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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-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(struct work_struct *__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);
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(struct work_struct *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 static void xfrm_hash_grow_check(int have_hash_collision)
509 {
510 if (have_hash_collision &&
511 (xfrm_state_hmask + 1) < xfrm_state_hashmax &&
512 xfrm_state_num > xfrm_state_hmask)
513 schedule_work(&xfrm_hash_work);
514 }
515
516 struct xfrm_state *
517 xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
518 struct flowi *fl, struct xfrm_tmpl *tmpl,
519 struct xfrm_policy *pol, int *err,
520 unsigned short family)
521 {
522 unsigned int h = xfrm_dst_hash(daddr, saddr, tmpl->reqid, family);
523 struct hlist_node *entry;
524 struct xfrm_state *x, *x0;
525 int acquire_in_progress = 0;
526 int error = 0;
527 struct xfrm_state *best = NULL;
528
529 spin_lock_bh(&xfrm_state_lock);
530 hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) {
531 if (x->props.family == family &&
532 x->props.reqid == tmpl->reqid &&
533 !(x->props.flags & XFRM_STATE_WILDRECV) &&
534 xfrm_state_addr_check(x, daddr, saddr, family) &&
535 tmpl->mode == x->props.mode &&
536 tmpl->id.proto == x->id.proto &&
537 (tmpl->id.spi == x->id.spi || !tmpl->id.spi)) {
538 /* Resolution logic:
539 1. There is a valid state with matching selector.
540 Done.
541 2. Valid state with inappropriate selector. Skip.
542
543 Entering area of "sysdeps".
544
545 3. If state is not valid, selector is temporary,
546 it selects only session which triggered
547 previous resolution. Key manager will do
548 something to install a state with proper
549 selector.
550 */
551 if (x->km.state == XFRM_STATE_VALID) {
552 if (!xfrm_selector_match(&x->sel, fl, family) ||
553 !security_xfrm_state_pol_flow_match(x, pol, fl))
554 continue;
555 if (!best ||
556 best->km.dying > x->km.dying ||
557 (best->km.dying == x->km.dying &&
558 best->curlft.add_time < x->curlft.add_time))
559 best = x;
560 } else if (x->km.state == XFRM_STATE_ACQ) {
561 acquire_in_progress = 1;
562 } else if (x->km.state == XFRM_STATE_ERROR ||
563 x->km.state == XFRM_STATE_EXPIRED) {
564 if (xfrm_selector_match(&x->sel, fl, family) &&
565 security_xfrm_state_pol_flow_match(x, pol, fl))
566 error = -ESRCH;
567 }
568 }
569 }
570
571 x = best;
572 if (!x && !error && !acquire_in_progress) {
573 if (tmpl->id.spi &&
574 (x0 = __xfrm_state_lookup(daddr, tmpl->id.spi,
575 tmpl->id.proto, family)) != NULL) {
576 xfrm_state_put(x0);
577 error = -EEXIST;
578 goto out;
579 }
580 x = xfrm_state_alloc();
581 if (x == NULL) {
582 error = -ENOMEM;
583 goto out;
584 }
585 /* Initialize temporary selector matching only
586 * to current session. */
587 xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family);
588
589 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid);
590 if (error) {
591 x->km.state = XFRM_STATE_DEAD;
592 xfrm_state_put(x);
593 x = NULL;
594 goto out;
595 }
596
597 if (km_query(x, tmpl, pol) == 0) {
598 x->km.state = XFRM_STATE_ACQ;
599 hlist_add_head(&x->bydst, xfrm_state_bydst+h);
600 h = xfrm_src_hash(daddr, saddr, family);
601 hlist_add_head(&x->bysrc, xfrm_state_bysrc+h);
602 if (x->id.spi) {
603 h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, family);
604 hlist_add_head(&x->byspi, xfrm_state_byspi+h);
605 }
606 x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
607 x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
608 add_timer(&x->timer);
609 xfrm_state_num++;
610 xfrm_hash_grow_check(x->bydst.next != NULL);
611 } else {
612 x->km.state = XFRM_STATE_DEAD;
613 xfrm_state_put(x);
614 x = NULL;
615 error = -ESRCH;
616 }
617 }
618 out:
619 if (x)
620 xfrm_state_hold(x);
621 else
622 *err = acquire_in_progress ? -EAGAIN : error;
623 spin_unlock_bh(&xfrm_state_lock);
624 return x;
625 }
626
627 static void __xfrm_state_insert(struct xfrm_state *x)
628 {
629 unsigned int h;
630
631 x->genid = ++xfrm_state_genid;
632
633 h = xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
634 x->props.reqid, x->props.family);
635 hlist_add_head(&x->bydst, xfrm_state_bydst+h);
636
637 h = xfrm_src_hash(&x->id.daddr, &x->props.saddr, x->props.family);
638 hlist_add_head(&x->bysrc, xfrm_state_bysrc+h);
639
640 if (x->id.spi) {
641 h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto,
642 x->props.family);
643
644 hlist_add_head(&x->byspi, xfrm_state_byspi+h);
645 }
646
647 mod_timer(&x->timer, jiffies + HZ);
648 if (x->replay_maxage)
649 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
650
651 wake_up(&km_waitq);
652
653 xfrm_state_num++;
654
655 xfrm_hash_grow_check(x->bydst.next != NULL);
656 }
657
658 /* xfrm_state_lock is held */
659 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
660 {
661 unsigned short family = xnew->props.family;
662 u32 reqid = xnew->props.reqid;
663 struct xfrm_state *x;
664 struct hlist_node *entry;
665 unsigned int h;
666
667 h = xfrm_dst_hash(&xnew->id.daddr, &xnew->props.saddr, reqid, family);
668 hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) {
669 if (x->props.family == family &&
670 x->props.reqid == reqid &&
671 !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
672 !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
673 x->genid = xfrm_state_genid;
674 }
675 }
676
677 void xfrm_state_insert(struct xfrm_state *x)
678 {
679 spin_lock_bh(&xfrm_state_lock);
680 __xfrm_state_bump_genids(x);
681 __xfrm_state_insert(x);
682 spin_unlock_bh(&xfrm_state_lock);
683 }
684 EXPORT_SYMBOL(xfrm_state_insert);
685
686 /* xfrm_state_lock is held */
687 static struct xfrm_state *__find_acq_core(unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create)
688 {
689 unsigned int h = xfrm_dst_hash(daddr, saddr, reqid, family);
690 struct hlist_node *entry;
691 struct xfrm_state *x;
692
693 hlist_for_each_entry(x, entry, xfrm_state_bydst+h, bydst) {
694 if (x->props.reqid != reqid ||
695 x->props.mode != mode ||
696 x->props.family != family ||
697 x->km.state != XFRM_STATE_ACQ ||
698 x->id.spi != 0)
699 continue;
700
701 switch (family) {
702 case AF_INET:
703 if (x->id.daddr.a4 != daddr->a4 ||
704 x->props.saddr.a4 != saddr->a4)
705 continue;
706 break;
707 case AF_INET6:
708 if (!ipv6_addr_equal((struct in6_addr *)x->id.daddr.a6,
709 (struct in6_addr *)daddr) ||
710 !ipv6_addr_equal((struct in6_addr *)
711 x->props.saddr.a6,
712 (struct in6_addr *)saddr))
713 continue;
714 break;
715 };
716
717 xfrm_state_hold(x);
718 return x;
719 }
720
721 if (!create)
722 return NULL;
723
724 x = xfrm_state_alloc();
725 if (likely(x)) {
726 switch (family) {
727 case AF_INET:
728 x->sel.daddr.a4 = daddr->a4;
729 x->sel.saddr.a4 = saddr->a4;
730 x->sel.prefixlen_d = 32;
731 x->sel.prefixlen_s = 32;
732 x->props.saddr.a4 = saddr->a4;
733 x->id.daddr.a4 = daddr->a4;
734 break;
735
736 case AF_INET6:
737 ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6,
738 (struct in6_addr *)daddr);
739 ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6,
740 (struct in6_addr *)saddr);
741 x->sel.prefixlen_d = 128;
742 x->sel.prefixlen_s = 128;
743 ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6,
744 (struct in6_addr *)saddr);
745 ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6,
746 (struct in6_addr *)daddr);
747 break;
748 };
749
750 x->km.state = XFRM_STATE_ACQ;
751 x->id.proto = proto;
752 x->props.family = family;
753 x->props.mode = mode;
754 x->props.reqid = reqid;
755 x->lft.hard_add_expires_seconds = XFRM_ACQ_EXPIRES;
756 xfrm_state_hold(x);
757 x->timer.expires = jiffies + XFRM_ACQ_EXPIRES*HZ;
758 add_timer(&x->timer);
759 hlist_add_head(&x->bydst, xfrm_state_bydst+h);
760 h = xfrm_src_hash(daddr, saddr, family);
761 hlist_add_head(&x->bysrc, xfrm_state_bysrc+h);
762 wake_up(&km_waitq);
763
764 xfrm_state_num++;
765
766 xfrm_hash_grow_check(x->bydst.next != NULL);
767 }
768
769 return x;
770 }
771
772 static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq);
773
774 int xfrm_state_add(struct xfrm_state *x)
775 {
776 struct xfrm_state *x1;
777 int family;
778 int err;
779 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
780
781 family = x->props.family;
782
783 spin_lock_bh(&xfrm_state_lock);
784
785 x1 = __xfrm_state_locate(x, use_spi, family);
786 if (x1) {
787 xfrm_state_put(x1);
788 x1 = NULL;
789 err = -EEXIST;
790 goto out;
791 }
792
793 if (use_spi && x->km.seq) {
794 x1 = __xfrm_find_acq_byseq(x->km.seq);
795 if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) {
796 xfrm_state_put(x1);
797 x1 = NULL;
798 }
799 }
800
801 if (use_spi && !x1)
802 x1 = __find_acq_core(family, x->props.mode, x->props.reqid,
803 x->id.proto,
804 &x->id.daddr, &x->props.saddr, 0);
805
806 __xfrm_state_bump_genids(x);
807 __xfrm_state_insert(x);
808 err = 0;
809
810 out:
811 spin_unlock_bh(&xfrm_state_lock);
812
813 if (x1) {
814 xfrm_state_delete(x1);
815 xfrm_state_put(x1);
816 }
817
818 return err;
819 }
820 EXPORT_SYMBOL(xfrm_state_add);
821
822 int xfrm_state_update(struct xfrm_state *x)
823 {
824 struct xfrm_state *x1;
825 int err;
826 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
827
828 spin_lock_bh(&xfrm_state_lock);
829 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
830
831 err = -ESRCH;
832 if (!x1)
833 goto out;
834
835 if (xfrm_state_kern(x1)) {
836 xfrm_state_put(x1);
837 err = -EEXIST;
838 goto out;
839 }
840
841 if (x1->km.state == XFRM_STATE_ACQ) {
842 __xfrm_state_insert(x);
843 x = NULL;
844 }
845 err = 0;
846
847 out:
848 spin_unlock_bh(&xfrm_state_lock);
849
850 if (err)
851 return err;
852
853 if (!x) {
854 xfrm_state_delete(x1);
855 xfrm_state_put(x1);
856 return 0;
857 }
858
859 err = -EINVAL;
860 spin_lock_bh(&x1->lock);
861 if (likely(x1->km.state == XFRM_STATE_VALID)) {
862 if (x->encap && x1->encap)
863 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
864 if (x->coaddr && x1->coaddr) {
865 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
866 }
867 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
868 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
869 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
870 x1->km.dying = 0;
871
872 mod_timer(&x1->timer, jiffies + HZ);
873 if (x1->curlft.use_time)
874 xfrm_state_check_expire(x1);
875
876 err = 0;
877 }
878 spin_unlock_bh(&x1->lock);
879
880 xfrm_state_put(x1);
881
882 return err;
883 }
884 EXPORT_SYMBOL(xfrm_state_update);
885
886 int xfrm_state_check_expire(struct xfrm_state *x)
887 {
888 if (!x->curlft.use_time)
889 x->curlft.use_time = (unsigned long)xtime.tv_sec;
890
891 if (x->km.state != XFRM_STATE_VALID)
892 return -EINVAL;
893
894 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
895 x->curlft.packets >= x->lft.hard_packet_limit) {
896 x->km.state = XFRM_STATE_EXPIRED;
897 mod_timer(&x->timer, jiffies);
898 return -EINVAL;
899 }
900
901 if (!x->km.dying &&
902 (x->curlft.bytes >= x->lft.soft_byte_limit ||
903 x->curlft.packets >= x->lft.soft_packet_limit)) {
904 x->km.dying = 1;
905 km_state_expired(x, 0, 0);
906 }
907 return 0;
908 }
909 EXPORT_SYMBOL(xfrm_state_check_expire);
910
911 static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb)
912 {
913 int nhead = x->props.header_len + LL_RESERVED_SPACE(skb->dst->dev)
914 - skb_headroom(skb);
915
916 if (nhead > 0)
917 return pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
918
919 /* Check tail too... */
920 return 0;
921 }
922
923 int xfrm_state_check(struct xfrm_state *x, struct sk_buff *skb)
924 {
925 int err = xfrm_state_check_expire(x);
926 if (err < 0)
927 goto err;
928 err = xfrm_state_check_space(x, skb);
929 err:
930 return err;
931 }
932 EXPORT_SYMBOL(xfrm_state_check);
933
934 struct xfrm_state *
935 xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto,
936 unsigned short family)
937 {
938 struct xfrm_state *x;
939
940 spin_lock_bh(&xfrm_state_lock);
941 x = __xfrm_state_lookup(daddr, spi, proto, family);
942 spin_unlock_bh(&xfrm_state_lock);
943 return x;
944 }
945 EXPORT_SYMBOL(xfrm_state_lookup);
946
947 struct xfrm_state *
948 xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr,
949 u8 proto, unsigned short family)
950 {
951 struct xfrm_state *x;
952
953 spin_lock_bh(&xfrm_state_lock);
954 x = __xfrm_state_lookup_byaddr(daddr, saddr, proto, family);
955 spin_unlock_bh(&xfrm_state_lock);
956 return x;
957 }
958 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
959
960 struct xfrm_state *
961 xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
962 xfrm_address_t *daddr, xfrm_address_t *saddr,
963 int create, unsigned short family)
964 {
965 struct xfrm_state *x;
966
967 spin_lock_bh(&xfrm_state_lock);
968 x = __find_acq_core(family, mode, reqid, proto, daddr, saddr, create);
969 spin_unlock_bh(&xfrm_state_lock);
970
971 return x;
972 }
973 EXPORT_SYMBOL(xfrm_find_acq);
974
975 #ifdef CONFIG_XFRM_SUB_POLICY
976 int
977 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
978 unsigned short family)
979 {
980 int err = 0;
981 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
982 if (!afinfo)
983 return -EAFNOSUPPORT;
984
985 spin_lock_bh(&xfrm_state_lock);
986 if (afinfo->tmpl_sort)
987 err = afinfo->tmpl_sort(dst, src, n);
988 spin_unlock_bh(&xfrm_state_lock);
989 xfrm_state_put_afinfo(afinfo);
990 return err;
991 }
992 EXPORT_SYMBOL(xfrm_tmpl_sort);
993
994 int
995 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
996 unsigned short family)
997 {
998 int err = 0;
999 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1000 if (!afinfo)
1001 return -EAFNOSUPPORT;
1002
1003 spin_lock_bh(&xfrm_state_lock);
1004 if (afinfo->state_sort)
1005 err = afinfo->state_sort(dst, src, n);
1006 spin_unlock_bh(&xfrm_state_lock);
1007 xfrm_state_put_afinfo(afinfo);
1008 return err;
1009 }
1010 EXPORT_SYMBOL(xfrm_state_sort);
1011 #endif
1012
1013 /* Silly enough, but I'm lazy to build resolution list */
1014
1015 static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq)
1016 {
1017 int i;
1018
1019 for (i = 0; i <= xfrm_state_hmask; i++) {
1020 struct hlist_node *entry;
1021 struct xfrm_state *x;
1022
1023 hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {
1024 if (x->km.seq == seq &&
1025 x->km.state == XFRM_STATE_ACQ) {
1026 xfrm_state_hold(x);
1027 return x;
1028 }
1029 }
1030 }
1031 return NULL;
1032 }
1033
1034 struct xfrm_state *xfrm_find_acq_byseq(u32 seq)
1035 {
1036 struct xfrm_state *x;
1037
1038 spin_lock_bh(&xfrm_state_lock);
1039 x = __xfrm_find_acq_byseq(seq);
1040 spin_unlock_bh(&xfrm_state_lock);
1041 return x;
1042 }
1043 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1044
1045 u32 xfrm_get_acqseq(void)
1046 {
1047 u32 res;
1048 static u32 acqseq;
1049 static DEFINE_SPINLOCK(acqseq_lock);
1050
1051 spin_lock_bh(&acqseq_lock);
1052 res = (++acqseq ? : ++acqseq);
1053 spin_unlock_bh(&acqseq_lock);
1054 return res;
1055 }
1056 EXPORT_SYMBOL(xfrm_get_acqseq);
1057
1058 void
1059 xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi)
1060 {
1061 unsigned int h;
1062 struct xfrm_state *x0;
1063
1064 if (x->id.spi)
1065 return;
1066
1067 if (minspi == maxspi) {
1068 x0 = xfrm_state_lookup(&x->id.daddr, minspi, x->id.proto, x->props.family);
1069 if (x0) {
1070 xfrm_state_put(x0);
1071 return;
1072 }
1073 x->id.spi = minspi;
1074 } else {
1075 u32 spi = 0;
1076 u32 low = ntohl(minspi);
1077 u32 high = ntohl(maxspi);
1078 for (h=0; h<high-low+1; h++) {
1079 spi = low + net_random()%(high-low+1);
1080 x0 = xfrm_state_lookup(&x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1081 if (x0 == NULL) {
1082 x->id.spi = htonl(spi);
1083 break;
1084 }
1085 xfrm_state_put(x0);
1086 }
1087 }
1088 if (x->id.spi) {
1089 spin_lock_bh(&xfrm_state_lock);
1090 h = xfrm_spi_hash(&x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1091 hlist_add_head(&x->byspi, xfrm_state_byspi+h);
1092 spin_unlock_bh(&xfrm_state_lock);
1093 wake_up(&km_waitq);
1094 }
1095 }
1096 EXPORT_SYMBOL(xfrm_alloc_spi);
1097
1098 int xfrm_state_walk(u8 proto, int (*func)(struct xfrm_state *, int, void*),
1099 void *data)
1100 {
1101 int i;
1102 struct xfrm_state *x;
1103 struct hlist_node *entry;
1104 int count = 0;
1105 int err = 0;
1106
1107 spin_lock_bh(&xfrm_state_lock);
1108 for (i = 0; i <= xfrm_state_hmask; i++) {
1109 hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {
1110 if (xfrm_id_proto_match(x->id.proto, proto))
1111 count++;
1112 }
1113 }
1114 if (count == 0) {
1115 err = -ENOENT;
1116 goto out;
1117 }
1118
1119 for (i = 0; i <= xfrm_state_hmask; i++) {
1120 hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {
1121 if (!xfrm_id_proto_match(x->id.proto, proto))
1122 continue;
1123 err = func(x, --count, data);
1124 if (err)
1125 goto out;
1126 }
1127 }
1128 out:
1129 spin_unlock_bh(&xfrm_state_lock);
1130 return err;
1131 }
1132 EXPORT_SYMBOL(xfrm_state_walk);
1133
1134
1135 void xfrm_replay_notify(struct xfrm_state *x, int event)
1136 {
1137 struct km_event c;
1138 /* we send notify messages in case
1139 * 1. we updated on of the sequence numbers, and the seqno difference
1140 * is at least x->replay_maxdiff, in this case we also update the
1141 * timeout of our timer function
1142 * 2. if x->replay_maxage has elapsed since last update,
1143 * and there were changes
1144 *
1145 * The state structure must be locked!
1146 */
1147
1148 switch (event) {
1149 case XFRM_REPLAY_UPDATE:
1150 if (x->replay_maxdiff &&
1151 (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
1152 (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) {
1153 if (x->xflags & XFRM_TIME_DEFER)
1154 event = XFRM_REPLAY_TIMEOUT;
1155 else
1156 return;
1157 }
1158
1159 break;
1160
1161 case XFRM_REPLAY_TIMEOUT:
1162 if ((x->replay.seq == x->preplay.seq) &&
1163 (x->replay.bitmap == x->preplay.bitmap) &&
1164 (x->replay.oseq == x->preplay.oseq)) {
1165 x->xflags |= XFRM_TIME_DEFER;
1166 return;
1167 }
1168
1169 break;
1170 }
1171
1172 memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
1173 c.event = XFRM_MSG_NEWAE;
1174 c.data.aevent = event;
1175 km_state_notify(x, &c);
1176
1177 if (x->replay_maxage &&
1178 !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
1179 x->xflags &= ~XFRM_TIME_DEFER;
1180 }
1181 EXPORT_SYMBOL(xfrm_replay_notify);
1182
1183 static void xfrm_replay_timer_handler(unsigned long data)
1184 {
1185 struct xfrm_state *x = (struct xfrm_state*)data;
1186
1187 spin_lock(&x->lock);
1188
1189 if (x->km.state == XFRM_STATE_VALID) {
1190 if (xfrm_aevent_is_on())
1191 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
1192 else
1193 x->xflags |= XFRM_TIME_DEFER;
1194 }
1195
1196 spin_unlock(&x->lock);
1197 }
1198
1199 int xfrm_replay_check(struct xfrm_state *x, __be32 net_seq)
1200 {
1201 u32 diff;
1202 u32 seq = ntohl(net_seq);
1203
1204 if (unlikely(seq == 0))
1205 return -EINVAL;
1206
1207 if (likely(seq > x->replay.seq))
1208 return 0;
1209
1210 diff = x->replay.seq - seq;
1211 if (diff >= x->props.replay_window) {
1212 x->stats.replay_window++;
1213 return -EINVAL;
1214 }
1215
1216 if (x->replay.bitmap & (1U << diff)) {
1217 x->stats.replay++;
1218 return -EINVAL;
1219 }
1220 return 0;
1221 }
1222 EXPORT_SYMBOL(xfrm_replay_check);
1223
1224 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq)
1225 {
1226 u32 diff;
1227 u32 seq = ntohl(net_seq);
1228
1229 if (seq > x->replay.seq) {
1230 diff = seq - x->replay.seq;
1231 if (diff < x->props.replay_window)
1232 x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
1233 else
1234 x->replay.bitmap = 1;
1235 x->replay.seq = seq;
1236 } else {
1237 diff = x->replay.seq - seq;
1238 x->replay.bitmap |= (1U << diff);
1239 }
1240
1241 if (xfrm_aevent_is_on())
1242 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1243 }
1244 EXPORT_SYMBOL(xfrm_replay_advance);
1245
1246 static struct list_head xfrm_km_list = LIST_HEAD_INIT(xfrm_km_list);
1247 static DEFINE_RWLOCK(xfrm_km_lock);
1248
1249 void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1250 {
1251 struct xfrm_mgr *km;
1252
1253 read_lock(&xfrm_km_lock);
1254 list_for_each_entry(km, &xfrm_km_list, list)
1255 if (km->notify_policy)
1256 km->notify_policy(xp, dir, c);
1257 read_unlock(&xfrm_km_lock);
1258 }
1259
1260 void km_state_notify(struct xfrm_state *x, struct km_event *c)
1261 {
1262 struct xfrm_mgr *km;
1263 read_lock(&xfrm_km_lock);
1264 list_for_each_entry(km, &xfrm_km_list, list)
1265 if (km->notify)
1266 km->notify(x, c);
1267 read_unlock(&xfrm_km_lock);
1268 }
1269
1270 EXPORT_SYMBOL(km_policy_notify);
1271 EXPORT_SYMBOL(km_state_notify);
1272
1273 void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
1274 {
1275 struct km_event c;
1276
1277 c.data.hard = hard;
1278 c.pid = pid;
1279 c.event = XFRM_MSG_EXPIRE;
1280 km_state_notify(x, &c);
1281
1282 if (hard)
1283 wake_up(&km_waitq);
1284 }
1285
1286 EXPORT_SYMBOL(km_state_expired);
1287 /*
1288 * We send to all registered managers regardless of failure
1289 * We are happy with one success
1290 */
1291 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1292 {
1293 int err = -EINVAL, acqret;
1294 struct xfrm_mgr *km;
1295
1296 read_lock(&xfrm_km_lock);
1297 list_for_each_entry(km, &xfrm_km_list, list) {
1298 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT);
1299 if (!acqret)
1300 err = acqret;
1301 }
1302 read_unlock(&xfrm_km_lock);
1303 return err;
1304 }
1305 EXPORT_SYMBOL(km_query);
1306
1307 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1308 {
1309 int err = -EINVAL;
1310 struct xfrm_mgr *km;
1311
1312 read_lock(&xfrm_km_lock);
1313 list_for_each_entry(km, &xfrm_km_list, list) {
1314 if (km->new_mapping)
1315 err = km->new_mapping(x, ipaddr, sport);
1316 if (!err)
1317 break;
1318 }
1319 read_unlock(&xfrm_km_lock);
1320 return err;
1321 }
1322 EXPORT_SYMBOL(km_new_mapping);
1323
1324 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
1325 {
1326 struct km_event c;
1327
1328 c.data.hard = hard;
1329 c.pid = pid;
1330 c.event = XFRM_MSG_POLEXPIRE;
1331 km_policy_notify(pol, dir, &c);
1332
1333 if (hard)
1334 wake_up(&km_waitq);
1335 }
1336 EXPORT_SYMBOL(km_policy_expired);
1337
1338 int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1339 {
1340 int err = -EINVAL;
1341 int ret;
1342 struct xfrm_mgr *km;
1343
1344 read_lock(&xfrm_km_lock);
1345 list_for_each_entry(km, &xfrm_km_list, list) {
1346 if (km->report) {
1347 ret = km->report(proto, sel, addr);
1348 if (!ret)
1349 err = ret;
1350 }
1351 }
1352 read_unlock(&xfrm_km_lock);
1353 return err;
1354 }
1355 EXPORT_SYMBOL(km_report);
1356
1357 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1358 {
1359 int err;
1360 u8 *data;
1361 struct xfrm_mgr *km;
1362 struct xfrm_policy *pol = NULL;
1363
1364 if (optlen <= 0 || optlen > PAGE_SIZE)
1365 return -EMSGSIZE;
1366
1367 data = kmalloc(optlen, GFP_KERNEL);
1368 if (!data)
1369 return -ENOMEM;
1370
1371 err = -EFAULT;
1372 if (copy_from_user(data, optval, optlen))
1373 goto out;
1374
1375 err = -EINVAL;
1376 read_lock(&xfrm_km_lock);
1377 list_for_each_entry(km, &xfrm_km_list, list) {
1378 pol = km->compile_policy(sk, optname, data,
1379 optlen, &err);
1380 if (err >= 0)
1381 break;
1382 }
1383 read_unlock(&xfrm_km_lock);
1384
1385 if (err >= 0) {
1386 xfrm_sk_policy_insert(sk, err, pol);
1387 xfrm_pol_put(pol);
1388 err = 0;
1389 }
1390
1391 out:
1392 kfree(data);
1393 return err;
1394 }
1395 EXPORT_SYMBOL(xfrm_user_policy);
1396
1397 int xfrm_register_km(struct xfrm_mgr *km)
1398 {
1399 write_lock_bh(&xfrm_km_lock);
1400 list_add_tail(&km->list, &xfrm_km_list);
1401 write_unlock_bh(&xfrm_km_lock);
1402 return 0;
1403 }
1404 EXPORT_SYMBOL(xfrm_register_km);
1405
1406 int xfrm_unregister_km(struct xfrm_mgr *km)
1407 {
1408 write_lock_bh(&xfrm_km_lock);
1409 list_del(&km->list);
1410 write_unlock_bh(&xfrm_km_lock);
1411 return 0;
1412 }
1413 EXPORT_SYMBOL(xfrm_unregister_km);
1414
1415 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1416 {
1417 int err = 0;
1418 if (unlikely(afinfo == NULL))
1419 return -EINVAL;
1420 if (unlikely(afinfo->family >= NPROTO))
1421 return -EAFNOSUPPORT;
1422 write_lock_bh(&xfrm_state_afinfo_lock);
1423 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1424 err = -ENOBUFS;
1425 else
1426 xfrm_state_afinfo[afinfo->family] = afinfo;
1427 write_unlock_bh(&xfrm_state_afinfo_lock);
1428 return err;
1429 }
1430 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1431
1432 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1433 {
1434 int err = 0;
1435 if (unlikely(afinfo == NULL))
1436 return -EINVAL;
1437 if (unlikely(afinfo->family >= NPROTO))
1438 return -EAFNOSUPPORT;
1439 write_lock_bh(&xfrm_state_afinfo_lock);
1440 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1441 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1442 err = -EINVAL;
1443 else
1444 xfrm_state_afinfo[afinfo->family] = NULL;
1445 }
1446 write_unlock_bh(&xfrm_state_afinfo_lock);
1447 return err;
1448 }
1449 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1450
1451 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family)
1452 {
1453 struct xfrm_state_afinfo *afinfo;
1454 if (unlikely(family >= NPROTO))
1455 return NULL;
1456 read_lock(&xfrm_state_afinfo_lock);
1457 afinfo = xfrm_state_afinfo[family];
1458 if (unlikely(!afinfo))
1459 read_unlock(&xfrm_state_afinfo_lock);
1460 return afinfo;
1461 }
1462
1463 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1464 {
1465 read_unlock(&xfrm_state_afinfo_lock);
1466 }
1467
1468 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1469 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1470 {
1471 if (x->tunnel) {
1472 struct xfrm_state *t = x->tunnel;
1473
1474 if (atomic_read(&t->tunnel_users) == 2)
1475 xfrm_state_delete(t);
1476 atomic_dec(&t->tunnel_users);
1477 xfrm_state_put(t);
1478 x->tunnel = NULL;
1479 }
1480 }
1481 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1482
1483 /*
1484 * This function is NOT optimal. For example, with ESP it will give an
1485 * MTU that's usually two bytes short of being optimal. However, it will
1486 * usually give an answer that's a multiple of 4 provided the input is
1487 * also a multiple of 4.
1488 */
1489 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1490 {
1491 int res = mtu;
1492
1493 res -= x->props.header_len;
1494
1495 for (;;) {
1496 int m = res;
1497
1498 if (m < 68)
1499 return 68;
1500
1501 spin_lock_bh(&x->lock);
1502 if (x->km.state == XFRM_STATE_VALID &&
1503 x->type && x->type->get_max_size)
1504 m = x->type->get_max_size(x, m);
1505 else
1506 m += x->props.header_len;
1507 spin_unlock_bh(&x->lock);
1508
1509 if (m <= mtu)
1510 break;
1511 res -= (m - mtu);
1512 }
1513
1514 return res;
1515 }
1516
1517 int xfrm_init_state(struct xfrm_state *x)
1518 {
1519 struct xfrm_state_afinfo *afinfo;
1520 int family = x->props.family;
1521 int err;
1522
1523 err = -EAFNOSUPPORT;
1524 afinfo = xfrm_state_get_afinfo(family);
1525 if (!afinfo)
1526 goto error;
1527
1528 err = 0;
1529 if (afinfo->init_flags)
1530 err = afinfo->init_flags(x);
1531
1532 xfrm_state_put_afinfo(afinfo);
1533
1534 if (err)
1535 goto error;
1536
1537 err = -EPROTONOSUPPORT;
1538 x->type = xfrm_get_type(x->id.proto, family);
1539 if (x->type == NULL)
1540 goto error;
1541
1542 err = x->type->init_state(x);
1543 if (err)
1544 goto error;
1545
1546 x->mode = xfrm_get_mode(x->props.mode, family);
1547 if (x->mode == NULL)
1548 goto error;
1549
1550 x->km.state = XFRM_STATE_VALID;
1551
1552 error:
1553 return err;
1554 }
1555
1556 EXPORT_SYMBOL(xfrm_init_state);
1557
1558 void __init xfrm_state_init(void)
1559 {
1560 unsigned int sz;
1561
1562 sz = sizeof(struct hlist_head) * 8;
1563
1564 xfrm_state_bydst = xfrm_hash_alloc(sz);
1565 xfrm_state_bysrc = xfrm_hash_alloc(sz);
1566 xfrm_state_byspi = xfrm_hash_alloc(sz);
1567 if (!xfrm_state_bydst || !xfrm_state_bysrc || !xfrm_state_byspi)
1568 panic("XFRM: Cannot allocate bydst/bysrc/byspi hashes.");
1569 xfrm_state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
1570
1571 INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task);
1572 }
1573
Linux kernel - Deliverables
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