From d2dbbba77e95dff4b4f901fee236fef6d9552072 Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Tue, 15 Oct 2013 22:01:31 -0400 Subject: [PATCH] sctp: Perform software checksum if packet has to be fragmented. 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 Signed-off-by: Vlad Yasevich Acked-by: Neil Horman Signed-off-by: David S. Miller --- 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 d35b54cb3020..319137340d15 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 -- 2.20.1