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net/veth: Fix packet checksumming

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We can't change ip_summed from CHECKSUM_PARTIAL to CHECKSUM_NONE
or CHECKSUM_UNNECESSARY because checksum in packet's headers is
not valid and will cause invalid checksum when frame is forwarded.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michał Mirosław 2010-12-14 12:35:13 +00:00 committed by David S. Miller
parent 76d661586c
commit 0b7967503d
1 changed files with 3 additions and 1 deletions
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4
drivers/net/veth.c
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@ -166,7 +166,9 @@ static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
if (!(rcv->flags & IFF_UP))
goto tx_drop;
if (dev->features & NETIF_F_NO_CSUM)
/* don't change ip_summed == CHECKSUM_PARTIAL, as that
will cause bad checksum on forwarded packets */
if (skb->ip_summed == CHECKSUM_NONE)
skb->ip_summed = rcv_priv->ip_summed;
length = skb->len + ETH_HLEN;