netdev - Re: [PATCH] [V3] net: add Xilinx emac lite device driver

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: <20090820094914.46f1db9c@nehalam>
Date:	Thu, 20 Aug 2009 09:49:14 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	John Linn <john.linn@...inx.com>
Cc:	netdev@...r.kernel.org, linuxppc-dev@...abs.org,
	davem@...emloft.net, jgarzik@...ox.com,
	John Linn <john.linn@...inx.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	John Williams <john.williams@...alogix.com>,
	Michal Simek <michal.simek@...alogix.com>,
	Sadanand M <sadanan@...inx.com>
Subject: Re: [PATCH] [V3] net: add Xilinx emac lite device driver

On Thu, 20 Aug 2009 03:49:51 -0600
John Linn <john.linn@...inx.com> wrote:

> +/**
> + * xemaclite_ioctl - Perform IO Control operations on the network device
> + * @dev:	Pointer to the network device
> + * @rq:		Pointer to the interface request structure
> + * @cmd:	IOCTL command
> + *
> + * The only IOCTL operation supported by this function is setting the MAC
> + * address. An error is reported if any other operations are requested.
> + *
> + * Return:	0 to indicate success, or a negative error for failure.
> + */
> +static int xemaclite_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
> +{
> +	struct net_local *lp = (struct net_local *) netdev_priv(dev);
> +	struct hw_addr_data *hw_addr = (struct hw_addr_data *) &rq->ifr_hwaddr;
> +
> +	switch (cmd) {
> +	case SIOCETHTOOL:
> +		return -EIO;
> +
> +	case SIOCSIFHWADDR:
> +		dev_err(&lp->ndev->dev, "SIOCSIFHWADDR\n");
> +
> +		/* Copy MAC address in from user space */
> +		copy_from_user((void __force *) dev->dev_addr,
> +			       (void __user __force *) hw_addr,
> +			       IFHWADDRLEN);
> +		xemaclite_set_mac_address(lp, dev->dev_addr);
> +		break;
> +	default:
> +		return -EOPNOTSUPP;
> +	}
> +
> +	return 0;
> +}

Do you really need this? I doubt the SIOCSIFHWADDR even reaches driver!

The normal call path for setting hardware address is:
  dev_ifsioc
         dev_set_mac_address
             ops->ndo_set_mac_address --> 

The driver should be:
   1. defining new code to do ndo_set_mac_address
   2. remove existing xmaclite_ioctl - all ioctl's handled by upper layers

FYI - the only ioctl's that make it to network device ndo_ioctl
 are listed in dev_ifsioc
   SIOCDEVPRIVATE ... SIOCDEVPRIVATE + 15
   SIOCBOND*
   SIOCMII*
   SIOCBR*
   SIOCHWTSTAMP
   SIOCWANDEV


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html