linux-kernel - [PATCH 4.14 188/496] xfrm: Fix ESN sequence number handling for IPsec GSO packets.

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Date:   Mon, 28 May 2018 11:59:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 188/496] xfrm: Fix ESN sequence number handling for IPsec GSO packets.

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Steffen Klassert <steffen.klassert@...unet.com>

[ Upstream commit b8b549eec8187ac1b12075d69a2d84d89b5e811a ]

When IPsec offloading was introduced, we accidentally incremented
the sequence number counter on the xfrm_state by one packet
too much in the ESN case. This leads to a sequence number gap of
one packet after each GSO packet. Fix this by setting the sequence
number to the correct value.

Fixes: d7dbefc45cf5 ("xfrm: Add xfrm_replay_overflow functions for offloading")
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/xfrm/xfrm_replay.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/xfrm/xfrm_replay.c
+++ b/net/xfrm/xfrm_replay.c
@@ -658,7 +658,7 @@ static int xfrm_replay_overflow_offload_
 		} else {
 			XFRM_SKB_CB(skb)->seq.output.low = oseq + 1;
 			XFRM_SKB_CB(skb)->seq.output.hi = oseq_hi;
-			xo->seq.low = oseq = oseq + 1;
+			xo->seq.low = oseq + 1;
 			xo->seq.hi = oseq_hi;
 			oseq += skb_shinfo(skb)->gso_segs;
 		}