net/mac80211/offchannel.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Off-channel operation helpers
   4  *
   5  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
   6  * Copyright 2004, Instant802 Networks, Inc.
   7  * Copyright 2005, Devicescape Software, Inc.
   8  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   9  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
  10  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
  11  * Copyright (C) 2019, 2022 Intel Corporation
  12  */
  13 #include <linux/export.h>
  14 #include <net/mac80211.h>
  15 #include "ieee80211_i.h"
  16 #include "driver-ops.h"
  17
  18 /*
  19  * Tell our hardware to disable PS.
  20  * Optionally inform AP that we will go to sleep so that it will buffer
  21  * the frames while we are doing off-channel work.  This is optional
  22  * because we *may* be doing work on-operating channel, and want our
  23  * hardware unconditionally awake, but still let the AP send us normal frames.
  24  */
  25 static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata)
  26 {
  27         struct ieee80211_local *local = sdata->local;
  28         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
  29         bool offchannel_ps_enabled = false;
  30
  31         /* FIXME: what to do when local->pspolling is true? */
  32
  33         del_timer_sync(&local->dynamic_ps_timer);
  34         del_timer_sync(&ifmgd->bcn_mon_timer);
  35         del_timer_sync(&ifmgd->conn_mon_timer);
  36
  37         cancel_work_sync(&local->dynamic_ps_enable_work);
  38
  39         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
  40                 offchannel_ps_enabled = true;
  41                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
  42                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
  43         }
  44
  45         if (!offchannel_ps_enabled ||
  46             !ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
  47                 /*
  48                  * If power save was enabled, no need to send a nullfunc
  49                  * frame because AP knows that we are sleeping. But if the
  50                  * hardware is creating the nullfunc frame for power save
  51                  * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not
  52                  * enabled) and power save was enabled, the firmware just
  53                  * sent a null frame with power save disabled. So we need
  54                  * to send a new nullfunc frame to inform the AP that we
  55                  * are again sleeping.
  56                  */
  57                 ieee80211_send_nullfunc(local, sdata, true);
  58 }
  59
  60 /* inform AP that we are awake again */
  61 static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata)
  62 {
  63         struct ieee80211_local *local = sdata->local;
  64
  65         if (!local->ps_sdata)
  66                 ieee80211_send_nullfunc(local, sdata, false);
  67         else if (local->hw.conf.dynamic_ps_timeout > 0) {
  68                 /*
  69                  * the dynamic_ps_timer had been running before leaving the
  70                  * operating channel, restart the timer now and send a nullfunc
  71                  * frame to inform the AP that we are awake so that AP sends
  72                  * the buffered packets (if any).
  73                  */
  74                 ieee80211_send_nullfunc(local, sdata, false);
  75                 mod_timer(&local->dynamic_ps_timer, jiffies +
  76                           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
  77         }
  78
  79         ieee80211_sta_reset_beacon_monitor(sdata);
  80         ieee80211_sta_reset_conn_monitor(sdata);
  81 }
  82
  83 void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local)
  84 {
  85         struct ieee80211_sub_if_data *sdata;
  86
  87         if (WARN_ON(local->use_chanctx))
  88                 return;
  89
  90         /*
  91          * notify the AP about us leaving the channel and stop all
  92          * STA interfaces.
  93          */
  94
  95         /*
  96          * Stop queues and transmit all frames queued by the driver
  97          * before sending nullfunc to enable powersave at the AP.
  98          */
  99         ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 100                                         IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL,
 101                                         false);
 102         ieee80211_flush_queues(local, NULL, false);
 103
 104         mutex_lock(&local->iflist_mtx);
 105         list_for_each_entry(sdata, &local->interfaces, list) {
 106                 if (!ieee80211_sdata_running(sdata))
 107                         continue;
 108
 109                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE ||
 110                     sdata->vif.type == NL80211_IFTYPE_NAN)
 111                         continue;
 112
 113                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 114                         set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
 115
 116                 /* Check to see if we should disable beaconing. */
 117                 if (sdata->vif.bss_conf.enable_beacon) {
 118                         set_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
 119                                 &sdata->state);
 120                         sdata->vif.bss_conf.enable_beacon = false;
 121                         ieee80211_link_info_change_notify(
 122                                 sdata, &sdata->deflink,
 123                                 BSS_CHANGED_BEACON_ENABLED);
 124                 }
 125
 126                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 127                     sdata->u.mgd.associated)
 128                         ieee80211_offchannel_ps_enable(sdata);
 129         }
 130         mutex_unlock(&local->iflist_mtx);
 131 }
 132
 133 void ieee80211_offchannel_return(struct ieee80211_local *local)
 134 {
 135         struct ieee80211_sub_if_data *sdata;
 136
 137         if (WARN_ON(local->use_chanctx))
 138                 return;
 139
 140         mutex_lock(&local->iflist_mtx);
 141         list_for_each_entry(sdata, &local->interfaces, list) {
 142                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
 143                         continue;
 144
 145                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 146                         clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
 147
 148                 if (!ieee80211_sdata_running(sdata))
 149                         continue;
 150
 151                 /* Tell AP we're back */
 152                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 153                     sdata->u.mgd.associated)
 154                         ieee80211_offchannel_ps_disable(sdata);
 155
 156                 if (test_and_clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
 157                                        &sdata->state)) {
 158                         sdata->vif.bss_conf.enable_beacon = true;
 159                         ieee80211_link_info_change_notify(
 160                                 sdata, &sdata->deflink,
 161                                 BSS_CHANGED_BEACON_ENABLED);
 162                 }
 163         }
 164         mutex_unlock(&local->iflist_mtx);
 165
 166         ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 167                                         IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL,
 168                                         false);
 169 }
 170
 171 static void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc)
 172 {
 173         /* was never transmitted */
 174         if (roc->frame) {
 175                 cfg80211_mgmt_tx_status(&roc->sdata->wdev, roc->mgmt_tx_cookie,
 176                                         roc->frame->data, roc->frame->len,
 177                                         false, GFP_KERNEL);
 178                 ieee80211_free_txskb(&roc->sdata->local->hw, roc->frame);
 179         }
 180
 181         if (!roc->mgmt_tx_cookie)
 182                 cfg80211_remain_on_channel_expired(&roc->sdata->wdev,
 183                                                    roc->cookie, roc->chan,
 184                                                    GFP_KERNEL);
 185         else
 186                 cfg80211_tx_mgmt_expired(&roc->sdata->wdev,
 187                                          roc->mgmt_tx_cookie,
 188                                          roc->chan, GFP_KERNEL);
 189
 190         list_del(&roc->list);
 191         kfree(roc);
 192 }
 193
 194 static unsigned long ieee80211_end_finished_rocs(struct ieee80211_local *local,
 195                                                  unsigned long now)
 196 {
 197         struct ieee80211_roc_work *roc, *tmp;
 198         long remaining_dur_min = LONG_MAX;
 199
 200         lockdep_assert_held(&local->mtx);
 201
 202         list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
 203                 long remaining;
 204
 205                 if (!roc->started)
 206                         break;
 207
 208                 remaining = roc->start_time +
 209                             msecs_to_jiffies(roc->duration) -
 210                             now;
 211
 212                 /* In case of HW ROC, it is possible that the HW finished the
 213                  * ROC session before the actual requested time. In such a case
 214                  * end the ROC session (disregarding the remaining time).
 215                  */
 216                 if (roc->abort || roc->hw_begun || remaining <= 0)
 217                         ieee80211_roc_notify_destroy(roc);
 218                 else
 219                         remaining_dur_min = min(remaining_dur_min, remaining);
 220         }
 221
 222         return remaining_dur_min;
 223 }
 224
 225 static bool ieee80211_recalc_sw_work(struct ieee80211_local *local,
 226                                      unsigned long now)
 227 {
 228         long dur = ieee80211_end_finished_rocs(local, now);
 229
 230         if (dur == LONG_MAX)
 231                 return false;
 232
 233         mod_delayed_work(local->workqueue, &local->roc_work, dur);
 234         return true;
 235 }
 236
 237 static void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc,
 238                                          unsigned long start_time)
 239 {
 240         if (WARN_ON(roc->notified))
 241                 return;
 242
 243         roc->start_time = start_time;
 244         roc->started = true;
 245
 246         if (roc->mgmt_tx_cookie) {
 247                 if (!WARN_ON(!roc->frame)) {
 248                         ieee80211_tx_skb_tid_band(roc->sdata, roc->frame, 7,
 249                                                   roc->chan->band);
 250                         roc->frame = NULL;
 251                 }
 252         } else {
 253                 cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie,
 254                                           roc->chan, roc->req_duration,
 255                                           GFP_KERNEL);
 256         }
 257
 258         roc->notified = true;
 259 }
 260
 261 static void ieee80211_hw_roc_start(struct work_struct *work)
 262 {
 263         struct ieee80211_local *local =
 264                 container_of(work, struct ieee80211_local, hw_roc_start);
 265         struct ieee80211_roc_work *roc;
 266
 267         mutex_lock(&local->mtx);
 268
 269         list_for_each_entry(roc, &local->roc_list, list) {
 270                 if (!roc->started)
 271                         break;
 272
 273                 roc->hw_begun = true;
 274                 ieee80211_handle_roc_started(roc, local->hw_roc_start_time);
 275         }
 276
 277         mutex_unlock(&local->mtx);
 278 }
 279
 280 void ieee80211_ready_on_channel(struct ieee80211_hw *hw)
 281 {
 282         struct ieee80211_local *local = hw_to_local(hw);
 283
 284         local->hw_roc_start_time = jiffies;
 285
 286         trace_api_ready_on_channel(local);
 287
 288         ieee80211_queue_work(hw, &local->hw_roc_start);
 289 }
 290 EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel);
 291
 292 static void _ieee80211_start_next_roc(struct ieee80211_local *local)
 293 {
 294         struct ieee80211_roc_work *roc, *tmp;
 295         enum ieee80211_roc_type type;
 296         u32 min_dur, max_dur;
 297
 298         lockdep_assert_held(&local->mtx);
 299
 300         if (WARN_ON(list_empty(&local->roc_list)))
 301                 return;
 302
 303         roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
 304                                list);
 305
 306         if (WARN_ON(roc->started))
 307                 return;
 308
 309         min_dur = roc->duration;
 310         max_dur = roc->duration;
 311         type = roc->type;
 312
 313         list_for_each_entry(tmp, &local->roc_list, list) {
 314                 if (tmp == roc)
 315                         continue;
 316                 if (tmp->sdata != roc->sdata || tmp->chan != roc->chan)
 317                         break;
 318                 max_dur = max(tmp->duration, max_dur);
 319                 min_dur = min(tmp->duration, min_dur);
 320                 type = max(tmp->type, type);
 321         }
 322
 323         if (local->ops->remain_on_channel) {
 324                 int ret = drv_remain_on_channel(local, roc->sdata, roc->chan,
 325                                                 max_dur, type);
 326
 327                 if (ret) {
 328                         wiphy_warn(local->hw.wiphy,
 329                                    "failed to start next HW ROC (%d)\n", ret);
 330                         /*
 331                          * queue the work struct again to avoid recursion
 332                          * when multiple failures occur
 333                          */
 334                         list_for_each_entry(tmp, &local->roc_list, list) {
 335                                 if (tmp->sdata != roc->sdata ||
 336                                     tmp->chan != roc->chan)
 337                                         break;
 338                                 tmp->started = true;
 339                                 tmp->abort = true;
 340                         }
 341                         ieee80211_queue_work(&local->hw, &local->hw_roc_done);
 342                         return;
 343                 }
 344
 345                 /* we'll notify about the start once the HW calls back */
 346                 list_for_each_entry(tmp, &local->roc_list, list) {
 347                         if (tmp->sdata != roc->sdata || tmp->chan != roc->chan)
 348                                 break;
 349                         tmp->started = true;
 350                 }
 351         } else {
 352                 /* If actually operating on the desired channel (with at least
 353                  * 20 MHz channel width) don't stop all the operations but still
 354                  * treat it as though the ROC operation started properly, so
 355                  * other ROC operations won't interfere with this one.
 356                  */
 357                 roc->on_channel = roc->chan == local->_oper_chandef.chan &&
 358                                   local->_oper_chandef.width != NL80211_CHAN_WIDTH_5 &&
 359                                   local->_oper_chandef.width != NL80211_CHAN_WIDTH_10;
 360
 361                 /* start this ROC */
 362                 ieee80211_recalc_idle(local);
 363
 364                 if (!roc->on_channel) {
 365                         ieee80211_offchannel_stop_vifs(local);
 366
 367                         local->tmp_channel = roc->chan;
 368                         ieee80211_hw_config(local, 0);
 369                 }
 370
 371                 ieee80211_queue_delayed_work(&local->hw, &local->roc_work,
 372                                              msecs_to_jiffies(min_dur));
 373
 374                 /* tell userspace or send frame(s) */
 375                 list_for_each_entry(tmp, &local->roc_list, list) {
 376                         if (tmp->sdata != roc->sdata || tmp->chan != roc->chan)
 377                                 break;
 378
 379                         tmp->on_channel = roc->on_channel;
 380                         ieee80211_handle_roc_started(tmp, jiffies);
 381                 }
 382         }
 383 }
 384
 385 void ieee80211_start_next_roc(struct ieee80211_local *local)
 386 {
 387         struct ieee80211_roc_work *roc;
 388
 389         lockdep_assert_held(&local->mtx);
 390
 391         if (list_empty(&local->roc_list)) {
 392                 ieee80211_run_deferred_scan(local);
 393                 return;
 394         }
 395
 396         /* defer roc if driver is not started (i.e. during reconfig) */
 397         if (local->in_reconfig)
 398                 return;
 399
 400         roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
 401                                list);
 402
 403         if (WARN_ON_ONCE(roc->started))
 404                 return;
 405
 406         if (local->ops->remain_on_channel) {
 407                 _ieee80211_start_next_roc(local);
 408         } else {
 409                 /* delay it a bit */
 410                 ieee80211_queue_delayed_work(&local->hw, &local->roc_work,
 411                                              round_jiffies_relative(HZ/2));
 412         }
 413 }
 414
 415 static void __ieee80211_roc_work(struct ieee80211_local *local)
 416 {
 417         struct ieee80211_roc_work *roc;
 418         bool on_channel;
 419
 420         lockdep_assert_held(&local->mtx);
 421
 422         if (WARN_ON(local->ops->remain_on_channel))
 423                 return;
 424
 425         roc = list_first_entry_or_null(&local->roc_list,
 426                                        struct ieee80211_roc_work, list);
 427         if (!roc)
 428                 return;
 429
 430         if (!roc->started) {
 431                 WARN_ON(local->use_chanctx);
 432                 _ieee80211_start_next_roc(local);
 433         } else {
 434                 on_channel = roc->on_channel;
 435                 if (ieee80211_recalc_sw_work(local, jiffies))
 436                         return;
 437
 438                 /* careful - roc pointer became invalid during recalc */
 439
 440                 if (!on_channel) {
 441                         ieee80211_flush_queues(local, NULL, false);
 442
 443                         local->tmp_channel = NULL;
 444                         ieee80211_hw_config(local, 0);
 445
 446                         ieee80211_offchannel_return(local);
 447                 }
 448
 449                 ieee80211_recalc_idle(local);
 450                 ieee80211_start_next_roc(local);
 451         }
 452 }
 453
 454 static void ieee80211_roc_work(struct work_struct *work)
 455 {
 456         struct ieee80211_local *local =
 457                 container_of(work, struct ieee80211_local, roc_work.work);
 458
 459         mutex_lock(&local->mtx);
 460         __ieee80211_roc_work(local);
 461         mutex_unlock(&local->mtx);
 462 }
 463
 464 static void ieee80211_hw_roc_done(struct work_struct *work)
 465 {
 466         struct ieee80211_local *local =
 467                 container_of(work, struct ieee80211_local, hw_roc_done);
 468
 469         mutex_lock(&local->mtx);
 470
 471         ieee80211_end_finished_rocs(local, jiffies);
 472
 473         /* if there's another roc, start it now */
 474         ieee80211_start_next_roc(local);
 475
 476         mutex_unlock(&local->mtx);
 477 }
 478
 479 void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
 480 {
 481         struct ieee80211_local *local = hw_to_local(hw);
 482
 483         trace_api_remain_on_channel_expired(local);
 484
 485         ieee80211_queue_work(hw, &local->hw_roc_done);
 486 }
 487 EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
 488
 489 static bool
 490 ieee80211_coalesce_hw_started_roc(struct ieee80211_local *local,
 491                                   struct ieee80211_roc_work *new_roc,
 492                                   struct ieee80211_roc_work *cur_roc)
 493 {
 494         unsigned long now = jiffies;
 495         unsigned long remaining;
 496
 497         if (WARN_ON(!cur_roc->started))
 498                 return false;
 499
 500         /* if it was scheduled in the hardware, but not started yet,
 501          * we can only combine if the older one had a longer duration
 502          */
 503         if (!cur_roc->hw_begun && new_roc->duration > cur_roc->duration)
 504                 return false;
 505
 506         remaining = cur_roc->start_time +
 507                     msecs_to_jiffies(cur_roc->duration) -
 508                     now;
 509
 510         /* if it doesn't fit entirely, schedule a new one */
 511         if (new_roc->duration > jiffies_to_msecs(remaining))
 512                 return false;
 513
 514         /* add just after the current one so we combine their finish later */
 515         list_add(&new_roc->list, &cur_roc->list);
 516
 517         /* if the existing one has already begun then let this one also
 518          * begin, otherwise they'll both be marked properly by the work
 519          * struct that runs once the driver notifies us of the beginning
 520          */
 521         if (cur_roc->hw_begun) {
 522                 new_roc->hw_begun = true;
 523                 ieee80211_handle_roc_started(new_roc, now);
 524         }
 525
 526         return true;
 527 }
 528
 529 static int ieee80211_start_roc_work(struct ieee80211_local *local,
 530                                     struct ieee80211_sub_if_data *sdata,
 531                                     struct ieee80211_channel *channel,
 532                                     unsigned int duration, u64 *cookie,
 533                                     struct sk_buff *txskb,
 534                                     enum ieee80211_roc_type type)
 535 {
 536         struct ieee80211_roc_work *roc, *tmp;
 537         bool queued = false, combine_started = true;
 538         int ret;
 539
 540         lockdep_assert_held(&local->mtx);
 541
 542         if (channel->freq_offset)
 543                 /* this may work, but is untested */
 544                 return -EOPNOTSUPP;
 545
 546         if (local->use_chanctx && !local->ops->remain_on_channel)
 547                 return -EOPNOTSUPP;
 548
 549         roc = kzalloc(sizeof(*roc), GFP_KERNEL);
 550         if (!roc)
 551                 return -ENOMEM;
 552
 553         /*
 554          * If the duration is zero, then the driver
 555          * wouldn't actually do anything. Set it to
 556          * 10 for now.
 557          *
 558          * TODO: cancel the off-channel operation
 559          *       when we get the SKB's TX status and
 560          *       the wait time was zero before.
 561          */
 562         if (!duration)
 563                 duration = 10;
 564
 565         roc->chan = channel;
 566         roc->duration = duration;
 567         roc->req_duration = duration;
 568         roc->frame = txskb;
 569         roc->type = type;
 570         roc->sdata = sdata;
 571
 572         /*
 573          * cookie is either the roc cookie (for normal roc)
 574          * or the SKB (for mgmt TX)
 575          */
 576         if (!txskb) {
 577                 roc->cookie = ieee80211_mgmt_tx_cookie(local);
 578                 *cookie = roc->cookie;
 579         } else {
 580                 roc->mgmt_tx_cookie = *cookie;
 581         }
 582
 583         /* if there's no need to queue, handle it immediately */
 584         if (list_empty(&local->roc_list) &&
 585             !local->scanning && !ieee80211_is_radar_required(local)) {
 586                 /* if not HW assist, just queue & schedule work */
 587                 if (!local->ops->remain_on_channel) {
 588                         list_add_tail(&roc->list, &local->roc_list);
 589                         ieee80211_queue_delayed_work(&local->hw,
 590                                                      &local->roc_work, 0);
 591                 } else {
 592                         /* otherwise actually kick it off here
 593                          * (for error handling)
 594                          */
 595                         ret = drv_remain_on_channel(local, sdata, channel,
 596                                                     duration, type);
 597                         if (ret) {
 598                                 kfree(roc);
 599                                 return ret;
 600                         }
 601                         roc->started = true;
 602                         list_add_tail(&roc->list, &local->roc_list);
 603                 }
 604
 605                 return 0;
 606         }
 607
 608         /* otherwise handle queueing */
 609
 610         list_for_each_entry(tmp, &local->roc_list, list) {
 611                 if (tmp->chan != channel || tmp->sdata != sdata)
 612                         continue;
 613
 614                 /*
 615                  * Extend this ROC if possible: If it hasn't started, add
 616                  * just after the new one to combine.
 617                  */
 618                 if (!tmp->started) {
 619                         list_add(&roc->list, &tmp->list);
 620                         queued = true;
 621                         break;
 622                 }
 623
 624                 if (!combine_started)
 625                         continue;
 626
 627                 if (!local->ops->remain_on_channel) {
 628                         /* If there's no hardware remain-on-channel, and
 629                          * doing so won't push us over the maximum r-o-c
 630                          * we allow, then we can just add the new one to
 631                          * the list and mark it as having started now.
 632                          * If it would push over the limit, don't try to
 633                          * combine with other started ones (that haven't
 634                          * been running as long) but potentially sort it
 635                          * with others that had the same fate.
 636                          */
 637                         unsigned long now = jiffies;
 638                         u32 elapsed = jiffies_to_msecs(now - tmp->start_time);
 639                         struct wiphy *wiphy = local->hw.wiphy;
 640                         u32 max_roc = wiphy->max_remain_on_channel_duration;
 641
 642                         if (elapsed + roc->duration > max_roc) {
 643                                 combine_started = false;
 644                                 continue;
 645                         }
 646
 647                         list_add(&roc->list, &tmp->list);
 648                         queued = true;
 649                         roc->on_channel = tmp->on_channel;
 650                         ieee80211_handle_roc_started(roc, now);
 651                         ieee80211_recalc_sw_work(local, now);
 652                         break;
 653                 }
 654
 655                 queued = ieee80211_coalesce_hw_started_roc(local, roc, tmp);
 656                 if (queued)
 657                         break;
 658                 /* if it wasn't queued, perhaps it can be combined with
 659                  * another that also couldn't get combined previously,
 660                  * but no need to check for already started ones, since
 661                  * that can't work.
 662                  */
 663                 combine_started = false;
 664         }
 665
 666         if (!queued)
 667                 list_add_tail(&roc->list, &local->roc_list);
 668
 669         return 0;
 670 }
 671
 672 int ieee80211_remain_on_channel(struct wiphy *wiphy, struct wireless_dev *wdev,
 673                                 struct ieee80211_channel *chan,
 674                                 unsigned int duration, u64 *cookie)
 675 {
 676         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 677         struct ieee80211_local *local = sdata->local;
 678         int ret;
 679
 680         mutex_lock(&local->mtx);
 681         ret = ieee80211_start_roc_work(local, sdata, chan,
 682                                        duration, cookie, NULL,
 683                                        IEEE80211_ROC_TYPE_NORMAL);
 684         mutex_unlock(&local->mtx);
 685
 686         return ret;
 687 }
 688
 689 static int ieee80211_cancel_roc(struct ieee80211_local *local,
 690                                 u64 cookie, bool mgmt_tx)
 691 {
 692         struct ieee80211_roc_work *roc, *tmp, *found = NULL;
 693         int ret;
 694
 695         if (!cookie)
 696                 return -ENOENT;
 697
 698         flush_work(&local->hw_roc_start);
 699
 700         mutex_lock(&local->mtx);
 701         list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
 702                 if (!mgmt_tx && roc->cookie != cookie)
 703                         continue;
 704                 else if (mgmt_tx && roc->mgmt_tx_cookie != cookie)
 705                         continue;
 706
 707                 found = roc;
 708                 break;
 709         }
 710
 711         if (!found) {
 712                 mutex_unlock(&local->mtx);
 713                 return -ENOENT;
 714         }
 715
 716         if (!found->started) {
 717                 ieee80211_roc_notify_destroy(found);
 718                 goto out_unlock;
 719         }
 720
 721         if (local->ops->remain_on_channel) {
 722                 ret = drv_cancel_remain_on_channel(local, roc->sdata);
 723                 if (WARN_ON_ONCE(ret)) {
 724                         mutex_unlock(&local->mtx);
 725                         return ret;
 726                 }
 727
 728                 /* TODO:
 729                  * if multiple items were combined here then we really shouldn't
 730                  * cancel them all - we should wait for as much time as needed
 731                  * for the longest remaining one, and only then cancel ...
 732                  */
 733                 list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
 734                         if (!roc->started)
 735                                 break;
 736                         if (roc == found)
 737                                 found = NULL;
 738                         ieee80211_roc_notify_destroy(roc);
 739                 }
 740
 741                 /* that really must not happen - it was started */
 742                 WARN_ON(found);
 743
 744                 ieee80211_start_next_roc(local);
 745         } else {
 746                 /* go through work struct to return to the operating channel */
 747                 found->abort = true;
 748                 mod_delayed_work(local->workqueue, &local->roc_work, 0);
 749         }
 750
 751  out_unlock:
 752         mutex_unlock(&local->mtx);
 753
 754         return 0;
 755 }
 756
 757 int ieee80211_cancel_remain_on_channel(struct wiphy *wiphy,
 758                                        struct wireless_dev *wdev, u64 cookie)
 759 {
 760         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 761         struct ieee80211_local *local = sdata->local;
 762
 763         return ieee80211_cancel_roc(local, cookie, false);
 764 }
 765
 766 int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 767                       struct cfg80211_mgmt_tx_params *params, u64 *cookie)
 768 {
 769         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 770         struct ieee80211_local *local = sdata->local;
 771         struct sk_buff *skb;
 772         struct sta_info *sta = NULL;
 773         const struct ieee80211_mgmt *mgmt = (void *)params->buf;
 774         bool need_offchan = false;
 775         bool mlo_sta = false;
 776         int link_id = -1;
 777         u32 flags;
 778         int ret;
 779         u8 *data;
 780
 781         if (params->dont_wait_for_ack)
 782                 flags = IEEE80211_TX_CTL_NO_ACK;
 783         else
 784                 flags = IEEE80211_TX_INTFL_NL80211_FRAME_TX |
 785                         IEEE80211_TX_CTL_REQ_TX_STATUS;
 786
 787         if (params->no_cck)
 788                 flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
 789
 790         switch (sdata->vif.type) {
 791         case NL80211_IFTYPE_ADHOC:
 792                 if (!sdata->vif.cfg.ibss_joined)
 793                         need_offchan = true;
 794 #ifdef CONFIG_MAC80211_MESH
 795                 fallthrough;
 796         case NL80211_IFTYPE_MESH_POINT:
 797                 if (ieee80211_vif_is_mesh(&sdata->vif) &&
 798                     !sdata->u.mesh.mesh_id_len)
 799                         need_offchan = true;
 800 #endif
 801                 fallthrough;
 802         case NL80211_IFTYPE_AP:
 803         case NL80211_IFTYPE_AP_VLAN:
 804         case NL80211_IFTYPE_P2P_GO:
 805                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
 806                     !ieee80211_vif_is_mesh(&sdata->vif) &&
 807                     !sdata->bss->active)
 808                         need_offchan = true;
 809
 810                 rcu_read_lock();
 811                 sta = sta_info_get_bss(sdata, mgmt->da);
 812                 mlo_sta = sta && sta->sta.mlo;
 813
 814                 if (!ieee80211_is_action(mgmt->frame_control) ||
 815                     mgmt->u.action.category == WLAN_CATEGORY_PUBLIC ||
 816                     mgmt->u.action.category == WLAN_CATEGORY_SELF_PROTECTED ||
 817                     mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
 818                         rcu_read_unlock();
 819                         break;
 820                 }
 821
 822                 if (!sta) {
 823                         rcu_read_unlock();
 824                         return -ENOLINK;
 825                 }
 826                 if (params->link_id >= 0 &&
 827                     !(sta->sta.valid_links & BIT(params->link_id))) {
 828                         rcu_read_unlock();
 829                         return -ENOLINK;
 830                 }
 831                 link_id = params->link_id;
 832                 rcu_read_unlock();
 833                 break;
 834         case NL80211_IFTYPE_STATION:
 835         case NL80211_IFTYPE_P2P_CLIENT:
 836                 sdata_lock(sdata);
 837                 if (!sdata->u.mgd.associated ||
 838                     (params->offchan && params->wait &&
 839                      local->ops->remain_on_channel &&
 840                      memcmp(sdata->vif.cfg.ap_addr, mgmt->bssid, ETH_ALEN)))
 841                         need_offchan = true;
 842                 sdata_unlock(sdata);
 843                 break;
 844         case NL80211_IFTYPE_P2P_DEVICE:
 845                 need_offchan = true;
 846                 break;
 847         case NL80211_IFTYPE_NAN:
 848         default:
 849                 return -EOPNOTSUPP;
 850         }
 851
 852         /* configurations requiring offchan cannot work if no channel has been
 853          * specified
 854          */
 855         if (need_offchan && !params->chan)
 856                 return -EINVAL;
 857
 858         mutex_lock(&local->mtx);
 859
 860         /* Check if the operating channel is the requested channel */
 861         if (!params->chan && mlo_sta) {
 862                 need_offchan = false;
 863         } else if (!need_offchan) {
 864                 struct ieee80211_chanctx_conf *chanctx_conf = NULL;
 865                 int i;
 866
 867                 rcu_read_lock();
 868                 /* Check all the links first */
 869                 for (i = 0; i < ARRAY_SIZE(sdata->vif.link_conf); i++) {
 870                         struct ieee80211_bss_conf *conf;
 871
 872                         conf = rcu_dereference(sdata->vif.link_conf[i]);
 873                         if (!conf)
 874                                 continue;
 875
 876                         chanctx_conf = rcu_dereference(conf->chanctx_conf);
 877                         if (!chanctx_conf)
 878                                 continue;
 879
 880                         if (mlo_sta && params->chan == chanctx_conf->def.chan &&
 881                             ether_addr_equal(sdata->vif.addr, mgmt->sa)) {
 882                                 link_id = i;
 883                                 break;
 884                         }
 885
 886                         if (ether_addr_equal(conf->addr, mgmt->sa))
 887                                 break;
 888
 889                         chanctx_conf = NULL;
 890                 }
 891
 892                 if (chanctx_conf) {
 893                         need_offchan = params->chan &&
 894                                        (params->chan !=
 895                                         chanctx_conf->def.chan);
 896                 } else {
 897                         need_offchan = true;
 898                 }
 899                 rcu_read_unlock();
 900         }
 901
 902         if (need_offchan && !params->offchan) {
 903                 ret = -EBUSY;
 904                 goto out_unlock;
 905         }
 906
 907         skb = dev_alloc_skb(local->hw.extra_tx_headroom + params->len);
 908         if (!skb) {
 909                 ret = -ENOMEM;
 910                 goto out_unlock;
 911         }
 912         skb_reserve(skb, local->hw.extra_tx_headroom);
 913
 914         data = skb_put_data(skb, params->buf, params->len);
 915
 916         /* Update CSA counters */
 917         if (sdata->vif.bss_conf.csa_active &&
 918             (sdata->vif.type == NL80211_IFTYPE_AP ||
 919              sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
 920              sdata->vif.type == NL80211_IFTYPE_ADHOC) &&
 921             params->n_csa_offsets) {
 922                 int i;
 923                 struct beacon_data *beacon = NULL;
 924
 925                 rcu_read_lock();
 926
 927                 if (sdata->vif.type == NL80211_IFTYPE_AP)
 928                         beacon = rcu_dereference(sdata->deflink.u.ap.beacon);
 929                 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 930                         beacon = rcu_dereference(sdata->u.ibss.presp);
 931                 else if (ieee80211_vif_is_mesh(&sdata->vif))
 932                         beacon = rcu_dereference(sdata->u.mesh.beacon);
 933
 934                 if (beacon)
 935                         for (i = 0; i < params->n_csa_offsets; i++)
 936                                 data[params->csa_offsets[i]] =
 937                                         beacon->cntdwn_current_counter;
 938
 939                 rcu_read_unlock();
 940         }
 941
 942         IEEE80211_SKB_CB(skb)->flags = flags;
 943
 944         skb->dev = sdata->dev;
 945
 946         if (!params->dont_wait_for_ack) {
 947                 /* make a copy to preserve the frame contents
 948                  * in case of encryption.
 949                  */
 950                 ret = ieee80211_attach_ack_skb(local, skb, cookie, GFP_KERNEL);
 951                 if (ret) {
 952                         kfree_skb(skb);
 953                         goto out_unlock;
 954                 }
 955         } else {
 956                 /* Assign a dummy non-zero cookie, it's not sent to
 957                  * userspace in this case but we rely on its value
 958                  * internally in the need_offchan case to distinguish
 959                  * mgmt-tx from remain-on-channel.
 960                  */
 961                 *cookie = 0xffffffff;
 962         }
 963
 964         if (!need_offchan) {
 965                 ieee80211_tx_skb_tid(sdata, skb, 7, link_id);
 966                 ret = 0;
 967                 goto out_unlock;
 968         }
 969
 970         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_TX_OFFCHAN |
 971                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 972         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 973                 IEEE80211_SKB_CB(skb)->hw_queue =
 974                         local->hw.offchannel_tx_hw_queue;
 975
 976         /* This will handle all kinds of coalescing and immediate TX */
 977         ret = ieee80211_start_roc_work(local, sdata, params->chan,
 978                                        params->wait, cookie, skb,
 979                                        IEEE80211_ROC_TYPE_MGMT_TX);
 980         if (ret)
 981                 ieee80211_free_txskb(&local->hw, skb);
 982  out_unlock:
 983         mutex_unlock(&local->mtx);
 984         return ret;
 985 }
 986
 987 int ieee80211_mgmt_tx_cancel_wait(struct wiphy *wiphy,
 988                                   struct wireless_dev *wdev, u64 cookie)
 989 {
 990         struct ieee80211_local *local = wiphy_priv(wiphy);
 991
 992         return ieee80211_cancel_roc(local, cookie, true);
 993 }
 994
 995 void ieee80211_roc_setup(struct ieee80211_local *local)
 996 {
 997         INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
 998         INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
 999         INIT_DELAYED_WORK(&local->roc_work, ieee80211_roc_work);
1000         INIT_LIST_HEAD(&local->roc_list);
1001 }
1002
1003 void ieee80211_roc_purge(struct ieee80211_local *local,
1004                          struct ieee80211_sub_if_data *sdata)
1005 {
1006         struct ieee80211_roc_work *roc, *tmp;
1007         bool work_to_do = false;
1008
1009         mutex_lock(&local->mtx);
1010         list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
1011                 if (sdata && roc->sdata != sdata)
1012                         continue;
1013
1014                 if (roc->started) {
1015                         if (local->ops->remain_on_channel) {
1016                                 /* can race, so ignore return value */
1017                                 drv_cancel_remain_on_channel(local, sdata);
1018                                 ieee80211_roc_notify_destroy(roc);
1019                         } else {
1020                                 roc->abort = true;
1021                                 work_to_do = true;
1022                         }
1023                 } else {
1024                         ieee80211_roc_notify_destroy(roc);
1025                 }
1026         }
1027         if (work_to_do)
1028                 __ieee80211_roc_work(local);
1029         mutex_unlock(&local->mtx);
1030 }