tx.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright 2002-2005, Instant802 Networks, Inc.
   4 * Copyright 2005-2006, Devicescape Software, Inc.
   5 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
   6 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
   7 * Copyright 2013-2014  Intel Mobile Communications GmbH
   8 * Copyright (C) 2018-2025 Intel Corporation
   9 *
  10 * Transmit and frame generation functions.
  11 */
  12
  13#include <linux/kernel.h>
  14#include <linux/slab.h>
  15#include <linux/skbuff.h>
  16#include <linux/if_vlan.h>
  17#include <linux/etherdevice.h>
  18#include <linux/bitmap.h>
  19#include <linux/rcupdate.h>
  20#include <linux/export.h>
  21#include <net/net_namespace.h>
  22#include <net/ieee80211_radiotap.h>
  23#include <net/cfg80211.h>
  24#include <net/mac80211.h>
  25#include <net/codel.h>
  26#include <net/codel_impl.h>
  27#include <linux/unaligned.h>
  28#include <net/fq_impl.h>
  29#include <net/sock.h>
  30#include <net/gso.h>
  31
  32#include "ieee80211_i.h"
  33#include "driver-ops.h"
  34#include "led.h"
  35#include "mesh.h"
  36#include "wep.h"
  37#include "wpa.h"
  38#include "wme.h"
  39#include "rate.h"
  40
  41/* misc utils */
  42
  43static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
  44				 struct sk_buff *skb, int group_addr,
  45				 int next_frag_len)
  46{
  47	int rate, mrate, erp, dur, i;
  48	struct ieee80211_rate *txrate;
  49	struct ieee80211_local *local = tx->local;
  50	struct ieee80211_supported_band *sband;
  51	struct ieee80211_hdr *hdr;
  52	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  53
  54	/* assume HW handles this */
  55	if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
  56		return 0;
  57
  58	/* uh huh? */
  59	if (WARN_ON_ONCE(tx->rate.idx < 0))
  60		return 0;
  61
  62	if (info->band >= NUM_NL80211_BANDS)
  63		return 0;
  64
  65	sband = local->hw.wiphy->bands[info->band];
  66	txrate = &sband->bitrates[tx->rate.idx];
  67
  68	erp = txrate->flags & IEEE80211_RATE_ERP_G;
  69
  70	/* device is expected to do this */
  71	if (sband->band == NL80211_BAND_S1GHZ)
  72		return 0;
  73
  74	/*
  75	 * data and mgmt (except PS Poll):
  76	 * - during CFP: 32768
  77	 * - during contention period:
  78	 *   if addr1 is group address: 0
  79	 *   if more fragments = 0 and addr1 is individual address: time to
  80	 *      transmit one ACK plus SIFS
  81	 *   if more fragments = 1 and addr1 is individual address: time to
  82	 *      transmit next fragment plus 2 x ACK plus 3 x SIFS
  83	 *
  84	 * IEEE 802.11, 9.6:
  85	 * - control response frame (CTS or ACK) shall be transmitted using the
  86	 *   same rate as the immediately previous frame in the frame exchange
  87	 *   sequence, if this rate belongs to the PHY mandatory rates, or else
  88	 *   at the highest possible rate belonging to the PHY rates in the
  89	 *   BSSBasicRateSet
  90	 */
  91	hdr = (struct ieee80211_hdr *)skb->data;
  92	if (ieee80211_is_ctl(hdr->frame_control)) {
  93		/* TODO: These control frames are not currently sent by
  94		 * mac80211, but should they be implemented, this function
  95		 * needs to be updated to support duration field calculation.
  96		 *
  97		 * RTS: time needed to transmit pending data/mgmt frame plus
  98		 *    one CTS frame plus one ACK frame plus 3 x SIFS
  99		 * CTS: duration of immediately previous RTS minus time
 100		 *    required to transmit CTS and its SIFS
 101		 * ACK: 0 if immediately previous directed data/mgmt had
 102		 *    more=0, with more=1 duration in ACK frame is duration
 103		 *    from previous frame minus time needed to transmit ACK
 104		 *    and its SIFS
 105		 * PS Poll: BIT(15) | BIT(14) | aid
 106		 */
 107		return 0;
 108	}
 109
 110	/* data/mgmt */
 111	if (0 /* FIX: data/mgmt during CFP */)
 112		return cpu_to_le16(32768);
 113
 114	if (group_addr) /* Group address as the destination - no ACK */
 115		return 0;
 116
 117	/* Individual destination address:
 118	 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
 119	 * CTS and ACK frames shall be transmitted using the highest rate in
 120	 * basic rate set that is less than or equal to the rate of the
 121	 * immediately previous frame and that is using the same modulation
 122	 * (CCK or OFDM). If no basic rate set matches with these requirements,
 123	 * the highest mandatory rate of the PHY that is less than or equal to
 124	 * the rate of the previous frame is used.
 125	 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
 126	 */
 127	rate = -1;
 128	/* use lowest available if everything fails */
 129	mrate = sband->bitrates[0].bitrate;
 130	for (i = 0; i < sband->n_bitrates; i++) {
 131		struct ieee80211_rate *r = &sband->bitrates[i];
 132		u32 flag;
 133
 134		if (r->bitrate > txrate->bitrate)
 135			break;
 136
 137		if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
 138			rate = r->bitrate;
 139
 140		switch (sband->band) {
 141		case NL80211_BAND_2GHZ:
 142		case NL80211_BAND_LC:
 143			if (tx->sdata->deflink.operating_11g_mode)
 144				flag = IEEE80211_RATE_MANDATORY_G;
 145			else
 146				flag = IEEE80211_RATE_MANDATORY_B;
 147			break;
 148		case NL80211_BAND_5GHZ:
 149		case NL80211_BAND_6GHZ:
 150			flag = IEEE80211_RATE_MANDATORY_A;
 151			break;
 152		default:
 153			flag = 0;
 154			WARN_ON(1);
 155			break;
 156		}
 157
 158		if (r->flags & flag)
 159			mrate = r->bitrate;
 160	}
 161	if (rate == -1) {
 162		/* No matching basic rate found; use highest suitable mandatory
 163		 * PHY rate */
 164		rate = mrate;
 165	}
 166
 167	/* Don't calculate ACKs for QoS Frames with NoAck Policy set */
 168	if (ieee80211_is_data_qos(hdr->frame_control) &&
 169	    *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
 170		dur = 0;
 171	else
 172		/* Time needed to transmit ACK
 173		 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
 174		 * to closest integer */
 175		dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
 176				tx->sdata->vif.bss_conf.use_short_preamble);
 177
 178	if (next_frag_len) {
 179		/* Frame is fragmented: duration increases with time needed to
 180		 * transmit next fragment plus ACK and 2 x SIFS. */
 181		dur *= 2; /* ACK + SIFS */
 182		/* next fragment */
 183		dur += ieee80211_frame_duration(sband->band, next_frag_len,
 184				txrate->bitrate, erp,
 185				tx->sdata->vif.bss_conf.use_short_preamble);
 186	}
 187
 188	return cpu_to_le16(dur);
 189}
 190
 191/* tx handlers */
 192static ieee80211_tx_result debug_noinline
 193ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
 194{
 195	struct ieee80211_local *local = tx->local;
 196	struct ieee80211_if_managed *ifmgd;
 197	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 198
 199	/* driver doesn't support power save */
 200	if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
 201		return TX_CONTINUE;
 202
 203	/* hardware does dynamic power save */
 204	if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
 205		return TX_CONTINUE;
 206
 207	/* dynamic power save disabled */
 208	if (local->hw.conf.dynamic_ps_timeout <= 0)
 209		return TX_CONTINUE;
 210
 211	/* we are scanning, don't enable power save */
 212	if (local->scanning)
 213		return TX_CONTINUE;
 214
 215	if (!local->ps_sdata)
 216		return TX_CONTINUE;
 217
 218	/* No point if we're going to suspend */
 219	if (local->quiescing)
 220		return TX_CONTINUE;
 221
 222	/* dynamic ps is supported only in managed mode */
 223	if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
 224		return TX_CONTINUE;
 225
 226	if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK))
 227		return TX_CONTINUE;
 228
 229	ifmgd = &tx->sdata->u.mgd;
 230
 231	/*
 232	 * Don't wakeup from power save if u-apsd is enabled, voip ac has
 233	 * u-apsd enabled and the frame is in voip class. This effectively
 234	 * means that even if all access categories have u-apsd enabled, in
 235	 * practise u-apsd is only used with the voip ac. This is a
 236	 * workaround for the case when received voip class packets do not
 237	 * have correct qos tag for some reason, due the network or the
 238	 * peer application.
 239	 *
 240	 * Note: ifmgd->uapsd_queues access is racy here. If the value is
 241	 * changed via debugfs, user needs to reassociate manually to have
 242	 * everything in sync.
 243	 */
 244	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
 245	    (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
 246	    skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
 247		return TX_CONTINUE;
 248
 249	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 250		ieee80211_stop_queues_by_reason(&local->hw,
 251						IEEE80211_MAX_QUEUE_MAP,
 252						IEEE80211_QUEUE_STOP_REASON_PS,
 253						false);
 254		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 255		wiphy_work_queue(local->hw.wiphy,
 256				 &local->dynamic_ps_disable_work);
 257	}
 258
 259	/* Don't restart the timer if we're not disassociated */
 260	if (!ifmgd->associated)
 261		return TX_CONTINUE;
 262
 263	mod_timer(&local->dynamic_ps_timer, jiffies +
 264		  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
 265
 266	return TX_CONTINUE;
 267}
 268
 269static ieee80211_tx_result debug_noinline
 270ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
 271{
 272
 273	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 274	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 275	bool assoc = false;
 276
 277	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
 278		return TX_CONTINUE;
 279
 280	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
 281	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
 282	    !ieee80211_is_probe_req(hdr->frame_control) &&
 283	    !ieee80211_is_any_nullfunc(hdr->frame_control))
 284		/*
 285		 * When software scanning only nullfunc frames (to notify
 286		 * the sleep state to the AP) and probe requests (for the
 287		 * active scan) are allowed, all other frames should not be
 288		 * sent and we should not get here, but if we do
 289		 * nonetheless, drop them to avoid sending them
 290		 * off-channel. See the link below and
 291		 * ieee80211_start_scan() for more.
 292		 *
 293		 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
 294		 */
 295		return TX_DROP;
 296
 297	if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
 298		return TX_CONTINUE;
 299
 300	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
 301		return TX_CONTINUE;
 302
 303	if (tx->sta)
 304		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
 305
 306	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
 307		if (unlikely(!assoc &&
 308			     ieee80211_is_data(hdr->frame_control))) {
 309#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 310			sdata_info(tx->sdata,
 311				   "dropped data frame to not associated station %pM\n",
 312				   hdr->addr1);
 313#endif
 314			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
 315			return TX_DROP;
 316		}
 317	} else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
 318			    ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
 319		/*
 320		 * No associated STAs - no need to send multicast
 321		 * frames.
 322		 */
 323		return TX_DROP;
 324	}
 325
 326	return TX_CONTINUE;
 327}
 328
 329/* This function is called whenever the AP is about to exceed the maximum limit
 330 * of buffered frames for power saving STAs. This situation should not really
 331 * happen often during normal operation, so dropping the oldest buffered packet
 332 * from each queue should be OK to make some room for new frames. */
 333static void purge_old_ps_buffers(struct ieee80211_local *local)
 334{
 335	int total = 0, purged = 0;
 336	struct sk_buff *skb;
 337	struct ieee80211_sub_if_data *sdata;
 338	struct sta_info *sta;
 339
 340	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 341		struct ps_data *ps;
 342
 343		if (sdata->vif.type == NL80211_IFTYPE_AP)
 344			ps = &sdata->u.ap.ps;
 345		else if (ieee80211_vif_is_mesh(&sdata->vif))
 346			ps = &sdata->u.mesh.ps;
 347		else
 348			continue;
 349
 350		skb = skb_dequeue(&ps->bc_buf);
 351		if (skb) {
 352			purged++;
 353			ieee80211_free_txskb(&local->hw, skb);
 354		}
 355		total += skb_queue_len(&ps->bc_buf);
 356	}
 357
 358	/*
 359	 * Drop one frame from each station from the lowest-priority
 360	 * AC that has frames at all.
 361	 */
 362	list_for_each_entry_rcu(sta, &local->sta_list, list) {
 363		int ac;
 364
 365		for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
 366			skb = skb_dequeue(&sta->ps_tx_buf[ac]);
 367			total += skb_queue_len(&sta->ps_tx_buf[ac]);
 368			if (skb) {
 369				purged++;
 370				ieee80211_free_txskb(&local->hw, skb);
 371				break;
 372			}
 373		}
 374	}
 375
 376	local->total_ps_buffered = total;
 377	ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
 378}
 379
 380static ieee80211_tx_result
 381ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
 382{
 383	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 384	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 385	struct ps_data *ps;
 386
 387	/*
 388	 * broadcast/multicast frame
 389	 *
 390	 * If any of the associated/peer stations is in power save mode,
 391	 * the frame is buffered to be sent after DTIM beacon frame.
 392	 * This is done either by the hardware or us.
 393	 */
 394
 395	/* powersaving STAs currently only in AP/VLAN/mesh mode */
 396	if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
 397	    tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 398		if (!tx->sdata->bss)
 399			return TX_CONTINUE;
 400
 401		ps = &tx->sdata->bss->ps;
 402	} else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
 403		ps = &tx->sdata->u.mesh.ps;
 404	} else {
 405		return TX_CONTINUE;
 406	}
 407
 408
 409	/* no buffering for ordered frames */
 410	if (ieee80211_has_order(hdr->frame_control))
 411		return TX_CONTINUE;
 412
 413	if (ieee80211_is_probe_req(hdr->frame_control))
 414		return TX_CONTINUE;
 415
 416	if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
 417		info->hw_queue = tx->sdata->vif.cab_queue;
 418
 419	/* no stations in PS mode and no buffered packets */
 420	if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
 421		return TX_CONTINUE;
 422
 423	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
 424
 425	/* device releases frame after DTIM beacon */
 426	if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
 427		return TX_CONTINUE;
 428
 429	/* buffered in mac80211 */
 430	if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
 431		purge_old_ps_buffers(tx->local);
 432
 433	if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
 434		ps_dbg(tx->sdata,
 435		       "BC TX buffer full - dropping the oldest frame\n");
 436		ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
 437	} else
 438		tx->local->total_ps_buffered++;
 439
 440	skb_queue_tail(&ps->bc_buf, tx->skb);
 441
 442	return TX_QUEUED;
 443}
 444
 445static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
 446			     struct sk_buff *skb)
 447{
 448	if (!ieee80211_is_mgmt(fc))
 449		return 0;
 450
 451	if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
 452		return 0;
 453
 454	if (!ieee80211_is_robust_mgmt_frame(skb))
 455		return 0;
 456
 457	return 1;
 458}
 459
 460static ieee80211_tx_result
 461ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
 462{
 463	struct sta_info *sta = tx->sta;
 464	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 465	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 466	struct ieee80211_local *local = tx->local;
 467
 468	if (unlikely(!sta))
 469		return TX_CONTINUE;
 470
 471	if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
 472		      test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
 473		      test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
 474		     !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
 475		int ac = skb_get_queue_mapping(tx->skb);
 476
 477		if (ieee80211_is_mgmt(hdr->frame_control) &&
 478		    !ieee80211_is_bufferable_mmpdu(tx->skb)) {
 479			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
 480			return TX_CONTINUE;
 481		}
 482
 483		ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
 484		       sta->sta.addr, sta->sta.aid, ac);
 485		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
 486			purge_old_ps_buffers(tx->local);
 487
 488		/* sync with ieee80211_sta_ps_deliver_wakeup */
 489		spin_lock(&sta->ps_lock);
 490		/*
 491		 * STA woke up the meantime and all the frames on ps_tx_buf have
 492		 * been queued to pending queue. No reordering can happen, go
 493		 * ahead and Tx the packet.
 494		 */
 495		if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
 496		    !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
 497		    !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
 498			spin_unlock(&sta->ps_lock);
 499			return TX_CONTINUE;
 500		}
 501
 502		if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
 503			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
 504			ps_dbg(tx->sdata,
 505			       "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
 506			       sta->sta.addr, ac);
 507			ieee80211_free_txskb(&local->hw, old);
 508		} else
 509			tx->local->total_ps_buffered++;
 510
 511		info->control.jiffies = jiffies;
 512		info->control.vif = &tx->sdata->vif;
 513		info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
 514		info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
 515		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
 516		spin_unlock(&sta->ps_lock);
 517
 518		if (!timer_pending(&local->sta_cleanup))
 519			mod_timer(&local->sta_cleanup,
 520				  round_jiffies(jiffies +
 521						STA_INFO_CLEANUP_INTERVAL));
 522
 523		/*
 524		 * We queued up some frames, so the TIM bit might
 525		 * need to be set, recalculate it.
 526		 */
 527		sta_info_recalc_tim(sta);
 528
 529		return TX_QUEUED;
 530	} else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
 531		ps_dbg(tx->sdata,
 532		       "STA %pM in PS mode, but polling/in SP -> send frame\n",
 533		       sta->sta.addr);
 534	}
 535
 536	return TX_CONTINUE;
 537}
 538
 539static ieee80211_tx_result debug_noinline
 540ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
 541{
 542	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
 543		return TX_CONTINUE;
 544
 545	if (tx->flags & IEEE80211_TX_UNICAST)
 546		return ieee80211_tx_h_unicast_ps_buf(tx);
 547	else
 548		return ieee80211_tx_h_multicast_ps_buf(tx);
 549}
 550
 551static ieee80211_tx_result debug_noinline
 552ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
 553{
 554	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 555
 556	if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
 557		if (tx->sdata->control_port_no_encrypt)
 558			info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 559		info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
 560		info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
 561	}
 562
 563	return TX_CONTINUE;
 564}
 565
 566static struct ieee80211_key *
 567ieee80211_select_link_key(struct ieee80211_tx_data *tx)
 568{
 569	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 570	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 571	struct ieee80211_link_data *link;
 572	unsigned int link_id;
 573
 574	link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK);
 575	if (link_id == IEEE80211_LINK_UNSPECIFIED) {
 576		link = &tx->sdata->deflink;
 577	} else {
 578		link = rcu_dereference(tx->sdata->link[link_id]);
 579		if (!link)
 580			return NULL;
 581	}
 582
 583	if (ieee80211_is_group_privacy_action(tx->skb))
 584		return rcu_dereference(link->default_multicast_key);
 585	else if (ieee80211_is_mgmt(hdr->frame_control) &&
 586		 is_multicast_ether_addr(hdr->addr1) &&
 587		 ieee80211_is_robust_mgmt_frame(tx->skb))
 588		return rcu_dereference(link->default_mgmt_key);
 589	else if (is_multicast_ether_addr(hdr->addr1))
 590		return rcu_dereference(link->default_multicast_key);
 591
 592	return NULL;
 593}
 594
 595static ieee80211_tx_result debug_noinline
 596ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
 597{
 598	struct ieee80211_key *key;
 599	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 600	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 601
 602	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) {
 603		tx->key = NULL;
 604		return TX_CONTINUE;
 605	}
 606
 607	if (tx->sta &&
 608	    (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
 609		tx->key = key;
 610	else if ((key = ieee80211_select_link_key(tx)))
 611		tx->key = key;
 612	else if (!is_multicast_ether_addr(hdr->addr1) &&
 613		 (key = rcu_dereference(tx->sdata->default_unicast_key)))
 614		tx->key = key;
 615	else
 616		tx->key = NULL;
 617
 618	if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
 619		if (tx->key && tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
 620			info->control.hw_key = &tx->key->conf;
 621		return TX_CONTINUE;
 622	}
 623
 624	if (tx->key) {
 625		bool skip_hw = false;
 626
 627		/* TODO: add threshold stuff again */
 628
 629		switch (tx->key->conf.cipher) {
 630		case WLAN_CIPHER_SUITE_WEP40:
 631		case WLAN_CIPHER_SUITE_WEP104:
 632		case WLAN_CIPHER_SUITE_TKIP:
 633			if (!ieee80211_is_data_present(hdr->frame_control))
 634				tx->key = NULL;
 635			break;
 636		case WLAN_CIPHER_SUITE_CCMP:
 637		case WLAN_CIPHER_SUITE_CCMP_256:
 638		case WLAN_CIPHER_SUITE_GCMP:
 639		case WLAN_CIPHER_SUITE_GCMP_256:
 640			if (!ieee80211_is_data_present(hdr->frame_control) &&
 641			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
 642					       tx->skb) &&
 643			    !ieee80211_is_group_privacy_action(tx->skb))
 644				tx->key = NULL;
 645			else
 646				skip_hw = (tx->key->conf.flags &
 647					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
 648					ieee80211_is_mgmt(hdr->frame_control);
 649			break;
 650		case WLAN_CIPHER_SUITE_AES_CMAC:
 651		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
 652		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
 653		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
 654			if (!ieee80211_is_mgmt(hdr->frame_control))
 655				tx->key = NULL;
 656			break;
 657		}
 658
 659		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
 660			     !ieee80211_is_deauth(hdr->frame_control)) &&
 661			     tx->skb->protocol != tx->sdata->control_port_protocol)
 662			return TX_DROP;
 663
 664		if (!skip_hw && tx->key &&
 665		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
 666			info->control.hw_key = &tx->key->conf;
 667	} else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta &&
 668		   test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) {
 669		return TX_DROP;
 670	}
 671
 672	return TX_CONTINUE;
 673}
 674
 675static ieee80211_tx_result debug_noinline
 676ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
 677{
 678	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 679	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
 680	struct ieee80211_supported_band *sband;
 681	u32 len;
 682	struct ieee80211_tx_rate_control txrc;
 683	struct ieee80211_sta_rates *ratetbl = NULL;
 684	bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP;
 685	bool assoc = false;
 686
 687	memset(&txrc, 0, sizeof(txrc));
 688
 689	if (info->band < NUM_NL80211_BANDS)
 690		sband = tx->local->hw.wiphy->bands[info->band];
 691	else
 692		return TX_CONTINUE;
 693
 694	len = min_t(u32, tx->skb->len + FCS_LEN,
 695			 tx->local->hw.wiphy->frag_threshold);
 696
 697	/* set up the tx rate control struct we give the RC algo */
 698	txrc.hw = &tx->local->hw;
 699	txrc.sband = sband;
 700	txrc.bss_conf = &tx->sdata->vif.bss_conf;
 701	txrc.skb = tx->skb;
 702	txrc.reported_rate.idx = -1;
 703
 704	if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) {
 705		txrc.rate_idx_mask = ~0;
 706	} else {
 707		txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
 708
 709		if (tx->sdata->rc_has_mcs_mask[info->band])
 710			txrc.rate_idx_mcs_mask =
 711				tx->sdata->rc_rateidx_mcs_mask[info->band];
 712	}
 713
 714	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
 715		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
 716		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
 717		    tx->sdata->vif.type == NL80211_IFTYPE_OCB);
 718
 719	/* set up RTS protection if desired */
 720	if (len > tx->local->hw.wiphy->rts_threshold) {
 721		txrc.rts = true;
 722	}
 723
 724	info->control.use_rts = txrc.rts;
 725	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
 726
 727	/*
 728	 * Use short preamble if the BSS can handle it, but not for
 729	 * management frames unless we know the receiver can handle
 730	 * that -- the management frame might be to a station that
 731	 * just wants a probe response.
 732	 */
 733	if (tx->sdata->vif.bss_conf.use_short_preamble &&
 734	    (ieee80211_is_tx_data(tx->skb) ||
 735	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
 736		txrc.short_preamble = true;
 737
 738	info->control.short_preamble = txrc.short_preamble;
 739
 740	/* don't ask rate control when rate already injected via radiotap */
 741	if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
 742		return TX_CONTINUE;
 743
 744	if (tx->sta)
 745		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
 746
 747	/*
 748	 * Lets not bother rate control if we're associated and cannot
 749	 * talk to the sta. This should not happen.
 750	 */
 751	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
 752		 !rate_usable_index_exists(sband, &tx->sta->sta),
 753		 "%s: Dropped data frame as no usable bitrate found while "
 754		 "scanning and associated. Target station: "
 755		 "%pM on %d GHz band\n",
 756		 tx->sdata->name,
 757		 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1,
 758		 info->band ? 5 : 2))
 759		return TX_DROP;
 760
 761	/*
 762	 * If we're associated with the sta at this point we know we can at
 763	 * least send the frame at the lowest bit rate.
 764	 */
 765	rate_control_get_rate(tx->sdata, tx->sta, &txrc);
 766
 767	if (tx->sta && !info->control.skip_table)
 768		ratetbl = rcu_dereference(tx->sta->sta.rates);
 769
 770	if (unlikely(info->control.rates[0].idx < 0)) {
 771		if (ratetbl) {
 772			struct ieee80211_tx_rate rate = {
 773				.idx = ratetbl->rate[0].idx,
 774				.flags = ratetbl->rate[0].flags,
 775				.count = ratetbl->rate[0].count
 776			};
 777
 778			if (ratetbl->rate[0].idx < 0)
 779				return TX_DROP;
 780
 781			tx->rate = rate;
 782		} else {
 783			return TX_DROP;
 784		}
 785	} else {
 786		tx->rate = info->control.rates[0];
 787	}
 788
 789	if (txrc.reported_rate.idx < 0) {
 790		txrc.reported_rate = tx->rate;
 791		if (tx->sta && ieee80211_is_tx_data(tx->skb))
 792			tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
 793	} else if (tx->sta)
 794		tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
 795
 796	if (ratetbl)
 797		return TX_CONTINUE;
 798
 799	if (unlikely(!info->control.rates[0].count))
 800		info->control.rates[0].count = 1;
 801
 802	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
 803			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
 804		info->control.rates[0].count = 1;
 805
 806	return TX_CONTINUE;
 807}
 808
 809static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
 810{
 811	u16 *seq = &sta->tid_seq[tid];
 812	__le16 ret = cpu_to_le16(*seq);
 813
 814	/* Increase the sequence number. */
 815	*seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
 816
 817	return ret;
 818}
 819
 820static ieee80211_tx_result debug_noinline
 821ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
 822{
 823	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 824	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 825	int tid;
 826
 827	/*
 828	 * Packet injection may want to control the sequence
 829	 * number, if we have no matching interface then we
 830	 * neither assign one ourselves nor ask the driver to.
 831	 */
 832	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
 833		return TX_CONTINUE;
 834
 835	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
 836		return TX_CONTINUE;
 837
 838	if (ieee80211_hdrlen(hdr->frame_control) < 24)
 839		return TX_CONTINUE;
 840
 841	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
 842		return TX_CONTINUE;
 843
 844	if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO)
 845		return TX_CONTINUE;
 846
 847	/* SNS11 from 802.11be 10.3.2.14 */
 848	if (unlikely(is_multicast_ether_addr(hdr->addr1) &&
 849		     ieee80211_vif_is_mld(info->control.vif) &&
 850		     info->control.vif->type == NL80211_IFTYPE_AP)) {
 851		if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX)
 852			tx->sdata->mld_mcast_seq += 0x10;
 853		hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq);
 854		return TX_CONTINUE;
 855	}
 856
 857	/*
 858	 * Anything but QoS data that has a sequence number field
 859	 * (is long enough) gets a sequence number from the global
 860	 * counter.  QoS data frames with a multicast destination
 861	 * also use the global counter (802.11-2012 9.3.2.10).
 862	 */
 863	if (!ieee80211_is_data_qos(hdr->frame_control) ||
 864	    is_multicast_ether_addr(hdr->addr1)) {
 865		/* driver should assign sequence number */
 866		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
 867		/* for pure STA mode without beacons, we can do it */
 868		hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
 869		tx->sdata->sequence_number += 0x10;
 870		if (tx->sta)
 871			tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++;
 872		return TX_CONTINUE;
 873	}
 874
 875	/*
 876	 * This should be true for injected/management frames only, for
 877	 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
 878	 * above since they are not QoS-data frames.
 879	 */
 880	if (!tx->sta)
 881		return TX_CONTINUE;
 882
 883	/* include per-STA, per-TID sequence counter */
 884	tid = ieee80211_get_tid(hdr);
 885	tx->sta->deflink.tx_stats.msdu[tid]++;
 886
 887	hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
 888
 889	return TX_CONTINUE;
 890}
 891
 892static int ieee80211_fragment(struct ieee80211_tx_data *tx,
 893			      struct sk_buff *skb, int hdrlen,
 894			      int frag_threshold)
 895{
 896	struct ieee80211_local *local = tx->local;
 897	struct ieee80211_tx_info *info;
 898	struct sk_buff *tmp;
 899	int per_fragm = frag_threshold - hdrlen - FCS_LEN;
 900	int pos = hdrlen + per_fragm;
 901	int rem = skb->len - hdrlen - per_fragm;
 902
 903	if (WARN_ON(rem < 0))
 904		return -EINVAL;
 905
 906	/* first fragment was already added to queue by caller */
 907
 908	while (rem) {
 909		int fraglen = per_fragm;
 910
 911		if (fraglen > rem)
 912			fraglen = rem;
 913		rem -= fraglen;
 914		tmp = dev_alloc_skb(local->tx_headroom +
 915				    frag_threshold +
 916				    IEEE80211_ENCRYPT_HEADROOM +
 917				    IEEE80211_ENCRYPT_TAILROOM);
 918		if (!tmp)
 919			return -ENOMEM;
 920
 921		__skb_queue_tail(&tx->skbs, tmp);
 922
 923		skb_reserve(tmp,
 924			    local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM);
 925
 926		/* copy control information */
 927		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
 928
 929		info = IEEE80211_SKB_CB(tmp);
 930		info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
 931				 IEEE80211_TX_CTL_FIRST_FRAGMENT);
 932
 933		if (rem)
 934			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
 935
 936		skb_copy_queue_mapping(tmp, skb);
 937		tmp->priority = skb->priority;
 938		tmp->dev = skb->dev;
 939
 940		/* copy header and data */
 941		skb_put_data(tmp, skb->data, hdrlen);
 942		skb_put_data(tmp, skb->data + pos, fraglen);
 943
 944		pos += fraglen;
 945	}
 946
 947	/* adjust first fragment's length */
 948	skb_trim(skb, hdrlen + per_fragm);
 949	return 0;
 950}
 951
 952static ieee80211_tx_result debug_noinline
 953ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
 954{
 955	struct sk_buff *skb = tx->skb;
 956	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 957	struct ieee80211_hdr *hdr = (void *)skb->data;
 958	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
 959	int hdrlen;
 960	int fragnum;
 961
 962	/* no matter what happens, tx->skb moves to tx->skbs */
 963	__skb_queue_tail(&tx->skbs, skb);
 964	tx->skb = NULL;
 965
 966	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
 967		return TX_CONTINUE;
 968
 969	if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
 970		return TX_CONTINUE;
 971
 972	/*
 973	 * Warn when submitting a fragmented A-MPDU frame and drop it.
 974	 * This scenario is handled in ieee80211_tx_prepare but extra
 975	 * caution taken here as fragmented ampdu may cause Tx stop.
 976	 */
 977	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
 978		return TX_DROP;
 979
 980	hdrlen = ieee80211_hdrlen(hdr->frame_control);
 981
 982	/* internal error, why isn't DONTFRAG set? */
 983	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
 984		return TX_DROP;
 985
 986	/*
 987	 * Now fragment the frame. This will allocate all the fragments and
 988	 * chain them (using skb as the first fragment) to skb->next.
 989	 * During transmission, we will remove the successfully transmitted
 990	 * fragments from this list. When the low-level driver rejects one
 991	 * of the fragments then we will simply pretend to accept the skb
 992	 * but store it away as pending.
 993	 */
 994	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
 995		return TX_DROP;
 996
 997	/* update duration/seq/flags of fragments */
 998	fragnum = 0;
 999
1000	skb_queue_walk(&tx->skbs, skb) {
1001		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
1002
1003		hdr = (void *)skb->data;
1004		info = IEEE80211_SKB_CB(skb);
1005
1006		if (!skb_queue_is_last(&tx->skbs, skb)) {
1007			hdr->frame_control |= morefrags;
1008			/*
1009			 * No multi-rate retries for fragmented frames, that
1010			 * would completely throw off the NAV at other STAs.
1011			 */
1012			info->control.rates[1].idx = -1;
1013			info->control.rates[2].idx = -1;
1014			info->control.rates[3].idx = -1;
1015			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
1016			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1017		} else {
1018			hdr->frame_control &= ~morefrags;
1019		}
1020		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
1021		fragnum++;
1022	}
1023
1024	return TX_CONTINUE;
1025}
1026
1027static ieee80211_tx_result debug_noinline
1028ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1029{
1030	struct sk_buff *skb;
1031	int ac = -1;
1032
1033	if (!tx->sta)
1034		return TX_CONTINUE;
1035
1036	skb_queue_walk(&tx->skbs, skb) {
1037		ac = skb_get_queue_mapping(skb);
1038		tx->sta->deflink.tx_stats.bytes[ac] += skb->len;
1039	}
1040	if (ac >= 0)
1041		tx->sta->deflink.tx_stats.packets[ac]++;
1042
1043	return TX_CONTINUE;
1044}
1045
1046static ieee80211_tx_result debug_noinline
1047ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1048{
1049	if (!tx->key)
1050		return TX_CONTINUE;
1051
1052	switch (tx->key->conf.cipher) {
1053	case WLAN_CIPHER_SUITE_WEP40:
1054	case WLAN_CIPHER_SUITE_WEP104:
1055		return ieee80211_crypto_wep_encrypt(tx);
1056	case WLAN_CIPHER_SUITE_TKIP:
1057		return ieee80211_crypto_tkip_encrypt(tx);
1058	case WLAN_CIPHER_SUITE_CCMP:
1059		return ieee80211_crypto_ccmp_encrypt(
1060			tx, IEEE80211_CCMP_MIC_LEN);
1061	case WLAN_CIPHER_SUITE_CCMP_256:
1062		return ieee80211_crypto_ccmp_encrypt(
1063			tx, IEEE80211_CCMP_256_MIC_LEN);
1064	case WLAN_CIPHER_SUITE_AES_CMAC:
1065		return ieee80211_crypto_aes_cmac_encrypt(
1066			tx, IEEE80211_CMAC_128_MIC_LEN);
1067	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1068		return ieee80211_crypto_aes_cmac_encrypt(
1069			tx, IEEE80211_CMAC_256_MIC_LEN);
1070	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1071	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1072		return ieee80211_crypto_aes_gmac_encrypt(tx);
1073	case WLAN_CIPHER_SUITE_GCMP:
1074	case WLAN_CIPHER_SUITE_GCMP_256:
1075		return ieee80211_crypto_gcmp_encrypt(tx);
1076	}
1077
1078	return TX_DROP;
1079}
1080
1081static ieee80211_tx_result debug_noinline
1082ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1083{
1084	struct sk_buff *skb;
1085	struct ieee80211_hdr *hdr;
1086	int next_len;
1087	bool group_addr;
1088
1089	skb_queue_walk(&tx->skbs, skb) {
1090		hdr = (void *) skb->data;
1091		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1092			break; /* must not overwrite AID */
1093		if (!skb_queue_is_last(&tx->skbs, skb)) {
1094			struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1095			next_len = next->len;
1096		} else
1097			next_len = 0;
1098		group_addr = is_multicast_ether_addr(hdr->addr1);
1099
1100		hdr->duration_id =
1101			ieee80211_duration(tx, skb, group_addr, next_len);
1102	}
1103
1104	return TX_CONTINUE;
1105}
1106
1107/* actual transmit path */
1108
1109static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1110				  struct sk_buff *skb,
1111				  struct ieee80211_tx_info *info,
1112				  struct tid_ampdu_tx *tid_tx,
1113				  int tid)
1114{
1115	bool queued = false;
1116	bool reset_agg_timer = false;
1117	struct sk_buff *purge_skb = NULL;
1118
1119	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1120		reset_agg_timer = true;
1121	} else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1122		/*
1123		 * nothing -- this aggregation session is being started
1124		 * but that might still fail with the driver
1125		 */
1126	} else if (!tx->sta->sta.txq[tid]) {
1127		spin_lock(&tx->sta->lock);
1128		/*
1129		 * Need to re-check now, because we may get here
1130		 *
1131		 *  1) in the window during which the setup is actually
1132		 *     already done, but not marked yet because not all
1133		 *     packets are spliced over to the driver pending
1134		 *     queue yet -- if this happened we acquire the lock
1135		 *     either before or after the splice happens, but
1136		 *     need to recheck which of these cases happened.
1137		 *
1138		 *  2) during session teardown, if the OPERATIONAL bit
1139		 *     was cleared due to the teardown but the pointer
1140		 *     hasn't been assigned NULL yet (or we loaded it
1141		 *     before it was assigned) -- in this case it may
1142		 *     now be NULL which means we should just let the
1143		 *     packet pass through because splicing the frames
1144		 *     back is already done.
1145		 */
1146		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1147
1148		if (!tid_tx) {
1149			/* do nothing, let packet pass through */
1150		} else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1151			reset_agg_timer = true;
1152		} else {
1153			queued = true;
1154			if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1155				clear_sta_flag(tx->sta, WLAN_STA_SP);
1156				ps_dbg(tx->sta->sdata,
1157				       "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1158				       tx->sta->sta.addr, tx->sta->sta.aid);
1159			}
1160			info->control.vif = &tx->sdata->vif;
1161			info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1162			info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1163			__skb_queue_tail(&tid_tx->pending, skb);
1164			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1165				purge_skb = __skb_dequeue(&tid_tx->pending);
1166		}
1167		spin_unlock(&tx->sta->lock);
1168
1169		if (purge_skb)
1170			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1171	}
1172
1173	/* reset session timer */
1174	if (reset_agg_timer)
1175		tid_tx->last_tx = jiffies;
1176
1177	return queued;
1178}
1179
1180void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata,
1181			  struct sta_info *sta, struct sk_buff *skb)
1182{
1183	struct rate_control_ref *ref = sdata->local->rate_ctrl;
1184	u16 tid;
1185
1186	if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER))
1187		return;
1188
1189	if (!sta ||
1190	    (!sta->sta.valid_links && !sta->sta.deflink.ht_cap.ht_supported &&
1191	     !sta->sta.deflink.s1g_cap.s1g) ||
1192	    !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO ||
1193	    skb->protocol == sdata->control_port_protocol)
1194		return;
1195
1196	tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1197	if (likely(sta->ampdu_mlme.tid_tx[tid]))
1198		return;
1199
1200	ieee80211_start_tx_ba_session(&sta->sta, tid, 0);
1201}
1202
1203/*
1204 * initialises @tx
1205 * pass %NULL for the station if unknown, a valid pointer if known
1206 * or an ERR_PTR() if the station is known not to exist
1207 */
1208static ieee80211_tx_result
1209ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1210		     struct ieee80211_tx_data *tx,
1211		     struct sta_info *sta, struct sk_buff *skb)
1212{
1213	struct ieee80211_local *local = sdata->local;
1214	struct ieee80211_hdr *hdr;
1215	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1216	bool aggr_check = false;
1217	int tid;
1218
1219	memset(tx, 0, sizeof(*tx));
1220	tx->skb = skb;
1221	tx->local = local;
1222	tx->sdata = sdata;
1223	__skb_queue_head_init(&tx->skbs);
1224
1225	/*
1226	 * If this flag is set to true anywhere, and we get here,
1227	 * we are doing the needed processing, so remove the flag
1228	 * now.
1229	 */
1230	info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1231
1232	hdr = (struct ieee80211_hdr *) skb->data;
1233
1234	if (likely(sta)) {
1235		if (!IS_ERR(sta))
1236			tx->sta = sta;
1237	} else {
1238		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1239			tx->sta = rcu_dereference(sdata->u.vlan.sta);
1240			if (!tx->sta && sdata->wdev.use_4addr)
1241				return TX_DROP;
1242		} else if (tx->sdata->control_port_protocol == tx->skb->protocol) {
1243			tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1244		}
1245		if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) {
1246			tx->sta = sta_info_get(sdata, hdr->addr1);
1247			aggr_check = true;
1248		}
1249	}
1250
1251	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1252	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1253	    ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1254	    !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1255		struct tid_ampdu_tx *tid_tx;
1256
1257		tid = ieee80211_get_tid(hdr);
1258		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1259		if (!tid_tx && aggr_check) {
1260			ieee80211_aggr_check(sdata, tx->sta, skb);
1261			tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1262		}
1263
1264		if (tid_tx) {
1265			bool queued;
1266
1267			queued = ieee80211_tx_prep_agg(tx, skb, info,
1268						       tid_tx, tid);
1269
1270			if (unlikely(queued))
1271				return TX_QUEUED;
1272		}
1273	}
1274
1275	if (is_multicast_ether_addr(hdr->addr1)) {
1276		tx->flags &= ~IEEE80211_TX_UNICAST;
1277		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1278	} else
1279		tx->flags |= IEEE80211_TX_UNICAST;
1280
1281	if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1282		if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1283		    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1284		    info->flags & IEEE80211_TX_CTL_AMPDU)
1285			info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1286	}
1287
1288	if (!tx->sta)
1289		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1290	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1291		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1292		ieee80211_check_fast_xmit(tx->sta);
1293	}
1294
1295	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1296
1297	return TX_CONTINUE;
1298}
1299
1300static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1301					  struct ieee80211_vif *vif,
1302					  struct sta_info *sta,
1303					  struct sk_buff *skb)
1304{
1305	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1306	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1307	struct ieee80211_txq *txq = NULL;
1308
1309	if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1310	    (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1311		return NULL;
1312
1313	if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
1314	    unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
1315		if ((!ieee80211_is_mgmt(hdr->frame_control) ||
1316		     ieee80211_is_bufferable_mmpdu(skb) ||
1317		     vif->type == NL80211_IFTYPE_STATION) &&
1318		    sta && sta->uploaded) {
1319			/*
1320			 * This will be NULL if the driver didn't set the
1321			 * opt-in hardware flag.
1322			 */
1323			txq = sta->sta.txq[IEEE80211_NUM_TIDS];
1324		}
1325	} else if (sta) {
1326		u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1327
1328		if (!sta->uploaded)
1329			return NULL;
1330
1331		txq = sta->sta.txq[tid];
1332	} else {
1333		txq = vif->txq;
1334	}
1335
1336	if (!txq)
1337		return NULL;
1338
1339	return to_txq_info(txq);
1340}
1341
1342static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1343{
1344	struct sk_buff *next;
1345	codel_time_t now = codel_get_time();
1346
1347	skb_list_walk_safe(skb, skb, next)
1348		IEEE80211_SKB_CB(skb)->control.enqueue_time = now;
1349}
1350
1351static u32 codel_skb_len_func(const struct sk_buff *skb)
1352{
1353	return skb->len;
1354}
1355
1356static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1357{
1358	const struct ieee80211_tx_info *info;
1359
1360	info = (const struct ieee80211_tx_info *)skb->cb;
1361	return info->control.enqueue_time;
1362}
1363
1364static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1365					  void *ctx)
1366{
1367	struct ieee80211_local *local;
1368	struct txq_info *txqi;
1369	struct fq *fq;
1370	struct fq_flow *flow;
1371
1372	txqi = ctx;
1373	local = vif_to_sdata(txqi->txq.vif)->local;
1374	fq = &local->fq;
1375
1376	if (cvars == &txqi->def_cvars)
1377		flow = &txqi->tin.default_flow;
1378	else
1379		flow = &fq->flows[cvars - local->cvars];
1380
1381	return fq_flow_dequeue(fq, flow);
1382}
1383
1384static void codel_drop_func(struct sk_buff *skb,
1385			    void *ctx)
1386{
1387	struct ieee80211_local *local;
1388	struct ieee80211_hw *hw;
1389	struct txq_info *txqi;
1390
1391	txqi = ctx;
1392	local = vif_to_sdata(txqi->txq.vif)->local;
1393	hw = &local->hw;
1394
1395	ieee80211_free_txskb(hw, skb);
1396}
1397
1398static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1399					   struct fq_tin *tin,
1400					   struct fq_flow *flow)
1401{
1402	struct ieee80211_local *local;
1403	struct txq_info *txqi;
1404	struct codel_vars *cvars;
1405	struct codel_params *cparams;
1406	struct codel_stats *cstats;
1407
1408	local = container_of(fq, struct ieee80211_local, fq);
1409	txqi = container_of(tin, struct txq_info, tin);
1410	cparams = &local->cparams;
1411	cstats = &txqi->cstats;
1412
1413	if (flow == &tin->default_flow)
1414		cvars = &txqi->def_cvars;
1415	else
1416		cvars = &local->cvars[flow - fq->flows];
1417
1418	return codel_dequeue(txqi,
1419			     &flow->backlog,
1420			     cparams,
1421			     cvars,
1422			     cstats,
1423			     codel_skb_len_func,
1424			     codel_skb_time_func,
1425			     codel_drop_func,
1426			     codel_dequeue_func);
1427}
1428
1429static void fq_skb_free_func(struct fq *fq,
1430			     struct fq_tin *tin,
1431			     struct fq_flow *flow,
1432			     struct sk_buff *skb)
1433{
1434	struct ieee80211_local *local;
1435
1436	local = container_of(fq, struct ieee80211_local, fq);
1437	ieee80211_free_txskb(&local->hw, skb);
1438}
1439
1440static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1441				  struct txq_info *txqi,
1442				  struct sk_buff *skb)
1443{
1444	struct fq *fq = &local->fq;
1445	struct fq_tin *tin = &txqi->tin;
1446	u32 flow_idx;
1447
1448	ieee80211_set_skb_enqueue_time(skb);
1449
1450	spin_lock_bh(&fq->lock);
1451	/*
1452	 * For management frames, don't really apply codel etc.,
1453	 * we don't want to apply any shaping or anything we just
1454	 * want to simplify the driver API by having them on the
1455	 * txqi.
1456	 */
1457	if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) {
1458		IEEE80211_SKB_CB(skb)->control.flags |=
1459			IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1460		__skb_queue_tail(&txqi->frags, skb);
1461	} else {
1462		flow_idx = fq_flow_idx(fq, skb);
1463		fq_tin_enqueue(fq, tin, flow_idx, skb,
1464			       fq_skb_free_func);
1465	}
1466	spin_unlock_bh(&fq->lock);
1467}
1468
1469static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1470				struct fq_flow *flow, struct sk_buff *skb,
1471				void *data)
1472{
1473	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1474
1475	return info->control.vif == data;
1476}
1477
1478void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1479			       struct ieee80211_sub_if_data *sdata)
1480{
1481	struct fq *fq = &local->fq;
1482	struct txq_info *txqi;
1483	struct fq_tin *tin;
1484	struct ieee80211_sub_if_data *ap;
1485
1486	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1487		return;
1488
1489	ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1490
1491	if (!ap->vif.txq)
1492		return;
1493
1494	txqi = to_txq_info(ap->vif.txq);
1495	tin = &txqi->tin;
1496
1497	spin_lock_bh(&fq->lock);
1498	fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1499		      fq_skb_free_func);
1500	spin_unlock_bh(&fq->lock);
1501}
1502
1503void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1504			struct sta_info *sta,
1505			struct txq_info *txqi, int tid)
1506{
1507	fq_tin_init(&txqi->tin);
1508	codel_vars_init(&txqi->def_cvars);
1509	codel_stats_init(&txqi->cstats);
1510	__skb_queue_head_init(&txqi->frags);
1511	INIT_LIST_HEAD(&txqi->schedule_order);
1512
1513	txqi->txq.vif = &sdata->vif;
1514
1515	if (!sta) {
1516		sdata->vif.txq = &txqi->txq;
1517		txqi->txq.tid = 0;
1518		txqi->txq.ac = IEEE80211_AC_BE;
1519
1520		return;
1521	}
1522
1523	if (tid == IEEE80211_NUM_TIDS) {
1524		if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1525			/* Drivers need to opt in to the management MPDU TXQ */
1526			if (!ieee80211_hw_check(&sdata->local->hw,
1527						STA_MMPDU_TXQ))
1528				return;
1529		} else if (!ieee80211_hw_check(&sdata->local->hw,
1530					       BUFF_MMPDU_TXQ)) {
1531			/* Drivers need to opt in to the bufferable MMPDU TXQ */
1532			return;
1533		}
1534		txqi->txq.ac = IEEE80211_AC_VO;
1535	} else {
1536		txqi->txq.ac = ieee80211_ac_from_tid(tid);
1537	}
1538
1539	txqi->txq.sta = &sta->sta;
1540	txqi->txq.tid = tid;
1541	sta->sta.txq[tid] = &txqi->txq;
1542}
1543
1544void ieee80211_txq_purge(struct ieee80211_local *local,
1545			 struct txq_info *txqi)
1546{
1547	struct fq *fq = &local->fq;
1548	struct fq_tin *tin = &txqi->tin;
1549
1550	spin_lock_bh(&fq->lock);
1551	fq_tin_reset(fq, tin, fq_skb_free_func);
1552	ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1553	spin_unlock_bh(&fq->lock);
1554
1555	spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]);
1556	list_del_init(&txqi->schedule_order);
1557	spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]);
1558}
1559
1560void ieee80211_txq_set_params(struct ieee80211_local *local, int radio_idx)
1561{
1562	if (local->hw.wiphy->txq_limit)
1563		local->fq.limit = local->hw.wiphy->txq_limit;
1564	else
1565		local->hw.wiphy->txq_limit = local->fq.limit;
1566
1567	if (local->hw.wiphy->txq_memory_limit)
1568		local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1569	else
1570		local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1571
1572	if (local->hw.wiphy->txq_quantum)
1573		local->fq.quantum = local->hw.wiphy->txq_quantum;
1574	else
1575		local->hw.wiphy->txq_quantum = local->fq.quantum;
1576}
1577
1578int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1579{
1580	struct fq *fq = &local->fq;
1581	int ret;
1582	int i;
1583	bool supp_vht = false;
1584	enum nl80211_band band;
1585
1586	ret = fq_init(fq, 4096);
1587	if (ret)
1588		return ret;
1589
1590	/*
1591	 * If the hardware doesn't support VHT, it is safe to limit the maximum
1592	 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1593	 */
1594	for (band = 0; band < NUM_NL80211_BANDS; band++) {
1595		struct ieee80211_supported_band *sband;
1596
1597		sband = local->hw.wiphy->bands[band];
1598		if (!sband)
1599			continue;
1600
1601		supp_vht = supp_vht || sband->vht_cap.vht_supported;
1602	}
1603
1604	if (!supp_vht)
1605		fq->memory_limit = 4 << 20; /* 4 Mbytes */
1606
1607	codel_params_init(&local->cparams);
1608	local->cparams.interval = MS2TIME(100);
1609	local->cparams.target = MS2TIME(20);
1610	local->cparams.ecn = true;
1611
1612	local->cvars = kvcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1613				GFP_KERNEL);
1614	if (!local->cvars) {
1615		spin_lock_bh(&fq->lock);
1616		fq_reset(fq, fq_skb_free_func);
1617		spin_unlock_bh(&fq->lock);
1618		return -ENOMEM;
1619	}
1620
1621	for (i = 0; i < fq->flows_cnt; i++)
1622		codel_vars_init(&local->cvars[i]);
1623
1624	ieee80211_txq_set_params(local, -1);
1625
1626	return 0;
1627}
1628
1629void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1630{
1631	struct fq *fq = &local->fq;
1632
1633	kvfree(local->cvars);
1634	local->cvars = NULL;
1635
1636	spin_lock_bh(&fq->lock);
1637	fq_reset(fq, fq_skb_free_func);
1638	spin_unlock_bh(&fq->lock);
1639}
1640
1641static bool ieee80211_queue_skb(struct ieee80211_local *local,
1642				struct ieee80211_sub_if_data *sdata,
1643				struct sta_info *sta,
1644				struct sk_buff *skb)
1645{
1646	struct ieee80211_vif *vif;
1647	struct txq_info *txqi;
1648
1649	if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1650		return false;
1651
1652	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1653		sdata = container_of(sdata->bss,
1654				     struct ieee80211_sub_if_data, u.ap);
1655
1656	vif = &sdata->vif;
1657	txqi = ieee80211_get_txq(local, vif, sta, skb);
1658
1659	if (!txqi)
1660		return false;
1661
1662	ieee80211_txq_enqueue(local, txqi, skb);
1663
1664	schedule_and_wake_txq(local, txqi);
1665
1666	return true;
1667}
1668
1669static bool ieee80211_tx_frags(struct ieee80211_local *local,
1670			       struct ieee80211_vif *vif,
1671			       struct sta_info *sta,
1672			       struct sk_buff_head *skbs,
1673			       bool txpending)
1674{
1675	struct ieee80211_tx_control control = {};
1676	struct sk_buff *skb, *tmp;
1677	unsigned long flags;
1678
1679	skb_queue_walk_safe(skbs, skb, tmp) {
1680		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1681		int q = info->hw_queue;
1682
1683#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1684		if (WARN_ON_ONCE(q >= local->hw.queues)) {
1685			__skb_unlink(skb, skbs);
1686			ieee80211_free_txskb(&local->hw, skb);
1687			continue;
1688		}
1689#endif
1690
1691		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1692		if (local->queue_stop_reasons[q] ||
1693		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1694			if (unlikely(info->flags &
1695				     IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1696				if (local->queue_stop_reasons[q] &
1697				    ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1698					/*
1699					 * Drop off-channel frames if queues
1700					 * are stopped for any reason other
1701					 * than off-channel operation. Never
1702					 * queue them.
1703					 */
1704					spin_unlock_irqrestore(
1705						&local->queue_stop_reason_lock,
1706						flags);
1707					ieee80211_purge_tx_queue(&local->hw,
1708								 skbs);
1709					return true;
1710				}
1711			} else {
1712
1713				/*
1714				 * Since queue is stopped, queue up frames for
1715				 * later transmission from the tx-pending
1716				 * tasklet when the queue is woken again.
1717				 */
1718				if (txpending)
1719					skb_queue_splice_init(skbs,
1720							      &local->pending[q]);
1721				else
1722					skb_queue_splice_tail_init(skbs,
1723								   &local->pending[q]);
1724
1725				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1726						       flags);
1727				return false;
1728			}
1729		}
1730		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1731
1732		info->control.vif = vif;
1733		control.sta = sta ? &sta->sta : NULL;
1734
1735		__skb_unlink(skb, skbs);
1736		drv_tx(local, &control, skb);
1737	}
1738
1739	return true;
1740}
1741
1742/*
1743 * Returns false if the frame couldn't be transmitted but was queued instead.
1744 */
1745static bool __ieee80211_tx(struct ieee80211_local *local,
1746			   struct sk_buff_head *skbs, struct sta_info *sta,
1747			   bool txpending)
1748{
1749	struct ieee80211_tx_info *info;
1750	struct ieee80211_sub_if_data *sdata;
1751	struct ieee80211_vif *vif;
1752	struct sk_buff *skb;
1753	bool result;
1754
1755	if (WARN_ON(skb_queue_empty(skbs)))
1756		return true;
1757
1758	skb = skb_peek(skbs);
1759	info = IEEE80211_SKB_CB(skb);
1760	sdata = vif_to_sdata(info->control.vif);
1761	if (sta && !sta->uploaded)
1762		sta = NULL;
1763
1764	switch (sdata->vif.type) {
1765	case NL80211_IFTYPE_MONITOR:
1766		if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) ||
1767		    ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) {
1768			vif = &sdata->vif;
1769			break;
1770		}
1771		sdata = rcu_dereference(local->monitor_sdata);
1772		if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) {
1773			vif = &sdata->vif;
1774			info->hw_queue =
1775				vif->hw_queue[skb_get_queue_mapping(skb)];
1776		} else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1777			ieee80211_purge_tx_queue(&local->hw, skbs);
1778			return true;
1779		} else
1780			vif = NULL;
1781		break;
1782	case NL80211_IFTYPE_AP_VLAN:
1783		sdata = container_of(sdata->bss,
1784				     struct ieee80211_sub_if_data, u.ap);
1785		fallthrough;
1786	default:
1787		vif = &sdata->vif;
1788		break;
1789	}
1790
1791	result = ieee80211_tx_frags(local, vif, sta, skbs, txpending);
1792
1793	WARN_ON_ONCE(!skb_queue_empty(skbs));
1794
1795	return result;
1796}
1797
1798/*
1799 * Invoke TX handlers, return 0 on success and non-zero if the
1800 * frame was dropped or queued.
1801 *
1802 * The handlers are split into an early and late part. The latter is everything
1803 * that can be sensitive to reordering, and will be deferred to after packets
1804 * are dequeued from the intermediate queues (when they are enabled).
1805 */
1806static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1807{
1808	ieee80211_tx_result res = TX_DROP;
1809
1810#define CALL_TXH(txh) \
1811	do {				\
1812		res = txh(tx);		\
1813		if (res != TX_CONTINUE)	\
1814			goto txh_done;	\
1815	} while (0)
1816
1817	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1818	CALL_TXH(ieee80211_tx_h_check_assoc);
1819	CALL_TXH(ieee80211_tx_h_ps_buf);
1820	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1821	CALL_TXH(ieee80211_tx_h_select_key);
1822
1823 txh_done:
1824	if (unlikely(res == TX_DROP)) {
1825		tx->sdata->tx_handlers_drop++;
1826		if (tx->skb)
1827			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1828		else
1829			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1830		return -1;
1831	} else if (unlikely(res == TX_QUEUED)) {
1832		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1833		return -1;
1834	}
1835
1836	return 0;
1837}
1838
1839/*
1840 * Late handlers can be called while the sta lock is held. Handlers that can
1841 * cause packets to be generated will cause deadlock!
1842 */
1843static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1844{
1845	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1846	ieee80211_tx_result res = TX_CONTINUE;
1847
1848	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1849		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1850
1851	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1852		__skb_queue_tail(&tx->skbs, tx->skb);
1853		tx->skb = NULL;
1854		goto txh_done;
1855	}
1856
1857	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1858	CALL_TXH(ieee80211_tx_h_sequence);
1859	CALL_TXH(ieee80211_tx_h_fragment);
1860	/* handlers after fragment must be aware of tx info fragmentation! */
1861	CALL_TXH(ieee80211_tx_h_stats);
1862	CALL_TXH(ieee80211_tx_h_encrypt);
1863	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1864		CALL_TXH(ieee80211_tx_h_calculate_duration);
1865#undef CALL_TXH
1866
1867 txh_done:
1868	if (unlikely(res == TX_DROP)) {
1869		tx->sdata->tx_handlers_drop++;
1870		if (tx->skb)
1871			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1872		else
1873			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1874		return -1;
1875	} else if (unlikely(res == TX_QUEUED)) {
1876		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1877		return -1;
1878	}
1879
1880	return 0;
1881}
1882
1883static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1884{
1885	int r = invoke_tx_handlers_early(tx);
1886
1887	if (r)
1888		return r;
1889	return invoke_tx_handlers_late(tx);
1890}
1891
1892bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1893			      struct ieee80211_vif *vif, struct sk_buff *skb,
1894			      int band, struct ieee80211_sta **sta)
1895{
1896	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1897	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1898	struct ieee80211_tx_data tx;
1899	struct sk_buff *skb2;
1900
1901	if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) {
1902		kfree_skb(skb);
1903		return false;
1904	}
1905
1906	info->band = band;
1907	info->control.vif = vif;
1908	info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1909
1910	if (invoke_tx_handlers(&tx))
1911		return false;
1912
1913	if (sta) {
1914		if (tx.sta)
1915			*sta = &tx.sta->sta;
1916		else
1917			*sta = NULL;
1918	}
1919
1920	/* this function isn't suitable for fragmented data frames */
1921	skb2 = __skb_dequeue(&tx.skbs);
1922	if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1923		ieee80211_free_txskb(hw, skb2);
1924		ieee80211_purge_tx_queue(hw, &tx.skbs);
1925		return false;
1926	}
1927
1928	return true;
1929}
1930EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1931
1932/*
1933 * Returns false if the frame couldn't be transmitted but was queued instead.
1934 */
1935static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1936			 struct sta_info *sta, struct sk_buff *skb,
1937			 bool txpending)
1938{
1939	struct ieee80211_local *local = sdata->local;
1940	struct ieee80211_tx_data tx;
1941	ieee80211_tx_result res_prepare;
1942	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1943	bool result = true;
1944
1945	if (unlikely(skb->len < 10)) {
1946		dev_kfree_skb(skb);
1947		return true;
1948	}
1949
1950	/* initialises tx */
1951	res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1952
1953	if (unlikely(res_prepare == TX_DROP)) {
1954		ieee80211_free_txskb(&local->hw, skb);
1955		tx.sdata->tx_handlers_drop++;
1956		return true;
1957	} else if (unlikely(res_prepare == TX_QUEUED)) {
1958		return true;
1959	}
1960
1961	/* set up hw_queue value early */
1962	if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1963	    !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1964		info->hw_queue =
1965			sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1966
1967	if (invoke_tx_handlers_early(&tx))
1968		return true;
1969
1970	if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1971		return true;
1972
1973	if (!invoke_tx_handlers_late(&tx))
1974		result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending);
1975
1976	return result;
1977}
1978
1979/* device xmit handlers */
1980
1981enum ieee80211_encrypt {
1982	ENCRYPT_NO,
1983	ENCRYPT_MGMT,
1984	ENCRYPT_DATA,
1985};
1986
1987static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1988				struct sk_buff *skb,
1989				int head_need,
1990				enum ieee80211_encrypt encrypt)
1991{
1992	struct ieee80211_local *local = sdata->local;
1993	bool enc_tailroom;
1994	int tail_need = 0;
1995
1996	enc_tailroom = encrypt == ENCRYPT_MGMT ||
1997		       (encrypt == ENCRYPT_DATA &&
1998			sdata->crypto_tx_tailroom_needed_cnt);
1999
2000	if (enc_tailroom) {
2001		tail_need = IEEE80211_ENCRYPT_TAILROOM;
2002		tail_need -= skb_tailroom(skb);
2003		tail_need = max_t(int, tail_need, 0);
2004	}
2005
2006	if (skb_cloned(skb) &&
2007	    (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
2008	     !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
2009		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
2010	else if (head_need || tail_need)
2011		I802_DEBUG_INC(local->tx_expand_skb_head);
2012	else
2013		return 0;
2014
2015	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
2016		wiphy_debug(local->hw.wiphy,
2017			    "failed to reallocate TX buffer\n");
2018		return -ENOMEM;
2019	}
2020
2021	return 0;
2022}
2023
2024void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
2025		    struct sta_info *sta, struct sk_buff *skb)
2026{
2027	struct ieee80211_local *local = sdata->local;
2028	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2029	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2030	int headroom;
2031	enum ieee80211_encrypt encrypt;
2032
2033	if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)
2034		encrypt = ENCRYPT_NO;
2035	else if (ieee80211_is_mgmt(hdr->frame_control))
2036		encrypt = ENCRYPT_MGMT;
2037	else
2038		encrypt = ENCRYPT_DATA;
2039
2040	headroom = local->tx_headroom;
2041	if (encrypt != ENCRYPT_NO)
2042		headroom += IEEE80211_ENCRYPT_HEADROOM;
2043	headroom -= skb_headroom(skb);
2044	headroom = max_t(int, 0, headroom);
2045
2046	if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) {
2047		ieee80211_free_txskb(&local->hw, skb);
2048		return;
2049	}
2050
2051	/* reload after potential resize */
2052	hdr = (struct ieee80211_hdr *) skb->data;
2053	info->control.vif = &sdata->vif;
2054
2055	if (ieee80211_vif_is_mesh(&sdata->vif)) {
2056		if (ieee80211_is_data(hdr->frame_control) &&
2057		    is_unicast_ether_addr(hdr->addr1)) {
2058			if (mesh_nexthop_resolve(sdata, skb))
2059				return; /* skb queued: don't free */
2060		} else {
2061			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2062		}
2063	}
2064
2065	ieee80211_set_qos_hdr(sdata, skb);
2066	ieee80211_tx(sdata, sta, skb, false);
2067}
2068
2069static bool ieee80211_validate_radiotap_len(struct sk_buff *skb)
2070{
2071	struct ieee80211_radiotap_header *rthdr =
2072		(struct ieee80211_radiotap_header *)skb->data;
2073
2074	/* check for not even having the fixed radiotap header part */
2075	if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2076		return false; /* too short to be possibly valid */
2077
2078	/* is it a header version we can trust to find length from? */
2079	if (unlikely(rthdr->it_version))
2080		return false; /* only version 0 is supported */
2081
2082	/* does the skb contain enough to deliver on the alleged length? */
2083	if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data)))
2084		return false; /* skb too short for claimed rt header extent */
2085
2086	return true;
2087}
2088
2089bool ieee80211_parse_tx_radiotap(struct sk_buff *skb,
2090				 struct net_device *dev)
2091{
2092	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2093	struct ieee80211_radiotap_iterator iterator;
2094	struct ieee80211_radiotap_header *rthdr =
2095		(struct ieee80211_radiotap_header *) skb->data;
2096	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2097	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2098						   NULL);
2099	u16 txflags;
2100	u16 rate = 0;
2101	bool rate_found = false;
2102	u8 rate_retries = 0;
2103	u16 rate_flags = 0;
2104	u8 mcs_known, mcs_flags, mcs_bw;
2105	u16 vht_known;
2106	u8 vht_mcs = 0, vht_nss = 0;
2107	int i;
2108
2109	if (!ieee80211_validate_radiotap_len(skb))
2110		return false;
2111
2112	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2113		       IEEE80211_TX_CTL_DONTFRAG;
2114
2115	/*
2116	 * for every radiotap entry that is present
2117	 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2118	 * entries present, or -EINVAL on error)
2119	 */
2120
2121	while (!ret) {
2122		ret = ieee80211_radiotap_iterator_next(&iterator);
2123
2124		if (ret)
2125			continue;
2126
2127		/* see if this argument is something we can use */
2128		switch (iterator.this_arg_index) {
2129		/*
2130		 * You must take care when dereferencing iterator.this_arg
2131		 * for multibyte types... the pointer is not aligned.  Use
2132		 * get_unaligned((type *)iterator.this_arg) to dereference
2133		 * iterator.this_arg for type "type" safely on all arches.
2134		*/
2135		case IEEE80211_RADIOTAP_FLAGS:
2136			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2137				/*
2138				 * this indicates that the skb we have been
2139				 * handed has the 32-bit FCS CRC at the end...
2140				 * we should react to that by snipping it off
2141				 * because it will be recomputed and added
2142				 * on transmission
2143				 */
2144				if (skb->len < (iterator._max_length + FCS_LEN))
2145					return false;
2146
2147				skb_trim(skb, skb->len - FCS_LEN);
2148			}
2149			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2150				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2151			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2152				info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2153			break;
2154
2155		case IEEE80211_RADIOTAP_TX_FLAGS:
2156			txflags = get_unaligned_le16(iterator.this_arg);
2157			if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2158				info->flags |= IEEE80211_TX_CTL_NO_ACK;
2159			if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO)
2160				info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
2161			if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER)
2162				info->control.flags |=
2163					IEEE80211_TX_CTRL_DONT_REORDER;
2164			break;
2165
2166		case IEEE80211_RADIOTAP_RATE:
2167			rate = *iterator.this_arg;
2168			rate_flags = 0;
2169			rate_found = true;
2170			break;
2171
2172		case IEEE80211_RADIOTAP_ANTENNA:
2173			/* this can appear multiple times, keep a bitmap */
2174			info->control.antennas |= BIT(*iterator.this_arg);
2175			break;
2176
2177		case IEEE80211_RADIOTAP_DATA_RETRIES:
2178			rate_retries = *iterator.this_arg;
2179			break;
2180
2181		case IEEE80211_RADIOTAP_MCS:
2182			mcs_known = iterator.this_arg[0];
2183			mcs_flags = iterator.this_arg[1];
2184			if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2185				break;
2186
2187			rate_found = true;
2188			rate = iterator.this_arg[2];
2189			rate_flags = IEEE80211_TX_RC_MCS;
2190
2191			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2192			    mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2193				rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2194
2195			mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2196			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2197			    mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2198				rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2199
2200			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC &&
2201			    mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC)
2202				info->flags |= IEEE80211_TX_CTL_LDPC;
2203
2204			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) {
2205				u8 stbc = u8_get_bits(mcs_flags,
2206						      IEEE80211_RADIOTAP_MCS_STBC_MASK);
2207
2208				info->flags |=
2209					u32_encode_bits(stbc,
2210							IEEE80211_TX_CTL_STBC);
2211			}
2212			break;
2213
2214		case IEEE80211_RADIOTAP_VHT:
2215			vht_known = get_unaligned_le16(iterator.this_arg);
2216			rate_found = true;
2217
2218			rate_flags = IEEE80211_TX_RC_VHT_MCS;
2219			if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2220			    (iterator.this_arg[2] &
2221			     IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2222				rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2223			if (vht_known &
2224			    IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2225				if (iterator.this_arg[3] == 1)
2226					rate_flags |=
2227						IEEE80211_TX_RC_40_MHZ_WIDTH;
2228				else if (iterator.this_arg[3] == 4)
2229					rate_flags |=
2230						IEEE80211_TX_RC_80_MHZ_WIDTH;
2231				else if (iterator.this_arg[3] == 11)
2232					rate_flags |=
2233						IEEE80211_TX_RC_160_MHZ_WIDTH;
2234			}
2235
2236			vht_mcs = iterator.this_arg[4] >> 4;
2237			if (vht_mcs > 11)
2238				vht_mcs = 0;
2239			vht_nss = iterator.this_arg[4] & 0xF;
2240			if (!vht_nss || vht_nss > 8)
2241				vht_nss = 1;
2242			break;
2243
2244		/*
2245		 * Please update the file
2246		 * Documentation/networking/mac80211-injection.rst
2247		 * when parsing new fields here.
2248		 */
2249
2250		default:
2251			break;
2252		}
2253	}
2254
2255	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2256		return false;
2257
2258	if (rate_found) {
2259		struct ieee80211_supported_band *sband =
2260			local->hw.wiphy->bands[info->band];
2261
2262		info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2263
2264		for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2265			info->control.rates[i].idx = -1;
2266			info->control.rates[i].flags = 0;
2267			info->control.rates[i].count = 0;
2268		}
2269
2270		if (rate_flags & IEEE80211_TX_RC_MCS) {
2271			/* reset antennas if not enough */
2272			if (IEEE80211_HT_MCS_CHAINS(rate) >
2273					hweight8(info->control.antennas))
2274				info->control.antennas = 0;
2275
2276			info->control.rates[0].idx = rate;
2277		} else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2278			/* reset antennas if not enough */
2279			if (vht_nss > hweight8(info->control.antennas))
2280				info->control.antennas = 0;
2281
2282			ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2283					       vht_nss);
2284		} else if (sband) {
2285			for (i = 0; i < sband->n_bitrates; i++) {
2286				if (rate * 5 != sband->bitrates[i].bitrate)
2287					continue;
2288
2289				info->control.rates[0].idx = i;
2290				break;
2291			}
2292		}
2293
2294		if (info->control.rates[0].idx < 0)
2295			info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2296
2297		info->control.rates[0].flags = rate_flags;
2298		info->control.rates[0].count = min_t(u8, rate_retries + 1,
2299						     local->hw.max_rate_tries);
2300	}
2301
2302	return true;
2303}
2304
2305netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2306					 struct net_device *dev)
2307{
2308	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2309	struct ieee80211_chanctx_conf *chanctx_conf;
2310	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2311	struct ieee80211_hdr *hdr;
2312	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2313	struct cfg80211_chan_def *chandef;
2314	u16 len_rthdr;
2315	int hdrlen;
2316
2317	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2318	if (unlikely(!ieee80211_sdata_running(sdata)))
2319		goto fail;
2320
2321	memset(info, 0, sizeof(*info));
2322	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2323		      IEEE80211_TX_CTL_INJECTED;
2324
2325	/* Sanity-check the length of the radiotap header */
2326	if (!ieee80211_validate_radiotap_len(skb))
2327		goto fail;
2328
2329	/* we now know there is a radiotap header with a length we can use */
2330	len_rthdr = ieee80211_get_radiotap_len(skb->data);
2331
2332	/*
2333	 * fix up the pointers accounting for the radiotap
2334	 * header still being in there.  We are being given
2335	 * a precooked IEEE80211 header so no need for
2336	 * normal processing
2337	 */
2338	skb_set_mac_header(skb, len_rthdr);
2339	/*
2340	 * these are just fixed to the end of the rt area since we
2341	 * don't have any better information and at this point, nobody cares
2342	 */
2343	skb_set_network_header(skb, len_rthdr);
2344	skb_set_transport_header(skb, len_rthdr);
2345
2346	if (skb->len < len_rthdr + 2)
2347		goto fail;
2348
2349	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2350	hdrlen = ieee80211_hdrlen(hdr->frame_control);
2351
2352	if (skb->len < len_rthdr + hdrlen)
2353		goto fail;
2354
2355	/*
2356	 * Initialize skb->protocol if the injected frame is a data frame
2357	 * carrying a rfc1042 header
2358	 */
2359	if (ieee80211_is_data(hdr->frame_control) &&
2360	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2361		u8 *payload = (u8 *)hdr + hdrlen;
2362
2363		if (ether_addr_equal(payload, rfc1042_header))
2364			skb->protocol = cpu_to_be16((payload[6] << 8) |
2365						    payload[7]);
2366	}
2367
2368	rcu_read_lock();
2369
2370	/*
2371	 * We process outgoing injected frames that have a local address
2372	 * we handle as though they are non-injected frames.
2373	 * This code here isn't entirely correct, the local MAC address
2374	 * isn't always enough to find the interface to use; for proper
2375	 * VLAN support we have an nl80211-based mechanism.
2376	 *
2377	 * This is necessary, for example, for old hostapd versions that
2378	 * don't use nl80211-based management TX/RX.
2379	 */
2380	list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2381		if (!ieee80211_sdata_running(tmp_sdata))
2382			continue;
2383		if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2384		    tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2385			continue;
2386		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2387			sdata = tmp_sdata;
2388			break;
2389		}
2390	}
2391
2392	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2393	if (!chanctx_conf) {
2394		tmp_sdata = rcu_dereference(local->monitor_sdata);
2395		if (tmp_sdata)
2396			chanctx_conf =
2397				rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf);
2398	}
2399
2400	if (chanctx_conf)
2401		chandef = &chanctx_conf->def;
2402	else if (local->emulate_chanctx)
2403		chandef = &local->hw.conf.chandef;
2404	else
2405		goto fail_rcu;
2406
2407	/*
2408	 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still
2409	 * shouldn't transmit on disabled channels.
2410	 */
2411	if (!cfg80211_chandef_usable(local->hw.wiphy, chandef,
2412				     IEEE80211_CHAN_DISABLED))
2413		goto fail_rcu;
2414
2415	/*
2416	 * Frame injection is not allowed if beaconing is not allowed
2417	 * or if we need radar detection. Beaconing is usually not allowed when
2418	 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2419	 * Passive scan is also used in world regulatory domains where
2420	 * your country is not known and as such it should be treated as
2421	 * NO TX unless the channel is explicitly allowed in which case
2422	 * your current regulatory domain would not have the passive scan
2423	 * flag.
2424	 *
2425	 * Since AP mode uses monitor interfaces to inject/TX management
2426	 * frames we can make AP mode the exception to this rule once it
2427	 * supports radar detection as its implementation can deal with
2428	 * radar detection by itself. We can do that later by adding a
2429	 * monitor flag interfaces used for AP support.
2430	 */
2431	if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2432				     sdata->vif.type))
2433		goto fail_rcu;
2434
2435	info->band = chandef->chan->band;
2436
2437	/* Initialize skb->priority according to frame type and TID class,
2438	 * with respect to the sub interface that the frame will actually
2439	 * be transmitted on. If the DONT_REORDER flag is set, the original
2440	 * skb-priority is preserved to assure frames injected with this
2441	 * flag are not reordered relative to each other.
2442	 */
2443	ieee80211_select_queue_80211(sdata, skb, hdr);
2444	skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority));
2445
2446	/*
2447	 * Process the radiotap header. This will now take into account the
2448	 * selected chandef above to accurately set injection rates and
2449	 * retransmissions.
2450	 */
2451	if (!ieee80211_parse_tx_radiotap(skb, dev))
2452		goto fail_rcu;
2453
2454	/* remove the injection radiotap header */
2455	skb_pull(skb, len_rthdr);
2456
2457	ieee80211_xmit(sdata, NULL, skb);
2458	rcu_read_unlock();
2459
2460	return NETDEV_TX_OK;
2461
2462fail_rcu:
2463	rcu_read_unlock();
2464fail:
2465	dev_kfree_skb(skb);
2466	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2467}
2468
2469static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2470{
2471	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2472
2473	return ethertype == ETH_P_TDLS &&
2474	       skb->len > 14 &&
2475	       skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2476}
2477
2478int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2479			    struct sk_buff *skb,
2480			    struct sta_info **sta_out)
2481{
2482	struct sta_info *sta;
2483
2484	switch (sdata->vif.type) {
2485	case NL80211_IFTYPE_AP_VLAN:
2486		sta = rcu_dereference(sdata->u.vlan.sta);
2487		if (sta) {
2488			*sta_out = sta;
2489			return 0;
2490		} else if (sdata->wdev.use_4addr) {
2491			return -ENOLINK;
2492		}
2493		fallthrough;
2494	case NL80211_IFTYPE_AP:
2495	case NL80211_IFTYPE_OCB:
2496	case NL80211_IFTYPE_ADHOC:
2497		if (is_multicast_ether_addr(skb->data)) {
2498			*sta_out = ERR_PTR(-ENOENT);
2499			return 0;
2500		}
2501		sta = sta_info_get_bss(sdata, skb->data);
2502		break;
2503#ifdef CONFIG_MAC80211_MESH
2504	case NL80211_IFTYPE_MESH_POINT:
2505		/* determined much later */
2506		*sta_out = NULL;
2507		return 0;
2508#endif
2509	case NL80211_IFTYPE_STATION:
2510		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2511			sta = sta_info_get(sdata, skb->data);
2512			if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2513				if (test_sta_flag(sta,
2514						  WLAN_STA_TDLS_PEER_AUTH)) {
2515					*sta_out = sta;
2516					return 0;
2517				}
2518
2519				/*
2520				 * TDLS link during setup - throw out frames to
2521				 * peer. Allow TDLS-setup frames to unauthorized
2522				 * peers for the special case of a link teardown
2523				 * after a TDLS sta is removed due to being
2524				 * unreachable.
2525				 */
2526				if (!ieee80211_is_tdls_setup(skb))
2527					return -EINVAL;
2528			}
2529
2530		}
2531
2532		sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
2533		if (!sta)
2534			return -ENOLINK;
2535		break;
2536	default:
2537		return -EINVAL;
2538	}
2539
2540	*sta_out = sta ?: ERR_PTR(-ENOENT);
2541	return 0;
2542}
2543
2544static u16 ieee80211_store_ack_skb(struct ieee80211_local *local,
2545				   struct sk_buff *skb,
2546				   u32 *info_flags,
2547				   u64 *cookie)
2548{
2549	struct sk_buff *ack_skb;
2550	u16 info_id = 0;
2551
2552	if (skb->sk)
2553		ack_skb = skb_clone_sk(skb);
2554	else
2555		ack_skb = skb_clone(skb, GFP_ATOMIC);
2556
2557	if (ack_skb) {
2558		unsigned long flags;
2559		int id;
2560
2561		spin_lock_irqsave(&local->ack_status_lock, flags);
2562		id = idr_alloc(&local->ack_status_frames, ack_skb,
2563			       1, 0x2000, GFP_ATOMIC);
2564		spin_unlock_irqrestore(&local->ack_status_lock, flags);
2565
2566		if (id >= 0) {
2567			info_id = id;
2568			*info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2569			if (cookie) {
2570				*cookie = ieee80211_mgmt_tx_cookie(local);
2571				IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie;
2572			}
2573		} else {
2574			kfree_skb(ack_skb);
2575		}
2576	}
2577
2578	return info_id;
2579}
2580
2581/**
2582 * ieee80211_build_hdr - build 802.11 header in the given frame
2583 * @sdata: virtual interface to build the header for
2584 * @skb: the skb to build the header in
2585 * @info_flags: skb flags to set
2586 * @sta: the station pointer
2587 * @ctrl_flags: info control flags to set
2588 * @cookie: cookie pointer to fill (if not %NULL)
2589 *
2590 * This function takes the skb with 802.3 header and reformats the header to
2591 * the appropriate IEEE 802.11 header based on which interface the packet is
2592 * being transmitted on.
2593 *
2594 * Note that this function also takes care of the TX status request and
2595 * potential unsharing of the SKB - this needs to be interleaved with the
2596 * header building.
2597 *
2598 * The function requires the read-side RCU lock held
2599 *
2600 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2601 */
2602static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2603					   struct sk_buff *skb, u32 info_flags,
2604					   struct sta_info *sta, u32 ctrl_flags,
2605					   u64 *cookie)
2606{
2607	struct ieee80211_local *local = sdata->local;
2608	struct ieee80211_tx_info *info;
2609	int head_need;
2610	u16 ethertype, hdrlen,  meshhdrlen = 0;
2611	__le16 fc;
2612	struct ieee80211_hdr hdr;
2613	struct ieee80211s_hdr mesh_hdr __maybe_unused;
2614	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2615	const u8 *encaps_data;
2616	int encaps_len, skip_header_bytes;
2617	bool wme_sta = false, authorized = false;
2618	bool tdls_peer;
2619	bool multicast;
2620	u16 info_id = 0;
2621	struct ieee80211_chanctx_conf *chanctx_conf = NULL;
2622	enum nl80211_band band;
2623	int ret;
2624	u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK);
2625
2626	if (IS_ERR(sta))
2627		sta = NULL;
2628
2629#ifdef CONFIG_MAC80211_DEBUGFS
2630	if (local->force_tx_status)
2631		info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2632#endif
2633
2634	/* convert Ethernet header to proper 802.11 header (based on
2635	 * operation mode) */
2636	ethertype = (skb->data[12] << 8) | skb->data[13];
2637	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2638
2639	if (!ieee80211_vif_is_mld(&sdata->vif))
2640		chanctx_conf =
2641			rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2642
2643	switch (sdata->vif.type) {
2644	case NL80211_IFTYPE_AP_VLAN:
2645		if (sdata->wdev.use_4addr) {
2646			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2647			/* RA TA DA SA */
2648			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2649			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2650			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2651			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2652			hdrlen = 30;
2653			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2654			wme_sta = sta->sta.wme;
2655		}
2656		if (!ieee80211_vif_is_mld(&sdata->vif)) {
2657			struct ieee80211_sub_if_data *ap_sdata;
2658
2659			/* override chanctx_conf from AP (we don't have one) */
2660			ap_sdata = container_of(sdata->bss,
2661						struct ieee80211_sub_if_data,
2662						u.ap);
2663			chanctx_conf =
2664				rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf);
2665		}
2666		if (sdata->wdev.use_4addr)
2667			break;
2668		fallthrough;
2669	case NL80211_IFTYPE_AP:
2670		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2671		/* DA BSSID SA */
2672		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2673
2674		if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) {
2675			struct ieee80211_link_data *link;
2676
2677			link_id = sta->deflink.link_id;
2678			link = rcu_dereference(sdata->link[link_id]);
2679			if (WARN_ON(!link)) {
2680				ret = -ENOLINK;
2681				goto free;
2682			}
2683			memcpy(hdr.addr2, link->conf->addr, ETH_ALEN);
2684		} else if (link_id == IEEE80211_LINK_UNSPECIFIED ||
2685			   (sta && sta->sta.mlo)) {
2686			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2687		} else {
2688			struct ieee80211_bss_conf *conf;
2689
2690			conf = rcu_dereference(sdata->vif.link_conf[link_id]);
2691			if (unlikely(!conf)) {
2692				ret = -ENOLINK;
2693				goto free;
2694			}
2695
2696			memcpy(hdr.addr2, conf->addr, ETH_ALEN);
2697		}
2698
2699		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2700		hdrlen = 24;
2701		break;
2702#ifdef CONFIG_MAC80211_MESH
2703	case NL80211_IFTYPE_MESH_POINT:
2704		if (!is_multicast_ether_addr(skb->data)) {
2705			struct sta_info *next_hop;
2706			bool mpp_lookup = true;
2707
2708			mpath = mesh_path_lookup(sdata, skb->data);
2709			if (mpath) {
2710				mpp_lookup = false;
2711				next_hop = rcu_dereference(mpath->next_hop);
2712				if (!next_hop ||
2713				    !(mpath->flags & (MESH_PATH_ACTIVE |
2714						      MESH_PATH_RESOLVING)))
2715					mpp_lookup = true;
2716			}
2717
2718			if (mpp_lookup) {
2719				mppath = mpp_path_lookup(sdata, skb->data);
2720				if (mppath)
2721					mppath->exp_time = jiffies;
2722			}
2723
2724			if (mppath && mpath)
2725				mesh_path_del(sdata, mpath->dst);
2726		}
2727
2728		/*
2729		 * Use address extension if it is a packet from
2730		 * another interface or if we know the destination
2731		 * is being proxied by a portal (i.e. portal address
2732		 * differs from proxied address)
2733		 */
2734		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2735		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2736			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2737					skb->data, skb->data + ETH_ALEN);
2738			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2739							       NULL, NULL);
2740		} else {
2741			/* DS -> MBSS (802.11-2012 13.11.3.3).
2742			 * For unicast with unknown forwarding information,
2743			 * destination might be in the MBSS or if that fails
2744			 * forwarded to another mesh gate. In either case
2745			 * resolution will be handled in ieee80211_xmit(), so
2746			 * leave the original DA. This also works for mcast */
2747			const u8 *mesh_da = skb->data;
2748
2749			if (mppath)
2750				mesh_da = mppath->mpp;
2751			else if (mpath)
2752				mesh_da = mpath->dst;
2753
2754			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2755					mesh_da, sdata->vif.addr);
2756			if (is_multicast_ether_addr(mesh_da))
2757				/* DA TA mSA AE:SA */
2758				meshhdrlen = ieee80211_new_mesh_header(
2759						sdata, &mesh_hdr,
2760						skb->data + ETH_ALEN, NULL);
2761			else
2762				/* RA TA mDA mSA AE:DA SA */
2763				meshhdrlen = ieee80211_new_mesh_header(
2764						sdata, &mesh_hdr, skb->data,
2765						skb->data + ETH_ALEN);
2766
2767		}
2768
2769		/* For injected frames, fill RA right away as nexthop lookup
2770		 * will be skipped.
2771		 */
2772		if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) &&
2773		    is_zero_ether_addr(hdr.addr1))
2774			memcpy(hdr.addr1, skb->data, ETH_ALEN);
2775		break;
2776#endif
2777	case NL80211_IFTYPE_STATION:
2778		/* we already did checks when looking up the RA STA */
2779		tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2780
2781		if (tdls_peer) {
2782			/* For TDLS only one link can be valid with peer STA */
2783			int tdls_link_id = ieee80211_tdls_sta_link_id(sta);
2784			struct ieee80211_link_data *link;
2785
2786			/* DA SA BSSID */
2787			memcpy(hdr.addr1, skb->data, ETH_ALEN);
2788			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2789			link = rcu_dereference(sdata->link[tdls_link_id]);
2790			if (WARN_ON_ONCE(!link)) {
2791				ret = -EINVAL;
2792				goto free;
2793			}
2794			memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN);
2795			hdrlen = 24;
2796		}  else if (sdata->u.mgd.use_4addr &&
2797			    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2798			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2799					  IEEE80211_FCTL_TODS);
2800			/* RA TA DA SA */
2801			memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN);
2802			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2803			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2804			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2805			hdrlen = 30;
2806		} else {
2807			fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2808			/* BSSID SA DA */
2809			memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN);
2810			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2811			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2812			hdrlen = 24;
2813		}
2814		break;
2815	case NL80211_IFTYPE_OCB:
2816		/* DA SA BSSID */
2817		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2818		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2819		eth_broadcast_addr(hdr.addr3);
2820		hdrlen = 24;
2821		break;
2822	case NL80211_IFTYPE_ADHOC:
2823		/* DA SA BSSID */
2824		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2825		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2826		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2827		hdrlen = 24;
2828		break;
2829	default:
2830		ret = -EINVAL;
2831		goto free;
2832	}
2833
2834	if (!chanctx_conf) {
2835		if (!ieee80211_vif_is_mld(&sdata->vif)) {
2836			ret = -ENOTCONN;
2837			goto free;
2838		}
2839		/* MLD transmissions must not rely on the band */
2840		band = 0;
2841	} else {
2842		band = chanctx_conf->def.chan->band;
2843	}
2844
2845	multicast = is_multicast_ether_addr(hdr.addr1);
2846
2847	/* sta is always NULL for mesh */
2848	if (sta) {
2849		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2850		wme_sta = sta->sta.wme;
2851	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2852		/* For mesh, the use of the QoS header is mandatory */
2853		wme_sta = true;
2854	}
2855
2856	/* receiver does QoS (which also means we do) use it */
2857	if (wme_sta) {
2858		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2859		hdrlen += 2;
2860	}
2861
2862	/*
2863	 * Drop unicast frames to unauthorised stations unless they are
2864	 * EAPOL frames from the local station.
2865	 */
2866	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2867		     (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2868		     !multicast && !authorized &&
2869		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2870		      !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) {
2871#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2872		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2873				    sdata->name, hdr.addr1);
2874#endif
2875
2876		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2877
2878		ret = -EPERM;
2879		goto free;
2880	}
2881
2882	if (unlikely(!multicast &&
2883		     (sk_requests_wifi_status(skb->sk) ||
2884		      ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS)))
2885		info_id = ieee80211_store_ack_skb(local, skb, &info_flags,
2886						  cookie);
2887
2888	/*
2889	 * If the skb is shared we need to obtain our own copy.
2890	 */
2891	skb = skb_share_check(skb, GFP_ATOMIC);
2892	if (unlikely(!skb)) {
2893		ret = -ENOMEM;
2894		goto free;
2895	}
2896
2897	hdr.frame_control = fc;
2898	hdr.duration_id = 0;
2899	hdr.seq_ctrl = 0;
2900
2901	skip_header_bytes = ETH_HLEN;
2902	if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2903		encaps_data = bridge_tunnel_header;
2904		encaps_len = sizeof(bridge_tunnel_header);
2905		skip_header_bytes -= 2;
2906	} else if (ethertype >= ETH_P_802_3_MIN) {
2907		encaps_data = rfc1042_header;
2908		encaps_len = sizeof(rfc1042_header);
2909		skip_header_bytes -= 2;
2910	} else {
2911		encaps_data = NULL;
2912		encaps_len = 0;
2913	}
2914
2915	skb_pull(skb, skip_header_bytes);
2916	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2917
2918	/*
2919	 * So we need to modify the skb header and hence need a copy of
2920	 * that. The head_need variable above doesn't, so far, include
2921	 * the needed header space that we don't need right away. If we
2922	 * can, then we don't reallocate right now but only after the
2923	 * frame arrives at the master device (if it does...)
2924	 *
2925	 * If we cannot, however, then we will reallocate to include all
2926	 * the ever needed space. Also, if we need to reallocate it anyway,
2927	 * make it big enough for everything we may ever need.
2928	 */
2929
2930	if (head_need > 0 || skb_cloned(skb)) {
2931		head_need += IEEE80211_ENCRYPT_HEADROOM;
2932		head_need += local->tx_headroom;
2933		head_need = max_t(int, 0, head_need);
2934		if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) {
2935			ieee80211_free_txskb(&local->hw, skb);
2936			skb = NULL;
2937			return ERR_PTR(-ENOMEM);
2938		}
2939	}
2940
2941	if (encaps_data)
2942		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2943
2944#ifdef CONFIG_MAC80211_MESH
2945	if (meshhdrlen > 0)
2946		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2947#endif
2948
2949	if (ieee80211_is_data_qos(fc)) {
2950		__le16 *qos_control;
2951
2952		qos_control = skb_push(skb, 2);
2953		memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2954		/*
2955		 * Maybe we could actually set some fields here, for now just
2956		 * initialise to zero to indicate no special operation.
2957		 */
2958		*qos_control = 0;
2959	} else
2960		memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2961
2962	skb_reset_mac_header(skb);
2963
2964	info = IEEE80211_SKB_CB(skb);
2965	memset(info, 0, sizeof(*info));
2966
2967	info->flags = info_flags;
2968	if (info_id) {
2969		info->status_data = info_id;
2970		info->status_data_idr = 1;
2971	}
2972	info->band = band;
2973
2974	if (likely(!cookie)) {
2975		ctrl_flags |= u32_encode_bits(link_id,
2976					      IEEE80211_TX_CTRL_MLO_LINK);
2977	} else {
2978		unsigned int pre_conf_link_id;
2979
2980		/*
2981		 * ctrl_flags already have been set by
2982		 * ieee80211_tx_control_port(), here
2983		 * we just sanity check that
2984		 */
2985
2986		pre_conf_link_id = u32_get_bits(ctrl_flags,
2987						IEEE80211_TX_CTRL_MLO_LINK);
2988
2989		if (pre_conf_link_id != link_id &&
2990		    link_id != IEEE80211_LINK_UNSPECIFIED) {
2991#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2992			net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n",
2993					     sdata->name, hdr.addr1,
2994					     pre_conf_link_id, link_id);
2995#endif
2996			ret = -EINVAL;
2997			goto free;
2998		}
2999	}
3000
3001	info->control.flags = ctrl_flags;
3002
3003	return skb;
3004 free:
3005	kfree_skb(skb);
3006	return ERR_PTR(ret);
3007}
3008
3009/*
3010 * fast-xmit overview
3011 *
3012 * The core idea of this fast-xmit is to remove per-packet checks by checking
3013 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
3014 * checks that are needed to get the sta->fast_tx pointer assigned, after which
3015 * much less work can be done per packet. For example, fragmentation must be
3016 * disabled or the fast_tx pointer will not be set. All the conditions are seen
3017 * in the code here.
3018 *
3019 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
3020 * header and other data to aid packet processing in ieee80211_xmit_fast().
3021 *
3022 * The most difficult part of this is that when any of these assumptions
3023 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
3024 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
3025 * since the per-packet code no longer checks the conditions. This is reflected
3026 * by the calls to these functions throughout the rest of the code, and must be
3027 * maintained if any of the TX path checks change.
3028 */
3029
3030void ieee80211_check_fast_xmit(struct sta_info *sta)
3031{
3032	struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
3033	struct ieee80211_local *local = sta->local;
3034	struct ieee80211_sub_if_data *sdata = sta->sdata;
3035	struct ieee80211_hdr *hdr = (void *)build.hdr;
3036	struct ieee80211_chanctx_conf *chanctx_conf;
3037	__le16 fc;
3038
3039	if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
3040		return;
3041
3042	if (ieee80211_vif_is_mesh(&sdata->vif))
3043		mesh_fast_tx_flush_sta(sdata, sta);
3044
3045	/* Locking here protects both the pointer itself, and against concurrent
3046	 * invocations winning data access races to, e.g., the key pointer that
3047	 * is used.
3048	 * Without it, the invocation of this function right after the key
3049	 * pointer changes wouldn't be sufficient, as another CPU could access
3050	 * the pointer, then stall, and then do the cache update after the CPU
3051	 * that invalidated the key.
3052	 * With the locking, such scenarios cannot happen as the check for the
3053	 * key and the fast-tx assignment are done atomically, so the CPU that
3054	 * modifies the key will either wait or other one will see the key
3055	 * cleared/changed already.
3056	 */
3057	spin_lock_bh(&sta->lock);
3058	if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3059	    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3060	    sdata->vif.type == NL80211_IFTYPE_STATION)
3061		goto out;
3062
3063	if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded)
3064		goto out;
3065
3066	if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
3067	    test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
3068	    test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
3069	    test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
3070		goto out;
3071
3072	if (sdata->noack_map)
3073		goto out;
3074
3075	/* fast-xmit doesn't handle fragmentation at all */
3076	if (local->hw.wiphy->frag_threshold != (u32)-1 &&
3077	    !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
3078		goto out;
3079
3080	if (!ieee80211_vif_is_mld(&sdata->vif)) {
3081		rcu_read_lock();
3082		chanctx_conf =
3083			rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
3084		if (!chanctx_conf) {
3085			rcu_read_unlock();
3086			goto out;
3087		}
3088		build.band = chanctx_conf->def.chan->band;
3089		rcu_read_unlock();
3090	} else {
3091		/* MLD transmissions must not rely on the band */
3092		build.band = 0;
3093	}
3094
3095	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
3096
3097	switch (sdata->vif.type) {
3098	case NL80211_IFTYPE_ADHOC:
3099		/* DA SA BSSID */
3100		build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3101		build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3102		memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
3103		build.hdr_len = 24;
3104		break;
3105	case NL80211_IFTYPE_STATION:
3106		if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
3107			/* For TDLS only one link can be valid with peer STA */
3108			int tdls_link_id = ieee80211_tdls_sta_link_id(sta);
3109			struct ieee80211_link_data *link;
3110
3111			/* DA SA BSSID */
3112			build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3113			build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3114			rcu_read_lock();
3115			link = rcu_dereference(sdata->link[tdls_link_id]);
3116			if (!WARN_ON_ONCE(!link))
3117				memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN);
3118			rcu_read_unlock();
3119			build.hdr_len = 24;
3120			break;
3121		}
3122
3123		if (sdata->u.mgd.use_4addr) {
3124			/* non-regular ethertype cannot use the fastpath */
3125			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
3126					  IEEE80211_FCTL_TODS);
3127			/* RA TA DA SA */
3128			memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN);
3129			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3130			build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3131			build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3132			build.hdr_len = 30;
3133			break;
3134		}
3135		fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
3136		/* BSSID SA DA */
3137		memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN);
3138		build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3139		build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3140		build.hdr_len = 24;
3141		break;
3142	case NL80211_IFTYPE_AP_VLAN:
3143		if (sdata->wdev.use_4addr) {
3144			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
3145					  IEEE80211_FCTL_TODS);
3146			/* RA TA DA SA */
3147			memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
3148			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3149			build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3150			build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3151			build.hdr_len = 30;
3152			break;
3153		}
3154		fallthrough;
3155	case NL80211_IFTYPE_AP:
3156		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
3157		/* DA BSSID SA */
3158		build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3159		if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) {
3160			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3161		} else {
3162			unsigned int link_id = sta->deflink.link_id;
3163			struct ieee80211_link_data *link;
3164
3165			rcu_read_lock();
3166			link = rcu_dereference(sdata->link[link_id]);
3167			if (WARN_ON(!link)) {
3168				rcu_read_unlock();
3169				goto out;
3170			}
3171			memcpy(hdr->addr2, link->conf->addr, ETH_ALEN);
3172			rcu_read_unlock();
3173		}
3174		build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3175		build.hdr_len = 24;
3176		break;
3177	default:
3178		/* not handled on fast-xmit */
3179		goto out;
3180	}
3181
3182	if (sta->sta.wme) {
3183		build.hdr_len += 2;
3184		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
3185	}
3186
3187	/* We store the key here so there's no point in using rcu_dereference()
3188	 * but that's fine because the code that changes the pointers will call
3189	 * this function after doing so. For a single CPU that would be enough,
3190	 * for multiple see the comment above.
3191	 */
3192	build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
3193	if (!build.key)
3194		build.key = rcu_access_pointer(sdata->default_unicast_key);
3195	if (build.key) {
3196		bool gen_iv, iv_spc, mmic;
3197
3198		gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
3199		iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
3200		mmic = build.key->conf.flags &
3201			(IEEE80211_KEY_FLAG_GENERATE_MMIC |
3202			 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
3203
3204		/* don't handle software crypto */
3205		if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
3206			goto out;
3207
3208		/* Key is being removed */
3209		if (build.key->flags & KEY_FLAG_TAINTED)
3210			goto out;
3211
3212		switch (build.key->conf.cipher) {
3213		case WLAN_CIPHER_SUITE_CCMP:
3214		case WLAN_CIPHER_SUITE_CCMP_256:
3215			if (gen_iv)
3216				build.pn_offs = build.hdr_len;
3217			if (gen_iv || iv_spc)
3218				build.hdr_len += IEEE80211_CCMP_HDR_LEN;
3219			break;
3220		case WLAN_CIPHER_SUITE_GCMP:
3221		case WLAN_CIPHER_SUITE_GCMP_256:
3222			if (gen_iv)
3223				build.pn_offs = build.hdr_len;
3224			if (gen_iv || iv_spc)
3225				build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3226			break;
3227		case WLAN_CIPHER_SUITE_TKIP:
3228			/* cannot handle MMIC or IV generation in xmit-fast */
3229			if (mmic || gen_iv)
3230				goto out;
3231			if (iv_spc)
3232				build.hdr_len += IEEE80211_TKIP_IV_LEN;
3233			break;
3234		case WLAN_CIPHER_SUITE_WEP40:
3235		case WLAN_CIPHER_SUITE_WEP104:
3236			/* cannot handle IV generation in fast-xmit */
3237			if (gen_iv)
3238				goto out;
3239			if (iv_spc)
3240				build.hdr_len += IEEE80211_WEP_IV_LEN;
3241			break;
3242		case WLAN_CIPHER_SUITE_AES_CMAC:
3243		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3244		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3245		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3246			WARN(1,
3247			     "management cipher suite 0x%x enabled for data\n",
3248			     build.key->conf.cipher);
3249			goto out;
3250		default:
3251			/* we don't know how to generate IVs for this at all */
3252			if (WARN_ON(gen_iv))
3253				goto out;
3254		}
3255
3256		fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3257	}
3258
3259	hdr->frame_control = fc;
3260
3261	memcpy(build.hdr + build.hdr_len,
3262	       rfc1042_header,  sizeof(rfc1042_header));
3263	build.hdr_len += sizeof(rfc1042_header);
3264
3265	fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3266	/* if the kmemdup fails, continue w/o fast_tx */
3267
3268 out:
3269	/* we might have raced against another call to this function */
3270	old = rcu_dereference_protected(sta->fast_tx,
3271					lockdep_is_held(&sta->lock));
3272	rcu_assign_pointer(sta->fast_tx, fast_tx);
3273	if (old)
3274		kfree_rcu(old, rcu_head);
3275	spin_unlock_bh(&sta->lock);
3276}
3277
3278void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3279{
3280	struct sta_info *sta;
3281
3282	rcu_read_lock();
3283	list_for_each_entry_rcu(sta, &local->sta_list, list)
3284		ieee80211_check_fast_xmit(sta);
3285	rcu_read_unlock();
3286}
3287
3288void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3289{
3290	struct ieee80211_local *local = sdata->local;
3291	struct sta_info *sta;
3292
3293	rcu_read_lock();
3294
3295	list_for_each_entry_rcu(sta, &local->sta_list, list) {
3296		if (sdata != sta->sdata &&
3297		    (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3298			continue;
3299		ieee80211_check_fast_xmit(sta);
3300	}
3301
3302	rcu_read_unlock();
3303}
3304
3305void ieee80211_clear_fast_xmit(struct sta_info *sta)
3306{
3307	struct ieee80211_fast_tx *fast_tx;
3308
3309	spin_lock_bh(&sta->lock);
3310	fast_tx = rcu_dereference_protected(sta->fast_tx,
3311					    lockdep_is_held(&sta->lock));
3312	RCU_INIT_POINTER(sta->fast_tx, NULL);
3313	spin_unlock_bh(&sta->lock);
3314
3315	if (fast_tx)
3316		kfree_rcu(fast_tx, rcu_head);
3317}
3318
3319static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3320					struct sk_buff *skb, int headroom)
3321{
3322	if (skb_headroom(skb) < headroom) {
3323		I802_DEBUG_INC(local->tx_expand_skb_head);
3324
3325		if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3326			wiphy_debug(local->hw.wiphy,
3327				    "failed to reallocate TX buffer\n");
3328			return false;
3329		}
3330	}
3331
3332	return true;
3333}
3334
3335static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3336					 struct ieee80211_fast_tx *fast_tx,
3337					 struct sk_buff *skb)
3338{
3339	struct ieee80211_local *local = sdata->local;
3340	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3341	struct ieee80211_hdr *hdr;
3342	struct ethhdr *amsdu_hdr;
3343	int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3344	int subframe_len = skb->len - hdr_len;
3345	void *data;
3346	u8 *qc, *h_80211_src, *h_80211_dst;
3347	const u8 *bssid;
3348
3349	if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3350		return false;
3351
3352	if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3353		return true;
3354
3355	if (!ieee80211_amsdu_realloc_pad(local, skb,
3356					 sizeof(*amsdu_hdr) +
3357					 local->hw.extra_tx_headroom))
3358		return false;
3359
3360	data = skb_push(skb, sizeof(*amsdu_hdr));
3361	memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3362	hdr = data;
3363	amsdu_hdr = data + hdr_len;
3364	/* h_80211_src/dst is addr* field within hdr */
3365	h_80211_src = data + fast_tx->sa_offs;
3366	h_80211_dst = data + fast_tx->da_offs;
3367
3368	amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3369	ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3370	ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3371
3372	/* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3373	 * fields needs to be changed to BSSID for A-MSDU frames depending
3374	 * on FromDS/ToDS values.
3375	 */
3376	switch (sdata->vif.type) {
3377	case NL80211_IFTYPE_STATION:
3378		bssid = sdata->vif.cfg.ap_addr;
3379		break;
3380	case NL80211_IFTYPE_AP:
3381	case NL80211_IFTYPE_AP_VLAN:
3382		bssid = sdata->vif.addr;
3383		break;
3384	default:
3385		bssid = NULL;
3386	}
3387
3388	if (bssid && ieee80211_has_fromds(hdr->frame_control))
3389		ether_addr_copy(h_80211_src, bssid);
3390
3391	if (bssid && ieee80211_has_tods(hdr->frame_control))
3392		ether_addr_copy(h_80211_dst, bssid);
3393
3394	qc = ieee80211_get_qos_ctl(hdr);
3395	*qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3396
3397	info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3398
3399	return true;
3400}
3401
3402static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3403				      struct sta_info *sta,
3404				      struct ieee80211_fast_tx *fast_tx,
3405				      struct sk_buff *skb,
3406				      const u8 *da, const u8 *sa)
3407{
3408	struct ieee80211_local *local = sdata->local;
3409	struct fq *fq = &local->fq;
3410	struct fq_tin *tin;
3411	struct fq_flow *flow;
3412	u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3413	struct ieee80211_txq *txq = sta->sta.txq[tid];
3414	struct txq_info *txqi;
3415	struct sk_buff **frag_tail, *head;
3416	int subframe_len = skb->len - ETH_ALEN;
3417	u8 max_subframes = sta->sta.max_amsdu_subframes;
3418	int max_frags = local->hw.max_tx_fragments;
3419	int max_amsdu_len = sta->sta.cur->max_amsdu_len;
3420	int orig_truesize;
3421	u32 flow_idx;
3422	__be16 len;
3423	void *data;
3424	bool ret = false;
3425	unsigned int orig_len;
3426	int n = 2, nfrags, pad = 0;
3427	u16 hdrlen;
3428
3429	if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3430		return false;
3431
3432	if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED)
3433		return false;
3434
3435	if (ieee80211_vif_is_mesh(&sdata->vif))
3436		return false;
3437
3438	if (skb_is_gso(skb))
3439		return false;
3440
3441	if (!txq)
3442		return false;
3443
3444	txqi = to_txq_info(txq);
3445	if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3446		return false;
3447
3448	if (sta->sta.cur->max_rc_amsdu_len)
3449		max_amsdu_len = min_t(int, max_amsdu_len,
3450				      sta->sta.cur->max_rc_amsdu_len);
3451
3452	if (sta->sta.cur->max_tid_amsdu_len[tid])
3453		max_amsdu_len = min_t(int, max_amsdu_len,
3454				      sta->sta.cur->max_tid_amsdu_len[tid]);
3455
3456	flow_idx = fq_flow_idx(fq, skb);
3457
3458	spin_lock_bh(&fq->lock);
3459
3460	/* TODO: Ideally aggregation should be done on dequeue to remain
3461	 * responsive to environment changes.
3462	 */
3463
3464	tin = &txqi->tin;
3465	flow = fq_flow_classify(fq, tin, flow_idx, skb);
3466	head = skb_peek_tail(&flow->queue);
3467	if (!head || skb_is_gso(head))
3468		goto out;
3469
3470	orig_truesize = head->truesize;
3471	orig_len = head->len;
3472
3473	if (skb->len + head->len > max_amsdu_len)
3474		goto out;
3475
3476	nfrags = 1 + skb_shinfo(skb)->nr_frags;
3477	nfrags += 1 + skb_shinfo(head)->nr_frags;
3478	frag_tail = &skb_shinfo(head)->frag_list;
3479	while (*frag_tail) {
3480		nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3481		frag_tail = &(*frag_tail)->next;
3482		n++;
3483	}
3484
3485	if (max_subframes && n > max_subframes)
3486		goto out;
3487
3488	if (max_frags && nfrags > max_frags)
3489		goto out;
3490
3491	if (!drv_can_aggregate_in_amsdu(local, head, skb))
3492		goto out;
3493
3494	if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3495		goto out;
3496
3497	/* If n == 2, the "while (*frag_tail)" loop above didn't execute
3498	 * and  frag_tail should be &skb_shinfo(head)->frag_list.
3499	 * However, ieee80211_amsdu_prepare_head() can reallocate it.
3500	 * Reload frag_tail to have it pointing to the correct place.
3501	 */
3502	if (n == 2)
3503		frag_tail = &skb_shinfo(head)->frag_list;
3504
3505	/*
3506	 * Pad out the previous subframe to a multiple of 4 by adding the
3507	 * padding to the next one, that's being added. Note that head->len
3508	 * is the length of the full A-MSDU, but that works since each time
3509	 * we add a new subframe we pad out the previous one to a multiple
3510	 * of 4 and thus it no longer matters in the next round.
3511	 */
3512	hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3513	if ((head->len - hdrlen) & 3)
3514		pad = 4 - ((head->len - hdrlen) & 3);
3515
3516	if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3517						     2 + pad))
3518		goto out_recalc;
3519
3520	ret = true;
3521	data = skb_push(skb, ETH_ALEN + 2);
3522	ether_addr_copy(data, da);
3523	ether_addr_copy(data + ETH_ALEN, sa);
3524
3525	data += 2 * ETH_ALEN;
3526	len = cpu_to_be16(subframe_len);
3527	memcpy(data, &len, 2);
3528	memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3529
3530	memset(skb_push(skb, pad), 0, pad);
3531
3532	head->len += skb->len;
3533	head->data_len += skb->len;
3534	*frag_tail = skb;
3535
3536out_recalc:
3537	fq->memory_usage += head->truesize - orig_truesize;
3538	if (head->len != orig_len) {
3539		flow->backlog += head->len - orig_len;
3540		tin->backlog_bytes += head->len - orig_len;
3541	}
3542out:
3543	spin_unlock_bh(&fq->lock);
3544
3545	return ret;
3546}
3547
3548/*
3549 * Can be called while the sta lock is held. Anything that can cause packets to
3550 * be generated will cause deadlock!
3551 */
3552static ieee80211_tx_result
3553ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3554			   struct sta_info *sta, u8 pn_offs,
3555			   struct ieee80211_key *key,
3556			   struct ieee80211_tx_data *tx)
3557{
3558	struct sk_buff *skb = tx->skb;
3559	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3560	struct ieee80211_hdr *hdr = (void *)skb->data;
3561	u8 tid = IEEE80211_NUM_TIDS;
3562
3563	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) &&
3564	    ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE)
3565		return TX_DROP;
3566
3567	if (key)
3568		info->control.hw_key = &key->conf;
3569
3570	dev_sw_netstats_tx_add(skb->dev, 1, skb->len);
3571
3572	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3573		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3574		hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3575	} else {
3576		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3577		hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3578		sdata->sequence_number += 0x10;
3579	}
3580
3581	if (skb_shinfo(skb)->gso_size)
3582		sta->deflink.tx_stats.msdu[tid] +=
3583			DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3584	else
3585		sta->deflink.tx_stats.msdu[tid]++;
3586
3587	info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3588
3589	/* statistics normally done by ieee80211_tx_h_stats (but that
3590	 * has to consider fragmentation, so is more complex)
3591	 */
3592	sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3593	sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++;
3594
3595	if (pn_offs) {
3596		u64 pn;
3597		u8 *crypto_hdr = skb->data + pn_offs;
3598
3599		switch (key->conf.cipher) {
3600		case WLAN_CIPHER_SUITE_CCMP:
3601		case WLAN_CIPHER_SUITE_CCMP_256:
3602		case WLAN_CIPHER_SUITE_GCMP:
3603		case WLAN_CIPHER_SUITE_GCMP_256:
3604			pn = atomic64_inc_return(&key->conf.tx_pn);
3605			crypto_hdr[0] = pn;
3606			crypto_hdr[1] = pn >> 8;
3607			crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6);
3608			crypto_hdr[4] = pn >> 16;
3609			crypto_hdr[5] = pn >> 24;
3610			crypto_hdr[6] = pn >> 32;
3611			crypto_hdr[7] = pn >> 40;
3612			break;
3613		}
3614	}
3615
3616	return TX_CONTINUE;
3617}
3618
3619static netdev_features_t
3620ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata)
3621{
3622	if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3623		return sdata->vif.netdev_features;
3624
3625	if (!sdata->bss)
3626		return 0;
3627
3628	sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
3629	return sdata->vif.netdev_features;
3630}
3631
3632static struct sk_buff *
3633ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features)
3634{
3635	if (skb_is_gso(skb)) {
3636		struct sk_buff *segs;
3637
3638		segs = skb_gso_segment(skb, features);
3639		if (!segs)
3640			return skb;
3641		if (IS_ERR(segs))
3642			goto free;
3643
3644		consume_skb(skb);
3645		return segs;
3646	}
3647
3648	if (skb_needs_linearize(skb, features) && __skb_linearize(skb))
3649		goto free;
3650
3651	if (skb->ip_summed == CHECKSUM_PARTIAL) {
3652		int ofs = skb_checksum_start_offset(skb);
3653
3654		if (skb->encapsulation)
3655			skb_set_inner_transport_header(skb, ofs);
3656		else
3657			skb_set_transport_header(skb, ofs);
3658
3659		if (skb_csum_hwoffload_help(skb, features))
3660			goto free;
3661	}
3662
3663	skb_mark_not_on_list(skb);
3664	return skb;
3665
3666free:
3667	kfree_skb(skb);
3668	return NULL;
3669}
3670
3671void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3672			   struct sta_info *sta,
3673			   struct ieee80211_fast_tx *fast_tx,
3674			   struct sk_buff *skb, bool ampdu,
3675			   const u8 *da, const u8 *sa)
3676{
3677	struct ieee80211_local *local = sdata->local;
3678	struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3679	struct ieee80211_tx_info *info;
3680	struct ieee80211_tx_data tx;
3681	ieee80211_tx_result r;
3682	int hw_headroom = sdata->local->hw.extra_tx_headroom;
3683	int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3684
3685	skb = skb_share_check(skb, GFP_ATOMIC);
3686	if (unlikely(!skb))
3687		return;
3688
3689	if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3690	    ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa))
3691		return;
3692
3693	/* will not be crypto-handled beyond what we do here, so use false
3694	 * as the may-encrypt argument for the resize to not account for
3695	 * more room than we already have in 'extra_head'
3696	 */
3697	if (unlikely(ieee80211_skb_resize(sdata, skb,
3698					  max_t(int, extra_head + hw_headroom -
3699						     skb_headroom(skb), 0),
3700					  ENCRYPT_NO)))
3701		goto free;
3702
3703	hdr = skb_push(skb, extra_head);
3704	memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3705	memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN);
3706	memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN);
3707
3708	info = IEEE80211_SKB_CB(skb);
3709	memset(info, 0, sizeof(*info));
3710	info->band = fast_tx->band;
3711	info->control.vif = &sdata->vif;
3712	info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3713		      IEEE80211_TX_CTL_DONTFRAG;
3714	info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT |
3715			      u32_encode_bits(IEEE80211_LINK_UNSPECIFIED,
3716					      IEEE80211_TX_CTRL_MLO_LINK);
3717
3718#ifdef CONFIG_MAC80211_DEBUGFS
3719	if (local->force_tx_status)
3720		info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
3721#endif
3722
3723	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3724		u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3725
3726		*ieee80211_get_qos_ctl(hdr) = tid;
3727	}
3728
3729	__skb_queue_head_init(&tx.skbs);
3730
3731	tx.flags = IEEE80211_TX_UNICAST;
3732	tx.local = local;
3733	tx.sdata = sdata;
3734	tx.sta = sta;
3735	tx.key = fast_tx->key;
3736
3737	if (ieee80211_queue_skb(local, sdata, sta, skb))
3738		return;
3739
3740	tx.skb = skb;
3741	r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3742				       fast_tx->key, &tx);
3743	tx.skb = NULL;
3744	if (r == TX_DROP) {
3745		tx.sdata->tx_handlers_drop++;
3746		goto free;
3747	}
3748
3749	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3750		sdata = container_of(sdata->bss,
3751				     struct ieee80211_sub_if_data, u.ap);
3752
3753	__skb_queue_tail(&tx.skbs, skb);
3754	ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false);
3755	return;
3756
3757free:
3758	kfree_skb(skb);
3759}
3760
3761static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3762				struct sta_info *sta,
3763				struct ieee80211_fast_tx *fast_tx,
3764				struct sk_buff *skb)
3765{
3766	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3767	struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3768	struct tid_ampdu_tx *tid_tx = NULL;
3769	struct sk_buff *next;
3770	struct ethhdr eth;
3771	u8 tid = IEEE80211_NUM_TIDS;
3772
3773	/* control port protocol needs a lot of special handling */
3774	if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3775		return false;
3776
3777	/* only RFC 1042 SNAP */
3778	if (ethertype < ETH_P_802_3_MIN)
3779		return false;
3780
3781	/* don't handle TX status request here either */
3782	if (sk_requests_wifi_status(skb->sk))
3783		return false;
3784
3785	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3786		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3787		tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3788		if (tid_tx) {
3789			if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3790				return false;
3791			if (tid_tx->timeout)
3792				tid_tx->last_tx = jiffies;
3793		}
3794	}
3795
3796	memcpy(&eth, skb->data, ETH_HLEN - 2);
3797
3798	/* after this point (skb is modified) we cannot return false */
3799	skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata));
3800	if (!skb)
3801		return true;
3802
3803	skb_list_walk_safe(skb, skb, next) {
3804		skb_mark_not_on_list(skb);
3805		__ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx,
3806				      eth.h_dest, eth.h_source);
3807	}
3808
3809	return true;
3810}
3811
3812struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3813				     struct ieee80211_txq *txq)
3814{
3815	struct ieee80211_local *local = hw_to_local(hw);
3816	struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3817	struct ieee80211_hdr *hdr;
3818	struct sk_buff *skb = NULL;
3819	struct fq *fq = &local->fq;
3820	struct fq_tin *tin = &txqi->tin;
3821	struct ieee80211_tx_info *info;
3822	struct ieee80211_tx_data tx;
3823	ieee80211_tx_result r;
3824	struct ieee80211_vif *vif = txq->vif;
3825	int q = vif->hw_queue[txq->ac];
3826	unsigned long flags;
3827	bool q_stopped;
3828
3829	WARN_ON_ONCE(softirq_count() == 0);
3830
3831	if (!ieee80211_txq_airtime_check(hw, txq))
3832		return NULL;
3833
3834begin:
3835	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3836	q_stopped = local->queue_stop_reasons[q];
3837	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3838
3839	if (unlikely(q_stopped)) {
3840		/* mark for waking later */
3841		set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags);
3842		return NULL;
3843	}
3844
3845	spin_lock_bh(&fq->lock);
3846
3847	/* Make sure fragments stay together. */
3848	skb = __skb_dequeue(&txqi->frags);
3849	if (unlikely(skb)) {
3850		if (!(IEEE80211_SKB_CB(skb)->control.flags &
3851				IEEE80211_TX_INTCFL_NEED_TXPROCESSING))
3852			goto out;
3853		IEEE80211_SKB_CB(skb)->control.flags &=
3854			~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
3855	} else {
3856		if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags)))
3857			goto out;
3858
3859		skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3860	}
3861
3862	if (!skb)
3863		goto out;
3864
3865	spin_unlock_bh(&fq->lock);
3866
3867	hdr = (struct ieee80211_hdr *)skb->data;
3868	info = IEEE80211_SKB_CB(skb);
3869
3870	memset(&tx, 0, sizeof(tx));
3871	__skb_queue_head_init(&tx.skbs);
3872	tx.local = local;
3873	tx.skb = skb;
3874	tx.sdata = vif_to_sdata(info->control.vif);
3875
3876	if (txq->sta) {
3877		tx.sta = container_of(txq->sta, struct sta_info, sta);
3878		/*
3879		 * Drop unicast frames to unauthorised stations unless they are
3880		 * injected frames or EAPOL frames from the local station.
3881		 */
3882		if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
3883			     ieee80211_is_data(hdr->frame_control) &&
3884			     !ieee80211_vif_is_mesh(&tx.sdata->vif) &&
3885			     tx.sdata->vif.type != NL80211_IFTYPE_OCB &&
3886			     !is_multicast_ether_addr(hdr->addr1) &&
3887			     !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) &&
3888			     (!(info->control.flags &
3889				IEEE80211_TX_CTRL_PORT_CTRL_PROTO) ||
3890			      !ieee80211_is_our_addr(tx.sdata, hdr->addr2,
3891						     NULL)))) {
3892			I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
3893			ieee80211_free_txskb(&local->hw, skb);
3894			goto begin;
3895		}
3896	}
3897
3898	/*
3899	 * The key can be removed while the packet was queued, so need to call
3900	 * this here to get the current key.
3901	 */
3902	info->control.hw_key = NULL;
3903	r = ieee80211_tx_h_select_key(&tx);
3904	if (r != TX_CONTINUE) {
3905		ieee80211_free_txskb(&local->hw, skb);
3906		goto begin;
3907	}
3908
3909	if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3910		info->flags |= (IEEE80211_TX_CTL_AMPDU |
3911				IEEE80211_TX_CTL_DONTFRAG);
3912
3913	if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
3914		if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3915			r = ieee80211_tx_h_rate_ctrl(&tx);
3916			if (r != TX_CONTINUE) {
3917				ieee80211_free_txskb(&local->hw, skb);
3918				goto begin;
3919			}
3920		}
3921		goto encap_out;
3922	}
3923
3924	if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3925		struct sta_info *sta = container_of(txq->sta, struct sta_info,
3926						    sta);
3927		u8 pn_offs = 0;
3928
3929		if (tx.key &&
3930		    (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3931			pn_offs = ieee80211_hdrlen(hdr->frame_control);
3932
3933		r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3934					       tx.key, &tx);
3935		if (r != TX_CONTINUE) {
3936			ieee80211_free_txskb(&local->hw, skb);
3937			goto begin;
3938		}
3939	} else {
3940		if (invoke_tx_handlers_late(&tx))
3941			goto begin;
3942
3943		skb = __skb_dequeue(&tx.skbs);
3944		info = IEEE80211_SKB_CB(skb);
3945
3946		if (!skb_queue_empty(&tx.skbs)) {
3947			spin_lock_bh(&fq->lock);
3948			skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3949			spin_unlock_bh(&fq->lock);
3950		}
3951	}
3952
3953	if (skb_has_frag_list(skb) &&
3954	    !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3955		if (skb_linearize(skb)) {
3956			ieee80211_free_txskb(&local->hw, skb);
3957			goto begin;
3958		}
3959	}
3960
3961	switch (tx.sdata->vif.type) {
3962	case NL80211_IFTYPE_MONITOR:
3963		if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) ||
3964		    ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) {
3965			vif = &tx.sdata->vif;
3966			break;
3967		}
3968		tx.sdata = rcu_dereference(local->monitor_sdata);
3969		if (tx.sdata &&
3970		    ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) {
3971			vif = &tx.sdata->vif;
3972			info->hw_queue =
3973				vif->hw_queue[skb_get_queue_mapping(skb)];
3974		} else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3975			ieee80211_free_txskb(&local->hw, skb);
3976			goto begin;
3977		} else {
3978			info->control.vif = NULL;
3979			return skb;
3980		}
3981		break;
3982	case NL80211_IFTYPE_AP_VLAN:
3983		tx.sdata = container_of(tx.sdata->bss,
3984					struct ieee80211_sub_if_data, u.ap);
3985		fallthrough;
3986	default:
3987		vif = &tx.sdata->vif;
3988		break;
3989	}
3990
3991encap_out:
3992	info->control.vif = vif;
3993
3994	if (tx.sta &&
3995	    wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) {
3996		bool ampdu = txq->ac != IEEE80211_AC_VO;
3997		u32 airtime;
3998
3999		airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta,
4000							     skb->len, ampdu);
4001		if (airtime) {
4002			airtime = ieee80211_info_set_tx_time_est(info, airtime);
4003			ieee80211_sta_update_pending_airtime(local, tx.sta,
4004							     txq->ac,
4005							     airtime,
4006							     false);
4007		}
4008	}
4009
4010	return skb;
4011
4012out:
4013	spin_unlock_bh(&fq->lock);
4014
4015	return skb;
4016}
4017EXPORT_SYMBOL(ieee80211_tx_dequeue);
4018
4019static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac)
4020{
4021	struct airtime_info *air_info = &sta->airtime[ac];
4022
4023	return air_info->deficit - atomic_read(&air_info->aql_tx_pending);
4024}
4025
4026static void
4027ieee80211_txq_set_active(struct txq_info *txqi)
4028{
4029	struct sta_info *sta;
4030
4031	if (!txqi->txq.sta)
4032		return;
4033
4034	sta = container_of(txqi->txq.sta, struct sta_info, sta);
4035	sta->airtime[txqi->txq.ac].last_active = jiffies;
4036}
4037
4038static bool
4039ieee80211_txq_keep_active(struct txq_info *txqi)
4040{
4041	struct sta_info *sta;
4042
4043	if (!txqi->txq.sta)
4044		return false;
4045
4046	sta = container_of(txqi->txq.sta, struct sta_info, sta);
4047	if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0)
4048		return false;
4049
4050	return ieee80211_sta_keep_active(sta, txqi->txq.ac);
4051}
4052
4053struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
4054{
4055	struct ieee80211_local *local = hw_to_local(hw);
4056	struct ieee80211_txq *ret = NULL;
4057	struct txq_info *txqi = NULL, *head = NULL;
4058	bool found_eligible_txq = false;
4059
4060	spin_lock_bh(&local->active_txq_lock[ac]);
4061
4062	if (!local->schedule_round[ac])
4063		goto out;
4064
4065 begin:
4066	txqi = list_first_entry_or_null(&local->active_txqs[ac],
4067					struct txq_info,
4068					schedule_order);
4069	if (!txqi)
4070		goto out;
4071
4072	if (txqi == head) {
4073		if (!found_eligible_txq)
4074			goto out;
4075		else
4076			found_eligible_txq = false;
4077	}
4078
4079	if (!head)
4080		head = txqi;
4081
4082	if (txqi->txq.sta) {
4083		struct sta_info *sta = container_of(txqi->txq.sta,
4084						    struct sta_info, sta);
4085		bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq);
4086		s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac);
4087
4088		if (aql_check)
4089			found_eligible_txq = true;
4090
4091		if (deficit < 0)
4092			sta->airtime[txqi->txq.ac].deficit +=
4093				sta->airtime_weight;
4094
4095		if (deficit < 0 || !aql_check) {
4096			list_move_tail(&txqi->schedule_order,
4097				       &local->active_txqs[txqi->txq.ac]);
4098			goto begin;
4099		}
4100	}
4101
4102	if (txqi->schedule_round == local->schedule_round[ac])
4103		goto out;
4104
4105	list_del_init(&txqi->schedule_order);
4106	txqi->schedule_round = local->schedule_round[ac];
4107	ret = &txqi->txq;
4108
4109out:
4110	spin_unlock_bh(&local->active_txq_lock[ac]);
4111	return ret;
4112}
4113EXPORT_SYMBOL(ieee80211_next_txq);
4114
4115void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
4116			      struct ieee80211_txq *txq,
4117			      bool force)
4118{
4119	struct ieee80211_local *local = hw_to_local(hw);
4120	struct txq_info *txqi = to_txq_info(txq);
4121	bool has_queue;
4122
4123	spin_lock_bh(&local->active_txq_lock[txq->ac]);
4124
4125	has_queue = force ||
4126		    (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) &&
4127		     txq_has_queue(txq));
4128	if (list_empty(&txqi->schedule_order) &&
4129	    (has_queue || ieee80211_txq_keep_active(txqi))) {
4130		/* If airtime accounting is active, always enqueue STAs at the
4131		 * head of the list to ensure that they only get moved to the
4132		 * back by the airtime DRR scheduler once they have a negative
4133		 * deficit. A station that already has a negative deficit will
4134		 * get immediately moved to the back of the list on the next
4135		 * call to ieee80211_next_txq().
4136		 */
4137		if (txqi->txq.sta && local->airtime_flags && has_queue &&
4138		    wiphy_ext_feature_isset(local->hw.wiphy,
4139					    NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
4140			list_add(&txqi->schedule_order,
4141				 &local->active_txqs[txq->ac]);
4142		else
4143			list_add_tail(&txqi->schedule_order,
4144				      &local->active_txqs[txq->ac]);
4145		if (has_queue)
4146			ieee80211_txq_set_active(txqi);
4147	}
4148
4149	spin_unlock_bh(&local->active_txq_lock[txq->ac]);
4150}
4151EXPORT_SYMBOL(__ieee80211_schedule_txq);
4152
4153DEFINE_STATIC_KEY_FALSE(aql_disable);
4154
4155bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw,
4156				 struct ieee80211_txq *txq)
4157{
4158	struct sta_info *sta;
4159	struct ieee80211_local *local = hw_to_local(hw);
4160
4161	if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
4162		return true;
4163
4164	if (static_branch_unlikely(&aql_disable))
4165		return true;
4166
4167	if (!txq->sta)
4168		return true;
4169
4170	if (unlikely(txq->tid == IEEE80211_NUM_TIDS))
4171		return true;
4172
4173	sta = container_of(txq->sta, struct sta_info, sta);
4174	if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
4175	    sta->airtime[txq->ac].aql_limit_low)
4176		return true;
4177
4178	if (atomic_read(&local->aql_total_pending_airtime) <
4179	    local->aql_threshold &&
4180	    atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
4181	    sta->airtime[txq->ac].aql_limit_high)
4182		return true;
4183
4184	return false;
4185}
4186EXPORT_SYMBOL(ieee80211_txq_airtime_check);
4187
4188static bool
4189ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac)
4190{
4191	unsigned int num_txq = 0;
4192	struct txq_info *txq;
4193	u32 aql_limit;
4194
4195	if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
4196		return true;
4197
4198	list_for_each_entry(txq, &local->active_txqs[ac], schedule_order)
4199		num_txq++;
4200
4201	aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 +
4202		    local->aql_txq_limit_high[ac];
4203
4204	return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit;
4205}
4206
4207bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw,
4208				struct ieee80211_txq *txq)
4209{
4210	struct ieee80211_local *local = hw_to_local(hw);
4211	struct txq_info *iter, *tmp, *txqi = to_txq_info(txq);
4212	struct sta_info *sta;
4213	u8 ac = txq->ac;
4214
4215	spin_lock_bh(&local->active_txq_lock[ac]);
4216
4217	if (!txqi->txq.sta)
4218		goto out;
4219
4220	if (list_empty(&txqi->schedule_order))
4221		goto out;
4222
4223	if (!ieee80211_txq_schedule_airtime_check(local, ac))
4224		goto out;
4225
4226	list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac],
4227				 schedule_order) {
4228		if (iter == txqi)
4229			break;
4230
4231		if (!iter->txq.sta) {
4232			list_move_tail(&iter->schedule_order,
4233				       &local->active_txqs[ac]);
4234			continue;
4235		}
4236		sta = container_of(iter->txq.sta, struct sta_info, sta);
4237		if (ieee80211_sta_deficit(sta, ac) < 0)
4238			sta->airtime[ac].deficit += sta->airtime_weight;
4239		list_move_tail(&iter->schedule_order, &local->active_txqs[ac]);
4240	}
4241
4242	sta = container_of(txqi->txq.sta, struct sta_info, sta);
4243	if (sta->airtime[ac].deficit >= 0)
4244		goto out;
4245
4246	sta->airtime[ac].deficit += sta->airtime_weight;
4247	list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]);
4248	spin_unlock_bh(&local->active_txq_lock[ac]);
4249
4250	return false;
4251out:
4252	if (!list_empty(&txqi->schedule_order))
4253		list_del_init(&txqi->schedule_order);
4254	spin_unlock_bh(&local->active_txq_lock[ac]);
4255
4256	return true;
4257}
4258EXPORT_SYMBOL(ieee80211_txq_may_transmit);
4259
4260void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac)
4261{
4262	struct ieee80211_local *local = hw_to_local(hw);
4263
4264	spin_lock_bh(&local->active_txq_lock[ac]);
4265
4266	if (ieee80211_txq_schedule_airtime_check(local, ac)) {
4267		local->schedule_round[ac]++;
4268		if (!local->schedule_round[ac])
4269			local->schedule_round[ac]++;
4270	} else {
4271		local->schedule_round[ac] = 0;
4272	}
4273
4274	spin_unlock_bh(&local->active_txq_lock[ac]);
4275}
4276EXPORT_SYMBOL(ieee80211_txq_schedule_start);
4277
4278void __ieee80211_subif_start_xmit(struct sk_buff *skb,
4279				  struct net_device *dev,
4280				  u32 info_flags,
4281				  u32 ctrl_flags,
4282				  u64 *cookie)
4283{
4284	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4285	struct ieee80211_local *local = sdata->local;
4286	struct sta_info *sta;
4287	struct sk_buff *next;
4288	int len = skb->len;
4289
4290	if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) {
4291		kfree_skb(skb);
4292		return;
4293	}
4294
4295	sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
4296
4297	rcu_read_lock();
4298
4299	if (ieee80211_vif_is_mesh(&sdata->vif) &&
4300	    ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) &&
4301	    ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags))
4302		goto out;
4303
4304	if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
4305		goto out_free;
4306
4307	if (IS_ERR(sta))
4308		sta = NULL;
4309
4310	skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb));
4311	ieee80211_aggr_check(sdata, sta, skb);
4312
4313	if (sta) {
4314		struct ieee80211_fast_tx *fast_tx;
4315
4316		fast_tx = rcu_dereference(sta->fast_tx);
4317
4318		if (fast_tx &&
4319		    ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
4320			goto out;
4321	}
4322
4323	/* the frame could be fragmented, software-encrypted, and other
4324	 * things so we cannot really handle checksum or GSO offload.
4325	 * fix it up in software before we handle anything else.
4326	 */
4327	skb = ieee80211_tx_skb_fixup(skb, 0);
4328	if (!skb) {
4329		len = 0;
4330		goto out;
4331	}
4332
4333	skb_list_walk_safe(skb, skb, next) {
4334		skb_mark_not_on_list(skb);
4335
4336		if (skb->protocol == sdata->control_port_protocol)
4337			ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
4338
4339		skb = ieee80211_build_hdr(sdata, skb, info_flags,
4340					  sta, ctrl_flags, cookie);
4341		if (IS_ERR(skb)) {
4342			kfree_skb_list(next);
4343			goto out;
4344		}
4345
4346		dev_sw_netstats_tx_add(dev, 1, skb->len);
4347
4348		ieee80211_xmit(sdata, sta, skb);
4349	}
4350	goto out;
4351 out_free:
4352	kfree_skb(skb);
4353	len = 0;
4354 out:
4355	if (len)
4356		ieee80211_tpt_led_trig_tx(local, len);
4357	rcu_read_unlock();
4358}
4359
4360static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
4361{
4362	struct ethhdr *eth;
4363	int err;
4364
4365	err = skb_ensure_writable(skb, ETH_HLEN);
4366	if (unlikely(err))
4367		return err;
4368
4369	eth = (void *)skb->data;
4370	ether_addr_copy(eth->h_dest, sta->sta.addr);
4371
4372	return 0;
4373}
4374
4375static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
4376					   struct net_device *dev)
4377{
4378	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4379	const struct ethhdr *eth = (void *)skb->data;
4380	const struct vlan_ethhdr *ethvlan = (void *)skb->data;
4381	__be16 ethertype;
4382
4383	switch (sdata->vif.type) {
4384	case NL80211_IFTYPE_AP_VLAN:
4385		if (sdata->u.vlan.sta)
4386			return false;
4387		if (sdata->wdev.use_4addr)
4388			return false;
4389		fallthrough;
4390	case NL80211_IFTYPE_AP:
4391		/* check runtime toggle for this bss */
4392		if (!sdata->bss->multicast_to_unicast)
4393			return false;
4394		break;
4395	default:
4396		return false;
4397	}
4398
4399	/* multicast to unicast conversion only for some payload */
4400	ethertype = eth->h_proto;
4401	if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
4402		ethertype = ethvlan->h_vlan_encapsulated_proto;
4403	switch (ethertype) {
4404	case htons(ETH_P_ARP):
4405	case htons(ETH_P_IP):
4406	case htons(ETH_P_IPV6):
4407		break;
4408	default:
4409		return false;
4410	}
4411
4412	return true;
4413}
4414
4415static void
4416ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
4417			     struct sk_buff_head *queue)
4418{
4419	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4420	struct ieee80211_local *local = sdata->local;
4421	const struct ethhdr *eth = (struct ethhdr *)skb->data;
4422	struct sta_info *sta, *first = NULL;
4423	struct sk_buff *cloned_skb;
4424
4425	rcu_read_lock();
4426
4427	list_for_each_entry_rcu(sta, &local->sta_list, list) {
4428		if (sdata != sta->sdata)
4429			/* AP-VLAN mismatch */
4430			continue;
4431		if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
4432			/* do not send back to source */
4433			continue;
4434		if (!first) {
4435			first = sta;
4436			continue;
4437		}
4438		cloned_skb = skb_clone(skb, GFP_ATOMIC);
4439		if (!cloned_skb)
4440			goto multicast;
4441		if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
4442			dev_kfree_skb(cloned_skb);
4443			goto multicast;
4444		}
4445		__skb_queue_tail(queue, cloned_skb);
4446	}
4447
4448	if (likely(first)) {
4449		if (unlikely(ieee80211_change_da(skb, first)))
4450			goto multicast;
4451		__skb_queue_tail(queue, skb);
4452	} else {
4453		/* no STA connected, drop */
4454		kfree_skb(skb);
4455		skb = NULL;
4456	}
4457
4458	goto out;
4459multicast:
4460	__skb_queue_purge(queue);
4461	__skb_queue_tail(queue, skb);
4462out:
4463	rcu_read_unlock();
4464}
4465
4466static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata,
4467					   struct sk_buff *skb, u32 ctrl_flags,
4468					   unsigned int link_id)
4469{
4470	struct sk_buff *out;
4471
4472	out = skb_copy(skb, GFP_ATOMIC);
4473	if (!out)
4474		return;
4475
4476	ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK);
4477	__ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL);
4478}
4479
4480static void ieee80211_mlo_multicast_tx(struct net_device *dev,
4481				       struct sk_buff *skb)
4482{
4483	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4484	unsigned long links = sdata->vif.active_links;
4485	unsigned int link;
4486	u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX;
4487
4488	if (hweight16(links) == 1) {
4489		ctrl_flags |= u32_encode_bits(__ffs(links),
4490					      IEEE80211_TX_CTRL_MLO_LINK);
4491
4492		__ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags,
4493					     NULL);
4494		return;
4495	}
4496
4497	for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) {
4498		ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link);
4499		ctrl_flags = 0;
4500	}
4501	kfree_skb(skb);
4502}
4503
4504/**
4505 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
4506 * @skb: packet to be sent
4507 * @dev: incoming interface
4508 *
4509 * On failure skb will be freed.
4510 *
4511 * Returns: the netdev TX status (but really only %NETDEV_TX_OK)
4512 */
4513netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
4514				       struct net_device *dev)
4515{
4516	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4517	const struct ethhdr *eth = (void *)skb->data;
4518
4519	if (likely(!is_multicast_ether_addr(eth->h_dest)))
4520		goto normal;
4521
4522	if (unlikely(!ieee80211_sdata_running(sdata))) {
4523		kfree_skb(skb);
4524		return NETDEV_TX_OK;
4525	}
4526
4527	if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
4528		struct sk_buff_head queue;
4529
4530		__skb_queue_head_init(&queue);
4531		ieee80211_convert_to_unicast(skb, dev, &queue);
4532		while ((skb = __skb_dequeue(&queue)))
4533			__ieee80211_subif_start_xmit(skb, dev, 0,
4534						     IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4535						     NULL);
4536	} else if (ieee80211_vif_is_mld(&sdata->vif) &&
4537		   ((sdata->vif.type == NL80211_IFTYPE_AP &&
4538		     !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) ||
4539		    (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4540		     !sdata->wdev.use_4addr))) {
4541		ieee80211_mlo_multicast_tx(dev, skb);
4542	} else {
4543normal:
4544		__ieee80211_subif_start_xmit(skb, dev, 0,
4545					     IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4546					     NULL);
4547	}
4548
4549	return NETDEV_TX_OK;
4550}
4551
4552
4553
4554static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
4555				struct sk_buff *skb, struct sta_info *sta,
4556				bool txpending)
4557{
4558	struct ieee80211_local *local = sdata->local;
4559	struct ieee80211_tx_control control = {};
4560	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4561	struct ieee80211_sta *pubsta = NULL;
4562	unsigned long flags;
4563	int q = info->hw_queue;
4564
4565	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4566
4567	if (local->queue_stop_reasons[q] ||
4568	    (!txpending && !skb_queue_empty(&local->pending[q]))) {
4569		if (txpending)
4570			skb_queue_head(&local->pending[q], skb);
4571		else
4572			skb_queue_tail(&local->pending[q], skb);
4573
4574		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4575
4576		return false;
4577	}
4578
4579	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4580
4581	if (sta && sta->uploaded)
4582		pubsta = &sta->sta;
4583
4584	control.sta = pubsta;
4585
4586	drv_tx(local, &control, skb);
4587
4588	return true;
4589}
4590
4591static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
4592			      struct sk_buff *skb, struct sta_info *sta,
4593			      bool txpending)
4594{
4595	struct ieee80211_local *local = sdata->local;
4596	struct sk_buff *next;
4597	bool ret = true;
4598
4599	if (ieee80211_queue_skb(local, sdata, sta, skb))
4600		return true;
4601
4602	skb_list_walk_safe(skb, skb, next) {
4603		skb_mark_not_on_list(skb);
4604		if (!__ieee80211_tx_8023(sdata, skb, sta, txpending))
4605			ret = false;
4606	}
4607
4608	return ret;
4609}
4610
4611static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
4612				struct net_device *dev, struct sta_info *sta,
4613				struct ieee80211_key *key, struct sk_buff *skb)
4614{
4615	struct ieee80211_tx_info *info;
4616	struct ieee80211_local *local = sdata->local;
4617	struct tid_ampdu_tx *tid_tx;
4618	struct sk_buff *seg, *next;
4619	unsigned int skbs = 0, len = 0;
4620	u16 queue;
4621	u8 tid;
4622
4623	queue = ieee80211_select_queue(sdata, sta, skb);
4624	skb_set_queue_mapping(skb, queue);
4625
4626	if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) &&
4627	    test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
4628		goto out_free;
4629
4630	skb = skb_share_check(skb, GFP_ATOMIC);
4631	if (unlikely(!skb))
4632		return;
4633
4634	ieee80211_aggr_check(sdata, sta, skb);
4635
4636	tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
4637	tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
4638	if (tid_tx) {
4639		if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
4640			/* fall back to non-offload slow path */
4641			__ieee80211_subif_start_xmit(skb, dev, 0,
4642						     IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4643						     NULL);
4644			return;
4645		}
4646
4647		if (tid_tx->timeout)
4648			tid_tx->last_tx = jiffies;
4649	}
4650
4651	skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata));
4652	if (!skb)
4653		return;
4654
4655	info = IEEE80211_SKB_CB(skb);
4656	memset(info, 0, sizeof(*info));
4657
4658	info->hw_queue = sdata->vif.hw_queue[queue];
4659
4660	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4661		sdata = container_of(sdata->bss,
4662				     struct ieee80211_sub_if_data, u.ap);
4663
4664	info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP;
4665	info->control.vif = &sdata->vif;
4666
4667	if (key)
4668		info->control.hw_key = &key->conf;
4669
4670	skb_list_walk_safe(skb, seg, next) {
4671		skbs++;
4672		len += seg->len;
4673		if (seg != skb)
4674			memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info));
4675	}
4676
4677	if (unlikely(sk_requests_wifi_status(skb->sk))) {
4678		info->status_data = ieee80211_store_ack_skb(local, skb,
4679							    &info->flags, NULL);
4680		if (info->status_data)
4681			info->status_data_idr = 1;
4682	}
4683
4684	dev_sw_netstats_tx_add(dev, skbs, len);
4685	sta->deflink.tx_stats.packets[queue] += skbs;
4686	sta->deflink.tx_stats.bytes[queue] += len;
4687
4688	ieee80211_tpt_led_trig_tx(local, len);
4689
4690	ieee80211_tx_8023(sdata, skb, sta, false);
4691
4692	return;
4693
4694out_free:
4695	kfree_skb(skb);
4696}
4697
4698netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
4699					    struct net_device *dev)
4700{
4701	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4702	struct ethhdr *ehdr = (struct ethhdr *)skb->data;
4703	struct ieee80211_key *key;
4704	struct sta_info *sta;
4705
4706	if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) {
4707		kfree_skb(skb);
4708		return NETDEV_TX_OK;
4709	}
4710
4711	rcu_read_lock();
4712
4713	if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4714		kfree_skb(skb);
4715		goto out;
4716	}
4717
4718	if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded ||
4719	    !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
4720	    sdata->control_port_protocol == ehdr->h_proto))
4721		goto skip_offload;
4722
4723	key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4724	if (!key)
4725		key = rcu_dereference(sdata->default_unicast_key);
4726
4727	if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) ||
4728		    key->conf.cipher == WLAN_CIPHER_SUITE_TKIP))
4729		goto skip_offload;
4730
4731	sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
4732	ieee80211_8023_xmit(sdata, dev, sta, key, skb);
4733	goto out;
4734
4735skip_offload:
4736	ieee80211_subif_start_xmit(skb, dev);
4737out:
4738	rcu_read_unlock();
4739
4740	return NETDEV_TX_OK;
4741}
4742
4743struct sk_buff *
4744ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
4745			      struct sk_buff *skb, u32 info_flags)
4746{
4747	struct ieee80211_hdr *hdr;
4748	struct ieee80211_tx_data tx = {
4749		.local = sdata->local,
4750		.sdata = sdata,
4751	};
4752	struct sta_info *sta;
4753
4754	rcu_read_lock();
4755
4756	if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4757		kfree_skb(skb);
4758		skb = ERR_PTR(-EINVAL);
4759		goto out;
4760	}
4761
4762	skb = ieee80211_build_hdr(sdata, skb, info_flags, sta,
4763				  IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
4764	if (IS_ERR(skb))
4765		goto out;
4766
4767	hdr = (void *)skb->data;
4768	tx.sta = sta_info_get(sdata, hdr->addr1);
4769	tx.skb = skb;
4770
4771	if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
4772		rcu_read_unlock();
4773		kfree_skb(skb);
4774		return ERR_PTR(-EINVAL);
4775	}
4776
4777out:
4778	rcu_read_unlock();
4779	return skb;
4780}
4781
4782/*
4783 * ieee80211_clear_tx_pending may not be called in a context where
4784 * it is possible that it packets could come in again.
4785 */
4786void ieee80211_clear_tx_pending(struct ieee80211_local *local)
4787{
4788	struct sk_buff *skb;
4789	int i;
4790
4791	for (i = 0; i < local->hw.queues; i++) {
4792		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
4793			ieee80211_free_txskb(&local->hw, skb);
4794	}
4795}
4796
4797/*
4798 * Returns false if the frame couldn't be transmitted but was queued instead,
4799 * which in this case means re-queued -- take as an indication to stop sending
4800 * more pending frames.
4801 */
4802static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
4803				     struct sk_buff *skb)
4804{
4805	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4806	struct ieee80211_sub_if_data *sdata;
4807	struct sta_info *sta;
4808	struct ieee80211_hdr *hdr;
4809	bool result;
4810	struct ieee80211_chanctx_conf *chanctx_conf;
4811
4812	sdata = vif_to_sdata(info->control.vif);
4813
4814	if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) {
4815		/* update band only for non-MLD */
4816		if (!ieee80211_vif_is_mld(&sdata->vif)) {
4817			chanctx_conf =
4818				rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
4819			if (unlikely(!chanctx_conf)) {
4820				dev_kfree_skb(skb);
4821				return true;
4822			}
4823			info->band = chanctx_conf->def.chan->band;
4824		}
4825		result = ieee80211_tx(sdata, NULL, skb, true);
4826	} else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
4827		if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4828			dev_kfree_skb(skb);
4829			return true;
4830		}
4831
4832		if (IS_ERR(sta) || (sta && !sta->uploaded))
4833			sta = NULL;
4834
4835		result = ieee80211_tx_8023(sdata, skb, sta, true);
4836	} else {
4837		struct sk_buff_head skbs;
4838
4839		__skb_queue_head_init(&skbs);
4840		__skb_queue_tail(&skbs, skb);
4841
4842		hdr = (struct ieee80211_hdr *)skb->data;
4843		sta = sta_info_get(sdata, hdr->addr1);
4844
4845		result = __ieee80211_tx(local, &skbs, sta, true);
4846	}
4847
4848	return result;
4849}
4850
4851/*
4852 * Transmit all pending packets. Called from tasklet.
4853 */
4854void ieee80211_tx_pending(struct tasklet_struct *t)
4855{
4856	struct ieee80211_local *local = from_tasklet(local, t,
4857						     tx_pending_tasklet);
4858	unsigned long flags;
4859	int i;
4860	bool txok;
4861
4862	rcu_read_lock();
4863
4864	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4865	for (i = 0; i < local->hw.queues; i++) {
4866		/*
4867		 * If queue is stopped by something other than due to pending
4868		 * frames, or we have no pending frames, proceed to next queue.
4869		 */
4870		if (local->queue_stop_reasons[i] ||
4871		    skb_queue_empty(&local->pending[i]))
4872			continue;
4873
4874		while (!skb_queue_empty(&local->pending[i])) {
4875			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
4876			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4877
4878			if (WARN_ON(!info->control.vif)) {
4879				ieee80211_free_txskb(&local->hw, skb);
4880				continue;
4881			}
4882
4883			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
4884						flags);
4885
4886			txok = ieee80211_tx_pending_skb(local, skb);
4887			spin_lock_irqsave(&local->queue_stop_reason_lock,
4888					  flags);
4889			if (!txok)
4890				break;
4891		}
4892	}
4893	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4894
4895	rcu_read_unlock();
4896}
4897
4898/* functions for drivers to get certain frames */
4899
4900static void ieee80211_beacon_add_tim_pvb(struct ps_data *ps,
4901					 struct sk_buff *skb,
4902					 bool mcast_traffic)
4903{
4904	int i, n1 = 0, n2;
4905
4906	/*
4907	 * Find largest even number N1 so that bits numbered 1 through
4908	 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4909	 * (N2 + 1) x 8 through 2007 are 0.
4910	 */
4911	for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4912		if (ps->tim[i]) {
4913			n1 = i & 0xfe;
4914			break;
4915		}
4916	}
4917	n2 = n1;
4918	for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4919		if (ps->tim[i]) {
4920			n2 = i;
4921			break;
4922		}
4923	}
4924
4925	/* Bitmap control */
4926	skb_put_u8(skb, n1 | mcast_traffic);
4927	/* Part Virt Bitmap */
4928	skb_put_data(skb, ps->tim + n1, n2 - n1 + 1);
4929}
4930
4931/*
4932 * mac80211 currently supports encoding using block bitmap mode, non
4933 * inversed. The current implementation supports up to 1600 AIDs.
4934 *
4935 * Block bitmap encoding breaks down the AID bitmap into blocks of 64
4936 * AIDs. Each block contains between 0 and 8 subblocks. Each subblock
4937 * describes 8 AIDs and the presence of a subblock is determined by
4938 * the block bitmap.
4939 */
4940static void ieee80211_s1g_beacon_add_tim_pvb(struct ps_data *ps,
4941					     struct sk_buff *skb,
4942					     bool mcast_traffic)
4943{
4944	int blk;
4945
4946	/*
4947	 * Emit a bitmap control block with a page slice number of 31 and a
4948	 * page index of 0 which indicates as per IEEE80211-2024 9.4.2.5.1
4949	 * that the entire page (2048 bits) indicated by the page index
4950	 * is encoded in the partial virtual bitmap.
4951	 */
4952	skb_put_u8(skb, mcast_traffic | (31 << 1));
4953
4954	/* Emit an encoded block for each non-zero sub-block */
4955	for (blk = 0; blk < IEEE80211_MAX_SUPPORTED_S1G_TIM_BLOCKS; blk++) {
4956		u8 blk_bmap = 0;
4957		int sblk;
4958
4959		for (sblk = 0; sblk < 8; sblk++) {
4960			int sblk_idx = blk * 8 + sblk;
4961
4962			/*
4963			 * If the current subblock is non-zero, increase the
4964			 * number of subblocks to emit for the current block.
4965			 */
4966			if (ps->tim[sblk_idx])
4967				blk_bmap |= BIT(sblk);
4968		}
4969
4970		/* If the current block contains no non-zero sublocks */
4971		if (!blk_bmap)
4972			continue;
4973
4974		/*
4975		 * Emit a block control byte for the current encoded block
4976		 * with an encoding mode of block bitmap (0x0), not inverse
4977		 * (0x0) and the current block offset (5 bits)
4978		 */
4979		skb_put_u8(skb, blk << 3);
4980
4981		/*
4982		 * Emit the block bitmap for the current encoded block which
4983		 * contains the present subblocks.
4984		 */
4985		skb_put_u8(skb, blk_bmap);
4986
4987		/* Emit the present subblocks */
4988		for (sblk = 0; sblk < 8; sblk++) {
4989			int sblk_idx = blk * 8 + sblk;
4990
4991			if (!(blk_bmap & BIT(sblk)))
4992				continue;
4993
4994			skb_put_u8(skb, ps->tim[sblk_idx]);
4995		}
4996	}
4997}
4998
4999static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
5000				       struct ieee80211_link_data *link,
5001				       struct ps_data *ps, struct sk_buff *skb,
5002				       bool is_template)
5003{
5004	struct element *tim;
5005	bool mcast_traffic = false, have_bits = false;
5006	struct ieee80211_bss_conf *link_conf = link->conf;
5007	bool s1g = ieee80211_get_link_sband(link)->band == NL80211_BAND_S1GHZ;
5008
5009	/* Generate bitmap for TIM only if there are any STAs in power save
5010	 * mode. */
5011	if (atomic_read(&ps->num_sta_ps) > 0)
5012		/* in the hope that this is faster than
5013		 * checking byte-for-byte */
5014		have_bits = !bitmap_empty((unsigned long *)ps->tim,
5015					  IEEE80211_MAX_AID + 1);
5016
5017	if (!is_template) {
5018		if (ps->dtim_count == 0)
5019			ps->dtim_count = link_conf->dtim_period - 1;
5020		else
5021			ps->dtim_count--;
5022	}
5023
5024	/* Length is set after parsing the AID bitmap */
5025	tim = skb_put(skb, sizeof(struct element));
5026	tim->id = WLAN_EID_TIM;
5027	skb_put_u8(skb, ps->dtim_count);
5028	skb_put_u8(skb, link_conf->dtim_period);
5029
5030	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
5031		mcast_traffic = true;
5032
5033	ps->dtim_bc_mc = mcast_traffic;
5034
5035	if (have_bits) {
5036		if (s1g)
5037			ieee80211_s1g_beacon_add_tim_pvb(ps, skb,
5038							 mcast_traffic);
5039		else
5040			ieee80211_beacon_add_tim_pvb(ps, skb, mcast_traffic);
5041	} else {
5042		/*
5043		 * If there is no buffered unicast traffic for an S1G
5044		 * interface, we can exclude the bitmap control. This is in
5045		 * contrast to other phy types as they do include the bitmap
5046		 * control and pvb even when there is no buffered traffic.
5047		 */
5048		if (!s1g) {
5049			/* Bitmap control */
5050			skb_put_u8(skb, mcast_traffic);
5051			/* Part Virt Bitmap */
5052			skb_put_u8(skb, 0);
5053		}
5054	}
5055
5056	tim->datalen = skb_tail_pointer(skb) - tim->data;
5057}
5058
5059static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
5060				    struct ieee80211_link_data *link,
5061				    struct ps_data *ps, struct sk_buff *skb,
5062				    bool is_template)
5063{
5064	struct ieee80211_local *local = sdata->local;
5065
5066	/*
5067	 * Not very nice, but we want to allow the driver to call
5068	 * ieee80211_beacon_get() as a response to the set_tim()
5069	 * callback. That, however, is already invoked under the
5070	 * sta_lock to guarantee consistent and race-free update
5071	 * of the tim bitmap in mac80211 and the driver.
5072	 */
5073	if (local->tim_in_locked_section) {
5074		__ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template);
5075	} else {
5076		spin_lock_bh(&local->tim_lock);
5077		__ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template);
5078		spin_unlock_bh(&local->tim_lock);
5079	}
5080
5081	return 0;
5082}
5083
5084static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata,
5085					struct beacon_data *beacon,
5086					struct ieee80211_link_data *link)
5087{
5088	u8 *beacon_data, count, max_count = 1;
5089	struct probe_resp *resp;
5090	size_t beacon_data_len;
5091	u16 *bcn_offsets;
5092	int i;
5093
5094	switch (sdata->vif.type) {
5095	case NL80211_IFTYPE_AP:
5096		beacon_data = beacon->tail;
5097		beacon_data_len = beacon->tail_len;
5098		break;
5099	case NL80211_IFTYPE_ADHOC:
5100		beacon_data = beacon->head;
5101		beacon_data_len = beacon->head_len;
5102		break;
5103	case NL80211_IFTYPE_MESH_POINT:
5104		beacon_data = beacon->head;
5105		beacon_data_len = beacon->head_len;
5106		break;
5107	default:
5108		return;
5109	}
5110
5111	resp = rcu_dereference(link->u.ap.probe_resp);
5112
5113	bcn_offsets = beacon->cntdwn_counter_offsets;
5114	count = beacon->cntdwn_current_counter;
5115	if (link->conf->csa_active)
5116		max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM;
5117
5118	for (i = 0; i < max_count; ++i) {
5119		if (bcn_offsets[i]) {
5120			if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len))
5121				return;
5122			beacon_data[bcn_offsets[i]] = count;
5123		}
5124
5125		if (sdata->vif.type == NL80211_IFTYPE_AP && resp) {
5126			u16 *resp_offsets = resp->cntdwn_counter_offsets;
5127
5128			resp->data[resp_offsets[i]] = count;
5129		}
5130	}
5131}
5132
5133static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link,
5134					   struct beacon_data *beacon)
5135{
5136	if (beacon->cntdwn_current_counter == 1) {
5137		/*
5138		 * Channel switch handling is done by a worker thread while
5139		 * beacons get pulled from hardware timers. It's therefore
5140		 * possible that software threads are slow enough to not be
5141		 * able to complete CSA handling in a single beacon interval,
5142		 * in which case we get here. There isn't much to do about
5143		 * it, other than letting the user know that the AP isn't
5144		 * behaving correctly.
5145		 */
5146		link_err_once(link,
5147			      "beacon TX faster than countdown (channel/color switch) completion\n");
5148		return 0;
5149	}
5150
5151	beacon->cntdwn_current_counter--;
5152
5153	return beacon->cntdwn_current_counter;
5154}
5155
5156u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id)
5157{
5158	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5159	struct ieee80211_link_data *link;
5160	struct beacon_data *beacon = NULL;
5161	u8 count = 0;
5162
5163	if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS))
5164		return 0;
5165
5166	rcu_read_lock();
5167
5168	link = rcu_dereference(sdata->link[link_id]);
5169	if (!link)
5170		goto unlock;
5171
5172	if (sdata->vif.type == NL80211_IFTYPE_AP)
5173		beacon = rcu_dereference(link->u.ap.beacon);
5174	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
5175		beacon = rcu_dereference(sdata->u.ibss.presp);
5176	else if (ieee80211_vif_is_mesh(&sdata->vif))
5177		beacon = rcu_dereference(sdata->u.mesh.beacon);
5178
5179	if (!beacon)
5180		goto unlock;
5181
5182	count = __ieee80211_beacon_update_cntdwn(link, beacon);
5183
5184unlock:
5185	rcu_read_unlock();
5186	return count;
5187}
5188EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn);
5189
5190void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter)
5191{
5192	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5193	struct beacon_data *beacon = NULL;
5194
5195	rcu_read_lock();
5196
5197	if (sdata->vif.type == NL80211_IFTYPE_AP)
5198		beacon = rcu_dereference(sdata->deflink.u.ap.beacon);
5199	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
5200		beacon = rcu_dereference(sdata->u.ibss.presp);
5201	else if (ieee80211_vif_is_mesh(&sdata->vif))
5202		beacon = rcu_dereference(sdata->u.mesh.beacon);
5203
5204	if (!beacon)
5205		goto unlock;
5206
5207	if (counter < beacon->cntdwn_current_counter)
5208		beacon->cntdwn_current_counter = counter;
5209
5210unlock:
5211	rcu_read_unlock();
5212}
5213EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn);
5214
5215bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif,
5216					 unsigned int link_id)
5217{
5218	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5219	struct ieee80211_link_data *link;
5220	struct beacon_data *beacon = NULL;
5221	u8 *beacon_data;
5222	size_t beacon_data_len;
5223	int ret = false;
5224
5225	if (!ieee80211_sdata_running(sdata))
5226		return false;
5227
5228	if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS))
5229		return 0;
5230
5231	rcu_read_lock();
5232
5233	link = rcu_dereference(sdata->link[link_id]);
5234	if (!link)
5235		goto out;
5236
5237	if (vif->type == NL80211_IFTYPE_AP) {
5238		beacon = rcu_dereference(link->u.ap.beacon);
5239		if (WARN_ON(!beacon || !beacon->tail))
5240			goto out;
5241		beacon_data = beacon->tail;
5242		beacon_data_len = beacon->tail_len;
5243	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
5244		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
5245
5246		beacon = rcu_dereference(ifibss->presp);
5247		if (!beacon)
5248			goto out;
5249
5250		beacon_data = beacon->head;
5251		beacon_data_len = beacon->head_len;
5252	} else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
5253		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
5254
5255		beacon = rcu_dereference(ifmsh->beacon);
5256		if (!beacon)
5257			goto out;
5258
5259		beacon_data = beacon->head;
5260		beacon_data_len = beacon->head_len;
5261	} else {
5262		WARN_ON(1);
5263		goto out;
5264	}
5265
5266	if (!beacon->cntdwn_counter_offsets[0])
5267		goto out;
5268
5269	if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len))
5270		goto out;
5271
5272	if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1)
5273		ret = true;
5274
5275 out:
5276	rcu_read_unlock();
5277
5278	return ret;
5279}
5280EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete);
5281
5282static int ieee80211_beacon_protect(struct sk_buff *skb,
5283				    struct ieee80211_local *local,
5284				    struct ieee80211_sub_if_data *sdata,
5285				    struct ieee80211_link_data *link)
5286{
5287	ieee80211_tx_result res;
5288	struct ieee80211_tx_data tx;
5289	struct sk_buff *check_skb;
5290
5291	memset(&tx, 0, sizeof(tx));
5292	tx.key = rcu_dereference(link->default_beacon_key);
5293	if (!tx.key)
5294		return 0;
5295
5296	if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) {
5297		tx.key = NULL;
5298		return -EINVAL;
5299	}
5300
5301	if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
5302	    tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
5303		IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf;
5304
5305	tx.local = local;
5306	tx.sdata = sdata;
5307	__skb_queue_head_init(&tx.skbs);
5308	__skb_queue_tail(&tx.skbs, skb);
5309	res = ieee80211_tx_h_encrypt(&tx);
5310	check_skb = __skb_dequeue(&tx.skbs);
5311	/* we may crash after this, but it'd be a bug in crypto */
5312	WARN_ON(check_skb != skb);
5313	if (WARN_ON_ONCE(res != TX_CONTINUE))
5314		return -EINVAL;
5315
5316	return 0;
5317}
5318
5319static void
5320ieee80211_beacon_get_finish(struct ieee80211_hw *hw,
5321			    struct ieee80211_vif *vif,
5322			    struct ieee80211_link_data *link,
5323			    struct ieee80211_mutable_offsets *offs,
5324			    struct beacon_data *beacon,
5325			    struct sk_buff *skb,
5326			    struct ieee80211_chanctx_conf *chanctx_conf,
5327			    u16 csa_off_base)
5328{
5329	struct ieee80211_local *local = hw_to_local(hw);
5330	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5331	struct ieee80211_tx_info *info;
5332	enum nl80211_band band;
5333	struct ieee80211_tx_rate_control txrc;
5334
5335	/* CSA offsets */
5336	if (offs && beacon) {
5337		u16 i;
5338
5339		for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) {
5340			u16 csa_off = beacon->cntdwn_counter_offsets[i];
5341
5342			if (!csa_off)
5343				continue;
5344
5345			offs->cntdwn_counter_offs[i] = csa_off_base + csa_off;
5346		}
5347	}
5348
5349	band = chanctx_conf->def.chan->band;
5350	info = IEEE80211_SKB_CB(skb);
5351	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
5352	info->flags |= IEEE80211_TX_CTL_NO_ACK;
5353	info->band = band;
5354
5355	memset(&txrc, 0, sizeof(txrc));
5356	txrc.hw = hw;
5357	txrc.sband = local->hw.wiphy->bands[band];
5358	txrc.bss_conf = link->conf;
5359	txrc.skb = skb;
5360	txrc.reported_rate.idx = -1;
5361	if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band])
5362		txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band];
5363	else
5364		txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
5365	txrc.bss = true;
5366	rate_control_get_rate(sdata, NULL, &txrc);
5367
5368	info->control.vif = vif;
5369	info->control.flags |= u32_encode_bits(link->link_id,
5370					       IEEE80211_TX_CTRL_MLO_LINK);
5371	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
5372		       IEEE80211_TX_CTL_ASSIGN_SEQ |
5373		       IEEE80211_TX_CTL_FIRST_FRAGMENT;
5374}
5375
5376static void
5377ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon,
5378			    u8 i)
5379{
5380	if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt ||
5381	    i > beacon->mbssid_ies->cnt)
5382		return;
5383
5384	if (i < beacon->mbssid_ies->cnt) {
5385		skb_put_data(skb, beacon->mbssid_ies->elem[i].data,
5386			     beacon->mbssid_ies->elem[i].len);
5387
5388		if (beacon->rnr_ies && beacon->rnr_ies->cnt) {
5389			skb_put_data(skb, beacon->rnr_ies->elem[i].data,
5390				     beacon->rnr_ies->elem[i].len);
5391
5392			for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++)
5393				skb_put_data(skb, beacon->rnr_ies->elem[i].data,
5394					     beacon->rnr_ies->elem[i].len);
5395		}
5396		return;
5397	}
5398
5399	/* i == beacon->mbssid_ies->cnt, include all MBSSID elements */
5400	for (i = 0; i < beacon->mbssid_ies->cnt; i++)
5401		skb_put_data(skb, beacon->mbssid_ies->elem[i].data,
5402			     beacon->mbssid_ies->elem[i].len);
5403}
5404
5405static struct sk_buff *
5406__ieee80211_beacon_get_ap(struct ieee80211_hw *hw,
5407			  struct ieee80211_vif *vif,
5408			  struct ieee80211_link_data *link,
5409			  struct ieee80211_mutable_offsets *offs,
5410			  bool is_template,
5411			  struct beacon_data *beacon,
5412			  struct ieee80211_chanctx_conf *chanctx_conf,
5413			  u8 ema_index)
5414{
5415	struct ieee80211_local *local = hw_to_local(hw);
5416	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5417	struct ieee80211_if_ap *ap = &sdata->u.ap;
5418	struct sk_buff *skb = NULL;
5419	u16 csa_off_base = 0;
5420	int mbssid_len;
5421
5422	if (beacon->cntdwn_counter_offsets[0]) {
5423		if (!is_template)
5424			ieee80211_beacon_update_cntdwn(vif, link->link_id);
5425
5426		ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5427	}
5428
5429	/* headroom, head length,
5430	 * tail length, maximum TIM length and multiple BSSID length
5431	 */
5432	mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies,
5433						     beacon->rnr_ies,
5434						     ema_index);
5435
5436	skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
5437			    beacon->tail_len + 256 +
5438			    local->hw.extra_beacon_tailroom + mbssid_len);
5439	if (!skb)
5440		return NULL;
5441
5442	skb_reserve(skb, local->tx_headroom);
5443	skb_put_data(skb, beacon->head, beacon->head_len);
5444
5445	ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template);
5446
5447	if (offs) {
5448		offs->tim_offset = beacon->head_len;
5449		offs->tim_length = skb->len - beacon->head_len;
5450		offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0];
5451
5452		if (mbssid_len) {
5453			ieee80211_beacon_add_mbssid(skb, beacon, ema_index);
5454			offs->mbssid_off = skb->len - mbssid_len;
5455		}
5456
5457		/* for AP the csa offsets are from tail */
5458		csa_off_base = skb->len;
5459	}
5460
5461	if (beacon->tail)
5462		skb_put_data(skb, beacon->tail, beacon->tail_len);
5463
5464	if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) {
5465		dev_kfree_skb(skb);
5466		return NULL;
5467	}
5468
5469	ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5470				    chanctx_conf, csa_off_base);
5471	return skb;
5472}
5473
5474static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata,
5475					   struct ieee80211_link_data *link)
5476{
5477	struct ps_data *ps = &sdata->u.ap.ps;
5478
5479	if (ps->sb_count == 0)
5480		ps->sb_count = link->conf->s1g_long_beacon_period - 1;
5481	else
5482		ps->sb_count--;
5483
5484	return ps->sb_count == 0;
5485}
5486
5487static struct sk_buff *
5488ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw,
5489			       struct ieee80211_vif *vif,
5490			       struct ieee80211_link_data *link,
5491			       struct ieee80211_chanctx_conf *chanctx_conf,
5492			       struct s1g_short_beacon_data *sb,
5493			       bool is_template)
5494{
5495	struct ieee80211_local *local = hw_to_local(hw);
5496	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5497	struct ieee80211_if_ap *ap = &sdata->u.ap;
5498	struct sk_buff *skb;
5499
5500	skb = dev_alloc_skb(local->tx_headroom + sb->short_head_len +
5501			    sb->short_tail_len + 256 +
5502			    local->hw.extra_beacon_tailroom);
5503	if (!skb)
5504		return NULL;
5505
5506	skb_reserve(skb, local->tx_headroom);
5507	skb_put_data(skb, sb->short_head, sb->short_head_len);
5508
5509	ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template);
5510
5511	if (sb->short_tail)
5512		skb_put_data(skb, sb->short_tail, sb->short_tail_len);
5513
5514	ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb,
5515				    chanctx_conf, 0);
5516	return skb;
5517}
5518
5519static struct sk_buff *
5520ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5521			struct ieee80211_link_data *link,
5522			struct ieee80211_mutable_offsets *offs,
5523			bool is_template, struct beacon_data *beacon,
5524			struct ieee80211_chanctx_conf *chanctx_conf,
5525			u8 ema_index, struct s1g_short_beacon_data *s1g_sb)
5526{
5527	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5528
5529	if (!sdata->vif.cfg.s1g || !s1g_sb ||
5530	    ieee80211_s1g_need_long_beacon(sdata, link))
5531		return __ieee80211_beacon_get_ap(hw, vif, link, offs,
5532						 is_template, beacon,
5533						 chanctx_conf, ema_index);
5534
5535	return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf,
5536					      s1g_sb, is_template);
5537}
5538
5539static struct ieee80211_ema_beacons *
5540ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw,
5541				 struct ieee80211_vif *vif,
5542				 struct ieee80211_link_data *link,
5543				 struct ieee80211_mutable_offsets *offs,
5544				 bool is_template, struct beacon_data *beacon,
5545				 struct ieee80211_chanctx_conf *chanctx_conf)
5546{
5547	struct ieee80211_ema_beacons *ema = NULL;
5548
5549	if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt)
5550		return NULL;
5551
5552	ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt),
5553		      GFP_ATOMIC);
5554	if (!ema)
5555		return NULL;
5556
5557	for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) {
5558		ema->bcn[ema->cnt].skb =
5559			ieee80211_beacon_get_ap(hw, vif, link,
5560						&ema->bcn[ema->cnt].offs,
5561						is_template, beacon,
5562						chanctx_conf, ema->cnt, NULL);
5563		if (!ema->bcn[ema->cnt].skb)
5564			break;
5565	}
5566
5567	if (ema->cnt == beacon->mbssid_ies->cnt)
5568		return ema;
5569
5570	ieee80211_beacon_free_ema_list(ema);
5571	return NULL;
5572}
5573
5574#define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1
5575
5576static struct sk_buff *
5577__ieee80211_beacon_get(struct ieee80211_hw *hw,
5578		       struct ieee80211_vif *vif,
5579		       struct ieee80211_mutable_offsets *offs,
5580		       bool is_template,
5581		       unsigned int link_id,
5582		       int ema_index,
5583		       struct ieee80211_ema_beacons **ema_beacons)
5584{
5585	struct ieee80211_local *local = hw_to_local(hw);
5586	struct beacon_data *beacon = NULL;
5587	struct sk_buff *skb = NULL;
5588	struct ieee80211_sub_if_data *sdata = NULL;
5589	struct ieee80211_chanctx_conf *chanctx_conf;
5590	struct ieee80211_link_data *link;
5591	struct s1g_short_beacon_data *s1g_short_bcn = NULL;
5592
5593	rcu_read_lock();
5594
5595	sdata = vif_to_sdata(vif);
5596	link = rcu_dereference(sdata->link[link_id]);
5597	if (!link)
5598		goto out;
5599	chanctx_conf =
5600		rcu_dereference(link->conf->chanctx_conf);
5601
5602	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
5603		goto out;
5604
5605	if (offs)
5606		memset(offs, 0, sizeof(*offs));
5607
5608	if (sdata->vif.type == NL80211_IFTYPE_AP) {
5609		beacon = rcu_dereference(link->u.ap.beacon);
5610		if (!beacon)
5611			goto out;
5612
5613		if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) {
5614			s1g_short_bcn =
5615				rcu_dereference(link->u.ap.s1g_short_beacon);
5616			if (!s1g_short_bcn)
5617				goto out;
5618		}
5619
5620		if (ema_beacons) {
5621			*ema_beacons =
5622				ieee80211_beacon_get_ap_ema_list(hw, vif, link,
5623								 offs,
5624								 is_template,
5625								 beacon,
5626								 chanctx_conf);
5627		} else {
5628			if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) {
5629				if (ema_index >= beacon->mbssid_ies->cnt)
5630					goto out; /* End of MBSSID elements */
5631
5632				if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS)
5633					ema_index = beacon->mbssid_ies->cnt;
5634			} else {
5635				ema_index = 0;
5636			}
5637
5638			skb = ieee80211_beacon_get_ap(hw, vif, link, offs,
5639						      is_template, beacon,
5640						      chanctx_conf, ema_index,
5641						      s1g_short_bcn);
5642		}
5643	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
5644		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
5645		struct ieee80211_hdr *hdr;
5646
5647		beacon = rcu_dereference(ifibss->presp);
5648		if (!beacon)
5649			goto out;
5650
5651		if (beacon->cntdwn_counter_offsets[0]) {
5652			if (!is_template)
5653				__ieee80211_beacon_update_cntdwn(link, beacon);
5654
5655			ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5656		}
5657
5658		skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
5659				    local->hw.extra_beacon_tailroom);
5660		if (!skb)
5661			goto out;
5662		skb_reserve(skb, local->tx_headroom);
5663		skb_put_data(skb, beacon->head, beacon->head_len);
5664
5665		hdr = (struct ieee80211_hdr *) skb->data;
5666		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
5667						 IEEE80211_STYPE_BEACON);
5668
5669		ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5670					    chanctx_conf, 0);
5671	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
5672		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
5673
5674		beacon = rcu_dereference(ifmsh->beacon);
5675		if (!beacon)
5676			goto out;
5677
5678		if (beacon->cntdwn_counter_offsets[0]) {
5679			if (!is_template)
5680				/* TODO: For mesh csa_counter is in TU, so
5681				 * decrementing it by one isn't correct, but
5682				 * for now we leave it consistent with overall
5683				 * mac80211's behavior.
5684				 */
5685				__ieee80211_beacon_update_cntdwn(link, beacon);
5686
5687			ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5688		}
5689
5690		if (ifmsh->sync_ops)
5691			ifmsh->sync_ops->adjust_tsf(sdata, beacon);
5692
5693		skb = dev_alloc_skb(local->tx_headroom +
5694				    beacon->head_len +
5695				    256 + /* TIM IE */
5696				    beacon->tail_len +
5697				    local->hw.extra_beacon_tailroom);
5698		if (!skb)
5699			goto out;
5700		skb_reserve(skb, local->tx_headroom);
5701		skb_put_data(skb, beacon->head, beacon->head_len);
5702		ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb,
5703					 is_template);
5704
5705		if (offs) {
5706			offs->tim_offset = beacon->head_len;
5707			offs->tim_length = skb->len - beacon->head_len;
5708		}
5709
5710		skb_put_data(skb, beacon->tail, beacon->tail_len);
5711		ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5712					    chanctx_conf, 0);
5713	} else {
5714		WARN_ON(1);
5715		goto out;
5716	}
5717
5718 out:
5719	rcu_read_unlock();
5720	return skb;
5721
5722}
5723
5724struct sk_buff *
5725ieee80211_beacon_get_template(struct ieee80211_hw *hw,
5726			      struct ieee80211_vif *vif,
5727			      struct ieee80211_mutable_offsets *offs,
5728			      unsigned int link_id)
5729{
5730	return __ieee80211_beacon_get(hw, vif, offs, true, link_id,
5731				      IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL);
5732}
5733EXPORT_SYMBOL(ieee80211_beacon_get_template);
5734
5735struct sk_buff *
5736ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw,
5737					struct ieee80211_vif *vif,
5738					struct ieee80211_mutable_offsets *offs,
5739					unsigned int link_id, u8 ema_index)
5740{
5741	return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index,
5742				      NULL);
5743}
5744EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index);
5745
5746void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons)
5747{
5748	u8 i;
5749
5750	if (!ema_beacons)
5751		return;
5752
5753	for (i = 0; i < ema_beacons->cnt; i++)
5754		kfree_skb(ema_beacons->bcn[i].skb);
5755
5756	kfree(ema_beacons);
5757}
5758EXPORT_SYMBOL(ieee80211_beacon_free_ema_list);
5759
5760struct ieee80211_ema_beacons *
5761ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw,
5762				       struct ieee80211_vif *vif,
5763				       unsigned int link_id)
5764{
5765	struct ieee80211_ema_beacons *ema_beacons = NULL;
5766
5767	WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0,
5768				       &ema_beacons));
5769
5770	return ema_beacons;
5771}
5772EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list);
5773
5774struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
5775					 struct ieee80211_vif *vif,
5776					 u16 *tim_offset, u16 *tim_length,
5777					 unsigned int link_id)
5778{
5779	struct ieee80211_mutable_offsets offs = {};
5780	struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false,
5781						     link_id,
5782						     IEEE80211_INCLUDE_ALL_MBSSID_ELEMS,
5783						     NULL);
5784	struct sk_buff *copy;
5785
5786	if (!bcn)
5787		return bcn;
5788
5789	if (tim_offset)
5790		*tim_offset = offs.tim_offset;
5791
5792	if (tim_length)
5793		*tim_length = offs.tim_length;
5794
5795	if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
5796	    !hw_to_local(hw)->monitors)
5797		return bcn;
5798
5799	/* send a copy to monitor interfaces */
5800	copy = skb_copy(bcn, GFP_ATOMIC);
5801	if (!copy)
5802		return bcn;
5803
5804	ieee80211_tx_monitor(hw_to_local(hw), copy, 1, NULL);
5805
5806	return bcn;
5807}
5808EXPORT_SYMBOL(ieee80211_beacon_get_tim);
5809
5810struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
5811					struct ieee80211_vif *vif)
5812{
5813	struct sk_buff *skb = NULL;
5814	struct probe_resp *presp = NULL;
5815	struct ieee80211_hdr *hdr;
5816	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5817
5818	if (sdata->vif.type != NL80211_IFTYPE_AP)
5819		return NULL;
5820
5821	rcu_read_lock();
5822	presp = rcu_dereference(sdata->deflink.u.ap.probe_resp);
5823	if (!presp)
5824		goto out;
5825
5826	skb = dev_alloc_skb(presp->len);
5827	if (!skb)
5828		goto out;
5829
5830	skb_put_data(skb, presp->data, presp->len);
5831
5832	hdr = (struct ieee80211_hdr *) skb->data;
5833	memset(hdr->addr1, 0, sizeof(hdr->addr1));
5834
5835out:
5836	rcu_read_unlock();
5837	return skb;
5838}
5839EXPORT_SYMBOL(ieee80211_proberesp_get);
5840
5841struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw,
5842						  struct ieee80211_vif *vif)
5843{
5844	struct sk_buff *skb = NULL;
5845	struct fils_discovery_data *tmpl = NULL;
5846	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5847
5848	if (sdata->vif.type != NL80211_IFTYPE_AP)
5849		return NULL;
5850
5851	rcu_read_lock();
5852	tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery);
5853	if (!tmpl) {
5854		rcu_read_unlock();
5855		return NULL;
5856	}
5857
5858	skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
5859	if (skb) {
5860		skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
5861		skb_put_data(skb, tmpl->data, tmpl->len);
5862	}
5863
5864	rcu_read_unlock();
5865	return skb;
5866}
5867EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl);
5868
5869struct sk_buff *
5870ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw,
5871					  struct ieee80211_vif *vif)
5872{
5873	struct sk_buff *skb = NULL;
5874	struct unsol_bcast_probe_resp_data *tmpl = NULL;
5875	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5876
5877	if (sdata->vif.type != NL80211_IFTYPE_AP)
5878		return NULL;
5879
5880	rcu_read_lock();
5881	tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp);
5882	if (!tmpl) {
5883		rcu_read_unlock();
5884		return NULL;
5885	}
5886
5887	skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
5888	if (skb) {
5889		skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
5890		skb_put_data(skb, tmpl->data, tmpl->len);
5891	}
5892
5893	rcu_read_unlock();
5894	return skb;
5895}
5896EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl);
5897
5898struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
5899				     struct ieee80211_vif *vif)
5900{
5901	struct ieee80211_sub_if_data *sdata;
5902	struct ieee80211_pspoll *pspoll;
5903	struct ieee80211_local *local;
5904	struct sk_buff *skb;
5905
5906	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
5907		return NULL;
5908
5909	sdata = vif_to_sdata(vif);
5910	local = sdata->local;
5911
5912	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
5913	if (!skb)
5914		return NULL;
5915
5916	skb_reserve(skb, local->hw.extra_tx_headroom);
5917
5918	pspoll = skb_put_zero(skb, sizeof(*pspoll));
5919	pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
5920					    IEEE80211_STYPE_PSPOLL);
5921	pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid);
5922
5923	/* aid in PS-Poll has its two MSBs each set to 1 */
5924	pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
5925
5926	memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
5927	memcpy(pspoll->ta, vif->addr, ETH_ALEN);
5928
5929	return skb;
5930}
5931EXPORT_SYMBOL(ieee80211_pspoll_get);
5932
5933struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
5934				       struct ieee80211_vif *vif,
5935				       int link_id, bool qos_ok)
5936{
5937	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5938	struct ieee80211_local *local = sdata->local;
5939	struct ieee80211_link_data *link = NULL;
5940	struct ieee80211_hdr_3addr *nullfunc;
5941	struct sk_buff *skb;
5942	bool qos = false;
5943
5944	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
5945		return NULL;
5946
5947	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
5948			    sizeof(*nullfunc) + 2);
5949	if (!skb)
5950		return NULL;
5951
5952	rcu_read_lock();
5953	if (qos_ok) {
5954		struct sta_info *sta;
5955
5956		sta = sta_info_get(sdata, vif->cfg.ap_addr);
5957		qos = sta && sta->sta.wme;
5958	}
5959
5960	if (link_id >= 0) {
5961		link = rcu_dereference(sdata->link[link_id]);
5962		if (WARN_ON_ONCE(!link)) {
5963			rcu_read_unlock();
5964			kfree_skb(skb);
5965			return NULL;
5966		}
5967	}
5968
5969	skb_reserve(skb, local->hw.extra_tx_headroom);
5970
5971	nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
5972	nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
5973					      IEEE80211_STYPE_NULLFUNC |
5974					      IEEE80211_FCTL_TODS);
5975	if (qos) {
5976		__le16 qoshdr = cpu_to_le16(7);
5977
5978		BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
5979			      IEEE80211_STYPE_NULLFUNC) !=
5980			     IEEE80211_STYPE_QOS_NULLFUNC);
5981		nullfunc->frame_control |=
5982			cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
5983		skb->priority = 7;
5984		skb_set_queue_mapping(skb, IEEE80211_AC_VO);
5985		skb_put_data(skb, &qoshdr, sizeof(qoshdr));
5986	}
5987
5988	if (link) {
5989		memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN);
5990		memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN);
5991		memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN);
5992	} else {
5993		memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN);
5994		memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
5995		memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN);
5996	}
5997	rcu_read_unlock();
5998
5999	return skb;
6000}
6001EXPORT_SYMBOL(ieee80211_nullfunc_get);
6002
6003struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
6004				       const u8 *src_addr,
6005				       const u8 *ssid, size_t ssid_len,
6006				       size_t tailroom)
6007{
6008	struct ieee80211_local *local = hw_to_local(hw);
6009	struct ieee80211_hdr_3addr *hdr;
6010	struct sk_buff *skb;
6011	size_t ie_ssid_len;
6012	u8 *pos;
6013
6014	ie_ssid_len = 2 + ssid_len;
6015
6016	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
6017			    ie_ssid_len + tailroom);
6018	if (!skb)
6019		return NULL;
6020
6021	skb_reserve(skb, local->hw.extra_tx_headroom);
6022
6023	hdr = skb_put_zero(skb, sizeof(*hdr));
6024	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
6025					 IEEE80211_STYPE_PROBE_REQ);
6026	eth_broadcast_addr(hdr->addr1);
6027	memcpy(hdr->addr2, src_addr, ETH_ALEN);
6028	eth_broadcast_addr(hdr->addr3);
6029
6030	pos = skb_put(skb, ie_ssid_len);
6031	*pos++ = WLAN_EID_SSID;
6032	*pos++ = ssid_len;
6033	if (ssid_len)
6034		memcpy(pos, ssid, ssid_len);
6035	pos += ssid_len;
6036
6037	return skb;
6038}
6039EXPORT_SYMBOL(ieee80211_probereq_get);
6040
6041void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
6042		       const void *frame, size_t frame_len,
6043		       const struct ieee80211_tx_info *frame_txctl,
6044		       struct ieee80211_rts *rts)
6045{
6046	const struct ieee80211_hdr *hdr = frame;
6047
6048	rts->frame_control =
6049	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
6050	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
6051					       frame_txctl);
6052	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
6053	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
6054}
6055EXPORT_SYMBOL(ieee80211_rts_get);
6056
6057void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
6058			     const void *frame, size_t frame_len,
6059			     const struct ieee80211_tx_info *frame_txctl,
6060			     struct ieee80211_cts *cts)
6061{
6062	const struct ieee80211_hdr *hdr = frame;
6063
6064	cts->frame_control =
6065	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
6066	cts->duration = ieee80211_ctstoself_duration(hw, vif,
6067						     frame_len, frame_txctl);
6068	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
6069}
6070EXPORT_SYMBOL(ieee80211_ctstoself_get);
6071
6072struct sk_buff *
6073ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
6074			  struct ieee80211_vif *vif)
6075{
6076	struct ieee80211_local *local = hw_to_local(hw);
6077	struct sk_buff *skb = NULL;
6078	struct ieee80211_tx_data tx;
6079	struct ieee80211_sub_if_data *sdata;
6080	struct ps_data *ps;
6081	struct ieee80211_tx_info *info;
6082	struct ieee80211_chanctx_conf *chanctx_conf;
6083
6084	sdata = vif_to_sdata(vif);
6085
6086	rcu_read_lock();
6087	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
6088
6089	if (!chanctx_conf)
6090		goto out;
6091
6092	if (sdata->vif.type == NL80211_IFTYPE_AP) {
6093		struct beacon_data *beacon =
6094				rcu_dereference(sdata->deflink.u.ap.beacon);
6095
6096		if (!beacon || !beacon->head)
6097			goto out;
6098
6099		ps = &sdata->u.ap.ps;
6100	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
6101		ps = &sdata->u.mesh.ps;
6102	} else {
6103		goto out;
6104	}
6105
6106	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
6107		goto out; /* send buffered bc/mc only after DTIM beacon */
6108
6109	while (1) {
6110		skb = skb_dequeue(&ps->bc_buf);
6111		if (!skb)
6112			goto out;
6113		local->total_ps_buffered--;
6114
6115		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
6116			struct ieee80211_hdr *hdr =
6117				(struct ieee80211_hdr *) skb->data;
6118			/* more buffered multicast/broadcast frames ==> set
6119			 * MoreData flag in IEEE 802.11 header to inform PS
6120			 * STAs */
6121			hdr->frame_control |=
6122				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
6123		}
6124
6125		if (sdata->vif.type == NL80211_IFTYPE_AP)
6126			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
6127		if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
6128			break;
6129		ieee80211_free_txskb(hw, skb);
6130	}
6131
6132	info = IEEE80211_SKB_CB(skb);
6133
6134	tx.flags |= IEEE80211_TX_PS_BUFFERED;
6135	info->band = chanctx_conf->def.chan->band;
6136
6137	if (invoke_tx_handlers(&tx))
6138		skb = NULL;
6139 out:
6140	rcu_read_unlock();
6141
6142	return skb;
6143}
6144EXPORT_SYMBOL(ieee80211_get_buffered_bc);
6145
6146int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
6147{
6148	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
6149	struct ieee80211_sub_if_data *sdata = sta->sdata;
6150	struct ieee80211_local *local = sdata->local;
6151	int ret;
6152	u32 queues;
6153
6154	lockdep_assert_wiphy(local->hw.wiphy);
6155
6156	/* only some cases are supported right now */
6157	switch (sdata->vif.type) {
6158	case NL80211_IFTYPE_STATION:
6159	case NL80211_IFTYPE_AP:
6160	case NL80211_IFTYPE_AP_VLAN:
6161		break;
6162	default:
6163		WARN_ON(1);
6164		return -EINVAL;
6165	}
6166
6167	if (WARN_ON(tid >= IEEE80211_NUM_UPS))
6168		return -EINVAL;
6169
6170	if (sta->reserved_tid == tid) {
6171		ret = 0;
6172		goto out;
6173	}
6174
6175	if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
6176		sdata_err(sdata, "TID reservation already active\n");
6177		ret = -EALREADY;
6178		goto out;
6179	}
6180
6181	ieee80211_stop_vif_queues(sdata->local, sdata,
6182				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
6183
6184	synchronize_net();
6185
6186	/* Tear down BA sessions so we stop aggregating on this TID */
6187	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
6188		set_sta_flag(sta, WLAN_STA_BLOCK_BA);
6189		__ieee80211_stop_tx_ba_session(sta, tid,
6190					       AGG_STOP_LOCAL_REQUEST);
6191	}
6192
6193	queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
6194	__ieee80211_flush_queues(local, sdata, queues, false);
6195
6196	sta->reserved_tid = tid;
6197
6198	ieee80211_wake_vif_queues(local, sdata,
6199				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
6200
6201	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
6202		clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
6203
6204	ret = 0;
6205 out:
6206	return ret;
6207}
6208EXPORT_SYMBOL(ieee80211_reserve_tid);
6209
6210void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
6211{
6212	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
6213	struct ieee80211_sub_if_data *sdata = sta->sdata;
6214
6215	lockdep_assert_wiphy(sdata->local->hw.wiphy);
6216
6217	/* only some cases are supported right now */
6218	switch (sdata->vif.type) {
6219	case NL80211_IFTYPE_STATION:
6220	case NL80211_IFTYPE_AP:
6221	case NL80211_IFTYPE_AP_VLAN:
6222		break;
6223	default:
6224		WARN_ON(1);
6225		return;
6226	}
6227
6228	if (tid != sta->reserved_tid) {
6229		sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
6230		return;
6231	}
6232
6233	sta->reserved_tid = IEEE80211_TID_UNRESERVED;
6234}
6235EXPORT_SYMBOL(ieee80211_unreserve_tid);
6236
6237void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
6238				 struct sk_buff *skb, int tid, int link_id,
6239				 enum nl80211_band band)
6240{
6241	const struct ieee80211_hdr *hdr = (void *)skb->data;
6242	int ac = ieee80211_ac_from_tid(tid);
6243	unsigned int link;
6244
6245	skb_reset_mac_header(skb);
6246	skb_set_queue_mapping(skb, ac);
6247	skb->priority = tid;
6248
6249	skb->dev = sdata->dev;
6250
6251	BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS);
6252	BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK,
6253				IEEE80211_LINK_UNSPECIFIED));
6254
6255	if (!ieee80211_vif_is_mld(&sdata->vif)) {
6256		link = 0;
6257	} else if (link_id >= 0) {
6258		link = link_id;
6259	} else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) {
6260		/* address from the MLD */
6261		link = IEEE80211_LINK_UNSPECIFIED;
6262	} else {
6263		/* otherwise must be addressed from a link */
6264		rcu_read_lock();
6265		for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) {
6266			struct ieee80211_bss_conf *link_conf;
6267
6268			link_conf = rcu_dereference(sdata->vif.link_conf[link]);
6269			if (!link_conf)
6270				continue;
6271			if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0)
6272				break;
6273		}
6274		rcu_read_unlock();
6275
6276		if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf)))
6277			link = ffs(sdata->vif.active_links) - 1;
6278	}
6279
6280	IEEE80211_SKB_CB(skb)->control.flags |=
6281		u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK);
6282
6283	/*
6284	 * The other path calling ieee80211_xmit is from the tasklet,
6285	 * and while we can handle concurrent transmissions locking
6286	 * requirements are that we do not come into tx with bhs on.
6287	 */
6288	local_bh_disable();
6289	IEEE80211_SKB_CB(skb)->band = band;
6290	ieee80211_xmit(sdata, NULL, skb);
6291	local_bh_enable();
6292}
6293
6294void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
6295			  struct sk_buff *skb, int tid, int link_id)
6296{
6297	struct ieee80211_chanctx_conf *chanctx_conf;
6298	enum nl80211_band band;
6299
6300	rcu_read_lock();
6301	if (sdata->vif.type == NL80211_IFTYPE_NAN) {
6302		band = NUM_NL80211_BANDS;
6303	} else if (!ieee80211_vif_is_mld(&sdata->vif)) {
6304		WARN_ON(link_id >= 0);
6305		chanctx_conf =
6306			rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
6307		if (WARN_ON(!chanctx_conf)) {
6308			rcu_read_unlock();
6309			kfree_skb(skb);
6310			return;
6311		}
6312		band = chanctx_conf->def.chan->band;
6313	} else {
6314		WARN_ON(link_id >= 0 &&
6315			!(sdata->vif.active_links & BIT(link_id)));
6316		/* MLD transmissions must not rely on the band */
6317		band = 0;
6318	}
6319
6320	__ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band);
6321	rcu_read_unlock();
6322}
6323
6324int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
6325			      const u8 *buf, size_t len,
6326			      const u8 *dest, __be16 proto, bool unencrypted,
6327			      int link_id, u64 *cookie)
6328{
6329	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
6330	struct ieee80211_local *local = sdata->local;
6331	struct sta_info *sta;
6332	struct sk_buff *skb;
6333	struct ethhdr *ehdr;
6334	u32 ctrl_flags = 0;
6335	u32 flags = 0;
6336	int err;
6337
6338	/* mutex lock is only needed for incrementing the cookie counter */
6339	lockdep_assert_wiphy(local->hw.wiphy);
6340
6341	/* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
6342	 * or Pre-Authentication
6343	 */
6344	if (proto != sdata->control_port_protocol &&
6345	    proto != cpu_to_be16(ETH_P_PREAUTH))
6346		return -EINVAL;
6347
6348	if (proto == sdata->control_port_protocol)
6349		ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO |
6350			      IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
6351
6352	if (unencrypted)
6353		flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
6354
6355	if (cookie)
6356		ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
6357
6358	flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX;
6359
6360	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
6361			    sizeof(struct ethhdr) + len);
6362	if (!skb)
6363		return -ENOMEM;
6364
6365	skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
6366
6367	skb_put_data(skb, buf, len);
6368
6369	ehdr = skb_push(skb, sizeof(struct ethhdr));
6370	memcpy(ehdr->h_dest, dest, ETH_ALEN);
6371
6372	/* we may override the SA for MLO STA later */
6373	if (link_id < 0) {
6374		ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED,
6375					      IEEE80211_TX_CTRL_MLO_LINK);
6376		memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
6377	} else {
6378		struct ieee80211_bss_conf *link_conf;
6379
6380		ctrl_flags |= u32_encode_bits(link_id,
6381					      IEEE80211_TX_CTRL_MLO_LINK);
6382
6383		rcu_read_lock();
6384		link_conf = rcu_dereference(sdata->vif.link_conf[link_id]);
6385		if (!link_conf) {
6386			dev_kfree_skb(skb);
6387			rcu_read_unlock();
6388			return -ENOLINK;
6389		}
6390		memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN);
6391		rcu_read_unlock();
6392	}
6393
6394	ehdr->h_proto = proto;
6395
6396	skb->dev = dev;
6397	skb->protocol = proto;
6398	skb_reset_network_header(skb);
6399	skb_reset_mac_header(skb);
6400
6401	if (local->hw.queues < IEEE80211_NUM_ACS)
6402		goto start_xmit;
6403
6404	/* update QoS header to prioritize control port frames if possible,
6405	 * prioritization also happens for control port frames send over
6406	 * AF_PACKET
6407	 */
6408	rcu_read_lock();
6409	err = ieee80211_lookup_ra_sta(sdata, skb, &sta);
6410	if (err) {
6411		dev_kfree_skb(skb);
6412		rcu_read_unlock();
6413		return err;
6414	}
6415
6416	if (!IS_ERR(sta)) {
6417		u16 queue = ieee80211_select_queue(sdata, sta, skb);
6418
6419		skb_set_queue_mapping(skb, queue);
6420
6421		/*
6422		 * for MLO STA, the SA should be the AP MLD address, but
6423		 * the link ID has been selected already
6424		 */
6425		if (sta && sta->sta.mlo)
6426			memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
6427	}
6428	rcu_read_unlock();
6429
6430start_xmit:
6431	local_bh_disable();
6432	__ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie);
6433	local_bh_enable();
6434
6435	return 0;
6436}
6437
6438int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev,
6439			      const u8 *buf, size_t len)
6440{
6441	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
6442	struct ieee80211_local *local = sdata->local;
6443	struct sk_buff *skb;
6444
6445	skb = dev_alloc_skb(local->hw.extra_tx_headroom + len +
6446			    30 + /* header size */
6447			    18); /* 11s header size */
6448	if (!skb)
6449		return -ENOMEM;
6450
6451	skb_reserve(skb, local->hw.extra_tx_headroom);
6452	skb_put_data(skb, buf, len);
6453
6454	skb->dev = dev;
6455	skb->protocol = htons(ETH_P_802_3);
6456	skb_reset_network_header(skb);
6457	skb_reset_mac_header(skb);
6458
6459	local_bh_disable();
6460	__ieee80211_subif_start_xmit(skb, skb->dev, 0,
6461				     IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP,
6462				     NULL);
6463	local_bh_enable();
6464
6465	return 0;
6466}