1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright (C) 2018 Intel Corporation
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 *
14 * Transmit and frame generation functions.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/if_vlan.h>
21 #include <linux/etherdevice.h>
22 #include <linux/bitmap.h>
23 #include <linux/rcupdate.h>
24 #include <linux/export.h>
25 #include <net/net_namespace.h>
26 #include <net/ieee80211_radiotap.h>
27 #include <net/cfg80211.h>
28 #include <net/mac80211.h>
29 #include <net/codel.h>
30 #include <net/codel_impl.h>
31 #include <asm/unaligned.h>
32 #include <net/fq_impl.h>
33
34 #include "ieee80211_i.h"
35 #include "driver-ops.h"
36 #include "led.h"
37 #include "mesh.h"
38 #include "wep.h"
39 #include "wpa.h"
40 #include "wme.h"
41 #include "rate.h"
42
43 /* misc utils */
44
45 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
46 {
47 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
48
49 u64_stats_update_begin(&tstats->syncp);
50 tstats->tx_packets++;
51 tstats->tx_bytes += len;
52 u64_stats_update_end(&tstats->syncp);
53 }
54
55 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
56 struct sk_buff *skb, int group_addr,
57 int next_frag_len)
58 {
59 int rate, mrate, erp, dur, i, shift = 0;
60 struct ieee80211_rate *txrate;
61 struct ieee80211_local *local = tx->local;
62 struct ieee80211_supported_band *sband;
63 struct ieee80211_hdr *hdr;
64 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
65 struct ieee80211_chanctx_conf *chanctx_conf;
66 u32 rate_flags = 0;
67
68 /* assume HW handles this */
69 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
70 return 0;
71
72 rcu_read_lock();
73 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
74 if (chanctx_conf) {
75 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
76 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
77 }
78 rcu_read_unlock();
79
80 /* uh huh? */
81 if (WARN_ON_ONCE(tx->rate.idx < 0))
82 return 0;
83
84 sband = local->hw.wiphy->bands[info->band];
85 txrate = &sband->bitrates[tx->rate.idx];
86
87 erp = txrate->flags & IEEE80211_RATE_ERP_G;
88
89 /*
90 * data and mgmt (except PS Poll):
91 * - during CFP: 32768
92 * - during contention period:
93 * if addr1 is group address: 0
94 * if more fragments = 0 and addr1 is individual address: time to
95 * transmit one ACK plus SIFS
96 * if more fragments = 1 and addr1 is individual address: time to
97 * transmit next fragment plus 2 x ACK plus 3 x SIFS
98 *
99 * IEEE 802.11, 9.6:
100 * - control response frame (CTS or ACK) shall be transmitted using the
101 * same rate as the immediately previous frame in the frame exchange
102 * sequence, if this rate belongs to the PHY mandatory rates, or else
103 * at the highest possible rate belonging to the PHY rates in the
104 * BSSBasicRateSet
105 */
106 hdr = (struct ieee80211_hdr *)skb->data;
107 if (ieee80211_is_ctl(hdr->frame_control)) {
108 /* TODO: These control frames are not currently sent by
109 * mac80211, but should they be implemented, this function
110 * needs to be updated to support duration field calculation.
111 *
112 * RTS: time needed to transmit pending data/mgmt frame plus
113 * one CTS frame plus one ACK frame plus 3 x SIFS
114 * CTS: duration of immediately previous RTS minus time
115 * required to transmit CTS and its SIFS
116 * ACK: 0 if immediately previous directed data/mgmt had
117 * more=0, with more=1 duration in ACK frame is duration
118 * from previous frame minus time needed to transmit ACK
119 * and its SIFS
120 * PS Poll: BIT(15) | BIT(14) | aid
121 */
122 return 0;
123 }
124
125 /* data/mgmt */
126 if (0 /* FIX: data/mgmt during CFP */)
127 return cpu_to_le16(32768);
128
129 if (group_addr) /* Group address as the destination - no ACK */
130 return 0;
131
132 /* Individual destination address:
133 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
134 * CTS and ACK frames shall be transmitted using the highest rate in
135 * basic rate set that is less than or equal to the rate of the
136 * immediately previous frame and that is using the same modulation
137 * (CCK or OFDM). If no basic rate set matches with these requirements,
138 * the highest mandatory rate of the PHY that is less than or equal to
139 * the rate of the previous frame is used.
140 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
141 */
142 rate = -1;
143 /* use lowest available if everything fails */
144 mrate = sband->bitrates[0].bitrate;
145 for (i = 0; i < sband->n_bitrates; i++) {
146 struct ieee80211_rate *r = &sband->bitrates[i];
147
148 if (r->bitrate > txrate->bitrate)
149 break;
150
151 if ((rate_flags & r->flags) != rate_flags)
152 continue;
153
154 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
155 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
156
157 switch (sband->band) {
158 case NL80211_BAND_2GHZ: {
159 u32 flag;
160 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
161 flag = IEEE80211_RATE_MANDATORY_G;
162 else
163 flag = IEEE80211_RATE_MANDATORY_B;
164 if (r->flags & flag)
165 mrate = r->bitrate;
166 break;
167 }
168 case NL80211_BAND_5GHZ:
169 if (r->flags & IEEE80211_RATE_MANDATORY_A)
170 mrate = r->bitrate;
171 break;
172 case NL80211_BAND_60GHZ:
173 /* TODO, for now fall through */
174 case NUM_NL80211_BANDS:
175 WARN_ON(1);
176 break;
177 }
178 }
179 if (rate == -1) {
180 /* No matching basic rate found; use highest suitable mandatory
181 * PHY rate */
182 rate = DIV_ROUND_UP(mrate, 1 << shift);
183 }
184
185 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
186 if (ieee80211_is_data_qos(hdr->frame_control) &&
187 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
188 dur = 0;
189 else
190 /* Time needed to transmit ACK
191 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
192 * to closest integer */
193 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
194 tx->sdata->vif.bss_conf.use_short_preamble,
195 shift);
196
197 if (next_frag_len) {
198 /* Frame is fragmented: duration increases with time needed to
199 * transmit next fragment plus ACK and 2 x SIFS. */
200 dur *= 2; /* ACK + SIFS */
201 /* next fragment */
202 dur += ieee80211_frame_duration(sband->band, next_frag_len,
203 txrate->bitrate, erp,
204 tx->sdata->vif.bss_conf.use_short_preamble,
205 shift);
206 }
207
208 return cpu_to_le16(dur);
209 }
210
211 /* tx handlers */
212 static ieee80211_tx_result debug_noinline
213 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
214 {
215 struct ieee80211_local *local = tx->local;
216 struct ieee80211_if_managed *ifmgd;
217
218 /* driver doesn't support power save */
219 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
220 return TX_CONTINUE;
221
222 /* hardware does dynamic power save */
223 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
224 return TX_CONTINUE;
225
226 /* dynamic power save disabled */
227 if (local->hw.conf.dynamic_ps_timeout <= 0)
228 return TX_CONTINUE;
229
230 /* we are scanning, don't enable power save */
231 if (local->scanning)
232 return TX_CONTINUE;
233
234 if (!local->ps_sdata)
235 return TX_CONTINUE;
236
237 /* No point if we're going to suspend */
238 if (local->quiescing)
239 return TX_CONTINUE;
240
241 /* dynamic ps is supported only in managed mode */
242 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
243 return TX_CONTINUE;
244
245 ifmgd = &tx->sdata->u.mgd;
246
247 /*
248 * Don't wakeup from power save if u-apsd is enabled, voip ac has
249 * u-apsd enabled and the frame is in voip class. This effectively
250 * means that even if all access categories have u-apsd enabled, in
251 * practise u-apsd is only used with the voip ac. This is a
252 * workaround for the case when received voip class packets do not
253 * have correct qos tag for some reason, due the network or the
254 * peer application.
255 *
256 * Note: ifmgd->uapsd_queues access is racy here. If the value is
257 * changed via debugfs, user needs to reassociate manually to have
258 * everything in sync.
259 */
260 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
261 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
262 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
263 return TX_CONTINUE;
264
265 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
266 ieee80211_stop_queues_by_reason(&local->hw,
267 IEEE80211_MAX_QUEUE_MAP,
268 IEEE80211_QUEUE_STOP_REASON_PS,
269 false);
270 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
271 ieee80211_queue_work(&local->hw,
272 &local->dynamic_ps_disable_work);
273 }
274
275 /* Don't restart the timer if we're not disassociated */
276 if (!ifmgd->associated)
277 return TX_CONTINUE;
278
279 mod_timer(&local->dynamic_ps_timer, jiffies +
280 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
281
282 return TX_CONTINUE;
283 }
284
285 static ieee80211_tx_result debug_noinline
286 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
287 {
288
289 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
290 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
291 bool assoc = false;
292
293 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
294 return TX_CONTINUE;
295
296 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
297 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
298 !ieee80211_is_probe_req(hdr->frame_control) &&
299 !ieee80211_is_nullfunc(hdr->frame_control))
300 /*
301 * When software scanning only nullfunc frames (to notify
302 * the sleep state to the AP) and probe requests (for the
303 * active scan) are allowed, all other frames should not be
304 * sent and we should not get here, but if we do
305 * nonetheless, drop them to avoid sending them
306 * off-channel. See the link below and
307 * ieee80211_start_scan() for more.
308 *
309 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
310 */
311 return TX_DROP;
312
313 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
314 return TX_CONTINUE;
315
316 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
317 return TX_CONTINUE;
318
319 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
320 return TX_CONTINUE;
321
322 if (tx->sta)
323 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
324
325 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
326 if (unlikely(!assoc &&
327 ieee80211_is_data(hdr->frame_control))) {
328 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
329 sdata_info(tx->sdata,
330 "dropped data frame to not associated station %pM\n",
331 hdr->addr1);
332 #endif
333 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
334 return TX_DROP;
335 }
336 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
337 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
338 /*
339 * No associated STAs - no need to send multicast
340 * frames.
341 */
342 return TX_DROP;
343 }
344
345 return TX_CONTINUE;
346 }
347
348 /* This function is called whenever the AP is about to exceed the maximum limit
349 * of buffered frames for power saving STAs. This situation should not really
350 * happen often during normal operation, so dropping the oldest buffered packet
351 * from each queue should be OK to make some room for new frames. */
352 static void purge_old_ps_buffers(struct ieee80211_local *local)
353 {
354 int total = 0, purged = 0;
355 struct sk_buff *skb;
356 struct ieee80211_sub_if_data *sdata;
357 struct sta_info *sta;
358
359 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
360 struct ps_data *ps;
361
362 if (sdata->vif.type == NL80211_IFTYPE_AP)
363 ps = &sdata->u.ap.ps;
364 else if (ieee80211_vif_is_mesh(&sdata->vif))
365 ps = &sdata->u.mesh.ps;
366 else
367 continue;
368
369 skb = skb_dequeue(&ps->bc_buf);
370 if (skb) {
371 purged++;
372 ieee80211_free_txskb(&local->hw, skb);
373 }
374 total += skb_queue_len(&ps->bc_buf);
375 }
376
377 /*
378 * Drop one frame from each station from the lowest-priority
379 * AC that has frames at all.
380 */
381 list_for_each_entry_rcu(sta, &local->sta_list, list) {
382 int ac;
383
384 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
385 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
386 total += skb_queue_len(&sta->ps_tx_buf[ac]);
387 if (skb) {
388 purged++;
389 ieee80211_free_txskb(&local->hw, skb);
390 break;
391 }
392 }
393 }
394
395 local->total_ps_buffered = total;
396 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
397 }
398
399 static ieee80211_tx_result
400 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
401 {
402 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
403 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
404 struct ps_data *ps;
405
406 /*
407 * broadcast/multicast frame
408 *
409 * If any of the associated/peer stations is in power save mode,
410 * the frame is buffered to be sent after DTIM beacon frame.
411 * This is done either by the hardware or us.
412 */
413
414 /* powersaving STAs currently only in AP/VLAN/mesh mode */
415 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
416 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
417 if (!tx->sdata->bss)
418 return TX_CONTINUE;
419
420 ps = &tx->sdata->bss->ps;
421 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
422 ps = &tx->sdata->u.mesh.ps;
423 } else {
424 return TX_CONTINUE;
425 }
426
427
428 /* no buffering for ordered frames */
429 if (ieee80211_has_order(hdr->frame_control))
430 return TX_CONTINUE;
431
432 if (ieee80211_is_probe_req(hdr->frame_control))
433 return TX_CONTINUE;
434
435 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
436 info->hw_queue = tx->sdata->vif.cab_queue;
437
438 /* no stations in PS mode */
439 if (!atomic_read(&ps->num_sta_ps))
440 return TX_CONTINUE;
441
442 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
443
444 /* device releases frame after DTIM beacon */
445 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
446 return TX_CONTINUE;
447
448 /* buffered in mac80211 */
449 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
450 purge_old_ps_buffers(tx->local);
451
452 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
453 ps_dbg(tx->sdata,
454 "BC TX buffer full - dropping the oldest frame\n");
455 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
456 } else
457 tx->local->total_ps_buffered++;
458
459 skb_queue_tail(&ps->bc_buf, tx->skb);
460
461 return TX_QUEUED;
462 }
463
464 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
465 struct sk_buff *skb)
466 {
467 if (!ieee80211_is_mgmt(fc))
468 return 0;
469
470 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
471 return 0;
472
473 if (!ieee80211_is_robust_mgmt_frame(skb))
474 return 0;
475
476 return 1;
477 }
478
479 static ieee80211_tx_result
480 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
481 {
482 struct sta_info *sta = tx->sta;
483 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
484 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
485 struct ieee80211_local *local = tx->local;
486
487 if (unlikely(!sta))
488 return TX_CONTINUE;
489
490 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
491 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
492 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
493 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
494 int ac = skb_get_queue_mapping(tx->skb);
495
496 if (ieee80211_is_mgmt(hdr->frame_control) &&
497 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
498 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
499 return TX_CONTINUE;
500 }
501
502 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
503 sta->sta.addr, sta->sta.aid, ac);
504 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
505 purge_old_ps_buffers(tx->local);
506
507 /* sync with ieee80211_sta_ps_deliver_wakeup */
508 spin_lock(&sta->ps_lock);
509 /*
510 * STA woke up the meantime and all the frames on ps_tx_buf have
511 * been queued to pending queue. No reordering can happen, go
512 * ahead and Tx the packet.
513 */
514 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
515 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
516 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
517 spin_unlock(&sta->ps_lock);
518 return TX_CONTINUE;
519 }
520
521 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
522 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
523 ps_dbg(tx->sdata,
524 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
525 sta->sta.addr, ac);
526 ieee80211_free_txskb(&local->hw, old);
527 } else
528 tx->local->total_ps_buffered++;
529
530 info->control.jiffies = jiffies;
531 info->control.vif = &tx->sdata->vif;
532 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
533 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
534 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
535 spin_unlock(&sta->ps_lock);
536
537 if (!timer_pending(&local->sta_cleanup))
538 mod_timer(&local->sta_cleanup,
539 round_jiffies(jiffies +
540 STA_INFO_CLEANUP_INTERVAL));
541
542 /*
543 * We queued up some frames, so the TIM bit might
544 * need to be set, recalculate it.
545 */
546 sta_info_recalc_tim(sta);
547
548 return TX_QUEUED;
549 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
550 ps_dbg(tx->sdata,
551 "STA %pM in PS mode, but polling/in SP -> send frame\n",
552 sta->sta.addr);
553 }
554
555 return TX_CONTINUE;
556 }
557
558 static ieee80211_tx_result debug_noinline
559 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
560 {
561 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
562 return TX_CONTINUE;
563
564 if (tx->flags & IEEE80211_TX_UNICAST)
565 return ieee80211_tx_h_unicast_ps_buf(tx);
566 else
567 return ieee80211_tx_h_multicast_ps_buf(tx);
568 }
569
570 static ieee80211_tx_result debug_noinline
571 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
572 {
573 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
574
575 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
576 if (tx->sdata->control_port_no_encrypt)
577 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
578 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
579 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
580 }
581
582 return TX_CONTINUE;
583 }
584
585 static ieee80211_tx_result debug_noinline
586 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
587 {
588 struct ieee80211_key *key;
589 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
590 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
591
592 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
593 tx->key = NULL;
594 else if (tx->sta &&
595 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
596 tx->key = key;
597 else if (ieee80211_is_group_privacy_action(tx->skb) &&
598 (key = rcu_dereference(tx->sdata->default_multicast_key)))
599 tx->key = key;
600 else if (ieee80211_is_mgmt(hdr->frame_control) &&
601 is_multicast_ether_addr(hdr->addr1) &&
602 ieee80211_is_robust_mgmt_frame(tx->skb) &&
603 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
604 tx->key = key;
605 else if (is_multicast_ether_addr(hdr->addr1) &&
606 (key = rcu_dereference(tx->sdata->default_multicast_key)))
607 tx->key = key;
608 else if (!is_multicast_ether_addr(hdr->addr1) &&
609 (key = rcu_dereference(tx->sdata->default_unicast_key)))
610 tx->key = key;
611 else
612 tx->key = NULL;
613
614 if (tx->key) {
615 bool skip_hw = false;
616
617 /* TODO: add threshold stuff again */
618
619 switch (tx->key->conf.cipher) {
620 case WLAN_CIPHER_SUITE_WEP40:
621 case WLAN_CIPHER_SUITE_WEP104:
622 case WLAN_CIPHER_SUITE_TKIP:
623 if (!ieee80211_is_data_present(hdr->frame_control))
624 tx->key = NULL;
625 break;
626 case WLAN_CIPHER_SUITE_CCMP:
627 case WLAN_CIPHER_SUITE_CCMP_256:
628 case WLAN_CIPHER_SUITE_GCMP:
629 case WLAN_CIPHER_SUITE_GCMP_256:
630 if (!ieee80211_is_data_present(hdr->frame_control) &&
631 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
632 tx->skb) &&
633 !ieee80211_is_group_privacy_action(tx->skb))
634 tx->key = NULL;
635 else
636 skip_hw = (tx->key->conf.flags &
637 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
638 ieee80211_is_mgmt(hdr->frame_control);
639 break;
640 case WLAN_CIPHER_SUITE_AES_CMAC:
641 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
643 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
644 if (!ieee80211_is_mgmt(hdr->frame_control))
645 tx->key = NULL;
646 break;
647 }
648
649 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
650 !ieee80211_is_deauth(hdr->frame_control)))
651 return TX_DROP;
652
653 if (!skip_hw && tx->key &&
654 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
655 info->control.hw_key = &tx->key->conf;
656 }
657
658 return TX_CONTINUE;
659 }
660
661 static ieee80211_tx_result debug_noinline
662 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
663 {
664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
665 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
666 struct ieee80211_supported_band *sband;
667 u32 len;
668 struct ieee80211_tx_rate_control txrc;
669 struct ieee80211_sta_rates *ratetbl = NULL;
670 bool assoc = false;
671
672 memset(&txrc, 0, sizeof(txrc));
673
674 sband = tx->local->hw.wiphy->bands[info->band];
675
676 len = min_t(u32, tx->skb->len + FCS_LEN,
677 tx->local->hw.wiphy->frag_threshold);
678
679 /* set up the tx rate control struct we give the RC algo */
680 txrc.hw = &tx->local->hw;
681 txrc.sband = sband;
682 txrc.bss_conf = &tx->sdata->vif.bss_conf;
683 txrc.skb = tx->skb;
684 txrc.reported_rate.idx = -1;
685 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
686
687 if (tx->sdata->rc_has_mcs_mask[info->band])
688 txrc.rate_idx_mcs_mask =
689 tx->sdata->rc_rateidx_mcs_mask[info->band];
690
691 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
692 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
693 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
694 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
695
696 /* set up RTS protection if desired */
697 if (len > tx->local->hw.wiphy->rts_threshold) {
698 txrc.rts = true;
699 }
700
701 info->control.use_rts = txrc.rts;
702 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
703
704 /*
705 * Use short preamble if the BSS can handle it, but not for
706 * management frames unless we know the receiver can handle
707 * that -- the management frame might be to a station that
708 * just wants a probe response.
709 */
710 if (tx->sdata->vif.bss_conf.use_short_preamble &&
711 (ieee80211_is_data(hdr->frame_control) ||
712 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
713 txrc.short_preamble = true;
714
715 info->control.short_preamble = txrc.short_preamble;
716
717 /* don't ask rate control when rate already injected via radiotap */
718 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
719 return TX_CONTINUE;
720
721 if (tx->sta)
722 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
723
724 /*
725 * Lets not bother rate control if we're associated and cannot
726 * talk to the sta. This should not happen.
727 */
728 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
729 !rate_usable_index_exists(sband, &tx->sta->sta),
730 "%s: Dropped data frame as no usable bitrate found while "
731 "scanning and associated. Target station: "
732 "%pM on %d GHz band\n",
733 tx->sdata->name, hdr->addr1,
734 info->band ? 5 : 2))
735 return TX_DROP;
736
737 /*
738 * If we're associated with the sta at this point we know we can at
739 * least send the frame at the lowest bit rate.
740 */
741 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
742
743 if (tx->sta && !info->control.skip_table)
744 ratetbl = rcu_dereference(tx->sta->sta.rates);
745
746 if (unlikely(info->control.rates[0].idx < 0)) {
747 if (ratetbl) {
748 struct ieee80211_tx_rate rate = {
749 .idx = ratetbl->rate[0].idx,
750 .flags = ratetbl->rate[0].flags,
751 .count = ratetbl->rate[0].count
752 };
753
754 if (ratetbl->rate[0].idx < 0)
755 return TX_DROP;
756
757 tx->rate = rate;
758 } else {
759 return TX_DROP;
760 }
761 } else {
762 tx->rate = info->control.rates[0];
763 }
764
765 if (txrc.reported_rate.idx < 0) {
766 txrc.reported_rate = tx->rate;
767 if (tx->sta && ieee80211_is_data(hdr->frame_control))
768 tx->sta->tx_stats.last_rate = txrc.reported_rate;
769 } else if (tx->sta)
770 tx->sta->tx_stats.last_rate = txrc.reported_rate;
771
772 if (ratetbl)
773 return TX_CONTINUE;
774
775 if (unlikely(!info->control.rates[0].count))
776 info->control.rates[0].count = 1;
777
778 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
779 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
780 info->control.rates[0].count = 1;
781
782 return TX_CONTINUE;
783 }
784
785 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
786 {
787 u16 *seq = &sta->tid_seq[tid];
788 __le16 ret = cpu_to_le16(*seq);
789
790 /* Increase the sequence number. */
791 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
792
793 return ret;
794 }
795
796 static ieee80211_tx_result debug_noinline
797 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
798 {
799 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
800 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
801 int tid;
802
803 /*
804 * Packet injection may want to control the sequence
805 * number, if we have no matching interface then we
806 * neither assign one ourselves nor ask the driver to.
807 */
808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
809 return TX_CONTINUE;
810
811 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
812 return TX_CONTINUE;
813
814 if (ieee80211_hdrlen(hdr->frame_control) < 24)
815 return TX_CONTINUE;
816
817 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
818 return TX_CONTINUE;
819
820 /*
821 * Anything but QoS data that has a sequence number field
822 * (is long enough) gets a sequence number from the global
823 * counter. QoS data frames with a multicast destination
824 * also use the global counter (802.11-2012 9.3.2.10).
825 */
826 if (!ieee80211_is_data_qos(hdr->frame_control) ||
827 is_multicast_ether_addr(hdr->addr1)) {
828 /* driver should assign sequence number */
829 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
830 /* for pure STA mode without beacons, we can do it */
831 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
832 tx->sdata->sequence_number += 0x10;
833 if (tx->sta)
834 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
835 return TX_CONTINUE;
836 }
837
838 /*
839 * This should be true for injected/management frames only, for
840 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
841 * above since they are not QoS-data frames.
842 */
843 if (!tx->sta)
844 return TX_CONTINUE;
845
846 /* include per-STA, per-TID sequence counter */
847 tid = ieee80211_get_tid(hdr);
848 tx->sta->tx_stats.msdu[tid]++;
849
850 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
851
852 return TX_CONTINUE;
853 }
854
855 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
856 struct sk_buff *skb, int hdrlen,
857 int frag_threshold)
858 {
859 struct ieee80211_local *local = tx->local;
860 struct ieee80211_tx_info *info;
861 struct sk_buff *tmp;
862 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
863 int pos = hdrlen + per_fragm;
864 int rem = skb->len - hdrlen - per_fragm;
865
866 if (WARN_ON(rem < 0))
867 return -EINVAL;
868
869 /* first fragment was already added to queue by caller */
870
871 while (rem) {
872 int fraglen = per_fragm;
873
874 if (fraglen > rem)
875 fraglen = rem;
876 rem -= fraglen;
877 tmp = dev_alloc_skb(local->tx_headroom +
878 frag_threshold +
879 tx->sdata->encrypt_headroom +
880 IEEE80211_ENCRYPT_TAILROOM);
881 if (!tmp)
882 return -ENOMEM;
883
884 __skb_queue_tail(&tx->skbs, tmp);
885
886 skb_reserve(tmp,
887 local->tx_headroom + tx->sdata->encrypt_headroom);
888
889 /* copy control information */
890 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
891
892 info = IEEE80211_SKB_CB(tmp);
893 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
894 IEEE80211_TX_CTL_FIRST_FRAGMENT);
895
896 if (rem)
897 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
898
899 skb_copy_queue_mapping(tmp, skb);
900 tmp->priority = skb->priority;
901 tmp->dev = skb->dev;
902
903 /* copy header and data */
904 skb_put_data(tmp, skb->data, hdrlen);
905 skb_put_data(tmp, skb->data + pos, fraglen);
906
907 pos += fraglen;
908 }
909
910 /* adjust first fragment's length */
911 skb_trim(skb, hdrlen + per_fragm);
912 return 0;
913 }
914
915 static ieee80211_tx_result debug_noinline
916 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
917 {
918 struct sk_buff *skb = tx->skb;
919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
920 struct ieee80211_hdr *hdr = (void *)skb->data;
921 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
922 int hdrlen;
923 int fragnum;
924
925 /* no matter what happens, tx->skb moves to tx->skbs */
926 __skb_queue_tail(&tx->skbs, skb);
927 tx->skb = NULL;
928
929 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
930 return TX_CONTINUE;
931
932 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
933 return TX_CONTINUE;
934
935 /*
936 * Warn when submitting a fragmented A-MPDU frame and drop it.
937 * This scenario is handled in ieee80211_tx_prepare but extra
938 * caution taken here as fragmented ampdu may cause Tx stop.
939 */
940 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
941 return TX_DROP;
942
943 hdrlen = ieee80211_hdrlen(hdr->frame_control);
944
945 /* internal error, why isn't DONTFRAG set? */
946 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
947 return TX_DROP;
948
949 /*
950 * Now fragment the frame. This will allocate all the fragments and
951 * chain them (using skb as the first fragment) to skb->next.
952 * During transmission, we will remove the successfully transmitted
953 * fragments from this list. When the low-level driver rejects one
954 * of the fragments then we will simply pretend to accept the skb
955 * but store it away as pending.
956 */
957 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
958 return TX_DROP;
959
960 /* update duration/seq/flags of fragments */
961 fragnum = 0;
962
963 skb_queue_walk(&tx->skbs, skb) {
964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
965
966 hdr = (void *)skb->data;
967 info = IEEE80211_SKB_CB(skb);
968
969 if (!skb_queue_is_last(&tx->skbs, skb)) {
970 hdr->frame_control |= morefrags;
971 /*
972 * No multi-rate retries for fragmented frames, that
973 * would completely throw off the NAV at other STAs.
974 */
975 info->control.rates[1].idx = -1;
976 info->control.rates[2].idx = -1;
977 info->control.rates[3].idx = -1;
978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
980 } else {
981 hdr->frame_control &= ~morefrags;
982 }
983 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
984 fragnum++;
985 }
986
987 return TX_CONTINUE;
988 }
989
990 static ieee80211_tx_result debug_noinline
991 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
992 {
993 struct sk_buff *skb;
994 int ac = -1;
995
996 if (!tx->sta)
997 return TX_CONTINUE;
998
999 skb_queue_walk(&tx->skbs, skb) {
1000 ac = skb_get_queue_mapping(skb);
1001 tx->sta->tx_stats.bytes[ac] += skb->len;
1002 }
1003 if (ac >= 0)
1004 tx->sta->tx_stats.packets[ac]++;
1005
1006 return TX_CONTINUE;
1007 }
1008
1009 static ieee80211_tx_result debug_noinline
1010 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1011 {
1012 if (!tx->key)
1013 return TX_CONTINUE;
1014
1015 switch (tx->key->conf.cipher) {
1016 case WLAN_CIPHER_SUITE_WEP40:
1017 case WLAN_CIPHER_SUITE_WEP104:
1018 return ieee80211_crypto_wep_encrypt(tx);
1019 case WLAN_CIPHER_SUITE_TKIP:
1020 return ieee80211_crypto_tkip_encrypt(tx);
1021 case WLAN_CIPHER_SUITE_CCMP:
1022 return ieee80211_crypto_ccmp_encrypt(
1023 tx, IEEE80211_CCMP_MIC_LEN);
1024 case WLAN_CIPHER_SUITE_CCMP_256:
1025 return ieee80211_crypto_ccmp_encrypt(
1026 tx, IEEE80211_CCMP_256_MIC_LEN);
1027 case WLAN_CIPHER_SUITE_AES_CMAC:
1028 return ieee80211_crypto_aes_cmac_encrypt(tx);
1029 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1030 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1031 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1032 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1033 return ieee80211_crypto_aes_gmac_encrypt(tx);
1034 case WLAN_CIPHER_SUITE_GCMP:
1035 case WLAN_CIPHER_SUITE_GCMP_256:
1036 return ieee80211_crypto_gcmp_encrypt(tx);
1037 default:
1038 return ieee80211_crypto_hw_encrypt(tx);
1039 }
1040
1041 return TX_DROP;
1042 }
1043
1044 static ieee80211_tx_result debug_noinline
1045 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1046 {
1047 struct sk_buff *skb;
1048 struct ieee80211_hdr *hdr;
1049 int next_len;
1050 bool group_addr;
1051
1052 skb_queue_walk(&tx->skbs, skb) {
1053 hdr = (void *) skb->data;
1054 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1055 break; /* must not overwrite AID */
1056 if (!skb_queue_is_last(&tx->skbs, skb)) {
1057 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1058 next_len = next->len;
1059 } else
1060 next_len = 0;
1061 group_addr = is_multicast_ether_addr(hdr->addr1);
1062
1063 hdr->duration_id =
1064 ieee80211_duration(tx, skb, group_addr, next_len);
1065 }
1066
1067 return TX_CONTINUE;
1068 }
1069
1070 /* actual transmit path */
1071
1072 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1073 struct sk_buff *skb,
1074 struct ieee80211_tx_info *info,
1075 struct tid_ampdu_tx *tid_tx,
1076 int tid)
1077 {
1078 bool queued = false;
1079 bool reset_agg_timer = false;
1080 struct sk_buff *purge_skb = NULL;
1081
1082 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1083 info->flags |= IEEE80211_TX_CTL_AMPDU;
1084 reset_agg_timer = true;
1085 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1086 /*
1087 * nothing -- this aggregation session is being started
1088 * but that might still fail with the driver
1089 */
1090 } else if (!tx->sta->sta.txq[tid]) {
1091 spin_lock(&tx->sta->lock);
1092 /*
1093 * Need to re-check now, because we may get here
1094 *
1095 * 1) in the window during which the setup is actually
1096 * already done, but not marked yet because not all
1097 * packets are spliced over to the driver pending
1098 * queue yet -- if this happened we acquire the lock
1099 * either before or after the splice happens, but
1100 * need to recheck which of these cases happened.
1101 *
1102 * 2) during session teardown, if the OPERATIONAL bit
1103 * was cleared due to the teardown but the pointer
1104 * hasn't been assigned NULL yet (or we loaded it
1105 * before it was assigned) -- in this case it may
1106 * now be NULL which means we should just let the
1107 * packet pass through because splicing the frames
1108 * back is already done.
1109 */
1110 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1111
1112 if (!tid_tx) {
1113 /* do nothing, let packet pass through */
1114 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1115 info->flags |= IEEE80211_TX_CTL_AMPDU;
1116 reset_agg_timer = true;
1117 } else {
1118 queued = true;
1119 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1120 clear_sta_flag(tx->sta, WLAN_STA_SP);
1121 ps_dbg(tx->sta->sdata,
1122 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1123 tx->sta->sta.addr, tx->sta->sta.aid);
1124 }
1125 info->control.vif = &tx->sdata->vif;
1126 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1127 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1128 __skb_queue_tail(&tid_tx->pending, skb);
1129 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1130 purge_skb = __skb_dequeue(&tid_tx->pending);
1131 }
1132 spin_unlock(&tx->sta->lock);
1133
1134 if (purge_skb)
1135 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1136 }
1137
1138 /* reset session timer */
1139 if (reset_agg_timer)
1140 tid_tx->last_tx = jiffies;
1141
1142 return queued;
1143 }
1144
1145 /*
1146 * initialises @tx
1147 * pass %NULL for the station if unknown, a valid pointer if known
1148 * or an ERR_PTR() if the station is known not to exist
1149 */
1150 static ieee80211_tx_result
1151 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1152 struct ieee80211_tx_data *tx,
1153 struct sta_info *sta, struct sk_buff *skb)
1154 {
1155 struct ieee80211_local *local = sdata->local;
1156 struct ieee80211_hdr *hdr;
1157 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1158 int tid;
1159
1160 memset(tx, 0, sizeof(*tx));
1161 tx->skb = skb;
1162 tx->local = local;
1163 tx->sdata = sdata;
1164 __skb_queue_head_init(&tx->skbs);
1165
1166 /*
1167 * If this flag is set to true anywhere, and we get here,
1168 * we are doing the needed processing, so remove the flag
1169 * now.
1170 */
1171 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1172
1173 hdr = (struct ieee80211_hdr *) skb->data;
1174
1175 if (likely(sta)) {
1176 if (!IS_ERR(sta))
1177 tx->sta = sta;
1178 } else {
1179 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1180 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1181 if (!tx->sta && sdata->wdev.use_4addr)
1182 return TX_DROP;
1183 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1184 IEEE80211_TX_CTL_INJECTED) ||
1185 tx->sdata->control_port_protocol == tx->skb->protocol) {
1186 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1187 }
1188 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1189 tx->sta = sta_info_get(sdata, hdr->addr1);
1190 }
1191
1192 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1193 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1194 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1195 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1196 struct tid_ampdu_tx *tid_tx;
1197
1198 tid = ieee80211_get_tid(hdr);
1199
1200 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1201 if (tid_tx) {
1202 bool queued;
1203
1204 queued = ieee80211_tx_prep_agg(tx, skb, info,
1205 tid_tx, tid);
1206
1207 if (unlikely(queued))
1208 return TX_QUEUED;
1209 }
1210 }
1211
1212 if (is_multicast_ether_addr(hdr->addr1)) {
1213 tx->flags &= ~IEEE80211_TX_UNICAST;
1214 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1215 } else
1216 tx->flags |= IEEE80211_TX_UNICAST;
1217
1218 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1219 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1220 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1221 info->flags & IEEE80211_TX_CTL_AMPDU)
1222 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1223 }
1224
1225 if (!tx->sta)
1226 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1227 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1228 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1229 ieee80211_check_fast_xmit(tx->sta);
1230 }
1231
1232 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1233
1234 return TX_CONTINUE;
1235 }
1236
1237 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1238 struct ieee80211_vif *vif,
1239 struct sta_info *sta,
1240 struct sk_buff *skb)
1241 {
1242 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1243 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1244 struct ieee80211_txq *txq = NULL;
1245
1246 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1247 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1248 return NULL;
1249
1250 if (!ieee80211_is_data(hdr->frame_control))
1251 return NULL;
1252
1253 if (sta) {
1254 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1255
1256 if (!sta->uploaded)
1257 return NULL;
1258
1259 txq = sta->sta.txq[tid];
1260 } else if (vif) {
1261 txq = vif->txq;
1262 }
1263
1264 if (!txq)
1265 return NULL;
1266
1267 return to_txq_info(txq);
1268 }
1269
1270 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1271 {
1272 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1273 }
1274
1275 static u32 codel_skb_len_func(const struct sk_buff *skb)
1276 {
1277 return skb->len;
1278 }
1279
1280 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1281 {
1282 const struct ieee80211_tx_info *info;
1283
1284 info = (const struct ieee80211_tx_info *)skb->cb;
1285 return info->control.enqueue_time;
1286 }
1287
1288 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1289 void *ctx)
1290 {
1291 struct ieee80211_local *local;
1292 struct txq_info *txqi;
1293 struct fq *fq;
1294 struct fq_flow *flow;
1295
1296 txqi = ctx;
1297 local = vif_to_sdata(txqi->txq.vif)->local;
1298 fq = &local->fq;
1299
1300 if (cvars == &txqi->def_cvars)
1301 flow = &txqi->def_flow;
1302 else
1303 flow = &fq->flows[cvars - local->cvars];
1304
1305 return fq_flow_dequeue(fq, flow);
1306 }
1307
1308 static void codel_drop_func(struct sk_buff *skb,
1309 void *ctx)
1310 {
1311 struct ieee80211_local *local;
1312 struct ieee80211_hw *hw;
1313 struct txq_info *txqi;
1314
1315 txqi = ctx;
1316 local = vif_to_sdata(txqi->txq.vif)->local;
1317 hw = &local->hw;
1318
1319 ieee80211_free_txskb(hw, skb);
1320 }
1321
1322 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1323 struct fq_tin *tin,
1324 struct fq_flow *flow)
1325 {
1326 struct ieee80211_local *local;
1327 struct txq_info *txqi;
1328 struct codel_vars *cvars;
1329 struct codel_params *cparams;
1330 struct codel_stats *cstats;
1331
1332 local = container_of(fq, struct ieee80211_local, fq);
1333 txqi = container_of(tin, struct txq_info, tin);
1334 cstats = &txqi->cstats;
1335
1336 if (txqi->txq.sta) {
1337 struct sta_info *sta = container_of(txqi->txq.sta,
1338 struct sta_info, sta);
1339 cparams = &sta->cparams;
1340 } else {
1341 cparams = &local->cparams;
1342 }
1343
1344 if (flow == &txqi->def_flow)
1345 cvars = &txqi->def_cvars;
1346 else
1347 cvars = &local->cvars[flow - fq->flows];
1348
1349 return codel_dequeue(txqi,
1350 &flow->backlog,
1351 cparams,
1352 cvars,
1353 cstats,
1354 codel_skb_len_func,
1355 codel_skb_time_func,
1356 codel_drop_func,
1357 codel_dequeue_func);
1358 }
1359
1360 static void fq_skb_free_func(struct fq *fq,
1361 struct fq_tin *tin,
1362 struct fq_flow *flow,
1363 struct sk_buff *skb)
1364 {
1365 struct ieee80211_local *local;
1366
1367 local = container_of(fq, struct ieee80211_local, fq);
1368 ieee80211_free_txskb(&local->hw, skb);
1369 }
1370
1371 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1372 struct fq_tin *tin,
1373 int idx,
1374 struct sk_buff *skb)
1375 {
1376 struct txq_info *txqi;
1377
1378 txqi = container_of(tin, struct txq_info, tin);
1379 return &txqi->def_flow;
1380 }
1381
1382 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1383 struct txq_info *txqi,
1384 struct sk_buff *skb)
1385 {
1386 struct fq *fq = &local->fq;
1387 struct fq_tin *tin = &txqi->tin;
1388
1389 ieee80211_set_skb_enqueue_time(skb);
1390 fq_tin_enqueue(fq, tin, skb,
1391 fq_skb_free_func,
1392 fq_flow_get_default_func);
1393 }
1394
1395 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1396 struct fq_flow *flow, struct sk_buff *skb,
1397 void *data)
1398 {
1399 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1400
1401 return info->control.vif == data;
1402 }
1403
1404 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1405 struct ieee80211_sub_if_data *sdata)
1406 {
1407 struct fq *fq = &local->fq;
1408 struct txq_info *txqi;
1409 struct fq_tin *tin;
1410 struct ieee80211_sub_if_data *ap;
1411
1412 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1413 return;
1414
1415 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1416
1417 if (!ap->vif.txq)
1418 return;
1419
1420 txqi = to_txq_info(ap->vif.txq);
1421 tin = &txqi->tin;
1422
1423 spin_lock_bh(&fq->lock);
1424 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1425 fq_skb_free_func);
1426 spin_unlock_bh(&fq->lock);
1427 }
1428
1429 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1430 struct sta_info *sta,
1431 struct txq_info *txqi, int tid)
1432 {
1433 fq_tin_init(&txqi->tin);
1434 fq_flow_init(&txqi->def_flow);
1435 codel_vars_init(&txqi->def_cvars);
1436 codel_stats_init(&txqi->cstats);
1437 __skb_queue_head_init(&txqi->frags);
1438
1439 txqi->txq.vif = &sdata->vif;
1440
1441 if (sta) {
1442 txqi->txq.sta = &sta->sta;
1443 sta->sta.txq[tid] = &txqi->txq;
1444 txqi->txq.tid = tid;
1445 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1446 } else {
1447 sdata->vif.txq = &txqi->txq;
1448 txqi->txq.tid = 0;
1449 txqi->txq.ac = IEEE80211_AC_BE;
1450 }
1451 }
1452
1453 void ieee80211_txq_purge(struct ieee80211_local *local,
1454 struct txq_info *txqi)
1455 {
1456 struct fq *fq = &local->fq;
1457 struct fq_tin *tin = &txqi->tin;
1458
1459 fq_tin_reset(fq, tin, fq_skb_free_func);
1460 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1461 }
1462
1463 void ieee80211_txq_set_params(struct ieee80211_local *local)
1464 {
1465 if (local->hw.wiphy->txq_limit)
1466 local->fq.limit = local->hw.wiphy->txq_limit;
1467 else
1468 local->hw.wiphy->txq_limit = local->fq.limit;
1469
1470 if (local->hw.wiphy->txq_memory_limit)
1471 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1472 else
1473 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1474
1475 if (local->hw.wiphy->txq_quantum)
1476 local->fq.quantum = local->hw.wiphy->txq_quantum;
1477 else
1478 local->hw.wiphy->txq_quantum = local->fq.quantum;
1479 }
1480
1481 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1482 {
1483 struct fq *fq = &local->fq;
1484 int ret;
1485 int i;
1486 bool supp_vht = false;
1487 enum nl80211_band band;
1488
1489 if (!local->ops->wake_tx_queue)
1490 return 0;
1491
1492 ret = fq_init(fq, 4096);
1493 if (ret)
1494 return ret;
1495
1496 /*
1497 * If the hardware doesn't support VHT, it is safe to limit the maximum
1498 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1499 */
1500 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1501 struct ieee80211_supported_band *sband;
1502
1503 sband = local->hw.wiphy->bands[band];
1504 if (!sband)
1505 continue;
1506
1507 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1508 }
1509
1510 if (!supp_vht)
1511 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1512
1513 codel_params_init(&local->cparams);
1514 local->cparams.interval = MS2TIME(100);
1515 local->cparams.target = MS2TIME(20);
1516 local->cparams.ecn = true;
1517
1518 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1519 GFP_KERNEL);
1520 if (!local->cvars) {
1521 spin_lock_bh(&fq->lock);
1522 fq_reset(fq, fq_skb_free_func);
1523 spin_unlock_bh(&fq->lock);
1524 return -ENOMEM;
1525 }
1526
1527 for (i = 0; i < fq->flows_cnt; i++)
1528 codel_vars_init(&local->cvars[i]);
1529
1530 ieee80211_txq_set_params(local);
1531
1532 return 0;
1533 }
1534
1535 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1536 {
1537 struct fq *fq = &local->fq;
1538
1539 if (!local->ops->wake_tx_queue)
1540 return;
1541
1542 kfree(local->cvars);
1543 local->cvars = NULL;
1544
1545 spin_lock_bh(&fq->lock);
1546 fq_reset(fq, fq_skb_free_func);
1547 spin_unlock_bh(&fq->lock);
1548 }
1549
1550 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1551 struct ieee80211_sub_if_data *sdata,
1552 struct sta_info *sta,
1553 struct sk_buff *skb)
1554 {
1555 struct fq *fq = &local->fq;
1556 struct ieee80211_vif *vif;
1557 struct txq_info *txqi;
1558
1559 if (!local->ops->wake_tx_queue ||
1560 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1561 return false;
1562
1563 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1564 sdata = container_of(sdata->bss,
1565 struct ieee80211_sub_if_data, u.ap);
1566
1567 vif = &sdata->vif;
1568 txqi = ieee80211_get_txq(local, vif, sta, skb);
1569
1570 if (!txqi)
1571 return false;
1572
1573 spin_lock_bh(&fq->lock);
1574 ieee80211_txq_enqueue(local, txqi, skb);
1575 spin_unlock_bh(&fq->lock);
1576
1577 drv_wake_tx_queue(local, txqi);
1578
1579 return true;
1580 }
1581
1582 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1583 struct ieee80211_vif *vif,
1584 struct ieee80211_sta *sta,
1585 struct sk_buff_head *skbs,
1586 bool txpending)
1587 {
1588 struct ieee80211_tx_control control = {};
1589 struct sk_buff *skb, *tmp;
1590 unsigned long flags;
1591
1592 skb_queue_walk_safe(skbs, skb, tmp) {
1593 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1594 int q = info->hw_queue;
1595
1596 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1597 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1598 __skb_unlink(skb, skbs);
1599 ieee80211_free_txskb(&local->hw, skb);
1600 continue;
1601 }
1602 #endif
1603
1604 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1605 if (local->queue_stop_reasons[q] ||
1606 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1607 if (unlikely(info->flags &
1608 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1609 if (local->queue_stop_reasons[q] &
1610 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1611 /*
1612 * Drop off-channel frames if queues
1613 * are stopped for any reason other
1614 * than off-channel operation. Never
1615 * queue them.
1616 */
1617 spin_unlock_irqrestore(
1618 &local->queue_stop_reason_lock,
1619 flags);
1620 ieee80211_purge_tx_queue(&local->hw,
1621 skbs);
1622 return true;
1623 }
1624 } else {
1625
1626 /*
1627 * Since queue is stopped, queue up frames for
1628 * later transmission from the tx-pending
1629 * tasklet when the queue is woken again.
1630 */
1631 if (txpending)
1632 skb_queue_splice_init(skbs,
1633 &local->pending[q]);
1634 else
1635 skb_queue_splice_tail_init(skbs,
1636 &local->pending[q]);
1637
1638 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1639 flags);
1640 return false;
1641 }
1642 }
1643 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1644
1645 info->control.vif = vif;
1646 control.sta = sta;
1647
1648 __skb_unlink(skb, skbs);
1649 drv_tx(local, &control, skb);
1650 }
1651
1652 return true;
1653 }
1654
1655 /*
1656 * Returns false if the frame couldn't be transmitted but was queued instead.
1657 */
1658 static bool __ieee80211_tx(struct ieee80211_local *local,
1659 struct sk_buff_head *skbs, int led_len,
1660 struct sta_info *sta, bool txpending)
1661 {
1662 struct ieee80211_tx_info *info;
1663 struct ieee80211_sub_if_data *sdata;
1664 struct ieee80211_vif *vif;
1665 struct ieee80211_sta *pubsta;
1666 struct sk_buff *skb;
1667 bool result = true;
1668 __le16 fc;
1669
1670 if (WARN_ON(skb_queue_empty(skbs)))
1671 return true;
1672
1673 skb = skb_peek(skbs);
1674 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1675 info = IEEE80211_SKB_CB(skb);
1676 sdata = vif_to_sdata(info->control.vif);
1677 if (sta && !sta->uploaded)
1678 sta = NULL;
1679
1680 if (sta)
1681 pubsta = &sta->sta;
1682 else
1683 pubsta = NULL;
1684
1685 switch (sdata->vif.type) {
1686 case NL80211_IFTYPE_MONITOR:
1687 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1688 vif = &sdata->vif;
1689 break;
1690 }
1691 sdata = rcu_dereference(local->monitor_sdata);
1692 if (sdata) {
1693 vif = &sdata->vif;
1694 info->hw_queue =
1695 vif->hw_queue[skb_get_queue_mapping(skb)];
1696 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1697 ieee80211_purge_tx_queue(&local->hw, skbs);
1698 return true;
1699 } else
1700 vif = NULL;
1701 break;
1702 case NL80211_IFTYPE_AP_VLAN:
1703 sdata = container_of(sdata->bss,
1704 struct ieee80211_sub_if_data, u.ap);
1705 /* fall through */
1706 default:
1707 vif = &sdata->vif;
1708 break;
1709 }
1710
1711 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1712 txpending);
1713
1714 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1715
1716 WARN_ON_ONCE(!skb_queue_empty(skbs));
1717
1718 return result;
1719 }
1720
1721 /*
1722 * Invoke TX handlers, return 0 on success and non-zero if the
1723 * frame was dropped or queued.
1724 *
1725 * The handlers are split into an early and late part. The latter is everything
1726 * that can be sensitive to reordering, and will be deferred to after packets
1727 * are dequeued from the intermediate queues (when they are enabled).
1728 */
1729 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1730 {
1731 ieee80211_tx_result res = TX_DROP;
1732
1733 #define CALL_TXH(txh) \
1734 do { \
1735 res = txh(tx); \
1736 if (res != TX_CONTINUE) \
1737 goto txh_done; \
1738 } while (0)
1739
1740 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1741 CALL_TXH(ieee80211_tx_h_check_assoc);
1742 CALL_TXH(ieee80211_tx_h_ps_buf);
1743 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1744 CALL_TXH(ieee80211_tx_h_select_key);
1745 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1746 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1747
1748 txh_done:
1749 if (unlikely(res == TX_DROP)) {
1750 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1751 if (tx->skb)
1752 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1753 else
1754 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1755 return -1;
1756 } else if (unlikely(res == TX_QUEUED)) {
1757 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1758 return -1;
1759 }
1760
1761 return 0;
1762 }
1763
1764 /*
1765 * Late handlers can be called while the sta lock is held. Handlers that can
1766 * cause packets to be generated will cause deadlock!
1767 */
1768 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1769 {
1770 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1771 ieee80211_tx_result res = TX_CONTINUE;
1772
1773 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1774 __skb_queue_tail(&tx->skbs, tx->skb);
1775 tx->skb = NULL;
1776 goto txh_done;
1777 }
1778
1779 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1780 CALL_TXH(ieee80211_tx_h_sequence);
1781 CALL_TXH(ieee80211_tx_h_fragment);
1782 /* handlers after fragment must be aware of tx info fragmentation! */
1783 CALL_TXH(ieee80211_tx_h_stats);
1784 CALL_TXH(ieee80211_tx_h_encrypt);
1785 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1786 CALL_TXH(ieee80211_tx_h_calculate_duration);
1787 #undef CALL_TXH
1788
1789 txh_done:
1790 if (unlikely(res == TX_DROP)) {
1791 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1792 if (tx->skb)
1793 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1794 else
1795 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1796 return -1;
1797 } else if (unlikely(res == TX_QUEUED)) {
1798 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1799 return -1;
1800 }
1801
1802 return 0;
1803 }
1804
1805 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1806 {
1807 int r = invoke_tx_handlers_early(tx);
1808
1809 if (r)
1810 return r;
1811 return invoke_tx_handlers_late(tx);
1812 }
1813
1814 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1815 struct ieee80211_vif *vif, struct sk_buff *skb,
1816 int band, struct ieee80211_sta **sta)
1817 {
1818 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1819 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1820 struct ieee80211_tx_data tx;
1821 struct sk_buff *skb2;
1822
1823 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1824 return false;
1825
1826 info->band = band;
1827 info->control.vif = vif;
1828 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1829
1830 if (invoke_tx_handlers(&tx))
1831 return false;
1832
1833 if (sta) {
1834 if (tx.sta)
1835 *sta = &tx.sta->sta;
1836 else
1837 *sta = NULL;
1838 }
1839
1840 /* this function isn't suitable for fragmented data frames */
1841 skb2 = __skb_dequeue(&tx.skbs);
1842 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1843 ieee80211_free_txskb(hw, skb2);
1844 ieee80211_purge_tx_queue(hw, &tx.skbs);
1845 return false;
1846 }
1847
1848 return true;
1849 }
1850 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1851
1852 /*
1853 * Returns false if the frame couldn't be transmitted but was queued instead.
1854 */
1855 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1856 struct sta_info *sta, struct sk_buff *skb,
1857 bool txpending)
1858 {
1859 struct ieee80211_local *local = sdata->local;
1860 struct ieee80211_tx_data tx;
1861 ieee80211_tx_result res_prepare;
1862 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1863 bool result = true;
1864 int led_len;
1865
1866 if (unlikely(skb->len < 10)) {
1867 dev_kfree_skb(skb);
1868 return true;
1869 }
1870
1871 /* initialises tx */
1872 led_len = skb->len;
1873 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1874
1875 if (unlikely(res_prepare == TX_DROP)) {
1876 ieee80211_free_txskb(&local->hw, skb);
1877 return true;
1878 } else if (unlikely(res_prepare == TX_QUEUED)) {
1879 return true;
1880 }
1881
1882 /* set up hw_queue value early */
1883 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1884 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1885 info->hw_queue =
1886 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1887
1888 if (invoke_tx_handlers_early(&tx))
1889 return true;
1890
1891 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1892 return true;
1893
1894 if (!invoke_tx_handlers_late(&tx))
1895 result = __ieee80211_tx(local, &tx.skbs, led_len,
1896 tx.sta, txpending);
1897
1898 return result;
1899 }
1900
1901 /* device xmit handlers */
1902
1903 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1904 struct sk_buff *skb,
1905 int head_need, bool may_encrypt)
1906 {
1907 struct ieee80211_local *local = sdata->local;
1908 int tail_need = 0;
1909
1910 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1911 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1912 tail_need -= skb_tailroom(skb);
1913 tail_need = max_t(int, tail_need, 0);
1914 }
1915
1916 if (skb_cloned(skb) &&
1917 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1918 !skb_clone_writable(skb, ETH_HLEN) ||
1919 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1920 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1921 else if (head_need || tail_need)
1922 I802_DEBUG_INC(local->tx_expand_skb_head);
1923 else
1924 return 0;
1925
1926 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1927 wiphy_debug(local->hw.wiphy,
1928 "failed to reallocate TX buffer\n");
1929 return -ENOMEM;
1930 }
1931
1932 return 0;
1933 }
1934
1935 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1936 struct sta_info *sta, struct sk_buff *skb)
1937 {
1938 struct ieee80211_local *local = sdata->local;
1939 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1940 struct ieee80211_hdr *hdr;
1941 int headroom;
1942 bool may_encrypt;
1943
1944 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1945
1946 headroom = local->tx_headroom;
1947 if (may_encrypt)
1948 headroom += sdata->encrypt_headroom;
1949 headroom -= skb_headroom(skb);
1950 headroom = max_t(int, 0, headroom);
1951
1952 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1953 ieee80211_free_txskb(&local->hw, skb);
1954 return;
1955 }
1956
1957 hdr = (struct ieee80211_hdr *) skb->data;
1958 info->control.vif = &sdata->vif;
1959
1960 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1961 if (ieee80211_is_data(hdr->frame_control) &&
1962 is_unicast_ether_addr(hdr->addr1)) {
1963 if (mesh_nexthop_resolve(sdata, skb))
1964 return; /* skb queued: don't free */
1965 } else {
1966 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1967 }
1968 }
1969
1970 ieee80211_set_qos_hdr(sdata, skb);
1971 ieee80211_tx(sdata, sta, skb, false);
1972 }
1973
1974 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1975 struct sk_buff *skb)
1976 {
1977 struct ieee80211_radiotap_iterator iterator;
1978 struct ieee80211_radiotap_header *rthdr =
1979 (struct ieee80211_radiotap_header *) skb->data;
1980 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1981 struct ieee80211_supported_band *sband =
1982 local->hw.wiphy->bands[info->band];
1983 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1984 NULL);
1985 u16 txflags;
1986 u16 rate = 0;
1987 bool rate_found = false;
1988 u8 rate_retries = 0;
1989 u16 rate_flags = 0;
1990 u8 mcs_known, mcs_flags, mcs_bw;
1991 u16 vht_known;
1992 u8 vht_mcs = 0, vht_nss = 0;
1993 int i;
1994
1995 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1996 IEEE80211_TX_CTL_DONTFRAG;
1997
1998 /*
1999 * for every radiotap entry that is present
2000 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2001 * entries present, or -EINVAL on error)
2002 */
2003
2004 while (!ret) {
2005 ret = ieee80211_radiotap_iterator_next(&iterator);
2006
2007 if (ret)
2008 continue;
2009
2010 /* see if this argument is something we can use */
2011 switch (iterator.this_arg_index) {
2012 /*
2013 * You must take care when dereferencing iterator.this_arg
2014 * for multibyte types... the pointer is not aligned. Use
2015 * get_unaligned((type *)iterator.this_arg) to dereference
2016 * iterator.this_arg for type "type" safely on all arches.
2017 */
2018 case IEEE80211_RADIOTAP_FLAGS:
2019 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2020 /*
2021 * this indicates that the skb we have been
2022 * handed has the 32-bit FCS CRC at the end...
2023 * we should react to that by snipping it off
2024 * because it will be recomputed and added
2025 * on transmission
2026 */
2027 if (skb->len < (iterator._max_length + FCS_LEN))
2028 return false;
2029
2030 skb_trim(skb, skb->len - FCS_LEN);
2031 }
2032 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2033 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2034 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2035 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2036 break;
2037
2038 case IEEE80211_RADIOTAP_TX_FLAGS:
2039 txflags = get_unaligned_le16(iterator.this_arg);
2040 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2041 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2042 break;
2043
2044 case IEEE80211_RADIOTAP_RATE:
2045 rate = *iterator.this_arg;
2046 rate_flags = 0;
2047 rate_found = true;
2048 break;
2049
2050 case IEEE80211_RADIOTAP_DATA_RETRIES:
2051 rate_retries = *iterator.this_arg;
2052 break;
2053
2054 case IEEE80211_RADIOTAP_MCS:
2055 mcs_known = iterator.this_arg[0];
2056 mcs_flags = iterator.this_arg[1];
2057 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2058 break;
2059
2060 rate_found = true;
2061 rate = iterator.this_arg[2];
2062 rate_flags = IEEE80211_TX_RC_MCS;
2063
2064 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2065 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2066 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2067
2068 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2069 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2070 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2071 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2072 break;
2073
2074 case IEEE80211_RADIOTAP_VHT:
2075 vht_known = get_unaligned_le16(iterator.this_arg);
2076 rate_found = true;
2077
2078 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2079 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2080 (iterator.this_arg[2] &
2081 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2082 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2083 if (vht_known &
2084 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2085 if (iterator.this_arg[3] == 1)
2086 rate_flags |=
2087 IEEE80211_TX_RC_40_MHZ_WIDTH;
2088 else if (iterator.this_arg[3] == 4)
2089 rate_flags |=
2090 IEEE80211_TX_RC_80_MHZ_WIDTH;
2091 else if (iterator.this_arg[3] == 11)
2092 rate_flags |=
2093 IEEE80211_TX_RC_160_MHZ_WIDTH;
2094 }
2095
2096 vht_mcs = iterator.this_arg[4] >> 4;
2097 vht_nss = iterator.this_arg[4] & 0xF;
2098 break;
2099
2100 /*
2101 * Please update the file
2102 * Documentation/networking/mac80211-injection.txt
2103 * when parsing new fields here.
2104 */
2105
2106 default:
2107 break;
2108 }
2109 }
2110
2111 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2112 return false;
2113
2114 if (rate_found) {
2115 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2116
2117 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2118 info->control.rates[i].idx = -1;
2119 info->control.rates[i].flags = 0;
2120 info->control.rates[i].count = 0;
2121 }
2122
2123 if (rate_flags & IEEE80211_TX_RC_MCS) {
2124 info->control.rates[0].idx = rate;
2125 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2126 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2127 vht_nss);
2128 } else {
2129 for (i = 0; i < sband->n_bitrates; i++) {
2130 if (rate * 5 != sband->bitrates[i].bitrate)
2131 continue;
2132
2133 info->control.rates[0].idx = i;
2134 break;
2135 }
2136 }
2137
2138 if (info->control.rates[0].idx < 0)
2139 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2140
2141 info->control.rates[0].flags = rate_flags;
2142 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2143 local->hw.max_rate_tries);
2144 }
2145
2146 /*
2147 * remove the radiotap header
2148 * iterator->_max_length was sanity-checked against
2149 * skb->len by iterator init
2150 */
2151 skb_pull(skb, iterator._max_length);
2152
2153 return true;
2154 }
2155
2156 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2157 struct net_device *dev)
2158 {
2159 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2160 struct ieee80211_chanctx_conf *chanctx_conf;
2161 struct ieee80211_radiotap_header *prthdr =
2162 (struct ieee80211_radiotap_header *)skb->data;
2163 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2164 struct ieee80211_hdr *hdr;
2165 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2166 struct cfg80211_chan_def *chandef;
2167 u16 len_rthdr;
2168 int hdrlen;
2169
2170 /* check for not even having the fixed radiotap header part */
2171 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2172 goto fail; /* too short to be possibly valid */
2173
2174 /* is it a header version we can trust to find length from? */
2175 if (unlikely(prthdr->it_version))
2176 goto fail; /* only version 0 is supported */
2177
2178 /* then there must be a radiotap header with a length we can use */
2179 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2180
2181 /* does the skb contain enough to deliver on the alleged length? */
2182 if (unlikely(skb->len < len_rthdr))
2183 goto fail; /* skb too short for claimed rt header extent */
2184
2185 /*
2186 * fix up the pointers accounting for the radiotap
2187 * header still being in there. We are being given
2188 * a precooked IEEE80211 header so no need for
2189 * normal processing
2190 */
2191 skb_set_mac_header(skb, len_rthdr);
2192 /*
2193 * these are just fixed to the end of the rt area since we
2194 * don't have any better information and at this point, nobody cares
2195 */
2196 skb_set_network_header(skb, len_rthdr);
2197 skb_set_transport_header(skb, len_rthdr);
2198
2199 if (skb->len < len_rthdr + 2)
2200 goto fail;
2201
2202 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2203 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2204
2205 if (skb->len < len_rthdr + hdrlen)
2206 goto fail;
2207
2208 /*
2209 * Initialize skb->protocol if the injected frame is a data frame
2210 * carrying a rfc1042 header
2211 */
2212 if (ieee80211_is_data(hdr->frame_control) &&
2213 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2214 u8 *payload = (u8 *)hdr + hdrlen;
2215
2216 if (ether_addr_equal(payload, rfc1042_header))
2217 skb->protocol = cpu_to_be16((payload[6] << 8) |
2218 payload[7]);
2219 }
2220
2221 memset(info, 0, sizeof(*info));
2222
2223 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2224 IEEE80211_TX_CTL_INJECTED;
2225
2226 rcu_read_lock();
2227
2228 /*
2229 * We process outgoing injected frames that have a local address
2230 * we handle as though they are non-injected frames.
2231 * This code here isn't entirely correct, the local MAC address
2232 * isn't always enough to find the interface to use; for proper
2233 * VLAN/WDS support we will need a different mechanism (which
2234 * likely isn't going to be monitor interfaces).
2235 */
2236 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2237
2238 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2239 if (!ieee80211_sdata_running(tmp_sdata))
2240 continue;
2241 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2242 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2243 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2244 continue;
2245 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2246 sdata = tmp_sdata;
2247 break;
2248 }
2249 }
2250
2251 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2252 if (!chanctx_conf) {
2253 tmp_sdata = rcu_dereference(local->monitor_sdata);
2254 if (tmp_sdata)
2255 chanctx_conf =
2256 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2257 }
2258
2259 if (chanctx_conf)
2260 chandef = &chanctx_conf->def;
2261 else if (!local->use_chanctx)
2262 chandef = &local->_oper_chandef;
2263 else
2264 goto fail_rcu;
2265
2266 /*
2267 * Frame injection is not allowed if beaconing is not allowed
2268 * or if we need radar detection. Beaconing is usually not allowed when
2269 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2270 * Passive scan is also used in world regulatory domains where
2271 * your country is not known and as such it should be treated as
2272 * NO TX unless the channel is explicitly allowed in which case
2273 * your current regulatory domain would not have the passive scan
2274 * flag.
2275 *
2276 * Since AP mode uses monitor interfaces to inject/TX management
2277 * frames we can make AP mode the exception to this rule once it
2278 * supports radar detection as its implementation can deal with
2279 * radar detection by itself. We can do that later by adding a
2280 * monitor flag interfaces used for AP support.
2281 */
2282 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2283 sdata->vif.type))
2284 goto fail_rcu;
2285
2286 info->band = chandef->chan->band;
2287
2288 /* process and remove the injection radiotap header */
2289 if (!ieee80211_parse_tx_radiotap(local, skb))
2290 goto fail_rcu;
2291
2292 ieee80211_xmit(sdata, NULL, skb);
2293 rcu_read_unlock();
2294
2295 return NETDEV_TX_OK;
2296
2297 fail_rcu:
2298 rcu_read_unlock();
2299 fail:
2300 dev_kfree_skb(skb);
2301 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2302 }
2303
2304 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2305 {
2306 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2307
2308 return ethertype == ETH_P_TDLS &&
2309 skb->len > 14 &&
2310 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2311 }
2312
2313 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2314 struct sk_buff *skb,
2315 struct sta_info **sta_out)
2316 {
2317 struct sta_info *sta;
2318
2319 switch (sdata->vif.type) {
2320 case NL80211_IFTYPE_AP_VLAN:
2321 sta = rcu_dereference(sdata->u.vlan.sta);
2322 if (sta) {
2323 *sta_out = sta;
2324 return 0;
2325 } else if (sdata->wdev.use_4addr) {
2326 return -ENOLINK;
2327 }
2328 /* fall through */
2329 case NL80211_IFTYPE_AP:
2330 case NL80211_IFTYPE_OCB:
2331 case NL80211_IFTYPE_ADHOC:
2332 if (is_multicast_ether_addr(skb->data)) {
2333 *sta_out = ERR_PTR(-ENOENT);
2334 return 0;
2335 }
2336 sta = sta_info_get_bss(sdata, skb->data);
2337 break;
2338 case NL80211_IFTYPE_WDS:
2339 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2340 break;
2341 #ifdef CONFIG_MAC80211_MESH
2342 case NL80211_IFTYPE_MESH_POINT:
2343 /* determined much later */
2344 *sta_out = NULL;
2345 return 0;
2346 #endif
2347 case NL80211_IFTYPE_STATION:
2348 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2349 sta = sta_info_get(sdata, skb->data);
2350 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2351 if (test_sta_flag(sta,
2352 WLAN_STA_TDLS_PEER_AUTH)) {
2353 *sta_out = sta;
2354 return 0;
2355 }
2356
2357 /*
2358 * TDLS link during setup - throw out frames to
2359 * peer. Allow TDLS-setup frames to unauthorized
2360 * peers for the special case of a link teardown
2361 * after a TDLS sta is removed due to being
2362 * unreachable.
2363 */
2364 if (!ieee80211_is_tdls_setup(skb))
2365 return -EINVAL;
2366 }
2367
2368 }
2369
2370 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2371 if (!sta)
2372 return -ENOLINK;
2373 break;
2374 default:
2375 return -EINVAL;
2376 }
2377
2378 *sta_out = sta ?: ERR_PTR(-ENOENT);
2379 return 0;
2380 }
2381
2382 /**
2383 * ieee80211_build_hdr - build 802.11 header in the given frame
2384 * @sdata: virtual interface to build the header for
2385 * @skb: the skb to build the header in
2386 * @info_flags: skb flags to set
2387 *
2388 * This function takes the skb with 802.3 header and reformats the header to
2389 * the appropriate IEEE 802.11 header based on which interface the packet is
2390 * being transmitted on.
2391 *
2392 * Note that this function also takes care of the TX status request and
2393 * potential unsharing of the SKB - this needs to be interleaved with the
2394 * header building.
2395 *
2396 * The function requires the read-side RCU lock held
2397 *
2398 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2399 */
2400 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2401 struct sk_buff *skb, u32 info_flags,
2402 struct sta_info *sta)
2403 {
2404 struct ieee80211_local *local = sdata->local;
2405 struct ieee80211_tx_info *info;
2406 int head_need;
2407 u16 ethertype, hdrlen, meshhdrlen = 0;
2408 __le16 fc;
2409 struct ieee80211_hdr hdr;
2410 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2411 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2412 const u8 *encaps_data;
2413 int encaps_len, skip_header_bytes;
2414 bool wme_sta = false, authorized = false;
2415 bool tdls_peer;
2416 bool multicast;
2417 u16 info_id = 0;
2418 struct ieee80211_chanctx_conf *chanctx_conf;
2419 struct ieee80211_sub_if_data *ap_sdata;
2420 enum nl80211_band band;
2421 int ret;
2422
2423 if (IS_ERR(sta))
2424 sta = NULL;
2425
2426 /* convert Ethernet header to proper 802.11 header (based on
2427 * operation mode) */
2428 ethertype = (skb->data[12] << 8) | skb->data[13];
2429 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2430
2431 switch (sdata->vif.type) {
2432 case NL80211_IFTYPE_AP_VLAN:
2433 if (sdata->wdev.use_4addr) {
2434 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2435 /* RA TA DA SA */
2436 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2437 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2438 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2439 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2440 hdrlen = 30;
2441 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2442 wme_sta = sta->sta.wme;
2443 }
2444 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2445 u.ap);
2446 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2447 if (!chanctx_conf) {
2448 ret = -ENOTCONN;
2449 goto free;
2450 }
2451 band = chanctx_conf->def.chan->band;
2452 if (sdata->wdev.use_4addr)
2453 break;
2454 /* fall through */
2455 case NL80211_IFTYPE_AP:
2456 if (sdata->vif.type == NL80211_IFTYPE_AP)
2457 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2458 if (!chanctx_conf) {
2459 ret = -ENOTCONN;
2460 goto free;
2461 }
2462 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2463 /* DA BSSID SA */
2464 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2465 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2466 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2467 hdrlen = 24;
2468 band = chanctx_conf->def.chan->band;
2469 break;
2470 case NL80211_IFTYPE_WDS:
2471 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2472 /* RA TA DA SA */
2473 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2474 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2475 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2476 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2477 hdrlen = 30;
2478 /*
2479 * This is the exception! WDS style interfaces are prohibited
2480 * when channel contexts are in used so this must be valid
2481 */
2482 band = local->hw.conf.chandef.chan->band;
2483 break;
2484 #ifdef CONFIG_MAC80211_MESH
2485 case NL80211_IFTYPE_MESH_POINT:
2486 if (!is_multicast_ether_addr(skb->data)) {
2487 struct sta_info *next_hop;
2488 bool mpp_lookup = true;
2489
2490 mpath = mesh_path_lookup(sdata, skb->data);
2491 if (mpath) {
2492 mpp_lookup = false;
2493 next_hop = rcu_dereference(mpath->next_hop);
2494 if (!next_hop ||
2495 !(mpath->flags & (MESH_PATH_ACTIVE |
2496 MESH_PATH_RESOLVING)))
2497 mpp_lookup = true;
2498 }
2499
2500 if (mpp_lookup) {
2501 mppath = mpp_path_lookup(sdata, skb->data);
2502 if (mppath)
2503 mppath->exp_time = jiffies;
2504 }
2505
2506 if (mppath && mpath)
2507 mesh_path_del(sdata, mpath->dst);
2508 }
2509
2510 /*
2511 * Use address extension if it is a packet from
2512 * another interface or if we know the destination
2513 * is being proxied by a portal (i.e. portal address
2514 * differs from proxied address)
2515 */
2516 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2517 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2518 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2519 skb->data, skb->data + ETH_ALEN);
2520 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2521 NULL, NULL);
2522 } else {
2523 /* DS -> MBSS (802.11-2012 13.11.3.3).
2524 * For unicast with unknown forwarding information,
2525 * destination might be in the MBSS or if that fails
2526 * forwarded to another mesh gate. In either case
2527 * resolution will be handled in ieee80211_xmit(), so
2528 * leave the original DA. This also works for mcast */
2529 const u8 *mesh_da = skb->data;
2530
2531 if (mppath)
2532 mesh_da = mppath->mpp;
2533 else if (mpath)
2534 mesh_da = mpath->dst;
2535
2536 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2537 mesh_da, sdata->vif.addr);
2538 if (is_multicast_ether_addr(mesh_da))
2539 /* DA TA mSA AE:SA */
2540 meshhdrlen = ieee80211_new_mesh_header(
2541 sdata, &mesh_hdr,
2542 skb->data + ETH_ALEN, NULL);
2543 else
2544 /* RA TA mDA mSA AE:DA SA */
2545 meshhdrlen = ieee80211_new_mesh_header(
2546 sdata, &mesh_hdr, skb->data,
2547 skb->data + ETH_ALEN);
2548
2549 }
2550 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2551 if (!chanctx_conf) {
2552 ret = -ENOTCONN;
2553 goto free;
2554 }
2555 band = chanctx_conf->def.chan->band;
2556 break;
2557 #endif
2558 case NL80211_IFTYPE_STATION:
2559 /* we already did checks when looking up the RA STA */
2560 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2561
2562 if (tdls_peer) {
2563 /* DA SA BSSID */
2564 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2565 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2566 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2567 hdrlen = 24;
2568 } else if (sdata->u.mgd.use_4addr &&
2569 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2570 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2571 IEEE80211_FCTL_TODS);
2572 /* RA TA DA SA */
2573 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2574 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2575 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2576 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2577 hdrlen = 30;
2578 } else {
2579 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2580 /* BSSID SA DA */
2581 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2582 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2583 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2584 hdrlen = 24;
2585 }
2586 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2587 if (!chanctx_conf) {
2588 ret = -ENOTCONN;
2589 goto free;
2590 }
2591 band = chanctx_conf->def.chan->band;
2592 break;
2593 case NL80211_IFTYPE_OCB:
2594 /* DA SA BSSID */
2595 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2596 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2597 eth_broadcast_addr(hdr.addr3);
2598 hdrlen = 24;
2599 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2600 if (!chanctx_conf) {
2601 ret = -ENOTCONN;
2602 goto free;
2603 }
2604 band = chanctx_conf->def.chan->band;
2605 break;
2606 case NL80211_IFTYPE_ADHOC:
2607 /* DA SA BSSID */
2608 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2609 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2610 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2611 hdrlen = 24;
2612 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2613 if (!chanctx_conf) {
2614 ret = -ENOTCONN;
2615 goto free;
2616 }
2617 band = chanctx_conf->def.chan->band;
2618 break;
2619 default:
2620 ret = -EINVAL;
2621 goto free;
2622 }
2623
2624 multicast = is_multicast_ether_addr(hdr.addr1);
2625
2626 /* sta is always NULL for mesh */
2627 if (sta) {
2628 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2629 wme_sta = sta->sta.wme;
2630 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2631 /* For mesh, the use of the QoS header is mandatory */
2632 wme_sta = true;
2633 }
2634
2635 /* receiver does QoS (which also means we do) use it */
2636 if (wme_sta) {
2637 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2638 hdrlen += 2;
2639 }
2640
2641 /*
2642 * Drop unicast frames to unauthorised stations unless they are
2643 * EAPOL frames from the local station.
2644 */
2645 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2646 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2647 !multicast && !authorized &&
2648 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2649 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2650 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2651 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2652 sdata->name, hdr.addr1);
2653 #endif
2654
2655 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2656
2657 ret = -EPERM;
2658 goto free;
2659 }
2660
2661 if (unlikely(!multicast && skb->sk &&
2662 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2663 struct sk_buff *ack_skb = skb_clone_sk(skb);
2664
2665 if (ack_skb) {
2666 unsigned long flags;
2667 int id;
2668
2669 spin_lock_irqsave(&local->ack_status_lock, flags);
2670 id = idr_alloc(&local->ack_status_frames, ack_skb,
2671 1, 0x10000, GFP_ATOMIC);
2672 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2673
2674 if (id >= 0) {
2675 info_id = id;
2676 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2677 } else {
2678 kfree_skb(ack_skb);
2679 }
2680 }
2681 }
2682
2683 /*
2684 * If the skb is shared we need to obtain our own copy.
2685 */
2686 if (skb_shared(skb)) {
2687 struct sk_buff *tmp_skb = skb;
2688
2689 /* can't happen -- skb is a clone if info_id != 0 */
2690 WARN_ON(info_id);
2691
2692 skb = skb_clone(skb, GFP_ATOMIC);
2693 kfree_skb(tmp_skb);
2694
2695 if (!skb) {
2696 ret = -ENOMEM;
2697 goto free;
2698 }
2699 }
2700
2701 hdr.frame_control = fc;
2702 hdr.duration_id = 0;
2703 hdr.seq_ctrl = 0;
2704
2705 skip_header_bytes = ETH_HLEN;
2706 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2707 encaps_data = bridge_tunnel_header;
2708 encaps_len = sizeof(bridge_tunnel_header);
2709 skip_header_bytes -= 2;
2710 } else if (ethertype >= ETH_P_802_3_MIN) {
2711 encaps_data = rfc1042_header;
2712 encaps_len = sizeof(rfc1042_header);
2713 skip_header_bytes -= 2;
2714 } else {
2715 encaps_data = NULL;
2716 encaps_len = 0;
2717 }
2718
2719 skb_pull(skb, skip_header_bytes);
2720 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2721
2722 /*
2723 * So we need to modify the skb header and hence need a copy of
2724 * that. The head_need variable above doesn't, so far, include
2725 * the needed header space that we don't need right away. If we
2726 * can, then we don't reallocate right now but only after the
2727 * frame arrives at the master device (if it does...)
2728 *
2729 * If we cannot, however, then we will reallocate to include all
2730 * the ever needed space. Also, if we need to reallocate it anyway,
2731 * make it big enough for everything we may ever need.
2732 */
2733
2734 if (head_need > 0 || skb_cloned(skb)) {
2735 head_need += sdata->encrypt_headroom;
2736 head_need += local->tx_headroom;
2737 head_need = max_t(int, 0, head_need);
2738 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2739 ieee80211_free_txskb(&local->hw, skb);
2740 skb = NULL;
2741 return ERR_PTR(-ENOMEM);
2742 }
2743 }
2744
2745 if (encaps_data)
2746 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2747
2748 #ifdef CONFIG_MAC80211_MESH
2749 if (meshhdrlen > 0)
2750 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2751 #endif
2752
2753 if (ieee80211_is_data_qos(fc)) {
2754 __le16 *qos_control;
2755
2756 qos_control = skb_push(skb, 2);
2757 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2758 /*
2759 * Maybe we could actually set some fields here, for now just
2760 * initialise to zero to indicate no special operation.
2761 */
2762 *qos_control = 0;
2763 } else
2764 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2765
2766 skb_reset_mac_header(skb);
2767
2768 info = IEEE80211_SKB_CB(skb);
2769 memset(info, 0, sizeof(*info));
2770
2771 info->flags = info_flags;
2772 info->ack_frame_id = info_id;
2773 info->band = band;
2774
2775 return skb;
2776 free:
2777 kfree_skb(skb);
2778 return ERR_PTR(ret);
2779 }
2780
2781 /*
2782 * fast-xmit overview
2783 *
2784 * The core idea of this fast-xmit is to remove per-packet checks by checking
2785 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2786 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2787 * much less work can be done per packet. For example, fragmentation must be
2788 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2789 * in the code here.
2790 *
2791 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2792 * header and other data to aid packet processing in ieee80211_xmit_fast().
2793 *
2794 * The most difficult part of this is that when any of these assumptions
2795 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2796 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2797 * since the per-packet code no longer checks the conditions. This is reflected
2798 * by the calls to these functions throughout the rest of the code, and must be
2799 * maintained if any of the TX path checks change.
2800 */
2801
2802 void ieee80211_check_fast_xmit(struct sta_info *sta)
2803 {
2804 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2805 struct ieee80211_local *local = sta->local;
2806 struct ieee80211_sub_if_data *sdata = sta->sdata;
2807 struct ieee80211_hdr *hdr = (void *)build.hdr;
2808 struct ieee80211_chanctx_conf *chanctx_conf;
2809 __le16 fc;
2810
2811 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2812 return;
2813
2814 /* Locking here protects both the pointer itself, and against concurrent
2815 * invocations winning data access races to, e.g., the key pointer that
2816 * is used.
2817 * Without it, the invocation of this function right after the key
2818 * pointer changes wouldn't be sufficient, as another CPU could access
2819 * the pointer, then stall, and then do the cache update after the CPU
2820 * that invalidated the key.
2821 * With the locking, such scenarios cannot happen as the check for the
2822 * key and the fast-tx assignment are done atomically, so the CPU that
2823 * modifies the key will either wait or other one will see the key
2824 * cleared/changed already.
2825 */
2826 spin_lock_bh(&sta->lock);
2827 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2828 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2829 sdata->vif.type == NL80211_IFTYPE_STATION)
2830 goto out;
2831
2832 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2833 goto out;
2834
2835 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2836 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2837 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2838 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2839 goto out;
2840
2841 if (sdata->noack_map)
2842 goto out;
2843
2844 /* fast-xmit doesn't handle fragmentation at all */
2845 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2846 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2847 goto out;
2848
2849 rcu_read_lock();
2850 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2851 if (!chanctx_conf) {
2852 rcu_read_unlock();
2853 goto out;
2854 }
2855 build.band = chanctx_conf->def.chan->band;
2856 rcu_read_unlock();
2857
2858 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2859
2860 switch (sdata->vif.type) {
2861 case NL80211_IFTYPE_ADHOC:
2862 /* DA SA BSSID */
2863 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2864 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2865 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2866 build.hdr_len = 24;
2867 break;
2868 case NL80211_IFTYPE_STATION:
2869 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2870 /* DA SA BSSID */
2871 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2872 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2873 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2874 build.hdr_len = 24;
2875 break;
2876 }
2877
2878 if (sdata->u.mgd.use_4addr) {
2879 /* non-regular ethertype cannot use the fastpath */
2880 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2881 IEEE80211_FCTL_TODS);
2882 /* RA TA DA SA */
2883 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2884 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2885 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2886 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2887 build.hdr_len = 30;
2888 break;
2889 }
2890 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2891 /* BSSID SA DA */
2892 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2893 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2894 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2895 build.hdr_len = 24;
2896 break;
2897 case NL80211_IFTYPE_AP_VLAN:
2898 if (sdata->wdev.use_4addr) {
2899 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2900 IEEE80211_FCTL_TODS);
2901 /* RA TA DA SA */
2902 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2903 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2904 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2905 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2906 build.hdr_len = 30;
2907 break;
2908 }
2909 /* fall through */
2910 case NL80211_IFTYPE_AP:
2911 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2912 /* DA BSSID SA */
2913 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2914 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2915 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2916 build.hdr_len = 24;
2917 break;
2918 default:
2919 /* not handled on fast-xmit */
2920 goto out;
2921 }
2922
2923 if (sta->sta.wme) {
2924 build.hdr_len += 2;
2925 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2926 }
2927
2928 /* We store the key here so there's no point in using rcu_dereference()
2929 * but that's fine because the code that changes the pointers will call
2930 * this function after doing so. For a single CPU that would be enough,
2931 * for multiple see the comment above.
2932 */
2933 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2934 if (!build.key)
2935 build.key = rcu_access_pointer(sdata->default_unicast_key);
2936 if (build.key) {
2937 bool gen_iv, iv_spc, mmic;
2938
2939 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2940 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2941 mmic = build.key->conf.flags &
2942 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
2943 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
2944
2945 /* don't handle software crypto */
2946 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2947 goto out;
2948
2949 switch (build.key->conf.cipher) {
2950 case WLAN_CIPHER_SUITE_CCMP:
2951 case WLAN_CIPHER_SUITE_CCMP_256:
2952 /* add fixed key ID */
2953 if (gen_iv) {
2954 (build.hdr + build.hdr_len)[3] =
2955 0x20 | (build.key->conf.keyidx << 6);
2956 build.pn_offs = build.hdr_len;
2957 }
2958 if (gen_iv || iv_spc)
2959 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2960 break;
2961 case WLAN_CIPHER_SUITE_GCMP:
2962 case WLAN_CIPHER_SUITE_GCMP_256:
2963 /* add fixed key ID */
2964 if (gen_iv) {
2965 (build.hdr + build.hdr_len)[3] =
2966 0x20 | (build.key->conf.keyidx << 6);
2967 build.pn_offs = build.hdr_len;
2968 }
2969 if (gen_iv || iv_spc)
2970 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2971 break;
2972 case WLAN_CIPHER_SUITE_TKIP:
2973 /* cannot handle MMIC or IV generation in xmit-fast */
2974 if (mmic || gen_iv)
2975 goto out;
2976 if (iv_spc)
2977 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2978 break;
2979 case WLAN_CIPHER_SUITE_WEP40:
2980 case WLAN_CIPHER_SUITE_WEP104:
2981 /* cannot handle IV generation in fast-xmit */
2982 if (gen_iv)
2983 goto out;
2984 if (iv_spc)
2985 build.hdr_len += IEEE80211_WEP_IV_LEN;
2986 break;
2987 case WLAN_CIPHER_SUITE_AES_CMAC:
2988 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2989 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2990 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2991 WARN(1,
2992 "management cipher suite 0x%x enabled for data\n",
2993 build.key->conf.cipher);
2994 goto out;
2995 default:
2996 /* we don't know how to generate IVs for this at all */
2997 if (WARN_ON(gen_iv))
2998 goto out;
2999 /* pure hardware keys are OK, of course */
3000 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
3001 break;
3002 /* cipher scheme might require space allocation */
3003 if (iv_spc &&
3004 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
3005 goto out;
3006 if (iv_spc)
3007 build.hdr_len += build.key->conf.iv_len;
3008 }
3009
3010 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3011 }
3012
3013 hdr->frame_control = fc;
3014
3015 memcpy(build.hdr + build.hdr_len,
3016 rfc1042_header, sizeof(rfc1042_header));
3017 build.hdr_len += sizeof(rfc1042_header);
3018
3019 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3020 /* if the kmemdup fails, continue w/o fast_tx */
3021 if (!fast_tx)
3022 goto out;
3023
3024 out:
3025 /* we might have raced against another call to this function */
3026 old = rcu_dereference_protected(sta->fast_tx,
3027 lockdep_is_held(&sta->lock));
3028 rcu_assign_pointer(sta->fast_tx, fast_tx);
3029 if (old)
3030 kfree_rcu(old, rcu_head);
3031 spin_unlock_bh(&sta->lock);
3032 }
3033
3034 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3035 {
3036 struct sta_info *sta;
3037
3038 rcu_read_lock();
3039 list_for_each_entry_rcu(sta, &local->sta_list, list)
3040 ieee80211_check_fast_xmit(sta);
3041 rcu_read_unlock();
3042 }
3043
3044 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3045 {
3046 struct ieee80211_local *local = sdata->local;
3047 struct sta_info *sta;
3048
3049 rcu_read_lock();
3050
3051 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3052 if (sdata != sta->sdata &&
3053 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3054 continue;
3055 ieee80211_check_fast_xmit(sta);
3056 }
3057
3058 rcu_read_unlock();
3059 }
3060
3061 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3062 {
3063 struct ieee80211_fast_tx *fast_tx;
3064
3065 spin_lock_bh(&sta->lock);
3066 fast_tx = rcu_dereference_protected(sta->fast_tx,
3067 lockdep_is_held(&sta->lock));
3068 RCU_INIT_POINTER(sta->fast_tx, NULL);
3069 spin_unlock_bh(&sta->lock);
3070
3071 if (fast_tx)
3072 kfree_rcu(fast_tx, rcu_head);
3073 }
3074
3075 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3076 struct sk_buff *skb, int headroom)
3077 {
3078 if (skb_headroom(skb) < headroom) {
3079 I802_DEBUG_INC(local->tx_expand_skb_head);
3080
3081 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3082 wiphy_debug(local->hw.wiphy,
3083 "failed to reallocate TX buffer\n");
3084 return false;
3085 }
3086 }
3087
3088 return true;
3089 }
3090
3091 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3092 struct ieee80211_fast_tx *fast_tx,
3093 struct sk_buff *skb)
3094 {
3095 struct ieee80211_local *local = sdata->local;
3096 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3097 struct ieee80211_hdr *hdr;
3098 struct ethhdr *amsdu_hdr;
3099 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3100 int subframe_len = skb->len - hdr_len;
3101 void *data;
3102 u8 *qc, *h_80211_src, *h_80211_dst;
3103 const u8 *bssid;
3104
3105 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3106 return false;
3107
3108 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3109 return true;
3110
3111 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr)))
3112 return false;
3113
3114 data = skb_push(skb, sizeof(*amsdu_hdr));
3115 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3116 hdr = data;
3117 amsdu_hdr = data + hdr_len;
3118 /* h_80211_src/dst is addr* field within hdr */
3119 h_80211_src = data + fast_tx->sa_offs;
3120 h_80211_dst = data + fast_tx->da_offs;
3121
3122 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3123 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3124 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3125
3126 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3127 * fields needs to be changed to BSSID for A-MSDU frames depending
3128 * on FromDS/ToDS values.
3129 */
3130 switch (sdata->vif.type) {
3131 case NL80211_IFTYPE_STATION:
3132 bssid = sdata->u.mgd.bssid;
3133 break;
3134 case NL80211_IFTYPE_AP:
3135 case NL80211_IFTYPE_AP_VLAN:
3136 bssid = sdata->vif.addr;
3137 break;
3138 default:
3139 bssid = NULL;
3140 }
3141
3142 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3143 ether_addr_copy(h_80211_src, bssid);
3144
3145 if (bssid && ieee80211_has_tods(hdr->frame_control))
3146 ether_addr_copy(h_80211_dst, bssid);
3147
3148 qc = ieee80211_get_qos_ctl(hdr);
3149 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3150
3151 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3152
3153 return true;
3154 }
3155
3156 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3157 struct sta_info *sta,
3158 struct ieee80211_fast_tx *fast_tx,
3159 struct sk_buff *skb)
3160 {
3161 struct ieee80211_local *local = sdata->local;
3162 struct fq *fq = &local->fq;
3163 struct fq_tin *tin;
3164 struct fq_flow *flow;
3165 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3166 struct ieee80211_txq *txq = sta->sta.txq[tid];
3167 struct txq_info *txqi;
3168 struct sk_buff **frag_tail, *head;
3169 int subframe_len = skb->len - ETH_ALEN;
3170 u8 max_subframes = sta->sta.max_amsdu_subframes;
3171 int max_frags = local->hw.max_tx_fragments;
3172 int max_amsdu_len = sta->sta.max_amsdu_len;
3173 __be16 len;
3174 void *data;
3175 bool ret = false;
3176 unsigned int orig_len;
3177 int n = 2, nfrags, pad = 0;
3178 u16 hdrlen;
3179
3180 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3181 return false;
3182
3183 if (!txq)
3184 return false;
3185
3186 txqi = to_txq_info(txq);
3187 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3188 return false;
3189
3190 if (sta->sta.max_rc_amsdu_len)
3191 max_amsdu_len = min_t(int, max_amsdu_len,
3192 sta->sta.max_rc_amsdu_len);
3193
3194 spin_lock_bh(&fq->lock);
3195
3196 /* TODO: Ideally aggregation should be done on dequeue to remain
3197 * responsive to environment changes.
3198 */
3199
3200 tin = &txqi->tin;
3201 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3202 head = skb_peek_tail(&flow->queue);
3203 if (!head)
3204 goto out;
3205
3206 orig_len = head->len;
3207
3208 if (skb->len + head->len > max_amsdu_len)
3209 goto out;
3210
3211 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3212 nfrags += 1 + skb_shinfo(head)->nr_frags;
3213 frag_tail = &skb_shinfo(head)->frag_list;
3214 while (*frag_tail) {
3215 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3216 frag_tail = &(*frag_tail)->next;
3217 n++;
3218 }
3219
3220 if (max_subframes && n > max_subframes)
3221 goto out;
3222
3223 if (max_frags && nfrags > max_frags)
3224 goto out;
3225
3226 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3227 goto out;
3228
3229 /*
3230 * Pad out the previous subframe to a multiple of 4 by adding the
3231 * padding to the next one, that's being added. Note that head->len
3232 * is the length of the full A-MSDU, but that works since each time
3233 * we add a new subframe we pad out the previous one to a multiple
3234 * of 4 and thus it no longer matters in the next round.
3235 */
3236 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3237 if ((head->len - hdrlen) & 3)
3238 pad = 4 - ((head->len - hdrlen) & 3);
3239
3240 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3241 2 + pad))
3242 goto out_recalc;
3243
3244 ret = true;
3245 data = skb_push(skb, ETH_ALEN + 2);
3246 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3247
3248 data += 2 * ETH_ALEN;
3249 len = cpu_to_be16(subframe_len);
3250 memcpy(data, &len, 2);
3251 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3252
3253 memset(skb_push(skb, pad), 0, pad);
3254
3255 head->len += skb->len;
3256 head->data_len += skb->len;
3257 *frag_tail = skb;
3258
3259 out_recalc:
3260 if (head->len != orig_len) {
3261 flow->backlog += head->len - orig_len;
3262 tin->backlog_bytes += head->len - orig_len;
3263
3264 fq_recalc_backlog(fq, tin, flow);
3265 }
3266 out:
3267 spin_unlock_bh(&fq->lock);
3268
3269 return ret;
3270 }
3271
3272 /*
3273 * Can be called while the sta lock is held. Anything that can cause packets to
3274 * be generated will cause deadlock!
3275 */
3276 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3277 struct sta_info *sta, u8 pn_offs,
3278 struct ieee80211_key *key,
3279 struct sk_buff *skb)
3280 {
3281 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3282 struct ieee80211_hdr *hdr = (void *)skb->data;
3283 u8 tid = IEEE80211_NUM_TIDS;
3284
3285 if (key)
3286 info->control.hw_key = &key->conf;
3287
3288 ieee80211_tx_stats(skb->dev, skb->len);
3289
3290 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3291 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3292 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3293 } else {
3294 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3295 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3296 sdata->sequence_number += 0x10;
3297 }
3298
3299 if (skb_shinfo(skb)->gso_size)
3300 sta->tx_stats.msdu[tid] +=
3301 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3302 else
3303 sta->tx_stats.msdu[tid]++;
3304
3305 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3306
3307 /* statistics normally done by ieee80211_tx_h_stats (but that
3308 * has to consider fragmentation, so is more complex)
3309 */
3310 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3311 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3312
3313 if (pn_offs) {
3314 u64 pn;
3315 u8 *crypto_hdr = skb->data + pn_offs;
3316
3317 switch (key->conf.cipher) {
3318 case WLAN_CIPHER_SUITE_CCMP:
3319 case WLAN_CIPHER_SUITE_CCMP_256:
3320 case WLAN_CIPHER_SUITE_GCMP:
3321 case WLAN_CIPHER_SUITE_GCMP_256:
3322 pn = atomic64_inc_return(&key->conf.tx_pn);
3323 crypto_hdr[0] = pn;
3324 crypto_hdr[1] = pn >> 8;
3325 crypto_hdr[4] = pn >> 16;
3326 crypto_hdr[5] = pn >> 24;
3327 crypto_hdr[6] = pn >> 32;
3328 crypto_hdr[7] = pn >> 40;
3329 break;
3330 }
3331 }
3332 }
3333
3334 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3335 struct sta_info *sta,
3336 struct ieee80211_fast_tx *fast_tx,
3337 struct sk_buff *skb)
3338 {
3339 struct ieee80211_local *local = sdata->local;
3340 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3341 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3342 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3343 struct ethhdr eth;
3344 struct ieee80211_tx_info *info;
3345 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3346 struct ieee80211_tx_data tx;
3347 ieee80211_tx_result r;
3348 struct tid_ampdu_tx *tid_tx = NULL;
3349 u8 tid = IEEE80211_NUM_TIDS;
3350
3351 /* control port protocol needs a lot of special handling */
3352 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3353 return false;
3354
3355 /* only RFC 1042 SNAP */
3356 if (ethertype < ETH_P_802_3_MIN)
3357 return false;
3358
3359 /* don't handle TX status request here either */
3360 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3361 return false;
3362
3363 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3364 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3365 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3366 if (tid_tx) {
3367 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3368 return false;
3369 if (tid_tx->timeout)
3370 tid_tx->last_tx = jiffies;
3371 }
3372 }
3373
3374 /* after this point (skb is modified) we cannot return false */
3375
3376 if (skb_shared(skb)) {
3377 struct sk_buff *tmp_skb = skb;
3378
3379 skb = skb_clone(skb, GFP_ATOMIC);
3380 kfree_skb(tmp_skb);
3381
3382 if (!skb)
3383 return true;
3384 }
3385
3386 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3387 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3388 return true;
3389
3390 /* will not be crypto-handled beyond what we do here, so use false
3391 * as the may-encrypt argument for the resize to not account for
3392 * more room than we already have in 'extra_head'
3393 */
3394 if (unlikely(ieee80211_skb_resize(sdata, skb,
3395 max_t(int, extra_head + hw_headroom -
3396 skb_headroom(skb), 0),
3397 false))) {
3398 kfree_skb(skb);
3399 return true;
3400 }
3401
3402 memcpy(ð, skb->data, ETH_HLEN - 2);
3403 hdr = skb_push(skb, extra_head);
3404 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3405 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3406 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3407
3408 info = IEEE80211_SKB_CB(skb);
3409 memset(info, 0, sizeof(*info));
3410 info->band = fast_tx->band;
3411 info->control.vif = &sdata->vif;
3412 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3413 IEEE80211_TX_CTL_DONTFRAG |
3414 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3415 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3416
3417 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3418 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3419 *ieee80211_get_qos_ctl(hdr) = tid;
3420 }
3421
3422 __skb_queue_head_init(&tx.skbs);
3423
3424 tx.flags = IEEE80211_TX_UNICAST;
3425 tx.local = local;
3426 tx.sdata = sdata;
3427 tx.sta = sta;
3428 tx.key = fast_tx->key;
3429
3430 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3431 tx.skb = skb;
3432 r = ieee80211_tx_h_rate_ctrl(&tx);
3433 skb = tx.skb;
3434 tx.skb = NULL;
3435
3436 if (r != TX_CONTINUE) {
3437 if (r != TX_QUEUED)
3438 kfree_skb(skb);
3439 return true;
3440 }
3441 }
3442
3443 if (ieee80211_queue_skb(local, sdata, sta, skb))
3444 return true;
3445
3446 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3447 fast_tx->key, skb);
3448
3449 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3450 sdata = container_of(sdata->bss,
3451 struct ieee80211_sub_if_data, u.ap);
3452
3453 __skb_queue_tail(&tx.skbs, skb);
3454 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3455 return true;
3456 }
3457
3458 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3459 struct ieee80211_txq *txq)
3460 {
3461 struct ieee80211_local *local = hw_to_local(hw);
3462 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3463 struct ieee80211_hdr *hdr;
3464 struct sk_buff *skb = NULL;
3465 struct fq *fq = &local->fq;
3466 struct fq_tin *tin = &txqi->tin;
3467 struct ieee80211_tx_info *info;
3468 struct ieee80211_tx_data tx;
3469 ieee80211_tx_result r;
3470 struct ieee80211_vif *vif;
3471
3472 spin_lock_bh(&fq->lock);
3473
3474 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3475 goto out;
3476
3477 /* Make sure fragments stay together. */
3478 skb = __skb_dequeue(&txqi->frags);
3479 if (skb)
3480 goto out;
3481
3482 begin:
3483 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3484 if (!skb)
3485 goto out;
3486
3487 hdr = (struct ieee80211_hdr *)skb->data;
3488 info = IEEE80211_SKB_CB(skb);
3489
3490 memset(&tx, 0, sizeof(tx));
3491 __skb_queue_head_init(&tx.skbs);
3492 tx.local = local;
3493 tx.skb = skb;
3494 tx.sdata = vif_to_sdata(info->control.vif);
3495
3496 if (txq->sta)
3497 tx.sta = container_of(txq->sta, struct sta_info, sta);
3498
3499 /*
3500 * The key can be removed while the packet was queued, so need to call
3501 * this here to get the current key.
3502 */
3503 r = ieee80211_tx_h_select_key(&tx);
3504 if (r != TX_CONTINUE) {
3505 ieee80211_free_txskb(&local->hw, skb);
3506 goto begin;
3507 }
3508
3509 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3510 info->flags |= IEEE80211_TX_CTL_AMPDU;
3511 else
3512 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3513
3514 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3515 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3516 sta);
3517 u8 pn_offs = 0;
3518
3519 if (tx.key &&
3520 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3521 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3522
3523 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3524 tx.key, skb);
3525 } else {
3526 if (invoke_tx_handlers_late(&tx))
3527 goto begin;
3528
3529 skb = __skb_dequeue(&tx.skbs);
3530
3531 if (!skb_queue_empty(&tx.skbs))
3532 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3533 }
3534
3535 if (skb && skb_has_frag_list(skb) &&
3536 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3537 if (skb_linearize(skb)) {
3538 ieee80211_free_txskb(&local->hw, skb);
3539 goto begin;
3540 }
3541 }
3542
3543 switch (tx.sdata->vif.type) {
3544 case NL80211_IFTYPE_MONITOR:
3545 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3546 vif = &tx.sdata->vif;
3547 break;
3548 }
3549 tx.sdata = rcu_dereference(local->monitor_sdata);
3550 if (tx.sdata) {
3551 vif = &tx.sdata->vif;
3552 info->hw_queue =
3553 vif->hw_queue[skb_get_queue_mapping(skb)];
3554 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3555 ieee80211_free_txskb(&local->hw, skb);
3556 goto begin;
3557 } else {
3558 vif = NULL;
3559 }
3560 break;
3561 case NL80211_IFTYPE_AP_VLAN:
3562 tx.sdata = container_of(tx.sdata->bss,
3563 struct ieee80211_sub_if_data, u.ap);
3564 /* fall through */
3565 default:
3566 vif = &tx.sdata->vif;
3567 break;
3568 }
3569
3570 IEEE80211_SKB_CB(skb)->control.vif = vif;
3571 out:
3572 spin_unlock_bh(&fq->lock);
3573
3574 return skb;
3575 }
3576 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3577
3578 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3579 struct net_device *dev,
3580 u32 info_flags)
3581 {
3582 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3583 struct sta_info *sta;
3584 struct sk_buff *next;
3585
3586 if (unlikely(skb->len < ETH_HLEN)) {
3587 kfree_skb(skb);
3588 return;
3589 }
3590
3591 rcu_read_lock();
3592
3593 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3594 goto out_free;
3595
3596 if (!IS_ERR_OR_NULL(sta)) {
3597 struct ieee80211_fast_tx *fast_tx;
3598
3599 /* We need a bit of data queued to build aggregates properly, so
3600 * instruct the TCP stack to allow more than a single ms of data
3601 * to be queued in the stack. The value is a bit-shift of 1
3602 * second, so 8 is ~4ms of queued data. Only affects local TCP
3603 * sockets.
3604 */
3605 sk_pacing_shift_update(skb->sk, 8);
3606
3607 fast_tx = rcu_dereference(sta->fast_tx);
3608
3609 if (fast_tx &&
3610 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3611 goto out;
3612 }
3613
3614 if (skb_is_gso(skb)) {
3615 struct sk_buff *segs;
3616
3617 segs = skb_gso_segment(skb, 0);
3618 if (IS_ERR(segs)) {
3619 goto out_free;
3620 } else if (segs) {
3621 consume_skb(skb);
3622 skb = segs;
3623 }
3624 } else {
3625 /* we cannot process non-linear frames on this path */
3626 if (skb_linearize(skb)) {
3627 kfree_skb(skb);
3628 goto out;
3629 }
3630
3631 /* the frame could be fragmented, software-encrypted, and other
3632 * things so we cannot really handle checksum offload with it -
3633 * fix it up in software before we handle anything else.
3634 */
3635 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3636 skb_set_transport_header(skb,
3637 skb_checksum_start_offset(skb));
3638 if (skb_checksum_help(skb))
3639 goto out_free;
3640 }
3641 }
3642
3643 next = skb;
3644 while (next) {
3645 skb = next;
3646 next = skb->next;
3647
3648 skb->prev = NULL;
3649 skb->next = NULL;
3650
3651 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3652 if (IS_ERR(skb))
3653 goto out;
3654
3655 ieee80211_tx_stats(dev, skb->len);
3656
3657 ieee80211_xmit(sdata, sta, skb);
3658 }
3659 goto out;
3660 out_free:
3661 kfree_skb(skb);
3662 out:
3663 rcu_read_unlock();
3664 }
3665
3666 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3667 {
3668 struct ethhdr *eth;
3669 int err;
3670
3671 err = skb_ensure_writable(skb, ETH_HLEN);
3672 if (unlikely(err))
3673 return err;
3674
3675 eth = (void *)skb->data;
3676 ether_addr_copy(eth->h_dest, sta->sta.addr);
3677
3678 return 0;
3679 }
3680
3681 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3682 struct net_device *dev)
3683 {
3684 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3685 const struct ethhdr *eth = (void *)skb->data;
3686 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3687 __be16 ethertype;
3688
3689 if (likely(!is_multicast_ether_addr(eth->h_dest)))
3690 return false;
3691
3692 switch (sdata->vif.type) {
3693 case NL80211_IFTYPE_AP_VLAN:
3694 if (sdata->u.vlan.sta)
3695 return false;
3696 if (sdata->wdev.use_4addr)
3697 return false;
3698 /* fall through */
3699 case NL80211_IFTYPE_AP:
3700 /* check runtime toggle for this bss */
3701 if (!sdata->bss->multicast_to_unicast)
3702 return false;
3703 break;
3704 default:
3705 return false;
3706 }
3707
3708 /* multicast to unicast conversion only for some payload */
3709 ethertype = eth->h_proto;
3710 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3711 ethertype = ethvlan->h_vlan_encapsulated_proto;
3712 switch (ethertype) {
3713 case htons(ETH_P_ARP):
3714 case htons(ETH_P_IP):
3715 case htons(ETH_P_IPV6):
3716 break;
3717 default:
3718 return false;
3719 }
3720
3721 return true;
3722 }
3723
3724 static void
3725 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3726 struct sk_buff_head *queue)
3727 {
3728 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3729 struct ieee80211_local *local = sdata->local;
3730 const struct ethhdr *eth = (struct ethhdr *)skb->data;
3731 struct sta_info *sta, *first = NULL;
3732 struct sk_buff *cloned_skb;
3733
3734 rcu_read_lock();
3735
3736 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3737 if (sdata != sta->sdata)
3738 /* AP-VLAN mismatch */
3739 continue;
3740 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3741 /* do not send back to source */
3742 continue;
3743 if (!first) {
3744 first = sta;
3745 continue;
3746 }
3747 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3748 if (!cloned_skb)
3749 goto multicast;
3750 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3751 dev_kfree_skb(cloned_skb);
3752 goto multicast;
3753 }
3754 __skb_queue_tail(queue, cloned_skb);
3755 }
3756
3757 if (likely(first)) {
3758 if (unlikely(ieee80211_change_da(skb, first)))
3759 goto multicast;
3760 __skb_queue_tail(queue, skb);
3761 } else {
3762 /* no STA connected, drop */
3763 kfree_skb(skb);
3764 skb = NULL;
3765 }
3766
3767 goto out;
3768 multicast:
3769 __skb_queue_purge(queue);
3770 __skb_queue_tail(queue, skb);
3771 out:
3772 rcu_read_unlock();
3773 }
3774
3775 /**
3776 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3777 * @skb: packet to be sent
3778 * @dev: incoming interface
3779 *
3780 * On failure skb will be freed.
3781 */
3782 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3783 struct net_device *dev)
3784 {
3785 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3786 struct sk_buff_head queue;
3787
3788 __skb_queue_head_init(&queue);
3789 ieee80211_convert_to_unicast(skb, dev, &queue);
3790 while ((skb = __skb_dequeue(&queue)))
3791 __ieee80211_subif_start_xmit(skb, dev, 0);
3792 } else {
3793 __ieee80211_subif_start_xmit(skb, dev, 0);
3794 }
3795
3796 return NETDEV_TX_OK;
3797 }
3798
3799 struct sk_buff *
3800 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3801 struct sk_buff *skb, u32 info_flags)
3802 {
3803 struct ieee80211_hdr *hdr;
3804 struct ieee80211_tx_data tx = {
3805 .local = sdata->local,
3806 .sdata = sdata,
3807 };
3808 struct sta_info *sta;
3809
3810 rcu_read_lock();
3811
3812 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3813 kfree_skb(skb);
3814 skb = ERR_PTR(-EINVAL);
3815 goto out;
3816 }
3817
3818 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3819 if (IS_ERR(skb))
3820 goto out;
3821
3822 hdr = (void *)skb->data;
3823 tx.sta = sta_info_get(sdata, hdr->addr1);
3824 tx.skb = skb;
3825
3826 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3827 rcu_read_unlock();
3828 kfree_skb(skb);
3829 return ERR_PTR(-EINVAL);
3830 }
3831
3832 out:
3833 rcu_read_unlock();
3834 return skb;
3835 }
3836
3837 /*
3838 * ieee80211_clear_tx_pending may not be called in a context where
3839 * it is possible that it packets could come in again.
3840 */
3841 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3842 {
3843 struct sk_buff *skb;
3844 int i;
3845
3846 for (i = 0; i < local->hw.queues; i++) {
3847 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3848 ieee80211_free_txskb(&local->hw, skb);
3849 }
3850 }
3851
3852 /*
3853 * Returns false if the frame couldn't be transmitted but was queued instead,
3854 * which in this case means re-queued -- take as an indication to stop sending
3855 * more pending frames.
3856 */
3857 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3858 struct sk_buff *skb)
3859 {
3860 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3861 struct ieee80211_sub_if_data *sdata;
3862 struct sta_info *sta;
3863 struct ieee80211_hdr *hdr;
3864 bool result;
3865 struct ieee80211_chanctx_conf *chanctx_conf;
3866
3867 sdata = vif_to_sdata(info->control.vif);
3868
3869 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3870 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3871 if (unlikely(!chanctx_conf)) {
3872 dev_kfree_skb(skb);
3873 return true;
3874 }
3875 info->band = chanctx_conf->def.chan->band;
3876 result = ieee80211_tx(sdata, NULL, skb, true);
3877 } else {
3878 struct sk_buff_head skbs;
3879
3880 __skb_queue_head_init(&skbs);
3881 __skb_queue_tail(&skbs, skb);
3882
3883 hdr = (struct ieee80211_hdr *)skb->data;
3884 sta = sta_info_get(sdata, hdr->addr1);
3885
3886 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3887 }
3888
3889 return result;
3890 }
3891
3892 /*
3893 * Transmit all pending packets. Called from tasklet.
3894 */
3895 void ieee80211_tx_pending(unsigned long data)
3896 {
3897 struct ieee80211_local *local = (struct ieee80211_local *)data;
3898 unsigned long flags;
3899 int i;
3900 bool txok;
3901
3902 rcu_read_lock();
3903
3904 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3905 for (i = 0; i < local->hw.queues; i++) {
3906 /*
3907 * If queue is stopped by something other than due to pending
3908 * frames, or we have no pending frames, proceed to next queue.
3909 */
3910 if (local->queue_stop_reasons[i] ||
3911 skb_queue_empty(&local->pending[i]))
3912 continue;
3913
3914 while (!skb_queue_empty(&local->pending[i])) {
3915 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3916 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3917
3918 if (WARN_ON(!info->control.vif)) {
3919 ieee80211_free_txskb(&local->hw, skb);
3920 continue;
3921 }
3922
3923 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3924 flags);
3925
3926 txok = ieee80211_tx_pending_skb(local, skb);
3927 spin_lock_irqsave(&local->queue_stop_reason_lock,
3928 flags);
3929 if (!txok)
3930 break;
3931 }
3932
3933 if (skb_queue_empty(&local->pending[i]))
3934 ieee80211_propagate_queue_wake(local, i);
3935 }
3936 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3937
3938 rcu_read_unlock();
3939 }
3940
3941 /* functions for drivers to get certain frames */
3942
3943 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3944 struct ps_data *ps, struct sk_buff *skb,
3945 bool is_template)
3946 {
3947 u8 *pos, *tim;
3948 int aid0 = 0;
3949 int i, have_bits = 0, n1, n2;
3950
3951 /* Generate bitmap for TIM only if there are any STAs in power save
3952 * mode. */
3953 if (atomic_read(&ps->num_sta_ps) > 0)
3954 /* in the hope that this is faster than
3955 * checking byte-for-byte */
3956 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3957 IEEE80211_MAX_AID+1);
3958 if (!is_template) {
3959 if (ps->dtim_count == 0)
3960 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3961 else
3962 ps->dtim_count--;
3963 }
3964
3965 tim = pos = skb_put(skb, 6);
3966 *pos++ = WLAN_EID_TIM;
3967 *pos++ = 4;
3968 *pos++ = ps->dtim_count;
3969 *pos++ = sdata->vif.bss_conf.dtim_period;
3970
3971 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3972 aid0 = 1;
3973
3974 ps->dtim_bc_mc = aid0 == 1;
3975
3976 if (have_bits) {
3977 /* Find largest even number N1 so that bits numbered 1 through
3978 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3979 * (N2 + 1) x 8 through 2007 are 0. */
3980 n1 = 0;
3981 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3982 if (ps->tim[i]) {
3983 n1 = i & 0xfe;
3984 break;
3985 }
3986 }
3987 n2 = n1;
3988 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3989 if (ps->tim[i]) {
3990 n2 = i;
3991 break;
3992 }
3993 }
3994
3995 /* Bitmap control */
3996 *pos++ = n1 | aid0;
3997 /* Part Virt Bitmap */
3998 skb_put(skb, n2 - n1);
3999 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
4000
4001 tim[1] = n2 - n1 + 4;
4002 } else {
4003 *pos++ = aid0; /* Bitmap control */
4004 *pos++ = 0; /* Part Virt Bitmap */
4005 }
4006 }
4007
4008 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4009 struct ps_data *ps, struct sk_buff *skb,
4010 bool is_template)
4011 {
4012 struct ieee80211_local *local = sdata->local;
4013
4014 /*
4015 * Not very nice, but we want to allow the driver to call
4016 * ieee80211_beacon_get() as a response to the set_tim()
4017 * callback. That, however, is already invoked under the
4018 * sta_lock to guarantee consistent and race-free update
4019 * of the tim bitmap in mac80211 and the driver.
4020 */
4021 if (local->tim_in_locked_section) {
4022 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4023 } else {
4024 spin_lock_bh(&local->tim_lock);
4025 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4026 spin_unlock_bh(&local->tim_lock);
4027 }
4028
4029 return 0;
4030 }
4031
4032 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
4033 struct beacon_data *beacon)
4034 {
4035 struct probe_resp *resp;
4036 u8 *beacon_data;
4037 size_t beacon_data_len;
4038 int i;
4039 u8 count = beacon->csa_current_counter;
4040
4041 switch (sdata->vif.type) {
4042 case NL80211_IFTYPE_AP:
4043 beacon_data = beacon->tail;
4044 beacon_data_len = beacon->tail_len;
4045 break;
4046 case NL80211_IFTYPE_ADHOC:
4047 beacon_data = beacon->head;
4048 beacon_data_len = beacon->head_len;
4049 break;
4050 case NL80211_IFTYPE_MESH_POINT:
4051 beacon_data = beacon->head;
4052 beacon_data_len = beacon->head_len;
4053 break;
4054 default:
4055 return;
4056 }
4057
4058 rcu_read_lock();
4059 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
4060 resp = rcu_dereference(sdata->u.ap.probe_resp);
4061
4062 if (beacon->csa_counter_offsets[i]) {
4063 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
4064 beacon_data_len)) {
4065 rcu_read_unlock();
4066 return;
4067 }
4068
4069 beacon_data[beacon->csa_counter_offsets[i]] = count;
4070 }
4071
4072 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
4073 resp->data[resp->csa_counter_offsets[i]] = count;
4074 }
4075 rcu_read_unlock();
4076 }
4077
4078 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
4079 {
4080 beacon->csa_current_counter--;
4081
4082 /* the counter should never reach 0 */
4083 WARN_ON_ONCE(!beacon->csa_current_counter);
4084
4085 return beacon->csa_current_counter;
4086 }
4087
4088 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4089 {
4090 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4091 struct beacon_data *beacon = NULL;
4092 u8 count = 0;
4093
4094 rcu_read_lock();
4095
4096 if (sdata->vif.type == NL80211_IFTYPE_AP)
4097 beacon = rcu_dereference(sdata->u.ap.beacon);
4098 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4099 beacon = rcu_dereference(sdata->u.ibss.presp);
4100 else if (ieee80211_vif_is_mesh(&sdata->vif))
4101 beacon = rcu_dereference(sdata->u.mesh.beacon);
4102
4103 if (!beacon)
4104 goto unlock;
4105
4106 count = __ieee80211_csa_update_counter(beacon);
4107
4108 unlock:
4109 rcu_read_unlock();
4110 return count;
4111 }
4112 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4113
4114 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter)
4115 {
4116 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4117 struct beacon_data *beacon = NULL;
4118
4119 rcu_read_lock();
4120
4121 if (sdata->vif.type == NL80211_IFTYPE_AP)
4122 beacon = rcu_dereference(sdata->u.ap.beacon);
4123 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4124 beacon = rcu_dereference(sdata->u.ibss.presp);
4125 else if (ieee80211_vif_is_mesh(&sdata->vif))
4126 beacon = rcu_dereference(sdata->u.mesh.beacon);
4127
4128 if (!beacon)
4129 goto unlock;
4130
4131 if (counter < beacon->csa_current_counter)
4132 beacon->csa_current_counter = counter;
4133
4134 unlock:
4135 rcu_read_unlock();
4136 }
4137 EXPORT_SYMBOL(ieee80211_csa_set_counter);
4138
4139 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4140 {
4141 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4142 struct beacon_data *beacon = NULL;
4143 u8 *beacon_data;
4144 size_t beacon_data_len;
4145 int ret = false;
4146
4147 if (!ieee80211_sdata_running(sdata))
4148 return false;
4149
4150 rcu_read_lock();
4151 if (vif->type == NL80211_IFTYPE_AP) {
4152 struct ieee80211_if_ap *ap = &sdata->u.ap;
4153
4154 beacon = rcu_dereference(ap->beacon);
4155 if (WARN_ON(!beacon || !beacon->tail))
4156 goto out;
4157 beacon_data = beacon->tail;
4158 beacon_data_len = beacon->tail_len;
4159 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4160 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4161
4162 beacon = rcu_dereference(ifibss->presp);
4163 if (!beacon)
4164 goto out;
4165
4166 beacon_data = beacon->head;
4167 beacon_data_len = beacon->head_len;
4168 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4169 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4170
4171 beacon = rcu_dereference(ifmsh->beacon);
4172 if (!beacon)
4173 goto out;
4174
4175 beacon_data = beacon->head;
4176 beacon_data_len = beacon->head_len;
4177 } else {
4178 WARN_ON(1);
4179 goto out;
4180 }
4181
4182 if (!beacon->csa_counter_offsets[0])
4183 goto out;
4184
4185 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4186 goto out;
4187
4188 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4189 ret = true;
4190 out:
4191 rcu_read_unlock();
4192
4193 return ret;
4194 }
4195 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4196
4197 static struct sk_buff *
4198 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4199 struct ieee80211_vif *vif,
4200 struct ieee80211_mutable_offsets *offs,
4201 bool is_template)
4202 {
4203 struct ieee80211_local *local = hw_to_local(hw);
4204 struct beacon_data *beacon = NULL;
4205 struct sk_buff *skb = NULL;
4206 struct ieee80211_tx_info *info;
4207 struct ieee80211_sub_if_data *sdata = NULL;
4208 enum nl80211_band band;
4209 struct ieee80211_tx_rate_control txrc;
4210 struct ieee80211_chanctx_conf *chanctx_conf;
4211 int csa_off_base = 0;
4212
4213 rcu_read_lock();
4214
4215 sdata = vif_to_sdata(vif);
4216 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4217
4218 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4219 goto out;
4220
4221 if (offs)
4222 memset(offs, 0, sizeof(*offs));
4223
4224 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4225 struct ieee80211_if_ap *ap = &sdata->u.ap;
4226
4227 beacon = rcu_dereference(ap->beacon);
4228 if (beacon) {
4229 if (beacon->csa_counter_offsets[0]) {
4230 if (!is_template)
4231 __ieee80211_csa_update_counter(beacon);
4232
4233 ieee80211_set_csa(sdata, beacon);
4234 }
4235
4236 /*
4237 * headroom, head length,
4238 * tail length and maximum TIM length
4239 */
4240 skb = dev_alloc_skb(local->tx_headroom +
4241 beacon->head_len +
4242 beacon->tail_len + 256 +
4243 local->hw.extra_beacon_tailroom);
4244 if (!skb)
4245 goto out;
4246
4247 skb_reserve(skb, local->tx_headroom);
4248 skb_put_data(skb, beacon->head, beacon->head_len);
4249
4250 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4251 is_template);
4252
4253 if (offs) {
4254 offs->tim_offset = beacon->head_len;
4255 offs->tim_length = skb->len - beacon->head_len;
4256
4257 /* for AP the csa offsets are from tail */
4258 csa_off_base = skb->len;
4259 }
4260
4261 if (beacon->tail)
4262 skb_put_data(skb, beacon->tail,
4263 beacon->tail_len);
4264 } else
4265 goto out;
4266 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4267 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4268 struct ieee80211_hdr *hdr;
4269
4270 beacon = rcu_dereference(ifibss->presp);
4271 if (!beacon)
4272 goto out;
4273
4274 if (beacon->csa_counter_offsets[0]) {
4275 if (!is_template)
4276 __ieee80211_csa_update_counter(beacon);
4277
4278 ieee80211_set_csa(sdata, beacon);
4279 }
4280
4281 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4282 local->hw.extra_beacon_tailroom);
4283 if (!skb)
4284 goto out;
4285 skb_reserve(skb, local->tx_headroom);
4286 skb_put_data(skb, beacon->head, beacon->head_len);
4287
4288 hdr = (struct ieee80211_hdr *) skb->data;
4289 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4290 IEEE80211_STYPE_BEACON);
4291 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4292 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4293
4294 beacon = rcu_dereference(ifmsh->beacon);
4295 if (!beacon)
4296 goto out;
4297
4298 if (beacon->csa_counter_offsets[0]) {
4299 if (!is_template)
4300 /* TODO: For mesh csa_counter is in TU, so
4301 * decrementing it by one isn't correct, but
4302 * for now we leave it consistent with overall
4303 * mac80211's behavior.
4304 */
4305 __ieee80211_csa_update_counter(beacon);
4306
4307 ieee80211_set_csa(sdata, beacon);
4308 }
4309
4310 if (ifmsh->sync_ops)
4311 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4312
4313 skb = dev_alloc_skb(local->tx_headroom +
4314 beacon->head_len +
4315 256 + /* TIM IE */
4316 beacon->tail_len +
4317 local->hw.extra_beacon_tailroom);
4318 if (!skb)
4319 goto out;
4320 skb_reserve(skb, local->tx_headroom);
4321 skb_put_data(skb, beacon->head, beacon->head_len);
4322 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4323
4324 if (offs) {
4325 offs->tim_offset = beacon->head_len;
4326 offs->tim_length = skb->len - beacon->head_len;
4327 }
4328
4329 skb_put_data(skb, beacon->tail, beacon->tail_len);
4330 } else {
4331 WARN_ON(1);
4332 goto out;
4333 }
4334
4335 /* CSA offsets */
4336 if (offs && beacon) {
4337 int i;
4338
4339 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4340 u16 csa_off = beacon->csa_counter_offsets[i];
4341
4342 if (!csa_off)
4343 continue;
4344
4345 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4346 }
4347 }
4348
4349 band = chanctx_conf->def.chan->band;
4350
4351 info = IEEE80211_SKB_CB(skb);
4352
4353 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4354 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4355 info->band = band;
4356
4357 memset(&txrc, 0, sizeof(txrc));
4358 txrc.hw = hw;
4359 txrc.sband = local->hw.wiphy->bands[band];
4360 txrc.bss_conf = &sdata->vif.bss_conf;
4361 txrc.skb = skb;
4362 txrc.reported_rate.idx = -1;
4363 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4364 txrc.bss = true;
4365 rate_control_get_rate(sdata, NULL, &txrc);
4366
4367 info->control.vif = vif;
4368
4369 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4370 IEEE80211_TX_CTL_ASSIGN_SEQ |
4371 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4372 out:
4373 rcu_read_unlock();
4374 return skb;
4375
4376 }
4377
4378 struct sk_buff *
4379 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4380 struct ieee80211_vif *vif,
4381 struct ieee80211_mutable_offsets *offs)
4382 {
4383 return __ieee80211_beacon_get(hw, vif, offs, true);
4384 }
4385 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4386
4387 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4388 struct ieee80211_vif *vif,
4389 u16 *tim_offset, u16 *tim_length)
4390 {
4391 struct ieee80211_mutable_offsets offs = {};
4392 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4393 struct sk_buff *copy;
4394 struct ieee80211_supported_band *sband;
4395 int shift;
4396
4397 if (!bcn)
4398 return bcn;
4399
4400 if (tim_offset)
4401 *tim_offset = offs.tim_offset;
4402
4403 if (tim_length)
4404 *tim_length = offs.tim_length;
4405
4406 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4407 !hw_to_local(hw)->monitors)
4408 return bcn;
4409
4410 /* send a copy to monitor interfaces */
4411 copy = skb_copy(bcn, GFP_ATOMIC);
4412 if (!copy)
4413 return bcn;
4414
4415 shift = ieee80211_vif_get_shift(vif);
4416 sband = ieee80211_get_sband(vif_to_sdata(vif));
4417 if (!sband)
4418 return bcn;
4419
4420 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4421
4422 return bcn;
4423 }
4424 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4425
4426 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4427 struct ieee80211_vif *vif)
4428 {
4429 struct ieee80211_if_ap *ap = NULL;
4430 struct sk_buff *skb = NULL;
4431 struct probe_resp *presp = NULL;
4432 struct ieee80211_hdr *hdr;
4433 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4434
4435 if (sdata->vif.type != NL80211_IFTYPE_AP)
4436 return NULL;
4437
4438 rcu_read_lock();
4439
4440 ap = &sdata->u.ap;
4441 presp = rcu_dereference(ap->probe_resp);
4442 if (!presp)
4443 goto out;
4444
4445 skb = dev_alloc_skb(presp->len);
4446 if (!skb)
4447 goto out;
4448
4449 skb_put_data(skb, presp->data, presp->len);
4450
4451 hdr = (struct ieee80211_hdr *) skb->data;
4452 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4453
4454 out:
4455 rcu_read_unlock();
4456 return skb;
4457 }
4458 EXPORT_SYMBOL(ieee80211_proberesp_get);
4459
4460 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4461 struct ieee80211_vif *vif)
4462 {
4463 struct ieee80211_sub_if_data *sdata;
4464 struct ieee80211_if_managed *ifmgd;
4465 struct ieee80211_pspoll *pspoll;
4466 struct ieee80211_local *local;
4467 struct sk_buff *skb;
4468
4469 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4470 return NULL;
4471
4472 sdata = vif_to_sdata(vif);
4473 ifmgd = &sdata->u.mgd;
4474 local = sdata->local;
4475
4476 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4477 if (!skb)
4478 return NULL;
4479
4480 skb_reserve(skb, local->hw.extra_tx_headroom);
4481
4482 pspoll = skb_put_zero(skb, sizeof(*pspoll));
4483 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4484 IEEE80211_STYPE_PSPOLL);
4485 pspoll->aid = cpu_to_le16(ifmgd->aid);
4486
4487 /* aid in PS-Poll has its two MSBs each set to 1 */
4488 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4489
4490 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4491 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4492
4493 return skb;
4494 }
4495 EXPORT_SYMBOL(ieee80211_pspoll_get);
4496
4497 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4498 struct ieee80211_vif *vif,
4499 bool qos_ok)
4500 {
4501 struct ieee80211_hdr_3addr *nullfunc;
4502 struct ieee80211_sub_if_data *sdata;
4503 struct ieee80211_if_managed *ifmgd;
4504 struct ieee80211_local *local;
4505 struct sk_buff *skb;
4506 bool qos = false;
4507
4508 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4509 return NULL;
4510
4511 sdata = vif_to_sdata(vif);
4512 ifmgd = &sdata->u.mgd;
4513 local = sdata->local;
4514
4515 if (qos_ok) {
4516 struct sta_info *sta;
4517
4518 rcu_read_lock();
4519 sta = sta_info_get(sdata, ifmgd->bssid);
4520 qos = sta && sta->sta.wme;
4521 rcu_read_unlock();
4522 }
4523
4524 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4525 sizeof(*nullfunc) + 2);
4526 if (!skb)
4527 return NULL;
4528
4529 skb_reserve(skb, local->hw.extra_tx_headroom);
4530
4531 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4532 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4533 IEEE80211_STYPE_NULLFUNC |
4534 IEEE80211_FCTL_TODS);
4535 if (qos) {
4536 __le16 qos = cpu_to_le16(7);
4537
4538 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
4539 IEEE80211_STYPE_NULLFUNC) !=
4540 IEEE80211_STYPE_QOS_NULLFUNC);
4541 nullfunc->frame_control |=
4542 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
4543 skb->priority = 7;
4544 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
4545 skb_put_data(skb, &qos, sizeof(qos));
4546 }
4547
4548 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4549 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4550 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4551
4552 return skb;
4553 }
4554 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4555
4556 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4557 const u8 *src_addr,
4558 const u8 *ssid, size_t ssid_len,
4559 size_t tailroom)
4560 {
4561 struct ieee80211_local *local = hw_to_local(hw);
4562 struct ieee80211_hdr_3addr *hdr;
4563 struct sk_buff *skb;
4564 size_t ie_ssid_len;
4565 u8 *pos;
4566
4567 ie_ssid_len = 2 + ssid_len;
4568
4569 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4570 ie_ssid_len + tailroom);
4571 if (!skb)
4572 return NULL;
4573
4574 skb_reserve(skb, local->hw.extra_tx_headroom);
4575
4576 hdr = skb_put_zero(skb, sizeof(*hdr));
4577 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4578 IEEE80211_STYPE_PROBE_REQ);
4579 eth_broadcast_addr(hdr->addr1);
4580 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4581 eth_broadcast_addr(hdr->addr3);
4582
4583 pos = skb_put(skb, ie_ssid_len);
4584 *pos++ = WLAN_EID_SSID;
4585 *pos++ = ssid_len;
4586 if (ssid_len)
4587 memcpy(pos, ssid, ssid_len);
4588 pos += ssid_len;
4589
4590 return skb;
4591 }
4592 EXPORT_SYMBOL(ieee80211_probereq_get);
4593
4594 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4595 const void *frame, size_t frame_len,
4596 const struct ieee80211_tx_info *frame_txctl,
4597 struct ieee80211_rts *rts)
4598 {
4599 const struct ieee80211_hdr *hdr = frame;
4600
4601 rts->frame_control =
4602 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4603 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4604 frame_txctl);
4605 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4606 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4607 }
4608 EXPORT_SYMBOL(ieee80211_rts_get);
4609
4610 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4611 const void *frame, size_t frame_len,
4612 const struct ieee80211_tx_info *frame_txctl,
4613 struct ieee80211_cts *cts)
4614 {
4615 const struct ieee80211_hdr *hdr = frame;
4616
4617 cts->frame_control =
4618 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4619 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4620 frame_len, frame_txctl);
4621 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4622 }
4623 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4624
4625 struct sk_buff *
4626 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4627 struct ieee80211_vif *vif)
4628 {
4629 struct ieee80211_local *local = hw_to_local(hw);
4630 struct sk_buff *skb = NULL;
4631 struct ieee80211_tx_data tx;
4632 struct ieee80211_sub_if_data *sdata;
4633 struct ps_data *ps;
4634 struct ieee80211_tx_info *info;
4635 struct ieee80211_chanctx_conf *chanctx_conf;
4636
4637 sdata = vif_to_sdata(vif);
4638
4639 rcu_read_lock();
4640 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4641
4642 if (!chanctx_conf)
4643 goto out;
4644
4645 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4646 struct beacon_data *beacon =
4647 rcu_dereference(sdata->u.ap.beacon);
4648
4649 if (!beacon || !beacon->head)
4650 goto out;
4651
4652 ps = &sdata->u.ap.ps;
4653 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4654 ps = &sdata->u.mesh.ps;
4655 } else {
4656 goto out;
4657 }
4658
4659 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4660 goto out; /* send buffered bc/mc only after DTIM beacon */
4661
4662 while (1) {
4663 skb = skb_dequeue(&ps->bc_buf);
4664 if (!skb)
4665 goto out;
4666 local->total_ps_buffered--;
4667
4668 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4669 struct ieee80211_hdr *hdr =
4670 (struct ieee80211_hdr *) skb->data;
4671 /* more buffered multicast/broadcast frames ==> set
4672 * MoreData flag in IEEE 802.11 header to inform PS
4673 * STAs */
4674 hdr->frame_control |=
4675 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4676 }
4677
4678 if (sdata->vif.type == NL80211_IFTYPE_AP)
4679 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4680 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4681 break;
4682 ieee80211_free_txskb(hw, skb);
4683 }
4684
4685 info = IEEE80211_SKB_CB(skb);
4686
4687 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4688 info->band = chanctx_conf->def.chan->band;
4689
4690 if (invoke_tx_handlers(&tx))
4691 skb = NULL;
4692 out:
4693 rcu_read_unlock();
4694
4695 return skb;
4696 }
4697 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4698
4699 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4700 {
4701 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4702 struct ieee80211_sub_if_data *sdata = sta->sdata;
4703 struct ieee80211_local *local = sdata->local;
4704 int ret;
4705 u32 queues;
4706
4707 lockdep_assert_held(&local->sta_mtx);
4708
4709 /* only some cases are supported right now */
4710 switch (sdata->vif.type) {
4711 case NL80211_IFTYPE_STATION:
4712 case NL80211_IFTYPE_AP:
4713 case NL80211_IFTYPE_AP_VLAN:
4714 break;
4715 default:
4716 WARN_ON(1);
4717 return -EINVAL;
4718 }
4719
4720 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4721 return -EINVAL;
4722
4723 if (sta->reserved_tid == tid) {
4724 ret = 0;
4725 goto out;
4726 }
4727
4728 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4729 sdata_err(sdata, "TID reservation already active\n");
4730 ret = -EALREADY;
4731 goto out;
4732 }
4733
4734 ieee80211_stop_vif_queues(sdata->local, sdata,
4735 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4736
4737 synchronize_net();
4738
4739 /* Tear down BA sessions so we stop aggregating on this TID */
4740 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4741 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4742 __ieee80211_stop_tx_ba_session(sta, tid,
4743 AGG_STOP_LOCAL_REQUEST);
4744 }
4745
4746 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4747 __ieee80211_flush_queues(local, sdata, queues, false);
4748
4749 sta->reserved_tid = tid;
4750
4751 ieee80211_wake_vif_queues(local, sdata,
4752 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4753
4754 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4755 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4756
4757 ret = 0;
4758 out:
4759 return ret;
4760 }
4761 EXPORT_SYMBOL(ieee80211_reserve_tid);
4762
4763 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4764 {
4765 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4766 struct ieee80211_sub_if_data *sdata = sta->sdata;
4767
4768 lockdep_assert_held(&sdata->local->sta_mtx);
4769
4770 /* only some cases are supported right now */
4771 switch (sdata->vif.type) {
4772 case NL80211_IFTYPE_STATION:
4773 case NL80211_IFTYPE_AP:
4774 case NL80211_IFTYPE_AP_VLAN:
4775 break;
4776 default:
4777 WARN_ON(1);
4778 return;
4779 }
4780
4781 if (tid != sta->reserved_tid) {
4782 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4783 return;
4784 }
4785
4786 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4787 }
4788 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4789
4790 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4791 struct sk_buff *skb, int tid,
4792 enum nl80211_band band)
4793 {
4794 int ac = ieee80211_ac_from_tid(tid);
4795
4796 skb_reset_mac_header(skb);
4797 skb_set_queue_mapping(skb, ac);
4798 skb->priority = tid;
4799
4800 skb->dev = sdata->dev;
4801
4802 /*
4803 * The other path calling ieee80211_xmit is from the tasklet,
4804 * and while we can handle concurrent transmissions locking
4805 * requirements are that we do not come into tx with bhs on.
4806 */
4807 local_bh_disable();
4808 IEEE80211_SKB_CB(skb)->band = band;
4809 ieee80211_xmit(sdata, NULL, skb);
4810 local_bh_enable();
4811 }
4812
4813 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
4814 const u8 *buf, size_t len,
4815 const u8 *dest, __be16 proto, bool unencrypted)
4816 {
4817 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4818 struct ieee80211_local *local = sdata->local;
4819 struct sk_buff *skb;
4820 struct ethhdr *ehdr;
4821 u32 flags;
4822
4823 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
4824 * or Pre-Authentication
4825 */
4826 if (proto != sdata->control_port_protocol &&
4827 proto != cpu_to_be16(ETH_P_PREAUTH))
4828 return -EINVAL;
4829
4830 if (unencrypted)
4831 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT;
4832 else
4833 flags = 0;
4834
4835 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4836 sizeof(struct ethhdr) + len);
4837 if (!skb)
4838 return -ENOMEM;
4839
4840 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
4841
4842 skb_put_data(skb, buf, len);
4843
4844 ehdr = skb_push(skb, sizeof(struct ethhdr));
4845 memcpy(ehdr->h_dest, dest, ETH_ALEN);
4846 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
4847 ehdr->h_proto = proto;
4848
4849 skb->dev = dev;
4850 skb->protocol = htons(ETH_P_802_3);
4851 skb_reset_network_header(skb);
4852 skb_reset_mac_header(skb);
4853
4854 local_bh_disable();
4855 __ieee80211_subif_start_xmit(skb, skb->dev, flags);
4856 local_bh_enable();
4857
4858 return 0;
4859 }
4860
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