netdev - Re: [PATCH iproute2-next 0/4] ip: Introduce and use helper to read /proc/net/dev

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Date:   Wed, 31 Jan 2018 15:04:44 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Serhey Popovych <serhe.popovych@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next 0/4] ip: Introduce and use helper to read
 /proc/net/dev

On Wed, 31 Jan 2018 21:49:45 +0200
Serhey Popovych <serhe.popovych@...il.com> wrote:

> Currently there is two places in ip(8) where /proc/net/dev is read line
> by line with nearly identical steps: iptunnel.c and ip6tunnel.c
> 
> On the other hand we have iptuntap.c that uses /sys/class/net that could
> be problematic in case of unshare(1)d network namespace without sysfs
> being mounted.
> 
> Introduce and use do_each_proc_net_dev() helper to read data from
> /proc/net/dev line by line and pass this information to implementation
> specific callback function.
> 
> See individual patch description message for more details.
> 
> Series is open for reviews and comments.
> 
> Tested only by compiling and executing ip [-46] [-s] [-d] tunnel in
> various combinations: no problem so far. More can be done by request.
> 
> Thanks,
> Serhii
> 
> Serhey Popovych (4):
>   utils: Introduce do_each_proc_net_dev() helper
>   iptunnel: Use do_each_proc_net_dev()
>   ip6tunnel: Use do_each_proc_net_dev()
>   tuntap: Use do_each_proc_net_dev()
> 
>  include/utils.h |   10 ++++++
>  ip/ip6tunnel.c  |   94 ++++++++++++++++++++------------------------------
>  ip/iptunnel.c   |  102 +++++++++++++++++++++++++------------------------------
>  ip/iptuntap.c   |   59 ++++++++++++++------------------
>  lib/utils.c     |   51 ++++++++++++++++++++++++++++
>  5 files changed, 170 insertions(+), 146 deletions(-)
> 

/proc/net/dev is legacy and unextensible.

I would rather see netlink used everywhere and not /proc/net/dev or sysfs!