drivers/net/wireless/intel/iwlwifi/mvm/tdls.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2014 Intel Mobile Communications GmbH
   9  * Copyright(c) 2017 Intel Deutschland GmbH
  10  * Copyright(C) 2018 - 2019 Intel Corporation
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of version 2 of the GNU General Public License as
  14  * published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called COPYING.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <linuxwifi@intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  * BSD LICENSE
  29  *
  30  * Copyright(c) 2014 Intel Mobile Communications GmbH
  31  * Copyright(c) 2017 Intel Deutschland GmbH
  32  * Copyright(C) 2018 - 2019 Intel Corporation
  33  * All rights reserved.
  34  *
  35  * Redistribution and use in source and binary forms, with or without
  36  * modification, are permitted provided that the following conditions
  37  * are met:
  38  *
  39  *  * Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  *  * Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in
  43  *    the documentation and/or other materials provided with the
  44  *    distribution.
  45  *  * Neither the name Intel Corporation nor the names of its
  46  *    contributors may be used to endorse or promote products derived
  47  *    from this software without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  50  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  51  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  52  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  53  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  54  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  55  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  56  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  57  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  58  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  59  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  60  *
  61  *****************************************************************************/
  62
  63 #include <linux/etherdevice.h>
  64 #include "mvm.h"
  65 #include "time-event.h"
  66 #include "iwl-io.h"
  67 #include "iwl-prph.h"
  68
  69 #define TU_TO_US(x) (x * 1024)
  70 #define TU_TO_MS(x) (TU_TO_US(x) / 1000)
  71
  72 void iwl_mvm_teardown_tdls_peers(struct iwl_mvm *mvm)
  73 {
  74         struct ieee80211_sta *sta;
  75         struct iwl_mvm_sta *mvmsta;
  76         int i;
  77
  78         lockdep_assert_held(&mvm->mutex);
  79
  80         for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
  81                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
  82                                                 lockdep_is_held(&mvm->mutex));
  83                 if (!sta || IS_ERR(sta) || !sta->tdls)
  84                         continue;
  85
  86                 mvmsta = iwl_mvm_sta_from_mac80211(sta);
  87                 ieee80211_tdls_oper_request(mvmsta->vif, sta->addr,
  88                                 NL80211_TDLS_TEARDOWN,
  89                                 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED,
  90                                 GFP_KERNEL);
  91         }
  92 }
  93
  94 int iwl_mvm_tdls_sta_count(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
  95 {
  96         struct ieee80211_sta *sta;
  97         struct iwl_mvm_sta *mvmsta;
  98         int count = 0;
  99         int i;
 100
 101         lockdep_assert_held(&mvm->mutex);
 102
 103         for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
 104                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 105                                                 lockdep_is_held(&mvm->mutex));
 106                 if (!sta || IS_ERR(sta) || !sta->tdls)
 107                         continue;
 108
 109                 if (vif) {
 110                         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 111                         if (mvmsta->vif != vif)
 112                                 continue;
 113                 }
 114
 115                 count++;
 116         }
 117
 118         return count;
 119 }
 120
 121 static void iwl_mvm_tdls_config(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 122 {
 123         struct iwl_rx_packet *pkt;
 124         struct iwl_tdls_config_res *resp;
 125         struct iwl_tdls_config_cmd tdls_cfg_cmd = {};
 126         struct iwl_host_cmd cmd = {
 127                 .id = TDLS_CONFIG_CMD,
 128                 .flags = CMD_WANT_SKB,
 129                 .data = { &tdls_cfg_cmd, },
 130                 .len = { sizeof(struct iwl_tdls_config_cmd), },
 131         };
 132         struct ieee80211_sta *sta;
 133         int ret, i, cnt;
 134         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 135
 136         lockdep_assert_held(&mvm->mutex);
 137
 138         tdls_cfg_cmd.id_and_color =
 139                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 140         tdls_cfg_cmd.tx_to_ap_tid = IWL_MVM_TDLS_FW_TID;
 141         tdls_cfg_cmd.tx_to_ap_ssn = cpu_to_le16(0); /* not used for now */
 142
 143         /* for now the Tx cmd is empty and unused */
 144
 145         /* populate TDLS peer data */
 146         cnt = 0;
 147         for (i = 0; i < ARRAY_SIZE(mvm->fw_id_to_mac_id); i++) {
 148                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 149                                                 lockdep_is_held(&mvm->mutex));
 150                 if (IS_ERR_OR_NULL(sta) || !sta->tdls)
 151                         continue;
 152
 153                 tdls_cfg_cmd.sta_info[cnt].sta_id = i;
 154                 tdls_cfg_cmd.sta_info[cnt].tx_to_peer_tid =
 155                                                         IWL_MVM_TDLS_FW_TID;
 156                 tdls_cfg_cmd.sta_info[cnt].tx_to_peer_ssn = cpu_to_le16(0);
 157                 tdls_cfg_cmd.sta_info[cnt].is_initiator =
 158                                 cpu_to_le32(sta->tdls_initiator ? 1 : 0);
 159
 160                 cnt++;
 161         }
 162
 163         tdls_cfg_cmd.tdls_peer_count = cnt;
 164         IWL_DEBUG_TDLS(mvm, "send TDLS config to FW for %d peers\n", cnt);
 165
 166         ret = iwl_mvm_send_cmd(mvm, &cmd);
 167         if (WARN_ON_ONCE(ret))
 168                 return;
 169
 170         pkt = cmd.resp_pkt;
 171
 172         WARN_ON_ONCE(iwl_rx_packet_payload_len(pkt) != sizeof(*resp));
 173
 174         /* we don't really care about the response at this point */
 175
 176         iwl_free_resp(&cmd);
 177 }
 178
 179 void iwl_mvm_recalc_tdls_state(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 180                                bool sta_added)
 181 {
 182         int tdls_sta_cnt = iwl_mvm_tdls_sta_count(mvm, vif);
 183
 184         /* when the first peer joins, send a power update first */
 185         if (tdls_sta_cnt == 1 && sta_added)
 186                 iwl_mvm_power_update_mac(mvm);
 187
 188         /* Configure the FW with TDLS peer info only if TDLS channel switch
 189          * capability is set.
 190          * TDLS config data is used currently only in TDLS channel switch code.
 191          * Supposed to serve also TDLS buffer station which is not implemneted
 192          * yet in FW*/
 193         if (fw_has_capa(&mvm->fw->ucode_capa,
 194                         IWL_UCODE_TLV_CAPA_TDLS_CHANNEL_SWITCH))
 195                 iwl_mvm_tdls_config(mvm, vif);
 196
 197         /* when the last peer leaves, send a power update last */
 198         if (tdls_sta_cnt == 0 && !sta_added)
 199                 iwl_mvm_power_update_mac(mvm);
 200 }
 201
 202 void iwl_mvm_mac_mgd_protect_tdls_discover(struct ieee80211_hw *hw,
 203                                            struct ieee80211_vif *vif)
 204 {
 205         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 206         u32 duration = 2 * vif->bss_conf.dtim_period * vif->bss_conf.beacon_int;
 207
 208         mutex_lock(&mvm->mutex);
 209         /* Protect the session to hear the TDLS setup response on the channel */
 210         iwl_mvm_protect_session(mvm, vif, duration, duration, 100, true);
 211         mutex_unlock(&mvm->mutex);
 212 }
 213
 214 static const char *
 215 iwl_mvm_tdls_cs_state_str(enum iwl_mvm_tdls_cs_state state)
 216 {
 217         switch (state) {
 218         case IWL_MVM_TDLS_SW_IDLE:
 219                 return "IDLE";
 220         case IWL_MVM_TDLS_SW_REQ_SENT:
 221                 return "REQ SENT";
 222         case IWL_MVM_TDLS_SW_RESP_RCVD:
 223                 return "RESP RECEIVED";
 224         case IWL_MVM_TDLS_SW_REQ_RCVD:
 225                 return "REQ RECEIVED";
 226         case IWL_MVM_TDLS_SW_ACTIVE:
 227                 return "ACTIVE";
 228         }
 229
 230         return NULL;
 231 }
 232
 233 static void iwl_mvm_tdls_update_cs_state(struct iwl_mvm *mvm,
 234                                          enum iwl_mvm_tdls_cs_state state)
 235 {
 236         if (mvm->tdls_cs.state == state)
 237                 return;
 238
 239         IWL_DEBUG_TDLS(mvm, "TDLS channel switch state: %s -> %s\n",
 240                        iwl_mvm_tdls_cs_state_str(mvm->tdls_cs.state),
 241                        iwl_mvm_tdls_cs_state_str(state));
 242         mvm->tdls_cs.state = state;
 243
 244         /* we only send requests to our switching peer - update sent time */
 245         if (state == IWL_MVM_TDLS_SW_REQ_SENT)
 246                 mvm->tdls_cs.peer.sent_timestamp = iwl_mvm_get_systime(mvm);
 247
 248         if (state == IWL_MVM_TDLS_SW_IDLE)
 249                 mvm->tdls_cs.cur_sta_id = IWL_MVM_INVALID_STA;
 250 }
 251
 252 void iwl_mvm_rx_tdls_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 253 {
 254         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 255         struct iwl_tdls_channel_switch_notif *notif = (void *)pkt->data;
 256         struct ieee80211_sta *sta;
 257         unsigned int delay;
 258         struct iwl_mvm_sta *mvmsta;
 259         struct ieee80211_vif *vif;
 260         u32 sta_id = le32_to_cpu(notif->sta_id);
 261
 262         lockdep_assert_held(&mvm->mutex);
 263
 264         /* can fail sometimes */
 265         if (!le32_to_cpu(notif->status)) {
 266                 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
 267                 return;
 268         }
 269
 270         if (WARN_ON(sta_id >= IWL_MVM_STATION_COUNT))
 271                 return;
 272
 273         sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
 274                                         lockdep_is_held(&mvm->mutex));
 275         /* the station may not be here, but if it is, it must be a TDLS peer */
 276         if (IS_ERR_OR_NULL(sta) || WARN_ON(!sta->tdls))
 277                 return;
 278
 279         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 280         vif = mvmsta->vif;
 281
 282         /*
 283          * Update state and possibly switch again after this is over (DTIM).
 284          * Also convert TU to msec.
 285          */
 286         delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int);
 287         mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 288                          msecs_to_jiffies(delay));
 289
 290         iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_ACTIVE);
 291 }
 292
 293 static int
 294 iwl_mvm_tdls_check_action(struct iwl_mvm *mvm,
 295                           enum iwl_tdls_channel_switch_type type,
 296                           const u8 *peer, bool peer_initiator, u32 timestamp)
 297 {
 298         bool same_peer = false;
 299         int ret = 0;
 300
 301         /* get the existing peer if it's there */
 302         if (mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE &&
 303             mvm->tdls_cs.cur_sta_id != IWL_MVM_INVALID_STA) {
 304                 struct ieee80211_sta *sta = rcu_dereference_protected(
 305                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id],
 306                                 lockdep_is_held(&mvm->mutex));
 307                 if (!IS_ERR_OR_NULL(sta))
 308                         same_peer = ether_addr_equal(peer, sta->addr);
 309         }
 310
 311         switch (mvm->tdls_cs.state) {
 312         case IWL_MVM_TDLS_SW_IDLE:
 313                 /*
 314                  * might be spurious packet from the peer after the switch is
 315                  * already done
 316                  */
 317                 if (type == TDLS_MOVE_CH)
 318                         ret = -EINVAL;
 319                 break;
 320         case IWL_MVM_TDLS_SW_REQ_SENT:
 321                 /* only allow requests from the same peer */
 322                 if (!same_peer)
 323                         ret = -EBUSY;
 324                 else if (type == TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH &&
 325                          !peer_initiator)
 326                         /*
 327                          * We received a ch-switch request while an outgoing
 328                          * one is pending. Allow it if the peer is the link
 329                          * initiator.
 330                          */
 331                         ret = -EBUSY;
 332                 else if (type == TDLS_SEND_CHAN_SW_REQ)
 333                         /* wait for idle before sending another request */
 334                         ret = -EBUSY;
 335                 else if (timestamp <= mvm->tdls_cs.peer.sent_timestamp)
 336                         /* we got a stale response - ignore it */
 337                         ret = -EINVAL;
 338                 break;
 339         case IWL_MVM_TDLS_SW_RESP_RCVD:
 340                 /*
 341                  * we are waiting for the FW to give an "active" notification,
 342                  * so ignore requests in the meantime
 343                  */
 344                 ret = -EBUSY;
 345                 break;
 346         case IWL_MVM_TDLS_SW_REQ_RCVD:
 347                 /* as above, allow the link initiator to proceed */
 348                 if (type == TDLS_SEND_CHAN_SW_REQ) {
 349                         if (!same_peer)
 350                                 ret = -EBUSY;
 351                         else if (peer_initiator) /* they are the initiator */
 352                                 ret = -EBUSY;
 353                 } else if (type == TDLS_MOVE_CH) {
 354                         ret = -EINVAL;
 355                 }
 356                 break;
 357         case IWL_MVM_TDLS_SW_ACTIVE:
 358                 /*
 359                  * the only valid request when active is a request to return
 360                  * to the base channel by the current off-channel peer
 361                  */
 362                 if (type != TDLS_MOVE_CH || !same_peer)
 363                         ret = -EBUSY;
 364                 break;
 365         }
 366
 367         if (ret)
 368                 IWL_DEBUG_TDLS(mvm,
 369                                "Invalid TDLS action %d state %d peer %pM same_peer %d initiator %d\n",
 370                                type, mvm->tdls_cs.state, peer, same_peer,
 371                                peer_initiator);
 372
 373         return ret;
 374 }
 375
 376 static int
 377 iwl_mvm_tdls_config_channel_switch(struct iwl_mvm *mvm,
 378                                    struct ieee80211_vif *vif,
 379                                    enum iwl_tdls_channel_switch_type type,
 380                                    const u8 *peer, bool peer_initiator,
 381                                    u8 oper_class,
 382                                    struct cfg80211_chan_def *chandef,
 383                                    u32 timestamp, u16 switch_time,
 384                                    u16 switch_timeout, struct sk_buff *skb,
 385                                    u32 ch_sw_tm_ie)
 386 {
 387         struct ieee80211_sta *sta;
 388         struct iwl_mvm_sta *mvmsta;
 389         struct ieee80211_tx_info *info;
 390         struct ieee80211_hdr *hdr;
 391         struct iwl_tdls_channel_switch_cmd cmd = {0};
 392         struct iwl_tdls_channel_switch_cmd_tail *tail =
 393                 iwl_mvm_chan_info_cmd_tail(mvm, &cmd.ci);
 394         u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm);
 395         int ret;
 396
 397         lockdep_assert_held(&mvm->mutex);
 398
 399         ret = iwl_mvm_tdls_check_action(mvm, type, peer, peer_initiator,
 400                                         timestamp);
 401         if (ret)
 402                 return ret;
 403
 404         if (!skb || WARN_ON(skb->len > IWL_TDLS_CH_SW_FRAME_MAX_SIZE)) {
 405                 ret = -EINVAL;
 406                 goto out;
 407         }
 408
 409         cmd.switch_type = type;
 410         tail->timing.frame_timestamp = cpu_to_le32(timestamp);
 411         tail->timing.switch_time = cpu_to_le32(switch_time);
 412         tail->timing.switch_timeout = cpu_to_le32(switch_timeout);
 413
 414         rcu_read_lock();
 415         sta = ieee80211_find_sta(vif, peer);
 416         if (!sta) {
 417                 rcu_read_unlock();
 418                 ret = -ENOENT;
 419                 goto out;
 420         }
 421         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 422         cmd.peer_sta_id = cpu_to_le32(mvmsta->sta_id);
 423
 424         if (!chandef) {
 425                 if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT &&
 426                     mvm->tdls_cs.peer.chandef.chan) {
 427                         /* actually moving to the channel */
 428                         chandef = &mvm->tdls_cs.peer.chandef;
 429                 } else if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_ACTIVE &&
 430                            type == TDLS_MOVE_CH) {
 431                         /* we need to return to base channel */
 432                         struct ieee80211_chanctx_conf *chanctx =
 433                                         rcu_dereference(vif->chanctx_conf);
 434
 435                         if (WARN_ON_ONCE(!chanctx)) {
 436                                 rcu_read_unlock();
 437                                 goto out;
 438                         }
 439
 440                         chandef = &chanctx->def;
 441                 }
 442         }
 443
 444         if (chandef)
 445                 iwl_mvm_set_chan_info_chandef(mvm, &cmd.ci, chandef);
 446
 447         /* keep quota calculation simple for now - 50% of DTIM for TDLS */
 448         tail->timing.max_offchan_duration =
 449                         cpu_to_le32(TU_TO_US(vif->bss_conf.dtim_period *
 450                                              vif->bss_conf.beacon_int) / 2);
 451
 452         /* Switch time is the first element in the switch-timing IE. */
 453         tail->frame.switch_time_offset = cpu_to_le32(ch_sw_tm_ie + 2);
 454
 455         info = IEEE80211_SKB_CB(skb);
 456         hdr = (void *)skb->data;
 457         if (info->control.hw_key) {
 458                 if (info->control.hw_key->cipher != WLAN_CIPHER_SUITE_CCMP) {
 459                         rcu_read_unlock();
 460                         ret = -EINVAL;
 461                         goto out;
 462                 }
 463                 iwl_mvm_set_tx_cmd_ccmp(info, &tail->frame.tx_cmd);
 464         }
 465
 466         iwl_mvm_set_tx_cmd(mvm, skb, &tail->frame.tx_cmd, info,
 467                            mvmsta->sta_id);
 468
 469         iwl_mvm_set_tx_cmd_rate(mvm, &tail->frame.tx_cmd, info, sta,
 470                                 hdr->frame_control);
 471         rcu_read_unlock();
 472
 473         memcpy(tail->frame.data, skb->data, skb->len);
 474
 475         ret = iwl_mvm_send_cmd_pdu(mvm, TDLS_CHANNEL_SWITCH_CMD, 0, len, &cmd);
 476         if (ret) {
 477                 IWL_ERR(mvm, "Failed to send TDLS_CHANNEL_SWITCH cmd: %d\n",
 478                         ret);
 479                 goto out;
 480         }
 481
 482         /* channel switch has started, update state */
 483         if (type != TDLS_MOVE_CH) {
 484                 mvm->tdls_cs.cur_sta_id = mvmsta->sta_id;
 485                 iwl_mvm_tdls_update_cs_state(mvm,
 486                                              type == TDLS_SEND_CHAN_SW_REQ ?
 487                                              IWL_MVM_TDLS_SW_REQ_SENT :
 488                                              IWL_MVM_TDLS_SW_REQ_RCVD);
 489         } else {
 490                 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_RESP_RCVD);
 491         }
 492
 493 out:
 494
 495         /* channel switch failed - we are idle */
 496         if (ret)
 497                 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
 498
 499         return ret;
 500 }
 501
 502 void iwl_mvm_tdls_ch_switch_work(struct work_struct *work)
 503 {
 504         struct iwl_mvm *mvm;
 505         struct ieee80211_sta *sta;
 506         struct iwl_mvm_sta *mvmsta;
 507         struct ieee80211_vif *vif;
 508         unsigned int delay;
 509         int ret;
 510
 511         mvm = container_of(work, struct iwl_mvm, tdls_cs.dwork.work);
 512         mutex_lock(&mvm->mutex);
 513
 514         /* called after an active channel switch has finished or timed-out */
 515         iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE);
 516
 517         /* station might be gone, in that case do nothing */
 518         if (mvm->tdls_cs.peer.sta_id == IWL_MVM_INVALID_STA)
 519                 goto out;
 520
 521         sta = rcu_dereference_protected(
 522                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id],
 523                                 lockdep_is_held(&mvm->mutex));
 524         /* the station may not be here, but if it is, it must be a TDLS peer */
 525         if (!sta || IS_ERR(sta) || WARN_ON(!sta->tdls))
 526                 goto out;
 527
 528         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 529         vif = mvmsta->vif;
 530         ret = iwl_mvm_tdls_config_channel_switch(mvm, vif,
 531                                                  TDLS_SEND_CHAN_SW_REQ,
 532                                                  sta->addr,
 533                                                  mvm->tdls_cs.peer.initiator,
 534                                                  mvm->tdls_cs.peer.op_class,
 535                                                  &mvm->tdls_cs.peer.chandef,
 536                                                  0, 0, 0,
 537                                                  mvm->tdls_cs.peer.skb,
 538                                                  mvm->tdls_cs.peer.ch_sw_tm_ie);
 539         if (ret)
 540                 IWL_ERR(mvm, "Not sending TDLS channel switch: %d\n", ret);
 541
 542         /* retry after a DTIM if we failed sending now */
 543         delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int);
 544         schedule_delayed_work(&mvm->tdls_cs.dwork, msecs_to_jiffies(delay));
 545 out:
 546         mutex_unlock(&mvm->mutex);
 547 }
 548
 549 int
 550 iwl_mvm_tdls_channel_switch(struct ieee80211_hw *hw,
 551                             struct ieee80211_vif *vif,
 552                             struct ieee80211_sta *sta, u8 oper_class,
 553                             struct cfg80211_chan_def *chandef,
 554                             struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie)
 555 {
 556         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 557         struct iwl_mvm_sta *mvmsta;
 558         unsigned int delay;
 559         int ret;
 560
 561         mutex_lock(&mvm->mutex);
 562
 563         IWL_DEBUG_TDLS(mvm, "TDLS channel switch with %pM ch %d width %d\n",
 564                        sta->addr, chandef->chan->center_freq, chandef->width);
 565
 566         /* we only support a single peer for channel switching */
 567         if (mvm->tdls_cs.peer.sta_id != IWL_MVM_INVALID_STA) {
 568                 IWL_DEBUG_TDLS(mvm,
 569                                "Existing peer. Can't start switch with %pM\n",
 570                                sta->addr);
 571                 ret = -EBUSY;
 572                 goto out;
 573         }
 574
 575         ret = iwl_mvm_tdls_config_channel_switch(mvm, vif,
 576                                                  TDLS_SEND_CHAN_SW_REQ,
 577                                                  sta->addr, sta->tdls_initiator,
 578                                                  oper_class, chandef, 0, 0, 0,
 579                                                  tmpl_skb, ch_sw_tm_ie);
 580         if (ret)
 581                 goto out;
 582
 583         /*
 584          * Mark the peer as "in tdls switch" for this vif. We only allow a
 585          * single such peer per vif.
 586          */
 587         mvm->tdls_cs.peer.skb = skb_copy(tmpl_skb, GFP_KERNEL);
 588         if (!mvm->tdls_cs.peer.skb) {
 589                 ret = -ENOMEM;
 590                 goto out;
 591         }
 592
 593         mvmsta = iwl_mvm_sta_from_mac80211(sta);
 594         mvm->tdls_cs.peer.sta_id = mvmsta->sta_id;
 595         mvm->tdls_cs.peer.chandef = *chandef;
 596         mvm->tdls_cs.peer.initiator = sta->tdls_initiator;
 597         mvm->tdls_cs.peer.op_class = oper_class;
 598         mvm->tdls_cs.peer.ch_sw_tm_ie = ch_sw_tm_ie;
 599
 600         /*
 601          * Wait for 2 DTIM periods before attempting the next switch. The next
 602          * switch will be made sooner if the current one completes before that.
 603          */
 604         delay = 2 * TU_TO_MS(vif->bss_conf.dtim_period *
 605                              vif->bss_conf.beacon_int);
 606         mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 607                          msecs_to_jiffies(delay));
 608
 609 out:
 610         mutex_unlock(&mvm->mutex);
 611         return ret;
 612 }
 613
 614 void iwl_mvm_tdls_cancel_channel_switch(struct ieee80211_hw *hw,
 615                                         struct ieee80211_vif *vif,
 616                                         struct ieee80211_sta *sta)
 617 {
 618         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 619         struct ieee80211_sta *cur_sta;
 620         bool wait_for_phy = false;
 621
 622         mutex_lock(&mvm->mutex);
 623
 624         IWL_DEBUG_TDLS(mvm, "TDLS cancel channel switch with %pM\n", sta->addr);
 625
 626         /* we only support a single peer for channel switching */
 627         if (mvm->tdls_cs.peer.sta_id == IWL_MVM_INVALID_STA) {
 628                 IWL_DEBUG_TDLS(mvm, "No ch switch peer - %pM\n", sta->addr);
 629                 goto out;
 630         }
 631
 632         cur_sta = rcu_dereference_protected(
 633                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id],
 634                                 lockdep_is_held(&mvm->mutex));
 635         /* make sure it's the same peer */
 636         if (cur_sta != sta)
 637                 goto out;
 638
 639         /*
 640          * If we're currently in a switch because of the now canceled peer,
 641          * wait a DTIM here to make sure the phy is back on the base channel.
 642          * We can't otherwise force it.
 643          */
 644         if (mvm->tdls_cs.cur_sta_id == mvm->tdls_cs.peer.sta_id &&
 645             mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE)
 646                 wait_for_phy = true;
 647
 648         mvm->tdls_cs.peer.sta_id = IWL_MVM_INVALID_STA;
 649         dev_kfree_skb(mvm->tdls_cs.peer.skb);
 650         mvm->tdls_cs.peer.skb = NULL;
 651
 652 out:
 653         mutex_unlock(&mvm->mutex);
 654
 655         /* make sure the phy is on the base channel */
 656         if (wait_for_phy)
 657                 msleep(TU_TO_MS(vif->bss_conf.dtim_period *
 658                                 vif->bss_conf.beacon_int));
 659
 660         /* flush the channel switch state */
 661         flush_delayed_work(&mvm->tdls_cs.dwork);
 662
 663         IWL_DEBUG_TDLS(mvm, "TDLS ending channel switch with %pM\n", sta->addr);
 664 }
 665
 666 void
 667 iwl_mvm_tdls_recv_channel_switch(struct ieee80211_hw *hw,
 668                                  struct ieee80211_vif *vif,
 669                                  struct ieee80211_tdls_ch_sw_params *params)
 670 {
 671         struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw);
 672         enum iwl_tdls_channel_switch_type type;
 673         unsigned int delay;
 674         const char *action_str =
 675                 params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ?
 676                 "REQ" : "RESP";
 677
 678         mutex_lock(&mvm->mutex);
 679
 680         IWL_DEBUG_TDLS(mvm,
 681                        "Received TDLS ch switch action %s from %pM status %d\n",
 682                        action_str, params->sta->addr, params->status);
 683
 684         /*
 685          * we got a non-zero status from a peer we were switching to - move to
 686          * the idle state and retry again later
 687          */
 688         if (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE &&
 689             params->status != 0 &&
 690             mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT &&
 691             mvm->tdls_cs.cur_sta_id != IWL_MVM_INVALID_STA) {
 692                 struct ieee80211_sta *cur_sta;
 693
 694                 /* make sure it's the same peer */
 695                 cur_sta = rcu_dereference_protected(
 696                                 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id],
 697                                 lockdep_is_held(&mvm->mutex));
 698                 if (cur_sta == params->sta) {
 699                         iwl_mvm_tdls_update_cs_state(mvm,
 700                                                      IWL_MVM_TDLS_SW_IDLE);
 701                         goto retry;
 702                 }
 703         }
 704
 705         type = (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST) ?
 706                TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH : TDLS_MOVE_CH;
 707
 708         iwl_mvm_tdls_config_channel_switch(mvm, vif, type, params->sta->addr,
 709                                            params->sta->tdls_initiator, 0,
 710                                            params->chandef, params->timestamp,
 711                                            params->switch_time,
 712                                            params->switch_timeout,
 713                                            params->tmpl_skb,
 714                                            params->ch_sw_tm_ie);
 715
 716 retry:
 717         /* register a timeout in case we don't succeed in switching */
 718         delay = vif->bss_conf.dtim_period * vif->bss_conf.beacon_int *
 719                 1024 / 1000;
 720         mod_delayed_work(system_wq, &mvm->tdls_cs.dwork,
 721                          msecs_to_jiffies(delay));
 722         mutex_unlock(&mvm->mutex);
 723 }