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) 2018-2021 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 <linux/timekeeping.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <net/codel.h>
27 #include <net/codel_impl.h>
28 #include <asm/unaligned.h>
29 #include <net/fq_impl.h>
30 
31 #include "ieee80211_i.h"
32 #include "driver-ops.h"
33 #include "led.h"
34 #include "mesh.h"
35 #include "wep.h"
36 #include "wpa.h"
37 #include "wme.h"
38 #include "rate.h"
39 
40 /* misc utils */
41 
ieee80211_duration(struct ieee80211_tx_data * tx,struct sk_buff * skb,int group_addr,int next_frag_len)42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
43 				 struct sk_buff *skb, int group_addr,
44 				 int next_frag_len)
45 {
46 	int rate, mrate, erp, dur, i, shift = 0;
47 	struct ieee80211_rate *txrate;
48 	struct ieee80211_local *local = tx->local;
49 	struct ieee80211_supported_band *sband;
50 	struct ieee80211_hdr *hdr;
51 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
52 	struct ieee80211_chanctx_conf *chanctx_conf;
53 	u32 rate_flags = 0;
54 
55 	/* assume HW handles this */
56 	if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
57 		return 0;
58 
59 	rcu_read_lock();
60 	chanctx_conf = rcu_dereference(tx->sdata->vif.bss_conf.chanctx_conf);
61 	if (chanctx_conf) {
62 		shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
63 		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
64 	}
65 	rcu_read_unlock();
66 
67 	/* uh huh? */
68 	if (WARN_ON_ONCE(tx->rate.idx < 0))
69 		return 0;
70 
71 	sband = local->hw.wiphy->bands[info->band];
72 	txrate = &sband->bitrates[tx->rate.idx];
73 
74 	erp = txrate->flags & IEEE80211_RATE_ERP_G;
75 
76 	/* device is expected to do this */
77 	if (sband->band == NL80211_BAND_S1GHZ)
78 		return 0;
79 
80 	/*
81 	 * data and mgmt (except PS Poll):
82 	 * - during CFP: 32768
83 	 * - during contention period:
84 	 *   if addr1 is group address: 0
85 	 *   if more fragments = 0 and addr1 is individual address: time to
86 	 *      transmit one ACK plus SIFS
87 	 *   if more fragments = 1 and addr1 is individual address: time to
88 	 *      transmit next fragment plus 2 x ACK plus 3 x SIFS
89 	 *
90 	 * IEEE 802.11, 9.6:
91 	 * - control response frame (CTS or ACK) shall be transmitted using the
92 	 *   same rate as the immediately previous frame in the frame exchange
93 	 *   sequence, if this rate belongs to the PHY mandatory rates, or else
94 	 *   at the highest possible rate belonging to the PHY rates in the
95 	 *   BSSBasicRateSet
96 	 */
97 	hdr = (struct ieee80211_hdr *)skb->data;
98 	if (ieee80211_is_ctl(hdr->frame_control)) {
99 		/* TODO: These control frames are not currently sent by
100 		 * mac80211, but should they be implemented, this function
101 		 * needs to be updated to support duration field calculation.
102 		 *
103 		 * RTS: time needed to transmit pending data/mgmt frame plus
104 		 *    one CTS frame plus one ACK frame plus 3 x SIFS
105 		 * CTS: duration of immediately previous RTS minus time
106 		 *    required to transmit CTS and its SIFS
107 		 * ACK: 0 if immediately previous directed data/mgmt had
108 		 *    more=0, with more=1 duration in ACK frame is duration
109 		 *    from previous frame minus time needed to transmit ACK
110 		 *    and its SIFS
111 		 * PS Poll: BIT(15) | BIT(14) | aid
112 		 */
113 		return 0;
114 	}
115 
116 	/* data/mgmt */
117 	if (0 /* FIX: data/mgmt during CFP */)
118 		return cpu_to_le16(32768);
119 
120 	if (group_addr) /* Group address as the destination - no ACK */
121 		return 0;
122 
123 	/* Individual destination address:
124 	 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
125 	 * CTS and ACK frames shall be transmitted using the highest rate in
126 	 * basic rate set that is less than or equal to the rate of the
127 	 * immediately previous frame and that is using the same modulation
128 	 * (CCK or OFDM). If no basic rate set matches with these requirements,
129 	 * the highest mandatory rate of the PHY that is less than or equal to
130 	 * the rate of the previous frame is used.
131 	 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
132 	 */
133 	rate = -1;
134 	/* use lowest available if everything fails */
135 	mrate = sband->bitrates[0].bitrate;
136 	for (i = 0; i < sband->n_bitrates; i++) {
137 		struct ieee80211_rate *r = &sband->bitrates[i];
138 
139 		if (r->bitrate > txrate->bitrate)
140 			break;
141 
142 		if ((rate_flags & r->flags) != rate_flags)
143 			continue;
144 
145 		if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
146 			rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
147 
148 		switch (sband->band) {
149 		case NL80211_BAND_2GHZ:
150 		case NL80211_BAND_LC: {
151 			u32 flag;
152 			if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
153 				flag = IEEE80211_RATE_MANDATORY_G;
154 			else
155 				flag = IEEE80211_RATE_MANDATORY_B;
156 			if (r->flags & flag)
157 				mrate = r->bitrate;
158 			break;
159 		}
160 		case NL80211_BAND_5GHZ:
161 		case NL80211_BAND_6GHZ:
162 			if (r->flags & IEEE80211_RATE_MANDATORY_A)
163 				mrate = r->bitrate;
164 			break;
165 		case NL80211_BAND_S1GHZ:
166 		case NL80211_BAND_60GHZ:
167 			/* TODO, for now fall through */
168 		case NUM_NL80211_BANDS:
169 			WARN_ON(1);
170 			break;
171 		}
172 	}
173 	if (rate == -1) {
174 		/* No matching basic rate found; use highest suitable mandatory
175 		 * PHY rate */
176 		rate = DIV_ROUND_UP(mrate, 1 << shift);
177 	}
178 
179 	/* Don't calculate ACKs for QoS Frames with NoAck Policy set */
180 	if (ieee80211_is_data_qos(hdr->frame_control) &&
181 	    *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
182 		dur = 0;
183 	else
184 		/* Time needed to transmit ACK
185 		 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
186 		 * to closest integer */
187 		dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
188 				tx->sdata->vif.bss_conf.use_short_preamble,
189 				shift);
190 
191 	if (next_frag_len) {
192 		/* Frame is fragmented: duration increases with time needed to
193 		 * transmit next fragment plus ACK and 2 x SIFS. */
194 		dur *= 2; /* ACK + SIFS */
195 		/* next fragment */
196 		dur += ieee80211_frame_duration(sband->band, next_frag_len,
197 				txrate->bitrate, erp,
198 				tx->sdata->vif.bss_conf.use_short_preamble,
199 				shift);
200 	}
201 
202 	return cpu_to_le16(dur);
203 }
204 
205 /* tx handlers */
206 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data * tx)207 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
208 {
209 	struct ieee80211_local *local = tx->local;
210 	struct ieee80211_if_managed *ifmgd;
211 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
212 
213 	/* driver doesn't support power save */
214 	if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
215 		return TX_CONTINUE;
216 
217 	/* hardware does dynamic power save */
218 	if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
219 		return TX_CONTINUE;
220 
221 	/* dynamic power save disabled */
222 	if (local->hw.conf.dynamic_ps_timeout <= 0)
223 		return TX_CONTINUE;
224 
225 	/* we are scanning, don't enable power save */
226 	if (local->scanning)
227 		return TX_CONTINUE;
228 
229 	if (!local->ps_sdata)
230 		return TX_CONTINUE;
231 
232 	/* No point if we're going to suspend */
233 	if (local->quiescing)
234 		return TX_CONTINUE;
235 
236 	/* dynamic ps is supported only in managed mode */
237 	if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
238 		return TX_CONTINUE;
239 
240 	if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK))
241 		return TX_CONTINUE;
242 
243 	ifmgd = &tx->sdata->u.mgd;
244 
245 	/*
246 	 * Don't wakeup from power save if u-apsd is enabled, voip ac has
247 	 * u-apsd enabled and the frame is in voip class. This effectively
248 	 * means that even if all access categories have u-apsd enabled, in
249 	 * practise u-apsd is only used with the voip ac. This is a
250 	 * workaround for the case when received voip class packets do not
251 	 * have correct qos tag for some reason, due the network or the
252 	 * peer application.
253 	 *
254 	 * Note: ifmgd->uapsd_queues access is racy here. If the value is
255 	 * changed via debugfs, user needs to reassociate manually to have
256 	 * everything in sync.
257 	 */
258 	if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
259 	    (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
260 	    skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
261 		return TX_CONTINUE;
262 
263 	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
264 		ieee80211_stop_queues_by_reason(&local->hw,
265 						IEEE80211_MAX_QUEUE_MAP,
266 						IEEE80211_QUEUE_STOP_REASON_PS,
267 						false);
268 		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
269 		ieee80211_queue_work(&local->hw,
270 				     &local->dynamic_ps_disable_work);
271 	}
272 
273 	/* Don't restart the timer if we're not disassociated */
274 	if (!ifmgd->associated)
275 		return TX_CONTINUE;
276 
277 	mod_timer(&local->dynamic_ps_timer, jiffies +
278 		  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
279 
280 	return TX_CONTINUE;
281 }
282 
283 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_check_assoc(struct ieee80211_tx_data * tx)284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
285 {
286 
287 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
288 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
289 	bool assoc = false;
290 
291 	if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
292 		return TX_CONTINUE;
293 
294 	if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
295 	    test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
296 	    !ieee80211_is_probe_req(hdr->frame_control) &&
297 	    !ieee80211_is_any_nullfunc(hdr->frame_control))
298 		/*
299 		 * When software scanning only nullfunc frames (to notify
300 		 * the sleep state to the AP) and probe requests (for the
301 		 * active scan) are allowed, all other frames should not be
302 		 * sent and we should not get here, but if we do
303 		 * nonetheless, drop them to avoid sending them
304 		 * off-channel. See the link below and
305 		 * ieee80211_start_scan() for more.
306 		 *
307 		 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
308 		 */
309 		return TX_DROP;
310 
311 	if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
312 		return TX_CONTINUE;
313 
314 	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
315 		return TX_CONTINUE;
316 
317 	if (tx->sta)
318 		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
319 
320 	if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
321 		if (unlikely(!assoc &&
322 			     ieee80211_is_data(hdr->frame_control))) {
323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
324 			sdata_info(tx->sdata,
325 				   "dropped data frame to not associated station %pM\n",
326 				   hdr->addr1);
327 #endif
328 			I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
329 			return TX_DROP;
330 		}
331 	} else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
332 			    ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
333 		/*
334 		 * No associated STAs - no need to send multicast
335 		 * frames.
336 		 */
337 		return TX_DROP;
338 	}
339 
340 	return TX_CONTINUE;
341 }
342 
343 /* This function is called whenever the AP is about to exceed the maximum limit
344  * of buffered frames for power saving STAs. This situation should not really
345  * happen often during normal operation, so dropping the oldest buffered packet
346  * from each queue should be OK to make some room for new frames. */
purge_old_ps_buffers(struct ieee80211_local * local)347 static void purge_old_ps_buffers(struct ieee80211_local *local)
348 {
349 	int total = 0, purged = 0;
350 	struct sk_buff *skb;
351 	struct ieee80211_sub_if_data *sdata;
352 	struct sta_info *sta;
353 
354 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
355 		struct ps_data *ps;
356 
357 		if (sdata->vif.type == NL80211_IFTYPE_AP)
358 			ps = &sdata->u.ap.ps;
359 		else if (ieee80211_vif_is_mesh(&sdata->vif))
360 			ps = &sdata->u.mesh.ps;
361 		else
362 			continue;
363 
364 		skb = skb_dequeue(&ps->bc_buf);
365 		if (skb) {
366 			purged++;
367 			ieee80211_free_txskb(&local->hw, skb);
368 		}
369 		total += skb_queue_len(&ps->bc_buf);
370 	}
371 
372 	/*
373 	 * Drop one frame from each station from the lowest-priority
374 	 * AC that has frames at all.
375 	 */
376 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
377 		int ac;
378 
379 		for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
380 			skb = skb_dequeue(&sta->ps_tx_buf[ac]);
381 			total += skb_queue_len(&sta->ps_tx_buf[ac]);
382 			if (skb) {
383 				purged++;
384 				ieee80211_free_txskb(&local->hw, skb);
385 				break;
386 			}
387 		}
388 	}
389 
390 	local->total_ps_buffered = total;
391 	ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
392 }
393 
394 static ieee80211_tx_result
ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data * tx)395 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
396 {
397 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
398 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
399 	struct ps_data *ps;
400 
401 	/*
402 	 * broadcast/multicast frame
403 	 *
404 	 * If any of the associated/peer stations is in power save mode,
405 	 * the frame is buffered to be sent after DTIM beacon frame.
406 	 * This is done either by the hardware or us.
407 	 */
408 
409 	/* powersaving STAs currently only in AP/VLAN/mesh mode */
410 	if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
411 	    tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
412 		if (!tx->sdata->bss)
413 			return TX_CONTINUE;
414 
415 		ps = &tx->sdata->bss->ps;
416 	} else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
417 		ps = &tx->sdata->u.mesh.ps;
418 	} else {
419 		return TX_CONTINUE;
420 	}
421 
422 
423 	/* no buffering for ordered frames */
424 	if (ieee80211_has_order(hdr->frame_control))
425 		return TX_CONTINUE;
426 
427 	if (ieee80211_is_probe_req(hdr->frame_control))
428 		return TX_CONTINUE;
429 
430 	if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
431 		info->hw_queue = tx->sdata->vif.cab_queue;
432 
433 	/* no stations in PS mode and no buffered packets */
434 	if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
435 		return TX_CONTINUE;
436 
437 	info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
438 
439 	/* device releases frame after DTIM beacon */
440 	if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
441 		return TX_CONTINUE;
442 
443 	/* buffered in mac80211 */
444 	if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
445 		purge_old_ps_buffers(tx->local);
446 
447 	if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
448 		ps_dbg(tx->sdata,
449 		       "BC TX buffer full - dropping the oldest frame\n");
450 		ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
451 	} else
452 		tx->local->total_ps_buffered++;
453 
454 	skb_queue_tail(&ps->bc_buf, tx->skb);
455 
456 	return TX_QUEUED;
457 }
458 
ieee80211_use_mfp(__le16 fc,struct sta_info * sta,struct sk_buff * skb)459 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
460 			     struct sk_buff *skb)
461 {
462 	if (!ieee80211_is_mgmt(fc))
463 		return 0;
464 
465 	if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
466 		return 0;
467 
468 	if (!ieee80211_is_robust_mgmt_frame(skb))
469 		return 0;
470 
471 	return 1;
472 }
473 
474 static ieee80211_tx_result
ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data * tx)475 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
476 {
477 	struct sta_info *sta = tx->sta;
478 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
479 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
480 	struct ieee80211_local *local = tx->local;
481 
482 	if (unlikely(!sta))
483 		return TX_CONTINUE;
484 
485 	if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
486 		      test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
487 		      test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
488 		     !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
489 		int ac = skb_get_queue_mapping(tx->skb);
490 
491 		if (ieee80211_is_mgmt(hdr->frame_control) &&
492 		    !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
493 			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
494 			return TX_CONTINUE;
495 		}
496 
497 		ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
498 		       sta->sta.addr, sta->sta.aid, ac);
499 		if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
500 			purge_old_ps_buffers(tx->local);
501 
502 		/* sync with ieee80211_sta_ps_deliver_wakeup */
503 		spin_lock(&sta->ps_lock);
504 		/*
505 		 * STA woke up the meantime and all the frames on ps_tx_buf have
506 		 * been queued to pending queue. No reordering can happen, go
507 		 * ahead and Tx the packet.
508 		 */
509 		if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
510 		    !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
511 		    !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
512 			spin_unlock(&sta->ps_lock);
513 			return TX_CONTINUE;
514 		}
515 
516 		if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
517 			struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
518 			ps_dbg(tx->sdata,
519 			       "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
520 			       sta->sta.addr, ac);
521 			ieee80211_free_txskb(&local->hw, old);
522 		} else
523 			tx->local->total_ps_buffered++;
524 
525 		info->control.jiffies = jiffies;
526 		info->control.vif = &tx->sdata->vif;
527 		info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
528 		info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
529 		skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
530 		spin_unlock(&sta->ps_lock);
531 
532 		if (!timer_pending(&local->sta_cleanup))
533 			mod_timer(&local->sta_cleanup,
534 				  round_jiffies(jiffies +
535 						STA_INFO_CLEANUP_INTERVAL));
536 
537 		/*
538 		 * We queued up some frames, so the TIM bit might
539 		 * need to be set, recalculate it.
540 		 */
541 		sta_info_recalc_tim(sta);
542 
543 		return TX_QUEUED;
544 	} else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
545 		ps_dbg(tx->sdata,
546 		       "STA %pM in PS mode, but polling/in SP -> send frame\n",
547 		       sta->sta.addr);
548 	}
549 
550 	return TX_CONTINUE;
551 }
552 
553 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_ps_buf(struct ieee80211_tx_data * tx)554 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
555 {
556 	if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
557 		return TX_CONTINUE;
558 
559 	if (tx->flags & IEEE80211_TX_UNICAST)
560 		return ieee80211_tx_h_unicast_ps_buf(tx);
561 	else
562 		return ieee80211_tx_h_multicast_ps_buf(tx);
563 }
564 
565 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data * tx)566 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
567 {
568 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
569 
570 	if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
571 		if (tx->sdata->control_port_no_encrypt)
572 			info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
573 		info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
574 		info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
575 	}
576 
577 	return TX_CONTINUE;
578 }
579 
580 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_select_key(struct ieee80211_tx_data * tx)581 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
582 {
583 	struct ieee80211_key *key;
584 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
585 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
586 
587 	if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) {
588 		tx->key = NULL;
589 		return TX_CONTINUE;
590 	}
591 
592 	if (tx->sta &&
593 	    (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
594 		tx->key = key;
595 	else if (ieee80211_is_group_privacy_action(tx->skb) &&
596 		(key = rcu_dereference(tx->sdata->default_multicast_key)))
597 		tx->key = key;
598 	else if (ieee80211_is_mgmt(hdr->frame_control) &&
599 		 is_multicast_ether_addr(hdr->addr1) &&
600 		 ieee80211_is_robust_mgmt_frame(tx->skb) &&
601 		 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
602 		tx->key = key;
603 	else if (is_multicast_ether_addr(hdr->addr1) &&
604 		 (key = rcu_dereference(tx->sdata->default_multicast_key)))
605 		tx->key = key;
606 	else if (!is_multicast_ether_addr(hdr->addr1) &&
607 		 (key = rcu_dereference(tx->sdata->default_unicast_key)))
608 		tx->key = key;
609 	else
610 		tx->key = NULL;
611 
612 	if (tx->key) {
613 		bool skip_hw = false;
614 
615 		/* TODO: add threshold stuff again */
616 
617 		switch (tx->key->conf.cipher) {
618 		case WLAN_CIPHER_SUITE_WEP40:
619 		case WLAN_CIPHER_SUITE_WEP104:
620 		case WLAN_CIPHER_SUITE_TKIP:
621 			if (!ieee80211_is_data_present(hdr->frame_control))
622 				tx->key = NULL;
623 			break;
624 		case WLAN_CIPHER_SUITE_CCMP:
625 		case WLAN_CIPHER_SUITE_CCMP_256:
626 		case WLAN_CIPHER_SUITE_GCMP:
627 		case WLAN_CIPHER_SUITE_GCMP_256:
628 			if (!ieee80211_is_data_present(hdr->frame_control) &&
629 			    !ieee80211_use_mfp(hdr->frame_control, tx->sta,
630 					       tx->skb) &&
631 			    !ieee80211_is_group_privacy_action(tx->skb))
632 				tx->key = NULL;
633 			else
634 				skip_hw = (tx->key->conf.flags &
635 					   IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
636 					ieee80211_is_mgmt(hdr->frame_control);
637 			break;
638 		case WLAN_CIPHER_SUITE_AES_CMAC:
639 		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
640 		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
641 		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
642 			if (!ieee80211_is_mgmt(hdr->frame_control))
643 				tx->key = NULL;
644 			break;
645 		}
646 
647 		if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
648 			     !ieee80211_is_deauth(hdr->frame_control)))
649 			return TX_DROP;
650 
651 		if (!skip_hw && tx->key &&
652 		    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
653 			info->control.hw_key = &tx->key->conf;
654 	} else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta &&
655 		   test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) {
656 		return TX_DROP;
657 	}
658 
659 	return TX_CONTINUE;
660 }
661 
662 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data * tx)663 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
664 {
665 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
666 	struct ieee80211_hdr *hdr = (void *)tx->skb->data;
667 	struct ieee80211_supported_band *sband;
668 	u32 len;
669 	struct ieee80211_tx_rate_control txrc;
670 	struct ieee80211_sta_rates *ratetbl = NULL;
671 	bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP;
672 	bool assoc = false;
673 
674 	memset(&txrc, 0, sizeof(txrc));
675 
676 	sband = tx->local->hw.wiphy->bands[info->band];
677 
678 	len = min_t(u32, tx->skb->len + FCS_LEN,
679 			 tx->local->hw.wiphy->frag_threshold);
680 
681 	/* set up the tx rate control struct we give the RC algo */
682 	txrc.hw = &tx->local->hw;
683 	txrc.sband = sband;
684 	txrc.bss_conf = &tx->sdata->vif.bss_conf;
685 	txrc.skb = tx->skb;
686 	txrc.reported_rate.idx = -1;
687 	txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
688 
689 	if (tx->sdata->rc_has_mcs_mask[info->band])
690 		txrc.rate_idx_mcs_mask =
691 			tx->sdata->rc_rateidx_mcs_mask[info->band];
692 
693 	txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
694 		    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
695 		    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
696 		    tx->sdata->vif.type == NL80211_IFTYPE_OCB);
697 
698 	/* set up RTS protection if desired */
699 	if (len > tx->local->hw.wiphy->rts_threshold) {
700 		txrc.rts = true;
701 	}
702 
703 	info->control.use_rts = txrc.rts;
704 	info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
705 
706 	/*
707 	 * Use short preamble if the BSS can handle it, but not for
708 	 * management frames unless we know the receiver can handle
709 	 * that -- the management frame might be to a station that
710 	 * just wants a probe response.
711 	 */
712 	if (tx->sdata->vif.bss_conf.use_short_preamble &&
713 	    (ieee80211_is_tx_data(tx->skb) ||
714 	     (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
715 		txrc.short_preamble = true;
716 
717 	info->control.short_preamble = txrc.short_preamble;
718 
719 	/* don't ask rate control when rate already injected via radiotap */
720 	if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
721 		return TX_CONTINUE;
722 
723 	if (tx->sta)
724 		assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
725 
726 	/*
727 	 * Lets not bother rate control if we're associated and cannot
728 	 * talk to the sta. This should not happen.
729 	 */
730 	if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
731 		 !rate_usable_index_exists(sband, &tx->sta->sta),
732 		 "%s: Dropped data frame as no usable bitrate found while "
733 		 "scanning and associated. Target station: "
734 		 "%pM on %d GHz band\n",
735 		 tx->sdata->name,
736 		 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1,
737 		 info->band ? 5 : 2))
738 		return TX_DROP;
739 
740 	/*
741 	 * If we're associated with the sta at this point we know we can at
742 	 * least send the frame at the lowest bit rate.
743 	 */
744 	rate_control_get_rate(tx->sdata, tx->sta, &txrc);
745 
746 	if (tx->sta && !info->control.skip_table)
747 		ratetbl = rcu_dereference(tx->sta->sta.rates);
748 
749 	if (unlikely(info->control.rates[0].idx < 0)) {
750 		if (ratetbl) {
751 			struct ieee80211_tx_rate rate = {
752 				.idx = ratetbl->rate[0].idx,
753 				.flags = ratetbl->rate[0].flags,
754 				.count = ratetbl->rate[0].count
755 			};
756 
757 			if (ratetbl->rate[0].idx < 0)
758 				return TX_DROP;
759 
760 			tx->rate = rate;
761 		} else {
762 			return TX_DROP;
763 		}
764 	} else {
765 		tx->rate = info->control.rates[0];
766 	}
767 
768 	if (txrc.reported_rate.idx < 0) {
769 		txrc.reported_rate = tx->rate;
770 		if (tx->sta && ieee80211_is_tx_data(tx->skb))
771 			tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
772 	} else if (tx->sta)
773 		tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
774 
775 	if (ratetbl)
776 		return TX_CONTINUE;
777 
778 	if (unlikely(!info->control.rates[0].count))
779 		info->control.rates[0].count = 1;
780 
781 	if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
782 			 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
783 		info->control.rates[0].count = 1;
784 
785 	return TX_CONTINUE;
786 }
787 
ieee80211_tx_next_seq(struct sta_info * sta,int tid)788 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
789 {
790 	u16 *seq = &sta->tid_seq[tid];
791 	__le16 ret = cpu_to_le16(*seq);
792 
793 	/* Increase the sequence number. */
794 	*seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
795 
796 	return ret;
797 }
798 
799 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_sequence(struct ieee80211_tx_data * tx)800 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
801 {
802 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
803 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
804 	int tid;
805 
806 	/*
807 	 * Packet injection may want to control the sequence
808 	 * number, if we have no matching interface then we
809 	 * neither assign one ourselves nor ask the driver to.
810 	 */
811 	if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
812 		return TX_CONTINUE;
813 
814 	if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
815 		return TX_CONTINUE;
816 
817 	if (ieee80211_hdrlen(hdr->frame_control) < 24)
818 		return TX_CONTINUE;
819 
820 	if (ieee80211_is_qos_nullfunc(hdr->frame_control))
821 		return TX_CONTINUE;
822 
823 	if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO)
824 		return TX_CONTINUE;
825 
826 	/*
827 	 * Anything but QoS data that has a sequence number field
828 	 * (is long enough) gets a sequence number from the global
829 	 * counter.  QoS data frames with a multicast destination
830 	 * also use the global counter (802.11-2012 9.3.2.10).
831 	 */
832 	if (!ieee80211_is_data_qos(hdr->frame_control) ||
833 	    is_multicast_ether_addr(hdr->addr1)) {
834 		/* driver should assign sequence number */
835 		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
836 		/* for pure STA mode without beacons, we can do it */
837 		hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
838 		tx->sdata->sequence_number += 0x10;
839 		if (tx->sta)
840 			tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++;
841 		return TX_CONTINUE;
842 	}
843 
844 	/*
845 	 * This should be true for injected/management frames only, for
846 	 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
847 	 * above since they are not QoS-data frames.
848 	 */
849 	if (!tx->sta)
850 		return TX_CONTINUE;
851 
852 	/* include per-STA, per-TID sequence counter */
853 	tid = ieee80211_get_tid(hdr);
854 	tx->sta->deflink.tx_stats.msdu[tid]++;
855 
856 	hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
857 
858 	return TX_CONTINUE;
859 }
860 
ieee80211_fragment(struct ieee80211_tx_data * tx,struct sk_buff * skb,int hdrlen,int frag_threshold)861 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
862 			      struct sk_buff *skb, int hdrlen,
863 			      int frag_threshold)
864 {
865 	struct ieee80211_local *local = tx->local;
866 	struct ieee80211_tx_info *info;
867 	struct sk_buff *tmp;
868 	int per_fragm = frag_threshold - hdrlen - FCS_LEN;
869 	int pos = hdrlen + per_fragm;
870 	int rem = skb->len - hdrlen - per_fragm;
871 
872 	if (WARN_ON(rem < 0))
873 		return -EINVAL;
874 
875 	/* first fragment was already added to queue by caller */
876 
877 	while (rem) {
878 		int fraglen = per_fragm;
879 
880 		if (fraglen > rem)
881 			fraglen = rem;
882 		rem -= fraglen;
883 		tmp = dev_alloc_skb(local->tx_headroom +
884 				    frag_threshold +
885 				    tx->sdata->encrypt_headroom +
886 				    IEEE80211_ENCRYPT_TAILROOM);
887 		if (!tmp)
888 			return -ENOMEM;
889 
890 		__skb_queue_tail(&tx->skbs, tmp);
891 
892 		skb_reserve(tmp,
893 			    local->tx_headroom + tx->sdata->encrypt_headroom);
894 
895 		/* copy control information */
896 		memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
897 
898 		info = IEEE80211_SKB_CB(tmp);
899 		info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
900 				 IEEE80211_TX_CTL_FIRST_FRAGMENT);
901 
902 		if (rem)
903 			info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
904 
905 		skb_copy_queue_mapping(tmp, skb);
906 		tmp->priority = skb->priority;
907 		tmp->dev = skb->dev;
908 
909 		/* copy header and data */
910 		skb_put_data(tmp, skb->data, hdrlen);
911 		skb_put_data(tmp, skb->data + pos, fraglen);
912 
913 		pos += fraglen;
914 	}
915 
916 	/* adjust first fragment's length */
917 	skb_trim(skb, hdrlen + per_fragm);
918 	return 0;
919 }
920 
921 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_fragment(struct ieee80211_tx_data * tx)922 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
923 {
924 	struct sk_buff *skb = tx->skb;
925 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
926 	struct ieee80211_hdr *hdr = (void *)skb->data;
927 	int frag_threshold = tx->local->hw.wiphy->frag_threshold;
928 	int hdrlen;
929 	int fragnum;
930 
931 	/* no matter what happens, tx->skb moves to tx->skbs */
932 	__skb_queue_tail(&tx->skbs, skb);
933 	tx->skb = NULL;
934 
935 	if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
936 		return TX_CONTINUE;
937 
938 	if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
939 		return TX_CONTINUE;
940 
941 	/*
942 	 * Warn when submitting a fragmented A-MPDU frame and drop it.
943 	 * This scenario is handled in ieee80211_tx_prepare but extra
944 	 * caution taken here as fragmented ampdu may cause Tx stop.
945 	 */
946 	if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
947 		return TX_DROP;
948 
949 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
950 
951 	/* internal error, why isn't DONTFRAG set? */
952 	if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
953 		return TX_DROP;
954 
955 	/*
956 	 * Now fragment the frame. This will allocate all the fragments and
957 	 * chain them (using skb as the first fragment) to skb->next.
958 	 * During transmission, we will remove the successfully transmitted
959 	 * fragments from this list. When the low-level driver rejects one
960 	 * of the fragments then we will simply pretend to accept the skb
961 	 * but store it away as pending.
962 	 */
963 	if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
964 		return TX_DROP;
965 
966 	/* update duration/seq/flags of fragments */
967 	fragnum = 0;
968 
969 	skb_queue_walk(&tx->skbs, skb) {
970 		const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
971 
972 		hdr = (void *)skb->data;
973 		info = IEEE80211_SKB_CB(skb);
974 
975 		if (!skb_queue_is_last(&tx->skbs, skb)) {
976 			hdr->frame_control |= morefrags;
977 			/*
978 			 * No multi-rate retries for fragmented frames, that
979 			 * would completely throw off the NAV at other STAs.
980 			 */
981 			info->control.rates[1].idx = -1;
982 			info->control.rates[2].idx = -1;
983 			info->control.rates[3].idx = -1;
984 			BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
985 			info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
986 		} else {
987 			hdr->frame_control &= ~morefrags;
988 		}
989 		hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
990 		fragnum++;
991 	}
992 
993 	return TX_CONTINUE;
994 }
995 
996 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data * tx)997 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
998 {
999 	struct sk_buff *skb;
1000 	int ac = -1;
1001 
1002 	if (!tx->sta)
1003 		return TX_CONTINUE;
1004 
1005 	skb_queue_walk(&tx->skbs, skb) {
1006 		ac = skb_get_queue_mapping(skb);
1007 		tx->sta->deflink.tx_stats.bytes[ac] += skb->len;
1008 	}
1009 	if (ac >= 0)
1010 		tx->sta->deflink.tx_stats.packets[ac]++;
1011 
1012 	return TX_CONTINUE;
1013 }
1014 
1015 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_encrypt(struct ieee80211_tx_data * tx)1016 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1017 {
1018 	if (!tx->key)
1019 		return TX_CONTINUE;
1020 
1021 	switch (tx->key->conf.cipher) {
1022 	case WLAN_CIPHER_SUITE_WEP40:
1023 	case WLAN_CIPHER_SUITE_WEP104:
1024 		return ieee80211_crypto_wep_encrypt(tx);
1025 	case WLAN_CIPHER_SUITE_TKIP:
1026 		return ieee80211_crypto_tkip_encrypt(tx);
1027 	case WLAN_CIPHER_SUITE_CCMP:
1028 		return ieee80211_crypto_ccmp_encrypt(
1029 			tx, IEEE80211_CCMP_MIC_LEN);
1030 	case WLAN_CIPHER_SUITE_CCMP_256:
1031 		return ieee80211_crypto_ccmp_encrypt(
1032 			tx, IEEE80211_CCMP_256_MIC_LEN);
1033 	case WLAN_CIPHER_SUITE_AES_CMAC:
1034 		return ieee80211_crypto_aes_cmac_encrypt(tx);
1035 	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1036 		return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1037 	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1038 	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1039 		return ieee80211_crypto_aes_gmac_encrypt(tx);
1040 	case WLAN_CIPHER_SUITE_GCMP:
1041 	case WLAN_CIPHER_SUITE_GCMP_256:
1042 		return ieee80211_crypto_gcmp_encrypt(tx);
1043 	default:
1044 		return ieee80211_crypto_hw_encrypt(tx);
1045 	}
1046 
1047 	return TX_DROP;
1048 }
1049 
1050 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data * tx)1051 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1052 {
1053 	struct sk_buff *skb;
1054 	struct ieee80211_hdr *hdr;
1055 	int next_len;
1056 	bool group_addr;
1057 
1058 	skb_queue_walk(&tx->skbs, skb) {
1059 		hdr = (void *) skb->data;
1060 		if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1061 			break; /* must not overwrite AID */
1062 		if (!skb_queue_is_last(&tx->skbs, skb)) {
1063 			struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1064 			next_len = next->len;
1065 		} else
1066 			next_len = 0;
1067 		group_addr = is_multicast_ether_addr(hdr->addr1);
1068 
1069 		hdr->duration_id =
1070 			ieee80211_duration(tx, skb, group_addr, next_len);
1071 	}
1072 
1073 	return TX_CONTINUE;
1074 }
1075 
1076 /* actual transmit path */
1077 
ieee80211_tx_prep_agg(struct ieee80211_tx_data * tx,struct sk_buff * skb,struct ieee80211_tx_info * info,struct tid_ampdu_tx * tid_tx,int tid)1078 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1079 				  struct sk_buff *skb,
1080 				  struct ieee80211_tx_info *info,
1081 				  struct tid_ampdu_tx *tid_tx,
1082 				  int tid)
1083 {
1084 	bool queued = false;
1085 	bool reset_agg_timer = false;
1086 	struct sk_buff *purge_skb = NULL;
1087 
1088 	if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1089 		info->flags |= IEEE80211_TX_CTL_AMPDU;
1090 		reset_agg_timer = true;
1091 	} else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1092 		/*
1093 		 * nothing -- this aggregation session is being started
1094 		 * but that might still fail with the driver
1095 		 */
1096 	} else if (!tx->sta->sta.txq[tid]) {
1097 		spin_lock(&tx->sta->lock);
1098 		/*
1099 		 * Need to re-check now, because we may get here
1100 		 *
1101 		 *  1) in the window during which the setup is actually
1102 		 *     already done, but not marked yet because not all
1103 		 *     packets are spliced over to the driver pending
1104 		 *     queue yet -- if this happened we acquire the lock
1105 		 *     either before or after the splice happens, but
1106 		 *     need to recheck which of these cases happened.
1107 		 *
1108 		 *  2) during session teardown, if the OPERATIONAL bit
1109 		 *     was cleared due to the teardown but the pointer
1110 		 *     hasn't been assigned NULL yet (or we loaded it
1111 		 *     before it was assigned) -- in this case it may
1112 		 *     now be NULL which means we should just let the
1113 		 *     packet pass through because splicing the frames
1114 		 *     back is already done.
1115 		 */
1116 		tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1117 
1118 		if (!tid_tx) {
1119 			/* do nothing, let packet pass through */
1120 		} else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1121 			info->flags |= IEEE80211_TX_CTL_AMPDU;
1122 			reset_agg_timer = true;
1123 		} else {
1124 			queued = true;
1125 			if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1126 				clear_sta_flag(tx->sta, WLAN_STA_SP);
1127 				ps_dbg(tx->sta->sdata,
1128 				       "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1129 				       tx->sta->sta.addr, tx->sta->sta.aid);
1130 			}
1131 			info->control.vif = &tx->sdata->vif;
1132 			info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1133 			info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1134 			__skb_queue_tail(&tid_tx->pending, skb);
1135 			if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1136 				purge_skb = __skb_dequeue(&tid_tx->pending);
1137 		}
1138 		spin_unlock(&tx->sta->lock);
1139 
1140 		if (purge_skb)
1141 			ieee80211_free_txskb(&tx->local->hw, purge_skb);
1142 	}
1143 
1144 	/* reset session timer */
1145 	if (reset_agg_timer)
1146 		tid_tx->last_tx = jiffies;
1147 
1148 	return queued;
1149 }
1150 
1151 static void
ieee80211_aggr_check(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)1152 ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata,
1153 		     struct sta_info *sta,
1154 		     struct sk_buff *skb)
1155 {
1156 	struct rate_control_ref *ref = sdata->local->rate_ctrl;
1157 	u16 tid;
1158 
1159 	if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER))
1160 		return;
1161 
1162 	if (!sta || !sta->sta.deflink.ht_cap.ht_supported ||
1163 	    !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO ||
1164 	    skb->protocol == sdata->control_port_protocol)
1165 		return;
1166 
1167 	tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1168 	if (likely(sta->ampdu_mlme.tid_tx[tid]))
1169 		return;
1170 
1171 	ieee80211_start_tx_ba_session(&sta->sta, tid, 0);
1172 }
1173 
1174 /*
1175  * initialises @tx
1176  * pass %NULL for the station if unknown, a valid pointer if known
1177  * or an ERR_PTR() if the station is known not to exist
1178  */
1179 static ieee80211_tx_result
ieee80211_tx_prepare(struct ieee80211_sub_if_data * sdata,struct ieee80211_tx_data * tx,struct sta_info * sta,struct sk_buff * skb)1180 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1181 		     struct ieee80211_tx_data *tx,
1182 		     struct sta_info *sta, struct sk_buff *skb)
1183 {
1184 	struct ieee80211_local *local = sdata->local;
1185 	struct ieee80211_hdr *hdr;
1186 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1187 	bool aggr_check = false;
1188 	int tid;
1189 
1190 	memset(tx, 0, sizeof(*tx));
1191 	tx->skb = skb;
1192 	tx->local = local;
1193 	tx->sdata = sdata;
1194 	__skb_queue_head_init(&tx->skbs);
1195 
1196 	/*
1197 	 * If this flag is set to true anywhere, and we get here,
1198 	 * we are doing the needed processing, so remove the flag
1199 	 * now.
1200 	 */
1201 	info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1202 
1203 	hdr = (struct ieee80211_hdr *) skb->data;
1204 
1205 	if (likely(sta)) {
1206 		if (!IS_ERR(sta))
1207 			tx->sta = sta;
1208 	} else {
1209 		if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1210 			tx->sta = rcu_dereference(sdata->u.vlan.sta);
1211 			if (!tx->sta && sdata->wdev.use_4addr)
1212 				return TX_DROP;
1213 		} else if (tx->sdata->control_port_protocol == tx->skb->protocol) {
1214 			tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1215 		}
1216 		if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) {
1217 			tx->sta = sta_info_get(sdata, hdr->addr1);
1218 			aggr_check = true;
1219 		}
1220 	}
1221 
1222 	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1223 	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1224 	    ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1225 	    !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1226 		struct tid_ampdu_tx *tid_tx;
1227 
1228 		tid = ieee80211_get_tid(hdr);
1229 		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1230 		if (!tid_tx && aggr_check) {
1231 			ieee80211_aggr_check(sdata, tx->sta, skb);
1232 			tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1233 		}
1234 
1235 		if (tid_tx) {
1236 			bool queued;
1237 
1238 			queued = ieee80211_tx_prep_agg(tx, skb, info,
1239 						       tid_tx, tid);
1240 
1241 			if (unlikely(queued))
1242 				return TX_QUEUED;
1243 		}
1244 	}
1245 
1246 	if (is_multicast_ether_addr(hdr->addr1)) {
1247 		tx->flags &= ~IEEE80211_TX_UNICAST;
1248 		info->flags |= IEEE80211_TX_CTL_NO_ACK;
1249 	} else
1250 		tx->flags |= IEEE80211_TX_UNICAST;
1251 
1252 	if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1253 		if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1254 		    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1255 		    info->flags & IEEE80211_TX_CTL_AMPDU)
1256 			info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1257 	}
1258 
1259 	if (!tx->sta)
1260 		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1261 	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1262 		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1263 		ieee80211_check_fast_xmit(tx->sta);
1264 	}
1265 
1266 	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1267 
1268 	return TX_CONTINUE;
1269 }
1270 
ieee80211_get_txq(struct ieee80211_local * local,struct ieee80211_vif * vif,struct sta_info * sta,struct sk_buff * skb)1271 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1272 					  struct ieee80211_vif *vif,
1273 					  struct sta_info *sta,
1274 					  struct sk_buff *skb)
1275 {
1276 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1277 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1278 	struct ieee80211_txq *txq = NULL;
1279 
1280 	if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1281 	    (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1282 		return NULL;
1283 
1284 	if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
1285 	    unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
1286 		if ((!ieee80211_is_mgmt(hdr->frame_control) ||
1287 		     ieee80211_is_bufferable_mmpdu(hdr->frame_control) ||
1288 		     vif->type == NL80211_IFTYPE_STATION) &&
1289 		    sta && sta->uploaded) {
1290 			/*
1291 			 * This will be NULL if the driver didn't set the
1292 			 * opt-in hardware flag.
1293 			 */
1294 			txq = sta->sta.txq[IEEE80211_NUM_TIDS];
1295 		}
1296 	} else if (sta) {
1297 		u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1298 
1299 		if (!sta->uploaded)
1300 			return NULL;
1301 
1302 		txq = sta->sta.txq[tid];
1303 	} else if (vif) {
1304 		txq = vif->txq;
1305 	}
1306 
1307 	if (!txq)
1308 		return NULL;
1309 
1310 	return to_txq_info(txq);
1311 }
1312 
ieee80211_set_skb_enqueue_time(struct sk_buff * skb)1313 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1314 {
1315 	IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1316 }
1317 
codel_skb_len_func(const struct sk_buff * skb)1318 static u32 codel_skb_len_func(const struct sk_buff *skb)
1319 {
1320 	return skb->len;
1321 }
1322 
codel_skb_time_func(const struct sk_buff * skb)1323 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1324 {
1325 	const struct ieee80211_tx_info *info;
1326 
1327 	info = (const struct ieee80211_tx_info *)skb->cb;
1328 	return info->control.enqueue_time;
1329 }
1330 
codel_dequeue_func(struct codel_vars * cvars,void * ctx)1331 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1332 					  void *ctx)
1333 {
1334 	struct ieee80211_local *local;
1335 	struct txq_info *txqi;
1336 	struct fq *fq;
1337 	struct fq_flow *flow;
1338 
1339 	txqi = ctx;
1340 	local = vif_to_sdata(txqi->txq.vif)->local;
1341 	fq = &local->fq;
1342 
1343 	if (cvars == &txqi->def_cvars)
1344 		flow = &txqi->tin.default_flow;
1345 	else
1346 		flow = &fq->flows[cvars - local->cvars];
1347 
1348 	return fq_flow_dequeue(fq, flow);
1349 }
1350 
codel_drop_func(struct sk_buff * skb,void * ctx)1351 static void codel_drop_func(struct sk_buff *skb,
1352 			    void *ctx)
1353 {
1354 	struct ieee80211_local *local;
1355 	struct ieee80211_hw *hw;
1356 	struct txq_info *txqi;
1357 
1358 	txqi = ctx;
1359 	local = vif_to_sdata(txqi->txq.vif)->local;
1360 	hw = &local->hw;
1361 
1362 	ieee80211_free_txskb(hw, skb);
1363 }
1364 
fq_tin_dequeue_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow)1365 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1366 					   struct fq_tin *tin,
1367 					   struct fq_flow *flow)
1368 {
1369 	struct ieee80211_local *local;
1370 	struct txq_info *txqi;
1371 	struct codel_vars *cvars;
1372 	struct codel_params *cparams;
1373 	struct codel_stats *cstats;
1374 
1375 	local = container_of(fq, struct ieee80211_local, fq);
1376 	txqi = container_of(tin, struct txq_info, tin);
1377 	cstats = &txqi->cstats;
1378 
1379 	if (txqi->txq.sta) {
1380 		struct sta_info *sta = container_of(txqi->txq.sta,
1381 						    struct sta_info, sta);
1382 		cparams = &sta->cparams;
1383 	} else {
1384 		cparams = &local->cparams;
1385 	}
1386 
1387 	if (flow == &tin->default_flow)
1388 		cvars = &txqi->def_cvars;
1389 	else
1390 		cvars = &local->cvars[flow - fq->flows];
1391 
1392 	return codel_dequeue(txqi,
1393 			     &flow->backlog,
1394 			     cparams,
1395 			     cvars,
1396 			     cstats,
1397 			     codel_skb_len_func,
1398 			     codel_skb_time_func,
1399 			     codel_drop_func,
1400 			     codel_dequeue_func);
1401 }
1402 
fq_skb_free_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow,struct sk_buff * skb)1403 static void fq_skb_free_func(struct fq *fq,
1404 			     struct fq_tin *tin,
1405 			     struct fq_flow *flow,
1406 			     struct sk_buff *skb)
1407 {
1408 	struct ieee80211_local *local;
1409 
1410 	local = container_of(fq, struct ieee80211_local, fq);
1411 	ieee80211_free_txskb(&local->hw, skb);
1412 }
1413 
ieee80211_txq_enqueue(struct ieee80211_local * local,struct txq_info * txqi,struct sk_buff * skb)1414 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1415 				  struct txq_info *txqi,
1416 				  struct sk_buff *skb)
1417 {
1418 	struct fq *fq = &local->fq;
1419 	struct fq_tin *tin = &txqi->tin;
1420 	u32 flow_idx = fq_flow_idx(fq, skb);
1421 
1422 	ieee80211_set_skb_enqueue_time(skb);
1423 
1424 	spin_lock_bh(&fq->lock);
1425 	/*
1426 	 * For management frames, don't really apply codel etc.,
1427 	 * we don't want to apply any shaping or anything we just
1428 	 * want to simplify the driver API by having them on the
1429 	 * txqi.
1430 	 */
1431 	if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) {
1432 		IEEE80211_SKB_CB(skb)->control.flags |=
1433 			IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1434 		__skb_queue_tail(&txqi->frags, skb);
1435 	} else {
1436 		fq_tin_enqueue(fq, tin, flow_idx, skb,
1437 			       fq_skb_free_func);
1438 	}
1439 	spin_unlock_bh(&fq->lock);
1440 }
1441 
fq_vlan_filter_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow,struct sk_buff * skb,void * data)1442 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1443 				struct fq_flow *flow, struct sk_buff *skb,
1444 				void *data)
1445 {
1446 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1447 
1448 	return info->control.vif == data;
1449 }
1450 
ieee80211_txq_remove_vlan(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1451 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1452 			       struct ieee80211_sub_if_data *sdata)
1453 {
1454 	struct fq *fq = &local->fq;
1455 	struct txq_info *txqi;
1456 	struct fq_tin *tin;
1457 	struct ieee80211_sub_if_data *ap;
1458 
1459 	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1460 		return;
1461 
1462 	ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1463 
1464 	if (!ap->vif.txq)
1465 		return;
1466 
1467 	txqi = to_txq_info(ap->vif.txq);
1468 	tin = &txqi->tin;
1469 
1470 	spin_lock_bh(&fq->lock);
1471 	fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1472 		      fq_skb_free_func);
1473 	spin_unlock_bh(&fq->lock);
1474 }
1475 
ieee80211_txq_init(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct txq_info * txqi,int tid)1476 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1477 			struct sta_info *sta,
1478 			struct txq_info *txqi, int tid)
1479 {
1480 	fq_tin_init(&txqi->tin);
1481 	codel_vars_init(&txqi->def_cvars);
1482 	codel_stats_init(&txqi->cstats);
1483 	__skb_queue_head_init(&txqi->frags);
1484 	RB_CLEAR_NODE(&txqi->schedule_order);
1485 
1486 	txqi->txq.vif = &sdata->vif;
1487 
1488 	if (!sta) {
1489 		sdata->vif.txq = &txqi->txq;
1490 		txqi->txq.tid = 0;
1491 		txqi->txq.ac = IEEE80211_AC_BE;
1492 
1493 		return;
1494 	}
1495 
1496 	if (tid == IEEE80211_NUM_TIDS) {
1497 		if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1498 			/* Drivers need to opt in to the management MPDU TXQ */
1499 			if (!ieee80211_hw_check(&sdata->local->hw,
1500 						STA_MMPDU_TXQ))
1501 				return;
1502 		} else if (!ieee80211_hw_check(&sdata->local->hw,
1503 					       BUFF_MMPDU_TXQ)) {
1504 			/* Drivers need to opt in to the bufferable MMPDU TXQ */
1505 			return;
1506 		}
1507 		txqi->txq.ac = IEEE80211_AC_VO;
1508 	} else {
1509 		txqi->txq.ac = ieee80211_ac_from_tid(tid);
1510 	}
1511 
1512 	txqi->txq.sta = &sta->sta;
1513 	txqi->txq.tid = tid;
1514 	sta->sta.txq[tid] = &txqi->txq;
1515 }
1516 
ieee80211_txq_purge(struct ieee80211_local * local,struct txq_info * txqi)1517 void ieee80211_txq_purge(struct ieee80211_local *local,
1518 			 struct txq_info *txqi)
1519 {
1520 	struct fq *fq = &local->fq;
1521 	struct fq_tin *tin = &txqi->tin;
1522 
1523 	spin_lock_bh(&fq->lock);
1524 	fq_tin_reset(fq, tin, fq_skb_free_func);
1525 	ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1526 	spin_unlock_bh(&fq->lock);
1527 
1528 	ieee80211_unschedule_txq(&local->hw, &txqi->txq, true);
1529 }
1530 
ieee80211_txq_set_params(struct ieee80211_local * local)1531 void ieee80211_txq_set_params(struct ieee80211_local *local)
1532 {
1533 	if (local->hw.wiphy->txq_limit)
1534 		local->fq.limit = local->hw.wiphy->txq_limit;
1535 	else
1536 		local->hw.wiphy->txq_limit = local->fq.limit;
1537 
1538 	if (local->hw.wiphy->txq_memory_limit)
1539 		local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1540 	else
1541 		local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1542 
1543 	if (local->hw.wiphy->txq_quantum)
1544 		local->fq.quantum = local->hw.wiphy->txq_quantum;
1545 	else
1546 		local->hw.wiphy->txq_quantum = local->fq.quantum;
1547 }
1548 
ieee80211_txq_setup_flows(struct ieee80211_local * local)1549 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1550 {
1551 	struct fq *fq = &local->fq;
1552 	int ret;
1553 	int i;
1554 	bool supp_vht = false;
1555 	enum nl80211_band band;
1556 
1557 	if (!local->ops->wake_tx_queue)
1558 		return 0;
1559 
1560 	ret = fq_init(fq, 4096);
1561 	if (ret)
1562 		return ret;
1563 
1564 	/*
1565 	 * If the hardware doesn't support VHT, it is safe to limit the maximum
1566 	 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1567 	 */
1568 	for (band = 0; band < NUM_NL80211_BANDS; band++) {
1569 		struct ieee80211_supported_band *sband;
1570 
1571 		sband = local->hw.wiphy->bands[band];
1572 		if (!sband)
1573 			continue;
1574 
1575 		supp_vht = supp_vht || sband->vht_cap.vht_supported;
1576 	}
1577 
1578 	if (!supp_vht)
1579 		fq->memory_limit = 4 << 20; /* 4 Mbytes */
1580 
1581 	codel_params_init(&local->cparams);
1582 	local->cparams.interval = MS2TIME(100);
1583 	local->cparams.target = MS2TIME(20);
1584 	local->cparams.ecn = true;
1585 
1586 	local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1587 			       GFP_KERNEL);
1588 	if (!local->cvars) {
1589 		spin_lock_bh(&fq->lock);
1590 		fq_reset(fq, fq_skb_free_func);
1591 		spin_unlock_bh(&fq->lock);
1592 		return -ENOMEM;
1593 	}
1594 
1595 	for (i = 0; i < fq->flows_cnt; i++)
1596 		codel_vars_init(&local->cvars[i]);
1597 
1598 	ieee80211_txq_set_params(local);
1599 
1600 	return 0;
1601 }
1602 
ieee80211_txq_teardown_flows(struct ieee80211_local * local)1603 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1604 {
1605 	struct fq *fq = &local->fq;
1606 
1607 	if (!local->ops->wake_tx_queue)
1608 		return;
1609 
1610 	kfree(local->cvars);
1611 	local->cvars = NULL;
1612 
1613 	spin_lock_bh(&fq->lock);
1614 	fq_reset(fq, fq_skb_free_func);
1615 	spin_unlock_bh(&fq->lock);
1616 }
1617 
ieee80211_queue_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)1618 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1619 				struct ieee80211_sub_if_data *sdata,
1620 				struct sta_info *sta,
1621 				struct sk_buff *skb)
1622 {
1623 	struct ieee80211_vif *vif;
1624 	struct txq_info *txqi;
1625 
1626 	if (!local->ops->wake_tx_queue ||
1627 	    sdata->vif.type == NL80211_IFTYPE_MONITOR)
1628 		return false;
1629 
1630 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1631 		sdata = container_of(sdata->bss,
1632 				     struct ieee80211_sub_if_data, u.ap);
1633 
1634 	vif = &sdata->vif;
1635 	txqi = ieee80211_get_txq(local, vif, sta, skb);
1636 
1637 	if (!txqi)
1638 		return false;
1639 
1640 	ieee80211_txq_enqueue(local, txqi, skb);
1641 
1642 	schedule_and_wake_txq(local, txqi);
1643 
1644 	return true;
1645 }
1646 
ieee80211_tx_frags(struct ieee80211_local * local,struct ieee80211_vif * vif,struct sta_info * sta,struct sk_buff_head * skbs,bool txpending)1647 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1648 			       struct ieee80211_vif *vif,
1649 			       struct sta_info *sta,
1650 			       struct sk_buff_head *skbs,
1651 			       bool txpending)
1652 {
1653 	struct ieee80211_tx_control control = {};
1654 	struct sk_buff *skb, *tmp;
1655 	unsigned long flags;
1656 
1657 	skb_queue_walk_safe(skbs, skb, tmp) {
1658 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1659 		int q = info->hw_queue;
1660 
1661 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1662 		if (WARN_ON_ONCE(q >= local->hw.queues)) {
1663 			__skb_unlink(skb, skbs);
1664 			ieee80211_free_txskb(&local->hw, skb);
1665 			continue;
1666 		}
1667 #endif
1668 
1669 		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1670 		if (local->queue_stop_reasons[q] ||
1671 		    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1672 			if (unlikely(info->flags &
1673 				     IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1674 				if (local->queue_stop_reasons[q] &
1675 				    ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1676 					/*
1677 					 * Drop off-channel frames if queues
1678 					 * are stopped for any reason other
1679 					 * than off-channel operation. Never
1680 					 * queue them.
1681 					 */
1682 					spin_unlock_irqrestore(
1683 						&local->queue_stop_reason_lock,
1684 						flags);
1685 					ieee80211_purge_tx_queue(&local->hw,
1686 								 skbs);
1687 					return true;
1688 				}
1689 			} else {
1690 
1691 				/*
1692 				 * Since queue is stopped, queue up frames for
1693 				 * later transmission from the tx-pending
1694 				 * tasklet when the queue is woken again.
1695 				 */
1696 				if (txpending)
1697 					skb_queue_splice_init(skbs,
1698 							      &local->pending[q]);
1699 				else
1700 					skb_queue_splice_tail_init(skbs,
1701 								   &local->pending[q]);
1702 
1703 				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1704 						       flags);
1705 				return false;
1706 			}
1707 		}
1708 		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1709 
1710 		info->control.vif = vif;
1711 		control.sta = sta ? &sta->sta : NULL;
1712 
1713 		__skb_unlink(skb, skbs);
1714 		drv_tx(local, &control, skb);
1715 	}
1716 
1717 	return true;
1718 }
1719 
1720 /*
1721  * Returns false if the frame couldn't be transmitted but was queued instead.
1722  */
__ieee80211_tx(struct ieee80211_local * local,struct sk_buff_head * skbs,struct sta_info * sta,bool txpending)1723 static bool __ieee80211_tx(struct ieee80211_local *local,
1724 			   struct sk_buff_head *skbs, struct sta_info *sta,
1725 			   bool txpending)
1726 {
1727 	struct ieee80211_tx_info *info;
1728 	struct ieee80211_sub_if_data *sdata;
1729 	struct ieee80211_vif *vif;
1730 	struct sk_buff *skb;
1731 	bool result;
1732 
1733 	if (WARN_ON(skb_queue_empty(skbs)))
1734 		return true;
1735 
1736 	skb = skb_peek(skbs);
1737 	info = IEEE80211_SKB_CB(skb);
1738 	sdata = vif_to_sdata(info->control.vif);
1739 	if (sta && !sta->uploaded)
1740 		sta = NULL;
1741 
1742 	switch (sdata->vif.type) {
1743 	case NL80211_IFTYPE_MONITOR:
1744 		if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1745 			vif = &sdata->vif;
1746 			break;
1747 		}
1748 		sdata = rcu_dereference(local->monitor_sdata);
1749 		if (sdata) {
1750 			vif = &sdata->vif;
1751 			info->hw_queue =
1752 				vif->hw_queue[skb_get_queue_mapping(skb)];
1753 		} else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1754 			ieee80211_purge_tx_queue(&local->hw, skbs);
1755 			return true;
1756 		} else
1757 			vif = NULL;
1758 		break;
1759 	case NL80211_IFTYPE_AP_VLAN:
1760 		sdata = container_of(sdata->bss,
1761 				     struct ieee80211_sub_if_data, u.ap);
1762 		fallthrough;
1763 	default:
1764 		vif = &sdata->vif;
1765 		break;
1766 	}
1767 
1768 	result = ieee80211_tx_frags(local, vif, sta, skbs, txpending);
1769 
1770 	WARN_ON_ONCE(!skb_queue_empty(skbs));
1771 
1772 	return result;
1773 }
1774 
1775 /*
1776  * Invoke TX handlers, return 0 on success and non-zero if the
1777  * frame was dropped or queued.
1778  *
1779  * The handlers are split into an early and late part. The latter is everything
1780  * that can be sensitive to reordering, and will be deferred to after packets
1781  * are dequeued from the intermediate queues (when they are enabled).
1782  */
invoke_tx_handlers_early(struct ieee80211_tx_data * tx)1783 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1784 {
1785 	ieee80211_tx_result res = TX_DROP;
1786 
1787 #define CALL_TXH(txh) \
1788 	do {				\
1789 		res = txh(tx);		\
1790 		if (res != TX_CONTINUE)	\
1791 			goto txh_done;	\
1792 	} while (0)
1793 
1794 	CALL_TXH(ieee80211_tx_h_dynamic_ps);
1795 	CALL_TXH(ieee80211_tx_h_check_assoc);
1796 	CALL_TXH(ieee80211_tx_h_ps_buf);
1797 	CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1798 	CALL_TXH(ieee80211_tx_h_select_key);
1799 
1800  txh_done:
1801 	if (unlikely(res == TX_DROP)) {
1802 		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1803 		if (tx->skb)
1804 			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1805 		else
1806 			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1807 		return -1;
1808 	} else if (unlikely(res == TX_QUEUED)) {
1809 		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1810 		return -1;
1811 	}
1812 
1813 	return 0;
1814 }
1815 
1816 /*
1817  * Late handlers can be called while the sta lock is held. Handlers that can
1818  * cause packets to be generated will cause deadlock!
1819  */
invoke_tx_handlers_late(struct ieee80211_tx_data * tx)1820 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1821 {
1822 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1823 	ieee80211_tx_result res = TX_CONTINUE;
1824 
1825 	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1826 		CALL_TXH(ieee80211_tx_h_rate_ctrl);
1827 
1828 	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1829 		__skb_queue_tail(&tx->skbs, tx->skb);
1830 		tx->skb = NULL;
1831 		goto txh_done;
1832 	}
1833 
1834 	CALL_TXH(ieee80211_tx_h_michael_mic_add);
1835 	CALL_TXH(ieee80211_tx_h_sequence);
1836 	CALL_TXH(ieee80211_tx_h_fragment);
1837 	/* handlers after fragment must be aware of tx info fragmentation! */
1838 	CALL_TXH(ieee80211_tx_h_stats);
1839 	CALL_TXH(ieee80211_tx_h_encrypt);
1840 	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1841 		CALL_TXH(ieee80211_tx_h_calculate_duration);
1842 #undef CALL_TXH
1843 
1844  txh_done:
1845 	if (unlikely(res == TX_DROP)) {
1846 		I802_DEBUG_INC(tx->local->tx_handlers_drop);
1847 		if (tx->skb)
1848 			ieee80211_free_txskb(&tx->local->hw, tx->skb);
1849 		else
1850 			ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1851 		return -1;
1852 	} else if (unlikely(res == TX_QUEUED)) {
1853 		I802_DEBUG_INC(tx->local->tx_handlers_queued);
1854 		return -1;
1855 	}
1856 
1857 	return 0;
1858 }
1859 
invoke_tx_handlers(struct ieee80211_tx_data * tx)1860 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1861 {
1862 	int r = invoke_tx_handlers_early(tx);
1863 
1864 	if (r)
1865 		return r;
1866 	return invoke_tx_handlers_late(tx);
1867 }
1868 
ieee80211_tx_prepare_skb(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct sk_buff * skb,int band,struct ieee80211_sta ** sta)1869 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1870 			      struct ieee80211_vif *vif, struct sk_buff *skb,
1871 			      int band, struct ieee80211_sta **sta)
1872 {
1873 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1874 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1875 	struct ieee80211_tx_data tx;
1876 	struct sk_buff *skb2;
1877 
1878 	if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1879 		return false;
1880 
1881 	info->band = band;
1882 	info->control.vif = vif;
1883 	info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1884 
1885 	if (invoke_tx_handlers(&tx))
1886 		return false;
1887 
1888 	if (sta) {
1889 		if (tx.sta)
1890 			*sta = &tx.sta->sta;
1891 		else
1892 			*sta = NULL;
1893 	}
1894 
1895 	/* this function isn't suitable for fragmented data frames */
1896 	skb2 = __skb_dequeue(&tx.skbs);
1897 	if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1898 		ieee80211_free_txskb(hw, skb2);
1899 		ieee80211_purge_tx_queue(hw, &tx.skbs);
1900 		return false;
1901 	}
1902 
1903 	return true;
1904 }
1905 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1906 
1907 /*
1908  * Returns false if the frame couldn't be transmitted but was queued instead.
1909  */
ieee80211_tx(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb,bool txpending)1910 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1911 			 struct sta_info *sta, struct sk_buff *skb,
1912 			 bool txpending)
1913 {
1914 	struct ieee80211_local *local = sdata->local;
1915 	struct ieee80211_tx_data tx;
1916 	ieee80211_tx_result res_prepare;
1917 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1918 	bool result = true;
1919 
1920 	if (unlikely(skb->len < 10)) {
1921 		dev_kfree_skb(skb);
1922 		return true;
1923 	}
1924 
1925 	/* initialises tx */
1926 	res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1927 
1928 	if (unlikely(res_prepare == TX_DROP)) {
1929 		ieee80211_free_txskb(&local->hw, skb);
1930 		return true;
1931 	} else if (unlikely(res_prepare == TX_QUEUED)) {
1932 		return true;
1933 	}
1934 
1935 	/* set up hw_queue value early */
1936 	if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1937 	    !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1938 		info->hw_queue =
1939 			sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1940 
1941 	if (invoke_tx_handlers_early(&tx))
1942 		return true;
1943 
1944 	if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1945 		return true;
1946 
1947 	if (!invoke_tx_handlers_late(&tx))
1948 		result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending);
1949 
1950 	return result;
1951 }
1952 
1953 /* device xmit handlers */
1954 
1955 enum ieee80211_encrypt {
1956 	ENCRYPT_NO,
1957 	ENCRYPT_MGMT,
1958 	ENCRYPT_DATA,
1959 };
1960 
ieee80211_skb_resize(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int head_need,enum ieee80211_encrypt encrypt)1961 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1962 				struct sk_buff *skb,
1963 				int head_need,
1964 				enum ieee80211_encrypt encrypt)
1965 {
1966 	struct ieee80211_local *local = sdata->local;
1967 	bool enc_tailroom;
1968 	int tail_need = 0;
1969 
1970 	enc_tailroom = encrypt == ENCRYPT_MGMT ||
1971 		       (encrypt == ENCRYPT_DATA &&
1972 			sdata->crypto_tx_tailroom_needed_cnt);
1973 
1974 	if (enc_tailroom) {
1975 		tail_need = IEEE80211_ENCRYPT_TAILROOM;
1976 		tail_need -= skb_tailroom(skb);
1977 		tail_need = max_t(int, tail_need, 0);
1978 	}
1979 
1980 	if (skb_cloned(skb) &&
1981 	    (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1982 	     !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
1983 		I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1984 	else if (head_need || tail_need)
1985 		I802_DEBUG_INC(local->tx_expand_skb_head);
1986 	else
1987 		return 0;
1988 
1989 	if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1990 		wiphy_debug(local->hw.wiphy,
1991 			    "failed to reallocate TX buffer\n");
1992 		return -ENOMEM;
1993 	}
1994 
1995 	return 0;
1996 }
1997 
ieee80211_xmit(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)1998 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1999 		    struct sta_info *sta, struct sk_buff *skb)
2000 {
2001 	struct ieee80211_local *local = sdata->local;
2002 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2003 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2004 	int headroom;
2005 	enum ieee80211_encrypt encrypt;
2006 
2007 	if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)
2008 		encrypt = ENCRYPT_NO;
2009 	else if (ieee80211_is_mgmt(hdr->frame_control))
2010 		encrypt = ENCRYPT_MGMT;
2011 	else
2012 		encrypt = ENCRYPT_DATA;
2013 
2014 	headroom = local->tx_headroom;
2015 	if (encrypt != ENCRYPT_NO)
2016 		headroom += sdata->encrypt_headroom;
2017 	headroom -= skb_headroom(skb);
2018 	headroom = max_t(int, 0, headroom);
2019 
2020 	if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) {
2021 		ieee80211_free_txskb(&local->hw, skb);
2022 		return;
2023 	}
2024 
2025 	/* reload after potential resize */
2026 	hdr = (struct ieee80211_hdr *) skb->data;
2027 	info->control.vif = &sdata->vif;
2028 
2029 	if (ieee80211_vif_is_mesh(&sdata->vif)) {
2030 		if (ieee80211_is_data(hdr->frame_control) &&
2031 		    is_unicast_ether_addr(hdr->addr1)) {
2032 			if (mesh_nexthop_resolve(sdata, skb))
2033 				return; /* skb queued: don't free */
2034 		} else {
2035 			ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2036 		}
2037 	}
2038 
2039 	ieee80211_set_qos_hdr(sdata, skb);
2040 	ieee80211_tx(sdata, sta, skb, false);
2041 }
2042 
ieee80211_validate_radiotap_len(struct sk_buff * skb)2043 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb)
2044 {
2045 	struct ieee80211_radiotap_header *rthdr =
2046 		(struct ieee80211_radiotap_header *)skb->data;
2047 
2048 	/* check for not even having the fixed radiotap header part */
2049 	if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2050 		return false; /* too short to be possibly valid */
2051 
2052 	/* is it a header version we can trust to find length from? */
2053 	if (unlikely(rthdr->it_version))
2054 		return false; /* only version 0 is supported */
2055 
2056 	/* does the skb contain enough to deliver on the alleged length? */
2057 	if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data)))
2058 		return false; /* skb too short for claimed rt header extent */
2059 
2060 	return true;
2061 }
2062 
ieee80211_parse_tx_radiotap(struct sk_buff * skb,struct net_device * dev)2063 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb,
2064 				 struct net_device *dev)
2065 {
2066 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2067 	struct ieee80211_radiotap_iterator iterator;
2068 	struct ieee80211_radiotap_header *rthdr =
2069 		(struct ieee80211_radiotap_header *) skb->data;
2070 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2071 	int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2072 						   NULL);
2073 	u16 txflags;
2074 	u16 rate = 0;
2075 	bool rate_found = false;
2076 	u8 rate_retries = 0;
2077 	u16 rate_flags = 0;
2078 	u8 mcs_known, mcs_flags, mcs_bw;
2079 	u16 vht_known;
2080 	u8 vht_mcs = 0, vht_nss = 0;
2081 	int i;
2082 
2083 	if (!ieee80211_validate_radiotap_len(skb))
2084 		return false;
2085 
2086 	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2087 		       IEEE80211_TX_CTL_DONTFRAG;
2088 
2089 	/*
2090 	 * for every radiotap entry that is present
2091 	 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2092 	 * entries present, or -EINVAL on error)
2093 	 */
2094 
2095 	while (!ret) {
2096 		ret = ieee80211_radiotap_iterator_next(&iterator);
2097 
2098 		if (ret)
2099 			continue;
2100 
2101 		/* see if this argument is something we can use */
2102 		switch (iterator.this_arg_index) {
2103 		/*
2104 		 * You must take care when dereferencing iterator.this_arg
2105 		 * for multibyte types... the pointer is not aligned.  Use
2106 		 * get_unaligned((type *)iterator.this_arg) to dereference
2107 		 * iterator.this_arg for type "type" safely on all arches.
2108 		*/
2109 		case IEEE80211_RADIOTAP_FLAGS:
2110 			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2111 				/*
2112 				 * this indicates that the skb we have been
2113 				 * handed has the 32-bit FCS CRC at the end...
2114 				 * we should react to that by snipping it off
2115 				 * because it will be recomputed and added
2116 				 * on transmission
2117 				 */
2118 				if (skb->len < (iterator._max_length + FCS_LEN))
2119 					return false;
2120 
2121 				skb_trim(skb, skb->len - FCS_LEN);
2122 			}
2123 			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2124 				info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2125 			if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2126 				info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2127 			break;
2128 
2129 		case IEEE80211_RADIOTAP_TX_FLAGS:
2130 			txflags = get_unaligned_le16(iterator.this_arg);
2131 			if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2132 				info->flags |= IEEE80211_TX_CTL_NO_ACK;
2133 			if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO)
2134 				info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
2135 			if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER)
2136 				info->control.flags |=
2137 					IEEE80211_TX_CTRL_DONT_REORDER;
2138 			break;
2139 
2140 		case IEEE80211_RADIOTAP_RATE:
2141 			rate = *iterator.this_arg;
2142 			rate_flags = 0;
2143 			rate_found = true;
2144 			break;
2145 
2146 		case IEEE80211_RADIOTAP_DATA_RETRIES:
2147 			rate_retries = *iterator.this_arg;
2148 			break;
2149 
2150 		case IEEE80211_RADIOTAP_MCS:
2151 			mcs_known = iterator.this_arg[0];
2152 			mcs_flags = iterator.this_arg[1];
2153 			if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2154 				break;
2155 
2156 			rate_found = true;
2157 			rate = iterator.this_arg[2];
2158 			rate_flags = IEEE80211_TX_RC_MCS;
2159 
2160 			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2161 			    mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2162 				rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2163 
2164 			mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2165 			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2166 			    mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2167 				rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2168 
2169 			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC &&
2170 			    mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC)
2171 				info->flags |= IEEE80211_TX_CTL_LDPC;
2172 
2173 			if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) {
2174 				u8 stbc = u8_get_bits(mcs_flags,
2175 						      IEEE80211_RADIOTAP_MCS_STBC_MASK);
2176 
2177 				info->flags |=
2178 					u32_encode_bits(stbc,
2179 							IEEE80211_TX_CTL_STBC);
2180 			}
2181 			break;
2182 
2183 		case IEEE80211_RADIOTAP_VHT:
2184 			vht_known = get_unaligned_le16(iterator.this_arg);
2185 			rate_found = true;
2186 
2187 			rate_flags = IEEE80211_TX_RC_VHT_MCS;
2188 			if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2189 			    (iterator.this_arg[2] &
2190 			     IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2191 				rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2192 			if (vht_known &
2193 			    IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2194 				if (iterator.this_arg[3] == 1)
2195 					rate_flags |=
2196 						IEEE80211_TX_RC_40_MHZ_WIDTH;
2197 				else if (iterator.this_arg[3] == 4)
2198 					rate_flags |=
2199 						IEEE80211_TX_RC_80_MHZ_WIDTH;
2200 				else if (iterator.this_arg[3] == 11)
2201 					rate_flags |=
2202 						IEEE80211_TX_RC_160_MHZ_WIDTH;
2203 			}
2204 
2205 			vht_mcs = iterator.this_arg[4] >> 4;
2206 			if (vht_mcs > 11)
2207 				vht_mcs = 0;
2208 			vht_nss = iterator.this_arg[4] & 0xF;
2209 			if (!vht_nss || vht_nss > 8)
2210 				vht_nss = 1;
2211 			break;
2212 
2213 		/*
2214 		 * Please update the file
2215 		 * Documentation/networking/mac80211-injection.rst
2216 		 * when parsing new fields here.
2217 		 */
2218 
2219 		default:
2220 			break;
2221 		}
2222 	}
2223 
2224 	if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2225 		return false;
2226 
2227 	if (rate_found) {
2228 		struct ieee80211_supported_band *sband =
2229 			local->hw.wiphy->bands[info->band];
2230 
2231 		info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2232 
2233 		for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2234 			info->control.rates[i].idx = -1;
2235 			info->control.rates[i].flags = 0;
2236 			info->control.rates[i].count = 0;
2237 		}
2238 
2239 		if (rate_flags & IEEE80211_TX_RC_MCS) {
2240 			info->control.rates[0].idx = rate;
2241 		} else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2242 			ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2243 					       vht_nss);
2244 		} else if (sband) {
2245 			for (i = 0; i < sband->n_bitrates; i++) {
2246 				if (rate * 5 != sband->bitrates[i].bitrate)
2247 					continue;
2248 
2249 				info->control.rates[0].idx = i;
2250 				break;
2251 			}
2252 		}
2253 
2254 		if (info->control.rates[0].idx < 0)
2255 			info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2256 
2257 		info->control.rates[0].flags = rate_flags;
2258 		info->control.rates[0].count = min_t(u8, rate_retries + 1,
2259 						     local->hw.max_rate_tries);
2260 	}
2261 
2262 	return true;
2263 }
2264 
ieee80211_monitor_start_xmit(struct sk_buff * skb,struct net_device * dev)2265 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2266 					 struct net_device *dev)
2267 {
2268 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2269 	struct ieee80211_chanctx_conf *chanctx_conf;
2270 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2271 	struct ieee80211_hdr *hdr;
2272 	struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2273 	struct cfg80211_chan_def *chandef;
2274 	u16 len_rthdr;
2275 	int hdrlen;
2276 
2277 	memset(info, 0, sizeof(*info));
2278 	info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2279 		      IEEE80211_TX_CTL_INJECTED;
2280 
2281 	/* Sanity-check the length of the radiotap header */
2282 	if (!ieee80211_validate_radiotap_len(skb))
2283 		goto fail;
2284 
2285 	/* we now know there is a radiotap header with a length we can use */
2286 	len_rthdr = ieee80211_get_radiotap_len(skb->data);
2287 
2288 	/*
2289 	 * fix up the pointers accounting for the radiotap
2290 	 * header still being in there.  We are being given
2291 	 * a precooked IEEE80211 header so no need for
2292 	 * normal processing
2293 	 */
2294 	skb_set_mac_header(skb, len_rthdr);
2295 	/*
2296 	 * these are just fixed to the end of the rt area since we
2297 	 * don't have any better information and at this point, nobody cares
2298 	 */
2299 	skb_set_network_header(skb, len_rthdr);
2300 	skb_set_transport_header(skb, len_rthdr);
2301 
2302 	if (skb->len < len_rthdr + 2)
2303 		goto fail;
2304 
2305 	hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2306 	hdrlen = ieee80211_hdrlen(hdr->frame_control);
2307 
2308 	if (skb->len < len_rthdr + hdrlen)
2309 		goto fail;
2310 
2311 	/*
2312 	 * Initialize skb->protocol if the injected frame is a data frame
2313 	 * carrying a rfc1042 header
2314 	 */
2315 	if (ieee80211_is_data(hdr->frame_control) &&
2316 	    skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2317 		u8 *payload = (u8 *)hdr + hdrlen;
2318 
2319 		if (ether_addr_equal(payload, rfc1042_header))
2320 			skb->protocol = cpu_to_be16((payload[6] << 8) |
2321 						    payload[7]);
2322 	}
2323 
2324 	rcu_read_lock();
2325 
2326 	/*
2327 	 * We process outgoing injected frames that have a local address
2328 	 * we handle as though they are non-injected frames.
2329 	 * This code here isn't entirely correct, the local MAC address
2330 	 * isn't always enough to find the interface to use; for proper
2331 	 * VLAN support we have an nl80211-based mechanism.
2332 	 *
2333 	 * This is necessary, for example, for old hostapd versions that
2334 	 * don't use nl80211-based management TX/RX.
2335 	 */
2336 	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2337 
2338 	list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2339 		if (!ieee80211_sdata_running(tmp_sdata))
2340 			continue;
2341 		if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2342 		    tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2343 			continue;
2344 		if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2345 			sdata = tmp_sdata;
2346 			break;
2347 		}
2348 	}
2349 
2350 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2351 	if (!chanctx_conf) {
2352 		tmp_sdata = rcu_dereference(local->monitor_sdata);
2353 		if (tmp_sdata)
2354 			chanctx_conf =
2355 				rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf);
2356 	}
2357 
2358 	if (chanctx_conf)
2359 		chandef = &chanctx_conf->def;
2360 	else if (!local->use_chanctx)
2361 		chandef = &local->_oper_chandef;
2362 	else
2363 		goto fail_rcu;
2364 
2365 	/*
2366 	 * Frame injection is not allowed if beaconing is not allowed
2367 	 * or if we need radar detection. Beaconing is usually not allowed when
2368 	 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2369 	 * Passive scan is also used in world regulatory domains where
2370 	 * your country is not known and as such it should be treated as
2371 	 * NO TX unless the channel is explicitly allowed in which case
2372 	 * your current regulatory domain would not have the passive scan
2373 	 * flag.
2374 	 *
2375 	 * Since AP mode uses monitor interfaces to inject/TX management
2376 	 * frames we can make AP mode the exception to this rule once it
2377 	 * supports radar detection as its implementation can deal with
2378 	 * radar detection by itself. We can do that later by adding a
2379 	 * monitor flag interfaces used for AP support.
2380 	 */
2381 	if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2382 				     sdata->vif.type))
2383 		goto fail_rcu;
2384 
2385 	info->band = chandef->chan->band;
2386 
2387 	/* Initialize skb->priority according to frame type and TID class,
2388 	 * with respect to the sub interface that the frame will actually
2389 	 * be transmitted on. If the DONT_REORDER flag is set, the original
2390 	 * skb-priority is preserved to assure frames injected with this
2391 	 * flag are not reordered relative to each other.
2392 	 */
2393 	ieee80211_select_queue_80211(sdata, skb, hdr);
2394 	skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority));
2395 
2396 	/*
2397 	 * Process the radiotap header. This will now take into account the
2398 	 * selected chandef above to accurately set injection rates and
2399 	 * retransmissions.
2400 	 */
2401 	if (!ieee80211_parse_tx_radiotap(skb, dev))
2402 		goto fail_rcu;
2403 
2404 	/* remove the injection radiotap header */
2405 	skb_pull(skb, len_rthdr);
2406 
2407 	ieee80211_xmit(sdata, NULL, skb);
2408 	rcu_read_unlock();
2409 
2410 	return NETDEV_TX_OK;
2411 
2412 fail_rcu:
2413 	rcu_read_unlock();
2414 fail:
2415 	dev_kfree_skb(skb);
2416 	return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2417 }
2418 
ieee80211_is_tdls_setup(struct sk_buff * skb)2419 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2420 {
2421 	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2422 
2423 	return ethertype == ETH_P_TDLS &&
2424 	       skb->len > 14 &&
2425 	       skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2426 }
2427 
ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct sta_info ** sta_out)2428 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2429 			    struct sk_buff *skb,
2430 			    struct sta_info **sta_out)
2431 {
2432 	struct sta_info *sta;
2433 
2434 	switch (sdata->vif.type) {
2435 	case NL80211_IFTYPE_AP_VLAN:
2436 		sta = rcu_dereference(sdata->u.vlan.sta);
2437 		if (sta) {
2438 			*sta_out = sta;
2439 			return 0;
2440 		} else if (sdata->wdev.use_4addr) {
2441 			return -ENOLINK;
2442 		}
2443 		fallthrough;
2444 	case NL80211_IFTYPE_AP:
2445 	case NL80211_IFTYPE_OCB:
2446 	case NL80211_IFTYPE_ADHOC:
2447 		if (is_multicast_ether_addr(skb->data)) {
2448 			*sta_out = ERR_PTR(-ENOENT);
2449 			return 0;
2450 		}
2451 		sta = sta_info_get_bss(sdata, skb->data);
2452 		break;
2453 #ifdef CONFIG_MAC80211_MESH
2454 	case NL80211_IFTYPE_MESH_POINT:
2455 		/* determined much later */
2456 		*sta_out = NULL;
2457 		return 0;
2458 #endif
2459 	case NL80211_IFTYPE_STATION:
2460 		if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2461 			sta = sta_info_get(sdata, skb->data);
2462 			if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2463 				if (test_sta_flag(sta,
2464 						  WLAN_STA_TDLS_PEER_AUTH)) {
2465 					*sta_out = sta;
2466 					return 0;
2467 				}
2468 
2469 				/*
2470 				 * TDLS link during setup - throw out frames to
2471 				 * peer. Allow TDLS-setup frames to unauthorized
2472 				 * peers for the special case of a link teardown
2473 				 * after a TDLS sta is removed due to being
2474 				 * unreachable.
2475 				 */
2476 				if (!ieee80211_is_tdls_setup(skb))
2477 					return -EINVAL;
2478 			}
2479 
2480 		}
2481 
2482 		sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2483 		if (!sta)
2484 			return -ENOLINK;
2485 		break;
2486 	default:
2487 		return -EINVAL;
2488 	}
2489 
2490 	*sta_out = sta ?: ERR_PTR(-ENOENT);
2491 	return 0;
2492 }
2493 
ieee80211_store_ack_skb(struct ieee80211_local * local,struct sk_buff * skb,u32 * info_flags,u64 * cookie)2494 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local,
2495 				   struct sk_buff *skb,
2496 				   u32 *info_flags,
2497 				   u64 *cookie)
2498 {
2499 	struct sk_buff *ack_skb;
2500 	u16 info_id = 0;
2501 
2502 	if (skb->sk)
2503 		ack_skb = skb_clone_sk(skb);
2504 	else
2505 		ack_skb = skb_clone(skb, GFP_ATOMIC);
2506 
2507 	if (ack_skb) {
2508 		unsigned long flags;
2509 		int id;
2510 
2511 		spin_lock_irqsave(&local->ack_status_lock, flags);
2512 		id = idr_alloc(&local->ack_status_frames, ack_skb,
2513 			       1, 0x2000, GFP_ATOMIC);
2514 		spin_unlock_irqrestore(&local->ack_status_lock, flags);
2515 
2516 		if (id >= 0) {
2517 			info_id = id;
2518 			*info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2519 			if (cookie) {
2520 				*cookie = ieee80211_mgmt_tx_cookie(local);
2521 				IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie;
2522 			}
2523 		} else {
2524 			kfree_skb(ack_skb);
2525 		}
2526 	}
2527 
2528 	return info_id;
2529 }
2530 
2531 /**
2532  * ieee80211_build_hdr - build 802.11 header in the given frame
2533  * @sdata: virtual interface to build the header for
2534  * @skb: the skb to build the header in
2535  * @info_flags: skb flags to set
2536  * @sta: the station pointer
2537  * @ctrl_flags: info control flags to set
2538  * @cookie: cookie pointer to fill (if not %NULL)
2539  *
2540  * This function takes the skb with 802.3 header and reformats the header to
2541  * the appropriate IEEE 802.11 header based on which interface the packet is
2542  * being transmitted on.
2543  *
2544  * Note that this function also takes care of the TX status request and
2545  * potential unsharing of the SKB - this needs to be interleaved with the
2546  * header building.
2547  *
2548  * The function requires the read-side RCU lock held
2549  *
2550  * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2551  */
ieee80211_build_hdr(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 info_flags,struct sta_info * sta,u32 ctrl_flags,u64 * cookie)2552 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2553 					   struct sk_buff *skb, u32 info_flags,
2554 					   struct sta_info *sta, u32 ctrl_flags,
2555 					   u64 *cookie)
2556 {
2557 	struct ieee80211_local *local = sdata->local;
2558 	struct ieee80211_tx_info *info;
2559 	int head_need;
2560 	u16 ethertype, hdrlen,  meshhdrlen = 0;
2561 	__le16 fc;
2562 	struct ieee80211_hdr hdr;
2563 	struct ieee80211s_hdr mesh_hdr __maybe_unused;
2564 	struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2565 	const u8 *encaps_data;
2566 	int encaps_len, skip_header_bytes;
2567 	bool wme_sta = false, authorized = false;
2568 	bool tdls_peer;
2569 	bool multicast;
2570 	u16 info_id = 0;
2571 	struct ieee80211_chanctx_conf *chanctx_conf;
2572 	struct ieee80211_sub_if_data *ap_sdata;
2573 	enum nl80211_band band;
2574 	int ret;
2575 
2576 	if (IS_ERR(sta))
2577 		sta = NULL;
2578 
2579 #ifdef CONFIG_MAC80211_DEBUGFS
2580 	if (local->force_tx_status)
2581 		info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2582 #endif
2583 
2584 	/* convert Ethernet header to proper 802.11 header (based on
2585 	 * operation mode) */
2586 	ethertype = (skb->data[12] << 8) | skb->data[13];
2587 	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2588 
2589 	switch (sdata->vif.type) {
2590 	case NL80211_IFTYPE_AP_VLAN:
2591 		if (sdata->wdev.use_4addr) {
2592 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2593 			/* RA TA DA SA */
2594 			memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2595 			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2596 			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2597 			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2598 			hdrlen = 30;
2599 			authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2600 			wme_sta = sta->sta.wme;
2601 		}
2602 		ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2603 					u.ap);
2604 		chanctx_conf = rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf);
2605 		if (!chanctx_conf) {
2606 			ret = -ENOTCONN;
2607 			goto free;
2608 		}
2609 		band = chanctx_conf->def.chan->band;
2610 		if (sdata->wdev.use_4addr)
2611 			break;
2612 		fallthrough;
2613 	case NL80211_IFTYPE_AP:
2614 		if (sdata->vif.type == NL80211_IFTYPE_AP)
2615 			chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2616 		if (!chanctx_conf) {
2617 			ret = -ENOTCONN;
2618 			goto free;
2619 		}
2620 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2621 		/* DA BSSID SA */
2622 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2623 		memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2624 		memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2625 		hdrlen = 24;
2626 		band = chanctx_conf->def.chan->band;
2627 		break;
2628 #ifdef CONFIG_MAC80211_MESH
2629 	case NL80211_IFTYPE_MESH_POINT:
2630 		if (!is_multicast_ether_addr(skb->data)) {
2631 			struct sta_info *next_hop;
2632 			bool mpp_lookup = true;
2633 
2634 			mpath = mesh_path_lookup(sdata, skb->data);
2635 			if (mpath) {
2636 				mpp_lookup = false;
2637 				next_hop = rcu_dereference(mpath->next_hop);
2638 				if (!next_hop ||
2639 				    !(mpath->flags & (MESH_PATH_ACTIVE |
2640 						      MESH_PATH_RESOLVING)))
2641 					mpp_lookup = true;
2642 			}
2643 
2644 			if (mpp_lookup) {
2645 				mppath = mpp_path_lookup(sdata, skb->data);
2646 				if (mppath)
2647 					mppath->exp_time = jiffies;
2648 			}
2649 
2650 			if (mppath && mpath)
2651 				mesh_path_del(sdata, mpath->dst);
2652 		}
2653 
2654 		/*
2655 		 * Use address extension if it is a packet from
2656 		 * another interface or if we know the destination
2657 		 * is being proxied by a portal (i.e. portal address
2658 		 * differs from proxied address)
2659 		 */
2660 		if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2661 		    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2662 			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2663 					skb->data, skb->data + ETH_ALEN);
2664 			meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2665 							       NULL, NULL);
2666 		} else {
2667 			/* DS -> MBSS (802.11-2012 13.11.3.3).
2668 			 * For unicast with unknown forwarding information,
2669 			 * destination might be in the MBSS or if that fails
2670 			 * forwarded to another mesh gate. In either case
2671 			 * resolution will be handled in ieee80211_xmit(), so
2672 			 * leave the original DA. This also works for mcast */
2673 			const u8 *mesh_da = skb->data;
2674 
2675 			if (mppath)
2676 				mesh_da = mppath->mpp;
2677 			else if (mpath)
2678 				mesh_da = mpath->dst;
2679 
2680 			hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2681 					mesh_da, sdata->vif.addr);
2682 			if (is_multicast_ether_addr(mesh_da))
2683 				/* DA TA mSA AE:SA */
2684 				meshhdrlen = ieee80211_new_mesh_header(
2685 						sdata, &mesh_hdr,
2686 						skb->data + ETH_ALEN, NULL);
2687 			else
2688 				/* RA TA mDA mSA AE:DA SA */
2689 				meshhdrlen = ieee80211_new_mesh_header(
2690 						sdata, &mesh_hdr, skb->data,
2691 						skb->data + ETH_ALEN);
2692 
2693 		}
2694 		chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2695 		if (!chanctx_conf) {
2696 			ret = -ENOTCONN;
2697 			goto free;
2698 		}
2699 		band = chanctx_conf->def.chan->band;
2700 
2701 		/* For injected frames, fill RA right away as nexthop lookup
2702 		 * will be skipped.
2703 		 */
2704 		if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) &&
2705 		    is_zero_ether_addr(hdr.addr1))
2706 			memcpy(hdr.addr1, skb->data, ETH_ALEN);
2707 		break;
2708 #endif
2709 	case NL80211_IFTYPE_STATION:
2710 		/* we already did checks when looking up the RA STA */
2711 		tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2712 
2713 		if (tdls_peer) {
2714 			/* DA SA BSSID */
2715 			memcpy(hdr.addr1, skb->data, ETH_ALEN);
2716 			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2717 			memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2718 			hdrlen = 24;
2719 		}  else if (sdata->u.mgd.use_4addr &&
2720 			    cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2721 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2722 					  IEEE80211_FCTL_TODS);
2723 			/* RA TA DA SA */
2724 			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2725 			memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2726 			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2727 			memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2728 			hdrlen = 30;
2729 		} else {
2730 			fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2731 			/* BSSID SA DA */
2732 			memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2733 			memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2734 			memcpy(hdr.addr3, skb->data, ETH_ALEN);
2735 			hdrlen = 24;
2736 		}
2737 		chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2738 		if (!chanctx_conf) {
2739 			ret = -ENOTCONN;
2740 			goto free;
2741 		}
2742 		band = chanctx_conf->def.chan->band;
2743 		break;
2744 	case NL80211_IFTYPE_OCB:
2745 		/* DA SA BSSID */
2746 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2747 		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2748 		eth_broadcast_addr(hdr.addr3);
2749 		hdrlen = 24;
2750 		chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2751 		if (!chanctx_conf) {
2752 			ret = -ENOTCONN;
2753 			goto free;
2754 		}
2755 		band = chanctx_conf->def.chan->band;
2756 		break;
2757 	case NL80211_IFTYPE_ADHOC:
2758 		/* DA SA BSSID */
2759 		memcpy(hdr.addr1, skb->data, ETH_ALEN);
2760 		memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2761 		memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2762 		hdrlen = 24;
2763 		chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2764 		if (!chanctx_conf) {
2765 			ret = -ENOTCONN;
2766 			goto free;
2767 		}
2768 		band = chanctx_conf->def.chan->band;
2769 		break;
2770 	default:
2771 		ret = -EINVAL;
2772 		goto free;
2773 	}
2774 
2775 	multicast = is_multicast_ether_addr(hdr.addr1);
2776 
2777 	/* sta is always NULL for mesh */
2778 	if (sta) {
2779 		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2780 		wme_sta = sta->sta.wme;
2781 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2782 		/* For mesh, the use of the QoS header is mandatory */
2783 		wme_sta = true;
2784 	}
2785 
2786 	/* receiver does QoS (which also means we do) use it */
2787 	if (wme_sta) {
2788 		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2789 		hdrlen += 2;
2790 	}
2791 
2792 	/*
2793 	 * Drop unicast frames to unauthorised stations unless they are
2794 	 * EAPOL frames from the local station.
2795 	 */
2796 	if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2797 		     (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2798 		     !multicast && !authorized &&
2799 		     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2800 		      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2801 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2802 		net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2803 				    sdata->name, hdr.addr1);
2804 #endif
2805 
2806 		I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2807 
2808 		ret = -EPERM;
2809 		goto free;
2810 	}
2811 
2812 	if (unlikely(!multicast && ((skb->sk &&
2813 		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) ||
2814 		     ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS)))
2815 		info_id = ieee80211_store_ack_skb(local, skb, &info_flags,
2816 						  cookie);
2817 
2818 	/*
2819 	 * If the skb is shared we need to obtain our own copy.
2820 	 */
2821 	skb = skb_share_check(skb, GFP_ATOMIC);
2822 	if (unlikely(!skb)) {
2823 		ret = -ENOMEM;
2824 		goto free;
2825 	}
2826 
2827 	hdr.frame_control = fc;
2828 	hdr.duration_id = 0;
2829 	hdr.seq_ctrl = 0;
2830 
2831 	skip_header_bytes = ETH_HLEN;
2832 	if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2833 		encaps_data = bridge_tunnel_header;
2834 		encaps_len = sizeof(bridge_tunnel_header);
2835 		skip_header_bytes -= 2;
2836 	} else if (ethertype >= ETH_P_802_3_MIN) {
2837 		encaps_data = rfc1042_header;
2838 		encaps_len = sizeof(rfc1042_header);
2839 		skip_header_bytes -= 2;
2840 	} else {
2841 		encaps_data = NULL;
2842 		encaps_len = 0;
2843 	}
2844 
2845 	skb_pull(skb, skip_header_bytes);
2846 	head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2847 
2848 	/*
2849 	 * So we need to modify the skb header and hence need a copy of
2850 	 * that. The head_need variable above doesn't, so far, include
2851 	 * the needed header space that we don't need right away. If we
2852 	 * can, then we don't reallocate right now but only after the
2853 	 * frame arrives at the master device (if it does...)
2854 	 *
2855 	 * If we cannot, however, then we will reallocate to include all
2856 	 * the ever needed space. Also, if we need to reallocate it anyway,
2857 	 * make it big enough for everything we may ever need.
2858 	 */
2859 
2860 	if (head_need > 0 || skb_cloned(skb)) {
2861 		head_need += sdata->encrypt_headroom;
2862 		head_need += local->tx_headroom;
2863 		head_need = max_t(int, 0, head_need);
2864 		if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) {
2865 			ieee80211_free_txskb(&local->hw, skb);
2866 			skb = NULL;
2867 			return ERR_PTR(-ENOMEM);
2868 		}
2869 	}
2870 
2871 	if (encaps_data)
2872 		memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2873 
2874 #ifdef CONFIG_MAC80211_MESH
2875 	if (meshhdrlen > 0)
2876 		memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2877 #endif
2878 
2879 	if (ieee80211_is_data_qos(fc)) {
2880 		__le16 *qos_control;
2881 
2882 		qos_control = skb_push(skb, 2);
2883 		memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2884 		/*
2885 		 * Maybe we could actually set some fields here, for now just
2886 		 * initialise to zero to indicate no special operation.
2887 		 */
2888 		*qos_control = 0;
2889 	} else
2890 		memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2891 
2892 	skb_reset_mac_header(skb);
2893 
2894 	info = IEEE80211_SKB_CB(skb);
2895 	memset(info, 0, sizeof(*info));
2896 
2897 	info->flags = info_flags;
2898 	info->ack_frame_id = info_id;
2899 	info->band = band;
2900 	info->control.flags = ctrl_flags;
2901 
2902 	return skb;
2903  free:
2904 	kfree_skb(skb);
2905 	return ERR_PTR(ret);
2906 }
2907 
2908 /*
2909  * fast-xmit overview
2910  *
2911  * The core idea of this fast-xmit is to remove per-packet checks by checking
2912  * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2913  * checks that are needed to get the sta->fast_tx pointer assigned, after which
2914  * much less work can be done per packet. For example, fragmentation must be
2915  * disabled or the fast_tx pointer will not be set. All the conditions are seen
2916  * in the code here.
2917  *
2918  * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2919  * header and other data to aid packet processing in ieee80211_xmit_fast().
2920  *
2921  * The most difficult part of this is that when any of these assumptions
2922  * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2923  * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2924  * since the per-packet code no longer checks the conditions. This is reflected
2925  * by the calls to these functions throughout the rest of the code, and must be
2926  * maintained if any of the TX path checks change.
2927  */
2928 
ieee80211_check_fast_xmit(struct sta_info * sta)2929 void ieee80211_check_fast_xmit(struct sta_info *sta)
2930 {
2931 	struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2932 	struct ieee80211_local *local = sta->local;
2933 	struct ieee80211_sub_if_data *sdata = sta->sdata;
2934 	struct ieee80211_hdr *hdr = (void *)build.hdr;
2935 	struct ieee80211_chanctx_conf *chanctx_conf;
2936 	__le16 fc;
2937 
2938 	if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2939 		return;
2940 
2941 	/* Locking here protects both the pointer itself, and against concurrent
2942 	 * invocations winning data access races to, e.g., the key pointer that
2943 	 * is used.
2944 	 * Without it, the invocation of this function right after the key
2945 	 * pointer changes wouldn't be sufficient, as another CPU could access
2946 	 * the pointer, then stall, and then do the cache update after the CPU
2947 	 * that invalidated the key.
2948 	 * With the locking, such scenarios cannot happen as the check for the
2949 	 * key and the fast-tx assignment are done atomically, so the CPU that
2950 	 * modifies the key will either wait or other one will see the key
2951 	 * cleared/changed already.
2952 	 */
2953 	spin_lock_bh(&sta->lock);
2954 	if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2955 	    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2956 	    sdata->vif.type == NL80211_IFTYPE_STATION)
2957 		goto out;
2958 
2959 	if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2960 		goto out;
2961 
2962 	if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2963 	    test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2964 	    test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2965 	    test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2966 		goto out;
2967 
2968 	if (sdata->noack_map)
2969 		goto out;
2970 
2971 	/* fast-xmit doesn't handle fragmentation at all */
2972 	if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2973 	    !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2974 		goto out;
2975 
2976 	rcu_read_lock();
2977 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2978 	if (!chanctx_conf) {
2979 		rcu_read_unlock();
2980 		goto out;
2981 	}
2982 	build.band = chanctx_conf->def.chan->band;
2983 	rcu_read_unlock();
2984 
2985 	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2986 
2987 	switch (sdata->vif.type) {
2988 	case NL80211_IFTYPE_ADHOC:
2989 		/* DA SA BSSID */
2990 		build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2991 		build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2992 		memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2993 		build.hdr_len = 24;
2994 		break;
2995 	case NL80211_IFTYPE_STATION:
2996 		if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2997 			/* DA SA BSSID */
2998 			build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2999 			build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3000 			memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
3001 			build.hdr_len = 24;
3002 			break;
3003 		}
3004 
3005 		if (sdata->u.mgd.use_4addr) {
3006 			/* non-regular ethertype cannot use the fastpath */
3007 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
3008 					  IEEE80211_FCTL_TODS);
3009 			/* RA TA DA SA */
3010 			memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
3011 			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3012 			build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3013 			build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3014 			build.hdr_len = 30;
3015 			break;
3016 		}
3017 		fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
3018 		/* BSSID SA DA */
3019 		memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
3020 		build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3021 		build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3022 		build.hdr_len = 24;
3023 		break;
3024 	case NL80211_IFTYPE_AP_VLAN:
3025 		if (sdata->wdev.use_4addr) {
3026 			fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
3027 					  IEEE80211_FCTL_TODS);
3028 			/* RA TA DA SA */
3029 			memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
3030 			memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3031 			build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3032 			build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3033 			build.hdr_len = 30;
3034 			break;
3035 		}
3036 		fallthrough;
3037 	case NL80211_IFTYPE_AP:
3038 		fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
3039 		/* DA BSSID SA */
3040 		build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3041 		memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3042 		build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3043 		build.hdr_len = 24;
3044 		break;
3045 	default:
3046 		/* not handled on fast-xmit */
3047 		goto out;
3048 	}
3049 
3050 	if (sta->sta.wme) {
3051 		build.hdr_len += 2;
3052 		fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
3053 	}
3054 
3055 	/* We store the key here so there's no point in using rcu_dereference()
3056 	 * but that's fine because the code that changes the pointers will call
3057 	 * this function after doing so. For a single CPU that would be enough,
3058 	 * for multiple see the comment above.
3059 	 */
3060 	build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
3061 	if (!build.key)
3062 		build.key = rcu_access_pointer(sdata->default_unicast_key);
3063 	if (build.key) {
3064 		bool gen_iv, iv_spc, mmic;
3065 
3066 		gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
3067 		iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
3068 		mmic = build.key->conf.flags &
3069 			(IEEE80211_KEY_FLAG_GENERATE_MMIC |
3070 			 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
3071 
3072 		/* don't handle software crypto */
3073 		if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
3074 			goto out;
3075 
3076 		/* Key is being removed */
3077 		if (build.key->flags & KEY_FLAG_TAINTED)
3078 			goto out;
3079 
3080 		switch (build.key->conf.cipher) {
3081 		case WLAN_CIPHER_SUITE_CCMP:
3082 		case WLAN_CIPHER_SUITE_CCMP_256:
3083 			if (gen_iv)
3084 				build.pn_offs = build.hdr_len;
3085 			if (gen_iv || iv_spc)
3086 				build.hdr_len += IEEE80211_CCMP_HDR_LEN;
3087 			break;
3088 		case WLAN_CIPHER_SUITE_GCMP:
3089 		case WLAN_CIPHER_SUITE_GCMP_256:
3090 			if (gen_iv)
3091 				build.pn_offs = build.hdr_len;
3092 			if (gen_iv || iv_spc)
3093 				build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3094 			break;
3095 		case WLAN_CIPHER_SUITE_TKIP:
3096 			/* cannot handle MMIC or IV generation in xmit-fast */
3097 			if (mmic || gen_iv)
3098 				goto out;
3099 			if (iv_spc)
3100 				build.hdr_len += IEEE80211_TKIP_IV_LEN;
3101 			break;
3102 		case WLAN_CIPHER_SUITE_WEP40:
3103 		case WLAN_CIPHER_SUITE_WEP104:
3104 			/* cannot handle IV generation in fast-xmit */
3105 			if (gen_iv)
3106 				goto out;
3107 			if (iv_spc)
3108 				build.hdr_len += IEEE80211_WEP_IV_LEN;
3109 			break;
3110 		case WLAN_CIPHER_SUITE_AES_CMAC:
3111 		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3112 		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3113 		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3114 			WARN(1,
3115 			     "management cipher suite 0x%x enabled for data\n",
3116 			     build.key->conf.cipher);
3117 			goto out;
3118 		default:
3119 			/* we don't know how to generate IVs for this at all */
3120 			if (WARN_ON(gen_iv))
3121 				goto out;
3122 			/* pure hardware keys are OK, of course */
3123 			if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
3124 				break;
3125 			/* cipher scheme might require space allocation */
3126 			if (iv_spc &&
3127 			    build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
3128 				goto out;
3129 			if (iv_spc)
3130 				build.hdr_len += build.key->conf.iv_len;
3131 		}
3132 
3133 		fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3134 	}
3135 
3136 	hdr->frame_control = fc;
3137 
3138 	memcpy(build.hdr + build.hdr_len,
3139 	       rfc1042_header,  sizeof(rfc1042_header));
3140 	build.hdr_len += sizeof(rfc1042_header);
3141 
3142 	fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3143 	/* if the kmemdup fails, continue w/o fast_tx */
3144 
3145  out:
3146 	/* we might have raced against another call to this function */
3147 	old = rcu_dereference_protected(sta->fast_tx,
3148 					lockdep_is_held(&sta->lock));
3149 	rcu_assign_pointer(sta->fast_tx, fast_tx);
3150 	if (old)
3151 		kfree_rcu(old, rcu_head);
3152 	spin_unlock_bh(&sta->lock);
3153 }
3154 
ieee80211_check_fast_xmit_all(struct ieee80211_local * local)3155 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3156 {
3157 	struct sta_info *sta;
3158 
3159 	rcu_read_lock();
3160 	list_for_each_entry_rcu(sta, &local->sta_list, list)
3161 		ieee80211_check_fast_xmit(sta);
3162 	rcu_read_unlock();
3163 }
3164 
ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data * sdata)3165 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3166 {
3167 	struct ieee80211_local *local = sdata->local;
3168 	struct sta_info *sta;
3169 
3170 	rcu_read_lock();
3171 
3172 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
3173 		if (sdata != sta->sdata &&
3174 		    (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3175 			continue;
3176 		ieee80211_check_fast_xmit(sta);
3177 	}
3178 
3179 	rcu_read_unlock();
3180 }
3181 
ieee80211_clear_fast_xmit(struct sta_info * sta)3182 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3183 {
3184 	struct ieee80211_fast_tx *fast_tx;
3185 
3186 	spin_lock_bh(&sta->lock);
3187 	fast_tx = rcu_dereference_protected(sta->fast_tx,
3188 					    lockdep_is_held(&sta->lock));
3189 	RCU_INIT_POINTER(sta->fast_tx, NULL);
3190 	spin_unlock_bh(&sta->lock);
3191 
3192 	if (fast_tx)
3193 		kfree_rcu(fast_tx, rcu_head);
3194 }
3195 
ieee80211_amsdu_realloc_pad(struct ieee80211_local * local,struct sk_buff * skb,int headroom)3196 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3197 					struct sk_buff *skb, int headroom)
3198 {
3199 	if (skb_headroom(skb) < headroom) {
3200 		I802_DEBUG_INC(local->tx_expand_skb_head);
3201 
3202 		if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3203 			wiphy_debug(local->hw.wiphy,
3204 				    "failed to reallocate TX buffer\n");
3205 			return false;
3206 		}
3207 	}
3208 
3209 	return true;
3210 }
3211 
ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data * sdata,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3212 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3213 					 struct ieee80211_fast_tx *fast_tx,
3214 					 struct sk_buff *skb)
3215 {
3216 	struct ieee80211_local *local = sdata->local;
3217 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3218 	struct ieee80211_hdr *hdr;
3219 	struct ethhdr *amsdu_hdr;
3220 	int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3221 	int subframe_len = skb->len - hdr_len;
3222 	void *data;
3223 	u8 *qc, *h_80211_src, *h_80211_dst;
3224 	const u8 *bssid;
3225 
3226 	if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3227 		return false;
3228 
3229 	if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3230 		return true;
3231 
3232 	if (!ieee80211_amsdu_realloc_pad(local, skb,
3233 					 sizeof(*amsdu_hdr) +
3234 					 local->hw.extra_tx_headroom))
3235 		return false;
3236 
3237 	data = skb_push(skb, sizeof(*amsdu_hdr));
3238 	memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3239 	hdr = data;
3240 	amsdu_hdr = data + hdr_len;
3241 	/* h_80211_src/dst is addr* field within hdr */
3242 	h_80211_src = data + fast_tx->sa_offs;
3243 	h_80211_dst = data + fast_tx->da_offs;
3244 
3245 	amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3246 	ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3247 	ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3248 
3249 	/* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3250 	 * fields needs to be changed to BSSID for A-MSDU frames depending
3251 	 * on FromDS/ToDS values.
3252 	 */
3253 	switch (sdata->vif.type) {
3254 	case NL80211_IFTYPE_STATION:
3255 		bssid = sdata->u.mgd.bssid;
3256 		break;
3257 	case NL80211_IFTYPE_AP:
3258 	case NL80211_IFTYPE_AP_VLAN:
3259 		bssid = sdata->vif.addr;
3260 		break;
3261 	default:
3262 		bssid = NULL;
3263 	}
3264 
3265 	if (bssid && ieee80211_has_fromds(hdr->frame_control))
3266 		ether_addr_copy(h_80211_src, bssid);
3267 
3268 	if (bssid && ieee80211_has_tods(hdr->frame_control))
3269 		ether_addr_copy(h_80211_dst, bssid);
3270 
3271 	qc = ieee80211_get_qos_ctl(hdr);
3272 	*qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3273 
3274 	info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3275 
3276 	return true;
3277 }
3278 
ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3279 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3280 				      struct sta_info *sta,
3281 				      struct ieee80211_fast_tx *fast_tx,
3282 				      struct sk_buff *skb)
3283 {
3284 	struct ieee80211_local *local = sdata->local;
3285 	struct fq *fq = &local->fq;
3286 	struct fq_tin *tin;
3287 	struct fq_flow *flow;
3288 	u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3289 	struct ieee80211_txq *txq = sta->sta.txq[tid];
3290 	struct txq_info *txqi;
3291 	struct sk_buff **frag_tail, *head;
3292 	int subframe_len = skb->len - ETH_ALEN;
3293 	u8 max_subframes = sta->sta.max_amsdu_subframes;
3294 	int max_frags = local->hw.max_tx_fragments;
3295 	int max_amsdu_len = sta->sta.max_amsdu_len;
3296 	int orig_truesize;
3297 	u32 flow_idx;
3298 	__be16 len;
3299 	void *data;
3300 	bool ret = false;
3301 	unsigned int orig_len;
3302 	int n = 2, nfrags, pad = 0;
3303 	u16 hdrlen;
3304 
3305 	if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3306 		return false;
3307 
3308 	if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED)
3309 		return false;
3310 
3311 	if (skb_is_gso(skb))
3312 		return false;
3313 
3314 	if (!txq)
3315 		return false;
3316 
3317 	txqi = to_txq_info(txq);
3318 	if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3319 		return false;
3320 
3321 	if (sta->sta.max_rc_amsdu_len)
3322 		max_amsdu_len = min_t(int, max_amsdu_len,
3323 				      sta->sta.max_rc_amsdu_len);
3324 
3325 	if (sta->sta.max_tid_amsdu_len[tid])
3326 		max_amsdu_len = min_t(int, max_amsdu_len,
3327 				      sta->sta.max_tid_amsdu_len[tid]);
3328 
3329 	flow_idx = fq_flow_idx(fq, skb);
3330 
3331 	spin_lock_bh(&fq->lock);
3332 
3333 	/* TODO: Ideally aggregation should be done on dequeue to remain
3334 	 * responsive to environment changes.
3335 	 */
3336 
3337 	tin = &txqi->tin;
3338 	flow = fq_flow_classify(fq, tin, flow_idx, skb);
3339 	head = skb_peek_tail(&flow->queue);
3340 	if (!head || skb_is_gso(head))
3341 		goto out;
3342 
3343 	orig_truesize = head->truesize;
3344 	orig_len = head->len;
3345 
3346 	if (skb->len + head->len > max_amsdu_len)
3347 		goto out;
3348 
3349 	nfrags = 1 + skb_shinfo(skb)->nr_frags;
3350 	nfrags += 1 + skb_shinfo(head)->nr_frags;
3351 	frag_tail = &skb_shinfo(head)->frag_list;
3352 	while (*frag_tail) {
3353 		nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3354 		frag_tail = &(*frag_tail)->next;
3355 		n++;
3356 	}
3357 
3358 	if (max_subframes && n > max_subframes)
3359 		goto out;
3360 
3361 	if (max_frags && nfrags > max_frags)
3362 		goto out;
3363 
3364 	if (!drv_can_aggregate_in_amsdu(local, head, skb))
3365 		goto out;
3366 
3367 	if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3368 		goto out;
3369 
3370 	/* If n == 2, the "while (*frag_tail)" loop above didn't execute
3371 	 * and  frag_tail should be &skb_shinfo(head)->frag_list.
3372 	 * However, ieee80211_amsdu_prepare_head() can reallocate it.
3373 	 * Reload frag_tail to have it pointing to the correct place.
3374 	 */
3375 	if (n == 2)
3376 		frag_tail = &skb_shinfo(head)->frag_list;
3377 
3378 	/*
3379 	 * Pad out the previous subframe to a multiple of 4 by adding the
3380 	 * padding to the next one, that's being added. Note that head->len
3381 	 * is the length of the full A-MSDU, but that works since each time
3382 	 * we add a new subframe we pad out the previous one to a multiple
3383 	 * of 4 and thus it no longer matters in the next round.
3384 	 */
3385 	hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3386 	if ((head->len - hdrlen) & 3)
3387 		pad = 4 - ((head->len - hdrlen) & 3);
3388 
3389 	if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3390 						     2 + pad))
3391 		goto out_recalc;
3392 
3393 	ret = true;
3394 	data = skb_push(skb, ETH_ALEN + 2);
3395 	memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3396 
3397 	data += 2 * ETH_ALEN;
3398 	len = cpu_to_be16(subframe_len);
3399 	memcpy(data, &len, 2);
3400 	memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3401 
3402 	memset(skb_push(skb, pad), 0, pad);
3403 
3404 	head->len += skb->len;
3405 	head->data_len += skb->len;
3406 	*frag_tail = skb;
3407 
3408 out_recalc:
3409 	fq->memory_usage += head->truesize - orig_truesize;
3410 	if (head->len != orig_len) {
3411 		flow->backlog += head->len - orig_len;
3412 		tin->backlog_bytes += head->len - orig_len;
3413 	}
3414 out:
3415 	spin_unlock_bh(&fq->lock);
3416 
3417 	return ret;
3418 }
3419 
3420 /*
3421  * Can be called while the sta lock is held. Anything that can cause packets to
3422  * be generated will cause deadlock!
3423  */
3424 static ieee80211_tx_result
ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,u8 pn_offs,struct ieee80211_key * key,struct ieee80211_tx_data * tx)3425 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3426 			   struct sta_info *sta, u8 pn_offs,
3427 			   struct ieee80211_key *key,
3428 			   struct ieee80211_tx_data *tx)
3429 {
3430 	struct sk_buff *skb = tx->skb;
3431 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3432 	struct ieee80211_hdr *hdr = (void *)skb->data;
3433 	u8 tid = IEEE80211_NUM_TIDS;
3434 
3435 	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) &&
3436 	    ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE)
3437 		return TX_DROP;
3438 
3439 	if (key)
3440 		info->control.hw_key = &key->conf;
3441 
3442 	dev_sw_netstats_tx_add(skb->dev, 1, skb->len);
3443 
3444 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3445 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3446 		hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3447 	} else {
3448 		info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3449 		hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3450 		sdata->sequence_number += 0x10;
3451 	}
3452 
3453 	if (skb_shinfo(skb)->gso_size)
3454 		sta->deflink.tx_stats.msdu[tid] +=
3455 			DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3456 	else
3457 		sta->deflink.tx_stats.msdu[tid]++;
3458 
3459 	info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3460 
3461 	/* statistics normally done by ieee80211_tx_h_stats (but that
3462 	 * has to consider fragmentation, so is more complex)
3463 	 */
3464 	sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3465 	sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++;
3466 
3467 	if (pn_offs) {
3468 		u64 pn;
3469 		u8 *crypto_hdr = skb->data + pn_offs;
3470 
3471 		switch (key->conf.cipher) {
3472 		case WLAN_CIPHER_SUITE_CCMP:
3473 		case WLAN_CIPHER_SUITE_CCMP_256:
3474 		case WLAN_CIPHER_SUITE_GCMP:
3475 		case WLAN_CIPHER_SUITE_GCMP_256:
3476 			pn = atomic64_inc_return(&key->conf.tx_pn);
3477 			crypto_hdr[0] = pn;
3478 			crypto_hdr[1] = pn >> 8;
3479 			crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6);
3480 			crypto_hdr[4] = pn >> 16;
3481 			crypto_hdr[5] = pn >> 24;
3482 			crypto_hdr[6] = pn >> 32;
3483 			crypto_hdr[7] = pn >> 40;
3484 			break;
3485 		}
3486 	}
3487 
3488 	return TX_CONTINUE;
3489 }
3490 
ieee80211_xmit_fast(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3491 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3492 				struct sta_info *sta,
3493 				struct ieee80211_fast_tx *fast_tx,
3494 				struct sk_buff *skb)
3495 {
3496 	struct ieee80211_local *local = sdata->local;
3497 	u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3498 	int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3499 	int hw_headroom = sdata->local->hw.extra_tx_headroom;
3500 	struct ethhdr eth;
3501 	struct ieee80211_tx_info *info;
3502 	struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3503 	struct ieee80211_tx_data tx;
3504 	ieee80211_tx_result r;
3505 	struct tid_ampdu_tx *tid_tx = NULL;
3506 	u8 tid = IEEE80211_NUM_TIDS;
3507 
3508 	/* control port protocol needs a lot of special handling */
3509 	if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3510 		return false;
3511 
3512 	/* only RFC 1042 SNAP */
3513 	if (ethertype < ETH_P_802_3_MIN)
3514 		return false;
3515 
3516 	/* don't handle TX status request here either */
3517 	if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3518 		return false;
3519 
3520 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3521 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3522 		tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3523 		if (tid_tx) {
3524 			if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3525 				return false;
3526 			if (tid_tx->timeout)
3527 				tid_tx->last_tx = jiffies;
3528 		}
3529 	}
3530 
3531 	/* after this point (skb is modified) we cannot return false */
3532 
3533 	skb = skb_share_check(skb, GFP_ATOMIC);
3534 	if (unlikely(!skb))
3535 		return true;
3536 
3537 	if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3538 	    ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3539 		return true;
3540 
3541 	/* will not be crypto-handled beyond what we do here, so use false
3542 	 * as the may-encrypt argument for the resize to not account for
3543 	 * more room than we already have in 'extra_head'
3544 	 */
3545 	if (unlikely(ieee80211_skb_resize(sdata, skb,
3546 					  max_t(int, extra_head + hw_headroom -
3547 						     skb_headroom(skb), 0),
3548 					  ENCRYPT_NO))) {
3549 		kfree_skb(skb);
3550 		return true;
3551 	}
3552 
3553 	memcpy(&eth, skb->data, ETH_HLEN - 2);
3554 	hdr = skb_push(skb, extra_head);
3555 	memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3556 	memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3557 	memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3558 
3559 	info = IEEE80211_SKB_CB(skb);
3560 	memset(info, 0, sizeof(*info));
3561 	info->band = fast_tx->band;
3562 	info->control.vif = &sdata->vif;
3563 	info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3564 		      IEEE80211_TX_CTL_DONTFRAG |
3565 		      (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3566 	info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3567 
3568 #ifdef CONFIG_MAC80211_DEBUGFS
3569 	if (local->force_tx_status)
3570 		info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
3571 #endif
3572 
3573 	if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3574 		tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3575 		*ieee80211_get_qos_ctl(hdr) = tid;
3576 	}
3577 
3578 	__skb_queue_head_init(&tx.skbs);
3579 
3580 	tx.flags = IEEE80211_TX_UNICAST;
3581 	tx.local = local;
3582 	tx.sdata = sdata;
3583 	tx.sta = sta;
3584 	tx.key = fast_tx->key;
3585 
3586 	if (ieee80211_queue_skb(local, sdata, sta, skb))
3587 		return true;
3588 
3589 	tx.skb = skb;
3590 	r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3591 				       fast_tx->key, &tx);
3592 	tx.skb = NULL;
3593 	if (r == TX_DROP) {
3594 		kfree_skb(skb);
3595 		return true;
3596 	}
3597 
3598 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3599 		sdata = container_of(sdata->bss,
3600 				     struct ieee80211_sub_if_data, u.ap);
3601 
3602 	__skb_queue_tail(&tx.skbs, skb);
3603 	ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false);
3604 	return true;
3605 }
3606 
ieee80211_tx_dequeue(struct ieee80211_hw * hw,struct ieee80211_txq * txq)3607 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3608 				     struct ieee80211_txq *txq)
3609 {
3610 	struct ieee80211_local *local = hw_to_local(hw);
3611 	struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3612 	struct ieee80211_hdr *hdr;
3613 	struct sk_buff *skb = NULL;
3614 	struct fq *fq = &local->fq;
3615 	struct fq_tin *tin = &txqi->tin;
3616 	struct ieee80211_tx_info *info;
3617 	struct ieee80211_tx_data tx;
3618 	ieee80211_tx_result r;
3619 	struct ieee80211_vif *vif = txq->vif;
3620 
3621 	WARN_ON_ONCE(softirq_count() == 0);
3622 
3623 	if (!ieee80211_txq_airtime_check(hw, txq))
3624 		return NULL;
3625 
3626 begin:
3627 	spin_lock_bh(&fq->lock);
3628 
3629 	if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ||
3630 	    test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags))
3631 		goto out;
3632 
3633 	if (vif->txqs_stopped[txq->ac]) {
3634 		set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags);
3635 		goto out;
3636 	}
3637 
3638 	/* Make sure fragments stay together. */
3639 	skb = __skb_dequeue(&txqi->frags);
3640 	if (unlikely(skb)) {
3641 		if (!(IEEE80211_SKB_CB(skb)->control.flags &
3642 				IEEE80211_TX_INTCFL_NEED_TXPROCESSING))
3643 			goto out;
3644 		IEEE80211_SKB_CB(skb)->control.flags &=
3645 			~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
3646 	} else {
3647 		skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3648 	}
3649 
3650 	if (!skb)
3651 		goto out;
3652 
3653 	spin_unlock_bh(&fq->lock);
3654 
3655 	hdr = (struct ieee80211_hdr *)skb->data;
3656 	info = IEEE80211_SKB_CB(skb);
3657 
3658 	memset(&tx, 0, sizeof(tx));
3659 	__skb_queue_head_init(&tx.skbs);
3660 	tx.local = local;
3661 	tx.skb = skb;
3662 	tx.sdata = vif_to_sdata(info->control.vif);
3663 
3664 	if (txq->sta) {
3665 		tx.sta = container_of(txq->sta, struct sta_info, sta);
3666 		/*
3667 		 * Drop unicast frames to unauthorised stations unless they are
3668 		 * injected frames or EAPOL frames from the local station.
3669 		 */
3670 		if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
3671 			     ieee80211_is_data(hdr->frame_control) &&
3672 			     !ieee80211_vif_is_mesh(&tx.sdata->vif) &&
3673 			     tx.sdata->vif.type != NL80211_IFTYPE_OCB &&
3674 			     !is_multicast_ether_addr(hdr->addr1) &&
3675 			     !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) &&
3676 			     (!(info->control.flags &
3677 				IEEE80211_TX_CTRL_PORT_CTRL_PROTO) ||
3678 			      !ether_addr_equal(tx.sdata->vif.addr,
3679 						hdr->addr2)))) {
3680 			I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
3681 			ieee80211_free_txskb(&local->hw, skb);
3682 			goto begin;
3683 		}
3684 	}
3685 
3686 	/*
3687 	 * The key can be removed while the packet was queued, so need to call
3688 	 * this here to get the current key.
3689 	 */
3690 	r = ieee80211_tx_h_select_key(&tx);
3691 	if (r != TX_CONTINUE) {
3692 		ieee80211_free_txskb(&local->hw, skb);
3693 		goto begin;
3694 	}
3695 
3696 	if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3697 		info->flags |= IEEE80211_TX_CTL_AMPDU;
3698 	else
3699 		info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3700 
3701 	if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
3702 		if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3703 			r = ieee80211_tx_h_rate_ctrl(&tx);
3704 			if (r != TX_CONTINUE) {
3705 				ieee80211_free_txskb(&local->hw, skb);
3706 				goto begin;
3707 			}
3708 		}
3709 		goto encap_out;
3710 	}
3711 
3712 	if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3713 		struct sta_info *sta = container_of(txq->sta, struct sta_info,
3714 						    sta);
3715 		u8 pn_offs = 0;
3716 
3717 		if (tx.key &&
3718 		    (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3719 			pn_offs = ieee80211_hdrlen(hdr->frame_control);
3720 
3721 		r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3722 					       tx.key, &tx);
3723 		if (r != TX_CONTINUE) {
3724 			ieee80211_free_txskb(&local->hw, skb);
3725 			goto begin;
3726 		}
3727 	} else {
3728 		if (invoke_tx_handlers_late(&tx))
3729 			goto begin;
3730 
3731 		skb = __skb_dequeue(&tx.skbs);
3732 
3733 		if (!skb_queue_empty(&tx.skbs)) {
3734 			spin_lock_bh(&fq->lock);
3735 			skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3736 			spin_unlock_bh(&fq->lock);
3737 		}
3738 	}
3739 
3740 	if (skb_has_frag_list(skb) &&
3741 	    !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3742 		if (skb_linearize(skb)) {
3743 			ieee80211_free_txskb(&local->hw, skb);
3744 			goto begin;
3745 		}
3746 	}
3747 
3748 	switch (tx.sdata->vif.type) {
3749 	case NL80211_IFTYPE_MONITOR:
3750 		if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3751 			vif = &tx.sdata->vif;
3752 			break;
3753 		}
3754 		tx.sdata = rcu_dereference(local->monitor_sdata);
3755 		if (tx.sdata) {
3756 			vif = &tx.sdata->vif;
3757 			info->hw_queue =
3758 				vif->hw_queue[skb_get_queue_mapping(skb)];
3759 		} else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3760 			ieee80211_free_txskb(&local->hw, skb);
3761 			goto begin;
3762 		} else {
3763 			vif = NULL;
3764 		}
3765 		break;
3766 	case NL80211_IFTYPE_AP_VLAN:
3767 		tx.sdata = container_of(tx.sdata->bss,
3768 					struct ieee80211_sub_if_data, u.ap);
3769 		fallthrough;
3770 	default:
3771 		vif = &tx.sdata->vif;
3772 		break;
3773 	}
3774 
3775 encap_out:
3776 	IEEE80211_SKB_CB(skb)->control.vif = vif;
3777 
3778 	if (vif &&
3779 	    wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) {
3780 		bool ampdu = txq->ac != IEEE80211_AC_VO;
3781 		u32 airtime;
3782 
3783 		airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta,
3784 							     skb->len, ampdu);
3785 		if (airtime) {
3786 			airtime = ieee80211_info_set_tx_time_est(info, airtime);
3787 			ieee80211_sta_update_pending_airtime(local, tx.sta,
3788 							     txq->ac,
3789 							     airtime,
3790 							     false);
3791 		}
3792 	}
3793 
3794 	return skb;
3795 
3796 out:
3797 	spin_unlock_bh(&fq->lock);
3798 
3799 	return skb;
3800 }
3801 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3802 
ieee80211_next_txq(struct ieee80211_hw * hw,u8 ac)3803 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
3804 {
3805 	struct ieee80211_local *local = hw_to_local(hw);
3806 	struct airtime_sched_info *air_sched;
3807 	u64 now = ktime_get_coarse_boottime_ns();
3808 	struct ieee80211_txq *ret = NULL;
3809 	struct airtime_info *air_info;
3810 	struct txq_info *txqi = NULL;
3811 	struct rb_node *node;
3812 	bool first = false;
3813 
3814 	air_sched = &local->airtime[ac];
3815 	spin_lock_bh(&air_sched->lock);
3816 
3817 	node = air_sched->schedule_pos;
3818 
3819 begin:
3820 	if (!node) {
3821 		node = rb_first_cached(&air_sched->active_txqs);
3822 		first = true;
3823 	} else {
3824 		node = rb_next(node);
3825 	}
3826 
3827 	if (!node)
3828 		goto out;
3829 
3830 	txqi = container_of(node, struct txq_info, schedule_order);
3831 	air_info = to_airtime_info(&txqi->txq);
3832 
3833 	if (air_info->v_t > air_sched->v_t &&
3834 	    (!first || !airtime_catchup_v_t(air_sched, air_info->v_t, now)))
3835 		goto out;
3836 
3837 	if (!ieee80211_txq_airtime_check(hw, &txqi->txq)) {
3838 		first = false;
3839 		goto begin;
3840 	}
3841 
3842 	air_sched->schedule_pos = node;
3843 	air_sched->last_schedule_activity = now;
3844 	ret = &txqi->txq;
3845 out:
3846 	spin_unlock_bh(&air_sched->lock);
3847 	return ret;
3848 }
3849 EXPORT_SYMBOL(ieee80211_next_txq);
3850 
__ieee80211_insert_txq(struct rb_root_cached * root,struct txq_info * txqi)3851 static void __ieee80211_insert_txq(struct rb_root_cached *root,
3852 				   struct txq_info *txqi)
3853 {
3854 	struct rb_node **new = &root->rb_root.rb_node;
3855 	struct airtime_info *old_air, *new_air;
3856 	struct rb_node *parent = NULL;
3857 	struct txq_info *__txqi;
3858 	bool leftmost = true;
3859 
3860 	while (*new) {
3861 		parent = *new;
3862 		__txqi = rb_entry(parent, struct txq_info, schedule_order);
3863 		old_air = to_airtime_info(&__txqi->txq);
3864 		new_air = to_airtime_info(&txqi->txq);
3865 
3866 		if (new_air->v_t <= old_air->v_t) {
3867 			new = &parent->rb_left;
3868 		} else {
3869 			new = &parent->rb_right;
3870 			leftmost = false;
3871 		}
3872 	}
3873 
3874 	rb_link_node(&txqi->schedule_order, parent, new);
3875 	rb_insert_color_cached(&txqi->schedule_order, root, leftmost);
3876 }
3877 
ieee80211_resort_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq)3878 void ieee80211_resort_txq(struct ieee80211_hw *hw,
3879 			  struct ieee80211_txq *txq)
3880 {
3881 	struct airtime_info *air_info = to_airtime_info(txq);
3882 	struct ieee80211_local *local = hw_to_local(hw);
3883 	struct txq_info *txqi = to_txq_info(txq);
3884 	struct airtime_sched_info *air_sched;
3885 
3886 	air_sched = &local->airtime[txq->ac];
3887 
3888 	lockdep_assert_held(&air_sched->lock);
3889 
3890 	if (!RB_EMPTY_NODE(&txqi->schedule_order)) {
3891 		struct airtime_info *a_prev = NULL, *a_next = NULL;
3892 		struct txq_info *t_prev, *t_next;
3893 		struct rb_node *n_prev, *n_next;
3894 
3895 		/* Erasing a node can cause an expensive rebalancing operation,
3896 		 * so we check the previous and next nodes first and only remove
3897 		 * and re-insert if the current node is not already in the
3898 		 * correct position.
3899 		 */
3900 		if ((n_prev = rb_prev(&txqi->schedule_order)) != NULL) {
3901 			t_prev = container_of(n_prev, struct txq_info,
3902 					      schedule_order);
3903 			a_prev = to_airtime_info(&t_prev->txq);
3904 		}
3905 
3906 		if ((n_next = rb_next(&txqi->schedule_order)) != NULL) {
3907 			t_next = container_of(n_next, struct txq_info,
3908 					      schedule_order);
3909 			a_next = to_airtime_info(&t_next->txq);
3910 		}
3911 
3912 		if ((!a_prev || a_prev->v_t <= air_info->v_t) &&
3913 		    (!a_next || a_next->v_t > air_info->v_t))
3914 			return;
3915 
3916 		if (air_sched->schedule_pos == &txqi->schedule_order)
3917 			air_sched->schedule_pos = n_prev;
3918 
3919 		rb_erase_cached(&txqi->schedule_order,
3920 				&air_sched->active_txqs);
3921 		RB_CLEAR_NODE(&txqi->schedule_order);
3922 		__ieee80211_insert_txq(&air_sched->active_txqs, txqi);
3923 	}
3924 }
3925 
ieee80211_update_airtime_weight(struct ieee80211_local * local,struct airtime_sched_info * air_sched,u64 now,bool force)3926 void ieee80211_update_airtime_weight(struct ieee80211_local *local,
3927 				     struct airtime_sched_info *air_sched,
3928 				     u64 now, bool force)
3929 {
3930 	struct airtime_info *air_info, *tmp;
3931 	u64 weight_sum = 0;
3932 
3933 	if (unlikely(!now))
3934 		now = ktime_get_coarse_boottime_ns();
3935 
3936 	lockdep_assert_held(&air_sched->lock);
3937 
3938 	if (!force && (air_sched->last_weight_update <
3939 		       now - AIRTIME_ACTIVE_DURATION))
3940 		return;
3941 
3942 	list_for_each_entry_safe(air_info, tmp,
3943 				 &air_sched->active_list, list) {
3944 		if (airtime_is_active(air_info, now))
3945 			weight_sum += air_info->weight;
3946 		else
3947 			list_del_init(&air_info->list);
3948 	}
3949 	airtime_weight_sum_set(air_sched, weight_sum);
3950 	air_sched->last_weight_update = now;
3951 }
3952 
ieee80211_schedule_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq)3953 void ieee80211_schedule_txq(struct ieee80211_hw *hw,
3954 			    struct ieee80211_txq *txq)
3955 	__acquires(txq_lock) __releases(txq_lock)
3956 {
3957 	struct ieee80211_local *local = hw_to_local(hw);
3958 	struct txq_info *txqi = to_txq_info(txq);
3959 	struct airtime_sched_info *air_sched;
3960 	u64 now = ktime_get_coarse_boottime_ns();
3961 	struct airtime_info *air_info;
3962 	u8 ac = txq->ac;
3963 	bool was_active;
3964 
3965 	air_sched = &local->airtime[ac];
3966 	air_info = to_airtime_info(txq);
3967 
3968 	spin_lock_bh(&air_sched->lock);
3969 	was_active = airtime_is_active(air_info, now);
3970 	airtime_set_active(air_sched, air_info, now);
3971 
3972 	if (!RB_EMPTY_NODE(&txqi->schedule_order))
3973 		goto out;
3974 
3975 	/* If the station has been inactive for a while, catch up its v_t so it
3976 	 * doesn't get indefinite priority; see comment above the definition of
3977 	 * AIRTIME_MAX_BEHIND.
3978 	 */
3979 	if ((!was_active && air_info->v_t < air_sched->v_t) ||
3980 	    air_info->v_t < air_sched->v_t - AIRTIME_MAX_BEHIND)
3981 		air_info->v_t = air_sched->v_t;
3982 
3983 	ieee80211_update_airtime_weight(local, air_sched, now, !was_active);
3984 	__ieee80211_insert_txq(&air_sched->active_txqs, txqi);
3985 
3986 out:
3987 	spin_unlock_bh(&air_sched->lock);
3988 }
3989 EXPORT_SYMBOL(ieee80211_schedule_txq);
3990 
__ieee80211_unschedule_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq,bool purge)3991 static void __ieee80211_unschedule_txq(struct ieee80211_hw *hw,
3992 				       struct ieee80211_txq *txq,
3993 				       bool purge)
3994 {
3995 	struct ieee80211_local *local = hw_to_local(hw);
3996 	struct txq_info *txqi = to_txq_info(txq);
3997 	struct airtime_sched_info *air_sched;
3998 	struct airtime_info *air_info;
3999 
4000 	air_sched = &local->airtime[txq->ac];
4001 	air_info = to_airtime_info(&txqi->txq);
4002 
4003 	lockdep_assert_held(&air_sched->lock);
4004 
4005 	if (purge) {
4006 		list_del_init(&air_info->list);
4007 		ieee80211_update_airtime_weight(local, air_sched, 0, true);
4008 	}
4009 
4010 	if (RB_EMPTY_NODE(&txqi->schedule_order))
4011 		return;
4012 
4013 	if (air_sched->schedule_pos == &txqi->schedule_order)
4014 		air_sched->schedule_pos = rb_prev(&txqi->schedule_order);
4015 
4016 	if (!purge)
4017 		airtime_set_active(air_sched, air_info,
4018 				   ktime_get_coarse_boottime_ns());
4019 
4020 	rb_erase_cached(&txqi->schedule_order,
4021 			&air_sched->active_txqs);
4022 	RB_CLEAR_NODE(&txqi->schedule_order);
4023 }
4024 
ieee80211_unschedule_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq,bool purge)4025 void ieee80211_unschedule_txq(struct ieee80211_hw *hw,
4026 			      struct ieee80211_txq *txq,
4027 			      bool purge)
4028 	__acquires(txq_lock) __releases(txq_lock)
4029 {
4030 	struct ieee80211_local *local = hw_to_local(hw);
4031 
4032 	spin_lock_bh(&local->airtime[txq->ac].lock);
4033 	__ieee80211_unschedule_txq(hw, txq, purge);
4034 	spin_unlock_bh(&local->airtime[txq->ac].lock);
4035 }
4036 
ieee80211_return_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq,bool force)4037 void ieee80211_return_txq(struct ieee80211_hw *hw,
4038 			  struct ieee80211_txq *txq, bool force)
4039 {
4040 	struct ieee80211_local *local = hw_to_local(hw);
4041 	struct txq_info *txqi = to_txq_info(txq);
4042 
4043 	spin_lock_bh(&local->airtime[txq->ac].lock);
4044 
4045 	if (!RB_EMPTY_NODE(&txqi->schedule_order) && !force &&
4046 	    !txq_has_queue(txq))
4047 		__ieee80211_unschedule_txq(hw, txq, false);
4048 
4049 	spin_unlock_bh(&local->airtime[txq->ac].lock);
4050 }
4051 EXPORT_SYMBOL(ieee80211_return_txq);
4052 
4053 DEFINE_STATIC_KEY_FALSE(aql_disable);
4054 
ieee80211_txq_airtime_check(struct ieee80211_hw * hw,struct ieee80211_txq * txq)4055 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw,
4056 				 struct ieee80211_txq *txq)
4057 {
4058 	struct airtime_info *air_info = to_airtime_info(txq);
4059 	struct ieee80211_local *local = hw_to_local(hw);
4060 
4061 	if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
4062 		return true;
4063 
4064 	if (static_branch_unlikely(&aql_disable))
4065 		return true;
4066 
4067 	if (!txq->sta)
4068 		return true;
4069 
4070 	if (unlikely(txq->tid == IEEE80211_NUM_TIDS))
4071 		return true;
4072 
4073 	if (atomic_read(&air_info->aql_tx_pending) < air_info->aql_limit_low)
4074 		return true;
4075 
4076 	if (atomic_read(&local->aql_total_pending_airtime) <
4077 	    local->aql_threshold &&
4078 	    atomic_read(&air_info->aql_tx_pending) < air_info->aql_limit_high)
4079 		return true;
4080 
4081 	return false;
4082 }
4083 EXPORT_SYMBOL(ieee80211_txq_airtime_check);
4084 
ieee80211_txq_may_transmit(struct ieee80211_hw * hw,struct ieee80211_txq * txq)4085 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw,
4086 				struct ieee80211_txq *txq)
4087 {
4088 	struct txq_info *first_txqi = NULL, *txqi = to_txq_info(txq);
4089 	struct ieee80211_local *local = hw_to_local(hw);
4090 	struct airtime_sched_info *air_sched;
4091 	struct airtime_info *air_info;
4092 	struct rb_node *node = NULL;
4093 	bool ret = false;
4094 	u64 now;
4095 
4096 
4097 	if (!ieee80211_txq_airtime_check(hw, txq))
4098 		return false;
4099 
4100 	air_sched = &local->airtime[txq->ac];
4101 	spin_lock_bh(&air_sched->lock);
4102 
4103 	if (RB_EMPTY_NODE(&txqi->schedule_order))
4104 		goto out;
4105 
4106 	now = ktime_get_coarse_boottime_ns();
4107 
4108 	/* Like in ieee80211_next_txq(), make sure the first station in the
4109 	 * scheduling order is eligible for transmission to avoid starvation.
4110 	 */
4111 	node = rb_first_cached(&air_sched->active_txqs);
4112 	if (node) {
4113 		first_txqi = container_of(node, struct txq_info,
4114 					  schedule_order);
4115 		air_info = to_airtime_info(&first_txqi->txq);
4116 
4117 		if (air_sched->v_t < air_info->v_t)
4118 			airtime_catchup_v_t(air_sched, air_info->v_t, now);
4119 	}
4120 
4121 	air_info = to_airtime_info(&txqi->txq);
4122 	if (air_info->v_t <= air_sched->v_t) {
4123 		air_sched->last_schedule_activity = now;
4124 		ret = true;
4125 	}
4126 
4127 out:
4128 	spin_unlock_bh(&air_sched->lock);
4129 	return ret;
4130 }
4131 EXPORT_SYMBOL(ieee80211_txq_may_transmit);
4132 
ieee80211_txq_schedule_start(struct ieee80211_hw * hw,u8 ac)4133 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac)
4134 {
4135 	struct ieee80211_local *local = hw_to_local(hw);
4136 	struct airtime_sched_info *air_sched = &local->airtime[ac];
4137 
4138 	spin_lock_bh(&air_sched->lock);
4139 	air_sched->schedule_pos = NULL;
4140 	spin_unlock_bh(&air_sched->lock);
4141 }
4142 EXPORT_SYMBOL(ieee80211_txq_schedule_start);
4143 
__ieee80211_subif_start_xmit(struct sk_buff * skb,struct net_device * dev,u32 info_flags,u32 ctrl_flags,u64 * cookie)4144 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
4145 				  struct net_device *dev,
4146 				  u32 info_flags,
4147 				  u32 ctrl_flags,
4148 				  u64 *cookie)
4149 {
4150 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4151 	struct ieee80211_local *local = sdata->local;
4152 	struct sta_info *sta;
4153 	struct sk_buff *next;
4154 	int len = skb->len;
4155 
4156 	if (unlikely(skb->len < ETH_HLEN)) {
4157 		kfree_skb(skb);
4158 		return;
4159 	}
4160 
4161 	rcu_read_lock();
4162 
4163 	if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
4164 		goto out_free;
4165 
4166 	if (IS_ERR(sta))
4167 		sta = NULL;
4168 
4169 	if (local->ops->wake_tx_queue) {
4170 		u16 queue = __ieee80211_select_queue(sdata, sta, skb);
4171 		skb_set_queue_mapping(skb, queue);
4172 		skb_get_hash(skb);
4173 	}
4174 
4175 	ieee80211_aggr_check(sdata, sta, skb);
4176 
4177 	sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
4178 
4179 	if (sta) {
4180 		struct ieee80211_fast_tx *fast_tx;
4181 
4182 		fast_tx = rcu_dereference(sta->fast_tx);
4183 
4184 		if (fast_tx &&
4185 		    ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
4186 			goto out;
4187 	}
4188 
4189 	if (skb_is_gso(skb)) {
4190 		struct sk_buff *segs;
4191 
4192 		segs = skb_gso_segment(skb, 0);
4193 		if (IS_ERR(segs)) {
4194 			goto out_free;
4195 		} else if (segs) {
4196 			consume_skb(skb);
4197 			skb = segs;
4198 		}
4199 	} else {
4200 		/* we cannot process non-linear frames on this path */
4201 		if (skb_linearize(skb))
4202 			goto out_free;
4203 
4204 		/* the frame could be fragmented, software-encrypted, and other
4205 		 * things so we cannot really handle checksum offload with it -
4206 		 * fix it up in software before we handle anything else.
4207 		 */
4208 		if (skb->ip_summed == CHECKSUM_PARTIAL) {
4209 			skb_set_transport_header(skb,
4210 						 skb_checksum_start_offset(skb));
4211 			if (skb_checksum_help(skb))
4212 				goto out_free;
4213 		}
4214 	}
4215 
4216 	skb_list_walk_safe(skb, skb, next) {
4217 		skb_mark_not_on_list(skb);
4218 
4219 		if (skb->protocol == sdata->control_port_protocol)
4220 			ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
4221 
4222 		skb = ieee80211_build_hdr(sdata, skb, info_flags,
4223 					  sta, ctrl_flags, cookie);
4224 		if (IS_ERR(skb)) {
4225 			kfree_skb_list(next);
4226 			goto out;
4227 		}
4228 
4229 		dev_sw_netstats_tx_add(dev, 1, skb->len);
4230 
4231 		ieee80211_xmit(sdata, sta, skb);
4232 	}
4233 	goto out;
4234  out_free:
4235 	kfree_skb(skb);
4236 	len = 0;
4237  out:
4238 	if (len)
4239 		ieee80211_tpt_led_trig_tx(local, len);
4240 	rcu_read_unlock();
4241 }
4242 
ieee80211_change_da(struct sk_buff * skb,struct sta_info * sta)4243 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
4244 {
4245 	struct ethhdr *eth;
4246 	int err;
4247 
4248 	err = skb_ensure_writable(skb, ETH_HLEN);
4249 	if (unlikely(err))
4250 		return err;
4251 
4252 	eth = (void *)skb->data;
4253 	ether_addr_copy(eth->h_dest, sta->sta.addr);
4254 
4255 	return 0;
4256 }
4257 
ieee80211_multicast_to_unicast(struct sk_buff * skb,struct net_device * dev)4258 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
4259 					   struct net_device *dev)
4260 {
4261 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4262 	const struct ethhdr *eth = (void *)skb->data;
4263 	const struct vlan_ethhdr *ethvlan = (void *)skb->data;
4264 	__be16 ethertype;
4265 
4266 	if (likely(!is_multicast_ether_addr(eth->h_dest)))
4267 		return false;
4268 
4269 	switch (sdata->vif.type) {
4270 	case NL80211_IFTYPE_AP_VLAN:
4271 		if (sdata->u.vlan.sta)
4272 			return false;
4273 		if (sdata->wdev.use_4addr)
4274 			return false;
4275 		fallthrough;
4276 	case NL80211_IFTYPE_AP:
4277 		/* check runtime toggle for this bss */
4278 		if (!sdata->bss->multicast_to_unicast)
4279 			return false;
4280 		break;
4281 	default:
4282 		return false;
4283 	}
4284 
4285 	/* multicast to unicast conversion only for some payload */
4286 	ethertype = eth->h_proto;
4287 	if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
4288 		ethertype = ethvlan->h_vlan_encapsulated_proto;
4289 	switch (ethertype) {
4290 	case htons(ETH_P_ARP):
4291 	case htons(ETH_P_IP):
4292 	case htons(ETH_P_IPV6):
4293 		break;
4294 	default:
4295 		return false;
4296 	}
4297 
4298 	return true;
4299 }
4300 
4301 static void
ieee80211_convert_to_unicast(struct sk_buff * skb,struct net_device * dev,struct sk_buff_head * queue)4302 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
4303 			     struct sk_buff_head *queue)
4304 {
4305 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4306 	struct ieee80211_local *local = sdata->local;
4307 	const struct ethhdr *eth = (struct ethhdr *)skb->data;
4308 	struct sta_info *sta, *first = NULL;
4309 	struct sk_buff *cloned_skb;
4310 
4311 	rcu_read_lock();
4312 
4313 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
4314 		if (sdata != sta->sdata)
4315 			/* AP-VLAN mismatch */
4316 			continue;
4317 		if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
4318 			/* do not send back to source */
4319 			continue;
4320 		if (!first) {
4321 			first = sta;
4322 			continue;
4323 		}
4324 		cloned_skb = skb_clone(skb, GFP_ATOMIC);
4325 		if (!cloned_skb)
4326 			goto multicast;
4327 		if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
4328 			dev_kfree_skb(cloned_skb);
4329 			goto multicast;
4330 		}
4331 		__skb_queue_tail(queue, cloned_skb);
4332 	}
4333 
4334 	if (likely(first)) {
4335 		if (unlikely(ieee80211_change_da(skb, first)))
4336 			goto multicast;
4337 		__skb_queue_tail(queue, skb);
4338 	} else {
4339 		/* no STA connected, drop */
4340 		kfree_skb(skb);
4341 		skb = NULL;
4342 	}
4343 
4344 	goto out;
4345 multicast:
4346 	__skb_queue_purge(queue);
4347 	__skb_queue_tail(queue, skb);
4348 out:
4349 	rcu_read_unlock();
4350 }
4351 
4352 /**
4353  * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
4354  * @skb: packet to be sent
4355  * @dev: incoming interface
4356  *
4357  * On failure skb will be freed.
4358  */
ieee80211_subif_start_xmit(struct sk_buff * skb,struct net_device * dev)4359 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
4360 				       struct net_device *dev)
4361 {
4362 	if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
4363 		struct sk_buff_head queue;
4364 
4365 		__skb_queue_head_init(&queue);
4366 		ieee80211_convert_to_unicast(skb, dev, &queue);
4367 		while ((skb = __skb_dequeue(&queue)))
4368 			__ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL);
4369 	} else {
4370 		__ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL);
4371 	}
4372 
4373 	return NETDEV_TX_OK;
4374 }
4375 
ieee80211_tx_8023(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct sta_info * sta,bool txpending)4376 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
4377 			      struct sk_buff *skb, struct sta_info *sta,
4378 			      bool txpending)
4379 {
4380 	struct ieee80211_local *local = sdata->local;
4381 	struct ieee80211_tx_control control = {};
4382 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4383 	struct ieee80211_sta *pubsta = NULL;
4384 	unsigned long flags;
4385 	int q = info->hw_queue;
4386 
4387 	if (sta)
4388 		sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift);
4389 
4390 	ieee80211_tpt_led_trig_tx(local, skb->len);
4391 
4392 	if (ieee80211_queue_skb(local, sdata, sta, skb))
4393 		return true;
4394 
4395 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4396 
4397 	if (local->queue_stop_reasons[q] ||
4398 	    (!txpending && !skb_queue_empty(&local->pending[q]))) {
4399 		if (txpending)
4400 			skb_queue_head(&local->pending[q], skb);
4401 		else
4402 			skb_queue_tail(&local->pending[q], skb);
4403 
4404 		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4405 
4406 		return false;
4407 	}
4408 
4409 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4410 
4411 	if (sta && sta->uploaded)
4412 		pubsta = &sta->sta;
4413 
4414 	control.sta = pubsta;
4415 
4416 	drv_tx(local, &control, skb);
4417 
4418 	return true;
4419 }
4420 
ieee80211_8023_xmit(struct ieee80211_sub_if_data * sdata,struct net_device * dev,struct sta_info * sta,struct ieee80211_key * key,struct sk_buff * skb)4421 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
4422 				struct net_device *dev, struct sta_info *sta,
4423 				struct ieee80211_key *key, struct sk_buff *skb)
4424 {
4425 	struct ieee80211_tx_info *info;
4426 	struct ieee80211_local *local = sdata->local;
4427 	struct tid_ampdu_tx *tid_tx;
4428 	u8 tid;
4429 
4430 	if (local->ops->wake_tx_queue) {
4431 		u16 queue = __ieee80211_select_queue(sdata, sta, skb);
4432 		skb_set_queue_mapping(skb, queue);
4433 		skb_get_hash(skb);
4434 	}
4435 
4436 	if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) &&
4437 	    test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
4438 		goto out_free;
4439 
4440 	skb = skb_share_check(skb, GFP_ATOMIC);
4441 	if (unlikely(!skb))
4442 		return;
4443 
4444 	info = IEEE80211_SKB_CB(skb);
4445 	memset(info, 0, sizeof(*info));
4446 
4447 	ieee80211_aggr_check(sdata, sta, skb);
4448 
4449 	tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
4450 	tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
4451 	if (tid_tx) {
4452 		if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
4453 			/* fall back to non-offload slow path */
4454 			__ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL);
4455 			return;
4456 		}
4457 
4458 		info->flags |= IEEE80211_TX_CTL_AMPDU;
4459 		if (tid_tx->timeout)
4460 			tid_tx->last_tx = jiffies;
4461 	}
4462 
4463 	if (unlikely(skb->sk &&
4464 		     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS))
4465 		info->ack_frame_id = ieee80211_store_ack_skb(local, skb,
4466 							     &info->flags, NULL);
4467 
4468 	info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
4469 
4470 	dev_sw_netstats_tx_add(dev, 1, skb->len);
4471 
4472 	sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
4473 	sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++;
4474 
4475 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4476 		sdata = container_of(sdata->bss,
4477 				     struct ieee80211_sub_if_data, u.ap);
4478 
4479 	info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP;
4480 	info->control.vif = &sdata->vif;
4481 
4482 	if (key)
4483 		info->control.hw_key = &key->conf;
4484 
4485 	ieee80211_tx_8023(sdata, skb, sta, false);
4486 
4487 	return;
4488 
4489 out_free:
4490 	kfree_skb(skb);
4491 }
4492 
ieee80211_subif_start_xmit_8023(struct sk_buff * skb,struct net_device * dev)4493 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
4494 					    struct net_device *dev)
4495 {
4496 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4497 	struct ethhdr *ehdr = (struct ethhdr *)skb->data;
4498 	struct ieee80211_key *key;
4499 	struct sta_info *sta;
4500 
4501 	if (unlikely(skb->len < ETH_HLEN)) {
4502 		kfree_skb(skb);
4503 		return NETDEV_TX_OK;
4504 	}
4505 
4506 	rcu_read_lock();
4507 
4508 	if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4509 		kfree_skb(skb);
4510 		goto out;
4511 	}
4512 
4513 	if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded ||
4514 	    !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
4515 	    sdata->control_port_protocol == ehdr->h_proto))
4516 		goto skip_offload;
4517 
4518 	key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4519 	if (!key)
4520 		key = rcu_dereference(sdata->default_unicast_key);
4521 
4522 	if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) ||
4523 		    key->conf.cipher == WLAN_CIPHER_SUITE_TKIP))
4524 		goto skip_offload;
4525 
4526 	ieee80211_8023_xmit(sdata, dev, sta, key, skb);
4527 	goto out;
4528 
4529 skip_offload:
4530 	ieee80211_subif_start_xmit(skb, dev);
4531 out:
4532 	rcu_read_unlock();
4533 
4534 	return NETDEV_TX_OK;
4535 }
4536 
4537 struct sk_buff *
ieee80211_build_data_template(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 info_flags)4538 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
4539 			      struct sk_buff *skb, u32 info_flags)
4540 {
4541 	struct ieee80211_hdr *hdr;
4542 	struct ieee80211_tx_data tx = {
4543 		.local = sdata->local,
4544 		.sdata = sdata,
4545 	};
4546 	struct sta_info *sta;
4547 
4548 	rcu_read_lock();
4549 
4550 	if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4551 		kfree_skb(skb);
4552 		skb = ERR_PTR(-EINVAL);
4553 		goto out;
4554 	}
4555 
4556 	skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL);
4557 	if (IS_ERR(skb))
4558 		goto out;
4559 
4560 	hdr = (void *)skb->data;
4561 	tx.sta = sta_info_get(sdata, hdr->addr1);
4562 	tx.skb = skb;
4563 
4564 	if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
4565 		rcu_read_unlock();
4566 		kfree_skb(skb);
4567 		return ERR_PTR(-EINVAL);
4568 	}
4569 
4570 out:
4571 	rcu_read_unlock();
4572 	return skb;
4573 }
4574 
4575 /*
4576  * ieee80211_clear_tx_pending may not be called in a context where
4577  * it is possible that it packets could come in again.
4578  */
ieee80211_clear_tx_pending(struct ieee80211_local * local)4579 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
4580 {
4581 	struct sk_buff *skb;
4582 	int i;
4583 
4584 	for (i = 0; i < local->hw.queues; i++) {
4585 		while ((skb = skb_dequeue(&local->pending[i])) != NULL)
4586 			ieee80211_free_txskb(&local->hw, skb);
4587 	}
4588 }
4589 
4590 /*
4591  * Returns false if the frame couldn't be transmitted but was queued instead,
4592  * which in this case means re-queued -- take as an indication to stop sending
4593  * more pending frames.
4594  */
ieee80211_tx_pending_skb(struct ieee80211_local * local,struct sk_buff * skb)4595 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
4596 				     struct sk_buff *skb)
4597 {
4598 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4599 	struct ieee80211_sub_if_data *sdata;
4600 	struct sta_info *sta;
4601 	struct ieee80211_hdr *hdr;
4602 	bool result;
4603 	struct ieee80211_chanctx_conf *chanctx_conf;
4604 
4605 	sdata = vif_to_sdata(info->control.vif);
4606 
4607 	if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) {
4608 		chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
4609 		if (unlikely(!chanctx_conf)) {
4610 			dev_kfree_skb(skb);
4611 			return true;
4612 		}
4613 		info->band = chanctx_conf->def.chan->band;
4614 		result = ieee80211_tx(sdata, NULL, skb, true);
4615 	} else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
4616 		if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4617 			dev_kfree_skb(skb);
4618 			return true;
4619 		}
4620 
4621 		if (IS_ERR(sta) || (sta && !sta->uploaded))
4622 			sta = NULL;
4623 
4624 		result = ieee80211_tx_8023(sdata, skb, sta, true);
4625 	} else {
4626 		struct sk_buff_head skbs;
4627 
4628 		__skb_queue_head_init(&skbs);
4629 		__skb_queue_tail(&skbs, skb);
4630 
4631 		hdr = (struct ieee80211_hdr *)skb->data;
4632 		sta = sta_info_get(sdata, hdr->addr1);
4633 
4634 		result = __ieee80211_tx(local, &skbs, sta, true);
4635 	}
4636 
4637 	return result;
4638 }
4639 
4640 /*
4641  * Transmit all pending packets. Called from tasklet.
4642  */
ieee80211_tx_pending(struct tasklet_struct * t)4643 void ieee80211_tx_pending(struct tasklet_struct *t)
4644 {
4645 	struct ieee80211_local *local = from_tasklet(local, t,
4646 						     tx_pending_tasklet);
4647 	unsigned long flags;
4648 	int i;
4649 	bool txok;
4650 
4651 	rcu_read_lock();
4652 
4653 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4654 	for (i = 0; i < local->hw.queues; i++) {
4655 		/*
4656 		 * If queue is stopped by something other than due to pending
4657 		 * frames, or we have no pending frames, proceed to next queue.
4658 		 */
4659 		if (local->queue_stop_reasons[i] ||
4660 		    skb_queue_empty(&local->pending[i]))
4661 			continue;
4662 
4663 		while (!skb_queue_empty(&local->pending[i])) {
4664 			struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
4665 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4666 
4667 			if (WARN_ON(!info->control.vif)) {
4668 				ieee80211_free_txskb(&local->hw, skb);
4669 				continue;
4670 			}
4671 
4672 			spin_unlock_irqrestore(&local->queue_stop_reason_lock,
4673 						flags);
4674 
4675 			txok = ieee80211_tx_pending_skb(local, skb);
4676 			spin_lock_irqsave(&local->queue_stop_reason_lock,
4677 					  flags);
4678 			if (!txok)
4679 				break;
4680 		}
4681 
4682 		if (skb_queue_empty(&local->pending[i]))
4683 			ieee80211_propagate_queue_wake(local, i);
4684 	}
4685 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4686 
4687 	rcu_read_unlock();
4688 }
4689 
4690 /* functions for drivers to get certain frames */
4691 
__ieee80211_beacon_add_tim(struct ieee80211_sub_if_data * sdata,struct ps_data * ps,struct sk_buff * skb,bool is_template)4692 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4693 				       struct ps_data *ps, struct sk_buff *skb,
4694 				       bool is_template)
4695 {
4696 	u8 *pos, *tim;
4697 	int aid0 = 0;
4698 	int i, have_bits = 0, n1, n2;
4699 
4700 	/* Generate bitmap for TIM only if there are any STAs in power save
4701 	 * mode. */
4702 	if (atomic_read(&ps->num_sta_ps) > 0)
4703 		/* in the hope that this is faster than
4704 		 * checking byte-for-byte */
4705 		have_bits = !bitmap_empty((unsigned long *)ps->tim,
4706 					  IEEE80211_MAX_AID+1);
4707 	if (!is_template) {
4708 		if (ps->dtim_count == 0)
4709 			ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
4710 		else
4711 			ps->dtim_count--;
4712 	}
4713 
4714 	tim = pos = skb_put(skb, 6);
4715 	*pos++ = WLAN_EID_TIM;
4716 	*pos++ = 4;
4717 	*pos++ = ps->dtim_count;
4718 	*pos++ = sdata->vif.bss_conf.dtim_period;
4719 
4720 	if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
4721 		aid0 = 1;
4722 
4723 	ps->dtim_bc_mc = aid0 == 1;
4724 
4725 	if (have_bits) {
4726 		/* Find largest even number N1 so that bits numbered 1 through
4727 		 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4728 		 * (N2 + 1) x 8 through 2007 are 0. */
4729 		n1 = 0;
4730 		for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4731 			if (ps->tim[i]) {
4732 				n1 = i & 0xfe;
4733 				break;
4734 			}
4735 		}
4736 		n2 = n1;
4737 		for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4738 			if (ps->tim[i]) {
4739 				n2 = i;
4740 				break;
4741 			}
4742 		}
4743 
4744 		/* Bitmap control */
4745 		*pos++ = n1 | aid0;
4746 		/* Part Virt Bitmap */
4747 		skb_put(skb, n2 - n1);
4748 		memcpy(pos, ps->tim + n1, n2 - n1 + 1);
4749 
4750 		tim[1] = n2 - n1 + 4;
4751 	} else {
4752 		*pos++ = aid0; /* Bitmap control */
4753 		*pos++ = 0; /* Part Virt Bitmap */
4754 	}
4755 }
4756 
ieee80211_beacon_add_tim(struct ieee80211_sub_if_data * sdata,struct ps_data * ps,struct sk_buff * skb,bool is_template)4757 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4758 				    struct ps_data *ps, struct sk_buff *skb,
4759 				    bool is_template)
4760 {
4761 	struct ieee80211_local *local = sdata->local;
4762 
4763 	/*
4764 	 * Not very nice, but we want to allow the driver to call
4765 	 * ieee80211_beacon_get() as a response to the set_tim()
4766 	 * callback. That, however, is already invoked under the
4767 	 * sta_lock to guarantee consistent and race-free update
4768 	 * of the tim bitmap in mac80211 and the driver.
4769 	 */
4770 	if (local->tim_in_locked_section) {
4771 		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4772 	} else {
4773 		spin_lock_bh(&local->tim_lock);
4774 		__ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4775 		spin_unlock_bh(&local->tim_lock);
4776 	}
4777 
4778 	return 0;
4779 }
4780 
ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data * sdata,struct beacon_data * beacon)4781 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata,
4782 					struct beacon_data *beacon)
4783 {
4784 	u8 *beacon_data, count, max_count = 1;
4785 	struct probe_resp *resp;
4786 	size_t beacon_data_len;
4787 	u16 *bcn_offsets;
4788 	int i;
4789 
4790 	switch (sdata->vif.type) {
4791 	case NL80211_IFTYPE_AP:
4792 		beacon_data = beacon->tail;
4793 		beacon_data_len = beacon->tail_len;
4794 		break;
4795 	case NL80211_IFTYPE_ADHOC:
4796 		beacon_data = beacon->head;
4797 		beacon_data_len = beacon->head_len;
4798 		break;
4799 	case NL80211_IFTYPE_MESH_POINT:
4800 		beacon_data = beacon->head;
4801 		beacon_data_len = beacon->head_len;
4802 		break;
4803 	default:
4804 		return;
4805 	}
4806 
4807 	rcu_read_lock();
4808 	resp = rcu_dereference(sdata->u.ap.probe_resp);
4809 
4810 	bcn_offsets = beacon->cntdwn_counter_offsets;
4811 	count = beacon->cntdwn_current_counter;
4812 	if (sdata->vif.bss_conf.csa_active)
4813 		max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM;
4814 
4815 	for (i = 0; i < max_count; ++i) {
4816 		if (bcn_offsets[i]) {
4817 			if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) {
4818 				rcu_read_unlock();
4819 				return;
4820 			}
4821 			beacon_data[bcn_offsets[i]] = count;
4822 		}
4823 
4824 		if (sdata->vif.type == NL80211_IFTYPE_AP && resp) {
4825 			u16 *resp_offsets = resp->cntdwn_counter_offsets;
4826 
4827 			resp->data[resp_offsets[i]] = count;
4828 		}
4829 	}
4830 	rcu_read_unlock();
4831 }
4832 
__ieee80211_beacon_update_cntdwn(struct beacon_data * beacon)4833 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon)
4834 {
4835 	beacon->cntdwn_current_counter--;
4836 
4837 	/* the counter should never reach 0 */
4838 	WARN_ON_ONCE(!beacon->cntdwn_current_counter);
4839 
4840 	return beacon->cntdwn_current_counter;
4841 }
4842 
ieee80211_beacon_update_cntdwn(struct ieee80211_vif * vif)4843 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif)
4844 {
4845 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4846 	struct beacon_data *beacon = NULL;
4847 	u8 count = 0;
4848 
4849 	rcu_read_lock();
4850 
4851 	if (sdata->vif.type == NL80211_IFTYPE_AP)
4852 		beacon = rcu_dereference(sdata->u.ap.beacon);
4853 	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4854 		beacon = rcu_dereference(sdata->u.ibss.presp);
4855 	else if (ieee80211_vif_is_mesh(&sdata->vif))
4856 		beacon = rcu_dereference(sdata->u.mesh.beacon);
4857 
4858 	if (!beacon)
4859 		goto unlock;
4860 
4861 	count = __ieee80211_beacon_update_cntdwn(beacon);
4862 
4863 unlock:
4864 	rcu_read_unlock();
4865 	return count;
4866 }
4867 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn);
4868 
ieee80211_beacon_set_cntdwn(struct ieee80211_vif * vif,u8 counter)4869 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter)
4870 {
4871 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4872 	struct beacon_data *beacon = NULL;
4873 
4874 	rcu_read_lock();
4875 
4876 	if (sdata->vif.type == NL80211_IFTYPE_AP)
4877 		beacon = rcu_dereference(sdata->u.ap.beacon);
4878 	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4879 		beacon = rcu_dereference(sdata->u.ibss.presp);
4880 	else if (ieee80211_vif_is_mesh(&sdata->vif))
4881 		beacon = rcu_dereference(sdata->u.mesh.beacon);
4882 
4883 	if (!beacon)
4884 		goto unlock;
4885 
4886 	if (counter < beacon->cntdwn_current_counter)
4887 		beacon->cntdwn_current_counter = counter;
4888 
4889 unlock:
4890 	rcu_read_unlock();
4891 }
4892 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn);
4893 
ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif * vif)4894 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif)
4895 {
4896 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4897 	struct beacon_data *beacon = NULL;
4898 	u8 *beacon_data;
4899 	size_t beacon_data_len;
4900 	int ret = false;
4901 
4902 	if (!ieee80211_sdata_running(sdata))
4903 		return false;
4904 
4905 	rcu_read_lock();
4906 	if (vif->type == NL80211_IFTYPE_AP) {
4907 		struct ieee80211_if_ap *ap = &sdata->u.ap;
4908 
4909 		beacon = rcu_dereference(ap->beacon);
4910 		if (WARN_ON(!beacon || !beacon->tail))
4911 			goto out;
4912 		beacon_data = beacon->tail;
4913 		beacon_data_len = beacon->tail_len;
4914 	} else if (vif->type == NL80211_IFTYPE_ADHOC) {
4915 		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4916 
4917 		beacon = rcu_dereference(ifibss->presp);
4918 		if (!beacon)
4919 			goto out;
4920 
4921 		beacon_data = beacon->head;
4922 		beacon_data_len = beacon->head_len;
4923 	} else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4924 		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4925 
4926 		beacon = rcu_dereference(ifmsh->beacon);
4927 		if (!beacon)
4928 			goto out;
4929 
4930 		beacon_data = beacon->head;
4931 		beacon_data_len = beacon->head_len;
4932 	} else {
4933 		WARN_ON(1);
4934 		goto out;
4935 	}
4936 
4937 	if (!beacon->cntdwn_counter_offsets[0])
4938 		goto out;
4939 
4940 	if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len))
4941 		goto out;
4942 
4943 	if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1)
4944 		ret = true;
4945 
4946  out:
4947 	rcu_read_unlock();
4948 
4949 	return ret;
4950 }
4951 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete);
4952 
ieee80211_beacon_protect(struct sk_buff * skb,struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)4953 static int ieee80211_beacon_protect(struct sk_buff *skb,
4954 				    struct ieee80211_local *local,
4955 				    struct ieee80211_sub_if_data *sdata)
4956 {
4957 	ieee80211_tx_result res;
4958 	struct ieee80211_tx_data tx;
4959 	struct sk_buff *check_skb;
4960 
4961 	memset(&tx, 0, sizeof(tx));
4962 	tx.key = rcu_dereference(sdata->default_beacon_key);
4963 	if (!tx.key)
4964 		return 0;
4965 	tx.local = local;
4966 	tx.sdata = sdata;
4967 	__skb_queue_head_init(&tx.skbs);
4968 	__skb_queue_tail(&tx.skbs, skb);
4969 	res = ieee80211_tx_h_encrypt(&tx);
4970 	check_skb = __skb_dequeue(&tx.skbs);
4971 	/* we may crash after this, but it'd be a bug in crypto */
4972 	WARN_ON(check_skb != skb);
4973 	if (WARN_ON_ONCE(res != TX_CONTINUE))
4974 		return -EINVAL;
4975 
4976 	return 0;
4977 }
4978 
4979 static void
ieee80211_beacon_get_finish(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs,struct beacon_data * beacon,struct sk_buff * skb,struct ieee80211_chanctx_conf * chanctx_conf,u16 csa_off_base)4980 ieee80211_beacon_get_finish(struct ieee80211_hw *hw,
4981 			    struct ieee80211_vif *vif,
4982 			    struct ieee80211_mutable_offsets *offs,
4983 			    struct beacon_data *beacon,
4984 			    struct sk_buff *skb,
4985 			    struct ieee80211_chanctx_conf *chanctx_conf,
4986 			    u16 csa_off_base)
4987 {
4988 	struct ieee80211_local *local = hw_to_local(hw);
4989 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4990 	struct ieee80211_tx_info *info;
4991 	enum nl80211_band band;
4992 	struct ieee80211_tx_rate_control txrc;
4993 
4994 	/* CSA offsets */
4995 	if (offs && beacon) {
4996 		u16 i;
4997 
4998 		for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) {
4999 			u16 csa_off = beacon->cntdwn_counter_offsets[i];
5000 
5001 			if (!csa_off)
5002 				continue;
5003 
5004 			offs->cntdwn_counter_offs[i] = csa_off_base + csa_off;
5005 		}
5006 	}
5007 
5008 	band = chanctx_conf->def.chan->band;
5009 	info = IEEE80211_SKB_CB(skb);
5010 	info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
5011 	info->flags |= IEEE80211_TX_CTL_NO_ACK;
5012 	info->band = band;
5013 
5014 	memset(&txrc, 0, sizeof(txrc));
5015 	txrc.hw = hw;
5016 	txrc.sband = local->hw.wiphy->bands[band];
5017 	txrc.bss_conf = &sdata->vif.bss_conf;
5018 	txrc.skb = skb;
5019 	txrc.reported_rate.idx = -1;
5020 	if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band])
5021 		txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band];
5022 	else
5023 		txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
5024 	txrc.bss = true;
5025 	rate_control_get_rate(sdata, NULL, &txrc);
5026 
5027 	info->control.vif = vif;
5028 	info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
5029 		       IEEE80211_TX_CTL_ASSIGN_SEQ |
5030 		       IEEE80211_TX_CTL_FIRST_FRAGMENT;
5031 }
5032 
5033 static void
ieee80211_beacon_add_mbssid(struct sk_buff * skb,struct beacon_data * beacon)5034 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon)
5035 {
5036 	int i;
5037 
5038 	if (!beacon->mbssid_ies)
5039 		return;
5040 
5041 	for (i = 0; i < beacon->mbssid_ies->cnt; i++)
5042 		skb_put_data(skb, beacon->mbssid_ies->elem[i].data,
5043 			     beacon->mbssid_ies->elem[i].len);
5044 }
5045 
5046 static struct sk_buff *
ieee80211_beacon_get_ap(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs,bool is_template,struct beacon_data * beacon,struct ieee80211_chanctx_conf * chanctx_conf)5047 ieee80211_beacon_get_ap(struct ieee80211_hw *hw,
5048 			struct ieee80211_vif *vif,
5049 			struct ieee80211_mutable_offsets *offs,
5050 			bool is_template,
5051 			struct beacon_data *beacon,
5052 			struct ieee80211_chanctx_conf *chanctx_conf)
5053 {
5054 	struct ieee80211_local *local = hw_to_local(hw);
5055 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5056 	struct ieee80211_if_ap *ap = &sdata->u.ap;
5057 	struct sk_buff *skb = NULL;
5058 	u16 csa_off_base = 0;
5059 	int mbssid_len;
5060 
5061 	if (beacon->cntdwn_counter_offsets[0]) {
5062 		if (!is_template)
5063 			ieee80211_beacon_update_cntdwn(vif);
5064 
5065 		ieee80211_set_beacon_cntdwn(sdata, beacon);
5066 	}
5067 
5068 	/* headroom, head length,
5069 	 * tail length, maximum TIM length and multiple BSSID length
5070 	 */
5071 	mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies);
5072 	skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
5073 			    beacon->tail_len + 256 +
5074 			    local->hw.extra_beacon_tailroom + mbssid_len);
5075 	if (!skb)
5076 		return NULL;
5077 
5078 	skb_reserve(skb, local->tx_headroom);
5079 	skb_put_data(skb, beacon->head, beacon->head_len);
5080 
5081 	ieee80211_beacon_add_tim(sdata, &ap->ps, skb, is_template);
5082 
5083 	if (offs) {
5084 		offs->tim_offset = beacon->head_len;
5085 		offs->tim_length = skb->len - beacon->head_len;
5086 		offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0];
5087 
5088 		if (mbssid_len) {
5089 			ieee80211_beacon_add_mbssid(skb, beacon);
5090 			offs->mbssid_off = skb->len - mbssid_len;
5091 		}
5092 
5093 		/* for AP the csa offsets are from tail */
5094 		csa_off_base = skb->len;
5095 	}
5096 
5097 	if (beacon->tail)
5098 		skb_put_data(skb, beacon->tail, beacon->tail_len);
5099 
5100 	if (ieee80211_beacon_protect(skb, local, sdata) < 0)
5101 		return NULL;
5102 
5103 	ieee80211_beacon_get_finish(hw, vif, offs, beacon, skb, chanctx_conf,
5104 				    csa_off_base);
5105 	return skb;
5106 }
5107 
5108 static struct sk_buff *
__ieee80211_beacon_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs,bool is_template)5109 __ieee80211_beacon_get(struct ieee80211_hw *hw,
5110 		       struct ieee80211_vif *vif,
5111 		       struct ieee80211_mutable_offsets *offs,
5112 		       bool is_template)
5113 {
5114 	struct ieee80211_local *local = hw_to_local(hw);
5115 	struct beacon_data *beacon = NULL;
5116 	struct sk_buff *skb = NULL;
5117 	struct ieee80211_sub_if_data *sdata = NULL;
5118 	struct ieee80211_chanctx_conf *chanctx_conf;
5119 
5120 	rcu_read_lock();
5121 
5122 	sdata = vif_to_sdata(vif);
5123 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
5124 
5125 	if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
5126 		goto out;
5127 
5128 	if (offs)
5129 		memset(offs, 0, sizeof(*offs));
5130 
5131 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
5132 		struct ieee80211_if_ap *ap = &sdata->u.ap;
5133 
5134 		beacon = rcu_dereference(ap->beacon);
5135 		if (!beacon)
5136 			goto out;
5137 
5138 		skb = ieee80211_beacon_get_ap(hw, vif, offs, is_template,
5139 					      beacon, chanctx_conf);
5140 	} else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
5141 		struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
5142 		struct ieee80211_hdr *hdr;
5143 
5144 		beacon = rcu_dereference(ifibss->presp);
5145 		if (!beacon)
5146 			goto out;
5147 
5148 		if (beacon->cntdwn_counter_offsets[0]) {
5149 			if (!is_template)
5150 				__ieee80211_beacon_update_cntdwn(beacon);
5151 
5152 			ieee80211_set_beacon_cntdwn(sdata, beacon);
5153 		}
5154 
5155 		skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
5156 				    local->hw.extra_beacon_tailroom);
5157 		if (!skb)
5158 			goto out;
5159 		skb_reserve(skb, local->tx_headroom);
5160 		skb_put_data(skb, beacon->head, beacon->head_len);
5161 
5162 		hdr = (struct ieee80211_hdr *) skb->data;
5163 		hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
5164 						 IEEE80211_STYPE_BEACON);
5165 
5166 		ieee80211_beacon_get_finish(hw, vif, offs, beacon, skb,
5167 					    chanctx_conf, 0);
5168 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
5169 		struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
5170 
5171 		beacon = rcu_dereference(ifmsh->beacon);
5172 		if (!beacon)
5173 			goto out;
5174 
5175 		if (beacon->cntdwn_counter_offsets[0]) {
5176 			if (!is_template)
5177 				/* TODO: For mesh csa_counter is in TU, so
5178 				 * decrementing it by one isn't correct, but
5179 				 * for now we leave it consistent with overall
5180 				 * mac80211's behavior.
5181 				 */
5182 				__ieee80211_beacon_update_cntdwn(beacon);
5183 
5184 			ieee80211_set_beacon_cntdwn(sdata, beacon);
5185 		}
5186 
5187 		if (ifmsh->sync_ops)
5188 			ifmsh->sync_ops->adjust_tsf(sdata, beacon);
5189 
5190 		skb = dev_alloc_skb(local->tx_headroom +
5191 				    beacon->head_len +
5192 				    256 + /* TIM IE */
5193 				    beacon->tail_len +
5194 				    local->hw.extra_beacon_tailroom);
5195 		if (!skb)
5196 			goto out;
5197 		skb_reserve(skb, local->tx_headroom);
5198 		skb_put_data(skb, beacon->head, beacon->head_len);
5199 		ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
5200 
5201 		if (offs) {
5202 			offs->tim_offset = beacon->head_len;
5203 			offs->tim_length = skb->len - beacon->head_len;
5204 		}
5205 
5206 		skb_put_data(skb, beacon->tail, beacon->tail_len);
5207 		ieee80211_beacon_get_finish(hw, vif, offs, beacon, skb,
5208 					    chanctx_conf, 0);
5209 	} else {
5210 		WARN_ON(1);
5211 		goto out;
5212 	}
5213 
5214  out:
5215 	rcu_read_unlock();
5216 	return skb;
5217 
5218 }
5219 
5220 struct sk_buff *
ieee80211_beacon_get_template(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs)5221 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
5222 			      struct ieee80211_vif *vif,
5223 			      struct ieee80211_mutable_offsets *offs)
5224 {
5225 	return __ieee80211_beacon_get(hw, vif, offs, true);
5226 }
5227 EXPORT_SYMBOL(ieee80211_beacon_get_template);
5228 
ieee80211_beacon_get_tim(struct ieee80211_hw * hw,struct ieee80211_vif * vif,u16 * tim_offset,u16 * tim_length)5229 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
5230 					 struct ieee80211_vif *vif,
5231 					 u16 *tim_offset, u16 *tim_length)
5232 {
5233 	struct ieee80211_mutable_offsets offs = {};
5234 	struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
5235 	struct sk_buff *copy;
5236 	struct ieee80211_supported_band *sband;
5237 	int shift;
5238 
5239 	if (!bcn)
5240 		return bcn;
5241 
5242 	if (tim_offset)
5243 		*tim_offset = offs.tim_offset;
5244 
5245 	if (tim_length)
5246 		*tim_length = offs.tim_length;
5247 
5248 	if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
5249 	    !hw_to_local(hw)->monitors)
5250 		return bcn;
5251 
5252 	/* send a copy to monitor interfaces */
5253 	copy = skb_copy(bcn, GFP_ATOMIC);
5254 	if (!copy)
5255 		return bcn;
5256 
5257 	shift = ieee80211_vif_get_shift(vif);
5258 	sband = ieee80211_get_sband(vif_to_sdata(vif));
5259 	if (!sband)
5260 		return bcn;
5261 
5262 	ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false,
5263 			     NULL);
5264 
5265 	return bcn;
5266 }
5267 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
5268 
ieee80211_proberesp_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5269 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
5270 					struct ieee80211_vif *vif)
5271 {
5272 	struct ieee80211_if_ap *ap = NULL;
5273 	struct sk_buff *skb = NULL;
5274 	struct probe_resp *presp = NULL;
5275 	struct ieee80211_hdr *hdr;
5276 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5277 
5278 	if (sdata->vif.type != NL80211_IFTYPE_AP)
5279 		return NULL;
5280 
5281 	rcu_read_lock();
5282 
5283 	ap = &sdata->u.ap;
5284 	presp = rcu_dereference(ap->probe_resp);
5285 	if (!presp)
5286 		goto out;
5287 
5288 	skb = dev_alloc_skb(presp->len);
5289 	if (!skb)
5290 		goto out;
5291 
5292 	skb_put_data(skb, presp->data, presp->len);
5293 
5294 	hdr = (struct ieee80211_hdr *) skb->data;
5295 	memset(hdr->addr1, 0, sizeof(hdr->addr1));
5296 
5297 out:
5298 	rcu_read_unlock();
5299 	return skb;
5300 }
5301 EXPORT_SYMBOL(ieee80211_proberesp_get);
5302 
ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5303 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw,
5304 						  struct ieee80211_vif *vif)
5305 {
5306 	struct sk_buff *skb = NULL;
5307 	struct fils_discovery_data *tmpl = NULL;
5308 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5309 
5310 	if (sdata->vif.type != NL80211_IFTYPE_AP)
5311 		return NULL;
5312 
5313 	rcu_read_lock();
5314 	tmpl = rcu_dereference(sdata->u.ap.fils_discovery);
5315 	if (!tmpl) {
5316 		rcu_read_unlock();
5317 		return NULL;
5318 	}
5319 
5320 	skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
5321 	if (skb) {
5322 		skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
5323 		skb_put_data(skb, tmpl->data, tmpl->len);
5324 	}
5325 
5326 	rcu_read_unlock();
5327 	return skb;
5328 }
5329 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl);
5330 
5331 struct sk_buff *
ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5332 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw,
5333 					  struct ieee80211_vif *vif)
5334 {
5335 	struct sk_buff *skb = NULL;
5336 	struct unsol_bcast_probe_resp_data *tmpl = NULL;
5337 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5338 
5339 	if (sdata->vif.type != NL80211_IFTYPE_AP)
5340 		return NULL;
5341 
5342 	rcu_read_lock();
5343 	tmpl = rcu_dereference(sdata->u.ap.unsol_bcast_probe_resp);
5344 	if (!tmpl) {
5345 		rcu_read_unlock();
5346 		return NULL;
5347 	}
5348 
5349 	skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
5350 	if (skb) {
5351 		skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
5352 		skb_put_data(skb, tmpl->data, tmpl->len);
5353 	}
5354 
5355 	rcu_read_unlock();
5356 	return skb;
5357 }
5358 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl);
5359 
ieee80211_pspoll_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5360 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
5361 				     struct ieee80211_vif *vif)
5362 {
5363 	struct ieee80211_sub_if_data *sdata;
5364 	struct ieee80211_if_managed *ifmgd;
5365 	struct ieee80211_pspoll *pspoll;
5366 	struct ieee80211_local *local;
5367 	struct sk_buff *skb;
5368 
5369 	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
5370 		return NULL;
5371 
5372 	sdata = vif_to_sdata(vif);
5373 	ifmgd = &sdata->u.mgd;
5374 	local = sdata->local;
5375 
5376 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
5377 	if (!skb)
5378 		return NULL;
5379 
5380 	skb_reserve(skb, local->hw.extra_tx_headroom);
5381 
5382 	pspoll = skb_put_zero(skb, sizeof(*pspoll));
5383 	pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
5384 					    IEEE80211_STYPE_PSPOLL);
5385 	pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid);
5386 
5387 	/* aid in PS-Poll has its two MSBs each set to 1 */
5388 	pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
5389 
5390 	memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
5391 	memcpy(pspoll->ta, vif->addr, ETH_ALEN);
5392 
5393 	return skb;
5394 }
5395 EXPORT_SYMBOL(ieee80211_pspoll_get);
5396 
ieee80211_nullfunc_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,bool qos_ok)5397 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
5398 				       struct ieee80211_vif *vif,
5399 				       bool qos_ok)
5400 {
5401 	struct ieee80211_hdr_3addr *nullfunc;
5402 	struct ieee80211_sub_if_data *sdata;
5403 	struct ieee80211_if_managed *ifmgd;
5404 	struct ieee80211_local *local;
5405 	struct sk_buff *skb;
5406 	bool qos = false;
5407 
5408 	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
5409 		return NULL;
5410 
5411 	sdata = vif_to_sdata(vif);
5412 	ifmgd = &sdata->u.mgd;
5413 	local = sdata->local;
5414 
5415 	if (qos_ok) {
5416 		struct sta_info *sta;
5417 
5418 		rcu_read_lock();
5419 		sta = sta_info_get(sdata, ifmgd->bssid);
5420 		qos = sta && sta->sta.wme;
5421 		rcu_read_unlock();
5422 	}
5423 
5424 	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
5425 			    sizeof(*nullfunc) + 2);
5426 	if (!skb)
5427 		return NULL;
5428 
5429 	skb_reserve(skb, local->hw.extra_tx_headroom);
5430 
5431 	nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
5432 	nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
5433 					      IEEE80211_STYPE_NULLFUNC |
5434 					      IEEE80211_FCTL_TODS);
5435 	if (qos) {
5436 		__le16 qoshdr = cpu_to_le16(7);
5437 
5438 		BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
5439 			      IEEE80211_STYPE_NULLFUNC) !=
5440 			     IEEE80211_STYPE_QOS_NULLFUNC);
5441 		nullfunc->frame_control |=
5442 			cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
5443 		skb->priority = 7;
5444 		skb_set_queue_mapping(skb, IEEE80211_AC_VO);
5445 		skb_put_data(skb, &qoshdr, sizeof(qoshdr));
5446 	}
5447 
5448 	memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
5449 	memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
5450 	memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
5451 
5452 	return skb;
5453 }
5454 EXPORT_SYMBOL(ieee80211_nullfunc_get);
5455 
ieee80211_probereq_get(struct ieee80211_hw * hw,const u8 * src_addr,const u8 * ssid,size_t ssid_len,size_t tailroom)5456 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
5457 				       const u8 *src_addr,
5458 				       const u8 *ssid, size_t ssid_len,
5459 				       size_t tailroom)
5460 {
5461 	struct ieee80211_local *local = hw_to_local(hw);
5462 	struct ieee80211_hdr_3addr *hdr;
5463 	struct sk_buff *skb;
5464 	size_t ie_ssid_len;
5465 	u8 *pos;
5466 
5467 	ie_ssid_len = 2 + ssid_len;
5468 
5469 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
5470 			    ie_ssid_len + tailroom);
5471 	if (!skb)
5472 		return NULL;
5473 
5474 	skb_reserve(skb, local->hw.extra_tx_headroom);
5475 
5476 	hdr = skb_put_zero(skb, sizeof(*hdr));
5477 	hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
5478 					 IEEE80211_STYPE_PROBE_REQ);
5479 	eth_broadcast_addr(hdr->addr1);
5480 	memcpy(hdr->addr2, src_addr, ETH_ALEN);
5481 	eth_broadcast_addr(hdr->addr3);
5482 
5483 	pos = skb_put(skb, ie_ssid_len);
5484 	*pos++ = WLAN_EID_SSID;
5485 	*pos++ = ssid_len;
5486 	if (ssid_len)
5487 		memcpy(pos, ssid, ssid_len);
5488 	pos += ssid_len;
5489 
5490 	return skb;
5491 }
5492 EXPORT_SYMBOL(ieee80211_probereq_get);
5493 
ieee80211_rts_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const void * frame,size_t frame_len,const struct ieee80211_tx_info * frame_txctl,struct ieee80211_rts * rts)5494 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5495 		       const void *frame, size_t frame_len,
5496 		       const struct ieee80211_tx_info *frame_txctl,
5497 		       struct ieee80211_rts *rts)
5498 {
5499 	const struct ieee80211_hdr *hdr = frame;
5500 
5501 	rts->frame_control =
5502 	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
5503 	rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
5504 					       frame_txctl);
5505 	memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
5506 	memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
5507 }
5508 EXPORT_SYMBOL(ieee80211_rts_get);
5509 
ieee80211_ctstoself_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const void * frame,size_t frame_len,const struct ieee80211_tx_info * frame_txctl,struct ieee80211_cts * cts)5510 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5511 			     const void *frame, size_t frame_len,
5512 			     const struct ieee80211_tx_info *frame_txctl,
5513 			     struct ieee80211_cts *cts)
5514 {
5515 	const struct ieee80211_hdr *hdr = frame;
5516 
5517 	cts->frame_control =
5518 	    cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
5519 	cts->duration = ieee80211_ctstoself_duration(hw, vif,
5520 						     frame_len, frame_txctl);
5521 	memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
5522 }
5523 EXPORT_SYMBOL(ieee80211_ctstoself_get);
5524 
5525 struct sk_buff *
ieee80211_get_buffered_bc(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5526 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
5527 			  struct ieee80211_vif *vif)
5528 {
5529 	struct ieee80211_local *local = hw_to_local(hw);
5530 	struct sk_buff *skb = NULL;
5531 	struct ieee80211_tx_data tx;
5532 	struct ieee80211_sub_if_data *sdata;
5533 	struct ps_data *ps;
5534 	struct ieee80211_tx_info *info;
5535 	struct ieee80211_chanctx_conf *chanctx_conf;
5536 
5537 	sdata = vif_to_sdata(vif);
5538 
5539 	rcu_read_lock();
5540 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
5541 
5542 	if (!chanctx_conf)
5543 		goto out;
5544 
5545 	if (sdata->vif.type == NL80211_IFTYPE_AP) {
5546 		struct beacon_data *beacon =
5547 				rcu_dereference(sdata->u.ap.beacon);
5548 
5549 		if (!beacon || !beacon->head)
5550 			goto out;
5551 
5552 		ps = &sdata->u.ap.ps;
5553 	} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
5554 		ps = &sdata->u.mesh.ps;
5555 	} else {
5556 		goto out;
5557 	}
5558 
5559 	if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
5560 		goto out; /* send buffered bc/mc only after DTIM beacon */
5561 
5562 	while (1) {
5563 		skb = skb_dequeue(&ps->bc_buf);
5564 		if (!skb)
5565 			goto out;
5566 		local->total_ps_buffered--;
5567 
5568 		if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
5569 			struct ieee80211_hdr *hdr =
5570 				(struct ieee80211_hdr *) skb->data;
5571 			/* more buffered multicast/broadcast frames ==> set
5572 			 * MoreData flag in IEEE 802.11 header to inform PS
5573 			 * STAs */
5574 			hdr->frame_control |=
5575 				cpu_to_le16(IEEE80211_FCTL_MOREDATA);
5576 		}
5577 
5578 		if (sdata->vif.type == NL80211_IFTYPE_AP)
5579 			sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
5580 		if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
5581 			break;
5582 		ieee80211_free_txskb(hw, skb);
5583 	}
5584 
5585 	info = IEEE80211_SKB_CB(skb);
5586 
5587 	tx.flags |= IEEE80211_TX_PS_BUFFERED;
5588 	info->band = chanctx_conf->def.chan->band;
5589 
5590 	if (invoke_tx_handlers(&tx))
5591 		skb = NULL;
5592  out:
5593 	rcu_read_unlock();
5594 
5595 	return skb;
5596 }
5597 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
5598 
ieee80211_reserve_tid(struct ieee80211_sta * pubsta,u8 tid)5599 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
5600 {
5601 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
5602 	struct ieee80211_sub_if_data *sdata = sta->sdata;
5603 	struct ieee80211_local *local = sdata->local;
5604 	int ret;
5605 	u32 queues;
5606 
5607 	lockdep_assert_held(&local->sta_mtx);
5608 
5609 	/* only some cases are supported right now */
5610 	switch (sdata->vif.type) {
5611 	case NL80211_IFTYPE_STATION:
5612 	case NL80211_IFTYPE_AP:
5613 	case NL80211_IFTYPE_AP_VLAN:
5614 		break;
5615 	default:
5616 		WARN_ON(1);
5617 		return -EINVAL;
5618 	}
5619 
5620 	if (WARN_ON(tid >= IEEE80211_NUM_UPS))
5621 		return -EINVAL;
5622 
5623 	if (sta->reserved_tid == tid) {
5624 		ret = 0;
5625 		goto out;
5626 	}
5627 
5628 	if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
5629 		sdata_err(sdata, "TID reservation already active\n");
5630 		ret = -EALREADY;
5631 		goto out;
5632 	}
5633 
5634 	ieee80211_stop_vif_queues(sdata->local, sdata,
5635 				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
5636 
5637 	synchronize_net();
5638 
5639 	/* Tear down BA sessions so we stop aggregating on this TID */
5640 	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
5641 		set_sta_flag(sta, WLAN_STA_BLOCK_BA);
5642 		__ieee80211_stop_tx_ba_session(sta, tid,
5643 					       AGG_STOP_LOCAL_REQUEST);
5644 	}
5645 
5646 	queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
5647 	__ieee80211_flush_queues(local, sdata, queues, false);
5648 
5649 	sta->reserved_tid = tid;
5650 
5651 	ieee80211_wake_vif_queues(local, sdata,
5652 				  IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
5653 
5654 	if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
5655 		clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
5656 
5657 	ret = 0;
5658  out:
5659 	return ret;
5660 }
5661 EXPORT_SYMBOL(ieee80211_reserve_tid);
5662 
ieee80211_unreserve_tid(struct ieee80211_sta * pubsta,u8 tid)5663 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
5664 {
5665 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
5666 	struct ieee80211_sub_if_data *sdata = sta->sdata;
5667 
5668 	lockdep_assert_held(&sdata->local->sta_mtx);
5669 
5670 	/* only some cases are supported right now */
5671 	switch (sdata->vif.type) {
5672 	case NL80211_IFTYPE_STATION:
5673 	case NL80211_IFTYPE_AP:
5674 	case NL80211_IFTYPE_AP_VLAN:
5675 		break;
5676 	default:
5677 		WARN_ON(1);
5678 		return;
5679 	}
5680 
5681 	if (tid != sta->reserved_tid) {
5682 		sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
5683 		return;
5684 	}
5685 
5686 	sta->reserved_tid = IEEE80211_TID_UNRESERVED;
5687 }
5688 EXPORT_SYMBOL(ieee80211_unreserve_tid);
5689 
__ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int tid,enum nl80211_band band)5690 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
5691 				 struct sk_buff *skb, int tid,
5692 				 enum nl80211_band band)
5693 {
5694 	int ac = ieee80211_ac_from_tid(tid);
5695 
5696 	skb_reset_mac_header(skb);
5697 	skb_set_queue_mapping(skb, ac);
5698 	skb->priority = tid;
5699 
5700 	skb->dev = sdata->dev;
5701 
5702 	/*
5703 	 * The other path calling ieee80211_xmit is from the tasklet,
5704 	 * and while we can handle concurrent transmissions locking
5705 	 * requirements are that we do not come into tx with bhs on.
5706 	 */
5707 	local_bh_disable();
5708 	IEEE80211_SKB_CB(skb)->band = band;
5709 	ieee80211_xmit(sdata, NULL, skb);
5710 	local_bh_enable();
5711 }
5712 
ieee80211_tx_control_port(struct wiphy * wiphy,struct net_device * dev,const u8 * buf,size_t len,const u8 * dest,__be16 proto,bool unencrypted,u64 * cookie)5713 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
5714 			      const u8 *buf, size_t len,
5715 			      const u8 *dest, __be16 proto, bool unencrypted,
5716 			      u64 *cookie)
5717 {
5718 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5719 	struct ieee80211_local *local = sdata->local;
5720 	struct sta_info *sta;
5721 	struct sk_buff *skb;
5722 	struct ethhdr *ehdr;
5723 	u32 ctrl_flags = 0;
5724 	u32 flags = 0;
5725 
5726 	/* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
5727 	 * or Pre-Authentication
5728 	 */
5729 	if (proto != sdata->control_port_protocol &&
5730 	    proto != cpu_to_be16(ETH_P_PREAUTH))
5731 		return -EINVAL;
5732 
5733 	if (proto == sdata->control_port_protocol)
5734 		ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO |
5735 			      IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
5736 
5737 	if (unencrypted)
5738 		flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
5739 
5740 	if (cookie)
5741 		ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
5742 
5743 	flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX;
5744 
5745 	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
5746 			    sizeof(struct ethhdr) + len);
5747 	if (!skb)
5748 		return -ENOMEM;
5749 
5750 	skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
5751 
5752 	skb_put_data(skb, buf, len);
5753 
5754 	ehdr = skb_push(skb, sizeof(struct ethhdr));
5755 	memcpy(ehdr->h_dest, dest, ETH_ALEN);
5756 	memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
5757 	ehdr->h_proto = proto;
5758 
5759 	skb->dev = dev;
5760 	skb->protocol = proto;
5761 	skb_reset_network_header(skb);
5762 	skb_reset_mac_header(skb);
5763 
5764 	/* update QoS header to prioritize control port frames if possible,
5765 	 * priorization also happens for control port frames send over
5766 	 * AF_PACKET
5767 	 */
5768 	rcu_read_lock();
5769 
5770 	if (ieee80211_lookup_ra_sta(sdata, skb, &sta) == 0 && !IS_ERR(sta)) {
5771 		u16 queue = __ieee80211_select_queue(sdata, sta, skb);
5772 
5773 		skb_set_queue_mapping(skb, queue);
5774 		skb_get_hash(skb);
5775 	}
5776 
5777 	rcu_read_unlock();
5778 
5779 	/* mutex lock is only needed for incrementing the cookie counter */
5780 	mutex_lock(&local->mtx);
5781 
5782 	local_bh_disable();
5783 	__ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie);
5784 	local_bh_enable();
5785 
5786 	mutex_unlock(&local->mtx);
5787 
5788 	return 0;
5789 }
5790 
ieee80211_probe_mesh_link(struct wiphy * wiphy,struct net_device * dev,const u8 * buf,size_t len)5791 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev,
5792 			      const u8 *buf, size_t len)
5793 {
5794 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5795 	struct ieee80211_local *local = sdata->local;
5796 	struct sk_buff *skb;
5797 
5798 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + len +
5799 			    30 + /* header size */
5800 			    18); /* 11s header size */
5801 	if (!skb)
5802 		return -ENOMEM;
5803 
5804 	skb_reserve(skb, local->hw.extra_tx_headroom);
5805 	skb_put_data(skb, buf, len);
5806 
5807 	skb->dev = dev;
5808 	skb->protocol = htons(ETH_P_802_3);
5809 	skb_reset_network_header(skb);
5810 	skb_reset_mac_header(skb);
5811 
5812 	local_bh_disable();
5813 	__ieee80211_subif_start_xmit(skb, skb->dev, 0,
5814 				     IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP,
5815 				     NULL);
5816 	local_bh_enable();
5817 
5818 	return 0;
5819 }
5820