PPP Accounting/Statistics Bugs

[hgn]

captcp is Ethernet centric. Some values like link layer overhead is always calculated with a Ethernet assumption. Since bb00a87 and PPP support this is not true.

There is no easy workaround because the API as based on a Ethernet assumption. Solution: shift packet data argument to packet and not packet.data and provide real link layer access. This needs modification to all modules!