Michael Lum wrote:
> Hello,
> 
> is there a fixed meaning of packet_info.p2p_dir for all protocols?
> 
> What is that value supposed to mean?

Well, I don't know if it's the same for all protocols, but it's usually 
set to one of these defines:

epan/packet_info.h:#define P2P_DIR_UNKNOWN      -1
epan/packet_info.h:#define P2P_DIR_SENT 0
epan/packet_info.h:#define P2P_DIR_RECV 1
epan/packet_info.h:#define P2P_DIR_UL   0
epan/packet_info.h:#define P2P_DIR_DL   1

It's useful in protocols when you know you're the sender or the receiver 
(and that makes a difference when dissecting).

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