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netfilter: ctnetlink: don't add null bindings if no nat requested

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commit 0eba801b64 tried to fix a race
where nat initialisation can happen after ctnetlink-created conntrack
has been created.

However, it causes the nat module(s) to be loaded needlessly on
systems that are not using NAT.

Fortunately, we do not have to create null bindings in that case.

conntracks injected via ctnetlink always have the CONFIRMED bit set,
which prevents addition of the nat extension in nf_nat_ipv4/6_fn().

We only need to make sure that either no nat extension is added
or that we've created both src and dst manips.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2014-04-28 21:07:31 +02:00 committed by Pablo Neira Ayuso
parent 014f1b2010
commit fe337ac283
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/nf_conntrack_netlink.c
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@ -1336,6 +1336,9 @@ ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
#ifdef CONFIG_NF_NAT_NEEDED
int ret;
if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
return 0;
ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
cda[CTA_NAT_DST]);
if (ret < 0)