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>
32 #ifdef CONFIG_XFRM_STATISTICS
36 #include "xfrm_hash.h"
38 #define XFRM_QUEUE_TMO_MIN ((unsigned)(HZ/10))
39 #define XFRM_QUEUE_TMO_MAX ((unsigned)(60*HZ))
40 #define XFRM_MAX_QUEUE_LEN 100
42 static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock
);
43 static struct xfrm_policy_afinfo __rcu
*xfrm_policy_afinfo
[NPROTO
]
46 static struct kmem_cache
*xfrm_dst_cache __read_mostly
;
48 static void xfrm_init_pmtu(struct dst_entry
*dst
);
49 static int stale_bundle(struct dst_entry
*dst
);
50 static int xfrm_bundle_ok(struct xfrm_dst
*xdst
);
51 static void xfrm_policy_queue_process(unsigned long arg
);
53 static struct xfrm_policy
*__xfrm_policy_unlink(struct xfrm_policy
*pol
,
57 __xfrm4_selector_match(const struct xfrm_selector
*sel
, const struct flowi
*fl
)
59 const struct flowi4
*fl4
= &fl
->u
.ip4
;
61 return addr4_match(fl4
->daddr
, sel
->daddr
.a4
, sel
->prefixlen_d
) &&
62 addr4_match(fl4
->saddr
, sel
->saddr
.a4
, sel
->prefixlen_s
) &&
63 !((xfrm_flowi_dport(fl
, &fl4
->uli
) ^ sel
->dport
) & sel
->dport_mask
) &&
64 !((xfrm_flowi_sport(fl
, &fl4
->uli
) ^ sel
->sport
) & sel
->sport_mask
) &&
65 (fl4
->flowi4_proto
== sel
->proto
|| !sel
->proto
) &&
66 (fl4
->flowi4_oif
== sel
->ifindex
|| !sel
->ifindex
);
70 __xfrm6_selector_match(const struct xfrm_selector
*sel
, const struct flowi
*fl
)
72 const struct flowi6
*fl6
= &fl
->u
.ip6
;
74 return addr_match(&fl6
->daddr
, &sel
->daddr
, sel
->prefixlen_d
) &&
75 addr_match(&fl6
->saddr
, &sel
->saddr
, sel
->prefixlen_s
) &&
76 !((xfrm_flowi_dport(fl
, &fl6
->uli
) ^ sel
->dport
) & sel
->dport_mask
) &&
77 !((xfrm_flowi_sport(fl
, &fl6
->uli
) ^ sel
->sport
) & sel
->sport_mask
) &&
78 (fl6
->flowi6_proto
== sel
->proto
|| !sel
->proto
) &&
79 (fl6
->flowi6_oif
== sel
->ifindex
|| !sel
->ifindex
);
82 bool xfrm_selector_match(const struct xfrm_selector
*sel
, const struct flowi
*fl
,
83 unsigned short family
)
87 return __xfrm4_selector_match(sel
, fl
);
89 return __xfrm6_selector_match(sel
, fl
);
94 static struct xfrm_policy_afinfo
*xfrm_policy_get_afinfo(unsigned short family
)
96 struct xfrm_policy_afinfo
*afinfo
;
98 if (unlikely(family
>= NPROTO
))
101 afinfo
= rcu_dereference(xfrm_policy_afinfo
[family
]);
102 if (unlikely(!afinfo
))
107 static void xfrm_policy_put_afinfo(struct xfrm_policy_afinfo
*afinfo
)
112 static inline struct dst_entry
*__xfrm_dst_lookup(struct net
*net
, int tos
,
113 const xfrm_address_t
*saddr
,
114 const xfrm_address_t
*daddr
,
117 struct xfrm_policy_afinfo
*afinfo
;
118 struct dst_entry
*dst
;
120 afinfo
= xfrm_policy_get_afinfo(family
);
121 if (unlikely(afinfo
== NULL
))
122 return ERR_PTR(-EAFNOSUPPORT
);
124 dst
= afinfo
->dst_lookup(net
, tos
, saddr
, daddr
);
126 xfrm_policy_put_afinfo(afinfo
);
131 static inline struct dst_entry
*xfrm_dst_lookup(struct xfrm_state
*x
, int tos
,
132 xfrm_address_t
*prev_saddr
,
133 xfrm_address_t
*prev_daddr
,
136 struct net
*net
= xs_net(x
);
137 xfrm_address_t
*saddr
= &x
->props
.saddr
;
138 xfrm_address_t
*daddr
= &x
->id
.daddr
;
139 struct dst_entry
*dst
;
141 if (x
->type
->flags
& XFRM_TYPE_LOCAL_COADDR
) {
145 if (x
->type
->flags
& XFRM_TYPE_REMOTE_COADDR
) {
150 dst
= __xfrm_dst_lookup(net
, tos
, saddr
, daddr
, family
);
153 if (prev_saddr
!= saddr
)
154 memcpy(prev_saddr
, saddr
, sizeof(*prev_saddr
));
155 if (prev_daddr
!= daddr
)
156 memcpy(prev_daddr
, daddr
, sizeof(*prev_daddr
));
162 static inline unsigned long make_jiffies(long secs
)
164 if (secs
>= (MAX_SCHEDULE_TIMEOUT
-1)/HZ
)
165 return MAX_SCHEDULE_TIMEOUT
-1;
170 static void xfrm_policy_timer(unsigned long data
)
172 struct xfrm_policy
*xp
= (struct xfrm_policy
*)data
;
173 unsigned long now
= get_seconds();
174 long next
= LONG_MAX
;
178 read_lock(&xp
->lock
);
180 if (unlikely(xp
->walk
.dead
))
183 dir
= xfrm_policy_id2dir(xp
->index
);
185 if (xp
->lft
.hard_add_expires_seconds
) {
186 long tmo
= xp
->lft
.hard_add_expires_seconds
+
187 xp
->curlft
.add_time
- now
;
193 if (xp
->lft
.hard_use_expires_seconds
) {
194 long tmo
= xp
->lft
.hard_use_expires_seconds
+
195 (xp
->curlft
.use_time
? : xp
->curlft
.add_time
) - now
;
201 if (xp
->lft
.soft_add_expires_seconds
) {
202 long tmo
= xp
->lft
.soft_add_expires_seconds
+
203 xp
->curlft
.add_time
- now
;
206 tmo
= XFRM_KM_TIMEOUT
;
211 if (xp
->lft
.soft_use_expires_seconds
) {
212 long tmo
= xp
->lft
.soft_use_expires_seconds
+
213 (xp
->curlft
.use_time
? : xp
->curlft
.add_time
) - now
;
216 tmo
= XFRM_KM_TIMEOUT
;
223 km_policy_expired(xp
, dir
, 0, 0);
224 if (next
!= LONG_MAX
&&
225 !mod_timer(&xp
->timer
, jiffies
+ make_jiffies(next
)))
229 read_unlock(&xp
->lock
);
234 read_unlock(&xp
->lock
);
235 if (!xfrm_policy_delete(xp
, dir
))
236 km_policy_expired(xp
, dir
, 1, 0);
240 static struct flow_cache_object
*xfrm_policy_flo_get(struct flow_cache_object
*flo
)
242 struct xfrm_policy
*pol
= container_of(flo
, struct xfrm_policy
, flo
);
244 if (unlikely(pol
->walk
.dead
))
252 static int xfrm_policy_flo_check(struct flow_cache_object
*flo
)
254 struct xfrm_policy
*pol
= container_of(flo
, struct xfrm_policy
, flo
);
256 return !pol
->walk
.dead
;
259 static void xfrm_policy_flo_delete(struct flow_cache_object
*flo
)
261 xfrm_pol_put(container_of(flo
, struct xfrm_policy
, flo
));
264 static const struct flow_cache_ops xfrm_policy_fc_ops
= {
265 .get
= xfrm_policy_flo_get
,
266 .check
= xfrm_policy_flo_check
,
267 .delete = xfrm_policy_flo_delete
,
270 /* Allocate xfrm_policy. Not used here, it is supposed to be used by pfkeyv2
274 struct xfrm_policy
*xfrm_policy_alloc(struct net
*net
, gfp_t gfp
)
276 struct xfrm_policy
*policy
;
278 policy
= kzalloc(sizeof(struct xfrm_policy
), gfp
);
281 write_pnet(&policy
->xp_net
, net
);
282 INIT_LIST_HEAD(&policy
->walk
.all
);
283 INIT_HLIST_NODE(&policy
->bydst
);
284 INIT_HLIST_NODE(&policy
->byidx
);
285 rwlock_init(&policy
->lock
);
286 atomic_set(&policy
->refcnt
, 1);
287 skb_queue_head_init(&policy
->polq
.hold_queue
);
288 setup_timer(&policy
->timer
, xfrm_policy_timer
,
289 (unsigned long)policy
);
290 setup_timer(&policy
->polq
.hold_timer
, xfrm_policy_queue_process
,
291 (unsigned long)policy
);
292 policy
->flo
.ops
= &xfrm_policy_fc_ops
;
296 EXPORT_SYMBOL(xfrm_policy_alloc
);
298 /* Destroy xfrm_policy: descendant resources must be released to this moment. */
300 void xfrm_policy_destroy(struct xfrm_policy
*policy
)
302 BUG_ON(!policy
->walk
.dead
);
304 if (del_timer(&policy
->timer
) || del_timer(&policy
->polq
.hold_timer
))
307 security_xfrm_policy_free(policy
->security
);
310 EXPORT_SYMBOL(xfrm_policy_destroy
);
312 static void xfrm_queue_purge(struct sk_buff_head
*list
)
316 while ((skb
= skb_dequeue(list
)) != NULL
)
320 /* Rule must be locked. Release descentant resources, announce
321 * entry dead. The rule must be unlinked from lists to the moment.
324 static void xfrm_policy_kill(struct xfrm_policy
*policy
)
326 policy
->walk
.dead
= 1;
328 atomic_inc(&policy
->genid
);
330 if (del_timer(&policy
->polq
.hold_timer
))
331 xfrm_pol_put(policy
);
332 xfrm_queue_purge(&policy
->polq
.hold_queue
);
334 if (del_timer(&policy
->timer
))
335 xfrm_pol_put(policy
);
337 xfrm_pol_put(policy
);
340 static unsigned int xfrm_policy_hashmax __read_mostly
= 1 * 1024 * 1024;
342 static inline unsigned int idx_hash(struct net
*net
, u32 index
)
344 return __idx_hash(index
, net
->xfrm
.policy_idx_hmask
);
347 static struct hlist_head
*policy_hash_bysel(struct net
*net
,
348 const struct xfrm_selector
*sel
,
349 unsigned short family
, int dir
)
351 unsigned int hmask
= net
->xfrm
.policy_bydst
[dir
].hmask
;
352 unsigned int hash
= __sel_hash(sel
, family
, hmask
);
354 return (hash
== hmask
+ 1 ?
355 &net
->xfrm
.policy_inexact
[dir
] :
356 net
->xfrm
.policy_bydst
[dir
].table
+ hash
);
359 static struct hlist_head
*policy_hash_direct(struct net
*net
,
360 const xfrm_address_t
*daddr
,
361 const xfrm_address_t
*saddr
,
362 unsigned short family
, int dir
)
364 unsigned int hmask
= net
->xfrm
.policy_bydst
[dir
].hmask
;
365 unsigned int hash
= __addr_hash(daddr
, saddr
, family
, hmask
);
367 return net
->xfrm
.policy_bydst
[dir
].table
+ hash
;
370 static void xfrm_dst_hash_transfer(struct hlist_head
*list
,
371 struct hlist_head
*ndsttable
,
372 unsigned int nhashmask
)
374 struct hlist_node
*tmp
, *entry0
= NULL
;
375 struct xfrm_policy
*pol
;
379 hlist_for_each_entry_safe(pol
, tmp
, list
, bydst
) {
382 h
= __addr_hash(&pol
->selector
.daddr
, &pol
->selector
.saddr
,
383 pol
->family
, nhashmask
);
385 hlist_del(&pol
->bydst
);
386 hlist_add_head(&pol
->bydst
, ndsttable
+h
);
391 hlist_del(&pol
->bydst
);
392 hlist_add_after(entry0
, &pol
->bydst
);
394 entry0
= &pol
->bydst
;
396 if (!hlist_empty(list
)) {
402 static void xfrm_idx_hash_transfer(struct hlist_head
*list
,
403 struct hlist_head
*nidxtable
,
404 unsigned int nhashmask
)
406 struct hlist_node
*tmp
;
407 struct xfrm_policy
*pol
;
409 hlist_for_each_entry_safe(pol
, tmp
, list
, byidx
) {
412 h
= __idx_hash(pol
->index
, nhashmask
);
413 hlist_add_head(&pol
->byidx
, nidxtable
+h
);
417 static unsigned long xfrm_new_hash_mask(unsigned int old_hmask
)
419 return ((old_hmask
+ 1) << 1) - 1;
422 static void xfrm_bydst_resize(struct net
*net
, int dir
)
424 unsigned int hmask
= net
->xfrm
.policy_bydst
[dir
].hmask
;
425 unsigned int nhashmask
= xfrm_new_hash_mask(hmask
);
426 unsigned int nsize
= (nhashmask
+ 1) * sizeof(struct hlist_head
);
427 struct hlist_head
*odst
= net
->xfrm
.policy_bydst
[dir
].table
;
428 struct hlist_head
*ndst
= xfrm_hash_alloc(nsize
);
434 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
436 for (i
= hmask
; i
>= 0; i
--)
437 xfrm_dst_hash_transfer(odst
+ i
, ndst
, nhashmask
);
439 net
->xfrm
.policy_bydst
[dir
].table
= ndst
;
440 net
->xfrm
.policy_bydst
[dir
].hmask
= nhashmask
;
442 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
444 xfrm_hash_free(odst
, (hmask
+ 1) * sizeof(struct hlist_head
));
447 static void xfrm_byidx_resize(struct net
*net
, int total
)
449 unsigned int hmask
= net
->xfrm
.policy_idx_hmask
;
450 unsigned int nhashmask
= xfrm_new_hash_mask(hmask
);
451 unsigned int nsize
= (nhashmask
+ 1) * sizeof(struct hlist_head
);
452 struct hlist_head
*oidx
= net
->xfrm
.policy_byidx
;
453 struct hlist_head
*nidx
= xfrm_hash_alloc(nsize
);
459 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
461 for (i
= hmask
; i
>= 0; i
--)
462 xfrm_idx_hash_transfer(oidx
+ i
, nidx
, nhashmask
);
464 net
->xfrm
.policy_byidx
= nidx
;
465 net
->xfrm
.policy_idx_hmask
= nhashmask
;
467 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
469 xfrm_hash_free(oidx
, (hmask
+ 1) * sizeof(struct hlist_head
));
472 static inline int xfrm_bydst_should_resize(struct net
*net
, int dir
, int *total
)
474 unsigned int cnt
= net
->xfrm
.policy_count
[dir
];
475 unsigned int hmask
= net
->xfrm
.policy_bydst
[dir
].hmask
;
480 if ((hmask
+ 1) < xfrm_policy_hashmax
&&
487 static inline int xfrm_byidx_should_resize(struct net
*net
, int total
)
489 unsigned int hmask
= net
->xfrm
.policy_idx_hmask
;
491 if ((hmask
+ 1) < xfrm_policy_hashmax
&&
498 void xfrm_spd_getinfo(struct net
*net
, struct xfrmk_spdinfo
*si
)
500 read_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
501 si
->incnt
= net
->xfrm
.policy_count
[XFRM_POLICY_IN
];
502 si
->outcnt
= net
->xfrm
.policy_count
[XFRM_POLICY_OUT
];
503 si
->fwdcnt
= net
->xfrm
.policy_count
[XFRM_POLICY_FWD
];
504 si
->inscnt
= net
->xfrm
.policy_count
[XFRM_POLICY_IN
+XFRM_POLICY_MAX
];
505 si
->outscnt
= net
->xfrm
.policy_count
[XFRM_POLICY_OUT
+XFRM_POLICY_MAX
];
506 si
->fwdscnt
= net
->xfrm
.policy_count
[XFRM_POLICY_FWD
+XFRM_POLICY_MAX
];
507 si
->spdhcnt
= net
->xfrm
.policy_idx_hmask
;
508 si
->spdhmcnt
= xfrm_policy_hashmax
;
509 read_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
511 EXPORT_SYMBOL(xfrm_spd_getinfo
);
513 static DEFINE_MUTEX(hash_resize_mutex
);
514 static void xfrm_hash_resize(struct work_struct
*work
)
516 struct net
*net
= container_of(work
, struct net
, xfrm
.policy_hash_work
);
519 mutex_lock(&hash_resize_mutex
);
522 for (dir
= 0; dir
< XFRM_POLICY_MAX
* 2; dir
++) {
523 if (xfrm_bydst_should_resize(net
, dir
, &total
))
524 xfrm_bydst_resize(net
, dir
);
526 if (xfrm_byidx_should_resize(net
, total
))
527 xfrm_byidx_resize(net
, total
);
529 mutex_unlock(&hash_resize_mutex
);
532 /* Generate new index... KAME seems to generate them ordered by cost
533 * of an absolute inpredictability of ordering of rules. This will not pass. */
534 static u32
xfrm_gen_index(struct net
*net
, int dir
, u32 index
)
536 static u32 idx_generator
;
539 struct hlist_head
*list
;
540 struct xfrm_policy
*p
;
545 idx
= (idx_generator
| dir
);
554 list
= net
->xfrm
.policy_byidx
+ idx_hash(net
, idx
);
556 hlist_for_each_entry(p
, list
, byidx
) {
557 if (p
->index
== idx
) {
567 static inline int selector_cmp(struct xfrm_selector
*s1
, struct xfrm_selector
*s2
)
569 u32
*p1
= (u32
*) s1
;
570 u32
*p2
= (u32
*) s2
;
571 int len
= sizeof(struct xfrm_selector
) / sizeof(u32
);
574 for (i
= 0; i
< len
; i
++) {
582 static void xfrm_policy_requeue(struct xfrm_policy
*old
,
583 struct xfrm_policy
*new)
585 struct xfrm_policy_queue
*pq
= &old
->polq
;
586 struct sk_buff_head list
;
588 __skb_queue_head_init(&list
);
590 spin_lock_bh(&pq
->hold_queue
.lock
);
591 skb_queue_splice_init(&pq
->hold_queue
, &list
);
592 if (del_timer(&pq
->hold_timer
))
594 spin_unlock_bh(&pq
->hold_queue
.lock
);
596 if (skb_queue_empty(&list
))
601 spin_lock_bh(&pq
->hold_queue
.lock
);
602 skb_queue_splice(&list
, &pq
->hold_queue
);
603 pq
->timeout
= XFRM_QUEUE_TMO_MIN
;
604 if (!mod_timer(&pq
->hold_timer
, jiffies
))
606 spin_unlock_bh(&pq
->hold_queue
.lock
);
609 static bool xfrm_policy_mark_match(struct xfrm_policy
*policy
,
610 struct xfrm_policy
*pol
)
612 u32 mark
= policy
->mark
.v
& policy
->mark
.m
;
614 if (policy
->mark
.v
== pol
->mark
.v
&& policy
->mark
.m
== pol
->mark
.m
)
617 if ((mark
& pol
->mark
.m
) == pol
->mark
.v
&&
618 policy
->priority
== pol
->priority
)
624 int xfrm_policy_insert(int dir
, struct xfrm_policy
*policy
, int excl
)
626 struct net
*net
= xp_net(policy
);
627 struct xfrm_policy
*pol
;
628 struct xfrm_policy
*delpol
;
629 struct hlist_head
*chain
;
630 struct hlist_node
*newpos
;
632 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
633 chain
= policy_hash_bysel(net
, &policy
->selector
, policy
->family
, dir
);
636 hlist_for_each_entry(pol
, chain
, bydst
) {
637 if (pol
->type
== policy
->type
&&
638 !selector_cmp(&pol
->selector
, &policy
->selector
) &&
639 xfrm_policy_mark_match(policy
, pol
) &&
640 xfrm_sec_ctx_match(pol
->security
, policy
->security
) &&
643 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
647 if (policy
->priority
> pol
->priority
)
649 } else if (policy
->priority
>= pol
->priority
) {
650 newpos
= &pol
->bydst
;
657 hlist_add_after(newpos
, &policy
->bydst
);
659 hlist_add_head(&policy
->bydst
, chain
);
660 xfrm_pol_hold(policy
);
661 net
->xfrm
.policy_count
[dir
]++;
662 atomic_inc(&net
->xfrm
.flow_cache_genid
);
664 /* After previous checking, family can either be AF_INET or AF_INET6 */
665 if (policy
->family
== AF_INET
)
666 rt_genid_bump_ipv4(net
);
668 rt_genid_bump_ipv6(net
);
671 xfrm_policy_requeue(delpol
, policy
);
672 __xfrm_policy_unlink(delpol
, dir
);
674 policy
->index
= delpol
? delpol
->index
: xfrm_gen_index(net
, dir
, policy
->index
);
675 hlist_add_head(&policy
->byidx
, net
->xfrm
.policy_byidx
+idx_hash(net
, policy
->index
));
676 policy
->curlft
.add_time
= get_seconds();
677 policy
->curlft
.use_time
= 0;
678 if (!mod_timer(&policy
->timer
, jiffies
+ HZ
))
679 xfrm_pol_hold(policy
);
680 list_add(&policy
->walk
.all
, &net
->xfrm
.policy_all
);
681 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
684 xfrm_policy_kill(delpol
);
685 else if (xfrm_bydst_should_resize(net
, dir
, NULL
))
686 schedule_work(&net
->xfrm
.policy_hash_work
);
690 EXPORT_SYMBOL(xfrm_policy_insert
);
692 struct xfrm_policy
*xfrm_policy_bysel_ctx(struct net
*net
, u32 mark
, u8 type
,
693 int dir
, struct xfrm_selector
*sel
,
694 struct xfrm_sec_ctx
*ctx
, int delete,
697 struct xfrm_policy
*pol
, *ret
;
698 struct hlist_head
*chain
;
701 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
702 chain
= policy_hash_bysel(net
, sel
, sel
->family
, dir
);
704 hlist_for_each_entry(pol
, chain
, bydst
) {
705 if (pol
->type
== type
&&
706 (mark
& pol
->mark
.m
) == pol
->mark
.v
&&
707 !selector_cmp(sel
, &pol
->selector
) &&
708 xfrm_sec_ctx_match(ctx
, pol
->security
)) {
711 *err
= security_xfrm_policy_delete(
714 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
717 __xfrm_policy_unlink(pol
, dir
);
723 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
726 xfrm_policy_kill(ret
);
729 EXPORT_SYMBOL(xfrm_policy_bysel_ctx
);
731 struct xfrm_policy
*xfrm_policy_byid(struct net
*net
, u32 mark
, u8 type
,
732 int dir
, u32 id
, int delete, int *err
)
734 struct xfrm_policy
*pol
, *ret
;
735 struct hlist_head
*chain
;
738 if (xfrm_policy_id2dir(id
) != dir
)
742 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
743 chain
= net
->xfrm
.policy_byidx
+ idx_hash(net
, id
);
745 hlist_for_each_entry(pol
, chain
, byidx
) {
746 if (pol
->type
== type
&& pol
->index
== id
&&
747 (mark
& pol
->mark
.m
) == pol
->mark
.v
) {
750 *err
= security_xfrm_policy_delete(
753 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
756 __xfrm_policy_unlink(pol
, dir
);
762 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
765 xfrm_policy_kill(ret
);
768 EXPORT_SYMBOL(xfrm_policy_byid
);
770 #ifdef CONFIG_SECURITY_NETWORK_XFRM
772 xfrm_policy_flush_secctx_check(struct net
*net
, u8 type
, struct xfrm_audit
*audit_info
)
776 for (dir
= 0; dir
< XFRM_POLICY_MAX
; dir
++) {
777 struct xfrm_policy
*pol
;
780 hlist_for_each_entry(pol
,
781 &net
->xfrm
.policy_inexact
[dir
], bydst
) {
782 if (pol
->type
!= type
)
784 err
= security_xfrm_policy_delete(pol
->security
);
786 xfrm_audit_policy_delete(pol
, 0,
787 audit_info
->loginuid
,
788 audit_info
->sessionid
,
793 for (i
= net
->xfrm
.policy_bydst
[dir
].hmask
; i
>= 0; i
--) {
794 hlist_for_each_entry(pol
,
795 net
->xfrm
.policy_bydst
[dir
].table
+ i
,
797 if (pol
->type
!= type
)
799 err
= security_xfrm_policy_delete(
802 xfrm_audit_policy_delete(pol
, 0,
803 audit_info
->loginuid
,
804 audit_info
->sessionid
,
815 xfrm_policy_flush_secctx_check(struct net
*net
, u8 type
, struct xfrm_audit
*audit_info
)
821 int xfrm_policy_flush(struct net
*net
, u8 type
, struct xfrm_audit
*audit_info
)
823 int dir
, err
= 0, cnt
= 0;
825 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
827 err
= xfrm_policy_flush_secctx_check(net
, type
, audit_info
);
831 for (dir
= 0; dir
< XFRM_POLICY_MAX
; dir
++) {
832 struct xfrm_policy
*pol
;
836 hlist_for_each_entry(pol
,
837 &net
->xfrm
.policy_inexact
[dir
], bydst
) {
838 if (pol
->type
!= type
)
840 __xfrm_policy_unlink(pol
, dir
);
841 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
844 xfrm_audit_policy_delete(pol
, 1, audit_info
->loginuid
,
845 audit_info
->sessionid
,
848 xfrm_policy_kill(pol
);
850 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
854 for (i
= net
->xfrm
.policy_bydst
[dir
].hmask
; i
>= 0; i
--) {
856 hlist_for_each_entry(pol
,
857 net
->xfrm
.policy_bydst
[dir
].table
+ i
,
859 if (pol
->type
!= type
)
861 __xfrm_policy_unlink(pol
, dir
);
862 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
865 xfrm_audit_policy_delete(pol
, 1,
866 audit_info
->loginuid
,
867 audit_info
->sessionid
,
869 xfrm_policy_kill(pol
);
871 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
880 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
883 EXPORT_SYMBOL(xfrm_policy_flush
);
885 int xfrm_policy_walk(struct net
*net
, struct xfrm_policy_walk
*walk
,
886 int (*func
)(struct xfrm_policy
*, int, int, void*),
889 struct xfrm_policy
*pol
;
890 struct xfrm_policy_walk_entry
*x
;
893 if (walk
->type
>= XFRM_POLICY_TYPE_MAX
&&
894 walk
->type
!= XFRM_POLICY_TYPE_ANY
)
897 if (list_empty(&walk
->walk
.all
) && walk
->seq
!= 0)
900 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
901 if (list_empty(&walk
->walk
.all
))
902 x
= list_first_entry(&net
->xfrm
.policy_all
, struct xfrm_policy_walk_entry
, all
);
904 x
= list_entry(&walk
->walk
.all
, struct xfrm_policy_walk_entry
, all
);
905 list_for_each_entry_from(x
, &net
->xfrm
.policy_all
, all
) {
908 pol
= container_of(x
, struct xfrm_policy
, walk
);
909 if (walk
->type
!= XFRM_POLICY_TYPE_ANY
&&
910 walk
->type
!= pol
->type
)
912 error
= func(pol
, xfrm_policy_id2dir(pol
->index
),
915 list_move_tail(&walk
->walk
.all
, &x
->all
);
920 if (walk
->seq
== 0) {
924 list_del_init(&walk
->walk
.all
);
926 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
929 EXPORT_SYMBOL(xfrm_policy_walk
);
931 void xfrm_policy_walk_init(struct xfrm_policy_walk
*walk
, u8 type
)
933 INIT_LIST_HEAD(&walk
->walk
.all
);
938 EXPORT_SYMBOL(xfrm_policy_walk_init
);
940 void xfrm_policy_walk_done(struct xfrm_policy_walk
*walk
, struct net
*net
)
942 if (list_empty(&walk
->walk
.all
))
945 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
); /*FIXME where is net? */
946 list_del(&walk
->walk
.all
);
947 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
949 EXPORT_SYMBOL(xfrm_policy_walk_done
);
952 * Find policy to apply to this flow.
954 * Returns 0 if policy found, else an -errno.
956 static int xfrm_policy_match(const struct xfrm_policy
*pol
,
957 const struct flowi
*fl
,
958 u8 type
, u16 family
, int dir
)
960 const struct xfrm_selector
*sel
= &pol
->selector
;
964 if (pol
->family
!= family
||
965 (fl
->flowi_mark
& pol
->mark
.m
) != pol
->mark
.v
||
969 match
= xfrm_selector_match(sel
, fl
, family
);
971 ret
= security_xfrm_policy_lookup(pol
->security
, fl
->flowi_secid
,
977 static struct xfrm_policy
*xfrm_policy_lookup_bytype(struct net
*net
, u8 type
,
978 const struct flowi
*fl
,
982 struct xfrm_policy
*pol
, *ret
;
983 const xfrm_address_t
*daddr
, *saddr
;
984 struct hlist_head
*chain
;
987 daddr
= xfrm_flowi_daddr(fl
, family
);
988 saddr
= xfrm_flowi_saddr(fl
, family
);
989 if (unlikely(!daddr
|| !saddr
))
992 read_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
993 chain
= policy_hash_direct(net
, daddr
, saddr
, family
, dir
);
995 hlist_for_each_entry(pol
, chain
, bydst
) {
996 err
= xfrm_policy_match(pol
, fl
, type
, family
, dir
);
1006 priority
= ret
->priority
;
1010 chain
= &net
->xfrm
.policy_inexact
[dir
];
1011 hlist_for_each_entry(pol
, chain
, bydst
) {
1012 err
= xfrm_policy_match(pol
, fl
, type
, family
, dir
);
1020 } else if (pol
->priority
< priority
) {
1028 read_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
1033 static struct xfrm_policy
*
1034 __xfrm_policy_lookup(struct net
*net
, const struct flowi
*fl
, u16 family
, u8 dir
)
1036 #ifdef CONFIG_XFRM_SUB_POLICY
1037 struct xfrm_policy
*pol
;
1039 pol
= xfrm_policy_lookup_bytype(net
, XFRM_POLICY_TYPE_SUB
, fl
, family
, dir
);
1043 return xfrm_policy_lookup_bytype(net
, XFRM_POLICY_TYPE_MAIN
, fl
, family
, dir
);
1046 static int flow_to_policy_dir(int dir
)
1048 if (XFRM_POLICY_IN
== FLOW_DIR_IN
&&
1049 XFRM_POLICY_OUT
== FLOW_DIR_OUT
&&
1050 XFRM_POLICY_FWD
== FLOW_DIR_FWD
)
1056 return XFRM_POLICY_IN
;
1058 return XFRM_POLICY_OUT
;
1060 return XFRM_POLICY_FWD
;
1064 static struct flow_cache_object
*
1065 xfrm_policy_lookup(struct net
*net
, const struct flowi
*fl
, u16 family
,
1066 u8 dir
, struct flow_cache_object
*old_obj
, void *ctx
)
1068 struct xfrm_policy
*pol
;
1071 xfrm_pol_put(container_of(old_obj
, struct xfrm_policy
, flo
));
1073 pol
= __xfrm_policy_lookup(net
, fl
, family
, flow_to_policy_dir(dir
));
1074 if (IS_ERR_OR_NULL(pol
))
1075 return ERR_CAST(pol
);
1077 /* Resolver returns two references:
1078 * one for cache and one for caller of flow_cache_lookup() */
1084 static inline int policy_to_flow_dir(int dir
)
1086 if (XFRM_POLICY_IN
== FLOW_DIR_IN
&&
1087 XFRM_POLICY_OUT
== FLOW_DIR_OUT
&&
1088 XFRM_POLICY_FWD
== FLOW_DIR_FWD
)
1092 case XFRM_POLICY_IN
:
1094 case XFRM_POLICY_OUT
:
1095 return FLOW_DIR_OUT
;
1096 case XFRM_POLICY_FWD
:
1097 return FLOW_DIR_FWD
;
1101 static struct xfrm_policy
*xfrm_sk_policy_lookup(struct sock
*sk
, int dir
,
1102 const struct flowi
*fl
)
1104 struct xfrm_policy
*pol
;
1105 struct net
*net
= sock_net(sk
);
1107 read_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
1108 if ((pol
= sk
->sk_policy
[dir
]) != NULL
) {
1109 bool match
= xfrm_selector_match(&pol
->selector
, fl
,
1114 if ((sk
->sk_mark
& pol
->mark
.m
) != pol
->mark
.v
) {
1118 err
= security_xfrm_policy_lookup(pol
->security
,
1120 policy_to_flow_dir(dir
));
1123 else if (err
== -ESRCH
)
1131 read_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
1135 static void __xfrm_policy_link(struct xfrm_policy
*pol
, int dir
)
1137 struct net
*net
= xp_net(pol
);
1138 struct hlist_head
*chain
= policy_hash_bysel(net
, &pol
->selector
,
1141 list_add(&pol
->walk
.all
, &net
->xfrm
.policy_all
);
1142 hlist_add_head(&pol
->bydst
, chain
);
1143 hlist_add_head(&pol
->byidx
, net
->xfrm
.policy_byidx
+idx_hash(net
, pol
->index
));
1144 net
->xfrm
.policy_count
[dir
]++;
1147 if (xfrm_bydst_should_resize(net
, dir
, NULL
))
1148 schedule_work(&net
->xfrm
.policy_hash_work
);
1151 static struct xfrm_policy
*__xfrm_policy_unlink(struct xfrm_policy
*pol
,
1154 struct net
*net
= xp_net(pol
);
1156 if (hlist_unhashed(&pol
->bydst
))
1159 hlist_del_init(&pol
->bydst
);
1160 hlist_del(&pol
->byidx
);
1161 list_del(&pol
->walk
.all
);
1162 net
->xfrm
.policy_count
[dir
]--;
1167 int xfrm_policy_delete(struct xfrm_policy
*pol
, int dir
)
1169 struct net
*net
= xp_net(pol
);
1171 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
1172 pol
= __xfrm_policy_unlink(pol
, dir
);
1173 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
1175 xfrm_policy_kill(pol
);
1180 EXPORT_SYMBOL(xfrm_policy_delete
);
1182 int xfrm_sk_policy_insert(struct sock
*sk
, int dir
, struct xfrm_policy
*pol
)
1184 struct net
*net
= xp_net(pol
);
1185 struct xfrm_policy
*old_pol
;
1187 #ifdef CONFIG_XFRM_SUB_POLICY
1188 if (pol
&& pol
->type
!= XFRM_POLICY_TYPE_MAIN
)
1192 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
1193 old_pol
= sk
->sk_policy
[dir
];
1194 sk
->sk_policy
[dir
] = pol
;
1196 pol
->curlft
.add_time
= get_seconds();
1197 pol
->index
= xfrm_gen_index(net
, XFRM_POLICY_MAX
+dir
, 0);
1198 __xfrm_policy_link(pol
, XFRM_POLICY_MAX
+dir
);
1202 xfrm_policy_requeue(old_pol
, pol
);
1204 /* Unlinking succeeds always. This is the only function
1205 * allowed to delete or replace socket policy.
1207 __xfrm_policy_unlink(old_pol
, XFRM_POLICY_MAX
+dir
);
1209 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
1212 xfrm_policy_kill(old_pol
);
1217 static struct xfrm_policy
*clone_policy(const struct xfrm_policy
*old
, int dir
)
1219 struct xfrm_policy
*newp
= xfrm_policy_alloc(xp_net(old
), GFP_ATOMIC
);
1220 struct net
*net
= xp_net(old
);
1223 newp
->selector
= old
->selector
;
1224 if (security_xfrm_policy_clone(old
->security
,
1227 return NULL
; /* ENOMEM */
1229 newp
->lft
= old
->lft
;
1230 newp
->curlft
= old
->curlft
;
1231 newp
->mark
= old
->mark
;
1232 newp
->action
= old
->action
;
1233 newp
->flags
= old
->flags
;
1234 newp
->xfrm_nr
= old
->xfrm_nr
;
1235 newp
->index
= old
->index
;
1236 newp
->type
= old
->type
;
1237 memcpy(newp
->xfrm_vec
, old
->xfrm_vec
,
1238 newp
->xfrm_nr
*sizeof(struct xfrm_tmpl
));
1239 write_lock_bh(&net
->xfrm
.xfrm_policy_lock
);
1240 __xfrm_policy_link(newp
, XFRM_POLICY_MAX
+dir
);
1241 write_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
1247 int __xfrm_sk_clone_policy(struct sock
*sk
)
1249 struct xfrm_policy
*p0
= sk
->sk_policy
[0],
1250 *p1
= sk
->sk_policy
[1];
1252 sk
->sk_policy
[0] = sk
->sk_policy
[1] = NULL
;
1253 if (p0
&& (sk
->sk_policy
[0] = clone_policy(p0
, 0)) == NULL
)
1255 if (p1
&& (sk
->sk_policy
[1] = clone_policy(p1
, 1)) == NULL
)
1261 xfrm_get_saddr(struct net
*net
, xfrm_address_t
*local
, xfrm_address_t
*remote
,
1262 unsigned short family
)
1265 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
1267 if (unlikely(afinfo
== NULL
))
1269 err
= afinfo
->get_saddr(net
, local
, remote
);
1270 xfrm_policy_put_afinfo(afinfo
);
1274 /* Resolve list of templates for the flow, given policy. */
1277 xfrm_tmpl_resolve_one(struct xfrm_policy
*policy
, const struct flowi
*fl
,
1278 struct xfrm_state
**xfrm
, unsigned short family
)
1280 struct net
*net
= xp_net(policy
);
1283 xfrm_address_t
*daddr
= xfrm_flowi_daddr(fl
, family
);
1284 xfrm_address_t
*saddr
= xfrm_flowi_saddr(fl
, family
);
1287 for (nx
= 0, i
= 0; i
< policy
->xfrm_nr
; i
++) {
1288 struct xfrm_state
*x
;
1289 xfrm_address_t
*remote
= daddr
;
1290 xfrm_address_t
*local
= saddr
;
1291 struct xfrm_tmpl
*tmpl
= &policy
->xfrm_vec
[i
];
1293 if (tmpl
->mode
== XFRM_MODE_TUNNEL
||
1294 tmpl
->mode
== XFRM_MODE_BEET
) {
1295 remote
= &tmpl
->id
.daddr
;
1296 local
= &tmpl
->saddr
;
1297 if (xfrm_addr_any(local
, tmpl
->encap_family
)) {
1298 error
= xfrm_get_saddr(net
, &tmp
, remote
, tmpl
->encap_family
);
1305 x
= xfrm_state_find(remote
, local
, fl
, tmpl
, policy
, &error
, family
);
1307 if (x
&& x
->km
.state
== XFRM_STATE_VALID
) {
1314 error
= (x
->km
.state
== XFRM_STATE_ERROR
?
1317 } else if (error
== -ESRCH
) {
1321 if (!tmpl
->optional
)
1327 for (nx
--; nx
>= 0; nx
--)
1328 xfrm_state_put(xfrm
[nx
]);
1333 xfrm_tmpl_resolve(struct xfrm_policy
**pols
, int npols
, const struct flowi
*fl
,
1334 struct xfrm_state
**xfrm
, unsigned short family
)
1336 struct xfrm_state
*tp
[XFRM_MAX_DEPTH
];
1337 struct xfrm_state
**tpp
= (npols
> 1) ? tp
: xfrm
;
1343 for (i
= 0; i
< npols
; i
++) {
1344 if (cnx
+ pols
[i
]->xfrm_nr
>= XFRM_MAX_DEPTH
) {
1349 ret
= xfrm_tmpl_resolve_one(pols
[i
], fl
, &tpp
[cnx
], family
);
1357 /* found states are sorted for outbound processing */
1359 xfrm_state_sort(xfrm
, tpp
, cnx
, family
);
1364 for (cnx
--; cnx
>= 0; cnx
--)
1365 xfrm_state_put(tpp
[cnx
]);
1370 /* Check that the bundle accepts the flow and its components are
1374 static inline int xfrm_get_tos(const struct flowi
*fl
, int family
)
1376 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
1382 tos
= afinfo
->get_tos(fl
);
1384 xfrm_policy_put_afinfo(afinfo
);
1389 static struct flow_cache_object
*xfrm_bundle_flo_get(struct flow_cache_object
*flo
)
1391 struct xfrm_dst
*xdst
= container_of(flo
, struct xfrm_dst
, flo
);
1392 struct dst_entry
*dst
= &xdst
->u
.dst
;
1394 if (xdst
->route
== NULL
) {
1395 /* Dummy bundle - if it has xfrms we were not
1396 * able to build bundle as template resolution failed.
1397 * It means we need to try again resolving. */
1398 if (xdst
->num_xfrms
> 0)
1400 } else if (dst
->flags
& DST_XFRM_QUEUE
) {
1404 if (stale_bundle(dst
))
1412 static int xfrm_bundle_flo_check(struct flow_cache_object
*flo
)
1414 struct xfrm_dst
*xdst
= container_of(flo
, struct xfrm_dst
, flo
);
1415 struct dst_entry
*dst
= &xdst
->u
.dst
;
1419 if (stale_bundle(dst
))
1425 static void xfrm_bundle_flo_delete(struct flow_cache_object
*flo
)
1427 struct xfrm_dst
*xdst
= container_of(flo
, struct xfrm_dst
, flo
);
1428 struct dst_entry
*dst
= &xdst
->u
.dst
;
1433 static const struct flow_cache_ops xfrm_bundle_fc_ops
= {
1434 .get
= xfrm_bundle_flo_get
,
1435 .check
= xfrm_bundle_flo_check
,
1436 .delete = xfrm_bundle_flo_delete
,
1439 static inline struct xfrm_dst
*xfrm_alloc_dst(struct net
*net
, int family
)
1441 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
1442 struct dst_ops
*dst_ops
;
1443 struct xfrm_dst
*xdst
;
1446 return ERR_PTR(-EINVAL
);
1450 dst_ops
= &net
->xfrm
.xfrm4_dst_ops
;
1452 #if IS_ENABLED(CONFIG_IPV6)
1454 dst_ops
= &net
->xfrm
.xfrm6_dst_ops
;
1460 xdst
= dst_alloc(dst_ops
, NULL
, 0, DST_OBSOLETE_NONE
, 0);
1463 struct dst_entry
*dst
= &xdst
->u
.dst
;
1465 memset(dst
+ 1, 0, sizeof(*xdst
) - sizeof(*dst
));
1466 xdst
->flo
.ops
= &xfrm_bundle_fc_ops
;
1467 if (afinfo
->init_dst
)
1468 afinfo
->init_dst(net
, xdst
);
1470 xdst
= ERR_PTR(-ENOBUFS
);
1472 xfrm_policy_put_afinfo(afinfo
);
1477 static inline int xfrm_init_path(struct xfrm_dst
*path
, struct dst_entry
*dst
,
1480 struct xfrm_policy_afinfo
*afinfo
=
1481 xfrm_policy_get_afinfo(dst
->ops
->family
);
1487 err
= afinfo
->init_path(path
, dst
, nfheader_len
);
1489 xfrm_policy_put_afinfo(afinfo
);
1494 static inline int xfrm_fill_dst(struct xfrm_dst
*xdst
, struct net_device
*dev
,
1495 const struct flowi
*fl
)
1497 struct xfrm_policy_afinfo
*afinfo
=
1498 xfrm_policy_get_afinfo(xdst
->u
.dst
.ops
->family
);
1504 err
= afinfo
->fill_dst(xdst
, dev
, fl
);
1506 xfrm_policy_put_afinfo(afinfo
);
1512 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
1513 * all the metrics... Shortly, bundle a bundle.
1516 static struct dst_entry
*xfrm_bundle_create(struct xfrm_policy
*policy
,
1517 struct xfrm_state
**xfrm
, int nx
,
1518 const struct flowi
*fl
,
1519 struct dst_entry
*dst
)
1521 struct net
*net
= xp_net(policy
);
1522 unsigned long now
= jiffies
;
1523 struct net_device
*dev
;
1524 struct xfrm_mode
*inner_mode
;
1525 struct dst_entry
*dst_prev
= NULL
;
1526 struct dst_entry
*dst0
= NULL
;
1530 int nfheader_len
= 0;
1531 int trailer_len
= 0;
1533 int family
= policy
->selector
.family
;
1534 xfrm_address_t saddr
, daddr
;
1536 xfrm_flowi_addr_get(fl
, &saddr
, &daddr
, family
);
1538 tos
= xfrm_get_tos(fl
, family
);
1545 for (; i
< nx
; i
++) {
1546 struct xfrm_dst
*xdst
= xfrm_alloc_dst(net
, family
);
1547 struct dst_entry
*dst1
= &xdst
->u
.dst
;
1549 err
= PTR_ERR(xdst
);
1555 if (xfrm
[i
]->sel
.family
== AF_UNSPEC
) {
1556 inner_mode
= xfrm_ip2inner_mode(xfrm
[i
],
1557 xfrm_af2proto(family
));
1559 err
= -EAFNOSUPPORT
;
1564 inner_mode
= xfrm
[i
]->inner_mode
;
1569 dst_prev
->child
= dst_clone(dst1
);
1570 dst1
->flags
|= DST_NOHASH
;
1574 dst_copy_metrics(dst1
, dst
);
1576 if (xfrm
[i
]->props
.mode
!= XFRM_MODE_TRANSPORT
) {
1577 family
= xfrm
[i
]->props
.family
;
1578 dst
= xfrm_dst_lookup(xfrm
[i
], tos
, &saddr
, &daddr
,
1586 dst1
->xfrm
= xfrm
[i
];
1587 xdst
->xfrm_genid
= xfrm
[i
]->genid
;
1589 dst1
->obsolete
= DST_OBSOLETE_FORCE_CHK
;
1590 dst1
->flags
|= DST_HOST
;
1591 dst1
->lastuse
= now
;
1593 dst1
->input
= dst_discard
;
1594 dst1
->output
= inner_mode
->afinfo
->output
;
1596 dst1
->next
= dst_prev
;
1599 header_len
+= xfrm
[i
]->props
.header_len
;
1600 if (xfrm
[i
]->type
->flags
& XFRM_TYPE_NON_FRAGMENT
)
1601 nfheader_len
+= xfrm
[i
]->props
.header_len
;
1602 trailer_len
+= xfrm
[i
]->props
.trailer_len
;
1605 dst_prev
->child
= dst
;
1613 xfrm_init_path((struct xfrm_dst
*)dst0
, dst
, nfheader_len
);
1614 xfrm_init_pmtu(dst_prev
);
1616 for (dst_prev
= dst0
; dst_prev
!= dst
; dst_prev
= dst_prev
->child
) {
1617 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst_prev
;
1619 err
= xfrm_fill_dst(xdst
, dev
, fl
);
1623 dst_prev
->header_len
= header_len
;
1624 dst_prev
->trailer_len
= trailer_len
;
1625 header_len
-= xdst
->u
.dst
.xfrm
->props
.header_len
;
1626 trailer_len
-= xdst
->u
.dst
.xfrm
->props
.trailer_len
;
1634 xfrm_state_put(xfrm
[i
]);
1638 dst0
= ERR_PTR(err
);
1642 #ifdef CONFIG_XFRM_SUB_POLICY
1643 static int xfrm_dst_alloc_copy(void **target
, const void *src
, int size
)
1646 *target
= kmalloc(size
, GFP_ATOMIC
);
1651 memcpy(*target
, src
, size
);
1656 static int xfrm_dst_update_parent(struct dst_entry
*dst
,
1657 const struct xfrm_selector
*sel
)
1659 #ifdef CONFIG_XFRM_SUB_POLICY
1660 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
1661 return xfrm_dst_alloc_copy((void **)&(xdst
->partner
),
1668 static int xfrm_dst_update_origin(struct dst_entry
*dst
,
1669 const struct flowi
*fl
)
1671 #ifdef CONFIG_XFRM_SUB_POLICY
1672 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
1673 return xfrm_dst_alloc_copy((void **)&(xdst
->origin
), fl
, sizeof(*fl
));
1679 static int xfrm_expand_policies(const struct flowi
*fl
, u16 family
,
1680 struct xfrm_policy
**pols
,
1681 int *num_pols
, int *num_xfrms
)
1685 if (*num_pols
== 0 || !pols
[0]) {
1690 if (IS_ERR(pols
[0]))
1691 return PTR_ERR(pols
[0]);
1693 *num_xfrms
= pols
[0]->xfrm_nr
;
1695 #ifdef CONFIG_XFRM_SUB_POLICY
1696 if (pols
[0] && pols
[0]->action
== XFRM_POLICY_ALLOW
&&
1697 pols
[0]->type
!= XFRM_POLICY_TYPE_MAIN
) {
1698 pols
[1] = xfrm_policy_lookup_bytype(xp_net(pols
[0]),
1699 XFRM_POLICY_TYPE_MAIN
,
1703 if (IS_ERR(pols
[1])) {
1704 xfrm_pols_put(pols
, *num_pols
);
1705 return PTR_ERR(pols
[1]);
1708 (*num_xfrms
) += pols
[1]->xfrm_nr
;
1712 for (i
= 0; i
< *num_pols
; i
++) {
1713 if (pols
[i
]->action
!= XFRM_POLICY_ALLOW
) {
1723 static struct xfrm_dst
*
1724 xfrm_resolve_and_create_bundle(struct xfrm_policy
**pols
, int num_pols
,
1725 const struct flowi
*fl
, u16 family
,
1726 struct dst_entry
*dst_orig
)
1728 struct net
*net
= xp_net(pols
[0]);
1729 struct xfrm_state
*xfrm
[XFRM_MAX_DEPTH
];
1730 struct dst_entry
*dst
;
1731 struct xfrm_dst
*xdst
;
1734 /* Try to instantiate a bundle */
1735 err
= xfrm_tmpl_resolve(pols
, num_pols
, fl
, xfrm
, family
);
1737 if (err
!= 0 && err
!= -EAGAIN
)
1738 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTPOLERROR
);
1739 return ERR_PTR(err
);
1742 dst
= xfrm_bundle_create(pols
[0], xfrm
, err
, fl
, dst_orig
);
1744 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTBUNDLEGENERROR
);
1745 return ERR_CAST(dst
);
1748 xdst
= (struct xfrm_dst
*)dst
;
1749 xdst
->num_xfrms
= err
;
1751 err
= xfrm_dst_update_parent(dst
, &pols
[1]->selector
);
1753 err
= xfrm_dst_update_origin(dst
, fl
);
1754 if (unlikely(err
)) {
1756 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTBUNDLECHECKERROR
);
1757 return ERR_PTR(err
);
1760 xdst
->num_pols
= num_pols
;
1761 memcpy(xdst
->pols
, pols
, sizeof(struct xfrm_policy
*) * num_pols
);
1762 xdst
->policy_genid
= atomic_read(&pols
[0]->genid
);
1767 static void xfrm_policy_queue_process(unsigned long arg
)
1770 struct sk_buff
*skb
;
1772 struct dst_entry
*dst
;
1773 struct xfrm_policy
*pol
= (struct xfrm_policy
*)arg
;
1774 struct xfrm_policy_queue
*pq
= &pol
->polq
;
1776 struct sk_buff_head list
;
1778 spin_lock(&pq
->hold_queue
.lock
);
1779 skb
= skb_peek(&pq
->hold_queue
);
1781 spin_unlock(&pq
->hold_queue
.lock
);
1786 xfrm_decode_session(skb
, &fl
, dst
->ops
->family
);
1787 spin_unlock(&pq
->hold_queue
.lock
);
1789 dst_hold(dst
->path
);
1790 dst
= xfrm_lookup(xp_net(pol
), dst
->path
, &fl
,
1795 if (dst
->flags
& DST_XFRM_QUEUE
) {
1798 if (pq
->timeout
>= XFRM_QUEUE_TMO_MAX
)
1801 pq
->timeout
= pq
->timeout
<< 1;
1802 if (!mod_timer(&pq
->hold_timer
, jiffies
+ pq
->timeout
))
1809 __skb_queue_head_init(&list
);
1811 spin_lock(&pq
->hold_queue
.lock
);
1813 skb_queue_splice_init(&pq
->hold_queue
, &list
);
1814 spin_unlock(&pq
->hold_queue
.lock
);
1816 while (!skb_queue_empty(&list
)) {
1817 skb
= __skb_dequeue(&list
);
1819 xfrm_decode_session(skb
, &fl
, skb_dst(skb
)->ops
->family
);
1820 dst_hold(skb_dst(skb
)->path
);
1821 dst
= xfrm_lookup(xp_net(pol
), skb_dst(skb
)->path
,
1830 skb_dst_set(skb
, dst
);
1832 err
= dst_output(skb
);
1841 xfrm_queue_purge(&pq
->hold_queue
);
1845 static int xdst_queue_output(struct sock
*sk
, struct sk_buff
*skb
)
1847 unsigned long sched_next
;
1848 struct dst_entry
*dst
= skb_dst(skb
);
1849 struct xfrm_dst
*xdst
= (struct xfrm_dst
*) dst
;
1850 struct xfrm_policy
*pol
= xdst
->pols
[0];
1851 struct xfrm_policy_queue
*pq
= &pol
->polq
;
1852 const struct sk_buff
*fclone
= skb
+ 1;
1854 if (unlikely(skb
->fclone
== SKB_FCLONE_ORIG
&&
1855 fclone
->fclone
== SKB_FCLONE_CLONE
)) {
1860 if (pq
->hold_queue
.qlen
> XFRM_MAX_QUEUE_LEN
) {
1867 spin_lock_bh(&pq
->hold_queue
.lock
);
1870 pq
->timeout
= XFRM_QUEUE_TMO_MIN
;
1872 sched_next
= jiffies
+ pq
->timeout
;
1874 if (del_timer(&pq
->hold_timer
)) {
1875 if (time_before(pq
->hold_timer
.expires
, sched_next
))
1876 sched_next
= pq
->hold_timer
.expires
;
1880 __skb_queue_tail(&pq
->hold_queue
, skb
);
1881 if (!mod_timer(&pq
->hold_timer
, sched_next
))
1884 spin_unlock_bh(&pq
->hold_queue
.lock
);
1889 static struct xfrm_dst
*xfrm_create_dummy_bundle(struct net
*net
,
1890 struct dst_entry
*dst
,
1891 const struct flowi
*fl
,
1896 struct net_device
*dev
;
1897 struct dst_entry
*dst1
;
1898 struct xfrm_dst
*xdst
;
1900 xdst
= xfrm_alloc_dst(net
, family
);
1904 if (net
->xfrm
.sysctl_larval_drop
|| num_xfrms
<= 0)
1907 dst1
= &xdst
->u
.dst
;
1911 dst_copy_metrics(dst1
, dst
);
1913 dst1
->obsolete
= DST_OBSOLETE_FORCE_CHK
;
1914 dst1
->flags
|= DST_HOST
| DST_XFRM_QUEUE
;
1915 dst1
->lastuse
= jiffies
;
1917 dst1
->input
= dst_discard
;
1918 dst1
->output
= xdst_queue_output
;
1924 xfrm_init_path((struct xfrm_dst
*)dst1
, dst
, 0);
1931 err
= xfrm_fill_dst(xdst
, dev
, fl
);
1940 xdst
= ERR_PTR(err
);
1944 static struct flow_cache_object
*
1945 xfrm_bundle_lookup(struct net
*net
, const struct flowi
*fl
, u16 family
, u8 dir
,
1946 struct flow_cache_object
*oldflo
, void *ctx
)
1948 struct dst_entry
*dst_orig
= (struct dst_entry
*)ctx
;
1949 struct xfrm_policy
*pols
[XFRM_POLICY_TYPE_MAX
];
1950 struct xfrm_dst
*xdst
, *new_xdst
;
1951 int num_pols
= 0, num_xfrms
= 0, i
, err
, pol_dead
;
1953 /* Check if the policies from old bundle are usable */
1956 xdst
= container_of(oldflo
, struct xfrm_dst
, flo
);
1957 num_pols
= xdst
->num_pols
;
1958 num_xfrms
= xdst
->num_xfrms
;
1960 for (i
= 0; i
< num_pols
; i
++) {
1961 pols
[i
] = xdst
->pols
[i
];
1962 pol_dead
|= pols
[i
]->walk
.dead
;
1965 dst_free(&xdst
->u
.dst
);
1973 /* Resolve policies to use if we couldn't get them from
1974 * previous cache entry */
1977 pols
[0] = __xfrm_policy_lookup(net
, fl
, family
,
1978 flow_to_policy_dir(dir
));
1979 err
= xfrm_expand_policies(fl
, family
, pols
,
1980 &num_pols
, &num_xfrms
);
1986 goto make_dummy_bundle
;
1989 new_xdst
= xfrm_resolve_and_create_bundle(pols
, num_pols
, fl
, family
, dst_orig
);
1990 if (IS_ERR(new_xdst
)) {
1991 err
= PTR_ERR(new_xdst
);
1995 goto make_dummy_bundle
;
1996 dst_hold(&xdst
->u
.dst
);
1998 } else if (new_xdst
== NULL
) {
2001 goto make_dummy_bundle
;
2002 xdst
->num_xfrms
= 0;
2003 dst_hold(&xdst
->u
.dst
);
2007 /* Kill the previous bundle */
2009 /* The policies were stolen for newly generated bundle */
2011 dst_free(&xdst
->u
.dst
);
2014 /* Flow cache does not have reference, it dst_free()'s,
2015 * but we do need to return one reference for original caller */
2016 dst_hold(&new_xdst
->u
.dst
);
2017 return &new_xdst
->flo
;
2020 /* We found policies, but there's no bundles to instantiate:
2021 * either because the policy blocks, has no transformations or
2022 * we could not build template (no xfrm_states).*/
2023 xdst
= xfrm_create_dummy_bundle(net
, dst_orig
, fl
, num_xfrms
, family
);
2025 xfrm_pols_put(pols
, num_pols
);
2026 return ERR_CAST(xdst
);
2028 xdst
->num_pols
= num_pols
;
2029 xdst
->num_xfrms
= num_xfrms
;
2030 memcpy(xdst
->pols
, pols
, sizeof(struct xfrm_policy
*) * num_pols
);
2032 dst_hold(&xdst
->u
.dst
);
2036 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTPOLERROR
);
2039 dst_free(&xdst
->u
.dst
);
2041 xfrm_pols_put(pols
, num_pols
);
2042 return ERR_PTR(err
);
2045 static struct dst_entry
*make_blackhole(struct net
*net
, u16 family
,
2046 struct dst_entry
*dst_orig
)
2048 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
2049 struct dst_entry
*ret
;
2052 dst_release(dst_orig
);
2053 return ERR_PTR(-EINVAL
);
2055 ret
= afinfo
->blackhole_route(net
, dst_orig
);
2057 xfrm_policy_put_afinfo(afinfo
);
2062 /* Main function: finds/creates a bundle for given flow.
2064 * At the moment we eat a raw IP route. Mostly to speed up lookups
2065 * on interfaces with disabled IPsec.
2067 struct dst_entry
*xfrm_lookup(struct net
*net
, struct dst_entry
*dst_orig
,
2068 const struct flowi
*fl
,
2069 struct sock
*sk
, int flags
)
2071 struct xfrm_policy
*pols
[XFRM_POLICY_TYPE_MAX
];
2072 struct flow_cache_object
*flo
;
2073 struct xfrm_dst
*xdst
;
2074 struct dst_entry
*dst
, *route
;
2075 u16 family
= dst_orig
->ops
->family
;
2076 u8 dir
= policy_to_flow_dir(XFRM_POLICY_OUT
);
2077 int i
, err
, num_pols
, num_xfrms
= 0, drop_pols
= 0;
2083 if (sk
&& sk
->sk_policy
[XFRM_POLICY_OUT
]) {
2085 pols
[0] = xfrm_sk_policy_lookup(sk
, XFRM_POLICY_OUT
, fl
);
2086 err
= xfrm_expand_policies(fl
, family
, pols
,
2087 &num_pols
, &num_xfrms
);
2092 if (num_xfrms
<= 0) {
2093 drop_pols
= num_pols
;
2097 xdst
= xfrm_resolve_and_create_bundle(
2101 xfrm_pols_put(pols
, num_pols
);
2102 err
= PTR_ERR(xdst
);
2104 } else if (xdst
== NULL
) {
2106 drop_pols
= num_pols
;
2110 route
= xdst
->route
;
2115 /* To accelerate a bit... */
2116 if ((dst_orig
->flags
& DST_NOXFRM
) ||
2117 !net
->xfrm
.policy_count
[XFRM_POLICY_OUT
])
2120 flo
= flow_cache_lookup(net
, fl
, family
, dir
,
2121 xfrm_bundle_lookup
, dst_orig
);
2128 xdst
= container_of(flo
, struct xfrm_dst
, flo
);
2130 num_pols
= xdst
->num_pols
;
2131 num_xfrms
= xdst
->num_xfrms
;
2132 memcpy(pols
, xdst
->pols
, sizeof(struct xfrm_policy
*) * num_pols
);
2133 route
= xdst
->route
;
2137 if (route
== NULL
&& num_xfrms
> 0) {
2138 /* The only case when xfrm_bundle_lookup() returns a
2139 * bundle with null route, is when the template could
2140 * not be resolved. It means policies are there, but
2141 * bundle could not be created, since we don't yet
2142 * have the xfrm_state's. We need to wait for KM to
2143 * negotiate new SA's or bail out with error.*/
2144 if (net
->xfrm
.sysctl_larval_drop
) {
2146 xfrm_pols_put(pols
, drop_pols
);
2147 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTNOSTATES
);
2149 return make_blackhole(net
, family
, dst_orig
);
2154 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTNOSTATES
);
2162 if ((flags
& XFRM_LOOKUP_ICMP
) &&
2163 !(pols
[0]->flags
& XFRM_POLICY_ICMP
)) {
2168 for (i
= 0; i
< num_pols
; i
++)
2169 pols
[i
]->curlft
.use_time
= get_seconds();
2171 if (num_xfrms
< 0) {
2172 /* Prohibit the flow */
2173 XFRM_INC_STATS(net
, LINUX_MIB_XFRMOUTPOLBLOCK
);
2176 } else if (num_xfrms
> 0) {
2177 /* Flow transformed */
2178 dst_release(dst_orig
);
2180 /* Flow passes untransformed */
2185 xfrm_pols_put(pols
, drop_pols
);
2186 if (dst
&& dst
->xfrm
&&
2187 dst
->xfrm
->props
.mode
== XFRM_MODE_TUNNEL
)
2188 dst
->flags
|= DST_XFRM_TUNNEL
;
2192 if (!(flags
& XFRM_LOOKUP_ICMP
)) {
2200 dst_release(dst_orig
);
2201 xfrm_pols_put(pols
, drop_pols
);
2202 return ERR_PTR(err
);
2204 EXPORT_SYMBOL(xfrm_lookup
);
2207 xfrm_secpath_reject(int idx
, struct sk_buff
*skb
, const struct flowi
*fl
)
2209 struct xfrm_state
*x
;
2211 if (!skb
->sp
|| idx
< 0 || idx
>= skb
->sp
->len
)
2213 x
= skb
->sp
->xvec
[idx
];
2214 if (!x
->type
->reject
)
2216 return x
->type
->reject(x
, skb
, fl
);
2219 /* When skb is transformed back to its "native" form, we have to
2220 * check policy restrictions. At the moment we make this in maximally
2221 * stupid way. Shame on me. :-) Of course, connected sockets must
2222 * have policy cached at them.
2226 xfrm_state_ok(const struct xfrm_tmpl
*tmpl
, const struct xfrm_state
*x
,
2227 unsigned short family
)
2229 if (xfrm_state_kern(x
))
2230 return tmpl
->optional
&& !xfrm_state_addr_cmp(tmpl
, x
, tmpl
->encap_family
);
2231 return x
->id
.proto
== tmpl
->id
.proto
&&
2232 (x
->id
.spi
== tmpl
->id
.spi
|| !tmpl
->id
.spi
) &&
2233 (x
->props
.reqid
== tmpl
->reqid
|| !tmpl
->reqid
) &&
2234 x
->props
.mode
== tmpl
->mode
&&
2235 (tmpl
->allalgs
|| (tmpl
->aalgos
& (1<<x
->props
.aalgo
)) ||
2236 !(xfrm_id_proto_match(tmpl
->id
.proto
, IPSEC_PROTO_ANY
))) &&
2237 !(x
->props
.mode
!= XFRM_MODE_TRANSPORT
&&
2238 xfrm_state_addr_cmp(tmpl
, x
, family
));
2242 * 0 or more than 0 is returned when validation is succeeded (either bypass
2243 * because of optional transport mode, or next index of the mathced secpath
2244 * state with the template.
2245 * -1 is returned when no matching template is found.
2246 * Otherwise "-2 - errored_index" is returned.
2249 xfrm_policy_ok(const struct xfrm_tmpl
*tmpl
, const struct sec_path
*sp
, int start
,
2250 unsigned short family
)
2254 if (tmpl
->optional
) {
2255 if (tmpl
->mode
== XFRM_MODE_TRANSPORT
)
2259 for (; idx
< sp
->len
; idx
++) {
2260 if (xfrm_state_ok(tmpl
, sp
->xvec
[idx
], family
))
2262 if (sp
->xvec
[idx
]->props
.mode
!= XFRM_MODE_TRANSPORT
) {
2271 int __xfrm_decode_session(struct sk_buff
*skb
, struct flowi
*fl
,
2272 unsigned int family
, int reverse
)
2274 struct xfrm_policy_afinfo
*afinfo
= xfrm_policy_get_afinfo(family
);
2277 if (unlikely(afinfo
== NULL
))
2278 return -EAFNOSUPPORT
;
2280 afinfo
->decode_session(skb
, fl
, reverse
);
2281 err
= security_xfrm_decode_session(skb
, &fl
->flowi_secid
);
2282 xfrm_policy_put_afinfo(afinfo
);
2285 EXPORT_SYMBOL(__xfrm_decode_session
);
2287 static inline int secpath_has_nontransport(const struct sec_path
*sp
, int k
, int *idxp
)
2289 for (; k
< sp
->len
; k
++) {
2290 if (sp
->xvec
[k
]->props
.mode
!= XFRM_MODE_TRANSPORT
) {
2299 int __xfrm_policy_check(struct sock
*sk
, int dir
, struct sk_buff
*skb
,
2300 unsigned short family
)
2302 struct net
*net
= dev_net(skb
->dev
);
2303 struct xfrm_policy
*pol
;
2304 struct xfrm_policy
*pols
[XFRM_POLICY_TYPE_MAX
];
2313 reverse
= dir
& ~XFRM_POLICY_MASK
;
2314 dir
&= XFRM_POLICY_MASK
;
2315 fl_dir
= policy_to_flow_dir(dir
);
2317 if (__xfrm_decode_session(skb
, &fl
, family
, reverse
) < 0) {
2318 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINHDRERROR
);
2322 nf_nat_decode_session(skb
, &fl
, family
);
2324 /* First, check used SA against their selectors. */
2328 for (i
= skb
->sp
->len
-1; i
>= 0; i
--) {
2329 struct xfrm_state
*x
= skb
->sp
->xvec
[i
];
2330 if (!xfrm_selector_match(&x
->sel
, &fl
, family
)) {
2331 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINSTATEMISMATCH
);
2338 if (sk
&& sk
->sk_policy
[dir
]) {
2339 pol
= xfrm_sk_policy_lookup(sk
, dir
, &fl
);
2341 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINPOLERROR
);
2347 struct flow_cache_object
*flo
;
2349 flo
= flow_cache_lookup(net
, &fl
, family
, fl_dir
,
2350 xfrm_policy_lookup
, NULL
);
2351 if (IS_ERR_OR_NULL(flo
))
2352 pol
= ERR_CAST(flo
);
2354 pol
= container_of(flo
, struct xfrm_policy
, flo
);
2358 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINPOLERROR
);
2363 if (skb
->sp
&& secpath_has_nontransport(skb
->sp
, 0, &xerr_idx
)) {
2364 xfrm_secpath_reject(xerr_idx
, skb
, &fl
);
2365 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINNOPOLS
);
2371 pol
->curlft
.use_time
= get_seconds();
2375 #ifdef CONFIG_XFRM_SUB_POLICY
2376 if (pols
[0]->type
!= XFRM_POLICY_TYPE_MAIN
) {
2377 pols
[1] = xfrm_policy_lookup_bytype(net
, XFRM_POLICY_TYPE_MAIN
,
2381 if (IS_ERR(pols
[1])) {
2382 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINPOLERROR
);
2385 pols
[1]->curlft
.use_time
= get_seconds();
2391 if (pol
->action
== XFRM_POLICY_ALLOW
) {
2392 struct sec_path
*sp
;
2393 static struct sec_path dummy
;
2394 struct xfrm_tmpl
*tp
[XFRM_MAX_DEPTH
];
2395 struct xfrm_tmpl
*stp
[XFRM_MAX_DEPTH
];
2396 struct xfrm_tmpl
**tpp
= tp
;
2400 if ((sp
= skb
->sp
) == NULL
)
2403 for (pi
= 0; pi
< npols
; pi
++) {
2404 if (pols
[pi
] != pol
&&
2405 pols
[pi
]->action
!= XFRM_POLICY_ALLOW
) {
2406 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINPOLBLOCK
);
2409 if (ti
+ pols
[pi
]->xfrm_nr
>= XFRM_MAX_DEPTH
) {
2410 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINBUFFERERROR
);
2413 for (i
= 0; i
< pols
[pi
]->xfrm_nr
; i
++)
2414 tpp
[ti
++] = &pols
[pi
]->xfrm_vec
[i
];
2418 xfrm_tmpl_sort(stp
, tpp
, xfrm_nr
, family
, net
);
2422 /* For each tunnel xfrm, find the first matching tmpl.
2423 * For each tmpl before that, find corresponding xfrm.
2424 * Order is _important_. Later we will implement
2425 * some barriers, but at the moment barriers
2426 * are implied between each two transformations.
2428 for (i
= xfrm_nr
-1, k
= 0; i
>= 0; i
--) {
2429 k
= xfrm_policy_ok(tpp
[i
], sp
, k
, family
);
2432 /* "-2 - errored_index" returned */
2434 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINTMPLMISMATCH
);
2439 if (secpath_has_nontransport(sp
, k
, &xerr_idx
)) {
2440 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINTMPLMISMATCH
);
2444 xfrm_pols_put(pols
, npols
);
2447 XFRM_INC_STATS(net
, LINUX_MIB_XFRMINPOLBLOCK
);
2450 xfrm_secpath_reject(xerr_idx
, skb
, &fl
);
2452 xfrm_pols_put(pols
, npols
);
2455 EXPORT_SYMBOL(__xfrm_policy_check
);
2457 int __xfrm_route_forward(struct sk_buff
*skb
, unsigned short family
)
2459 struct net
*net
= dev_net(skb
->dev
);
2461 struct dst_entry
*dst
;
2464 if (xfrm_decode_session(skb
, &fl
, family
) < 0) {
2465 XFRM_INC_STATS(net
, LINUX_MIB_XFRMFWDHDRERROR
);
2471 dst
= xfrm_lookup(net
, skb_dst(skb
), &fl
, NULL
, 0);
2476 skb_dst_set(skb
, dst
);
2479 EXPORT_SYMBOL(__xfrm_route_forward
);
2481 /* Optimize later using cookies and generation ids. */
2483 static struct dst_entry
*xfrm_dst_check(struct dst_entry
*dst
, u32 cookie
)
2485 /* Code (such as __xfrm4_bundle_create()) sets dst->obsolete
2486 * to DST_OBSOLETE_FORCE_CHK to force all XFRM destinations to
2487 * get validated by dst_ops->check on every use. We do this
2488 * because when a normal route referenced by an XFRM dst is
2489 * obsoleted we do not go looking around for all parent
2490 * referencing XFRM dsts so that we can invalidate them. It
2491 * is just too much work. Instead we make the checks here on
2492 * every use. For example:
2494 * XFRM dst A --> IPv4 dst X
2496 * X is the "xdst->route" of A (X is also the "dst->path" of A
2497 * in this example). If X is marked obsolete, "A" will not
2498 * notice. That's what we are validating here via the
2499 * stale_bundle() check.
2501 * When a policy's bundle is pruned, we dst_free() the XFRM
2502 * dst which causes it's ->obsolete field to be set to
2503 * DST_OBSOLETE_DEAD. If an XFRM dst has been pruned like
2504 * this, we want to force a new route lookup.
2506 if (dst
->obsolete
< 0 && !stale_bundle(dst
))
2512 static int stale_bundle(struct dst_entry
*dst
)
2514 return !xfrm_bundle_ok((struct xfrm_dst
*)dst
);
2517 void xfrm_dst_ifdown(struct dst_entry
*dst
, struct net_device
*dev
)
2519 while ((dst
= dst
->child
) && dst
->xfrm
&& dst
->dev
== dev
) {
2520 dst
->dev
= dev_net(dev
)->loopback_dev
;
2525 EXPORT_SYMBOL(xfrm_dst_ifdown
);
2527 static void xfrm_link_failure(struct sk_buff
*skb
)
2529 /* Impossible. Such dst must be popped before reaches point of failure. */
2532 static struct dst_entry
*xfrm_negative_advice(struct dst_entry
*dst
)
2535 if (dst
->obsolete
) {
2543 void xfrm_garbage_collect(struct net
*net
)
2545 flow_cache_flush(net
);
2547 EXPORT_SYMBOL(xfrm_garbage_collect
);
2549 static void xfrm_garbage_collect_deferred(struct net
*net
)
2551 flow_cache_flush_deferred(net
);
2554 static void xfrm_init_pmtu(struct dst_entry
*dst
)
2557 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
2558 u32 pmtu
, route_mtu_cached
;
2560 pmtu
= dst_mtu(dst
->child
);
2561 xdst
->child_mtu_cached
= pmtu
;
2563 pmtu
= xfrm_state_mtu(dst
->xfrm
, pmtu
);
2565 route_mtu_cached
= dst_mtu(xdst
->route
);
2566 xdst
->route_mtu_cached
= route_mtu_cached
;
2568 if (pmtu
> route_mtu_cached
)
2569 pmtu
= route_mtu_cached
;
2571 dst_metric_set(dst
, RTAX_MTU
, pmtu
);
2572 } while ((dst
= dst
->next
));
2575 /* Check that the bundle accepts the flow and its components are
2579 static int xfrm_bundle_ok(struct xfrm_dst
*first
)
2581 struct dst_entry
*dst
= &first
->u
.dst
;
2582 struct xfrm_dst
*last
;
2585 if (!dst_check(dst
->path
, ((struct xfrm_dst
*)dst
)->path_cookie
) ||
2586 (dst
->dev
&& !netif_running(dst
->dev
)))
2589 if (dst
->flags
& DST_XFRM_QUEUE
)
2595 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
2597 if (dst
->xfrm
->km
.state
!= XFRM_STATE_VALID
)
2599 if (xdst
->xfrm_genid
!= dst
->xfrm
->genid
)
2601 if (xdst
->num_pols
> 0 &&
2602 xdst
->policy_genid
!= atomic_read(&xdst
->pols
[0]->genid
))
2605 mtu
= dst_mtu(dst
->child
);
2606 if (xdst
->child_mtu_cached
!= mtu
) {
2608 xdst
->child_mtu_cached
= mtu
;
2611 if (!dst_check(xdst
->route
, xdst
->route_cookie
))
2613 mtu
= dst_mtu(xdst
->route
);
2614 if (xdst
->route_mtu_cached
!= mtu
) {
2616 xdst
->route_mtu_cached
= mtu
;
2620 } while (dst
->xfrm
);
2625 mtu
= last
->child_mtu_cached
;
2629 mtu
= xfrm_state_mtu(dst
->xfrm
, mtu
);
2630 if (mtu
> last
->route_mtu_cached
)
2631 mtu
= last
->route_mtu_cached
;
2632 dst_metric_set(dst
, RTAX_MTU
, mtu
);
2637 last
= (struct xfrm_dst
*)last
->u
.dst
.next
;
2638 last
->child_mtu_cached
= mtu
;
2644 static unsigned int xfrm_default_advmss(const struct dst_entry
*dst
)
2646 return dst_metric_advmss(dst
->path
);
2649 static unsigned int xfrm_mtu(const struct dst_entry
*dst
)
2651 unsigned int mtu
= dst_metric_raw(dst
, RTAX_MTU
);
2653 return mtu
? : dst_mtu(dst
->path
);
2656 static struct neighbour
*xfrm_neigh_lookup(const struct dst_entry
*dst
,
2657 struct sk_buff
*skb
,
2660 return dst
->path
->ops
->neigh_lookup(dst
, skb
, daddr
);
2663 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo
*afinfo
)
2667 if (unlikely(afinfo
== NULL
))
2669 if (unlikely(afinfo
->family
>= NPROTO
))
2670 return -EAFNOSUPPORT
;
2671 spin_lock(&xfrm_policy_afinfo_lock
);
2672 if (unlikely(xfrm_policy_afinfo
[afinfo
->family
] != NULL
))
2675 struct dst_ops
*dst_ops
= afinfo
->dst_ops
;
2676 if (likely(dst_ops
->kmem_cachep
== NULL
))
2677 dst_ops
->kmem_cachep
= xfrm_dst_cache
;
2678 if (likely(dst_ops
->check
== NULL
))
2679 dst_ops
->check
= xfrm_dst_check
;
2680 if (likely(dst_ops
->default_advmss
== NULL
))
2681 dst_ops
->default_advmss
= xfrm_default_advmss
;
2682 if (likely(dst_ops
->mtu
== NULL
))
2683 dst_ops
->mtu
= xfrm_mtu
;
2684 if (likely(dst_ops
->negative_advice
== NULL
))
2685 dst_ops
->negative_advice
= xfrm_negative_advice
;
2686 if (likely(dst_ops
->link_failure
== NULL
))
2687 dst_ops
->link_failure
= xfrm_link_failure
;
2688 if (likely(dst_ops
->neigh_lookup
== NULL
))
2689 dst_ops
->neigh_lookup
= xfrm_neigh_lookup
;
2690 if (likely(afinfo
->garbage_collect
== NULL
))
2691 afinfo
->garbage_collect
= xfrm_garbage_collect_deferred
;
2692 rcu_assign_pointer(xfrm_policy_afinfo
[afinfo
->family
], afinfo
);
2694 spin_unlock(&xfrm_policy_afinfo_lock
);
2698 struct dst_ops
*xfrm_dst_ops
;
2700 switch (afinfo
->family
) {
2702 xfrm_dst_ops
= &net
->xfrm
.xfrm4_dst_ops
;
2704 #if IS_ENABLED(CONFIG_IPV6)
2706 xfrm_dst_ops
= &net
->xfrm
.xfrm6_dst_ops
;
2712 *xfrm_dst_ops
= *afinfo
->dst_ops
;
2718 EXPORT_SYMBOL(xfrm_policy_register_afinfo
);
2720 int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo
*afinfo
)
2723 if (unlikely(afinfo
== NULL
))
2725 if (unlikely(afinfo
->family
>= NPROTO
))
2726 return -EAFNOSUPPORT
;
2727 spin_lock(&xfrm_policy_afinfo_lock
);
2728 if (likely(xfrm_policy_afinfo
[afinfo
->family
] != NULL
)) {
2729 if (unlikely(xfrm_policy_afinfo
[afinfo
->family
] != afinfo
))
2732 RCU_INIT_POINTER(xfrm_policy_afinfo
[afinfo
->family
],
2735 spin_unlock(&xfrm_policy_afinfo_lock
);
2737 struct dst_ops
*dst_ops
= afinfo
->dst_ops
;
2741 dst_ops
->kmem_cachep
= NULL
;
2742 dst_ops
->check
= NULL
;
2743 dst_ops
->negative_advice
= NULL
;
2744 dst_ops
->link_failure
= NULL
;
2745 afinfo
->garbage_collect
= NULL
;
2749 EXPORT_SYMBOL(xfrm_policy_unregister_afinfo
);
2751 static void __net_init
xfrm_dst_ops_init(struct net
*net
)
2753 struct xfrm_policy_afinfo
*afinfo
;
2756 afinfo
= rcu_dereference(xfrm_policy_afinfo
[AF_INET
]);
2758 net
->xfrm
.xfrm4_dst_ops
= *afinfo
->dst_ops
;
2759 #if IS_ENABLED(CONFIG_IPV6)
2760 afinfo
= rcu_dereference(xfrm_policy_afinfo
[AF_INET6
]);
2762 net
->xfrm
.xfrm6_dst_ops
= *afinfo
->dst_ops
;
2767 static int xfrm_dev_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
2769 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
2773 xfrm_garbage_collect(dev_net(dev
));
2778 static struct notifier_block xfrm_dev_notifier
= {
2779 .notifier_call
= xfrm_dev_event
,
2782 #ifdef CONFIG_XFRM_STATISTICS
2783 static int __net_init
xfrm_statistics_init(struct net
*net
)
2787 if (snmp_mib_init((void __percpu
**)net
->mib
.xfrm_statistics
,
2788 sizeof(struct linux_xfrm_mib
),
2789 __alignof__(struct linux_xfrm_mib
)) < 0)
2791 rv
= xfrm_proc_init(net
);
2793 snmp_mib_free((void __percpu
**)net
->mib
.xfrm_statistics
);
2797 static void xfrm_statistics_fini(struct net
*net
)
2799 xfrm_proc_fini(net
);
2800 snmp_mib_free((void __percpu
**)net
->mib
.xfrm_statistics
);
2803 static int __net_init
xfrm_statistics_init(struct net
*net
)
2808 static void xfrm_statistics_fini(struct net
*net
)
2813 static int __net_init
xfrm_policy_init(struct net
*net
)
2815 unsigned int hmask
, sz
;
2818 if (net_eq(net
, &init_net
))
2819 xfrm_dst_cache
= kmem_cache_create("xfrm_dst_cache",
2820 sizeof(struct xfrm_dst
),
2821 0, SLAB_HWCACHE_ALIGN
|SLAB_PANIC
,
2825 sz
= (hmask
+1) * sizeof(struct hlist_head
);
2827 net
->xfrm
.policy_byidx
= xfrm_hash_alloc(sz
);
2828 if (!net
->xfrm
.policy_byidx
)
2830 net
->xfrm
.policy_idx_hmask
= hmask
;
2832 for (dir
= 0; dir
< XFRM_POLICY_MAX
* 2; dir
++) {
2833 struct xfrm_policy_hash
*htab
;
2835 net
->xfrm
.policy_count
[dir
] = 0;
2836 INIT_HLIST_HEAD(&net
->xfrm
.policy_inexact
[dir
]);
2838 htab
= &net
->xfrm
.policy_bydst
[dir
];
2839 htab
->table
= xfrm_hash_alloc(sz
);
2842 htab
->hmask
= hmask
;
2845 INIT_LIST_HEAD(&net
->xfrm
.policy_all
);
2846 INIT_WORK(&net
->xfrm
.policy_hash_work
, xfrm_hash_resize
);
2847 if (net_eq(net
, &init_net
))
2848 register_netdevice_notifier(&xfrm_dev_notifier
);
2852 for (dir
--; dir
>= 0; dir
--) {
2853 struct xfrm_policy_hash
*htab
;
2855 htab
= &net
->xfrm
.policy_bydst
[dir
];
2856 xfrm_hash_free(htab
->table
, sz
);
2858 xfrm_hash_free(net
->xfrm
.policy_byidx
, sz
);
2863 static void xfrm_policy_fini(struct net
*net
)
2865 struct xfrm_audit audit_info
;
2869 flush_work(&net
->xfrm
.policy_hash_work
);
2870 #ifdef CONFIG_XFRM_SUB_POLICY
2871 audit_info
.loginuid
= INVALID_UID
;
2872 audit_info
.sessionid
= (unsigned int)-1;
2873 audit_info
.secid
= 0;
2874 xfrm_policy_flush(net
, XFRM_POLICY_TYPE_SUB
, &audit_info
);
2876 audit_info
.loginuid
= INVALID_UID
;
2877 audit_info
.sessionid
= (unsigned int)-1;
2878 audit_info
.secid
= 0;
2879 xfrm_policy_flush(net
, XFRM_POLICY_TYPE_MAIN
, &audit_info
);
2881 WARN_ON(!list_empty(&net
->xfrm
.policy_all
));
2883 for (dir
= 0; dir
< XFRM_POLICY_MAX
* 2; dir
++) {
2884 struct xfrm_policy_hash
*htab
;
2886 WARN_ON(!hlist_empty(&net
->xfrm
.policy_inexact
[dir
]));
2888 htab
= &net
->xfrm
.policy_bydst
[dir
];
2889 sz
= (htab
->hmask
+ 1) * sizeof(struct hlist_head
);
2890 WARN_ON(!hlist_empty(htab
->table
));
2891 xfrm_hash_free(htab
->table
, sz
);
2894 sz
= (net
->xfrm
.policy_idx_hmask
+ 1) * sizeof(struct hlist_head
);
2895 WARN_ON(!hlist_empty(net
->xfrm
.policy_byidx
));
2896 xfrm_hash_free(net
->xfrm
.policy_byidx
, sz
);
2899 static int __net_init
xfrm_net_init(struct net
*net
)
2903 rv
= xfrm_statistics_init(net
);
2905 goto out_statistics
;
2906 rv
= xfrm_state_init(net
);
2909 rv
= xfrm_policy_init(net
);
2912 xfrm_dst_ops_init(net
);
2913 rv
= xfrm_sysctl_init(net
);
2916 rv
= flow_cache_init(net
);
2920 /* Initialize the per-net locks here */
2921 spin_lock_init(&net
->xfrm
.xfrm_state_lock
);
2922 rwlock_init(&net
->xfrm
.xfrm_policy_lock
);
2923 mutex_init(&net
->xfrm
.xfrm_cfg_mutex
);
2928 xfrm_sysctl_fini(net
);
2930 xfrm_policy_fini(net
);
2932 xfrm_state_fini(net
);
2934 xfrm_statistics_fini(net
);
2939 static void __net_exit
xfrm_net_exit(struct net
*net
)
2941 flow_cache_fini(net
);
2942 xfrm_sysctl_fini(net
);
2943 xfrm_policy_fini(net
);
2944 xfrm_state_fini(net
);
2945 xfrm_statistics_fini(net
);
2948 static struct pernet_operations __net_initdata xfrm_net_ops
= {
2949 .init
= xfrm_net_init
,
2950 .exit
= xfrm_net_exit
,
2953 void __init
xfrm_init(void)
2955 register_pernet_subsys(&xfrm_net_ops
);
2959 #ifdef CONFIG_AUDITSYSCALL
2960 static void xfrm_audit_common_policyinfo(struct xfrm_policy
*xp
,
2961 struct audit_buffer
*audit_buf
)
2963 struct xfrm_sec_ctx
*ctx
= xp
->security
;
2964 struct xfrm_selector
*sel
= &xp
->selector
;
2967 audit_log_format(audit_buf
, " sec_alg=%u sec_doi=%u sec_obj=%s",
2968 ctx
->ctx_alg
, ctx
->ctx_doi
, ctx
->ctx_str
);
2970 switch (sel
->family
) {
2972 audit_log_format(audit_buf
, " src=%pI4", &sel
->saddr
.a4
);
2973 if (sel
->prefixlen_s
!= 32)
2974 audit_log_format(audit_buf
, " src_prefixlen=%d",
2976 audit_log_format(audit_buf
, " dst=%pI4", &sel
->daddr
.a4
);
2977 if (sel
->prefixlen_d
!= 32)
2978 audit_log_format(audit_buf
, " dst_prefixlen=%d",
2982 audit_log_format(audit_buf
, " src=%pI6", sel
->saddr
.a6
);
2983 if (sel
->prefixlen_s
!= 128)
2984 audit_log_format(audit_buf
, " src_prefixlen=%d",
2986 audit_log_format(audit_buf
, " dst=%pI6", sel
->daddr
.a6
);
2987 if (sel
->prefixlen_d
!= 128)
2988 audit_log_format(audit_buf
, " dst_prefixlen=%d",
2994 void xfrm_audit_policy_add(struct xfrm_policy
*xp
, int result
,
2995 kuid_t auid
, unsigned int sessionid
, u32 secid
)
2997 struct audit_buffer
*audit_buf
;
2999 audit_buf
= xfrm_audit_start("SPD-add");
3000 if (audit_buf
== NULL
)
3002 xfrm_audit_helper_usrinfo(auid
, sessionid
, secid
, audit_buf
);
3003 audit_log_format(audit_buf
, " res=%u", result
);
3004 xfrm_audit_common_policyinfo(xp
, audit_buf
);
3005 audit_log_end(audit_buf
);
3007 EXPORT_SYMBOL_GPL(xfrm_audit_policy_add
);
3009 void xfrm_audit_policy_delete(struct xfrm_policy
*xp
, int result
,
3010 kuid_t auid
, unsigned int sessionid
, u32 secid
)
3012 struct audit_buffer
*audit_buf
;
3014 audit_buf
= xfrm_audit_start("SPD-delete");
3015 if (audit_buf
== NULL
)
3017 xfrm_audit_helper_usrinfo(auid
, sessionid
, secid
, audit_buf
);
3018 audit_log_format(audit_buf
, " res=%u", result
);
3019 xfrm_audit_common_policyinfo(xp
, audit_buf
);
3020 audit_log_end(audit_buf
);
3022 EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete
);
3025 #ifdef CONFIG_XFRM_MIGRATE
3026 static bool xfrm_migrate_selector_match(const struct xfrm_selector
*sel_cmp
,
3027 const struct xfrm_selector
*sel_tgt
)
3029 if (sel_cmp
->proto
== IPSEC_ULPROTO_ANY
) {
3030 if (sel_tgt
->family
== sel_cmp
->family
&&
3031 xfrm_addr_equal(&sel_tgt
->daddr
, &sel_cmp
->daddr
,
3033 xfrm_addr_equal(&sel_tgt
->saddr
, &sel_cmp
->saddr
,
3035 sel_tgt
->prefixlen_d
== sel_cmp
->prefixlen_d
&&
3036 sel_tgt
->prefixlen_s
== sel_cmp
->prefixlen_s
) {
3040 if (memcmp(sel_tgt
, sel_cmp
, sizeof(*sel_tgt
)) == 0) {
3047 static struct xfrm_policy
*xfrm_migrate_policy_find(const struct xfrm_selector
*sel
,
3048 u8 dir
, u8 type
, struct net
*net
)
3050 struct xfrm_policy
*pol
, *ret
= NULL
;
3051 struct hlist_head
*chain
;
3054 read_lock_bh(&net
->xfrm
.xfrm_policy_lock
); /*FIXME*/
3055 chain
= policy_hash_direct(net
, &sel
->daddr
, &sel
->saddr
, sel
->family
, dir
);
3056 hlist_for_each_entry(pol
, chain
, bydst
) {
3057 if (xfrm_migrate_selector_match(sel
, &pol
->selector
) &&
3058 pol
->type
== type
) {
3060 priority
= ret
->priority
;
3064 chain
= &net
->xfrm
.policy_inexact
[dir
];
3065 hlist_for_each_entry(pol
, chain
, bydst
) {
3066 if (xfrm_migrate_selector_match(sel
, &pol
->selector
) &&
3067 pol
->type
== type
&&
3068 pol
->priority
< priority
) {
3077 read_unlock_bh(&net
->xfrm
.xfrm_policy_lock
);
3082 static int migrate_tmpl_match(const struct xfrm_migrate
*m
, const struct xfrm_tmpl
*t
)
3086 if (t
->mode
== m
->mode
&& t
->id
.proto
== m
->proto
&&
3087 (m
->reqid
== 0 || t
->reqid
== m
->reqid
)) {
3089 case XFRM_MODE_TUNNEL
:
3090 case XFRM_MODE_BEET
:
3091 if (xfrm_addr_equal(&t
->id
.daddr
, &m
->old_daddr
,
3093 xfrm_addr_equal(&t
->saddr
, &m
->old_saddr
,
3098 case XFRM_MODE_TRANSPORT
:
3099 /* in case of transport mode, template does not store
3100 any IP addresses, hence we just compare mode and
3111 /* update endpoint address(es) of template(s) */
3112 static int xfrm_policy_migrate(struct xfrm_policy
*pol
,
3113 struct xfrm_migrate
*m
, int num_migrate
)
3115 struct xfrm_migrate
*mp
;
3118 write_lock_bh(&pol
->lock
);
3119 if (unlikely(pol
->walk
.dead
)) {
3120 /* target policy has been deleted */
3121 write_unlock_bh(&pol
->lock
);
3125 for (i
= 0; i
< pol
->xfrm_nr
; i
++) {
3126 for (j
= 0, mp
= m
; j
< num_migrate
; j
++, mp
++) {
3127 if (!migrate_tmpl_match(mp
, &pol
->xfrm_vec
[i
]))
3130 if (pol
->xfrm_vec
[i
].mode
!= XFRM_MODE_TUNNEL
&&
3131 pol
->xfrm_vec
[i
].mode
!= XFRM_MODE_BEET
)
3133 /* update endpoints */
3134 memcpy(&pol
->xfrm_vec
[i
].id
.daddr
, &mp
->new_daddr
,
3135 sizeof(pol
->xfrm_vec
[i
].id
.daddr
));
3136 memcpy(&pol
->xfrm_vec
[i
].saddr
, &mp
->new_saddr
,
3137 sizeof(pol
->xfrm_vec
[i
].saddr
));
3138 pol
->xfrm_vec
[i
].encap_family
= mp
->new_family
;
3140 atomic_inc(&pol
->genid
);
3144 write_unlock_bh(&pol
->lock
);
3152 static int xfrm_migrate_check(const struct xfrm_migrate
*m
, int num_migrate
)
3156 if (num_migrate
< 1 || num_migrate
> XFRM_MAX_DEPTH
)
3159 for (i
= 0; i
< num_migrate
; i
++) {
3160 if (xfrm_addr_equal(&m
[i
].old_daddr
, &m
[i
].new_daddr
,
3162 xfrm_addr_equal(&m
[i
].old_saddr
, &m
[i
].new_saddr
,
3165 if (xfrm_addr_any(&m
[i
].new_daddr
, m
[i
].new_family
) ||
3166 xfrm_addr_any(&m
[i
].new_saddr
, m
[i
].new_family
))
3169 /* check if there is any duplicated entry */
3170 for (j
= i
+ 1; j
< num_migrate
; j
++) {
3171 if (!memcmp(&m
[i
].old_daddr
, &m
[j
].old_daddr
,
3172 sizeof(m
[i
].old_daddr
)) &&
3173 !memcmp(&m
[i
].old_saddr
, &m
[j
].old_saddr
,
3174 sizeof(m
[i
].old_saddr
)) &&
3175 m
[i
].proto
== m
[j
].proto
&&
3176 m
[i
].mode
== m
[j
].mode
&&
3177 m
[i
].reqid
== m
[j
].reqid
&&
3178 m
[i
].old_family
== m
[j
].old_family
)
3186 int xfrm_migrate(const struct xfrm_selector
*sel
, u8 dir
, u8 type
,
3187 struct xfrm_migrate
*m
, int num_migrate
,
3188 struct xfrm_kmaddress
*k
, struct net
*net
)
3190 int i
, err
, nx_cur
= 0, nx_new
= 0;
3191 struct xfrm_policy
*pol
= NULL
;
3192 struct xfrm_state
*x
, *xc
;
3193 struct xfrm_state
*x_cur
[XFRM_MAX_DEPTH
];
3194 struct xfrm_state
*x_new
[XFRM_MAX_DEPTH
];
3195 struct xfrm_migrate
*mp
;
3197 if ((err
= xfrm_migrate_check(m
, num_migrate
)) < 0)
3200 /* Stage 1 - find policy */
3201 if ((pol
= xfrm_migrate_policy_find(sel
, dir
, type
, net
)) == NULL
) {
3206 /* Stage 2 - find and update state(s) */
3207 for (i
= 0, mp
= m
; i
< num_migrate
; i
++, mp
++) {
3208 if ((x
= xfrm_migrate_state_find(mp
, net
))) {
3211 if ((xc
= xfrm_state_migrate(x
, mp
))) {
3221 /* Stage 3 - update policy */
3222 if ((err
= xfrm_policy_migrate(pol
, m
, num_migrate
)) < 0)
3225 /* Stage 4 - delete old state(s) */
3227 xfrm_states_put(x_cur
, nx_cur
);
3228 xfrm_states_delete(x_cur
, nx_cur
);
3231 /* Stage 5 - announce */
3232 km_migrate(sel
, dir
, type
, m
, num_migrate
, k
);
3244 xfrm_states_put(x_cur
, nx_cur
);
3246 xfrm_states_delete(x_new
, nx_new
);
3250 EXPORT_SYMBOL(xfrm_migrate
);