Add bridge mode networking#709
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Early RFC. See also apple/container#1463 |
Adds BridgedNetworkInterface, which uses VZBridgedNetworkDeviceAttachment to place a container on the host's physical network. The IP address is assigned by the upstream DHCP server rather than our allocation pool, so ipv4Address is always nil for this type. Makes Interface.ipv4Address optional (CIDRv4?) to accommodate interfaces whose address is not known at configuration time. Updates all existing conformers (NATInterface, NATNetworkInterface, VmnetNetwork.Interface) and guards the static address/route setup in LinuxContainer and LinuxPod behind an ipv4Address nil-check. Fixes apple#457
When configureDns is called with an empty nameservers list or no domain, read /proc/net/pnp (written by the kernel IP_PNP DHCP client) and use any nameserver and domain lines found there. The two are filled in independently, so an explicit nameserver does not prevent the domain from being read from pnp. This provides automatic DNS configuration for bridge-mode containers without a new RPC or proto change.
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Fixes #457