From: Hannes Frederic Sowa <hannes@stressinduktion.org>
To: Tom Herbert <tom@herbertland.com>, David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org, netfilter-devel@vger.kernel.org,
pablo@netfilter.org, "Jiří Pírko" <jiri@resnulli.us>
Subject: Re: [PATCH 0/4] Prevent UDP tunnels from operating on garbage socket
Date: Tue, 07 Apr 2015 13:27:33 +0200 [thread overview]
Message-ID: <1428406053.3932555.250169221.75848497@webmail.messagingengine.com> (raw)
In-Reply-To: <CALx6S36f8SQQoNvzPyCNk4=0LbH4Od6ZtdDn0DCA2sZGZHMx2g@mail.gmail.com>
On Tue, Apr 7, 2015, at 06:45, Tom Herbert wrote:
> On Mon, Apr 6, 2015 at 8:51 PM, David Miller <davem@davemloft.net> wrote:
> > I don't see what is convoluted about using the correct socket for
> > sending L3 protocol frames. That's in fact how it's _supposed_ to
> > work. And consistently having a proper matching socket available
> > makes it so that, long-term, we'll never have to deal with this issue
> > ever again.
>
> I guess this is where I'm confused. We can send just about anything
> over GRE also, but have never needed a transmit socket for that. Is
> UDP encapsulation so different, or is GRE equally broken also? Also,
> will we need to add the socket to FOU and GUE then?
GRE, FOU, GUE in case of sk_mc_loop and the destination is a multicast
address, we imply sk_mc_loop() == true, what is not what we want. Tunnel
sockets deliberately set mc_loop to false but we cannot adhere to them,
yet. David's patchset changes that.
Also, I saw one inconsistency with sk_bound_dev_if in netfilter which
doesn't get solved by this patchset (it uses skb->sk->sk_bound_dev_if
unconditionally).
I think that having a struct-sock carrying over meta-information is a
good thing.
Thanks,
Hannes
next prev parent reply other threads:[~2015-04-07 11:27 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-06 2:18 [PATCH 0/4] Prevent UDP tunnels from operating on garbage socket David Miller
2015-04-06 13:59 ` Tom Herbert
2015-04-06 16:41 ` David Miller
2015-04-06 17:17 ` David Miller
[not found] ` <CALx6S34CvOZN3dZjXr6_1afCbUDu2718cCGPk2Sm1Nkq8wCGKA@mail.gmail.com>
2015-04-06 19:38 ` David Miller
2015-04-07 2:43 ` Tom Herbert
2015-04-07 3:51 ` David Miller
2015-04-07 4:45 ` Tom Herbert
2015-04-07 5:03 ` Eric Dumazet
2015-04-07 8:20 ` Wilco Baan Hofman
2015-04-07 5:29 ` David Miller
2015-04-07 11:27 ` Hannes Frederic Sowa [this message]
2015-04-08 20:03 ` David Miller
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