drivers/net/wireless/iwlwifi/iwl-sta.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  * James P. Ketrenos <ipw2100-admin@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29
  30 #include <net/mac80211.h>
  31 #include <linux/etherdevice.h>
  32
  33 #include "iwl-eeprom.h"
  34 #include "iwl-dev.h"
  35 #include "iwl-core.h"
  36 #include "iwl-sta.h"
  37 #include "iwl-io.h"
  38 #include "iwl-helpers.h"
  39
  40 u8 iwl_find_station(struct iwl_priv *priv, const u8 *addr)
  41 {
  42         int i;
  43         int start = 0;
  44         int ret = IWL_INVALID_STATION;
  45         unsigned long flags;
  46         DECLARE_MAC_BUF(mac);
  47
  48         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) ||
  49             (priv->iw_mode == IEEE80211_IF_TYPE_AP))
  50                 start = IWL_STA_ID;
  51
  52         if (is_broadcast_ether_addr(addr))
  53                 return priv->hw_params.bcast_sta_id;
  54
  55         spin_lock_irqsave(&priv->sta_lock, flags);
  56         for (i = start; i < priv->hw_params.max_stations; i++)
  57                 if (priv->stations[i].used &&
  58                     (!compare_ether_addr(priv->stations[i].sta.sta.addr,
  59                                          addr))) {
  60                         ret = i;
  61                         goto out;
  62                 }
  63
  64         IWL_DEBUG_ASSOC_LIMIT("can not find STA %s total %d\n",
  65                               print_mac(mac, addr), priv->num_stations);
  66
  67  out:
  68         spin_unlock_irqrestore(&priv->sta_lock, flags);
  69         return ret;
  70 }
  71 EXPORT_SYMBOL(iwl_find_station);
  72
  73
  74 int iwl_get_free_ucode_key_index(struct iwl_priv *priv)
  75 {
  76         int i;
  77
  78         for (i = 0; i < STA_KEY_MAX_NUM; i++)
  79                 if (!test_and_set_bit(i, &priv->ucode_key_table))
  80                         return i;
  81
  82         return -1;
  83 }
  84
  85 int iwl_send_static_wepkey_cmd(struct iwl_priv *priv, u8 send_if_empty)
  86 {
  87         int i, not_empty = 0;
  88         u8 buff[sizeof(struct iwl_wep_cmd) +
  89                 sizeof(struct iwl_wep_key) * WEP_KEYS_MAX];
  90         struct iwl_wep_cmd *wep_cmd = (struct iwl_wep_cmd *)buff;
  91         size_t cmd_size  = sizeof(struct iwl_wep_cmd);
  92         struct iwl_host_cmd cmd = {
  93                 .id = REPLY_WEPKEY,
  94                 .data = wep_cmd,
  95                 .meta.flags = CMD_ASYNC,
  96         };
  97
  98         memset(wep_cmd, 0, cmd_size +
  99                         (sizeof(struct iwl_wep_key) * WEP_KEYS_MAX));
 100
 101         for (i = 0; i < WEP_KEYS_MAX ; i++) {
 102                 wep_cmd->key[i].key_index = i;
 103                 if (priv->wep_keys[i].key_size) {
 104                         wep_cmd->key[i].key_offset = i;
 105                         not_empty = 1;
 106                 } else {
 107                         wep_cmd->key[i].key_offset = WEP_INVALID_OFFSET;
 108                 }
 109
 110                 wep_cmd->key[i].key_size = priv->wep_keys[i].key_size;
 111                 memcpy(&wep_cmd->key[i].key[3], priv->wep_keys[i].key,
 112                                 priv->wep_keys[i].key_size);
 113         }
 114
 115         wep_cmd->global_key_type = WEP_KEY_WEP_TYPE;
 116         wep_cmd->num_keys = WEP_KEYS_MAX;
 117
 118         cmd_size += sizeof(struct iwl_wep_key) * WEP_KEYS_MAX;
 119
 120         cmd.len = cmd_size;
 121
 122         if (not_empty || send_if_empty)
 123                 return iwl_send_cmd(priv, &cmd);
 124         else
 125                 return 0;
 126 }
 127
 128 int iwl_remove_default_wep_key(struct iwl_priv *priv,
 129                                struct ieee80211_key_conf *keyconf)
 130 {
 131         int ret;
 132         unsigned long flags;
 133
 134         spin_lock_irqsave(&priv->sta_lock, flags);
 135
 136         if (!test_and_clear_bit(keyconf->keyidx, &priv->ucode_key_table))
 137                 IWL_ERROR("index %d not used in uCode key table.\n",
 138                           keyconf->keyidx);
 139
 140         priv->default_wep_key--;
 141         memset(&priv->wep_keys[keyconf->keyidx], 0, sizeof(priv->wep_keys[0]));
 142         ret = iwl_send_static_wepkey_cmd(priv, 1);
 143         spin_unlock_irqrestore(&priv->sta_lock, flags);
 144
 145         return ret;
 146 }
 147
 148 int iwl_set_default_wep_key(struct iwl_priv *priv,
 149                             struct ieee80211_key_conf *keyconf)
 150 {
 151         int ret;
 152         unsigned long flags;
 153
 154         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
 155         keyconf->hw_key_idx = keyconf->keyidx;
 156         priv->stations[IWL_AP_ID].keyinfo.alg = ALG_WEP;
 157
 158         spin_lock_irqsave(&priv->sta_lock, flags);
 159         priv->default_wep_key++;
 160
 161         if (test_and_set_bit(keyconf->keyidx, &priv->ucode_key_table))
 162                 IWL_ERROR("index %d already used in uCode key table.\n",
 163                         keyconf->keyidx);
 164
 165         priv->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
 166         memcpy(&priv->wep_keys[keyconf->keyidx].key, &keyconf->key,
 167                                                         keyconf->keylen);
 168
 169         ret = iwl_send_static_wepkey_cmd(priv, 0);
 170         spin_unlock_irqrestore(&priv->sta_lock, flags);
 171
 172         return ret;
 173 }
 174
 175 static int iwl_set_wep_dynamic_key_info(struct iwl_priv *priv,
 176                                 struct ieee80211_key_conf *keyconf,
 177                                 u8 sta_id)
 178 {
 179         unsigned long flags;
 180         __le16 key_flags = 0;
 181         int ret;
 182
 183         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
 184         keyconf->hw_key_idx = keyconf->keyidx;
 185
 186         key_flags |= (STA_KEY_FLG_WEP | STA_KEY_FLG_MAP_KEY_MSK);
 187         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 188         key_flags &= ~STA_KEY_FLG_INVALID;
 189
 190         if (keyconf->keylen == WEP_KEY_LEN_128)
 191                 key_flags |= STA_KEY_FLG_KEY_SIZE_MSK;
 192
 193         if (sta_id == priv->hw_params.bcast_sta_id)
 194                 key_flags |= STA_KEY_MULTICAST_MSK;
 195
 196         spin_lock_irqsave(&priv->sta_lock, flags);
 197
 198         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 199         priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
 200         priv->stations[sta_id].keyinfo.keyidx = keyconf->keyidx;
 201
 202         memcpy(priv->stations[sta_id].keyinfo.key,
 203                                 keyconf->key, keyconf->keylen);
 204
 205         memcpy(&priv->stations[sta_id].sta.key.key[3],
 206                                 keyconf->key, keyconf->keylen);
 207
 208         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 209                         == STA_KEY_FLG_NO_ENC)
 210                 priv->stations[sta_id].sta.key.key_offset =
 211                                  iwl_get_free_ucode_key_index(priv);
 212         /* else, we are overriding an existing key => no need to allocated room
 213          * in uCode. */
 214
 215         priv->stations[sta_id].sta.key.key_flags = key_flags;
 216         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 217         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 218
 219         ret = iwl4965_send_add_station(priv,
 220                 &priv->stations[sta_id].sta, CMD_ASYNC);
 221
 222         spin_unlock_irqrestore(&priv->sta_lock, flags);
 223
 224         return ret;
 225 }
 226
 227 static int iwl_set_ccmp_dynamic_key_info(struct iwl_priv *priv,
 228                                    struct ieee80211_key_conf *keyconf,
 229                                    u8 sta_id)
 230 {
 231         unsigned long flags;
 232         __le16 key_flags = 0;
 233
 234         key_flags |= (STA_KEY_FLG_CCMP | STA_KEY_FLG_MAP_KEY_MSK);
 235         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 236         key_flags &= ~STA_KEY_FLG_INVALID;
 237
 238         if (sta_id == priv->hw_params.bcast_sta_id)
 239                 key_flags |= STA_KEY_MULTICAST_MSK;
 240
 241         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 242         keyconf->hw_key_idx = keyconf->keyidx;
 243
 244         spin_lock_irqsave(&priv->sta_lock, flags);
 245         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 246         priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
 247
 248         memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key,
 249                keyconf->keylen);
 250
 251         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key,
 252                keyconf->keylen);
 253
 254         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 255                         == STA_KEY_FLG_NO_ENC)
 256                 priv->stations[sta_id].sta.key.key_offset =
 257                                  iwl_get_free_ucode_key_index(priv);
 258         /* else, we are overriding an existing key => no need to allocated room
 259          * in uCode. */
 260
 261         priv->stations[sta_id].sta.key.key_flags = key_flags;
 262         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 263         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 264
 265         spin_unlock_irqrestore(&priv->sta_lock, flags);
 266
 267         IWL_DEBUG_INFO("hwcrypto: modify ucode station key info\n");
 268         return iwl4965_send_add_station(priv,
 269                                 &priv->stations[sta_id].sta, CMD_ASYNC);
 270 }
 271
 272 static int iwl_set_tkip_dynamic_key_info(struct iwl_priv *priv,
 273                                    struct ieee80211_key_conf *keyconf,
 274                                    u8 sta_id)
 275 {
 276         unsigned long flags;
 277         int ret = 0;
 278
 279         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 280         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
 281         keyconf->hw_key_idx = keyconf->keyidx;
 282
 283         spin_lock_irqsave(&priv->sta_lock, flags);
 284
 285         priv->stations[sta_id].keyinfo.alg = keyconf->alg;
 286         priv->stations[sta_id].keyinfo.conf = keyconf;
 287         priv->stations[sta_id].keyinfo.keylen = 16;
 288
 289         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 290                         == STA_KEY_FLG_NO_ENC)
 291                 priv->stations[sta_id].sta.key.key_offset =
 292                                  iwl_get_free_ucode_key_index(priv);
 293         /* else, we are overriding an existing key => no need to allocated room
 294          * in uCode. */
 295
 296         /* This copy is acutally not needed: we get the key with each TX */
 297         memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key, 16);
 298
 299         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key, 16);
 300
 301         spin_unlock_irqrestore(&priv->sta_lock, flags);
 302
 303         return ret;
 304 }
 305
 306 int iwl_remove_dynamic_key(struct iwl_priv *priv,
 307                                 struct ieee80211_key_conf *keyconf,
 308                                 u8 sta_id)
 309 {
 310         unsigned long flags;
 311         int ret = 0;
 312         u16 key_flags;
 313         u8 keyidx;
 314
 315         priv->key_mapping_key = 0;
 316
 317         spin_lock_irqsave(&priv->sta_lock, flags);
 318         key_flags = le16_to_cpu(priv->stations[sta_id].sta.key.key_flags);
 319         keyidx = (key_flags >> STA_KEY_FLG_KEYID_POS) & 0x3;
 320
 321         if (keyconf->keyidx != keyidx) {
 322                 /* We need to remove a key with index different that the one
 323                  * in the uCode. This means that the key we need to remove has
 324                  * been replaced by another one with different index.
 325                  * Don't do anything and return ok
 326                  */
 327                 spin_unlock_irqrestore(&priv->sta_lock, flags);
 328                 return 0;
 329         }
 330
 331         if (!test_and_clear_bit(priv->stations[sta_id].sta.key.key_offset,
 332                 &priv->ucode_key_table))
 333                 IWL_ERROR("index %d not used in uCode key table.\n",
 334                         priv->stations[sta_id].sta.key.key_offset);
 335         memset(&priv->stations[sta_id].keyinfo, 0,
 336                                         sizeof(struct iwl4965_hw_key));
 337         memset(&priv->stations[sta_id].sta.key, 0,
 338                                         sizeof(struct iwl4965_keyinfo));
 339         priv->stations[sta_id].sta.key.key_flags =
 340                         STA_KEY_FLG_NO_ENC | STA_KEY_FLG_INVALID;
 341         priv->stations[sta_id].sta.key.key_offset = WEP_INVALID_OFFSET;
 342         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 343         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 344
 345         IWL_DEBUG_INFO("hwcrypto: clear ucode station key info\n");
 346         ret =  iwl4965_send_add_station(priv, &priv->stations[sta_id].sta, 0);
 347         spin_unlock_irqrestore(&priv->sta_lock, flags);
 348         return ret;
 349 }
 350
 351 int iwl_set_dynamic_key(struct iwl_priv *priv,
 352                                 struct ieee80211_key_conf *key, u8 sta_id)
 353 {
 354         int ret;
 355
 356         priv->key_mapping_key = 1;
 357
 358         switch (key->alg) {
 359         case ALG_CCMP:
 360                 ret = iwl_set_ccmp_dynamic_key_info(priv, key, sta_id);
 361                 break;
 362         case ALG_TKIP:
 363                 ret = iwl_set_tkip_dynamic_key_info(priv, key, sta_id);
 364                 break;
 365         case ALG_WEP:
 366                 ret = iwl_set_wep_dynamic_key_info(priv, key, sta_id);
 367                 break;
 368         default:
 369                 IWL_ERROR("Unknown alg: %s alg = %d\n", __func__, key->alg);
 370                 ret = -EINVAL;
 371         }
 372
 373         return ret;
 374 }
 375
 376 #ifdef CONFIG_IWLWIFI_DEBUG
 377 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
 378                            struct iwl_link_quality_cmd *lq)
 379 {
 380         int i;
 381         IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
 382         IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
 383                        lq->general_params.single_stream_ant_msk,
 384                        lq->general_params.dual_stream_ant_msk);
 385
 386         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 387                 IWL_DEBUG_RATE("lq index %d 0x%X\n",
 388                                i, lq->rs_table[i].rate_n_flags);
 389 }
 390 #else
 391 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
 392                                    struct iwl_link_quality_cmd *lq)
 393 {
 394 }
 395 #endif
 396
 397 int iwl_send_lq_cmd(struct iwl_priv *priv,
 398                     struct iwl_link_quality_cmd *lq, u8 flags)
 399 {
 400         struct iwl_host_cmd cmd = {
 401                 .id = REPLY_TX_LINK_QUALITY_CMD,
 402                 .len = sizeof(struct iwl_link_quality_cmd),
 403                 .meta.flags = flags,
 404                 .data = lq,
 405         };
 406
 407         if ((lq->sta_id == 0xFF) &&
 408             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
 409                 return -EINVAL;
 410
 411         if (lq->sta_id == 0xFF)
 412                 lq->sta_id = IWL_AP_ID;
 413
 414         iwl_dump_lq_cmd(priv,lq);
 415
 416         if (iwl_is_associated(priv) && priv->assoc_station_added &&
 417             priv->lq_mngr.lq_ready)
 418                 return  iwl_send_cmd(priv, &cmd);
 419
 420         return 0;
 421 }
 422 EXPORT_SYMBOL(iwl_send_lq_cmd);
 423