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netfilter: bridge: Drops IPv6 packets if IPv6 module is not loaded

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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: Leonardo Bras <leonardo@linux.ibm.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Leonardo Bras 2019-08-31 01:40:33 -03:00 committed by Pablo Neira Ayuso
parent e33b4325e6
commit 48bd0d68cd
1 changed files with 4 additions and 0 deletions
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4
net/bridge/br_netfilter_hooks.c
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@ -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);