232 lines
6.5 KiB
C
232 lines
6.5 KiB
C
/*
|
|
* This file implement the Wireless Extensions spy API.
|
|
*
|
|
* 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)
|
|
*/
|
|
|
|
#include <linux/wireless.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <net/iw_handler.h>
|
|
#include <net/arp.h>
|
|
#include <net/wext.h>
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
|
|
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);
|