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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / xfrm / xfrm_state.c
blob5208b12fbfb4942d4142f79ddb41ccb1420a4c93
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 <linux/audit.h>
23 #include <asm/uaccess.h>
24 #include <linux/ktime.h>
25 #include <linux/slab.h>
26 #include <linux/interrupt.h>
27 #include <linux/kernel.h>
28
29 #include "xfrm_hash.h"
30
31 /* Each xfrm_state may be linked to two tables:
32
33 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
34 2. Hash table by (daddr,family,reqid) to find what SAs exist for given
35 destination/tunnel endpoint. (output)
36 */
37
38 static DEFINE_SPINLOCK(xfrm_state_lock);
39
40 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
41
42 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
43 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
44
45 #ifdef CONFIG_AUDITSYSCALL
46 static void xfrm_audit_state_replay(struct xfrm_state *x,
47 struct sk_buff *skb, __be32 net_seq);
48 #else
49 #define xfrm_audit_state_replay(x, s, sq) do { ; } while (0)
50 #endif /* CONFIG_AUDITSYSCALL */
51
52 static inline unsigned int xfrm_dst_hash(struct net *net,
53 xfrm_address_t *daddr,
54 xfrm_address_t *saddr,
55 u32 reqid,
56 unsigned short family)
57 {
58 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
59 }
60
61 static inline unsigned int xfrm_src_hash(struct net *net,
62 xfrm_address_t *daddr,
63 xfrm_address_t *saddr,
64 unsigned short family)
65 {
66 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
67 }
68
69 static inline unsigned int
70 xfrm_spi_hash(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
71 {
72 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
73 }
74
75 static void xfrm_hash_transfer(struct hlist_head *list,
76 struct hlist_head *ndsttable,
77 struct hlist_head *nsrctable,
78 struct hlist_head *nspitable,
79 unsigned int nhashmask)
80 {
81 struct hlist_node *entry, *tmp;
82 struct xfrm_state *x;
83
84 hlist_for_each_entry_safe(x, entry, tmp, list, bydst) {
85 unsigned int h;
86
87 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
88 x->props.reqid, x->props.family,
89 nhashmask);
90 hlist_add_head(&x->bydst, ndsttable+h);
91
92 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
93 x->props.family,
94 nhashmask);
95 hlist_add_head(&x->bysrc, nsrctable+h);
96
97 if (x->id.spi) {
98 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
99 x->id.proto, x->props.family,
100 nhashmask);
101 hlist_add_head(&x->byspi, nspitable+h);
102 }
103 }
104 }
105
106 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
107 {
108 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
109 }
110
111 static DEFINE_MUTEX(hash_resize_mutex);
112
113 static void xfrm_hash_resize(struct work_struct *work)
114 {
115 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
116 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
117 unsigned long nsize, osize;
118 unsigned int nhashmask, ohashmask;
119 int i;
120
121 mutex_lock(&hash_resize_mutex);
122
123 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
124 ndst = xfrm_hash_alloc(nsize);
125 if (!ndst)
126 goto out_unlock;
127 nsrc = xfrm_hash_alloc(nsize);
128 if (!nsrc) {
129 xfrm_hash_free(ndst, nsize);
130 goto out_unlock;
131 }
132 nspi = xfrm_hash_alloc(nsize);
133 if (!nspi) {
134 xfrm_hash_free(ndst, nsize);
135 xfrm_hash_free(nsrc, nsize);
136 goto out_unlock;
137 }
138
139 spin_lock_bh(&xfrm_state_lock);
140
141 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
142 for (i = net->xfrm.state_hmask; i >= 0; i--)
143 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
144 nhashmask);
145
146 odst = net->xfrm.state_bydst;
147 osrc = net->xfrm.state_bysrc;
148 ospi = net->xfrm.state_byspi;
149 ohashmask = net->xfrm.state_hmask;
150
151 net->xfrm.state_bydst = ndst;
152 net->xfrm.state_bysrc = nsrc;
153 net->xfrm.state_byspi = nspi;
154 net->xfrm.state_hmask = nhashmask;
155
156 spin_unlock_bh(&xfrm_state_lock);
157
158 osize = (ohashmask + 1) * sizeof(struct hlist_head);
159 xfrm_hash_free(odst, osize);
160 xfrm_hash_free(osrc, osize);
161 xfrm_hash_free(ospi, osize);
162
163 out_unlock:
164 mutex_unlock(&hash_resize_mutex);
165 }
166
167 static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
168 static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
169
170 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
171
172 int __xfrm_state_delete(struct xfrm_state *x);
173
174 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
175 void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
176
177 static struct xfrm_state_afinfo *xfrm_state_lock_afinfo(unsigned int family)
178 {
179 struct xfrm_state_afinfo *afinfo;
180 if (unlikely(family >= NPROTO))
181 return NULL;
182 write_lock_bh(&xfrm_state_afinfo_lock);
183 afinfo = xfrm_state_afinfo[family];
184 if (unlikely(!afinfo))
185 write_unlock_bh(&xfrm_state_afinfo_lock);
186 return afinfo;
187 }
188
189 static void xfrm_state_unlock_afinfo(struct xfrm_state_afinfo *afinfo)
190 __releases(xfrm_state_afinfo_lock)
191 {
192 write_unlock_bh(&xfrm_state_afinfo_lock);
193 }
194
195 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
196 {
197 struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
198 const struct xfrm_type **typemap;
199 int err = 0;
200
201 if (unlikely(afinfo == NULL))
202 return -EAFNOSUPPORT;
203 typemap = afinfo->type_map;
204
205 if (likely(typemap[type->proto] == NULL))
206 typemap[type->proto] = type;
207 else
208 err = -EEXIST;
209 xfrm_state_unlock_afinfo(afinfo);
210 return err;
211 }
212 EXPORT_SYMBOL(xfrm_register_type);
213
214 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
215 {
216 struct xfrm_state_afinfo *afinfo = xfrm_state_lock_afinfo(family);
217 const struct xfrm_type **typemap;
218 int err = 0;
219
220 if (unlikely(afinfo == NULL))
221 return -EAFNOSUPPORT;
222 typemap = afinfo->type_map;
223
224 if (unlikely(typemap[type->proto] != type))
225 err = -ENOENT;
226 else
227 typemap[type->proto] = NULL;
228 xfrm_state_unlock_afinfo(afinfo);
229 return err;
230 }
231 EXPORT_SYMBOL(xfrm_unregister_type);
232
233 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
234 {
235 struct xfrm_state_afinfo *afinfo;
236 const struct xfrm_type **typemap;
237 const struct xfrm_type *type;
238 int modload_attempted = 0;
239
240 retry:
241 afinfo = xfrm_state_get_afinfo(family);
242 if (unlikely(afinfo == NULL))
243 return NULL;
244 typemap = afinfo->type_map;
245
246 type = typemap[proto];
247 if (unlikely(type && !try_module_get(type->owner)))
248 type = NULL;
249 if (!type && !modload_attempted) {
250 xfrm_state_put_afinfo(afinfo);
251 request_module("xfrm-type-%d-%d", family, proto);
252 modload_attempted = 1;
253 goto retry;
254 }
255
256 xfrm_state_put_afinfo(afinfo);
257 return type;
258 }
259
260 static void xfrm_put_type(const struct xfrm_type *type)
261 {
262 module_put(type->owner);
263 }
264
265 int xfrm_register_mode(struct xfrm_mode *mode, int family)
266 {
267 struct xfrm_state_afinfo *afinfo;
268 struct xfrm_mode **modemap;
269 int err;
270
271 if (unlikely(mode->encap >= XFRM_MODE_MAX))
272 return -EINVAL;
273
274 afinfo = xfrm_state_lock_afinfo(family);
275 if (unlikely(afinfo == NULL))
276 return -EAFNOSUPPORT;
277
278 err = -EEXIST;
279 modemap = afinfo->mode_map;
280 if (modemap[mode->encap])
281 goto out;
282
283 err = -ENOENT;
284 if (!try_module_get(afinfo->owner))
285 goto out;
286
287 mode->afinfo = afinfo;
288 modemap[mode->encap] = mode;
289 err = 0;
290
291 out:
292 xfrm_state_unlock_afinfo(afinfo);
293 return err;
294 }
295 EXPORT_SYMBOL(xfrm_register_mode);
296
297 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
298 {
299 struct xfrm_state_afinfo *afinfo;
300 struct xfrm_mode **modemap;
301 int err;
302
303 if (unlikely(mode->encap >= XFRM_MODE_MAX))
304 return -EINVAL;
305
306 afinfo = xfrm_state_lock_afinfo(family);
307 if (unlikely(afinfo == NULL))
308 return -EAFNOSUPPORT;
309
310 err = -ENOENT;
311 modemap = afinfo->mode_map;
312 if (likely(modemap[mode->encap] == mode)) {
313 modemap[mode->encap] = NULL;
314 module_put(mode->afinfo->owner);
315 err = 0;
316 }
317
318 xfrm_state_unlock_afinfo(afinfo);
319 return err;
320 }
321 EXPORT_SYMBOL(xfrm_unregister_mode);
322
323 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
324 {
325 struct xfrm_state_afinfo *afinfo;
326 struct xfrm_mode *mode;
327 int modload_attempted = 0;
328
329 if (unlikely(encap >= XFRM_MODE_MAX))
330 return NULL;
331
332 retry:
333 afinfo = xfrm_state_get_afinfo(family);
334 if (unlikely(afinfo == NULL))
335 return NULL;
336
337 mode = afinfo->mode_map[encap];
338 if (unlikely(mode && !try_module_get(mode->owner)))
339 mode = NULL;
340 if (!mode && !modload_attempted) {
341 xfrm_state_put_afinfo(afinfo);
342 request_module("xfrm-mode-%d-%d", family, encap);
343 modload_attempted = 1;
344 goto retry;
345 }
346
347 xfrm_state_put_afinfo(afinfo);
348 return mode;
349 }
350
351 static void xfrm_put_mode(struct xfrm_mode *mode)
352 {
353 module_put(mode->owner);
354 }
355
356 static void xfrm_state_gc_destroy(struct xfrm_state *x)
357 {
358 tasklet_hrtimer_cancel(&x->mtimer);
359 del_timer_sync(&x->rtimer);
360 kfree(x->aalg);
361 kfree(x->ealg);
362 kfree(x->calg);
363 kfree(x->encap);
364 kfree(x->coaddr);
365 if (x->inner_mode)
366 xfrm_put_mode(x->inner_mode);
367 if (x->inner_mode_iaf)
368 xfrm_put_mode(x->inner_mode_iaf);
369 if (x->outer_mode)
370 xfrm_put_mode(x->outer_mode);
371 if (x->type) {
372 x->type->destructor(x);
373 xfrm_put_type(x->type);
374 }
375 security_xfrm_state_free(x);
376 kfree(x);
377 }
378
379 static void xfrm_state_gc_task(struct work_struct *work)
380 {
381 struct net *net = container_of(work, struct net, xfrm.state_gc_work);
382 struct xfrm_state *x;
383 struct hlist_node *entry, *tmp;
384 struct hlist_head gc_list;
385
386 spin_lock_bh(&xfrm_state_gc_lock);
387 hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
388 spin_unlock_bh(&xfrm_state_gc_lock);
389
390 hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist)
391 xfrm_state_gc_destroy(x);
392
393 wake_up(&net->xfrm.km_waitq);
394 }
395
396 static inline unsigned long make_jiffies(long secs)
397 {
398 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
399 return MAX_SCHEDULE_TIMEOUT-1;
400 else
401 return secs*HZ;
402 }
403
404 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
405 {
406 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
407 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
408 struct net *net = xs_net(x);
409 unsigned long now = get_seconds();
410 long next = LONG_MAX;
411 int warn = 0;
412 int err = 0;
413
414 spin_lock(&x->lock);
415 if (x->km.state == XFRM_STATE_DEAD)
416 goto out;
417 if (x->km.state == XFRM_STATE_EXPIRED)
418 goto expired;
419 if (x->lft.hard_add_expires_seconds) {
420 long tmo = x->lft.hard_add_expires_seconds +
421 x->curlft.add_time - now;
422 if (tmo <= 0)
423 goto expired;
424 if (tmo < next)
425 next = tmo;
426 }
427 if (x->lft.hard_use_expires_seconds) {
428 long tmo = x->lft.hard_use_expires_seconds +
429 (x->curlft.use_time ? : now) - now;
430 if (tmo <= 0)
431 goto expired;
432 if (tmo < next)
433 next = tmo;
434 }
435 if (x->km.dying)
436 goto resched;
437 if (x->lft.soft_add_expires_seconds) {
438 long tmo = x->lft.soft_add_expires_seconds +
439 x->curlft.add_time - now;
440 if (tmo <= 0)
441 warn = 1;
442 else if (tmo < next)
443 next = tmo;
444 }
445 if (x->lft.soft_use_expires_seconds) {
446 long tmo = x->lft.soft_use_expires_seconds +
447 (x->curlft.use_time ? : now) - now;
448 if (tmo <= 0)
449 warn = 1;
450 else if (tmo < next)
451 next = tmo;
452 }
453
454 x->km.dying = warn;
455 if (warn)
456 km_state_expired(x, 0, 0);
457 resched:
458 if (next != LONG_MAX){
459 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
460 }
461
462 goto out;
463
464 expired:
465 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
466 x->km.state = XFRM_STATE_EXPIRED;
467 wake_up(&net->xfrm.km_waitq);
468 next = 2;
469 goto resched;
470 }
471
472 err = __xfrm_state_delete(x);
473 if (!err && x->id.spi)
474 km_state_expired(x, 1, 0);
475
476 xfrm_audit_state_delete(x, err ? 0 : 1,
477 audit_get_loginuid(current),
478 audit_get_sessionid(current), 0);
479
480 out:
481 spin_unlock(&x->lock);
482 return HRTIMER_NORESTART;
483 }
484
485 static void xfrm_replay_timer_handler(unsigned long data);
486
487 struct xfrm_state *xfrm_state_alloc(struct net *net)
488 {
489 struct xfrm_state *x;
490
491 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
492
493 if (x) {
494 write_pnet(&x->xs_net, net);
495 atomic_set(&x->refcnt, 1);
496 atomic_set(&x->tunnel_users, 0);
497 INIT_LIST_HEAD(&x->km.all);
498 INIT_HLIST_NODE(&x->bydst);
499 INIT_HLIST_NODE(&x->bysrc);
500 INIT_HLIST_NODE(&x->byspi);
501 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS);
502 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
503 (unsigned long)x);
504 x->curlft.add_time = get_seconds();
505 x->lft.soft_byte_limit = XFRM_INF;
506 x->lft.soft_packet_limit = XFRM_INF;
507 x->lft.hard_byte_limit = XFRM_INF;
508 x->lft.hard_packet_limit = XFRM_INF;
509 x->replay_maxage = 0;
510 x->replay_maxdiff = 0;
511 x->inner_mode = NULL;
512 x->inner_mode_iaf = NULL;
513 spin_lock_init(&x->lock);
514 }
515 return x;
516 }
517 EXPORT_SYMBOL(xfrm_state_alloc);
518
519 void __xfrm_state_destroy(struct xfrm_state *x)
520 {
521 struct net *net = xs_net(x);
522
523 WARN_ON(x->km.state != XFRM_STATE_DEAD);
524
525 spin_lock_bh(&xfrm_state_gc_lock);
526 hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
527 spin_unlock_bh(&xfrm_state_gc_lock);
528 schedule_work(&net->xfrm.state_gc_work);
529 }
530 EXPORT_SYMBOL(__xfrm_state_destroy);
531
532 int __xfrm_state_delete(struct xfrm_state *x)
533 {
534 struct net *net = xs_net(x);
535 int err = -ESRCH;
536
537 if (x->km.state != XFRM_STATE_DEAD) {
538 x->km.state = XFRM_STATE_DEAD;
539 spin_lock(&xfrm_state_lock);
540 list_del(&x->km.all);
541 hlist_del(&x->bydst);
542 hlist_del(&x->bysrc);
543 if (x->id.spi)
544 hlist_del(&x->byspi);
545 net->xfrm.state_num--;
546 spin_unlock(&xfrm_state_lock);
547
548 /* All xfrm_state objects are created by xfrm_state_alloc.
549 * The xfrm_state_alloc call gives a reference, and that
550 * is what we are dropping here.
551 */
552 xfrm_state_put(x);
553 err = 0;
554 }
555
556 return err;
557 }
558 EXPORT_SYMBOL(__xfrm_state_delete);
559
560 int xfrm_state_delete(struct xfrm_state *x)
561 {
562 int err;
563
564 spin_lock_bh(&x->lock);
565 err = __xfrm_state_delete(x);
566 spin_unlock_bh(&x->lock);
567
568 return err;
569 }
570 EXPORT_SYMBOL(xfrm_state_delete);
571
572 #ifdef CONFIG_SECURITY_NETWORK_XFRM
573 static inline int
574 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
575 {
576 int i, err = 0;
577
578 for (i = 0; i <= net->xfrm.state_hmask; i++) {
579 struct hlist_node *entry;
580 struct xfrm_state *x;
581
582 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
583 if (xfrm_id_proto_match(x->id.proto, proto) &&
584 (err = security_xfrm_state_delete(x)) != 0) {
585 xfrm_audit_state_delete(x, 0,
586 audit_info->loginuid,
587 audit_info->sessionid,
588 audit_info->secid);
589 return err;
590 }
591 }
592 }
593
594 return err;
595 }
596 #else
597 static inline int
598 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
599 {
600 return 0;
601 }
602 #endif
603
604 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
605 {
606 int i, err = 0, cnt = 0;
607
608 spin_lock_bh(&xfrm_state_lock);
609 err = xfrm_state_flush_secctx_check(net, proto, audit_info);
610 if (err)
611 goto out;
612
613 err = -ESRCH;
614 for (i = 0; i <= net->xfrm.state_hmask; i++) {
615 struct hlist_node *entry;
616 struct xfrm_state *x;
617 restart:
618 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
619 if (!xfrm_state_kern(x) &&
620 xfrm_id_proto_match(x->id.proto, proto)) {
621 xfrm_state_hold(x);
622 spin_unlock_bh(&xfrm_state_lock);
623
624 err = xfrm_state_delete(x);
625 xfrm_audit_state_delete(x, err ? 0 : 1,
626 audit_info->loginuid,
627 audit_info->sessionid,
628 audit_info->secid);
629 xfrm_state_put(x);
630 if (!err)
631 cnt++;
632
633 spin_lock_bh(&xfrm_state_lock);
634 goto restart;
635 }
636 }
637 }
638 if (cnt)
639 err = 0;
640
641 out:
642 spin_unlock_bh(&xfrm_state_lock);
643 wake_up(&net->xfrm.km_waitq);
644 return err;
645 }
646 EXPORT_SYMBOL(xfrm_state_flush);
647
648 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
649 {
650 spin_lock_bh(&xfrm_state_lock);
651 si->sadcnt = net->xfrm.state_num;
652 si->sadhcnt = net->xfrm.state_hmask;
653 si->sadhmcnt = xfrm_state_hashmax;
654 spin_unlock_bh(&xfrm_state_lock);
655 }
656 EXPORT_SYMBOL(xfrm_sad_getinfo);
657
658 static int
659 xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl,
660 struct xfrm_tmpl *tmpl,
661 xfrm_address_t *daddr, xfrm_address_t *saddr,
662 unsigned short family)
663 {
664 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
665 if (!afinfo)
666 return -1;
667 afinfo->init_tempsel(x, fl, tmpl, daddr, saddr);
668 xfrm_state_put_afinfo(afinfo);
669 return 0;
670 }
671
672 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
673 {
674 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
675 struct xfrm_state *x;
676 struct hlist_node *entry;
677
678 hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) {
679 if (x->props.family != family ||
680 x->id.spi != spi ||
681 x->id.proto != proto ||
682 xfrm_addr_cmp(&x->id.daddr, daddr, family))
683 continue;
684
685 if ((mark & x->mark.m) != x->mark.v)
686 continue;
687 xfrm_state_hold(x);
688 return x;
689 }
690
691 return NULL;
692 }
693
694 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family)
695 {
696 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
697 struct xfrm_state *x;
698 struct hlist_node *entry;
699
700 hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) {
701 if (x->props.family != family ||
702 x->id.proto != proto ||
703 xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
704 xfrm_addr_cmp(&x->props.saddr, saddr, family))
705 continue;
706
707 if ((mark & x->mark.m) != x->mark.v)
708 continue;
709 xfrm_state_hold(x);
710 return x;
711 }
712
713 return NULL;
714 }
715
716 static inline struct xfrm_state *
717 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
718 {
719 struct net *net = xs_net(x);
720 u32 mark = x->mark.v & x->mark.m;
721
722 if (use_spi)
723 return __xfrm_state_lookup(net, mark, &x->id.daddr,
724 x->id.spi, x->id.proto, family);
725 else
726 return __xfrm_state_lookup_byaddr(net, mark,
727 &x->id.daddr,
728 &x->props.saddr,
729 x->id.proto, family);
730 }
731
732 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
733 {
734 if (have_hash_collision &&
735 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
736 net->xfrm.state_num > net->xfrm.state_hmask)
737 schedule_work(&net->xfrm.state_hash_work);
738 }
739
740 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
741 struct flowi *fl, unsigned short family,
742 xfrm_address_t *daddr, xfrm_address_t *saddr,
743 struct xfrm_state **best, int *acq_in_progress,
744 int *error)
745 {
746 /* Resolution logic:
747 * 1. There is a valid state with matching selector. Done.
748 * 2. Valid state with inappropriate selector. Skip.
749 *
750 * Entering area of "sysdeps".
751 *
752 * 3. If state is not valid, selector is temporary, it selects
753 * only session which triggered previous resolution. Key
754 * manager will do something to install a state with proper
755 * selector.
756 */
757 if (x->km.state == XFRM_STATE_VALID) {
758 if ((x->sel.family &&
759 !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
760 !security_xfrm_state_pol_flow_match(x, pol, fl))
761 return;
762
763 if (!*best ||
764 (*best)->km.dying > x->km.dying ||
765 ((*best)->km.dying == x->km.dying &&
766 (*best)->curlft.add_time < x->curlft.add_time))
767 *best = x;
768 } else if (x->km.state == XFRM_STATE_ACQ) {
769 *acq_in_progress = 1;
770 } else if (x->km.state == XFRM_STATE_ERROR ||
771 x->km.state == XFRM_STATE_EXPIRED) {
772 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
773 security_xfrm_state_pol_flow_match(x, pol, fl))
774 *error = -ESRCH;
775 }
776 }
777
778 struct xfrm_state *
779 xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
780 struct flowi *fl, struct xfrm_tmpl *tmpl,
781 struct xfrm_policy *pol, int *err,
782 unsigned short family)
783 {
784 static xfrm_address_t saddr_wildcard = { };
785 struct net *net = xp_net(pol);
786 unsigned int h, h_wildcard;
787 struct hlist_node *entry;
788 struct xfrm_state *x, *x0, *to_put;
789 int acquire_in_progress = 0;
790 int error = 0;
791 struct xfrm_state *best = NULL;
792 u32 mark = pol->mark.v & pol->mark.m;
793
794 to_put = NULL;
795
796 spin_lock_bh(&xfrm_state_lock);
797 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, family);
798 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
799 if (x->props.family == family &&
800 x->props.reqid == tmpl->reqid &&
801 (mark & x->mark.m) == x->mark.v &&
802 !(x->props.flags & XFRM_STATE_WILDRECV) &&
803 xfrm_state_addr_check(x, daddr, saddr, family) &&
804 tmpl->mode == x->props.mode &&
805 tmpl->id.proto == x->id.proto &&
806 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
807 xfrm_state_look_at(pol, x, fl, family, daddr, saddr,
808 &best, &acquire_in_progress, &error);
809 }
810 if (best)
811 goto found;
812
813 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, family);
814 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) {
815 if (x->props.family == family &&
816 x->props.reqid == tmpl->reqid &&
817 (mark & x->mark.m) == x->mark.v &&
818 !(x->props.flags & XFRM_STATE_WILDRECV) &&
819 xfrm_state_addr_check(x, daddr, saddr, family) &&
820 tmpl->mode == x->props.mode &&
821 tmpl->id.proto == x->id.proto &&
822 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
823 xfrm_state_look_at(pol, x, fl, family, daddr, saddr,
824 &best, &acquire_in_progress, &error);
825 }
826
827 found:
828 x = best;
829 if (!x && !error && !acquire_in_progress) {
830 if (tmpl->id.spi &&
831 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
832 tmpl->id.proto, family)) != NULL) {
833 to_put = x0;
834 error = -EEXIST;
835 goto out;
836 }
837 x = xfrm_state_alloc(net);
838 if (x == NULL) {
839 error = -ENOMEM;
840 goto out;
841 }
842 /* Initialize temporary selector matching only
843 * to current session. */
844 xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family);
845 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
846
847 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid);
848 if (error) {
849 x->km.state = XFRM_STATE_DEAD;
850 to_put = x;
851 x = NULL;
852 goto out;
853 }
854
855 if (km_query(x, tmpl, pol) == 0) {
856 x->km.state = XFRM_STATE_ACQ;
857 list_add(&x->km.all, &net->xfrm.state_all);
858 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
859 h = xfrm_src_hash(net, daddr, saddr, family);
860 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
861 if (x->id.spi) {
862 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, family);
863 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
864 }
865 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
866 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
867 net->xfrm.state_num++;
868 xfrm_hash_grow_check(net, x->bydst.next != NULL);
869 } else {
870 x->km.state = XFRM_STATE_DEAD;
871 to_put = x;
872 x = NULL;
873 error = -ESRCH;
874 }
875 }
876 out:
877 if (x)
878 xfrm_state_hold(x);
879 else
880 *err = acquire_in_progress ? -EAGAIN : error;
881 spin_unlock_bh(&xfrm_state_lock);
882 if (to_put)
883 xfrm_state_put(to_put);
884 return x;
885 }
886
887 struct xfrm_state *
888 xfrm_stateonly_find(struct net *net, u32 mark,
889 xfrm_address_t *daddr, xfrm_address_t *saddr,
890 unsigned short family, u8 mode, u8 proto, u32 reqid)
891 {
892 unsigned int h;
893 struct xfrm_state *rx = NULL, *x = NULL;
894 struct hlist_node *entry;
895
896 spin_lock(&xfrm_state_lock);
897 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
898 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
899 if (x->props.family == family &&
900 x->props.reqid == reqid &&
901 (mark & x->mark.m) == x->mark.v &&
902 !(x->props.flags & XFRM_STATE_WILDRECV) &&
903 xfrm_state_addr_check(x, daddr, saddr, family) &&
904 mode == x->props.mode &&
905 proto == x->id.proto &&
906 x->km.state == XFRM_STATE_VALID) {
907 rx = x;
908 break;
909 }
910 }
911
912 if (rx)
913 xfrm_state_hold(rx);
914 spin_unlock(&xfrm_state_lock);
915
916
917 return rx;
918 }
919 EXPORT_SYMBOL(xfrm_stateonly_find);
920
921 static void __xfrm_state_insert(struct xfrm_state *x)
922 {
923 struct net *net = xs_net(x);
924 unsigned int h;
925
926 list_add(&x->km.all, &net->xfrm.state_all);
927
928 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
929 x->props.reqid, x->props.family);
930 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
931
932 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
933 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
934
935 if (x->id.spi) {
936 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
937 x->props.family);
938
939 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
940 }
941
942 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
943 if (x->replay_maxage)
944 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
945
946 wake_up(&net->xfrm.km_waitq);
947
948 net->xfrm.state_num++;
949
950 xfrm_hash_grow_check(net, x->bydst.next != NULL);
951 }
952
953 /* xfrm_state_lock is held */
954 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
955 {
956 struct net *net = xs_net(xnew);
957 unsigned short family = xnew->props.family;
958 u32 reqid = xnew->props.reqid;
959 struct xfrm_state *x;
960 struct hlist_node *entry;
961 unsigned int h;
962 u32 mark = xnew->mark.v & xnew->mark.m;
963
964 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
965 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
966 if (x->props.family == family &&
967 x->props.reqid == reqid &&
968 (mark & x->mark.m) == x->mark.v &&
969 !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
970 !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
971 x->genid++;
972 }
973 }
974
975 void xfrm_state_insert(struct xfrm_state *x)
976 {
977 spin_lock_bh(&xfrm_state_lock);
978 __xfrm_state_bump_genids(x);
979 __xfrm_state_insert(x);
980 spin_unlock_bh(&xfrm_state_lock);
981 }
982 EXPORT_SYMBOL(xfrm_state_insert);
983
984 /* xfrm_state_lock is held */
985 static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m, unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create)
986 {
987 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
988 struct hlist_node *entry;
989 struct xfrm_state *x;
990 u32 mark = m->v & m->m;
991
992 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
993 if (x->props.reqid != reqid ||
994 x->props.mode != mode ||
995 x->props.family != family ||
996 x->km.state != XFRM_STATE_ACQ ||
997 x->id.spi != 0 ||
998 x->id.proto != proto ||
999 (mark & x->mark.m) != x->mark.v ||
1000 xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
1001 xfrm_addr_cmp(&x->props.saddr, saddr, family))
1002 continue;
1003
1004 xfrm_state_hold(x);
1005 return x;
1006 }
1007
1008 if (!create)
1009 return NULL;
1010
1011 x = xfrm_state_alloc(net);
1012 if (likely(x)) {
1013 switch (family) {
1014 case AF_INET:
1015 x->sel.daddr.a4 = daddr->a4;
1016 x->sel.saddr.a4 = saddr->a4;
1017 x->sel.prefixlen_d = 32;
1018 x->sel.prefixlen_s = 32;
1019 x->props.saddr.a4 = saddr->a4;
1020 x->id.daddr.a4 = daddr->a4;
1021 break;
1022
1023 case AF_INET6:
1024 ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6,
1025 (struct in6_addr *)daddr);
1026 ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6,
1027 (struct in6_addr *)saddr);
1028 x->sel.prefixlen_d = 128;
1029 x->sel.prefixlen_s = 128;
1030 ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6,
1031 (struct in6_addr *)saddr);
1032 ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6,
1033 (struct in6_addr *)daddr);
1034 break;
1035 }
1036
1037 x->km.state = XFRM_STATE_ACQ;
1038 x->id.proto = proto;
1039 x->props.family = family;
1040 x->props.mode = mode;
1041 x->props.reqid = reqid;
1042 x->mark.v = m->v;
1043 x->mark.m = m->m;
1044 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1045 xfrm_state_hold(x);
1046 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1047 list_add(&x->km.all, &net->xfrm.state_all);
1048 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1049 h = xfrm_src_hash(net, daddr, saddr, family);
1050 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1051
1052 net->xfrm.state_num++;
1053
1054 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1055 }
1056
1057 return x;
1058 }
1059
1060 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1061
1062 int xfrm_state_add(struct xfrm_state *x)
1063 {
1064 struct net *net = xs_net(x);
1065 struct xfrm_state *x1, *to_put;
1066 int family;
1067 int err;
1068 u32 mark = x->mark.v & x->mark.m;
1069 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1070
1071 family = x->props.family;
1072
1073 to_put = NULL;
1074
1075 spin_lock_bh(&xfrm_state_lock);
1076
1077 x1 = __xfrm_state_locate(x, use_spi, family);
1078 if (x1) {
1079 to_put = x1;
1080 x1 = NULL;
1081 err = -EEXIST;
1082 goto out;
1083 }
1084
1085 if (use_spi && x->km.seq) {
1086 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1087 if (x1 && ((x1->id.proto != x->id.proto) ||
1088 xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
1089 to_put = x1;
1090 x1 = NULL;
1091 }
1092 }
1093
1094 if (use_spi && !x1)
1095 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1096 x->props.reqid, x->id.proto,
1097 &x->id.daddr, &x->props.saddr, 0);
1098
1099 __xfrm_state_bump_genids(x);
1100 __xfrm_state_insert(x);
1101 err = 0;
1102
1103 out:
1104 spin_unlock_bh(&xfrm_state_lock);
1105
1106 if (x1) {
1107 xfrm_state_delete(x1);
1108 xfrm_state_put(x1);
1109 }
1110
1111 if (to_put)
1112 xfrm_state_put(to_put);
1113
1114 return err;
1115 }
1116 EXPORT_SYMBOL(xfrm_state_add);
1117
1118 #ifdef CONFIG_XFRM_MIGRATE
1119 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1120 {
1121 struct net *net = xs_net(orig);
1122 int err = -ENOMEM;
1123 struct xfrm_state *x = xfrm_state_alloc(net);
1124 if (!x)
1125 goto out;
1126
1127 memcpy(&x->id, &orig->id, sizeof(x->id));
1128 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1129 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1130 x->props.mode = orig->props.mode;
1131 x->props.replay_window = orig->props.replay_window;
1132 x->props.reqid = orig->props.reqid;
1133 x->props.family = orig->props.family;
1134 x->props.saddr = orig->props.saddr;
1135
1136 if (orig->aalg) {
1137 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1138 if (!x->aalg)
1139 goto error;
1140 }
1141 x->props.aalgo = orig->props.aalgo;
1142
1143 if (orig->ealg) {
1144 x->ealg = xfrm_algo_clone(orig->ealg);
1145 if (!x->ealg)
1146 goto error;
1147 }
1148 x->props.ealgo = orig->props.ealgo;
1149
1150 if (orig->calg) {
1151 x->calg = xfrm_algo_clone(orig->calg);
1152 if (!x->calg)
1153 goto error;
1154 }
1155 x->props.calgo = orig->props.calgo;
1156
1157 if (orig->encap) {
1158 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1159 if (!x->encap)
1160 goto error;
1161 }
1162
1163 if (orig->coaddr) {
1164 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1165 GFP_KERNEL);
1166 if (!x->coaddr)
1167 goto error;
1168 }
1169
1170 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1171
1172 err = xfrm_init_state(x);
1173 if (err)
1174 goto error;
1175
1176 x->props.flags = orig->props.flags;
1177
1178 x->curlft.add_time = orig->curlft.add_time;
1179 x->km.state = orig->km.state;
1180 x->km.seq = orig->km.seq;
1181
1182 return x;
1183
1184 error:
1185 xfrm_state_put(x);
1186 out:
1187 if (errp)
1188 *errp = err;
1189 return NULL;
1190 }
1191
1192 /* xfrm_state_lock is held */
1193 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1194 {
1195 unsigned int h;
1196 struct xfrm_state *x;
1197 struct hlist_node *entry;
1198
1199 if (m->reqid) {
1200 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1201 m->reqid, m->old_family);
1202 hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) {
1203 if (x->props.mode != m->mode ||
1204 x->id.proto != m->proto)
1205 continue;
1206 if (m->reqid && x->props.reqid != m->reqid)
1207 continue;
1208 if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1209 m->old_family) ||
1210 xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1211 m->old_family))
1212 continue;
1213 xfrm_state_hold(x);
1214 return x;
1215 }
1216 } else {
1217 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1218 m->old_family);
1219 hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) {
1220 if (x->props.mode != m->mode ||
1221 x->id.proto != m->proto)
1222 continue;
1223 if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1224 m->old_family) ||
1225 xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1226 m->old_family))
1227 continue;
1228 xfrm_state_hold(x);
1229 return x;
1230 }
1231 }
1232
1233 return NULL;
1234 }
1235 EXPORT_SYMBOL(xfrm_migrate_state_find);
1236
1237 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1238 struct xfrm_migrate *m)
1239 {
1240 struct xfrm_state *xc;
1241 int err;
1242
1243 xc = xfrm_state_clone(x, &err);
1244 if (!xc)
1245 return NULL;
1246
1247 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1248 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1249
1250 /* add state */
1251 if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) {
1252 /* a care is needed when the destination address of the
1253 state is to be updated as it is a part of triplet */
1254 xfrm_state_insert(xc);
1255 } else {
1256 if ((err = xfrm_state_add(xc)) < 0)
1257 goto error;
1258 }
1259
1260 return xc;
1261 error:
1262 kfree(xc);
1263 return NULL;
1264 }
1265 EXPORT_SYMBOL(xfrm_state_migrate);
1266 #endif
1267
1268 int xfrm_state_update(struct xfrm_state *x)
1269 {
1270 struct xfrm_state *x1, *to_put;
1271 int err;
1272 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1273
1274 to_put = NULL;
1275
1276 spin_lock_bh(&xfrm_state_lock);
1277 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1278
1279 err = -ESRCH;
1280 if (!x1)
1281 goto out;
1282
1283 if (xfrm_state_kern(x1)) {
1284 to_put = x1;
1285 err = -EEXIST;
1286 goto out;
1287 }
1288
1289 if (x1->km.state == XFRM_STATE_ACQ) {
1290 __xfrm_state_insert(x);
1291 x = NULL;
1292 }
1293 err = 0;
1294
1295 out:
1296 spin_unlock_bh(&xfrm_state_lock);
1297
1298 if (to_put)
1299 xfrm_state_put(to_put);
1300
1301 if (err)
1302 return err;
1303
1304 if (!x) {
1305 xfrm_state_delete(x1);
1306 xfrm_state_put(x1);
1307 return 0;
1308 }
1309
1310 err = -EINVAL;
1311 spin_lock_bh(&x1->lock);
1312 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1313 if (x->encap && x1->encap)
1314 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1315 if (x->coaddr && x1->coaddr) {
1316 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1317 }
1318 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1319 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1320 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1321 x1->km.dying = 0;
1322
1323 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1324 if (x1->curlft.use_time)
1325 xfrm_state_check_expire(x1);
1326
1327 err = 0;
1328 }
1329 spin_unlock_bh(&x1->lock);
1330
1331 xfrm_state_put(x1);
1332
1333 return err;
1334 }
1335 EXPORT_SYMBOL(xfrm_state_update);
1336
1337 int xfrm_state_check_expire(struct xfrm_state *x)
1338 {
1339 if (!x->curlft.use_time)
1340 x->curlft.use_time = get_seconds();
1341
1342 if (x->km.state != XFRM_STATE_VALID)
1343 return -EINVAL;
1344
1345 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1346 x->curlft.packets >= x->lft.hard_packet_limit) {
1347 x->km.state = XFRM_STATE_EXPIRED;
1348 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
1349 return -EINVAL;
1350 }
1351
1352 if (!x->km.dying &&
1353 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1354 x->curlft.packets >= x->lft.soft_packet_limit)) {
1355 x->km.dying = 1;
1356 km_state_expired(x, 0, 0);
1357 }
1358 return 0;
1359 }
1360 EXPORT_SYMBOL(xfrm_state_check_expire);
1361
1362 struct xfrm_state *
1363 xfrm_state_lookup(struct net *net, u32 mark, xfrm_address_t *daddr, __be32 spi,
1364 u8 proto, unsigned short family)
1365 {
1366 struct xfrm_state *x;
1367
1368 spin_lock_bh(&xfrm_state_lock);
1369 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1370 spin_unlock_bh(&xfrm_state_lock);
1371 return x;
1372 }
1373 EXPORT_SYMBOL(xfrm_state_lookup);
1374
1375 struct xfrm_state *
1376 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1377 xfrm_address_t *daddr, xfrm_address_t *saddr,
1378 u8 proto, unsigned short family)
1379 {
1380 struct xfrm_state *x;
1381
1382 spin_lock_bh(&xfrm_state_lock);
1383 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1384 spin_unlock_bh(&xfrm_state_lock);
1385 return x;
1386 }
1387 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1388
1389 struct xfrm_state *
1390 xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto,
1391 xfrm_address_t *daddr, xfrm_address_t *saddr,
1392 int create, unsigned short family)
1393 {
1394 struct xfrm_state *x;
1395
1396 spin_lock_bh(&xfrm_state_lock);
1397 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1398 spin_unlock_bh(&xfrm_state_lock);
1399
1400 return x;
1401 }
1402 EXPORT_SYMBOL(xfrm_find_acq);
1403
1404 #ifdef CONFIG_XFRM_SUB_POLICY
1405 int
1406 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1407 unsigned short family)
1408 {
1409 int err = 0;
1410 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1411 if (!afinfo)
1412 return -EAFNOSUPPORT;
1413
1414 spin_lock_bh(&xfrm_state_lock);
1415 if (afinfo->tmpl_sort)
1416 err = afinfo->tmpl_sort(dst, src, n);
1417 spin_unlock_bh(&xfrm_state_lock);
1418 xfrm_state_put_afinfo(afinfo);
1419 return err;
1420 }
1421 EXPORT_SYMBOL(xfrm_tmpl_sort);
1422
1423 int
1424 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1425 unsigned short family)
1426 {
1427 int err = 0;
1428 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1429 if (!afinfo)
1430 return -EAFNOSUPPORT;
1431
1432 spin_lock_bh(&xfrm_state_lock);
1433 if (afinfo->state_sort)
1434 err = afinfo->state_sort(dst, src, n);
1435 spin_unlock_bh(&xfrm_state_lock);
1436 xfrm_state_put_afinfo(afinfo);
1437 return err;
1438 }
1439 EXPORT_SYMBOL(xfrm_state_sort);
1440 #endif
1441
1442 /* Silly enough, but I'm lazy to build resolution list */
1443
1444 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1445 {
1446 int i;
1447
1448 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1449 struct hlist_node *entry;
1450 struct xfrm_state *x;
1451
1452 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
1453 if (x->km.seq == seq &&
1454 (mark & x->mark.m) == x->mark.v &&
1455 x->km.state == XFRM_STATE_ACQ) {
1456 xfrm_state_hold(x);
1457 return x;
1458 }
1459 }
1460 }
1461 return NULL;
1462 }
1463
1464 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1465 {
1466 struct xfrm_state *x;
1467
1468 spin_lock_bh(&xfrm_state_lock);
1469 x = __xfrm_find_acq_byseq(net, mark, seq);
1470 spin_unlock_bh(&xfrm_state_lock);
1471 return x;
1472 }
1473 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1474
1475 u32 xfrm_get_acqseq(void)
1476 {
1477 u32 res;
1478 static atomic_t acqseq;
1479
1480 do {
1481 res = atomic_inc_return(&acqseq);
1482 } while (!res);
1483
1484 return res;
1485 }
1486 EXPORT_SYMBOL(xfrm_get_acqseq);
1487
1488 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1489 {
1490 struct net *net = xs_net(x);
1491 unsigned int h;
1492 struct xfrm_state *x0;
1493 int err = -ENOENT;
1494 __be32 minspi = htonl(low);
1495 __be32 maxspi = htonl(high);
1496 u32 mark = x->mark.v & x->mark.m;
1497
1498 spin_lock_bh(&x->lock);
1499 if (x->km.state == XFRM_STATE_DEAD)
1500 goto unlock;
1501
1502 err = 0;
1503 if (x->id.spi)
1504 goto unlock;
1505
1506 err = -ENOENT;
1507
1508 if (minspi == maxspi) {
1509 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1510 if (x0) {
1511 xfrm_state_put(x0);
1512 goto unlock;
1513 }
1514 x->id.spi = minspi;
1515 } else {
1516 u32 spi = 0;
1517 for (h=0; h<high-low+1; h++) {
1518 spi = low + net_random()%(high-low+1);
1519 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1520 if (x0 == NULL) {
1521 x->id.spi = htonl(spi);
1522 break;
1523 }
1524 xfrm_state_put(x0);
1525 }
1526 }
1527 if (x->id.spi) {
1528 spin_lock_bh(&xfrm_state_lock);
1529 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1530 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1531 spin_unlock_bh(&xfrm_state_lock);
1532
1533 err = 0;
1534 }
1535
1536 unlock:
1537 spin_unlock_bh(&x->lock);
1538
1539 return err;
1540 }
1541 EXPORT_SYMBOL(xfrm_alloc_spi);
1542
1543 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1544 int (*func)(struct xfrm_state *, int, void*),
1545 void *data)
1546 {
1547 struct xfrm_state *state;
1548 struct xfrm_state_walk *x;
1549 int err = 0;
1550
1551 if (walk->seq != 0 && list_empty(&walk->all))
1552 return 0;
1553
1554 spin_lock_bh(&xfrm_state_lock);
1555 if (list_empty(&walk->all))
1556 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1557 else
1558 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1559 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1560 if (x->state == XFRM_STATE_DEAD)
1561 continue;
1562 state = container_of(x, struct xfrm_state, km);
1563 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1564 continue;
1565 err = func(state, walk->seq, data);
1566 if (err) {
1567 list_move_tail(&walk->all, &x->all);
1568 goto out;
1569 }
1570 walk->seq++;
1571 }
1572 if (walk->seq == 0) {
1573 err = -ENOENT;
1574 goto out;
1575 }
1576 list_del_init(&walk->all);
1577 out:
1578 spin_unlock_bh(&xfrm_state_lock);
1579 return err;
1580 }
1581 EXPORT_SYMBOL(xfrm_state_walk);
1582
1583 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1584 {
1585 INIT_LIST_HEAD(&walk->all);
1586 walk->proto = proto;
1587 walk->state = XFRM_STATE_DEAD;
1588 walk->seq = 0;
1589 }
1590 EXPORT_SYMBOL(xfrm_state_walk_init);
1591
1592 void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1593 {
1594 if (list_empty(&walk->all))
1595 return;
1596
1597 spin_lock_bh(&xfrm_state_lock);
1598 list_del(&walk->all);
1599 spin_unlock_bh(&xfrm_state_lock);
1600 }
1601 EXPORT_SYMBOL(xfrm_state_walk_done);
1602
1603
1604 void xfrm_replay_notify(struct xfrm_state *x, int event)
1605 {
1606 struct km_event c;
1607 /* we send notify messages in case
1608 * 1. we updated on of the sequence numbers, and the seqno difference
1609 * is at least x->replay_maxdiff, in this case we also update the
1610 * timeout of our timer function
1611 * 2. if x->replay_maxage has elapsed since last update,
1612 * and there were changes
1613 *
1614 * The state structure must be locked!
1615 */
1616
1617 switch (event) {
1618 case XFRM_REPLAY_UPDATE:
1619 if (x->replay_maxdiff &&
1620 (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
1621 (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) {
1622 if (x->xflags & XFRM_TIME_DEFER)
1623 event = XFRM_REPLAY_TIMEOUT;
1624 else
1625 return;
1626 }
1627
1628 break;
1629
1630 case XFRM_REPLAY_TIMEOUT:
1631 if ((x->replay.seq == x->preplay.seq) &&
1632 (x->replay.bitmap == x->preplay.bitmap) &&
1633 (x->replay.oseq == x->preplay.oseq)) {
1634 x->xflags |= XFRM_TIME_DEFER;
1635 return;
1636 }
1637
1638 break;
1639 }
1640
1641 memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
1642 c.event = XFRM_MSG_NEWAE;
1643 c.data.aevent = event;
1644 km_state_notify(x, &c);
1645
1646 if (x->replay_maxage &&
1647 !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
1648 x->xflags &= ~XFRM_TIME_DEFER;
1649 }
1650
1651 static void xfrm_replay_timer_handler(unsigned long data)
1652 {
1653 struct xfrm_state *x = (struct xfrm_state*)data;
1654
1655 spin_lock(&x->lock);
1656
1657 if (x->km.state == XFRM_STATE_VALID) {
1658 if (xfrm_aevent_is_on(xs_net(x)))
1659 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
1660 else
1661 x->xflags |= XFRM_TIME_DEFER;
1662 }
1663
1664 spin_unlock(&x->lock);
1665 }
1666
1667 int xfrm_replay_check(struct xfrm_state *x,
1668 struct sk_buff *skb, __be32 net_seq)
1669 {
1670 u32 diff;
1671 u32 seq = ntohl(net_seq);
1672
1673 if (unlikely(seq == 0))
1674 goto err;
1675
1676 if (likely(seq > x->replay.seq))
1677 return 0;
1678
1679 diff = x->replay.seq - seq;
1680 if (diff >= min_t(unsigned int, x->props.replay_window,
1681 sizeof(x->replay.bitmap) * 8)) {
1682 x->stats.replay_window++;
1683 goto err;
1684 }
1685
1686 if (x->replay.bitmap & (1U << diff)) {
1687 x->stats.replay++;
1688 goto err;
1689 }
1690 return 0;
1691
1692 err:
1693 xfrm_audit_state_replay(x, skb, net_seq);
1694 return -EINVAL;
1695 }
1696
1697 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq)
1698 {
1699 u32 diff;
1700 u32 seq = ntohl(net_seq);
1701
1702 if (seq > x->replay.seq) {
1703 diff = seq - x->replay.seq;
1704 if (diff < x->props.replay_window)
1705 x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
1706 else
1707 x->replay.bitmap = 1;
1708 x->replay.seq = seq;
1709 } else {
1710 diff = x->replay.seq - seq;
1711 x->replay.bitmap |= (1U << diff);
1712 }
1713
1714 if (xfrm_aevent_is_on(xs_net(x)))
1715 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1716 }
1717
1718 static LIST_HEAD(xfrm_km_list);
1719 static DEFINE_RWLOCK(xfrm_km_lock);
1720
1721 void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1722 {
1723 struct xfrm_mgr *km;
1724
1725 read_lock(&xfrm_km_lock);
1726 list_for_each_entry(km, &xfrm_km_list, list)
1727 if (km->notify_policy)
1728 km->notify_policy(xp, dir, c);
1729 read_unlock(&xfrm_km_lock);
1730 }
1731
1732 void km_state_notify(struct xfrm_state *x, struct km_event *c)
1733 {
1734 struct xfrm_mgr *km;
1735 read_lock(&xfrm_km_lock);
1736 list_for_each_entry(km, &xfrm_km_list, list)
1737 if (km->notify)
1738 km->notify(x, c);
1739 read_unlock(&xfrm_km_lock);
1740 }
1741
1742 EXPORT_SYMBOL(km_policy_notify);
1743 EXPORT_SYMBOL(km_state_notify);
1744
1745 void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
1746 {
1747 struct net *net = xs_net(x);
1748 struct km_event c;
1749
1750 c.data.hard = hard;
1751 c.pid = pid;
1752 c.event = XFRM_MSG_EXPIRE;
1753 km_state_notify(x, &c);
1754
1755 if (hard)
1756 wake_up(&net->xfrm.km_waitq);
1757 }
1758
1759 EXPORT_SYMBOL(km_state_expired);
1760 /*
1761 * We send to all registered managers regardless of failure
1762 * We are happy with one success
1763 */
1764 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1765 {
1766 int err = -EINVAL, acqret;
1767 struct xfrm_mgr *km;
1768
1769 read_lock(&xfrm_km_lock);
1770 list_for_each_entry(km, &xfrm_km_list, list) {
1771 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT);
1772 if (!acqret)
1773 err = acqret;
1774 }
1775 read_unlock(&xfrm_km_lock);
1776 return err;
1777 }
1778 EXPORT_SYMBOL(km_query);
1779
1780 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1781 {
1782 int err = -EINVAL;
1783 struct xfrm_mgr *km;
1784
1785 read_lock(&xfrm_km_lock);
1786 list_for_each_entry(km, &xfrm_km_list, list) {
1787 if (km->new_mapping)
1788 err = km->new_mapping(x, ipaddr, sport);
1789 if (!err)
1790 break;
1791 }
1792 read_unlock(&xfrm_km_lock);
1793 return err;
1794 }
1795 EXPORT_SYMBOL(km_new_mapping);
1796
1797 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
1798 {
1799 struct net *net = xp_net(pol);
1800 struct km_event c;
1801
1802 c.data.hard = hard;
1803 c.pid = pid;
1804 c.event = XFRM_MSG_POLEXPIRE;
1805 km_policy_notify(pol, dir, &c);
1806
1807 if (hard)
1808 wake_up(&net->xfrm.km_waitq);
1809 }
1810 EXPORT_SYMBOL(km_policy_expired);
1811
1812 #ifdef CONFIG_XFRM_MIGRATE
1813 int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1814 struct xfrm_migrate *m, int num_migrate,
1815 struct xfrm_kmaddress *k)
1816 {
1817 int err = -EINVAL;
1818 int ret;
1819 struct xfrm_mgr *km;
1820
1821 read_lock(&xfrm_km_lock);
1822 list_for_each_entry(km, &xfrm_km_list, list) {
1823 if (km->migrate) {
1824 ret = km->migrate(sel, dir, type, m, num_migrate, k);
1825 if (!ret)
1826 err = ret;
1827 }
1828 }
1829 read_unlock(&xfrm_km_lock);
1830 return err;
1831 }
1832 EXPORT_SYMBOL(km_migrate);
1833 #endif
1834
1835 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1836 {
1837 int err = -EINVAL;
1838 int ret;
1839 struct xfrm_mgr *km;
1840
1841 read_lock(&xfrm_km_lock);
1842 list_for_each_entry(km, &xfrm_km_list, list) {
1843 if (km->report) {
1844 ret = km->report(net, proto, sel, addr);
1845 if (!ret)
1846 err = ret;
1847 }
1848 }
1849 read_unlock(&xfrm_km_lock);
1850 return err;
1851 }
1852 EXPORT_SYMBOL(km_report);
1853
1854 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1855 {
1856 int err;
1857 u8 *data;
1858 struct xfrm_mgr *km;
1859 struct xfrm_policy *pol = NULL;
1860
1861 if (optlen <= 0 || optlen > PAGE_SIZE)
1862 return -EMSGSIZE;
1863
1864 data = kmalloc(optlen, GFP_KERNEL);
1865 if (!data)
1866 return -ENOMEM;
1867
1868 err = -EFAULT;
1869 if (copy_from_user(data, optval, optlen))
1870 goto out;
1871
1872 err = -EINVAL;
1873 read_lock(&xfrm_km_lock);
1874 list_for_each_entry(km, &xfrm_km_list, list) {
1875 pol = km->compile_policy(sk, optname, data,
1876 optlen, &err);
1877 if (err >= 0)
1878 break;
1879 }
1880 read_unlock(&xfrm_km_lock);
1881
1882 if (err >= 0) {
1883 xfrm_sk_policy_insert(sk, err, pol);
1884 xfrm_pol_put(pol);
1885 err = 0;
1886 }
1887
1888 out:
1889 kfree(data);
1890 return err;
1891 }
1892 EXPORT_SYMBOL(xfrm_user_policy);
1893
1894 int xfrm_register_km(struct xfrm_mgr *km)
1895 {
1896 write_lock_bh(&xfrm_km_lock);
1897 list_add_tail(&km->list, &xfrm_km_list);
1898 write_unlock_bh(&xfrm_km_lock);
1899 return 0;
1900 }
1901 EXPORT_SYMBOL(xfrm_register_km);
1902
1903 int xfrm_unregister_km(struct xfrm_mgr *km)
1904 {
1905 write_lock_bh(&xfrm_km_lock);
1906 list_del(&km->list);
1907 write_unlock_bh(&xfrm_km_lock);
1908 return 0;
1909 }
1910 EXPORT_SYMBOL(xfrm_unregister_km);
1911
1912 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1913 {
1914 int err = 0;
1915 if (unlikely(afinfo == NULL))
1916 return -EINVAL;
1917 if (unlikely(afinfo->family >= NPROTO))
1918 return -EAFNOSUPPORT;
1919 write_lock_bh(&xfrm_state_afinfo_lock);
1920 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1921 err = -ENOBUFS;
1922 else
1923 xfrm_state_afinfo[afinfo->family] = afinfo;
1924 write_unlock_bh(&xfrm_state_afinfo_lock);
1925 return err;
1926 }
1927 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1928
1929 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1930 {
1931 int err = 0;
1932 if (unlikely(afinfo == NULL))
1933 return -EINVAL;
1934 if (unlikely(afinfo->family >= NPROTO))
1935 return -EAFNOSUPPORT;
1936 write_lock_bh(&xfrm_state_afinfo_lock);
1937 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1938 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1939 err = -EINVAL;
1940 else
1941 xfrm_state_afinfo[afinfo->family] = NULL;
1942 }
1943 write_unlock_bh(&xfrm_state_afinfo_lock);
1944 return err;
1945 }
1946 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1947
1948 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1949 {
1950 struct xfrm_state_afinfo *afinfo;
1951 if (unlikely(family >= NPROTO))
1952 return NULL;
1953 read_lock(&xfrm_state_afinfo_lock);
1954 afinfo = xfrm_state_afinfo[family];
1955 if (unlikely(!afinfo))
1956 read_unlock(&xfrm_state_afinfo_lock);
1957 return afinfo;
1958 }
1959
1960 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1961 __releases(xfrm_state_afinfo_lock)
1962 {
1963 read_unlock(&xfrm_state_afinfo_lock);
1964 }
1965
1966 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1967 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1968 {
1969 if (x->tunnel) {
1970 struct xfrm_state *t = x->tunnel;
1971
1972 if (atomic_read(&t->tunnel_users) == 2)
1973 xfrm_state_delete(t);
1974 atomic_dec(&t->tunnel_users);
1975 xfrm_state_put(t);
1976 x->tunnel = NULL;
1977 }
1978 }
1979 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1980
1981 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1982 {
1983 int res;
1984
1985 spin_lock_bh(&x->lock);
1986 if (x->km.state == XFRM_STATE_VALID &&
1987 x->type && x->type->get_mtu)
1988 res = x->type->get_mtu(x, mtu);
1989 else
1990 res = mtu - x->props.header_len;
1991 spin_unlock_bh(&x->lock);
1992 return res;
1993 }
1994
1995 int xfrm_init_state(struct xfrm_state *x)
1996 {
1997 struct xfrm_state_afinfo *afinfo;
1998 struct xfrm_mode *inner_mode;
1999 int family = x->props.family;
2000 int err;
2001
2002 err = -EAFNOSUPPORT;
2003 afinfo = xfrm_state_get_afinfo(family);
2004 if (!afinfo)
2005 goto error;
2006
2007 err = 0;
2008 if (afinfo->init_flags)
2009 err = afinfo->init_flags(x);
2010
2011 xfrm_state_put_afinfo(afinfo);
2012
2013 if (err)
2014 goto error;
2015
2016 err = -EPROTONOSUPPORT;
2017
2018 if (x->sel.family != AF_UNSPEC) {
2019 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2020 if (inner_mode == NULL)
2021 goto error;
2022
2023 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2024 family != x->sel.family) {
2025 xfrm_put_mode(inner_mode);
2026 goto error;
2027 }
2028
2029 x->inner_mode = inner_mode;
2030 } else {
2031 struct xfrm_mode *inner_mode_iaf;
2032 int iafamily = AF_INET;
2033
2034 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2035 if (inner_mode == NULL)
2036 goto error;
2037
2038 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2039 xfrm_put_mode(inner_mode);
2040 goto error;
2041 }
2042 x->inner_mode = inner_mode;
2043
2044 if (x->props.family == AF_INET)
2045 iafamily = AF_INET6;
2046
2047 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2048 if (inner_mode_iaf) {
2049 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2050 x->inner_mode_iaf = inner_mode_iaf;
2051 else
2052 xfrm_put_mode(inner_mode_iaf);
2053 }
2054 }
2055
2056 x->type = xfrm_get_type(x->id.proto, family);
2057 if (x->type == NULL)
2058 goto error;
2059
2060 err = x->type->init_state(x);
2061 if (err)
2062 goto error;
2063
2064 x->outer_mode = xfrm_get_mode(x->props.mode, family);
2065 if (x->outer_mode == NULL)
2066 goto error;
2067
2068 x->km.state = XFRM_STATE_VALID;
2069
2070 error:
2071 return err;
2072 }
2073
2074 EXPORT_SYMBOL(xfrm_init_state);
2075
2076 int __net_init xfrm_state_init(struct net *net)
2077 {
2078 unsigned int sz;
2079
2080 INIT_LIST_HEAD(&net->xfrm.state_all);
2081
2082 sz = sizeof(struct hlist_head) * 8;
2083
2084 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2085 if (!net->xfrm.state_bydst)
2086 goto out_bydst;
2087 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2088 if (!net->xfrm.state_bysrc)
2089 goto out_bysrc;
2090 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2091 if (!net->xfrm.state_byspi)
2092 goto out_byspi;
2093 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2094
2095 net->xfrm.state_num = 0;
2096 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2097 INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2098 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2099 init_waitqueue_head(&net->xfrm.km_waitq);
2100 return 0;
2101
2102 out_byspi:
2103 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2104 out_bysrc:
2105 xfrm_hash_free(net->xfrm.state_bydst, sz);
2106 out_bydst:
2107 return -ENOMEM;
2108 }
2109
2110 void xfrm_state_fini(struct net *net)
2111 {
2112 struct xfrm_audit audit_info;
2113 unsigned int sz;
2114
2115 flush_work(&net->xfrm.state_hash_work);
2116 audit_info.loginuid = -1;
2117 audit_info.sessionid = -1;
2118 audit_info.secid = 0;
2119 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2120 flush_work(&net->xfrm.state_gc_work);
2121
2122 WARN_ON(!list_empty(&net->xfrm.state_all));
2123
2124 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2125 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2126 xfrm_hash_free(net->xfrm.state_byspi, sz);
2127 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2128 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2129 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2130 xfrm_hash_free(net->xfrm.state_bydst, sz);
2131 }
2132
2133 #ifdef CONFIG_AUDITSYSCALL
2134 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2135 struct audit_buffer *audit_buf)
2136 {
2137 struct xfrm_sec_ctx *ctx = x->security;
2138 u32 spi = ntohl(x->id.spi);
2139
2140 if (ctx)
2141 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2142 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2143
2144 switch(x->props.family) {
2145 case AF_INET:
2146 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2147 &x->props.saddr.a4, &x->id.daddr.a4);
2148 break;
2149 case AF_INET6:
2150 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2151 x->props.saddr.a6, x->id.daddr.a6);
2152 break;
2153 }
2154
2155 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2156 }
2157
2158 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2159 struct audit_buffer *audit_buf)
2160 {
2161 struct iphdr *iph4;
2162 struct ipv6hdr *iph6;
2163
2164 switch (family) {
2165 case AF_INET:
2166 iph4 = ip_hdr(skb);
2167 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2168 &iph4->saddr, &iph4->daddr);
2169 break;
2170 case AF_INET6:
2171 iph6 = ipv6_hdr(skb);
2172 audit_log_format(audit_buf,
2173 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2174 &iph6->saddr,&iph6->daddr,
2175 iph6->flow_lbl[0] & 0x0f,
2176 iph6->flow_lbl[1],
2177 iph6->flow_lbl[2]);
2178 break;
2179 }
2180 }
2181
2182 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2183 uid_t auid, u32 sessionid, u32 secid)
2184 {
2185 struct audit_buffer *audit_buf;
2186
2187 audit_buf = xfrm_audit_start("SAD-add");
2188 if (audit_buf == NULL)
2189 return;
2190 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2191 xfrm_audit_helper_sainfo(x, audit_buf);
2192 audit_log_format(audit_buf, " res=%u", result);
2193 audit_log_end(audit_buf);
2194 }
2195 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2196
2197 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2198 uid_t auid, u32 sessionid, u32 secid)
2199 {
2200 struct audit_buffer *audit_buf;
2201
2202 audit_buf = xfrm_audit_start("SAD-delete");
2203 if (audit_buf == NULL)
2204 return;
2205 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2206 xfrm_audit_helper_sainfo(x, audit_buf);
2207 audit_log_format(audit_buf, " res=%u", result);
2208 audit_log_end(audit_buf);
2209 }
2210 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2211
2212 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2213 struct sk_buff *skb)
2214 {
2215 struct audit_buffer *audit_buf;
2216 u32 spi;
2217
2218 audit_buf = xfrm_audit_start("SA-replay-overflow");
2219 if (audit_buf == NULL)
2220 return;
2221 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2222 /* don't record the sequence number because it's inherent in this kind
2223 * of audit message */
2224 spi = ntohl(x->id.spi);
2225 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2226 audit_log_end(audit_buf);
2227 }
2228 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2229
2230 static void xfrm_audit_state_replay(struct xfrm_state *x,
2231 struct sk_buff *skb, __be32 net_seq)
2232 {
2233 struct audit_buffer *audit_buf;
2234 u32 spi;
2235
2236 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2237 if (audit_buf == NULL)
2238 return;
2239 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2240 spi = ntohl(x->id.spi);
2241 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2242 spi, spi, ntohl(net_seq));
2243 audit_log_end(audit_buf);
2244 }
2245
2246 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2247 {
2248 struct audit_buffer *audit_buf;
2249
2250 audit_buf = xfrm_audit_start("SA-notfound");
2251 if (audit_buf == NULL)
2252 return;
2253 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2254 audit_log_end(audit_buf);
2255 }
2256 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2257
2258 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2259 __be32 net_spi, __be32 net_seq)
2260 {
2261 struct audit_buffer *audit_buf;
2262 u32 spi;
2263
2264 audit_buf = xfrm_audit_start("SA-notfound");
2265 if (audit_buf == NULL)
2266 return;
2267 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2268 spi = ntohl(net_spi);
2269 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2270 spi, spi, ntohl(net_seq));
2271 audit_log_end(audit_buf);
2272 }
2273 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2274
2275 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2276 struct sk_buff *skb, u8 proto)
2277 {
2278 struct audit_buffer *audit_buf;
2279 __be32 net_spi;
2280 __be32 net_seq;
2281
2282 audit_buf = xfrm_audit_start("SA-icv-failure");
2283 if (audit_buf == NULL)
2284 return;
2285 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2286 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2287 u32 spi = ntohl(net_spi);
2288 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2289 spi, spi, ntohl(net_seq));
2290 }
2291 audit_log_end(audit_buf);
2292 }
2293 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2294 #endif /* CONFIG_AUDITSYSCALL */
linux-next