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[v2,net-next,4/9] sctp: Change sctp to implement csum_levels

Message ID alpine.DEB.2.02.1408272109250.32129@tomh.mtv.corp.google.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Tom Herbert Aug. 28, 2014, 4:27 a.m. UTC 
CHECKSUM_UNNECESSARY may be applied to the SCTP CRC so we need to
appropriate account for this by decrementing csum_level. This is
done by calling __skb_dec_checksum_unnecessary.

Signed-off-by: Tom Herbert <therbert@google.com>
---
 net/sctp/input.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/net/sctp/input.c b/net/sctp/input.c
index c1b9912..b6493b3 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -133,9 +133,13 @@  int sctp_rcv(struct sk_buff *skb)
 	__skb_pull(skb, skb_transport_offset(skb));
 	if (skb->len < sizeof(struct sctphdr))
 		goto discard_it;
-	if (!sctp_checksum_disable && !skb_csum_unnecessary(skb) &&
-		  sctp_rcv_checksum(net, skb) < 0)
+
+	skb->csum_valid = 0; /* Previous value not applicable */
+	if (skb_csum_unnecessary(skb))
+		__skb_decr_checksum_unnecessary(skb);
+	else if (!sctp_checksum_disable && sctp_rcv_checksum(net, skb) < 0)
 		goto discard_it;
+	skb->csum_valid = 1;
 
 	skb_pull(skb, sizeof(struct sctphdr));