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372 lines
12 KiB
C
372 lines
12 KiB
C
/*
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* ieee80211softmac.h - public interface to the softmac
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*
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* Copyright (c) 2005 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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#ifndef IEEE80211SOFTMAC_H_
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#define IEEE80211SOFTMAC_H_
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/list.h>
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#include <net/ieee80211.h>
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/* Once the API is considered more or less stable,
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* this should be incremented on API incompatible changes.
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*/
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#define IEEE80211SOFTMAC_API 0
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#define IEEE80211SOFTMAC_MAX_RATES_LEN 8
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#define IEEE80211SOFTMAC_MAX_EX_RATES_LEN 255
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struct ieee80211softmac_ratesinfo {
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u8 count;
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u8 rates[IEEE80211SOFTMAC_MAX_RATES_LEN + IEEE80211SOFTMAC_MAX_EX_RATES_LEN];
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};
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/* internal structures */
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struct ieee80211softmac_network;
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struct ieee80211softmac_scaninfo;
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struct ieee80211softmac_essid {
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u8 len;
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char data[IW_ESSID_MAX_SIZE+1];
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};
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struct ieee80211softmac_wpa {
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char *IE;
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int IElen;
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int IEbuflen;
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};
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/*
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* Information about association
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*/
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struct ieee80211softmac_assoc_info {
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struct mutex mutex;
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/*
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* This is the requested ESSID. It is written
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* only by the WX handlers.
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*
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*/
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struct ieee80211softmac_essid req_essid;
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/*
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* the ESSID of the network we're currently
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* associated (or trying) to. This is
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* updated to the network's actual ESSID
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* even if the requested ESSID was 'ANY'
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*/
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struct ieee80211softmac_essid associate_essid;
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/* BSSID we're trying to associate to */
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char bssid[ETH_ALEN];
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/* some flags.
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* static_essid is valid if the essid is constant,
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* this is for use by the wx handlers only.
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*
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* associating is true, if the network has been
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* auth'ed on and we are in the process of associating.
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*
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* bssvalid is true if we found a matching network
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* and saved it's BSSID into the bssid above.
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*
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* bssfixed is used for SIOCSIWAP.
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*/
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u8 static_essid;
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u8 short_preamble_available;
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u8 associating;
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u8 associated;
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u8 assoc_wait;
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u8 bssvalid;
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u8 bssfixed;
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/* Scan retries remaining */
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int scan_retry;
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struct delayed_work work;
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struct delayed_work timeout;
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};
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struct ieee80211softmac_bss_info {
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/* Rates supported by the network */
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struct ieee80211softmac_ratesinfo supported_rates;
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/* This indicates whether frames can currently be transmitted with
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* short preamble (only use this variable during TX at CCK rates) */
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u8 short_preamble:1;
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/* This indicates whether protection (e.g. self-CTS) should be used
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* when transmitting with OFDM modulation */
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u8 use_protection:1;
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};
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enum {
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IEEE80211SOFTMAC_AUTH_OPEN_REQUEST = 1,
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IEEE80211SOFTMAC_AUTH_OPEN_RESPONSE = 2,
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};
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enum {
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IEEE80211SOFTMAC_AUTH_SHARED_REQUEST = 1,
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IEEE80211SOFTMAC_AUTH_SHARED_CHALLENGE = 2,
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IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE = 3,
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IEEE80211SOFTMAC_AUTH_SHARED_PASS = 4,
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};
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/* We should make these tunable
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* AUTH_TIMEOUT seems really long, but that's what it is in BSD */
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#define IEEE80211SOFTMAC_AUTH_TIMEOUT (12 * HZ)
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#define IEEE80211SOFTMAC_AUTH_RETRY_LIMIT 5
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#define IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT 3
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struct ieee80211softmac_txrates {
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/* The Bit-Rate to be used for multicast frames. */
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u8 mcast_rate;
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/* The Bit-Rate to be used for multicast management frames. */
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u8 mgt_mcast_rate;
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/* The Bit-Rate to be used for any other (normal) data packet. */
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u8 default_rate;
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/* The Bit-Rate to be used for default fallback
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* (If the device supports fallback and hardware-retry)
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*/
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u8 default_fallback;
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/* This is the rate that the user asked for */
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u8 user_rate;
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};
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/* Bits for txrates_change callback. */
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#define IEEE80211SOFTMAC_TXRATECHG_DEFAULT (1 << 0) /* default_rate */
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#define IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK (1 << 1) /* default_fallback */
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#define IEEE80211SOFTMAC_TXRATECHG_MCAST (1 << 2) /* mcast_rate */
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#define IEEE80211SOFTMAC_TXRATECHG_MGT_MCAST (1 << 3) /* mgt_mcast_rate */
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#define IEEE80211SOFTMAC_BSSINFOCHG_RATES (1 << 0) /* supported_rates */
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#define IEEE80211SOFTMAC_BSSINFOCHG_SHORT_PREAMBLE (1 << 1) /* short_preamble */
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#define IEEE80211SOFTMAC_BSSINFOCHG_PROTECTION (1 << 2) /* use_protection */
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struct ieee80211softmac_device {
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/* 802.11 structure for data stuff */
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struct ieee80211_device *ieee;
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struct net_device *dev;
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/* only valid if associated, then holds the Association ID */
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u16 association_id;
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/* the following methods are callbacks that the driver
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* using this framework has to assign
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*/
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/* always assign these */
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void (*set_bssid_filter)(struct net_device *dev, const u8 *bssid);
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void (*set_channel)(struct net_device *dev, u8 channel);
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/* assign if you need it, informational only */
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void (*link_change)(struct net_device *dev);
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/* If the hardware can do scanning, assign _all_ three of these callbacks.
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* When the scan finishes, call ieee80211softmac_scan_finished().
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*/
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/* when called, start_scan is guaranteed to not be called again
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* until you call ieee80211softmac_scan_finished.
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* Return 0 if scanning could start, error otherwise.
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* SOFTMAC AUTHORS: don't call this, use ieee80211softmac_start_scan */
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int (*start_scan)(struct net_device *dev);
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/* this should block until after ieee80211softmac_scan_finished was called
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* SOFTMAC AUTHORS: don't call this, use ieee80211softmac_wait_for_scan */
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void (*wait_for_scan)(struct net_device *dev);
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/* stop_scan aborts a scan, but is asynchronous.
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* if you want to wait for it too, use wait_for_scan
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* SOFTMAC AUTHORS: don't call this, use ieee80211softmac_stop_scan */
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void (*stop_scan)(struct net_device *dev);
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/* we'll need something about beacons here too, for AP or ad-hoc modes */
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/* Transmission rates to be used by the driver.
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* The SoftMAC figures out the best possible rates.
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* The driver just needs to read them.
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*/
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struct ieee80211softmac_txrates txrates;
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/* If the driver needs to do stuff on TX rate changes, assign this
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* callback. See IEEE80211SOFTMAC_TXRATECHG for change flags. */
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void (*txrates_change)(struct net_device *dev,
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u32 changes);
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/* If the driver needs to do stuff when BSS properties change, assign
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* this callback. see IEEE80211SOFTMAC_BSSINFOCHG for change flags. */
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void (*bssinfo_change)(struct net_device *dev,
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u32 changes);
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/* private stuff follows */
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/* this lock protects this structure */
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spinlock_t lock;
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u8 running; /* SoftMAC started? */
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u8 scanning;
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struct ieee80211softmac_scaninfo *scaninfo;
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struct ieee80211softmac_assoc_info associnfo;
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struct ieee80211softmac_bss_info bssinfo;
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struct list_head auth_queue;
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struct list_head events;
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struct ieee80211softmac_ratesinfo ratesinfo;
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int txrate_badness;
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/* WPA stuff */
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struct ieee80211softmac_wpa wpa;
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/* we need to keep a list of network structs we copied */
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struct list_head network_list;
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/* This must be the last item so that it points to the data
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* allocated beyond this structure by alloc_ieee80211 */
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u8 priv[0];
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};
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extern void ieee80211softmac_scan_finished(struct ieee80211softmac_device *sm);
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static inline void * ieee80211softmac_priv(struct net_device *dev)
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{
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return ((struct ieee80211softmac_device *)ieee80211_priv(dev))->priv;
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}
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extern struct net_device * alloc_ieee80211softmac(int sizeof_priv);
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extern void free_ieee80211softmac(struct net_device *dev);
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/* Call this function if you detect a lost TX fragment.
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* (If the device indicates failure of ACK RX, for example.)
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* It is wise to call this function if you are able to detect lost packets,
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* because it contributes to the TX Rates auto adjustment.
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*/
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extern void ieee80211softmac_fragment_lost(struct net_device *dev,
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u16 wireless_sequence_number);
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/* Call this function before _start to tell the softmac what rates
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* the hw supports. The rates parameter is copied, so you can
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* free it right after calling this function.
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* Note that the rates need to be sorted. */
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extern void ieee80211softmac_set_rates(struct net_device *dev, u8 count, u8 *rates);
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/* Finds the highest rate which is:
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* 1. Present in ri (optionally a basic rate)
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* 2. Supported by the device
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* 3. Less than or equal to the user-defined rate
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*/
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extern u8 ieee80211softmac_highest_supported_rate(struct ieee80211softmac_device *mac,
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struct ieee80211softmac_ratesinfo *ri, int basic_only);
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/* Helper function which advises you the rate at which a frame should be
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* transmitted at. */
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static inline u8 ieee80211softmac_suggest_txrate(struct ieee80211softmac_device *mac,
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int is_multicast,
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int is_mgt)
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{
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struct ieee80211softmac_txrates *txrates = &mac->txrates;
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if (!mac->associnfo.associated)
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return txrates->mgt_mcast_rate;
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/* We are associated, sending unicast frame */
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if (!is_multicast)
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return txrates->default_rate;
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/* We are associated, sending multicast frame */
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if (is_mgt)
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return txrates->mgt_mcast_rate;
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else
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return txrates->mcast_rate;
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}
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/* Helper function which advises you when it is safe to transmit with short
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* preamble.
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* You should only call this function when transmitting at CCK rates. */
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static inline int ieee80211softmac_short_preamble_ok(struct ieee80211softmac_device *mac,
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int is_multicast,
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int is_mgt)
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{
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return (is_multicast && is_mgt) ? 0 : mac->bssinfo.short_preamble;
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}
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/* Helper function which advises you whether protection (e.g. self-CTS) is
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* needed. 1 = protection needed, 0 = no protection needed
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* Only use this function when transmitting with OFDM modulation. */
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static inline int ieee80211softmac_protection_needed(struct ieee80211softmac_device *mac)
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{
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return mac->bssinfo.use_protection;
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}
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/* Start the SoftMAC. Call this after you initialized the device
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* and it is ready to run.
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*/
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extern void ieee80211softmac_start(struct net_device *dev);
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/* Stop the SoftMAC. Call this before you shutdown the device. */
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extern void ieee80211softmac_stop(struct net_device *dev);
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/*
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* Event system
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*/
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/* valid event types */
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#define IEEE80211SOFTMAC_EVENT_ANY -1 /*private use only*/
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#define IEEE80211SOFTMAC_EVENT_SCAN_FINISHED 0
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#define IEEE80211SOFTMAC_EVENT_ASSOCIATED 1
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#define IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED 2
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#define IEEE80211SOFTMAC_EVENT_ASSOCIATE_TIMEOUT 3
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#define IEEE80211SOFTMAC_EVENT_AUTHENTICATED 4
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#define IEEE80211SOFTMAC_EVENT_AUTH_FAILED 5
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#define IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT 6
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#define IEEE80211SOFTMAC_EVENT_ASSOCIATE_NET_NOT_FOUND 7
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#define IEEE80211SOFTMAC_EVENT_DISASSOCIATED 8
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/* keep this updated! */
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#define IEEE80211SOFTMAC_EVENT_LAST 8
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/*
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* If you want to be notified of certain events, you can call
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* ieee80211softmac_notify[_atomic] with
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* - event set to one of the constants below
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* - fun set to a function pointer of the appropriate type
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* - context set to the context data you want passed
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* The return value is 0, or an error.
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*/
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typedef void (*notify_function_ptr)(struct net_device *dev, int event_type, void *context);
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#define ieee80211softmac_notify(dev, event, fun, context) ieee80211softmac_notify_gfp(dev, event, fun, context, GFP_KERNEL);
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#define ieee80211softmac_notify_atomic(dev, event, fun, context) ieee80211softmac_notify_gfp(dev, event, fun, context, GFP_ATOMIC);
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extern int ieee80211softmac_notify_gfp(struct net_device *dev,
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int event, notify_function_ptr fun, void *context, gfp_t gfp_mask);
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/* To clear pending work (for ifconfig down, etc.) */
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extern void
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ieee80211softmac_clear_pending_work(struct ieee80211softmac_device *sm);
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#endif /* IEEE80211SOFTMAC_H_ */
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