569 lines
18 KiB
C
569 lines
18 KiB
C
/*
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* Contains some basic softmac functions along with module registration code etc.
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*
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* Copyright (c) 2005, 2006 Johannes Berg <johannes@sipsolutions.net>
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* Joseph Jezak <josejx@gentoo.org>
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* Larry Finger <Larry.Finger@lwfinger.net>
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* Danny van Dyk <kugelfang@gentoo.org>
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* Michael Buesch <mbuesch@freenet.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* The full GNU General Public License is included in this distribution in the
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* file called COPYING.
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*/
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#include "ieee80211softmac_priv.h"
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#include <linux/sort.h>
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#include <linux/etherdevice.h>
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struct net_device *alloc_ieee80211softmac(int sizeof_priv)
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{
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struct ieee80211softmac_device *softmac;
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struct net_device *dev;
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dev = alloc_ieee80211(sizeof(*softmac) + sizeof_priv);
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if (!dev)
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return NULL;
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softmac = ieee80211_priv(dev);
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softmac->wq = create_freezeable_workqueue("softmac");
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if (!softmac->wq) {
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free_ieee80211(dev);
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return NULL;
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}
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softmac->dev = dev;
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softmac->ieee = netdev_priv(dev);
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spin_lock_init(&softmac->lock);
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softmac->ieee->handle_auth = ieee80211softmac_auth_resp;
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softmac->ieee->handle_deauth = ieee80211softmac_deauth_resp;
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softmac->ieee->handle_assoc_response = ieee80211softmac_handle_assoc_response;
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softmac->ieee->handle_reassoc_request = ieee80211softmac_handle_reassoc_req;
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softmac->ieee->handle_disassoc = ieee80211softmac_handle_disassoc;
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softmac->ieee->handle_beacon = ieee80211softmac_handle_beacon;
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softmac->scaninfo = NULL;
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softmac->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT;
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/* TODO: initialise all the other callbacks in the ieee struct
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* (once they're written)
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*/
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INIT_LIST_HEAD(&softmac->auth_queue);
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INIT_LIST_HEAD(&softmac->network_list);
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INIT_LIST_HEAD(&softmac->events);
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mutex_init(&softmac->associnfo.mutex);
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INIT_DELAYED_WORK(&softmac->associnfo.work, ieee80211softmac_assoc_work);
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INIT_DELAYED_WORK(&softmac->associnfo.timeout, ieee80211softmac_assoc_timeout);
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softmac->start_scan = ieee80211softmac_start_scan_implementation;
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softmac->wait_for_scan = ieee80211softmac_wait_for_scan_implementation;
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softmac->stop_scan = ieee80211softmac_stop_scan_implementation;
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/* to start with, we can't send anything ... */
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netif_carrier_off(dev);
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return dev;
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}
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EXPORT_SYMBOL_GPL(alloc_ieee80211softmac);
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/* Clears the pending work queue items, stops all scans, etc. */
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void
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ieee80211softmac_clear_pending_work(struct ieee80211softmac_device *sm)
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{
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unsigned long flags;
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struct ieee80211softmac_event *eventptr, *eventtmp;
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struct ieee80211softmac_auth_queue_item *authptr, *authtmp;
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struct ieee80211softmac_network *netptr, *nettmp;
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ieee80211softmac_stop_scan(sm);
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ieee80211softmac_wait_for_scan(sm);
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spin_lock_irqsave(&sm->lock, flags);
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sm->running = 0;
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/* Free all pending assoc work items */
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cancel_delayed_work(&sm->associnfo.work);
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/* Free all pending scan work items */
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if(sm->scaninfo != NULL)
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cancel_delayed_work(&sm->scaninfo->softmac_scan);
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/* Free all pending auth work items */
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list_for_each_entry(authptr, &sm->auth_queue, list)
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cancel_delayed_work(&authptr->work);
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/* delete all pending event calls and work items */
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list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list)
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cancel_delayed_work(&eventptr->work);
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spin_unlock_irqrestore(&sm->lock, flags);
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flush_workqueue(sm->wq);
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/* now we should be save and no longer need locking... */
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spin_lock_irqsave(&sm->lock, flags);
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/* Free all pending auth work items */
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list_for_each_entry_safe(authptr, authtmp, &sm->auth_queue, list) {
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list_del(&authptr->list);
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kfree(authptr);
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}
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/* delete all pending event calls and work items */
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list_for_each_entry_safe(eventptr, eventtmp, &sm->events, list) {
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list_del(&eventptr->list);
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kfree(eventptr);
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}
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/* Free all networks */
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list_for_each_entry_safe(netptr, nettmp, &sm->network_list, list) {
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ieee80211softmac_del_network_locked(sm, netptr);
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if(netptr->challenge != NULL)
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kfree(netptr->challenge);
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kfree(netptr);
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}
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spin_unlock_irqrestore(&sm->lock, flags);
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}
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EXPORT_SYMBOL_GPL(ieee80211softmac_clear_pending_work);
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void free_ieee80211softmac(struct net_device *dev)
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{
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struct ieee80211softmac_device *sm = ieee80211_priv(dev);
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ieee80211softmac_clear_pending_work(sm);
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kfree(sm->scaninfo);
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kfree(sm->wpa.IE);
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destroy_workqueue(sm->wq);
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free_ieee80211(dev);
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}
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EXPORT_SYMBOL_GPL(free_ieee80211softmac);
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static void ieee80211softmac_start_check_rates(struct ieee80211softmac_device *mac)
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{
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struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
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/* I took out the sorting check, we're seperating by modulation now. */
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if (ri->count)
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return;
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/* otherwise assume we hav'em all! */
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if (mac->ieee->modulation & IEEE80211_CCK_MODULATION) {
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ri->rates[ri->count++] = IEEE80211_CCK_RATE_1MB;
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ri->rates[ri->count++] = IEEE80211_CCK_RATE_2MB;
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ri->rates[ri->count++] = IEEE80211_CCK_RATE_5MB;
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ri->rates[ri->count++] = IEEE80211_CCK_RATE_11MB;
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}
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if (mac->ieee->modulation & IEEE80211_OFDM_MODULATION) {
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ri->rates[ri->count++] = IEEE80211_OFDM_RATE_6MB;
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ri->rates[ri->count++] = IEEE80211_OFDM_RATE_9MB;
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ri->rates[ri->count++] = IEEE80211_OFDM_RATE_12MB;
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ri->rates[ri->count++] = IEEE80211_OFDM_RATE_18MB;
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ri->rates[ri->count++] = IEEE80211_OFDM_RATE_24MB;
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ri->rates[ri->count++] = IEEE80211_OFDM_RATE_36MB;
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ri->rates[ri->count++] = IEEE80211_OFDM_RATE_48MB;
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ri->rates[ri->count++] = IEEE80211_OFDM_RATE_54MB;
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}
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}
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int ieee80211softmac_ratesinfo_rate_supported(struct ieee80211softmac_ratesinfo *ri, u8 rate)
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{
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int search;
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u8 search_rate;
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for (search = 0; search < ri->count; search++) {
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search_rate = ri->rates[search];
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search_rate &= ~IEEE80211_BASIC_RATE_MASK;
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if (rate == search_rate)
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return 1;
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}
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return 0;
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}
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u8 ieee80211softmac_highest_supported_rate(struct ieee80211softmac_device *mac,
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struct ieee80211softmac_ratesinfo *ri, int basic_only)
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{
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u8 user_rate = mac->txrates.user_rate;
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int i;
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if (ri->count == 0)
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return IEEE80211_CCK_RATE_1MB;
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for (i = ri->count - 1; i >= 0; i--) {
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u8 rate = ri->rates[i];
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if (basic_only && !(rate & IEEE80211_BASIC_RATE_MASK))
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continue;
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rate &= ~IEEE80211_BASIC_RATE_MASK;
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if (rate > user_rate)
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continue;
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if (ieee80211softmac_ratesinfo_rate_supported(&mac->ratesinfo, rate))
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return rate;
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}
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/* If we haven't found a suitable rate by now, just trust the user */
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return user_rate;
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}
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EXPORT_SYMBOL_GPL(ieee80211softmac_highest_supported_rate);
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void ieee80211softmac_process_erp(struct ieee80211softmac_device *mac,
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u8 erp_value)
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{
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int use_protection;
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int short_preamble;
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u32 changes = 0;
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/* Barker preamble mode */
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short_preamble = ((erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0
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&& mac->associnfo.short_preamble_available) ? 1 : 0;
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/* Protection needed? */
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use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
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if (mac->bssinfo.short_preamble != short_preamble) {
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changes |= IEEE80211SOFTMAC_BSSINFOCHG_SHORT_PREAMBLE;
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mac->bssinfo.short_preamble = short_preamble;
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}
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if (mac->bssinfo.use_protection != use_protection) {
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changes |= IEEE80211SOFTMAC_BSSINFOCHG_PROTECTION;
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mac->bssinfo.use_protection = use_protection;
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}
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if (mac->bssinfo_change && changes)
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mac->bssinfo_change(mac->dev, changes);
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}
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void ieee80211softmac_recalc_txrates(struct ieee80211softmac_device *mac)
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{
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struct ieee80211softmac_txrates *txrates = &mac->txrates;
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u32 change = 0;
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change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
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txrates->default_rate = ieee80211softmac_highest_supported_rate(mac, &mac->bssinfo.supported_rates, 0);
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change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
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txrates->default_fallback = lower_rate(mac, txrates->default_rate);
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change |= IEEE80211SOFTMAC_TXRATECHG_MCAST;
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txrates->mcast_rate = ieee80211softmac_highest_supported_rate(mac, &mac->bssinfo.supported_rates, 1);
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if (mac->txrates_change)
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mac->txrates_change(mac->dev, change);
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}
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void ieee80211softmac_init_bss(struct ieee80211softmac_device *mac)
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{
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struct ieee80211_device *ieee = mac->ieee;
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u32 change = 0;
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struct ieee80211softmac_txrates *txrates = &mac->txrates;
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struct ieee80211softmac_bss_info *bssinfo = &mac->bssinfo;
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/* TODO: We need some kind of state machine to lower the default rates
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* if we loose too many packets.
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*/
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/* Change the default txrate to the highest possible value.
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* The txrate machine will lower it, if it is too high.
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*/
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if (ieee->modulation & IEEE80211_OFDM_MODULATION)
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txrates->user_rate = IEEE80211_OFDM_RATE_24MB;
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else
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txrates->user_rate = IEEE80211_CCK_RATE_11MB;
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txrates->default_rate = IEEE80211_CCK_RATE_1MB;
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change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
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txrates->default_fallback = IEEE80211_CCK_RATE_1MB;
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change |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
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txrates->mcast_rate = IEEE80211_CCK_RATE_1MB;
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change |= IEEE80211SOFTMAC_TXRATECHG_MCAST;
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txrates->mgt_mcast_rate = IEEE80211_CCK_RATE_1MB;
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change |= IEEE80211SOFTMAC_TXRATECHG_MGT_MCAST;
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if (mac->txrates_change)
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mac->txrates_change(mac->dev, change);
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change = 0;
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bssinfo->supported_rates.count = 0;
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memset(bssinfo->supported_rates.rates, 0,
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sizeof(bssinfo->supported_rates.rates));
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change |= IEEE80211SOFTMAC_BSSINFOCHG_RATES;
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bssinfo->short_preamble = 0;
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change |= IEEE80211SOFTMAC_BSSINFOCHG_SHORT_PREAMBLE;
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bssinfo->use_protection = 0;
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change |= IEEE80211SOFTMAC_BSSINFOCHG_PROTECTION;
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if (mac->bssinfo_change)
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mac->bssinfo_change(mac->dev, change);
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mac->running = 1;
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}
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void ieee80211softmac_start(struct net_device *dev)
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{
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struct ieee80211softmac_device *mac = ieee80211_priv(dev);
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ieee80211softmac_start_check_rates(mac);
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ieee80211softmac_init_bss(mac);
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}
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EXPORT_SYMBOL_GPL(ieee80211softmac_start);
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void ieee80211softmac_stop(struct net_device *dev)
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{
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struct ieee80211softmac_device *mac = ieee80211_priv(dev);
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ieee80211softmac_clear_pending_work(mac);
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}
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EXPORT_SYMBOL_GPL(ieee80211softmac_stop);
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void ieee80211softmac_set_rates(struct net_device *dev, u8 count, u8 *rates)
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{
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struct ieee80211softmac_device *mac = ieee80211_priv(dev);
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unsigned long flags;
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spin_lock_irqsave(&mac->lock, flags);
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memcpy(mac->ratesinfo.rates, rates, count);
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mac->ratesinfo.count = count;
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spin_unlock_irqrestore(&mac->lock, flags);
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}
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EXPORT_SYMBOL_GPL(ieee80211softmac_set_rates);
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static u8 raise_rate(struct ieee80211softmac_device *mac, u8 rate)
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{
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int i;
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struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
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for (i=0; i<ri->count-1; i++) {
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if (ri->rates[i] == rate)
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return ri->rates[i+1];
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}
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/* I guess we can't go any higher... */
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return ri->rates[ri->count];
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}
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u8 ieee80211softmac_lower_rate_delta(struct ieee80211softmac_device *mac, u8 rate, int delta)
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{
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int i;
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struct ieee80211softmac_ratesinfo *ri = &mac->ratesinfo;
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for (i=delta; i<ri->count; i++) {
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if (ri->rates[i] == rate)
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return ri->rates[i-delta];
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}
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/* I guess we can't go any lower... */
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return ri->rates[0];
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}
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static void ieee80211softmac_add_txrates_badness(struct ieee80211softmac_device *mac,
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int amount)
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{
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u8 default_rate = mac->txrates.default_rate;
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u8 default_fallback = mac->txrates.default_fallback;
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u32 changes = 0;
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//TODO: This is highly experimental code.
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// Maybe the dynamic rate selection does not work
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// and it has to be removed again.
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printk("badness %d\n", mac->txrate_badness);
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mac->txrate_badness += amount;
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if (mac->txrate_badness <= -1000) {
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/* Very small badness. Try a faster bitrate. */
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default_rate = raise_rate(mac, default_rate);
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changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
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default_fallback = get_fallback_rate(mac, default_rate);
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changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
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mac->txrate_badness = 0;
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printk("Bitrate raised to %u\n", default_rate);
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} else if (mac->txrate_badness >= 10000) {
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/* Very high badness. Try a slower bitrate. */
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default_rate = lower_rate(mac, default_rate);
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changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT;
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default_fallback = get_fallback_rate(mac, default_rate);
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changes |= IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK;
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mac->txrate_badness = 0;
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printk("Bitrate lowered to %u\n", default_rate);
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}
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mac->txrates.default_rate = default_rate;
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mac->txrates.default_fallback = default_fallback;
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if (changes && mac->txrates_change)
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mac->txrates_change(mac->dev, changes);
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}
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void ieee80211softmac_fragment_lost(struct net_device *dev,
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u16 wl_seq)
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{
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struct ieee80211softmac_device *mac = ieee80211_priv(dev);
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unsigned long flags;
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spin_lock_irqsave(&mac->lock, flags);
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ieee80211softmac_add_txrates_badness(mac, 1000);
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//TODO
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spin_unlock_irqrestore(&mac->lock, flags);
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}
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EXPORT_SYMBOL_GPL(ieee80211softmac_fragment_lost);
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static int rate_cmp(const void *a_, const void *b_) {
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u8 *a, *b;
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a = (u8*)a_;
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b = (u8*)b_;
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return ((*a & ~IEEE80211_BASIC_RATE_MASK) - (*b & ~IEEE80211_BASIC_RATE_MASK));
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}
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/* Allocate a softmac network struct and fill it from a network */
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struct ieee80211softmac_network *
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ieee80211softmac_create_network(struct ieee80211softmac_device *mac,
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struct ieee80211_network *net)
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{
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struct ieee80211softmac_network *softnet;
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softnet = kzalloc(sizeof(struct ieee80211softmac_network), GFP_ATOMIC);
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if(softnet == NULL)
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return NULL;
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memcpy(softnet->bssid, net->bssid, ETH_ALEN);
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softnet->channel = net->channel;
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softnet->essid.len = net->ssid_len;
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memcpy(softnet->essid.data, net->ssid, softnet->essid.len);
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/* copy rates over */
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softnet->supported_rates.count = net->rates_len;
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memcpy(&softnet->supported_rates.rates[0], net->rates, net->rates_len);
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memcpy(&softnet->supported_rates.rates[softnet->supported_rates.count], net->rates_ex, net->rates_ex_len);
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softnet->supported_rates.count += net->rates_ex_len;
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sort(softnet->supported_rates.rates, softnet->supported_rates.count, sizeof(softnet->supported_rates.rates[0]), rate_cmp, NULL);
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/* we save the ERP value because it is needed at association time, and
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* many AP's do not include an ERP IE in the association response. */
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softnet->erp_value = net->erp_value;
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softnet->capabilities = net->capability;
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return softnet;
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}
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/* Add a network to the list, while locked */
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void
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ieee80211softmac_add_network_locked(struct ieee80211softmac_device *mac,
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struct ieee80211softmac_network *add_net)
|
|
{
|
|
struct ieee80211softmac_network *softmac_net;
|
|
|
|
list_for_each_entry(softmac_net, &mac->network_list, list) {
|
|
if(!memcmp(softmac_net->bssid, add_net->bssid, ETH_ALEN))
|
|
return;
|
|
}
|
|
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 ieee80211softmac_network *softmac_net;
|
|
|
|
list_for_each_entry(softmac_net, &mac->network_list, list) {
|
|
if(!memcmp(softmac_net->bssid, bssid, ETH_ALEN))
|
|
return softmac_net;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* 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 ieee80211softmac_network *softmac_net;
|
|
|
|
list_for_each_entry(softmac_net, &mac->network_list, 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");
|