This is a note to let you know that I've just added the patch titled
sctp: Perform software checksum if packet has to be fragmented.
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sctp-perform-software-checksum-if-packet-has-to-be-fragmented.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9067790bb296fb5818894222d7e85407238e9843 Mon Sep 17 00:00:00 2001
From: Vlad Yasevich <vyasevich@xxxxxxxxx>
Date: Tue, 15 Oct 2013 22:01:31 -0400
Subject: sctp: Perform software checksum if packet has to be fragmented.
From: Vlad Yasevich <vyasevich@xxxxxxxxx>
[ Upstream commit d2dbbba77e95dff4b4f901fee236fef6d9552072 ]
IP/IPv6 fragmentation knows how to compute only TCP/UDP checksum.
This causes problems if SCTP packets has to be fragmented and
ipsummed has been set to PARTIAL due to checksum offload support.
This condition can happen when retransmitting after MTU discover,
or when INIT or other control chunks are larger then MTU.
Check for the rare fragmentation condition in SCTP and use software
checksum calculation in this case.
CC: Fan Du <fan.du@xxxxxxxxxxxxx>
Signed-off-by: Vlad Yasevich <vyasevich@xxxxxxxxx>
Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sctp/output.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -543,7 +543,7 @@ int sctp_packet_transmit(struct sctp_pac
*/
if (!sctp_checksum_disable) {
if (!(dst->dev->features & NETIF_F_SCTP_CSUM) ||
- (dst_xfrm(dst) != NULL)) {
+ (dst_xfrm(dst) != NULL) || packet->ipfragok) {
__u32 crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len);
/* 3) Put the resultant value into the checksum field in the
Patches currently in stable-queue which might be from vyasevich@xxxxxxxxx are
queue-3.11/net-dst-provide-accessor-function-to-dst-xfrm.patch
queue-3.11/sctp-use-software-crc32-checksum-when-xfrm-transform-will-happen.patch
queue-3.11/revert-bridge-only-expire-the-mdb-entry-when-query-is-received.patch
queue-3.11/sctp-perform-software-checksum-if-packet-has-to-be-fragmented.patch
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