[PATCH] Linux: Implement opensock using Netlink sockets

[Ben Hutchings]

On Mon, 2018-06-18 at 12:50 +0200, Florian Weimer wrote:
> inet/tst-inet6_scopeid_pton uses __opensock indirectly, to call ioctl
> with SIOCGIFINDEX, and it still works after this change.
> 
> 2018-06-18  Florian Weimer  <fweimer@redhat.com>
> 
> 	* sysdeps/unix/sysv/linux/opensock.c (__opensock): Unconditionally
> 	return a Netlink socket.
> 	* sysdeps/unix/sysv/linux/s390/opensock.c: Remove file.
[...]

I agree that we can assume the kernel implements AF_NETLINK, but the
available socket address families might be restricted by a security
policy (e.g. systemd's RestrictAddressFamilies property).  I'm not sure
whether it's safe to assume that they will always allow AF_NETLINK.

Ben.

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