[PW_SID:891940] [v2,1/2] netdev: external auth support

[IWDTestBot]

Certain FullMAC drivers do not expose CMD_ASSOCIATE/CMD_AUTHENTICATE,
but lack the ability to fully offload SAE connections to the firmware.
Such connections can still be supported on such firmware by using
CMD_EXTERNAL_AUTH & CMD_FRAME. The firmware sets the
NL80211_FEATURE_SAE bit (which implies support for CMD_AUTHENTICATE, but
oh well), and no other offload extended features.

When CMD_CONNECT is issued, the firmware sends CMD_EXTERNAL_AUTH via
unicast to the owner of the connection. The connection owner is then
expected to send SAE frames with the firmware using CMD_FRAME and
receive authenticate frames using unicast CMD_FRAME notifications as
well. Once SAE authentication completes, userspace is expected to
send a final CMD_EXTERNAL_AUTH back to the kernel with the corresponding
status code. On failure, a non-0 status code should be used.

Note that for historical reasons, SAE AKM sent in CMD_EXTERNAL_AUTH is
given in big endian order, not CPU order as is expected!

src/netdev.c | 255 +++++++++++++++++++++++++++++++++++++++++-----
src/nl80211util.c | 4 +-
src/wiphy.c | 19 ++--
3 files changed, 237 insertions(+), 41 deletions(-)

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