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net: Fix some corner cases in dev_can_checksum()

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dev_can_checksum() incorrectly returns true in these cases:

1. The skb has both out-of-band and in-band VLAN tags and the device
   supports checksum offload for the encapsulated protocol but only with
   one layer of encapsulation.
2. The skb has a VLAN tag and the device supports generic checksumming
   but not in conjunction with VLAN encapsulation.

Rearrange the VLAN tag checks to avoid these.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ben Hutchings 2010-10-22 04:12:19 +00:00 committed by David S. Miller
parent cd0ea24195
commit af1905dbec
1 changed files with 6 additions and 10 deletions
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16
net/core/dev.c
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@ -1696,22 +1696,18 @@ static bool can_checksum_protocol(unsigned long features, __be16 protocol)
static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
{
__be16 protocol = skb->protocol;
int features = dev->features;
if (vlan_tx_tag_present(skb))
if (vlan_tx_tag_present(skb)) {
features &= dev->vlan_features;
if (can_checksum_protocol(features, skb->protocol))
return true;
if (skb->protocol == htons(ETH_P_8021Q)) {
} else if (protocol == htons(ETH_P_8021Q)) {
struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
if (can_checksum_protocol(dev->features & dev->vlan_features,
veh->h_vlan_encapsulated_proto))
return true;
protocol = veh->h_vlan_encapsulated_proto;
features &= dev->vlan_features;
}
return false;
return can_checksum_protocol(features, protocol);
}
/**