[3.8.y.z extended stable] Patch "sctp: Use software crc32 checksum when xfrm transform will happen." has been added to staging queue

Kamal Mostafa kamal at canonical.com
Fri Nov 1 21:43:42 UTC 2013


This is a note to let you know that I have just added a patch titled

    sctp: Use software crc32 checksum when xfrm transform will happen.

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.13.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 4eefb148defadc2ed4a325edd0209f790ae4e52c Mon Sep 17 00:00:00 2001
From: Fan Du <fan.du at windriver.com>
Date: Tue, 15 Oct 2013 22:01:30 -0400
Subject: sctp: Use software crc32 checksum when xfrm transform will happen.

[ 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.

Cc: Neil Horman <nhorman at tuxdriver.com>
Cc: Steffen Klassert <steffen.klassert at secunet.com>
Signed-off-by: Fan Du <fan.du at windriver.com>
Signed-off-by: Vlad Yasevich <vyasevich at gmail.com>
Acked-by: Neil Horman <nhorman at tuxdriver.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 net/sctp/output.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/sctp/output.c b/net/sctp/output.c
index f5200a2..0c04637 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -550,7 +550,8 @@ int sctp_packet_transmit(struct sctp_packet *packet)
 	 * 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
--
1.8.1.2





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