On Tue, Oct 15, 2013 at 10:01:31PM -0400, Vlad Yasevich wrote:
> 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>
> ---
> net/sctp/output.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sctp/output.c b/net/sctp/output.c
> index d35b54c..3191373 100644
> --- a/net/sctp/output.c
> +++ b/net/sctp/output.c
> @@ -537,7 +537,7 @@ 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
> --
> 1.8.3.1
>
> --
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>
Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
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