sockets: ensure we don't accept IPv4 clients when IPv4 is disabled
Currently if you disable listening on IPv4 addresses, via the CLI flag ipv4=off, we still mistakenly accept IPv4 clients via the IPv6 listener socket due to IPV6_V6ONLY flag being unset. We must ensure IPV6_V6ONLY is always set if ipv4=off This fixes the following scenarios -incoming tcp::9000,ipv6=on -incoming tcp:[::]:9000,ipv6=on -chardev socket,id=cdev0,host=,port=9000,server,nowait,ipv4=off -chardev socket,id=cdev0,host=,port=9000,server,nowait,ipv6=on -chardev socket,id=cdev0,host=::,port=9000,server,nowait,ipv4=off -chardev socket,id=cdev0,host=::,port=9000,server,nowait,ipv6=on which all mistakenly accepted IPv4 clients Acked-by: NGerd Hoffmann <kraxel@gmail.com> Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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