netdev - Re: [PATCHv3] ipv6: Enable enough of the code to handle GSO when disabled.

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:	Wed, 17 Oct 2012 18:13:17 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Vlad Yasevich <vyasevic@...hat.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCHv3] ipv6: Enable enough of the code to handle GSO when
 disabled.

On Wed, 2012-10-17 at 11:46 -0400, Vlad Yasevich wrote:

> This patch attempts to solve this by enabling just enough code so GSO
> is correctly processed.  However, I should point out that if IPv6 is
> simply blacklisted or not built for the kernel, this problem will
> still persist.

So I guess this should be done in a different way ?

We currently use a single structure (struct packet_type) to hold 
pointers to different methods. (The .func() field, and the gso/gro
stuff)

We probably need to split it in two parts, and make one part linked into
kernel, even if CONFIG_IPV6=n, so that GRO/GSO is fully IPv4/IPv6
functional.

By the way, do we really need a hash table for this ?
It seems we only have IPv4 (ETH_P_IP) and IPv6 (ETH_P_IPV6) to take care
of ?

This would remove some tests we currently have in GRO stack, and some
RCU stuff as well.
(GRO is slower if we have many af_packet sockets)

list_for_each_entry_rcu(ptype, head, list) {
    if (ptype->type != type || ptype->dev || !ptype->gro_receive)
        continue;
...

Adding a hook/test in ipv6_rcv() is ugly.

--
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