net/veth: Fix packet checksumming

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>

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 0bbc0c3..cc83fa7 100644 (file)
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -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;