netdev - MCVLAN device do not honor smaller mtu than physical device

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-next>] [day] [month] [year] [list]

Message-ID: 
 <BN0PR19MB5310720D5344A0EBDFC66D9D9F36A@BN0PR19MB5310.namprd19.prod.outlook.com>
Date: Wed, 12 Jul 2023 09:06:20 +0000
From: "Zekri, Ishay" <Ishay.Zekri@...l.com>
To: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: "edumazet@...gle.com" <edumazet@...gle.com>,
        "Panina, Alexandra"
	<Alexandra.Panina@...l.com>,
        "Barcinski, Bartosz"
	<Bartosz.Barcinski@...l.com>
Subject: MCVLAN device do not honor smaller mtu than physical device

Hi,

We experiencing an issue in which MACVLAN MTU does not limit the frame size,
i.e. the limitation is coming from the physical device MTU.
Kernel version: 5.3.18

As described in the case below:
https://unix.stackexchange.com/questions/708638/macvlan-device-do-not-honor-smaller-mtu-than-physical-device 

it seems like this issue might have a fix.

If there was a known kernel issue that was fixed, I really apricate if you can provide to me the commit in which it was fixed.

Thanks,
Ishay.

Internal Use - Confidential