Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/contrib/dev/iwlwifi/mvm/tdls.c
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1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause 2 /* 3 * Copyright (C) 2014 Intel Mobile Communications GmbH 4 * Copyright (C) 2017 Intel Deutschland GmbH 5 * Copyright (C) 2018-2020 Intel Corporation 6 */ 7 #if defined(__FreeBSD__) 8 #include <linux/delay.h> 9 #endif 10 #include <linux/etherdevice.h> 11 #include "mvm.h" 12 #include "time-event.h" 13 #include "iwl-io.h" 14 #include "iwl-prph.h" 15 16 #define TU_TO_US(x) (x * 1024) 17 #define TU_TO_MS(x) (TU_TO_US(x) / 1000) 18 19 void iwl_mvm_teardown_tdls_peers(struct iwl_mvm *mvm) 20 { 21 struct ieee80211_sta *sta; 22 struct iwl_mvm_sta *mvmsta; 23 int i; 24 25 lockdep_assert_held(&mvm->mutex); 26 27 for (i = 0; i < mvm->fw->ucode_capa.num_stations; i++) { 28 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i], 29 lockdep_is_held(&mvm->mutex)); 30 if (!sta || IS_ERR(sta) || !sta->tdls) 31 continue; 32 33 mvmsta = iwl_mvm_sta_from_mac80211(sta); 34 ieee80211_tdls_oper_request(mvmsta->vif, sta->addr, 35 NL80211_TDLS_TEARDOWN, 36 WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED, 37 GFP_KERNEL); 38 } 39 } 40 41 int iwl_mvm_tdls_sta_count(struct iwl_mvm *mvm, struct ieee80211_vif *vif) 42 { 43 struct ieee80211_sta *sta; 44 struct iwl_mvm_sta *mvmsta; 45 int count = 0; 46 int i; 47 48 lockdep_assert_held(&mvm->mutex); 49 50 for (i = 0; i < mvm->fw->ucode_capa.num_stations; i++) { 51 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i], 52 lockdep_is_held(&mvm->mutex)); 53 if (!sta || IS_ERR(sta) || !sta->tdls) 54 continue; 55 56 if (vif) { 57 mvmsta = iwl_mvm_sta_from_mac80211(sta); 58 if (mvmsta->vif != vif) 59 continue; 60 } 61 62 count++; 63 } 64 65 return count; 66 } 67 68 static void iwl_mvm_tdls_config(struct iwl_mvm *mvm, struct ieee80211_vif *vif) 69 { 70 struct iwl_rx_packet *pkt; 71 struct iwl_tdls_config_res *resp; 72 struct iwl_tdls_config_cmd tdls_cfg_cmd = {}; 73 struct iwl_host_cmd cmd = { 74 .id = TDLS_CONFIG_CMD, 75 .flags = CMD_WANT_SKB, 76 .data = { &tdls_cfg_cmd, }, 77 .len = { sizeof(struct iwl_tdls_config_cmd), }, 78 }; 79 struct ieee80211_sta *sta; 80 int ret, i, cnt; 81 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 82 83 lockdep_assert_held(&mvm->mutex); 84 85 tdls_cfg_cmd.id_and_color = 86 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color)); 87 tdls_cfg_cmd.tx_to_ap_tid = IWL_MVM_TDLS_FW_TID; 88 tdls_cfg_cmd.tx_to_ap_ssn = cpu_to_le16(0); /* not used for now */ 89 90 /* for now the Tx cmd is empty and unused */ 91 92 /* populate TDLS peer data */ 93 cnt = 0; 94 for (i = 0; i < mvm->fw->ucode_capa.num_stations; i++) { 95 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i], 96 lockdep_is_held(&mvm->mutex)); 97 if (IS_ERR_OR_NULL(sta) || !sta->tdls) 98 continue; 99 100 tdls_cfg_cmd.sta_info[cnt].sta_id = i; 101 tdls_cfg_cmd.sta_info[cnt].tx_to_peer_tid = 102 IWL_MVM_TDLS_FW_TID; 103 tdls_cfg_cmd.sta_info[cnt].tx_to_peer_ssn = cpu_to_le16(0); 104 tdls_cfg_cmd.sta_info[cnt].is_initiator = 105 cpu_to_le32(sta->tdls_initiator ? 1 : 0); 106 107 cnt++; 108 } 109 110 tdls_cfg_cmd.tdls_peer_count = cnt; 111 IWL_DEBUG_TDLS(mvm, "send TDLS config to FW for %d peers\n", cnt); 112 113 ret = iwl_mvm_send_cmd(mvm, &cmd); 114 if (WARN_ON_ONCE(ret)) 115 return; 116 117 pkt = cmd.resp_pkt; 118 119 WARN_ON_ONCE(iwl_rx_packet_payload_len(pkt) != sizeof(*resp)); 120 121 /* we don't really care about the response at this point */ 122 123 iwl_free_resp(&cmd); 124 } 125 126 void iwl_mvm_recalc_tdls_state(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 127 bool sta_added) 128 { 129 int tdls_sta_cnt = iwl_mvm_tdls_sta_count(mvm, vif); 130 131 /* when the first peer joins, send a power update first */ 132 if (tdls_sta_cnt == 1 && sta_added) 133 iwl_mvm_power_update_mac(mvm); 134 135 /* Configure the FW with TDLS peer info only if TDLS channel switch 136 * capability is set. 137 * TDLS config data is used currently only in TDLS channel switch code. 138 * Supposed to serve also TDLS buffer station which is not implemneted 139 * yet in FW*/ 140 if (fw_has_capa(&mvm->fw->ucode_capa, 141 IWL_UCODE_TLV_CAPA_TDLS_CHANNEL_SWITCH)) 142 iwl_mvm_tdls_config(mvm, vif); 143 144 /* when the last peer leaves, send a power update last */ 145 if (tdls_sta_cnt == 0 && !sta_added) 146 iwl_mvm_power_update_mac(mvm); 147 } 148 149 void iwl_mvm_mac_mgd_protect_tdls_discover(struct ieee80211_hw *hw, 150 struct ieee80211_vif *vif) 151 { 152 struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); 153 u32 duration = 2 * vif->bss_conf.dtim_period * vif->bss_conf.beacon_int; 154 155 /* Protect the session to hear the TDLS setup response on the channel */ 156 mutex_lock(&mvm->mutex); 157 if (fw_has_capa(&mvm->fw->ucode_capa, 158 IWL_UCODE_TLV_CAPA_SESSION_PROT_CMD)) 159 iwl_mvm_schedule_session_protection(mvm, vif, duration, 160 duration, true); 161 else 162 iwl_mvm_protect_session(mvm, vif, duration, 163 duration, 100, true); 164 mutex_unlock(&mvm->mutex); 165 } 166 167 static const char * 168 iwl_mvm_tdls_cs_state_str(enum iwl_mvm_tdls_cs_state state) 169 { 170 switch (state) { 171 case IWL_MVM_TDLS_SW_IDLE: 172 return "IDLE"; 173 case IWL_MVM_TDLS_SW_REQ_SENT: 174 return "REQ SENT"; 175 case IWL_MVM_TDLS_SW_RESP_RCVD: 176 return "RESP RECEIVED"; 177 case IWL_MVM_TDLS_SW_REQ_RCVD: 178 return "REQ RECEIVED"; 179 case IWL_MVM_TDLS_SW_ACTIVE: 180 return "ACTIVE"; 181 } 182 183 return NULL; 184 } 185 186 static void iwl_mvm_tdls_update_cs_state(struct iwl_mvm *mvm, 187 enum iwl_mvm_tdls_cs_state state) 188 { 189 if (mvm->tdls_cs.state == state) 190 return; 191 192 IWL_DEBUG_TDLS(mvm, "TDLS channel switch state: %s -> %s\n", 193 iwl_mvm_tdls_cs_state_str(mvm->tdls_cs.state), 194 iwl_mvm_tdls_cs_state_str(state)); 195 mvm->tdls_cs.state = state; 196 197 /* we only send requests to our switching peer - update sent time */ 198 if (state == IWL_MVM_TDLS_SW_REQ_SENT) 199 mvm->tdls_cs.peer.sent_timestamp = iwl_mvm_get_systime(mvm); 200 201 if (state == IWL_MVM_TDLS_SW_IDLE) 202 mvm->tdls_cs.cur_sta_id = IWL_MVM_INVALID_STA; 203 } 204 205 void iwl_mvm_rx_tdls_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb) 206 { 207 struct iwl_rx_packet *pkt = rxb_addr(rxb); 208 struct iwl_tdls_channel_switch_notif *notif = (void *)pkt->data; 209 struct ieee80211_sta *sta; 210 unsigned int delay; 211 struct iwl_mvm_sta *mvmsta; 212 struct ieee80211_vif *vif; 213 u32 sta_id = le32_to_cpu(notif->sta_id); 214 215 lockdep_assert_held(&mvm->mutex); 216 217 /* can fail sometimes */ 218 if (!le32_to_cpu(notif->status)) { 219 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE); 220 return; 221 } 222 223 if (WARN_ON(sta_id >= mvm->fw->ucode_capa.num_stations)) 224 return; 225 226 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id], 227 lockdep_is_held(&mvm->mutex)); 228 /* the station may not be here, but if it is, it must be a TDLS peer */ 229 if (IS_ERR_OR_NULL(sta) || WARN_ON(!sta->tdls)) 230 return; 231 232 mvmsta = iwl_mvm_sta_from_mac80211(sta); 233 vif = mvmsta->vif; 234 235 /* 236 * Update state and possibly switch again after this is over (DTIM). 237 * Also convert TU to msec. 238 */ 239 delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int); 240 mod_delayed_work(system_wq, &mvm->tdls_cs.dwork, 241 msecs_to_jiffies(delay)); 242 243 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_ACTIVE); 244 } 245 246 static int 247 iwl_mvm_tdls_check_action(struct iwl_mvm *mvm, 248 enum iwl_tdls_channel_switch_type type, 249 const u8 *peer, bool peer_initiator, u32 timestamp) 250 { 251 bool same_peer = false; 252 int ret = 0; 253 254 /* get the existing peer if it's there */ 255 if (mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE && 256 mvm->tdls_cs.cur_sta_id != IWL_MVM_INVALID_STA) { 257 struct ieee80211_sta *sta = rcu_dereference_protected( 258 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id], 259 lockdep_is_held(&mvm->mutex)); 260 if (!IS_ERR_OR_NULL(sta)) 261 same_peer = ether_addr_equal(peer, sta->addr); 262 } 263 264 switch (mvm->tdls_cs.state) { 265 case IWL_MVM_TDLS_SW_IDLE: 266 /* 267 * might be spurious packet from the peer after the switch is 268 * already done 269 */ 270 if (type == TDLS_MOVE_CH) 271 ret = -EINVAL; 272 break; 273 case IWL_MVM_TDLS_SW_REQ_SENT: 274 /* only allow requests from the same peer */ 275 if (!same_peer) 276 ret = -EBUSY; 277 else if (type == TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH && 278 !peer_initiator) 279 /* 280 * We received a ch-switch request while an outgoing 281 * one is pending. Allow it if the peer is the link 282 * initiator. 283 */ 284 ret = -EBUSY; 285 else if (type == TDLS_SEND_CHAN_SW_REQ) 286 /* wait for idle before sending another request */ 287 ret = -EBUSY; 288 else if (timestamp <= mvm->tdls_cs.peer.sent_timestamp) 289 /* we got a stale response - ignore it */ 290 ret = -EINVAL; 291 break; 292 case IWL_MVM_TDLS_SW_RESP_RCVD: 293 /* 294 * we are waiting for the FW to give an "active" notification, 295 * so ignore requests in the meantime 296 */ 297 ret = -EBUSY; 298 break; 299 case IWL_MVM_TDLS_SW_REQ_RCVD: 300 /* as above, allow the link initiator to proceed */ 301 if (type == TDLS_SEND_CHAN_SW_REQ) { 302 if (!same_peer) 303 ret = -EBUSY; 304 else if (peer_initiator) /* they are the initiator */ 305 ret = -EBUSY; 306 } else if (type == TDLS_MOVE_CH) { 307 ret = -EINVAL; 308 } 309 break; 310 case IWL_MVM_TDLS_SW_ACTIVE: 311 /* 312 * the only valid request when active is a request to return 313 * to the base channel by the current off-channel peer 314 */ 315 if (type != TDLS_MOVE_CH || !same_peer) 316 ret = -EBUSY; 317 break; 318 } 319 320 if (ret) 321 IWL_DEBUG_TDLS(mvm, 322 "Invalid TDLS action %d state %d peer %pM same_peer %d initiator %d\n", 323 type, mvm->tdls_cs.state, peer, same_peer, 324 peer_initiator); 325 326 return ret; 327 } 328 329 static int 330 iwl_mvm_tdls_config_channel_switch(struct iwl_mvm *mvm, 331 struct ieee80211_vif *vif, 332 enum iwl_tdls_channel_switch_type type, 333 const u8 *peer, bool peer_initiator, 334 u8 oper_class, 335 struct cfg80211_chan_def *chandef, 336 u32 timestamp, u16 switch_time, 337 u16 switch_timeout, struct sk_buff *skb, 338 u32 ch_sw_tm_ie) 339 { 340 struct ieee80211_sta *sta; 341 struct iwl_mvm_sta *mvmsta; 342 struct ieee80211_tx_info *info; 343 struct ieee80211_hdr *hdr; 344 struct iwl_tdls_channel_switch_cmd cmd = {0}; 345 struct iwl_tdls_channel_switch_cmd_tail *tail = 346 iwl_mvm_chan_info_cmd_tail(mvm, &cmd.ci); 347 u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm); 348 int ret; 349 350 lockdep_assert_held(&mvm->mutex); 351 352 ret = iwl_mvm_tdls_check_action(mvm, type, peer, peer_initiator, 353 timestamp); 354 if (ret) 355 return ret; 356 357 if (!skb || WARN_ON(skb->len > IWL_TDLS_CH_SW_FRAME_MAX_SIZE)) { 358 ret = -EINVAL; 359 goto out; 360 } 361 362 cmd.switch_type = type; 363 tail->timing.frame_timestamp = cpu_to_le32(timestamp); 364 tail->timing.switch_time = cpu_to_le32(switch_time); 365 tail->timing.switch_timeout = cpu_to_le32(switch_timeout); 366 367 rcu_read_lock(); 368 sta = ieee80211_find_sta(vif, peer); 369 if (!sta) { 370 rcu_read_unlock(); 371 ret = -ENOENT; 372 goto out; 373 } 374 mvmsta = iwl_mvm_sta_from_mac80211(sta); 375 cmd.peer_sta_id = cpu_to_le32(mvmsta->sta_id); 376 377 if (!chandef) { 378 if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT && 379 mvm->tdls_cs.peer.chandef.chan) { 380 /* actually moving to the channel */ 381 chandef = &mvm->tdls_cs.peer.chandef; 382 } else if (mvm->tdls_cs.state == IWL_MVM_TDLS_SW_ACTIVE && 383 type == TDLS_MOVE_CH) { 384 /* we need to return to base channel */ 385 struct ieee80211_chanctx_conf *chanctx = 386 rcu_dereference(vif->chanctx_conf); 387 388 if (WARN_ON_ONCE(!chanctx)) { 389 rcu_read_unlock(); 390 goto out; 391 } 392 393 chandef = &chanctx->def; 394 } 395 } 396 397 if (chandef) 398 iwl_mvm_set_chan_info_chandef(mvm, &cmd.ci, chandef); 399 400 /* keep quota calculation simple for now - 50% of DTIM for TDLS */ 401 tail->timing.max_offchan_duration = 402 cpu_to_le32(TU_TO_US(vif->bss_conf.dtim_period * 403 vif->bss_conf.beacon_int) / 2); 404 405 /* Switch time is the first element in the switch-timing IE. */ 406 tail->frame.switch_time_offset = cpu_to_le32(ch_sw_tm_ie + 2); 407 408 info = IEEE80211_SKB_CB(skb); 409 hdr = (void *)skb->data; 410 if (info->control.hw_key) { 411 if (info->control.hw_key->cipher != WLAN_CIPHER_SUITE_CCMP) { 412 rcu_read_unlock(); 413 ret = -EINVAL; 414 goto out; 415 } 416 iwl_mvm_set_tx_cmd_ccmp(info, &tail->frame.tx_cmd); 417 } 418 419 iwl_mvm_set_tx_cmd(mvm, skb, &tail->frame.tx_cmd, info, 420 mvmsta->sta_id); 421 422 iwl_mvm_set_tx_cmd_rate(mvm, &tail->frame.tx_cmd, info, sta, 423 hdr->frame_control); 424 rcu_read_unlock(); 425 426 memcpy(tail->frame.data, skb->data, skb->len); 427 428 ret = iwl_mvm_send_cmd_pdu(mvm, TDLS_CHANNEL_SWITCH_CMD, 0, len, &cmd); 429 if (ret) { 430 IWL_ERR(mvm, "Failed to send TDLS_CHANNEL_SWITCH cmd: %d\n", 431 ret); 432 goto out; 433 } 434 435 /* channel switch has started, update state */ 436 if (type != TDLS_MOVE_CH) { 437 mvm->tdls_cs.cur_sta_id = mvmsta->sta_id; 438 iwl_mvm_tdls_update_cs_state(mvm, 439 type == TDLS_SEND_CHAN_SW_REQ ? 440 IWL_MVM_TDLS_SW_REQ_SENT : 441 IWL_MVM_TDLS_SW_REQ_RCVD); 442 } else { 443 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_RESP_RCVD); 444 } 445 446 out: 447 448 /* channel switch failed - we are idle */ 449 if (ret) 450 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE); 451 452 return ret; 453 } 454 455 void iwl_mvm_tdls_ch_switch_work(struct work_struct *work) 456 { 457 struct iwl_mvm *mvm; 458 struct ieee80211_sta *sta; 459 struct iwl_mvm_sta *mvmsta; 460 struct ieee80211_vif *vif; 461 unsigned int delay; 462 int ret; 463 464 mvm = container_of(work, struct iwl_mvm, tdls_cs.dwork.work); 465 mutex_lock(&mvm->mutex); 466 467 /* called after an active channel switch has finished or timed-out */ 468 iwl_mvm_tdls_update_cs_state(mvm, IWL_MVM_TDLS_SW_IDLE); 469 470 /* station might be gone, in that case do nothing */ 471 if (mvm->tdls_cs.peer.sta_id == IWL_MVM_INVALID_STA) 472 goto out; 473 474 sta = rcu_dereference_protected( 475 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id], 476 lockdep_is_held(&mvm->mutex)); 477 /* the station may not be here, but if it is, it must be a TDLS peer */ 478 if (!sta || IS_ERR(sta) || WARN_ON(!sta->tdls)) 479 goto out; 480 481 mvmsta = iwl_mvm_sta_from_mac80211(sta); 482 vif = mvmsta->vif; 483 ret = iwl_mvm_tdls_config_channel_switch(mvm, vif, 484 TDLS_SEND_CHAN_SW_REQ, 485 sta->addr, 486 mvm->tdls_cs.peer.initiator, 487 mvm->tdls_cs.peer.op_class, 488 &mvm->tdls_cs.peer.chandef, 489 0, 0, 0, 490 mvm->tdls_cs.peer.skb, 491 mvm->tdls_cs.peer.ch_sw_tm_ie); 492 if (ret) 493 IWL_ERR(mvm, "Not sending TDLS channel switch: %d\n", ret); 494 495 /* retry after a DTIM if we failed sending now */ 496 delay = TU_TO_MS(vif->bss_conf.dtim_period * vif->bss_conf.beacon_int); 497 schedule_delayed_work(&mvm->tdls_cs.dwork, msecs_to_jiffies(delay)); 498 out: 499 mutex_unlock(&mvm->mutex); 500 } 501 502 int 503 iwl_mvm_tdls_channel_switch(struct ieee80211_hw *hw, 504 struct ieee80211_vif *vif, 505 struct ieee80211_sta *sta, u8 oper_class, 506 struct cfg80211_chan_def *chandef, 507 struct sk_buff *tmpl_skb, u32 ch_sw_tm_ie) 508 { 509 struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); 510 struct iwl_mvm_sta *mvmsta; 511 unsigned int delay; 512 int ret; 513 514 mutex_lock(&mvm->mutex); 515 516 IWL_DEBUG_TDLS(mvm, "TDLS channel switch with %pM ch %d width %d\n", 517 sta->addr, chandef->chan->center_freq, chandef->width); 518 519 /* we only support a single peer for channel switching */ 520 if (mvm->tdls_cs.peer.sta_id != IWL_MVM_INVALID_STA) { 521 IWL_DEBUG_TDLS(mvm, 522 "Existing peer. Can't start switch with %pM\n", 523 sta->addr); 524 ret = -EBUSY; 525 goto out; 526 } 527 528 ret = iwl_mvm_tdls_config_channel_switch(mvm, vif, 529 TDLS_SEND_CHAN_SW_REQ, 530 sta->addr, sta->tdls_initiator, 531 oper_class, chandef, 0, 0, 0, 532 tmpl_skb, ch_sw_tm_ie); 533 if (ret) 534 goto out; 535 536 /* 537 * Mark the peer as "in tdls switch" for this vif. We only allow a 538 * single such peer per vif. 539 */ 540 mvm->tdls_cs.peer.skb = skb_copy(tmpl_skb, GFP_KERNEL); 541 if (!mvm->tdls_cs.peer.skb) { 542 ret = -ENOMEM; 543 goto out; 544 } 545 546 mvmsta = iwl_mvm_sta_from_mac80211(sta); 547 mvm->tdls_cs.peer.sta_id = mvmsta->sta_id; 548 mvm->tdls_cs.peer.chandef = *chandef; 549 mvm->tdls_cs.peer.initiator = sta->tdls_initiator; 550 mvm->tdls_cs.peer.op_class = oper_class; 551 mvm->tdls_cs.peer.ch_sw_tm_ie = ch_sw_tm_ie; 552 553 /* 554 * Wait for 2 DTIM periods before attempting the next switch. The next 555 * switch will be made sooner if the current one completes before that. 556 */ 557 delay = 2 * TU_TO_MS(vif->bss_conf.dtim_period * 558 vif->bss_conf.beacon_int); 559 mod_delayed_work(system_wq, &mvm->tdls_cs.dwork, 560 msecs_to_jiffies(delay)); 561 562 out: 563 mutex_unlock(&mvm->mutex); 564 return ret; 565 } 566 567 void iwl_mvm_tdls_cancel_channel_switch(struct ieee80211_hw *hw, 568 struct ieee80211_vif *vif, 569 struct ieee80211_sta *sta) 570 { 571 struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); 572 struct ieee80211_sta *cur_sta; 573 bool wait_for_phy = false; 574 575 mutex_lock(&mvm->mutex); 576 577 IWL_DEBUG_TDLS(mvm, "TDLS cancel channel switch with %pM\n", sta->addr); 578 579 /* we only support a single peer for channel switching */ 580 if (mvm->tdls_cs.peer.sta_id == IWL_MVM_INVALID_STA) { 581 IWL_DEBUG_TDLS(mvm, "No ch switch peer - %pM\n", sta->addr); 582 goto out; 583 } 584 585 cur_sta = rcu_dereference_protected( 586 mvm->fw_id_to_mac_id[mvm->tdls_cs.peer.sta_id], 587 lockdep_is_held(&mvm->mutex)); 588 /* make sure it's the same peer */ 589 if (cur_sta != sta) 590 goto out; 591 592 /* 593 * If we're currently in a switch because of the now canceled peer, 594 * wait a DTIM here to make sure the phy is back on the base channel. 595 * We can't otherwise force it. 596 */ 597 if (mvm->tdls_cs.cur_sta_id == mvm->tdls_cs.peer.sta_id && 598 mvm->tdls_cs.state != IWL_MVM_TDLS_SW_IDLE) 599 wait_for_phy = true; 600 601 mvm->tdls_cs.peer.sta_id = IWL_MVM_INVALID_STA; 602 dev_kfree_skb(mvm->tdls_cs.peer.skb); 603 mvm->tdls_cs.peer.skb = NULL; 604 605 out: 606 mutex_unlock(&mvm->mutex); 607 608 /* make sure the phy is on the base channel */ 609 if (wait_for_phy) 610 #if defined(__linux__) 611 msleep(TU_TO_MS(vif->bss_conf.dtim_period * 612 #elif defined(__FreeBSD__) 613 linux_msleep(TU_TO_MS(vif->bss_conf.dtim_period * 614 #endif 615 vif->bss_conf.beacon_int)); 616 617 /* flush the channel switch state */ 618 flush_delayed_work(&mvm->tdls_cs.dwork); 619 620 IWL_DEBUG_TDLS(mvm, "TDLS ending channel switch with %pM\n", sta->addr); 621 } 622 623 void 624 iwl_mvm_tdls_recv_channel_switch(struct ieee80211_hw *hw, 625 struct ieee80211_vif *vif, 626 struct ieee80211_tdls_ch_sw_params *params) 627 { 628 struct iwl_mvm *mvm = IWL_MAC80211_GET_MVM(hw); 629 enum iwl_tdls_channel_switch_type type; 630 unsigned int delay; 631 const char *action_str = 632 params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST ? 633 "REQ" : "RESP"; 634 635 mutex_lock(&mvm->mutex); 636 637 IWL_DEBUG_TDLS(mvm, 638 "Received TDLS ch switch action %s from %pM status %d\n", 639 action_str, params->sta->addr, params->status); 640 641 /* 642 * we got a non-zero status from a peer we were switching to - move to 643 * the idle state and retry again later 644 */ 645 if (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE && 646 params->status != 0 && 647 mvm->tdls_cs.state == IWL_MVM_TDLS_SW_REQ_SENT && 648 mvm->tdls_cs.cur_sta_id != IWL_MVM_INVALID_STA) { 649 struct ieee80211_sta *cur_sta; 650 651 /* make sure it's the same peer */ 652 cur_sta = rcu_dereference_protected( 653 mvm->fw_id_to_mac_id[mvm->tdls_cs.cur_sta_id], 654 lockdep_is_held(&mvm->mutex)); 655 if (cur_sta == params->sta) { 656 iwl_mvm_tdls_update_cs_state(mvm, 657 IWL_MVM_TDLS_SW_IDLE); 658 goto retry; 659 } 660 } 661 662 type = (params->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST) ? 663 TDLS_SEND_CHAN_SW_RESP_AND_MOVE_CH : TDLS_MOVE_CH; 664 665 iwl_mvm_tdls_config_channel_switch(mvm, vif, type, params->sta->addr, 666 params->sta->tdls_initiator, 0, 667 params->chandef, params->timestamp, 668 params->switch_time, 669 params->switch_timeout, 670 params->tmpl_skb, 671 params->ch_sw_tm_ie); 672 673 retry: 674 /* register a timeout in case we don't succeed in switching */ 675 delay = vif->bss_conf.dtim_period * vif->bss_conf.beacon_int * 676 1024 / 1000; 677 mod_delayed_work(system_wq, &mvm->tdls_cs.dwork, 678 msecs_to_jiffies(delay)); 679 mutex_unlock(&mvm->mutex); 680 }
Cache object: 1ed041d1b3e9b8bf2882796421564826
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