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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 <[email protected]>
6 * Copyright 2007 Johannes Berg <[email protected]>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Copyright (C) 2018-2026 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(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(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(sband->band, 10, rate, erp,
176 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(sband->band, next_frag_len,
184 txrate->bitrate, erp,
185 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(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(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(&local->hw,
251 IEEE80211_MAX_QUEUE_MAP,
252 IEEE80211_QUEUE_STOP_REASON_PS,
253 false);
254 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
255 wiphy_work_queue(local->hw.wiphy,
256 &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(&local->dynamic_ps_timer, jiffies +
264 msecs_to_jiffies(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(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(hdr->frame_control) &&
283 !ieee80211_is_any_nullfunc(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 __ieee80211_start_scan() for more.
291 */
292 return TX_DROP;
293
294 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
295 return TX_CONTINUE;
296
297 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
298 return TX_CONTINUE;
299
300 if (tx->sta)
301 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
302
303 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
304 if (unlikely(!assoc &&
305 ieee80211_is_data(hdr->frame_control))) {
306#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
307 sdata_info(tx->sdata,
308 "dropped data frame to not associated station %pM\n",
309 hdr->addr1);
310#endif
311 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
312 return TX_DROP;
313 }
314 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
315 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
316 /*
317 * No associated STAs - no need to send multicast
318 * frames.
319 */
320 return TX_DROP;
321 }
322
323 return TX_CONTINUE;
324}
325
326/* This function is called whenever the AP is about to exceed the maximum limit
327 * of buffered frames for power saving STAs. This situation should not really
328 * happen often during normal operation, so dropping the oldest buffered packet
329 * from each queue should be OK to make some room for new frames. */
330static void purge_old_ps_buffers(struct ieee80211_local *local)
331{
332 int total = 0, purged = 0;
333 struct sk_buff *skb;
334 struct ieee80211_sub_if_data *sdata;
335 struct sta_info *sta;
336
337 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
338 struct ps_data *ps;
339
340 if (sdata->vif.type == NL80211_IFTYPE_AP)
341 ps = &sdata->u.ap.ps;
342 else if (ieee80211_vif_is_mesh(&sdata->vif))
343 ps = &sdata->u.mesh.ps;
344 else
345 continue;
346
347 skb = skb_dequeue(&ps->bc_buf);
348 if (skb) {
349 purged++;
350 ieee80211_free_txskb(&local->hw, skb);
351 }
352 total += skb_queue_len(&ps->bc_buf);
353 }
354
355 /*
356 * Drop one frame from each station from the lowest-priority
357 * AC that has frames at all.
358 */
359 list_for_each_entry_rcu(sta, &local->sta_list, list) {
360 int ac;
361
362 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
363 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
364 total += skb_queue_len(&sta->ps_tx_buf[ac]);
365 if (skb) {
366 purged++;
367 ieee80211_free_txskb(&local->hw, skb);
368 break;
369 }
370 }
371 }
372
373 local->total_ps_buffered = total;
374 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
375}
376
377static ieee80211_tx_result
378ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
379{
380 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
381 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
382 struct ps_data *ps;
383
384 /*
385 * broadcast/multicast frame
386 *
387 * If any of the associated/peer stations is in power save mode,
388 * the frame is buffered to be sent after DTIM beacon frame.
389 * This is done either by the hardware or us.
390 */
391
392 /* powersaving STAs currently only in AP/VLAN/mesh mode */
393 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
394 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
395 if (!tx->sdata->bss)
396 return TX_CONTINUE;
397
398 ps = &tx->sdata->bss->ps;
399 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
400 ps = &tx->sdata->u.mesh.ps;
401 } else {
402 return TX_CONTINUE;
403 }
404
405
406 /* no buffering for ordered frames */
407 if (ieee80211_has_order(hdr->frame_control))
408 return TX_CONTINUE;
409
410 if (ieee80211_is_probe_req(hdr->frame_control))
411 return TX_CONTINUE;
412
413 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
414 info->hw_queue = tx->sdata->vif.cab_queue;
415
416 /* no stations in PS mode and no buffered packets */
417 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
418 return TX_CONTINUE;
419
420 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
421
422 /* device releases frame after DTIM beacon */
423 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
424 return TX_CONTINUE;
425
426 /* buffered in mac80211 */
427 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
428 purge_old_ps_buffers(tx->local);
429
430 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
431 ps_dbg(tx->sdata,
432 "BC TX buffer full - dropping the oldest frame\n");
433 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
434 } else
435 tx->local->total_ps_buffered++;
436
437 skb_queue_tail(&ps->bc_buf, tx->skb);
438
439 return TX_QUEUED;
440}
441
442static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
443 struct sk_buff *skb)
444{
445 if (!ieee80211_is_mgmt(fc))
446 return 0;
447
448 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
449 return 0;
450
451 if (!ieee80211_is_robust_mgmt_frame(skb))
452 return 0;
453
454 return 1;
455}
456
457static ieee80211_tx_result
458ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
459{
460 struct sta_info *sta = tx->sta;
461 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
462 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
463 struct ieee80211_local *local = tx->local;
464
465 if (unlikely(!sta))
466 return TX_CONTINUE;
467
468 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
469 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
470 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
471 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
472 int ac = skb_get_queue_mapping(tx->skb);
473
474 if (ieee80211_is_mgmt(hdr->frame_control) &&
475 !ieee80211_is_bufferable_mmpdu(tx->skb)) {
476 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
477 return TX_CONTINUE;
478 }
479
480 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
481 sta->sta.addr, sta->sta.aid, ac);
482 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
483 purge_old_ps_buffers(tx->local);
484
485 /* sync with ieee80211_sta_ps_deliver_wakeup */
486 spin_lock(&sta->ps_lock);
487 /*
488 * STA woke up the meantime and all the frames on ps_tx_buf have
489 * been queued to pending queue. No reordering can happen, go
490 * ahead and Tx the packet.
491 */
492 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
493 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
494 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
495 spin_unlock(&sta->ps_lock);
496 return TX_CONTINUE;
497 }
498
499 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
500 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
501 ps_dbg(tx->sdata,
502 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
503 sta->sta.addr, ac);
504 ieee80211_free_txskb(&local->hw, old);
505 } else
506 tx->local->total_ps_buffered++;
507
508 info->control.jiffies = jiffies;
509 info->control.vif = &tx->sdata->vif;
510 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
511 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
512 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
513 spin_unlock(&sta->ps_lock);
514
515 if (!timer_pending(&local->sta_cleanup))
516 mod_timer(&local->sta_cleanup,
517 round_jiffies(jiffies +
518 STA_INFO_CLEANUP_INTERVAL));
519
520 /*
521 * We queued up some frames, so the TIM bit might
522 * need to be set, recalculate it.
523 */
524 sta_info_recalc_tim(sta);
525
526 return TX_QUEUED;
527 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
528 ps_dbg(tx->sdata,
529 "STA %pM in PS mode, but polling/in SP -> send frame\n",
530 sta->sta.addr);
531 }
532
533 return TX_CONTINUE;
534}
535
536static ieee80211_tx_result debug_noinline
537ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
538{
539 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
540 return TX_CONTINUE;
541
542 if (tx->flags & IEEE80211_TX_UNICAST)
543 return ieee80211_tx_h_unicast_ps_buf(tx);
544 else
545 return ieee80211_tx_h_multicast_ps_buf(tx);
546}
547
548static ieee80211_tx_result debug_noinline
549ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
550{
551 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
552
553 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
554 if (tx->sdata->control_port_no_encrypt)
555 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
556 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
557 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
558 }
559
560 return TX_CONTINUE;
561}
562
563static struct ieee80211_key *
564ieee80211_select_link_key(struct ieee80211_tx_data *tx)
565{
566 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
568 struct ieee80211_link_data *link;
569 unsigned int link_id;
570
571 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK);
572 if (link_id == IEEE80211_LINK_UNSPECIFIED) {
573 link = &tx->sdata->deflink;
574 } else {
575 link = rcu_dereference(tx->sdata->link[link_id]);
576 if (!link)
577 return NULL;
578 }
579
580 if (ieee80211_is_group_privacy_action(tx->skb))
581 return rcu_dereference(link->default_multicast_key);
582 else if (ieee80211_is_mgmt(hdr->frame_control) &&
583 is_multicast_ether_addr(hdr->addr1) &&
584 ieee80211_is_robust_mgmt_frame(tx->skb))
585 return rcu_dereference(link->default_mgmt_key);
586 else if (is_multicast_ether_addr(hdr->addr1))
587 return rcu_dereference(link->default_multicast_key);
588
589 return NULL;
590}
591
592static ieee80211_tx_result debug_noinline
593ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
594{
595 struct ieee80211_key *key;
596 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
597 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
598
599 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) {
600 tx->key = NULL;
601 return TX_CONTINUE;
602 }
603
604 if (tx->sta &&
605 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
606 tx->key = key;
607 else if ((key = ieee80211_select_link_key(tx)))
608 tx->key = key;
609 else if (!is_multicast_ether_addr(hdr->addr1) &&
610 (key = rcu_dereference(tx->sdata->default_unicast_key)))
611 tx->key = key;
612 else
613 tx->key = NULL;
614
615 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
616 if (tx->key && tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
617 info->control.hw_key = &tx->key->conf;
618 return TX_CONTINUE;
619 }
620
621 if (tx->key) {
622 bool skip_hw = false;
623
624 /* TODO: add threshold stuff again */
625
626 switch (tx->key->conf.cipher) {
627 case WLAN_CIPHER_SUITE_WEP40:
628 case WLAN_CIPHER_SUITE_WEP104:
629 case WLAN_CIPHER_SUITE_TKIP:
630 if (!ieee80211_is_data_present(hdr->frame_control))
631 tx->key = NULL;
632 break;
633 case WLAN_CIPHER_SUITE_CCMP:
634 case WLAN_CIPHER_SUITE_CCMP_256:
635 case WLAN_CIPHER_SUITE_GCMP:
636 case WLAN_CIPHER_SUITE_GCMP_256:
637 if (!ieee80211_is_data_present(hdr->frame_control) &&
638 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
639 tx->skb) &&
640 !ieee80211_is_group_privacy_action(tx->skb) &&
641 !ieee80211_require_encrypted_assoc(hdr->frame_control,
642 tx->sta))
643 tx->key = NULL;
644 else
645 skip_hw = (tx->key->conf.flags &
646 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
647 ieee80211_is_mgmt(hdr->frame_control);
648 break;
649 case WLAN_CIPHER_SUITE_AES_CMAC:
650 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
651 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
652 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
653 if (!ieee80211_is_mgmt(hdr->frame_control))
654 tx->key = NULL;
655 break;
656 }
657
658 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
659 !ieee80211_is_deauth(hdr->frame_control)) &&
660 tx->skb->protocol != tx->sdata->control_port_protocol)
661 return TX_DROP;
662
663 if (!skip_hw && tx->key &&
664 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
665 info->control.hw_key = &tx->key->conf;
666 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta &&
667 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) {
668 return TX_DROP;
669 }
670
671 return TX_CONTINUE;
672}
673
674static ieee80211_tx_result debug_noinline
675ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
676{
677 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
678 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
679 struct ieee80211_supported_band *sband;
680 u32 len;
681 struct ieee80211_tx_rate_control txrc;
682 struct ieee80211_sta_rates *ratetbl = NULL;
683 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP;
684 bool assoc = false;
685
686 memset(&txrc, 0, sizeof(txrc));
687
688 if (info->band < NUM_NL80211_BANDS)
689 sband = tx->local->hw.wiphy->bands[info->band];
690 else
691 return TX_CONTINUE;
692
693 len = min_t(u32, tx->skb->len + FCS_LEN,
694 tx->local->hw.wiphy->frag_threshold);
695
696 /* set up the tx rate control struct we give the RC algo */
697 txrc.hw = &tx->local->hw;
698 txrc.sband = sband;
699 txrc.bss_conf = &tx->sdata->vif.bss_conf;
700 txrc.skb = tx->skb;
701 txrc.reported_rate.idx = -1;
702
703 if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) {
704 txrc.rate_idx_mask = ~0;
705 } else {
706 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
707
708 if (tx->sdata->rc_has_mcs_mask[info->band])
709 txrc.rate_idx_mcs_mask =
710 tx->sdata->rc_rateidx_mcs_mask[info->band];
711 }
712
713 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
714 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
715 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
716 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
717
718 /* set up RTS protection if desired */
719 if (len > tx->local->hw.wiphy->rts_threshold) {
720 txrc.rts = true;
721 }
722
723 info->control.use_rts = txrc.rts;
724 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
725
726 /*
727 * Use short preamble if the BSS can handle it, but not for
728 * management frames unless we know the receiver can handle
729 * that -- the management frame might be to a station that
730 * just wants a probe response.
731 */
732 if (tx->sdata->vif.bss_conf.use_short_preamble &&
733 (ieee80211_is_tx_data(tx->skb) ||
734 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
735 txrc.short_preamble = true;
736
737 info->control.short_preamble = txrc.short_preamble;
738
739 /* don't ask rate control when rate already injected via radiotap */
740 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
741 return TX_CONTINUE;
742
743 if (tx->sta)
744 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
745
746 /*
747 * Lets not bother rate control if we're associated and cannot talk to
748 * the sta. This should not happen - except for frames that aren't
749 * really for the peer to start with and already ignore rates.
750 */
751 if (!(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK) &&
752 WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
753 !rate_usable_index_exists(sband, &tx->sta->sta),
754 "%s: Dropped data frame as no usable bitrate found while "
755 "scanning and associated. Target station: "
756 "%pM on %d GHz band\n",
757 tx->sdata->name,
758 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1,
759 info->band ? 5 : 2))
760 return TX_DROP;
761
762 /*
763 * If we're associated with the sta at this point we know we can at
764 * least send the frame at the lowest bit rate.
765 */
766 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
767
768 if (tx->sta && !info->control.skip_table)
769 ratetbl = rcu_dereference(tx->sta->sta.rates);
770
771 if (unlikely(info->control.rates[0].idx < 0)) {
772 if (ratetbl) {
773 struct ieee80211_tx_rate rate = {
774 .idx = ratetbl->rate[0].idx,
775 .flags = ratetbl->rate[0].flags,
776 .count = ratetbl->rate[0].count
777 };
778
779 if (ratetbl->rate[0].idx < 0)
780 return TX_DROP;
781
782 tx->rate = rate;
783 } else {
784 return TX_DROP;
785 }
786 } else {
787 tx->rate = info->control.rates[0];
788 }
789
790 if (txrc.reported_rate.idx < 0) {
791 txrc.reported_rate = tx->rate;
792 if (tx->sta && ieee80211_is_tx_data(tx->skb))
793 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
794 } else if (tx->sta)
795 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
796
797 if (ratetbl)
798 return TX_CONTINUE;
799
800 if (unlikely(!info->control.rates[0].count))
801 info->control.rates[0].count = 1;
802
803 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
804 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
805 info->control.rates[0].count = 1;
806
807 return TX_CONTINUE;
808}
809
810static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
811{
812 u16 *seq = &sta->tid_seq[tid];
813 __le16 ret = cpu_to_le16(*seq);
814
815 /* Increase the sequence number. */
816 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
817
818 return ret;
819}
820
821static ieee80211_tx_result debug_noinline
822ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
823{
824 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
825 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
826 int tid;
827
828 /*
829 * Packet injection may want to control the sequence
830 * number, if we have no matching interface then we
831 * neither assign one ourselves nor ask the driver to.
832 */
833 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
834 return TX_CONTINUE;
835
836 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
837 return TX_CONTINUE;
838
839 if (ieee80211_hdrlen(hdr->frame_control) < 24)
840 return TX_CONTINUE;
841
842 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
843 return TX_CONTINUE;
844
845 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO)
846 return TX_CONTINUE;
847
848 /* SNS11 from 802.11be 10.3.2.14 */
849 if (unlikely(is_multicast_ether_addr(hdr->addr1) &&
850 ieee80211_vif_is_mld(info->control.vif) &&
851 info->control.vif->type == NL80211_IFTYPE_AP)) {
852 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX)
853 tx->sdata->mld_mcast_seq += 0x10;
854 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq);
855 return TX_CONTINUE;
856 }
857
858 /*
859 * Anything but QoS data that has a sequence number field
860 * (is long enough) gets a sequence number from the global
861 * counter. QoS data frames with a multicast destination
862 * also use the global counter (802.11-2012 9.3.2.10).
863 */
864 if (!ieee80211_is_data_qos(hdr->frame_control) ||
865 is_multicast_ether_addr(hdr->addr1)) {
866 /* driver should assign sequence number */
867 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
868 /* for pure STA mode without beacons, we can do it */
869 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
870 tx->sdata->sequence_number += 0x10;
871 if (tx->sta)
872 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++;
873 return TX_CONTINUE;
874 }
875
876 /*
877 * This should be true for injected/management frames only, for
878 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
879 * above since they are not QoS-data frames.
880 */
881 if (!tx->sta)
882 return TX_CONTINUE;
883
884 /* include per-STA, per-TID sequence counter */
885 tid = ieee80211_get_tid(hdr);
886 tx->sta->deflink.tx_stats.msdu[tid]++;
887
888 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
889
890 return TX_CONTINUE;
891}
892
893static int ieee80211_fragment(struct ieee80211_tx_data *tx,
894 struct sk_buff *skb, int hdrlen,
895 int frag_threshold)
896{
897 struct ieee80211_local *local = tx->local;
898 struct ieee80211_tx_info *info;
899 struct sk_buff *tmp;
900 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
901 int pos = hdrlen + per_fragm;
902 int rem = skb->len - hdrlen - per_fragm;
903
904 if (WARN_ON(rem < 0))
905 return -EINVAL;
906
907 /* first fragment was already added to queue by caller */
908
909 while (rem) {
910 int fraglen = per_fragm;
911
912 if (fraglen > rem)
913 fraglen = rem;
914 rem -= fraglen;
915 tmp = dev_alloc_skb(local->tx_headroom +
916 frag_threshold +
917 IEEE80211_ENCRYPT_HEADROOM +
918 IEEE80211_ENCRYPT_TAILROOM);
919 if (!tmp)
920 return -ENOMEM;
921
922 __skb_queue_tail(&tx->skbs, tmp);
923
924 skb_reserve(tmp,
925 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM);
926
927 /* copy control information */
928 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
929
930 info = IEEE80211_SKB_CB(tmp);
931 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
932 IEEE80211_TX_CTL_FIRST_FRAGMENT);
933
934 if (rem)
935 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
936
937 skb_copy_queue_mapping(tmp, skb);
938 tmp->priority = skb->priority;
939 tmp->dev = skb->dev;
940
941 /* copy header and data */
942 skb_put_data(tmp, skb->data, hdrlen);
943 skb_put_data(tmp, skb->data + pos, fraglen);
944
945 pos += fraglen;
946 }
947
948 /* adjust first fragment's length */
949 skb_trim(skb, hdrlen + per_fragm);
950 return 0;
951}
952
953static ieee80211_tx_result debug_noinline
954ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
955{
956 struct sk_buff *skb = tx->skb;
957 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
958 struct ieee80211_hdr *hdr = (void *)skb->data;
959 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
960 int hdrlen;
961 int fragnum;
962
963 /* no matter what happens, tx->skb moves to tx->skbs */
964 __skb_queue_tail(&tx->skbs, skb);
965 tx->skb = NULL;
966
967 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
968 return TX_CONTINUE;
969
970 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
971 return TX_CONTINUE;
972
973 /*
974 * Warn when submitting a fragmented A-MPDU frame and drop it.
975 * This scenario is handled in ieee80211_tx_prepare but extra
976 * caution taken here as fragmented ampdu may cause Tx stop.
977 */
978 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
979 return TX_DROP;
980
981 hdrlen = ieee80211_hdrlen(hdr->frame_control);
982
983 /* internal error, why isn't DONTFRAG set? */
984 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
985 return TX_DROP;
986
987 /*
988 * Now fragment the frame. This will allocate all the fragments and
989 * chain them (using skb as the first fragment) to skb->next.
990 * During transmission, we will remove the successfully transmitted
991 * fragments from this list. When the low-level driver rejects one
992 * of the fragments then we will simply pretend to accept the skb
993 * but store it away as pending.
994 */
995 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
996 return TX_DROP;
997
998 /* update duration/seq/flags of fragments */
999 fragnum = 0;
1000
1001 skb_queue_walk(&tx->skbs, skb) {
1002 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
1003
1004 hdr = (void *)skb->data;
1005 info = IEEE80211_SKB_CB(skb);
1006
1007 if (!skb_queue_is_last(&tx->skbs, skb)) {
1008 hdr->frame_control |= morefrags;
1009 /*
1010 * No multi-rate retries for fragmented frames, that
1011 * would completely throw off the NAV at other STAs.
1012 */
1013 info->control.rates[1].idx = -1;
1014 info->control.rates[2].idx = -1;
1015 info->control.rates[3].idx = -1;
1016 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
1017 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1018 } else {
1019 hdr->frame_control &= ~morefrags;
1020 }
1021 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
1022 fragnum++;
1023 }
1024
1025 return TX_CONTINUE;
1026}
1027
1028static ieee80211_tx_result debug_noinline
1029ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1030{
1031 struct sk_buff *skb;
1032 int ac = -1;
1033
1034 if (!tx->sta)
1035 return TX_CONTINUE;
1036
1037 skb_queue_walk(&tx->skbs, skb) {
1038 ac = skb_get_queue_mapping(skb);
1039 tx->sta->deflink.tx_stats.bytes[ac] += skb->len;
1040 }
1041 if (ac >= 0)
1042 tx->sta->deflink.tx_stats.packets[ac]++;
1043
1044 return TX_CONTINUE;
1045}
1046
1047static ieee80211_tx_result debug_noinline
1048ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1049{
1050 if (!tx->key)
1051 return TX_CONTINUE;
1052
1053 switch (tx->key->conf.cipher) {
1054 case WLAN_CIPHER_SUITE_WEP40:
1055 case WLAN_CIPHER_SUITE_WEP104:
1056 return ieee80211_crypto_wep_encrypt(tx);
1057 case WLAN_CIPHER_SUITE_TKIP:
1058 return ieee80211_crypto_tkip_encrypt(tx);
1059 case WLAN_CIPHER_SUITE_CCMP:
1060 return ieee80211_crypto_ccmp_encrypt(
1061 tx, IEEE80211_CCMP_MIC_LEN);
1062 case WLAN_CIPHER_SUITE_CCMP_256:
1063 return ieee80211_crypto_ccmp_encrypt(
1064 tx, IEEE80211_CCMP_256_MIC_LEN);
1065 case WLAN_CIPHER_SUITE_AES_CMAC:
1066 return ieee80211_crypto_aes_cmac_encrypt(
1067 tx, IEEE80211_CMAC_128_MIC_LEN);
1068 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1069 return ieee80211_crypto_aes_cmac_encrypt(
1070 tx, IEEE80211_CMAC_256_MIC_LEN);
1071 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1072 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1073 return ieee80211_crypto_aes_gmac_encrypt(tx);
1074 case WLAN_CIPHER_SUITE_GCMP:
1075 case WLAN_CIPHER_SUITE_GCMP_256:
1076 return ieee80211_crypto_gcmp_encrypt(tx);
1077 }
1078
1079 return TX_DROP;
1080}
1081
1082static ieee80211_tx_result debug_noinline
1083ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1084{
1085 struct sk_buff *skb;
1086 struct ieee80211_hdr *hdr;
1087 int next_len;
1088 bool group_addr;
1089
1090 skb_queue_walk(&tx->skbs, skb) {
1091 hdr = (void *) skb->data;
1092 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1093 break; /* must not overwrite AID */
1094 if (!skb_queue_is_last(&tx->skbs, skb)) {
1095 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1096 next_len = next->len;
1097 } else
1098 next_len = 0;
1099 group_addr = is_multicast_ether_addr(hdr->addr1);
1100
1101 hdr->duration_id =
1102 ieee80211_duration(tx, skb, group_addr, next_len);
1103 }
1104
1105 return TX_CONTINUE;
1106}
1107
1108/* actual transmit path */
1109
1110static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1111 struct sk_buff *skb,
1112 struct ieee80211_tx_info *info,
1113 struct tid_ampdu_tx *tid_tx,
1114 int tid)
1115{
1116 bool queued = false;
1117 bool reset_agg_timer = false;
1118 struct sk_buff *purge_skb = NULL;
1119
1120 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1121 reset_agg_timer = true;
1122 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1123 /*
1124 * nothing -- this aggregation session is being started
1125 * but that might still fail with the driver
1126 */
1127 } else if (!tx->sta->sta.txq[tid]) {
1128 spin_lock(&tx->sta->lock);
1129 /*
1130 * Need to re-check now, because we may get here
1131 *
1132 * 1) in the window during which the setup is actually
1133 * already done, but not marked yet because not all
1134 * packets are spliced over to the driver pending
1135 * queue yet -- if this happened we acquire the lock
1136 * either before or after the splice happens, but
1137 * need to recheck which of these cases happened.
1138 *
1139 * 2) during session teardown, if the OPERATIONAL bit
1140 * was cleared due to the teardown but the pointer
1141 * hasn't been assigned NULL yet (or we loaded it
1142 * before it was assigned) -- in this case it may
1143 * now be NULL which means we should just let the
1144 * packet pass through because splicing the frames
1145 * back is already done.
1146 */
1147 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1148
1149 if (!tid_tx) {
1150 /* do nothing, let packet pass through */
1151 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1152 reset_agg_timer = true;
1153 } else {
1154 queued = true;
1155 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1156 clear_sta_flag(tx->sta, WLAN_STA_SP);
1157 ps_dbg(tx->sta->sdata,
1158 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1159 tx->sta->sta.addr, tx->sta->sta.aid);
1160 }
1161 info->control.vif = &tx->sdata->vif;
1162 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1163 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1164 __skb_queue_tail(&tid_tx->pending, skb);
1165 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1166 purge_skb = __skb_dequeue(&tid_tx->pending);
1167 }
1168 spin_unlock(&tx->sta->lock);
1169
1170 if (purge_skb)
1171 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1172 }
1173
1174 /* reset session timer */
1175 if (reset_agg_timer)
1176 tid_tx->last_tx = jiffies;
1177
1178 return queued;
1179}
1180
1181void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata,
1182 struct sta_info *sta, struct sk_buff *skb)
1183{
1184 struct rate_control_ref *ref = sdata->local->rate_ctrl;
1185 u16 tid;
1186
1187 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER))
1188 return;
1189
1190 if (!sta ||
1191 (!sta->sta.valid_links && !sta->sta.deflink.ht_cap.ht_supported &&
1192 !sta->sta.deflink.s1g_cap.s1g) ||
1193 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO ||
1194 skb->protocol == sdata->control_port_protocol)
1195 return;
1196
1197 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1198 if (likely(sta->ampdu_mlme.tid_tx[tid]))
1199 return;
1200
1201 ieee80211_start_tx_ba_session(&sta->sta, tid, 0);
1202}
1203
1204/*
1205 * initialises @tx
1206 * pass %NULL for the station if unknown, a valid pointer if known
1207 * or an ERR_PTR() if the station is known not to exist
1208 */
1209static ieee80211_tx_result
1210ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1211 struct ieee80211_tx_data *tx,
1212 struct sta_info *sta, struct sk_buff *skb)
1213{
1214 struct ieee80211_local *local = sdata->local;
1215 struct ieee80211_hdr *hdr;
1216 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1217 bool aggr_check = false;
1218 int tid;
1219
1220 memset(tx, 0, sizeof(*tx));
1221 tx->skb = skb;
1222 tx->local = local;
1223 tx->sdata = sdata;
1224 __skb_queue_head_init(&tx->skbs);
1225
1226 /*
1227 * If this flag is set to true anywhere, and we get here,
1228 * we are doing the needed processing, so remove the flag
1229 * now.
1230 */
1231 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1232
1233 hdr = (struct ieee80211_hdr *) skb->data;
1234
1235 if (likely(sta)) {
1236 if (!IS_ERR(sta))
1237 tx->sta = sta;
1238 } else {
1239 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1240 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1241 if (!tx->sta && sdata->wdev.use_4addr)
1242 return TX_DROP;
1243 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) {
1244 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1245 }
1246 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) {
1247 tx->sta = sta_info_get(sdata, hdr->addr1);
1248 aggr_check = true;
1249 }
1250 }
1251
1252 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1253 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1254 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1255 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1256 struct tid_ampdu_tx *tid_tx;
1257
1258 tid = ieee80211_get_tid(hdr);
1259 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1260 if (!tid_tx && aggr_check) {
1261 ieee80211_aggr_check(sdata, tx->sta, skb);
1262 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1263 }
1264
1265 if (tid_tx) {
1266 bool queued;
1267
1268 queued = ieee80211_tx_prep_agg(tx, skb, info,
1269 tid_tx, tid);
1270
1271 if (unlikely(queued))
1272 return TX_QUEUED;
1273 }
1274 }
1275
1276 if (is_multicast_ether_addr(hdr->addr1)) {
1277 tx->flags &= ~IEEE80211_TX_UNICAST;
1278 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1279 } else
1280 tx->flags |= IEEE80211_TX_UNICAST;
1281
1282 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1283 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1284 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1285 info->flags & IEEE80211_TX_CTL_AMPDU)
1286 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1287 }
1288
1289 if (!tx->sta)
1290 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1291 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1292 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1293 ieee80211_check_fast_xmit(tx->sta);
1294 }
1295
1296 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1297
1298 return TX_CONTINUE;
1299}
1300
1301static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1302 struct ieee80211_vif *vif,
1303 struct sta_info *sta,
1304 struct sk_buff *skb)
1305{
1306 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1307 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1308 struct ieee80211_txq *txq = NULL;
1309
1310 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1311 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1312 return NULL;
1313
1314 /*
1315 * While (re)association request/response frames are not considered
1316 * bufferable MMPDUs, use the TXQ abstraction for the transmission of
1317 * these frames. This is specifically useful for drivers that might
1318 * associate other resources with the TXQ, e.g., encryption keys etc.
1319 */
1320 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
1321 unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
1322 if ((!ieee80211_is_mgmt(hdr->frame_control) ||
1323 ieee80211_is_bufferable_mmpdu(skb) ||
1324 ieee80211_is_assoc(hdr->frame_control) ||
1325 vif->type == NL80211_IFTYPE_STATION ||
1326 vif->type == NL80211_IFTYPE_NAN ||
1327 vif->type == NL80211_IFTYPE_NAN_DATA) &&
1328 sta && sta->uploaded) {
1329 /*
1330 * This will be NULL if the driver didn't set the
1331 * opt-in hardware flag.
1332 */
1333 txq = sta->sta.txq[IEEE80211_NUM_TIDS];
1334 } else if ((!ieee80211_is_mgmt(hdr->frame_control) ||
1335 ieee80211_is_bufferable_mmpdu(skb)) &&
1336 !sta) {
1337 txq = vif->txq_mgmt;
1338 }
1339 } else if (sta) {
1340 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1341
1342 if (!sta->uploaded)
1343 return NULL;
1344
1345 txq = sta->sta.txq[tid];
1346 } else {
1347 txq = vif->txq;
1348 }
1349
1350 if (!txq)
1351 return NULL;
1352
1353 return to_txq_info(txq);
1354}
1355
1356static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1357{
1358 struct sk_buff *next;
1359 codel_time_t now = codel_get_time();
1360
1361 skb_list_walk_safe(skb, skb, next)
1362 IEEE80211_SKB_CB(skb)->control.enqueue_time = now;
1363}
1364
1365static u32 codel_skb_len_func(const struct sk_buff *skb)
1366{
1367 return skb->len;
1368}
1369
1370static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1371{
1372 const struct ieee80211_tx_info *info;
1373
1374 info = (const struct ieee80211_tx_info *)skb->cb;
1375 return info->control.enqueue_time;
1376}
1377
1378static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1379 void *ctx)
1380{
1381 struct ieee80211_local *local;
1382 struct txq_info *txqi;
1383 struct fq *fq;
1384 struct fq_flow *flow;
1385
1386 txqi = ctx;
1387 local = vif_to_sdata(txqi->txq.vif)->local;
1388 fq = &local->fq;
1389
1390 if (cvars == &txqi->def_cvars)
1391 flow = &txqi->tin.default_flow;
1392 else
1393 flow = &fq->flows[cvars - local->cvars];
1394
1395 return fq_flow_dequeue(fq, flow);
1396}
1397
1398static void codel_drop_func(struct sk_buff *skb,
1399 void *ctx)
1400{
1401 struct ieee80211_local *local;
1402 struct ieee80211_hw *hw;
1403 struct txq_info *txqi;
1404
1405 txqi = ctx;
1406 local = vif_to_sdata(txqi->txq.vif)->local;
1407 hw = &local->hw;
1408
1409 ieee80211_free_txskb(hw, skb);
1410}
1411
1412static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1413 struct fq_tin *tin,
1414 struct fq_flow *flow)
1415{
1416 struct ieee80211_local *local;
1417 struct txq_info *txqi;
1418 struct codel_vars *cvars;
1419 struct codel_params *cparams;
1420 struct codel_stats *cstats;
1421
1422 local = container_of(fq, struct ieee80211_local, fq);
1423 txqi = container_of(tin, struct txq_info, tin);
1424 cparams = &local->cparams;
1425 cstats = &txqi->cstats;
1426
1427 if (flow == &tin->default_flow)
1428 cvars = &txqi->def_cvars;
1429 else
1430 cvars = &local->cvars[flow - fq->flows];
1431
1432 return codel_dequeue(txqi,
1433 &flow->backlog,
1434 cparams,
1435 cvars,
1436 cstats,
1437 codel_skb_len_func,
1438 codel_skb_time_func,
1439 codel_drop_func,
1440 codel_dequeue_func);
1441}
1442
1443static void fq_skb_free_func(struct fq *fq,
1444 struct fq_tin *tin,
1445 struct fq_flow *flow,
1446 struct sk_buff *skb)
1447{
1448 struct ieee80211_local *local;
1449
1450 local = container_of(fq, struct ieee80211_local, fq);
1451 ieee80211_free_txskb(&local->hw, skb);
1452}
1453
1454static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1455 struct txq_info *txqi,
1456 struct sk_buff *skb)
1457{
1458 struct fq *fq = &local->fq;
1459 struct fq_tin *tin = &txqi->tin;
1460 u32 flow_idx;
1461
1462 ieee80211_set_skb_enqueue_time(skb);
1463
1464 spin_lock_bh(&fq->lock);
1465 /*
1466 * For management frames, don't really apply codel etc.,
1467 * we don't want to apply any shaping or anything we just
1468 * want to simplify the driver API by having them on the
1469 * txqi.
1470 */
1471 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) {
1472 IEEE80211_SKB_CB(skb)->control.flags |=
1473 IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1474 __skb_queue_tail(&txqi->frags, skb);
1475 } else {
1476 flow_idx = fq_flow_idx(fq, skb);
1477 fq_tin_enqueue(fq, tin, flow_idx, skb,
1478 fq_skb_free_func);
1479 }
1480 spin_unlock_bh(&fq->lock);
1481}
1482
1483static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1484 struct fq_flow *flow, struct sk_buff *skb,
1485 void *data)
1486{
1487 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1488
1489 return info->control.vif == data;
1490}
1491
1492void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1493 struct ieee80211_sub_if_data *sdata)
1494{
1495 struct fq *fq = &local->fq;
1496 struct txq_info *txqi;
1497 struct fq_tin *tin;
1498 struct ieee80211_sub_if_data *ap;
1499
1500 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1501 return;
1502
1503 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1504
1505 if (!ap->vif.txq)
1506 return;
1507
1508 txqi = to_txq_info(ap->vif.txq);
1509 tin = &txqi->tin;
1510
1511 spin_lock_bh(&fq->lock);
1512 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1513 fq_skb_free_func);
1514 spin_unlock_bh(&fq->lock);
1515}
1516
1517void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1518 struct sta_info *sta,
1519 struct txq_info *txqi, int tid)
1520{
1521 fq_tin_init(&txqi->tin);
1522 codel_vars_init(&txqi->def_cvars);
1523 codel_stats_init(&txqi->cstats);
1524 __skb_queue_head_init(&txqi->frags);
1525 INIT_LIST_HEAD(&txqi->schedule_order);
1526
1527 txqi->txq.vif = &sdata->vif;
1528
1529 if (!sta) {
1530 txqi->txq.tid = tid;
1531
1532 if (tid == IEEE80211_NUM_TIDS) {
1533 sdata->vif.txq_mgmt = &txqi->txq;
1534 txqi->txq.ac = IEEE80211_AC_VO;
1535 } else {
1536 sdata->vif.txq = &txqi->txq;
1537 txqi->txq.ac = IEEE80211_AC_BE;
1538 }
1539
1540 return;
1541 }
1542
1543 if (tid == IEEE80211_NUM_TIDS) {
1544 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1545 /* Drivers need to opt in to the management MPDU TXQ */
1546 if (!ieee80211_hw_check(&sdata->local->hw,
1547 STA_MMPDU_TXQ))
1548 return;
1549 } else if (!ieee80211_hw_check(&sdata->local->hw,
1550 BUFF_MMPDU_TXQ)) {
1551 /* Drivers need to opt in to the bufferable MMPDU TXQ */
1552 return;
1553 }
1554 txqi->txq.ac = IEEE80211_AC_VO;
1555 } else {
1556 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1557 }
1558
1559 txqi->txq.sta = &sta->sta;
1560 txqi->txq.tid = tid;
1561 sta->sta.txq[tid] = &txqi->txq;
1562}
1563
1564void ieee80211_txq_purge(struct ieee80211_local *local,
1565 struct txq_info *txqi)
1566{
1567 struct fq *fq = &local->fq;
1568 struct fq_tin *tin = &txqi->tin;
1569
1570 spin_lock_bh(&fq->lock);
1571 fq_tin_reset(fq, tin, fq_skb_free_func);
1572 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1573 spin_unlock_bh(&fq->lock);
1574
1575 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]);
1576 list_del_init(&txqi->schedule_order);
1577 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]);
1578}
1579
1580void ieee80211_txq_set_params(struct ieee80211_local *local, int radio_idx)
1581{
1582 if (local->hw.wiphy->txq_limit)
1583 local->fq.limit = local->hw.wiphy->txq_limit;
1584 else
1585 local->hw.wiphy->txq_limit = local->fq.limit;
1586
1587 if (local->hw.wiphy->txq_memory_limit)
1588 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1589 else
1590 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1591
1592 if (local->hw.wiphy->txq_quantum)
1593 local->fq.quantum = local->hw.wiphy->txq_quantum;
1594 else
1595 local->hw.wiphy->txq_quantum = local->fq.quantum;
1596}
1597
1598int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1599{
1600 struct fq *fq = &local->fq;
1601 int ret;
1602 int i;
1603 bool supp_vht = false;
1604 enum nl80211_band band;
1605
1606 ret = fq_init(fq, 4096);
1607 if (ret)
1608 return ret;
1609
1610 /*
1611 * If the hardware doesn't support VHT, it is safe to limit the maximum
1612 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1613 */
1614 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1615 struct ieee80211_supported_band *sband;
1616
1617 sband = local->hw.wiphy->bands[band];
1618 if (!sband)
1619 continue;
1620
1621 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1622 }
1623
1624 if (!supp_vht)
1625 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1626
1627 codel_params_init(&local->cparams);
1628 local->cparams.interval = MS2TIME(100);
1629 local->cparams.target = MS2TIME(20);
1630 local->cparams.ecn = true;
1631
1632 local->cvars = kvzalloc_objs(local->cvars[0], fq->flows_cnt);
1633 if (!local->cvars) {
1634 spin_lock_bh(&fq->lock);
1635 fq_reset(fq, fq_skb_free_func);
1636 spin_unlock_bh(&fq->lock);
1637 return -ENOMEM;
1638 }
1639
1640 for (i = 0; i < fq->flows_cnt; i++)
1641 codel_vars_init(&local->cvars[i]);
1642
1643 ieee80211_txq_set_params(local, -1);
1644
1645 return 0;
1646}
1647
1648void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1649{
1650 struct fq *fq = &local->fq;
1651
1652 kvfree(local->cvars);
1653 local->cvars = NULL;
1654
1655 spin_lock_bh(&fq->lock);
1656 fq_reset(fq, fq_skb_free_func);
1657 spin_unlock_bh(&fq->lock);
1658}
1659
1660static bool ieee80211_queue_skb(struct ieee80211_local *local,
1661 struct ieee80211_sub_if_data *sdata,
1662 struct sta_info *sta,
1663 struct sk_buff *skb)
1664{
1665 struct ieee80211_vif *vif;
1666 struct txq_info *txqi;
1667
1668 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1669 return false;
1670
1671 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1672 sdata = container_of(sdata->bss,
1673 struct ieee80211_sub_if_data, u.ap);
1674
1675 vif = &sdata->vif;
1676 txqi = ieee80211_get_txq(local, vif, sta, skb);
1677
1678 if (!txqi)
1679 return false;
1680
1681 ieee80211_txq_enqueue(local, txqi, skb);
1682
1683 schedule_and_wake_txq(local, txqi);
1684
1685 return true;
1686}
1687
1688static bool ieee80211_tx_frags(struct ieee80211_local *local,
1689 struct ieee80211_vif *vif,
1690 struct sta_info *sta,
1691 struct sk_buff_head *skbs,
1692 bool txpending)
1693{
1694 struct ieee80211_tx_control control = {};
1695 struct sk_buff *skb, *tmp;
1696 unsigned long flags;
1697
1698 skb_queue_walk_safe(skbs, skb, tmp) {
1699 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1700 int q = info->hw_queue;
1701
1702#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1703 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1704 __skb_unlink(skb, skbs);
1705 ieee80211_free_txskb(&local->hw, skb);
1706 continue;
1707 }
1708#endif
1709
1710 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1711 if (local->queue_stop_reasons[q] ||
1712 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1713 if (unlikely(info->flags &
1714 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1715 if (local->queue_stop_reasons[q] &
1716 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1717 /*
1718 * Drop off-channel frames if queues
1719 * are stopped for any reason other
1720 * than off-channel operation. Never
1721 * queue them.
1722 */
1723 spin_unlock_irqrestore(
1724 &local->queue_stop_reason_lock,
1725 flags);
1726 ieee80211_purge_tx_queue(&local->hw,
1727 skbs);
1728 return true;
1729 }
1730 } else {
1731
1732 /*
1733 * Since queue is stopped, queue up frames for
1734 * later transmission from the tx-pending
1735 * tasklet when the queue is woken again.
1736 */
1737 if (txpending)
1738 skb_queue_splice_init(skbs,
1739 &local->pending[q]);
1740 else
1741 skb_queue_splice_tail_init(skbs,
1742 &local->pending[q]);
1743
1744 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1745 flags);
1746 return false;
1747 }
1748 }
1749 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1750
1751 info->control.vif = vif;
1752 control.sta = sta ? &sta->sta : NULL;
1753
1754 __skb_unlink(skb, skbs);
1755 drv_tx(local, &control, skb);
1756 }
1757
1758 return true;
1759}
1760
1761/*
1762 * Returns false if the frame couldn't be transmitted but was queued instead.
1763 */
1764static bool __ieee80211_tx(struct ieee80211_local *local,
1765 struct sk_buff_head *skbs, struct sta_info *sta,
1766 bool txpending)
1767{
1768 struct ieee80211_tx_info *info;
1769 struct ieee80211_sub_if_data *sdata;
1770 struct ieee80211_vif *vif;
1771 struct sk_buff *skb;
1772 bool result;
1773
1774 if (WARN_ON(skb_queue_empty(skbs)))
1775 return true;
1776
1777 skb = skb_peek(skbs);
1778 info = IEEE80211_SKB_CB(skb);
1779 sdata = vif_to_sdata(info->control.vif);
1780 if (sta && !sta->uploaded)
1781 sta = NULL;
1782
1783 switch (sdata->vif.type) {
1784 case NL80211_IFTYPE_MONITOR:
1785 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) ||
1786 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) {
1787 vif = &sdata->vif;
1788 break;
1789 }
1790 sdata = rcu_dereference(local->monitor_sdata);
1791 if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) {
1792 vif = &sdata->vif;
1793 info->hw_queue =
1794 vif->hw_queue[skb_get_queue_mapping(skb)];
1795 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1796 ieee80211_purge_tx_queue(&local->hw, skbs);
1797 return true;
1798 } else
1799 vif = NULL;
1800 break;
1801 case NL80211_IFTYPE_AP_VLAN:
1802 sdata = container_of(sdata->bss,
1803 struct ieee80211_sub_if_data, u.ap);
1804 fallthrough;
1805 default:
1806 vif = &sdata->vif;
1807 break;
1808 }
1809
1810 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending);
1811
1812 WARN_ON_ONCE(!skb_queue_empty(skbs));
1813
1814 return result;
1815}
1816
1817/*
1818 * Invoke TX handlers, return 0 on success and non-zero if the
1819 * frame was dropped or queued.
1820 *
1821 * The handlers are split into an early and late part. The latter is everything
1822 * that can be sensitive to reordering, and will be deferred to after packets
1823 * are dequeued from the intermediate queues (when they are enabled).
1824 */
1825static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1826{
1827 ieee80211_tx_result res = TX_DROP;
1828
1829#define CALL_TXH(txh) \
1830 do { \
1831 res = txh(tx); \
1832 if (res != TX_CONTINUE) \
1833 goto txh_done; \
1834 } while (0)
1835
1836 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1837 CALL_TXH(ieee80211_tx_h_check_assoc);
1838 CALL_TXH(ieee80211_tx_h_ps_buf);
1839 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1840 CALL_TXH(ieee80211_tx_h_select_key);
1841
1842 txh_done:
1843 if (unlikely(res == TX_DROP)) {
1844 tx->sdata->tx_handlers_drop++;
1845 if (tx->skb)
1846 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1847 else
1848 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1849 return -1;
1850 } else if (unlikely(res == TX_QUEUED)) {
1851 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1852 return -1;
1853 }
1854
1855 return 0;
1856}
1857
1858/*
1859 * Late handlers can be called while the sta lock is held. Handlers that can
1860 * cause packets to be generated will cause deadlock!
1861 */
1862static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1863{
1864 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1865 ieee80211_tx_result res = TX_CONTINUE;
1866
1867 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1868 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1869
1870 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1871 __skb_queue_tail(&tx->skbs, tx->skb);
1872 tx->skb = NULL;
1873 goto txh_done;
1874 }
1875
1876 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1877 CALL_TXH(ieee80211_tx_h_sequence);
1878 CALL_TXH(ieee80211_tx_h_fragment);
1879 /* handlers after fragment must be aware of tx info fragmentation! */
1880 CALL_TXH(ieee80211_tx_h_stats);
1881 CALL_TXH(ieee80211_tx_h_encrypt);
1882 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1883 CALL_TXH(ieee80211_tx_h_calculate_duration);
1884#undef CALL_TXH
1885
1886 txh_done:
1887 if (unlikely(res == TX_DROP)) {
1888 tx->sdata->tx_handlers_drop++;
1889 if (tx->skb)
1890 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1891 else
1892 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1893 return -1;
1894 } else if (unlikely(res == TX_QUEUED)) {
1895 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1896 return -1;
1897 }
1898
1899 return 0;
1900}
1901
1902static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1903{
1904 int r = invoke_tx_handlers_early(tx);
1905
1906 if (r)
1907 return r;
1908 return invoke_tx_handlers_late(tx);
1909}
1910
1911bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1912 struct ieee80211_vif *vif, struct sk_buff *skb,
1913 int band, struct ieee80211_sta **sta)
1914{
1915 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1916 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1917 struct ieee80211_tx_data tx;
1918 struct sk_buff *skb2;
1919
1920 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) {
1921 kfree_skb(skb);
1922 return false;
1923 }
1924
1925 info->band = band;
1926 info->control.vif = vif;
1927 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1928
1929 if (invoke_tx_handlers(&tx))
1930 return false;
1931
1932 if (sta) {
1933 if (tx.sta)
1934 *sta = &tx.sta->sta;
1935 else
1936 *sta = NULL;
1937 }
1938
1939 /* this function isn't suitable for fragmented data frames */
1940 skb2 = __skb_dequeue(&tx.skbs);
1941 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1942 ieee80211_free_txskb(hw, skb2);
1943 ieee80211_purge_tx_queue(hw, &tx.skbs);
1944 return false;
1945 }
1946
1947 return true;
1948}
1949EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1950
1951/*
1952 * Returns false if the frame couldn't be transmitted but was queued instead.
1953 */
1954static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1955 struct sta_info *sta, struct sk_buff *skb,
1956 bool txpending)
1957{
1958 struct ieee80211_local *local = sdata->local;
1959 struct ieee80211_tx_data tx;
1960 ieee80211_tx_result res_prepare;
1961 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1962 bool result = true;
1963
1964 if (unlikely(skb->len < 10)) {
1965 dev_kfree_skb(skb);
1966 return true;
1967 }
1968
1969 /* initialises tx */
1970 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1971
1972 if (unlikely(res_prepare == TX_DROP)) {
1973 ieee80211_free_txskb(&local->hw, skb);
1974 tx.sdata->tx_handlers_drop++;
1975 return true;
1976 } else if (unlikely(res_prepare == TX_QUEUED)) {
1977 return true;
1978 }
1979
1980 /* set up hw_queue value early */
1981 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1982 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1983 info->hw_queue =
1984 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1985
1986 if (invoke_tx_handlers_early(&tx))
1987 return true;
1988
1989 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1990 return true;
1991
1992 if (!invoke_tx_handlers_late(&tx))
1993 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending);
1994
1995 return result;
1996}
1997
1998/* device xmit handlers */
1999
2000enum ieee80211_encrypt {
2001 ENCRYPT_NO,
2002 ENCRYPT_MGMT,
2003 ENCRYPT_DATA,
2004};
2005
2006static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
2007 struct sk_buff *skb,
2008 int head_need,
2009 enum ieee80211_encrypt encrypt)
2010{
2011 struct ieee80211_local *local = sdata->local;
2012 bool enc_tailroom;
2013 int tail_need = 0;
2014
2015 enc_tailroom = encrypt == ENCRYPT_MGMT ||
2016 (encrypt == ENCRYPT_DATA &&
2017 sdata->crypto_tx_tailroom_needed_cnt);
2018
2019 if (enc_tailroom) {
2020 tail_need = IEEE80211_ENCRYPT_TAILROOM;
2021 tail_need -= skb_tailroom(skb);
2022 tail_need = max_t(int, tail_need, 0);
2023 }
2024
2025 if (skb_cloned(skb) &&
2026 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
2027 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
2028 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
2029 else if (head_need || tail_need)
2030 I802_DEBUG_INC(local->tx_expand_skb_head);
2031 else
2032 return 0;
2033
2034 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
2035 wiphy_debug(local->hw.wiphy,
2036 "failed to reallocate TX buffer\n");
2037 return -ENOMEM;
2038 }
2039
2040 return 0;
2041}
2042
2043void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
2044 struct sta_info *sta, struct sk_buff *skb)
2045{
2046 struct ieee80211_local *local = sdata->local;
2047 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2048 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2049 int headroom;
2050 enum ieee80211_encrypt encrypt;
2051
2052 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)
2053 encrypt = ENCRYPT_NO;
2054 else if (ieee80211_is_mgmt(hdr->frame_control))
2055 encrypt = ENCRYPT_MGMT;
2056 else
2057 encrypt = ENCRYPT_DATA;
2058
2059 headroom = local->tx_headroom;
2060 if (encrypt != ENCRYPT_NO)
2061 headroom += IEEE80211_ENCRYPT_HEADROOM;
2062 headroom -= skb_headroom(skb);
2063 headroom = max_t(int, 0, headroom);
2064
2065 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) {
2066 ieee80211_free_txskb(&local->hw, skb);
2067 return;
2068 }
2069
2070 /* reload after potential resize */
2071 hdr = (struct ieee80211_hdr *) skb->data;
2072 info->control.vif = &sdata->vif;
2073
2074 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2075 if (ieee80211_is_data(hdr->frame_control) &&
2076 is_unicast_ether_addr(hdr->addr1)) {
2077 if (mesh_nexthop_resolve(sdata, skb))
2078 return; /* skb queued: don't free */
2079 } else {
2080 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2081 }
2082 }
2083
2084 ieee80211_set_qos_hdr(sdata, skb);
2085 ieee80211_tx(sdata, sta, skb, false);
2086}
2087
2088static bool ieee80211_validate_radiotap_len(struct sk_buff *skb)
2089{
2090 struct ieee80211_radiotap_header *rthdr =
2091 (struct ieee80211_radiotap_header *)skb->data;
2092
2093 /* check for not even having the fixed radiotap header part */
2094 if (unlikely(skb_headlen(skb) < sizeof(struct ieee80211_radiotap_header)))
2095 return false; /* too short to be possibly valid */
2096
2097 /* is it a header version we can trust to find length from? */
2098 if (unlikely(rthdr->it_version))
2099 return false; /* only version 0 is supported */
2100
2101 /* does the skb contain enough to deliver on the alleged length? */
2102 if (unlikely(skb_headlen(skb) < ieee80211_get_radiotap_len(skb->data)))
2103 return false; /* skb too short for claimed rt header extent */
2104
2105 return true;
2106}
2107
2108static bool ieee80211_rate_bw_usable(u16 rate_flags,
2109 const struct cfg80211_chan_def *chandef)
2110{
2111 int width;
2112
2113 if (!chandef)
2114 return true;
2115
2116 if (rate_flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
2117 width = 160;
2118 else if (rate_flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
2119 width = 80;
2120 else if (rate_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
2121 width = 40;
2122 else
2123 return true;
2124
2125 return width <= cfg80211_chandef_get_width(chandef);
2126}
2127
2128bool ieee80211_parse_tx_radiotap(struct sk_buff *skb,
2129 struct net_device *dev,
2130 const struct cfg80211_chan_def *chandef)
2131{
2132 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2133 struct ieee80211_radiotap_iterator iterator;
2134 struct ieee80211_radiotap_header *rthdr =
2135 (struct ieee80211_radiotap_header *) skb->data;
2136 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2137 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2138 NULL);
2139 u16 txflags;
2140 u16 rate = 0;
2141 bool rate_found = false;
2142 u8 rate_retries = 0;
2143 u16 rate_flags = 0;
2144 u8 mcs_known, mcs_flags, mcs_bw;
2145 u16 vht_known;
2146 u8 vht_mcs = 0, vht_nss = 0;
2147 int i;
2148
2149 if (!ieee80211_validate_radiotap_len(skb))
2150 return false;
2151
2152 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2153 IEEE80211_TX_CTL_DONTFRAG;
2154
2155 /*
2156 * for every radiotap entry that is present
2157 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2158 * entries present, or -EINVAL on error)
2159 */
2160
2161 while (!ret) {
2162 ret = ieee80211_radiotap_iterator_next(&iterator);
2163
2164 if (ret)
2165 continue;
2166
2167 /* see if this argument is something we can use */
2168 switch (iterator.this_arg_index) {
2169 /*
2170 * You must take care when dereferencing iterator.this_arg
2171 * for multibyte types... the pointer is not aligned. Use
2172 * get_unaligned((type *)iterator.this_arg) to dereference
2173 * iterator.this_arg for type "type" safely on all arches.
2174 */
2175 case IEEE80211_RADIOTAP_FLAGS:
2176 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2177 /*
2178 * this indicates that the skb we have been
2179 * handed has the 32-bit FCS CRC at the end...
2180 * we should react to that by snipping it off
2181 * because it will be recomputed and added
2182 * on transmission
2183 */
2184 if (skb->len < (iterator._max_length + FCS_LEN))
2185 return false;
2186
2187 skb_trim(skb, skb->len - FCS_LEN);
2188 }
2189 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2190 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2191 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2192 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2193 break;
2194
2195 case IEEE80211_RADIOTAP_TX_FLAGS:
2196 txflags = get_unaligned_le16(iterator.this_arg);
2197 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2198 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2199 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO)
2200 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
2201 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER)
2202 info->control.flags |=
2203 IEEE80211_TX_CTRL_DONT_REORDER;
2204 break;
2205
2206 case IEEE80211_RADIOTAP_RATE:
2207 rate = *iterator.this_arg;
2208 rate_flags = 0;
2209 rate_found = true;
2210 break;
2211
2212 case IEEE80211_RADIOTAP_ANTENNA:
2213 /* this can appear multiple times, keep a bitmap */
2214 /* control.antennas is only a 2-bit bitmap */
2215 if (*iterator.this_arg < 2)
2216 info->control.antennas |= BIT(*iterator.this_arg);
2217 break;
2218
2219 case IEEE80211_RADIOTAP_DATA_RETRIES:
2220 rate_retries = *iterator.this_arg;
2221 break;
2222
2223 case IEEE80211_RADIOTAP_MCS:
2224 mcs_known = iterator.this_arg[0];
2225 mcs_flags = iterator.this_arg[1];
2226 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2227 break;
2228
2229 rate_found = true;
2230 rate = iterator.this_arg[2];
2231 rate_flags = IEEE80211_TX_RC_MCS;
2232
2233 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2234 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2235 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2236
2237 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2238 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2239 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2240 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2241
2242 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC &&
2243 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC)
2244 info->flags |= IEEE80211_TX_CTL_LDPC;
2245
2246 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) {
2247 u8 stbc = u8_get_bits(mcs_flags,
2248 IEEE80211_RADIOTAP_MCS_STBC_MASK);
2249
2250 info->flags |=
2251 u32_encode_bits(stbc,
2252 IEEE80211_TX_CTL_STBC);
2253 }
2254 break;
2255
2256 case IEEE80211_RADIOTAP_VHT:
2257 vht_known = get_unaligned_le16(iterator.this_arg);
2258 rate_found = true;
2259
2260 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2261 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2262 (iterator.this_arg[2] &
2263 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2264 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2265 if (vht_known &
2266 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2267 if (iterator.this_arg[3] == 1)
2268 rate_flags |=
2269 IEEE80211_TX_RC_40_MHZ_WIDTH;
2270 else if (iterator.this_arg[3] == 4)
2271 rate_flags |=
2272 IEEE80211_TX_RC_80_MHZ_WIDTH;
2273 else if (iterator.this_arg[3] == 11)
2274 rate_flags |=
2275 IEEE80211_TX_RC_160_MHZ_WIDTH;
2276 }
2277
2278 vht_mcs = iterator.this_arg[4] >> 4;
2279 if (vht_mcs > 11)
2280 vht_mcs = 0;
2281 vht_nss = iterator.this_arg[4] & 0xF;
2282 if (!vht_nss || vht_nss > 8)
2283 vht_nss = 1;
2284 break;
2285
2286 /*
2287 * Please update the file
2288 * Documentation/networking/mac80211-injection.rst
2289 * when parsing new fields here.
2290 */
2291
2292 default:
2293 break;
2294 }
2295 }
2296
2297 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2298 return false;
2299
2300 if (rate_found) {
2301 struct ieee80211_supported_band *sband =
2302 local->hw.wiphy->bands[info->band];
2303
2304 if (!ieee80211_rate_bw_usable(rate_flags, chandef))
2305 return false;
2306
2307 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2308
2309 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2310 info->control.rates[i].idx = -1;
2311 info->control.rates[i].flags = 0;
2312 info->control.rates[i].count = 0;
2313 }
2314
2315 if (rate_flags & IEEE80211_TX_RC_MCS) {
2316 /* reset antennas if not enough */
2317 if (IEEE80211_HT_MCS_CHAINS(rate) >
2318 hweight8(info->control.antennas))
2319 info->control.antennas = 0;
2320
2321 info->control.rates[0].idx = rate;
2322 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2323 /* reset antennas if not enough */
2324 if (vht_nss > hweight8(info->control.antennas))
2325 info->control.antennas = 0;
2326
2327 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2328 vht_nss);
2329 } else if (sband) {
2330 for (i = 0; i < sband->n_bitrates; i++) {
2331 if (rate * 5 != sband->bitrates[i].bitrate)
2332 continue;
2333
2334 info->control.rates[0].idx = i;
2335 break;
2336 }
2337 }
2338
2339 if (info->control.rates[0].idx < 0)
2340 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2341
2342 info->control.rates[0].flags = rate_flags;
2343 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2344 local->hw.max_rate_tries);
2345 }
2346
2347 return true;
2348}
2349
2350netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2351 struct net_device *dev)
2352{
2353 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2354 struct ieee80211_chanctx_conf *chanctx_conf;
2355 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2356 struct ieee80211_hdr *hdr;
2357 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2358 struct cfg80211_chan_def *chandef;
2359 u16 len_rthdr;
2360 int hdrlen;
2361
2362 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2363 if (unlikely(!ieee80211_sdata_running(sdata)))
2364 goto fail;
2365
2366 memset(info, 0, sizeof(*info));
2367 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2368 IEEE80211_TX_CTL_INJECTED;
2369
2370 /* Sanity-check the length of the radiotap header */
2371 if (!ieee80211_validate_radiotap_len(skb))
2372 goto fail;
2373
2374 /* we now know there is a radiotap header with a length we can use */
2375 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2376
2377 /*
2378 * fix up the pointers accounting for the radiotap
2379 * header still being in there. We are being given
2380 * a precooked IEEE80211 header so no need for
2381 * normal processing
2382 */
2383 skb_set_mac_header(skb, len_rthdr);
2384 /*
2385 * these are just fixed to the end of the rt area since we
2386 * don't have any better information and at this point, nobody cares
2387 */
2388 skb_set_network_header(skb, len_rthdr);
2389 skb_set_transport_header(skb, len_rthdr);
2390
2391 if (skb_headlen(skb) < len_rthdr + 2)
2392 goto fail;
2393
2394 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2395 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2396
2397 if (skb_headlen(skb) < len_rthdr + hdrlen)
2398 goto fail;
2399
2400 /*
2401 * Initialize skb->protocol if the injected frame is a data frame
2402 * carrying a rfc1042 header
2403 */
2404 if (ieee80211_is_data(hdr->frame_control) &&
2405 skb_headlen(skb) >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2406 u8 *payload = (u8 *)hdr + hdrlen;
2407
2408 if (ether_addr_equal(payload, rfc1042_header))
2409 skb->protocol = cpu_to_be16((payload[6] << 8) |
2410 payload[7]);
2411 }
2412
2413 rcu_read_lock();
2414
2415 /*
2416 * We process outgoing injected frames that have a local address
2417 * we handle as though they are non-injected frames.
2418 * This code here isn't entirely correct, the local MAC address
2419 * isn't always enough to find the interface to use; for proper
2420 * VLAN support we have an nl80211-based mechanism.
2421 *
2422 * This is necessary, for example, for old hostapd versions that
2423 * don't use nl80211-based management TX/RX.
2424 */
2425 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2426 if (!ieee80211_sdata_running(tmp_sdata))
2427 continue;
2428 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2429 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2430 continue;
2431 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2432 sdata = tmp_sdata;
2433 break;
2434 }
2435 }
2436
2437 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2438 if (!chanctx_conf) {
2439 tmp_sdata = rcu_dereference(local->monitor_sdata);
2440 if (tmp_sdata)
2441 chanctx_conf =
2442 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf);
2443 }
2444
2445 if (!chanctx_conf) {
2446 struct ieee80211_chanctx *ctx;
2447 bool first = true;
2448
2449 list_for_each_entry_rcu(ctx, &local->chanctx_list, list) {
2450 if (!first)
2451 goto fail_rcu;
2452 chanctx_conf = &ctx->conf;
2453 first = false;
2454 }
2455 }
2456
2457 if (chanctx_conf)
2458 chandef = &chanctx_conf->def;
2459 else
2460 goto fail_rcu;
2461
2462 /*
2463 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still
2464 * shouldn't transmit on disabled channels.
2465 */
2466 if (!cfg80211_chandef_usable(local->hw.wiphy, chandef,
2467 IEEE80211_CHAN_DISABLED))
2468 goto fail_rcu;
2469
2470 /*
2471 * Frame injection is not allowed if beaconing is not allowed
2472 * or if we need radar detection. Beaconing is usually not allowed when
2473 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2474 * Passive scan is also used in world regulatory domains where
2475 * your country is not known and as such it should be treated as
2476 * NO TX unless the channel is explicitly allowed in which case
2477 * your current regulatory domain would not have the passive scan
2478 * flag.
2479 *
2480 * Since AP mode uses monitor interfaces to inject/TX management
2481 * frames we can make AP mode the exception to this rule once it
2482 * supports radar detection as its implementation can deal with
2483 * radar detection by itself. We can do that later by adding a
2484 * monitor flag interfaces used for AP support.
2485 */
2486 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2487 sdata->vif.type))
2488 goto fail_rcu;
2489
2490 info->band = chandef->chan->band;
2491
2492 /* Initialize skb->priority according to frame type and TID class,
2493 * with respect to the sub interface that the frame will actually
2494 * be transmitted on. If the DONT_REORDER flag is set, the original
2495 * skb-priority is preserved to assure frames injected with this
2496 * flag are not reordered relative to each other.
2497 */
2498 ieee80211_select_queue_80211(sdata, skb, hdr);
2499 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority));
2500
2501 /*
2502 * Process the radiotap header. This will now take into account the
2503 * selected chandef above to accurately set injection rates and
2504 * retransmissions.
2505 */
2506 if (!ieee80211_parse_tx_radiotap(skb, dev, chandef))
2507 goto fail_rcu;
2508
2509 /* remove the injection radiotap header */
2510 skb_pull(skb, len_rthdr);
2511
2512 ieee80211_xmit(sdata, NULL, skb);
2513 rcu_read_unlock();
2514
2515 return NETDEV_TX_OK;
2516
2517fail_rcu:
2518 rcu_read_unlock();
2519fail:
2520 dev_kfree_skb(skb);
2521 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2522}
2523
2524static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2525{
2526 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2527
2528 return ethertype == ETH_P_TDLS &&
2529 skb->len > 14 &&
2530 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2531}
2532
2533int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2534 struct sk_buff *skb,
2535 struct sta_info **sta_out, bool bss)
2536{
2537 struct sta_info *sta;
2538
2539 switch (sdata->vif.type) {
2540 case NL80211_IFTYPE_AP_VLAN:
2541 sta = rcu_dereference(sdata->u.vlan.sta);
2542 if (sta) {
2543 *sta_out = sta;
2544 return 0;
2545 } else if (sdata->wdev.use_4addr) {
2546 return -ENOLINK;
2547 }
2548 fallthrough;
2549 case NL80211_IFTYPE_AP:
2550 case NL80211_IFTYPE_OCB:
2551 case NL80211_IFTYPE_ADHOC:
2552 if (is_multicast_ether_addr(skb->data)) {
2553 *sta_out = ERR_PTR(-ENOENT);
2554 return 0;
2555 }
2556 if (bss)
2557 sta = sta_info_get_bss(sdata, skb->data);
2558 else
2559 sta = sta_info_get(sdata, skb->data);
2560 break;
2561#ifdef CONFIG_MAC80211_MESH
2562 case NL80211_IFTYPE_MESH_POINT:
2563 /* determined much later */
2564 *sta_out = NULL;
2565 return 0;
2566#endif
2567 case NL80211_IFTYPE_STATION:
2568 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2569 sta = sta_info_get(sdata, skb->data);
2570 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2571 if (test_sta_flag(sta,
2572 WLAN_STA_TDLS_PEER_AUTH)) {
2573 *sta_out = sta;
2574 return 0;
2575 }
2576
2577 /*
2578 * TDLS link during setup - throw out frames to
2579 * peer. Allow TDLS-setup frames to unauthorized
2580 * peers for the special case of a link teardown
2581 * after a TDLS sta is removed due to being
2582 * unreachable.
2583 */
2584 if (!ieee80211_is_tdls_setup(skb))
2585 return -EINVAL;
2586 }
2587
2588 }
2589
2590 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
2591 if (!sta)
2592 return -ENOLINK;
2593 break;
2594 case NL80211_IFTYPE_NAN_DATA:
2595 if (is_multicast_ether_addr(skb->data)) {
2596 *sta_out = ERR_PTR(-ENOENT);
2597 return 0;
2598 }
2599 sta = sta_info_get(sdata, skb->data);
2600 break;
2601 default:
2602 return -EINVAL;
2603 }
2604
2605 *sta_out = sta ?: ERR_PTR(-ENOENT);
2606 return 0;
2607}
2608
2609static u16 ieee80211_store_ack_skb(struct ieee80211_local *local,
2610 struct sk_buff *skb,
2611 u32 *info_flags,
2612 u64 cookie)
2613{
2614 struct sk_buff *ack_skb;
2615 u16 info_id = 0;
2616
2617 if (skb->sk)
2618 ack_skb = skb_clone_sk(skb);
2619 else
2620 ack_skb = skb_clone(skb, GFP_ATOMIC);
2621
2622 if (ack_skb) {
2623 unsigned long flags;
2624 int id;
2625
2626 spin_lock_irqsave(&local->ack_status_lock, flags);
2627 id = idr_alloc(&local->ack_status_frames, ack_skb,
2628 1, 0x2000, GFP_ATOMIC);
2629 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2630
2631 if (id >= 0) {
2632 info_id = id;
2633 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2634 if (cookie)
2635 IEEE80211_SKB_CB(ack_skb)->ack.cookie = cookie;
2636 } else {
2637 kfree_skb(ack_skb);
2638 }
2639 }
2640
2641 return info_id;
2642}
2643
2644static void ieee80211_remove_ack_skb(struct ieee80211_local *local, u16 info_id)
2645{
2646 struct sk_buff *ack_skb;
2647 unsigned long flags;
2648
2649 spin_lock_irqsave(&local->ack_status_lock, flags);
2650 ack_skb = idr_remove(&local->ack_status_frames, info_id);
2651 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2652
2653 kfree_skb(ack_skb);
2654}
2655
2656/**
2657 * ieee80211_build_hdr - build 802.11 header in the given frame
2658 * @sdata: virtual interface to build the header for
2659 * @skb: the skb to build the header in
2660 * @info_flags: skb flags to set
2661 * @sta: the station pointer
2662 * @ctrl_flags: info control flags to set
2663 * @cookie: cookie pointer to fill (if not %NULL)
2664 *
2665 * This function takes the skb with 802.3 header and reformats the header to
2666 * the appropriate IEEE 802.11 header based on which interface the packet is
2667 * being transmitted on.
2668 *
2669 * Note that this function also takes care of the TX status request and
2670 * potential unsharing of the SKB - this needs to be interleaved with the
2671 * header building.
2672 *
2673 * The function requires the read-side RCU lock held
2674 *
2675 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2676 */
2677static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2678 struct sk_buff *skb, u32 info_flags,
2679 struct sta_info *sta, u32 ctrl_flags,
2680 u64 cookie)
2681{
2682 struct ieee80211_local *local = sdata->local;
2683 struct ieee80211_tx_info *info;
2684 int head_need;
2685 u16 ethertype, hdrlen, meshhdrlen = 0;
2686 __le16 fc;
2687 struct ieee80211_hdr hdr;
2688 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2689 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2690 const u8 *encaps_data;
2691 int encaps_len, skip_header_bytes;
2692 bool wme_sta = false, authorized = false;
2693 bool tdls_peer;
2694 bool multicast;
2695 u16 info_id = 0;
2696 struct ieee80211_chanctx_conf *chanctx_conf = NULL;
2697 enum nl80211_band band;
2698 int ret;
2699 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK);
2700
2701 if (IS_ERR(sta))
2702 sta = NULL;
2703
2704#ifdef CONFIG_MAC80211_DEBUGFS
2705 if (local->force_tx_status)
2706 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2707#endif
2708
2709 /* convert Ethernet header to proper 802.11 header (based on
2710 * operation mode) */
2711 ethertype = (skb->data[12] << 8) | skb->data[13];
2712 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2713
2714 if (!ieee80211_vif_is_mld(&sdata->vif))
2715 chanctx_conf =
2716 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2717
2718 switch (sdata->vif.type) {
2719 case NL80211_IFTYPE_AP_VLAN:
2720 if (sdata->wdev.use_4addr) {
2721 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2722 /* RA TA DA SA */
2723 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2724 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2725 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2726 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2727 hdrlen = 30;
2728 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2729 wme_sta = sta->sta.wme;
2730 }
2731 if (!ieee80211_vif_is_mld(&sdata->vif)) {
2732 struct ieee80211_sub_if_data *ap_sdata;
2733
2734 /* override chanctx_conf from AP (we don't have one) */
2735 ap_sdata = container_of(sdata->bss,
2736 struct ieee80211_sub_if_data,
2737 u.ap);
2738 chanctx_conf =
2739 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf);
2740 }
2741 if (sdata->wdev.use_4addr)
2742 break;
2743 fallthrough;
2744 case NL80211_IFTYPE_AP:
2745 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2746 /* DA BSSID SA */
2747 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2748
2749 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) {
2750 struct ieee80211_link_data *link;
2751
2752 link_id = sta->deflink.link_id;
2753 link = rcu_dereference(sdata->link[link_id]);
2754 if (WARN_ON(!link)) {
2755 ret = -ENOLINK;
2756 goto free;
2757 }
2758 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN);
2759 } else if (link_id == IEEE80211_LINK_UNSPECIFIED ||
2760 (sta && sta->sta.mlo)) {
2761 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2762 } else {
2763 struct ieee80211_bss_conf *conf;
2764
2765 conf = rcu_dereference(sdata->vif.link_conf[link_id]);
2766 if (unlikely(!conf)) {
2767 ret = -ENOLINK;
2768 goto free;
2769 }
2770
2771 memcpy(hdr.addr2, conf->addr, ETH_ALEN);
2772 }
2773
2774 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2775 hdrlen = 24;
2776 break;
2777#ifdef CONFIG_MAC80211_MESH
2778 case NL80211_IFTYPE_MESH_POINT:
2779 if (!is_multicast_ether_addr(skb->data)) {
2780 struct sta_info *next_hop;
2781 bool mpp_lookup = true;
2782
2783 mpath = mesh_path_lookup(sdata, skb->data);
2784 if (mpath) {
2785 mpp_lookup = false;
2786 next_hop = rcu_dereference(mpath->next_hop);
2787 if (!next_hop ||
2788 !(mpath->flags & (MESH_PATH_ACTIVE |
2789 MESH_PATH_RESOLVING)))
2790 mpp_lookup = true;
2791 }
2792
2793 if (mpp_lookup) {
2794 mppath = mpp_path_lookup(sdata, skb->data);
2795 if (mppath)
2796 mppath->exp_time = jiffies;
2797 }
2798
2799 if (mppath && mpath)
2800 mesh_path_del(sdata, mpath->dst);
2801 }
2802
2803 /*
2804 * Use address extension if it is a packet from
2805 * another interface or if we know the destination
2806 * is being proxied by a portal (i.e. portal address
2807 * differs from proxied address)
2808 */
2809 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2810 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2811 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2812 skb->data, skb->data + ETH_ALEN);
2813 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2814 NULL, NULL);
2815 } else {
2816 /* DS -> MBSS (802.11-2012 13.11.3.3).
2817 * For unicast with unknown forwarding information,
2818 * destination might be in the MBSS or if that fails
2819 * forwarded to another mesh gate. In either case
2820 * resolution will be handled in ieee80211_xmit(), so
2821 * leave the original DA. This also works for mcast */
2822 const u8 *mesh_da = skb->data;
2823
2824 if (mppath)
2825 mesh_da = mppath->mpp;
2826 else if (mpath)
2827 mesh_da = mpath->dst;
2828
2829 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2830 mesh_da, sdata->vif.addr);
2831 if (is_multicast_ether_addr(mesh_da))
2832 /* DA TA mSA AE:SA */
2833 meshhdrlen = ieee80211_new_mesh_header(
2834 sdata, &mesh_hdr,
2835 skb->data + ETH_ALEN, NULL);
2836 else
2837 /* RA TA mDA mSA AE:DA SA */
2838 meshhdrlen = ieee80211_new_mesh_header(
2839 sdata, &mesh_hdr, skb->data,
2840 skb->data + ETH_ALEN);
2841
2842 }
2843
2844 /* For injected frames, fill RA right away as nexthop lookup
2845 * will be skipped.
2846 */
2847 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) &&
2848 is_zero_ether_addr(hdr.addr1))
2849 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2850 break;
2851#endif
2852 case NL80211_IFTYPE_STATION:
2853 /* we already did checks when looking up the RA STA */
2854 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2855
2856 if (tdls_peer) {
2857 /* For TDLS only one link can be valid with peer STA */
2858 int tdls_link_id = ieee80211_tdls_sta_link_id(sta);
2859 struct ieee80211_link_data *link;
2860
2861 /* DA SA BSSID */
2862 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2863 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2864 link = rcu_dereference(sdata->link[tdls_link_id]);
2865 if (WARN_ON_ONCE(!link)) {
2866 ret = -EINVAL;
2867 goto free;
2868 }
2869 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN);
2870 hdrlen = 24;
2871 } else if (sdata->u.mgd.use_4addr &&
2872 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2873 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2874 IEEE80211_FCTL_TODS);
2875 /* RA TA DA SA */
2876 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN);
2877 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2878 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2879 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2880 hdrlen = 30;
2881 } else {
2882 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2883 /* BSSID SA DA */
2884 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN);
2885 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2886 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2887 hdrlen = 24;
2888 }
2889 break;
2890 case NL80211_IFTYPE_OCB:
2891 /* DA SA BSSID */
2892 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2893 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2894 eth_broadcast_addr(hdr.addr3);
2895 hdrlen = 24;
2896 break;
2897 case NL80211_IFTYPE_ADHOC:
2898 /* DA SA BSSID */
2899 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2900 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2901 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2902 hdrlen = 24;
2903 break;
2904 case NL80211_IFTYPE_NAN_DATA: {
2905 struct ieee80211_sub_if_data *nmi;
2906
2907 /* DA SA Cluster ID */
2908 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2909 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2910 nmi = rcu_dereference(sdata->u.nan_data.nmi);
2911 if (!nmi) {
2912 ret = -ENOTCONN;
2913 goto free;
2914 }
2915 memcpy(hdr.addr3, nmi->u.nan.conf.cluster_id, ETH_ALEN);
2916 hdrlen = 24;
2917 break;
2918 }
2919 default:
2920 ret = -EINVAL;
2921 goto free;
2922 }
2923
2924 if (!chanctx_conf) {
2925 if (sdata->vif.type == NL80211_IFTYPE_NAN_DATA) {
2926 /* NAN operates on multiple bands */
2927 band = NUM_NL80211_BANDS;
2928 } else if (!ieee80211_vif_is_mld(&sdata->vif)) {
2929 ret = -ENOTCONN;
2930 goto free;
2931 } else {
2932 /* MLD transmissions must not rely on the band */
2933 band = 0;
2934 }
2935 } else {
2936 band = chanctx_conf->def.chan->band;
2937 }
2938
2939 multicast = is_multicast_ether_addr(hdr.addr1);
2940
2941 /* sta is always NULL for mesh */
2942 if (sta) {
2943 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2944 wme_sta = sta->sta.wme;
2945 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2946 /* For mesh, the use of the QoS header is mandatory */
2947 wme_sta = true;
2948 }
2949
2950 /* receiver does QoS (which also means we do) use it */
2951 if (wme_sta) {
2952 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2953 hdrlen += 2;
2954 }
2955
2956 /*
2957 * Drop unicast frames to unauthorised stations unless they are
2958 * EAPOL frames from the local station.
2959 */
2960 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2961 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2962 !multicast && !authorized &&
2963 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2964 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) {
2965#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2966 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2967 sdata->name, hdr.addr1);
2968#endif
2969
2970 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2971
2972 ret = -EPERM;
2973 goto free;
2974 }
2975
2976 if (unlikely(!multicast &&
2977 (sk_requests_wifi_status(skb->sk) ||
2978 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS)))
2979 info_id = ieee80211_store_ack_skb(local, skb, &info_flags,
2980 cookie);
2981
2982 /*
2983 * If the skb is shared we need to obtain our own copy.
2984 */
2985 skb = skb_share_check(skb, GFP_ATOMIC);
2986 if (unlikely(!skb)) {
2987 /* skb_share_check() already freed the skb */
2988 if (info_id)
2989 ieee80211_remove_ack_skb(local, info_id);
2990 return ERR_PTR(-ENOMEM);
2991 }
2992
2993 /* set this up so failure paths can clean up ack skb */
2994 info = IEEE80211_SKB_CB(skb);
2995 memset(info, 0, sizeof(*info));
2996
2997 info->flags = info_flags;
2998 if (info_id) {
2999 info->status_data = info_id;
3000 info->status_data_idr = 1;
3001 }
3002 info->band = band;
3003
3004 hdr.frame_control = fc;
3005 hdr.duration_id = 0;
3006 hdr.seq_ctrl = 0;
3007
3008 skip_header_bytes = ETH_HLEN;
3009 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
3010 encaps_data = bridge_tunnel_header;
3011 encaps_len = sizeof(bridge_tunnel_header);
3012 skip_header_bytes -= 2;
3013 } else if (ethertype >= ETH_P_802_3_MIN) {
3014 encaps_data = rfc1042_header;
3015 encaps_len = sizeof(rfc1042_header);
3016 skip_header_bytes -= 2;
3017 } else {
3018 encaps_data = NULL;
3019 encaps_len = 0;
3020 }
3021
3022 skb_pull(skb, skip_header_bytes);
3023 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
3024
3025 /*
3026 * So we need to modify the skb header and hence need a copy of
3027 * that. The head_need variable above doesn't, so far, include
3028 * the needed header space that we don't need right away. If we
3029 * can, then we don't reallocate right now but only after the
3030 * frame arrives at the master device (if it does...)
3031 *
3032 * If we cannot, however, then we will reallocate to include all
3033 * the ever needed space. Also, if we need to reallocate it anyway,
3034 * make it big enough for everything we may ever need.
3035 */
3036
3037 if (head_need > 0 || skb_cloned(skb)) {
3038 head_need += IEEE80211_ENCRYPT_HEADROOM;
3039 head_need += local->tx_headroom;
3040 head_need = max_t(int, 0, head_need);
3041 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) {
3042 ret = -ENOMEM;
3043 goto free_txskb;
3044 }
3045 }
3046
3047 if (encaps_data)
3048 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
3049
3050#ifdef CONFIG_MAC80211_MESH
3051 if (meshhdrlen > 0)
3052 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
3053#endif
3054
3055 if (ieee80211_is_data_qos(fc)) {
3056 __le16 *qos_control;
3057
3058 qos_control = skb_push(skb, 2);
3059 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
3060 /*
3061 * Maybe we could actually set some fields here, for now just
3062 * initialise to zero to indicate no special operation.
3063 */
3064 *qos_control = 0;
3065 } else
3066 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
3067
3068 skb_reset_mac_header(skb);
3069
3070 if (likely(!cookie)) {
3071 ctrl_flags |= u32_encode_bits(link_id,
3072 IEEE80211_TX_CTRL_MLO_LINK);
3073 } else {
3074 unsigned int pre_conf_link_id;
3075
3076 /*
3077 * ctrl_flags already have been set by
3078 * ieee80211_tx_control_port(), here
3079 * we just sanity check that
3080 */
3081
3082 pre_conf_link_id = u32_get_bits(ctrl_flags,
3083 IEEE80211_TX_CTRL_MLO_LINK);
3084
3085 if (pre_conf_link_id != link_id &&
3086 link_id != IEEE80211_LINK_UNSPECIFIED) {
3087#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
3088 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n",
3089 sdata->name, hdr.addr1,
3090 pre_conf_link_id, link_id);
3091#endif
3092 ret = -EINVAL;
3093 goto free_txskb;
3094 }
3095 }
3096
3097 info->control.flags = ctrl_flags;
3098
3099 return skb;
3100 free_txskb:
3101 ieee80211_free_txskb(&local->hw, skb);
3102 return ERR_PTR(ret);
3103 free:
3104 kfree_skb(skb);
3105 return ERR_PTR(ret);
3106}
3107
3108/*
3109 * fast-xmit overview
3110 *
3111 * The core idea of this fast-xmit is to remove per-packet checks by checking
3112 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
3113 * checks that are needed to get the sta->fast_tx pointer assigned, after which
3114 * much less work can be done per packet. For example, fragmentation must be
3115 * disabled or the fast_tx pointer will not be set. All the conditions are seen
3116 * in the code here.
3117 *
3118 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
3119 * header and other data to aid packet processing in ieee80211_xmit_fast().
3120 *
3121 * The most difficult part of this is that when any of these assumptions
3122 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
3123 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
3124 * since the per-packet code no longer checks the conditions. This is reflected
3125 * by the calls to these functions throughout the rest of the code, and must be
3126 * maintained if any of the TX path checks change.
3127 */
3128
3129void ieee80211_check_fast_xmit(struct sta_info *sta)
3130{
3131 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
3132 struct ieee80211_local *local = sta->local;
3133 struct ieee80211_sub_if_data *sdata = sta->sdata;
3134 struct ieee80211_hdr *hdr = (void *)build.hdr;
3135 struct ieee80211_chanctx_conf *chanctx_conf;
3136 __le16 fc;
3137
3138 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
3139 return;
3140
3141 if (ieee80211_vif_is_mesh(&sdata->vif))
3142 mesh_fast_tx_flush_sta(sdata, sta);
3143
3144 /* Locking here protects both the pointer itself, and against concurrent
3145 * invocations winning data access races to, e.g., the key pointer that
3146 * is used.
3147 * Without it, the invocation of this function right after the key
3148 * pointer changes wouldn't be sufficient, as another CPU could access
3149 * the pointer, then stall, and then do the cache update after the CPU
3150 * that invalidated the key.
3151 * With the locking, such scenarios cannot happen as the check for the
3152 * key and the fast-tx assignment are done atomically, so the CPU that
3153 * modifies the key will either wait or other one will see the key
3154 * cleared/changed already.
3155 */
3156 spin_lock_bh(&sta->lock);
3157 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3158 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3159 sdata->vif.type == NL80211_IFTYPE_STATION)
3160 goto out;
3161
3162 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded)
3163 goto out;
3164
3165 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
3166 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
3167 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
3168 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
3169 goto out;
3170
3171 if (sdata->noack_map)
3172 goto out;
3173
3174 /* fast-xmit doesn't handle fragmentation at all */
3175 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
3176 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
3177 goto out;
3178
3179 if (!ieee80211_vif_is_mld(&sdata->vif)) {
3180 rcu_read_lock();
3181 chanctx_conf =
3182 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
3183 if (!chanctx_conf) {
3184 rcu_read_unlock();
3185 goto out;
3186 }
3187 build.band = chanctx_conf->def.chan->band;
3188 rcu_read_unlock();
3189 } else {
3190 /* MLD transmissions must not rely on the band */
3191 build.band = 0;
3192 }
3193
3194 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
3195
3196 switch (sdata->vif.type) {
3197 case NL80211_IFTYPE_ADHOC:
3198 /* DA SA BSSID */
3199 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3200 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3201 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
3202 build.hdr_len = 24;
3203 break;
3204 case NL80211_IFTYPE_STATION:
3205 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
3206 /* For TDLS only one link can be valid with peer STA */
3207 int tdls_link_id = ieee80211_tdls_sta_link_id(sta);
3208 struct ieee80211_link_data *link;
3209
3210 /* DA SA BSSID */
3211 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3212 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3213 rcu_read_lock();
3214 link = rcu_dereference(sdata->link[tdls_link_id]);
3215 if (!WARN_ON_ONCE(!link))
3216 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN);
3217 rcu_read_unlock();
3218 build.hdr_len = 24;
3219 break;
3220 }
3221
3222 if (sdata->u.mgd.use_4addr) {
3223 /* non-regular ethertype cannot use the fastpath */
3224 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
3225 IEEE80211_FCTL_TODS);
3226 /* RA TA DA SA */
3227 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN);
3228 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3229 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3230 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3231 build.hdr_len = 30;
3232 break;
3233 }
3234 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
3235 /* BSSID SA DA */
3236 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN);
3237 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3238 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3239 build.hdr_len = 24;
3240 break;
3241 case NL80211_IFTYPE_AP_VLAN:
3242 if (sdata->wdev.use_4addr) {
3243 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
3244 IEEE80211_FCTL_TODS);
3245 /* RA TA DA SA */
3246 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
3247 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3248 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3249 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3250 build.hdr_len = 30;
3251 break;
3252 }
3253 fallthrough;
3254 case NL80211_IFTYPE_AP:
3255 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
3256 /* DA BSSID SA */
3257 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3258 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) {
3259 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3260 } else {
3261 unsigned int link_id = sta->deflink.link_id;
3262 struct ieee80211_link_data *link;
3263
3264 rcu_read_lock();
3265 link = rcu_dereference(sdata->link[link_id]);
3266 if (WARN_ON(!link)) {
3267 rcu_read_unlock();
3268 goto out;
3269 }
3270 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN);
3271 rcu_read_unlock();
3272 }
3273 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3274 build.hdr_len = 24;
3275 break;
3276 default:
3277 /* not handled on fast-xmit */
3278 goto out;
3279 }
3280
3281 if (sta->sta.wme) {
3282 build.hdr_len += 2;
3283 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
3284 }
3285
3286 /* We store the key here so there's no point in using rcu_dereference()
3287 * but that's fine because the code that changes the pointers will call
3288 * this function after doing so. For a single CPU that would be enough,
3289 * for multiple see the comment above.
3290 */
3291 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
3292 if (!build.key)
3293 build.key = rcu_access_pointer(sdata->default_unicast_key);
3294 if (build.key) {
3295 bool gen_iv, iv_spc, mmic;
3296
3297 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
3298 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
3299 mmic = build.key->conf.flags &
3300 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
3301 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
3302
3303 /* don't handle software crypto */
3304 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
3305 goto out;
3306
3307 /* Key is being removed */
3308 if (build.key->flags & KEY_FLAG_TAINTED)
3309 goto out;
3310
3311 switch (build.key->conf.cipher) {
3312 case WLAN_CIPHER_SUITE_CCMP:
3313 case WLAN_CIPHER_SUITE_CCMP_256:
3314 if (gen_iv)
3315 build.pn_offs = build.hdr_len;
3316 if (gen_iv || iv_spc)
3317 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
3318 break;
3319 case WLAN_CIPHER_SUITE_GCMP:
3320 case WLAN_CIPHER_SUITE_GCMP_256:
3321 if (gen_iv)
3322 build.pn_offs = build.hdr_len;
3323 if (gen_iv || iv_spc)
3324 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3325 break;
3326 case WLAN_CIPHER_SUITE_TKIP:
3327 /* cannot handle MMIC or IV generation in xmit-fast */
3328 if (mmic || gen_iv)
3329 goto out;
3330 if (iv_spc)
3331 build.hdr_len += IEEE80211_TKIP_IV_LEN;
3332 break;
3333 case WLAN_CIPHER_SUITE_WEP40:
3334 case WLAN_CIPHER_SUITE_WEP104:
3335 /* cannot handle IV generation in fast-xmit */
3336 if (gen_iv)
3337 goto out;
3338 if (iv_spc)
3339 build.hdr_len += IEEE80211_WEP_IV_LEN;
3340 break;
3341 case WLAN_CIPHER_SUITE_AES_CMAC:
3342 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3343 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3344 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3345 WARN(1,
3346 "management cipher suite 0x%x enabled for data\n",
3347 build.key->conf.cipher);
3348 goto out;
3349 default:
3350 /* we don't know how to generate IVs for this at all */
3351 if (WARN_ON(gen_iv))
3352 goto out;
3353 }
3354
3355 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3356 }
3357
3358 hdr->frame_control = fc;
3359
3360 memcpy(build.hdr + build.hdr_len,
3361 rfc1042_header, sizeof(rfc1042_header));
3362 build.hdr_len += sizeof(rfc1042_header);
3363
3364 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3365 /* if the kmemdup fails, continue w/o fast_tx */
3366
3367 out:
3368 /* we might have raced against another call to this function */
3369 old = rcu_dereference_protected(sta->fast_tx,
3370 lockdep_is_held(&sta->lock));
3371 rcu_assign_pointer(sta->fast_tx, fast_tx);
3372 if (old)
3373 kfree_rcu(old, rcu_head);
3374 spin_unlock_bh(&sta->lock);
3375}
3376
3377void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3378{
3379 struct sta_info *sta;
3380
3381 rcu_read_lock();
3382 list_for_each_entry_rcu(sta, &local->sta_list, list)
3383 ieee80211_check_fast_xmit(sta);
3384 rcu_read_unlock();
3385}
3386
3387void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3388{
3389 struct ieee80211_local *local = sdata->local;
3390 struct sta_info *sta;
3391
3392 rcu_read_lock();
3393
3394 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3395 if (sdata != sta->sdata &&
3396 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3397 continue;
3398 ieee80211_check_fast_xmit(sta);
3399 }
3400
3401 rcu_read_unlock();
3402}
3403
3404void ieee80211_clear_fast_xmit(struct sta_info *sta)
3405{
3406 struct ieee80211_fast_tx *fast_tx;
3407
3408 spin_lock_bh(&sta->lock);
3409 fast_tx = rcu_dereference_protected(sta->fast_tx,
3410 lockdep_is_held(&sta->lock));
3411 RCU_INIT_POINTER(sta->fast_tx, NULL);
3412 spin_unlock_bh(&sta->lock);
3413
3414 if (fast_tx)
3415 kfree_rcu(fast_tx, rcu_head);
3416}
3417
3418static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3419 struct sk_buff *skb, int headroom)
3420{
3421 if (skb_headroom(skb) < headroom) {
3422 I802_DEBUG_INC(local->tx_expand_skb_head);
3423
3424 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3425 wiphy_debug(local->hw.wiphy,
3426 "failed to reallocate TX buffer\n");
3427 return false;
3428 }
3429 }
3430
3431 return true;
3432}
3433
3434static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3435 struct ieee80211_fast_tx *fast_tx,
3436 struct sk_buff *skb)
3437{
3438 struct ieee80211_local *local = sdata->local;
3439 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3440 struct ieee80211_hdr *hdr;
3441 struct ethhdr *amsdu_hdr;
3442 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3443 int subframe_len = skb->len - hdr_len;
3444 void *data;
3445 u8 *qc, *h_80211_src, *h_80211_dst;
3446 const u8 *bssid;
3447
3448 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3449 return false;
3450
3451 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3452 return true;
3453
3454 if (!ieee80211_amsdu_realloc_pad(local, skb,
3455 sizeof(*amsdu_hdr) +
3456 local->hw.extra_tx_headroom))
3457 return false;
3458
3459 data = skb_push(skb, sizeof(*amsdu_hdr));
3460 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3461 hdr = data;
3462 amsdu_hdr = data + hdr_len;
3463 /* h_80211_src/dst is addr* field within hdr */
3464 h_80211_src = data + fast_tx->sa_offs;
3465 h_80211_dst = data + fast_tx->da_offs;
3466
3467 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3468 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3469 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3470
3471 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3472 * fields needs to be changed to BSSID for A-MSDU frames depending
3473 * on FromDS/ToDS values.
3474 */
3475 switch (sdata->vif.type) {
3476 case NL80211_IFTYPE_STATION:
3477 bssid = sdata->vif.cfg.ap_addr;
3478 break;
3479 case NL80211_IFTYPE_AP:
3480 case NL80211_IFTYPE_AP_VLAN:
3481 bssid = sdata->vif.addr;
3482 break;
3483 default:
3484 bssid = NULL;
3485 }
3486
3487 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3488 ether_addr_copy(h_80211_src, bssid);
3489
3490 if (bssid && ieee80211_has_tods(hdr->frame_control))
3491 ether_addr_copy(h_80211_dst, bssid);
3492
3493 qc = ieee80211_get_qos_ctl(hdr);
3494 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3495
3496 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3497
3498 return true;
3499}
3500
3501static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3502 struct sta_info *sta,
3503 struct ieee80211_fast_tx *fast_tx,
3504 struct sk_buff *skb,
3505 const u8 *da, const u8 *sa)
3506{
3507 struct ieee80211_local *local = sdata->local;
3508 struct fq *fq = &local->fq;
3509 struct fq_tin *tin;
3510 struct fq_flow *flow;
3511 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3512 struct ieee80211_txq *txq = sta->sta.txq[tid];
3513 struct txq_info *txqi;
3514 struct sk_buff **frag_tail, *head;
3515 int subframe_len = skb->len - ETH_ALEN;
3516 u8 max_subframes = sta->sta.max_amsdu_subframes;
3517 int max_frags = local->hw.max_tx_fragments;
3518 int max_amsdu_len = sta->sta.cur->max_amsdu_len;
3519 int orig_truesize;
3520 u32 flow_idx;
3521 __be16 len;
3522 void *data;
3523 bool ret = false;
3524 unsigned int orig_len;
3525 int n = 2, nfrags, pad = 0;
3526 u16 hdrlen;
3527
3528 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3529 return false;
3530
3531 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED)
3532 return false;
3533
3534 if (ieee80211_vif_is_mesh(&sdata->vif))
3535 return false;
3536
3537 if (skb_is_gso(skb))
3538 return false;
3539
3540 if (!txq)
3541 return false;
3542
3543 txqi = to_txq_info(txq);
3544 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3545 return false;
3546
3547 if (sta->sta.cur->max_rc_amsdu_len)
3548 max_amsdu_len = min_t(int, max_amsdu_len,
3549 sta->sta.cur->max_rc_amsdu_len);
3550
3551 if (sta->sta.cur->max_tid_amsdu_len[tid])
3552 max_amsdu_len = min_t(int, max_amsdu_len,
3553 sta->sta.cur->max_tid_amsdu_len[tid]);
3554
3555 flow_idx = fq_flow_idx(fq, skb);
3556
3557 spin_lock_bh(&fq->lock);
3558
3559 /* TODO: Ideally aggregation should be done on dequeue to remain
3560 * responsive to environment changes.
3561 */
3562
3563 tin = &txqi->tin;
3564 flow = fq_flow_classify(fq, tin, flow_idx, skb);
3565 head = skb_peek_tail(&flow->queue);
3566 if (!head || skb_is_gso(head))
3567 goto out;
3568
3569 orig_truesize = head->truesize;
3570 orig_len = head->len;
3571
3572 if (skb->len + head->len > max_amsdu_len)
3573 goto out;
3574
3575 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3576 nfrags += 1 + skb_shinfo(head)->nr_frags;
3577 frag_tail = &skb_shinfo(head)->frag_list;
3578 while (*frag_tail) {
3579 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3580 frag_tail = &(*frag_tail)->next;
3581 n++;
3582 }
3583
3584 if (max_subframes && n > max_subframes)
3585 goto out;
3586
3587 if (max_frags && nfrags > max_frags)
3588 goto out;
3589
3590 if (!drv_can_aggregate_in_amsdu(local, head, skb))
3591 goto out;
3592
3593 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3594 goto out;
3595
3596 /* If n == 2, the "while (*frag_tail)" loop above didn't execute
3597 * and frag_tail should be &skb_shinfo(head)->frag_list.
3598 * However, ieee80211_amsdu_prepare_head() can reallocate it.
3599 * Reload frag_tail to have it pointing to the correct place.
3600 */
3601 if (n == 2)
3602 frag_tail = &skb_shinfo(head)->frag_list;
3603
3604 /*
3605 * Pad out the previous subframe to a multiple of 4 by adding the
3606 * padding to the next one, that's being added. Note that head->len
3607 * is the length of the full A-MSDU, but that works since each time
3608 * we add a new subframe we pad out the previous one to a multiple
3609 * of 4 and thus it no longer matters in the next round.
3610 */
3611 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3612 if ((head->len - hdrlen) & 3)
3613 pad = 4 - ((head->len - hdrlen) & 3);
3614
3615 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3616 2 + pad))
3617 goto out_recalc;
3618
3619 ret = true;
3620 data = skb_push(skb, ETH_ALEN + 2);
3621 ether_addr_copy(data, da);
3622 ether_addr_copy(data + ETH_ALEN, sa);
3623
3624 data += 2 * ETH_ALEN;
3625 len = cpu_to_be16(subframe_len);
3626 memcpy(data, &len, 2);
3627 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3628
3629 memset(skb_push(skb, pad), 0, pad);
3630
3631 head->len += skb->len;
3632 head->data_len += skb->len;
3633 *frag_tail = skb;
3634
3635out_recalc:
3636 fq->memory_usage += head->truesize - orig_truesize;
3637 if (head->len != orig_len) {
3638 flow->backlog += head->len - orig_len;
3639 tin->backlog_bytes += head->len - orig_len;
3640 }
3641out:
3642 spin_unlock_bh(&fq->lock);
3643
3644 return ret;
3645}
3646
3647/*
3648 * Can be called while the sta lock is held. Anything that can cause packets to
3649 * be generated will cause deadlock!
3650 */
3651static ieee80211_tx_result
3652ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3653 struct sta_info *sta, u8 pn_offs,
3654 struct ieee80211_key *key,
3655 struct ieee80211_tx_data *tx)
3656{
3657 struct sk_buff *skb = tx->skb;
3658 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3659 struct ieee80211_hdr *hdr = (void *)skb->data;
3660 u8 tid = IEEE80211_NUM_TIDS;
3661
3662 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) &&
3663 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE)
3664 return TX_DROP;
3665
3666 if (key)
3667 info->control.hw_key = &key->conf;
3668
3669 dev_sw_netstats_tx_add(skb->dev, 1, skb->len);
3670
3671 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3672 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3673 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3674 } else {
3675 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3676 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3677 sdata->sequence_number += 0x10;
3678 }
3679
3680 if (skb_shinfo(skb)->gso_size)
3681 sta->deflink.tx_stats.msdu[tid] +=
3682 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3683 else
3684 sta->deflink.tx_stats.msdu[tid]++;
3685
3686 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3687
3688 /* statistics normally done by ieee80211_tx_h_stats (but that
3689 * has to consider fragmentation, so is more complex)
3690 */
3691 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3692 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++;
3693
3694 if (pn_offs) {
3695 u64 pn;
3696 u8 *crypto_hdr = skb->data + pn_offs;
3697
3698 switch (key->conf.cipher) {
3699 case WLAN_CIPHER_SUITE_CCMP:
3700 case WLAN_CIPHER_SUITE_CCMP_256:
3701 case WLAN_CIPHER_SUITE_GCMP:
3702 case WLAN_CIPHER_SUITE_GCMP_256:
3703 pn = atomic64_inc_return(&key->conf.tx_pn);
3704 crypto_hdr[0] = pn;
3705 crypto_hdr[1] = pn >> 8;
3706 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6);
3707 crypto_hdr[4] = pn >> 16;
3708 crypto_hdr[5] = pn >> 24;
3709 crypto_hdr[6] = pn >> 32;
3710 crypto_hdr[7] = pn >> 40;
3711 break;
3712 }
3713 }
3714
3715 return TX_CONTINUE;
3716}
3717
3718static netdev_features_t
3719ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata)
3720{
3721 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3722 return sdata->vif.netdev_features;
3723
3724 if (!sdata->bss)
3725 return 0;
3726
3727 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
3728 return sdata->vif.netdev_features;
3729}
3730
3731static struct sk_buff *
3732ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features)
3733{
3734 if (skb_is_gso(skb)) {
3735 struct sk_buff *segs;
3736
3737 segs = skb_gso_segment(skb, features);
3738 if (!segs)
3739 return skb;
3740 if (IS_ERR(segs))
3741 goto free;
3742
3743 consume_skb(skb);
3744 return segs;
3745 }
3746
3747 if (skb_needs_linearize(skb, features) && __skb_linearize(skb))
3748 goto free;
3749
3750 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3751 int ofs = skb_checksum_start_offset(skb);
3752
3753 if (skb->encapsulation)
3754 skb_set_inner_transport_header(skb, ofs);
3755 else
3756 skb_set_transport_header(skb, ofs);
3757
3758 if (skb_csum_hwoffload_help(skb, features))
3759 goto free;
3760 }
3761
3762 skb_mark_not_on_list(skb);
3763 return skb;
3764
3765free:
3766 kfree_skb(skb);
3767 return NULL;
3768}
3769
3770void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3771 struct sta_info *sta,
3772 struct ieee80211_fast_tx *fast_tx,
3773 struct sk_buff *skb, bool ampdu,
3774 const u8 *da, const u8 *sa)
3775{
3776 struct ieee80211_local *local = sdata->local;
3777 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3778 struct ieee80211_tx_info *info;
3779 struct ieee80211_tx_data tx;
3780 ieee80211_tx_result r;
3781 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3782 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3783
3784 skb = skb_share_check(skb, GFP_ATOMIC);
3785 if (unlikely(!skb))
3786 return;
3787
3788 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3789 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa))
3790 return;
3791
3792 /* will not be crypto-handled beyond what we do here, so use false
3793 * as the may-encrypt argument for the resize to not account for
3794 * more room than we already have in 'extra_head'
3795 */
3796 if (unlikely(ieee80211_skb_resize(sdata, skb,
3797 max_t(int, extra_head + hw_headroom -
3798 skb_headroom(skb), 0),
3799 ENCRYPT_NO)))
3800 goto free;
3801
3802 hdr = skb_push(skb, extra_head);
3803 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3804 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN);
3805 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN);
3806
3807 info = IEEE80211_SKB_CB(skb);
3808 memset(info, 0, sizeof(*info));
3809 info->band = fast_tx->band;
3810 info->control.vif = &sdata->vif;
3811 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3812 IEEE80211_TX_CTL_DONTFRAG;
3813 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT |
3814 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED,
3815 IEEE80211_TX_CTRL_MLO_LINK);
3816
3817#ifdef CONFIG_MAC80211_DEBUGFS
3818 if (local->force_tx_status)
3819 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
3820#endif
3821
3822 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3823 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3824
3825 *ieee80211_get_qos_ctl(hdr) = tid;
3826 }
3827
3828 __skb_queue_head_init(&tx.skbs);
3829
3830 tx.flags = IEEE80211_TX_UNICAST;
3831 tx.local = local;
3832 tx.sdata = sdata;
3833 tx.sta = sta;
3834 tx.key = fast_tx->key;
3835
3836 if (ieee80211_queue_skb(local, sdata, sta, skb))
3837 return;
3838
3839 tx.skb = skb;
3840 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3841 fast_tx->key, &tx);
3842 tx.skb = NULL;
3843 if (r == TX_DROP) {
3844 tx.sdata->tx_handlers_drop++;
3845 goto free;
3846 }
3847
3848 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3849 sdata = container_of(sdata->bss,
3850 struct ieee80211_sub_if_data, u.ap);
3851
3852 __skb_queue_tail(&tx.skbs, skb);
3853 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false);
3854 return;
3855
3856free:
3857 kfree_skb(skb);
3858}
3859
3860static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3861 struct sta_info *sta,
3862 struct ieee80211_fast_tx *fast_tx,
3863 struct sk_buff *skb)
3864{
3865 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3866 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3867 struct tid_ampdu_tx *tid_tx = NULL;
3868 struct sk_buff *next;
3869 struct ethhdr eth;
3870 u8 tid = IEEE80211_NUM_TIDS;
3871
3872 /* control port protocol needs a lot of special handling */
3873 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3874 return false;
3875
3876 /* only RFC 1042 SNAP */
3877 if (ethertype < ETH_P_802_3_MIN)
3878 return false;
3879
3880 /* don't handle TX status request here either */
3881 if (sk_requests_wifi_status(skb->sk))
3882 return false;
3883
3884 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3885 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3886 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3887 if (tid_tx) {
3888 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3889 return false;
3890 if (tid_tx->timeout)
3891 tid_tx->last_tx = jiffies;
3892 }
3893 }
3894
3895 memcpy(&eth, skb->data, ETH_HLEN - 2);
3896
3897 /* after this point (skb is modified) we cannot return false */
3898 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata));
3899 if (!skb)
3900 return true;
3901
3902 skb_list_walk_safe(skb, skb, next) {
3903 skb_mark_not_on_list(skb);
3904 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx,
3905 eth.h_dest, eth.h_source);
3906 }
3907
3908 return true;
3909}
3910
3911struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3912 struct ieee80211_txq *txq)
3913{
3914 struct ieee80211_local *local = hw_to_local(hw);
3915 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3916 struct ieee80211_hdr *hdr;
3917 struct sk_buff *skb = NULL;
3918 struct fq *fq = &local->fq;
3919 struct fq_tin *tin = &txqi->tin;
3920 struct ieee80211_tx_info *info;
3921 struct ieee80211_tx_data tx;
3922 ieee80211_tx_result r;
3923 struct ieee80211_vif *vif = txq->vif;
3924 int q = vif->hw_queue[txq->ac];
3925 unsigned long flags;
3926 bool q_stopped;
3927
3928 WARN_ON_ONCE(softirq_count() == 0);
3929
3930 if (!ieee80211_txq_airtime_check(hw, txq))
3931 return NULL;
3932
3933begin:
3934 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3935 q_stopped = local->queue_stop_reasons[q];
3936 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3937
3938 if (unlikely(q_stopped)) {
3939 /* mark for waking later */
3940 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags);
3941 return NULL;
3942 }
3943
3944 spin_lock_bh(&fq->lock);
3945
3946 /* Make sure fragments stay together. */
3947 skb = __skb_dequeue(&txqi->frags);
3948 if (unlikely(skb)) {
3949 if (!(IEEE80211_SKB_CB(skb)->control.flags &
3950 IEEE80211_TX_INTCFL_NEED_TXPROCESSING))
3951 goto out;
3952 IEEE80211_SKB_CB(skb)->control.flags &=
3953 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
3954 } else {
3955 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags)))
3956 goto out;
3957
3958 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3959 }
3960
3961 if (!skb)
3962 goto out;
3963
3964 spin_unlock_bh(&fq->lock);
3965
3966 hdr = (struct ieee80211_hdr *)skb->data;
3967 info = IEEE80211_SKB_CB(skb);
3968
3969 memset(&tx, 0, sizeof(tx));
3970 __skb_queue_head_init(&tx.skbs);
3971 tx.local = local;
3972 tx.skb = skb;
3973 tx.sdata = vif_to_sdata(info->control.vif);
3974
3975 if (txq->sta) {
3976 tx.sta = container_of(txq->sta, struct sta_info, sta);
3977 /*
3978 * Drop unicast frames to unauthorised stations unless they are
3979 * injected frames or EAPOL frames from the local station.
3980 */
3981 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
3982 ieee80211_is_data_present(hdr->frame_control) &&
3983 !ieee80211_vif_is_mesh(&tx.sdata->vif) &&
3984 tx.sdata->vif.type != NL80211_IFTYPE_OCB &&
3985 !is_multicast_ether_addr(hdr->addr1) &&
3986 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) &&
3987 (!(info->control.flags &
3988 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) ||
3989 !ieee80211_is_our_addr(tx.sdata, hdr->addr2,
3990 NULL)))) {
3991 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
3992 ieee80211_free_txskb(&local->hw, skb);
3993 goto begin;
3994 }
3995 }
3996
3997 /*
3998 * The key can be removed while the packet was queued, so need to call
3999 * this here to get the current key.
4000 */
4001 info->control.hw_key = NULL;
4002 r = ieee80211_tx_h_select_key(&tx);
4003 if (r != TX_CONTINUE) {
4004 ieee80211_free_txskb(&local->hw, skb);
4005 goto begin;
4006 }
4007
4008 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
4009 info->flags |= (IEEE80211_TX_CTL_AMPDU |
4010 IEEE80211_TX_CTL_DONTFRAG);
4011
4012 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
4013 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
4014 r = ieee80211_tx_h_rate_ctrl(&tx);
4015 if (r != TX_CONTINUE) {
4016 ieee80211_free_txskb(&local->hw, skb);
4017 goto begin;
4018 }
4019 }
4020 goto encap_out;
4021 }
4022
4023 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
4024 struct sta_info *sta = container_of(txq->sta, struct sta_info,
4025 sta);
4026 u8 pn_offs = 0;
4027
4028 if (tx.key &&
4029 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
4030 pn_offs = ieee80211_hdrlen(hdr->frame_control);
4031
4032 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
4033 tx.key, &tx);
4034 if (r != TX_CONTINUE) {
4035 ieee80211_free_txskb(&local->hw, skb);
4036 goto begin;
4037 }
4038 } else {
4039 if (invoke_tx_handlers_late(&tx))
4040 goto begin;
4041
4042 skb = __skb_dequeue(&tx.skbs);
4043 info = IEEE80211_SKB_CB(skb);
4044
4045 if (!skb_queue_empty(&tx.skbs)) {
4046 spin_lock_bh(&fq->lock);
4047 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
4048 spin_unlock_bh(&fq->lock);
4049 }
4050 }
4051
4052 if (skb_has_frag_list(skb) &&
4053 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
4054 if (skb_linearize(skb)) {
4055 ieee80211_free_txskb(&local->hw, skb);
4056 goto begin;
4057 }
4058 }
4059
4060 switch (tx.sdata->vif.type) {
4061 case NL80211_IFTYPE_MONITOR:
4062 if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) ||
4063 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) {
4064 vif = &tx.sdata->vif;
4065 break;
4066 }
4067 tx.sdata = rcu_dereference(local->monitor_sdata);
4068 if (tx.sdata &&
4069 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) {
4070 vif = &tx.sdata->vif;
4071 info->hw_queue =
4072 vif->hw_queue[skb_get_queue_mapping(skb)];
4073 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
4074 ieee80211_free_txskb(&local->hw, skb);
4075 goto begin;
4076 } else {
4077 info->control.vif = NULL;
4078 return skb;
4079 }
4080 break;
4081 case NL80211_IFTYPE_AP_VLAN:
4082 tx.sdata = container_of(tx.sdata->bss,
4083 struct ieee80211_sub_if_data, u.ap);
4084 fallthrough;
4085 default:
4086 vif = &tx.sdata->vif;
4087 break;
4088 }
4089
4090encap_out:
4091 info->control.vif = vif;
4092
4093 if (wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) {
4094 bool ampdu = txq->sta && txq->ac != IEEE80211_AC_VO;
4095 u32 airtime;
4096
4097 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta,
4098 skb->len, ampdu);
4099 if (!airtime)
4100 return skb;
4101
4102 airtime = ieee80211_info_set_tx_time_est(info, airtime);
4103 info->tx_time_mc = !tx.sta;
4104 ieee80211_sta_update_pending_airtime(local, tx.sta, txq->ac,
4105 airtime, false,
4106 info->tx_time_mc);
4107 }
4108
4109 return skb;
4110
4111out:
4112 spin_unlock_bh(&fq->lock);
4113
4114 return skb;
4115}
4116EXPORT_SYMBOL(ieee80211_tx_dequeue);
4117
4118static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac)
4119{
4120 struct airtime_info *air_info = &sta->airtime[ac];
4121
4122 return air_info->deficit - atomic_read(&air_info->aql_tx_pending);
4123}
4124
4125static void
4126ieee80211_txq_set_active(struct txq_info *txqi)
4127{
4128 struct sta_info *sta;
4129
4130 if (!txqi->txq.sta)
4131 return;
4132
4133 sta = container_of(txqi->txq.sta, struct sta_info, sta);
4134 sta->airtime[txqi->txq.ac].last_active = jiffies;
4135}
4136
4137static bool
4138ieee80211_txq_keep_active(struct txq_info *txqi)
4139{
4140 struct sta_info *sta;
4141
4142 if (!txqi->txq.sta)
4143 return false;
4144
4145 sta = container_of(txqi->txq.sta, struct sta_info, sta);
4146 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0)
4147 return false;
4148
4149 return ieee80211_sta_keep_active(sta, txqi->txq.ac);
4150}
4151
4152struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
4153{
4154 struct ieee80211_local *local = hw_to_local(hw);
4155 struct ieee80211_txq *ret = NULL;
4156 struct txq_info *txqi = NULL, *head = NULL;
4157 bool found_eligible_txq = false;
4158 bool aql_check;
4159
4160 spin_lock_bh(&local->active_txq_lock[ac]);
4161
4162 if (!local->schedule_round[ac])
4163 goto out;
4164
4165 begin:
4166 txqi = list_first_entry_or_null(&local->active_txqs[ac],
4167 struct txq_info,
4168 schedule_order);
4169 if (!txqi)
4170 goto out;
4171
4172 if (txqi == head) {
4173 if (!found_eligible_txq)
4174 goto out;
4175 else
4176 found_eligible_txq = false;
4177 }
4178
4179 if (!head)
4180 head = txqi;
4181
4182 aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq);
4183 if (aql_check)
4184 found_eligible_txq = true;
4185
4186 if (txqi->txq.sta) {
4187 struct sta_info *sta = container_of(txqi->txq.sta,
4188 struct sta_info, sta);
4189
4190 if (ieee80211_sta_deficit(sta, txqi->txq.ac) < 0) {
4191 sta->airtime[txqi->txq.ac].deficit +=
4192 sta->airtime_weight;
4193
4194 aql_check = false;
4195 }
4196 }
4197
4198 if (!aql_check) {
4199 list_move_tail(&txqi->schedule_order,
4200 &local->active_txqs[txqi->txq.ac]);
4201 goto begin;
4202 }
4203
4204 if (txqi->schedule_round == local->schedule_round[ac])
4205 goto out;
4206
4207 list_del_init(&txqi->schedule_order);
4208 txqi->schedule_round = local->schedule_round[ac];
4209 ret = &txqi->txq;
4210
4211out:
4212 spin_unlock_bh(&local->active_txq_lock[ac]);
4213 return ret;
4214}
4215EXPORT_SYMBOL(ieee80211_next_txq);
4216
4217void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
4218 struct ieee80211_txq *txq,
4219 bool force)
4220{
4221 struct ieee80211_local *local = hw_to_local(hw);
4222 struct txq_info *txqi = to_txq_info(txq);
4223 bool has_queue;
4224
4225 spin_lock_bh(&local->active_txq_lock[txq->ac]);
4226
4227 has_queue = force ||
4228 (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) &&
4229 txq_has_queue(txq));
4230 if (list_empty(&txqi->schedule_order) &&
4231 (has_queue || ieee80211_txq_keep_active(txqi))) {
4232 /* If airtime accounting is active, always enqueue STAs at the
4233 * head of the list to ensure that they only get moved to the
4234 * back by the airtime DRR scheduler once they have a negative
4235 * deficit. A station that already has a negative deficit will
4236 * get immediately moved to the back of the list on the next
4237 * call to ieee80211_next_txq().
4238 */
4239 if (txqi->txq.sta && local->airtime_flags && has_queue &&
4240 wiphy_ext_feature_isset(local->hw.wiphy,
4241 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
4242 list_add(&txqi->schedule_order,
4243 &local->active_txqs[txq->ac]);
4244 else
4245 list_add_tail(&txqi->schedule_order,
4246 &local->active_txqs[txq->ac]);
4247 if (has_queue)
4248 ieee80211_txq_set_active(txqi);
4249 }
4250
4251 spin_unlock_bh(&local->active_txq_lock[txq->ac]);
4252}
4253EXPORT_SYMBOL(__ieee80211_schedule_txq);
4254
4255DEFINE_STATIC_KEY_FALSE(aql_disable);
4256
4257bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw,
4258 struct ieee80211_txq *txq)
4259{
4260 struct sta_info *sta;
4261 struct ieee80211_local *local = hw_to_local(hw);
4262
4263 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
4264 return true;
4265
4266 if (static_branch_unlikely(&aql_disable))
4267 return true;
4268
4269 if (!txq->sta)
4270 return atomic_read(&local->aql_mc_pending_airtime) <
4271 local->aql_txq_limit_mc;
4272
4273 if (unlikely(txq->tid == IEEE80211_NUM_TIDS))
4274 return true;
4275
4276 sta = container_of(txq->sta, struct sta_info, sta);
4277 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
4278 sta->airtime[txq->ac].aql_limit_low)
4279 return true;
4280
4281 if (atomic_read(&local->aql_total_pending_airtime) <
4282 local->aql_threshold &&
4283 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
4284 sta->airtime[txq->ac].aql_limit_high)
4285 return true;
4286
4287 return false;
4288}
4289EXPORT_SYMBOL(ieee80211_txq_airtime_check);
4290
4291u32 ieee80211_txq_aql_pending(struct ieee80211_hw *hw,
4292 struct ieee80211_txq *txq)
4293{
4294 struct ieee80211_local *local = hw_to_local(hw);
4295 struct sta_info *sta;
4296
4297 if (unlikely(txq->tid == IEEE80211_NUM_TIDS))
4298 return 0;
4299
4300 if (!txq->sta)
4301 return atomic_read(&local->aql_mc_pending_airtime);
4302
4303 sta = container_of(txq->sta, struct sta_info, sta);
4304
4305 return atomic_read(&sta->airtime[txq->ac].aql_tx_pending);
4306}
4307EXPORT_SYMBOL(ieee80211_txq_aql_pending);
4308
4309static bool
4310ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac)
4311{
4312 unsigned int num_txq = 0;
4313 struct txq_info *txq;
4314 u32 aql_limit;
4315
4316 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
4317 return true;
4318
4319 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order)
4320 num_txq++;
4321
4322 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 +
4323 local->aql_txq_limit_high[ac];
4324
4325 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit;
4326}
4327
4328bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw,
4329 struct ieee80211_txq *txq)
4330{
4331 struct ieee80211_local *local = hw_to_local(hw);
4332 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq);
4333 struct sta_info *sta;
4334 u8 ac = txq->ac;
4335
4336 spin_lock_bh(&local->active_txq_lock[ac]);
4337
4338 if (list_empty(&txqi->schedule_order))
4339 goto out;
4340
4341 if (!ieee80211_txq_schedule_airtime_check(local, ac))
4342 goto out;
4343
4344 if (!txqi->txq.sta)
4345 goto out;
4346
4347 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac],
4348 schedule_order) {
4349 if (iter == txqi)
4350 break;
4351
4352 if (!iter->txq.sta) {
4353 list_move_tail(&iter->schedule_order,
4354 &local->active_txqs[ac]);
4355 continue;
4356 }
4357 sta = container_of(iter->txq.sta, struct sta_info, sta);
4358 if (ieee80211_sta_deficit(sta, ac) < 0)
4359 sta->airtime[ac].deficit += sta->airtime_weight;
4360 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]);
4361 }
4362
4363 sta = container_of(txqi->txq.sta, struct sta_info, sta);
4364 if (sta->airtime[ac].deficit >= 0)
4365 goto out;
4366
4367 sta->airtime[ac].deficit += sta->airtime_weight;
4368 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]);
4369 spin_unlock_bh(&local->active_txq_lock[ac]);
4370
4371 return false;
4372out:
4373 if (!list_empty(&txqi->schedule_order))
4374 list_del_init(&txqi->schedule_order);
4375 spin_unlock_bh(&local->active_txq_lock[ac]);
4376
4377 return true;
4378}
4379EXPORT_SYMBOL(ieee80211_txq_may_transmit);
4380
4381void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac)
4382{
4383 struct ieee80211_local *local = hw_to_local(hw);
4384
4385 spin_lock_bh(&local->active_txq_lock[ac]);
4386
4387 if (ieee80211_txq_schedule_airtime_check(local, ac)) {
4388 local->schedule_round[ac]++;
4389 if (!local->schedule_round[ac])
4390 local->schedule_round[ac]++;
4391 } else {
4392 local->schedule_round[ac] = 0;
4393 }
4394
4395 spin_unlock_bh(&local->active_txq_lock[ac]);
4396}
4397EXPORT_SYMBOL(ieee80211_txq_schedule_start);
4398
4399void __ieee80211_subif_start_xmit(struct sk_buff *skb,
4400 struct net_device *dev,
4401 u32 info_flags,
4402 u32 ctrl_flags,
4403 u64 cookie)
4404{
4405 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4406 struct ieee80211_local *local = sdata->local;
4407 struct sta_info *sta;
4408 struct sk_buff *next;
4409 int len = skb->len;
4410
4411 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) {
4412 kfree_skb(skb);
4413 return;
4414 }
4415
4416 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
4417
4418 rcu_read_lock();
4419
4420 if (ieee80211_vif_is_mesh(&sdata->vif) &&
4421 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) &&
4422 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags))
4423 goto out;
4424
4425 if (ieee80211_lookup_ra_sta(sdata, skb, &sta,
4426 skb->protocol == sdata->control_port_protocol))
4427 goto out_free;
4428
4429 if (IS_ERR(sta))
4430 sta = NULL;
4431
4432 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb));
4433 ieee80211_aggr_check(sdata, sta, skb);
4434
4435 if (sta) {
4436 struct ieee80211_fast_tx *fast_tx;
4437
4438 fast_tx = rcu_dereference(sta->fast_tx);
4439
4440 if (fast_tx &&
4441 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
4442 goto out;
4443 }
4444
4445 /* the frame could be fragmented, software-encrypted, and other
4446 * things so we cannot really handle checksum or GSO offload.
4447 * fix it up in software before we handle anything else.
4448 */
4449 skb = ieee80211_tx_skb_fixup(skb, 0);
4450 if (!skb) {
4451 len = 0;
4452 goto out;
4453 }
4454
4455 skb_list_walk_safe(skb, skb, next) {
4456 skb_mark_not_on_list(skb);
4457
4458 if (skb->protocol == sdata->control_port_protocol)
4459 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
4460
4461 skb = ieee80211_build_hdr(sdata, skb, info_flags,
4462 sta, ctrl_flags, cookie);
4463 if (IS_ERR(skb)) {
4464 kfree_skb_list(next);
4465 goto out;
4466 }
4467
4468 dev_sw_netstats_tx_add(dev, 1, skb->len);
4469
4470 ieee80211_xmit(sdata, sta, skb);
4471 }
4472 goto out;
4473 out_free:
4474 kfree_skb(skb);
4475 len = 0;
4476 out:
4477 if (len)
4478 ieee80211_tpt_led_trig_tx(local, len);
4479 rcu_read_unlock();
4480}
4481
4482static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
4483{
4484 struct ethhdr *eth;
4485 int err;
4486
4487 err = skb_ensure_writable(skb, ETH_HLEN);
4488 if (unlikely(err))
4489 return err;
4490
4491 eth = (void *)skb->data;
4492 ether_addr_copy(eth->h_dest, sta->sta.addr);
4493
4494 return 0;
4495}
4496
4497static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
4498 struct net_device *dev)
4499{
4500 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4501 const struct ethhdr *eth = (void *)skb->data;
4502 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
4503 __be16 ethertype;
4504
4505 switch (sdata->vif.type) {
4506 case NL80211_IFTYPE_AP_VLAN:
4507 if (sdata->u.vlan.sta)
4508 return false;
4509 if (sdata->wdev.use_4addr)
4510 return false;
4511 fallthrough;
4512 case NL80211_IFTYPE_AP:
4513 /* check runtime toggle for this bss */
4514 if (!sdata->bss->multicast_to_unicast)
4515 return false;
4516 break;
4517 default:
4518 return false;
4519 }
4520
4521 /* multicast to unicast conversion only for some payload */
4522 ethertype = eth->h_proto;
4523 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
4524 ethertype = ethvlan->h_vlan_encapsulated_proto;
4525 switch (ethertype) {
4526 case htons(ETH_P_ARP):
4527 case htons(ETH_P_IP):
4528 case htons(ETH_P_IPV6):
4529 break;
4530 default:
4531 return false;
4532 }
4533
4534 return true;
4535}
4536
4537static void
4538ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
4539 struct sk_buff_head *queue)
4540{
4541 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4542 struct ieee80211_local *local = sdata->local;
4543 const struct ethhdr *eth = (struct ethhdr *)skb->data;
4544 struct sta_info *sta, *first = NULL;
4545 struct sk_buff *cloned_skb;
4546
4547 rcu_read_lock();
4548
4549 list_for_each_entry_rcu(sta, &local->sta_list, list) {
4550 if (sdata != sta->sdata)
4551 /* AP-VLAN mismatch */
4552 continue;
4553 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
4554 /* do not send back to source */
4555 continue;
4556 if (!first) {
4557 first = sta;
4558 continue;
4559 }
4560 cloned_skb = skb_clone(skb, GFP_ATOMIC);
4561 if (!cloned_skb)
4562 goto multicast;
4563 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
4564 dev_kfree_skb(cloned_skb);
4565 goto multicast;
4566 }
4567 __skb_queue_tail(queue, cloned_skb);
4568 }
4569
4570 if (likely(first)) {
4571 if (unlikely(ieee80211_change_da(skb, first)))
4572 goto multicast;
4573 __skb_queue_tail(queue, skb);
4574 } else {
4575 /* no STA connected, drop */
4576 kfree_skb(skb);
4577 skb = NULL;
4578 }
4579
4580 goto out;
4581multicast:
4582 __skb_queue_purge(queue);
4583 __skb_queue_tail(queue, skb);
4584out:
4585 rcu_read_unlock();
4586}
4587
4588static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata,
4589 struct sk_buff *skb, u32 ctrl_flags,
4590 unsigned int link_id)
4591{
4592 struct sk_buff *out;
4593
4594 out = skb_copy(skb, GFP_ATOMIC);
4595 if (!out)
4596 return;
4597
4598 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK);
4599 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, 0);
4600}
4601
4602static void ieee80211_mlo_multicast_tx(struct net_device *dev,
4603 struct sk_buff *skb)
4604{
4605 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4606 unsigned long links = sdata->vif.active_links;
4607 unsigned int link;
4608 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX;
4609
4610 if (hweight16(links) == 1) {
4611 ctrl_flags |= u32_encode_bits(__ffs(links),
4612 IEEE80211_TX_CTRL_MLO_LINK);
4613
4614 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 0);
4615 return;
4616 }
4617
4618 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) {
4619 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link);
4620 ctrl_flags = 0;
4621 }
4622 kfree_skb(skb);
4623}
4624
4625/**
4626 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
4627 * @skb: packet to be sent
4628 * @dev: incoming interface
4629 *
4630 * On failure skb will be freed.
4631 *
4632 * Returns: the netdev TX status (but really only %NETDEV_TX_OK)
4633 */
4634netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
4635 struct net_device *dev)
4636{
4637 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4638 const struct ethhdr *eth = (void *)skb->data;
4639
4640 if (likely(!is_multicast_ether_addr(eth->h_dest)))
4641 goto normal;
4642
4643 if (unlikely(!ieee80211_sdata_running(sdata))) {
4644 kfree_skb(skb);
4645 return NETDEV_TX_OK;
4646 }
4647
4648 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
4649 struct sk_buff_head queue;
4650
4651 __skb_queue_head_init(&queue);
4652 ieee80211_convert_to_unicast(skb, dev, &queue);
4653 while ((skb = __skb_dequeue(&queue)))
4654 __ieee80211_subif_start_xmit(skb, dev, 0,
4655 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4656 0);
4657 } else if (ieee80211_vif_is_mld(&sdata->vif) &&
4658 ((sdata->vif.type == NL80211_IFTYPE_AP &&
4659 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) ||
4660 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4661 !sdata->wdev.use_4addr))) {
4662 ieee80211_mlo_multicast_tx(dev, skb);
4663 } else {
4664normal:
4665 __ieee80211_subif_start_xmit(skb, dev, 0,
4666 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4667 0);
4668 }
4669
4670 return NETDEV_TX_OK;
4671}
4672
4673
4674
4675static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
4676 struct sk_buff *skb, struct sta_info *sta,
4677 bool txpending)
4678{
4679 struct ieee80211_local *local = sdata->local;
4680 struct ieee80211_tx_control control = {};
4681 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4682 struct ieee80211_sta *pubsta = NULL;
4683 unsigned long flags;
4684 int q = info->hw_queue;
4685
4686 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4687
4688 if (local->queue_stop_reasons[q] ||
4689 (!txpending && !skb_queue_empty(&local->pending[q]))) {
4690 if (txpending)
4691 skb_queue_head(&local->pending[q], skb);
4692 else
4693 skb_queue_tail(&local->pending[q], skb);
4694
4695 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4696
4697 return false;
4698 }
4699
4700 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4701
4702 if (sta && sta->uploaded)
4703 pubsta = &sta->sta;
4704
4705 control.sta = pubsta;
4706
4707 drv_tx(local, &control, skb);
4708
4709 return true;
4710}
4711
4712static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
4713 struct sk_buff *skb, struct sta_info *sta,
4714 bool txpending)
4715{
4716 struct ieee80211_local *local = sdata->local;
4717 struct sk_buff *next;
4718 bool ret = true;
4719
4720 if (ieee80211_queue_skb(local, sdata, sta, skb))
4721 return true;
4722
4723 skb_list_walk_safe(skb, skb, next) {
4724 skb_mark_not_on_list(skb);
4725 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending))
4726 ret = false;
4727 }
4728
4729 return ret;
4730}
4731
4732static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
4733 struct net_device *dev, struct sta_info *sta,
4734 struct ieee80211_key *key, struct sk_buff *skb)
4735{
4736 struct ieee80211_tx_info *info;
4737 struct ieee80211_local *local = sdata->local;
4738 struct ieee80211_chanctx_conf *chanctx_conf;
4739 struct tid_ampdu_tx *tid_tx = NULL;
4740 struct sk_buff *seg, *next;
4741 unsigned int skbs = 0, len = 0;
4742 u16 queue;
4743 u8 tid;
4744
4745 queue = ieee80211_select_queue(sdata, sta, skb);
4746 skb_set_queue_mapping(skb, queue);
4747
4748 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) &&
4749 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
4750 goto out_free;
4751
4752 skb = skb_share_check(skb, GFP_ATOMIC);
4753 if (unlikely(!skb))
4754 return;
4755
4756 ieee80211_aggr_check(sdata, sta, skb);
4757
4758 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
4759
4760 if (sta)
4761 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
4762 if (tid_tx) {
4763 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
4764 /* fall back to non-offload slow path */
4765 __ieee80211_subif_start_xmit(skb, dev, 0,
4766 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4767 0);
4768 return;
4769 }
4770
4771 if (tid_tx->timeout)
4772 tid_tx->last_tx = jiffies;
4773 }
4774
4775 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata));
4776 if (!skb)
4777 return;
4778
4779 info = IEEE80211_SKB_CB(skb);
4780 memset(info, 0, sizeof(*info));
4781
4782 info->hw_queue = sdata->vif.hw_queue[queue];
4783
4784 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4785 sdata = container_of(sdata->bss,
4786 struct ieee80211_sub_if_data, u.ap);
4787
4788 /* MLD transmissions must not rely on the band */
4789 if (!ieee80211_vif_is_mld(&sdata->vif)) {
4790 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
4791 if (unlikely(!chanctx_conf)) {
4792 kfree_skb_list(skb);
4793 return;
4794 }
4795 info->band = chanctx_conf->def.chan->band;
4796 }
4797
4798 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP;
4799 info->control.vif = &sdata->vif;
4800
4801 if (key)
4802 info->control.hw_key = &key->conf;
4803
4804 skb_list_walk_safe(skb, seg, next) {
4805 skbs++;
4806 len += seg->len;
4807 if (seg != skb)
4808 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info));
4809 }
4810
4811 if (unlikely(sk_requests_wifi_status(skb->sk))) {
4812 info->status_data = ieee80211_store_ack_skb(local, skb,
4813 &info->flags, 0);
4814 if (info->status_data)
4815 info->status_data_idr = 1;
4816 }
4817
4818 dev_sw_netstats_tx_add(dev, skbs, len);
4819
4820 if (sta) {
4821 sta->deflink.tx_stats.packets[queue] += skbs;
4822 sta->deflink.tx_stats.bytes[queue] += len;
4823 }
4824
4825 ieee80211_tpt_led_trig_tx(local, len);
4826
4827 ieee80211_tx_8023(sdata, skb, sta, false);
4828
4829 return;
4830
4831out_free:
4832 kfree_skb(skb);
4833}
4834
4835static bool ieee80211_check_mcast_offload(struct ieee80211_sub_if_data *sdata,
4836 struct sk_buff *skb)
4837{
4838 struct ethhdr *ehdr = (struct ethhdr *)skb->data;
4839
4840 if ((ieee80211_vif_is_mld(&sdata->vif) &&
4841 (sdata->vif.type == NL80211_IFTYPE_AP &&
4842 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX))) ||
4843 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
4844 !sdata->wdev.use_4addr))
4845 return false;
4846
4847 if (!is_multicast_ether_addr(skb->data) ||
4848 !(sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_MCAST) ||
4849 sdata->control_port_protocol == ehdr->h_proto)
4850 return false;
4851
4852 return true;
4853}
4854
4855static void __ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
4856 struct net_device *dev)
4857{
4858 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4859 struct ethhdr *ehdr = (struct ethhdr *)skb->data;
4860 struct ieee80211_link_data *link;
4861 struct ieee80211_key *key;
4862 struct sta_info *sta;
4863
4864 rcu_read_lock();
4865
4866 if (unlikely(sdata->control_port_protocol == ehdr->h_proto))
4867 goto skip_offload;
4868
4869 if (ieee80211_lookup_ra_sta(sdata, skb, &sta, false)) {
4870 kfree_skb(skb);
4871 goto out;
4872 }
4873
4874 /*
4875 * If STA is invalid, use the multicast offload path when applicable.
4876 * In AP mode, drop the frame if there are no associated stations;
4877 * otherwise use the default link and multicast key for transmission.
4878 */
4879 if (unlikely(IS_ERR_OR_NULL(sta) &&
4880 ieee80211_check_mcast_offload(sdata, skb))) {
4881 sta = NULL;
4882 if (ieee80211_vif_get_num_mcast_if(sdata) <= 0) {
4883 /* No associated STAs - no need to send multicast frames. */
4884 kfree_skb(skb);
4885 goto out;
4886 }
4887 link = &sdata->deflink;
4888 key = rcu_dereference(link->default_multicast_key);
4889 } else if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded ||
4890 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))) {
4891 goto skip_offload;
4892 } else {
4893 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4894 if (!key)
4895 key = rcu_dereference(sdata->default_unicast_key);
4896 }
4897
4898 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) ||
4899 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP))
4900 goto skip_offload;
4901
4902 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
4903 ieee80211_8023_xmit(sdata, dev, sta, key, skb);
4904 goto out;
4905
4906skip_offload:
4907 ieee80211_subif_start_xmit(skb, dev);
4908out:
4909 rcu_read_unlock();
4910}
4911
4912netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
4913 struct net_device *dev)
4914{
4915 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4916 struct ethhdr *ehdr = (struct ethhdr *)skb->data;
4917
4918 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) {
4919 kfree_skb(skb);
4920 return NETDEV_TX_OK;
4921 }
4922
4923 if (unlikely(is_multicast_ether_addr(ehdr->h_dest) &&
4924 ieee80211_multicast_to_unicast(skb, dev))) {
4925 struct sk_buff_head queue;
4926
4927 __skb_queue_head_init(&queue);
4928 ieee80211_convert_to_unicast(skb, dev, &queue);
4929 while ((skb = __skb_dequeue(&queue)))
4930 __ieee80211_subif_start_xmit_8023(skb, dev);
4931 } else {
4932 __ieee80211_subif_start_xmit_8023(skb, dev);
4933 }
4934
4935 return NETDEV_TX_OK;
4936}
4937
4938struct sk_buff *
4939ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
4940 struct sk_buff *skb, u32 info_flags)
4941{
4942 struct ieee80211_hdr *hdr;
4943 struct ieee80211_tx_data tx = {
4944 .local = sdata->local,
4945 .sdata = sdata,
4946 };
4947 struct sta_info *sta;
4948
4949 rcu_read_lock();
4950
4951 if (ieee80211_lookup_ra_sta(sdata, skb, &sta, false)) {
4952 kfree_skb(skb);
4953 skb = ERR_PTR(-EINVAL);
4954 goto out;
4955 }
4956
4957 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta,
4958 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 0);
4959 if (IS_ERR(skb))
4960 goto out;
4961
4962 hdr = (void *)skb->data;
4963 tx.sta = sta_info_get(sdata, hdr->addr1);
4964 tx.skb = skb;
4965
4966 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
4967 rcu_read_unlock();
4968 kfree_skb(skb);
4969 return ERR_PTR(-EINVAL);
4970 }
4971
4972out:
4973 rcu_read_unlock();
4974 return skb;
4975}
4976
4977/*
4978 * ieee80211_clear_tx_pending may not be called in a context where
4979 * it is possible that it packets could come in again.
4980 */
4981void ieee80211_clear_tx_pending(struct ieee80211_local *local)
4982{
4983 struct sk_buff *skb;
4984 int i;
4985
4986 for (i = 0; i < local->hw.queues; i++) {
4987 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
4988 ieee80211_free_txskb(&local->hw, skb);
4989 }
4990}
4991
4992/*
4993 * Returns false if the frame couldn't be transmitted but was queued instead,
4994 * which in this case means re-queued -- take as an indication to stop sending
4995 * more pending frames.
4996 */
4997static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
4998 struct sk_buff *skb)
4999{
5000 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5001 struct ieee80211_sub_if_data *sdata;
5002 struct sta_info *sta;
5003 struct ieee80211_hdr *hdr;
5004 bool result;
5005 struct ieee80211_chanctx_conf *chanctx_conf;
5006
5007 sdata = vif_to_sdata(info->control.vif);
5008
5009 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) {
5010 /* update band only for non-MLD */
5011 if (!ieee80211_vif_is_mld(&sdata->vif)) {
5012 chanctx_conf =
5013 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
5014 if (unlikely(!chanctx_conf)) {
5015 dev_kfree_skb(skb);
5016 return true;
5017 }
5018 info->band = chanctx_conf->def.chan->band;
5019 }
5020 result = ieee80211_tx(sdata, NULL, skb, true);
5021 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
5022 if (ieee80211_lookup_ra_sta(sdata, skb, &sta, true)) {
5023 dev_kfree_skb(skb);
5024 return true;
5025 }
5026
5027 if (IS_ERR(sta) || (sta && !sta->uploaded))
5028 sta = NULL;
5029
5030 result = ieee80211_tx_8023(sdata, skb, sta, true);
5031 } else {
5032 struct sk_buff_head skbs;
5033
5034 __skb_queue_head_init(&skbs);
5035 __skb_queue_tail(&skbs, skb);
5036
5037 hdr = (struct ieee80211_hdr *)skb->data;
5038 sta = sta_info_get(sdata, hdr->addr1);
5039
5040 result = __ieee80211_tx(local, &skbs, sta, true);
5041 }
5042
5043 return result;
5044}
5045
5046/*
5047 * Transmit all pending packets. Called from tasklet.
5048 */
5049void ieee80211_tx_pending(struct tasklet_struct *t)
5050{
5051 struct ieee80211_local *local = from_tasklet(local, t,
5052 tx_pending_tasklet);
5053 unsigned long flags;
5054 int i;
5055 bool txok;
5056
5057 rcu_read_lock();
5058
5059 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
5060 for (i = 0; i < local->hw.queues; i++) {
5061 /*
5062 * If queue is stopped by something other than due to pending
5063 * frames, or we have no pending frames, proceed to next queue.
5064 */
5065 if (local->queue_stop_reasons[i] ||
5066 skb_queue_empty(&local->pending[i]))
5067 continue;
5068
5069 while (!skb_queue_empty(&local->pending[i])) {
5070 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
5071 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5072
5073 if (WARN_ON(!info->control.vif)) {
5074 ieee80211_free_txskb(&local->hw, skb);
5075 continue;
5076 }
5077
5078 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
5079 flags);
5080
5081 txok = ieee80211_tx_pending_skb(local, skb);
5082 spin_lock_irqsave(&local->queue_stop_reason_lock,
5083 flags);
5084 if (!txok)
5085 break;
5086 }
5087 }
5088 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
5089
5090 rcu_read_unlock();
5091}
5092
5093/* functions for drivers to get certain frames */
5094
5095static void ieee80211_beacon_add_tim_pvb(struct ps_data *ps,
5096 struct sk_buff *skb,
5097 bool mcast_traffic)
5098{
5099 int i, n1 = 0, n2;
5100
5101 /*
5102 * Find largest even number N1 so that bits numbered 1 through
5103 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
5104 * (N2 + 1) x 8 through 2007 are 0.
5105 */
5106 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
5107 if (ps->tim[i]) {
5108 n1 = i & 0xfe;
5109 break;
5110 }
5111 }
5112 n2 = n1;
5113 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
5114 if (ps->tim[i]) {
5115 n2 = i;
5116 break;
5117 }
5118 }
5119
5120 /* Bitmap control */
5121 skb_put_u8(skb, n1 | mcast_traffic);
5122 /* Part Virt Bitmap */
5123 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1);
5124}
5125
5126/*
5127 * mac80211 currently supports encoding using block bitmap mode, non
5128 * inversed. The current implementation supports up to 1600 AIDs.
5129 *
5130 * Block bitmap encoding breaks down the AID bitmap into blocks of 64
5131 * AIDs. Each block contains between 0 and 8 subblocks. Each subblock
5132 * describes 8 AIDs and the presence of a subblock is determined by
5133 * the block bitmap.
5134 */
5135static void ieee80211_s1g_beacon_add_tim_pvb(struct ps_data *ps,
5136 struct sk_buff *skb,
5137 bool mcast_traffic,
5138 bool ucast_traffic)
5139{
5140 int blk;
5141
5142 /*
5143 * if no unicast and multicast traffic don't emit a bitmap control
5144 * or pvb
5145 */
5146 if (!mcast_traffic && !ucast_traffic)
5147 return;
5148
5149 /*
5150 * Emit a bitmap control block with a page slice number of 31 and a
5151 * page index of 0 which indicates as per IEEE80211-2024 9.4.2.5.1
5152 * that the entire page (2048 bits) indicated by the page index
5153 * is encoded in the partial virtual bitmap.
5154 */
5155 skb_put_u8(skb, mcast_traffic | (31 << 1));
5156
5157 /* If there's no unicast traffic we don't need to include a PVB. */
5158 if (!ucast_traffic)
5159 return;
5160
5161 /* Emit an encoded block for each non-zero sub-block */
5162 for (blk = 0; blk < IEEE80211_MAX_SUPPORTED_S1G_TIM_BLOCKS; blk++) {
5163 u8 blk_bmap = 0;
5164 int sblk;
5165
5166 for (sblk = 0; sblk < 8; sblk++) {
5167 int sblk_idx = blk * 8 + sblk;
5168
5169 /*
5170 * If the current subblock is non-zero, increase the
5171 * number of subblocks to emit for the current block.
5172 */
5173 if (ps->tim[sblk_idx])
5174 blk_bmap |= BIT(sblk);
5175 }
5176
5177 /* If the current block contains no non-zero sublocks */
5178 if (!blk_bmap)
5179 continue;
5180
5181 /*
5182 * Emit a block control byte for the current encoded block
5183 * with an encoding mode of block bitmap (0x0), not inverse
5184 * (0x0) and the current block offset (5 bits)
5185 */
5186 skb_put_u8(skb, blk << 3);
5187
5188 /*
5189 * Emit the block bitmap for the current encoded block which
5190 * contains the present subblocks.
5191 */
5192 skb_put_u8(skb, blk_bmap);
5193
5194 /* Emit the present subblocks */
5195 for (sblk = 0; sblk < 8; sblk++) {
5196 int sblk_idx = blk * 8 + sblk;
5197
5198 if (!(blk_bmap & BIT(sblk)))
5199 continue;
5200
5201 skb_put_u8(skb, ps->tim[sblk_idx]);
5202 }
5203 }
5204}
5205
5206static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
5207 struct ieee80211_link_data *link,
5208 struct ps_data *ps, struct sk_buff *skb,
5209 bool is_template)
5210{
5211 struct element *tim;
5212 bool mcast_traffic = false, have_bits = false;
5213 struct ieee80211_bss_conf *link_conf = link->conf;
5214 bool s1g = ieee80211_get_link_sband(link)->band == NL80211_BAND_S1GHZ;
5215
5216 /* Generate bitmap for TIM only if there are any STAs in power save
5217 * mode. */
5218 if (atomic_read(&ps->num_sta_ps) > 0)
5219 /* in the hope that this is faster than
5220 * checking byte-for-byte */
5221 have_bits = !bitmap_empty((unsigned long *)ps->tim,
5222 IEEE80211_MAX_AID + 1);
5223
5224 if (!is_template) {
5225 if (ps->dtim_count == 0)
5226 ps->dtim_count = link_conf->dtim_period - 1;
5227 else
5228 ps->dtim_count--;
5229 }
5230
5231 /* Length is set after parsing the AID bitmap */
5232 tim = skb_put(skb, sizeof(struct element));
5233 tim->id = WLAN_EID_TIM;
5234 skb_put_u8(skb, ps->dtim_count);
5235 skb_put_u8(skb, link_conf->dtim_period);
5236
5237 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
5238 mcast_traffic = true;
5239
5240 ps->dtim_bc_mc = mcast_traffic;
5241
5242 if (s1g) {
5243 ieee80211_s1g_beacon_add_tim_pvb(ps, skb, mcast_traffic,
5244 have_bits);
5245 } else if (have_bits) {
5246 ieee80211_beacon_add_tim_pvb(ps, skb, mcast_traffic);
5247 } else {
5248 /* Bitmap control */
5249 skb_put_u8(skb, mcast_traffic);
5250 /* Part Virt Bitmap */
5251 skb_put_u8(skb, 0);
5252 }
5253
5254 tim->datalen = skb_tail_pointer(skb) - tim->data;
5255}
5256
5257static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
5258 struct ieee80211_link_data *link,
5259 struct ps_data *ps, struct sk_buff *skb,
5260 bool is_template)
5261{
5262 struct ieee80211_local *local = sdata->local;
5263
5264 /*
5265 * Not very nice, but we want to allow the driver to call
5266 * ieee80211_beacon_get() as a response to the set_tim()
5267 * callback. That, however, is already invoked under the
5268 * sta_lock to guarantee consistent and race-free update
5269 * of the tim bitmap in mac80211 and the driver.
5270 */
5271 if (local->tim_in_locked_section) {
5272 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template);
5273 } else {
5274 spin_lock_bh(&local->tim_lock);
5275 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template);
5276 spin_unlock_bh(&local->tim_lock);
5277 }
5278
5279 return 0;
5280}
5281
5282static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata,
5283 struct beacon_data *beacon,
5284 struct ieee80211_link_data *link)
5285{
5286 u8 *beacon_data, count, max_count = 1;
5287 struct probe_resp *resp;
5288 size_t beacon_data_len;
5289 u16 *bcn_offsets;
5290 int i;
5291
5292 switch (sdata->vif.type) {
5293 case NL80211_IFTYPE_AP:
5294 beacon_data = beacon->tail;
5295 beacon_data_len = beacon->tail_len;
5296 break;
5297 case NL80211_IFTYPE_ADHOC:
5298 beacon_data = beacon->head;
5299 beacon_data_len = beacon->head_len;
5300 break;
5301 case NL80211_IFTYPE_MESH_POINT:
5302 beacon_data = beacon->head;
5303 beacon_data_len = beacon->head_len;
5304 break;
5305 default:
5306 return;
5307 }
5308
5309 resp = rcu_dereference(link->u.ap.probe_resp);
5310
5311 bcn_offsets = beacon->cntdwn_counter_offsets;
5312 count = beacon->cntdwn_current_counter;
5313 if (link->conf->csa_active)
5314 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM;
5315
5316 for (i = 0; i < max_count; ++i) {
5317 if (bcn_offsets[i]) {
5318 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len))
5319 return;
5320 beacon_data[bcn_offsets[i]] = count;
5321 }
5322
5323 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) {
5324 u16 *resp_offsets = resp->cntdwn_counter_offsets;
5325
5326 if (resp_offsets[i])
5327 resp->data[resp_offsets[i]] = count;
5328 }
5329 }
5330}
5331
5332static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link,
5333 struct beacon_data *beacon)
5334{
5335 if (beacon->cntdwn_current_counter == 1) {
5336 /*
5337 * Channel switch handling is done by a worker thread while
5338 * beacons get pulled from hardware timers. It's therefore
5339 * possible that software threads are slow enough to not be
5340 * able to complete CSA handling in a single beacon interval,
5341 * in which case we get here. There isn't much to do about
5342 * it, other than letting the user know that the AP isn't
5343 * behaving correctly.
5344 */
5345 link_err_once(link,
5346 "beacon TX faster than countdown (channel/color switch) completion\n");
5347 return 0;
5348 }
5349
5350 beacon->cntdwn_current_counter--;
5351
5352 return beacon->cntdwn_current_counter;
5353}
5354
5355u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id)
5356{
5357 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5358 struct ieee80211_link_data *link;
5359 struct beacon_data *beacon = NULL;
5360 u8 count = 0;
5361
5362 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS))
5363 return 0;
5364
5365 rcu_read_lock();
5366
5367 link = rcu_dereference(sdata->link[link_id]);
5368 if (!link)
5369 goto unlock;
5370
5371 if (sdata->vif.type == NL80211_IFTYPE_AP)
5372 beacon = rcu_dereference(link->u.ap.beacon);
5373 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
5374 beacon = rcu_dereference(sdata->u.ibss.presp);
5375 else if (ieee80211_vif_is_mesh(&sdata->vif))
5376 beacon = rcu_dereference(sdata->u.mesh.beacon);
5377
5378 if (!beacon)
5379 goto unlock;
5380
5381 count = __ieee80211_beacon_update_cntdwn(link, beacon);
5382
5383unlock:
5384 rcu_read_unlock();
5385 return count;
5386}
5387EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn);
5388
5389void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter)
5390{
5391 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5392 struct beacon_data *beacon = NULL;
5393
5394 rcu_read_lock();
5395
5396 if (sdata->vif.type == NL80211_IFTYPE_AP)
5397 beacon = rcu_dereference(sdata->deflink.u.ap.beacon);
5398 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
5399 beacon = rcu_dereference(sdata->u.ibss.presp);
5400 else if (ieee80211_vif_is_mesh(&sdata->vif))
5401 beacon = rcu_dereference(sdata->u.mesh.beacon);
5402
5403 if (!beacon)
5404 goto unlock;
5405
5406 if (counter < beacon->cntdwn_current_counter)
5407 beacon->cntdwn_current_counter = counter;
5408
5409unlock:
5410 rcu_read_unlock();
5411}
5412EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn);
5413
5414bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif,
5415 unsigned int link_id)
5416{
5417 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5418 struct ieee80211_link_data *link;
5419 struct beacon_data *beacon = NULL;
5420 u8 *beacon_data;
5421 size_t beacon_data_len;
5422 int ret = false;
5423
5424 if (!ieee80211_sdata_running(sdata))
5425 return false;
5426
5427 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS))
5428 return 0;
5429
5430 rcu_read_lock();
5431
5432 link = rcu_dereference(sdata->link[link_id]);
5433 if (!link)
5434 goto out;
5435
5436 if (vif->type == NL80211_IFTYPE_AP) {
5437 beacon = rcu_dereference(link->u.ap.beacon);
5438 if (WARN_ON(!beacon || !beacon->tail))
5439 goto out;
5440 beacon_data = beacon->tail;
5441 beacon_data_len = beacon->tail_len;
5442 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
5443 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
5444
5445 beacon = rcu_dereference(ifibss->presp);
5446 if (!beacon)
5447 goto out;
5448
5449 beacon_data = beacon->head;
5450 beacon_data_len = beacon->head_len;
5451 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
5452 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
5453
5454 beacon = rcu_dereference(ifmsh->beacon);
5455 if (!beacon)
5456 goto out;
5457
5458 beacon_data = beacon->head;
5459 beacon_data_len = beacon->head_len;
5460 } else {
5461 WARN_ON(1);
5462 goto out;
5463 }
5464
5465 if (!beacon->cntdwn_counter_offsets[0])
5466 goto out;
5467
5468 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len))
5469 goto out;
5470
5471 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1)
5472 ret = true;
5473
5474 out:
5475 rcu_read_unlock();
5476
5477 return ret;
5478}
5479EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete);
5480
5481static int ieee80211_beacon_protect(struct sk_buff *skb,
5482 struct ieee80211_local *local,
5483 struct ieee80211_sub_if_data *sdata,
5484 struct ieee80211_link_data *link)
5485{
5486 ieee80211_tx_result res;
5487 struct ieee80211_tx_data tx;
5488 struct sk_buff *check_skb;
5489
5490 memset(&tx, 0, sizeof(tx));
5491 tx.key = rcu_dereference(link->default_beacon_key);
5492 if (!tx.key)
5493 return 0;
5494
5495 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) {
5496 tx.key = NULL;
5497 return -EINVAL;
5498 }
5499
5500 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
5501 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
5502 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf;
5503
5504 tx.local = local;
5505 tx.sdata = sdata;
5506 __skb_queue_head_init(&tx.skbs);
5507 __skb_queue_tail(&tx.skbs, skb);
5508 res = ieee80211_tx_h_encrypt(&tx);
5509 check_skb = __skb_dequeue(&tx.skbs);
5510 /* we may crash after this, but it'd be a bug in crypto */
5511 WARN_ON(check_skb != skb);
5512 if (WARN_ON_ONCE(res != TX_CONTINUE))
5513 return -EINVAL;
5514
5515 return 0;
5516}
5517
5518int ieee80211_encrypt_tx_skb(struct sk_buff *skb)
5519{
5520 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
5521 struct ieee80211_sub_if_data *sdata = NULL;
5522 struct sk_buff *check_skb;
5523 struct ieee80211_tx_data tx;
5524 ieee80211_tx_result res;
5525
5526 if (!info->control.hw_key)
5527 return 0;
5528
5529 memset(&tx, 0, sizeof(tx));
5530 tx.key = container_of(info->control.hw_key, struct ieee80211_key, conf);
5531 /* NULL it out now so we do full SW crypto */
5532 info->control.hw_key = NULL;
5533 __skb_queue_head_init(&tx.skbs);
5534 __skb_queue_tail(&tx.skbs, skb);
5535
5536 if (skb->dev)
5537 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
5538 else if (info->control.vif)
5539 sdata = vif_to_sdata(info->control.vif);
5540
5541 if (WARN_ON(!sdata))
5542 return -EINVAL;
5543
5544 tx.sdata = sdata;
5545 tx.local = sdata->local;
5546 res = ieee80211_tx_h_encrypt(&tx);
5547 check_skb = __skb_dequeue(&tx.skbs);
5548 /* we may crash after this, but it'd be a bug in crypto */
5549 WARN_ON(check_skb != skb);
5550 if (WARN_ON_ONCE(res != TX_CONTINUE))
5551 return -EINVAL;
5552
5553 return 0;
5554}
5555EXPORT_SYMBOL_GPL(ieee80211_encrypt_tx_skb);
5556
5557static void
5558ieee80211_beacon_get_finish(struct ieee80211_hw *hw,
5559 struct ieee80211_vif *vif,
5560 struct ieee80211_link_data *link,
5561 struct ieee80211_mutable_offsets *offs,
5562 struct beacon_data *beacon,
5563 struct sk_buff *skb,
5564 struct ieee80211_chanctx_conf *chanctx_conf,
5565 u16 csa_off_base)
5566{
5567 struct ieee80211_local *local = hw_to_local(hw);
5568 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5569 struct ieee80211_tx_info *info;
5570 enum nl80211_band band;
5571 struct ieee80211_tx_rate_control txrc;
5572
5573 /* CSA offsets */
5574 if (offs && beacon) {
5575 u16 i;
5576
5577 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) {
5578 u16 csa_off = beacon->cntdwn_counter_offsets[i];
5579
5580 if (!csa_off)
5581 continue;
5582
5583 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off;
5584 }
5585 }
5586
5587 band = chanctx_conf->def.chan->band;
5588 info = IEEE80211_SKB_CB(skb);
5589 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
5590 info->flags |= IEEE80211_TX_CTL_NO_ACK;
5591 info->band = band;
5592
5593 memset(&txrc, 0, sizeof(txrc));
5594 txrc.hw = hw;
5595 txrc.sband = local->hw.wiphy->bands[band];
5596 txrc.bss_conf = link->conf;
5597 txrc.skb = skb;
5598 txrc.reported_rate.idx = -1;
5599 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band])
5600 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band];
5601 else
5602 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
5603 txrc.bss = true;
5604 rate_control_get_rate(sdata, NULL, &txrc);
5605
5606 info->control.vif = vif;
5607 info->control.flags |= u32_encode_bits(link->link_id,
5608 IEEE80211_TX_CTRL_MLO_LINK);
5609 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
5610 IEEE80211_TX_CTL_ASSIGN_SEQ |
5611 IEEE80211_TX_CTL_FIRST_FRAGMENT;
5612}
5613
5614static void
5615ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon,
5616 u8 i)
5617{
5618 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt ||
5619 i > beacon->mbssid_ies->cnt)
5620 return;
5621
5622 if (i < beacon->mbssid_ies->cnt) {
5623 skb_put_data(skb, beacon->mbssid_ies->elem[i].data,
5624 beacon->mbssid_ies->elem[i].len);
5625
5626 if (beacon->rnr_ies && beacon->rnr_ies->cnt) {
5627 skb_put_data(skb, beacon->rnr_ies->elem[i].data,
5628 beacon->rnr_ies->elem[i].len);
5629
5630 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++)
5631 skb_put_data(skb, beacon->rnr_ies->elem[i].data,
5632 beacon->rnr_ies->elem[i].len);
5633 }
5634 return;
5635 }
5636
5637 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */
5638 for (i = 0; i < beacon->mbssid_ies->cnt; i++)
5639 skb_put_data(skb, beacon->mbssid_ies->elem[i].data,
5640 beacon->mbssid_ies->elem[i].len);
5641}
5642
5643static struct sk_buff *
5644__ieee80211_beacon_get_ap(struct ieee80211_hw *hw,
5645 struct ieee80211_vif *vif,
5646 struct ieee80211_link_data *link,
5647 struct ieee80211_mutable_offsets *offs,
5648 bool is_template,
5649 struct beacon_data *beacon,
5650 struct ieee80211_chanctx_conf *chanctx_conf,
5651 u8 ema_index)
5652{
5653 struct ieee80211_local *local = hw_to_local(hw);
5654 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5655 struct ieee80211_if_ap *ap = &sdata->u.ap;
5656 struct sk_buff *skb = NULL;
5657 u16 csa_off_base = 0;
5658 int mbssid_len;
5659
5660 if (beacon->cntdwn_counter_offsets[0]) {
5661 if (!is_template)
5662 ieee80211_beacon_update_cntdwn(vif, link->link_id);
5663
5664 ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5665 }
5666
5667 /* headroom, head length,
5668 * tail length, maximum TIM length and multiple BSSID length
5669 */
5670 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies,
5671 beacon->rnr_ies,
5672 ema_index);
5673
5674 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
5675 beacon->tail_len + 256 +
5676 local->hw.extra_beacon_tailroom + mbssid_len);
5677 if (!skb)
5678 return NULL;
5679
5680 skb_reserve(skb, local->tx_headroom);
5681 skb_put_data(skb, beacon->head, beacon->head_len);
5682
5683 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template);
5684
5685 if (offs) {
5686 offs->tim_offset = beacon->head_len;
5687 offs->tim_length = skb->len - beacon->head_len;
5688 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0];
5689
5690 if (mbssid_len) {
5691 ieee80211_beacon_add_mbssid(skb, beacon, ema_index);
5692 offs->mbssid_off = skb->len - mbssid_len;
5693 }
5694
5695 /* for AP the csa offsets are from tail */
5696 csa_off_base = skb->len;
5697 }
5698
5699 if (beacon->tail)
5700 skb_put_data(skb, beacon->tail, beacon->tail_len);
5701
5702 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) {
5703 dev_kfree_skb(skb);
5704 return NULL;
5705 }
5706
5707 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5708 chanctx_conf, csa_off_base);
5709 return skb;
5710}
5711
5712static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata,
5713 struct ieee80211_link_data *link)
5714{
5715 struct ps_data *ps = &sdata->u.ap.ps;
5716
5717 if (ps->sb_count == 0)
5718 ps->sb_count = link->conf->s1g_long_beacon_period - 1;
5719 else
5720 ps->sb_count--;
5721
5722 return ps->sb_count == 0;
5723}
5724
5725static struct sk_buff *
5726ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw,
5727 struct ieee80211_vif *vif,
5728 struct ieee80211_link_data *link,
5729 struct ieee80211_chanctx_conf *chanctx_conf,
5730 struct s1g_short_beacon_data *sb,
5731 bool is_template)
5732{
5733 struct ieee80211_local *local = hw_to_local(hw);
5734 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5735 struct ieee80211_if_ap *ap = &sdata->u.ap;
5736 struct sk_buff *skb;
5737
5738 skb = dev_alloc_skb(local->tx_headroom + sb->short_head_len +
5739 sb->short_tail_len + 256 +
5740 local->hw.extra_beacon_tailroom);
5741 if (!skb)
5742 return NULL;
5743
5744 skb_reserve(skb, local->tx_headroom);
5745 skb_put_data(skb, sb->short_head, sb->short_head_len);
5746
5747 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template);
5748
5749 if (sb->short_tail)
5750 skb_put_data(skb, sb->short_tail, sb->short_tail_len);
5751
5752 ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb,
5753 chanctx_conf, 0);
5754 return skb;
5755}
5756
5757static struct sk_buff *
5758ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5759 struct ieee80211_link_data *link,
5760 struct ieee80211_mutable_offsets *offs,
5761 bool is_template, struct beacon_data *beacon,
5762 struct ieee80211_chanctx_conf *chanctx_conf,
5763 u8 ema_index, struct s1g_short_beacon_data *s1g_sb)
5764{
5765 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5766
5767 if (!sdata->vif.cfg.s1g || !s1g_sb ||
5768 ieee80211_s1g_need_long_beacon(sdata, link))
5769 return __ieee80211_beacon_get_ap(hw, vif, link, offs,
5770 is_template, beacon,
5771 chanctx_conf, ema_index);
5772
5773 return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf,
5774 s1g_sb, is_template);
5775}
5776
5777static struct ieee80211_ema_beacons *
5778ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw,
5779 struct ieee80211_vif *vif,
5780 struct ieee80211_link_data *link,
5781 struct ieee80211_mutable_offsets *offs,
5782 bool is_template, struct beacon_data *beacon,
5783 struct ieee80211_chanctx_conf *chanctx_conf)
5784{
5785 struct ieee80211_ema_beacons *ema = NULL;
5786
5787 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt)
5788 return NULL;
5789
5790 ema = kzalloc_flex(*ema, bcn, beacon->mbssid_ies->cnt, GFP_ATOMIC);
5791 if (!ema)
5792 return NULL;
5793
5794 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) {
5795 ema->bcn[ema->cnt].skb =
5796 ieee80211_beacon_get_ap(hw, vif, link,
5797 &ema->bcn[ema->cnt].offs,
5798 is_template, beacon,
5799 chanctx_conf, ema->cnt, NULL);
5800 if (!ema->bcn[ema->cnt].skb)
5801 break;
5802 }
5803
5804 if (ema->cnt == beacon->mbssid_ies->cnt)
5805 return ema;
5806
5807 ieee80211_beacon_free_ema_list(ema);
5808 return NULL;
5809}
5810
5811#define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1
5812
5813static struct sk_buff *
5814__ieee80211_beacon_get(struct ieee80211_hw *hw,
5815 struct ieee80211_vif *vif,
5816 struct ieee80211_mutable_offsets *offs,
5817 bool is_template,
5818 unsigned int link_id,
5819 int ema_index,
5820 struct ieee80211_ema_beacons **ema_beacons)
5821{
5822 struct ieee80211_local *local = hw_to_local(hw);
5823 struct beacon_data *beacon = NULL;
5824 struct sk_buff *skb = NULL;
5825 struct ieee80211_sub_if_data *sdata = NULL;
5826 struct ieee80211_chanctx_conf *chanctx_conf;
5827 struct ieee80211_link_data *link;
5828 struct s1g_short_beacon_data *s1g_short_bcn = NULL;
5829
5830 rcu_read_lock();
5831
5832 sdata = vif_to_sdata(vif);
5833 link = rcu_dereference(sdata->link[link_id]);
5834 if (!link)
5835 goto out;
5836 chanctx_conf =
5837 rcu_dereference(link->conf->chanctx_conf);
5838
5839 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
5840 goto out;
5841
5842 if (offs)
5843 memset(offs, 0, sizeof(*offs));
5844
5845 if (sdata->vif.type == NL80211_IFTYPE_AP) {
5846 beacon = rcu_dereference(link->u.ap.beacon);
5847 if (!beacon)
5848 goto out;
5849
5850 if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) {
5851 s1g_short_bcn =
5852 rcu_dereference(link->u.ap.s1g_short_beacon);
5853 if (!s1g_short_bcn)
5854 goto out;
5855 }
5856
5857 if (ema_beacons) {
5858 *ema_beacons =
5859 ieee80211_beacon_get_ap_ema_list(hw, vif, link,
5860 offs,
5861 is_template,
5862 beacon,
5863 chanctx_conf);
5864 } else {
5865 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) {
5866 if (ema_index >= beacon->mbssid_ies->cnt)
5867 goto out; /* End of MBSSID elements */
5868
5869 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS)
5870 ema_index = beacon->mbssid_ies->cnt;
5871 } else {
5872 ema_index = 0;
5873 }
5874
5875 skb = ieee80211_beacon_get_ap(hw, vif, link, offs,
5876 is_template, beacon,
5877 chanctx_conf, ema_index,
5878 s1g_short_bcn);
5879 }
5880 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
5881 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
5882 struct ieee80211_hdr *hdr;
5883
5884 beacon = rcu_dereference(ifibss->presp);
5885 if (!beacon)
5886 goto out;
5887
5888 if (beacon->cntdwn_counter_offsets[0]) {
5889 if (!is_template)
5890 __ieee80211_beacon_update_cntdwn(link, beacon);
5891
5892 ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5893 }
5894
5895 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
5896 local->hw.extra_beacon_tailroom);
5897 if (!skb)
5898 goto out;
5899 skb_reserve(skb, local->tx_headroom);
5900 skb_put_data(skb, beacon->head, beacon->head_len);
5901
5902 hdr = (struct ieee80211_hdr *) skb->data;
5903 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
5904 IEEE80211_STYPE_BEACON);
5905
5906 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5907 chanctx_conf, 0);
5908 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
5909 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
5910
5911 beacon = rcu_dereference(ifmsh->beacon);
5912 if (!beacon)
5913 goto out;
5914
5915 if (beacon->cntdwn_counter_offsets[0]) {
5916 if (!is_template)
5917 /* TODO: For mesh csa_counter is in TU, so
5918 * decrementing it by one isn't correct, but
5919 * for now we leave it consistent with overall
5920 * mac80211's behavior.
5921 */
5922 __ieee80211_beacon_update_cntdwn(link, beacon);
5923
5924 ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5925 }
5926
5927 if (ifmsh->sync_ops)
5928 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
5929
5930 skb = dev_alloc_skb(local->tx_headroom +
5931 beacon->head_len +
5932 256 + /* TIM IE */
5933 beacon->tail_len +
5934 local->hw.extra_beacon_tailroom);
5935 if (!skb)
5936 goto out;
5937 skb_reserve(skb, local->tx_headroom);
5938 skb_put_data(skb, beacon->head, beacon->head_len);
5939 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb,
5940 is_template);
5941
5942 if (offs) {
5943 offs->tim_offset = beacon->head_len;
5944 offs->tim_length = skb->len - beacon->head_len;
5945 }
5946
5947 skb_put_data(skb, beacon->tail, beacon->tail_len);
5948 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5949 chanctx_conf, 0);
5950 } else {
5951 WARN_ON(1);
5952 goto out;
5953 }
5954
5955 out:
5956 rcu_read_unlock();
5957 return skb;
5958
5959}
5960
5961struct sk_buff *
5962ieee80211_beacon_get_template(struct ieee80211_hw *hw,
5963 struct ieee80211_vif *vif,
5964 struct ieee80211_mutable_offsets *offs,
5965 unsigned int link_id)
5966{
5967 return __ieee80211_beacon_get(hw, vif, offs, true, link_id,
5968 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL);
5969}
5970EXPORT_SYMBOL(ieee80211_beacon_get_template);
5971
5972struct sk_buff *
5973ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw,
5974 struct ieee80211_vif *vif,
5975 struct ieee80211_mutable_offsets *offs,
5976 unsigned int link_id, u8 ema_index)
5977{
5978 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index,
5979 NULL);
5980}
5981EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index);
5982
5983void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons)
5984{
5985 u8 i;
5986
5987 if (!ema_beacons)
5988 return;
5989
5990 for (i = 0; i < ema_beacons->cnt; i++)
5991 kfree_skb(ema_beacons->bcn[i].skb);
5992
5993 kfree(ema_beacons);
5994}
5995EXPORT_SYMBOL(ieee80211_beacon_free_ema_list);
5996
5997struct ieee80211_ema_beacons *
5998ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw,
5999 struct ieee80211_vif *vif,
6000 unsigned int link_id)
6001{
6002 struct ieee80211_ema_beacons *ema_beacons = NULL;
6003
6004 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0,
6005 &ema_beacons));
6006
6007 return ema_beacons;
6008}
6009EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list);
6010
6011struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
6012 struct ieee80211_vif *vif,
6013 u16 *tim_offset, u16 *tim_length,
6014 unsigned int link_id)
6015{
6016 struct ieee80211_mutable_offsets offs = {};
6017 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false,
6018 link_id,
6019 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS,
6020 NULL);
6021 struct sk_buff *copy;
6022
6023 if (!bcn)
6024 return bcn;
6025
6026 if (tim_offset)
6027 *tim_offset = offs.tim_offset;
6028
6029 if (tim_length)
6030 *tim_length = offs.tim_length;
6031
6032 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
6033 !hw_to_local(hw)->monitors)
6034 return bcn;
6035
6036 /* send a copy to monitor interfaces */
6037 copy = skb_copy(bcn, GFP_ATOMIC);
6038 if (!copy)
6039 return bcn;
6040
6041 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, NULL);
6042
6043 return bcn;
6044}
6045EXPORT_SYMBOL(ieee80211_beacon_get_tim);
6046
6047struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
6048 struct ieee80211_vif *vif)
6049{
6050 struct sk_buff *skb = NULL;
6051 struct probe_resp *presp = NULL;
6052 struct ieee80211_hdr *hdr;
6053 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
6054
6055 if (sdata->vif.type != NL80211_IFTYPE_AP)
6056 return NULL;
6057
6058 rcu_read_lock();
6059 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp);
6060 if (!presp)
6061 goto out;
6062
6063 skb = dev_alloc_skb(presp->len);
6064 if (!skb)
6065 goto out;
6066
6067 skb_put_data(skb, presp->data, presp->len);
6068
6069 hdr = (struct ieee80211_hdr *) skb->data;
6070 memset(hdr->addr1, 0, sizeof(hdr->addr1));
6071
6072out:
6073 rcu_read_unlock();
6074 return skb;
6075}
6076EXPORT_SYMBOL(ieee80211_proberesp_get);
6077
6078struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw,
6079 struct ieee80211_vif *vif,
6080 unsigned int link_id)
6081{
6082 struct sk_buff *skb = NULL;
6083 struct fils_discovery_data *tmpl = NULL;
6084 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
6085 struct ieee80211_link_data *link;
6086
6087 if (sdata->vif.type != NL80211_IFTYPE_AP)
6088 return NULL;
6089
6090 if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS)
6091 return NULL;
6092
6093 guard(rcu)();
6094 link = rcu_dereference(sdata->link[link_id]);
6095 if (!link)
6096 return NULL;
6097
6098 tmpl = rcu_dereference(link->u.ap.fils_discovery);
6099 if (!tmpl)
6100 return NULL;
6101
6102 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
6103 if (skb) {
6104 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
6105 skb_put_data(skb, tmpl->data, tmpl->len);
6106 }
6107
6108 return skb;
6109}
6110EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl);
6111
6112struct sk_buff *
6113ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw,
6114 struct ieee80211_vif *vif,
6115 unsigned int link_id)
6116{
6117 struct sk_buff *skb = NULL;
6118 struct unsol_bcast_probe_resp_data *tmpl = NULL;
6119 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
6120 struct ieee80211_link_data *link;
6121
6122 if (sdata->vif.type != NL80211_IFTYPE_AP)
6123 return NULL;
6124
6125 if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS)
6126 return NULL;
6127
6128 guard(rcu)();
6129 link = rcu_dereference(sdata->link[link_id]);
6130 if (!link)
6131 return NULL;
6132
6133 tmpl = rcu_dereference(link->u.ap.unsol_bcast_probe_resp);
6134 if (!tmpl)
6135 return NULL;
6136
6137 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
6138 if (skb) {
6139 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
6140 skb_put_data(skb, tmpl->data, tmpl->len);
6141 }
6142
6143 return skb;
6144}
6145EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl);
6146
6147struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
6148 struct ieee80211_vif *vif)
6149{
6150 struct ieee80211_sub_if_data *sdata;
6151 struct ieee80211_pspoll *pspoll;
6152 struct ieee80211_local *local;
6153 struct sk_buff *skb;
6154
6155 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
6156 return NULL;
6157
6158 sdata = vif_to_sdata(vif);
6159 local = sdata->local;
6160
6161 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
6162 if (!skb)
6163 return NULL;
6164
6165 skb_reserve(skb, local->hw.extra_tx_headroom);
6166
6167 pspoll = skb_put_zero(skb, sizeof(*pspoll));
6168 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
6169 IEEE80211_STYPE_PSPOLL);
6170 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid);
6171
6172 /* aid in PS-Poll has its two MSBs each set to 1 */
6173 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
6174
6175 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
6176 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
6177
6178 return skb;
6179}
6180EXPORT_SYMBOL(ieee80211_pspoll_get);
6181
6182struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
6183 struct ieee80211_vif *vif,
6184 int link_id, bool qos_ok)
6185{
6186 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
6187 struct ieee80211_local *local = sdata->local;
6188 struct ieee80211_link_data *link = NULL;
6189 struct ieee80211_hdr_3addr *nullfunc;
6190 struct sk_buff *skb;
6191 bool qos = false;
6192
6193 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
6194 return NULL;
6195
6196 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
6197 sizeof(*nullfunc) + 2);
6198 if (!skb)
6199 return NULL;
6200
6201 rcu_read_lock();
6202 if (qos_ok) {
6203 struct sta_info *sta;
6204
6205 sta = sta_info_get(sdata, vif->cfg.ap_addr);
6206 qos = sta && sta->sta.wme;
6207 }
6208
6209 if (link_id >= 0) {
6210 link = rcu_dereference(sdata->link[link_id]);
6211 if (WARN_ON_ONCE(!link)) {
6212 rcu_read_unlock();
6213 kfree_skb(skb);
6214 return NULL;
6215 }
6216 }
6217
6218 skb_reserve(skb, local->hw.extra_tx_headroom);
6219
6220 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
6221 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
6222 IEEE80211_STYPE_NULLFUNC |
6223 IEEE80211_FCTL_TODS);
6224 if (qos) {
6225 __le16 qoshdr = cpu_to_le16(7);
6226
6227 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
6228 IEEE80211_STYPE_NULLFUNC) !=
6229 IEEE80211_STYPE_QOS_NULLFUNC);
6230 nullfunc->frame_control |=
6231 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
6232 skb->priority = 7;
6233 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
6234 skb_put_data(skb, &qoshdr, sizeof(qoshdr));
6235 }
6236
6237 if (link) {
6238 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN);
6239 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN);
6240 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN);
6241 } else {
6242 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN);
6243 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
6244 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN);
6245 }
6246 rcu_read_unlock();
6247
6248 return skb;
6249}
6250EXPORT_SYMBOL(ieee80211_nullfunc_get);
6251
6252struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
6253 const u8 *src_addr,
6254 const u8 *ssid, size_t ssid_len,
6255 size_t tailroom)
6256{
6257 struct ieee80211_local *local = hw_to_local(hw);
6258 struct ieee80211_hdr_3addr *hdr;
6259 struct sk_buff *skb;
6260 size_t ie_ssid_len;
6261 u8 *pos;
6262
6263 ie_ssid_len = 2 + ssid_len;
6264
6265 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
6266 ie_ssid_len + tailroom);
6267 if (!skb)
6268 return NULL;
6269
6270 skb_reserve(skb, local->hw.extra_tx_headroom);
6271
6272 hdr = skb_put_zero(skb, sizeof(*hdr));
6273 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
6274 IEEE80211_STYPE_PROBE_REQ);
6275 eth_broadcast_addr(hdr->addr1);
6276 memcpy(hdr->addr2, src_addr, ETH_ALEN);
6277 eth_broadcast_addr(hdr->addr3);
6278
6279 pos = skb_put(skb, ie_ssid_len);
6280 *pos++ = WLAN_EID_SSID;
6281 *pos++ = ssid_len;
6282 if (ssid_len)
6283 memcpy(pos, ssid, ssid_len);
6284 pos += ssid_len;
6285
6286 return skb;
6287}
6288EXPORT_SYMBOL(ieee80211_probereq_get);
6289
6290void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
6291 const void *frame, size_t frame_len,
6292 const struct ieee80211_tx_info *frame_txctl,
6293 struct ieee80211_rts *rts)
6294{
6295 const struct ieee80211_hdr *hdr = frame;
6296
6297 rts->frame_control =
6298 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
6299 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
6300 frame_txctl);
6301 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
6302 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
6303}
6304EXPORT_SYMBOL(ieee80211_rts_get);
6305
6306void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
6307 const void *frame, size_t frame_len,
6308 const struct ieee80211_tx_info *frame_txctl,
6309 struct ieee80211_cts *cts)
6310{
6311 const struct ieee80211_hdr *hdr = frame;
6312
6313 cts->frame_control =
6314 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
6315 cts->duration = ieee80211_ctstoself_duration(hw, vif,
6316 frame_len, frame_txctl);
6317 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
6318}
6319EXPORT_SYMBOL(ieee80211_ctstoself_get);
6320
6321struct sk_buff *
6322ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
6323 struct ieee80211_vif *vif)
6324{
6325 struct ieee80211_local *local = hw_to_local(hw);
6326 struct sk_buff *skb = NULL;
6327 struct ieee80211_tx_data tx;
6328 struct ieee80211_sub_if_data *sdata;
6329 struct ps_data *ps;
6330 struct ieee80211_tx_info *info;
6331 struct ieee80211_chanctx_conf *chanctx_conf;
6332
6333 sdata = vif_to_sdata(vif);
6334
6335 rcu_read_lock();
6336 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
6337
6338 if (!chanctx_conf)
6339 goto out;
6340
6341 if (sdata->vif.type == NL80211_IFTYPE_AP) {
6342 struct beacon_data *beacon =
6343 rcu_dereference(sdata->deflink.u.ap.beacon);
6344
6345 if (!beacon || !beacon->head)
6346 goto out;
6347
6348 ps = &sdata->u.ap.ps;
6349 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
6350 ps = &sdata->u.mesh.ps;
6351 } else {
6352 goto out;
6353 }
6354
6355 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
6356 goto out; /* send buffered bc/mc only after DTIM beacon */
6357
6358 while (1) {
6359 skb = skb_dequeue(&ps->bc_buf);
6360 if (!skb)
6361 goto out;
6362 local->total_ps_buffered--;
6363
6364 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
6365 struct ieee80211_hdr *hdr =
6366 (struct ieee80211_hdr *) skb->data;
6367 /* more buffered multicast/broadcast frames ==> set
6368 * MoreData flag in IEEE 802.11 header to inform PS
6369 * STAs */
6370 hdr->frame_control |=
6371 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
6372 }
6373
6374 if (sdata->vif.type == NL80211_IFTYPE_AP)
6375 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
6376 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
6377 break;
6378 ieee80211_free_txskb(hw, skb);
6379 }
6380
6381 info = IEEE80211_SKB_CB(skb);
6382
6383 tx.flags |= IEEE80211_TX_PS_BUFFERED;
6384 info->band = chanctx_conf->def.chan->band;
6385
6386 if (invoke_tx_handlers(&tx))
6387 skb = NULL;
6388 out:
6389 rcu_read_unlock();
6390
6391 return skb;
6392}
6393EXPORT_SYMBOL(ieee80211_get_buffered_bc);
6394
6395int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
6396{
6397 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
6398 struct ieee80211_sub_if_data *sdata = sta->sdata;
6399 struct ieee80211_local *local = sdata->local;
6400 int ret;
6401 u32 queues;
6402
6403 lockdep_assert_wiphy(local->hw.wiphy);
6404
6405 /* only some cases are supported right now */
6406 switch (sdata->vif.type) {
6407 case NL80211_IFTYPE_STATION:
6408 case NL80211_IFTYPE_AP:
6409 case NL80211_IFTYPE_AP_VLAN:
6410 break;
6411 default:
6412 WARN_ON(1);
6413 return -EINVAL;
6414 }
6415
6416 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
6417 return -EINVAL;
6418
6419 if (sta->reserved_tid == tid) {
6420 ret = 0;
6421 goto out;
6422 }
6423
6424 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
6425 sdata_err(sdata, "TID reservation already active\n");
6426 ret = -EALREADY;
6427 goto out;
6428 }
6429
6430 ieee80211_stop_vif_queues(sdata->local, sdata,
6431 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
6432
6433 synchronize_net();
6434
6435 /* Tear down BA sessions so we stop aggregating on this TID */
6436 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
6437 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
6438 __ieee80211_stop_tx_ba_session(sta, tid,
6439 AGG_STOP_LOCAL_REQUEST);
6440 }
6441
6442 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
6443 __ieee80211_flush_queues(local, sdata, queues, false);
6444
6445 sta->reserved_tid = tid;
6446
6447 ieee80211_wake_vif_queues(local, sdata,
6448 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
6449
6450 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
6451 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
6452
6453 ret = 0;
6454 out:
6455 return ret;
6456}
6457EXPORT_SYMBOL(ieee80211_reserve_tid);
6458
6459void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
6460{
6461 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
6462 struct ieee80211_sub_if_data *sdata = sta->sdata;
6463
6464 lockdep_assert_wiphy(sdata->local->hw.wiphy);
6465
6466 /* only some cases are supported right now */
6467 switch (sdata->vif.type) {
6468 case NL80211_IFTYPE_STATION:
6469 case NL80211_IFTYPE_AP:
6470 case NL80211_IFTYPE_AP_VLAN:
6471 break;
6472 default:
6473 WARN_ON(1);
6474 return;
6475 }
6476
6477 if (tid != sta->reserved_tid) {
6478 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
6479 return;
6480 }
6481
6482 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
6483}
6484EXPORT_SYMBOL(ieee80211_unreserve_tid);
6485
6486void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
6487 struct sk_buff *skb, int tid, int link_id,
6488 enum nl80211_band band)
6489{
6490 const struct ieee80211_hdr *hdr = (void *)skb->data;
6491 int ac = ieee80211_ac_from_tid(tid);
6492 unsigned int link;
6493
6494 skb_reset_mac_header(skb);
6495 skb_set_queue_mapping(skb, ac);
6496 skb->priority = tid;
6497
6498 skb->dev = sdata->dev;
6499
6500 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS);
6501 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK,
6502 IEEE80211_LINK_UNSPECIFIED));
6503
6504 if (!ieee80211_vif_is_mld(&sdata->vif)) {
6505 link = 0;
6506 } else if (link_id >= 0) {
6507 link = link_id;
6508 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) {
6509 /* address from the MLD */
6510 link = IEEE80211_LINK_UNSPECIFIED;
6511 } else {
6512 /* otherwise must be addressed from a link */
6513 rcu_read_lock();
6514 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) {
6515 struct ieee80211_bss_conf *link_conf;
6516
6517 link_conf = rcu_dereference(sdata->vif.link_conf[link]);
6518 if (!link_conf)
6519 continue;
6520 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0)
6521 break;
6522 }
6523 rcu_read_unlock();
6524
6525 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf)))
6526 link = ffs(sdata->vif.active_links) - 1;
6527 }
6528
6529 IEEE80211_SKB_CB(skb)->control.flags |=
6530 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK);
6531
6532 /*
6533 * The other path calling ieee80211_xmit is from the tasklet,
6534 * and while we can handle concurrent transmissions locking
6535 * requirements are that we do not come into tx with bhs on.
6536 */
6537 local_bh_disable();
6538 IEEE80211_SKB_CB(skb)->band = band;
6539 ieee80211_xmit(sdata, NULL, skb);
6540 local_bh_enable();
6541}
6542
6543void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
6544 struct sk_buff *skb, int tid, int link_id)
6545{
6546 struct ieee80211_chanctx_conf *chanctx_conf;
6547 enum nl80211_band band;
6548
6549 rcu_read_lock();
6550 if (sdata->vif.type == NL80211_IFTYPE_NAN ||
6551 sdata->vif.type == NL80211_IFTYPE_NAN_DATA) {
6552 band = NUM_NL80211_BANDS;
6553 } else if (!ieee80211_vif_is_mld(&sdata->vif)) {
6554 WARN_ON(link_id >= 0);
6555 chanctx_conf =
6556 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
6557 if (WARN_ON(!chanctx_conf)) {
6558 rcu_read_unlock();
6559 kfree_skb(skb);
6560 return;
6561 }
6562 band = chanctx_conf->def.chan->band;
6563 } else {
6564 WARN_ON(link_id >= 0 &&
6565 !(sdata->vif.active_links & BIT(link_id)));
6566 /* MLD transmissions must not rely on the band */
6567 band = 0;
6568 }
6569
6570 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band);
6571 rcu_read_unlock();
6572}
6573
6574int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
6575 const u8 *buf, size_t len,
6576 const u8 *dest, __be16 proto, bool unencrypted,
6577 int link_id, u64 cookie)
6578{
6579 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
6580 struct ieee80211_local *local = sdata->local;
6581 struct sta_info *sta;
6582 struct sk_buff *skb;
6583 struct ethhdr *ehdr;
6584 u32 ctrl_flags = 0;
6585 u32 flags = 0;
6586 int err;
6587
6588 /* mutex lock is only needed for incrementing the cookie counter */
6589 lockdep_assert_wiphy(local->hw.wiphy);
6590
6591 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
6592 * or Pre-Authentication
6593 */
6594 if (proto != sdata->control_port_protocol &&
6595 proto != cpu_to_be16(ETH_P_PREAUTH))
6596 return -EINVAL;
6597
6598 if (proto == sdata->control_port_protocol)
6599 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO |
6600 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
6601
6602 if (unencrypted)
6603 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
6604
6605 if (cookie)
6606 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
6607
6608 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX;
6609
6610 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
6611 sizeof(struct ethhdr) + len);
6612 if (!skb)
6613 return -ENOMEM;
6614
6615 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
6616
6617 skb_put_data(skb, buf, len);
6618
6619 ehdr = skb_push(skb, sizeof(struct ethhdr));
6620 memcpy(ehdr->h_dest, dest, ETH_ALEN);
6621
6622 /* we may override the SA for MLO STA later */
6623 if (link_id < 0) {
6624 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED,
6625 IEEE80211_TX_CTRL_MLO_LINK);
6626 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
6627 } else {
6628 struct ieee80211_bss_conf *link_conf;
6629
6630 ctrl_flags |= u32_encode_bits(link_id,
6631 IEEE80211_TX_CTRL_MLO_LINK);
6632
6633 rcu_read_lock();
6634 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]);
6635 if (!link_conf) {
6636 dev_kfree_skb(skb);
6637 rcu_read_unlock();
6638 return -ENOLINK;
6639 }
6640 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN);
6641 rcu_read_unlock();
6642 }
6643
6644 ehdr->h_proto = proto;
6645
6646 skb->dev = dev;
6647 skb->protocol = proto;
6648 skb_reset_network_header(skb);
6649 skb_reset_mac_header(skb);
6650
6651 if (local->hw.queues < IEEE80211_NUM_ACS)
6652 goto start_xmit;
6653
6654 /* update QoS header to prioritize control port frames if possible,
6655 * prioritization also happens for control port frames send over
6656 * AF_PACKET
6657 */
6658 rcu_read_lock();
6659 err = ieee80211_lookup_ra_sta(sdata, skb, &sta, true);
6660 if (err) {
6661 dev_kfree_skb(skb);
6662 rcu_read_unlock();
6663 return err;
6664 }
6665
6666 if (!IS_ERR(sta)) {
6667 u16 queue = ieee80211_select_queue(sdata, sta, skb);
6668
6669 skb_set_queue_mapping(skb, queue);
6670
6671 /*
6672 * for MLO STA, the SA should be the AP MLD address, but
6673 * the link ID has been selected already
6674 */
6675 if (sta && sta->sta.mlo)
6676 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
6677 }
6678 rcu_read_unlock();
6679
6680start_xmit:
6681 local_bh_disable();
6682 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie);
6683 local_bh_enable();
6684
6685 return 0;
6686}
6687
6688int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev,
6689 const u8 *buf, size_t len)
6690{
6691 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
6692 struct ieee80211_local *local = sdata->local;
6693 struct sk_buff *skb;
6694
6695 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len +
6696 30 + /* header size */
6697 18); /* 11s header size */
6698 if (!skb)
6699 return -ENOMEM;
6700
6701 skb_reserve(skb, local->hw.extra_tx_headroom);
6702 skb_put_data(skb, buf, len);
6703
6704 skb->dev = dev;
6705 skb->protocol = htons(ETH_P_802_3);
6706 skb_reset_network_header(skb);
6707 skb_reset_mac_header(skb);
6708
6709 local_bh_disable();
6710 __ieee80211_subif_start_xmit(skb, skb->dev, 0,
6711 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP,
6712 0);
6713 local_bh_enable();
6714
6715 return 0;
6716}