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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
4 * Copyright 2012-2013, cozybit Inc.
5 * Copyright (C) 2021 Intel Corporation
6 */
7
8#include "mesh.h"
9#include "wme.h"
10
11
12/* mesh PS management */
13
14/**
15 * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave
16 * @sta: the station to get the frame for
17 */
18static struct sk_buff *mps_qos_null_get(struct sta_info *sta)
19{
20 struct ieee80211_sub_if_data *sdata = sta->sdata;
21 struct ieee80211_local *local = sdata->local;
22 struct ieee80211_hdr *nullfunc; /* use 4addr header */
23 struct sk_buff *skb;
24 int size = sizeof(*nullfunc);
25 __le16 fc;
26
27 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2);
28 if (!skb)
29 return NULL;
30 skb_reserve(skb, local->hw.extra_tx_headroom);
31
32 nullfunc = skb_put(skb, size);
33 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC);
34 ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr,
35 sdata->vif.addr);
36 nullfunc->frame_control = fc;
37 nullfunc->duration_id = 0;
38 nullfunc->seq_ctrl = 0;
39 /* no address resolution for this frame -> set addr 1 immediately */
40 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
41 skb_put_zero(skb, 2); /* append QoS control field */
42 ieee80211_mps_set_frame_flags(sdata, sta, nullfunc);
43
44 return skb;
45}
46
47/**
48 * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode
49 * @sta: the station to send to
50 */
51static void mps_qos_null_tx(struct sta_info *sta)
52{
53 struct sk_buff *skb;
54
55 skb = mps_qos_null_get(sta);
56 if (!skb)
57 return;
58
59 mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n",
60 sta->sta.addr);
61
62 /* don't unintentionally start a MPSP */
63 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
64 u8 *qc = ieee80211_get_qos_ctl((void *) skb->data);
65
66 qc[0] |= IEEE80211_QOS_CTL_EOSP;
67 }
68
69 ieee80211_tx_skb(sta->sdata, skb);
70}
71
72/**
73 * ieee80211_mps_local_status_update - track status of local link-specific PMs
74 *
75 * @sdata: local mesh subif
76 *
77 * sets the non-peer power mode and triggers the driver PS (re-)configuration
78 * Return BSS_CHANGED_BEACON if a beacon update is necessary.
79 */
80u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata)
81{
82 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
83 struct sta_info *sta;
84 bool peering = false;
85 int light_sleep_cnt = 0;
86 int deep_sleep_cnt = 0;
87 u32 changed = 0;
88 enum nl80211_mesh_power_mode nonpeer_pm;
89
90 rcu_read_lock();
91 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
92 if (sdata != sta->sdata)
93 continue;
94
95 switch (sta->mesh->plink_state) {
96 case NL80211_PLINK_OPN_SNT:
97 case NL80211_PLINK_OPN_RCVD:
98 case NL80211_PLINK_CNF_RCVD:
99 peering = true;
100 break;
101 case NL80211_PLINK_ESTAB:
102 if (sta->mesh->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP)
103 light_sleep_cnt++;
104 else if (sta->mesh->local_pm == NL80211_MESH_POWER_DEEP_SLEEP)
105 deep_sleep_cnt++;
106 break;
107 default:
108 break;
109 }
110 }
111 rcu_read_unlock();
112
113 /*
114 * Set non-peer mode to active during peering/scanning/authentication
115 * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is
116 * deep sleep if the local STA is in light or deep sleep towards at
117 * least one mesh peer (see 13.14.3.1). Otherwise, set it to the
118 * user-configured default value.
119 */
120 if (peering) {
121 mps_dbg(sdata, "setting non-peer PM to active for peering\n");
122 nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
123 } else if (light_sleep_cnt || deep_sleep_cnt) {
124 mps_dbg(sdata, "setting non-peer PM to deep sleep\n");
125 nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP;
126 } else {
127 mps_dbg(sdata, "setting non-peer PM to user value\n");
128 nonpeer_pm = ifmsh->mshcfg.power_mode;
129 }
130
131 /* need update if sleep counts move between 0 and non-zero */
132 if (ifmsh->nonpeer_pm != nonpeer_pm ||
133 !ifmsh->ps_peers_light_sleep != !light_sleep_cnt ||
134 !ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt)
135 changed = BSS_CHANGED_BEACON;
136
137 ifmsh->nonpeer_pm = nonpeer_pm;
138 ifmsh->ps_peers_light_sleep = light_sleep_cnt;
139 ifmsh->ps_peers_deep_sleep = deep_sleep_cnt;
140
141 return changed;
142}
143
144/**
145 * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA
146 *
147 * @sta: mesh STA
148 * @pm: the power mode to set
149 * Return BSS_CHANGED_BEACON if a beacon update is in order.
150 */
151u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
152 enum nl80211_mesh_power_mode pm)
153{
154 struct ieee80211_sub_if_data *sdata = sta->sdata;
155
156 if (sta->mesh->local_pm == pm)
157 return 0;
158
159 mps_dbg(sdata, "local STA operates in mode %d with %pM\n",
160 pm, sta->sta.addr);
161
162 sta->mesh->local_pm = pm;
163
164 /*
165 * announce peer-specific power mode transition
166 * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
167 */
168 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
169 mps_qos_null_tx(sta);
170
171 return ieee80211_mps_local_status_update(sdata);
172}
173
174/**
175 * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control)
176 *
177 * @sdata: local mesh subif
178 * @sta: mesh STA
179 * @hdr: 802.11 frame header
180 *
181 * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11
182 *
183 * NOTE: sta must be given when an individually-addressed QoS frame header
184 * is handled, for group-addressed and management frames it is not used
185 */
186void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
187 struct sta_info *sta,
188 struct ieee80211_hdr *hdr)
189{
190 enum nl80211_mesh_power_mode pm;
191 u8 *qc;
192
193 if (WARN_ON(is_unicast_ether_addr(hdr->addr1) &&
194 ieee80211_is_data_qos(hdr->frame_control) &&
195 !sta))
196 return;
197
198 if (is_unicast_ether_addr(hdr->addr1) &&
199 ieee80211_is_data_qos(hdr->frame_control) &&
200 sta->mesh->plink_state == NL80211_PLINK_ESTAB)
201 pm = sta->mesh->local_pm;
202 else
203 pm = sdata->u.mesh.nonpeer_pm;
204
205 if (pm == NL80211_MESH_POWER_ACTIVE)
206 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM);
207 else
208 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
209
210 if (!ieee80211_is_data_qos(hdr->frame_control))
211 return;
212
213 qc = ieee80211_get_qos_ctl(hdr);
214
215 if ((is_unicast_ether_addr(hdr->addr1) &&
216 pm == NL80211_MESH_POWER_DEEP_SLEEP) ||
217 (is_multicast_ether_addr(hdr->addr1) &&
218 sdata->u.mesh.ps_peers_deep_sleep > 0))
219 qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
220 else
221 qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
222}
223
224/**
225 * ieee80211_mps_sta_status_update - update buffering status of neighbor STA
226 *
227 * @sta: mesh STA
228 *
229 * called after change of peering status or non-peer/peer-specific power mode
230 */
231void ieee80211_mps_sta_status_update(struct sta_info *sta)
232{
233 enum nl80211_mesh_power_mode pm;
234 bool do_buffer;
235
236 /* For non-assoc STA, prevent buffering or frame transmission */
237 if (sta->sta_state < IEEE80211_STA_ASSOC)
238 return;
239
240 /*
241 * use peer-specific power mode if peering is established and the
242 * peer's power mode is known
243 */
244 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
245 sta->mesh->peer_pm != NL80211_MESH_POWER_UNKNOWN)
246 pm = sta->mesh->peer_pm;
247 else
248 pm = sta->mesh->nonpeer_pm;
249
250 do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);
251
252 /* clear the MPSP flags for non-peers or active STA */
253 if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
254 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
255 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
256 } else if (!do_buffer) {
257 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
258 }
259
260 /* Don't let the same PS state be set twice */
261 if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer)
262 return;
263
264 if (do_buffer) {
265 set_sta_flag(sta, WLAN_STA_PS_STA);
266 atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps);
267 mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n",
268 sta->sta.addr);
269 } else {
270 ieee80211_sta_ps_deliver_wakeup(sta);
271 }
272}
273
274static void mps_set_sta_peer_pm(struct sta_info *sta,
275 struct ieee80211_hdr *hdr)
276{
277 enum nl80211_mesh_power_mode pm;
278 u8 *qc = ieee80211_get_qos_ctl(hdr);
279
280 /*
281 * Test Power Management field of frame control (PW) and
282 * mesh power save level subfield of QoS control field (PSL)
283 *
284 * | PM | PSL| Mesh PM |
285 * +----+----+---------+
286 * | 0 |Rsrv| Active |
287 * | 1 | 0 | Light |
288 * | 1 | 1 | Deep |
289 */
290 if (ieee80211_has_pm(hdr->frame_control)) {
291 if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8))
292 pm = NL80211_MESH_POWER_DEEP_SLEEP;
293 else
294 pm = NL80211_MESH_POWER_LIGHT_SLEEP;
295 } else {
296 pm = NL80211_MESH_POWER_ACTIVE;
297 }
298
299 if (sta->mesh->peer_pm == pm)
300 return;
301
302 mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
303 sta->sta.addr, pm);
304
305 sta->mesh->peer_pm = pm;
306
307 ieee80211_mps_sta_status_update(sta);
308}
309
310static void mps_set_sta_nonpeer_pm(struct sta_info *sta,
311 struct ieee80211_hdr *hdr)
312{
313 enum nl80211_mesh_power_mode pm;
314
315 if (ieee80211_has_pm(hdr->frame_control))
316 pm = NL80211_MESH_POWER_DEEP_SLEEP;
317 else
318 pm = NL80211_MESH_POWER_ACTIVE;
319
320 if (sta->mesh->nonpeer_pm == pm)
321 return;
322
323 mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
324 sta->sta.addr, pm);
325
326 sta->mesh->nonpeer_pm = pm;
327
328 ieee80211_mps_sta_status_update(sta);
329}
330
331/**
332 * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
333 *
334 * @sta: STA info that transmitted the frame
335 * @hdr: IEEE 802.11 (QoS) Header
336 */
337void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
338 struct ieee80211_hdr *hdr)
339{
340 if (is_unicast_ether_addr(hdr->addr1) &&
341 ieee80211_is_data_qos(hdr->frame_control)) {
342 /*
343 * individually addressed QoS Data/Null frames contain
344 * peer link-specific PS mode towards the local STA
345 */
346 mps_set_sta_peer_pm(sta, hdr);
347
348 /* check for mesh Peer Service Period trigger frames */
349 ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr),
350 sta, false, false);
351 } else {
352 /*
353 * can only determine non-peer PS mode
354 * (see IEEE802.11-2012 8.2.4.1.7)
355 */
356 mps_set_sta_nonpeer_pm(sta, hdr);
357 }
358}
359
360
361/* mesh PS frame release */
362
363static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp)
364{
365 struct ieee80211_sub_if_data *sdata = sta->sdata;
366 struct sk_buff *skb;
367 struct ieee80211_hdr *nullfunc;
368 struct ieee80211_tx_info *info;
369 u8 *qc;
370
371 skb = mps_qos_null_get(sta);
372 if (!skb)
373 return;
374
375 nullfunc = (struct ieee80211_hdr *) skb->data;
376 if (!eosp)
377 nullfunc->frame_control |=
378 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
379 /*
380 * | RSPI | EOSP | MPSP triggering |
381 * +------+------+--------------------+
382 * | 0 | 0 | local STA is owner |
383 * | 0 | 1 | no MPSP (MPSP end) |
384 * | 1 | 0 | both STA are owner |
385 * | 1 | 1 | peer STA is owner | see IEEE802.11-2012 13.14.9.2
386 */
387 qc = ieee80211_get_qos_ctl(nullfunc);
388 if (rspi)
389 qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8);
390 if (eosp)
391 qc[0] |= IEEE80211_QOS_CTL_EOSP;
392
393 info = IEEE80211_SKB_CB(skb);
394
395 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
396 IEEE80211_TX_CTL_REQ_TX_STATUS;
397
398 mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n",
399 rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr);
400
401 ieee80211_tx_skb(sdata, skb);
402}
403
404/**
405 * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
406 * @sta: the station to handle
407 * @frames: the frame list to append to
408 *
409 * To properly end a mesh MPSP the last transmitted frame has to set the EOSP
410 * flag in the QoS Control field. In case the current tailing frame is not a
411 * QoS Data frame, append a QoS Null to carry the flag.
412 */
413static void mpsp_qos_null_append(struct sta_info *sta,
414 struct sk_buff_head *frames)
415{
416 struct ieee80211_sub_if_data *sdata = sta->sdata;
417 struct sk_buff *new_skb, *skb = skb_peek_tail(frames);
418 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
419 struct ieee80211_tx_info *info;
420
421 if (ieee80211_is_data_qos(hdr->frame_control))
422 return;
423
424 new_skb = mps_qos_null_get(sta);
425 if (!new_skb)
426 return;
427
428 mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n",
429 sta->sta.addr);
430 /*
431 * This frame has to be transmitted last. Assign lowest priority to
432 * make sure it cannot pass other frames when releasing multiple ACs.
433 */
434 new_skb->priority = 1;
435 skb_set_queue_mapping(new_skb, IEEE80211_AC_BK);
436 ieee80211_set_qos_hdr(sdata, new_skb);
437
438 info = IEEE80211_SKB_CB(new_skb);
439 info->control.vif = &sdata->vif;
440 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
441
442 __skb_queue_tail(frames, new_skb);
443}
444
445/**
446 * mps_frame_deliver - transmit frames during mesh powersave
447 *
448 * @sta: STA info to transmit to
449 * @n_frames: number of frames to transmit. -1 for all
450 */
451static void mps_frame_deliver(struct sta_info *sta, int n_frames)
452{
453 struct ieee80211_local *local = sta->sdata->local;
454 int ac;
455 struct sk_buff_head frames;
456 struct sk_buff *skb;
457 bool more_data = false;
458
459 skb_queue_head_init(&frames);
460
461 /* collect frame(s) from buffers */
462 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
463 while (n_frames != 0) {
464 skb = skb_dequeue(&sta->tx_filtered[ac]);
465 if (!skb) {
466 skb = skb_dequeue(
467 &sta->ps_tx_buf[ac]);
468 if (skb)
469 local->total_ps_buffered--;
470 }
471 if (!skb)
472 break;
473 n_frames--;
474 __skb_queue_tail(&frames, skb);
475 }
476
477 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
478 !skb_queue_empty(&sta->ps_tx_buf[ac]))
479 more_data = true;
480 }
481
482 /* nothing to send? -> EOSP */
483 if (skb_queue_empty(&frames)) {
484 mpsp_trigger_send(sta, false, true);
485 return;
486 }
487
488 /* in a MPSP make sure the last skb is a QoS Data frame */
489 if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
490 mpsp_qos_null_append(sta, &frames);
491
492 mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n",
493 skb_queue_len(&frames), sta->sta.addr);
494
495 /* prepare collected frames for transmission */
496 skb_queue_walk(&frames, skb) {
497 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
498 struct ieee80211_hdr *hdr = (void *) skb->data;
499
500 /*
501 * Tell TX path to send this frame even though the
502 * STA may still remain is PS mode after this frame
503 * exchange.
504 */
505 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
506
507 if (more_data || !skb_queue_is_last(&frames, skb))
508 hdr->frame_control |=
509 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
510 else
511 hdr->frame_control &=
512 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
513
514 if (skb_queue_is_last(&frames, skb) &&
515 ieee80211_is_data_qos(hdr->frame_control)) {
516 u8 *qoshdr = ieee80211_get_qos_ctl(hdr);
517
518 /* MPSP trigger frame ends service period */
519 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
520 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
521 }
522 }
523
524 ieee80211_add_pending_skbs(local, &frames);
525 sta_info_recalc_tim(sta);
526}
527
528/**
529 * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
530 *
531 * @qc: QoS Control field
532 * @sta: peer to start a MPSP with
533 * @tx: frame was transmitted by the local STA
534 * @acked: frame has been transmitted successfully
535 *
536 * NOTE: active mode STA may only serve as MPSP owner
537 */
538void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
539 bool tx, bool acked)
540{
541 u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8);
542 u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP;
543
544 if (tx) {
545 if (rspi && acked)
546 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
547
548 if (eosp)
549 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
550 else if (acked &&
551 test_sta_flag(sta, WLAN_STA_PS_STA) &&
552 !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
553 mps_frame_deliver(sta, -1);
554 } else {
555 if (eosp)
556 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
557 else if (sta->mesh->local_pm != NL80211_MESH_POWER_ACTIVE)
558 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
559
560 if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
561 mps_frame_deliver(sta, -1);
562 }
563}
564
565/**
566 * ieee80211_mps_frame_release - release frames buffered due to mesh power save
567 *
568 * @sta: mesh STA
569 * @elems: IEs of beacon or probe response
570 *
571 * For peers if we have individually-addressed frames buffered or the peer
572 * indicates buffered frames, send a corresponding MPSP trigger frame. Since
573 * we do not evaluate the awake window duration, QoS Nulls are used as MPSP
574 * trigger frames. If the neighbour STA is not a peer, only send single frames.
575 */
576void ieee80211_mps_frame_release(struct sta_info *sta,
577 struct ieee802_11_elems *elems)
578{
579 int ac, buffer_local = 0;
580 bool has_buffered = false;
581
582 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
583 has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
584 sta->mesh->aid);
585
586 if (has_buffered)
587 mps_dbg(sta->sdata, "%pM indicates buffered frames\n",
588 sta->sta.addr);
589
590 /* only transmit to PS STA with announced, non-zero awake window */
591 if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
592 (!elems->awake_window || !get_unaligned_le16(elems->awake_window)))
593 return;
594
595 if (!test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
596 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
597 buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) +
598 skb_queue_len(&sta->tx_filtered[ac]);
599
600 if (!has_buffered && !buffer_local)
601 return;
602
603 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
604 mpsp_trigger_send(sta, has_buffered, !buffer_local);
605 else
606 mps_frame_deliver(sta, 1);
607}
1/*
2 * Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
3 * Copyright 2012-2013, cozybit Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9
10#include "mesh.h"
11#include "wme.h"
12
13
14/* mesh PS management */
15
16/**
17 * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave
18 */
19static struct sk_buff *mps_qos_null_get(struct sta_info *sta)
20{
21 struct ieee80211_sub_if_data *sdata = sta->sdata;
22 struct ieee80211_local *local = sdata->local;
23 struct ieee80211_hdr *nullfunc; /* use 4addr header */
24 struct sk_buff *skb;
25 int size = sizeof(*nullfunc);
26 __le16 fc;
27
28 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2);
29 if (!skb)
30 return NULL;
31 skb_reserve(skb, local->hw.extra_tx_headroom);
32
33 nullfunc = skb_put(skb, size);
34 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC);
35 ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr,
36 sdata->vif.addr);
37 nullfunc->frame_control = fc;
38 nullfunc->duration_id = 0;
39 nullfunc->seq_ctrl = 0;
40 /* no address resolution for this frame -> set addr 1 immediately */
41 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
42 skb_put_zero(skb, 2); /* append QoS control field */
43 ieee80211_mps_set_frame_flags(sdata, sta, nullfunc);
44
45 return skb;
46}
47
48/**
49 * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode
50 */
51static void mps_qos_null_tx(struct sta_info *sta)
52{
53 struct sk_buff *skb;
54
55 skb = mps_qos_null_get(sta);
56 if (!skb)
57 return;
58
59 mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n",
60 sta->sta.addr);
61
62 /* don't unintentionally start a MPSP */
63 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
64 u8 *qc = ieee80211_get_qos_ctl((void *) skb->data);
65
66 qc[0] |= IEEE80211_QOS_CTL_EOSP;
67 }
68
69 ieee80211_tx_skb(sta->sdata, skb);
70}
71
72/**
73 * ieee80211_mps_local_status_update - track status of local link-specific PMs
74 *
75 * @sdata: local mesh subif
76 *
77 * sets the non-peer power mode and triggers the driver PS (re-)configuration
78 * Return BSS_CHANGED_BEACON if a beacon update is necessary.
79 */
80u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata)
81{
82 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
83 struct sta_info *sta;
84 bool peering = false;
85 int light_sleep_cnt = 0;
86 int deep_sleep_cnt = 0;
87 u32 changed = 0;
88 enum nl80211_mesh_power_mode nonpeer_pm;
89
90 rcu_read_lock();
91 list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
92 if (sdata != sta->sdata)
93 continue;
94
95 switch (sta->mesh->plink_state) {
96 case NL80211_PLINK_OPN_SNT:
97 case NL80211_PLINK_OPN_RCVD:
98 case NL80211_PLINK_CNF_RCVD:
99 peering = true;
100 break;
101 case NL80211_PLINK_ESTAB:
102 if (sta->mesh->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP)
103 light_sleep_cnt++;
104 else if (sta->mesh->local_pm == NL80211_MESH_POWER_DEEP_SLEEP)
105 deep_sleep_cnt++;
106 break;
107 default:
108 break;
109 }
110 }
111 rcu_read_unlock();
112
113 /*
114 * Set non-peer mode to active during peering/scanning/authentication
115 * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is
116 * deep sleep if the local STA is in light or deep sleep towards at
117 * least one mesh peer (see 13.14.3.1). Otherwise, set it to the
118 * user-configured default value.
119 */
120 if (peering) {
121 mps_dbg(sdata, "setting non-peer PM to active for peering\n");
122 nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
123 } else if (light_sleep_cnt || deep_sleep_cnt) {
124 mps_dbg(sdata, "setting non-peer PM to deep sleep\n");
125 nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP;
126 } else {
127 mps_dbg(sdata, "setting non-peer PM to user value\n");
128 nonpeer_pm = ifmsh->mshcfg.power_mode;
129 }
130
131 /* need update if sleep counts move between 0 and non-zero */
132 if (ifmsh->nonpeer_pm != nonpeer_pm ||
133 !ifmsh->ps_peers_light_sleep != !light_sleep_cnt ||
134 !ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt)
135 changed = BSS_CHANGED_BEACON;
136
137 ifmsh->nonpeer_pm = nonpeer_pm;
138 ifmsh->ps_peers_light_sleep = light_sleep_cnt;
139 ifmsh->ps_peers_deep_sleep = deep_sleep_cnt;
140
141 return changed;
142}
143
144/**
145 * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA
146 *
147 * @sta: mesh STA
148 * @pm: the power mode to set
149 * Return BSS_CHANGED_BEACON if a beacon update is in order.
150 */
151u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
152 enum nl80211_mesh_power_mode pm)
153{
154 struct ieee80211_sub_if_data *sdata = sta->sdata;
155
156 if (sta->mesh->local_pm == pm)
157 return 0;
158
159 mps_dbg(sdata, "local STA operates in mode %d with %pM\n",
160 pm, sta->sta.addr);
161
162 sta->mesh->local_pm = pm;
163
164 /*
165 * announce peer-specific power mode transition
166 * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
167 */
168 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
169 mps_qos_null_tx(sta);
170
171 return ieee80211_mps_local_status_update(sdata);
172}
173
174/**
175 * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control)
176 *
177 * @sdata: local mesh subif
178 * @sta: mesh STA
179 * @hdr: 802.11 frame header
180 *
181 * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11
182 *
183 * NOTE: sta must be given when an individually-addressed QoS frame header
184 * is handled, for group-addressed and management frames it is not used
185 */
186void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
187 struct sta_info *sta,
188 struct ieee80211_hdr *hdr)
189{
190 enum nl80211_mesh_power_mode pm;
191 u8 *qc;
192
193 if (WARN_ON(is_unicast_ether_addr(hdr->addr1) &&
194 ieee80211_is_data_qos(hdr->frame_control) &&
195 !sta))
196 return;
197
198 if (is_unicast_ether_addr(hdr->addr1) &&
199 ieee80211_is_data_qos(hdr->frame_control) &&
200 sta->mesh->plink_state == NL80211_PLINK_ESTAB)
201 pm = sta->mesh->local_pm;
202 else
203 pm = sdata->u.mesh.nonpeer_pm;
204
205 if (pm == NL80211_MESH_POWER_ACTIVE)
206 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM);
207 else
208 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
209
210 if (!ieee80211_is_data_qos(hdr->frame_control))
211 return;
212
213 qc = ieee80211_get_qos_ctl(hdr);
214
215 if ((is_unicast_ether_addr(hdr->addr1) &&
216 pm == NL80211_MESH_POWER_DEEP_SLEEP) ||
217 (is_multicast_ether_addr(hdr->addr1) &&
218 sdata->u.mesh.ps_peers_deep_sleep > 0))
219 qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
220 else
221 qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
222}
223
224/**
225 * ieee80211_mps_sta_status_update - update buffering status of neighbor STA
226 *
227 * @sta: mesh STA
228 *
229 * called after change of peering status or non-peer/peer-specific power mode
230 */
231void ieee80211_mps_sta_status_update(struct sta_info *sta)
232{
233 enum nl80211_mesh_power_mode pm;
234 bool do_buffer;
235
236 /* For non-assoc STA, prevent buffering or frame transmission */
237 if (sta->sta_state < IEEE80211_STA_ASSOC)
238 return;
239
240 /*
241 * use peer-specific power mode if peering is established and the
242 * peer's power mode is known
243 */
244 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
245 sta->mesh->peer_pm != NL80211_MESH_POWER_UNKNOWN)
246 pm = sta->mesh->peer_pm;
247 else
248 pm = sta->mesh->nonpeer_pm;
249
250 do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);
251
252 /* clear the MPSP flags for non-peers or active STA */
253 if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
254 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
255 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
256 } else if (!do_buffer) {
257 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
258 }
259
260 /* Don't let the same PS state be set twice */
261 if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer)
262 return;
263
264 if (do_buffer) {
265 set_sta_flag(sta, WLAN_STA_PS_STA);
266 atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps);
267 mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n",
268 sta->sta.addr);
269 } else {
270 ieee80211_sta_ps_deliver_wakeup(sta);
271 }
272}
273
274static void mps_set_sta_peer_pm(struct sta_info *sta,
275 struct ieee80211_hdr *hdr)
276{
277 enum nl80211_mesh_power_mode pm;
278 u8 *qc = ieee80211_get_qos_ctl(hdr);
279
280 /*
281 * Test Power Management field of frame control (PW) and
282 * mesh power save level subfield of QoS control field (PSL)
283 *
284 * | PM | PSL| Mesh PM |
285 * +----+----+---------+
286 * | 0 |Rsrv| Active |
287 * | 1 | 0 | Light |
288 * | 1 | 1 | Deep |
289 */
290 if (ieee80211_has_pm(hdr->frame_control)) {
291 if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8))
292 pm = NL80211_MESH_POWER_DEEP_SLEEP;
293 else
294 pm = NL80211_MESH_POWER_LIGHT_SLEEP;
295 } else {
296 pm = NL80211_MESH_POWER_ACTIVE;
297 }
298
299 if (sta->mesh->peer_pm == pm)
300 return;
301
302 mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
303 sta->sta.addr, pm);
304
305 sta->mesh->peer_pm = pm;
306
307 ieee80211_mps_sta_status_update(sta);
308}
309
310static void mps_set_sta_nonpeer_pm(struct sta_info *sta,
311 struct ieee80211_hdr *hdr)
312{
313 enum nl80211_mesh_power_mode pm;
314
315 if (ieee80211_has_pm(hdr->frame_control))
316 pm = NL80211_MESH_POWER_DEEP_SLEEP;
317 else
318 pm = NL80211_MESH_POWER_ACTIVE;
319
320 if (sta->mesh->nonpeer_pm == pm)
321 return;
322
323 mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
324 sta->sta.addr, pm);
325
326 sta->mesh->nonpeer_pm = pm;
327
328 ieee80211_mps_sta_status_update(sta);
329}
330
331/**
332 * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
333 *
334 * @sta: STA info that transmitted the frame
335 * @hdr: IEEE 802.11 (QoS) Header
336 */
337void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
338 struct ieee80211_hdr *hdr)
339{
340 if (is_unicast_ether_addr(hdr->addr1) &&
341 ieee80211_is_data_qos(hdr->frame_control)) {
342 /*
343 * individually addressed QoS Data/Null frames contain
344 * peer link-specific PS mode towards the local STA
345 */
346 mps_set_sta_peer_pm(sta, hdr);
347
348 /* check for mesh Peer Service Period trigger frames */
349 ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr),
350 sta, false, false);
351 } else {
352 /*
353 * can only determine non-peer PS mode
354 * (see IEEE802.11-2012 8.2.4.1.7)
355 */
356 mps_set_sta_nonpeer_pm(sta, hdr);
357 }
358}
359
360
361/* mesh PS frame release */
362
363static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp)
364{
365 struct ieee80211_sub_if_data *sdata = sta->sdata;
366 struct sk_buff *skb;
367 struct ieee80211_hdr *nullfunc;
368 struct ieee80211_tx_info *info;
369 u8 *qc;
370
371 skb = mps_qos_null_get(sta);
372 if (!skb)
373 return;
374
375 nullfunc = (struct ieee80211_hdr *) skb->data;
376 if (!eosp)
377 nullfunc->frame_control |=
378 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
379 /*
380 * | RSPI | EOSP | MPSP triggering |
381 * +------+------+--------------------+
382 * | 0 | 0 | local STA is owner |
383 * | 0 | 1 | no MPSP (MPSP end) |
384 * | 1 | 0 | both STA are owner |
385 * | 1 | 1 | peer STA is owner | see IEEE802.11-2012 13.14.9.2
386 */
387 qc = ieee80211_get_qos_ctl(nullfunc);
388 if (rspi)
389 qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8);
390 if (eosp)
391 qc[0] |= IEEE80211_QOS_CTL_EOSP;
392
393 info = IEEE80211_SKB_CB(skb);
394
395 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
396 IEEE80211_TX_CTL_REQ_TX_STATUS;
397
398 mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n",
399 rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr);
400
401 ieee80211_tx_skb(sdata, skb);
402}
403
404/**
405 * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
406 *
407 * To properly end a mesh MPSP the last transmitted frame has to set the EOSP
408 * flag in the QoS Control field. In case the current tailing frame is not a
409 * QoS Data frame, append a QoS Null to carry the flag.
410 */
411static void mpsp_qos_null_append(struct sta_info *sta,
412 struct sk_buff_head *frames)
413{
414 struct ieee80211_sub_if_data *sdata = sta->sdata;
415 struct sk_buff *new_skb, *skb = skb_peek_tail(frames);
416 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
417 struct ieee80211_tx_info *info;
418
419 if (ieee80211_is_data_qos(hdr->frame_control))
420 return;
421
422 new_skb = mps_qos_null_get(sta);
423 if (!new_skb)
424 return;
425
426 mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n",
427 sta->sta.addr);
428 /*
429 * This frame has to be transmitted last. Assign lowest priority to
430 * make sure it cannot pass other frames when releasing multiple ACs.
431 */
432 new_skb->priority = 1;
433 skb_set_queue_mapping(new_skb, IEEE80211_AC_BK);
434 ieee80211_set_qos_hdr(sdata, new_skb);
435
436 info = IEEE80211_SKB_CB(new_skb);
437 info->control.vif = &sdata->vif;
438 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
439
440 __skb_queue_tail(frames, new_skb);
441}
442
443/**
444 * mps_frame_deliver - transmit frames during mesh powersave
445 *
446 * @sta: STA info to transmit to
447 * @n_frames: number of frames to transmit. -1 for all
448 */
449static void mps_frame_deliver(struct sta_info *sta, int n_frames)
450{
451 struct ieee80211_local *local = sta->sdata->local;
452 int ac;
453 struct sk_buff_head frames;
454 struct sk_buff *skb;
455 bool more_data = false;
456
457 skb_queue_head_init(&frames);
458
459 /* collect frame(s) from buffers */
460 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
461 while (n_frames != 0) {
462 skb = skb_dequeue(&sta->tx_filtered[ac]);
463 if (!skb) {
464 skb = skb_dequeue(
465 &sta->ps_tx_buf[ac]);
466 if (skb)
467 local->total_ps_buffered--;
468 }
469 if (!skb)
470 break;
471 n_frames--;
472 __skb_queue_tail(&frames, skb);
473 }
474
475 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
476 !skb_queue_empty(&sta->ps_tx_buf[ac]))
477 more_data = true;
478 }
479
480 /* nothing to send? -> EOSP */
481 if (skb_queue_empty(&frames)) {
482 mpsp_trigger_send(sta, false, true);
483 return;
484 }
485
486 /* in a MPSP make sure the last skb is a QoS Data frame */
487 if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
488 mpsp_qos_null_append(sta, &frames);
489
490 mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n",
491 skb_queue_len(&frames), sta->sta.addr);
492
493 /* prepare collected frames for transmission */
494 skb_queue_walk(&frames, skb) {
495 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
496 struct ieee80211_hdr *hdr = (void *) skb->data;
497
498 /*
499 * Tell TX path to send this frame even though the
500 * STA may still remain is PS mode after this frame
501 * exchange.
502 */
503 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
504
505 if (more_data || !skb_queue_is_last(&frames, skb))
506 hdr->frame_control |=
507 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
508 else
509 hdr->frame_control &=
510 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
511
512 if (skb_queue_is_last(&frames, skb) &&
513 ieee80211_is_data_qos(hdr->frame_control)) {
514 u8 *qoshdr = ieee80211_get_qos_ctl(hdr);
515
516 /* MPSP trigger frame ends service period */
517 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
518 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
519 }
520 }
521
522 ieee80211_add_pending_skbs(local, &frames);
523 sta_info_recalc_tim(sta);
524}
525
526/**
527 * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
528 *
529 * @qc: QoS Control field
530 * @sta: peer to start a MPSP with
531 * @tx: frame was transmitted by the local STA
532 * @acked: frame has been transmitted successfully
533 *
534 * NOTE: active mode STA may only serve as MPSP owner
535 */
536void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
537 bool tx, bool acked)
538{
539 u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8);
540 u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP;
541
542 if (tx) {
543 if (rspi && acked)
544 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
545
546 if (eosp)
547 clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
548 else if (acked &&
549 test_sta_flag(sta, WLAN_STA_PS_STA) &&
550 !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
551 mps_frame_deliver(sta, -1);
552 } else {
553 if (eosp)
554 clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
555 else if (sta->mesh->local_pm != NL80211_MESH_POWER_ACTIVE)
556 set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
557
558 if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
559 mps_frame_deliver(sta, -1);
560 }
561}
562
563/**
564 * ieee80211_mps_frame_release - release frames buffered due to mesh power save
565 *
566 * @sta: mesh STA
567 * @elems: IEs of beacon or probe response
568 *
569 * For peers if we have individually-addressed frames buffered or the peer
570 * indicates buffered frames, send a corresponding MPSP trigger frame. Since
571 * we do not evaluate the awake window duration, QoS Nulls are used as MPSP
572 * trigger frames. If the neighbour STA is not a peer, only send single frames.
573 */
574void ieee80211_mps_frame_release(struct sta_info *sta,
575 struct ieee802_11_elems *elems)
576{
577 int ac, buffer_local = 0;
578 bool has_buffered = false;
579
580 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
581 has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
582 sta->mesh->aid);
583
584 if (has_buffered)
585 mps_dbg(sta->sdata, "%pM indicates buffered frames\n",
586 sta->sta.addr);
587
588 /* only transmit to PS STA with announced, non-zero awake window */
589 if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
590 (!elems->awake_window || !le16_to_cpu(*elems->awake_window)))
591 return;
592
593 if (!test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
594 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
595 buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) +
596 skb_queue_len(&sta->tx_filtered[ac]);
597
598 if (!has_buffered && !buffer_local)
599 return;
600
601 if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
602 mpsp_trigger_send(sta, has_buffered, !buffer_local);
603 else
604 mps_frame_deliver(sta, 1);
605}