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authorHoria Geanta <horia.geanta@freescale.com>2014-02-12 16:20:06 +0200
committerSteffen Klassert <steffen.klassert@secunet.com>2014-02-13 07:40:30 +0100
commit0f24558e91563888d51e9be5b70981da920c37ac (patch)
tree31aba2926b9f641fe30e235acc5a87b1b4dab73b /net/key
parent5826bdd1816fa2baa122b62e14905c0ad8e7b96a (diff)
xfrm: avoid creating temporary SA when there are no listeners
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>
Diffstat (limited to 'net/key')
-rw-r--r--net/key/af_key.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 1a04c1329362..e1c69d024197 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -3059,6 +3059,24 @@ static u32 get_acqseq(void)
return res;
}
+static bool pfkey_is_alive(const struct km_event *c)
+{
+ struct netns_pfkey *net_pfkey = net_generic(c->net, pfkey_net_id);
+ struct sock *sk;
+ bool is_alive = false;
+
+ rcu_read_lock();
+ sk_for_each_rcu(sk, &net_pfkey->table) {
+ if (pfkey_sk(sk)->registered) {
+ is_alive = true;
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ return is_alive;
+}
+
static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp)
{
struct sk_buff *skb;
@@ -3784,6 +3802,7 @@ static struct xfrm_mgr pfkeyv2_mgr =
.new_mapping = pfkey_send_new_mapping,
.notify_policy = pfkey_send_policy_notify,
.migrate = pfkey_send_migrate,
+ .is_alive = pfkey_is_alive,
};
static int __net_init pfkey_net_init(struct net *net)

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