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For interfaces that do not support SIOCGIFMEDIA (for which there are quite a few) the only fallback is to query the interface for if_data->ifi_link_state. While it's possible to get at if_data for an interface via getifaddrs(3) or sysctl, both are heavy weight mechanisms. SIOCGIFDATA is a simple ioctl to retrieve this fast with very little resource use in comparison. This implementation mirrors that of other similar ioctls in FreeBSD. Submitted by: Roy Marples <roy@marples.name> Reviewed by: markj MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D26538