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 2008-2010	Johannes Berg <johannes@sipsolutions.net>
7  * Copyright 2013-2014  Intel Mobile Communications GmbH
8  * Copyright 2021-2022  Intel Corporation
9  */
10 
11 #include <linux/export.h>
12 #include <linux/etherdevice.h>
13 #include <net/mac80211.h>
14 #include <asm/unaligned.h>
15 #include "ieee80211_i.h"
16 #include "rate.h"
17 #include "mesh.h"
18 #include "led.h"
19 #include "wme.h"
20 
21 
ieee80211_tx_status_irqsafe(struct ieee80211_hw * hw,struct sk_buff * skb)22 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
23 				 struct sk_buff *skb)
24 {
25 	struct ieee80211_local *local = hw_to_local(hw);
26 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
27 	int tmp;
28 
29 	skb->pkt_type = IEEE80211_TX_STATUS_MSG;
30 	skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
31 		       &local->skb_queue : &local->skb_queue_unreliable, skb);
32 	tmp = skb_queue_len(&local->skb_queue) +
33 		skb_queue_len(&local->skb_queue_unreliable);
34 	while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
35 	       (skb = skb_dequeue(&local->skb_queue_unreliable))) {
36 		ieee80211_free_txskb(hw, skb);
37 		tmp--;
38 		I802_DEBUG_INC(local->tx_status_drop);
39 	}
40 	tasklet_schedule(&local->tasklet);
41 }
42 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
43 
ieee80211_handle_filtered_frame(struct ieee80211_local * local,struct sta_info * sta,struct sk_buff * skb)44 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
45 					    struct sta_info *sta,
46 					    struct sk_buff *skb)
47 {
48 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
49 	struct ieee80211_hdr *hdr = (void *)skb->data;
50 	int ac;
51 
52 	if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
53 			   IEEE80211_TX_CTL_AMPDU |
54 			   IEEE80211_TX_CTL_HW_80211_ENCAP)) {
55 		ieee80211_free_txskb(&local->hw, skb);
56 		return;
57 	}
58 
59 	/*
60 	 * This skb 'survived' a round-trip through the driver, and
61 	 * hopefully the driver didn't mangle it too badly. However,
62 	 * we can definitely not rely on the control information
63 	 * being correct. Clear it so we don't get junk there, and
64 	 * indicate that it needs new processing, but must not be
65 	 * modified/encrypted again.
66 	 */
67 	memset(&info->control, 0, sizeof(info->control));
68 
69 	info->control.jiffies = jiffies;
70 	info->control.vif = &sta->sdata->vif;
71 	info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
72 	info->flags |= IEEE80211_TX_INTFL_RETRANSMISSION;
73 	info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
74 
75 	sta->deflink.status_stats.filtered++;
76 
77 	/*
78 	 * Clear more-data bit on filtered frames, it might be set
79 	 * but later frames might time out so it might have to be
80 	 * clear again ... It's all rather unlikely (this frame
81 	 * should time out first, right?) but let's not confuse
82 	 * peers unnecessarily.
83 	 */
84 	if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
85 		hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
86 
87 	if (ieee80211_is_data_qos(hdr->frame_control)) {
88 		u8 *p = ieee80211_get_qos_ctl(hdr);
89 		int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
90 
91 		/*
92 		 * Clear EOSP if set, this could happen e.g.
93 		 * if an absence period (us being a P2P GO)
94 		 * shortens the SP.
95 		 */
96 		if (*p & IEEE80211_QOS_CTL_EOSP)
97 			*p &= ~IEEE80211_QOS_CTL_EOSP;
98 		ac = ieee80211_ac_from_tid(tid);
99 	} else {
100 		ac = IEEE80211_AC_BE;
101 	}
102 
103 	/*
104 	 * Clear the TX filter mask for this STA when sending the next
105 	 * packet. If the STA went to power save mode, this will happen
106 	 * when it wakes up for the next time.
107 	 */
108 	set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
109 	ieee80211_clear_fast_xmit(sta);
110 
111 	/*
112 	 * This code races in the following way:
113 	 *
114 	 *  (1) STA sends frame indicating it will go to sleep and does so
115 	 *  (2) hardware/firmware adds STA to filter list, passes frame up
116 	 *  (3) hardware/firmware processes TX fifo and suppresses a frame
117 	 *  (4) we get TX status before having processed the frame and
118 	 *	knowing that the STA has gone to sleep.
119 	 *
120 	 * This is actually quite unlikely even when both those events are
121 	 * processed from interrupts coming in quickly after one another or
122 	 * even at the same time because we queue both TX status events and
123 	 * RX frames to be processed by a tasklet and process them in the
124 	 * same order that they were received or TX status last. Hence, there
125 	 * is no race as long as the frame RX is processed before the next TX
126 	 * status, which drivers can ensure, see below.
127 	 *
128 	 * Note that this can only happen if the hardware or firmware can
129 	 * actually add STAs to the filter list, if this is done by the
130 	 * driver in response to set_tim() (which will only reduce the race
131 	 * this whole filtering tries to solve, not completely solve it)
132 	 * this situation cannot happen.
133 	 *
134 	 * To completely solve this race drivers need to make sure that they
135 	 *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
136 	 *	functions and
137 	 *  (b) always process RX events before TX status events if ordering
138 	 *      can be unknown, for example with different interrupt status
139 	 *	bits.
140 	 *  (c) if PS mode transitions are manual (i.e. the flag
141 	 *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
142 	 *      changes before calling TX status events if ordering can be
143 	 *	unknown.
144 	 */
145 	if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
146 	    skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
147 		skb_queue_tail(&sta->tx_filtered[ac], skb);
148 		sta_info_recalc_tim(sta);
149 
150 		if (!timer_pending(&local->sta_cleanup))
151 			mod_timer(&local->sta_cleanup,
152 				  round_jiffies(jiffies +
153 						STA_INFO_CLEANUP_INTERVAL));
154 		return;
155 	}
156 
157 	if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
158 	    !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
159 		/* Software retry the packet once */
160 		info->flags |= IEEE80211_TX_INTFL_RETRIED;
161 		ieee80211_add_pending_skb(local, skb);
162 		return;
163 	}
164 
165 	ps_dbg_ratelimited(sta->sdata,
166 			   "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
167 			   skb_queue_len(&sta->tx_filtered[ac]),
168 			   !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
169 	ieee80211_free_txskb(&local->hw, skb);
170 }
171 
ieee80211_check_pending_bar(struct sta_info * sta,u8 * addr,u8 tid)172 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
173 {
174 	struct tid_ampdu_tx *tid_tx;
175 
176 	tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
177 	if (!tid_tx || !tid_tx->bar_pending)
178 		return;
179 
180 	tid_tx->bar_pending = false;
181 	ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
182 }
183 
ieee80211_frame_acked(struct sta_info * sta,struct sk_buff * skb)184 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
185 {
186 	struct ieee80211_mgmt *mgmt = (void *) skb->data;
187 	struct ieee80211_local *local = sta->local;
188 	struct ieee80211_sub_if_data *sdata = sta->sdata;
189 
190 	if (ieee80211_is_data_qos(mgmt->frame_control)) {
191 		struct ieee80211_hdr *hdr = (void *) skb->data;
192 		u8 *qc = ieee80211_get_qos_ctl(hdr);
193 		u16 tid = qc[0] & 0xf;
194 
195 		ieee80211_check_pending_bar(sta, hdr->addr1, tid);
196 	}
197 
198 	if (ieee80211_is_action(mgmt->frame_control) &&
199 	    !ieee80211_has_protected(mgmt->frame_control) &&
200 	    mgmt->u.action.category == WLAN_CATEGORY_HT &&
201 	    mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
202 	    ieee80211_sdata_running(sdata)) {
203 		enum ieee80211_smps_mode smps_mode;
204 
205 		switch (mgmt->u.action.u.ht_smps.smps_control) {
206 		case WLAN_HT_SMPS_CONTROL_DYNAMIC:
207 			smps_mode = IEEE80211_SMPS_DYNAMIC;
208 			break;
209 		case WLAN_HT_SMPS_CONTROL_STATIC:
210 			smps_mode = IEEE80211_SMPS_STATIC;
211 			break;
212 		case WLAN_HT_SMPS_CONTROL_DISABLED:
213 		default: /* shouldn't happen since we don't send that */
214 			smps_mode = IEEE80211_SMPS_OFF;
215 			break;
216 		}
217 
218 		if (sdata->vif.type == NL80211_IFTYPE_STATION) {
219 			/*
220 			 * This update looks racy, but isn't -- if we come
221 			 * here we've definitely got a station that we're
222 			 * talking to, and on a managed interface that can
223 			 * only be the AP. And the only other place updating
224 			 * this variable in managed mode is before association.
225 			 */
226 			sdata->deflink.smps_mode = smps_mode;
227 			ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
228 		}
229 	}
230 }
231 
ieee80211_set_bar_pending(struct sta_info * sta,u8 tid,u16 ssn)232 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
233 {
234 	struct tid_ampdu_tx *tid_tx;
235 
236 	tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
237 	if (!tid_tx)
238 		return;
239 
240 	tid_tx->failed_bar_ssn = ssn;
241 	tid_tx->bar_pending = true;
242 }
243 
ieee80211_tx_radiotap_len(struct ieee80211_tx_info * info,struct ieee80211_tx_status * status)244 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
245 				     struct ieee80211_tx_status *status)
246 {
247 	struct ieee80211_rate_status *status_rate = NULL;
248 	int len = sizeof(struct ieee80211_radiotap_header);
249 
250 	if (status && status->n_rates)
251 		status_rate = &status->rates[status->n_rates - 1];
252 
253 	/* IEEE80211_RADIOTAP_RATE rate */
254 	if (status_rate && !(status_rate->rate_idx.flags &
255 						(RATE_INFO_FLAGS_MCS |
256 						 RATE_INFO_FLAGS_DMG |
257 						 RATE_INFO_FLAGS_EDMG |
258 						 RATE_INFO_FLAGS_VHT_MCS |
259 						 RATE_INFO_FLAGS_HE_MCS)))
260 		len += 2;
261 	else if (info->status.rates[0].idx >= 0 &&
262 		 !(info->status.rates[0].flags &
263 		   (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
264 		len += 2;
265 
266 	/* IEEE80211_RADIOTAP_TX_FLAGS */
267 	len += 2;
268 
269 	/* IEEE80211_RADIOTAP_DATA_RETRIES */
270 	len += 1;
271 
272 	/* IEEE80211_RADIOTAP_MCS
273 	 * IEEE80211_RADIOTAP_VHT */
274 	if (status_rate) {
275 		if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_MCS)
276 			len += 3;
277 		else if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_VHT_MCS)
278 			len = ALIGN(len, 2) + 12;
279 		else if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_HE_MCS)
280 			len = ALIGN(len, 2) + 12;
281 	} else if (info->status.rates[0].idx >= 0) {
282 		if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
283 			len += 3;
284 		else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
285 			len = ALIGN(len, 2) + 12;
286 	}
287 
288 	return len;
289 }
290 
291 static void
ieee80211_add_tx_radiotap_header(struct ieee80211_local * local,struct sk_buff * skb,int retry_count,int rtap_len,int shift,struct ieee80211_tx_status * status)292 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
293 				 struct sk_buff *skb, int retry_count,
294 				 int rtap_len, int shift,
295 				 struct ieee80211_tx_status *status)
296 {
297 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
298 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
299 	struct ieee80211_radiotap_header *rthdr;
300 	struct ieee80211_rate_status *status_rate = NULL;
301 	unsigned char *pos;
302 	u16 legacy_rate = 0;
303 	u16 txflags;
304 
305 	if (status && status->n_rates)
306 		status_rate = &status->rates[status->n_rates - 1];
307 
308 	rthdr = skb_push(skb, rtap_len);
309 
310 	memset(rthdr, 0, rtap_len);
311 	rthdr->it_len = cpu_to_le16(rtap_len);
312 	rthdr->it_present =
313 		cpu_to_le32(BIT(IEEE80211_RADIOTAP_TX_FLAGS) |
314 			    BIT(IEEE80211_RADIOTAP_DATA_RETRIES));
315 	pos = (unsigned char *)(rthdr + 1);
316 
317 	/*
318 	 * XXX: Once radiotap gets the bitmap reset thing the vendor
319 	 *	extensions proposal contains, we can actually report
320 	 *	the whole set of tries we did.
321 	 */
322 
323 	/* IEEE80211_RADIOTAP_RATE */
324 
325 	if (status_rate) {
326 		if (!(status_rate->rate_idx.flags &
327 						(RATE_INFO_FLAGS_MCS |
328 						 RATE_INFO_FLAGS_DMG |
329 						 RATE_INFO_FLAGS_EDMG |
330 						 RATE_INFO_FLAGS_VHT_MCS |
331 						 RATE_INFO_FLAGS_HE_MCS)))
332 			legacy_rate = status_rate->rate_idx.legacy;
333 	} else if (info->status.rates[0].idx >= 0 &&
334 		 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
335 						  IEEE80211_TX_RC_VHT_MCS))) {
336 		struct ieee80211_supported_band *sband;
337 
338 		sband = local->hw.wiphy->bands[info->band];
339 		legacy_rate =
340 			sband->bitrates[info->status.rates[0].idx].bitrate;
341 	}
342 
343 	if (legacy_rate) {
344 		rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
345 		*pos = DIV_ROUND_UP(legacy_rate, 5 * (1 << shift));
346 		/* padding for tx flags */
347 		pos += 2;
348 	}
349 
350 	/* IEEE80211_RADIOTAP_TX_FLAGS */
351 	txflags = 0;
352 	if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
353 	    !is_multicast_ether_addr(hdr->addr1))
354 		txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
355 
356 	if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
357 		txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
358 	if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
359 		txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
360 
361 	put_unaligned_le16(txflags, pos);
362 	pos += 2;
363 
364 	/* IEEE80211_RADIOTAP_DATA_RETRIES */
365 	/* for now report the total retry_count */
366 	*pos = retry_count;
367 	pos++;
368 
369 	if (status_rate && (status_rate->rate_idx.flags & RATE_INFO_FLAGS_MCS))
370 	{
371 		rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
372 		pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
373 			 IEEE80211_RADIOTAP_MCS_HAVE_GI |
374 			 IEEE80211_RADIOTAP_MCS_HAVE_BW;
375 		if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_SHORT_GI)
376 			pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
377 		if (status_rate->rate_idx.bw == RATE_INFO_BW_40)
378 			pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
379 		pos[2] = status_rate->rate_idx.mcs;
380 		pos += 3;
381 	} else if (status_rate && (status_rate->rate_idx.flags &
382 					RATE_INFO_FLAGS_VHT_MCS))
383 	{
384 		u16 known = local->hw.radiotap_vht_details &
385 			(IEEE80211_RADIOTAP_VHT_KNOWN_GI |
386 			 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
387 
388 		rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
389 
390 		/* required alignment from rthdr */
391 		pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
392 
393 		/* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
394 		put_unaligned_le16(known, pos);
395 		pos += 2;
396 
397 		/* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
398 		if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_SHORT_GI)
399 			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
400 		pos++;
401 
402 		/* u8 bandwidth */
403 		switch (status_rate->rate_idx.bw) {
404 		case RATE_INFO_BW_160:
405 			*pos = 11;
406 			break;
407 		case RATE_INFO_BW_80:
408 			*pos = 4;
409 			break;
410 		case RATE_INFO_BW_40:
411 			*pos = 1;
412 			break;
413 		default:
414 			*pos = 0;
415 			break;
416 		}
417 		pos++;
418 
419 		/* u8 mcs_nss[4] */
420 		*pos = (status_rate->rate_idx.mcs << 4) |
421 				status_rate->rate_idx.nss;
422 		pos += 4;
423 
424 		/* u8 coding */
425 		pos++;
426 		/* u8 group_id */
427 		pos++;
428 		/* u16 partial_aid */
429 		pos += 2;
430 	} else if (status_rate && (status_rate->rate_idx.flags &
431 					RATE_INFO_FLAGS_HE_MCS))
432 	{
433 		struct ieee80211_radiotap_he *he;
434 
435 		rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
436 
437 		/* required alignment from rthdr */
438 		pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
439 		he = (struct ieee80211_radiotap_he *)pos;
440 
441 		he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
442 					IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
443 					IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
444 					IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
445 
446 		he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
447 
448 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
449 
450 		he->data6 |= HE_PREP(DATA6_NSTS, status_rate->rate_idx.nss);
451 
452 #define CHECK_GI(s) \
453 	BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
454 	(int)NL80211_RATE_INFO_HE_GI_##s)
455 
456 		CHECK_GI(0_8);
457 		CHECK_GI(1_6);
458 		CHECK_GI(3_2);
459 
460 		he->data3 |= HE_PREP(DATA3_DATA_MCS, status_rate->rate_idx.mcs);
461 		he->data3 |= HE_PREP(DATA3_DATA_DCM, status_rate->rate_idx.he_dcm);
462 
463 		he->data5 |= HE_PREP(DATA5_GI, status_rate->rate_idx.he_gi);
464 
465 		switch (status_rate->rate_idx.bw) {
466 		case RATE_INFO_BW_20:
467 			he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
468 					     IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
469 			break;
470 		case RATE_INFO_BW_40:
471 			he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
472 					     IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
473 			break;
474 		case RATE_INFO_BW_80:
475 			he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
476 					     IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
477 			break;
478 		case RATE_INFO_BW_160:
479 			he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
480 					     IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
481 			break;
482 		case RATE_INFO_BW_HE_RU:
483 #define CHECK_RU_ALLOC(s) \
484 	BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
485 	NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
486 
487 			CHECK_RU_ALLOC(26);
488 			CHECK_RU_ALLOC(52);
489 			CHECK_RU_ALLOC(106);
490 			CHECK_RU_ALLOC(242);
491 			CHECK_RU_ALLOC(484);
492 			CHECK_RU_ALLOC(996);
493 			CHECK_RU_ALLOC(2x996);
494 
495 			he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
496 					     status_rate->rate_idx.he_ru_alloc + 4);
497 			break;
498 		default:
499 			WARN_ONCE(1, "Invalid SU BW %d\n", status_rate->rate_idx.bw);
500 		}
501 
502 		pos += sizeof(struct ieee80211_radiotap_he);
503 	}
504 
505 	if (status_rate || info->status.rates[0].idx < 0)
506 		return;
507 
508 	/* IEEE80211_RADIOTAP_MCS
509 	 * IEEE80211_RADIOTAP_VHT */
510 	if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
511 		rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
512 		pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
513 			 IEEE80211_RADIOTAP_MCS_HAVE_GI |
514 			 IEEE80211_RADIOTAP_MCS_HAVE_BW;
515 		if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
516 			pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
517 		if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
518 			pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
519 		if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
520 			pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
521 		pos[2] = info->status.rates[0].idx;
522 		pos += 3;
523 	} else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
524 		u16 known = local->hw.radiotap_vht_details &
525 			(IEEE80211_RADIOTAP_VHT_KNOWN_GI |
526 			 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
527 
528 		rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
529 
530 		/* required alignment from rthdr */
531 		pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
532 
533 		/* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
534 		put_unaligned_le16(known, pos);
535 		pos += 2;
536 
537 		/* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
538 		if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
539 			*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
540 		pos++;
541 
542 		/* u8 bandwidth */
543 		if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
544 			*pos = 1;
545 		else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
546 			*pos = 4;
547 		else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
548 			*pos = 11;
549 		else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
550 			*pos = 0;
551 		pos++;
552 
553 		/* u8 mcs_nss[4] */
554 		*pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
555 			ieee80211_rate_get_vht_nss(&info->status.rates[0]);
556 		pos += 4;
557 
558 		/* u8 coding */
559 		pos++;
560 		/* u8 group_id */
561 		pos++;
562 		/* u16 partial_aid */
563 		pos += 2;
564 	}
565 }
566 
567 /*
568  * Handles the tx for TDLS teardown frames.
569  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
570  */
ieee80211_tdls_td_tx_handle(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 flags)571 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
572 					struct ieee80211_sub_if_data *sdata,
573 					struct sk_buff *skb, u32 flags)
574 {
575 	struct sk_buff *teardown_skb;
576 	struct sk_buff *orig_teardown_skb;
577 	bool is_teardown = false;
578 
579 	/* Get the teardown data we need and free the lock */
580 	spin_lock(&sdata->u.mgd.teardown_lock);
581 	teardown_skb = sdata->u.mgd.teardown_skb;
582 	orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
583 	if ((skb == orig_teardown_skb) && teardown_skb) {
584 		sdata->u.mgd.teardown_skb = NULL;
585 		sdata->u.mgd.orig_teardown_skb = NULL;
586 		is_teardown = true;
587 	}
588 	spin_unlock(&sdata->u.mgd.teardown_lock);
589 
590 	if (is_teardown) {
591 		/* This mechanism relies on being able to get ACKs */
592 		WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
593 
594 		/* Check if peer has ACKed */
595 		if (flags & IEEE80211_TX_STAT_ACK) {
596 			dev_kfree_skb_any(teardown_skb);
597 		} else {
598 			tdls_dbg(sdata,
599 				 "TDLS Resending teardown through AP\n");
600 
601 			ieee80211_subif_start_xmit(teardown_skb, skb->dev);
602 		}
603 	}
604 }
605 
606 static struct ieee80211_sub_if_data *
ieee80211_sdata_from_skb(struct ieee80211_local * local,struct sk_buff * skb)607 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
608 {
609 	struct ieee80211_sub_if_data *sdata;
610 
611 	if (skb->dev) {
612 		list_for_each_entry_rcu(sdata, &local->interfaces, list) {
613 			if (!sdata->dev)
614 				continue;
615 
616 			if (skb->dev == sdata->dev)
617 				return sdata;
618 		}
619 
620 		return NULL;
621 	}
622 
623 	return rcu_dereference(local->p2p_sdata);
624 }
625 
ieee80211_report_ack_skb(struct ieee80211_local * local,struct sk_buff * orig_skb,bool acked,bool dropped,ktime_t ack_hwtstamp)626 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
627 				     struct sk_buff *orig_skb,
628 				     bool acked, bool dropped,
629 				     ktime_t ack_hwtstamp)
630 {
631 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(orig_skb);
632 	struct sk_buff *skb;
633 	unsigned long flags;
634 
635 	spin_lock_irqsave(&local->ack_status_lock, flags);
636 	skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
637 	spin_unlock_irqrestore(&local->ack_status_lock, flags);
638 
639 	if (!skb)
640 		return;
641 
642 	if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
643 		u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
644 		struct ieee80211_sub_if_data *sdata;
645 		struct ieee80211_hdr *hdr = (void *)skb->data;
646 		bool is_valid_ack_signal =
647 			!!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
648 		struct cfg80211_tx_status status = {
649 			.cookie = cookie,
650 			.buf = skb->data,
651 			.len = skb->len,
652 			.ack = acked,
653 		};
654 
655 		if (ieee80211_is_timing_measurement(orig_skb) ||
656 		    ieee80211_is_ftm(orig_skb)) {
657 			status.tx_tstamp =
658 				ktime_to_ns(skb_hwtstamps(orig_skb)->hwtstamp);
659 			status.ack_tstamp = ktime_to_ns(ack_hwtstamp);
660 		}
661 
662 		rcu_read_lock();
663 		sdata = ieee80211_sdata_from_skb(local, skb);
664 		if (sdata) {
665 			if (skb->protocol == sdata->control_port_protocol ||
666 			    skb->protocol == cpu_to_be16(ETH_P_PREAUTH))
667 				cfg80211_control_port_tx_status(&sdata->wdev,
668 								cookie,
669 								skb->data,
670 								skb->len,
671 								acked,
672 								GFP_ATOMIC);
673 			else if (ieee80211_is_any_nullfunc(hdr->frame_control))
674 				cfg80211_probe_status(sdata->dev, hdr->addr1,
675 						      cookie, acked,
676 						      info->status.ack_signal,
677 						      is_valid_ack_signal,
678 						      GFP_ATOMIC);
679 			else if (ieee80211_is_mgmt(hdr->frame_control))
680 				cfg80211_mgmt_tx_status_ext(&sdata->wdev,
681 							    &status,
682 							    GFP_ATOMIC);
683 			else
684 				pr_warn("Unknown status report in ack skb\n");
685 
686 		}
687 		rcu_read_unlock();
688 
689 		dev_kfree_skb_any(skb);
690 	} else if (dropped) {
691 		dev_kfree_skb_any(skb);
692 	} else {
693 		/* consumes skb */
694 		skb_complete_wifi_ack(skb, acked);
695 	}
696 }
697 
ieee80211_report_used_skb(struct ieee80211_local * local,struct sk_buff * skb,bool dropped,ktime_t ack_hwtstamp)698 static void ieee80211_report_used_skb(struct ieee80211_local *local,
699 				      struct sk_buff *skb, bool dropped,
700 				      ktime_t ack_hwtstamp)
701 {
702 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
703 	u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
704 	struct ieee80211_hdr *hdr = (void *)skb->data;
705 	bool acked = info->flags & IEEE80211_TX_STAT_ACK;
706 
707 	if (dropped)
708 		acked = false;
709 
710 	if (tx_time_est) {
711 		struct sta_info *sta;
712 
713 		rcu_read_lock();
714 
715 		sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
716 		ieee80211_sta_update_pending_airtime(local, sta,
717 						     skb_get_queue_mapping(skb),
718 						     tx_time_est,
719 						     true);
720 		rcu_read_unlock();
721 	}
722 
723 	if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
724 		struct ieee80211_sub_if_data *sdata;
725 
726 		rcu_read_lock();
727 
728 		sdata = ieee80211_sdata_from_skb(local, skb);
729 
730 		if (!sdata) {
731 			skb->dev = NULL;
732 		} else if (!dropped) {
733 			unsigned int hdr_size =
734 				ieee80211_hdrlen(hdr->frame_control);
735 
736 			/* Check to see if packet is a TDLS teardown packet */
737 			if (ieee80211_is_data(hdr->frame_control) &&
738 			    (ieee80211_get_tdls_action(skb, hdr_size) ==
739 			     WLAN_TDLS_TEARDOWN)) {
740 				ieee80211_tdls_td_tx_handle(local, sdata, skb,
741 							    info->flags);
742 			} else if (ieee80211_s1g_is_twt_setup(skb)) {
743 				if (!acked) {
744 					struct sk_buff *qskb;
745 
746 					qskb = skb_clone(skb, GFP_ATOMIC);
747 					if (qskb) {
748 						skb_queue_tail(&sdata->status_queue,
749 							       qskb);
750 						ieee80211_queue_work(&local->hw,
751 								     &sdata->work);
752 					}
753 				}
754 			} else {
755 				ieee80211_mgd_conn_tx_status(sdata,
756 							     hdr->frame_control,
757 							     acked);
758 			}
759 		}
760 
761 		rcu_read_unlock();
762 	} else if (info->ack_frame_id) {
763 		ieee80211_report_ack_skb(local, skb, acked, dropped,
764 					 ack_hwtstamp);
765 	}
766 
767 	if (!dropped && skb->destructor) {
768 		skb->wifi_acked_valid = 1;
769 		skb->wifi_acked = acked;
770 	}
771 
772 	ieee80211_led_tx(local);
773 
774 	if (skb_has_frag_list(skb)) {
775 		kfree_skb_list(skb_shinfo(skb)->frag_list);
776 		skb_shinfo(skb)->frag_list = NULL;
777 	}
778 }
779 
780 /*
781  * Use a static threshold for now, best value to be determined
782  * by testing ...
783  * Should it depend on:
784  *  - on # of retransmissions
785  *  - current throughput (higher value for higher tpt)?
786  */
787 #define STA_LOST_PKT_THRESHOLD	50
788 #define STA_LOST_PKT_TIME	HZ		/* 1 sec since last ACK */
789 #define STA_LOST_TDLS_PKT_TIME		(10*HZ) /* 10secs since last ACK */
790 
ieee80211_lost_packet(struct sta_info * sta,struct ieee80211_tx_info * info)791 static void ieee80211_lost_packet(struct sta_info *sta,
792 				  struct ieee80211_tx_info *info)
793 {
794 	unsigned long pkt_time = STA_LOST_PKT_TIME;
795 	unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
796 
797 	/* If driver relies on its own algorithm for station kickout, skip
798 	 * mac80211 packet loss mechanism.
799 	 */
800 	if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
801 		return;
802 
803 	/* This packet was aggregated but doesn't carry status info */
804 	if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
805 	    !(info->flags & IEEE80211_TX_STAT_AMPDU))
806 		return;
807 
808 	sta->deflink.status_stats.lost_packets++;
809 	if (sta->sta.tdls) {
810 		pkt_time = STA_LOST_TDLS_PKT_TIME;
811 		pkt_thr = STA_LOST_PKT_THRESHOLD;
812 	}
813 
814 	/*
815 	 * If we're in TDLS mode, make sure that all STA_LOST_PKT_THRESHOLD
816 	 * of the last packets were lost, and that no ACK was received in the
817 	 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
818 	 * mechanism.
819 	 * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
820 	 */
821 	if (sta->deflink.status_stats.lost_packets < pkt_thr ||
822 	    !time_after(jiffies, sta->deflink.status_stats.last_pkt_time + pkt_time))
823 		return;
824 
825 	cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
826 				    sta->deflink.status_stats.lost_packets,
827 				    GFP_ATOMIC);
828 	sta->deflink.status_stats.lost_packets = 0;
829 }
830 
ieee80211_tx_get_rates(struct ieee80211_hw * hw,struct ieee80211_tx_info * info,int * retry_count)831 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
832 				  struct ieee80211_tx_info *info,
833 				  int *retry_count)
834 {
835 	int count = -1;
836 	int i;
837 
838 	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
839 		if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
840 		    !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
841 			/* just the first aggr frame carry status info */
842 			info->status.rates[i].idx = -1;
843 			info->status.rates[i].count = 0;
844 			break;
845 		} else if (info->status.rates[i].idx < 0) {
846 			break;
847 		} else if (i >= hw->max_report_rates) {
848 			/* the HW cannot have attempted that rate */
849 			info->status.rates[i].idx = -1;
850 			info->status.rates[i].count = 0;
851 			break;
852 		}
853 
854 		count += info->status.rates[i].count;
855 	}
856 
857 	if (count < 0)
858 		count = 0;
859 
860 	*retry_count = count;
861 	return i - 1;
862 }
863 
ieee80211_tx_monitor(struct ieee80211_local * local,struct sk_buff * skb,int retry_count,int shift,bool send_to_cooked,struct ieee80211_tx_status * status)864 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
865 			  int retry_count, int shift, bool send_to_cooked,
866 			  struct ieee80211_tx_status *status)
867 {
868 	struct sk_buff *skb2;
869 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
870 	struct ieee80211_sub_if_data *sdata;
871 	struct net_device *prev_dev = NULL;
872 	int rtap_len;
873 
874 	/* send frame to monitor interfaces now */
875 	rtap_len = ieee80211_tx_radiotap_len(info, status);
876 	if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
877 		pr_err("ieee80211_tx_status: headroom too small\n");
878 		dev_kfree_skb(skb);
879 		return;
880 	}
881 	ieee80211_add_tx_radiotap_header(local, skb, retry_count,
882 					 rtap_len, shift, status);
883 
884 	/* XXX: is this sufficient for BPF? */
885 	skb_reset_mac_header(skb);
886 	skb->ip_summed = CHECKSUM_UNNECESSARY;
887 	skb->pkt_type = PACKET_OTHERHOST;
888 	skb->protocol = htons(ETH_P_802_2);
889 	memset(skb->cb, 0, sizeof(skb->cb));
890 
891 	rcu_read_lock();
892 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
893 		if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
894 			if (!ieee80211_sdata_running(sdata))
895 				continue;
896 
897 			if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
898 			    !send_to_cooked)
899 				continue;
900 
901 			if (prev_dev) {
902 				skb2 = skb_clone(skb, GFP_ATOMIC);
903 				if (skb2) {
904 					skb2->dev = prev_dev;
905 					netif_rx(skb2);
906 				}
907 			}
908 
909 			prev_dev = sdata->dev;
910 		}
911 	}
912 	if (prev_dev) {
913 		skb->dev = prev_dev;
914 		netif_rx(skb);
915 		skb = NULL;
916 	}
917 	rcu_read_unlock();
918 	dev_kfree_skb(skb);
919 }
920 
__ieee80211_tx_status(struct ieee80211_hw * hw,struct ieee80211_tx_status * status,int rates_idx,int retry_count)921 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
922 				  struct ieee80211_tx_status *status,
923 				  int rates_idx, int retry_count)
924 {
925 	struct sk_buff *skb = status->skb;
926 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
927 	struct ieee80211_local *local = hw_to_local(hw);
928 	struct ieee80211_tx_info *info = status->info;
929 	struct sta_info *sta;
930 	__le16 fc;
931 	bool send_to_cooked;
932 	bool acked;
933 	bool noack_success;
934 	struct ieee80211_bar *bar;
935 	int shift = 0;
936 	int tid = IEEE80211_NUM_TIDS;
937 
938 	fc = hdr->frame_control;
939 
940 	if (status->sta) {
941 		sta = container_of(status->sta, struct sta_info, sta);
942 		shift = ieee80211_vif_get_shift(&sta->sdata->vif);
943 
944 		if (info->flags & IEEE80211_TX_STATUS_EOSP)
945 			clear_sta_flag(sta, WLAN_STA_SP);
946 
947 		acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
948 		noack_success = !!(info->flags &
949 				   IEEE80211_TX_STAT_NOACK_TRANSMITTED);
950 
951 		/* mesh Peer Service Period support */
952 		if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
953 		    ieee80211_is_data_qos(fc))
954 			ieee80211_mpsp_trigger_process(
955 				ieee80211_get_qos_ctl(hdr), sta, true, acked);
956 
957 		if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
958 		    (ieee80211_is_data(hdr->frame_control)) &&
959 		    (rates_idx != -1))
960 			sta->deflink.tx_stats.last_rate =
961 				info->status.rates[rates_idx];
962 
963 		if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
964 		    (ieee80211_is_data_qos(fc))) {
965 			u16 ssn;
966 			u8 *qc;
967 
968 			qc = ieee80211_get_qos_ctl(hdr);
969 			tid = qc[0] & 0xf;
970 			ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
971 						& IEEE80211_SCTL_SEQ);
972 			ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
973 					   tid, ssn);
974 		} else if (ieee80211_is_data_qos(fc)) {
975 			u8 *qc = ieee80211_get_qos_ctl(hdr);
976 
977 			tid = qc[0] & 0xf;
978 		}
979 
980 		if (!acked && ieee80211_is_back_req(fc)) {
981 			u16 control;
982 
983 			/*
984 			 * BAR failed, store the last SSN and retry sending
985 			 * the BAR when the next unicast transmission on the
986 			 * same TID succeeds.
987 			 */
988 			bar = (struct ieee80211_bar *) skb->data;
989 			control = le16_to_cpu(bar->control);
990 			if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
991 				u16 ssn = le16_to_cpu(bar->start_seq_num);
992 
993 				tid = (control &
994 				       IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
995 				      IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
996 
997 				ieee80211_set_bar_pending(sta, tid, ssn);
998 			}
999 		}
1000 
1001 		if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1002 			ieee80211_handle_filtered_frame(local, sta, skb);
1003 			return;
1004 		} else if (ieee80211_is_data_present(fc)) {
1005 			if (!acked && !noack_success)
1006 				sta->deflink.status_stats.msdu_failed[tid]++;
1007 
1008 			sta->deflink.status_stats.msdu_retries[tid] +=
1009 				retry_count;
1010 		}
1011 
1012 		if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
1013 			ieee80211_frame_acked(sta, skb);
1014 
1015 	}
1016 
1017 	/* SNMP counters
1018 	 * Fragments are passed to low-level drivers as separate skbs, so these
1019 	 * are actually fragments, not frames. Update frame counters only for
1020 	 * the first fragment of the frame. */
1021 	if ((info->flags & IEEE80211_TX_STAT_ACK) ||
1022 	    (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1023 		if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1024 			I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1025 			if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1026 				I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1027 			if (retry_count > 0)
1028 				I802_DEBUG_INC(local->dot11RetryCount);
1029 			if (retry_count > 1)
1030 				I802_DEBUG_INC(local->dot11MultipleRetryCount);
1031 		}
1032 
1033 		/* This counter shall be incremented for an acknowledged MPDU
1034 		 * with an individual address in the address 1 field or an MPDU
1035 		 * with a multicast address in the address 1 field of type Data
1036 		 * or Management. */
1037 		if (!is_multicast_ether_addr(hdr->addr1) ||
1038 		    ieee80211_is_data(fc) ||
1039 		    ieee80211_is_mgmt(fc))
1040 			I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1041 	} else {
1042 		if (ieee80211_is_first_frag(hdr->seq_ctrl))
1043 			I802_DEBUG_INC(local->dot11FailedCount);
1044 	}
1045 
1046 	if (ieee80211_is_any_nullfunc(fc) &&
1047 	    ieee80211_has_pm(fc) &&
1048 	    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1049 	    !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1050 	    local->ps_sdata && !(local->scanning)) {
1051 		if (info->flags & IEEE80211_TX_STAT_ACK)
1052 			local->ps_sdata->u.mgd.flags |=
1053 					IEEE80211_STA_NULLFUNC_ACKED;
1054 		mod_timer(&local->dynamic_ps_timer,
1055 			  jiffies + msecs_to_jiffies(10));
1056 	}
1057 
1058 	ieee80211_report_used_skb(local, skb, false, status->ack_hwtstamp);
1059 
1060 	/* this was a transmitted frame, but now we want to reuse it */
1061 	skb_orphan(skb);
1062 
1063 	/* Need to make a copy before skb->cb gets cleared */
1064 	send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1065 			 !(ieee80211_is_data(fc));
1066 
1067 	/*
1068 	 * This is a bit racy but we can avoid a lot of work
1069 	 * with this test...
1070 	 */
1071 	if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
1072 		if (status->free_list)
1073 			list_add_tail(&skb->list, status->free_list);
1074 		else
1075 			dev_kfree_skb(skb);
1076 		return;
1077 	}
1078 
1079 	/* send to monitor interfaces */
1080 	ieee80211_tx_monitor(local, skb, retry_count, shift,
1081 			     send_to_cooked, status);
1082 }
1083 
ieee80211_tx_status(struct ieee80211_hw * hw,struct sk_buff * skb)1084 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1085 {
1086 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1087 	struct ieee80211_local *local = hw_to_local(hw);
1088 	struct ieee80211_tx_status status = {
1089 		.skb = skb,
1090 		.info = IEEE80211_SKB_CB(skb),
1091 	};
1092 	struct sta_info *sta;
1093 
1094 	rcu_read_lock();
1095 
1096 	sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1097 	if (sta)
1098 		status.sta = &sta->sta;
1099 
1100 	ieee80211_tx_status_ext(hw, &status);
1101 	rcu_read_unlock();
1102 }
1103 EXPORT_SYMBOL(ieee80211_tx_status);
1104 
ieee80211_tx_status_ext(struct ieee80211_hw * hw,struct ieee80211_tx_status * status)1105 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1106 			     struct ieee80211_tx_status *status)
1107 {
1108 	struct ieee80211_local *local = hw_to_local(hw);
1109 	struct ieee80211_tx_info *info = status->info;
1110 	struct ieee80211_sta *pubsta = status->sta;
1111 	struct sk_buff *skb = status->skb;
1112 	struct sta_info *sta = NULL;
1113 	int rates_idx, retry_count;
1114 	bool acked, noack_success, ack_signal_valid;
1115 	u16 tx_time_est;
1116 
1117 	if (pubsta) {
1118 		sta = container_of(pubsta, struct sta_info, sta);
1119 
1120 		if (status->n_rates)
1121 			sta->deflink.tx_stats.last_rate_info =
1122 				status->rates[status->n_rates - 1].rate_idx;
1123 	}
1124 
1125 	if (skb && (tx_time_est =
1126 		    ieee80211_info_get_tx_time_est(IEEE80211_SKB_CB(skb))) > 0) {
1127 		/* Do this here to avoid the expensive lookup of the sta
1128 		 * in ieee80211_report_used_skb().
1129 		 */
1130 		ieee80211_sta_update_pending_airtime(local, sta,
1131 						     skb_get_queue_mapping(skb),
1132 						     tx_time_est,
1133 						     true);
1134 		ieee80211_info_set_tx_time_est(IEEE80211_SKB_CB(skb), 0);
1135 	}
1136 
1137 	if (!status->info)
1138 		goto free;
1139 
1140 	rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1141 
1142 	acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1143 	noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1144 	ack_signal_valid =
1145 		!!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
1146 
1147 	if (pubsta) {
1148 		struct ieee80211_sub_if_data *sdata = sta->sdata;
1149 
1150 		if (!acked && !noack_success)
1151 			sta->deflink.status_stats.retry_failed++;
1152 		sta->deflink.status_stats.retry_count += retry_count;
1153 
1154 		if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1155 			if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1156 			    skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1157 				ieee80211_sta_tx_notify(sdata, (void *) skb->data,
1158 							acked, info->status.tx_time);
1159 
1160 			if (acked) {
1161 				sta->deflink.status_stats.last_ack = jiffies;
1162 
1163 				if (sta->deflink.status_stats.lost_packets)
1164 					sta->deflink.status_stats.lost_packets = 0;
1165 
1166 				/* Track when last packet was ACKed */
1167 				sta->deflink.status_stats.last_pkt_time = jiffies;
1168 
1169 				/* Reset connection monitor */
1170 				if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1171 				    unlikely(sdata->u.mgd.probe_send_count > 0))
1172 					sdata->u.mgd.probe_send_count = 0;
1173 
1174 				if (ack_signal_valid) {
1175 					sta->deflink.status_stats.last_ack_signal =
1176 							 (s8)info->status.ack_signal;
1177 					sta->deflink.status_stats.ack_signal_filled = true;
1178 					ewma_avg_signal_add(&sta->deflink.status_stats.avg_ack_signal,
1179 							    -info->status.ack_signal);
1180 				}
1181 			} else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1182 				/*
1183 				 * The STA is in power save mode, so assume
1184 				 * that this TX packet failed because of that.
1185 				 */
1186 				if (skb)
1187 					ieee80211_handle_filtered_frame(local, sta, skb);
1188 				return;
1189 			} else if (noack_success) {
1190 				/* nothing to do here, do not account as lost */
1191 			} else {
1192 				ieee80211_lost_packet(sta, info);
1193 			}
1194 		}
1195 
1196 		rate_control_tx_status(local, status);
1197 		if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1198 			ieee80211s_update_metric(local, sta, status);
1199 	}
1200 
1201 	if (skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1202 		return __ieee80211_tx_status(hw, status, rates_idx,
1203 					     retry_count);
1204 
1205 	if (acked || noack_success) {
1206 		I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1207 		if (!pubsta)
1208 			I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1209 		if (retry_count > 0)
1210 			I802_DEBUG_INC(local->dot11RetryCount);
1211 		if (retry_count > 1)
1212 			I802_DEBUG_INC(local->dot11MultipleRetryCount);
1213 	} else {
1214 		I802_DEBUG_INC(local->dot11FailedCount);
1215 	}
1216 
1217 free:
1218 	if (!skb)
1219 		return;
1220 
1221 	ieee80211_report_used_skb(local, skb, false, status->ack_hwtstamp);
1222 	if (status->free_list)
1223 		list_add_tail(&skb->list, status->free_list);
1224 	else
1225 		dev_kfree_skb(skb);
1226 }
1227 EXPORT_SYMBOL(ieee80211_tx_status_ext);
1228 
ieee80211_tx_rate_update(struct ieee80211_hw * hw,struct ieee80211_sta * pubsta,struct ieee80211_tx_info * info)1229 void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1230 			      struct ieee80211_sta *pubsta,
1231 			      struct ieee80211_tx_info *info)
1232 {
1233 	struct ieee80211_local *local = hw_to_local(hw);
1234 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1235 	struct ieee80211_tx_status status = {
1236 		.info = info,
1237 		.sta = pubsta,
1238 	};
1239 
1240 	rate_control_tx_status(local, &status);
1241 
1242 	if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1243 		sta->deflink.tx_stats.last_rate = info->status.rates[0];
1244 }
1245 EXPORT_SYMBOL(ieee80211_tx_rate_update);
1246 
ieee80211_tx_status_8023(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct sk_buff * skb)1247 void ieee80211_tx_status_8023(struct ieee80211_hw *hw,
1248 			      struct ieee80211_vif *vif,
1249 			      struct sk_buff *skb)
1250 {
1251 	struct ieee80211_sub_if_data *sdata;
1252 	struct ieee80211_tx_status status = {
1253 		.skb = skb,
1254 		.info = IEEE80211_SKB_CB(skb),
1255 	};
1256 	struct sta_info *sta;
1257 
1258 	sdata = vif_to_sdata(vif);
1259 
1260 	rcu_read_lock();
1261 
1262 	if (!ieee80211_lookup_ra_sta(sdata, skb, &sta) && !IS_ERR(sta))
1263 		status.sta = &sta->sta;
1264 
1265 	ieee80211_tx_status_ext(hw, &status);
1266 
1267 	rcu_read_unlock();
1268 }
1269 EXPORT_SYMBOL(ieee80211_tx_status_8023);
1270 
ieee80211_report_low_ack(struct ieee80211_sta * pubsta,u32 num_packets)1271 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1272 {
1273 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1274 	cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1275 				    num_packets, GFP_ATOMIC);
1276 }
1277 EXPORT_SYMBOL(ieee80211_report_low_ack);
1278 
ieee80211_free_txskb(struct ieee80211_hw * hw,struct sk_buff * skb)1279 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1280 {
1281 	struct ieee80211_local *local = hw_to_local(hw);
1282 	ktime_t kt = ktime_set(0, 0);
1283 
1284 	ieee80211_report_used_skb(local, skb, true, kt);
1285 	dev_kfree_skb_any(skb);
1286 }
1287 EXPORT_SYMBOL(ieee80211_free_txskb);
1288 
ieee80211_purge_tx_queue(struct ieee80211_hw * hw,struct sk_buff_head * skbs)1289 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1290 			      struct sk_buff_head *skbs)
1291 {
1292 	struct sk_buff *skb;
1293 
1294 	while ((skb = __skb_dequeue(skbs)))
1295 		ieee80211_free_txskb(hw, skb);
1296 }
1297