lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Tue, 12 Feb 2019 15:03:40 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>
Cc:     Sasha Levin <sashal@...nel.org>, linux-sctp@...r.kernel.org
Subject: Re: [PATCH] inet_diag: fix reporting cgroup classid and fallback to
 priority



On 02/09/2019 02:35 AM, Konstantin Khlebnikov wrote:
> Field idiag_ext in struct inet_diag_req_v2 used as bitmap of requested
> extensions has only 8 bits. Thus extensions starting from DCTCPINFO
> cannot be requested directly. Some of them included into response
> unconditionally or hook into some of lower 8 bits.
> 
> Extension INET_DIAG_CLASS_ID has not way to request from the beginning.
> 
> This patch bundle it with INET_DIAG_TCLASS (ipv6 tos), fixes space
> reservation, and documents behavior for other extensions.
> 
> Also this patch adds fallback to reporting socket priority. This filed
> is more widely used for traffic classification because ipv4 sockets
> automatically maps TOS to priority and default qdisc pfifo_fast knows
> about that. But priority could be changed via setsockopt SO_PRIORITY so
> INET_DIAG_TOS isn't enough for predicting class.
> 
> Also cgroup2 obsoletes net_cls classid (it always zero), but we cannot
> reuse this field for reporting cgroup2 id because it is 64-bit (ino+gen).
> 
> So, after this patch INET_DIAG_CLASS_ID will report socket priority
> for most common setup when net_cls isn't set and/or cgroup2 in use.
>

Nice catch Konstantin

Are you planing sending an iproute2/ss patch to output NET_DIAG_CLASS_ID values then ?

Thanks.

Powered by blists - more mailing lists