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