KEYS: add missing permission check for request_key() destination
[linux/fpc-iii.git] / net / xfrm / xfrm_state.c
blob1f9558155e1e01b3e29a98eb9a4bd0fc14beac8c
1 /*
2 * xfrm_state.c
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
16 #include <linux/workqueue.h>
17 #include <net/xfrm.h>
18 #include <linux/pfkeyv2.h>
19 #include <linux/ipsec.h>
20 #include <linux/module.h>
21 #include <linux/cache.h>
22 #include <linux/audit.h>
23 #include <asm/uaccess.h>
24 #include <linux/ktime.h>
25 #include <linux/slab.h>
26 #include <linux/interrupt.h>
27 #include <linux/kernel.h>
29 #include "xfrm_hash.h"
31 /* Each xfrm_state may be linked to two tables:
33 1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
34 2. Hash table by (daddr,family,reqid) to find what SAs exist for given
35 destination/tunnel endpoint. (output)
38 static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
40 static inline unsigned int xfrm_dst_hash(struct net *net,
41 const xfrm_address_t *daddr,
42 const xfrm_address_t *saddr,
43 u32 reqid,
44 unsigned short family)
46 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
49 static inline unsigned int xfrm_src_hash(struct net *net,
50 const xfrm_address_t *daddr,
51 const xfrm_address_t *saddr,
52 unsigned short family)
54 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
57 static inline unsigned int
58 xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
59 __be32 spi, u8 proto, unsigned short family)
61 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
64 static void xfrm_hash_transfer(struct hlist_head *list,
65 struct hlist_head *ndsttable,
66 struct hlist_head *nsrctable,
67 struct hlist_head *nspitable,
68 unsigned int nhashmask)
70 struct hlist_node *tmp;
71 struct xfrm_state *x;
73 hlist_for_each_entry_safe(x, tmp, list, bydst) {
74 unsigned int h;
76 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
77 x->props.reqid, x->props.family,
78 nhashmask);
79 hlist_add_head(&x->bydst, ndsttable+h);
81 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
82 x->props.family,
83 nhashmask);
84 hlist_add_head(&x->bysrc, nsrctable+h);
86 if (x->id.spi) {
87 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
88 x->id.proto, x->props.family,
89 nhashmask);
90 hlist_add_head(&x->byspi, nspitable+h);
95 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
97 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
100 static DEFINE_MUTEX(hash_resize_mutex);
102 static void xfrm_hash_resize(struct work_struct *work)
104 struct net *net = container_of(work, struct net, xfrm.state_hash_work);
105 struct hlist_head *ndst, *nsrc, *nspi, *odst, *osrc, *ospi;
106 unsigned long nsize, osize;
107 unsigned int nhashmask, ohashmask;
108 int i;
110 mutex_lock(&hash_resize_mutex);
112 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
113 ndst = xfrm_hash_alloc(nsize);
114 if (!ndst)
115 goto out_unlock;
116 nsrc = xfrm_hash_alloc(nsize);
117 if (!nsrc) {
118 xfrm_hash_free(ndst, nsize);
119 goto out_unlock;
121 nspi = xfrm_hash_alloc(nsize);
122 if (!nspi) {
123 xfrm_hash_free(ndst, nsize);
124 xfrm_hash_free(nsrc, nsize);
125 goto out_unlock;
128 spin_lock_bh(&net->xfrm.xfrm_state_lock);
130 nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
131 for (i = net->xfrm.state_hmask; i >= 0; i--)
132 xfrm_hash_transfer(net->xfrm.state_bydst+i, ndst, nsrc, nspi,
133 nhashmask);
135 odst = net->xfrm.state_bydst;
136 osrc = net->xfrm.state_bysrc;
137 ospi = net->xfrm.state_byspi;
138 ohashmask = net->xfrm.state_hmask;
140 net->xfrm.state_bydst = ndst;
141 net->xfrm.state_bysrc = nsrc;
142 net->xfrm.state_byspi = nspi;
143 net->xfrm.state_hmask = nhashmask;
145 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
147 osize = (ohashmask + 1) * sizeof(struct hlist_head);
148 xfrm_hash_free(odst, osize);
149 xfrm_hash_free(osrc, osize);
150 xfrm_hash_free(ospi, osize);
152 out_unlock:
153 mutex_unlock(&hash_resize_mutex);
156 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
157 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
159 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
161 int __xfrm_state_delete(struct xfrm_state *x);
163 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
164 bool km_is_alive(const struct km_event *c);
165 void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
167 static DEFINE_SPINLOCK(xfrm_type_lock);
168 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
170 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
171 const struct xfrm_type **typemap;
172 int err = 0;
174 if (unlikely(afinfo == NULL))
175 return -EAFNOSUPPORT;
176 typemap = afinfo->type_map;
177 spin_lock_bh(&xfrm_type_lock);
179 if (likely(typemap[type->proto] == NULL))
180 typemap[type->proto] = type;
181 else
182 err = -EEXIST;
183 spin_unlock_bh(&xfrm_type_lock);
184 xfrm_state_put_afinfo(afinfo);
185 return err;
187 EXPORT_SYMBOL(xfrm_register_type);
189 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
191 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
192 const struct xfrm_type **typemap;
193 int err = 0;
195 if (unlikely(afinfo == NULL))
196 return -EAFNOSUPPORT;
197 typemap = afinfo->type_map;
198 spin_lock_bh(&xfrm_type_lock);
200 if (unlikely(typemap[type->proto] != type))
201 err = -ENOENT;
202 else
203 typemap[type->proto] = NULL;
204 spin_unlock_bh(&xfrm_type_lock);
205 xfrm_state_put_afinfo(afinfo);
206 return err;
208 EXPORT_SYMBOL(xfrm_unregister_type);
210 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
212 struct xfrm_state_afinfo *afinfo;
213 const struct xfrm_type **typemap;
214 const struct xfrm_type *type;
215 int modload_attempted = 0;
217 retry:
218 afinfo = xfrm_state_get_afinfo(family);
219 if (unlikely(afinfo == NULL))
220 return NULL;
221 typemap = afinfo->type_map;
223 type = typemap[proto];
224 if (unlikely(type && !try_module_get(type->owner)))
225 type = NULL;
226 if (!type && !modload_attempted) {
227 xfrm_state_put_afinfo(afinfo);
228 request_module("xfrm-type-%d-%d", family, proto);
229 modload_attempted = 1;
230 goto retry;
233 xfrm_state_put_afinfo(afinfo);
234 return type;
237 static void xfrm_put_type(const struct xfrm_type *type)
239 module_put(type->owner);
242 static DEFINE_SPINLOCK(xfrm_mode_lock);
243 int xfrm_register_mode(struct xfrm_mode *mode, int family)
245 struct xfrm_state_afinfo *afinfo;
246 struct xfrm_mode **modemap;
247 int err;
249 if (unlikely(mode->encap >= XFRM_MODE_MAX))
250 return -EINVAL;
252 afinfo = xfrm_state_get_afinfo(family);
253 if (unlikely(afinfo == NULL))
254 return -EAFNOSUPPORT;
256 err = -EEXIST;
257 modemap = afinfo->mode_map;
258 spin_lock_bh(&xfrm_mode_lock);
259 if (modemap[mode->encap])
260 goto out;
262 err = -ENOENT;
263 if (!try_module_get(afinfo->owner))
264 goto out;
266 mode->afinfo = afinfo;
267 modemap[mode->encap] = mode;
268 err = 0;
270 out:
271 spin_unlock_bh(&xfrm_mode_lock);
272 xfrm_state_put_afinfo(afinfo);
273 return err;
275 EXPORT_SYMBOL(xfrm_register_mode);
277 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
279 struct xfrm_state_afinfo *afinfo;
280 struct xfrm_mode **modemap;
281 int err;
283 if (unlikely(mode->encap >= XFRM_MODE_MAX))
284 return -EINVAL;
286 afinfo = xfrm_state_get_afinfo(family);
287 if (unlikely(afinfo == NULL))
288 return -EAFNOSUPPORT;
290 err = -ENOENT;
291 modemap = afinfo->mode_map;
292 spin_lock_bh(&xfrm_mode_lock);
293 if (likely(modemap[mode->encap] == mode)) {
294 modemap[mode->encap] = NULL;
295 module_put(mode->afinfo->owner);
296 err = 0;
299 spin_unlock_bh(&xfrm_mode_lock);
300 xfrm_state_put_afinfo(afinfo);
301 return err;
303 EXPORT_SYMBOL(xfrm_unregister_mode);
305 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
307 struct xfrm_state_afinfo *afinfo;
308 struct xfrm_mode *mode;
309 int modload_attempted = 0;
311 if (unlikely(encap >= XFRM_MODE_MAX))
312 return NULL;
314 retry:
315 afinfo = xfrm_state_get_afinfo(family);
316 if (unlikely(afinfo == NULL))
317 return NULL;
319 mode = afinfo->mode_map[encap];
320 if (unlikely(mode && !try_module_get(mode->owner)))
321 mode = NULL;
322 if (!mode && !modload_attempted) {
323 xfrm_state_put_afinfo(afinfo);
324 request_module("xfrm-mode-%d-%d", family, encap);
325 modload_attempted = 1;
326 goto retry;
329 xfrm_state_put_afinfo(afinfo);
330 return mode;
333 static void xfrm_put_mode(struct xfrm_mode *mode)
335 module_put(mode->owner);
338 static void xfrm_state_gc_destroy(struct xfrm_state *x)
340 tasklet_hrtimer_cancel(&x->mtimer);
341 del_timer_sync(&x->rtimer);
342 kfree(x->aead);
343 kfree(x->aalg);
344 kfree(x->ealg);
345 kfree(x->calg);
346 kfree(x->encap);
347 kfree(x->coaddr);
348 kfree(x->replay_esn);
349 kfree(x->preplay_esn);
350 if (x->inner_mode)
351 xfrm_put_mode(x->inner_mode);
352 if (x->inner_mode_iaf)
353 xfrm_put_mode(x->inner_mode_iaf);
354 if (x->outer_mode)
355 xfrm_put_mode(x->outer_mode);
356 if (x->type) {
357 x->type->destructor(x);
358 xfrm_put_type(x->type);
360 security_xfrm_state_free(x);
361 kfree(x);
364 static void xfrm_state_gc_task(struct work_struct *work)
366 struct net *net = container_of(work, struct net, xfrm.state_gc_work);
367 struct xfrm_state *x;
368 struct hlist_node *tmp;
369 struct hlist_head gc_list;
371 spin_lock_bh(&xfrm_state_gc_lock);
372 hlist_move_list(&net->xfrm.state_gc_list, &gc_list);
373 spin_unlock_bh(&xfrm_state_gc_lock);
375 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
376 xfrm_state_gc_destroy(x);
379 static inline unsigned long make_jiffies(long secs)
381 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
382 return MAX_SCHEDULE_TIMEOUT-1;
383 else
384 return secs*HZ;
387 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
389 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
390 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
391 unsigned long now = get_seconds();
392 long next = LONG_MAX;
393 int warn = 0;
394 int err = 0;
396 spin_lock(&x->lock);
397 if (x->km.state == XFRM_STATE_DEAD)
398 goto out;
399 if (x->km.state == XFRM_STATE_EXPIRED)
400 goto expired;
401 if (x->lft.hard_add_expires_seconds) {
402 long tmo = x->lft.hard_add_expires_seconds +
403 x->curlft.add_time - now;
404 if (tmo <= 0) {
405 if (x->xflags & XFRM_SOFT_EXPIRE) {
406 /* enter hard expire without soft expire first?!
407 * setting a new date could trigger this.
408 * workarbound: fix x->curflt.add_time by below:
410 x->curlft.add_time = now - x->saved_tmo - 1;
411 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
412 } else
413 goto expired;
415 if (tmo < next)
416 next = tmo;
418 if (x->lft.hard_use_expires_seconds) {
419 long tmo = x->lft.hard_use_expires_seconds +
420 (x->curlft.use_time ? : now) - now;
421 if (tmo <= 0)
422 goto expired;
423 if (tmo < next)
424 next = tmo;
426 if (x->km.dying)
427 goto resched;
428 if (x->lft.soft_add_expires_seconds) {
429 long tmo = x->lft.soft_add_expires_seconds +
430 x->curlft.add_time - now;
431 if (tmo <= 0) {
432 warn = 1;
433 x->xflags &= ~XFRM_SOFT_EXPIRE;
434 } else if (tmo < next) {
435 next = tmo;
436 x->xflags |= XFRM_SOFT_EXPIRE;
437 x->saved_tmo = tmo;
440 if (x->lft.soft_use_expires_seconds) {
441 long tmo = x->lft.soft_use_expires_seconds +
442 (x->curlft.use_time ? : now) - now;
443 if (tmo <= 0)
444 warn = 1;
445 else if (tmo < next)
446 next = tmo;
449 x->km.dying = warn;
450 if (warn)
451 km_state_expired(x, 0, 0);
452 resched:
453 if (next != LONG_MAX) {
454 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
457 goto out;
459 expired:
460 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
461 x->km.state = XFRM_STATE_EXPIRED;
463 err = __xfrm_state_delete(x);
464 if (!err)
465 km_state_expired(x, 1, 0);
467 xfrm_audit_state_delete(x, err ? 0 : 1, true);
469 out:
470 spin_unlock(&x->lock);
471 return HRTIMER_NORESTART;
474 static void xfrm_replay_timer_handler(unsigned long data);
476 struct xfrm_state *xfrm_state_alloc(struct net *net)
478 struct xfrm_state *x;
480 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
482 if (x) {
483 write_pnet(&x->xs_net, net);
484 atomic_set(&x->refcnt, 1);
485 atomic_set(&x->tunnel_users, 0);
486 INIT_LIST_HEAD(&x->km.all);
487 INIT_HLIST_NODE(&x->bydst);
488 INIT_HLIST_NODE(&x->bysrc);
489 INIT_HLIST_NODE(&x->byspi);
490 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
491 CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
492 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
493 (unsigned long)x);
494 x->curlft.add_time = get_seconds();
495 x->lft.soft_byte_limit = XFRM_INF;
496 x->lft.soft_packet_limit = XFRM_INF;
497 x->lft.hard_byte_limit = XFRM_INF;
498 x->lft.hard_packet_limit = XFRM_INF;
499 x->replay_maxage = 0;
500 x->replay_maxdiff = 0;
501 x->inner_mode = NULL;
502 x->inner_mode_iaf = NULL;
503 spin_lock_init(&x->lock);
505 return x;
507 EXPORT_SYMBOL(xfrm_state_alloc);
509 void __xfrm_state_destroy(struct xfrm_state *x)
511 struct net *net = xs_net(x);
513 WARN_ON(x->km.state != XFRM_STATE_DEAD);
515 spin_lock_bh(&xfrm_state_gc_lock);
516 hlist_add_head(&x->gclist, &net->xfrm.state_gc_list);
517 spin_unlock_bh(&xfrm_state_gc_lock);
518 schedule_work(&net->xfrm.state_gc_work);
520 EXPORT_SYMBOL(__xfrm_state_destroy);
522 int __xfrm_state_delete(struct xfrm_state *x)
524 struct net *net = xs_net(x);
525 int err = -ESRCH;
527 if (x->km.state != XFRM_STATE_DEAD) {
528 x->km.state = XFRM_STATE_DEAD;
529 spin_lock(&net->xfrm.xfrm_state_lock);
530 list_del(&x->km.all);
531 hlist_del(&x->bydst);
532 hlist_del(&x->bysrc);
533 if (x->id.spi)
534 hlist_del(&x->byspi);
535 net->xfrm.state_num--;
536 spin_unlock(&net->xfrm.xfrm_state_lock);
538 /* All xfrm_state objects are created by xfrm_state_alloc.
539 * The xfrm_state_alloc call gives a reference, and that
540 * is what we are dropping here.
542 xfrm_state_put(x);
543 err = 0;
546 return err;
548 EXPORT_SYMBOL(__xfrm_state_delete);
550 int xfrm_state_delete(struct xfrm_state *x)
552 int err;
554 spin_lock_bh(&x->lock);
555 err = __xfrm_state_delete(x);
556 spin_unlock_bh(&x->lock);
558 return err;
560 EXPORT_SYMBOL(xfrm_state_delete);
562 #ifdef CONFIG_SECURITY_NETWORK_XFRM
563 static inline int
564 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
566 int i, err = 0;
568 for (i = 0; i <= net->xfrm.state_hmask; i++) {
569 struct xfrm_state *x;
571 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
572 if (xfrm_id_proto_match(x->id.proto, proto) &&
573 (err = security_xfrm_state_delete(x)) != 0) {
574 xfrm_audit_state_delete(x, 0, task_valid);
575 return err;
580 return err;
582 #else
583 static inline int
584 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
586 return 0;
588 #endif
590 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid)
592 int i, err = 0, cnt = 0;
594 spin_lock_bh(&net->xfrm.xfrm_state_lock);
595 err = xfrm_state_flush_secctx_check(net, proto, task_valid);
596 if (err)
597 goto out;
599 err = -ESRCH;
600 for (i = 0; i <= net->xfrm.state_hmask; i++) {
601 struct xfrm_state *x;
602 restart:
603 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
604 if (!xfrm_state_kern(x) &&
605 xfrm_id_proto_match(x->id.proto, proto)) {
606 xfrm_state_hold(x);
607 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
609 err = xfrm_state_delete(x);
610 xfrm_audit_state_delete(x, err ? 0 : 1,
611 task_valid);
612 xfrm_state_put(x);
613 if (!err)
614 cnt++;
616 spin_lock_bh(&net->xfrm.xfrm_state_lock);
617 goto restart;
621 if (cnt)
622 err = 0;
624 out:
625 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
626 return err;
628 EXPORT_SYMBOL(xfrm_state_flush);
630 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
632 spin_lock_bh(&net->xfrm.xfrm_state_lock);
633 si->sadcnt = net->xfrm.state_num;
634 si->sadhcnt = net->xfrm.state_hmask;
635 si->sadhmcnt = xfrm_state_hashmax;
636 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
638 EXPORT_SYMBOL(xfrm_sad_getinfo);
640 static int
641 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
642 const struct xfrm_tmpl *tmpl,
643 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
644 unsigned short family)
646 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
647 if (!afinfo)
648 return -1;
649 afinfo->init_tempsel(&x->sel, fl);
651 if (family != tmpl->encap_family) {
652 xfrm_state_put_afinfo(afinfo);
653 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
654 if (!afinfo)
655 return -1;
657 afinfo->init_temprop(x, tmpl, daddr, saddr);
658 xfrm_state_put_afinfo(afinfo);
659 return 0;
662 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
663 const xfrm_address_t *daddr,
664 __be32 spi, u8 proto,
665 unsigned short family)
667 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
668 struct xfrm_state *x;
670 hlist_for_each_entry(x, net->xfrm.state_byspi+h, byspi) {
671 if (x->props.family != family ||
672 x->id.spi != spi ||
673 x->id.proto != proto ||
674 !xfrm_addr_equal(&x->id.daddr, daddr, family))
675 continue;
677 if ((mark & x->mark.m) != x->mark.v)
678 continue;
679 xfrm_state_hold(x);
680 return x;
683 return NULL;
686 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
687 const xfrm_address_t *daddr,
688 const xfrm_address_t *saddr,
689 u8 proto, unsigned short family)
691 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
692 struct xfrm_state *x;
694 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
695 if (x->props.family != family ||
696 x->id.proto != proto ||
697 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
698 !xfrm_addr_equal(&x->props.saddr, saddr, family))
699 continue;
701 if ((mark & x->mark.m) != x->mark.v)
702 continue;
703 xfrm_state_hold(x);
704 return x;
707 return NULL;
710 static inline struct xfrm_state *
711 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
713 struct net *net = xs_net(x);
714 u32 mark = x->mark.v & x->mark.m;
716 if (use_spi)
717 return __xfrm_state_lookup(net, mark, &x->id.daddr,
718 x->id.spi, x->id.proto, family);
719 else
720 return __xfrm_state_lookup_byaddr(net, mark,
721 &x->id.daddr,
722 &x->props.saddr,
723 x->id.proto, family);
726 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
728 if (have_hash_collision &&
729 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
730 net->xfrm.state_num > net->xfrm.state_hmask)
731 schedule_work(&net->xfrm.state_hash_work);
734 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
735 const struct flowi *fl, unsigned short family,
736 struct xfrm_state **best, int *acq_in_progress,
737 int *error)
739 /* Resolution logic:
740 * 1. There is a valid state with matching selector. Done.
741 * 2. Valid state with inappropriate selector. Skip.
743 * Entering area of "sysdeps".
745 * 3. If state is not valid, selector is temporary, it selects
746 * only session which triggered previous resolution. Key
747 * manager will do something to install a state with proper
748 * selector.
750 if (x->km.state == XFRM_STATE_VALID) {
751 if ((x->sel.family &&
752 !xfrm_selector_match(&x->sel, fl, x->sel.family)) ||
753 !security_xfrm_state_pol_flow_match(x, pol, fl))
754 return;
756 if (!*best ||
757 (*best)->km.dying > x->km.dying ||
758 ((*best)->km.dying == x->km.dying &&
759 (*best)->curlft.add_time < x->curlft.add_time))
760 *best = x;
761 } else if (x->km.state == XFRM_STATE_ACQ) {
762 *acq_in_progress = 1;
763 } else if (x->km.state == XFRM_STATE_ERROR ||
764 x->km.state == XFRM_STATE_EXPIRED) {
765 if (xfrm_selector_match(&x->sel, fl, x->sel.family) &&
766 security_xfrm_state_pol_flow_match(x, pol, fl))
767 *error = -ESRCH;
771 struct xfrm_state *
772 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
773 const struct flowi *fl, struct xfrm_tmpl *tmpl,
774 struct xfrm_policy *pol, int *err,
775 unsigned short family)
777 static xfrm_address_t saddr_wildcard = { };
778 struct net *net = xp_net(pol);
779 unsigned int h, h_wildcard;
780 struct xfrm_state *x, *x0, *to_put;
781 int acquire_in_progress = 0;
782 int error = 0;
783 struct xfrm_state *best = NULL;
784 u32 mark = pol->mark.v & pol->mark.m;
785 unsigned short encap_family = tmpl->encap_family;
786 struct km_event c;
788 to_put = NULL;
790 spin_lock_bh(&net->xfrm.xfrm_state_lock);
791 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
792 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
793 if (x->props.family == encap_family &&
794 x->props.reqid == tmpl->reqid &&
795 (mark & x->mark.m) == x->mark.v &&
796 !(x->props.flags & XFRM_STATE_WILDRECV) &&
797 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
798 tmpl->mode == x->props.mode &&
799 tmpl->id.proto == x->id.proto &&
800 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
801 xfrm_state_look_at(pol, x, fl, encap_family,
802 &best, &acquire_in_progress, &error);
804 if (best || acquire_in_progress)
805 goto found;
807 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
808 hlist_for_each_entry(x, net->xfrm.state_bydst+h_wildcard, bydst) {
809 if (x->props.family == encap_family &&
810 x->props.reqid == tmpl->reqid &&
811 (mark & x->mark.m) == x->mark.v &&
812 !(x->props.flags & XFRM_STATE_WILDRECV) &&
813 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
814 tmpl->mode == x->props.mode &&
815 tmpl->id.proto == x->id.proto &&
816 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
817 xfrm_state_look_at(pol, x, fl, encap_family,
818 &best, &acquire_in_progress, &error);
821 found:
822 x = best;
823 if (!x && !error && !acquire_in_progress) {
824 if (tmpl->id.spi &&
825 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
826 tmpl->id.proto, encap_family)) != NULL) {
827 to_put = x0;
828 error = -EEXIST;
829 goto out;
832 c.net = net;
833 /* If the KMs have no listeners (yet...), avoid allocating an SA
834 * for each and every packet - garbage collection might not
835 * handle the flood.
837 if (!km_is_alive(&c)) {
838 error = -ESRCH;
839 goto out;
842 x = xfrm_state_alloc(net);
843 if (x == NULL) {
844 error = -ENOMEM;
845 goto out;
847 /* Initialize temporary state matching only
848 * to current session. */
849 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
850 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
852 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
853 if (error) {
854 x->km.state = XFRM_STATE_DEAD;
855 to_put = x;
856 x = NULL;
857 goto out;
860 if (km_query(x, tmpl, pol) == 0) {
861 x->km.state = XFRM_STATE_ACQ;
862 list_add(&x->km.all, &net->xfrm.state_all);
863 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
864 h = xfrm_src_hash(net, daddr, saddr, encap_family);
865 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
866 if (x->id.spi) {
867 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
868 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
870 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
871 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
872 net->xfrm.state_num++;
873 xfrm_hash_grow_check(net, x->bydst.next != NULL);
874 } else {
875 x->km.state = XFRM_STATE_DEAD;
876 to_put = x;
877 x = NULL;
878 error = -ESRCH;
881 out:
882 if (x)
883 xfrm_state_hold(x);
884 else
885 *err = acquire_in_progress ? -EAGAIN : error;
886 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
887 if (to_put)
888 xfrm_state_put(to_put);
889 return x;
892 struct xfrm_state *
893 xfrm_stateonly_find(struct net *net, u32 mark,
894 xfrm_address_t *daddr, xfrm_address_t *saddr,
895 unsigned short family, u8 mode, u8 proto, u32 reqid)
897 unsigned int h;
898 struct xfrm_state *rx = NULL, *x = NULL;
900 spin_lock_bh(&net->xfrm.xfrm_state_lock);
901 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
902 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
903 if (x->props.family == family &&
904 x->props.reqid == reqid &&
905 (mark & x->mark.m) == x->mark.v &&
906 !(x->props.flags & XFRM_STATE_WILDRECV) &&
907 xfrm_state_addr_check(x, daddr, saddr, family) &&
908 mode == x->props.mode &&
909 proto == x->id.proto &&
910 x->km.state == XFRM_STATE_VALID) {
911 rx = x;
912 break;
916 if (rx)
917 xfrm_state_hold(rx);
918 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
921 return rx;
923 EXPORT_SYMBOL(xfrm_stateonly_find);
925 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
926 unsigned short family)
928 struct xfrm_state *x;
929 struct xfrm_state_walk *w;
931 spin_lock_bh(&net->xfrm.xfrm_state_lock);
932 list_for_each_entry(w, &net->xfrm.state_all, all) {
933 x = container_of(w, struct xfrm_state, km);
934 if (x->props.family != family ||
935 x->id.spi != spi)
936 continue;
938 xfrm_state_hold(x);
939 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
940 return x;
942 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
943 return NULL;
945 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
947 static void __xfrm_state_insert(struct xfrm_state *x)
949 struct net *net = xs_net(x);
950 unsigned int h;
952 list_add(&x->km.all, &net->xfrm.state_all);
954 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
955 x->props.reqid, x->props.family);
956 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
958 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
959 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
961 if (x->id.spi) {
962 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
963 x->props.family);
965 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
968 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
969 if (x->replay_maxage)
970 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
972 net->xfrm.state_num++;
974 xfrm_hash_grow_check(net, x->bydst.next != NULL);
977 /* net->xfrm.xfrm_state_lock is held */
978 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
980 struct net *net = xs_net(xnew);
981 unsigned short family = xnew->props.family;
982 u32 reqid = xnew->props.reqid;
983 struct xfrm_state *x;
984 unsigned int h;
985 u32 mark = xnew->mark.v & xnew->mark.m;
987 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
988 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
989 if (x->props.family == family &&
990 x->props.reqid == reqid &&
991 (mark & x->mark.m) == x->mark.v &&
992 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
993 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
994 x->genid++;
998 void xfrm_state_insert(struct xfrm_state *x)
1000 struct net *net = xs_net(x);
1002 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1003 __xfrm_state_bump_genids(x);
1004 __xfrm_state_insert(x);
1005 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1007 EXPORT_SYMBOL(xfrm_state_insert);
1009 /* net->xfrm.xfrm_state_lock is held */
1010 static struct xfrm_state *__find_acq_core(struct net *net,
1011 const struct xfrm_mark *m,
1012 unsigned short family, u8 mode,
1013 u32 reqid, u8 proto,
1014 const xfrm_address_t *daddr,
1015 const xfrm_address_t *saddr,
1016 int create)
1018 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1019 struct xfrm_state *x;
1020 u32 mark = m->v & m->m;
1022 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1023 if (x->props.reqid != reqid ||
1024 x->props.mode != mode ||
1025 x->props.family != family ||
1026 x->km.state != XFRM_STATE_ACQ ||
1027 x->id.spi != 0 ||
1028 x->id.proto != proto ||
1029 (mark & x->mark.m) != x->mark.v ||
1030 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1031 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1032 continue;
1034 xfrm_state_hold(x);
1035 return x;
1038 if (!create)
1039 return NULL;
1041 x = xfrm_state_alloc(net);
1042 if (likely(x)) {
1043 switch (family) {
1044 case AF_INET:
1045 x->sel.daddr.a4 = daddr->a4;
1046 x->sel.saddr.a4 = saddr->a4;
1047 x->sel.prefixlen_d = 32;
1048 x->sel.prefixlen_s = 32;
1049 x->props.saddr.a4 = saddr->a4;
1050 x->id.daddr.a4 = daddr->a4;
1051 break;
1053 case AF_INET6:
1054 *(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr;
1055 *(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr;
1056 x->sel.prefixlen_d = 128;
1057 x->sel.prefixlen_s = 128;
1058 *(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr;
1059 *(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr;
1060 break;
1063 x->km.state = XFRM_STATE_ACQ;
1064 x->id.proto = proto;
1065 x->props.family = family;
1066 x->props.mode = mode;
1067 x->props.reqid = reqid;
1068 x->mark.v = m->v;
1069 x->mark.m = m->m;
1070 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1071 xfrm_state_hold(x);
1072 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1073 list_add(&x->km.all, &net->xfrm.state_all);
1074 hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
1075 h = xfrm_src_hash(net, daddr, saddr, family);
1076 hlist_add_head(&x->bysrc, net->xfrm.state_bysrc+h);
1078 net->xfrm.state_num++;
1080 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1083 return x;
1086 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1088 int xfrm_state_add(struct xfrm_state *x)
1090 struct net *net = xs_net(x);
1091 struct xfrm_state *x1, *to_put;
1092 int family;
1093 int err;
1094 u32 mark = x->mark.v & x->mark.m;
1095 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1097 family = x->props.family;
1099 to_put = NULL;
1101 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1103 x1 = __xfrm_state_locate(x, use_spi, family);
1104 if (x1) {
1105 to_put = x1;
1106 x1 = NULL;
1107 err = -EEXIST;
1108 goto out;
1111 if (use_spi && x->km.seq) {
1112 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1113 if (x1 && ((x1->id.proto != x->id.proto) ||
1114 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1115 to_put = x1;
1116 x1 = NULL;
1120 if (use_spi && !x1)
1121 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1122 x->props.reqid, x->id.proto,
1123 &x->id.daddr, &x->props.saddr, 0);
1125 __xfrm_state_bump_genids(x);
1126 __xfrm_state_insert(x);
1127 err = 0;
1129 out:
1130 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1132 if (x1) {
1133 xfrm_state_delete(x1);
1134 xfrm_state_put(x1);
1137 if (to_put)
1138 xfrm_state_put(to_put);
1140 return err;
1142 EXPORT_SYMBOL(xfrm_state_add);
1144 #ifdef CONFIG_XFRM_MIGRATE
1145 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig)
1147 struct net *net = xs_net(orig);
1148 struct xfrm_state *x = xfrm_state_alloc(net);
1149 if (!x)
1150 goto out;
1152 memcpy(&x->id, &orig->id, sizeof(x->id));
1153 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1154 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1155 x->props.mode = orig->props.mode;
1156 x->props.replay_window = orig->props.replay_window;
1157 x->props.reqid = orig->props.reqid;
1158 x->props.family = orig->props.family;
1159 x->props.saddr = orig->props.saddr;
1161 if (orig->aalg) {
1162 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1163 if (!x->aalg)
1164 goto error;
1166 x->props.aalgo = orig->props.aalgo;
1168 if (orig->aead) {
1169 x->aead = xfrm_algo_aead_clone(orig->aead);
1170 if (!x->aead)
1171 goto error;
1173 if (orig->ealg) {
1174 x->ealg = xfrm_algo_clone(orig->ealg);
1175 if (!x->ealg)
1176 goto error;
1178 x->props.ealgo = orig->props.ealgo;
1180 if (orig->calg) {
1181 x->calg = xfrm_algo_clone(orig->calg);
1182 if (!x->calg)
1183 goto error;
1185 x->props.calgo = orig->props.calgo;
1187 if (orig->encap) {
1188 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1189 if (!x->encap)
1190 goto error;
1193 if (orig->coaddr) {
1194 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1195 GFP_KERNEL);
1196 if (!x->coaddr)
1197 goto error;
1200 if (orig->replay_esn) {
1201 if (xfrm_replay_clone(x, orig))
1202 goto error;
1205 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1207 if (xfrm_init_state(x) < 0)
1208 goto error;
1210 x->props.flags = orig->props.flags;
1211 x->props.extra_flags = orig->props.extra_flags;
1213 x->tfcpad = orig->tfcpad;
1214 x->replay_maxdiff = orig->replay_maxdiff;
1215 x->replay_maxage = orig->replay_maxage;
1216 x->curlft.add_time = orig->curlft.add_time;
1217 x->km.state = orig->km.state;
1218 x->km.seq = orig->km.seq;
1220 return x;
1222 error:
1223 xfrm_state_put(x);
1224 out:
1225 return NULL;
1228 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1230 unsigned int h;
1231 struct xfrm_state *x = NULL;
1233 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1235 if (m->reqid) {
1236 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1237 m->reqid, m->old_family);
1238 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1239 if (x->props.mode != m->mode ||
1240 x->id.proto != m->proto)
1241 continue;
1242 if (m->reqid && x->props.reqid != m->reqid)
1243 continue;
1244 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1245 m->old_family) ||
1246 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1247 m->old_family))
1248 continue;
1249 xfrm_state_hold(x);
1250 break;
1252 } else {
1253 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1254 m->old_family);
1255 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1256 if (x->props.mode != m->mode ||
1257 x->id.proto != m->proto)
1258 continue;
1259 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1260 m->old_family) ||
1261 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1262 m->old_family))
1263 continue;
1264 xfrm_state_hold(x);
1265 break;
1269 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1271 return x;
1273 EXPORT_SYMBOL(xfrm_migrate_state_find);
1275 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1276 struct xfrm_migrate *m)
1278 struct xfrm_state *xc;
1280 xc = xfrm_state_clone(x);
1281 if (!xc)
1282 return NULL;
1284 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1285 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1287 /* add state */
1288 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1289 /* a care is needed when the destination address of the
1290 state is to be updated as it is a part of triplet */
1291 xfrm_state_insert(xc);
1292 } else {
1293 if (xfrm_state_add(xc) < 0)
1294 goto error;
1297 return xc;
1298 error:
1299 xfrm_state_put(xc);
1300 return NULL;
1302 EXPORT_SYMBOL(xfrm_state_migrate);
1303 #endif
1305 int xfrm_state_update(struct xfrm_state *x)
1307 struct xfrm_state *x1, *to_put;
1308 int err;
1309 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1310 struct net *net = xs_net(x);
1312 to_put = NULL;
1314 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1315 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1317 err = -ESRCH;
1318 if (!x1)
1319 goto out;
1321 if (xfrm_state_kern(x1)) {
1322 to_put = x1;
1323 err = -EEXIST;
1324 goto out;
1327 if (x1->km.state == XFRM_STATE_ACQ) {
1328 __xfrm_state_insert(x);
1329 x = NULL;
1331 err = 0;
1333 out:
1334 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1336 if (to_put)
1337 xfrm_state_put(to_put);
1339 if (err)
1340 return err;
1342 if (!x) {
1343 xfrm_state_delete(x1);
1344 xfrm_state_put(x1);
1345 return 0;
1348 err = -EINVAL;
1349 spin_lock_bh(&x1->lock);
1350 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1351 if (x->encap && x1->encap)
1352 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1353 if (x->coaddr && x1->coaddr) {
1354 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1356 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1357 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1358 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1359 x1->km.dying = 0;
1361 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1362 if (x1->curlft.use_time)
1363 xfrm_state_check_expire(x1);
1365 err = 0;
1366 x->km.state = XFRM_STATE_DEAD;
1367 __xfrm_state_put(x);
1369 spin_unlock_bh(&x1->lock);
1371 xfrm_state_put(x1);
1373 return err;
1375 EXPORT_SYMBOL(xfrm_state_update);
1377 int xfrm_state_check_expire(struct xfrm_state *x)
1379 if (!x->curlft.use_time)
1380 x->curlft.use_time = get_seconds();
1382 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1383 x->curlft.packets >= x->lft.hard_packet_limit) {
1384 x->km.state = XFRM_STATE_EXPIRED;
1385 tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL);
1386 return -EINVAL;
1389 if (!x->km.dying &&
1390 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1391 x->curlft.packets >= x->lft.soft_packet_limit)) {
1392 x->km.dying = 1;
1393 km_state_expired(x, 0, 0);
1395 return 0;
1397 EXPORT_SYMBOL(xfrm_state_check_expire);
1399 struct xfrm_state *
1400 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1401 u8 proto, unsigned short family)
1403 struct xfrm_state *x;
1405 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1406 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1407 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1408 return x;
1410 EXPORT_SYMBOL(xfrm_state_lookup);
1412 struct xfrm_state *
1413 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1414 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1415 u8 proto, unsigned short family)
1417 struct xfrm_state *x;
1419 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1420 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1421 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1422 return x;
1424 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1426 struct xfrm_state *
1427 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1428 u8 proto, const xfrm_address_t *daddr,
1429 const xfrm_address_t *saddr, int create, unsigned short family)
1431 struct xfrm_state *x;
1433 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1434 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1435 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1437 return x;
1439 EXPORT_SYMBOL(xfrm_find_acq);
1441 #ifdef CONFIG_XFRM_SUB_POLICY
1443 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1444 unsigned short family, struct net *net)
1446 int err = 0;
1447 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1448 if (!afinfo)
1449 return -EAFNOSUPPORT;
1451 spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1452 if (afinfo->tmpl_sort)
1453 err = afinfo->tmpl_sort(dst, src, n);
1454 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1455 xfrm_state_put_afinfo(afinfo);
1456 return err;
1458 EXPORT_SYMBOL(xfrm_tmpl_sort);
1461 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1462 unsigned short family)
1464 int err = 0;
1465 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1466 struct net *net = xs_net(*src);
1468 if (!afinfo)
1469 return -EAFNOSUPPORT;
1471 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1472 if (afinfo->state_sort)
1473 err = afinfo->state_sort(dst, src, n);
1474 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1475 xfrm_state_put_afinfo(afinfo);
1476 return err;
1478 EXPORT_SYMBOL(xfrm_state_sort);
1479 #endif
1481 /* Silly enough, but I'm lazy to build resolution list */
1483 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1485 int i;
1487 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1488 struct xfrm_state *x;
1490 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1491 if (x->km.seq == seq &&
1492 (mark & x->mark.m) == x->mark.v &&
1493 x->km.state == XFRM_STATE_ACQ) {
1494 xfrm_state_hold(x);
1495 return x;
1499 return NULL;
1502 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1504 struct xfrm_state *x;
1506 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1507 x = __xfrm_find_acq_byseq(net, mark, seq);
1508 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1509 return x;
1511 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1513 u32 xfrm_get_acqseq(void)
1515 u32 res;
1516 static atomic_t acqseq;
1518 do {
1519 res = atomic_inc_return(&acqseq);
1520 } while (!res);
1522 return res;
1524 EXPORT_SYMBOL(xfrm_get_acqseq);
1526 int verify_spi_info(u8 proto, u32 min, u32 max)
1528 switch (proto) {
1529 case IPPROTO_AH:
1530 case IPPROTO_ESP:
1531 break;
1533 case IPPROTO_COMP:
1534 /* IPCOMP spi is 16-bits. */
1535 if (max >= 0x10000)
1536 return -EINVAL;
1537 break;
1539 default:
1540 return -EINVAL;
1543 if (min > max)
1544 return -EINVAL;
1546 return 0;
1548 EXPORT_SYMBOL(verify_spi_info);
1550 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1552 struct net *net = xs_net(x);
1553 unsigned int h;
1554 struct xfrm_state *x0;
1555 int err = -ENOENT;
1556 __be32 minspi = htonl(low);
1557 __be32 maxspi = htonl(high);
1558 u32 mark = x->mark.v & x->mark.m;
1560 spin_lock_bh(&x->lock);
1561 if (x->km.state == XFRM_STATE_DEAD)
1562 goto unlock;
1564 err = 0;
1565 if (x->id.spi)
1566 goto unlock;
1568 err = -ENOENT;
1570 if (minspi == maxspi) {
1571 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1572 if (x0) {
1573 xfrm_state_put(x0);
1574 goto unlock;
1576 x->id.spi = minspi;
1577 } else {
1578 u32 spi = 0;
1579 for (h = 0; h < high-low+1; h++) {
1580 spi = low + prandom_u32()%(high-low+1);
1581 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1582 if (x0 == NULL) {
1583 x->id.spi = htonl(spi);
1584 break;
1586 xfrm_state_put(x0);
1589 if (x->id.spi) {
1590 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1591 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1592 hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
1593 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1595 err = 0;
1598 unlock:
1599 spin_unlock_bh(&x->lock);
1601 return err;
1603 EXPORT_SYMBOL(xfrm_alloc_spi);
1605 static bool __xfrm_state_filter_match(struct xfrm_state *x,
1606 struct xfrm_address_filter *filter)
1608 if (filter) {
1609 if ((filter->family == AF_INET ||
1610 filter->family == AF_INET6) &&
1611 x->props.family != filter->family)
1612 return false;
1614 return addr_match(&x->props.saddr, &filter->saddr,
1615 filter->splen) &&
1616 addr_match(&x->id.daddr, &filter->daddr,
1617 filter->dplen);
1619 return true;
1622 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1623 int (*func)(struct xfrm_state *, int, void*),
1624 void *data)
1626 struct xfrm_state *state;
1627 struct xfrm_state_walk *x;
1628 int err = 0;
1630 if (walk->seq != 0 && list_empty(&walk->all))
1631 return 0;
1633 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1634 if (list_empty(&walk->all))
1635 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1636 else
1637 x = list_entry(&walk->all, struct xfrm_state_walk, all);
1638 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1639 if (x->state == XFRM_STATE_DEAD)
1640 continue;
1641 state = container_of(x, struct xfrm_state, km);
1642 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1643 continue;
1644 if (!__xfrm_state_filter_match(state, walk->filter))
1645 continue;
1646 err = func(state, walk->seq, data);
1647 if (err) {
1648 list_move_tail(&walk->all, &x->all);
1649 goto out;
1651 walk->seq++;
1653 if (walk->seq == 0) {
1654 err = -ENOENT;
1655 goto out;
1657 list_del_init(&walk->all);
1658 out:
1659 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1660 return err;
1662 EXPORT_SYMBOL(xfrm_state_walk);
1664 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1665 struct xfrm_address_filter *filter)
1667 INIT_LIST_HEAD(&walk->all);
1668 walk->proto = proto;
1669 walk->state = XFRM_STATE_DEAD;
1670 walk->seq = 0;
1671 walk->filter = filter;
1673 EXPORT_SYMBOL(xfrm_state_walk_init);
1675 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1677 kfree(walk->filter);
1679 if (list_empty(&walk->all))
1680 return;
1682 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1683 list_del(&walk->all);
1684 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1686 EXPORT_SYMBOL(xfrm_state_walk_done);
1688 static void xfrm_replay_timer_handler(unsigned long data)
1690 struct xfrm_state *x = (struct xfrm_state *)data;
1692 spin_lock(&x->lock);
1694 if (x->km.state == XFRM_STATE_VALID) {
1695 if (xfrm_aevent_is_on(xs_net(x)))
1696 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1697 else
1698 x->xflags |= XFRM_TIME_DEFER;
1701 spin_unlock(&x->lock);
1704 static LIST_HEAD(xfrm_km_list);
1706 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1708 struct xfrm_mgr *km;
1710 rcu_read_lock();
1711 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1712 if (km->notify_policy)
1713 km->notify_policy(xp, dir, c);
1714 rcu_read_unlock();
1717 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1719 struct xfrm_mgr *km;
1720 rcu_read_lock();
1721 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1722 if (km->notify)
1723 km->notify(x, c);
1724 rcu_read_unlock();
1727 EXPORT_SYMBOL(km_policy_notify);
1728 EXPORT_SYMBOL(km_state_notify);
1730 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1732 struct km_event c;
1734 c.data.hard = hard;
1735 c.portid = portid;
1736 c.event = XFRM_MSG_EXPIRE;
1737 km_state_notify(x, &c);
1740 EXPORT_SYMBOL(km_state_expired);
1742 * We send to all registered managers regardless of failure
1743 * We are happy with one success
1745 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1747 int err = -EINVAL, acqret;
1748 struct xfrm_mgr *km;
1750 rcu_read_lock();
1751 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1752 acqret = km->acquire(x, t, pol);
1753 if (!acqret)
1754 err = acqret;
1756 rcu_read_unlock();
1757 return err;
1759 EXPORT_SYMBOL(km_query);
1761 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1763 int err = -EINVAL;
1764 struct xfrm_mgr *km;
1766 rcu_read_lock();
1767 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1768 if (km->new_mapping)
1769 err = km->new_mapping(x, ipaddr, sport);
1770 if (!err)
1771 break;
1773 rcu_read_unlock();
1774 return err;
1776 EXPORT_SYMBOL(km_new_mapping);
1778 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1780 struct km_event c;
1782 c.data.hard = hard;
1783 c.portid = portid;
1784 c.event = XFRM_MSG_POLEXPIRE;
1785 km_policy_notify(pol, dir, &c);
1787 EXPORT_SYMBOL(km_policy_expired);
1789 #ifdef CONFIG_XFRM_MIGRATE
1790 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1791 const struct xfrm_migrate *m, int num_migrate,
1792 const struct xfrm_kmaddress *k)
1794 int err = -EINVAL;
1795 int ret;
1796 struct xfrm_mgr *km;
1798 rcu_read_lock();
1799 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1800 if (km->migrate) {
1801 ret = km->migrate(sel, dir, type, m, num_migrate, k);
1802 if (!ret)
1803 err = ret;
1806 rcu_read_unlock();
1807 return err;
1809 EXPORT_SYMBOL(km_migrate);
1810 #endif
1812 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1814 int err = -EINVAL;
1815 int ret;
1816 struct xfrm_mgr *km;
1818 rcu_read_lock();
1819 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1820 if (km->report) {
1821 ret = km->report(net, proto, sel, addr);
1822 if (!ret)
1823 err = ret;
1826 rcu_read_unlock();
1827 return err;
1829 EXPORT_SYMBOL(km_report);
1831 bool km_is_alive(const struct km_event *c)
1833 struct xfrm_mgr *km;
1834 bool is_alive = false;
1836 rcu_read_lock();
1837 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1838 if (km->is_alive && km->is_alive(c)) {
1839 is_alive = true;
1840 break;
1843 rcu_read_unlock();
1845 return is_alive;
1847 EXPORT_SYMBOL(km_is_alive);
1849 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1851 int err;
1852 u8 *data;
1853 struct xfrm_mgr *km;
1854 struct xfrm_policy *pol = NULL;
1856 if (optlen <= 0 || optlen > PAGE_SIZE)
1857 return -EMSGSIZE;
1859 data = kmalloc(optlen, GFP_KERNEL);
1860 if (!data)
1861 return -ENOMEM;
1863 err = -EFAULT;
1864 if (copy_from_user(data, optval, optlen))
1865 goto out;
1867 err = -EINVAL;
1868 rcu_read_lock();
1869 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1870 pol = km->compile_policy(sk, optname, data,
1871 optlen, &err);
1872 if (err >= 0)
1873 break;
1875 rcu_read_unlock();
1877 if (err >= 0) {
1878 xfrm_sk_policy_insert(sk, err, pol);
1879 xfrm_pol_put(pol);
1880 __sk_dst_reset(sk);
1881 err = 0;
1884 out:
1885 kfree(data);
1886 return err;
1888 EXPORT_SYMBOL(xfrm_user_policy);
1890 static DEFINE_SPINLOCK(xfrm_km_lock);
1892 int xfrm_register_km(struct xfrm_mgr *km)
1894 spin_lock_bh(&xfrm_km_lock);
1895 list_add_tail_rcu(&km->list, &xfrm_km_list);
1896 spin_unlock_bh(&xfrm_km_lock);
1897 return 0;
1899 EXPORT_SYMBOL(xfrm_register_km);
1901 int xfrm_unregister_km(struct xfrm_mgr *km)
1903 spin_lock_bh(&xfrm_km_lock);
1904 list_del_rcu(&km->list);
1905 spin_unlock_bh(&xfrm_km_lock);
1906 synchronize_rcu();
1907 return 0;
1909 EXPORT_SYMBOL(xfrm_unregister_km);
1911 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1913 int err = 0;
1914 if (unlikely(afinfo == NULL))
1915 return -EINVAL;
1916 if (unlikely(afinfo->family >= NPROTO))
1917 return -EAFNOSUPPORT;
1918 spin_lock_bh(&xfrm_state_afinfo_lock);
1919 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1920 err = -ENOBUFS;
1921 else
1922 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1923 spin_unlock_bh(&xfrm_state_afinfo_lock);
1924 return err;
1926 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1928 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1930 int err = 0;
1931 if (unlikely(afinfo == NULL))
1932 return -EINVAL;
1933 if (unlikely(afinfo->family >= NPROTO))
1934 return -EAFNOSUPPORT;
1935 spin_lock_bh(&xfrm_state_afinfo_lock);
1936 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1937 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1938 err = -EINVAL;
1939 else
1940 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1942 spin_unlock_bh(&xfrm_state_afinfo_lock);
1943 synchronize_rcu();
1944 return err;
1946 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1948 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1950 struct xfrm_state_afinfo *afinfo;
1951 if (unlikely(family >= NPROTO))
1952 return NULL;
1953 rcu_read_lock();
1954 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
1955 if (unlikely(!afinfo))
1956 rcu_read_unlock();
1957 return afinfo;
1960 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
1962 rcu_read_unlock();
1965 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
1966 void xfrm_state_delete_tunnel(struct xfrm_state *x)
1968 if (x->tunnel) {
1969 struct xfrm_state *t = x->tunnel;
1971 if (atomic_read(&t->tunnel_users) == 2)
1972 xfrm_state_delete(t);
1973 atomic_dec(&t->tunnel_users);
1974 xfrm_state_put(t);
1975 x->tunnel = NULL;
1978 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
1980 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
1982 int res;
1984 spin_lock_bh(&x->lock);
1985 if (x->km.state == XFRM_STATE_VALID &&
1986 x->type && x->type->get_mtu)
1987 res = x->type->get_mtu(x, mtu);
1988 else
1989 res = mtu - x->props.header_len;
1990 spin_unlock_bh(&x->lock);
1991 return res;
1994 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
1996 struct xfrm_state_afinfo *afinfo;
1997 struct xfrm_mode *inner_mode;
1998 int family = x->props.family;
1999 int err;
2001 err = -EAFNOSUPPORT;
2002 afinfo = xfrm_state_get_afinfo(family);
2003 if (!afinfo)
2004 goto error;
2006 err = 0;
2007 if (afinfo->init_flags)
2008 err = afinfo->init_flags(x);
2010 xfrm_state_put_afinfo(afinfo);
2012 if (err)
2013 goto error;
2015 err = -EPROTONOSUPPORT;
2017 if (x->sel.family != AF_UNSPEC) {
2018 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2019 if (inner_mode == NULL)
2020 goto error;
2022 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2023 family != x->sel.family) {
2024 xfrm_put_mode(inner_mode);
2025 goto error;
2028 x->inner_mode = inner_mode;
2029 } else {
2030 struct xfrm_mode *inner_mode_iaf;
2031 int iafamily = AF_INET;
2033 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2034 if (inner_mode == NULL)
2035 goto error;
2037 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2038 xfrm_put_mode(inner_mode);
2039 goto error;
2041 x->inner_mode = inner_mode;
2043 if (x->props.family == AF_INET)
2044 iafamily = AF_INET6;
2046 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2047 if (inner_mode_iaf) {
2048 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2049 x->inner_mode_iaf = inner_mode_iaf;
2050 else
2051 xfrm_put_mode(inner_mode_iaf);
2055 x->type = xfrm_get_type(x->id.proto, family);
2056 if (x->type == NULL)
2057 goto error;
2059 err = x->type->init_state(x);
2060 if (err)
2061 goto error;
2063 x->outer_mode = xfrm_get_mode(x->props.mode, family);
2064 if (x->outer_mode == NULL) {
2065 err = -EPROTONOSUPPORT;
2066 goto error;
2069 if (init_replay) {
2070 err = xfrm_init_replay(x);
2071 if (err)
2072 goto error;
2075 x->km.state = XFRM_STATE_VALID;
2077 error:
2078 return err;
2081 EXPORT_SYMBOL(__xfrm_init_state);
2083 int xfrm_init_state(struct xfrm_state *x)
2085 return __xfrm_init_state(x, true);
2088 EXPORT_SYMBOL(xfrm_init_state);
2090 int __net_init xfrm_state_init(struct net *net)
2092 unsigned int sz;
2094 INIT_LIST_HEAD(&net->xfrm.state_all);
2096 sz = sizeof(struct hlist_head) * 8;
2098 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2099 if (!net->xfrm.state_bydst)
2100 goto out_bydst;
2101 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2102 if (!net->xfrm.state_bysrc)
2103 goto out_bysrc;
2104 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2105 if (!net->xfrm.state_byspi)
2106 goto out_byspi;
2107 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2109 net->xfrm.state_num = 0;
2110 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2111 INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
2112 INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
2113 spin_lock_init(&net->xfrm.xfrm_state_lock);
2114 return 0;
2116 out_byspi:
2117 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2118 out_bysrc:
2119 xfrm_hash_free(net->xfrm.state_bydst, sz);
2120 out_bydst:
2121 return -ENOMEM;
2124 void xfrm_state_fini(struct net *net)
2126 unsigned int sz;
2128 flush_work(&net->xfrm.state_hash_work);
2129 xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
2130 flush_work(&net->xfrm.state_gc_work);
2132 WARN_ON(!list_empty(&net->xfrm.state_all));
2134 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2135 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2136 xfrm_hash_free(net->xfrm.state_byspi, sz);
2137 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2138 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2139 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2140 xfrm_hash_free(net->xfrm.state_bydst, sz);
2143 #ifdef CONFIG_AUDITSYSCALL
2144 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2145 struct audit_buffer *audit_buf)
2147 struct xfrm_sec_ctx *ctx = x->security;
2148 u32 spi = ntohl(x->id.spi);
2150 if (ctx)
2151 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2152 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2154 switch (x->props.family) {
2155 case AF_INET:
2156 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2157 &x->props.saddr.a4, &x->id.daddr.a4);
2158 break;
2159 case AF_INET6:
2160 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2161 x->props.saddr.a6, x->id.daddr.a6);
2162 break;
2165 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2168 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2169 struct audit_buffer *audit_buf)
2171 const struct iphdr *iph4;
2172 const struct ipv6hdr *iph6;
2174 switch (family) {
2175 case AF_INET:
2176 iph4 = ip_hdr(skb);
2177 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2178 &iph4->saddr, &iph4->daddr);
2179 break;
2180 case AF_INET6:
2181 iph6 = ipv6_hdr(skb);
2182 audit_log_format(audit_buf,
2183 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2184 &iph6->saddr, &iph6->daddr,
2185 iph6->flow_lbl[0] & 0x0f,
2186 iph6->flow_lbl[1],
2187 iph6->flow_lbl[2]);
2188 break;
2192 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2194 struct audit_buffer *audit_buf;
2196 audit_buf = xfrm_audit_start("SAD-add");
2197 if (audit_buf == NULL)
2198 return;
2199 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2200 xfrm_audit_helper_sainfo(x, audit_buf);
2201 audit_log_format(audit_buf, " res=%u", result);
2202 audit_log_end(audit_buf);
2204 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2206 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2208 struct audit_buffer *audit_buf;
2210 audit_buf = xfrm_audit_start("SAD-delete");
2211 if (audit_buf == NULL)
2212 return;
2213 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2214 xfrm_audit_helper_sainfo(x, audit_buf);
2215 audit_log_format(audit_buf, " res=%u", result);
2216 audit_log_end(audit_buf);
2218 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2220 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2221 struct sk_buff *skb)
2223 struct audit_buffer *audit_buf;
2224 u32 spi;
2226 audit_buf = xfrm_audit_start("SA-replay-overflow");
2227 if (audit_buf == NULL)
2228 return;
2229 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2230 /* don't record the sequence number because it's inherent in this kind
2231 * of audit message */
2232 spi = ntohl(x->id.spi);
2233 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2234 audit_log_end(audit_buf);
2236 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2238 void xfrm_audit_state_replay(struct xfrm_state *x,
2239 struct sk_buff *skb, __be32 net_seq)
2241 struct audit_buffer *audit_buf;
2242 u32 spi;
2244 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2245 if (audit_buf == NULL)
2246 return;
2247 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2248 spi = ntohl(x->id.spi);
2249 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2250 spi, spi, ntohl(net_seq));
2251 audit_log_end(audit_buf);
2253 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2255 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2257 struct audit_buffer *audit_buf;
2259 audit_buf = xfrm_audit_start("SA-notfound");
2260 if (audit_buf == NULL)
2261 return;
2262 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2263 audit_log_end(audit_buf);
2265 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2267 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2268 __be32 net_spi, __be32 net_seq)
2270 struct audit_buffer *audit_buf;
2271 u32 spi;
2273 audit_buf = xfrm_audit_start("SA-notfound");
2274 if (audit_buf == NULL)
2275 return;
2276 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2277 spi = ntohl(net_spi);
2278 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2279 spi, spi, ntohl(net_seq));
2280 audit_log_end(audit_buf);
2282 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2284 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2285 struct sk_buff *skb, u8 proto)
2287 struct audit_buffer *audit_buf;
2288 __be32 net_spi;
2289 __be32 net_seq;
2291 audit_buf = xfrm_audit_start("SA-icv-failure");
2292 if (audit_buf == NULL)
2293 return;
2294 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2295 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2296 u32 spi = ntohl(net_spi);
2297 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2298 spi, spi, ntohl(net_seq));
2300 audit_log_end(audit_buf);
2302 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2303 #endif /* CONFIG_AUDITSYSCALL */