Cody Schuffelen <schuffelen@xxxxxxxxxx> writes: > This device takes over an existing network device and produces a > new one that appears like a wireless connection, returning enough canned > responses to nl80211 to satisfy a standard network manager. If > necessary, it can also be set up one step removed from an existing > network device, such as through a vlan/80211Q or macvlan connection to > not disrupt the existing network interface. > > To use it to wrap a bare ethernet connection: > > ip link set eth0 down > ip link set eth0 name buried_eth0 > ip link set buried_eth0 up > ip link add link buried_eth0 name wlan0 type virt_wifi > > eth0 is renamed to buried_eth0 to avoid a network manager trying to > manage it, as the original network link will become unusuable and only > the wireless wrapper will be functional. This can also be combined with > vlan or macvlan links on top of eth0 to share the network between > distinct links, but that requires support outside the machine for > accepting vlan-tagged packets or packets from multiple MAC addresses. > > This is being used for Google's Remote Android Virtual Device project, > which runs Android devices in virtual machines. The standard network > interfaces provided inside the virtual machines are all ethernet. > However, Android is not interested in ethernet devices and would rather > connect to a wireless interface. This patch allows the virtual machine > guest to treat one of its network connections as wireless rather than > ethernet, satisfying Android's network connection requirements. > > We believe this is a generally useful driver for simulating wireless > network connections in other environments where a wireless connection is > desired by some userspace process but is not available. Future work can > also include exporting the wireless control plane to userspace, so the > device can configure the behavior of the simulated wireless network > itself. > > This is distinct from other testing efforts such as mac80211_hwsim by > being a cfg80211 device instead of mac80211 device, allowing straight > pass-through on the data plane instead of forcing packaging of ethernet > data into mac80211 frames. > > Signed-off-by: A. Cody Schuffelen <schuffelen@xxxxxxxxxx> > Acked-by: Alistair Strachan <astrachan@xxxxxxxxxx> > Acked-by: Greg Hartman <ghartman@xxxxxxxxxx> > Signed-off-by: Cody Schuffelen <schuffelen@xxxxxxxxxx> > --- > Original change: https://lore.kernel.org/lkml/5b5b8e09.1c69fb81.c693c.0acd@xxxxxxxxxxxxx/ > First review: https://lore.kernel.org/lkml/1535460343.5895.56.camel@xxxxxxxxxxxxxxxx/ > > Thanks for the detailed review! I believe I've addressed all comments. BTW, this will likely go through mac80211-next, so don't add net-next to the subject to avoid Dave getting confused. But no need to resend because of this. -- Kalle Valo
