[Bridge] [PATCH] netfilter: Fix br_nf_pre_routing() in conjunction with bridge-nf-call-ip(6)tables=0

Richard Weinberger richard at nod.at
Tue Jan 3 20:29:01 UTC 2012

Am 03.01.2012 21:15, schrieb Bart De Schuymer:
> The documentation is probably not explicit enough, but I would keep the
> behavior as it is now. Setting bridge-nf-call-iptables to 0 makes
> iptables behave as if bridge-netfilter was not enabled at compilation.
> Anyway, your patch is almost certainly flawed since the fact that
> skb->nf_bridge can be NULL is used as part of the logic in
> br_netfilter.c: it indicates that bridge-nf-call-iptables was 0 when the
> packet was first processed by bridge-netfilter and should therefore not
> be given to iptables in any other netfilter hook.

Thanks for the explanation!

Wouldn't it make sense to check for bridge-nf-call-iptables in xt_physdev?
So that the user gets warned that his iptables rule will never match...


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