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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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6
net/xfrm/xfrm_user.c
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@@ -2982,6 +2982,11 @@ static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
return nlmsg_multicast(net->xfrm.nlsk, skb, 0, XFRMNLGRP_MAPPING, GFP_ATOMIC);
}
static bool xfrm_is_alive(const struct km_event *c)
{
return (bool)xfrm_acquire_is_on(c->net);
}
static struct xfrm_mgr netlink_mgr = {
.id = "netlink",
.notify = xfrm_send_state_notify,
@@ -2991,6 +2996,7 @@ static struct xfrm_mgr netlink_mgr = {
.report = xfrm_send_report,
.migrate = xfrm_send_migrate,
.new_mapping = xfrm_send_mapping,
.is_alive = xfrm_is_alive,
};
static int __net_init xfrm_user_net_init(struct net *net)