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xfrm: avoid creating temporary SA when there are no listeners

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In the case when KMs have no listeners, km_query() will fail and
temporary SAs are garbage collected immediately after their allocation.
This causes strain on memory allocation, leading even to OOM since
temporary SA alloc/free cycle is performed for every packet
and garbage collection does not keep up the pace.

The sane thing to do is to make sure we have audience before
temporary SA allocation.

Signed-off-by: Horia Geanta <horia.geanta@freescale.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Horia Geanta
2014-02-12 16:20:06 +02:00
committed by Steffen Klassert
parent 5826bdd181
commit 0f24558e91
4 changed files with 71 additions and 0 deletions
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15
include/net/xfrm.h
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@@ -594,6 +594,7 @@ struct xfrm_mgr {
const struct xfrm_migrate *m,
int num_bundles,
const struct xfrm_kmaddress *k);
bool (*is_alive)(const struct km_event *c);
};
int xfrm_register_km(struct xfrm_mgr *km);
@@ -1646,6 +1647,20 @@ static inline int xfrm_aevent_is_on(struct net *net)
rcu_read_unlock();
return ret;
}
static inline int xfrm_acquire_is_on(struct net *net)
{
struct sock *nlsk;
int ret = 0;
rcu_read_lock();
nlsk = rcu_dereference(net->xfrm.nlsk);
if (nlsk)
ret = netlink_has_listeners(nlsk, XFRMNLGRP_ACQUIRE);
rcu_read_unlock();
return ret;
}
#endif
static inline int xfrm_alg_len(const struct xfrm_algo *alg)