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Commit 202863fe authored by Tom Herbert's avatar Tom Herbert Committed by David S. Miller
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sctp: Change sctp to implement csum_levels 



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: default avatarTom Herbert <therbert@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 662880f4

net/sctp/input.c

+6 −2
Original line number Original line Diff line number Diff line
@@ -133,9 +133,13 @@ int sctp_rcv(struct sk_buff *skb) 
	__skb_pull(skb, skb_transport_offset(skb));

	__skb_pull(skb, skb_transport_offset(skb));

	if (skb->len < sizeof(struct sctphdr))

	if (skb->len < sizeof(struct sctphdr))

		goto discard_it;

		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;

		goto discard_it;

	skb->csum_valid = 1;





	skb_pull(skb, sizeof(struct sctphdr));

	skb_pull(skb, sizeof(struct sctphdr));