netfilter: nf_conntrack: provide modparam to always register conntrack hooks

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The connection tracking hooks can be optionally registered per netns
when conntrack is specifically invoked from the ruleset since
0c66dc1ea3 ("netfilter: conntrack: register hooks in netns when needed
by ruleset"). Then, since 4d3a57f23d ("netfilter: conntrack: do not
enable connection tracking unless needed"), the default behaviour is
changed to always register them on demand.

This patch provides a toggle that allows users to always register them.
Without this toggle, in order to use conntrack for statistics
collection, you need a dummy rule that refers to conntrack, eg.

        iptables -I INPUT -m state --state NEW

This patch allows users to restore the original behaviour via modparam,
ie. always register connection tracking, eg.

        modprobe nf_conntrack enable_hooks=1

Hence, no dummy rule is required.

Reported-by: Laura Garcia <nevola@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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This commit is contained in:

Pablo Neira Ayuso 2019-01-16 18:24:17 +01:00

parent 4a60dc748d

commit ba3fbe6636

1 changed files with 24 additions and 4 deletions

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net/netfilter/nf_conntrack_standalone.c

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