From: kuznet@ms2.inr.ac.ru
To: ak@suse.de (Andi Kleen)
Cc: ak@suse.de, joris@deadlock.et.tudelft.nl, linux-kernel@vger.kernel.org
Subject: Re: Bind to protocol with AF_PACKET doesn't work for outgoing packets
Date: Thu, 1 Nov 2001 22:48:13 +0300 (MSK) [thread overview]
Message-ID: <200111011948.WAA27345@ms2.inr.ac.ru> (raw)
In-Reply-To: <20011101202845.A10648@wotan.suse.de> from "Andi Kleen" at Nov 1, 1 08:28:45 pm
Hello!
> Just to have an symmetric API. Everything else is too ugly to explain
> in manpages ;)
Explaining is easy. Blah-blah-blah... Sockets bound to ETH_P_ALL
are able to get copy of output packets which is useful f.e.
for packet sniffers (ref to [libpacp],[tcpdump]). In later kernels
this can be disabled with option PACKET_NOOUTPUT. When this option
is not supported user of packet socket bound to ETH_P_ALL has to filter
output packets at user level checking for pkt_type == PACKET_OUTPUT
or using an equivalent BPF applet.
> That would require changing/breaking PF_PACKET, no?
No. Ideally the option could be PACKET_GRAB_OUTPUT and be disabled
by default (for symmetry :-)). But as soon as it was forgotten,
it has to be enabled by default.
Alexey
next prev parent reply other threads:[~2001-11-01 19:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.21.0111010944050.16656-100000@deadlock.et.tudelft.nl.suse.lists.linux.kernel>
2001-11-01 14:30 ` Andi Kleen
2001-11-01 15:18 ` Joris van Rantwijk
2001-11-01 16:46 ` Andi Kleen
2001-11-01 17:33 ` kuznet
2001-11-01 17:45 ` Andi Kleen
2001-11-01 18:09 ` kuznet
2001-11-01 18:21 ` Andi Kleen
2001-11-01 18:56 ` kuznet
2001-11-01 19:28 ` Andi Kleen
2001-11-01 19:48 ` kuznet [this message]
2001-11-01 9:11 Joris van Rantwijk
2001-11-02 2:26 ` Edgar Toernig
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