[Click] Accessing the ingress interface of a packet

[Eddie Kohler]

Hi Philip,

I read the rest of this thread but just to respond to the top level 
question.

Elements don't really "RETURN" anything.  They are parts of a 
packet-oriented dataflow.

The ingress interface of a packet is accessible from within C++, 
however.  For the full interface to Packet:

http://read.cs.ucla.edu/click/doxygen/classPacket.html

You want Packet::device_anno().

Eddie


On 1/1/11 12:26 PM, Philip Prindeville wrote:
> (Forgive the newbie questions... I'm having to learn Click in a hurry as I ramp up on a project.)
>
> Is there a built-in element that returns the ingress interface of a packet?
>
> I'm trying to write an elementclass in Click that modifies a packet and then sends it back out the same interface it came in on, but don't want to have one instance of it per-interface that it is used on.
>
> Thanks.
>
> -Philip
>
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