Referential Implementation of the advanced API

kame/kame/kame/ping6
a practical example.
specifying
outgoing interface, source address, hop limit, routing header
receiving
arrived interface, destination address, hop limit, extension headers

kame/kame/kame/advapitest
just for testing or reference, but is a simple, comprehensive example.
based on rfc2292bis.
both TCP and UDP are supported.
specifying
hop limit and extension headers
receiving
arrived interface, destination address, hop limit, extension headers