stats.replay++;
770 return -EINVAL;
771 }
772 return 0;
773 }
774 EXPORT_SYMBOL(xfrm_replay_check);
775
776 void xfrm_replay_advance(struct xfrm_state *x, u32 seq)
777 {
778 u32 diff;
779
780 seq = ntohl(seq);
781
782 if (seq > x->replay.seq) {
783 diff = seq - x->replay.seq;
784 if (diff < x->props.replay_window)
785 x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
786 else
787 x->replay.bitmap = 1;
788 x->replay.seq = seq;
789 } else {
790 diff = x->replay.seq - seq;
791 x->replay.bitmap |= (1U << diff);
792 }
793 }
794 EXPORT_SYMBOL(xfrm_replay_advance);
795
796 static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list);
797 static DEFINE_RWLOCK(xfrm_km_lock);
798
799 static void km_state_expired(struct xfrm_state *x, int hard)
800 {
801 struct xfrm_mgr *km;
802
803 if (hard)
804 x->km.state = XFRM_STATE_EXPIRED;
805 else
806 x->km.dying = 1;
807
808 read_lock(&xfrm_km_lock);
809 list_for_each_entry(km, &xfrm_km_list, list)
810 km->notify(x, hard);
811 read_unlock(&xfrm_km_lock);
812
813 if (hard)
814 wake_up(&km_waitq);
815 }
816
817 static int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
818 {
819 int err = -EINVAL;
820 struct xfrm_mgr *km;
821
822 read_lock(&xfrm_km_lock);
823 list_for_each_entry(km, &xfrm_km_list, list) {
824 err = km->acquire(x, t, pol, XFRM_POLICY_OUT);
825 if (!err)
826 break;
827 }
828 read_unlock(&xfrm_km_lock);
829 return err;
830 }
831
832 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
833 {
834 int err = -EINVAL;
835 struct xfrm_mgr *km;
836
837 read_lock(&xfrm_km_lock);
838 list_for_each_entry(km, &xfrm_km_list, list) {
839 if (km->new_mapping)
840 err = km->new_mapping(x, ipaddr, sport);
841 if (!err)
842 break;
843 }
844 read_unlock(&xfrm_km_lock);
845 return err;
846 }
847 EXPORT_SYMBOL(km_new_mapping);
848
849 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard)
850 {
851 struct xfrm_mgr *km;
852
853 read_lock(&xfrm_km_lock);
854 list_for_each_entry(km, &xfrm_km_list, list)
855 if (km->notify_policy)
856 km->notify_policy(pol, dir, hard);
857 read_unlock(&xfrm_km_lock);
858
859 if (hard)
860 wake_up(&km_waitq);
861 }
862
863 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
864 {
865 int err;
866 u8 *data;
867 struct xfrm_mgr *km;
868 struct xfrm_policy *pol = NULL;
869
870 if (optlen <= 0 || optlen > PAGE_SIZE)
871 return -EMSGSIZE;
872
873 data = kmalloc(optlen, GFP_KERNEL);
874 if (!data)
875 return -ENOMEM;
876
877 err = -EFAULT;
878 if (copy_from_user(data, optval, optlen))
879 goto out;
880
881 err = -EINVAL;
882 read_lock(&xfrm_km_lock);
883 list_for_each_entry(km, &xfrm_km_list, list) {
884 pol = km->compile_policy(sk->sk_family, optname, data,
885 optlen, &err);
886 if (err >= 0)
887 break;
888 }
889 read_unlock(&xfrm_km_lock);
890
891 if (err >= 0) {
892 xfrm_sk_policy_insert(sk, err, pol);
893 xfrm_pol_put(pol);
894 err = 0;
895 }
896
897 out:
898 kfree(data);
899 return err;
900 }
901 EXPORT_SYMBOL(xfrm_user_policy);
902
903 int xfrm_register_km(struct xfrm_mgr *km)
904 {
905 write_lock_bh(&xfrm_km_lock);
906 list_add_tail(&km->list, &xfrm_km_list);
907 write_unlock_bh(&xfrm_km_lock);
908 return 0;
909 }
910 EXPORT_SYMBOL(xfrm_register_km);
911
912 int xfrm_unregister_km(struct xfrm_mgr *km)
913 {
914 write_lock_bh(&xfrm_km_lock);
915 list_del(&km->list);
916 write_unlock_bh(&xfrm_km_lock);
917 return 0;
918 }
919 EXPORT_SYMBOL(xfrm_unregister_km);
920
921 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
922 {
923 int err = 0;
924 if (unlikely(afinfo == NULL))
925 return -EINVAL;
926 if (unlikely(afinfo->family >= NPROTO))
927 return -EAFNOSUPPORT;
928 write_lock(&xfrm_state_afinfo_lock);
929 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
930 err = -ENOBUFS;
931 else {
932 afinfo->state_bydst = xfrm_state_bydst;
933 afinfo->state_byspi = xfrm_state_byspi;
934 xfrm_state_afinfo[afinfo->family] = afinfo;
935 }
936 write_unlock(&xfrm_state_afinfo_lock);
937 return err;
938 }
939 EXPORT_SYMBOL(xfrm_state_register_afinfo);
940
941 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
942 {
943 int err = 0;
944 if (unlikely(afinfo == NULL))
945 return -EINVAL;
946 if (unlikely(afinfo->family >= NPROTO))
947 return -EAFNOSUPPORT;
948 write_lock(&xfrm_state_afinfo_lock);
949 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
950 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
951 err = -EINVAL;
952 else {
953 xfrm_state_afinfo[afinfo->family] = NULL;
954 afinfo->state_byspi = NULL;
955 afinfo->state_bydst = NULL;
956 }
957 }
958 write_unlock(&xfrm_state_afinfo_lock);
959 return err;
960 }
961 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
962
963 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family)
964 {
965 struct xfrm_state_afinfo *afinfo;
966 if (unlikely(family >= NPROTO))
967 return NULL;
968 read_lock(&xfrm_state_afinfo_lock);
969 afinfo = xfrm_state_afinfo[family];
970 if (likely(afinfo != NULL))
971 read_lock(&afinfo->lock);
972 read_unlock(&xfrm_state_afinfo_lock);
973 return afinfo;
974 }
975
976 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
977 {
978 if (unlikely(afinfo == NULL))
979 return;
980 read_unlock(&afinfo->lock);
981 }
982
983 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
984 void xfrm_state_delete_tunnel(struct xfrm_state *x)
985 {
986 if (x->tunnel) {
987 struct xfrm_state *t = x->tunnel;
988
989 if (atomic_read(&t->tunnel_users) == 2)
990 xfrm_state_delete(t);
991 atomic_dec(&t->tunnel_users);
992 xfrm_state_put(t);
993 x->tunnel = NULL;
994 }
995 }
996 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
997
998 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
999 {
1000 int res = mtu;
1001
1002 res -= x->props.header_len;
1003
1004 for (;;) {
1005 int m = res;
1006
1007 if (m < 68)
1008 return 68;
1009
1010 spin_lock_bh(&x->lock);
1011 if (x->km.state == XFRM_STATE_VALID &&
1012 x->type && x->type->get_max_size)
1013 m = x->type->get_max_size(x, m);
1014 else
1015 m += x->props.header_len;
1016 spin_unlock_bh(&x->lock);
1017
1018 if (m <= mtu)
1019 break;
1020 res -= (m - mtu);
1021 }
1022
1023 return res;
1024 }
1025
1026 EXPORT_SYMBOL(xfrm_state_mtu);
1027
1028 void __init xfrm_state_init(void)
1029 {
1030 int i;
1031
1032 for (i=0; i<XFRM_DST_HSIZE; i++) {
1033 INIT_LIST_HEAD(&xfrm_state_bydst[i]);
1034 INIT_LIST_HEAD(&xfrm_state_byspi[i]);
1035 }
1036 INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task, NULL);
1037 }
1038
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