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wext.c
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wext.c
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/*
* This file implement the Wireless Extensions APIs.
*
* Authors : Jean Tourrilhes - HPL - <[email protected]>
* 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 <[email protected]> :
* 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;
}