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Merge tag 'rdma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[mirror_ubuntu-artful-kernel.git] / net / xfrm / xfrm_state.c
1 /*
2 * xfrm_state.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * YOSHIFUJI Hideaki @USAGI
10 * Split up af-specific functions
11 * Derek Atkins <derek@ihtfp.com>
12 * Add UDP Encapsulation
13 *
14 */
15
16 #include <linux/workqueue.h>
17 #include <net/xfrm.h>
18 #include <linux/pfkeyv2.h>
19 #include <linux/ipsec.h>
20 #include <linux/module.h>
21 #include <linux/cache.h>
22 #include <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 inline unsigned int xfrm_dst_hash(struct net *net,
43 const xfrm_address_t *daddr,
44 const xfrm_address_t *saddr,
45 u32 reqid,
46 unsigned short family)
47 {
48 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
49 }
50
51 static inline unsigned int xfrm_src_hash(struct net *net,
52 const xfrm_address_t *daddr,
53 const xfrm_address_t *saddr,
54 unsigned short family)
55 {
56 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
57 }
58
59 static inline unsigned int
60 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
61 __be32 spi, u8 proto, unsigned short family)
62 {
63 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
64 }
65
66 static void xfrm_hash_transfer(struct hlist_head *list,
67 struct hlist_head *ndsttable,
68 struct hlist_head *nsrctable,
69 struct hlist_head *nspitable,
70 unsigned int nhashmask)
71 {
72 struct hlist_node *tmp;
73 struct xfrm_state *x;
74
75 hlist_for_each_entry_safe(x, tmp, list, bydst) {
76 unsigned int h;
77
78 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
79 x->props.reqid, x->props.family,
80 nhashmask);
81 hlist_add_head(&x->bydst, ndsttable+h);
82
83 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
84 x->props.family,
85 nhashmask);
86 hlist_add_head(&x->bysrc, nsrctable+h);
87
88 if (x->id.spi) {
89 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
90 x->id.proto, x->props.family,
91 nhashmask);
92 hlist_add_head(&x->byspi, nspitable+h);
93 }
94 }
95 }
96
97 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
98 {
99 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
100 }
101
102 static DEFINE_MUTEX(hash_resize_mutex);
103
104 static void xfrm_hash_resize(struct work_struct *work)
105 {
106 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
107 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
108 unsigned long nsize, osize;
109 unsigned int nhashmask, ohashmask;
110 int i;
111
112 mutex_lock(&hash_resize_mutex);
113
114 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
115 ndst = xfrm_hash_alloc(nsize);
116 if (!ndst)
117 goto out_unlock;
118 nsrc = xfrm_hash_alloc(nsize);
119 if (!nsrc) {
120 xfrm_hash_free(ndst, nsize);
121 goto out_unlock;
122 }
123 nspi = xfrm_hash_alloc(nsize);
124 if (!nspi) {
125 xfrm_hash_free(ndst, nsize);
126 xfrm_hash_free(nsrc, nsize);
127 goto out_unlock;
128 }
129
130 spin_lock_bh(&xfrm_state_lock);
131
132 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
133 for (i = net->xfrm.state_hmask; i >= 0; i--)
134 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
135 nhashmask);
136
137 odst = net->xfrm.state_bydst;
138 osrc = net->xfrm.state_bysrc;
139 ospi = net->xfrm.state_byspi;
140 ohashmask = net->xfrm.state_hmask;
141
142 net->xfrm.state_bydst = ndst;
143 net->xfrm.state_bysrc = nsrc;
144 net->xfrm.state_byspi = nspi;
145 net->xfrm.state_hmask = nhashmask;
146
147 spin_unlock_bh(&xfrm_state_lock);
148
149 osize = (ohashmask + 1) * sizeof(struct hlist_head);
150 xfrm_hash_free(odst, osize);
151 xfrm_hash_free(osrc, osize);
152 xfrm_hash_free(ospi, osize);
153
154 out_unlock:
155 mutex_unlock(&hash_resize_mutex);
156 }
157
158 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
159 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
160
161 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
162
163 int __xfrm_state_delete(struct xfrm_state *x);
164
165 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
166 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
167
168 static DEFINE_SPINLOCK(xfrm_type_lock);
169 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
170 {
171 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
172 const struct xfrm_type **typemap;
173 int err = 0;
174
175 if (unlikely(afinfo == NULL))
176 return -EAFNOSUPPORT;
177 typemap = afinfo->type_map;
178 spin_lock_bh(&xfrm_type_lock);
179
180 if (likely(typemap[type->proto] == NULL))
181 typemap[type->proto] = type;
182 else
183 err = -EEXIST;
184 spin_unlock_bh(&xfrm_type_lock);
185 xfrm_state_put_afinfo(afinfo);
186 return err;
187 }
188 EXPORT_SYMBOL(xfrm_register_type);
189
190 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
191 {
192 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
193 const struct xfrm_type **typemap;
194 int err = 0;
195
196 if (unlikely(afinfo == NULL))
197 return -EAFNOSUPPORT;
198 typemap = afinfo->type_map;
199 spin_lock_bh(&xfrm_type_lock);
200
201 if (unlikely(typemap[type->proto] != type))
202 err = -ENOENT;
203 else
204 typemap[type->proto] = NULL;
205 spin_unlock_bh(&xfrm_type_lock);
206 xfrm_state_put_afinfo(afinfo);
207 return err;
208 }
209 EXPORT_SYMBOL(xfrm_unregister_type);
210
211 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
212 {
213 struct xfrm_state_afinfo *afinfo;
214 const struct xfrm_type **typemap;
215 const struct xfrm_type *type;
216 int modload_attempted = 0;
217
218 retry:
219 afinfo = xfrm_state_get_afinfo(family);
220 if (unlikely(afinfo == NULL))
221 return NULL;
222 typemap = afinfo->type_map;
223
224 type = typemap[proto];
225 if (unlikely(type && !try_module_get(type->owner)))
226 type = NULL;
227 if (!type && !modload_attempted) {
228 xfrm_state_put_afinfo(afinfo);
229 request_module("xfrm-type-%d-%d", family, proto);
230 modload_attempted = 1;
231 goto retry;
232 }
233
234 xfrm_state_put_afinfo(afinfo);
235 return type;
236 }
237
238 static void xfrm_put_type(const struct xfrm_type *type)
239 {
240 module_put(type->owner);
241 }
242
243 static DEFINE_SPINLOCK(xfrm_mode_lock);
244 int xfrm_register_mode(struct xfrm_mode *mode, int family)
245 {
246 struct xfrm_state_afinfo *afinfo;
247 struct xfrm_mode **modemap;
248 int err;
249
250 if (unlikely(mode->encap >= XFRM_MODE_MAX))
251 return -EINVAL;
252
253 afinfo = xfrm_state_get_afinfo(family);
254 if (unlikely(afinfo == NULL))
255 return -EAFNOSUPPORT;
256
257 err = -EEXIST;
258 modemap = afinfo->mode_map;
259 spin_lock_bh(&xfrm_mode_lock);
260 if (modemap[mode->encap])
261 goto out;
262
263 err = -ENOENT;
264 if (!try_module_get(afinfo->owner))
265 goto out;
266
267 mode->afinfo = afinfo;
268 modemap[mode->encap] = mode;
269 err = 0;
270
271 out:
272 spin_unlock_bh(&xfrm_mode_lock);
273 xfrm_state_put_afinfo(afinfo);
274 return err;
275 }
276 EXPORT_SYMBOL(xfrm_register_mode);
277
278 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
279 {
280 struct xfrm_state_afinfo *afinfo;
281 struct xfrm_mode **modemap;
282 int err;
283
284 if (unlikely(mode->encap >= XFRM_MODE_MAX))
285 return -EINVAL;
286
287 afinfo = xfrm_state_get_afinfo(family);
288 if (unlikely(afinfo == NULL))
289 return -EAFNOSUPPORT;
290
291 err = -ENOENT;
292 modemap = afinfo->mode_map;
293 spin_lock_bh(&xfrm_mode_lock);
294 if (likely(modemap[mode->encap] == mode)) {
295 modemap[mode->encap] = NULL;
296 module_put(mode->afinfo->owner);
297 err = 0;
298 }
299
300 spin_unlock_bh(&xfrm_mode_lock);
301 xfrm_state_put_afinfo(afinfo);
302 return err;
303 }
304 EXPORT_SYMBOL(xfrm_unregister_mode);
305
306 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
307 {
308 struct xfrm_state_afinfo *afinfo;
309 struct xfrm_mode *mode;
310 int modload_attempted = 0;
311
312 if (unlikely(encap >= XFRM_MODE_MAX))
313 return NULL;
314
315 retry:
316 afinfo = xfrm_state_get_afinfo(family);
317 if (unlikely(afinfo == NULL))
318 return NULL;
319
320 mode = afinfo->mode_map[encap];
321 if (unlikely(mode && !try_module_get(mode->owner)))
322 mode = NULL;
323 if (!mode && !modload_attempted) {
324 xfrm_state_put_afinfo(afinfo);
325 request_module("xfrm-mode-%d-%d", family, encap);
326 modload_attempted = 1;
327 goto retry;
328 }
329
330 xfrm_state_put_afinfo(afinfo);
331 return mode;
332 }
333
334 static void xfrm_put_mode(struct xfrm_mode *mode)
335 {
336 module_put(mode->owner);
337 }
338
339 static void xfrm_state_gc_destroy(struct xfrm_state *x)
340 {
341 tasklet_hrtimer_cancel(&x->mtimer);
342 del_timer_sync(&x->rtimer);
343 kfree(x->aalg);
344 kfree(x->ealg);
345 kfree(x->calg);
346 kfree(x->encap);
347 kfree(x->coaddr);
348 kfree(x->replay_esn);
349 kfree(x->preplay_esn);
350 if (x->inner_mode)
351 xfrm_put_mode(x->inner_mode);
352 if (x->inner_mode_iaf)
353 xfrm_put_mode(x->inner_mode_iaf);
354 if (x->outer_mode)
355 xfrm_put_mode(x->outer_mode);
356 if (x->type) {
357 x->type->destructor(x);
358 xfrm_put_type(x->type);
359 }
360 security_xfrm_state_free(x);
361 kfree(x);
362 }
363
364 static void xfrm_state_gc_task(struct work_struct *work)
365 {
366 struct net *net = container_of(work, struct net, xfrm.state_gc_work);
367 struct xfrm_state *x;
368 struct hlist_node *tmp;
369 struct hlist_head gc_list;
370
371 spin_lock_bh(&xfrm_state_gc_lock);
372 hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
373 spin_unlock_bh(&xfrm_state_gc_lock);
374
375 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
376 xfrm_state_gc_destroy(x);
377
378 wake_up(&net->xfrm.km_waitq);
379 }
380
381 static inline unsigned long make_jiffies(long secs)
382 {
383 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
384 return MAX_SCHEDULE_TIMEOUT-1;
385 else
386 return secs*HZ;
387 }
388
389 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
390 {
391 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
392 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
393 struct net *net = xs_net(x);
394 unsigned long now = get_seconds();
395 long next = LONG_MAX;
396 int warn = 0;
397 int err = 0;
398
399 spin_lock(&x->lock);
400 if (x->km.state == XFRM_STATE_DEAD)
401 goto out;
402 if (x->km.state == XFRM_STATE_EXPIRED)
403 goto expired;
404 if (x->lft.hard_add_expires_seconds) {
405 long tmo = x->lft.hard_add_expires_seconds +
406 x->curlft.add_time - now;
407 if (tmo <= 0) {
408 if (x->xflags & XFRM_SOFT_EXPIRE) {
409 /* enter hard expire without soft expire first?!
410 * setting a new date could trigger this.
411 * workarbound: fix x->curflt.add_time by below:
412 */
413 x->curlft.add_time = now - x->saved_tmo - 1;
414 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
415 } else
416 goto expired;
417 }
418 if (tmo < next)
419 next = tmo;
420 }
421 if (x->lft.hard_use_expires_seconds) {
422 long tmo = x->lft.hard_use_expires_seconds +
423 (x->curlft.use_time ? : now) - now;
424 if (tmo <= 0)
425 goto expired;
426 if (tmo < next)
427 next = tmo;
428 }
429 if (x->km.dying)
430 goto resched;
431 if (x->lft.soft_add_expires_seconds) {
432 long tmo = x->lft.soft_add_expires_seconds +
433 x->curlft.add_time - now;
434 if (tmo <= 0) {
435 warn = 1;
436 x->xflags &= ~XFRM_SOFT_EXPIRE;
437 } else if (tmo < next) {
438 next = tmo;
439 x->xflags |= XFRM_SOFT_EXPIRE;
440 x->saved_tmo = tmo;
441 }
442 }
443 if (x->lft.soft_use_expires_seconds) {
444 long tmo = x->lft.soft_use_expires_seconds +
445 (x->curlft.use_time ? : now) - now;
446 if (tmo <= 0)
447 warn = 1;
448 else if (tmo < next)
449 next = tmo;
450 }
451
452 x->km.dying = warn;
453 if (warn)
454 km_state_expired(x, 0, 0);
455 resched:
456 if (next != LONG_MAX){
457 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
458 }
459
460 goto out;
461
462 expired:
463 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
464 x->km.state = XFRM_STATE_EXPIRED;
465 wake_up(&net->xfrm.km_waitq);
466 next = 2;
467 goto resched;
468 }
469
470 err = __xfrm_state_delete(x);
471 if (!err && x->id.spi)
472 km_state_expired(x, 1, 0);
473
474 xfrm_audit_state_delete(x, err ? 0 : 1,
475 audit_get_loginuid(current),
476 audit_get_sessionid(current), 0);
477
478 out:
479 spin_unlock(&x->lock);
480 return HRTIMER_NORESTART;
481 }
482
483 static void xfrm_replay_timer_handler(unsigned long data);
484
485 struct xfrm_state *xfrm_state_alloc(struct net *net)
486 {
487 struct xfrm_state *x;
488
489 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
490
491 if (x) {
492 write_pnet(&x->xs_net, net);
493 atomic_set(&x->refcnt, 1);
494 atomic_set(&x->tunnel_users, 0);
495 INIT_LIST_HEAD(&x->km.all);
496 INIT_HLIST_NODE(&x->bydst);
497 INIT_HLIST_NODE(&x->bysrc);
498 INIT_HLIST_NODE(&x->byspi);
499 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS);
500 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
501 (unsigned long)x);
502 x->curlft.add_time = get_seconds();
503 x->lft.soft_byte_limit = XFRM_INF;
504 x->lft.soft_packet_limit = XFRM_INF;
505 x->lft.hard_byte_limit = XFRM_INF;
506 x->lft.hard_packet_limit = XFRM_INF;
507 x->replay_maxage = 0;
508 x->replay_maxdiff = 0;
509 x->inner_mode = NULL;
510 x->inner_mode_iaf = NULL;
511 spin_lock_init(&x->lock);
512 }
513 return x;
514 }
515 EXPORT_SYMBOL(xfrm_state_alloc);
516
517 void __xfrm_state_destroy(struct xfrm_state *x)
518 {
519 struct net *net = xs_net(x);
520
521 WARN_ON(x->km.state != XFRM_STATE_DEAD);
522
523 spin_lock_bh(&xfrm_state_gc_lock);
524 hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
525 spin_unlock_bh(&xfrm_state_gc_lock);
526 schedule_work(&net->xfrm.state_gc_work);
527 }
528 EXPORT_SYMBOL(__xfrm_state_destroy);
529
530 int __xfrm_state_delete(struct xfrm_state *x)
531 {
532 struct net *net = xs_net(x);
533 int err = -ESRCH;
534
535 if (x->km.state != XFRM_STATE_DEAD) {
536 x->km.state = XFRM_STATE_DEAD;
537 spin_lock(&xfrm_state_lock);
538 list_del(&x->km.all);
539 hlist_del(&x->bydst);
540 hlist_del(&x->bysrc);
541 if (x->id.spi)
542 hlist_del(&x->byspi);
543 net->xfrm.state_num--;
544 spin_unlock(&xfrm_state_lock);
545
546 /* All xfrm_state objects are created by xfrm_state_alloc.
547 * The xfrm_state_alloc call gives a reference, and that
548 * is what we are dropping here.
549 */
550 xfrm_state_put(x);
551 err = 0;
552 }
553
554 return err;
555 }
556 EXPORT_SYMBOL(__xfrm_state_delete);
557
558 int xfrm_state_delete(struct xfrm_state *x)
559 {
560 int err;
561
562 spin_lock_bh(&x->lock);
563 err = __xfrm_state_delete(x);
564 spin_unlock_bh(&x->lock);
565
566 return err;
567 }
568 EXPORT_SYMBOL(xfrm_state_delete);
569
570 #ifdef CONFIG_SECURITY_NETWORK_XFRM
571 static inline int
572 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
573 {
574 int i, err = 0;
575
576 for (i = 0; i <= net->xfrm.state_hmask; i++) {
577 struct xfrm_state *x;
578
579 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
580 if (xfrm_id_proto_match(x->id.proto, proto) &&
581 (err = security_xfrm_state_delete(x)) != 0) {
582 xfrm_audit_state_delete(x, 0,
583 audit_info->loginuid,
584 audit_info->sessionid,
585 audit_info->secid);
586 return err;
587 }
588 }
589 }
590
591 return err;
592 }
593 #else
594 static inline int
595 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
596 {
597 return 0;
598 }
599 #endif
600
601 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
602 {
603 int i, err = 0, cnt = 0;
604
605 spin_lock_bh(&xfrm_state_lock);
606 err = xfrm_state_flush_secctx_check(net, proto, audit_info);
607 if (err)
608 goto out;
609
610 err = -ESRCH;
611 for (i = 0; i <= net->xfrm.state_hmask; i++) {
612 struct xfrm_state *x;
613 restart:
614 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
615 if (!xfrm_state_kern(x) &&
616 xfrm_id_proto_match(x->id.proto, proto)) {
617 xfrm_state_hold(x);
618 spin_unlock_bh(&xfrm_state_lock);
619
620 err = xfrm_state_delete(x);
621 xfrm_audit_state_delete(x, err ? 0 : 1,
622 audit_info->loginuid,
623 audit_info->sessionid,
624 audit_info->secid);
625 xfrm_state_put(x);
626 if (!err)
627 cnt++;
628
629 spin_lock_bh(&xfrm_state_lock);
630 goto restart;
631 }
632 }
633 }
634 if (cnt)
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_tempstate(struct xfrm_state *x, const struct flowi *fl,
656 const struct xfrm_tmpl *tmpl,
657 const xfrm_address_t *daddr, const 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->sel, fl);
664
665 if (family != tmpl->encap_family) {
666 xfrm_state_put_afinfo(afinfo);
667 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
668 if (!afinfo)
669 return -1;
670 }
671 afinfo->init_temprop(x, tmpl, daddr, saddr);
672 xfrm_state_put_afinfo(afinfo);
673 return 0;
674 }
675
676 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
677 const xfrm_address_t *daddr,
678 __be32 spi, u8 proto,
679 unsigned short family)
680 {
681 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
682 struct xfrm_state *x;
683
684 hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) {
685 if (x->props.family != family ||
686 x->id.spi != spi ||
687 x->id.proto != proto ||
688 !xfrm_addr_equal(&x->id.daddr, daddr, family))
689 continue;
690
691 if ((mark & x->mark.m) != x->mark.v)
692 continue;
693 xfrm_state_hold(x);
694 return x;
695 }
696
697 return NULL;
698 }
699
700 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
701 const xfrm_address_t *daddr,
702 const xfrm_address_t *saddr,
703 u8 proto, unsigned short family)
704 {
705 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
706 struct xfrm_state *x;
707
708 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
709 if (x->props.family != family ||
710 x->id.proto != proto ||
711 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
712 !xfrm_addr_equal(&x->props.saddr, saddr, family))
713 continue;
714
715 if ((mark & x->mark.m) != x->mark.v)
716 continue;
717 xfrm_state_hold(x);
718 return x;
719 }
720
721 return NULL;
722 }
723
724 static inline struct xfrm_state *
725 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
726 {
727 struct net *net = xs_net(x);
728 u32 mark = x->mark.v & x->mark.m;
729
730 if (use_spi)
731 return __xfrm_state_lookup(net, mark, &x->id.daddr,
732 x->id.spi, x->id.proto, family);
733 else
734 return __xfrm_state_lookup_byaddr(net, mark,
735 &x->id.daddr,
736 &x->props.saddr,
737 x->id.proto, family);
738 }
739
740 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
741 {
742 if (have_hash_collision &&
743 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
744 net->xfrm.state_num > net->xfrm.state_hmask)
745 schedule_work(&net->xfrm.state_hash_work);
746 }
747
748 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
749 const struct flowi *fl, unsigned short family,
750 struct xfrm_state **best, int *acq_in_progress,
751 int *error)
752 {
753 /* Resolution logic:
754 * 1. There is a valid state with matching selector. Done.
755 * 2. Valid state with inappropriate selector. Skip.
756 *
757 * Entering area of "sysdeps".
758 *
759 * 3. If state is not valid, selector is temporary, it selects
760 * only session which triggered previous resolution. Key
761 * manager will do something to install a state with proper
762 * selector.
763 */
764 if (x->km.state == XFRM_STATE_VALID) {
765 if ((x->sel.family &&
766 !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
767 !security_xfrm_state_pol_flow_match(x, pol, fl))
768 return;
769
770 if (!*best ||
771 (*best)->km.dying > x->km.dying ||
772 ((*best)->km.dying == x->km.dying &&
773 (*best)->curlft.add_time < x->curlft.add_time))
774 *best = x;
775 } else if (x->km.state == XFRM_STATE_ACQ) {
776 *acq_in_progress = 1;
777 } else if (x->km.state == XFRM_STATE_ERROR ||
778 x->km.state == XFRM_STATE_EXPIRED) {
779 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
780 security_xfrm_state_pol_flow_match(x, pol, fl))
781 *error = -ESRCH;
782 }
783 }
784
785 struct xfrm_state *
786 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
787 const struct flowi *fl, struct xfrm_tmpl *tmpl,
788 struct xfrm_policy *pol, int *err,
789 unsigned short family)
790 {
791 static xfrm_address_t saddr_wildcard = { };
792 struct net *net = xp_net(pol);
793 unsigned int h, h_wildcard;
794 struct xfrm_state *x, *x0, *to_put;
795 int acquire_in_progress = 0;
796 int error = 0;
797 struct xfrm_state *best = NULL;
798 u32 mark = pol->mark.v & pol->mark.m;
799 unsigned short encap_family = tmpl->encap_family;
800
801 to_put = NULL;
802
803 spin_lock_bh(&xfrm_state_lock);
804 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
805 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
806 if (x->props.family == encap_family &&
807 x->props.reqid == tmpl->reqid &&
808 (mark & x->mark.m) == x->mark.v &&
809 !(x->props.flags & XFRM_STATE_WILDRECV) &&
810 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
811 tmpl->mode == x->props.mode &&
812 tmpl->id.proto == x->id.proto &&
813 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
814 xfrm_state_look_at(pol, x, fl, encap_family,
815 &best, &acquire_in_progress, &error);
816 }
817 if (best)
818 goto found;
819
820 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
821 hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) {
822 if (x->props.family == encap_family &&
823 x->props.reqid == tmpl->reqid &&
824 (mark & x->mark.m) == x->mark.v &&
825 !(x->props.flags & XFRM_STATE_WILDRECV) &&
826 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
827 tmpl->mode == x->props.mode &&
828 tmpl->id.proto == x->id.proto &&
829 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
830 xfrm_state_look_at(pol, x, fl, encap_family,
831 &best, &acquire_in_progress, &error);
832 }
833
834 found:
835 x = best;
836 if (!x && !error && !acquire_in_progress) {
837 if (tmpl->id.spi &&
838 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
839 tmpl->id.proto, encap_family)) != NULL) {
840 to_put = x0;
841 error = -EEXIST;
842 goto out;
843 }
844 x = xfrm_state_alloc(net);
845 if (x == NULL) {
846 error = -ENOMEM;
847 goto out;
848 }
849 /* Initialize temporary state matching only
850 * to current session. */
851 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
852 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
853
854 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
855 if (error) {
856 x->km.state = XFRM_STATE_DEAD;
857 to_put = x;
858 x = NULL;
859 goto out;
860 }
861
862 if (km_query(x, tmpl, pol) == 0) {
863 x->km.state = XFRM_STATE_ACQ;
864 list_add(&x->km.all, &net->xfrm.state_all);
865 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
866 h = xfrm_src_hash(net, daddr, saddr, encap_family);
867 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
868 if (x->id.spi) {
869 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
870 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
871 }
872 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
873 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
874 net->xfrm.state_num++;
875 xfrm_hash_grow_check(net, x->bydst.next != NULL);
876 } else {
877 x->km.state = XFRM_STATE_DEAD;
878 to_put = x;
879 x = NULL;
880 error = -ESRCH;
881 }
882 }
883 out:
884 if (x)
885 xfrm_state_hold(x);
886 else
887 *err = acquire_in_progress ? -EAGAIN : error;
888 spin_unlock_bh(&xfrm_state_lock);
889 if (to_put)
890 xfrm_state_put(to_put);
891 return x;
892 }
893
894 struct xfrm_state *
895 xfrm_stateonly_find(struct net *net, u32 mark,
896 xfrm_address_t *daddr, xfrm_address_t *saddr,
897 unsigned short family, u8 mode, u8 proto, u32 reqid)
898 {
899 unsigned int h;
900 struct xfrm_state *rx = NULL, *x = NULL;
901
902 spin_lock(&xfrm_state_lock);
903 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
904 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
905 if (x->props.family == family &&
906 x->props.reqid == reqid &&
907 (mark & x->mark.m) == x->mark.v &&
908 !(x->props.flags & XFRM_STATE_WILDRECV) &&
909 xfrm_state_addr_check(x, daddr, saddr, family) &&
910 mode == x->props.mode &&
911 proto == x->id.proto &&
912 x->km.state == XFRM_STATE_VALID) {
913 rx = x;
914 break;
915 }
916 }
917
918 if (rx)
919 xfrm_state_hold(rx);
920 spin_unlock(&xfrm_state_lock);
921
922
923 return rx;
924 }
925 EXPORT_SYMBOL(xfrm_stateonly_find);
926
927 static void __xfrm_state_insert(struct xfrm_state *x)
928 {
929 struct net *net = xs_net(x);
930 unsigned int h;
931
932 list_add(&x->km.all, &net->xfrm.state_all);
933
934 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
935 x->props.reqid, x->props.family);
936 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
937
938 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
939 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
940
941 if (x->id.spi) {
942 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
943 x->props.family);
944
945 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
946 }
947
948 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
949 if (x->replay_maxage)
950 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
951
952 wake_up(&net->xfrm.km_waitq);
953
954 net->xfrm.state_num++;
955
956 xfrm_hash_grow_check(net, x->bydst.next != NULL);
957 }
958
959 /* xfrm_state_lock is held */
960 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
961 {
962 struct net *net = xs_net(xnew);
963 unsigned short family = xnew->props.family;
964 u32 reqid = xnew->props.reqid;
965 struct xfrm_state *x;
966 unsigned int h;
967 u32 mark = xnew->mark.v & xnew->mark.m;
968
969 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
970 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
971 if (x->props.family == family &&
972 x->props.reqid == reqid &&
973 (mark & x->mark.m) == x->mark.v &&
974 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
975 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
976 x->genid++;
977 }
978 }
979
980 void xfrm_state_insert(struct xfrm_state *x)
981 {
982 spin_lock_bh(&xfrm_state_lock);
983 __xfrm_state_bump_genids(x);
984 __xfrm_state_insert(x);
985 spin_unlock_bh(&xfrm_state_lock);
986 }
987 EXPORT_SYMBOL(xfrm_state_insert);
988
989 /* xfrm_state_lock is held */
990 static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m,
991 unsigned short family, u8 mode,
992 u32 reqid, u8 proto,
993 const xfrm_address_t *daddr,
994 const xfrm_address_t *saddr, int create)
995 {
996 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
997 struct xfrm_state *x;
998 u32 mark = m->v & m->m;
999
1000 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1001 if (x->props.reqid != reqid ||
1002 x->props.mode != mode ||
1003 x->props.family != family ||
1004 x->km.state != XFRM_STATE_ACQ ||
1005 x->id.spi != 0 ||
1006 x->id.proto != proto ||
1007 (mark & x->mark.m) != x->mark.v ||
1008 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1009 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1010 continue;
1011
1012 xfrm_state_hold(x);
1013 return x;
1014 }
1015
1016 if (!create)
1017 return NULL;
1018
1019 x = xfrm_state_alloc(net);
1020 if (likely(x)) {
1021 switch (family) {
1022 case AF_INET:
1023 x->sel.daddr.a4 = daddr->a4;
1024 x->sel.saddr.a4 = saddr->a4;
1025 x->sel.prefixlen_d = 32;
1026 x->sel.prefixlen_s = 32;
1027 x->props.saddr.a4 = saddr->a4;
1028 x->id.daddr.a4 = daddr->a4;
1029 break;
1030
1031 case AF_INET6:
1032 *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr;
1033 *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr;
1034 x->sel.prefixlen_d = 128;
1035 x->sel.prefixlen_s = 128;
1036 *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr;
1037 *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr;
1038 break;
1039 }
1040
1041 x->km.state = XFRM_STATE_ACQ;
1042 x->id.proto = proto;
1043 x->props.family = family;
1044 x->props.mode = mode;
1045 x->props.reqid = reqid;
1046 x->mark.v = m->v;
1047 x->mark.m = m->m;
1048 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1049 xfrm_state_hold(x);
1050 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1051 list_add(&x->km.all, &net->xfrm.state_all);
1052 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1053 h = xfrm_src_hash(net, daddr, saddr, family);
1054 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1055
1056 net->xfrm.state_num++;
1057
1058 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1059 }
1060
1061 return x;
1062 }
1063
1064 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1065
1066 int xfrm_state_add(struct xfrm_state *x)
1067 {
1068 struct net *net = xs_net(x);
1069 struct xfrm_state *x1, *to_put;
1070 int family;
1071 int err;
1072 u32 mark = x->mark.v & x->mark.m;
1073 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1074
1075 family = x->props.family;
1076
1077 to_put = NULL;
1078
1079 spin_lock_bh(&xfrm_state_lock);
1080
1081 x1 = __xfrm_state_locate(x, use_spi, family);
1082 if (x1) {
1083 to_put = x1;
1084 x1 = NULL;
1085 err = -EEXIST;
1086 goto out;
1087 }
1088
1089 if (use_spi && x->km.seq) {
1090 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1091 if (x1 && ((x1->id.proto != x->id.proto) ||
1092 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1093 to_put = x1;
1094 x1 = NULL;
1095 }
1096 }
1097
1098 if (use_spi && !x1)
1099 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1100 x->props.reqid, x->id.proto,
1101 &x->id.daddr, &x->props.saddr, 0);
1102
1103 __xfrm_state_bump_genids(x);
1104 __xfrm_state_insert(x);
1105 err = 0;
1106
1107 out:
1108 spin_unlock_bh(&xfrm_state_lock);
1109
1110 if (x1) {
1111 xfrm_state_delete(x1);
1112 xfrm_state_put(x1);
1113 }
1114
1115 if (to_put)
1116 xfrm_state_put(to_put);
1117
1118 return err;
1119 }
1120 EXPORT_SYMBOL(xfrm_state_add);
1121
1122 #ifdef CONFIG_XFRM_MIGRATE
1123 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1124 {
1125 struct net *net = xs_net(orig);
1126 int err = -ENOMEM;
1127 struct xfrm_state *x = xfrm_state_alloc(net);
1128 if (!x)
1129 goto out;
1130
1131 memcpy(&x->id, &orig->id, sizeof(x->id));
1132 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1133 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1134 x->props.mode = orig->props.mode;
1135 x->props.replay_window = orig->props.replay_window;
1136 x->props.reqid = orig->props.reqid;
1137 x->props.family = orig->props.family;
1138 x->props.saddr = orig->props.saddr;
1139
1140 if (orig->aalg) {
1141 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1142 if (!x->aalg)
1143 goto error;
1144 }
1145 x->props.aalgo = orig->props.aalgo;
1146
1147 if (orig->ealg) {
1148 x->ealg = xfrm_algo_clone(orig->ealg);
1149 if (!x->ealg)
1150 goto error;
1151 }
1152 x->props.ealgo = orig->props.ealgo;
1153
1154 if (orig->calg) {
1155 x->calg = xfrm_algo_clone(orig->calg);
1156 if (!x->calg)
1157 goto error;
1158 }
1159 x->props.calgo = orig->props.calgo;
1160
1161 if (orig->encap) {
1162 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1163 if (!x->encap)
1164 goto error;
1165 }
1166
1167 if (orig->coaddr) {
1168 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1169 GFP_KERNEL);
1170 if (!x->coaddr)
1171 goto error;
1172 }
1173
1174 if (orig->replay_esn) {
1175 err = xfrm_replay_clone(x, orig);
1176 if (err)
1177 goto error;
1178 }
1179
1180 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1181
1182 err = xfrm_init_state(x);
1183 if (err)
1184 goto error;
1185
1186 x->props.flags = orig->props.flags;
1187 x->props.extra_flags = orig->props.extra_flags;
1188
1189 x->curlft.add_time = orig->curlft.add_time;
1190 x->km.state = orig->km.state;
1191 x->km.seq = orig->km.seq;
1192
1193 return x;
1194
1195 error:
1196 xfrm_state_put(x);
1197 out:
1198 if (errp)
1199 *errp = err;
1200 return NULL;
1201 }
1202
1203 /* xfrm_state_lock is held */
1204 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1205 {
1206 unsigned int h;
1207 struct xfrm_state *x;
1208
1209 if (m->reqid) {
1210 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1211 m->reqid, m->old_family);
1212 hlist_for_each_entry(x, init_net.xfrm.state_bydst+h, bydst) {
1213 if (x->props.mode != m->mode ||
1214 x->id.proto != m->proto)
1215 continue;
1216 if (m->reqid && x->props.reqid != m->reqid)
1217 continue;
1218 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1219 m->old_family) ||
1220 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1221 m->old_family))
1222 continue;
1223 xfrm_state_hold(x);
1224 return x;
1225 }
1226 } else {
1227 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1228 m->old_family);
1229 hlist_for_each_entry(x, init_net.xfrm.state_bysrc+h, bysrc) {
1230 if (x->props.mode != m->mode ||
1231 x->id.proto != m->proto)
1232 continue;
1233 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1234 m->old_family) ||
1235 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1236 m->old_family))
1237 continue;
1238 xfrm_state_hold(x);
1239 return x;
1240 }
1241 }
1242
1243 return NULL;
1244 }
1245 EXPORT_SYMBOL(xfrm_migrate_state_find);
1246
1247 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1248 struct xfrm_migrate *m)
1249 {
1250 struct xfrm_state *xc;
1251 int err;
1252
1253 xc = xfrm_state_clone(x, &err);
1254 if (!xc)
1255 return NULL;
1256
1257 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1258 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1259
1260 /* add state */
1261 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1262 /* a care is needed when the destination address of the
1263 state is to be updated as it is a part of triplet */
1264 xfrm_state_insert(xc);
1265 } else {
1266 if ((err = xfrm_state_add(xc)) < 0)
1267 goto error;
1268 }
1269
1270 return xc;
1271 error:
1272 xfrm_state_put(xc);
1273 return NULL;
1274 }
1275 EXPORT_SYMBOL(xfrm_state_migrate);
1276 #endif
1277
1278 int xfrm_state_update(struct xfrm_state *x)
1279 {
1280 struct xfrm_state *x1, *to_put;
1281 int err;
1282 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1283
1284 to_put = NULL;
1285
1286 spin_lock_bh(&xfrm_state_lock);
1287 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1288
1289 err = -ESRCH;
1290 if (!x1)
1291 goto out;
1292
1293 if (xfrm_state_kern(x1)) {
1294 to_put = x1;
1295 err = -EEXIST;
1296 goto out;
1297 }
1298
1299 if (x1->km.state == XFRM_STATE_ACQ) {
1300 __xfrm_state_insert(x);
1301 x = NULL;
1302 }
1303 err = 0;
1304
1305 out:
1306 spin_unlock_bh(&xfrm_state_lock);
1307
1308 if (to_put)
1309 xfrm_state_put(to_put);
1310
1311 if (err)
1312 return err;
1313
1314 if (!x) {
1315 xfrm_state_delete(x1);
1316 xfrm_state_put(x1);
1317 return 0;
1318 }
1319
1320 err = -EINVAL;
1321 spin_lock_bh(&x1->lock);
1322 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1323 if (x->encap && x1->encap)
1324 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1325 if (x->coaddr && x1->coaddr) {
1326 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1327 }
1328 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1329 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1330 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1331 x1->km.dying = 0;
1332
1333 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1334 if (x1->curlft.use_time)
1335 xfrm_state_check_expire(x1);
1336
1337 err = 0;
1338 x->km.state = XFRM_STATE_DEAD;
1339 __xfrm_state_put(x);
1340 }
1341 spin_unlock_bh(&x1->lock);
1342
1343 xfrm_state_put(x1);
1344
1345 return err;
1346 }
1347 EXPORT_SYMBOL(xfrm_state_update);
1348
1349 int xfrm_state_check_expire(struct xfrm_state *x)
1350 {
1351 if (!x->curlft.use_time)
1352 x->curlft.use_time = get_seconds();
1353
1354 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1355 x->curlft.packets >= x->lft.hard_packet_limit) {
1356 x->km.state = XFRM_STATE_EXPIRED;
1357 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
1358 return -EINVAL;
1359 }
1360
1361 if (!x->km.dying &&
1362 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1363 x->curlft.packets >= x->lft.soft_packet_limit)) {
1364 x->km.dying = 1;
1365 km_state_expired(x, 0, 0);
1366 }
1367 return 0;
1368 }
1369 EXPORT_SYMBOL(xfrm_state_check_expire);
1370
1371 struct xfrm_state *
1372 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1373 u8 proto, unsigned short family)
1374 {
1375 struct xfrm_state *x;
1376
1377 spin_lock_bh(&xfrm_state_lock);
1378 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1379 spin_unlock_bh(&xfrm_state_lock);
1380 return x;
1381 }
1382 EXPORT_SYMBOL(xfrm_state_lookup);
1383
1384 struct xfrm_state *
1385 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1386 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1387 u8 proto, unsigned short family)
1388 {
1389 struct xfrm_state *x;
1390
1391 spin_lock_bh(&xfrm_state_lock);
1392 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1393 spin_unlock_bh(&xfrm_state_lock);
1394 return x;
1395 }
1396 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1397
1398 struct xfrm_state *
1399 xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto,
1400 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1401 int create, unsigned short family)
1402 {
1403 struct xfrm_state *x;
1404
1405 spin_lock_bh(&xfrm_state_lock);
1406 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1407 spin_unlock_bh(&xfrm_state_lock);
1408
1409 return x;
1410 }
1411 EXPORT_SYMBOL(xfrm_find_acq);
1412
1413 #ifdef CONFIG_XFRM_SUB_POLICY
1414 int
1415 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1416 unsigned short family)
1417 {
1418 int err = 0;
1419 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1420 if (!afinfo)
1421 return -EAFNOSUPPORT;
1422
1423 spin_lock_bh(&xfrm_state_lock);
1424 if (afinfo->tmpl_sort)
1425 err = afinfo->tmpl_sort(dst, src, n);
1426 spin_unlock_bh(&xfrm_state_lock);
1427 xfrm_state_put_afinfo(afinfo);
1428 return err;
1429 }
1430 EXPORT_SYMBOL(xfrm_tmpl_sort);
1431
1432 int
1433 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1434 unsigned short family)
1435 {
1436 int err = 0;
1437 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1438 if (!afinfo)
1439 return -EAFNOSUPPORT;
1440
1441 spin_lock_bh(&xfrm_state_lock);
1442 if (afinfo->state_sort)
1443 err = afinfo->state_sort(dst, src, n);
1444 spin_unlock_bh(&xfrm_state_lock);
1445 xfrm_state_put_afinfo(afinfo);
1446 return err;
1447 }
1448 EXPORT_SYMBOL(xfrm_state_sort);
1449 #endif
1450
1451 /* Silly enough, but I'm lazy to build resolution list */
1452
1453 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1454 {
1455 int i;
1456
1457 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1458 struct xfrm_state *x;
1459
1460 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1461 if (x->km.seq == seq &&
1462 (mark & x->mark.m) == x->mark.v &&
1463 x->km.state == XFRM_STATE_ACQ) {
1464 xfrm_state_hold(x);
1465 return x;
1466 }
1467 }
1468 }
1469 return NULL;
1470 }
1471
1472 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1473 {
1474 struct xfrm_state *x;
1475
1476 spin_lock_bh(&xfrm_state_lock);
1477 x = __xfrm_find_acq_byseq(net, mark, seq);
1478 spin_unlock_bh(&xfrm_state_lock);
1479 return x;
1480 }
1481 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1482
1483 u32 xfrm_get_acqseq(void)
1484 {
1485 u32 res;
1486 static atomic_t acqseq;
1487
1488 do {
1489 res = atomic_inc_return(&acqseq);
1490 } while (!res);
1491
1492 return res;
1493 }
1494 EXPORT_SYMBOL(xfrm_get_acqseq);
1495
1496 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1497 {
1498 struct net *net = xs_net(x);
1499 unsigned int h;
1500 struct xfrm_state *x0;
1501 int err = -ENOENT;
1502 __be32 minspi = htonl(low);
1503 __be32 maxspi = htonl(high);
1504 u32 mark = x->mark.v & x->mark.m;
1505
1506 spin_lock_bh(&x->lock);
1507 if (x->km.state == XFRM_STATE_DEAD)
1508 goto unlock;
1509
1510 err = 0;
1511 if (x->id.spi)
1512 goto unlock;
1513
1514 err = -ENOENT;
1515
1516 if (minspi == maxspi) {
1517 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1518 if (x0) {
1519 xfrm_state_put(x0);
1520 goto unlock;
1521 }
1522 x->id.spi = minspi;
1523 } else {
1524 u32 spi = 0;
1525 for (h=0; h<high-low+1; h++) {
1526 spi = low + net_random()%(high-low+1);
1527 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1528 if (x0 == NULL) {
1529 x->id.spi = htonl(spi);
1530 break;
1531 }
1532 xfrm_state_put(x0);
1533 }
1534 }
1535 if (x->id.spi) {
1536 spin_lock_bh(&xfrm_state_lock);
1537 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1538 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1539 spin_unlock_bh(&xfrm_state_lock);
1540
1541 err = 0;
1542 }
1543
1544 unlock:
1545 spin_unlock_bh(&x->lock);
1546
1547 return err;
1548 }
1549 EXPORT_SYMBOL(xfrm_alloc_spi);
1550
1551 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1552 int (*func)(struct xfrm_state *, int, void*),
1553 void *data)
1554 {
1555 struct xfrm_state *state;
1556 struct xfrm_state_walk *x;
1557 int err = 0;
1558
1559 if (walk->seq != 0 && list_empty(&walk->all))
1560 return 0;
1561
1562 spin_lock_bh(&xfrm_state_lock);
1563 if (list_empty(&walk->all))
1564 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1565 else
1566 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1567 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1568 if (x->state == XFRM_STATE_DEAD)
1569 continue;
1570 state = container_of(x, struct xfrm_state, km);
1571 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1572 continue;
1573 err = func(state, walk->seq, data);
1574 if (err) {
1575 list_move_tail(&walk->all, &x->all);
1576 goto out;
1577 }
1578 walk->seq++;
1579 }
1580 if (walk->seq == 0) {
1581 err = -ENOENT;
1582 goto out;
1583 }
1584 list_del_init(&walk->all);
1585 out:
1586 spin_unlock_bh(&xfrm_state_lock);
1587 return err;
1588 }
1589 EXPORT_SYMBOL(xfrm_state_walk);
1590
1591 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1592 {
1593 INIT_LIST_HEAD(&walk->all);
1594 walk->proto = proto;
1595 walk->state = XFRM_STATE_DEAD;
1596 walk->seq = 0;
1597 }
1598 EXPORT_SYMBOL(xfrm_state_walk_init);
1599
1600 void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1601 {
1602 if (list_empty(&walk->all))
1603 return;
1604
1605 spin_lock_bh(&xfrm_state_lock);
1606 list_del(&walk->all);
1607 spin_unlock_bh(&xfrm_state_lock);
1608 }
1609 EXPORT_SYMBOL(xfrm_state_walk_done);
1610
1611 static void xfrm_replay_timer_handler(unsigned long data)
1612 {
1613 struct xfrm_state *x = (struct xfrm_state*)data;
1614
1615 spin_lock(&x->lock);
1616
1617 if (x->km.state == XFRM_STATE_VALID) {
1618 if (xfrm_aevent_is_on(xs_net(x)))
1619 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1620 else
1621 x->xflags |= XFRM_TIME_DEFER;
1622 }
1623
1624 spin_unlock(&x->lock);
1625 }
1626
1627 static LIST_HEAD(xfrm_km_list);
1628
1629 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1630 {
1631 struct xfrm_mgr *km;
1632
1633 rcu_read_lock();
1634 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1635 if (km->notify_policy)
1636 km->notify_policy(xp, dir, c);
1637 rcu_read_unlock();
1638 }
1639
1640 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1641 {
1642 struct xfrm_mgr *km;
1643 rcu_read_lock();
1644 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1645 if (km->notify)
1646 km->notify(x, c);
1647 rcu_read_unlock();
1648 }
1649
1650 EXPORT_SYMBOL(km_policy_notify);
1651 EXPORT_SYMBOL(km_state_notify);
1652
1653 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1654 {
1655 struct net *net = xs_net(x);
1656 struct km_event c;
1657
1658 c.data.hard = hard;
1659 c.portid = portid;
1660 c.event = XFRM_MSG_EXPIRE;
1661 km_state_notify(x, &c);
1662
1663 if (hard)
1664 wake_up(&net->xfrm.km_waitq);
1665 }
1666
1667 EXPORT_SYMBOL(km_state_expired);
1668 /*
1669 * We send to all registered managers regardless of failure
1670 * We are happy with one success
1671 */
1672 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1673 {
1674 int err = -EINVAL, acqret;
1675 struct xfrm_mgr *km;
1676
1677 rcu_read_lock();
1678 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1679 acqret = km->acquire(x, t, pol);
1680 if (!acqret)
1681 err = acqret;
1682 }
1683 rcu_read_unlock();
1684 return err;
1685 }
1686 EXPORT_SYMBOL(km_query);
1687
1688 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1689 {
1690 int err = -EINVAL;
1691 struct xfrm_mgr *km;
1692
1693 rcu_read_lock();
1694 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1695 if (km->new_mapping)
1696 err = km->new_mapping(x, ipaddr, sport);
1697 if (!err)
1698 break;
1699 }
1700 rcu_read_unlock();
1701 return err;
1702 }
1703 EXPORT_SYMBOL(km_new_mapping);
1704
1705 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1706 {
1707 struct net *net = xp_net(pol);
1708 struct km_event c;
1709
1710 c.data.hard = hard;
1711 c.portid = portid;
1712 c.event = XFRM_MSG_POLEXPIRE;
1713 km_policy_notify(pol, dir, &c);
1714
1715 if (hard)
1716 wake_up(&net->xfrm.km_waitq);
1717 }
1718 EXPORT_SYMBOL(km_policy_expired);
1719
1720 #ifdef CONFIG_XFRM_MIGRATE
1721 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1722 const struct xfrm_migrate *m, int num_migrate,
1723 const struct xfrm_kmaddress *k)
1724 {
1725 int err = -EINVAL;
1726 int ret;
1727 struct xfrm_mgr *km;
1728
1729 rcu_read_lock();
1730 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1731 if (km->migrate) {
1732 ret = km->migrate(sel, dir, type, m, num_migrate, k);
1733 if (!ret)
1734 err = ret;
1735 }
1736 }
1737 rcu_read_unlock();
1738 return err;
1739 }
1740 EXPORT_SYMBOL(km_migrate);
1741 #endif
1742
1743 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1744 {
1745 int err = -EINVAL;
1746 int ret;
1747 struct xfrm_mgr *km;
1748
1749 rcu_read_lock();
1750 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1751 if (km->report) {
1752 ret = km->report(net, proto, sel, addr);
1753 if (!ret)
1754 err = ret;
1755 }
1756 }
1757 rcu_read_unlock();
1758 return err;
1759 }
1760 EXPORT_SYMBOL(km_report);
1761
1762 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1763 {
1764 int err;
1765 u8 *data;
1766 struct xfrm_mgr *km;
1767 struct xfrm_policy *pol = NULL;
1768
1769 if (optlen <= 0 || optlen > PAGE_SIZE)
1770 return -EMSGSIZE;
1771
1772 data = kmalloc(optlen, GFP_KERNEL);
1773 if (!data)
1774 return -ENOMEM;
1775
1776 err = -EFAULT;
1777 if (copy_from_user(data, optval, optlen))
1778 goto out;
1779
1780 err = -EINVAL;
1781 rcu_read_lock();
1782 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1783 pol = km->compile_policy(sk, optname, data,
1784 optlen, &err);
1785 if (err >= 0)
1786 break;
1787 }
1788 rcu_read_unlock();
1789
1790 if (err >= 0) {
1791 xfrm_sk_policy_insert(sk, err, pol);
1792 xfrm_pol_put(pol);
1793 err = 0;
1794 }
1795
1796 out:
1797 kfree(data);
1798 return err;
1799 }
1800 EXPORT_SYMBOL(xfrm_user_policy);
1801
1802 static DEFINE_SPINLOCK(xfrm_km_lock);
1803
1804 int xfrm_register_km(struct xfrm_mgr *km)
1805 {
1806 spin_lock_bh(&xfrm_km_lock);
1807 list_add_tail_rcu(&km->list, &xfrm_km_list);
1808 spin_unlock_bh(&xfrm_km_lock);
1809 return 0;
1810 }
1811 EXPORT_SYMBOL(xfrm_register_km);
1812
1813 int xfrm_unregister_km(struct xfrm_mgr *km)
1814 {
1815 spin_lock_bh(&xfrm_km_lock);
1816 list_del_rcu(&km->list);
1817 spin_unlock_bh(&xfrm_km_lock);
1818 synchronize_rcu();
1819 return 0;
1820 }
1821 EXPORT_SYMBOL(xfrm_unregister_km);
1822
1823 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1824 {
1825 int err = 0;
1826 if (unlikely(afinfo == NULL))
1827 return -EINVAL;
1828 if (unlikely(afinfo->family >= NPROTO))
1829 return -EAFNOSUPPORT;
1830 spin_lock_bh(&xfrm_state_afinfo_lock);
1831 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1832 err = -ENOBUFS;
1833 else
1834 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1835 spin_unlock_bh(&xfrm_state_afinfo_lock);
1836 return err;
1837 }
1838 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1839
1840 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1841 {
1842 int err = 0;
1843 if (unlikely(afinfo == NULL))
1844 return -EINVAL;
1845 if (unlikely(afinfo->family >= NPROTO))
1846 return -EAFNOSUPPORT;
1847 spin_lock_bh(&xfrm_state_afinfo_lock);
1848 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1849 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1850 err = -EINVAL;
1851 else
1852 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1853 }
1854 spin_unlock_bh(&xfrm_state_afinfo_lock);
1855 synchronize_rcu();
1856 return err;
1857 }
1858 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1859
1860 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1861 {
1862 struct xfrm_state_afinfo *afinfo;
1863 if (unlikely(family >= NPROTO))
1864 return NULL;
1865 rcu_read_lock();
1866 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1867 if (unlikely(!afinfo))
1868 rcu_read_unlock();
1869 return afinfo;
1870 }
1871
1872 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1873 {
1874 rcu_read_unlock();
1875 }
1876
1877 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1878 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1879 {
1880 if (x->tunnel) {
1881 struct xfrm_state *t = x->tunnel;
1882
1883 if (atomic_read(&t->tunnel_users) == 2)
1884 xfrm_state_delete(t);
1885 atomic_dec(&t->tunnel_users);
1886 xfrm_state_put(t);
1887 x->tunnel = NULL;
1888 }
1889 }
1890 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1891
1892 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1893 {
1894 int res;
1895
1896 spin_lock_bh(&x->lock);
1897 if (x->km.state == XFRM_STATE_VALID &&
1898 x->type && x->type->get_mtu)
1899 res = x->type->get_mtu(x, mtu);
1900 else
1901 res = mtu - x->props.header_len;
1902 spin_unlock_bh(&x->lock);
1903 return res;
1904 }
1905
1906 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
1907 {
1908 struct xfrm_state_afinfo *afinfo;
1909 struct xfrm_mode *inner_mode;
1910 int family = x->props.family;
1911 int err;
1912
1913 err = -EAFNOSUPPORT;
1914 afinfo = xfrm_state_get_afinfo(family);
1915 if (!afinfo)
1916 goto error;
1917
1918 err = 0;
1919 if (afinfo->init_flags)
1920 err = afinfo->init_flags(x);
1921
1922 xfrm_state_put_afinfo(afinfo);
1923
1924 if (err)
1925 goto error;
1926
1927 err = -EPROTONOSUPPORT;
1928
1929 if (x->sel.family != AF_UNSPEC) {
1930 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
1931 if (inner_mode == NULL)
1932 goto error;
1933
1934 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
1935 family != x->sel.family) {
1936 xfrm_put_mode(inner_mode);
1937 goto error;
1938 }
1939
1940 x->inner_mode = inner_mode;
1941 } else {
1942 struct xfrm_mode *inner_mode_iaf;
1943 int iafamily = AF_INET;
1944
1945 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
1946 if (inner_mode == NULL)
1947 goto error;
1948
1949 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
1950 xfrm_put_mode(inner_mode);
1951 goto error;
1952 }
1953 x->inner_mode = inner_mode;
1954
1955 if (x->props.family == AF_INET)
1956 iafamily = AF_INET6;
1957
1958 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
1959 if (inner_mode_iaf) {
1960 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
1961 x->inner_mode_iaf = inner_mode_iaf;
1962 else
1963 xfrm_put_mode(inner_mode_iaf);
1964 }
1965 }
1966
1967 x->type = xfrm_get_type(x->id.proto, family);
1968 if (x->type == NULL)
1969 goto error;
1970
1971 err = x->type->init_state(x);
1972 if (err)
1973 goto error;
1974
1975 x->outer_mode = xfrm_get_mode(x->props.mode, family);
1976 if (x->outer_mode == NULL) {
1977 err = -EPROTONOSUPPORT;
1978 goto error;
1979 }
1980
1981 if (init_replay) {
1982 err = xfrm_init_replay(x);
1983 if (err)
1984 goto error;
1985 }
1986
1987 x->km.state = XFRM_STATE_VALID;
1988
1989 error:
1990 return err;
1991 }
1992
1993 EXPORT_SYMBOL(__xfrm_init_state);
1994
1995 int xfrm_init_state(struct xfrm_state *x)
1996 {
1997 return __xfrm_init_state(x, true);
1998 }
1999
2000 EXPORT_SYMBOL(xfrm_init_state);
2001
2002 int __net_init xfrm_state_init(struct net *net)
2003 {
2004 unsigned int sz;
2005
2006 INIT_LIST_HEAD(&net->xfrm.state_all);
2007
2008 sz = sizeof(struct hlist_head) * 8;
2009
2010 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2011 if (!net->xfrm.state_bydst)
2012 goto out_bydst;
2013 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2014 if (!net->xfrm.state_bysrc)
2015 goto out_bysrc;
2016 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2017 if (!net->xfrm.state_byspi)
2018 goto out_byspi;
2019 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2020
2021 net->xfrm.state_num = 0;
2022 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2023 INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2024 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2025 init_waitqueue_head(&net->xfrm.km_waitq);
2026 return 0;
2027
2028 out_byspi:
2029 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2030 out_bysrc:
2031 xfrm_hash_free(net->xfrm.state_bydst, sz);
2032 out_bydst:
2033 return -ENOMEM;
2034 }
2035
2036 void xfrm_state_fini(struct net *net)
2037 {
2038 struct xfrm_audit audit_info;
2039 unsigned int sz;
2040
2041 flush_work(&net->xfrm.state_hash_work);
2042 audit_info.loginuid = INVALID_UID;
2043 audit_info.sessionid = -1;
2044 audit_info.secid = 0;
2045 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2046 flush_work(&net->xfrm.state_gc_work);
2047
2048 WARN_ON(!list_empty(&net->xfrm.state_all));
2049
2050 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2051 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2052 xfrm_hash_free(net->xfrm.state_byspi, sz);
2053 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2054 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2055 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2056 xfrm_hash_free(net->xfrm.state_bydst, sz);
2057 }
2058
2059 #ifdef CONFIG_AUDITSYSCALL
2060 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2061 struct audit_buffer *audit_buf)
2062 {
2063 struct xfrm_sec_ctx *ctx = x->security;
2064 u32 spi = ntohl(x->id.spi);
2065
2066 if (ctx)
2067 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2068 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2069
2070 switch(x->props.family) {
2071 case AF_INET:
2072 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2073 &x->props.saddr.a4, &x->id.daddr.a4);
2074 break;
2075 case AF_INET6:
2076 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2077 x->props.saddr.a6, x->id.daddr.a6);
2078 break;
2079 }
2080
2081 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2082 }
2083
2084 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2085 struct audit_buffer *audit_buf)
2086 {
2087 const struct iphdr *iph4;
2088 const struct ipv6hdr *iph6;
2089
2090 switch (family) {
2091 case AF_INET:
2092 iph4 = ip_hdr(skb);
2093 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2094 &iph4->saddr, &iph4->daddr);
2095 break;
2096 case AF_INET6:
2097 iph6 = ipv6_hdr(skb);
2098 audit_log_format(audit_buf,
2099 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2100 &iph6->saddr,&iph6->daddr,
2101 iph6->flow_lbl[0] & 0x0f,
2102 iph6->flow_lbl[1],
2103 iph6->flow_lbl[2]);
2104 break;
2105 }
2106 }
2107
2108 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2109 kuid_t auid, u32 sessionid, u32 secid)
2110 {
2111 struct audit_buffer *audit_buf;
2112
2113 audit_buf = xfrm_audit_start("SAD-add");
2114 if (audit_buf == NULL)
2115 return;
2116 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2117 xfrm_audit_helper_sainfo(x, audit_buf);
2118 audit_log_format(audit_buf, " res=%u", result);
2119 audit_log_end(audit_buf);
2120 }
2121 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2122
2123 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2124 kuid_t auid, u32 sessionid, u32 secid)
2125 {
2126 struct audit_buffer *audit_buf;
2127
2128 audit_buf = xfrm_audit_start("SAD-delete");
2129 if (audit_buf == NULL)
2130 return;
2131 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2132 xfrm_audit_helper_sainfo(x, audit_buf);
2133 audit_log_format(audit_buf, " res=%u", result);
2134 audit_log_end(audit_buf);
2135 }
2136 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2137
2138 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2139 struct sk_buff *skb)
2140 {
2141 struct audit_buffer *audit_buf;
2142 u32 spi;
2143
2144 audit_buf = xfrm_audit_start("SA-replay-overflow");
2145 if (audit_buf == NULL)
2146 return;
2147 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2148 /* don't record the sequence number because it's inherent in this kind
2149 * of audit message */
2150 spi = ntohl(x->id.spi);
2151 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2152 audit_log_end(audit_buf);
2153 }
2154 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2155
2156 void xfrm_audit_state_replay(struct xfrm_state *x,
2157 struct sk_buff *skb, __be32 net_seq)
2158 {
2159 struct audit_buffer *audit_buf;
2160 u32 spi;
2161
2162 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2163 if (audit_buf == NULL)
2164 return;
2165 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2166 spi = ntohl(x->id.spi);
2167 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2168 spi, spi, ntohl(net_seq));
2169 audit_log_end(audit_buf);
2170 }
2171 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2172
2173 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2174 {
2175 struct audit_buffer *audit_buf;
2176
2177 audit_buf = xfrm_audit_start("SA-notfound");
2178 if (audit_buf == NULL)
2179 return;
2180 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2181 audit_log_end(audit_buf);
2182 }
2183 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2184
2185 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2186 __be32 net_spi, __be32 net_seq)
2187 {
2188 struct audit_buffer *audit_buf;
2189 u32 spi;
2190
2191 audit_buf = xfrm_audit_start("SA-notfound");
2192 if (audit_buf == NULL)
2193 return;
2194 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2195 spi = ntohl(net_spi);
2196 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2197 spi, spi, ntohl(net_seq));
2198 audit_log_end(audit_buf);
2199 }
2200 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2201
2202 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2203 struct sk_buff *skb, u8 proto)
2204 {
2205 struct audit_buffer *audit_buf;
2206 __be32 net_spi;
2207 __be32 net_seq;
2208
2209 audit_buf = xfrm_audit_start("SA-icv-failure");
2210 if (audit_buf == NULL)
2211 return;
2212 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2213 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2214 u32 spi = ntohl(net_spi);
2215 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2216 spi, spi, ntohl(net_seq));
2217 }
2218 audit_log_end(audit_buf);
2219 }
2220 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2221 #endif /* CONFIG_AUDITSYSCALL */
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