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 /* 209 * iwl_mvm_protect_session() reads directly from the device 210 * (the system time), so make sure it is available. 211 */ 212 if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_PROTECT_TDLS)) 213 return; 214 215 mutex_lock(&mvm->mutex); 216 /* Protect the session to hear the TDLS setup response on the channel */ 217 iwl_mvm_protect_session(mvm, vif, duration, duration, 100, true); 218 mutex_unlock(&mvm->mutex); 219 220 iwl_mvm_unref(mvm, IWL_MVM_REF_PROTECT_TDLS); 221 } 222 223 static const char * 224 iwl_mvm_tdls_cs_state_str(enum iwl_mvm_tdls_cs_state state) 225 { 226 switch (state) { 227 case IWL_MVM_TDLS_SW_IDLE: 228 return "IDLE"; 229 case IWL_MVM_TDLS_SW_REQ_SENT: 230 return "REQ SENT"; 231 case IWL_MVM_TDLS_SW_RESP_RCVD: 232 return "RESP RECEIVED"; 233 case IWL_MVM_TDLS_SW_REQ_RCVD: 234 return "REQ RECEIVED"; 235 case IWL_MVM_TDLS_SW_ACTIVE: 236 return "ACTIVE"; 237 } 238 239 return NULL; 240 } 241 242 static void iwl_mvm_tdls_update_cs_state(struct iwl_mvm *mvm, 243 enum iwl_mvm_tdls_cs_state state) 244 { 245 if (mvm->tdls_cs.state == state) 246 return; 247 248 IWL_DEBUG_TDLS(mvm, "TDLS channel switch state: %s -> %s\n", 249 iwl_mvm_tdls_cs_state_str(mvm->tdls_cs.state), 250 iwl_mvm_tdls_cs_state_str(state)); 251 mvm->tdls_cs.state = state; 252 253 /* we only send requests to our switching peer - update sent time */ 254 if (state == IWL_MVM_TDLS_SW_REQ_SENT) 255 mvm->tdls_cs.peer.sent_timestamp = iwl_mvm_get_systime(mvm); 256 257 if (state == IWL_MVM_TDLS_SW_IDLE) 258 mvm->tdls_cs.cur_sta_id = IWL_MVM_INVALID_STA; 259 } 260 261 void iwl_mvm_rx_tdls_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb) 262 { 263 struct iwl_rx_packet *pkt = rxb_addr(rxb); 264 struct iwl_tdls_channel_switch_notif *notif = (void *)pkt->data; 265 struct ieee80211_sta *sta; 266 unsigned int delay; 267 struct iwl_mvm_sta *mvmsta; 268 struct ieee80211_vif *vif; 269 u32 sta_id = le32_to_cpu(notif->sta_id); 270 271 lockdep_assert_held(&mvm->mutex); 272 273 /* can fail sometimes */ 274 if (!le32_to_cpu(notif->status)) { 275 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE); 276 return; 277 } 278 279 if (WARN_ON(sta_id >= IWL_MVM_STATION_COUNT)) 280 return; 281 282 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id], 283 lockdep_is_held(&mvm->mutex)); 284 /* the station may not be here, but if it is, it must be a TDLS peer */ 285 if (IS_ERR_OR_NULL(sta) || WARN_ON(!sta->tdls)) 286 return; 287 288 mvmsta = iwl_mvm_sta_from_mac80211(sta); 289 vif = mvmsta->vif; 290 291 /* 292 * Update state and possibly switch again after this is over (DTIM). 293 * Also convert TU to msec. 294 */ 295 delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int); 296 mod_delayed_work(system_wq, &mvm->tdls_cs.dwork, 297 msecs_to_jiffies(delay)); 298 299 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_ACTIVE); 300 } 301 302 static int 303 iwl_mvm_tdls_check_action(struct iwl_mvm *mvm, 304 enum iwl_tdls_channel_switch_type type, 305 const u8 *peer, bool peer_initiator, u32 timestamp) 306 { 307 bool same_peer = false; 308 int ret = 0; 309 310 /* get the existing peer if it's there */ 311 if (mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE && 312 mvm->tdls_cs.cur_sta_id != IWL_MVM_INVALID_STA) { 313 struct ieee80211_sta *sta = rcu_dereference_protected( 314 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id], 315 lockdep_is_held(&mvm->mutex)); 316 if (!IS_ERR_OR_NULL(sta)) 317 same_peer = ether_addr_equal(peer, sta->addr); 318 } 319 320 switch (mvm->tdls_cs.state) { 321 case IWL_MVM_TDLS_SW_IDLE: 322 /* 323 * might be spurious packet from the peer after the switch is 324 * already done 325 */ 326 if (type == TDLS_MOVE_CH) 327 ret = -EINVAL; 328 break; 329 case IWL_MVM_TDLS_SW_REQ_SENT: 330 /* only allow requests from the same peer */ 331 if (!same_peer) 332 ret = -EBUSY; 333 else if (type == TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH && 334 !peer_initiator) 335 /* 336 * We received a ch-switch request while an outgoing 337 * one is pending. Allow it if the peer is the link 338 * initiator. 339 */ 340 ret = -EBUSY; 341 else if (type == TDLS_SEND_CHAN_SW_REQ) 342 /* wait for idle before sending another request */ 343 ret = -EBUSY; 344 else if (timestamp <= mvm->tdls_cs.peer.sent_timestamp) 345 /* we got a stale response - ignore it */ 346 ret = -EINVAL; 347 break; 348 case IWL_MVM_TDLS_SW_RESP_RCVD: 349 /* 350 * we are waiting for the FW to give an "active" notification, 351 * so ignore requests in the meantime 352 */ 353 ret = -EBUSY; 354 break; 355 case IWL_MVM_TDLS_SW_REQ_RCVD: 356 /* as above, allow the link initiator to proceed */ 357 if (type == TDLS_SEND_CHAN_SW_REQ) { 358 if (!same_peer) 359 ret = -EBUSY; 360 else if (peer_initiator) /* they are the initiator */ 361 ret = -EBUSY; 362 } else if (type == TDLS_MOVE_CH) { 363 ret = -EINVAL; 364 } 365 break; 366 case IWL_MVM_TDLS_SW_ACTIVE: 367 /* 368 * the only valid request when active is a request to return 369 * to the base channel by the current off-channel peer 370 */ 371 if (type != TDLS_MOVE_CH || !same_peer) 372 ret = -EBUSY; 373 break; 374 } 375 376 if (ret) 377 IWL_DEBUG_TDLS(mvm, 378 "Invalid TDLS action %d state %d peer %pM same_peer %d initiator %d\n", 379 type, mvm->tdls_cs.state, peer, same_peer, 380 peer_initiator); 381 382 return ret; 383 } 384 385 static int 386 iwl_mvm_tdls_config_channel_switch(struct iwl_mvm *mvm, 387 struct ieee80211_vif *vif, 388 enum iwl_tdls_channel_switch_type type, 389 const u8 *peer, bool peer_initiator, 390 u8 oper_class, 391 struct cfg80211_chan_def *chandef, 392 u32 timestamp, u16 switch_time, 393 u16 switch_timeout, struct sk_buff *skb, 394 u32 ch_sw_tm_ie) 395 { 396 struct ieee80211_sta *sta; 397 struct iwl_mvm_sta *mvmsta; 398 struct ieee80211_tx_info *info; 399 struct ieee80211_hdr *hdr; 400 struct iwl_tdls_channel_switch_cmd cmd = {0}; 401 struct iwl_tdls_channel_switch_cmd_tail *tail = 402 iwl_mvm_chan_info_cmd_tail(mvm, &cmd.ci); 403 u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm); 404 int ret; 405 406 lockdep_assert_held(&mvm->mutex); 407 408 ret = iwl_mvm_tdls_check_action(mvm, type, peer, peer_initiator, 409 timestamp); 410 if (ret) 411 return ret; 412 413 if (!skb || WARN_ON(skb->len > IWL_TDLS_CH_SW_FRAME_MAX_SIZE)) { 414 ret = -EINVAL; 415 goto out; 416 } 417 418 cmd.switch_type = type; 419 tail->timing.frame_timestamp = cpu_to_le32(timestamp); 420 tail->timing.switch_time = cpu_to_le32(switch_time); 421 tail->timing.switch_timeout = cpu_to_le32(switch_timeout); 422 423 rcu_read_lock(); 424 sta = ieee80211_find_sta(vif, peer); 425 if (!sta) { 426 rcu_read_unlock(); 427 ret = -ENOENT; 428 goto out; 429 } 430 mvmsta = iwl_mvm_sta_from_mac80211(sta); 431 cmd.peer_sta_id = cpu_to_le32(mvmsta->sta_id); 432 433 if (!chandef) { 434 if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT && 435 mvm->tdls_cs.peer.chandef.chan) { 436 /* actually moving to the channel */ 437 chandef = &mvm->tdls_cs.peer.chandef; 438 } else if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_ACTIVE && 439 type == TDLS_MOVE_CH) { 440 /* we need to return to base channel */ 441 struct ieee80211_chanctx_conf *chanctx = 442 rcu_dereference(vif->chanctx_conf); 443 444 if (WARN_ON_ONCE(!chanctx)) { 445 rcu_read_unlock(); 446 goto out; 447 } 448 449 chandef = &chanctx->def; 450 } 451 } 452 453 if (chandef) 454 iwl_mvm_set_chan_info_chandef(mvm, &cmd.ci, chandef); 455 456 /* keep quota calculation simple for now - 50% of DTIM for TDLS */ 457 tail->timing.max_offchan_duration = 458 cpu_to_le32(TU_TO_US(vif->bss_conf.dtim_period * 459 vif->bss_conf.beacon_int) / 2); 460 461 /* Switch time is the first element in the switch-timing IE. */ 462 tail->frame.switch_time_offset = cpu_to_le32(ch_sw_tm_ie + 2); 463 464 info = IEEE80211_SKB_CB(skb); 465 hdr = (void *)skb->data; 466 if (info->control.hw_key) { 467 if (info->control.hw_key->cipher != WLAN_CIPHER_SUITE_CCMP) { 468 rcu_read_unlock(); 469 ret = -EINVAL; 470 goto out; 471 } 472 iwl_mvm_set_tx_cmd_ccmp(info, &tail->frame.tx_cmd); 473 } 474 475 iwl_mvm_set_tx_cmd(mvm, skb, &tail->frame.tx_cmd, info, 476 mvmsta->sta_id); 477 478 iwl_mvm_set_tx_cmd_rate(mvm, &tail->frame.tx_cmd, info, sta, 479 hdr->frame_control); 480 rcu_read_unlock(); 481 482 memcpy(tail->frame.data, skb->data, skb->len); 483 484 ret = iwl_mvm_send_cmd_pdu(mvm, TDLS_CHANNEL_SWITCH_CMD, 0, len, &cmd); 485 if (ret) { 486 IWL_ERR(mvm, "Failed to send TDLS_CHANNEL_SWITCH cmd: %d\n", 487 ret); 488 goto out; 489 } 490 491 /* channel switch has started, update state */ 492 if (type != TDLS_MOVE_CH) { 493 mvm->tdls_cs.cur_sta_id = mvmsta->sta_id; 494 iwl_mvm_tdls_update_cs_state(mvm, 495 type == TDLS_SEND_CHAN_SW_REQ ? 496 IWL_MVM_TDLS_SW_REQ_SENT : 497 IWL_MVM_TDLS_SW_REQ_RCVD); 498 } else { 499 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_RESP_RCVD); 500 } 501 502 out: 503 504 /* channel switch failed - we are idle */ 505 if (ret) 506 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE); 507 508 return ret; 509 } 510 511 void iwl_mvm_tdls_ch_switch_work(struct work_struct *work) 512 { 513 struct iwl_mvm *mvm; 514 struct ieee80211_sta *sta; 515 struct iwl_mvm_sta *mvmsta; 516 struct ieee80211_vif *vif; 517 unsigned int delay; 518 int ret; 519 520 mvm = container_of(work, struct iwl_mvm, tdls_cs.dwork.work); 521 mutex_lock(&mvm->mutex); 522 523 /* called after an active channel switch has finished or timed-out */ 524 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE); 525 526 /* station might be gone, in that case do nothing */ 527 if (mvm->tdls_cs.peer.sta_id == IWL_MVM_INVALID_STA) 528 goto out; 529 530 sta = rcu_dereference_protected( 531 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id], 532 lockdep_is_held(&mvm->mutex)); 533 /* the station may not be here, but if it is, it must be a TDLS peer */ 534 if (!sta || IS_ERR(sta) || WARN_ON(!sta->tdls)) 535 goto out; 536 537 mvmsta = iwl_mvm_sta_from_mac80211(sta); 538 vif = mvmsta->vif; 539 ret = iwl_mvm_tdls_config_channel_switch(mvm, vif, 540 TDLS_SEND_CHAN_SW_REQ, 541 sta->addr, 542 mvm->tdls_cs.peer.initiator, 543 mvm->tdls_cs.peer.op_class, 544 &mvm->tdls_cs.peer.chandef, 545 0, 0, 0, 546 mvm->tdls_cs.peer.skb, 547 mvm->tdls_cs.peer.ch_sw_tm_ie); 548 if (ret) 549 IWL_ERR(mvm, "Not sending TDLS channel switch: %d\n", ret); 550 551 /* retry after a DTIM if we failed sending now */ 552 delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int); 553 schedule_delayed_work(&mvm->tdls_cs.dwork, msecs_to_jiffies(delay)); 554 out: 555 mutex_unlock(&mvm->mutex); 556 } 557 558 int 559 iwl_mvm_tdls_channel_switch(struct ieee80211_hw *hw, 560 struct ieee80211_vif *vif, 561 struct ieee80211_sta *sta, u8 oper_class, 562 struct cfg80211_chan_def *chandef, 563 struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie) 564 { 565 struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); 566 struct iwl_mvm_sta *mvmsta; 567 unsigned int delay; 568 int ret; 569 570 mutex_lock(&mvm->mutex); 571 572 IWL_DEBUG_TDLS(mvm, "TDLS channel switch with %pM ch %d width %d\n", 573 sta->addr, chandef->chan->center_freq, chandef->width); 574 575 /* we only support a single peer for channel switching */ 576 if (mvm->tdls_cs.peer.sta_id != IWL_MVM_INVALID_STA) { 577 IWL_DEBUG_TDLS(mvm, 578 "Existing peer. Can't start switch with %pM\n", 579 sta->addr); 580 ret = -EBUSY; 581 goto out; 582 } 583 584 ret = iwl_mvm_tdls_config_channel_switch(mvm, vif, 585 TDLS_SEND_CHAN_SW_REQ, 586 sta->addr, sta->tdls_initiator, 587 oper_class, chandef, 0, 0, 0, 588 tmpl_skb, ch_sw_tm_ie); 589 if (ret) 590 goto out; 591 592 /* 593 * Mark the peer as "in tdls switch" for this vif. We only allow a 594 * single such peer per vif. 595 */ 596 mvm->tdls_cs.peer.skb = skb_copy(tmpl_skb, GFP_KERNEL); 597 if (!mvm->tdls_cs.peer.skb) { 598 ret = -ENOMEM; 599 goto out; 600 } 601 602 mvmsta = iwl_mvm_sta_from_mac80211(sta); 603 mvm->tdls_cs.peer.sta_id = mvmsta->sta_id; 604 mvm->tdls_cs.peer.chandef = *chandef; 605 mvm->tdls_cs.peer.initiator = sta->tdls_initiator; 606 mvm->tdls_cs.peer.op_class = oper_class; 607 mvm->tdls_cs.peer.ch_sw_tm_ie = ch_sw_tm_ie; 608 609 /* 610 * Wait for 2 DTIM periods before attempting the next switch. The next 611 * switch will be made sooner if the current one completes before that. 612 */ 613 delay = 2 * TU_TO_MS(vif->bss_conf.dtim_period * 614 vif->bss_conf.beacon_int); 615 mod_delayed_work(system_wq, &mvm->tdls_cs.dwork, 616 msecs_to_jiffies(delay)); 617 618 out: 619 mutex_unlock(&mvm->mutex); 620 return ret; 621 } 622 623 void iwl_mvm_tdls_cancel_channel_switch(struct ieee80211_hw *hw, 624 struct ieee80211_vif *vif, 625 struct ieee80211_sta *sta) 626 { 627 struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); 628 struct ieee80211_sta *cur_sta; 629 bool wait_for_phy = false; 630 631 mutex_lock(&mvm->mutex); 632 633 IWL_DEBUG_TDLS(mvm, "TDLS cancel channel switch with %pM\n", sta->addr); 634 635 /* we only support a single peer for channel switching */ 636 if (mvm->tdls_cs.peer.sta_id == IWL_MVM_INVALID_STA) { 637 IWL_DEBUG_TDLS(mvm, "No ch switch peer - %pM\n", sta->addr); 638 goto out; 639 } 640 641 cur_sta = rcu_dereference_protected( 642 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id], 643 lockdep_is_held(&mvm->mutex)); 644 /* make sure it's the same peer */ 645 if (cur_sta != sta) 646 goto out; 647 648 /* 649 * If we're currently in a switch because of the now canceled peer, 650 * wait a DTIM here to make sure the phy is back on the base channel. 651 * We can't otherwise force it. 652 */ 653 if (mvm->tdls_cs.cur_sta_id == mvm->tdls_cs.peer.sta_id && 654 mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE) 655 wait_for_phy = true; 656 657 mvm->tdls_cs.peer.sta_id = IWL_MVM_INVALID_STA; 658 dev_kfree_skb(mvm->tdls_cs.peer.skb); 659 mvm->tdls_cs.peer.skb = NULL; 660 661 out: 662 mutex_unlock(&mvm->mutex); 663 664 /* make sure the phy is on the base channel */ 665 if (wait_for_phy) 666 msleep(TU_TO_MS(vif->bss_conf.dtim_period * 667 vif->bss_conf.beacon_int)); 668 669 /* flush the channel switch state */ 670 flush_delayed_work(&mvm->tdls_cs.dwork); 671 672 IWL_DEBUG_TDLS(mvm, "TDLS ending channel switch with %pM\n", sta->addr); 673 } 674 675 void 676 iwl_mvm_tdls_recv_channel_switch(struct ieee80211_hw *hw, 677 struct ieee80211_vif *vif, 678 struct ieee80211_tdls_ch_sw_params *params) 679 { 680 struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); 681 enum iwl_tdls_channel_switch_type type; 682 unsigned int delay; 683 const char *action_str = 684 params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ? 685 "REQ" : "RESP"; 686 687 mutex_lock(&mvm->mutex); 688 689 IWL_DEBUG_TDLS(mvm, 690 "Received TDLS ch switch action %s from %pM status %d\n", 691 action_str, params->sta->addr, params->status); 692 693 /* 694 * we got a non-zero status from a peer we were switching to - move to 695 * the idle state and retry again later 696 */ 697 if (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE && 698 params->status != 0 && 699 mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT && 700 mvm->tdls_cs.cur_sta_id != IWL_MVM_INVALID_STA) { 701 struct ieee80211_sta *cur_sta; 702 703 /* make sure it's the same peer */ 704 cur_sta = rcu_dereference_protected( 705 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id], 706 lockdep_is_held(&mvm->mutex)); 707 if (cur_sta == params->sta) { 708 iwl_mvm_tdls_update_cs_state(mvm, 709 IWL_MVM_TDLS_SW_IDLE); 710 goto retry; 711 } 712 } 713 714 type = (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST) ? 715 TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH : TDLS_MOVE_CH; 716 717 iwl_mvm_tdls_config_channel_switch(mvm, vif, type, params->sta->addr, 718 params->sta->tdls_initiator, 0, 719 params->chandef, params->timestamp, 720 params->switch_time, 721 params->switch_timeout, 722 params->tmpl_skb, 723 params->ch_sw_tm_ie); 724 725 retry: 726 /* register a timeout in case we don't succeed in switching */ 727 delay = vif->bss_conf.dtim_period * vif->bss_conf.beacon_int * 728 1024 / 1000; 729 mod_delayed_work(system_wq, &mvm->tdls_cs.dwork, 730 msecs_to_jiffies(delay)); 731 mutex_unlock(&mvm->mutex); 732 } 733