For IP allocation schemes that cannot be interface agnostic, the
ipvlan plugin can be chained with an earlier plugin that handles this
logic. If "master" is omitted from the ipvlan configuration, then the
previous Result must contain a single interface name for the ipvlan
plugin to enslave. If "ipam" is omitted, then the previous Result is
used to configure the ipvlan interface.
For IP allocation schemes that cannot be interface agnostic, master can be set
to "ipam". In this configuration, the IPAM plugin is required to return a single
interface name for the ipvlan plugin to enslave.
Updates the spec and plugins to return an array of interfaces and IP details
to the runtime including:
- interface names and MAC addresses configured by the plugin
- whether the interfaces are sandboxed (container/VM) or host (bridge, veth, etc)
- multiple IP addresses configured by IPAM and which interface they
have been assigned to
Returning interface details is useful for runtimes, as well as allowing
more flexible chaining of CNI plugins themselves. For example, some
meta plugins may need to know the host-side interface to be able to
apply firewall or traffic shaping rules to the container.
