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Linux 3.12.28
[linux/fpc-iii.git] / net / xfrm / xfrm_state.c
blobb9c3f9e943a9159d1617feec49c751055ea4dd55
1 /*
2 * xfrm_state.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * YOSHIFUJI Hideaki @USAGI
10 * Split up af-specific functions
11 * Derek Atkins <derek@ihtfp.com>
12 * Add UDP Encapsulation
13 *
14 */
15
16 #include <linux/workqueue.h>
17 #include <net/xfrm.h>
18 #include <linux/pfkeyv2.h>
19 #include <linux/ipsec.h>
20 #include <linux/module.h>
21 #include <linux/cache.h>
22 #include <linux/audit.h>
23 #include <asm/uaccess.h>
24 #include <linux/ktime.h>
25 #include <linux/slab.h>
26 #include <linux/interrupt.h>
27 #include <linux/kernel.h>
28
29 #include "xfrm_hash.h"
30
31 /* Each xfrm_state may be linked to two tables:
32
33 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
34 2. Hash table by (daddr,family,reqid) to find what SAs exist for given
35 destination/tunnel endpoint. (output)
36 */
37
38 static DEFINE_SPINLOCK(xfrm_state_lock);
39
40 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
41
42 static inline unsigned int xfrm_dst_hash(struct net *net,
43 const xfrm_address_t *daddr,
44 const xfrm_address_t *saddr,
45 u32 reqid,
46 unsigned short family)
47 {
48 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
49 }
50
51 static inline unsigned int xfrm_src_hash(struct net *net,
52 const xfrm_address_t *daddr,
53 const xfrm_address_t *saddr,
54 unsigned short family)
55 {
56 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
57 }
58
59 static inline unsigned int
60 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
61 __be32 spi, u8 proto, unsigned short family)
62 {
63 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
64 }
65
66 static void xfrm_hash_transfer(struct hlist_head *list,
67 struct hlist_head *ndsttable,
68 struct hlist_head *nsrctable,
69 struct hlist_head *nspitable,
70 unsigned int nhashmask)
71 {
72 struct hlist_node *tmp;
73 struct xfrm_state *x;
74
75 hlist_for_each_entry_safe(x, tmp, list, bydst) {
76 unsigned int h;
77
78 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
79 x->props.reqid, x->props.family,
80 nhashmask);
81 hlist_add_head(&x->bydst, ndsttable+h);
82
83 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
84 x->props.family,
85 nhashmask);
86 hlist_add_head(&x->bysrc, nsrctable+h);
87
88 if (x->id.spi) {
89 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
90 x->id.proto, x->props.family,
91 nhashmask);
92 hlist_add_head(&x->byspi, nspitable+h);
93 }
94 }
95 }
96
97 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
98 {
99 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
100 }
101
102 static DEFINE_MUTEX(hash_resize_mutex);
103
104 static void xfrm_hash_resize(struct work_struct *work)
105 {
106 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
107 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
108 unsigned long nsize, osize;
109 unsigned int nhashmask, ohashmask;
110 int i;
111
112 mutex_lock(&hash_resize_mutex);
113
114 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
115 ndst = xfrm_hash_alloc(nsize);
116 if (!ndst)
117 goto out_unlock;
118 nsrc = xfrm_hash_alloc(nsize);
119 if (!nsrc) {
120 xfrm_hash_free(ndst, nsize);
121 goto out_unlock;
122 }
123 nspi = xfrm_hash_alloc(nsize);
124 if (!nspi) {
125 xfrm_hash_free(ndst, nsize);
126 xfrm_hash_free(nsrc, nsize);
127 goto out_unlock;
128 }
129
130 spin_lock_bh(&xfrm_state_lock);
131
132 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
133 for (i = net->xfrm.state_hmask; i >= 0; i--)
134 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
135 nhashmask);
136
137 odst = net->xfrm.state_bydst;
138 osrc = net->xfrm.state_bysrc;
139 ospi = net->xfrm.state_byspi;
140 ohashmask = net->xfrm.state_hmask;
141
142 net->xfrm.state_bydst = ndst;
143 net->xfrm.state_bysrc = nsrc;
144 net->xfrm.state_byspi = nspi;
145 net->xfrm.state_hmask = nhashmask;
146
147 spin_unlock_bh(&xfrm_state_lock);
148
149 osize = (ohashmask + 1) * sizeof(struct hlist_head);
150 xfrm_hash_free(odst, osize);
151 xfrm_hash_free(osrc, osize);
152 xfrm_hash_free(ospi, osize);
153
154 out_unlock:
155 mutex_unlock(&hash_resize_mutex);
156 }
157
158 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
159 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
160
161 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
162
163 int __xfrm_state_delete(struct xfrm_state *x);
164
165 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
166 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
167
168 static DEFINE_SPINLOCK(xfrm_type_lock);
169 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
170 {
171 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
172 const struct xfrm_type **typemap;
173 int err = 0;
174
175 if (unlikely(afinfo == NULL))
176 return -EAFNOSUPPORT;
177 typemap = afinfo->type_map;
178 spin_lock_bh(&xfrm_type_lock);
179
180 if (likely(typemap[type->proto] == NULL))
181 typemap[type->proto] = type;
182 else
183 err = -EEXIST;
184 spin_unlock_bh(&xfrm_type_lock);
185 xfrm_state_put_afinfo(afinfo);
186 return err;
187 }
188 EXPORT_SYMBOL(xfrm_register_type);
189
190 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
191 {
192 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
193 const struct xfrm_type **typemap;
194 int err = 0;
195
196 if (unlikely(afinfo == NULL))
197 return -EAFNOSUPPORT;
198 typemap = afinfo->type_map;
199 spin_lock_bh(&xfrm_type_lock);
200
201 if (unlikely(typemap[type->proto] != type))
202 err = -ENOENT;
203 else
204 typemap[type->proto] = NULL;
205 spin_unlock_bh(&xfrm_type_lock);
206 xfrm_state_put_afinfo(afinfo);
207 return err;
208 }
209 EXPORT_SYMBOL(xfrm_unregister_type);
210
211 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
212 {
213 struct xfrm_state_afinfo *afinfo;
214 const struct xfrm_type **typemap;
215 const struct xfrm_type *type;
216 int modload_attempted = 0;
217
218 retry:
219 afinfo = xfrm_state_get_afinfo(family);
220 if (unlikely(afinfo == NULL))
221 return NULL;
222 typemap = afinfo->type_map;
223
224 type = typemap[proto];
225 if (unlikely(type && !try_module_get(type->owner)))
226 type = NULL;
227 if (!type && !modload_attempted) {
228 xfrm_state_put_afinfo(afinfo);
229 request_module("xfrm-type-%d-%d", family, proto);
230 modload_attempted = 1;
231 goto retry;
232 }
233
234 xfrm_state_put_afinfo(afinfo);
235 return type;
236 }
237
238 static void xfrm_put_type(const struct xfrm_type *type)
239 {
240 module_put(type->owner);
241 }
242
243 static DEFINE_SPINLOCK(xfrm_mode_lock);
244 int xfrm_register_mode(struct xfrm_mode *mode, int family)
245 {
246 struct xfrm_state_afinfo *afinfo;
247 struct xfrm_mode **modemap;
248 int err;
249
250 if (unlikely(mode->encap >= XFRM_MODE_MAX))
251 return -EINVAL;
252
253 afinfo = xfrm_state_get_afinfo(family);
254 if (unlikely(afinfo == NULL))
255 return -EAFNOSUPPORT;
256
257 err = -EEXIST;
258 modemap = afinfo->mode_map;
259 spin_lock_bh(&xfrm_mode_lock);
260 if (modemap[mode->encap])
261 goto out;
262
263 err = -ENOENT;
264 if (!try_module_get(afinfo->owner))
265 goto out;
266
267 mode->afinfo = afinfo;
268 modemap[mode->encap] = mode;
269 err = 0;
270
271 out:
272 spin_unlock_bh(&xfrm_mode_lock);
273 xfrm_state_put_afinfo(afinfo);
274 return err;
275 }
276 EXPORT_SYMBOL(xfrm_register_mode);
277
278 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
279 {
280 struct xfrm_state_afinfo *afinfo;
281 struct xfrm_mode **modemap;
282 int err;
283
284 if (unlikely(mode->encap >= XFRM_MODE_MAX))
285 return -EINVAL;
286
287 afinfo = xfrm_state_get_afinfo(family);
288 if (unlikely(afinfo == NULL))
289 return -EAFNOSUPPORT;
290
291 err = -ENOENT;
292 modemap = afinfo->mode_map;
293 spin_lock_bh(&xfrm_mode_lock);
294 if (likely(modemap[mode->encap] == mode)) {
295 modemap[mode->encap] = NULL;
296 module_put(mode->afinfo->owner);
297 err = 0;
298 }
299
300 spin_unlock_bh(&xfrm_mode_lock);
301 xfrm_state_put_afinfo(afinfo);
302 return err;
303 }
304 EXPORT_SYMBOL(xfrm_unregister_mode);
305
306 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
307 {
308 struct xfrm_state_afinfo *afinfo;
309 struct xfrm_mode *mode;
310 int modload_attempted = 0;
311
312 if (unlikely(encap >= XFRM_MODE_MAX))
313 return NULL;
314
315 retry:
316 afinfo = xfrm_state_get_afinfo(family);
317 if (unlikely(afinfo == NULL))
318 return NULL;
319
320 mode = afinfo->mode_map[encap];
321 if (unlikely(mode && !try_module_get(mode->owner)))
322 mode = NULL;
323 if (!mode && !modload_attempted) {
324 xfrm_state_put_afinfo(afinfo);
325 request_module("xfrm-mode-%d-%d", family, encap);
326 modload_attempted = 1;
327 goto retry;
328 }
329
330 xfrm_state_put_afinfo(afinfo);
331 return mode;
332 }
333
334 static void xfrm_put_mode(struct xfrm_mode *mode)
335 {
336 module_put(mode->owner);
337 }
338
339 static void xfrm_state_gc_destroy(struct xfrm_state *x)
340 {
341 tasklet_hrtimer_cancel(&x->mtimer);
342 del_timer_sync(&x->rtimer);
343 kfree(x->aalg);
344 kfree(x->ealg);
345 kfree(x->calg);
346 kfree(x->encap);
347 kfree(x->coaddr);
348 kfree(x->replay_esn);
349 kfree(x->preplay_esn);
350 if (x->inner_mode)
351 xfrm_put_mode(x->inner_mode);
352 if (x->inner_mode_iaf)
353 xfrm_put_mode(x->inner_mode_iaf);
354 if (x->outer_mode)
355 xfrm_put_mode(x->outer_mode);
356 if (x->type) {
357 x->type->destructor(x);
358 xfrm_put_type(x->type);
359 }
360 security_xfrm_state_free(x);
361 kfree(x);
362 }
363
364 static void xfrm_state_gc_task(struct work_struct *work)
365 {
366 struct net *net = container_of(work, struct net, xfrm.state_gc_work);
367 struct xfrm_state *x;
368 struct hlist_node *tmp;
369 struct hlist_head gc_list;
370
371 spin_lock_bh(&xfrm_state_gc_lock);
372 hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
373 spin_unlock_bh(&xfrm_state_gc_lock);
374
375 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
376 xfrm_state_gc_destroy(x);
377
378 wake_up(&net->xfrm.km_waitq);
379 }
380
381 static inline unsigned long make_jiffies(long secs)
382 {
383 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
384 return MAX_SCHEDULE_TIMEOUT-1;
385 else
386 return secs*HZ;
387 }
388
389 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
390 {
391 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
392 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
393 struct net *net = xs_net(x);
394 unsigned long now = get_seconds();
395 long next = LONG_MAX;
396 int warn = 0;
397 int err = 0;
398
399 spin_lock(&x->lock);
400 if (x->km.state == XFRM_STATE_DEAD)
401 goto out;
402 if (x->km.state == XFRM_STATE_EXPIRED)
403 goto expired;
404 if (x->lft.hard_add_expires_seconds) {
405 long tmo = x->lft.hard_add_expires_seconds +
406 x->curlft.add_time - now;
407 if (tmo <= 0) {
408 if (x->xflags & XFRM_SOFT_EXPIRE) {
409 /* enter hard expire without soft expire first?!
410 * setting a new date could trigger this.
411 * workarbound: fix x->curflt.add_time by below:
412 */
413 x->curlft.add_time = now - x->saved_tmo - 1;
414 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
415 } else
416 goto expired;
417 }
418 if (tmo < next)
419 next = tmo;
420 }
421 if (x->lft.hard_use_expires_seconds) {
422 long tmo = x->lft.hard_use_expires_seconds +
423 (x->curlft.use_time ? : now) - now;
424 if (tmo <= 0)
425 goto expired;
426 if (tmo < next)
427 next = tmo;
428 }
429 if (x->km.dying)
430 goto resched;
431 if (x->lft.soft_add_expires_seconds) {
432 long tmo = x->lft.soft_add_expires_seconds +
433 x->curlft.add_time - now;
434 if (tmo <= 0) {
435 warn = 1;
436 x->xflags &= ~XFRM_SOFT_EXPIRE;
437 } else if (tmo < next) {
438 next = tmo;
439 x->xflags |= XFRM_SOFT_EXPIRE;
440 x->saved_tmo = tmo;
441 }
442 }
443 if (x->lft.soft_use_expires_seconds) {
444 long tmo = x->lft.soft_use_expires_seconds +
445 (x->curlft.use_time ? : now) - now;
446 if (tmo <= 0)
447 warn = 1;
448 else if (tmo < next)
449 next = tmo;
450 }
451
452 x->km.dying = warn;
453 if (warn)
454 km_state_expired(x, 0, 0);
455 resched:
456 if (next != LONG_MAX){
457 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
458 }
459
460 goto out;
461
462 expired:
463 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
464 x->km.state = XFRM_STATE_EXPIRED;
465 wake_up(&net->xfrm.km_waitq);
466 next = 2;
467 goto resched;
468 }
469
470 err = __xfrm_state_delete(x);
471 if (!err && x->id.spi)
472 km_state_expired(x, 1, 0);
473
474 xfrm_audit_state_delete(x, err ? 0 : 1,
475 audit_get_loginuid(current),
476 audit_get_sessionid(current), 0);
477
478 out:
479 spin_unlock(&x->lock);
480 return HRTIMER_NORESTART;
481 }
482
483 static void xfrm_replay_timer_handler(unsigned long data);
484
485 struct xfrm_state *xfrm_state_alloc(struct net *net)
486 {
487 struct xfrm_state *x;
488
489 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
490
491 if (x) {
492 write_pnet(&x->xs_net, net);
493 atomic_set(&x->refcnt, 1);
494 atomic_set(&x->tunnel_users, 0);
495 INIT_LIST_HEAD(&x->km.all);
496 INIT_HLIST_NODE(&x->bydst);
497 INIT_HLIST_NODE(&x->bysrc);
498 INIT_HLIST_NODE(&x->byspi);
499 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
500 CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
501 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
502 (unsigned long)x);
503 x->curlft.add_time = get_seconds();
504 x->lft.soft_byte_limit = XFRM_INF;
505 x->lft.soft_packet_limit = XFRM_INF;
506 x->lft.hard_byte_limit = XFRM_INF;
507 x->lft.hard_packet_limit = XFRM_INF;
508 x->replay_maxage = 0;
509 x->replay_maxdiff = 0;
510 x->inner_mode = NULL;
511 x->inner_mode_iaf = NULL;
512 spin_lock_init(&x->lock);
513 }
514 return x;
515 }
516 EXPORT_SYMBOL(xfrm_state_alloc);
517
518 void __xfrm_state_destroy(struct xfrm_state *x)
519 {
520 struct net *net = xs_net(x);
521
522 WARN_ON(x->km.state != XFRM_STATE_DEAD);
523
524 spin_lock_bh(&xfrm_state_gc_lock);
525 hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
526 spin_unlock_bh(&xfrm_state_gc_lock);
527 schedule_work(&net->xfrm.state_gc_work);
528 }
529 EXPORT_SYMBOL(__xfrm_state_destroy);
530
531 int __xfrm_state_delete(struct xfrm_state *x)
532 {
533 struct net *net = xs_net(x);
534 int err = -ESRCH;
535
536 if (x->km.state != XFRM_STATE_DEAD) {
537 x->km.state = XFRM_STATE_DEAD;
538 spin_lock(&xfrm_state_lock);
539 list_del(&x->km.all);
540 hlist_del(&x->bydst);
541 hlist_del(&x->bysrc);
542 if (x->id.spi)
543 hlist_del(&x->byspi);
544 net->xfrm.state_num--;
545 spin_unlock(&xfrm_state_lock);
546
547 /* All xfrm_state objects are created by xfrm_state_alloc.
548 * The xfrm_state_alloc call gives a reference, and that
549 * is what we are dropping here.
550 */
551 xfrm_state_put(x);
552 err = 0;
553 }
554
555 return err;
556 }
557 EXPORT_SYMBOL(__xfrm_state_delete);
558
559 int xfrm_state_delete(struct xfrm_state *x)
560 {
561 int err;
562
563 spin_lock_bh(&x->lock);
564 err = __xfrm_state_delete(x);
565 spin_unlock_bh(&x->lock);
566
567 return err;
568 }
569 EXPORT_SYMBOL(xfrm_state_delete);
570
571 #ifdef CONFIG_SECURITY_NETWORK_XFRM
572 static inline int
573 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
574 {
575 int i, err = 0;
576
577 for (i = 0; i <= net->xfrm.state_hmask; i++) {
578 struct xfrm_state *x;
579
580 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
581 if (xfrm_id_proto_match(x->id.proto, proto) &&
582 (err = security_xfrm_state_delete(x)) != 0) {
583 xfrm_audit_state_delete(x, 0,
584 audit_info->loginuid,
585 audit_info->sessionid,
586 audit_info->secid);
587 return err;
588 }
589 }
590 }
591
592 return err;
593 }
594 #else
595 static inline int
596 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
597 {
598 return 0;
599 }
600 #endif
601
602 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
603 {
604 int i, err = 0, cnt = 0;
605
606 spin_lock_bh(&xfrm_state_lock);
607 err = xfrm_state_flush_secctx_check(net, proto, audit_info);
608 if (err)
609 goto out;
610
611 err = -ESRCH;
612 for (i = 0; i <= net->xfrm.state_hmask; i++) {
613 struct xfrm_state *x;
614 restart:
615 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
616 if (!xfrm_state_kern(x) &&
617 xfrm_id_proto_match(x->id.proto, proto)) {
618 xfrm_state_hold(x);
619 spin_unlock_bh(&xfrm_state_lock);
620
621 err = xfrm_state_delete(x);
622 xfrm_audit_state_delete(x, err ? 0 : 1,
623 audit_info->loginuid,
624 audit_info->sessionid,
625 audit_info->secid);
626 xfrm_state_put(x);
627 if (!err)
628 cnt++;
629
630 spin_lock_bh(&xfrm_state_lock);
631 goto restart;
632 }
633 }
634 }
635 if (cnt)
636 err = 0;
637
638 out:
639 spin_unlock_bh(&xfrm_state_lock);
640 wake_up(&net->xfrm.km_waitq);
641 return err;
642 }
643 EXPORT_SYMBOL(xfrm_state_flush);
644
645 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
646 {
647 spin_lock_bh(&xfrm_state_lock);
648 si->sadcnt = net->xfrm.state_num;
649 si->sadhcnt = net->xfrm.state_hmask;
650 si->sadhmcnt = xfrm_state_hashmax;
651 spin_unlock_bh(&xfrm_state_lock);
652 }
653 EXPORT_SYMBOL(xfrm_sad_getinfo);
654
655 static int
656 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
657 const struct xfrm_tmpl *tmpl,
658 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
659 unsigned short family)
660 {
661 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
662 if (!afinfo)
663 return -1;
664 afinfo->init_tempsel(&x->sel, fl);
665
666 if (family != tmpl->encap_family) {
667 xfrm_state_put_afinfo(afinfo);
668 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
669 if (!afinfo)
670 return -1;
671 }
672 afinfo->init_temprop(x, tmpl, daddr, saddr);
673 xfrm_state_put_afinfo(afinfo);
674 return 0;
675 }
676
677 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
678 const xfrm_address_t *daddr,
679 __be32 spi, u8 proto,
680 unsigned short family)
681 {
682 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
683 struct xfrm_state *x;
684
685 hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) {
686 if (x->props.family != family ||
687 x->id.spi != spi ||
688 x->id.proto != proto ||
689 !xfrm_addr_equal(&x->id.daddr, daddr, family))
690 continue;
691
692 if ((mark & x->mark.m) != x->mark.v)
693 continue;
694 xfrm_state_hold(x);
695 return x;
696 }
697
698 return NULL;
699 }
700
701 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
702 const xfrm_address_t *daddr,
703 const xfrm_address_t *saddr,
704 u8 proto, unsigned short family)
705 {
706 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
707 struct xfrm_state *x;
708
709 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
710 if (x->props.family != family ||
711 x->id.proto != proto ||
712 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
713 !xfrm_addr_equal(&x->props.saddr, saddr, family))
714 continue;
715
716 if ((mark & x->mark.m) != x->mark.v)
717 continue;
718 xfrm_state_hold(x);
719 return x;
720 }
721
722 return NULL;
723 }
724
725 static inline struct xfrm_state *
726 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
727 {
728 struct net *net = xs_net(x);
729 u32 mark = x->mark.v & x->mark.m;
730
731 if (use_spi)
732 return __xfrm_state_lookup(net, mark, &x->id.daddr,
733 x->id.spi, x->id.proto, family);
734 else
735 return __xfrm_state_lookup_byaddr(net, mark,
736 &x->id.daddr,
737 &x->props.saddr,
738 x->id.proto, family);
739 }
740
741 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
742 {
743 if (have_hash_collision &&
744 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
745 net->xfrm.state_num > net->xfrm.state_hmask)
746 schedule_work(&net->xfrm.state_hash_work);
747 }
748
749 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
750 const struct flowi *fl, unsigned short family,
751 struct xfrm_state **best, int *acq_in_progress,
752 int *error)
753 {
754 /* Resolution logic:
755 * 1. There is a valid state with matching selector. Done.
756 * 2. Valid state with inappropriate selector. Skip.
757 *
758 * Entering area of "sysdeps".
759 *
760 * 3. If state is not valid, selector is temporary, it selects
761 * only session which triggered previous resolution. Key
762 * manager will do something to install a state with proper
763 * selector.
764 */
765 if (x->km.state == XFRM_STATE_VALID) {
766 if ((x->sel.family &&
767 !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
768 !security_xfrm_state_pol_flow_match(x, pol, fl))
769 return;
770
771 if (!*best ||
772 (*best)->km.dying > x->km.dying ||
773 ((*best)->km.dying == x->km.dying &&
774 (*best)->curlft.add_time < x->curlft.add_time))
775 *best = x;
776 } else if (x->km.state == XFRM_STATE_ACQ) {
777 *acq_in_progress = 1;
778 } else if (x->km.state == XFRM_STATE_ERROR ||
779 x->km.state == XFRM_STATE_EXPIRED) {
780 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
781 security_xfrm_state_pol_flow_match(x, pol, fl))
782 *error = -ESRCH;
783 }
784 }
785
786 struct xfrm_state *
787 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
788 const struct flowi *fl, struct xfrm_tmpl *tmpl,
789 struct xfrm_policy *pol, int *err,
790 unsigned short family)
791 {
792 static xfrm_address_t saddr_wildcard = { };
793 struct net *net = xp_net(pol);
794 unsigned int h, h_wildcard;
795 struct xfrm_state *x, *x0, *to_put;
796 int acquire_in_progress = 0;
797 int error = 0;
798 struct xfrm_state *best = NULL;
799 u32 mark = pol->mark.v & pol->mark.m;
800 unsigned short encap_family = tmpl->encap_family;
801
802 to_put = NULL;
803
804 spin_lock_bh(&xfrm_state_lock);
805 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
806 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
807 if (x->props.family == encap_family &&
808 x->props.reqid == tmpl->reqid &&
809 (mark & x->mark.m) == x->mark.v &&
810 !(x->props.flags & XFRM_STATE_WILDRECV) &&
811 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
812 tmpl->mode == x->props.mode &&
813 tmpl->id.proto == x->id.proto &&
814 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
815 xfrm_state_look_at(pol, x, fl, encap_family,
816 &best, &acquire_in_progress, &error);
817 }
818 if (best)
819 goto found;
820
821 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
822 hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) {
823 if (x->props.family == encap_family &&
824 x->props.reqid == tmpl->reqid &&
825 (mark & x->mark.m) == x->mark.v &&
826 !(x->props.flags & XFRM_STATE_WILDRECV) &&
827 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
828 tmpl->mode == x->props.mode &&
829 tmpl->id.proto == x->id.proto &&
830 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
831 xfrm_state_look_at(pol, x, fl, encap_family,
832 &best, &acquire_in_progress, &error);
833 }
834
835 found:
836 x = best;
837 if (!x && !error && !acquire_in_progress) {
838 if (tmpl->id.spi &&
839 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
840 tmpl->id.proto, encap_family)) != NULL) {
841 to_put = x0;
842 error = -EEXIST;
843 goto out;
844 }
845 x = xfrm_state_alloc(net);
846 if (x == NULL) {
847 error = -ENOMEM;
848 goto out;
849 }
850 /* Initialize temporary state matching only
851 * to current session. */
852 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
853 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
854
855 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
856 if (error) {
857 x->km.state = XFRM_STATE_DEAD;
858 to_put = x;
859 x = NULL;
860 goto out;
861 }
862
863 if (km_query(x, tmpl, pol) == 0) {
864 x->km.state = XFRM_STATE_ACQ;
865 list_add(&x->km.all, &net->xfrm.state_all);
866 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
867 h = xfrm_src_hash(net, daddr, saddr, encap_family);
868 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
869 if (x->id.spi) {
870 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
871 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
872 }
873 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
874 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
875 net->xfrm.state_num++;
876 xfrm_hash_grow_check(net, x->bydst.next != NULL);
877 } else {
878 x->km.state = XFRM_STATE_DEAD;
879 to_put = x;
880 x = NULL;
881 error = -ESRCH;
882 }
883 }
884 out:
885 if (x)
886 xfrm_state_hold(x);
887 else
888 *err = acquire_in_progress ? -EAGAIN : error;
889 spin_unlock_bh(&xfrm_state_lock);
890 if (to_put)
891 xfrm_state_put(to_put);
892 return x;
893 }
894
895 struct xfrm_state *
896 xfrm_stateonly_find(struct net *net, u32 mark,
897 xfrm_address_t *daddr, xfrm_address_t *saddr,
898 unsigned short family, u8 mode, u8 proto, u32 reqid)
899 {
900 unsigned int h;
901 struct xfrm_state *rx = NULL, *x = NULL;
902
903 spin_lock(&xfrm_state_lock);
904 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
905 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
906 if (x->props.family == family &&
907 x->props.reqid == reqid &&
908 (mark & x->mark.m) == x->mark.v &&
909 !(x->props.flags & XFRM_STATE_WILDRECV) &&
910 xfrm_state_addr_check(x, daddr, saddr, family) &&
911 mode == x->props.mode &&
912 proto == x->id.proto &&
913 x->km.state == XFRM_STATE_VALID) {
914 rx = x;
915 break;
916 }
917 }
918
919 if (rx)
920 xfrm_state_hold(rx);
921 spin_unlock(&xfrm_state_lock);
922
923
924 return rx;
925 }
926 EXPORT_SYMBOL(xfrm_stateonly_find);
927
928 static void __xfrm_state_insert(struct xfrm_state *x)
929 {
930 struct net *net = xs_net(x);
931 unsigned int h;
932
933 list_add(&x->km.all, &net->xfrm.state_all);
934
935 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
936 x->props.reqid, x->props.family);
937 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
938
939 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
940 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
941
942 if (x->id.spi) {
943 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
944 x->props.family);
945
946 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
947 }
948
949 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
950 if (x->replay_maxage)
951 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
952
953 wake_up(&net->xfrm.km_waitq);
954
955 net->xfrm.state_num++;
956
957 xfrm_hash_grow_check(net, x->bydst.next != NULL);
958 }
959
960 /* xfrm_state_lock is held */
961 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
962 {
963 struct net *net = xs_net(xnew);
964 unsigned short family = xnew->props.family;
965 u32 reqid = xnew->props.reqid;
966 struct xfrm_state *x;
967 unsigned int h;
968 u32 mark = xnew->mark.v & xnew->mark.m;
969
970 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
971 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
972 if (x->props.family == family &&
973 x->props.reqid == reqid &&
974 (mark & x->mark.m) == x->mark.v &&
975 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
976 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
977 x->genid++;
978 }
979 }
980
981 void xfrm_state_insert(struct xfrm_state *x)
982 {
983 spin_lock_bh(&xfrm_state_lock);
984 __xfrm_state_bump_genids(x);
985 __xfrm_state_insert(x);
986 spin_unlock_bh(&xfrm_state_lock);
987 }
988 EXPORT_SYMBOL(xfrm_state_insert);
989
990 /* xfrm_state_lock is held */
991 static struct xfrm_state *__find_acq_core(struct net *net,
992 const struct xfrm_mark *m,
993 unsigned short family, u8 mode,
994 u32 reqid, u8 proto,
995 const xfrm_address_t *daddr,
996 const xfrm_address_t *saddr,
997 int create)
998 {
999 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1000 struct xfrm_state *x;
1001 u32 mark = m->v & m->m;
1002
1003 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1004 if (x->props.reqid != reqid ||
1005 x->props.mode != mode ||
1006 x->props.family != family ||
1007 x->km.state != XFRM_STATE_ACQ ||
1008 x->id.spi != 0 ||
1009 x->id.proto != proto ||
1010 (mark & x->mark.m) != x->mark.v ||
1011 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1012 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1013 continue;
1014
1015 xfrm_state_hold(x);
1016 return x;
1017 }
1018
1019 if (!create)
1020 return NULL;
1021
1022 x = xfrm_state_alloc(net);
1023 if (likely(x)) {
1024 switch (family) {
1025 case AF_INET:
1026 x->sel.daddr.a4 = daddr->a4;
1027 x->sel.saddr.a4 = saddr->a4;
1028 x->sel.prefixlen_d = 32;
1029 x->sel.prefixlen_s = 32;
1030 x->props.saddr.a4 = saddr->a4;
1031 x->id.daddr.a4 = daddr->a4;
1032 break;
1033
1034 case AF_INET6:
1035 *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr;
1036 *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr;
1037 x->sel.prefixlen_d = 128;
1038 x->sel.prefixlen_s = 128;
1039 *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr;
1040 *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr;
1041 break;
1042 }
1043
1044 x->km.state = XFRM_STATE_ACQ;
1045 x->id.proto = proto;
1046 x->props.family = family;
1047 x->props.mode = mode;
1048 x->props.reqid = reqid;
1049 x->mark.v = m->v;
1050 x->mark.m = m->m;
1051 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1052 xfrm_state_hold(x);
1053 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1054 list_add(&x->km.all, &net->xfrm.state_all);
1055 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1056 h = xfrm_src_hash(net, daddr, saddr, family);
1057 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1058
1059 net->xfrm.state_num++;
1060
1061 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1062 }
1063
1064 return x;
1065 }
1066
1067 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1068
1069 int xfrm_state_add(struct xfrm_state *x)
1070 {
1071 struct net *net = xs_net(x);
1072 struct xfrm_state *x1, *to_put;
1073 int family;
1074 int err;
1075 u32 mark = x->mark.v & x->mark.m;
1076 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1077
1078 family = x->props.family;
1079
1080 to_put = NULL;
1081
1082 spin_lock_bh(&xfrm_state_lock);
1083
1084 x1 = __xfrm_state_locate(x, use_spi, family);
1085 if (x1) {
1086 to_put = x1;
1087 x1 = NULL;
1088 err = -EEXIST;
1089 goto out;
1090 }
1091
1092 if (use_spi && x->km.seq) {
1093 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1094 if (x1 && ((x1->id.proto != x->id.proto) ||
1095 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1096 to_put = x1;
1097 x1 = NULL;
1098 }
1099 }
1100
1101 if (use_spi && !x1)
1102 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1103 x->props.reqid, x->id.proto,
1104 &x->id.daddr, &x->props.saddr, 0);
1105
1106 __xfrm_state_bump_genids(x);
1107 __xfrm_state_insert(x);
1108 err = 0;
1109
1110 out:
1111 spin_unlock_bh(&xfrm_state_lock);
1112
1113 if (x1) {
1114 xfrm_state_delete(x1);
1115 xfrm_state_put(x1);
1116 }
1117
1118 if (to_put)
1119 xfrm_state_put(to_put);
1120
1121 return err;
1122 }
1123 EXPORT_SYMBOL(xfrm_state_add);
1124
1125 #ifdef CONFIG_XFRM_MIGRATE
1126 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1127 {
1128 struct net *net = xs_net(orig);
1129 int err = -ENOMEM;
1130 struct xfrm_state *x = xfrm_state_alloc(net);
1131 if (!x)
1132 goto out;
1133
1134 memcpy(&x->id, &orig->id, sizeof(x->id));
1135 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1136 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1137 x->props.mode = orig->props.mode;
1138 x->props.replay_window = orig->props.replay_window;
1139 x->props.reqid = orig->props.reqid;
1140 x->props.family = orig->props.family;
1141 x->props.saddr = orig->props.saddr;
1142
1143 if (orig->aalg) {
1144 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1145 if (!x->aalg)
1146 goto error;
1147 }
1148 x->props.aalgo = orig->props.aalgo;
1149
1150 if (orig->ealg) {
1151 x->ealg = xfrm_algo_clone(orig->ealg);
1152 if (!x->ealg)
1153 goto error;
1154 }
1155 x->props.ealgo = orig->props.ealgo;
1156
1157 if (orig->calg) {
1158 x->calg = xfrm_algo_clone(orig->calg);
1159 if (!x->calg)
1160 goto error;
1161 }
1162 x->props.calgo = orig->props.calgo;
1163
1164 if (orig->encap) {
1165 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1166 if (!x->encap)
1167 goto error;
1168 }
1169
1170 if (orig->coaddr) {
1171 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1172 GFP_KERNEL);
1173 if (!x->coaddr)
1174 goto error;
1175 }
1176
1177 if (orig->replay_esn) {
1178 err = xfrm_replay_clone(x, orig);
1179 if (err)
1180 goto error;
1181 }
1182
1183 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1184
1185 err = xfrm_init_state(x);
1186 if (err)
1187 goto error;
1188
1189 x->props.flags = orig->props.flags;
1190 x->props.extra_flags = orig->props.extra_flags;
1191
1192 x->curlft.add_time = orig->curlft.add_time;
1193 x->km.state = orig->km.state;
1194 x->km.seq = orig->km.seq;
1195
1196 return x;
1197
1198 error:
1199 xfrm_state_put(x);
1200 out:
1201 if (errp)
1202 *errp = err;
1203 return NULL;
1204 }
1205
1206 /* xfrm_state_lock is held */
1207 struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m)
1208 {
1209 unsigned int h;
1210 struct xfrm_state *x;
1211
1212 if (m->reqid) {
1213 h = xfrm_dst_hash(&init_net, &m->old_daddr, &m->old_saddr,
1214 m->reqid, m->old_family);
1215 hlist_for_each_entry(x, init_net.xfrm.state_bydst+h, bydst) {
1216 if (x->props.mode != m->mode ||
1217 x->id.proto != m->proto)
1218 continue;
1219 if (m->reqid && x->props.reqid != m->reqid)
1220 continue;
1221 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1222 m->old_family) ||
1223 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1224 m->old_family))
1225 continue;
1226 xfrm_state_hold(x);
1227 return x;
1228 }
1229 } else {
1230 h = xfrm_src_hash(&init_net, &m->old_daddr, &m->old_saddr,
1231 m->old_family);
1232 hlist_for_each_entry(x, init_net.xfrm.state_bysrc+h, bysrc) {
1233 if (x->props.mode != m->mode ||
1234 x->id.proto != m->proto)
1235 continue;
1236 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1237 m->old_family) ||
1238 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1239 m->old_family))
1240 continue;
1241 xfrm_state_hold(x);
1242 return x;
1243 }
1244 }
1245
1246 return NULL;
1247 }
1248 EXPORT_SYMBOL(xfrm_migrate_state_find);
1249
1250 struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1251 struct xfrm_migrate *m)
1252 {
1253 struct xfrm_state *xc;
1254 int err;
1255
1256 xc = xfrm_state_clone(x, &err);
1257 if (!xc)
1258 return NULL;
1259
1260 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1261 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1262
1263 /* add state */
1264 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1265 /* a care is needed when the destination address of the
1266 state is to be updated as it is a part of triplet */
1267 xfrm_state_insert(xc);
1268 } else {
1269 if ((err = xfrm_state_add(xc)) < 0)
1270 goto error;
1271 }
1272
1273 return xc;
1274 error:
1275 xfrm_state_put(xc);
1276 return NULL;
1277 }
1278 EXPORT_SYMBOL(xfrm_state_migrate);
1279 #endif
1280
1281 int xfrm_state_update(struct xfrm_state *x)
1282 {
1283 struct xfrm_state *x1, *to_put;
1284 int err;
1285 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1286
1287 to_put = NULL;
1288
1289 spin_lock_bh(&xfrm_state_lock);
1290 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1291
1292 err = -ESRCH;
1293 if (!x1)
1294 goto out;
1295
1296 if (xfrm_state_kern(x1)) {
1297 to_put = x1;
1298 err = -EEXIST;
1299 goto out;
1300 }
1301
1302 if (x1->km.state == XFRM_STATE_ACQ) {
1303 __xfrm_state_insert(x);
1304 x = NULL;
1305 }
1306 err = 0;
1307
1308 out:
1309 spin_unlock_bh(&xfrm_state_lock);
1310
1311 if (to_put)
1312 xfrm_state_put(to_put);
1313
1314 if (err)
1315 return err;
1316
1317 if (!x) {
1318 xfrm_state_delete(x1);
1319 xfrm_state_put(x1);
1320 return 0;
1321 }
1322
1323 err = -EINVAL;
1324 spin_lock_bh(&x1->lock);
1325 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1326 if (x->encap && x1->encap)
1327 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1328 if (x->coaddr && x1->coaddr) {
1329 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1330 }
1331 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1332 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1333 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1334 x1->km.dying = 0;
1335
1336 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1337 if (x1->curlft.use_time)
1338 xfrm_state_check_expire(x1);
1339
1340 err = 0;
1341 x->km.state = XFRM_STATE_DEAD;
1342 __xfrm_state_put(x);
1343 }
1344 spin_unlock_bh(&x1->lock);
1345
1346 xfrm_state_put(x1);
1347
1348 return err;
1349 }
1350 EXPORT_SYMBOL(xfrm_state_update);
1351
1352 int xfrm_state_check_expire(struct xfrm_state *x)
1353 {
1354 if (!x->curlft.use_time)
1355 x->curlft.use_time = get_seconds();
1356
1357 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1358 x->curlft.packets >= x->lft.hard_packet_limit) {
1359 x->km.state = XFRM_STATE_EXPIRED;
1360 tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
1361 return -EINVAL;
1362 }
1363
1364 if (!x->km.dying &&
1365 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1366 x->curlft.packets >= x->lft.soft_packet_limit)) {
1367 x->km.dying = 1;
1368 km_state_expired(x, 0, 0);
1369 }
1370 return 0;
1371 }
1372 EXPORT_SYMBOL(xfrm_state_check_expire);
1373
1374 struct xfrm_state *
1375 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1376 u8 proto, unsigned short family)
1377 {
1378 struct xfrm_state *x;
1379
1380 spin_lock_bh(&xfrm_state_lock);
1381 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1382 spin_unlock_bh(&xfrm_state_lock);
1383 return x;
1384 }
1385 EXPORT_SYMBOL(xfrm_state_lookup);
1386
1387 struct xfrm_state *
1388 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1389 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1390 u8 proto, unsigned short family)
1391 {
1392 struct xfrm_state *x;
1393
1394 spin_lock_bh(&xfrm_state_lock);
1395 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1396 spin_unlock_bh(&xfrm_state_lock);
1397 return x;
1398 }
1399 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1400
1401 struct xfrm_state *
1402 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1403 u8 proto, const xfrm_address_t *daddr,
1404 const xfrm_address_t *saddr, int create, unsigned short family)
1405 {
1406 struct xfrm_state *x;
1407
1408 spin_lock_bh(&xfrm_state_lock);
1409 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1410 spin_unlock_bh(&xfrm_state_lock);
1411
1412 return x;
1413 }
1414 EXPORT_SYMBOL(xfrm_find_acq);
1415
1416 #ifdef CONFIG_XFRM_SUB_POLICY
1417 int
1418 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1419 unsigned short family)
1420 {
1421 int err = 0;
1422 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1423 if (!afinfo)
1424 return -EAFNOSUPPORT;
1425
1426 spin_lock_bh(&xfrm_state_lock);
1427 if (afinfo->tmpl_sort)
1428 err = afinfo->tmpl_sort(dst, src, n);
1429 spin_unlock_bh(&xfrm_state_lock);
1430 xfrm_state_put_afinfo(afinfo);
1431 return err;
1432 }
1433 EXPORT_SYMBOL(xfrm_tmpl_sort);
1434
1435 int
1436 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1437 unsigned short family)
1438 {
1439 int err = 0;
1440 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1441 if (!afinfo)
1442 return -EAFNOSUPPORT;
1443
1444 spin_lock_bh(&xfrm_state_lock);
1445 if (afinfo->state_sort)
1446 err = afinfo->state_sort(dst, src, n);
1447 spin_unlock_bh(&xfrm_state_lock);
1448 xfrm_state_put_afinfo(afinfo);
1449 return err;
1450 }
1451 EXPORT_SYMBOL(xfrm_state_sort);
1452 #endif
1453
1454 /* Silly enough, but I'm lazy to build resolution list */
1455
1456 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1457 {
1458 int i;
1459
1460 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1461 struct xfrm_state *x;
1462
1463 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1464 if (x->km.seq == seq &&
1465 (mark & x->mark.m) == x->mark.v &&
1466 x->km.state == XFRM_STATE_ACQ) {
1467 xfrm_state_hold(x);
1468 return x;
1469 }
1470 }
1471 }
1472 return NULL;
1473 }
1474
1475 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1476 {
1477 struct xfrm_state *x;
1478
1479 spin_lock_bh(&xfrm_state_lock);
1480 x = __xfrm_find_acq_byseq(net, mark, seq);
1481 spin_unlock_bh(&xfrm_state_lock);
1482 return x;
1483 }
1484 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1485
1486 u32 xfrm_get_acqseq(void)
1487 {
1488 u32 res;
1489 static atomic_t acqseq;
1490
1491 do {
1492 res = atomic_inc_return(&acqseq);
1493 } while (!res);
1494
1495 return res;
1496 }
1497 EXPORT_SYMBOL(xfrm_get_acqseq);
1498
1499 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1500 {
1501 struct net *net = xs_net(x);
1502 unsigned int h;
1503 struct xfrm_state *x0;
1504 int err = -ENOENT;
1505 __be32 minspi = htonl(low);
1506 __be32 maxspi = htonl(high);
1507 u32 mark = x->mark.v & x->mark.m;
1508
1509 spin_lock_bh(&x->lock);
1510 if (x->km.state == XFRM_STATE_DEAD)
1511 goto unlock;
1512
1513 err = 0;
1514 if (x->id.spi)
1515 goto unlock;
1516
1517 err = -ENOENT;
1518
1519 if (minspi == maxspi) {
1520 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1521 if (x0) {
1522 xfrm_state_put(x0);
1523 goto unlock;
1524 }
1525 x->id.spi = minspi;
1526 } else {
1527 u32 spi = 0;
1528 for (h=0; h<high-low+1; h++) {
1529 spi = low + net_random()%(high-low+1);
1530 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1531 if (x0 == NULL) {
1532 x->id.spi = htonl(spi);
1533 break;
1534 }
1535 xfrm_state_put(x0);
1536 }
1537 }
1538 if (x->id.spi) {
1539 spin_lock_bh(&xfrm_state_lock);
1540 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1541 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1542 spin_unlock_bh(&xfrm_state_lock);
1543
1544 err = 0;
1545 }
1546
1547 unlock:
1548 spin_unlock_bh(&x->lock);
1549
1550 return err;
1551 }
1552 EXPORT_SYMBOL(xfrm_alloc_spi);
1553
1554 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1555 int (*func)(struct xfrm_state *, int, void*),
1556 void *data)
1557 {
1558 struct xfrm_state *state;
1559 struct xfrm_state_walk *x;
1560 int err = 0;
1561
1562 if (walk->seq != 0 && list_empty(&walk->all))
1563 return 0;
1564
1565 spin_lock_bh(&xfrm_state_lock);
1566 if (list_empty(&walk->all))
1567 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1568 else
1569 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1570 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1571 if (x->state == XFRM_STATE_DEAD)
1572 continue;
1573 state = container_of(x, struct xfrm_state, km);
1574 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1575 continue;
1576 err = func(state, walk->seq, data);
1577 if (err) {
1578 list_move_tail(&walk->all, &x->all);
1579 goto out;
1580 }
1581 walk->seq++;
1582 }
1583 if (walk->seq == 0) {
1584 err = -ENOENT;
1585 goto out;
1586 }
1587 list_del_init(&walk->all);
1588 out:
1589 spin_unlock_bh(&xfrm_state_lock);
1590 return err;
1591 }
1592 EXPORT_SYMBOL(xfrm_state_walk);
1593
1594 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1595 {
1596 INIT_LIST_HEAD(&walk->all);
1597 walk->proto = proto;
1598 walk->state = XFRM_STATE_DEAD;
1599 walk->seq = 0;
1600 }
1601 EXPORT_SYMBOL(xfrm_state_walk_init);
1602
1603 void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1604 {
1605 if (list_empty(&walk->all))
1606 return;
1607
1608 spin_lock_bh(&xfrm_state_lock);
1609 list_del(&walk->all);
1610 spin_unlock_bh(&xfrm_state_lock);
1611 }
1612 EXPORT_SYMBOL(xfrm_state_walk_done);
1613
1614 static void xfrm_replay_timer_handler(unsigned long data)
1615 {
1616 struct xfrm_state *x = (struct xfrm_state*)data;
1617
1618 spin_lock(&x->lock);
1619
1620 if (x->km.state == XFRM_STATE_VALID) {
1621 if (xfrm_aevent_is_on(xs_net(x)))
1622 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1623 else
1624 x->xflags |= XFRM_TIME_DEFER;
1625 }
1626
1627 spin_unlock(&x->lock);
1628 }
1629
1630 static LIST_HEAD(xfrm_km_list);
1631
1632 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1633 {
1634 struct xfrm_mgr *km;
1635
1636 rcu_read_lock();
1637 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1638 if (km->notify_policy)
1639 km->notify_policy(xp, dir, c);
1640 rcu_read_unlock();
1641 }
1642
1643 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1644 {
1645 struct xfrm_mgr *km;
1646 rcu_read_lock();
1647 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1648 if (km->notify)
1649 km->notify(x, c);
1650 rcu_read_unlock();
1651 }
1652
1653 EXPORT_SYMBOL(km_policy_notify);
1654 EXPORT_SYMBOL(km_state_notify);
1655
1656 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1657 {
1658 struct net *net = xs_net(x);
1659 struct km_event c;
1660
1661 c.data.hard = hard;
1662 c.portid = portid;
1663 c.event = XFRM_MSG_EXPIRE;
1664 km_state_notify(x, &c);
1665
1666 if (hard)
1667 wake_up(&net->xfrm.km_waitq);
1668 }
1669
1670 EXPORT_SYMBOL(km_state_expired);
1671 /*
1672 * We send to all registered managers regardless of failure
1673 * We are happy with one success
1674 */
1675 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1676 {
1677 int err = -EINVAL, acqret;
1678 struct xfrm_mgr *km;
1679
1680 rcu_read_lock();
1681 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1682 acqret = km->acquire(x, t, pol);
1683 if (!acqret)
1684 err = acqret;
1685 }
1686 rcu_read_unlock();
1687 return err;
1688 }
1689 EXPORT_SYMBOL(km_query);
1690
1691 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1692 {
1693 int err = -EINVAL;
1694 struct xfrm_mgr *km;
1695
1696 rcu_read_lock();
1697 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1698 if (km->new_mapping)
1699 err = km->new_mapping(x, ipaddr, sport);
1700 if (!err)
1701 break;
1702 }
1703 rcu_read_unlock();
1704 return err;
1705 }
1706 EXPORT_SYMBOL(km_new_mapping);
1707
1708 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1709 {
1710 struct net *net = xp_net(pol);
1711 struct km_event c;
1712
1713 c.data.hard = hard;
1714 c.portid = portid;
1715 c.event = XFRM_MSG_POLEXPIRE;
1716 km_policy_notify(pol, dir, &c);
1717
1718 if (hard)
1719 wake_up(&net->xfrm.km_waitq);
1720 }
1721 EXPORT_SYMBOL(km_policy_expired);
1722
1723 #ifdef CONFIG_XFRM_MIGRATE
1724 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1725 const struct xfrm_migrate *m, int num_migrate,
1726 const struct xfrm_kmaddress *k)
1727 {
1728 int err = -EINVAL;
1729 int ret;
1730 struct xfrm_mgr *km;
1731
1732 rcu_read_lock();
1733 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1734 if (km->migrate) {
1735 ret = km->migrate(sel, dir, type, m, num_migrate, k);
1736 if (!ret)
1737 err = ret;
1738 }
1739 }
1740 rcu_read_unlock();
1741 return err;
1742 }
1743 EXPORT_SYMBOL(km_migrate);
1744 #endif
1745
1746 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1747 {
1748 int err = -EINVAL;
1749 int ret;
1750 struct xfrm_mgr *km;
1751
1752 rcu_read_lock();
1753 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1754 if (km->report) {
1755 ret = km->report(net, proto, sel, addr);
1756 if (!ret)
1757 err = ret;
1758 }
1759 }
1760 rcu_read_unlock();
1761 return err;
1762 }
1763 EXPORT_SYMBOL(km_report);
1764
1765 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1766 {
1767 int err;
1768 u8 *data;
1769 struct xfrm_mgr *km;
1770 struct xfrm_policy *pol = NULL;
1771
1772 if (optlen <= 0 || optlen > PAGE_SIZE)
1773 return -EMSGSIZE;
1774
1775 data = kmalloc(optlen, GFP_KERNEL);
1776 if (!data)
1777 return -ENOMEM;
1778
1779 err = -EFAULT;
1780 if (copy_from_user(data, optval, optlen))
1781 goto out;
1782
1783 err = -EINVAL;
1784 rcu_read_lock();
1785 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1786 pol = km->compile_policy(sk, optname, data,
1787 optlen, &err);
1788 if (err >= 0)
1789 break;
1790 }
1791 rcu_read_unlock();
1792
1793 if (err >= 0) {
1794 xfrm_sk_policy_insert(sk, err, pol);
1795 xfrm_pol_put(pol);
1796 err = 0;
1797 }
1798
1799 out:
1800 kfree(data);
1801 return err;
1802 }
1803 EXPORT_SYMBOL(xfrm_user_policy);
1804
1805 static DEFINE_SPINLOCK(xfrm_km_lock);
1806
1807 int xfrm_register_km(struct xfrm_mgr *km)
1808 {
1809 spin_lock_bh(&xfrm_km_lock);
1810 list_add_tail_rcu(&km->list, &xfrm_km_list);
1811 spin_unlock_bh(&xfrm_km_lock);
1812 return 0;
1813 }
1814 EXPORT_SYMBOL(xfrm_register_km);
1815
1816 int xfrm_unregister_km(struct xfrm_mgr *km)
1817 {
1818 spin_lock_bh(&xfrm_km_lock);
1819 list_del_rcu(&km->list);
1820 spin_unlock_bh(&xfrm_km_lock);
1821 synchronize_rcu();
1822 return 0;
1823 }
1824 EXPORT_SYMBOL(xfrm_unregister_km);
1825
1826 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1827 {
1828 int err = 0;
1829 if (unlikely(afinfo == NULL))
1830 return -EINVAL;
1831 if (unlikely(afinfo->family >= NPROTO))
1832 return -EAFNOSUPPORT;
1833 spin_lock_bh(&xfrm_state_afinfo_lock);
1834 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1835 err = -ENOBUFS;
1836 else
1837 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1838 spin_unlock_bh(&xfrm_state_afinfo_lock);
1839 return err;
1840 }
1841 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1842
1843 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1844 {
1845 int err = 0;
1846 if (unlikely(afinfo == NULL))
1847 return -EINVAL;
1848 if (unlikely(afinfo->family >= NPROTO))
1849 return -EAFNOSUPPORT;
1850 spin_lock_bh(&xfrm_state_afinfo_lock);
1851 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1852 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1853 err = -EINVAL;
1854 else
1855 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1856 }
1857 spin_unlock_bh(&xfrm_state_afinfo_lock);
1858 synchronize_rcu();
1859 return err;
1860 }
1861 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1862
1863 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1864 {
1865 struct xfrm_state_afinfo *afinfo;
1866 if (unlikely(family >= NPROTO))
1867 return NULL;
1868 rcu_read_lock();
1869 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1870 if (unlikely(!afinfo))
1871 rcu_read_unlock();
1872 return afinfo;
1873 }
1874
1875 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1876 {
1877 rcu_read_unlock();
1878 }
1879
1880 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1881 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1882 {
1883 if (x->tunnel) {
1884 struct xfrm_state *t = x->tunnel;
1885
1886 if (atomic_read(&t->tunnel_users) == 2)
1887 xfrm_state_delete(t);
1888 atomic_dec(&t->tunnel_users);
1889 xfrm_state_put(t);
1890 x->tunnel = NULL;
1891 }
1892 }
1893 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1894
1895 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1896 {
1897 int res;
1898
1899 spin_lock_bh(&x->lock);
1900 if (x->km.state == XFRM_STATE_VALID &&
1901 x->type && x->type->get_mtu)
1902 res = x->type->get_mtu(x, mtu);
1903 else
1904 res = mtu - x->props.header_len;
1905 spin_unlock_bh(&x->lock);
1906 return res;
1907 }
1908
1909 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
1910 {
1911 struct xfrm_state_afinfo *afinfo;
1912 struct xfrm_mode *inner_mode;
1913 int family = x->props.family;
1914 int err;
1915
1916 err = -EAFNOSUPPORT;
1917 afinfo = xfrm_state_get_afinfo(family);
1918 if (!afinfo)
1919 goto error;
1920
1921 err = 0;
1922 if (afinfo->init_flags)
1923 err = afinfo->init_flags(x);
1924
1925 xfrm_state_put_afinfo(afinfo);
1926
1927 if (err)
1928 goto error;
1929
1930 err = -EPROTONOSUPPORT;
1931
1932 if (x->sel.family != AF_UNSPEC) {
1933 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
1934 if (inner_mode == NULL)
1935 goto error;
1936
1937 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
1938 family != x->sel.family) {
1939 xfrm_put_mode(inner_mode);
1940 goto error;
1941 }
1942
1943 x->inner_mode = inner_mode;
1944 } else {
1945 struct xfrm_mode *inner_mode_iaf;
1946 int iafamily = AF_INET;
1947
1948 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
1949 if (inner_mode == NULL)
1950 goto error;
1951
1952 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
1953 xfrm_put_mode(inner_mode);
1954 goto error;
1955 }
1956 x->inner_mode = inner_mode;
1957
1958 if (x->props.family == AF_INET)
1959 iafamily = AF_INET6;
1960
1961 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
1962 if (inner_mode_iaf) {
1963 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
1964 x->inner_mode_iaf = inner_mode_iaf;
1965 else
1966 xfrm_put_mode(inner_mode_iaf);
1967 }
1968 }
1969
1970 x->type = xfrm_get_type(x->id.proto, family);
1971 if (x->type == NULL)
1972 goto error;
1973
1974 err = x->type->init_state(x);
1975 if (err)
1976 goto error;
1977
1978 x->outer_mode = xfrm_get_mode(x->props.mode, family);
1979 if (x->outer_mode == NULL) {
1980 err = -EPROTONOSUPPORT;
1981 goto error;
1982 }
1983
1984 if (init_replay) {
1985 err = xfrm_init_replay(x);
1986 if (err)
1987 goto error;
1988 }
1989
1990 x->km.state = XFRM_STATE_VALID;
1991
1992 error:
1993 return err;
1994 }
1995
1996 EXPORT_SYMBOL(__xfrm_init_state);
1997
1998 int xfrm_init_state(struct xfrm_state *x)
1999 {
2000 return __xfrm_init_state(x, true);
2001 }
2002
2003 EXPORT_SYMBOL(xfrm_init_state);
2004
2005 int __net_init xfrm_state_init(struct net *net)
2006 {
2007 unsigned int sz;
2008
2009 INIT_LIST_HEAD(&net->xfrm.state_all);
2010
2011 sz = sizeof(struct hlist_head) * 8;
2012
2013 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2014 if (!net->xfrm.state_bydst)
2015 goto out_bydst;
2016 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2017 if (!net->xfrm.state_bysrc)
2018 goto out_bysrc;
2019 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2020 if (!net->xfrm.state_byspi)
2021 goto out_byspi;
2022 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2023
2024 net->xfrm.state_num = 0;
2025 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2026 INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2027 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2028 init_waitqueue_head(&net->xfrm.km_waitq);
2029 return 0;
2030
2031 out_byspi:
2032 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2033 out_bysrc:
2034 xfrm_hash_free(net->xfrm.state_bydst, sz);
2035 out_bydst:
2036 return -ENOMEM;
2037 }
2038
2039 void xfrm_state_fini(struct net *net)
2040 {
2041 struct xfrm_audit audit_info;
2042 unsigned int sz;
2043
2044 flush_work(&net->xfrm.state_hash_work);
2045 audit_info.loginuid = INVALID_UID;
2046 audit_info.sessionid = -1;
2047 audit_info.secid = 0;
2048 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2049 flush_work(&net->xfrm.state_gc_work);
2050
2051 WARN_ON(!list_empty(&net->xfrm.state_all));
2052
2053 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2054 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2055 xfrm_hash_free(net->xfrm.state_byspi, sz);
2056 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2057 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2058 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2059 xfrm_hash_free(net->xfrm.state_bydst, sz);
2060 }
2061
2062 #ifdef CONFIG_AUDITSYSCALL
2063 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2064 struct audit_buffer *audit_buf)
2065 {
2066 struct xfrm_sec_ctx *ctx = x->security;
2067 u32 spi = ntohl(x->id.spi);
2068
2069 if (ctx)
2070 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2071 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2072
2073 switch(x->props.family) {
2074 case AF_INET:
2075 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2076 &x->props.saddr.a4, &x->id.daddr.a4);
2077 break;
2078 case AF_INET6:
2079 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2080 x->props.saddr.a6, x->id.daddr.a6);
2081 break;
2082 }
2083
2084 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2085 }
2086
2087 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2088 struct audit_buffer *audit_buf)
2089 {
2090 const struct iphdr *iph4;
2091 const struct ipv6hdr *iph6;
2092
2093 switch (family) {
2094 case AF_INET:
2095 iph4 = ip_hdr(skb);
2096 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2097 &iph4->saddr, &iph4->daddr);
2098 break;
2099 case AF_INET6:
2100 iph6 = ipv6_hdr(skb);
2101 audit_log_format(audit_buf,
2102 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2103 &iph6->saddr,&iph6->daddr,
2104 iph6->flow_lbl[0] & 0x0f,
2105 iph6->flow_lbl[1],
2106 iph6->flow_lbl[2]);
2107 break;
2108 }
2109 }
2110
2111 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2112 kuid_t auid, u32 sessionid, u32 secid)
2113 {
2114 struct audit_buffer *audit_buf;
2115
2116 audit_buf = xfrm_audit_start("SAD-add");
2117 if (audit_buf == NULL)
2118 return;
2119 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2120 xfrm_audit_helper_sainfo(x, audit_buf);
2121 audit_log_format(audit_buf, " res=%u", result);
2122 audit_log_end(audit_buf);
2123 }
2124 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2125
2126 void xfrm_audit_state_delete(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-delete");
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_delete);
2140
2141 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2142 struct sk_buff *skb)
2143 {
2144 struct audit_buffer *audit_buf;
2145 u32 spi;
2146
2147 audit_buf = xfrm_audit_start("SA-replay-overflow");
2148 if (audit_buf == NULL)
2149 return;
2150 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2151 /* don't record the sequence number because it's inherent in this kind
2152 * of audit message */
2153 spi = ntohl(x->id.spi);
2154 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2155 audit_log_end(audit_buf);
2156 }
2157 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2158
2159 void xfrm_audit_state_replay(struct xfrm_state *x,
2160 struct sk_buff *skb, __be32 net_seq)
2161 {
2162 struct audit_buffer *audit_buf;
2163 u32 spi;
2164
2165 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2166 if (audit_buf == NULL)
2167 return;
2168 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2169 spi = ntohl(x->id.spi);
2170 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2171 spi, spi, ntohl(net_seq));
2172 audit_log_end(audit_buf);
2173 }
2174 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2175
2176 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2177 {
2178 struct audit_buffer *audit_buf;
2179
2180 audit_buf = xfrm_audit_start("SA-notfound");
2181 if (audit_buf == NULL)
2182 return;
2183 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2184 audit_log_end(audit_buf);
2185 }
2186 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2187
2188 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2189 __be32 net_spi, __be32 net_seq)
2190 {
2191 struct audit_buffer *audit_buf;
2192 u32 spi;
2193
2194 audit_buf = xfrm_audit_start("SA-notfound");
2195 if (audit_buf == NULL)
2196 return;
2197 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2198 spi = ntohl(net_spi);
2199 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2200 spi, spi, ntohl(net_seq));
2201 audit_log_end(audit_buf);
2202 }
2203 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2204
2205 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2206 struct sk_buff *skb, u8 proto)
2207 {
2208 struct audit_buffer *audit_buf;
2209 __be32 net_spi;
2210 __be32 net_seq;
2211
2212 audit_buf = xfrm_audit_start("SA-icv-failure");
2213 if (audit_buf == NULL)
2214 return;
2215 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2216 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2217 u32 spi = ntohl(net_spi);
2218 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2219 spi, spi, ntohl(net_seq));
2220 }
2221 audit_log_end(audit_buf);
2222 }
2223 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2224 #endif /* CONFIG_AUDITSYSCALL */
Linux with added FPC-III support