As a default implementation is already provided by
NetworkStack, stub implementations in the child classes
are not required. Furthermore, they return unsupported for
all cases instead of redirecting to the non-control API,
which is plainly wrong.
This patch contains improvements mentioned in the unresolved PR
comments:
- function names were changed from socket_sendmsg/socket_recvmsg to
socket_sendto_control/socket_recvfrom_control.
- default implementation of this functions was provided in the
NetworkStack class.
- MsgHeaderIterator accesses elements on the aligned addresses.
Add license identifier to files which Arm owns the copyright to,
and contain either BSD-3 or Apache-2.0 licenses. This is to address
license errors raised by scancode analysis.