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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2010 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  *  Intel Linux Wireless <ilw@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 #include <linux/sched.h>
  33 #include <linux/lockdep.h>
  34
  35 #include "iwl-dev.h"
  36 #include "iwl-core.h"
  37 #include "iwl-sta.h"
  38
  39 /* priv->sta_lock must be held */
  40 static void iwl_sta_ucode_activate(struct iwl_priv *priv, u8 sta_id)
  41 {
  42
  43         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE))
  44                 IWL_ERR(priv, "ACTIVATE a non DRIVER active station id %u addr %pM\n",
  45                         sta_id, priv->stations[sta_id].sta.sta.addr);
  46
  47         if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
  48                 IWL_DEBUG_ASSOC(priv,
  49                                 "STA id %u addr %pM already present in uCode (according to driver)\n",
  50                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  51         } else {
  52                 priv->stations[sta_id].used |= IWL_STA_UCODE_ACTIVE;
  53                 IWL_DEBUG_ASSOC(priv, "Added STA id %u addr %pM to uCode\n",
  54                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  55         }
  56 }
  57
  58 static int iwl_process_add_sta_resp(struct iwl_priv *priv,
  59                                     struct iwl_addsta_cmd *addsta,
  60                                     struct iwl_rx_packet *pkt,
  61                                     bool sync)
  62 {
  63         u8 sta_id = addsta->sta.sta_id;
  64         unsigned long flags;
  65         int ret = -EIO;
  66
  67         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
  68                 IWL_ERR(priv, "Bad return from REPLY_ADD_STA (0x%08X)\n",
  69                         pkt->hdr.flags);
  70                 return ret;
  71         }
  72
  73         IWL_DEBUG_INFO(priv, "Processing response for adding station %u\n",
  74                        sta_id);
  75
  76         spin_lock_irqsave(&priv->sta_lock, flags);
  77
  78         switch (pkt->u.add_sta.status) {
  79         case ADD_STA_SUCCESS_MSK:
  80                 IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
  81                 iwl_sta_ucode_activate(priv, sta_id);
  82                 ret = 0;
  83                 break;
  84         case ADD_STA_NO_ROOM_IN_TABLE:
  85                 IWL_ERR(priv, "Adding station %d failed, no room in table.\n",
  86                         sta_id);
  87                 break;
  88         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
  89                 IWL_ERR(priv, "Adding station %d failed, no block ack resource.\n",
  90                         sta_id);
  91                 break;
  92         case ADD_STA_MODIFY_NON_EXIST_STA:
  93                 IWL_ERR(priv, "Attempting to modify non-existing station %d\n",
  94                         sta_id);
  95                 break;
  96         default:
  97                 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
  98                                 pkt->u.add_sta.status);
  99                 break;
 100         }
 101
 102         IWL_DEBUG_INFO(priv, "%s station id %u addr %pM\n",
 103                        priv->stations[sta_id].sta.mode ==
 104                        STA_CONTROL_MODIFY_MSK ?  "Modified" : "Added",
 105                        sta_id, priv->stations[sta_id].sta.sta.addr);
 106
 107         /*
 108          * XXX: The MAC address in the command buffer is often changed from
 109          * the original sent to the device. That is, the MAC address
 110          * written to the command buffer often is not the same MAC adress
 111          * read from the command buffer when the command returns. This
 112          * issue has not yet been resolved and this debugging is left to
 113          * observe the problem.
 114          */
 115         IWL_DEBUG_INFO(priv, "%s station according to cmd buffer %pM\n",
 116                        priv->stations[sta_id].sta.mode ==
 117                        STA_CONTROL_MODIFY_MSK ? "Modified" : "Added",
 118                        addsta->sta.addr);
 119         spin_unlock_irqrestore(&priv->sta_lock, flags);
 120
 121         return ret;
 122 }
 123
 124 static void iwl_add_sta_callback(struct iwl_priv *priv,
 125                                  struct iwl_device_cmd *cmd,
 126                                  struct iwl_rx_packet *pkt)
 127 {
 128         struct iwl_addsta_cmd *addsta =
 129                 (struct iwl_addsta_cmd *)cmd->cmd.payload;
 130
 131         iwl_process_add_sta_resp(priv, addsta, pkt, false);
 132
 133 }
 134
 135 int iwl_send_add_sta(struct iwl_priv *priv,
 136                      struct iwl_addsta_cmd *sta, u8 flags)
 137 {
 138         struct iwl_rx_packet *pkt = NULL;
 139         int ret = 0;
 140         u8 data[sizeof(*sta)];
 141         struct iwl_host_cmd cmd = {
 142                 .id = REPLY_ADD_STA,
 143                 .flags = flags,
 144                 .data = data,
 145         };
 146         u8 sta_id __maybe_unused = sta->sta.sta_id;
 147
 148         IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
 149                        sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 150
 151         if (flags & CMD_ASYNC)
 152                 cmd.callback = iwl_add_sta_callback;
 153         else {
 154                 cmd.flags |= CMD_WANT_SKB;
 155                 might_sleep();
 156         }
 157
 158         cmd.len = priv->cfg->ops->utils->build_addsta_hcmd(sta, data);
 159         ret = iwl_send_cmd(priv, &cmd);
 160
 161         if (ret || (flags & CMD_ASYNC))
 162                 return ret;
 163
 164         if (ret == 0) {
 165                 pkt = (struct iwl_rx_packet *)cmd.reply_page;
 166                 ret = iwl_process_add_sta_resp(priv, sta, pkt, true);
 167         }
 168         iwl_free_pages(priv, cmd.reply_page);
 169
 170         return ret;
 171 }
 172 EXPORT_SYMBOL(iwl_send_add_sta);
 173
 174 static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
 175                                    struct ieee80211_sta_ht_cap *sta_ht_inf)
 176 {
 177         __le32 sta_flags;
 178         u8 mimo_ps_mode;
 179
 180         if (!sta_ht_inf || !sta_ht_inf->ht_supported)
 181                 goto done;
 182
 183         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_SM_PS) >> 2;
 184         IWL_DEBUG_ASSOC(priv, "spatial multiplexing power save mode: %s\n",
 185                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_STATIC) ?
 186                         "static" :
 187                         (mimo_ps_mode == WLAN_HT_CAP_SM_PS_DYNAMIC) ?
 188                         "dynamic" : "disabled");
 189
 190         sta_flags = priv->stations[index].sta.station_flags;
 191
 192         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 193
 194         switch (mimo_ps_mode) {
 195         case WLAN_HT_CAP_SM_PS_STATIC:
 196                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
 197                 break;
 198         case WLAN_HT_CAP_SM_PS_DYNAMIC:
 199                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 200                 break;
 201         case WLAN_HT_CAP_SM_PS_DISABLED:
 202                 break;
 203         default:
 204                 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", mimo_ps_mode);
 205                 break;
 206         }
 207
 208         sta_flags |= cpu_to_le32(
 209               (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 210
 211         sta_flags |= cpu_to_le32(
 212               (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 213
 214         if (iwl_is_ht40_tx_allowed(priv, sta_ht_inf))
 215                 sta_flags |= STA_FLG_HT40_EN_MSK;
 216         else
 217                 sta_flags &= ~STA_FLG_HT40_EN_MSK;
 218
 219         priv->stations[index].sta.station_flags = sta_flags;
 220  done:
 221         return;
 222 }
 223
 224 /**
 225  * iwl_prep_station - Prepare station information for addition
 226  *
 227  * should be called with sta_lock held
 228  */
 229 static u8 iwl_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 230                            const u8 *addr, bool is_ap,
 231                            struct ieee80211_sta_ht_cap *ht_info)
 232 {
 233         struct iwl_station_entry *station;
 234         int i;
 235         u8 sta_id = IWL_INVALID_STATION;
 236         u16 rate;
 237
 238         if (is_ap)
 239                 sta_id = ctx->ap_sta_id;
 240         else if (is_broadcast_ether_addr(addr))
 241                 sta_id = ctx->bcast_sta_id;
 242         else
 243                 for (i = IWL_STA_ID; i < priv->hw_params.max_stations; i++) {
 244                         if (!compare_ether_addr(priv->stations[i].sta.sta.addr,
 245                                                 addr)) {
 246                                 sta_id = i;
 247                                 break;
 248                         }
 249
 250                         if (!priv->stations[i].used &&
 251                             sta_id == IWL_INVALID_STATION)
 252                                 sta_id = i;
 253                 }
 254
 255         /*
 256          * These two conditions have the same outcome, but keep them
 257          * separate
 258          */
 259         if (unlikely(sta_id == IWL_INVALID_STATION))
 260                 return sta_id;
 261
 262         /*
 263          * uCode is not able to deal with multiple requests to add a
 264          * station. Keep track if one is in progress so that we do not send
 265          * another.
 266          */
 267         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 268                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 269                                 sta_id);
 270                 return sta_id;
 271         }
 272
 273         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 274             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 275             !compare_ether_addr(priv->stations[sta_id].sta.sta.addr, addr)) {
 276                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 277                                 sta_id, addr);
 278                 return sta_id;
 279         }
 280
 281         station = &priv->stations[sta_id];
 282         station->used = IWL_STA_DRIVER_ACTIVE;
 283         IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
 284                         sta_id, addr);
 285         priv->num_stations++;
 286
 287         /* Set up the REPLY_ADD_STA command to send to device */
 288         memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
 289         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 290         station->sta.mode = 0;
 291         station->sta.sta.sta_id = sta_id;
 292         station->sta.station_flags = 0;
 293         station->ctxid = ctx->ctxid;
 294
 295         /*
 296          * OK to call unconditionally, since local stations (IBSS BSSID
 297          * STA and broadcast STA) pass in a NULL ht_info, and mac80211
 298          * doesn't allow HT IBSS.
 299          */
 300         iwl_set_ht_add_station(priv, sta_id, ht_info);
 301
 302         /* 3945 only */
 303         rate = (priv->band == IEEE80211_BAND_5GHZ) ?
 304                 IWL_RATE_6M_PLCP : IWL_RATE_1M_PLCP;
 305         /* Turn on both antennas for the station... */
 306         station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
 307
 308         return sta_id;
 309
 310 }
 311
 312 #define STA_WAIT_TIMEOUT (HZ/2)
 313
 314 /**
 315  * iwl_add_station_common -
 316  */
 317 int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 318                            const u8 *addr, bool is_ap,
 319                            struct ieee80211_sta_ht_cap *ht_info, u8 *sta_id_r)
 320 {
 321         unsigned long flags_spin;
 322         int ret = 0;
 323         u8 sta_id;
 324         struct iwl_addsta_cmd sta_cmd;
 325
 326         *sta_id_r = 0;
 327         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 328         sta_id = iwl_prep_station(priv, ctx, addr, is_ap, ht_info);
 329         if (sta_id == IWL_INVALID_STATION) {
 330                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 331                         addr);
 332                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 333                 return -EINVAL;
 334         }
 335
 336         /*
 337          * uCode is not able to deal with multiple requests to add a
 338          * station. Keep track if one is in progress so that we do not send
 339          * another.
 340          */
 341         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 342                 IWL_DEBUG_INFO(priv, "STA %d already in process of being added.\n",
 343                                sta_id);
 344                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 345                 return -EEXIST;
 346         }
 347
 348         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 349             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 350                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not adding again.\n",
 351                                 sta_id, addr);
 352                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 353                 return -EEXIST;
 354         }
 355
 356         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 357         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 358         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 359
 360         /* Add station to device's station table */
 361         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 362         if (ret) {
 363                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 364                 IWL_ERR(priv, "Adding station %pM failed.\n",
 365                         priv->stations[sta_id].sta.sta.addr);
 366                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 367                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 368                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 369         }
 370         *sta_id_r = sta_id;
 371         return ret;
 372 }
 373 EXPORT_SYMBOL(iwl_add_station_common);
 374
 375 static struct iwl_link_quality_cmd *iwl_sta_alloc_lq(struct iwl_priv *priv,
 376                                                      u8 sta_id)
 377 {
 378         int i, r;
 379         struct iwl_link_quality_cmd *link_cmd;
 380         u32 rate_flags;
 381
 382         link_cmd = kzalloc(sizeof(struct iwl_link_quality_cmd), GFP_KERNEL);
 383         if (!link_cmd) {
 384                 IWL_ERR(priv, "Unable to allocate memory for LQ cmd.\n");
 385                 return NULL;
 386         }
 387         /* Set up the rate scaling to start at selected rate, fall back
 388          * all the way down to 1M in IEEE order, and then spin on 1M */
 389         if (priv->band == IEEE80211_BAND_5GHZ)
 390                 r = IWL_RATE_6M_INDEX;
 391         else
 392                 r = IWL_RATE_1M_INDEX;
 393
 394         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 395                 rate_flags = 0;
 396                 if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
 397                         rate_flags |= RATE_MCS_CCK_MSK;
 398
 399                 rate_flags |= first_antenna(priv->hw_params.valid_tx_ant) <<
 400                                 RATE_MCS_ANT_POS;
 401
 402                 link_cmd->rs_table[i].rate_n_flags =
 403                         iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
 404                 r = iwl_get_prev_ieee_rate(r);
 405         }
 406
 407         link_cmd->general_params.single_stream_ant_msk =
 408                                 first_antenna(priv->hw_params.valid_tx_ant);
 409
 410         link_cmd->general_params.dual_stream_ant_msk =
 411                 priv->hw_params.valid_tx_ant &
 412                 ~first_antenna(priv->hw_params.valid_tx_ant);
 413         if (!link_cmd->general_params.dual_stream_ant_msk) {
 414                 link_cmd->general_params.dual_stream_ant_msk = ANT_AB;
 415         } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
 416                 link_cmd->general_params.dual_stream_ant_msk =
 417                         priv->hw_params.valid_tx_ant;
 418         }
 419
 420         link_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
 421         link_cmd->agg_params.agg_time_limit =
 422                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
 423
 424         link_cmd->sta_id = sta_id;
 425
 426         return link_cmd;
 427 }
 428
 429 /*
 430  * iwl_add_bssid_station - Add the special IBSS BSSID station
 431  *
 432  * Function sleeps.
 433  */
 434 int iwl_add_bssid_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 435                           const u8 *addr, bool init_rs, u8 *sta_id_r)
 436 {
 437         int ret;
 438         u8 sta_id;
 439         struct iwl_link_quality_cmd *link_cmd;
 440         unsigned long flags;
 441
 442         if (sta_id_r)
 443                 *sta_id_r = IWL_INVALID_STATION;
 444
 445         ret = iwl_add_station_common(priv, ctx, addr, 0, NULL, &sta_id);
 446         if (ret) {
 447                 IWL_ERR(priv, "Unable to add station %pM\n", addr);
 448                 return ret;
 449         }
 450
 451         if (sta_id_r)
 452                 *sta_id_r = sta_id;
 453
 454         spin_lock_irqsave(&priv->sta_lock, flags);
 455         priv->stations[sta_id].used |= IWL_STA_LOCAL;
 456         spin_unlock_irqrestore(&priv->sta_lock, flags);
 457
 458         if (init_rs) {
 459                 /* Set up default rate scaling table in device's station table */
 460                 link_cmd = iwl_sta_alloc_lq(priv, sta_id);
 461                 if (!link_cmd) {
 462                         IWL_ERR(priv, "Unable to initialize rate scaling for station %pM.\n",
 463                                 addr);
 464                         return -ENOMEM;
 465                 }
 466
 467                 ret = iwl_send_lq_cmd(priv, link_cmd, CMD_SYNC, true);
 468                 if (ret)
 469                         IWL_ERR(priv, "Link quality command failed (%d)\n", ret);
 470
 471                 spin_lock_irqsave(&priv->sta_lock, flags);
 472                 priv->stations[sta_id].lq = link_cmd;
 473                 spin_unlock_irqrestore(&priv->sta_lock, flags);
 474         }
 475
 476         return 0;
 477 }
 478 EXPORT_SYMBOL(iwl_add_bssid_station);
 479
 480 /**
 481  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 482  *
 483  * priv->sta_lock must be held
 484  */
 485 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 486 {
 487         /* Ucode must be active and driver must be non active */
 488         if ((priv->stations[sta_id].used &
 489              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) != IWL_STA_UCODE_ACTIVE)
 490                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 491
 492         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 493
 494         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 495         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 496 }
 497
 498 static int iwl_send_remove_station(struct iwl_priv *priv,
 499                                    const u8 *addr, int sta_id)
 500 {
 501         struct iwl_rx_packet *pkt;
 502         int ret;
 503
 504         unsigned long flags_spin;
 505         struct iwl_rem_sta_cmd rm_sta_cmd;
 506
 507         struct iwl_host_cmd cmd = {
 508                 .id = REPLY_REMOVE_STA,
 509                 .len = sizeof(struct iwl_rem_sta_cmd),
 510                 .flags = CMD_SYNC,
 511                 .data = &rm_sta_cmd,
 512         };
 513
 514         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 515         rm_sta_cmd.num_sta = 1;
 516         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 517
 518         cmd.flags |= CMD_WANT_SKB;
 519
 520         ret = iwl_send_cmd(priv, &cmd);
 521
 522         if (ret)
 523                 return ret;
 524
 525         pkt = (struct iwl_rx_packet *)cmd.reply_page;
 526         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 527                 IWL_ERR(priv, "Bad return from REPLY_REMOVE_STA (0x%08X)\n",
 528                           pkt->hdr.flags);
 529                 ret = -EIO;
 530         }
 531
 532         if (!ret) {
 533                 switch (pkt->u.rem_sta.status) {
 534                 case REM_STA_SUCCESS_MSK:
 535                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 536                         iwl_sta_ucode_deactivate(priv, sta_id);
 537                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 538                         IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 539                         break;
 540                 default:
 541                         ret = -EIO;
 542                         IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 543                         break;
 544                 }
 545         }
 546         iwl_free_pages(priv, cmd.reply_page);
 547
 548         return ret;
 549 }
 550
 551 /**
 552  * iwl_remove_station - Remove driver's knowledge of station.
 553  */
 554 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
 555                        const u8 *addr)
 556 {
 557         unsigned long flags;
 558
 559         if (!iwl_is_ready(priv)) {
 560                 IWL_DEBUG_INFO(priv,
 561                         "Unable to remove station %pM, device not ready.\n",
 562                         addr);
 563                 /*
 564                  * It is typical for stations to be removed when we are
 565                  * going down. Return success since device will be down
 566                  * soon anyway
 567                  */
 568                 return 0;
 569         }
 570
 571         IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 572                         sta_id, addr);
 573
 574         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 575                 return -EINVAL;
 576
 577         spin_lock_irqsave(&priv->sta_lock, flags);
 578
 579         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 580                 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 581                                 addr);
 582                 goto out_err;
 583         }
 584
 585         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 586                 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 587                                 addr);
 588                 goto out_err;
 589         }
 590
 591         if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 592                 kfree(priv->stations[sta_id].lq);
 593                 priv->stations[sta_id].lq = NULL;
 594         }
 595
 596         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 597
 598         priv->num_stations--;
 599
 600         BUG_ON(priv->num_stations < 0);
 601
 602         spin_unlock_irqrestore(&priv->sta_lock, flags);
 603
 604         return iwl_send_remove_station(priv, addr, sta_id);
 605 out_err:
 606         spin_unlock_irqrestore(&priv->sta_lock, flags);
 607         return -EINVAL;
 608 }
 609 EXPORT_SYMBOL_GPL(iwl_remove_station);
 610
 611 /**
 612  * iwl_clear_ucode_stations - clear ucode station table bits
 613  *
 614  * This function clears all the bits in the driver indicating
 615  * which stations are active in the ucode. Call when something
 616  * other than explicit station management would cause this in
 617  * the ucode, e.g. unassociated RXON.
 618  */
 619 void iwl_clear_ucode_stations(struct iwl_priv *priv,
 620                               struct iwl_rxon_context *ctx)
 621 {
 622         int i;
 623         unsigned long flags_spin;
 624         bool cleared = false;
 625
 626         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 627
 628         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 629         for (i = 0; i < priv->hw_params.max_stations; i++) {
 630                 if (ctx && ctx->ctxid != priv->stations[i].ctxid)
 631                         continue;
 632
 633                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 634                         IWL_DEBUG_INFO(priv, "Clearing ucode active for station %d\n", i);
 635                         priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 636                         cleared = true;
 637                 }
 638         }
 639         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 640
 641         if (!cleared)
 642                 IWL_DEBUG_INFO(priv, "No active stations found to be cleared\n");
 643 }
 644 EXPORT_SYMBOL(iwl_clear_ucode_stations);
 645
 646 /**
 647  * iwl_restore_stations() - Restore driver known stations to device
 648  *
 649  * All stations considered active by driver, but not present in ucode, is
 650  * restored.
 651  *
 652  * Function sleeps.
 653  */
 654 void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 655 {
 656         struct iwl_addsta_cmd sta_cmd;
 657         struct iwl_link_quality_cmd lq;
 658         unsigned long flags_spin;
 659         int i;
 660         bool found = false;
 661         int ret;
 662         bool send_lq;
 663
 664         if (!iwl_is_ready(priv)) {
 665                 IWL_DEBUG_INFO(priv, "Not ready yet, not restoring any stations.\n");
 666                 return;
 667         }
 668
 669         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 670         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 671         for (i = 0; i < priv->hw_params.max_stations; i++) {
 672                 if (ctx->ctxid != priv->stations[i].ctxid)
 673                         continue;
 674                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 675                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 676                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 677                                         priv->stations[i].sta.sta.addr);
 678                         priv->stations[i].sta.mode = 0;
 679                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 680                         found = true;
 681                 }
 682         }
 683
 684         for (i = 0; i < priv->hw_params.max_stations; i++) {
 685                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 686                         memcpy(&sta_cmd, &priv->stations[i].sta,
 687                                sizeof(struct iwl_addsta_cmd));
 688                         send_lq = false;
 689                         if (priv->stations[i].lq) {
 690                                 memcpy(&lq, priv->stations[i].lq,
 691                                        sizeof(struct iwl_link_quality_cmd));
 692                                 send_lq = true;
 693                         }
 694                         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 695                         ret = iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 696                         if (ret) {
 697                                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
 698                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 699                                         priv->stations[i].sta.sta.addr);
 700                                 priv->stations[i].used &= ~IWL_STA_DRIVER_ACTIVE;
 701                                 priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 702                                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 703                         }
 704                         /*
 705                          * Rate scaling has already been initialized, send
 706                          * current LQ command
 707                          */
 708                         if (send_lq)
 709                                 iwl_send_lq_cmd(priv, &lq, CMD_SYNC, true);
 710                         spin_lock_irqsave(&priv->sta_lock, flags_spin);
 711                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 712                 }
 713         }
 714
 715         spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
 716         if (!found)
 717                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... no stations to be restored.\n");
 718         else
 719                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... complete.\n");
 720 }
 721 EXPORT_SYMBOL(iwl_restore_stations);
 722
 723 int iwl_get_free_ucode_key_index(struct iwl_priv *priv)
 724 {
 725         int i;
 726
 727         for (i = 0; i < priv->sta_key_max_num; i++)
 728                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 729                         return i;
 730
 731         return WEP_INVALID_OFFSET;
 732 }
 733 EXPORT_SYMBOL(iwl_get_free_ucode_key_index);
 734
 735 static int iwl_send_static_wepkey_cmd(struct iwl_priv *priv,
 736                                       struct iwl_rxon_context *ctx,
 737                                       bool send_if_empty)
 738 {
 739         int i, not_empty = 0;
 740         u8 buff[sizeof(struct iwl_wep_cmd) +
 741                 sizeof(struct iwl_wep_key) * WEP_KEYS_MAX];
 742         struct iwl_wep_cmd *wep_cmd = (struct iwl_wep_cmd *)buff;
 743         size_t cmd_size  = sizeof(struct iwl_wep_cmd);
 744         struct iwl_host_cmd cmd = {
 745                 .id = ctx->wep_key_cmd,
 746                 .data = wep_cmd,
 747                 .flags = CMD_SYNC,
 748         };
 749
 750         might_sleep();
 751
 752         memset(wep_cmd, 0, cmd_size +
 753                         (sizeof(struct iwl_wep_key) * WEP_KEYS_MAX));
 754
 755         for (i = 0; i < WEP_KEYS_MAX ; i++) {
 756                 wep_cmd->key[i].key_index = i;
 757                 if (ctx->wep_keys[i].key_size) {
 758                         wep_cmd->key[i].key_offset = i;
 759                         not_empty = 1;
 760                 } else {
 761                         wep_cmd->key[i].key_offset = WEP_INVALID_OFFSET;
 762                 }
 763
 764                 wep_cmd->key[i].key_size = ctx->wep_keys[i].key_size;
 765                 memcpy(&wep_cmd->key[i].key[3], ctx->wep_keys[i].key,
 766                                 ctx->wep_keys[i].key_size);
 767         }
 768
 769         wep_cmd->global_key_type = WEP_KEY_WEP_TYPE;
 770         wep_cmd->num_keys = WEP_KEYS_MAX;
 771
 772         cmd_size += sizeof(struct iwl_wep_key) * WEP_KEYS_MAX;
 773
 774         cmd.len = cmd_size;
 775
 776         if (not_empty || send_if_empty)
 777                 return iwl_send_cmd(priv, &cmd);
 778         else
 779                 return 0;
 780 }
 781
 782 int iwl_restore_default_wep_keys(struct iwl_priv *priv,
 783                                  struct iwl_rxon_context *ctx)
 784 {
 785         lockdep_assert_held(&priv->mutex);
 786
 787         return iwl_send_static_wepkey_cmd(priv, ctx, false);
 788 }
 789 EXPORT_SYMBOL(iwl_restore_default_wep_keys);
 790
 791 int iwl_remove_default_wep_key(struct iwl_priv *priv,
 792                                struct iwl_rxon_context *ctx,
 793                                struct ieee80211_key_conf *keyconf)
 794 {
 795         int ret;
 796
 797         lockdep_assert_held(&priv->mutex);
 798
 799         IWL_DEBUG_WEP(priv, "Removing default WEP key: idx=%d\n",
 800                       keyconf->keyidx);
 801
 802         memset(&ctx->wep_keys[keyconf->keyidx], 0, sizeof(ctx->wep_keys[0]));
 803         if (iwl_is_rfkill(priv)) {
 804                 IWL_DEBUG_WEP(priv, "Not sending REPLY_WEPKEY command due to RFKILL.\n");
 805                 /* but keys in device are clear anyway so return success */
 806                 return 0;
 807         }
 808         ret = iwl_send_static_wepkey_cmd(priv, ctx, 1);
 809         IWL_DEBUG_WEP(priv, "Remove default WEP key: idx=%d ret=%d\n",
 810                       keyconf->keyidx, ret);
 811
 812         return ret;
 813 }
 814 EXPORT_SYMBOL(iwl_remove_default_wep_key);
 815
 816 int iwl_set_default_wep_key(struct iwl_priv *priv,
 817                             struct iwl_rxon_context *ctx,
 818                             struct ieee80211_key_conf *keyconf)
 819 {
 820         int ret;
 821
 822         lockdep_assert_held(&priv->mutex);
 823
 824         if (keyconf->keylen != WEP_KEY_LEN_128 &&
 825             keyconf->keylen != WEP_KEY_LEN_64) {
 826                 IWL_DEBUG_WEP(priv, "Bad WEP key length %d\n", keyconf->keylen);
 827                 return -EINVAL;
 828         }
 829
 830         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
 831         keyconf->hw_key_idx = HW_KEY_DEFAULT;
 832         priv->stations[ctx->ap_sta_id].keyinfo.cipher = keyconf->cipher;
 833
 834         ctx->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
 835         memcpy(&ctx->wep_keys[keyconf->keyidx].key, &keyconf->key,
 836                                                         keyconf->keylen);
 837
 838         ret = iwl_send_static_wepkey_cmd(priv, ctx, false);
 839         IWL_DEBUG_WEP(priv, "Set default WEP key: len=%d idx=%d ret=%d\n",
 840                 keyconf->keylen, keyconf->keyidx, ret);
 841
 842         return ret;
 843 }
 844 EXPORT_SYMBOL(iwl_set_default_wep_key);
 845
 846 static int iwl_set_wep_dynamic_key_info(struct iwl_priv *priv,
 847                                         struct iwl_rxon_context *ctx,
 848                                         struct ieee80211_key_conf *keyconf,
 849                                         u8 sta_id)
 850 {
 851         unsigned long flags;
 852         __le16 key_flags = 0;
 853         struct iwl_addsta_cmd sta_cmd;
 854
 855         lockdep_assert_held(&priv->mutex);
 856
 857         keyconf->flags &= ~IEEE80211_KEY_FLAG_GENERATE_IV;
 858
 859         key_flags |= (STA_KEY_FLG_WEP | STA_KEY_FLG_MAP_KEY_MSK);
 860         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 861         key_flags &= ~STA_KEY_FLG_INVALID;
 862
 863         if (keyconf->keylen == WEP_KEY_LEN_128)
 864                 key_flags |= STA_KEY_FLG_KEY_SIZE_MSK;
 865
 866         if (sta_id == ctx->bcast_sta_id)
 867                 key_flags |= STA_KEY_MULTICAST_MSK;
 868
 869         spin_lock_irqsave(&priv->sta_lock, flags);
 870
 871         priv->stations[sta_id].keyinfo.cipher = keyconf->cipher;
 872         priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
 873         priv->stations[sta_id].keyinfo.keyidx = keyconf->keyidx;
 874
 875         memcpy(priv->stations[sta_id].keyinfo.key,
 876                                 keyconf->key, keyconf->keylen);
 877
 878         memcpy(&priv->stations[sta_id].sta.key.key[3],
 879                                 keyconf->key, keyconf->keylen);
 880
 881         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 882                         == STA_KEY_FLG_NO_ENC)
 883                 priv->stations[sta_id].sta.key.key_offset =
 884                                  iwl_get_free_ucode_key_index(priv);
 885         /* else, we are overriding an existing key => no need to allocated room
 886          * in uCode. */
 887
 888         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 889                 "no space for a new key");
 890
 891         priv->stations[sta_id].sta.key.key_flags = key_flags;
 892         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 893         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 894
 895         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 896         spin_unlock_irqrestore(&priv->sta_lock, flags);
 897
 898         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 899 }
 900
 901 static int iwl_set_ccmp_dynamic_key_info(struct iwl_priv *priv,
 902                                          struct iwl_rxon_context *ctx,
 903                                          struct ieee80211_key_conf *keyconf,
 904                                          u8 sta_id)
 905 {
 906         unsigned long flags;
 907         __le16 key_flags = 0;
 908         struct iwl_addsta_cmd sta_cmd;
 909
 910         lockdep_assert_held(&priv->mutex);
 911
 912         key_flags |= (STA_KEY_FLG_CCMP | STA_KEY_FLG_MAP_KEY_MSK);
 913         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 914         key_flags &= ~STA_KEY_FLG_INVALID;
 915
 916         if (sta_id == ctx->bcast_sta_id)
 917                 key_flags |= STA_KEY_MULTICAST_MSK;
 918
 919         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 920
 921         spin_lock_irqsave(&priv->sta_lock, flags);
 922         priv->stations[sta_id].keyinfo.cipher = keyconf->cipher;
 923         priv->stations[sta_id].keyinfo.keylen = keyconf->keylen;
 924
 925         memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key,
 926                keyconf->keylen);
 927
 928         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key,
 929                keyconf->keylen);
 930
 931         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 932                         == STA_KEY_FLG_NO_ENC)
 933                 priv->stations[sta_id].sta.key.key_offset =
 934                                  iwl_get_free_ucode_key_index(priv);
 935         /* else, we are overriding an existing key => no need to allocated room
 936          * in uCode. */
 937
 938         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 939                 "no space for a new key");
 940
 941         priv->stations[sta_id].sta.key.key_flags = key_flags;
 942         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
 943         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
 944
 945         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
 946         spin_unlock_irqrestore(&priv->sta_lock, flags);
 947
 948         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
 949 }
 950
 951 static int iwl_set_tkip_dynamic_key_info(struct iwl_priv *priv,
 952                                          struct iwl_rxon_context *ctx,
 953                                          struct ieee80211_key_conf *keyconf,
 954                                          u8 sta_id)
 955 {
 956         unsigned long flags;
 957         int ret = 0;
 958         __le16 key_flags = 0;
 959
 960         key_flags |= (STA_KEY_FLG_TKIP | STA_KEY_FLG_MAP_KEY_MSK);
 961         key_flags |= cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
 962         key_flags &= ~STA_KEY_FLG_INVALID;
 963
 964         if (sta_id == ctx->bcast_sta_id)
 965                 key_flags |= STA_KEY_MULTICAST_MSK;
 966
 967         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
 968         keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
 969
 970         spin_lock_irqsave(&priv->sta_lock, flags);
 971
 972         priv->stations[sta_id].keyinfo.cipher = keyconf->cipher;
 973         priv->stations[sta_id].keyinfo.keylen = 16;
 974
 975         if ((priv->stations[sta_id].sta.key.key_flags & STA_KEY_FLG_ENCRYPT_MSK)
 976                         == STA_KEY_FLG_NO_ENC)
 977                 priv->stations[sta_id].sta.key.key_offset =
 978                                  iwl_get_free_ucode_key_index(priv);
 979         /* else, we are overriding an existing key => no need to allocated room
 980          * in uCode. */
 981
 982         WARN(priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET,
 983                 "no space for a new key");
 984
 985         priv->stations[sta_id].sta.key.key_flags = key_flags;
 986
 987
 988         /* This copy is acutally not needed: we get the key with each TX */
 989         memcpy(priv->stations[sta_id].keyinfo.key, keyconf->key, 16);
 990
 991         memcpy(priv->stations[sta_id].sta.key.key, keyconf->key, 16);
 992
 993         spin_unlock_irqrestore(&priv->sta_lock, flags);
 994
 995         return ret;
 996 }
 997
 998 void iwl_update_tkip_key(struct iwl_priv *priv,
 999                          struct iwl_rxon_context *ctx,
1000                          struct ieee80211_key_conf *keyconf,
1001                          struct ieee80211_sta *sta, u32 iv32, u16 *phase1key)
1002 {
1003         u8 sta_id;
1004         unsigned long flags;
1005         int i;
1006
1007         if (iwl_scan_cancel(priv)) {
1008                 /* cancel scan failed, just live w/ bad key and rely
1009                    briefly on SW decryption */
1010                 return;
1011         }
1012
1013         sta_id = iwl_sta_id_or_broadcast(priv, ctx, sta);
1014         if (sta_id == IWL_INVALID_STATION)
1015                 return;
1016
1017         spin_lock_irqsave(&priv->sta_lock, flags);
1018
1019         priv->stations[sta_id].sta.key.tkip_rx_tsc_byte2 = (u8) iv32;
1020
1021         for (i = 0; i < 5; i++)
1022                 priv->stations[sta_id].sta.key.tkip_rx_ttak[i] =
1023                         cpu_to_le16(phase1key[i]);
1024
1025         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
1026         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1027
1028         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1029
1030         spin_unlock_irqrestore(&priv->sta_lock, flags);
1031
1032 }
1033 EXPORT_SYMBOL(iwl_update_tkip_key);
1034
1035 int iwl_remove_dynamic_key(struct iwl_priv *priv,
1036                            struct iwl_rxon_context *ctx,
1037                            struct ieee80211_key_conf *keyconf,
1038                            u8 sta_id)
1039 {
1040         unsigned long flags;
1041         u16 key_flags;
1042         u8 keyidx;
1043         struct iwl_addsta_cmd sta_cmd;
1044
1045         lockdep_assert_held(&priv->mutex);
1046
1047         ctx->key_mapping_keys--;
1048
1049         spin_lock_irqsave(&priv->sta_lock, flags);
1050         key_flags = le16_to_cpu(priv->stations[sta_id].sta.key.key_flags);
1051         keyidx = (key_flags >> STA_KEY_FLG_KEYID_POS) & 0x3;
1052
1053         IWL_DEBUG_WEP(priv, "Remove dynamic key: idx=%d sta=%d\n",
1054                       keyconf->keyidx, sta_id);
1055
1056         if (keyconf->keyidx != keyidx) {
1057                 /* We need to remove a key with index different that the one
1058                  * in the uCode. This means that the key we need to remove has
1059                  * been replaced by another one with different index.
1060                  * Don't do anything and return ok
1061                  */
1062                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1063                 return 0;
1064         }
1065
1066         if (priv->stations[sta_id].sta.key.key_offset == WEP_INVALID_OFFSET) {
1067                 IWL_WARN(priv, "Removing wrong key %d 0x%x\n",
1068                             keyconf->keyidx, key_flags);
1069                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1070                 return 0;
1071         }
1072
1073         if (!test_and_clear_bit(priv->stations[sta_id].sta.key.key_offset,
1074                 &priv->ucode_key_table))
1075                 IWL_ERR(priv, "index %d not used in uCode key table.\n",
1076                         priv->stations[sta_id].sta.key.key_offset);
1077         memset(&priv->stations[sta_id].keyinfo, 0,
1078                                         sizeof(struct iwl_hw_key));
1079         memset(&priv->stations[sta_id].sta.key, 0,
1080                                         sizeof(struct iwl4965_keyinfo));
1081         priv->stations[sta_id].sta.key.key_flags =
1082                         STA_KEY_FLG_NO_ENC | STA_KEY_FLG_INVALID;
1083         priv->stations[sta_id].sta.key.key_offset = WEP_INVALID_OFFSET;
1084         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_KEY_MASK;
1085         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1086
1087         if (iwl_is_rfkill(priv)) {
1088                 IWL_DEBUG_WEP(priv, "Not sending REPLY_ADD_STA command because RFKILL enabled.\n");
1089                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1090                 return 0;
1091         }
1092         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1093         spin_unlock_irqrestore(&priv->sta_lock, flags);
1094
1095         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
1096 }
1097 EXPORT_SYMBOL(iwl_remove_dynamic_key);
1098
1099 int iwl_set_dynamic_key(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
1100                         struct ieee80211_key_conf *keyconf, u8 sta_id)
1101 {
1102         int ret;
1103
1104         lockdep_assert_held(&priv->mutex);
1105
1106         ctx->key_mapping_keys++;
1107         keyconf->hw_key_idx = HW_KEY_DYNAMIC;
1108
1109         switch (keyconf->cipher) {
1110         case WLAN_CIPHER_SUITE_CCMP:
1111                 ret = iwl_set_ccmp_dynamic_key_info(priv, ctx, keyconf, sta_id);
1112                 break;
1113         case WLAN_CIPHER_SUITE_TKIP:
1114                 ret = iwl_set_tkip_dynamic_key_info(priv, ctx, keyconf, sta_id);
1115                 break;
1116         case WLAN_CIPHER_SUITE_WEP40:
1117         case WLAN_CIPHER_SUITE_WEP104:
1118                 ret = iwl_set_wep_dynamic_key_info(priv, ctx, keyconf, sta_id);
1119                 break;
1120         default:
1121                 IWL_ERR(priv,
1122                         "Unknown alg: %s cipher = %x\n", __func__,
1123                         keyconf->cipher);
1124                 ret = -EINVAL;
1125         }
1126
1127         IWL_DEBUG_WEP(priv, "Set dynamic key: cipher=%x len=%d idx=%d sta=%d ret=%d\n",
1128                       keyconf->cipher, keyconf->keylen, keyconf->keyidx,
1129                       sta_id, ret);
1130
1131         return ret;
1132 }
1133 EXPORT_SYMBOL(iwl_set_dynamic_key);
1134
1135 #ifdef CONFIG_IWLWIFI_DEBUG
1136 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
1137                            struct iwl_link_quality_cmd *lq)
1138 {
1139         int i;
1140         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
1141         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
1142                        lq->general_params.single_stream_ant_msk,
1143                        lq->general_params.dual_stream_ant_msk);
1144
1145         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
1146                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
1147                                i, lq->rs_table[i].rate_n_flags);
1148 }
1149 #else
1150 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
1151                                    struct iwl_link_quality_cmd *lq)
1152 {
1153 }
1154 #endif
1155
1156 /**
1157  * is_lq_table_valid() - Test one aspect of LQ cmd for validity
1158  *
1159  * It sometimes happens when a HT rate has been in use and we
1160  * loose connectivity with AP then mac80211 will first tell us that the
1161  * current channel is not HT anymore before removing the station. In such a
1162  * scenario the RXON flags will be updated to indicate we are not
1163  * communicating HT anymore, but the LQ command may still contain HT rates.
1164  * Test for this to prevent driver from sending LQ command between the time
1165  * RXON flags are updated and when LQ command is updated.
1166  */
1167 static bool is_lq_table_valid(struct iwl_priv *priv,
1168                               struct iwl_link_quality_cmd *lq)
1169 {
1170         int i;
1171         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
1172 #if !TODO
1173         struct iwl_rxon_context *ctx =
1174                         &priv->contexts[IWL_RXON_CTX_BSS];
1175 #endif
1176
1177         if (ht_conf->is_ht)
1178                 return true;
1179
1180         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
1181                        ctx->active.channel);
1182         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
1183                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
1184                         IWL_DEBUG_INFO(priv,
1185                                        "index %d of LQ expects HT channel\n",
1186                                        i);
1187                         return false;
1188                 }
1189         }
1190         return true;
1191 }
1192
1193 /**
1194  * iwl_send_lq_cmd() - Send link quality command
1195  * @init: This command is sent as part of station initialization right
1196  *        after station has been added.
1197  *
1198  * The link quality command is sent as the last step of station creation.
1199  * This is the special case in which init is set and we call a callback in
1200  * this case to clear the state indicating that station creation is in
1201  * progress.
1202  */
1203 int iwl_send_lq_cmd(struct iwl_priv *priv,
1204                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
1205 {
1206         int ret = 0;
1207         unsigned long flags_spin;
1208
1209         struct iwl_host_cmd cmd = {
1210                 .id = REPLY_TX_LINK_QUALITY_CMD,
1211                 .len = sizeof(struct iwl_link_quality_cmd),
1212                 .flags = flags,
1213                 .data = lq,
1214         };
1215
1216         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
1217                 return -EINVAL;
1218
1219         iwl_dump_lq_cmd(priv, lq);
1220         BUG_ON(init && (cmd.flags & CMD_ASYNC));
1221
1222         if (is_lq_table_valid(priv, lq))
1223                 ret = iwl_send_cmd(priv, &cmd);
1224         else
1225                 ret = -EINVAL;
1226
1227         if (cmd.flags & CMD_ASYNC)
1228                 return ret;
1229
1230         if (init) {
1231                 IWL_DEBUG_INFO(priv, "init LQ command complete, clearing sta addition status for sta %d\n",
1232                                lq->sta_id);
1233                 spin_lock_irqsave(&priv->sta_lock, flags_spin);
1234                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
1235                 spin_unlock_irqrestore(&priv->sta_lock, flags_spin);
1236         }
1237         return ret;
1238 }
1239 EXPORT_SYMBOL(iwl_send_lq_cmd);
1240
1241 /**
1242  * iwl_alloc_bcast_station - add broadcast station into driver's station table.
1243  *
1244  * This adds the broadcast station into the driver's station table
1245  * and marks it driver active, so that it will be restored to the
1246  * device at the next best time.
1247  */
1248 int iwl_alloc_bcast_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
1249                             bool init_lq)
1250 {
1251         struct iwl_link_quality_cmd *link_cmd;
1252         unsigned long flags;
1253         u8 sta_id;
1254
1255         spin_lock_irqsave(&priv->sta_lock, flags);
1256         sta_id = iwl_prep_station(priv, ctx, iwl_bcast_addr, false, NULL);
1257         if (sta_id == IWL_INVALID_STATION) {
1258                 IWL_ERR(priv, "Unable to prepare broadcast station\n");
1259                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1260
1261                 return -EINVAL;
1262         }
1263
1264         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
1265         priv->stations[sta_id].used |= IWL_STA_BCAST;
1266         spin_unlock_irqrestore(&priv->sta_lock, flags);
1267
1268         if (init_lq) {
1269                 link_cmd = iwl_sta_alloc_lq(priv, sta_id);
1270                 if (!link_cmd) {
1271                         IWL_ERR(priv,
1272                                 "Unable to initialize rate scaling for bcast station.\n");
1273                         return -ENOMEM;
1274                 }
1275
1276                 spin_lock_irqsave(&priv->sta_lock, flags);
1277                 priv->stations[sta_id].lq = link_cmd;
1278                 spin_unlock_irqrestore(&priv->sta_lock, flags);
1279         }
1280
1281         return 0;
1282 }
1283 EXPORT_SYMBOL_GPL(iwl_alloc_bcast_station);
1284
1285 /**
1286  * iwl_update_bcast_station - update broadcast station's LQ command
1287  *
1288  * Only used by iwlagn. Placed here to have all bcast station management
1289  * code together.
1290  */
1291 static int iwl_update_bcast_station(struct iwl_priv *priv,
1292                                     struct iwl_rxon_context *ctx)
1293 {
1294         unsigned long flags;
1295         struct iwl_link_quality_cmd *link_cmd;
1296         u8 sta_id = ctx->bcast_sta_id;
1297
1298         link_cmd = iwl_sta_alloc_lq(priv, sta_id);
1299         if (!link_cmd) {
1300                 IWL_ERR(priv, "Unable to initialize rate scaling for bcast station.\n");
1301                 return -ENOMEM;
1302         }
1303
1304         spin_lock_irqsave(&priv->sta_lock, flags);
1305         if (priv->stations[sta_id].lq)
1306                 kfree(priv->stations[sta_id].lq);
1307         else
1308                 IWL_DEBUG_INFO(priv, "Bcast station rate scaling has not been initialized yet.\n");
1309         priv->stations[sta_id].lq = link_cmd;
1310         spin_unlock_irqrestore(&priv->sta_lock, flags);
1311
1312         return 0;
1313 }
1314
1315 int iwl_update_bcast_stations(struct iwl_priv *priv)
1316 {
1317         struct iwl_rxon_context *ctx;
1318         int ret = 0;
1319
1320         for_each_context(priv, ctx) {
1321                 ret = iwl_update_bcast_station(priv, ctx);
1322                 if (ret)
1323                         break;
1324         }
1325
1326         return ret;
1327 }
1328 EXPORT_SYMBOL_GPL(iwl_update_bcast_stations);
1329
1330 void iwl_dealloc_bcast_stations(struct iwl_priv *priv)
1331 {
1332         unsigned long flags;
1333         int i;
1334
1335         spin_lock_irqsave(&priv->sta_lock, flags);
1336         for (i = 0; i < priv->hw_params.max_stations; i++) {
1337                 if (!(priv->stations[i].used & IWL_STA_BCAST))
1338                         continue;
1339
1340                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
1341                 priv->num_stations--;
1342                 BUG_ON(priv->num_stations < 0);
1343                 kfree(priv->stations[i].lq);
1344                 priv->stations[i].lq = NULL;
1345         }
1346         spin_unlock_irqrestore(&priv->sta_lock, flags);
1347 }
1348 EXPORT_SYMBOL_GPL(iwl_dealloc_bcast_stations);
1349
1350 /**
1351  * iwl_sta_tx_modify_enable_tid - Enable Tx for this TID in station table
1352  */
1353 int iwl_sta_tx_modify_enable_tid(struct iwl_priv *priv, int sta_id, int tid)
1354 {
1355         unsigned long flags;
1356         struct iwl_addsta_cmd sta_cmd;
1357
1358         lockdep_assert_held(&priv->mutex);
1359
1360         /* Remove "disable" flag, to enable Tx for this TID */
1361         spin_lock_irqsave(&priv->sta_lock, flags);
1362         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_TID_DISABLE_TX;
1363         priv->stations[sta_id].sta.tid_disable_tx &= cpu_to_le16(~(1 << tid));
1364         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1365         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1366         spin_unlock_irqrestore(&priv->sta_lock, flags);
1367
1368         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
1369 }
1370 EXPORT_SYMBOL(iwl_sta_tx_modify_enable_tid);
1371
1372 int iwl_sta_rx_agg_start(struct iwl_priv *priv, struct ieee80211_sta *sta,
1373                          int tid, u16 ssn)
1374 {
1375         unsigned long flags;
1376         int sta_id;
1377         struct iwl_addsta_cmd sta_cmd;
1378
1379         lockdep_assert_held(&priv->mutex);
1380
1381         sta_id = iwl_sta_id(sta);
1382         if (sta_id == IWL_INVALID_STATION)
1383                 return -ENXIO;
1384
1385         spin_lock_irqsave(&priv->sta_lock, flags);
1386         priv->stations[sta_id].sta.station_flags_msk = 0;
1387         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
1388         priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
1389         priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
1390         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1391         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1392         spin_unlock_irqrestore(&priv->sta_lock, flags);
1393
1394         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
1395 }
1396 EXPORT_SYMBOL(iwl_sta_rx_agg_start);
1397
1398 int iwl_sta_rx_agg_stop(struct iwl_priv *priv, struct ieee80211_sta *sta,
1399                         int tid)
1400 {
1401         unsigned long flags;
1402         int sta_id;
1403         struct iwl_addsta_cmd sta_cmd;
1404
1405         lockdep_assert_held(&priv->mutex);
1406
1407         sta_id = iwl_sta_id(sta);
1408         if (sta_id == IWL_INVALID_STATION) {
1409                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
1410                 return -ENXIO;
1411         }
1412
1413         spin_lock_irqsave(&priv->sta_lock, flags);
1414         priv->stations[sta_id].sta.station_flags_msk = 0;
1415         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
1416         priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
1417         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1418         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1419         spin_unlock_irqrestore(&priv->sta_lock, flags);
1420
1421         return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
1422 }
1423 EXPORT_SYMBOL(iwl_sta_rx_agg_stop);
1424
1425 void iwl_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
1426 {
1427         unsigned long flags;
1428
1429         spin_lock_irqsave(&priv->sta_lock, flags);
1430         priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
1431         priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
1432         priv->stations[sta_id].sta.sta.modify_mask = 0;
1433         priv->stations[sta_id].sta.sleep_tx_count = 0;
1434         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1435         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1436         spin_unlock_irqrestore(&priv->sta_lock, flags);
1437
1438 }
1439 EXPORT_SYMBOL(iwl_sta_modify_ps_wake);
1440
1441 void iwl_sta_modify_sleep_tx_count(struct iwl_priv *priv, int sta_id, int cnt)
1442 {
1443         unsigned long flags;
1444
1445         spin_lock_irqsave(&priv->sta_lock, flags);
1446         priv->stations[sta_id].sta.station_flags |= STA_FLG_PWR_SAVE_MSK;
1447         priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
1448         priv->stations[sta_id].sta.sta.modify_mask =
1449                                         STA_MODIFY_SLEEP_TX_COUNT_MSK;
1450         priv->stations[sta_id].sta.sleep_tx_count = cpu_to_le16(cnt);
1451         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1452         iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
1453         spin_unlock_irqrestore(&priv->sta_lock, flags);
1454
1455 }
1456 EXPORT_SYMBOL(iwl_sta_modify_sleep_tx_count);
1457
1458 int iwl_mac_sta_remove(struct ieee80211_hw *hw,
1459                        struct ieee80211_vif *vif,
1460                        struct ieee80211_sta *sta)
1461 {
1462         struct iwl_priv *priv = hw->priv;
1463         struct iwl_station_priv_common *sta_common = (void *)sta->drv_priv;
1464         int ret;
1465
1466         IWL_DEBUG_INFO(priv, "received request to remove station %pM\n",
1467                         sta->addr);
1468         mutex_lock(&priv->mutex);
1469         IWL_DEBUG_INFO(priv, "proceeding to remove station %pM\n",
1470                         sta->addr);
1471         ret = iwl_remove_station(priv, sta_common->sta_id, sta->addr);
1472         if (ret)
1473                 IWL_ERR(priv, "Error removing station %pM\n",
1474                         sta->addr);
1475         mutex_unlock(&priv->mutex);
1476         return ret;
1477 }
1478 EXPORT_SYMBOL(iwl_mac_sta_remove);