network: check packets before further processing

When we receive a packet, we do not really check the contents. However,
we should at least do some basic checks.

- Check for short RTP packets
- Check if the length field of RTCP packets seems plausible
- Check if the packet type of RTCP packets makes sense (IANA)

Change-Id: Id47b9eee2164c542e6b673db24974859dd0a7618
Related: OS#3444
1 file changed