From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Ahern Subject: Re: [PATCH] iproute2: hide devices starting with period by default Date: Thu, 23 Feb 2017 18:07:07 -0700 Message-ID: <13cec1c2-88f4-e61d-02ee-dc01ccee7281@cumulusnetworks.com> References: <20170223195028.16388-1-stephen@networkplumber.org> <027775d1-ef98-deda-1f8d-bb058d1e4c2f@cumulusnetworks.com> <20170223163035.0a49f04d@xeon-e3> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: Stephen Hemminger Return-path: Received: from mail-pg0-f41.google.com ([74.125.83.41]:33548 "EHLO mail-pg0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751271AbdBXBHQ (ORCPT ); Thu, 23 Feb 2017 20:07:16 -0500 Received: by mail-pg0-f41.google.com with SMTP id z128so3613561pgb.0 for ; Thu, 23 Feb 2017 17:07:09 -0800 (PST) In-Reply-To: <20170223163035.0a49f04d@xeon-e3> Sender: netdev-owner@vger.kernel.org List-ID: On 2/23/17 5:30 PM, Stephen Hemminger wrote: > On Thu, 23 Feb 2017 16:39:52 -0700 > David Ahern wrote: > >> On 2/23/17 12:50 PM, Stephen Hemminger wrote: >>> Some use cases create Linux networking devices which are not intended for use >>> by normal networking. This is an enhancement to ip command to hide network >>> devices starting with period (like files in normal directory). Interfaces whose >>> name start with "." are not shown by default, and the -a (or -all) flag must >>> be used to show these devices. >> >> Agree that some devices need to be hidden by default -- not just from >> users but also other processes. >> >> This solution is very narrow, only affecting iproute2 users. Any other >> programs that use netlink or /proc files will continue to see those devices. > > I want solution that works broadly. And this works for sysfs already. for 'ls' maybe, but not general walking of /sys. It does not hide devices from snmpd, from ifconfig, etc., etc. >> I started a patch a year ago that allows devices to marked as invisible >> (attribute can be toggled at any time). Invisible devices do not show up >> in netlink dumps, proc files or notifications. Netlink dumps can request >> invisible devices to be included in a link dump. While it is more >> intrusive, it is also more complete covering all of the paths in which >> the device is shows up. >> >> Also, changing the default behavior for iproute2 could break existing >> users that have such device names. > > I am less worried about this. The only people using . in name already > are probably Brocade, and they have similar thing in CLI to hide these > devices. seems like a big assumption.