netdev - [PATCH 2/2] netfilter: nf_ct_h323: fix bug in rtcp natting

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Message-Id: <1339522563-9227-3-git-send-email-pablo@netfilter.org>
Date:	Tue, 12 Jun 2012 19:36:03 +0200
From:	pablo@...filter.org
To:	netfilter-devel@...r.kernel.org
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 2/2] netfilter: nf_ct_h323: fix bug in rtcp natting

From: Pablo Neira Ayuso <pablo@...filter.org>

The nat_rtp_rtcp hook takes two separate parameters port and rtp_port.

port is expected to be the real h245 address (found inside the packet).
rtp_port is the even number closest to port (RTP ports are even and
RTCP ports are odd).

However currently, both port and rtp_port are having same value (both are
rounded to nearest even numbers).

This works well in case of openlogicalchannel with media (RTP/even) port.

But in case of openlogicalchannel for media control (RTCP/odd) port,
h245 address in the packet is wrongly modified to have an even port.

I am attaching a pcap demonstrating the problem, for any further analysis.

This behavior was introduced around v2.6.19 while rewriting the helper.

Signed-off-by: Jagdish Motwani <jagdish.motwani@...tecore.com>
Signed-off-by: Sanket Shah <sanket.shah@...tecore.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 net/netfilter/nf_conntrack_h323_main.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c
index 46d69d7..31f50bc 100644
--- a/net/netfilter/nf_conntrack_h323_main.c
+++ b/net/netfilter/nf_conntrack_h323_main.c
@@ -270,9 +270,8 @@ static int expect_rtp_rtcp(struct sk_buff *skb, struct nf_conn *ct,
 		return 0;

 	/* RTP port is even */
-	port &= htons(~1);
-	rtp_port = port;
-	rtcp_port = htons(ntohs(port) + 1);
+	rtp_port = port & ~htons(1);
+	rtcp_port = port | htons(1);

 	/* Create expect for RTP */
 	if ((rtp_exp = nf_ct_expect_alloc(ct)) == NULL)
-- 
1.7.10

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