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
16 #include <linux/err.h>
17 #include <linux/slab.h>
18 #include <linux/kmod.h>
19 #include <linux/list.h>
20 #include <linux/spinlock.h>
21 #include <linux/workqueue.h>
22 #include <linux/notifier.h>
23 #include <linux/netdevice.h>
24 #include <linux/netfilter.h>
25 #include <linux/module.h>
26 #include <linux/cache.h>
27 #include <linux/audit.h>
31 #ifdef CONFIG_XFRM_STATISTICS
35 #include "xfrm_hash.h"
37 DEFINE_MUTEX(xfrm_cfg_mutex
);
38 EXPORT_SYMBOL(xfrm_cfg_mutex
);
40 static DEFINE_RWLOCK(xfrm_policy_lock
);
42 static DEFINE_RWLOCK(xfrm_policy_afinfo_lock
);
43 static struct xfrm_policy_afinfo
*xfrm_policy_afinfo
[NPROTO
];
45 static struct kmem_cache
*xfrm_dst_cache __read_mostly
;
47 static HLIST_HEAD(xfrm_policy_gc_list
);
48 static DEFINE_SPINLOCK(xfrm_policy_gc_lock
);
50 static struct xfrm_policy_afinfo
*xfrm_policy_get_afinfo(unsigned short family
);
51 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo
*afinfo
);
52 static void xfrm_init_pmtu(struct dst_entry
*dst
);
54 static struct xfrm_policy
*__xfrm_policy_unlink(struct xfrm_policy
*pol
,
58 __xfrm4_selector_match(struct xfrm_selector
*sel
, struct flowi
*fl
)
60 return addr_match(&fl
->fl4_dst
, &sel
->daddr
, sel
->prefixlen_d
) &&
61 addr_match(&fl
->fl4_src
, &sel
->saddr
, sel
->prefixlen_s
) &&
62 !((xfrm_flowi_dport(fl
) ^ sel
->dport
) & sel
->dport_mask
) &&
63 !((xfrm_flowi_sport(fl
) ^ sel
->sport
) & sel
->sport_mask
) &&
64 (fl
->proto
== sel
->proto
|| !sel
->proto
) &&
65 (fl
->oif
== sel
->ifindex
|| !sel
->ifindex
);
69 __xfrm6_selector_match(struct xfrm_selector
*sel
, struct flowi
*fl
)
71 return addr_match(&fl
->fl6_dst
, &sel
->daddr
, sel
->prefixlen_d
) &&
72 addr_match(&fl
->fl6_src
, &sel
->saddr
, sel
->prefixlen_s
) &&
73 !((xfrm_flowi_dport(fl
) ^ sel
->dport
) & sel
->dport_mask
) &&
74 !((xfrm_flowi_sport(fl
) ^ sel
->sport
) & sel
->sport_mask
) &&
75 (fl
->proto
== sel
->proto
|| !sel
->proto
) &&
76 (fl
->oif
== sel
->ifindex
|| !sel
->ifindex
);
79 int xfrm_selector_match(struct xfrm_selector
*sel
, struct flowi
*fl
,
80 unsigned short family
)
84 return __xfrm4_selector_match(sel
, fl
);
86 return __xfrm6_selector_match(sel
, fl
);
91 static inline struct dst_entry
*__xfrm_dst_lookup(struct net
*net
, int tos
,
92 xfrm_address_t
*saddr
,
93 xfrm_address_t
*daddr
,
96 struct xfrm_policy_afinfo
*afinfo
;
97 struct dst_entry
*dst
;
99 afinfo
= xfrm_policy_get_afinfo(family
);
100 if (unlikely(afinfo
== NULL
))
101 return ERR_PTR(-EAFNOSUPPORT
);
103 dst
= afinfo
->dst_lookup(net
, tos
, saddr
, daddr
);
105 xfrm_policy_put_afinfo(afinfo
);
110 static inline struct dst_entry
*xfrm_dst_lookup(struct xfrm_state
*x
, int tos
,
111 xfrm_address_t
*prev_saddr
,
112 xfrm_address_t
*prev_daddr
,
115 struct net
*net
= xs_net(x
);
116 xfrm_address_t
*saddr
= &x
->props
.saddr
;
117 xfrm_address_t
*daddr
= &x
->id
.daddr
;
118 struct dst_entry
*dst
;
120 if (x
->type
->flags
& XFRM_TYPE_LOCAL_COADDR
) {
124 if (x
->type
->flags
& XFRM_TYPE_REMOTE_COADDR
) {
129 dst
= __xfrm_dst_lookup(net
, tos
, saddr
, daddr
, family
);
132 if (prev_saddr
!= saddr
)
133 memcpy(prev_saddr
, saddr
, sizeof(*prev_saddr
));
134 if (prev_daddr
!= daddr
)
135 memcpy(prev_daddr
, daddr
, sizeof(*prev_daddr
));
141 static inline unsigned long make_jiffies(long secs
)
143 if (secs
>= (MAX_SCHEDULE_TIMEOUT
-1)/HZ
)
144 return MAX_SCHEDULE_TIMEOUT
-1;
149 static void xfrm_policy_timer(unsigned long data
)
151 struct xfrm_policy
*xp
= (struct xfrm_policy
*)data
;
152 unsigned long now
= get_seconds();
153 long next
= LONG_MAX
;
157 read_lock(&xp
->lock
);
162 dir
= xfrm_policy_id2dir(xp
->index
);
164 if (xp
->lft
.hard_add_expires_seconds
) {
165 long tmo
= xp
->lft
.hard_add_expires_seconds
+
166 xp
->curlft
.add_time
- now
;
172 if (xp
->lft
.hard_use_expires_seconds
) {
173 long tmo
= xp
->lft
.hard_use_expires_seconds
+
174 (xp
->curlft
.use_time
? : xp
->curlft
.add_time
) - now
;
180 if (xp
->lft
.soft_add_expires_seconds
) {
181 long tmo
= xp
->lft
.soft_add_expires_seconds
+
182 xp
->curlft
.add_time
- now
;
185 tmo
= XFRM_KM_TIMEOUT
;
190 if (xp
->lft
.soft_use_expires_seconds
) {
191 long tmo
= xp
->lft
.soft_use_expires_seconds
+
192 (xp
->curlft
.use_time
? : xp
->curlft
.add_time
) - now
;
195 tmo
= XFRM_KM_TIMEOUT
;
202 km_policy_expired(xp
, dir
, 0, 0);
203 if (next
!= LONG_MAX
&&
204 !mod_timer(&xp
->timer
, jiffies
+ make_jiffies(next
)))
208 read_unlock(&xp
->lock
);
213 read_unlock(&xp
->lock
);
214 if (!xfrm_policy_delete(xp
, dir
))
215 km_policy_expired(xp
, dir
, 1, 0);
220 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
224 struct xfrm_policy
*xfrm_policy_alloc(struct net
*net
, gfp_t gfp
)
226 struct xfrm_policy
*policy
;
228 policy
= kzalloc(sizeof(struct xfrm_policy
), gfp
);
231 write_pnet(&policy
->xp_net
, net
);
232 INIT_LIST_HEAD(&policy
->walk
.all
);
233 INIT_HLIST_NODE(&policy
->bydst
);
234 INIT_HLIST_NODE(&policy
->byidx
);
235 rwlock_init(&policy
->lock
);
236 atomic_set(&policy
->refcnt
, 1);
237 setup_timer(&policy
->timer
, xfrm_policy_timer
,
238 (unsigned long)policy
);
242 EXPORT_SYMBOL(xfrm_policy_alloc
);
244 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
246 void xfrm_policy_destroy(struct xfrm_policy
*policy
)
248 BUG_ON(!policy
->walk
.dead
);
250 BUG_ON(policy
->bundles
);
252 if (del_timer(&policy
->timer
))
255 security_xfrm_policy_free(policy
->security
);
258 EXPORT_SYMBOL(xfrm_policy_destroy
);
260 static void xfrm_policy_gc_kill(struct xfrm_policy
*policy
)
262 struct dst_entry
*dst
;
264 while ((dst
= policy
->bundles
) != NULL
) {
265 policy
->bundles
= dst
->next
;
269 if (del_timer(&policy
->timer
))
270 atomic_dec(&policy
->refcnt
);
272 if (atomic_read(&policy
->refcnt
) > 1)
275 xfrm_pol_put(policy
);
278 static void xfrm_policy_gc_task(struct work_struct
*work
)
280 struct xfrm_policy
*policy
;
281 struct hlist_node
*entry
, *tmp
;
282 struct hlist_head gc_list
;
284 spin_lock_bh(&xfrm_policy_gc_lock
);
285 gc_list
.first
= xfrm_policy_gc_list
.first
;
286 INIT_HLIST_HEAD(&xfrm_policy_gc_list
);
287 spin_unlock_bh(&xfrm_policy_gc_lock
);
289 hlist_for_each_entry_safe(policy
, entry
, tmp
, &gc_list
, bydst
)
290 xfrm_policy_gc_kill(policy
);
292 static DECLARE_WORK(xfrm_policy_gc_work
, xfrm_policy_gc_task
);
294 /* Rule must be locked. Release descentant resources, announce
295 * entry dead. The rule must be unlinked from lists to the moment.
298 static void xfrm_policy_kill(struct xfrm_policy
*policy
)
302 write_lock_bh(&policy
->lock
);
303 dead
= policy
->walk
.dead
;
304 policy
->walk
.dead
= 1;
305 write_unlock_bh(&policy
->lock
);
307 if (unlikely(dead
)) {
312 spin_lock_bh(&xfrm_policy_gc_lock
);
313 hlist_add_head(&policy
->bydst
, &xfrm_policy_gc_list
);
314 spin_unlock_bh(&xfrm_policy_gc_lock
);
316 schedule_work(&xfrm_policy_gc_work
);
319 static unsigned int xfrm_policy_hashmax __read_mostly
= 1 * 1024 * 1024;
321 static inline unsigned int idx_hash(struct net
*net
, u32 index
)
323 return __idx_hash(index
, net
->xfrm
.policy_idx_hmask
);
326 static struct hlist_head
*policy_hash_bysel(struct net
*net
, struct xfrm_selector
*sel
, unsigned short family
, int dir
)
328 unsigned int hmask
= net
->xfrm
.policy_bydst
[dir
].hmask
;
329 unsigned int hash
= __sel_hash(sel
, family
, hmask
);
331 return (hash
== hmask
+ 1 ?
332 &net
->xfrm
.policy_inexact
[dir
] :
333 net
->xfrm
.policy_bydst
[dir
].table
+ hash
);
336 static struct hlist_head
*policy_hash_direct(struct net
*net
, xfrm_address_t
*daddr
, xfrm_address_t
*saddr
, unsigned short family
, int dir
)
338 unsigned int hmask
= net
->xfrm
.policy_bydst
[dir
].hmask
;
339 unsigned int hash
= __addr_hash(daddr
, saddr
, family
, hmask
);
341 return net
->xfrm
.policy_bydst
[dir
].table
+ hash
;
344 static void xfrm_dst_hash_transfer(struct hlist_head
*list
,
345 struct hlist_head
*ndsttable
,
346 unsigned int nhashmask
)
348 struct hlist_node
*entry
, *tmp
, *entry0
= NULL
;
349 struct xfrm_policy
*pol
;
353 hlist_for_each_entry_safe(pol
, entry
, tmp
, list
, bydst
) {
356 h
= __addr_hash(&pol
->selector
.daddr
, &pol
->selector
.saddr
,
357 pol
->family
, nhashmask
);
360 hlist_add_head(&pol
->bydst
, ndsttable
+h
);
366 hlist_add_after(entry0
, &pol
->bydst
);
370 if (!hlist_empty(list
)) {
376 static void xfrm_idx_hash_transfer(struct hlist_head
*list
,
377 struct hlist_head
*nidxtable
,
378 unsigned int nhashmask
)
380 struct hlist_node
*entry
, *tmp
;
381 struct xfrm_policy
*pol
;
383 hlist_for_each_entry_safe(pol
, entry
, tmp
, list
, byidx
) {
386 h
= __idx_hash(pol
->index
, nhashmask
);
387 hlist_add_head(&pol
->byidx
, nidxtable
+h
);
391 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask
)
393 return ((old_hmask
+ 1) << 1) - 1;
396 static void xfrm_bydst_resize(struct net
*net
, int dir
)
398 unsigned int hmask
= net
->xfrm
.policy_bydst
[dir
].hmask
;
399 unsigned int nhashmask
= xfrm_new_hash_mask(hmask
);
400 unsigned int nsize
= (nhashmask
+ 1) * sizeof(struct hlist_head
);
401 struct hlist_head
*odst
= net
->xfrm
.policy_bydst
[dir
].table
;
402 struct hlist_head
*ndst
= xfrm_hash_alloc(nsize
);
408 write_lock_bh(&xfrm_policy_lock
);
410 for (i
= hmask
; i
>= 0; i
--)
411 xfrm_dst_hash_transfer(odst
+ i
, ndst
, nhashmask
);
413 net
->xfrm
.policy_bydst
[dir
].table
= ndst
;
414 net
->xfrm
.policy_bydst
[dir
].hmask
= nhashmask
;
416 write_unlock_bh(&xfrm_policy_lock
);
418 xfrm_hash_free(odst
, (hmask
+ 1) * sizeof(struct hlist_head
));
421 static void xfrm_byidx_resize(struct net
*net
, int total
)
423 unsigned int hmask
= net
->xfrm
.policy_idx_hmask
;
424 unsigned int nhashmask
= xfrm_new_hash_mask(hmask
);
425 unsigned int nsize
= (nhashmask
+ 1) * sizeof(struct hlist_head
);
426 struct hlist_head
*oidx
= net
->xfrm
.policy_byidx
;
427 struct hlist_head
*nidx
= xfrm_hash_alloc(nsize
);
433 write_lock_bh(&xfrm_policy_lock
);
435 for (i
= hmask
; i
>= 0; i
--)
436 xfrm_idx_hash_transfer(oidx
+ i
, nidx
, nhashmask
);
438 net
->xfrm
.policy_byidx
= nidx
;
439 net
->xfrm
.policy_idx_hmask
= nhashmask
;
441 write_unlock_bh(&xfrm_policy_lock
);
443 xfrm_hash_free(oidx
, (hmask
+ 1) * sizeof(struct hlist_head
));
446 static inline int xfrm_bydst_should_resize(struct net
*net
, int dir
, int *total
)
448 unsigned int cnt
= net
->xfrm
.policy_count
[dir
];
449 unsigned int hmask
= net
->xfrm
.policy_bydst
[dir
].hmask
;
454 if ((hmask
+ 1) < xfrm_policy_hashmax
&&
461 static inline int xfrm_byidx_should_resize(struct net
*net
, int total
)
463 unsigned int hmask
= net
->xfrm
.policy_idx_hmask
;
465 if ((hmask
+ 1) < xfrm_policy_hashmax
&&
472 void xfrm_spd_getinfo(struct net
*net
, struct xfrmk_spdinfo
*si
)
474 read_lock_bh(&xfrm_policy_lock
);
475 si
->incnt
= net
->xfrm
.policy_count
[XFRM_POLICY_IN
];
476 si
->outcnt
= net
->xfrm
.policy_count
[XFRM_POLICY_OUT
];
477 si
->fwdcnt
= net
->xfrm
.policy_count
[XFRM_POLICY_FWD
];
478 si
->inscnt
= net
->xfrm
.policy_count
[XFRM_POLICY_IN
+XFRM_POLICY_MAX
];
479 si
->outscnt
= net
->xfrm
.policy_count
[XFRM_POLICY_OUT
+XFRM_POLICY_MAX
];
480 si
->fwdscnt
= net
->xfrm
.policy_count
[XFRM_POLICY_FWD
+XFRM_POLICY_MAX
];
481 si
->spdhcnt
= net
->xfrm
.policy_idx_hmask
;
482 si
->spdhmcnt
= xfrm_policy_hashmax
;
483 read_unlock_bh(&xfrm_policy_lock
);
485 EXPORT_SYMBOL(xfrm_spd_getinfo
);
487 static DEFINE_MUTEX(hash_resize_mutex
);
488 static void xfrm_hash_resize(struct work_struct
*work
)
490 struct net
*net
= container_of(work
, struct net
, xfrm
.policy_hash_work
);
493 mutex_lock(&hash_resize_mutex
);
496 for (dir
= 0; dir
< XFRM_POLICY_MAX
* 2; dir
++) {
497 if (xfrm_bydst_should_resize(net
, dir
, &total
))
498 xfrm_bydst_resize(net
, dir
);
500 if (xfrm_byidx_should_resize(net
, total
))
501 xfrm_byidx_resize(net
, total
);
503 mutex_unlock(&hash_resize_mutex
);
506 /* Generate new index... KAME seems to generate them ordered by cost
507 * of an absolute inpredictability of ordering of rules. This will not pass. */
508 static u32
xfrm_gen_index(struct net
*net
, int dir
)
510 static u32 idx_generator
;
513 struct hlist_node
*entry
;
514 struct hlist_head
*list
;
515 struct xfrm_policy
*p
;
519 idx
= (idx_generator
| dir
);
523 list
= net
->xfrm
.policy_byidx
+ idx_hash(net
, idx
);
525 hlist_for_each_entry(p
, entry
, list
, byidx
) {
526 if (p
->index
== idx
) {
536 static inline int selector_cmp(struct xfrm_selector
*s1
, struct xfrm_selector
*s2
)
538 u32
*p1
= (u32
*) s1
;
539 u32
*p2
= (u32
*) s2
;
540 int len
= sizeof(struct xfrm_selector
) / sizeof(u32
);
543 for (i
= 0; i
< len
; i
++) {
551 int xfrm_policy_insert(int dir
, struct xfrm_policy
*policy
, int excl
)
553 struct net
*net
= xp_net(policy
);
554 struct xfrm_policy
*pol
;
555 struct xfrm_policy
*delpol
;
556 struct hlist_head
*chain
;
557 struct hlist_node
*entry
, *newpos
;
558 struct dst_entry
*gc_list
;
560 write_lock_bh(&xfrm_policy_lock
);
561 chain
= policy_hash_bysel(net
, &policy
->selector
, policy
->family
, dir
);
564 hlist_for_each_entry(pol
, entry
, chain
, bydst
) {
565 if (pol
->type
== policy
->type
&&
566 !selector_cmp(&pol
->selector
, &policy
->selector
) &&
567 xfrm_sec_ctx_match(pol
->security
, policy
->security
) &&
570 write_unlock_bh(&xfrm_policy_lock
);
574 if (policy
->priority
> pol
->priority
)
576 } else if (policy
->priority
>= pol
->priority
) {
577 newpos
= &pol
->bydst
;
584 hlist_add_after(newpos
, &policy
->bydst
);
586 hlist_add_head(&policy
->bydst
, chain
);
587 xfrm_pol_hold(policy
);
588 net
->xfrm
.policy_count
[dir
]++;
589 atomic_inc(&flow_cache_genid
);
591 __xfrm_policy_unlink(delpol
, dir
);
592 policy
->index
= delpol
? delpol
->index
: xfrm_gen_index(net
, dir
);
593 hlist_add_head(&policy
->byidx
, net
->xfrm
.policy_byidx
+idx_hash(net
, policy
->index
));
594 policy
->curlft
.add_time
= get_seconds();
595 policy
->curlft
.use_time
= 0;
596 if (!mod_timer(&policy
->timer
, jiffies
+ HZ
))
597 xfrm_pol_hold(policy
);
598 list_add(&policy
->walk
.all
, &net
->xfrm
.policy_all
);
599 write_unlock_bh(&xfrm_policy_lock
);
602 xfrm_policy_kill(delpol
);
603 else if (xfrm_bydst_should_resize(net
, dir
, NULL
))
604 schedule_work(&net
->xfrm
.policy_hash_work
);
606 read_lock_bh(&xfrm_policy_lock
);
608 entry
= &policy
->bydst
;
609 hlist_for_each_entry_continue(policy
, entry
, bydst
) {
610 struct dst_entry
*dst
;
612 write_lock(&policy
->lock
);
613 dst
= policy
->bundles
;
615 struct dst_entry
*tail
= dst
;
618 tail
->next
= gc_list
;
621 policy
->bundles
= NULL
;
623 write_unlock(&policy
->lock
);
625 read_unlock_bh(&xfrm_policy_lock
);
628 struct dst_entry
*dst
= gc_list
;
636 EXPORT_SYMBOL(xfrm_policy_insert
);
638 struct xfrm_policy
*xfrm_policy_bysel_ctx(struct net
*net
, u32 mark
, u8 type
,
639 int dir
, struct xfrm_selector
*sel
,
640 struct xfrm_sec_ctx
*ctx
, int delete,
643 struct xfrm_policy
*pol
, *ret
;
644 struct hlist_head
*chain
;
645 struct hlist_node
*entry
;
648 write_lock_bh(&xfrm_policy_lock
);
649 chain
= policy_hash_bysel(net
, sel
, sel
->family
, dir
);
651 hlist_for_each_entry(pol
, entry
, chain
, bydst
) {
652 if (pol
->type
== type
&&
653 !selector_cmp(sel
, &pol
->selector
) &&
654 xfrm_sec_ctx_match(ctx
, pol
->security
)) {
657 *err
= security_xfrm_policy_delete(
660 write_unlock_bh(&xfrm_policy_lock
);
663 __xfrm_policy_unlink(pol
, dir
);
669 write_unlock_bh(&xfrm_policy_lock
);
672 atomic_inc(&flow_cache_genid
);
673 xfrm_policy_kill(ret
);
677 EXPORT_SYMBOL(xfrm_policy_bysel_ctx
);
679 struct xfrm_policy
*xfrm_policy_byid(struct net
*net
, u32 mark
, u8 type
,
680 int dir
, u32 id
, int delete, int *err
)
682 struct xfrm_policy
*pol
, *ret
;
683 struct hlist_head
*chain
;
684 struct hlist_node
*entry
;
687 if (xfrm_policy_id2dir(id
) != dir
)
691 write_lock_bh(&xfrm_policy_lock
);
692 chain
= net
->xfrm
.policy_byidx
+ idx_hash(net
, id
);
694 hlist_for_each_entry(pol
, entry
, chain
, byidx
) {
695 if (pol
->type
== type
&& pol
->index
== id
) {
698 *err
= security_xfrm_policy_delete(
701 write_unlock_bh(&xfrm_policy_lock
);
704 __xfrm_policy_unlink(pol
, dir
);
710 write_unlock_bh(&xfrm_policy_lock
);
713 atomic_inc(&flow_cache_genid
);
714 xfrm_policy_kill(ret
);
718 EXPORT_SYMBOL(xfrm_policy_byid
);
720 #ifdef CONFIG_SECURITY_NETWORK_XFRM
722 xfrm_policy_flush_secctx_check(struct net
*net
, u8 type
, struct xfrm_audit
*audit_info
)
726 for (dir
= 0; dir
< XFRM_POLICY_MAX
; dir
++) {
727 struct xfrm_policy
*pol
;
728 struct hlist_node
*entry
;
731 hlist_for_each_entry(pol
, entry
,
732 &net
->xfrm
.policy_inexact
[dir
], bydst
) {
733 if (pol
->type
!= type
)
735 err
= security_xfrm_policy_delete(pol
->security
);
737 xfrm_audit_policy_delete(pol
, 0,
738 audit_info
->loginuid
,
739 audit_info
->sessionid
,
744 for (i
= net
->xfrm
.policy_bydst
[dir
].hmask
; i
>= 0; i
--) {
745 hlist_for_each_entry(pol
, entry
,
746 net
->xfrm
.policy_bydst
[dir
].table
+ i
,
748 if (pol
->type
!= type
)
750 err
= security_xfrm_policy_delete(
753 xfrm_audit_policy_delete(pol
, 0,
754 audit_info
->loginuid
,
755 audit_info
->sessionid
,
766 xfrm_policy_flush_secctx_check(struct net
*net
, u8 type
, struct xfrm_audit
*audit_info
)
772 int xfrm_policy_flush(struct net
*net
, u8 type
, struct xfrm_audit
*audit_info
)
774 int dir
, err
= 0, cnt
= 0;
775 struct xfrm_policy
*dp
;
777 write_lock_bh(&xfrm_policy_lock
);
779 err
= xfrm_policy_flush_secctx_check(net
, type
, audit_info
);
783 for (dir
= 0; dir
< XFRM_POLICY_MAX
; dir
++) {
784 struct xfrm_policy
*pol
;
785 struct hlist_node
*entry
;
789 hlist_for_each_entry(pol
, entry
,
790 &net
->xfrm
.policy_inexact
[dir
], bydst
) {
791 if (pol
->type
!= type
)
793 dp
= __xfrm_policy_unlink(pol
, dir
);
794 write_unlock_bh(&xfrm_policy_lock
);
798 xfrm_audit_policy_delete(pol
, 1, audit_info
->loginuid
,
799 audit_info
->sessionid
,
802 xfrm_policy_kill(pol
);
804 write_lock_bh(&xfrm_policy_lock
);
808 for (i
= net
->xfrm
.policy_bydst
[dir
].hmask
; i
>= 0; i
--) {
810 hlist_for_each_entry(pol
, entry
,
811 net
->xfrm
.policy_bydst
[dir
].table
+ i
,
813 if (pol
->type
!= type
)
815 dp
= __xfrm_policy_unlink(pol
, dir
);
816 write_unlock_bh(&xfrm_policy_lock
);
820 xfrm_audit_policy_delete(pol
, 1,
821 audit_info
->loginuid
,
822 audit_info
->sessionid
,
824 xfrm_policy_kill(pol
);
826 write_lock_bh(&xfrm_policy_lock
);
834 atomic_inc(&flow_cache_genid
);
836 write_unlock_bh(&xfrm_policy_lock
);
839 EXPORT_SYMBOL(xfrm_policy_flush
);
841 int xfrm_policy_walk(struct net
*net
, struct xfrm_policy_walk
*walk
,
842 int (*func
)(struct xfrm_policy
*, int, int, void*),
845 struct xfrm_policy
*pol
;
846 struct xfrm_policy_walk_entry
*x
;
849 if (walk
->type
>= XFRM_POLICY_TYPE_MAX
&&
850 walk
->type
!= XFRM_POLICY_TYPE_ANY
)
853 if (list_empty(&walk
->walk
.all
) && walk
->seq
!= 0)
856 write_lock_bh(&xfrm_policy_lock
);
857 if (list_empty(&walk
->walk
.all
))
858 x
= list_first_entry(&net
->xfrm
.policy_all
, struct xfrm_policy_walk_entry
, all
);
860 x
= list_entry(&walk
->walk
.all
, struct xfrm_policy_walk_entry
, all
);
861 list_for_each_entry_from(x
, &net
->xfrm
.policy_all
, all
) {
864 pol
= container_of(x
, struct xfrm_policy
, walk
);
865 if (walk
->type
!= XFRM_POLICY_TYPE_ANY
&&
866 walk
->type
!= pol
->type
)
868 error
= func(pol
, xfrm_policy_id2dir(pol
->index
),
871 list_move_tail(&walk
->walk
.all
, &x
->all
);
876 if (walk
->seq
== 0) {
880 list_del_init(&walk
->walk
.all
);
882 write_unlock_bh(&xfrm_policy_lock
);
885 EXPORT_SYMBOL(xfrm_policy_walk
);
887 void xfrm_policy_walk_init(struct xfrm_policy_walk
*walk
, u8 type
)
889 INIT_LIST_HEAD(&walk
->walk
.all
);
894 EXPORT_SYMBOL(xfrm_policy_walk_init
);
896 void xfrm_policy_walk_done(struct xfrm_policy_walk
*walk
)
898 if (list_empty(&walk
->walk
.all
))
901 write_lock_bh(&xfrm_policy_lock
);
902 list_del(&walk
->walk
.all
);
903 write_unlock_bh(&xfrm_policy_lock
);
905 EXPORT_SYMBOL(xfrm_policy_walk_done
);
908 * Find policy to apply to this flow.
910 * Returns 0 if policy found, else an -errno.
912 static int xfrm_policy_match(struct xfrm_policy
*pol
, struct flowi
*fl
,
913 u8 type
, u16 family
, int dir
)
915 struct xfrm_selector
*sel
= &pol
->selector
;
916 int match
, ret
= -ESRCH
;
918 if (pol
->family
!= family
||
922 match
= xfrm_selector_match(sel
, fl
, family
);
924 ret
= security_xfrm_policy_lookup(pol
->security
, fl
->secid
,
930 static struct xfrm_policy
*xfrm_policy_lookup_bytype(struct net
*net
, u8 type
,
935 struct xfrm_policy
*pol
, *ret
;
936 xfrm_address_t
*daddr
, *saddr
;
937 struct hlist_node
*entry
;
938 struct hlist_head
*chain
;
941 daddr
= xfrm_flowi_daddr(fl
, family
);
942 saddr
= xfrm_flowi_saddr(fl
, family
);
943 if (unlikely(!daddr
|| !saddr
))
946 read_lock_bh(&xfrm_policy_lock
);
947 chain
= policy_hash_direct(net
, daddr
, saddr
, family
, dir
);
949 hlist_for_each_entry(pol
, entry
, chain
, bydst
) {
950 err
= xfrm_policy_match(pol
, fl
, type
, family
, dir
);
960 priority
= ret
->priority
;
964 chain
= &net
->xfrm
.policy_inexact
[dir
];
965 hlist_for_each_entry(pol
, entry
, chain
, bydst
) {
966 err
= xfrm_policy_match(pol
, fl
, type
, family
, dir
);
974 } else if (pol
->priority
< priority
) {
982 read_unlock_bh(&xfrm_policy_lock
);
987 static int xfrm_policy_lookup(struct net
*net
, struct flowi
*fl
, u16 family
,
988 u8 dir
, void **objp
, atomic_t
**obj_refp
)
990 struct xfrm_policy
*pol
;
993 #ifdef CONFIG_XFRM_SUB_POLICY
994 pol
= xfrm_policy_lookup_bytype(net
, XFRM_POLICY_TYPE_SUB
, fl
, family
, dir
);
1002 pol
= xfrm_policy_lookup_bytype(net
, XFRM_POLICY_TYPE_MAIN
, fl
, family
, dir
);
1007 #ifdef CONFIG_XFRM_SUB_POLICY
1010 if ((*objp
= (void *) pol
) != NULL
)
1011 *obj_refp
= &pol
->refcnt
;
1015 static inline int policy_to_flow_dir(int dir
)
1017 if (XFRM_POLICY_IN
== FLOW_DIR_IN
&&
1018 XFRM_POLICY_OUT
== FLOW_DIR_OUT
&&
1019 XFRM_POLICY_FWD
== FLOW_DIR_FWD
)
1023 case XFRM_POLICY_IN
:
1025 case XFRM_POLICY_OUT
:
1026 return FLOW_DIR_OUT
;
1027 case XFRM_POLICY_FWD
:
1028 return FLOW_DIR_FWD
;
1032 static struct xfrm_policy
*xfrm_sk_policy_lookup(struct sock
*sk
, int dir
, struct flowi
*fl
)
1034 struct xfrm_policy
*pol
;
1036 read_lock_bh(&xfrm_policy_lock
);
1037 if ((pol
= sk
->sk_policy
[dir
]) != NULL
) {
1038 int match
= xfrm_selector_match(&pol
->selector
, fl
,
1043 err
= security_xfrm_policy_lookup(pol
->security
,
1045 policy_to_flow_dir(dir
));
1048 else if (err
== -ESRCH
)
1055 read_unlock_bh(&xfrm_policy_lock
);
1059 static void __xfrm_policy_link(struct xfrm_policy
*pol
, int dir
)
1061 struct net
*net
= xp_net(pol
);
1062 struct hlist_head
*chain
= policy_hash_bysel(net
, &pol
->selector
,
1065 list_add(&pol
->walk
.all
, &net
->xfrm
.policy_all
);
1066 hlist_add_head(&pol
->bydst
, chain
);
1067 hlist_add_head(&pol
->byidx
, net
->xfrm
.policy_byidx
+idx_hash(net
, pol
->index
));
1068 net
->xfrm
.policy_count
[dir
]++;
1071 if (xfrm_bydst_should_resize(net
, dir
, NULL
))
1072 schedule_work(&net
->xfrm
.policy_hash_work
);
1075 static struct xfrm_policy
*__xfrm_policy_unlink(struct xfrm_policy
*pol
,
1078 struct net
*net
= xp_net(pol
);
1080 if (hlist_unhashed(&pol
->bydst
))
1083 hlist_del(&pol
->bydst
);
1084 hlist_del(&pol
->byidx
);
1085 list_del(&pol
->walk
.all
);
1086 net
->xfrm
.policy_count
[dir
]--;
1091 int xfrm_policy_delete(struct xfrm_policy
*pol
, int dir
)
1093 write_lock_bh(&xfrm_policy_lock
);
1094 pol
= __xfrm_policy_unlink(pol
, dir
);
1095 write_unlock_bh(&xfrm_policy_lock
);
1097 if (dir
< XFRM_POLICY_MAX
)
1098 atomic_inc(&flow_cache_genid
);
1099 xfrm_policy_kill(pol
);
1104 EXPORT_SYMBOL(xfrm_policy_delete
);
1106 int xfrm_sk_policy_insert(struct sock
*sk
, int dir
, struct xfrm_policy
*pol
)
1108 struct net
*net
= xp_net(pol
);
1109 struct xfrm_policy
*old_pol
;
1111 #ifdef CONFIG_XFRM_SUB_POLICY
1112 if (pol
&& pol
->type
!= XFRM_POLICY_TYPE_MAIN
)
1116 write_lock_bh(&xfrm_policy_lock
);
1117 old_pol
= sk
->sk_policy
[dir
];
1118 sk
->sk_policy
[dir
] = pol
;
1120 pol
->curlft
.add_time
= get_seconds();
1121 pol
->index
= xfrm_gen_index(net
, XFRM_POLICY_MAX
+dir
);
1122 __xfrm_policy_link(pol
, XFRM_POLICY_MAX
+dir
);
1125 __xfrm_policy_unlink(old_pol
, XFRM_POLICY_MAX
+dir
);
1126 write_unlock_bh(&xfrm_policy_lock
);
1129 xfrm_policy_kill(old_pol
);
1134 static struct xfrm_policy
*clone_policy(struct xfrm_policy
*old
, int dir
)
1136 struct xfrm_policy
*newp
= xfrm_policy_alloc(xp_net(old
), GFP_ATOMIC
);
1139 newp
->selector
= old
->selector
;
1140 if (security_xfrm_policy_clone(old
->security
,
1143 return NULL
; /* ENOMEM */
1145 newp
->lft
= old
->lft
;
1146 newp
->curlft
= old
->curlft
;
1147 newp
->action
= old
->action
;
1148 newp
->flags
= old
->flags
;
1149 newp
->xfrm_nr
= old
->xfrm_nr
;
1150 newp
->index
= old
->index
;
1151 newp
->type
= old
->type
;
1152 memcpy(newp
->xfrm_vec
, old
->xfrm_vec
,
1153 newp
->xfrm_nr
*sizeof(struct xfrm_tmpl
));
1154 write_lock_bh(&xfrm_policy_lock
);
1155 __xfrm_policy_link(newp
, XFRM_POLICY_MAX
+dir
);
1156 write_unlock_bh(&xfrm_policy_lock
);
1162 int __xfrm_sk_clone_policy(struct sock
*sk
)
1164 struct xfrm_policy
*p0
= sk
->sk_policy
[0],
1165 *p1
= sk
->sk_policy
[1];
1167 sk
->sk_policy
[0] = sk
->sk_policy
[1] = NULL
;
1168 if (p0
&& (sk
->sk_policy
[0] = clone_policy(p0
, 0)) == NULL
)
1170 if (p1
&& (sk
->sk_policy
[1] = clone_policy(p1
, 1)) == NULL
)
1176 xfrm_get_saddr(struct net
*net
, xfrm_address_t
*local
, xfrm_address_t
*remote
,
1177 unsigned short family
)
1180 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
1182 if (unlikely(afinfo
== NULL
))
1184 err
= afinfo
->get_saddr(net
, local
, remote
);
1185 xfrm_policy_put_afinfo(afinfo
);
1189 /* Resolve list of templates for the flow, given policy. */
1192 xfrm_tmpl_resolve_one(struct xfrm_policy
*policy
, struct flowi
*fl
,
1193 struct xfrm_state
**xfrm
,
1194 unsigned short family
)
1196 struct net
*net
= xp_net(policy
);
1199 xfrm_address_t
*daddr
= xfrm_flowi_daddr(fl
, family
);
1200 xfrm_address_t
*saddr
= xfrm_flowi_saddr(fl
, family
);
1203 for (nx
=0, i
= 0; i
< policy
->xfrm_nr
; i
++) {
1204 struct xfrm_state
*x
;
1205 xfrm_address_t
*remote
= daddr
;
1206 xfrm_address_t
*local
= saddr
;
1207 struct xfrm_tmpl
*tmpl
= &policy
->xfrm_vec
[i
];
1209 if (tmpl
->mode
== XFRM_MODE_TUNNEL
||
1210 tmpl
->mode
== XFRM_MODE_BEET
) {
1211 remote
= &tmpl
->id
.daddr
;
1212 local
= &tmpl
->saddr
;
1213 family
= tmpl
->encap_family
;
1214 if (xfrm_addr_any(local
, family
)) {
1215 error
= xfrm_get_saddr(net
, &tmp
, remote
, family
);
1222 x
= xfrm_state_find(remote
, local
, fl
, tmpl
, policy
, &error
, family
);
1224 if (x
&& x
->km
.state
== XFRM_STATE_VALID
) {
1231 error
= (x
->km
.state
== XFRM_STATE_ERROR
?
1235 else if (error
== -ESRCH
)
1238 if (!tmpl
->optional
)
1244 for (nx
--; nx
>=0; nx
--)
1245 xfrm_state_put(xfrm
[nx
]);
1250 xfrm_tmpl_resolve(struct xfrm_policy
**pols
, int npols
, struct flowi
*fl
,
1251 struct xfrm_state
**xfrm
,
1252 unsigned short family
)
1254 struct xfrm_state
*tp
[XFRM_MAX_DEPTH
];
1255 struct xfrm_state
**tpp
= (npols
> 1) ? tp
: xfrm
;
1261 for (i
= 0; i
< npols
; i
++) {
1262 if (cnx
+ pols
[i
]->xfrm_nr
>= XFRM_MAX_DEPTH
) {
1267 ret
= xfrm_tmpl_resolve_one(pols
[i
], fl
, &tpp
[cnx
], family
);
1275 /* found states are sorted for outbound processing */
1277 xfrm_state_sort(xfrm
, tpp
, cnx
, family
);
1282 for (cnx
--; cnx
>=0; cnx
--)
1283 xfrm_state_put(tpp
[cnx
]);
1288 /* Check that the bundle accepts the flow and its components are
1292 static struct dst_entry
*
1293 xfrm_find_bundle(struct flowi
*fl
, struct xfrm_policy
*policy
, unsigned short family
)
1295 struct dst_entry
*x
;
1296 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
1297 if (unlikely(afinfo
== NULL
))
1298 return ERR_PTR(-EINVAL
);
1299 x
= afinfo
->find_bundle(fl
, policy
);
1300 xfrm_policy_put_afinfo(afinfo
);
1304 static inline int xfrm_get_tos(struct flowi
*fl
, int family
)
1306 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
1312 tos
= afinfo
->get_tos(fl
);
1314 xfrm_policy_put_afinfo(afinfo
);
1319 static inline struct xfrm_dst
*xfrm_alloc_dst(struct net
*net
, int family
)
1321 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
1322 struct dst_ops
*dst_ops
;
1323 struct xfrm_dst
*xdst
;
1326 return ERR_PTR(-EINVAL
);
1330 dst_ops
= &net
->xfrm
.xfrm4_dst_ops
;
1332 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1334 dst_ops
= &net
->xfrm
.xfrm6_dst_ops
;
1340 xdst
= dst_alloc(dst_ops
) ?: ERR_PTR(-ENOBUFS
);
1342 xfrm_policy_put_afinfo(afinfo
);
1347 static inline int xfrm_init_path(struct xfrm_dst
*path
, struct dst_entry
*dst
,
1350 struct xfrm_policy_afinfo
*afinfo
=
1351 xfrm_policy_get_afinfo(dst
->ops
->family
);
1357 err
= afinfo
->init_path(path
, dst
, nfheader_len
);
1359 xfrm_policy_put_afinfo(afinfo
);
1364 static inline int xfrm_fill_dst(struct xfrm_dst
*xdst
, struct net_device
*dev
)
1366 struct xfrm_policy_afinfo
*afinfo
=
1367 xfrm_policy_get_afinfo(xdst
->u
.dst
.ops
->family
);
1373 err
= afinfo
->fill_dst(xdst
, dev
);
1375 xfrm_policy_put_afinfo(afinfo
);
1380 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1381 * all the metrics... Shortly, bundle a bundle.
1384 static struct dst_entry
*xfrm_bundle_create(struct xfrm_policy
*policy
,
1385 struct xfrm_state
**xfrm
, int nx
,
1387 struct dst_entry
*dst
)
1389 struct net
*net
= xp_net(policy
);
1390 unsigned long now
= jiffies
;
1391 struct net_device
*dev
;
1392 struct dst_entry
*dst_prev
= NULL
;
1393 struct dst_entry
*dst0
= NULL
;
1397 int nfheader_len
= 0;
1398 int trailer_len
= 0;
1400 int family
= policy
->selector
.family
;
1401 xfrm_address_t saddr
, daddr
;
1403 xfrm_flowi_addr_get(fl
, &saddr
, &daddr
, family
);
1405 tos
= xfrm_get_tos(fl
, family
);
1412 for (; i
< nx
; i
++) {
1413 struct xfrm_dst
*xdst
= xfrm_alloc_dst(net
, family
);
1414 struct dst_entry
*dst1
= &xdst
->u
.dst
;
1416 err
= PTR_ERR(xdst
);
1425 dst_prev
->child
= dst_clone(dst1
);
1426 dst1
->flags
|= DST_NOHASH
;
1430 memcpy(&dst1
->metrics
, &dst
->metrics
, sizeof(dst
->metrics
));
1432 if (xfrm
[i
]->props
.mode
!= XFRM_MODE_TRANSPORT
) {
1433 family
= xfrm
[i
]->props
.family
;
1434 dst
= xfrm_dst_lookup(xfrm
[i
], tos
, &saddr
, &daddr
,
1442 dst1
->xfrm
= xfrm
[i
];
1443 xdst
->genid
= xfrm
[i
]->genid
;
1445 dst1
->obsolete
= -1;
1446 dst1
->flags
|= DST_HOST
;
1447 dst1
->lastuse
= now
;
1449 dst1
->input
= dst_discard
;
1450 dst1
->output
= xfrm
[i
]->outer_mode
->afinfo
->output
;
1452 dst1
->next
= dst_prev
;
1455 header_len
+= xfrm
[i
]->props
.header_len
;
1456 if (xfrm
[i
]->type
->flags
& XFRM_TYPE_NON_FRAGMENT
)
1457 nfheader_len
+= xfrm
[i
]->props
.header_len
;
1458 trailer_len
+= xfrm
[i
]->props
.trailer_len
;
1461 dst_prev
->child
= dst
;
1469 /* Copy neighbour for reachability confirmation */
1470 dst0
->neighbour
= neigh_clone(dst
->neighbour
);
1472 xfrm_init_path((struct xfrm_dst
*)dst0
, dst
, nfheader_len
);
1473 xfrm_init_pmtu(dst_prev
);
1475 for (dst_prev
= dst0
; dst_prev
!= dst
; dst_prev
= dst_prev
->child
) {
1476 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst_prev
;
1478 err
= xfrm_fill_dst(xdst
, dev
);
1482 dst_prev
->header_len
= header_len
;
1483 dst_prev
->trailer_len
= trailer_len
;
1484 header_len
-= xdst
->u
.dst
.xfrm
->props
.header_len
;
1485 trailer_len
-= xdst
->u
.dst
.xfrm
->props
.trailer_len
;
1493 xfrm_state_put(xfrm
[i
]);
1497 dst0
= ERR_PTR(err
);
1502 xfrm_dst_alloc_copy(void **target
, void *src
, int size
)
1505 *target
= kmalloc(size
, GFP_ATOMIC
);
1509 memcpy(*target
, src
, size
);
1514 xfrm_dst_update_parent(struct dst_entry
*dst
, struct xfrm_selector
*sel
)
1516 #ifdef CONFIG_XFRM_SUB_POLICY
1517 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
1518 return xfrm_dst_alloc_copy((void **)&(xdst
->partner
),
1526 xfrm_dst_update_origin(struct dst_entry
*dst
, struct flowi
*fl
)
1528 #ifdef CONFIG_XFRM_SUB_POLICY
1529 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
1530 return xfrm_dst_alloc_copy((void **)&(xdst
->origin
), fl
, sizeof(*fl
));
1536 static int stale_bundle(struct dst_entry
*dst
);
1538 /* Main function: finds/creates a bundle for given flow.
1540 * At the moment we eat a raw IP route. Mostly to speed up lookups
1541 * on interfaces with disabled IPsec.
1543 int __xfrm_lookup(struct net
*net
, struct dst_entry
**dst_p
, struct flowi
*fl
,
1544 struct sock
*sk
, int flags
)
1546 struct xfrm_policy
*policy
;
1547 struct xfrm_policy
*pols
[XFRM_POLICY_TYPE_MAX
];
1552 struct xfrm_state
*xfrm
[XFRM_MAX_DEPTH
];
1553 struct dst_entry
*dst
, *dst_orig
= *dst_p
;
1558 u8 dir
= policy_to_flow_dir(XFRM_POLICY_OUT
);
1561 genid
= atomic_read(&flow_cache_genid
);
1563 for (pi
= 0; pi
< ARRAY_SIZE(pols
); pi
++)
1569 if (sk
&& sk
->sk_policy
[XFRM_POLICY_OUT
]) {
1570 policy
= xfrm_sk_policy_lookup(sk
, XFRM_POLICY_OUT
, fl
);
1571 err
= PTR_ERR(policy
);
1572 if (IS_ERR(policy
)) {
1573 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTPOLERROR
);
1579 /* To accelerate a bit... */
1580 if ((dst_orig
->flags
& DST_NOXFRM
) ||
1581 !net
->xfrm
.policy_count
[XFRM_POLICY_OUT
])
1584 policy
= flow_cache_lookup(net
, fl
, dst_orig
->ops
->family
,
1585 dir
, xfrm_policy_lookup
);
1586 err
= PTR_ERR(policy
);
1587 if (IS_ERR(policy
)) {
1588 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTPOLERROR
);
1596 family
= dst_orig
->ops
->family
;
1599 xfrm_nr
+= pols
[0]->xfrm_nr
;
1602 if ((flags
& XFRM_LOOKUP_ICMP
) && !(policy
->flags
& XFRM_POLICY_ICMP
))
1605 policy
->curlft
.use_time
= get_seconds();
1607 switch (policy
->action
) {
1609 case XFRM_POLICY_BLOCK
:
1610 /* Prohibit the flow */
1611 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTPOLBLOCK
);
1615 case XFRM_POLICY_ALLOW
:
1616 #ifndef CONFIG_XFRM_SUB_POLICY
1617 if (policy
->xfrm_nr
== 0) {
1618 /* Flow passes not transformed. */
1619 xfrm_pol_put(policy
);
1624 /* Try to find matching bundle.
1626 * LATER: help from flow cache. It is optional, this
1627 * is required only for output policy.
1629 dst
= xfrm_find_bundle(fl
, policy
, family
);
1631 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTBUNDLECHECKERROR
);
1639 #ifdef CONFIG_XFRM_SUB_POLICY
1640 if (pols
[0]->type
!= XFRM_POLICY_TYPE_MAIN
) {
1641 pols
[1] = xfrm_policy_lookup_bytype(net
,
1642 XFRM_POLICY_TYPE_MAIN
,
1646 if (IS_ERR(pols
[1])) {
1647 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTPOLERROR
);
1648 err
= PTR_ERR(pols
[1]);
1651 if (pols
[1]->action
== XFRM_POLICY_BLOCK
) {
1652 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTPOLBLOCK
);
1657 xfrm_nr
+= pols
[1]->xfrm_nr
;
1662 * Because neither flowi nor bundle information knows about
1663 * transformation template size. On more than one policy usage
1664 * we can realize whether all of them is bypass or not after
1665 * they are searched. See above not-transformed bypass
1666 * is surrounded by non-sub policy configuration, too.
1669 /* Flow passes not transformed. */
1670 xfrm_pols_put(pols
, npols
);
1675 nx
= xfrm_tmpl_resolve(pols
, npols
, fl
, xfrm
, family
);
1677 if (unlikely(nx
<0)) {
1679 if (err
== -EAGAIN
&& net
->xfrm
.sysctl_larval_drop
) {
1680 /* EREMOTE tells the caller to generate
1681 * a one-shot blackhole route.
1683 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTNOSTATES
);
1684 xfrm_pol_put(policy
);
1687 if (err
== -EAGAIN
&& (flags
& XFRM_LOOKUP_WAIT
)) {
1688 DECLARE_WAITQUEUE(wait
, current
);
1690 add_wait_queue(&net
->xfrm
.km_waitq
, &wait
);
1691 set_current_state(TASK_INTERRUPTIBLE
);
1693 set_current_state(TASK_RUNNING
);
1694 remove_wait_queue(&net
->xfrm
.km_waitq
, &wait
);
1696 nx
= xfrm_tmpl_resolve(pols
, npols
, fl
, xfrm
, family
);
1698 if (nx
== -EAGAIN
&& signal_pending(current
)) {
1699 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTNOSTATES
);
1703 if (nx
== -EAGAIN
||
1704 genid
!= atomic_read(&flow_cache_genid
)) {
1705 xfrm_pols_put(pols
, npols
);
1711 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTNOSTATES
);
1716 /* Flow passes not transformed. */
1717 xfrm_pols_put(pols
, npols
);
1721 dst
= xfrm_bundle_create(policy
, xfrm
, nx
, fl
, dst_orig
);
1724 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTBUNDLEGENERROR
);
1728 for (pi
= 0; pi
< npols
; pi
++) {
1729 read_lock_bh(&pols
[pi
]->lock
);
1730 pol_dead
|= pols
[pi
]->walk
.dead
;
1731 read_unlock_bh(&pols
[pi
]->lock
);
1734 write_lock_bh(&policy
->lock
);
1735 if (unlikely(pol_dead
|| stale_bundle(dst
))) {
1736 /* Wow! While we worked on resolving, this
1737 * policy has gone. Retry. It is not paranoia,
1738 * we just cannot enlist new bundle to dead object.
1739 * We can't enlist stable bundles either.
1741 write_unlock_bh(&policy
->lock
);
1745 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTPOLDEAD
);
1747 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTBUNDLECHECKERROR
);
1748 err
= -EHOSTUNREACH
;
1753 err
= xfrm_dst_update_parent(dst
, &pols
[1]->selector
);
1755 err
= xfrm_dst_update_origin(dst
, fl
);
1756 if (unlikely(err
)) {
1757 write_unlock_bh(&policy
->lock
);
1759 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTBUNDLECHECKERROR
);
1763 dst
->next
= policy
->bundles
;
1764 policy
->bundles
= dst
;
1766 write_unlock_bh(&policy
->lock
);
1769 dst_release(dst_orig
);
1770 xfrm_pols_put(pols
, npols
);
1774 xfrm_pols_put(pols
, npols
);
1776 dst_release(dst_orig
);
1782 if (flags
& XFRM_LOOKUP_ICMP
)
1786 EXPORT_SYMBOL(__xfrm_lookup
);
1788 int xfrm_lookup(struct net
*net
, struct dst_entry
**dst_p
, struct flowi
*fl
,
1789 struct sock
*sk
, int flags
)
1791 int err
= __xfrm_lookup(net
, dst_p
, fl
, sk
, flags
);
1793 if (err
== -EREMOTE
) {
1794 dst_release(*dst_p
);
1801 EXPORT_SYMBOL(xfrm_lookup
);
1804 xfrm_secpath_reject(int idx
, struct sk_buff
*skb
, struct flowi
*fl
)
1806 struct xfrm_state
*x
;
1808 if (!skb
->sp
|| idx
< 0 || idx
>= skb
->sp
->len
)
1810 x
= skb
->sp
->xvec
[idx
];
1811 if (!x
->type
->reject
)
1813 return x
->type
->reject(x
, skb
, fl
);
1816 /* When skb is transformed back to its "native" form, we have to
1817 * check policy restrictions. At the moment we make this in maximally
1818 * stupid way. Shame on me. :-) Of course, connected sockets must
1819 * have policy cached at them.
1823 xfrm_state_ok(struct xfrm_tmpl
*tmpl
, struct xfrm_state
*x
,
1824 unsigned short family
)
1826 if (xfrm_state_kern(x
))
1827 return tmpl
->optional
&& !xfrm_state_addr_cmp(tmpl
, x
, tmpl
->encap_family
);
1828 return x
->id
.proto
== tmpl
->id
.proto
&&
1829 (x
->id
.spi
== tmpl
->id
.spi
|| !tmpl
->id
.spi
) &&
1830 (x
->props
.reqid
== tmpl
->reqid
|| !tmpl
->reqid
) &&
1831 x
->props
.mode
== tmpl
->mode
&&
1832 (tmpl
->allalgs
|| (tmpl
->aalgos
& (1<<x
->props
.aalgo
)) ||
1833 !(xfrm_id_proto_match(tmpl
->id
.proto
, IPSEC_PROTO_ANY
))) &&
1834 !(x
->props
.mode
!= XFRM_MODE_TRANSPORT
&&
1835 xfrm_state_addr_cmp(tmpl
, x
, family
));
1839 * 0 or more than 0 is returned when validation is succeeded (either bypass
1840 * because of optional transport mode, or next index of the mathced secpath
1841 * state with the template.
1842 * -1 is returned when no matching template is found.
1843 * Otherwise "-2 - errored_index" is returned.
1846 xfrm_policy_ok(struct xfrm_tmpl
*tmpl
, struct sec_path
*sp
, int start
,
1847 unsigned short family
)
1851 if (tmpl
->optional
) {
1852 if (tmpl
->mode
== XFRM_MODE_TRANSPORT
)
1856 for (; idx
< sp
->len
; idx
++) {
1857 if (xfrm_state_ok(tmpl
, sp
->xvec
[idx
], family
))
1859 if (sp
->xvec
[idx
]->props
.mode
!= XFRM_MODE_TRANSPORT
) {
1868 int __xfrm_decode_session(struct sk_buff
*skb
, struct flowi
*fl
,
1869 unsigned int family
, int reverse
)
1871 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
1874 if (unlikely(afinfo
== NULL
))
1875 return -EAFNOSUPPORT
;
1877 afinfo
->decode_session(skb
, fl
, reverse
);
1878 err
= security_xfrm_decode_session(skb
, &fl
->secid
);
1879 xfrm_policy_put_afinfo(afinfo
);
1882 EXPORT_SYMBOL(__xfrm_decode_session
);
1884 static inline int secpath_has_nontransport(struct sec_path
*sp
, int k
, int *idxp
)
1886 for (; k
< sp
->len
; k
++) {
1887 if (sp
->xvec
[k
]->props
.mode
!= XFRM_MODE_TRANSPORT
) {
1896 int __xfrm_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
,
1897 unsigned short family
)
1899 struct net
*net
= dev_net(skb
->dev
);
1900 struct xfrm_policy
*pol
;
1901 struct xfrm_policy
*pols
[XFRM_POLICY_TYPE_MAX
];
1910 reverse
= dir
& ~XFRM_POLICY_MASK
;
1911 dir
&= XFRM_POLICY_MASK
;
1912 fl_dir
= policy_to_flow_dir(dir
);
1914 if (__xfrm_decode_session(skb
, &fl
, family
, reverse
) < 0) {
1915 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINHDRERROR
);
1919 nf_nat_decode_session(skb
, &fl
, family
);
1921 /* First, check used SA against their selectors. */
1925 for (i
=skb
->sp
->len
-1; i
>=0; i
--) {
1926 struct xfrm_state
*x
= skb
->sp
->xvec
[i
];
1927 if (!xfrm_selector_match(&x
->sel
, &fl
, family
)) {
1928 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINSTATEMISMATCH
);
1935 if (sk
&& sk
->sk_policy
[dir
]) {
1936 pol
= xfrm_sk_policy_lookup(sk
, dir
, &fl
);
1938 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINPOLERROR
);
1944 pol
= flow_cache_lookup(net
, &fl
, family
, fl_dir
,
1945 xfrm_policy_lookup
);
1948 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINPOLERROR
);
1953 if (skb
->sp
&& secpath_has_nontransport(skb
->sp
, 0, &xerr_idx
)) {
1954 xfrm_secpath_reject(xerr_idx
, skb
, &fl
);
1955 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINNOPOLS
);
1961 pol
->curlft
.use_time
= get_seconds();
1965 #ifdef CONFIG_XFRM_SUB_POLICY
1966 if (pols
[0]->type
!= XFRM_POLICY_TYPE_MAIN
) {
1967 pols
[1] = xfrm_policy_lookup_bytype(net
, XFRM_POLICY_TYPE_MAIN
,
1971 if (IS_ERR(pols
[1])) {
1972 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINPOLERROR
);
1975 pols
[1]->curlft
.use_time
= get_seconds();
1981 if (pol
->action
== XFRM_POLICY_ALLOW
) {
1982 struct sec_path
*sp
;
1983 static struct sec_path dummy
;
1984 struct xfrm_tmpl
*tp
[XFRM_MAX_DEPTH
];
1985 struct xfrm_tmpl
*stp
[XFRM_MAX_DEPTH
];
1986 struct xfrm_tmpl
**tpp
= tp
;
1990 if ((sp
= skb
->sp
) == NULL
)
1993 for (pi
= 0; pi
< npols
; pi
++) {
1994 if (pols
[pi
] != pol
&&
1995 pols
[pi
]->action
!= XFRM_POLICY_ALLOW
) {
1996 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINPOLBLOCK
);
1999 if (ti
+ pols
[pi
]->xfrm_nr
>= XFRM_MAX_DEPTH
) {
2000 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINBUFFERERROR
);
2003 for (i
= 0; i
< pols
[pi
]->xfrm_nr
; i
++)
2004 tpp
[ti
++] = &pols
[pi
]->xfrm_vec
[i
];
2008 xfrm_tmpl_sort(stp
, tpp
, xfrm_nr
, family
);
2012 /* For each tunnel xfrm, find the first matching tmpl.
2013 * For each tmpl before that, find corresponding xfrm.
2014 * Order is _important_. Later we will implement
2015 * some barriers, but at the moment barriers
2016 * are implied between each two transformations.
2018 for (i
= xfrm_nr
-1, k
= 0; i
>= 0; i
--) {
2019 k
= xfrm_policy_ok(tpp
[i
], sp
, k
, family
);
2022 /* "-2 - errored_index" returned */
2024 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINTMPLMISMATCH
);
2029 if (secpath_has_nontransport(sp
, k
, &xerr_idx
)) {
2030 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINTMPLMISMATCH
);
2034 xfrm_pols_put(pols
, npols
);
2037 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINPOLBLOCK
);
2040 xfrm_secpath_reject(xerr_idx
, skb
, &fl
);
2042 xfrm_pols_put(pols
, npols
);
2045 EXPORT_SYMBOL(__xfrm_policy_check
);
2047 int __xfrm_route_forward(struct sk_buff
*skb
, unsigned short family
)
2049 struct net
*net
= dev_net(skb
->dev
);
2051 struct dst_entry
*dst
;
2054 if (xfrm_decode_session(skb
, &fl
, family
) < 0) {
2055 XFRM_INC_STATS(net
, LINUX_MIB_XFRMFWDHDRERROR
);
2061 res
= xfrm_lookup(net
, &dst
, &fl
, NULL
, 0) == 0;
2062 skb_dst_set(skb
, dst
);
2065 EXPORT_SYMBOL(__xfrm_route_forward
);
2067 /* Optimize later using cookies and generation ids. */
2069 static struct dst_entry
*xfrm_dst_check(struct dst_entry
*dst
, u32 cookie
)
2071 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2072 * to "-1" to force all XFRM destinations to get validated by
2073 * dst_ops->check on every use. We do this because when a
2074 * normal route referenced by an XFRM dst is obsoleted we do
2075 * not go looking around for all parent referencing XFRM dsts
2076 * so that we can invalidate them. It is just too much work.
2077 * Instead we make the checks here on every use. For example:
2079 * XFRM dst A --> IPv4 dst X
2081 * X is the "xdst->route" of A (X is also the "dst->path" of A
2082 * in this example). If X is marked obsolete, "A" will not
2083 * notice. That's what we are validating here via the
2084 * stale_bundle() check.
2086 * When a policy's bundle is pruned, we dst_free() the XFRM
2087 * dst which causes it's ->obsolete field to be set to a
2088 * positive non-zero integer. If an XFRM dst has been pruned
2089 * like this, we want to force a new route lookup.
2091 if (dst
->obsolete
< 0 && !stale_bundle(dst
))
2097 static int stale_bundle(struct dst_entry
*dst
)
2099 return !xfrm_bundle_ok(NULL
, (struct xfrm_dst
*)dst
, NULL
, AF_UNSPEC
, 0);
2102 void xfrm_dst_ifdown(struct dst_entry
*dst
, struct net_device
*dev
)
2104 while ((dst
= dst
->child
) && dst
->xfrm
&& dst
->dev
== dev
) {
2105 dst
->dev
= dev_net(dev
)->loopback_dev
;
2110 EXPORT_SYMBOL(xfrm_dst_ifdown
);
2112 static void xfrm_link_failure(struct sk_buff
*skb
)
2114 /* Impossible. Such dst must be popped before reaches point of failure. */
2118 static struct dst_entry
*xfrm_negative_advice(struct dst_entry
*dst
)
2121 if (dst
->obsolete
) {
2129 static void prune_one_bundle(struct xfrm_policy
*pol
, int (*func
)(struct dst_entry
*), struct dst_entry
**gc_list_p
)
2131 struct dst_entry
*dst
, **dstp
;
2133 write_lock(&pol
->lock
);
2134 dstp
= &pol
->bundles
;
2135 while ((dst
=*dstp
) != NULL
) {
2138 dst
->next
= *gc_list_p
;
2144 write_unlock(&pol
->lock
);
2147 static void xfrm_prune_bundles(struct net
*net
, int (*func
)(struct dst_entry
*))
2149 struct dst_entry
*gc_list
= NULL
;
2152 read_lock_bh(&xfrm_policy_lock
);
2153 for (dir
= 0; dir
< XFRM_POLICY_MAX
* 2; dir
++) {
2154 struct xfrm_policy
*pol
;
2155 struct hlist_node
*entry
;
2156 struct hlist_head
*table
;
2159 hlist_for_each_entry(pol
, entry
,
2160 &net
->xfrm
.policy_inexact
[dir
], bydst
)
2161 prune_one_bundle(pol
, func
, &gc_list
);
2163 table
= net
->xfrm
.policy_bydst
[dir
].table
;
2164 for (i
= net
->xfrm
.policy_bydst
[dir
].hmask
; i
>= 0; i
--) {
2165 hlist_for_each_entry(pol
, entry
, table
+ i
, bydst
)
2166 prune_one_bundle(pol
, func
, &gc_list
);
2169 read_unlock_bh(&xfrm_policy_lock
);
2172 struct dst_entry
*dst
= gc_list
;
2173 gc_list
= dst
->next
;
2178 static int unused_bundle(struct dst_entry
*dst
)
2180 return !atomic_read(&dst
->__refcnt
);
2183 static void __xfrm_garbage_collect(struct net
*net
)
2185 xfrm_prune_bundles(net
, unused_bundle
);
2188 static int xfrm_flush_bundles(struct net
*net
)
2190 xfrm_prune_bundles(net
, stale_bundle
);
2194 static void xfrm_init_pmtu(struct dst_entry
*dst
)
2197 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
2198 u32 pmtu
, route_mtu_cached
;
2200 pmtu
= dst_mtu(dst
->child
);
2201 xdst
->child_mtu_cached
= pmtu
;
2203 pmtu
= xfrm_state_mtu(dst
->xfrm
, pmtu
);
2205 route_mtu_cached
= dst_mtu(xdst
->route
);
2206 xdst
->route_mtu_cached
= route_mtu_cached
;
2208 if (pmtu
> route_mtu_cached
)
2209 pmtu
= route_mtu_cached
;
2211 dst
->metrics
[RTAX_MTU
-1] = pmtu
;
2212 } while ((dst
= dst
->next
));
2215 /* Check that the bundle accepts the flow and its components are
2219 int xfrm_bundle_ok(struct xfrm_policy
*pol
, struct xfrm_dst
*first
,
2220 struct flowi
*fl
, int family
, int strict
)
2222 struct dst_entry
*dst
= &first
->u
.dst
;
2223 struct xfrm_dst
*last
;
2226 if (!dst_check(dst
->path
, ((struct xfrm_dst
*)dst
)->path_cookie
) ||
2227 (dst
->dev
&& !netif_running(dst
->dev
)))
2229 #ifdef CONFIG_XFRM_SUB_POLICY
2231 if (first
->origin
&& !flow_cache_uli_match(first
->origin
, fl
))
2233 if (first
->partner
&&
2234 !xfrm_selector_match(first
->partner
, fl
, family
))
2242 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
2244 if (fl
&& !xfrm_selector_match(&dst
->xfrm
->sel
, fl
, family
))
2247 !security_xfrm_state_pol_flow_match(dst
->xfrm
, pol
, fl
))
2249 if (dst
->xfrm
->km
.state
!= XFRM_STATE_VALID
)
2251 if (xdst
->genid
!= dst
->xfrm
->genid
)
2255 !(dst
->xfrm
->outer_mode
->flags
& XFRM_MODE_FLAG_TUNNEL
) &&
2256 !xfrm_state_addr_flow_check(dst
->xfrm
, fl
, family
))
2259 mtu
= dst_mtu(dst
->child
);
2260 if (xdst
->child_mtu_cached
!= mtu
) {
2262 xdst
->child_mtu_cached
= mtu
;
2265 if (!dst_check(xdst
->route
, xdst
->route_cookie
))
2267 mtu
= dst_mtu(xdst
->route
);
2268 if (xdst
->route_mtu_cached
!= mtu
) {
2270 xdst
->route_mtu_cached
= mtu
;
2274 } while (dst
->xfrm
);
2279 mtu
= last
->child_mtu_cached
;
2283 mtu
= xfrm_state_mtu(dst
->xfrm
, mtu
);
2284 if (mtu
> last
->route_mtu_cached
)
2285 mtu
= last
->route_mtu_cached
;
2286 dst
->metrics
[RTAX_MTU
-1] = mtu
;
2291 last
= (struct xfrm_dst
*)last
->u
.dst
.next
;
2292 last
->child_mtu_cached
= mtu
;
2298 EXPORT_SYMBOL(xfrm_bundle_ok
);
2300 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo
*afinfo
)
2304 if (unlikely(afinfo
== NULL
))
2306 if (unlikely(afinfo
->family
>= NPROTO
))
2307 return -EAFNOSUPPORT
;
2308 write_lock_bh(&xfrm_policy_afinfo_lock
);
2309 if (unlikely(xfrm_policy_afinfo
[afinfo
->family
] != NULL
))
2312 struct dst_ops
*dst_ops
= afinfo
->dst_ops
;
2313 if (likely(dst_ops
->kmem_cachep
== NULL
))
2314 dst_ops
->kmem_cachep
= xfrm_dst_cache
;
2315 if (likely(dst_ops
->check
== NULL
))
2316 dst_ops
->check
= xfrm_dst_check
;
2317 if (likely(dst_ops
->negative_advice
== NULL
))
2318 dst_ops
->negative_advice
= xfrm_negative_advice
;
2319 if (likely(dst_ops
->link_failure
== NULL
))
2320 dst_ops
->link_failure
= xfrm_link_failure
;
2321 if (likely(afinfo
->garbage_collect
== NULL
))
2322 afinfo
->garbage_collect
= __xfrm_garbage_collect
;
2323 xfrm_policy_afinfo
[afinfo
->family
] = afinfo
;
2325 write_unlock_bh(&xfrm_policy_afinfo_lock
);
2329 struct dst_ops
*xfrm_dst_ops
;
2331 switch (afinfo
->family
) {
2333 xfrm_dst_ops
= &net
->xfrm
.xfrm4_dst_ops
;
2335 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2337 xfrm_dst_ops
= &net
->xfrm
.xfrm6_dst_ops
;
2343 *xfrm_dst_ops
= *afinfo
->dst_ops
;
2349 EXPORT_SYMBOL(xfrm_policy_register_afinfo
);
2351 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo
*afinfo
)
2354 if (unlikely(afinfo
== NULL
))
2356 if (unlikely(afinfo
->family
>= NPROTO
))
2357 return -EAFNOSUPPORT
;
2358 write_lock_bh(&xfrm_policy_afinfo_lock
);
2359 if (likely(xfrm_policy_afinfo
[afinfo
->family
] != NULL
)) {
2360 if (unlikely(xfrm_policy_afinfo
[afinfo
->family
] != afinfo
))
2363 struct dst_ops
*dst_ops
= afinfo
->dst_ops
;
2364 xfrm_policy_afinfo
[afinfo
->family
] = NULL
;
2365 dst_ops
->kmem_cachep
= NULL
;
2366 dst_ops
->check
= NULL
;
2367 dst_ops
->negative_advice
= NULL
;
2368 dst_ops
->link_failure
= NULL
;
2369 afinfo
->garbage_collect
= NULL
;
2372 write_unlock_bh(&xfrm_policy_afinfo_lock
);
2375 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo
);
2377 static void __net_init
xfrm_dst_ops_init(struct net
*net
)
2379 struct xfrm_policy_afinfo
*afinfo
;
2381 read_lock_bh(&xfrm_policy_afinfo_lock
);
2382 afinfo
= xfrm_policy_afinfo
[AF_INET
];
2384 net
->xfrm
.xfrm4_dst_ops
= *afinfo
->dst_ops
;
2385 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2386 afinfo
= xfrm_policy_afinfo
[AF_INET6
];
2388 net
->xfrm
.xfrm6_dst_ops
= *afinfo
->dst_ops
;
2390 read_unlock_bh(&xfrm_policy_afinfo_lock
);
2393 static struct xfrm_policy_afinfo
*xfrm_policy_get_afinfo(unsigned short family
)
2395 struct xfrm_policy_afinfo
*afinfo
;
2396 if (unlikely(family
>= NPROTO
))
2398 read_lock(&xfrm_policy_afinfo_lock
);
2399 afinfo
= xfrm_policy_afinfo
[family
];
2400 if (unlikely(!afinfo
))
2401 read_unlock(&xfrm_policy_afinfo_lock
);
2405 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo
*afinfo
)
2407 read_unlock(&xfrm_policy_afinfo_lock
);
2410 static int xfrm_dev_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
2412 struct net_device
*dev
= ptr
;
2416 xfrm_flush_bundles(dev_net(dev
));
2421 static struct notifier_block xfrm_dev_notifier
= {
2422 .notifier_call
= xfrm_dev_event
,
2425 #ifdef CONFIG_XFRM_STATISTICS
2426 static int __net_init
xfrm_statistics_init(struct net
*net
)
2430 if (snmp_mib_init((void __percpu
**)net
->mib
.xfrm_statistics
,
2431 sizeof(struct linux_xfrm_mib
)) < 0)
2433 rv
= xfrm_proc_init(net
);
2435 snmp_mib_free((void __percpu
**)net
->mib
.xfrm_statistics
);
2439 static void xfrm_statistics_fini(struct net
*net
)
2441 xfrm_proc_fini(net
);
2442 snmp_mib_free((void __percpu
**)net
->mib
.xfrm_statistics
);
2445 static int __net_init
xfrm_statistics_init(struct net
*net
)
2450 static void xfrm_statistics_fini(struct net
*net
)
2455 static int __net_init
xfrm_policy_init(struct net
*net
)
2457 unsigned int hmask
, sz
;
2460 if (net_eq(net
, &init_net
))
2461 xfrm_dst_cache
= kmem_cache_create("xfrm_dst_cache",
2462 sizeof(struct xfrm_dst
),
2463 0, SLAB_HWCACHE_ALIGN
|SLAB_PANIC
,
2467 sz
= (hmask
+1) * sizeof(struct hlist_head
);
2469 net
->xfrm
.policy_byidx
= xfrm_hash_alloc(sz
);
2470 if (!net
->xfrm
.policy_byidx
)
2472 net
->xfrm
.policy_idx_hmask
= hmask
;
2474 for (dir
= 0; dir
< XFRM_POLICY_MAX
* 2; dir
++) {
2475 struct xfrm_policy_hash
*htab
;
2477 net
->xfrm
.policy_count
[dir
] = 0;
2478 INIT_HLIST_HEAD(&net
->xfrm
.policy_inexact
[dir
]);
2480 htab
= &net
->xfrm
.policy_bydst
[dir
];
2481 htab
->table
= xfrm_hash_alloc(sz
);
2484 htab
->hmask
= hmask
;
2487 INIT_LIST_HEAD(&net
->xfrm
.policy_all
);
2488 INIT_WORK(&net
->xfrm
.policy_hash_work
, xfrm_hash_resize
);
2489 if (net_eq(net
, &init_net
))
2490 register_netdevice_notifier(&xfrm_dev_notifier
);
2494 for (dir
--; dir
>= 0; dir
--) {
2495 struct xfrm_policy_hash
*htab
;
2497 htab
= &net
->xfrm
.policy_bydst
[dir
];
2498 xfrm_hash_free(htab
->table
, sz
);
2500 xfrm_hash_free(net
->xfrm
.policy_byidx
, sz
);
2505 static void xfrm_policy_fini(struct net
*net
)
2507 struct xfrm_audit audit_info
;
2511 flush_work(&net
->xfrm
.policy_hash_work
);
2512 #ifdef CONFIG_XFRM_SUB_POLICY
2513 audit_info
.loginuid
= -1;
2514 audit_info
.sessionid
= -1;
2515 audit_info
.secid
= 0;
2516 xfrm_policy_flush(net
, XFRM_POLICY_TYPE_SUB
, &audit_info
);
2518 audit_info
.loginuid
= -1;
2519 audit_info
.sessionid
= -1;
2520 audit_info
.secid
= 0;
2521 xfrm_policy_flush(net
, XFRM_POLICY_TYPE_MAIN
, &audit_info
);
2522 flush_work(&xfrm_policy_gc_work
);
2524 WARN_ON(!list_empty(&net
->xfrm
.policy_all
));
2526 for (dir
= 0; dir
< XFRM_POLICY_MAX
* 2; dir
++) {
2527 struct xfrm_policy_hash
*htab
;
2529 WARN_ON(!hlist_empty(&net
->xfrm
.policy_inexact
[dir
]));
2531 htab
= &net
->xfrm
.policy_bydst
[dir
];
2532 sz
= (htab
->hmask
+ 1);
2533 WARN_ON(!hlist_empty(htab
->table
));
2534 xfrm_hash_free(htab
->table
, sz
);
2537 sz
= (net
->xfrm
.policy_idx_hmask
+ 1) * sizeof(struct hlist_head
);
2538 WARN_ON(!hlist_empty(net
->xfrm
.policy_byidx
));
2539 xfrm_hash_free(net
->xfrm
.policy_byidx
, sz
);
2542 static int __net_init
xfrm_net_init(struct net
*net
)
2546 rv
= xfrm_statistics_init(net
);
2548 goto out_statistics
;
2549 rv
= xfrm_state_init(net
);
2552 rv
= xfrm_policy_init(net
);
2555 xfrm_dst_ops_init(net
);
2556 rv
= xfrm_sysctl_init(net
);
2562 xfrm_policy_fini(net
);
2564 xfrm_state_fini(net
);
2566 xfrm_statistics_fini(net
);
2571 static void __net_exit
xfrm_net_exit(struct net
*net
)
2573 xfrm_sysctl_fini(net
);
2574 xfrm_policy_fini(net
);
2575 xfrm_state_fini(net
);
2576 xfrm_statistics_fini(net
);
2579 static struct pernet_operations __net_initdata xfrm_net_ops
= {
2580 .init
= xfrm_net_init
,
2581 .exit
= xfrm_net_exit
,
2584 void __init
xfrm_init(void)
2586 register_pernet_subsys(&xfrm_net_ops
);
2590 #ifdef CONFIG_AUDITSYSCALL
2591 static void xfrm_audit_common_policyinfo(struct xfrm_policy
*xp
,
2592 struct audit_buffer
*audit_buf
)
2594 struct xfrm_sec_ctx
*ctx
= xp
->security
;
2595 struct xfrm_selector
*sel
= &xp
->selector
;
2598 audit_log_format(audit_buf
, " sec_alg=%u sec_doi=%u sec_obj=%s",
2599 ctx
->ctx_alg
, ctx
->ctx_doi
, ctx
->ctx_str
);
2601 switch(sel
->family
) {
2603 audit_log_format(audit_buf
, " src=%pI4", &sel
->saddr
.a4
);
2604 if (sel
->prefixlen_s
!= 32)
2605 audit_log_format(audit_buf
, " src_prefixlen=%d",
2607 audit_log_format(audit_buf
, " dst=%pI4", &sel
->daddr
.a4
);
2608 if (sel
->prefixlen_d
!= 32)
2609 audit_log_format(audit_buf
, " dst_prefixlen=%d",
2613 audit_log_format(audit_buf
, " src=%pI6", sel
->saddr
.a6
);
2614 if (sel
->prefixlen_s
!= 128)
2615 audit_log_format(audit_buf
, " src_prefixlen=%d",
2617 audit_log_format(audit_buf
, " dst=%pI6", sel
->daddr
.a6
);
2618 if (sel
->prefixlen_d
!= 128)
2619 audit_log_format(audit_buf
, " dst_prefixlen=%d",
2625 void xfrm_audit_policy_add(struct xfrm_policy
*xp
, int result
,
2626 uid_t auid
, u32 sessionid
, u32 secid
)
2628 struct audit_buffer
*audit_buf
;
2630 audit_buf
= xfrm_audit_start("SPD-add");
2631 if (audit_buf
== NULL
)
2633 xfrm_audit_helper_usrinfo(auid
, sessionid
, secid
, audit_buf
);
2634 audit_log_format(audit_buf
, " res=%u", result
);
2635 xfrm_audit_common_policyinfo(xp
, audit_buf
);
2636 audit_log_end(audit_buf
);
2638 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add
);
2640 void xfrm_audit_policy_delete(struct xfrm_policy
*xp
, int result
,
2641 uid_t auid
, u32 sessionid
, u32 secid
)
2643 struct audit_buffer
*audit_buf
;
2645 audit_buf
= xfrm_audit_start("SPD-delete");
2646 if (audit_buf
== NULL
)
2648 xfrm_audit_helper_usrinfo(auid
, sessionid
, secid
, audit_buf
);
2649 audit_log_format(audit_buf
, " res=%u", result
);
2650 xfrm_audit_common_policyinfo(xp
, audit_buf
);
2651 audit_log_end(audit_buf
);
2653 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete
);
2656 #ifdef CONFIG_XFRM_MIGRATE
2657 static int xfrm_migrate_selector_match(struct xfrm_selector
*sel_cmp
,
2658 struct xfrm_selector
*sel_tgt
)
2660 if (sel_cmp
->proto
== IPSEC_ULPROTO_ANY
) {
2661 if (sel_tgt
->family
== sel_cmp
->family
&&
2662 xfrm_addr_cmp(&sel_tgt
->daddr
, &sel_cmp
->daddr
,
2663 sel_cmp
->family
) == 0 &&
2664 xfrm_addr_cmp(&sel_tgt
->saddr
, &sel_cmp
->saddr
,
2665 sel_cmp
->family
) == 0 &&
2666 sel_tgt
->prefixlen_d
== sel_cmp
->prefixlen_d
&&
2667 sel_tgt
->prefixlen_s
== sel_cmp
->prefixlen_s
) {
2671 if (memcmp(sel_tgt
, sel_cmp
, sizeof(*sel_tgt
)) == 0) {
2678 static struct xfrm_policy
* xfrm_migrate_policy_find(struct xfrm_selector
*sel
,
2681 struct xfrm_policy
*pol
, *ret
= NULL
;
2682 struct hlist_node
*entry
;
2683 struct hlist_head
*chain
;
2686 read_lock_bh(&xfrm_policy_lock
);
2687 chain
= policy_hash_direct(&init_net
, &sel
->daddr
, &sel
->saddr
, sel
->family
, dir
);
2688 hlist_for_each_entry(pol
, entry
, chain
, bydst
) {
2689 if (xfrm_migrate_selector_match(sel
, &pol
->selector
) &&
2690 pol
->type
== type
) {
2692 priority
= ret
->priority
;
2696 chain
= &init_net
.xfrm
.policy_inexact
[dir
];
2697 hlist_for_each_entry(pol
, entry
, chain
, bydst
) {
2698 if (xfrm_migrate_selector_match(sel
, &pol
->selector
) &&
2699 pol
->type
== type
&&
2700 pol
->priority
< priority
) {
2709 read_unlock_bh(&xfrm_policy_lock
);
2714 static int migrate_tmpl_match(struct xfrm_migrate
*m
, struct xfrm_tmpl
*t
)
2718 if (t
->mode
== m
->mode
&& t
->id
.proto
== m
->proto
&&
2719 (m
->reqid
== 0 || t
->reqid
== m
->reqid
)) {
2721 case XFRM_MODE_TUNNEL
:
2722 case XFRM_MODE_BEET
:
2723 if (xfrm_addr_cmp(&t
->id
.daddr
, &m
->old_daddr
,
2724 m
->old_family
) == 0 &&
2725 xfrm_addr_cmp(&t
->saddr
, &m
->old_saddr
,
2726 m
->old_family
) == 0) {
2730 case XFRM_MODE_TRANSPORT
:
2731 /* in case of transport mode, template does not store
2732 any IP addresses, hence we just compare mode and
2743 /* update endpoint address(es) of template(s) */
2744 static int xfrm_policy_migrate(struct xfrm_policy
*pol
,
2745 struct xfrm_migrate
*m
, int num_migrate
)
2747 struct xfrm_migrate
*mp
;
2748 struct dst_entry
*dst
;
2751 write_lock_bh(&pol
->lock
);
2752 if (unlikely(pol
->walk
.dead
)) {
2753 /* target policy has been deleted */
2754 write_unlock_bh(&pol
->lock
);
2758 for (i
= 0; i
< pol
->xfrm_nr
; i
++) {
2759 for (j
= 0, mp
= m
; j
< num_migrate
; j
++, mp
++) {
2760 if (!migrate_tmpl_match(mp
, &pol
->xfrm_vec
[i
]))
2763 if (pol
->xfrm_vec
[i
].mode
!= XFRM_MODE_TUNNEL
&&
2764 pol
->xfrm_vec
[i
].mode
!= XFRM_MODE_BEET
)
2766 /* update endpoints */
2767 memcpy(&pol
->xfrm_vec
[i
].id
.daddr
, &mp
->new_daddr
,
2768 sizeof(pol
->xfrm_vec
[i
].id
.daddr
));
2769 memcpy(&pol
->xfrm_vec
[i
].saddr
, &mp
->new_saddr
,
2770 sizeof(pol
->xfrm_vec
[i
].saddr
));
2771 pol
->xfrm_vec
[i
].encap_family
= mp
->new_family
;
2773 while ((dst
= pol
->bundles
) != NULL
) {
2774 pol
->bundles
= dst
->next
;
2780 write_unlock_bh(&pol
->lock
);
2788 static int xfrm_migrate_check(struct xfrm_migrate
*m
, int num_migrate
)
2792 if (num_migrate
< 1 || num_migrate
> XFRM_MAX_DEPTH
)
2795 for (i
= 0; i
< num_migrate
; i
++) {
2796 if ((xfrm_addr_cmp(&m
[i
].old_daddr
, &m
[i
].new_daddr
,
2797 m
[i
].old_family
) == 0) &&
2798 (xfrm_addr_cmp(&m
[i
].old_saddr
, &m
[i
].new_saddr
,
2799 m
[i
].old_family
) == 0))
2801 if (xfrm_addr_any(&m
[i
].new_daddr
, m
[i
].new_family
) ||
2802 xfrm_addr_any(&m
[i
].new_saddr
, m
[i
].new_family
))
2805 /* check if there is any duplicated entry */
2806 for (j
= i
+ 1; j
< num_migrate
; j
++) {
2807 if (!memcmp(&m
[i
].old_daddr
, &m
[j
].old_daddr
,
2808 sizeof(m
[i
].old_daddr
)) &&
2809 !memcmp(&m
[i
].old_saddr
, &m
[j
].old_saddr
,
2810 sizeof(m
[i
].old_saddr
)) &&
2811 m
[i
].proto
== m
[j
].proto
&&
2812 m
[i
].mode
== m
[j
].mode
&&
2813 m
[i
].reqid
== m
[j
].reqid
&&
2814 m
[i
].old_family
== m
[j
].old_family
)
2822 int xfrm_migrate(struct xfrm_selector
*sel
, u8 dir
, u8 type
,
2823 struct xfrm_migrate
*m
, int num_migrate
,
2824 struct xfrm_kmaddress
*k
)
2826 int i
, err
, nx_cur
= 0, nx_new
= 0;
2827 struct xfrm_policy
*pol
= NULL
;
2828 struct xfrm_state
*x
, *xc
;
2829 struct xfrm_state
*x_cur
[XFRM_MAX_DEPTH
];
2830 struct xfrm_state
*x_new
[XFRM_MAX_DEPTH
];
2831 struct xfrm_migrate
*mp
;
2833 if ((err
= xfrm_migrate_check(m
, num_migrate
)) < 0)
2836 /* Stage 1 - find policy */
2837 if ((pol
= xfrm_migrate_policy_find(sel
, dir
, type
)) == NULL
) {
2842 /* Stage 2 - find and update state(s) */
2843 for (i
= 0, mp
= m
; i
< num_migrate
; i
++, mp
++) {
2844 if ((x
= xfrm_migrate_state_find(mp
))) {
2847 if ((xc
= xfrm_state_migrate(x
, mp
))) {
2857 /* Stage 3 - update policy */
2858 if ((err
= xfrm_policy_migrate(pol
, m
, num_migrate
)) < 0)
2861 /* Stage 4 - delete old state(s) */
2863 xfrm_states_put(x_cur
, nx_cur
);
2864 xfrm_states_delete(x_cur
, nx_cur
);
2867 /* Stage 5 - announce */
2868 km_migrate(sel
, dir
, type
, m
, num_migrate
, k
);
2880 xfrm_states_put(x_cur
, nx_cur
);
2882 xfrm_states_delete(x_new
, nx_new
);
2886 EXPORT_SYMBOL(xfrm_migrate
);