Re: Patches for wlan filtering

[Guy Harris <guy () alum mit edu>]

Gianluca Varenni wrote:

> Theoretically, PPI supports multiple linktypes, so we should generate 
> code for some(all?) link types. However at the moment PPI is used only 
> for 802.11 packets with AirPcap, so when I patched the BPF compiler I 
> decided to implement support for DLT_IEEE802_11 over PPI 
> (DLT_IEEE802_11_RADIO is radiotap), and have the compiler discard any 
> packet whose PPI-linktype is not DLT_IEEE802_11.

I've checked into the main and 1.0 branches a change that puts the 
per-packet DLT test for DLT_PPI at the beginning of the program.
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