From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: [PATCH] iproute2: hide devices starting with period by default Date: Thu, 23 Feb 2017 17:31:14 -0800 Message-ID: <20170223173114.621cb747@xeon-e3> References: <20170223195028.16388-1-stephen@networkplumber.org> <027775d1-ef98-deda-1f8d-bb058d1e4c2f@cumulusnetworks.com> <20170223163035.0a49f04d@xeon-e3> <13cec1c2-88f4-e61d-02ee-dc01ccee7281@cumulusnetworks.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org To: David Ahern Return-path: Received: from mail-pg0-f44.google.com ([74.125.83.44]:34273 "EHLO mail-pg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751559AbdBXBhm (ORCPT ); Thu, 23 Feb 2017 20:37:42 -0500 Received: by mail-pg0-f44.google.com with SMTP id 1so3942173pgi.1 for ; Thu, 23 Feb 2017 17:37:42 -0800 (PST) In-Reply-To: <13cec1c2-88f4-e61d-02ee-dc01ccee7281@cumulusnetworks.com> Sender: netdev-owner@vger.kernel.org List-ID: On Thu, 23 Feb 2017 18:07:07 -0700 David Ahern wrote: > 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. Need a solution now, not something that requires kernel and command changes.