tree 26e3f9e60da8b96e996355eeb76fef10f6615ac3
parent fb50d09dde36c0d9fcbb8b86e07648d625e15db9
author Charles Chan <rascov@gmail.com> 1492130632 -0700
committer Jonathan Hart <jono@onlab.us> 1492210379 +0000

Support IP deserialization when PACKET_IN carries Ethernet FCS

Some switches carry Ethernet FCS in the PACKET_IN.
In that case, Ethernet FCS should not be treated as IP payload.

payload length: the length specified in IP header
remaining length: the actual remaining bytes
    payload < remaining: padding or Ethernet FCS exists, use payload length
    payload = remaining: usual case, use either one
    payload > remaining: fragmented packets, use remaining length

In addition,
    - Fix unit test. TotalLen should never be smaller than headerLen * 4
    - Refactoring unit tests

Change-Id: I5d4736ad89ea2ab4ac3bd0cfaeb91da5d974db64