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Re: Windows 8 Mobile Broadband interface model interface types
From: Guy Harris <guy () alum mit edu>
Date: Sun, 28 Apr 2013 12:33:20 -0700


On Apr 28, 2013, at 12:13 PM, Guy Harris <guy () alum mit edu> wrote:

On Apr 28, 2013, at 8:32 AM, Evan Huus <eapache () gmail com> wrote:

... (this will likely involve adding a new linktype to the official list [2]).

Once that is done we can add a dissector to Wireshark for the framing
protocol,

...both of which will be necessary only if they do something different from the "add a fake Ethernet header with 
special Ethertypes for PPP packets" hack that they've done in the past for PPP; we already dissect that.

The spec given appears to talk only about low-level USB stuff, not about how it plugs into the networking stack, so the 
W8 changes probably would not require any changes in WinPcap.

The document on Windows *7* changes to mobile broadband:

        http://msdn.microsoft.com/en-us/library/windows/hardware/gg454521.aspx

*does* indicate that there's a new NDIS medium type, NdisMediumWirelessWan, and that the packets show up as raw IP 
frames.  There's already a link-layer type for raw IP, DLT_RAW, and we already have a dissector for it, so the only 
change needed to WinPcap would be:

        support for mapping NdisMediumWirelessWan to DLT_RAW;

        doing whatever's necessary to be able to see those devices in the first place;

and the latter is probably the biggest part.  I don't know whether the WinPcap NDIS driver would have to plug into the 
networking stack in a different fashion in order to make that work; it might have to.  That would be a very significant 
change.

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