netdev - Re: LRO/GRO and libpcap packet reordering

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 for Android: free password hash cracker in your pocket

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

Date:	Fri, 15 Mar 2013 00:16:20 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: LRO/GRO and libpcap packet reordering

On Thu, 2013-03-14 at 15:58 -0700, Andy Lutomirski wrote:

> Right.  This is the part that I'm wondering about an efficient fix to
> (i.e. flush GRO state for one flow whenever a packet for the reversed
> flow is seen).

It doesnt seem doable easily, because network header and tcp headers are
handled in two separate functions in GRO stack (inet_gro_receive() &
tcp_gro_receive()

What you could do is changing MAX_GRO_SKBS from 8 to 1
(basically allowing only one flow in GRO stack)


--
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