* net/netdev/netdev_ioctl.c:
(netdev_ifr_ioctl): The ioctl SIOCGIFHWADDR provides the hardware
address (e.g., Ethernet MAC, etc.) of a network interface. It is
based on Linux. (BSD-based systems don't have this ioctl.) The Linux
implementation sets sa_family to ARPHRD_ETHER for Ethernet and IEEE
802.11 interfaces [1]. NuttX was setting it to NET_SOCK_FAMILY for
these interface types as well as 6LoWPAN and PKTRADIO; this was
incorrect and also the value of NET_SOCK_FAMILY varies based on
Kconfig settings. Correcting this to ARPHRD_ETHER for Ethernet and
IEEE 802.11 and ARPHRD_IEEE802154 for 6LoWPAN and PKTRADIO.
References:
[1] 'man 7 netdevice' on Linux.
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