linux-kernel - [PATCH 5.9 23/46] inet_ecn: Fix endianness of checksum update when setting ECT(1)

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Date:   Sun,  6 Dec 2020 12:17:31 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jonathan Morton <chromatix99@...il.com>,
        Pete Heist <pete@...stp.net>,
        Toke HÃ¸iland-JÃ¸rgensen <toke@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 5.9 23/46] inet_ecn: Fix endianness of checksum update when setting ECT(1)

From: "Toke Høiland-Jørgensen" <toke@...hat.com>

[ Upstream commit 2867e1eac61016f59b3d730e3f7aa488e186e917 ]

When adding support for propagating ECT(1) marking in IP headers it seems I
suffered from endianness-confusion in the checksum update calculation: In
fact the ECN field is in the *lower* bits of the first 16-bit word of the
IP header when calculating in network byte order. This means that the
addition performed to update the checksum field was wrong; let's fix that.

Fixes: b723748750ec ("tunnel: Propagate ECT(1) when decapsulating as recommended by RFC6040")
Reported-by: Jonathan Morton <chromatix99@...il.com>
Tested-by: Pete Heist <pete@...stp.net>
Signed-off-by: Toke HÃ¸iland-JÃ¸rgensen <toke@...hat.com>
Link: https://lore.kernel.org/r/20201130183705.17540-1-toke@redhat.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/net/inet_ecn.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/net/inet_ecn.h
+++ b/include/net/inet_ecn.h
@@ -107,7 +107,7 @@ static inline int IP_ECN_set_ect1(struct
 	if ((iph->tos & INET_ECN_MASK) != INET_ECN_ECT_0)
 		return 0;
 
-	check += (__force u16)htons(0x100);
+	check += (__force u16)htons(0x1);
 
 	iph->check = (__force __sum16)(check + (check>=0xFFFF));
 	iph->tos ^= INET_ECN_MASK;