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authorTom Herbert <therbert@google.com>2014-06-10 18:54:19 -0700
committerDavid S. Miller <davem@davemloft.net>2014-06-11 15:46:13 -0700
commit7e3cead5172927732f51fde77fef6f521e22f209 (patch)
tree7b7cad61aa68ba302c395b9a1ea3dafb69881d0d /net/core
parent5d0c2b95bc57cf8fdc0e7b3e9d7e751eb65ad052 (diff)
net: Save software checksum complete
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>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/datagram.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/net/core/datagram.c b/net/core/datagram.c
index a16ed7bbe376..6b1c04ca1d50 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -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);