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[NETFILTER]: ctnetlink: avoid unneccessary event message generation

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Avoid unneccessary event message generation by checking for netlink
listeners before building a message.

Signed-off-by: Patrick McHardy <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Patrick McHardy 2006-03-20 18:03:59 -08:00 • committed by David S. Miller
commit a242769248
4 changed files with 15 additions and 6 deletions
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7
net/ipv4/netfilter/ip_conntrack_netlink.c
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@ -327,9 +327,10 @@ static int ctnetlink_conntrack_event(struct notifier_block *this,
group = NFNLGRP_CONNTRACK_UPDATE;
} else
return NOTIFY_DONE;
/* FIXME: Check if there are any listeners before, don't hurt performance */
if (!nfnetlink_has_listeners(group))
return NOTIFY_DONE;
skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb)
return NOTIFY_DONE;