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Commit 48bd0d68 authored by Leonardo Bras's avatar Leonardo Bras Committed by Pablo Neira Ayuso
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netfilter: bridge: Drops IPv6 packets if IPv6 module is not loaded 



A kernel panic can happen if a host has disabled IPv6 on boot and have to
process guest packets (coming from a bridge) using it's ip6tables.

IPv6 packets need to be dropped if the IPv6 module is not loaded, and the
host ip6tables will be used.

Signed-off-by: default avatarLeonardo Bras <leonardo@linux.ibm.com>
Acked-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent e33b4325

net/bridge/br_netfilter_hooks.c

+4 −0
Original line number Diff line number Diff line
@@ -496,6 +496,10 @@ static unsigned int br_nf_pre_routing(void *priv, 
		if (!brnet->call_ip6tables &&

		    !br_opt_get(br, BROPT_NF_CALL_IP6TABLES))

			return NF_ACCEPT;

		if (!ipv6_mod_enabled()) {

			pr_warn_once("Module ipv6 is disabled, so call_ip6tables is not supported.");

			return NF_DROP;

		}



		nf_bridge_pull_encap_header_rcsum(skb);

		return br_nf_pre_routing_ipv6(priv, skb, state);