netdev - Re: "wrong" ifindex on received VLAN tagged packet?

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] [day] [month] [year] [list]

Date:   Mon, 12 Mar 2018 13:26:15 -0700
From:   David Ahern <dsahern@...il.com>
To:     Lawrence Kreeger <lkreeger@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: "wrong" ifindex on received VLAN tagged packet?

On 3/6/18 5:27 PM, Lawrence Kreeger wrote:
> Using ETH_P_ALL instead of ETH_P_802_2, is causing mstpd to get 3
> copies of the same BPDU.  One from eth0, one from eth0.100, and
> another from vlan100 (the bridge).
> mstpd will drop the one from vlan100, but since there is also an
> instance of spanning tree running on the native VLAN, there is now no
> way to differentiate BPDUs coming in
> tagged vs untagged because they all show up with eth0.  So, there
> isn't some kernel knob to get the BPDUs to only come from eth0.100?

not that I am aware of. You could bind your socket or program to
eth0.100, but I suspect you actually have more than the one vlan
interface coming into the bridge that you want to snoop.