1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Copyright (C) 2018-2025 Intel Corporation
9 *
10 * Transmit and frame generation functions.
11 */
12
13#include <linux/kernel.h>
14#include <linux/slab.h>
15#include <linux/skbuff.h>
16#include <linux/if_vlan.h>
17#include <linux/etherdevice.h>
18#include <linux/bitmap.h>
19#include <linux/rcupdate.h>
20#include <linux/export.h>
21#include <net/net_namespace.h>
22#include <net/ieee80211_radiotap.h>
23#include <net/cfg80211.h>
24#include <net/mac80211.h>
25#include <net/codel.h>
26#include <net/codel_impl.h>
27#include <linux/unaligned.h>
28#include <net/fq_impl.h>
29#include <net/sock.h>
30#include <net/gso.h>
31
32#include "ieee80211_i.h"
33#include "driver-ops.h"
34#include "led.h"
35#include "mesh.h"
36#include "wep.h"
37#include "wpa.h"
38#include "wme.h"
39#include "rate.h"
40
41/* misc utils */
42
43static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
44 struct sk_buff *skb, int group_addr,
45 int next_frag_len)
46{
47 int rate, mrate, erp, dur, i;
48 struct ieee80211_rate *txrate;
49 struct ieee80211_local *local = tx->local;
50 struct ieee80211_supported_band *sband;
51 struct ieee80211_hdr *hdr;
52 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
53
54 /* assume HW handles this */
55 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
56 return 0;
57
58 /* uh huh? */
59 if (WARN_ON_ONCE(tx->rate.idx < 0))
60 return 0;
61
62 if (info->band >= NUM_NL80211_BANDS)
63 return 0;
64
65 sband = local->hw.wiphy->bands[info->band];
66 txrate = &sband->bitrates[tx->rate.idx];
67
68 erp = txrate->flags & IEEE80211_RATE_ERP_G;
69
70 /* device is expected to do this */
71 if (sband->band == NL80211_BAND_S1GHZ)
72 return 0;
73
74 /*
75 * data and mgmt (except PS Poll):
76 * - during CFP: 32768
77 * - during contention period:
78 * if addr1 is group address: 0
79 * if more fragments = 0 and addr1 is individual address: time to
80 * transmit one ACK plus SIFS
81 * if more fragments = 1 and addr1 is individual address: time to
82 * transmit next fragment plus 2 x ACK plus 3 x SIFS
83 *
84 * IEEE 802.11, 9.6:
85 * - control response frame (CTS or ACK) shall be transmitted using the
86 * same rate as the immediately previous frame in the frame exchange
87 * sequence, if this rate belongs to the PHY mandatory rates, or else
88 * at the highest possible rate belonging to the PHY rates in the
89 * BSSBasicRateSet
90 */
91 hdr = (struct ieee80211_hdr *)skb->data;
92 if (ieee80211_is_ctl(fc: hdr->frame_control)) {
93 /* TODO: These control frames are not currently sent by
94 * mac80211, but should they be implemented, this function
95 * needs to be updated to support duration field calculation.
96 *
97 * RTS: time needed to transmit pending data/mgmt frame plus
98 * one CTS frame plus one ACK frame plus 3 x SIFS
99 * CTS: duration of immediately previous RTS minus time
100 * required to transmit CTS and its SIFS
101 * ACK: 0 if immediately previous directed data/mgmt had
102 * more=0, with more=1 duration in ACK frame is duration
103 * from previous frame minus time needed to transmit ACK
104 * and its SIFS
105 * PS Poll: BIT(15) | BIT(14) | aid
106 */
107 return 0;
108 }
109
110 /* data/mgmt */
111 if (0 /* FIX: data/mgmt during CFP */)
112 return cpu_to_le16(32768);
113
114 if (group_addr) /* Group address as the destination - no ACK */
115 return 0;
116
117 /* Individual destination address:
118 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
119 * CTS and ACK frames shall be transmitted using the highest rate in
120 * basic rate set that is less than or equal to the rate of the
121 * immediately previous frame and that is using the same modulation
122 * (CCK or OFDM). If no basic rate set matches with these requirements,
123 * the highest mandatory rate of the PHY that is less than or equal to
124 * the rate of the previous frame is used.
125 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
126 */
127 rate = -1;
128 /* use lowest available if everything fails */
129 mrate = sband->bitrates[0].bitrate;
130 for (i = 0; i < sband->n_bitrates; i++) {
131 struct ieee80211_rate *r = &sband->bitrates[i];
132 u32 flag;
133
134 if (r->bitrate > txrate->bitrate)
135 break;
136
137 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
138 rate = r->bitrate;
139
140 switch (sband->band) {
141 case NL80211_BAND_2GHZ:
142 case NL80211_BAND_LC:
143 if (tx->sdata->deflink.operating_11g_mode)
144 flag = IEEE80211_RATE_MANDATORY_G;
145 else
146 flag = IEEE80211_RATE_MANDATORY_B;
147 break;
148 case NL80211_BAND_5GHZ:
149 case NL80211_BAND_6GHZ:
150 flag = IEEE80211_RATE_MANDATORY_A;
151 break;
152 default:
153 flag = 0;
154 WARN_ON(1);
155 break;
156 }
157
158 if (r->flags & flag)
159 mrate = r->bitrate;
160 }
161 if (rate == -1) {
162 /* No matching basic rate found; use highest suitable mandatory
163 * PHY rate */
164 rate = mrate;
165 }
166
167 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
168 if (ieee80211_is_data_qos(fc: hdr->frame_control) &&
169 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
170 dur = 0;
171 else
172 /* Time needed to transmit ACK
173 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
174 * to closest integer */
175 dur = ieee80211_frame_duration(band: sband->band, len: 10, rate, erp,
176 short_preamble: tx->sdata->vif.bss_conf.use_short_preamble);
177
178 if (next_frag_len) {
179 /* Frame is fragmented: duration increases with time needed to
180 * transmit next fragment plus ACK and 2 x SIFS. */
181 dur *= 2; /* ACK + SIFS */
182 /* next fragment */
183 dur += ieee80211_frame_duration(band: sband->band, len: next_frag_len,
184 rate: txrate->bitrate, erp,
185 short_preamble: tx->sdata->vif.bss_conf.use_short_preamble);
186 }
187
188 return cpu_to_le16(dur);
189}
190
191/* tx handlers */
192static ieee80211_tx_result debug_noinline
193ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
194{
195 struct ieee80211_local *local = tx->local;
196 struct ieee80211_if_managed *ifmgd;
197 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: tx->skb);
198
199 /* driver doesn't support power save */
200 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
201 return TX_CONTINUE;
202
203 /* hardware does dynamic power save */
204 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
205 return TX_CONTINUE;
206
207 /* dynamic power save disabled */
208 if (local->hw.conf.dynamic_ps_timeout <= 0)
209 return TX_CONTINUE;
210
211 /* we are scanning, don't enable power save */
212 if (local->scanning)
213 return TX_CONTINUE;
214
215 if (!local->ps_sdata)
216 return TX_CONTINUE;
217
218 /* No point if we're going to suspend */
219 if (local->quiescing)
220 return TX_CONTINUE;
221
222 /* dynamic ps is supported only in managed mode */
223 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
224 return TX_CONTINUE;
225
226 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK))
227 return TX_CONTINUE;
228
229 ifmgd = &tx->sdata->u.mgd;
230
231 /*
232 * Don't wakeup from power save if u-apsd is enabled, voip ac has
233 * u-apsd enabled and the frame is in voip class. This effectively
234 * means that even if all access categories have u-apsd enabled, in
235 * practise u-apsd is only used with the voip ac. This is a
236 * workaround for the case when received voip class packets do not
237 * have correct qos tag for some reason, due the network or the
238 * peer application.
239 *
240 * Note: ifmgd->uapsd_queues access is racy here. If the value is
241 * changed via debugfs, user needs to reassociate manually to have
242 * everything in sync.
243 */
244 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
245 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
246 skb_get_queue_mapping(skb: tx->skb) == IEEE80211_AC_VO)
247 return TX_CONTINUE;
248
249 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
250 ieee80211_stop_queues_by_reason(hw: &local->hw,
251 queues: IEEE80211_MAX_QUEUE_MAP,
252 reason: IEEE80211_QUEUE_STOP_REASON_PS,
253 refcounted: false);
254 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
255 wiphy_work_queue(wiphy: local->hw.wiphy,
256 work: &local->dynamic_ps_disable_work);
257 }
258
259 /* Don't restart the timer if we're not disassociated */
260 if (!ifmgd->associated)
261 return TX_CONTINUE;
262
263 mod_timer(timer: &local->dynamic_ps_timer, expires: jiffies +
264 msecs_to_jiffies(m: local->hw.conf.dynamic_ps_timeout));
265
266 return TX_CONTINUE;
267}
268
269static ieee80211_tx_result debug_noinline
270ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
271{
272
273 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
274 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: tx->skb);
275 bool assoc = false;
276
277 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
278 return TX_CONTINUE;
279
280 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
281 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
282 !ieee80211_is_probe_req(fc: hdr->frame_control) &&
283 !ieee80211_is_any_nullfunc(fc: hdr->frame_control))
284 /*
285 * When software scanning only nullfunc frames (to notify
286 * the sleep state to the AP) and probe requests (for the
287 * active scan) are allowed, all other frames should not be
288 * sent and we should not get here, but if we do
289 * nonetheless, drop them to avoid sending them
290 * off-channel. See the link below and
291 * ieee80211_start_scan() for more.
292 *
293 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
294 */
295 return TX_DROP;
296
297 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
298 return TX_CONTINUE;
299
300 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
301 return TX_CONTINUE;
302
303 if (tx->sta)
304 assoc = test_sta_flag(sta: tx->sta, flag: WLAN_STA_ASSOC);
305
306 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
307 if (unlikely(!assoc &&
308 ieee80211_is_data(hdr->frame_control))) {
309#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
310 sdata_info(tx->sdata,
311 "dropped data frame to not associated station %pM\n",
312 hdr->addr1);
313#endif
314 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
315 return TX_DROP;
316 }
317 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
318 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
319 /*
320 * No associated STAs - no need to send multicast
321 * frames.
322 */
323 return TX_DROP;
324 }
325
326 return TX_CONTINUE;
327}
328
329/* This function is called whenever the AP is about to exceed the maximum limit
330 * of buffered frames for power saving STAs. This situation should not really
331 * happen often during normal operation, so dropping the oldest buffered packet
332 * from each queue should be OK to make some room for new frames. */
333static void purge_old_ps_buffers(struct ieee80211_local *local)
334{
335 int total = 0, purged = 0;
336 struct sk_buff *skb;
337 struct ieee80211_sub_if_data *sdata;
338 struct sta_info *sta;
339
340 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
341 struct ps_data *ps;
342
343 if (sdata->vif.type == NL80211_IFTYPE_AP)
344 ps = &sdata->u.ap.ps;
345 else if (ieee80211_vif_is_mesh(vif: &sdata->vif))
346 ps = &sdata->u.mesh.ps;
347 else
348 continue;
349
350 skb = skb_dequeue(list: &ps->bc_buf);
351 if (skb) {
352 purged++;
353 ieee80211_free_txskb(hw: &local->hw, skb);
354 }
355 total += skb_queue_len(list_: &ps->bc_buf);
356 }
357
358 /*
359 * Drop one frame from each station from the lowest-priority
360 * AC that has frames at all.
361 */
362 list_for_each_entry_rcu(sta, &local->sta_list, list) {
363 int ac;
364
365 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
366 skb = skb_dequeue(list: &sta->ps_tx_buf[ac]);
367 total += skb_queue_len(list_: &sta->ps_tx_buf[ac]);
368 if (skb) {
369 purged++;
370 ieee80211_free_txskb(hw: &local->hw, skb);
371 break;
372 }
373 }
374 }
375
376 local->total_ps_buffered = total;
377 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
378}
379
380static ieee80211_tx_result
381ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
382{
383 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: tx->skb);
384 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
385 struct ps_data *ps;
386
387 /*
388 * broadcast/multicast frame
389 *
390 * If any of the associated/peer stations is in power save mode,
391 * the frame is buffered to be sent after DTIM beacon frame.
392 * This is done either by the hardware or us.
393 */
394
395 /* powersaving STAs currently only in AP/VLAN/mesh mode */
396 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
397 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
398 if (!tx->sdata->bss)
399 return TX_CONTINUE;
400
401 ps = &tx->sdata->bss->ps;
402 } else if (ieee80211_vif_is_mesh(vif: &tx->sdata->vif)) {
403 ps = &tx->sdata->u.mesh.ps;
404 } else {
405 return TX_CONTINUE;
406 }
407
408
409 /* no buffering for ordered frames */
410 if (ieee80211_has_order(fc: hdr->frame_control))
411 return TX_CONTINUE;
412
413 if (ieee80211_is_probe_req(fc: hdr->frame_control))
414 return TX_CONTINUE;
415
416 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
417 info->hw_queue = tx->sdata->vif.cab_queue;
418
419 /* no stations in PS mode and no buffered packets */
420 if (!atomic_read(v: &ps->num_sta_ps) && skb_queue_empty(list: &ps->bc_buf))
421 return TX_CONTINUE;
422
423 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
424
425 /* device releases frame after DTIM beacon */
426 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
427 return TX_CONTINUE;
428
429 /* buffered in mac80211 */
430 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
431 purge_old_ps_buffers(local: tx->local);
432
433 if (skb_queue_len(list_: &ps->bc_buf) >= AP_MAX_BC_BUFFER) {
434 ps_dbg(tx->sdata,
435 "BC TX buffer full - dropping the oldest frame\n");
436 ieee80211_free_txskb(hw: &tx->local->hw, skb: skb_dequeue(list: &ps->bc_buf));
437 } else
438 tx->local->total_ps_buffered++;
439
440 skb_queue_tail(list: &ps->bc_buf, newsk: tx->skb);
441
442 return TX_QUEUED;
443}
444
445static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
446 struct sk_buff *skb)
447{
448 if (!ieee80211_is_mgmt(fc))
449 return 0;
450
451 if (sta == NULL || !test_sta_flag(sta, flag: WLAN_STA_MFP))
452 return 0;
453
454 if (!ieee80211_is_robust_mgmt_frame(skb))
455 return 0;
456
457 return 1;
458}
459
460static ieee80211_tx_result
461ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
462{
463 struct sta_info *sta = tx->sta;
464 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: tx->skb);
465 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
466 struct ieee80211_local *local = tx->local;
467
468 if (unlikely(!sta))
469 return TX_CONTINUE;
470
471 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
472 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
473 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
474 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
475 int ac = skb_get_queue_mapping(skb: tx->skb);
476
477 if (ieee80211_is_mgmt(fc: hdr->frame_control) &&
478 !ieee80211_is_bufferable_mmpdu(skb: tx->skb)) {
479 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
480 return TX_CONTINUE;
481 }
482
483 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
484 sta->sta.addr, sta->sta.aid, ac);
485 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
486 purge_old_ps_buffers(local: tx->local);
487
488 /* sync with ieee80211_sta_ps_deliver_wakeup */
489 spin_lock(lock: &sta->ps_lock);
490 /*
491 * STA woke up the meantime and all the frames on ps_tx_buf have
492 * been queued to pending queue. No reordering can happen, go
493 * ahead and Tx the packet.
494 */
495 if (!test_sta_flag(sta, flag: WLAN_STA_PS_STA) &&
496 !test_sta_flag(sta, flag: WLAN_STA_PS_DRIVER) &&
497 !test_sta_flag(sta, flag: WLAN_STA_PS_DELIVER)) {
498 spin_unlock(lock: &sta->ps_lock);
499 return TX_CONTINUE;
500 }
501
502 if (skb_queue_len(list_: &sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
503 struct sk_buff *old = skb_dequeue(list: &sta->ps_tx_buf[ac]);
504 ps_dbg(tx->sdata,
505 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
506 sta->sta.addr, ac);
507 ieee80211_free_txskb(hw: &local->hw, skb: old);
508 } else
509 tx->local->total_ps_buffered++;
510
511 info->control.jiffies = jiffies;
512 info->control.vif = &tx->sdata->vif;
513 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
514 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
515 skb_queue_tail(list: &sta->ps_tx_buf[ac], newsk: tx->skb);
516 spin_unlock(lock: &sta->ps_lock);
517
518 if (!timer_pending(timer: &local->sta_cleanup))
519 mod_timer(timer: &local->sta_cleanup,
520 expires: round_jiffies(j: jiffies +
521 STA_INFO_CLEANUP_INTERVAL));
522
523 /*
524 * We queued up some frames, so the TIM bit might
525 * need to be set, recalculate it.
526 */
527 sta_info_recalc_tim(sta);
528
529 return TX_QUEUED;
530 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
531 ps_dbg(tx->sdata,
532 "STA %pM in PS mode, but polling/in SP -> send frame\n",
533 sta->sta.addr);
534 }
535
536 return TX_CONTINUE;
537}
538
539static ieee80211_tx_result debug_noinline
540ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
541{
542 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
543 return TX_CONTINUE;
544
545 if (tx->flags & IEEE80211_TX_UNICAST)
546 return ieee80211_tx_h_unicast_ps_buf(tx);
547 else
548 return ieee80211_tx_h_multicast_ps_buf(tx);
549}
550
551static ieee80211_tx_result debug_noinline
552ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
553{
554 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: tx->skb);
555
556 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
557 if (tx->sdata->control_port_no_encrypt)
558 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
559 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
560 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
561 }
562
563 return TX_CONTINUE;
564}
565
566static struct ieee80211_key *
567ieee80211_select_link_key(struct ieee80211_tx_data *tx)
568{
569 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
570 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: tx->skb);
571 struct ieee80211_link_data *link;
572 unsigned int link_id;
573
574 link_id = u32_get_bits(v: info->control.flags, field: IEEE80211_TX_CTRL_MLO_LINK);
575 if (link_id == IEEE80211_LINK_UNSPECIFIED) {
576 link = &tx->sdata->deflink;
577 } else {
578 link = rcu_dereference(tx->sdata->link[link_id]);
579 if (!link)
580 return NULL;
581 }
582
583 if (ieee80211_is_group_privacy_action(skb: tx->skb))
584 return rcu_dereference(link->default_multicast_key);
585 else if (ieee80211_is_mgmt(fc: hdr->frame_control) &&
586 is_multicast_ether_addr(addr: hdr->addr1) &&
587 ieee80211_is_robust_mgmt_frame(skb: tx->skb))
588 return rcu_dereference(link->default_mgmt_key);
589 else if (is_multicast_ether_addr(addr: hdr->addr1))
590 return rcu_dereference(link->default_multicast_key);
591
592 return NULL;
593}
594
595static ieee80211_tx_result debug_noinline
596ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
597{
598 struct ieee80211_key *key;
599 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: tx->skb);
600 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
601
602 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) {
603 tx->key = NULL;
604 return TX_CONTINUE;
605 }
606
607 if (tx->sta &&
608 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
609 tx->key = key;
610 else if ((key = ieee80211_select_link_key(tx)))
611 tx->key = key;
612 else if (!is_multicast_ether_addr(addr: hdr->addr1) &&
613 (key = rcu_dereference(tx->sdata->default_unicast_key)))
614 tx->key = key;
615 else
616 tx->key = NULL;
617
618 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
619 if (tx->key && tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
620 info->control.hw_key = &tx->key->conf;
621 return TX_CONTINUE;
622 }
623
624 if (tx->key) {
625 bool skip_hw = false;
626
627 /* TODO: add threshold stuff again */
628
629 switch (tx->key->conf.cipher) {
630 case WLAN_CIPHER_SUITE_WEP40:
631 case WLAN_CIPHER_SUITE_WEP104:
632 case WLAN_CIPHER_SUITE_TKIP:
633 if (!ieee80211_is_data_present(fc: hdr->frame_control))
634 tx->key = NULL;
635 break;
636 case WLAN_CIPHER_SUITE_CCMP:
637 case WLAN_CIPHER_SUITE_CCMP_256:
638 case WLAN_CIPHER_SUITE_GCMP:
639 case WLAN_CIPHER_SUITE_GCMP_256:
640 if (!ieee80211_is_data_present(fc: hdr->frame_control) &&
641 !ieee80211_use_mfp(fc: hdr->frame_control, sta: tx->sta,
642 skb: tx->skb) &&
643 !ieee80211_is_group_privacy_action(skb: tx->skb))
644 tx->key = NULL;
645 else
646 skip_hw = (tx->key->conf.flags &
647 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
648 ieee80211_is_mgmt(fc: hdr->frame_control);
649 break;
650 case WLAN_CIPHER_SUITE_AES_CMAC:
651 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
652 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
653 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
654 if (!ieee80211_is_mgmt(fc: hdr->frame_control))
655 tx->key = NULL;
656 break;
657 }
658
659 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
660 !ieee80211_is_deauth(hdr->frame_control)) &&
661 tx->skb->protocol != tx->sdata->control_port_protocol)
662 return TX_DROP;
663
664 if (!skip_hw && tx->key &&
665 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
666 info->control.hw_key = &tx->key->conf;
667 } else if (ieee80211_is_data_present(fc: hdr->frame_control) && tx->sta &&
668 test_sta_flag(sta: tx->sta, flag: WLAN_STA_USES_ENCRYPTION)) {
669 return TX_DROP;
670 }
671
672 return TX_CONTINUE;
673}
674
675static ieee80211_tx_result debug_noinline
676ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
677{
678 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: tx->skb);
679 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
680 struct ieee80211_supported_band *sband;
681 u32 len;
682 struct ieee80211_tx_rate_control txrc;
683 struct ieee80211_sta_rates *ratetbl = NULL;
684 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP;
685 bool assoc = false;
686
687 memset(s: &txrc, c: 0, n: sizeof(txrc));
688
689 if (info->band < NUM_NL80211_BANDS)
690 sband = tx->local->hw.wiphy->bands[info->band];
691 else
692 return TX_CONTINUE;
693
694 len = min_t(u32, tx->skb->len + FCS_LEN,
695 tx->local->hw.wiphy->frag_threshold);
696
697 /* set up the tx rate control struct we give the RC algo */
698 txrc.hw = &tx->local->hw;
699 txrc.sband = sband;
700 txrc.bss_conf = &tx->sdata->vif.bss_conf;
701 txrc.skb = tx->skb;
702 txrc.reported_rate.idx = -1;
703
704 if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) {
705 txrc.rate_idx_mask = ~0;
706 } else {
707 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
708
709 if (tx->sdata->rc_has_mcs_mask[info->band])
710 txrc.rate_idx_mcs_mask =
711 tx->sdata->rc_rateidx_mcs_mask[info->band];
712 }
713
714 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
715 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
716 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
717 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
718
719 /* set up RTS protection if desired */
720 if (len > tx->local->hw.wiphy->rts_threshold) {
721 txrc.rts = true;
722 }
723
724 info->control.use_rts = txrc.rts;
725 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
726
727 /*
728 * Use short preamble if the BSS can handle it, but not for
729 * management frames unless we know the receiver can handle
730 * that -- the management frame might be to a station that
731 * just wants a probe response.
732 */
733 if (tx->sdata->vif.bss_conf.use_short_preamble &&
734 (ieee80211_is_tx_data(skb: tx->skb) ||
735 (tx->sta && test_sta_flag(sta: tx->sta, flag: WLAN_STA_SHORT_PREAMBLE))))
736 txrc.short_preamble = true;
737
738 info->control.short_preamble = txrc.short_preamble;
739
740 /* don't ask rate control when rate already injected via radiotap */
741 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
742 return TX_CONTINUE;
743
744 if (tx->sta)
745 assoc = test_sta_flag(sta: tx->sta, flag: WLAN_STA_ASSOC);
746
747 /*
748 * Lets not bother rate control if we're associated and cannot
749 * talk to the sta. This should not happen.
750 */
751 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
752 !rate_usable_index_exists(sband, &tx->sta->sta),
753 "%s: Dropped data frame as no usable bitrate found while "
754 "scanning and associated. Target station: "
755 "%pM on %d GHz band\n",
756 tx->sdata->name,
757 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1,
758 info->band ? 5 : 2))
759 return TX_DROP;
760
761 /*
762 * If we're associated with the sta at this point we know we can at
763 * least send the frame at the lowest bit rate.
764 */
765 rate_control_get_rate(sdata: tx->sdata, sta: tx->sta, txrc: &txrc);
766
767 if (tx->sta && !info->control.skip_table)
768 ratetbl = rcu_dereference(tx->sta->sta.rates);
769
770 if (unlikely(info->control.rates[0].idx < 0)) {
771 if (ratetbl) {
772 struct ieee80211_tx_rate rate = {
773 .idx = ratetbl->rate[0].idx,
774 .flags = ratetbl->rate[0].flags,
775 .count = ratetbl->rate[0].count
776 };
777
778 if (ratetbl->rate[0].idx < 0)
779 return TX_DROP;
780
781 tx->rate = rate;
782 } else {
783 return TX_DROP;
784 }
785 } else {
786 tx->rate = info->control.rates[0];
787 }
788
789 if (txrc.reported_rate.idx < 0) {
790 txrc.reported_rate = tx->rate;
791 if (tx->sta && ieee80211_is_tx_data(skb: tx->skb))
792 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
793 } else if (tx->sta)
794 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
795
796 if (ratetbl)
797 return TX_CONTINUE;
798
799 if (unlikely(!info->control.rates[0].count))
800 info->control.rates[0].count = 1;
801
802 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
803 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
804 info->control.rates[0].count = 1;
805
806 return TX_CONTINUE;
807}
808
809static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
810{
811 u16 *seq = &sta->tid_seq[tid];
812 __le16 ret = cpu_to_le16(*seq);
813
814 /* Increase the sequence number. */
815 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
816
817 return ret;
818}
819
820static ieee80211_tx_result debug_noinline
821ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
822{
823 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: tx->skb);
824 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
825 int tid;
826
827 /*
828 * Packet injection may want to control the sequence
829 * number, if we have no matching interface then we
830 * neither assign one ourselves nor ask the driver to.
831 */
832 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
833 return TX_CONTINUE;
834
835 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
836 return TX_CONTINUE;
837
838 if (ieee80211_hdrlen(fc: hdr->frame_control) < 24)
839 return TX_CONTINUE;
840
841 if (ieee80211_is_qos_nullfunc(fc: hdr->frame_control))
842 return TX_CONTINUE;
843
844 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO)
845 return TX_CONTINUE;
846
847 /* SNS11 from 802.11be 10.3.2.14 */
848 if (unlikely(is_multicast_ether_addr(hdr->addr1) &&
849 ieee80211_vif_is_mld(info->control.vif) &&
850 info->control.vif->type == NL80211_IFTYPE_AP)) {
851 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX)
852 tx->sdata->mld_mcast_seq += 0x10;
853 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq);
854 return TX_CONTINUE;
855 }
856
857 /*
858 * Anything but QoS data that has a sequence number field
859 * (is long enough) gets a sequence number from the global
860 * counter. QoS data frames with a multicast destination
861 * also use the global counter (802.11-2012 9.3.2.10).
862 */
863 if (!ieee80211_is_data_qos(fc: hdr->frame_control) ||
864 is_multicast_ether_addr(addr: hdr->addr1)) {
865 /* driver should assign sequence number */
866 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
867 /* for pure STA mode without beacons, we can do it */
868 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
869 tx->sdata->sequence_number += 0x10;
870 if (tx->sta)
871 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++;
872 return TX_CONTINUE;
873 }
874
875 /*
876 * This should be true for injected/management frames only, for
877 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
878 * above since they are not QoS-data frames.
879 */
880 if (!tx->sta)
881 return TX_CONTINUE;
882
883 /* include per-STA, per-TID sequence counter */
884 tid = ieee80211_get_tid(hdr);
885 tx->sta->deflink.tx_stats.msdu[tid]++;
886
887 hdr->seq_ctrl = ieee80211_tx_next_seq(sta: tx->sta, tid);
888
889 return TX_CONTINUE;
890}
891
892static int ieee80211_fragment(struct ieee80211_tx_data *tx,
893 struct sk_buff *skb, int hdrlen,
894 int frag_threshold)
895{
896 struct ieee80211_local *local = tx->local;
897 struct ieee80211_tx_info *info;
898 struct sk_buff *tmp;
899 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
900 int pos = hdrlen + per_fragm;
901 int rem = skb->len - hdrlen - per_fragm;
902
903 if (WARN_ON(rem < 0))
904 return -EINVAL;
905
906 /* first fragment was already added to queue by caller */
907
908 while (rem) {
909 int fraglen = per_fragm;
910
911 if (fraglen > rem)
912 fraglen = rem;
913 rem -= fraglen;
914 tmp = dev_alloc_skb(length: local->tx_headroom +
915 frag_threshold +
916 IEEE80211_ENCRYPT_HEADROOM +
917 IEEE80211_ENCRYPT_TAILROOM);
918 if (!tmp)
919 return -ENOMEM;
920
921 __skb_queue_tail(list: &tx->skbs, newsk: tmp);
922
923 skb_reserve(skb: tmp,
924 len: local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM);
925
926 /* copy control information */
927 memcpy(to: tmp->cb, from: skb->cb, len: sizeof(tmp->cb));
928
929 info = IEEE80211_SKB_CB(skb: tmp);
930 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
931 IEEE80211_TX_CTL_FIRST_FRAGMENT);
932
933 if (rem)
934 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
935
936 skb_copy_queue_mapping(to: tmp, from: skb);
937 tmp->priority = skb->priority;
938 tmp->dev = skb->dev;
939
940 /* copy header and data */
941 skb_put_data(skb: tmp, data: skb->data, len: hdrlen);
942 skb_put_data(skb: tmp, data: skb->data + pos, len: fraglen);
943
944 pos += fraglen;
945 }
946
947 /* adjust first fragment's length */
948 skb_trim(skb, len: hdrlen + per_fragm);
949 return 0;
950}
951
952static ieee80211_tx_result debug_noinline
953ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
954{
955 struct sk_buff *skb = tx->skb;
956 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
957 struct ieee80211_hdr *hdr = (void *)skb->data;
958 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
959 int hdrlen;
960 int fragnum;
961
962 /* no matter what happens, tx->skb moves to tx->skbs */
963 __skb_queue_tail(list: &tx->skbs, newsk: skb);
964 tx->skb = NULL;
965
966 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
967 return TX_CONTINUE;
968
969 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
970 return TX_CONTINUE;
971
972 /*
973 * Warn when submitting a fragmented A-MPDU frame and drop it.
974 * This scenario is handled in ieee80211_tx_prepare but extra
975 * caution taken here as fragmented ampdu may cause Tx stop.
976 */
977 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
978 return TX_DROP;
979
980 hdrlen = ieee80211_hdrlen(fc: hdr->frame_control);
981
982 /* internal error, why isn't DONTFRAG set? */
983 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
984 return TX_DROP;
985
986 /*
987 * Now fragment the frame. This will allocate all the fragments and
988 * chain them (using skb as the first fragment) to skb->next.
989 * During transmission, we will remove the successfully transmitted
990 * fragments from this list. When the low-level driver rejects one
991 * of the fragments then we will simply pretend to accept the skb
992 * but store it away as pending.
993 */
994 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
995 return TX_DROP;
996
997 /* update duration/seq/flags of fragments */
998 fragnum = 0;
999
1000 skb_queue_walk(&tx->skbs, skb) {
1001 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
1002
1003 hdr = (void *)skb->data;
1004 info = IEEE80211_SKB_CB(skb);
1005
1006 if (!skb_queue_is_last(list: &tx->skbs, skb)) {
1007 hdr->frame_control |= morefrags;
1008 /*
1009 * No multi-rate retries for fragmented frames, that
1010 * would completely throw off the NAV at other STAs.
1011 */
1012 info->control.rates[1].idx = -1;
1013 info->control.rates[2].idx = -1;
1014 info->control.rates[3].idx = -1;
1015 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
1016 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1017 } else {
1018 hdr->frame_control &= ~morefrags;
1019 }
1020 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
1021 fragnum++;
1022 }
1023
1024 return TX_CONTINUE;
1025}
1026
1027static ieee80211_tx_result debug_noinline
1028ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1029{
1030 struct sk_buff *skb;
1031 int ac = -1;
1032
1033 if (!tx->sta)
1034 return TX_CONTINUE;
1035
1036 skb_queue_walk(&tx->skbs, skb) {
1037 ac = skb_get_queue_mapping(skb);
1038 tx->sta->deflink.tx_stats.bytes[ac] += skb->len;
1039 }
1040 if (ac >= 0)
1041 tx->sta->deflink.tx_stats.packets[ac]++;
1042
1043 return TX_CONTINUE;
1044}
1045
1046static ieee80211_tx_result debug_noinline
1047ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1048{
1049 if (!tx->key)
1050 return TX_CONTINUE;
1051
1052 switch (tx->key->conf.cipher) {
1053 case WLAN_CIPHER_SUITE_WEP40:
1054 case WLAN_CIPHER_SUITE_WEP104:
1055 return ieee80211_crypto_wep_encrypt(tx);
1056 case WLAN_CIPHER_SUITE_TKIP:
1057 return ieee80211_crypto_tkip_encrypt(tx);
1058 case WLAN_CIPHER_SUITE_CCMP:
1059 return ieee80211_crypto_ccmp_encrypt(
1060 tx, IEEE80211_CCMP_MIC_LEN);
1061 case WLAN_CIPHER_SUITE_CCMP_256:
1062 return ieee80211_crypto_ccmp_encrypt(
1063 tx, IEEE80211_CCMP_256_MIC_LEN);
1064 case WLAN_CIPHER_SUITE_AES_CMAC:
1065 return ieee80211_crypto_aes_cmac_encrypt(tx);
1066 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1067 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1068 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1069 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1070 return ieee80211_crypto_aes_gmac_encrypt(tx);
1071 case WLAN_CIPHER_SUITE_GCMP:
1072 case WLAN_CIPHER_SUITE_GCMP_256:
1073 return ieee80211_crypto_gcmp_encrypt(tx);
1074 }
1075
1076 return TX_DROP;
1077}
1078
1079static ieee80211_tx_result debug_noinline
1080ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1081{
1082 struct sk_buff *skb;
1083 struct ieee80211_hdr *hdr;
1084 int next_len;
1085 bool group_addr;
1086
1087 skb_queue_walk(&tx->skbs, skb) {
1088 hdr = (void *) skb->data;
1089 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1090 break; /* must not overwrite AID */
1091 if (!skb_queue_is_last(list: &tx->skbs, skb)) {
1092 struct sk_buff *next = skb_queue_next(list: &tx->skbs, skb);
1093 next_len = next->len;
1094 } else
1095 next_len = 0;
1096 group_addr = is_multicast_ether_addr(addr: hdr->addr1);
1097
1098 hdr->duration_id =
1099 ieee80211_duration(tx, skb, group_addr, next_frag_len: next_len);
1100 }
1101
1102 return TX_CONTINUE;
1103}
1104
1105/* actual transmit path */
1106
1107static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1108 struct sk_buff *skb,
1109 struct ieee80211_tx_info *info,
1110 struct tid_ampdu_tx *tid_tx,
1111 int tid)
1112{
1113 bool queued = false;
1114 bool reset_agg_timer = false;
1115 struct sk_buff *purge_skb = NULL;
1116
1117 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1118 reset_agg_timer = true;
1119 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1120 /*
1121 * nothing -- this aggregation session is being started
1122 * but that might still fail with the driver
1123 */
1124 } else if (!tx->sta->sta.txq[tid]) {
1125 spin_lock(lock: &tx->sta->lock);
1126 /*
1127 * Need to re-check now, because we may get here
1128 *
1129 * 1) in the window during which the setup is actually
1130 * already done, but not marked yet because not all
1131 * packets are spliced over to the driver pending
1132 * queue yet -- if this happened we acquire the lock
1133 * either before or after the splice happens, but
1134 * need to recheck which of these cases happened.
1135 *
1136 * 2) during session teardown, if the OPERATIONAL bit
1137 * was cleared due to the teardown but the pointer
1138 * hasn't been assigned NULL yet (or we loaded it
1139 * before it was assigned) -- in this case it may
1140 * now be NULL which means we should just let the
1141 * packet pass through because splicing the frames
1142 * back is already done.
1143 */
1144 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1145
1146 if (!tid_tx) {
1147 /* do nothing, let packet pass through */
1148 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1149 reset_agg_timer = true;
1150 } else {
1151 queued = true;
1152 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1153 clear_sta_flag(sta: tx->sta, flag: WLAN_STA_SP);
1154 ps_dbg(tx->sta->sdata,
1155 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1156 tx->sta->sta.addr, tx->sta->sta.aid);
1157 }
1158 info->control.vif = &tx->sdata->vif;
1159 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1160 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1161 __skb_queue_tail(list: &tid_tx->pending, newsk: skb);
1162 if (skb_queue_len(list_: &tid_tx->pending) > STA_MAX_TX_BUFFER)
1163 purge_skb = __skb_dequeue(list: &tid_tx->pending);
1164 }
1165 spin_unlock(lock: &tx->sta->lock);
1166
1167 if (purge_skb)
1168 ieee80211_free_txskb(hw: &tx->local->hw, skb: purge_skb);
1169 }
1170
1171 /* reset session timer */
1172 if (reset_agg_timer)
1173 tid_tx->last_tx = jiffies;
1174
1175 return queued;
1176}
1177
1178void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata,
1179 struct sta_info *sta, struct sk_buff *skb)
1180{
1181 struct rate_control_ref *ref = sdata->local->rate_ctrl;
1182 u16 tid;
1183
1184 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER))
1185 return;
1186
1187 if (!sta ||
1188 (!sta->sta.valid_links && !sta->sta.deflink.ht_cap.ht_supported &&
1189 !sta->sta.deflink.s1g_cap.s1g) ||
1190 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO ||
1191 skb->protocol == sdata->control_port_protocol)
1192 return;
1193
1194 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1195 if (likely(sta->ampdu_mlme.tid_tx[tid]))
1196 return;
1197
1198 ieee80211_start_tx_ba_session(sta: &sta->sta, tid, timeout: 0);
1199}
1200
1201/*
1202 * initialises @tx
1203 * pass %NULL for the station if unknown, a valid pointer if known
1204 * or an ERR_PTR() if the station is known not to exist
1205 */
1206static ieee80211_tx_result
1207ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1208 struct ieee80211_tx_data *tx,
1209 struct sta_info *sta, struct sk_buff *skb)
1210{
1211 struct ieee80211_local *local = sdata->local;
1212 struct ieee80211_hdr *hdr;
1213 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1214 bool aggr_check = false;
1215 int tid;
1216
1217 memset(s: tx, c: 0, n: sizeof(*tx));
1218 tx->skb = skb;
1219 tx->local = local;
1220 tx->sdata = sdata;
1221 __skb_queue_head_init(list: &tx->skbs);
1222
1223 /*
1224 * If this flag is set to true anywhere, and we get here,
1225 * we are doing the needed processing, so remove the flag
1226 * now.
1227 */
1228 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1229
1230 hdr = (struct ieee80211_hdr *) skb->data;
1231
1232 if (likely(sta)) {
1233 if (!IS_ERR(ptr: sta))
1234 tx->sta = sta;
1235 } else {
1236 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1237 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1238 if (!tx->sta && sdata->wdev.use_4addr)
1239 return TX_DROP;
1240 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) {
1241 tx->sta = sta_info_get_bss(sdata, addr: hdr->addr1);
1242 }
1243 if (!tx->sta && !is_multicast_ether_addr(addr: hdr->addr1)) {
1244 tx->sta = sta_info_get(sdata, addr: hdr->addr1);
1245 aggr_check = true;
1246 }
1247 }
1248
1249 if (tx->sta && ieee80211_is_data_qos(fc: hdr->frame_control) &&
1250 !ieee80211_is_qos_nullfunc(fc: hdr->frame_control) &&
1251 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1252 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1253 struct tid_ampdu_tx *tid_tx;
1254
1255 tid = ieee80211_get_tid(hdr);
1256 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1257 if (!tid_tx && aggr_check) {
1258 ieee80211_aggr_check(sdata, sta: tx->sta, skb);
1259 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1260 }
1261
1262 if (tid_tx) {
1263 bool queued;
1264
1265 queued = ieee80211_tx_prep_agg(tx, skb, info,
1266 tid_tx, tid);
1267
1268 if (unlikely(queued))
1269 return TX_QUEUED;
1270 }
1271 }
1272
1273 if (is_multicast_ether_addr(addr: hdr->addr1)) {
1274 tx->flags &= ~IEEE80211_TX_UNICAST;
1275 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1276 } else
1277 tx->flags |= IEEE80211_TX_UNICAST;
1278
1279 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1280 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1281 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1282 info->flags & IEEE80211_TX_CTL_AMPDU)
1283 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1284 }
1285
1286 if (!tx->sta)
1287 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1288 else if (test_and_clear_sta_flag(sta: tx->sta, flag: WLAN_STA_CLEAR_PS_FILT)) {
1289 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1290 ieee80211_check_fast_xmit(sta: tx->sta);
1291 }
1292
1293 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1294
1295 return TX_CONTINUE;
1296}
1297
1298static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1299 struct ieee80211_vif *vif,
1300 struct sta_info *sta,
1301 struct sk_buff *skb)
1302{
1303 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1304 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1305 struct ieee80211_txq *txq = NULL;
1306
1307 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1308 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1309 return NULL;
1310
1311 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
1312 unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
1313 if ((!ieee80211_is_mgmt(fc: hdr->frame_control) ||
1314 ieee80211_is_bufferable_mmpdu(skb) ||
1315 vif->type == NL80211_IFTYPE_STATION) &&
1316 sta && sta->uploaded) {
1317 /*
1318 * This will be NULL if the driver didn't set the
1319 * opt-in hardware flag.
1320 */
1321 txq = sta->sta.txq[IEEE80211_NUM_TIDS];
1322 }
1323 } else if (sta) {
1324 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1325
1326 if (!sta->uploaded)
1327 return NULL;
1328
1329 txq = sta->sta.txq[tid];
1330 } else {
1331 txq = vif->txq;
1332 }
1333
1334 if (!txq)
1335 return NULL;
1336
1337 return to_txq_info(txq);
1338}
1339
1340static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1341{
1342 struct sk_buff *next;
1343 codel_time_t now = codel_get_time();
1344
1345 skb_list_walk_safe(skb, skb, next)
1346 IEEE80211_SKB_CB(skb)->control.enqueue_time = now;
1347}
1348
1349static u32 codel_skb_len_func(const struct sk_buff *skb)
1350{
1351 return skb->len;
1352}
1353
1354static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1355{
1356 const struct ieee80211_tx_info *info;
1357
1358 info = (const struct ieee80211_tx_info *)skb->cb;
1359 return info->control.enqueue_time;
1360}
1361
1362static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1363 void *ctx)
1364{
1365 struct ieee80211_local *local;
1366 struct txq_info *txqi;
1367 struct fq *fq;
1368 struct fq_flow *flow;
1369
1370 txqi = ctx;
1371 local = vif_to_sdata(p: txqi->txq.vif)->local;
1372 fq = &local->fq;
1373
1374 if (cvars == &txqi->def_cvars)
1375 flow = &txqi->tin.default_flow;
1376 else
1377 flow = &fq->flows[cvars - local->cvars];
1378
1379 return fq_flow_dequeue(fq, flow);
1380}
1381
1382static void codel_drop_func(struct sk_buff *skb,
1383 void *ctx)
1384{
1385 struct ieee80211_local *local;
1386 struct ieee80211_hw *hw;
1387 struct txq_info *txqi;
1388
1389 txqi = ctx;
1390 local = vif_to_sdata(p: txqi->txq.vif)->local;
1391 hw = &local->hw;
1392
1393 ieee80211_free_txskb(hw, skb);
1394}
1395
1396static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1397 struct fq_tin *tin,
1398 struct fq_flow *flow)
1399{
1400 struct ieee80211_local *local;
1401 struct txq_info *txqi;
1402 struct codel_vars *cvars;
1403 struct codel_params *cparams;
1404 struct codel_stats *cstats;
1405
1406 local = container_of(fq, struct ieee80211_local, fq);
1407 txqi = container_of(tin, struct txq_info, tin);
1408 cparams = &local->cparams;
1409 cstats = &txqi->cstats;
1410
1411 if (flow == &tin->default_flow)
1412 cvars = &txqi->def_cvars;
1413 else
1414 cvars = &local->cvars[flow - fq->flows];
1415
1416 return codel_dequeue(ctx: txqi,
1417 backlog: &flow->backlog,
1418 params: cparams,
1419 vars: cvars,
1420 stats: cstats,
1421 skb_len_func: codel_skb_len_func,
1422 skb_time_func: codel_skb_time_func,
1423 drop_func: codel_drop_func,
1424 dequeue_func: codel_dequeue_func);
1425}
1426
1427static void fq_skb_free_func(struct fq *fq,
1428 struct fq_tin *tin,
1429 struct fq_flow *flow,
1430 struct sk_buff *skb)
1431{
1432 struct ieee80211_local *local;
1433
1434 local = container_of(fq, struct ieee80211_local, fq);
1435 ieee80211_free_txskb(hw: &local->hw, skb);
1436}
1437
1438static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1439 struct txq_info *txqi,
1440 struct sk_buff *skb)
1441{
1442 struct fq *fq = &local->fq;
1443 struct fq_tin *tin = &txqi->tin;
1444 u32 flow_idx;
1445
1446 ieee80211_set_skb_enqueue_time(skb);
1447
1448 spin_lock_bh(lock: &fq->lock);
1449 /*
1450 * For management frames, don't really apply codel etc.,
1451 * we don't want to apply any shaping or anything we just
1452 * want to simplify the driver API by having them on the
1453 * txqi.
1454 */
1455 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) {
1456 IEEE80211_SKB_CB(skb)->control.flags |=
1457 IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1458 __skb_queue_tail(list: &txqi->frags, newsk: skb);
1459 } else {
1460 flow_idx = fq_flow_idx(fq, skb);
1461 fq_tin_enqueue(fq, tin, idx: flow_idx, skb,
1462 free_func: fq_skb_free_func);
1463 }
1464 spin_unlock_bh(lock: &fq->lock);
1465}
1466
1467static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1468 struct fq_flow *flow, struct sk_buff *skb,
1469 void *data)
1470{
1471 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1472
1473 return info->control.vif == data;
1474}
1475
1476void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1477 struct ieee80211_sub_if_data *sdata)
1478{
1479 struct fq *fq = &local->fq;
1480 struct txq_info *txqi;
1481 struct fq_tin *tin;
1482 struct ieee80211_sub_if_data *ap;
1483
1484 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1485 return;
1486
1487 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1488
1489 if (!ap->vif.txq)
1490 return;
1491
1492 txqi = to_txq_info(txq: ap->vif.txq);
1493 tin = &txqi->tin;
1494
1495 spin_lock_bh(lock: &fq->lock);
1496 fq_tin_filter(fq, tin, filter_func: fq_vlan_filter_func, filter_data: &sdata->vif,
1497 free_func: fq_skb_free_func);
1498 spin_unlock_bh(lock: &fq->lock);
1499}
1500
1501void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1502 struct sta_info *sta,
1503 struct txq_info *txqi, int tid)
1504{
1505 fq_tin_init(tin: &txqi->tin);
1506 codel_vars_init(vars: &txqi->def_cvars);
1507 codel_stats_init(stats: &txqi->cstats);
1508 __skb_queue_head_init(list: &txqi->frags);
1509 INIT_LIST_HEAD(list: &txqi->schedule_order);
1510
1511 txqi->txq.vif = &sdata->vif;
1512
1513 if (!sta) {
1514 sdata->vif.txq = &txqi->txq;
1515 txqi->txq.tid = 0;
1516 txqi->txq.ac = IEEE80211_AC_BE;
1517
1518 return;
1519 }
1520
1521 if (tid == IEEE80211_NUM_TIDS) {
1522 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1523 /* Drivers need to opt in to the management MPDU TXQ */
1524 if (!ieee80211_hw_check(&sdata->local->hw,
1525 STA_MMPDU_TXQ))
1526 return;
1527 } else if (!ieee80211_hw_check(&sdata->local->hw,
1528 BUFF_MMPDU_TXQ)) {
1529 /* Drivers need to opt in to the bufferable MMPDU TXQ */
1530 return;
1531 }
1532 txqi->txq.ac = IEEE80211_AC_VO;
1533 } else {
1534 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1535 }
1536
1537 txqi->txq.sta = &sta->sta;
1538 txqi->txq.tid = tid;
1539 sta->sta.txq[tid] = &txqi->txq;
1540}
1541
1542void ieee80211_txq_purge(struct ieee80211_local *local,
1543 struct txq_info *txqi)
1544{
1545 struct fq *fq = &local->fq;
1546 struct fq_tin *tin = &txqi->tin;
1547
1548 spin_lock_bh(lock: &fq->lock);
1549 fq_tin_reset(fq, tin, free_func: fq_skb_free_func);
1550 ieee80211_purge_tx_queue(hw: &local->hw, skbs: &txqi->frags);
1551 spin_unlock_bh(lock: &fq->lock);
1552
1553 spin_lock_bh(lock: &local->active_txq_lock[txqi->txq.ac]);
1554 list_del_init(entry: &txqi->schedule_order);
1555 spin_unlock_bh(lock: &local->active_txq_lock[txqi->txq.ac]);
1556}
1557
1558void ieee80211_txq_set_params(struct ieee80211_local *local, int radio_idx)
1559{
1560 if (local->hw.wiphy->txq_limit)
1561 local->fq.limit = local->hw.wiphy->txq_limit;
1562 else
1563 local->hw.wiphy->txq_limit = local->fq.limit;
1564
1565 if (local->hw.wiphy->txq_memory_limit)
1566 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1567 else
1568 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1569
1570 if (local->hw.wiphy->txq_quantum)
1571 local->fq.quantum = local->hw.wiphy->txq_quantum;
1572 else
1573 local->hw.wiphy->txq_quantum = local->fq.quantum;
1574}
1575
1576int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1577{
1578 struct fq *fq = &local->fq;
1579 int ret;
1580 int i;
1581 bool supp_vht = false;
1582 enum nl80211_band band;
1583
1584 ret = fq_init(fq, flows_cnt: 4096);
1585 if (ret)
1586 return ret;
1587
1588 /*
1589 * If the hardware doesn't support VHT, it is safe to limit the maximum
1590 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1591 */
1592 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1593 struct ieee80211_supported_band *sband;
1594
1595 sband = local->hw.wiphy->bands[band];
1596 if (!sband)
1597 continue;
1598
1599 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1600 }
1601
1602 if (!supp_vht)
1603 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1604
1605 codel_params_init(params: &local->cparams);
1606 local->cparams.interval = MS2TIME(100);
1607 local->cparams.target = MS2TIME(20);
1608 local->cparams.ecn = true;
1609
1610 local->cvars = kvcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1611 GFP_KERNEL);
1612 if (!local->cvars) {
1613 spin_lock_bh(lock: &fq->lock);
1614 fq_reset(fq, free_func: fq_skb_free_func);
1615 spin_unlock_bh(lock: &fq->lock);
1616 return -ENOMEM;
1617 }
1618
1619 for (i = 0; i < fq->flows_cnt; i++)
1620 codel_vars_init(vars: &local->cvars[i]);
1621
1622 ieee80211_txq_set_params(local, radio_idx: -1);
1623
1624 return 0;
1625}
1626
1627void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1628{
1629 struct fq *fq = &local->fq;
1630
1631 kvfree(addr: local->cvars);
1632 local->cvars = NULL;
1633
1634 spin_lock_bh(lock: &fq->lock);
1635 fq_reset(fq, free_func: fq_skb_free_func);
1636 spin_unlock_bh(lock: &fq->lock);
1637}
1638
1639static bool ieee80211_queue_skb(struct ieee80211_local *local,
1640 struct ieee80211_sub_if_data *sdata,
1641 struct sta_info *sta,
1642 struct sk_buff *skb)
1643{
1644 struct ieee80211_vif *vif;
1645 struct txq_info *txqi;
1646
1647 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1648 return false;
1649
1650 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1651 sdata = container_of(sdata->bss,
1652 struct ieee80211_sub_if_data, u.ap);
1653
1654 vif = &sdata->vif;
1655 txqi = ieee80211_get_txq(local, vif, sta, skb);
1656
1657 if (!txqi)
1658 return false;
1659
1660 ieee80211_txq_enqueue(local, txqi, skb);
1661
1662 schedule_and_wake_txq(local, txqi);
1663
1664 return true;
1665}
1666
1667static bool ieee80211_tx_frags(struct ieee80211_local *local,
1668 struct ieee80211_vif *vif,
1669 struct sta_info *sta,
1670 struct sk_buff_head *skbs,
1671 bool txpending)
1672{
1673 struct ieee80211_tx_control control = {};
1674 struct sk_buff *skb, *tmp;
1675 unsigned long flags;
1676
1677 skb_queue_walk_safe(skbs, skb, tmp) {
1678 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1679 int q = info->hw_queue;
1680
1681#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1682 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1683 __skb_unlink(skb, skbs);
1684 ieee80211_free_txskb(&local->hw, skb);
1685 continue;
1686 }
1687#endif
1688
1689 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1690 if (local->queue_stop_reasons[q] ||
1691 (!txpending && !skb_queue_empty(list: &local->pending[q]))) {
1692 if (unlikely(info->flags &
1693 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1694 if (local->queue_stop_reasons[q] &
1695 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1696 /*
1697 * Drop off-channel frames if queues
1698 * are stopped for any reason other
1699 * than off-channel operation. Never
1700 * queue them.
1701 */
1702 spin_unlock_irqrestore(
1703 lock: &local->queue_stop_reason_lock,
1704 flags);
1705 ieee80211_purge_tx_queue(hw: &local->hw,
1706 skbs);
1707 return true;
1708 }
1709 } else {
1710
1711 /*
1712 * Since queue is stopped, queue up frames for
1713 * later transmission from the tx-pending
1714 * tasklet when the queue is woken again.
1715 */
1716 if (txpending)
1717 skb_queue_splice_init(list: skbs,
1718 head: &local->pending[q]);
1719 else
1720 skb_queue_splice_tail_init(list: skbs,
1721 head: &local->pending[q]);
1722
1723 spin_unlock_irqrestore(lock: &local->queue_stop_reason_lock,
1724 flags);
1725 return false;
1726 }
1727 }
1728 spin_unlock_irqrestore(lock: &local->queue_stop_reason_lock, flags);
1729
1730 info->control.vif = vif;
1731 control.sta = sta ? &sta->sta : NULL;
1732
1733 __skb_unlink(skb, list: skbs);
1734 drv_tx(local, control: &control, skb);
1735 }
1736
1737 return true;
1738}
1739
1740/*
1741 * Returns false if the frame couldn't be transmitted but was queued instead.
1742 */
1743static bool __ieee80211_tx(struct ieee80211_local *local,
1744 struct sk_buff_head *skbs, struct sta_info *sta,
1745 bool txpending)
1746{
1747 struct ieee80211_tx_info *info;
1748 struct ieee80211_sub_if_data *sdata;
1749 struct ieee80211_vif *vif;
1750 struct sk_buff *skb;
1751 bool result;
1752
1753 if (WARN_ON(skb_queue_empty(skbs)))
1754 return true;
1755
1756 skb = skb_peek(list_: skbs);
1757 info = IEEE80211_SKB_CB(skb);
1758 sdata = vif_to_sdata(p: info->control.vif);
1759 if (sta && !sta->uploaded)
1760 sta = NULL;
1761
1762 switch (sdata->vif.type) {
1763 case NL80211_IFTYPE_MONITOR:
1764 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) ||
1765 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) {
1766 vif = &sdata->vif;
1767 break;
1768 }
1769 sdata = rcu_dereference(local->monitor_sdata);
1770 if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) {
1771 vif = &sdata->vif;
1772 info->hw_queue =
1773 vif->hw_queue[skb_get_queue_mapping(skb)];
1774 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1775 ieee80211_purge_tx_queue(hw: &local->hw, skbs);
1776 return true;
1777 } else
1778 vif = NULL;
1779 break;
1780 case NL80211_IFTYPE_AP_VLAN:
1781 sdata = container_of(sdata->bss,
1782 struct ieee80211_sub_if_data, u.ap);
1783 fallthrough;
1784 default:
1785 vif = &sdata->vif;
1786 break;
1787 }
1788
1789 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending);
1790
1791 WARN_ON_ONCE(!skb_queue_empty(skbs));
1792
1793 return result;
1794}
1795
1796/*
1797 * Invoke TX handlers, return 0 on success and non-zero if the
1798 * frame was dropped or queued.
1799 *
1800 * The handlers are split into an early and late part. The latter is everything
1801 * that can be sensitive to reordering, and will be deferred to after packets
1802 * are dequeued from the intermediate queues (when they are enabled).
1803 */
1804static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1805{
1806 ieee80211_tx_result res = TX_DROP;
1807
1808#define CALL_TXH(txh) \
1809 do { \
1810 res = txh(tx); \
1811 if (res != TX_CONTINUE) \
1812 goto txh_done; \
1813 } while (0)
1814
1815 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1816 CALL_TXH(ieee80211_tx_h_check_assoc);
1817 CALL_TXH(ieee80211_tx_h_ps_buf);
1818 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1819 CALL_TXH(ieee80211_tx_h_select_key);
1820
1821 txh_done:
1822 if (unlikely(res == TX_DROP)) {
1823 tx->sdata->tx_handlers_drop++;
1824 if (tx->skb)
1825 ieee80211_free_txskb(hw: &tx->local->hw, skb: tx->skb);
1826 else
1827 ieee80211_purge_tx_queue(hw: &tx->local->hw, skbs: &tx->skbs);
1828 return -1;
1829 } else if (unlikely(res == TX_QUEUED)) {
1830 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1831 return -1;
1832 }
1833
1834 return 0;
1835}
1836
1837/*
1838 * Late handlers can be called while the sta lock is held. Handlers that can
1839 * cause packets to be generated will cause deadlock!
1840 */
1841static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1842{
1843 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb: tx->skb);
1844 ieee80211_tx_result res = TX_CONTINUE;
1845
1846 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1847 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1848
1849 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1850 __skb_queue_tail(list: &tx->skbs, newsk: tx->skb);
1851 tx->skb = NULL;
1852 goto txh_done;
1853 }
1854
1855 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1856 CALL_TXH(ieee80211_tx_h_sequence);
1857 CALL_TXH(ieee80211_tx_h_fragment);
1858 /* handlers after fragment must be aware of tx info fragmentation! */
1859 CALL_TXH(ieee80211_tx_h_stats);
1860 CALL_TXH(ieee80211_tx_h_encrypt);
1861 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1862 CALL_TXH(ieee80211_tx_h_calculate_duration);
1863#undef CALL_TXH
1864
1865 txh_done:
1866 if (unlikely(res == TX_DROP)) {
1867 tx->sdata->tx_handlers_drop++;
1868 if (tx->skb)
1869 ieee80211_free_txskb(hw: &tx->local->hw, skb: tx->skb);
1870 else
1871 ieee80211_purge_tx_queue(hw: &tx->local->hw, skbs: &tx->skbs);
1872 return -1;
1873 } else if (unlikely(res == TX_QUEUED)) {
1874 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1875 return -1;
1876 }
1877
1878 return 0;
1879}
1880
1881static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1882{
1883 int r = invoke_tx_handlers_early(tx);
1884
1885 if (r)
1886 return r;
1887 return invoke_tx_handlers_late(tx);
1888}
1889
1890bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1891 struct ieee80211_vif *vif, struct sk_buff *skb,
1892 int band, struct ieee80211_sta **sta)
1893{
1894 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
1895 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1896 struct ieee80211_tx_data tx;
1897 struct sk_buff *skb2;
1898
1899 if (ieee80211_tx_prepare(sdata, tx: &tx, NULL, skb) == TX_DROP)
1900 return false;
1901
1902 info->band = band;
1903 info->control.vif = vif;
1904 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1905
1906 if (invoke_tx_handlers(tx: &tx))
1907 return false;
1908
1909 if (sta) {
1910 if (tx.sta)
1911 *sta = &tx.sta->sta;
1912 else
1913 *sta = NULL;
1914 }
1915
1916 /* this function isn't suitable for fragmented data frames */
1917 skb2 = __skb_dequeue(list: &tx.skbs);
1918 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1919 ieee80211_free_txskb(hw, skb: skb2);
1920 ieee80211_purge_tx_queue(hw, skbs: &tx.skbs);
1921 return false;
1922 }
1923
1924 return true;
1925}
1926EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1927
1928/*
1929 * Returns false if the frame couldn't be transmitted but was queued instead.
1930 */
1931static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1932 struct sta_info *sta, struct sk_buff *skb,
1933 bool txpending)
1934{
1935 struct ieee80211_local *local = sdata->local;
1936 struct ieee80211_tx_data tx;
1937 ieee80211_tx_result res_prepare;
1938 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1939 bool result = true;
1940
1941 if (unlikely(skb->len < 10)) {
1942 dev_kfree_skb(skb);
1943 return true;
1944 }
1945
1946 /* initialises tx */
1947 res_prepare = ieee80211_tx_prepare(sdata, tx: &tx, sta, skb);
1948
1949 if (unlikely(res_prepare == TX_DROP)) {
1950 ieee80211_free_txskb(hw: &local->hw, skb);
1951 tx.sdata->tx_handlers_drop++;
1952 return true;
1953 } else if (unlikely(res_prepare == TX_QUEUED)) {
1954 return true;
1955 }
1956
1957 /* set up hw_queue value early */
1958 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1959 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1960 info->hw_queue =
1961 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1962
1963 if (invoke_tx_handlers_early(tx: &tx))
1964 return true;
1965
1966 if (ieee80211_queue_skb(local, sdata, sta: tx.sta, skb: tx.skb))
1967 return true;
1968
1969 if (!invoke_tx_handlers_late(tx: &tx))
1970 result = __ieee80211_tx(local, skbs: &tx.skbs, sta: tx.sta, txpending);
1971
1972 return result;
1973}
1974
1975/* device xmit handlers */
1976
1977enum ieee80211_encrypt {
1978 ENCRYPT_NO,
1979 ENCRYPT_MGMT,
1980 ENCRYPT_DATA,
1981};
1982
1983static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1984 struct sk_buff *skb,
1985 int head_need,
1986 enum ieee80211_encrypt encrypt)
1987{
1988 struct ieee80211_local *local = sdata->local;
1989 bool enc_tailroom;
1990 int tail_need = 0;
1991
1992 enc_tailroom = encrypt == ENCRYPT_MGMT ||
1993 (encrypt == ENCRYPT_DATA &&
1994 sdata->crypto_tx_tailroom_needed_cnt);
1995
1996 if (enc_tailroom) {
1997 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1998 tail_need -= skb_tailroom(skb);
1999 tail_need = max_t(int, tail_need, 0);
2000 }
2001
2002 if (skb_cloned(skb) &&
2003 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
2004 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
2005 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
2006 else if (head_need || tail_need)
2007 I802_DEBUG_INC(local->tx_expand_skb_head);
2008 else
2009 return 0;
2010
2011 if (pskb_expand_head(skb, nhead: head_need, ntail: tail_need, GFP_ATOMIC)) {
2012 wiphy_debug(local->hw.wiphy,
2013 "failed to reallocate TX buffer\n");
2014 return -ENOMEM;
2015 }
2016
2017 return 0;
2018}
2019
2020void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
2021 struct sta_info *sta, struct sk_buff *skb)
2022{
2023 struct ieee80211_local *local = sdata->local;
2024 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2025 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2026 int headroom;
2027 enum ieee80211_encrypt encrypt;
2028
2029 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)
2030 encrypt = ENCRYPT_NO;
2031 else if (ieee80211_is_mgmt(fc: hdr->frame_control))
2032 encrypt = ENCRYPT_MGMT;
2033 else
2034 encrypt = ENCRYPT_DATA;
2035
2036 headroom = local->tx_headroom;
2037 if (encrypt != ENCRYPT_NO)
2038 headroom += IEEE80211_ENCRYPT_HEADROOM;
2039 headroom -= skb_headroom(skb);
2040 headroom = max_t(int, 0, headroom);
2041
2042 if (ieee80211_skb_resize(sdata, skb, head_need: headroom, encrypt)) {
2043 ieee80211_free_txskb(hw: &local->hw, skb);
2044 return;
2045 }
2046
2047 /* reload after potential resize */
2048 hdr = (struct ieee80211_hdr *) skb->data;
2049 info->control.vif = &sdata->vif;
2050
2051 if (ieee80211_vif_is_mesh(vif: &sdata->vif)) {
2052 if (ieee80211_is_data(fc: hdr->frame_control) &&
2053 is_unicast_ether_addr(addr: hdr->addr1)) {
2054 if (mesh_nexthop_resolve(sdata, skb))
2055 return; /* skb queued: don't free */
2056 } else {
2057 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2058 }
2059 }
2060
2061 ieee80211_set_qos_hdr(sdata, skb);
2062 ieee80211_tx(sdata, sta, skb, txpending: false);
2063}
2064
2065static bool ieee80211_validate_radiotap_len(struct sk_buff *skb)
2066{
2067 struct ieee80211_radiotap_header *rthdr =
2068 (struct ieee80211_radiotap_header *)skb->data;
2069
2070 /* check for not even having the fixed radiotap header part */
2071 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2072 return false; /* too short to be possibly valid */
2073
2074 /* is it a header version we can trust to find length from? */
2075 if (unlikely(rthdr->it_version))
2076 return false; /* only version 0 is supported */
2077
2078 /* does the skb contain enough to deliver on the alleged length? */
2079 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data)))
2080 return false; /* skb too short for claimed rt header extent */
2081
2082 return true;
2083}
2084
2085bool ieee80211_parse_tx_radiotap(struct sk_buff *skb,
2086 struct net_device *dev)
2087{
2088 struct ieee80211_local *local = wdev_priv(wdev: dev->ieee80211_ptr);
2089 struct ieee80211_radiotap_iterator iterator;
2090 struct ieee80211_radiotap_header *rthdr =
2091 (struct ieee80211_radiotap_header *) skb->data;
2092 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2093 int ret = ieee80211_radiotap_iterator_init(iterator: &iterator, radiotap_header: rthdr, max_length: skb->len,
2094 NULL);
2095 u16 txflags;
2096 u16 rate = 0;
2097 bool rate_found = false;
2098 u8 rate_retries = 0;
2099 u16 rate_flags = 0;
2100 u8 mcs_known, mcs_flags, mcs_bw;
2101 u16 vht_known;
2102 u8 vht_mcs = 0, vht_nss = 0;
2103 int i;
2104
2105 if (!ieee80211_validate_radiotap_len(skb))
2106 return false;
2107
2108 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2109 IEEE80211_TX_CTL_DONTFRAG;
2110
2111 /*
2112 * for every radiotap entry that is present
2113 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2114 * entries present, or -EINVAL on error)
2115 */
2116
2117 while (!ret) {
2118 ret = ieee80211_radiotap_iterator_next(iterator: &iterator);
2119
2120 if (ret)
2121 continue;
2122
2123 /* see if this argument is something we can use */
2124 switch (iterator.this_arg_index) {
2125 /*
2126 * You must take care when dereferencing iterator.this_arg
2127 * for multibyte types... the pointer is not aligned. Use
2128 * get_unaligned((type *)iterator.this_arg) to dereference
2129 * iterator.this_arg for type "type" safely on all arches.
2130 */
2131 case IEEE80211_RADIOTAP_FLAGS:
2132 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2133 /*
2134 * this indicates that the skb we have been
2135 * handed has the 32-bit FCS CRC at the end...
2136 * we should react to that by snipping it off
2137 * because it will be recomputed and added
2138 * on transmission
2139 */
2140 if (skb->len < (iterator._max_length + FCS_LEN))
2141 return false;
2142
2143 skb_trim(skb, len: skb->len - FCS_LEN);
2144 }
2145 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2146 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2147 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2148 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2149 break;
2150
2151 case IEEE80211_RADIOTAP_TX_FLAGS:
2152 txflags = get_unaligned_le16(p: iterator.this_arg);
2153 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2154 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2155 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO)
2156 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
2157 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER)
2158 info->control.flags |=
2159 IEEE80211_TX_CTRL_DONT_REORDER;
2160 break;
2161
2162 case IEEE80211_RADIOTAP_RATE:
2163 rate = *iterator.this_arg;
2164 rate_flags = 0;
2165 rate_found = true;
2166 break;
2167
2168 case IEEE80211_RADIOTAP_ANTENNA:
2169 /* this can appear multiple times, keep a bitmap */
2170 info->control.antennas |= BIT(*iterator.this_arg);
2171 break;
2172
2173 case IEEE80211_RADIOTAP_DATA_RETRIES:
2174 rate_retries = *iterator.this_arg;
2175 break;
2176
2177 case IEEE80211_RADIOTAP_MCS:
2178 mcs_known = iterator.this_arg[0];
2179 mcs_flags = iterator.this_arg[1];
2180 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2181 break;
2182
2183 rate_found = true;
2184 rate = iterator.this_arg[2];
2185 rate_flags = IEEE80211_TX_RC_MCS;
2186
2187 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2188 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2189 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2190
2191 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2192 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2193 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2194 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2195
2196 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC &&
2197 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC)
2198 info->flags |= IEEE80211_TX_CTL_LDPC;
2199
2200 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) {
2201 u8 stbc = u8_get_bits(v: mcs_flags,
2202 field: IEEE80211_RADIOTAP_MCS_STBC_MASK);
2203
2204 info->flags |=
2205 u32_encode_bits(v: stbc,
2206 field: IEEE80211_TX_CTL_STBC);
2207 }
2208 break;
2209
2210 case IEEE80211_RADIOTAP_VHT:
2211 vht_known = get_unaligned_le16(p: iterator.this_arg);
2212 rate_found = true;
2213
2214 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2215 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2216 (iterator.this_arg[2] &
2217 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2218 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2219 if (vht_known &
2220 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2221 if (iterator.this_arg[3] == 1)
2222 rate_flags |=
2223 IEEE80211_TX_RC_40_MHZ_WIDTH;
2224 else if (iterator.this_arg[3] == 4)
2225 rate_flags |=
2226 IEEE80211_TX_RC_80_MHZ_WIDTH;
2227 else if (iterator.this_arg[3] == 11)
2228 rate_flags |=
2229 IEEE80211_TX_RC_160_MHZ_WIDTH;
2230 }
2231
2232 vht_mcs = iterator.this_arg[4] >> 4;
2233 if (vht_mcs > 11)
2234 vht_mcs = 0;
2235 vht_nss = iterator.this_arg[4] & 0xF;
2236 if (!vht_nss || vht_nss > 8)
2237 vht_nss = 1;
2238 break;
2239
2240 /*
2241 * Please update the file
2242 * Documentation/networking/mac80211-injection.rst
2243 * when parsing new fields here.
2244 */
2245
2246 default:
2247 break;
2248 }
2249 }
2250
2251 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2252 return false;
2253
2254 if (rate_found) {
2255 struct ieee80211_supported_band *sband =
2256 local->hw.wiphy->bands[info->band];
2257
2258 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2259
2260 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2261 info->control.rates[i].idx = -1;
2262 info->control.rates[i].flags = 0;
2263 info->control.rates[i].count = 0;
2264 }
2265
2266 if (rate_flags & IEEE80211_TX_RC_MCS) {
2267 /* reset antennas if not enough */
2268 if (IEEE80211_HT_MCS_CHAINS(rate) >
2269 hweight8(info->control.antennas))
2270 info->control.antennas = 0;
2271
2272 info->control.rates[0].idx = rate;
2273 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2274 /* reset antennas if not enough */
2275 if (vht_nss > hweight8(info->control.antennas))
2276 info->control.antennas = 0;
2277
2278 ieee80211_rate_set_vht(rate: info->control.rates, mcs: vht_mcs,
2279 nss: vht_nss);
2280 } else if (sband) {
2281 for (i = 0; i < sband->n_bitrates; i++) {
2282 if (rate * 5 != sband->bitrates[i].bitrate)
2283 continue;
2284
2285 info->control.rates[0].idx = i;
2286 break;
2287 }
2288 }
2289
2290 if (info->control.rates[0].idx < 0)
2291 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2292
2293 info->control.rates[0].flags = rate_flags;
2294 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2295 local->hw.max_rate_tries);
2296 }
2297
2298 return true;
2299}
2300
2301netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2302 struct net_device *dev)
2303{
2304 struct ieee80211_local *local = wdev_priv(wdev: dev->ieee80211_ptr);
2305 struct ieee80211_chanctx_conf *chanctx_conf;
2306 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2307 struct ieee80211_hdr *hdr;
2308 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2309 struct cfg80211_chan_def *chandef;
2310 u16 len_rthdr;
2311 int hdrlen;
2312
2313 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2314 if (unlikely(!ieee80211_sdata_running(sdata)))
2315 goto fail;
2316
2317 memset(s: info, c: 0, n: sizeof(*info));
2318 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2319 IEEE80211_TX_CTL_INJECTED;
2320
2321 /* Sanity-check the length of the radiotap header */
2322 if (!ieee80211_validate_radiotap_len(skb))
2323 goto fail;
2324
2325 /* we now know there is a radiotap header with a length we can use */
2326 len_rthdr = ieee80211_get_radiotap_len(data: skb->data);
2327
2328 /*
2329 * fix up the pointers accounting for the radiotap
2330 * header still being in there. We are being given
2331 * a precooked IEEE80211 header so no need for
2332 * normal processing
2333 */
2334 skb_set_mac_header(skb, offset: len_rthdr);
2335 /*
2336 * these are just fixed to the end of the rt area since we
2337 * don't have any better information and at this point, nobody cares
2338 */
2339 skb_set_network_header(skb, offset: len_rthdr);
2340 skb_set_transport_header(skb, offset: len_rthdr);
2341
2342 if (skb->len < len_rthdr + 2)
2343 goto fail;
2344
2345 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2346 hdrlen = ieee80211_hdrlen(fc: hdr->frame_control);
2347
2348 if (skb->len < len_rthdr + hdrlen)
2349 goto fail;
2350
2351 /*
2352 * Initialize skb->protocol if the injected frame is a data frame
2353 * carrying a rfc1042 header
2354 */
2355 if (ieee80211_is_data(fc: hdr->frame_control) &&
2356 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2357 u8 *payload = (u8 *)hdr + hdrlen;
2358
2359 if (ether_addr_equal(addr1: payload, addr2: rfc1042_header))
2360 skb->protocol = cpu_to_be16((payload[6] << 8) |
2361 payload[7]);
2362 }
2363
2364 rcu_read_lock();
2365
2366 /*
2367 * We process outgoing injected frames that have a local address
2368 * we handle as though they are non-injected frames.
2369 * This code here isn't entirely correct, the local MAC address
2370 * isn't always enough to find the interface to use; for proper
2371 * VLAN support we have an nl80211-based mechanism.
2372 *
2373 * This is necessary, for example, for old hostapd versions that
2374 * don't use nl80211-based management TX/RX.
2375 */
2376 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2377 if (!ieee80211_sdata_running(sdata: tmp_sdata))
2378 continue;
2379 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2380 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2381 continue;
2382 if (ether_addr_equal(addr1: tmp_sdata->vif.addr, addr2: hdr->addr2)) {
2383 sdata = tmp_sdata;
2384 break;
2385 }
2386 }
2387
2388 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2389 if (!chanctx_conf) {
2390 tmp_sdata = rcu_dereference(local->monitor_sdata);
2391 if (tmp_sdata)
2392 chanctx_conf =
2393 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf);
2394 }
2395
2396 if (chanctx_conf)
2397 chandef = &chanctx_conf->def;
2398 else
2399 goto fail_rcu;
2400
2401 /*
2402 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still
2403 * shouldn't transmit on disabled channels.
2404 */
2405 if (!cfg80211_chandef_usable(wiphy: local->hw.wiphy, chandef,
2406 prohibited_flags: IEEE80211_CHAN_DISABLED))
2407 goto fail_rcu;
2408
2409 /*
2410 * Frame injection is not allowed if beaconing is not allowed
2411 * or if we need radar detection. Beaconing is usually not allowed when
2412 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2413 * Passive scan is also used in world regulatory domains where
2414 * your country is not known and as such it should be treated as
2415 * NO TX unless the channel is explicitly allowed in which case
2416 * your current regulatory domain would not have the passive scan
2417 * flag.
2418 *
2419 * Since AP mode uses monitor interfaces to inject/TX management
2420 * frames we can make AP mode the exception to this rule once it
2421 * supports radar detection as its implementation can deal with
2422 * radar detection by itself. We can do that later by adding a
2423 * monitor flag interfaces used for AP support.
2424 */
2425 if (!cfg80211_reg_can_beacon(wiphy: local->hw.wiphy, chandef,
2426 iftype: sdata->vif.type))
2427 goto fail_rcu;
2428
2429 info->band = chandef->chan->band;
2430
2431 /* Initialize skb->priority according to frame type and TID class,
2432 * with respect to the sub interface that the frame will actually
2433 * be transmitted on. If the DONT_REORDER flag is set, the original
2434 * skb-priority is preserved to assure frames injected with this
2435 * flag are not reordered relative to each other.
2436 */
2437 ieee80211_select_queue_80211(sdata, skb, hdr);
2438 skb_set_queue_mapping(skb, queue_mapping: ieee80211_ac_from_tid(tid: skb->priority));
2439
2440 /*
2441 * Process the radiotap header. This will now take into account the
2442 * selected chandef above to accurately set injection rates and
2443 * retransmissions.
2444 */
2445 if (!ieee80211_parse_tx_radiotap(skb, dev))
2446 goto fail_rcu;
2447
2448 /* remove the injection radiotap header */
2449 skb_pull(skb, len: len_rthdr);
2450
2451 ieee80211_xmit(sdata, NULL, skb);
2452 rcu_read_unlock();
2453
2454 return NETDEV_TX_OK;
2455
2456fail_rcu:
2457 rcu_read_unlock();
2458fail:
2459 dev_kfree_skb(skb);
2460 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2461}
2462
2463static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2464{
2465 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2466
2467 return ethertype == ETH_P_TDLS &&
2468 skb->len > 14 &&
2469 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2470}
2471
2472int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2473 struct sk_buff *skb,
2474 struct sta_info **sta_out)
2475{
2476 struct sta_info *sta;
2477
2478 switch (sdata->vif.type) {
2479 case NL80211_IFTYPE_AP_VLAN:
2480 sta = rcu_dereference(sdata->u.vlan.sta);
2481 if (sta) {
2482 *sta_out = sta;
2483 return 0;
2484 } else if (sdata->wdev.use_4addr) {
2485 return -ENOLINK;
2486 }
2487 fallthrough;
2488 case NL80211_IFTYPE_AP:
2489 case NL80211_IFTYPE_OCB:
2490 case NL80211_IFTYPE_ADHOC:
2491 if (is_multicast_ether_addr(addr: skb->data)) {
2492 *sta_out = ERR_PTR(error: -ENOENT);
2493 return 0;
2494 }
2495 sta = sta_info_get_bss(sdata, addr: skb->data);
2496 break;
2497#ifdef CONFIG_MAC80211_MESH
2498 case NL80211_IFTYPE_MESH_POINT:
2499 /* determined much later */
2500 *sta_out = NULL;
2501 return 0;
2502#endif
2503 case NL80211_IFTYPE_STATION:
2504 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2505 sta = sta_info_get(sdata, addr: skb->data);
2506 if (sta && test_sta_flag(sta, flag: WLAN_STA_TDLS_PEER)) {
2507 if (test_sta_flag(sta,
2508 flag: WLAN_STA_TDLS_PEER_AUTH)) {
2509 *sta_out = sta;
2510 return 0;
2511 }
2512
2513 /*
2514 * TDLS link during setup - throw out frames to
2515 * peer. Allow TDLS-setup frames to unauthorized
2516 * peers for the special case of a link teardown
2517 * after a TDLS sta is removed due to being
2518 * unreachable.
2519 */
2520 if (!ieee80211_is_tdls_setup(skb))
2521 return -EINVAL;
2522 }
2523
2524 }
2525
2526 sta = sta_info_get(sdata, addr: sdata->vif.cfg.ap_addr);
2527 if (!sta)
2528 return -ENOLINK;
2529 break;
2530 default:
2531 return -EINVAL;
2532 }
2533
2534 *sta_out = sta ?: ERR_PTR(error: -ENOENT);
2535 return 0;
2536}
2537
2538static u16 ieee80211_store_ack_skb(struct ieee80211_local *local,
2539 struct sk_buff *skb,
2540 u32 *info_flags,
2541 u64 *cookie)
2542{
2543 struct sk_buff *ack_skb;
2544 u16 info_id = 0;
2545
2546 if (skb->sk)
2547 ack_skb = skb_clone_sk(skb);
2548 else
2549 ack_skb = skb_clone(skb, GFP_ATOMIC);
2550
2551 if (ack_skb) {
2552 unsigned long flags;
2553 int id;
2554
2555 spin_lock_irqsave(&local->ack_status_lock, flags);
2556 id = idr_alloc(&local->ack_status_frames, ptr: ack_skb,
2557 start: 1, end: 0x2000, GFP_ATOMIC);
2558 spin_unlock_irqrestore(lock: &local->ack_status_lock, flags);
2559
2560 if (id >= 0) {
2561 info_id = id;
2562 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2563 if (cookie) {
2564 *cookie = ieee80211_mgmt_tx_cookie(local);
2565 IEEE80211_SKB_CB(skb: ack_skb)->ack.cookie = *cookie;
2566 }
2567 } else {
2568 kfree_skb(skb: ack_skb);
2569 }
2570 }
2571
2572 return info_id;
2573}
2574
2575/**
2576 * ieee80211_build_hdr - build 802.11 header in the given frame
2577 * @sdata: virtual interface to build the header for
2578 * @skb: the skb to build the header in
2579 * @info_flags: skb flags to set
2580 * @sta: the station pointer
2581 * @ctrl_flags: info control flags to set
2582 * @cookie: cookie pointer to fill (if not %NULL)
2583 *
2584 * This function takes the skb with 802.3 header and reformats the header to
2585 * the appropriate IEEE 802.11 header based on which interface the packet is
2586 * being transmitted on.
2587 *
2588 * Note that this function also takes care of the TX status request and
2589 * potential unsharing of the SKB - this needs to be interleaved with the
2590 * header building.
2591 *
2592 * The function requires the read-side RCU lock held
2593 *
2594 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2595 */
2596static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2597 struct sk_buff *skb, u32 info_flags,
2598 struct sta_info *sta, u32 ctrl_flags,
2599 u64 *cookie)
2600{
2601 struct ieee80211_local *local = sdata->local;
2602 struct ieee80211_tx_info *info;
2603 int head_need;
2604 u16 ethertype, hdrlen, meshhdrlen = 0;
2605 __le16 fc;
2606 struct ieee80211_hdr hdr;
2607 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2608 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2609 const u8 *encaps_data;
2610 int encaps_len, skip_header_bytes;
2611 bool wme_sta = false, authorized = false;
2612 bool tdls_peer;
2613 bool multicast;
2614 u16 info_id = 0;
2615 struct ieee80211_chanctx_conf *chanctx_conf = NULL;
2616 enum nl80211_band band;
2617 int ret;
2618 u8 link_id = u32_get_bits(v: ctrl_flags, field: IEEE80211_TX_CTRL_MLO_LINK);
2619
2620 if (IS_ERR(ptr: sta))
2621 sta = NULL;
2622
2623#ifdef CONFIG_MAC80211_DEBUGFS
2624 if (local->force_tx_status)
2625 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2626#endif
2627
2628 /* convert Ethernet header to proper 802.11 header (based on
2629 * operation mode) */
2630 ethertype = (skb->data[12] << 8) | skb->data[13];
2631 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2632
2633 if (!ieee80211_vif_is_mld(vif: &sdata->vif))
2634 chanctx_conf =
2635 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2636
2637 switch (sdata->vif.type) {
2638 case NL80211_IFTYPE_AP_VLAN:
2639 if (sdata->wdev.use_4addr) {
2640 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2641 /* RA TA DA SA */
2642 memcpy(to: hdr.addr1, from: sta->sta.addr, ETH_ALEN);
2643 memcpy(to: hdr.addr2, from: sdata->vif.addr, ETH_ALEN);
2644 memcpy(to: hdr.addr3, from: skb->data, ETH_ALEN);
2645 memcpy(to: hdr.addr4, from: skb->data + ETH_ALEN, ETH_ALEN);
2646 hdrlen = 30;
2647 authorized = test_sta_flag(sta, flag: WLAN_STA_AUTHORIZED);
2648 wme_sta = sta->sta.wme;
2649 }
2650 if (!ieee80211_vif_is_mld(vif: &sdata->vif)) {
2651 struct ieee80211_sub_if_data *ap_sdata;
2652
2653 /* override chanctx_conf from AP (we don't have one) */
2654 ap_sdata = container_of(sdata->bss,
2655 struct ieee80211_sub_if_data,
2656 u.ap);
2657 chanctx_conf =
2658 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf);
2659 }
2660 if (sdata->wdev.use_4addr)
2661 break;
2662 fallthrough;
2663 case NL80211_IFTYPE_AP:
2664 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2665 /* DA BSSID SA */
2666 memcpy(to: hdr.addr1, from: skb->data, ETH_ALEN);
2667
2668 if (ieee80211_vif_is_mld(vif: &sdata->vif) && sta && !sta->sta.mlo) {
2669 struct ieee80211_link_data *link;
2670
2671 link_id = sta->deflink.link_id;
2672 link = rcu_dereference(sdata->link[link_id]);
2673 if (WARN_ON(!link)) {
2674 ret = -ENOLINK;
2675 goto free;
2676 }
2677 memcpy(to: hdr.addr2, from: link->conf->addr, ETH_ALEN);
2678 } else if (link_id == IEEE80211_LINK_UNSPECIFIED ||
2679 (sta && sta->sta.mlo)) {
2680 memcpy(to: hdr.addr2, from: sdata->vif.addr, ETH_ALEN);
2681 } else {
2682 struct ieee80211_bss_conf *conf;
2683
2684 conf = rcu_dereference(sdata->vif.link_conf[link_id]);
2685 if (unlikely(!conf)) {
2686 ret = -ENOLINK;
2687 goto free;
2688 }
2689
2690 memcpy(to: hdr.addr2, from: conf->addr, ETH_ALEN);
2691 }
2692
2693 memcpy(to: hdr.addr3, from: skb->data + ETH_ALEN, ETH_ALEN);
2694 hdrlen = 24;
2695 break;
2696#ifdef CONFIG_MAC80211_MESH
2697 case NL80211_IFTYPE_MESH_POINT:
2698 if (!is_multicast_ether_addr(skb->data)) {
2699 struct sta_info *next_hop;
2700 bool mpp_lookup = true;
2701
2702 mpath = mesh_path_lookup(sdata, skb->data);
2703 if (mpath) {
2704 mpp_lookup = false;
2705 next_hop = rcu_dereference(mpath->next_hop);
2706 if (!next_hop ||
2707 !(mpath->flags & (MESH_PATH_ACTIVE |
2708 MESH_PATH_RESOLVING)))
2709 mpp_lookup = true;
2710 }
2711
2712 if (mpp_lookup) {
2713 mppath = mpp_path_lookup(sdata, skb->data);
2714 if (mppath)
2715 mppath->exp_time = jiffies;
2716 }
2717
2718 if (mppath && mpath)
2719 mesh_path_del(sdata, mpath->dst);
2720 }
2721
2722 /*
2723 * Use address extension if it is a packet from
2724 * another interface or if we know the destination
2725 * is being proxied by a portal (i.e. portal address
2726 * differs from proxied address)
2727 */
2728 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2729 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2730 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2731 skb->data, skb->data + ETH_ALEN);
2732 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2733 NULL, NULL);
2734 } else {
2735 /* DS -> MBSS (802.11-2012 13.11.3.3).
2736 * For unicast with unknown forwarding information,
2737 * destination might be in the MBSS or if that fails
2738 * forwarded to another mesh gate. In either case
2739 * resolution will be handled in ieee80211_xmit(), so
2740 * leave the original DA. This also works for mcast */
2741 const u8 *mesh_da = skb->data;
2742
2743 if (mppath)
2744 mesh_da = mppath->mpp;
2745 else if (mpath)
2746 mesh_da = mpath->dst;
2747
2748 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2749 mesh_da, sdata->vif.addr);
2750 if (is_multicast_ether_addr(mesh_da))
2751 /* DA TA mSA AE:SA */
2752 meshhdrlen = ieee80211_new_mesh_header(
2753 sdata, &mesh_hdr,
2754 skb->data + ETH_ALEN, NULL);
2755 else
2756 /* RA TA mDA mSA AE:DA SA */
2757 meshhdrlen = ieee80211_new_mesh_header(
2758 sdata, &mesh_hdr, skb->data,
2759 skb->data + ETH_ALEN);
2760
2761 }
2762
2763 /* For injected frames, fill RA right away as nexthop lookup
2764 * will be skipped.
2765 */
2766 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) &&
2767 is_zero_ether_addr(hdr.addr1))
2768 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2769 break;
2770#endif
2771 case NL80211_IFTYPE_STATION:
2772 /* we already did checks when looking up the RA STA */
2773 tdls_peer = test_sta_flag(sta, flag: WLAN_STA_TDLS_PEER);
2774
2775 if (tdls_peer) {
2776 /* For TDLS only one link can be valid with peer STA */
2777 int tdls_link_id = ieee80211_tdls_sta_link_id(sta);
2778 struct ieee80211_link_data *link;
2779
2780 /* DA SA BSSID */
2781 memcpy(to: hdr.addr1, from: skb->data, ETH_ALEN);
2782 memcpy(to: hdr.addr2, from: skb->data + ETH_ALEN, ETH_ALEN);
2783 link = rcu_dereference(sdata->link[tdls_link_id]);
2784 if (WARN_ON_ONCE(!link)) {
2785 ret = -EINVAL;
2786 goto free;
2787 }
2788 memcpy(to: hdr.addr3, from: link->u.mgd.bssid, ETH_ALEN);
2789 hdrlen = 24;
2790 } else if (sdata->u.mgd.use_4addr &&
2791 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2792 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2793 IEEE80211_FCTL_TODS);
2794 /* RA TA DA SA */
2795 memcpy(to: hdr.addr1, from: sdata->deflink.u.mgd.bssid, ETH_ALEN);
2796 memcpy(to: hdr.addr2, from: sdata->vif.addr, ETH_ALEN);
2797 memcpy(to: hdr.addr3, from: skb->data, ETH_ALEN);
2798 memcpy(to: hdr.addr4, from: skb->data + ETH_ALEN, ETH_ALEN);
2799 hdrlen = 30;
2800 } else {
2801 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2802 /* BSSID SA DA */
2803 memcpy(to: hdr.addr1, from: sdata->vif.cfg.ap_addr, ETH_ALEN);
2804 memcpy(to: hdr.addr2, from: skb->data + ETH_ALEN, ETH_ALEN);
2805 memcpy(to: hdr.addr3, from: skb->data, ETH_ALEN);
2806 hdrlen = 24;
2807 }
2808 break;
2809 case NL80211_IFTYPE_OCB:
2810 /* DA SA BSSID */
2811 memcpy(to: hdr.addr1, from: skb->data, ETH_ALEN);
2812 memcpy(to: hdr.addr2, from: skb->data + ETH_ALEN, ETH_ALEN);
2813 eth_broadcast_addr(addr: hdr.addr3);
2814 hdrlen = 24;
2815 break;
2816 case NL80211_IFTYPE_ADHOC:
2817 /* DA SA BSSID */
2818 memcpy(to: hdr.addr1, from: skb->data, ETH_ALEN);
2819 memcpy(to: hdr.addr2, from: skb->data + ETH_ALEN, ETH_ALEN);
2820 memcpy(to: hdr.addr3, from: sdata->u.ibss.bssid, ETH_ALEN);
2821 hdrlen = 24;
2822 break;
2823 default:
2824 ret = -EINVAL;
2825 goto free;
2826 }
2827
2828 if (!chanctx_conf) {
2829 if (!ieee80211_vif_is_mld(vif: &sdata->vif)) {
2830 ret = -ENOTCONN;
2831 goto free;
2832 }
2833 /* MLD transmissions must not rely on the band */
2834 band = 0;
2835 } else {
2836 band = chanctx_conf->def.chan->band;
2837 }
2838
2839 multicast = is_multicast_ether_addr(addr: hdr.addr1);
2840
2841 /* sta is always NULL for mesh */
2842 if (sta) {
2843 authorized = test_sta_flag(sta, flag: WLAN_STA_AUTHORIZED);
2844 wme_sta = sta->sta.wme;
2845 } else if (ieee80211_vif_is_mesh(vif: &sdata->vif)) {
2846 /* For mesh, the use of the QoS header is mandatory */
2847 wme_sta = true;
2848 }
2849
2850 /* receiver does QoS (which also means we do) use it */
2851 if (wme_sta) {
2852 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2853 hdrlen += 2;
2854 }
2855
2856 /*
2857 * Drop unicast frames to unauthorised stations unless they are
2858 * EAPOL frames from the local station.
2859 */
2860 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2861 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2862 !multicast && !authorized &&
2863 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2864 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) {
2865#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2866 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2867 sdata->name, hdr.addr1);
2868#endif
2869
2870 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2871
2872 ret = -EPERM;
2873 goto free;
2874 }
2875
2876 if (unlikely(!multicast &&
2877 (sk_requests_wifi_status(skb->sk) ||
2878 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS)))
2879 info_id = ieee80211_store_ack_skb(local, skb, info_flags: &info_flags,
2880 cookie);
2881
2882 /*
2883 * If the skb is shared we need to obtain our own copy.
2884 */
2885 skb = skb_share_check(skb, GFP_ATOMIC);
2886 if (unlikely(!skb)) {
2887 ret = -ENOMEM;
2888 goto free;
2889 }
2890
2891 hdr.frame_control = fc;
2892 hdr.duration_id = 0;
2893 hdr.seq_ctrl = 0;
2894
2895 skip_header_bytes = ETH_HLEN;
2896 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2897 encaps_data = bridge_tunnel_header;
2898 encaps_len = sizeof(bridge_tunnel_header);
2899 skip_header_bytes -= 2;
2900 } else if (ethertype >= ETH_P_802_3_MIN) {
2901 encaps_data = rfc1042_header;
2902 encaps_len = sizeof(rfc1042_header);
2903 skip_header_bytes -= 2;
2904 } else {
2905 encaps_data = NULL;
2906 encaps_len = 0;
2907 }
2908
2909 skb_pull(skb, len: skip_header_bytes);
2910 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2911
2912 /*
2913 * So we need to modify the skb header and hence need a copy of
2914 * that. The head_need variable above doesn't, so far, include
2915 * the needed header space that we don't need right away. If we
2916 * can, then we don't reallocate right now but only after the
2917 * frame arrives at the master device (if it does...)
2918 *
2919 * If we cannot, however, then we will reallocate to include all
2920 * the ever needed space. Also, if we need to reallocate it anyway,
2921 * make it big enough for everything we may ever need.
2922 */
2923
2924 if (head_need > 0 || skb_cloned(skb)) {
2925 head_need += IEEE80211_ENCRYPT_HEADROOM;
2926 head_need += local->tx_headroom;
2927 head_need = max_t(int, 0, head_need);
2928 if (ieee80211_skb_resize(sdata, skb, head_need, encrypt: ENCRYPT_DATA)) {
2929 ieee80211_free_txskb(hw: &local->hw, skb);
2930 skb = NULL;
2931 return ERR_PTR(error: -ENOMEM);
2932 }
2933 }
2934
2935 if (encaps_data)
2936 memcpy(to: skb_push(skb, len: encaps_len), from: encaps_data, len: encaps_len);
2937
2938#ifdef CONFIG_MAC80211_MESH
2939 if (meshhdrlen > 0)
2940 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2941#endif
2942
2943 if (ieee80211_is_data_qos(fc)) {
2944 __le16 *qos_control;
2945
2946 qos_control = skb_push(skb, len: 2);
2947 memcpy(to: skb_push(skb, len: hdrlen - 2), from: &hdr, len: hdrlen - 2);
2948 /*
2949 * Maybe we could actually set some fields here, for now just
2950 * initialise to zero to indicate no special operation.
2951 */
2952 *qos_control = 0;
2953 } else
2954 memcpy(to: skb_push(skb, len: hdrlen), from: &hdr, len: hdrlen);
2955
2956 skb_reset_mac_header(skb);
2957
2958 info = IEEE80211_SKB_CB(skb);
2959 memset(s: info, c: 0, n: sizeof(*info));
2960
2961 info->flags = info_flags;
2962 if (info_id) {
2963 info->status_data = info_id;
2964 info->status_data_idr = 1;
2965 }
2966 info->band = band;
2967
2968 if (likely(!cookie)) {
2969 ctrl_flags |= u32_encode_bits(v: link_id,
2970 field: IEEE80211_TX_CTRL_MLO_LINK);
2971 } else {
2972 unsigned int pre_conf_link_id;
2973
2974 /*
2975 * ctrl_flags already have been set by
2976 * ieee80211_tx_control_port(), here
2977 * we just sanity check that
2978 */
2979
2980 pre_conf_link_id = u32_get_bits(v: ctrl_flags,
2981 field: IEEE80211_TX_CTRL_MLO_LINK);
2982
2983 if (pre_conf_link_id != link_id &&
2984 link_id != IEEE80211_LINK_UNSPECIFIED) {
2985#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2986 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n",
2987 sdata->name, hdr.addr1,
2988 pre_conf_link_id, link_id);
2989#endif
2990 ret = -EINVAL;
2991 goto free;
2992 }
2993 }
2994
2995 info->control.flags = ctrl_flags;
2996
2997 return skb;
2998 free:
2999 kfree_skb(skb);
3000 return ERR_PTR(error: ret);
3001}
3002
3003/*
3004 * fast-xmit overview
3005 *
3006 * The core idea of this fast-xmit is to remove per-packet checks by checking
3007 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
3008 * checks that are needed to get the sta->fast_tx pointer assigned, after which
3009 * much less work can be done per packet. For example, fragmentation must be
3010 * disabled or the fast_tx pointer will not be set. All the conditions are seen
3011 * in the code here.
3012 *
3013 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
3014 * header and other data to aid packet processing in ieee80211_xmit_fast().
3015 *
3016 * The most difficult part of this is that when any of these assumptions
3017 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
3018 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
3019 * since the per-packet code no longer checks the conditions. This is reflected
3020 * by the calls to these functions throughout the rest of the code, and must be
3021 * maintained if any of the TX path checks change.
3022 */
3023
3024void ieee80211_check_fast_xmit(struct sta_info *sta)
3025{
3026 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
3027 struct ieee80211_local *local = sta->local;
3028 struct ieee80211_sub_if_data *sdata = sta->sdata;
3029 struct ieee80211_hdr *hdr = (void *)build.hdr;
3030 struct ieee80211_chanctx_conf *chanctx_conf;
3031 __le16 fc;
3032
3033 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
3034 return;
3035
3036 if (ieee80211_vif_is_mesh(vif: &sdata->vif))
3037 mesh_fast_tx_flush_sta(sdata, sta);
3038
3039 /* Locking here protects both the pointer itself, and against concurrent
3040 * invocations winning data access races to, e.g., the key pointer that
3041 * is used.
3042 * Without it, the invocation of this function right after the key
3043 * pointer changes wouldn't be sufficient, as another CPU could access
3044 * the pointer, then stall, and then do the cache update after the CPU
3045 * that invalidated the key.
3046 * With the locking, such scenarios cannot happen as the check for the
3047 * key and the fast-tx assignment are done atomically, so the CPU that
3048 * modifies the key will either wait or other one will see the key
3049 * cleared/changed already.
3050 */
3051 spin_lock_bh(lock: &sta->lock);
3052 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3053 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3054 sdata->vif.type == NL80211_IFTYPE_STATION)
3055 goto out;
3056
3057 if (!test_sta_flag(sta, flag: WLAN_STA_AUTHORIZED) || !sta->uploaded)
3058 goto out;
3059
3060 if (test_sta_flag(sta, flag: WLAN_STA_PS_STA) ||
3061 test_sta_flag(sta, flag: WLAN_STA_PS_DRIVER) ||
3062 test_sta_flag(sta, flag: WLAN_STA_PS_DELIVER) ||
3063 test_sta_flag(sta, flag: WLAN_STA_CLEAR_PS_FILT))
3064 goto out;
3065
3066 if (sdata->noack_map)
3067 goto out;
3068
3069 /* fast-xmit doesn't handle fragmentation at all */
3070 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
3071 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
3072 goto out;
3073
3074 if (!ieee80211_vif_is_mld(vif: &sdata->vif)) {
3075 rcu_read_lock();
3076 chanctx_conf =
3077 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
3078 if (!chanctx_conf) {
3079 rcu_read_unlock();
3080 goto out;
3081 }
3082 build.band = chanctx_conf->def.chan->band;
3083 rcu_read_unlock();
3084 } else {
3085 /* MLD transmissions must not rely on the band */
3086 build.band = 0;
3087 }
3088
3089 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
3090
3091 switch (sdata->vif.type) {
3092 case NL80211_IFTYPE_ADHOC:
3093 /* DA SA BSSID */
3094 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3095 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3096 memcpy(to: hdr->addr3, from: sdata->u.ibss.bssid, ETH_ALEN);
3097 build.hdr_len = 24;
3098 break;
3099 case NL80211_IFTYPE_STATION:
3100 if (test_sta_flag(sta, flag: WLAN_STA_TDLS_PEER)) {
3101 /* For TDLS only one link can be valid with peer STA */
3102 int tdls_link_id = ieee80211_tdls_sta_link_id(sta);
3103 struct ieee80211_link_data *link;
3104
3105 /* DA SA BSSID */
3106 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3107 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3108 rcu_read_lock();
3109 link = rcu_dereference(sdata->link[tdls_link_id]);
3110 if (!WARN_ON_ONCE(!link))
3111 memcpy(to: hdr->addr3, from: link->u.mgd.bssid, ETH_ALEN);
3112 rcu_read_unlock();
3113 build.hdr_len = 24;
3114 break;
3115 }
3116
3117 if (sdata->u.mgd.use_4addr) {
3118 /* non-regular ethertype cannot use the fastpath */
3119 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
3120 IEEE80211_FCTL_TODS);
3121 /* RA TA DA SA */
3122 memcpy(to: hdr->addr1, from: sdata->deflink.u.mgd.bssid, ETH_ALEN);
3123 memcpy(to: hdr->addr2, from: sdata->vif.addr, ETH_ALEN);
3124 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3125 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3126 build.hdr_len = 30;
3127 break;
3128 }
3129 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
3130 /* BSSID SA DA */
3131 memcpy(to: hdr->addr1, from: sdata->vif.cfg.ap_addr, ETH_ALEN);
3132 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3133 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3134 build.hdr_len = 24;
3135 break;
3136 case NL80211_IFTYPE_AP_VLAN:
3137 if (sdata->wdev.use_4addr) {
3138 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
3139 IEEE80211_FCTL_TODS);
3140 /* RA TA DA SA */
3141 memcpy(to: hdr->addr1, from: sta->sta.addr, ETH_ALEN);
3142 memcpy(to: hdr->addr2, from: sdata->vif.addr, ETH_ALEN);
3143 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3144 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3145 build.hdr_len = 30;
3146 break;
3147 }
3148 fallthrough;
3149 case NL80211_IFTYPE_AP:
3150 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
3151 /* DA BSSID SA */
3152 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3153 if (sta->sta.mlo || !ieee80211_vif_is_mld(vif: &sdata->vif)) {
3154 memcpy(to: hdr->addr2, from: sdata->vif.addr, ETH_ALEN);
3155 } else {
3156 unsigned int link_id = sta->deflink.link_id;
3157 struct ieee80211_link_data *link;
3158
3159 rcu_read_lock();
3160 link = rcu_dereference(sdata->link[link_id]);
3161 if (WARN_ON(!link)) {
3162 rcu_read_unlock();
3163 goto out;
3164 }
3165 memcpy(to: hdr->addr2, from: link->conf->addr, ETH_ALEN);
3166 rcu_read_unlock();
3167 }
3168 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3169 build.hdr_len = 24;
3170 break;
3171 default:
3172 /* not handled on fast-xmit */
3173 goto out;
3174 }
3175
3176 if (sta->sta.wme) {
3177 build.hdr_len += 2;
3178 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
3179 }
3180
3181 /* We store the key here so there's no point in using rcu_dereference()
3182 * but that's fine because the code that changes the pointers will call
3183 * this function after doing so. For a single CPU that would be enough,
3184 * for multiple see the comment above.
3185 */
3186 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
3187 if (!build.key)
3188 build.key = rcu_access_pointer(sdata->default_unicast_key);
3189 if (build.key) {
3190 bool gen_iv, iv_spc, mmic;
3191
3192 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
3193 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
3194 mmic = build.key->conf.flags &
3195 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
3196 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
3197
3198 /* don't handle software crypto */
3199 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
3200 goto out;
3201
3202 /* Key is being removed */
3203 if (build.key->flags & KEY_FLAG_TAINTED)
3204 goto out;
3205
3206 switch (build.key->conf.cipher) {
3207 case WLAN_CIPHER_SUITE_CCMP:
3208 case WLAN_CIPHER_SUITE_CCMP_256:
3209 if (gen_iv)
3210 build.pn_offs = build.hdr_len;
3211 if (gen_iv || iv_spc)
3212 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
3213 break;
3214 case WLAN_CIPHER_SUITE_GCMP:
3215 case WLAN_CIPHER_SUITE_GCMP_256:
3216 if (gen_iv)
3217 build.pn_offs = build.hdr_len;
3218 if (gen_iv || iv_spc)
3219 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3220 break;
3221 case WLAN_CIPHER_SUITE_TKIP:
3222 /* cannot handle MMIC or IV generation in xmit-fast */
3223 if (mmic || gen_iv)
3224 goto out;
3225 if (iv_spc)
3226 build.hdr_len += IEEE80211_TKIP_IV_LEN;
3227 break;
3228 case WLAN_CIPHER_SUITE_WEP40:
3229 case WLAN_CIPHER_SUITE_WEP104:
3230 /* cannot handle IV generation in fast-xmit */
3231 if (gen_iv)
3232 goto out;
3233 if (iv_spc)
3234 build.hdr_len += IEEE80211_WEP_IV_LEN;
3235 break;
3236 case WLAN_CIPHER_SUITE_AES_CMAC:
3237 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3238 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3239 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3240 WARN(1,
3241 "management cipher suite 0x%x enabled for data\n",
3242 build.key->conf.cipher);
3243 goto out;
3244 default:
3245 /* we don't know how to generate IVs for this at all */
3246 if (WARN_ON(gen_iv))
3247 goto out;
3248 }
3249
3250 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3251 }
3252
3253 hdr->frame_control = fc;
3254
3255 memcpy(to: build.hdr + build.hdr_len,
3256 from: rfc1042_header, len: sizeof(rfc1042_header));
3257 build.hdr_len += sizeof(rfc1042_header);
3258
3259 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3260 /* if the kmemdup fails, continue w/o fast_tx */
3261
3262 out:
3263 /* we might have raced against another call to this function */
3264 old = rcu_dereference_protected(sta->fast_tx,
3265 lockdep_is_held(&sta->lock));
3266 rcu_assign_pointer(sta->fast_tx, fast_tx);
3267 if (old)
3268 kfree_rcu(old, rcu_head);
3269 spin_unlock_bh(lock: &sta->lock);
3270}
3271
3272void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3273{
3274 struct sta_info *sta;
3275
3276 rcu_read_lock();
3277 list_for_each_entry_rcu(sta, &local->sta_list, list)
3278 ieee80211_check_fast_xmit(sta);
3279 rcu_read_unlock();
3280}
3281
3282void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3283{
3284 struct ieee80211_local *local = sdata->local;
3285 struct sta_info *sta;
3286
3287 rcu_read_lock();
3288
3289 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3290 if (sdata != sta->sdata &&
3291 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3292 continue;
3293 ieee80211_check_fast_xmit(sta);
3294 }
3295
3296 rcu_read_unlock();
3297}
3298
3299void ieee80211_clear_fast_xmit(struct sta_info *sta)
3300{
3301 struct ieee80211_fast_tx *fast_tx;
3302
3303 spin_lock_bh(lock: &sta->lock);
3304 fast_tx = rcu_dereference_protected(sta->fast_tx,
3305 lockdep_is_held(&sta->lock));
3306 RCU_INIT_POINTER(sta->fast_tx, NULL);
3307 spin_unlock_bh(lock: &sta->lock);
3308
3309 if (fast_tx)
3310 kfree_rcu(fast_tx, rcu_head);
3311}
3312
3313static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3314 struct sk_buff *skb, int headroom)
3315{
3316 if (skb_headroom(skb) < headroom) {
3317 I802_DEBUG_INC(local->tx_expand_skb_head);
3318
3319 if (pskb_expand_head(skb, nhead: headroom, ntail: 0, GFP_ATOMIC)) {
3320 wiphy_debug(local->hw.wiphy,
3321 "failed to reallocate TX buffer\n");
3322 return false;
3323 }
3324 }
3325
3326 return true;
3327}
3328
3329static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3330 struct ieee80211_fast_tx *fast_tx,
3331 struct sk_buff *skb)
3332{
3333 struct ieee80211_local *local = sdata->local;
3334 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3335 struct ieee80211_hdr *hdr;
3336 struct ethhdr *amsdu_hdr;
3337 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3338 int subframe_len = skb->len - hdr_len;
3339 void *data;
3340 u8 *qc, *h_80211_src, *h_80211_dst;
3341 const u8 *bssid;
3342
3343 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3344 return false;
3345
3346 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3347 return true;
3348
3349 if (!ieee80211_amsdu_realloc_pad(local, skb,
3350 headroom: sizeof(*amsdu_hdr) +
3351 local->hw.extra_tx_headroom))
3352 return false;
3353
3354 data = skb_push(skb, len: sizeof(*amsdu_hdr));
3355 memmove(dest: data, src: data + sizeof(*amsdu_hdr), count: hdr_len);
3356 hdr = data;
3357 amsdu_hdr = data + hdr_len;
3358 /* h_80211_src/dst is addr* field within hdr */
3359 h_80211_src = data + fast_tx->sa_offs;
3360 h_80211_dst = data + fast_tx->da_offs;
3361
3362 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3363 ether_addr_copy(dst: amsdu_hdr->h_source, src: h_80211_src);
3364 ether_addr_copy(dst: amsdu_hdr->h_dest, src: h_80211_dst);
3365
3366 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3367 * fields needs to be changed to BSSID for A-MSDU frames depending
3368 * on FromDS/ToDS values.
3369 */
3370 switch (sdata->vif.type) {
3371 case NL80211_IFTYPE_STATION:
3372 bssid = sdata->vif.cfg.ap_addr;
3373 break;
3374 case NL80211_IFTYPE_AP:
3375 case NL80211_IFTYPE_AP_VLAN:
3376 bssid = sdata->vif.addr;
3377 break;
3378 default:
3379 bssid = NULL;
3380 }
3381
3382 if (bssid && ieee80211_has_fromds(fc: hdr->frame_control))
3383 ether_addr_copy(dst: h_80211_src, src: bssid);
3384
3385 if (bssid && ieee80211_has_tods(fc: hdr->frame_control))
3386 ether_addr_copy(dst: h_80211_dst, src: bssid);
3387
3388 qc = ieee80211_get_qos_ctl(hdr);
3389 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3390
3391 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3392
3393 return true;
3394}
3395
3396static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3397 struct sta_info *sta,
3398 struct ieee80211_fast_tx *fast_tx,
3399 struct sk_buff *skb,
3400 const u8 *da, const u8 *sa)
3401{
3402 struct ieee80211_local *local = sdata->local;
3403 struct fq *fq = &local->fq;
3404 struct fq_tin *tin;
3405 struct fq_flow *flow;
3406 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3407 struct ieee80211_txq *txq = sta->sta.txq[tid];
3408 struct txq_info *txqi;
3409 struct sk_buff **frag_tail, *head;
3410 int subframe_len = skb->len - ETH_ALEN;
3411 u8 max_subframes = sta->sta.max_amsdu_subframes;
3412 int max_frags = local->hw.max_tx_fragments;
3413 int max_amsdu_len = sta->sta.cur->max_amsdu_len;
3414 int orig_truesize;
3415 u32 flow_idx;
3416 __be16 len;
3417 void *data;
3418 bool ret = false;
3419 unsigned int orig_len;
3420 int n = 2, nfrags, pad = 0;
3421 u16 hdrlen;
3422
3423 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3424 return false;
3425
3426 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED)
3427 return false;
3428
3429 if (ieee80211_vif_is_mesh(vif: &sdata->vif))
3430 return false;
3431
3432 if (skb_is_gso(skb))
3433 return false;
3434
3435 if (!txq)
3436 return false;
3437
3438 txqi = to_txq_info(txq);
3439 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3440 return false;
3441
3442 if (sta->sta.cur->max_rc_amsdu_len)
3443 max_amsdu_len = min_t(int, max_amsdu_len,
3444 sta->sta.cur->max_rc_amsdu_len);
3445
3446 if (sta->sta.cur->max_tid_amsdu_len[tid])
3447 max_amsdu_len = min_t(int, max_amsdu_len,
3448 sta->sta.cur->max_tid_amsdu_len[tid]);
3449
3450 flow_idx = fq_flow_idx(fq, skb);
3451
3452 spin_lock_bh(lock: &fq->lock);
3453
3454 /* TODO: Ideally aggregation should be done on dequeue to remain
3455 * responsive to environment changes.
3456 */
3457
3458 tin = &txqi->tin;
3459 flow = fq_flow_classify(fq, tin, idx: flow_idx, skb);
3460 head = skb_peek_tail(list_: &flow->queue);
3461 if (!head || skb_is_gso(skb: head))
3462 goto out;
3463
3464 orig_truesize = head->truesize;
3465 orig_len = head->len;
3466
3467 if (skb->len + head->len > max_amsdu_len)
3468 goto out;
3469
3470 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3471 nfrags += 1 + skb_shinfo(head)->nr_frags;
3472 frag_tail = &skb_shinfo(head)->frag_list;
3473 while (*frag_tail) {
3474 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3475 frag_tail = &(*frag_tail)->next;
3476 n++;
3477 }
3478
3479 if (max_subframes && n > max_subframes)
3480 goto out;
3481
3482 if (max_frags && nfrags > max_frags)
3483 goto out;
3484
3485 if (!drv_can_aggregate_in_amsdu(local, head, skb))
3486 goto out;
3487
3488 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, skb: head))
3489 goto out;
3490
3491 /* If n == 2, the "while (*frag_tail)" loop above didn't execute
3492 * and frag_tail should be &skb_shinfo(head)->frag_list.
3493 * However, ieee80211_amsdu_prepare_head() can reallocate it.
3494 * Reload frag_tail to have it pointing to the correct place.
3495 */
3496 if (n == 2)
3497 frag_tail = &skb_shinfo(head)->frag_list;
3498
3499 /*
3500 * Pad out the previous subframe to a multiple of 4 by adding the
3501 * padding to the next one, that's being added. Note that head->len
3502 * is the length of the full A-MSDU, but that works since each time
3503 * we add a new subframe we pad out the previous one to a multiple
3504 * of 4 and thus it no longer matters in the next round.
3505 */
3506 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3507 if ((head->len - hdrlen) & 3)
3508 pad = 4 - ((head->len - hdrlen) & 3);
3509
3510 if (!ieee80211_amsdu_realloc_pad(local, skb, headroom: sizeof(rfc1042_header) +
3511 2 + pad))
3512 goto out_recalc;
3513
3514 ret = true;
3515 data = skb_push(skb, ETH_ALEN + 2);
3516 ether_addr_copy(dst: data, src: da);
3517 ether_addr_copy(dst: data + ETH_ALEN, src: sa);
3518
3519 data += 2 * ETH_ALEN;
3520 len = cpu_to_be16(subframe_len);
3521 memcpy(to: data, from: &len, len: 2);
3522 memcpy(to: data + 2, from: rfc1042_header, len: sizeof(rfc1042_header));
3523
3524 memset(s: skb_push(skb, len: pad), c: 0, n: pad);
3525
3526 head->len += skb->len;
3527 head->data_len += skb->len;
3528 *frag_tail = skb;
3529
3530out_recalc:
3531 fq->memory_usage += head->truesize - orig_truesize;
3532 if (head->len != orig_len) {
3533 flow->backlog += head->len - orig_len;
3534 tin->backlog_bytes += head->len - orig_len;
3535 }
3536out:
3537 spin_unlock_bh(lock: &fq->lock);
3538
3539 return ret;
3540}
3541
3542/*
3543 * Can be called while the sta lock is held. Anything that can cause packets to
3544 * be generated will cause deadlock!
3545 */
3546static ieee80211_tx_result
3547ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3548 struct sta_info *sta, u8 pn_offs,
3549 struct ieee80211_key *key,
3550 struct ieee80211_tx_data *tx)
3551{
3552 struct sk_buff *skb = tx->skb;
3553 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3554 struct ieee80211_hdr *hdr = (void *)skb->data;
3555 u8 tid = IEEE80211_NUM_TIDS;
3556
3557 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) &&
3558 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE)
3559 return TX_DROP;
3560
3561 if (key)
3562 info->control.hw_key = &key->conf;
3563
3564 dev_sw_netstats_tx_add(dev: skb->dev, packets: 1, len: skb->len);
3565
3566 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3567 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3568 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3569 } else {
3570 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3571 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3572 sdata->sequence_number += 0x10;
3573 }
3574
3575 if (skb_shinfo(skb)->gso_size)
3576 sta->deflink.tx_stats.msdu[tid] +=
3577 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3578 else
3579 sta->deflink.tx_stats.msdu[tid]++;
3580
3581 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3582
3583 /* statistics normally done by ieee80211_tx_h_stats (but that
3584 * has to consider fragmentation, so is more complex)
3585 */
3586 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3587 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++;
3588
3589 if (pn_offs) {
3590 u64 pn;
3591 u8 *crypto_hdr = skb->data + pn_offs;
3592
3593 switch (key->conf.cipher) {
3594 case WLAN_CIPHER_SUITE_CCMP:
3595 case WLAN_CIPHER_SUITE_CCMP_256:
3596 case WLAN_CIPHER_SUITE_GCMP:
3597 case WLAN_CIPHER_SUITE_GCMP_256:
3598 pn = atomic64_inc_return(v: &key->conf.tx_pn);
3599 crypto_hdr[0] = pn;
3600 crypto_hdr[1] = pn >> 8;
3601 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6);
3602 crypto_hdr[4] = pn >> 16;
3603 crypto_hdr[5] = pn >> 24;
3604 crypto_hdr[6] = pn >> 32;
3605 crypto_hdr[7] = pn >> 40;
3606 break;
3607 }
3608 }
3609
3610 return TX_CONTINUE;
3611}
3612
3613static netdev_features_t
3614ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata)
3615{
3616 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3617 return sdata->vif.netdev_features;
3618
3619 if (!sdata->bss)
3620 return 0;
3621
3622 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
3623 return sdata->vif.netdev_features;
3624}
3625
3626static struct sk_buff *
3627ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features)
3628{
3629 if (skb_is_gso(skb)) {
3630 struct sk_buff *segs;
3631
3632 segs = skb_gso_segment(skb, features);
3633 if (!segs)
3634 return skb;
3635 if (IS_ERR(ptr: segs))
3636 goto free;
3637
3638 consume_skb(skb);
3639 return segs;
3640 }
3641
3642 if (skb_needs_linearize(skb, features) && __skb_linearize(skb))
3643 goto free;
3644
3645 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3646 int ofs = skb_checksum_start_offset(skb);
3647
3648 if (skb->encapsulation)
3649 skb_set_inner_transport_header(skb, offset: ofs);
3650 else
3651 skb_set_transport_header(skb, offset: ofs);
3652
3653 if (skb_csum_hwoffload_help(skb, features))
3654 goto free;
3655 }
3656
3657 skb_mark_not_on_list(skb);
3658 return skb;
3659
3660free:
3661 kfree_skb(skb);
3662 return NULL;
3663}
3664
3665void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3666 struct sta_info *sta,
3667 struct ieee80211_fast_tx *fast_tx,
3668 struct sk_buff *skb, bool ampdu,
3669 const u8 *da, const u8 *sa)
3670{
3671 struct ieee80211_local *local = sdata->local;
3672 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3673 struct ieee80211_tx_info *info;
3674 struct ieee80211_tx_data tx;
3675 ieee80211_tx_result r;
3676 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3677 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3678
3679 skb = skb_share_check(skb, GFP_ATOMIC);
3680 if (unlikely(!skb))
3681 return;
3682
3683 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3684 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa))
3685 return;
3686
3687 /* will not be crypto-handled beyond what we do here, so use false
3688 * as the may-encrypt argument for the resize to not account for
3689 * more room than we already have in 'extra_head'
3690 */
3691 if (unlikely(ieee80211_skb_resize(sdata, skb,
3692 max_t(int, extra_head + hw_headroom -
3693 skb_headroom(skb), 0),
3694 ENCRYPT_NO)))
3695 goto free;
3696
3697 hdr = skb_push(skb, len: extra_head);
3698 memcpy(to: skb->data, from: fast_tx->hdr, len: fast_tx->hdr_len);
3699 memcpy(to: skb->data + fast_tx->da_offs, from: da, ETH_ALEN);
3700 memcpy(to: skb->data + fast_tx->sa_offs, from: sa, ETH_ALEN);
3701
3702 info = IEEE80211_SKB_CB(skb);
3703 memset(s: info, c: 0, n: sizeof(*info));
3704 info->band = fast_tx->band;
3705 info->control.vif = &sdata->vif;
3706 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3707 IEEE80211_TX_CTL_DONTFRAG;
3708 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT |
3709 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED,
3710 field: IEEE80211_TX_CTRL_MLO_LINK);
3711
3712#ifdef CONFIG_MAC80211_DEBUGFS
3713 if (local->force_tx_status)
3714 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
3715#endif
3716
3717 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3718 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3719
3720 *ieee80211_get_qos_ctl(hdr) = tid;
3721 }
3722
3723 __skb_queue_head_init(list: &tx.skbs);
3724
3725 tx.flags = IEEE80211_TX_UNICAST;
3726 tx.local = local;
3727 tx.sdata = sdata;
3728 tx.sta = sta;
3729 tx.key = fast_tx->key;
3730
3731 if (ieee80211_queue_skb(local, sdata, sta, skb))
3732 return;
3733
3734 tx.skb = skb;
3735 r = ieee80211_xmit_fast_finish(sdata, sta, pn_offs: fast_tx->pn_offs,
3736 key: fast_tx->key, tx: &tx);
3737 tx.skb = NULL;
3738 if (r == TX_DROP) {
3739 tx.sdata->tx_handlers_drop++;
3740 goto free;
3741 }
3742
3743 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3744 sdata = container_of(sdata->bss,
3745 struct ieee80211_sub_if_data, u.ap);
3746
3747 __skb_queue_tail(list: &tx.skbs, newsk: skb);
3748 ieee80211_tx_frags(local, vif: &sdata->vif, sta, skbs: &tx.skbs, txpending: false);
3749 return;
3750
3751free:
3752 kfree_skb(skb);
3753}
3754
3755static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3756 struct sta_info *sta,
3757 struct ieee80211_fast_tx *fast_tx,
3758 struct sk_buff *skb)
3759{
3760 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3761 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3762 struct tid_ampdu_tx *tid_tx = NULL;
3763 struct sk_buff *next;
3764 struct ethhdr eth;
3765 u8 tid = IEEE80211_NUM_TIDS;
3766
3767 /* control port protocol needs a lot of special handling */
3768 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3769 return false;
3770
3771 /* only RFC 1042 SNAP */
3772 if (ethertype < ETH_P_802_3_MIN)
3773 return false;
3774
3775 /* don't handle TX status request here either */
3776 if (sk_requests_wifi_status(sk: skb->sk))
3777 return false;
3778
3779 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3780 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3781 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3782 if (tid_tx) {
3783 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3784 return false;
3785 if (tid_tx->timeout)
3786 tid_tx->last_tx = jiffies;
3787 }
3788 }
3789
3790 memcpy(to: &eth, from: skb->data, ETH_HLEN - 2);
3791
3792 /* after this point (skb is modified) we cannot return false */
3793 skb = ieee80211_tx_skb_fixup(skb, features: ieee80211_sdata_netdev_features(sdata));
3794 if (!skb)
3795 return true;
3796
3797 skb_list_walk_safe(skb, skb, next) {
3798 skb_mark_not_on_list(skb);
3799 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, ampdu: tid_tx,
3800 da: eth.h_dest, sa: eth.h_source);
3801 }
3802
3803 return true;
3804}
3805
3806struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3807 struct ieee80211_txq *txq)
3808{
3809 struct ieee80211_local *local = hw_to_local(hw);
3810 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3811 struct ieee80211_hdr *hdr;
3812 struct sk_buff *skb = NULL;
3813 struct fq *fq = &local->fq;
3814 struct fq_tin *tin = &txqi->tin;
3815 struct ieee80211_tx_info *info;
3816 struct ieee80211_tx_data tx;
3817 ieee80211_tx_result r;
3818 struct ieee80211_vif *vif = txq->vif;
3819 int q = vif->hw_queue[txq->ac];
3820 unsigned long flags;
3821 bool q_stopped;
3822
3823 WARN_ON_ONCE(softirq_count() == 0);
3824
3825 if (!ieee80211_txq_airtime_check(hw, txq))
3826 return NULL;
3827
3828begin:
3829 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3830 q_stopped = local->queue_stop_reasons[q];
3831 spin_unlock_irqrestore(lock: &local->queue_stop_reason_lock, flags);
3832
3833 if (unlikely(q_stopped)) {
3834 /* mark for waking later */
3835 set_bit(nr: IEEE80211_TXQ_DIRTY, addr: &txqi->flags);
3836 return NULL;
3837 }
3838
3839 spin_lock_bh(lock: &fq->lock);
3840
3841 /* Make sure fragments stay together. */
3842 skb = __skb_dequeue(list: &txqi->frags);
3843 if (unlikely(skb)) {
3844 if (!(IEEE80211_SKB_CB(skb)->control.flags &
3845 IEEE80211_TX_INTCFL_NEED_TXPROCESSING))
3846 goto out;
3847 IEEE80211_SKB_CB(skb)->control.flags &=
3848 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
3849 } else {
3850 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags)))
3851 goto out;
3852
3853 skb = fq_tin_dequeue(fq, tin, dequeue_func: fq_tin_dequeue_func);
3854 }
3855
3856 if (!skb)
3857 goto out;
3858
3859 spin_unlock_bh(lock: &fq->lock);
3860
3861 hdr = (struct ieee80211_hdr *)skb->data;
3862 info = IEEE80211_SKB_CB(skb);
3863
3864 memset(s: &tx, c: 0, n: sizeof(tx));
3865 __skb_queue_head_init(list: &tx.skbs);
3866 tx.local = local;
3867 tx.skb = skb;
3868 tx.sdata = vif_to_sdata(p: info->control.vif);
3869
3870 if (txq->sta) {
3871 tx.sta = container_of(txq->sta, struct sta_info, sta);
3872 /*
3873 * Drop unicast frames to unauthorised stations unless they are
3874 * injected frames or EAPOL frames from the local station.
3875 */
3876 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
3877 ieee80211_is_data(hdr->frame_control) &&
3878 !ieee80211_vif_is_mesh(&tx.sdata->vif) &&
3879 tx.sdata->vif.type != NL80211_IFTYPE_OCB &&
3880 !is_multicast_ether_addr(hdr->addr1) &&
3881 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) &&
3882 (!(info->control.flags &
3883 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) ||
3884 !ieee80211_is_our_addr(tx.sdata, hdr->addr2,
3885 NULL)))) {
3886 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
3887 ieee80211_free_txskb(hw: &local->hw, skb);
3888 goto begin;
3889 }
3890 }
3891
3892 /*
3893 * The key can be removed while the packet was queued, so need to call
3894 * this here to get the current key.
3895 */
3896 info->control.hw_key = NULL;
3897 r = ieee80211_tx_h_select_key(tx: &tx);
3898 if (r != TX_CONTINUE) {
3899 ieee80211_free_txskb(hw: &local->hw, skb);
3900 goto begin;
3901 }
3902
3903 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3904 info->flags |= (IEEE80211_TX_CTL_AMPDU |
3905 IEEE80211_TX_CTL_DONTFRAG);
3906
3907 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
3908 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3909 r = ieee80211_tx_h_rate_ctrl(tx: &tx);
3910 if (r != TX_CONTINUE) {
3911 ieee80211_free_txskb(hw: &local->hw, skb);
3912 goto begin;
3913 }
3914 }
3915 goto encap_out;
3916 }
3917
3918 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3919 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3920 sta);
3921 u8 pn_offs = 0;
3922
3923 if (tx.key &&
3924 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3925 pn_offs = ieee80211_hdrlen(fc: hdr->frame_control);
3926
3927 r = ieee80211_xmit_fast_finish(sdata: sta->sdata, sta, pn_offs,
3928 key: tx.key, tx: &tx);
3929 if (r != TX_CONTINUE) {
3930 ieee80211_free_txskb(hw: &local->hw, skb);
3931 goto begin;
3932 }
3933 } else {
3934 if (invoke_tx_handlers_late(tx: &tx))
3935 goto begin;
3936
3937 skb = __skb_dequeue(list: &tx.skbs);
3938 info = IEEE80211_SKB_CB(skb);
3939
3940 if (!skb_queue_empty(list: &tx.skbs)) {
3941 spin_lock_bh(lock: &fq->lock);
3942 skb_queue_splice_tail(list: &tx.skbs, head: &txqi->frags);
3943 spin_unlock_bh(lock: &fq->lock);
3944 }
3945 }
3946
3947 if (skb_has_frag_list(skb) &&
3948 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3949 if (skb_linearize(skb)) {
3950 ieee80211_free_txskb(hw: &local->hw, skb);
3951 goto begin;
3952 }
3953 }
3954
3955 switch (tx.sdata->vif.type) {
3956 case NL80211_IFTYPE_MONITOR:
3957 if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) ||
3958 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) {
3959 vif = &tx.sdata->vif;
3960 break;
3961 }
3962 tx.sdata = rcu_dereference(local->monitor_sdata);
3963 if (tx.sdata &&
3964 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) {
3965 vif = &tx.sdata->vif;
3966 info->hw_queue =
3967 vif->hw_queue[skb_get_queue_mapping(skb)];
3968 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3969 ieee80211_free_txskb(hw: &local->hw, skb);
3970 goto begin;
3971 } else {
3972 info->control.vif = NULL;
3973 return skb;
3974 }
3975 break;
3976 case NL80211_IFTYPE_AP_VLAN:
3977 tx.sdata = container_of(tx.sdata->bss,
3978 struct ieee80211_sub_if_data, u.ap);
3979 fallthrough;
3980 default:
3981 vif = &tx.sdata->vif;
3982 break;
3983 }
3984
3985encap_out:
3986 info->control.vif = vif;
3987
3988 if (tx.sta &&
3989 wiphy_ext_feature_isset(wiphy: local->hw.wiphy, ftidx: NL80211_EXT_FEATURE_AQL)) {
3990 bool ampdu = txq->ac != IEEE80211_AC_VO;
3991 u32 airtime;
3992
3993 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, pubsta: txq->sta,
3994 len: skb->len, ampdu);
3995 if (airtime) {
3996 airtime = ieee80211_info_set_tx_time_est(info, tx_time_est: airtime);
3997 ieee80211_sta_update_pending_airtime(local, sta: tx.sta,
3998 ac: txq->ac,
3999 tx_airtime: airtime,
4000 tx_completed: false);
4001 }
4002 }
4003
4004 return skb;
4005
4006out:
4007 spin_unlock_bh(lock: &fq->lock);
4008
4009 return skb;
4010}
4011EXPORT_SYMBOL(ieee80211_tx_dequeue);
4012
4013static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac)
4014{
4015 struct airtime_info *air_info = &sta->airtime[ac];
4016
4017 return air_info->deficit - atomic_read(v: &air_info->aql_tx_pending);
4018}
4019
4020static void
4021ieee80211_txq_set_active(struct txq_info *txqi)
4022{
4023 struct sta_info *sta;
4024
4025 if (!txqi->txq.sta)
4026 return;
4027
4028 sta = container_of(txqi->txq.sta, struct sta_info, sta);
4029 sta->airtime[txqi->txq.ac].last_active = jiffies;
4030}
4031
4032static bool
4033ieee80211_txq_keep_active(struct txq_info *txqi)
4034{
4035 struct sta_info *sta;
4036
4037 if (!txqi->txq.sta)
4038 return false;
4039
4040 sta = container_of(txqi->txq.sta, struct sta_info, sta);
4041 if (ieee80211_sta_deficit(sta, ac: txqi->txq.ac) >= 0)
4042 return false;
4043
4044 return ieee80211_sta_keep_active(sta, ac: txqi->txq.ac);
4045}
4046
4047struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
4048{
4049 struct ieee80211_local *local = hw_to_local(hw);
4050 struct ieee80211_txq *ret = NULL;
4051 struct txq_info *txqi = NULL, *head = NULL;
4052 bool found_eligible_txq = false;
4053
4054 spin_lock_bh(lock: &local->active_txq_lock[ac]);
4055
4056 if (!local->schedule_round[ac])
4057 goto out;
4058
4059 begin:
4060 txqi = list_first_entry_or_null(&local->active_txqs[ac],
4061 struct txq_info,
4062 schedule_order);
4063 if (!txqi)
4064 goto out;
4065
4066 if (txqi == head) {
4067 if (!found_eligible_txq)
4068 goto out;
4069 else
4070 found_eligible_txq = false;
4071 }
4072
4073 if (!head)
4074 head = txqi;
4075
4076 if (txqi->txq.sta) {
4077 struct sta_info *sta = container_of(txqi->txq.sta,
4078 struct sta_info, sta);
4079 bool aql_check = ieee80211_txq_airtime_check(hw, txq: &txqi->txq);
4080 s32 deficit = ieee80211_sta_deficit(sta, ac: txqi->txq.ac);
4081
4082 if (aql_check)
4083 found_eligible_txq = true;
4084
4085 if (deficit < 0)
4086 sta->airtime[txqi->txq.ac].deficit +=
4087 sta->airtime_weight;
4088
4089 if (deficit < 0 || !aql_check) {
4090 list_move_tail(list: &txqi->schedule_order,
4091 head: &local->active_txqs[txqi->txq.ac]);
4092 goto begin;
4093 }
4094 }
4095
4096 if (txqi->schedule_round == local->schedule_round[ac])
4097 goto out;
4098
4099 list_del_init(entry: &txqi->schedule_order);
4100 txqi->schedule_round = local->schedule_round[ac];
4101 ret = &txqi->txq;
4102
4103out:
4104 spin_unlock_bh(lock: &local->active_txq_lock[ac]);
4105 return ret;
4106}
4107EXPORT_SYMBOL(ieee80211_next_txq);
4108
4109void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
4110 struct ieee80211_txq *txq,
4111 bool force)
4112{
4113 struct ieee80211_local *local = hw_to_local(hw);
4114 struct txq_info *txqi = to_txq_info(txq);
4115 bool has_queue;
4116
4117 spin_lock_bh(lock: &local->active_txq_lock[txq->ac]);
4118
4119 has_queue = force ||
4120 (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) &&
4121 txq_has_queue(txq));
4122 if (list_empty(head: &txqi->schedule_order) &&
4123 (has_queue || ieee80211_txq_keep_active(txqi))) {
4124 /* If airtime accounting is active, always enqueue STAs at the
4125 * head of the list to ensure that they only get moved to the
4126 * back by the airtime DRR scheduler once they have a negative
4127 * deficit. A station that already has a negative deficit will
4128 * get immediately moved to the back of the list on the next
4129 * call to ieee80211_next_txq().
4130 */
4131 if (txqi->txq.sta && local->airtime_flags && has_queue &&
4132 wiphy_ext_feature_isset(wiphy: local->hw.wiphy,
4133 ftidx: NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
4134 list_add(new: &txqi->schedule_order,
4135 head: &local->active_txqs[txq->ac]);
4136 else
4137 list_add_tail(new: &txqi->schedule_order,
4138 head: &local->active_txqs[txq->ac]);
4139 if (has_queue)
4140 ieee80211_txq_set_active(txqi);
4141 }
4142
4143 spin_unlock_bh(lock: &local->active_txq_lock[txq->ac]);
4144}
4145EXPORT_SYMBOL(__ieee80211_schedule_txq);
4146
4147DEFINE_STATIC_KEY_FALSE(aql_disable);
4148
4149bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw,
4150 struct ieee80211_txq *txq)
4151{
4152 struct sta_info *sta;
4153 struct ieee80211_local *local = hw_to_local(hw);
4154
4155 if (!wiphy_ext_feature_isset(wiphy: local->hw.wiphy, ftidx: NL80211_EXT_FEATURE_AQL))
4156 return true;
4157
4158 if (static_branch_unlikely(&aql_disable))
4159 return true;
4160
4161 if (!txq->sta)
4162 return true;
4163
4164 if (unlikely(txq->tid == IEEE80211_NUM_TIDS))
4165 return true;
4166
4167 sta = container_of(txq->sta, struct sta_info, sta);
4168 if (atomic_read(v: &sta->airtime[txq->ac].aql_tx_pending) <
4169 sta->airtime[txq->ac].aql_limit_low)
4170 return true;
4171
4172 if (atomic_read(v: &local->aql_total_pending_airtime) <
4173 local->aql_threshold &&
4174 atomic_read(v: &sta->airtime[txq->ac].aql_tx_pending) <
4175 sta->airtime[txq->ac].aql_limit_high)
4176 return true;
4177
4178 return false;
4179}
4180EXPORT_SYMBOL(ieee80211_txq_airtime_check);
4181
4182static bool
4183ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac)
4184{
4185 unsigned int num_txq = 0;
4186 struct txq_info *txq;
4187 u32 aql_limit;
4188
4189 if (!wiphy_ext_feature_isset(wiphy: local->hw.wiphy, ftidx: NL80211_EXT_FEATURE_AQL))
4190 return true;
4191
4192 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order)
4193 num_txq++;
4194
4195 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 +
4196 local->aql_txq_limit_high[ac];
4197
4198 return atomic_read(v: &local->aql_ac_pending_airtime[ac]) < aql_limit;
4199}
4200
4201bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw,
4202 struct ieee80211_txq *txq)
4203{
4204 struct ieee80211_local *local = hw_to_local(hw);
4205 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq);
4206 struct sta_info *sta;
4207 u8 ac = txq->ac;
4208
4209 spin_lock_bh(lock: &local->active_txq_lock[ac]);
4210
4211 if (!txqi->txq.sta)
4212 goto out;
4213
4214 if (list_empty(head: &txqi->schedule_order))
4215 goto out;
4216
4217 if (!ieee80211_txq_schedule_airtime_check(local, ac))
4218 goto out;
4219
4220 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac],
4221 schedule_order) {
4222 if (iter == txqi)
4223 break;
4224
4225 if (!iter->txq.sta) {
4226 list_move_tail(list: &iter->schedule_order,
4227 head: &local->active_txqs[ac]);
4228 continue;
4229 }
4230 sta = container_of(iter->txq.sta, struct sta_info, sta);
4231 if (ieee80211_sta_deficit(sta, ac) < 0)
4232 sta->airtime[ac].deficit += sta->airtime_weight;
4233 list_move_tail(list: &iter->schedule_order, head: &local->active_txqs[ac]);
4234 }
4235
4236 sta = container_of(txqi->txq.sta, struct sta_info, sta);
4237 if (sta->airtime[ac].deficit >= 0)
4238 goto out;
4239
4240 sta->airtime[ac].deficit += sta->airtime_weight;
4241 list_move_tail(list: &txqi->schedule_order, head: &local->active_txqs[ac]);
4242 spin_unlock_bh(lock: &local->active_txq_lock[ac]);
4243
4244 return false;
4245out:
4246 if (!list_empty(head: &txqi->schedule_order))
4247 list_del_init(entry: &txqi->schedule_order);
4248 spin_unlock_bh(lock: &local->active_txq_lock[ac]);
4249
4250 return true;
4251}
4252EXPORT_SYMBOL(ieee80211_txq_may_transmit);
4253
4254void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac)
4255{
4256 struct ieee80211_local *local = hw_to_local(hw);
4257
4258 spin_lock_bh(lock: &local->active_txq_lock[ac]);
4259
4260 if (ieee80211_txq_schedule_airtime_check(local, ac)) {
4261 local->schedule_round[ac]++;
4262 if (!local->schedule_round[ac])
4263 local->schedule_round[ac]++;
4264 } else {
4265 local->schedule_round[ac] = 0;
4266 }
4267
4268 spin_unlock_bh(lock: &local->active_txq_lock[ac]);
4269}
4270EXPORT_SYMBOL(ieee80211_txq_schedule_start);
4271
4272void __ieee80211_subif_start_xmit(struct sk_buff *skb,
4273 struct net_device *dev,
4274 u32 info_flags,
4275 u32 ctrl_flags,
4276 u64 *cookie)
4277{
4278 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4279 struct ieee80211_local *local = sdata->local;
4280 struct sta_info *sta;
4281 struct sk_buff *next;
4282 int len = skb->len;
4283
4284 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) {
4285 kfree_skb(skb);
4286 return;
4287 }
4288
4289 sk_pacing_shift_update(sk: skb->sk, val: sdata->local->hw.tx_sk_pacing_shift);
4290
4291 rcu_read_lock();
4292
4293 if (ieee80211_vif_is_mesh(vif: &sdata->vif) &&
4294 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) &&
4295 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags))
4296 goto out;
4297
4298 if (ieee80211_lookup_ra_sta(sdata, skb, sta_out: &sta))
4299 goto out_free;
4300
4301 if (IS_ERR(ptr: sta))
4302 sta = NULL;
4303
4304 skb_set_queue_mapping(skb, queue_mapping: ieee80211_select_queue(sdata, sta, skb));
4305 ieee80211_aggr_check(sdata, sta, skb);
4306
4307 if (sta) {
4308 struct ieee80211_fast_tx *fast_tx;
4309
4310 fast_tx = rcu_dereference(sta->fast_tx);
4311
4312 if (fast_tx &&
4313 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
4314 goto out;
4315 }
4316
4317 /* the frame could be fragmented, software-encrypted, and other
4318 * things so we cannot really handle checksum or GSO offload.
4319 * fix it up in software before we handle anything else.
4320 */
4321 skb = ieee80211_tx_skb_fixup(skb, features: 0);
4322 if (!skb) {
4323 len = 0;
4324 goto out;
4325 }
4326
4327 skb_list_walk_safe(skb, skb, next) {
4328 skb_mark_not_on_list(skb);
4329
4330 if (skb->protocol == sdata->control_port_protocol)
4331 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
4332
4333 skb = ieee80211_build_hdr(sdata, skb, info_flags,
4334 sta, ctrl_flags, cookie);
4335 if (IS_ERR(ptr: skb)) {
4336 kfree_skb_list(segs: next);
4337 goto out;
4338 }
4339
4340 dev_sw_netstats_tx_add(dev, packets: 1, len: skb->len);
4341
4342 ieee80211_xmit(sdata, sta, skb);
4343 }
4344 goto out;
4345 out_free:
4346 kfree_skb(skb);
4347 len = 0;
4348 out:
4349 if (len)
4350 ieee80211_tpt_led_trig_tx(local, bytes: len);
4351 rcu_read_unlock();
4352}
4353
4354static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
4355{
4356 struct ethhdr *eth;
4357 int err;
4358
4359 err = skb_ensure_writable(skb, ETH_HLEN);
4360 if (unlikely(err))
4361 return err;
4362
4363 eth = (void *)skb->data;
4364 ether_addr_copy(dst: eth->h_dest, src: sta->sta.addr);
4365
4366 return 0;
4367}
4368
4369static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
4370 struct net_device *dev)
4371{
4372 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4373 const struct ethhdr *eth = (void *)skb->data;
4374 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
4375 __be16 ethertype;
4376
4377 switch (sdata->vif.type) {
4378 case NL80211_IFTYPE_AP_VLAN:
4379 if (sdata->u.vlan.sta)
4380 return false;
4381 if (sdata->wdev.use_4addr)
4382 return false;
4383 fallthrough;
4384 case NL80211_IFTYPE_AP:
4385 /* check runtime toggle for this bss */
4386 if (!sdata->bss->multicast_to_unicast)
4387 return false;
4388 break;
4389 default:
4390 return false;
4391 }
4392
4393 /* multicast to unicast conversion only for some payload */
4394 ethertype = eth->h_proto;
4395 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
4396 ethertype = ethvlan->h_vlan_encapsulated_proto;
4397 switch (ethertype) {
4398 case htons(ETH_P_ARP):
4399 case htons(ETH_P_IP):
4400 case htons(ETH_P_IPV6):
4401 break;
4402 default:
4403 return false;
4404 }
4405
4406 return true;
4407}
4408
4409static void
4410ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
4411 struct sk_buff_head *queue)
4412{
4413 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4414 struct ieee80211_local *local = sdata->local;
4415 const struct ethhdr *eth = (struct ethhdr *)skb->data;
4416 struct sta_info *sta, *first = NULL;
4417 struct sk_buff *cloned_skb;
4418
4419 rcu_read_lock();
4420
4421 list_for_each_entry_rcu(sta, &local->sta_list, list) {
4422 if (sdata != sta->sdata)
4423 /* AP-VLAN mismatch */
4424 continue;
4425 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
4426 /* do not send back to source */
4427 continue;
4428 if (!first) {
4429 first = sta;
4430 continue;
4431 }
4432 cloned_skb = skb_clone(skb, GFP_ATOMIC);
4433 if (!cloned_skb)
4434 goto multicast;
4435 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
4436 dev_kfree_skb(cloned_skb);
4437 goto multicast;
4438 }
4439 __skb_queue_tail(list: queue, newsk: cloned_skb);
4440 }
4441
4442 if (likely(first)) {
4443 if (unlikely(ieee80211_change_da(skb, first)))
4444 goto multicast;
4445 __skb_queue_tail(list: queue, newsk: skb);
4446 } else {
4447 /* no STA connected, drop */
4448 kfree_skb(skb);
4449 skb = NULL;
4450 }
4451
4452 goto out;
4453multicast:
4454 __skb_queue_purge(list: queue);
4455 __skb_queue_tail(list: queue, newsk: skb);
4456out:
4457 rcu_read_unlock();
4458}
4459
4460static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata,
4461 struct sk_buff *skb, u32 ctrl_flags,
4462 unsigned int link_id)
4463{
4464 struct sk_buff *out;
4465
4466 out = skb_copy(skb, GFP_ATOMIC);
4467 if (!out)
4468 return;
4469
4470 ctrl_flags |= u32_encode_bits(v: link_id, field: IEEE80211_TX_CTRL_MLO_LINK);
4471 __ieee80211_subif_start_xmit(skb: out, dev: sdata->dev, info_flags: 0, ctrl_flags, NULL);
4472}
4473
4474static void ieee80211_mlo_multicast_tx(struct net_device *dev,
4475 struct sk_buff *skb)
4476{
4477 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4478 unsigned long links = sdata->vif.active_links;
4479 unsigned int link;
4480 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX;
4481
4482 if (hweight16(links) == 1) {
4483 ctrl_flags |= u32_encode_bits(__ffs(links),
4484 field: IEEE80211_TX_CTRL_MLO_LINK);
4485
4486 __ieee80211_subif_start_xmit(skb, dev: sdata->dev, info_flags: 0, ctrl_flags,
4487 NULL);
4488 return;
4489 }
4490
4491 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) {
4492 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link_id: link);
4493 ctrl_flags = 0;
4494 }
4495 kfree_skb(skb);
4496}
4497
4498/**
4499 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
4500 * @skb: packet to be sent
4501 * @dev: incoming interface
4502 *
4503 * On failure skb will be freed.
4504 *
4505 * Returns: the netdev TX status (but really only %NETDEV_TX_OK)
4506 */
4507netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
4508 struct net_device *dev)
4509{
4510 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4511 const struct ethhdr *eth = (void *)skb->data;
4512
4513 if (likely(!is_multicast_ether_addr(eth->h_dest)))
4514 goto normal;
4515
4516 if (unlikely(!ieee80211_sdata_running(sdata))) {
4517 kfree_skb(skb);
4518 return NETDEV_TX_OK;
4519 }
4520
4521 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
4522 struct sk_buff_head queue;
4523
4524 __skb_queue_head_init(list: &queue);
4525 ieee80211_convert_to_unicast(skb, dev, queue: &queue);
4526 while ((skb = __skb_dequeue(list: &queue)))
4527 __ieee80211_subif_start_xmit(skb, dev, info_flags: 0,
4528 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4529 NULL);
4530 } else if (ieee80211_vif_is_mld(vif: &sdata->vif) &&
4531 ((sdata->vif.type == NL80211_IFTYPE_AP &&
4532 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) ||
4533 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4534 !sdata->wdev.use_4addr))) {
4535 ieee80211_mlo_multicast_tx(dev, skb);
4536 } else {
4537normal:
4538 __ieee80211_subif_start_xmit(skb, dev, info_flags: 0,
4539 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4540 NULL);
4541 }
4542
4543 return NETDEV_TX_OK;
4544}
4545
4546
4547
4548static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
4549 struct sk_buff *skb, struct sta_info *sta,
4550 bool txpending)
4551{
4552 struct ieee80211_local *local = sdata->local;
4553 struct ieee80211_tx_control control = {};
4554 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4555 struct ieee80211_sta *pubsta = NULL;
4556 unsigned long flags;
4557 int q = info->hw_queue;
4558
4559 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4560
4561 if (local->queue_stop_reasons[q] ||
4562 (!txpending && !skb_queue_empty(list: &local->pending[q]))) {
4563 if (txpending)
4564 skb_queue_head(list: &local->pending[q], newsk: skb);
4565 else
4566 skb_queue_tail(list: &local->pending[q], newsk: skb);
4567
4568 spin_unlock_irqrestore(lock: &local->queue_stop_reason_lock, flags);
4569
4570 return false;
4571 }
4572
4573 spin_unlock_irqrestore(lock: &local->queue_stop_reason_lock, flags);
4574
4575 if (sta && sta->uploaded)
4576 pubsta = &sta->sta;
4577
4578 control.sta = pubsta;
4579
4580 drv_tx(local, control: &control, skb);
4581
4582 return true;
4583}
4584
4585static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
4586 struct sk_buff *skb, struct sta_info *sta,
4587 bool txpending)
4588{
4589 struct ieee80211_local *local = sdata->local;
4590 struct sk_buff *next;
4591 bool ret = true;
4592
4593 if (ieee80211_queue_skb(local, sdata, sta, skb))
4594 return true;
4595
4596 skb_list_walk_safe(skb, skb, next) {
4597 skb_mark_not_on_list(skb);
4598 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending))
4599 ret = false;
4600 }
4601
4602 return ret;
4603}
4604
4605static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
4606 struct net_device *dev, struct sta_info *sta,
4607 struct ieee80211_key *key, struct sk_buff *skb)
4608{
4609 struct ieee80211_tx_info *info;
4610 struct ieee80211_local *local = sdata->local;
4611 struct tid_ampdu_tx *tid_tx;
4612 struct sk_buff *seg, *next;
4613 unsigned int skbs = 0, len = 0;
4614 u16 queue;
4615 u8 tid;
4616
4617 queue = ieee80211_select_queue(sdata, sta, skb);
4618 skb_set_queue_mapping(skb, queue_mapping: queue);
4619
4620 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) &&
4621 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
4622 goto out_free;
4623
4624 skb = skb_share_check(skb, GFP_ATOMIC);
4625 if (unlikely(!skb))
4626 return;
4627
4628 ieee80211_aggr_check(sdata, sta, skb);
4629
4630 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
4631 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
4632 if (tid_tx) {
4633 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
4634 /* fall back to non-offload slow path */
4635 __ieee80211_subif_start_xmit(skb, dev, info_flags: 0,
4636 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4637 NULL);
4638 return;
4639 }
4640
4641 if (tid_tx->timeout)
4642 tid_tx->last_tx = jiffies;
4643 }
4644
4645 skb = ieee80211_tx_skb_fixup(skb, features: ieee80211_sdata_netdev_features(sdata));
4646 if (!skb)
4647 return;
4648
4649 info = IEEE80211_SKB_CB(skb);
4650 memset(s: info, c: 0, n: sizeof(*info));
4651
4652 info->hw_queue = sdata->vif.hw_queue[queue];
4653
4654 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4655 sdata = container_of(sdata->bss,
4656 struct ieee80211_sub_if_data, u.ap);
4657
4658 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP;
4659 info->control.vif = &sdata->vif;
4660
4661 if (key)
4662 info->control.hw_key = &key->conf;
4663
4664 skb_list_walk_safe(skb, seg, next) {
4665 skbs++;
4666 len += seg->len;
4667 if (seg != skb)
4668 memcpy(to: IEEE80211_SKB_CB(skb: seg), from: info, len: sizeof(*info));
4669 }
4670
4671 if (unlikely(sk_requests_wifi_status(skb->sk))) {
4672 info->status_data = ieee80211_store_ack_skb(local, skb,
4673 info_flags: &info->flags, NULL);
4674 if (info->status_data)
4675 info->status_data_idr = 1;
4676 }
4677
4678 dev_sw_netstats_tx_add(dev, packets: skbs, len);
4679 sta->deflink.tx_stats.packets[queue] += skbs;
4680 sta->deflink.tx_stats.bytes[queue] += len;
4681
4682 ieee80211_tpt_led_trig_tx(local, bytes: len);
4683
4684 ieee80211_tx_8023(sdata, skb, sta, txpending: false);
4685
4686 return;
4687
4688out_free:
4689 kfree_skb(skb);
4690}
4691
4692netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
4693 struct net_device *dev)
4694{
4695 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4696 struct ethhdr *ehdr = (struct ethhdr *)skb->data;
4697 struct ieee80211_key *key;
4698 struct sta_info *sta;
4699
4700 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) {
4701 kfree_skb(skb);
4702 return NETDEV_TX_OK;
4703 }
4704
4705 rcu_read_lock();
4706
4707 if (ieee80211_lookup_ra_sta(sdata, skb, sta_out: &sta)) {
4708 kfree_skb(skb);
4709 goto out;
4710 }
4711
4712 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded ||
4713 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
4714 sdata->control_port_protocol == ehdr->h_proto))
4715 goto skip_offload;
4716
4717 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4718 if (!key)
4719 key = rcu_dereference(sdata->default_unicast_key);
4720
4721 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) ||
4722 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP))
4723 goto skip_offload;
4724
4725 sk_pacing_shift_update(sk: skb->sk, val: sdata->local->hw.tx_sk_pacing_shift);
4726 ieee80211_8023_xmit(sdata, dev, sta, key, skb);
4727 goto out;
4728
4729skip_offload:
4730 ieee80211_subif_start_xmit(skb, dev);
4731out:
4732 rcu_read_unlock();
4733
4734 return NETDEV_TX_OK;
4735}
4736
4737struct sk_buff *
4738ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
4739 struct sk_buff *skb, u32 info_flags)
4740{
4741 struct ieee80211_hdr *hdr;
4742 struct ieee80211_tx_data tx = {
4743 .local = sdata->local,
4744 .sdata = sdata,
4745 };
4746 struct sta_info *sta;
4747
4748 rcu_read_lock();
4749
4750 if (ieee80211_lookup_ra_sta(sdata, skb, sta_out: &sta)) {
4751 kfree_skb(skb);
4752 skb = ERR_PTR(error: -EINVAL);
4753 goto out;
4754 }
4755
4756 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta,
4757 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
4758 if (IS_ERR(ptr: skb))
4759 goto out;
4760
4761 hdr = (void *)skb->data;
4762 tx.sta = sta_info_get(sdata, addr: hdr->addr1);
4763 tx.skb = skb;
4764
4765 if (ieee80211_tx_h_select_key(tx: &tx) != TX_CONTINUE) {
4766 rcu_read_unlock();
4767 kfree_skb(skb);
4768 return ERR_PTR(error: -EINVAL);
4769 }
4770
4771out:
4772 rcu_read_unlock();
4773 return skb;
4774}
4775
4776/*
4777 * ieee80211_clear_tx_pending may not be called in a context where
4778 * it is possible that it packets could come in again.
4779 */
4780void ieee80211_clear_tx_pending(struct ieee80211_local *local)
4781{
4782 struct sk_buff *skb;
4783 int i;
4784
4785 for (i = 0; i < local->hw.queues; i++) {
4786 while ((skb = skb_dequeue(list: &local->pending[i])) != NULL)
4787 ieee80211_free_txskb(hw: &local->hw, skb);
4788 }
4789}
4790
4791/*
4792 * Returns false if the frame couldn't be transmitted but was queued instead,
4793 * which in this case means re-queued -- take as an indication to stop sending
4794 * more pending frames.
4795 */
4796static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
4797 struct sk_buff *skb)
4798{
4799 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4800 struct ieee80211_sub_if_data *sdata;
4801 struct sta_info *sta;
4802 struct ieee80211_hdr *hdr;
4803 bool result;
4804 struct ieee80211_chanctx_conf *chanctx_conf;
4805
4806 sdata = vif_to_sdata(p: info->control.vif);
4807
4808 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) {
4809 /* update band only for non-MLD */
4810 if (!ieee80211_vif_is_mld(vif: &sdata->vif)) {
4811 chanctx_conf =
4812 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
4813 if (unlikely(!chanctx_conf)) {
4814 dev_kfree_skb(skb);
4815 return true;
4816 }
4817 info->band = chanctx_conf->def.chan->band;
4818 }
4819 result = ieee80211_tx(sdata, NULL, skb, txpending: true);
4820 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
4821 if (ieee80211_lookup_ra_sta(sdata, skb, sta_out: &sta)) {
4822 dev_kfree_skb(skb);
4823 return true;
4824 }
4825
4826 if (IS_ERR(ptr: sta) || (sta && !sta->uploaded))
4827 sta = NULL;
4828
4829 result = ieee80211_tx_8023(sdata, skb, sta, txpending: true);
4830 } else {
4831 struct sk_buff_head skbs;
4832
4833 __skb_queue_head_init(list: &skbs);
4834 __skb_queue_tail(list: &skbs, newsk: skb);
4835
4836 hdr = (struct ieee80211_hdr *)skb->data;
4837 sta = sta_info_get(sdata, addr: hdr->addr1);
4838
4839 result = __ieee80211_tx(local, skbs: &skbs, sta, txpending: true);
4840 }
4841
4842 return result;
4843}
4844
4845/*
4846 * Transmit all pending packets. Called from tasklet.
4847 */
4848void ieee80211_tx_pending(struct tasklet_struct *t)
4849{
4850 struct ieee80211_local *local = from_tasklet(local, t,
4851 tx_pending_tasklet);
4852 unsigned long flags;
4853 int i;
4854 bool txok;
4855
4856 rcu_read_lock();
4857
4858 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4859 for (i = 0; i < local->hw.queues; i++) {
4860 /*
4861 * If queue is stopped by something other than due to pending
4862 * frames, or we have no pending frames, proceed to next queue.
4863 */
4864 if (local->queue_stop_reasons[i] ||
4865 skb_queue_empty(list: &local->pending[i]))
4866 continue;
4867
4868 while (!skb_queue_empty(list: &local->pending[i])) {
4869 struct sk_buff *skb = __skb_dequeue(list: &local->pending[i]);
4870 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4871
4872 if (WARN_ON(!info->control.vif)) {
4873 ieee80211_free_txskb(hw: &local->hw, skb);
4874 continue;
4875 }
4876
4877 spin_unlock_irqrestore(lock: &local->queue_stop_reason_lock,
4878 flags);
4879
4880 txok = ieee80211_tx_pending_skb(local, skb);
4881 spin_lock_irqsave(&local->queue_stop_reason_lock,
4882 flags);
4883 if (!txok)
4884 break;
4885 }
4886 }
4887 spin_unlock_irqrestore(lock: &local->queue_stop_reason_lock, flags);
4888
4889 rcu_read_unlock();
4890}
4891
4892/* functions for drivers to get certain frames */
4893
4894static void ieee80211_beacon_add_tim_pvb(struct ps_data *ps,
4895 struct sk_buff *skb,
4896 bool mcast_traffic)
4897{
4898 int i, n1 = 0, n2;
4899
4900 /*
4901 * Find largest even number N1 so that bits numbered 1 through
4902 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4903 * (N2 + 1) x 8 through 2007 are 0.
4904 */
4905 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4906 if (ps->tim[i]) {
4907 n1 = i & 0xfe;
4908 break;
4909 }
4910 }
4911 n2 = n1;
4912 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4913 if (ps->tim[i]) {
4914 n2 = i;
4915 break;
4916 }
4917 }
4918
4919 /* Bitmap control */
4920 skb_put_u8(skb, val: n1 | mcast_traffic);
4921 /* Part Virt Bitmap */
4922 skb_put_data(skb, data: ps->tim + n1, len: n2 - n1 + 1);
4923}
4924
4925/*
4926 * mac80211 currently supports encoding using block bitmap mode, non
4927 * inversed. The current implementation supports up to 1600 AIDs.
4928 *
4929 * Block bitmap encoding breaks down the AID bitmap into blocks of 64
4930 * AIDs. Each block contains between 0 and 8 subblocks. Each subblock
4931 * describes 8 AIDs and the presence of a subblock is determined by
4932 * the block bitmap.
4933 */
4934static void ieee80211_s1g_beacon_add_tim_pvb(struct ps_data *ps,
4935 struct sk_buff *skb,
4936 bool mcast_traffic)
4937{
4938 int blk;
4939
4940 /*
4941 * Emit a bitmap control block with a page slice number of 31 and a
4942 * page index of 0 which indicates as per IEEE80211-2024 9.4.2.5.1
4943 * that the entire page (2048 bits) indicated by the page index
4944 * is encoded in the partial virtual bitmap.
4945 */
4946 skb_put_u8(skb, val: mcast_traffic | (31 << 1));
4947
4948 /* Emit an encoded block for each non-zero sub-block */
4949 for (blk = 0; blk < IEEE80211_MAX_SUPPORTED_S1G_TIM_BLOCKS; blk++) {
4950 u8 blk_bmap = 0;
4951 int sblk;
4952
4953 for (sblk = 0; sblk < 8; sblk++) {
4954 int sblk_idx = blk * 8 + sblk;
4955
4956 /*
4957 * If the current subblock is non-zero, increase the
4958 * number of subblocks to emit for the current block.
4959 */
4960 if (ps->tim[sblk_idx])
4961 blk_bmap |= BIT(sblk);
4962 }
4963
4964 /* If the current block contains no non-zero sublocks */
4965 if (!blk_bmap)
4966 continue;
4967
4968 /*
4969 * Emit a block control byte for the current encoded block
4970 * with an encoding mode of block bitmap (0x0), not inverse
4971 * (0x0) and the current block offset (5 bits)
4972 */
4973 skb_put_u8(skb, val: blk << 3);
4974
4975 /*
4976 * Emit the block bitmap for the current encoded block which
4977 * contains the present subblocks.
4978 */
4979 skb_put_u8(skb, val: blk_bmap);
4980
4981 /* Emit the present subblocks */
4982 for (sblk = 0; sblk < 8; sblk++) {
4983 int sblk_idx = blk * 8 + sblk;
4984
4985 if (!(blk_bmap & BIT(sblk)))
4986 continue;
4987
4988 skb_put_u8(skb, val: ps->tim[sblk_idx]);
4989 }
4990 }
4991}
4992
4993static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4994 struct ieee80211_link_data *link,
4995 struct ps_data *ps, struct sk_buff *skb,
4996 bool is_template)
4997{
4998 struct element *tim;
4999 bool mcast_traffic = false, have_bits = false;
5000 struct ieee80211_bss_conf *link_conf = link->conf;
5001 bool s1g = ieee80211_get_link_sband(link)->band == NL80211_BAND_S1GHZ;
5002
5003 /* Generate bitmap for TIM only if there are any STAs in power save
5004 * mode. */
5005 if (atomic_read(v: &ps->num_sta_ps) > 0)
5006 /* in the hope that this is faster than
5007 * checking byte-for-byte */
5008 have_bits = !bitmap_empty(src: (unsigned long *)ps->tim,
5009 IEEE80211_MAX_AID + 1);
5010
5011 if (!is_template) {
5012 if (ps->dtim_count == 0)
5013 ps->dtim_count = link_conf->dtim_period - 1;
5014 else
5015 ps->dtim_count--;
5016 }
5017
5018 /* Length is set after parsing the AID bitmap */
5019 tim = skb_put(skb, len: sizeof(struct element));
5020 tim->id = WLAN_EID_TIM;
5021 skb_put_u8(skb, val: ps->dtim_count);
5022 skb_put_u8(skb, val: link_conf->dtim_period);
5023
5024 if (ps->dtim_count == 0 && !skb_queue_empty(list: &ps->bc_buf))
5025 mcast_traffic = true;
5026
5027 ps->dtim_bc_mc = mcast_traffic;
5028
5029 if (have_bits) {
5030 if (s1g)
5031 ieee80211_s1g_beacon_add_tim_pvb(ps, skb,
5032 mcast_traffic);
5033 else
5034 ieee80211_beacon_add_tim_pvb(ps, skb, mcast_traffic);
5035 } else {
5036 /*
5037 * If there is no buffered unicast traffic for an S1G
5038 * interface, we can exclude the bitmap control. This is in
5039 * contrast to other phy types as they do include the bitmap
5040 * control and pvb even when there is no buffered traffic.
5041 */
5042 if (!s1g) {
5043 /* Bitmap control */
5044 skb_put_u8(skb, val: mcast_traffic);
5045 /* Part Virt Bitmap */
5046 skb_put_u8(skb, val: 0);
5047 }
5048 }
5049
5050 tim->datalen = skb_tail_pointer(skb) - tim->data;
5051}
5052
5053static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
5054 struct ieee80211_link_data *link,
5055 struct ps_data *ps, struct sk_buff *skb,
5056 bool is_template)
5057{
5058 struct ieee80211_local *local = sdata->local;
5059
5060 /*
5061 * Not very nice, but we want to allow the driver to call
5062 * ieee80211_beacon_get() as a response to the set_tim()
5063 * callback. That, however, is already invoked under the
5064 * sta_lock to guarantee consistent and race-free update
5065 * of the tim bitmap in mac80211 and the driver.
5066 */
5067 if (local->tim_in_locked_section) {
5068 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template);
5069 } else {
5070 spin_lock_bh(lock: &local->tim_lock);
5071 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template);
5072 spin_unlock_bh(lock: &local->tim_lock);
5073 }
5074
5075 return 0;
5076}
5077
5078static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata,
5079 struct beacon_data *beacon,
5080 struct ieee80211_link_data *link)
5081{
5082 u8 *beacon_data, count, max_count = 1;
5083 struct probe_resp *resp;
5084 size_t beacon_data_len;
5085 u16 *bcn_offsets;
5086 int i;
5087
5088 switch (sdata->vif.type) {
5089 case NL80211_IFTYPE_AP:
5090 beacon_data = beacon->tail;
5091 beacon_data_len = beacon->tail_len;
5092 break;
5093 case NL80211_IFTYPE_ADHOC:
5094 beacon_data = beacon->head;
5095 beacon_data_len = beacon->head_len;
5096 break;
5097 case NL80211_IFTYPE_MESH_POINT:
5098 beacon_data = beacon->head;
5099 beacon_data_len = beacon->head_len;
5100 break;
5101 default:
5102 return;
5103 }
5104
5105 resp = rcu_dereference(link->u.ap.probe_resp);
5106
5107 bcn_offsets = beacon->cntdwn_counter_offsets;
5108 count = beacon->cntdwn_current_counter;
5109 if (link->conf->csa_active)
5110 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM;
5111
5112 for (i = 0; i < max_count; ++i) {
5113 if (bcn_offsets[i]) {
5114 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len))
5115 return;
5116 beacon_data[bcn_offsets[i]] = count;
5117 }
5118
5119 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) {
5120 u16 *resp_offsets = resp->cntdwn_counter_offsets;
5121
5122 resp->data[resp_offsets[i]] = count;
5123 }
5124 }
5125}
5126
5127static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link,
5128 struct beacon_data *beacon)
5129{
5130 if (beacon->cntdwn_current_counter == 1) {
5131 /*
5132 * Channel switch handling is done by a worker thread while
5133 * beacons get pulled from hardware timers. It's therefore
5134 * possible that software threads are slow enough to not be
5135 * able to complete CSA handling in a single beacon interval,
5136 * in which case we get here. There isn't much to do about
5137 * it, other than letting the user know that the AP isn't
5138 * behaving correctly.
5139 */
5140 link_err_once(link,
5141 "beacon TX faster than countdown (channel/color switch) completion\n");
5142 return 0;
5143 }
5144
5145 beacon->cntdwn_current_counter--;
5146
5147 return beacon->cntdwn_current_counter;
5148}
5149
5150u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id)
5151{
5152 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
5153 struct ieee80211_link_data *link;
5154 struct beacon_data *beacon = NULL;
5155 u8 count = 0;
5156
5157 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS))
5158 return 0;
5159
5160 rcu_read_lock();
5161
5162 link = rcu_dereference(sdata->link[link_id]);
5163 if (!link)
5164 goto unlock;
5165
5166 if (sdata->vif.type == NL80211_IFTYPE_AP)
5167 beacon = rcu_dereference(link->u.ap.beacon);
5168 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
5169 beacon = rcu_dereference(sdata->u.ibss.presp);
5170 else if (ieee80211_vif_is_mesh(vif: &sdata->vif))
5171 beacon = rcu_dereference(sdata->u.mesh.beacon);
5172
5173 if (!beacon)
5174 goto unlock;
5175
5176 count = __ieee80211_beacon_update_cntdwn(link, beacon);
5177
5178unlock:
5179 rcu_read_unlock();
5180 return count;
5181}
5182EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn);
5183
5184void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter)
5185{
5186 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
5187 struct beacon_data *beacon = NULL;
5188
5189 rcu_read_lock();
5190
5191 if (sdata->vif.type == NL80211_IFTYPE_AP)
5192 beacon = rcu_dereference(sdata->deflink.u.ap.beacon);
5193 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
5194 beacon = rcu_dereference(sdata->u.ibss.presp);
5195 else if (ieee80211_vif_is_mesh(vif: &sdata->vif))
5196 beacon = rcu_dereference(sdata->u.mesh.beacon);
5197
5198 if (!beacon)
5199 goto unlock;
5200
5201 if (counter < beacon->cntdwn_current_counter)
5202 beacon->cntdwn_current_counter = counter;
5203
5204unlock:
5205 rcu_read_unlock();
5206}
5207EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn);
5208
5209bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif,
5210 unsigned int link_id)
5211{
5212 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
5213 struct ieee80211_link_data *link;
5214 struct beacon_data *beacon = NULL;
5215 u8 *beacon_data;
5216 size_t beacon_data_len;
5217 int ret = false;
5218
5219 if (!ieee80211_sdata_running(sdata))
5220 return false;
5221
5222 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS))
5223 return 0;
5224
5225 rcu_read_lock();
5226
5227 link = rcu_dereference(sdata->link[link_id]);
5228 if (!link)
5229 goto out;
5230
5231 if (vif->type == NL80211_IFTYPE_AP) {
5232 beacon = rcu_dereference(link->u.ap.beacon);
5233 if (WARN_ON(!beacon || !beacon->tail))
5234 goto out;
5235 beacon_data = beacon->tail;
5236 beacon_data_len = beacon->tail_len;
5237 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
5238 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
5239
5240 beacon = rcu_dereference(ifibss->presp);
5241 if (!beacon)
5242 goto out;
5243
5244 beacon_data = beacon->head;
5245 beacon_data_len = beacon->head_len;
5246 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
5247 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
5248
5249 beacon = rcu_dereference(ifmsh->beacon);
5250 if (!beacon)
5251 goto out;
5252
5253 beacon_data = beacon->head;
5254 beacon_data_len = beacon->head_len;
5255 } else {
5256 WARN_ON(1);
5257 goto out;
5258 }
5259
5260 if (!beacon->cntdwn_counter_offsets[0])
5261 goto out;
5262
5263 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len))
5264 goto out;
5265
5266 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1)
5267 ret = true;
5268
5269 out:
5270 rcu_read_unlock();
5271
5272 return ret;
5273}
5274EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete);
5275
5276static int ieee80211_beacon_protect(struct sk_buff *skb,
5277 struct ieee80211_local *local,
5278 struct ieee80211_sub_if_data *sdata,
5279 struct ieee80211_link_data *link)
5280{
5281 ieee80211_tx_result res;
5282 struct ieee80211_tx_data tx;
5283 struct sk_buff *check_skb;
5284
5285 memset(s: &tx, c: 0, n: sizeof(tx));
5286 tx.key = rcu_dereference(link->default_beacon_key);
5287 if (!tx.key)
5288 return 0;
5289
5290 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) {
5291 tx.key = NULL;
5292 return -EINVAL;
5293 }
5294
5295 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
5296 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
5297 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf;
5298
5299 tx.local = local;
5300 tx.sdata = sdata;
5301 __skb_queue_head_init(list: &tx.skbs);
5302 __skb_queue_tail(list: &tx.skbs, newsk: skb);
5303 res = ieee80211_tx_h_encrypt(tx: &tx);
5304 check_skb = __skb_dequeue(list: &tx.skbs);
5305 /* we may crash after this, but it'd be a bug in crypto */
5306 WARN_ON(check_skb != skb);
5307 if (WARN_ON_ONCE(res != TX_CONTINUE))
5308 return -EINVAL;
5309
5310 return 0;
5311}
5312
5313static void
5314ieee80211_beacon_get_finish(struct ieee80211_hw *hw,
5315 struct ieee80211_vif *vif,
5316 struct ieee80211_link_data *link,
5317 struct ieee80211_mutable_offsets *offs,
5318 struct beacon_data *beacon,
5319 struct sk_buff *skb,
5320 struct ieee80211_chanctx_conf *chanctx_conf,
5321 u16 csa_off_base)
5322{
5323 struct ieee80211_local *local = hw_to_local(hw);
5324 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
5325 struct ieee80211_tx_info *info;
5326 enum nl80211_band band;
5327 struct ieee80211_tx_rate_control txrc;
5328
5329 /* CSA offsets */
5330 if (offs && beacon) {
5331 u16 i;
5332
5333 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) {
5334 u16 csa_off = beacon->cntdwn_counter_offsets[i];
5335
5336 if (!csa_off)
5337 continue;
5338
5339 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off;
5340 }
5341 }
5342
5343 band = chanctx_conf->def.chan->band;
5344 info = IEEE80211_SKB_CB(skb);
5345 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
5346 info->flags |= IEEE80211_TX_CTL_NO_ACK;
5347 info->band = band;
5348
5349 memset(s: &txrc, c: 0, n: sizeof(txrc));
5350 txrc.hw = hw;
5351 txrc.sband = local->hw.wiphy->bands[band];
5352 txrc.bss_conf = link->conf;
5353 txrc.skb = skb;
5354 txrc.reported_rate.idx = -1;
5355 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band])
5356 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band];
5357 else
5358 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
5359 txrc.bss = true;
5360 rate_control_get_rate(sdata, NULL, txrc: &txrc);
5361
5362 info->control.vif = vif;
5363 info->control.flags |= u32_encode_bits(v: link->link_id,
5364 field: IEEE80211_TX_CTRL_MLO_LINK);
5365 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
5366 IEEE80211_TX_CTL_ASSIGN_SEQ |
5367 IEEE80211_TX_CTL_FIRST_FRAGMENT;
5368}
5369
5370static void
5371ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon,
5372 u8 i)
5373{
5374 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt ||
5375 i > beacon->mbssid_ies->cnt)
5376 return;
5377
5378 if (i < beacon->mbssid_ies->cnt) {
5379 skb_put_data(skb, data: beacon->mbssid_ies->elem[i].data,
5380 len: beacon->mbssid_ies->elem[i].len);
5381
5382 if (beacon->rnr_ies && beacon->rnr_ies->cnt) {
5383 skb_put_data(skb, data: beacon->rnr_ies->elem[i].data,
5384 len: beacon->rnr_ies->elem[i].len);
5385
5386 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++)
5387 skb_put_data(skb, data: beacon->rnr_ies->elem[i].data,
5388 len: beacon->rnr_ies->elem[i].len);
5389 }
5390 return;
5391 }
5392
5393 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */
5394 for (i = 0; i < beacon->mbssid_ies->cnt; i++)
5395 skb_put_data(skb, data: beacon->mbssid_ies->elem[i].data,
5396 len: beacon->mbssid_ies->elem[i].len);
5397}
5398
5399static struct sk_buff *
5400__ieee80211_beacon_get_ap(struct ieee80211_hw *hw,
5401 struct ieee80211_vif *vif,
5402 struct ieee80211_link_data *link,
5403 struct ieee80211_mutable_offsets *offs,
5404 bool is_template,
5405 struct beacon_data *beacon,
5406 struct ieee80211_chanctx_conf *chanctx_conf,
5407 u8 ema_index)
5408{
5409 struct ieee80211_local *local = hw_to_local(hw);
5410 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
5411 struct ieee80211_if_ap *ap = &sdata->u.ap;
5412 struct sk_buff *skb = NULL;
5413 u16 csa_off_base = 0;
5414 int mbssid_len;
5415
5416 if (beacon->cntdwn_counter_offsets[0]) {
5417 if (!is_template)
5418 ieee80211_beacon_update_cntdwn(vif, link->link_id);
5419
5420 ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5421 }
5422
5423 /* headroom, head length,
5424 * tail length, maximum TIM length and multiple BSSID length
5425 */
5426 mbssid_len = ieee80211_get_mbssid_beacon_len(elems: beacon->mbssid_ies,
5427 rnr_elems: beacon->rnr_ies,
5428 i: ema_index);
5429
5430 skb = dev_alloc_skb(length: local->tx_headroom + beacon->head_len +
5431 beacon->tail_len + 256 +
5432 local->hw.extra_beacon_tailroom + mbssid_len);
5433 if (!skb)
5434 return NULL;
5435
5436 skb_reserve(skb, len: local->tx_headroom);
5437 skb_put_data(skb, data: beacon->head, len: beacon->head_len);
5438
5439 ieee80211_beacon_add_tim(sdata, link, ps: &ap->ps, skb, is_template);
5440
5441 if (offs) {
5442 offs->tim_offset = beacon->head_len;
5443 offs->tim_length = skb->len - beacon->head_len;
5444 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0];
5445
5446 if (mbssid_len) {
5447 ieee80211_beacon_add_mbssid(skb, beacon, i: ema_index);
5448 offs->mbssid_off = skb->len - mbssid_len;
5449 }
5450
5451 /* for AP the csa offsets are from tail */
5452 csa_off_base = skb->len;
5453 }
5454
5455 if (beacon->tail)
5456 skb_put_data(skb, data: beacon->tail, len: beacon->tail_len);
5457
5458 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) {
5459 dev_kfree_skb(skb);
5460 return NULL;
5461 }
5462
5463 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5464 chanctx_conf, csa_off_base);
5465 return skb;
5466}
5467
5468static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata,
5469 struct ieee80211_link_data *link)
5470{
5471 struct ps_data *ps = &sdata->u.ap.ps;
5472
5473 if (ps->sb_count == 0)
5474 ps->sb_count = link->conf->s1g_long_beacon_period - 1;
5475 else
5476 ps->sb_count--;
5477
5478 return ps->sb_count == 0;
5479}
5480
5481static struct sk_buff *
5482ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw,
5483 struct ieee80211_vif *vif,
5484 struct ieee80211_link_data *link,
5485 struct ieee80211_chanctx_conf *chanctx_conf,
5486 struct s1g_short_beacon_data *sb,
5487 bool is_template)
5488{
5489 struct ieee80211_local *local = hw_to_local(hw);
5490 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
5491 struct ieee80211_if_ap *ap = &sdata->u.ap;
5492 struct sk_buff *skb;
5493
5494 skb = dev_alloc_skb(length: local->tx_headroom + sb->short_head_len +
5495 sb->short_tail_len + 256 +
5496 local->hw.extra_beacon_tailroom);
5497 if (!skb)
5498 return NULL;
5499
5500 skb_reserve(skb, len: local->tx_headroom);
5501 skb_put_data(skb, data: sb->short_head, len: sb->short_head_len);
5502
5503 ieee80211_beacon_add_tim(sdata, link, ps: &ap->ps, skb, is_template);
5504
5505 if (sb->short_tail)
5506 skb_put_data(skb, data: sb->short_tail, len: sb->short_tail_len);
5507
5508 ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb,
5509 chanctx_conf, csa_off_base: 0);
5510 return skb;
5511}
5512
5513static struct sk_buff *
5514ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5515 struct ieee80211_link_data *link,
5516 struct ieee80211_mutable_offsets *offs,
5517 bool is_template, struct beacon_data *beacon,
5518 struct ieee80211_chanctx_conf *chanctx_conf,
5519 u8 ema_index, struct s1g_short_beacon_data *s1g_sb)
5520{
5521 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
5522
5523 if (!sdata->vif.cfg.s1g || !s1g_sb ||
5524 ieee80211_s1g_need_long_beacon(sdata, link))
5525 return __ieee80211_beacon_get_ap(hw, vif, link, offs,
5526 is_template, beacon,
5527 chanctx_conf, ema_index);
5528
5529 return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf,
5530 sb: s1g_sb, is_template);
5531}
5532
5533static struct ieee80211_ema_beacons *
5534ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw,
5535 struct ieee80211_vif *vif,
5536 struct ieee80211_link_data *link,
5537 struct ieee80211_mutable_offsets *offs,
5538 bool is_template, struct beacon_data *beacon,
5539 struct ieee80211_chanctx_conf *chanctx_conf)
5540{
5541 struct ieee80211_ema_beacons *ema = NULL;
5542
5543 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt)
5544 return NULL;
5545
5546 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt),
5547 GFP_ATOMIC);
5548 if (!ema)
5549 return NULL;
5550
5551 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) {
5552 ema->bcn[ema->cnt].skb =
5553 ieee80211_beacon_get_ap(hw, vif, link,
5554 offs: &ema->bcn[ema->cnt].offs,
5555 is_template, beacon,
5556 chanctx_conf, ema_index: ema->cnt, NULL);
5557 if (!ema->bcn[ema->cnt].skb)
5558 break;
5559 }
5560
5561 if (ema->cnt == beacon->mbssid_ies->cnt)
5562 return ema;
5563
5564 ieee80211_beacon_free_ema_list(ema_beacons: ema);
5565 return NULL;
5566}
5567
5568#define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1
5569
5570static struct sk_buff *
5571__ieee80211_beacon_get(struct ieee80211_hw *hw,
5572 struct ieee80211_vif *vif,
5573 struct ieee80211_mutable_offsets *offs,
5574 bool is_template,
5575 unsigned int link_id,
5576 int ema_index,
5577 struct ieee80211_ema_beacons **ema_beacons)
5578{
5579 struct ieee80211_local *local = hw_to_local(hw);
5580 struct beacon_data *beacon = NULL;
5581 struct sk_buff *skb = NULL;
5582 struct ieee80211_sub_if_data *sdata = NULL;
5583 struct ieee80211_chanctx_conf *chanctx_conf;
5584 struct ieee80211_link_data *link;
5585 struct s1g_short_beacon_data *s1g_short_bcn = NULL;
5586
5587 rcu_read_lock();
5588
5589 sdata = vif_to_sdata(p: vif);
5590 link = rcu_dereference(sdata->link[link_id]);
5591 if (!link)
5592 goto out;
5593 chanctx_conf =
5594 rcu_dereference(link->conf->chanctx_conf);
5595
5596 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
5597 goto out;
5598
5599 if (offs)
5600 memset(s: offs, c: 0, n: sizeof(*offs));
5601
5602 if (sdata->vif.type == NL80211_IFTYPE_AP) {
5603 beacon = rcu_dereference(link->u.ap.beacon);
5604 if (!beacon)
5605 goto out;
5606
5607 if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) {
5608 s1g_short_bcn =
5609 rcu_dereference(link->u.ap.s1g_short_beacon);
5610 if (!s1g_short_bcn)
5611 goto out;
5612 }
5613
5614 if (ema_beacons) {
5615 *ema_beacons =
5616 ieee80211_beacon_get_ap_ema_list(hw, vif, link,
5617 offs,
5618 is_template,
5619 beacon,
5620 chanctx_conf);
5621 } else {
5622 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) {
5623 if (ema_index >= beacon->mbssid_ies->cnt)
5624 goto out; /* End of MBSSID elements */
5625
5626 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS)
5627 ema_index = beacon->mbssid_ies->cnt;
5628 } else {
5629 ema_index = 0;
5630 }
5631
5632 skb = ieee80211_beacon_get_ap(hw, vif, link, offs,
5633 is_template, beacon,
5634 chanctx_conf, ema_index,
5635 s1g_sb: s1g_short_bcn);
5636 }
5637 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
5638 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
5639 struct ieee80211_hdr *hdr;
5640
5641 beacon = rcu_dereference(ifibss->presp);
5642 if (!beacon)
5643 goto out;
5644
5645 if (beacon->cntdwn_counter_offsets[0]) {
5646 if (!is_template)
5647 __ieee80211_beacon_update_cntdwn(link, beacon);
5648
5649 ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5650 }
5651
5652 skb = dev_alloc_skb(length: local->tx_headroom + beacon->head_len +
5653 local->hw.extra_beacon_tailroom);
5654 if (!skb)
5655 goto out;
5656 skb_reserve(skb, len: local->tx_headroom);
5657 skb_put_data(skb, data: beacon->head, len: beacon->head_len);
5658
5659 hdr = (struct ieee80211_hdr *) skb->data;
5660 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
5661 IEEE80211_STYPE_BEACON);
5662
5663 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5664 chanctx_conf, csa_off_base: 0);
5665 } else if (ieee80211_vif_is_mesh(vif: &sdata->vif)) {
5666 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
5667
5668 beacon = rcu_dereference(ifmsh->beacon);
5669 if (!beacon)
5670 goto out;
5671
5672 if (beacon->cntdwn_counter_offsets[0]) {
5673 if (!is_template)
5674 /* TODO: For mesh csa_counter is in TU, so
5675 * decrementing it by one isn't correct, but
5676 * for now we leave it consistent with overall
5677 * mac80211's behavior.
5678 */
5679 __ieee80211_beacon_update_cntdwn(link, beacon);
5680
5681 ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5682 }
5683
5684 if (ifmsh->sync_ops)
5685 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
5686
5687 skb = dev_alloc_skb(length: local->tx_headroom +
5688 beacon->head_len +
5689 256 + /* TIM IE */
5690 beacon->tail_len +
5691 local->hw.extra_beacon_tailroom);
5692 if (!skb)
5693 goto out;
5694 skb_reserve(skb, len: local->tx_headroom);
5695 skb_put_data(skb, data: beacon->head, len: beacon->head_len);
5696 ieee80211_beacon_add_tim(sdata, link, ps: &ifmsh->ps, skb,
5697 is_template);
5698
5699 if (offs) {
5700 offs->tim_offset = beacon->head_len;
5701 offs->tim_length = skb->len - beacon->head_len;
5702 }
5703
5704 skb_put_data(skb, data: beacon->tail, len: beacon->tail_len);
5705 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5706 chanctx_conf, csa_off_base: 0);
5707 } else {
5708 WARN_ON(1);
5709 goto out;
5710 }
5711
5712 out:
5713 rcu_read_unlock();
5714 return skb;
5715
5716}
5717
5718struct sk_buff *
5719ieee80211_beacon_get_template(struct ieee80211_hw *hw,
5720 struct ieee80211_vif *vif,
5721 struct ieee80211_mutable_offsets *offs,
5722 unsigned int link_id)
5723{
5724 return __ieee80211_beacon_get(hw, vif, offs, is_template: true, link_id,
5725 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL);
5726}
5727EXPORT_SYMBOL(ieee80211_beacon_get_template);
5728
5729struct sk_buff *
5730ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw,
5731 struct ieee80211_vif *vif,
5732 struct ieee80211_mutable_offsets *offs,
5733 unsigned int link_id, u8 ema_index)
5734{
5735 return __ieee80211_beacon_get(hw, vif, offs, is_template: true, link_id, ema_index,
5736 NULL);
5737}
5738EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index);
5739
5740void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons)
5741{
5742 u8 i;
5743
5744 if (!ema_beacons)
5745 return;
5746
5747 for (i = 0; i < ema_beacons->cnt; i++)
5748 kfree_skb(skb: ema_beacons->bcn[i].skb);
5749
5750 kfree(objp: ema_beacons);
5751}
5752EXPORT_SYMBOL(ieee80211_beacon_free_ema_list);
5753
5754struct ieee80211_ema_beacons *
5755ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw,
5756 struct ieee80211_vif *vif,
5757 unsigned int link_id)
5758{
5759 struct ieee80211_ema_beacons *ema_beacons = NULL;
5760
5761 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0,
5762 &ema_beacons));
5763
5764 return ema_beacons;
5765}
5766EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list);
5767
5768struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
5769 struct ieee80211_vif *vif,
5770 u16 *tim_offset, u16 *tim_length,
5771 unsigned int link_id)
5772{
5773 struct ieee80211_mutable_offsets offs = {};
5774 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, offs: &offs, is_template: false,
5775 link_id,
5776 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS,
5777 NULL);
5778 struct sk_buff *copy;
5779
5780 if (!bcn)
5781 return bcn;
5782
5783 if (tim_offset)
5784 *tim_offset = offs.tim_offset;
5785
5786 if (tim_length)
5787 *tim_length = offs.tim_length;
5788
5789 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
5790 !hw_to_local(hw)->monitors)
5791 return bcn;
5792
5793 /* send a copy to monitor interfaces */
5794 copy = skb_copy(skb: bcn, GFP_ATOMIC);
5795 if (!copy)
5796 return bcn;
5797
5798 ieee80211_tx_monitor(local: hw_to_local(hw), skb: copy, retry_count: 1, NULL);
5799
5800 return bcn;
5801}
5802EXPORT_SYMBOL(ieee80211_beacon_get_tim);
5803
5804struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
5805 struct ieee80211_vif *vif)
5806{
5807 struct sk_buff *skb = NULL;
5808 struct probe_resp *presp = NULL;
5809 struct ieee80211_hdr *hdr;
5810 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
5811
5812 if (sdata->vif.type != NL80211_IFTYPE_AP)
5813 return NULL;
5814
5815 rcu_read_lock();
5816 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp);
5817 if (!presp)
5818 goto out;
5819
5820 skb = dev_alloc_skb(length: presp->len);
5821 if (!skb)
5822 goto out;
5823
5824 skb_put_data(skb, data: presp->data, len: presp->len);
5825
5826 hdr = (struct ieee80211_hdr *) skb->data;
5827 memset(s: hdr->addr1, c: 0, n: sizeof(hdr->addr1));
5828
5829out:
5830 rcu_read_unlock();
5831 return skb;
5832}
5833EXPORT_SYMBOL(ieee80211_proberesp_get);
5834
5835struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw,
5836 struct ieee80211_vif *vif)
5837{
5838 struct sk_buff *skb = NULL;
5839 struct fils_discovery_data *tmpl = NULL;
5840 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
5841
5842 if (sdata->vif.type != NL80211_IFTYPE_AP)
5843 return NULL;
5844
5845 rcu_read_lock();
5846 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery);
5847 if (!tmpl) {
5848 rcu_read_unlock();
5849 return NULL;
5850 }
5851
5852 skb = dev_alloc_skb(length: sdata->local->hw.extra_tx_headroom + tmpl->len);
5853 if (skb) {
5854 skb_reserve(skb, len: sdata->local->hw.extra_tx_headroom);
5855 skb_put_data(skb, data: tmpl->data, len: tmpl->len);
5856 }
5857
5858 rcu_read_unlock();
5859 return skb;
5860}
5861EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl);
5862
5863struct sk_buff *
5864ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw,
5865 struct ieee80211_vif *vif)
5866{
5867 struct sk_buff *skb = NULL;
5868 struct unsol_bcast_probe_resp_data *tmpl = NULL;
5869 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
5870
5871 if (sdata->vif.type != NL80211_IFTYPE_AP)
5872 return NULL;
5873
5874 rcu_read_lock();
5875 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp);
5876 if (!tmpl) {
5877 rcu_read_unlock();
5878 return NULL;
5879 }
5880
5881 skb = dev_alloc_skb(length: sdata->local->hw.extra_tx_headroom + tmpl->len);
5882 if (skb) {
5883 skb_reserve(skb, len: sdata->local->hw.extra_tx_headroom);
5884 skb_put_data(skb, data: tmpl->data, len: tmpl->len);
5885 }
5886
5887 rcu_read_unlock();
5888 return skb;
5889}
5890EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl);
5891
5892struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
5893 struct ieee80211_vif *vif)
5894{
5895 struct ieee80211_sub_if_data *sdata;
5896 struct ieee80211_pspoll *pspoll;
5897 struct ieee80211_local *local;
5898 struct sk_buff *skb;
5899
5900 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
5901 return NULL;
5902
5903 sdata = vif_to_sdata(p: vif);
5904 local = sdata->local;
5905
5906 skb = dev_alloc_skb(length: local->hw.extra_tx_headroom + sizeof(*pspoll));
5907 if (!skb)
5908 return NULL;
5909
5910 skb_reserve(skb, len: local->hw.extra_tx_headroom);
5911
5912 pspoll = skb_put_zero(skb, len: sizeof(*pspoll));
5913 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
5914 IEEE80211_STYPE_PSPOLL);
5915 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid);
5916
5917 /* aid in PS-Poll has its two MSBs each set to 1 */
5918 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
5919
5920 memcpy(to: pspoll->bssid, from: sdata->deflink.u.mgd.bssid, ETH_ALEN);
5921 memcpy(to: pspoll->ta, from: vif->addr, ETH_ALEN);
5922
5923 return skb;
5924}
5925EXPORT_SYMBOL(ieee80211_pspoll_get);
5926
5927struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
5928 struct ieee80211_vif *vif,
5929 int link_id, bool qos_ok)
5930{
5931 struct ieee80211_sub_if_data *sdata = vif_to_sdata(p: vif);
5932 struct ieee80211_local *local = sdata->local;
5933 struct ieee80211_link_data *link = NULL;
5934 struct ieee80211_hdr_3addr *nullfunc;
5935 struct sk_buff *skb;
5936 bool qos = false;
5937
5938 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
5939 return NULL;
5940
5941 skb = dev_alloc_skb(length: local->hw.extra_tx_headroom +
5942 sizeof(*nullfunc) + 2);
5943 if (!skb)
5944 return NULL;
5945
5946 rcu_read_lock();
5947 if (qos_ok) {
5948 struct sta_info *sta;
5949
5950 sta = sta_info_get(sdata, addr: vif->cfg.ap_addr);
5951 qos = sta && sta->sta.wme;
5952 }
5953
5954 if (link_id >= 0) {
5955 link = rcu_dereference(sdata->link[link_id]);
5956 if (WARN_ON_ONCE(!link)) {
5957 rcu_read_unlock();
5958 kfree_skb(skb);
5959 return NULL;
5960 }
5961 }
5962
5963 skb_reserve(skb, len: local->hw.extra_tx_headroom);
5964
5965 nullfunc = skb_put_zero(skb, len: sizeof(*nullfunc));
5966 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
5967 IEEE80211_STYPE_NULLFUNC |
5968 IEEE80211_FCTL_TODS);
5969 if (qos) {
5970 __le16 qoshdr = cpu_to_le16(7);
5971
5972 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
5973 IEEE80211_STYPE_NULLFUNC) !=
5974 IEEE80211_STYPE_QOS_NULLFUNC);
5975 nullfunc->frame_control |=
5976 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
5977 skb->priority = 7;
5978 skb_set_queue_mapping(skb, queue_mapping: IEEE80211_AC_VO);
5979 skb_put_data(skb, data: &qoshdr, len: sizeof(qoshdr));
5980 }
5981
5982 if (link) {
5983 memcpy(to: nullfunc->addr1, from: link->conf->bssid, ETH_ALEN);
5984 memcpy(to: nullfunc->addr2, from: link->conf->addr, ETH_ALEN);
5985 memcpy(to: nullfunc->addr3, from: link->conf->bssid, ETH_ALEN);
5986 } else {
5987 memcpy(to: nullfunc->addr1, from: vif->cfg.ap_addr, ETH_ALEN);
5988 memcpy(to: nullfunc->addr2, from: vif->addr, ETH_ALEN);
5989 memcpy(to: nullfunc->addr3, from: vif->cfg.ap_addr, ETH_ALEN);
5990 }
5991 rcu_read_unlock();
5992
5993 return skb;
5994}
5995EXPORT_SYMBOL(ieee80211_nullfunc_get);
5996
5997struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
5998 const u8 *src_addr,
5999 const u8 *ssid, size_t ssid_len,
6000 size_t tailroom)
6001{
6002 struct ieee80211_local *local = hw_to_local(hw);
6003 struct ieee80211_hdr_3addr *hdr;
6004 struct sk_buff *skb;
6005 size_t ie_ssid_len;
6006 u8 *pos;
6007
6008 ie_ssid_len = 2 + ssid_len;
6009
6010 skb = dev_alloc_skb(length: local->hw.extra_tx_headroom + sizeof(*hdr) +
6011 ie_ssid_len + tailroom);
6012 if (!skb)
6013 return NULL;
6014
6015 skb_reserve(skb, len: local->hw.extra_tx_headroom);
6016
6017 hdr = skb_put_zero(skb, len: sizeof(*hdr));
6018 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
6019 IEEE80211_STYPE_PROBE_REQ);
6020 eth_broadcast_addr(addr: hdr->addr1);
6021 memcpy(to: hdr->addr2, from: src_addr, ETH_ALEN);
6022 eth_broadcast_addr(addr: hdr->addr3);
6023
6024 pos = skb_put(skb, len: ie_ssid_len);
6025 *pos++ = WLAN_EID_SSID;
6026 *pos++ = ssid_len;
6027 if (ssid_len)
6028 memcpy(to: pos, from: ssid, len: ssid_len);
6029 pos += ssid_len;
6030
6031 return skb;
6032}
6033EXPORT_SYMBOL(ieee80211_probereq_get);
6034
6035void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
6036 const void *frame, size_t frame_len,
6037 const struct ieee80211_tx_info *frame_txctl,
6038 struct ieee80211_rts *rts)
6039{
6040 const struct ieee80211_hdr *hdr = frame;
6041
6042 rts->frame_control =
6043 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
6044 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
6045 frame_txctl);
6046 memcpy(to: rts->ra, from: hdr->addr1, len: sizeof(rts->ra));
6047 memcpy(to: rts->ta, from: hdr->addr2, len: sizeof(rts->ta));
6048}
6049EXPORT_SYMBOL(ieee80211_rts_get);
6050
6051void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
6052 const void *frame, size_t frame_len,
6053 const struct ieee80211_tx_info *frame_txctl,
6054 struct ieee80211_cts *cts)
6055{
6056 const struct ieee80211_hdr *hdr = frame;
6057
6058 cts->frame_control =
6059 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
6060 cts->duration = ieee80211_ctstoself_duration(hw, vif,
6061 frame_len, frame_txctl);
6062 memcpy(to: cts->ra, from: hdr->addr1, len: sizeof(cts->ra));
6063}
6064EXPORT_SYMBOL(ieee80211_ctstoself_get);
6065
6066struct sk_buff *
6067ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
6068 struct ieee80211_vif *vif)
6069{
6070 struct ieee80211_local *local = hw_to_local(hw);
6071 struct sk_buff *skb = NULL;
6072 struct ieee80211_tx_data tx;
6073 struct ieee80211_sub_if_data *sdata;
6074 struct ps_data *ps;
6075 struct ieee80211_tx_info *info;
6076 struct ieee80211_chanctx_conf *chanctx_conf;
6077
6078 sdata = vif_to_sdata(p: vif);
6079
6080 rcu_read_lock();
6081 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
6082
6083 if (!chanctx_conf)
6084 goto out;
6085
6086 if (sdata->vif.type == NL80211_IFTYPE_AP) {
6087 struct beacon_data *beacon =
6088 rcu_dereference(sdata->deflink.u.ap.beacon);
6089
6090 if (!beacon || !beacon->head)
6091 goto out;
6092
6093 ps = &sdata->u.ap.ps;
6094 } else if (ieee80211_vif_is_mesh(vif: &sdata->vif)) {
6095 ps = &sdata->u.mesh.ps;
6096 } else {
6097 goto out;
6098 }
6099
6100 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
6101 goto out; /* send buffered bc/mc only after DTIM beacon */
6102
6103 while (1) {
6104 skb = skb_dequeue(list: &ps->bc_buf);
6105 if (!skb)
6106 goto out;
6107 local->total_ps_buffered--;
6108
6109 if (!skb_queue_empty(list: &ps->bc_buf) && skb->len >= 2) {
6110 struct ieee80211_hdr *hdr =
6111 (struct ieee80211_hdr *) skb->data;
6112 /* more buffered multicast/broadcast frames ==> set
6113 * MoreData flag in IEEE 802.11 header to inform PS
6114 * STAs */
6115 hdr->frame_control |=
6116 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
6117 }
6118
6119 if (sdata->vif.type == NL80211_IFTYPE_AP)
6120 sdata = IEEE80211_DEV_TO_SUB_IF(dev: skb->dev);
6121 if (!ieee80211_tx_prepare(sdata, tx: &tx, NULL, skb))
6122 break;
6123 ieee80211_free_txskb(hw, skb);
6124 }
6125
6126 info = IEEE80211_SKB_CB(skb);
6127
6128 tx.flags |= IEEE80211_TX_PS_BUFFERED;
6129 info->band = chanctx_conf->def.chan->band;
6130
6131 if (invoke_tx_handlers(tx: &tx))
6132 skb = NULL;
6133 out:
6134 rcu_read_unlock();
6135
6136 return skb;
6137}
6138EXPORT_SYMBOL(ieee80211_get_buffered_bc);
6139
6140int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
6141{
6142 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
6143 struct ieee80211_sub_if_data *sdata = sta->sdata;
6144 struct ieee80211_local *local = sdata->local;
6145 int ret;
6146 u32 queues;
6147
6148 lockdep_assert_wiphy(local->hw.wiphy);
6149
6150 /* only some cases are supported right now */
6151 switch (sdata->vif.type) {
6152 case NL80211_IFTYPE_STATION:
6153 case NL80211_IFTYPE_AP:
6154 case NL80211_IFTYPE_AP_VLAN:
6155 break;
6156 default:
6157 WARN_ON(1);
6158 return -EINVAL;
6159 }
6160
6161 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
6162 return -EINVAL;
6163
6164 if (sta->reserved_tid == tid) {
6165 ret = 0;
6166 goto out;
6167 }
6168
6169 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
6170 sdata_err(sdata, "TID reservation already active\n");
6171 ret = -EALREADY;
6172 goto out;
6173 }
6174
6175 ieee80211_stop_vif_queues(local: sdata->local, sdata,
6176 reason: IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
6177
6178 synchronize_net();
6179
6180 /* Tear down BA sessions so we stop aggregating on this TID */
6181 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
6182 set_sta_flag(sta, flag: WLAN_STA_BLOCK_BA);
6183 __ieee80211_stop_tx_ba_session(sta, tid,
6184 reason: AGG_STOP_LOCAL_REQUEST);
6185 }
6186
6187 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
6188 __ieee80211_flush_queues(local, sdata, queues, drop: false);
6189
6190 sta->reserved_tid = tid;
6191
6192 ieee80211_wake_vif_queues(local, sdata,
6193 reason: IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
6194
6195 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
6196 clear_sta_flag(sta, flag: WLAN_STA_BLOCK_BA);
6197
6198 ret = 0;
6199 out:
6200 return ret;
6201}
6202EXPORT_SYMBOL(ieee80211_reserve_tid);
6203
6204void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
6205{
6206 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
6207 struct ieee80211_sub_if_data *sdata = sta->sdata;
6208
6209 lockdep_assert_wiphy(sdata->local->hw.wiphy);
6210
6211 /* only some cases are supported right now */
6212 switch (sdata->vif.type) {
6213 case NL80211_IFTYPE_STATION:
6214 case NL80211_IFTYPE_AP:
6215 case NL80211_IFTYPE_AP_VLAN:
6216 break;
6217 default:
6218 WARN_ON(1);
6219 return;
6220 }
6221
6222 if (tid != sta->reserved_tid) {
6223 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
6224 return;
6225 }
6226
6227 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
6228}
6229EXPORT_SYMBOL(ieee80211_unreserve_tid);
6230
6231void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
6232 struct sk_buff *skb, int tid, int link_id,
6233 enum nl80211_band band)
6234{
6235 const struct ieee80211_hdr *hdr = (void *)skb->data;
6236 int ac = ieee80211_ac_from_tid(tid);
6237 unsigned int link;
6238
6239 skb_reset_mac_header(skb);
6240 skb_set_queue_mapping(skb, queue_mapping: ac);
6241 skb->priority = tid;
6242
6243 skb->dev = sdata->dev;
6244
6245 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS);
6246 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK,
6247 IEEE80211_LINK_UNSPECIFIED));
6248
6249 if (!ieee80211_vif_is_mld(vif: &sdata->vif)) {
6250 link = 0;
6251 } else if (link_id >= 0) {
6252 link = link_id;
6253 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) {
6254 /* address from the MLD */
6255 link = IEEE80211_LINK_UNSPECIFIED;
6256 } else {
6257 /* otherwise must be addressed from a link */
6258 rcu_read_lock();
6259 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) {
6260 struct ieee80211_bss_conf *link_conf;
6261
6262 link_conf = rcu_dereference(sdata->vif.link_conf[link]);
6263 if (!link_conf)
6264 continue;
6265 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0)
6266 break;
6267 }
6268 rcu_read_unlock();
6269
6270 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf)))
6271 link = ffs(sdata->vif.active_links) - 1;
6272 }
6273
6274 IEEE80211_SKB_CB(skb)->control.flags |=
6275 u32_encode_bits(v: link, field: IEEE80211_TX_CTRL_MLO_LINK);
6276
6277 /*
6278 * The other path calling ieee80211_xmit is from the tasklet,
6279 * and while we can handle concurrent transmissions locking
6280 * requirements are that we do not come into tx with bhs on.
6281 */
6282 local_bh_disable();
6283 IEEE80211_SKB_CB(skb)->band = band;
6284 ieee80211_xmit(sdata, NULL, skb);
6285 local_bh_enable();
6286}
6287
6288void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
6289 struct sk_buff *skb, int tid, int link_id)
6290{
6291 struct ieee80211_chanctx_conf *chanctx_conf;
6292 enum nl80211_band band;
6293
6294 rcu_read_lock();
6295 if (sdata->vif.type == NL80211_IFTYPE_NAN) {
6296 band = NUM_NL80211_BANDS;
6297 } else if (!ieee80211_vif_is_mld(vif: &sdata->vif)) {
6298 WARN_ON(link_id >= 0);
6299 chanctx_conf =
6300 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
6301 if (WARN_ON(!chanctx_conf)) {
6302 rcu_read_unlock();
6303 kfree_skb(skb);
6304 return;
6305 }
6306 band = chanctx_conf->def.chan->band;
6307 } else {
6308 WARN_ON(link_id >= 0 &&
6309 !(sdata->vif.active_links & BIT(link_id)));
6310 /* MLD transmissions must not rely on the band */
6311 band = 0;
6312 }
6313
6314 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band);
6315 rcu_read_unlock();
6316}
6317
6318int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
6319 const u8 *buf, size_t len,
6320 const u8 *dest, __be16 proto, bool unencrypted,
6321 int link_id, u64 *cookie)
6322{
6323 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
6324 struct ieee80211_local *local = sdata->local;
6325 struct sta_info *sta;
6326 struct sk_buff *skb;
6327 struct ethhdr *ehdr;
6328 u32 ctrl_flags = 0;
6329 u32 flags = 0;
6330 int err;
6331
6332 /* mutex lock is only needed for incrementing the cookie counter */
6333 lockdep_assert_wiphy(local->hw.wiphy);
6334
6335 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
6336 * or Pre-Authentication
6337 */
6338 if (proto != sdata->control_port_protocol &&
6339 proto != cpu_to_be16(ETH_P_PREAUTH))
6340 return -EINVAL;
6341
6342 if (proto == sdata->control_port_protocol)
6343 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO |
6344 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
6345
6346 if (unencrypted)
6347 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
6348
6349 if (cookie)
6350 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
6351
6352 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX;
6353
6354 skb = dev_alloc_skb(length: local->hw.extra_tx_headroom +
6355 sizeof(struct ethhdr) + len);
6356 if (!skb)
6357 return -ENOMEM;
6358
6359 skb_reserve(skb, len: local->hw.extra_tx_headroom + sizeof(struct ethhdr));
6360
6361 skb_put_data(skb, data: buf, len);
6362
6363 ehdr = skb_push(skb, len: sizeof(struct ethhdr));
6364 memcpy(to: ehdr->h_dest, from: dest, ETH_ALEN);
6365
6366 /* we may override the SA for MLO STA later */
6367 if (link_id < 0) {
6368 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED,
6369 field: IEEE80211_TX_CTRL_MLO_LINK);
6370 memcpy(to: ehdr->h_source, from: sdata->vif.addr, ETH_ALEN);
6371 } else {
6372 struct ieee80211_bss_conf *link_conf;
6373
6374 ctrl_flags |= u32_encode_bits(v: link_id,
6375 field: IEEE80211_TX_CTRL_MLO_LINK);
6376
6377 rcu_read_lock();
6378 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]);
6379 if (!link_conf) {
6380 dev_kfree_skb(skb);
6381 rcu_read_unlock();
6382 return -ENOLINK;
6383 }
6384 memcpy(to: ehdr->h_source, from: link_conf->addr, ETH_ALEN);
6385 rcu_read_unlock();
6386 }
6387
6388 ehdr->h_proto = proto;
6389
6390 skb->dev = dev;
6391 skb->protocol = proto;
6392 skb_reset_network_header(skb);
6393 skb_reset_mac_header(skb);
6394
6395 if (local->hw.queues < IEEE80211_NUM_ACS)
6396 goto start_xmit;
6397
6398 /* update QoS header to prioritize control port frames if possible,
6399 * prioritization also happens for control port frames send over
6400 * AF_PACKET
6401 */
6402 rcu_read_lock();
6403 err = ieee80211_lookup_ra_sta(sdata, skb, sta_out: &sta);
6404 if (err) {
6405 dev_kfree_skb(skb);
6406 rcu_read_unlock();
6407 return err;
6408 }
6409
6410 if (!IS_ERR(ptr: sta)) {
6411 u16 queue = ieee80211_select_queue(sdata, sta, skb);
6412
6413 skb_set_queue_mapping(skb, queue_mapping: queue);
6414
6415 /*
6416 * for MLO STA, the SA should be the AP MLD address, but
6417 * the link ID has been selected already
6418 */
6419 if (sta && sta->sta.mlo)
6420 memcpy(to: ehdr->h_source, from: sdata->vif.addr, ETH_ALEN);
6421 }
6422 rcu_read_unlock();
6423
6424start_xmit:
6425 local_bh_disable();
6426 __ieee80211_subif_start_xmit(skb, dev: skb->dev, info_flags: flags, ctrl_flags, cookie);
6427 local_bh_enable();
6428
6429 return 0;
6430}
6431
6432int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev,
6433 const u8 *buf, size_t len)
6434{
6435 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
6436 struct ieee80211_local *local = sdata->local;
6437 struct sk_buff *skb;
6438
6439 skb = dev_alloc_skb(length: local->hw.extra_tx_headroom + len +
6440 30 + /* header size */
6441 18); /* 11s header size */
6442 if (!skb)
6443 return -ENOMEM;
6444
6445 skb_reserve(skb, len: local->hw.extra_tx_headroom);
6446 skb_put_data(skb, data: buf, len);
6447
6448 skb->dev = dev;
6449 skb->protocol = htons(ETH_P_802_3);
6450 skb_reset_network_header(skb);
6451 skb_reset_mac_header(skb);
6452
6453 local_bh_disable();
6454 __ieee80211_subif_start_xmit(skb, dev: skb->dev, info_flags: 0,
6455 ctrl_flags: IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP,
6456 NULL);
6457 local_bh_enable();
6458
6459 return 0;
6460}
6461