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linux-sg2042/net/ieee80211/softmac/ieee80211softmac_module.c

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/*
* Contains some basic softmac functions along with module registration code etc.
*
* 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 <linux/sort.h>
#include <linux/etherdevice.h>
struct net_device *alloc_ieee80211softmac(int sizeof_priv)
{
struct ieee80211softmac_device *softmac;
struct net_device *dev;
dev = alloc_ieee80211(sizeof(struct ieee80211softmac_device) + sizeof_priv);
softmac = ieee80211_priv(dev);
softmac->dev = dev;
softmac->ieee = netdev_priv(dev);
spin_lock_init(&softmac->lock);
softmac->ieee->handle_auth = ieee80211softmac_auth_resp;
softmac->ieee->handle_deauth = ieee80211softmac_deauth_resp;
softmac->ieee->handle_assoc_response = ieee80211softmac_handle_assoc_response;
softmac->ieee->handle_reassoc_request = ieee80211softmac_handle_reassoc_req;
softmac->ieee->handle_disassoc = ieee80211softmac_handle_disassoc;
softmac->ieee->handle_beacon = ieee80211softmac_handle_beacon;
softmac->scaninfo = NULL;
softmac->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT;
/* TODO: initialise all the other callbacks in the ieee struct
* (once they're written)
*/
INIT_LIST_HEAD(&softmac->auth_queue);
INIT_LIST_HEAD(&softmac->network_list);
INIT_LIST_HEAD(&softmac->events);
mutex_init(&softmac->associnfo.mutex);
INIT_DELAYED_WORK(&softmac->associnfo.work, ieee80211softmac_assoc_work);
INIT_DELAYED_WORK(&softmac->associnfo.timeout, ieee80211softmac_assoc_timeout);
softmac->start_scan = ieee80211softmac_start_scan_implementation;
softmac->wait_for_scan = ieee80211softmac_wait_for_scan_implementation;
softmac->stop_scan = ieee80211softmac_stop_scan_implementation;
/* to start with, we can't send anything ... */
netif_carrier_off(dev);
return dev;
}
EXPORT_SYMBOL_GPL(alloc_ieee80211softmac);
/* Clears the pending work queue items, stops all scans, etc. */
void
ieee80211softmac_clear_pending_work(struct ieee80211softmac_device *sm)
{
unsigned long flags;
struct ieee80211softmac_event *eventptr, *eventtmp;
struct ieee80211softmac_auth_queue_item *authptr, *authtmp;
struct ieee80211softmac_network *netptr, *nettmp;
ieee80211softmac_stop_scan(sm);
ieee80211softmac_wait_for_scan(sm);
spin_lock_irqsave(&sm->lock, flags);
sm->running = 0;
/* Free all pending assoc work items */
cancel_delayed_work(&sm->associnfo.work);
/* Free all pending scan work items */
if(sm->scaninfo != NULL)
cancel_delayed_work(&sm->scaninfo->softmac_scan);
/* Free all pending auth work items */
list_for_each_entry(authptr, &sm->auth_queue, list)
cancel_delayed_work(&authptr->work);
/* delete all pending event calls and work items */
list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list)
cancel_delayed_work(&eventptr->work);
spin_unlock_irqrestore(&sm->lock, flags);
flush_scheduled_work();
/* now we should be save and no longer need locking... */
spin_lock_irqsave(&sm->lock, flags);
/* Free all pending auth work items */
list_for_each_entry_safe(authptr, authtmp, &sm->auth_queue, list) {
list_del(&authptr->list);
kfree(authptr);
}
/* delete all pending event calls and work items */
list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list) {
list_del(&eventptr->list);
kfree(eventptr);
}
/* Free all networks */
list_for_each_entry_safe(netptr, nettmp, &sm->network_list, list) {
ieee80211softmac_del_network_locked(sm, netptr);
if(netptr->challenge != NULL)
kfree(netptr->challenge);
kfree(netptr);
}
spin_unlock_irqrestore(&sm->lock, flags);
}
EXPORT_SYMBOL_GPL(ieee80211softmac_clear_pending_work);
void free_ieee80211softmac(struct net_device *dev)
{
struct ieee80211softmac_device *sm = ieee80211_priv(dev);
ieee80211softmac_clear_pending_work(sm);
kfree(sm->scaninfo);
kfree(sm->wpa.IE);
free_ieee80211(dev);
}
EXPORT_SYMBOL_GPL(free_ieee80211softmac);
static void ieee80211softmac_start_check_rates(struct ieee80211softmac_device *mac)
{
struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
/* I took out the sorting check, we're seperating by modulation now. */
if (ri->count)
return;
/* otherwise assume we hav'em all! */
if (mac->ieee->modulation & IEEE80211_CCK_MODULATION) {
ri->rates[ri->count++] = IEEE80211_CCK_RATE_1MB;
ri->rates[ri->count++] = IEEE80211_CCK_RATE_2MB;
ri->rates[ri->count++] = IEEE80211_CCK_RATE_5MB;
ri->rates[ri->count++] = IEEE80211_CCK_RATE_11MB;
}
if (mac->ieee->modulation & IEEE80211_OFDM_MODULATION) {
ri->rates[ri->count++] = IEEE80211_OFDM_RATE_6MB;
ri->rates[ri->count++] = IEEE80211_OFDM_RATE_9MB;
ri->rates[ri->count++] = IEEE80211_OFDM_RATE_12MB;
ri->rates[ri->count++] = IEEE80211_OFDM_RATE_18MB;
ri->rates[ri->count++] = IEEE80211_OFDM_RATE_24MB;
ri->rates[ri->count++] = IEEE80211_OFDM_RATE_36MB;
ri->rates[ri->count++] = IEEE80211_OFDM_RATE_48MB;
ri->rates[ri->count++] = IEEE80211_OFDM_RATE_54MB;
}
}
int ieee80211softmac_ratesinfo_rate_supported(struct ieee80211softmac_ratesinfo *ri, u8 rate)
{
int search;
u8 search_rate;
for (search = 0; search < ri->count; search++) {
search_rate = ri->rates[search];
search_rate &= ~IEEE80211_BASIC_RATE_MASK;
if (rate == search_rate)
return 1;
}
return 0;
}
u8 ieee80211softmac_highest_supported_rate(struct ieee80211softmac_device *mac,
struct ieee80211softmac_ratesinfo *ri, int basic_only)
{
u8 user_rate = mac->txrates.user_rate;
int i;
if (ri->count == 0)
return IEEE80211_CCK_RATE_1MB;
for (i = ri->count - 1; i >= 0; i--) {
u8 rate = ri->rates[i];
if (basic_only && !(rate & IEEE80211_BASIC_RATE_MASK))
continue;
rate &= ~IEEE80211_BASIC_RATE_MASK;
if (rate > user_rate)
continue;
if (ieee80211softmac_ratesinfo_rate_supported(&mac->ratesinfo, rate))
return rate;
}
/* If we haven't found a suitable rate by now, just trust the user */
return user_rate;
}
EXPORT_SYMBOL_GPL(ieee80211softmac_highest_supported_rate);
void ieee80211softmac_process_erp(struct ieee80211softmac_device *mac,
u8 erp_value)
{
int use_protection;
int short_preamble;
u32 changes = 0;
/* Barker preamble mode */
short_preamble = ((erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0
&& mac->associnfo.short_preamble_available) ? 1 : 0;
/* Protection needed? */
use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
if (mac->bssinfo.short_preamble != short_preamble) {
changes |= IEEE80211SOFTMAC_BSSINFOCHG_SHORT_PREAMBLE;
mac->bssinfo.short_preamble = short_preamble;
}
if (mac->bssinfo.use_protection != use_protection) {
changes |= IEEE80211SOFTMAC_BSSINFOCHG_PROTECTION;
mac->bssinfo.use_protection = use_protection;
}
if (mac->bssinfo_change && changes)
mac->bssinfo_change(mac->dev, changes);
}
void ieee80211softmac_recalc_txrates(struct ieee80211softmac_device *mac)
{
struct ieee80211softmac_txrates *txrates = &mac->txrates;
u32 change = 0;
change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
txrates->default_rate = ieee80211softmac_highest_supported_rate(mac, &mac->bssinfo.supported_rates, 0);
change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
txrates->default_fallback = lower_rate(mac, txrates->default_rate);
change |= IEEE80211SOFTMAC_TXRATECHG_MCAST;
txrates->mcast_rate = ieee80211softmac_highest_supported_rate(mac, &mac->bssinfo.supported_rates, 1);
if (mac->txrates_change)
mac->txrates_change(mac->dev, change);
}
void ieee80211softmac_init_bss(struct ieee80211softmac_device *mac)
{
struct ieee80211_device *ieee = mac->ieee;
u32 change = 0;
struct ieee80211softmac_txrates *txrates = &mac->txrates;
struct ieee80211softmac_bss_info *bssinfo = &mac->bssinfo;
/* TODO: We need some kind of state machine to lower the default rates
* if we loose too many packets.
*/
/* Change the default txrate to the highest possible value.
* The txrate machine will lower it, if it is too high.
*/
if (ieee->modulation & IEEE80211_OFDM_MODULATION)
txrates->user_rate = IEEE80211_OFDM_RATE_24MB;
else
txrates->user_rate = IEEE80211_CCK_RATE_11MB;
txrates->default_rate = IEEE80211_CCK_RATE_1MB;
change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
txrates->default_fallback = IEEE80211_CCK_RATE_1MB;
change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
txrates->mcast_rate = IEEE80211_CCK_RATE_1MB;
change |= IEEE80211SOFTMAC_TXRATECHG_MCAST;
txrates->mgt_mcast_rate = IEEE80211_CCK_RATE_1MB;
change |= IEEE80211SOFTMAC_TXRATECHG_MGT_MCAST;
if (mac->txrates_change)
mac->txrates_change(mac->dev, change);
change = 0;
bssinfo->supported_rates.count = 0;
memset(bssinfo->supported_rates.rates, 0,
sizeof(bssinfo->supported_rates.rates));
change |= IEEE80211SOFTMAC_BSSINFOCHG_RATES;
bssinfo->short_preamble = 0;
change |= IEEE80211SOFTMAC_BSSINFOCHG_SHORT_PREAMBLE;
bssinfo->use_protection = 0;
change |= IEEE80211SOFTMAC_BSSINFOCHG_PROTECTION;
if (mac->bssinfo_change)
mac->bssinfo_change(mac->dev, change);
mac->running = 1;
}
void ieee80211softmac_start(struct net_device *dev)
{
struct ieee80211softmac_device *mac = ieee80211_priv(dev);
ieee80211softmac_start_check_rates(mac);
ieee80211softmac_init_bss(mac);
}
EXPORT_SYMBOL_GPL(ieee80211softmac_start);
void ieee80211softmac_stop(struct net_device *dev)
{
struct ieee80211softmac_device *mac = ieee80211_priv(dev);
ieee80211softmac_clear_pending_work(mac);
}
EXPORT_SYMBOL_GPL(ieee80211softmac_stop);
void ieee80211softmac_set_rates(struct net_device *dev, u8 count, u8 *rates)
{
struct ieee80211softmac_device *mac = ieee80211_priv(dev);
unsigned long flags;
spin_lock_irqsave(&mac->lock, flags);
memcpy(mac->ratesinfo.rates, rates, count);
mac->ratesinfo.count = count;
spin_unlock_irqrestore(&mac->lock, flags);
}
EXPORT_SYMBOL_GPL(ieee80211softmac_set_rates);
static u8 raise_rate(struct ieee80211softmac_device *mac, u8 rate)
{
int i;
struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
for (i=0; i<ri->count-1; i++) {
if (ri->rates[i] == rate)
return ri->rates[i+1];
}
/* I guess we can't go any higher... */
return ri->rates[ri->count];
}
u8 ieee80211softmac_lower_rate_delta(struct ieee80211softmac_device *mac, u8 rate, int delta)
{
int i;
struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
for (i=delta; i<ri->count; i++) {
if (ri->rates[i] == rate)
return ri->rates[i-delta];
}
/* I guess we can't go any lower... */
return ri->rates[0];
}
static void ieee80211softmac_add_txrates_badness(struct ieee80211softmac_device *mac,
int amount)
{
u8 default_rate = mac->txrates.default_rate;
u8 default_fallback = mac->txrates.default_fallback;
u32 changes = 0;
//TODO: This is highly experimental code.
// Maybe the dynamic rate selection does not work
// and it has to be removed again.
printk("badness %d\n", mac->txrate_badness);
mac->txrate_badness += amount;
if (mac->txrate_badness <= -1000) {
/* Very small badness. Try a faster bitrate. */
default_rate = raise_rate(mac, default_rate);
changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
default_fallback = get_fallback_rate(mac, default_rate);
changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
mac->txrate_badness = 0;
printk("Bitrate raised to %u\n", default_rate);
} else if (mac->txrate_badness >= 10000) {
/* Very high badness. Try a slower bitrate. */
default_rate = lower_rate(mac, default_rate);
changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
default_fallback = get_fallback_rate(mac, default_rate);
changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
mac->txrate_badness = 0;
printk("Bitrate lowered to %u\n", default_rate);
}
mac->txrates.default_rate = default_rate;
mac->txrates.default_fallback = default_fallback;
if (changes && mac->txrates_change)
mac->txrates_change(mac->dev, changes);
}
void ieee80211softmac_fragment_lost(struct net_device *dev,
u16 wl_seq)
{
struct ieee80211softmac_device *mac = ieee80211_priv(dev);
unsigned long flags;
spin_lock_irqsave(&mac->lock, flags);
ieee80211softmac_add_txrates_badness(mac, 1000);
//TODO
spin_unlock_irqrestore(&mac->lock, flags);
}
EXPORT_SYMBOL_GPL(ieee80211softmac_fragment_lost);
static int rate_cmp(const void *a_, const void *b_) {
u8 *a, *b;
a = (u8*)a_;
b = (u8*)b_;
return ((*a & ~IEEE80211_BASIC_RATE_MASK) - (*b & ~IEEE80211_BASIC_RATE_MASK));
}
/* Allocate a softmac network struct and fill it from a network */
struct ieee80211softmac_network *
ieee80211softmac_create_network(struct ieee80211softmac_device *mac,
struct ieee80211_network *net)
{
struct ieee80211softmac_network *softnet;
softnet = kzalloc(sizeof(struct ieee80211softmac_network), GFP_ATOMIC);
if(softnet == NULL)
return NULL;
memcpy(softnet->bssid, net->bssid, ETH_ALEN);
softnet->channel = net->channel;
softnet->essid.len = net->ssid_len;
memcpy(softnet->essid.data, net->ssid, softnet->essid.len);
/* copy rates over */
softnet->supported_rates.count = net->rates_len;
memcpy(&softnet->supported_rates.rates[0], net->rates, net->rates_len);
memcpy(&softnet->supported_rates.rates[softnet->supported_rates.count], net->rates_ex, net->rates_ex_len);
softnet->supported_rates.count += net->rates_ex_len;
sort(softnet->supported_rates.rates, softnet->supported_rates.count, sizeof(softnet->supported_rates.rates[0]), rate_cmp, NULL);
/* we save the ERP value because it is needed at association time, and
* many AP's do not include an ERP IE in the association response. */
softnet->erp_value = net->erp_value;
softnet->capabilities = net->capability;
return softnet;
}
/* Add a network to the list, while locked */
void
ieee80211softmac_add_network_locked(struct ieee80211softmac_device *mac,
struct ieee80211softmac_network *add_net)
{
struct list_head *list_ptr;
struct ieee80211softmac_network *softmac_net = NULL;
list_for_each(list_ptr, &mac->network_list) {
softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list);
if(!memcmp(softmac_net->bssid, add_net->bssid, ETH_ALEN))
break;
else
softmac_net = NULL;
}
if(softmac_net == NULL)
list_add(&(add_net->list), &mac->network_list);
}
/* Add a network to the list, with locking */
void
ieee80211softmac_add_network(struct ieee80211softmac_device *mac,
struct ieee80211softmac_network *add_net)
{
unsigned long flags;
spin_lock_irqsave(&mac->lock, flags);
ieee80211softmac_add_network_locked(mac, add_net);
spin_unlock_irqrestore(&mac->lock, flags);
}
/* Delete a network from the list, while locked*/
void
ieee80211softmac_del_network_locked(struct ieee80211softmac_device *mac,
struct ieee80211softmac_network *del_net)
{
list_del(&(del_net->list));
}
/* Delete a network from the list with locking */
void
ieee80211softmac_del_network(struct ieee80211softmac_device *mac,
struct ieee80211softmac_network *del_net)
{
unsigned long flags;
spin_lock_irqsave(&mac->lock, flags);
ieee80211softmac_del_network_locked(mac, del_net);
spin_unlock_irqrestore(&mac->lock, flags);
}
/* Get a network from the list by MAC while locked */
struct ieee80211softmac_network *
ieee80211softmac_get_network_by_bssid_locked(struct ieee80211softmac_device *mac,
u8 *bssid)
{
struct list_head *list_ptr;
struct ieee80211softmac_network *softmac_net = NULL;
list_for_each(list_ptr, &mac->network_list) {
softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list);
if(!memcmp(softmac_net->bssid, bssid, ETH_ALEN))
break;
else
softmac_net = NULL;
}
return softmac_net;
}
/* Get a network from the list by BSSID with locking */
struct ieee80211softmac_network *
ieee80211softmac_get_network_by_bssid(struct ieee80211softmac_device *mac,
u8 *bssid)
{
unsigned long flags;
struct ieee80211softmac_network *softmac_net;
spin_lock_irqsave(&mac->lock, flags);
softmac_net = ieee80211softmac_get_network_by_bssid_locked(mac, bssid);
spin_unlock_irqrestore(&mac->lock, flags);
return softmac_net;
}
/* Get a network from the list by ESSID while locked */
struct ieee80211softmac_network *
ieee80211softmac_get_network_by_essid_locked(struct ieee80211softmac_device *mac,
struct ieee80211softmac_essid *essid)
{
struct list_head *list_ptr;
struct ieee80211softmac_network *softmac_net = NULL;
list_for_each(list_ptr, &mac->network_list) {
softmac_net = list_entry(list_ptr, struct ieee80211softmac_network, list);
if (softmac_net->essid.len == essid->len &&
!memcmp(softmac_net->essid.data, essid->data, essid->len))
return softmac_net;
}
return NULL;
}
/* Get a network from the list by ESSID with locking */
struct ieee80211softmac_network *
ieee80211softmac_get_network_by_essid(struct ieee80211softmac_device *mac,
struct ieee80211softmac_essid *essid)
{
unsigned long flags;
struct ieee80211softmac_network *softmac_net = NULL;
spin_lock_irqsave(&mac->lock, flags);
softmac_net = ieee80211softmac_get_network_by_essid_locked(mac, essid);
spin_unlock_irqrestore(&mac->lock, flags);
return softmac_net;
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Johannes Berg");
MODULE_AUTHOR("Joseph Jezak");
MODULE_AUTHOR("Larry Finger");
MODULE_AUTHOR("Danny van Dyk");
MODULE_AUTHOR("Michael Buesch");
MODULE_DESCRIPTION("802.11 software MAC");
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