mirror of https://gitee.com/openkylin/linux.git
1508 lines
44 KiB
C
1508 lines
44 KiB
C
/*
|
|
* 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 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];
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* 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 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]);
|
|
|
|
/* 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);
|
|
|
|
/* 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);
|
|
} else {
|
|
char * extra;
|
|
int extra_size;
|
|
int user_length = 0;
|
|
int err;
|
|
int essid_compat = 0;
|
|
|
|
/* 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 need for ESSID compatibility for WE < 21 */
|
|
switch (cmd) {
|
|
case SIOCSIWESSID:
|
|
case SIOCGIWESSID:
|
|
case SIOCSIWNICKN:
|
|
case SIOCGIWNICKN:
|
|
if (iwr->u.data.length == descr->max_tokens + 1)
|
|
essid_compat = 1;
|
|
else if (IW_IS_SET(cmd) && (iwr->u.data.length != 0)) {
|
|
char essid[IW_ESSID_MAX_SIZE + 1];
|
|
|
|
err = copy_from_user(essid, iwr->u.data.pointer,
|
|
iwr->u.data.length *
|
|
descr->token_size);
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
if (essid[iwr->u.data.length - 1] == '\0')
|
|
essid_compat = 1;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
iwr->u.data.length -= essid_compat;
|
|
|
|
/* 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... */
|
|
}
|
|
}
|
|
|
|
/* Create the kernel buffer */
|
|
/* kzalloc ensures NULL-termination for essid_compat */
|
|
extra = kzalloc(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;
|
|
}
|
|
}
|
|
|
|
/* Call the handler */
|
|
ret = handler(dev, &info, &(iwr->u), extra);
|
|
|
|
iwr->u.data.length += essid_compat;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
|
|
/* 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 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;
|
|
}
|
|
|
|
/* 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 if (iwr->u.data.pointer == NULL)
|
|
return -EFAULT;
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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.
|
|
* Check the type of IOCTL and call the appropriate wrapper...
|
|
*/
|
|
static int wireless_process_ioctl(struct net *net, 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(net, 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) */
|
|
if (cmd == SIOCGIWSTATS)
|
|
return ioctl_standard_call(dev, ifr, cmd,
|
|
&iw_handler_get_iwstats);
|
|
|
|
if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
|
|
return ioctl_standard_call(dev, ifr, cmd,
|
|
&iw_handler_get_private);
|
|
|
|
/* Basic check */
|
|
if (!netif_device_present(dev))
|
|
return -ENODEV;
|
|
|
|
/* New driver API : try to find the handler */
|
|
handler = get_handler(dev, cmd);
|
|
if (handler) {
|
|
/* 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;
|
|
}
|
|
|
|
/* entry point from dev ioctl */
|
|
int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
|
|
void __user *arg)
|
|
{
|
|
int ret;
|
|
|
|
/* If command is `set a parameter', or
|
|
* `get the encoding parameters', check if
|
|
* the user has the right to do it */
|
|
if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE || cmd == SIOCGIWENCODEEXT)
|
|
&& !capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
dev_load(net, ifr->ifr_name);
|
|
rtnl_lock();
|
|
ret = wireless_process_ioctl(net, ifr, cmd);
|
|
rtnl_unlock();
|
|
if (IW_IS_GET(cmd) && copy_to_user(arg, ifr, sizeof(struct iwreq)))
|
|
return -EFAULT;
|
|
return ret;
|
|
}
|
|
|
|
/************************* EVENT PROCESSING *************************/
|
|
/*
|
|
* Process events generated by the wireless layer or the driver.
|
|
* Most often, the event will be propagated through rtnetlink
|
|
*/
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* Locking...
|
|
* ----------
|
|
*
|
|
* Thanks to Herbert Xu <herbert@gondor.apana.org.au> for fixing
|
|
* the locking issue in here and implementing this code !
|
|
*
|
|
* The issue : wireless_send_event() is often called in interrupt context,
|
|
* while the Netlink layer can never be called in interrupt context.
|
|
* The fully formed RtNetlink events are queued, and then a tasklet is run
|
|
* to feed those to Netlink.
|
|
* The skb_queue is interrupt safe, and its lock is not held while calling
|
|
* Netlink, so there is no possibility of dealock.
|
|
* Jean II
|
|
*/
|
|
|
|
static struct sk_buff_head wireless_nlevent_queue;
|
|
|
|
static int __init wireless_nlevent_init(void)
|
|
{
|
|
skb_queue_head_init(&wireless_nlevent_queue);
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(wireless_nlevent_init);
|
|
|
|
static void wireless_nlevent_process(unsigned long data)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = skb_dequeue(&wireless_nlevent_queue)))
|
|
rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
|
|
}
|
|
|
|
static DECLARE_TASKLET(wireless_nlevent_tasklet, wireless_nlevent_process, 0);
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* 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 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;
|
|
|
|
nlh = nlmsg_put(skb, 0, 0, type, sizeof(*r), 0);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
r = nlmsg_data(nlh);
|
|
r->ifi_family = AF_UNSPEC;
|
|
r->__ifi_pad = 0;
|
|
r->ifi_type = dev->type;
|
|
r->ifi_index = dev->ifindex;
|
|
r->ifi_flags = dev_get_flags(dev);
|
|
r->ifi_change = 0; /* Wireless changes don't affect those flags */
|
|
|
|
/* Add the wireless events in the netlink packet */
|
|
NLA_PUT(skb, IFLA_WIRELESS, event_len, event);
|
|
|
|
return nlmsg_end(skb, nlh);
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* 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 void rtmsg_iwinfo(struct net_device *dev, char *event, int event_len)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
if (dev_net(dev) != &init_net)
|
|
return;
|
|
|
|
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
|
|
if (!skb)
|
|
return;
|
|
|
|
err = rtnetlink_fill_iwinfo(skb, dev, RTM_NEWLINK, event, event_len);
|
|
if (err < 0) {
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
|
|
NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
|
|
skb_queue_tail(&wireless_nlevent_queue, skb);
|
|
tasklet_schedule(&wireless_nlevent_tasklet);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------- */
|
|
/*
|
|
* 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 */
|
|
int wrqu_off = 0; /* Offset in wrqu */
|
|
/* Don't "optimise" the following variable, it will crash */
|
|
unsigned cmd_index; /* *MUST* be unsigned */
|
|
|
|
/* Get the description of the Event */
|
|
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;
|
|
}
|
|
|
|
/* 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;
|
|
/* Always at an offset in wrqu */
|
|
wrqu_off = IW_EV_POINT_OFF;
|
|
}
|
|
|
|
/* Total length of the event */
|
|
hdr_len = event_type_size[descr->header_type];
|
|
event_len = hdr_len + extra_len;
|
|
|
|
/* 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, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
|
|
if (extra)
|
|
memcpy(((char *) event) + hdr_len, extra, extra_len);
|
|
|
|
/* Send via the RtNetlink event channel */
|
|
rtmsg_iwinfo(dev, (char *) event, event_len);
|
|
|
|
/* Cleanup */
|
|
kfree(event);
|
|
|
|
return; /* Always success, I guess ;-) */
|
|
}
|
|
EXPORT_SYMBOL(wireless_send_event);
|
|
|
|
/********************** 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 export it in net_device->wireless_data->spy_data).
|
|
* 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;
|
|
return NULL;
|
|
}
|
|
|
|
/*------------------------------------------------------------------*/
|
|
/*
|
|
* 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;
|
|
|
|
/* 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. */
|
|
smp_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);
|
|
}
|
|
|
|
/* Make sure above is updated before re-enabling */
|
|
smp_wmb();
|
|
|
|
/* Enable addresses */
|
|
spydata->spy_number = wrqu->data.length;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iw_handler_set_spy);
|
|
|
|
/*------------------------------------------------------------------*/
|
|
/*
|
|
* 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 &= ~IW_QUAL_ALL_UPDATED;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iw_handler_get_spy);
|
|
|
|
/*------------------------------------------------------------------*/
|
|
/*
|
|
* 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));
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iw_handler_set_thrspy);
|
|
|
|
/*------------------------------------------------------------------*/
|
|
/*
|
|
* 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;
|
|
}
|
|
EXPORT_SYMBOL(iw_handler_get_thrspy);
|
|
|
|
/*------------------------------------------------------------------*/
|
|
/*
|
|
* 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));
|
|
|
|
/* 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;
|
|
|
|
/* Update all records that match */
|
|
for (i = 0; i < spydata->spy_number; i++)
|
|
if (!compare_ether_addr(address, spydata->spy_address[i])) {
|
|
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(wireless_spy_update);
|