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Merge tag 'kvm-3.9-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[mirror_ubuntu-focal-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 DEFINE_SPINLOCK(xfrm_type_lock);
172 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
173 {
174 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
175 const struct xfrm_type **typemap;
176 int err = 0;
177
178 if (unlikely(afinfo == NULL))
179 return -EAFNOSUPPORT;
180 typemap = afinfo->type_map;
181 spin_lock_bh(&xfrm_type_lock);
182
183 if (likely(typemap[type->proto] == NULL))
184 typemap[type->proto] = type;
185 else
186 err = -EEXIST;
187 spin_unlock_bh(&xfrm_type_lock);
188 xfrm_state_put_afinfo(afinfo);
189 return err;
190 }
191 EXPORT_SYMBOL(xfrm_register_type);
192
193 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
194 {
195 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
196 const struct xfrm_type **typemap;
197 int err = 0;
198
199 if (unlikely(afinfo == NULL))
200 return -EAFNOSUPPORT;
201 typemap = afinfo->type_map;
202 spin_lock_bh(&xfrm_type_lock);
203
204 if (unlikely(typemap[type->proto] != type))
205 err = -ENOENT;
206 else
207 typemap[type->proto] = NULL;
208 spin_unlock_bh(&xfrm_type_lock);
209 xfrm_state_put_afinfo(afinfo);
210 return err;
211 }
212 EXPORT_SYMBOL(xfrm_unregister_type);
213
214 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
215 {
216 struct xfrm_state_afinfo *afinfo;
217 const struct xfrm_type **typemap;
218 const struct xfrm_type *type;
219 int modload_attempted = 0;
220
221 retry:
222 afinfo = xfrm_state_get_afinfo(family);
223 if (unlikely(afinfo == NULL))
224 return NULL;
225 typemap = afinfo->type_map;
226
227 type = typemap[proto];
228 if (unlikely(type && !try_module_get(type->owner)))
229 type = NULL;
230 if (!type && !modload_attempted) {
231 xfrm_state_put_afinfo(afinfo);
232 request_module("xfrm-type-%d-%d", family, proto);
233 modload_attempted = 1;
234 goto retry;
235 }
236
237 xfrm_state_put_afinfo(afinfo);
238 return type;
239 }
240
241 static void xfrm_put_type(const struct xfrm_type *type)
242 {
243 module_put(type->owner);
244 }
245
246 static DEFINE_SPINLOCK(xfrm_mode_lock);
247 int xfrm_register_mode(struct xfrm_mode *mode, int family)
248 {
249 struct xfrm_state_afinfo *afinfo;
250 struct xfrm_mode **modemap;
251 int err;
252
253 if (unlikely(mode->encap >= XFRM_MODE_MAX))
254 return -EINVAL;
255
256 afinfo = xfrm_state_get_afinfo(family);
257 if (unlikely(afinfo == NULL))
258 return -EAFNOSUPPORT;
259
260 err = -EEXIST;
261 modemap = afinfo->mode_map;
262 spin_lock_bh(&xfrm_mode_lock);
263 if (modemap[mode->encap])
264 goto out;
265
266 err = -ENOENT;
267 if (!try_module_get(afinfo->owner))
268 goto out;
269
270 mode->afinfo = afinfo;
271 modemap[mode->encap] = mode;
272 err = 0;
273
274 out:
275 spin_unlock_bh(&xfrm_mode_lock);
276 xfrm_state_put_afinfo(afinfo);
277 return err;
278 }
279 EXPORT_SYMBOL(xfrm_register_mode);
280
281 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
282 {
283 struct xfrm_state_afinfo *afinfo;
284 struct xfrm_mode **modemap;
285 int err;
286
287 if (unlikely(mode->encap >= XFRM_MODE_MAX))
288 return -EINVAL;
289
290 afinfo = xfrm_state_get_afinfo(family);
291 if (unlikely(afinfo == NULL))
292 return -EAFNOSUPPORT;
293
294 err = -ENOENT;
295 modemap = afinfo->mode_map;
296 spin_lock_bh(&xfrm_mode_lock);
297 if (likely(modemap[mode->encap] == mode)) {
298 modemap[mode->encap] = NULL;
299 module_put(mode->afinfo->owner);
300 err = 0;
301 }
302
303 spin_unlock_bh(&xfrm_mode_lock);
304 xfrm_state_put_afinfo(afinfo);
305 return err;
306 }
307 EXPORT_SYMBOL(xfrm_unregister_mode);
308
309 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
310 {
311 struct xfrm_state_afinfo *afinfo;
312 struct xfrm_mode *mode;
313 int modload_attempted = 0;
314
315 if (unlikely(encap >= XFRM_MODE_MAX))
316 return NULL;
317
318 retry:
319 afinfo = xfrm_state_get_afinfo(family);
320 if (unlikely(afinfo == NULL))
321 return NULL;
322
323 mode = afinfo->mode_map[encap];
324 if (unlikely(mode && !try_module_get(mode->owner)))
325 mode = NULL;
326 if (!mode && !modload_attempted) {
327 xfrm_state_put_afinfo(afinfo);
328 request_module("xfrm-mode-%d-%d", family, encap);
329 modload_attempted = 1;
330 goto retry;
331 }
332
333 xfrm_state_put_afinfo(afinfo);
334 return mode;
335 }
336
337 static void xfrm_put_mode(struct xfrm_mode *mode)
338 {
339 module_put(mode->owner);
340 }
341
342 static void xfrm_state_gc_destroy(struct xfrm_state *x)
343 {
344 tasklet_hrtimer_cancel(&x->mtimer);
345 del_timer_sync(&x->rtimer);
346 kfree(x->aalg);
347 kfree(x->ealg);
348 kfree(x->calg);
349 kfree(x->encap);
350 kfree(x->coaddr);
351 kfree(x->replay_esn);
352 kfree(x->preplay_esn);
353 if (x->inner_mode)
354 xfrm_put_mode(x->inner_mode);
355 if (x->inner_mode_iaf)
356 xfrm_put_mode(x->inner_mode_iaf);
357 if (x->outer_mode)
358 xfrm_put_mode(x->outer_mode);
359 if (x->type) {
360 x->type->destructor(x);
361 xfrm_put_type(x->type);
362 }
363 security_xfrm_state_free(x);
364 kfree(x);
365 }
366
367 static void xfrm_state_gc_task(struct work_struct *work)
368 {
369 struct net *net = container_of(work, struct net, xfrm.state_gc_work);
370 struct xfrm_state *x;
371 struct hlist_node *entry, *tmp;
372 struct hlist_head gc_list;
373
374 spin_lock_bh(&xfrm_state_gc_lock);
375 hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
376 spin_unlock_bh(&xfrm_state_gc_lock);
377
378 hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist)
379 xfrm_state_gc_destroy(x);
380
381 wake_up(&net->xfrm.km_waitq);
382 }
383
384 static inline unsigned long make_jiffies(long secs)
385 {
386 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
387 return MAX_SCHEDULE_TIMEOUT-1;
388 else
389 return secs*HZ;
390 }
391
392 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
393 {
394 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
395 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
396 struct net *net = xs_net(x);
397 unsigned long now = get_seconds();
398 long next = LONG_MAX;
399 int warn = 0;
400 int err = 0;
401
402 spin_lock(&x->lock);
403 if (x->km.state == XFRM_STATE_DEAD)
404 goto out;
405 if (x->km.state == XFRM_STATE_EXPIRED)
406 goto expired;
407 if (x->lft.hard_add_expires_seconds) {
408 long tmo = x->lft.hard_add_expires_seconds +
409 x->curlft.add_time - now;
410 if (tmo <= 0) {
411 if (x->xflags & XFRM_SOFT_EXPIRE) {
412 /* enter hard expire without soft expire first?!
413 * setting a new date could trigger this.
414 * workarbound: fix x->curflt.add_time by below:
415 */
416 x->curlft.add_time = now - x->saved_tmo - 1;
417 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
418 } else
419 goto expired;
420 }
421 if (tmo < next)
422 next = tmo;
423 }
424 if (x->lft.hard_use_expires_seconds) {
425 long tmo = x->lft.hard_use_expires_seconds +
426 (x->curlft.use_time ? : now) - now;
427 if (tmo <= 0)
428 goto expired;
429 if (tmo < next)
430 next = tmo;
431 }
432 if (x->km.dying)
433 goto resched;
434 if (x->lft.soft_add_expires_seconds) {
435 long tmo = x->lft.soft_add_expires_seconds +
436 x->curlft.add_time - now;
437 if (tmo <= 0) {
438 warn = 1;
439 x->xflags &= ~XFRM_SOFT_EXPIRE;
440 } else if (tmo < next) {
441 next = tmo;
442 x->xflags |= XFRM_SOFT_EXPIRE;
443 x->saved_tmo = tmo;
444 }
445 }
446 if (x->lft.soft_use_expires_seconds) {
447 long tmo = x->lft.soft_use_expires_seconds +
448 (x->curlft.use_time ? : now) - now;
449 if (tmo <= 0)
450 warn = 1;
451 else if (tmo < next)
452 next = tmo;
453 }
454
455 x->km.dying = warn;
456 if (warn)
457 km_state_expired(x, 0, 0);
458 resched:
459 if (next != LONG_MAX){
460 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
461 }
462
463 goto out;
464
465 expired:
466 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
467 x->km.state = XFRM_STATE_EXPIRED;
468 wake_up(&net->xfrm.km_waitq);
469 next = 2;
470 goto resched;
471 }
472
473 err = __xfrm_state_delete(x);
474 if (!err && x->id.spi)
475 km_state_expired(x, 1, 0);
476
477 xfrm_audit_state_delete(x, err ? 0 : 1,
478 audit_get_loginuid(current),
479 audit_get_sessionid(current), 0);
480
481 out:
482 spin_unlock(&x->lock);
483 return HRTIMER_NORESTART;
484 }
485
486 static void xfrm_replay_timer_handler(unsigned long data);
487
488 struct xfrm_state *xfrm_state_alloc(struct net *net)
489 {
490 struct xfrm_state *x;
491
492 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
493
494 if (x) {
495 write_pnet(&x->xs_net, net);
496 atomic_set(&x->refcnt, 1);
497 atomic_set(&x->tunnel_users, 0);
498 INIT_LIST_HEAD(&x->km.all);
499 INIT_HLIST_NODE(&x->bydst);
500 INIT_HLIST_NODE(&x->bysrc);
501 INIT_HLIST_NODE(&x->byspi);
502 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS);
503 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
504 (unsigned long)x);
505 x->curlft.add_time = get_seconds();
506 x->lft.soft_byte_limit = XFRM_INF;
507 x->lft.soft_packet_limit = XFRM_INF;
508 x->lft.hard_byte_limit = XFRM_INF;
509 x->lft.hard_packet_limit = XFRM_INF;
510 x->replay_maxage = 0;
511 x->replay_maxdiff = 0;
512 x->inner_mode = NULL;
513 x->inner_mode_iaf = NULL;
514 spin_lock_init(&x->lock);
515 }
516 return x;
517 }
518 EXPORT_SYMBOL(xfrm_state_alloc);
519
520 void __xfrm_state_destroy(struct xfrm_state *x)
521 {
522 struct net *net = xs_net(x);
523
524 WARN_ON(x->km.state != XFRM_STATE_DEAD);
525
526 spin_lock_bh(&xfrm_state_gc_lock);
527 hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
528 spin_unlock_bh(&xfrm_state_gc_lock);
529 schedule_work(&net->xfrm.state_gc_work);
530 }
531 EXPORT_SYMBOL(__xfrm_state_destroy);
532
533 int __xfrm_state_delete(struct xfrm_state *x)
534 {
535 struct net *net = xs_net(x);
536 int err = -ESRCH;
537
538 if (x->km.state != XFRM_STATE_DEAD) {
539 x->km.state = XFRM_STATE_DEAD;
540 spin_lock(&xfrm_state_lock);
541 list_del(&x->km.all);
542 hlist_del(&x->bydst);
543 hlist_del(&x->bysrc);
544 if (x->id.spi)
545 hlist_del(&x->byspi);
546 net->xfrm.state_num--;
547 spin_unlock(&xfrm_state_lock);
548
549 /* All xfrm_state objects are created by xfrm_state_alloc.
550 * The xfrm_state_alloc call gives a reference, and that
551 * is what we are dropping here.
552 */
553 xfrm_state_put(x);
554 err = 0;
555 }
556
557 return err;
558 }
559 EXPORT_SYMBOL(__xfrm_state_delete);
560
561 int xfrm_state_delete(struct xfrm_state *x)
562 {
563 int err;
564
565 spin_lock_bh(&x->lock);
566 err = __xfrm_state_delete(x);
567 spin_unlock_bh(&x->lock);
568
569 return err;
570 }
571 EXPORT_SYMBOL(xfrm_state_delete);
572
573 #ifdef CONFIG_SECURITY_NETWORK_XFRM
574 static inline int
575 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
576 {
577 int i, err = 0;
578
579 for (i = 0; i <= net->xfrm.state_hmask; i++) {
580 struct hlist_node *entry;
581 struct xfrm_state *x;
582
583 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
584 if (xfrm_id_proto_match(x->id.proto, proto) &&
585 (err = security_xfrm_state_delete(x)) != 0) {
586 xfrm_audit_state_delete(x, 0,
587 audit_info->loginuid,
588 audit_info->sessionid,
589 audit_info->secid);
590 return err;
591 }
592 }
593 }
594
595 return err;
596 }
597 #else
598 static inline int
599 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
600 {
601 return 0;
602 }
603 #endif
604
605 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
606 {
607 int i, err = 0, cnt = 0;
608
609 spin_lock_bh(&xfrm_state_lock);
610 err = xfrm_state_flush_secctx_check(net, proto, audit_info);
611 if (err)
612 goto out;
613
614 err = -ESRCH;
615 for (i = 0; i <= net->xfrm.state_hmask; i++) {
616 struct hlist_node *entry;
617 struct xfrm_state *x;
618 restart:
619 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
620 if (!xfrm_state_kern(x) &&
621 xfrm_id_proto_match(x->id.proto, proto)) {
622 xfrm_state_hold(x);
623 spin_unlock_bh(&xfrm_state_lock);
624
625 err = xfrm_state_delete(x);
626 xfrm_audit_state_delete(x, err ? 0 : 1,
627 audit_info->loginuid,
628 audit_info->sessionid,
629 audit_info->secid);
630 xfrm_state_put(x);
631 if (!err)
632 cnt++;
633
634 spin_lock_bh(&xfrm_state_lock);
635 goto restart;
636 }
637 }
638 }
639 if (cnt)
640 err = 0;
641
642 out:
643 spin_unlock_bh(&xfrm_state_lock);
644 wake_up(&net->xfrm.km_waitq);
645 return err;
646 }
647 EXPORT_SYMBOL(xfrm_state_flush);
648
649 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
650 {
651 spin_lock_bh(&xfrm_state_lock);
652 si->sadcnt = net->xfrm.state_num;
653 si->sadhcnt = net->xfrm.state_hmask;
654 si->sadhmcnt = xfrm_state_hashmax;
655 spin_unlock_bh(&xfrm_state_lock);
656 }
657 EXPORT_SYMBOL(xfrm_sad_getinfo);
658
659 static int
660 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
661 const struct xfrm_tmpl *tmpl,
662 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
663 unsigned short family)
664 {
665 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
666 if (!afinfo)
667 return -1;
668 afinfo->init_tempsel(&x->sel, fl);
669
670 if (family != tmpl->encap_family) {
671 xfrm_state_put_afinfo(afinfo);
672 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
673 if (!afinfo)
674 return -1;
675 }
676 afinfo->init_temprop(x, tmpl, daddr, saddr);
677 xfrm_state_put_afinfo(afinfo);
678 return 0;
679 }
680
681 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
682 const xfrm_address_t *daddr,
683 __be32 spi, u8 proto,
684 unsigned short family)
685 {
686 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
687 struct xfrm_state *x;
688 struct hlist_node *entry;
689
690 hlist_for_each_entry(x, entry, net->xfrm.state_byspi+h, byspi) {
691 if (x->props.family != family ||
692 x->id.spi != spi ||
693 x->id.proto != proto ||
694 !xfrm_addr_equal(&x->id.daddr, daddr, family))
695 continue;
696
697 if ((mark & x->mark.m) != x->mark.v)
698 continue;
699 xfrm_state_hold(x);
700 return x;
701 }
702
703 return NULL;
704 }
705
706 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
707 const xfrm_address_t *daddr,
708 const xfrm_address_t *saddr,
709 u8 proto, unsigned short family)
710 {
711 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
712 struct xfrm_state *x;
713 struct hlist_node *entry;
714
715 hlist_for_each_entry(x, entry, net->xfrm.state_bysrc+h, bysrc) {
716 if (x->props.family != family ||
717 x->id.proto != proto ||
718 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
719 !xfrm_addr_equal(&x->props.saddr, saddr, family))
720 continue;
721
722 if ((mark & x->mark.m) != x->mark.v)
723 continue;
724 xfrm_state_hold(x);
725 return x;
726 }
727
728 return NULL;
729 }
730
731 static inline struct xfrm_state *
732 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
733 {
734 struct net *net = xs_net(x);
735 u32 mark = x->mark.v & x->mark.m;
736
737 if (use_spi)
738 return __xfrm_state_lookup(net, mark, &x->id.daddr,
739 x->id.spi, x->id.proto, family);
740 else
741 return __xfrm_state_lookup_byaddr(net, mark,
742 &x->id.daddr,
743 &x->props.saddr,
744 x->id.proto, family);
745 }
746
747 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
748 {
749 if (have_hash_collision &&
750 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
751 net->xfrm.state_num > net->xfrm.state_hmask)
752 schedule_work(&net->xfrm.state_hash_work);
753 }
754
755 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
756 const struct flowi *fl, unsigned short family,
757 struct xfrm_state **best, int *acq_in_progress,
758 int *error)
759 {
760 /* Resolution logic:
761 * 1. There is a valid state with matching selector. Done.
762 * 2. Valid state with inappropriate selector. Skip.
763 *
764 * Entering area of "sysdeps".
765 *
766 * 3. If state is not valid, selector is temporary, it selects
767 * only session which triggered previous resolution. Key
768 * manager will do something to install a state with proper
769 * selector.
770 */
771 if (x->km.state == XFRM_STATE_VALID) {
772 if ((x->sel.family &&
773 !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
774 !security_xfrm_state_pol_flow_match(x, pol, fl))
775 return;
776
777 if (!*best ||
778 (*best)->km.dying > x->km.dying ||
779 ((*best)->km.dying == x->km.dying &&
780 (*best)->curlft.add_time < x->curlft.add_time))
781 *best = x;
782 } else if (x->km.state == XFRM_STATE_ACQ) {
783 *acq_in_progress = 1;
784 } else if (x->km.state == XFRM_STATE_ERROR ||
785 x->km.state == XFRM_STATE_EXPIRED) {
786 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
787 security_xfrm_state_pol_flow_match(x, pol, fl))
788 *error = -ESRCH;
789 }
790 }
791
792 struct xfrm_state *
793 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
794 const struct flowi *fl, struct xfrm_tmpl *tmpl,
795 struct xfrm_policy *pol, int *err,
796 unsigned short family)
797 {
798 static xfrm_address_t saddr_wildcard = { };
799 struct net *net = xp_net(pol);
800 unsigned int h, h_wildcard;
801 struct hlist_node *entry;
802 struct xfrm_state *x, *x0, *to_put;
803 int acquire_in_progress = 0;
804 int error = 0;
805 struct xfrm_state *best = NULL;
806 u32 mark = pol->mark.v & pol->mark.m;
807 unsigned short encap_family = tmpl->encap_family;
808
809 to_put = NULL;
810
811 spin_lock_bh(&xfrm_state_lock);
812 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
813 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
814 if (x->props.family == encap_family &&
815 x->props.reqid == tmpl->reqid &&
816 (mark & x->mark.m) == x->mark.v &&
817 !(x->props.flags & XFRM_STATE_WILDRECV) &&
818 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
819 tmpl->mode == x->props.mode &&
820 tmpl->id.proto == x->id.proto &&
821 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
822 xfrm_state_look_at(pol, x, fl, encap_family,
823 &best, &acquire_in_progress, &error);
824 }
825 if (best)
826 goto found;
827
828 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
829 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h_wildcard, bydst) {
830 if (x->props.family == encap_family &&
831 x->props.reqid == tmpl->reqid &&
832 (mark & x->mark.m) == x->mark.v &&
833 !(x->props.flags & XFRM_STATE_WILDRECV) &&
834 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
835 tmpl->mode == x->props.mode &&
836 tmpl->id.proto == x->id.proto &&
837 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
838 xfrm_state_look_at(pol, x, fl, encap_family,
839 &best, &acquire_in_progress, &error);
840 }
841
842 found:
843 x = best;
844 if (!x && !error && !acquire_in_progress) {
845 if (tmpl->id.spi &&
846 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
847 tmpl->id.proto, encap_family)) != NULL) {
848 to_put = x0;
849 error = -EEXIST;
850 goto out;
851 }
852 x = xfrm_state_alloc(net);
853 if (x == NULL) {
854 error = -ENOMEM;
855 goto out;
856 }
857 /* Initialize temporary state matching only
858 * to current session. */
859 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
860 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
861
862 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
863 if (error) {
864 x->km.state = XFRM_STATE_DEAD;
865 to_put = x;
866 x = NULL;
867 goto out;
868 }
869
870 if (km_query(x, tmpl, pol) == 0) {
871 x->km.state = XFRM_STATE_ACQ;
872 list_add(&x->km.all, &net->xfrm.state_all);
873 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
874 h = xfrm_src_hash(net, daddr, saddr, encap_family);
875 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
876 if (x->id.spi) {
877 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
878 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
879 }
880 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
881 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
882 net->xfrm.state_num++;
883 xfrm_hash_grow_check(net, x->bydst.next != NULL);
884 } else {
885 x->km.state = XFRM_STATE_DEAD;
886 to_put = x;
887 x = NULL;
888 error = -ESRCH;
889 }
890 }
891 out:
892 if (x)
893 xfrm_state_hold(x);
894 else
895 *err = acquire_in_progress ? -EAGAIN : error;
896 spin_unlock_bh(&xfrm_state_lock);
897 if (to_put)
898 xfrm_state_put(to_put);
899 return x;
900 }
901
902 struct xfrm_state *
903 xfrm_stateonly_find(struct net *net, u32 mark,
904 xfrm_address_t *daddr, xfrm_address_t *saddr,
905 unsigned short family, u8 mode, u8 proto, u32 reqid)
906 {
907 unsigned int h;
908 struct xfrm_state *rx = NULL, *x = NULL;
909 struct hlist_node *entry;
910
911 spin_lock(&xfrm_state_lock);
912 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
913 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
914 if (x->props.family == family &&
915 x->props.reqid == reqid &&
916 (mark & x->mark.m) == x->mark.v &&
917 !(x->props.flags & XFRM_STATE_WILDRECV) &&
918 xfrm_state_addr_check(x, daddr, saddr, family) &&
919 mode == x->props.mode &&
920 proto == x->id.proto &&
921 x->km.state == XFRM_STATE_VALID) {
922 rx = x;
923 break;
924 }
925 }
926
927 if (rx)
928 xfrm_state_hold(rx);
929 spin_unlock(&xfrm_state_lock);
930
931
932 return rx;
933 }
934 EXPORT_SYMBOL(xfrm_stateonly_find);
935
936 static void __xfrm_state_insert(struct xfrm_state *x)
937 {
938 struct net *net = xs_net(x);
939 unsigned int h;
940
941 list_add(&x->km.all, &net->xfrm.state_all);
942
943 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
944 x->props.reqid, x->props.family);
945 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
946
947 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
948 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
949
950 if (x->id.spi) {
951 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
952 x->props.family);
953
954 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
955 }
956
957 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
958 if (x->replay_maxage)
959 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
960
961 wake_up(&net->xfrm.km_waitq);
962
963 net->xfrm.state_num++;
964
965 xfrm_hash_grow_check(net, x->bydst.next != NULL);
966 }
967
968 /* xfrm_state_lock is held */
969 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
970 {
971 struct net *net = xs_net(xnew);
972 unsigned short family = xnew->props.family;
973 u32 reqid = xnew->props.reqid;
974 struct xfrm_state *x;
975 struct hlist_node *entry;
976 unsigned int h;
977 u32 mark = xnew->mark.v & xnew->mark.m;
978
979 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
980 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
981 if (x->props.family == family &&
982 x->props.reqid == reqid &&
983 (mark & x->mark.m) == x->mark.v &&
984 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
985 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
986 x->genid++;
987 }
988 }
989
990 void xfrm_state_insert(struct xfrm_state *x)
991 {
992 spin_lock_bh(&xfrm_state_lock);
993 __xfrm_state_bump_genids(x);
994 __xfrm_state_insert(x);
995 spin_unlock_bh(&xfrm_state_lock);
996 }
997 EXPORT_SYMBOL(xfrm_state_insert);
998
999 /* xfrm_state_lock is held */
1000 static struct xfrm_state *__find_acq_core(struct net *net, struct xfrm_mark *m,
1001 unsigned short family, u8 mode,
1002 u32 reqid, u8 proto,
1003 const xfrm_address_t *daddr,
1004 const xfrm_address_t *saddr, int create)
1005 {
1006 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1007 struct hlist_node *entry;
1008 struct xfrm_state *x;
1009 u32 mark = m->v & m->m;
1010
1011 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+h, bydst) {
1012 if (x->props.reqid != reqid ||
1013 x->props.mode != mode ||
1014 x->props.family != family ||
1015 x->km.state != XFRM_STATE_ACQ ||
1016 x->id.spi != 0 ||
1017 x->id.proto != proto ||
1018 (mark & x->mark.m) != x->mark.v ||
1019 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1020 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1021 continue;
1022
1023 xfrm_state_hold(x);
1024 return x;
1025 }
1026
1027 if (!create)
1028 return NULL;
1029
1030 x = xfrm_state_alloc(net);
1031 if (likely(x)) {
1032 switch (family) {
1033 case AF_INET:
1034 x->sel.daddr.a4 = daddr->a4;
1035 x->sel.saddr.a4 = saddr->a4;
1036 x->sel.prefixlen_d = 32;
1037 x->sel.prefixlen_s = 32;
1038 x->props.saddr.a4 = saddr->a4;
1039 x->id.daddr.a4 = daddr->a4;
1040 break;
1041
1042 case AF_INET6:
1043 *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr;
1044 *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr;
1045 x->sel.prefixlen_d = 128;
1046 x->sel.prefixlen_s = 128;
1047 *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr;
1048 *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr;
1049 break;
1050 }
1051
1052 x->km.state = XFRM_STATE_ACQ;
1053 x->id.proto = proto;
1054 x->props.family = family;
1055 x->props.mode = mode;
1056 x->props.reqid = reqid;
1057 x->mark.v = m->v;
1058 x->mark.m = m->m;
1059 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1060 xfrm_state_hold(x);
1061 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1062 list_add(&x->km.all, &net->xfrm.state_all);
1063 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1064 h = xfrm_src_hash(net, daddr, saddr, family);
1065 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1066
1067 net->xfrm.state_num++;
1068
1069 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1070 }
1071
1072 return x;
1073 }
1074
1075 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1076
1077 int xfrm_state_add(struct xfrm_state *x)
1078 {
1079 struct net *net = xs_net(x);
1080 struct xfrm_state *x1, *to_put;
1081 int family;
1082 int err;
1083 u32 mark = x->mark.v & x->mark.m;
1084 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1085
1086 family = x->props.family;
1087
1088 to_put = NULL;
1089
1090 spin_lock_bh(&xfrm_state_lock);
1091
1092 x1 = __xfrm_state_locate(x, use_spi, family);
1093 if (x1) {
1094 to_put = x1;
1095 x1 = NULL;
1096 err = -EEXIST;
1097 goto out;
1098 }
1099
1100 if (use_spi && x->km.seq) {
1101 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1102 if (x1 && ((x1->id.proto != x->id.proto) ||
1103 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1104 to_put = x1;
1105 x1 = NULL;
1106 }
1107 }
1108
1109 if (use_spi && !x1)
1110 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1111 x->props.reqid, x->id.proto,
1112 &x->id.daddr, &x->props.saddr, 0);
1113
1114 __xfrm_state_bump_genids(x);
1115 __xfrm_state_insert(x);
1116 err = 0;
1117
1118 out:
1119 spin_unlock_bh(&xfrm_state_lock);
1120
1121 if (x1) {
1122 xfrm_state_delete(x1);
1123 xfrm_state_put(x1);
1124 }
1125
1126 if (to_put)
1127 xfrm_state_put(to_put);
1128
1129 return err;
1130 }
1131 EXPORT_SYMBOL(xfrm_state_add);
1132
1133 #ifdef CONFIG_XFRM_MIGRATE
1134 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1135 {
1136 struct net *net = xs_net(orig);
1137 int err = -ENOMEM;
1138 struct xfrm_state *x = xfrm_state_alloc(net);
1139 if (!x)
1140 goto out;
1141
1142 memcpy(&x->id, &orig->id, sizeof(x->id));
1143 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1144 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1145 x->props.mode = orig->props.mode;
1146 x->props.replay_window = orig->props.replay_window;
1147 x->props.reqid = orig->props.reqid;
1148 x->props.family = orig->props.family;
1149 x->props.saddr = orig->props.saddr;
1150
1151 if (orig->aalg) {
1152 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1153 if (!x->aalg)
1154 goto error;
1155 }
1156 x->props.aalgo = orig->props.aalgo;
1157
1158 if (orig->ealg) {
1159 x->ealg = xfrm_algo_clone(orig->ealg);
1160 if (!x->ealg)
1161 goto error;
1162 }
1163 x->props.ealgo = orig->props.ealgo;
1164
1165 if (orig->calg) {
1166 x->calg = xfrm_algo_clone(orig->calg);
1167 if (!x->calg)
1168 goto error;
1169 }
1170 x->props.calgo = orig->props.calgo;
1171
1172 if (orig->encap) {
1173 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1174 if (!x->encap)
1175 goto error;
1176 }
1177
1178 if (orig->coaddr) {
1179 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1180 GFP_KERNEL);
1181 if (!x->coaddr)
1182 goto error;
1183 }
1184
1185 if (orig->replay_esn) {
1186 err = xfrm_replay_clone(x, orig);
1187 if (err)
1188 goto error;
1189 }
1190
1191 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1192
1193 err = xfrm_init_state(x);
1194 if (err)
1195 goto error;
1196
1197 x->props.flags = orig->props.flags;
1198
1199 x->curlft.add_time = orig->curlft.add_time;
1200 x->km.state = orig->km.state;
1201 x->km.seq = orig->km.seq;
1202
1203 return x;
1204
1205 error:
1206 xfrm_state_put(x);
1207 out:
1208 if (errp)
1209 *errp = err;
1210 return NULL;
1211 }
1212
1213 /* xfrm_state_lock is held */
1214 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1215 {
1216 unsigned int h;
1217 struct xfrm_state *x;
1218 struct hlist_node *entry;
1219
1220 if (m->reqid) {
1221 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1222 m->reqid, m->old_family);
1223 hlist_for_each_entry(x, entry, init_net.xfrm.state_bydst+h, bydst) {
1224 if (x->props.mode != m->mode ||
1225 x->id.proto != m->proto)
1226 continue;
1227 if (m->reqid && x->props.reqid != m->reqid)
1228 continue;
1229 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1230 m->old_family) ||
1231 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1232 m->old_family))
1233 continue;
1234 xfrm_state_hold(x);
1235 return x;
1236 }
1237 } else {
1238 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1239 m->old_family);
1240 hlist_for_each_entry(x, entry, init_net.xfrm.state_bysrc+h, bysrc) {
1241 if (x->props.mode != m->mode ||
1242 x->id.proto != m->proto)
1243 continue;
1244 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1245 m->old_family) ||
1246 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1247 m->old_family))
1248 continue;
1249 xfrm_state_hold(x);
1250 return x;
1251 }
1252 }
1253
1254 return NULL;
1255 }
1256 EXPORT_SYMBOL(xfrm_migrate_state_find);
1257
1258 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1259 struct xfrm_migrate *m)
1260 {
1261 struct xfrm_state *xc;
1262 int err;
1263
1264 xc = xfrm_state_clone(x, &err);
1265 if (!xc)
1266 return NULL;
1267
1268 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1269 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1270
1271 /* add state */
1272 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1273 /* a care is needed when the destination address of the
1274 state is to be updated as it is a part of triplet */
1275 xfrm_state_insert(xc);
1276 } else {
1277 if ((err = xfrm_state_add(xc)) < 0)
1278 goto error;
1279 }
1280
1281 return xc;
1282 error:
1283 xfrm_state_put(xc);
1284 return NULL;
1285 }
1286 EXPORT_SYMBOL(xfrm_state_migrate);
1287 #endif
1288
1289 int xfrm_state_update(struct xfrm_state *x)
1290 {
1291 struct xfrm_state *x1, *to_put;
1292 int err;
1293 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1294
1295 to_put = NULL;
1296
1297 spin_lock_bh(&xfrm_state_lock);
1298 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1299
1300 err = -ESRCH;
1301 if (!x1)
1302 goto out;
1303
1304 if (xfrm_state_kern(x1)) {
1305 to_put = x1;
1306 err = -EEXIST;
1307 goto out;
1308 }
1309
1310 if (x1->km.state == XFRM_STATE_ACQ) {
1311 __xfrm_state_insert(x);
1312 x = NULL;
1313 }
1314 err = 0;
1315
1316 out:
1317 spin_unlock_bh(&xfrm_state_lock);
1318
1319 if (to_put)
1320 xfrm_state_put(to_put);
1321
1322 if (err)
1323 return err;
1324
1325 if (!x) {
1326 xfrm_state_delete(x1);
1327 xfrm_state_put(x1);
1328 return 0;
1329 }
1330
1331 err = -EINVAL;
1332 spin_lock_bh(&x1->lock);
1333 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1334 if (x->encap && x1->encap)
1335 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1336 if (x->coaddr && x1->coaddr) {
1337 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1338 }
1339 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1340 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1341 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1342 x1->km.dying = 0;
1343
1344 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1345 if (x1->curlft.use_time)
1346 xfrm_state_check_expire(x1);
1347
1348 err = 0;
1349 x->km.state = XFRM_STATE_DEAD;
1350 __xfrm_state_put(x);
1351 }
1352 spin_unlock_bh(&x1->lock);
1353
1354 xfrm_state_put(x1);
1355
1356 return err;
1357 }
1358 EXPORT_SYMBOL(xfrm_state_update);
1359
1360 int xfrm_state_check_expire(struct xfrm_state *x)
1361 {
1362 if (!x->curlft.use_time)
1363 x->curlft.use_time = get_seconds();
1364
1365 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1366 x->curlft.packets >= x->lft.hard_packet_limit) {
1367 x->km.state = XFRM_STATE_EXPIRED;
1368 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
1369 return -EINVAL;
1370 }
1371
1372 if (!x->km.dying &&
1373 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1374 x->curlft.packets >= x->lft.soft_packet_limit)) {
1375 x->km.dying = 1;
1376 km_state_expired(x, 0, 0);
1377 }
1378 return 0;
1379 }
1380 EXPORT_SYMBOL(xfrm_state_check_expire);
1381
1382 struct xfrm_state *
1383 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1384 u8 proto, unsigned short family)
1385 {
1386 struct xfrm_state *x;
1387
1388 spin_lock_bh(&xfrm_state_lock);
1389 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1390 spin_unlock_bh(&xfrm_state_lock);
1391 return x;
1392 }
1393 EXPORT_SYMBOL(xfrm_state_lookup);
1394
1395 struct xfrm_state *
1396 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1397 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1398 u8 proto, unsigned short family)
1399 {
1400 struct xfrm_state *x;
1401
1402 spin_lock_bh(&xfrm_state_lock);
1403 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1404 spin_unlock_bh(&xfrm_state_lock);
1405 return x;
1406 }
1407 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1408
1409 struct xfrm_state *
1410 xfrm_find_acq(struct net *net, struct xfrm_mark *mark, u8 mode, u32 reqid, u8 proto,
1411 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1412 int create, unsigned short family)
1413 {
1414 struct xfrm_state *x;
1415
1416 spin_lock_bh(&xfrm_state_lock);
1417 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1418 spin_unlock_bh(&xfrm_state_lock);
1419
1420 return x;
1421 }
1422 EXPORT_SYMBOL(xfrm_find_acq);
1423
1424 #ifdef CONFIG_XFRM_SUB_POLICY
1425 int
1426 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1427 unsigned short family)
1428 {
1429 int err = 0;
1430 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1431 if (!afinfo)
1432 return -EAFNOSUPPORT;
1433
1434 spin_lock_bh(&xfrm_state_lock);
1435 if (afinfo->tmpl_sort)
1436 err = afinfo->tmpl_sort(dst, src, n);
1437 spin_unlock_bh(&xfrm_state_lock);
1438 xfrm_state_put_afinfo(afinfo);
1439 return err;
1440 }
1441 EXPORT_SYMBOL(xfrm_tmpl_sort);
1442
1443 int
1444 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1445 unsigned short family)
1446 {
1447 int err = 0;
1448 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1449 if (!afinfo)
1450 return -EAFNOSUPPORT;
1451
1452 spin_lock_bh(&xfrm_state_lock);
1453 if (afinfo->state_sort)
1454 err = afinfo->state_sort(dst, src, n);
1455 spin_unlock_bh(&xfrm_state_lock);
1456 xfrm_state_put_afinfo(afinfo);
1457 return err;
1458 }
1459 EXPORT_SYMBOL(xfrm_state_sort);
1460 #endif
1461
1462 /* Silly enough, but I'm lazy to build resolution list */
1463
1464 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1465 {
1466 int i;
1467
1468 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1469 struct hlist_node *entry;
1470 struct xfrm_state *x;
1471
1472 hlist_for_each_entry(x, entry, net->xfrm.state_bydst+i, bydst) {
1473 if (x->km.seq == seq &&
1474 (mark & x->mark.m) == x->mark.v &&
1475 x->km.state == XFRM_STATE_ACQ) {
1476 xfrm_state_hold(x);
1477 return x;
1478 }
1479 }
1480 }
1481 return NULL;
1482 }
1483
1484 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1485 {
1486 struct xfrm_state *x;
1487
1488 spin_lock_bh(&xfrm_state_lock);
1489 x = __xfrm_find_acq_byseq(net, mark, seq);
1490 spin_unlock_bh(&xfrm_state_lock);
1491 return x;
1492 }
1493 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1494
1495 u32 xfrm_get_acqseq(void)
1496 {
1497 u32 res;
1498 static atomic_t acqseq;
1499
1500 do {
1501 res = atomic_inc_return(&acqseq);
1502 } while (!res);
1503
1504 return res;
1505 }
1506 EXPORT_SYMBOL(xfrm_get_acqseq);
1507
1508 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1509 {
1510 struct net *net = xs_net(x);
1511 unsigned int h;
1512 struct xfrm_state *x0;
1513 int err = -ENOENT;
1514 __be32 minspi = htonl(low);
1515 __be32 maxspi = htonl(high);
1516 u32 mark = x->mark.v & x->mark.m;
1517
1518 spin_lock_bh(&x->lock);
1519 if (x->km.state == XFRM_STATE_DEAD)
1520 goto unlock;
1521
1522 err = 0;
1523 if (x->id.spi)
1524 goto unlock;
1525
1526 err = -ENOENT;
1527
1528 if (minspi == maxspi) {
1529 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1530 if (x0) {
1531 xfrm_state_put(x0);
1532 goto unlock;
1533 }
1534 x->id.spi = minspi;
1535 } else {
1536 u32 spi = 0;
1537 for (h=0; h<high-low+1; h++) {
1538 spi = low + net_random()%(high-low+1);
1539 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1540 if (x0 == NULL) {
1541 x->id.spi = htonl(spi);
1542 break;
1543 }
1544 xfrm_state_put(x0);
1545 }
1546 }
1547 if (x->id.spi) {
1548 spin_lock_bh(&xfrm_state_lock);
1549 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1550 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1551 spin_unlock_bh(&xfrm_state_lock);
1552
1553 err = 0;
1554 }
1555
1556 unlock:
1557 spin_unlock_bh(&x->lock);
1558
1559 return err;
1560 }
1561 EXPORT_SYMBOL(xfrm_alloc_spi);
1562
1563 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1564 int (*func)(struct xfrm_state *, int, void*),
1565 void *data)
1566 {
1567 struct xfrm_state *state;
1568 struct xfrm_state_walk *x;
1569 int err = 0;
1570
1571 if (walk->seq != 0 && list_empty(&walk->all))
1572 return 0;
1573
1574 spin_lock_bh(&xfrm_state_lock);
1575 if (list_empty(&walk->all))
1576 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1577 else
1578 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1579 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1580 if (x->state == XFRM_STATE_DEAD)
1581 continue;
1582 state = container_of(x, struct xfrm_state, km);
1583 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1584 continue;
1585 err = func(state, walk->seq, data);
1586 if (err) {
1587 list_move_tail(&walk->all, &x->all);
1588 goto out;
1589 }
1590 walk->seq++;
1591 }
1592 if (walk->seq == 0) {
1593 err = -ENOENT;
1594 goto out;
1595 }
1596 list_del_init(&walk->all);
1597 out:
1598 spin_unlock_bh(&xfrm_state_lock);
1599 return err;
1600 }
1601 EXPORT_SYMBOL(xfrm_state_walk);
1602
1603 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1604 {
1605 INIT_LIST_HEAD(&walk->all);
1606 walk->proto = proto;
1607 walk->state = XFRM_STATE_DEAD;
1608 walk->seq = 0;
1609 }
1610 EXPORT_SYMBOL(xfrm_state_walk_init);
1611
1612 void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1613 {
1614 if (list_empty(&walk->all))
1615 return;
1616
1617 spin_lock_bh(&xfrm_state_lock);
1618 list_del(&walk->all);
1619 spin_unlock_bh(&xfrm_state_lock);
1620 }
1621 EXPORT_SYMBOL(xfrm_state_walk_done);
1622
1623 static void xfrm_replay_timer_handler(unsigned long data)
1624 {
1625 struct xfrm_state *x = (struct xfrm_state*)data;
1626
1627 spin_lock(&x->lock);
1628
1629 if (x->km.state == XFRM_STATE_VALID) {
1630 if (xfrm_aevent_is_on(xs_net(x)))
1631 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1632 else
1633 x->xflags |= XFRM_TIME_DEFER;
1634 }
1635
1636 spin_unlock(&x->lock);
1637 }
1638
1639 static LIST_HEAD(xfrm_km_list);
1640
1641 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1642 {
1643 struct xfrm_mgr *km;
1644
1645 rcu_read_lock();
1646 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1647 if (km->notify_policy)
1648 km->notify_policy(xp, dir, c);
1649 rcu_read_unlock();
1650 }
1651
1652 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1653 {
1654 struct xfrm_mgr *km;
1655 rcu_read_lock();
1656 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1657 if (km->notify)
1658 km->notify(x, c);
1659 rcu_read_unlock();
1660 }
1661
1662 EXPORT_SYMBOL(km_policy_notify);
1663 EXPORT_SYMBOL(km_state_notify);
1664
1665 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1666 {
1667 struct net *net = xs_net(x);
1668 struct km_event c;
1669
1670 c.data.hard = hard;
1671 c.portid = portid;
1672 c.event = XFRM_MSG_EXPIRE;
1673 km_state_notify(x, &c);
1674
1675 if (hard)
1676 wake_up(&net->xfrm.km_waitq);
1677 }
1678
1679 EXPORT_SYMBOL(km_state_expired);
1680 /*
1681 * We send to all registered managers regardless of failure
1682 * We are happy with one success
1683 */
1684 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1685 {
1686 int err = -EINVAL, acqret;
1687 struct xfrm_mgr *km;
1688
1689 rcu_read_lock();
1690 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1691 acqret = km->acquire(x, t, pol);
1692 if (!acqret)
1693 err = acqret;
1694 }
1695 rcu_read_unlock();
1696 return err;
1697 }
1698 EXPORT_SYMBOL(km_query);
1699
1700 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1701 {
1702 int err = -EINVAL;
1703 struct xfrm_mgr *km;
1704
1705 rcu_read_lock();
1706 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1707 if (km->new_mapping)
1708 err = km->new_mapping(x, ipaddr, sport);
1709 if (!err)
1710 break;
1711 }
1712 rcu_read_unlock();
1713 return err;
1714 }
1715 EXPORT_SYMBOL(km_new_mapping);
1716
1717 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1718 {
1719 struct net *net = xp_net(pol);
1720 struct km_event c;
1721
1722 c.data.hard = hard;
1723 c.portid = portid;
1724 c.event = XFRM_MSG_POLEXPIRE;
1725 km_policy_notify(pol, dir, &c);
1726
1727 if (hard)
1728 wake_up(&net->xfrm.km_waitq);
1729 }
1730 EXPORT_SYMBOL(km_policy_expired);
1731
1732 #ifdef CONFIG_XFRM_MIGRATE
1733 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1734 const struct xfrm_migrate *m, int num_migrate,
1735 const struct xfrm_kmaddress *k)
1736 {
1737 int err = -EINVAL;
1738 int ret;
1739 struct xfrm_mgr *km;
1740
1741 rcu_read_lock();
1742 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1743 if (km->migrate) {
1744 ret = km->migrate(sel, dir, type, m, num_migrate, k);
1745 if (!ret)
1746 err = ret;
1747 }
1748 }
1749 rcu_read_unlock();
1750 return err;
1751 }
1752 EXPORT_SYMBOL(km_migrate);
1753 #endif
1754
1755 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1756 {
1757 int err = -EINVAL;
1758 int ret;
1759 struct xfrm_mgr *km;
1760
1761 rcu_read_lock();
1762 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1763 if (km->report) {
1764 ret = km->report(net, proto, sel, addr);
1765 if (!ret)
1766 err = ret;
1767 }
1768 }
1769 rcu_read_unlock();
1770 return err;
1771 }
1772 EXPORT_SYMBOL(km_report);
1773
1774 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1775 {
1776 int err;
1777 u8 *data;
1778 struct xfrm_mgr *km;
1779 struct xfrm_policy *pol = NULL;
1780
1781 if (optlen <= 0 || optlen > PAGE_SIZE)
1782 return -EMSGSIZE;
1783
1784 data = kmalloc(optlen, GFP_KERNEL);
1785 if (!data)
1786 return -ENOMEM;
1787
1788 err = -EFAULT;
1789 if (copy_from_user(data, optval, optlen))
1790 goto out;
1791
1792 err = -EINVAL;
1793 rcu_read_lock();
1794 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1795 pol = km->compile_policy(sk, optname, data,
1796 optlen, &err);
1797 if (err >= 0)
1798 break;
1799 }
1800 rcu_read_unlock();
1801
1802 if (err >= 0) {
1803 xfrm_sk_policy_insert(sk, err, pol);
1804 xfrm_pol_put(pol);
1805 err = 0;
1806 }
1807
1808 out:
1809 kfree(data);
1810 return err;
1811 }
1812 EXPORT_SYMBOL(xfrm_user_policy);
1813
1814 static DEFINE_SPINLOCK(xfrm_km_lock);
1815
1816 int xfrm_register_km(struct xfrm_mgr *km)
1817 {
1818 spin_lock_bh(&xfrm_km_lock);
1819 list_add_tail_rcu(&km->list, &xfrm_km_list);
1820 spin_unlock_bh(&xfrm_km_lock);
1821 return 0;
1822 }
1823 EXPORT_SYMBOL(xfrm_register_km);
1824
1825 int xfrm_unregister_km(struct xfrm_mgr *km)
1826 {
1827 spin_lock_bh(&xfrm_km_lock);
1828 list_del_rcu(&km->list);
1829 spin_unlock_bh(&xfrm_km_lock);
1830 synchronize_rcu();
1831 return 0;
1832 }
1833 EXPORT_SYMBOL(xfrm_unregister_km);
1834
1835 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1836 {
1837 int err = 0;
1838 if (unlikely(afinfo == NULL))
1839 return -EINVAL;
1840 if (unlikely(afinfo->family >= NPROTO))
1841 return -EAFNOSUPPORT;
1842 spin_lock_bh(&xfrm_state_afinfo_lock);
1843 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1844 err = -ENOBUFS;
1845 else
1846 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1847 spin_unlock_bh(&xfrm_state_afinfo_lock);
1848 return err;
1849 }
1850 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1851
1852 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1853 {
1854 int err = 0;
1855 if (unlikely(afinfo == NULL))
1856 return -EINVAL;
1857 if (unlikely(afinfo->family >= NPROTO))
1858 return -EAFNOSUPPORT;
1859 spin_lock_bh(&xfrm_state_afinfo_lock);
1860 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1861 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1862 err = -EINVAL;
1863 else
1864 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1865 }
1866 spin_unlock_bh(&xfrm_state_afinfo_lock);
1867 synchronize_rcu();
1868 return err;
1869 }
1870 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1871
1872 static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1873 {
1874 struct xfrm_state_afinfo *afinfo;
1875 if (unlikely(family >= NPROTO))
1876 return NULL;
1877 rcu_read_lock();
1878 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1879 if (unlikely(!afinfo))
1880 rcu_read_unlock();
1881 return afinfo;
1882 }
1883
1884 static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1885 {
1886 rcu_read_unlock();
1887 }
1888
1889 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1890 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1891 {
1892 if (x->tunnel) {
1893 struct xfrm_state *t = x->tunnel;
1894
1895 if (atomic_read(&t->tunnel_users) == 2)
1896 xfrm_state_delete(t);
1897 atomic_dec(&t->tunnel_users);
1898 xfrm_state_put(t);
1899 x->tunnel = NULL;
1900 }
1901 }
1902 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1903
1904 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1905 {
1906 int res;
1907
1908 spin_lock_bh(&x->lock);
1909 if (x->km.state == XFRM_STATE_VALID &&
1910 x->type && x->type->get_mtu)
1911 res = x->type->get_mtu(x, mtu);
1912 else
1913 res = mtu - x->props.header_len;
1914 spin_unlock_bh(&x->lock);
1915 return res;
1916 }
1917
1918 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
1919 {
1920 struct xfrm_state_afinfo *afinfo;
1921 struct xfrm_mode *inner_mode;
1922 int family = x->props.family;
1923 int err;
1924
1925 err = -EAFNOSUPPORT;
1926 afinfo = xfrm_state_get_afinfo(family);
1927 if (!afinfo)
1928 goto error;
1929
1930 err = 0;
1931 if (afinfo->init_flags)
1932 err = afinfo->init_flags(x);
1933
1934 xfrm_state_put_afinfo(afinfo);
1935
1936 if (err)
1937 goto error;
1938
1939 err = -EPROTONOSUPPORT;
1940
1941 if (x->sel.family != AF_UNSPEC) {
1942 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
1943 if (inner_mode == NULL)
1944 goto error;
1945
1946 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
1947 family != x->sel.family) {
1948 xfrm_put_mode(inner_mode);
1949 goto error;
1950 }
1951
1952 x->inner_mode = inner_mode;
1953 } else {
1954 struct xfrm_mode *inner_mode_iaf;
1955 int iafamily = AF_INET;
1956
1957 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
1958 if (inner_mode == NULL)
1959 goto error;
1960
1961 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
1962 xfrm_put_mode(inner_mode);
1963 goto error;
1964 }
1965 x->inner_mode = inner_mode;
1966
1967 if (x->props.family == AF_INET)
1968 iafamily = AF_INET6;
1969
1970 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
1971 if (inner_mode_iaf) {
1972 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
1973 x->inner_mode_iaf = inner_mode_iaf;
1974 else
1975 xfrm_put_mode(inner_mode_iaf);
1976 }
1977 }
1978
1979 x->type = xfrm_get_type(x->id.proto, family);
1980 if (x->type == NULL)
1981 goto error;
1982
1983 err = x->type->init_state(x);
1984 if (err)
1985 goto error;
1986
1987 x->outer_mode = xfrm_get_mode(x->props.mode, family);
1988 if (x->outer_mode == NULL) {
1989 err = -EPROTONOSUPPORT;
1990 goto error;
1991 }
1992
1993 if (init_replay) {
1994 err = xfrm_init_replay(x);
1995 if (err)
1996 goto error;
1997 }
1998
1999 x->km.state = XFRM_STATE_VALID;
2000
2001 error:
2002 return err;
2003 }
2004
2005 EXPORT_SYMBOL(__xfrm_init_state);
2006
2007 int xfrm_init_state(struct xfrm_state *x)
2008 {
2009 return __xfrm_init_state(x, true);
2010 }
2011
2012 EXPORT_SYMBOL(xfrm_init_state);
2013
2014 int __net_init xfrm_state_init(struct net *net)
2015 {
2016 unsigned int sz;
2017
2018 INIT_LIST_HEAD(&net->xfrm.state_all);
2019
2020 sz = sizeof(struct hlist_head) * 8;
2021
2022 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2023 if (!net->xfrm.state_bydst)
2024 goto out_bydst;
2025 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2026 if (!net->xfrm.state_bysrc)
2027 goto out_bysrc;
2028 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2029 if (!net->xfrm.state_byspi)
2030 goto out_byspi;
2031 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2032
2033 net->xfrm.state_num = 0;
2034 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2035 INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2036 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2037 init_waitqueue_head(&net->xfrm.km_waitq);
2038 return 0;
2039
2040 out_byspi:
2041 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2042 out_bysrc:
2043 xfrm_hash_free(net->xfrm.state_bydst, sz);
2044 out_bydst:
2045 return -ENOMEM;
2046 }
2047
2048 void xfrm_state_fini(struct net *net)
2049 {
2050 struct xfrm_audit audit_info;
2051 unsigned int sz;
2052
2053 flush_work(&net->xfrm.state_hash_work);
2054 audit_info.loginuid = INVALID_UID;
2055 audit_info.sessionid = -1;
2056 audit_info.secid = 0;
2057 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2058 flush_work(&net->xfrm.state_gc_work);
2059
2060 WARN_ON(!list_empty(&net->xfrm.state_all));
2061
2062 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2063 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2064 xfrm_hash_free(net->xfrm.state_byspi, sz);
2065 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2066 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2067 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2068 xfrm_hash_free(net->xfrm.state_bydst, sz);
2069 }
2070
2071 #ifdef CONFIG_AUDITSYSCALL
2072 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2073 struct audit_buffer *audit_buf)
2074 {
2075 struct xfrm_sec_ctx *ctx = x->security;
2076 u32 spi = ntohl(x->id.spi);
2077
2078 if (ctx)
2079 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2080 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2081
2082 switch(x->props.family) {
2083 case AF_INET:
2084 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2085 &x->props.saddr.a4, &x->id.daddr.a4);
2086 break;
2087 case AF_INET6:
2088 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2089 x->props.saddr.a6, x->id.daddr.a6);
2090 break;
2091 }
2092
2093 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2094 }
2095
2096 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2097 struct audit_buffer *audit_buf)
2098 {
2099 const struct iphdr *iph4;
2100 const struct ipv6hdr *iph6;
2101
2102 switch (family) {
2103 case AF_INET:
2104 iph4 = ip_hdr(skb);
2105 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2106 &iph4->saddr, &iph4->daddr);
2107 break;
2108 case AF_INET6:
2109 iph6 = ipv6_hdr(skb);
2110 audit_log_format(audit_buf,
2111 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2112 &iph6->saddr,&iph6->daddr,
2113 iph6->flow_lbl[0] & 0x0f,
2114 iph6->flow_lbl[1],
2115 iph6->flow_lbl[2]);
2116 break;
2117 }
2118 }
2119
2120 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2121 kuid_t auid, u32 sessionid, u32 secid)
2122 {
2123 struct audit_buffer *audit_buf;
2124
2125 audit_buf = xfrm_audit_start("SAD-add");
2126 if (audit_buf == NULL)
2127 return;
2128 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2129 xfrm_audit_helper_sainfo(x, audit_buf);
2130 audit_log_format(audit_buf, " res=%u", result);
2131 audit_log_end(audit_buf);
2132 }
2133 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2134
2135 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2136 kuid_t auid, u32 sessionid, u32 secid)
2137 {
2138 struct audit_buffer *audit_buf;
2139
2140 audit_buf = xfrm_audit_start("SAD-delete");
2141 if (audit_buf == NULL)
2142 return;
2143 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2144 xfrm_audit_helper_sainfo(x, audit_buf);
2145 audit_log_format(audit_buf, " res=%u", result);
2146 audit_log_end(audit_buf);
2147 }
2148 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2149
2150 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2151 struct sk_buff *skb)
2152 {
2153 struct audit_buffer *audit_buf;
2154 u32 spi;
2155
2156 audit_buf = xfrm_audit_start("SA-replay-overflow");
2157 if (audit_buf == NULL)
2158 return;
2159 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2160 /* don't record the sequence number because it's inherent in this kind
2161 * of audit message */
2162 spi = ntohl(x->id.spi);
2163 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2164 audit_log_end(audit_buf);
2165 }
2166 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2167
2168 void xfrm_audit_state_replay(struct xfrm_state *x,
2169 struct sk_buff *skb, __be32 net_seq)
2170 {
2171 struct audit_buffer *audit_buf;
2172 u32 spi;
2173
2174 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2175 if (audit_buf == NULL)
2176 return;
2177 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2178 spi = ntohl(x->id.spi);
2179 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2180 spi, spi, ntohl(net_seq));
2181 audit_log_end(audit_buf);
2182 }
2183 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2184
2185 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2186 {
2187 struct audit_buffer *audit_buf;
2188
2189 audit_buf = xfrm_audit_start("SA-notfound");
2190 if (audit_buf == NULL)
2191 return;
2192 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2193 audit_log_end(audit_buf);
2194 }
2195 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2196
2197 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2198 __be32 net_spi, __be32 net_seq)
2199 {
2200 struct audit_buffer *audit_buf;
2201 u32 spi;
2202
2203 audit_buf = xfrm_audit_start("SA-notfound");
2204 if (audit_buf == NULL)
2205 return;
2206 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2207 spi = ntohl(net_spi);
2208 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2209 spi, spi, ntohl(net_seq));
2210 audit_log_end(audit_buf);
2211 }
2212 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2213
2214 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2215 struct sk_buff *skb, u8 proto)
2216 {
2217 struct audit_buffer *audit_buf;
2218 __be32 net_spi;
2219 __be32 net_seq;
2220
2221 audit_buf = xfrm_audit_start("SA-icv-failure");
2222 if (audit_buf == NULL)
2223 return;
2224 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2225 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2226 u32 spi = ntohl(net_spi);
2227 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2228 spi, spi, ntohl(net_seq));
2229 }
2230 audit_log_end(audit_buf);
2231 }
2232 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2233 #endif /* CONFIG_AUDITSYSCALL */
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