1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * HT handling
4  *
5  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
6  * Copyright 2002-2005, Instant802 Networks, Inc.
7  * Copyright 2005-2006, Devicescape Software, Inc.
8  * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
9  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
10  * Copyright 2007-2010, Intel Corporation
11  * Copyright 2017	Intel Deutschland GmbH
12  * Copyright(c) 2020-2022 Intel Corporation
13  */
14 
15 #include <linux/ieee80211.h>
16 #include <linux/export.h>
17 #include <net/mac80211.h>
18 #include "ieee80211_i.h"
19 #include "rate.h"
20 
__check_htcap_disable(struct ieee80211_ht_cap * ht_capa,struct ieee80211_ht_cap * ht_capa_mask,struct ieee80211_sta_ht_cap * ht_cap,u16 flag)21 static void __check_htcap_disable(struct ieee80211_ht_cap *ht_capa,
22 				  struct ieee80211_ht_cap *ht_capa_mask,
23 				  struct ieee80211_sta_ht_cap *ht_cap,
24 				  u16 flag)
25 {
26 	__le16 le_flag = cpu_to_le16(flag);
27 	if (ht_capa_mask->cap_info & le_flag) {
28 		if (!(ht_capa->cap_info & le_flag))
29 			ht_cap->cap &= ~flag;
30 	}
31 }
32 
__check_htcap_enable(struct ieee80211_ht_cap * ht_capa,struct ieee80211_ht_cap * ht_capa_mask,struct ieee80211_sta_ht_cap * ht_cap,u16 flag)33 static void __check_htcap_enable(struct ieee80211_ht_cap *ht_capa,
34 				  struct ieee80211_ht_cap *ht_capa_mask,
35 				  struct ieee80211_sta_ht_cap *ht_cap,
36 				  u16 flag)
37 {
38 	__le16 le_flag = cpu_to_le16(flag);
39 
40 	if ((ht_capa_mask->cap_info & le_flag) &&
41 	    (ht_capa->cap_info & le_flag))
42 		ht_cap->cap |= flag;
43 }
44 
ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data * sdata,struct ieee80211_sta_ht_cap * ht_cap)45 void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
46 				     struct ieee80211_sta_ht_cap *ht_cap)
47 {
48 	struct ieee80211_ht_cap *ht_capa, *ht_capa_mask;
49 	u8 *scaps, *smask;
50 	int i;
51 
52 	if (!ht_cap->ht_supported)
53 		return;
54 
55 	switch (sdata->vif.type) {
56 	case NL80211_IFTYPE_STATION:
57 		ht_capa = &sdata->u.mgd.ht_capa;
58 		ht_capa_mask = &sdata->u.mgd.ht_capa_mask;
59 		break;
60 	case NL80211_IFTYPE_ADHOC:
61 		ht_capa = &sdata->u.ibss.ht_capa;
62 		ht_capa_mask = &sdata->u.ibss.ht_capa_mask;
63 		break;
64 	default:
65 		WARN_ON_ONCE(1);
66 		return;
67 	}
68 
69 	scaps = (u8 *)(&ht_capa->mcs.rx_mask);
70 	smask = (u8 *)(&ht_capa_mask->mcs.rx_mask);
71 
72 	/* NOTE:  If you add more over-rides here, update register_hw
73 	 * ht_capa_mod_mask logic in main.c as well.
74 	 * And, if this method can ever change ht_cap.ht_supported, fix
75 	 * the check in ieee80211_add_ht_ie.
76 	 */
77 
78 	/* check for HT over-rides, MCS rates first. */
79 	for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
80 		u8 m = smask[i];
81 		ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
82 		/* Add back rates that are supported */
83 		ht_cap->mcs.rx_mask[i] |= (m & scaps[i]);
84 	}
85 
86 	/* Force removal of HT-40 capabilities? */
87 	__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
88 			      IEEE80211_HT_CAP_SUP_WIDTH_20_40);
89 	__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
90 			      IEEE80211_HT_CAP_SGI_40);
91 
92 	/* Allow user to disable SGI-20 (SGI-40 is handled above) */
93 	__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
94 			      IEEE80211_HT_CAP_SGI_20);
95 
96 	/* Allow user to disable the max-AMSDU bit. */
97 	__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
98 			      IEEE80211_HT_CAP_MAX_AMSDU);
99 
100 	/* Allow user to disable LDPC */
101 	__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
102 			      IEEE80211_HT_CAP_LDPC_CODING);
103 
104 	/* Allow user to enable 40 MHz intolerant bit. */
105 	__check_htcap_enable(ht_capa, ht_capa_mask, ht_cap,
106 			     IEEE80211_HT_CAP_40MHZ_INTOLERANT);
107 
108 	/* Allow user to enable TX STBC bit  */
109 	__check_htcap_enable(ht_capa, ht_capa_mask, ht_cap,
110 			     IEEE80211_HT_CAP_TX_STBC);
111 
112 	/* Allow user to configure RX STBC bits */
113 	if (ht_capa_mask->cap_info & cpu_to_le16(IEEE80211_HT_CAP_RX_STBC))
114 		ht_cap->cap |= le16_to_cpu(ht_capa->cap_info) &
115 					IEEE80211_HT_CAP_RX_STBC;
116 
117 	/* Allow user to decrease AMPDU factor */
118 	if (ht_capa_mask->ampdu_params_info &
119 	    IEEE80211_HT_AMPDU_PARM_FACTOR) {
120 		u8 n = ht_capa->ampdu_params_info &
121 		       IEEE80211_HT_AMPDU_PARM_FACTOR;
122 		if (n < ht_cap->ampdu_factor)
123 			ht_cap->ampdu_factor = n;
124 	}
125 
126 	/* Allow the user to increase AMPDU density. */
127 	if (ht_capa_mask->ampdu_params_info &
128 	    IEEE80211_HT_AMPDU_PARM_DENSITY) {
129 		u8 n = (ht_capa->ampdu_params_info &
130 			IEEE80211_HT_AMPDU_PARM_DENSITY)
131 			>> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
132 		if (n > ht_cap->ampdu_density)
133 			ht_cap->ampdu_density = n;
134 	}
135 }
136 
137 
ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data * sdata,struct ieee80211_supported_band * sband,const struct ieee80211_ht_cap * ht_cap_ie,struct link_sta_info * link_sta)138 bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
139 				       struct ieee80211_supported_band *sband,
140 				       const struct ieee80211_ht_cap *ht_cap_ie,
141 				       struct link_sta_info *link_sta)
142 {
143 	struct ieee80211_bss_conf *link_conf;
144 	struct sta_info *sta = link_sta->sta;
145 	struct ieee80211_sta_ht_cap ht_cap, own_cap;
146 	u8 ampdu_info, tx_mcs_set_cap;
147 	int i, max_tx_streams;
148 	bool changed;
149 	enum ieee80211_sta_rx_bandwidth bw;
150 	enum nl80211_chan_width width;
151 
152 	memset(&ht_cap, 0, sizeof(ht_cap));
153 
154 	if (!ht_cap_ie || !sband->ht_cap.ht_supported)
155 		goto apply;
156 
157 	ht_cap.ht_supported = true;
158 
159 	own_cap = sband->ht_cap;
160 
161 	/*
162 	 * If user has specified capability over-rides, take care
163 	 * of that if the station we're setting up is the AP or TDLS peer that
164 	 * we advertised a restricted capability set to. Override
165 	 * our own capabilities and then use those below.
166 	 */
167 	if (sdata->vif.type == NL80211_IFTYPE_STATION ||
168 	    sdata->vif.type == NL80211_IFTYPE_ADHOC)
169 		ieee80211_apply_htcap_overrides(sdata, &own_cap);
170 
171 	/*
172 	 * The bits listed in this expression should be
173 	 * the same for the peer and us, if the station
174 	 * advertises more then we can't use those thus
175 	 * we mask them out.
176 	 */
177 	ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) &
178 		(own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING |
179 				 IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
180 				 IEEE80211_HT_CAP_GRN_FLD |
181 				 IEEE80211_HT_CAP_SGI_20 |
182 				 IEEE80211_HT_CAP_SGI_40 |
183 				 IEEE80211_HT_CAP_DSSSCCK40));
184 
185 	/*
186 	 * The STBC bits are asymmetric -- if we don't have
187 	 * TX then mask out the peer's RX and vice versa.
188 	 */
189 	if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC))
190 		ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC;
191 	if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC))
192 		ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC;
193 
194 	ampdu_info = ht_cap_ie->ampdu_params_info;
195 	ht_cap.ampdu_factor =
196 		ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
197 	ht_cap.ampdu_density =
198 		(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
199 
200 	/* own MCS TX capabilities */
201 	tx_mcs_set_cap = own_cap.mcs.tx_params;
202 
203 	/* Copy peer MCS TX capabilities, the driver might need them. */
204 	ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params;
205 
206 	/* can we TX with MCS rates? */
207 	if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
208 		goto apply;
209 
210 	/* Counting from 0, therefore +1 */
211 	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
212 		max_tx_streams =
213 			((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
214 				>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
215 	else
216 		max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
217 
218 	/*
219 	 * 802.11n-2009 20.3.5 / 20.6 says:
220 	 * - indices 0 to 7 and 32 are single spatial stream
221 	 * - 8 to 31 are multiple spatial streams using equal modulation
222 	 *   [8..15 for two streams, 16..23 for three and 24..31 for four]
223 	 * - remainder are multiple spatial streams using unequal modulation
224 	 */
225 	for (i = 0; i < max_tx_streams; i++)
226 		ht_cap.mcs.rx_mask[i] =
227 			own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
228 
229 	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
230 		for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
231 		     i < IEEE80211_HT_MCS_MASK_LEN; i++)
232 			ht_cap.mcs.rx_mask[i] =
233 				own_cap.mcs.rx_mask[i] &
234 					ht_cap_ie->mcs.rx_mask[i];
235 
236 	/* handle MCS rate 32 too */
237 	if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
238 		ht_cap.mcs.rx_mask[32/8] |= 1;
239 
240 	/* set Rx highest rate */
241 	ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest;
242 
243 	if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU)
244 		link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935;
245 	else
246 		link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839;
247 
248 	ieee80211_sta_recalc_aggregates(&sta->sta);
249 
250  apply:
251 	changed = memcmp(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
252 
253 	memcpy(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
254 
255 	rcu_read_lock();
256 	link_conf = rcu_dereference(sdata->vif.link_conf[link_sta->link_id]);
257 	if (WARN_ON(!link_conf))
258 		width = NL80211_CHAN_WIDTH_20_NOHT;
259 	else
260 		width = link_conf->chandef.width;
261 
262 	switch (width) {
263 	default:
264 		WARN_ON_ONCE(1);
265 		fallthrough;
266 	case NL80211_CHAN_WIDTH_20_NOHT:
267 	case NL80211_CHAN_WIDTH_20:
268 		bw = IEEE80211_STA_RX_BW_20;
269 		break;
270 	case NL80211_CHAN_WIDTH_40:
271 	case NL80211_CHAN_WIDTH_80:
272 	case NL80211_CHAN_WIDTH_80P80:
273 	case NL80211_CHAN_WIDTH_160:
274 		bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
275 				IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
276 		break;
277 	}
278 	rcu_read_unlock();
279 
280 	link_sta->pub->bandwidth = bw;
281 
282 	link_sta->cur_max_bandwidth =
283 		ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
284 				IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
285 
286 	if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
287 	    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
288 		enum ieee80211_smps_mode smps_mode;
289 
290 		switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
291 				>> IEEE80211_HT_CAP_SM_PS_SHIFT) {
292 		case WLAN_HT_CAP_SM_PS_INVALID:
293 		case WLAN_HT_CAP_SM_PS_STATIC:
294 			smps_mode = IEEE80211_SMPS_STATIC;
295 			break;
296 		case WLAN_HT_CAP_SM_PS_DYNAMIC:
297 			smps_mode = IEEE80211_SMPS_DYNAMIC;
298 			break;
299 		case WLAN_HT_CAP_SM_PS_DISABLED:
300 			smps_mode = IEEE80211_SMPS_OFF;
301 			break;
302 		}
303 
304 		if (smps_mode != link_sta->pub->smps_mode)
305 			changed = true;
306 		link_sta->pub->smps_mode = smps_mode;
307 	} else {
308 		link_sta->pub->smps_mode = IEEE80211_SMPS_OFF;
309 	}
310 
311 	return changed;
312 }
313 
ieee80211_sta_tear_down_BA_sessions(struct sta_info * sta,enum ieee80211_agg_stop_reason reason)314 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
315 					 enum ieee80211_agg_stop_reason reason)
316 {
317 	int i;
318 
319 	mutex_lock(&sta->ampdu_mlme.mtx);
320 	for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
321 		___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
322 						WLAN_REASON_QSTA_LEAVE_QBSS,
323 						reason != AGG_STOP_DESTROY_STA &&
324 						reason != AGG_STOP_PEER_REQUEST);
325 
326 	for (i = 0; i <  IEEE80211_NUM_TIDS; i++)
327 		___ieee80211_stop_tx_ba_session(sta, i, reason);
328 	mutex_unlock(&sta->ampdu_mlme.mtx);
329 
330 	/*
331 	 * In case the tear down is part of a reconfigure due to HW restart
332 	 * request, it is possible that the low level driver requested to stop
333 	 * the BA session, so handle it to properly clean tid_tx data.
334 	 */
335 	if(reason == AGG_STOP_DESTROY_STA) {
336 		cancel_work_sync(&sta->ampdu_mlme.work);
337 
338 		mutex_lock(&sta->ampdu_mlme.mtx);
339 		for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
340 			struct tid_ampdu_tx *tid_tx =
341 				rcu_dereference_protected_tid_tx(sta, i);
342 
343 			if (!tid_tx)
344 				continue;
345 
346 			if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
347 				ieee80211_stop_tx_ba_cb(sta, i, tid_tx);
348 		}
349 		mutex_unlock(&sta->ampdu_mlme.mtx);
350 	}
351 }
352 
ieee80211_ba_session_work(struct work_struct * work)353 void ieee80211_ba_session_work(struct work_struct *work)
354 {
355 	struct sta_info *sta =
356 		container_of(work, struct sta_info, ampdu_mlme.work);
357 	struct tid_ampdu_tx *tid_tx;
358 	bool blocked;
359 	int tid;
360 
361 	/* When this flag is set, new sessions should be blocked. */
362 	blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA);
363 
364 	mutex_lock(&sta->ampdu_mlme.mtx);
365 	for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
366 		if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
367 			___ieee80211_stop_rx_ba_session(
368 				sta, tid, WLAN_BACK_RECIPIENT,
369 				WLAN_REASON_QSTA_TIMEOUT, true);
370 
371 		if (test_and_clear_bit(tid,
372 				       sta->ampdu_mlme.tid_rx_stop_requested))
373 			___ieee80211_stop_rx_ba_session(
374 				sta, tid, WLAN_BACK_RECIPIENT,
375 				WLAN_REASON_UNSPECIFIED, true);
376 
377 		if (!blocked &&
378 		    test_and_clear_bit(tid,
379 				       sta->ampdu_mlme.tid_rx_manage_offl))
380 			___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid,
381 							 IEEE80211_MAX_AMPDU_BUF_HT,
382 							 false, true, NULL);
383 
384 		if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS,
385 				       sta->ampdu_mlme.tid_rx_manage_offl))
386 			___ieee80211_stop_rx_ba_session(
387 				sta, tid, WLAN_BACK_RECIPIENT,
388 				0, false);
389 
390 		spin_lock_bh(&sta->lock);
391 
392 		tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
393 		if (!blocked && tid_tx) {
394 			struct ieee80211_sub_if_data *sdata = sta->sdata;
395 			struct ieee80211_local *local = sdata->local;
396 
397 			if (local->ops->wake_tx_queue) {
398 				struct txq_info *txqi =
399 					to_txq_info(sta->sta.txq[tid]);
400 				struct fq *fq = &local->fq;
401 
402 				spin_lock_bh(&fq->lock);
403 
404 				/* Allow only frags to be dequeued */
405 				set_bit(IEEE80211_TXQ_STOP, &txqi->flags);
406 
407 				if (!skb_queue_empty(&txqi->frags)) {
408 					/* Fragmented Tx is ongoing, wait for it
409 					 * to finish. Reschedule worker to retry
410 					 * later.
411 					 */
412 
413 					spin_unlock_bh(&fq->lock);
414 					spin_unlock_bh(&sta->lock);
415 
416 					/* Give the task working on the txq a
417 					 * chance to send out the queued frags
418 					 */
419 					synchronize_net();
420 
421 					mutex_unlock(&sta->ampdu_mlme.mtx);
422 
423 					ieee80211_queue_work(&sdata->local->hw,
424 							     work);
425 					return;
426 				}
427 
428 				spin_unlock_bh(&fq->lock);
429 			}
430 
431 			/*
432 			 * Assign it over to the normal tid_tx array
433 			 * where it "goes live".
434 			 */
435 
436 			sta->ampdu_mlme.tid_start_tx[tid] = NULL;
437 			/* could there be a race? */
438 			if (sta->ampdu_mlme.tid_tx[tid])
439 				kfree(tid_tx);
440 			else
441 				ieee80211_assign_tid_tx(sta, tid, tid_tx);
442 			spin_unlock_bh(&sta->lock);
443 
444 			ieee80211_tx_ba_session_handle_start(sta, tid);
445 			continue;
446 		}
447 		spin_unlock_bh(&sta->lock);
448 
449 		tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
450 		if (!tid_tx)
451 			continue;
452 
453 		if (!blocked &&
454 		    test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state))
455 			ieee80211_start_tx_ba_cb(sta, tid, tid_tx);
456 		if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state))
457 			___ieee80211_stop_tx_ba_session(sta, tid,
458 							AGG_STOP_LOCAL_REQUEST);
459 		if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
460 			ieee80211_stop_tx_ba_cb(sta, tid, tid_tx);
461 	}
462 	mutex_unlock(&sta->ampdu_mlme.mtx);
463 }
464 
ieee80211_send_delba(struct ieee80211_sub_if_data * sdata,const u8 * da,u16 tid,u16 initiator,u16 reason_code)465 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
466 			  const u8 *da, u16 tid,
467 			  u16 initiator, u16 reason_code)
468 {
469 	struct ieee80211_local *local = sdata->local;
470 	struct sk_buff *skb;
471 	struct ieee80211_mgmt *mgmt;
472 	u16 params;
473 
474 	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
475 	if (!skb)
476 		return;
477 
478 	skb_reserve(skb, local->hw.extra_tx_headroom);
479 	mgmt = skb_put_zero(skb, 24);
480 	memcpy(mgmt->da, da, ETH_ALEN);
481 	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
482 	if (sdata->vif.type == NL80211_IFTYPE_AP ||
483 	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
484 	    sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
485 		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
486 	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
487 		memcpy(mgmt->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
488 	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
489 		memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
490 
491 	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
492 					  IEEE80211_STYPE_ACTION);
493 
494 	skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
495 
496 	mgmt->u.action.category = WLAN_CATEGORY_BACK;
497 	mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
498 	params = (u16)(initiator << 11); 	/* bit 11 initiator */
499 	params |= (u16)(tid << 12); 		/* bit 15:12 TID number */
500 
501 	mgmt->u.action.u.delba.params = cpu_to_le16(params);
502 	mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
503 
504 	ieee80211_tx_skb(sdata, skb);
505 }
506 
ieee80211_process_delba(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_mgmt * mgmt,size_t len)507 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
508 			     struct sta_info *sta,
509 			     struct ieee80211_mgmt *mgmt, size_t len)
510 {
511 	u16 tid, params;
512 	u16 initiator;
513 
514 	params = le16_to_cpu(mgmt->u.action.u.delba.params);
515 	tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
516 	initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
517 
518 	ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
519 			   mgmt->sa, initiator ? "initiator" : "recipient",
520 			   tid,
521 			   le16_to_cpu(mgmt->u.action.u.delba.reason_code));
522 
523 	if (initiator == WLAN_BACK_INITIATOR)
524 		__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
525 					       true);
526 	else
527 		__ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
528 }
529 
530 enum nl80211_smps_mode
ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)531 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)
532 {
533 	switch (smps) {
534 	case IEEE80211_SMPS_OFF:
535 		return NL80211_SMPS_OFF;
536 	case IEEE80211_SMPS_STATIC:
537 		return NL80211_SMPS_STATIC;
538 	case IEEE80211_SMPS_DYNAMIC:
539 		return NL80211_SMPS_DYNAMIC;
540 	default:
541 		return NL80211_SMPS_OFF;
542 	}
543 }
544 
ieee80211_send_smps_action(struct ieee80211_sub_if_data * sdata,enum ieee80211_smps_mode smps,const u8 * da,const u8 * bssid)545 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
546 			       enum ieee80211_smps_mode smps, const u8 *da,
547 			       const u8 *bssid)
548 {
549 	struct ieee80211_local *local = sdata->local;
550 	struct sk_buff *skb;
551 	struct ieee80211_mgmt *action_frame;
552 
553 	/* 27 = header + category + action + smps mode */
554 	skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
555 	if (!skb)
556 		return -ENOMEM;
557 
558 	skb_reserve(skb, local->hw.extra_tx_headroom);
559 	action_frame = skb_put(skb, 27);
560 	memcpy(action_frame->da, da, ETH_ALEN);
561 	memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
562 	memcpy(action_frame->bssid, bssid, ETH_ALEN);
563 	action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
564 						  IEEE80211_STYPE_ACTION);
565 	action_frame->u.action.category = WLAN_CATEGORY_HT;
566 	action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
567 	switch (smps) {
568 	case IEEE80211_SMPS_AUTOMATIC:
569 	case IEEE80211_SMPS_NUM_MODES:
570 		WARN_ON(1);
571 		fallthrough;
572 	case IEEE80211_SMPS_OFF:
573 		action_frame->u.action.u.ht_smps.smps_control =
574 				WLAN_HT_SMPS_CONTROL_DISABLED;
575 		break;
576 	case IEEE80211_SMPS_STATIC:
577 		action_frame->u.action.u.ht_smps.smps_control =
578 				WLAN_HT_SMPS_CONTROL_STATIC;
579 		break;
580 	case IEEE80211_SMPS_DYNAMIC:
581 		action_frame->u.action.u.ht_smps.smps_control =
582 				WLAN_HT_SMPS_CONTROL_DYNAMIC;
583 		break;
584 	}
585 
586 	/* we'll do more on status of this frame */
587 	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
588 	ieee80211_tx_skb(sdata, skb);
589 
590 	return 0;
591 }
592 
ieee80211_request_smps(struct ieee80211_vif * vif,unsigned int link_id,enum ieee80211_smps_mode smps_mode)593 void ieee80211_request_smps(struct ieee80211_vif *vif, unsigned int link_id,
594 			    enum ieee80211_smps_mode smps_mode)
595 {
596 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
597 	struct ieee80211_link_data *link;
598 
599 	if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION))
600 		return;
601 
602 	rcu_read_lock();
603 	link = rcu_dereference(sdata->link[link_id]);
604 	if (WARN_ON(!link))
605 		goto out;
606 
607 	if (link->u.mgd.driver_smps_mode == smps_mode)
608 		goto out;
609 
610 	link->u.mgd.driver_smps_mode = smps_mode;
611 	ieee80211_queue_work(&sdata->local->hw, &link->u.mgd.request_smps_work);
612 out:
613 	rcu_read_unlock();
614 }
615 /* this might change ... don't want non-open drivers using it */
616 EXPORT_SYMBOL_GPL(ieee80211_request_smps);
617