[Bug 273557] Regression preventing bhyve from running inside a jail without IP after f74147e26999838e03a522bf59ea33bef470d356) breaks support for jailing bhyve with IPv4 and IPv6 disabled. Patch included.

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 11 Oct 2023 18:45:16 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273557

Mark Johnston <markj@FreeBSD.org> changed:

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                 CC|                            |markj@FreeBSD.org

--- Comment #12 from Mark Johnston <markj@FreeBSD.org> ---
I think I agree with the proposed patch to use VMIO_SIOCSIFFLAGS.  Even if IP
is disabled on the jail, tap is an L2 device.  The fact that we have to use an
IP socket to configure the interface is bizarre; this overloading of sockets is
also problematic for capsicum.

OTOH, I think we can configure IFF_UP with any kind of socket, no?  We could
use a PF_ROUTE or PF_NETLINK socket instead.  I don't think netlink itself buys
us anything here, ifconfig still uses socket ioctls to set interface flags. 
One other reason to avoid VMIO_SIOCSIFFLAGS is that it's really just there for
vmnet(4) compatibility, I believe.

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