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Re: [Devil-linux-develop] Enable "nameif" to associate MAC address with correct interface name
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From: Stefan E. <ma...@en...> - 2010-05-05 14:19:15
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Hi,
his patch looks just like what I have been looking for. I will add it to
my VM test environment for testing. As far as I can see, nothing of the
current network handling gets broken if /etc/mactab and
/etc/mactable.conf are missing, so I would vote to add this patch to DL.
Regards,
Stefan
Steve Ralph wrote:
>
> Hi,
>
> I have just submitted a mantis-patch for "/etc/init.d/network" that
> calls nameif to name network interfaces based on MAC addresses. The call
> is only made if the required "/etc/mactab" file exists and is readable.
> Nameif is called on a per-interface basis after the module has been
> modprob'ed into place.
>
> Please note that the version of "/etc/init.d/network" that was used as a
> starting point was "# $Revision: 1.44 $" which is has been patched for
> interface aliases and has a higher revision number than version 1.43
> that ships with DL-1.4-RC3.
>
> There are two distinct but linked patches contained in the one file.
> They could be separated quite easily, if required.
>
> The first patch that calls nameif/mactab is:
> @@ -162,8 +163,18 @@
> if [ "$MODULE" != "UNKNOWN" ] && [ "$MODULE" !=
> "autoselect" ] ; then
> modprobe $MODULE $MODULE_OPTS > /dev/null
> fi
> fi
> + # Using /etc/mactab (may have been created from
> /etc/mactable.conf
> + # Process IF for active Media Access Control
> (Ethernet MAC) Address.
> + # Only process interfaces which DON'T have a :-_.
> (Colon/dash/underscore/dot) in them.
> + #
> + if [ -r /etc/mactab ]; then
> + if [ `expr index "$IF" ":-_."` == 0 ]; then
> + UseIFMac=`/bin/grep --ignore-case "^$IF"
> /etc/mactab`
> + /sbin/nameif -s $UseIFMac
> + fi
> + fi
>
>
> if [ "$WIRELESS" = "yes" ]; then
> setup_wireless $DEVICE
>
> The format for the optional configuration file "/etc/mactab" may be
> taken from my proposed "/etc/mactab.sample":
>
> #--- /etc/mactab.sample
> #
> # Example format for /etc/mactab.
> # Used by nameif to name network interfaces based on MAC
> addresses
> #
> eth0 00:40:f4:b8:db:2f
> eth1 00:40:f4:b8:db:2e
> eth2 00:40:f4:b8:db:2d
> #
> #--- End
>
> I believe this implements standard functionality to control network
> interfaces names based on MAC addresses.
>
> If implemented, this would prevent udev shuffling interface names across
> a system reboot.
>
> The second part of the patch introduces new functionality with the
> specific aim to allow a single DL-etc-mods.tar.bz2 config to be moved
> onto a cold-standby unit, and automatically receive the correct
> (preconfigured) interface assignments.
>
> The patch is a follows:
>
> @@ -376,8 +387,16 @@
> # if vlan tools are installed set vlan naming shema
> #
> test -x $VLAN && $VLAN set_name_type
> VLAN_PLUS_VID_NO_PAD &> /dev/null
>
> + # if /etc/mactable.conf is readable then
> + # extract lines for each available MAC Address we
> have
> + # and create/overwrite /etc/mactab
> + if [ -r /etc/mactable.conf ]; then
> + MacList=`/sbin/ip addr show | /bin/grep
> "link/ether" | /bin/sed "s#.*link\/ether \| brd #\|#ig" | /usr/bin/cut
> -f2 -d'|'`
> + /bin/grep -F "$MacList" /etc/mactable.conf |
> /usr/bin/cut -f-2 -d'|' | /bin/sed "s#|# #" >/etc/mactab
> + fi
> +
> #
> # physical interfaces are brought up first
> #
> for interface in $(cd ${CONFIG_DIR}; ls -1
> ${CONFIG_FILE}* 2>/dev/null | sed \
>
> The key here is the use of a new "/etc/mactable.conf " config file which
> is preconfigured with interface and MAC details for both the production
> and the standby hardware.
>
> Again, the format for the optional configuration file
> "/etc/mactable.conf" may be taken from my proposed
> "/etc/mactable.conf.sample":
>
> #--- /etc/mactable.conf.sample
> #
> # Interface name | MAC Address | Comment
> #
> eth0|00:40:f4:b8:db:2f| Gannet01 (Production fw) lan1
> eth1|00:40:f4:b8:db:2e| Gannet01 (Production fw) lan2
> eth2|00:40:f4:b8:db:2d| Gannet01 (Production fw) lan3
> #
> eth0|00:30:18:49:5f:08| Gannet02 (Cold Standby fw) lan1
> eth1|00:30:18:49:5f:07| Gannet02 (Cold Standby fw) lan2
> eth2|00:30:18:49:5f:06| Gannet02 (Cold Standby fw) lan3
> #
> eth0|00:11:85:10:be:f9| Hippopotamus (Development/testbed) eth0
> eth1|00:10:5a:28:51:36| Hippopotamus (Development/testbed) eth1
> eth2|00:50:04:3a:aa:5b| Hippopotamus (Development/testbed) eth2
> #
> #--- End
>
> Here three systems have their interface and mac details catalogued. When
> the patched "/etc/init.d/network" file is run, it extracts mac-addresses
> from "/etc/mactable.conf " that match the physically identified
> interfaces, and repopulates "/etc/mactab" ready for nameif to use, but
> containing only details appropriate for (in the sample) "Gannet01",
> "Gannet02", or "Hippopotamus".
>
> If the first "/etc/mactab" patch is rejected, then the second
> "/etc/mactable.conf" automatically falls, as it depends on nameif being
> run against the newly created " /etc/mactab" file.
>
> This will, I believe, give Stefan [ma...@en...] the ability to
> have a replacement firewall on cold-standby.
>
> Much of the above code must be credited to my colleague Roy Barnard.
>
> Regards - Steve.
>
> Stephen H F Ralph
> Principal Computer Officer | Integration Team | ICT Services | Transform
> Sandwell
> Sandwell MBC | Freeth Street | Oldbury | West Midlands | B69 3DE
> Tel: 0121 569 3132 | Fax: 0121 569 3493
> Email: ste...@sa... <mailto:ste...@sa...>
>
>
>
>
>
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