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gerrit-public.fairphone.software / kernel / msm-4.9 / 146425a316fb937fbdcac018b34a23c67d12214b / . / net / core / wireless.c
blob: 750cc5daeb033b74f36991a5f361aa6ee597b7a8 [file] [log] [blame]
/*
* This file implement the Wireless Extensions APIs.
*
* Authors : Jean Tourrilhes - HPL - <jt@hpl.hp.com>
* Copyright (c) 1997-2004 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
*/
/***************************** INCLUDES *****************************/
#include <linux/config.h> /* Not needed ??? */
#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/wireless.h> /* Pretty obvious */
#include <net/iw_handler.h> /* New driver API */
#include <asm/uaccess.h> /* copy_to_user() */
/**************************** CONSTANTS ****************************/
/* Debugging stuff */
#undef WE_IOCTL_DEBUG /* Debug IOCTL API */
#undef WE_EVENT_DEBUG /* Debug Event dispatcher */
#undef WE_SPY_DEBUG /* Debug enhanced spy support */
/* Options */
#define WE_EVENT_NETLINK /* Propagate events using rtnetlink */
#define WE_SET_EVENT /* Generate an event on some set commands */
/************************* 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_NULL,
},
[SIOCSIWSTATS - SIOCIWFIRST] = {
.header_type = IW_HEADER_TYPE_NULL,
},
[SIOCGIWSTATS - SIOCIWFIRST] = { /* (handled directly by us) */
.header_type = IW_HEADER_TYPE_NULL,
.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,
},
[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_PARAM,
},
[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 + 1,
.flags = IW_DESCR_FLAG_EVENT,
},
[SIOCGIWESSID - SIOCIWFIRST] = {
.header_type = IW_HEADER_TYPE_POINT,
.token_size = 1,
.max_tokens = IW_ESSID_MAX_SIZE + 1,
.flags = IW_DESCR_FLAG_DUMP,
},
[SIOCSIWNICKN - SIOCIWFIRST] = {
.header_type = IW_HEADER_TYPE_POINT,
.token_size = 1,
.max_tokens = IW_ESSID_MAX_SIZE + 1,
},
[SIOCGIWNICKN - SIOCIWFIRST] = {
.header_type = IW_HEADER_TYPE_POINT,
.token_size = 1,
.max_tokens = IW_ESSID_MAX_SIZE + 1,
},
[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,
},
};
static const int standard_ioctl_num = (sizeof(standard_ioctl) /
sizeof(struct iw_ioctl_description));
/*
* 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,
},
};
static const int standard_event_num = (sizeof(standard_event) /
sizeof(struct iw_ioctl_description));
/* 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.
* Called from various place, so make sure it remains efficient.
*/
static inline 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 inline 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);
/* Old location, will be phased out in next WE */
return (dev->get_wireless_stats ?
dev->get_wireless_stats(dev) :
(struct iw_statistics *) 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 inline 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 inline 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 inline int adjust_priv_size(__u16 args,
union iwreq_data * wrqu)
{
int num = wrqu->data.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];
}
/******************** /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 __inline__ 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
? '.' : ' ',
((__u8) stats->qual.level),
stats->qual.updated & IW_QUAL_LEVEL_UPDATED
? '.' : ' ',
((__u8) stats->qual.noise),
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 = 0;
}
}
/* ---------------------------------------------------------------- */
/*
* 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;
}
extern void *dev_seq_start(struct seq_file *seq, loff_t *pos);
extern void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos);
extern void dev_seq_stop(struct seq_file *seq, void *v);
static 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(file, &wireless_seq_ops);
}
static struct file_operations wireless_seq_fops = {
.owner = THIS_MODULE,
.open = wireless_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
int __init wireless_proc_init(void)
{
if (!proc_net_fops_create("wireless", S_IRUGO, &wireless_seq_fops))
return -ENOMEM;
return 0;
}
#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.
*/
/* ---------------------------------------------------------------- */
/*
* Allow programatic access to /proc/net/wireless even if /proc
* doesn't exist... Also more efficient...
*/
static inline int dev_iwstats(struct net_device *dev, struct ifreq *ifr)
{
/* Get stats from the driver */
struct iw_statistics *stats;
stats = get_wireless_stats(dev);
if (stats != (struct iw_statistics *) NULL) {
struct iwreq * wrq = (struct iwreq *)ifr;
/* Copy statistics to the user buffer */
if(copy_to_user(wrq->u.data.pointer, stats,
sizeof(struct iw_statistics)))
return -EFAULT;
/* Check if we need to clear the update flag */
if(wrq->u.data.flags != 0)
stats->qual.updated = 0;
return 0;
} else
return -EOPNOTSUPP;
}
/* ---------------------------------------------------------------- */
/*
* Export the driver private handler definition
* They will be picked up by tools like iwpriv...
*/
static inline int ioctl_export_private(struct net_device * dev,
struct ifreq * ifr)
{
struct iwreq * iwr = (struct iwreq *) ifr;
/* 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 NULL pointer */
if(iwr->u.data.pointer == NULL)
return -EFAULT;
/* Check if there is enough buffer up there */
if(iwr->u.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... */
iwr->u.data.length = dev->wireless_handlers->num_private_args;
return -E2BIG;
}
/* Set the number of available ioctls. */
iwr->u.data.length = dev->wireless_handlers->num_private_args;
/* Copy structure to the user buffer. */
if (copy_to_user(iwr->u.data.pointer,
dev->wireless_handlers->private_args,
sizeof(struct iw_priv_args) * iwr->u.data.length))
return -EFAULT;
return 0;
}
/* ---------------------------------------------------------------- */
/*
* Wrapper to call a standard Wireless Extension handler.
* We do various checks and also take care of moving data between
* user space and kernel space.
*/
static inline int ioctl_standard_call(struct net_device * dev,
struct ifreq * ifr,
unsigned int cmd,
iw_handler handler)
{
struct iwreq * iwr = (struct iwreq *) ifr;
const struct iw_ioctl_description * descr;
struct iw_request_info info;
int ret = -EINVAL;
/* Get the description of the IOCTL */
if((cmd - SIOCIWFIRST) >= standard_ioctl_num)
return -EOPNOTSUPP;
descr = &(standard_ioctl[cmd - SIOCIWFIRST]);
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Found standard handler for 0x%04X\n",
ifr->ifr_name, cmd);
printk(KERN_DEBUG "%s (WE) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens);
#endif /* WE_IOCTL_DEBUG */
/* Prepare the call */
info.cmd = cmd;
info.flags = 0;
/* Check if we have a pointer to user space data or not */
if(descr->header_type != IW_HEADER_TYPE_POINT) {
/* No extra arguments. Trivial to handle */
ret = handler(dev, &info, &(iwr->u), NULL);
#ifdef WE_SET_EVENT
/* Generate an event to notify listeners of the change */
if((descr->flags & IW_DESCR_FLAG_EVENT) &&
((ret == 0) || (ret == -EIWCOMMIT)))
wireless_send_event(dev, cmd, &(iwr->u), NULL);
#endif /* WE_SET_EVENT */
} else {
char * extra;
int extra_size;
int user_length = 0;
int err;
/* Calculate space needed by arguments. Always allocate
* for max space. Easier, and won't last long... */
extra_size = descr->max_tokens * descr->token_size;
/* Check what user space is giving us */
if(IW_IS_SET(cmd)) {
/* Check NULL pointer */
if((iwr->u.data.pointer == NULL) &&
(iwr->u.data.length != 0))
return -EFAULT;
/* Check if number of token fits within bounds */
if(iwr->u.data.length > descr->max_tokens)
return -E2BIG;
if(iwr->u.data.length < descr->min_tokens)
return -EINVAL;
} else {
/* Check NULL pointer */
if(iwr->u.data.pointer == NULL)
return -EFAULT;
/* Save user space buffer size for checking */
user_length = iwr->u.data.length;
/* Don't check if user_length > max to allow forward
* compatibility. The test user_length < min is
* implied by the test at the end. */
/* Support for very large requests */
if((descr->flags & IW_DESCR_FLAG_NOMAX) &&
(user_length > descr->max_tokens)) {
/* Allow userspace to GET more than max so
* we can support any size GET requests.
* There is still a limit : -ENOMEM. */
extra_size = user_length * descr->token_size;
/* Note : user_length is originally a __u16,
* and token_size is controlled by us,
* so extra_size won't get negative and
* won't overflow... */
}
}
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
dev->name, extra_size);
#endif /* WE_IOCTL_DEBUG */
/* Create the kernel buffer */
extra = kmalloc(extra_size, GFP_KERNEL);
if (extra == NULL) {
return -ENOMEM;
}
/* If it is a SET, get all the extra data in here */
if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
err = copy_from_user(extra, iwr->u.data.pointer,
iwr->u.data.length *
descr->token_size);
if (err) {
kfree(extra);
return -EFAULT;
}
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Got %d bytes\n",
dev->name,
iwr->u.data.length * descr->token_size);
#endif /* WE_IOCTL_DEBUG */
}
/* Call the handler */
ret = handler(dev, &info, &(iwr->u), extra);
/* If we have something to return to the user */
if (!ret && IW_IS_GET(cmd)) {
/* Check if there is enough buffer up there */
if(user_length < iwr->u.data.length) {
kfree(extra);
return -E2BIG;
}
err = copy_to_user(iwr->u.data.pointer, extra,
iwr->u.data.length *
descr->token_size);
if (err)
ret = -EFAULT;
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Wrote %d bytes\n",
dev->name,
iwr->u.data.length * descr->token_size);
#endif /* WE_IOCTL_DEBUG */
}
#ifdef WE_SET_EVENT
/* Generate an event to notify listeners of the change */
if((descr->flags & IW_DESCR_FLAG_EVENT) &&
((ret == 0) || (ret == -EIWCOMMIT))) {
if(descr->flags & IW_DESCR_FLAG_RESTRICT)
/* If the event is restricted, don't
* export the payload */
wireless_send_event(dev, cmd, &(iwr->u), NULL);
else
wireless_send_event(dev, cmd, &(iwr->u),
extra);
}
#endif /* WE_SET_EVENT */
/* Cleanup - I told you it wasn't that long ;-) */
kfree(extra);
}
/* Call commit handler if needed and defined */
if(ret == -EIWCOMMIT)
ret = call_commit_handler(dev);
/* Here, we will generate the appropriate event if needed */
return ret;
}
/* ---------------------------------------------------------------- */
/*
* Wrapper to call a private Wireless Extension handler.
* We do various checks and also take care of moving data between
* user space and kernel space.
* It's not as nice and slimline as the standard wrapper. The cause
* is struct iw_priv_args, which was not really designed for the
* job we are going here.
*
* IMPORTANT : This function prevent to set and get data on the same
* IOCTL and enforce the SET/GET convention. Not doing it would be
* far too hairy...
* If you need to set and get data at the same time, please don't use
* a iw_handler but process it in your ioctl handler (i.e. use the
* old driver API).
*/
static inline int ioctl_private_call(struct net_device * dev,
struct ifreq * ifr,
unsigned int cmd,
iw_handler handler)
{
struct iwreq * iwr = (struct iwreq *) ifr;
const struct iw_priv_args * descr = NULL;
struct iw_request_info info;
int extra_size = 0;
int i;
int ret = -EINVAL;
/* Get the description of the IOCTL */
for(i = 0; i < dev->wireless_handlers->num_private_args; i++)
if(cmd == dev->wireless_handlers->private_args[i].cmd) {
descr = &(dev->wireless_handlers->private_args[i]);
break;
}
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Found private handler for 0x%04X\n",
ifr->ifr_name, cmd);
if(descr) {
printk(KERN_DEBUG "%s (WE) : Name %s, set %X, get %X\n",
dev->name, descr->name,
descr->set_args, descr->get_args);
}
#endif /* WE_IOCTL_DEBUG */
/* Compute the size of the set/get arguments */
if(descr != NULL) {
if(IW_IS_SET(cmd)) {
int offset = 0; /* For sub-ioctls */
/* Check for sub-ioctl handler */
if(descr->name[0] == '\0')
/* Reserve one int for sub-ioctl index */
offset = sizeof(__u32);
/* Size of set arguments */
extra_size = get_priv_size(descr->set_args);
/* Does it fits in iwr ? */
if((descr->set_args & IW_PRIV_SIZE_FIXED) &&
((extra_size + offset) <= IFNAMSIZ))
extra_size = 0;
} else {
/* Size of get arguments */
extra_size = get_priv_size(descr->get_args);
/* Does it fits in iwr ? */
if((descr->get_args & IW_PRIV_SIZE_FIXED) &&
(extra_size <= IFNAMSIZ))
extra_size = 0;
}
}
/* Prepare the call */
info.cmd = cmd;
info.flags = 0;
/* Check if we have a pointer to user space data or not. */
if(extra_size == 0) {
/* No extra arguments. Trivial to handle */
ret = handler(dev, &info, &(iwr->u), (char *) &(iwr->u));
} else {
char * extra;
int err;
/* Check what user space is giving us */
if(IW_IS_SET(cmd)) {
/* Check NULL pointer */
if((iwr->u.data.pointer == NULL) &&
(iwr->u.data.length != 0))
return -EFAULT;
/* Does it fits within bounds ? */
if(iwr->u.data.length > (descr->set_args &
IW_PRIV_SIZE_MASK))
return -E2BIG;
} else {
/* Check NULL pointer */
if(iwr->u.data.pointer == NULL)
return -EFAULT;
}
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Malloc %d bytes\n",
dev->name, extra_size);
#endif /* WE_IOCTL_DEBUG */
/* Always allocate for max space. Easier, and won't last
* long... */
extra = kmalloc(extra_size, GFP_KERNEL);
if (extra == NULL) {
return -ENOMEM;
}
/* If it is a SET, get all the extra data in here */
if(IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
err = copy_from_user(extra, iwr->u.data.pointer,
extra_size);
if (err) {
kfree(extra);
return -EFAULT;
}
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Got %d elem\n",
dev->name, iwr->u.data.length);
#endif /* WE_IOCTL_DEBUG */
}
/* Call the handler */
ret = handler(dev, &info, &(iwr->u), extra);
/* If we have something to return to the user */
if (!ret && IW_IS_GET(cmd)) {
/* Adjust for the actual length if it's variable,
* avoid leaking kernel bits outside. */
if (!(descr->get_args & IW_PRIV_SIZE_FIXED)) {
extra_size = adjust_priv_size(descr->get_args,
&(iwr->u));
}
err = copy_to_user(iwr->u.data.pointer, extra,
extra_size);
if (err)
ret = -EFAULT;
#ifdef WE_IOCTL_DEBUG
printk(KERN_DEBUG "%s (WE) : Wrote %d elem\n",
dev->name, iwr->u.data.length);
#endif /* WE_IOCTL_DEBUG */
}
/* Cleanup - I told you it wasn't that long ;-) */
kfree(extra);
}
/* Call commit handler if needed and defined */
if(ret == -EIWCOMMIT)
ret = call_commit_handler(dev);
return ret;
}
/* ---------------------------------------------------------------- */
/*
* Main IOCTl dispatcher. Called from the main networking code
* (dev_ioctl() in net/core/dev.c).
* Check the type of IOCTL and call the appropriate wrapper...
*/
int wireless_process_ioctl(struct ifreq *ifr, unsigned int cmd)
{
struct net_device *dev;
iw_handler handler;
/* Permissions are already checked in dev_ioctl() before calling us.
* The copy_to/from_user() of ifr is also dealt with in there */
/* Make sure the device exist */
if ((dev = __dev_get_by_name(ifr->ifr_name)) == NULL)
return -ENODEV;
/* A bunch of special cases, then the generic case...
* Note that 'cmd' is already filtered in dev_ioctl() with
* (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
switch(cmd)
{
case SIOCGIWSTATS:
/* Get Wireless Stats */
return dev_iwstats(dev, ifr);
case SIOCGIWPRIV:
/* Check if we have some wireless handlers defined */
if(dev->wireless_handlers != NULL) {
/* We export to user space the definition of
* the private handler ourselves */
return ioctl_export_private(dev, ifr);
}
// ## Fall-through for old API ##
default:
/* Generic IOCTL */
/* Basic check */
if (!netif_device_present(dev))
return -ENODEV;
/* New driver API : try to find the handler */
handler = get_handler(dev, cmd);
if(handler != NULL) {
/* Standard and private are not the same */
if(cmd < SIOCIWFIRSTPRIV)
return ioctl_standard_call(dev,
ifr,
cmd,
handler);
else
return ioctl_private_call(dev,
ifr,
cmd,
handler);
}
/* Old driver API : call driver ioctl handler */
if (dev->do_ioctl) {
return dev->do_ioctl(dev, ifr, cmd);
}
return -EOPNOTSUPP;
}
/* Not reached */
return -EINVAL;
}
/************************* EVENT PROCESSING *************************/
/*
* Process events generated by the wireless layer or the driver.
* Most often, the event will be propagated through rtnetlink
*/
#ifdef WE_EVENT_NETLINK
/* "rtnl" is defined in net/core/rtnetlink.c, but we need it here.
* It is declared in <linux/rtnetlink.h> */
/* ---------------------------------------------------------------- */
/*
* Fill a rtnetlink message with our event data.
* Note that we propage only the specified event and don't dump the
* current wireless config. Dumping the wireless config is far too
* expensive (for each parameter, the driver need to query the hardware).
*/
static inline int rtnetlink_fill_iwinfo(struct sk_buff * skb,
struct net_device * dev,
int type,
char * event,
int event_len)
{
struct ifinfomsg *r;
struct nlmsghdr *nlh;
unsigned char *b = skb->tail;
nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(*r));
r = NLMSG_DATA(nlh);
r->ifi_family = AF_UNSPEC;
r->ifi_type = dev->type;
r->ifi_index = dev->ifindex;
r->ifi_flags = dev->flags;
r->ifi_change = 0; /* Wireless changes don't affect those flags */
/* Add the wireless events in the netlink packet */
RTA_PUT(skb, IFLA_WIRELESS,
event_len, event);
nlh->nlmsg_len = skb->tail - b;
return skb->len;
nlmsg_failure:
rtattr_failure:
skb_trim(skb, b - skb->data);
return -1;
}
/* ---------------------------------------------------------------- */
/*
* Create and broadcast and send it on the standard rtnetlink socket
* This is a pure clone rtmsg_ifinfo() in net/core/rtnetlink.c
* Andrzej Krzysztofowicz mandated that I used a IFLA_XXX field
* within a RTM_NEWLINK event.
*/
static inline void rtmsg_iwinfo(struct net_device * dev,
char * event,
int event_len)
{
struct sk_buff *skb;
int size = NLMSG_GOODSIZE;
skb = alloc_skb(size, GFP_ATOMIC);
if (!skb)
return;
if (rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK,
event, event_len) < 0) {
kfree_skb(skb);
return;
}
NETLINK_CB(skb).dst_groups = RTMGRP_LINK;
netlink_broadcast(rtnl, skb, 0, RTMGRP_LINK, GFP_ATOMIC);
}
#endif /* WE_EVENT_NETLINK */
/* ---------------------------------------------------------------- */
/*
* Main event dispatcher. Called from other parts and drivers.
* Send the event on the appropriate channels.
* May be called from interrupt context.
*/
void wireless_send_event(struct net_device * dev,
unsigned int cmd,
union iwreq_data * wrqu,
char * extra)
{
const struct iw_ioctl_description * descr = NULL;
int extra_len = 0;
struct iw_event *event; /* Mallocated whole event */
int event_len; /* Its size */
int hdr_len; /* Size of the event header */
/* Don't "optimise" the following variable, it will crash */
unsigned cmd_index; /* *MUST* be unsigned */
/* Get the description of the IOCTL */
if(cmd <= SIOCIWLAST) {
cmd_index = cmd - SIOCIWFIRST;
if(cmd_index < standard_ioctl_num)
descr = &(standard_ioctl[cmd_index]);
} else {
cmd_index = cmd - IWEVFIRST;
if(cmd_index < standard_event_num)
descr = &(standard_event[cmd_index]);
}
/* Don't accept unknown events */
if(descr == NULL) {
/* Note : we don't return an error to the driver, because
* the driver would not know what to do about it. It can't
* return an error to the user, because the event is not
* initiated by a user request.
* The best the driver could do is to log an error message.
* We will do it ourselves instead...
*/
printk(KERN_ERR "%s (WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
dev->name, cmd);
return;
}
#ifdef WE_EVENT_DEBUG
printk(KERN_DEBUG "%s (WE) : Got event 0x%04X\n",
dev->name, cmd);
printk(KERN_DEBUG "%s (WE) : Header type : %d, Token type : %d, size : %d, token : %d\n", dev->name, descr->header_type, descr->token_type, descr->token_size, descr->max_tokens);
#endif /* WE_EVENT_DEBUG */
/* Check extra parameters and set extra_len */
if(descr->header_type == IW_HEADER_TYPE_POINT) {
/* Check if number of token fits within bounds */
if(wrqu->data.length > descr->max_tokens) {
printk(KERN_ERR "%s (WE) : Wireless Event too big (%d)\n", dev->name, wrqu->data.length);
return;
}
if(wrqu->data.length < descr->min_tokens) {
printk(KERN_ERR "%s (WE) : Wireless Event too small (%d)\n", dev->name, wrqu->data.length);
return;
}
/* Calculate extra_len - extra is NULL for restricted events */
if(extra != NULL)
extra_len = wrqu->data.length * descr->token_size;
#ifdef WE_EVENT_DEBUG
printk(KERN_DEBUG "%s (WE) : Event 0x%04X, tokens %d, extra_len %d\n", dev->name, cmd, wrqu->data.length, extra_len);
#endif /* WE_EVENT_DEBUG */
}
/* Total length of the event */
hdr_len = event_type_size[descr->header_type];
event_len = hdr_len + extra_len;
#ifdef WE_EVENT_DEBUG
printk(KERN_DEBUG "%s (WE) : Event 0x%04X, hdr_len %d, event_len %d\n", dev->name, cmd, hdr_len, event_len);
#endif /* WE_EVENT_DEBUG */
/* Create temporary buffer to hold the event */
event = kmalloc(event_len, GFP_ATOMIC);
if(event == NULL)
return;
/* Fill event */
event->len = event_len;
event->cmd = cmd;
memcpy(&event->u, wrqu, hdr_len - IW_EV_LCP_LEN);
if(extra != NULL)
memcpy(((char *) event) + hdr_len, extra, extra_len);
#ifdef WE_EVENT_NETLINK
/* rtnetlink event channel */
rtmsg_iwinfo(dev, (char *) event, event_len);
#endif /* WE_EVENT_NETLINK */
/* Cleanup */
kfree(event);
return; /* Always success, I guess ;-) */
}
/********************** ENHANCED IWSPY SUPPORT **********************/
/*
* In the old days, the driver was handling spy support all by itself.
* Now, the driver can delegate this task to Wireless Extensions.
* It needs to use those standard spy iw_handler in struct iw_handler_def,
* push data to us via wireless_spy_update() and include struct iw_spy_data
* in its private part (and advertise it in iw_handler_def->spy_offset).
* One of the main advantage of centralising spy support here is that
* it becomes much easier to improve and extend it without having to touch
* the drivers. One example is the addition of the Spy-Threshold events.
*/
/* ---------------------------------------------------------------- */
/*
* Return the pointer to the spy data in the driver.
* Because this is called on the Rx path via wireless_spy_update(),
* we want it to be efficient...
*/
static inline struct iw_spy_data * get_spydata(struct net_device *dev)
{
/* This is the new way */
if(dev->wireless_data)
return(dev->wireless_data->spy_data);
/* This is the old way. Doesn't work for multi-headed drivers.
* It will be removed in the next version of WE. */
return (dev->priv + dev->wireless_handlers->spy_offset);
}
/*------------------------------------------------------------------*/
/*
* Standard Wireless Handler : set Spy List
*/
int iw_handler_set_spy(struct net_device * dev,
struct iw_request_info * info,
union iwreq_data * wrqu,
char * extra)
{
struct iw_spy_data * spydata = get_spydata(dev);
struct sockaddr * address = (struct sockaddr *) extra;
if(!dev->wireless_data)
/* Help user know that driver needs updating */
printk(KERN_DEBUG "%s (WE) : Driver using old/buggy spy support, please fix driver !\n",
dev->name);
/* Make sure driver is not buggy or using the old API */
if(!spydata)
return -EOPNOTSUPP;
/* Disable spy collection while we copy the addresses.
* While we copy addresses, any call to wireless_spy_update()
* will NOP. This is OK, as anyway the addresses are changing. */
spydata->spy_number = 0;
/* We want to operate without locking, because wireless_spy_update()
* most likely will happen in the interrupt handler, and therefore
* have its own locking constraints and needs performance.
* The rtnl_lock() make sure we don't race with the other iw_handlers.
* This make sure wireless_spy_update() "see" that the spy list
* is temporarily disabled. */
wmb();
/* Are there are addresses to copy? */
if(wrqu->data.length > 0) {
int i;
/* Copy addresses */
for(i = 0; i < wrqu->data.length; i++)
memcpy(spydata->spy_address[i], address[i].sa_data,
ETH_ALEN);
/* Reset stats */
memset(spydata->spy_stat, 0,
sizeof(struct iw_quality) * IW_MAX_SPY);
#ifdef WE_SPY_DEBUG
printk(KERN_DEBUG "iw_handler_set_spy() : offset %ld, spydata %p, num %d\n", dev->wireless_handlers->spy_offset, spydata, wrqu->data.length);
for (i = 0; i < wrqu->data.length; i++)
printk(KERN_DEBUG
"%02X:%02X:%02X:%02X:%02X:%02X \n",
spydata->spy_address[i][0],
spydata->spy_address[i][1],
spydata->spy_address[i][2],
spydata->spy_address[i][3],
spydata->spy_address[i][4],
spydata->spy_address[i][5]);
#endif /* WE_SPY_DEBUG */
}
/* Make sure above is updated before re-enabling */
wmb();
/* Enable addresses */
spydata->spy_number = wrqu->data.length;
return 0;
}
/*------------------------------------------------------------------*/
/*
* Standard Wireless Handler : get Spy List
*/
int iw_handler_get_spy(struct net_device * dev,
struct iw_request_info * info,
union iwreq_data * wrqu,
char * extra)
{
struct iw_spy_data * spydata = get_spydata(dev);
struct sockaddr * address = (struct sockaddr *) extra;
int i;
/* Make sure driver is not buggy or using the old API */
if(!spydata)
return -EOPNOTSUPP;
wrqu->data.length = spydata->spy_number;
/* Copy addresses. */
for(i = 0; i < spydata->spy_number; i++) {
memcpy(address[i].sa_data, spydata->spy_address[i], ETH_ALEN);
address[i].sa_family = AF_UNIX;
}
/* Copy stats to the user buffer (just after). */
if(spydata->spy_number > 0)
memcpy(extra + (sizeof(struct sockaddr) *spydata->spy_number),
spydata->spy_stat,
sizeof(struct iw_quality) * spydata->spy_number);
/* Reset updated flags. */
for(i = 0; i < spydata->spy_number; i++)
spydata->spy_stat[i].updated = 0;
return 0;
}
/*------------------------------------------------------------------*/
/*
* Standard Wireless Handler : set spy threshold
*/
int iw_handler_set_thrspy(struct net_device * dev,
struct iw_request_info *info,
union iwreq_data * wrqu,
char * extra)
{
struct iw_spy_data * spydata = get_spydata(dev);
struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
/* Make sure driver is not buggy or using the old API */
if(!spydata)
return -EOPNOTSUPP;
/* Just do it */
memcpy(&(spydata->spy_thr_low), &(threshold->low),
2 * sizeof(struct iw_quality));
/* Clear flag */
memset(spydata->spy_thr_under, '\0', sizeof(spydata->spy_thr_under));
#ifdef WE_SPY_DEBUG
printk(KERN_DEBUG "iw_handler_set_thrspy() : low %d ; high %d\n", spydata->spy_thr_low.level, spydata->spy_thr_high.level);
#endif /* WE_SPY_DEBUG */
return 0;
}
/*------------------------------------------------------------------*/
/*
* Standard Wireless Handler : get spy threshold
*/
int iw_handler_get_thrspy(struct net_device * dev,
struct iw_request_info *info,
union iwreq_data * wrqu,
char * extra)
{
struct iw_spy_data * spydata = get_spydata(dev);
struct iw_thrspy * threshold = (struct iw_thrspy *) extra;
/* Make sure driver is not buggy or using the old API */
if(!spydata)
return -EOPNOTSUPP;
/* Just do it */
memcpy(&(threshold->low), &(spydata->spy_thr_low),
2 * sizeof(struct iw_quality));
return 0;
}
/*------------------------------------------------------------------*/
/*
* Prepare and send a Spy Threshold event
*/
static void iw_send_thrspy_event(struct net_device * dev,
struct iw_spy_data * spydata,
unsigned char * address,
struct iw_quality * wstats)
{
union iwreq_data wrqu;
struct iw_thrspy threshold;
/* Init */
wrqu.data.length = 1;
wrqu.data.flags = 0;
/* Copy address */
memcpy(threshold.addr.sa_data, address, ETH_ALEN);
threshold.addr.sa_family = ARPHRD_ETHER;
/* Copy stats */
memcpy(&(threshold.qual), wstats, sizeof(struct iw_quality));
/* Copy also thresholds */
memcpy(&(threshold.low), &(spydata->spy_thr_low),
2 * sizeof(struct iw_quality));
#ifdef WE_SPY_DEBUG
printk(KERN_DEBUG "iw_send_thrspy_event() : address %02X:%02X:%02X:%02X:%02X:%02X, level %d, up = %d\n",
threshold.addr.sa_data[0],
threshold.addr.sa_data[1],
threshold.addr.sa_data[2],
threshold.addr.sa_data[3],
threshold.addr.sa_data[4],
threshold.addr.sa_data[5], threshold.qual.level);
#endif /* WE_SPY_DEBUG */
/* Send event to user space */
wireless_send_event(dev, SIOCGIWTHRSPY, &wrqu, (char *) &threshold);
}
/* ---------------------------------------------------------------- */
/*
* Call for the driver to update the spy data.
* For now, the spy data is a simple array. As the size of the array is
* small, this is good enough. If we wanted to support larger number of
* spy addresses, we should use something more efficient...
*/
void wireless_spy_update(struct net_device * dev,
unsigned char * address,
struct iw_quality * wstats)
{
struct iw_spy_data * spydata = get_spydata(dev);
int i;
int match = -1;
/* Make sure driver is not buggy or using the old API */
if(!spydata)
return;
#ifdef WE_SPY_DEBUG
printk(KERN_DEBUG "wireless_spy_update() : offset %ld, spydata %p, address %02X:%02X:%02X:%02X:%02X:%02X\n", dev->wireless_handlers->spy_offset, spydata, address[0], address[1], address[2], address[3], address[4], address[5]);
#endif /* WE_SPY_DEBUG */
/* Update all records that match */
for(i = 0; i < spydata->spy_number; i++)
if(!memcmp(address, spydata->spy_address[i], ETH_ALEN)) {
memcpy(&(spydata->spy_stat[i]), wstats,
sizeof(struct iw_quality));
match = i;
}
/* Generate an event if we cross the spy threshold.
* To avoid event storms, we have a simple hysteresis : we generate
* event only when we go under the low threshold or above the
* high threshold. */
if(match >= 0) {
if(spydata->spy_thr_under[match]) {
if(wstats->level > spydata->spy_thr_high.level) {
spydata->spy_thr_under[match] = 0;
iw_send_thrspy_event(dev, spydata,
address, wstats);
}
} else {
if(wstats->level < spydata->spy_thr_low.level) {
spydata->spy_thr_under[match] = 1;
iw_send_thrspy_event(dev, spydata,
address, wstats);
}
}
}
}
EXPORT_SYMBOL(iw_handler_get_spy);
EXPORT_SYMBOL(iw_handler_get_thrspy);
EXPORT_SYMBOL(iw_handler_set_spy);
EXPORT_SYMBOL(iw_handler_set_thrspy);
EXPORT_SYMBOL(wireless_send_event);
EXPORT_SYMBOL(wireless_spy_update);