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, 2022-2023 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         wiphy_work_cancel(local->hw.wiphy, &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         lockdep_assert_wiphy(local->hw.wiphy);
  88
  89         if (WARN_ON(local->use_chanctx))
  90                 return;
  91
  92         /*
  93          * notify the AP about us leaving the channel and stop all
  94          * STA interfaces.
  95          */
  96
  97         /*
  98          * Stop queues and transmit all frames queued by the driver
  99          * before sending nullfunc to enable powersave at the AP.
 100          */
 101         ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
 102                                         IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL,
 103                                         false);
 104         ieee80211_flush_queues(local, NULL, false);
 105
 106         list_for_each_entry(sdata, &local->interfaces, list) {
 107                 if (!ieee80211_sdata_running(sdata))
 108                         continue;
 109
 110                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE ||
 111                     sdata->vif.type == NL80211_IFTYPE_NAN)
 112                         continue;
 113
 114                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 115                         set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
 116
 117                 /* Check to see if we should disable beaconing. */
 118                 if (sdata->vif.bss_conf.enable_beacon) {
 119                         set_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
 120                                 &sdata->state);
 121                         sdata->vif.bss_conf.enable_beacon = false;
 122                         ieee80211_link_info_change_notify(
 123                                 sdata, &sdata->deflink,
 124                                 BSS_CHANGED_BEACON_ENABLED);
 125                 }
 126
 127                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 128                     sdata->u.mgd.associated)
 129                         ieee80211_offchannel_ps_enable(sdata);
 130         }
 131 }
 132
 133 void ieee80211_offchannel_return(struct ieee80211_local *local)
 134 {
 135         struct ieee80211_sub_if_data *sdata;
 136
 137         lockdep_assert_wiphy(local->hw.wiphy);
 138
 139         if (WARN_ON(local->use_chanctx))
 140                 return;
 141
 142         list_for_each_entry(sdata, &local->interfaces, list) {
 143                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
 144                         continue;
 145
 146                 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
 147                         clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
 148
 149                 if (!ieee80211_sdata_running(sdata))
 150                         continue;
 151
 152                 /* Tell AP we're back */
 153                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 154                     sdata->u.mgd.associated)
 155                         ieee80211_offchannel_ps_disable(sdata);
 156
 157                 if (test_and_clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
 158                                        &sdata->state)) {
 159                         sdata->vif.bss_conf.enable_beacon = true;
 160                         ieee80211_link_info_change_notify(
 161                                 sdata, &sdata->deflink,
 162                                 BSS_CHANGED_BEACON_ENABLED);
 163                 }
 164         }
 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_wiphy(local->hw.wiphy);
 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         wiphy_delayed_work_queue(local->hw.wiphy, &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 wiphy *wiphy, struct wiphy_work *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         lockdep_assert_wiphy(local->hw.wiphy);
 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
 278 void ieee80211_ready_on_channel(struct ieee80211_hw *hw)
 279 {
 280         struct ieee80211_local *local = hw_to_local(hw);
 281
 282         local->hw_roc_start_time = jiffies;
 283
 284         trace_api_ready_on_channel(local);
 285
 286         wiphy_work_queue(hw->wiphy, &local->hw_roc_start);
 287 }
 288 EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel);
 289
 290 static void _ieee80211_start_next_roc(struct ieee80211_local *local)
 291 {
 292         struct ieee80211_roc_work *roc, *tmp;
 293         enum ieee80211_roc_type type;
 294         u32 min_dur, max_dur;
 295
 296         lockdep_assert_wiphy(local->hw.wiphy);
 297
 298         if (WARN_ON(list_empty(&local->roc_list)))
 299                 return;
 300
 301         roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
 302                                list);
 303
 304         if (WARN_ON(roc->started))
 305                 return;
 306
 307         min_dur = roc->duration;
 308         max_dur = roc->duration;
 309         type = roc->type;
 310
 311         list_for_each_entry(tmp, &local->roc_list, list) {
 312                 if (tmp == roc)
 313                         continue;
 314                 if (tmp->sdata != roc->sdata || tmp->chan != roc->chan)
 315                         break;
 316                 max_dur = max(tmp->duration, max_dur);
 317                 min_dur = min(tmp->duration, min_dur);
 318                 type = max(tmp->type, type);
 319         }
 320
 321         if (local->ops->remain_on_channel) {
 322                 int ret = drv_remain_on_channel(local, roc->sdata, roc->chan,
 323                                                 max_dur, type);
 324
 325                 if (ret) {
 326                         wiphy_warn(local->hw.wiphy,
 327                                    "failed to start next HW ROC (%d)\n", ret);
 328                         /*
 329                          * queue the work struct again to avoid recursion
 330                          * when multiple failures occur
 331                          */
 332                         list_for_each_entry(tmp, &local->roc_list, list) {
 333                                 if (tmp->sdata != roc->sdata ||
 334                                     tmp->chan != roc->chan)
 335                                         break;
 336                                 tmp->started = true;
 337                                 tmp->abort = true;
 338                         }
 339                         wiphy_work_queue(local->hw.wiphy, &local->hw_roc_done);
 340                         return;
 341                 }
 342
 343                 /* we'll notify about the start once the HW calls back */
 344                 list_for_each_entry(tmp, &local->roc_list, list) {
 345                         if (tmp->sdata != roc->sdata || tmp->chan != roc->chan)
 346                                 break;
 347                         tmp->started = true;
 348                 }
 349         } else {
 350                 /* If actually operating on the desired channel (with at least
 351                  * 20 MHz channel width) don't stop all the operations but still
 352                  * treat it as though the ROC operation started properly, so
 353                  * other ROC operations won't interfere with this one.
 354                  */
 355                 roc->on_channel = roc->chan == local->_oper_chandef.chan &&
 356                                   local->_oper_chandef.width != NL80211_CHAN_WIDTH_5 &&
 357                                   local->_oper_chandef.width != NL80211_CHAN_WIDTH_10;
 358
 359                 /* start this ROC */
 360                 ieee80211_recalc_idle(local);
 361
 362                 if (!roc->on_channel) {
 363                         ieee80211_offchannel_stop_vifs(local);
 364
 365                         local->tmp_channel = roc->chan;
 366                         ieee80211_hw_config(local, 0);
 367                 }
 368
 369                 wiphy_delayed_work_queue(local->hw.wiphy, &local->roc_work,
 370                                          msecs_to_jiffies(min_dur));
 371
 372                 /* tell userspace or send frame(s) */
 373                 list_for_each_entry(tmp, &local->roc_list, list) {
 374                         if (tmp->sdata != roc->sdata || tmp->chan != roc->chan)
 375                                 break;
 376
 377                         tmp->on_channel = roc->on_channel;
 378                         ieee80211_handle_roc_started(tmp, jiffies);
 379                 }
 380         }
 381 }
 382
 383 void ieee80211_start_next_roc(struct ieee80211_local *local)
 384 {
 385         struct ieee80211_roc_work *roc;
 386
 387         lockdep_assert_wiphy(local->hw.wiphy);
 388
 389         if (list_empty(&local->roc_list)) {
 390                 ieee80211_run_deferred_scan(local);
 391                 return;
 392         }
 393
 394         /* defer roc if driver is not started (i.e. during reconfig) */
 395         if (local->in_reconfig)
 396                 return;
 397
 398         roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
 399                                list);
 400
 401         if (WARN_ON_ONCE(roc->started))
 402                 return;
 403
 404         if (local->ops->remain_on_channel) {
 405                 _ieee80211_start_next_roc(local);
 406         } else {
 407                 /* delay it a bit */
 408                 wiphy_delayed_work_queue(local->hw.wiphy, &local->roc_work,
 409                                          round_jiffies_relative(HZ / 2));
 410         }
 411 }
 412
 413 static void __ieee80211_roc_work(struct ieee80211_local *local)
 414 {
 415         struct ieee80211_roc_work *roc;
 416         bool on_channel;
 417
 418         lockdep_assert_wiphy(local->hw.wiphy);
 419
 420         if (WARN_ON(local->ops->remain_on_channel))
 421                 return;
 422
 423         roc = list_first_entry_or_null(&local->roc_list,
 424                                        struct ieee80211_roc_work, list);
 425         if (!roc)
 426                 return;
 427
 428         if (!roc->started) {
 429                 WARN_ON(local->use_chanctx);
 430                 _ieee80211_start_next_roc(local);
 431         } else {
 432                 on_channel = roc->on_channel;
 433                 if (ieee80211_recalc_sw_work(local, jiffies))
 434                         return;
 435
 436                 /* careful - roc pointer became invalid during recalc */
 437
 438                 if (!on_channel) {
 439                         ieee80211_flush_queues(local, NULL, false);
 440
 441                         local->tmp_channel = NULL;
 442                         ieee80211_hw_config(local, 0);
 443
 444                         ieee80211_offchannel_return(local);
 445                 }
 446
 447                 ieee80211_recalc_idle(local);
 448                 ieee80211_start_next_roc(local);
 449         }
 450 }
 451
 452 static void ieee80211_roc_work(struct wiphy *wiphy, struct wiphy_work *work)
 453 {
 454         struct ieee80211_local *local =
 455                 container_of(work, struct ieee80211_local, roc_work.work);
 456
 457         lockdep_assert_wiphy(local->hw.wiphy);
 458
 459         __ieee80211_roc_work(local);
 460 }
 461
 462 static void ieee80211_hw_roc_done(struct wiphy *wiphy, struct wiphy_work *work)
 463 {
 464         struct ieee80211_local *local =
 465                 container_of(work, struct ieee80211_local, hw_roc_done);
 466
 467         lockdep_assert_wiphy(local->hw.wiphy);
 468
 469         ieee80211_end_finished_rocs(local, jiffies);
 470
 471         /* if there's another roc, start it now */
 472         ieee80211_start_next_roc(local);
 473 }
 474
 475 void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
 476 {
 477         struct ieee80211_local *local = hw_to_local(hw);
 478
 479         trace_api_remain_on_channel_expired(local);
 480
 481         wiphy_work_queue(hw->wiphy, &local->hw_roc_done);
 482 }
 483 EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
 484
 485 static bool
 486 ieee80211_coalesce_hw_started_roc(struct ieee80211_local *local,
 487                                   struct ieee80211_roc_work *new_roc,
 488                                   struct ieee80211_roc_work *cur_roc)
 489 {
 490         unsigned long now = jiffies;
 491         unsigned long remaining;
 492
 493         if (WARN_ON(!cur_roc->started))
 494                 return false;
 495
 496         /* if it was scheduled in the hardware, but not started yet,
 497          * we can only combine if the older one had a longer duration
 498          */
 499         if (!cur_roc->hw_begun && new_roc->duration > cur_roc->duration)
 500                 return false;
 501
 502         remaining = cur_roc->start_time +
 503                     msecs_to_jiffies(cur_roc->duration) -
 504                     now;
 505
 506         /* if it doesn't fit entirely, schedule a new one */
 507         if (new_roc->duration > jiffies_to_msecs(remaining))
 508                 return false;
 509
 510         /* add just after the current one so we combine their finish later */
 511         list_add(&new_roc->list, &cur_roc->list);
 512
 513         /* if the existing one has already begun then let this one also
 514          * begin, otherwise they'll both be marked properly by the work
 515          * struct that runs once the driver notifies us of the beginning
 516          */
 517         if (cur_roc->hw_begun) {
 518                 new_roc->hw_begun = true;
 519                 ieee80211_handle_roc_started(new_roc, now);
 520         }
 521
 522         return true;
 523 }
 524
 525 static int ieee80211_start_roc_work(struct ieee80211_local *local,
 526                                     struct ieee80211_sub_if_data *sdata,
 527                                     struct ieee80211_channel *channel,
 528                                     unsigned int duration, u64 *cookie,
 529                                     struct sk_buff *txskb,
 530                                     enum ieee80211_roc_type type)
 531 {
 532         struct ieee80211_roc_work *roc, *tmp;
 533         bool queued = false, combine_started = true;
 534         int ret;
 535
 536         lockdep_assert_wiphy(local->hw.wiphy);
 537
 538         if (channel->freq_offset)
 539                 /* this may work, but is untested */
 540                 return -EOPNOTSUPP;
 541
 542         if (local->use_chanctx && !local->ops->remain_on_channel)
 543                 return -EOPNOTSUPP;
 544
 545         roc = kzalloc(sizeof(*roc), GFP_KERNEL);
 546         if (!roc)
 547                 return -ENOMEM;
 548
 549         /*
 550          * If the duration is zero, then the driver
 551          * wouldn't actually do anything. Set it to
 552          * 10 for now.
 553          *
 554          * TODO: cancel the off-channel operation
 555          *       when we get the SKB's TX status and
 556          *       the wait time was zero before.
 557          */
 558         if (!duration)
 559                 duration = 10;
 560
 561         roc->chan = channel;
 562         roc->duration = duration;
 563         roc->req_duration = duration;
 564         roc->frame = txskb;
 565         roc->type = type;
 566         roc->sdata = sdata;
 567
 568         /*
 569          * cookie is either the roc cookie (for normal roc)
 570          * or the SKB (for mgmt TX)
 571          */
 572         if (!txskb) {
 573                 roc->cookie = ieee80211_mgmt_tx_cookie(local);
 574                 *cookie = roc->cookie;
 575         } else {
 576                 roc->mgmt_tx_cookie = *cookie;
 577         }
 578
 579         /* if there's no need to queue, handle it immediately */
 580         if (list_empty(&local->roc_list) &&
 581             !local->scanning && !ieee80211_is_radar_required(local)) {
 582                 /* if not HW assist, just queue & schedule work */
 583                 if (!local->ops->remain_on_channel) {
 584                         list_add_tail(&roc->list, &local->roc_list);
 585                         wiphy_delayed_work_queue(local->hw.wiphy,
 586                                                  &local->roc_work, 0);
 587                 } else {
 588                         /* otherwise actually kick it off here
 589                          * (for error handling)
 590                          */
 591                         ret = drv_remain_on_channel(local, sdata, channel,
 592                                                     duration, type);
 593                         if (ret) {
 594                                 kfree(roc);
 595                                 return ret;
 596                         }
 597                         roc->started = true;
 598                         list_add_tail(&roc->list, &local->roc_list);
 599                 }
 600
 601                 return 0;
 602         }
 603
 604         /* otherwise handle queueing */
 605
 606         list_for_each_entry(tmp, &local->roc_list, list) {
 607                 if (tmp->chan != channel || tmp->sdata != sdata)
 608                         continue;
 609
 610                 /*
 611                  * Extend this ROC if possible: If it hasn't started, add
 612                  * just after the new one to combine.
 613                  */
 614                 if (!tmp->started) {
 615                         list_add(&roc->list, &tmp->list);
 616                         queued = true;
 617                         break;
 618                 }
 619
 620                 if (!combine_started)
 621                         continue;
 622
 623                 if (!local->ops->remain_on_channel) {
 624                         /* If there's no hardware remain-on-channel, and
 625                          * doing so won't push us over the maximum r-o-c
 626                          * we allow, then we can just add the new one to
 627                          * the list and mark it as having started now.
 628                          * If it would push over the limit, don't try to
 629                          * combine with other started ones (that haven't
 630                          * been running as long) but potentially sort it
 631                          * with others that had the same fate.
 632                          */
 633                         unsigned long now = jiffies;
 634                         u32 elapsed = jiffies_to_msecs(now - tmp->start_time);
 635                         struct wiphy *wiphy = local->hw.wiphy;
 636                         u32 max_roc = wiphy->max_remain_on_channel_duration;
 637
 638                         if (elapsed + roc->duration > max_roc) {
 639                                 combine_started = false;
 640                                 continue;
 641                         }
 642
 643                         list_add(&roc->list, &tmp->list);
 644                         queued = true;
 645                         roc->on_channel = tmp->on_channel;
 646                         ieee80211_handle_roc_started(roc, now);
 647                         ieee80211_recalc_sw_work(local, now);
 648                         break;
 649                 }
 650
 651                 queued = ieee80211_coalesce_hw_started_roc(local, roc, tmp);
 652                 if (queued)
 653                         break;
 654                 /* if it wasn't queued, perhaps it can be combined with
 655                  * another that also couldn't get combined previously,
 656                  * but no need to check for already started ones, since
 657                  * that can't work.
 658                  */
 659                 combine_started = false;
 660         }
 661
 662         if (!queued)
 663                 list_add_tail(&roc->list, &local->roc_list);
 664
 665         return 0;
 666 }
 667
 668 int ieee80211_remain_on_channel(struct wiphy *wiphy, struct wireless_dev *wdev,
 669                                 struct ieee80211_channel *chan,
 670                                 unsigned int duration, u64 *cookie)
 671 {
 672         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 673         struct ieee80211_local *local = sdata->local;
 674
 675         lockdep_assert_wiphy(local->hw.wiphy);
 676
 677         return ieee80211_start_roc_work(local, sdata, chan,
 678                                         duration, cookie, NULL,
 679                                         IEEE80211_ROC_TYPE_NORMAL);
 680 }
 681
 682 static int ieee80211_cancel_roc(struct ieee80211_local *local,
 683                                 u64 cookie, bool mgmt_tx)
 684 {
 685         struct ieee80211_roc_work *roc, *tmp, *found = NULL;
 686         int ret;
 687
 688         lockdep_assert_wiphy(local->hw.wiphy);
 689
 690         if (!cookie)
 691                 return -ENOENT;
 692
 693         wiphy_work_flush(local->hw.wiphy, &local->hw_roc_start);
 694
 695         list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
 696                 if (!mgmt_tx && roc->cookie != cookie)
 697                         continue;
 698                 else if (mgmt_tx && roc->mgmt_tx_cookie != cookie)
 699                         continue;
 700
 701                 found = roc;
 702                 break;
 703         }
 704
 705         if (!found) {
 706                 return -ENOENT;
 707         }
 708
 709         if (!found->started) {
 710                 ieee80211_roc_notify_destroy(found);
 711                 goto out_unlock;
 712         }
 713
 714         if (local->ops->remain_on_channel) {
 715                 ret = drv_cancel_remain_on_channel(local, roc->sdata);
 716                 if (WARN_ON_ONCE(ret)) {
 717                         return ret;
 718                 }
 719
 720                 /*
 721                  * We could be racing against the notification from the driver:
 722                  *  + driver is handling the notification on CPU0
 723                  *  + user space is cancelling the remain on channel and
 724                  *    schedules the hw_roc_done worker.
 725                  *
 726                  *  Now hw_roc_done might start to run after the next roc will
 727                  *  start and mac80211 will think that this second roc has
 728                  *  ended prematurely.
 729                  *  Cancel the work to make sure that all the pending workers
 730                  *  have completed execution.
 731                  *  Note that this assumes that by the time the driver returns
 732                  *  from drv_cancel_remain_on_channel, it has completed all
 733                  *  the processing of related notifications.
 734                  */
 735                 wiphy_work_cancel(local->hw.wiphy, &local->hw_roc_done);
 736
 737                 /* TODO:
 738                  * if multiple items were combined here then we really shouldn't
 739                  * cancel them all - we should wait for as much time as needed
 740                  * for the longest remaining one, and only then cancel ...
 741                  */
 742                 list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
 743                         if (!roc->started)
 744                                 break;
 745                         if (roc == found)
 746                                 found = NULL;
 747                         ieee80211_roc_notify_destroy(roc);
 748                 }
 749
 750                 /* that really must not happen - it was started */
 751                 WARN_ON(found);
 752
 753                 ieee80211_start_next_roc(local);
 754         } else {
 755                 /* go through work struct to return to the operating channel */
 756                 found->abort = true;
 757                 wiphy_delayed_work_queue(local->hw.wiphy, &local->roc_work, 0);
 758         }
 759
 760  out_unlock:
 761
 762         return 0;
 763 }
 764
 765 int ieee80211_cancel_remain_on_channel(struct wiphy *wiphy,
 766                                        struct wireless_dev *wdev, u64 cookie)
 767 {
 768         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 769         struct ieee80211_local *local = sdata->local;
 770
 771         return ieee80211_cancel_roc(local, cookie, false);
 772 }
 773
 774 int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 775                       struct cfg80211_mgmt_tx_params *params, u64 *cookie)
 776 {
 777         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 778         struct ieee80211_local *local = sdata->local;
 779         struct sk_buff *skb;
 780         struct sta_info *sta = NULL;
 781         const struct ieee80211_mgmt *mgmt = (void *)params->buf;
 782         bool need_offchan = false;
 783         bool mlo_sta = false;
 784         int link_id = -1;
 785         u32 flags;
 786         int ret;
 787         u8 *data;
 788
 789         lockdep_assert_wiphy(local->hw.wiphy);
 790
 791         if (params->dont_wait_for_ack)
 792                 flags = IEEE80211_TX_CTL_NO_ACK;
 793         else
 794                 flags = IEEE80211_TX_INTFL_NL80211_FRAME_TX |
 795                         IEEE80211_TX_CTL_REQ_TX_STATUS;
 796
 797         if (params->no_cck)
 798                 flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
 799
 800         switch (sdata->vif.type) {
 801         case NL80211_IFTYPE_ADHOC:
 802                 if (!sdata->vif.cfg.ibss_joined)
 803                         need_offchan = true;
 804 #ifdef CONFIG_MAC80211_MESH
 805                 fallthrough;
 806         case NL80211_IFTYPE_MESH_POINT:
 807                 if (ieee80211_vif_is_mesh(&sdata->vif) &&
 808                     !sdata->u.mesh.mesh_id_len)
 809                         need_offchan = true;
 810 #endif
 811                 fallthrough;
 812         case NL80211_IFTYPE_AP:
 813         case NL80211_IFTYPE_AP_VLAN:
 814         case NL80211_IFTYPE_P2P_GO:
 815                 if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
 816                     !ieee80211_vif_is_mesh(&sdata->vif) &&
 817                     !sdata->bss->active)
 818                         need_offchan = true;
 819
 820                 rcu_read_lock();
 821                 sta = sta_info_get_bss(sdata, mgmt->da);
 822                 mlo_sta = sta && sta->sta.mlo;
 823
 824                 if (!ieee80211_is_action(mgmt->frame_control) ||
 825                     mgmt->u.action.category == WLAN_CATEGORY_PUBLIC ||
 826                     mgmt->u.action.category == WLAN_CATEGORY_SELF_PROTECTED ||
 827                     mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
 828                         rcu_read_unlock();
 829                         break;
 830                 }
 831
 832                 if (!sta) {
 833                         rcu_read_unlock();
 834                         return -ENOLINK;
 835                 }
 836                 if (params->link_id >= 0 &&
 837                     !(sta->sta.valid_links & BIT(params->link_id))) {
 838                         rcu_read_unlock();
 839                         return -ENOLINK;
 840                 }
 841                 link_id = params->link_id;
 842                 rcu_read_unlock();
 843                 break;
 844         case NL80211_IFTYPE_STATION:
 845         case NL80211_IFTYPE_P2P_CLIENT:
 846                 if (!sdata->u.mgd.associated ||
 847                     (params->offchan && params->wait &&
 848                      local->ops->remain_on_channel &&
 849                      memcmp(sdata->vif.cfg.ap_addr, mgmt->bssid, ETH_ALEN))) {
 850                         need_offchan = true;
 851                 } else if (sdata->u.mgd.associated &&
 852                            ether_addr_equal(sdata->vif.cfg.ap_addr, mgmt->da)) {
 853                         sta = sta_info_get_bss(sdata, mgmt->da);
 854                         mlo_sta = sta && sta->sta.mlo;
 855                 }
 856                 break;
 857         case NL80211_IFTYPE_P2P_DEVICE:
 858                 need_offchan = true;
 859                 break;
 860         case NL80211_IFTYPE_NAN:
 861         default:
 862                 return -EOPNOTSUPP;
 863         }
 864
 865         /* configurations requiring offchan cannot work if no channel has been
 866          * specified
 867          */
 868         if (need_offchan && !params->chan)
 869                 return -EINVAL;
 870
 871         /* Check if the operating channel is the requested channel */
 872         if (!params->chan && mlo_sta) {
 873                 need_offchan = false;
 874         } else if (!need_offchan) {
 875                 struct ieee80211_chanctx_conf *chanctx_conf = NULL;
 876                 int i;
 877
 878                 rcu_read_lock();
 879                 /* Check all the links first */
 880                 for (i = 0; i < ARRAY_SIZE(sdata->vif.link_conf); i++) {
 881                         struct ieee80211_bss_conf *conf;
 882
 883                         conf = rcu_dereference(sdata->vif.link_conf[i]);
 884                         if (!conf)
 885                                 continue;
 886
 887                         chanctx_conf = rcu_dereference(conf->chanctx_conf);
 888                         if (!chanctx_conf)
 889                                 continue;
 890
 891                         if (mlo_sta && params->chan == chanctx_conf->def.chan &&
 892                             ether_addr_equal(sdata->vif.addr, mgmt->sa)) {
 893                                 link_id = i;
 894                                 break;
 895                         }
 896
 897                         if (ether_addr_equal(conf->addr, mgmt->sa))
 898                                 break;
 899
 900                         chanctx_conf = NULL;
 901                 }
 902
 903                 if (chanctx_conf) {
 904                         need_offchan = params->chan &&
 905                                        (params->chan !=
 906                                         chanctx_conf->def.chan);
 907                 } else {
 908                         need_offchan = true;
 909                 }
 910                 rcu_read_unlock();
 911         }
 912
 913         if (need_offchan && !params->offchan) {
 914                 ret = -EBUSY;
 915                 goto out_unlock;
 916         }
 917
 918         skb = dev_alloc_skb(local->hw.extra_tx_headroom + params->len);
 919         if (!skb) {
 920                 ret = -ENOMEM;
 921                 goto out_unlock;
 922         }
 923         skb_reserve(skb, local->hw.extra_tx_headroom);
 924
 925         data = skb_put_data(skb, params->buf, params->len);
 926
 927         /* Update CSA counters */
 928         if (sdata->vif.bss_conf.csa_active &&
 929             (sdata->vif.type == NL80211_IFTYPE_AP ||
 930              sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
 931              sdata->vif.type == NL80211_IFTYPE_ADHOC) &&
 932             params->n_csa_offsets) {
 933                 int i;
 934                 struct beacon_data *beacon = NULL;
 935
 936                 rcu_read_lock();
 937
 938                 if (sdata->vif.type == NL80211_IFTYPE_AP)
 939                         beacon = rcu_dereference(sdata->deflink.u.ap.beacon);
 940                 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 941                         beacon = rcu_dereference(sdata->u.ibss.presp);
 942                 else if (ieee80211_vif_is_mesh(&sdata->vif))
 943                         beacon = rcu_dereference(sdata->u.mesh.beacon);
 944
 945                 if (beacon)
 946                         for (i = 0; i < params->n_csa_offsets; i++)
 947                                 data[params->csa_offsets[i]] =
 948                                         beacon->cntdwn_current_counter;
 949
 950                 rcu_read_unlock();
 951         }
 952
 953         IEEE80211_SKB_CB(skb)->flags = flags;
 954
 955         skb->dev = sdata->dev;
 956
 957         if (!params->dont_wait_for_ack) {
 958                 /* make a copy to preserve the frame contents
 959                  * in case of encryption.
 960                  */
 961                 ret = ieee80211_attach_ack_skb(local, skb, cookie, GFP_KERNEL);
 962                 if (ret) {
 963                         kfree_skb(skb);
 964                         goto out_unlock;
 965                 }
 966         } else {
 967                 /* Assign a dummy non-zero cookie, it's not sent to
 968                  * userspace in this case but we rely on its value
 969                  * internally in the need_offchan case to distinguish
 970                  * mgmt-tx from remain-on-channel.
 971                  */
 972                 *cookie = 0xffffffff;
 973         }
 974
 975         if (!need_offchan) {
 976                 ieee80211_tx_skb_tid(sdata, skb, 7, link_id);
 977                 ret = 0;
 978                 goto out_unlock;
 979         }
 980
 981         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_TX_OFFCHAN |
 982                                         IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 983         if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 984                 IEEE80211_SKB_CB(skb)->hw_queue =
 985                         local->hw.offchannel_tx_hw_queue;
 986
 987         /* This will handle all kinds of coalescing and immediate TX */
 988         ret = ieee80211_start_roc_work(local, sdata, params->chan,
 989                                        params->wait, cookie, skb,
 990                                        IEEE80211_ROC_TYPE_MGMT_TX);
 991         if (ret)
 992                 ieee80211_free_txskb(&local->hw, skb);
 993  out_unlock:
 994         return ret;
 995 }
 996
 997 int ieee80211_mgmt_tx_cancel_wait(struct wiphy *wiphy,
 998                                   struct wireless_dev *wdev, u64 cookie)
 999 {
1000         struct ieee80211_local *local = wiphy_priv(wiphy);
1001
1002         return ieee80211_cancel_roc(local, cookie, true);
1003 }
1004
1005 void ieee80211_roc_setup(struct ieee80211_local *local)
1006 {
1007         wiphy_work_init(&local->hw_roc_start, ieee80211_hw_roc_start);
1008         wiphy_work_init(&local->hw_roc_done, ieee80211_hw_roc_done);
1009         wiphy_delayed_work_init(&local->roc_work, ieee80211_roc_work);
1010         INIT_LIST_HEAD(&local->roc_list);
1011 }
1012
1013 void ieee80211_roc_purge(struct ieee80211_local *local,
1014                          struct ieee80211_sub_if_data *sdata)
1015 {
1016         struct ieee80211_roc_work *roc, *tmp;
1017         bool work_to_do = false;
1018
1019         lockdep_assert_wiphy(local->hw.wiphy);
1020
1021         list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
1022                 if (sdata && roc->sdata != sdata)
1023                         continue;
1024
1025                 if (roc->started) {
1026                         if (local->ops->remain_on_channel) {
1027                                 /* can race, so ignore return value */
1028                                 drv_cancel_remain_on_channel(local, roc->sdata);
1029                                 ieee80211_roc_notify_destroy(roc);
1030                         } else {
1031                                 roc->abort = true;
1032                                 work_to_do = true;
1033                         }
1034                 } else {
1035                         ieee80211_roc_notify_destroy(roc);
1036                 }
1037         }
1038         if (work_to_do)
1039                 __ieee80211_roc_work(local);
1040 }