6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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>
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 #define xfrm_state_deref_prot(table, net) \
32 rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
34 static void xfrm_state_gc_task(struct work_struct *work);
36 /* Each xfrm_state may be linked to two tables:
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)
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);
46 static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
47 static HLIST_HEAD(xfrm_state_gc_list);
49 static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
51 return atomic_inc_not_zero(&x->refcnt);
54 static inline unsigned int xfrm_dst_hash(struct net *net,
55 const xfrm_address_t *daddr,
56 const xfrm_address_t *saddr,
58 unsigned short family)
60 return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
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)
68 return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
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)
75 return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
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)
84 struct hlist_node *tmp;
87 hlist_for_each_entry_safe(x, tmp, list, bydst) {
90 h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
91 x->props.reqid, x->props.family,
93 hlist_add_head_rcu(&x->bydst, ndsttable + h);
95 h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
98 hlist_add_head_rcu(&x->bysrc, nsrctable + h);
101 h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
102 x->id.proto, x->props.family,
104 hlist_add_head_rcu(&x->byspi, nspitable + h);
109 static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
111 return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
114 static void xfrm_hash_resize(struct work_struct *work)
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;
122 nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
123 ndst = xfrm_hash_alloc(nsize);
126 nsrc = xfrm_hash_alloc(nsize);
128 xfrm_hash_free(ndst, nsize);
131 nspi = xfrm_hash_alloc(nsize);
133 xfrm_hash_free(ndst, nsize);
134 xfrm_hash_free(nsrc, nsize);
138 spin_lock_bh(&net->xfrm.xfrm_state_lock);
139 write_seqcount_begin(&xfrm_state_hash_generation);
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);
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;
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;
155 write_seqcount_end(&xfrm_state_hash_generation);
156 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
158 osize = (ohashmask + 1) * sizeof(struct hlist_head);
162 xfrm_hash_free(odst, osize);
163 xfrm_hash_free(osrc, osize);
164 xfrm_hash_free(ospi, osize);
167 static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
168 static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
170 static DEFINE_SPINLOCK(xfrm_state_gc_lock);
172 int __xfrm_state_delete(struct xfrm_state *x);
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);
178 static DEFINE_SPINLOCK(xfrm_type_lock);
179 int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
181 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
182 const struct xfrm_type **typemap;
185 if (unlikely(afinfo == NULL))
186 return -EAFNOSUPPORT;
187 typemap = afinfo->type_map;
188 spin_lock_bh(&xfrm_type_lock);
190 if (likely(typemap[type->proto] == NULL))
191 typemap[type->proto] = type;
194 spin_unlock_bh(&xfrm_type_lock);
195 xfrm_state_put_afinfo(afinfo);
198 EXPORT_SYMBOL(xfrm_register_type);
200 int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
202 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
203 const struct xfrm_type **typemap;
206 if (unlikely(afinfo == NULL))
207 return -EAFNOSUPPORT;
208 typemap = afinfo->type_map;
209 spin_lock_bh(&xfrm_type_lock);
211 if (unlikely(typemap[type->proto] != type))
214 typemap[type->proto] = NULL;
215 spin_unlock_bh(&xfrm_type_lock);
216 xfrm_state_put_afinfo(afinfo);
219 EXPORT_SYMBOL(xfrm_unregister_type);
221 static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
223 struct xfrm_state_afinfo *afinfo;
224 const struct xfrm_type **typemap;
225 const struct xfrm_type *type;
226 int modload_attempted = 0;
229 afinfo = xfrm_state_get_afinfo(family);
230 if (unlikely(afinfo == NULL))
232 typemap = afinfo->type_map;
234 type = typemap[proto];
235 if (unlikely(type && !try_module_get(type->owner)))
237 if (!type && !modload_attempted) {
238 xfrm_state_put_afinfo(afinfo);
239 request_module("xfrm-type-%d-%d", family, proto);
240 modload_attempted = 1;
244 xfrm_state_put_afinfo(afinfo);
248 static void xfrm_put_type(const struct xfrm_type *type)
250 module_put(type->owner);
253 static DEFINE_SPINLOCK(xfrm_mode_lock);
254 int xfrm_register_mode(struct xfrm_mode *mode, int family)
256 struct xfrm_state_afinfo *afinfo;
257 struct xfrm_mode **modemap;
260 if (unlikely(mode->encap >= XFRM_MODE_MAX))
263 afinfo = xfrm_state_get_afinfo(family);
264 if (unlikely(afinfo == NULL))
265 return -EAFNOSUPPORT;
268 modemap = afinfo->mode_map;
269 spin_lock_bh(&xfrm_mode_lock);
270 if (modemap[mode->encap])
274 if (!try_module_get(afinfo->owner))
277 mode->afinfo = afinfo;
278 modemap[mode->encap] = mode;
282 spin_unlock_bh(&xfrm_mode_lock);
283 xfrm_state_put_afinfo(afinfo);
286 EXPORT_SYMBOL(xfrm_register_mode);
288 int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
290 struct xfrm_state_afinfo *afinfo;
291 struct xfrm_mode **modemap;
294 if (unlikely(mode->encap >= XFRM_MODE_MAX))
297 afinfo = xfrm_state_get_afinfo(family);
298 if (unlikely(afinfo == NULL))
299 return -EAFNOSUPPORT;
302 modemap = afinfo->mode_map;
303 spin_lock_bh(&xfrm_mode_lock);
304 if (likely(modemap[mode->encap] == mode)) {
305 modemap[mode->encap] = NULL;
306 module_put(mode->afinfo->owner);
310 spin_unlock_bh(&xfrm_mode_lock);
311 xfrm_state_put_afinfo(afinfo);
314 EXPORT_SYMBOL(xfrm_unregister_mode);
316 static struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
318 struct xfrm_state_afinfo *afinfo;
319 struct xfrm_mode *mode;
320 int modload_attempted = 0;
322 if (unlikely(encap >= XFRM_MODE_MAX))
326 afinfo = xfrm_state_get_afinfo(family);
327 if (unlikely(afinfo == NULL))
330 mode = afinfo->mode_map[encap];
331 if (unlikely(mode && !try_module_get(mode->owner)))
333 if (!mode && !modload_attempted) {
334 xfrm_state_put_afinfo(afinfo);
335 request_module("xfrm-mode-%d-%d", family, encap);
336 modload_attempted = 1;
340 xfrm_state_put_afinfo(afinfo);
344 static void xfrm_put_mode(struct xfrm_mode *mode)
346 module_put(mode->owner);
349 static void xfrm_state_gc_destroy(struct xfrm_state *x)
351 tasklet_hrtimer_cancel(&x->mtimer);
352 del_timer_sync(&x->rtimer);
359 kfree(x->replay_esn);
360 kfree(x->preplay_esn);
362 xfrm_put_mode(x->inner_mode);
363 if (x->inner_mode_iaf)
364 xfrm_put_mode(x->inner_mode_iaf);
366 xfrm_put_mode(x->outer_mode);
368 x->type->destructor(x);
369 xfrm_put_type(x->type);
371 security_xfrm_state_free(x);
375 static void xfrm_state_gc_task(struct work_struct *work)
377 struct xfrm_state *x;
378 struct hlist_node *tmp;
379 struct hlist_head gc_list;
381 spin_lock_bh(&xfrm_state_gc_lock);
382 hlist_move_list(&xfrm_state_gc_list, &gc_list);
383 spin_unlock_bh(&xfrm_state_gc_lock);
387 hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
388 xfrm_state_gc_destroy(x);
391 static inline unsigned long make_jiffies(long secs)
393 if (secs >= (MAX_SCHEDULE_TIMEOUT-1)/HZ)
394 return MAX_SCHEDULE_TIMEOUT-1;
399 static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
401 struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
402 struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
403 unsigned long now = get_seconds();
404 long next = LONG_MAX;
409 if (x->km.state == XFRM_STATE_DEAD)
411 if (x->km.state == XFRM_STATE_EXPIRED)
413 if (x->lft.hard_add_expires_seconds) {
414 long tmo = x->lft.hard_add_expires_seconds +
415 x->curlft.add_time - now;
417 if (x->xflags & XFRM_SOFT_EXPIRE) {
418 /* enter hard expire without soft expire first?!
419 * setting a new date could trigger this.
420 * workarbound: fix x->curflt.add_time by below:
422 x->curlft.add_time = now - x->saved_tmo - 1;
423 tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
430 if (x->lft.hard_use_expires_seconds) {
431 long tmo = x->lft.hard_use_expires_seconds +
432 (x->curlft.use_time ? : now) - now;
440 if (x->lft.soft_add_expires_seconds) {
441 long tmo = x->lft.soft_add_expires_seconds +
442 x->curlft.add_time - now;
445 x->xflags &= ~XFRM_SOFT_EXPIRE;
446 } else if (tmo < next) {
448 x->xflags |= XFRM_SOFT_EXPIRE;
452 if (x->lft.soft_use_expires_seconds) {
453 long tmo = x->lft.soft_use_expires_seconds +
454 (x->curlft.use_time ? : now) - now;
463 km_state_expired(x, 0, 0);
465 if (next != LONG_MAX) {
466 tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
472 if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
473 x->km.state = XFRM_STATE_EXPIRED;
475 err = __xfrm_state_delete(x);
477 km_state_expired(x, 1, 0);
479 xfrm_audit_state_delete(x, err ? 0 : 1, true);
482 spin_unlock(&x->lock);
483 return HRTIMER_NORESTART;
486 static void xfrm_replay_timer_handler(unsigned long data);
488 struct xfrm_state *xfrm_state_alloc(struct net *net)
490 struct xfrm_state *x;
492 x = kzalloc(sizeof(struct xfrm_state), GFP_ATOMIC);
495 write_pnet(&x->xs_net, net);
496 atomic_set(&x->refcnt, 1);
497 atomic_set(&x->tunnel_users, 0);
498 INIT_LIST_HEAD(&x->km.all);
499 INIT_HLIST_NODE(&x->bydst);
500 INIT_HLIST_NODE(&x->bysrc);
501 INIT_HLIST_NODE(&x->byspi);
502 tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler,
503 CLOCK_BOOTTIME, HRTIMER_MODE_ABS);
504 setup_timer(&x->rtimer, xfrm_replay_timer_handler,
506 x->curlft.add_time = get_seconds();
507 x->lft.soft_byte_limit = XFRM_INF;
508 x->lft.soft_packet_limit = XFRM_INF;
509 x->lft.hard_byte_limit = XFRM_INF;
510 x->lft.hard_packet_limit = XFRM_INF;
511 x->replay_maxage = 0;
512 x->replay_maxdiff = 0;
513 x->inner_mode = NULL;
514 x->inner_mode_iaf = NULL;
515 spin_lock_init(&x->lock);
519 EXPORT_SYMBOL(xfrm_state_alloc);
521 void __xfrm_state_destroy(struct xfrm_state *x)
523 WARN_ON(x->km.state != XFRM_STATE_DEAD);
525 spin_lock_bh(&xfrm_state_gc_lock);
526 hlist_add_head(&x->gclist, &xfrm_state_gc_list);
527 spin_unlock_bh(&xfrm_state_gc_lock);
528 schedule_work(&xfrm_state_gc_work);
530 EXPORT_SYMBOL(__xfrm_state_destroy);
532 int __xfrm_state_delete(struct xfrm_state *x)
534 struct net *net = xs_net(x);
537 if (x->km.state != XFRM_STATE_DEAD) {
538 x->km.state = XFRM_STATE_DEAD;
539 spin_lock(&net->xfrm.xfrm_state_lock);
540 list_del(&x->km.all);
541 hlist_del_rcu(&x->bydst);
542 hlist_del_rcu(&x->bysrc);
544 hlist_del_rcu(&x->byspi);
545 net->xfrm.state_num--;
546 spin_unlock(&net->xfrm.xfrm_state_lock);
548 /* All xfrm_state objects are created by xfrm_state_alloc.
549 * The xfrm_state_alloc call gives a reference, and that
550 * is what we are dropping here.
558 EXPORT_SYMBOL(__xfrm_state_delete);
560 int xfrm_state_delete(struct xfrm_state *x)
564 spin_lock_bh(&x->lock);
565 err = __xfrm_state_delete(x);
566 spin_unlock_bh(&x->lock);
570 EXPORT_SYMBOL(xfrm_state_delete);
572 #ifdef CONFIG_SECURITY_NETWORK_XFRM
574 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
578 for (i = 0; i <= net->xfrm.state_hmask; i++) {
579 struct xfrm_state *x;
581 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
582 if (xfrm_id_proto_match(x->id.proto, proto) &&
583 (err = security_xfrm_state_delete(x)) != 0) {
584 xfrm_audit_state_delete(x, 0, task_valid);
594 xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
600 int xfrm_state_flush(struct net *net, u8 proto, bool task_valid)
602 int i, err = 0, cnt = 0;
604 spin_lock_bh(&net->xfrm.xfrm_state_lock);
605 err = xfrm_state_flush_secctx_check(net, proto, task_valid);
610 for (i = 0; i <= net->xfrm.state_hmask; i++) {
611 struct xfrm_state *x;
613 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
614 if (!xfrm_state_kern(x) &&
615 xfrm_id_proto_match(x->id.proto, proto)) {
617 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
619 err = xfrm_state_delete(x);
620 xfrm_audit_state_delete(x, err ? 0 : 1,
626 spin_lock_bh(&net->xfrm.xfrm_state_lock);
635 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
638 EXPORT_SYMBOL(xfrm_state_flush);
640 void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
642 spin_lock_bh(&net->xfrm.xfrm_state_lock);
643 si->sadcnt = net->xfrm.state_num;
644 si->sadhcnt = net->xfrm.state_hmask + 1;
645 si->sadhmcnt = xfrm_state_hashmax;
646 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
648 EXPORT_SYMBOL(xfrm_sad_getinfo);
651 xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
652 const struct xfrm_tmpl *tmpl,
653 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
654 unsigned short family)
656 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
659 afinfo->init_tempsel(&x->sel, fl);
661 if (family != tmpl->encap_family) {
662 xfrm_state_put_afinfo(afinfo);
663 afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
667 afinfo->init_temprop(x, tmpl, daddr, saddr);
668 xfrm_state_put_afinfo(afinfo);
672 static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
673 const xfrm_address_t *daddr,
674 __be32 spi, u8 proto,
675 unsigned short family)
677 unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
678 struct xfrm_state *x;
680 hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
681 if (x->props.family != family ||
683 x->id.proto != proto ||
684 !xfrm_addr_equal(&x->id.daddr, daddr, family))
687 if ((mark & x->mark.m) != x->mark.v)
689 if (!xfrm_state_hold_rcu(x))
697 static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
698 const xfrm_address_t *daddr,
699 const xfrm_address_t *saddr,
700 u8 proto, unsigned short family)
702 unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
703 struct xfrm_state *x;
705 hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
706 if (x->props.family != family ||
707 x->id.proto != proto ||
708 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
709 !xfrm_addr_equal(&x->props.saddr, saddr, family))
712 if ((mark & x->mark.m) != x->mark.v)
714 if (!xfrm_state_hold_rcu(x))
722 static inline struct xfrm_state *
723 __xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
725 struct net *net = xs_net(x);
726 u32 mark = x->mark.v & x->mark.m;
729 return __xfrm_state_lookup(net, mark, &x->id.daddr,
730 x->id.spi, x->id.proto, family);
732 return __xfrm_state_lookup_byaddr(net, mark,
735 x->id.proto, family);
738 static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
740 if (have_hash_collision &&
741 (net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
742 net->xfrm.state_num > net->xfrm.state_hmask)
743 schedule_work(&net->xfrm.state_hash_work);
746 static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
747 const struct flowi *fl, unsigned short family,
748 struct xfrm_state **best, int *acq_in_progress,
752 * 1. There is a valid state with matching selector. Done.
753 * 2. Valid state with inappropriate selector. Skip.
755 * Entering area of "sysdeps".
757 * 3. If state is not valid, selector is temporary, it selects
758 * only session which triggered previous resolution. Key
759 * manager will do something to install a state with proper
762 if (x->km.state == XFRM_STATE_VALID) {
763 if ((x->sel.family &&
764 (x->sel.family != family ||
765 !xfrm_selector_match(&x->sel, fl, family))) ||
766 !security_xfrm_state_pol_flow_match(x, pol, fl))
770 (*best)->km.dying > x->km.dying ||
771 ((*best)->km.dying == x->km.dying &&
772 (*best)->curlft.add_time < x->curlft.add_time))
774 } else if (x->km.state == XFRM_STATE_ACQ) {
775 *acq_in_progress = 1;
776 } else if (x->km.state == XFRM_STATE_ERROR ||
777 x->km.state == XFRM_STATE_EXPIRED) {
778 if ((!x->sel.family ||
779 (x->sel.family == family &&
780 xfrm_selector_match(&x->sel, fl, family))) &&
781 security_xfrm_state_pol_flow_match(x, pol, fl))
787 xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
788 const struct flowi *fl, struct xfrm_tmpl *tmpl,
789 struct xfrm_policy *pol, int *err,
790 unsigned short family)
792 static xfrm_address_t saddr_wildcard = { };
793 struct net *net = xp_net(pol);
794 unsigned int h, h_wildcard;
795 struct xfrm_state *x, *x0, *to_put;
796 int acquire_in_progress = 0;
798 struct xfrm_state *best = NULL;
799 u32 mark = pol->mark.v & pol->mark.m;
800 unsigned short encap_family = tmpl->encap_family;
801 unsigned int sequence;
806 sequence = read_seqcount_begin(&xfrm_state_hash_generation);
809 h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
810 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
811 if (x->props.family == encap_family &&
812 x->props.reqid == tmpl->reqid &&
813 (mark & x->mark.m) == x->mark.v &&
814 !(x->props.flags & XFRM_STATE_WILDRECV) &&
815 xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
816 tmpl->mode == x->props.mode &&
817 tmpl->id.proto == x->id.proto &&
818 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
819 xfrm_state_look_at(pol, x, fl, family,
820 &best, &acquire_in_progress, &error);
822 if (best || acquire_in_progress)
825 h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
826 hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
827 if (x->props.family == encap_family &&
828 x->props.reqid == tmpl->reqid &&
829 (mark & x->mark.m) == x->mark.v &&
830 !(x->props.flags & XFRM_STATE_WILDRECV) &&
831 xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
832 tmpl->mode == x->props.mode &&
833 tmpl->id.proto == x->id.proto &&
834 (tmpl->id.spi == x->id.spi || !tmpl->id.spi))
835 xfrm_state_look_at(pol, x, fl, family,
836 &best, &acquire_in_progress, &error);
841 if (!x && !error && !acquire_in_progress) {
843 (x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
844 tmpl->id.proto, encap_family)) != NULL) {
851 /* If the KMs have no listeners (yet...), avoid allocating an SA
852 * for each and every packet - garbage collection might not
855 if (!km_is_alive(&c)) {
860 x = xfrm_state_alloc(net);
865 /* Initialize temporary state matching only
866 * to current session. */
867 xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
868 memcpy(&x->mark, &pol->mark, sizeof(x->mark));
870 error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
872 x->km.state = XFRM_STATE_DEAD;
878 if (km_query(x, tmpl, pol) == 0) {
879 spin_lock_bh(&net->xfrm.xfrm_state_lock);
880 x->km.state = XFRM_STATE_ACQ;
881 list_add(&x->km.all, &net->xfrm.state_all);
882 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
883 h = xfrm_src_hash(net, daddr, saddr, encap_family);
884 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
886 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
887 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
889 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
890 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
891 net->xfrm.state_num++;
892 xfrm_hash_grow_check(net, x->bydst.next != NULL);
893 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
895 x->km.state = XFRM_STATE_DEAD;
903 if (!xfrm_state_hold_rcu(x)) {
908 *err = acquire_in_progress ? -EAGAIN : error;
912 xfrm_state_put(to_put);
914 if (read_seqcount_retry(&xfrm_state_hash_generation, sequence)) {
926 xfrm_stateonly_find(struct net *net, u32 mark,
927 xfrm_address_t *daddr, xfrm_address_t *saddr,
928 unsigned short family, u8 mode, u8 proto, u32 reqid)
931 struct xfrm_state *rx = NULL, *x = NULL;
933 spin_lock_bh(&net->xfrm.xfrm_state_lock);
934 h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
935 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
936 if (x->props.family == family &&
937 x->props.reqid == reqid &&
938 (mark & x->mark.m) == x->mark.v &&
939 !(x->props.flags & XFRM_STATE_WILDRECV) &&
940 xfrm_state_addr_check(x, daddr, saddr, family) &&
941 mode == x->props.mode &&
942 proto == x->id.proto &&
943 x->km.state == XFRM_STATE_VALID) {
951 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
956 EXPORT_SYMBOL(xfrm_stateonly_find);
958 struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
959 unsigned short family)
961 struct xfrm_state *x;
962 struct xfrm_state_walk *w;
964 spin_lock_bh(&net->xfrm.xfrm_state_lock);
965 list_for_each_entry(w, &net->xfrm.state_all, all) {
966 x = container_of(w, struct xfrm_state, km);
967 if (x->props.family != family ||
972 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
975 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
978 EXPORT_SYMBOL(xfrm_state_lookup_byspi);
980 static void __xfrm_state_insert(struct xfrm_state *x)
982 struct net *net = xs_net(x);
985 list_add(&x->km.all, &net->xfrm.state_all);
987 h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
988 x->props.reqid, x->props.family);
989 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
991 h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
992 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
995 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
998 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1001 tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1002 if (x->replay_maxage)
1003 mod_timer(&x->rtimer, jiffies + x->replay_maxage);
1005 net->xfrm.state_num++;
1007 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1010 /* net->xfrm.xfrm_state_lock is held */
1011 static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
1013 struct net *net = xs_net(xnew);
1014 unsigned short family = xnew->props.family;
1015 u32 reqid = xnew->props.reqid;
1016 struct xfrm_state *x;
1018 u32 mark = xnew->mark.v & xnew->mark.m;
1020 h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
1021 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1022 if (x->props.family == family &&
1023 x->props.reqid == reqid &&
1024 (mark & x->mark.m) == x->mark.v &&
1025 xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
1026 xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
1031 void xfrm_state_insert(struct xfrm_state *x)
1033 struct net *net = xs_net(x);
1035 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1036 __xfrm_state_bump_genids(x);
1037 __xfrm_state_insert(x);
1038 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1040 EXPORT_SYMBOL(xfrm_state_insert);
1042 /* net->xfrm.xfrm_state_lock is held */
1043 static struct xfrm_state *__find_acq_core(struct net *net,
1044 const struct xfrm_mark *m,
1045 unsigned short family, u8 mode,
1046 u32 reqid, u8 proto,
1047 const xfrm_address_t *daddr,
1048 const xfrm_address_t *saddr,
1051 unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
1052 struct xfrm_state *x;
1053 u32 mark = m->v & m->m;
1055 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1056 if (x->props.reqid != reqid ||
1057 x->props.mode != mode ||
1058 x->props.family != family ||
1059 x->km.state != XFRM_STATE_ACQ ||
1061 x->id.proto != proto ||
1062 (mark & x->mark.m) != x->mark.v ||
1063 !xfrm_addr_equal(&x->id.daddr, daddr, family) ||
1064 !xfrm_addr_equal(&x->props.saddr, saddr, family))
1074 x = xfrm_state_alloc(net);
1078 x->sel.daddr.a4 = daddr->a4;
1079 x->sel.saddr.a4 = saddr->a4;
1080 x->sel.prefixlen_d = 32;
1081 x->sel.prefixlen_s = 32;
1082 x->props.saddr.a4 = saddr->a4;
1083 x->id.daddr.a4 = daddr->a4;
1087 x->sel.daddr.in6 = daddr->in6;
1088 x->sel.saddr.in6 = saddr->in6;
1089 x->sel.prefixlen_d = 128;
1090 x->sel.prefixlen_s = 128;
1091 x->props.saddr.in6 = saddr->in6;
1092 x->id.daddr.in6 = daddr->in6;
1096 x->km.state = XFRM_STATE_ACQ;
1097 x->id.proto = proto;
1098 x->props.family = family;
1099 x->props.mode = mode;
1100 x->props.reqid = reqid;
1103 x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
1105 tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
1106 list_add(&x->km.all, &net->xfrm.state_all);
1107 hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
1108 h = xfrm_src_hash(net, daddr, saddr, family);
1109 hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
1111 net->xfrm.state_num++;
1113 xfrm_hash_grow_check(net, x->bydst.next != NULL);
1119 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
1121 int xfrm_state_add(struct xfrm_state *x)
1123 struct net *net = xs_net(x);
1124 struct xfrm_state *x1, *to_put;
1127 u32 mark = x->mark.v & x->mark.m;
1128 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1130 family = x->props.family;
1134 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1136 x1 = __xfrm_state_locate(x, use_spi, family);
1144 if (use_spi && x->km.seq) {
1145 x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
1146 if (x1 && ((x1->id.proto != x->id.proto) ||
1147 !xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
1154 x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
1155 x->props.reqid, x->id.proto,
1156 &x->id.daddr, &x->props.saddr, 0);
1158 __xfrm_state_bump_genids(x);
1159 __xfrm_state_insert(x);
1163 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1166 xfrm_state_delete(x1);
1171 xfrm_state_put(to_put);
1175 EXPORT_SYMBOL(xfrm_state_add);
1177 #ifdef CONFIG_XFRM_MIGRATE
1178 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig)
1180 struct net *net = xs_net(orig);
1181 struct xfrm_state *x = xfrm_state_alloc(net);
1185 memcpy(&x->id, &orig->id, sizeof(x->id));
1186 memcpy(&x->sel, &orig->sel, sizeof(x->sel));
1187 memcpy(&x->lft, &orig->lft, sizeof(x->lft));
1188 x->props.mode = orig->props.mode;
1189 x->props.replay_window = orig->props.replay_window;
1190 x->props.reqid = orig->props.reqid;
1191 x->props.family = orig->props.family;
1192 x->props.saddr = orig->props.saddr;
1195 x->aalg = xfrm_algo_auth_clone(orig->aalg);
1199 x->props.aalgo = orig->props.aalgo;
1202 x->aead = xfrm_algo_aead_clone(orig->aead);
1203 x->geniv = orig->geniv;
1208 x->ealg = xfrm_algo_clone(orig->ealg);
1212 x->props.ealgo = orig->props.ealgo;
1215 x->calg = xfrm_algo_clone(orig->calg);
1219 x->props.calgo = orig->props.calgo;
1222 x->encap = kmemdup(orig->encap, sizeof(*x->encap), GFP_KERNEL);
1228 x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
1234 if (orig->replay_esn) {
1235 if (xfrm_replay_clone(x, orig))
1239 memcpy(&x->mark, &orig->mark, sizeof(x->mark));
1241 if (xfrm_init_state(x) < 0)
1244 x->props.flags = orig->props.flags;
1245 x->props.extra_flags = orig->props.extra_flags;
1247 x->tfcpad = orig->tfcpad;
1248 x->replay_maxdiff = orig->replay_maxdiff;
1249 x->replay_maxage = orig->replay_maxage;
1250 memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
1251 x->km.state = orig->km.state;
1252 x->km.seq = orig->km.seq;
1253 x->replay = orig->replay;
1254 x->preplay = orig->preplay;
1264 struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
1267 struct xfrm_state *x = NULL;
1269 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1272 h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
1273 m->reqid, m->old_family);
1274 hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
1275 if (x->props.mode != m->mode ||
1276 x->id.proto != m->proto)
1278 if (m->reqid && x->props.reqid != m->reqid)
1280 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1282 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1289 h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
1291 hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
1292 if (x->props.mode != m->mode ||
1293 x->id.proto != m->proto)
1295 if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
1297 !xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
1305 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1309 EXPORT_SYMBOL(xfrm_migrate_state_find);
1311 struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
1312 struct xfrm_migrate *m)
1314 struct xfrm_state *xc;
1316 xc = xfrm_state_clone(x);
1320 memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
1321 memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
1324 if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
1325 /* a care is needed when the destination address of the
1326 state is to be updated as it is a part of triplet */
1327 xfrm_state_insert(xc);
1329 if (xfrm_state_add(xc) < 0)
1338 EXPORT_SYMBOL(xfrm_state_migrate);
1341 int xfrm_state_update(struct xfrm_state *x)
1343 struct xfrm_state *x1, *to_put;
1345 int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
1346 struct net *net = xs_net(x);
1350 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1351 x1 = __xfrm_state_locate(x, use_spi, x->props.family);
1357 if (xfrm_state_kern(x1)) {
1363 if (x1->km.state == XFRM_STATE_ACQ) {
1364 __xfrm_state_insert(x);
1370 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1373 xfrm_state_put(to_put);
1379 xfrm_state_delete(x1);
1385 spin_lock_bh(&x1->lock);
1386 if (likely(x1->km.state == XFRM_STATE_VALID)) {
1387 if (x->encap && x1->encap)
1388 memcpy(x1->encap, x->encap, sizeof(*x1->encap));
1389 if (x->coaddr && x1->coaddr) {
1390 memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
1392 if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
1393 memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
1394 memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
1397 tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
1398 if (x1->curlft.use_time)
1399 xfrm_state_check_expire(x1);
1402 x->km.state = XFRM_STATE_DEAD;
1403 __xfrm_state_put(x);
1405 spin_unlock_bh(&x1->lock);
1411 EXPORT_SYMBOL(xfrm_state_update);
1413 int xfrm_state_check_expire(struct xfrm_state *x)
1415 if (!x->curlft.use_time)
1416 x->curlft.use_time = get_seconds();
1418 if (x->curlft.bytes >= x->lft.hard_byte_limit ||
1419 x->curlft.packets >= x->lft.hard_packet_limit) {
1420 x->km.state = XFRM_STATE_EXPIRED;
1421 tasklet_hrtimer_start(&x->mtimer, ktime_set(0, 0), HRTIMER_MODE_REL);
1426 (x->curlft.bytes >= x->lft.soft_byte_limit ||
1427 x->curlft.packets >= x->lft.soft_packet_limit)) {
1429 km_state_expired(x, 0, 0);
1433 EXPORT_SYMBOL(xfrm_state_check_expire);
1436 xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
1437 u8 proto, unsigned short family)
1439 struct xfrm_state *x;
1442 x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
1446 EXPORT_SYMBOL(xfrm_state_lookup);
1449 xfrm_state_lookup_byaddr(struct net *net, u32 mark,
1450 const xfrm_address_t *daddr, const xfrm_address_t *saddr,
1451 u8 proto, unsigned short family)
1453 struct xfrm_state *x;
1455 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1456 x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
1457 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1460 EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
1463 xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
1464 u8 proto, const xfrm_address_t *daddr,
1465 const xfrm_address_t *saddr, int create, unsigned short family)
1467 struct xfrm_state *x;
1469 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1470 x = __find_acq_core(net, mark, family, mode, reqid, proto, daddr, saddr, create);
1471 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1475 EXPORT_SYMBOL(xfrm_find_acq);
1477 #ifdef CONFIG_XFRM_SUB_POLICY
1479 xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
1480 unsigned short family, struct net *net)
1483 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1485 return -EAFNOSUPPORT;
1487 spin_lock_bh(&net->xfrm.xfrm_state_lock); /*FIXME*/
1488 if (afinfo->tmpl_sort)
1489 err = afinfo->tmpl_sort(dst, src, n);
1490 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1491 xfrm_state_put_afinfo(afinfo);
1494 EXPORT_SYMBOL(xfrm_tmpl_sort);
1497 xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
1498 unsigned short family)
1501 struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
1502 struct net *net = xs_net(*src);
1505 return -EAFNOSUPPORT;
1507 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1508 if (afinfo->state_sort)
1509 err = afinfo->state_sort(dst, src, n);
1510 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1511 xfrm_state_put_afinfo(afinfo);
1514 EXPORT_SYMBOL(xfrm_state_sort);
1517 /* Silly enough, but I'm lazy to build resolution list */
1519 static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1523 for (i = 0; i <= net->xfrm.state_hmask; i++) {
1524 struct xfrm_state *x;
1526 hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
1527 if (x->km.seq == seq &&
1528 (mark & x->mark.m) == x->mark.v &&
1529 x->km.state == XFRM_STATE_ACQ) {
1538 struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
1540 struct xfrm_state *x;
1542 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1543 x = __xfrm_find_acq_byseq(net, mark, seq);
1544 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1547 EXPORT_SYMBOL(xfrm_find_acq_byseq);
1549 u32 xfrm_get_acqseq(void)
1552 static atomic_t acqseq;
1555 res = atomic_inc_return(&acqseq);
1560 EXPORT_SYMBOL(xfrm_get_acqseq);
1562 int verify_spi_info(u8 proto, u32 min, u32 max)
1570 /* IPCOMP spi is 16-bits. */
1584 EXPORT_SYMBOL(verify_spi_info);
1586 int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
1588 struct net *net = xs_net(x);
1590 struct xfrm_state *x0;
1592 __be32 minspi = htonl(low);
1593 __be32 maxspi = htonl(high);
1595 u32 mark = x->mark.v & x->mark.m;
1597 spin_lock_bh(&x->lock);
1598 if (x->km.state == XFRM_STATE_DEAD)
1607 if (minspi == maxspi) {
1608 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
1616 for (h = 0; h < high-low+1; h++) {
1617 spi = low + prandom_u32()%(high-low+1);
1618 x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
1620 newspi = htonl(spi);
1627 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1629 h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
1630 hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
1631 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1637 spin_unlock_bh(&x->lock);
1641 EXPORT_SYMBOL(xfrm_alloc_spi);
1643 static bool __xfrm_state_filter_match(struct xfrm_state *x,
1644 struct xfrm_address_filter *filter)
1647 if ((filter->family == AF_INET ||
1648 filter->family == AF_INET6) &&
1649 x->props.family != filter->family)
1652 return addr_match(&x->props.saddr, &filter->saddr,
1654 addr_match(&x->id.daddr, &filter->daddr,
1660 int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
1661 int (*func)(struct xfrm_state *, int, void*),
1664 struct xfrm_state *state;
1665 struct xfrm_state_walk *x;
1668 if (walk->seq != 0 && list_empty(&walk->all))
1671 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1672 if (list_empty(&walk->all))
1673 x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
1675 x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
1676 list_for_each_entry_from(x, &net->xfrm.state_all, all) {
1677 if (x->state == XFRM_STATE_DEAD)
1679 state = container_of(x, struct xfrm_state, km);
1680 if (!xfrm_id_proto_match(state->id.proto, walk->proto))
1682 if (!__xfrm_state_filter_match(state, walk->filter))
1684 err = func(state, walk->seq, data);
1686 list_move_tail(&walk->all, &x->all);
1691 if (walk->seq == 0) {
1695 list_del_init(&walk->all);
1697 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1700 EXPORT_SYMBOL(xfrm_state_walk);
1702 void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
1703 struct xfrm_address_filter *filter)
1705 INIT_LIST_HEAD(&walk->all);
1706 walk->proto = proto;
1707 walk->state = XFRM_STATE_DEAD;
1709 walk->filter = filter;
1711 EXPORT_SYMBOL(xfrm_state_walk_init);
1713 void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
1715 kfree(walk->filter);
1717 if (list_empty(&walk->all))
1720 spin_lock_bh(&net->xfrm.xfrm_state_lock);
1721 list_del(&walk->all);
1722 spin_unlock_bh(&net->xfrm.xfrm_state_lock);
1724 EXPORT_SYMBOL(xfrm_state_walk_done);
1726 static void xfrm_replay_timer_handler(unsigned long data)
1728 struct xfrm_state *x = (struct xfrm_state *)data;
1730 spin_lock(&x->lock);
1732 if (x->km.state == XFRM_STATE_VALID) {
1733 if (xfrm_aevent_is_on(xs_net(x)))
1734 x->repl->notify(x, XFRM_REPLAY_TIMEOUT);
1736 x->xflags |= XFRM_TIME_DEFER;
1739 spin_unlock(&x->lock);
1742 static LIST_HEAD(xfrm_km_list);
1744 void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
1746 struct xfrm_mgr *km;
1749 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1750 if (km->notify_policy)
1751 km->notify_policy(xp, dir, c);
1755 void km_state_notify(struct xfrm_state *x, const struct km_event *c)
1757 struct xfrm_mgr *km;
1759 list_for_each_entry_rcu(km, &xfrm_km_list, list)
1765 EXPORT_SYMBOL(km_policy_notify);
1766 EXPORT_SYMBOL(km_state_notify);
1768 void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
1774 c.event = XFRM_MSG_EXPIRE;
1775 km_state_notify(x, &c);
1778 EXPORT_SYMBOL(km_state_expired);
1780 * We send to all registered managers regardless of failure
1781 * We are happy with one success
1783 int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
1785 int err = -EINVAL, acqret;
1786 struct xfrm_mgr *km;
1789 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1790 acqret = km->acquire(x, t, pol);
1797 EXPORT_SYMBOL(km_query);
1799 int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
1802 struct xfrm_mgr *km;
1805 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1806 if (km->new_mapping)
1807 err = km->new_mapping(x, ipaddr, sport);
1814 EXPORT_SYMBOL(km_new_mapping);
1816 void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
1822 c.event = XFRM_MSG_POLEXPIRE;
1823 km_policy_notify(pol, dir, &c);
1825 EXPORT_SYMBOL(km_policy_expired);
1827 #ifdef CONFIG_XFRM_MIGRATE
1828 int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
1829 const struct xfrm_migrate *m, int num_migrate,
1830 const struct xfrm_kmaddress *k)
1834 struct xfrm_mgr *km;
1837 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1839 ret = km->migrate(sel, dir, type, m, num_migrate, k);
1847 EXPORT_SYMBOL(km_migrate);
1850 int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
1854 struct xfrm_mgr *km;
1857 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1859 ret = km->report(net, proto, sel, addr);
1867 EXPORT_SYMBOL(km_report);
1869 bool km_is_alive(const struct km_event *c)
1871 struct xfrm_mgr *km;
1872 bool is_alive = false;
1875 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1876 if (km->is_alive && km->is_alive(c)) {
1885 EXPORT_SYMBOL(km_is_alive);
1887 int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1891 struct xfrm_mgr *km;
1892 struct xfrm_policy *pol = NULL;
1894 #ifdef CONFIG_COMPAT
1895 if (in_compat_syscall())
1899 if (!optval && !optlen) {
1900 xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
1901 xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
1906 if (optlen <= 0 || optlen > PAGE_SIZE)
1909 data = kmalloc(optlen, GFP_KERNEL);
1914 if (copy_from_user(data, optval, optlen))
1919 list_for_each_entry_rcu(km, &xfrm_km_list, list) {
1920 pol = km->compile_policy(sk, optname, data,
1928 xfrm_sk_policy_insert(sk, err, pol);
1937 EXPORT_SYMBOL(xfrm_user_policy);
1939 static DEFINE_SPINLOCK(xfrm_km_lock);
1941 int xfrm_register_km(struct xfrm_mgr *km)
1943 spin_lock_bh(&xfrm_km_lock);
1944 list_add_tail_rcu(&km->list, &xfrm_km_list);
1945 spin_unlock_bh(&xfrm_km_lock);
1948 EXPORT_SYMBOL(xfrm_register_km);
1950 int xfrm_unregister_km(struct xfrm_mgr *km)
1952 spin_lock_bh(&xfrm_km_lock);
1953 list_del_rcu(&km->list);
1954 spin_unlock_bh(&xfrm_km_lock);
1958 EXPORT_SYMBOL(xfrm_unregister_km);
1960 int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
1963 if (unlikely(afinfo == NULL))
1965 if (unlikely(afinfo->family >= NPROTO))
1966 return -EAFNOSUPPORT;
1967 spin_lock_bh(&xfrm_state_afinfo_lock);
1968 if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
1971 rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
1972 spin_unlock_bh(&xfrm_state_afinfo_lock);
1975 EXPORT_SYMBOL(xfrm_state_register_afinfo);
1977 int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
1980 if (unlikely(afinfo == NULL))
1982 if (unlikely(afinfo->family >= NPROTO))
1983 return -EAFNOSUPPORT;
1984 spin_lock_bh(&xfrm_state_afinfo_lock);
1985 if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
1986 if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
1989 RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
1991 spin_unlock_bh(&xfrm_state_afinfo_lock);
1995 EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
1997 struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
1999 struct xfrm_state_afinfo *afinfo;
2000 if (unlikely(family >= NPROTO))
2003 afinfo = rcu_dereference(xfrm_state_afinfo[family]);
2004 if (unlikely(!afinfo))
2009 void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
2014 /* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
2015 void xfrm_state_delete_tunnel(struct xfrm_state *x)
2018 struct xfrm_state *t = x->tunnel;
2020 if (atomic_read(&t->tunnel_users) == 2)
2021 xfrm_state_delete(t);
2022 atomic_dec(&t->tunnel_users);
2027 EXPORT_SYMBOL(xfrm_state_delete_tunnel);
2029 int xfrm_state_mtu(struct xfrm_state *x, int mtu)
2033 spin_lock_bh(&x->lock);
2034 if (x->km.state == XFRM_STATE_VALID &&
2035 x->type && x->type->get_mtu)
2036 res = x->type->get_mtu(x, mtu);
2038 res = mtu - x->props.header_len;
2039 spin_unlock_bh(&x->lock);
2043 int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
2045 struct xfrm_state_afinfo *afinfo;
2046 struct xfrm_mode *inner_mode;
2047 int family = x->props.family;
2050 err = -EAFNOSUPPORT;
2051 afinfo = xfrm_state_get_afinfo(family);
2056 if (afinfo->init_flags)
2057 err = afinfo->init_flags(x);
2059 xfrm_state_put_afinfo(afinfo);
2064 err = -EPROTONOSUPPORT;
2066 if (x->sel.family != AF_UNSPEC) {
2067 inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
2068 if (inner_mode == NULL)
2071 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
2072 family != x->sel.family) {
2073 xfrm_put_mode(inner_mode);
2077 x->inner_mode = inner_mode;
2079 struct xfrm_mode *inner_mode_iaf;
2080 int iafamily = AF_INET;
2082 inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
2083 if (inner_mode == NULL)
2086 if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL)) {
2087 xfrm_put_mode(inner_mode);
2090 x->inner_mode = inner_mode;
2092 if (x->props.family == AF_INET)
2093 iafamily = AF_INET6;
2095 inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
2096 if (inner_mode_iaf) {
2097 if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
2098 x->inner_mode_iaf = inner_mode_iaf;
2100 xfrm_put_mode(inner_mode_iaf);
2104 x->type = xfrm_get_type(x->id.proto, family);
2105 if (x->type == NULL)
2108 err = x->type->init_state(x);
2112 x->outer_mode = xfrm_get_mode(x->props.mode, family);
2113 if (x->outer_mode == NULL) {
2114 err = -EPROTONOSUPPORT;
2119 err = xfrm_init_replay(x);
2124 x->km.state = XFRM_STATE_VALID;
2130 EXPORT_SYMBOL(__xfrm_init_state);
2132 int xfrm_init_state(struct xfrm_state *x)
2134 return __xfrm_init_state(x, true);
2137 EXPORT_SYMBOL(xfrm_init_state);
2139 int __net_init xfrm_state_init(struct net *net)
2143 INIT_LIST_HEAD(&net->xfrm.state_all);
2145 sz = sizeof(struct hlist_head) * 8;
2147 net->xfrm.state_bydst = xfrm_hash_alloc(sz);
2148 if (!net->xfrm.state_bydst)
2150 net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
2151 if (!net->xfrm.state_bysrc)
2153 net->xfrm.state_byspi = xfrm_hash_alloc(sz);
2154 if (!net->xfrm.state_byspi)
2156 net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
2158 net->xfrm.state_num = 0;
2159 INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
2160 spin_lock_init(&net->xfrm.xfrm_state_lock);
2164 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2166 xfrm_hash_free(net->xfrm.state_bydst, sz);
2171 void xfrm_state_fini(struct net *net)
2175 flush_work(&net->xfrm.state_hash_work);
2176 xfrm_state_flush(net, 0, false);
2177 flush_work(&xfrm_state_gc_work);
2179 WARN_ON(!list_empty(&net->xfrm.state_all));
2181 sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
2182 WARN_ON(!hlist_empty(net->xfrm.state_byspi));
2183 xfrm_hash_free(net->xfrm.state_byspi, sz);
2184 WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
2185 xfrm_hash_free(net->xfrm.state_bysrc, sz);
2186 WARN_ON(!hlist_empty(net->xfrm.state_bydst));
2187 xfrm_hash_free(net->xfrm.state_bydst, sz);
2190 #ifdef CONFIG_AUDITSYSCALL
2191 static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
2192 struct audit_buffer *audit_buf)
2194 struct xfrm_sec_ctx *ctx = x->security;
2195 u32 spi = ntohl(x->id.spi);
2198 audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
2199 ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
2201 switch (x->props.family) {
2203 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2204 &x->props.saddr.a4, &x->id.daddr.a4);
2207 audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
2208 x->props.saddr.a6, x->id.daddr.a6);
2212 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2215 static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
2216 struct audit_buffer *audit_buf)
2218 const struct iphdr *iph4;
2219 const struct ipv6hdr *iph6;
2224 audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
2225 &iph4->saddr, &iph4->daddr);
2228 iph6 = ipv6_hdr(skb);
2229 audit_log_format(audit_buf,
2230 " src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
2231 &iph6->saddr, &iph6->daddr,
2232 iph6->flow_lbl[0] & 0x0f,
2239 void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
2241 struct audit_buffer *audit_buf;
2243 audit_buf = xfrm_audit_start("SAD-add");
2244 if (audit_buf == NULL)
2246 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2247 xfrm_audit_helper_sainfo(x, audit_buf);
2248 audit_log_format(audit_buf, " res=%u", result);
2249 audit_log_end(audit_buf);
2251 EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
2253 void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
2255 struct audit_buffer *audit_buf;
2257 audit_buf = xfrm_audit_start("SAD-delete");
2258 if (audit_buf == NULL)
2260 xfrm_audit_helper_usrinfo(task_valid, audit_buf);
2261 xfrm_audit_helper_sainfo(x, audit_buf);
2262 audit_log_format(audit_buf, " res=%u", result);
2263 audit_log_end(audit_buf);
2265 EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
2267 void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
2268 struct sk_buff *skb)
2270 struct audit_buffer *audit_buf;
2273 audit_buf = xfrm_audit_start("SA-replay-overflow");
2274 if (audit_buf == NULL)
2276 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2277 /* don't record the sequence number because it's inherent in this kind
2278 * of audit message */
2279 spi = ntohl(x->id.spi);
2280 audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
2281 audit_log_end(audit_buf);
2283 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
2285 void xfrm_audit_state_replay(struct xfrm_state *x,
2286 struct sk_buff *skb, __be32 net_seq)
2288 struct audit_buffer *audit_buf;
2291 audit_buf = xfrm_audit_start("SA-replayed-pkt");
2292 if (audit_buf == NULL)
2294 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2295 spi = ntohl(x->id.spi);
2296 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2297 spi, spi, ntohl(net_seq));
2298 audit_log_end(audit_buf);
2300 EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
2302 void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
2304 struct audit_buffer *audit_buf;
2306 audit_buf = xfrm_audit_start("SA-notfound");
2307 if (audit_buf == NULL)
2309 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2310 audit_log_end(audit_buf);
2312 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
2314 void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
2315 __be32 net_spi, __be32 net_seq)
2317 struct audit_buffer *audit_buf;
2320 audit_buf = xfrm_audit_start("SA-notfound");
2321 if (audit_buf == NULL)
2323 xfrm_audit_helper_pktinfo(skb, family, audit_buf);
2324 spi = ntohl(net_spi);
2325 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2326 spi, spi, ntohl(net_seq));
2327 audit_log_end(audit_buf);
2329 EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
2331 void xfrm_audit_state_icvfail(struct xfrm_state *x,
2332 struct sk_buff *skb, u8 proto)
2334 struct audit_buffer *audit_buf;
2338 audit_buf = xfrm_audit_start("SA-icv-failure");
2339 if (audit_buf == NULL)
2341 xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
2342 if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
2343 u32 spi = ntohl(net_spi);
2344 audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
2345 spi, spi, ntohl(net_seq));
2347 audit_log_end(audit_buf);
2349 EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
2350 #endif /* CONFIG_AUDITSYSCALL */