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Merge remote-tracking branch 'regulator/fix/max77802' into regulator-linus
[mirror_ubuntu-artful-kernel.git] / net / xfrm / xfrm_state.c
1 /*
2 * xfrm_state.c
3 *
4 * Changes:
5 * Mitsuru KANDA @USAGI
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
8 * IPv6 support
9 * YOSHIFUJI Hideaki @USAGI
10 * Split up af-specific functions
11 * Derek Atkins <derek@ihtfp.com>
12 * Add UDP Encapsulation
13 *
14 */
15
16 #include <linux/workqueue.h>
17 #include <net/xfrm.h>
18 #include <linux/pfkeyv2.h>
19 #include <linux/ipsec.h>
20 #include <linux/module.h>
21 #include <linux/cache.h>
22 #include <linux/audit.h>
23 #include <linux/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 #define xfrm_state_deref_prot(table, net) \
32 rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
33
34 static void xfrm_state_gc_task(struct work_struct *work);
35
36 /* Each xfrm_state may be linked to two tables:
37
38 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
39 2. Hash table by (daddr,family,reqid) to find what SAs exist for given
40 destination/tunnel endpoint. (output)
41 */
42
43 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
44 static __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation);
45
46 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
47 static HLIST_HEAD(xfrm_state_gc_list);
48
49 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
50 {
51 return atomic_inc_not_zero(&x->refcnt);
52 }
53
54 static inline unsigned int xfrm_dst_hash(struct net *net,
55 const xfrm_address_t *daddr,
56 const xfrm_address_t *saddr,
57 u32 reqid,
58 unsigned short family)
59 {
60 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
61 }
62
63 static inline unsigned int xfrm_src_hash(struct net *net,
64 const xfrm_address_t *daddr,
65 const xfrm_address_t *saddr,
66 unsigned short family)
67 {
68 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
69 }
70
71 static inline unsigned int
72 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
73 __be32 spi, u8 proto, unsigned short family)
74 {
75 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
76 }
77
78 static void xfrm_hash_transfer(struct hlist_head *list,
79 struct hlist_head *ndsttable,
80 struct hlist_head *nsrctable,
81 struct hlist_head *nspitable,
82 unsigned int nhashmask)
83 {
84 struct hlist_node *tmp;
85 struct xfrm_state *x;
86
87 hlist_for_each_entry_safe(x, tmp, list, bydst) {
88 unsigned int h;
89
90 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
91 x->props.reqid, x->props.family,
92 nhashmask);
93 hlist_add_head_rcu(&x->bydst, ndsttable + h);
94
95 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
96 x->props.family,
97 nhashmask);
98 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
99
100 if (x->id.spi) {
101 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
102 x->id.proto, x->props.family,
103 nhashmask);
104 hlist_add_head_rcu(&x->byspi, nspitable + h);
105 }
106 }
107 }
108
109 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
110 {
111 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
112 }
113
114 static void xfrm_hash_resize(struct work_struct *work)
115 {
116 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
117 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
118 unsigned long nsize, osize;
119 unsigned int nhashmask, ohashmask;
120 int i;
121
122 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
123 ndst = xfrm_hash_alloc(nsize);
124 if (!ndst)
125 return;
126 nsrc = xfrm_hash_alloc(nsize);
127 if (!nsrc) {
128 xfrm_hash_free(ndst, nsize);
129 return;
130 }
131 nspi = xfrm_hash_alloc(nsize);
132 if (!nspi) {
133 xfrm_hash_free(ndst, nsize);
134 xfrm_hash_free(nsrc, nsize);
135 return;
136 }
137
138 spin_lock_bh(&net->xfrm.xfrm_state_lock);
139 write_seqcount_begin(&xfrm_state_hash_generation);
140
141 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
142 odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
143 for (i = net->xfrm.state_hmask; i >= 0; i--)
144 xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nhashmask);
145
146 osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
147 ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
148 ohashmask = net->xfrm.state_hmask;
149
150 rcu_assign_pointer(net->xfrm.state_bydst, ndst);
151 rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
152 rcu_assign_pointer(net->xfrm.state_byspi, nspi);
153 net->xfrm.state_hmask = nhashmask;
154
155 write_seqcount_end(&xfrm_state_hash_generation);
156 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
157
158 osize = (ohashmask + 1) * sizeof(struct hlist_head);
159
160 synchronize_rcu();
161
162 xfrm_hash_free(odst, osize);
163 xfrm_hash_free(osrc, osize);
164 xfrm_hash_free(ospi, osize);
165 }
166
167 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
168 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
169
170 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
171
172 int __xfrm_state_delete(struct xfrm_state *x);
173
174 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
175 bool km_is_alive(const struct km_event *c);
176 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
177
178 static DEFINE_SPINLOCK(xfrm_type_lock);
179 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
180 {
181 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
182 const struct xfrm_type **typemap;
183 int err = 0;
184
185 if (unlikely(afinfo == NULL))
186 return -EAFNOSUPPORT;
187 typemap = afinfo->type_map;
188 spin_lock_bh(&xfrm_type_lock);
189
190 if (likely(typemap[type->proto] == NULL))
191 typemap[type->proto] = type;
192 else
193 err = -EEXIST;
194 spin_unlock_bh(&xfrm_type_lock);
195 rcu_read_unlock();
196 return err;
197 }
198 EXPORT_SYMBOL(xfrm_register_type);
199
200 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
201 {
202 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
203 const struct xfrm_type **typemap;
204 int err = 0;
205
206 if (unlikely(afinfo == NULL))
207 return -EAFNOSUPPORT;
208 typemap = afinfo->type_map;
209 spin_lock_bh(&xfrm_type_lock);
210
211 if (unlikely(typemap[type->proto] != type))
212 err = -ENOENT;
213 else
214 typemap[type->proto] = NULL;
215 spin_unlock_bh(&xfrm_type_lock);
216 rcu_read_unlock();
217 return err;
218 }
219 EXPORT_SYMBOL(xfrm_unregister_type);
220
221 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
222 {
223 struct xfrm_state_afinfo *afinfo;
224 const struct xfrm_type **typemap;
225 const struct xfrm_type *type;
226 int modload_attempted = 0;
227
228 retry:
229 afinfo = xfrm_state_get_afinfo(family);
230 if (unlikely(afinfo == NULL))
231 return NULL;
232 typemap = afinfo->type_map;
233
234 type = READ_ONCE(typemap[proto]);
235 if (unlikely(type && !try_module_get(type->owner)))
236 type = NULL;
237
238 rcu_read_unlock();
239
240 if (!type && !modload_attempted) {
241 request_module("xfrm-type-%d-%d", family, proto);
242 modload_attempted = 1;
243 goto retry;
244 }
245
246 return type;
247 }
248
249 static void xfrm_put_type(const struct xfrm_type *type)
250 {
251 module_put(type->owner);
252 }
253
254 static DEFINE_SPINLOCK(xfrm_type_offload_lock);
255 int xfrm_register_type_offload(const struct xfrm_type_offload *type,
256 unsigned short family)
257 {
258 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
259 const struct xfrm_type_offload **typemap;
260 int err = 0;
261
262 if (unlikely(afinfo == NULL))
263 return -EAFNOSUPPORT;
264 typemap = afinfo->type_offload_map;
265 spin_lock_bh(&xfrm_type_offload_lock);
266
267 if (likely(typemap[type->proto] == NULL))
268 typemap[type->proto] = type;
269 else
270 err = -EEXIST;
271 spin_unlock_bh(&xfrm_type_offload_lock);
272 rcu_read_unlock();
273 return err;
274 }
275 EXPORT_SYMBOL(xfrm_register_type_offload);
276
277 int xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
278 unsigned short family)
279 {
280 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
281 const struct xfrm_type_offload **typemap;
282 int err = 0;
283
284 if (unlikely(afinfo == NULL))
285 return -EAFNOSUPPORT;
286 typemap = afinfo->type_offload_map;
287 spin_lock_bh(&xfrm_type_offload_lock);
288
289 if (unlikely(typemap[type->proto] != type))
290 err = -ENOENT;
291 else
292 typemap[type->proto] = NULL;
293 spin_unlock_bh(&xfrm_type_offload_lock);
294 rcu_read_unlock();
295 return err;
296 }
297 EXPORT_SYMBOL(xfrm_unregister_type_offload);
298
299 static const struct xfrm_type_offload *xfrm_get_type_offload(u8 proto, unsigned short family)
300 {
301 struct xfrm_state_afinfo *afinfo;
302 const struct xfrm_type_offload **typemap;
303 const struct xfrm_type_offload *type;
304
305 afinfo = xfrm_state_get_afinfo(family);
306 if (unlikely(afinfo == NULL))
307 return NULL;
308 typemap = afinfo->type_offload_map;
309
310 type = typemap[proto];
311 if ((type && !try_module_get(type->owner)))
312 type = NULL;
313
314 rcu_read_unlock();
315 return type;
316 }
317
318 static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
319 {
320 module_put(type->owner);
321 }
322
323 static DEFINE_SPINLOCK(xfrm_mode_lock);
324 int xfrm_register_mode(struct xfrm_mode *mode, int family)
325 {
326 struct xfrm_state_afinfo *afinfo;
327 struct xfrm_mode **modemap;
328 int err;
329
330 if (unlikely(mode->encap >= XFRM_MODE_MAX))
331 return -EINVAL;
332
333 afinfo = xfrm_state_get_afinfo(family);
334 if (unlikely(afinfo == NULL))
335 return -EAFNOSUPPORT;
336
337 err = -EEXIST;
338 modemap = afinfo->mode_map;
339 spin_lock_bh(&xfrm_mode_lock);
340 if (modemap[mode->encap])
341 goto out;
342
343 err = -ENOENT;
344 if (!try_module_get(afinfo->owner))
345 goto out;
346
347 mode->afinfo = afinfo;
348 modemap[mode->encap] = mode;
349 err = 0;
350
351 out:
352 spin_unlock_bh(&xfrm_mode_lock);
353 rcu_read_unlock();
354 return err;
355 }
356 EXPORT_SYMBOL(xfrm_register_mode);
357
358 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
359 {
360 struct xfrm_state_afinfo *afinfo;
361 struct xfrm_mode **modemap;
362 int err;
363
364 if (unlikely(mode->encap >= XFRM_MODE_MAX))
365 return -EINVAL;
366
367 afinfo = xfrm_state_get_afinfo(family);
368 if (unlikely(afinfo == NULL))
369 return -EAFNOSUPPORT;
370
371 err = -ENOENT;
372 modemap = afinfo->mode_map;
373 spin_lock_bh(&xfrm_mode_lock);
374 if (likely(modemap[mode->encap] == mode)) {
375 modemap[mode->encap] = NULL;
376 module_put(mode->afinfo->owner);
377 err = 0;
378 }
379
380 spin_unlock_bh(&xfrm_mode_lock);
381 rcu_read_unlock();
382 return err;
383 }
384 EXPORT_SYMBOL(xfrm_unregister_mode);
385
386 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
387 {
388 struct xfrm_state_afinfo *afinfo;
389 struct xfrm_mode *mode;
390 int modload_attempted = 0;
391
392 if (unlikely(encap >= XFRM_MODE_MAX))
393 return NULL;
394
395 retry:
396 afinfo = xfrm_state_get_afinfo(family);
397 if (unlikely(afinfo == NULL))
398 return NULL;
399
400 mode = READ_ONCE(afinfo->mode_map[encap]);
401 if (unlikely(mode && !try_module_get(mode->owner)))
402 mode = NULL;
403
404 rcu_read_unlock();
405 if (!mode && !modload_attempted) {
406 request_module("xfrm-mode-%d-%d", family, encap);
407 modload_attempted = 1;
408 goto retry;
409 }
410
411 return mode;
412 }
413
414 static void xfrm_put_mode(struct xfrm_mode *mode)
415 {
416 module_put(mode->owner);
417 }
418
419 static void xfrm_state_gc_destroy(struct xfrm_state *x)
420 {
421 tasklet_hrtimer_cancel(&x->mtimer);
422 del_timer_sync(&x->rtimer);
423 kfree(x->aead);
424 kfree(x->aalg);
425 kfree(x->ealg);
426 kfree(x->calg);
427 kfree(x->encap);
428 kfree(x->coaddr);
429 kfree(x->replay_esn);
430 kfree(x->preplay_esn);
431 if (x->inner_mode)
432 xfrm_put_mode(x->inner_mode);
433 if (x->inner_mode_iaf)
434 xfrm_put_mode(x->inner_mode_iaf);
435 if (x->outer_mode)
436 xfrm_put_mode(x->outer_mode);
437 if (x->type_offload)
438 xfrm_put_type_offload(x->type_offload);
439 if (x->type) {
440 x->type->destructor(x);
441 xfrm_put_type(x->type);
442 }
443 xfrm_dev_state_free(x);
444 security_xfrm_state_free(x);
445 kfree(x);
446 }
447
448 static void xfrm_state_gc_task(struct work_struct *work)
449 {
450 struct xfrm_state *x;
451 struct hlist_node *tmp;
452 struct hlist_head gc_list;
453
454 spin_lock_bh(&xfrm_state_gc_lock);
455 hlist_move_list(&xfrm_state_gc_list, &gc_list);
456 spin_unlock_bh(&xfrm_state_gc_lock);
457
458 synchronize_rcu();
459
460 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
461 xfrm_state_gc_destroy(x);
462 }
463
464 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
465 {
466 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
467 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
468 unsigned long now = get_seconds();
469 long next = LONG_MAX;
470 int warn = 0;
471 int err = 0;
472
473 spin_lock(&x->lock);
474 if (x->km.state == XFRM_STATE_DEAD)
475 goto out;
476 if (x->km.state == XFRM_STATE_EXPIRED)
477 goto expired;
478 if (x->lft.hard_add_expires_seconds) {
479 long tmo = x->lft.hard_add_expires_seconds +
480 x->curlft.add_time - now;
481 if (tmo <= 0) {
482 if (x->xflags & XFRM_SOFT_EXPIRE) {
483 /* enter hard expire without soft expire first?!
484 * setting a new date could trigger this.
485 * workaround: fix x->curflt.add_time by below:
486 */
487 x->curlft.add_time = now - x->saved_tmo - 1;
488 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
489 } else
490 goto expired;
491 }
492 if (tmo < next)
493 next = tmo;
494 }
495 if (x->lft.hard_use_expires_seconds) {
496 long tmo = x->lft.hard_use_expires_seconds +
497 (x->curlft.use_time ? : now) - now;
498 if (tmo <= 0)
499 goto expired;
500 if (tmo < next)
501 next = tmo;
502 }
503 if (x->km.dying)
504 goto resched;
505 if (x->lft.soft_add_expires_seconds) {
506 long tmo = x->lft.soft_add_expires_seconds +
507 x->curlft.add_time - now;
508 if (tmo <= 0) {
509 warn = 1;
510 x->xflags &= ~XFRM_SOFT_EXPIRE;
511 } else if (tmo < next) {
512 next = tmo;
513 x->xflags |= XFRM_SOFT_EXPIRE;
514 x->saved_tmo = tmo;
515 }
516 }
517 if (x->lft.soft_use_expires_seconds) {
518 long tmo = x->lft.soft_use_expires_seconds +
519 (x->curlft.use_time ? : now) - now;
520 if (tmo <= 0)
521 warn = 1;
522 else if (tmo < next)
523 next = tmo;
524 }
525
526 x->km.dying = warn;
527 if (warn)
528 km_state_expired(x, 0, 0);
529 resched:
530 if (next != LONG_MAX) {
531 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
532 }
533
534 goto out;
535
536 expired:
537 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
538 x->km.state = XFRM_STATE_EXPIRED;
539
540 err = __xfrm_state_delete(x);
541 if (!err)
542 km_state_expired(x, 1, 0);
543
544 xfrm_audit_state_delete(x, err ? 0 : 1, true);
545
546 out:
547 spin_unlock(&x->lock);
548 return HRTIMER_NORESTART;
549 }
550
551 static void xfrm_replay_timer_handler(unsigned long data);
552
553 struct xfrm_state *xfrm_state_alloc(struct net *net)
554 {
555 struct xfrm_state *x;
556
557 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
558
559 if (x) {
560 write_pnet(&x->xs_net, net);
561 atomic_set(&x->refcnt, 1);
562 atomic_set(&x->tunnel_users, 0);
563 INIT_LIST_HEAD(&x->km.all);
564 INIT_HLIST_NODE(&x->bydst);
565 INIT_HLIST_NODE(&x->bysrc);
566 INIT_HLIST_NODE(&x->byspi);
567 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
568 CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
569 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
570 (unsigned long)x);
571 x->curlft.add_time = get_seconds();
572 x->lft.soft_byte_limit = XFRM_INF;
573 x->lft.soft_packet_limit = XFRM_INF;
574 x->lft.hard_byte_limit = XFRM_INF;
575 x->lft.hard_packet_limit = XFRM_INF;
576 x->replay_maxage = 0;
577 x->replay_maxdiff = 0;
578 x->inner_mode = NULL;
579 x->inner_mode_iaf = NULL;
580 spin_lock_init(&x->lock);
581 }
582 return x;
583 }
584 EXPORT_SYMBOL(xfrm_state_alloc);
585
586 void __xfrm_state_destroy(struct xfrm_state *x)
587 {
588 WARN_ON(x->km.state != XFRM_STATE_DEAD);
589
590 spin_lock_bh(&xfrm_state_gc_lock);
591 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
592 spin_unlock_bh(&xfrm_state_gc_lock);
593 schedule_work(&xfrm_state_gc_work);
594 }
595 EXPORT_SYMBOL(__xfrm_state_destroy);
596
597 int __xfrm_state_delete(struct xfrm_state *x)
598 {
599 struct net *net = xs_net(x);
600 int err = -ESRCH;
601
602 if (x->km.state != XFRM_STATE_DEAD) {
603 x->km.state = XFRM_STATE_DEAD;
604 spin_lock(&net->xfrm.xfrm_state_lock);
605 list_del(&x->km.all);
606 hlist_del_rcu(&x->bydst);
607 hlist_del_rcu(&x->bysrc);
608 if (x->id.spi)
609 hlist_del_rcu(&x->byspi);
610 net->xfrm.state_num--;
611 spin_unlock(&net->xfrm.xfrm_state_lock);
612
613 xfrm_dev_state_delete(x);
614
615 /* All xfrm_state objects are created by xfrm_state_alloc.
616 * The xfrm_state_alloc call gives a reference, and that
617 * is what we are dropping here.
618 */
619 xfrm_state_put(x);
620 err = 0;
621 }
622
623 return err;
624 }
625 EXPORT_SYMBOL(__xfrm_state_delete);
626
627 int xfrm_state_delete(struct xfrm_state *x)
628 {
629 int err;
630
631 spin_lock_bh(&x->lock);
632 err = __xfrm_state_delete(x);
633 spin_unlock_bh(&x->lock);
634
635 return err;
636 }
637 EXPORT_SYMBOL(xfrm_state_delete);
638
639 #ifdef CONFIG_SECURITY_NETWORK_XFRM
640 static inline int
641 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
642 {
643 int i, err = 0;
644
645 for (i = 0; i <= net->xfrm.state_hmask; i++) {
646 struct xfrm_state *x;
647
648 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
649 if (xfrm_id_proto_match(x->id.proto, proto) &&
650 (err = security_xfrm_state_delete(x)) != 0) {
651 xfrm_audit_state_delete(x, 0, task_valid);
652 return err;
653 }
654 }
655 }
656
657 return err;
658 }
659
660 static inline int
661 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
662 {
663 int i, err = 0;
664
665 for (i = 0; i <= net->xfrm.state_hmask; i++) {
666 struct xfrm_state *x;
667 struct xfrm_state_offload *xso;
668
669 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
670 xso = &x->xso;
671
672 if (xso->dev == dev &&
673 (err = security_xfrm_state_delete(x)) != 0) {
674 xfrm_audit_state_delete(x, 0, task_valid);
675 return err;
676 }
677 }
678 }
679
680 return err;
681 }
682 #else
683 static inline int
684 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
685 {
686 return 0;
687 }
688
689 static inline int
690 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
691 {
692 return 0;
693 }
694 #endif
695
696 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid)
697 {
698 int i, err = 0, cnt = 0;
699
700 spin_lock_bh(&net->xfrm.xfrm_state_lock);
701 err = xfrm_state_flush_secctx_check(net, proto, task_valid);
702 if (err)
703 goto out;
704
705 err = -ESRCH;
706 for (i = 0; i <= net->xfrm.state_hmask; i++) {
707 struct xfrm_state *x;
708 restart:
709 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
710 if (!xfrm_state_kern(x) &&
711 xfrm_id_proto_match(x->id.proto, proto)) {
712 xfrm_state_hold(x);
713 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
714
715 err = xfrm_state_delete(x);
716 xfrm_audit_state_delete(x, err ? 0 : 1,
717 task_valid);
718 xfrm_state_put(x);
719 if (!err)
720 cnt++;
721
722 spin_lock_bh(&net->xfrm.xfrm_state_lock);
723 goto restart;
724 }
725 }
726 }
727 if (cnt)
728 err = 0;
729
730 out:
731 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
732 return err;
733 }
734 EXPORT_SYMBOL(xfrm_state_flush);
735
736 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
737 {
738 int i, err = 0, cnt = 0;
739
740 spin_lock_bh(&net->xfrm.xfrm_state_lock);
741 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
742 if (err)
743 goto out;
744
745 err = -ESRCH;
746 for (i = 0; i <= net->xfrm.state_hmask; i++) {
747 struct xfrm_state *x;
748 struct xfrm_state_offload *xso;
749 restart:
750 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
751 xso = &x->xso;
752
753 if (!xfrm_state_kern(x) && xso->dev == dev) {
754 xfrm_state_hold(x);
755 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
756
757 err = xfrm_state_delete(x);
758 xfrm_audit_state_delete(x, err ? 0 : 1,
759 task_valid);
760 xfrm_state_put(x);
761 if (!err)
762 cnt++;
763
764 spin_lock_bh(&net->xfrm.xfrm_state_lock);
765 goto restart;
766 }
767 }
768 }
769 if (cnt)
770 err = 0;
771
772 out:
773 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
774 return err;
775 }
776 EXPORT_SYMBOL(xfrm_dev_state_flush);
777
778 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
779 {
780 spin_lock_bh(&net->xfrm.xfrm_state_lock);
781 si->sadcnt = net->xfrm.state_num;
782 si->sadhcnt = net->xfrm.state_hmask;
783 si->sadhmcnt = xfrm_state_hashmax;
784 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
785 }
786 EXPORT_SYMBOL(xfrm_sad_getinfo);
787
788 static void
789 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
790 const struct xfrm_tmpl *tmpl,
791 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
792 unsigned short family)
793 {
794 struct xfrm_state_afinfo *afinfo = xfrm_state_afinfo_get_rcu(family);
795
796 if (!afinfo)
797 return;
798
799 afinfo->init_tempsel(&x->sel, fl);
800
801 if (family != tmpl->encap_family) {
802 afinfo = xfrm_state_afinfo_get_rcu(tmpl->encap_family);
803 if (!afinfo)
804 return;
805 }
806 afinfo->init_temprop(x, tmpl, daddr, saddr);
807 }
808
809 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
810 const xfrm_address_t *daddr,
811 __be32 spi, u8 proto,
812 unsigned short family)
813 {
814 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
815 struct xfrm_state *x;
816
817 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
818 if (x->props.family != family ||
819 x->id.spi != spi ||
820 x->id.proto != proto ||
821 !xfrm_addr_equal(&x->id.daddr, daddr, family))
822 continue;
823
824 if ((mark & x->mark.m) != x->mark.v)
825 continue;
826 if (!xfrm_state_hold_rcu(x))
827 continue;
828 return x;
829 }
830
831 return NULL;
832 }
833
834 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
835 const xfrm_address_t *daddr,
836 const xfrm_address_t *saddr,
837 u8 proto, unsigned short family)
838 {
839 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
840 struct xfrm_state *x;
841
842 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
843 if (x->props.family != family ||
844 x->id.proto != proto ||
845 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
846 !xfrm_addr_equal(&x->props.saddr, saddr, family))
847 continue;
848
849 if ((mark & x->mark.m) != x->mark.v)
850 continue;
851 if (!xfrm_state_hold_rcu(x))
852 continue;
853 return x;
854 }
855
856 return NULL;
857 }
858
859 static inline struct xfrm_state *
860 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
861 {
862 struct net *net = xs_net(x);
863 u32 mark = x->mark.v & x->mark.m;
864
865 if (use_spi)
866 return __xfrm_state_lookup(net, mark, &x->id.daddr,
867 x->id.spi, x->id.proto, family);
868 else
869 return __xfrm_state_lookup_byaddr(net, mark,
870 &x->id.daddr,
871 &x->props.saddr,
872 x->id.proto, family);
873 }
874
875 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
876 {
877 if (have_hash_collision &&
878 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
879 net->xfrm.state_num > net->xfrm.state_hmask)
880 schedule_work(&net->xfrm.state_hash_work);
881 }
882
883 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
884 const struct flowi *fl, unsigned short family,
885 struct xfrm_state **best, int *acq_in_progress,
886 int *error)
887 {
888 /* Resolution logic:
889 * 1. There is a valid state with matching selector. Done.
890 * 2. Valid state with inappropriate selector. Skip.
891 *
892 * Entering area of "sysdeps".
893 *
894 * 3. If state is not valid, selector is temporary, it selects
895 * only session which triggered previous resolution. Key
896 * manager will do something to install a state with proper
897 * selector.
898 */
899 if (x->km.state == XFRM_STATE_VALID) {
900 if ((x->sel.family &&
901 !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
902 !security_xfrm_state_pol_flow_match(x, pol, fl))
903 return;
904
905 if (!*best ||
906 (*best)->km.dying > x->km.dying ||
907 ((*best)->km.dying == x->km.dying &&
908 (*best)->curlft.add_time < x->curlft.add_time))
909 *best = x;
910 } else if (x->km.state == XFRM_STATE_ACQ) {
911 *acq_in_progress = 1;
912 } else if (x->km.state == XFRM_STATE_ERROR ||
913 x->km.state == XFRM_STATE_EXPIRED) {
914 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
915 security_xfrm_state_pol_flow_match(x, pol, fl))
916 *error = -ESRCH;
917 }
918 }
919
920 struct xfrm_state *
921 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
922 const struct flowi *fl, struct xfrm_tmpl *tmpl,
923 struct xfrm_policy *pol, int *err,
924 unsigned short family)
925 {
926 static xfrm_address_t saddr_wildcard = { };
927 struct net *net = xp_net(pol);
928 unsigned int h, h_wildcard;
929 struct xfrm_state *x, *x0, *to_put;
930 int acquire_in_progress = 0;
931 int error = 0;
932 struct xfrm_state *best = NULL;
933 u32 mark = pol->mark.v & pol->mark.m;
934 unsigned short encap_family = tmpl->encap_family;
935 unsigned int sequence;
936 struct km_event c;
937
938 to_put = NULL;
939
940 sequence = read_seqcount_begin(&xfrm_state_hash_generation);
941
942 rcu_read_lock();
943 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
944 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
945 if (x->props.family == encap_family &&
946 x->props.reqid == tmpl->reqid &&
947 (mark & x->mark.m) == x->mark.v &&
948 !(x->props.flags & XFRM_STATE_WILDRECV) &&
949 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
950 tmpl->mode == x->props.mode &&
951 tmpl->id.proto == x->id.proto &&
952 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
953 xfrm_state_look_at(pol, x, fl, encap_family,
954 &best, &acquire_in_progress, &error);
955 }
956 if (best || acquire_in_progress)
957 goto found;
958
959 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
960 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
961 if (x->props.family == encap_family &&
962 x->props.reqid == tmpl->reqid &&
963 (mark & x->mark.m) == x->mark.v &&
964 !(x->props.flags & XFRM_STATE_WILDRECV) &&
965 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
966 tmpl->mode == x->props.mode &&
967 tmpl->id.proto == x->id.proto &&
968 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
969 xfrm_state_look_at(pol, x, fl, encap_family,
970 &best, &acquire_in_progress, &error);
971 }
972
973 found:
974 x = best;
975 if (!x && !error && !acquire_in_progress) {
976 if (tmpl->id.spi &&
977 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
978 tmpl->id.proto, encap_family)) != NULL) {
979 to_put = x0;
980 error = -EEXIST;
981 goto out;
982 }
983
984 c.net = net;
985 /* If the KMs have no listeners (yet...), avoid allocating an SA
986 * for each and every packet - garbage collection might not
987 * handle the flood.
988 */
989 if (!km_is_alive(&c)) {
990 error = -ESRCH;
991 goto out;
992 }
993
994 x = xfrm_state_alloc(net);
995 if (x == NULL) {
996 error = -ENOMEM;
997 goto out;
998 }
999 /* Initialize temporary state matching only
1000 * to current session. */
1001 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1002 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1003
1004 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1005 if (error) {
1006 x->km.state = XFRM_STATE_DEAD;
1007 to_put = x;
1008 x = NULL;
1009 goto out;
1010 }
1011
1012 if (km_query(x, tmpl, pol) == 0) {
1013 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1014 x->km.state = XFRM_STATE_ACQ;
1015 list_add(&x->km.all, &net->xfrm.state_all);
1016 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1017 h = xfrm_src_hash(net, daddr, saddr, encap_family);
1018 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1019 if (x->id.spi) {
1020 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1021 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1022 }
1023 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1024 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1025 net->xfrm.state_num++;
1026 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1027 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1028 } else {
1029 x->km.state = XFRM_STATE_DEAD;
1030 to_put = x;
1031 x = NULL;
1032 error = -ESRCH;
1033 }
1034 }
1035 out:
1036 if (x) {
1037 if (!xfrm_state_hold_rcu(x)) {
1038 *err = -EAGAIN;
1039 x = NULL;
1040 }
1041 } else {
1042 *err = acquire_in_progress ? -EAGAIN : error;
1043 }
1044 rcu_read_unlock();
1045 if (to_put)
1046 xfrm_state_put(to_put);
1047
1048 if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) {
1049 *err = -EAGAIN;
1050 if (x) {
1051 xfrm_state_put(x);
1052 x = NULL;
1053 }
1054 }
1055
1056 return x;
1057 }
1058
1059 struct xfrm_state *
1060 xfrm_stateonly_find(struct net *net, u32 mark,
1061 xfrm_address_t *daddr, xfrm_address_t *saddr,
1062 unsigned short family, u8 mode, u8 proto, u32 reqid)
1063 {
1064 unsigned int h;
1065 struct xfrm_state *rx = NULL, *x = NULL;
1066
1067 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1068 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1069 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1070 if (x->props.family == family &&
1071 x->props.reqid == reqid &&
1072 (mark & x->mark.m) == x->mark.v &&
1073 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1074 xfrm_state_addr_check(x, daddr, saddr, family) &&
1075 mode == x->props.mode &&
1076 proto == x->id.proto &&
1077 x->km.state == XFRM_STATE_VALID) {
1078 rx = x;
1079 break;
1080 }
1081 }
1082
1083 if (rx)
1084 xfrm_state_hold(rx);
1085 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1086
1087
1088 return rx;
1089 }
1090 EXPORT_SYMBOL(xfrm_stateonly_find);
1091
1092 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1093 unsigned short family)
1094 {
1095 struct xfrm_state *x;
1096 struct xfrm_state_walk *w;
1097
1098 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1099 list_for_each_entry(w, &net->xfrm.state_all, all) {
1100 x = container_of(w, struct xfrm_state, km);
1101 if (x->props.family != family ||
1102 x->id.spi != spi)
1103 continue;
1104
1105 xfrm_state_hold(x);
1106 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1107 return x;
1108 }
1109 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1110 return NULL;
1111 }
1112 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1113
1114 static void __xfrm_state_insert(struct xfrm_state *x)
1115 {
1116 struct net *net = xs_net(x);
1117 unsigned int h;
1118
1119 list_add(&x->km.all, &net->xfrm.state_all);
1120
1121 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1122 x->props.reqid, x->props.family);
1123 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1124
1125 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1126 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1127
1128 if (x->id.spi) {
1129 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1130 x->props.family);
1131
1132 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1133 }
1134
1135 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1136 if (x->replay_maxage)
1137 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1138
1139 net->xfrm.state_num++;
1140
1141 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1142 }
1143
1144 /* net->xfrm.xfrm_state_lock is held */
1145 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1146 {
1147 struct net *net = xs_net(xnew);
1148 unsigned short family = xnew->props.family;
1149 u32 reqid = xnew->props.reqid;
1150 struct xfrm_state *x;
1151 unsigned int h;
1152 u32 mark = xnew->mark.v & xnew->mark.m;
1153
1154 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1155 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1156 if (x->props.family == family &&
1157 x->props.reqid == reqid &&
1158 (mark & x->mark.m) == x->mark.v &&
1159 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1160 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1161 x->genid++;
1162 }
1163 }
1164
1165 void xfrm_state_insert(struct xfrm_state *x)
1166 {
1167 struct net *net = xs_net(x);
1168
1169 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1170 __xfrm_state_bump_genids(x);
1171 __xfrm_state_insert(x);
1172 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1173 }
1174 EXPORT_SYMBOL(xfrm_state_insert);
1175
1176 /* net->xfrm.xfrm_state_lock is held */
1177 static struct xfrm_state *__find_acq_core(struct net *net,
1178 const struct xfrm_mark *m,
1179 unsigned short family, u8 mode,
1180 u32 reqid, u8 proto,
1181 const xfrm_address_t *daddr,
1182 const xfrm_address_t *saddr,
1183 int create)
1184 {
1185 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1186 struct xfrm_state *x;
1187 u32 mark = m->v & m->m;
1188
1189 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1190 if (x->props.reqid != reqid ||
1191 x->props.mode != mode ||
1192 x->props.family != family ||
1193 x->km.state != XFRM_STATE_ACQ ||
1194 x->id.spi != 0 ||
1195 x->id.proto != proto ||
1196 (mark & x->mark.m) != x->mark.v ||
1197 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1198 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1199 continue;
1200
1201 xfrm_state_hold(x);
1202 return x;
1203 }
1204
1205 if (!create)
1206 return NULL;
1207
1208 x = xfrm_state_alloc(net);
1209 if (likely(x)) {
1210 switch (family) {
1211 case AF_INET:
1212 x->sel.daddr.a4 = daddr->a4;
1213 x->sel.saddr.a4 = saddr->a4;
1214 x->sel.prefixlen_d = 32;
1215 x->sel.prefixlen_s = 32;
1216 x->props.saddr.a4 = saddr->a4;
1217 x->id.daddr.a4 = daddr->a4;
1218 break;
1219
1220 case AF_INET6:
1221 x->sel.daddr.in6 = daddr->in6;
1222 x->sel.saddr.in6 = saddr->in6;
1223 x->sel.prefixlen_d = 128;
1224 x->sel.prefixlen_s = 128;
1225 x->props.saddr.in6 = saddr->in6;
1226 x->id.daddr.in6 = daddr->in6;
1227 break;
1228 }
1229
1230 x->km.state = XFRM_STATE_ACQ;
1231 x->id.proto = proto;
1232 x->props.family = family;
1233 x->props.mode = mode;
1234 x->props.reqid = reqid;
1235 x->mark.v = m->v;
1236 x->mark.m = m->m;
1237 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1238 xfrm_state_hold(x);
1239 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1240 list_add(&x->km.all, &net->xfrm.state_all);
1241 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1242 h = xfrm_src_hash(net, daddr, saddr, family);
1243 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1244
1245 net->xfrm.state_num++;
1246
1247 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1248 }
1249
1250 return x;
1251 }
1252
1253 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1254
1255 int xfrm_state_add(struct xfrm_state *x)
1256 {
1257 struct net *net = xs_net(x);
1258 struct xfrm_state *x1, *to_put;
1259 int family;
1260 int err;
1261 u32 mark = x->mark.v & x->mark.m;
1262 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1263
1264 family = x->props.family;
1265
1266 to_put = NULL;
1267
1268 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1269
1270 x1 = __xfrm_state_locate(x, use_spi, family);
1271 if (x1) {
1272 to_put = x1;
1273 x1 = NULL;
1274 err = -EEXIST;
1275 goto out;
1276 }
1277
1278 if (use_spi && x->km.seq) {
1279 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1280 if (x1 && ((x1->id.proto != x->id.proto) ||
1281 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1282 to_put = x1;
1283 x1 = NULL;
1284 }
1285 }
1286
1287 if (use_spi && !x1)
1288 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1289 x->props.reqid, x->id.proto,
1290 &x->id.daddr, &x->props.saddr, 0);
1291
1292 __xfrm_state_bump_genids(x);
1293 __xfrm_state_insert(x);
1294 err = 0;
1295
1296 out:
1297 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1298
1299 if (x1) {
1300 xfrm_state_delete(x1);
1301 xfrm_state_put(x1);
1302 }
1303
1304 if (to_put)
1305 xfrm_state_put(to_put);
1306
1307 return err;
1308 }
1309 EXPORT_SYMBOL(xfrm_state_add);
1310
1311 #ifdef CONFIG_XFRM_MIGRATE
1312 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig)
1313 {
1314 struct net *net = xs_net(orig);
1315 struct xfrm_state *x = xfrm_state_alloc(net);
1316 if (!x)
1317 goto out;
1318
1319 memcpy(&x->id, &orig->id, sizeof(x->id));
1320 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1321 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1322 x->props.mode = orig->props.mode;
1323 x->props.replay_window = orig->props.replay_window;
1324 x->props.reqid = orig->props.reqid;
1325 x->props.family = orig->props.family;
1326 x->props.saddr = orig->props.saddr;
1327
1328 if (orig->aalg) {
1329 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1330 if (!x->aalg)
1331 goto error;
1332 }
1333 x->props.aalgo = orig->props.aalgo;
1334
1335 if (orig->aead) {
1336 x->aead = xfrm_algo_aead_clone(orig->aead);
1337 if (!x->aead)
1338 goto error;
1339 }
1340 if (orig->ealg) {
1341 x->ealg = xfrm_algo_clone(orig->ealg);
1342 if (!x->ealg)
1343 goto error;
1344 }
1345 x->props.ealgo = orig->props.ealgo;
1346
1347 if (orig->calg) {
1348 x->calg = xfrm_algo_clone(orig->calg);
1349 if (!x->calg)
1350 goto error;
1351 }
1352 x->props.calgo = orig->props.calgo;
1353
1354 if (orig->encap) {
1355 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1356 if (!x->encap)
1357 goto error;
1358 }
1359
1360 if (orig->coaddr) {
1361 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1362 GFP_KERNEL);
1363 if (!x->coaddr)
1364 goto error;
1365 }
1366
1367 if (orig->replay_esn) {
1368 if (xfrm_replay_clone(x, orig))
1369 goto error;
1370 }
1371
1372 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1373
1374 if (xfrm_init_state(x) < 0)
1375 goto error;
1376
1377 x->props.flags = orig->props.flags;
1378 x->props.extra_flags = orig->props.extra_flags;
1379
1380 x->tfcpad = orig->tfcpad;
1381 x->replay_maxdiff = orig->replay_maxdiff;
1382 x->replay_maxage = orig->replay_maxage;
1383 x->curlft.add_time = orig->curlft.add_time;
1384 x->km.state = orig->km.state;
1385 x->km.seq = orig->km.seq;
1386 x->replay = orig->replay;
1387 x->preplay = orig->preplay;
1388
1389 return x;
1390
1391 error:
1392 xfrm_state_put(x);
1393 out:
1394 return NULL;
1395 }
1396
1397 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1398 {
1399 unsigned int h;
1400 struct xfrm_state *x = NULL;
1401
1402 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1403
1404 if (m->reqid) {
1405 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1406 m->reqid, m->old_family);
1407 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1408 if (x->props.mode != m->mode ||
1409 x->id.proto != m->proto)
1410 continue;
1411 if (m->reqid && x->props.reqid != m->reqid)
1412 continue;
1413 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1414 m->old_family) ||
1415 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1416 m->old_family))
1417 continue;
1418 xfrm_state_hold(x);
1419 break;
1420 }
1421 } else {
1422 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1423 m->old_family);
1424 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1425 if (x->props.mode != m->mode ||
1426 x->id.proto != m->proto)
1427 continue;
1428 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1429 m->old_family) ||
1430 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1431 m->old_family))
1432 continue;
1433 xfrm_state_hold(x);
1434 break;
1435 }
1436 }
1437
1438 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1439
1440 return x;
1441 }
1442 EXPORT_SYMBOL(xfrm_migrate_state_find);
1443
1444 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1445 struct xfrm_migrate *m)
1446 {
1447 struct xfrm_state *xc;
1448
1449 xc = xfrm_state_clone(x);
1450 if (!xc)
1451 return NULL;
1452
1453 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1454 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1455
1456 /* add state */
1457 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1458 /* a care is needed when the destination address of the
1459 state is to be updated as it is a part of triplet */
1460 xfrm_state_insert(xc);
1461 } else {
1462 if (xfrm_state_add(xc) < 0)
1463 goto error;
1464 }
1465
1466 return xc;
1467 error:
1468 xfrm_state_put(xc);
1469 return NULL;
1470 }
1471 EXPORT_SYMBOL(xfrm_state_migrate);
1472 #endif
1473
1474 int xfrm_state_update(struct xfrm_state *x)
1475 {
1476 struct xfrm_state *x1, *to_put;
1477 int err;
1478 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1479 struct net *net = xs_net(x);
1480
1481 to_put = NULL;
1482
1483 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1484 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1485
1486 err = -ESRCH;
1487 if (!x1)
1488 goto out;
1489
1490 if (xfrm_state_kern(x1)) {
1491 to_put = x1;
1492 err = -EEXIST;
1493 goto out;
1494 }
1495
1496 if (x1->km.state == XFRM_STATE_ACQ) {
1497 __xfrm_state_insert(x);
1498 x = NULL;
1499 }
1500 err = 0;
1501
1502 out:
1503 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1504
1505 if (to_put)
1506 xfrm_state_put(to_put);
1507
1508 if (err)
1509 return err;
1510
1511 if (!x) {
1512 xfrm_state_delete(x1);
1513 xfrm_state_put(x1);
1514 return 0;
1515 }
1516
1517 err = -EINVAL;
1518 spin_lock_bh(&x1->lock);
1519 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1520 if (x->encap && x1->encap)
1521 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1522 if (x->coaddr && x1->coaddr) {
1523 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1524 }
1525 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1526 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1527 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1528 x1->km.dying = 0;
1529
1530 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1531 if (x1->curlft.use_time)
1532 xfrm_state_check_expire(x1);
1533
1534 err = 0;
1535 x->km.state = XFRM_STATE_DEAD;
1536 __xfrm_state_put(x);
1537 }
1538 spin_unlock_bh(&x1->lock);
1539
1540 xfrm_state_put(x1);
1541
1542 return err;
1543 }
1544 EXPORT_SYMBOL(xfrm_state_update);
1545
1546 int xfrm_state_check_expire(struct xfrm_state *x)
1547 {
1548 if (!x->curlft.use_time)
1549 x->curlft.use_time = get_seconds();
1550
1551 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1552 x->curlft.packets >= x->lft.hard_packet_limit) {
1553 x->km.state = XFRM_STATE_EXPIRED;
1554 tasklet_hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL);
1555 return -EINVAL;
1556 }
1557
1558 if (!x->km.dying &&
1559 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1560 x->curlft.packets >= x->lft.soft_packet_limit)) {
1561 x->km.dying = 1;
1562 km_state_expired(x, 0, 0);
1563 }
1564 return 0;
1565 }
1566 EXPORT_SYMBOL(xfrm_state_check_expire);
1567
1568 struct xfrm_state *
1569 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1570 u8 proto, unsigned short family)
1571 {
1572 struct xfrm_state *x;
1573
1574 rcu_read_lock();
1575 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1576 rcu_read_unlock();
1577 return x;
1578 }
1579 EXPORT_SYMBOL(xfrm_state_lookup);
1580
1581 struct xfrm_state *
1582 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1583 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1584 u8 proto, unsigned short family)
1585 {
1586 struct xfrm_state *x;
1587
1588 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1589 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1590 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1591 return x;
1592 }
1593 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1594
1595 struct xfrm_state *
1596 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1597 u8 proto, const xfrm_address_t *daddr,
1598 const xfrm_address_t *saddr, int create, unsigned short family)
1599 {
1600 struct xfrm_state *x;
1601
1602 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1603 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1604 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1605
1606 return x;
1607 }
1608 EXPORT_SYMBOL(xfrm_find_acq);
1609
1610 #ifdef CONFIG_XFRM_SUB_POLICY
1611 int
1612 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1613 unsigned short family, struct net *net)
1614 {
1615 int err = 0;
1616 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1617 if (!afinfo)
1618 return -EAFNOSUPPORT;
1619
1620 spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1621 if (afinfo->tmpl_sort)
1622 err = afinfo->tmpl_sort(dst, src, n);
1623 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1624 rcu_read_unlock();
1625 return err;
1626 }
1627 EXPORT_SYMBOL(xfrm_tmpl_sort);
1628
1629 int
1630 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1631 unsigned short family)
1632 {
1633 int err = 0;
1634 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1635 struct net *net = xs_net(*src);
1636
1637 if (!afinfo)
1638 return -EAFNOSUPPORT;
1639
1640 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1641 if (afinfo->state_sort)
1642 err = afinfo->state_sort(dst, src, n);
1643 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1644 rcu_read_unlock();
1645 return err;
1646 }
1647 EXPORT_SYMBOL(xfrm_state_sort);
1648 #endif
1649
1650 /* Silly enough, but I'm lazy to build resolution list */
1651
1652 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1653 {
1654 int i;
1655
1656 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1657 struct xfrm_state *x;
1658
1659 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1660 if (x->km.seq == seq &&
1661 (mark & x->mark.m) == x->mark.v &&
1662 x->km.state == XFRM_STATE_ACQ) {
1663 xfrm_state_hold(x);
1664 return x;
1665 }
1666 }
1667 }
1668 return NULL;
1669 }
1670
1671 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1672 {
1673 struct xfrm_state *x;
1674
1675 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1676 x = __xfrm_find_acq_byseq(net, mark, seq);
1677 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1678 return x;
1679 }
1680 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1681
1682 u32 xfrm_get_acqseq(void)
1683 {
1684 u32 res;
1685 static atomic_t acqseq;
1686
1687 do {
1688 res = atomic_inc_return(&acqseq);
1689 } while (!res);
1690
1691 return res;
1692 }
1693 EXPORT_SYMBOL(xfrm_get_acqseq);
1694
1695 int verify_spi_info(u8 proto, u32 min, u32 max)
1696 {
1697 switch (proto) {
1698 case IPPROTO_AH:
1699 case IPPROTO_ESP:
1700 break;
1701
1702 case IPPROTO_COMP:
1703 /* IPCOMP spi is 16-bits. */
1704 if (max >= 0x10000)
1705 return -EINVAL;
1706 break;
1707
1708 default:
1709 return -EINVAL;
1710 }
1711
1712 if (min > max)
1713 return -EINVAL;
1714
1715 return 0;
1716 }
1717 EXPORT_SYMBOL(verify_spi_info);
1718
1719 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1720 {
1721 struct net *net = xs_net(x);
1722 unsigned int h;
1723 struct xfrm_state *x0;
1724 int err = -ENOENT;
1725 __be32 minspi = htonl(low);
1726 __be32 maxspi = htonl(high);
1727 u32 mark = x->mark.v & x->mark.m;
1728
1729 spin_lock_bh(&x->lock);
1730 if (x->km.state == XFRM_STATE_DEAD)
1731 goto unlock;
1732
1733 err = 0;
1734 if (x->id.spi)
1735 goto unlock;
1736
1737 err = -ENOENT;
1738
1739 if (minspi == maxspi) {
1740 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1741 if (x0) {
1742 xfrm_state_put(x0);
1743 goto unlock;
1744 }
1745 x->id.spi = minspi;
1746 } else {
1747 u32 spi = 0;
1748 for (h = 0; h < high-low+1; h++) {
1749 spi = low + prandom_u32()%(high-low+1);
1750 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1751 if (x0 == NULL) {
1752 x->id.spi = htonl(spi);
1753 break;
1754 }
1755 xfrm_state_put(x0);
1756 }
1757 }
1758 if (x->id.spi) {
1759 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1760 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1761 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1762 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1763
1764 err = 0;
1765 }
1766
1767 unlock:
1768 spin_unlock_bh(&x->lock);
1769
1770 return err;
1771 }
1772 EXPORT_SYMBOL(xfrm_alloc_spi);
1773
1774 static bool __xfrm_state_filter_match(struct xfrm_state *x,
1775 struct xfrm_address_filter *filter)
1776 {
1777 if (filter) {
1778 if ((filter->family == AF_INET ||
1779 filter->family == AF_INET6) &&
1780 x->props.family != filter->family)
1781 return false;
1782
1783 return addr_match(&x->props.saddr, &filter->saddr,
1784 filter->splen) &&
1785 addr_match(&x->id.daddr, &filter->daddr,
1786 filter->dplen);
1787 }
1788 return true;
1789 }
1790
1791 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1792 int (*func)(struct xfrm_state *, int, void*),
1793 void *data)
1794 {
1795 struct xfrm_state *state;
1796 struct xfrm_state_walk *x;
1797 int err = 0;
1798
1799 if (walk->seq != 0 && list_empty(&walk->all))
1800 return 0;
1801
1802 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1803 if (list_empty(&walk->all))
1804 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1805 else
1806 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
1807 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1808 if (x->state == XFRM_STATE_DEAD)
1809 continue;
1810 state = container_of(x, struct xfrm_state, km);
1811 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1812 continue;
1813 if (!__xfrm_state_filter_match(state, walk->filter))
1814 continue;
1815 err = func(state, walk->seq, data);
1816 if (err) {
1817 list_move_tail(&walk->all, &x->all);
1818 goto out;
1819 }
1820 walk->seq++;
1821 }
1822 if (walk->seq == 0) {
1823 err = -ENOENT;
1824 goto out;
1825 }
1826 list_del_init(&walk->all);
1827 out:
1828 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1829 return err;
1830 }
1831 EXPORT_SYMBOL(xfrm_state_walk);
1832
1833 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1834 struct xfrm_address_filter *filter)
1835 {
1836 INIT_LIST_HEAD(&walk->all);
1837 walk->proto = proto;
1838 walk->state = XFRM_STATE_DEAD;
1839 walk->seq = 0;
1840 walk->filter = filter;
1841 }
1842 EXPORT_SYMBOL(xfrm_state_walk_init);
1843
1844 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1845 {
1846 kfree(walk->filter);
1847
1848 if (list_empty(&walk->all))
1849 return;
1850
1851 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1852 list_del(&walk->all);
1853 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1854 }
1855 EXPORT_SYMBOL(xfrm_state_walk_done);
1856
1857 static void xfrm_replay_timer_handler(unsigned long data)
1858 {
1859 struct xfrm_state *x = (struct xfrm_state *)data;
1860
1861 spin_lock(&x->lock);
1862
1863 if (x->km.state == XFRM_STATE_VALID) {
1864 if (xfrm_aevent_is_on(xs_net(x)))
1865 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1866 else
1867 x->xflags |= XFRM_TIME_DEFER;
1868 }
1869
1870 spin_unlock(&x->lock);
1871 }
1872
1873 static LIST_HEAD(xfrm_km_list);
1874
1875 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1876 {
1877 struct xfrm_mgr *km;
1878
1879 rcu_read_lock();
1880 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1881 if (km->notify_policy)
1882 km->notify_policy(xp, dir, c);
1883 rcu_read_unlock();
1884 }
1885
1886 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1887 {
1888 struct xfrm_mgr *km;
1889 rcu_read_lock();
1890 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1891 if (km->notify)
1892 km->notify(x, c);
1893 rcu_read_unlock();
1894 }
1895
1896 EXPORT_SYMBOL(km_policy_notify);
1897 EXPORT_SYMBOL(km_state_notify);
1898
1899 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1900 {
1901 struct km_event c;
1902
1903 c.data.hard = hard;
1904 c.portid = portid;
1905 c.event = XFRM_MSG_EXPIRE;
1906 km_state_notify(x, &c);
1907 }
1908
1909 EXPORT_SYMBOL(km_state_expired);
1910 /*
1911 * We send to all registered managers regardless of failure
1912 * We are happy with one success
1913 */
1914 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1915 {
1916 int err = -EINVAL, acqret;
1917 struct xfrm_mgr *km;
1918
1919 rcu_read_lock();
1920 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1921 acqret = km->acquire(x, t, pol);
1922 if (!acqret)
1923 err = acqret;
1924 }
1925 rcu_read_unlock();
1926 return err;
1927 }
1928 EXPORT_SYMBOL(km_query);
1929
1930 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1931 {
1932 int err = -EINVAL;
1933 struct xfrm_mgr *km;
1934
1935 rcu_read_lock();
1936 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1937 if (km->new_mapping)
1938 err = km->new_mapping(x, ipaddr, sport);
1939 if (!err)
1940 break;
1941 }
1942 rcu_read_unlock();
1943 return err;
1944 }
1945 EXPORT_SYMBOL(km_new_mapping);
1946
1947 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1948 {
1949 struct km_event c;
1950
1951 c.data.hard = hard;
1952 c.portid = portid;
1953 c.event = XFRM_MSG_POLEXPIRE;
1954 km_policy_notify(pol, dir, &c);
1955 }
1956 EXPORT_SYMBOL(km_policy_expired);
1957
1958 #ifdef CONFIG_XFRM_MIGRATE
1959 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1960 const struct xfrm_migrate *m, int num_migrate,
1961 const struct xfrm_kmaddress *k)
1962 {
1963 int err = -EINVAL;
1964 int ret;
1965 struct xfrm_mgr *km;
1966
1967 rcu_read_lock();
1968 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1969 if (km->migrate) {
1970 ret = km->migrate(sel, dir, type, m, num_migrate, k);
1971 if (!ret)
1972 err = ret;
1973 }
1974 }
1975 rcu_read_unlock();
1976 return err;
1977 }
1978 EXPORT_SYMBOL(km_migrate);
1979 #endif
1980
1981 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1982 {
1983 int err = -EINVAL;
1984 int ret;
1985 struct xfrm_mgr *km;
1986
1987 rcu_read_lock();
1988 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1989 if (km->report) {
1990 ret = km->report(net, proto, sel, addr);
1991 if (!ret)
1992 err = ret;
1993 }
1994 }
1995 rcu_read_unlock();
1996 return err;
1997 }
1998 EXPORT_SYMBOL(km_report);
1999
2000 bool km_is_alive(const struct km_event *c)
2001 {
2002 struct xfrm_mgr *km;
2003 bool is_alive = false;
2004
2005 rcu_read_lock();
2006 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2007 if (km->is_alive && km->is_alive(c)) {
2008 is_alive = true;
2009 break;
2010 }
2011 }
2012 rcu_read_unlock();
2013
2014 return is_alive;
2015 }
2016 EXPORT_SYMBOL(km_is_alive);
2017
2018 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
2019 {
2020 int err;
2021 u8 *data;
2022 struct xfrm_mgr *km;
2023 struct xfrm_policy *pol = NULL;
2024
2025 if (optlen <= 0 || optlen > PAGE_SIZE)
2026 return -EMSGSIZE;
2027
2028 data = kmalloc(optlen, GFP_KERNEL);
2029 if (!data)
2030 return -ENOMEM;
2031
2032 err = -EFAULT;
2033 if (copy_from_user(data, optval, optlen))
2034 goto out;
2035
2036 err = -EINVAL;
2037 rcu_read_lock();
2038 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2039 pol = km->compile_policy(sk, optname, data,
2040 optlen, &err);
2041 if (err >= 0)
2042 break;
2043 }
2044 rcu_read_unlock();
2045
2046 if (err >= 0) {
2047 xfrm_sk_policy_insert(sk, err, pol);
2048 xfrm_pol_put(pol);
2049 err = 0;
2050 }
2051
2052 out:
2053 kfree(data);
2054 return err;
2055 }
2056 EXPORT_SYMBOL(xfrm_user_policy);
2057
2058 static DEFINE_SPINLOCK(xfrm_km_lock);
2059
2060 int xfrm_register_km(struct xfrm_mgr *km)
2061 {
2062 spin_lock_bh(&xfrm_km_lock);
2063 list_add_tail_rcu(&km->list, &xfrm_km_list);
2064 spin_unlock_bh(&xfrm_km_lock);
2065 return 0;
2066 }
2067 EXPORT_SYMBOL(xfrm_register_km);
2068
2069 int xfrm_unregister_km(struct xfrm_mgr *km)
2070 {
2071 spin_lock_bh(&xfrm_km_lock);
2072 list_del_rcu(&km->list);
2073 spin_unlock_bh(&xfrm_km_lock);
2074 synchronize_rcu();
2075 return 0;
2076 }
2077 EXPORT_SYMBOL(xfrm_unregister_km);
2078
2079 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2080 {
2081 int err = 0;
2082
2083 if (WARN_ON(afinfo->family >= NPROTO))
2084 return -EAFNOSUPPORT;
2085
2086 spin_lock_bh(&xfrm_state_afinfo_lock);
2087 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2088 err = -EEXIST;
2089 else
2090 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2091 spin_unlock_bh(&xfrm_state_afinfo_lock);
2092 return err;
2093 }
2094 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2095
2096 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2097 {
2098 int err = 0, family = afinfo->family;
2099
2100 if (WARN_ON(family >= NPROTO))
2101 return -EAFNOSUPPORT;
2102
2103 spin_lock_bh(&xfrm_state_afinfo_lock);
2104 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2105 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2106 err = -EINVAL;
2107 else
2108 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2109 }
2110 spin_unlock_bh(&xfrm_state_afinfo_lock);
2111 synchronize_rcu();
2112 return err;
2113 }
2114 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2115
2116 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2117 {
2118 if (unlikely(family >= NPROTO))
2119 return NULL;
2120
2121 return rcu_dereference(xfrm_state_afinfo[family]);
2122 }
2123
2124 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2125 {
2126 struct xfrm_state_afinfo *afinfo;
2127 if (unlikely(family >= NPROTO))
2128 return NULL;
2129 rcu_read_lock();
2130 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2131 if (unlikely(!afinfo))
2132 rcu_read_unlock();
2133 return afinfo;
2134 }
2135
2136 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
2137 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2138 {
2139 if (x->tunnel) {
2140 struct xfrm_state *t = x->tunnel;
2141
2142 if (atomic_read(&t->tunnel_users) == 2)
2143 xfrm_state_delete(t);
2144 atomic_dec(&t->tunnel_users);
2145 xfrm_state_put(t);
2146 x->tunnel = NULL;
2147 }
2148 }
2149 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2150
2151 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
2152 {
2153 const struct xfrm_type *type = READ_ONCE(x->type);
2154
2155 if (x->km.state == XFRM_STATE_VALID &&
2156 type && type->get_mtu)
2157 return type->get_mtu(x, mtu);
2158
2159 return mtu - x->props.header_len;
2160 }
2161
2162 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
2163 {
2164 struct xfrm_state_afinfo *afinfo;
2165 struct xfrm_mode *inner_mode;
2166 int family = x->props.family;
2167 int err;
2168
2169 err = -EAFNOSUPPORT;
2170 afinfo = xfrm_state_get_afinfo(family);
2171 if (!afinfo)
2172 goto error;
2173
2174 err = 0;
2175 if (afinfo->init_flags)
2176 err = afinfo->init_flags(x);
2177
2178 rcu_read_unlock();
2179
2180 if (err)
2181 goto error;
2182
2183 err = -EPROTONOSUPPORT;
2184
2185 if (x->sel.family != AF_UNSPEC) {
2186 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2187 if (inner_mode == NULL)
2188 goto error;
2189
2190 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2191 family != x->sel.family) {
2192 xfrm_put_mode(inner_mode);
2193 goto error;
2194 }
2195
2196 x->inner_mode = inner_mode;
2197 } else {
2198 struct xfrm_mode *inner_mode_iaf;
2199 int iafamily = AF_INET;
2200
2201 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2202 if (inner_mode == NULL)
2203 goto error;
2204
2205 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2206 xfrm_put_mode(inner_mode);
2207 goto error;
2208 }
2209 x->inner_mode = inner_mode;
2210
2211 if (x->props.family == AF_INET)
2212 iafamily = AF_INET6;
2213
2214 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2215 if (inner_mode_iaf) {
2216 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2217 x->inner_mode_iaf = inner_mode_iaf;
2218 else
2219 xfrm_put_mode(inner_mode_iaf);
2220 }
2221 }
2222
2223 x->type = xfrm_get_type(x->id.proto, family);
2224 if (x->type == NULL)
2225 goto error;
2226
2227 x->type_offload = xfrm_get_type_offload(x->id.proto, family);
2228
2229 err = x->type->init_state(x);
2230 if (err)
2231 goto error;
2232
2233 x->outer_mode = xfrm_get_mode(x->props.mode, family);
2234 if (x->outer_mode == NULL) {
2235 err = -EPROTONOSUPPORT;
2236 goto error;
2237 }
2238
2239 if (init_replay) {
2240 err = xfrm_init_replay(x);
2241 if (err)
2242 goto error;
2243 }
2244
2245 x->km.state = XFRM_STATE_VALID;
2246
2247 error:
2248 return err;
2249 }
2250
2251 EXPORT_SYMBOL(__xfrm_init_state);
2252
2253 int xfrm_init_state(struct xfrm_state *x)
2254 {
2255 return __xfrm_init_state(x, true);
2256 }
2257
2258 EXPORT_SYMBOL(xfrm_init_state);
2259
2260 int __net_init xfrm_state_init(struct net *net)
2261 {
2262 unsigned int sz;
2263
2264 INIT_LIST_HEAD(&net->xfrm.state_all);
2265
2266 sz = sizeof(struct hlist_head) * 8;
2267
2268 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2269 if (!net->xfrm.state_bydst)
2270 goto out_bydst;
2271 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2272 if (!net->xfrm.state_bysrc)
2273 goto out_bysrc;
2274 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2275 if (!net->xfrm.state_byspi)
2276 goto out_byspi;
2277 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2278
2279 net->xfrm.state_num = 0;
2280 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2281 spin_lock_init(&net->xfrm.xfrm_state_lock);
2282 return 0;
2283
2284 out_byspi:
2285 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2286 out_bysrc:
2287 xfrm_hash_free(net->xfrm.state_bydst, sz);
2288 out_bydst:
2289 return -ENOMEM;
2290 }
2291
2292 void xfrm_state_fini(struct net *net)
2293 {
2294 unsigned int sz;
2295
2296 flush_work(&net->xfrm.state_hash_work);
2297 xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
2298 flush_work(&xfrm_state_gc_work);
2299
2300 WARN_ON(!list_empty(&net->xfrm.state_all));
2301
2302 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2303 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2304 xfrm_hash_free(net->xfrm.state_byspi, sz);
2305 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2306 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2307 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2308 xfrm_hash_free(net->xfrm.state_bydst, sz);
2309 }
2310
2311 #ifdef CONFIG_AUDITSYSCALL
2312 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2313 struct audit_buffer *audit_buf)
2314 {
2315 struct xfrm_sec_ctx *ctx = x->security;
2316 u32 spi = ntohl(x->id.spi);
2317
2318 if (ctx)
2319 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2320 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2321
2322 switch (x->props.family) {
2323 case AF_INET:
2324 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2325 &x->props.saddr.a4, &x->id.daddr.a4);
2326 break;
2327 case AF_INET6:
2328 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2329 x->props.saddr.a6, x->id.daddr.a6);
2330 break;
2331 }
2332
2333 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2334 }
2335
2336 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2337 struct audit_buffer *audit_buf)
2338 {
2339 const struct iphdr *iph4;
2340 const struct ipv6hdr *iph6;
2341
2342 switch (family) {
2343 case AF_INET:
2344 iph4 = ip_hdr(skb);
2345 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2346 &iph4->saddr, &iph4->daddr);
2347 break;
2348 case AF_INET6:
2349 iph6 = ipv6_hdr(skb);
2350 audit_log_format(audit_buf,
2351 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2352 &iph6->saddr, &iph6->daddr,
2353 iph6->flow_lbl[0] & 0x0f,
2354 iph6->flow_lbl[1],
2355 iph6->flow_lbl[2]);
2356 break;
2357 }
2358 }
2359
2360 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2361 {
2362 struct audit_buffer *audit_buf;
2363
2364 audit_buf = xfrm_audit_start("SAD-add");
2365 if (audit_buf == NULL)
2366 return;
2367 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2368 xfrm_audit_helper_sainfo(x, audit_buf);
2369 audit_log_format(audit_buf, " res=%u", result);
2370 audit_log_end(audit_buf);
2371 }
2372 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2373
2374 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2375 {
2376 struct audit_buffer *audit_buf;
2377
2378 audit_buf = xfrm_audit_start("SAD-delete");
2379 if (audit_buf == NULL)
2380 return;
2381 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2382 xfrm_audit_helper_sainfo(x, audit_buf);
2383 audit_log_format(audit_buf, " res=%u", result);
2384 audit_log_end(audit_buf);
2385 }
2386 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2387
2388 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2389 struct sk_buff *skb)
2390 {
2391 struct audit_buffer *audit_buf;
2392 u32 spi;
2393
2394 audit_buf = xfrm_audit_start("SA-replay-overflow");
2395 if (audit_buf == NULL)
2396 return;
2397 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2398 /* don't record the sequence number because it's inherent in this kind
2399 * of audit message */
2400 spi = ntohl(x->id.spi);
2401 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2402 audit_log_end(audit_buf);
2403 }
2404 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2405
2406 void xfrm_audit_state_replay(struct xfrm_state *x,
2407 struct sk_buff *skb, __be32 net_seq)
2408 {
2409 struct audit_buffer *audit_buf;
2410 u32 spi;
2411
2412 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2413 if (audit_buf == NULL)
2414 return;
2415 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2416 spi = ntohl(x->id.spi);
2417 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2418 spi, spi, ntohl(net_seq));
2419 audit_log_end(audit_buf);
2420 }
2421 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2422
2423 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2424 {
2425 struct audit_buffer *audit_buf;
2426
2427 audit_buf = xfrm_audit_start("SA-notfound");
2428 if (audit_buf == NULL)
2429 return;
2430 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2431 audit_log_end(audit_buf);
2432 }
2433 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2434
2435 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2436 __be32 net_spi, __be32 net_seq)
2437 {
2438 struct audit_buffer *audit_buf;
2439 u32 spi;
2440
2441 audit_buf = xfrm_audit_start("SA-notfound");
2442 if (audit_buf == NULL)
2443 return;
2444 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2445 spi = ntohl(net_spi);
2446 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2447 spi, spi, ntohl(net_seq));
2448 audit_log_end(audit_buf);
2449 }
2450 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2451
2452 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2453 struct sk_buff *skb, u8 proto)
2454 {
2455 struct audit_buffer *audit_buf;
2456 __be32 net_spi;
2457 __be32 net_seq;
2458
2459 audit_buf = xfrm_audit_start("SA-icv-failure");
2460 if (audit_buf == NULL)
2461 return;
2462 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2463 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2464 u32 spi = ntohl(net_spi);
2465 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2466 spi, spi, ntohl(net_seq));
2467 }
2468 audit_log_end(audit_buf);
2469 }
2470 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2471 #endif /* CONFIG_AUDITSYSCALL */
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