Re: [Query] Decryption and Monitor Mode

On Wed, 2013-11-06 at 01:22 +0530, Krishna Chaitanya wrote:

> With this wireshark is not able to decode the packets, even thought
> they are decrypted. I propose 2 solutions

Well, you can say "ignore protected bit (with IV)" in the settings of
wireshark. But I agree that this is cumbersome, and previously floated
the idea of addings bits to radiotap to make this auto-detected.

> Radiotap and Wireshark:
> 
> 1) Add 2 flags to the radiotap RX Flags (HW Decrypted the packet,
> Packet has security Header (for some chipsets which consume the
> security header as well..??).)
> 
> Based on these the wireshark dissector decodes the packet accordingly.
> 
> mac80211:
> 
> 2) Remove the security header information in the monitor path as well
> based on the existing RX_FLAGS.
> 
> 
> Solutions 2 looks more elegant and simple, any comments?

Solution 2 drops information and makes the kernel code more expensive,
so I don't think we want that.

I think the radiotap bits would be better.

johannes