netdev - Re: [PATCH 0/2] net: Set maximum receive packet size on veth interfaces

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]

Message-Id: <20170509.134839.2008658486655854998.davem@davemloft.net>
Date:   Tue, 09 May 2017 13:48:39 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     fredrik.markstrom@...il.com
Cc:     eric.dumazet@...il.com, stephen@...workplumber.org, ast@...nel.org,
        daniel@...earbox.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bridge@...ts.linux-foundation.org
Subject: Re: [PATCH 0/2] net: Set maximum receive packet size on veth
 interfaces

From: Fredrik Markstrom <fredrik.markstrom@...il.com>
Date: Tue,  9 May 2017 14:44:36 +0200

> Currently veth drops all packets larger then the mtu set on the
> receiving end of the pair. This is inconsistent with most hardware
> ethernet drivers.

False.

In fact, many pieces of ethernet hardware a not physically capable of
sending even VLAN packets that are above the normal base ethernet MTU.

It is therefore untenable to remove this restriction univerally like
this.