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 } 724