linux-kernel - Re: [PATCH] af_packet: Handle outgoing VLAN packets without hardware offloading

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: Sat, 25 May 2024 22:55:59 +0200
From: alexandre.ferrieux@...nge.com
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>, Chengen Du
	<chengen.du@...onical.com>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] af_packet: Handle outgoing VLAN packets without hardware
 offloading

On 25/05/2024 17:51, Willem de Bruijn wrote:
> 
> First, we need to even understand better why anything is using
> SOCK_DGRAM when access to L2.5 headers is important, and whether the
> process can convert to using SOCK_RAW instead.

For libpcap, it seems to be linked to the fact that the "any" device can 
aggregate links with varied L2 header sizes, which in turn complicates filtering 
(see Guy Harris' comment on this [1]).

Given that 99% of useful traffic is Ethernet, such considerations look awkward 
now. I for one would love to see an "any2" based on SOCK_RAW. And while you're 
at it, please let the new variant of SLL contain the full Ethernet header at the 
end, so that a simple offset gives access to the whole linear wire image...

-Alex

[1] https://github.com/the-tcpdump-group/libpcap/issues/1105#issuecomment-1092221785
____________________________________________________________________________________________________________
Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.

This message and its attachments may contain confidential or privileged information that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and delete this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified.
Thank you.