ip: add MACsec support

Extend ip-link to create MACsec devices

  ip link add link <master> <macsec> type macsec [options]

Add `ip macsec` command to configure receive-side secure channels and
secure associations within a macsec netdevice.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: Phil Sutter <phil@nwl.cc>
7 files changed