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