[Bug 247588] Bluetooth HCI unprivileged socket has no LE access

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247588

            Bug ID: 247588
           Summary: Bluetooth HCI unprivileged socket has no LE access
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: greg at unrelenting.technology

Scanning for Bluetooth Low Energy (BLE) beacons currently requires root access,
which is ehhhh not great.

>From a quick look at the code, looks like setting some bits for allowing LE
commands/events was intended, but no bits are set:

https://github.com/freebsd/freebsd/blob/6266cce175c89b44f06d967f99d32f9a7d16f461/sys/netgraph/bluetooth/socket/ng_btsocket_hci_raw.c#L882-L883

OCF_LE_SET_SCAN_PARAMETERS and OCF_LE_SET_SCAN_ENABLE should definitely be
accessible.. and at least 0x3e (LE meta) events should be readable, I don't see
what in the code would block them but I haven't got them as non-root.

Also, maybe all of this should be controllable via sysctls.

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