netdev - Re: [RFC] packet: handle too big packets for 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 PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 15 Aug 2014 06:19:32 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Daniel Borkmann <dborkman@...hat.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [RFC] packet: handle too big packets for PACKET_V3

On Thu, Aug 14, 2014 at 05:56:20PM -0700, Eric Dumazet wrote:
> On Fri, 2014-08-15 at 02:50 +0200, Hannes Frederic Sowa wrote:
> 
> > 5) Or let a setsockopt control the NETIF_F_GRO bit of an interface if it
> > is bound to it? This will likely result in an implementation where we
> > must count current TPACKET_V3 sockets disabling GRO on an interface,
> > much like promisc counter.
> 
> loopback interface has MTU = 64K, it looks like the problem is not tied
> to GRO.
> 
Can we add a listener to the af packet code to resize the block length of the
socket based on the MTU?  

I realize that overloads user configuration, but if we warn them...

Neil
> 
> 
--
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