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Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[deliverable/linux.git] / net / xfrm / xfrm_state.c
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 <linux/cache.h>
22 #include <asm/uaccess.h>
23
24 #include "xfrm_hash.h"
25
26 struct sock *xfrm_nl;
27 EXPORT_SYMBOL(xfrm_nl);
28
29 u32 sysctl_xfrm_aevent_etime = XFRM_AE_ETIME;
30 EXPORT_SYMBOL(sysctl_xfrm_aevent_etime);
31
32 u32 sysctl_xfrm_aevent_rseqth = XFRM_AE_SEQT_SIZE;
33 EXPORT_SYMBOL(sysctl_xfrm_aevent_rseqth);
34
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)
38 2. Hash table by (daddr,family,reqid) to find what SAs exist for given
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 */
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;
56 static unsigned int xfrm_state_genid;
57
58 static inline unsigned int xfrm_dst_hash(xfrm_address_t *daddr,
59 xfrm_address_t *saddr,
60 u32 reqid,
61 unsigned short family)
62 {
63 return __xfrm_dst_hash(daddr, saddr, reqid, family, xfrm_state_hmask);
64 }
65
66 static inline unsigned int xfrm_src_hash(xfrm_address_t *daddr,
67 xfrm_address_t *saddr,
68 unsigned short family)
69 {
70 return __xfrm_src_hash(daddr, saddr, family, xfrm_state_hmask);
71 }
72
73 static inline unsigned int
74 xfrm_spi_hash(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
75 {
76 return __xfrm_spi_hash(daddr, spi, proto, family, xfrm_state_hmask);
77 }
78
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
91 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
92 x->props.reqid, x->props.family,
93 nhashmask);
94 hlist_add_head(&x->bydst, ndsttable+h);
95
96 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
97 x->props.family,
98 nhashmask);
99 hlist_add_head(&x->bysrc, nsrctable+h);
100
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 }
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
118 static void xfrm_hash_resize(void *__unused)
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();
128 ndst = xfrm_hash_alloc(nsize);
129 if (!ndst)
130 goto out_unlock;
131 nsrc = xfrm_hash_alloc(nsize);
132 if (!nsrc) {
133 xfrm_hash_free(ndst, nsize);
134 goto out_unlock;
135 }
136 nspi = xfrm_hash_alloc(nsize);
137 if (!nspi) {
138 xfrm_hash_free(ndst, nsize);
139 xfrm_hash_free(nsrc, nsize);
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);
163 xfrm_hash_free(odst, osize);
164 xfrm_hash_free(osrc, osize);
165 xfrm_hash_free(ospi, osize);
166
167 out_unlock:
168 mutex_unlock(&hash_resize_mutex);
169 }
170
171 static DECLARE_WORK(xfrm_hash_work, xfrm_hash_resize, NULL);
172
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;
180 static HLIST_HEAD(xfrm_state_gc_list);
181 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
182
183 int __xfrm_state_delete(struct xfrm_state *x);
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
188 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
189 void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
190
191 static void xfrm_state_gc_destroy(struct xfrm_state *x)
192 {
193 del_timer_sync(&x->timer);
194 del_timer_sync(&x->rtimer);
195 kfree(x->aalg);
196 kfree(x->ealg);
197 kfree(x->calg);
198 kfree(x->encap);
199 kfree(x->coaddr);
200 if (x->mode)
201 xfrm_put_mode(x->mode);
202 if (x->type) {
203 x->type->destructor(x);
204 xfrm_put_type(x->type);
205 }
206 security_xfrm_state_free(x);
207 kfree(x);
208 }
209
210 static void xfrm_state_gc_task(void *data)
211 {
212 struct xfrm_state *x;
213 struct hlist_node *entry, *tmp;
214 struct hlist_head gc_list;
215
216 spin_lock_bh(&xfrm_state_gc_lock);
217 gc_list.first = xfrm_state_gc_list.first;
218 INIT_HLIST_HEAD(&xfrm_state_gc_list);
219 spin_unlock_bh(&xfrm_state_gc_lock);
220
221 hlist_for_each_entry_safe(x, entry, tmp, &gc_list, bydst)
222 xfrm_state_gc_destroy(x);
223
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
282 x->km.dying = warn;
283 if (warn)
284 km_state_expired(x, 0, 0);
285 resched:
286 if (next != LONG_MAX)
287 mod_timer(&x->timer, jiffies + make_jiffies(next));
288
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 }
298 if (!__xfrm_state_delete(x) && x->id.spi)
299 km_state_expired(x, 1, 0);
300
301 out:
302 spin_unlock(&x->lock);
303 }
304
305 static void xfrm_replay_timer_handler(unsigned long data);
306
307 struct xfrm_state *xfrm_state_alloc(void)
308 {
309 struct xfrm_state *x;
310
311 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
312
313 if (x) {
314 atomic_set(&x->refcnt, 1);
315 atomic_set(&x->tunnel_users, 0);
316 INIT_HLIST_NODE(&x->bydst);
317 INIT_HLIST_NODE(&x->bysrc);
318 INIT_HLIST_NODE(&x->byspi);
319 init_timer(&x->timer);
320 x->timer.function = xfrm_timer_handler;
321 x->timer.data = (unsigned long)x;
322 init_timer(&x->rtimer);
323 x->rtimer.function = xfrm_replay_timer_handler;
324 x->rtimer.data = (unsigned long)x;
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;
330 x->replay_maxage = 0;
331 x->replay_maxdiff = 0;
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);
343 hlist_add_head(&x->bydst, &xfrm_state_gc_list);
344 spin_unlock_bh(&xfrm_state_gc_lock);
345 schedule_work(&xfrm_state_gc_work);
346 }
347 EXPORT_SYMBOL(__xfrm_state_destroy);
348
349 int __xfrm_state_delete(struct xfrm_state *x)
350 {
351 int err = -ESRCH;
352
353 if (x->km.state != XFRM_STATE_DEAD) {
354 x->km.state = XFRM_STATE_DEAD;
355 spin_lock(&xfrm_state_lock);
356 hlist_del(&x->bydst);
357 hlist_del(&x->bysrc);
358 if (x->id.spi)
359 hlist_del(&x->byspi);
360 xfrm_state_num--;
361 spin_unlock(&xfrm_state_lock);
362
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 */
367 __xfrm_state_put(x);
368 err = 0;
369 }
370
371 return err;
372 }
373 EXPORT_SYMBOL(__xfrm_state_delete);
374
375 int xfrm_state_delete(struct xfrm_state *x)
376 {
377 int err;
378
379 spin_lock_bh(&x->lock);
380 err = __xfrm_state_delete(x);
381 spin_unlock_bh(&x->lock);
382
383 return err;
384 }
385 EXPORT_SYMBOL(xfrm_state_delete);
386
387 void xfrm_state_flush(u8 proto)
388 {
389 int i;
390
391 spin_lock_bh(&xfrm_state_lock);
392 for (i = 0; i <= xfrm_state_hmask; i++) {
393 struct hlist_node *entry;
394 struct xfrm_state *x;
395 restart:
396 hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {
397 if (!xfrm_state_kern(x) &&
398 xfrm_id_proto_match(x->id.proto, proto)) {
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
429 static struct xfrm_state *__xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
430 {
431 unsigned int h = xfrm_spi_hash(daddr, spi, proto, family);
432 struct xfrm_state *x;
433 struct hlist_node *entry;
434
435 hlist_for_each_entry(x, entry, xfrm_state_byspi+h, byspi) {
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 {
463 unsigned int h = xfrm_src_hash(daddr, saddr, family);
464 struct xfrm_state *x;
465 struct hlist_node *entry;
466
467 hlist_for_each_entry(x, entry, xfrm_state_bysrc+h, bysrc) {
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
508 struct xfrm_state *
509 xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
510 struct flowi *fl, struct xfrm_tmpl *tmpl,
511 struct xfrm_policy *pol, int *err,
512 unsigned short family)
513 {
514 unsigned int h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family);
515 struct hlist_node *entry;
516 struct xfrm_state *x, *x0;
517 int acquire_in_progress = 0;
518 int error = 0;
519 struct xfrm_state *best = NULL;
520
521 spin_lock_bh(&xfrm_state_lock);
522 hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) {
523 if (x->props.family == family &&
524 x->props.reqid == tmpl->reqid &&
525 !(x->props.flags & XFRM_STATE_WILDRECV) &&
526 xfrm_state_addr_check(x, daddr, saddr, family) &&
527 tmpl->mode == x->props.mode &&
528 tmpl->id.proto == x->id.proto &&
529 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) {
530 /* Resolution logic:
531 1. There is a valid state with matching selector.
532 Done.
533 2. Valid state with inappropriate selector. Skip.
534
535 Entering area of "sysdeps".
536
537 3. If state is not valid, selector is temporary,
538 it selects only session which triggered
539 previous resolution. Key manager will do
540 something to install a state with proper
541 selector.
542 */
543 if (x->km.state == XFRM_STATE_VALID) {
544 if (!xfrm_selector_match(&x->sel, fl, family) ||
545 !security_xfrm_state_pol_flow_match(x, pol, fl))
546 continue;
547 if (!best ||
548 best->km.dying > x->km.dying ||
549 (best->km.dying == x->km.dying &&
550 best->curlft.add_time < x->curlft.add_time))
551 best = x;
552 } else if (x->km.state == XFRM_STATE_ACQ) {
553 acquire_in_progress = 1;
554 } else if (x->km.state == XFRM_STATE_ERROR ||
555 x->km.state == XFRM_STATE_EXPIRED) {
556 if (xfrm_selector_match(&x->sel, fl, family) &&
557 security_xfrm_state_pol_flow_match(x, pol, fl))
558 error = -ESRCH;
559 }
560 }
561 }
562
563 x = best;
564 if (!x && !error && !acquire_in_progress) {
565 if (tmpl->id.spi &&
566 (x0 = __xfrm_state_lookup(daddr, tmpl->id.spi,
567 tmpl->id.proto, family)) != NULL) {
568 xfrm_state_put(x0);
569 error = -EEXIST;
570 goto out;
571 }
572 x = xfrm_state_alloc();
573 if (x == NULL) {
574 error = -ENOMEM;
575 goto out;
576 }
577 /* Initialize temporary selector matching only
578 * to current session. */
579 xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family);
580
581 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid);
582 if (error) {
583 x->km.state = XFRM_STATE_DEAD;
584 xfrm_state_put(x);
585 x = NULL;
586 goto out;
587 }
588
589 if (km_query(x, tmpl, pol) == 0) {
590 x->km.state = XFRM_STATE_ACQ;
591 hlist_add_head(&x->bydst, xfrm_state_bydst+h);
592 h = xfrm_src_hash(daddr, saddr, family);
593 hlist_add_head(&x->bysrc, xfrm_state_bysrc+h);
594 if (x->id.spi) {
595 h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family);
596 hlist_add_head(&x->byspi, xfrm_state_byspi+h);
597 }
598 x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
599 x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
600 add_timer(&x->timer);
601 } else {
602 x->km.state = XFRM_STATE_DEAD;
603 xfrm_state_put(x);
604 x = NULL;
605 error = -ESRCH;
606 }
607 }
608 out:
609 if (x)
610 xfrm_state_hold(x);
611 else
612 *err = acquire_in_progress ? -EAGAIN : error;
613 spin_unlock_bh(&xfrm_state_lock);
614 return x;
615 }
616
617 static void xfrm_hash_grow_check(int have_hash_collision)
618 {
619 if (have_hash_collision &&
620 (xfrm_state_hmask + 1) < xfrm_state_hashmax &&
621 xfrm_state_num > xfrm_state_hmask)
622 schedule_work(&xfrm_hash_work);
623 }
624
625 static void __xfrm_state_insert(struct xfrm_state *x)
626 {
627 unsigned int h;
628
629 x->genid = ++xfrm_state_genid;
630
631 h = xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
632 x->props.reqid, x->props.family);
633 hlist_add_head(&x->bydst, xfrm_state_bydst+h);
634
635 h = xfrm_src_hash(&x->id.daddr, &x->props.saddr, x->props.family);
636 hlist_add_head(&x->bysrc, xfrm_state_bysrc+h);
637
638 if (x->id.spi) {
639 h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto,
640 x->props.family);
641
642 hlist_add_head(&x->byspi, xfrm_state_byspi+h);
643 }
644
645 mod_timer(&x->timer, jiffies + HZ);
646 if (x->replay_maxage)
647 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
648
649 wake_up(&km_waitq);
650
651 xfrm_state_num++;
652
653 xfrm_hash_grow_check(x->bydst.next != NULL);
654 }
655
656 /* xfrm_state_lock is held */
657 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
658 {
659 unsigned short family = xnew->props.family;
660 u32 reqid = xnew->props.reqid;
661 struct xfrm_state *x;
662 struct hlist_node *entry;
663 unsigned int h;
664
665 h = xfrm_dst_hash(&xnew->id.daddr, &xnew->props.saddr, reqid, family);
666 hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) {
667 if (x->props.family == family &&
668 x->props.reqid == reqid &&
669 !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
670 !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
671 x->genid = xfrm_state_genid;
672 }
673 }
674
675 void xfrm_state_insert(struct xfrm_state *x)
676 {
677 spin_lock_bh(&xfrm_state_lock);
678 __xfrm_state_bump_genids(x);
679 __xfrm_state_insert(x);
680 spin_unlock_bh(&xfrm_state_lock);
681 }
682 EXPORT_SYMBOL(xfrm_state_insert);
683
684 /* xfrm_state_lock is held */
685 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)
686 {
687 unsigned int h = xfrm_dst_hash(daddr, saddr, reqid, family);
688 struct hlist_node *entry;
689 struct xfrm_state *x;
690
691 hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) {
692 if (x->props.reqid != reqid ||
693 x->props.mode != mode ||
694 x->props.family != family ||
695 x->km.state != XFRM_STATE_ACQ ||
696 x->id.spi != 0)
697 continue;
698
699 switch (family) {
700 case AF_INET:
701 if (x->id.daddr.a4 != daddr->a4 ||
702 x->props.saddr.a4 != saddr->a4)
703 continue;
704 break;
705 case AF_INET6:
706 if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6,
707 (struct in6_addr *)daddr) ||
708 !ipv6_addr_equal((struct in6_addr *)
709 x->props.saddr.a6,
710 (struct in6_addr *)saddr))
711 continue;
712 break;
713 };
714
715 xfrm_state_hold(x);
716 return x;
717 }
718
719 if (!create)
720 return NULL;
721
722 x = xfrm_state_alloc();
723 if (likely(x)) {
724 switch (family) {
725 case AF_INET:
726 x->sel.daddr.a4 = daddr->a4;
727 x->sel.saddr.a4 = saddr->a4;
728 x->sel.prefixlen_d = 32;
729 x->sel.prefixlen_s = 32;
730 x->props.saddr.a4 = saddr->a4;
731 x->id.daddr.a4 = daddr->a4;
732 break;
733
734 case AF_INET6:
735 ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6,
736 (struct in6_addr *)daddr);
737 ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6,
738 (struct in6_addr *)saddr);
739 x->sel.prefixlen_d = 128;
740 x->sel.prefixlen_s = 128;
741 ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6,
742 (struct in6_addr *)saddr);
743 ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6,
744 (struct in6_addr *)daddr);
745 break;
746 };
747
748 x->km.state = XFRM_STATE_ACQ;
749 x->id.proto = proto;
750 x->props.family = family;
751 x->props.mode = mode;
752 x->props.reqid = reqid;
753 x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
754 xfrm_state_hold(x);
755 x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
756 add_timer(&x->timer);
757 hlist_add_head(&x->bydst, xfrm_state_bydst+h);
758 h = xfrm_src_hash(daddr, saddr, family);
759 hlist_add_head(&x->bysrc, xfrm_state_bysrc+h);
760 wake_up(&km_waitq);
761
762 xfrm_state_num++;
763
764 xfrm_hash_grow_check(x->bydst.next != NULL);
765 }
766
767 return x;
768 }
769
770 static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq);
771
772 int xfrm_state_add(struct xfrm_state *x)
773 {
774 struct xfrm_state *x1;
775 int family;
776 int err;
777 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
778
779 family = x->props.family;
780
781 spin_lock_bh(&xfrm_state_lock);
782
783 x1 = __xfrm_state_locate(x, use_spi, family);
784 if (x1) {
785 xfrm_state_put(x1);
786 x1 = NULL;
787 err = -EEXIST;
788 goto out;
789 }
790
791 if (use_spi && x->km.seq) {
792 x1 = __xfrm_find_acq_byseq(x->km.seq);
793 if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) {
794 xfrm_state_put(x1);
795 x1 = NULL;
796 }
797 }
798
799 if (use_spi && !x1)
800 x1 = __find_acq_core(family, x->props.mode, x->props.reqid,
801 x->id.proto,
802 &x->id.daddr, &x->props.saddr, 0);
803
804 __xfrm_state_bump_genids(x);
805 __xfrm_state_insert(x);
806 err = 0;
807
808 out:
809 spin_unlock_bh(&xfrm_state_lock);
810
811 if (x1) {
812 xfrm_state_delete(x1);
813 xfrm_state_put(x1);
814 }
815
816 return err;
817 }
818 EXPORT_SYMBOL(xfrm_state_add);
819
820 int xfrm_state_update(struct xfrm_state *x)
821 {
822 struct xfrm_state *x1;
823 int err;
824 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
825
826 spin_lock_bh(&xfrm_state_lock);
827 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
828
829 err = -ESRCH;
830 if (!x1)
831 goto out;
832
833 if (xfrm_state_kern(x1)) {
834 xfrm_state_put(x1);
835 err = -EEXIST;
836 goto out;
837 }
838
839 if (x1->km.state == XFRM_STATE_ACQ) {
840 __xfrm_state_insert(x);
841 x = NULL;
842 }
843 err = 0;
844
845 out:
846 spin_unlock_bh(&xfrm_state_lock);
847
848 if (err)
849 return err;
850
851 if (!x) {
852 xfrm_state_delete(x1);
853 xfrm_state_put(x1);
854 return 0;
855 }
856
857 err = -EINVAL;
858 spin_lock_bh(&x1->lock);
859 if (likely(x1->km.state == XFRM_STATE_VALID)) {
860 if (x->encap && x1->encap)
861 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
862 if (x->coaddr && x1->coaddr) {
863 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
864 }
865 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
866 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
867 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
868 x1->km.dying = 0;
869
870 mod_timer(&x1->timer, jiffies + HZ);
871 if (x1->curlft.use_time)
872 xfrm_state_check_expire(x1);
873
874 err = 0;
875 }
876 spin_unlock_bh(&x1->lock);
877
878 xfrm_state_put(x1);
879
880 return err;
881 }
882 EXPORT_SYMBOL(xfrm_state_update);
883
884 int xfrm_state_check_expire(struct xfrm_state *x)
885 {
886 if (!x->curlft.use_time)
887 x->curlft.use_time = (unsigned long)xtime.tv_sec;
888
889 if (x->km.state != XFRM_STATE_VALID)
890 return -EINVAL;
891
892 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
893 x->curlft.packets >= x->lft.hard_packet_limit) {
894 x->km.state = XFRM_STATE_EXPIRED;
895 mod_timer(&x->timer, jiffies);
896 return -EINVAL;
897 }
898
899 if (!x->km.dying &&
900 (x->curlft.bytes >= x->lft.soft_byte_limit ||
901 x->curlft.packets >= x->lft.soft_packet_limit)) {
902 x->km.dying = 1;
903 km_state_expired(x, 0, 0);
904 }
905 return 0;
906 }
907 EXPORT_SYMBOL(xfrm_state_check_expire);
908
909 static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb)
910 {
911 int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev)
912 - skb_headroom(skb);
913
914 if (nhead > 0)
915 return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
916
917 /* Check tail too... */
918 return 0;
919 }
920
921 int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb)
922 {
923 int err = xfrm_state_check_expire(x);
924 if (err < 0)
925 goto err;
926 err = xfrm_state_check_space(x, skb);
927 err:
928 return err;
929 }
930 EXPORT_SYMBOL(xfrm_state_check);
931
932 struct xfrm_state *
933 xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto,
934 unsigned short family)
935 {
936 struct xfrm_state *x;
937
938 spin_lock_bh(&xfrm_state_lock);
939 x = __xfrm_state_lookup(daddr, spi, proto, family);
940 spin_unlock_bh(&xfrm_state_lock);
941 return x;
942 }
943 EXPORT_SYMBOL(xfrm_state_lookup);
944
945 struct xfrm_state *
946 xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr,
947 u8 proto, unsigned short family)
948 {
949 struct xfrm_state *x;
950
951 spin_lock_bh(&xfrm_state_lock);
952 x = __xfrm_state_lookup_byaddr(daddr, saddr, proto, family);
953 spin_unlock_bh(&xfrm_state_lock);
954 return x;
955 }
956 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
957
958 struct xfrm_state *
959 xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
960 xfrm_address_t *daddr, xfrm_address_t *saddr,
961 int create, unsigned short family)
962 {
963 struct xfrm_state *x;
964
965 spin_lock_bh(&xfrm_state_lock);
966 x = __find_acq_core(family, mode, reqid, proto, daddr, saddr, create);
967 spin_unlock_bh(&xfrm_state_lock);
968
969 return x;
970 }
971 EXPORT_SYMBOL(xfrm_find_acq);
972
973 #ifdef CONFIG_XFRM_SUB_POLICY
974 int
975 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
976 unsigned short family)
977 {
978 int err = 0;
979 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
980 if (!afinfo)
981 return -EAFNOSUPPORT;
982
983 spin_lock_bh(&xfrm_state_lock);
984 if (afinfo->tmpl_sort)
985 err = afinfo->tmpl_sort(dst, src, n);
986 spin_unlock_bh(&xfrm_state_lock);
987 xfrm_state_put_afinfo(afinfo);
988 return err;
989 }
990 EXPORT_SYMBOL(xfrm_tmpl_sort);
991
992 int
993 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
994 unsigned short family)
995 {
996 int err = 0;
997 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
998 if (!afinfo)
999 return -EAFNOSUPPORT;
1000
1001 spin_lock_bh(&xfrm_state_lock);
1002 if (afinfo->state_sort)
1003 err = afinfo->state_sort(dst, src, n);
1004 spin_unlock_bh(&xfrm_state_lock);
1005 xfrm_state_put_afinfo(afinfo);
1006 return err;
1007 }
1008 EXPORT_SYMBOL(xfrm_state_sort);
1009 #endif
1010
1011 /* Silly enough, but I'm lazy to build resolution list */
1012
1013 static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq)
1014 {
1015 int i;
1016
1017 for (i = 0; i <= xfrm_state_hmask; i++) {
1018 struct hlist_node *entry;
1019 struct xfrm_state *x;
1020
1021 hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {
1022 if (x->km.seq == seq &&
1023 x->km.state == XFRM_STATE_ACQ) {
1024 xfrm_state_hold(x);
1025 return x;
1026 }
1027 }
1028 }
1029 return NULL;
1030 }
1031
1032 struct xfrm_state *xfrm_find_acq_byseq(u32 seq)
1033 {
1034 struct xfrm_state *x;
1035
1036 spin_lock_bh(&xfrm_state_lock);
1037 x = __xfrm_find_acq_byseq(seq);
1038 spin_unlock_bh(&xfrm_state_lock);
1039 return x;
1040 }
1041 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1042
1043 u32 xfrm_get_acqseq(void)
1044 {
1045 u32 res;
1046 static u32 acqseq;
1047 static DEFINE_SPINLOCK(acqseq_lock);
1048
1049 spin_lock_bh(&acqseq_lock);
1050 res = (++acqseq ? : ++acqseq);
1051 spin_unlock_bh(&acqseq_lock);
1052 return res;
1053 }
1054 EXPORT_SYMBOL(xfrm_get_acqseq);
1055
1056 void
1057 xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi)
1058 {
1059 unsigned int h;
1060 struct xfrm_state *x0;
1061
1062 if (x->id.spi)
1063 return;
1064
1065 if (minspi == maxspi) {
1066 x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family);
1067 if (x0) {
1068 xfrm_state_put(x0);
1069 return;
1070 }
1071 x->id.spi = minspi;
1072 } else {
1073 u32 spi = 0;
1074 u32 low = ntohl(minspi);
1075 u32 high = ntohl(maxspi);
1076 for (h=0; h<high-low+1; h++) {
1077 spi = low + net_random()%(high-low+1);
1078 x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1079 if (x0 == NULL) {
1080 x->id.spi = htonl(spi);
1081 break;
1082 }
1083 xfrm_state_put(x0);
1084 }
1085 }
1086 if (x->id.spi) {
1087 spin_lock_bh(&xfrm_state_lock);
1088 h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1089 hlist_add_head(&x->byspi, xfrm_state_byspi+h);
1090 spin_unlock_bh(&xfrm_state_lock);
1091 wake_up(&km_waitq);
1092 }
1093 }
1094 EXPORT_SYMBOL(xfrm_alloc_spi);
1095
1096 int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*),
1097 void *data)
1098 {
1099 int i;
1100 struct xfrm_state *x;
1101 struct hlist_node *entry;
1102 int count = 0;
1103 int err = 0;
1104
1105 spin_lock_bh(&xfrm_state_lock);
1106 for (i = 0; i <= xfrm_state_hmask; i++) {
1107 hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {
1108 if (xfrm_id_proto_match(x->id.proto, proto))
1109 count++;
1110 }
1111 }
1112 if (count == 0) {
1113 err = -ENOENT;
1114 goto out;
1115 }
1116
1117 for (i = 0; i <= xfrm_state_hmask; i++) {
1118 hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {
1119 if (!xfrm_id_proto_match(x->id.proto, proto))
1120 continue;
1121 err = func(x, --count, data);
1122 if (err)
1123 goto out;
1124 }
1125 }
1126 out:
1127 spin_unlock_bh(&xfrm_state_lock);
1128 return err;
1129 }
1130 EXPORT_SYMBOL(xfrm_state_walk);
1131
1132
1133 void xfrm_replay_notify(struct xfrm_state *x, int event)
1134 {
1135 struct km_event c;
1136 /* we send notify messages in case
1137 * 1. we updated on of the sequence numbers, and the seqno difference
1138 * is at least x->replay_maxdiff, in this case we also update the
1139 * timeout of our timer function
1140 * 2. if x->replay_maxage has elapsed since last update,
1141 * and there were changes
1142 *
1143 * The state structure must be locked!
1144 */
1145
1146 switch (event) {
1147 case XFRM_REPLAY_UPDATE:
1148 if (x->replay_maxdiff &&
1149 (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
1150 (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) {
1151 if (x->xflags & XFRM_TIME_DEFER)
1152 event = XFRM_REPLAY_TIMEOUT;
1153 else
1154 return;
1155 }
1156
1157 break;
1158
1159 case XFRM_REPLAY_TIMEOUT:
1160 if ((x->replay.seq == x->preplay.seq) &&
1161 (x->replay.bitmap == x->preplay.bitmap) &&
1162 (x->replay.oseq == x->preplay.oseq)) {
1163 x->xflags |= XFRM_TIME_DEFER;
1164 return;
1165 }
1166
1167 break;
1168 }
1169
1170 memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
1171 c.event = XFRM_MSG_NEWAE;
1172 c.data.aevent = event;
1173 km_state_notify(x, &c);
1174
1175 if (x->replay_maxage &&
1176 !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
1177 x->xflags &= ~XFRM_TIME_DEFER;
1178 }
1179 EXPORT_SYMBOL(xfrm_replay_notify);
1180
1181 static void xfrm_replay_timer_handler(unsigned long data)
1182 {
1183 struct xfrm_state *x = (struct xfrm_state*)data;
1184
1185 spin_lock(&x->lock);
1186
1187 if (x->km.state == XFRM_STATE_VALID) {
1188 if (xfrm_aevent_is_on())
1189 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
1190 else
1191 x->xflags |= XFRM_TIME_DEFER;
1192 }
1193
1194 spin_unlock(&x->lock);
1195 }
1196
1197 int xfrm_replay_check(struct xfrm_state *x, __be32 net_seq)
1198 {
1199 u32 diff;
1200 u32 seq = ntohl(net_seq);
1201
1202 if (unlikely(seq == 0))
1203 return -EINVAL;
1204
1205 if (likely(seq > x->replay.seq))
1206 return 0;
1207
1208 diff = x->replay.seq - seq;
1209 if (diff >= x->props.replay_window) {
1210 x->stats.replay_window++;
1211 return -EINVAL;
1212 }
1213
1214 if (x->replay.bitmap & (1U << diff)) {
1215 x->stats.replay++;
1216 return -EINVAL;
1217 }
1218 return 0;
1219 }
1220 EXPORT_SYMBOL(xfrm_replay_check);
1221
1222 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq)
1223 {
1224 u32 diff;
1225 u32 seq = ntohl(net_seq);
1226
1227 if (seq > x->replay.seq) {
1228 diff = seq - x->replay.seq;
1229 if (diff < x->props.replay_window)
1230 x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
1231 else
1232 x->replay.bitmap = 1;
1233 x->replay.seq = seq;
1234 } else {
1235 diff = x->replay.seq - seq;
1236 x->replay.bitmap |= (1U << diff);
1237 }
1238
1239 if (xfrm_aevent_is_on())
1240 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1241 }
1242 EXPORT_SYMBOL(xfrm_replay_advance);
1243
1244 static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list);
1245 static DEFINE_RWLOCK(xfrm_km_lock);
1246
1247 void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1248 {
1249 struct xfrm_mgr *km;
1250
1251 read_lock(&xfrm_km_lock);
1252 list_for_each_entry(km, &xfrm_km_list, list)
1253 if (km->notify_policy)
1254 km->notify_policy(xp, dir, c);
1255 read_unlock(&xfrm_km_lock);
1256 }
1257
1258 void km_state_notify(struct xfrm_state *x, struct km_event *c)
1259 {
1260 struct xfrm_mgr *km;
1261 read_lock(&xfrm_km_lock);
1262 list_for_each_entry(km, &xfrm_km_list, list)
1263 if (km->notify)
1264 km->notify(x, c);
1265 read_unlock(&xfrm_km_lock);
1266 }
1267
1268 EXPORT_SYMBOL(km_policy_notify);
1269 EXPORT_SYMBOL(km_state_notify);
1270
1271 void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
1272 {
1273 struct km_event c;
1274
1275 c.data.hard = hard;
1276 c.pid = pid;
1277 c.event = XFRM_MSG_EXPIRE;
1278 km_state_notify(x, &c);
1279
1280 if (hard)
1281 wake_up(&km_waitq);
1282 }
1283
1284 EXPORT_SYMBOL(km_state_expired);
1285 /*
1286 * We send to all registered managers regardless of failure
1287 * We are happy with one success
1288 */
1289 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1290 {
1291 int err = -EINVAL, acqret;
1292 struct xfrm_mgr *km;
1293
1294 read_lock(&xfrm_km_lock);
1295 list_for_each_entry(km, &xfrm_km_list, list) {
1296 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT);
1297 if (!acqret)
1298 err = acqret;
1299 }
1300 read_unlock(&xfrm_km_lock);
1301 return err;
1302 }
1303 EXPORT_SYMBOL(km_query);
1304
1305 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport)
1306 {
1307 int err = -EINVAL;
1308 struct xfrm_mgr *km;
1309
1310 read_lock(&xfrm_km_lock);
1311 list_for_each_entry(km, &xfrm_km_list, list) {
1312 if (km->new_mapping)
1313 err = km->new_mapping(x, ipaddr, sport);
1314 if (!err)
1315 break;
1316 }
1317 read_unlock(&xfrm_km_lock);
1318 return err;
1319 }
1320 EXPORT_SYMBOL(km_new_mapping);
1321
1322 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
1323 {
1324 struct km_event c;
1325
1326 c.data.hard = hard;
1327 c.pid = pid;
1328 c.event = XFRM_MSG_POLEXPIRE;
1329 km_policy_notify(pol, dir, &c);
1330
1331 if (hard)
1332 wake_up(&km_waitq);
1333 }
1334 EXPORT_SYMBOL(km_policy_expired);
1335
1336 int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1337 {
1338 int err = -EINVAL;
1339 int ret;
1340 struct xfrm_mgr *km;
1341
1342 read_lock(&xfrm_km_lock);
1343 list_for_each_entry(km, &xfrm_km_list, list) {
1344 if (km->report) {
1345 ret = km->report(proto, sel, addr);
1346 if (!ret)
1347 err = ret;
1348 }
1349 }
1350 read_unlock(&xfrm_km_lock);
1351 return err;
1352 }
1353 EXPORT_SYMBOL(km_report);
1354
1355 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1356 {
1357 int err;
1358 u8 *data;
1359 struct xfrm_mgr *km;
1360 struct xfrm_policy *pol = NULL;
1361
1362 if (optlen <= 0 || optlen > PAGE_SIZE)
1363 return -EMSGSIZE;
1364
1365 data = kmalloc(optlen, GFP_KERNEL);
1366 if (!data)
1367 return -ENOMEM;
1368
1369 err = -EFAULT;
1370 if (copy_from_user(data, optval, optlen))
1371 goto out;
1372
1373 err = -EINVAL;
1374 read_lock(&xfrm_km_lock);
1375 list_for_each_entry(km, &xfrm_km_list, list) {
1376 pol = km->compile_policy(sk, optname, data,
1377 optlen, &err);
1378 if (err >= 0)
1379 break;
1380 }
1381 read_unlock(&xfrm_km_lock);
1382
1383 if (err >= 0) {
1384 xfrm_sk_policy_insert(sk, err, pol);
1385 xfrm_pol_put(pol);
1386 err = 0;
1387 }
1388
1389 out:
1390 kfree(data);
1391 return err;
1392 }
1393 EXPORT_SYMBOL(xfrm_user_policy);
1394
1395 int xfrm_register_km(struct xfrm_mgr *km)
1396 {
1397 write_lock_bh(&xfrm_km_lock);
1398 list_add_tail(&km->list, &xfrm_km_list);
1399 write_unlock_bh(&xfrm_km_lock);
1400 return 0;
1401 }
1402 EXPORT_SYMBOL(xfrm_register_km);
1403
1404 int xfrm_unregister_km(struct xfrm_mgr *km)
1405 {
1406 write_lock_bh(&xfrm_km_lock);
1407 list_del(&km->list);
1408 write_unlock_bh(&xfrm_km_lock);
1409 return 0;
1410 }
1411 EXPORT_SYMBOL(xfrm_unregister_km);
1412
1413 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1414 {
1415 int err = 0;
1416 if (unlikely(afinfo == NULL))
1417 return -EINVAL;
1418 if (unlikely(afinfo->family >= NPROTO))
1419 return -EAFNOSUPPORT;
1420 write_lock_bh(&xfrm_state_afinfo_lock);
1421 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1422 err = -ENOBUFS;
1423 else
1424 xfrm_state_afinfo[afinfo->family] = afinfo;
1425 write_unlock_bh(&xfrm_state_afinfo_lock);
1426 return err;
1427 }
1428 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1429
1430 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1431 {
1432 int err = 0;
1433 if (unlikely(afinfo == NULL))
1434 return -EINVAL;
1435 if (unlikely(afinfo->family >= NPROTO))
1436 return -EAFNOSUPPORT;
1437 write_lock_bh(&xfrm_state_afinfo_lock);
1438 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1439 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1440 err = -EINVAL;
1441 else
1442 xfrm_state_afinfo[afinfo->family] = NULL;
1443 }
1444 write_unlock_bh(&xfrm_state_afinfo_lock);
1445 return err;
1446 }
1447 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1448
1449 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family)
1450 {
1451 struct xfrm_state_afinfo *afinfo;
1452 if (unlikely(family >= NPROTO))
1453 return NULL;
1454 read_lock(&xfrm_state_afinfo_lock);
1455 afinfo = xfrm_state_afinfo[family];
1456 if (unlikely(!afinfo))
1457 read_unlock(&xfrm_state_afinfo_lock);
1458 return afinfo;
1459 }
1460
1461 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1462 {
1463 read_unlock(&xfrm_state_afinfo_lock);
1464 }
1465
1466 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1467 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1468 {
1469 if (x->tunnel) {
1470 struct xfrm_state *t = x->tunnel;
1471
1472 if (atomic_read(&t->tunnel_users) == 2)
1473 xfrm_state_delete(t);
1474 atomic_dec(&t->tunnel_users);
1475 xfrm_state_put(t);
1476 x->tunnel = NULL;
1477 }
1478 }
1479 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1480
1481 /*
1482 * This function is NOT optimal. For example, with ESP it will give an
1483 * MTU that's usually two bytes short of being optimal. However, it will
1484 * usually give an answer that's a multiple of 4 provided the input is
1485 * also a multiple of 4.
1486 */
1487 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1488 {
1489 int res = mtu;
1490
1491 res -= x->props.header_len;
1492
1493 for (;;) {
1494 int m = res;
1495
1496 if (m < 68)
1497 return 68;
1498
1499 spin_lock_bh(&x->lock);
1500 if (x->km.state == XFRM_STATE_VALID &&
1501 x->type && x->type->get_max_size)
1502 m = x->type->get_max_size(x, m);
1503 else
1504 m += x->props.header_len;
1505 spin_unlock_bh(&x->lock);
1506
1507 if (m <= mtu)
1508 break;
1509 res -= (m - mtu);
1510 }
1511
1512 return res;
1513 }
1514
1515 int xfrm_init_state(struct xfrm_state *x)
1516 {
1517 struct xfrm_state_afinfo *afinfo;
1518 int family = x->props.family;
1519 int err;
1520
1521 err = -EAFNOSUPPORT;
1522 afinfo = xfrm_state_get_afinfo(family);
1523 if (!afinfo)
1524 goto error;
1525
1526 err = 0;
1527 if (afinfo->init_flags)
1528 err = afinfo->init_flags(x);
1529
1530 xfrm_state_put_afinfo(afinfo);
1531
1532 if (err)
1533 goto error;
1534
1535 err = -EPROTONOSUPPORT;
1536 x->type = xfrm_get_type(x->id.proto, family);
1537 if (x->type == NULL)
1538 goto error;
1539
1540 err = x->type->init_state(x);
1541 if (err)
1542 goto error;
1543
1544 x->mode = xfrm_get_mode(x->props.mode, family);
1545 if (x->mode == NULL)
1546 goto error;
1547
1548 x->km.state = XFRM_STATE_VALID;
1549
1550 error:
1551 return err;
1552 }
1553
1554 EXPORT_SYMBOL(xfrm_init_state);
1555
1556 void __init xfrm_state_init(void)
1557 {
1558 unsigned int sz;
1559
1560 sz = sizeof(struct hlist_head) * 8;
1561
1562 xfrm_state_bydst = xfrm_hash_alloc(sz);
1563 xfrm_state_bysrc = xfrm_hash_alloc(sz);
1564 xfrm_state_byspi = xfrm_hash_alloc(sz);
1565 if (!xfrm_state_bydst || !xfrm_state_bysrc || !xfrm_state_byspi)
1566 panic("XFRM: Cannot allocate bydst/bysrc/byspi hashes.");
1567 xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
1568
1569 INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task, NULL);
1570 }
1571
Linux kernel - Deliverables
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