From: Leonardo Bras <leonardo@linux.ibm.com>
To: netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
bridge@lists.linux-foundation.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Leonardo Bras <leonardo@linux.ibm.com>,
Pablo Neira Ayuso <pablo@netfilter.org>,
Jozsef Kadlecsik <kadlec@netfilter.org>,
Florian Westphal <fw@strlen.de>,
Roopa Prabhu <roopa@cumulusnetworks.com>,
Nikolay Aleksandrov <nikolay@cumulusnetworks.com>,
"David S. Miller" <davem@davemloft.net>
Subject: [PATCH v4 2/2] net: br_netfiler_hooks: Drops IPv6 packets if IPv6 module is not loaded
Date: Fri, 30 Aug 2019 15:13:54 -0300 [thread overview]
Message-ID: <20190830181354.26279-3-leonardo@linux.ibm.com> (raw)
In-Reply-To: <20190830181354.26279-1-leonardo@linux.ibm.com>
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.
Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com>
---
net/bridge/br_netfilter_hooks.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c
index d3f9592f4ff8..5e8693730df1 100644
--- a/net/bridge/br_netfilter_hooks.c
+++ b/net/bridge/br_netfilter_hooks.c
@@ -493,6 +493,8 @@ static unsigned int br_nf_pre_routing(void *priv,
brnet = net_generic(state->net, brnf_net_id);
if (IS_IPV6(skb) || is_vlan_ipv6(skb, state->net) ||
is_pppoe_ipv6(skb, state->net)) {
+ if (!ipv6_mod_enabled())
+ return NF_DROP;
if (!brnet->call_ip6tables &&
!br_opt_get(br, BROPT_NF_CALL_IP6TABLES))
return NF_ACCEPT;
--
2.20.1
next prev parent reply other threads:[~2019-08-30 18:14 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-30 18:13 [PATCH v4 0/2] Drop IPV6 packets if IPv6 is disabled on boot Leonardo Bras
2019-08-30 18:13 ` [PATCH v4 1/2] netfilter: Terminate rule eval if protocol=IPv6 and ipv6 module is disabled Leonardo Bras
2019-08-30 20:58 ` Florian Westphal
2019-09-03 16:46 ` Leonardo Bras
2019-09-03 16:49 ` Pablo Neira Ayuso
2019-09-03 16:56 ` Leonardo Bras
2019-09-03 17:05 ` Florian Westphal
2019-09-03 19:31 ` Pablo Neira Ayuso
2019-09-03 19:48 ` Florian Westphal
2019-09-03 20:19 ` Pablo Neira Ayuso
2019-09-03 20:35 ` Florian Westphal
2019-09-03 20:55 ` Pablo Neira Ayuso
2019-09-03 20:55 ` Pablo Neira Ayuso
2019-08-30 18:13 ` Leonardo Bras [this message]
2019-08-30 20:55 ` [PATCH v4 2/2] net: br_netfiler_hooks: Drops IPv6 packets if IPv6 module is not loaded Florian Westphal
2019-08-31 4:42 ` Leonardo Bras
2019-08-31 8:43 ` Florian Westphal
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