1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Copyright (C) 2018-2024 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/gso.h>
30
31 #include "ieee80211_i.h"
32 #include "driver-ops.h"
33 #include "led.h"
34 #include "mesh.h"
35 #include "wep.h"
36 #include "wpa.h"
37 #include "wme.h"
38 #include "rate.h"
39
40 /* misc utils */
41
ieee80211_duration(struct ieee80211_tx_data * tx,struct sk_buff * skb,int group_addr,int next_frag_len)42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
43 struct sk_buff *skb, int group_addr,
44 int next_frag_len)
45 {
46 int rate, mrate, erp, dur, i;
47 struct ieee80211_rate *txrate;
48 struct ieee80211_local *local = tx->local;
49 struct ieee80211_supported_band *sband;
50 struct ieee80211_hdr *hdr;
51 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
52 struct ieee80211_chanctx_conf *chanctx_conf;
53 u32 rate_flags = 0;
54
55 /* assume HW handles this */
56 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
57 return 0;
58
59 rcu_read_lock();
60 chanctx_conf = rcu_dereference(tx->sdata->vif.bss_conf.chanctx_conf);
61 if (chanctx_conf)
62 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
63 rcu_read_unlock();
64
65 /* uh huh? */
66 if (WARN_ON_ONCE(tx->rate.idx < 0))
67 return 0;
68
69 sband = local->hw.wiphy->bands[info->band];
70 txrate = &sband->bitrates[tx->rate.idx];
71
72 erp = txrate->flags & IEEE80211_RATE_ERP_G;
73
74 /* device is expected to do this */
75 if (sband->band == NL80211_BAND_S1GHZ)
76 return 0;
77
78 /*
79 * data and mgmt (except PS Poll):
80 * - during CFP: 32768
81 * - during contention period:
82 * if addr1 is group address: 0
83 * if more fragments = 0 and addr1 is individual address: time to
84 * transmit one ACK plus SIFS
85 * if more fragments = 1 and addr1 is individual address: time to
86 * transmit next fragment plus 2 x ACK plus 3 x SIFS
87 *
88 * IEEE 802.11, 9.6:
89 * - control response frame (CTS or ACK) shall be transmitted using the
90 * same rate as the immediately previous frame in the frame exchange
91 * sequence, if this rate belongs to the PHY mandatory rates, or else
92 * at the highest possible rate belonging to the PHY rates in the
93 * BSSBasicRateSet
94 */
95 hdr = (struct ieee80211_hdr *)skb->data;
96 if (ieee80211_is_ctl(hdr->frame_control)) {
97 /* TODO: These control frames are not currently sent by
98 * mac80211, but should they be implemented, this function
99 * needs to be updated to support duration field calculation.
100 *
101 * RTS: time needed to transmit pending data/mgmt frame plus
102 * one CTS frame plus one ACK frame plus 3 x SIFS
103 * CTS: duration of immediately previous RTS minus time
104 * required to transmit CTS and its SIFS
105 * ACK: 0 if immediately previous directed data/mgmt had
106 * more=0, with more=1 duration in ACK frame is duration
107 * from previous frame minus time needed to transmit ACK
108 * and its SIFS
109 * PS Poll: BIT(15) | BIT(14) | aid
110 */
111 return 0;
112 }
113
114 /* data/mgmt */
115 if (0 /* FIX: data/mgmt during CFP */)
116 return cpu_to_le16(32768);
117
118 if (group_addr) /* Group address as the destination - no ACK */
119 return 0;
120
121 /* Individual destination address:
122 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
123 * CTS and ACK frames shall be transmitted using the highest rate in
124 * basic rate set that is less than or equal to the rate of the
125 * immediately previous frame and that is using the same modulation
126 * (CCK or OFDM). If no basic rate set matches with these requirements,
127 * the highest mandatory rate of the PHY that is less than or equal to
128 * the rate of the previous frame is used.
129 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
130 */
131 rate = -1;
132 /* use lowest available if everything fails */
133 mrate = sband->bitrates[0].bitrate;
134 for (i = 0; i < sband->n_bitrates; i++) {
135 struct ieee80211_rate *r = &sband->bitrates[i];
136 u32 flag;
137
138 if (r->bitrate > txrate->bitrate)
139 break;
140
141 if ((rate_flags & r->flags) != rate_flags)
142 continue;
143
144 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
145 rate = r->bitrate;
146
147 switch (sband->band) {
148 case NL80211_BAND_2GHZ:
149 case NL80211_BAND_LC:
150 if (tx->sdata->deflink.operating_11g_mode)
151 flag = IEEE80211_RATE_MANDATORY_G;
152 else
153 flag = IEEE80211_RATE_MANDATORY_B;
154 break;
155 case NL80211_BAND_5GHZ:
156 case NL80211_BAND_6GHZ:
157 flag = IEEE80211_RATE_MANDATORY_A;
158 break;
159 default:
160 flag = 0;
161 WARN_ON(1);
162 break;
163 }
164
165 if (r->flags & flag)
166 mrate = r->bitrate;
167 }
168 if (rate == -1) {
169 /* No matching basic rate found; use highest suitable mandatory
170 * PHY rate */
171 rate = mrate;
172 }
173
174 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
175 if (ieee80211_is_data_qos(hdr->frame_control) &&
176 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
177 dur = 0;
178 else
179 /* Time needed to transmit ACK
180 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
181 * to closest integer */
182 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
183 tx->sdata->vif.bss_conf.use_short_preamble);
184
185 if (next_frag_len) {
186 /* Frame is fragmented: duration increases with time needed to
187 * transmit next fragment plus ACK and 2 x SIFS. */
188 dur *= 2; /* ACK + SIFS */
189 /* next fragment */
190 dur += ieee80211_frame_duration(sband->band, next_frag_len,
191 txrate->bitrate, erp,
192 tx->sdata->vif.bss_conf.use_short_preamble);
193 }
194
195 return cpu_to_le16(dur);
196 }
197
198 /* tx handlers */
199 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data * tx)200 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
201 {
202 struct ieee80211_local *local = tx->local;
203 struct ieee80211_if_managed *ifmgd;
204 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
205
206 /* driver doesn't support power save */
207 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
208 return TX_CONTINUE;
209
210 /* hardware does dynamic power save */
211 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
212 return TX_CONTINUE;
213
214 /* dynamic power save disabled */
215 if (local->hw.conf.dynamic_ps_timeout <= 0)
216 return TX_CONTINUE;
217
218 /* we are scanning, don't enable power save */
219 if (local->scanning)
220 return TX_CONTINUE;
221
222 if (!local->ps_sdata)
223 return TX_CONTINUE;
224
225 /* No point if we're going to suspend */
226 if (local->quiescing)
227 return TX_CONTINUE;
228
229 /* dynamic ps is supported only in managed mode */
230 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
231 return TX_CONTINUE;
232
233 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK))
234 return TX_CONTINUE;
235
236 ifmgd = &tx->sdata->u.mgd;
237
238 /*
239 * Don't wakeup from power save if u-apsd is enabled, voip ac has
240 * u-apsd enabled and the frame is in voip class. This effectively
241 * means that even if all access categories have u-apsd enabled, in
242 * practise u-apsd is only used with the voip ac. This is a
243 * workaround for the case when received voip class packets do not
244 * have correct qos tag for some reason, due the network or the
245 * peer application.
246 *
247 * Note: ifmgd->uapsd_queues access is racy here. If the value is
248 * changed via debugfs, user needs to reassociate manually to have
249 * everything in sync.
250 */
251 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
252 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
253 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
254 return TX_CONTINUE;
255
256 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
257 ieee80211_stop_queues_by_reason(&local->hw,
258 IEEE80211_MAX_QUEUE_MAP,
259 IEEE80211_QUEUE_STOP_REASON_PS,
260 false);
261 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
262 wiphy_work_queue(local->hw.wiphy,
263 &local->dynamic_ps_disable_work);
264 }
265
266 /* Don't restart the timer if we're not disassociated */
267 if (!ifmgd->associated)
268 return TX_CONTINUE;
269
270 mod_timer(&local->dynamic_ps_timer, jiffies +
271 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
272
273 return TX_CONTINUE;
274 }
275
276 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_check_assoc(struct ieee80211_tx_data * tx)277 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
278 {
279
280 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
281 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
282 bool assoc = false;
283
284 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
285 return TX_CONTINUE;
286
287 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
288 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
289 !ieee80211_is_probe_req(hdr->frame_control) &&
290 !ieee80211_is_any_nullfunc(hdr->frame_control))
291 /*
292 * When software scanning only nullfunc frames (to notify
293 * the sleep state to the AP) and probe requests (for the
294 * active scan) are allowed, all other frames should not be
295 * sent and we should not get here, but if we do
296 * nonetheless, drop them to avoid sending them
297 * off-channel. See the link below and
298 * ieee80211_start_scan() for more.
299 *
300 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
301 */
302 return TX_DROP;
303
304 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
305 return TX_CONTINUE;
306
307 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
308 return TX_CONTINUE;
309
310 if (tx->sta)
311 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
312
313 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
314 if (unlikely(!assoc &&
315 ieee80211_is_data(hdr->frame_control))) {
316 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
317 sdata_info(tx->sdata,
318 "dropped data frame to not associated station %pM\n",
319 hdr->addr1);
320 #endif
321 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
322 return TX_DROP;
323 }
324 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
325 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
326 /*
327 * No associated STAs - no need to send multicast
328 * frames.
329 */
330 return TX_DROP;
331 }
332
333 return TX_CONTINUE;
334 }
335
336 /* This function is called whenever the AP is about to exceed the maximum limit
337 * of buffered frames for power saving STAs. This situation should not really
338 * happen often during normal operation, so dropping the oldest buffered packet
339 * from each queue should be OK to make some room for new frames. */
purge_old_ps_buffers(struct ieee80211_local * local)340 static void purge_old_ps_buffers(struct ieee80211_local *local)
341 {
342 int total = 0, purged = 0;
343 struct sk_buff *skb;
344 struct ieee80211_sub_if_data *sdata;
345 struct sta_info *sta;
346
347 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
348 struct ps_data *ps;
349
350 if (sdata->vif.type == NL80211_IFTYPE_AP)
351 ps = &sdata->u.ap.ps;
352 else if (ieee80211_vif_is_mesh(&sdata->vif))
353 ps = &sdata->u.mesh.ps;
354 else
355 continue;
356
357 skb = skb_dequeue(&ps->bc_buf);
358 if (skb) {
359 purged++;
360 ieee80211_free_txskb(&local->hw, skb);
361 }
362 total += skb_queue_len(&ps->bc_buf);
363 }
364
365 /*
366 * Drop one frame from each station from the lowest-priority
367 * AC that has frames at all.
368 */
369 list_for_each_entry_rcu(sta, &local->sta_list, list) {
370 int ac;
371
372 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
373 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
374 total += skb_queue_len(&sta->ps_tx_buf[ac]);
375 if (skb) {
376 purged++;
377 ieee80211_free_txskb(&local->hw, skb);
378 break;
379 }
380 }
381 }
382
383 local->total_ps_buffered = total;
384 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
385 }
386
387 static ieee80211_tx_result
ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data * tx)388 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
389 {
390 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
391 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
392 struct ps_data *ps;
393
394 /*
395 * broadcast/multicast frame
396 *
397 * If any of the associated/peer stations is in power save mode,
398 * the frame is buffered to be sent after DTIM beacon frame.
399 * This is done either by the hardware or us.
400 */
401
402 /* powersaving STAs currently only in AP/VLAN/mesh mode */
403 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
404 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
405 if (!tx->sdata->bss)
406 return TX_CONTINUE;
407
408 ps = &tx->sdata->bss->ps;
409 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
410 ps = &tx->sdata->u.mesh.ps;
411 } else {
412 return TX_CONTINUE;
413 }
414
415
416 /* no buffering for ordered frames */
417 if (ieee80211_has_order(hdr->frame_control))
418 return TX_CONTINUE;
419
420 if (ieee80211_is_probe_req(hdr->frame_control))
421 return TX_CONTINUE;
422
423 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
424 info->hw_queue = tx->sdata->vif.cab_queue;
425
426 /* no stations in PS mode and no buffered packets */
427 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
428 return TX_CONTINUE;
429
430 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
431
432 /* device releases frame after DTIM beacon */
433 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
434 return TX_CONTINUE;
435
436 /* buffered in mac80211 */
437 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
438 purge_old_ps_buffers(tx->local);
439
440 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
441 ps_dbg(tx->sdata,
442 "BC TX buffer full - dropping the oldest frame\n");
443 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
444 } else
445 tx->local->total_ps_buffered++;
446
447 skb_queue_tail(&ps->bc_buf, tx->skb);
448
449 return TX_QUEUED;
450 }
451
ieee80211_use_mfp(__le16 fc,struct sta_info * sta,struct sk_buff * skb)452 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
453 struct sk_buff *skb)
454 {
455 if (!ieee80211_is_mgmt(fc))
456 return 0;
457
458 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
459 return 0;
460
461 if (!ieee80211_is_robust_mgmt_frame(skb))
462 return 0;
463
464 return 1;
465 }
466
467 static ieee80211_tx_result
ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data * tx)468 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
469 {
470 struct sta_info *sta = tx->sta;
471 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
472 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
473 struct ieee80211_local *local = tx->local;
474
475 if (unlikely(!sta))
476 return TX_CONTINUE;
477
478 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
479 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
480 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
481 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
482 int ac = skb_get_queue_mapping(tx->skb);
483
484 if (ieee80211_is_mgmt(hdr->frame_control) &&
485 !ieee80211_is_bufferable_mmpdu(tx->skb)) {
486 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
487 return TX_CONTINUE;
488 }
489
490 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
491 sta->sta.addr, sta->sta.aid, ac);
492 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
493 purge_old_ps_buffers(tx->local);
494
495 /* sync with ieee80211_sta_ps_deliver_wakeup */
496 spin_lock(&sta->ps_lock);
497 /*
498 * STA woke up the meantime and all the frames on ps_tx_buf have
499 * been queued to pending queue. No reordering can happen, go
500 * ahead and Tx the packet.
501 */
502 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
503 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
504 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
505 spin_unlock(&sta->ps_lock);
506 return TX_CONTINUE;
507 }
508
509 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
510 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
511 ps_dbg(tx->sdata,
512 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
513 sta->sta.addr, ac);
514 ieee80211_free_txskb(&local->hw, old);
515 } else
516 tx->local->total_ps_buffered++;
517
518 info->control.jiffies = jiffies;
519 info->control.vif = &tx->sdata->vif;
520 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
521 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
522 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
523 spin_unlock(&sta->ps_lock);
524
525 if (!timer_pending(&local->sta_cleanup))
526 mod_timer(&local->sta_cleanup,
527 round_jiffies(jiffies +
528 STA_INFO_CLEANUP_INTERVAL));
529
530 /*
531 * We queued up some frames, so the TIM bit might
532 * need to be set, recalculate it.
533 */
534 sta_info_recalc_tim(sta);
535
536 return TX_QUEUED;
537 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
538 ps_dbg(tx->sdata,
539 "STA %pM in PS mode, but polling/in SP -> send frame\n",
540 sta->sta.addr);
541 }
542
543 return TX_CONTINUE;
544 }
545
546 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_ps_buf(struct ieee80211_tx_data * tx)547 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
548 {
549 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
550 return TX_CONTINUE;
551
552 if (tx->flags & IEEE80211_TX_UNICAST)
553 return ieee80211_tx_h_unicast_ps_buf(tx);
554 else
555 return ieee80211_tx_h_multicast_ps_buf(tx);
556 }
557
558 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data * tx)559 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
560 {
561 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
562
563 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
564 if (tx->sdata->control_port_no_encrypt)
565 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
566 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
567 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
568 }
569
570 return TX_CONTINUE;
571 }
572
573 static struct ieee80211_key *
ieee80211_select_link_key(struct ieee80211_tx_data * tx)574 ieee80211_select_link_key(struct ieee80211_tx_data *tx)
575 {
576 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
577 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
578 struct ieee80211_link_data *link;
579 unsigned int link_id;
580
581 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK);
582 if (link_id == IEEE80211_LINK_UNSPECIFIED) {
583 link = &tx->sdata->deflink;
584 } else {
585 link = rcu_dereference(tx->sdata->link[link_id]);
586 if (!link)
587 return NULL;
588 }
589
590 if (ieee80211_is_group_privacy_action(tx->skb))
591 return rcu_dereference(link->default_multicast_key);
592 else if (ieee80211_is_mgmt(hdr->frame_control) &&
593 is_multicast_ether_addr(hdr->addr1) &&
594 ieee80211_is_robust_mgmt_frame(tx->skb))
595 return rcu_dereference(link->default_mgmt_key);
596 else if (is_multicast_ether_addr(hdr->addr1))
597 return rcu_dereference(link->default_multicast_key);
598
599 return NULL;
600 }
601
602 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_select_key(struct ieee80211_tx_data * tx)603 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
604 {
605 struct ieee80211_key *key;
606 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
607 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
608
609 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) {
610 tx->key = NULL;
611 return TX_CONTINUE;
612 }
613
614 if (tx->sta &&
615 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
616 tx->key = key;
617 else if ((key = ieee80211_select_link_key(tx)))
618 tx->key = key;
619 else if (!is_multicast_ether_addr(hdr->addr1) &&
620 (key = rcu_dereference(tx->sdata->default_unicast_key)))
621 tx->key = key;
622 else
623 tx->key = NULL;
624
625 if (tx->key) {
626 bool skip_hw = false;
627
628 /* TODO: add threshold stuff again */
629
630 switch (tx->key->conf.cipher) {
631 case WLAN_CIPHER_SUITE_WEP40:
632 case WLAN_CIPHER_SUITE_WEP104:
633 case WLAN_CIPHER_SUITE_TKIP:
634 if (!ieee80211_is_data_present(hdr->frame_control))
635 tx->key = NULL;
636 break;
637 case WLAN_CIPHER_SUITE_CCMP:
638 case WLAN_CIPHER_SUITE_CCMP_256:
639 case WLAN_CIPHER_SUITE_GCMP:
640 case WLAN_CIPHER_SUITE_GCMP_256:
641 if (!ieee80211_is_data_present(hdr->frame_control) &&
642 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
643 tx->skb) &&
644 !ieee80211_is_group_privacy_action(tx->skb))
645 tx->key = NULL;
646 else
647 skip_hw = (tx->key->conf.flags &
648 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
649 ieee80211_is_mgmt(hdr->frame_control);
650 break;
651 case WLAN_CIPHER_SUITE_AES_CMAC:
652 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
653 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
654 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
655 if (!ieee80211_is_mgmt(hdr->frame_control))
656 tx->key = NULL;
657 break;
658 }
659
660 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
661 !ieee80211_is_deauth(hdr->frame_control)) &&
662 tx->skb->protocol != tx->sdata->control_port_protocol)
663 return TX_DROP;
664
665 if (!skip_hw && tx->key &&
666 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
667 info->control.hw_key = &tx->key->conf;
668 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta &&
669 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) {
670 return TX_DROP;
671 }
672
673 return TX_CONTINUE;
674 }
675
676 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data * tx)677 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
678 {
679 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
680 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
681 struct ieee80211_supported_band *sband;
682 u32 len;
683 struct ieee80211_tx_rate_control txrc;
684 struct ieee80211_sta_rates *ratetbl = NULL;
685 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP;
686 bool assoc = false;
687
688 memset(&txrc, 0, sizeof(txrc));
689
690 sband = tx->local->hw.wiphy->bands[info->band];
691
692 len = min_t(u32, tx->skb->len + FCS_LEN,
693 tx->local->hw.wiphy->frag_threshold);
694
695 /* set up the tx rate control struct we give the RC algo */
696 txrc.hw = &tx->local->hw;
697 txrc.sband = sband;
698 txrc.bss_conf = &tx->sdata->vif.bss_conf;
699 txrc.skb = tx->skb;
700 txrc.reported_rate.idx = -1;
701
702 if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) {
703 txrc.rate_idx_mask = ~0;
704 } else {
705 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
706
707 if (tx->sdata->rc_has_mcs_mask[info->band])
708 txrc.rate_idx_mcs_mask =
709 tx->sdata->rc_rateidx_mcs_mask[info->band];
710 }
711
712 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
713 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
714 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
715 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
716
717 /* set up RTS protection if desired */
718 if (len > tx->local->hw.wiphy->rts_threshold) {
719 txrc.rts = true;
720 }
721
722 info->control.use_rts = txrc.rts;
723 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
724
725 /*
726 * Use short preamble if the BSS can handle it, but not for
727 * management frames unless we know the receiver can handle
728 * that -- the management frame might be to a station that
729 * just wants a probe response.
730 */
731 if (tx->sdata->vif.bss_conf.use_short_preamble &&
732 (ieee80211_is_tx_data(tx->skb) ||
733 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
734 txrc.short_preamble = true;
735
736 info->control.short_preamble = txrc.short_preamble;
737
738 /* don't ask rate control when rate already injected via radiotap */
739 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
740 return TX_CONTINUE;
741
742 if (tx->sta)
743 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
744
745 /*
746 * Lets not bother rate control if we're associated and cannot
747 * talk to the sta. This should not happen.
748 */
749 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
750 !rate_usable_index_exists(sband, &tx->sta->sta),
751 "%s: Dropped data frame as no usable bitrate found while "
752 "scanning and associated. Target station: "
753 "%pM on %d GHz band\n",
754 tx->sdata->name,
755 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1,
756 info->band ? 5 : 2))
757 return TX_DROP;
758
759 /*
760 * If we're associated with the sta at this point we know we can at
761 * least send the frame at the lowest bit rate.
762 */
763 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
764
765 if (tx->sta && !info->control.skip_table)
766 ratetbl = rcu_dereference(tx->sta->sta.rates);
767
768 if (unlikely(info->control.rates[0].idx < 0)) {
769 if (ratetbl) {
770 struct ieee80211_tx_rate rate = {
771 .idx = ratetbl->rate[0].idx,
772 .flags = ratetbl->rate[0].flags,
773 .count = ratetbl->rate[0].count
774 };
775
776 if (ratetbl->rate[0].idx < 0)
777 return TX_DROP;
778
779 tx->rate = rate;
780 } else {
781 return TX_DROP;
782 }
783 } else {
784 tx->rate = info->control.rates[0];
785 }
786
787 if (txrc.reported_rate.idx < 0) {
788 txrc.reported_rate = tx->rate;
789 if (tx->sta && ieee80211_is_tx_data(tx->skb))
790 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
791 } else if (tx->sta)
792 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
793
794 if (ratetbl)
795 return TX_CONTINUE;
796
797 if (unlikely(!info->control.rates[0].count))
798 info->control.rates[0].count = 1;
799
800 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
801 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
802 info->control.rates[0].count = 1;
803
804 return TX_CONTINUE;
805 }
806
ieee80211_tx_next_seq(struct sta_info * sta,int tid)807 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
808 {
809 u16 *seq = &sta->tid_seq[tid];
810 __le16 ret = cpu_to_le16(*seq);
811
812 /* Increase the sequence number. */
813 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
814
815 return ret;
816 }
817
818 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_sequence(struct ieee80211_tx_data * tx)819 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
820 {
821 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
822 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
823 int tid;
824
825 /*
826 * Packet injection may want to control the sequence
827 * number, if we have no matching interface then we
828 * neither assign one ourselves nor ask the driver to.
829 */
830 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
831 return TX_CONTINUE;
832
833 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
834 return TX_CONTINUE;
835
836 if (ieee80211_hdrlen(hdr->frame_control) < 24)
837 return TX_CONTINUE;
838
839 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
840 return TX_CONTINUE;
841
842 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO)
843 return TX_CONTINUE;
844
845 /* SNS11 from 802.11be 10.3.2.14 */
846 if (unlikely(is_multicast_ether_addr(hdr->addr1) &&
847 ieee80211_vif_is_mld(info->control.vif) &&
848 info->control.vif->type == NL80211_IFTYPE_AP)) {
849 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX)
850 tx->sdata->mld_mcast_seq += 0x10;
851 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq);
852 return TX_CONTINUE;
853 }
854
855 /*
856 * Anything but QoS data that has a sequence number field
857 * (is long enough) gets a sequence number from the global
858 * counter. QoS data frames with a multicast destination
859 * also use the global counter (802.11-2012 9.3.2.10).
860 */
861 if (!ieee80211_is_data_qos(hdr->frame_control) ||
862 is_multicast_ether_addr(hdr->addr1)) {
863 /* driver should assign sequence number */
864 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
865 /* for pure STA mode without beacons, we can do it */
866 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
867 tx->sdata->sequence_number += 0x10;
868 if (tx->sta)
869 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++;
870 return TX_CONTINUE;
871 }
872
873 /*
874 * This should be true for injected/management frames only, for
875 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
876 * above since they are not QoS-data frames.
877 */
878 if (!tx->sta)
879 return TX_CONTINUE;
880
881 /* include per-STA, per-TID sequence counter */
882 tid = ieee80211_get_tid(hdr);
883 tx->sta->deflink.tx_stats.msdu[tid]++;
884
885 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
886
887 return TX_CONTINUE;
888 }
889
ieee80211_fragment(struct ieee80211_tx_data * tx,struct sk_buff * skb,int hdrlen,int frag_threshold)890 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
891 struct sk_buff *skb, int hdrlen,
892 int frag_threshold)
893 {
894 struct ieee80211_local *local = tx->local;
895 struct ieee80211_tx_info *info;
896 struct sk_buff *tmp;
897 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
898 int pos = hdrlen + per_fragm;
899 int rem = skb->len - hdrlen - per_fragm;
900
901 if (WARN_ON(rem < 0))
902 return -EINVAL;
903
904 /* first fragment was already added to queue by caller */
905
906 while (rem) {
907 int fraglen = per_fragm;
908
909 if (fraglen > rem)
910 fraglen = rem;
911 rem -= fraglen;
912 tmp = dev_alloc_skb(local->tx_headroom +
913 frag_threshold +
914 IEEE80211_ENCRYPT_HEADROOM +
915 IEEE80211_ENCRYPT_TAILROOM);
916 if (!tmp)
917 return -ENOMEM;
918
919 __skb_queue_tail(&tx->skbs, tmp);
920
921 skb_reserve(tmp,
922 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM);
923
924 /* copy control information */
925 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
926
927 info = IEEE80211_SKB_CB(tmp);
928 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
929 IEEE80211_TX_CTL_FIRST_FRAGMENT);
930
931 if (rem)
932 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
933
934 skb_copy_queue_mapping(tmp, skb);
935 tmp->priority = skb->priority;
936 tmp->dev = skb->dev;
937
938 /* copy header and data */
939 skb_put_data(tmp, skb->data, hdrlen);
940 skb_put_data(tmp, skb->data + pos, fraglen);
941
942 pos += fraglen;
943 }
944
945 /* adjust first fragment's length */
946 skb_trim(skb, hdrlen + per_fragm);
947 return 0;
948 }
949
950 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_fragment(struct ieee80211_tx_data * tx)951 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
952 {
953 struct sk_buff *skb = tx->skb;
954 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
955 struct ieee80211_hdr *hdr = (void *)skb->data;
956 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
957 int hdrlen;
958 int fragnum;
959
960 /* no matter what happens, tx->skb moves to tx->skbs */
961 __skb_queue_tail(&tx->skbs, skb);
962 tx->skb = NULL;
963
964 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
965 return TX_CONTINUE;
966
967 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
968 return TX_CONTINUE;
969
970 /*
971 * Warn when submitting a fragmented A-MPDU frame and drop it.
972 * This scenario is handled in ieee80211_tx_prepare but extra
973 * caution taken here as fragmented ampdu may cause Tx stop.
974 */
975 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
976 return TX_DROP;
977
978 hdrlen = ieee80211_hdrlen(hdr->frame_control);
979
980 /* internal error, why isn't DONTFRAG set? */
981 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
982 return TX_DROP;
983
984 /*
985 * Now fragment the frame. This will allocate all the fragments and
986 * chain them (using skb as the first fragment) to skb->next.
987 * During transmission, we will remove the successfully transmitted
988 * fragments from this list. When the low-level driver rejects one
989 * of the fragments then we will simply pretend to accept the skb
990 * but store it away as pending.
991 */
992 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
993 return TX_DROP;
994
995 /* update duration/seq/flags of fragments */
996 fragnum = 0;
997
998 skb_queue_walk(&tx->skbs, skb) {
999 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
1000
1001 hdr = (void *)skb->data;
1002 info = IEEE80211_SKB_CB(skb);
1003
1004 if (!skb_queue_is_last(&tx->skbs, skb)) {
1005 hdr->frame_control |= morefrags;
1006 /*
1007 * No multi-rate retries for fragmented frames, that
1008 * would completely throw off the NAV at other STAs.
1009 */
1010 info->control.rates[1].idx = -1;
1011 info->control.rates[2].idx = -1;
1012 info->control.rates[3].idx = -1;
1013 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
1014 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1015 } else {
1016 hdr->frame_control &= ~morefrags;
1017 }
1018 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
1019 fragnum++;
1020 }
1021
1022 return TX_CONTINUE;
1023 }
1024
1025 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_stats(struct ieee80211_tx_data * tx)1026 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1027 {
1028 struct sk_buff *skb;
1029 int ac = -1;
1030
1031 if (!tx->sta)
1032 return TX_CONTINUE;
1033
1034 skb_queue_walk(&tx->skbs, skb) {
1035 ac = skb_get_queue_mapping(skb);
1036 tx->sta->deflink.tx_stats.bytes[ac] += skb->len;
1037 }
1038 if (ac >= 0)
1039 tx->sta->deflink.tx_stats.packets[ac]++;
1040
1041 return TX_CONTINUE;
1042 }
1043
1044 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_encrypt(struct ieee80211_tx_data * tx)1045 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1046 {
1047 if (!tx->key)
1048 return TX_CONTINUE;
1049
1050 switch (tx->key->conf.cipher) {
1051 case WLAN_CIPHER_SUITE_WEP40:
1052 case WLAN_CIPHER_SUITE_WEP104:
1053 return ieee80211_crypto_wep_encrypt(tx);
1054 case WLAN_CIPHER_SUITE_TKIP:
1055 return ieee80211_crypto_tkip_encrypt(tx);
1056 case WLAN_CIPHER_SUITE_CCMP:
1057 return ieee80211_crypto_ccmp_encrypt(
1058 tx, IEEE80211_CCMP_MIC_LEN);
1059 case WLAN_CIPHER_SUITE_CCMP_256:
1060 return ieee80211_crypto_ccmp_encrypt(
1061 tx, IEEE80211_CCMP_256_MIC_LEN);
1062 case WLAN_CIPHER_SUITE_AES_CMAC:
1063 return ieee80211_crypto_aes_cmac_encrypt(tx);
1064 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1065 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1066 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1067 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1068 return ieee80211_crypto_aes_gmac_encrypt(tx);
1069 case WLAN_CIPHER_SUITE_GCMP:
1070 case WLAN_CIPHER_SUITE_GCMP_256:
1071 return ieee80211_crypto_gcmp_encrypt(tx);
1072 }
1073
1074 return TX_DROP;
1075 }
1076
1077 static ieee80211_tx_result debug_noinline
ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data * tx)1078 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1079 {
1080 struct sk_buff *skb;
1081 struct ieee80211_hdr *hdr;
1082 int next_len;
1083 bool group_addr;
1084
1085 skb_queue_walk(&tx->skbs, skb) {
1086 hdr = (void *) skb->data;
1087 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1088 break; /* must not overwrite AID */
1089 if (!skb_queue_is_last(&tx->skbs, skb)) {
1090 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1091 next_len = next->len;
1092 } else
1093 next_len = 0;
1094 group_addr = is_multicast_ether_addr(hdr->addr1);
1095
1096 hdr->duration_id =
1097 ieee80211_duration(tx, skb, group_addr, next_len);
1098 }
1099
1100 return TX_CONTINUE;
1101 }
1102
1103 /* actual transmit path */
1104
ieee80211_tx_prep_agg(struct ieee80211_tx_data * tx,struct sk_buff * skb,struct ieee80211_tx_info * info,struct tid_ampdu_tx * tid_tx,int tid)1105 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1106 struct sk_buff *skb,
1107 struct ieee80211_tx_info *info,
1108 struct tid_ampdu_tx *tid_tx,
1109 int tid)
1110 {
1111 bool queued = false;
1112 bool reset_agg_timer = false;
1113 struct sk_buff *purge_skb = NULL;
1114
1115 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1116 reset_agg_timer = true;
1117 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1118 /*
1119 * nothing -- this aggregation session is being started
1120 * but that might still fail with the driver
1121 */
1122 } else if (!tx->sta->sta.txq[tid]) {
1123 spin_lock(&tx->sta->lock);
1124 /*
1125 * Need to re-check now, because we may get here
1126 *
1127 * 1) in the window during which the setup is actually
1128 * already done, but not marked yet because not all
1129 * packets are spliced over to the driver pending
1130 * queue yet -- if this happened we acquire the lock
1131 * either before or after the splice happens, but
1132 * need to recheck which of these cases happened.
1133 *
1134 * 2) during session teardown, if the OPERATIONAL bit
1135 * was cleared due to the teardown but the pointer
1136 * hasn't been assigned NULL yet (or we loaded it
1137 * before it was assigned) -- in this case it may
1138 * now be NULL which means we should just let the
1139 * packet pass through because splicing the frames
1140 * back is already done.
1141 */
1142 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1143
1144 if (!tid_tx) {
1145 /* do nothing, let packet pass through */
1146 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1147 reset_agg_timer = true;
1148 } else {
1149 queued = true;
1150 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1151 clear_sta_flag(tx->sta, WLAN_STA_SP);
1152 ps_dbg(tx->sta->sdata,
1153 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1154 tx->sta->sta.addr, tx->sta->sta.aid);
1155 }
1156 info->control.vif = &tx->sdata->vif;
1157 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1158 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1159 __skb_queue_tail(&tid_tx->pending, skb);
1160 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1161 purge_skb = __skb_dequeue(&tid_tx->pending);
1162 }
1163 spin_unlock(&tx->sta->lock);
1164
1165 if (purge_skb)
1166 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1167 }
1168
1169 /* reset session timer */
1170 if (reset_agg_timer)
1171 tid_tx->last_tx = jiffies;
1172
1173 return queued;
1174 }
1175
ieee80211_aggr_check(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)1176 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata,
1177 struct sta_info *sta, struct sk_buff *skb)
1178 {
1179 struct rate_control_ref *ref = sdata->local->rate_ctrl;
1180 u16 tid;
1181
1182 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER))
1183 return;
1184
1185 if (!sta || !sta->sta.deflink.ht_cap.ht_supported ||
1186 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO ||
1187 skb->protocol == sdata->control_port_protocol)
1188 return;
1189
1190 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1191 if (likely(sta->ampdu_mlme.tid_tx[tid]))
1192 return;
1193
1194 ieee80211_start_tx_ba_session(&sta->sta, tid, 0);
1195 }
1196
1197 /*
1198 * initialises @tx
1199 * pass %NULL for the station if unknown, a valid pointer if known
1200 * or an ERR_PTR() if the station is known not to exist
1201 */
1202 static ieee80211_tx_result
ieee80211_tx_prepare(struct ieee80211_sub_if_data * sdata,struct ieee80211_tx_data * tx,struct sta_info * sta,struct sk_buff * skb)1203 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1204 struct ieee80211_tx_data *tx,
1205 struct sta_info *sta, struct sk_buff *skb)
1206 {
1207 struct ieee80211_local *local = sdata->local;
1208 struct ieee80211_hdr *hdr;
1209 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1210 bool aggr_check = false;
1211 int tid;
1212
1213 memset(tx, 0, sizeof(*tx));
1214 tx->skb = skb;
1215 tx->local = local;
1216 tx->sdata = sdata;
1217 __skb_queue_head_init(&tx->skbs);
1218
1219 /*
1220 * If this flag is set to true anywhere, and we get here,
1221 * we are doing the needed processing, so remove the flag
1222 * now.
1223 */
1224 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1225
1226 hdr = (struct ieee80211_hdr *) skb->data;
1227
1228 if (likely(sta)) {
1229 if (!IS_ERR(sta))
1230 tx->sta = sta;
1231 } else {
1232 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1233 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1234 if (!tx->sta && sdata->wdev.use_4addr)
1235 return TX_DROP;
1236 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) {
1237 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1238 }
1239 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) {
1240 tx->sta = sta_info_get(sdata, hdr->addr1);
1241 aggr_check = true;
1242 }
1243 }
1244
1245 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1246 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1247 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1248 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1249 struct tid_ampdu_tx *tid_tx;
1250
1251 tid = ieee80211_get_tid(hdr);
1252 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1253 if (!tid_tx && aggr_check) {
1254 ieee80211_aggr_check(sdata, tx->sta, skb);
1255 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1256 }
1257
1258 if (tid_tx) {
1259 bool queued;
1260
1261 queued = ieee80211_tx_prep_agg(tx, skb, info,
1262 tid_tx, tid);
1263
1264 if (unlikely(queued))
1265 return TX_QUEUED;
1266 }
1267 }
1268
1269 if (is_multicast_ether_addr(hdr->addr1)) {
1270 tx->flags &= ~IEEE80211_TX_UNICAST;
1271 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1272 } else
1273 tx->flags |= IEEE80211_TX_UNICAST;
1274
1275 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1276 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1277 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1278 info->flags & IEEE80211_TX_CTL_AMPDU)
1279 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1280 }
1281
1282 if (!tx->sta)
1283 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1284 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1285 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1286 ieee80211_check_fast_xmit(tx->sta);
1287 }
1288
1289 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1290
1291 return TX_CONTINUE;
1292 }
1293
ieee80211_get_txq(struct ieee80211_local * local,struct ieee80211_vif * vif,struct sta_info * sta,struct sk_buff * skb)1294 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1295 struct ieee80211_vif *vif,
1296 struct sta_info *sta,
1297 struct sk_buff *skb)
1298 {
1299 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1300 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1301 struct ieee80211_txq *txq = NULL;
1302
1303 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1304 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1305 return NULL;
1306
1307 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
1308 unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
1309 if ((!ieee80211_is_mgmt(hdr->frame_control) ||
1310 ieee80211_is_bufferable_mmpdu(skb) ||
1311 vif->type == NL80211_IFTYPE_STATION) &&
1312 sta && sta->uploaded) {
1313 /*
1314 * This will be NULL if the driver didn't set the
1315 * opt-in hardware flag.
1316 */
1317 txq = sta->sta.txq[IEEE80211_NUM_TIDS];
1318 }
1319 } else if (sta) {
1320 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1321
1322 if (!sta->uploaded)
1323 return NULL;
1324
1325 txq = sta->sta.txq[tid];
1326 } else {
1327 txq = vif->txq;
1328 }
1329
1330 if (!txq)
1331 return NULL;
1332
1333 return to_txq_info(txq);
1334 }
1335
ieee80211_set_skb_enqueue_time(struct sk_buff * skb)1336 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1337 {
1338 struct sk_buff *next;
1339 codel_time_t now = codel_get_time();
1340
1341 skb_list_walk_safe(skb, skb, next)
1342 IEEE80211_SKB_CB(skb)->control.enqueue_time = now;
1343 }
1344
codel_skb_len_func(const struct sk_buff * skb)1345 static u32 codel_skb_len_func(const struct sk_buff *skb)
1346 {
1347 return skb->len;
1348 }
1349
codel_skb_time_func(const struct sk_buff * skb)1350 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1351 {
1352 const struct ieee80211_tx_info *info;
1353
1354 info = (const struct ieee80211_tx_info *)skb->cb;
1355 return info->control.enqueue_time;
1356 }
1357
codel_dequeue_func(struct codel_vars * cvars,void * ctx)1358 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1359 void *ctx)
1360 {
1361 struct ieee80211_local *local;
1362 struct txq_info *txqi;
1363 struct fq *fq;
1364 struct fq_flow *flow;
1365
1366 txqi = ctx;
1367 local = vif_to_sdata(txqi->txq.vif)->local;
1368 fq = &local->fq;
1369
1370 if (cvars == &txqi->def_cvars)
1371 flow = &txqi->tin.default_flow;
1372 else
1373 flow = &fq->flows[cvars - local->cvars];
1374
1375 return fq_flow_dequeue(fq, flow);
1376 }
1377
codel_drop_func(struct sk_buff * skb,void * ctx)1378 static void codel_drop_func(struct sk_buff *skb,
1379 void *ctx)
1380 {
1381 struct ieee80211_local *local;
1382 struct ieee80211_hw *hw;
1383 struct txq_info *txqi;
1384
1385 txqi = ctx;
1386 local = vif_to_sdata(txqi->txq.vif)->local;
1387 hw = &local->hw;
1388
1389 ieee80211_free_txskb(hw, skb);
1390 }
1391
fq_tin_dequeue_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow)1392 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1393 struct fq_tin *tin,
1394 struct fq_flow *flow)
1395 {
1396 struct ieee80211_local *local;
1397 struct txq_info *txqi;
1398 struct codel_vars *cvars;
1399 struct codel_params *cparams;
1400 struct codel_stats *cstats;
1401
1402 local = container_of(fq, struct ieee80211_local, fq);
1403 txqi = container_of(tin, struct txq_info, tin);
1404 cstats = &txqi->cstats;
1405
1406 if (txqi->txq.sta) {
1407 struct sta_info *sta = container_of(txqi->txq.sta,
1408 struct sta_info, sta);
1409 cparams = &sta->cparams;
1410 } else {
1411 cparams = &local->cparams;
1412 }
1413
1414 if (flow == &tin->default_flow)
1415 cvars = &txqi->def_cvars;
1416 else
1417 cvars = &local->cvars[flow - fq->flows];
1418
1419 return codel_dequeue(txqi,
1420 &flow->backlog,
1421 cparams,
1422 cvars,
1423 cstats,
1424 codel_skb_len_func,
1425 codel_skb_time_func,
1426 codel_drop_func,
1427 codel_dequeue_func);
1428 }
1429
fq_skb_free_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow,struct sk_buff * skb)1430 static void fq_skb_free_func(struct fq *fq,
1431 struct fq_tin *tin,
1432 struct fq_flow *flow,
1433 struct sk_buff *skb)
1434 {
1435 struct ieee80211_local *local;
1436
1437 local = container_of(fq, struct ieee80211_local, fq);
1438 ieee80211_free_txskb(&local->hw, skb);
1439 }
1440
ieee80211_txq_enqueue(struct ieee80211_local * local,struct txq_info * txqi,struct sk_buff * skb)1441 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1442 struct txq_info *txqi,
1443 struct sk_buff *skb)
1444 {
1445 struct fq *fq = &local->fq;
1446 struct fq_tin *tin = &txqi->tin;
1447 u32 flow_idx = fq_flow_idx(fq, skb);
1448
1449 ieee80211_set_skb_enqueue_time(skb);
1450
1451 spin_lock_bh(&fq->lock);
1452 /*
1453 * For management frames, don't really apply codel etc.,
1454 * we don't want to apply any shaping or anything we just
1455 * want to simplify the driver API by having them on the
1456 * txqi.
1457 */
1458 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) {
1459 IEEE80211_SKB_CB(skb)->control.flags |=
1460 IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
1461 __skb_queue_tail(&txqi->frags, skb);
1462 } else {
1463 fq_tin_enqueue(fq, tin, flow_idx, skb,
1464 fq_skb_free_func);
1465 }
1466 spin_unlock_bh(&fq->lock);
1467 }
1468
fq_vlan_filter_func(struct fq * fq,struct fq_tin * tin,struct fq_flow * flow,struct sk_buff * skb,void * data)1469 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1470 struct fq_flow *flow, struct sk_buff *skb,
1471 void *data)
1472 {
1473 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1474
1475 return info->control.vif == data;
1476 }
1477
ieee80211_txq_remove_vlan(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)1478 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1479 struct ieee80211_sub_if_data *sdata)
1480 {
1481 struct fq *fq = &local->fq;
1482 struct txq_info *txqi;
1483 struct fq_tin *tin;
1484 struct ieee80211_sub_if_data *ap;
1485
1486 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1487 return;
1488
1489 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1490
1491 if (!ap->vif.txq)
1492 return;
1493
1494 txqi = to_txq_info(ap->vif.txq);
1495 tin = &txqi->tin;
1496
1497 spin_lock_bh(&fq->lock);
1498 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1499 fq_skb_free_func);
1500 spin_unlock_bh(&fq->lock);
1501 }
1502
ieee80211_txq_init(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct txq_info * txqi,int tid)1503 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1504 struct sta_info *sta,
1505 struct txq_info *txqi, int tid)
1506 {
1507 fq_tin_init(&txqi->tin);
1508 codel_vars_init(&txqi->def_cvars);
1509 codel_stats_init(&txqi->cstats);
1510 __skb_queue_head_init(&txqi->frags);
1511 INIT_LIST_HEAD(&txqi->schedule_order);
1512
1513 txqi->txq.vif = &sdata->vif;
1514
1515 if (!sta) {
1516 sdata->vif.txq = &txqi->txq;
1517 txqi->txq.tid = 0;
1518 txqi->txq.ac = IEEE80211_AC_BE;
1519
1520 return;
1521 }
1522
1523 if (tid == IEEE80211_NUM_TIDS) {
1524 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1525 /* Drivers need to opt in to the management MPDU TXQ */
1526 if (!ieee80211_hw_check(&sdata->local->hw,
1527 STA_MMPDU_TXQ))
1528 return;
1529 } else if (!ieee80211_hw_check(&sdata->local->hw,
1530 BUFF_MMPDU_TXQ)) {
1531 /* Drivers need to opt in to the bufferable MMPDU TXQ */
1532 return;
1533 }
1534 txqi->txq.ac = IEEE80211_AC_VO;
1535 } else {
1536 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1537 }
1538
1539 txqi->txq.sta = &sta->sta;
1540 txqi->txq.tid = tid;
1541 sta->sta.txq[tid] = &txqi->txq;
1542 }
1543
ieee80211_txq_purge(struct ieee80211_local * local,struct txq_info * txqi)1544 void ieee80211_txq_purge(struct ieee80211_local *local,
1545 struct txq_info *txqi)
1546 {
1547 struct fq *fq = &local->fq;
1548 struct fq_tin *tin = &txqi->tin;
1549
1550 spin_lock_bh(&fq->lock);
1551 fq_tin_reset(fq, tin, fq_skb_free_func);
1552 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1553 spin_unlock_bh(&fq->lock);
1554
1555 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]);
1556 list_del_init(&txqi->schedule_order);
1557 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]);
1558 }
1559
ieee80211_txq_set_params(struct ieee80211_local * local)1560 void ieee80211_txq_set_params(struct ieee80211_local *local)
1561 {
1562 if (local->hw.wiphy->txq_limit)
1563 local->fq.limit = local->hw.wiphy->txq_limit;
1564 else
1565 local->hw.wiphy->txq_limit = local->fq.limit;
1566
1567 if (local->hw.wiphy->txq_memory_limit)
1568 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1569 else
1570 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1571
1572 if (local->hw.wiphy->txq_quantum)
1573 local->fq.quantum = local->hw.wiphy->txq_quantum;
1574 else
1575 local->hw.wiphy->txq_quantum = local->fq.quantum;
1576 }
1577
ieee80211_txq_setup_flows(struct ieee80211_local * local)1578 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1579 {
1580 struct fq *fq = &local->fq;
1581 int ret;
1582 int i;
1583 bool supp_vht = false;
1584 enum nl80211_band band;
1585
1586 ret = fq_init(fq, 4096);
1587 if (ret)
1588 return ret;
1589
1590 /*
1591 * If the hardware doesn't support VHT, it is safe to limit the maximum
1592 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1593 */
1594 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1595 struct ieee80211_supported_band *sband;
1596
1597 sband = local->hw.wiphy->bands[band];
1598 if (!sband)
1599 continue;
1600
1601 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1602 }
1603
1604 if (!supp_vht)
1605 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1606
1607 codel_params_init(&local->cparams);
1608 local->cparams.interval = MS2TIME(100);
1609 local->cparams.target = MS2TIME(20);
1610 local->cparams.ecn = true;
1611
1612 local->cvars = kvcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1613 GFP_KERNEL);
1614 if (!local->cvars) {
1615 spin_lock_bh(&fq->lock);
1616 fq_reset(fq, fq_skb_free_func);
1617 spin_unlock_bh(&fq->lock);
1618 return -ENOMEM;
1619 }
1620
1621 for (i = 0; i < fq->flows_cnt; i++)
1622 codel_vars_init(&local->cvars[i]);
1623
1624 ieee80211_txq_set_params(local);
1625
1626 return 0;
1627 }
1628
ieee80211_txq_teardown_flows(struct ieee80211_local * local)1629 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1630 {
1631 struct fq *fq = &local->fq;
1632
1633 kvfree(local->cvars);
1634 local->cvars = NULL;
1635
1636 spin_lock_bh(&fq->lock);
1637 fq_reset(fq, fq_skb_free_func);
1638 spin_unlock_bh(&fq->lock);
1639 }
1640
ieee80211_queue_skb(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)1641 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1642 struct ieee80211_sub_if_data *sdata,
1643 struct sta_info *sta,
1644 struct sk_buff *skb)
1645 {
1646 struct ieee80211_vif *vif;
1647 struct txq_info *txqi;
1648
1649 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1650 return false;
1651
1652 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1653 sdata = container_of(sdata->bss,
1654 struct ieee80211_sub_if_data, u.ap);
1655
1656 vif = &sdata->vif;
1657 txqi = ieee80211_get_txq(local, vif, sta, skb);
1658
1659 if (!txqi)
1660 return false;
1661
1662 ieee80211_txq_enqueue(local, txqi, skb);
1663
1664 schedule_and_wake_txq(local, txqi);
1665
1666 return true;
1667 }
1668
ieee80211_tx_frags(struct ieee80211_local * local,struct ieee80211_vif * vif,struct sta_info * sta,struct sk_buff_head * skbs,bool txpending)1669 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1670 struct ieee80211_vif *vif,
1671 struct sta_info *sta,
1672 struct sk_buff_head *skbs,
1673 bool txpending)
1674 {
1675 struct ieee80211_tx_control control = {};
1676 struct sk_buff *skb, *tmp;
1677 unsigned long flags;
1678
1679 skb_queue_walk_safe(skbs, skb, tmp) {
1680 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1681 int q = info->hw_queue;
1682
1683 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1684 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1685 __skb_unlink(skb, skbs);
1686 ieee80211_free_txskb(&local->hw, skb);
1687 continue;
1688 }
1689 #endif
1690
1691 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1692 if (local->queue_stop_reasons[q] ||
1693 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1694 if (unlikely(info->flags &
1695 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1696 if (local->queue_stop_reasons[q] &
1697 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1698 /*
1699 * Drop off-channel frames if queues
1700 * are stopped for any reason other
1701 * than off-channel operation. Never
1702 * queue them.
1703 */
1704 spin_unlock_irqrestore(
1705 &local->queue_stop_reason_lock,
1706 flags);
1707 ieee80211_purge_tx_queue(&local->hw,
1708 skbs);
1709 return true;
1710 }
1711 } else {
1712
1713 /*
1714 * Since queue is stopped, queue up frames for
1715 * later transmission from the tx-pending
1716 * tasklet when the queue is woken again.
1717 */
1718 if (txpending)
1719 skb_queue_splice_init(skbs,
1720 &local->pending[q]);
1721 else
1722 skb_queue_splice_tail_init(skbs,
1723 &local->pending[q]);
1724
1725 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1726 flags);
1727 return false;
1728 }
1729 }
1730 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1731
1732 info->control.vif = vif;
1733 control.sta = sta ? &sta->sta : NULL;
1734
1735 __skb_unlink(skb, skbs);
1736 drv_tx(local, &control, skb);
1737 }
1738
1739 return true;
1740 }
1741
1742 /*
1743 * Returns false if the frame couldn't be transmitted but was queued instead.
1744 */
__ieee80211_tx(struct ieee80211_local * local,struct sk_buff_head * skbs,struct sta_info * sta,bool txpending)1745 static bool __ieee80211_tx(struct ieee80211_local *local,
1746 struct sk_buff_head *skbs, struct sta_info *sta,
1747 bool txpending)
1748 {
1749 struct ieee80211_tx_info *info;
1750 struct ieee80211_sub_if_data *sdata;
1751 struct ieee80211_vif *vif;
1752 struct sk_buff *skb;
1753 bool result;
1754
1755 if (WARN_ON(skb_queue_empty(skbs)))
1756 return true;
1757
1758 skb = skb_peek(skbs);
1759 info = IEEE80211_SKB_CB(skb);
1760 sdata = vif_to_sdata(info->control.vif);
1761 if (sta && !sta->uploaded)
1762 sta = NULL;
1763
1764 switch (sdata->vif.type) {
1765 case NL80211_IFTYPE_MONITOR:
1766 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1767 vif = &sdata->vif;
1768 break;
1769 }
1770 sdata = rcu_dereference(local->monitor_sdata);
1771 if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) {
1772 vif = &sdata->vif;
1773 info->hw_queue =
1774 vif->hw_queue[skb_get_queue_mapping(skb)];
1775 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1776 ieee80211_purge_tx_queue(&local->hw, skbs);
1777 return true;
1778 } else
1779 vif = NULL;
1780 break;
1781 case NL80211_IFTYPE_AP_VLAN:
1782 sdata = container_of(sdata->bss,
1783 struct ieee80211_sub_if_data, u.ap);
1784 fallthrough;
1785 default:
1786 vif = &sdata->vif;
1787 break;
1788 }
1789
1790 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending);
1791
1792 WARN_ON_ONCE(!skb_queue_empty(skbs));
1793
1794 return result;
1795 }
1796
1797 /*
1798 * Invoke TX handlers, return 0 on success and non-zero if the
1799 * frame was dropped or queued.
1800 *
1801 * The handlers are split into an early and late part. The latter is everything
1802 * that can be sensitive to reordering, and will be deferred to after packets
1803 * are dequeued from the intermediate queues (when they are enabled).
1804 */
invoke_tx_handlers_early(struct ieee80211_tx_data * tx)1805 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1806 {
1807 ieee80211_tx_result res = TX_DROP;
1808
1809 #define CALL_TXH(txh) \
1810 do { \
1811 res = txh(tx); \
1812 if (res != TX_CONTINUE) \
1813 goto txh_done; \
1814 } while (0)
1815
1816 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1817 CALL_TXH(ieee80211_tx_h_check_assoc);
1818 CALL_TXH(ieee80211_tx_h_ps_buf);
1819 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1820 CALL_TXH(ieee80211_tx_h_select_key);
1821
1822 txh_done:
1823 if (unlikely(res == TX_DROP)) {
1824 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1825 if (tx->skb)
1826 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1827 else
1828 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1829 return -1;
1830 } else if (unlikely(res == TX_QUEUED)) {
1831 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1832 return -1;
1833 }
1834
1835 return 0;
1836 }
1837
1838 /*
1839 * Late handlers can be called while the sta lock is held. Handlers that can
1840 * cause packets to be generated will cause deadlock!
1841 */
invoke_tx_handlers_late(struct ieee80211_tx_data * tx)1842 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1843 {
1844 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1845 ieee80211_tx_result res = TX_CONTINUE;
1846
1847 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1848 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1849
1850 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1851 __skb_queue_tail(&tx->skbs, tx->skb);
1852 tx->skb = NULL;
1853 goto txh_done;
1854 }
1855
1856 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1857 CALL_TXH(ieee80211_tx_h_sequence);
1858 CALL_TXH(ieee80211_tx_h_fragment);
1859 /* handlers after fragment must be aware of tx info fragmentation! */
1860 CALL_TXH(ieee80211_tx_h_stats);
1861 CALL_TXH(ieee80211_tx_h_encrypt);
1862 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1863 CALL_TXH(ieee80211_tx_h_calculate_duration);
1864 #undef CALL_TXH
1865
1866 txh_done:
1867 if (unlikely(res == TX_DROP)) {
1868 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1869 if (tx->skb)
1870 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1871 else
1872 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1873 return -1;
1874 } else if (unlikely(res == TX_QUEUED)) {
1875 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1876 return -1;
1877 }
1878
1879 return 0;
1880 }
1881
invoke_tx_handlers(struct ieee80211_tx_data * tx)1882 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1883 {
1884 int r = invoke_tx_handlers_early(tx);
1885
1886 if (r)
1887 return r;
1888 return invoke_tx_handlers_late(tx);
1889 }
1890
ieee80211_tx_prepare_skb(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct sk_buff * skb,int band,struct ieee80211_sta ** sta)1891 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1892 struct ieee80211_vif *vif, struct sk_buff *skb,
1893 int band, struct ieee80211_sta **sta)
1894 {
1895 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1896 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1897 struct ieee80211_tx_data tx;
1898 struct sk_buff *skb2;
1899
1900 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1901 return false;
1902
1903 info->band = band;
1904 info->control.vif = vif;
1905 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1906
1907 if (invoke_tx_handlers(&tx))
1908 return false;
1909
1910 if (sta) {
1911 if (tx.sta)
1912 *sta = &tx.sta->sta;
1913 else
1914 *sta = NULL;
1915 }
1916
1917 /* this function isn't suitable for fragmented data frames */
1918 skb2 = __skb_dequeue(&tx.skbs);
1919 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1920 ieee80211_free_txskb(hw, skb2);
1921 ieee80211_purge_tx_queue(hw, &tx.skbs);
1922 return false;
1923 }
1924
1925 return true;
1926 }
1927 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1928
1929 /*
1930 * Returns false if the frame couldn't be transmitted but was queued instead.
1931 */
ieee80211_tx(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb,bool txpending)1932 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1933 struct sta_info *sta, struct sk_buff *skb,
1934 bool txpending)
1935 {
1936 struct ieee80211_local *local = sdata->local;
1937 struct ieee80211_tx_data tx;
1938 ieee80211_tx_result res_prepare;
1939 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1940 bool result = true;
1941
1942 if (unlikely(skb->len < 10)) {
1943 dev_kfree_skb(skb);
1944 return true;
1945 }
1946
1947 /* initialises tx */
1948 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1949
1950 if (unlikely(res_prepare == TX_DROP)) {
1951 ieee80211_free_txskb(&local->hw, skb);
1952 return true;
1953 } else if (unlikely(res_prepare == TX_QUEUED)) {
1954 return true;
1955 }
1956
1957 /* set up hw_queue value early */
1958 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1959 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1960 info->hw_queue =
1961 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1962
1963 if (invoke_tx_handlers_early(&tx))
1964 return true;
1965
1966 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1967 return true;
1968
1969 if (!invoke_tx_handlers_late(&tx))
1970 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending);
1971
1972 return result;
1973 }
1974
1975 /* device xmit handlers */
1976
1977 enum ieee80211_encrypt {
1978 ENCRYPT_NO,
1979 ENCRYPT_MGMT,
1980 ENCRYPT_DATA,
1981 };
1982
ieee80211_skb_resize(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int head_need,enum ieee80211_encrypt encrypt)1983 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1984 struct sk_buff *skb,
1985 int head_need,
1986 enum ieee80211_encrypt encrypt)
1987 {
1988 struct ieee80211_local *local = sdata->local;
1989 bool enc_tailroom;
1990 int tail_need = 0;
1991
1992 enc_tailroom = encrypt == ENCRYPT_MGMT ||
1993 (encrypt == ENCRYPT_DATA &&
1994 sdata->crypto_tx_tailroom_needed_cnt);
1995
1996 if (enc_tailroom) {
1997 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1998 tail_need -= skb_tailroom(skb);
1999 tail_need = max_t(int, tail_need, 0);
2000 }
2001
2002 if (skb_cloned(skb) &&
2003 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
2004 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
2005 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
2006 else if (head_need || tail_need)
2007 I802_DEBUG_INC(local->tx_expand_skb_head);
2008 else
2009 return 0;
2010
2011 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
2012 wiphy_debug(local->hw.wiphy,
2013 "failed to reallocate TX buffer\n");
2014 return -ENOMEM;
2015 }
2016
2017 return 0;
2018 }
2019
ieee80211_xmit(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct sk_buff * skb)2020 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
2021 struct sta_info *sta, struct sk_buff *skb)
2022 {
2023 struct ieee80211_local *local = sdata->local;
2024 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2025 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
2026 int headroom;
2027 enum ieee80211_encrypt encrypt;
2028
2029 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)
2030 encrypt = ENCRYPT_NO;
2031 else if (ieee80211_is_mgmt(hdr->frame_control))
2032 encrypt = ENCRYPT_MGMT;
2033 else
2034 encrypt = ENCRYPT_DATA;
2035
2036 headroom = local->tx_headroom;
2037 if (encrypt != ENCRYPT_NO)
2038 headroom += IEEE80211_ENCRYPT_HEADROOM;
2039 headroom -= skb_headroom(skb);
2040 headroom = max_t(int, 0, headroom);
2041
2042 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) {
2043 ieee80211_free_txskb(&local->hw, skb);
2044 return;
2045 }
2046
2047 /* reload after potential resize */
2048 hdr = (struct ieee80211_hdr *) skb->data;
2049 info->control.vif = &sdata->vif;
2050
2051 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2052 if (ieee80211_is_data(hdr->frame_control) &&
2053 is_unicast_ether_addr(hdr->addr1)) {
2054 if (mesh_nexthop_resolve(sdata, skb))
2055 return; /* skb queued: don't free */
2056 } else {
2057 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2058 }
2059 }
2060
2061 ieee80211_set_qos_hdr(sdata, skb);
2062 ieee80211_tx(sdata, sta, skb, false);
2063 }
2064
ieee80211_validate_radiotap_len(struct sk_buff * skb)2065 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb)
2066 {
2067 struct ieee80211_radiotap_header *rthdr =
2068 (struct ieee80211_radiotap_header *)skb->data;
2069
2070 /* check for not even having the fixed radiotap header part */
2071 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2072 return false; /* too short to be possibly valid */
2073
2074 /* is it a header version we can trust to find length from? */
2075 if (unlikely(rthdr->it_version))
2076 return false; /* only version 0 is supported */
2077
2078 /* does the skb contain enough to deliver on the alleged length? */
2079 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data)))
2080 return false; /* skb too short for claimed rt header extent */
2081
2082 return true;
2083 }
2084
ieee80211_parse_tx_radiotap(struct sk_buff * skb,struct net_device * dev)2085 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb,
2086 struct net_device *dev)
2087 {
2088 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2089 struct ieee80211_radiotap_iterator iterator;
2090 struct ieee80211_radiotap_header *rthdr =
2091 (struct ieee80211_radiotap_header *) skb->data;
2092 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2093 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2094 NULL);
2095 u16 txflags;
2096 u16 rate = 0;
2097 bool rate_found = false;
2098 u8 rate_retries = 0;
2099 u16 rate_flags = 0;
2100 u8 mcs_known, mcs_flags, mcs_bw;
2101 u16 vht_known;
2102 u8 vht_mcs = 0, vht_nss = 0;
2103 int i;
2104
2105 if (!ieee80211_validate_radiotap_len(skb))
2106 return false;
2107
2108 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2109 IEEE80211_TX_CTL_DONTFRAG;
2110
2111 /*
2112 * for every radiotap entry that is present
2113 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2114 * entries present, or -EINVAL on error)
2115 */
2116
2117 while (!ret) {
2118 ret = ieee80211_radiotap_iterator_next(&iterator);
2119
2120 if (ret)
2121 continue;
2122
2123 /* see if this argument is something we can use */
2124 switch (iterator.this_arg_index) {
2125 /*
2126 * You must take care when dereferencing iterator.this_arg
2127 * for multibyte types... the pointer is not aligned. Use
2128 * get_unaligned((type *)iterator.this_arg) to dereference
2129 * iterator.this_arg for type "type" safely on all arches.
2130 */
2131 case IEEE80211_RADIOTAP_FLAGS:
2132 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2133 /*
2134 * this indicates that the skb we have been
2135 * handed has the 32-bit FCS CRC at the end...
2136 * we should react to that by snipping it off
2137 * because it will be recomputed and added
2138 * on transmission
2139 */
2140 if (skb->len < (iterator._max_length + FCS_LEN))
2141 return false;
2142
2143 skb_trim(skb, skb->len - FCS_LEN);
2144 }
2145 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2146 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2147 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2148 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2149 break;
2150
2151 case IEEE80211_RADIOTAP_TX_FLAGS:
2152 txflags = get_unaligned_le16(iterator.this_arg);
2153 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2154 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2155 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO)
2156 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
2157 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER)
2158 info->control.flags |=
2159 IEEE80211_TX_CTRL_DONT_REORDER;
2160 break;
2161
2162 case IEEE80211_RADIOTAP_RATE:
2163 rate = *iterator.this_arg;
2164 rate_flags = 0;
2165 rate_found = true;
2166 break;
2167
2168 case IEEE80211_RADIOTAP_ANTENNA:
2169 /* this can appear multiple times, keep a bitmap */
2170 info->control.antennas |= BIT(*iterator.this_arg);
2171 break;
2172
2173 case IEEE80211_RADIOTAP_DATA_RETRIES:
2174 rate_retries = *iterator.this_arg;
2175 break;
2176
2177 case IEEE80211_RADIOTAP_MCS:
2178 mcs_known = iterator.this_arg[0];
2179 mcs_flags = iterator.this_arg[1];
2180 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2181 break;
2182
2183 rate_found = true;
2184 rate = iterator.this_arg[2];
2185 rate_flags = IEEE80211_TX_RC_MCS;
2186
2187 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2188 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2189 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2190
2191 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2192 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2193 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2194 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2195
2196 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC &&
2197 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC)
2198 info->flags |= IEEE80211_TX_CTL_LDPC;
2199
2200 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) {
2201 u8 stbc = u8_get_bits(mcs_flags,
2202 IEEE80211_RADIOTAP_MCS_STBC_MASK);
2203
2204 info->flags |=
2205 u32_encode_bits(stbc,
2206 IEEE80211_TX_CTL_STBC);
2207 }
2208 break;
2209
2210 case IEEE80211_RADIOTAP_VHT:
2211 vht_known = get_unaligned_le16(iterator.this_arg);
2212 rate_found = true;
2213
2214 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2215 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2216 (iterator.this_arg[2] &
2217 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2218 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2219 if (vht_known &
2220 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2221 if (iterator.this_arg[3] == 1)
2222 rate_flags |=
2223 IEEE80211_TX_RC_40_MHZ_WIDTH;
2224 else if (iterator.this_arg[3] == 4)
2225 rate_flags |=
2226 IEEE80211_TX_RC_80_MHZ_WIDTH;
2227 else if (iterator.this_arg[3] == 11)
2228 rate_flags |=
2229 IEEE80211_TX_RC_160_MHZ_WIDTH;
2230 }
2231
2232 vht_mcs = iterator.this_arg[4] >> 4;
2233 if (vht_mcs > 11)
2234 vht_mcs = 0;
2235 vht_nss = iterator.this_arg[4] & 0xF;
2236 if (!vht_nss || vht_nss > 8)
2237 vht_nss = 1;
2238 break;
2239
2240 /*
2241 * Please update the file
2242 * Documentation/networking/mac80211-injection.rst
2243 * when parsing new fields here.
2244 */
2245
2246 default:
2247 break;
2248 }
2249 }
2250
2251 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2252 return false;
2253
2254 if (rate_found) {
2255 struct ieee80211_supported_band *sband =
2256 local->hw.wiphy->bands[info->band];
2257
2258 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2259
2260 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2261 info->control.rates[i].idx = -1;
2262 info->control.rates[i].flags = 0;
2263 info->control.rates[i].count = 0;
2264 }
2265
2266 if (rate_flags & IEEE80211_TX_RC_MCS) {
2267 /* reset antennas if not enough */
2268 if (IEEE80211_HT_MCS_CHAINS(rate) >
2269 hweight8(info->control.antennas))
2270 info->control.antennas = 0;
2271
2272 info->control.rates[0].idx = rate;
2273 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2274 /* reset antennas if not enough */
2275 if (vht_nss > hweight8(info->control.antennas))
2276 info->control.antennas = 0;
2277
2278 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2279 vht_nss);
2280 } else if (sband) {
2281 for (i = 0; i < sband->n_bitrates; i++) {
2282 if (rate * 5 != sband->bitrates[i].bitrate)
2283 continue;
2284
2285 info->control.rates[0].idx = i;
2286 break;
2287 }
2288 }
2289
2290 if (info->control.rates[0].idx < 0)
2291 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2292
2293 info->control.rates[0].flags = rate_flags;
2294 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2295 local->hw.max_rate_tries);
2296 }
2297
2298 return true;
2299 }
2300
ieee80211_monitor_start_xmit(struct sk_buff * skb,struct net_device * dev)2301 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2302 struct net_device *dev)
2303 {
2304 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2305 struct ieee80211_chanctx_conf *chanctx_conf;
2306 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2307 struct ieee80211_hdr *hdr;
2308 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2309 struct cfg80211_chan_def *chandef;
2310 u16 len_rthdr;
2311 int hdrlen;
2312
2313 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2314 if (unlikely(!ieee80211_sdata_running(sdata)))
2315 goto fail;
2316
2317 memset(info, 0, sizeof(*info));
2318 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2319 IEEE80211_TX_CTL_INJECTED;
2320
2321 /* Sanity-check the length of the radiotap header */
2322 if (!ieee80211_validate_radiotap_len(skb))
2323 goto fail;
2324
2325 /* we now know there is a radiotap header with a length we can use */
2326 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2327
2328 /*
2329 * fix up the pointers accounting for the radiotap
2330 * header still being in there. We are being given
2331 * a precooked IEEE80211 header so no need for
2332 * normal processing
2333 */
2334 skb_set_mac_header(skb, len_rthdr);
2335 /*
2336 * these are just fixed to the end of the rt area since we
2337 * don't have any better information and at this point, nobody cares
2338 */
2339 skb_set_network_header(skb, len_rthdr);
2340 skb_set_transport_header(skb, len_rthdr);
2341
2342 if (skb->len < len_rthdr + 2)
2343 goto fail;
2344
2345 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2346 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2347
2348 if (skb->len < len_rthdr + hdrlen)
2349 goto fail;
2350
2351 /*
2352 * Initialize skb->protocol if the injected frame is a data frame
2353 * carrying a rfc1042 header
2354 */
2355 if (ieee80211_is_data(hdr->frame_control) &&
2356 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2357 u8 *payload = (u8 *)hdr + hdrlen;
2358
2359 if (ether_addr_equal(payload, rfc1042_header))
2360 skb->protocol = cpu_to_be16((payload[6] << 8) |
2361 payload[7]);
2362 }
2363
2364 rcu_read_lock();
2365
2366 /*
2367 * We process outgoing injected frames that have a local address
2368 * we handle as though they are non-injected frames.
2369 * This code here isn't entirely correct, the local MAC address
2370 * isn't always enough to find the interface to use; for proper
2371 * VLAN support we have an nl80211-based mechanism.
2372 *
2373 * This is necessary, for example, for old hostapd versions that
2374 * don't use nl80211-based management TX/RX.
2375 */
2376 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2377 if (!ieee80211_sdata_running(tmp_sdata))
2378 continue;
2379 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2380 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2381 continue;
2382 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2383 sdata = tmp_sdata;
2384 break;
2385 }
2386 }
2387
2388 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2389 if (!chanctx_conf) {
2390 tmp_sdata = rcu_dereference(local->monitor_sdata);
2391 if (tmp_sdata)
2392 chanctx_conf =
2393 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf);
2394 }
2395
2396 if (chanctx_conf)
2397 chandef = &chanctx_conf->def;
2398 else
2399 goto fail_rcu;
2400
2401 /*
2402 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still
2403 * shouldn't transmit on disabled channels.
2404 */
2405 if (!cfg80211_chandef_usable(local->hw.wiphy, chandef,
2406 IEEE80211_CHAN_DISABLED))
2407 goto fail_rcu;
2408
2409 /*
2410 * Frame injection is not allowed if beaconing is not allowed
2411 * or if we need radar detection. Beaconing is usually not allowed when
2412 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2413 * Passive scan is also used in world regulatory domains where
2414 * your country is not known and as such it should be treated as
2415 * NO TX unless the channel is explicitly allowed in which case
2416 * your current regulatory domain would not have the passive scan
2417 * flag.
2418 *
2419 * Since AP mode uses monitor interfaces to inject/TX management
2420 * frames we can make AP mode the exception to this rule once it
2421 * supports radar detection as its implementation can deal with
2422 * radar detection by itself. We can do that later by adding a
2423 * monitor flag interfaces used for AP support.
2424 */
2425 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2426 sdata->vif.type))
2427 goto fail_rcu;
2428
2429 info->band = chandef->chan->band;
2430
2431 /* Initialize skb->priority according to frame type and TID class,
2432 * with respect to the sub interface that the frame will actually
2433 * be transmitted on. If the DONT_REORDER flag is set, the original
2434 * skb-priority is preserved to assure frames injected with this
2435 * flag are not reordered relative to each other.
2436 */
2437 ieee80211_select_queue_80211(sdata, skb, hdr);
2438 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority));
2439
2440 /*
2441 * Process the radiotap header. This will now take into account the
2442 * selected chandef above to accurately set injection rates and
2443 * retransmissions.
2444 */
2445 if (!ieee80211_parse_tx_radiotap(skb, dev))
2446 goto fail_rcu;
2447
2448 /* remove the injection radiotap header */
2449 skb_pull(skb, len_rthdr);
2450
2451 ieee80211_xmit(sdata, NULL, skb);
2452 rcu_read_unlock();
2453
2454 return NETDEV_TX_OK;
2455
2456 fail_rcu:
2457 rcu_read_unlock();
2458 fail:
2459 dev_kfree_skb(skb);
2460 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2461 }
2462
ieee80211_is_tdls_setup(struct sk_buff * skb)2463 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2464 {
2465 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2466
2467 return ethertype == ETH_P_TDLS &&
2468 skb->len > 14 &&
2469 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2470 }
2471
ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct sta_info ** sta_out)2472 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2473 struct sk_buff *skb,
2474 struct sta_info **sta_out)
2475 {
2476 struct sta_info *sta;
2477
2478 switch (sdata->vif.type) {
2479 case NL80211_IFTYPE_AP_VLAN:
2480 sta = rcu_dereference(sdata->u.vlan.sta);
2481 if (sta) {
2482 *sta_out = sta;
2483 return 0;
2484 } else if (sdata->wdev.use_4addr) {
2485 return -ENOLINK;
2486 }
2487 fallthrough;
2488 case NL80211_IFTYPE_AP:
2489 case NL80211_IFTYPE_OCB:
2490 case NL80211_IFTYPE_ADHOC:
2491 if (is_multicast_ether_addr(skb->data)) {
2492 *sta_out = ERR_PTR(-ENOENT);
2493 return 0;
2494 }
2495 sta = sta_info_get_bss(sdata, skb->data);
2496 break;
2497 #ifdef CONFIG_MAC80211_MESH
2498 case NL80211_IFTYPE_MESH_POINT:
2499 /* determined much later */
2500 *sta_out = NULL;
2501 return 0;
2502 #endif
2503 case NL80211_IFTYPE_STATION:
2504 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2505 sta = sta_info_get(sdata, skb->data);
2506 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2507 if (test_sta_flag(sta,
2508 WLAN_STA_TDLS_PEER_AUTH)) {
2509 *sta_out = sta;
2510 return 0;
2511 }
2512
2513 /*
2514 * TDLS link during setup - throw out frames to
2515 * peer. Allow TDLS-setup frames to unauthorized
2516 * peers for the special case of a link teardown
2517 * after a TDLS sta is removed due to being
2518 * unreachable.
2519 */
2520 if (!ieee80211_is_tdls_setup(skb))
2521 return -EINVAL;
2522 }
2523
2524 }
2525
2526 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
2527 if (!sta)
2528 return -ENOLINK;
2529 break;
2530 default:
2531 return -EINVAL;
2532 }
2533
2534 *sta_out = sta ?: ERR_PTR(-ENOENT);
2535 return 0;
2536 }
2537
ieee80211_store_ack_skb(struct ieee80211_local * local,struct sk_buff * skb,u32 * info_flags,u64 * cookie)2538 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local,
2539 struct sk_buff *skb,
2540 u32 *info_flags,
2541 u64 *cookie)
2542 {
2543 struct sk_buff *ack_skb;
2544 u16 info_id = 0;
2545
2546 if (skb->sk)
2547 ack_skb = skb_clone_sk(skb);
2548 else
2549 ack_skb = skb_clone(skb, GFP_ATOMIC);
2550
2551 if (ack_skb) {
2552 unsigned long flags;
2553 int id;
2554
2555 spin_lock_irqsave(&local->ack_status_lock, flags);
2556 id = idr_alloc(&local->ack_status_frames, ack_skb,
2557 1, 0x2000, GFP_ATOMIC);
2558 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2559
2560 if (id >= 0) {
2561 info_id = id;
2562 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2563 if (cookie) {
2564 *cookie = ieee80211_mgmt_tx_cookie(local);
2565 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie;
2566 }
2567 } else {
2568 kfree_skb(ack_skb);
2569 }
2570 }
2571
2572 return info_id;
2573 }
2574
2575 /**
2576 * ieee80211_build_hdr - build 802.11 header in the given frame
2577 * @sdata: virtual interface to build the header for
2578 * @skb: the skb to build the header in
2579 * @info_flags: skb flags to set
2580 * @sta: the station pointer
2581 * @ctrl_flags: info control flags to set
2582 * @cookie: cookie pointer to fill (if not %NULL)
2583 *
2584 * This function takes the skb with 802.3 header and reformats the header to
2585 * the appropriate IEEE 802.11 header based on which interface the packet is
2586 * being transmitted on.
2587 *
2588 * Note that this function also takes care of the TX status request and
2589 * potential unsharing of the SKB - this needs to be interleaved with the
2590 * header building.
2591 *
2592 * The function requires the read-side RCU lock held
2593 *
2594 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2595 */
ieee80211_build_hdr(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 info_flags,struct sta_info * sta,u32 ctrl_flags,u64 * cookie)2596 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2597 struct sk_buff *skb, u32 info_flags,
2598 struct sta_info *sta, u32 ctrl_flags,
2599 u64 *cookie)
2600 {
2601 struct ieee80211_local *local = sdata->local;
2602 struct ieee80211_tx_info *info;
2603 int head_need;
2604 u16 ethertype, hdrlen, meshhdrlen = 0;
2605 __le16 fc;
2606 struct ieee80211_hdr hdr;
2607 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2608 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2609 const u8 *encaps_data;
2610 int encaps_len, skip_header_bytes;
2611 bool wme_sta = false, authorized = false;
2612 bool tdls_peer;
2613 bool multicast;
2614 u16 info_id = 0;
2615 struct ieee80211_chanctx_conf *chanctx_conf = NULL;
2616 enum nl80211_band band;
2617 int ret;
2618 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK);
2619
2620 if (IS_ERR(sta))
2621 sta = NULL;
2622
2623 #ifdef CONFIG_MAC80211_DEBUGFS
2624 if (local->force_tx_status)
2625 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2626 #endif
2627
2628 /* convert Ethernet header to proper 802.11 header (based on
2629 * operation mode) */
2630 ethertype = (skb->data[12] << 8) | skb->data[13];
2631 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2632
2633 if (!ieee80211_vif_is_mld(&sdata->vif))
2634 chanctx_conf =
2635 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
2636
2637 switch (sdata->vif.type) {
2638 case NL80211_IFTYPE_AP_VLAN:
2639 if (sdata->wdev.use_4addr) {
2640 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2641 /* RA TA DA SA */
2642 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2643 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2644 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2645 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2646 hdrlen = 30;
2647 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2648 wme_sta = sta->sta.wme;
2649 }
2650 if (!ieee80211_vif_is_mld(&sdata->vif)) {
2651 struct ieee80211_sub_if_data *ap_sdata;
2652
2653 /* override chanctx_conf from AP (we don't have one) */
2654 ap_sdata = container_of(sdata->bss,
2655 struct ieee80211_sub_if_data,
2656 u.ap);
2657 chanctx_conf =
2658 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf);
2659 }
2660 if (sdata->wdev.use_4addr)
2661 break;
2662 fallthrough;
2663 case NL80211_IFTYPE_AP:
2664 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2665 /* DA BSSID SA */
2666 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2667
2668 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) {
2669 struct ieee80211_link_data *link;
2670
2671 link_id = sta->deflink.link_id;
2672 link = rcu_dereference(sdata->link[link_id]);
2673 if (WARN_ON(!link)) {
2674 ret = -ENOLINK;
2675 goto free;
2676 }
2677 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN);
2678 } else if (link_id == IEEE80211_LINK_UNSPECIFIED ||
2679 (sta && sta->sta.mlo)) {
2680 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2681 } else {
2682 struct ieee80211_bss_conf *conf;
2683
2684 conf = rcu_dereference(sdata->vif.link_conf[link_id]);
2685 if (unlikely(!conf)) {
2686 ret = -ENOLINK;
2687 goto free;
2688 }
2689
2690 memcpy(hdr.addr2, conf->addr, ETH_ALEN);
2691 }
2692
2693 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2694 hdrlen = 24;
2695 break;
2696 #ifdef CONFIG_MAC80211_MESH
2697 case NL80211_IFTYPE_MESH_POINT:
2698 if (!is_multicast_ether_addr(skb->data)) {
2699 struct sta_info *next_hop;
2700 bool mpp_lookup = true;
2701
2702 mpath = mesh_path_lookup(sdata, skb->data);
2703 if (mpath) {
2704 mpp_lookup = false;
2705 next_hop = rcu_dereference(mpath->next_hop);
2706 if (!next_hop ||
2707 !(mpath->flags & (MESH_PATH_ACTIVE |
2708 MESH_PATH_RESOLVING)))
2709 mpp_lookup = true;
2710 }
2711
2712 if (mpp_lookup) {
2713 mppath = mpp_path_lookup(sdata, skb->data);
2714 if (mppath)
2715 mppath->exp_time = jiffies;
2716 }
2717
2718 if (mppath && mpath)
2719 mesh_path_del(sdata, mpath->dst);
2720 }
2721
2722 /*
2723 * Use address extension if it is a packet from
2724 * another interface or if we know the destination
2725 * is being proxied by a portal (i.e. portal address
2726 * differs from proxied address)
2727 */
2728 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2729 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2730 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2731 skb->data, skb->data + ETH_ALEN);
2732 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2733 NULL, NULL);
2734 } else {
2735 /* DS -> MBSS (802.11-2012 13.11.3.3).
2736 * For unicast with unknown forwarding information,
2737 * destination might be in the MBSS or if that fails
2738 * forwarded to another mesh gate. In either case
2739 * resolution will be handled in ieee80211_xmit(), so
2740 * leave the original DA. This also works for mcast */
2741 const u8 *mesh_da = skb->data;
2742
2743 if (mppath)
2744 mesh_da = mppath->mpp;
2745 else if (mpath)
2746 mesh_da = mpath->dst;
2747
2748 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2749 mesh_da, sdata->vif.addr);
2750 if (is_multicast_ether_addr(mesh_da))
2751 /* DA TA mSA AE:SA */
2752 meshhdrlen = ieee80211_new_mesh_header(
2753 sdata, &mesh_hdr,
2754 skb->data + ETH_ALEN, NULL);
2755 else
2756 /* RA TA mDA mSA AE:DA SA */
2757 meshhdrlen = ieee80211_new_mesh_header(
2758 sdata, &mesh_hdr, skb->data,
2759 skb->data + ETH_ALEN);
2760
2761 }
2762
2763 /* For injected frames, fill RA right away as nexthop lookup
2764 * will be skipped.
2765 */
2766 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) &&
2767 is_zero_ether_addr(hdr.addr1))
2768 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2769 break;
2770 #endif
2771 case NL80211_IFTYPE_STATION:
2772 /* we already did checks when looking up the RA STA */
2773 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2774
2775 if (tdls_peer) {
2776 /* For TDLS only one link can be valid with peer STA */
2777 int tdls_link_id = ieee80211_tdls_sta_link_id(sta);
2778 struct ieee80211_link_data *link;
2779
2780 /* DA SA BSSID */
2781 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2782 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2783 link = rcu_dereference(sdata->link[tdls_link_id]);
2784 if (WARN_ON_ONCE(!link)) {
2785 ret = -EINVAL;
2786 goto free;
2787 }
2788 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN);
2789 hdrlen = 24;
2790 } else if (sdata->u.mgd.use_4addr &&
2791 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2792 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2793 IEEE80211_FCTL_TODS);
2794 /* RA TA DA SA */
2795 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN);
2796 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2797 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2798 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2799 hdrlen = 30;
2800 } else {
2801 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2802 /* BSSID SA DA */
2803 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN);
2804 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2805 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2806 hdrlen = 24;
2807 }
2808 break;
2809 case NL80211_IFTYPE_OCB:
2810 /* DA SA BSSID */
2811 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2812 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2813 eth_broadcast_addr(hdr.addr3);
2814 hdrlen = 24;
2815 break;
2816 case NL80211_IFTYPE_ADHOC:
2817 /* DA SA BSSID */
2818 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2819 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2820 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2821 hdrlen = 24;
2822 break;
2823 default:
2824 ret = -EINVAL;
2825 goto free;
2826 }
2827
2828 if (!chanctx_conf) {
2829 if (!ieee80211_vif_is_mld(&sdata->vif)) {
2830 ret = -ENOTCONN;
2831 goto free;
2832 }
2833 /* MLD transmissions must not rely on the band */
2834 band = 0;
2835 } else {
2836 band = chanctx_conf->def.chan->band;
2837 }
2838
2839 multicast = is_multicast_ether_addr(hdr.addr1);
2840
2841 /* sta is always NULL for mesh */
2842 if (sta) {
2843 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2844 wme_sta = sta->sta.wme;
2845 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2846 /* For mesh, the use of the QoS header is mandatory */
2847 wme_sta = true;
2848 }
2849
2850 /* receiver does QoS (which also means we do) use it */
2851 if (wme_sta) {
2852 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2853 hdrlen += 2;
2854 }
2855
2856 /*
2857 * Drop unicast frames to unauthorised stations unless they are
2858 * EAPOL frames from the local station.
2859 */
2860 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2861 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2862 !multicast && !authorized &&
2863 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2864 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) {
2865 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2866 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2867 sdata->name, hdr.addr1);
2868 #endif
2869
2870 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2871
2872 ret = -EPERM;
2873 goto free;
2874 }
2875
2876 if (unlikely(!multicast &&
2877 ((skb->sk &&
2878 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) ||
2879 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS)))
2880 info_id = ieee80211_store_ack_skb(local, skb, &info_flags,
2881 cookie);
2882
2883 /*
2884 * If the skb is shared we need to obtain our own copy.
2885 */
2886 skb = skb_share_check(skb, GFP_ATOMIC);
2887 if (unlikely(!skb)) {
2888 ret = -ENOMEM;
2889 goto free;
2890 }
2891
2892 hdr.frame_control = fc;
2893 hdr.duration_id = 0;
2894 hdr.seq_ctrl = 0;
2895
2896 skip_header_bytes = ETH_HLEN;
2897 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2898 encaps_data = bridge_tunnel_header;
2899 encaps_len = sizeof(bridge_tunnel_header);
2900 skip_header_bytes -= 2;
2901 } else if (ethertype >= ETH_P_802_3_MIN) {
2902 encaps_data = rfc1042_header;
2903 encaps_len = sizeof(rfc1042_header);
2904 skip_header_bytes -= 2;
2905 } else {
2906 encaps_data = NULL;
2907 encaps_len = 0;
2908 }
2909
2910 skb_pull(skb, skip_header_bytes);
2911 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2912
2913 /*
2914 * So we need to modify the skb header and hence need a copy of
2915 * that. The head_need variable above doesn't, so far, include
2916 * the needed header space that we don't need right away. If we
2917 * can, then we don't reallocate right now but only after the
2918 * frame arrives at the master device (if it does...)
2919 *
2920 * If we cannot, however, then we will reallocate to include all
2921 * the ever needed space. Also, if we need to reallocate it anyway,
2922 * make it big enough for everything we may ever need.
2923 */
2924
2925 if (head_need > 0 || skb_cloned(skb)) {
2926 head_need += IEEE80211_ENCRYPT_HEADROOM;
2927 head_need += local->tx_headroom;
2928 head_need = max_t(int, 0, head_need);
2929 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) {
2930 ieee80211_free_txskb(&local->hw, skb);
2931 skb = NULL;
2932 return ERR_PTR(-ENOMEM);
2933 }
2934 }
2935
2936 if (encaps_data)
2937 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2938
2939 #ifdef CONFIG_MAC80211_MESH
2940 if (meshhdrlen > 0)
2941 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2942 #endif
2943
2944 if (ieee80211_is_data_qos(fc)) {
2945 __le16 *qos_control;
2946
2947 qos_control = skb_push(skb, 2);
2948 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2949 /*
2950 * Maybe we could actually set some fields here, for now just
2951 * initialise to zero to indicate no special operation.
2952 */
2953 *qos_control = 0;
2954 } else
2955 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2956
2957 skb_reset_mac_header(skb);
2958
2959 info = IEEE80211_SKB_CB(skb);
2960 memset(info, 0, sizeof(*info));
2961
2962 info->flags = info_flags;
2963 if (info_id) {
2964 info->status_data = info_id;
2965 info->status_data_idr = 1;
2966 }
2967 info->band = band;
2968
2969 if (likely(!cookie)) {
2970 ctrl_flags |= u32_encode_bits(link_id,
2971 IEEE80211_TX_CTRL_MLO_LINK);
2972 } else {
2973 unsigned int pre_conf_link_id;
2974
2975 /*
2976 * ctrl_flags already have been set by
2977 * ieee80211_tx_control_port(), here
2978 * we just sanity check that
2979 */
2980
2981 pre_conf_link_id = u32_get_bits(ctrl_flags,
2982 IEEE80211_TX_CTRL_MLO_LINK);
2983
2984 if (pre_conf_link_id != link_id &&
2985 link_id != IEEE80211_LINK_UNSPECIFIED) {
2986 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2987 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n",
2988 sdata->name, hdr.addr1,
2989 pre_conf_link_id, link_id);
2990 #endif
2991 ret = -EINVAL;
2992 goto free;
2993 }
2994 }
2995
2996 info->control.flags = ctrl_flags;
2997
2998 return skb;
2999 free:
3000 kfree_skb(skb);
3001 return ERR_PTR(ret);
3002 }
3003
3004 /*
3005 * fast-xmit overview
3006 *
3007 * The core idea of this fast-xmit is to remove per-packet checks by checking
3008 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
3009 * checks that are needed to get the sta->fast_tx pointer assigned, after which
3010 * much less work can be done per packet. For example, fragmentation must be
3011 * disabled or the fast_tx pointer will not be set. All the conditions are seen
3012 * in the code here.
3013 *
3014 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
3015 * header and other data to aid packet processing in ieee80211_xmit_fast().
3016 *
3017 * The most difficult part of this is that when any of these assumptions
3018 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
3019 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
3020 * since the per-packet code no longer checks the conditions. This is reflected
3021 * by the calls to these functions throughout the rest of the code, and must be
3022 * maintained if any of the TX path checks change.
3023 */
3024
ieee80211_check_fast_xmit(struct sta_info * sta)3025 void ieee80211_check_fast_xmit(struct sta_info *sta)
3026 {
3027 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
3028 struct ieee80211_local *local = sta->local;
3029 struct ieee80211_sub_if_data *sdata = sta->sdata;
3030 struct ieee80211_hdr *hdr = (void *)build.hdr;
3031 struct ieee80211_chanctx_conf *chanctx_conf;
3032 __le16 fc;
3033
3034 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
3035 return;
3036
3037 if (ieee80211_vif_is_mesh(&sdata->vif))
3038 mesh_fast_tx_flush_sta(sdata, sta);
3039
3040 /* Locking here protects both the pointer itself, and against concurrent
3041 * invocations winning data access races to, e.g., the key pointer that
3042 * is used.
3043 * Without it, the invocation of this function right after the key
3044 * pointer changes wouldn't be sufficient, as another CPU could access
3045 * the pointer, then stall, and then do the cache update after the CPU
3046 * that invalidated the key.
3047 * With the locking, such scenarios cannot happen as the check for the
3048 * key and the fast-tx assignment are done atomically, so the CPU that
3049 * modifies the key will either wait or other one will see the key
3050 * cleared/changed already.
3051 */
3052 spin_lock_bh(&sta->lock);
3053 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
3054 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
3055 sdata->vif.type == NL80211_IFTYPE_STATION)
3056 goto out;
3057
3058 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded)
3059 goto out;
3060
3061 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
3062 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
3063 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
3064 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
3065 goto out;
3066
3067 if (sdata->noack_map)
3068 goto out;
3069
3070 /* fast-xmit doesn't handle fragmentation at all */
3071 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
3072 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
3073 goto out;
3074
3075 if (!ieee80211_vif_is_mld(&sdata->vif)) {
3076 rcu_read_lock();
3077 chanctx_conf =
3078 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
3079 if (!chanctx_conf) {
3080 rcu_read_unlock();
3081 goto out;
3082 }
3083 build.band = chanctx_conf->def.chan->band;
3084 rcu_read_unlock();
3085 } else {
3086 /* MLD transmissions must not rely on the band */
3087 build.band = 0;
3088 }
3089
3090 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
3091
3092 switch (sdata->vif.type) {
3093 case NL80211_IFTYPE_ADHOC:
3094 /* DA SA BSSID */
3095 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3096 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3097 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
3098 build.hdr_len = 24;
3099 break;
3100 case NL80211_IFTYPE_STATION:
3101 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
3102 /* For TDLS only one link can be valid with peer STA */
3103 int tdls_link_id = ieee80211_tdls_sta_link_id(sta);
3104 struct ieee80211_link_data *link;
3105
3106 /* DA SA BSSID */
3107 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3108 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3109 rcu_read_lock();
3110 link = rcu_dereference(sdata->link[tdls_link_id]);
3111 if (!WARN_ON_ONCE(!link))
3112 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN);
3113 rcu_read_unlock();
3114 build.hdr_len = 24;
3115 break;
3116 }
3117
3118 if (sdata->u.mgd.use_4addr) {
3119 /* non-regular ethertype cannot use the fastpath */
3120 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
3121 IEEE80211_FCTL_TODS);
3122 /* RA TA DA SA */
3123 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN);
3124 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3125 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3126 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3127 build.hdr_len = 30;
3128 break;
3129 }
3130 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
3131 /* BSSID SA DA */
3132 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN);
3133 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3134 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
3135 build.hdr_len = 24;
3136 break;
3137 case NL80211_IFTYPE_AP_VLAN:
3138 if (sdata->wdev.use_4addr) {
3139 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
3140 IEEE80211_FCTL_TODS);
3141 /* RA TA DA SA */
3142 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
3143 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3144 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
3145 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
3146 build.hdr_len = 30;
3147 break;
3148 }
3149 fallthrough;
3150 case NL80211_IFTYPE_AP:
3151 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
3152 /* DA BSSID SA */
3153 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
3154 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) {
3155 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
3156 } else {
3157 unsigned int link_id = sta->deflink.link_id;
3158 struct ieee80211_link_data *link;
3159
3160 rcu_read_lock();
3161 link = rcu_dereference(sdata->link[link_id]);
3162 if (WARN_ON(!link)) {
3163 rcu_read_unlock();
3164 goto out;
3165 }
3166 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN);
3167 rcu_read_unlock();
3168 }
3169 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
3170 build.hdr_len = 24;
3171 break;
3172 default:
3173 /* not handled on fast-xmit */
3174 goto out;
3175 }
3176
3177 if (sta->sta.wme) {
3178 build.hdr_len += 2;
3179 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
3180 }
3181
3182 /* We store the key here so there's no point in using rcu_dereference()
3183 * but that's fine because the code that changes the pointers will call
3184 * this function after doing so. For a single CPU that would be enough,
3185 * for multiple see the comment above.
3186 */
3187 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
3188 if (!build.key)
3189 build.key = rcu_access_pointer(sdata->default_unicast_key);
3190 if (build.key) {
3191 bool gen_iv, iv_spc, mmic;
3192
3193 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
3194 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
3195 mmic = build.key->conf.flags &
3196 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
3197 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
3198
3199 /* don't handle software crypto */
3200 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
3201 goto out;
3202
3203 /* Key is being removed */
3204 if (build.key->flags & KEY_FLAG_TAINTED)
3205 goto out;
3206
3207 switch (build.key->conf.cipher) {
3208 case WLAN_CIPHER_SUITE_CCMP:
3209 case WLAN_CIPHER_SUITE_CCMP_256:
3210 if (gen_iv)
3211 build.pn_offs = build.hdr_len;
3212 if (gen_iv || iv_spc)
3213 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
3214 break;
3215 case WLAN_CIPHER_SUITE_GCMP:
3216 case WLAN_CIPHER_SUITE_GCMP_256:
3217 if (gen_iv)
3218 build.pn_offs = build.hdr_len;
3219 if (gen_iv || iv_spc)
3220 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3221 break;
3222 case WLAN_CIPHER_SUITE_TKIP:
3223 /* cannot handle MMIC or IV generation in xmit-fast */
3224 if (mmic || gen_iv)
3225 goto out;
3226 if (iv_spc)
3227 build.hdr_len += IEEE80211_TKIP_IV_LEN;
3228 break;
3229 case WLAN_CIPHER_SUITE_WEP40:
3230 case WLAN_CIPHER_SUITE_WEP104:
3231 /* cannot handle IV generation in fast-xmit */
3232 if (gen_iv)
3233 goto out;
3234 if (iv_spc)
3235 build.hdr_len += IEEE80211_WEP_IV_LEN;
3236 break;
3237 case WLAN_CIPHER_SUITE_AES_CMAC:
3238 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3239 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3240 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3241 WARN(1,
3242 "management cipher suite 0x%x enabled for data\n",
3243 build.key->conf.cipher);
3244 goto out;
3245 default:
3246 /* we don't know how to generate IVs for this at all */
3247 if (WARN_ON(gen_iv))
3248 goto out;
3249 }
3250
3251 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3252 }
3253
3254 hdr->frame_control = fc;
3255
3256 memcpy(build.hdr + build.hdr_len,
3257 rfc1042_header, sizeof(rfc1042_header));
3258 build.hdr_len += sizeof(rfc1042_header);
3259
3260 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3261 /* if the kmemdup fails, continue w/o fast_tx */
3262
3263 out:
3264 /* we might have raced against another call to this function */
3265 old = rcu_dereference_protected(sta->fast_tx,
3266 lockdep_is_held(&sta->lock));
3267 rcu_assign_pointer(sta->fast_tx, fast_tx);
3268 if (old)
3269 kfree_rcu(old, rcu_head);
3270 spin_unlock_bh(&sta->lock);
3271 }
3272
ieee80211_check_fast_xmit_all(struct ieee80211_local * local)3273 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3274 {
3275 struct sta_info *sta;
3276
3277 rcu_read_lock();
3278 list_for_each_entry_rcu(sta, &local->sta_list, list)
3279 ieee80211_check_fast_xmit(sta);
3280 rcu_read_unlock();
3281 }
3282
ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data * sdata)3283 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3284 {
3285 struct ieee80211_local *local = sdata->local;
3286 struct sta_info *sta;
3287
3288 rcu_read_lock();
3289
3290 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3291 if (sdata != sta->sdata &&
3292 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3293 continue;
3294 ieee80211_check_fast_xmit(sta);
3295 }
3296
3297 rcu_read_unlock();
3298 }
3299
ieee80211_clear_fast_xmit(struct sta_info * sta)3300 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3301 {
3302 struct ieee80211_fast_tx *fast_tx;
3303
3304 spin_lock_bh(&sta->lock);
3305 fast_tx = rcu_dereference_protected(sta->fast_tx,
3306 lockdep_is_held(&sta->lock));
3307 RCU_INIT_POINTER(sta->fast_tx, NULL);
3308 spin_unlock_bh(&sta->lock);
3309
3310 if (fast_tx)
3311 kfree_rcu(fast_tx, rcu_head);
3312 }
3313
ieee80211_amsdu_realloc_pad(struct ieee80211_local * local,struct sk_buff * skb,int headroom)3314 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3315 struct sk_buff *skb, int headroom)
3316 {
3317 if (skb_headroom(skb) < headroom) {
3318 I802_DEBUG_INC(local->tx_expand_skb_head);
3319
3320 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3321 wiphy_debug(local->hw.wiphy,
3322 "failed to reallocate TX buffer\n");
3323 return false;
3324 }
3325 }
3326
3327 return true;
3328 }
3329
ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data * sdata,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3330 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3331 struct ieee80211_fast_tx *fast_tx,
3332 struct sk_buff *skb)
3333 {
3334 struct ieee80211_local *local = sdata->local;
3335 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3336 struct ieee80211_hdr *hdr;
3337 struct ethhdr *amsdu_hdr;
3338 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3339 int subframe_len = skb->len - hdr_len;
3340 void *data;
3341 u8 *qc, *h_80211_src, *h_80211_dst;
3342 const u8 *bssid;
3343
3344 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3345 return false;
3346
3347 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3348 return true;
3349
3350 if (!ieee80211_amsdu_realloc_pad(local, skb,
3351 sizeof(*amsdu_hdr) +
3352 local->hw.extra_tx_headroom))
3353 return false;
3354
3355 data = skb_push(skb, sizeof(*amsdu_hdr));
3356 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3357 hdr = data;
3358 amsdu_hdr = data + hdr_len;
3359 /* h_80211_src/dst is addr* field within hdr */
3360 h_80211_src = data + fast_tx->sa_offs;
3361 h_80211_dst = data + fast_tx->da_offs;
3362
3363 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3364 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3365 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3366
3367 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3368 * fields needs to be changed to BSSID for A-MSDU frames depending
3369 * on FromDS/ToDS values.
3370 */
3371 switch (sdata->vif.type) {
3372 case NL80211_IFTYPE_STATION:
3373 bssid = sdata->vif.cfg.ap_addr;
3374 break;
3375 case NL80211_IFTYPE_AP:
3376 case NL80211_IFTYPE_AP_VLAN:
3377 bssid = sdata->vif.addr;
3378 break;
3379 default:
3380 bssid = NULL;
3381 }
3382
3383 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3384 ether_addr_copy(h_80211_src, bssid);
3385
3386 if (bssid && ieee80211_has_tods(hdr->frame_control))
3387 ether_addr_copy(h_80211_dst, bssid);
3388
3389 qc = ieee80211_get_qos_ctl(hdr);
3390 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3391
3392 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3393
3394 return true;
3395 }
3396
ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb,const u8 * da,const u8 * sa)3397 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3398 struct sta_info *sta,
3399 struct ieee80211_fast_tx *fast_tx,
3400 struct sk_buff *skb,
3401 const u8 *da, const u8 *sa)
3402 {
3403 struct ieee80211_local *local = sdata->local;
3404 struct fq *fq = &local->fq;
3405 struct fq_tin *tin;
3406 struct fq_flow *flow;
3407 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3408 struct ieee80211_txq *txq = sta->sta.txq[tid];
3409 struct txq_info *txqi;
3410 struct sk_buff **frag_tail, *head;
3411 int subframe_len = skb->len - ETH_ALEN;
3412 u8 max_subframes = sta->sta.max_amsdu_subframes;
3413 int max_frags = local->hw.max_tx_fragments;
3414 int max_amsdu_len = sta->sta.cur->max_amsdu_len;
3415 int orig_truesize;
3416 u32 flow_idx;
3417 __be16 len;
3418 void *data;
3419 bool ret = false;
3420 unsigned int orig_len;
3421 int n = 2, nfrags, pad = 0;
3422 u16 hdrlen;
3423
3424 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3425 return false;
3426
3427 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED)
3428 return false;
3429
3430 if (ieee80211_vif_is_mesh(&sdata->vif))
3431 return false;
3432
3433 if (skb_is_gso(skb))
3434 return false;
3435
3436 if (!txq)
3437 return false;
3438
3439 txqi = to_txq_info(txq);
3440 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3441 return false;
3442
3443 if (sta->sta.cur->max_rc_amsdu_len)
3444 max_amsdu_len = min_t(int, max_amsdu_len,
3445 sta->sta.cur->max_rc_amsdu_len);
3446
3447 if (sta->sta.cur->max_tid_amsdu_len[tid])
3448 max_amsdu_len = min_t(int, max_amsdu_len,
3449 sta->sta.cur->max_tid_amsdu_len[tid]);
3450
3451 flow_idx = fq_flow_idx(fq, skb);
3452
3453 spin_lock_bh(&fq->lock);
3454
3455 /* TODO: Ideally aggregation should be done on dequeue to remain
3456 * responsive to environment changes.
3457 */
3458
3459 tin = &txqi->tin;
3460 flow = fq_flow_classify(fq, tin, flow_idx, skb);
3461 head = skb_peek_tail(&flow->queue);
3462 if (!head || skb_is_gso(head))
3463 goto out;
3464
3465 orig_truesize = head->truesize;
3466 orig_len = head->len;
3467
3468 if (skb->len + head->len > max_amsdu_len)
3469 goto out;
3470
3471 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3472 nfrags += 1 + skb_shinfo(head)->nr_frags;
3473 frag_tail = &skb_shinfo(head)->frag_list;
3474 while (*frag_tail) {
3475 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3476 frag_tail = &(*frag_tail)->next;
3477 n++;
3478 }
3479
3480 if (max_subframes && n > max_subframes)
3481 goto out;
3482
3483 if (max_frags && nfrags > max_frags)
3484 goto out;
3485
3486 if (!drv_can_aggregate_in_amsdu(local, head, skb))
3487 goto out;
3488
3489 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3490 goto out;
3491
3492 /* If n == 2, the "while (*frag_tail)" loop above didn't execute
3493 * and frag_tail should be &skb_shinfo(head)->frag_list.
3494 * However, ieee80211_amsdu_prepare_head() can reallocate it.
3495 * Reload frag_tail to have it pointing to the correct place.
3496 */
3497 if (n == 2)
3498 frag_tail = &skb_shinfo(head)->frag_list;
3499
3500 /*
3501 * Pad out the previous subframe to a multiple of 4 by adding the
3502 * padding to the next one, that's being added. Note that head->len
3503 * is the length of the full A-MSDU, but that works since each time
3504 * we add a new subframe we pad out the previous one to a multiple
3505 * of 4 and thus it no longer matters in the next round.
3506 */
3507 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3508 if ((head->len - hdrlen) & 3)
3509 pad = 4 - ((head->len - hdrlen) & 3);
3510
3511 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3512 2 + pad))
3513 goto out_recalc;
3514
3515 ret = true;
3516 data = skb_push(skb, ETH_ALEN + 2);
3517 ether_addr_copy(data, da);
3518 ether_addr_copy(data + ETH_ALEN, sa);
3519
3520 data += 2 * ETH_ALEN;
3521 len = cpu_to_be16(subframe_len);
3522 memcpy(data, &len, 2);
3523 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3524
3525 memset(skb_push(skb, pad), 0, pad);
3526
3527 head->len += skb->len;
3528 head->data_len += skb->len;
3529 *frag_tail = skb;
3530
3531 out_recalc:
3532 fq->memory_usage += head->truesize - orig_truesize;
3533 if (head->len != orig_len) {
3534 flow->backlog += head->len - orig_len;
3535 tin->backlog_bytes += head->len - orig_len;
3536 }
3537 out:
3538 spin_unlock_bh(&fq->lock);
3539
3540 return ret;
3541 }
3542
3543 /*
3544 * Can be called while the sta lock is held. Anything that can cause packets to
3545 * be generated will cause deadlock!
3546 */
3547 static ieee80211_tx_result
ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,u8 pn_offs,struct ieee80211_key * key,struct ieee80211_tx_data * tx)3548 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3549 struct sta_info *sta, u8 pn_offs,
3550 struct ieee80211_key *key,
3551 struct ieee80211_tx_data *tx)
3552 {
3553 struct sk_buff *skb = tx->skb;
3554 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3555 struct ieee80211_hdr *hdr = (void *)skb->data;
3556 u8 tid = IEEE80211_NUM_TIDS;
3557
3558 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) &&
3559 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE)
3560 return TX_DROP;
3561
3562 if (key)
3563 info->control.hw_key = &key->conf;
3564
3565 dev_sw_netstats_tx_add(skb->dev, 1, skb->len);
3566
3567 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3568 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3569 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3570 } else {
3571 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3572 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3573 sdata->sequence_number += 0x10;
3574 }
3575
3576 if (skb_shinfo(skb)->gso_size)
3577 sta->deflink.tx_stats.msdu[tid] +=
3578 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3579 else
3580 sta->deflink.tx_stats.msdu[tid]++;
3581
3582 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3583
3584 /* statistics normally done by ieee80211_tx_h_stats (but that
3585 * has to consider fragmentation, so is more complex)
3586 */
3587 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3588 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++;
3589
3590 if (pn_offs) {
3591 u64 pn;
3592 u8 *crypto_hdr = skb->data + pn_offs;
3593
3594 switch (key->conf.cipher) {
3595 case WLAN_CIPHER_SUITE_CCMP:
3596 case WLAN_CIPHER_SUITE_CCMP_256:
3597 case WLAN_CIPHER_SUITE_GCMP:
3598 case WLAN_CIPHER_SUITE_GCMP_256:
3599 pn = atomic64_inc_return(&key->conf.tx_pn);
3600 crypto_hdr[0] = pn;
3601 crypto_hdr[1] = pn >> 8;
3602 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6);
3603 crypto_hdr[4] = pn >> 16;
3604 crypto_hdr[5] = pn >> 24;
3605 crypto_hdr[6] = pn >> 32;
3606 crypto_hdr[7] = pn >> 40;
3607 break;
3608 }
3609 }
3610
3611 return TX_CONTINUE;
3612 }
3613
3614 static netdev_features_t
ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data * sdata)3615 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata)
3616 {
3617 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
3618 return sdata->vif.netdev_features;
3619
3620 if (!sdata->bss)
3621 return 0;
3622
3623 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
3624 return sdata->vif.netdev_features;
3625 }
3626
3627 static struct sk_buff *
ieee80211_tx_skb_fixup(struct sk_buff * skb,netdev_features_t features)3628 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features)
3629 {
3630 if (skb_is_gso(skb)) {
3631 struct sk_buff *segs;
3632
3633 segs = skb_gso_segment(skb, features);
3634 if (!segs)
3635 return skb;
3636 if (IS_ERR(segs))
3637 goto free;
3638
3639 consume_skb(skb);
3640 return segs;
3641 }
3642
3643 if (skb_needs_linearize(skb, features) && __skb_linearize(skb))
3644 goto free;
3645
3646 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3647 int ofs = skb_checksum_start_offset(skb);
3648
3649 if (skb->encapsulation)
3650 skb_set_inner_transport_header(skb, ofs);
3651 else
3652 skb_set_transport_header(skb, ofs);
3653
3654 if (skb_csum_hwoffload_help(skb, features))
3655 goto free;
3656 }
3657
3658 skb_mark_not_on_list(skb);
3659 return skb;
3660
3661 free:
3662 kfree_skb(skb);
3663 return NULL;
3664 }
3665
__ieee80211_xmit_fast(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb,bool ampdu,const u8 * da,const u8 * sa)3666 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3667 struct sta_info *sta,
3668 struct ieee80211_fast_tx *fast_tx,
3669 struct sk_buff *skb, bool ampdu,
3670 const u8 *da, const u8 *sa)
3671 {
3672 struct ieee80211_local *local = sdata->local;
3673 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3674 struct ieee80211_tx_info *info;
3675 struct ieee80211_tx_data tx;
3676 ieee80211_tx_result r;
3677 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3678 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3679
3680 skb = skb_share_check(skb, GFP_ATOMIC);
3681 if (unlikely(!skb))
3682 return;
3683
3684 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3685 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa))
3686 return;
3687
3688 /* will not be crypto-handled beyond what we do here, so use false
3689 * as the may-encrypt argument for the resize to not account for
3690 * more room than we already have in 'extra_head'
3691 */
3692 if (unlikely(ieee80211_skb_resize(sdata, skb,
3693 max_t(int, extra_head + hw_headroom -
3694 skb_headroom(skb), 0),
3695 ENCRYPT_NO)))
3696 goto free;
3697
3698 hdr = skb_push(skb, extra_head);
3699 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3700 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN);
3701 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN);
3702
3703 info = IEEE80211_SKB_CB(skb);
3704 memset(info, 0, sizeof(*info));
3705 info->band = fast_tx->band;
3706 info->control.vif = &sdata->vif;
3707 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3708 IEEE80211_TX_CTL_DONTFRAG;
3709 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT |
3710 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED,
3711 IEEE80211_TX_CTRL_MLO_LINK);
3712
3713 #ifdef CONFIG_MAC80211_DEBUGFS
3714 if (local->force_tx_status)
3715 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
3716 #endif
3717
3718 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3719 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3720
3721 *ieee80211_get_qos_ctl(hdr) = tid;
3722 }
3723
3724 __skb_queue_head_init(&tx.skbs);
3725
3726 tx.flags = IEEE80211_TX_UNICAST;
3727 tx.local = local;
3728 tx.sdata = sdata;
3729 tx.sta = sta;
3730 tx.key = fast_tx->key;
3731
3732 if (ieee80211_queue_skb(local, sdata, sta, skb))
3733 return;
3734
3735 tx.skb = skb;
3736 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3737 fast_tx->key, &tx);
3738 tx.skb = NULL;
3739 if (r == TX_DROP)
3740 goto free;
3741
3742 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3743 sdata = container_of(sdata->bss,
3744 struct ieee80211_sub_if_data, u.ap);
3745
3746 __skb_queue_tail(&tx.skbs, skb);
3747 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false);
3748 return;
3749
3750 free:
3751 kfree_skb(skb);
3752 }
3753
ieee80211_xmit_fast(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,struct ieee80211_fast_tx * fast_tx,struct sk_buff * skb)3754 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3755 struct sta_info *sta,
3756 struct ieee80211_fast_tx *fast_tx,
3757 struct sk_buff *skb)
3758 {
3759 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3760 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3761 struct tid_ampdu_tx *tid_tx = NULL;
3762 struct sk_buff *next;
3763 struct ethhdr eth;
3764 u8 tid = IEEE80211_NUM_TIDS;
3765
3766 /* control port protocol needs a lot of special handling */
3767 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3768 return false;
3769
3770 /* only RFC 1042 SNAP */
3771 if (ethertype < ETH_P_802_3_MIN)
3772 return false;
3773
3774 /* don't handle TX status request here either */
3775 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3776 return false;
3777
3778 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3779 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3780 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3781 if (tid_tx) {
3782 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3783 return false;
3784 if (tid_tx->timeout)
3785 tid_tx->last_tx = jiffies;
3786 }
3787 }
3788
3789 memcpy(ð, skb->data, ETH_HLEN - 2);
3790
3791 /* after this point (skb is modified) we cannot return false */
3792 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata));
3793 if (!skb)
3794 return true;
3795
3796 skb_list_walk_safe(skb, skb, next) {
3797 skb_mark_not_on_list(skb);
3798 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx,
3799 eth.h_dest, eth.h_source);
3800 }
3801
3802 return true;
3803 }
3804
ieee80211_tx_dequeue(struct ieee80211_hw * hw,struct ieee80211_txq * txq)3805 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3806 struct ieee80211_txq *txq)
3807 {
3808 struct ieee80211_local *local = hw_to_local(hw);
3809 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3810 struct ieee80211_hdr *hdr;
3811 struct sk_buff *skb = NULL;
3812 struct fq *fq = &local->fq;
3813 struct fq_tin *tin = &txqi->tin;
3814 struct ieee80211_tx_info *info;
3815 struct ieee80211_tx_data tx;
3816 ieee80211_tx_result r;
3817 struct ieee80211_vif *vif = txq->vif;
3818 int q = vif->hw_queue[txq->ac];
3819 unsigned long flags;
3820 bool q_stopped;
3821
3822 WARN_ON_ONCE(softirq_count() == 0);
3823
3824 if (!ieee80211_txq_airtime_check(hw, txq))
3825 return NULL;
3826
3827 begin:
3828 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3829 q_stopped = local->queue_stop_reasons[q];
3830 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3831
3832 if (unlikely(q_stopped)) {
3833 /* mark for waking later */
3834 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags);
3835 return NULL;
3836 }
3837
3838 spin_lock_bh(&fq->lock);
3839
3840 /* Make sure fragments stay together. */
3841 skb = __skb_dequeue(&txqi->frags);
3842 if (unlikely(skb)) {
3843 if (!(IEEE80211_SKB_CB(skb)->control.flags &
3844 IEEE80211_TX_INTCFL_NEED_TXPROCESSING))
3845 goto out;
3846 IEEE80211_SKB_CB(skb)->control.flags &=
3847 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
3848 } else {
3849 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags)))
3850 goto out;
3851
3852 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3853 }
3854
3855 if (!skb)
3856 goto out;
3857
3858 spin_unlock_bh(&fq->lock);
3859
3860 hdr = (struct ieee80211_hdr *)skb->data;
3861 info = IEEE80211_SKB_CB(skb);
3862
3863 memset(&tx, 0, sizeof(tx));
3864 __skb_queue_head_init(&tx.skbs);
3865 tx.local = local;
3866 tx.skb = skb;
3867 tx.sdata = vif_to_sdata(info->control.vif);
3868
3869 if (txq->sta) {
3870 tx.sta = container_of(txq->sta, struct sta_info, sta);
3871 /*
3872 * Drop unicast frames to unauthorised stations unless they are
3873 * injected frames or EAPOL frames from the local station.
3874 */
3875 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
3876 ieee80211_is_data(hdr->frame_control) &&
3877 !ieee80211_vif_is_mesh(&tx.sdata->vif) &&
3878 tx.sdata->vif.type != NL80211_IFTYPE_OCB &&
3879 !is_multicast_ether_addr(hdr->addr1) &&
3880 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) &&
3881 (!(info->control.flags &
3882 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) ||
3883 !ieee80211_is_our_addr(tx.sdata, hdr->addr2,
3884 NULL)))) {
3885 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
3886 ieee80211_free_txskb(&local->hw, skb);
3887 goto begin;
3888 }
3889 }
3890
3891 /*
3892 * The key can be removed while the packet was queued, so need to call
3893 * this here to get the current key.
3894 */
3895 r = ieee80211_tx_h_select_key(&tx);
3896 if (r != TX_CONTINUE) {
3897 ieee80211_free_txskb(&local->hw, skb);
3898 goto begin;
3899 }
3900
3901 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3902 info->flags |= (IEEE80211_TX_CTL_AMPDU |
3903 IEEE80211_TX_CTL_DONTFRAG);
3904
3905 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
3906 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3907 r = ieee80211_tx_h_rate_ctrl(&tx);
3908 if (r != TX_CONTINUE) {
3909 ieee80211_free_txskb(&local->hw, skb);
3910 goto begin;
3911 }
3912 }
3913 goto encap_out;
3914 }
3915
3916 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3917 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3918 sta);
3919 u8 pn_offs = 0;
3920
3921 if (tx.key &&
3922 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3923 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3924
3925 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3926 tx.key, &tx);
3927 if (r != TX_CONTINUE) {
3928 ieee80211_free_txskb(&local->hw, skb);
3929 goto begin;
3930 }
3931 } else {
3932 if (invoke_tx_handlers_late(&tx))
3933 goto begin;
3934
3935 skb = __skb_dequeue(&tx.skbs);
3936 info = IEEE80211_SKB_CB(skb);
3937
3938 if (!skb_queue_empty(&tx.skbs)) {
3939 spin_lock_bh(&fq->lock);
3940 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3941 spin_unlock_bh(&fq->lock);
3942 }
3943 }
3944
3945 if (skb_has_frag_list(skb) &&
3946 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3947 if (skb_linearize(skb)) {
3948 ieee80211_free_txskb(&local->hw, skb);
3949 goto begin;
3950 }
3951 }
3952
3953 switch (tx.sdata->vif.type) {
3954 case NL80211_IFTYPE_MONITOR:
3955 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3956 vif = &tx.sdata->vif;
3957 break;
3958 }
3959 tx.sdata = rcu_dereference(local->monitor_sdata);
3960 if (tx.sdata &&
3961 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) {
3962 vif = &tx.sdata->vif;
3963 info->hw_queue =
3964 vif->hw_queue[skb_get_queue_mapping(skb)];
3965 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3966 ieee80211_free_txskb(&local->hw, skb);
3967 goto begin;
3968 } else {
3969 info->control.vif = NULL;
3970 return skb;
3971 }
3972 break;
3973 case NL80211_IFTYPE_AP_VLAN:
3974 tx.sdata = container_of(tx.sdata->bss,
3975 struct ieee80211_sub_if_data, u.ap);
3976 fallthrough;
3977 default:
3978 vif = &tx.sdata->vif;
3979 break;
3980 }
3981
3982 encap_out:
3983 info->control.vif = vif;
3984
3985 if (tx.sta &&
3986 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) {
3987 bool ampdu = txq->ac != IEEE80211_AC_VO;
3988 u32 airtime;
3989
3990 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta,
3991 skb->len, ampdu);
3992 if (airtime) {
3993 airtime = ieee80211_info_set_tx_time_est(info, airtime);
3994 ieee80211_sta_update_pending_airtime(local, tx.sta,
3995 txq->ac,
3996 airtime,
3997 false);
3998 }
3999 }
4000
4001 return skb;
4002
4003 out:
4004 spin_unlock_bh(&fq->lock);
4005
4006 return skb;
4007 }
4008 EXPORT_SYMBOL(ieee80211_tx_dequeue);
4009
ieee80211_sta_deficit(struct sta_info * sta,u8 ac)4010 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac)
4011 {
4012 struct airtime_info *air_info = &sta->airtime[ac];
4013
4014 return air_info->deficit - atomic_read(&air_info->aql_tx_pending);
4015 }
4016
4017 static void
ieee80211_txq_set_active(struct txq_info * txqi)4018 ieee80211_txq_set_active(struct txq_info *txqi)
4019 {
4020 struct sta_info *sta;
4021
4022 if (!txqi->txq.sta)
4023 return;
4024
4025 sta = container_of(txqi->txq.sta, struct sta_info, sta);
4026 sta->airtime[txqi->txq.ac].last_active = jiffies;
4027 }
4028
4029 static bool
ieee80211_txq_keep_active(struct txq_info * txqi)4030 ieee80211_txq_keep_active(struct txq_info *txqi)
4031 {
4032 struct sta_info *sta;
4033
4034 if (!txqi->txq.sta)
4035 return false;
4036
4037 sta = container_of(txqi->txq.sta, struct sta_info, sta);
4038 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0)
4039 return false;
4040
4041 return ieee80211_sta_keep_active(sta, txqi->txq.ac);
4042 }
4043
ieee80211_next_txq(struct ieee80211_hw * hw,u8 ac)4044 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
4045 {
4046 struct ieee80211_local *local = hw_to_local(hw);
4047 struct ieee80211_txq *ret = NULL;
4048 struct txq_info *txqi = NULL, *head = NULL;
4049 bool found_eligible_txq = false;
4050
4051 spin_lock_bh(&local->active_txq_lock[ac]);
4052
4053 if (!local->schedule_round[ac])
4054 goto out;
4055
4056 begin:
4057 txqi = list_first_entry_or_null(&local->active_txqs[ac],
4058 struct txq_info,
4059 schedule_order);
4060 if (!txqi)
4061 goto out;
4062
4063 if (txqi == head) {
4064 if (!found_eligible_txq)
4065 goto out;
4066 else
4067 found_eligible_txq = false;
4068 }
4069
4070 if (!head)
4071 head = txqi;
4072
4073 if (txqi->txq.sta) {
4074 struct sta_info *sta = container_of(txqi->txq.sta,
4075 struct sta_info, sta);
4076 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq);
4077 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac);
4078
4079 if (aql_check)
4080 found_eligible_txq = true;
4081
4082 if (deficit < 0)
4083 sta->airtime[txqi->txq.ac].deficit +=
4084 sta->airtime_weight;
4085
4086 if (deficit < 0 || !aql_check) {
4087 list_move_tail(&txqi->schedule_order,
4088 &local->active_txqs[txqi->txq.ac]);
4089 goto begin;
4090 }
4091 }
4092
4093 if (txqi->schedule_round == local->schedule_round[ac])
4094 goto out;
4095
4096 list_del_init(&txqi->schedule_order);
4097 txqi->schedule_round = local->schedule_round[ac];
4098 ret = &txqi->txq;
4099
4100 out:
4101 spin_unlock_bh(&local->active_txq_lock[ac]);
4102 return ret;
4103 }
4104 EXPORT_SYMBOL(ieee80211_next_txq);
4105
__ieee80211_schedule_txq(struct ieee80211_hw * hw,struct ieee80211_txq * txq,bool force)4106 void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
4107 struct ieee80211_txq *txq,
4108 bool force)
4109 {
4110 struct ieee80211_local *local = hw_to_local(hw);
4111 struct txq_info *txqi = to_txq_info(txq);
4112 bool has_queue;
4113
4114 spin_lock_bh(&local->active_txq_lock[txq->ac]);
4115
4116 has_queue = force || txq_has_queue(txq);
4117 if (list_empty(&txqi->schedule_order) &&
4118 (has_queue || ieee80211_txq_keep_active(txqi))) {
4119 /* If airtime accounting is active, always enqueue STAs at the
4120 * head of the list to ensure that they only get moved to the
4121 * back by the airtime DRR scheduler once they have a negative
4122 * deficit. A station that already has a negative deficit will
4123 * get immediately moved to the back of the list on the next
4124 * call to ieee80211_next_txq().
4125 */
4126 if (txqi->txq.sta && local->airtime_flags && has_queue &&
4127 wiphy_ext_feature_isset(local->hw.wiphy,
4128 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
4129 list_add(&txqi->schedule_order,
4130 &local->active_txqs[txq->ac]);
4131 else
4132 list_add_tail(&txqi->schedule_order,
4133 &local->active_txqs[txq->ac]);
4134 if (has_queue)
4135 ieee80211_txq_set_active(txqi);
4136 }
4137
4138 spin_unlock_bh(&local->active_txq_lock[txq->ac]);
4139 }
4140 EXPORT_SYMBOL(__ieee80211_schedule_txq);
4141
4142 DEFINE_STATIC_KEY_FALSE(aql_disable);
4143
ieee80211_txq_airtime_check(struct ieee80211_hw * hw,struct ieee80211_txq * txq)4144 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw,
4145 struct ieee80211_txq *txq)
4146 {
4147 struct sta_info *sta;
4148 struct ieee80211_local *local = hw_to_local(hw);
4149
4150 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
4151 return true;
4152
4153 if (static_branch_unlikely(&aql_disable))
4154 return true;
4155
4156 if (!txq->sta)
4157 return true;
4158
4159 if (unlikely(txq->tid == IEEE80211_NUM_TIDS))
4160 return true;
4161
4162 sta = container_of(txq->sta, struct sta_info, sta);
4163 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
4164 sta->airtime[txq->ac].aql_limit_low)
4165 return true;
4166
4167 if (atomic_read(&local->aql_total_pending_airtime) <
4168 local->aql_threshold &&
4169 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
4170 sta->airtime[txq->ac].aql_limit_high)
4171 return true;
4172
4173 return false;
4174 }
4175 EXPORT_SYMBOL(ieee80211_txq_airtime_check);
4176
4177 static bool
ieee80211_txq_schedule_airtime_check(struct ieee80211_local * local,u8 ac)4178 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac)
4179 {
4180 unsigned int num_txq = 0;
4181 struct txq_info *txq;
4182 u32 aql_limit;
4183
4184 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
4185 return true;
4186
4187 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order)
4188 num_txq++;
4189
4190 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 +
4191 local->aql_txq_limit_high[ac];
4192
4193 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit;
4194 }
4195
ieee80211_txq_may_transmit(struct ieee80211_hw * hw,struct ieee80211_txq * txq)4196 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw,
4197 struct ieee80211_txq *txq)
4198 {
4199 struct ieee80211_local *local = hw_to_local(hw);
4200 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq);
4201 struct sta_info *sta;
4202 u8 ac = txq->ac;
4203
4204 spin_lock_bh(&local->active_txq_lock[ac]);
4205
4206 if (!txqi->txq.sta)
4207 goto out;
4208
4209 if (list_empty(&txqi->schedule_order))
4210 goto out;
4211
4212 if (!ieee80211_txq_schedule_airtime_check(local, ac))
4213 goto out;
4214
4215 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac],
4216 schedule_order) {
4217 if (iter == txqi)
4218 break;
4219
4220 if (!iter->txq.sta) {
4221 list_move_tail(&iter->schedule_order,
4222 &local->active_txqs[ac]);
4223 continue;
4224 }
4225 sta = container_of(iter->txq.sta, struct sta_info, sta);
4226 if (ieee80211_sta_deficit(sta, ac) < 0)
4227 sta->airtime[ac].deficit += sta->airtime_weight;
4228 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]);
4229 }
4230
4231 sta = container_of(txqi->txq.sta, struct sta_info, sta);
4232 if (sta->airtime[ac].deficit >= 0)
4233 goto out;
4234
4235 sta->airtime[ac].deficit += sta->airtime_weight;
4236 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]);
4237 spin_unlock_bh(&local->active_txq_lock[ac]);
4238
4239 return false;
4240 out:
4241 if (!list_empty(&txqi->schedule_order))
4242 list_del_init(&txqi->schedule_order);
4243 spin_unlock_bh(&local->active_txq_lock[ac]);
4244
4245 return true;
4246 }
4247 EXPORT_SYMBOL(ieee80211_txq_may_transmit);
4248
ieee80211_txq_schedule_start(struct ieee80211_hw * hw,u8 ac)4249 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac)
4250 {
4251 struct ieee80211_local *local = hw_to_local(hw);
4252
4253 spin_lock_bh(&local->active_txq_lock[ac]);
4254
4255 if (ieee80211_txq_schedule_airtime_check(local, ac)) {
4256 local->schedule_round[ac]++;
4257 if (!local->schedule_round[ac])
4258 local->schedule_round[ac]++;
4259 } else {
4260 local->schedule_round[ac] = 0;
4261 }
4262
4263 spin_unlock_bh(&local->active_txq_lock[ac]);
4264 }
4265 EXPORT_SYMBOL(ieee80211_txq_schedule_start);
4266
__ieee80211_subif_start_xmit(struct sk_buff * skb,struct net_device * dev,u32 info_flags,u32 ctrl_flags,u64 * cookie)4267 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
4268 struct net_device *dev,
4269 u32 info_flags,
4270 u32 ctrl_flags,
4271 u64 *cookie)
4272 {
4273 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4274 struct ieee80211_local *local = sdata->local;
4275 struct sta_info *sta;
4276 struct sk_buff *next;
4277 int len = skb->len;
4278
4279 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) {
4280 kfree_skb(skb);
4281 return;
4282 }
4283
4284 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
4285
4286 rcu_read_lock();
4287
4288 if (ieee80211_vif_is_mesh(&sdata->vif) &&
4289 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) &&
4290 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags))
4291 goto out;
4292
4293 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
4294 goto out_free;
4295
4296 if (IS_ERR(sta))
4297 sta = NULL;
4298
4299 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb));
4300 ieee80211_aggr_check(sdata, sta, skb);
4301
4302 if (sta) {
4303 struct ieee80211_fast_tx *fast_tx;
4304
4305 fast_tx = rcu_dereference(sta->fast_tx);
4306
4307 if (fast_tx &&
4308 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
4309 goto out;
4310 }
4311
4312 /* the frame could be fragmented, software-encrypted, and other
4313 * things so we cannot really handle checksum or GSO offload.
4314 * fix it up in software before we handle anything else.
4315 */
4316 skb = ieee80211_tx_skb_fixup(skb, 0);
4317 if (!skb) {
4318 len = 0;
4319 goto out;
4320 }
4321
4322 skb_list_walk_safe(skb, skb, next) {
4323 skb_mark_not_on_list(skb);
4324
4325 if (skb->protocol == sdata->control_port_protocol)
4326 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
4327
4328 skb = ieee80211_build_hdr(sdata, skb, info_flags,
4329 sta, ctrl_flags, cookie);
4330 if (IS_ERR(skb)) {
4331 kfree_skb_list(next);
4332 goto out;
4333 }
4334
4335 dev_sw_netstats_tx_add(dev, 1, skb->len);
4336
4337 ieee80211_xmit(sdata, sta, skb);
4338 }
4339 goto out;
4340 out_free:
4341 kfree_skb(skb);
4342 len = 0;
4343 out:
4344 if (len)
4345 ieee80211_tpt_led_trig_tx(local, len);
4346 rcu_read_unlock();
4347 }
4348
ieee80211_change_da(struct sk_buff * skb,struct sta_info * sta)4349 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
4350 {
4351 struct ethhdr *eth;
4352 int err;
4353
4354 err = skb_ensure_writable(skb, ETH_HLEN);
4355 if (unlikely(err))
4356 return err;
4357
4358 eth = (void *)skb->data;
4359 ether_addr_copy(eth->h_dest, sta->sta.addr);
4360
4361 return 0;
4362 }
4363
ieee80211_multicast_to_unicast(struct sk_buff * skb,struct net_device * dev)4364 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
4365 struct net_device *dev)
4366 {
4367 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4368 const struct ethhdr *eth = (void *)skb->data;
4369 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
4370 __be16 ethertype;
4371
4372 switch (sdata->vif.type) {
4373 case NL80211_IFTYPE_AP_VLAN:
4374 if (sdata->u.vlan.sta)
4375 return false;
4376 if (sdata->wdev.use_4addr)
4377 return false;
4378 fallthrough;
4379 case NL80211_IFTYPE_AP:
4380 /* check runtime toggle for this bss */
4381 if (!sdata->bss->multicast_to_unicast)
4382 return false;
4383 break;
4384 default:
4385 return false;
4386 }
4387
4388 /* multicast to unicast conversion only for some payload */
4389 ethertype = eth->h_proto;
4390 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
4391 ethertype = ethvlan->h_vlan_encapsulated_proto;
4392 switch (ethertype) {
4393 case htons(ETH_P_ARP):
4394 case htons(ETH_P_IP):
4395 case htons(ETH_P_IPV6):
4396 break;
4397 default:
4398 return false;
4399 }
4400
4401 return true;
4402 }
4403
4404 static void
ieee80211_convert_to_unicast(struct sk_buff * skb,struct net_device * dev,struct sk_buff_head * queue)4405 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
4406 struct sk_buff_head *queue)
4407 {
4408 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4409 struct ieee80211_local *local = sdata->local;
4410 const struct ethhdr *eth = (struct ethhdr *)skb->data;
4411 struct sta_info *sta, *first = NULL;
4412 struct sk_buff *cloned_skb;
4413
4414 rcu_read_lock();
4415
4416 list_for_each_entry_rcu(sta, &local->sta_list, list) {
4417 if (sdata != sta->sdata)
4418 /* AP-VLAN mismatch */
4419 continue;
4420 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
4421 /* do not send back to source */
4422 continue;
4423 if (!first) {
4424 first = sta;
4425 continue;
4426 }
4427 cloned_skb = skb_clone(skb, GFP_ATOMIC);
4428 if (!cloned_skb)
4429 goto multicast;
4430 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
4431 dev_kfree_skb(cloned_skb);
4432 goto multicast;
4433 }
4434 __skb_queue_tail(queue, cloned_skb);
4435 }
4436
4437 if (likely(first)) {
4438 if (unlikely(ieee80211_change_da(skb, first)))
4439 goto multicast;
4440 __skb_queue_tail(queue, skb);
4441 } else {
4442 /* no STA connected, drop */
4443 kfree_skb(skb);
4444 skb = NULL;
4445 }
4446
4447 goto out;
4448 multicast:
4449 __skb_queue_purge(queue);
4450 __skb_queue_tail(queue, skb);
4451 out:
4452 rcu_read_unlock();
4453 }
4454
ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 ctrl_flags,unsigned int link_id)4455 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata,
4456 struct sk_buff *skb, u32 ctrl_flags,
4457 unsigned int link_id)
4458 {
4459 struct sk_buff *out;
4460
4461 out = skb_copy(skb, GFP_ATOMIC);
4462 if (!out)
4463 return;
4464
4465 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK);
4466 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL);
4467 }
4468
ieee80211_mlo_multicast_tx(struct net_device * dev,struct sk_buff * skb)4469 static void ieee80211_mlo_multicast_tx(struct net_device *dev,
4470 struct sk_buff *skb)
4471 {
4472 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4473 unsigned long links = sdata->vif.active_links;
4474 unsigned int link;
4475 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX;
4476
4477 if (hweight16(links) == 1) {
4478 ctrl_flags |= u32_encode_bits(__ffs(links),
4479 IEEE80211_TX_CTRL_MLO_LINK);
4480
4481 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags,
4482 NULL);
4483 return;
4484 }
4485
4486 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) {
4487 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link);
4488 ctrl_flags = 0;
4489 }
4490 kfree_skb(skb);
4491 }
4492
4493 /**
4494 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
4495 * @skb: packet to be sent
4496 * @dev: incoming interface
4497 *
4498 * On failure skb will be freed.
4499 *
4500 * Returns: the netdev TX status (but really only %NETDEV_TX_OK)
4501 */
ieee80211_subif_start_xmit(struct sk_buff * skb,struct net_device * dev)4502 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
4503 struct net_device *dev)
4504 {
4505 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4506 const struct ethhdr *eth = (void *)skb->data;
4507
4508 if (likely(!is_multicast_ether_addr(eth->h_dest)))
4509 goto normal;
4510
4511 if (unlikely(!ieee80211_sdata_running(sdata))) {
4512 kfree_skb(skb);
4513 return NETDEV_TX_OK;
4514 }
4515
4516 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
4517 struct sk_buff_head queue;
4518
4519 __skb_queue_head_init(&queue);
4520 ieee80211_convert_to_unicast(skb, dev, &queue);
4521 while ((skb = __skb_dequeue(&queue)))
4522 __ieee80211_subif_start_xmit(skb, dev, 0,
4523 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4524 NULL);
4525 } else if (ieee80211_vif_is_mld(&sdata->vif) &&
4526 sdata->vif.type == NL80211_IFTYPE_AP &&
4527 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) {
4528 ieee80211_mlo_multicast_tx(dev, skb);
4529 } else {
4530 normal:
4531 __ieee80211_subif_start_xmit(skb, dev, 0,
4532 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4533 NULL);
4534 }
4535
4536 return NETDEV_TX_OK;
4537 }
4538
4539
4540
__ieee80211_tx_8023(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct sta_info * sta,bool txpending)4541 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
4542 struct sk_buff *skb, struct sta_info *sta,
4543 bool txpending)
4544 {
4545 struct ieee80211_local *local = sdata->local;
4546 struct ieee80211_tx_control control = {};
4547 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4548 struct ieee80211_sta *pubsta = NULL;
4549 unsigned long flags;
4550 int q = info->hw_queue;
4551
4552 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4553
4554 if (local->queue_stop_reasons[q] ||
4555 (!txpending && !skb_queue_empty(&local->pending[q]))) {
4556 if (txpending)
4557 skb_queue_head(&local->pending[q], skb);
4558 else
4559 skb_queue_tail(&local->pending[q], skb);
4560
4561 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4562
4563 return false;
4564 }
4565
4566 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4567
4568 if (sta && sta->uploaded)
4569 pubsta = &sta->sta;
4570
4571 control.sta = pubsta;
4572
4573 drv_tx(local, &control, skb);
4574
4575 return true;
4576 }
4577
ieee80211_tx_8023(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,struct sta_info * sta,bool txpending)4578 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
4579 struct sk_buff *skb, struct sta_info *sta,
4580 bool txpending)
4581 {
4582 struct ieee80211_local *local = sdata->local;
4583 struct sk_buff *next;
4584 bool ret = true;
4585
4586 if (ieee80211_queue_skb(local, sdata, sta, skb))
4587 return true;
4588
4589 skb_list_walk_safe(skb, skb, next) {
4590 skb_mark_not_on_list(skb);
4591 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending))
4592 ret = false;
4593 }
4594
4595 return ret;
4596 }
4597
ieee80211_8023_xmit(struct ieee80211_sub_if_data * sdata,struct net_device * dev,struct sta_info * sta,struct ieee80211_key * key,struct sk_buff * skb)4598 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
4599 struct net_device *dev, struct sta_info *sta,
4600 struct ieee80211_key *key, struct sk_buff *skb)
4601 {
4602 struct ieee80211_tx_info *info;
4603 struct ieee80211_local *local = sdata->local;
4604 struct tid_ampdu_tx *tid_tx;
4605 struct sk_buff *seg, *next;
4606 unsigned int skbs = 0, len = 0;
4607 u16 queue;
4608 u8 tid;
4609
4610 queue = ieee80211_select_queue(sdata, sta, skb);
4611 skb_set_queue_mapping(skb, queue);
4612
4613 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) &&
4614 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
4615 goto out_free;
4616
4617 skb = skb_share_check(skb, GFP_ATOMIC);
4618 if (unlikely(!skb))
4619 return;
4620
4621 ieee80211_aggr_check(sdata, sta, skb);
4622
4623 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
4624 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
4625 if (tid_tx) {
4626 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
4627 /* fall back to non-offload slow path */
4628 __ieee80211_subif_start_xmit(skb, dev, 0,
4629 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
4630 NULL);
4631 return;
4632 }
4633
4634 if (tid_tx->timeout)
4635 tid_tx->last_tx = jiffies;
4636 }
4637
4638 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata));
4639 if (!skb)
4640 return;
4641
4642 info = IEEE80211_SKB_CB(skb);
4643 memset(info, 0, sizeof(*info));
4644
4645 info->hw_queue = sdata->vif.hw_queue[queue];
4646
4647 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4648 sdata = container_of(sdata->bss,
4649 struct ieee80211_sub_if_data, u.ap);
4650
4651 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP;
4652 info->control.vif = &sdata->vif;
4653
4654 if (key)
4655 info->control.hw_key = &key->conf;
4656
4657 skb_list_walk_safe(skb, seg, next) {
4658 skbs++;
4659 len += seg->len;
4660 if (seg != skb)
4661 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info));
4662 }
4663
4664 if (unlikely(skb->sk &&
4665 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
4666 info->status_data = ieee80211_store_ack_skb(local, skb,
4667 &info->flags, NULL);
4668 if (info->status_data)
4669 info->status_data_idr = 1;
4670 }
4671
4672 dev_sw_netstats_tx_add(dev, skbs, len);
4673 sta->deflink.tx_stats.packets[queue] += skbs;
4674 sta->deflink.tx_stats.bytes[queue] += len;
4675
4676 ieee80211_tpt_led_trig_tx(local, len);
4677
4678 ieee80211_tx_8023(sdata, skb, sta, false);
4679
4680 return;
4681
4682 out_free:
4683 kfree_skb(skb);
4684 }
4685
ieee80211_subif_start_xmit_8023(struct sk_buff * skb,struct net_device * dev)4686 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
4687 struct net_device *dev)
4688 {
4689 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4690 struct ethhdr *ehdr = (struct ethhdr *)skb->data;
4691 struct ieee80211_key *key;
4692 struct sta_info *sta;
4693
4694 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) {
4695 kfree_skb(skb);
4696 return NETDEV_TX_OK;
4697 }
4698
4699 rcu_read_lock();
4700
4701 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4702 kfree_skb(skb);
4703 goto out;
4704 }
4705
4706 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded ||
4707 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
4708 sdata->control_port_protocol == ehdr->h_proto))
4709 goto skip_offload;
4710
4711 key = rcu_dereference(sta->ptk[sta->ptk_idx]);
4712 if (!key)
4713 key = rcu_dereference(sdata->default_unicast_key);
4714
4715 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) ||
4716 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP))
4717 goto skip_offload;
4718
4719 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
4720 ieee80211_8023_xmit(sdata, dev, sta, key, skb);
4721 goto out;
4722
4723 skip_offload:
4724 ieee80211_subif_start_xmit(skb, dev);
4725 out:
4726 rcu_read_unlock();
4727
4728 return NETDEV_TX_OK;
4729 }
4730
4731 struct sk_buff *
ieee80211_build_data_template(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,u32 info_flags)4732 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
4733 struct sk_buff *skb, u32 info_flags)
4734 {
4735 struct ieee80211_hdr *hdr;
4736 struct ieee80211_tx_data tx = {
4737 .local = sdata->local,
4738 .sdata = sdata,
4739 };
4740 struct sta_info *sta;
4741
4742 rcu_read_lock();
4743
4744 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4745 kfree_skb(skb);
4746 skb = ERR_PTR(-EINVAL);
4747 goto out;
4748 }
4749
4750 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta,
4751 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
4752 if (IS_ERR(skb))
4753 goto out;
4754
4755 hdr = (void *)skb->data;
4756 tx.sta = sta_info_get(sdata, hdr->addr1);
4757 tx.skb = skb;
4758
4759 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
4760 rcu_read_unlock();
4761 kfree_skb(skb);
4762 return ERR_PTR(-EINVAL);
4763 }
4764
4765 out:
4766 rcu_read_unlock();
4767 return skb;
4768 }
4769
4770 /*
4771 * ieee80211_clear_tx_pending may not be called in a context where
4772 * it is possible that it packets could come in again.
4773 */
ieee80211_clear_tx_pending(struct ieee80211_local * local)4774 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
4775 {
4776 struct sk_buff *skb;
4777 int i;
4778
4779 for (i = 0; i < local->hw.queues; i++) {
4780 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
4781 ieee80211_free_txskb(&local->hw, skb);
4782 }
4783 }
4784
4785 /*
4786 * Returns false if the frame couldn't be transmitted but was queued instead,
4787 * which in this case means re-queued -- take as an indication to stop sending
4788 * more pending frames.
4789 */
ieee80211_tx_pending_skb(struct ieee80211_local * local,struct sk_buff * skb)4790 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
4791 struct sk_buff *skb)
4792 {
4793 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4794 struct ieee80211_sub_if_data *sdata;
4795 struct sta_info *sta;
4796 struct ieee80211_hdr *hdr;
4797 bool result;
4798 struct ieee80211_chanctx_conf *chanctx_conf;
4799
4800 sdata = vif_to_sdata(info->control.vif);
4801
4802 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) {
4803 /* update band only for non-MLD */
4804 if (!ieee80211_vif_is_mld(&sdata->vif)) {
4805 chanctx_conf =
4806 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
4807 if (unlikely(!chanctx_conf)) {
4808 dev_kfree_skb(skb);
4809 return true;
4810 }
4811 info->band = chanctx_conf->def.chan->band;
4812 }
4813 result = ieee80211_tx(sdata, NULL, skb, true);
4814 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
4815 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4816 dev_kfree_skb(skb);
4817 return true;
4818 }
4819
4820 if (IS_ERR(sta) || (sta && !sta->uploaded))
4821 sta = NULL;
4822
4823 result = ieee80211_tx_8023(sdata, skb, sta, true);
4824 } else {
4825 struct sk_buff_head skbs;
4826
4827 __skb_queue_head_init(&skbs);
4828 __skb_queue_tail(&skbs, skb);
4829
4830 hdr = (struct ieee80211_hdr *)skb->data;
4831 sta = sta_info_get(sdata, hdr->addr1);
4832
4833 result = __ieee80211_tx(local, &skbs, sta, true);
4834 }
4835
4836 return result;
4837 }
4838
4839 /*
4840 * Transmit all pending packets. Called from tasklet.
4841 */
ieee80211_tx_pending(struct tasklet_struct * t)4842 void ieee80211_tx_pending(struct tasklet_struct *t)
4843 {
4844 struct ieee80211_local *local = from_tasklet(local, t,
4845 tx_pending_tasklet);
4846 unsigned long flags;
4847 int i;
4848 bool txok;
4849
4850 rcu_read_lock();
4851
4852 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4853 for (i = 0; i < local->hw.queues; i++) {
4854 /*
4855 * If queue is stopped by something other than due to pending
4856 * frames, or we have no pending frames, proceed to next queue.
4857 */
4858 if (local->queue_stop_reasons[i] ||
4859 skb_queue_empty(&local->pending[i]))
4860 continue;
4861
4862 while (!skb_queue_empty(&local->pending[i])) {
4863 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
4864 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4865
4866 if (WARN_ON(!info->control.vif)) {
4867 ieee80211_free_txskb(&local->hw, skb);
4868 continue;
4869 }
4870
4871 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
4872 flags);
4873
4874 txok = ieee80211_tx_pending_skb(local, skb);
4875 spin_lock_irqsave(&local->queue_stop_reason_lock,
4876 flags);
4877 if (!txok)
4878 break;
4879 }
4880 }
4881 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4882
4883 rcu_read_unlock();
4884 }
4885
4886 /* functions for drivers to get certain frames */
4887
__ieee80211_beacon_add_tim(struct ieee80211_sub_if_data * sdata,struct ieee80211_link_data * link,struct ps_data * ps,struct sk_buff * skb,bool is_template)4888 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4889 struct ieee80211_link_data *link,
4890 struct ps_data *ps, struct sk_buff *skb,
4891 bool is_template)
4892 {
4893 u8 *pos, *tim;
4894 int aid0 = 0;
4895 int i, have_bits = 0, n1, n2;
4896 struct ieee80211_bss_conf *link_conf = link->conf;
4897
4898 /* Generate bitmap for TIM only if there are any STAs in power save
4899 * mode. */
4900 if (atomic_read(&ps->num_sta_ps) > 0)
4901 /* in the hope that this is faster than
4902 * checking byte-for-byte */
4903 have_bits = !bitmap_empty((unsigned long *)ps->tim,
4904 IEEE80211_MAX_AID+1);
4905 if (!is_template) {
4906 if (ps->dtim_count == 0)
4907 ps->dtim_count = link_conf->dtim_period - 1;
4908 else
4909 ps->dtim_count--;
4910 }
4911
4912 tim = pos = skb_put(skb, 5);
4913 *pos++ = WLAN_EID_TIM;
4914 *pos++ = 3;
4915 *pos++ = ps->dtim_count;
4916 *pos++ = link_conf->dtim_period;
4917
4918 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
4919 aid0 = 1;
4920
4921 ps->dtim_bc_mc = aid0 == 1;
4922
4923 if (have_bits) {
4924 /* Find largest even number N1 so that bits numbered 1 through
4925 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4926 * (N2 + 1) x 8 through 2007 are 0. */
4927 n1 = 0;
4928 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4929 if (ps->tim[i]) {
4930 n1 = i & 0xfe;
4931 break;
4932 }
4933 }
4934 n2 = n1;
4935 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4936 if (ps->tim[i]) {
4937 n2 = i;
4938 break;
4939 }
4940 }
4941
4942 /* Bitmap control */
4943 *pos++ = n1 | aid0;
4944 /* Part Virt Bitmap */
4945 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1);
4946
4947 tim[1] = n2 - n1 + 4;
4948 } else {
4949 *pos++ = aid0; /* Bitmap control */
4950
4951 if (ieee80211_get_link_sband(link)->band != NL80211_BAND_S1GHZ) {
4952 tim[1] = 4;
4953 /* Part Virt Bitmap */
4954 skb_put_u8(skb, 0);
4955 }
4956 }
4957 }
4958
ieee80211_beacon_add_tim(struct ieee80211_sub_if_data * sdata,struct ieee80211_link_data * link,struct ps_data * ps,struct sk_buff * skb,bool is_template)4959 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4960 struct ieee80211_link_data *link,
4961 struct ps_data *ps, struct sk_buff *skb,
4962 bool is_template)
4963 {
4964 struct ieee80211_local *local = sdata->local;
4965
4966 /*
4967 * Not very nice, but we want to allow the driver to call
4968 * ieee80211_beacon_get() as a response to the set_tim()
4969 * callback. That, however, is already invoked under the
4970 * sta_lock to guarantee consistent and race-free update
4971 * of the tim bitmap in mac80211 and the driver.
4972 */
4973 if (local->tim_in_locked_section) {
4974 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template);
4975 } else {
4976 spin_lock_bh(&local->tim_lock);
4977 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template);
4978 spin_unlock_bh(&local->tim_lock);
4979 }
4980
4981 return 0;
4982 }
4983
ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data * sdata,struct beacon_data * beacon,struct ieee80211_link_data * link)4984 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata,
4985 struct beacon_data *beacon,
4986 struct ieee80211_link_data *link)
4987 {
4988 u8 *beacon_data, count, max_count = 1;
4989 struct probe_resp *resp;
4990 size_t beacon_data_len;
4991 u16 *bcn_offsets;
4992 int i;
4993
4994 switch (sdata->vif.type) {
4995 case NL80211_IFTYPE_AP:
4996 beacon_data = beacon->tail;
4997 beacon_data_len = beacon->tail_len;
4998 break;
4999 case NL80211_IFTYPE_ADHOC:
5000 beacon_data = beacon->head;
5001 beacon_data_len = beacon->head_len;
5002 break;
5003 case NL80211_IFTYPE_MESH_POINT:
5004 beacon_data = beacon->head;
5005 beacon_data_len = beacon->head_len;
5006 break;
5007 default:
5008 return;
5009 }
5010
5011 resp = rcu_dereference(link->u.ap.probe_resp);
5012
5013 bcn_offsets = beacon->cntdwn_counter_offsets;
5014 count = beacon->cntdwn_current_counter;
5015 if (link->conf->csa_active)
5016 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM;
5017
5018 for (i = 0; i < max_count; ++i) {
5019 if (bcn_offsets[i]) {
5020 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len))
5021 return;
5022 beacon_data[bcn_offsets[i]] = count;
5023 }
5024
5025 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) {
5026 u16 *resp_offsets = resp->cntdwn_counter_offsets;
5027
5028 resp->data[resp_offsets[i]] = count;
5029 }
5030 }
5031 }
5032
__ieee80211_beacon_update_cntdwn(struct beacon_data * beacon)5033 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon)
5034 {
5035 beacon->cntdwn_current_counter--;
5036
5037 /* the counter should never reach 0 */
5038 WARN_ON_ONCE(!beacon->cntdwn_current_counter);
5039
5040 return beacon->cntdwn_current_counter;
5041 }
5042
ieee80211_beacon_update_cntdwn(struct ieee80211_vif * vif,unsigned int link_id)5043 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id)
5044 {
5045 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5046 struct ieee80211_link_data *link;
5047 struct beacon_data *beacon = NULL;
5048 u8 count = 0;
5049
5050 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS))
5051 return 0;
5052
5053 rcu_read_lock();
5054
5055 link = rcu_dereference(sdata->link[link_id]);
5056 if (!link)
5057 goto unlock;
5058
5059 if (sdata->vif.type == NL80211_IFTYPE_AP)
5060 beacon = rcu_dereference(link->u.ap.beacon);
5061 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
5062 beacon = rcu_dereference(sdata->u.ibss.presp);
5063 else if (ieee80211_vif_is_mesh(&sdata->vif))
5064 beacon = rcu_dereference(sdata->u.mesh.beacon);
5065
5066 if (!beacon)
5067 goto unlock;
5068
5069 count = __ieee80211_beacon_update_cntdwn(beacon);
5070
5071 unlock:
5072 rcu_read_unlock();
5073 return count;
5074 }
5075 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn);
5076
ieee80211_beacon_set_cntdwn(struct ieee80211_vif * vif,u8 counter)5077 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter)
5078 {
5079 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5080 struct beacon_data *beacon = NULL;
5081
5082 rcu_read_lock();
5083
5084 if (sdata->vif.type == NL80211_IFTYPE_AP)
5085 beacon = rcu_dereference(sdata->deflink.u.ap.beacon);
5086 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
5087 beacon = rcu_dereference(sdata->u.ibss.presp);
5088 else if (ieee80211_vif_is_mesh(&sdata->vif))
5089 beacon = rcu_dereference(sdata->u.mesh.beacon);
5090
5091 if (!beacon)
5092 goto unlock;
5093
5094 if (counter < beacon->cntdwn_current_counter)
5095 beacon->cntdwn_current_counter = counter;
5096
5097 unlock:
5098 rcu_read_unlock();
5099 }
5100 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn);
5101
ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif * vif,unsigned int link_id)5102 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif,
5103 unsigned int link_id)
5104 {
5105 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5106 struct ieee80211_link_data *link;
5107 struct beacon_data *beacon = NULL;
5108 u8 *beacon_data;
5109 size_t beacon_data_len;
5110 int ret = false;
5111
5112 if (!ieee80211_sdata_running(sdata))
5113 return false;
5114
5115 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS))
5116 return 0;
5117
5118 rcu_read_lock();
5119
5120 link = rcu_dereference(sdata->link[link_id]);
5121 if (!link)
5122 goto out;
5123
5124 if (vif->type == NL80211_IFTYPE_AP) {
5125 beacon = rcu_dereference(link->u.ap.beacon);
5126 if (WARN_ON(!beacon || !beacon->tail))
5127 goto out;
5128 beacon_data = beacon->tail;
5129 beacon_data_len = beacon->tail_len;
5130 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
5131 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
5132
5133 beacon = rcu_dereference(ifibss->presp);
5134 if (!beacon)
5135 goto out;
5136
5137 beacon_data = beacon->head;
5138 beacon_data_len = beacon->head_len;
5139 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
5140 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
5141
5142 beacon = rcu_dereference(ifmsh->beacon);
5143 if (!beacon)
5144 goto out;
5145
5146 beacon_data = beacon->head;
5147 beacon_data_len = beacon->head_len;
5148 } else {
5149 WARN_ON(1);
5150 goto out;
5151 }
5152
5153 if (!beacon->cntdwn_counter_offsets[0])
5154 goto out;
5155
5156 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len))
5157 goto out;
5158
5159 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1)
5160 ret = true;
5161
5162 out:
5163 rcu_read_unlock();
5164
5165 return ret;
5166 }
5167 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete);
5168
ieee80211_beacon_protect(struct sk_buff * skb,struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct ieee80211_link_data * link)5169 static int ieee80211_beacon_protect(struct sk_buff *skb,
5170 struct ieee80211_local *local,
5171 struct ieee80211_sub_if_data *sdata,
5172 struct ieee80211_link_data *link)
5173 {
5174 ieee80211_tx_result res;
5175 struct ieee80211_tx_data tx;
5176 struct sk_buff *check_skb;
5177
5178 memset(&tx, 0, sizeof(tx));
5179 tx.key = rcu_dereference(link->default_beacon_key);
5180 if (!tx.key)
5181 return 0;
5182
5183 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) {
5184 tx.key = NULL;
5185 return -EINVAL;
5186 }
5187
5188 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
5189 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
5190 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf;
5191
5192 tx.local = local;
5193 tx.sdata = sdata;
5194 __skb_queue_head_init(&tx.skbs);
5195 __skb_queue_tail(&tx.skbs, skb);
5196 res = ieee80211_tx_h_encrypt(&tx);
5197 check_skb = __skb_dequeue(&tx.skbs);
5198 /* we may crash after this, but it'd be a bug in crypto */
5199 WARN_ON(check_skb != skb);
5200 if (WARN_ON_ONCE(res != TX_CONTINUE))
5201 return -EINVAL;
5202
5203 return 0;
5204 }
5205
5206 static void
ieee80211_beacon_get_finish(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_link_data * link,struct ieee80211_mutable_offsets * offs,struct beacon_data * beacon,struct sk_buff * skb,struct ieee80211_chanctx_conf * chanctx_conf,u16 csa_off_base)5207 ieee80211_beacon_get_finish(struct ieee80211_hw *hw,
5208 struct ieee80211_vif *vif,
5209 struct ieee80211_link_data *link,
5210 struct ieee80211_mutable_offsets *offs,
5211 struct beacon_data *beacon,
5212 struct sk_buff *skb,
5213 struct ieee80211_chanctx_conf *chanctx_conf,
5214 u16 csa_off_base)
5215 {
5216 struct ieee80211_local *local = hw_to_local(hw);
5217 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5218 struct ieee80211_tx_info *info;
5219 enum nl80211_band band;
5220 struct ieee80211_tx_rate_control txrc;
5221
5222 /* CSA offsets */
5223 if (offs && beacon) {
5224 u16 i;
5225
5226 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) {
5227 u16 csa_off = beacon->cntdwn_counter_offsets[i];
5228
5229 if (!csa_off)
5230 continue;
5231
5232 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off;
5233 }
5234 }
5235
5236 band = chanctx_conf->def.chan->band;
5237 info = IEEE80211_SKB_CB(skb);
5238 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
5239 info->flags |= IEEE80211_TX_CTL_NO_ACK;
5240 info->band = band;
5241
5242 memset(&txrc, 0, sizeof(txrc));
5243 txrc.hw = hw;
5244 txrc.sband = local->hw.wiphy->bands[band];
5245 txrc.bss_conf = link->conf;
5246 txrc.skb = skb;
5247 txrc.reported_rate.idx = -1;
5248 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band])
5249 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band];
5250 else
5251 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
5252 txrc.bss = true;
5253 rate_control_get_rate(sdata, NULL, &txrc);
5254
5255 info->control.vif = vif;
5256 info->control.flags |= u32_encode_bits(link->link_id,
5257 IEEE80211_TX_CTRL_MLO_LINK);
5258 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
5259 IEEE80211_TX_CTL_ASSIGN_SEQ |
5260 IEEE80211_TX_CTL_FIRST_FRAGMENT;
5261 }
5262
5263 static void
ieee80211_beacon_add_mbssid(struct sk_buff * skb,struct beacon_data * beacon,u8 i)5264 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon,
5265 u8 i)
5266 {
5267 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt ||
5268 i > beacon->mbssid_ies->cnt)
5269 return;
5270
5271 if (i < beacon->mbssid_ies->cnt) {
5272 skb_put_data(skb, beacon->mbssid_ies->elem[i].data,
5273 beacon->mbssid_ies->elem[i].len);
5274
5275 if (beacon->rnr_ies && beacon->rnr_ies->cnt) {
5276 skb_put_data(skb, beacon->rnr_ies->elem[i].data,
5277 beacon->rnr_ies->elem[i].len);
5278
5279 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++)
5280 skb_put_data(skb, beacon->rnr_ies->elem[i].data,
5281 beacon->rnr_ies->elem[i].len);
5282 }
5283 return;
5284 }
5285
5286 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */
5287 for (i = 0; i < beacon->mbssid_ies->cnt; i++)
5288 skb_put_data(skb, beacon->mbssid_ies->elem[i].data,
5289 beacon->mbssid_ies->elem[i].len);
5290 }
5291
5292 static struct sk_buff *
ieee80211_beacon_get_ap(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_link_data * link,struct ieee80211_mutable_offsets * offs,bool is_template,struct beacon_data * beacon,struct ieee80211_chanctx_conf * chanctx_conf,u8 ema_index)5293 ieee80211_beacon_get_ap(struct ieee80211_hw *hw,
5294 struct ieee80211_vif *vif,
5295 struct ieee80211_link_data *link,
5296 struct ieee80211_mutable_offsets *offs,
5297 bool is_template,
5298 struct beacon_data *beacon,
5299 struct ieee80211_chanctx_conf *chanctx_conf,
5300 u8 ema_index)
5301 {
5302 struct ieee80211_local *local = hw_to_local(hw);
5303 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5304 struct ieee80211_if_ap *ap = &sdata->u.ap;
5305 struct sk_buff *skb = NULL;
5306 u16 csa_off_base = 0;
5307 int mbssid_len;
5308
5309 if (beacon->cntdwn_counter_offsets[0]) {
5310 if (!is_template)
5311 ieee80211_beacon_update_cntdwn(vif, link->link_id);
5312
5313 ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5314 }
5315
5316 /* headroom, head length,
5317 * tail length, maximum TIM length and multiple BSSID length
5318 */
5319 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies,
5320 beacon->rnr_ies,
5321 ema_index);
5322
5323 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
5324 beacon->tail_len + 256 +
5325 local->hw.extra_beacon_tailroom + mbssid_len);
5326 if (!skb)
5327 return NULL;
5328
5329 skb_reserve(skb, local->tx_headroom);
5330 skb_put_data(skb, beacon->head, beacon->head_len);
5331
5332 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template);
5333
5334 if (offs) {
5335 offs->tim_offset = beacon->head_len;
5336 offs->tim_length = skb->len - beacon->head_len;
5337 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0];
5338
5339 if (mbssid_len) {
5340 ieee80211_beacon_add_mbssid(skb, beacon, ema_index);
5341 offs->mbssid_off = skb->len - mbssid_len;
5342 }
5343
5344 /* for AP the csa offsets are from tail */
5345 csa_off_base = skb->len;
5346 }
5347
5348 if (beacon->tail)
5349 skb_put_data(skb, beacon->tail, beacon->tail_len);
5350
5351 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) {
5352 dev_kfree_skb(skb);
5353 return NULL;
5354 }
5355
5356 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5357 chanctx_conf, csa_off_base);
5358 return skb;
5359 }
5360
5361 static struct ieee80211_ema_beacons *
ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_link_data * link,struct ieee80211_mutable_offsets * offs,bool is_template,struct beacon_data * beacon,struct ieee80211_chanctx_conf * chanctx_conf)5362 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw,
5363 struct ieee80211_vif *vif,
5364 struct ieee80211_link_data *link,
5365 struct ieee80211_mutable_offsets *offs,
5366 bool is_template, struct beacon_data *beacon,
5367 struct ieee80211_chanctx_conf *chanctx_conf)
5368 {
5369 struct ieee80211_ema_beacons *ema = NULL;
5370
5371 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt)
5372 return NULL;
5373
5374 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt),
5375 GFP_ATOMIC);
5376 if (!ema)
5377 return NULL;
5378
5379 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) {
5380 ema->bcn[ema->cnt].skb =
5381 ieee80211_beacon_get_ap(hw, vif, link,
5382 &ema->bcn[ema->cnt].offs,
5383 is_template, beacon,
5384 chanctx_conf, ema->cnt);
5385 if (!ema->bcn[ema->cnt].skb)
5386 break;
5387 }
5388
5389 if (ema->cnt == beacon->mbssid_ies->cnt)
5390 return ema;
5391
5392 ieee80211_beacon_free_ema_list(ema);
5393 return NULL;
5394 }
5395
5396 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1
5397
5398 static struct sk_buff *
__ieee80211_beacon_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs,bool is_template,unsigned int link_id,int ema_index,struct ieee80211_ema_beacons ** ema_beacons)5399 __ieee80211_beacon_get(struct ieee80211_hw *hw,
5400 struct ieee80211_vif *vif,
5401 struct ieee80211_mutable_offsets *offs,
5402 bool is_template,
5403 unsigned int link_id,
5404 int ema_index,
5405 struct ieee80211_ema_beacons **ema_beacons)
5406 {
5407 struct ieee80211_local *local = hw_to_local(hw);
5408 struct beacon_data *beacon = NULL;
5409 struct sk_buff *skb = NULL;
5410 struct ieee80211_sub_if_data *sdata = NULL;
5411 struct ieee80211_chanctx_conf *chanctx_conf;
5412 struct ieee80211_link_data *link;
5413
5414 rcu_read_lock();
5415
5416 sdata = vif_to_sdata(vif);
5417 link = rcu_dereference(sdata->link[link_id]);
5418 if (!link)
5419 goto out;
5420 chanctx_conf =
5421 rcu_dereference(link->conf->chanctx_conf);
5422
5423 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
5424 goto out;
5425
5426 if (offs)
5427 memset(offs, 0, sizeof(*offs));
5428
5429 if (sdata->vif.type == NL80211_IFTYPE_AP) {
5430 beacon = rcu_dereference(link->u.ap.beacon);
5431 if (!beacon)
5432 goto out;
5433
5434 if (ema_beacons) {
5435 *ema_beacons =
5436 ieee80211_beacon_get_ap_ema_list(hw, vif, link,
5437 offs,
5438 is_template,
5439 beacon,
5440 chanctx_conf);
5441 } else {
5442 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) {
5443 if (ema_index >= beacon->mbssid_ies->cnt)
5444 goto out; /* End of MBSSID elements */
5445
5446 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS)
5447 ema_index = beacon->mbssid_ies->cnt;
5448 } else {
5449 ema_index = 0;
5450 }
5451
5452 skb = ieee80211_beacon_get_ap(hw, vif, link, offs,
5453 is_template, beacon,
5454 chanctx_conf,
5455 ema_index);
5456 }
5457 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
5458 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
5459 struct ieee80211_hdr *hdr;
5460
5461 beacon = rcu_dereference(ifibss->presp);
5462 if (!beacon)
5463 goto out;
5464
5465 if (beacon->cntdwn_counter_offsets[0]) {
5466 if (!is_template)
5467 __ieee80211_beacon_update_cntdwn(beacon);
5468
5469 ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5470 }
5471
5472 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
5473 local->hw.extra_beacon_tailroom);
5474 if (!skb)
5475 goto out;
5476 skb_reserve(skb, local->tx_headroom);
5477 skb_put_data(skb, beacon->head, beacon->head_len);
5478
5479 hdr = (struct ieee80211_hdr *) skb->data;
5480 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
5481 IEEE80211_STYPE_BEACON);
5482
5483 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5484 chanctx_conf, 0);
5485 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
5486 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
5487
5488 beacon = rcu_dereference(ifmsh->beacon);
5489 if (!beacon)
5490 goto out;
5491
5492 if (beacon->cntdwn_counter_offsets[0]) {
5493 if (!is_template)
5494 /* TODO: For mesh csa_counter is in TU, so
5495 * decrementing it by one isn't correct, but
5496 * for now we leave it consistent with overall
5497 * mac80211's behavior.
5498 */
5499 __ieee80211_beacon_update_cntdwn(beacon);
5500
5501 ieee80211_set_beacon_cntdwn(sdata, beacon, link);
5502 }
5503
5504 if (ifmsh->sync_ops)
5505 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
5506
5507 skb = dev_alloc_skb(local->tx_headroom +
5508 beacon->head_len +
5509 256 + /* TIM IE */
5510 beacon->tail_len +
5511 local->hw.extra_beacon_tailroom);
5512 if (!skb)
5513 goto out;
5514 skb_reserve(skb, local->tx_headroom);
5515 skb_put_data(skb, beacon->head, beacon->head_len);
5516 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb,
5517 is_template);
5518
5519 if (offs) {
5520 offs->tim_offset = beacon->head_len;
5521 offs->tim_length = skb->len - beacon->head_len;
5522 }
5523
5524 skb_put_data(skb, beacon->tail, beacon->tail_len);
5525 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
5526 chanctx_conf, 0);
5527 } else {
5528 WARN_ON(1);
5529 goto out;
5530 }
5531
5532 out:
5533 rcu_read_unlock();
5534 return skb;
5535
5536 }
5537
5538 struct sk_buff *
ieee80211_beacon_get_template(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs,unsigned int link_id)5539 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
5540 struct ieee80211_vif *vif,
5541 struct ieee80211_mutable_offsets *offs,
5542 unsigned int link_id)
5543 {
5544 return __ieee80211_beacon_get(hw, vif, offs, true, link_id,
5545 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL);
5546 }
5547 EXPORT_SYMBOL(ieee80211_beacon_get_template);
5548
5549 struct sk_buff *
ieee80211_beacon_get_template_ema_index(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_mutable_offsets * offs,unsigned int link_id,u8 ema_index)5550 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw,
5551 struct ieee80211_vif *vif,
5552 struct ieee80211_mutable_offsets *offs,
5553 unsigned int link_id, u8 ema_index)
5554 {
5555 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index,
5556 NULL);
5557 }
5558 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index);
5559
ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons * ema_beacons)5560 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons)
5561 {
5562 u8 i;
5563
5564 if (!ema_beacons)
5565 return;
5566
5567 for (i = 0; i < ema_beacons->cnt; i++)
5568 kfree_skb(ema_beacons->bcn[i].skb);
5569
5570 kfree(ema_beacons);
5571 }
5572 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list);
5573
5574 struct ieee80211_ema_beacons *
ieee80211_beacon_get_template_ema_list(struct ieee80211_hw * hw,struct ieee80211_vif * vif,unsigned int link_id)5575 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw,
5576 struct ieee80211_vif *vif,
5577 unsigned int link_id)
5578 {
5579 struct ieee80211_ema_beacons *ema_beacons = NULL;
5580
5581 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0,
5582 &ema_beacons));
5583
5584 return ema_beacons;
5585 }
5586 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list);
5587
ieee80211_beacon_get_tim(struct ieee80211_hw * hw,struct ieee80211_vif * vif,u16 * tim_offset,u16 * tim_length,unsigned int link_id)5588 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
5589 struct ieee80211_vif *vif,
5590 u16 *tim_offset, u16 *tim_length,
5591 unsigned int link_id)
5592 {
5593 struct ieee80211_mutable_offsets offs = {};
5594 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false,
5595 link_id,
5596 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS,
5597 NULL);
5598 struct sk_buff *copy;
5599
5600 if (!bcn)
5601 return bcn;
5602
5603 if (tim_offset)
5604 *tim_offset = offs.tim_offset;
5605
5606 if (tim_length)
5607 *tim_length = offs.tim_length;
5608
5609 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
5610 !hw_to_local(hw)->monitors)
5611 return bcn;
5612
5613 /* send a copy to monitor interfaces */
5614 copy = skb_copy(bcn, GFP_ATOMIC);
5615 if (!copy)
5616 return bcn;
5617
5618 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, false, NULL);
5619
5620 return bcn;
5621 }
5622 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
5623
ieee80211_proberesp_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5624 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
5625 struct ieee80211_vif *vif)
5626 {
5627 struct sk_buff *skb = NULL;
5628 struct probe_resp *presp = NULL;
5629 struct ieee80211_hdr *hdr;
5630 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5631
5632 if (sdata->vif.type != NL80211_IFTYPE_AP)
5633 return NULL;
5634
5635 rcu_read_lock();
5636 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp);
5637 if (!presp)
5638 goto out;
5639
5640 skb = dev_alloc_skb(presp->len);
5641 if (!skb)
5642 goto out;
5643
5644 skb_put_data(skb, presp->data, presp->len);
5645
5646 hdr = (struct ieee80211_hdr *) skb->data;
5647 memset(hdr->addr1, 0, sizeof(hdr->addr1));
5648
5649 out:
5650 rcu_read_unlock();
5651 return skb;
5652 }
5653 EXPORT_SYMBOL(ieee80211_proberesp_get);
5654
ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5655 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw,
5656 struct ieee80211_vif *vif)
5657 {
5658 struct sk_buff *skb = NULL;
5659 struct fils_discovery_data *tmpl = NULL;
5660 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5661
5662 if (sdata->vif.type != NL80211_IFTYPE_AP)
5663 return NULL;
5664
5665 rcu_read_lock();
5666 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery);
5667 if (!tmpl) {
5668 rcu_read_unlock();
5669 return NULL;
5670 }
5671
5672 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
5673 if (skb) {
5674 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
5675 skb_put_data(skb, tmpl->data, tmpl->len);
5676 }
5677
5678 rcu_read_unlock();
5679 return skb;
5680 }
5681 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl);
5682
5683 struct sk_buff *
ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5684 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw,
5685 struct ieee80211_vif *vif)
5686 {
5687 struct sk_buff *skb = NULL;
5688 struct unsol_bcast_probe_resp_data *tmpl = NULL;
5689 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5690
5691 if (sdata->vif.type != NL80211_IFTYPE_AP)
5692 return NULL;
5693
5694 rcu_read_lock();
5695 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp);
5696 if (!tmpl) {
5697 rcu_read_unlock();
5698 return NULL;
5699 }
5700
5701 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
5702 if (skb) {
5703 skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
5704 skb_put_data(skb, tmpl->data, tmpl->len);
5705 }
5706
5707 rcu_read_unlock();
5708 return skb;
5709 }
5710 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl);
5711
ieee80211_pspoll_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5712 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
5713 struct ieee80211_vif *vif)
5714 {
5715 struct ieee80211_sub_if_data *sdata;
5716 struct ieee80211_pspoll *pspoll;
5717 struct ieee80211_local *local;
5718 struct sk_buff *skb;
5719
5720 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
5721 return NULL;
5722
5723 sdata = vif_to_sdata(vif);
5724 local = sdata->local;
5725
5726 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
5727 if (!skb)
5728 return NULL;
5729
5730 skb_reserve(skb, local->hw.extra_tx_headroom);
5731
5732 pspoll = skb_put_zero(skb, sizeof(*pspoll));
5733 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
5734 IEEE80211_STYPE_PSPOLL);
5735 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid);
5736
5737 /* aid in PS-Poll has its two MSBs each set to 1 */
5738 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
5739
5740 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
5741 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
5742
5743 return skb;
5744 }
5745 EXPORT_SYMBOL(ieee80211_pspoll_get);
5746
ieee80211_nullfunc_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,int link_id,bool qos_ok)5747 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
5748 struct ieee80211_vif *vif,
5749 int link_id, bool qos_ok)
5750 {
5751 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
5752 struct ieee80211_local *local = sdata->local;
5753 struct ieee80211_link_data *link = NULL;
5754 struct ieee80211_hdr_3addr *nullfunc;
5755 struct sk_buff *skb;
5756 bool qos = false;
5757
5758 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
5759 return NULL;
5760
5761 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
5762 sizeof(*nullfunc) + 2);
5763 if (!skb)
5764 return NULL;
5765
5766 rcu_read_lock();
5767 if (qos_ok) {
5768 struct sta_info *sta;
5769
5770 sta = sta_info_get(sdata, vif->cfg.ap_addr);
5771 qos = sta && sta->sta.wme;
5772 }
5773
5774 if (link_id >= 0) {
5775 link = rcu_dereference(sdata->link[link_id]);
5776 if (WARN_ON_ONCE(!link)) {
5777 rcu_read_unlock();
5778 kfree_skb(skb);
5779 return NULL;
5780 }
5781 }
5782
5783 skb_reserve(skb, local->hw.extra_tx_headroom);
5784
5785 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
5786 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
5787 IEEE80211_STYPE_NULLFUNC |
5788 IEEE80211_FCTL_TODS);
5789 if (qos) {
5790 __le16 qoshdr = cpu_to_le16(7);
5791
5792 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
5793 IEEE80211_STYPE_NULLFUNC) !=
5794 IEEE80211_STYPE_QOS_NULLFUNC);
5795 nullfunc->frame_control |=
5796 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
5797 skb->priority = 7;
5798 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
5799 skb_put_data(skb, &qoshdr, sizeof(qoshdr));
5800 }
5801
5802 if (link) {
5803 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN);
5804 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN);
5805 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN);
5806 } else {
5807 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN);
5808 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
5809 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN);
5810 }
5811 rcu_read_unlock();
5812
5813 return skb;
5814 }
5815 EXPORT_SYMBOL(ieee80211_nullfunc_get);
5816
ieee80211_probereq_get(struct ieee80211_hw * hw,const u8 * src_addr,const u8 * ssid,size_t ssid_len,size_t tailroom)5817 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
5818 const u8 *src_addr,
5819 const u8 *ssid, size_t ssid_len,
5820 size_t tailroom)
5821 {
5822 struct ieee80211_local *local = hw_to_local(hw);
5823 struct ieee80211_hdr_3addr *hdr;
5824 struct sk_buff *skb;
5825 size_t ie_ssid_len;
5826 u8 *pos;
5827
5828 ie_ssid_len = 2 + ssid_len;
5829
5830 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
5831 ie_ssid_len + tailroom);
5832 if (!skb)
5833 return NULL;
5834
5835 skb_reserve(skb, local->hw.extra_tx_headroom);
5836
5837 hdr = skb_put_zero(skb, sizeof(*hdr));
5838 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
5839 IEEE80211_STYPE_PROBE_REQ);
5840 eth_broadcast_addr(hdr->addr1);
5841 memcpy(hdr->addr2, src_addr, ETH_ALEN);
5842 eth_broadcast_addr(hdr->addr3);
5843
5844 pos = skb_put(skb, ie_ssid_len);
5845 *pos++ = WLAN_EID_SSID;
5846 *pos++ = ssid_len;
5847 if (ssid_len)
5848 memcpy(pos, ssid, ssid_len);
5849 pos += ssid_len;
5850
5851 return skb;
5852 }
5853 EXPORT_SYMBOL(ieee80211_probereq_get);
5854
ieee80211_rts_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const void * frame,size_t frame_len,const struct ieee80211_tx_info * frame_txctl,struct ieee80211_rts * rts)5855 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5856 const void *frame, size_t frame_len,
5857 const struct ieee80211_tx_info *frame_txctl,
5858 struct ieee80211_rts *rts)
5859 {
5860 const struct ieee80211_hdr *hdr = frame;
5861
5862 rts->frame_control =
5863 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
5864 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
5865 frame_txctl);
5866 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
5867 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
5868 }
5869 EXPORT_SYMBOL(ieee80211_rts_get);
5870
ieee80211_ctstoself_get(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const void * frame,size_t frame_len,const struct ieee80211_tx_info * frame_txctl,struct ieee80211_cts * cts)5871 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5872 const void *frame, size_t frame_len,
5873 const struct ieee80211_tx_info *frame_txctl,
5874 struct ieee80211_cts *cts)
5875 {
5876 const struct ieee80211_hdr *hdr = frame;
5877
5878 cts->frame_control =
5879 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
5880 cts->duration = ieee80211_ctstoself_duration(hw, vif,
5881 frame_len, frame_txctl);
5882 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
5883 }
5884 EXPORT_SYMBOL(ieee80211_ctstoself_get);
5885
5886 struct sk_buff *
ieee80211_get_buffered_bc(struct ieee80211_hw * hw,struct ieee80211_vif * vif)5887 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
5888 struct ieee80211_vif *vif)
5889 {
5890 struct ieee80211_local *local = hw_to_local(hw);
5891 struct sk_buff *skb = NULL;
5892 struct ieee80211_tx_data tx;
5893 struct ieee80211_sub_if_data *sdata;
5894 struct ps_data *ps;
5895 struct ieee80211_tx_info *info;
5896 struct ieee80211_chanctx_conf *chanctx_conf;
5897
5898 sdata = vif_to_sdata(vif);
5899
5900 rcu_read_lock();
5901 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
5902
5903 if (!chanctx_conf)
5904 goto out;
5905
5906 if (sdata->vif.type == NL80211_IFTYPE_AP) {
5907 struct beacon_data *beacon =
5908 rcu_dereference(sdata->deflink.u.ap.beacon);
5909
5910 if (!beacon || !beacon->head)
5911 goto out;
5912
5913 ps = &sdata->u.ap.ps;
5914 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
5915 ps = &sdata->u.mesh.ps;
5916 } else {
5917 goto out;
5918 }
5919
5920 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
5921 goto out; /* send buffered bc/mc only after DTIM beacon */
5922
5923 while (1) {
5924 skb = skb_dequeue(&ps->bc_buf);
5925 if (!skb)
5926 goto out;
5927 local->total_ps_buffered--;
5928
5929 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
5930 struct ieee80211_hdr *hdr =
5931 (struct ieee80211_hdr *) skb->data;
5932 /* more buffered multicast/broadcast frames ==> set
5933 * MoreData flag in IEEE 802.11 header to inform PS
5934 * STAs */
5935 hdr->frame_control |=
5936 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
5937 }
5938
5939 if (sdata->vif.type == NL80211_IFTYPE_AP)
5940 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
5941 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
5942 break;
5943 ieee80211_free_txskb(hw, skb);
5944 }
5945
5946 info = IEEE80211_SKB_CB(skb);
5947
5948 tx.flags |= IEEE80211_TX_PS_BUFFERED;
5949 info->band = chanctx_conf->def.chan->band;
5950
5951 if (invoke_tx_handlers(&tx))
5952 skb = NULL;
5953 out:
5954 rcu_read_unlock();
5955
5956 return skb;
5957 }
5958 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
5959
ieee80211_reserve_tid(struct ieee80211_sta * pubsta,u8 tid)5960 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
5961 {
5962 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
5963 struct ieee80211_sub_if_data *sdata = sta->sdata;
5964 struct ieee80211_local *local = sdata->local;
5965 int ret;
5966 u32 queues;
5967
5968 lockdep_assert_wiphy(local->hw.wiphy);
5969
5970 /* only some cases are supported right now */
5971 switch (sdata->vif.type) {
5972 case NL80211_IFTYPE_STATION:
5973 case NL80211_IFTYPE_AP:
5974 case NL80211_IFTYPE_AP_VLAN:
5975 break;
5976 default:
5977 WARN_ON(1);
5978 return -EINVAL;
5979 }
5980
5981 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
5982 return -EINVAL;
5983
5984 if (sta->reserved_tid == tid) {
5985 ret = 0;
5986 goto out;
5987 }
5988
5989 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
5990 sdata_err(sdata, "TID reservation already active\n");
5991 ret = -EALREADY;
5992 goto out;
5993 }
5994
5995 ieee80211_stop_vif_queues(sdata->local, sdata,
5996 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
5997
5998 synchronize_net();
5999
6000 /* Tear down BA sessions so we stop aggregating on this TID */
6001 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
6002 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
6003 __ieee80211_stop_tx_ba_session(sta, tid,
6004 AGG_STOP_LOCAL_REQUEST);
6005 }
6006
6007 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
6008 __ieee80211_flush_queues(local, sdata, queues, false);
6009
6010 sta->reserved_tid = tid;
6011
6012 ieee80211_wake_vif_queues(local, sdata,
6013 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
6014
6015 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
6016 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
6017
6018 ret = 0;
6019 out:
6020 return ret;
6021 }
6022 EXPORT_SYMBOL(ieee80211_reserve_tid);
6023
ieee80211_unreserve_tid(struct ieee80211_sta * pubsta,u8 tid)6024 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
6025 {
6026 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
6027 struct ieee80211_sub_if_data *sdata = sta->sdata;
6028
6029 lockdep_assert_wiphy(sdata->local->hw.wiphy);
6030
6031 /* only some cases are supported right now */
6032 switch (sdata->vif.type) {
6033 case NL80211_IFTYPE_STATION:
6034 case NL80211_IFTYPE_AP:
6035 case NL80211_IFTYPE_AP_VLAN:
6036 break;
6037 default:
6038 WARN_ON(1);
6039 return;
6040 }
6041
6042 if (tid != sta->reserved_tid) {
6043 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
6044 return;
6045 }
6046
6047 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
6048 }
6049 EXPORT_SYMBOL(ieee80211_unreserve_tid);
6050
__ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int tid,int link_id,enum nl80211_band band)6051 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
6052 struct sk_buff *skb, int tid, int link_id,
6053 enum nl80211_band band)
6054 {
6055 const struct ieee80211_hdr *hdr = (void *)skb->data;
6056 int ac = ieee80211_ac_from_tid(tid);
6057 unsigned int link;
6058
6059 skb_reset_mac_header(skb);
6060 skb_set_queue_mapping(skb, ac);
6061 skb->priority = tid;
6062
6063 skb->dev = sdata->dev;
6064
6065 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS);
6066 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK,
6067 IEEE80211_LINK_UNSPECIFIED));
6068
6069 if (!ieee80211_vif_is_mld(&sdata->vif)) {
6070 link = 0;
6071 } else if (link_id >= 0) {
6072 link = link_id;
6073 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) {
6074 /* address from the MLD */
6075 link = IEEE80211_LINK_UNSPECIFIED;
6076 } else {
6077 /* otherwise must be addressed from a link */
6078 rcu_read_lock();
6079 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) {
6080 struct ieee80211_bss_conf *link_conf;
6081
6082 link_conf = rcu_dereference(sdata->vif.link_conf[link]);
6083 if (!link_conf)
6084 continue;
6085 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0)
6086 break;
6087 }
6088 rcu_read_unlock();
6089
6090 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf)))
6091 link = ffs(sdata->vif.active_links) - 1;
6092 }
6093
6094 IEEE80211_SKB_CB(skb)->control.flags |=
6095 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK);
6096
6097 /*
6098 * The other path calling ieee80211_xmit is from the tasklet,
6099 * and while we can handle concurrent transmissions locking
6100 * requirements are that we do not come into tx with bhs on.
6101 */
6102 local_bh_disable();
6103 IEEE80211_SKB_CB(skb)->band = band;
6104 ieee80211_xmit(sdata, NULL, skb);
6105 local_bh_enable();
6106 }
6107
ieee80211_tx_skb_tid(struct ieee80211_sub_if_data * sdata,struct sk_buff * skb,int tid,int link_id)6108 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
6109 struct sk_buff *skb, int tid, int link_id)
6110 {
6111 struct ieee80211_chanctx_conf *chanctx_conf;
6112 enum nl80211_band band;
6113
6114 rcu_read_lock();
6115 if (!ieee80211_vif_is_mld(&sdata->vif)) {
6116 WARN_ON(link_id >= 0);
6117 chanctx_conf =
6118 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
6119 if (WARN_ON(!chanctx_conf)) {
6120 rcu_read_unlock();
6121 kfree_skb(skb);
6122 return;
6123 }
6124 band = chanctx_conf->def.chan->band;
6125 } else {
6126 WARN_ON(link_id >= 0 &&
6127 !(sdata->vif.active_links & BIT(link_id)));
6128 /* MLD transmissions must not rely on the band */
6129 band = 0;
6130 }
6131
6132 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band);
6133 rcu_read_unlock();
6134 }
6135
ieee80211_tx_control_port(struct wiphy * wiphy,struct net_device * dev,const u8 * buf,size_t len,const u8 * dest,__be16 proto,bool unencrypted,int link_id,u64 * cookie)6136 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
6137 const u8 *buf, size_t len,
6138 const u8 *dest, __be16 proto, bool unencrypted,
6139 int link_id, u64 *cookie)
6140 {
6141 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
6142 struct ieee80211_local *local = sdata->local;
6143 struct sta_info *sta;
6144 struct sk_buff *skb;
6145 struct ethhdr *ehdr;
6146 u32 ctrl_flags = 0;
6147 u32 flags = 0;
6148 int err;
6149
6150 /* mutex lock is only needed for incrementing the cookie counter */
6151 lockdep_assert_wiphy(local->hw.wiphy);
6152
6153 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
6154 * or Pre-Authentication
6155 */
6156 if (proto != sdata->control_port_protocol &&
6157 proto != cpu_to_be16(ETH_P_PREAUTH))
6158 return -EINVAL;
6159
6160 if (proto == sdata->control_port_protocol)
6161 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO |
6162 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
6163
6164 if (unencrypted)
6165 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
6166
6167 if (cookie)
6168 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
6169
6170 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX;
6171
6172 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
6173 sizeof(struct ethhdr) + len);
6174 if (!skb)
6175 return -ENOMEM;
6176
6177 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
6178
6179 skb_put_data(skb, buf, len);
6180
6181 ehdr = skb_push(skb, sizeof(struct ethhdr));
6182 memcpy(ehdr->h_dest, dest, ETH_ALEN);
6183
6184 /* we may override the SA for MLO STA later */
6185 if (link_id < 0) {
6186 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED,
6187 IEEE80211_TX_CTRL_MLO_LINK);
6188 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
6189 } else {
6190 struct ieee80211_bss_conf *link_conf;
6191
6192 ctrl_flags |= u32_encode_bits(link_id,
6193 IEEE80211_TX_CTRL_MLO_LINK);
6194
6195 rcu_read_lock();
6196 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]);
6197 if (!link_conf) {
6198 dev_kfree_skb(skb);
6199 rcu_read_unlock();
6200 return -ENOLINK;
6201 }
6202 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN);
6203 rcu_read_unlock();
6204 }
6205
6206 ehdr->h_proto = proto;
6207
6208 skb->dev = dev;
6209 skb->protocol = proto;
6210 skb_reset_network_header(skb);
6211 skb_reset_mac_header(skb);
6212
6213 if (local->hw.queues < IEEE80211_NUM_ACS)
6214 goto start_xmit;
6215
6216 /* update QoS header to prioritize control port frames if possible,
6217 * priorization also happens for control port frames send over
6218 * AF_PACKET
6219 */
6220 rcu_read_lock();
6221 err = ieee80211_lookup_ra_sta(sdata, skb, &sta);
6222 if (err) {
6223 dev_kfree_skb(skb);
6224 rcu_read_unlock();
6225 return err;
6226 }
6227
6228 if (!IS_ERR(sta)) {
6229 u16 queue = ieee80211_select_queue(sdata, sta, skb);
6230
6231 skb_set_queue_mapping(skb, queue);
6232
6233 /*
6234 * for MLO STA, the SA should be the AP MLD address, but
6235 * the link ID has been selected already
6236 */
6237 if (sta && sta->sta.mlo)
6238 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
6239 }
6240 rcu_read_unlock();
6241
6242 start_xmit:
6243 local_bh_disable();
6244 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie);
6245 local_bh_enable();
6246
6247 return 0;
6248 }
6249
ieee80211_probe_mesh_link(struct wiphy * wiphy,struct net_device * dev,const u8 * buf,size_t len)6250 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev,
6251 const u8 *buf, size_t len)
6252 {
6253 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
6254 struct ieee80211_local *local = sdata->local;
6255 struct sk_buff *skb;
6256
6257 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len +
6258 30 + /* header size */
6259 18); /* 11s header size */
6260 if (!skb)
6261 return -ENOMEM;
6262
6263 skb_reserve(skb, local->hw.extra_tx_headroom);
6264 skb_put_data(skb, buf, len);
6265
6266 skb->dev = dev;
6267 skb->protocol = htons(ETH_P_802_3);
6268 skb_reset_network_header(skb);
6269 skb_reset_mac_header(skb);
6270
6271 local_bh_disable();
6272 __ieee80211_subif_start_xmit(skb, skb->dev, 0,
6273 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP,
6274 NULL);
6275 local_bh_enable();
6276
6277 return 0;
6278 }
6279