netdev - [PATCH 8/9] netfilter: ctnetlink: reject new conntrack request with different l4proto

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Date:	Wed, 10 Aug 2016 21:16:44 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	netfilter-devel@...r.kernel.org
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 8/9] netfilter: ctnetlink: reject new conntrack request with different l4proto

From: Liping Zhang <liping.zhang@...eadtrum.com>

Currently, user can add a conntrack with different l4proto via nfnetlink.
For example, original tuple is TCP while reply tuple is SCTP. This is
invalid combination, we should report EINVAL to userspace.

Signed-off-by: Liping Zhang <liping.zhang@...eadtrum.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 net/netfilter/nf_conntrack_netlink.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index b9bfe64..fdfc71f 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1894,6 +1894,8 @@ static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
 
 			if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
 				return -EINVAL;
+			if (otuple.dst.protonum != rtuple.dst.protonum)
+				return -EINVAL;
 
 			ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
 							&rtuple, u3);
-- 
2.1.4