Date: Fri, 13 Jul 2007 15:15:50 +0200 From: Ian FREISLICH <ianf@clue.co.za> To: freebsd-current@freebsd.org, Jack Vogel <jfvogel@gmail.com> Subject: Re: em0 hijacking traffic to port 623 Message-ID: <E1I9Kzu-0001lV-HJ@clue.co.za> In-Reply-To: Message from John Baldwin <jhb@freebsd.org> of "Fri, 13 Jul 2007 08:47:59 -0400." <200707130848.01101.jhb@freebsd.org>
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John Baldwin wrote: > On Monday 21 May 2007 07:17:07 pm Jack Vogel wrote: > > On 5/21/07, Sten Spans <sten@blinkenlights.nl> wrote: > > > On Mon, 21 May 2007, Ian FREISLICH wrote: > > > > > > > Hi > > > > > > > > We've noticed an issue on our firewalls where the first em device > > > > in the system hijacks inbound port 623 tcp and udp. The OS never > > > > sees this traffic. Interestingly, em1 and em2 do not appear to be > > > > afflicted by this problem. Some reading I've done points to a > > > > similar conclusion: > > > > > > > > http://blogs.sun.com/shepler/entry/port_623_or_the_mount > > > > > > > > I've looked at the bios, but I can't find any settings that remotely > > > > hint IPMI or RMCP+ or serial-over-lan. > > > > > > > > Does anyone know how I can stop the card or system from stealing > > > > port 623 in hardware or must I just stop using em0 (and/or Intel NICS)? > > > > > > Does "ifconfig em0 promisc" help ? > > > That fixed firmware related vanishing ipv6 packets on fxp and em. > > > > Is this happening even with the latest CURRENT driver, there is code in > > it now that is supposed to stop the firmware from doing that, at least > > that was the theory :) > > We still see this at work. We use this workaround in /etc/sysctl.conf: > > net.inet.ip.portrange.lowlast=665 > > It seems that the em0 interface always snoops 623 looking for RCMP > packets for IPMI (or ASF). =================================================================== RCS file: /home/ncvs/src/sys/dev/em/e1000_82540.c,v retrieving revision 1.3 diff -u -d -r1.3 e1000_82540.c --- e1000_82540.c 16 May 2007 00:14:23 -0000 1.3 +++ e1000_82540.c 25 May 2007 13:40:19 -0000 @@ -316,6 +316,7 @@ /* Disable HW ARPs on ASF enabled adapters */ manc = E1000_READ_REG(hw, E1000_MANC); manc &= ~E1000_MANC_ARP_EN; + manc &= ~(E1000_MANC_RMCP_EN | E1000_MANC_0298_EN); E1000_WRITE_REG(hw, E1000_MANC, manc); E1000_WRITE_REG(hw, E1000_IMC, 0xffffffff); Fixes it for me. But, of course, I'm not interested in ASF on my gateway hosts. I didn't look further into the initalization of the chip. The datasheet I downloaded suggests that you can filter these packets on IP address as well and I suspect the option is turned on with some default in the EEPROM register that equates to 0.0.0.0/0. Ian -- Ian Freislich
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