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| author |   Florian Westphal <fw@strlen.de> | 2022-04-25 15:15:41 +0200 |
|---|---|---|
| committer |   Pablo Neira Ayuso <pablo@netfilter.org> | 2022-05-13 18:56:28 +0200 |
| commit | 2794cdb0b97bfe62d25c996c8afe4832207e78bc (patch) | |
| tree | dacc9aa36a93afa497719bc7839977b68f127991 /drivers/net/loopback.c | |
| parent | netfilter: conntrack: add nf_ct_iter_data object for nf_ct_iterate_cleanup*() (diff) | |
| download | wireguard-linux-2794cdb0b97bfe62d25c996c8afe4832207e78bc.tar.xz wireguard-linux-2794cdb0b97bfe62d25c996c8afe4832207e78bc.zip | |
netfilter: nfnetlink: allow to detect if ctnetlink listeners exist
At this time, every new conntrack gets the 'event cache extension'
enabled for it.
This is because the 'net.netfilter.nf_conntrack_events' sysctl defaults
to 1.
Changing the default to 0 means that commands that rely on the event
notification extension, e.g. 'conntrack -E' or conntrackd, stop working.
We COULD detect if there is a listener by means of
'nfnetlink_has_listeners()' and only add the extension if this is true.
The downside is a dependency from conntrack module to nfnetlink module.
This adds a different way: inc/dec a counter whenever a ctnetlink group
is being (un)subscribed and toggle a flag in struct net.
Next patches will take advantage of this and will only add the event
extension if the flag is set.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'drivers/net/loopback.c')
0 files changed, 0 insertions, 0 deletions