netdev - Re: unintended ipv4 broadcast policy change

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Date:	Fri, 24 Jun 2011 12:54:06 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...tta.com
Cc:	herbert@...dor.hengli.com.au, netdev@...r.kernel.org
Subject: Re: unintended ipv4 broadcast policy change

From: Stephen Hemminger <shemminger@...tta.com>
Date: Fri, 24 Jun 2011 10:01:21 -0700

> On Thu, 23 Jun 2011 14:08:21 -0700 (PDT)
> David Miller <davem@...emloft.net> wrote:
> 
>> From: Stephen Hemminger <shemminger@...tta.com>
>> Date: Thu, 23 Jun 2011 17:01:37 -0400
>> 
>> > Standard Debian stable (Squeeze) installation.
>> > $ dpkg -S /sbin/dhclient
>> > isc-dhcp-client: /sbin/dhclient
>> 
>> I bet what happens is that since it isn't reading from
>> the AF_PACKET socket the receive queue just fills up
>> and it's just in the kernel dropping packets in
>> packet_spkt_rcv().
> 
> I don't think that is correct, just instrumented /proc/net/packet
> to add receive queue length is stuck at 0. The packets are getting
> dropped somewhere else.
> 
> sk               RefCnt Type Proto  Iface R Rmem   User   Inode  Count
> ffff880327038000 3      10   0003   3     1 0      0      5881   0

They must be because this is capturing ETH_P_ALL with type SOCK_PACKET
which means receive all packets unconditionally.
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