diff options
Diffstat (limited to 'net/ieee80211/softmac/ieee80211softmac_module.c')
| -rw-r--r-- | net/ieee80211/softmac/ieee80211softmac_module.c | 621 |
1 files changed, 621 insertions, 0 deletions
diff --git a/net/ieee80211/softmac/ieee80211softmac_module.c b/net/ieee80211/softmac/ieee80211softmac_module.c new file mode 100644 index 000000000000..fcf6a28295e8 --- /dev/null +++ b/net/ieee80211/softmac/ieee80211softmac_module.c @@ -0,0 +1,621 @@ +/* + * 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); + if (!dev) + return NULL; + + softmac = ieee80211_priv(dev); +// softmac->wq = create_freezeable_workqueue("softmac"); + softmac->wq = create_workqueue("softmac"); + if (!softmac->wq) { + free_ieee80211(dev); + return NULL; + } + + 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->ieee->handle_probe_response = ieee80211softmac_handle_probe_resp; + softmac->scaninfo = NULL; + + softmac->associnfo.scan_retry = IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT; + softmac->associnfo.channel = -1; + /* 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 | IEEE80211_BASIC_RATE_MASK; + ri->rates[ri->count++] = IEEE80211_CCK_RATE_2MB | IEEE80211_BASIC_RATE_MASK; + ri->rates[ri->count++] = IEEE80211_CCK_RATE_5MB | IEEE80211_BASIC_RATE_MASK; + ri->rates[ri->count++] = IEEE80211_CCK_RATE_11MB | IEEE80211_BASIC_RATE_MASK; + } + 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->mode = (net->capability & WLAN_CAPABILITY_ESS)? IW_MODE_INFRA: IW_MODE_ADHOC; + 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; +} +EXPORT_SYMBOL_GPL(ieee80211softmac_get_network_by_bssid_locked); + +/* 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 MAC and channel while locked */ +struct ieee80211softmac_network * +ieee80211softmac_get_network_by_bssid_with_channel_locked( + struct ieee80211softmac_device *mac, + u8 *bssid, + u8 channel ) +{ + 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) && + (channel == softmac_net->channel)) + break; + else + softmac_net = NULL; + } + return softmac_net; +} + +/* Get a network from the list by BSSID and channel with locking */ +struct ieee80211softmac_network * +ieee80211softmac_get_network_by_bssid_with_channel( + struct ieee80211softmac_device *mac, + u8 *bssid, + u8 channel ) +{ + unsigned long flags; + struct ieee80211softmac_network *softmac_net; + + spin_lock_irqsave(&mac->lock, flags); + softmac_net = ieee80211softmac_get_network_by_bssid_with_channel_locked(mac, bssid,channel); + 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; +} +EXPORT_SYMBOL_GPL(ieee80211softmac_get_network_by_essid_locked); + +/* 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"); |