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Merge tag 'regmap-fix-v4.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / net / mac80211 / tx.c
blob1c56abc496272bb58d71639975e4706c266f2066
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 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 *
13 * Transmit and frame generation functions.
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/bitmap.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <net/net_namespace.h>
24 #include <net/ieee80211_radiotap.h>
25 #include <net/cfg80211.h>
26 #include <net/mac80211.h>
27 #include <net/codel.h>
28 #include <net/codel_impl.h>
29 #include <asm/unaligned.h>
30 #include <net/fq_impl.h>
31
32 #include "ieee80211_i.h"
33 #include "driver-ops.h"
34 #include "led.h"
35 #include "mesh.h"
36 #include "wep.h"
37 #include "wpa.h"
38 #include "wme.h"
39 #include "rate.h"
40
41 /* misc utils */
42
43 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
44 {
45 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
46
47 u64_stats_update_begin(&tstats->syncp);
48 tstats->tx_packets++;
49 tstats->tx_bytes += len;
50 u64_stats_update_end(&tstats->syncp);
51 }
52
53 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
54 struct sk_buff *skb, int group_addr,
55 int next_frag_len)
56 {
57 int rate, mrate, erp, dur, i, shift = 0;
58 struct ieee80211_rate *txrate;
59 struct ieee80211_local *local = tx->local;
60 struct ieee80211_supported_band *sband;
61 struct ieee80211_hdr *hdr;
62 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
63 struct ieee80211_chanctx_conf *chanctx_conf;
64 u32 rate_flags = 0;
65
66 rcu_read_lock();
67 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
68 if (chanctx_conf) {
69 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
70 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
71 }
72 rcu_read_unlock();
73
74 /* assume HW handles this */
75 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
76 return 0;
77
78 /* uh huh? */
79 if (WARN_ON_ONCE(tx->rate.idx < 0))
80 return 0;
81
82 sband = local->hw.wiphy->bands[info->band];
83 txrate = &sband->bitrates[tx->rate.idx];
84
85 erp = txrate->flags & IEEE80211_RATE_ERP_G;
86
87 /*
88 * data and mgmt (except PS Poll):
89 * - during CFP: 32768
90 * - during contention period:
91 * if addr1 is group address: 0
92 * if more fragments = 0 and addr1 is individual address: time to
93 * transmit one ACK plus SIFS
94 * if more fragments = 1 and addr1 is individual address: time to
95 * transmit next fragment plus 2 x ACK plus 3 x SIFS
96 *
97 * IEEE 802.11, 9.6:
98 * - control response frame (CTS or ACK) shall be transmitted using the
99 * same rate as the immediately previous frame in the frame exchange
100 * sequence, if this rate belongs to the PHY mandatory rates, or else
101 * at the highest possible rate belonging to the PHY rates in the
102 * BSSBasicRateSet
103 */
104 hdr = (struct ieee80211_hdr *)skb->data;
105 if (ieee80211_is_ctl(hdr->frame_control)) {
106 /* TODO: These control frames are not currently sent by
107 * mac80211, but should they be implemented, this function
108 * needs to be updated to support duration field calculation.
109 *
110 * RTS: time needed to transmit pending data/mgmt frame plus
111 * one CTS frame plus one ACK frame plus 3 x SIFS
112 * CTS: duration of immediately previous RTS minus time
113 * required to transmit CTS and its SIFS
114 * ACK: 0 if immediately previous directed data/mgmt had
115 * more=0, with more=1 duration in ACK frame is duration
116 * from previous frame minus time needed to transmit ACK
117 * and its SIFS
118 * PS Poll: BIT(15) | BIT(14) | aid
119 */
120 return 0;
121 }
122
123 /* data/mgmt */
124 if (0 /* FIX: data/mgmt during CFP */)
125 return cpu_to_le16(32768);
126
127 if (group_addr) /* Group address as the destination - no ACK */
128 return 0;
129
130 /* Individual destination address:
131 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
132 * CTS and ACK frames shall be transmitted using the highest rate in
133 * basic rate set that is less than or equal to the rate of the
134 * immediately previous frame and that is using the same modulation
135 * (CCK or OFDM). If no basic rate set matches with these requirements,
136 * the highest mandatory rate of the PHY that is less than or equal to
137 * the rate of the previous frame is used.
138 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
139 */
140 rate = -1;
141 /* use lowest available if everything fails */
142 mrate = sband->bitrates[0].bitrate;
143 for (i = 0; i < sband->n_bitrates; i++) {
144 struct ieee80211_rate *r = &sband->bitrates[i];
145
146 if (r->bitrate > txrate->bitrate)
147 break;
148
149 if ((rate_flags & r->flags) != rate_flags)
150 continue;
151
152 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
153 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
154
155 switch (sband->band) {
156 case NL80211_BAND_2GHZ: {
157 u32 flag;
158 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
159 flag = IEEE80211_RATE_MANDATORY_G;
160 else
161 flag = IEEE80211_RATE_MANDATORY_B;
162 if (r->flags & flag)
163 mrate = r->bitrate;
164 break;
165 }
166 case NL80211_BAND_5GHZ:
167 if (r->flags & IEEE80211_RATE_MANDATORY_A)
168 mrate = r->bitrate;
169 break;
170 case NL80211_BAND_60GHZ:
171 /* TODO, for now fall through */
172 case NUM_NL80211_BANDS:
173 WARN_ON(1);
174 break;
175 }
176 }
177 if (rate == -1) {
178 /* No matching basic rate found; use highest suitable mandatory
179 * PHY rate */
180 rate = DIV_ROUND_UP(mrate, 1 << shift);
181 }
182
183 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
184 if (ieee80211_is_data_qos(hdr->frame_control) &&
185 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
186 dur = 0;
187 else
188 /* Time needed to transmit ACK
189 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
190 * to closest integer */
191 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
192 tx->sdata->vif.bss_conf.use_short_preamble,
193 shift);
194
195 if (next_frag_len) {
196 /* Frame is fragmented: duration increases with time needed to
197 * transmit next fragment plus ACK and 2 x SIFS. */
198 dur *= 2; /* ACK + SIFS */
199 /* next fragment */
200 dur += ieee80211_frame_duration(sband->band, next_frag_len,
201 txrate->bitrate, erp,
202 tx->sdata->vif.bss_conf.use_short_preamble,
203 shift);
204 }
205
206 return cpu_to_le16(dur);
207 }
208
209 /* tx handlers */
210 static ieee80211_tx_result debug_noinline
211 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
212 {
213 struct ieee80211_local *local = tx->local;
214 struct ieee80211_if_managed *ifmgd;
215
216 /* driver doesn't support power save */
217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
218 return TX_CONTINUE;
219
220 /* hardware does dynamic power save */
221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
222 return TX_CONTINUE;
223
224 /* dynamic power save disabled */
225 if (local->hw.conf.dynamic_ps_timeout <= 0)
226 return TX_CONTINUE;
227
228 /* we are scanning, don't enable power save */
229 if (local->scanning)
230 return TX_CONTINUE;
231
232 if (!local->ps_sdata)
233 return TX_CONTINUE;
234
235 /* No point if we're going to suspend */
236 if (local->quiescing)
237 return TX_CONTINUE;
238
239 /* dynamic ps is supported only in managed mode */
240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
241 return TX_CONTINUE;
242
243 ifmgd = &tx->sdata->u.mgd;
244
245 /*
246 * Don't wakeup from power save if u-apsd is enabled, voip ac has
247 * u-apsd enabled and the frame is in voip class. This effectively
248 * means that even if all access categories have u-apsd enabled, in
249 * practise u-apsd is only used with the voip ac. This is a
250 * workaround for the case when received voip class packets do not
251 * have correct qos tag for some reason, due the network or the
252 * peer application.
253 *
254 * Note: ifmgd->uapsd_queues access is racy here. If the value is
255 * changed via debugfs, user needs to reassociate manually to have
256 * everything in sync.
257 */
258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
261 return TX_CONTINUE;
262
263 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
264 ieee80211_stop_queues_by_reason(&local->hw,
265 IEEE80211_MAX_QUEUE_MAP,
266 IEEE80211_QUEUE_STOP_REASON_PS,
267 false);
268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
269 ieee80211_queue_work(&local->hw,
270 &local->dynamic_ps_disable_work);
271 }
272
273 /* Don't restart the timer if we're not disassociated */
274 if (!ifmgd->associated)
275 return TX_CONTINUE;
276
277 mod_timer(&local->dynamic_ps_timer, jiffies +
278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
279
280 return TX_CONTINUE;
281 }
282
283 static ieee80211_tx_result debug_noinline
284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
285 {
286
287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
289 bool assoc = false;
290
291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
292 return TX_CONTINUE;
293
294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
296 !ieee80211_is_probe_req(hdr->frame_control) &&
297 !ieee80211_is_nullfunc(hdr->frame_control))
298 /*
299 * When software scanning only nullfunc frames (to notify
300 * the sleep state to the AP) and probe requests (for the
301 * active scan) are allowed, all other frames should not be
302 * sent and we should not get here, but if we do
303 * nonetheless, drop them to avoid sending them
304 * off-channel. See the link below and
305 * ieee80211_start_scan() for more.
306 *
307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
308 */
309 return TX_DROP;
310
311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
312 return TX_CONTINUE;
313
314 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
315 return TX_CONTINUE;
316
317 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
318 return TX_CONTINUE;
319
320 if (tx->sta)
321 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
322
323 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
324 if (unlikely(!assoc &&
325 ieee80211_is_data(hdr->frame_control))) {
326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
327 sdata_info(tx->sdata,
328 "dropped data frame to not associated station %pM\n",
329 hdr->addr1);
330 #endif
331 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
332 return TX_DROP;
333 }
334 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
335 ieee80211_is_data(hdr->frame_control) &&
336 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
337 /*
338 * No associated STAs - no need to send multicast
339 * frames.
340 */
341 return TX_DROP;
342 }
343
344 return TX_CONTINUE;
345 }
346
347 /* This function is called whenever the AP is about to exceed the maximum limit
348 * of buffered frames for power saving STAs. This situation should not really
349 * happen often during normal operation, so dropping the oldest buffered packet
350 * from each queue should be OK to make some room for new frames. */
351 static void purge_old_ps_buffers(struct ieee80211_local *local)
352 {
353 int total = 0, purged = 0;
354 struct sk_buff *skb;
355 struct ieee80211_sub_if_data *sdata;
356 struct sta_info *sta;
357
358 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
359 struct ps_data *ps;
360
361 if (sdata->vif.type == NL80211_IFTYPE_AP)
362 ps = &sdata->u.ap.ps;
363 else if (ieee80211_vif_is_mesh(&sdata->vif))
364 ps = &sdata->u.mesh.ps;
365 else
366 continue;
367
368 skb = skb_dequeue(&ps->bc_buf);
369 if (skb) {
370 purged++;
371 ieee80211_free_txskb(&local->hw, skb);
372 }
373 total += skb_queue_len(&ps->bc_buf);
374 }
375
376 /*
377 * Drop one frame from each station from the lowest-priority
378 * AC that has frames at all.
379 */
380 list_for_each_entry_rcu(sta, &local->sta_list, list) {
381 int ac;
382
383 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
384 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
385 total += skb_queue_len(&sta->ps_tx_buf[ac]);
386 if (skb) {
387 purged++;
388 ieee80211_free_txskb(&local->hw, skb);
389 break;
390 }
391 }
392 }
393
394 local->total_ps_buffered = total;
395 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
396 }
397
398 static ieee80211_tx_result
399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
400 {
401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
403 struct ps_data *ps;
404
405 /*
406 * broadcast/multicast frame
407 *
408 * If any of the associated/peer stations is in power save mode,
409 * the frame is buffered to be sent after DTIM beacon frame.
410 * This is done either by the hardware or us.
411 */
412
413 /* powersaving STAs currently only in AP/VLAN/mesh mode */
414 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
415 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
416 if (!tx->sdata->bss)
417 return TX_CONTINUE;
418
419 ps = &tx->sdata->bss->ps;
420 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
421 ps = &tx->sdata->u.mesh.ps;
422 } else {
423 return TX_CONTINUE;
424 }
425
426
427 /* no buffering for ordered frames */
428 if (ieee80211_has_order(hdr->frame_control))
429 return TX_CONTINUE;
430
431 if (ieee80211_is_probe_req(hdr->frame_control))
432 return TX_CONTINUE;
433
434 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
435 info->hw_queue = tx->sdata->vif.cab_queue;
436
437 /* no stations in PS mode */
438 if (!atomic_read(&ps->num_sta_ps))
439 return TX_CONTINUE;
440
441 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
442
443 /* device releases frame after DTIM beacon */
444 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
445 return TX_CONTINUE;
446
447 /* buffered in mac80211 */
448 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
449 purge_old_ps_buffers(tx->local);
450
451 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
452 ps_dbg(tx->sdata,
453 "BC TX buffer full - dropping the oldest frame\n");
454 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
455 } else
456 tx->local->total_ps_buffered++;
457
458 skb_queue_tail(&ps->bc_buf, tx->skb);
459
460 return TX_QUEUED;
461 }
462
463 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
464 struct sk_buff *skb)
465 {
466 if (!ieee80211_is_mgmt(fc))
467 return 0;
468
469 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
470 return 0;
471
472 if (!ieee80211_is_robust_mgmt_frame(skb))
473 return 0;
474
475 return 1;
476 }
477
478 static ieee80211_tx_result
479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
480 {
481 struct sta_info *sta = tx->sta;
482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
484 struct ieee80211_local *local = tx->local;
485
486 if (unlikely(!sta))
487 return TX_CONTINUE;
488
489 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
490 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
491 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
492 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
493 int ac = skb_get_queue_mapping(tx->skb);
494
495 if (ieee80211_is_mgmt(hdr->frame_control) &&
496 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
497 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
498 return TX_CONTINUE;
499 }
500
501 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
502 sta->sta.addr, sta->sta.aid, ac);
503 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
504 purge_old_ps_buffers(tx->local);
505
506 /* sync with ieee80211_sta_ps_deliver_wakeup */
507 spin_lock(&sta->ps_lock);
508 /*
509 * STA woke up the meantime and all the frames on ps_tx_buf have
510 * been queued to pending queue. No reordering can happen, go
511 * ahead and Tx the packet.
512 */
513 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
514 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
515 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
516 spin_unlock(&sta->ps_lock);
517 return TX_CONTINUE;
518 }
519
520 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
521 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
522 ps_dbg(tx->sdata,
523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
524 sta->sta.addr, ac);
525 ieee80211_free_txskb(&local->hw, old);
526 } else
527 tx->local->total_ps_buffered++;
528
529 info->control.jiffies = jiffies;
530 info->control.vif = &tx->sdata->vif;
531 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
532 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
533 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
534 spin_unlock(&sta->ps_lock);
535
536 if (!timer_pending(&local->sta_cleanup))
537 mod_timer(&local->sta_cleanup,
538 round_jiffies(jiffies +
539 STA_INFO_CLEANUP_INTERVAL));
540
541 /*
542 * We queued up some frames, so the TIM bit might
543 * need to be set, recalculate it.
544 */
545 sta_info_recalc_tim(sta);
546
547 return TX_QUEUED;
548 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
549 ps_dbg(tx->sdata,
550 "STA %pM in PS mode, but polling/in SP -> send frame\n",
551 sta->sta.addr);
552 }
553
554 return TX_CONTINUE;
555 }
556
557 static ieee80211_tx_result debug_noinline
558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
559 {
560 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
561 return TX_CONTINUE;
562
563 if (tx->flags & IEEE80211_TX_UNICAST)
564 return ieee80211_tx_h_unicast_ps_buf(tx);
565 else
566 return ieee80211_tx_h_multicast_ps_buf(tx);
567 }
568
569 static ieee80211_tx_result debug_noinline
570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
571 {
572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
573
574 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
575 if (tx->sdata->control_port_no_encrypt)
576 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
577 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
578 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
579 }
580
581 return TX_CONTINUE;
582 }
583
584 static ieee80211_tx_result debug_noinline
585 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
586 {
587 struct ieee80211_key *key;
588 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
589 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
590
591 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
592 tx->key = NULL;
593 else if (tx->sta &&
594 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
595 tx->key = key;
596 else if (ieee80211_is_group_privacy_action(tx->skb) &&
597 (key = rcu_dereference(tx->sdata->default_multicast_key)))
598 tx->key = key;
599 else if (ieee80211_is_mgmt(hdr->frame_control) &&
600 is_multicast_ether_addr(hdr->addr1) &&
601 ieee80211_is_robust_mgmt_frame(tx->skb) &&
602 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
603 tx->key = key;
604 else if (is_multicast_ether_addr(hdr->addr1) &&
605 (key = rcu_dereference(tx->sdata->default_multicast_key)))
606 tx->key = key;
607 else if (!is_multicast_ether_addr(hdr->addr1) &&
608 (key = rcu_dereference(tx->sdata->default_unicast_key)))
609 tx->key = key;
610 else
611 tx->key = NULL;
612
613 if (tx->key) {
614 bool skip_hw = false;
615
616 /* TODO: add threshold stuff again */
617
618 switch (tx->key->conf.cipher) {
619 case WLAN_CIPHER_SUITE_WEP40:
620 case WLAN_CIPHER_SUITE_WEP104:
621 case WLAN_CIPHER_SUITE_TKIP:
622 if (!ieee80211_is_data_present(hdr->frame_control))
623 tx->key = NULL;
624 break;
625 case WLAN_CIPHER_SUITE_CCMP:
626 case WLAN_CIPHER_SUITE_CCMP_256:
627 case WLAN_CIPHER_SUITE_GCMP:
628 case WLAN_CIPHER_SUITE_GCMP_256:
629 if (!ieee80211_is_data_present(hdr->frame_control) &&
630 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
631 tx->skb) &&
632 !ieee80211_is_group_privacy_action(tx->skb))
633 tx->key = NULL;
634 else
635 skip_hw = (tx->key->conf.flags &
636 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
637 ieee80211_is_mgmt(hdr->frame_control);
638 break;
639 case WLAN_CIPHER_SUITE_AES_CMAC:
640 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
641 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
643 if (!ieee80211_is_mgmt(hdr->frame_control))
644 tx->key = NULL;
645 break;
646 }
647
648 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
649 !ieee80211_is_deauth(hdr->frame_control)))
650 return TX_DROP;
651
652 if (!skip_hw && tx->key &&
653 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
654 info->control.hw_key = &tx->key->conf;
655 }
656
657 return TX_CONTINUE;
658 }
659
660 static ieee80211_tx_result debug_noinline
661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
662 {
663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
664 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
665 struct ieee80211_supported_band *sband;
666 u32 len;
667 struct ieee80211_tx_rate_control txrc;
668 struct ieee80211_sta_rates *ratetbl = NULL;
669 bool assoc = false;
670
671 memset(&txrc, 0, sizeof(txrc));
672
673 sband = tx->local->hw.wiphy->bands[info->band];
674
675 len = min_t(u32, tx->skb->len + FCS_LEN,
676 tx->local->hw.wiphy->frag_threshold);
677
678 /* set up the tx rate control struct we give the RC algo */
679 txrc.hw = &tx->local->hw;
680 txrc.sband = sband;
681 txrc.bss_conf = &tx->sdata->vif.bss_conf;
682 txrc.skb = tx->skb;
683 txrc.reported_rate.idx = -1;
684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
685 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
686 txrc.max_rate_idx = -1;
687 else
688 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
689
690 if (tx->sdata->rc_has_mcs_mask[info->band])
691 txrc.rate_idx_mcs_mask =
692 tx->sdata->rc_rateidx_mcs_mask[info->band];
693
694 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
695 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
696 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
697 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
698
699 /* set up RTS protection if desired */
700 if (len > tx->local->hw.wiphy->rts_threshold) {
701 txrc.rts = true;
702 }
703
704 info->control.use_rts = txrc.rts;
705 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
706
707 /*
708 * Use short preamble if the BSS can handle it, but not for
709 * management frames unless we know the receiver can handle
710 * that -- the management frame might be to a station that
711 * just wants a probe response.
712 */
713 if (tx->sdata->vif.bss_conf.use_short_preamble &&
714 (ieee80211_is_data(hdr->frame_control) ||
715 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
716 txrc.short_preamble = true;
717
718 info->control.short_preamble = txrc.short_preamble;
719
720 /* don't ask rate control when rate already injected via radiotap */
721 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
722 return TX_CONTINUE;
723
724 if (tx->sta)
725 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
726
727 /*
728 * Lets not bother rate control if we're associated and cannot
729 * talk to the sta. This should not happen.
730 */
731 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
732 !rate_usable_index_exists(sband, &tx->sta->sta),
733 "%s: Dropped data frame as no usable bitrate found while "
734 "scanning and associated. Target station: "
735 "%pM on %d GHz band\n",
736 tx->sdata->name, hdr->addr1,
737 info->band ? 5 : 2))
738 return TX_DROP;
739
740 /*
741 * If we're associated with the sta at this point we know we can at
742 * least send the frame at the lowest bit rate.
743 */
744 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
745
746 if (tx->sta && !info->control.skip_table)
747 ratetbl = rcu_dereference(tx->sta->sta.rates);
748
749 if (unlikely(info->control.rates[0].idx < 0)) {
750 if (ratetbl) {
751 struct ieee80211_tx_rate rate = {
752 .idx = ratetbl->rate[0].idx,
753 .flags = ratetbl->rate[0].flags,
754 .count = ratetbl->rate[0].count
755 };
756
757 if (ratetbl->rate[0].idx < 0)
758 return TX_DROP;
759
760 tx->rate = rate;
761 } else {
762 return TX_DROP;
763 }
764 } else {
765 tx->rate = info->control.rates[0];
766 }
767
768 if (txrc.reported_rate.idx < 0) {
769 txrc.reported_rate = tx->rate;
770 if (tx->sta && ieee80211_is_data(hdr->frame_control))
771 tx->sta->tx_stats.last_rate = txrc.reported_rate;
772 } else if (tx->sta)
773 tx->sta->tx_stats.last_rate = txrc.reported_rate;
774
775 if (ratetbl)
776 return TX_CONTINUE;
777
778 if (unlikely(!info->control.rates[0].count))
779 info->control.rates[0].count = 1;
780
781 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
782 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
783 info->control.rates[0].count = 1;
784
785 return TX_CONTINUE;
786 }
787
788 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
789 {
790 u16 *seq = &sta->tid_seq[tid];
791 __le16 ret = cpu_to_le16(*seq);
792
793 /* Increase the sequence number. */
794 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
795
796 return ret;
797 }
798
799 static ieee80211_tx_result debug_noinline
800 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
801 {
802 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
803 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
804 u8 *qc;
805 int tid;
806
807 /*
808 * Packet injection may want to control the sequence
809 * number, if we have no matching interface then we
810 * neither assign one ourselves nor ask the driver to.
811 */
812 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
813 return TX_CONTINUE;
814
815 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
816 return TX_CONTINUE;
817
818 if (ieee80211_hdrlen(hdr->frame_control) < 24)
819 return TX_CONTINUE;
820
821 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
822 return TX_CONTINUE;
823
824 /*
825 * Anything but QoS data that has a sequence number field
826 * (is long enough) gets a sequence number from the global
827 * counter. QoS data frames with a multicast destination
828 * also use the global counter (802.11-2012 9.3.2.10).
829 */
830 if (!ieee80211_is_data_qos(hdr->frame_control) ||
831 is_multicast_ether_addr(hdr->addr1)) {
832 /* driver should assign sequence number */
833 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
834 /* for pure STA mode without beacons, we can do it */
835 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
836 tx->sdata->sequence_number += 0x10;
837 if (tx->sta)
838 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
839 return TX_CONTINUE;
840 }
841
842 /*
843 * This should be true for injected/management frames only, for
844 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
845 * above since they are not QoS-data frames.
846 */
847 if (!tx->sta)
848 return TX_CONTINUE;
849
850 /* include per-STA, per-TID sequence counter */
851
852 qc = ieee80211_get_qos_ctl(hdr);
853 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
854 tx->sta->tx_stats.msdu[tid]++;
855
856 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
857
858 return TX_CONTINUE;
859 }
860
861 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
862 struct sk_buff *skb, int hdrlen,
863 int frag_threshold)
864 {
865 struct ieee80211_local *local = tx->local;
866 struct ieee80211_tx_info *info;
867 struct sk_buff *tmp;
868 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
869 int pos = hdrlen + per_fragm;
870 int rem = skb->len - hdrlen - per_fragm;
871
872 if (WARN_ON(rem < 0))
873 return -EINVAL;
874
875 /* first fragment was already added to queue by caller */
876
877 while (rem) {
878 int fraglen = per_fragm;
879
880 if (fraglen > rem)
881 fraglen = rem;
882 rem -= fraglen;
883 tmp = dev_alloc_skb(local->tx_headroom +
884 frag_threshold +
885 tx->sdata->encrypt_headroom +
886 IEEE80211_ENCRYPT_TAILROOM);
887 if (!tmp)
888 return -ENOMEM;
889
890 __skb_queue_tail(&tx->skbs, tmp);
891
892 skb_reserve(tmp,
893 local->tx_headroom + tx->sdata->encrypt_headroom);
894
895 /* copy control information */
896 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
897
898 info = IEEE80211_SKB_CB(tmp);
899 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
900 IEEE80211_TX_CTL_FIRST_FRAGMENT);
901
902 if (rem)
903 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
904
905 skb_copy_queue_mapping(tmp, skb);
906 tmp->priority = skb->priority;
907 tmp->dev = skb->dev;
908
909 /* copy header and data */
910 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
911 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
912
913 pos += fraglen;
914 }
915
916 /* adjust first fragment's length */
917 skb_trim(skb, hdrlen + per_fragm);
918 return 0;
919 }
920
921 static ieee80211_tx_result debug_noinline
922 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
923 {
924 struct sk_buff *skb = tx->skb;
925 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
926 struct ieee80211_hdr *hdr = (void *)skb->data;
927 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
928 int hdrlen;
929 int fragnum;
930
931 /* no matter what happens, tx->skb moves to tx->skbs */
932 __skb_queue_tail(&tx->skbs, skb);
933 tx->skb = NULL;
934
935 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
936 return TX_CONTINUE;
937
938 if (tx->local->ops->set_frag_threshold)
939 return TX_CONTINUE;
940
941 /*
942 * Warn when submitting a fragmented A-MPDU frame and drop it.
943 * This scenario is handled in ieee80211_tx_prepare but extra
944 * caution taken here as fragmented ampdu may cause Tx stop.
945 */
946 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
947 return TX_DROP;
948
949 hdrlen = ieee80211_hdrlen(hdr->frame_control);
950
951 /* internal error, why isn't DONTFRAG set? */
952 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
953 return TX_DROP;
954
955 /*
956 * Now fragment the frame. This will allocate all the fragments and
957 * chain them (using skb as the first fragment) to skb->next.
958 * During transmission, we will remove the successfully transmitted
959 * fragments from this list. When the low-level driver rejects one
960 * of the fragments then we will simply pretend to accept the skb
961 * but store it away as pending.
962 */
963 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
964 return TX_DROP;
965
966 /* update duration/seq/flags of fragments */
967 fragnum = 0;
968
969 skb_queue_walk(&tx->skbs, skb) {
970 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
971
972 hdr = (void *)skb->data;
973 info = IEEE80211_SKB_CB(skb);
974
975 if (!skb_queue_is_last(&tx->skbs, skb)) {
976 hdr->frame_control |= morefrags;
977 /*
978 * No multi-rate retries for fragmented frames, that
979 * would completely throw off the NAV at other STAs.
980 */
981 info->control.rates[1].idx = -1;
982 info->control.rates[2].idx = -1;
983 info->control.rates[3].idx = -1;
984 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
985 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
986 } else {
987 hdr->frame_control &= ~morefrags;
988 }
989 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
990 fragnum++;
991 }
992
993 return TX_CONTINUE;
994 }
995
996 static ieee80211_tx_result debug_noinline
997 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
998 {
999 struct sk_buff *skb;
1000 int ac = -1;
1001
1002 if (!tx->sta)
1003 return TX_CONTINUE;
1004
1005 skb_queue_walk(&tx->skbs, skb) {
1006 ac = skb_get_queue_mapping(skb);
1007 tx->sta->tx_stats.bytes[ac] += skb->len;
1008 }
1009 if (ac >= 0)
1010 tx->sta->tx_stats.packets[ac]++;
1011
1012 return TX_CONTINUE;
1013 }
1014
1015 static ieee80211_tx_result debug_noinline
1016 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1017 {
1018 if (!tx->key)
1019 return TX_CONTINUE;
1020
1021 switch (tx->key->conf.cipher) {
1022 case WLAN_CIPHER_SUITE_WEP40:
1023 case WLAN_CIPHER_SUITE_WEP104:
1024 return ieee80211_crypto_wep_encrypt(tx);
1025 case WLAN_CIPHER_SUITE_TKIP:
1026 return ieee80211_crypto_tkip_encrypt(tx);
1027 case WLAN_CIPHER_SUITE_CCMP:
1028 return ieee80211_crypto_ccmp_encrypt(
1029 tx, IEEE80211_CCMP_MIC_LEN);
1030 case WLAN_CIPHER_SUITE_CCMP_256:
1031 return ieee80211_crypto_ccmp_encrypt(
1032 tx, IEEE80211_CCMP_256_MIC_LEN);
1033 case WLAN_CIPHER_SUITE_AES_CMAC:
1034 return ieee80211_crypto_aes_cmac_encrypt(tx);
1035 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1036 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1037 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1038 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1039 return ieee80211_crypto_aes_gmac_encrypt(tx);
1040 case WLAN_CIPHER_SUITE_GCMP:
1041 case WLAN_CIPHER_SUITE_GCMP_256:
1042 return ieee80211_crypto_gcmp_encrypt(tx);
1043 default:
1044 return ieee80211_crypto_hw_encrypt(tx);
1045 }
1046
1047 return TX_DROP;
1048 }
1049
1050 static ieee80211_tx_result debug_noinline
1051 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1052 {
1053 struct sk_buff *skb;
1054 struct ieee80211_hdr *hdr;
1055 int next_len;
1056 bool group_addr;
1057
1058 skb_queue_walk(&tx->skbs, skb) {
1059 hdr = (void *) skb->data;
1060 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1061 break; /* must not overwrite AID */
1062 if (!skb_queue_is_last(&tx->skbs, skb)) {
1063 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1064 next_len = next->len;
1065 } else
1066 next_len = 0;
1067 group_addr = is_multicast_ether_addr(hdr->addr1);
1068
1069 hdr->duration_id =
1070 ieee80211_duration(tx, skb, group_addr, next_len);
1071 }
1072
1073 return TX_CONTINUE;
1074 }
1075
1076 /* actual transmit path */
1077
1078 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1079 struct sk_buff *skb,
1080 struct ieee80211_tx_info *info,
1081 struct tid_ampdu_tx *tid_tx,
1082 int tid)
1083 {
1084 bool queued = false;
1085 bool reset_agg_timer = false;
1086 struct sk_buff *purge_skb = NULL;
1087
1088 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1089 info->flags |= IEEE80211_TX_CTL_AMPDU;
1090 reset_agg_timer = true;
1091 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1092 /*
1093 * nothing -- this aggregation session is being started
1094 * but that might still fail with the driver
1095 */
1096 } else if (!tx->sta->sta.txq[tid]) {
1097 spin_lock(&tx->sta->lock);
1098 /*
1099 * Need to re-check now, because we may get here
1100 *
1101 * 1) in the window during which the setup is actually
1102 * already done, but not marked yet because not all
1103 * packets are spliced over to the driver pending
1104 * queue yet -- if this happened we acquire the lock
1105 * either before or after the splice happens, but
1106 * need to recheck which of these cases happened.
1107 *
1108 * 2) during session teardown, if the OPERATIONAL bit
1109 * was cleared due to the teardown but the pointer
1110 * hasn't been assigned NULL yet (or we loaded it
1111 * before it was assigned) -- in this case it may
1112 * now be NULL which means we should just let the
1113 * packet pass through because splicing the frames
1114 * back is already done.
1115 */
1116 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1117
1118 if (!tid_tx) {
1119 /* do nothing, let packet pass through */
1120 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1121 info->flags |= IEEE80211_TX_CTL_AMPDU;
1122 reset_agg_timer = true;
1123 } else {
1124 queued = true;
1125 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1126 clear_sta_flag(tx->sta, WLAN_STA_SP);
1127 ps_dbg(tx->sta->sdata,
1128 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1129 tx->sta->sta.addr, tx->sta->sta.aid);
1130 }
1131 info->control.vif = &tx->sdata->vif;
1132 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1133 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1134 __skb_queue_tail(&tid_tx->pending, skb);
1135 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1136 purge_skb = __skb_dequeue(&tid_tx->pending);
1137 }
1138 spin_unlock(&tx->sta->lock);
1139
1140 if (purge_skb)
1141 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1142 }
1143
1144 /* reset session timer */
1145 if (reset_agg_timer && tid_tx->timeout)
1146 tid_tx->last_tx = jiffies;
1147
1148 return queued;
1149 }
1150
1151 /*
1152 * initialises @tx
1153 * pass %NULL for the station if unknown, a valid pointer if known
1154 * or an ERR_PTR() if the station is known not to exist
1155 */
1156 static ieee80211_tx_result
1157 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1158 struct ieee80211_tx_data *tx,
1159 struct sta_info *sta, struct sk_buff *skb)
1160 {
1161 struct ieee80211_local *local = sdata->local;
1162 struct ieee80211_hdr *hdr;
1163 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1164 int tid;
1165 u8 *qc;
1166
1167 memset(tx, 0, sizeof(*tx));
1168 tx->skb = skb;
1169 tx->local = local;
1170 tx->sdata = sdata;
1171 __skb_queue_head_init(&tx->skbs);
1172
1173 /*
1174 * If this flag is set to true anywhere, and we get here,
1175 * we are doing the needed processing, so remove the flag
1176 * now.
1177 */
1178 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1179
1180 hdr = (struct ieee80211_hdr *) skb->data;
1181
1182 if (likely(sta)) {
1183 if (!IS_ERR(sta))
1184 tx->sta = sta;
1185 } else {
1186 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1187 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1188 if (!tx->sta && sdata->wdev.use_4addr)
1189 return TX_DROP;
1190 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1191 IEEE80211_TX_CTL_INJECTED) ||
1192 tx->sdata->control_port_protocol == tx->skb->protocol) {
1193 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1194 }
1195 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1196 tx->sta = sta_info_get(sdata, hdr->addr1);
1197 }
1198
1199 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1200 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1201 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1202 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1203 struct tid_ampdu_tx *tid_tx;
1204
1205 qc = ieee80211_get_qos_ctl(hdr);
1206 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1207
1208 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1209 if (tid_tx) {
1210 bool queued;
1211
1212 queued = ieee80211_tx_prep_agg(tx, skb, info,
1213 tid_tx, tid);
1214
1215 if (unlikely(queued))
1216 return TX_QUEUED;
1217 }
1218 }
1219
1220 if (is_multicast_ether_addr(hdr->addr1)) {
1221 tx->flags &= ~IEEE80211_TX_UNICAST;
1222 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1223 } else
1224 tx->flags |= IEEE80211_TX_UNICAST;
1225
1226 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1227 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1228 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1229 info->flags & IEEE80211_TX_CTL_AMPDU)
1230 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1231 }
1232
1233 if (!tx->sta)
1234 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1235 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1236 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1237 ieee80211_check_fast_xmit(tx->sta);
1238 }
1239
1240 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1241
1242 return TX_CONTINUE;
1243 }
1244
1245 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1246 struct ieee80211_vif *vif,
1247 struct ieee80211_sta *pubsta,
1248 struct sk_buff *skb)
1249 {
1250 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1251 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1252 struct ieee80211_txq *txq = NULL;
1253
1254 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1255 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1256 return NULL;
1257
1258 if (!ieee80211_is_data(hdr->frame_control))
1259 return NULL;
1260
1261 if (pubsta) {
1262 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1263
1264 txq = pubsta->txq[tid];
1265 } else if (vif) {
1266 txq = vif->txq;
1267 }
1268
1269 if (!txq)
1270 return NULL;
1271
1272 return to_txq_info(txq);
1273 }
1274
1275 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1276 {
1277 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1278 }
1279
1280 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi)
1281 {
1282 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif;
1283 }
1284
1285 static u32 codel_skb_len_func(const struct sk_buff *skb)
1286 {
1287 return skb->len;
1288 }
1289
1290 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1291 {
1292 const struct ieee80211_tx_info *info;
1293
1294 info = (const struct ieee80211_tx_info *)skb->cb;
1295 return info->control.enqueue_time;
1296 }
1297
1298 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1299 void *ctx)
1300 {
1301 struct ieee80211_local *local;
1302 struct txq_info *txqi;
1303 struct fq *fq;
1304 struct fq_flow *flow;
1305
1306 txqi = ctx;
1307 local = vif_to_sdata(txqi->txq.vif)->local;
1308 fq = &local->fq;
1309
1310 if (cvars == &txqi->def_cvars)
1311 flow = &txqi->def_flow;
1312 else
1313 flow = &fq->flows[cvars - local->cvars];
1314
1315 return fq_flow_dequeue(fq, flow);
1316 }
1317
1318 static void codel_drop_func(struct sk_buff *skb,
1319 void *ctx)
1320 {
1321 struct ieee80211_local *local;
1322 struct ieee80211_hw *hw;
1323 struct txq_info *txqi;
1324
1325 txqi = ctx;
1326 local = vif_to_sdata(txqi->txq.vif)->local;
1327 hw = &local->hw;
1328
1329 ieee80211_free_txskb(hw, skb);
1330 }
1331
1332 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1333 struct fq_tin *tin,
1334 struct fq_flow *flow)
1335 {
1336 struct ieee80211_local *local;
1337 struct txq_info *txqi;
1338 struct codel_vars *cvars;
1339 struct codel_params *cparams;
1340 struct codel_stats *cstats;
1341
1342 local = container_of(fq, struct ieee80211_local, fq);
1343 txqi = container_of(tin, struct txq_info, tin);
1344 cparams = &local->cparams;
1345 cstats = &txqi->cstats;
1346
1347 if (flow == &txqi->def_flow)
1348 cvars = &txqi->def_cvars;
1349 else
1350 cvars = &local->cvars[flow - fq->flows];
1351
1352 return codel_dequeue(txqi,
1353 &flow->backlog,
1354 cparams,
1355 cvars,
1356 cstats,
1357 codel_skb_len_func,
1358 codel_skb_time_func,
1359 codel_drop_func,
1360 codel_dequeue_func);
1361 }
1362
1363 static void fq_skb_free_func(struct fq *fq,
1364 struct fq_tin *tin,
1365 struct fq_flow *flow,
1366 struct sk_buff *skb)
1367 {
1368 struct ieee80211_local *local;
1369
1370 local = container_of(fq, struct ieee80211_local, fq);
1371 ieee80211_free_txskb(&local->hw, skb);
1372 }
1373
1374 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1375 struct fq_tin *tin,
1376 int idx,
1377 struct sk_buff *skb)
1378 {
1379 struct txq_info *txqi;
1380
1381 txqi = container_of(tin, struct txq_info, tin);
1382 return &txqi->def_flow;
1383 }
1384
1385 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1386 struct txq_info *txqi,
1387 struct sk_buff *skb)
1388 {
1389 struct fq *fq = &local->fq;
1390 struct fq_tin *tin = &txqi->tin;
1391
1392 ieee80211_set_skb_enqueue_time(skb);
1393 fq_tin_enqueue(fq, tin, skb,
1394 fq_skb_free_func,
1395 fq_flow_get_default_func);
1396 }
1397
1398 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1399 struct sta_info *sta,
1400 struct txq_info *txqi, int tid)
1401 {
1402 fq_tin_init(&txqi->tin);
1403 fq_flow_init(&txqi->def_flow);
1404 codel_vars_init(&txqi->def_cvars);
1405 codel_stats_init(&txqi->cstats);
1406 __skb_queue_head_init(&txqi->frags);
1407
1408 txqi->txq.vif = &sdata->vif;
1409
1410 if (sta) {
1411 txqi->txq.sta = &sta->sta;
1412 sta->sta.txq[tid] = &txqi->txq;
1413 txqi->txq.tid = tid;
1414 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
1415 } else {
1416 sdata->vif.txq = &txqi->txq;
1417 txqi->txq.tid = 0;
1418 txqi->txq.ac = IEEE80211_AC_BE;
1419 }
1420 }
1421
1422 void ieee80211_txq_purge(struct ieee80211_local *local,
1423 struct txq_info *txqi)
1424 {
1425 struct fq *fq = &local->fq;
1426 struct fq_tin *tin = &txqi->tin;
1427
1428 fq_tin_reset(fq, tin, fq_skb_free_func);
1429 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1430 }
1431
1432 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1433 {
1434 struct fq *fq = &local->fq;
1435 int ret;
1436 int i;
1437 bool supp_vht = false;
1438 enum nl80211_band band;
1439
1440 if (!local->ops->wake_tx_queue)
1441 return 0;
1442
1443 ret = fq_init(fq, 4096);
1444 if (ret)
1445 return ret;
1446
1447 /*
1448 * If the hardware doesn't support VHT, it is safe to limit the maximum
1449 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1450 */
1451 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1452 struct ieee80211_supported_band *sband;
1453
1454 sband = local->hw.wiphy->bands[band];
1455 if (!sband)
1456 continue;
1457
1458 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1459 }
1460
1461 if (!supp_vht)
1462 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1463
1464 codel_params_init(&local->cparams);
1465 local->cparams.interval = MS2TIME(100);
1466 local->cparams.target = MS2TIME(20);
1467 local->cparams.ecn = true;
1468
1469 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1470 GFP_KERNEL);
1471 if (!local->cvars) {
1472 spin_lock_bh(&fq->lock);
1473 fq_reset(fq, fq_skb_free_func);
1474 spin_unlock_bh(&fq->lock);
1475 return -ENOMEM;
1476 }
1477
1478 for (i = 0; i < fq->flows_cnt; i++)
1479 codel_vars_init(&local->cvars[i]);
1480
1481 return 0;
1482 }
1483
1484 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1485 {
1486 struct fq *fq = &local->fq;
1487
1488 if (!local->ops->wake_tx_queue)
1489 return;
1490
1491 kfree(local->cvars);
1492 local->cvars = NULL;
1493
1494 spin_lock_bh(&fq->lock);
1495 fq_reset(fq, fq_skb_free_func);
1496 spin_unlock_bh(&fq->lock);
1497 }
1498
1499 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1500 struct ieee80211_sub_if_data *sdata,
1501 struct sta_info *sta,
1502 struct sk_buff *skb)
1503 {
1504 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1505 struct fq *fq = &local->fq;
1506 struct ieee80211_vif *vif;
1507 struct txq_info *txqi;
1508 struct ieee80211_sta *pubsta;
1509
1510 if (!local->ops->wake_tx_queue ||
1511 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1512 return false;
1513
1514 if (sta && sta->uploaded)
1515 pubsta = &sta->sta;
1516 else
1517 pubsta = NULL;
1518
1519 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1520 sdata = container_of(sdata->bss,
1521 struct ieee80211_sub_if_data, u.ap);
1522
1523 vif = &sdata->vif;
1524 txqi = ieee80211_get_txq(local, vif, pubsta, skb);
1525
1526 if (!txqi)
1527 return false;
1528
1529 info->control.vif = vif;
1530
1531 spin_lock_bh(&fq->lock);
1532 ieee80211_txq_enqueue(local, txqi, skb);
1533 spin_unlock_bh(&fq->lock);
1534
1535 drv_wake_tx_queue(local, txqi);
1536
1537 return true;
1538 }
1539
1540 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1541 struct ieee80211_vif *vif,
1542 struct ieee80211_sta *sta,
1543 struct sk_buff_head *skbs,
1544 bool txpending)
1545 {
1546 struct ieee80211_tx_control control = {};
1547 struct sk_buff *skb, *tmp;
1548 unsigned long flags;
1549
1550 skb_queue_walk_safe(skbs, skb, tmp) {
1551 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1552 int q = info->hw_queue;
1553
1554 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1555 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1556 __skb_unlink(skb, skbs);
1557 ieee80211_free_txskb(&local->hw, skb);
1558 continue;
1559 }
1560 #endif
1561
1562 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1563 if (local->queue_stop_reasons[q] ||
1564 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1565 if (unlikely(info->flags &
1566 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1567 if (local->queue_stop_reasons[q] &
1568 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1569 /*
1570 * Drop off-channel frames if queues
1571 * are stopped for any reason other
1572 * than off-channel operation. Never
1573 * queue them.
1574 */
1575 spin_unlock_irqrestore(
1576 &local->queue_stop_reason_lock,
1577 flags);
1578 ieee80211_purge_tx_queue(&local->hw,
1579 skbs);
1580 return true;
1581 }
1582 } else {
1583
1584 /*
1585 * Since queue is stopped, queue up frames for
1586 * later transmission from the tx-pending
1587 * tasklet when the queue is woken again.
1588 */
1589 if (txpending)
1590 skb_queue_splice_init(skbs,
1591 &local->pending[q]);
1592 else
1593 skb_queue_splice_tail_init(skbs,
1594 &local->pending[q]);
1595
1596 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1597 flags);
1598 return false;
1599 }
1600 }
1601 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1602
1603 info->control.vif = vif;
1604 control.sta = sta;
1605
1606 __skb_unlink(skb, skbs);
1607 drv_tx(local, &control, skb);
1608 }
1609
1610 return true;
1611 }
1612
1613 /*
1614 * Returns false if the frame couldn't be transmitted but was queued instead.
1615 */
1616 static bool __ieee80211_tx(struct ieee80211_local *local,
1617 struct sk_buff_head *skbs, int led_len,
1618 struct sta_info *sta, bool txpending)
1619 {
1620 struct ieee80211_tx_info *info;
1621 struct ieee80211_sub_if_data *sdata;
1622 struct ieee80211_vif *vif;
1623 struct ieee80211_sta *pubsta;
1624 struct sk_buff *skb;
1625 bool result = true;
1626 __le16 fc;
1627
1628 if (WARN_ON(skb_queue_empty(skbs)))
1629 return true;
1630
1631 skb = skb_peek(skbs);
1632 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1633 info = IEEE80211_SKB_CB(skb);
1634 sdata = vif_to_sdata(info->control.vif);
1635 if (sta && !sta->uploaded)
1636 sta = NULL;
1637
1638 if (sta)
1639 pubsta = &sta->sta;
1640 else
1641 pubsta = NULL;
1642
1643 switch (sdata->vif.type) {
1644 case NL80211_IFTYPE_MONITOR:
1645 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1646 vif = &sdata->vif;
1647 break;
1648 }
1649 sdata = rcu_dereference(local->monitor_sdata);
1650 if (sdata) {
1651 vif = &sdata->vif;
1652 info->hw_queue =
1653 vif->hw_queue[skb_get_queue_mapping(skb)];
1654 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1655 ieee80211_purge_tx_queue(&local->hw, skbs);
1656 return true;
1657 } else
1658 vif = NULL;
1659 break;
1660 case NL80211_IFTYPE_AP_VLAN:
1661 sdata = container_of(sdata->bss,
1662 struct ieee80211_sub_if_data, u.ap);
1663 /* fall through */
1664 default:
1665 vif = &sdata->vif;
1666 break;
1667 }
1668
1669 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1670 txpending);
1671
1672 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1673
1674 WARN_ON_ONCE(!skb_queue_empty(skbs));
1675
1676 return result;
1677 }
1678
1679 /*
1680 * Invoke TX handlers, return 0 on success and non-zero if the
1681 * frame was dropped or queued.
1682 *
1683 * The handlers are split into an early and late part. The latter is everything
1684 * that can be sensitive to reordering, and will be deferred to after packets
1685 * are dequeued from the intermediate queues (when they are enabled).
1686 */
1687 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1688 {
1689 ieee80211_tx_result res = TX_DROP;
1690
1691 #define CALL_TXH(txh) \
1692 do { \
1693 res = txh(tx); \
1694 if (res != TX_CONTINUE) \
1695 goto txh_done; \
1696 } while (0)
1697
1698 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1699 CALL_TXH(ieee80211_tx_h_check_assoc);
1700 CALL_TXH(ieee80211_tx_h_ps_buf);
1701 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1702 CALL_TXH(ieee80211_tx_h_select_key);
1703 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1704 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1705
1706 txh_done:
1707 if (unlikely(res == TX_DROP)) {
1708 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1709 if (tx->skb)
1710 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1711 else
1712 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1713 return -1;
1714 } else if (unlikely(res == TX_QUEUED)) {
1715 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1716 return -1;
1717 }
1718
1719 return 0;
1720 }
1721
1722 /*
1723 * Late handlers can be called while the sta lock is held. Handlers that can
1724 * cause packets to be generated will cause deadlock!
1725 */
1726 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1727 {
1728 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1729 ieee80211_tx_result res = TX_CONTINUE;
1730
1731 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1732 __skb_queue_tail(&tx->skbs, tx->skb);
1733 tx->skb = NULL;
1734 goto txh_done;
1735 }
1736
1737 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1738 CALL_TXH(ieee80211_tx_h_sequence);
1739 CALL_TXH(ieee80211_tx_h_fragment);
1740 /* handlers after fragment must be aware of tx info fragmentation! */
1741 CALL_TXH(ieee80211_tx_h_stats);
1742 CALL_TXH(ieee80211_tx_h_encrypt);
1743 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1744 CALL_TXH(ieee80211_tx_h_calculate_duration);
1745 #undef CALL_TXH
1746
1747 txh_done:
1748 if (unlikely(res == TX_DROP)) {
1749 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1750 if (tx->skb)
1751 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1752 else
1753 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1754 return -1;
1755 } else if (unlikely(res == TX_QUEUED)) {
1756 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1757 return -1;
1758 }
1759
1760 return 0;
1761 }
1762
1763 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1764 {
1765 int r = invoke_tx_handlers_early(tx);
1766
1767 if (r)
1768 return r;
1769 return invoke_tx_handlers_late(tx);
1770 }
1771
1772 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1773 struct ieee80211_vif *vif, struct sk_buff *skb,
1774 int band, struct ieee80211_sta **sta)
1775 {
1776 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1777 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1778 struct ieee80211_tx_data tx;
1779 struct sk_buff *skb2;
1780
1781 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1782 return false;
1783
1784 info->band = band;
1785 info->control.vif = vif;
1786 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1787
1788 if (invoke_tx_handlers(&tx))
1789 return false;
1790
1791 if (sta) {
1792 if (tx.sta)
1793 *sta = &tx.sta->sta;
1794 else
1795 *sta = NULL;
1796 }
1797
1798 /* this function isn't suitable for fragmented data frames */
1799 skb2 = __skb_dequeue(&tx.skbs);
1800 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1801 ieee80211_free_txskb(hw, skb2);
1802 ieee80211_purge_tx_queue(hw, &tx.skbs);
1803 return false;
1804 }
1805
1806 return true;
1807 }
1808 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1809
1810 /*
1811 * Returns false if the frame couldn't be transmitted but was queued instead.
1812 */
1813 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1814 struct sta_info *sta, struct sk_buff *skb,
1815 bool txpending)
1816 {
1817 struct ieee80211_local *local = sdata->local;
1818 struct ieee80211_tx_data tx;
1819 ieee80211_tx_result res_prepare;
1820 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1821 bool result = true;
1822 int led_len;
1823
1824 if (unlikely(skb->len < 10)) {
1825 dev_kfree_skb(skb);
1826 return true;
1827 }
1828
1829 /* initialises tx */
1830 led_len = skb->len;
1831 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1832
1833 if (unlikely(res_prepare == TX_DROP)) {
1834 ieee80211_free_txskb(&local->hw, skb);
1835 return true;
1836 } else if (unlikely(res_prepare == TX_QUEUED)) {
1837 return true;
1838 }
1839
1840 /* set up hw_queue value early */
1841 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1842 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1843 info->hw_queue =
1844 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1845
1846 if (invoke_tx_handlers_early(&tx))
1847 return false;
1848
1849 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1850 return true;
1851
1852 if (!invoke_tx_handlers_late(&tx))
1853 result = __ieee80211_tx(local, &tx.skbs, led_len,
1854 tx.sta, txpending);
1855
1856 return result;
1857 }
1858
1859 /* device xmit handlers */
1860
1861 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1862 struct sk_buff *skb,
1863 int head_need, bool may_encrypt)
1864 {
1865 struct ieee80211_local *local = sdata->local;
1866 int tail_need = 0;
1867
1868 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1869 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1870 tail_need -= skb_tailroom(skb);
1871 tail_need = max_t(int, tail_need, 0);
1872 }
1873
1874 if (skb_cloned(skb) &&
1875 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1876 !skb_clone_writable(skb, ETH_HLEN) ||
1877 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1878 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1879 else if (head_need || tail_need)
1880 I802_DEBUG_INC(local->tx_expand_skb_head);
1881 else
1882 return 0;
1883
1884 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1885 wiphy_debug(local->hw.wiphy,
1886 "failed to reallocate TX buffer\n");
1887 return -ENOMEM;
1888 }
1889
1890 return 0;
1891 }
1892
1893 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1894 struct sta_info *sta, struct sk_buff *skb)
1895 {
1896 struct ieee80211_local *local = sdata->local;
1897 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1898 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1899 int headroom;
1900 bool may_encrypt;
1901
1902 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1903
1904 headroom = local->tx_headroom;
1905 if (may_encrypt)
1906 headroom += sdata->encrypt_headroom;
1907 headroom -= skb_headroom(skb);
1908 headroom = max_t(int, 0, headroom);
1909
1910 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1911 ieee80211_free_txskb(&local->hw, skb);
1912 return;
1913 }
1914
1915 hdr = (struct ieee80211_hdr *) skb->data;
1916 info->control.vif = &sdata->vif;
1917
1918 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1919 if (ieee80211_is_data(hdr->frame_control) &&
1920 is_unicast_ether_addr(hdr->addr1)) {
1921 if (mesh_nexthop_resolve(sdata, skb))
1922 return; /* skb queued: don't free */
1923 } else {
1924 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1925 }
1926 }
1927
1928 ieee80211_set_qos_hdr(sdata, skb);
1929 ieee80211_tx(sdata, sta, skb, false);
1930 }
1931
1932 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1933 struct sk_buff *skb)
1934 {
1935 struct ieee80211_radiotap_iterator iterator;
1936 struct ieee80211_radiotap_header *rthdr =
1937 (struct ieee80211_radiotap_header *) skb->data;
1938 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1939 struct ieee80211_supported_band *sband =
1940 local->hw.wiphy->bands[info->band];
1941 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1942 NULL);
1943 u16 txflags;
1944 u16 rate = 0;
1945 bool rate_found = false;
1946 u8 rate_retries = 0;
1947 u16 rate_flags = 0;
1948 u8 mcs_known, mcs_flags, mcs_bw;
1949 u16 vht_known;
1950 u8 vht_mcs = 0, vht_nss = 0;
1951 int i;
1952
1953 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1954 IEEE80211_TX_CTL_DONTFRAG;
1955
1956 /*
1957 * for every radiotap entry that is present
1958 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1959 * entries present, or -EINVAL on error)
1960 */
1961
1962 while (!ret) {
1963 ret = ieee80211_radiotap_iterator_next(&iterator);
1964
1965 if (ret)
1966 continue;
1967
1968 /* see if this argument is something we can use */
1969 switch (iterator.this_arg_index) {
1970 /*
1971 * You must take care when dereferencing iterator.this_arg
1972 * for multibyte types... the pointer is not aligned. Use
1973 * get_unaligned((type *)iterator.this_arg) to dereference
1974 * iterator.this_arg for type "type" safely on all arches.
1975 */
1976 case IEEE80211_RADIOTAP_FLAGS:
1977 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1978 /*
1979 * this indicates that the skb we have been
1980 * handed has the 32-bit FCS CRC at the end...
1981 * we should react to that by snipping it off
1982 * because it will be recomputed and added
1983 * on transmission
1984 */
1985 if (skb->len < (iterator._max_length + FCS_LEN))
1986 return false;
1987
1988 skb_trim(skb, skb->len - FCS_LEN);
1989 }
1990 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1991 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1992 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1993 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1994 break;
1995
1996 case IEEE80211_RADIOTAP_TX_FLAGS:
1997 txflags = get_unaligned_le16(iterator.this_arg);
1998 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1999 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2000 break;
2001
2002 case IEEE80211_RADIOTAP_RATE:
2003 rate = *iterator.this_arg;
2004 rate_flags = 0;
2005 rate_found = true;
2006 break;
2007
2008 case IEEE80211_RADIOTAP_DATA_RETRIES:
2009 rate_retries = *iterator.this_arg;
2010 break;
2011
2012 case IEEE80211_RADIOTAP_MCS:
2013 mcs_known = iterator.this_arg[0];
2014 mcs_flags = iterator.this_arg[1];
2015 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2016 break;
2017
2018 rate_found = true;
2019 rate = iterator.this_arg[2];
2020 rate_flags = IEEE80211_TX_RC_MCS;
2021
2022 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2023 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2024 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2025
2026 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2027 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2028 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2029 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2030 break;
2031
2032 case IEEE80211_RADIOTAP_VHT:
2033 vht_known = get_unaligned_le16(iterator.this_arg);
2034 rate_found = true;
2035
2036 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2037 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2038 (iterator.this_arg[2] &
2039 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2040 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2041 if (vht_known &
2042 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2043 if (iterator.this_arg[3] == 1)
2044 rate_flags |=
2045 IEEE80211_TX_RC_40_MHZ_WIDTH;
2046 else if (iterator.this_arg[3] == 4)
2047 rate_flags |=
2048 IEEE80211_TX_RC_80_MHZ_WIDTH;
2049 else if (iterator.this_arg[3] == 11)
2050 rate_flags |=
2051 IEEE80211_TX_RC_160_MHZ_WIDTH;
2052 }
2053
2054 vht_mcs = iterator.this_arg[4] >> 4;
2055 vht_nss = iterator.this_arg[4] & 0xF;
2056 break;
2057
2058 /*
2059 * Please update the file
2060 * Documentation/networking/mac80211-injection.txt
2061 * when parsing new fields here.
2062 */
2063
2064 default:
2065 break;
2066 }
2067 }
2068
2069 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2070 return false;
2071
2072 if (rate_found) {
2073 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2074
2075 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2076 info->control.rates[i].idx = -1;
2077 info->control.rates[i].flags = 0;
2078 info->control.rates[i].count = 0;
2079 }
2080
2081 if (rate_flags & IEEE80211_TX_RC_MCS) {
2082 info->control.rates[0].idx = rate;
2083 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2084 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2085 vht_nss);
2086 } else {
2087 for (i = 0; i < sband->n_bitrates; i++) {
2088 if (rate * 5 != sband->bitrates[i].bitrate)
2089 continue;
2090
2091 info->control.rates[0].idx = i;
2092 break;
2093 }
2094 }
2095
2096 if (info->control.rates[0].idx < 0)
2097 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2098
2099 info->control.rates[0].flags = rate_flags;
2100 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2101 local->hw.max_rate_tries);
2102 }
2103
2104 /*
2105 * remove the radiotap header
2106 * iterator->_max_length was sanity-checked against
2107 * skb->len by iterator init
2108 */
2109 skb_pull(skb, iterator._max_length);
2110
2111 return true;
2112 }
2113
2114 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2115 struct net_device *dev)
2116 {
2117 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2118 struct ieee80211_chanctx_conf *chanctx_conf;
2119 struct ieee80211_radiotap_header *prthdr =
2120 (struct ieee80211_radiotap_header *)skb->data;
2121 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2122 struct ieee80211_hdr *hdr;
2123 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2124 struct cfg80211_chan_def *chandef;
2125 u16 len_rthdr;
2126 int hdrlen;
2127
2128 /* check for not even having the fixed radiotap header part */
2129 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2130 goto fail; /* too short to be possibly valid */
2131
2132 /* is it a header version we can trust to find length from? */
2133 if (unlikely(prthdr->it_version))
2134 goto fail; /* only version 0 is supported */
2135
2136 /* then there must be a radiotap header with a length we can use */
2137 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2138
2139 /* does the skb contain enough to deliver on the alleged length? */
2140 if (unlikely(skb->len < len_rthdr))
2141 goto fail; /* skb too short for claimed rt header extent */
2142
2143 /*
2144 * fix up the pointers accounting for the radiotap
2145 * header still being in there. We are being given
2146 * a precooked IEEE80211 header so no need for
2147 * normal processing
2148 */
2149 skb_set_mac_header(skb, len_rthdr);
2150 /*
2151 * these are just fixed to the end of the rt area since we
2152 * don't have any better information and at this point, nobody cares
2153 */
2154 skb_set_network_header(skb, len_rthdr);
2155 skb_set_transport_header(skb, len_rthdr);
2156
2157 if (skb->len < len_rthdr + 2)
2158 goto fail;
2159
2160 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2161 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2162
2163 if (skb->len < len_rthdr + hdrlen)
2164 goto fail;
2165
2166 /*
2167 * Initialize skb->protocol if the injected frame is a data frame
2168 * carrying a rfc1042 header
2169 */
2170 if (ieee80211_is_data(hdr->frame_control) &&
2171 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2172 u8 *payload = (u8 *)hdr + hdrlen;
2173
2174 if (ether_addr_equal(payload, rfc1042_header))
2175 skb->protocol = cpu_to_be16((payload[6] << 8) |
2176 payload[7]);
2177 }
2178
2179 memset(info, 0, sizeof(*info));
2180
2181 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2182 IEEE80211_TX_CTL_INJECTED;
2183
2184 rcu_read_lock();
2185
2186 /*
2187 * We process outgoing injected frames that have a local address
2188 * we handle as though they are non-injected frames.
2189 * This code here isn't entirely correct, the local MAC address
2190 * isn't always enough to find the interface to use; for proper
2191 * VLAN/WDS support we will need a different mechanism (which
2192 * likely isn't going to be monitor interfaces).
2193 */
2194 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2195
2196 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2197 if (!ieee80211_sdata_running(tmp_sdata))
2198 continue;
2199 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2200 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2201 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2202 continue;
2203 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2204 sdata = tmp_sdata;
2205 break;
2206 }
2207 }
2208
2209 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2210 if (!chanctx_conf) {
2211 tmp_sdata = rcu_dereference(local->monitor_sdata);
2212 if (tmp_sdata)
2213 chanctx_conf =
2214 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2215 }
2216
2217 if (chanctx_conf)
2218 chandef = &chanctx_conf->def;
2219 else if (!local->use_chanctx)
2220 chandef = &local->_oper_chandef;
2221 else
2222 goto fail_rcu;
2223
2224 /*
2225 * Frame injection is not allowed if beaconing is not allowed
2226 * or if we need radar detection. Beaconing is usually not allowed when
2227 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2228 * Passive scan is also used in world regulatory domains where
2229 * your country is not known and as such it should be treated as
2230 * NO TX unless the channel is explicitly allowed in which case
2231 * your current regulatory domain would not have the passive scan
2232 * flag.
2233 *
2234 * Since AP mode uses monitor interfaces to inject/TX management
2235 * frames we can make AP mode the exception to this rule once it
2236 * supports radar detection as its implementation can deal with
2237 * radar detection by itself. We can do that later by adding a
2238 * monitor flag interfaces used for AP support.
2239 */
2240 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2241 sdata->vif.type))
2242 goto fail_rcu;
2243
2244 info->band = chandef->chan->band;
2245
2246 /* process and remove the injection radiotap header */
2247 if (!ieee80211_parse_tx_radiotap(local, skb))
2248 goto fail_rcu;
2249
2250 ieee80211_xmit(sdata, NULL, skb);
2251 rcu_read_unlock();
2252
2253 return NETDEV_TX_OK;
2254
2255 fail_rcu:
2256 rcu_read_unlock();
2257 fail:
2258 dev_kfree_skb(skb);
2259 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2260 }
2261
2262 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2263 {
2264 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2265
2266 return ethertype == ETH_P_TDLS &&
2267 skb->len > 14 &&
2268 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2269 }
2270
2271 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2272 struct sk_buff *skb,
2273 struct sta_info **sta_out)
2274 {
2275 struct sta_info *sta;
2276
2277 switch (sdata->vif.type) {
2278 case NL80211_IFTYPE_AP_VLAN:
2279 sta = rcu_dereference(sdata->u.vlan.sta);
2280 if (sta) {
2281 *sta_out = sta;
2282 return 0;
2283 } else if (sdata->wdev.use_4addr) {
2284 return -ENOLINK;
2285 }
2286 /* fall through */
2287 case NL80211_IFTYPE_AP:
2288 case NL80211_IFTYPE_OCB:
2289 case NL80211_IFTYPE_ADHOC:
2290 if (is_multicast_ether_addr(skb->data)) {
2291 *sta_out = ERR_PTR(-ENOENT);
2292 return 0;
2293 }
2294 sta = sta_info_get_bss(sdata, skb->data);
2295 break;
2296 case NL80211_IFTYPE_WDS:
2297 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2298 break;
2299 #ifdef CONFIG_MAC80211_MESH
2300 case NL80211_IFTYPE_MESH_POINT:
2301 /* determined much later */
2302 *sta_out = NULL;
2303 return 0;
2304 #endif
2305 case NL80211_IFTYPE_STATION:
2306 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2307 sta = sta_info_get(sdata, skb->data);
2308 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2309 if (test_sta_flag(sta,
2310 WLAN_STA_TDLS_PEER_AUTH)) {
2311 *sta_out = sta;
2312 return 0;
2313 }
2314
2315 /*
2316 * TDLS link during setup - throw out frames to
2317 * peer. Allow TDLS-setup frames to unauthorized
2318 * peers for the special case of a link teardown
2319 * after a TDLS sta is removed due to being
2320 * unreachable.
2321 */
2322 if (!ieee80211_is_tdls_setup(skb))
2323 return -EINVAL;
2324 }
2325
2326 }
2327
2328 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2329 if (!sta)
2330 return -ENOLINK;
2331 break;
2332 default:
2333 return -EINVAL;
2334 }
2335
2336 *sta_out = sta ?: ERR_PTR(-ENOENT);
2337 return 0;
2338 }
2339
2340 /**
2341 * ieee80211_build_hdr - build 802.11 header in the given frame
2342 * @sdata: virtual interface to build the header for
2343 * @skb: the skb to build the header in
2344 * @info_flags: skb flags to set
2345 *
2346 * This function takes the skb with 802.3 header and reformats the header to
2347 * the appropriate IEEE 802.11 header based on which interface the packet is
2348 * being transmitted on.
2349 *
2350 * Note that this function also takes care of the TX status request and
2351 * potential unsharing of the SKB - this needs to be interleaved with the
2352 * header building.
2353 *
2354 * The function requires the read-side RCU lock held
2355 *
2356 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2357 */
2358 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2359 struct sk_buff *skb, u32 info_flags,
2360 struct sta_info *sta)
2361 {
2362 struct ieee80211_local *local = sdata->local;
2363 struct ieee80211_tx_info *info;
2364 int head_need;
2365 u16 ethertype, hdrlen, meshhdrlen = 0;
2366 __le16 fc;
2367 struct ieee80211_hdr hdr;
2368 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2369 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2370 const u8 *encaps_data;
2371 int encaps_len, skip_header_bytes;
2372 bool wme_sta = false, authorized = false;
2373 bool tdls_peer;
2374 bool multicast;
2375 u16 info_id = 0;
2376 struct ieee80211_chanctx_conf *chanctx_conf;
2377 struct ieee80211_sub_if_data *ap_sdata;
2378 enum nl80211_band band;
2379 int ret;
2380
2381 if (IS_ERR(sta))
2382 sta = NULL;
2383
2384 /* convert Ethernet header to proper 802.11 header (based on
2385 * operation mode) */
2386 ethertype = (skb->data[12] << 8) | skb->data[13];
2387 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2388
2389 switch (sdata->vif.type) {
2390 case NL80211_IFTYPE_AP_VLAN:
2391 if (sdata->wdev.use_4addr) {
2392 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2393 /* RA TA DA SA */
2394 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2395 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2396 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2397 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2398 hdrlen = 30;
2399 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2400 wme_sta = sta->sta.wme;
2401 }
2402 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2403 u.ap);
2404 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2405 if (!chanctx_conf) {
2406 ret = -ENOTCONN;
2407 goto free;
2408 }
2409 band = chanctx_conf->def.chan->band;
2410 if (sdata->wdev.use_4addr)
2411 break;
2412 /* fall through */
2413 case NL80211_IFTYPE_AP:
2414 if (sdata->vif.type == NL80211_IFTYPE_AP)
2415 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2416 if (!chanctx_conf) {
2417 ret = -ENOTCONN;
2418 goto free;
2419 }
2420 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2421 /* DA BSSID SA */
2422 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2423 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2424 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2425 hdrlen = 24;
2426 band = chanctx_conf->def.chan->band;
2427 break;
2428 case NL80211_IFTYPE_WDS:
2429 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2430 /* RA TA DA SA */
2431 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2432 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2433 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2434 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2435 hdrlen = 30;
2436 /*
2437 * This is the exception! WDS style interfaces are prohibited
2438 * when channel contexts are in used so this must be valid
2439 */
2440 band = local->hw.conf.chandef.chan->band;
2441 break;
2442 #ifdef CONFIG_MAC80211_MESH
2443 case NL80211_IFTYPE_MESH_POINT:
2444 if (!is_multicast_ether_addr(skb->data)) {
2445 struct sta_info *next_hop;
2446 bool mpp_lookup = true;
2447
2448 mpath = mesh_path_lookup(sdata, skb->data);
2449 if (mpath) {
2450 mpp_lookup = false;
2451 next_hop = rcu_dereference(mpath->next_hop);
2452 if (!next_hop ||
2453 !(mpath->flags & (MESH_PATH_ACTIVE |
2454 MESH_PATH_RESOLVING)))
2455 mpp_lookup = true;
2456 }
2457
2458 if (mpp_lookup) {
2459 mppath = mpp_path_lookup(sdata, skb->data);
2460 if (mppath)
2461 mppath->exp_time = jiffies;
2462 }
2463
2464 if (mppath && mpath)
2465 mesh_path_del(sdata, mpath->dst);
2466 }
2467
2468 /*
2469 * Use address extension if it is a packet from
2470 * another interface or if we know the destination
2471 * is being proxied by a portal (i.e. portal address
2472 * differs from proxied address)
2473 */
2474 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2475 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2476 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2477 skb->data, skb->data + ETH_ALEN);
2478 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2479 NULL, NULL);
2480 } else {
2481 /* DS -> MBSS (802.11-2012 13.11.3.3).
2482 * For unicast with unknown forwarding information,
2483 * destination might be in the MBSS or if that fails
2484 * forwarded to another mesh gate. In either case
2485 * resolution will be handled in ieee80211_xmit(), so
2486 * leave the original DA. This also works for mcast */
2487 const u8 *mesh_da = skb->data;
2488
2489 if (mppath)
2490 mesh_da = mppath->mpp;
2491 else if (mpath)
2492 mesh_da = mpath->dst;
2493
2494 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2495 mesh_da, sdata->vif.addr);
2496 if (is_multicast_ether_addr(mesh_da))
2497 /* DA TA mSA AE:SA */
2498 meshhdrlen = ieee80211_new_mesh_header(
2499 sdata, &mesh_hdr,
2500 skb->data + ETH_ALEN, NULL);
2501 else
2502 /* RA TA mDA mSA AE:DA SA */
2503 meshhdrlen = ieee80211_new_mesh_header(
2504 sdata, &mesh_hdr, skb->data,
2505 skb->data + ETH_ALEN);
2506
2507 }
2508 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2509 if (!chanctx_conf) {
2510 ret = -ENOTCONN;
2511 goto free;
2512 }
2513 band = chanctx_conf->def.chan->band;
2514 break;
2515 #endif
2516 case NL80211_IFTYPE_STATION:
2517 /* we already did checks when looking up the RA STA */
2518 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2519
2520 if (tdls_peer) {
2521 /* DA SA BSSID */
2522 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2523 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2524 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2525 hdrlen = 24;
2526 } else if (sdata->u.mgd.use_4addr &&
2527 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2528 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2529 IEEE80211_FCTL_TODS);
2530 /* RA TA DA SA */
2531 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2532 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2533 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2534 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2535 hdrlen = 30;
2536 } else {
2537 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2538 /* BSSID SA DA */
2539 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2540 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2541 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2542 hdrlen = 24;
2543 }
2544 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2545 if (!chanctx_conf) {
2546 ret = -ENOTCONN;
2547 goto free;
2548 }
2549 band = chanctx_conf->def.chan->band;
2550 break;
2551 case NL80211_IFTYPE_OCB:
2552 /* DA SA BSSID */
2553 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2554 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2555 eth_broadcast_addr(hdr.addr3);
2556 hdrlen = 24;
2557 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2558 if (!chanctx_conf) {
2559 ret = -ENOTCONN;
2560 goto free;
2561 }
2562 band = chanctx_conf->def.chan->band;
2563 break;
2564 case NL80211_IFTYPE_ADHOC:
2565 /* DA SA BSSID */
2566 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2567 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2568 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2569 hdrlen = 24;
2570 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2571 if (!chanctx_conf) {
2572 ret = -ENOTCONN;
2573 goto free;
2574 }
2575 band = chanctx_conf->def.chan->band;
2576 break;
2577 default:
2578 ret = -EINVAL;
2579 goto free;
2580 }
2581
2582 multicast = is_multicast_ether_addr(hdr.addr1);
2583
2584 /* sta is always NULL for mesh */
2585 if (sta) {
2586 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2587 wme_sta = sta->sta.wme;
2588 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2589 /* For mesh, the use of the QoS header is mandatory */
2590 wme_sta = true;
2591 }
2592
2593 /* receiver does QoS (which also means we do) use it */
2594 if (wme_sta) {
2595 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2596 hdrlen += 2;
2597 }
2598
2599 /*
2600 * Drop unicast frames to unauthorised stations unless they are
2601 * EAPOL frames from the local station.
2602 */
2603 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2604 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2605 !multicast && !authorized &&
2606 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2607 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2608 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2609 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2610 sdata->name, hdr.addr1);
2611 #endif
2612
2613 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2614
2615 ret = -EPERM;
2616 goto free;
2617 }
2618
2619 if (unlikely(!multicast && skb->sk &&
2620 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2621 struct sk_buff *ack_skb = skb_clone_sk(skb);
2622
2623 if (ack_skb) {
2624 unsigned long flags;
2625 int id;
2626
2627 spin_lock_irqsave(&local->ack_status_lock, flags);
2628 id = idr_alloc(&local->ack_status_frames, ack_skb,
2629 1, 0x10000, GFP_ATOMIC);
2630 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2631
2632 if (id >= 0) {
2633 info_id = id;
2634 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2635 } else {
2636 kfree_skb(ack_skb);
2637 }
2638 }
2639 }
2640
2641 /*
2642 * If the skb is shared we need to obtain our own copy.
2643 */
2644 if (skb_shared(skb)) {
2645 struct sk_buff *tmp_skb = skb;
2646
2647 /* can't happen -- skb is a clone if info_id != 0 */
2648 WARN_ON(info_id);
2649
2650 skb = skb_clone(skb, GFP_ATOMIC);
2651 kfree_skb(tmp_skb);
2652
2653 if (!skb) {
2654 ret = -ENOMEM;
2655 goto free;
2656 }
2657 }
2658
2659 hdr.frame_control = fc;
2660 hdr.duration_id = 0;
2661 hdr.seq_ctrl = 0;
2662
2663 skip_header_bytes = ETH_HLEN;
2664 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2665 encaps_data = bridge_tunnel_header;
2666 encaps_len = sizeof(bridge_tunnel_header);
2667 skip_header_bytes -= 2;
2668 } else if (ethertype >= ETH_P_802_3_MIN) {
2669 encaps_data = rfc1042_header;
2670 encaps_len = sizeof(rfc1042_header);
2671 skip_header_bytes -= 2;
2672 } else {
2673 encaps_data = NULL;
2674 encaps_len = 0;
2675 }
2676
2677 skb_pull(skb, skip_header_bytes);
2678 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2679
2680 /*
2681 * So we need to modify the skb header and hence need a copy of
2682 * that. The head_need variable above doesn't, so far, include
2683 * the needed header space that we don't need right away. If we
2684 * can, then we don't reallocate right now but only after the
2685 * frame arrives at the master device (if it does...)
2686 *
2687 * If we cannot, however, then we will reallocate to include all
2688 * the ever needed space. Also, if we need to reallocate it anyway,
2689 * make it big enough for everything we may ever need.
2690 */
2691
2692 if (head_need > 0 || skb_cloned(skb)) {
2693 head_need += sdata->encrypt_headroom;
2694 head_need += local->tx_headroom;
2695 head_need = max_t(int, 0, head_need);
2696 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2697 ieee80211_free_txskb(&local->hw, skb);
2698 skb = NULL;
2699 return ERR_PTR(-ENOMEM);
2700 }
2701 }
2702
2703 if (encaps_data)
2704 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2705
2706 #ifdef CONFIG_MAC80211_MESH
2707 if (meshhdrlen > 0)
2708 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2709 #endif
2710
2711 if (ieee80211_is_data_qos(fc)) {
2712 __le16 *qos_control;
2713
2714 qos_control = (__le16 *) skb_push(skb, 2);
2715 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2716 /*
2717 * Maybe we could actually set some fields here, for now just
2718 * initialise to zero to indicate no special operation.
2719 */
2720 *qos_control = 0;
2721 } else
2722 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2723
2724 skb_reset_mac_header(skb);
2725
2726 info = IEEE80211_SKB_CB(skb);
2727 memset(info, 0, sizeof(*info));
2728
2729 info->flags = info_flags;
2730 info->ack_frame_id = info_id;
2731 info->band = band;
2732
2733 return skb;
2734 free:
2735 kfree_skb(skb);
2736 return ERR_PTR(ret);
2737 }
2738
2739 /*
2740 * fast-xmit overview
2741 *
2742 * The core idea of this fast-xmit is to remove per-packet checks by checking
2743 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2744 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2745 * much less work can be done per packet. For example, fragmentation must be
2746 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2747 * in the code here.
2748 *
2749 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2750 * header and other data to aid packet processing in ieee80211_xmit_fast().
2751 *
2752 * The most difficult part of this is that when any of these assumptions
2753 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2754 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2755 * since the per-packet code no longer checks the conditions. This is reflected
2756 * by the calls to these functions throughout the rest of the code, and must be
2757 * maintained if any of the TX path checks change.
2758 */
2759
2760 void ieee80211_check_fast_xmit(struct sta_info *sta)
2761 {
2762 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2763 struct ieee80211_local *local = sta->local;
2764 struct ieee80211_sub_if_data *sdata = sta->sdata;
2765 struct ieee80211_hdr *hdr = (void *)build.hdr;
2766 struct ieee80211_chanctx_conf *chanctx_conf;
2767 __le16 fc;
2768
2769 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2770 return;
2771
2772 /* Locking here protects both the pointer itself, and against concurrent
2773 * invocations winning data access races to, e.g., the key pointer that
2774 * is used.
2775 * Without it, the invocation of this function right after the key
2776 * pointer changes wouldn't be sufficient, as another CPU could access
2777 * the pointer, then stall, and then do the cache update after the CPU
2778 * that invalidated the key.
2779 * With the locking, such scenarios cannot happen as the check for the
2780 * key and the fast-tx assignment are done atomically, so the CPU that
2781 * modifies the key will either wait or other one will see the key
2782 * cleared/changed already.
2783 */
2784 spin_lock_bh(&sta->lock);
2785 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2786 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2787 sdata->vif.type == NL80211_IFTYPE_STATION)
2788 goto out;
2789
2790 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2791 goto out;
2792
2793 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2794 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2795 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2796 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2797 goto out;
2798
2799 if (sdata->noack_map)
2800 goto out;
2801
2802 /* fast-xmit doesn't handle fragmentation at all */
2803 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2804 !local->ops->set_frag_threshold)
2805 goto out;
2806
2807 rcu_read_lock();
2808 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2809 if (!chanctx_conf) {
2810 rcu_read_unlock();
2811 goto out;
2812 }
2813 build.band = chanctx_conf->def.chan->band;
2814 rcu_read_unlock();
2815
2816 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2817
2818 switch (sdata->vif.type) {
2819 case NL80211_IFTYPE_ADHOC:
2820 /* DA SA BSSID */
2821 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2822 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2823 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2824 build.hdr_len = 24;
2825 break;
2826 case NL80211_IFTYPE_STATION:
2827 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2828 /* DA SA BSSID */
2829 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2830 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2831 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2832 build.hdr_len = 24;
2833 break;
2834 }
2835
2836 if (sdata->u.mgd.use_4addr) {
2837 /* non-regular ethertype cannot use the fastpath */
2838 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2839 IEEE80211_FCTL_TODS);
2840 /* RA TA DA SA */
2841 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2842 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2843 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2844 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2845 build.hdr_len = 30;
2846 break;
2847 }
2848 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2849 /* BSSID SA DA */
2850 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2851 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2852 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2853 build.hdr_len = 24;
2854 break;
2855 case NL80211_IFTYPE_AP_VLAN:
2856 if (sdata->wdev.use_4addr) {
2857 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2858 IEEE80211_FCTL_TODS);
2859 /* RA TA DA SA */
2860 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2861 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2862 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2863 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2864 build.hdr_len = 30;
2865 break;
2866 }
2867 /* fall through */
2868 case NL80211_IFTYPE_AP:
2869 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2870 /* DA BSSID SA */
2871 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2872 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2873 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2874 build.hdr_len = 24;
2875 break;
2876 default:
2877 /* not handled on fast-xmit */
2878 goto out;
2879 }
2880
2881 if (sta->sta.wme) {
2882 build.hdr_len += 2;
2883 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2884 }
2885
2886 /* We store the key here so there's no point in using rcu_dereference()
2887 * but that's fine because the code that changes the pointers will call
2888 * this function after doing so. For a single CPU that would be enough,
2889 * for multiple see the comment above.
2890 */
2891 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2892 if (!build.key)
2893 build.key = rcu_access_pointer(sdata->default_unicast_key);
2894 if (build.key) {
2895 bool gen_iv, iv_spc, mmic;
2896
2897 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2898 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2899 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2900
2901 /* don't handle software crypto */
2902 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2903 goto out;
2904
2905 switch (build.key->conf.cipher) {
2906 case WLAN_CIPHER_SUITE_CCMP:
2907 case WLAN_CIPHER_SUITE_CCMP_256:
2908 /* add fixed key ID */
2909 if (gen_iv) {
2910 (build.hdr + build.hdr_len)[3] =
2911 0x20 | (build.key->conf.keyidx << 6);
2912 build.pn_offs = build.hdr_len;
2913 }
2914 if (gen_iv || iv_spc)
2915 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2916 break;
2917 case WLAN_CIPHER_SUITE_GCMP:
2918 case WLAN_CIPHER_SUITE_GCMP_256:
2919 /* add fixed key ID */
2920 if (gen_iv) {
2921 (build.hdr + build.hdr_len)[3] =
2922 0x20 | (build.key->conf.keyidx << 6);
2923 build.pn_offs = build.hdr_len;
2924 }
2925 if (gen_iv || iv_spc)
2926 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2927 break;
2928 case WLAN_CIPHER_SUITE_TKIP:
2929 /* cannot handle MMIC or IV generation in xmit-fast */
2930 if (mmic || gen_iv)
2931 goto out;
2932 if (iv_spc)
2933 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2934 break;
2935 case WLAN_CIPHER_SUITE_WEP40:
2936 case WLAN_CIPHER_SUITE_WEP104:
2937 /* cannot handle IV generation in fast-xmit */
2938 if (gen_iv)
2939 goto out;
2940 if (iv_spc)
2941 build.hdr_len += IEEE80211_WEP_IV_LEN;
2942 break;
2943 case WLAN_CIPHER_SUITE_AES_CMAC:
2944 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2945 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2946 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2947 WARN(1,
2948 "management cipher suite 0x%x enabled for data\n",
2949 build.key->conf.cipher);
2950 goto out;
2951 default:
2952 /* we don't know how to generate IVs for this at all */
2953 if (WARN_ON(gen_iv))
2954 goto out;
2955 /* pure hardware keys are OK, of course */
2956 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2957 break;
2958 /* cipher scheme might require space allocation */
2959 if (iv_spc &&
2960 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2961 goto out;
2962 if (iv_spc)
2963 build.hdr_len += build.key->conf.iv_len;
2964 }
2965
2966 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2967 }
2968
2969 hdr->frame_control = fc;
2970
2971 memcpy(build.hdr + build.hdr_len,
2972 rfc1042_header, sizeof(rfc1042_header));
2973 build.hdr_len += sizeof(rfc1042_header);
2974
2975 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2976 /* if the kmemdup fails, continue w/o fast_tx */
2977 if (!fast_tx)
2978 goto out;
2979
2980 out:
2981 /* we might have raced against another call to this function */
2982 old = rcu_dereference_protected(sta->fast_tx,
2983 lockdep_is_held(&sta->lock));
2984 rcu_assign_pointer(sta->fast_tx, fast_tx);
2985 if (old)
2986 kfree_rcu(old, rcu_head);
2987 spin_unlock_bh(&sta->lock);
2988 }
2989
2990 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2991 {
2992 struct sta_info *sta;
2993
2994 rcu_read_lock();
2995 list_for_each_entry_rcu(sta, &local->sta_list, list)
2996 ieee80211_check_fast_xmit(sta);
2997 rcu_read_unlock();
2998 }
2999
3000 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3001 {
3002 struct ieee80211_local *local = sdata->local;
3003 struct sta_info *sta;
3004
3005 rcu_read_lock();
3006
3007 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3008 if (sdata != sta->sdata &&
3009 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3010 continue;
3011 ieee80211_check_fast_xmit(sta);
3012 }
3013
3014 rcu_read_unlock();
3015 }
3016
3017 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3018 {
3019 struct ieee80211_fast_tx *fast_tx;
3020
3021 spin_lock_bh(&sta->lock);
3022 fast_tx = rcu_dereference_protected(sta->fast_tx,
3023 lockdep_is_held(&sta->lock));
3024 RCU_INIT_POINTER(sta->fast_tx, NULL);
3025 spin_unlock_bh(&sta->lock);
3026
3027 if (fast_tx)
3028 kfree_rcu(fast_tx, rcu_head);
3029 }
3030
3031 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3032 struct sk_buff *skb, int headroom,
3033 int *subframe_len)
3034 {
3035 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3036 int padding = (4 - amsdu_len) & 3;
3037
3038 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3039 I802_DEBUG_INC(local->tx_expand_skb_head);
3040
3041 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3042 wiphy_debug(local->hw.wiphy,
3043 "failed to reallocate TX buffer\n");
3044 return false;
3045 }
3046 }
3047
3048 if (padding) {
3049 *subframe_len += padding;
3050 memset(skb_put(skb, padding), 0, padding);
3051 }
3052
3053 return true;
3054 }
3055
3056 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3057 struct ieee80211_fast_tx *fast_tx,
3058 struct sk_buff *skb)
3059 {
3060 struct ieee80211_local *local = sdata->local;
3061 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3062 struct ieee80211_hdr *hdr;
3063 struct ethhdr amsdu_hdr;
3064 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3065 int subframe_len = skb->len - hdr_len;
3066 void *data;
3067 u8 *qc;
3068
3069 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3070 return false;
3071
3072 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3073 return true;
3074
3075 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(amsdu_hdr),
3076 &subframe_len))
3077 return false;
3078
3079 amsdu_hdr.h_proto = cpu_to_be16(subframe_len);
3080 memcpy(amsdu_hdr.h_source, skb->data + fast_tx->sa_offs, ETH_ALEN);
3081 memcpy(amsdu_hdr.h_dest, skb->data + fast_tx->da_offs, ETH_ALEN);
3082
3083 data = skb_push(skb, sizeof(amsdu_hdr));
3084 memmove(data, data + sizeof(amsdu_hdr), hdr_len);
3085 memcpy(data + hdr_len, &amsdu_hdr, sizeof(amsdu_hdr));
3086
3087 hdr = data;
3088 qc = ieee80211_get_qos_ctl(hdr);
3089 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3090
3091 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3092
3093 return true;
3094 }
3095
3096 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3097 struct sta_info *sta,
3098 struct ieee80211_fast_tx *fast_tx,
3099 struct sk_buff *skb)
3100 {
3101 struct ieee80211_local *local = sdata->local;
3102 struct fq *fq = &local->fq;
3103 struct fq_tin *tin;
3104 struct fq_flow *flow;
3105 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3106 struct ieee80211_txq *txq = sta->sta.txq[tid];
3107 struct txq_info *txqi;
3108 struct sk_buff **frag_tail, *head;
3109 int subframe_len = skb->len - ETH_ALEN;
3110 u8 max_subframes = sta->sta.max_amsdu_subframes;
3111 int max_frags = local->hw.max_tx_fragments;
3112 int max_amsdu_len = sta->sta.max_amsdu_len;
3113 __be16 len;
3114 void *data;
3115 bool ret = false;
3116 unsigned int orig_len;
3117 int n = 1, nfrags;
3118
3119 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3120 return false;
3121
3122 if (!txq)
3123 return false;
3124
3125 txqi = to_txq_info(txq);
3126 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3127 return false;
3128
3129 if (sta->sta.max_rc_amsdu_len)
3130 max_amsdu_len = min_t(int, max_amsdu_len,
3131 sta->sta.max_rc_amsdu_len);
3132
3133 spin_lock_bh(&fq->lock);
3134
3135 /* TODO: Ideally aggregation should be done on dequeue to remain
3136 * responsive to environment changes.
3137 */
3138
3139 tin = &txqi->tin;
3140 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3141 head = skb_peek_tail(&flow->queue);
3142 if (!head)
3143 goto out;
3144
3145 orig_len = head->len;
3146
3147 if (skb->len + head->len > max_amsdu_len)
3148 goto out;
3149
3150 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3151 goto out;
3152
3153 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3154 nfrags += 1 + skb_shinfo(head)->nr_frags;
3155 frag_tail = &skb_shinfo(head)->frag_list;
3156 while (*frag_tail) {
3157 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3158 frag_tail = &(*frag_tail)->next;
3159 n++;
3160 }
3161
3162 if (max_subframes && n > max_subframes)
3163 goto out;
3164
3165 if (max_frags && nfrags > max_frags)
3166 goto out;
3167
3168 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3169 &subframe_len))
3170 goto out;
3171
3172 ret = true;
3173 data = skb_push(skb, ETH_ALEN + 2);
3174 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3175
3176 data += 2 * ETH_ALEN;
3177 len = cpu_to_be16(subframe_len);
3178 memcpy(data, &len, 2);
3179 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3180
3181 head->len += skb->len;
3182 head->data_len += skb->len;
3183 *frag_tail = skb;
3184
3185 flow->backlog += head->len - orig_len;
3186 tin->backlog_bytes += head->len - orig_len;
3187
3188 fq_recalc_backlog(fq, tin, flow);
3189
3190 out:
3191 spin_unlock_bh(&fq->lock);
3192
3193 return ret;
3194 }
3195
3196 /*
3197 * Can be called while the sta lock is held. Anything that can cause packets to
3198 * be generated will cause deadlock!
3199 */
3200 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3201 struct sta_info *sta, u8 pn_offs,
3202 struct ieee80211_key *key,
3203 struct sk_buff *skb)
3204 {
3205 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3206 struct ieee80211_hdr *hdr = (void *)skb->data;
3207 u8 tid = IEEE80211_NUM_TIDS;
3208
3209 if (key)
3210 info->control.hw_key = &key->conf;
3211
3212 ieee80211_tx_stats(skb->dev, skb->len);
3213
3214 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3215 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3216 *ieee80211_get_qos_ctl(hdr) = tid;
3217 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3218 } else {
3219 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3220 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3221 sdata->sequence_number += 0x10;
3222 }
3223
3224 if (skb_shinfo(skb)->gso_size)
3225 sta->tx_stats.msdu[tid] +=
3226 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3227 else
3228 sta->tx_stats.msdu[tid]++;
3229
3230 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3231
3232 /* statistics normally done by ieee80211_tx_h_stats (but that
3233 * has to consider fragmentation, so is more complex)
3234 */
3235 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3236 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3237
3238 if (pn_offs) {
3239 u64 pn;
3240 u8 *crypto_hdr = skb->data + pn_offs;
3241
3242 switch (key->conf.cipher) {
3243 case WLAN_CIPHER_SUITE_CCMP:
3244 case WLAN_CIPHER_SUITE_CCMP_256:
3245 case WLAN_CIPHER_SUITE_GCMP:
3246 case WLAN_CIPHER_SUITE_GCMP_256:
3247 pn = atomic64_inc_return(&key->conf.tx_pn);
3248 crypto_hdr[0] = pn;
3249 crypto_hdr[1] = pn >> 8;
3250 crypto_hdr[4] = pn >> 16;
3251 crypto_hdr[5] = pn >> 24;
3252 crypto_hdr[6] = pn >> 32;
3253 crypto_hdr[7] = pn >> 40;
3254 break;
3255 }
3256 }
3257 }
3258
3259 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3260 struct sta_info *sta,
3261 struct ieee80211_fast_tx *fast_tx,
3262 struct sk_buff *skb)
3263 {
3264 struct ieee80211_local *local = sdata->local;
3265 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3266 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3267 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3268 struct ethhdr eth;
3269 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3270 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3271 struct ieee80211_tx_data tx;
3272 ieee80211_tx_result r;
3273 struct tid_ampdu_tx *tid_tx = NULL;
3274 u8 tid = IEEE80211_NUM_TIDS;
3275
3276 /* control port protocol needs a lot of special handling */
3277 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3278 return false;
3279
3280 /* only RFC 1042 SNAP */
3281 if (ethertype < ETH_P_802_3_MIN)
3282 return false;
3283
3284 /* don't handle TX status request here either */
3285 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3286 return false;
3287
3288 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3289 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3290 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3291 if (tid_tx) {
3292 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3293 return false;
3294 if (tid_tx->timeout)
3295 tid_tx->last_tx = jiffies;
3296 }
3297 }
3298
3299 /* after this point (skb is modified) we cannot return false */
3300
3301 if (skb_shared(skb)) {
3302 struct sk_buff *tmp_skb = skb;
3303
3304 skb = skb_clone(skb, GFP_ATOMIC);
3305 kfree_skb(tmp_skb);
3306
3307 if (!skb)
3308 return true;
3309 }
3310
3311 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3312 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3313 return true;
3314
3315 /* will not be crypto-handled beyond what we do here, so use false
3316 * as the may-encrypt argument for the resize to not account for
3317 * more room than we already have in 'extra_head'
3318 */
3319 if (unlikely(ieee80211_skb_resize(sdata, skb,
3320 max_t(int, extra_head + hw_headroom -
3321 skb_headroom(skb), 0),
3322 false))) {
3323 kfree_skb(skb);
3324 return true;
3325 }
3326
3327 memcpy(&eth, skb->data, ETH_HLEN - 2);
3328 hdr = (void *)skb_push(skb, extra_head);
3329 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3330 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3331 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3332
3333 memset(info, 0, sizeof(*info));
3334 info->band = fast_tx->band;
3335 info->control.vif = &sdata->vif;
3336 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3337 IEEE80211_TX_CTL_DONTFRAG |
3338 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3339 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3340
3341 __skb_queue_head_init(&tx.skbs);
3342
3343 tx.flags = IEEE80211_TX_UNICAST;
3344 tx.local = local;
3345 tx.sdata = sdata;
3346 tx.sta = sta;
3347 tx.key = fast_tx->key;
3348
3349 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3350 tx.skb = skb;
3351 r = ieee80211_tx_h_rate_ctrl(&tx);
3352 skb = tx.skb;
3353 tx.skb = NULL;
3354
3355 if (r != TX_CONTINUE) {
3356 if (r != TX_QUEUED)
3357 kfree_skb(skb);
3358 return true;
3359 }
3360 }
3361
3362 if (ieee80211_queue_skb(local, sdata, sta, skb))
3363 return true;
3364
3365 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3366 fast_tx->key, skb);
3367
3368 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3369 sdata = container_of(sdata->bss,
3370 struct ieee80211_sub_if_data, u.ap);
3371
3372 __skb_queue_tail(&tx.skbs, skb);
3373 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3374 return true;
3375 }
3376
3377 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3378 struct ieee80211_txq *txq)
3379 {
3380 struct ieee80211_local *local = hw_to_local(hw);
3381 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3382 struct ieee80211_hdr *hdr;
3383 struct sk_buff *skb = NULL;
3384 struct fq *fq = &local->fq;
3385 struct fq_tin *tin = &txqi->tin;
3386 struct ieee80211_tx_info *info;
3387 struct ieee80211_tx_data tx;
3388 ieee80211_tx_result r;
3389
3390 spin_lock_bh(&fq->lock);
3391
3392 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3393 goto out;
3394
3395 /* Make sure fragments stay together. */
3396 skb = __skb_dequeue(&txqi->frags);
3397 if (skb)
3398 goto out;
3399
3400 begin:
3401 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3402 if (!skb)
3403 goto out;
3404
3405 ieee80211_set_skb_vif(skb, txqi);
3406
3407 hdr = (struct ieee80211_hdr *)skb->data;
3408 info = IEEE80211_SKB_CB(skb);
3409
3410 memset(&tx, 0, sizeof(tx));
3411 __skb_queue_head_init(&tx.skbs);
3412 tx.local = local;
3413 tx.skb = skb;
3414 tx.sdata = vif_to_sdata(info->control.vif);
3415
3416 if (txq->sta)
3417 tx.sta = container_of(txq->sta, struct sta_info, sta);
3418
3419 /*
3420 * The key can be removed while the packet was queued, so need to call
3421 * this here to get the current key.
3422 */
3423 r = ieee80211_tx_h_select_key(&tx);
3424 if (r != TX_CONTINUE) {
3425 ieee80211_free_txskb(&local->hw, skb);
3426 goto begin;
3427 }
3428
3429 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3430 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3431 sta);
3432 u8 pn_offs = 0;
3433
3434 if (tx.key &&
3435 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3436 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3437
3438 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3439 tx.key, skb);
3440 } else {
3441 if (invoke_tx_handlers_late(&tx))
3442 goto begin;
3443
3444 skb = __skb_dequeue(&tx.skbs);
3445
3446 if (!skb_queue_empty(&tx.skbs))
3447 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3448 }
3449
3450 if (skb && skb_has_frag_list(skb) &&
3451 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3452 if (skb_linearize(skb)) {
3453 ieee80211_free_txskb(&local->hw, skb);
3454 goto begin;
3455 }
3456 }
3457
3458 out:
3459 spin_unlock_bh(&fq->lock);
3460
3461 return skb;
3462 }
3463 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3464
3465 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3466 struct net_device *dev,
3467 u32 info_flags)
3468 {
3469 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3470 struct sta_info *sta;
3471 struct sk_buff *next;
3472
3473 if (unlikely(skb->len < ETH_HLEN)) {
3474 kfree_skb(skb);
3475 return;
3476 }
3477
3478 rcu_read_lock();
3479
3480 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3481 goto out_free;
3482
3483 if (!IS_ERR_OR_NULL(sta)) {
3484 struct ieee80211_fast_tx *fast_tx;
3485
3486 fast_tx = rcu_dereference(sta->fast_tx);
3487
3488 if (fast_tx &&
3489 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3490 goto out;
3491 }
3492
3493 if (skb_is_gso(skb)) {
3494 struct sk_buff *segs;
3495
3496 segs = skb_gso_segment(skb, 0);
3497 if (IS_ERR(segs)) {
3498 goto out_free;
3499 } else if (segs) {
3500 consume_skb(skb);
3501 skb = segs;
3502 }
3503 } else {
3504 /* we cannot process non-linear frames on this path */
3505 if (skb_linearize(skb)) {
3506 kfree_skb(skb);
3507 goto out;
3508 }
3509
3510 /* the frame could be fragmented, software-encrypted, and other
3511 * things so we cannot really handle checksum offload with it -
3512 * fix it up in software before we handle anything else.
3513 */
3514 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3515 skb_set_transport_header(skb,
3516 skb_checksum_start_offset(skb));
3517 if (skb_checksum_help(skb))
3518 goto out_free;
3519 }
3520 }
3521
3522 next = skb;
3523 while (next) {
3524 skb = next;
3525 next = skb->next;
3526
3527 skb->prev = NULL;
3528 skb->next = NULL;
3529
3530 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3531 if (IS_ERR(skb))
3532 goto out;
3533
3534 ieee80211_tx_stats(dev, skb->len);
3535
3536 ieee80211_xmit(sdata, sta, skb);
3537 }
3538 goto out;
3539 out_free:
3540 kfree_skb(skb);
3541 out:
3542 rcu_read_unlock();
3543 }
3544
3545 /**
3546 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3547 * @skb: packet to be sent
3548 * @dev: incoming interface
3549 *
3550 * On failure skb will be freed.
3551 */
3552 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3553 struct net_device *dev)
3554 {
3555 __ieee80211_subif_start_xmit(skb, dev, 0);
3556 return NETDEV_TX_OK;
3557 }
3558
3559 struct sk_buff *
3560 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3561 struct sk_buff *skb, u32 info_flags)
3562 {
3563 struct ieee80211_hdr *hdr;
3564 struct ieee80211_tx_data tx = {
3565 .local = sdata->local,
3566 .sdata = sdata,
3567 };
3568 struct sta_info *sta;
3569
3570 rcu_read_lock();
3571
3572 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3573 kfree_skb(skb);
3574 skb = ERR_PTR(-EINVAL);
3575 goto out;
3576 }
3577
3578 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3579 if (IS_ERR(skb))
3580 goto out;
3581
3582 hdr = (void *)skb->data;
3583 tx.sta = sta_info_get(sdata, hdr->addr1);
3584 tx.skb = skb;
3585
3586 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3587 rcu_read_unlock();
3588 kfree_skb(skb);
3589 return ERR_PTR(-EINVAL);
3590 }
3591
3592 out:
3593 rcu_read_unlock();
3594 return skb;
3595 }
3596
3597 /*
3598 * ieee80211_clear_tx_pending may not be called in a context where
3599 * it is possible that it packets could come in again.
3600 */
3601 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3602 {
3603 struct sk_buff *skb;
3604 int i;
3605
3606 for (i = 0; i < local->hw.queues; i++) {
3607 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3608 ieee80211_free_txskb(&local->hw, skb);
3609 }
3610 }
3611
3612 /*
3613 * Returns false if the frame couldn't be transmitted but was queued instead,
3614 * which in this case means re-queued -- take as an indication to stop sending
3615 * more pending frames.
3616 */
3617 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3618 struct sk_buff *skb)
3619 {
3620 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3621 struct ieee80211_sub_if_data *sdata;
3622 struct sta_info *sta;
3623 struct ieee80211_hdr *hdr;
3624 bool result;
3625 struct ieee80211_chanctx_conf *chanctx_conf;
3626
3627 sdata = vif_to_sdata(info->control.vif);
3628
3629 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3630 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3631 if (unlikely(!chanctx_conf)) {
3632 dev_kfree_skb(skb);
3633 return true;
3634 }
3635 info->band = chanctx_conf->def.chan->band;
3636 result = ieee80211_tx(sdata, NULL, skb, true);
3637 } else {
3638 struct sk_buff_head skbs;
3639
3640 __skb_queue_head_init(&skbs);
3641 __skb_queue_tail(&skbs, skb);
3642
3643 hdr = (struct ieee80211_hdr *)skb->data;
3644 sta = sta_info_get(sdata, hdr->addr1);
3645
3646 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3647 }
3648
3649 return result;
3650 }
3651
3652 /*
3653 * Transmit all pending packets. Called from tasklet.
3654 */
3655 void ieee80211_tx_pending(unsigned long data)
3656 {
3657 struct ieee80211_local *local = (struct ieee80211_local *)data;
3658 unsigned long flags;
3659 int i;
3660 bool txok;
3661
3662 rcu_read_lock();
3663
3664 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3665 for (i = 0; i < local->hw.queues; i++) {
3666 /*
3667 * If queue is stopped by something other than due to pending
3668 * frames, or we have no pending frames, proceed to next queue.
3669 */
3670 if (local->queue_stop_reasons[i] ||
3671 skb_queue_empty(&local->pending[i]))
3672 continue;
3673
3674 while (!skb_queue_empty(&local->pending[i])) {
3675 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3676 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3677
3678 if (WARN_ON(!info->control.vif)) {
3679 ieee80211_free_txskb(&local->hw, skb);
3680 continue;
3681 }
3682
3683 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3684 flags);
3685
3686 txok = ieee80211_tx_pending_skb(local, skb);
3687 spin_lock_irqsave(&local->queue_stop_reason_lock,
3688 flags);
3689 if (!txok)
3690 break;
3691 }
3692
3693 if (skb_queue_empty(&local->pending[i]))
3694 ieee80211_propagate_queue_wake(local, i);
3695 }
3696 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3697
3698 rcu_read_unlock();
3699 }
3700
3701 /* functions for drivers to get certain frames */
3702
3703 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3704 struct ps_data *ps, struct sk_buff *skb,
3705 bool is_template)
3706 {
3707 u8 *pos, *tim;
3708 int aid0 = 0;
3709 int i, have_bits = 0, n1, n2;
3710
3711 /* Generate bitmap for TIM only if there are any STAs in power save
3712 * mode. */
3713 if (atomic_read(&ps->num_sta_ps) > 0)
3714 /* in the hope that this is faster than
3715 * checking byte-for-byte */
3716 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3717 IEEE80211_MAX_AID+1);
3718 if (!is_template) {
3719 if (ps->dtim_count == 0)
3720 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3721 else
3722 ps->dtim_count--;
3723 }
3724
3725 tim = pos = (u8 *) skb_put(skb, 6);
3726 *pos++ = WLAN_EID_TIM;
3727 *pos++ = 4;
3728 *pos++ = ps->dtim_count;
3729 *pos++ = sdata->vif.bss_conf.dtim_period;
3730
3731 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3732 aid0 = 1;
3733
3734 ps->dtim_bc_mc = aid0 == 1;
3735
3736 if (have_bits) {
3737 /* Find largest even number N1 so that bits numbered 1 through
3738 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3739 * (N2 + 1) x 8 through 2007 are 0. */
3740 n1 = 0;
3741 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3742 if (ps->tim[i]) {
3743 n1 = i & 0xfe;
3744 break;
3745 }
3746 }
3747 n2 = n1;
3748 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3749 if (ps->tim[i]) {
3750 n2 = i;
3751 break;
3752 }
3753 }
3754
3755 /* Bitmap control */
3756 *pos++ = n1 | aid0;
3757 /* Part Virt Bitmap */
3758 skb_put(skb, n2 - n1);
3759 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3760
3761 tim[1] = n2 - n1 + 4;
3762 } else {
3763 *pos++ = aid0; /* Bitmap control */
3764 *pos++ = 0; /* Part Virt Bitmap */
3765 }
3766 }
3767
3768 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3769 struct ps_data *ps, struct sk_buff *skb,
3770 bool is_template)
3771 {
3772 struct ieee80211_local *local = sdata->local;
3773
3774 /*
3775 * Not very nice, but we want to allow the driver to call
3776 * ieee80211_beacon_get() as a response to the set_tim()
3777 * callback. That, however, is already invoked under the
3778 * sta_lock to guarantee consistent and race-free update
3779 * of the tim bitmap in mac80211 and the driver.
3780 */
3781 if (local->tim_in_locked_section) {
3782 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3783 } else {
3784 spin_lock_bh(&local->tim_lock);
3785 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3786 spin_unlock_bh(&local->tim_lock);
3787 }
3788
3789 return 0;
3790 }
3791
3792 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3793 struct beacon_data *beacon)
3794 {
3795 struct probe_resp *resp;
3796 u8 *beacon_data;
3797 size_t beacon_data_len;
3798 int i;
3799 u8 count = beacon->csa_current_counter;
3800
3801 switch (sdata->vif.type) {
3802 case NL80211_IFTYPE_AP:
3803 beacon_data = beacon->tail;
3804 beacon_data_len = beacon->tail_len;
3805 break;
3806 case NL80211_IFTYPE_ADHOC:
3807 beacon_data = beacon->head;
3808 beacon_data_len = beacon->head_len;
3809 break;
3810 case NL80211_IFTYPE_MESH_POINT:
3811 beacon_data = beacon->head;
3812 beacon_data_len = beacon->head_len;
3813 break;
3814 default:
3815 return;
3816 }
3817
3818 rcu_read_lock();
3819 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3820 resp = rcu_dereference(sdata->u.ap.probe_resp);
3821
3822 if (beacon->csa_counter_offsets[i]) {
3823 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3824 beacon_data_len)) {
3825 rcu_read_unlock();
3826 return;
3827 }
3828
3829 beacon_data[beacon->csa_counter_offsets[i]] = count;
3830 }
3831
3832 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3833 resp->data[resp->csa_counter_offsets[i]] = count;
3834 }
3835 rcu_read_unlock();
3836 }
3837
3838 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3839 {
3840 beacon->csa_current_counter--;
3841
3842 /* the counter should never reach 0 */
3843 WARN_ON_ONCE(!beacon->csa_current_counter);
3844
3845 return beacon->csa_current_counter;
3846 }
3847
3848 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3849 {
3850 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3851 struct beacon_data *beacon = NULL;
3852 u8 count = 0;
3853
3854 rcu_read_lock();
3855
3856 if (sdata->vif.type == NL80211_IFTYPE_AP)
3857 beacon = rcu_dereference(sdata->u.ap.beacon);
3858 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3859 beacon = rcu_dereference(sdata->u.ibss.presp);
3860 else if (ieee80211_vif_is_mesh(&sdata->vif))
3861 beacon = rcu_dereference(sdata->u.mesh.beacon);
3862
3863 if (!beacon)
3864 goto unlock;
3865
3866 count = __ieee80211_csa_update_counter(beacon);
3867
3868 unlock:
3869 rcu_read_unlock();
3870 return count;
3871 }
3872 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3873
3874 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3875 {
3876 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3877 struct beacon_data *beacon = NULL;
3878 u8 *beacon_data;
3879 size_t beacon_data_len;
3880 int ret = false;
3881
3882 if (!ieee80211_sdata_running(sdata))
3883 return false;
3884
3885 rcu_read_lock();
3886 if (vif->type == NL80211_IFTYPE_AP) {
3887 struct ieee80211_if_ap *ap = &sdata->u.ap;
3888
3889 beacon = rcu_dereference(ap->beacon);
3890 if (WARN_ON(!beacon || !beacon->tail))
3891 goto out;
3892 beacon_data = beacon->tail;
3893 beacon_data_len = beacon->tail_len;
3894 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3895 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3896
3897 beacon = rcu_dereference(ifibss->presp);
3898 if (!beacon)
3899 goto out;
3900
3901 beacon_data = beacon->head;
3902 beacon_data_len = beacon->head_len;
3903 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3904 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3905
3906 beacon = rcu_dereference(ifmsh->beacon);
3907 if (!beacon)
3908 goto out;
3909
3910 beacon_data = beacon->head;
3911 beacon_data_len = beacon->head_len;
3912 } else {
3913 WARN_ON(1);
3914 goto out;
3915 }
3916
3917 if (!beacon->csa_counter_offsets[0])
3918 goto out;
3919
3920 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3921 goto out;
3922
3923 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3924 ret = true;
3925 out:
3926 rcu_read_unlock();
3927
3928 return ret;
3929 }
3930 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3931
3932 static struct sk_buff *
3933 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3934 struct ieee80211_vif *vif,
3935 struct ieee80211_mutable_offsets *offs,
3936 bool is_template)
3937 {
3938 struct ieee80211_local *local = hw_to_local(hw);
3939 struct beacon_data *beacon = NULL;
3940 struct sk_buff *skb = NULL;
3941 struct ieee80211_tx_info *info;
3942 struct ieee80211_sub_if_data *sdata = NULL;
3943 enum nl80211_band band;
3944 struct ieee80211_tx_rate_control txrc;
3945 struct ieee80211_chanctx_conf *chanctx_conf;
3946 int csa_off_base = 0;
3947
3948 rcu_read_lock();
3949
3950 sdata = vif_to_sdata(vif);
3951 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3952
3953 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3954 goto out;
3955
3956 if (offs)
3957 memset(offs, 0, sizeof(*offs));
3958
3959 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3960 struct ieee80211_if_ap *ap = &sdata->u.ap;
3961
3962 beacon = rcu_dereference(ap->beacon);
3963 if (beacon) {
3964 if (beacon->csa_counter_offsets[0]) {
3965 if (!is_template)
3966 __ieee80211_csa_update_counter(beacon);
3967
3968 ieee80211_set_csa(sdata, beacon);
3969 }
3970
3971 /*
3972 * headroom, head length,
3973 * tail length and maximum TIM length
3974 */
3975 skb = dev_alloc_skb(local->tx_headroom +
3976 beacon->head_len +
3977 beacon->tail_len + 256 +
3978 local->hw.extra_beacon_tailroom);
3979 if (!skb)
3980 goto out;
3981
3982 skb_reserve(skb, local->tx_headroom);
3983 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3984 beacon->head_len);
3985
3986 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3987 is_template);
3988
3989 if (offs) {
3990 offs->tim_offset = beacon->head_len;
3991 offs->tim_length = skb->len - beacon->head_len;
3992
3993 /* for AP the csa offsets are from tail */
3994 csa_off_base = skb->len;
3995 }
3996
3997 if (beacon->tail)
3998 memcpy(skb_put(skb, beacon->tail_len),
3999 beacon->tail, beacon->tail_len);
4000 } else
4001 goto out;
4002 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4003 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4004 struct ieee80211_hdr *hdr;
4005
4006 beacon = rcu_dereference(ifibss->presp);
4007 if (!beacon)
4008 goto out;
4009
4010 if (beacon->csa_counter_offsets[0]) {
4011 if (!is_template)
4012 __ieee80211_csa_update_counter(beacon);
4013
4014 ieee80211_set_csa(sdata, beacon);
4015 }
4016
4017 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4018 local->hw.extra_beacon_tailroom);
4019 if (!skb)
4020 goto out;
4021 skb_reserve(skb, local->tx_headroom);
4022 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4023 beacon->head_len);
4024
4025 hdr = (struct ieee80211_hdr *) skb->data;
4026 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4027 IEEE80211_STYPE_BEACON);
4028 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4029 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4030
4031 beacon = rcu_dereference(ifmsh->beacon);
4032 if (!beacon)
4033 goto out;
4034
4035 if (beacon->csa_counter_offsets[0]) {
4036 if (!is_template)
4037 /* TODO: For mesh csa_counter is in TU, so
4038 * decrementing it by one isn't correct, but
4039 * for now we leave it consistent with overall
4040 * mac80211's behavior.
4041 */
4042 __ieee80211_csa_update_counter(beacon);
4043
4044 ieee80211_set_csa(sdata, beacon);
4045 }
4046
4047 if (ifmsh->sync_ops)
4048 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
4049
4050 skb = dev_alloc_skb(local->tx_headroom +
4051 beacon->head_len +
4052 256 + /* TIM IE */
4053 beacon->tail_len +
4054 local->hw.extra_beacon_tailroom);
4055 if (!skb)
4056 goto out;
4057 skb_reserve(skb, local->tx_headroom);
4058 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4059 beacon->head_len);
4060 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4061
4062 if (offs) {
4063 offs->tim_offset = beacon->head_len;
4064 offs->tim_length = skb->len - beacon->head_len;
4065 }
4066
4067 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
4068 beacon->tail_len);
4069 } else {
4070 WARN_ON(1);
4071 goto out;
4072 }
4073
4074 /* CSA offsets */
4075 if (offs && beacon) {
4076 int i;
4077
4078 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4079 u16 csa_off = beacon->csa_counter_offsets[i];
4080
4081 if (!csa_off)
4082 continue;
4083
4084 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4085 }
4086 }
4087
4088 band = chanctx_conf->def.chan->band;
4089
4090 info = IEEE80211_SKB_CB(skb);
4091
4092 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4093 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4094 info->band = band;
4095
4096 memset(&txrc, 0, sizeof(txrc));
4097 txrc.hw = hw;
4098 txrc.sband = local->hw.wiphy->bands[band];
4099 txrc.bss_conf = &sdata->vif.bss_conf;
4100 txrc.skb = skb;
4101 txrc.reported_rate.idx = -1;
4102 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4103 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
4104 txrc.max_rate_idx = -1;
4105 else
4106 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
4107 txrc.bss = true;
4108 rate_control_get_rate(sdata, NULL, &txrc);
4109
4110 info->control.vif = vif;
4111
4112 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4113 IEEE80211_TX_CTL_ASSIGN_SEQ |
4114 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4115 out:
4116 rcu_read_unlock();
4117 return skb;
4118
4119 }
4120
4121 struct sk_buff *
4122 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4123 struct ieee80211_vif *vif,
4124 struct ieee80211_mutable_offsets *offs)
4125 {
4126 return __ieee80211_beacon_get(hw, vif, offs, true);
4127 }
4128 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4129
4130 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4131 struct ieee80211_vif *vif,
4132 u16 *tim_offset, u16 *tim_length)
4133 {
4134 struct ieee80211_mutable_offsets offs = {};
4135 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4136 struct sk_buff *copy;
4137 struct ieee80211_supported_band *sband;
4138 int shift;
4139
4140 if (!bcn)
4141 return bcn;
4142
4143 if (tim_offset)
4144 *tim_offset = offs.tim_offset;
4145
4146 if (tim_length)
4147 *tim_length = offs.tim_length;
4148
4149 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4150 !hw_to_local(hw)->monitors)
4151 return bcn;
4152
4153 /* send a copy to monitor interfaces */
4154 copy = skb_copy(bcn, GFP_ATOMIC);
4155 if (!copy)
4156 return bcn;
4157
4158 shift = ieee80211_vif_get_shift(vif);
4159 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
4160 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4161
4162 return bcn;
4163 }
4164 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4165
4166 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4167 struct ieee80211_vif *vif)
4168 {
4169 struct ieee80211_if_ap *ap = NULL;
4170 struct sk_buff *skb = NULL;
4171 struct probe_resp *presp = NULL;
4172 struct ieee80211_hdr *hdr;
4173 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4174
4175 if (sdata->vif.type != NL80211_IFTYPE_AP)
4176 return NULL;
4177
4178 rcu_read_lock();
4179
4180 ap = &sdata->u.ap;
4181 presp = rcu_dereference(ap->probe_resp);
4182 if (!presp)
4183 goto out;
4184
4185 skb = dev_alloc_skb(presp->len);
4186 if (!skb)
4187 goto out;
4188
4189 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
4190
4191 hdr = (struct ieee80211_hdr *) skb->data;
4192 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4193
4194 out:
4195 rcu_read_unlock();
4196 return skb;
4197 }
4198 EXPORT_SYMBOL(ieee80211_proberesp_get);
4199
4200 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4201 struct ieee80211_vif *vif)
4202 {
4203 struct ieee80211_sub_if_data *sdata;
4204 struct ieee80211_if_managed *ifmgd;
4205 struct ieee80211_pspoll *pspoll;
4206 struct ieee80211_local *local;
4207 struct sk_buff *skb;
4208
4209 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4210 return NULL;
4211
4212 sdata = vif_to_sdata(vif);
4213 ifmgd = &sdata->u.mgd;
4214 local = sdata->local;
4215
4216 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4217 if (!skb)
4218 return NULL;
4219
4220 skb_reserve(skb, local->hw.extra_tx_headroom);
4221
4222 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
4223 memset(pspoll, 0, sizeof(*pspoll));
4224 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4225 IEEE80211_STYPE_PSPOLL);
4226 pspoll->aid = cpu_to_le16(ifmgd->aid);
4227
4228 /* aid in PS-Poll has its two MSBs each set to 1 */
4229 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4230
4231 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4232 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4233
4234 return skb;
4235 }
4236 EXPORT_SYMBOL(ieee80211_pspoll_get);
4237
4238 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4239 struct ieee80211_vif *vif)
4240 {
4241 struct ieee80211_hdr_3addr *nullfunc;
4242 struct ieee80211_sub_if_data *sdata;
4243 struct ieee80211_if_managed *ifmgd;
4244 struct ieee80211_local *local;
4245 struct sk_buff *skb;
4246
4247 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4248 return NULL;
4249
4250 sdata = vif_to_sdata(vif);
4251 ifmgd = &sdata->u.mgd;
4252 local = sdata->local;
4253
4254 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
4255 if (!skb)
4256 return NULL;
4257
4258 skb_reserve(skb, local->hw.extra_tx_headroom);
4259
4260 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
4261 sizeof(*nullfunc));
4262 memset(nullfunc, 0, sizeof(*nullfunc));
4263 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4264 IEEE80211_STYPE_NULLFUNC |
4265 IEEE80211_FCTL_TODS);
4266 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4267 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4268 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4269
4270 return skb;
4271 }
4272 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4273
4274 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4275 const u8 *src_addr,
4276 const u8 *ssid, size_t ssid_len,
4277 size_t tailroom)
4278 {
4279 struct ieee80211_local *local = hw_to_local(hw);
4280 struct ieee80211_hdr_3addr *hdr;
4281 struct sk_buff *skb;
4282 size_t ie_ssid_len;
4283 u8 *pos;
4284
4285 ie_ssid_len = 2 + ssid_len;
4286
4287 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4288 ie_ssid_len + tailroom);
4289 if (!skb)
4290 return NULL;
4291
4292 skb_reserve(skb, local->hw.extra_tx_headroom);
4293
4294 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
4295 memset(hdr, 0, sizeof(*hdr));
4296 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4297 IEEE80211_STYPE_PROBE_REQ);
4298 eth_broadcast_addr(hdr->addr1);
4299 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4300 eth_broadcast_addr(hdr->addr3);
4301
4302 pos = skb_put(skb, ie_ssid_len);
4303 *pos++ = WLAN_EID_SSID;
4304 *pos++ = ssid_len;
4305 if (ssid_len)
4306 memcpy(pos, ssid, ssid_len);
4307 pos += ssid_len;
4308
4309 return skb;
4310 }
4311 EXPORT_SYMBOL(ieee80211_probereq_get);
4312
4313 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4314 const void *frame, size_t frame_len,
4315 const struct ieee80211_tx_info *frame_txctl,
4316 struct ieee80211_rts *rts)
4317 {
4318 const struct ieee80211_hdr *hdr = frame;
4319
4320 rts->frame_control =
4321 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4322 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4323 frame_txctl);
4324 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4325 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4326 }
4327 EXPORT_SYMBOL(ieee80211_rts_get);
4328
4329 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4330 const void *frame, size_t frame_len,
4331 const struct ieee80211_tx_info *frame_txctl,
4332 struct ieee80211_cts *cts)
4333 {
4334 const struct ieee80211_hdr *hdr = frame;
4335
4336 cts->frame_control =
4337 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4338 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4339 frame_len, frame_txctl);
4340 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4341 }
4342 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4343
4344 struct sk_buff *
4345 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4346 struct ieee80211_vif *vif)
4347 {
4348 struct ieee80211_local *local = hw_to_local(hw);
4349 struct sk_buff *skb = NULL;
4350 struct ieee80211_tx_data tx;
4351 struct ieee80211_sub_if_data *sdata;
4352 struct ps_data *ps;
4353 struct ieee80211_tx_info *info;
4354 struct ieee80211_chanctx_conf *chanctx_conf;
4355
4356 sdata = vif_to_sdata(vif);
4357
4358 rcu_read_lock();
4359 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4360
4361 if (!chanctx_conf)
4362 goto out;
4363
4364 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4365 struct beacon_data *beacon =
4366 rcu_dereference(sdata->u.ap.beacon);
4367
4368 if (!beacon || !beacon->head)
4369 goto out;
4370
4371 ps = &sdata->u.ap.ps;
4372 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4373 ps = &sdata->u.mesh.ps;
4374 } else {
4375 goto out;
4376 }
4377
4378 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4379 goto out; /* send buffered bc/mc only after DTIM beacon */
4380
4381 while (1) {
4382 skb = skb_dequeue(&ps->bc_buf);
4383 if (!skb)
4384 goto out;
4385 local->total_ps_buffered--;
4386
4387 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4388 struct ieee80211_hdr *hdr =
4389 (struct ieee80211_hdr *) skb->data;
4390 /* more buffered multicast/broadcast frames ==> set
4391 * MoreData flag in IEEE 802.11 header to inform PS
4392 * STAs */
4393 hdr->frame_control |=
4394 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4395 }
4396
4397 if (sdata->vif.type == NL80211_IFTYPE_AP)
4398 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4399 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4400 break;
4401 ieee80211_free_txskb(hw, skb);
4402 }
4403
4404 info = IEEE80211_SKB_CB(skb);
4405
4406 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4407 info->band = chanctx_conf->def.chan->band;
4408
4409 if (invoke_tx_handlers(&tx))
4410 skb = NULL;
4411 out:
4412 rcu_read_unlock();
4413
4414 return skb;
4415 }
4416 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4417
4418 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4419 {
4420 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4421 struct ieee80211_sub_if_data *sdata = sta->sdata;
4422 struct ieee80211_local *local = sdata->local;
4423 int ret;
4424 u32 queues;
4425
4426 lockdep_assert_held(&local->sta_mtx);
4427
4428 /* only some cases are supported right now */
4429 switch (sdata->vif.type) {
4430 case NL80211_IFTYPE_STATION:
4431 case NL80211_IFTYPE_AP:
4432 case NL80211_IFTYPE_AP_VLAN:
4433 break;
4434 default:
4435 WARN_ON(1);
4436 return -EINVAL;
4437 }
4438
4439 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4440 return -EINVAL;
4441
4442 if (sta->reserved_tid == tid) {
4443 ret = 0;
4444 goto out;
4445 }
4446
4447 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4448 sdata_err(sdata, "TID reservation already active\n");
4449 ret = -EALREADY;
4450 goto out;
4451 }
4452
4453 ieee80211_stop_vif_queues(sdata->local, sdata,
4454 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4455
4456 synchronize_net();
4457
4458 /* Tear down BA sessions so we stop aggregating on this TID */
4459 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4460 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4461 __ieee80211_stop_tx_ba_session(sta, tid,
4462 AGG_STOP_LOCAL_REQUEST);
4463 }
4464
4465 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4466 __ieee80211_flush_queues(local, sdata, queues, false);
4467
4468 sta->reserved_tid = tid;
4469
4470 ieee80211_wake_vif_queues(local, sdata,
4471 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4472
4473 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4474 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4475
4476 ret = 0;
4477 out:
4478 return ret;
4479 }
4480 EXPORT_SYMBOL(ieee80211_reserve_tid);
4481
4482 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4483 {
4484 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4485 struct ieee80211_sub_if_data *sdata = sta->sdata;
4486
4487 lockdep_assert_held(&sdata->local->sta_mtx);
4488
4489 /* only some cases are supported right now */
4490 switch (sdata->vif.type) {
4491 case NL80211_IFTYPE_STATION:
4492 case NL80211_IFTYPE_AP:
4493 case NL80211_IFTYPE_AP_VLAN:
4494 break;
4495 default:
4496 WARN_ON(1);
4497 return;
4498 }
4499
4500 if (tid != sta->reserved_tid) {
4501 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4502 return;
4503 }
4504
4505 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4506 }
4507 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4508
4509 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4510 struct sk_buff *skb, int tid,
4511 enum nl80211_band band)
4512 {
4513 int ac = ieee802_1d_to_ac[tid & 7];
4514
4515 skb_reset_mac_header(skb);
4516 skb_set_queue_mapping(skb, ac);
4517 skb->priority = tid;
4518
4519 skb->dev = sdata->dev;
4520
4521 /*
4522 * The other path calling ieee80211_xmit is from the tasklet,
4523 * and while we can handle concurrent transmissions locking
4524 * requirements are that we do not come into tx with bhs on.
4525 */
4526 local_bh_disable();
4527 IEEE80211_SKB_CB(skb)->band = band;
4528 ieee80211_xmit(sdata, NULL, skb);
4529 local_bh_enable();
4530 }
Linux with added FPC-III support