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The LITMUS^RT kernel.

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author	Russell King <rmk+kernel@arm.linux.org.uk>	2010-02-01 15:06:40 -0500
committer	Russell King <rmk+kernel@arm.linux.org.uk>	2010-02-01 15:06:40 -0500
commit	0b7d5170dc5a4aca144b27d40b67d73b245df066 (patch)
tree	3637e349b22d8554f4febfed4ef03b3ada63d010 /fs/select.c
parent	dbead405801c8d5aa1bc21ab6e2a47f060d47c06 (diff)
parent	66ddfc62caec65a25fd5a8b20f535a2958ee94e6 (diff)

Merge branch 'for-rmk' of git://git.pengutronix.de/git/imx/linux-2.6

Diffstat (limited to 'fs/select.c')

0 files changed, 0 insertions, 0 deletions

> 2005-04-16 18:20:36 -0400 committer Linus Torvalds <torvalds@ppc970.osdl.org> 2005-04-16 18:20:36 -0400 Linux-2.6.12-rc2' href='/cgit/cgit.cgi/litmus-rt.git/commit/net/core/wireless.c?h=v2.6.33-rc4&id=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2'>1da177e4c3f4

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/*
 * This file implement the Wireless Extensions APIs.
 *
 * Authors :	Jean Tourrilhes - HPL - <jt@hpl.hp.com>
 * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
 *
 * (As all part of the Linux kernel, this file is GPL)
 */

/************************** DOCUMENTATION **************************/
/*
 * API definition :
 * --------------
 * See <linux/wireless.h> for details of the APIs and the rest.
 *
 * History :
 * -------
 *
 * v1 - 5.12.01 - Jean II
 *	o Created this file.
 *
 * v2 - 13.12.01 - Jean II
 *	o Move /proc/net/wireless stuff from net/core/dev.c to here
 *	o Make Wireless Extension IOCTLs go through here
 *	o Added iw_handler handling ;-)
 *	o Added standard ioctl description
 *	o Initial dumb commit strategy based on orinoco.c
 *
 * v3 - 19.12.01 - Jean II
 *	o Make sure we don't go out of standard_ioctl[] in ioctl_standard_call
 *	o Add event dispatcher function
 *	o Add event description
 *	o Propagate events as rtnetlink IFLA_WIRELESS option
 *	o Generate event on selected SET requests
 *
 * v4 - 18.04.02 - Jean II
 *	o Fix stupid off by one in iw_ioctl_description : IW_ESSID_MAX_SIZE + 1
 *
 * v5 - 21.06.02 - Jean II
 *	o Add IW_PRIV_TYPE_ADDR in priv_type_size (+cleanup)
 *	o Reshuffle IW_HEADER_TYPE_XXX to map IW_PRIV_TYPE_XXX changes
 *	o Add IWEVCUSTOM for driver specific event/scanning token
 *	o Turn on WE_STRICT_WRITE by default + kernel warning
 *	o Fix WE_STRICT_WRITE in ioctl_export_private() (32 => iw_num)
 *	o Fix off-by-one in test (extra_size <= IFNAMSIZ)
 *
 * v6 - 9.01.03 - Jean II
 *	o Add common spy support : iw_handler_set_spy(), wireless_spy_update()
 *	o Add enhanced spy support : iw_handler_set_thrspy() and event.
 *	o Add WIRELESS_EXT version display in /proc/net/wireless
 *
 * v6 - 18.06.04 - Jean II
 *	o Change get_spydata() method for added safety
 *	o Remove spy #ifdef, they are always on -> cleaner code
 *	o Allow any size GET request if user specifies length > max
 *		and if request has IW_DESCR_FLAG_NOMAX flag or is SIOCGIWPRIV
 *	o Start migrating get_wireless_stats to struct iw_handler_def
 *	o Add wmb() in iw_handler_set_spy() for non-coherent archs/cpus
 * Based on patch from Pavel Roskin <proski@gnu.org> :
 *	o Fix kernel data leak to user space in private handler handling
 *
 * v7 - 18.3.05 - Jean II
 *	o Remove (struct iw_point *)->pointer from events and streams
 *	o Remove spy_offset from struct iw_handler_def
 *	o Start deprecating dev->get_wireless_stats, output a warning
 *	o If IW_QUAL_DBM is set, show dBm values in /proc/net/wireless
 *	o Don't loose INVALID/DBM flags when clearing UPDATED flags (iwstats)
 *
 * v8 - 17.02.06 - Jean II
 *	o RtNetlink requests support (SET/GET)
 *
 * v8b - 03.08.06 - Herbert Xu
 *	o Fix Wireless Event locking issues.
 *
 * v9 - 14.3.06 - Jean II
 *	o Change length in ESSID and NICK to strlen() instead of strlen()+1
 *	o Make standard_ioctl_num and standard_event_num unsigned
 *	o Remove (struct net_device *)->get_wireless_stats()
 *
 * v10 - 16.3.07 - Jean II
 *	o Prevent leaking of kernel space in stream on 64 bits.
 */

/***************************** INCLUDES *****************************/

#include <linux/module.h>
#include <linux/types.h>		/* off_t */
#include <linux/netdevice.h>		/* struct ifreq, dev_get_by_name() */
#include <linux/proc_fs.h>
#include <linux/rtnetlink.h>		/* rtnetlink stuff */
#include <linux/seq_file.h>
#include <linux/init.h>			/* for __init */
#include <linux/if_arp.h>		/* ARPHRD_ETHER */
#include <linux/etherdevice.h>		/* compare_ether_addr */
#include <linux/interrupt.h>
#include <net/net_namespace.h>

#include <linux/wireless.h>		/* Pretty obvious */
#include <net/iw_handler.h>		/* New driver API */
#include <net/netlink.h>
#include <net/wext.h>

#include <asm/uaccess.h>		/* copy_to_user() */

/************************* GLOBAL VARIABLES *************************/
/*
 * You should not use global variables, because of re-entrancy.
 * On our case, it's only const, so it's OK...
 */
/*
 * Meta-data about all the standard Wireless Extension request we
 * know about.
 */
static const struct iw_ioctl_description standard_ioctl[] = {
	[SIOCSIWCOMMIT	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_NULL,
	},
	[SIOCGIWNAME	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_CHAR,
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWNWID	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
		.flags		= IW_DESCR_FLAG_EVENT,
	},
	[SIOCGIWNWID	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWFREQ	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_FREQ,
		.flags		= IW_DESCR_FLAG_EVENT,
	},
	[SIOCGIWFREQ	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_FREQ,
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWMODE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_UINT,
		.flags		= IW_DESCR_FLAG_EVENT,
	},
	[SIOCGIWMODE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_UINT,
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWSENS	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWSENS	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWRANGE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_NULL,
	},
	[SIOCGIWRANGE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= sizeof(struct iw_range),
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWPRIV	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_NULL,
	},
	[SIOCGIWPRIV	- SIOCIWFIRST] = { /* (handled directly by us) */
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct iw_priv_args),
		.max_tokens	= 16,
		.flags		= IW_DESCR_FLAG_NOMAX,
	},
	[SIOCSIWSTATS	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_NULL,
	},
	[SIOCGIWSTATS	- SIOCIWFIRST] = { /* (handled directly by us) */
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= sizeof(struct iw_statistics),
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWSPY	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct sockaddr),
		.max_tokens	= IW_MAX_SPY,
	},
	[SIOCGIWSPY	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct sockaddr) +
				  sizeof(struct iw_quality),
		.max_tokens	= IW_MAX_SPY,
	},
	[SIOCSIWTHRSPY	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct iw_thrspy),
		.min_tokens	= 1,
		.max_tokens	= 1,
	},
	[SIOCGIWTHRSPY	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct iw_thrspy),
		.min_tokens	= 1,
		.max_tokens	= 1,
	},
	[SIOCSIWAP	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
	},
	[SIOCGIWAP	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWMLME	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= sizeof(struct iw_mlme),
		.max_tokens	= sizeof(struct iw_mlme),
	},
	[SIOCGIWAPLIST	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= sizeof(struct sockaddr) +
				  sizeof(struct iw_quality),
		.max_tokens	= IW_MAX_AP,
		.flags		= IW_DESCR_FLAG_NOMAX,
	},
	[SIOCSIWSCAN	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= 0,
		.max_tokens	= sizeof(struct iw_scan_req),
	},
	[SIOCGIWSCAN	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_SCAN_MAX_DATA,
		.flags		= IW_DESCR_FLAG_NOMAX,
	},
	[SIOCSIWESSID	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ESSID_MAX_SIZE,
		.flags		= IW_DESCR_FLAG_EVENT,
	},
	[SIOCGIWESSID	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ESSID_MAX_SIZE,
		.flags		= IW_DESCR_FLAG_DUMP,
	},
	[SIOCSIWNICKN	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ESSID_MAX_SIZE,
	},
	[SIOCGIWNICKN	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ESSID_MAX_SIZE,
	},
	[SIOCSIWRATE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWRATE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWRTS	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWRTS	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWFRAG	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWFRAG	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWTXPOW	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWTXPOW	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWRETRY	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWRETRY	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWENCODE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ENCODING_TOKEN_MAX,
		.flags		= IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
	},
	[SIOCGIWENCODE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_ENCODING_TOKEN_MAX,
		.flags		= IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
	},
	[SIOCSIWPOWER	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWPOWER	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWGENIE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
	},
	[SIOCGIWGENIE	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
	},
	[SIOCSIWAUTH	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCGIWAUTH	- SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_PARAM,
	},
	[SIOCSIWENCODEEXT - SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= sizeof(struct iw_encode_ext),
		.max_tokens	= sizeof(struct iw_encode_ext) +
				  IW_ENCODING_TOKEN_MAX,
	},
	[SIOCGIWENCODEEXT - SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= sizeof(struct iw_encode_ext),
		.max_tokens	= sizeof(struct iw_encode_ext) +
				  IW_ENCODING_TOKEN_MAX,
	},
	[SIOCSIWPMKSA - SIOCIWFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.min_tokens	= sizeof(struct iw_pmksa),
		.max_tokens	= sizeof(struct iw_pmksa),
	},
};
static const unsigned standard_ioctl_num = ARRAY_SIZE(standard_ioctl);

/*
 * Meta-data about all the additional standard Wireless Extension events
 * we know about.
 */
static const struct iw_ioctl_description standard_event[] = {
	[IWEVTXDROP	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
	},
	[IWEVQUAL	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_QUAL,
	},
	[IWEVCUSTOM	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_CUSTOM_MAX,
	},
	[IWEVREGISTERED	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
	},
	[IWEVEXPIRED	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_ADDR,
	},
	[IWEVGENIE	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
	},
	[IWEVMICHAELMICFAILURE	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= sizeof(struct iw_michaelmicfailure),
	},
	[IWEVASSOCREQIE	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
	},
	[IWEVASSOCRESPIE	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= IW_GENERIC_IE_MAX,
	},
	[IWEVPMKIDCAND	- IWEVFIRST] = {
		.header_type	= IW_HEADER_TYPE_POINT,
		.token_size	= 1,
		.max_tokens	= sizeof(struct iw_pmkid_cand),
	},
};
static const unsigned standard_event_num = ARRAY_SIZE(standard_event);

/* Size (in bytes) of the various private data types */
static const char iw_priv_type_size[] = {
	0,				/* IW_PRIV_TYPE_NONE */
	1,				/* IW_PRIV_TYPE_BYTE */
	1,				/* IW_PRIV_TYPE_CHAR */
	0,				/* Not defined */
	sizeof(__u32),			/* IW_PRIV_TYPE_INT */
	sizeof(struct iw_freq),		/* IW_PRIV_TYPE_FLOAT */
	sizeof(struct sockaddr),	/* IW_PRIV_TYPE_ADDR */
	0,				/* Not defined */
};

/* Size (in bytes) of various events */
static const int event_type_size[] = {
	IW_EV_LCP_LEN,			/* IW_HEADER_TYPE_NULL */
	0,
	IW_EV_CHAR_LEN,			/* IW_HEADER_TYPE_CHAR */
	0,
	IW_EV_UINT_LEN,			/* IW_HEADER_TYPE_UINT */
	IW_EV_FREQ_LEN,			/* IW_HEADER_TYPE_FREQ */
	IW_EV_ADDR_LEN,			/* IW_HEADER_TYPE_ADDR */
	0,
	IW_EV_POINT_LEN,		/* Without variable payload */
	IW_EV_PARAM_LEN,		/* IW_HEADER_TYPE_PARAM */
	IW_EV_QUAL_LEN,			/* IW_HEADER_TYPE_QUAL */
};


/************************ COMMON SUBROUTINES ************************/
/*
 * Stuff that may be used in various place or doesn't fit in one
 * of the section below.
 */

/* ---------------------------------------------------------------- */
/*
 * Return the driver handler associated with a specific Wireless Extension.
 */
static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
{
	/* Don't "optimise" the following variable, it will crash */
	unsigned int	index;		/* *MUST* be unsigned */

	/* Check if we have some wireless handlers defined */
	if (dev->wireless_handlers == NULL)
		return NULL;

	/* Try as a standard command */
	index = cmd - SIOCIWFIRST;
	if (index < dev->wireless_handlers->num_standard)
		return dev->wireless_handlers->standard[index];

	/* Try as a private command */
	index = cmd - SIOCIWFIRSTPRIV;
	if (index < dev->wireless_handlers->num_private)
		return dev->wireless_handlers->private[index];

	/* Not found */
	return NULL;
}

/* ---------------------------------------------------------------- */
/*
 * Get statistics out of the driver
 */
static struct iw_statistics *get_wireless_stats(struct net_device *dev)
{
	/* New location */
	if ((dev->wireless_handlers != NULL) &&
	   (dev->wireless_handlers->get_wireless_stats != NULL))
		return dev->wireless_handlers->get_wireless_stats(dev);

	/* Not found */
	return NULL;
}

/* ---------------------------------------------------------------- */
/*
 * Call the commit handler in the driver
 * (if exist and if conditions are right)
 *
 * Note : our current commit strategy is currently pretty dumb,
 * but we will be able to improve on that...
 * The goal is to try to agreagate as many changes as possible
 * before doing the commit. Drivers that will define a commit handler
 * are usually those that need a reset after changing parameters, so
 * we want to minimise the number of reset.
 * A cool idea is to use a timer : at each "set" command, we re-set the
 * timer, when the timer eventually fires, we call the driver.
 * Hopefully, more on that later.
 *
 * Also, I'm waiting to see how many people will complain about the
 * netif_running(dev) test. I'm open on that one...
 * Hopefully, the driver will remember to do a commit in "open()" ;-)
 */
static int call_commit_handler(struct net_device *dev)
{
	if ((netif_running(dev)) &&
	   (dev->wireless_handlers->standard[0] != NULL))
		/* Call the commit handler on the driver */
		return dev->wireless_handlers->standard[0](dev, NULL,
							   NULL, NULL);
	else
		return 0;		/* Command completed successfully */
}

/* ---------------------------------------------------------------- */
/*
 * Calculate size of private arguments
 */
static int get_priv_size(__u16 args)
{
	int	num = args & IW_PRIV_SIZE_MASK;
	int	type = (args & IW_PRIV_TYPE_MASK) >> 12;

	return num * iw_priv_type_size[type];
}

/* ---------------------------------------------------------------- */
/*
 * Re-calculate the size of private arguments
 */
static int adjust_priv_size(__u16 args, struct iw_point *iwp)
{
	int	num = iwp->length;
	int	max = args & IW_PRIV_SIZE_MASK;
	int	type = (args & IW_PRIV_TYPE_MASK) >> 12;

	/* Make sure the driver doesn't goof up */
	if (max < num)
		num = max;

	return num * iw_priv_type_size[type];
}

/* ---------------------------------------------------------------- */
/*
 * Standard Wireless Handler : get wireless stats
 *	Allow programatic access to /proc/net/wireless even if /proc
 *	doesn't exist... Also more efficient...
 */
static int iw_handler_get_iwstats(struct net_device *		dev,
				  struct iw_request_info *	info,
				  union iwreq_data *		wrqu,
				  char *			extra)
{
	/* Get stats from the driver */
	struct iw_statistics *stats;

	stats = get_wireless_stats(dev);
	if (stats) {
		/* Copy statistics to extra */
		memcpy(extra, stats, sizeof(struct iw_statistics));
		wrqu->data.length = sizeof(struct iw_statistics);

		/* Check if we need to clear the updated flag */
		if (wrqu->data.flags != 0)
			stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
		return 0;
	} else
		return -EOPNOTSUPP;
}

/* ---------------------------------------------------------------- */
/*
 * Standard Wireless Handler : get iwpriv definitions
 * Export the driver private handler definition
 * They will be picked up by tools like iwpriv...
 */
static int iw_handler_get_private(struct net_device *		dev,
				  struct iw_request_info *	info,
				  union iwreq_data *		wrqu,
				  char *			extra)
{
	/* Check if the driver has something to export */
	if ((dev->wireless_handlers->num_private_args == 0) ||
	   (dev->wireless_handlers->private_args == NULL))
		return -EOPNOTSUPP;

	/* Check if there is enough buffer up there */
	if (wrqu->data.length < dev->wireless_handlers->num_private_args) {
		/* User space can't know in advance how large the buffer
		 * needs to be. Give it a hint, so that we can support
		 * any size buffer we want somewhat efficiently... */
		wrqu->data.length = dev->wireless_handlers->num_private_args;
		return -E2BIG;
	}

	/* Set the number of available ioctls. */
	wrqu->data.length = dev->wireless_handlers->num_private_args;

	/* Copy structure to the user buffer. */
	memcpy(extra, dev->wireless_handlers->private_args,
	       sizeof(struct iw_priv_args) * wrqu->data.length);

	return 0;
}


/******************** /proc/net/wireless SUPPORT ********************/
/*
 * The /proc/net/wireless file is a human readable user-space interface
 * exporting various wireless specific statistics from the wireless devices.
 * This is the most popular part of the Wireless Extensions ;-)
 *
 * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
 * The content of the file is basically the content of "struct iw_statistics".
 */

#ifdef CONFIG_PROC_FS

/* ---------------------------------------------------------------- */
/*
 * Print one entry (line) of /proc/net/wireless
 */
static void wireless_seq_printf_stats(struct seq_file *seq,
				      struct net_device *dev)
{
	/* Get stats from the driver */
	struct iw_statistics *stats = get_wireless_stats(dev);

	if (stats) {
		seq_printf(seq, "%6s: %04x  %3d%c  %3d%c  %3d%c  %6d %6d %6d "
				"%6d %6d   %6d\n",
			   dev->name, stats->status, stats->qual.qual,
			   stats->qual.updated & IW_QUAL_QUAL_UPDATED
			   ? '.' : ' ',
			   ((__s32) stats->qual.level) -
			   ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
			   stats->qual.updated & IW_QUAL_LEVEL_UPDATED
			   ? '.' : ' ',
			   ((__s32) stats->qual.noise) -
			   ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
			   stats->qual.updated & IW_QUAL_NOISE_UPDATED
			   ? '.' : ' ',
			   stats->discard.nwid, stats->discard.code,
			   stats->discard.fragment, stats->discard.retries,
			   stats->discard.misc, stats->miss.beacon);
		stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
	}
}

/* ---------------------------------------------------------------- */
/*
 * Print info for /proc/net/wireless (print all entries)
 */
static int wireless_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN)
		seq_printf(seq, "Inter-| sta-|   Quality        |   Discarded "
				"packets               | Missed | WE\n"
				" face | tus | link level noise |  nwid  "
				"crypt   frag  retry   misc | beacon | %d\n",
			   WIRELESS_EXT);
	else
		wireless_seq_printf_stats(seq, v);
	return 0;
}

static const struct seq_operations wireless_seq_ops = {
	.start = dev_seq_start,
	.next  = dev_seq_next,
	.stop  = dev_seq_stop,
	.show  = wireless_seq_show,
};

static int wireless_seq_open(struct inode *inode, struct file *file)
{
	return seq_open_net(inode, file, &wireless_seq_ops,
			    sizeof(struct seq_net_private));
}

static const struct file_operations wireless_seq_fops = {
	.owner	 = THIS_MODULE,
	.open    = wireless_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release_net,
};

int wext_proc_init(struct net *net)
{
	/* Create /proc/net/wireless entry */
	if (!proc_net_fops_create(net, "wireless", S_IRUGO, &wireless_seq_fops))
		return -ENOMEM;

	return 0;
}

void wext_proc_exit(struct net *net)
{
	proc_net_remove(net, "wireless");
}
#endif	/* CONFIG_PROC_FS */

/************************** IOCTL SUPPORT **************************/
/*
 * The original user space API to configure all those Wireless Extensions
 * is through IOCTLs.
 * In there, we check if we need to call the new driver API (iw_handler)
 * or just call the driver ioctl handler.
 */

/* ---------------------------------------------------------------- */


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