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xfrm: Fix NULL pointer dereference on sub policy usage
[deliverable/linux.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 unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
39
40 static inline unsigned int xfrm_dst_hash(struct net *net,
41 const xfrm_address_t *daddr,
42 const xfrm_address_t *saddr,
43 u32 reqid,
44 unsigned short family)
45 {
46 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
47 }
48
49 static inline unsigned int xfrm_src_hash(struct net *net,
50 const xfrm_address_t *daddr,
51 const xfrm_address_t *saddr,
52 unsigned short family)
53 {
54 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
55 }
56
57 static inline unsigned int
58 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
59 __be32 spi, u8 proto, unsigned short family)
60 {
61 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
62 }
63
64 static void xfrm_hash_transfer(struct hlist_head *list,
65 struct hlist_head *ndsttable,
66 struct hlist_head *nsrctable,
67 struct hlist_head *nspitable,
68 unsigned int nhashmask)
69 {
70 struct hlist_node *tmp;
71 struct xfrm_state *x;
72
73 hlist_for_each_entry_safe(x, tmp, list, bydst) {
74 unsigned int h;
75
76 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
77 x->props.reqid, x->props.family,
78 nhashmask);
79 hlist_add_head(&x->bydst, ndsttable+h);
80
81 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
82 x->props.family,
83 nhashmask);
84 hlist_add_head(&x->bysrc, nsrctable+h);
85
86 if (x->id.spi) {
87 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
88 x->id.proto, x->props.family,
89 nhashmask);
90 hlist_add_head(&x->byspi, nspitable+h);
91 }
92 }
93 }
94
95 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
96 {
97 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
98 }
99
100 static DEFINE_MUTEX(hash_resize_mutex);
101
102 static void xfrm_hash_resize(struct work_struct *work)
103 {
104 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
105 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
106 unsigned long nsize, osize;
107 unsigned int nhashmask, ohashmask;
108 int i;
109
110 mutex_lock(&hash_resize_mutex);
111
112 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
113 ndst = xfrm_hash_alloc(nsize);
114 if (!ndst)
115 goto out_unlock;
116 nsrc = xfrm_hash_alloc(nsize);
117 if (!nsrc) {
118 xfrm_hash_free(ndst, nsize);
119 goto out_unlock;
120 }
121 nspi = xfrm_hash_alloc(nsize);
122 if (!nspi) {
123 xfrm_hash_free(ndst, nsize);
124 xfrm_hash_free(nsrc, nsize);
125 goto out_unlock;
126 }
127
128 spin_lock_bh(&net->xfrm.xfrm_state_lock);
129
130 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
131 for (i = net->xfrm.state_hmask; i >= 0; i--)
132 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
133 nhashmask);
134
135 odst = net->xfrm.state_bydst;
136 osrc = net->xfrm.state_bysrc;
137 ospi = net->xfrm.state_byspi;
138 ohashmask = net->xfrm.state_hmask;
139
140 net->xfrm.state_bydst = ndst;
141 net->xfrm.state_bysrc = nsrc;
142 net->xfrm.state_byspi = nspi;
143 net->xfrm.state_hmask = nhashmask;
144
145 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
146
147 osize = (ohashmask + 1) * sizeof(struct hlist_head);
148 xfrm_hash_free(odst, osize);
149 xfrm_hash_free(osrc, osize);
150 xfrm_hash_free(ospi, osize);
151
152 out_unlock:
153 mutex_unlock(&hash_resize_mutex);
154 }
155
156 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
157 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
158
159 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
160
161 int __xfrm_state_delete(struct xfrm_state *x);
162
163 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
164 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
165
166 static DEFINE_SPINLOCK(xfrm_type_lock);
167 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
168 {
169 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
170 const struct xfrm_type **typemap;
171 int err = 0;
172
173 if (unlikely(afinfo == NULL))
174 return -EAFNOSUPPORT;
175 typemap = afinfo->type_map;
176 spin_lock_bh(&xfrm_type_lock);
177
178 if (likely(typemap[type->proto] == NULL))
179 typemap[type->proto] = type;
180 else
181 err = -EEXIST;
182 spin_unlock_bh(&xfrm_type_lock);
183 xfrm_state_put_afinfo(afinfo);
184 return err;
185 }
186 EXPORT_SYMBOL(xfrm_register_type);
187
188 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
189 {
190 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
191 const struct xfrm_type **typemap;
192 int err = 0;
193
194 if (unlikely(afinfo == NULL))
195 return -EAFNOSUPPORT;
196 typemap = afinfo->type_map;
197 spin_lock_bh(&xfrm_type_lock);
198
199 if (unlikely(typemap[type->proto] != type))
200 err = -ENOENT;
201 else
202 typemap[type->proto] = NULL;
203 spin_unlock_bh(&xfrm_type_lock);
204 xfrm_state_put_afinfo(afinfo);
205 return err;
206 }
207 EXPORT_SYMBOL(xfrm_unregister_type);
208
209 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
210 {
211 struct xfrm_state_afinfo *afinfo;
212 const struct xfrm_type **typemap;
213 const struct xfrm_type *type;
214 int modload_attempted = 0;
215
216 retry:
217 afinfo = xfrm_state_get_afinfo(family);
218 if (unlikely(afinfo == NULL))
219 return NULL;
220 typemap = afinfo->type_map;
221
222 type = typemap[proto];
223 if (unlikely(type && !try_module_get(type->owner)))
224 type = NULL;
225 if (!type && !modload_attempted) {
226 xfrm_state_put_afinfo(afinfo);
227 request_module("xfrm-type-%d-%d", family, proto);
228 modload_attempted = 1;
229 goto retry;
230 }
231
232 xfrm_state_put_afinfo(afinfo);
233 return type;
234 }
235
236 static void xfrm_put_type(const struct xfrm_type *type)
237 {
238 module_put(type->owner);
239 }
240
241 static DEFINE_SPINLOCK(xfrm_mode_lock);
242 int xfrm_register_mode(struct xfrm_mode *mode, int family)
243 {
244 struct xfrm_state_afinfo *afinfo;
245 struct xfrm_mode **modemap;
246 int err;
247
248 if (unlikely(mode->encap >= XFRM_MODE_MAX))
249 return -EINVAL;
250
251 afinfo = xfrm_state_get_afinfo(family);
252 if (unlikely(afinfo == NULL))
253 return -EAFNOSUPPORT;
254
255 err = -EEXIST;
256 modemap = afinfo->mode_map;
257 spin_lock_bh(&xfrm_mode_lock);
258 if (modemap[mode->encap])
259 goto out;
260
261 err = -ENOENT;
262 if (!try_module_get(afinfo->owner))
263 goto out;
264
265 mode->afinfo = afinfo;
266 modemap[mode->encap] = mode;
267 err = 0;
268
269 out:
270 spin_unlock_bh(&xfrm_mode_lock);
271 xfrm_state_put_afinfo(afinfo);
272 return err;
273 }
274 EXPORT_SYMBOL(xfrm_register_mode);
275
276 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
277 {
278 struct xfrm_state_afinfo *afinfo;
279 struct xfrm_mode **modemap;
280 int err;
281
282 if (unlikely(mode->encap >= XFRM_MODE_MAX))
283 return -EINVAL;
284
285 afinfo = xfrm_state_get_afinfo(family);
286 if (unlikely(afinfo == NULL))
287 return -EAFNOSUPPORT;
288
289 err = -ENOENT;
290 modemap = afinfo->mode_map;
291 spin_lock_bh(&xfrm_mode_lock);
292 if (likely(modemap[mode->encap] == mode)) {
293 modemap[mode->encap] = NULL;
294 module_put(mode->afinfo->owner);
295 err = 0;
296 }
297
298 spin_unlock_bh(&xfrm_mode_lock);
299 xfrm_state_put_afinfo(afinfo);
300 return err;
301 }
302 EXPORT_SYMBOL(xfrm_unregister_mode);
303
304 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
305 {
306 struct xfrm_state_afinfo *afinfo;
307 struct xfrm_mode *mode;
308 int modload_attempted = 0;
309
310 if (unlikely(encap >= XFRM_MODE_MAX))
311 return NULL;
312
313 retry:
314 afinfo = xfrm_state_get_afinfo(family);
315 if (unlikely(afinfo == NULL))
316 return NULL;
317
318 mode = afinfo->mode_map[encap];
319 if (unlikely(mode && !try_module_get(mode->owner)))
320 mode = NULL;
321 if (!mode && !modload_attempted) {
322 xfrm_state_put_afinfo(afinfo);
323 request_module("xfrm-mode-%d-%d", family, encap);
324 modload_attempted = 1;
325 goto retry;
326 }
327
328 xfrm_state_put_afinfo(afinfo);
329 return mode;
330 }
331
332 static void xfrm_put_mode(struct xfrm_mode *mode)
333 {
334 module_put(mode->owner);
335 }
336
337 static void xfrm_state_gc_destroy(struct xfrm_state *x)
338 {
339 tasklet_hrtimer_cancel(&x->mtimer);
340 del_timer_sync(&x->rtimer);
341 kfree(x->aalg);
342 kfree(x->ealg);
343 kfree(x->calg);
344 kfree(x->encap);
345 kfree(x->coaddr);
346 kfree(x->replay_esn);
347 kfree(x->preplay_esn);
348 if (x->inner_mode)
349 xfrm_put_mode(x->inner_mode);
350 if (x->inner_mode_iaf)
351 xfrm_put_mode(x->inner_mode_iaf);
352 if (x->outer_mode)
353 xfrm_put_mode(x->outer_mode);
354 if (x->type) {
355 x->type->destructor(x);
356 xfrm_put_type(x->type);
357 }
358 security_xfrm_state_free(x);
359 kfree(x);
360 }
361
362 static void xfrm_state_gc_task(struct work_struct *work)
363 {
364 struct net *net = container_of(work, struct net, xfrm.state_gc_work);
365 struct xfrm_state *x;
366 struct hlist_node *tmp;
367 struct hlist_head gc_list;
368
369 spin_lock_bh(&xfrm_state_gc_lock);
370 hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
371 spin_unlock_bh(&xfrm_state_gc_lock);
372
373 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
374 xfrm_state_gc_destroy(x);
375 }
376
377 static inline unsigned long make_jiffies(long secs)
378 {
379 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
380 return MAX_SCHEDULE_TIMEOUT-1;
381 else
382 return secs*HZ;
383 }
384
385 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
386 {
387 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
388 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
389 unsigned long now = get_seconds();
390 long next = LONG_MAX;
391 int warn = 0;
392 int err = 0;
393
394 spin_lock(&x->lock);
395 if (x->km.state == XFRM_STATE_DEAD)
396 goto out;
397 if (x->km.state == XFRM_STATE_EXPIRED)
398 goto expired;
399 if (x->lft.hard_add_expires_seconds) {
400 long tmo = x->lft.hard_add_expires_seconds +
401 x->curlft.add_time - now;
402 if (tmo <= 0) {
403 if (x->xflags & XFRM_SOFT_EXPIRE) {
404 /* enter hard expire without soft expire first?!
405 * setting a new date could trigger this.
406 * workarbound: fix x->curflt.add_time by below:
407 */
408 x->curlft.add_time = now - x->saved_tmo - 1;
409 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
410 } else
411 goto expired;
412 }
413 if (tmo < next)
414 next = tmo;
415 }
416 if (x->lft.hard_use_expires_seconds) {
417 long tmo = x->lft.hard_use_expires_seconds +
418 (x->curlft.use_time ? : now) - now;
419 if (tmo <= 0)
420 goto expired;
421 if (tmo < next)
422 next = tmo;
423 }
424 if (x->km.dying)
425 goto resched;
426 if (x->lft.soft_add_expires_seconds) {
427 long tmo = x->lft.soft_add_expires_seconds +
428 x->curlft.add_time - now;
429 if (tmo <= 0) {
430 warn = 1;
431 x->xflags &= ~XFRM_SOFT_EXPIRE;
432 } else if (tmo < next) {
433 next = tmo;
434 x->xflags |= XFRM_SOFT_EXPIRE;
435 x->saved_tmo = tmo;
436 }
437 }
438 if (x->lft.soft_use_expires_seconds) {
439 long tmo = x->lft.soft_use_expires_seconds +
440 (x->curlft.use_time ? : now) - now;
441 if (tmo <= 0)
442 warn = 1;
443 else if (tmo < next)
444 next = tmo;
445 }
446
447 x->km.dying = warn;
448 if (warn)
449 km_state_expired(x, 0, 0);
450 resched:
451 if (next != LONG_MAX) {
452 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
453 }
454
455 goto out;
456
457 expired:
458 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
459 x->km.state = XFRM_STATE_EXPIRED;
460
461 err = __xfrm_state_delete(x);
462 if (!err)
463 km_state_expired(x, 1, 0);
464
465 xfrm_audit_state_delete(x, err ? 0 : 1,
466 audit_get_loginuid(current),
467 audit_get_sessionid(current), 0);
468
469 out:
470 spin_unlock(&x->lock);
471 return HRTIMER_NORESTART;
472 }
473
474 static void xfrm_replay_timer_handler(unsigned long data);
475
476 struct xfrm_state *xfrm_state_alloc(struct net *net)
477 {
478 struct xfrm_state *x;
479
480 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
481
482 if (x) {
483 write_pnet(&x->xs_net, net);
484 atomic_set(&x->refcnt, 1);
485 atomic_set(&x->tunnel_users, 0);
486 INIT_LIST_HEAD(&x->km.all);
487 INIT_HLIST_NODE(&x->bydst);
488 INIT_HLIST_NODE(&x->bysrc);
489 INIT_HLIST_NODE(&x->byspi);
490 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
491 CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
492 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
493 (unsigned long)x);
494 x->curlft.add_time = get_seconds();
495 x->lft.soft_byte_limit = XFRM_INF;
496 x->lft.soft_packet_limit = XFRM_INF;
497 x->lft.hard_byte_limit = XFRM_INF;
498 x->lft.hard_packet_limit = XFRM_INF;
499 x->replay_maxage = 0;
500 x->replay_maxdiff = 0;
501 x->inner_mode = NULL;
502 x->inner_mode_iaf = NULL;
503 spin_lock_init(&x->lock);
504 }
505 return x;
506 }
507 EXPORT_SYMBOL(xfrm_state_alloc);
508
509 void __xfrm_state_destroy(struct xfrm_state *x)
510 {
511 struct net *net = xs_net(x);
512
513 WARN_ON(x->km.state != XFRM_STATE_DEAD);
514
515 spin_lock_bh(&xfrm_state_gc_lock);
516 hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
517 spin_unlock_bh(&xfrm_state_gc_lock);
518 schedule_work(&net->xfrm.state_gc_work);
519 }
520 EXPORT_SYMBOL(__xfrm_state_destroy);
521
522 int __xfrm_state_delete(struct xfrm_state *x)
523 {
524 struct net *net = xs_net(x);
525 int err = -ESRCH;
526
527 if (x->km.state != XFRM_STATE_DEAD) {
528 x->km.state = XFRM_STATE_DEAD;
529 spin_lock(&net->xfrm.xfrm_state_lock);
530 list_del(&x->km.all);
531 hlist_del(&x->bydst);
532 hlist_del(&x->bysrc);
533 if (x->id.spi)
534 hlist_del(&x->byspi);
535 net->xfrm.state_num--;
536 spin_unlock(&net->xfrm.xfrm_state_lock);
537
538 /* All xfrm_state objects are created by xfrm_state_alloc.
539 * The xfrm_state_alloc call gives a reference, and that
540 * is what we are dropping here.
541 */
542 xfrm_state_put(x);
543 err = 0;
544 }
545
546 return err;
547 }
548 EXPORT_SYMBOL(__xfrm_state_delete);
549
550 int xfrm_state_delete(struct xfrm_state *x)
551 {
552 int err;
553
554 spin_lock_bh(&x->lock);
555 err = __xfrm_state_delete(x);
556 spin_unlock_bh(&x->lock);
557
558 return err;
559 }
560 EXPORT_SYMBOL(xfrm_state_delete);
561
562 #ifdef CONFIG_SECURITY_NETWORK_XFRM
563 static inline int
564 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
565 {
566 int i, err = 0;
567
568 for (i = 0; i <= net->xfrm.state_hmask; i++) {
569 struct xfrm_state *x;
570
571 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
572 if (xfrm_id_proto_match(x->id.proto, proto) &&
573 (err = security_xfrm_state_delete(x)) != 0) {
574 xfrm_audit_state_delete(x, 0,
575 audit_info->loginuid,
576 audit_info->sessionid,
577 audit_info->secid);
578 return err;
579 }
580 }
581 }
582
583 return err;
584 }
585 #else
586 static inline int
587 xfrm_state_flush_secctx_check(struct net *net, u8 proto, struct xfrm_audit *audit_info)
588 {
589 return 0;
590 }
591 #endif
592
593 int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
594 {
595 int i, err = 0, cnt = 0;
596
597 spin_lock_bh(&net->xfrm.xfrm_state_lock);
598 err = xfrm_state_flush_secctx_check(net, proto, audit_info);
599 if (err)
600 goto out;
601
602 err = -ESRCH;
603 for (i = 0; i <= net->xfrm.state_hmask; i++) {
604 struct xfrm_state *x;
605 restart:
606 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
607 if (!xfrm_state_kern(x) &&
608 xfrm_id_proto_match(x->id.proto, proto)) {
609 xfrm_state_hold(x);
610 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
611
612 err = xfrm_state_delete(x);
613 xfrm_audit_state_delete(x, err ? 0 : 1,
614 audit_info->loginuid,
615 audit_info->sessionid,
616 audit_info->secid);
617 xfrm_state_put(x);
618 if (!err)
619 cnt++;
620
621 spin_lock_bh(&net->xfrm.xfrm_state_lock);
622 goto restart;
623 }
624 }
625 }
626 if (cnt)
627 err = 0;
628
629 out:
630 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
631 return err;
632 }
633 EXPORT_SYMBOL(xfrm_state_flush);
634
635 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
636 {
637 spin_lock_bh(&net->xfrm.xfrm_state_lock);
638 si->sadcnt = net->xfrm.state_num;
639 si->sadhcnt = net->xfrm.state_hmask;
640 si->sadhmcnt = xfrm_state_hashmax;
641 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
642 }
643 EXPORT_SYMBOL(xfrm_sad_getinfo);
644
645 static int
646 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
647 const struct xfrm_tmpl *tmpl,
648 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
649 unsigned short family)
650 {
651 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
652 if (!afinfo)
653 return -1;
654 afinfo->init_tempsel(&x->sel, fl);
655
656 if (family != tmpl->encap_family) {
657 xfrm_state_put_afinfo(afinfo);
658 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
659 if (!afinfo)
660 return -1;
661 }
662 afinfo->init_temprop(x, tmpl, daddr, saddr);
663 xfrm_state_put_afinfo(afinfo);
664 return 0;
665 }
666
667 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
668 const xfrm_address_t *daddr,
669 __be32 spi, u8 proto,
670 unsigned short family)
671 {
672 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
673 struct xfrm_state *x;
674
675 hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) {
676 if (x->props.family != family ||
677 x->id.spi != spi ||
678 x->id.proto != proto ||
679 !xfrm_addr_equal(&x->id.daddr, daddr, family))
680 continue;
681
682 if ((mark & x->mark.m) != x->mark.v)
683 continue;
684 xfrm_state_hold(x);
685 return x;
686 }
687
688 return NULL;
689 }
690
691 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
692 const xfrm_address_t *daddr,
693 const xfrm_address_t *saddr,
694 u8 proto, unsigned short family)
695 {
696 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
697 struct xfrm_state *x;
698
699 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
700 if (x->props.family != family ||
701 x->id.proto != proto ||
702 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
703 !xfrm_addr_equal(&x->props.saddr, saddr, family))
704 continue;
705
706 if ((mark & x->mark.m) != x->mark.v)
707 continue;
708 xfrm_state_hold(x);
709 return x;
710 }
711
712 return NULL;
713 }
714
715 static inline struct xfrm_state *
716 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
717 {
718 struct net *net = xs_net(x);
719 u32 mark = x->mark.v & x->mark.m;
720
721 if (use_spi)
722 return __xfrm_state_lookup(net, mark, &x->id.daddr,
723 x->id.spi, x->id.proto, family);
724 else
725 return __xfrm_state_lookup_byaddr(net, mark,
726 &x->id.daddr,
727 &x->props.saddr,
728 x->id.proto, family);
729 }
730
731 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
732 {
733 if (have_hash_collision &&
734 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
735 net->xfrm.state_num > net->xfrm.state_hmask)
736 schedule_work(&net->xfrm.state_hash_work);
737 }
738
739 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
740 const struct flowi *fl, unsigned short family,
741 struct xfrm_state **best, int *acq_in_progress,
742 int *error)
743 {
744 /* Resolution logic:
745 * 1. There is a valid state with matching selector. Done.
746 * 2. Valid state with inappropriate selector. Skip.
747 *
748 * Entering area of "sysdeps".
749 *
750 * 3. If state is not valid, selector is temporary, it selects
751 * only session which triggered previous resolution. Key
752 * manager will do something to install a state with proper
753 * selector.
754 */
755 if (x->km.state == XFRM_STATE_VALID) {
756 if ((x->sel.family &&
757 !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
758 !security_xfrm_state_pol_flow_match(x, pol, fl))
759 return;
760
761 if (!*best ||
762 (*best)->km.dying > x->km.dying ||
763 ((*best)->km.dying == x->km.dying &&
764 (*best)->curlft.add_time < x->curlft.add_time))
765 *best = x;
766 } else if (x->km.state == XFRM_STATE_ACQ) {
767 *acq_in_progress = 1;
768 } else if (x->km.state == XFRM_STATE_ERROR ||
769 x->km.state == XFRM_STATE_EXPIRED) {
770 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
771 security_xfrm_state_pol_flow_match(x, pol, fl))
772 *error = -ESRCH;
773 }
774 }
775
776 struct xfrm_state *
777 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
778 const struct flowi *fl, struct xfrm_tmpl *tmpl,
779 struct xfrm_policy *pol, int *err,
780 unsigned short family)
781 {
782 static xfrm_address_t saddr_wildcard = { };
783 struct net *net = xp_net(pol);
784 unsigned int h, h_wildcard;
785 struct xfrm_state *x, *x0, *to_put;
786 int acquire_in_progress = 0;
787 int error = 0;
788 struct xfrm_state *best = NULL;
789 u32 mark = pol->mark.v & pol->mark.m;
790 unsigned short encap_family = tmpl->encap_family;
791
792 to_put = NULL;
793
794 spin_lock_bh(&net->xfrm.xfrm_state_lock);
795 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
796 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
797 if (x->props.family == encap_family &&
798 x->props.reqid == tmpl->reqid &&
799 (mark & x->mark.m) == x->mark.v &&
800 !(x->props.flags & XFRM_STATE_WILDRECV) &&
801 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
802 tmpl->mode == x->props.mode &&
803 tmpl->id.proto == x->id.proto &&
804 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
805 xfrm_state_look_at(pol, x, fl, encap_family,
806 &best, &acquire_in_progress, &error);
807 }
808 if (best || acquire_in_progress)
809 goto found;
810
811 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
812 hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) {
813 if (x->props.family == encap_family &&
814 x->props.reqid == tmpl->reqid &&
815 (mark & x->mark.m) == x->mark.v &&
816 !(x->props.flags & XFRM_STATE_WILDRECV) &&
817 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
818 tmpl->mode == x->props.mode &&
819 tmpl->id.proto == x->id.proto &&
820 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
821 xfrm_state_look_at(pol, x, fl, encap_family,
822 &best, &acquire_in_progress, &error);
823 }
824
825 found:
826 x = best;
827 if (!x && !error && !acquire_in_progress) {
828 if (tmpl->id.spi &&
829 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
830 tmpl->id.proto, encap_family)) != NULL) {
831 to_put = x0;
832 error = -EEXIST;
833 goto out;
834 }
835 x = xfrm_state_alloc(net);
836 if (x == NULL) {
837 error = -ENOMEM;
838 goto out;
839 }
840 /* Initialize temporary state matching only
841 * to current session. */
842 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
843 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
844
845 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
846 if (error) {
847 x->km.state = XFRM_STATE_DEAD;
848 to_put = x;
849 x = NULL;
850 goto out;
851 }
852
853 if (km_query(x, tmpl, pol) == 0) {
854 x->km.state = XFRM_STATE_ACQ;
855 list_add(&x->km.all, &net->xfrm.state_all);
856 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
857 h = xfrm_src_hash(net, daddr, saddr, encap_family);
858 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
859 if (x->id.spi) {
860 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
861 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
862 }
863 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
864 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
865 net->xfrm.state_num++;
866 xfrm_hash_grow_check(net, x->bydst.next != NULL);
867 } else {
868 x->km.state = XFRM_STATE_DEAD;
869 to_put = x;
870 x = NULL;
871 error = -ESRCH;
872 }
873 }
874 out:
875 if (x)
876 xfrm_state_hold(x);
877 else
878 *err = acquire_in_progress ? -EAGAIN : error;
879 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
880 if (to_put)
881 xfrm_state_put(to_put);
882 return x;
883 }
884
885 struct xfrm_state *
886 xfrm_stateonly_find(struct net *net, u32 mark,
887 xfrm_address_t *daddr, xfrm_address_t *saddr,
888 unsigned short family, u8 mode, u8 proto, u32 reqid)
889 {
890 unsigned int h;
891 struct xfrm_state *rx = NULL, *x = NULL;
892
893 spin_lock_bh(&net->xfrm.xfrm_state_lock);
894 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
895 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
896 if (x->props.family == family &&
897 x->props.reqid == reqid &&
898 (mark & x->mark.m) == x->mark.v &&
899 !(x->props.flags & XFRM_STATE_WILDRECV) &&
900 xfrm_state_addr_check(x, daddr, saddr, family) &&
901 mode == x->props.mode &&
902 proto == x->id.proto &&
903 x->km.state == XFRM_STATE_VALID) {
904 rx = x;
905 break;
906 }
907 }
908
909 if (rx)
910 xfrm_state_hold(rx);
911 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
912
913
914 return rx;
915 }
916 EXPORT_SYMBOL(xfrm_stateonly_find);
917
918 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
919 unsigned short family)
920 {
921 struct xfrm_state *x;
922 struct xfrm_state_walk *w;
923
924 spin_lock_bh(&net->xfrm.xfrm_state_lock);
925 list_for_each_entry(w, &net->xfrm.state_all, all) {
926 x = container_of(w, struct xfrm_state, km);
927 if (x->props.family != family ||
928 x->id.spi != spi)
929 continue;
930
931 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
932 xfrm_state_hold(x);
933 return x;
934 }
935 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
936 return NULL;
937 }
938 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
939
940 static void __xfrm_state_insert(struct xfrm_state *x)
941 {
942 struct net *net = xs_net(x);
943 unsigned int h;
944
945 list_add(&x->km.all, &net->xfrm.state_all);
946
947 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
948 x->props.reqid, x->props.family);
949 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
950
951 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
952 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
953
954 if (x->id.spi) {
955 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
956 x->props.family);
957
958 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
959 }
960
961 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
962 if (x->replay_maxage)
963 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
964
965 net->xfrm.state_num++;
966
967 xfrm_hash_grow_check(net, x->bydst.next != NULL);
968 }
969
970 /* net->xfrm.xfrm_state_lock is held */
971 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
972 {
973 struct net *net = xs_net(xnew);
974 unsigned short family = xnew->props.family;
975 u32 reqid = xnew->props.reqid;
976 struct xfrm_state *x;
977 unsigned int h;
978 u32 mark = xnew->mark.v & xnew->mark.m;
979
980 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
981 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
982 if (x->props.family == family &&
983 x->props.reqid == reqid &&
984 (mark & x->mark.m) == x->mark.v &&
985 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
986 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
987 x->genid++;
988 }
989 }
990
991 void xfrm_state_insert(struct xfrm_state *x)
992 {
993 struct net *net = xs_net(x);
994
995 spin_lock_bh(&net->xfrm.xfrm_state_lock);
996 __xfrm_state_bump_genids(x);
997 __xfrm_state_insert(x);
998 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
999 }
1000 EXPORT_SYMBOL(xfrm_state_insert);
1001
1002 /* net->xfrm.xfrm_state_lock is held */
1003 static struct xfrm_state *__find_acq_core(struct net *net,
1004 const struct xfrm_mark *m,
1005 unsigned short family, u8 mode,
1006 u32 reqid, u8 proto,
1007 const xfrm_address_t *daddr,
1008 const xfrm_address_t *saddr,
1009 int create)
1010 {
1011 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1012 struct xfrm_state *x;
1013 u32 mark = m->v & m->m;
1014
1015 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1016 if (x->props.reqid != reqid ||
1017 x->props.mode != mode ||
1018 x->props.family != family ||
1019 x->km.state != XFRM_STATE_ACQ ||
1020 x->id.spi != 0 ||
1021 x->id.proto != proto ||
1022 (mark & x->mark.m) != x->mark.v ||
1023 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1024 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1025 continue;
1026
1027 xfrm_state_hold(x);
1028 return x;
1029 }
1030
1031 if (!create)
1032 return NULL;
1033
1034 x = xfrm_state_alloc(net);
1035 if (likely(x)) {
1036 switch (family) {
1037 case AF_INET:
1038 x->sel.daddr.a4 = daddr->a4;
1039 x->sel.saddr.a4 = saddr->a4;
1040 x->sel.prefixlen_d = 32;
1041 x->sel.prefixlen_s = 32;
1042 x->props.saddr.a4 = saddr->a4;
1043 x->id.daddr.a4 = daddr->a4;
1044 break;
1045
1046 case AF_INET6:
1047 *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr;
1048 *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr;
1049 x->sel.prefixlen_d = 128;
1050 x->sel.prefixlen_s = 128;
1051 *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr;
1052 *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr;
1053 break;
1054 }
1055
1056 x->km.state = XFRM_STATE_ACQ;
1057 x->id.proto = proto;
1058 x->props.family = family;
1059 x->props.mode = mode;
1060 x->props.reqid = reqid;
1061 x->mark.v = m->v;
1062 x->mark.m = m->m;
1063 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1064 xfrm_state_hold(x);
1065 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1066 list_add(&x->km.all, &net->xfrm.state_all);
1067 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1068 h = xfrm_src_hash(net, daddr, saddr, family);
1069 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1070
1071 net->xfrm.state_num++;
1072
1073 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1074 }
1075
1076 return x;
1077 }
1078
1079 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1080
1081 int xfrm_state_add(struct xfrm_state *x)
1082 {
1083 struct net *net = xs_net(x);
1084 struct xfrm_state *x1, *to_put;
1085 int family;
1086 int err;
1087 u32 mark = x->mark.v & x->mark.m;
1088 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1089
1090 family = x->props.family;
1091
1092 to_put = NULL;
1093
1094 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1095
1096 x1 = __xfrm_state_locate(x, use_spi, family);
1097 if (x1) {
1098 to_put = x1;
1099 x1 = NULL;
1100 err = -EEXIST;
1101 goto out;
1102 }
1103
1104 if (use_spi && x->km.seq) {
1105 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1106 if (x1 && ((x1->id.proto != x->id.proto) ||
1107 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1108 to_put = x1;
1109 x1 = NULL;
1110 }
1111 }
1112
1113 if (use_spi && !x1)
1114 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1115 x->props.reqid, x->id.proto,
1116 &x->id.daddr, &x->props.saddr, 0);
1117
1118 __xfrm_state_bump_genids(x);
1119 __xfrm_state_insert(x);
1120 err = 0;
1121
1122 out:
1123 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1124
1125 if (x1) {
1126 xfrm_state_delete(x1);
1127 xfrm_state_put(x1);
1128 }
1129
1130 if (to_put)
1131 xfrm_state_put(to_put);
1132
1133 return err;
1134 }
1135 EXPORT_SYMBOL(xfrm_state_add);
1136
1137 #ifdef CONFIG_XFRM_MIGRATE
1138 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, int *errp)
1139 {
1140 struct net *net = xs_net(orig);
1141 int err = -ENOMEM;
1142 struct xfrm_state *x = xfrm_state_alloc(net);
1143 if (!x)
1144 goto out;
1145
1146 memcpy(&x->id, &orig->id, sizeof(x->id));
1147 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1148 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1149 x->props.mode = orig->props.mode;
1150 x->props.replay_window = orig->props.replay_window;
1151 x->props.reqid = orig->props.reqid;
1152 x->props.family = orig->props.family;
1153 x->props.saddr = orig->props.saddr;
1154
1155 if (orig->aalg) {
1156 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1157 if (!x->aalg)
1158 goto error;
1159 }
1160 x->props.aalgo = orig->props.aalgo;
1161
1162 if (orig->ealg) {
1163 x->ealg = xfrm_algo_clone(orig->ealg);
1164 if (!x->ealg)
1165 goto error;
1166 }
1167 x->props.ealgo = orig->props.ealgo;
1168
1169 if (orig->calg) {
1170 x->calg = xfrm_algo_clone(orig->calg);
1171 if (!x->calg)
1172 goto error;
1173 }
1174 x->props.calgo = orig->props.calgo;
1175
1176 if (orig->encap) {
1177 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1178 if (!x->encap)
1179 goto error;
1180 }
1181
1182 if (orig->coaddr) {
1183 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1184 GFP_KERNEL);
1185 if (!x->coaddr)
1186 goto error;
1187 }
1188
1189 if (orig->replay_esn) {
1190 err = xfrm_replay_clone(x, orig);
1191 if (err)
1192 goto error;
1193 }
1194
1195 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1196
1197 err = xfrm_init_state(x);
1198 if (err)
1199 goto error;
1200
1201 x->props.flags = orig->props.flags;
1202 x->props.extra_flags = orig->props.extra_flags;
1203
1204 x->curlft.add_time = orig->curlft.add_time;
1205 x->km.state = orig->km.state;
1206 x->km.seq = orig->km.seq;
1207
1208 return x;
1209
1210 error:
1211 xfrm_state_put(x);
1212 out:
1213 if (errp)
1214 *errp = err;
1215 return NULL;
1216 }
1217
1218 /* net->xfrm.xfrm_state_lock is held */
1219 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1220 {
1221 unsigned int h;
1222 struct xfrm_state *x;
1223
1224 if (m->reqid) {
1225 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1226 m->reqid, m->old_family);
1227 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1228 if (x->props.mode != m->mode ||
1229 x->id.proto != m->proto)
1230 continue;
1231 if (m->reqid && x->props.reqid != m->reqid)
1232 continue;
1233 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1234 m->old_family) ||
1235 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1236 m->old_family))
1237 continue;
1238 xfrm_state_hold(x);
1239 return x;
1240 }
1241 } else {
1242 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1243 m->old_family);
1244 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1245 if (x->props.mode != m->mode ||
1246 x->id.proto != m->proto)
1247 continue;
1248 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1249 m->old_family) ||
1250 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1251 m->old_family))
1252 continue;
1253 xfrm_state_hold(x);
1254 return x;
1255 }
1256 }
1257
1258 return NULL;
1259 }
1260 EXPORT_SYMBOL(xfrm_migrate_state_find);
1261
1262 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1263 struct xfrm_migrate *m)
1264 {
1265 struct xfrm_state *xc;
1266 int err;
1267
1268 xc = xfrm_state_clone(x, &err);
1269 if (!xc)
1270 return NULL;
1271
1272 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1273 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1274
1275 /* add state */
1276 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1277 /* a care is needed when the destination address of the
1278 state is to be updated as it is a part of triplet */
1279 xfrm_state_insert(xc);
1280 } else {
1281 if ((err = xfrm_state_add(xc)) < 0)
1282 goto error;
1283 }
1284
1285 return xc;
1286 error:
1287 xfrm_state_put(xc);
1288 return NULL;
1289 }
1290 EXPORT_SYMBOL(xfrm_state_migrate);
1291 #endif
1292
1293 int xfrm_state_update(struct xfrm_state *x)
1294 {
1295 struct xfrm_state *x1, *to_put;
1296 int err;
1297 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1298 struct net *net = xs_net(x);
1299
1300 to_put = NULL;
1301
1302 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1303 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1304
1305 err = -ESRCH;
1306 if (!x1)
1307 goto out;
1308
1309 if (xfrm_state_kern(x1)) {
1310 to_put = x1;
1311 err = -EEXIST;
1312 goto out;
1313 }
1314
1315 if (x1->km.state == XFRM_STATE_ACQ) {
1316 __xfrm_state_insert(x);
1317 x = NULL;
1318 }
1319 err = 0;
1320
1321 out:
1322 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1323
1324 if (to_put)
1325 xfrm_state_put(to_put);
1326
1327 if (err)
1328 return err;
1329
1330 if (!x) {
1331 xfrm_state_delete(x1);
1332 xfrm_state_put(x1);
1333 return 0;
1334 }
1335
1336 err = -EINVAL;
1337 spin_lock_bh(&x1->lock);
1338 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1339 if (x->encap && x1->encap)
1340 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1341 if (x->coaddr && x1->coaddr) {
1342 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1343 }
1344 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1345 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1346 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1347 x1->km.dying = 0;
1348
1349 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1350 if (x1->curlft.use_time)
1351 xfrm_state_check_expire(x1);
1352
1353 err = 0;
1354 x->km.state = XFRM_STATE_DEAD;
1355 __xfrm_state_put(x);
1356 }
1357 spin_unlock_bh(&x1->lock);
1358
1359 xfrm_state_put(x1);
1360
1361 return err;
1362 }
1363 EXPORT_SYMBOL(xfrm_state_update);
1364
1365 int xfrm_state_check_expire(struct xfrm_state *x)
1366 {
1367 if (!x->curlft.use_time)
1368 x->curlft.use_time = get_seconds();
1369
1370 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1371 x->curlft.packets >= x->lft.hard_packet_limit) {
1372 x->km.state = XFRM_STATE_EXPIRED;
1373 tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL);
1374 return -EINVAL;
1375 }
1376
1377 if (!x->km.dying &&
1378 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1379 x->curlft.packets >= x->lft.soft_packet_limit)) {
1380 x->km.dying = 1;
1381 km_state_expired(x, 0, 0);
1382 }
1383 return 0;
1384 }
1385 EXPORT_SYMBOL(xfrm_state_check_expire);
1386
1387 struct xfrm_state *
1388 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1389 u8 proto, unsigned short family)
1390 {
1391 struct xfrm_state *x;
1392
1393 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1394 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1395 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1396 return x;
1397 }
1398 EXPORT_SYMBOL(xfrm_state_lookup);
1399
1400 struct xfrm_state *
1401 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1402 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1403 u8 proto, unsigned short family)
1404 {
1405 struct xfrm_state *x;
1406
1407 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1408 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1409 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1410 return x;
1411 }
1412 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1413
1414 struct xfrm_state *
1415 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1416 u8 proto, const xfrm_address_t *daddr,
1417 const xfrm_address_t *saddr, int create, unsigned short family)
1418 {
1419 struct xfrm_state *x;
1420
1421 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1422 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1423 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1424
1425 return x;
1426 }
1427 EXPORT_SYMBOL(xfrm_find_acq);
1428
1429 #ifdef CONFIG_XFRM_SUB_POLICY
1430 int
1431 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1432 unsigned short family, struct net *net)
1433 {
1434 int err = 0;
1435 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1436 if (!afinfo)
1437 return -EAFNOSUPPORT;
1438
1439 spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1440 if (afinfo->tmpl_sort)
1441 err = afinfo->tmpl_sort(dst, src, n);
1442 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1443 xfrm_state_put_afinfo(afinfo);
1444 return err;
1445 }
1446 EXPORT_SYMBOL(xfrm_tmpl_sort);
1447
1448 int
1449 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1450 unsigned short family)
1451 {
1452 int err = 0;
1453 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1454 struct net *net = xs_net(*src);
1455
1456 if (!afinfo)
1457 return -EAFNOSUPPORT;
1458
1459 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1460 if (afinfo->state_sort)
1461 err = afinfo->state_sort(dst, src, n);
1462 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1463 xfrm_state_put_afinfo(afinfo);
1464 return err;
1465 }
1466 EXPORT_SYMBOL(xfrm_state_sort);
1467 #endif
1468
1469 /* Silly enough, but I'm lazy to build resolution list */
1470
1471 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1472 {
1473 int i;
1474
1475 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1476 struct xfrm_state *x;
1477
1478 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1479 if (x->km.seq == seq &&
1480 (mark & x->mark.m) == x->mark.v &&
1481 x->km.state == XFRM_STATE_ACQ) {
1482 xfrm_state_hold(x);
1483 return x;
1484 }
1485 }
1486 }
1487 return NULL;
1488 }
1489
1490 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1491 {
1492 struct xfrm_state *x;
1493
1494 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1495 x = __xfrm_find_acq_byseq(net, mark, seq);
1496 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1497 return x;
1498 }
1499 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1500
1501 u32 xfrm_get_acqseq(void)
1502 {
1503 u32 res;
1504 static atomic_t acqseq;
1505
1506 do {
1507 res = atomic_inc_return(&acqseq);
1508 } while (!res);
1509
1510 return res;
1511 }
1512 EXPORT_SYMBOL(xfrm_get_acqseq);
1513
1514 int verify_spi_info(u8 proto, u32 min, u32 max)
1515 {
1516 switch (proto) {
1517 case IPPROTO_AH:
1518 case IPPROTO_ESP:
1519 break;
1520
1521 case IPPROTO_COMP:
1522 /* IPCOMP spi is 16-bits. */
1523 if (max >= 0x10000)
1524 return -EINVAL;
1525 break;
1526
1527 default:
1528 return -EINVAL;
1529 }
1530
1531 if (min > max)
1532 return -EINVAL;
1533
1534 return 0;
1535 }
1536 EXPORT_SYMBOL(verify_spi_info);
1537
1538 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1539 {
1540 struct net *net = xs_net(x);
1541 unsigned int h;
1542 struct xfrm_state *x0;
1543 int err = -ENOENT;
1544 __be32 minspi = htonl(low);
1545 __be32 maxspi = htonl(high);
1546 u32 mark = x->mark.v & x->mark.m;
1547
1548 spin_lock_bh(&x->lock);
1549 if (x->km.state == XFRM_STATE_DEAD)
1550 goto unlock;
1551
1552 err = 0;
1553 if (x->id.spi)
1554 goto unlock;
1555
1556 err = -ENOENT;
1557
1558 if (minspi == maxspi) {
1559 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1560 if (x0) {
1561 xfrm_state_put(x0);
1562 goto unlock;
1563 }
1564 x->id.spi = minspi;
1565 } else {
1566 u32 spi = 0;
1567 for (h = 0; h < high-low+1; h++) {
1568 spi = low + prandom_u32()%(high-low+1);
1569 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1570 if (x0 == NULL) {
1571 x->id.spi = htonl(spi);
1572 break;
1573 }
1574 xfrm_state_put(x0);
1575 }
1576 }
1577 if (x->id.spi) {
1578 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1579 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1580 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1581 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1582
1583 err = 0;
1584 }
1585
1586 unlock:
1587 spin_unlock_bh(&x->lock);
1588
1589 return err;
1590 }
1591 EXPORT_SYMBOL(xfrm_alloc_spi);
1592
1593 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1594 int (*func)(struct xfrm_state *, int, void*),
1595 void *data)
1596 {
1597 struct xfrm_state *state;
1598 struct xfrm_state_walk *x;
1599 int err = 0;
1600
1601 if (walk->seq != 0 && list_empty(&walk->all))
1602 return 0;
1603
1604 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1605 if (list_empty(&walk->all))
1606 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1607 else
1608 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1609 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1610 if (x->state == XFRM_STATE_DEAD)
1611 continue;
1612 state = container_of(x, struct xfrm_state, km);
1613 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1614 continue;
1615 err = func(state, walk->seq, data);
1616 if (err) {
1617 list_move_tail(&walk->all, &x->all);
1618 goto out;
1619 }
1620 walk->seq++;
1621 }
1622 if (walk->seq == 0) {
1623 err = -ENOENT;
1624 goto out;
1625 }
1626 list_del_init(&walk->all);
1627 out:
1628 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1629 return err;
1630 }
1631 EXPORT_SYMBOL(xfrm_state_walk);
1632
1633 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1634 {
1635 INIT_LIST_HEAD(&walk->all);
1636 walk->proto = proto;
1637 walk->state = XFRM_STATE_DEAD;
1638 walk->seq = 0;
1639 }
1640 EXPORT_SYMBOL(xfrm_state_walk_init);
1641
1642 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1643 {
1644 if (list_empty(&walk->all))
1645 return;
1646
1647 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1648 list_del(&walk->all);
1649 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1650 }
1651 EXPORT_SYMBOL(xfrm_state_walk_done);
1652
1653 static void xfrm_replay_timer_handler(unsigned long data)
1654 {
1655 struct xfrm_state *x = (struct xfrm_state *)data;
1656
1657 spin_lock(&x->lock);
1658
1659 if (x->km.state == XFRM_STATE_VALID) {
1660 if (xfrm_aevent_is_on(xs_net(x)))
1661 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1662 else
1663 x->xflags |= XFRM_TIME_DEFER;
1664 }
1665
1666 spin_unlock(&x->lock);
1667 }
1668
1669 static LIST_HEAD(xfrm_km_list);
1670
1671 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1672 {
1673 struct xfrm_mgr *km;
1674
1675 rcu_read_lock();
1676 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1677 if (km->notify_policy)
1678 km->notify_policy(xp, dir, c);
1679 rcu_read_unlock();
1680 }
1681
1682 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1683 {
1684 struct xfrm_mgr *km;
1685 rcu_read_lock();
1686 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1687 if (km->notify)
1688 km->notify(x, c);
1689 rcu_read_unlock();
1690 }
1691
1692 EXPORT_SYMBOL(km_policy_notify);
1693 EXPORT_SYMBOL(km_state_notify);
1694
1695 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1696 {
1697 struct km_event c;
1698
1699 c.data.hard = hard;
1700 c.portid = portid;
1701 c.event = XFRM_MSG_EXPIRE;
1702 km_state_notify(x, &c);
1703 }
1704
1705 EXPORT_SYMBOL(km_state_expired);
1706 /*
1707 * We send to all registered managers regardless of failure
1708 * We are happy with one success
1709 */
1710 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1711 {
1712 int err = -EINVAL, acqret;
1713 struct xfrm_mgr *km;
1714
1715 rcu_read_lock();
1716 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1717 acqret = km->acquire(x, t, pol);
1718 if (!acqret)
1719 err = acqret;
1720 }
1721 rcu_read_unlock();
1722 return err;
1723 }
1724 EXPORT_SYMBOL(km_query);
1725
1726 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1727 {
1728 int err = -EINVAL;
1729 struct xfrm_mgr *km;
1730
1731 rcu_read_lock();
1732 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1733 if (km->new_mapping)
1734 err = km->new_mapping(x, ipaddr, sport);
1735 if (!err)
1736 break;
1737 }
1738 rcu_read_unlock();
1739 return err;
1740 }
1741 EXPORT_SYMBOL(km_new_mapping);
1742
1743 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1744 {
1745 struct km_event c;
1746
1747 c.data.hard = hard;
1748 c.portid = portid;
1749 c.event = XFRM_MSG_POLEXPIRE;
1750 km_policy_notify(pol, dir, &c);
1751 }
1752 EXPORT_SYMBOL(km_policy_expired);
1753
1754 #ifdef CONFIG_XFRM_MIGRATE
1755 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1756 const struct xfrm_migrate *m, int num_migrate,
1757 const struct xfrm_kmaddress *k)
1758 {
1759 int err = -EINVAL;
1760 int ret;
1761 struct xfrm_mgr *km;
1762
1763 rcu_read_lock();
1764 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1765 if (km->migrate) {
1766 ret = km->migrate(sel, dir, type, m, num_migrate, k);
1767 if (!ret)
1768 err = ret;
1769 }
1770 }
1771 rcu_read_unlock();
1772 return err;
1773 }
1774 EXPORT_SYMBOL(km_migrate);
1775 #endif
1776
1777 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1778 {
1779 int err = -EINVAL;
1780 int ret;
1781 struct xfrm_mgr *km;
1782
1783 rcu_read_lock();
1784 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1785 if (km->report) {
1786 ret = km->report(net, proto, sel, addr);
1787 if (!ret)
1788 err = ret;
1789 }
1790 }
1791 rcu_read_unlock();
1792 return err;
1793 }
1794 EXPORT_SYMBOL(km_report);
1795
1796 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1797 {
1798 int err;
1799 u8 *data;
1800 struct xfrm_mgr *km;
1801 struct xfrm_policy *pol = NULL;
1802
1803 if (optlen <= 0 || optlen > PAGE_SIZE)
1804 return -EMSGSIZE;
1805
1806 data = kmalloc(optlen, GFP_KERNEL);
1807 if (!data)
1808 return -ENOMEM;
1809
1810 err = -EFAULT;
1811 if (copy_from_user(data, optval, optlen))
1812 goto out;
1813
1814 err = -EINVAL;
1815 rcu_read_lock();
1816 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1817 pol = km->compile_policy(sk, optname, data,
1818 optlen, &err);
1819 if (err >= 0)
1820 break;
1821 }
1822 rcu_read_unlock();
1823
1824 if (err >= 0) {
1825 xfrm_sk_policy_insert(sk, err, pol);
1826 xfrm_pol_put(pol);
1827 err = 0;
1828 }
1829
1830 out:
1831 kfree(data);
1832 return err;
1833 }
1834 EXPORT_SYMBOL(xfrm_user_policy);
1835
1836 static DEFINE_SPINLOCK(xfrm_km_lock);
1837
1838 int xfrm_register_km(struct xfrm_mgr *km)
1839 {
1840 spin_lock_bh(&xfrm_km_lock);
1841 list_add_tail_rcu(&km->list, &xfrm_km_list);
1842 spin_unlock_bh(&xfrm_km_lock);
1843 return 0;
1844 }
1845 EXPORT_SYMBOL(xfrm_register_km);
1846
1847 int xfrm_unregister_km(struct xfrm_mgr *km)
1848 {
1849 spin_lock_bh(&xfrm_km_lock);
1850 list_del_rcu(&km->list);
1851 spin_unlock_bh(&xfrm_km_lock);
1852 synchronize_rcu();
1853 return 0;
1854 }
1855 EXPORT_SYMBOL(xfrm_unregister_km);
1856
1857 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1858 {
1859 int err = 0;
1860 if (unlikely(afinfo == NULL))
1861 return -EINVAL;
1862 if (unlikely(afinfo->family >= NPROTO))
1863 return -EAFNOSUPPORT;
1864 spin_lock_bh(&xfrm_state_afinfo_lock);
1865 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1866 err = -ENOBUFS;
1867 else
1868 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1869 spin_unlock_bh(&xfrm_state_afinfo_lock);
1870 return err;
1871 }
1872 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1873
1874 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1875 {
1876 int err = 0;
1877 if (unlikely(afinfo == NULL))
1878 return -EINVAL;
1879 if (unlikely(afinfo->family >= NPROTO))
1880 return -EAFNOSUPPORT;
1881 spin_lock_bh(&xfrm_state_afinfo_lock);
1882 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1883 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1884 err = -EINVAL;
1885 else
1886 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1887 }
1888 spin_unlock_bh(&xfrm_state_afinfo_lock);
1889 synchronize_rcu();
1890 return err;
1891 }
1892 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1893
1894 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1895 {
1896 struct xfrm_state_afinfo *afinfo;
1897 if (unlikely(family >= NPROTO))
1898 return NULL;
1899 rcu_read_lock();
1900 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1901 if (unlikely(!afinfo))
1902 rcu_read_unlock();
1903 return afinfo;
1904 }
1905
1906 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1907 {
1908 rcu_read_unlock();
1909 }
1910
1911 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1912 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1913 {
1914 if (x->tunnel) {
1915 struct xfrm_state *t = x->tunnel;
1916
1917 if (atomic_read(&t->tunnel_users) == 2)
1918 xfrm_state_delete(t);
1919 atomic_dec(&t->tunnel_users);
1920 xfrm_state_put(t);
1921 x->tunnel = NULL;
1922 }
1923 }
1924 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1925
1926 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1927 {
1928 int res;
1929
1930 spin_lock_bh(&x->lock);
1931 if (x->km.state == XFRM_STATE_VALID &&
1932 x->type && x->type->get_mtu)
1933 res = x->type->get_mtu(x, mtu);
1934 else
1935 res = mtu - x->props.header_len;
1936 spin_unlock_bh(&x->lock);
1937 return res;
1938 }
1939
1940 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
1941 {
1942 struct xfrm_state_afinfo *afinfo;
1943 struct xfrm_mode *inner_mode;
1944 int family = x->props.family;
1945 int err;
1946
1947 err = -EAFNOSUPPORT;
1948 afinfo = xfrm_state_get_afinfo(family);
1949 if (!afinfo)
1950 goto error;
1951
1952 err = 0;
1953 if (afinfo->init_flags)
1954 err = afinfo->init_flags(x);
1955
1956 xfrm_state_put_afinfo(afinfo);
1957
1958 if (err)
1959 goto error;
1960
1961 err = -EPROTONOSUPPORT;
1962
1963 if (x->sel.family != AF_UNSPEC) {
1964 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
1965 if (inner_mode == NULL)
1966 goto error;
1967
1968 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
1969 family != x->sel.family) {
1970 xfrm_put_mode(inner_mode);
1971 goto error;
1972 }
1973
1974 x->inner_mode = inner_mode;
1975 } else {
1976 struct xfrm_mode *inner_mode_iaf;
1977 int iafamily = AF_INET;
1978
1979 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
1980 if (inner_mode == NULL)
1981 goto error;
1982
1983 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
1984 xfrm_put_mode(inner_mode);
1985 goto error;
1986 }
1987 x->inner_mode = inner_mode;
1988
1989 if (x->props.family == AF_INET)
1990 iafamily = AF_INET6;
1991
1992 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
1993 if (inner_mode_iaf) {
1994 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
1995 x->inner_mode_iaf = inner_mode_iaf;
1996 else
1997 xfrm_put_mode(inner_mode_iaf);
1998 }
1999 }
2000
2001 x->type = xfrm_get_type(x->id.proto, family);
2002 if (x->type == NULL)
2003 goto error;
2004
2005 err = x->type->init_state(x);
2006 if (err)
2007 goto error;
2008
2009 x->outer_mode = xfrm_get_mode(x->props.mode, family);
2010 if (x->outer_mode == NULL) {
2011 err = -EPROTONOSUPPORT;
2012 goto error;
2013 }
2014
2015 if (init_replay) {
2016 err = xfrm_init_replay(x);
2017 if (err)
2018 goto error;
2019 }
2020
2021 x->km.state = XFRM_STATE_VALID;
2022
2023 error:
2024 return err;
2025 }
2026
2027 EXPORT_SYMBOL(__xfrm_init_state);
2028
2029 int xfrm_init_state(struct xfrm_state *x)
2030 {
2031 return __xfrm_init_state(x, true);
2032 }
2033
2034 EXPORT_SYMBOL(xfrm_init_state);
2035
2036 int __net_init xfrm_state_init(struct net *net)
2037 {
2038 unsigned int sz;
2039
2040 INIT_LIST_HEAD(&net->xfrm.state_all);
2041
2042 sz = sizeof(struct hlist_head) * 8;
2043
2044 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2045 if (!net->xfrm.state_bydst)
2046 goto out_bydst;
2047 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2048 if (!net->xfrm.state_bysrc)
2049 goto out_bysrc;
2050 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2051 if (!net->xfrm.state_byspi)
2052 goto out_byspi;
2053 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2054
2055 net->xfrm.state_num = 0;
2056 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2057 INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2058 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2059 spin_lock_init(&net->xfrm.xfrm_state_lock);
2060 return 0;
2061
2062 out_byspi:
2063 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2064 out_bysrc:
2065 xfrm_hash_free(net->xfrm.state_bydst, sz);
2066 out_bydst:
2067 return -ENOMEM;
2068 }
2069
2070 void xfrm_state_fini(struct net *net)
2071 {
2072 struct xfrm_audit audit_info;
2073 unsigned int sz;
2074
2075 flush_work(&net->xfrm.state_hash_work);
2076 audit_info.loginuid = INVALID_UID;
2077 audit_info.sessionid = (unsigned int)-1;
2078 audit_info.secid = 0;
2079 xfrm_state_flush(net, IPSEC_PROTO_ANY, &audit_info);
2080 flush_work(&net->xfrm.state_gc_work);
2081
2082 WARN_ON(!list_empty(&net->xfrm.state_all));
2083
2084 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2085 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2086 xfrm_hash_free(net->xfrm.state_byspi, sz);
2087 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2088 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2089 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2090 xfrm_hash_free(net->xfrm.state_bydst, sz);
2091 }
2092
2093 #ifdef CONFIG_AUDITSYSCALL
2094 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2095 struct audit_buffer *audit_buf)
2096 {
2097 struct xfrm_sec_ctx *ctx = x->security;
2098 u32 spi = ntohl(x->id.spi);
2099
2100 if (ctx)
2101 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2102 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2103
2104 switch (x->props.family) {
2105 case AF_INET:
2106 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2107 &x->props.saddr.a4, &x->id.daddr.a4);
2108 break;
2109 case AF_INET6:
2110 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2111 x->props.saddr.a6, x->id.daddr.a6);
2112 break;
2113 }
2114
2115 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2116 }
2117
2118 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2119 struct audit_buffer *audit_buf)
2120 {
2121 const struct iphdr *iph4;
2122 const struct ipv6hdr *iph6;
2123
2124 switch (family) {
2125 case AF_INET:
2126 iph4 = ip_hdr(skb);
2127 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2128 &iph4->saddr, &iph4->daddr);
2129 break;
2130 case AF_INET6:
2131 iph6 = ipv6_hdr(skb);
2132 audit_log_format(audit_buf,
2133 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2134 &iph6->saddr, &iph6->daddr,
2135 iph6->flow_lbl[0] & 0x0f,
2136 iph6->flow_lbl[1],
2137 iph6->flow_lbl[2]);
2138 break;
2139 }
2140 }
2141
2142 void xfrm_audit_state_add(struct xfrm_state *x, int result,
2143 kuid_t auid, unsigned int sessionid, u32 secid)
2144 {
2145 struct audit_buffer *audit_buf;
2146
2147 audit_buf = xfrm_audit_start("SAD-add");
2148 if (audit_buf == NULL)
2149 return;
2150 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2151 xfrm_audit_helper_sainfo(x, audit_buf);
2152 audit_log_format(audit_buf, " res=%u", result);
2153 audit_log_end(audit_buf);
2154 }
2155 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2156
2157 void xfrm_audit_state_delete(struct xfrm_state *x, int result,
2158 kuid_t auid, unsigned int sessionid, u32 secid)
2159 {
2160 struct audit_buffer *audit_buf;
2161
2162 audit_buf = xfrm_audit_start("SAD-delete");
2163 if (audit_buf == NULL)
2164 return;
2165 xfrm_audit_helper_usrinfo(auid, sessionid, secid, audit_buf);
2166 xfrm_audit_helper_sainfo(x, audit_buf);
2167 audit_log_format(audit_buf, " res=%u", result);
2168 audit_log_end(audit_buf);
2169 }
2170 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2171
2172 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2173 struct sk_buff *skb)
2174 {
2175 struct audit_buffer *audit_buf;
2176 u32 spi;
2177
2178 audit_buf = xfrm_audit_start("SA-replay-overflow");
2179 if (audit_buf == NULL)
2180 return;
2181 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2182 /* don't record the sequence number because it's inherent in this kind
2183 * of audit message */
2184 spi = ntohl(x->id.spi);
2185 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2186 audit_log_end(audit_buf);
2187 }
2188 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2189
2190 void xfrm_audit_state_replay(struct xfrm_state *x,
2191 struct sk_buff *skb, __be32 net_seq)
2192 {
2193 struct audit_buffer *audit_buf;
2194 u32 spi;
2195
2196 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2197 if (audit_buf == NULL)
2198 return;
2199 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2200 spi = ntohl(x->id.spi);
2201 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2202 spi, spi, ntohl(net_seq));
2203 audit_log_end(audit_buf);
2204 }
2205 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2206
2207 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2208 {
2209 struct audit_buffer *audit_buf;
2210
2211 audit_buf = xfrm_audit_start("SA-notfound");
2212 if (audit_buf == NULL)
2213 return;
2214 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2215 audit_log_end(audit_buf);
2216 }
2217 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2218
2219 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2220 __be32 net_spi, __be32 net_seq)
2221 {
2222 struct audit_buffer *audit_buf;
2223 u32 spi;
2224
2225 audit_buf = xfrm_audit_start("SA-notfound");
2226 if (audit_buf == NULL)
2227 return;
2228 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2229 spi = ntohl(net_spi);
2230 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2231 spi, spi, ntohl(net_seq));
2232 audit_log_end(audit_buf);
2233 }
2234 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2235
2236 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2237 struct sk_buff *skb, u8 proto)
2238 {
2239 struct audit_buffer *audit_buf;
2240 __be32 net_spi;
2241 __be32 net_seq;
2242
2243 audit_buf = xfrm_audit_start("SA-icv-failure");
2244 if (audit_buf == NULL)
2245 return;
2246 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2247 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2248 u32 spi = ntohl(net_spi);
2249 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2250 spi, spi, ntohl(net_seq));
2251 }
2252 audit_log_end(audit_buf);
2253 }
2254 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2255 #endif /* CONFIG_AUDITSYSCALL */
Linux kernel - Deliverables
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