linux-kernel - [PATCH 3.11 36/66] sctp: Use software crc32 checksum when xfrm transform will happen.

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Message-Id: <20131101220644.658666093@linuxfoundation.org>
Date:	Fri,  1 Nov 2013 15:07:12 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Fan Du <fan.du@...driver.com>,
	Neil Horman <nhorman@...driver.com>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Vlad Yasevich <vyasevich@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.11 36/66] sctp: Use software crc32 checksum when xfrm transform will happen.

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

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

From: Fan Du <fan.du@...driver.com>

[ Upstream commit 27127a82561a2a3ed955ce207048e1b066a80a2a ]

igb/ixgbe have hardware sctp checksum support, when this feature is enabled
and also IPsec is armed to protect sctp traffic, ugly things happened as
xfrm_output checks CHECKSUM_PARTIAL to do checksum operation(sum every thing
up and pack the 16bits result in the checksum field). The result is fail
establishment of sctp communication.

Signed-off-by: Fan Du <fan.du@...driver.com>
Cc: Neil Horman <nhorman@...driver.com>
Cc: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Vlad Yasevich <vyasevich@...il.com>
Acked-by: Neil Horman <nhorman@...driver.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sctp/output.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -542,7 +542,8 @@ int sctp_packet_transmit(struct sctp_pac
 	 * by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>.
 	 */
 	if (!sctp_checksum_disable) {
-		if (!(dst->dev->features & NETIF_F_SCTP_CSUM)) {
+		if (!(dst->dev->features & NETIF_F_SCTP_CSUM) ||
+		    (dst_xfrm(dst) != NULL)) {
 			__u32 crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len);
 
 			/* 3) Put the resultant value into the checksum field in the


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