From 90d1daa45849f272b701f29d6ca88b24743c7553 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Mon, 25 Apr 2022 15:15:43 +0200 Subject: netfilter: conntrack: add nf_conntrack_events autodetect mode This adds the new nf_conntrack_events=2 mode and makes it the default. This leverages the earlier flag in struct net to allow to avoid the event extension as long as no event listener is active in the namespace. This avoids, for most cases, allocation of ct->ext area. A followup patch will take further advantage of this by avoiding calls down into the event framework if the extension isn't present. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- Documentation/networking/nf_conntrack-sysctl.rst | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'Documentation/networking') diff --git a/Documentation/networking/nf_conntrack-sysctl.rst b/Documentation/networking/nf_conntrack-sysctl.rst index 311128abb768..834945ebc4cd 100644 --- a/Documentation/networking/nf_conntrack-sysctl.rst +++ b/Documentation/networking/nf_conntrack-sysctl.rst @@ -34,10 +34,13 @@ nf_conntrack_count - INTEGER (read-only) nf_conntrack_events - BOOLEAN - 0 - disabled - - not 0 - enabled (default) + - 1 - enabled + - 2 - auto (default) If this option is enabled, the connection tracking code will provide userspace with connection tracking events via ctnetlink. + The default allocates the extension if a userspace program is + listening to ctnetlink events. nf_conntrack_expect_max - INTEGER Maximum size of expectation table. Default value is -- cgit v1.2.3