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Merge branch 'kvm-updates/2.6.33' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[linux-2.6/linux-2.6-openrd.git] / net / xfrm / xfrm_state.c
blobb36cc344474b33a76d6d257d4a8f6474ef3ba204
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/interrupt.h>
26 #include <linux/kernel.h>
27
28 #include "xfrm_hash.h"
29
30 /* Each xfrm_state may be linked to two tables:
31
32 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
33 2. Hash table by (daddr,family,reqid) to find what SAs exist for given
34 destination/tunnel endpoint. (output)
35 */
36
37 static DEFINE_SPINLOCK(xfrm_state_lock);
38
39 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
40 static unsigned int xfrm_state_genid;
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;
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 for (i = 0; i <= net->xfrm.state_hmask; i++) {
614 struct hlist_node *entry;
615 struct xfrm_state *x;
616 restart:
617 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
618 if (!xfrm_state_kern(x) &&
619 xfrm_id_proto_match(x->id.proto, proto)) {
620 xfrm_state_hold(x);
621 spin_unlock_bh(&xfrm_state_lock);
622
623 err = xfrm_state_delete(x);
624 xfrm_audit_state_delete(x, err ? 0 : 1,
625 audit_info->loginuid,
626 audit_info->sessionid,
627 audit_info->secid);
628 xfrm_state_put(x);
629
630 spin_lock_bh(&xfrm_state_lock);
631 goto restart;
632 }
633 }
634 }
635 err = 0;
636
637 out:
638 spin_unlock_bh(&xfrm_state_lock);
639 wake_up(&net->xfrm.km_waitq);
640 return err;
641 }
642 EXPORT_SYMBOL(xfrm_state_flush);
643
644 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
645 {
646 spin_lock_bh(&xfrm_state_lock);
647 si->sadcnt = net->xfrm.state_num;
648 si->sadhcnt = net->xfrm.state_hmask;
649 si->sadhmcnt = xfrm_state_hashmax;
650 spin_unlock_bh(&xfrm_state_lock);
651 }
652 EXPORT_SYMBOL(xfrm_sad_getinfo);
653
654 static int
655 xfrm_init_tempsel(struct xfrm_state *x, struct flowi *fl,
656 struct xfrm_tmpl *tmpl,
657 xfrm_address_t *daddr, xfrm_address_t *saddr,
658 unsigned short family)
659 {
660 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
661 if (!afinfo)
662 return -1;
663 afinfo->init_tempsel(x, fl, tmpl, daddr, saddr);
664 xfrm_state_put_afinfo(afinfo);
665 return 0;
666 }
667
668 static struct xfrm_state *__xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family)
669 {
670 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
671 struct xfrm_state *x;
672 struct hlist_node *entry;
673
674 hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) {
675 if (x->props.family != family ||
676 x->id.spi != spi ||
677 x->id.proto != proto ||
678 xfrm_addr_cmp(&x->id.daddr, daddr, family))
679 continue;
680
681 xfrm_state_hold(x);
682 return x;
683 }
684
685 return NULL;
686 }
687
688 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family)
689 {
690 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
691 struct xfrm_state *x;
692 struct hlist_node *entry;
693
694 hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) {
695 if (x->props.family != family ||
696 x->id.proto != proto ||
697 xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
698 xfrm_addr_cmp(&x->props.saddr, saddr, family))
699 continue;
700
701 xfrm_state_hold(x);
702 return x;
703 }
704
705 return NULL;
706 }
707
708 static inline struct xfrm_state *
709 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
710 {
711 struct net *net = xs_net(x);
712
713 if (use_spi)
714 return __xfrm_state_lookup(net, &x->id.daddr, x->id.spi,
715 x->id.proto, family);
716 else
717 return __xfrm_state_lookup_byaddr(net, &x->id.daddr,
718 &x->props.saddr,
719 x->id.proto, family);
720 }
721
722 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
723 {
724 if (have_hash_collision &&
725 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
726 net->xfrm.state_num > net->xfrm.state_hmask)
727 schedule_work(&net->xfrm.state_hash_work);
728 }
729
730 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
731 struct flowi *fl, unsigned short family,
732 xfrm_address_t *daddr, xfrm_address_t *saddr,
733 struct xfrm_state **best, int *acq_in_progress,
734 int *error)
735 {
736 /* Resolution logic:
737 * 1. There is a valid state with matching selector. Done.
738 * 2. Valid state with inappropriate selector. Skip.
739 *
740 * Entering area of "sysdeps".
741 *
742 * 3. If state is not valid, selector is temporary, it selects
743 * only session which triggered previous resolution. Key
744 * manager will do something to install a state with proper
745 * selector.
746 */
747 if (x->km.state == XFRM_STATE_VALID) {
748 if ((x->sel.family &&
749 !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
750 !security_xfrm_state_pol_flow_match(x, pol, fl))
751 return;
752
753 if (!*best ||
754 (*best)->km.dying > x->km.dying ||
755 ((*best)->km.dying == x->km.dying &&
756 (*best)->curlft.add_time < x->curlft.add_time))
757 *best = x;
758 } else if (x->km.state == XFRM_STATE_ACQ) {
759 *acq_in_progress = 1;
760 } else if (x->km.state == XFRM_STATE_ERROR ||
761 x->km.state == XFRM_STATE_EXPIRED) {
762 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
763 security_xfrm_state_pol_flow_match(x, pol, fl))
764 *error = -ESRCH;
765 }
766 }
767
768 struct xfrm_state *
769 xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
770 struct flowi *fl, struct xfrm_tmpl *tmpl,
771 struct xfrm_policy *pol, int *err,
772 unsigned short family)
773 {
774 static xfrm_address_t saddr_wildcard = { };
775 struct net *net = xp_net(pol);
776 unsigned int h, h_wildcard;
777 struct hlist_node *entry;
778 struct xfrm_state *x, *x0, *to_put;
779 int acquire_in_progress = 0;
780 int error = 0;
781 struct xfrm_state *best = NULL;
782
783 to_put = NULL;
784
785 spin_lock_bh(&xfrm_state_lock);
786 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, family);
787 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
788 if (x->props.family == family &&
789 x->props.reqid == tmpl->reqid &&
790 !(x->props.flags & XFRM_STATE_WILDRECV) &&
791 xfrm_state_addr_check(x, daddr, saddr, family) &&
792 tmpl->mode == x->props.mode &&
793 tmpl->id.proto == x->id.proto &&
794 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
795 xfrm_state_look_at(pol, x, fl, family, daddr, saddr,
796 &best, &acquire_in_progress, &error);
797 }
798 if (best)
799 goto found;
800
801 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, family);
802 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) {
803 if (x->props.family == family &&
804 x->props.reqid == tmpl->reqid &&
805 !(x->props.flags & XFRM_STATE_WILDRECV) &&
806 xfrm_state_addr_check(x, daddr, saddr, family) &&
807 tmpl->mode == x->props.mode &&
808 tmpl->id.proto == x->id.proto &&
809 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
810 xfrm_state_look_at(pol, x, fl, family, daddr, saddr,
811 &best, &acquire_in_progress, &error);
812 }
813
814 found:
815 x = best;
816 if (!x && !error && !acquire_in_progress) {
817 if (tmpl->id.spi &&
818 (x0 = __xfrm_state_lookup(net, daddr, tmpl->id.spi,
819 tmpl->id.proto, family)) != NULL) {
820 to_put = x0;
821 error = -EEXIST;
822 goto out;
823 }
824 x = xfrm_state_alloc(net);
825 if (x == NULL) {
826 error = -ENOMEM;
827 goto out;
828 }
829 /* Initialize temporary selector matching only
830 * to current session. */
831 xfrm_init_tempsel(x, fl, tmpl, daddr, saddr, family);
832
833 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->secid);
834 if (error) {
835 x->km.state = XFRM_STATE_DEAD;
836 to_put = x;
837 x = NULL;
838 goto out;
839 }
840
841 if (km_query(x, tmpl, pol) == 0) {
842 x->km.state = XFRM_STATE_ACQ;
843 list_add(&x->km.all, &net->xfrm.state_all);
844 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
845 h = xfrm_src_hash(net, daddr, saddr, family);
846 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
847 if (x->id.spi) {
848 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, family);
849 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
850 }
851 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
852 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
853 net->xfrm.state_num++;
854 xfrm_hash_grow_check(net, x->bydst.next != NULL);
855 } else {
856 x->km.state = XFRM_STATE_DEAD;
857 to_put = x;
858 x = NULL;
859 error = -ESRCH;
860 }
861 }
862 out:
863 if (x)
864 xfrm_state_hold(x);
865 else
866 *err = acquire_in_progress ? -EAGAIN : error;
867 spin_unlock_bh(&xfrm_state_lock);
868 if (to_put)
869 xfrm_state_put(to_put);
870 return x;
871 }
872
873 struct xfrm_state *
874 xfrm_stateonly_find(struct net *net,
875 xfrm_address_t *daddr, xfrm_address_t *saddr,
876 unsigned short family, u8 mode, u8 proto, u32 reqid)
877 {
878 unsigned int h;
879 struct xfrm_state *rx = NULL, *x = NULL;
880 struct hlist_node *entry;
881
882 spin_lock(&xfrm_state_lock);
883 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
884 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
885 if (x->props.family == family &&
886 x->props.reqid == reqid &&
887 !(x->props.flags & XFRM_STATE_WILDRECV) &&
888 xfrm_state_addr_check(x, daddr, saddr, family) &&
889 mode == x->props.mode &&
890 proto == x->id.proto &&
891 x->km.state == XFRM_STATE_VALID) {
892 rx = x;
893 break;
894 }
895 }
896
897 if (rx)
898 xfrm_state_hold(rx);
899 spin_unlock(&xfrm_state_lock);
900
901
902 return rx;
903 }
904 EXPORT_SYMBOL(xfrm_stateonly_find);
905
906 static void __xfrm_state_insert(struct xfrm_state *x)
907 {
908 struct net *net = xs_net(x);
909 unsigned int h;
910
911 x->genid = ++xfrm_state_genid;
912
913 list_add(&x->km.all, &net->xfrm.state_all);
914
915 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
916 x->props.reqid, x->props.family);
917 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
918
919 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
920 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
921
922 if (x->id.spi) {
923 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
924 x->props.family);
925
926 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
927 }
928
929 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
930 if (x->replay_maxage)
931 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
932
933 wake_up(&net->xfrm.km_waitq);
934
935 net->xfrm.state_num++;
936
937 xfrm_hash_grow_check(net, x->bydst.next != NULL);
938 }
939
940 /* xfrm_state_lock is held */
941 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
942 {
943 struct net *net = xs_net(xnew);
944 unsigned short family = xnew->props.family;
945 u32 reqid = xnew->props.reqid;
946 struct xfrm_state *x;
947 struct hlist_node *entry;
948 unsigned int h;
949
950 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
951 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
952 if (x->props.family == family &&
953 x->props.reqid == reqid &&
954 !xfrm_addr_cmp(&x->id.daddr, &xnew->id.daddr, family) &&
955 !xfrm_addr_cmp(&x->props.saddr, &xnew->props.saddr, family))
956 x->genid = xfrm_state_genid;
957 }
958 }
959
960 void xfrm_state_insert(struct xfrm_state *x)
961 {
962 spin_lock_bh(&xfrm_state_lock);
963 __xfrm_state_bump_genids(x);
964 __xfrm_state_insert(x);
965 spin_unlock_bh(&xfrm_state_lock);
966 }
967 EXPORT_SYMBOL(xfrm_state_insert);
968
969 /* xfrm_state_lock is held */
970 static struct xfrm_state *__find_acq_core(struct net *net, unsigned short family, u8 mode, u32 reqid, u8 proto, xfrm_address_t *daddr, xfrm_address_t *saddr, int create)
971 {
972 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
973 struct hlist_node *entry;
974 struct xfrm_state *x;
975
976 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
977 if (x->props.reqid != reqid ||
978 x->props.mode != mode ||
979 x->props.family != family ||
980 x->km.state != XFRM_STATE_ACQ ||
981 x->id.spi != 0 ||
982 x->id.proto != proto ||
983 xfrm_addr_cmp(&x->id.daddr, daddr, family) ||
984 xfrm_addr_cmp(&x->props.saddr, saddr, family))
985 continue;
986
987 xfrm_state_hold(x);
988 return x;
989 }
990
991 if (!create)
992 return NULL;
993
994 x = xfrm_state_alloc(net);
995 if (likely(x)) {
996 switch (family) {
997 case AF_INET:
998 x->sel.daddr.a4 = daddr->a4;
999 x->sel.saddr.a4 = saddr->a4;
1000 x->sel.prefixlen_d = 32;
1001 x->sel.prefixlen_s = 32;
1002 x->props.saddr.a4 = saddr->a4;
1003 x->id.daddr.a4 = daddr->a4;
1004 break;
1005
1006 case AF_INET6:
1007 ipv6_addr_copy((struct in6_addr *)x->sel.daddr.a6,
1008 (struct in6_addr *)daddr);
1009 ipv6_addr_copy((struct in6_addr *)x->sel.saddr.a6,
1010 (struct in6_addr *)saddr);
1011 x->sel.prefixlen_d = 128;
1012 x->sel.prefixlen_s = 128;
1013 ipv6_addr_copy((struct in6_addr *)x->props.saddr.a6,
1014 (struct in6_addr *)saddr);
1015 ipv6_addr_copy((struct in6_addr *)x->id.daddr.a6,
1016 (struct in6_addr *)daddr);
1017 break;
1018 }
1019
1020 x->km.state = XFRM_STATE_ACQ;
1021 x->id.proto = proto;
1022 x->props.family = family;
1023 x->props.mode = mode;
1024 x->props.reqid = reqid;
1025 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1026 xfrm_state_hold(x);
1027 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1028 list_add(&x->km.all, &net->xfrm.state_all);
1029 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1030 h = xfrm_src_hash(net, daddr, saddr, family);
1031 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1032
1033 net->xfrm.state_num++;
1034
1035 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1036 }
1037
1038 return x;
1039 }
1040
1041 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq);
1042
1043 int xfrm_state_add(struct xfrm_state *x)
1044 {
1045 struct net *net = xs_net(x);
1046 struct xfrm_state *x1, *to_put;
1047 int family;
1048 int err;
1049 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1050
1051 family = x->props.family;
1052
1053 to_put = NULL;
1054
1055 spin_lock_bh(&xfrm_state_lock);
1056
1057 x1 = __xfrm_state_locate(x, use_spi, family);
1058 if (x1) {
1059 to_put = x1;
1060 x1 = NULL;
1061 err = -EEXIST;
1062 goto out;
1063 }
1064
1065 if (use_spi && x->km.seq) {
1066 x1 = __xfrm_find_acq_byseq(net, x->km.seq);
1067 if (x1 && ((x1->id.proto != x->id.proto) ||
1068 xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family))) {
1069 to_put = x1;
1070 x1 = NULL;
1071 }
1072 }
1073
1074 if (use_spi && !x1)
1075 x1 = __find_acq_core(net, family, x->props.mode, x->props.reqid,
1076 x->id.proto,
1077 &x->id.daddr, &x->props.saddr, 0);
1078
1079 __xfrm_state_bump_genids(x);
1080 __xfrm_state_insert(x);
1081 err = 0;
1082
1083 out:
1084 spin_unlock_bh(&xfrm_state_lock);
1085
1086 if (x1) {
1087 xfrm_state_delete(x1);
1088 xfrm_state_put(x1);
1089 }
1090
1091 if (to_put)
1092 xfrm_state_put(to_put);
1093
1094 return err;
1095 }
1096 EXPORT_SYMBOL(xfrm_state_add);
1097
1098 #ifdef CONFIG_XFRM_MIGRATE
1099 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1100 {
1101 struct net *net = xs_net(orig);
1102 int err = -ENOMEM;
1103 struct xfrm_state *x = xfrm_state_alloc(net);
1104 if (!x)
1105 goto error;
1106
1107 memcpy(&x->id, &orig->id, sizeof(x->id));
1108 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1109 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1110 x->props.mode = orig->props.mode;
1111 x->props.replay_window = orig->props.replay_window;
1112 x->props.reqid = orig->props.reqid;
1113 x->props.family = orig->props.family;
1114 x->props.saddr = orig->props.saddr;
1115
1116 if (orig->aalg) {
1117 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1118 if (!x->aalg)
1119 goto error;
1120 }
1121 x->props.aalgo = orig->props.aalgo;
1122
1123 if (orig->ealg) {
1124 x->ealg = xfrm_algo_clone(orig->ealg);
1125 if (!x->ealg)
1126 goto error;
1127 }
1128 x->props.ealgo = orig->props.ealgo;
1129
1130 if (orig->calg) {
1131 x->calg = xfrm_algo_clone(orig->calg);
1132 if (!x->calg)
1133 goto error;
1134 }
1135 x->props.calgo = orig->props.calgo;
1136
1137 if (orig->encap) {
1138 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1139 if (!x->encap)
1140 goto error;
1141 }
1142
1143 if (orig->coaddr) {
1144 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1145 GFP_KERNEL);
1146 if (!x->coaddr)
1147 goto error;
1148 }
1149
1150 err = xfrm_init_state(x);
1151 if (err)
1152 goto error;
1153
1154 x->props.flags = orig->props.flags;
1155
1156 x->curlft.add_time = orig->curlft.add_time;
1157 x->km.state = orig->km.state;
1158 x->km.seq = orig->km.seq;
1159
1160 return x;
1161
1162 error:
1163 if (errp)
1164 *errp = err;
1165 if (x) {
1166 kfree(x->aalg);
1167 kfree(x->ealg);
1168 kfree(x->calg);
1169 kfree(x->encap);
1170 kfree(x->coaddr);
1171 }
1172 kfree(x);
1173 return NULL;
1174 }
1175
1176 /* xfrm_state_lock is held */
1177 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1178 {
1179 unsigned int h;
1180 struct xfrm_state *x;
1181 struct hlist_node *entry;
1182
1183 if (m->reqid) {
1184 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1185 m->reqid, m->old_family);
1186 hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) {
1187 if (x->props.mode != m->mode ||
1188 x->id.proto != m->proto)
1189 continue;
1190 if (m->reqid && x->props.reqid != m->reqid)
1191 continue;
1192 if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1193 m->old_family) ||
1194 xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1195 m->old_family))
1196 continue;
1197 xfrm_state_hold(x);
1198 return x;
1199 }
1200 } else {
1201 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1202 m->old_family);
1203 hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) {
1204 if (x->props.mode != m->mode ||
1205 x->id.proto != m->proto)
1206 continue;
1207 if (xfrm_addr_cmp(&x->id.daddr, &m->old_daddr,
1208 m->old_family) ||
1209 xfrm_addr_cmp(&x->props.saddr, &m->old_saddr,
1210 m->old_family))
1211 continue;
1212 xfrm_state_hold(x);
1213 return x;
1214 }
1215 }
1216
1217 return NULL;
1218 }
1219 EXPORT_SYMBOL(xfrm_migrate_state_find);
1220
1221 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1222 struct xfrm_migrate *m)
1223 {
1224 struct xfrm_state *xc;
1225 int err;
1226
1227 xc = xfrm_state_clone(x, &err);
1228 if (!xc)
1229 return NULL;
1230
1231 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1232 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1233
1234 /* add state */
1235 if (!xfrm_addr_cmp(&x->id.daddr, &m->new_daddr, m->new_family)) {
1236 /* a care is needed when the destination address of the
1237 state is to be updated as it is a part of triplet */
1238 xfrm_state_insert(xc);
1239 } else {
1240 if ((err = xfrm_state_add(xc)) < 0)
1241 goto error;
1242 }
1243
1244 return xc;
1245 error:
1246 kfree(xc);
1247 return NULL;
1248 }
1249 EXPORT_SYMBOL(xfrm_state_migrate);
1250 #endif
1251
1252 int xfrm_state_update(struct xfrm_state *x)
1253 {
1254 struct xfrm_state *x1, *to_put;
1255 int err;
1256 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1257
1258 to_put = NULL;
1259
1260 spin_lock_bh(&xfrm_state_lock);
1261 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1262
1263 err = -ESRCH;
1264 if (!x1)
1265 goto out;
1266
1267 if (xfrm_state_kern(x1)) {
1268 to_put = x1;
1269 err = -EEXIST;
1270 goto out;
1271 }
1272
1273 if (x1->km.state == XFRM_STATE_ACQ) {
1274 __xfrm_state_insert(x);
1275 x = NULL;
1276 }
1277 err = 0;
1278
1279 out:
1280 spin_unlock_bh(&xfrm_state_lock);
1281
1282 if (to_put)
1283 xfrm_state_put(to_put);
1284
1285 if (err)
1286 return err;
1287
1288 if (!x) {
1289 xfrm_state_delete(x1);
1290 xfrm_state_put(x1);
1291 return 0;
1292 }
1293
1294 err = -EINVAL;
1295 spin_lock_bh(&x1->lock);
1296 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1297 if (x->encap && x1->encap)
1298 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1299 if (x->coaddr && x1->coaddr) {
1300 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1301 }
1302 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1303 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1304 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1305 x1->km.dying = 0;
1306
1307 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1308 if (x1->curlft.use_time)
1309 xfrm_state_check_expire(x1);
1310
1311 err = 0;
1312 }
1313 spin_unlock_bh(&x1->lock);
1314
1315 xfrm_state_put(x1);
1316
1317 return err;
1318 }
1319 EXPORT_SYMBOL(xfrm_state_update);
1320
1321 int xfrm_state_check_expire(struct xfrm_state *x)
1322 {
1323 if (!x->curlft.use_time)
1324 x->curlft.use_time = get_seconds();
1325
1326 if (x->km.state != XFRM_STATE_VALID)
1327 return -EINVAL;
1328
1329 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1330 x->curlft.packets >= x->lft.hard_packet_limit) {
1331 x->km.state = XFRM_STATE_EXPIRED;
1332 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
1333 return -EINVAL;
1334 }
1335
1336 if (!x->km.dying &&
1337 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1338 x->curlft.packets >= x->lft.soft_packet_limit)) {
1339 x->km.dying = 1;
1340 km_state_expired(x, 0, 0);
1341 }
1342 return 0;
1343 }
1344 EXPORT_SYMBOL(xfrm_state_check_expire);
1345
1346 struct xfrm_state *
1347 xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto,
1348 unsigned short family)
1349 {
1350 struct xfrm_state *x;
1351
1352 spin_lock_bh(&xfrm_state_lock);
1353 x = __xfrm_state_lookup(net, daddr, spi, proto, family);
1354 spin_unlock_bh(&xfrm_state_lock);
1355 return x;
1356 }
1357 EXPORT_SYMBOL(xfrm_state_lookup);
1358
1359 struct xfrm_state *
1360 xfrm_state_lookup_byaddr(struct net *net,
1361 xfrm_address_t *daddr, xfrm_address_t *saddr,
1362 u8 proto, unsigned short family)
1363 {
1364 struct xfrm_state *x;
1365
1366 spin_lock_bh(&xfrm_state_lock);
1367 x = __xfrm_state_lookup_byaddr(net, daddr, saddr, proto, family);
1368 spin_unlock_bh(&xfrm_state_lock);
1369 return x;
1370 }
1371 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1372
1373 struct xfrm_state *
1374 xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
1375 xfrm_address_t *daddr, xfrm_address_t *saddr,
1376 int create, unsigned short family)
1377 {
1378 struct xfrm_state *x;
1379
1380 spin_lock_bh(&xfrm_state_lock);
1381 x = __find_acq_core(net, family, mode, reqid, proto, daddr, saddr, create);
1382 spin_unlock_bh(&xfrm_state_lock);
1383
1384 return x;
1385 }
1386 EXPORT_SYMBOL(xfrm_find_acq);
1387
1388 #ifdef CONFIG_XFRM_SUB_POLICY
1389 int
1390 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1391 unsigned short family)
1392 {
1393 int err = 0;
1394 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1395 if (!afinfo)
1396 return -EAFNOSUPPORT;
1397
1398 spin_lock_bh(&xfrm_state_lock);
1399 if (afinfo->tmpl_sort)
1400 err = afinfo->tmpl_sort(dst, src, n);
1401 spin_unlock_bh(&xfrm_state_lock);
1402 xfrm_state_put_afinfo(afinfo);
1403 return err;
1404 }
1405 EXPORT_SYMBOL(xfrm_tmpl_sort);
1406
1407 int
1408 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1409 unsigned short family)
1410 {
1411 int err = 0;
1412 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1413 if (!afinfo)
1414 return -EAFNOSUPPORT;
1415
1416 spin_lock_bh(&xfrm_state_lock);
1417 if (afinfo->state_sort)
1418 err = afinfo->state_sort(dst, src, n);
1419 spin_unlock_bh(&xfrm_state_lock);
1420 xfrm_state_put_afinfo(afinfo);
1421 return err;
1422 }
1423 EXPORT_SYMBOL(xfrm_state_sort);
1424 #endif
1425
1426 /* Silly enough, but I'm lazy to build resolution list */
1427
1428 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 seq)
1429 {
1430 int i;
1431
1432 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1433 struct hlist_node *entry;
1434 struct xfrm_state *x;
1435
1436 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
1437 if (x->km.seq == seq &&
1438 x->km.state == XFRM_STATE_ACQ) {
1439 xfrm_state_hold(x);
1440 return x;
1441 }
1442 }
1443 }
1444 return NULL;
1445 }
1446
1447 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq)
1448 {
1449 struct xfrm_state *x;
1450
1451 spin_lock_bh(&xfrm_state_lock);
1452 x = __xfrm_find_acq_byseq(net, seq);
1453 spin_unlock_bh(&xfrm_state_lock);
1454 return x;
1455 }
1456 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1457
1458 u32 xfrm_get_acqseq(void)
1459 {
1460 u32 res;
1461 static u32 acqseq;
1462 static DEFINE_SPINLOCK(acqseq_lock);
1463
1464 spin_lock_bh(&acqseq_lock);
1465 res = (++acqseq ? : ++acqseq);
1466 spin_unlock_bh(&acqseq_lock);
1467 return res;
1468 }
1469 EXPORT_SYMBOL(xfrm_get_acqseq);
1470
1471 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1472 {
1473 struct net *net = xs_net(x);
1474 unsigned int h;
1475 struct xfrm_state *x0;
1476 int err = -ENOENT;
1477 __be32 minspi = htonl(low);
1478 __be32 maxspi = htonl(high);
1479
1480 spin_lock_bh(&x->lock);
1481 if (x->km.state == XFRM_STATE_DEAD)
1482 goto unlock;
1483
1484 err = 0;
1485 if (x->id.spi)
1486 goto unlock;
1487
1488 err = -ENOENT;
1489
1490 if (minspi == maxspi) {
1491 x0 = xfrm_state_lookup(net, &x->id.daddr, minspi, x->id.proto, x->props.family);
1492 if (x0) {
1493 xfrm_state_put(x0);
1494 goto unlock;
1495 }
1496 x->id.spi = minspi;
1497 } else {
1498 u32 spi = 0;
1499 for (h=0; h<high-low+1; h++) {
1500 spi = low + net_random()%(high-low+1);
1501 x0 = xfrm_state_lookup(net, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1502 if (x0 == NULL) {
1503 x->id.spi = htonl(spi);
1504 break;
1505 }
1506 xfrm_state_put(x0);
1507 }
1508 }
1509 if (x->id.spi) {
1510 spin_lock_bh(&xfrm_state_lock);
1511 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1512 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1513 spin_unlock_bh(&xfrm_state_lock);
1514
1515 err = 0;
1516 }
1517
1518 unlock:
1519 spin_unlock_bh(&x->lock);
1520
1521 return err;
1522 }
1523 EXPORT_SYMBOL(xfrm_alloc_spi);
1524
1525 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1526 int (*func)(struct xfrm_state *, int, void*),
1527 void *data)
1528 {
1529 struct xfrm_state *state;
1530 struct xfrm_state_walk *x;
1531 int err = 0;
1532
1533 if (walk->seq != 0 && list_empty(&walk->all))
1534 return 0;
1535
1536 spin_lock_bh(&xfrm_state_lock);
1537 if (list_empty(&walk->all))
1538 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1539 else
1540 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1541 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1542 if (x->state == XFRM_STATE_DEAD)
1543 continue;
1544 state = container_of(x, struct xfrm_state, km);
1545 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1546 continue;
1547 err = func(state, walk->seq, data);
1548 if (err) {
1549 list_move_tail(&walk->all, &x->all);
1550 goto out;
1551 }
1552 walk->seq++;
1553 }
1554 if (walk->seq == 0) {
1555 err = -ENOENT;
1556 goto out;
1557 }
1558 list_del_init(&walk->all);
1559 out:
1560 spin_unlock_bh(&xfrm_state_lock);
1561 return err;
1562 }
1563 EXPORT_SYMBOL(xfrm_state_walk);
1564
1565 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1566 {
1567 INIT_LIST_HEAD(&walk->all);
1568 walk->proto = proto;
1569 walk->state = XFRM_STATE_DEAD;
1570 walk->seq = 0;
1571 }
1572 EXPORT_SYMBOL(xfrm_state_walk_init);
1573
1574 void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1575 {
1576 if (list_empty(&walk->all))
1577 return;
1578
1579 spin_lock_bh(&xfrm_state_lock);
1580 list_del(&walk->all);
1581 spin_unlock_bh(&xfrm_state_lock);
1582 }
1583 EXPORT_SYMBOL(xfrm_state_walk_done);
1584
1585
1586 void xfrm_replay_notify(struct xfrm_state *x, int event)
1587 {
1588 struct km_event c;
1589 /* we send notify messages in case
1590 * 1. we updated on of the sequence numbers, and the seqno difference
1591 * is at least x->replay_maxdiff, in this case we also update the
1592 * timeout of our timer function
1593 * 2. if x->replay_maxage has elapsed since last update,
1594 * and there were changes
1595 *
1596 * The state structure must be locked!
1597 */
1598
1599 switch (event) {
1600 case XFRM_REPLAY_UPDATE:
1601 if (x->replay_maxdiff &&
1602 (x->replay.seq - x->preplay.seq < x->replay_maxdiff) &&
1603 (x->replay.oseq - x->preplay.oseq < x->replay_maxdiff)) {
1604 if (x->xflags & XFRM_TIME_DEFER)
1605 event = XFRM_REPLAY_TIMEOUT;
1606 else
1607 return;
1608 }
1609
1610 break;
1611
1612 case XFRM_REPLAY_TIMEOUT:
1613 if ((x->replay.seq == x->preplay.seq) &&
1614 (x->replay.bitmap == x->preplay.bitmap) &&
1615 (x->replay.oseq == x->preplay.oseq)) {
1616 x->xflags |= XFRM_TIME_DEFER;
1617 return;
1618 }
1619
1620 break;
1621 }
1622
1623 memcpy(&x->preplay, &x->replay, sizeof(struct xfrm_replay_state));
1624 c.event = XFRM_MSG_NEWAE;
1625 c.data.aevent = event;
1626 km_state_notify(x, &c);
1627
1628 if (x->replay_maxage &&
1629 !mod_timer(&x->rtimer, jiffies + x->replay_maxage))
1630 x->xflags &= ~XFRM_TIME_DEFER;
1631 }
1632
1633 static void xfrm_replay_timer_handler(unsigned long data)
1634 {
1635 struct xfrm_state *x = (struct xfrm_state*)data;
1636
1637 spin_lock(&x->lock);
1638
1639 if (x->km.state == XFRM_STATE_VALID) {
1640 if (xfrm_aevent_is_on(xs_net(x)))
1641 xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
1642 else
1643 x->xflags |= XFRM_TIME_DEFER;
1644 }
1645
1646 spin_unlock(&x->lock);
1647 }
1648
1649 int xfrm_replay_check(struct xfrm_state *x,
1650 struct sk_buff *skb, __be32 net_seq)
1651 {
1652 u32 diff;
1653 u32 seq = ntohl(net_seq);
1654
1655 if (unlikely(seq == 0))
1656 goto err;
1657
1658 if (likely(seq > x->replay.seq))
1659 return 0;
1660
1661 diff = x->replay.seq - seq;
1662 if (diff >= min_t(unsigned int, x->props.replay_window,
1663 sizeof(x->replay.bitmap) * 8)) {
1664 x->stats.replay_window++;
1665 goto err;
1666 }
1667
1668 if (x->replay.bitmap & (1U << diff)) {
1669 x->stats.replay++;
1670 goto err;
1671 }
1672 return 0;
1673
1674 err:
1675 xfrm_audit_state_replay(x, skb, net_seq);
1676 return -EINVAL;
1677 }
1678
1679 void xfrm_replay_advance(struct xfrm_state *x, __be32 net_seq)
1680 {
1681 u32 diff;
1682 u32 seq = ntohl(net_seq);
1683
1684 if (seq > x->replay.seq) {
1685 diff = seq - x->replay.seq;
1686 if (diff < x->props.replay_window)
1687 x->replay.bitmap = ((x->replay.bitmap) << diff) | 1;
1688 else
1689 x->replay.bitmap = 1;
1690 x->replay.seq = seq;
1691 } else {
1692 diff = x->replay.seq - seq;
1693 x->replay.bitmap |= (1U << diff);
1694 }
1695
1696 if (xfrm_aevent_is_on(xs_net(x)))
1697 xfrm_replay_notify(x, XFRM_REPLAY_UPDATE);
1698 }
1699
1700 static LIST_HEAD(xfrm_km_list);
1701 static DEFINE_RWLOCK(xfrm_km_lock);
1702
1703 void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1704 {
1705 struct xfrm_mgr *km;
1706
1707 read_lock(&xfrm_km_lock);
1708 list_for_each_entry(km, &xfrm_km_list, list)
1709 if (km->notify_policy)
1710 km->notify_policy(xp, dir, c);
1711 read_unlock(&xfrm_km_lock);
1712 }
1713
1714 void km_state_notify(struct xfrm_state *x, struct km_event *c)
1715 {
1716 struct xfrm_mgr *km;
1717 read_lock(&xfrm_km_lock);
1718 list_for_each_entry(km, &xfrm_km_list, list)
1719 if (km->notify)
1720 km->notify(x, c);
1721 read_unlock(&xfrm_km_lock);
1722 }
1723
1724 EXPORT_SYMBOL(km_policy_notify);
1725 EXPORT_SYMBOL(km_state_notify);
1726
1727 void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
1728 {
1729 struct net *net = xs_net(x);
1730 struct km_event c;
1731
1732 c.data.hard = hard;
1733 c.pid = pid;
1734 c.event = XFRM_MSG_EXPIRE;
1735 km_state_notify(x, &c);
1736
1737 if (hard)
1738 wake_up(&net->xfrm.km_waitq);
1739 }
1740
1741 EXPORT_SYMBOL(km_state_expired);
1742 /*
1743 * We send to all registered managers regardless of failure
1744 * We are happy with one success
1745 */
1746 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1747 {
1748 int err = -EINVAL, acqret;
1749 struct xfrm_mgr *km;
1750
1751 read_lock(&xfrm_km_lock);
1752 list_for_each_entry(km, &xfrm_km_list, list) {
1753 acqret = km->acquire(x, t, pol, XFRM_POLICY_OUT);
1754 if (!acqret)
1755 err = acqret;
1756 }
1757 read_unlock(&xfrm_km_lock);
1758 return err;
1759 }
1760 EXPORT_SYMBOL(km_query);
1761
1762 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1763 {
1764 int err = -EINVAL;
1765 struct xfrm_mgr *km;
1766
1767 read_lock(&xfrm_km_lock);
1768 list_for_each_entry(km, &xfrm_km_list, list) {
1769 if (km->new_mapping)
1770 err = km->new_mapping(x, ipaddr, sport);
1771 if (!err)
1772 break;
1773 }
1774 read_unlock(&xfrm_km_lock);
1775 return err;
1776 }
1777 EXPORT_SYMBOL(km_new_mapping);
1778
1779 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
1780 {
1781 struct net *net = xp_net(pol);
1782 struct km_event c;
1783
1784 c.data.hard = hard;
1785 c.pid = pid;
1786 c.event = XFRM_MSG_POLEXPIRE;
1787 km_policy_notify(pol, dir, &c);
1788
1789 if (hard)
1790 wake_up(&net->xfrm.km_waitq);
1791 }
1792 EXPORT_SYMBOL(km_policy_expired);
1793
1794 #ifdef CONFIG_XFRM_MIGRATE
1795 int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1796 struct xfrm_migrate *m, int num_migrate,
1797 struct xfrm_kmaddress *k)
1798 {
1799 int err = -EINVAL;
1800 int ret;
1801 struct xfrm_mgr *km;
1802
1803 read_lock(&xfrm_km_lock);
1804 list_for_each_entry(km, &xfrm_km_list, list) {
1805 if (km->migrate) {
1806 ret = km->migrate(sel, dir, type, m, num_migrate, k);
1807 if (!ret)
1808 err = ret;
1809 }
1810 }
1811 read_unlock(&xfrm_km_lock);
1812 return err;
1813 }
1814 EXPORT_SYMBOL(km_migrate);
1815 #endif
1816
1817 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1818 {
1819 int err = -EINVAL;
1820 int ret;
1821 struct xfrm_mgr *km;
1822
1823 read_lock(&xfrm_km_lock);
1824 list_for_each_entry(km, &xfrm_km_list, list) {
1825 if (km->report) {
1826 ret = km->report(net, proto, sel, addr);
1827 if (!ret)
1828 err = ret;
1829 }
1830 }
1831 read_unlock(&xfrm_km_lock);
1832 return err;
1833 }
1834 EXPORT_SYMBOL(km_report);
1835
1836 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1837 {
1838 int err;
1839 u8 *data;
1840 struct xfrm_mgr *km;
1841 struct xfrm_policy *pol = NULL;
1842
1843 if (optlen <= 0 || optlen > PAGE_SIZE)
1844 return -EMSGSIZE;
1845
1846 data = kmalloc(optlen, GFP_KERNEL);
1847 if (!data)
1848 return -ENOMEM;
1849
1850 err = -EFAULT;
1851 if (copy_from_user(data, optval, optlen))
1852 goto out;
1853
1854 err = -EINVAL;
1855 read_lock(&xfrm_km_lock);
1856 list_for_each_entry(km, &xfrm_km_list, list) {
1857 pol = km->compile_policy(sk, optname, data,
1858 optlen, &err);
1859 if (err >= 0)
1860 break;
1861 }
1862 read_unlock(&xfrm_km_lock);
1863
1864 if (err >= 0) {
1865 xfrm_sk_policy_insert(sk, err, pol);
1866 xfrm_pol_put(pol);
1867 err = 0;
1868 }
1869
1870 out:
1871 kfree(data);
1872 return err;
1873 }
1874 EXPORT_SYMBOL(xfrm_user_policy);
1875
1876 int xfrm_register_km(struct xfrm_mgr *km)
1877 {
1878 write_lock_bh(&xfrm_km_lock);
1879 list_add_tail(&km->list, &xfrm_km_list);
1880 write_unlock_bh(&xfrm_km_lock);
1881 return 0;
1882 }
1883 EXPORT_SYMBOL(xfrm_register_km);
1884
1885 int xfrm_unregister_km(struct xfrm_mgr *km)
1886 {
1887 write_lock_bh(&xfrm_km_lock);
1888 list_del(&km->list);
1889 write_unlock_bh(&xfrm_km_lock);
1890 return 0;
1891 }
1892 EXPORT_SYMBOL(xfrm_unregister_km);
1893
1894 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1895 {
1896 int err = 0;
1897 if (unlikely(afinfo == NULL))
1898 return -EINVAL;
1899 if (unlikely(afinfo->family >= NPROTO))
1900 return -EAFNOSUPPORT;
1901 write_lock_bh(&xfrm_state_afinfo_lock);
1902 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1903 err = -ENOBUFS;
1904 else
1905 xfrm_state_afinfo[afinfo->family] = afinfo;
1906 write_unlock_bh(&xfrm_state_afinfo_lock);
1907 return err;
1908 }
1909 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1910
1911 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1912 {
1913 int err = 0;
1914 if (unlikely(afinfo == NULL))
1915 return -EINVAL;
1916 if (unlikely(afinfo->family >= NPROTO))
1917 return -EAFNOSUPPORT;
1918 write_lock_bh(&xfrm_state_afinfo_lock);
1919 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1920 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1921 err = -EINVAL;
1922 else
1923 xfrm_state_afinfo[afinfo->family] = NULL;
1924 }
1925 write_unlock_bh(&xfrm_state_afinfo_lock);
1926 return err;
1927 }
1928 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1929
1930 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1931 {
1932 struct xfrm_state_afinfo *afinfo;
1933 if (unlikely(family >= NPROTO))
1934 return NULL;
1935 read_lock(&xfrm_state_afinfo_lock);
1936 afinfo = xfrm_state_afinfo[family];
1937 if (unlikely(!afinfo))
1938 read_unlock(&xfrm_state_afinfo_lock);
1939 return afinfo;
1940 }
1941
1942 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1943 __releases(xfrm_state_afinfo_lock)
1944 {
1945 read_unlock(&xfrm_state_afinfo_lock);
1946 }
1947
1948 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1949 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1950 {
1951 if (x->tunnel) {
1952 struct xfrm_state *t = x->tunnel;
1953
1954 if (atomic_read(&t->tunnel_users) == 2)
1955 xfrm_state_delete(t);
1956 atomic_dec(&t->tunnel_users);
1957 xfrm_state_put(t);
1958 x->tunnel = NULL;
1959 }
1960 }
1961 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1962
1963 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1964 {
1965 int res;
1966
1967 spin_lock_bh(&x->lock);
1968 if (x->km.state == XFRM_STATE_VALID &&
1969 x->type && x->type->get_mtu)
1970 res = x->type->get_mtu(x, mtu);
1971 else
1972 res = mtu - x->props.header_len;
1973 spin_unlock_bh(&x->lock);
1974 return res;
1975 }
1976
1977 int xfrm_init_state(struct xfrm_state *x)
1978 {
1979 struct xfrm_state_afinfo *afinfo;
1980 struct xfrm_mode *inner_mode;
1981 int family = x->props.family;
1982 int err;
1983
1984 err = -EAFNOSUPPORT;
1985 afinfo = xfrm_state_get_afinfo(family);
1986 if (!afinfo)
1987 goto error;
1988
1989 err = 0;
1990 if (afinfo->init_flags)
1991 err = afinfo->init_flags(x);
1992
1993 xfrm_state_put_afinfo(afinfo);
1994
1995 if (err)
1996 goto error;
1997
1998 err = -EPROTONOSUPPORT;
1999
2000 if (x->sel.family != AF_UNSPEC) {
2001 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2002 if (inner_mode == NULL)
2003 goto error;
2004
2005 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2006 family != x->sel.family) {
2007 xfrm_put_mode(inner_mode);
2008 goto error;
2009 }
2010
2011 x->inner_mode = inner_mode;
2012 } else {
2013 struct xfrm_mode *inner_mode_iaf;
2014 int iafamily = AF_INET;
2015
2016 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2017 if (inner_mode == NULL)
2018 goto error;
2019
2020 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2021 xfrm_put_mode(inner_mode);
2022 goto error;
2023 }
2024 x->inner_mode = inner_mode;
2025
2026 if (x->props.family == AF_INET)
2027 iafamily = AF_INET6;
2028
2029 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2030 if (inner_mode_iaf) {
2031 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2032 x->inner_mode_iaf = inner_mode_iaf;
2033 else
2034 xfrm_put_mode(inner_mode_iaf);
2035 }
2036 }
2037
2038 x->type = xfrm_get_type(x->id.proto, family);
2039 if (x->type == NULL)
2040 goto error;
2041
2042 err = x->type->init_state(x);
2043 if (err)
2044 goto error;
2045
2046 x->outer_mode = xfrm_get_mode(x->props.mode, family);
2047 if (x->outer_mode == NULL)
2048 goto error;
2049
2050 x->km.state = XFRM_STATE_VALID;
2051
2052 error:
2053 return err;
2054 }
2055
2056 EXPORT_SYMBOL(xfrm_init_state);
2057
2058 int __net_init xfrm_state_init(struct net *net)
2059 {
2060 unsigned int sz;
2061
2062 INIT_LIST_HEAD(&net->xfrm.state_all);
2063
2064 sz = sizeof(struct hlist_head) * 8;
2065
2066 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2067 if (!net->xfrm.state_bydst)
2068 goto out_bydst;
2069 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2070 if (!net->xfrm.state_bysrc)
2071 goto out_bysrc;
2072 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2073 if (!net->xfrm.state_byspi)
2074 goto out_byspi;
2075 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2076
2077 net->xfrm.state_num = 0;
2078 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2079 INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2080 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2081 init_waitqueue_head(&net->xfrm.km_waitq);
2082 return 0;
2083
2084 out_byspi:
2085 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2086 out_bysrc:
2087 xfrm_hash_free(net->xfrm.state_bydst, sz);
2088 out_bydst:
2089 return -ENOMEM;
2090 }
2091
2092 void xfrm_state_fini(struct net *net)
2093 {
2094 struct xfrm_audit audit_info;
2095 unsigned int sz;
2096
2097 flush_work(&net->xfrm.state_hash_work);
2098 audit_info.loginuid = -1;
2099 audit_info.sessionid = -1;
2100 audit_info.secid = 0;
2101 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2102 flush_work(&net->xfrm.state_gc_work);
2103
2104 WARN_ON(!list_empty(&net->xfrm.state_all));
2105
2106 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2107 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2108 xfrm_hash_free(net->xfrm.state_byspi, sz);
2109 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2110 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2111 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2112 xfrm_hash_free(net->xfrm.state_bydst, sz);
2113 }
2114
2115 #ifdef CONFIG_AUDITSYSCALL
2116 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2117 struct audit_buffer *audit_buf)
2118 {
2119 struct xfrm_sec_ctx *ctx = x->security;
2120 u32 spi = ntohl(x->id.spi);
2121
2122 if (ctx)
2123 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2124 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2125
2126 switch(x->props.family) {
2127 case AF_INET:
2128 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2129 &x->props.saddr.a4, &x->id.daddr.a4);
2130 break;
2131 case AF_INET6:
2132 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2133 x->props.saddr.a6, x->id.daddr.a6);
2134 break;
2135 }
2136
2137 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2138 }
2139
2140 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2141 struct audit_buffer *audit_buf)
2142 {
2143 struct iphdr *iph4;
2144 struct ipv6hdr *iph6;
2145
2146 switch (family) {
2147 case AF_INET:
2148 iph4 = ip_hdr(skb);
2149 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2150 &iph4->saddr, &iph4->daddr);
2151 break;
2152 case AF_INET6:
2153 iph6 = ipv6_hdr(skb);
2154 audit_log_format(audit_buf,
2155 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2156 &iph6->saddr,&iph6->daddr,
2157 iph6->flow_lbl[0] & 0x0f,
2158 iph6->flow_lbl[1],
2159 iph6->flow_lbl[2]);
2160 break;
2161 }
2162 }
2163
2164 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2165 uid_t auid, u32 sessionid, u32 secid)
2166 {
2167 struct audit_buffer *audit_buf;
2168
2169 audit_buf = xfrm_audit_start("SAD-add");
2170 if (audit_buf == NULL)
2171 return;
2172 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2173 xfrm_audit_helper_sainfo(x, audit_buf);
2174 audit_log_format(audit_buf, " res=%u", result);
2175 audit_log_end(audit_buf);
2176 }
2177 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2178
2179 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2180 uid_t auid, u32 sessionid, u32 secid)
2181 {
2182 struct audit_buffer *audit_buf;
2183
2184 audit_buf = xfrm_audit_start("SAD-delete");
2185 if (audit_buf == NULL)
2186 return;
2187 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2188 xfrm_audit_helper_sainfo(x, audit_buf);
2189 audit_log_format(audit_buf, " res=%u", result);
2190 audit_log_end(audit_buf);
2191 }
2192 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2193
2194 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2195 struct sk_buff *skb)
2196 {
2197 struct audit_buffer *audit_buf;
2198 u32 spi;
2199
2200 audit_buf = xfrm_audit_start("SA-replay-overflow");
2201 if (audit_buf == NULL)
2202 return;
2203 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2204 /* don't record the sequence number because it's inherent in this kind
2205 * of audit message */
2206 spi = ntohl(x->id.spi);
2207 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2208 audit_log_end(audit_buf);
2209 }
2210 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2211
2212 static void xfrm_audit_state_replay(struct xfrm_state *x,
2213 struct sk_buff *skb, __be32 net_seq)
2214 {
2215 struct audit_buffer *audit_buf;
2216 u32 spi;
2217
2218 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2219 if (audit_buf == NULL)
2220 return;
2221 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2222 spi = ntohl(x->id.spi);
2223 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2224 spi, spi, ntohl(net_seq));
2225 audit_log_end(audit_buf);
2226 }
2227
2228 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2229 {
2230 struct audit_buffer *audit_buf;
2231
2232 audit_buf = xfrm_audit_start("SA-notfound");
2233 if (audit_buf == NULL)
2234 return;
2235 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2236 audit_log_end(audit_buf);
2237 }
2238 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2239
2240 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2241 __be32 net_spi, __be32 net_seq)
2242 {
2243 struct audit_buffer *audit_buf;
2244 u32 spi;
2245
2246 audit_buf = xfrm_audit_start("SA-notfound");
2247 if (audit_buf == NULL)
2248 return;
2249 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2250 spi = ntohl(net_spi);
2251 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2252 spi, spi, ntohl(net_seq));
2253 audit_log_end(audit_buf);
2254 }
2255 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2256
2257 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2258 struct sk_buff *skb, u8 proto)
2259 {
2260 struct audit_buffer *audit_buf;
2261 __be32 net_spi;
2262 __be32 net_seq;
2263
2264 audit_buf = xfrm_audit_start("SA-icv-failure");
2265 if (audit_buf == NULL)
2266 return;
2267 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2268 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2269 u32 spi = ntohl(net_spi);
2270 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2271 spi, spi, ntohl(net_seq));
2272 }
2273 audit_log_end(audit_buf);
2274 }
2275 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2276 #endif /* CONFIG_AUDITSYSCALL */
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