netdev - Re: [PATCH iproute2-next v2 0/6] ip: Use netlink to walk through network device list

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Date:   Wed, 7 Feb 2018 17:20:38 -0700
From:   David Ahern <dsahern@...il.com>
To:     Serhey Popovych <serhe.popovych@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next v2 0/6] ip: Use netlink to walk through
 network device list

On 2/6/18 11:30 PM, Serhey Popovych wrote:
> In this seris I replace /proc/net/dev and /sys/class/net usage for walk
> through network device list in iptunnel/ip6tunnel and iptuntap with
> netlink dump.
> 
> Following changed since RFC was sent:
> 
>   1) Treat @struct rtnl_link_stats and @struct rtnl_link_stats64 as
>      array with __u32 and __u64 elements respectively in
>      copy_rtnl_link_stats64() as suggested by Stephen Hemminger.
> 
>   2) Remove @name and @size parameters from @struct tnl_print_nlmsg_info
>      since we can get them easily from other data.
> 
> Testing.
> ========
> 
> Following script is used to ensure I didn't broke things too much:
> 
> \#!/bin/bash
> 
> iproute2_dir="$1"
> iface='gre1'
> 
> pushd "$iproute2_dir" &>/dev/null
> 
> for i in new old; do
> 	DIR="/tmp/$i"
> 	mkdir -p "$DIR"
> 
> 	ln -snf ip.$i ip/ip
> 
> 	for o in '' -s -d; do
> 		ip/ip $o tunnel show           >"$DIR/ip${o}-tunnel-show"
> 		ip/ip -4 $o tunnel show        >"$DIR/ip-4${o}-tunnel-show"
> 		ip/ip -6 $o tunnel show        >"$DIR/ip-6${o}-tunnel-show"
> 		ip/ip $o tunnel show dev "$iface" \
> 			>"$DIR/ip${o}-tunnel-show-$iface"
> 		ip/ip $o tuntap show           >"$DIR/ip${o}-tuntap-show"
> 	done
> done
> rm -f ip/ip
> 
> diff -urN /tmp/{old,new} |sed -n -Ee'/^(-{3}|\+{3})[[:space:]]+/!p'
> rc=$?
> 
> popd &>/dev/null
> exit $rc
> 
> Results:
> ========
> 
> ...
> fopen /sys/class/net/ipip1/tun_flags: No such file or directory
> fopen /sys/class/net/ipip2/tun_flags: No such file or directory
> fopen /sys/class/net/gre10/tun_flags: No such file or directory
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> note that this comes from ip.old
> ...
> diff -urN /tmp/old/ip-d-tuntap-show /tmp/new/ip-d-tuntap-show
> @@ -1,4 +1,4 @@
> -tun1: tap user 1004 group 27
> -	Attached to processes:
>  tun0: tun user 1000 group 27
>  	Attached to processes:
> +tun1: tap user 1004 group 27
> +	Attached to processes:
> diff -urN /tmp/old/ip-s-tuntap-show /tmp/new/ip-s-tuntap-show
> @@ -1,2 +1,2 @@
> -tun1: tap user 1004 group 27
>  tun0: tun user 1000 group 27
> +tun1: tap user 1004 group 27
> diff -urN /tmp/old/ip-tuntap-show /tmp/new/ip-tuntap-show
> @@ -1,2 +1,2 @@
> -tun1: tap user 1004 group 27
>  tun0: tun user 1000 group 27
> +tun1: tap user 1004 group 27
> 
> So basically only print order for ip tuntap get changes. Rest is intact.
> 
> v2
>   Fix build failure in 0/4 patch ("iptunnel/ip6tunnel: Code cleanups")
>   and update it's description showing why this cleanup is necessary.
> 
>   Update cover letter to explain origins of fopen /sys/class/net/...
>   error message sources.
> 
> Thanks,
> Serhii
> 
> Serhey Popovych (6):
>   ipaddress: Unify print_link_stats() and print_link_stats64()
>   ip: Introduce get_rtnl_link_stats_rta() to get link statistics
>   tunnel: Split statistic getting and printing
>   iptunnel/ip6tunnel: Code cleanups
>   iptunnel/ip6tunnel: Use netlink to walk through tunnels list
>   tuntap: Use netlink to walk through tuntap list
> 
>  include/utils.h |    3 +
>  ip/ip6tunnel.c  |  115 +++++++++++----------------------
>  ip/ipaddress.c  |  189 ++++---------------------------------------------------
>  ip/iptunnel.c   |   93 +++++++++------------------
>  ip/iptuntap.c   |  121 ++++++++++++++++++++++++++---------
>  ip/tunnel.c     |  114 ++++++++++++++++++++++++++-------
>  ip/tunnel.h     |   17 ++++-
>  lib/utils.c     |   45 +++++++++++++
>  8 files changed, 324 insertions(+), 373 deletions(-)
> 

series applied to iproute2-next