This commit adds support for parsing SCTP packets and converting them
to strings. Currently only chunks, parameters and error causes specified
in RFC 4960 are supported. Support for other RFCs will be added in the
future.
Tested on FreeBSD (amd64 and arm) and Linux.

Signed-off-by: Michael Tuexen <tuexen@fh-muenster.de>

This commit adds support for UDPLite as specified in RFC 3828
and the corresponding socket options.
It is tested on FreeBSD 10.1 and Linux, the platforms supporting
UDPLite.

Signed-off-by: Michael Tuexen <tuexen@fh-muenster.de>

Basic definitions for reading and writing MPLS label stacks.

Change-Id: I4190b816082fe57a6cbececfee368aabeab57daa

As a first step for packetdrill supporting encapsulated packets,
introduce types to represent all the layers of headers in a packet.


Change-Id: I617a6b977d4fc1f6a51b1b0211dc2c3b39cc2738