netdev - RE: rx_dropped count for USB ethernet 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] [day] [month] [year] [list]

Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B7362@saturn3.aculab.com>
Date:	Fri, 27 Sep 2013 09:39:00 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"David Miller" <davem@...hat.com>
Cc:	<netdev@...r.kernel.org>
Subject: RE: rx_dropped count for USB ethernet interfaces

> From: "David Laight" <David.Laight@...LAB.COM>
> Date: Thu, 26 Sep 2013 10:32:24 +0100
> 
> > It isn't exactly useful behaviour though.
> 
> In your opinion.
> 
> We have tracepoints for people who want more fine grained drops
> in these kinds of situations.
> 
> Also, the behavior of this statistic has existed for more than a
> decade so changing it is really not in the cards.  Therefore any
> discussion about what would have been the best samentic to choose from
> the beginning is moot.

I suspect that not many people have networks with broadcast packets
for non-IP protocols - so don't ever see rx_dropped being incremented
because there wasn't a protocol stack looking for the packet.

A similar problem will arise if promiscuous mode is enabled
by someone who only wants a specific protocol - eg a specific
ethertype or a single LLC SAP value.

	David



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html