* internal/dhcp*: switch to github.com/mdlayher/packet
* internal/dhcp4d: update test constructor name to avoid packet conflict
Signed-off-by: Matt Layher <mdlayher@gmail.com>
Previously, a permanent error would not be persisted for future
invocations of ObtainOrRenew. In practice, the daemon immediately
exited, so this made no difference.
This fixes a race where dhcp4 started before netconfigd had a chance to change
the hardware address on the uplink0 interface.
fiber7’s port security feature may result in an about hour-long internet outage
without this commit.
All existing DHCPv4 packages I looked at were unappealing for one reason or
another, so we’re now using a little helper to glue github.com/google/gopacket
and github.com/mdlayher/raw together, which suffices for our use-case and gives
us more control.
