From: bert hubert <ahu@ds9a.nl>
To: Lennert Buytenhek <buytenh@gnu.org>
Cc: netdev@oss.sgi.com
Subject: Re: [PATCH,RFC] explicit connection confirmation
Date: Thu, 7 Nov 2002 14:49:18 +0100 [thread overview]
Message-ID: <20021107134918.GA28329@outpost.ds9a.nl> (raw)
In-Reply-To: <20021107120956.GA10832@gnu.org>
On Thu, Nov 07, 2002 at 07:09:56AM -0500, Lennert Buytenhek wrote:
> > I think this approach smells, btw - doesn't this mean that processes
> > will now be woken up on receiving a SYN instead of after completion
> > of the handshake?
>
> Yes, it does mean this. You are free to suggest alternatives.
I like having this ability - I dislike offering it to an unsuspecting
userspace.
> > Would make a synflood all the more interesting..
>
> In case of a synflood, the TCP stack will fall back to sending
> syncookies as it normally does.
Yes, but in your setup, a spoofable SYN packet will spawn a process for many
daemons, unless they are modified to first try to read/write to the socket
(which might block!) before forking/pthread_create()ing.
Regards,
bert
--
http://www.PowerDNS.com Versatile DNS Software & Services
http://lartc.org Linux Advanced Routing & Traffic Control HOWTO
next prev parent reply other threads:[~2002-11-07 13:49 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-07 9:32 [PATCH,RFC] explicit connection confirmation Lennert Buytenhek
2002-11-07 11:27 ` bert hubert
2002-11-07 12:09 ` Lennert Buytenhek
2002-11-07 13:36 ` jamal
2002-11-07 15:27 ` Lennert Buytenhek
2002-11-08 11:22 ` jamal
2002-11-08 11:52 ` bert hubert
2002-11-08 11:56 ` Marc Boucher
2002-11-08 18:28 ` Lennert Buytenhek
2002-11-07 13:49 ` bert hubert [this message]
2002-11-07 14:30 ` Lennert Buytenhek
2002-11-07 16:24 ` bert hubert
2003-08-14 13:11 ` Lennert Buytenhek
2003-08-25 11:09 ` Harald Welte
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