K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2021-12-13T00:30:16.432871Z
K 7
svn:log
V 761
add SIOCGIFDATA ioctl

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

(cherry picked from commit c1aedfcbd9896401f637bc815ba4e51dca107f6f)

Git Hash:   faa8d81cf7a25db3b7ea45acbef0cb28d80eefe0
Git Author: emaste@FreeBSD.org
END