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[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 if (!type && try_load) {
317 request_module("xfrm-offload-%d-%d", family, proto);
318 try_load = 0;
319 goto retry;
320 }
321
322 rcu_read_unlock();
323 return type;
324 }
325
326 static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
327 {
328 module_put(type->owner);
329 }
330
331 static DEFINE_SPINLOCK(xfrm_mode_lock);
332 int xfrm_register_mode(struct xfrm_mode *mode, int family)
333 {
334 struct xfrm_state_afinfo *afinfo;
335 struct xfrm_mode **modemap;
336 int err;
337
338 if (unlikely(mode->encap >= XFRM_MODE_MAX))
339 return -EINVAL;
340
341 afinfo = xfrm_state_get_afinfo(family);
342 if (unlikely(afinfo == NULL))
343 return -EAFNOSUPPORT;
344
345 err = -EEXIST;
346 modemap = afinfo->mode_map;
347 spin_lock_bh(&xfrm_mode_lock);
348 if (modemap[mode->encap])
349 goto out;
350
351 err = -ENOENT;
352 if (!try_module_get(afinfo->owner))
353 goto out;
354
355 mode->afinfo = afinfo;
356 modemap[mode->encap] = mode;
357 err = 0;
358
359 out:
360 spin_unlock_bh(&xfrm_mode_lock);
361 rcu_read_unlock();
362 return err;
363 }
364 EXPORT_SYMBOL(xfrm_register_mode);
365
366 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
367 {
368 struct xfrm_state_afinfo *afinfo;
369 struct xfrm_mode **modemap;
370 int err;
371
372 if (unlikely(mode->encap >= XFRM_MODE_MAX))
373 return -EINVAL;
374
375 afinfo = xfrm_state_get_afinfo(family);
376 if (unlikely(afinfo == NULL))
377 return -EAFNOSUPPORT;
378
379 err = -ENOENT;
380 modemap = afinfo->mode_map;
381 spin_lock_bh(&xfrm_mode_lock);
382 if (likely(modemap[mode->encap] == mode)) {
383 modemap[mode->encap] = NULL;
384 module_put(mode->afinfo->owner);
385 err = 0;
386 }
387
388 spin_unlock_bh(&xfrm_mode_lock);
389 rcu_read_unlock();
390 return err;
391 }
392 EXPORT_SYMBOL(xfrm_unregister_mode);
393
394 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
395 {
396 struct xfrm_state_afinfo *afinfo;
397 struct xfrm_mode *mode;
398 int modload_attempted = 0;
399
400 if (unlikely(encap >= XFRM_MODE_MAX))
401 return NULL;
402
403 retry:
404 afinfo = xfrm_state_get_afinfo(family);
405 if (unlikely(afinfo == NULL))
406 return NULL;
407
408 mode = READ_ONCE(afinfo->mode_map[encap]);
409 if (unlikely(mode && !try_module_get(mode->owner)))
410 mode = NULL;
411
412 rcu_read_unlock();
413 if (!mode && !modload_attempted) {
414 request_module("xfrm-mode-%d-%d", family, encap);
415 modload_attempted = 1;
416 goto retry;
417 }
418
419 return mode;
420 }
421
422 static void xfrm_put_mode(struct xfrm_mode *mode)
423 {
424 module_put(mode->owner);
425 }
426
427 static void xfrm_state_gc_destroy(struct xfrm_state *x)
428 {
429 tasklet_hrtimer_cancel(&x->mtimer);
430 del_timer_sync(&x->rtimer);
431 kfree(x->aead);
432 kfree(x->aalg);
433 kfree(x->ealg);
434 kfree(x->calg);
435 kfree(x->encap);
436 kfree(x->coaddr);
437 kfree(x->replay_esn);
438 kfree(x->preplay_esn);
439 if (x->inner_mode)
440 xfrm_put_mode(x->inner_mode);
441 if (x->inner_mode_iaf)
442 xfrm_put_mode(x->inner_mode_iaf);
443 if (x->outer_mode)
444 xfrm_put_mode(x->outer_mode);
445 if (x->type_offload)
446 xfrm_put_type_offload(x->type_offload);
447 if (x->type) {
448 x->type->destructor(x);
449 xfrm_put_type(x->type);
450 }
451 xfrm_dev_state_free(x);
452 security_xfrm_state_free(x);
453 kfree(x);
454 }
455
456 static void xfrm_state_gc_task(struct work_struct *work)
457 {
458 struct xfrm_state *x;
459 struct hlist_node *tmp;
460 struct hlist_head gc_list;
461
462 spin_lock_bh(&xfrm_state_gc_lock);
463 hlist_move_list(&xfrm_state_gc_list, &gc_list);
464 spin_unlock_bh(&xfrm_state_gc_lock);
465
466 synchronize_rcu();
467
468 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
469 xfrm_state_gc_destroy(x);
470 }
471
472 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
473 {
474 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
475 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
476 unsigned long now = get_seconds();
477 long next = LONG_MAX;
478 int warn = 0;
479 int err = 0;
480
481 spin_lock(&x->lock);
482 if (x->km.state == XFRM_STATE_DEAD)
483 goto out;
484 if (x->km.state == XFRM_STATE_EXPIRED)
485 goto expired;
486 if (x->lft.hard_add_expires_seconds) {
487 long tmo = x->lft.hard_add_expires_seconds +
488 x->curlft.add_time - now;
489 if (tmo <= 0) {
490 if (x->xflags & XFRM_SOFT_EXPIRE) {
491 /* enter hard expire without soft expire first?!
492 * setting a new date could trigger this.
493 * workaround: fix x->curflt.add_time by below:
494 */
495 x->curlft.add_time = now - x->saved_tmo - 1;
496 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
497 } else
498 goto expired;
499 }
500 if (tmo < next)
501 next = tmo;
502 }
503 if (x->lft.hard_use_expires_seconds) {
504 long tmo = x->lft.hard_use_expires_seconds +
505 (x->curlft.use_time ? : now) - now;
506 if (tmo <= 0)
507 goto expired;
508 if (tmo < next)
509 next = tmo;
510 }
511 if (x->km.dying)
512 goto resched;
513 if (x->lft.soft_add_expires_seconds) {
514 long tmo = x->lft.soft_add_expires_seconds +
515 x->curlft.add_time - now;
516 if (tmo <= 0) {
517 warn = 1;
518 x->xflags &= ~XFRM_SOFT_EXPIRE;
519 } else if (tmo < next) {
520 next = tmo;
521 x->xflags |= XFRM_SOFT_EXPIRE;
522 x->saved_tmo = tmo;
523 }
524 }
525 if (x->lft.soft_use_expires_seconds) {
526 long tmo = x->lft.soft_use_expires_seconds +
527 (x->curlft.use_time ? : now) - now;
528 if (tmo <= 0)
529 warn = 1;
530 else if (tmo < next)
531 next = tmo;
532 }
533
534 x->km.dying = warn;
535 if (warn)
536 km_state_expired(x, 0, 0);
537 resched:
538 if (next != LONG_MAX) {
539 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
540 }
541
542 goto out;
543
544 expired:
545 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
546 x->km.state = XFRM_STATE_EXPIRED;
547
548 err = __xfrm_state_delete(x);
549 if (!err)
550 km_state_expired(x, 1, 0);
551
552 xfrm_audit_state_delete(x, err ? 0 : 1, true);
553
554 out:
555 spin_unlock(&x->lock);
556 return HRTIMER_NORESTART;
557 }
558
559 static void xfrm_replay_timer_handler(unsigned long data);
560
561 struct xfrm_state *xfrm_state_alloc(struct net *net)
562 {
563 struct xfrm_state *x;
564
565 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
566
567 if (x) {
568 write_pnet(&x->xs_net, net);
569 refcount_set(&x->refcnt, 1);
570 atomic_set(&x->tunnel_users, 0);
571 INIT_LIST_HEAD(&x->km.all);
572 INIT_HLIST_NODE(&x->bydst);
573 INIT_HLIST_NODE(&x->bysrc);
574 INIT_HLIST_NODE(&x->byspi);
575 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
576 CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
577 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
578 (unsigned long)x);
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 if (!x->aead)
1348 goto error;
1349 }
1350 if (orig->ealg) {
1351 x->ealg = xfrm_algo_clone(orig->ealg);
1352 if (!x->ealg)
1353 goto error;
1354 }
1355 x->props.ealgo = orig->props.ealgo;
1356
1357 if (orig->calg) {
1358 x->calg = xfrm_algo_clone(orig->calg);
1359 if (!x->calg)
1360 goto error;
1361 }
1362 x->props.calgo = orig->props.calgo;
1363
1364 if (encap || orig->encap) {
1365 if (encap)
1366 x->encap = kmemdup(encap, sizeof(*x->encap),
1367 GFP_KERNEL);
1368 else
1369 x->encap = kmemdup(orig->encap, sizeof(*x->encap),
1370 GFP_KERNEL);
1371
1372 if (!x->encap)
1373 goto error;
1374 }
1375
1376 if (orig->coaddr) {
1377 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1378 GFP_KERNEL);
1379 if (!x->coaddr)
1380 goto error;
1381 }
1382
1383 if (orig->replay_esn) {
1384 if (xfrm_replay_clone(x, orig))
1385 goto error;
1386 }
1387
1388 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1389
1390 if (xfrm_init_state(x) < 0)
1391 goto error;
1392
1393 x->props.flags = orig->props.flags;
1394 x->props.extra_flags = orig->props.extra_flags;
1395
1396 x->tfcpad = orig->tfcpad;
1397 x->replay_maxdiff = orig->replay_maxdiff;
1398 x->replay_maxage = orig->replay_maxage;
1399 x->curlft.add_time = orig->curlft.add_time;
1400 x->km.state = orig->km.state;
1401 x->km.seq = orig->km.seq;
1402 x->replay = orig->replay;
1403 x->preplay = orig->preplay;
1404
1405 return x;
1406
1407 error:
1408 xfrm_state_put(x);
1409 out:
1410 return NULL;
1411 }
1412
1413 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1414 {
1415 unsigned int h;
1416 struct xfrm_state *x = NULL;
1417
1418 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1419
1420 if (m->reqid) {
1421 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1422 m->reqid, m->old_family);
1423 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1424 if (x->props.mode != m->mode ||
1425 x->id.proto != m->proto)
1426 continue;
1427 if (m->reqid && x->props.reqid != m->reqid)
1428 continue;
1429 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1430 m->old_family) ||
1431 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1432 m->old_family))
1433 continue;
1434 xfrm_state_hold(x);
1435 break;
1436 }
1437 } else {
1438 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1439 m->old_family);
1440 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1441 if (x->props.mode != m->mode ||
1442 x->id.proto != m->proto)
1443 continue;
1444 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1445 m->old_family) ||
1446 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1447 m->old_family))
1448 continue;
1449 xfrm_state_hold(x);
1450 break;
1451 }
1452 }
1453
1454 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1455
1456 return x;
1457 }
1458 EXPORT_SYMBOL(xfrm_migrate_state_find);
1459
1460 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1461 struct xfrm_migrate *m,
1462 struct xfrm_encap_tmpl *encap)
1463 {
1464 struct xfrm_state *xc;
1465
1466 xc = xfrm_state_clone(x, encap);
1467 if (!xc)
1468 return NULL;
1469
1470 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1471 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1472
1473 /* add state */
1474 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1475 /* a care is needed when the destination address of the
1476 state is to be updated as it is a part of triplet */
1477 xfrm_state_insert(xc);
1478 } else {
1479 if (xfrm_state_add(xc) < 0)
1480 goto error;
1481 }
1482
1483 return xc;
1484 error:
1485 xfrm_state_put(xc);
1486 return NULL;
1487 }
1488 EXPORT_SYMBOL(xfrm_state_migrate);
1489 #endif
1490
1491 int xfrm_state_update(struct xfrm_state *x)
1492 {
1493 struct xfrm_state *x1, *to_put;
1494 int err;
1495 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1496 struct net *net = xs_net(x);
1497
1498 to_put = NULL;
1499
1500 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1501 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1502
1503 err = -ESRCH;
1504 if (!x1)
1505 goto out;
1506
1507 if (xfrm_state_kern(x1)) {
1508 to_put = x1;
1509 err = -EEXIST;
1510 goto out;
1511 }
1512
1513 if (x1->km.state == XFRM_STATE_ACQ) {
1514 __xfrm_state_insert(x);
1515 x = NULL;
1516 }
1517 err = 0;
1518
1519 out:
1520 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1521
1522 if (to_put)
1523 xfrm_state_put(to_put);
1524
1525 if (err)
1526 return err;
1527
1528 if (!x) {
1529 xfrm_state_delete(x1);
1530 xfrm_state_put(x1);
1531 return 0;
1532 }
1533
1534 err = -EINVAL;
1535 spin_lock_bh(&x1->lock);
1536 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1537 if (x->encap && x1->encap)
1538 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1539 if (x->coaddr && x1->coaddr) {
1540 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1541 }
1542 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1543 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1544 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1545 x1->km.dying = 0;
1546
1547 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1548 if (x1->curlft.use_time)
1549 xfrm_state_check_expire(x1);
1550
1551 err = 0;
1552 x->km.state = XFRM_STATE_DEAD;
1553 __xfrm_state_put(x);
1554 }
1555 spin_unlock_bh(&x1->lock);
1556
1557 xfrm_state_put(x1);
1558
1559 return err;
1560 }
1561 EXPORT_SYMBOL(xfrm_state_update);
1562
1563 int xfrm_state_check_expire(struct xfrm_state *x)
1564 {
1565 if (!x->curlft.use_time)
1566 x->curlft.use_time = get_seconds();
1567
1568 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1569 x->curlft.packets >= x->lft.hard_packet_limit) {
1570 x->km.state = XFRM_STATE_EXPIRED;
1571 tasklet_hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL);
1572 return -EINVAL;
1573 }
1574
1575 if (!x->km.dying &&
1576 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1577 x->curlft.packets >= x->lft.soft_packet_limit)) {
1578 x->km.dying = 1;
1579 km_state_expired(x, 0, 0);
1580 }
1581 return 0;
1582 }
1583 EXPORT_SYMBOL(xfrm_state_check_expire);
1584
1585 struct xfrm_state *
1586 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1587 u8 proto, unsigned short family)
1588 {
1589 struct xfrm_state *x;
1590
1591 rcu_read_lock();
1592 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1593 rcu_read_unlock();
1594 return x;
1595 }
1596 EXPORT_SYMBOL(xfrm_state_lookup);
1597
1598 struct xfrm_state *
1599 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1600 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1601 u8 proto, unsigned short family)
1602 {
1603 struct xfrm_state *x;
1604
1605 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1606 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1607 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1608 return x;
1609 }
1610 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1611
1612 struct xfrm_state *
1613 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1614 u8 proto, const xfrm_address_t *daddr,
1615 const xfrm_address_t *saddr, int create, unsigned short family)
1616 {
1617 struct xfrm_state *x;
1618
1619 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1620 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1621 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1622
1623 return x;
1624 }
1625 EXPORT_SYMBOL(xfrm_find_acq);
1626
1627 #ifdef CONFIG_XFRM_SUB_POLICY
1628 int
1629 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1630 unsigned short family, struct net *net)
1631 {
1632 int i;
1633 int err = 0;
1634 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1635 if (!afinfo)
1636 return -EAFNOSUPPORT;
1637
1638 spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1639 if (afinfo->tmpl_sort)
1640 err = afinfo->tmpl_sort(dst, src, n);
1641 else
1642 for (i = 0; i < n; i++)
1643 dst[i] = src[i];
1644 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1645 rcu_read_unlock();
1646 return err;
1647 }
1648 EXPORT_SYMBOL(xfrm_tmpl_sort);
1649
1650 int
1651 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1652 unsigned short family)
1653 {
1654 int i;
1655 int err = 0;
1656 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1657 struct net *net = xs_net(*src);
1658
1659 if (!afinfo)
1660 return -EAFNOSUPPORT;
1661
1662 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1663 if (afinfo->state_sort)
1664 err = afinfo->state_sort(dst, src, n);
1665 else
1666 for (i = 0; i < n; i++)
1667 dst[i] = src[i];
1668 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1669 rcu_read_unlock();
1670 return err;
1671 }
1672 EXPORT_SYMBOL(xfrm_state_sort);
1673 #endif
1674
1675 /* Silly enough, but I'm lazy to build resolution list */
1676
1677 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1678 {
1679 int i;
1680
1681 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1682 struct xfrm_state *x;
1683
1684 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1685 if (x->km.seq == seq &&
1686 (mark & x->mark.m) == x->mark.v &&
1687 x->km.state == XFRM_STATE_ACQ) {
1688 xfrm_state_hold(x);
1689 return x;
1690 }
1691 }
1692 }
1693 return NULL;
1694 }
1695
1696 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1697 {
1698 struct xfrm_state *x;
1699
1700 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1701 x = __xfrm_find_acq_byseq(net, mark, seq);
1702 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1703 return x;
1704 }
1705 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1706
1707 u32 xfrm_get_acqseq(void)
1708 {
1709 u32 res;
1710 static atomic_t acqseq;
1711
1712 do {
1713 res = atomic_inc_return(&acqseq);
1714 } while (!res);
1715
1716 return res;
1717 }
1718 EXPORT_SYMBOL(xfrm_get_acqseq);
1719
1720 int verify_spi_info(u8 proto, u32 min, u32 max)
1721 {
1722 switch (proto) {
1723 case IPPROTO_AH:
1724 case IPPROTO_ESP:
1725 break;
1726
1727 case IPPROTO_COMP:
1728 /* IPCOMP spi is 16-bits. */
1729 if (max >= 0x10000)
1730 return -EINVAL;
1731 break;
1732
1733 default:
1734 return -EINVAL;
1735 }
1736
1737 if (min > max)
1738 return -EINVAL;
1739
1740 return 0;
1741 }
1742 EXPORT_SYMBOL(verify_spi_info);
1743
1744 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1745 {
1746 struct net *net = xs_net(x);
1747 unsigned int h;
1748 struct xfrm_state *x0;
1749 int err = -ENOENT;
1750 __be32 minspi = htonl(low);
1751 __be32 maxspi = htonl(high);
1752 u32 mark = x->mark.v & x->mark.m;
1753
1754 spin_lock_bh(&x->lock);
1755 if (x->km.state == XFRM_STATE_DEAD)
1756 goto unlock;
1757
1758 err = 0;
1759 if (x->id.spi)
1760 goto unlock;
1761
1762 err = -ENOENT;
1763
1764 if (minspi == maxspi) {
1765 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1766 if (x0) {
1767 xfrm_state_put(x0);
1768 goto unlock;
1769 }
1770 x->id.spi = minspi;
1771 } else {
1772 u32 spi = 0;
1773 for (h = 0; h < high-low+1; h++) {
1774 spi = low + prandom_u32()%(high-low+1);
1775 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1776 if (x0 == NULL) {
1777 x->id.spi = htonl(spi);
1778 break;
1779 }
1780 xfrm_state_put(x0);
1781 }
1782 }
1783 if (x->id.spi) {
1784 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1785 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1786 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1787 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1788
1789 err = 0;
1790 }
1791
1792 unlock:
1793 spin_unlock_bh(&x->lock);
1794
1795 return err;
1796 }
1797 EXPORT_SYMBOL(xfrm_alloc_spi);
1798
1799 static bool __xfrm_state_filter_match(struct xfrm_state *x,
1800 struct xfrm_address_filter *filter)
1801 {
1802 if (filter) {
1803 if ((filter->family == AF_INET ||
1804 filter->family == AF_INET6) &&
1805 x->props.family != filter->family)
1806 return false;
1807
1808 return addr_match(&x->props.saddr, &filter->saddr,
1809 filter->splen) &&
1810 addr_match(&x->id.daddr, &filter->daddr,
1811 filter->dplen);
1812 }
1813 return true;
1814 }
1815
1816 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1817 int (*func)(struct xfrm_state *, int, void*),
1818 void *data)
1819 {
1820 struct xfrm_state *state;
1821 struct xfrm_state_walk *x;
1822 int err = 0;
1823
1824 if (walk->seq != 0 && list_empty(&walk->all))
1825 return 0;
1826
1827 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1828 if (list_empty(&walk->all))
1829 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1830 else
1831 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
1832 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1833 if (x->state == XFRM_STATE_DEAD)
1834 continue;
1835 state = container_of(x, struct xfrm_state, km);
1836 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1837 continue;
1838 if (!__xfrm_state_filter_match(state, walk->filter))
1839 continue;
1840 err = func(state, walk->seq, data);
1841 if (err) {
1842 list_move_tail(&walk->all, &x->all);
1843 goto out;
1844 }
1845 walk->seq++;
1846 }
1847 if (walk->seq == 0) {
1848 err = -ENOENT;
1849 goto out;
1850 }
1851 list_del_init(&walk->all);
1852 out:
1853 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1854 return err;
1855 }
1856 EXPORT_SYMBOL(xfrm_state_walk);
1857
1858 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1859 struct xfrm_address_filter *filter)
1860 {
1861 INIT_LIST_HEAD(&walk->all);
1862 walk->proto = proto;
1863 walk->state = XFRM_STATE_DEAD;
1864 walk->seq = 0;
1865 walk->filter = filter;
1866 }
1867 EXPORT_SYMBOL(xfrm_state_walk_init);
1868
1869 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1870 {
1871 kfree(walk->filter);
1872
1873 if (list_empty(&walk->all))
1874 return;
1875
1876 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1877 list_del(&walk->all);
1878 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1879 }
1880 EXPORT_SYMBOL(xfrm_state_walk_done);
1881
1882 static void xfrm_replay_timer_handler(unsigned long data)
1883 {
1884 struct xfrm_state *x = (struct xfrm_state *)data;
1885
1886 spin_lock(&x->lock);
1887
1888 if (x->km.state == XFRM_STATE_VALID) {
1889 if (xfrm_aevent_is_on(xs_net(x)))
1890 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1891 else
1892 x->xflags |= XFRM_TIME_DEFER;
1893 }
1894
1895 spin_unlock(&x->lock);
1896 }
1897
1898 static LIST_HEAD(xfrm_km_list);
1899
1900 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1901 {
1902 struct xfrm_mgr *km;
1903
1904 rcu_read_lock();
1905 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1906 if (km->notify_policy)
1907 km->notify_policy(xp, dir, c);
1908 rcu_read_unlock();
1909 }
1910
1911 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1912 {
1913 struct xfrm_mgr *km;
1914 rcu_read_lock();
1915 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1916 if (km->notify)
1917 km->notify(x, c);
1918 rcu_read_unlock();
1919 }
1920
1921 EXPORT_SYMBOL(km_policy_notify);
1922 EXPORT_SYMBOL(km_state_notify);
1923
1924 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1925 {
1926 struct km_event c;
1927
1928 c.data.hard = hard;
1929 c.portid = portid;
1930 c.event = XFRM_MSG_EXPIRE;
1931 km_state_notify(x, &c);
1932 }
1933
1934 EXPORT_SYMBOL(km_state_expired);
1935 /*
1936 * We send to all registered managers regardless of failure
1937 * We are happy with one success
1938 */
1939 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1940 {
1941 int err = -EINVAL, acqret;
1942 struct xfrm_mgr *km;
1943
1944 rcu_read_lock();
1945 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1946 acqret = km->acquire(x, t, pol);
1947 if (!acqret)
1948 err = acqret;
1949 }
1950 rcu_read_unlock();
1951 return err;
1952 }
1953 EXPORT_SYMBOL(km_query);
1954
1955 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1956 {
1957 int err = -EINVAL;
1958 struct xfrm_mgr *km;
1959
1960 rcu_read_lock();
1961 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1962 if (km->new_mapping)
1963 err = km->new_mapping(x, ipaddr, sport);
1964 if (!err)
1965 break;
1966 }
1967 rcu_read_unlock();
1968 return err;
1969 }
1970 EXPORT_SYMBOL(km_new_mapping);
1971
1972 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1973 {
1974 struct km_event c;
1975
1976 c.data.hard = hard;
1977 c.portid = portid;
1978 c.event = XFRM_MSG_POLEXPIRE;
1979 km_policy_notify(pol, dir, &c);
1980 }
1981 EXPORT_SYMBOL(km_policy_expired);
1982
1983 #ifdef CONFIG_XFRM_MIGRATE
1984 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1985 const struct xfrm_migrate *m, int num_migrate,
1986 const struct xfrm_kmaddress *k,
1987 const struct xfrm_encap_tmpl *encap)
1988 {
1989 int err = -EINVAL;
1990 int ret;
1991 struct xfrm_mgr *km;
1992
1993 rcu_read_lock();
1994 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1995 if (km->migrate) {
1996 ret = km->migrate(sel, dir, type, m, num_migrate, k,
1997 encap);
1998 if (!ret)
1999 err = ret;
2000 }
2001 }
2002 rcu_read_unlock();
2003 return err;
2004 }
2005 EXPORT_SYMBOL(km_migrate);
2006 #endif
2007
2008 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
2009 {
2010 int err = -EINVAL;
2011 int ret;
2012 struct xfrm_mgr *km;
2013
2014 rcu_read_lock();
2015 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2016 if (km->report) {
2017 ret = km->report(net, proto, sel, addr);
2018 if (!ret)
2019 err = ret;
2020 }
2021 }
2022 rcu_read_unlock();
2023 return err;
2024 }
2025 EXPORT_SYMBOL(km_report);
2026
2027 bool km_is_alive(const struct km_event *c)
2028 {
2029 struct xfrm_mgr *km;
2030 bool is_alive = false;
2031
2032 rcu_read_lock();
2033 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2034 if (km->is_alive && km->is_alive(c)) {
2035 is_alive = true;
2036 break;
2037 }
2038 }
2039 rcu_read_unlock();
2040
2041 return is_alive;
2042 }
2043 EXPORT_SYMBOL(km_is_alive);
2044
2045 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
2046 {
2047 int err;
2048 u8 *data;
2049 struct xfrm_mgr *km;
2050 struct xfrm_policy *pol = NULL;
2051
2052 if (optlen <= 0 || optlen > PAGE_SIZE)
2053 return -EMSGSIZE;
2054
2055 data = memdup_user(optval, optlen);
2056 if (IS_ERR(data))
2057 return PTR_ERR(data);
2058
2059 err = -EINVAL;
2060 rcu_read_lock();
2061 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
2062 pol = km->compile_policy(sk, optname, data,
2063 optlen, &err);
2064 if (err >= 0)
2065 break;
2066 }
2067 rcu_read_unlock();
2068
2069 if (err >= 0) {
2070 xfrm_sk_policy_insert(sk, err, pol);
2071 xfrm_pol_put(pol);
2072 __sk_dst_reset(sk);
2073 err = 0;
2074 }
2075
2076 kfree(data);
2077 return err;
2078 }
2079 EXPORT_SYMBOL(xfrm_user_policy);
2080
2081 static DEFINE_SPINLOCK(xfrm_km_lock);
2082
2083 int xfrm_register_km(struct xfrm_mgr *km)
2084 {
2085 spin_lock_bh(&xfrm_km_lock);
2086 list_add_tail_rcu(&km->list, &xfrm_km_list);
2087 spin_unlock_bh(&xfrm_km_lock);
2088 return 0;
2089 }
2090 EXPORT_SYMBOL(xfrm_register_km);
2091
2092 int xfrm_unregister_km(struct xfrm_mgr *km)
2093 {
2094 spin_lock_bh(&xfrm_km_lock);
2095 list_del_rcu(&km->list);
2096 spin_unlock_bh(&xfrm_km_lock);
2097 synchronize_rcu();
2098 return 0;
2099 }
2100 EXPORT_SYMBOL(xfrm_unregister_km);
2101
2102 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
2103 {
2104 int err = 0;
2105
2106 if (WARN_ON(afinfo->family >= NPROTO))
2107 return -EAFNOSUPPORT;
2108
2109 spin_lock_bh(&xfrm_state_afinfo_lock);
2110 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
2111 err = -EEXIST;
2112 else
2113 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
2114 spin_unlock_bh(&xfrm_state_afinfo_lock);
2115 return err;
2116 }
2117 EXPORT_SYMBOL(xfrm_state_register_afinfo);
2118
2119 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
2120 {
2121 int err = 0, family = afinfo->family;
2122
2123 if (WARN_ON(family >= NPROTO))
2124 return -EAFNOSUPPORT;
2125
2126 spin_lock_bh(&xfrm_state_afinfo_lock);
2127 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
2128 if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
2129 err = -EINVAL;
2130 else
2131 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
2132 }
2133 spin_unlock_bh(&xfrm_state_afinfo_lock);
2134 synchronize_rcu();
2135 return err;
2136 }
2137 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
2138
2139 struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
2140 {
2141 if (unlikely(family >= NPROTO))
2142 return NULL;
2143
2144 return rcu_dereference(xfrm_state_afinfo[family]);
2145 }
2146
2147 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
2148 {
2149 struct xfrm_state_afinfo *afinfo;
2150 if (unlikely(family >= NPROTO))
2151 return NULL;
2152 rcu_read_lock();
2153 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2154 if (unlikely(!afinfo))
2155 rcu_read_unlock();
2156 return afinfo;
2157 }
2158
2159 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
2160 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2161 {
2162 if (x->tunnel) {
2163 struct xfrm_state *t = x->tunnel;
2164
2165 if (atomic_read(&t->tunnel_users) == 2)
2166 xfrm_state_delete(t);
2167 atomic_dec(&t->tunnel_users);
2168 xfrm_state_put(t);
2169 x->tunnel = NULL;
2170 }
2171 }
2172 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2173
2174 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
2175 {
2176 const struct xfrm_type *type = READ_ONCE(x->type);
2177
2178 if (x->km.state == XFRM_STATE_VALID &&
2179 type && type->get_mtu)
2180 return type->get_mtu(x, mtu);
2181
2182 return mtu - x->props.header_len;
2183 }
2184
2185 int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
2186 {
2187 struct xfrm_state_afinfo *afinfo;
2188 struct xfrm_mode *inner_mode;
2189 int family = x->props.family;
2190 int err;
2191
2192 err = -EAFNOSUPPORT;
2193 afinfo = xfrm_state_get_afinfo(family);
2194 if (!afinfo)
2195 goto error;
2196
2197 err = 0;
2198 if (afinfo->init_flags)
2199 err = afinfo->init_flags(x);
2200
2201 rcu_read_unlock();
2202
2203 if (err)
2204 goto error;
2205
2206 err = -EPROTONOSUPPORT;
2207
2208 if (x->sel.family != AF_UNSPEC) {
2209 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2210 if (inner_mode == NULL)
2211 goto error;
2212
2213 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2214 family != x->sel.family) {
2215 xfrm_put_mode(inner_mode);
2216 goto error;
2217 }
2218
2219 x->inner_mode = inner_mode;
2220 } else {
2221 struct xfrm_mode *inner_mode_iaf;
2222 int iafamily = AF_INET;
2223
2224 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2225 if (inner_mode == NULL)
2226 goto error;
2227
2228 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2229 xfrm_put_mode(inner_mode);
2230 goto error;
2231 }
2232 x->inner_mode = inner_mode;
2233
2234 if (x->props.family == AF_INET)
2235 iafamily = AF_INET6;
2236
2237 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2238 if (inner_mode_iaf) {
2239 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2240 x->inner_mode_iaf = inner_mode_iaf;
2241 else
2242 xfrm_put_mode(inner_mode_iaf);
2243 }
2244 }
2245
2246 x->type = xfrm_get_type(x->id.proto, family);
2247 if (x->type == NULL)
2248 goto error;
2249
2250 x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
2251
2252 err = x->type->init_state(x);
2253 if (err)
2254 goto error;
2255
2256 x->outer_mode = xfrm_get_mode(x->props.mode, family);
2257 if (x->outer_mode == NULL) {
2258 err = -EPROTONOSUPPORT;
2259 goto error;
2260 }
2261
2262 if (init_replay) {
2263 err = xfrm_init_replay(x);
2264 if (err)
2265 goto error;
2266 }
2267
2268 x->km.state = XFRM_STATE_VALID;
2269
2270 error:
2271 return err;
2272 }
2273
2274 EXPORT_SYMBOL(__xfrm_init_state);
2275
2276 int xfrm_init_state(struct xfrm_state *x)
2277 {
2278 return __xfrm_init_state(x, true, false);
2279 }
2280
2281 EXPORT_SYMBOL(xfrm_init_state);
2282
2283 int __net_init xfrm_state_init(struct net *net)
2284 {
2285 unsigned int sz;
2286
2287 INIT_LIST_HEAD(&net->xfrm.state_all);
2288
2289 sz = sizeof(struct hlist_head) * 8;
2290
2291 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2292 if (!net->xfrm.state_bydst)
2293 goto out_bydst;
2294 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2295 if (!net->xfrm.state_bysrc)
2296 goto out_bysrc;
2297 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2298 if (!net->xfrm.state_byspi)
2299 goto out_byspi;
2300 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2301
2302 net->xfrm.state_num = 0;
2303 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2304 spin_lock_init(&net->xfrm.xfrm_state_lock);
2305 return 0;
2306
2307 out_byspi:
2308 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2309 out_bysrc:
2310 xfrm_hash_free(net->xfrm.state_bydst, sz);
2311 out_bydst:
2312 return -ENOMEM;
2313 }
2314
2315 void xfrm_state_fini(struct net *net)
2316 {
2317 unsigned int sz;
2318
2319 flush_work(&net->xfrm.state_hash_work);
2320 xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
2321 flush_work(&xfrm_state_gc_work);
2322
2323 WARN_ON(!list_empty(&net->xfrm.state_all));
2324
2325 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2326 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2327 xfrm_hash_free(net->xfrm.state_byspi, sz);
2328 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2329 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2330 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2331 xfrm_hash_free(net->xfrm.state_bydst, sz);
2332 }
2333
2334 #ifdef CONFIG_AUDITSYSCALL
2335 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2336 struct audit_buffer *audit_buf)
2337 {
2338 struct xfrm_sec_ctx *ctx = x->security;
2339 u32 spi = ntohl(x->id.spi);
2340
2341 if (ctx)
2342 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2343 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2344
2345 switch (x->props.family) {
2346 case AF_INET:
2347 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2348 &x->props.saddr.a4, &x->id.daddr.a4);
2349 break;
2350 case AF_INET6:
2351 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2352 x->props.saddr.a6, x->id.daddr.a6);
2353 break;
2354 }
2355
2356 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2357 }
2358
2359 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2360 struct audit_buffer *audit_buf)
2361 {
2362 const struct iphdr *iph4;
2363 const struct ipv6hdr *iph6;
2364
2365 switch (family) {
2366 case AF_INET:
2367 iph4 = ip_hdr(skb);
2368 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2369 &iph4->saddr, &iph4->daddr);
2370 break;
2371 case AF_INET6:
2372 iph6 = ipv6_hdr(skb);
2373 audit_log_format(audit_buf,
2374 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2375 &iph6->saddr, &iph6->daddr,
2376 iph6->flow_lbl[0] & 0x0f,
2377 iph6->flow_lbl[1],
2378 iph6->flow_lbl[2]);
2379 break;
2380 }
2381 }
2382
2383 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2384 {
2385 struct audit_buffer *audit_buf;
2386
2387 audit_buf = xfrm_audit_start("SAD-add");
2388 if (audit_buf == NULL)
2389 return;
2390 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2391 xfrm_audit_helper_sainfo(x, audit_buf);
2392 audit_log_format(audit_buf, " res=%u", result);
2393 audit_log_end(audit_buf);
2394 }
2395 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2396
2397 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2398 {
2399 struct audit_buffer *audit_buf;
2400
2401 audit_buf = xfrm_audit_start("SAD-delete");
2402 if (audit_buf == NULL)
2403 return;
2404 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2405 xfrm_audit_helper_sainfo(x, audit_buf);
2406 audit_log_format(audit_buf, " res=%u", result);
2407 audit_log_end(audit_buf);
2408 }
2409 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2410
2411 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2412 struct sk_buff *skb)
2413 {
2414 struct audit_buffer *audit_buf;
2415 u32 spi;
2416
2417 audit_buf = xfrm_audit_start("SA-replay-overflow");
2418 if (audit_buf == NULL)
2419 return;
2420 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2421 /* don't record the sequence number because it's inherent in this kind
2422 * of audit message */
2423 spi = ntohl(x->id.spi);
2424 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2425 audit_log_end(audit_buf);
2426 }
2427 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2428
2429 void xfrm_audit_state_replay(struct xfrm_state *x,
2430 struct sk_buff *skb, __be32 net_seq)
2431 {
2432 struct audit_buffer *audit_buf;
2433 u32 spi;
2434
2435 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2436 if (audit_buf == NULL)
2437 return;
2438 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2439 spi = ntohl(x->id.spi);
2440 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2441 spi, spi, ntohl(net_seq));
2442 audit_log_end(audit_buf);
2443 }
2444 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2445
2446 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2447 {
2448 struct audit_buffer *audit_buf;
2449
2450 audit_buf = xfrm_audit_start("SA-notfound");
2451 if (audit_buf == NULL)
2452 return;
2453 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2454 audit_log_end(audit_buf);
2455 }
2456 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2457
2458 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2459 __be32 net_spi, __be32 net_seq)
2460 {
2461 struct audit_buffer *audit_buf;
2462 u32 spi;
2463
2464 audit_buf = xfrm_audit_start("SA-notfound");
2465 if (audit_buf == NULL)
2466 return;
2467 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2468 spi = ntohl(net_spi);
2469 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2470 spi, spi, ntohl(net_seq));
2471 audit_log_end(audit_buf);
2472 }
2473 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2474
2475 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2476 struct sk_buff *skb, u8 proto)
2477 {
2478 struct audit_buffer *audit_buf;
2479 __be32 net_spi;
2480 __be32 net_seq;
2481
2482 audit_buf = xfrm_audit_start("SA-icv-failure");
2483 if (audit_buf == NULL)
2484 return;
2485 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2486 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2487 u32 spi = ntohl(net_spi);
2488 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2489 spi, spi, ntohl(net_seq));
2490 }
2491 audit_log_end(audit_buf);
2492 }
2493 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2494 #endif /* CONFIG_AUDITSYSCALL */
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