linux-kernel - Re: Get physical MAC address

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20080102045800.GC10762@auslistsprd01.us.dell.com>
Date:	Tue, 1 Jan 2008 22:58:00 -0600
From:	Matt Domsch <Matt_Domsch@...l.com>
To:	Theewara Vorakosit <thvo@...nc.cpe.ku.ac.th>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Get physical MAC address

On Mon, Dec 31, 2007 at 12:39:11PM +0700, Theewara Vorakosit wrote:
> Hello,
> 
> I get MAC address from ioctl. However, ifconfig can change this  MAC 
> address. Can I get a real physical MAC address of the NIC?

yes.  It's ETHTOOL_GPERMADDR to the ethtool ioctl.

        case ETHTOOL_GPERMADDR:
                rc = ethtool_get_perm_addr(dev, useraddr);
                break;

When the driver is first loaded, before ifconfig can change the MAC
address, the existing (permanent) MAC address is stored away, able to
be retrieved via this ioctl.  Jon Wetzel, a Dell intern of a few
summers ago, wrote the code and was able to have it included.

Thanks,
Matt

-- 
Matt Domsch
Linux Technology Strategist, Dell Office of the CTO
linux.dell.com & www.dell.com/linux
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/