Wireshark · Wireshark-dev: Re: [Wireshark-dev] how to access lower level packet information

[Guy Harris <guy@xxxxxxxxxxxx>]

Motonori Shindo wrote:

> Is there any way for a dissector to access the information that has
> already been dissected by lower level dissector?

If the dissector supplies that information, yes.

> For example, suppose
> I'm writing a dissector for a certain protocol atop UDP and I need the
> source IP address of the packet. How would I get such information in
> the dissector I'm writing?

pinfo->net_src would contain that address - the type field would be 
AT_IPv4 or AT_IPv6 for UDP over IP.