The function __vlan_put_tag modifies adds a VLAN tag to an existing
Ethernet packet. In the process, the front of the packet is extended
by four bytes to accommodate the tag. This function correctly
adjusts the mac_header offset, but I think this line is problematic:
skb->network_header -= VLAN_HLEN;
When access to the network header is needed, the value of skb-
>network_header is added to skb->head, which should not have changed
during any of the previous modifications. I believe the code as it
exists now will cause the network header to appear to be four bytes
earlier than it actually is.
--Justin
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