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Message-Id: <20190831044032.31931-1-leonardo@linux.ibm.com>
Date: Sat, 31 Aug 2019 01:40:33 -0300
From: Leonardo Bras <leonardo@...ux.ibm.com>
To: netfilter-devel@...r.kernel.org, coreteam@...filter.org,
bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Leonardo Bras <leonardo@...ux.ibm.com>,
Pablo Neira Ayuso <pablo@...filter.org>,
Jozsef Kadlecsik <kadlec@...filter.org>,
Florian Westphal <fw@...len.de>,
Roopa Prabhu <roopa@...ulusnetworks.com>,
Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH v5 1/1] net: br_netfiler_hooks: 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: Leonardo Bras <leonardo@...ux.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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