be printed, if the module were loaded into a kernel which had INET6 enabled.
The gre(4) driver does not use INET6, nor is it specified for IPv6. The
tunnel_status() function in ifconfig(8) is somewhat overzealous and assumes
that all tunnel interfaces speak KAME ifioctls.
This fix follows the path of least resistance, by teaching gre(4) about
the two KAME ifioctls concerned.
PR: bin/56341