drivers/net/wireless/intel/iwlwifi/dvm/sta.c

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This source file includes following definitions.
iwl_sta_ucode_activate
iwl_process_add_sta_resp
iwl_add_sta_callback
iwl_send_add_sta
iwl_is_ht40_tx_allowed
iwl_sta_calc_ht_flags
iwl_sta_update_ht
iwl_set_ht_add_station
iwl_prep_station
iwl_add_station_common
iwl_sta_ucode_deactivate
iwl_send_remove_station
iwl_remove_station
iwl_deactivate_station
iwl_sta_fill_lq
iwl_clear_ucode_stations
iwl_restore_stations
iwl_get_free_ucode_key_offset
iwl_dealloc_bcast_stations
iwl_dump_lq_cmd
iwl_dump_lq_cmd
is_lq_table_valid
iwl_send_lq_cmd
iwl_sta_alloc_lq
iwlagn_add_bssid_station
iwl_send_static_wepkey_cmd
iwl_restore_default_wep_keys
iwl_remove_default_wep_key
iwl_set_default_wep_key
iwlagn_key_sta_id
iwlagn_send_sta_key
iwl_update_tkip_key
iwl_remove_dynamic_key
iwl_set_dynamic_key
iwlagn_alloc_bcast_station
iwl_update_bcast_station
iwl_update_bcast_stations
iwl_sta_tx_modify_enable_tid
iwl_sta_rx_agg_start
iwl_sta_rx_agg_stop
iwl_sta_modify_sleep_tx_count
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3  *
   4  * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
   5  *
   6  * Portions of this file are derived from the ipw3945 project, as well
   7  * as portions of the ieee80211 subsystem header files.
   8  *
   9  * Contact Information:
  10  *  Intel Linux Wireless <linuxwifi@intel.com>
  11  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  12  *
  13  *****************************************************************************/
  14 #include <linux/etherdevice.h>
  15 #include <net/mac80211.h>
  16 #include "iwl-trans.h"
  17 #include "dev.h"
  18 #include "agn.h"
  19 
  20 const u8 iwl_bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  21 
  22 static int iwl_sta_ucode_activate(struct iwl_priv *priv, u8 sta_id)
  23 {
  24         lockdep_assert_held(&priv->sta_lock);
  25 
  26         if (sta_id >= IWLAGN_STATION_COUNT) {
  27                 IWL_ERR(priv, "invalid sta_id %u\n", sta_id);
  28                 return -EINVAL;
  29         }
  30         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE))
  31                 IWL_ERR(priv, "ACTIVATE a non DRIVER active station id %u "
  32                         "addr %pM\n",
  33                         sta_id, priv->stations[sta_id].sta.sta.addr);
  34 
  35         if (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) {
  36                 IWL_DEBUG_ASSOC(priv,
  37                                 "STA id %u addr %pM already present in uCode "
  38                                 "(according to driver)\n",
  39                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  40         } else {
  41                 priv->stations[sta_id].used |= IWL_STA_UCODE_ACTIVE;
  42                 IWL_DEBUG_ASSOC(priv, "Added STA id %u addr %pM to uCode\n",
  43                                 sta_id, priv->stations[sta_id].sta.sta.addr);
  44         }
  45         return 0;
  46 }
  47 
  48 static void iwl_process_add_sta_resp(struct iwl_priv *priv,
  49                                      struct iwl_rx_packet *pkt)
  50 {
  51         struct iwl_add_sta_resp *add_sta_resp = (void *)pkt->data;
  52 
  53         IWL_DEBUG_INFO(priv, "Processing response for adding station\n");
  54 
  55         spin_lock_bh(&priv->sta_lock);
  56 
  57         switch (add_sta_resp->status) {
  58         case ADD_STA_SUCCESS_MSK:
  59                 IWL_DEBUG_INFO(priv, "REPLY_ADD_STA PASSED\n");
  60                 break;
  61         case ADD_STA_NO_ROOM_IN_TABLE:
  62                 IWL_ERR(priv, "Adding station failed, no room in table.\n");
  63                 break;
  64         case ADD_STA_NO_BLOCK_ACK_RESOURCE:
  65                 IWL_ERR(priv,
  66                         "Adding station failed, no block ack resource.\n");
  67                 break;
  68         case ADD_STA_MODIFY_NON_EXIST_STA:
  69                 IWL_ERR(priv, "Attempting to modify non-existing station\n");
  70                 break;
  71         default:
  72                 IWL_DEBUG_ASSOC(priv, "Received REPLY_ADD_STA:(0x%08X)\n",
  73                                 add_sta_resp->status);
  74                 break;
  75         }
  76 
  77         spin_unlock_bh(&priv->sta_lock);
  78 }
  79 
  80 void iwl_add_sta_callback(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb)
  81 {
  82         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  83 
  84         iwl_process_add_sta_resp(priv, pkt);
  85 }
  86 
  87 int iwl_send_add_sta(struct iwl_priv *priv,
  88                      struct iwl_addsta_cmd *sta, u8 flags)
  89 {
  90         int ret = 0;
  91         struct iwl_host_cmd cmd = {
  92                 .id = REPLY_ADD_STA,
  93                 .flags = flags,
  94                 .data = { sta, },
  95                 .len = { sizeof(*sta), },
  96         };
  97         u8 sta_id __maybe_unused = sta->sta.sta_id;
  98         struct iwl_rx_packet *pkt;
  99         struct iwl_add_sta_resp *add_sta_resp;
 100 
 101         IWL_DEBUG_INFO(priv, "Adding sta %u (%pM) %ssynchronously\n",
 102                        sta_id, sta->sta.addr, flags & CMD_ASYNC ?  "a" : "");
 103 
 104         if (!(flags & CMD_ASYNC)) {
 105                 cmd.flags |= CMD_WANT_SKB;
 106                 might_sleep();
 107         }
 108 
 109         ret = iwl_dvm_send_cmd(priv, &cmd);
 110 
 111         if (ret || (flags & CMD_ASYNC))
 112                 return ret;
 113 
 114         pkt = cmd.resp_pkt;
 115         add_sta_resp = (void *)pkt->data;
 116 
 117         /* debug messages are printed in the handler */
 118         if (add_sta_resp->status == ADD_STA_SUCCESS_MSK) {
 119                 spin_lock_bh(&priv->sta_lock);
 120                 ret = iwl_sta_ucode_activate(priv, sta_id);
 121                 spin_unlock_bh(&priv->sta_lock);
 122         } else {
 123                 ret = -EIO;
 124         }
 125 
 126         iwl_free_resp(&cmd);
 127 
 128         return ret;
 129 }
 130 
 131 bool iwl_is_ht40_tx_allowed(struct iwl_priv *priv,
 132                             struct iwl_rxon_context *ctx,
 133                             struct ieee80211_sta *sta)
 134 {
 135         if (!ctx->ht.enabled || !ctx->ht.is_40mhz)
 136                 return false;
 137 
 138 #ifdef CONFIG_IWLWIFI_DEBUGFS
 139         if (priv->disable_ht40)
 140                 return false;
 141 #endif
 142 
 143         /* special case for RXON */
 144         if (!sta)
 145                 return true;
 146 
 147         return sta->bandwidth >= IEEE80211_STA_RX_BW_40;
 148 }
 149 
 150 static void iwl_sta_calc_ht_flags(struct iwl_priv *priv,
 151                                   struct ieee80211_sta *sta,
 152                                   struct iwl_rxon_context *ctx,
 153                                   __le32 *flags, __le32 *mask)
 154 {
 155         struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->ht_cap;
 156 
 157         *mask = STA_FLG_RTS_MIMO_PROT_MSK |
 158                 STA_FLG_MIMO_DIS_MSK |
 159                 STA_FLG_HT40_EN_MSK |
 160                 STA_FLG_MAX_AGG_SIZE_MSK |
 161                 STA_FLG_AGG_MPDU_DENSITY_MSK;
 162         *flags = 0;
 163 
 164         if (!sta || !sta_ht_inf->ht_supported)
 165                 return;
 166 
 167         IWL_DEBUG_INFO(priv, "STA %pM SM PS mode: %s\n",
 168                         sta->addr,
 169                         (sta->smps_mode == IEEE80211_SMPS_STATIC) ?
 170                         "static" :
 171                         (sta->smps_mode == IEEE80211_SMPS_DYNAMIC) ?
 172                         "dynamic" : "disabled");
 173 
 174         switch (sta->smps_mode) {
 175         case IEEE80211_SMPS_STATIC:
 176                 *flags |= STA_FLG_MIMO_DIS_MSK;
 177                 break;
 178         case IEEE80211_SMPS_DYNAMIC:
 179                 *flags |= STA_FLG_RTS_MIMO_PROT_MSK;
 180                 break;
 181         case IEEE80211_SMPS_OFF:
 182                 break;
 183         default:
 184                 IWL_WARN(priv, "Invalid MIMO PS mode %d\n", sta->smps_mode);
 185                 break;
 186         }
 187 
 188         *flags |= cpu_to_le32(
 189                 (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 190 
 191         *flags |= cpu_to_le32(
 192                 (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 193 
 194         if (iwl_is_ht40_tx_allowed(priv, ctx, sta))
 195                 *flags |= STA_FLG_HT40_EN_MSK;
 196 }
 197 
 198 int iwl_sta_update_ht(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 199                       struct ieee80211_sta *sta)
 200 {
 201         u8 sta_id = iwl_sta_id(sta);
 202         __le32 flags, mask;
 203         struct iwl_addsta_cmd cmd;
 204 
 205         if (WARN_ON_ONCE(sta_id == IWL_INVALID_STATION))
 206                 return -EINVAL;
 207 
 208         iwl_sta_calc_ht_flags(priv, sta, ctx, &flags, &mask);
 209 
 210         spin_lock_bh(&priv->sta_lock);
 211         priv->stations[sta_id].sta.station_flags &= ~mask;
 212         priv->stations[sta_id].sta.station_flags |= flags;
 213         spin_unlock_bh(&priv->sta_lock);
 214 
 215         memset(&cmd, 0, sizeof(cmd));
 216         cmd.mode = STA_CONTROL_MODIFY_MSK;
 217         cmd.station_flags_msk = mask;
 218         cmd.station_flags = flags;
 219         cmd.sta.sta_id = sta_id;
 220 
 221         return iwl_send_add_sta(priv, &cmd, 0);
 222 }
 223 
 224 static void iwl_set_ht_add_station(struct iwl_priv *priv, u8 index,
 225                                    struct ieee80211_sta *sta,
 226                                    struct iwl_rxon_context *ctx)
 227 {
 228         __le32 flags, mask;
 229 
 230         iwl_sta_calc_ht_flags(priv, sta, ctx, &flags, &mask);
 231 
 232         lockdep_assert_held(&priv->sta_lock);
 233         priv->stations[index].sta.station_flags &= ~mask;
 234         priv->stations[index].sta.station_flags |= flags;
 235 }
 236 
 237 /**
 238  * iwl_prep_station - Prepare station information for addition
 239  *
 240  * should be called with sta_lock held
 241  */
 242 u8 iwl_prep_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 243                     const u8 *addr, bool is_ap, struct ieee80211_sta *sta)
 244 {
 245         struct iwl_station_entry *station;
 246         int i;
 247         u8 sta_id = IWL_INVALID_STATION;
 248 
 249         if (is_ap)
 250                 sta_id = ctx->ap_sta_id;
 251         else if (is_broadcast_ether_addr(addr))
 252                 sta_id = ctx->bcast_sta_id;
 253         else
 254                 for (i = IWL_STA_ID; i < IWLAGN_STATION_COUNT; i++) {
 255                         if (ether_addr_equal(priv->stations[i].sta.sta.addr,
 256                                              addr)) {
 257                                 sta_id = i;
 258                                 break;
 259                         }
 260 
 261                         if (!priv->stations[i].used &&
 262                             sta_id == IWL_INVALID_STATION)
 263                                 sta_id = i;
 264                 }
 265 
 266         /*
 267          * These two conditions have the same outcome, but keep them
 268          * separate
 269          */
 270         if (unlikely(sta_id == IWL_INVALID_STATION))
 271                 return sta_id;
 272 
 273         /*
 274          * uCode is not able to deal with multiple requests to add a
 275          * station. Keep track if one is in progress so that we do not send
 276          * another.
 277          */
 278         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 279                 IWL_DEBUG_INFO(priv, "STA %d already in process of being "
 280                                "added.\n", sta_id);
 281                 return sta_id;
 282         }
 283 
 284         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 285             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE) &&
 286             ether_addr_equal(priv->stations[sta_id].sta.sta.addr, addr)) {
 287                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not "
 288                                 "adding again.\n", sta_id, addr);
 289                 return sta_id;
 290         }
 291 
 292         station = &priv->stations[sta_id];
 293         station->used = IWL_STA_DRIVER_ACTIVE;
 294         IWL_DEBUG_ASSOC(priv, "Add STA to driver ID %d: %pM\n",
 295                         sta_id, addr);
 296         priv->num_stations++;
 297 
 298         /* Set up the REPLY_ADD_STA command to send to device */
 299         memset(&station->sta, 0, sizeof(struct iwl_addsta_cmd));
 300         memcpy(station->sta.sta.addr, addr, ETH_ALEN);
 301         station->sta.mode = 0;
 302         station->sta.sta.sta_id = sta_id;
 303         station->sta.station_flags = ctx->station_flags;
 304         station->ctxid = ctx->ctxid;
 305 
 306         if (sta) {
 307                 struct iwl_station_priv *sta_priv;
 308 
 309                 sta_priv = (void *)sta->drv_priv;
 310                 sta_priv->ctx = ctx;
 311         }
 312 
 313         /*
 314          * OK to call unconditionally, since local stations (IBSS BSSID
 315          * STA and broadcast STA) pass in a NULL sta, and mac80211
 316          * doesn't allow HT IBSS.
 317          */
 318         iwl_set_ht_add_station(priv, sta_id, sta, ctx);
 319 
 320         return sta_id;
 321 
 322 }
 323 
 324 #define STA_WAIT_TIMEOUT (HZ/2)
 325 
 326 /**
 327  * iwl_add_station_common -
 328  */
 329 int iwl_add_station_common(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 330                            const u8 *addr, bool is_ap,
 331                            struct ieee80211_sta *sta, u8 *sta_id_r)
 332 {
 333         int ret = 0;
 334         u8 sta_id;
 335         struct iwl_addsta_cmd sta_cmd;
 336 
 337         *sta_id_r = 0;
 338         spin_lock_bh(&priv->sta_lock);
 339         sta_id = iwl_prep_station(priv, ctx, addr, is_ap, sta);
 340         if (sta_id == IWL_INVALID_STATION) {
 341                 IWL_ERR(priv, "Unable to prepare station %pM for addition\n",
 342                         addr);
 343                 spin_unlock_bh(&priv->sta_lock);
 344                 return -EINVAL;
 345         }
 346 
 347         /*
 348          * uCode is not able to deal with multiple requests to add a
 349          * station. Keep track if one is in progress so that we do not send
 350          * another.
 351          */
 352         if (priv->stations[sta_id].used & IWL_STA_UCODE_INPROGRESS) {
 353                 IWL_DEBUG_INFO(priv, "STA %d already in process of being "
 354                                "added.\n", sta_id);
 355                 spin_unlock_bh(&priv->sta_lock);
 356                 return -EEXIST;
 357         }
 358 
 359         if ((priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE) &&
 360             (priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 361                 IWL_DEBUG_ASSOC(priv, "STA %d (%pM) already added, not "
 362                                 "adding again.\n", sta_id, addr);
 363                 spin_unlock_bh(&priv->sta_lock);
 364                 return -EEXIST;
 365         }
 366 
 367         priv->stations[sta_id].used |= IWL_STA_UCODE_INPROGRESS;
 368         memcpy(&sta_cmd, &priv->stations[sta_id].sta,
 369                sizeof(struct iwl_addsta_cmd));
 370         spin_unlock_bh(&priv->sta_lock);
 371 
 372         /* Add station to device's station table */
 373         ret = iwl_send_add_sta(priv, &sta_cmd, 0);
 374         if (ret) {
 375                 spin_lock_bh(&priv->sta_lock);
 376                 IWL_ERR(priv, "Adding station %pM failed.\n",
 377                         priv->stations[sta_id].sta.sta.addr);
 378                 priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 379                 priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 380                 spin_unlock_bh(&priv->sta_lock);
 381         }
 382         *sta_id_r = sta_id;
 383         return ret;
 384 }
 385 
 386 /**
 387  * iwl_sta_ucode_deactivate - deactivate ucode status for a station
 388  */
 389 static void iwl_sta_ucode_deactivate(struct iwl_priv *priv, u8 sta_id)
 390 {
 391         lockdep_assert_held(&priv->sta_lock);
 392 
 393         /* Ucode must be active and driver must be non active */
 394         if ((priv->stations[sta_id].used &
 395              (IWL_STA_UCODE_ACTIVE | IWL_STA_DRIVER_ACTIVE)) !=
 396               IWL_STA_UCODE_ACTIVE)
 397                 IWL_ERR(priv, "removed non active STA %u\n", sta_id);
 398 
 399         priv->stations[sta_id].used &= ~IWL_STA_UCODE_ACTIVE;
 400 
 401         memset(&priv->stations[sta_id], 0, sizeof(struct iwl_station_entry));
 402         IWL_DEBUG_ASSOC(priv, "Removed STA %u\n", sta_id);
 403 }
 404 
 405 static int iwl_send_remove_station(struct iwl_priv *priv,
 406                                    const u8 *addr, int sta_id,
 407                                    bool temporary)
 408 {
 409         struct iwl_rx_packet *pkt;
 410         int ret;
 411         struct iwl_rem_sta_cmd rm_sta_cmd;
 412         struct iwl_rem_sta_resp *rem_sta_resp;
 413 
 414         struct iwl_host_cmd cmd = {
 415                 .id = REPLY_REMOVE_STA,
 416                 .len = { sizeof(struct iwl_rem_sta_cmd), },
 417                 .data = { &rm_sta_cmd, },
 418         };
 419 
 420         memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
 421         rm_sta_cmd.num_sta = 1;
 422         memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 423 
 424         cmd.flags |= CMD_WANT_SKB;
 425 
 426         ret = iwl_dvm_send_cmd(priv, &cmd);
 427 
 428         if (ret)
 429                 return ret;
 430 
 431         pkt = cmd.resp_pkt;
 432         rem_sta_resp = (void *)pkt->data;
 433 
 434         switch (rem_sta_resp->status) {
 435         case REM_STA_SUCCESS_MSK:
 436                 if (!temporary) {
 437                         spin_lock_bh(&priv->sta_lock);
 438                         iwl_sta_ucode_deactivate(priv, sta_id);
 439                         spin_unlock_bh(&priv->sta_lock);
 440                 }
 441                 IWL_DEBUG_ASSOC(priv, "REPLY_REMOVE_STA PASSED\n");
 442                 break;
 443         default:
 444                 ret = -EIO;
 445                 IWL_ERR(priv, "REPLY_REMOVE_STA failed\n");
 446                 break;
 447         }
 448 
 449         iwl_free_resp(&cmd);
 450 
 451         return ret;
 452 }
 453 
 454 /**
 455  * iwl_remove_station - Remove driver's knowledge of station.
 456  */
 457 int iwl_remove_station(struct iwl_priv *priv, const u8 sta_id,
 458                        const u8 *addr)
 459 {
 460         u8 tid;
 461 
 462         if (!iwl_is_ready(priv)) {
 463                 IWL_DEBUG_INFO(priv,
 464                         "Unable to remove station %pM, device not ready.\n",
 465                         addr);
 466                 /*
 467                  * It is typical for stations to be removed when we are
 468                  * going down. Return success since device will be down
 469                  * soon anyway
 470                  */
 471                 return 0;
 472         }
 473 
 474         IWL_DEBUG_ASSOC(priv, "Removing STA from driver:%d  %pM\n",
 475                         sta_id, addr);
 476 
 477         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 478                 return -EINVAL;
 479 
 480         spin_lock_bh(&priv->sta_lock);
 481 
 482         if (!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 483                 IWL_DEBUG_INFO(priv, "Removing %pM but non DRIVER active\n",
 484                                 addr);
 485                 goto out_err;
 486         }
 487 
 488         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE)) {
 489                 IWL_DEBUG_INFO(priv, "Removing %pM but non UCODE active\n",
 490                                 addr);
 491                 goto out_err;
 492         }
 493 
 494         if (priv->stations[sta_id].used & IWL_STA_LOCAL) {
 495                 kfree(priv->stations[sta_id].lq);
 496                 priv->stations[sta_id].lq = NULL;
 497         }
 498 
 499         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
 500                 memset(&priv->tid_data[sta_id][tid], 0,
 501                         sizeof(priv->tid_data[sta_id][tid]));
 502 
 503         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 504 
 505         priv->num_stations--;
 506 
 507         if (WARN_ON(priv->num_stations < 0))
 508                 priv->num_stations = 0;
 509 
 510         spin_unlock_bh(&priv->sta_lock);
 511 
 512         return iwl_send_remove_station(priv, addr, sta_id, false);
 513 out_err:
 514         spin_unlock_bh(&priv->sta_lock);
 515         return -EINVAL;
 516 }
 517 
 518 void iwl_deactivate_station(struct iwl_priv *priv, const u8 sta_id,
 519                             const u8 *addr)
 520 {
 521         u8 tid;
 522 
 523         if (!iwl_is_ready(priv)) {
 524                 IWL_DEBUG_INFO(priv,
 525                         "Unable to remove station %pM, device not ready.\n",
 526                         addr);
 527                 return;
 528         }
 529 
 530         IWL_DEBUG_ASSOC(priv, "Deactivating STA: %pM (%d)\n", addr, sta_id);
 531 
 532         if (WARN_ON_ONCE(sta_id == IWL_INVALID_STATION))
 533                 return;
 534 
 535         spin_lock_bh(&priv->sta_lock);
 536 
 537         WARN_ON_ONCE(!(priv->stations[sta_id].used & IWL_STA_DRIVER_ACTIVE));
 538 
 539         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
 540                 memset(&priv->tid_data[sta_id][tid], 0,
 541                         sizeof(priv->tid_data[sta_id][tid]));
 542 
 543         priv->stations[sta_id].used &= ~IWL_STA_DRIVER_ACTIVE;
 544         priv->stations[sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 545 
 546         priv->num_stations--;
 547 
 548         if (WARN_ON_ONCE(priv->num_stations < 0))
 549                 priv->num_stations = 0;
 550 
 551         spin_unlock_bh(&priv->sta_lock);
 552 }
 553 
 554 static void iwl_sta_fill_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 555                             u8 sta_id, struct iwl_link_quality_cmd *link_cmd)
 556 {
 557         int i, r;
 558         u32 rate_flags = 0;
 559         __le32 rate_n_flags;
 560 
 561         lockdep_assert_held(&priv->mutex);
 562 
 563         memset(link_cmd, 0, sizeof(*link_cmd));
 564 
 565         /* Set up the rate scaling to start at selected rate, fall back
 566          * all the way down to 1M in IEEE order, and then spin on 1M */
 567         if (priv->band == NL80211_BAND_5GHZ)
 568                 r = IWL_RATE_6M_INDEX;
 569         else if (ctx && ctx->vif && ctx->vif->p2p)
 570                 r = IWL_RATE_6M_INDEX;
 571         else
 572                 r = IWL_RATE_1M_INDEX;
 573 
 574         if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
 575                 rate_flags |= RATE_MCS_CCK_MSK;
 576 
 577         rate_flags |= first_antenna(priv->nvm_data->valid_tx_ant) <<
 578                                 RATE_MCS_ANT_POS;
 579         rate_n_flags = iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
 580         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 581                 link_cmd->rs_table[i].rate_n_flags = rate_n_flags;
 582 
 583         link_cmd->general_params.single_stream_ant_msk =
 584                         first_antenna(priv->nvm_data->valid_tx_ant);
 585 
 586         link_cmd->general_params.dual_stream_ant_msk =
 587                 priv->nvm_data->valid_tx_ant &
 588                 ~first_antenna(priv->nvm_data->valid_tx_ant);
 589         if (!link_cmd->general_params.dual_stream_ant_msk) {
 590                 link_cmd->general_params.dual_stream_ant_msk = ANT_AB;
 591         } else if (num_of_ant(priv->nvm_data->valid_tx_ant) == 2) {
 592                 link_cmd->general_params.dual_stream_ant_msk =
 593                         priv->nvm_data->valid_tx_ant;
 594         }
 595 
 596         link_cmd->agg_params.agg_dis_start_th =
 597                 LINK_QUAL_AGG_DISABLE_START_DEF;
 598         link_cmd->agg_params.agg_time_limit =
 599                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
 600 
 601         link_cmd->sta_id = sta_id;
 602 }
 603 
 604 /**
 605  * iwl_clear_ucode_stations - clear ucode station table bits
 606  *
 607  * This function clears all the bits in the driver indicating
 608  * which stations are active in the ucode. Call when something
 609  * other than explicit station management would cause this in
 610  * the ucode, e.g. unassociated RXON.
 611  */
 612 void iwl_clear_ucode_stations(struct iwl_priv *priv,
 613                               struct iwl_rxon_context *ctx)
 614 {
 615         int i;
 616         bool cleared = false;
 617 
 618         IWL_DEBUG_INFO(priv, "Clearing ucode stations in driver\n");
 619 
 620         spin_lock_bh(&priv->sta_lock);
 621         for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
 622                 if (ctx && ctx->ctxid != priv->stations[i].ctxid)
 623                         continue;
 624 
 625                 if (priv->stations[i].used & IWL_STA_UCODE_ACTIVE) {
 626                         IWL_DEBUG_INFO(priv,
 627                                 "Clearing ucode active for station %d\n", i);
 628                         priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 629                         cleared = true;
 630                 }
 631         }
 632         spin_unlock_bh(&priv->sta_lock);
 633 
 634         if (!cleared)
 635                 IWL_DEBUG_INFO(priv,
 636                                "No active stations found to be cleared\n");
 637 }
 638 
 639 /**
 640  * iwl_restore_stations() - Restore driver known stations to device
 641  *
 642  * All stations considered active by driver, but not present in ucode, is
 643  * restored.
 644  *
 645  * Function sleeps.
 646  */
 647 void iwl_restore_stations(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 648 {
 649         struct iwl_addsta_cmd sta_cmd;
 650         static const struct iwl_link_quality_cmd zero_lq = {};
 651         struct iwl_link_quality_cmd lq;
 652         int i;
 653         bool found = false;
 654         int ret;
 655         bool send_lq;
 656 
 657         if (!iwl_is_ready(priv)) {
 658                 IWL_DEBUG_INFO(priv,
 659                                "Not ready yet, not restoring any stations.\n");
 660                 return;
 661         }
 662 
 663         IWL_DEBUG_ASSOC(priv, "Restoring all known stations ... start.\n");
 664         spin_lock_bh(&priv->sta_lock);
 665         for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
 666                 if (ctx->ctxid != priv->stations[i].ctxid)
 667                         continue;
 668                 if ((priv->stations[i].used & IWL_STA_DRIVER_ACTIVE) &&
 669                             !(priv->stations[i].used & IWL_STA_UCODE_ACTIVE)) {
 670                         IWL_DEBUG_ASSOC(priv, "Restoring sta %pM\n",
 671                                         priv->stations[i].sta.sta.addr);
 672                         priv->stations[i].sta.mode = 0;
 673                         priv->stations[i].used |= IWL_STA_UCODE_INPROGRESS;
 674                         found = true;
 675                 }
 676         }
 677 
 678         for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
 679                 if ((priv->stations[i].used & IWL_STA_UCODE_INPROGRESS)) {
 680                         memcpy(&sta_cmd, &priv->stations[i].sta,
 681                                sizeof(struct iwl_addsta_cmd));
 682                         send_lq = false;
 683                         if (priv->stations[i].lq) {
 684                                 if (priv->wowlan)
 685                                         iwl_sta_fill_lq(priv, ctx, i, &lq);
 686                                 else
 687                                         memcpy(&lq, priv->stations[i].lq,
 688                                                sizeof(struct iwl_link_quality_cmd));
 689 
 690                                 if (memcmp(&lq, &zero_lq, sizeof(lq)))
 691                                         send_lq = true;
 692                         }
 693                         spin_unlock_bh(&priv->sta_lock);
 694                         ret = iwl_send_add_sta(priv, &sta_cmd, 0);
 695                         if (ret) {
 696                                 spin_lock_bh(&priv->sta_lock);
 697                                 IWL_ERR(priv, "Adding station %pM failed.\n",
 698                                         priv->stations[i].sta.sta.addr);
 699                                 priv->stations[i].used &=
 700                                                 ~IWL_STA_DRIVER_ACTIVE;
 701                                 priv->stations[i].used &=
 702                                                 ~IWL_STA_UCODE_INPROGRESS;
 703                                 continue;
 704                         }
 705                         /*
 706                          * Rate scaling has already been initialized, send
 707                          * current LQ command
 708                          */
 709                         if (send_lq)
 710                                 iwl_send_lq_cmd(priv, ctx, &lq, 0, true);
 711                         spin_lock_bh(&priv->sta_lock);
 712                         priv->stations[i].used &= ~IWL_STA_UCODE_INPROGRESS;
 713                 }
 714         }
 715 
 716         spin_unlock_bh(&priv->sta_lock);
 717         if (!found)
 718                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... "
 719                         "no stations to be restored.\n");
 720         else
 721                 IWL_DEBUG_INFO(priv, "Restoring all known stations .... "
 722                         "complete.\n");
 723 }
 724 
 725 int iwl_get_free_ucode_key_offset(struct iwl_priv *priv)
 726 {
 727         int i;
 728 
 729         for (i = 0; i < priv->sta_key_max_num; i++)
 730                 if (!test_and_set_bit(i, &priv->ucode_key_table))
 731                         return i;
 732 
 733         return WEP_INVALID_OFFSET;
 734 }
 735 
 736 void iwl_dealloc_bcast_stations(struct iwl_priv *priv)
 737 {
 738         int i;
 739 
 740         spin_lock_bh(&priv->sta_lock);
 741         for (i = 0; i < IWLAGN_STATION_COUNT; i++) {
 742                 if (!(priv->stations[i].used & IWL_STA_BCAST))
 743                         continue;
 744 
 745                 priv->stations[i].used &= ~IWL_STA_UCODE_ACTIVE;
 746                 priv->num_stations--;
 747                 if (WARN_ON(priv->num_stations < 0))
 748                         priv->num_stations = 0;
 749                 kfree(priv->stations[i].lq);
 750                 priv->stations[i].lq = NULL;
 751         }
 752         spin_unlock_bh(&priv->sta_lock);
 753 }
 754 
 755 #ifdef CONFIG_IWLWIFI_DEBUG
 756 static void iwl_dump_lq_cmd(struct iwl_priv *priv,
 757                            struct iwl_link_quality_cmd *lq)
 758 {
 759         int i;
 760         IWL_DEBUG_RATE(priv, "lq station id 0x%x\n", lq->sta_id);
 761         IWL_DEBUG_RATE(priv, "lq ant 0x%X 0x%X\n",
 762                        lq->general_params.single_stream_ant_msk,
 763                        lq->general_params.dual_stream_ant_msk);
 764 
 765         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
 766                 IWL_DEBUG_RATE(priv, "lq index %d 0x%X\n",
 767                                i, lq->rs_table[i].rate_n_flags);
 768 }
 769 #else
 770 static inline void iwl_dump_lq_cmd(struct iwl_priv *priv,
 771                                    struct iwl_link_quality_cmd *lq)
 772 {
 773 }
 774 #endif
 775 
 776 /**
 777  * is_lq_table_valid() - Test one aspect of LQ cmd for validity
 778  *
 779  * It sometimes happens when a HT rate has been in use and we
 780  * loose connectivity with AP then mac80211 will first tell us that the
 781  * current channel is not HT anymore before removing the station. In such a
 782  * scenario the RXON flags will be updated to indicate we are not
 783  * communicating HT anymore, but the LQ command may still contain HT rates.
 784  * Test for this to prevent driver from sending LQ command between the time
 785  * RXON flags are updated and when LQ command is updated.
 786  */
 787 static bool is_lq_table_valid(struct iwl_priv *priv,
 788                               struct iwl_rxon_context *ctx,
 789                               struct iwl_link_quality_cmd *lq)
 790 {
 791         int i;
 792 
 793         if (ctx->ht.enabled)
 794                 return true;
 795 
 796         IWL_DEBUG_INFO(priv, "Channel %u is not an HT channel\n",
 797                        ctx->active.channel);
 798         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
 799                 if (le32_to_cpu(lq->rs_table[i].rate_n_flags) &
 800                     RATE_MCS_HT_MSK) {
 801                         IWL_DEBUG_INFO(priv,
 802                                        "index %d of LQ expects HT channel\n",
 803                                        i);
 804                         return false;
 805                 }
 806         }
 807         return true;
 808 }
 809 
 810 /**
 811  * iwl_send_lq_cmd() - Send link quality command
 812  * @init: This command is sent as part of station initialization right
 813  *        after station has been added.
 814  *
 815  * The link quality command is sent as the last step of station creation.
 816  * This is the special case in which init is set and we call a callback in
 817  * this case to clear the state indicating that station creation is in
 818  * progress.
 819  */
 820 int iwl_send_lq_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 821                     struct iwl_link_quality_cmd *lq, u8 flags, bool init)
 822 {
 823         int ret = 0;
 824         struct iwl_host_cmd cmd = {
 825                 .id = REPLY_TX_LINK_QUALITY_CMD,
 826                 .len = { sizeof(struct iwl_link_quality_cmd), },
 827                 .flags = flags,
 828                 .data = { lq, },
 829         };
 830 
 831         if (WARN_ON(lq->sta_id == IWL_INVALID_STATION))
 832                 return -EINVAL;
 833 
 834 
 835         spin_lock_bh(&priv->sta_lock);
 836         if (!(priv->stations[lq->sta_id].used & IWL_STA_DRIVER_ACTIVE)) {
 837                 spin_unlock_bh(&priv->sta_lock);
 838                 return -EINVAL;
 839         }
 840         spin_unlock_bh(&priv->sta_lock);
 841 
 842         iwl_dump_lq_cmd(priv, lq);
 843         if (WARN_ON(init && (cmd.flags & CMD_ASYNC)))
 844                 return -EINVAL;
 845 
 846         if (is_lq_table_valid(priv, ctx, lq))
 847                 ret = iwl_dvm_send_cmd(priv, &cmd);
 848         else
 849                 ret = -EINVAL;
 850 
 851         if (cmd.flags & CMD_ASYNC)
 852                 return ret;
 853 
 854         if (init) {
 855                 IWL_DEBUG_INFO(priv, "init LQ command complete, "
 856                                "clearing sta addition status for sta %d\n",
 857                                lq->sta_id);
 858                 spin_lock_bh(&priv->sta_lock);
 859                 priv->stations[lq->sta_id].used &= ~IWL_STA_UCODE_INPROGRESS;
 860                 spin_unlock_bh(&priv->sta_lock);
 861         }
 862         return ret;
 863 }
 864 
 865 
 866 static struct iwl_link_quality_cmd *
 867 iwl_sta_alloc_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 868                  u8 sta_id)
 869 {
 870         struct iwl_link_quality_cmd *link_cmd;
 871 
 872         link_cmd = kzalloc(sizeof(struct iwl_link_quality_cmd), GFP_KERNEL);
 873         if (!link_cmd) {
 874                 IWL_ERR(priv, "Unable to allocate memory for LQ cmd.\n");
 875                 return NULL;
 876         }
 877 
 878         iwl_sta_fill_lq(priv, ctx, sta_id, link_cmd);
 879 
 880         return link_cmd;
 881 }
 882 
 883 /*
 884  * iwlagn_add_bssid_station - Add the special IBSS BSSID station
 885  *
 886  * Function sleeps.
 887  */
 888 int iwlagn_add_bssid_station(struct iwl_priv *priv,
 889                              struct iwl_rxon_context *ctx,
 890                              const u8 *addr, u8 *sta_id_r)
 891 {
 892         int ret;
 893         u8 sta_id;
 894         struct iwl_link_quality_cmd *link_cmd;
 895 
 896         if (sta_id_r)
 897                 *sta_id_r = IWL_INVALID_STATION;
 898 
 899         ret = iwl_add_station_common(priv, ctx, addr, 0, NULL, &sta_id);
 900         if (ret) {
 901                 IWL_ERR(priv, "Unable to add station %pM\n", addr);
 902                 return ret;
 903         }
 904 
 905         if (sta_id_r)
 906                 *sta_id_r = sta_id;
 907 
 908         spin_lock_bh(&priv->sta_lock);
 909         priv->stations[sta_id].used |= IWL_STA_LOCAL;
 910         spin_unlock_bh(&priv->sta_lock);
 911 
 912         /* Set up default rate scaling table in device's station table */
 913         link_cmd = iwl_sta_alloc_lq(priv, ctx, sta_id);
 914         if (!link_cmd) {
 915                 IWL_ERR(priv,
 916                         "Unable to initialize rate scaling for station %pM.\n",
 917                         addr);
 918                 return -ENOMEM;
 919         }
 920 
 921         ret = iwl_send_lq_cmd(priv, ctx, link_cmd, 0, true);
 922         if (ret)
 923                 IWL_ERR(priv, "Link quality command failed (%d)\n", ret);
 924 
 925         spin_lock_bh(&priv->sta_lock);
 926         priv->stations[sta_id].lq = link_cmd;
 927         spin_unlock_bh(&priv->sta_lock);
 928 
 929         return 0;
 930 }
 931 
 932 /*
 933  * static WEP keys
 934  *
 935  * For each context, the device has a table of 4 static WEP keys
 936  * (one for each key index) that is updated with the following
 937  * commands.
 938  */
 939 
 940 static int iwl_send_static_wepkey_cmd(struct iwl_priv *priv,
 941                                       struct iwl_rxon_context *ctx,
 942                                       bool send_if_empty)
 943 {
 944         int i, not_empty = 0;
 945         u8 buff[sizeof(struct iwl_wep_cmd) +
 946                 sizeof(struct iwl_wep_key) * WEP_KEYS_MAX];
 947         struct iwl_wep_cmd *wep_cmd = (struct iwl_wep_cmd *)buff;
 948         size_t cmd_size  = sizeof(struct iwl_wep_cmd);
 949         struct iwl_host_cmd cmd = {
 950                 .id = ctx->wep_key_cmd,
 951                 .data = { wep_cmd, },
 952         };
 953 
 954         might_sleep();
 955 
 956         memset(wep_cmd, 0, cmd_size +
 957                         (sizeof(struct iwl_wep_key) * WEP_KEYS_MAX));
 958 
 959         for (i = 0; i < WEP_KEYS_MAX ; i++) {
 960                 wep_cmd->key[i].key_index = i;
 961                 if (ctx->wep_keys[i].key_size) {
 962                         wep_cmd->key[i].key_offset = i;
 963                         not_empty = 1;
 964                 } else {
 965                         wep_cmd->key[i].key_offset = WEP_INVALID_OFFSET;
 966                 }
 967 
 968                 wep_cmd->key[i].key_size = ctx->wep_keys[i].key_size;
 969                 memcpy(&wep_cmd->key[i].key[3], ctx->wep_keys[i].key,
 970                                 ctx->wep_keys[i].key_size);
 971         }
 972 
 973         wep_cmd->global_key_type = WEP_KEY_WEP_TYPE;
 974         wep_cmd->num_keys = WEP_KEYS_MAX;
 975 
 976         cmd_size += sizeof(struct iwl_wep_key) * WEP_KEYS_MAX;
 977 
 978         cmd.len[0] = cmd_size;
 979 
 980         if (not_empty || send_if_empty)
 981                 return iwl_dvm_send_cmd(priv, &cmd);
 982         else
 983                 return 0;
 984 }
 985 
 986 int iwl_restore_default_wep_keys(struct iwl_priv *priv,
 987                                  struct iwl_rxon_context *ctx)
 988 {
 989         lockdep_assert_held(&priv->mutex);
 990 
 991         return iwl_send_static_wepkey_cmd(priv, ctx, false);
 992 }
 993 
 994 int iwl_remove_default_wep_key(struct iwl_priv *priv,
 995                                struct iwl_rxon_context *ctx,
 996                                struct ieee80211_key_conf *keyconf)
 997 {
 998         int ret;
 999 
1000         lockdep_assert_held(&priv->mutex);
1001 
1002         IWL_DEBUG_WEP(priv, "Removing default WEP key: idx=%d\n",
1003                       keyconf->keyidx);
1004 
1005         memset(&ctx->wep_keys[keyconf->keyidx], 0, sizeof(ctx->wep_keys[0]));
1006         if (iwl_is_rfkill(priv)) {
1007                 IWL_DEBUG_WEP(priv,
1008                         "Not sending REPLY_WEPKEY command due to RFKILL.\n");
1009                 /* but keys in device are clear anyway so return success */
1010                 return 0;
1011         }
1012         ret = iwl_send_static_wepkey_cmd(priv, ctx, 1);
1013         IWL_DEBUG_WEP(priv, "Remove default WEP key: idx=%d ret=%d\n",
1014                       keyconf->keyidx, ret);
1015 
1016         return ret;
1017 }
1018 
1019 int iwl_set_default_wep_key(struct iwl_priv *priv,
1020                             struct iwl_rxon_context *ctx,
1021                             struct ieee80211_key_conf *keyconf)
1022 {
1023         int ret;
1024 
1025         lockdep_assert_held(&priv->mutex);
1026 
1027         if (keyconf->keylen != WEP_KEY_LEN_128 &&
1028             keyconf->keylen != WEP_KEY_LEN_64) {
1029                 IWL_DEBUG_WEP(priv,
1030                               "Bad WEP key length %d\n", keyconf->keylen);
1031                 return -EINVAL;
1032         }
1033 
1034         keyconf->hw_key_idx = IWLAGN_HW_KEY_DEFAULT;
1035 
1036         ctx->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
1037         memcpy(&ctx->wep_keys[keyconf->keyidx].key, &keyconf->key,
1038                                                         keyconf->keylen);
1039 
1040         ret = iwl_send_static_wepkey_cmd(priv, ctx, false);
1041         IWL_DEBUG_WEP(priv, "Set default WEP key: len=%d idx=%d ret=%d\n",
1042                 keyconf->keylen, keyconf->keyidx, ret);
1043 
1044         return ret;
1045 }
1046 
1047 /*
1048  * dynamic (per-station) keys
1049  *
1050  * The dynamic keys are a little more complicated. The device has
1051  * a key cache of up to STA_KEY_MAX_NUM/STA_KEY_MAX_NUM_PAN keys.
1052  * These are linked to stations by a table that contains an index
1053  * into the key table for each station/key index/{mcast,unicast},
1054  * i.e. it's basically an array of pointers like this:
1055  *      key_offset_t key_mapping[NUM_STATIONS][4][2];
1056  * (it really works differently, but you can think of it as such)
1057  *
1058  * The key uploading and linking happens in the same command, the
1059  * add station command with STA_MODIFY_KEY_MASK.
1060  */
1061 
1062 static u8 iwlagn_key_sta_id(struct iwl_priv *priv,
1063                             struct ieee80211_vif *vif,
1064                             struct ieee80211_sta *sta)
1065 {
1066         struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
1067 
1068         if (sta)
1069                 return iwl_sta_id(sta);
1070 
1071         /*
1072          * The device expects GTKs for station interfaces to be
1073          * installed as GTKs for the AP station. If we have no
1074          * station ID, then use the ap_sta_id in that case.
1075          */
1076         if (vif->type == NL80211_IFTYPE_STATION && vif_priv->ctx)
1077                 return vif_priv->ctx->ap_sta_id;
1078 
1079         return IWL_INVALID_STATION;
1080 }
1081 
1082 static int iwlagn_send_sta_key(struct iwl_priv *priv,
1083                                struct ieee80211_key_conf *keyconf,
1084                                u8 sta_id, u32 tkip_iv32, u16 *tkip_p1k,
1085                                u32 cmd_flags)
1086 {
1087         __le16 key_flags;
1088         struct iwl_addsta_cmd sta_cmd;
1089         int i;
1090 
1091         spin_lock_bh(&priv->sta_lock);
1092         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
1093         spin_unlock_bh(&priv->sta_lock);
1094 
1095         key_flags = cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
1096         key_flags |= STA_KEY_FLG_MAP_KEY_MSK;
1097 
1098         switch (keyconf->cipher) {
1099         case WLAN_CIPHER_SUITE_CCMP:
1100                 key_flags |= STA_KEY_FLG_CCMP;
1101                 memcpy(sta_cmd.key.key, keyconf->key, keyconf->keylen);
1102                 break;
1103         case WLAN_CIPHER_SUITE_TKIP:
1104                 key_flags |= STA_KEY_FLG_TKIP;
1105                 sta_cmd.key.tkip_rx_tsc_byte2 = tkip_iv32;
1106                 for (i = 0; i < 5; i++)
1107                         sta_cmd.key.tkip_rx_ttak[i] = cpu_to_le16(tkip_p1k[i]);
1108                 memcpy(sta_cmd.key.key, keyconf->key, keyconf->keylen);
1109                 break;
1110         case WLAN_CIPHER_SUITE_WEP104:
1111                 key_flags |= STA_KEY_FLG_KEY_SIZE_MSK;
1112                 /* fall through */
1113         case WLAN_CIPHER_SUITE_WEP40:
1114                 key_flags |= STA_KEY_FLG_WEP;
1115                 memcpy(&sta_cmd.key.key[3], keyconf->key, keyconf->keylen);
1116                 break;
1117         default:
1118                 WARN_ON(1);
1119                 return -EINVAL;
1120         }
1121 
1122         if (!(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE))
1123                 key_flags |= STA_KEY_MULTICAST_MSK;
1124 
1125         /* key pointer (offset) */
1126         sta_cmd.key.key_offset = keyconf->hw_key_idx;
1127 
1128         sta_cmd.key.key_flags = key_flags;
1129         sta_cmd.mode = STA_CONTROL_MODIFY_MSK;
1130         sta_cmd.sta.modify_mask = STA_MODIFY_KEY_MASK;
1131 
1132         return iwl_send_add_sta(priv, &sta_cmd, cmd_flags);
1133 }
1134 
1135 void iwl_update_tkip_key(struct iwl_priv *priv,
1136                          struct ieee80211_vif *vif,
1137                          struct ieee80211_key_conf *keyconf,
1138                          struct ieee80211_sta *sta, u32 iv32, u16 *phase1key)
1139 {
1140         u8 sta_id = iwlagn_key_sta_id(priv, vif, sta);
1141 
1142         if (sta_id == IWL_INVALID_STATION)
1143                 return;
1144 
1145         if (iwl_scan_cancel(priv)) {
1146                 /* cancel scan failed, just live w/ bad key and rely
1147                    briefly on SW decryption */
1148                 return;
1149         }
1150 
1151         iwlagn_send_sta_key(priv, keyconf, sta_id,
1152                             iv32, phase1key, CMD_ASYNC);
1153 }
1154 
1155 int iwl_remove_dynamic_key(struct iwl_priv *priv,
1156                            struct iwl_rxon_context *ctx,
1157                            struct ieee80211_key_conf *keyconf,
1158                            struct ieee80211_sta *sta)
1159 {
1160         struct iwl_addsta_cmd sta_cmd;
1161         u8 sta_id = iwlagn_key_sta_id(priv, ctx->vif, sta);
1162         __le16 key_flags;
1163 
1164         /* if station isn't there, neither is the key */
1165         if (sta_id == IWL_INVALID_STATION)
1166                 return -ENOENT;
1167 
1168         spin_lock_bh(&priv->sta_lock);
1169         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
1170         if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE))
1171                 sta_id = IWL_INVALID_STATION;
1172         spin_unlock_bh(&priv->sta_lock);
1173 
1174         if (sta_id == IWL_INVALID_STATION)
1175                 return 0;
1176 
1177         lockdep_assert_held(&priv->mutex);
1178 
1179         ctx->key_mapping_keys--;
1180 
1181         IWL_DEBUG_WEP(priv, "Remove dynamic key: idx=%d sta=%d\n",
1182                       keyconf->keyidx, sta_id);
1183 
1184         if (!test_and_clear_bit(keyconf->hw_key_idx, &priv->ucode_key_table))
1185                 IWL_ERR(priv, "offset %d not used in uCode key table.\n",
1186                         keyconf->hw_key_idx);
1187 
1188         key_flags = cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
1189         key_flags |= STA_KEY_FLG_MAP_KEY_MSK | STA_KEY_FLG_NO_ENC |
1190                      STA_KEY_FLG_INVALID;
1191 
1192         if (!(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE))
1193                 key_flags |= STA_KEY_MULTICAST_MSK;
1194 
1195         sta_cmd.key.key_flags = key_flags;
1196         sta_cmd.key.key_offset = keyconf->hw_key_idx;
1197         sta_cmd.sta.modify_mask = STA_MODIFY_KEY_MASK;
1198         sta_cmd.mode = STA_CONTROL_MODIFY_MSK;
1199 
1200         return iwl_send_add_sta(priv, &sta_cmd, 0);
1201 }
1202 
1203 int iwl_set_dynamic_key(struct iwl_priv *priv,
1204                         struct iwl_rxon_context *ctx,
1205                         struct ieee80211_key_conf *keyconf,
1206                         struct ieee80211_sta *sta)
1207 {
1208         struct ieee80211_key_seq seq;
1209         u16 p1k[5];
1210         int ret;
1211         u8 sta_id = iwlagn_key_sta_id(priv, ctx->vif, sta);
1212         const u8 *addr;
1213 
1214         if (sta_id == IWL_INVALID_STATION)
1215                 return -EINVAL;
1216 
1217         lockdep_assert_held(&priv->mutex);
1218 
1219         keyconf->hw_key_idx = iwl_get_free_ucode_key_offset(priv);
1220         if (keyconf->hw_key_idx == WEP_INVALID_OFFSET)
1221                 return -ENOSPC;
1222 
1223         ctx->key_mapping_keys++;
1224 
1225         switch (keyconf->cipher) {
1226         case WLAN_CIPHER_SUITE_TKIP:
1227                 if (sta)
1228                         addr = sta->addr;
1229                 else /* station mode case only */
1230                         addr = ctx->active.bssid_addr;
1231 
1232                 /* pre-fill phase 1 key into device cache */
1233                 ieee80211_get_key_rx_seq(keyconf, 0, &seq);
1234                 ieee80211_get_tkip_rx_p1k(keyconf, addr, seq.tkip.iv32, p1k);
1235                 ret = iwlagn_send_sta_key(priv, keyconf, sta_id,
1236                                           seq.tkip.iv32, p1k, 0);
1237                 break;
1238         case WLAN_CIPHER_SUITE_CCMP:
1239         case WLAN_CIPHER_SUITE_WEP40:
1240         case WLAN_CIPHER_SUITE_WEP104:
1241                 ret = iwlagn_send_sta_key(priv, keyconf, sta_id,
1242                                           0, NULL, 0);
1243                 break;
1244         default:
1245                 IWL_ERR(priv, "Unknown cipher %x\n", keyconf->cipher);
1246                 ret = -EINVAL;
1247         }
1248 
1249         if (ret) {
1250                 ctx->key_mapping_keys--;
1251                 clear_bit(keyconf->hw_key_idx, &priv->ucode_key_table);
1252         }
1253 
1254         IWL_DEBUG_WEP(priv, "Set dynamic key: cipher=%x len=%d idx=%d sta=%pM ret=%d\n",
1255                       keyconf->cipher, keyconf->keylen, keyconf->keyidx,
1256                       sta ? sta->addr : NULL, ret);
1257 
1258         return ret;
1259 }
1260 
1261 /**
1262  * iwlagn_alloc_bcast_station - add broadcast station into driver's station table.
1263  *
1264  * This adds the broadcast station into the driver's station table
1265  * and marks it driver active, so that it will be restored to the
1266  * device at the next best time.
1267  */
1268 int iwlagn_alloc_bcast_station(struct iwl_priv *priv,
1269                                struct iwl_rxon_context *ctx)
1270 {
1271         struct iwl_link_quality_cmd *link_cmd;
1272         u8 sta_id;
1273 
1274         spin_lock_bh(&priv->sta_lock);
1275         sta_id = iwl_prep_station(priv, ctx, iwl_bcast_addr, false, NULL);
1276         if (sta_id == IWL_INVALID_STATION) {
1277                 IWL_ERR(priv, "Unable to prepare broadcast station\n");
1278                 spin_unlock_bh(&priv->sta_lock);
1279 
1280                 return -EINVAL;
1281         }
1282 
1283         priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
1284         priv->stations[sta_id].used |= IWL_STA_BCAST;
1285         spin_unlock_bh(&priv->sta_lock);
1286 
1287         link_cmd = iwl_sta_alloc_lq(priv, ctx, sta_id);
1288         if (!link_cmd) {
1289                 IWL_ERR(priv,
1290                         "Unable to initialize rate scaling for bcast station.\n");
1291                 return -ENOMEM;
1292         }
1293 
1294         spin_lock_bh(&priv->sta_lock);
1295         priv->stations[sta_id].lq = link_cmd;
1296         spin_unlock_bh(&priv->sta_lock);
1297 
1298         return 0;
1299 }
1300 
1301 /**
1302  * iwl_update_bcast_station - update broadcast station's LQ command
1303  *
1304  * Only used by iwlagn. Placed here to have all bcast station management
1305  * code together.
1306  */
1307 int iwl_update_bcast_station(struct iwl_priv *priv,
1308                              struct iwl_rxon_context *ctx)
1309 {
1310         struct iwl_link_quality_cmd *link_cmd;
1311         u8 sta_id = ctx->bcast_sta_id;
1312 
1313         link_cmd = iwl_sta_alloc_lq(priv, ctx, sta_id);
1314         if (!link_cmd) {
1315                 IWL_ERR(priv, "Unable to initialize rate scaling for bcast station.\n");
1316                 return -ENOMEM;
1317         }
1318 
1319         spin_lock_bh(&priv->sta_lock);
1320         if (priv->stations[sta_id].lq)
1321                 kfree(priv->stations[sta_id].lq);
1322         else
1323                 IWL_DEBUG_INFO(priv, "Bcast station rate scaling has not been initialized yet.\n");
1324         priv->stations[sta_id].lq = link_cmd;
1325         spin_unlock_bh(&priv->sta_lock);
1326 
1327         return 0;
1328 }
1329 
1330 int iwl_update_bcast_stations(struct iwl_priv *priv)
1331 {
1332         struct iwl_rxon_context *ctx;
1333         int ret = 0;
1334 
1335         for_each_context(priv, ctx) {
1336                 ret = iwl_update_bcast_station(priv, ctx);
1337                 if (ret)
1338                         break;
1339         }
1340 
1341         return ret;
1342 }
1343 
1344 /**
1345  * iwl_sta_tx_modify_enable_tid - Enable Tx for this TID in station table
1346  */
1347 int iwl_sta_tx_modify_enable_tid(struct iwl_priv *priv, int sta_id, int tid)
1348 {
1349         struct iwl_addsta_cmd sta_cmd;
1350 
1351         lockdep_assert_held(&priv->mutex);
1352 
1353         /* Remove "disable" flag, to enable Tx for this TID */
1354         spin_lock_bh(&priv->sta_lock);
1355         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_TID_DISABLE_TX;
1356         priv->stations[sta_id].sta.tid_disable_tx &= cpu_to_le16(~(1 << tid));
1357         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1358         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1359         spin_unlock_bh(&priv->sta_lock);
1360 
1361         return iwl_send_add_sta(priv, &sta_cmd, 0);
1362 }
1363 
1364 int iwl_sta_rx_agg_start(struct iwl_priv *priv, struct ieee80211_sta *sta,
1365                          int tid, u16 ssn)
1366 {
1367         int sta_id;
1368         struct iwl_addsta_cmd sta_cmd;
1369 
1370         lockdep_assert_held(&priv->mutex);
1371 
1372         sta_id = iwl_sta_id(sta);
1373         if (sta_id == IWL_INVALID_STATION)
1374                 return -ENXIO;
1375 
1376         spin_lock_bh(&priv->sta_lock);
1377         priv->stations[sta_id].sta.station_flags_msk = 0;
1378         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
1379         priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
1380         priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
1381         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1382         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1383         spin_unlock_bh(&priv->sta_lock);
1384 
1385         return iwl_send_add_sta(priv, &sta_cmd, 0);
1386 }
1387 
1388 int iwl_sta_rx_agg_stop(struct iwl_priv *priv, struct ieee80211_sta *sta,
1389                         int tid)
1390 {
1391         int sta_id;
1392         struct iwl_addsta_cmd sta_cmd;
1393 
1394         lockdep_assert_held(&priv->mutex);
1395 
1396         sta_id = iwl_sta_id(sta);
1397         if (sta_id == IWL_INVALID_STATION) {
1398                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
1399                 return -ENXIO;
1400         }
1401 
1402         spin_lock_bh(&priv->sta_lock);
1403         priv->stations[sta_id].sta.station_flags_msk = 0;
1404         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
1405         priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
1406         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
1407         memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
1408         spin_unlock_bh(&priv->sta_lock);
1409 
1410         return iwl_send_add_sta(priv, &sta_cmd, 0);
1411 }
1412 
1413 
1414 
1415 void iwl_sta_modify_sleep_tx_count(struct iwl_priv *priv, int sta_id, int cnt)
1416 {
1417         struct iwl_addsta_cmd cmd = {
1418                 .mode = STA_CONTROL_MODIFY_MSK,
1419                 .station_flags = STA_FLG_PWR_SAVE_MSK,
1420                 .station_flags_msk = STA_FLG_PWR_SAVE_MSK,
1421                 .sta.sta_id = sta_id,
1422                 .sta.modify_mask = STA_MODIFY_SLEEP_TX_COUNT_MSK,
1423                 .sleep_tx_count = cpu_to_le16(cnt),
1424         };
1425 
1426         iwl_send_add_sta(priv, &cmd, CMD_ASYNC);
1427 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/net/wireless/intel/iwlwifi/dvm/sta.c

DEFINITIONS
