Messages in this thread Patch in this message | | | From | Leonardo Bras <> | Subject | [PATCH v5 1/1] net: br_netfiler_hooks: Drops IPv6 packets if IPv6 module is not loaded | Date | Sat, 31 Aug 2019 01:40:33 -0300 |
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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> --- Changes from v4: - Check if the host ip6tables is going to be used before testing ipv6 module presence - Adds a warning about ipv6 module disabled.
net/bridge/br_netfilter_hooks.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c index d3f9592f4ff8..af7800103e51 100644 --- a/net/bridge/br_netfilter_hooks.c +++ b/net/bridge/br_netfilter_hooks.c @@ -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); -- 2.20.1
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