linux-kernel - [PATCH 3.2 166/199] tcp: fix wrong checksum calculation on MTU probing

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Message-ID: <lsq.1489146370.647842058@decadent.org.uk>
Date:   Fri, 10 Mar 2017 11:46:10 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Douglas Caetano dos Santos" <douglascs@...hos.com.br>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.2 166/199] tcp: fix wrong checksum calculation on MTU
 probing

3.2.87-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Douglas Caetano dos Santos <douglascs@...hos.com.br>

[ Upstream commit 2fe664f1fcf7c4da6891f95708a7a56d3c024354 ]

With TCP MTU probing enabled and offload TX checksumming disabled,
tcp_mtu_probe() calculated the wrong checksum when a fragment being copied
into the probe's SKB had an odd length. This was caused by the direct use
of skb_copy_and_csum_bits() to calculate the checksum, as it pads the
fragment being copied, if needed. When this fragment was not the last, a
subsequent call used the previous checksum without considering this
padding.

The effect was a stale connection in one way, as even retransmissions
wouldn't solve the problem, because the checksum was never recalculated for
the full SKB length.

Signed-off-by: Douglas Caetano dos Santos <douglascs@...hos.com.br>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/ipv4/tcp_output.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1680,12 +1680,14 @@ static int tcp_mtu_probe(struct sock *sk
 	len = 0;
 	tcp_for_write_queue_from_safe(skb, next, sk) {
 		copy = min_t(int, skb->len, probe_size - len);
-		if (nskb->ip_summed)
+		if (nskb->ip_summed) {
 			skb_copy_bits(skb, 0, skb_put(nskb, copy), copy);
-		else
-			nskb->csum = skb_copy_and_csum_bits(skb, 0,
-							    skb_put(nskb, copy),
-							    copy, nskb->csum);
+		} else {
+			__wsum csum = skb_copy_and_csum_bits(skb, 0,
+							     skb_put(nskb, copy),
+							     copy, 0);
+			nskb->csum = csum_block_add(nskb->csum, csum, len);
+		}

 		if (skb->len <= copy) {
 			/* We've eaten all the data from this skb.