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xfrm_user: prevent leaking 2 bytes of kernel memory
[mirror_ubuntu-bionic-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 refcount_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 *
300 xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
301 {
302 struct xfrm_state_afinfo *afinfo;
303 const struct xfrm_type_offload **typemap;
304 const struct xfrm_type_offload *type;
305
306 retry:
307 afinfo = xfrm_state_get_afinfo(family);
308 if (unlikely(afinfo == NULL))
309 return NULL;
310 typemap = afinfo->type_offload_map;
311
312 type = typemap[proto];
313 if ((type && !try_module_get(type->owner)))
314 type = NULL;
315
316 rcu_read_unlock();
317
318 if (!type && try_load) {
319 request_module("xfrm-offload-%d-%d", family, proto);
320 try_load = false;
321 goto retry;
322 }
323
324 return type;
325 }
326
327 static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
328 {
329 module_put(type->owner);
330 }
331
332 static DEFINE_SPINLOCK(xfrm_mode_lock);
333 int xfrm_register_mode(struct xfrm_mode *mode, int family)
334 {
335 struct xfrm_state_afinfo *afinfo;
336 struct xfrm_mode **modemap;
337 int err;
338
339 if (unlikely(mode->encap >= XFRM_MODE_MAX))
340 return -EINVAL;
341
342 afinfo = xfrm_state_get_afinfo(family);
343 if (unlikely(afinfo == NULL))
344 return -EAFNOSUPPORT;
345
346 err = -EEXIST;
347 modemap = afinfo->mode_map;
348 spin_lock_bh(&xfrm_mode_lock);
349 if (modemap[mode->encap])
350 goto out;
351
352 err = -ENOENT;
353 if (!try_module_get(afinfo->owner))
354 goto out;
355
356 mode->afinfo = afinfo;
357 modemap[mode->encap] = mode;
358 err = 0;
359
360 out:
361 spin_unlock_bh(&xfrm_mode_lock);
362 rcu_read_unlock();
363 return err;
364 }
365 EXPORT_SYMBOL(xfrm_register_mode);
366
367 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
368 {
369 struct xfrm_state_afinfo *afinfo;
370 struct xfrm_mode **modemap;
371 int err;
372
373 if (unlikely(mode->encap >= XFRM_MODE_MAX))
374 return -EINVAL;
375
376 afinfo = xfrm_state_get_afinfo(family);
377 if (unlikely(afinfo == NULL))
378 return -EAFNOSUPPORT;
379
380 err = -ENOENT;
381 modemap = afinfo->mode_map;
382 spin_lock_bh(&xfrm_mode_lock);
383 if (likely(modemap[mode->encap] == mode)) {
384 modemap[mode->encap] = NULL;
385 module_put(mode->afinfo->owner);
386 err = 0;
387 }
388
389 spin_unlock_bh(&xfrm_mode_lock);
390 rcu_read_unlock();
391 return err;
392 }
393 EXPORT_SYMBOL(xfrm_unregister_mode);
394
395 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
396 {
397 struct xfrm_state_afinfo *afinfo;
398 struct xfrm_mode *mode;
399 int modload_attempted = 0;
400
401 if (unlikely(encap >= XFRM_MODE_MAX))
402 return NULL;
403
404 retry:
405 afinfo = xfrm_state_get_afinfo(family);
406 if (unlikely(afinfo == NULL))
407 return NULL;
408
409 mode = READ_ONCE(afinfo->mode_map[encap]);
410 if (unlikely(mode && !try_module_get(mode->owner)))
411 mode = NULL;
412
413 rcu_read_unlock();
414 if (!mode && !modload_attempted) {
415 request_module("xfrm-mode-%d-%d", family, encap);
416 modload_attempted = 1;
417 goto retry;
418 }
419
420 return mode;
421 }
422
423 static void xfrm_put_mode(struct xfrm_mode *mode)
424 {
425 module_put(mode->owner);
426 }
427
428 static void xfrm_state_gc_destroy(struct xfrm_state *x)
429 {
430 tasklet_hrtimer_cancel(&x->mtimer);
431 del_timer_sync(&x->rtimer);
432 kfree(x->aead);
433 kfree(x->aalg);
434 kfree(x->ealg);
435 kfree(x->calg);
436 kfree(x->encap);
437 kfree(x->coaddr);
438 kfree(x->replay_esn);
439 kfree(x->preplay_esn);
440 if (x->inner_mode)
441 xfrm_put_mode(x->inner_mode);
442 if (x->inner_mode_iaf)
443 xfrm_put_mode(x->inner_mode_iaf);
444 if (x->outer_mode)
445 xfrm_put_mode(x->outer_mode);
446 if (x->type_offload)
447 xfrm_put_type_offload(x->type_offload);
448 if (x->type) {
449 x->type->destructor(x);
450 xfrm_put_type(x->type);
451 }
452 xfrm_dev_state_free(x);
453 security_xfrm_state_free(x);
454 kfree(x);
455 }
456
457 static void xfrm_state_gc_task(struct work_struct *work)
458 {
459 struct xfrm_state *x;
460 struct hlist_node *tmp;
461 struct hlist_head gc_list;
462
463 spin_lock_bh(&xfrm_state_gc_lock);
464 hlist_move_list(&xfrm_state_gc_list, &gc_list);
465 spin_unlock_bh(&xfrm_state_gc_lock);
466
467 synchronize_rcu();
468
469 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
470 xfrm_state_gc_destroy(x);
471 }
472
473 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
474 {
475 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
476 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
477 unsigned long now = get_seconds();
478 long next = LONG_MAX;
479 int warn = 0;
480 int err = 0;
481
482 spin_lock(&x->lock);
483 if (x->km.state == XFRM_STATE_DEAD)
484 goto out;
485 if (x->km.state == XFRM_STATE_EXPIRED)
486 goto expired;
487 if (x->lft.hard_add_expires_seconds) {
488 long tmo = x->lft.hard_add_expires_seconds +
489 x->curlft.add_time - now;
490 if (tmo <= 0) {
491 if (x->xflags & XFRM_SOFT_EXPIRE) {
492 /* enter hard expire without soft expire first?!
493 * setting a new date could trigger this.
494 * workaround: fix x->curflt.add_time by below:
495 */
496 x->curlft.add_time = now - x->saved_tmo - 1;
497 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
498 } else
499 goto expired;
500 }
501 if (tmo < next)
502 next = tmo;
503 }
504 if (x->lft.hard_use_expires_seconds) {
505 long tmo = x->lft.hard_use_expires_seconds +
506 (x->curlft.use_time ? : now) - now;
507 if (tmo <= 0)
508 goto expired;
509 if (tmo < next)
510 next = tmo;
511 }
512 if (x->km.dying)
513 goto resched;
514 if (x->lft.soft_add_expires_seconds) {
515 long tmo = x->lft.soft_add_expires_seconds +
516 x->curlft.add_time - now;
517 if (tmo <= 0) {
518 warn = 1;
519 x->xflags &= ~XFRM_SOFT_EXPIRE;
520 } else if (tmo < next) {
521 next = tmo;
522 x->xflags |= XFRM_SOFT_EXPIRE;
523 x->saved_tmo = tmo;
524 }
525 }
526 if (x->lft.soft_use_expires_seconds) {
527 long tmo = x->lft.soft_use_expires_seconds +
528 (x->curlft.use_time ? : now) - now;
529 if (tmo <= 0)
530 warn = 1;
531 else if (tmo < next)
532 next = tmo;
533 }
534
535 x->km.dying = warn;
536 if (warn)
537 km_state_expired(x, 0, 0);
538 resched:
539 if (next != LONG_MAX) {
540 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
541 }
542
543 goto out;
544
545 expired:
546 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
547 x->km.state = XFRM_STATE_EXPIRED;
548
549 err = __xfrm_state_delete(x);
550 if (!err)
551 km_state_expired(x, 1, 0);
552
553 xfrm_audit_state_delete(x, err ? 0 : 1, true);
554
555 out:
556 spin_unlock(&x->lock);
557 return HRTIMER_NORESTART;
558 }
559
560 static void xfrm_replay_timer_handler(struct timer_list *t);
561
562 struct xfrm_state *xfrm_state_alloc(struct net *net)
563 {
564 struct xfrm_state *x;
565
566 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
567
568 if (x) {
569 write_pnet(&x->xs_net, net);
570 refcount_set(&x->refcnt, 1);
571 atomic_set(&x->tunnel_users, 0);
572 INIT_LIST_HEAD(&x->km.all);
573 INIT_HLIST_NODE(&x->bydst);
574 INIT_HLIST_NODE(&x->bysrc);
575 INIT_HLIST_NODE(&x->byspi);
576 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
577 CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
578 timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
579 x->curlft.add_time = get_seconds();
580 x->lft.soft_byte_limit = XFRM_INF;
581 x->lft.soft_packet_limit = XFRM_INF;
582 x->lft.hard_byte_limit = XFRM_INF;
583 x->lft.hard_packet_limit = XFRM_INF;
584 x->replay_maxage = 0;
585 x->replay_maxdiff = 0;
586 x->inner_mode = NULL;
587 x->inner_mode_iaf = NULL;
588 spin_lock_init(&x->lock);
589 }
590 return x;
591 }
592 EXPORT_SYMBOL(xfrm_state_alloc);
593
594 void __xfrm_state_destroy(struct xfrm_state *x)
595 {
596 WARN_ON(x->km.state != XFRM_STATE_DEAD);
597
598 spin_lock_bh(&xfrm_state_gc_lock);
599 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
600 spin_unlock_bh(&xfrm_state_gc_lock);
601 schedule_work(&xfrm_state_gc_work);
602 }
603 EXPORT_SYMBOL(__xfrm_state_destroy);
604
605 int __xfrm_state_delete(struct xfrm_state *x)
606 {
607 struct net *net = xs_net(x);
608 int err = -ESRCH;
609
610 if (x->km.state != XFRM_STATE_DEAD) {
611 x->km.state = XFRM_STATE_DEAD;
612 spin_lock(&net->xfrm.xfrm_state_lock);
613 list_del(&x->km.all);
614 hlist_del_rcu(&x->bydst);
615 hlist_del_rcu(&x->bysrc);
616 if (x->id.spi)
617 hlist_del_rcu(&x->byspi);
618 net->xfrm.state_num--;
619 spin_unlock(&net->xfrm.xfrm_state_lock);
620
621 xfrm_dev_state_delete(x);
622
623 /* All xfrm_state objects are created by xfrm_state_alloc.
624 * The xfrm_state_alloc call gives a reference, and that
625 * is what we are dropping here.
626 */
627 xfrm_state_put(x);
628 err = 0;
629 }
630
631 return err;
632 }
633 EXPORT_SYMBOL(__xfrm_state_delete);
634
635 int xfrm_state_delete(struct xfrm_state *x)
636 {
637 int err;
638
639 spin_lock_bh(&x->lock);
640 err = __xfrm_state_delete(x);
641 spin_unlock_bh(&x->lock);
642
643 return err;
644 }
645 EXPORT_SYMBOL(xfrm_state_delete);
646
647 #ifdef CONFIG_SECURITY_NETWORK_XFRM
648 static inline int
649 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
650 {
651 int i, err = 0;
652
653 for (i = 0; i <= net->xfrm.state_hmask; i++) {
654 struct xfrm_state *x;
655
656 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
657 if (xfrm_id_proto_match(x->id.proto, proto) &&
658 (err = security_xfrm_state_delete(x)) != 0) {
659 xfrm_audit_state_delete(x, 0, task_valid);
660 return err;
661 }
662 }
663 }
664
665 return err;
666 }
667
668 static inline int
669 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
670 {
671 int i, err = 0;
672
673 for (i = 0; i <= net->xfrm.state_hmask; i++) {
674 struct xfrm_state *x;
675 struct xfrm_state_offload *xso;
676
677 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
678 xso = &x->xso;
679
680 if (xso->dev == dev &&
681 (err = security_xfrm_state_delete(x)) != 0) {
682 xfrm_audit_state_delete(x, 0, task_valid);
683 return err;
684 }
685 }
686 }
687
688 return err;
689 }
690 #else
691 static inline int
692 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
693 {
694 return 0;
695 }
696
697 static inline int
698 xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
699 {
700 return 0;
701 }
702 #endif
703
704 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid)
705 {
706 int i, err = 0, cnt = 0;
707
708 spin_lock_bh(&net->xfrm.xfrm_state_lock);
709 err = xfrm_state_flush_secctx_check(net, proto, task_valid);
710 if (err)
711 goto out;
712
713 err = -ESRCH;
714 for (i = 0; i <= net->xfrm.state_hmask; i++) {
715 struct xfrm_state *x;
716 restart:
717 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
718 if (!xfrm_state_kern(x) &&
719 xfrm_id_proto_match(x->id.proto, proto)) {
720 xfrm_state_hold(x);
721 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
722
723 err = xfrm_state_delete(x);
724 xfrm_audit_state_delete(x, err ? 0 : 1,
725 task_valid);
726 xfrm_state_put(x);
727 if (!err)
728 cnt++;
729
730 spin_lock_bh(&net->xfrm.xfrm_state_lock);
731 goto restart;
732 }
733 }
734 }
735 out:
736 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
737 if (cnt) {
738 err = 0;
739 xfrm_policy_cache_flush();
740 }
741 return err;
742 }
743 EXPORT_SYMBOL(xfrm_state_flush);
744
745 int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
746 {
747 int i, err = 0, cnt = 0;
748
749 spin_lock_bh(&net->xfrm.xfrm_state_lock);
750 err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
751 if (err)
752 goto out;
753
754 err = -ESRCH;
755 for (i = 0; i <= net->xfrm.state_hmask; i++) {
756 struct xfrm_state *x;
757 struct xfrm_state_offload *xso;
758 restart:
759 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
760 xso = &x->xso;
761
762 if (!xfrm_state_kern(x) && xso->dev == dev) {
763 xfrm_state_hold(x);
764 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
765
766 err = xfrm_state_delete(x);
767 xfrm_audit_state_delete(x, err ? 0 : 1,
768 task_valid);
769 xfrm_state_put(x);
770 if (!err)
771 cnt++;
772
773 spin_lock_bh(&net->xfrm.xfrm_state_lock);
774 goto restart;
775 }
776 }
777 }
778 if (cnt)
779 err = 0;
780
781 out:
782 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
783 return err;
784 }
785 EXPORT_SYMBOL(xfrm_dev_state_flush);
786
787 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
788 {
789 spin_lock_bh(&net->xfrm.xfrm_state_lock);
790 si->sadcnt = net->xfrm.state_num;
791 si->sadhcnt = net->xfrm.state_hmask;
792 si->sadhmcnt = xfrm_state_hashmax;
793 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
794 }
795 EXPORT_SYMBOL(xfrm_sad_getinfo);
796
797 static void
798 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
799 const struct xfrm_tmpl *tmpl,
800 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
801 unsigned short family)
802 {
803 struct xfrm_state_afinfo *afinfo = xfrm_state_afinfo_get_rcu(family);
804
805 if (!afinfo)
806 return;
807
808 afinfo->init_tempsel(&x->sel, fl);
809
810 if (family != tmpl->encap_family) {
811 afinfo = xfrm_state_afinfo_get_rcu(tmpl->encap_family);
812 if (!afinfo)
813 return;
814 }
815 afinfo->init_temprop(x, tmpl, daddr, saddr);
816 }
817
818 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
819 const xfrm_address_t *daddr,
820 __be32 spi, u8 proto,
821 unsigned short family)
822 {
823 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
824 struct xfrm_state *x;
825
826 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
827 if (x->props.family != family ||
828 x->id.spi != spi ||
829 x->id.proto != proto ||
830 !xfrm_addr_equal(&x->id.daddr, daddr, family))
831 continue;
832
833 if ((mark & x->mark.m) != x->mark.v)
834 continue;
835 if (!xfrm_state_hold_rcu(x))
836 continue;
837 return x;
838 }
839
840 return NULL;
841 }
842
843 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
844 const xfrm_address_t *daddr,
845 const xfrm_address_t *saddr,
846 u8 proto, unsigned short family)
847 {
848 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
849 struct xfrm_state *x;
850
851 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
852 if (x->props.family != family ||
853 x->id.proto != proto ||
854 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
855 !xfrm_addr_equal(&x->props.saddr, saddr, family))
856 continue;
857
858 if ((mark & x->mark.m) != x->mark.v)
859 continue;
860 if (!xfrm_state_hold_rcu(x))
861 continue;
862 return x;
863 }
864
865 return NULL;
866 }
867
868 static inline struct xfrm_state *
869 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
870 {
871 struct net *net = xs_net(x);
872 u32 mark = x->mark.v & x->mark.m;
873
874 if (use_spi)
875 return __xfrm_state_lookup(net, mark, &x->id.daddr,
876 x->id.spi, x->id.proto, family);
877 else
878 return __xfrm_state_lookup_byaddr(net, mark,
879 &x->id.daddr,
880 &x->props.saddr,
881 x->id.proto, family);
882 }
883
884 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
885 {
886 if (have_hash_collision &&
887 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
888 net->xfrm.state_num > net->xfrm.state_hmask)
889 schedule_work(&net->xfrm.state_hash_work);
890 }
891
892 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
893 const struct flowi *fl, unsigned short family,
894 struct xfrm_state **best, int *acq_in_progress,
895 int *error)
896 {
897 /* Resolution logic:
898 * 1. There is a valid state with matching selector. Done.
899 * 2. Valid state with inappropriate selector. Skip.
900 *
901 * Entering area of "sysdeps".
902 *
903 * 3. If state is not valid, selector is temporary, it selects
904 * only session which triggered previous resolution. Key
905 * manager will do something to install a state with proper
906 * selector.
907 */
908 if (x->km.state == XFRM_STATE_VALID) {
909 if ((x->sel.family &&
910 !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
911 !security_xfrm_state_pol_flow_match(x, pol, fl))
912 return;
913
914 if (!*best ||
915 (*best)->km.dying > x->km.dying ||
916 ((*best)->km.dying == x->km.dying &&
917 (*best)->curlft.add_time < x->curlft.add_time))
918 *best = x;
919 } else if (x->km.state == XFRM_STATE_ACQ) {
920 *acq_in_progress = 1;
921 } else if (x->km.state == XFRM_STATE_ERROR ||
922 x->km.state == XFRM_STATE_EXPIRED) {
923 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
924 security_xfrm_state_pol_flow_match(x, pol, fl))
925 *error = -ESRCH;
926 }
927 }
928
929 struct xfrm_state *
930 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
931 const struct flowi *fl, struct xfrm_tmpl *tmpl,
932 struct xfrm_policy *pol, int *err,
933 unsigned short family)
934 {
935 static xfrm_address_t saddr_wildcard = { };
936 struct net *net = xp_net(pol);
937 unsigned int h, h_wildcard;
938 struct xfrm_state *x, *x0, *to_put;
939 int acquire_in_progress = 0;
940 int error = 0;
941 struct xfrm_state *best = NULL;
942 u32 mark = pol->mark.v & pol->mark.m;
943 unsigned short encap_family = tmpl->encap_family;
944 unsigned int sequence;
945 struct km_event c;
946
947 to_put = NULL;
948
949 sequence = read_seqcount_begin(&xfrm_state_hash_generation);
950
951 rcu_read_lock();
952 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
953 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
954 if (x->props.family == encap_family &&
955 x->props.reqid == tmpl->reqid &&
956 (mark & x->mark.m) == x->mark.v &&
957 !(x->props.flags & XFRM_STATE_WILDRECV) &&
958 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
959 tmpl->mode == x->props.mode &&
960 tmpl->id.proto == x->id.proto &&
961 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
962 xfrm_state_look_at(pol, x, fl, encap_family,
963 &best, &acquire_in_progress, &error);
964 }
965 if (best || acquire_in_progress)
966 goto found;
967
968 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
969 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
970 if (x->props.family == encap_family &&
971 x->props.reqid == tmpl->reqid &&
972 (mark & x->mark.m) == x->mark.v &&
973 !(x->props.flags & XFRM_STATE_WILDRECV) &&
974 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
975 tmpl->mode == x->props.mode &&
976 tmpl->id.proto == x->id.proto &&
977 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
978 xfrm_state_look_at(pol, x, fl, encap_family,
979 &best, &acquire_in_progress, &error);
980 }
981
982 found:
983 x = best;
984 if (!x && !error && !acquire_in_progress) {
985 if (tmpl->id.spi &&
986 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
987 tmpl->id.proto, encap_family)) != NULL) {
988 to_put = x0;
989 error = -EEXIST;
990 goto out;
991 }
992
993 c.net = net;
994 /* If the KMs have no listeners (yet...), avoid allocating an SA
995 * for each and every packet - garbage collection might not
996 * handle the flood.
997 */
998 if (!km_is_alive(&c)) {
999 error = -ESRCH;
1000 goto out;
1001 }
1002
1003 x = xfrm_state_alloc(net);
1004 if (x == NULL) {
1005 error = -ENOMEM;
1006 goto out;
1007 }
1008 /* Initialize temporary state matching only
1009 * to current session. */
1010 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
1011 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
1012
1013 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
1014 if (error) {
1015 x->km.state = XFRM_STATE_DEAD;
1016 to_put = x;
1017 x = NULL;
1018 goto out;
1019 }
1020
1021 if (km_query(x, tmpl, pol) == 0) {
1022 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1023 x->km.state = XFRM_STATE_ACQ;
1024 list_add(&x->km.all, &net->xfrm.state_all);
1025 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1026 h = xfrm_src_hash(net, daddr, saddr, encap_family);
1027 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1028 if (x->id.spi) {
1029 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
1030 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1031 }
1032 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1033 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1034 net->xfrm.state_num++;
1035 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1036 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1037 } else {
1038 x->km.state = XFRM_STATE_DEAD;
1039 to_put = x;
1040 x = NULL;
1041 error = -ESRCH;
1042 }
1043 }
1044 out:
1045 if (x) {
1046 if (!xfrm_state_hold_rcu(x)) {
1047 *err = -EAGAIN;
1048 x = NULL;
1049 }
1050 } else {
1051 *err = acquire_in_progress ? -EAGAIN : error;
1052 }
1053 rcu_read_unlock();
1054 if (to_put)
1055 xfrm_state_put(to_put);
1056
1057 if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) {
1058 *err = -EAGAIN;
1059 if (x) {
1060 xfrm_state_put(x);
1061 x = NULL;
1062 }
1063 }
1064
1065 return x;
1066 }
1067
1068 struct xfrm_state *
1069 xfrm_stateonly_find(struct net *net, u32 mark,
1070 xfrm_address_t *daddr, xfrm_address_t *saddr,
1071 unsigned short family, u8 mode, u8 proto, u32 reqid)
1072 {
1073 unsigned int h;
1074 struct xfrm_state *rx = NULL, *x = NULL;
1075
1076 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1077 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1078 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1079 if (x->props.family == family &&
1080 x->props.reqid == reqid &&
1081 (mark & x->mark.m) == x->mark.v &&
1082 !(x->props.flags & XFRM_STATE_WILDRECV) &&
1083 xfrm_state_addr_check(x, daddr, saddr, family) &&
1084 mode == x->props.mode &&
1085 proto == x->id.proto &&
1086 x->km.state == XFRM_STATE_VALID) {
1087 rx = x;
1088 break;
1089 }
1090 }
1091
1092 if (rx)
1093 xfrm_state_hold(rx);
1094 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1095
1096
1097 return rx;
1098 }
1099 EXPORT_SYMBOL(xfrm_stateonly_find);
1100
1101 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
1102 unsigned short family)
1103 {
1104 struct xfrm_state *x;
1105 struct xfrm_state_walk *w;
1106
1107 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1108 list_for_each_entry(w, &net->xfrm.state_all, all) {
1109 x = container_of(w, struct xfrm_state, km);
1110 if (x->props.family != family ||
1111 x->id.spi != spi)
1112 continue;
1113
1114 xfrm_state_hold(x);
1115 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1116 return x;
1117 }
1118 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1119 return NULL;
1120 }
1121 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
1122
1123 static void __xfrm_state_insert(struct xfrm_state *x)
1124 {
1125 struct net *net = xs_net(x);
1126 unsigned int h;
1127
1128 list_add(&x->km.all, &net->xfrm.state_all);
1129
1130 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
1131 x->props.reqid, x->props.family);
1132 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1133
1134 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
1135 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1136
1137 if (x->id.spi) {
1138 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
1139 x->props.family);
1140
1141 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1142 }
1143
1144 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1145 if (x->replay_maxage)
1146 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1147
1148 net->xfrm.state_num++;
1149
1150 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1151 }
1152
1153 /* net->xfrm.xfrm_state_lock is held */
1154 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1155 {
1156 struct net *net = xs_net(xnew);
1157 unsigned short family = xnew->props.family;
1158 u32 reqid = xnew->props.reqid;
1159 struct xfrm_state *x;
1160 unsigned int h;
1161 u32 mark = xnew->mark.v & xnew->mark.m;
1162
1163 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1164 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1165 if (x->props.family == family &&
1166 x->props.reqid == reqid &&
1167 (mark & x->mark.m) == x->mark.v &&
1168 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1169 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1170 x->genid++;
1171 }
1172 }
1173
1174 void xfrm_state_insert(struct xfrm_state *x)
1175 {
1176 struct net *net = xs_net(x);
1177
1178 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1179 __xfrm_state_bump_genids(x);
1180 __xfrm_state_insert(x);
1181 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1182 }
1183 EXPORT_SYMBOL(xfrm_state_insert);
1184
1185 /* net->xfrm.xfrm_state_lock is held */
1186 static struct xfrm_state *__find_acq_core(struct net *net,
1187 const struct xfrm_mark *m,
1188 unsigned short family, u8 mode,
1189 u32 reqid, u8 proto,
1190 const xfrm_address_t *daddr,
1191 const xfrm_address_t *saddr,
1192 int create)
1193 {
1194 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1195 struct xfrm_state *x;
1196 u32 mark = m->v & m->m;
1197
1198 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1199 if (x->props.reqid != reqid ||
1200 x->props.mode != mode ||
1201 x->props.family != family ||
1202 x->km.state != XFRM_STATE_ACQ ||
1203 x->id.spi != 0 ||
1204 x->id.proto != proto ||
1205 (mark & x->mark.m) != x->mark.v ||
1206 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1207 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1208 continue;
1209
1210 xfrm_state_hold(x);
1211 return x;
1212 }
1213
1214 if (!create)
1215 return NULL;
1216
1217 x = xfrm_state_alloc(net);
1218 if (likely(x)) {
1219 switch (family) {
1220 case AF_INET:
1221 x->sel.daddr.a4 = daddr->a4;
1222 x->sel.saddr.a4 = saddr->a4;
1223 x->sel.prefixlen_d = 32;
1224 x->sel.prefixlen_s = 32;
1225 x->props.saddr.a4 = saddr->a4;
1226 x->id.daddr.a4 = daddr->a4;
1227 break;
1228
1229 case AF_INET6:
1230 x->sel.daddr.in6 = daddr->in6;
1231 x->sel.saddr.in6 = saddr->in6;
1232 x->sel.prefixlen_d = 128;
1233 x->sel.prefixlen_s = 128;
1234 x->props.saddr.in6 = saddr->in6;
1235 x->id.daddr.in6 = daddr->in6;
1236 break;
1237 }
1238
1239 x->km.state = XFRM_STATE_ACQ;
1240 x->id.proto = proto;
1241 x->props.family = family;
1242 x->props.mode = mode;
1243 x->props.reqid = reqid;
1244 x->mark.v = m->v;
1245 x->mark.m = m->m;
1246 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1247 xfrm_state_hold(x);
1248 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1249 list_add(&x->km.all, &net->xfrm.state_all);
1250 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1251 h = xfrm_src_hash(net, daddr, saddr, family);
1252 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1253
1254 net->xfrm.state_num++;
1255
1256 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1257 }
1258
1259 return x;
1260 }
1261
1262 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1263
1264 int xfrm_state_add(struct xfrm_state *x)
1265 {
1266 struct net *net = xs_net(x);
1267 struct xfrm_state *x1, *to_put;
1268 int family;
1269 int err;
1270 u32 mark = x->mark.v & x->mark.m;
1271 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1272
1273 family = x->props.family;
1274
1275 to_put = NULL;
1276
1277 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1278
1279 x1 = __xfrm_state_locate(x, use_spi, family);
1280 if (x1) {
1281 to_put = x1;
1282 x1 = NULL;
1283 err = -EEXIST;
1284 goto out;
1285 }
1286
1287 if (use_spi && x->km.seq) {
1288 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1289 if (x1 && ((x1->id.proto != x->id.proto) ||
1290 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1291 to_put = x1;
1292 x1 = NULL;
1293 }
1294 }
1295
1296 if (use_spi && !x1)
1297 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1298 x->props.reqid, x->id.proto,
1299 &x->id.daddr, &x->props.saddr, 0);
1300
1301 __xfrm_state_bump_genids(x);
1302 __xfrm_state_insert(x);
1303 err = 0;
1304
1305 out:
1306 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1307
1308 if (x1) {
1309 xfrm_state_delete(x1);
1310 xfrm_state_put(x1);
1311 }
1312
1313 if (to_put)
1314 xfrm_state_put(to_put);
1315
1316 return err;
1317 }
1318 EXPORT_SYMBOL(xfrm_state_add);
1319
1320 #ifdef CONFIG_XFRM_MIGRATE
1321 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
1322 struct xfrm_encap_tmpl *encap)
1323 {
1324 struct net *net = xs_net(orig);
1325 struct xfrm_state *x = xfrm_state_alloc(net);
1326 if (!x)
1327 goto out;
1328
1329 memcpy(&x->id, &orig->id, sizeof(x->id));
1330 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1331 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1332 x->props.mode = orig->props.mode;
1333 x->props.replay_window = orig->props.replay_window;
1334 x->props.reqid = orig->props.reqid;
1335 x->props.family = orig->props.family;
1336 x->props.saddr = orig->props.saddr;
1337
1338 if (orig->aalg) {
1339 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1340 if (!x->aalg)
1341 goto error;
1342 }
1343 x->props.aalgo = orig->props.aalgo;
1344
1345 if (orig->aead) {
1346 x->aead = xfrm_algo_aead_clone(orig->aead);
1347 x->geniv = orig->geniv;
1348 if (!x->aead)
1349 goto error;
1350 }
1351 if (orig->ealg) {
1352 x->ealg = xfrm_algo_clone(orig->ealg);
1353 if (!x->ealg)
1354 goto error;
1355 }
1356 x->props.ealgo = orig->props.ealgo;
1357
1358 if (orig->calg) {
1359 x->calg = xfrm_algo_clone(orig->calg);
1360 if (!x->calg)
1361 goto error;
1362 }
1363 x->props.calgo = orig->props.calgo;
1364
1365 if (encap || orig->encap) {
1366 if (encap)
1367 x->encap = kmemdup(encap, sizeof(*x->encap),
1368 GFP_KERNEL);
1369 else
1370 x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1371 GFP_KERNEL);
1372
1373 if (!x->encap)
1374 goto error;
1375 }
1376
1377 if (orig->coaddr) {
1378 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1379 GFP_KERNEL);
1380 if (!x->coaddr)
1381 goto error;
1382 }
1383
1384 if (orig->replay_esn) {
1385 if (xfrm_replay_clone(x, orig))
1386 goto error;
1387 }
1388
1389 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1390
1391 if (xfrm_init_state(x) < 0)
1392 goto error;
1393
1394 x->props.flags = orig->props.flags;
1395 x->props.extra_flags = orig->props.extra_flags;
1396
1397 x->tfcpad = orig->tfcpad;
1398 x->replay_maxdiff = orig->replay_maxdiff;
1399 x->replay_maxage = orig->replay_maxage;
1400 x->curlft.add_time = orig->curlft.add_time;
1401 x->km.state = orig->km.state;
1402 x->km.seq = orig->km.seq;
1403 x->replay = orig->replay;
1404 x->preplay = orig->preplay;
1405
1406 return x;
1407
1408 error:
1409 xfrm_state_put(x);
1410 out:
1411 return NULL;
1412 }
1413
1414 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1415 {
1416 unsigned int h;
1417 struct xfrm_state *x = NULL;
1418
1419 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1420
1421 if (m->reqid) {
1422 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1423 m->reqid, m->old_family);
1424 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1425 if (x->props.mode != m->mode ||
1426 x->id.proto != m->proto)
1427 continue;
1428 if (m->reqid && x->props.reqid != m->reqid)
1429 continue;
1430 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1431 m->old_family) ||
1432 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1433 m->old_family))
1434 continue;
1435 xfrm_state_hold(x);
1436 break;
1437 }
1438 } else {
1439 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1440 m->old_family);
1441 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1442 if (x->props.mode != m->mode ||
1443 x->id.proto != m->proto)
1444 continue;
1445 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1446 m->old_family) ||
1447 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1448 m->old_family))
1449 continue;
1450 xfrm_state_hold(x);
1451 break;
1452 }
1453 }
1454
1455 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1456
1457 return x;
1458 }
1459 EXPORT_SYMBOL(xfrm_migrate_state_find);
1460
1461 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1462 struct xfrm_migrate *m,
1463 struct xfrm_encap_tmpl *encap)
1464 {
1465 struct xfrm_state *xc;
1466
1467 xc = xfrm_state_clone(x, encap);
1468 if (!xc)
1469 return NULL;
1470
1471 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1472 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1473
1474 /* add state */
1475 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1476 /* a care is needed when the destination address of the
1477 state is to be updated as it is a part of triplet */
1478 xfrm_state_insert(xc);
1479 } else {
1480 if (xfrm_state_add(xc) < 0)
1481 goto error;
1482 }
1483
1484 return xc;
1485 error:
1486 xfrm_state_put(xc);
1487 return NULL;
1488 }
1489 EXPORT_SYMBOL(xfrm_state_migrate);
1490 #endif
1491
1492 int xfrm_state_update(struct xfrm_state *x)
1493 {
1494 struct xfrm_state *x1, *to_put;
1495 int err;
1496 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1497 struct net *net = xs_net(x);
1498
1499 to_put = NULL;
1500
1501 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1502 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1503
1504 err = -ESRCH;
1505 if (!x1)
1506 goto out;
1507
1508 if (xfrm_state_kern(x1)) {
1509 to_put = x1;
1510 err = -EEXIST;
1511 goto out;
1512 }
1513
1514 if (x1->km.state == XFRM_STATE_ACQ) {
1515 __xfrm_state_insert(x);
1516 x = NULL;
1517 }
1518 err = 0;
1519
1520 out:
1521 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1522
1523 if (to_put)
1524 xfrm_state_put(to_put);
1525
1526 if (err)
1527 return err;
1528
1529 if (!x) {
1530 xfrm_state_delete(x1);
1531 xfrm_state_put(x1);
1532 return 0;
1533 }
1534
1535 err = -EINVAL;
1536 spin_lock_bh(&x1->lock);
1537 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1538 if (x->encap && x1->encap &&
1539 x->encap->encap_type == x1->encap->encap_type)
1540 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1541 else if (x->encap || x1->encap)
1542 goto fail;
1543
1544 if (x->coaddr && x1->coaddr) {
1545 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1546 }
1547 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1548 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1549 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1550 x1->km.dying = 0;
1551
1552 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1553 if (x1->curlft.use_time)
1554 xfrm_state_check_expire(x1);
1555
1556 err = 0;
1557 x->km.state = XFRM_STATE_DEAD;
1558 __xfrm_state_put(x);
1559 }
1560
1561 fail:
1562 spin_unlock_bh(&x1->lock);
1563
1564 xfrm_state_put(x1);
1565
1566 return err;
1567 }
1568 EXPORT_SYMBOL(xfrm_state_update);
1569
1570 int xfrm_state_check_expire(struct xfrm_state *x)
1571 {
1572 if (!x->curlft.use_time)
1573 x->curlft.use_time = get_seconds();
1574
1575 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1576 x->curlft.packets >= x->lft.hard_packet_limit) {
1577 x->km.state = XFRM_STATE_EXPIRED;
1578 tasklet_hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL);
1579 return -EINVAL;
1580 }
1581
1582 if (!x->km.dying &&
1583 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1584 x->curlft.packets >= x->lft.soft_packet_limit)) {
1585 x->km.dying = 1;
1586 km_state_expired(x, 0, 0);
1587 }
1588 return 0;
1589 }
1590 EXPORT_SYMBOL(xfrm_state_check_expire);
1591
1592 struct xfrm_state *
1593 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1594 u8 proto, unsigned short family)
1595 {
1596 struct xfrm_state *x;
1597
1598 rcu_read_lock();
1599 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1600 rcu_read_unlock();
1601 return x;
1602 }
1603 EXPORT_SYMBOL(xfrm_state_lookup);
1604
1605 struct xfrm_state *
1606 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1607 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1608 u8 proto, unsigned short family)
1609 {
1610 struct xfrm_state *x;
1611
1612 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1613 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1614 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1615 return x;
1616 }
1617 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1618
1619 struct xfrm_state *
1620 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1621 u8 proto, const xfrm_address_t *daddr,
1622 const xfrm_address_t *saddr, int create, unsigned short family)
1623 {
1624 struct xfrm_state *x;
1625
1626 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1627 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1628 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1629
1630 return x;
1631 }
1632 EXPORT_SYMBOL(xfrm_find_acq);
1633
1634 #ifdef CONFIG_XFRM_SUB_POLICY
1635 int
1636 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1637 unsigned short family, struct net *net)
1638 {
1639 int i;
1640 int err = 0;
1641 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1642 if (!afinfo)
1643 return -EAFNOSUPPORT;
1644
1645 spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1646 if (afinfo->tmpl_sort)
1647 err = afinfo->tmpl_sort(dst, src, n);
1648 else
1649 for (i = 0; i < n; i++)
1650 dst[i] = src[i];
1651 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1652 rcu_read_unlock();
1653 return err;
1654 }
1655 EXPORT_SYMBOL(xfrm_tmpl_sort);
1656
1657 int
1658 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1659 unsigned short family)
1660 {
1661 int i;
1662 int err = 0;
1663 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1664 struct net *net = xs_net(*src);
1665
1666 if (!afinfo)
1667 return -EAFNOSUPPORT;
1668
1669 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1670 if (afinfo->state_sort)
1671 err = afinfo->state_sort(dst, src, n);
1672 else
1673 for (i = 0; i < n; i++)
1674 dst[i] = src[i];
1675 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1676 rcu_read_unlock();
1677 return err;
1678 }
1679 EXPORT_SYMBOL(xfrm_state_sort);
1680 #endif
1681
1682 /* Silly enough, but I'm lazy to build resolution list */
1683
1684 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1685 {
1686 int i;
1687
1688 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1689 struct xfrm_state *x;
1690
1691 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1692 if (x->km.seq == seq &&
1693 (mark & x->mark.m) == x->mark.v &&
1694 x->km.state == XFRM_STATE_ACQ) {
1695 xfrm_state_hold(x);
1696 return x;
1697 }
1698 }
1699 }
1700 return NULL;
1701 }
1702
1703 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1704 {
1705 struct xfrm_state *x;
1706
1707 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1708 x = __xfrm_find_acq_byseq(net, mark, seq);
1709 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1710 return x;
1711 }
1712 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1713
1714 u32 xfrm_get_acqseq(void)
1715 {
1716 u32 res;
1717 static atomic_t acqseq;
1718
1719 do {
1720 res = atomic_inc_return(&acqseq);
1721 } while (!res);
1722
1723 return res;
1724 }
1725 EXPORT_SYMBOL(xfrm_get_acqseq);
1726
1727 int verify_spi_info(u8 proto, u32 min, u32 max)
1728 {
1729 switch (proto) {
1730 case IPPROTO_AH:
1731 case IPPROTO_ESP:
1732 break;
1733
1734 case IPPROTO_COMP:
1735 /* IPCOMP spi is 16-bits. */
1736 if (max >= 0x10000)
1737 return -EINVAL;
1738 break;
1739
1740 default:
1741 return -EINVAL;
1742 }
1743
1744 if (min > max)
1745 return -EINVAL;
1746
1747 return 0;
1748 }
1749 EXPORT_SYMBOL(verify_spi_info);
1750
1751 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1752 {
1753 struct net *net = xs_net(x);
1754 unsigned int h;
1755 struct xfrm_state *x0;
1756 int err = -ENOENT;
1757 __be32 minspi = htonl(low);
1758 __be32 maxspi = htonl(high);
1759 u32 mark = x->mark.v & x->mark.m;
1760
1761 spin_lock_bh(&x->lock);
1762 if (x->km.state == XFRM_STATE_DEAD)
1763 goto unlock;
1764
1765 err = 0;
1766 if (x->id.spi)
1767 goto unlock;
1768
1769 err = -ENOENT;
1770
1771 if (minspi == maxspi) {
1772 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1773 if (x0) {
1774 xfrm_state_put(x0);
1775 goto unlock;
1776 }
1777 x->id.spi = minspi;
1778 } else {
1779 u32 spi = 0;
1780 for (h = 0; h < high-low+1; h++) {
1781 spi = low + prandom_u32()%(high-low+1);
1782 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1783 if (x0 == NULL) {
1784 x->id.spi = htonl(spi);
1785 break;
1786 }
1787 xfrm_state_put(x0);
1788 }
1789 }
1790 if (x->id.spi) {
1791 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1792 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1793 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1794 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1795
1796 err = 0;
1797 }
1798
1799 unlock:
1800 spin_unlock_bh(&x->lock);
1801
1802 return err;
1803 }
1804 EXPORT_SYMBOL(xfrm_alloc_spi);
1805
1806 static bool __xfrm_state_filter_match(struct xfrm_state *x,
1807 struct xfrm_address_filter *filter)
1808 {
1809 if (filter) {
1810 if ((filter->family == AF_INET ||
1811 filter->family == AF_INET6) &&
1812 x->props.family != filter->family)
1813 return false;
1814
1815 return addr_match(&x->props.saddr, &filter->saddr,
1816 filter->splen) &&
1817 addr_match(&x->id.daddr, &filter->daddr,
1818 filter->dplen);
1819 }
1820 return true;
1821 }
1822
1823 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1824 int (*func)(struct xfrm_state *, int, void*),
1825 void *data)
1826 {
1827 struct xfrm_state *state;
1828 struct xfrm_state_walk *x;
1829 int err = 0;
1830
1831 if (walk->seq != 0 && list_empty(&walk->all))
1832 return 0;
1833
1834 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1835 if (list_empty(&walk->all))
1836 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1837 else
1838 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
1839 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1840 if (x->state == XFRM_STATE_DEAD)
1841 continue;
1842 state = container_of(x, struct xfrm_state, km);
1843 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1844 continue;
1845 if (!__xfrm_state_filter_match(state, walk->filter))
1846 continue;
1847 err = func(state, walk->seq, data);
1848 if (err) {
1849 list_move_tail(&walk->all, &x->all);
1850 goto out;
1851 }
1852 walk->seq++;
1853 }
1854 if (walk->seq == 0) {
1855 err = -ENOENT;
1856 goto out;
1857 }
1858 list_del_init(&walk->all);
1859 out:
1860 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1861 return err;
1862 }
1863 EXPORT_SYMBOL(xfrm_state_walk);
1864
1865 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1866 struct xfrm_address_filter *filter)
1867 {
1868 INIT_LIST_HEAD(&walk->all);
1869 walk->proto = proto;
1870 walk->state = XFRM_STATE_DEAD;
1871 walk->seq = 0;
1872 walk->filter = filter;
1873 }
1874 EXPORT_SYMBOL(xfrm_state_walk_init);
1875
1876 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1877 {
1878 kfree(walk->filter);
1879
1880 if (list_empty(&walk->all))
1881 return;
1882
1883 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1884 list_del(&walk->all);
1885 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1886 }
1887 EXPORT_SYMBOL(xfrm_state_walk_done);
1888
1889 static void xfrm_replay_timer_handler(struct timer_list *t)
1890 {
1891 struct xfrm_state *x = from_timer(x, t, rtimer);
1892
1893 spin_lock(&x->lock);
1894
1895 if (x->km.state == XFRM_STATE_VALID) {
1896 if (xfrm_aevent_is_on(xs_net(x)))
1897 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1898 else
1899 x->xflags |= XFRM_TIME_DEFER;
1900 }
1901
1902 spin_unlock(&x->lock);
1903 }
1904
1905 static LIST_HEAD(xfrm_km_list);
1906
1907 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1908 {
1909 struct xfrm_mgr *km;
1910
1911 rcu_read_lock();
1912 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1913 if (km->notify_policy)
1914 km->notify_policy(xp, dir, c);
1915 rcu_read_unlock();
1916 }
1917
1918 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1919 {
1920 struct xfrm_mgr *km;
1921 rcu_read_lock();
1922 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1923 if (km->notify)
1924 km->notify(x, c);
1925 rcu_read_unlock();
1926 }
1927
1928 EXPORT_SYMBOL(km_policy_notify);
1929 EXPORT_SYMBOL(km_state_notify);
1930
1931 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1932 {
1933 struct km_event c;
1934
1935 c.data.hard = hard;
1936 c.portid = portid;
1937 c.event = XFRM_MSG_EXPIRE;
1938 km_state_notify(x, &c);
1939 }
1940
1941 EXPORT_SYMBOL(km_state_expired);
1942 /*
1943 * We send to all registered managers regardless of failure
1944 * We are happy with one success
1945 */
1946 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1947 {
1948 int err = -EINVAL, acqret;
1949 struct xfrm_mgr *km;
1950
1951 rcu_read_lock();
1952 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1953 acqret = km->acquire(x, t, pol);
1954 if (!acqret)
1955 err = acqret;
1956 }
1957 rcu_read_unlock();
1958 return err;
1959 }
1960 EXPORT_SYMBOL(km_query);
1961
1962 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1963 {
1964 int err = -EINVAL;
1965 struct xfrm_mgr *km;
1966
1967 rcu_read_lock();
1968 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1969 if (km->new_mapping)
1970 err = km->new_mapping(x, ipaddr, sport);
1971 if (!err)
1972 break;
1973 }
1974 rcu_read_unlock();
1975 return err;
1976 }
1977 EXPORT_SYMBOL(km_new_mapping);
1978
1979 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1980 {
1981 struct km_event c;
1982
1983 c.data.hard = hard;
1984 c.portid = portid;
1985 c.event = XFRM_MSG_POLEXPIRE;
1986 km_policy_notify(pol, dir, &c);
1987 }
1988 EXPORT_SYMBOL(km_policy_expired);
1989
1990 #ifdef CONFIG_XFRM_MIGRATE
1991 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1992 const struct xfrm_migrate *m, int num_migrate,
1993 const struct xfrm_kmaddress *k,
1994 const struct xfrm_encap_tmpl *encap)
1995 {
1996 int err = -EINVAL;
1997 int ret;
1998 struct xfrm_mgr *km;
1999
2000 rcu_read_lock();
2001 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2002 if (km->migrate) {
2003 ret = km->migrate(sel, dir, type, m, num_migrate, k,
2004 encap);
2005 if (!ret)
2006 err = ret;
2007 }
2008 }
2009 rcu_read_unlock();
2010 return err;
2011 }
2012 EXPORT_SYMBOL(km_migrate);
2013 #endif
2014
2015 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2016 {
2017 int err = -EINVAL;
2018 int ret;
2019 struct xfrm_mgr *km;
2020
2021 rcu_read_lock();
2022 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2023 if (km->report) {
2024 ret = km->report(net, proto, sel, addr);
2025 if (!ret)
2026 err = ret;
2027 }
2028 }
2029 rcu_read_unlock();
2030 return err;
2031 }
2032 EXPORT_SYMBOL(km_report);
2033
2034 bool km_is_alive(const struct km_event *c)
2035 {
2036 struct xfrm_mgr *km;
2037 bool is_alive = false;
2038
2039 rcu_read_lock();
2040 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2041 if (km->is_alive && km->is_alive(c)) {
2042 is_alive = true;
2043 break;
2044 }
2045 }
2046 rcu_read_unlock();
2047
2048 return is_alive;
2049 }
2050 EXPORT_SYMBOL(km_is_alive);
2051
2052 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
2053 {
2054 int err;
2055 u8 *data;
2056 struct xfrm_mgr *km;
2057 struct xfrm_policy *pol = NULL;
2058
2059 #ifdef CONFIG_COMPAT
2060 if (in_compat_syscall())
2061 return -EOPNOTSUPP;
2062 #endif
2063
2064 if (!optval && !optlen) {
2065 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
2066 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
2067 __sk_dst_reset(sk);
2068 return 0;
2069 }
2070
2071 if (optlen <= 0 || optlen > PAGE_SIZE)
2072 return -EMSGSIZE;
2073
2074 data = memdup_user(optval, optlen);
2075 if (IS_ERR(data))
2076 return PTR_ERR(data);
2077
2078 err = -EINVAL;
2079 rcu_read_lock();
2080 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2081 pol = km->compile_policy(sk, optname, data,
2082 optlen, &err);
2083 if (err >= 0)
2084 break;
2085 }
2086 rcu_read_unlock();
2087
2088 if (err >= 0) {
2089 xfrm_sk_policy_insert(sk, err, pol);
2090 xfrm_pol_put(pol);
2091 __sk_dst_reset(sk);
2092 err = 0;
2093 }
2094
2095 kfree(data);
2096 return err;
2097 }
2098 EXPORT_SYMBOL(xfrm_user_policy);
2099
2100 static DEFINE_SPINLOCK(xfrm_km_lock);
2101
2102 int xfrm_register_km(struct xfrm_mgr *km)
2103 {
2104 spin_lock_bh(&xfrm_km_lock);
2105 list_add_tail_rcu(&km->list, &xfrm_km_list);
2106 spin_unlock_bh(&xfrm_km_lock);
2107 return 0;
2108 }
2109 EXPORT_SYMBOL(xfrm_register_km);
2110
2111 int xfrm_unregister_km(struct xfrm_mgr *km)
2112 {
2113 spin_lock_bh(&xfrm_km_lock);
2114 list_del_rcu(&km->list);
2115 spin_unlock_bh(&xfrm_km_lock);
2116 synchronize_rcu();
2117 return 0;
2118 }
2119 EXPORT_SYMBOL(xfrm_unregister_km);
2120
2121 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2122 {
2123 int err = 0;
2124
2125 if (WARN_ON(afinfo->family >= NPROTO))
2126 return -EAFNOSUPPORT;
2127
2128 spin_lock_bh(&xfrm_state_afinfo_lock);
2129 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2130 err = -EEXIST;
2131 else
2132 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2133 spin_unlock_bh(&xfrm_state_afinfo_lock);
2134 return err;
2135 }
2136 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2137
2138 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2139 {
2140 int err = 0, family = afinfo->family;
2141
2142 if (WARN_ON(family >= NPROTO))
2143 return -EAFNOSUPPORT;
2144
2145 spin_lock_bh(&xfrm_state_afinfo_lock);
2146 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2147 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2148 err = -EINVAL;
2149 else
2150 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2151 }
2152 spin_unlock_bh(&xfrm_state_afinfo_lock);
2153 synchronize_rcu();
2154 return err;
2155 }
2156 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2157
2158 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2159 {
2160 if (unlikely(family >= NPROTO))
2161 return NULL;
2162
2163 return rcu_dereference(xfrm_state_afinfo[family]);
2164 }
2165
2166 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2167 {
2168 struct xfrm_state_afinfo *afinfo;
2169 if (unlikely(family >= NPROTO))
2170 return NULL;
2171 rcu_read_lock();
2172 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2173 if (unlikely(!afinfo))
2174 rcu_read_unlock();
2175 return afinfo;
2176 }
2177
2178 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
2179 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2180 {
2181 if (x->tunnel) {
2182 struct xfrm_state *t = x->tunnel;
2183
2184 if (atomic_read(&t->tunnel_users) == 2)
2185 xfrm_state_delete(t);
2186 atomic_dec(&t->tunnel_users);
2187 xfrm_state_put(t);
2188 x->tunnel = NULL;
2189 }
2190 }
2191 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2192
2193 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
2194 {
2195 const struct xfrm_type *type = READ_ONCE(x->type);
2196
2197 if (x->km.state == XFRM_STATE_VALID &&
2198 type && type->get_mtu)
2199 return type->get_mtu(x, mtu);
2200
2201 return mtu - x->props.header_len;
2202 }
2203
2204 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
2205 {
2206 struct xfrm_state_afinfo *afinfo;
2207 struct xfrm_mode *inner_mode;
2208 int family = x->props.family;
2209 int err;
2210
2211 err = -EAFNOSUPPORT;
2212 afinfo = xfrm_state_get_afinfo(family);
2213 if (!afinfo)
2214 goto error;
2215
2216 err = 0;
2217 if (afinfo->init_flags)
2218 err = afinfo->init_flags(x);
2219
2220 rcu_read_unlock();
2221
2222 if (err)
2223 goto error;
2224
2225 err = -EPROTONOSUPPORT;
2226
2227 if (x->sel.family != AF_UNSPEC) {
2228 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2229 if (inner_mode == NULL)
2230 goto error;
2231
2232 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2233 family != x->sel.family) {
2234 xfrm_put_mode(inner_mode);
2235 goto error;
2236 }
2237
2238 x->inner_mode = inner_mode;
2239 } else {
2240 struct xfrm_mode *inner_mode_iaf;
2241 int iafamily = AF_INET;
2242
2243 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2244 if (inner_mode == NULL)
2245 goto error;
2246
2247 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2248 xfrm_put_mode(inner_mode);
2249 goto error;
2250 }
2251 x->inner_mode = inner_mode;
2252
2253 if (x->props.family == AF_INET)
2254 iafamily = AF_INET6;
2255
2256 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2257 if (inner_mode_iaf) {
2258 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2259 x->inner_mode_iaf = inner_mode_iaf;
2260 else
2261 xfrm_put_mode(inner_mode_iaf);
2262 }
2263 }
2264
2265 x->type = xfrm_get_type(x->id.proto, family);
2266 if (x->type == NULL)
2267 goto error;
2268
2269 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2270
2271 err = x->type->init_state(x);
2272 if (err)
2273 goto error;
2274
2275 x->outer_mode = xfrm_get_mode(x->props.mode, family);
2276 if (x->outer_mode == NULL) {
2277 err = -EPROTONOSUPPORT;
2278 goto error;
2279 }
2280
2281 if (init_replay) {
2282 err = xfrm_init_replay(x);
2283 if (err)
2284 goto error;
2285 }
2286
2287 error:
2288 return err;
2289 }
2290
2291 EXPORT_SYMBOL(__xfrm_init_state);
2292
2293 int xfrm_init_state(struct xfrm_state *x)
2294 {
2295 int err;
2296
2297 err = __xfrm_init_state(x, true, false);
2298 if (!err)
2299 x->km.state = XFRM_STATE_VALID;
2300
2301 return err;
2302 }
2303
2304 EXPORT_SYMBOL(xfrm_init_state);
2305
2306 int __net_init xfrm_state_init(struct net *net)
2307 {
2308 unsigned int sz;
2309
2310 INIT_LIST_HEAD(&net->xfrm.state_all);
2311
2312 sz = sizeof(struct hlist_head) * 8;
2313
2314 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2315 if (!net->xfrm.state_bydst)
2316 goto out_bydst;
2317 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2318 if (!net->xfrm.state_bysrc)
2319 goto out_bysrc;
2320 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2321 if (!net->xfrm.state_byspi)
2322 goto out_byspi;
2323 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2324
2325 net->xfrm.state_num = 0;
2326 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2327 spin_lock_init(&net->xfrm.xfrm_state_lock);
2328 return 0;
2329
2330 out_byspi:
2331 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2332 out_bysrc:
2333 xfrm_hash_free(net->xfrm.state_bydst, sz);
2334 out_bydst:
2335 return -ENOMEM;
2336 }
2337
2338 void xfrm_state_fini(struct net *net)
2339 {
2340 unsigned int sz;
2341
2342 flush_work(&net->xfrm.state_hash_work);
2343 xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
2344 flush_work(&xfrm_state_gc_work);
2345
2346 WARN_ON(!list_empty(&net->xfrm.state_all));
2347
2348 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2349 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2350 xfrm_hash_free(net->xfrm.state_byspi, sz);
2351 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2352 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2353 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2354 xfrm_hash_free(net->xfrm.state_bydst, sz);
2355 }
2356
2357 #ifdef CONFIG_AUDITSYSCALL
2358 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2359 struct audit_buffer *audit_buf)
2360 {
2361 struct xfrm_sec_ctx *ctx = x->security;
2362 u32 spi = ntohl(x->id.spi);
2363
2364 if (ctx)
2365 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2366 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2367
2368 switch (x->props.family) {
2369 case AF_INET:
2370 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2371 &x->props.saddr.a4, &x->id.daddr.a4);
2372 break;
2373 case AF_INET6:
2374 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2375 x->props.saddr.a6, x->id.daddr.a6);
2376 break;
2377 }
2378
2379 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2380 }
2381
2382 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2383 struct audit_buffer *audit_buf)
2384 {
2385 const struct iphdr *iph4;
2386 const struct ipv6hdr *iph6;
2387
2388 switch (family) {
2389 case AF_INET:
2390 iph4 = ip_hdr(skb);
2391 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2392 &iph4->saddr, &iph4->daddr);
2393 break;
2394 case AF_INET6:
2395 iph6 = ipv6_hdr(skb);
2396 audit_log_format(audit_buf,
2397 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2398 &iph6->saddr, &iph6->daddr,
2399 iph6->flow_lbl[0] & 0x0f,
2400 iph6->flow_lbl[1],
2401 iph6->flow_lbl[2]);
2402 break;
2403 }
2404 }
2405
2406 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2407 {
2408 struct audit_buffer *audit_buf;
2409
2410 audit_buf = xfrm_audit_start("SAD-add");
2411 if (audit_buf == NULL)
2412 return;
2413 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2414 xfrm_audit_helper_sainfo(x, audit_buf);
2415 audit_log_format(audit_buf, " res=%u", result);
2416 audit_log_end(audit_buf);
2417 }
2418 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2419
2420 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2421 {
2422 struct audit_buffer *audit_buf;
2423
2424 audit_buf = xfrm_audit_start("SAD-delete");
2425 if (audit_buf == NULL)
2426 return;
2427 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2428 xfrm_audit_helper_sainfo(x, audit_buf);
2429 audit_log_format(audit_buf, " res=%u", result);
2430 audit_log_end(audit_buf);
2431 }
2432 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2433
2434 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2435 struct sk_buff *skb)
2436 {
2437 struct audit_buffer *audit_buf;
2438 u32 spi;
2439
2440 audit_buf = xfrm_audit_start("SA-replay-overflow");
2441 if (audit_buf == NULL)
2442 return;
2443 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2444 /* don't record the sequence number because it's inherent in this kind
2445 * of audit message */
2446 spi = ntohl(x->id.spi);
2447 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2448 audit_log_end(audit_buf);
2449 }
2450 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2451
2452 void xfrm_audit_state_replay(struct xfrm_state *x,
2453 struct sk_buff *skb, __be32 net_seq)
2454 {
2455 struct audit_buffer *audit_buf;
2456 u32 spi;
2457
2458 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2459 if (audit_buf == NULL)
2460 return;
2461 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2462 spi = ntohl(x->id.spi);
2463 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2464 spi, spi, ntohl(net_seq));
2465 audit_log_end(audit_buf);
2466 }
2467 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2468
2469 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2470 {
2471 struct audit_buffer *audit_buf;
2472
2473 audit_buf = xfrm_audit_start("SA-notfound");
2474 if (audit_buf == NULL)
2475 return;
2476 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2477 audit_log_end(audit_buf);
2478 }
2479 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2480
2481 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2482 __be32 net_spi, __be32 net_seq)
2483 {
2484 struct audit_buffer *audit_buf;
2485 u32 spi;
2486
2487 audit_buf = xfrm_audit_start("SA-notfound");
2488 if (audit_buf == NULL)
2489 return;
2490 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2491 spi = ntohl(net_spi);
2492 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2493 spi, spi, ntohl(net_seq));
2494 audit_log_end(audit_buf);
2495 }
2496 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2497
2498 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2499 struct sk_buff *skb, u8 proto)
2500 {
2501 struct audit_buffer *audit_buf;
2502 __be32 net_spi;
2503 __be32 net_seq;
2504
2505 audit_buf = xfrm_audit_start("SA-icv-failure");
2506 if (audit_buf == NULL)
2507 return;
2508 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2509 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2510 u32 spi = ntohl(net_spi);
2511 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2512 spi, spi, ntohl(net_seq));
2513 }
2514 audit_log_end(audit_buf);
2515 }
2516 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2517 #endif /* CONFIG_AUDITSYSCALL */
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