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2638fed7cc
linux/net/ieee80211/softmac/ieee80211softmac_wx.c
David Woodhouse 2638fed7cc [PATCH] softmac: reduce default rate to 11Mbps. 
We don't make much of an attempt to fall back to lower rates, and 54M
just isn't reliable enough for many people. In fact, it's not clear we
even set it to 11M if we're trying to associate with an 802.11b AP.

This patch makes us default to 11M, which ought to work for most people.
When we actually handle dynamic rate adjustment, we can reconsider the
defaults -- but even then, probably it makes as much sense to start at
11M and adjust it upwards as it does to start at 54M and reduce it.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2006-03-27 14:04:13 -05:00

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/*
* This file contains our _wx handlers. Make sure you EXPORT_SYMBOL_GPL them
*
* Copyright (c) 2005, 2006 Johannes Berg <johannes@sipsolutions.net>
* Joseph Jezak <josejx@gentoo.org>
* Larry Finger <Larry.Finger@lwfinger.net>
* Danny van Dyk <kugelfang@gentoo.org>
* Michael Buesch <mbuesch@freenet.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* The full GNU General Public License is included in this distribution in the
* file called COPYING.
*/
#include "ieee80211softmac_priv.h"
#include <net/iw_handler.h>
int
ieee80211softmac_wx_trigger_scan(struct net_device *net_dev,
struct iw_request_info *info,
union iwreq_data *data,
char *extra)
{
struct ieee80211softmac_device *sm = ieee80211_priv(net_dev);
return ieee80211softmac_start_scan(sm);
}
EXPORT_SYMBOL_GPL(ieee80211softmac_wx_trigger_scan);
int
ieee80211softmac_wx_get_scan_results(struct net_device *net_dev,
struct iw_request_info *info,
union iwreq_data *data,
char *extra)
{
struct ieee80211softmac_device *sm = ieee80211_priv(net_dev);
return ieee80211_wx_get_scan(sm->ieee, info, data, extra);
}
EXPORT_SYMBOL_GPL(ieee80211softmac_wx_get_scan_results);
int
ieee80211softmac_wx_set_essid(struct net_device *net_dev,
struct iw_request_info *info,
union iwreq_data *data,
char *extra)
{
struct ieee80211softmac_device *sm = ieee80211_priv(net_dev);
int length = 0;
unsigned long flags;
spin_lock_irqsave(&sm->lock, flags);
sm->associnfo.static_essid = 0;
if (data->essid.flags && data->essid.length && extra /*required?*/) {
length = min(data->essid.length - 1, IW_ESSID_MAX_SIZE);
if (length) {
memcpy(sm->associnfo.req_essid.data, extra, length);
sm->associnfo.static_essid = 1;
}
}
sm->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT;
/* set our requested ESSID length.
* If applicable, we have already copied the data in */
sm->associnfo.req_essid.len = length;
/* queue lower level code to do work (if necessary) */
schedule_work(&sm->associnfo.work);
spin_unlock_irqrestore(&sm->lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(ieee80211softmac_wx_set_essid);
int
ieee80211softmac_wx_get_essid(struct net_device *net_dev,
struct iw_request_info *info,
union iwreq_data *data,
char *extra)
{
struct ieee80211softmac_device *sm = ieee80211_priv(net_dev);
unsigned long flags;
/* avoid getting inconsistent information */
spin_lock_irqsave(&sm->lock, flags);
/* If all fails, return ANY (empty) */
data->essid.length = 0;
data->essid.flags = 0; /* active */
/* If we have a statically configured ESSID then return it */
if (sm->associnfo.static_essid) {
data->essid.length = sm->associnfo.req_essid.len;
data->essid.flags = 1; /* active */
memcpy(extra, sm->associnfo.req_essid.data, sm->associnfo.req_essid.len);
}
/* If we're associating/associated, return that */
if (sm->associated || sm->associnfo.associating) {
data->essid.length = sm->associnfo.associate_essid.len;
data->essid.flags = 1; /* active */
memcpy(extra, sm->associnfo.associate_essid.data, sm->associnfo.associate_essid.len);
}
spin_unlock_irqrestore(&sm->lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(ieee80211softmac_wx_get_essid);
int
ieee80211softmac_wx_set_rate(struct net_device *net_dev,
struct iw_request_info *info,
union iwreq_data *data,
char *extra)
{
struct ieee80211softmac_device *mac = ieee80211_priv(net_dev);
struct ieee80211_device *ieee = mac->ieee;
unsigned long flags;
s32 in_rate = data->bitrate.value;
u8 rate;
int is_ofdm = 0;
int err = -EINVAL;
if (in_rate == -1) {
/* FIXME: We don't correctly handle backing down to lower
rates, so 801.11g devices start off at 11M for now. People
can manually change it if they really need to, but 11M is
more reliable. Note similar logic in
ieee80211softmac_wx_set_rate() */
if (ieee->modulation & IEEE80211_CCK_MODULATION)
in_rate = 11000000;
else
in_rate = 54000000;
}
switch (in_rate) {
case 1000000:
rate = IEEE80211_CCK_RATE_1MB;
break;
case 2000000:
rate = IEEE80211_CCK_RATE_2MB;
break;
case 5500000:
rate = IEEE80211_CCK_RATE_5MB;
break;
case 11000000:
rate = IEEE80211_CCK_RATE_11MB;
break;
case 6000000:
rate = IEEE80211_OFDM_RATE_6MB;
is_ofdm = 1;
break;
case 9000000:
rate = IEEE80211_OFDM_RATE_9MB;
is_ofdm = 1;
break;
case 12000000:
rate = IEEE80211_OFDM_RATE_12MB;
is_ofdm = 1;
break;
case 18000000:
rate = IEEE80211_OFDM_RATE_18MB;
is_ofdm = 1;
break;
case 24000000:
rate = IEEE80211_OFDM_RATE_24MB;
is_ofdm = 1;
break;
case 36000000:
rate = IEEE80211_OFDM_RATE_36MB;
is_ofdm = 1;
break;
case 48000000:
rate = IEEE80211_OFDM_RATE_48MB;
is_ofdm = 1;
break;
case 54000000:
rate = IEEE80211_OFDM_RATE_54MB;
is_ofdm = 1;
break;
default:
goto out;
}
spin_lock_irqsave(&mac->lock, flags);
/* Check if correct modulation for this PHY. */
if (is_ofdm && !(ieee->modulation & IEEE80211_OFDM_MODULATION))
goto out_unlock;
mac->txrates.default_rate = rate;
mac->txrates.default_fallback = lower_rate(mac, rate);
err = 0;
out_unlock:
spin_unlock_irqrestore(&mac->lock, flags);
out:
return err;
}
EXPORT_SYMBOL_GPL(ieee80211softmac_wx_set_rate);
int
ieee80211softmac_wx_get_rate(struct net_device *net_dev,
struct iw_request_info *info,
union iwreq_data *data,
char *extra)
{
struct ieee80211softmac_device *mac = ieee80211_priv(net_dev);
unsigned long flags;
int err = -EINVAL;
spin_lock_irqsave(&mac->lock, flags);
switch (mac->txrates.default_rate) {
case IEEE80211_CCK_RATE_1MB:
data->bitrate.value = 1000000;
break;
case IEEE80211_CCK_RATE_2MB:
data->bitrate.value = 2000000;
break;
case IEEE80211_CCK_RATE_5MB:
data->bitrate.value = 5500000;
break;
case IEEE80211_CCK_RATE_11MB:
data->bitrate.value = 11000000;
break;
case IEEE80211_OFDM_RATE_6MB:
data->bitrate.value = 6000000;
break;
case IEEE80211_OFDM_RATE_9MB:
data->bitrate.value = 9000000;
break;
case IEEE80211_OFDM_RATE_12MB:
data->bitrate.value = 12000000;
break;
case IEEE80211_OFDM_RATE_18MB:
data->bitrate.value = 18000000;
break;
case IEEE80211_OFDM_RATE_24MB:
data->bitrate.value = 24000000;
break;
case IEEE80211_OFDM_RATE_36MB:
data->bitrate.value = 36000000;
break;
case IEEE80211_OFDM_RATE_48MB:
data->bitrate.value = 48000000;
break;
case IEEE80211_OFDM_RATE_54MB:
data->bitrate.value = 54000000;
break;
default:
assert(0);
goto out_unlock;
}
err = 0;
out_unlock:
spin_unlock_irqrestore(&mac->lock, flags);
return err;
}
EXPORT_SYMBOL_GPL(ieee80211softmac_wx_get_rate);
int
ieee80211softmac_wx_get_wap(struct net_device *net_dev,
struct iw_request_info *info,
union iwreq_data *data,
char *extra)
{
struct ieee80211softmac_device *mac = ieee80211_priv(net_dev);
int err = 0;
unsigned long flags;
spin_lock_irqsave(&mac->lock, flags);
if (mac->associnfo.bssvalid)
memcpy(data->ap_addr.sa_data, mac->associnfo.bssid, ETH_ALEN);
else
memset(data->ap_addr.sa_data, 0xff, ETH_ALEN);
data->ap_addr.sa_family = ARPHRD_ETHER;
spin_unlock_irqrestore(&mac->lock, flags);
return err;
}
EXPORT_SYMBOL_GPL(ieee80211softmac_wx_get_wap);
int
ieee80211softmac_wx_set_wap(struct net_device *net_dev,
struct iw_request_info *info,
union iwreq_data *data,
char *extra)
{
struct ieee80211softmac_device *mac = ieee80211_priv(net_dev);
static const unsigned char any[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
static const unsigned char off[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
unsigned long flags;
/* sanity check */
if (data->ap_addr.sa_family != ARPHRD_ETHER) {
return -EINVAL;
}
spin_lock_irqsave(&mac->lock, flags);
if (!memcmp(any, data->ap_addr.sa_data, ETH_ALEN) ||
!memcmp(off, data->ap_addr.sa_data, ETH_ALEN)) {
schedule_work(&mac->associnfo.work);
goto out;
} else {
if (!memcmp(mac->associnfo.bssid, data->ap_addr.sa_data, ETH_ALEN)) {
if (mac->associnfo.associating || mac->associated) {
/* bssid unchanged and associated or associating - just return */
goto out;
}
} else {
/* copy new value in data->ap_addr.sa_data to bssid */
memcpy(mac->associnfo.bssid, data->ap_addr.sa_data, ETH_ALEN);
}
/* queue associate if new bssid or (old one again and not associated) */
schedule_work(&mac->associnfo.work);
}
out:
spin_unlock_irqrestore(&mac->lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(ieee80211softmac_wx_set_wap);
int
ieee80211softmac_wx_set_genie(struct net_device *dev,
struct iw_request_info *info,
union iwreq_data *wrqu,
char *extra)
{
struct ieee80211softmac_device *mac = ieee80211_priv(dev);
unsigned long flags;
int err = 0;
char *buf;
int i;
spin_lock_irqsave(&mac->lock, flags);
/* bleh. shouldn't be locked for that kmalloc... */
if (wrqu->data.length) {
if ((wrqu->data.length < 2) || (extra[1]+2 != wrqu->data.length)) {
/* this is an IE, so the length must be
* correct. Is it possible though that
* more than one IE is passed in?
*/
err = -EINVAL;
goto out;
}
if (mac->wpa.IEbuflen <= wrqu->data.length) {
buf = kmalloc(wrqu->data.length, GFP_ATOMIC);
if (!buf) {
err = -ENOMEM;
goto out;
}
kfree(mac->wpa.IE);
mac->wpa.IE = buf;
mac->wpa.IEbuflen = wrqu->data.length;
}
memcpy(mac->wpa.IE, extra, wrqu->data.length);
dprintk(KERN_INFO PFX "generic IE set to ");
for (i=0;i<wrqu->data.length;i++)
dprintk("%.2x", mac->wpa.IE[i]);
dprintk("\n");
mac->wpa.IElen = wrqu->data.length;
} else {
kfree(mac->wpa.IE);
mac->wpa.IE = NULL;
mac->wpa.IElen = 0;
mac->wpa.IEbuflen = 0;
}
out:
spin_unlock_irqrestore(&mac->lock, flags);
return err;
}
EXPORT_SYMBOL_GPL(ieee80211softmac_wx_set_genie);
int
ieee80211softmac_wx_get_genie(struct net_device *dev,
struct iw_request_info *info,
union iwreq_data *wrqu,
char *extra)
{
struct ieee80211softmac_device *mac = ieee80211_priv(dev);
unsigned long flags;
int err = 0;
int space = wrqu->data.length;
spin_lock_irqsave(&mac->lock, flags);
wrqu->data.length = 0;
if (mac->wpa.IE && mac->wpa.IElen) {
wrqu->data.length = mac->wpa.IElen;
if (mac->wpa.IElen <= space)
memcpy(extra, mac->wpa.IE, mac->wpa.IElen);
else
err = -E2BIG;
}
spin_unlock_irqrestore(&mac->lock, flags);
return err;
}
EXPORT_SYMBOL_GPL(ieee80211softmac_wx_get_genie);
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