path: root/net
diff options
authorVlad Yasevich <vyasevich@gmail.com>2013-10-15 22:01:31 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-04 04:31:04 -0800
commitc69ee66768490b30127bc496921a3603c9366a10 (patch)
tree3c4a07d56c703b8657b3d30a42c3d6abf622fd30 /net
parent935be1dc2cafe04f1421e236f75d17878920631b (diff)
sctp: Perform software checksum if packet has to be fragmented.
[ 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@windriver.com> Signed-off-by: Vlad Yasevich <vyasevich@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sctp/output.c b/net/sctp/output.c
index a1884399c04..0beb2f9c8a7 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -548,7 +548,7 @@ int sctp_packet_transmit(struct sctp_packet *packet)
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