6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * Kazunori MIYAZAWA @USAGI
11 * Split up af-specific portion
12 * Derek Atkins <derek@ihtfp.com> Add the post_input processor
17 #include <linux/config.h>
18 #include <linux/slab.h>
19 #include <linux/kmod.h>
20 #include <linux/list.h>
21 #include <linux/spinlock.h>
22 #include <linux/workqueue.h>
23 #include <linux/notifier.h>
24 #include <linux/netdevice.h>
25 #include <linux/netfilter.h>
26 #include <linux/module.h>
30 DECLARE_MUTEX(xfrm_cfg_sem
);
31 EXPORT_SYMBOL(xfrm_cfg_sem
);
33 static DEFINE_RWLOCK(xfrm_policy_lock
);
35 struct xfrm_policy
*xfrm_policy_list
[XFRM_POLICY_MAX
*2];
36 EXPORT_SYMBOL(xfrm_policy_list
);
38 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock
);
39 static struct xfrm_policy_afinfo
*xfrm_policy_afinfo
[NPROTO
];
41 static kmem_cache_t
*xfrm_dst_cache __read_mostly
;
43 static struct work_struct xfrm_policy_gc_work
;
44 static struct list_head xfrm_policy_gc_list
=
45 LIST_HEAD_INIT(xfrm_policy_gc_list
);
46 static DEFINE_SPINLOCK(xfrm_policy_gc_lock
);
48 static struct xfrm_policy_afinfo
*xfrm_policy_get_afinfo(unsigned short family
);
49 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo
*afinfo
);
51 int xfrm_register_type(struct xfrm_type
*type
, unsigned short family
)
53 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
54 struct xfrm_type_map
*typemap
;
57 if (unlikely(afinfo
== NULL
))
59 typemap
= afinfo
->type_map
;
61 write_lock(&typemap
->lock
);
62 if (likely(typemap
->map
[type
->proto
] == NULL
))
63 typemap
->map
[type
->proto
] = type
;
66 write_unlock(&typemap
->lock
);
67 xfrm_policy_put_afinfo(afinfo
);
70 EXPORT_SYMBOL(xfrm_register_type
);
72 int xfrm_unregister_type(struct xfrm_type
*type
, unsigned short family
)
74 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
75 struct xfrm_type_map
*typemap
;
78 if (unlikely(afinfo
== NULL
))
80 typemap
= afinfo
->type_map
;
82 write_lock(&typemap
->lock
);
83 if (unlikely(typemap
->map
[type
->proto
] != type
))
86 typemap
->map
[type
->proto
] = NULL
;
87 write_unlock(&typemap
->lock
);
88 xfrm_policy_put_afinfo(afinfo
);
91 EXPORT_SYMBOL(xfrm_unregister_type
);
93 struct xfrm_type
*xfrm_get_type(u8 proto
, unsigned short family
)
95 struct xfrm_policy_afinfo
*afinfo
;
96 struct xfrm_type_map
*typemap
;
97 struct xfrm_type
*type
;
98 int modload_attempted
= 0;
101 afinfo
= xfrm_policy_get_afinfo(family
);
102 if (unlikely(afinfo
== NULL
))
104 typemap
= afinfo
->type_map
;
106 read_lock(&typemap
->lock
);
107 type
= typemap
->map
[proto
];
108 if (unlikely(type
&& !try_module_get(type
->owner
)))
110 read_unlock(&typemap
->lock
);
111 if (!type
&& !modload_attempted
) {
112 xfrm_policy_put_afinfo(afinfo
);
113 request_module("xfrm-type-%d-%d",
114 (int) family
, (int) proto
);
115 modload_attempted
= 1;
119 xfrm_policy_put_afinfo(afinfo
);
123 int xfrm_dst_lookup(struct xfrm_dst
**dst
, struct flowi
*fl
,
124 unsigned short family
)
126 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
129 if (unlikely(afinfo
== NULL
))
130 return -EAFNOSUPPORT
;
132 if (likely(afinfo
->dst_lookup
!= NULL
))
133 err
= afinfo
->dst_lookup(dst
, fl
);
136 xfrm_policy_put_afinfo(afinfo
);
139 EXPORT_SYMBOL(xfrm_dst_lookup
);
141 void xfrm_put_type(struct xfrm_type
*type
)
143 module_put(type
->owner
);
146 static inline unsigned long make_jiffies(long secs
)
148 if (secs
>= (MAX_SCHEDULE_TIMEOUT
-1)/HZ
)
149 return MAX_SCHEDULE_TIMEOUT
-1;
154 static void xfrm_policy_timer(unsigned long data
)
156 struct xfrm_policy
*xp
= (struct xfrm_policy
*)data
;
157 unsigned long now
= (unsigned long)xtime
.tv_sec
;
158 long next
= LONG_MAX
;
162 read_lock(&xp
->lock
);
167 dir
= xfrm_policy_id2dir(xp
->index
);
169 if (xp
->lft
.hard_add_expires_seconds
) {
170 long tmo
= xp
->lft
.hard_add_expires_seconds
+
171 xp
->curlft
.add_time
- now
;
177 if (xp
->lft
.hard_use_expires_seconds
) {
178 long tmo
= xp
->lft
.hard_use_expires_seconds
+
179 (xp
->curlft
.use_time
? : xp
->curlft
.add_time
) - now
;
185 if (xp
->lft
.soft_add_expires_seconds
) {
186 long tmo
= xp
->lft
.soft_add_expires_seconds
+
187 xp
->curlft
.add_time
- now
;
190 tmo
= XFRM_KM_TIMEOUT
;
195 if (xp
->lft
.soft_use_expires_seconds
) {
196 long tmo
= xp
->lft
.soft_use_expires_seconds
+
197 (xp
->curlft
.use_time
? : xp
->curlft
.add_time
) - now
;
200 tmo
= XFRM_KM_TIMEOUT
;
207 km_policy_expired(xp
, dir
, 0);
208 if (next
!= LONG_MAX
&&
209 !mod_timer(&xp
->timer
, jiffies
+ make_jiffies(next
)))
213 read_unlock(&xp
->lock
);
218 read_unlock(&xp
->lock
);
219 if (!xfrm_policy_delete(xp
, dir
))
220 km_policy_expired(xp
, dir
, 1);
225 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
229 struct xfrm_policy
*xfrm_policy_alloc(gfp_t gfp
)
231 struct xfrm_policy
*policy
;
233 policy
= kmalloc(sizeof(struct xfrm_policy
), gfp
);
236 memset(policy
, 0, sizeof(struct xfrm_policy
));
237 atomic_set(&policy
->refcnt
, 1);
238 rwlock_init(&policy
->lock
);
239 init_timer(&policy
->timer
);
240 policy
->timer
.data
= (unsigned long)policy
;
241 policy
->timer
.function
= xfrm_policy_timer
;
245 EXPORT_SYMBOL(xfrm_policy_alloc
);
247 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
249 void __xfrm_policy_destroy(struct xfrm_policy
*policy
)
257 if (del_timer(&policy
->timer
))
260 security_xfrm_policy_free(policy
);
263 EXPORT_SYMBOL(__xfrm_policy_destroy
);
265 static void xfrm_policy_gc_kill(struct xfrm_policy
*policy
)
267 struct dst_entry
*dst
;
269 while ((dst
= policy
->bundles
) != NULL
) {
270 policy
->bundles
= dst
->next
;
274 if (del_timer(&policy
->timer
))
275 atomic_dec(&policy
->refcnt
);
277 if (atomic_read(&policy
->refcnt
) > 1)
280 xfrm_pol_put(policy
);
283 static void xfrm_policy_gc_task(void *data
)
285 struct xfrm_policy
*policy
;
286 struct list_head
*entry
, *tmp
;
287 struct list_head gc_list
= LIST_HEAD_INIT(gc_list
);
289 spin_lock_bh(&xfrm_policy_gc_lock
);
290 list_splice_init(&xfrm_policy_gc_list
, &gc_list
);
291 spin_unlock_bh(&xfrm_policy_gc_lock
);
293 list_for_each_safe(entry
, tmp
, &gc_list
) {
294 policy
= list_entry(entry
, struct xfrm_policy
, list
);
295 xfrm_policy_gc_kill(policy
);
299 /* Rule must be locked. Release descentant resources, announce
300 * entry dead. The rule must be unlinked from lists to the moment.
303 static void xfrm_policy_kill(struct xfrm_policy
*policy
)
307 write_lock_bh(&policy
->lock
);
310 write_unlock_bh(&policy
->lock
);
312 if (unlikely(dead
)) {
317 spin_lock(&xfrm_policy_gc_lock
);
318 list_add(&policy
->list
, &xfrm_policy_gc_list
);
319 spin_unlock(&xfrm_policy_gc_lock
);
321 schedule_work(&xfrm_policy_gc_work
);
324 /* Generate new index... KAME seems to generate them ordered by cost
325 * of an absolute inpredictability of ordering of rules. This will not pass. */
326 static u32
xfrm_gen_index(int dir
)
329 struct xfrm_policy
*p
;
330 static u32 idx_generator
;
333 idx
= (idx_generator
| dir
);
337 for (p
= xfrm_policy_list
[dir
]; p
; p
= p
->next
) {
346 int xfrm_policy_insert(int dir
, struct xfrm_policy
*policy
, int excl
)
348 struct xfrm_policy
*pol
, **p
;
349 struct xfrm_policy
*delpol
= NULL
;
350 struct xfrm_policy
**newpos
= NULL
;
351 struct dst_entry
*gc_list
;
353 write_lock_bh(&xfrm_policy_lock
);
354 for (p
= &xfrm_policy_list
[dir
]; (pol
=*p
)!=NULL
;) {
355 if (!delpol
&& memcmp(&policy
->selector
, &pol
->selector
, sizeof(pol
->selector
)) == 0 &&
356 xfrm_sec_ctx_match(pol
->security
, policy
->security
)) {
358 write_unlock_bh(&xfrm_policy_lock
);
363 if (policy
->priority
> pol
->priority
)
365 } else if (policy
->priority
>= pol
->priority
) {
377 xfrm_pol_hold(policy
);
380 atomic_inc(&flow_cache_genid
);
381 policy
->index
= delpol
? delpol
->index
: xfrm_gen_index(dir
);
382 policy
->curlft
.add_time
= (unsigned long)xtime
.tv_sec
;
383 policy
->curlft
.use_time
= 0;
384 if (!mod_timer(&policy
->timer
, jiffies
+ HZ
))
385 xfrm_pol_hold(policy
);
386 write_unlock_bh(&xfrm_policy_lock
);
389 xfrm_policy_kill(delpol
);
391 read_lock_bh(&xfrm_policy_lock
);
393 for (policy
= policy
->next
; policy
; policy
= policy
->next
) {
394 struct dst_entry
*dst
;
396 write_lock(&policy
->lock
);
397 dst
= policy
->bundles
;
399 struct dst_entry
*tail
= dst
;
402 tail
->next
= gc_list
;
405 policy
->bundles
= NULL
;
407 write_unlock(&policy
->lock
);
409 read_unlock_bh(&xfrm_policy_lock
);
412 struct dst_entry
*dst
= gc_list
;
420 EXPORT_SYMBOL(xfrm_policy_insert
);
422 struct xfrm_policy
*xfrm_policy_bysel_ctx(int dir
, struct xfrm_selector
*sel
,
423 struct xfrm_sec_ctx
*ctx
, int delete)
425 struct xfrm_policy
*pol
, **p
;
427 write_lock_bh(&xfrm_policy_lock
);
428 for (p
= &xfrm_policy_list
[dir
]; (pol
=*p
)!=NULL
; p
= &pol
->next
) {
429 if ((memcmp(sel
, &pol
->selector
, sizeof(*sel
)) == 0) &&
430 (xfrm_sec_ctx_match(ctx
, pol
->security
))) {
437 write_unlock_bh(&xfrm_policy_lock
);
440 atomic_inc(&flow_cache_genid
);
441 xfrm_policy_kill(pol
);
445 EXPORT_SYMBOL(xfrm_policy_bysel_ctx
);
447 struct xfrm_policy
*xfrm_policy_byid(int dir
, u32 id
, int delete)
449 struct xfrm_policy
*pol
, **p
;
451 write_lock_bh(&xfrm_policy_lock
);
452 for (p
= &xfrm_policy_list
[dir
]; (pol
=*p
)!=NULL
; p
= &pol
->next
) {
453 if (pol
->index
== id
) {
460 write_unlock_bh(&xfrm_policy_lock
);
463 atomic_inc(&flow_cache_genid
);
464 xfrm_policy_kill(pol
);
468 EXPORT_SYMBOL(xfrm_policy_byid
);
470 void xfrm_policy_flush(void)
472 struct xfrm_policy
*xp
;
475 write_lock_bh(&xfrm_policy_lock
);
476 for (dir
= 0; dir
< XFRM_POLICY_MAX
; dir
++) {
477 while ((xp
= xfrm_policy_list
[dir
]) != NULL
) {
478 xfrm_policy_list
[dir
] = xp
->next
;
479 write_unlock_bh(&xfrm_policy_lock
);
481 xfrm_policy_kill(xp
);
483 write_lock_bh(&xfrm_policy_lock
);
486 atomic_inc(&flow_cache_genid
);
487 write_unlock_bh(&xfrm_policy_lock
);
489 EXPORT_SYMBOL(xfrm_policy_flush
);
491 int xfrm_policy_walk(int (*func
)(struct xfrm_policy
*, int, int, void*),
494 struct xfrm_policy
*xp
;
499 read_lock_bh(&xfrm_policy_lock
);
500 for (dir
= 0; dir
< 2*XFRM_POLICY_MAX
; dir
++) {
501 for (xp
= xfrm_policy_list
[dir
]; xp
; xp
= xp
->next
)
510 for (dir
= 0; dir
< 2*XFRM_POLICY_MAX
; dir
++) {
511 for (xp
= xfrm_policy_list
[dir
]; xp
; xp
= xp
->next
) {
512 error
= func(xp
, dir
%XFRM_POLICY_MAX
, --count
, data
);
519 read_unlock_bh(&xfrm_policy_lock
);
522 EXPORT_SYMBOL(xfrm_policy_walk
);
524 /* Find policy to apply to this flow. */
526 static void xfrm_policy_lookup(struct flowi
*fl
, u32 sk_sid
, u16 family
, u8 dir
,
527 void **objp
, atomic_t
**obj_refp
)
529 struct xfrm_policy
*pol
;
531 read_lock_bh(&xfrm_policy_lock
);
532 for (pol
= xfrm_policy_list
[dir
]; pol
; pol
= pol
->next
) {
533 struct xfrm_selector
*sel
= &pol
->selector
;
536 if (pol
->family
!= family
)
539 match
= xfrm_selector_match(sel
, fl
, family
);
542 if (!security_xfrm_policy_lookup(pol
, sk_sid
, dir
)) {
548 read_unlock_bh(&xfrm_policy_lock
);
549 if ((*objp
= (void *) pol
) != NULL
)
550 *obj_refp
= &pol
->refcnt
;
553 static inline int policy_to_flow_dir(int dir
)
555 if (XFRM_POLICY_IN
== FLOW_DIR_IN
&&
556 XFRM_POLICY_OUT
== FLOW_DIR_OUT
&&
557 XFRM_POLICY_FWD
== FLOW_DIR_FWD
)
563 case XFRM_POLICY_OUT
:
565 case XFRM_POLICY_FWD
:
570 static struct xfrm_policy
*xfrm_sk_policy_lookup(struct sock
*sk
, int dir
, struct flowi
*fl
, u32 sk_sid
)
572 struct xfrm_policy
*pol
;
574 read_lock_bh(&xfrm_policy_lock
);
575 if ((pol
= sk
->sk_policy
[dir
]) != NULL
) {
576 int match
= xfrm_selector_match(&pol
->selector
, fl
,
581 err
= security_xfrm_policy_lookup(pol
, sk_sid
, policy_to_flow_dir(dir
));
588 read_unlock_bh(&xfrm_policy_lock
);
592 static void __xfrm_policy_link(struct xfrm_policy
*pol
, int dir
)
594 pol
->next
= xfrm_policy_list
[dir
];
595 xfrm_policy_list
[dir
] = pol
;
599 static struct xfrm_policy
*__xfrm_policy_unlink(struct xfrm_policy
*pol
,
602 struct xfrm_policy
**polp
;
604 for (polp
= &xfrm_policy_list
[dir
];
605 *polp
!= NULL
; polp
= &(*polp
)->next
) {
614 int xfrm_policy_delete(struct xfrm_policy
*pol
, int dir
)
616 write_lock_bh(&xfrm_policy_lock
);
617 pol
= __xfrm_policy_unlink(pol
, dir
);
618 write_unlock_bh(&xfrm_policy_lock
);
620 if (dir
< XFRM_POLICY_MAX
)
621 atomic_inc(&flow_cache_genid
);
622 xfrm_policy_kill(pol
);
628 int xfrm_sk_policy_insert(struct sock
*sk
, int dir
, struct xfrm_policy
*pol
)
630 struct xfrm_policy
*old_pol
;
632 write_lock_bh(&xfrm_policy_lock
);
633 old_pol
= sk
->sk_policy
[dir
];
634 sk
->sk_policy
[dir
] = pol
;
636 pol
->curlft
.add_time
= (unsigned long)xtime
.tv_sec
;
637 pol
->index
= xfrm_gen_index(XFRM_POLICY_MAX
+dir
);
638 __xfrm_policy_link(pol
, XFRM_POLICY_MAX
+dir
);
641 __xfrm_policy_unlink(old_pol
, XFRM_POLICY_MAX
+dir
);
642 write_unlock_bh(&xfrm_policy_lock
);
645 xfrm_policy_kill(old_pol
);
650 static struct xfrm_policy
*clone_policy(struct xfrm_policy
*old
, int dir
)
652 struct xfrm_policy
*newp
= xfrm_policy_alloc(GFP_ATOMIC
);
655 newp
->selector
= old
->selector
;
656 if (security_xfrm_policy_clone(old
, newp
)) {
658 return NULL
; /* ENOMEM */
660 newp
->lft
= old
->lft
;
661 newp
->curlft
= old
->curlft
;
662 newp
->action
= old
->action
;
663 newp
->flags
= old
->flags
;
664 newp
->xfrm_nr
= old
->xfrm_nr
;
665 newp
->index
= old
->index
;
666 memcpy(newp
->xfrm_vec
, old
->xfrm_vec
,
667 newp
->xfrm_nr
*sizeof(struct xfrm_tmpl
));
668 write_lock_bh(&xfrm_policy_lock
);
669 __xfrm_policy_link(newp
, XFRM_POLICY_MAX
+dir
);
670 write_unlock_bh(&xfrm_policy_lock
);
676 int __xfrm_sk_clone_policy(struct sock
*sk
)
678 struct xfrm_policy
*p0
= sk
->sk_policy
[0],
679 *p1
= sk
->sk_policy
[1];
681 sk
->sk_policy
[0] = sk
->sk_policy
[1] = NULL
;
682 if (p0
&& (sk
->sk_policy
[0] = clone_policy(p0
, 0)) == NULL
)
684 if (p1
&& (sk
->sk_policy
[1] = clone_policy(p1
, 1)) == NULL
)
689 /* Resolve list of templates for the flow, given policy. */
692 xfrm_tmpl_resolve(struct xfrm_policy
*policy
, struct flowi
*fl
,
693 struct xfrm_state
**xfrm
,
694 unsigned short family
)
698 xfrm_address_t
*daddr
= xfrm_flowi_daddr(fl
, family
);
699 xfrm_address_t
*saddr
= xfrm_flowi_saddr(fl
, family
);
701 for (nx
=0, i
= 0; i
< policy
->xfrm_nr
; i
++) {
702 struct xfrm_state
*x
;
703 xfrm_address_t
*remote
= daddr
;
704 xfrm_address_t
*local
= saddr
;
705 struct xfrm_tmpl
*tmpl
= &policy
->xfrm_vec
[i
];
708 remote
= &tmpl
->id
.daddr
;
709 local
= &tmpl
->saddr
;
712 x
= xfrm_state_find(remote
, local
, fl
, tmpl
, policy
, &error
, family
);
714 if (x
&& x
->km
.state
== XFRM_STATE_VALID
) {
721 error
= (x
->km
.state
== XFRM_STATE_ERROR
?
732 for (nx
--; nx
>=0; nx
--)
733 xfrm_state_put(xfrm
[nx
]);
737 /* Check that the bundle accepts the flow and its components are
741 static struct dst_entry
*
742 xfrm_find_bundle(struct flowi
*fl
, struct xfrm_policy
*policy
, unsigned short family
)
745 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
746 if (unlikely(afinfo
== NULL
))
747 return ERR_PTR(-EINVAL
);
748 x
= afinfo
->find_bundle(fl
, policy
);
749 xfrm_policy_put_afinfo(afinfo
);
753 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
754 * all the metrics... Shortly, bundle a bundle.
758 xfrm_bundle_create(struct xfrm_policy
*policy
, struct xfrm_state
**xfrm
, int nx
,
759 struct flowi
*fl
, struct dst_entry
**dst_p
,
760 unsigned short family
)
763 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
764 if (unlikely(afinfo
== NULL
))
766 err
= afinfo
->bundle_create(policy
, xfrm
, nx
, fl
, dst_p
);
767 xfrm_policy_put_afinfo(afinfo
);
772 static int stale_bundle(struct dst_entry
*dst
);
774 /* Main function: finds/creates a bundle for given flow.
776 * At the moment we eat a raw IP route. Mostly to speed up lookups
777 * on interfaces with disabled IPsec.
779 int xfrm_lookup(struct dst_entry
**dst_p
, struct flowi
*fl
,
780 struct sock
*sk
, int flags
)
782 struct xfrm_policy
*policy
;
783 struct xfrm_state
*xfrm
[XFRM_MAX_DEPTH
];
784 struct dst_entry
*dst
, *dst_orig
= *dst_p
;
788 u16 family
= dst_orig
->ops
->family
;
789 u8 dir
= policy_to_flow_dir(XFRM_POLICY_OUT
);
790 u32 sk_sid
= security_sk_sid(sk
, fl
, dir
);
792 genid
= atomic_read(&flow_cache_genid
);
794 if (sk
&& sk
->sk_policy
[1])
795 policy
= xfrm_sk_policy_lookup(sk
, XFRM_POLICY_OUT
, fl
, sk_sid
);
798 /* To accelerate a bit... */
799 if ((dst_orig
->flags
& DST_NOXFRM
) || !xfrm_policy_list
[XFRM_POLICY_OUT
])
802 policy
= flow_cache_lookup(fl
, sk_sid
, family
, dir
,
809 policy
->curlft
.use_time
= (unsigned long)xtime
.tv_sec
;
811 switch (policy
->action
) {
812 case XFRM_POLICY_BLOCK
:
813 /* Prohibit the flow */
817 case XFRM_POLICY_ALLOW
:
818 if (policy
->xfrm_nr
== 0) {
819 /* Flow passes not transformed. */
820 xfrm_pol_put(policy
);
824 /* Try to find matching bundle.
826 * LATER: help from flow cache. It is optional, this
827 * is required only for output policy.
829 dst
= xfrm_find_bundle(fl
, policy
, family
);
838 nx
= xfrm_tmpl_resolve(policy
, fl
, xfrm
, family
);
840 if (unlikely(nx
<0)) {
842 if (err
== -EAGAIN
&& flags
) {
843 DECLARE_WAITQUEUE(wait
, current
);
845 add_wait_queue(&km_waitq
, &wait
);
846 set_current_state(TASK_INTERRUPTIBLE
);
848 set_current_state(TASK_RUNNING
);
849 remove_wait_queue(&km_waitq
, &wait
);
851 nx
= xfrm_tmpl_resolve(policy
, fl
, xfrm
, family
);
853 if (nx
== -EAGAIN
&& signal_pending(current
)) {
858 genid
!= atomic_read(&flow_cache_genid
)) {
859 xfrm_pol_put(policy
);
868 /* Flow passes not transformed. */
869 xfrm_pol_put(policy
);
874 err
= xfrm_bundle_create(policy
, xfrm
, nx
, fl
, &dst
, family
);
879 xfrm_state_put(xfrm
[i
]);
883 write_lock_bh(&policy
->lock
);
884 if (unlikely(policy
->dead
|| stale_bundle(dst
))) {
885 /* Wow! While we worked on resolving, this
886 * policy has gone. Retry. It is not paranoia,
887 * we just cannot enlist new bundle to dead object.
888 * We can't enlist stable bundles either.
890 write_unlock_bh(&policy
->lock
);
892 xfrm_pol_put(policy
);
897 dst
->next
= policy
->bundles
;
898 policy
->bundles
= dst
;
900 write_unlock_bh(&policy
->lock
);
903 dst_release(dst_orig
);
904 xfrm_pol_put(policy
);
908 dst_release(dst_orig
);
909 xfrm_pol_put(policy
);
913 EXPORT_SYMBOL(xfrm_lookup
);
915 /* When skb is transformed back to its "native" form, we have to
916 * check policy restrictions. At the moment we make this in maximally
917 * stupid way. Shame on me. :-) Of course, connected sockets must
918 * have policy cached at them.
922 xfrm_state_ok(struct xfrm_tmpl
*tmpl
, struct xfrm_state
*x
,
923 unsigned short family
)
925 if (xfrm_state_kern(x
))
926 return tmpl
->optional
&& !xfrm_state_addr_cmp(tmpl
, x
, family
);
927 return x
->id
.proto
== tmpl
->id
.proto
&&
928 (x
->id
.spi
== tmpl
->id
.spi
|| !tmpl
->id
.spi
) &&
929 (x
->props
.reqid
== tmpl
->reqid
|| !tmpl
->reqid
) &&
930 x
->props
.mode
== tmpl
->mode
&&
931 (tmpl
->aalgos
& (1<<x
->props
.aalgo
)) &&
932 !(x
->props
.mode
&& xfrm_state_addr_cmp(tmpl
, x
, family
));
936 xfrm_policy_ok(struct xfrm_tmpl
*tmpl
, struct sec_path
*sp
, int start
,
937 unsigned short family
)
941 if (tmpl
->optional
) {
946 for (; idx
< sp
->len
; idx
++) {
947 if (xfrm_state_ok(tmpl
, sp
->x
[idx
].xvec
, family
))
949 if (sp
->x
[idx
].xvec
->props
.mode
)
956 xfrm_decode_session(struct sk_buff
*skb
, struct flowi
*fl
, unsigned short family
)
958 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
960 if (unlikely(afinfo
== NULL
))
961 return -EAFNOSUPPORT
;
963 afinfo
->decode_session(skb
, fl
);
964 xfrm_policy_put_afinfo(afinfo
);
967 EXPORT_SYMBOL(xfrm_decode_session
);
969 static inline int secpath_has_tunnel(struct sec_path
*sp
, int k
)
971 for (; k
< sp
->len
; k
++) {
972 if (sp
->x
[k
].xvec
->props
.mode
)
979 int __xfrm_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
,
980 unsigned short family
)
982 struct xfrm_policy
*pol
;
984 u8 fl_dir
= policy_to_flow_dir(dir
);
987 if (xfrm_decode_session(skb
, &fl
, family
) < 0)
989 nf_nat_decode_session(skb
, &fl
, family
);
991 sk_sid
= security_sk_sid(sk
, &fl
, fl_dir
);
993 /* First, check used SA against their selectors. */
997 for (i
=skb
->sp
->len
-1; i
>=0; i
--) {
998 struct sec_decap_state
*xvec
= &(skb
->sp
->x
[i
]);
999 if (!xfrm_selector_match(&xvec
->xvec
->sel
, &fl
, family
))
1002 /* If there is a post_input processor, try running it */
1003 if (xvec
->xvec
->type
->post_input
&&
1004 (xvec
->xvec
->type
->post_input
)(xvec
->xvec
,
1012 if (sk
&& sk
->sk_policy
[dir
])
1013 pol
= xfrm_sk_policy_lookup(sk
, dir
, &fl
, sk_sid
);
1016 pol
= flow_cache_lookup(&fl
, sk_sid
, family
, fl_dir
,
1017 xfrm_policy_lookup
);
1020 return !skb
->sp
|| !secpath_has_tunnel(skb
->sp
, 0);
1022 pol
->curlft
.use_time
= (unsigned long)xtime
.tv_sec
;
1024 if (pol
->action
== XFRM_POLICY_ALLOW
) {
1025 struct sec_path
*sp
;
1026 static struct sec_path dummy
;
1029 if ((sp
= skb
->sp
) == NULL
)
1032 /* For each tunnel xfrm, find the first matching tmpl.
1033 * For each tmpl before that, find corresponding xfrm.
1034 * Order is _important_. Later we will implement
1035 * some barriers, but at the moment barriers
1036 * are implied between each two transformations.
1038 for (i
= pol
->xfrm_nr
-1, k
= 0; i
>= 0; i
--) {
1039 k
= xfrm_policy_ok(pol
->xfrm_vec
+i
, sp
, k
, family
);
1044 if (secpath_has_tunnel(sp
, k
))
1055 EXPORT_SYMBOL(__xfrm_policy_check
);
1057 int __xfrm_route_forward(struct sk_buff
*skb
, unsigned short family
)
1061 if (xfrm_decode_session(skb
, &fl
, family
) < 0)
1064 return xfrm_lookup(&skb
->dst
, &fl
, NULL
, 0) == 0;
1066 EXPORT_SYMBOL(__xfrm_route_forward
);
1068 static struct dst_entry
*xfrm_dst_check(struct dst_entry
*dst
, u32 cookie
)
1070 /* If it is marked obsolete, which is how we even get here,
1071 * then we have purged it from the policy bundle list and we
1072 * did that for a good reason.
1077 static int stale_bundle(struct dst_entry
*dst
)
1079 return !xfrm_bundle_ok((struct xfrm_dst
*)dst
, NULL
, AF_UNSPEC
);
1082 void xfrm_dst_ifdown(struct dst_entry
*dst
, struct net_device
*dev
)
1084 while ((dst
= dst
->child
) && dst
->xfrm
&& dst
->dev
== dev
) {
1085 dst
->dev
= &loopback_dev
;
1086 dev_hold(&loopback_dev
);
1090 EXPORT_SYMBOL(xfrm_dst_ifdown
);
1092 static void xfrm_link_failure(struct sk_buff
*skb
)
1094 /* Impossible. Such dst must be popped before reaches point of failure. */
1098 static struct dst_entry
*xfrm_negative_advice(struct dst_entry
*dst
)
1101 if (dst
->obsolete
) {
1109 static void xfrm_prune_bundles(int (*func
)(struct dst_entry
*))
1112 struct xfrm_policy
*pol
;
1113 struct dst_entry
*dst
, **dstp
, *gc_list
= NULL
;
1115 read_lock_bh(&xfrm_policy_lock
);
1116 for (i
=0; i
<2*XFRM_POLICY_MAX
; i
++) {
1117 for (pol
= xfrm_policy_list
[i
]; pol
; pol
= pol
->next
) {
1118 write_lock(&pol
->lock
);
1119 dstp
= &pol
->bundles
;
1120 while ((dst
=*dstp
) != NULL
) {
1123 dst
->next
= gc_list
;
1129 write_unlock(&pol
->lock
);
1132 read_unlock_bh(&xfrm_policy_lock
);
1136 gc_list
= dst
->next
;
1141 static int unused_bundle(struct dst_entry
*dst
)
1143 return !atomic_read(&dst
->__refcnt
);
1146 static void __xfrm_garbage_collect(void)
1148 xfrm_prune_bundles(unused_bundle
);
1151 int xfrm_flush_bundles(void)
1153 xfrm_prune_bundles(stale_bundle
);
1157 static int always_true(struct dst_entry
*dst
)
1162 void xfrm_flush_all_bundles(void)
1164 xfrm_prune_bundles(always_true
);
1167 void xfrm_init_pmtu(struct dst_entry
*dst
)
1170 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
1171 u32 pmtu
, route_mtu_cached
;
1173 pmtu
= dst_mtu(dst
->child
);
1174 xdst
->child_mtu_cached
= pmtu
;
1176 pmtu
= xfrm_state_mtu(dst
->xfrm
, pmtu
);
1178 route_mtu_cached
= dst_mtu(xdst
->route
);
1179 xdst
->route_mtu_cached
= route_mtu_cached
;
1181 if (pmtu
> route_mtu_cached
)
1182 pmtu
= route_mtu_cached
;
1184 dst
->metrics
[RTAX_MTU
-1] = pmtu
;
1185 } while ((dst
= dst
->next
));
1188 EXPORT_SYMBOL(xfrm_init_pmtu
);
1190 /* Check that the bundle accepts the flow and its components are
1194 int xfrm_bundle_ok(struct xfrm_dst
*first
, struct flowi
*fl
, int family
)
1196 struct dst_entry
*dst
= &first
->u
.dst
;
1197 struct xfrm_dst
*last
;
1200 if (!dst_check(dst
->path
, ((struct xfrm_dst
*)dst
)->path_cookie
) ||
1201 (dst
->dev
&& !netif_running(dst
->dev
)))
1207 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
1209 if (fl
&& !xfrm_selector_match(&dst
->xfrm
->sel
, fl
, family
))
1211 if (dst
->xfrm
->km
.state
!= XFRM_STATE_VALID
)
1214 mtu
= dst_mtu(dst
->child
);
1215 if (xdst
->child_mtu_cached
!= mtu
) {
1217 xdst
->child_mtu_cached
= mtu
;
1220 if (!dst_check(xdst
->route
, xdst
->route_cookie
))
1222 mtu
= dst_mtu(xdst
->route
);
1223 if (xdst
->route_mtu_cached
!= mtu
) {
1225 xdst
->route_mtu_cached
= mtu
;
1229 } while (dst
->xfrm
);
1234 mtu
= last
->child_mtu_cached
;
1238 mtu
= xfrm_state_mtu(dst
->xfrm
, mtu
);
1239 if (mtu
> last
->route_mtu_cached
)
1240 mtu
= last
->route_mtu_cached
;
1241 dst
->metrics
[RTAX_MTU
-1] = mtu
;
1246 last
= last
->u
.next
;
1247 last
->child_mtu_cached
= mtu
;
1253 EXPORT_SYMBOL(xfrm_bundle_ok
);
1255 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo
*afinfo
)
1258 if (unlikely(afinfo
== NULL
))
1260 if (unlikely(afinfo
->family
>= NPROTO
))
1261 return -EAFNOSUPPORT
;
1262 write_lock(&xfrm_policy_afinfo_lock
);
1263 if (unlikely(xfrm_policy_afinfo
[afinfo
->family
] != NULL
))
1266 struct dst_ops
*dst_ops
= afinfo
->dst_ops
;
1267 if (likely(dst_ops
->kmem_cachep
== NULL
))
1268 dst_ops
->kmem_cachep
= xfrm_dst_cache
;
1269 if (likely(dst_ops
->check
== NULL
))
1270 dst_ops
->check
= xfrm_dst_check
;
1271 if (likely(dst_ops
->negative_advice
== NULL
))
1272 dst_ops
->negative_advice
= xfrm_negative_advice
;
1273 if (likely(dst_ops
->link_failure
== NULL
))
1274 dst_ops
->link_failure
= xfrm_link_failure
;
1275 if (likely(afinfo
->garbage_collect
== NULL
))
1276 afinfo
->garbage_collect
= __xfrm_garbage_collect
;
1277 xfrm_policy_afinfo
[afinfo
->family
] = afinfo
;
1279 write_unlock(&xfrm_policy_afinfo_lock
);
1282 EXPORT_SYMBOL(xfrm_policy_register_afinfo
);
1284 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo
*afinfo
)
1287 if (unlikely(afinfo
== NULL
))
1289 if (unlikely(afinfo
->family
>= NPROTO
))
1290 return -EAFNOSUPPORT
;
1291 write_lock(&xfrm_policy_afinfo_lock
);
1292 if (likely(xfrm_policy_afinfo
[afinfo
->family
] != NULL
)) {
1293 if (unlikely(xfrm_policy_afinfo
[afinfo
->family
] != afinfo
))
1296 struct dst_ops
*dst_ops
= afinfo
->dst_ops
;
1297 xfrm_policy_afinfo
[afinfo
->family
] = NULL
;
1298 dst_ops
->kmem_cachep
= NULL
;
1299 dst_ops
->check
= NULL
;
1300 dst_ops
->negative_advice
= NULL
;
1301 dst_ops
->link_failure
= NULL
;
1302 afinfo
->garbage_collect
= NULL
;
1305 write_unlock(&xfrm_policy_afinfo_lock
);
1308 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo
);
1310 static struct xfrm_policy_afinfo
*xfrm_policy_get_afinfo(unsigned short family
)
1312 struct xfrm_policy_afinfo
*afinfo
;
1313 if (unlikely(family
>= NPROTO
))
1315 read_lock(&xfrm_policy_afinfo_lock
);
1316 afinfo
= xfrm_policy_afinfo
[family
];
1317 if (likely(afinfo
!= NULL
))
1318 read_lock(&afinfo
->lock
);
1319 read_unlock(&xfrm_policy_afinfo_lock
);
1323 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo
*afinfo
)
1325 if (unlikely(afinfo
== NULL
))
1327 read_unlock(&afinfo
->lock
);
1330 static int xfrm_dev_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1334 xfrm_flush_bundles();
1339 static struct notifier_block xfrm_dev_notifier
= {
1345 static void __init
xfrm_policy_init(void)
1347 xfrm_dst_cache
= kmem_cache_create("xfrm_dst_cache",
1348 sizeof(struct xfrm_dst
),
1349 0, SLAB_HWCACHE_ALIGN
,
1351 if (!xfrm_dst_cache
)
1352 panic("XFRM: failed to allocate xfrm_dst_cache\n");
1354 INIT_WORK(&xfrm_policy_gc_work
, xfrm_policy_gc_task
, NULL
);
1355 register_netdevice_notifier(&xfrm_dev_notifier
);
1358 void __init
xfrm_init(void)