em0 hijacking traffic to port 623

Ian FREISLICH ianf at clue.co.za
Tue May 22 06:09:09 UTC 2007


Ian FREISLICH wrote:
> "Jack Vogel" wrote:
> > On 5/21/07, Sten Spans <sten at blinkenlights.nl> wrote:
> > > On Mon, 21 May 2007, Ian FREISLICH wrote:
> > > > 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 :)
> 
> No, it's a March 6 current.  How safe is it to just update the
> sys/dev/em directory and recompile?  Quite a lot has changed in
> CURRENT since then and I don't want to update everything on these
> servers just yet.

Looking at the new source, I'm not sure it will stop this adaptor
gobbling port 623.  It's a 82546EB, e1000_82546_rev_3 e1000_mac_type.
In em_init_manageability(), it looks like it's only disabled for
e1000_mac_type >= e1000_82571 which excludes this adaptor:

                /* enable receiving management packets to the host */
                if (adapter->hw.mac.type >= e1000_82571) {
                        manc |= E1000_MANC_EN_MNG2HOST;
#define E1000_MNG2HOST_PORT_623 (1 << 5)
#define E1000_MNG2HOST_PORT_664 (1 << 6)
                        manc2h |= E1000_MNG2HOST_PORT_623;
                        manc2h |= E1000_MNG2HOST_PORT_664;
                        E1000_WRITE_REG(&adapter->hw, E1000_MANC2H, manc2h);
                }

I'll give the driver a whirl anyway.  If it doesn't, is it safe to write
'manc |= E1000_MANC_EN_MNG2HOST' for adapter->hw.mac.type >= e1000_82546?

Ian

--
Ian Freislich



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