include/net/ieee80211softmac.h

   1 /*
   2  * ieee80211softmac.h - public interface to the softmac
   3  *
   4  * Copyright (c) 2005 Johannes Berg <johannes@sipsolutions.net>
   5  *                    Joseph Jezak <josejx@gentoo.org>
   6  *                    Larry Finger <Larry.Finger@lwfinger.net>
   7  *                    Danny van Dyk <kugelfang@gentoo.org>
   8  *                    Michael Buesch <mbuesch@freenet.de>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  22  *
  23  * The full GNU General Public License is included in this distribution in the
  24  * file called COPYING.
  25  */
  26
  27 #ifndef IEEE80211SOFTMAC_H_
  28 #define IEEE80211SOFTMAC_H_
  29
  30 #include <linux/kernel.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/workqueue.h>
  33 #include <linux/list.h>
  34 #include <net/ieee80211.h>
  35
  36 /* Once the API is considered more or less stable,
  37  * this should be incremented on API incompatible changes.
  38  */
  39 #define IEEE80211SOFTMAC_API    0
  40
  41 #define IEEE80211SOFTMAC_MAX_RATES_LEN          8
  42 #define IEEE80211SOFTMAC_MAX_EX_RATES_LEN       255
  43
  44 struct ieee80211softmac_ratesinfo {
  45         u8 count;
  46         u8 rates[IEEE80211SOFTMAC_MAX_RATES_LEN + IEEE80211SOFTMAC_MAX_EX_RATES_LEN];
  47 };
  48
  49 /* internal structures */
  50 struct ieee80211softmac_network;
  51 struct ieee80211softmac_scaninfo;
  52
  53 struct ieee80211softmac_essid {
  54         u8 len;
  55         char data[IW_ESSID_MAX_SIZE+1];
  56 };
  57
  58 struct ieee80211softmac_wpa {
  59         char *IE;
  60         int IElen;
  61         int IEbuflen;
  62 };
  63
  64 /*
  65  * Information about association
  66  *
  67  * Do we need a lock for this?
  68  * We only ever use this structure inlined
  69  * into our global struct. I've used its lock,
  70  * but maybe we need a local one here?
  71  */
  72 struct ieee80211softmac_assoc_info {
  73         /*
  74          * This is the requested ESSID. It is written
  75          * only by the WX handlers.
  76          *
  77          */
  78         struct ieee80211softmac_essid req_essid;
  79         /*
  80          * the ESSID of the network we're currently
  81          * associated (or trying) to. This is
  82          * updated to the network's actual ESSID
  83          * even if the requested ESSID was 'ANY'
  84          */
  85         struct ieee80211softmac_essid associate_essid;
  86
  87         /* BSSID we're trying to associate to */
  88         char bssid[ETH_ALEN];
  89
  90         /* some flags.
  91          * static_essid is valid if the essid is constant,
  92          * this is for use by the wx handlers only.
  93          *
  94          * associating is true, if the network has been
  95          * auth'ed on and we are in the process of associating.
  96          *
  97          * bssvalid is true if we found a matching network
  98          * and saved it's BSSID into the bssid above.
  99          */
 100         u8 static_essid:1,
 101            associating:1,
 102            bssvalid:1;
 103
 104         /* Scan retries remaining */
 105         int scan_retry;
 106
 107         struct work_struct work;
 108         struct work_struct timeout;
 109 };
 110
 111 enum {
 112         IEEE80211SOFTMAC_AUTH_OPEN_REQUEST      = 1,
 113         IEEE80211SOFTMAC_AUTH_OPEN_RESPONSE     = 2,
 114 };
 115
 116 enum {
 117         IEEE80211SOFTMAC_AUTH_SHARED_REQUEST    = 1,
 118         IEEE80211SOFTMAC_AUTH_SHARED_CHALLENGE = 2,
 119         IEEE80211SOFTMAC_AUTH_SHARED_RESPONSE   = 3,
 120         IEEE80211SOFTMAC_AUTH_SHARED_PASS       = 4,
 121 };
 122
 123 /* We should make these tunable
 124  * AUTH_TIMEOUT seems really long, but that's what it is in BSD */
 125 #define IEEE80211SOFTMAC_AUTH_TIMEOUT           (12 * HZ)
 126 #define IEEE80211SOFTMAC_AUTH_RETRY_LIMIT       5
 127 #define IEEE80211SOFTMAC_ASSOC_SCAN_RETRY_LIMIT 3
 128
 129 struct ieee80211softmac_txrates {
 130         /* The Bit-Rate to be used for multicast frames. */
 131         u8 mcast_rate;
 132         /* The Bit-Rate to be used for multicast fallback
 133          * (If the device supports fallback and hardware-retry)
 134          */
 135         u8 mcast_fallback;
 136         /* The Bit-Rate to be used for any other (normal) data packet. */
 137         u8 default_rate;
 138         /* The Bit-Rate to be used for default fallback
 139          * (If the device supports fallback and hardware-retry)
 140          */
 141         u8 default_fallback;
 142 };
 143
 144 /* Bits for txrates_change callback. */
 145 #define IEEE80211SOFTMAC_TXRATECHG_DEFAULT              (1 << 0) /* default_rate */
 146 #define IEEE80211SOFTMAC_TXRATECHG_DEFAULT_FBACK        (1 << 1) /* default_fallback */
 147 #define IEEE80211SOFTMAC_TXRATECHG_MCAST                (1 << 2) /* mcast_rate */
 148 #define IEEE80211SOFTMAC_TXRATECHG_MCAST_FBACK          (1 << 3) /* mcast_fallback */
 149
 150 struct ieee80211softmac_device {
 151         /* 802.11 structure for data stuff */
 152         struct ieee80211_device *ieee;
 153         struct net_device *dev;
 154
 155         /* only valid if associated, then holds the Association ID */
 156         u16 association_id;
 157
 158         /* the following methods are callbacks that the driver
 159          * using this framework has to assign
 160          */
 161
 162         /* always assign these */
 163         void (*set_bssid_filter)(struct net_device *dev, const u8 *bssid);
 164         void (*set_channel)(struct net_device *dev, u8 channel);
 165
 166         /* assign if you need it, informational only */
 167         void (*link_change)(struct net_device *dev);
 168
 169         /* If the hardware can do scanning, assign _all_ three of these callbacks.
 170          * When the scan finishes, call ieee80211softmac_scan_finished().
 171          */
 172
 173         /* when called, start_scan is guaranteed to not be called again
 174          * until you call ieee80211softmac_scan_finished.
 175          * Return 0 if scanning could start, error otherwise.
 176          * SOFTMAC AUTHORS: don't call this, use ieee80211softmac_start_scan */
 177         int (*start_scan)(struct net_device *dev);
 178         /* this should block until after ieee80211softmac_scan_finished was called
 179          * SOFTMAC AUTHORS: don't call this, use ieee80211softmac_wait_for_scan */
 180         void (*wait_for_scan)(struct net_device *dev);
 181         /* stop_scan aborts a scan, but is asynchronous.
 182          * if you want to wait for it too, use wait_for_scan
 183          * SOFTMAC AUTHORS: don't call this, use ieee80211softmac_stop_scan */
 184         void (*stop_scan)(struct net_device *dev);
 185
 186         /* we'll need something about beacons here too, for AP or ad-hoc modes */
 187
 188         /* Transmission rates to be used by the driver.
 189          * The SoftMAC figures out the best possible rates.
 190          * The driver just needs to read them.
 191          */
 192         struct ieee80211softmac_txrates txrates;
 193         /* If the driver needs to do stuff on TX rate changes, assign this callback. */
 194         void (*txrates_change)(struct net_device *dev,
 195                                u32 changes, /* see IEEE80211SOFTMAC_TXRATECHG flags */
 196                                const struct ieee80211softmac_txrates *rates_before_change);
 197
 198         /* private stuff follows */
 199         /* this lock protects this structure */
 200         spinlock_t lock;
 201
 202         /* couple of flags */
 203         u8 scanning:1, /* protects scanning from being done multiple times at once */
 204            associated:1;
 205
 206         struct ieee80211softmac_scaninfo *scaninfo;
 207         struct ieee80211softmac_assoc_info associnfo;
 208
 209         struct list_head auth_queue;
 210         struct list_head events;
 211
 212         struct ieee80211softmac_ratesinfo ratesinfo;
 213         int txrate_badness;
 214
 215         /* WPA stuff */
 216         struct ieee80211softmac_wpa wpa;
 217
 218         /* we need to keep a list of network structs we copied */
 219         struct list_head network_list;
 220
 221         /* This must be the last item so that it points to the data
 222          * allocated beyond this structure by alloc_ieee80211 */
 223         u8 priv[0];
 224 };
 225
 226 extern void ieee80211softmac_scan_finished(struct ieee80211softmac_device *sm);
 227
 228 static inline void * ieee80211softmac_priv(struct net_device *dev)
 229 {
 230         return ((struct ieee80211softmac_device *)ieee80211_priv(dev))->priv;
 231 }
 232
 233 extern struct net_device * alloc_ieee80211softmac(int sizeof_priv);
 234 extern void free_ieee80211softmac(struct net_device *dev);
 235
 236 /* Call this function if you detect a lost TX fragment.
 237  * (If the device indicates failure of ACK RX, for example.)
 238  * It is wise to call this function if you are able to detect lost packets,
 239  * because it contributes to the TX Rates auto adjustment.
 240  */
 241 extern void ieee80211softmac_fragment_lost(struct net_device *dev,
 242                                            u16 wireless_sequence_number);
 243 /* Call this function before _start to tell the softmac what rates
 244  * the hw supports. The rates parameter is copied, so you can
 245  * free it right after calling this function.
 246  * Note that the rates need to be sorted. */
 247 extern void ieee80211softmac_set_rates(struct net_device *dev, u8 count, u8 *rates);
 248
 249 /* Start the SoftMAC. Call this after you initialized the device
 250  * and it is ready to run.
 251  */
 252 extern void ieee80211softmac_start(struct net_device *dev);
 253 /* Stop the SoftMAC. Call this before you shutdown the device. */
 254 extern void ieee80211softmac_stop(struct net_device *dev);
 255
 256 /*
 257  * Event system
 258  */
 259
 260 /* valid event types */
 261 #define IEEE80211SOFTMAC_EVENT_ANY                      -1 /*private use only*/
 262 #define IEEE80211SOFTMAC_EVENT_SCAN_FINISHED            0
 263 #define IEEE80211SOFTMAC_EVENT_ASSOCIATED               1
 264 #define IEEE80211SOFTMAC_EVENT_ASSOCIATE_FAILED         2
 265 #define IEEE80211SOFTMAC_EVENT_ASSOCIATE_TIMEOUT        3
 266 #define IEEE80211SOFTMAC_EVENT_AUTHENTICATED            4
 267 #define IEEE80211SOFTMAC_EVENT_AUTH_FAILED              5
 268 #define IEEE80211SOFTMAC_EVENT_AUTH_TIMEOUT             6
 269 #define IEEE80211SOFTMAC_EVENT_ASSOCIATE_NET_NOT_FOUND  7
 270 /* keep this updated! */
 271 #define IEEE80211SOFTMAC_EVENT_LAST                     7
 272 /*
 273  * If you want to be notified of certain events, you can call
 274  * ieee80211softmac_notify[_atomic] with
 275  *      - event set to one of the constants below
 276  *      - fun set to a function pointer of the appropriate type
 277  *      - context set to the context data you want passed
 278  * The return value is 0, or an error.
 279  */
 280 typedef void (*notify_function_ptr)(struct net_device *dev, void *context);
 281
 282 #define ieee80211softmac_notify(dev, event, fun, context) ieee80211softmac_notify_gfp(dev, event, fun, context, GFP_KERNEL);
 283 #define ieee80211softmac_notify_atomic(dev, event, fun, context) ieee80211softmac_notify_gfp(dev, event, fun, context, GFP_ATOMIC);
 284
 285 extern int ieee80211softmac_notify_gfp(struct net_device *dev,
 286         int event, notify_function_ptr fun, void *context, gfp_t gfp_mask);
 287
 288 /* To clear pending work (for ifconfig down, etc.) */
 289 extern void
 290 ieee80211softmac_clear_pending_work(struct ieee80211softmac_device *sm);
 291
 292 #endif /* IEEE80211SOFTMAC_H_ */