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net: Save software checksum complete

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In skb_checksum complete, if we need to compute the checksum for the
packet (via skb_checksum) save the result as CHECKSUM_COMPLETE.
Subsequent checksum verification can use this.

Also, added csum_complete_sw flag to distinguish between software and
hardware generated checksum complete, we should always be able to trust
the software computation.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
2014-06-10 18:54:19 -07:00
committed by David S. Miller
parent 5d0c2b95bc
commit 7e3cead517
4 changed files with 17 additions and 9 deletions
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14
net/core/datagram.c
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@@ -739,11 +739,15 @@ __sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len)
__sum16 sum;
sum = csum_fold(skb_checksum(skb, 0, len, skb->csum));
if (likely(!sum)) {
if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE))
netdev_rx_csum_fault(skb->dev);
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) && !sum &&
!skb->csum_complete_sw)
netdev_rx_csum_fault(skb->dev);
/* Save checksum complete for later use */
skb->csum = sum;
skb->ip_summed = CHECKSUM_COMPLETE;
skb->csum_complete_sw = 1;
return sum;
}
EXPORT_SYMBOL(__skb_checksum_complete_head);