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powerpc/powernv: Report size of OPAL memcons log
[linux/fpc-iii.git] / net / mac80211 / tx.c
blob797e847cbc49a1a5f1a515f01aa68c0212aed997
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(ieee80211_is_data(hdr->frame_control) &&
335 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
336 /*
337 * No associated STAs - no need to send multicast
338 * frames.
339 */
340 return TX_DROP;
341 }
342
343 return TX_CONTINUE;
344 }
345
346 /* This function is called whenever the AP is about to exceed the maximum limit
347 * of buffered frames for power saving STAs. This situation should not really
348 * happen often during normal operation, so dropping the oldest buffered packet
349 * from each queue should be OK to make some room for new frames. */
350 static void purge_old_ps_buffers(struct ieee80211_local *local)
351 {
352 int total = 0, purged = 0;
353 struct sk_buff *skb;
354 struct ieee80211_sub_if_data *sdata;
355 struct sta_info *sta;
356
357 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
358 struct ps_data *ps;
359
360 if (sdata->vif.type == NL80211_IFTYPE_AP)
361 ps = &sdata->u.ap.ps;
362 else if (ieee80211_vif_is_mesh(&sdata->vif))
363 ps = &sdata->u.mesh.ps;
364 else
365 continue;
366
367 skb = skb_dequeue(&ps->bc_buf);
368 if (skb) {
369 purged++;
370 ieee80211_free_txskb(&local->hw, skb);
371 }
372 total += skb_queue_len(&ps->bc_buf);
373 }
374
375 /*
376 * Drop one frame from each station from the lowest-priority
377 * AC that has frames at all.
378 */
379 list_for_each_entry_rcu(sta, &local->sta_list, list) {
380 int ac;
381
382 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
383 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
384 total += skb_queue_len(&sta->ps_tx_buf[ac]);
385 if (skb) {
386 purged++;
387 ieee80211_free_txskb(&local->hw, skb);
388 break;
389 }
390 }
391 }
392
393 local->total_ps_buffered = total;
394 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
395 }
396
397 static ieee80211_tx_result
398 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
399 {
400 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
401 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
402 struct ps_data *ps;
403
404 /*
405 * broadcast/multicast frame
406 *
407 * If any of the associated/peer stations is in power save mode,
408 * the frame is buffered to be sent after DTIM beacon frame.
409 * This is done either by the hardware or us.
410 */
411
412 /* powersaving STAs currently only in AP/VLAN/mesh mode */
413 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
414 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
415 if (!tx->sdata->bss)
416 return TX_CONTINUE;
417
418 ps = &tx->sdata->bss->ps;
419 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
420 ps = &tx->sdata->u.mesh.ps;
421 } else {
422 return TX_CONTINUE;
423 }
424
425
426 /* no buffering for ordered frames */
427 if (ieee80211_has_order(hdr->frame_control))
428 return TX_CONTINUE;
429
430 if (ieee80211_is_probe_req(hdr->frame_control))
431 return TX_CONTINUE;
432
433 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
434 info->hw_queue = tx->sdata->vif.cab_queue;
435
436 /* no stations in PS mode */
437 if (!atomic_read(&ps->num_sta_ps))
438 return TX_CONTINUE;
439
440 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
441
442 /* device releases frame after DTIM beacon */
443 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
444 return TX_CONTINUE;
445
446 /* buffered in mac80211 */
447 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
448 purge_old_ps_buffers(tx->local);
449
450 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
451 ps_dbg(tx->sdata,
452 "BC TX buffer full - dropping the oldest frame\n");
453 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
454 } else
455 tx->local->total_ps_buffered++;
456
457 skb_queue_tail(&ps->bc_buf, tx->skb);
458
459 return TX_QUEUED;
460 }
461
462 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
463 struct sk_buff *skb)
464 {
465 if (!ieee80211_is_mgmt(fc))
466 return 0;
467
468 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
469 return 0;
470
471 if (!ieee80211_is_robust_mgmt_frame(skb))
472 return 0;
473
474 return 1;
475 }
476
477 static ieee80211_tx_result
478 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
479 {
480 struct sta_info *sta = tx->sta;
481 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
482 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
483 struct ieee80211_local *local = tx->local;
484
485 if (unlikely(!sta))
486 return TX_CONTINUE;
487
488 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
489 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
490 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
491 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
492 int ac = skb_get_queue_mapping(tx->skb);
493
494 if (ieee80211_is_mgmt(hdr->frame_control) &&
495 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
496 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
497 return TX_CONTINUE;
498 }
499
500 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
501 sta->sta.addr, sta->sta.aid, ac);
502 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
503 purge_old_ps_buffers(tx->local);
504
505 /* sync with ieee80211_sta_ps_deliver_wakeup */
506 spin_lock(&sta->ps_lock);
507 /*
508 * STA woke up the meantime and all the frames on ps_tx_buf have
509 * been queued to pending queue. No reordering can happen, go
510 * ahead and Tx the packet.
511 */
512 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
513 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
514 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
515 spin_unlock(&sta->ps_lock);
516 return TX_CONTINUE;
517 }
518
519 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
520 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
521 ps_dbg(tx->sdata,
522 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
523 sta->sta.addr, ac);
524 ieee80211_free_txskb(&local->hw, old);
525 } else
526 tx->local->total_ps_buffered++;
527
528 info->control.jiffies = jiffies;
529 info->control.vif = &tx->sdata->vif;
530 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
531 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
532 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
533 spin_unlock(&sta->ps_lock);
534
535 if (!timer_pending(&local->sta_cleanup))
536 mod_timer(&local->sta_cleanup,
537 round_jiffies(jiffies +
538 STA_INFO_CLEANUP_INTERVAL));
539
540 /*
541 * We queued up some frames, so the TIM bit might
542 * need to be set, recalculate it.
543 */
544 sta_info_recalc_tim(sta);
545
546 return TX_QUEUED;
547 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
548 ps_dbg(tx->sdata,
549 "STA %pM in PS mode, but polling/in SP -> send frame\n",
550 sta->sta.addr);
551 }
552
553 return TX_CONTINUE;
554 }
555
556 static ieee80211_tx_result debug_noinline
557 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
558 {
559 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
560 return TX_CONTINUE;
561
562 if (tx->flags & IEEE80211_TX_UNICAST)
563 return ieee80211_tx_h_unicast_ps_buf(tx);
564 else
565 return ieee80211_tx_h_multicast_ps_buf(tx);
566 }
567
568 static ieee80211_tx_result debug_noinline
569 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
570 {
571 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
572
573 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
574 if (tx->sdata->control_port_no_encrypt)
575 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
576 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
577 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
578 }
579
580 return TX_CONTINUE;
581 }
582
583 static ieee80211_tx_result debug_noinline
584 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
585 {
586 struct ieee80211_key *key;
587 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
588 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
589
590 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
591 tx->key = NULL;
592 else if (tx->sta &&
593 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
594 tx->key = key;
595 else if (ieee80211_is_group_privacy_action(tx->skb) &&
596 (key = rcu_dereference(tx->sdata->default_multicast_key)))
597 tx->key = key;
598 else if (ieee80211_is_mgmt(hdr->frame_control) &&
599 is_multicast_ether_addr(hdr->addr1) &&
600 ieee80211_is_robust_mgmt_frame(tx->skb) &&
601 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
602 tx->key = key;
603 else if (is_multicast_ether_addr(hdr->addr1) &&
604 (key = rcu_dereference(tx->sdata->default_multicast_key)))
605 tx->key = key;
606 else if (!is_multicast_ether_addr(hdr->addr1) &&
607 (key = rcu_dereference(tx->sdata->default_unicast_key)))
608 tx->key = key;
609 else
610 tx->key = NULL;
611
612 if (tx->key) {
613 bool skip_hw = false;
614
615 /* TODO: add threshold stuff again */
616
617 switch (tx->key->conf.cipher) {
618 case WLAN_CIPHER_SUITE_WEP40:
619 case WLAN_CIPHER_SUITE_WEP104:
620 case WLAN_CIPHER_SUITE_TKIP:
621 if (!ieee80211_is_data_present(hdr->frame_control))
622 tx->key = NULL;
623 break;
624 case WLAN_CIPHER_SUITE_CCMP:
625 case WLAN_CIPHER_SUITE_CCMP_256:
626 case WLAN_CIPHER_SUITE_GCMP:
627 case WLAN_CIPHER_SUITE_GCMP_256:
628 if (!ieee80211_is_data_present(hdr->frame_control) &&
629 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
630 tx->skb) &&
631 !ieee80211_is_group_privacy_action(tx->skb))
632 tx->key = NULL;
633 else
634 skip_hw = (tx->key->conf.flags &
635 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
636 ieee80211_is_mgmt(hdr->frame_control);
637 break;
638 case WLAN_CIPHER_SUITE_AES_CMAC:
639 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
640 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
641 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
642 if (!ieee80211_is_mgmt(hdr->frame_control))
643 tx->key = NULL;
644 break;
645 }
646
647 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
648 !ieee80211_is_deauth(hdr->frame_control)))
649 return TX_DROP;
650
651 if (!skip_hw && tx->key &&
652 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
653 info->control.hw_key = &tx->key->conf;
654 }
655
656 return TX_CONTINUE;
657 }
658
659 static ieee80211_tx_result debug_noinline
660 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
661 {
662 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
663 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
664 struct ieee80211_supported_band *sband;
665 u32 len;
666 struct ieee80211_tx_rate_control txrc;
667 struct ieee80211_sta_rates *ratetbl = NULL;
668 bool assoc = false;
669
670 memset(&txrc, 0, sizeof(txrc));
671
672 sband = tx->local->hw.wiphy->bands[info->band];
673
674 len = min_t(u32, tx->skb->len + FCS_LEN,
675 tx->local->hw.wiphy->frag_threshold);
676
677 /* set up the tx rate control struct we give the RC algo */
678 txrc.hw = &tx->local->hw;
679 txrc.sband = sband;
680 txrc.bss_conf = &tx->sdata->vif.bss_conf;
681 txrc.skb = tx->skb;
682 txrc.reported_rate.idx = -1;
683 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
684 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
685 txrc.max_rate_idx = -1;
686 else
687 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
688
689 if (tx->sdata->rc_has_mcs_mask[info->band])
690 txrc.rate_idx_mcs_mask =
691 tx->sdata->rc_rateidx_mcs_mask[info->band];
692
693 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
694 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
695 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
696 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
697
698 /* set up RTS protection if desired */
699 if (len > tx->local->hw.wiphy->rts_threshold) {
700 txrc.rts = true;
701 }
702
703 info->control.use_rts = txrc.rts;
704 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
705
706 /*
707 * Use short preamble if the BSS can handle it, but not for
708 * management frames unless we know the receiver can handle
709 * that -- the management frame might be to a station that
710 * just wants a probe response.
711 */
712 if (tx->sdata->vif.bss_conf.use_short_preamble &&
713 (ieee80211_is_data(hdr->frame_control) ||
714 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
715 txrc.short_preamble = true;
716
717 info->control.short_preamble = txrc.short_preamble;
718
719 /* don't ask rate control when rate already injected via radiotap */
720 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
721 return TX_CONTINUE;
722
723 if (tx->sta)
724 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
725
726 /*
727 * Lets not bother rate control if we're associated and cannot
728 * talk to the sta. This should not happen.
729 */
730 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
731 !rate_usable_index_exists(sband, &tx->sta->sta),
732 "%s: Dropped data frame as no usable bitrate found while "
733 "scanning and associated. Target station: "
734 "%pM on %d GHz band\n",
735 tx->sdata->name, hdr->addr1,
736 info->band ? 5 : 2))
737 return TX_DROP;
738
739 /*
740 * If we're associated with the sta at this point we know we can at
741 * least send the frame at the lowest bit rate.
742 */
743 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
744
745 if (tx->sta && !info->control.skip_table)
746 ratetbl = rcu_dereference(tx->sta->sta.rates);
747
748 if (unlikely(info->control.rates[0].idx < 0)) {
749 if (ratetbl) {
750 struct ieee80211_tx_rate rate = {
751 .idx = ratetbl->rate[0].idx,
752 .flags = ratetbl->rate[0].flags,
753 .count = ratetbl->rate[0].count
754 };
755
756 if (ratetbl->rate[0].idx < 0)
757 return TX_DROP;
758
759 tx->rate = rate;
760 } else {
761 return TX_DROP;
762 }
763 } else {
764 tx->rate = info->control.rates[0];
765 }
766
767 if (txrc.reported_rate.idx < 0) {
768 txrc.reported_rate = tx->rate;
769 if (tx->sta && ieee80211_is_data(hdr->frame_control))
770 tx->sta->tx_stats.last_rate = txrc.reported_rate;
771 } else if (tx->sta)
772 tx->sta->tx_stats.last_rate = txrc.reported_rate;
773
774 if (ratetbl)
775 return TX_CONTINUE;
776
777 if (unlikely(!info->control.rates[0].count))
778 info->control.rates[0].count = 1;
779
780 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
781 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
782 info->control.rates[0].count = 1;
783
784 return TX_CONTINUE;
785 }
786
787 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
788 {
789 u16 *seq = &sta->tid_seq[tid];
790 __le16 ret = cpu_to_le16(*seq);
791
792 /* Increase the sequence number. */
793 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
794
795 return ret;
796 }
797
798 static ieee80211_tx_result debug_noinline
799 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
800 {
801 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
802 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
803 u8 *qc;
804 int tid;
805
806 /*
807 * Packet injection may want to control the sequence
808 * number, if we have no matching interface then we
809 * neither assign one ourselves nor ask the driver to.
810 */
811 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
812 return TX_CONTINUE;
813
814 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
815 return TX_CONTINUE;
816
817 if (ieee80211_hdrlen(hdr->frame_control) < 24)
818 return TX_CONTINUE;
819
820 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
821 return TX_CONTINUE;
822
823 /*
824 * Anything but QoS data that has a sequence number field
825 * (is long enough) gets a sequence number from the global
826 * counter. QoS data frames with a multicast destination
827 * also use the global counter (802.11-2012 9.3.2.10).
828 */
829 if (!ieee80211_is_data_qos(hdr->frame_control) ||
830 is_multicast_ether_addr(hdr->addr1)) {
831 /* driver should assign sequence number */
832 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
833 /* for pure STA mode without beacons, we can do it */
834 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
835 tx->sdata->sequence_number += 0x10;
836 if (tx->sta)
837 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
838 return TX_CONTINUE;
839 }
840
841 /*
842 * This should be true for injected/management frames only, for
843 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
844 * above since they are not QoS-data frames.
845 */
846 if (!tx->sta)
847 return TX_CONTINUE;
848
849 /* include per-STA, per-TID sequence counter */
850
851 qc = ieee80211_get_qos_ctl(hdr);
852 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
853 tx->sta->tx_stats.msdu[tid]++;
854
855 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
856
857 return TX_CONTINUE;
858 }
859
860 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
861 struct sk_buff *skb, int hdrlen,
862 int frag_threshold)
863 {
864 struct ieee80211_local *local = tx->local;
865 struct ieee80211_tx_info *info;
866 struct sk_buff *tmp;
867 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
868 int pos = hdrlen + per_fragm;
869 int rem = skb->len - hdrlen - per_fragm;
870
871 if (WARN_ON(rem < 0))
872 return -EINVAL;
873
874 /* first fragment was already added to queue by caller */
875
876 while (rem) {
877 int fraglen = per_fragm;
878
879 if (fraglen > rem)
880 fraglen = rem;
881 rem -= fraglen;
882 tmp = dev_alloc_skb(local->tx_headroom +
883 frag_threshold +
884 tx->sdata->encrypt_headroom +
885 IEEE80211_ENCRYPT_TAILROOM);
886 if (!tmp)
887 return -ENOMEM;
888
889 __skb_queue_tail(&tx->skbs, tmp);
890
891 skb_reserve(tmp,
892 local->tx_headroom + tx->sdata->encrypt_headroom);
893
894 /* copy control information */
895 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
896
897 info = IEEE80211_SKB_CB(tmp);
898 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
899 IEEE80211_TX_CTL_FIRST_FRAGMENT);
900
901 if (rem)
902 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
903
904 skb_copy_queue_mapping(tmp, skb);
905 tmp->priority = skb->priority;
906 tmp->dev = skb->dev;
907
908 /* copy header and data */
909 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
910 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
911
912 pos += fraglen;
913 }
914
915 /* adjust first fragment's length */
916 skb_trim(skb, hdrlen + per_fragm);
917 return 0;
918 }
919
920 static ieee80211_tx_result debug_noinline
921 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
922 {
923 struct sk_buff *skb = tx->skb;
924 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
925 struct ieee80211_hdr *hdr = (void *)skb->data;
926 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
927 int hdrlen;
928 int fragnum;
929
930 /* no matter what happens, tx->skb moves to tx->skbs */
931 __skb_queue_tail(&tx->skbs, skb);
932 tx->skb = NULL;
933
934 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
935 return TX_CONTINUE;
936
937 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
938 return TX_CONTINUE;
939
940 /*
941 * Warn when submitting a fragmented A-MPDU frame and drop it.
942 * This scenario is handled in ieee80211_tx_prepare but extra
943 * caution taken here as fragmented ampdu may cause Tx stop.
944 */
945 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
946 return TX_DROP;
947
948 hdrlen = ieee80211_hdrlen(hdr->frame_control);
949
950 /* internal error, why isn't DONTFRAG set? */
951 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
952 return TX_DROP;
953
954 /*
955 * Now fragment the frame. This will allocate all the fragments and
956 * chain them (using skb as the first fragment) to skb->next.
957 * During transmission, we will remove the successfully transmitted
958 * fragments from this list. When the low-level driver rejects one
959 * of the fragments then we will simply pretend to accept the skb
960 * but store it away as pending.
961 */
962 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
963 return TX_DROP;
964
965 /* update duration/seq/flags of fragments */
966 fragnum = 0;
967
968 skb_queue_walk(&tx->skbs, skb) {
969 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
970
971 hdr = (void *)skb->data;
972 info = IEEE80211_SKB_CB(skb);
973
974 if (!skb_queue_is_last(&tx->skbs, skb)) {
975 hdr->frame_control |= morefrags;
976 /*
977 * No multi-rate retries for fragmented frames, that
978 * would completely throw off the NAV at other STAs.
979 */
980 info->control.rates[1].idx = -1;
981 info->control.rates[2].idx = -1;
982 info->control.rates[3].idx = -1;
983 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
984 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
985 } else {
986 hdr->frame_control &= ~morefrags;
987 }
988 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
989 fragnum++;
990 }
991
992 return TX_CONTINUE;
993 }
994
995 static ieee80211_tx_result debug_noinline
996 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
997 {
998 struct sk_buff *skb;
999 int ac = -1;
1000
1001 if (!tx->sta)
1002 return TX_CONTINUE;
1003
1004 skb_queue_walk(&tx->skbs, skb) {
1005 ac = skb_get_queue_mapping(skb);
1006 tx->sta->tx_stats.bytes[ac] += skb->len;
1007 }
1008 if (ac >= 0)
1009 tx->sta->tx_stats.packets[ac]++;
1010
1011 return TX_CONTINUE;
1012 }
1013
1014 static ieee80211_tx_result debug_noinline
1015 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1016 {
1017 if (!tx->key)
1018 return TX_CONTINUE;
1019
1020 switch (tx->key->conf.cipher) {
1021 case WLAN_CIPHER_SUITE_WEP40:
1022 case WLAN_CIPHER_SUITE_WEP104:
1023 return ieee80211_crypto_wep_encrypt(tx);
1024 case WLAN_CIPHER_SUITE_TKIP:
1025 return ieee80211_crypto_tkip_encrypt(tx);
1026 case WLAN_CIPHER_SUITE_CCMP:
1027 return ieee80211_crypto_ccmp_encrypt(
1028 tx, IEEE80211_CCMP_MIC_LEN);
1029 case WLAN_CIPHER_SUITE_CCMP_256:
1030 return ieee80211_crypto_ccmp_encrypt(
1031 tx, IEEE80211_CCMP_256_MIC_LEN);
1032 case WLAN_CIPHER_SUITE_AES_CMAC:
1033 return ieee80211_crypto_aes_cmac_encrypt(tx);
1034 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1035 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1036 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1037 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1038 return ieee80211_crypto_aes_gmac_encrypt(tx);
1039 case WLAN_CIPHER_SUITE_GCMP:
1040 case WLAN_CIPHER_SUITE_GCMP_256:
1041 return ieee80211_crypto_gcmp_encrypt(tx);
1042 default:
1043 return ieee80211_crypto_hw_encrypt(tx);
1044 }
1045
1046 return TX_DROP;
1047 }
1048
1049 static ieee80211_tx_result debug_noinline
1050 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1051 {
1052 struct sk_buff *skb;
1053 struct ieee80211_hdr *hdr;
1054 int next_len;
1055 bool group_addr;
1056
1057 skb_queue_walk(&tx->skbs, skb) {
1058 hdr = (void *) skb->data;
1059 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1060 break; /* must not overwrite AID */
1061 if (!skb_queue_is_last(&tx->skbs, skb)) {
1062 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1063 next_len = next->len;
1064 } else
1065 next_len = 0;
1066 group_addr = is_multicast_ether_addr(hdr->addr1);
1067
1068 hdr->duration_id =
1069 ieee80211_duration(tx, skb, group_addr, next_len);
1070 }
1071
1072 return TX_CONTINUE;
1073 }
1074
1075 /* actual transmit path */
1076
1077 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1078 struct sk_buff *skb,
1079 struct ieee80211_tx_info *info,
1080 struct tid_ampdu_tx *tid_tx,
1081 int tid)
1082 {
1083 bool queued = false;
1084 bool reset_agg_timer = false;
1085 struct sk_buff *purge_skb = NULL;
1086
1087 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1088 info->flags |= IEEE80211_TX_CTL_AMPDU;
1089 reset_agg_timer = true;
1090 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1091 /*
1092 * nothing -- this aggregation session is being started
1093 * but that might still fail with the driver
1094 */
1095 } else if (!tx->sta->sta.txq[tid]) {
1096 spin_lock(&tx->sta->lock);
1097 /*
1098 * Need to re-check now, because we may get here
1099 *
1100 * 1) in the window during which the setup is actually
1101 * already done, but not marked yet because not all
1102 * packets are spliced over to the driver pending
1103 * queue yet -- if this happened we acquire the lock
1104 * either before or after the splice happens, but
1105 * need to recheck which of these cases happened.
1106 *
1107 * 2) during session teardown, if the OPERATIONAL bit
1108 * was cleared due to the teardown but the pointer
1109 * hasn't been assigned NULL yet (or we loaded it
1110 * before it was assigned) -- in this case it may
1111 * now be NULL which means we should just let the
1112 * packet pass through because splicing the frames
1113 * back is already done.
1114 */
1115 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1116
1117 if (!tid_tx) {
1118 /* do nothing, let packet pass through */
1119 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1120 info->flags |= IEEE80211_TX_CTL_AMPDU;
1121 reset_agg_timer = true;
1122 } else {
1123 queued = true;
1124 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1125 clear_sta_flag(tx->sta, WLAN_STA_SP);
1126 ps_dbg(tx->sta->sdata,
1127 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1128 tx->sta->sta.addr, tx->sta->sta.aid);
1129 }
1130 info->control.vif = &tx->sdata->vif;
1131 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1132 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1133 __skb_queue_tail(&tid_tx->pending, skb);
1134 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1135 purge_skb = __skb_dequeue(&tid_tx->pending);
1136 }
1137 spin_unlock(&tx->sta->lock);
1138
1139 if (purge_skb)
1140 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1141 }
1142
1143 /* reset session timer */
1144 if (reset_agg_timer && tid_tx->timeout)
1145 tid_tx->last_tx = jiffies;
1146
1147 return queued;
1148 }
1149
1150 /*
1151 * initialises @tx
1152 * pass %NULL for the station if unknown, a valid pointer if known
1153 * or an ERR_PTR() if the station is known not to exist
1154 */
1155 static ieee80211_tx_result
1156 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1157 struct ieee80211_tx_data *tx,
1158 struct sta_info *sta, struct sk_buff *skb)
1159 {
1160 struct ieee80211_local *local = sdata->local;
1161 struct ieee80211_hdr *hdr;
1162 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1163 int tid;
1164 u8 *qc;
1165
1166 memset(tx, 0, sizeof(*tx));
1167 tx->skb = skb;
1168 tx->local = local;
1169 tx->sdata = sdata;
1170 __skb_queue_head_init(&tx->skbs);
1171
1172 /*
1173 * If this flag is set to true anywhere, and we get here,
1174 * we are doing the needed processing, so remove the flag
1175 * now.
1176 */
1177 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1178
1179 hdr = (struct ieee80211_hdr *) skb->data;
1180
1181 if (likely(sta)) {
1182 if (!IS_ERR(sta))
1183 tx->sta = sta;
1184 } else {
1185 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1186 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1187 if (!tx->sta && sdata->wdev.use_4addr)
1188 return TX_DROP;
1189 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1190 IEEE80211_TX_CTL_INJECTED) ||
1191 tx->sdata->control_port_protocol == tx->skb->protocol) {
1192 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1193 }
1194 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1195 tx->sta = sta_info_get(sdata, hdr->addr1);
1196 }
1197
1198 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1199 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1200 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1201 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1202 struct tid_ampdu_tx *tid_tx;
1203
1204 qc = ieee80211_get_qos_ctl(hdr);
1205 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1206
1207 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1208 if (tid_tx) {
1209 bool queued;
1210
1211 queued = ieee80211_tx_prep_agg(tx, skb, info,
1212 tid_tx, tid);
1213
1214 if (unlikely(queued))
1215 return TX_QUEUED;
1216 }
1217 }
1218
1219 if (is_multicast_ether_addr(hdr->addr1)) {
1220 tx->flags &= ~IEEE80211_TX_UNICAST;
1221 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1222 } else
1223 tx->flags |= IEEE80211_TX_UNICAST;
1224
1225 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1226 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1227 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1228 info->flags & IEEE80211_TX_CTL_AMPDU)
1229 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1230 }
1231
1232 if (!tx->sta)
1233 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1234 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1235 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1236 ieee80211_check_fast_xmit(tx->sta);
1237 }
1238
1239 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1240
1241 return TX_CONTINUE;
1242 }
1243
1244 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1245 struct ieee80211_vif *vif,
1246 struct sta_info *sta,
1247 struct sk_buff *skb)
1248 {
1249 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1250 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1251 struct ieee80211_txq *txq = NULL;
1252
1253 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1254 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1255 return NULL;
1256
1257 if (!ieee80211_is_data(hdr->frame_control))
1258 return NULL;
1259
1260 if (sta) {
1261 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1262
1263 if (!sta->uploaded)
1264 return NULL;
1265
1266 txq = sta->sta.txq[tid];
1267 } else if (vif) {
1268 txq = vif->txq;
1269 }
1270
1271 if (!txq)
1272 return NULL;
1273
1274 return to_txq_info(txq);
1275 }
1276
1277 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1278 {
1279 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1280 }
1281
1282 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi)
1283 {
1284 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif;
1285 }
1286
1287 static u32 codel_skb_len_func(const struct sk_buff *skb)
1288 {
1289 return skb->len;
1290 }
1291
1292 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1293 {
1294 const struct ieee80211_tx_info *info;
1295
1296 info = (const struct ieee80211_tx_info *)skb->cb;
1297 return info->control.enqueue_time;
1298 }
1299
1300 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1301 void *ctx)
1302 {
1303 struct ieee80211_local *local;
1304 struct txq_info *txqi;
1305 struct fq *fq;
1306 struct fq_flow *flow;
1307
1308 txqi = ctx;
1309 local = vif_to_sdata(txqi->txq.vif)->local;
1310 fq = &local->fq;
1311
1312 if (cvars == &txqi->def_cvars)
1313 flow = &txqi->def_flow;
1314 else
1315 flow = &fq->flows[cvars - local->cvars];
1316
1317 return fq_flow_dequeue(fq, flow);
1318 }
1319
1320 static void codel_drop_func(struct sk_buff *skb,
1321 void *ctx)
1322 {
1323 struct ieee80211_local *local;
1324 struct ieee80211_hw *hw;
1325 struct txq_info *txqi;
1326
1327 txqi = ctx;
1328 local = vif_to_sdata(txqi->txq.vif)->local;
1329 hw = &local->hw;
1330
1331 ieee80211_free_txskb(hw, skb);
1332 }
1333
1334 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1335 struct fq_tin *tin,
1336 struct fq_flow *flow)
1337 {
1338 struct ieee80211_local *local;
1339 struct txq_info *txqi;
1340 struct codel_vars *cvars;
1341 struct codel_params *cparams;
1342 struct codel_stats *cstats;
1343
1344 local = container_of(fq, struct ieee80211_local, fq);
1345 txqi = container_of(tin, struct txq_info, tin);
1346 cparams = &local->cparams;
1347 cstats = &txqi->cstats;
1348
1349 if (flow == &txqi->def_flow)
1350 cvars = &txqi->def_cvars;
1351 else
1352 cvars = &local->cvars[flow - fq->flows];
1353
1354 return codel_dequeue(txqi,
1355 &flow->backlog,
1356 cparams,
1357 cvars,
1358 cstats,
1359 codel_skb_len_func,
1360 codel_skb_time_func,
1361 codel_drop_func,
1362 codel_dequeue_func);
1363 }
1364
1365 static void fq_skb_free_func(struct fq *fq,
1366 struct fq_tin *tin,
1367 struct fq_flow *flow,
1368 struct sk_buff *skb)
1369 {
1370 struct ieee80211_local *local;
1371
1372 local = container_of(fq, struct ieee80211_local, fq);
1373 ieee80211_free_txskb(&local->hw, skb);
1374 }
1375
1376 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1377 struct fq_tin *tin,
1378 int idx,
1379 struct sk_buff *skb)
1380 {
1381 struct txq_info *txqi;
1382
1383 txqi = container_of(tin, struct txq_info, tin);
1384 return &txqi->def_flow;
1385 }
1386
1387 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1388 struct txq_info *txqi,
1389 struct sk_buff *skb)
1390 {
1391 struct fq *fq = &local->fq;
1392 struct fq_tin *tin = &txqi->tin;
1393
1394 ieee80211_set_skb_enqueue_time(skb);
1395 fq_tin_enqueue(fq, tin, skb,
1396 fq_skb_free_func,
1397 fq_flow_get_default_func);
1398 }
1399
1400 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1401 struct sta_info *sta,
1402 struct txq_info *txqi, int tid)
1403 {
1404 fq_tin_init(&txqi->tin);
1405 fq_flow_init(&txqi->def_flow);
1406 codel_vars_init(&txqi->def_cvars);
1407 codel_stats_init(&txqi->cstats);
1408 __skb_queue_head_init(&txqi->frags);
1409
1410 txqi->txq.vif = &sdata->vif;
1411
1412 if (sta) {
1413 txqi->txq.sta = &sta->sta;
1414 sta->sta.txq[tid] = &txqi->txq;
1415 txqi->txq.tid = tid;
1416 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
1417 } else {
1418 sdata->vif.txq = &txqi->txq;
1419 txqi->txq.tid = 0;
1420 txqi->txq.ac = IEEE80211_AC_BE;
1421 }
1422 }
1423
1424 void ieee80211_txq_purge(struct ieee80211_local *local,
1425 struct txq_info *txqi)
1426 {
1427 struct fq *fq = &local->fq;
1428 struct fq_tin *tin = &txqi->tin;
1429
1430 fq_tin_reset(fq, tin, fq_skb_free_func);
1431 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1432 }
1433
1434 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1435 {
1436 struct fq *fq = &local->fq;
1437 int ret;
1438 int i;
1439 bool supp_vht = false;
1440 enum nl80211_band band;
1441
1442 if (!local->ops->wake_tx_queue)
1443 return 0;
1444
1445 ret = fq_init(fq, 4096);
1446 if (ret)
1447 return ret;
1448
1449 /*
1450 * If the hardware doesn't support VHT, it is safe to limit the maximum
1451 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1452 */
1453 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1454 struct ieee80211_supported_band *sband;
1455
1456 sband = local->hw.wiphy->bands[band];
1457 if (!sband)
1458 continue;
1459
1460 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1461 }
1462
1463 if (!supp_vht)
1464 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1465
1466 codel_params_init(&local->cparams);
1467 local->cparams.interval = MS2TIME(100);
1468 local->cparams.target = MS2TIME(20);
1469 local->cparams.ecn = true;
1470
1471 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1472 GFP_KERNEL);
1473 if (!local->cvars) {
1474 spin_lock_bh(&fq->lock);
1475 fq_reset(fq, fq_skb_free_func);
1476 spin_unlock_bh(&fq->lock);
1477 return -ENOMEM;
1478 }
1479
1480 for (i = 0; i < fq->flows_cnt; i++)
1481 codel_vars_init(&local->cvars[i]);
1482
1483 return 0;
1484 }
1485
1486 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1487 {
1488 struct fq *fq = &local->fq;
1489
1490 if (!local->ops->wake_tx_queue)
1491 return;
1492
1493 kfree(local->cvars);
1494 local->cvars = NULL;
1495
1496 spin_lock_bh(&fq->lock);
1497 fq_reset(fq, fq_skb_free_func);
1498 spin_unlock_bh(&fq->lock);
1499 }
1500
1501 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1502 struct ieee80211_sub_if_data *sdata,
1503 struct sta_info *sta,
1504 struct sk_buff *skb)
1505 {
1506 struct fq *fq = &local->fq;
1507 struct ieee80211_vif *vif;
1508 struct txq_info *txqi;
1509
1510 if (!local->ops->wake_tx_queue ||
1511 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1512 return false;
1513
1514 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1515 sdata = container_of(sdata->bss,
1516 struct ieee80211_sub_if_data, u.ap);
1517
1518 vif = &sdata->vif;
1519 txqi = ieee80211_get_txq(local, vif, sta, skb);
1520
1521 if (!txqi)
1522 return false;
1523
1524 spin_lock_bh(&fq->lock);
1525 ieee80211_txq_enqueue(local, txqi, skb);
1526 spin_unlock_bh(&fq->lock);
1527
1528 drv_wake_tx_queue(local, txqi);
1529
1530 return true;
1531 }
1532
1533 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1534 struct ieee80211_vif *vif,
1535 struct ieee80211_sta *sta,
1536 struct sk_buff_head *skbs,
1537 bool txpending)
1538 {
1539 struct ieee80211_tx_control control = {};
1540 struct sk_buff *skb, *tmp;
1541 unsigned long flags;
1542
1543 skb_queue_walk_safe(skbs, skb, tmp) {
1544 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1545 int q = info->hw_queue;
1546
1547 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1548 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1549 __skb_unlink(skb, skbs);
1550 ieee80211_free_txskb(&local->hw, skb);
1551 continue;
1552 }
1553 #endif
1554
1555 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1556 if (local->queue_stop_reasons[q] ||
1557 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1558 if (unlikely(info->flags &
1559 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1560 if (local->queue_stop_reasons[q] &
1561 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1562 /*
1563 * Drop off-channel frames if queues
1564 * are stopped for any reason other
1565 * than off-channel operation. Never
1566 * queue them.
1567 */
1568 spin_unlock_irqrestore(
1569 &local->queue_stop_reason_lock,
1570 flags);
1571 ieee80211_purge_tx_queue(&local->hw,
1572 skbs);
1573 return true;
1574 }
1575 } else {
1576
1577 /*
1578 * Since queue is stopped, queue up frames for
1579 * later transmission from the tx-pending
1580 * tasklet when the queue is woken again.
1581 */
1582 if (txpending)
1583 skb_queue_splice_init(skbs,
1584 &local->pending[q]);
1585 else
1586 skb_queue_splice_tail_init(skbs,
1587 &local->pending[q]);
1588
1589 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1590 flags);
1591 return false;
1592 }
1593 }
1594 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1595
1596 info->control.vif = vif;
1597 control.sta = sta;
1598
1599 __skb_unlink(skb, skbs);
1600 drv_tx(local, &control, skb);
1601 }
1602
1603 return true;
1604 }
1605
1606 /*
1607 * Returns false if the frame couldn't be transmitted but was queued instead.
1608 */
1609 static bool __ieee80211_tx(struct ieee80211_local *local,
1610 struct sk_buff_head *skbs, int led_len,
1611 struct sta_info *sta, bool txpending)
1612 {
1613 struct ieee80211_tx_info *info;
1614 struct ieee80211_sub_if_data *sdata;
1615 struct ieee80211_vif *vif;
1616 struct ieee80211_sta *pubsta;
1617 struct sk_buff *skb;
1618 bool result = true;
1619 __le16 fc;
1620
1621 if (WARN_ON(skb_queue_empty(skbs)))
1622 return true;
1623
1624 skb = skb_peek(skbs);
1625 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1626 info = IEEE80211_SKB_CB(skb);
1627 sdata = vif_to_sdata(info->control.vif);
1628 if (sta && !sta->uploaded)
1629 sta = NULL;
1630
1631 if (sta)
1632 pubsta = &sta->sta;
1633 else
1634 pubsta = NULL;
1635
1636 switch (sdata->vif.type) {
1637 case NL80211_IFTYPE_MONITOR:
1638 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1639 vif = &sdata->vif;
1640 break;
1641 }
1642 sdata = rcu_dereference(local->monitor_sdata);
1643 if (sdata) {
1644 vif = &sdata->vif;
1645 info->hw_queue =
1646 vif->hw_queue[skb_get_queue_mapping(skb)];
1647 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1648 ieee80211_purge_tx_queue(&local->hw, skbs);
1649 return true;
1650 } else
1651 vif = NULL;
1652 break;
1653 case NL80211_IFTYPE_AP_VLAN:
1654 sdata = container_of(sdata->bss,
1655 struct ieee80211_sub_if_data, u.ap);
1656 /* fall through */
1657 default:
1658 vif = &sdata->vif;
1659 break;
1660 }
1661
1662 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1663 txpending);
1664
1665 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1666
1667 WARN_ON_ONCE(!skb_queue_empty(skbs));
1668
1669 return result;
1670 }
1671
1672 /*
1673 * Invoke TX handlers, return 0 on success and non-zero if the
1674 * frame was dropped or queued.
1675 *
1676 * The handlers are split into an early and late part. The latter is everything
1677 * that can be sensitive to reordering, and will be deferred to after packets
1678 * are dequeued from the intermediate queues (when they are enabled).
1679 */
1680 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1681 {
1682 ieee80211_tx_result res = TX_DROP;
1683
1684 #define CALL_TXH(txh) \
1685 do { \
1686 res = txh(tx); \
1687 if (res != TX_CONTINUE) \
1688 goto txh_done; \
1689 } while (0)
1690
1691 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1692 CALL_TXH(ieee80211_tx_h_check_assoc);
1693 CALL_TXH(ieee80211_tx_h_ps_buf);
1694 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1695 CALL_TXH(ieee80211_tx_h_select_key);
1696 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1697 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1698
1699 txh_done:
1700 if (unlikely(res == TX_DROP)) {
1701 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1702 if (tx->skb)
1703 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1704 else
1705 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1706 return -1;
1707 } else if (unlikely(res == TX_QUEUED)) {
1708 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1709 return -1;
1710 }
1711
1712 return 0;
1713 }
1714
1715 /*
1716 * Late handlers can be called while the sta lock is held. Handlers that can
1717 * cause packets to be generated will cause deadlock!
1718 */
1719 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1720 {
1721 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1722 ieee80211_tx_result res = TX_CONTINUE;
1723
1724 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1725 __skb_queue_tail(&tx->skbs, tx->skb);
1726 tx->skb = NULL;
1727 goto txh_done;
1728 }
1729
1730 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1731 CALL_TXH(ieee80211_tx_h_sequence);
1732 CALL_TXH(ieee80211_tx_h_fragment);
1733 /* handlers after fragment must be aware of tx info fragmentation! */
1734 CALL_TXH(ieee80211_tx_h_stats);
1735 CALL_TXH(ieee80211_tx_h_encrypt);
1736 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1737 CALL_TXH(ieee80211_tx_h_calculate_duration);
1738 #undef CALL_TXH
1739
1740 txh_done:
1741 if (unlikely(res == TX_DROP)) {
1742 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1743 if (tx->skb)
1744 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1745 else
1746 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1747 return -1;
1748 } else if (unlikely(res == TX_QUEUED)) {
1749 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1750 return -1;
1751 }
1752
1753 return 0;
1754 }
1755
1756 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1757 {
1758 int r = invoke_tx_handlers_early(tx);
1759
1760 if (r)
1761 return r;
1762 return invoke_tx_handlers_late(tx);
1763 }
1764
1765 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1766 struct ieee80211_vif *vif, struct sk_buff *skb,
1767 int band, struct ieee80211_sta **sta)
1768 {
1769 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1770 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1771 struct ieee80211_tx_data tx;
1772 struct sk_buff *skb2;
1773
1774 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1775 return false;
1776
1777 info->band = band;
1778 info->control.vif = vif;
1779 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1780
1781 if (invoke_tx_handlers(&tx))
1782 return false;
1783
1784 if (sta) {
1785 if (tx.sta)
1786 *sta = &tx.sta->sta;
1787 else
1788 *sta = NULL;
1789 }
1790
1791 /* this function isn't suitable for fragmented data frames */
1792 skb2 = __skb_dequeue(&tx.skbs);
1793 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1794 ieee80211_free_txskb(hw, skb2);
1795 ieee80211_purge_tx_queue(hw, &tx.skbs);
1796 return false;
1797 }
1798
1799 return true;
1800 }
1801 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1802
1803 /*
1804 * Returns false if the frame couldn't be transmitted but was queued instead.
1805 */
1806 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1807 struct sta_info *sta, struct sk_buff *skb,
1808 bool txpending)
1809 {
1810 struct ieee80211_local *local = sdata->local;
1811 struct ieee80211_tx_data tx;
1812 ieee80211_tx_result res_prepare;
1813 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1814 bool result = true;
1815 int led_len;
1816
1817 if (unlikely(skb->len < 10)) {
1818 dev_kfree_skb(skb);
1819 return true;
1820 }
1821
1822 /* initialises tx */
1823 led_len = skb->len;
1824 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1825
1826 if (unlikely(res_prepare == TX_DROP)) {
1827 ieee80211_free_txskb(&local->hw, skb);
1828 return true;
1829 } else if (unlikely(res_prepare == TX_QUEUED)) {
1830 return true;
1831 }
1832
1833 /* set up hw_queue value early */
1834 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1835 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1836 info->hw_queue =
1837 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1838
1839 if (invoke_tx_handlers_early(&tx))
1840 return false;
1841
1842 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1843 return true;
1844
1845 if (!invoke_tx_handlers_late(&tx))
1846 result = __ieee80211_tx(local, &tx.skbs, led_len,
1847 tx.sta, txpending);
1848
1849 return result;
1850 }
1851
1852 /* device xmit handlers */
1853
1854 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1855 struct sk_buff *skb,
1856 int head_need, bool may_encrypt)
1857 {
1858 struct ieee80211_local *local = sdata->local;
1859 int tail_need = 0;
1860
1861 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1862 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1863 tail_need -= skb_tailroom(skb);
1864 tail_need = max_t(int, tail_need, 0);
1865 }
1866
1867 if (skb_cloned(skb) &&
1868 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1869 !skb_clone_writable(skb, ETH_HLEN) ||
1870 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1871 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1872 else if (head_need || tail_need)
1873 I802_DEBUG_INC(local->tx_expand_skb_head);
1874 else
1875 return 0;
1876
1877 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1878 wiphy_debug(local->hw.wiphy,
1879 "failed to reallocate TX buffer\n");
1880 return -ENOMEM;
1881 }
1882
1883 return 0;
1884 }
1885
1886 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1887 struct sta_info *sta, struct sk_buff *skb)
1888 {
1889 struct ieee80211_local *local = sdata->local;
1890 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1891 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1892 int headroom;
1893 bool may_encrypt;
1894
1895 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1896
1897 headroom = local->tx_headroom;
1898 if (may_encrypt)
1899 headroom += sdata->encrypt_headroom;
1900 headroom -= skb_headroom(skb);
1901 headroom = max_t(int, 0, headroom);
1902
1903 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1904 ieee80211_free_txskb(&local->hw, skb);
1905 return;
1906 }
1907
1908 hdr = (struct ieee80211_hdr *) skb->data;
1909 info->control.vif = &sdata->vif;
1910
1911 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1912 if (ieee80211_is_data(hdr->frame_control) &&
1913 is_unicast_ether_addr(hdr->addr1)) {
1914 if (mesh_nexthop_resolve(sdata, skb))
1915 return; /* skb queued: don't free */
1916 } else {
1917 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1918 }
1919 }
1920
1921 ieee80211_set_qos_hdr(sdata, skb);
1922 ieee80211_tx(sdata, sta, skb, false);
1923 }
1924
1925 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1926 struct sk_buff *skb)
1927 {
1928 struct ieee80211_radiotap_iterator iterator;
1929 struct ieee80211_radiotap_header *rthdr =
1930 (struct ieee80211_radiotap_header *) skb->data;
1931 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1932 struct ieee80211_supported_band *sband =
1933 local->hw.wiphy->bands[info->band];
1934 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1935 NULL);
1936 u16 txflags;
1937 u16 rate = 0;
1938 bool rate_found = false;
1939 u8 rate_retries = 0;
1940 u16 rate_flags = 0;
1941 u8 mcs_known, mcs_flags, mcs_bw;
1942 u16 vht_known;
1943 u8 vht_mcs = 0, vht_nss = 0;
1944 int i;
1945
1946 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1947 IEEE80211_TX_CTL_DONTFRAG;
1948
1949 /*
1950 * for every radiotap entry that is present
1951 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1952 * entries present, or -EINVAL on error)
1953 */
1954
1955 while (!ret) {
1956 ret = ieee80211_radiotap_iterator_next(&iterator);
1957
1958 if (ret)
1959 continue;
1960
1961 /* see if this argument is something we can use */
1962 switch (iterator.this_arg_index) {
1963 /*
1964 * You must take care when dereferencing iterator.this_arg
1965 * for multibyte types... the pointer is not aligned. Use
1966 * get_unaligned((type *)iterator.this_arg) to dereference
1967 * iterator.this_arg for type "type" safely on all arches.
1968 */
1969 case IEEE80211_RADIOTAP_FLAGS:
1970 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1971 /*
1972 * this indicates that the skb we have been
1973 * handed has the 32-bit FCS CRC at the end...
1974 * we should react to that by snipping it off
1975 * because it will be recomputed and added
1976 * on transmission
1977 */
1978 if (skb->len < (iterator._max_length + FCS_LEN))
1979 return false;
1980
1981 skb_trim(skb, skb->len - FCS_LEN);
1982 }
1983 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1984 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1985 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1986 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1987 break;
1988
1989 case IEEE80211_RADIOTAP_TX_FLAGS:
1990 txflags = get_unaligned_le16(iterator.this_arg);
1991 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1992 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1993 break;
1994
1995 case IEEE80211_RADIOTAP_RATE:
1996 rate = *iterator.this_arg;
1997 rate_flags = 0;
1998 rate_found = true;
1999 break;
2000
2001 case IEEE80211_RADIOTAP_DATA_RETRIES:
2002 rate_retries = *iterator.this_arg;
2003 break;
2004
2005 case IEEE80211_RADIOTAP_MCS:
2006 mcs_known = iterator.this_arg[0];
2007 mcs_flags = iterator.this_arg[1];
2008 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2009 break;
2010
2011 rate_found = true;
2012 rate = iterator.this_arg[2];
2013 rate_flags = IEEE80211_TX_RC_MCS;
2014
2015 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2016 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2017 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2018
2019 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2020 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2021 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2022 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2023 break;
2024
2025 case IEEE80211_RADIOTAP_VHT:
2026 vht_known = get_unaligned_le16(iterator.this_arg);
2027 rate_found = true;
2028
2029 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2030 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2031 (iterator.this_arg[2] &
2032 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2033 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2034 if (vht_known &
2035 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2036 if (iterator.this_arg[3] == 1)
2037 rate_flags |=
2038 IEEE80211_TX_RC_40_MHZ_WIDTH;
2039 else if (iterator.this_arg[3] == 4)
2040 rate_flags |=
2041 IEEE80211_TX_RC_80_MHZ_WIDTH;
2042 else if (iterator.this_arg[3] == 11)
2043 rate_flags |=
2044 IEEE80211_TX_RC_160_MHZ_WIDTH;
2045 }
2046
2047 vht_mcs = iterator.this_arg[4] >> 4;
2048 vht_nss = iterator.this_arg[4] & 0xF;
2049 break;
2050
2051 /*
2052 * Please update the file
2053 * Documentation/networking/mac80211-injection.txt
2054 * when parsing new fields here.
2055 */
2056
2057 default:
2058 break;
2059 }
2060 }
2061
2062 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2063 return false;
2064
2065 if (rate_found) {
2066 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2067
2068 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2069 info->control.rates[i].idx = -1;
2070 info->control.rates[i].flags = 0;
2071 info->control.rates[i].count = 0;
2072 }
2073
2074 if (rate_flags & IEEE80211_TX_RC_MCS) {
2075 info->control.rates[0].idx = rate;
2076 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2077 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2078 vht_nss);
2079 } else {
2080 for (i = 0; i < sband->n_bitrates; i++) {
2081 if (rate * 5 != sband->bitrates[i].bitrate)
2082 continue;
2083
2084 info->control.rates[0].idx = i;
2085 break;
2086 }
2087 }
2088
2089 if (info->control.rates[0].idx < 0)
2090 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2091
2092 info->control.rates[0].flags = rate_flags;
2093 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2094 local->hw.max_rate_tries);
2095 }
2096
2097 /*
2098 * remove the radiotap header
2099 * iterator->_max_length was sanity-checked against
2100 * skb->len by iterator init
2101 */
2102 skb_pull(skb, iterator._max_length);
2103
2104 return true;
2105 }
2106
2107 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2108 struct net_device *dev)
2109 {
2110 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2111 struct ieee80211_chanctx_conf *chanctx_conf;
2112 struct ieee80211_radiotap_header *prthdr =
2113 (struct ieee80211_radiotap_header *)skb->data;
2114 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2115 struct ieee80211_hdr *hdr;
2116 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2117 struct cfg80211_chan_def *chandef;
2118 u16 len_rthdr;
2119 int hdrlen;
2120
2121 /* check for not even having the fixed radiotap header part */
2122 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2123 goto fail; /* too short to be possibly valid */
2124
2125 /* is it a header version we can trust to find length from? */
2126 if (unlikely(prthdr->it_version))
2127 goto fail; /* only version 0 is supported */
2128
2129 /* then there must be a radiotap header with a length we can use */
2130 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2131
2132 /* does the skb contain enough to deliver on the alleged length? */
2133 if (unlikely(skb->len < len_rthdr))
2134 goto fail; /* skb too short for claimed rt header extent */
2135
2136 /*
2137 * fix up the pointers accounting for the radiotap
2138 * header still being in there. We are being given
2139 * a precooked IEEE80211 header so no need for
2140 * normal processing
2141 */
2142 skb_set_mac_header(skb, len_rthdr);
2143 /*
2144 * these are just fixed to the end of the rt area since we
2145 * don't have any better information and at this point, nobody cares
2146 */
2147 skb_set_network_header(skb, len_rthdr);
2148 skb_set_transport_header(skb, len_rthdr);
2149
2150 if (skb->len < len_rthdr + 2)
2151 goto fail;
2152
2153 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2154 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2155
2156 if (skb->len < len_rthdr + hdrlen)
2157 goto fail;
2158
2159 /*
2160 * Initialize skb->protocol if the injected frame is a data frame
2161 * carrying a rfc1042 header
2162 */
2163 if (ieee80211_is_data(hdr->frame_control) &&
2164 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2165 u8 *payload = (u8 *)hdr + hdrlen;
2166
2167 if (ether_addr_equal(payload, rfc1042_header))
2168 skb->protocol = cpu_to_be16((payload[6] << 8) |
2169 payload[7]);
2170 }
2171
2172 memset(info, 0, sizeof(*info));
2173
2174 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2175 IEEE80211_TX_CTL_INJECTED;
2176
2177 rcu_read_lock();
2178
2179 /*
2180 * We process outgoing injected frames that have a local address
2181 * we handle as though they are non-injected frames.
2182 * This code here isn't entirely correct, the local MAC address
2183 * isn't always enough to find the interface to use; for proper
2184 * VLAN/WDS support we will need a different mechanism (which
2185 * likely isn't going to be monitor interfaces).
2186 */
2187 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2188
2189 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2190 if (!ieee80211_sdata_running(tmp_sdata))
2191 continue;
2192 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2193 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2194 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2195 continue;
2196 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2197 sdata = tmp_sdata;
2198 break;
2199 }
2200 }
2201
2202 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2203 if (!chanctx_conf) {
2204 tmp_sdata = rcu_dereference(local->monitor_sdata);
2205 if (tmp_sdata)
2206 chanctx_conf =
2207 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2208 }
2209
2210 if (chanctx_conf)
2211 chandef = &chanctx_conf->def;
2212 else if (!local->use_chanctx)
2213 chandef = &local->_oper_chandef;
2214 else
2215 goto fail_rcu;
2216
2217 /*
2218 * Frame injection is not allowed if beaconing is not allowed
2219 * or if we need radar detection. Beaconing is usually not allowed when
2220 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2221 * Passive scan is also used in world regulatory domains where
2222 * your country is not known and as such it should be treated as
2223 * NO TX unless the channel is explicitly allowed in which case
2224 * your current regulatory domain would not have the passive scan
2225 * flag.
2226 *
2227 * Since AP mode uses monitor interfaces to inject/TX management
2228 * frames we can make AP mode the exception to this rule once it
2229 * supports radar detection as its implementation can deal with
2230 * radar detection by itself. We can do that later by adding a
2231 * monitor flag interfaces used for AP support.
2232 */
2233 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2234 sdata->vif.type))
2235 goto fail_rcu;
2236
2237 info->band = chandef->chan->band;
2238
2239 /* process and remove the injection radiotap header */
2240 if (!ieee80211_parse_tx_radiotap(local, skb))
2241 goto fail_rcu;
2242
2243 ieee80211_xmit(sdata, NULL, skb);
2244 rcu_read_unlock();
2245
2246 return NETDEV_TX_OK;
2247
2248 fail_rcu:
2249 rcu_read_unlock();
2250 fail:
2251 dev_kfree_skb(skb);
2252 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2253 }
2254
2255 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2256 {
2257 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2258
2259 return ethertype == ETH_P_TDLS &&
2260 skb->len > 14 &&
2261 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2262 }
2263
2264 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2265 struct sk_buff *skb,
2266 struct sta_info **sta_out)
2267 {
2268 struct sta_info *sta;
2269
2270 switch (sdata->vif.type) {
2271 case NL80211_IFTYPE_AP_VLAN:
2272 sta = rcu_dereference(sdata->u.vlan.sta);
2273 if (sta) {
2274 *sta_out = sta;
2275 return 0;
2276 } else if (sdata->wdev.use_4addr) {
2277 return -ENOLINK;
2278 }
2279 /* fall through */
2280 case NL80211_IFTYPE_AP:
2281 case NL80211_IFTYPE_OCB:
2282 case NL80211_IFTYPE_ADHOC:
2283 if (is_multicast_ether_addr(skb->data)) {
2284 *sta_out = ERR_PTR(-ENOENT);
2285 return 0;
2286 }
2287 sta = sta_info_get_bss(sdata, skb->data);
2288 break;
2289 case NL80211_IFTYPE_WDS:
2290 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2291 break;
2292 #ifdef CONFIG_MAC80211_MESH
2293 case NL80211_IFTYPE_MESH_POINT:
2294 /* determined much later */
2295 *sta_out = NULL;
2296 return 0;
2297 #endif
2298 case NL80211_IFTYPE_STATION:
2299 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2300 sta = sta_info_get(sdata, skb->data);
2301 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2302 if (test_sta_flag(sta,
2303 WLAN_STA_TDLS_PEER_AUTH)) {
2304 *sta_out = sta;
2305 return 0;
2306 }
2307
2308 /*
2309 * TDLS link during setup - throw out frames to
2310 * peer. Allow TDLS-setup frames to unauthorized
2311 * peers for the special case of a link teardown
2312 * after a TDLS sta is removed due to being
2313 * unreachable.
2314 */
2315 if (!ieee80211_is_tdls_setup(skb))
2316 return -EINVAL;
2317 }
2318
2319 }
2320
2321 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2322 if (!sta)
2323 return -ENOLINK;
2324 break;
2325 default:
2326 return -EINVAL;
2327 }
2328
2329 *sta_out = sta ?: ERR_PTR(-ENOENT);
2330 return 0;
2331 }
2332
2333 /**
2334 * ieee80211_build_hdr - build 802.11 header in the given frame
2335 * @sdata: virtual interface to build the header for
2336 * @skb: the skb to build the header in
2337 * @info_flags: skb flags to set
2338 *
2339 * This function takes the skb with 802.3 header and reformats the header to
2340 * the appropriate IEEE 802.11 header based on which interface the packet is
2341 * being transmitted on.
2342 *
2343 * Note that this function also takes care of the TX status request and
2344 * potential unsharing of the SKB - this needs to be interleaved with the
2345 * header building.
2346 *
2347 * The function requires the read-side RCU lock held
2348 *
2349 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2350 */
2351 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2352 struct sk_buff *skb, u32 info_flags,
2353 struct sta_info *sta)
2354 {
2355 struct ieee80211_local *local = sdata->local;
2356 struct ieee80211_tx_info *info;
2357 int head_need;
2358 u16 ethertype, hdrlen, meshhdrlen = 0;
2359 __le16 fc;
2360 struct ieee80211_hdr hdr;
2361 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2362 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2363 const u8 *encaps_data;
2364 int encaps_len, skip_header_bytes;
2365 bool wme_sta = false, authorized = false;
2366 bool tdls_peer;
2367 bool multicast;
2368 u16 info_id = 0;
2369 struct ieee80211_chanctx_conf *chanctx_conf;
2370 struct ieee80211_sub_if_data *ap_sdata;
2371 enum nl80211_band band;
2372 int ret;
2373
2374 if (IS_ERR(sta))
2375 sta = NULL;
2376
2377 /* convert Ethernet header to proper 802.11 header (based on
2378 * operation mode) */
2379 ethertype = (skb->data[12] << 8) | skb->data[13];
2380 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2381
2382 switch (sdata->vif.type) {
2383 case NL80211_IFTYPE_AP_VLAN:
2384 if (sdata->wdev.use_4addr) {
2385 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2386 /* RA TA DA SA */
2387 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2388 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2389 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2390 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2391 hdrlen = 30;
2392 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2393 wme_sta = sta->sta.wme;
2394 }
2395 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2396 u.ap);
2397 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2398 if (!chanctx_conf) {
2399 ret = -ENOTCONN;
2400 goto free;
2401 }
2402 band = chanctx_conf->def.chan->band;
2403 if (sdata->wdev.use_4addr)
2404 break;
2405 /* fall through */
2406 case NL80211_IFTYPE_AP:
2407 if (sdata->vif.type == NL80211_IFTYPE_AP)
2408 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2409 if (!chanctx_conf) {
2410 ret = -ENOTCONN;
2411 goto free;
2412 }
2413 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2414 /* DA BSSID SA */
2415 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2416 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2417 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2418 hdrlen = 24;
2419 band = chanctx_conf->def.chan->band;
2420 break;
2421 case NL80211_IFTYPE_WDS:
2422 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2423 /* RA TA DA SA */
2424 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2425 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2426 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2427 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2428 hdrlen = 30;
2429 /*
2430 * This is the exception! WDS style interfaces are prohibited
2431 * when channel contexts are in used so this must be valid
2432 */
2433 band = local->hw.conf.chandef.chan->band;
2434 break;
2435 #ifdef CONFIG_MAC80211_MESH
2436 case NL80211_IFTYPE_MESH_POINT:
2437 if (!is_multicast_ether_addr(skb->data)) {
2438 struct sta_info *next_hop;
2439 bool mpp_lookup = true;
2440
2441 mpath = mesh_path_lookup(sdata, skb->data);
2442 if (mpath) {
2443 mpp_lookup = false;
2444 next_hop = rcu_dereference(mpath->next_hop);
2445 if (!next_hop ||
2446 !(mpath->flags & (MESH_PATH_ACTIVE |
2447 MESH_PATH_RESOLVING)))
2448 mpp_lookup = true;
2449 }
2450
2451 if (mpp_lookup) {
2452 mppath = mpp_path_lookup(sdata, skb->data);
2453 if (mppath)
2454 mppath->exp_time = jiffies;
2455 }
2456
2457 if (mppath && mpath)
2458 mesh_path_del(sdata, mpath->dst);
2459 }
2460
2461 /*
2462 * Use address extension if it is a packet from
2463 * another interface or if we know the destination
2464 * is being proxied by a portal (i.e. portal address
2465 * differs from proxied address)
2466 */
2467 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2468 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2469 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2470 skb->data, skb->data + ETH_ALEN);
2471 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2472 NULL, NULL);
2473 } else {
2474 /* DS -> MBSS (802.11-2012 13.11.3.3).
2475 * For unicast with unknown forwarding information,
2476 * destination might be in the MBSS or if that fails
2477 * forwarded to another mesh gate. In either case
2478 * resolution will be handled in ieee80211_xmit(), so
2479 * leave the original DA. This also works for mcast */
2480 const u8 *mesh_da = skb->data;
2481
2482 if (mppath)
2483 mesh_da = mppath->mpp;
2484 else if (mpath)
2485 mesh_da = mpath->dst;
2486
2487 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2488 mesh_da, sdata->vif.addr);
2489 if (is_multicast_ether_addr(mesh_da))
2490 /* DA TA mSA AE:SA */
2491 meshhdrlen = ieee80211_new_mesh_header(
2492 sdata, &mesh_hdr,
2493 skb->data + ETH_ALEN, NULL);
2494 else
2495 /* RA TA mDA mSA AE:DA SA */
2496 meshhdrlen = ieee80211_new_mesh_header(
2497 sdata, &mesh_hdr, skb->data,
2498 skb->data + ETH_ALEN);
2499
2500 }
2501 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2502 if (!chanctx_conf) {
2503 ret = -ENOTCONN;
2504 goto free;
2505 }
2506 band = chanctx_conf->def.chan->band;
2507 break;
2508 #endif
2509 case NL80211_IFTYPE_STATION:
2510 /* we already did checks when looking up the RA STA */
2511 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2512
2513 if (tdls_peer) {
2514 /* DA SA BSSID */
2515 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2516 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2517 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2518 hdrlen = 24;
2519 } else if (sdata->u.mgd.use_4addr &&
2520 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2521 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2522 IEEE80211_FCTL_TODS);
2523 /* RA TA DA SA */
2524 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2525 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2526 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2527 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2528 hdrlen = 30;
2529 } else {
2530 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2531 /* BSSID SA DA */
2532 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2533 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2534 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2535 hdrlen = 24;
2536 }
2537 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2538 if (!chanctx_conf) {
2539 ret = -ENOTCONN;
2540 goto free;
2541 }
2542 band = chanctx_conf->def.chan->band;
2543 break;
2544 case NL80211_IFTYPE_OCB:
2545 /* DA SA BSSID */
2546 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2547 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2548 eth_broadcast_addr(hdr.addr3);
2549 hdrlen = 24;
2550 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2551 if (!chanctx_conf) {
2552 ret = -ENOTCONN;
2553 goto free;
2554 }
2555 band = chanctx_conf->def.chan->band;
2556 break;
2557 case NL80211_IFTYPE_ADHOC:
2558 /* DA SA BSSID */
2559 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2560 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2561 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2562 hdrlen = 24;
2563 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2564 if (!chanctx_conf) {
2565 ret = -ENOTCONN;
2566 goto free;
2567 }
2568 band = chanctx_conf->def.chan->band;
2569 break;
2570 default:
2571 ret = -EINVAL;
2572 goto free;
2573 }
2574
2575 multicast = is_multicast_ether_addr(hdr.addr1);
2576
2577 /* sta is always NULL for mesh */
2578 if (sta) {
2579 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2580 wme_sta = sta->sta.wme;
2581 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2582 /* For mesh, the use of the QoS header is mandatory */
2583 wme_sta = true;
2584 }
2585
2586 /* receiver does QoS (which also means we do) use it */
2587 if (wme_sta) {
2588 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2589 hdrlen += 2;
2590 }
2591
2592 /*
2593 * Drop unicast frames to unauthorised stations unless they are
2594 * EAPOL frames from the local station.
2595 */
2596 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2597 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2598 !multicast && !authorized &&
2599 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2600 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2601 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2602 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2603 sdata->name, hdr.addr1);
2604 #endif
2605
2606 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2607
2608 ret = -EPERM;
2609 goto free;
2610 }
2611
2612 if (unlikely(!multicast && skb->sk &&
2613 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2614 struct sk_buff *ack_skb = skb_clone_sk(skb);
2615
2616 if (ack_skb) {
2617 unsigned long flags;
2618 int id;
2619
2620 spin_lock_irqsave(&local->ack_status_lock, flags);
2621 id = idr_alloc(&local->ack_status_frames, ack_skb,
2622 1, 0x10000, GFP_ATOMIC);
2623 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2624
2625 if (id >= 0) {
2626 info_id = id;
2627 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2628 } else {
2629 kfree_skb(ack_skb);
2630 }
2631 }
2632 }
2633
2634 /*
2635 * If the skb is shared we need to obtain our own copy.
2636 */
2637 if (skb_shared(skb)) {
2638 struct sk_buff *tmp_skb = skb;
2639
2640 /* can't happen -- skb is a clone if info_id != 0 */
2641 WARN_ON(info_id);
2642
2643 skb = skb_clone(skb, GFP_ATOMIC);
2644 kfree_skb(tmp_skb);
2645
2646 if (!skb) {
2647 ret = -ENOMEM;
2648 goto free;
2649 }
2650 }
2651
2652 hdr.frame_control = fc;
2653 hdr.duration_id = 0;
2654 hdr.seq_ctrl = 0;
2655
2656 skip_header_bytes = ETH_HLEN;
2657 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2658 encaps_data = bridge_tunnel_header;
2659 encaps_len = sizeof(bridge_tunnel_header);
2660 skip_header_bytes -= 2;
2661 } else if (ethertype >= ETH_P_802_3_MIN) {
2662 encaps_data = rfc1042_header;
2663 encaps_len = sizeof(rfc1042_header);
2664 skip_header_bytes -= 2;
2665 } else {
2666 encaps_data = NULL;
2667 encaps_len = 0;
2668 }
2669
2670 skb_pull(skb, skip_header_bytes);
2671 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2672
2673 /*
2674 * So we need to modify the skb header and hence need a copy of
2675 * that. The head_need variable above doesn't, so far, include
2676 * the needed header space that we don't need right away. If we
2677 * can, then we don't reallocate right now but only after the
2678 * frame arrives at the master device (if it does...)
2679 *
2680 * If we cannot, however, then we will reallocate to include all
2681 * the ever needed space. Also, if we need to reallocate it anyway,
2682 * make it big enough for everything we may ever need.
2683 */
2684
2685 if (head_need > 0 || skb_cloned(skb)) {
2686 head_need += sdata->encrypt_headroom;
2687 head_need += local->tx_headroom;
2688 head_need = max_t(int, 0, head_need);
2689 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2690 ieee80211_free_txskb(&local->hw, skb);
2691 skb = NULL;
2692 return ERR_PTR(-ENOMEM);
2693 }
2694 }
2695
2696 if (encaps_data)
2697 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2698
2699 #ifdef CONFIG_MAC80211_MESH
2700 if (meshhdrlen > 0)
2701 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2702 #endif
2703
2704 if (ieee80211_is_data_qos(fc)) {
2705 __le16 *qos_control;
2706
2707 qos_control = (__le16 *) skb_push(skb, 2);
2708 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2709 /*
2710 * Maybe we could actually set some fields here, for now just
2711 * initialise to zero to indicate no special operation.
2712 */
2713 *qos_control = 0;
2714 } else
2715 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2716
2717 skb_reset_mac_header(skb);
2718
2719 info = IEEE80211_SKB_CB(skb);
2720 memset(info, 0, sizeof(*info));
2721
2722 info->flags = info_flags;
2723 info->ack_frame_id = info_id;
2724 info->band = band;
2725
2726 return skb;
2727 free:
2728 kfree_skb(skb);
2729 return ERR_PTR(ret);
2730 }
2731
2732 /*
2733 * fast-xmit overview
2734 *
2735 * The core idea of this fast-xmit is to remove per-packet checks by checking
2736 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2737 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2738 * much less work can be done per packet. For example, fragmentation must be
2739 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2740 * in the code here.
2741 *
2742 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2743 * header and other data to aid packet processing in ieee80211_xmit_fast().
2744 *
2745 * The most difficult part of this is that when any of these assumptions
2746 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2747 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2748 * since the per-packet code no longer checks the conditions. This is reflected
2749 * by the calls to these functions throughout the rest of the code, and must be
2750 * maintained if any of the TX path checks change.
2751 */
2752
2753 void ieee80211_check_fast_xmit(struct sta_info *sta)
2754 {
2755 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2756 struct ieee80211_local *local = sta->local;
2757 struct ieee80211_sub_if_data *sdata = sta->sdata;
2758 struct ieee80211_hdr *hdr = (void *)build.hdr;
2759 struct ieee80211_chanctx_conf *chanctx_conf;
2760 __le16 fc;
2761
2762 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2763 return;
2764
2765 /* Locking here protects both the pointer itself, and against concurrent
2766 * invocations winning data access races to, e.g., the key pointer that
2767 * is used.
2768 * Without it, the invocation of this function right after the key
2769 * pointer changes wouldn't be sufficient, as another CPU could access
2770 * the pointer, then stall, and then do the cache update after the CPU
2771 * that invalidated the key.
2772 * With the locking, such scenarios cannot happen as the check for the
2773 * key and the fast-tx assignment are done atomically, so the CPU that
2774 * modifies the key will either wait or other one will see the key
2775 * cleared/changed already.
2776 */
2777 spin_lock_bh(&sta->lock);
2778 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2779 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2780 sdata->vif.type == NL80211_IFTYPE_STATION)
2781 goto out;
2782
2783 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2784 goto out;
2785
2786 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2787 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2788 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2789 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2790 goto out;
2791
2792 if (sdata->noack_map)
2793 goto out;
2794
2795 /* fast-xmit doesn't handle fragmentation at all */
2796 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2797 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2798 goto out;
2799
2800 rcu_read_lock();
2801 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2802 if (!chanctx_conf) {
2803 rcu_read_unlock();
2804 goto out;
2805 }
2806 build.band = chanctx_conf->def.chan->band;
2807 rcu_read_unlock();
2808
2809 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2810
2811 switch (sdata->vif.type) {
2812 case NL80211_IFTYPE_ADHOC:
2813 /* DA SA BSSID */
2814 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2815 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2816 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2817 build.hdr_len = 24;
2818 break;
2819 case NL80211_IFTYPE_STATION:
2820 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2821 /* DA SA BSSID */
2822 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2823 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2824 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2825 build.hdr_len = 24;
2826 break;
2827 }
2828
2829 if (sdata->u.mgd.use_4addr) {
2830 /* non-regular ethertype cannot use the fastpath */
2831 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2832 IEEE80211_FCTL_TODS);
2833 /* RA TA DA SA */
2834 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2835 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2836 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2837 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2838 build.hdr_len = 30;
2839 break;
2840 }
2841 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2842 /* BSSID SA DA */
2843 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2844 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2845 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2846 build.hdr_len = 24;
2847 break;
2848 case NL80211_IFTYPE_AP_VLAN:
2849 if (sdata->wdev.use_4addr) {
2850 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2851 IEEE80211_FCTL_TODS);
2852 /* RA TA DA SA */
2853 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2854 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2855 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2856 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2857 build.hdr_len = 30;
2858 break;
2859 }
2860 /* fall through */
2861 case NL80211_IFTYPE_AP:
2862 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2863 /* DA BSSID SA */
2864 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2865 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2866 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2867 build.hdr_len = 24;
2868 break;
2869 default:
2870 /* not handled on fast-xmit */
2871 goto out;
2872 }
2873
2874 if (sta->sta.wme) {
2875 build.hdr_len += 2;
2876 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2877 }
2878
2879 /* We store the key here so there's no point in using rcu_dereference()
2880 * but that's fine because the code that changes the pointers will call
2881 * this function after doing so. For a single CPU that would be enough,
2882 * for multiple see the comment above.
2883 */
2884 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2885 if (!build.key)
2886 build.key = rcu_access_pointer(sdata->default_unicast_key);
2887 if (build.key) {
2888 bool gen_iv, iv_spc, mmic;
2889
2890 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2891 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2892 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2893
2894 /* don't handle software crypto */
2895 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2896 goto out;
2897
2898 switch (build.key->conf.cipher) {
2899 case WLAN_CIPHER_SUITE_CCMP:
2900 case WLAN_CIPHER_SUITE_CCMP_256:
2901 /* add fixed key ID */
2902 if (gen_iv) {
2903 (build.hdr + build.hdr_len)[3] =
2904 0x20 | (build.key->conf.keyidx << 6);
2905 build.pn_offs = build.hdr_len;
2906 }
2907 if (gen_iv || iv_spc)
2908 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2909 break;
2910 case WLAN_CIPHER_SUITE_GCMP:
2911 case WLAN_CIPHER_SUITE_GCMP_256:
2912 /* add fixed key ID */
2913 if (gen_iv) {
2914 (build.hdr + build.hdr_len)[3] =
2915 0x20 | (build.key->conf.keyidx << 6);
2916 build.pn_offs = build.hdr_len;
2917 }
2918 if (gen_iv || iv_spc)
2919 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2920 break;
2921 case WLAN_CIPHER_SUITE_TKIP:
2922 /* cannot handle MMIC or IV generation in xmit-fast */
2923 if (mmic || gen_iv)
2924 goto out;
2925 if (iv_spc)
2926 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2927 break;
2928 case WLAN_CIPHER_SUITE_WEP40:
2929 case WLAN_CIPHER_SUITE_WEP104:
2930 /* cannot handle IV generation in fast-xmit */
2931 if (gen_iv)
2932 goto out;
2933 if (iv_spc)
2934 build.hdr_len += IEEE80211_WEP_IV_LEN;
2935 break;
2936 case WLAN_CIPHER_SUITE_AES_CMAC:
2937 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2938 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2939 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2940 WARN(1,
2941 "management cipher suite 0x%x enabled for data\n",
2942 build.key->conf.cipher);
2943 goto out;
2944 default:
2945 /* we don't know how to generate IVs for this at all */
2946 if (WARN_ON(gen_iv))
2947 goto out;
2948 /* pure hardware keys are OK, of course */
2949 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2950 break;
2951 /* cipher scheme might require space allocation */
2952 if (iv_spc &&
2953 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2954 goto out;
2955 if (iv_spc)
2956 build.hdr_len += build.key->conf.iv_len;
2957 }
2958
2959 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2960 }
2961
2962 hdr->frame_control = fc;
2963
2964 memcpy(build.hdr + build.hdr_len,
2965 rfc1042_header, sizeof(rfc1042_header));
2966 build.hdr_len += sizeof(rfc1042_header);
2967
2968 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2969 /* if the kmemdup fails, continue w/o fast_tx */
2970 if (!fast_tx)
2971 goto out;
2972
2973 out:
2974 /* we might have raced against another call to this function */
2975 old = rcu_dereference_protected(sta->fast_tx,
2976 lockdep_is_held(&sta->lock));
2977 rcu_assign_pointer(sta->fast_tx, fast_tx);
2978 if (old)
2979 kfree_rcu(old, rcu_head);
2980 spin_unlock_bh(&sta->lock);
2981 }
2982
2983 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2984 {
2985 struct sta_info *sta;
2986
2987 rcu_read_lock();
2988 list_for_each_entry_rcu(sta, &local->sta_list, list)
2989 ieee80211_check_fast_xmit(sta);
2990 rcu_read_unlock();
2991 }
2992
2993 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2994 {
2995 struct ieee80211_local *local = sdata->local;
2996 struct sta_info *sta;
2997
2998 rcu_read_lock();
2999
3000 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3001 if (sdata != sta->sdata &&
3002 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3003 continue;
3004 ieee80211_check_fast_xmit(sta);
3005 }
3006
3007 rcu_read_unlock();
3008 }
3009
3010 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3011 {
3012 struct ieee80211_fast_tx *fast_tx;
3013
3014 spin_lock_bh(&sta->lock);
3015 fast_tx = rcu_dereference_protected(sta->fast_tx,
3016 lockdep_is_held(&sta->lock));
3017 RCU_INIT_POINTER(sta->fast_tx, NULL);
3018 spin_unlock_bh(&sta->lock);
3019
3020 if (fast_tx)
3021 kfree_rcu(fast_tx, rcu_head);
3022 }
3023
3024 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3025 struct sk_buff *skb, int headroom,
3026 int *subframe_len)
3027 {
3028 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3029 int padding = (4 - amsdu_len) & 3;
3030
3031 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3032 I802_DEBUG_INC(local->tx_expand_skb_head);
3033
3034 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3035 wiphy_debug(local->hw.wiphy,
3036 "failed to reallocate TX buffer\n");
3037 return false;
3038 }
3039 }
3040
3041 if (padding) {
3042 *subframe_len += padding;
3043 memset(skb_put(skb, padding), 0, padding);
3044 }
3045
3046 return true;
3047 }
3048
3049 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3050 struct ieee80211_fast_tx *fast_tx,
3051 struct sk_buff *skb)
3052 {
3053 struct ieee80211_local *local = sdata->local;
3054 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3055 struct ieee80211_hdr *hdr;
3056 struct ethhdr *amsdu_hdr;
3057 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3058 int subframe_len = skb->len - hdr_len;
3059 void *data;
3060 u8 *qc, *h_80211_src, *h_80211_dst;
3061 const u8 *bssid;
3062
3063 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3064 return false;
3065
3066 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3067 return true;
3068
3069 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr),
3070 &subframe_len))
3071 return false;
3072
3073 data = skb_push(skb, sizeof(*amsdu_hdr));
3074 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3075 hdr = data;
3076 amsdu_hdr = data + hdr_len;
3077 /* h_80211_src/dst is addr* field within hdr */
3078 h_80211_src = data + fast_tx->sa_offs;
3079 h_80211_dst = data + fast_tx->da_offs;
3080
3081 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3082 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3083 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3084
3085 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3086 * fields needs to be changed to BSSID for A-MSDU frames depending
3087 * on FromDS/ToDS values.
3088 */
3089 switch (sdata->vif.type) {
3090 case NL80211_IFTYPE_STATION:
3091 bssid = sdata->u.mgd.bssid;
3092 break;
3093 case NL80211_IFTYPE_AP:
3094 case NL80211_IFTYPE_AP_VLAN:
3095 bssid = sdata->vif.addr;
3096 break;
3097 default:
3098 bssid = NULL;
3099 }
3100
3101 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3102 ether_addr_copy(h_80211_src, bssid);
3103
3104 if (bssid && ieee80211_has_tods(hdr->frame_control))
3105 ether_addr_copy(h_80211_dst, bssid);
3106
3107 qc = ieee80211_get_qos_ctl(hdr);
3108 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3109
3110 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3111
3112 return true;
3113 }
3114
3115 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3116 struct sta_info *sta,
3117 struct ieee80211_fast_tx *fast_tx,
3118 struct sk_buff *skb)
3119 {
3120 struct ieee80211_local *local = sdata->local;
3121 struct fq *fq = &local->fq;
3122 struct fq_tin *tin;
3123 struct fq_flow *flow;
3124 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3125 struct ieee80211_txq *txq = sta->sta.txq[tid];
3126 struct txq_info *txqi;
3127 struct sk_buff **frag_tail, *head;
3128 int subframe_len = skb->len - ETH_ALEN;
3129 u8 max_subframes = sta->sta.max_amsdu_subframes;
3130 int max_frags = local->hw.max_tx_fragments;
3131 int max_amsdu_len = sta->sta.max_amsdu_len;
3132 __be16 len;
3133 void *data;
3134 bool ret = false;
3135 unsigned int orig_len;
3136 int n = 1, nfrags;
3137
3138 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3139 return false;
3140
3141 if (!txq)
3142 return false;
3143
3144 txqi = to_txq_info(txq);
3145 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3146 return false;
3147
3148 if (sta->sta.max_rc_amsdu_len)
3149 max_amsdu_len = min_t(int, max_amsdu_len,
3150 sta->sta.max_rc_amsdu_len);
3151
3152 spin_lock_bh(&fq->lock);
3153
3154 /* TODO: Ideally aggregation should be done on dequeue to remain
3155 * responsive to environment changes.
3156 */
3157
3158 tin = &txqi->tin;
3159 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3160 head = skb_peek_tail(&flow->queue);
3161 if (!head)
3162 goto out;
3163
3164 orig_len = head->len;
3165
3166 if (skb->len + head->len > max_amsdu_len)
3167 goto out;
3168
3169 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3170 goto out;
3171
3172 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3173 nfrags += 1 + skb_shinfo(head)->nr_frags;
3174 frag_tail = &skb_shinfo(head)->frag_list;
3175 while (*frag_tail) {
3176 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3177 frag_tail = &(*frag_tail)->next;
3178 n++;
3179 }
3180
3181 if (max_subframes && n > max_subframes)
3182 goto out;
3183
3184 if (max_frags && nfrags > max_frags)
3185 goto out;
3186
3187 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3188 &subframe_len))
3189 goto out;
3190
3191 ret = true;
3192 data = skb_push(skb, ETH_ALEN + 2);
3193 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3194
3195 data += 2 * ETH_ALEN;
3196 len = cpu_to_be16(subframe_len);
3197 memcpy(data, &len, 2);
3198 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3199
3200 head->len += skb->len;
3201 head->data_len += skb->len;
3202 *frag_tail = skb;
3203
3204 flow->backlog += head->len - orig_len;
3205 tin->backlog_bytes += head->len - orig_len;
3206
3207 fq_recalc_backlog(fq, tin, flow);
3208
3209 out:
3210 spin_unlock_bh(&fq->lock);
3211
3212 return ret;
3213 }
3214
3215 /*
3216 * Can be called while the sta lock is held. Anything that can cause packets to
3217 * be generated will cause deadlock!
3218 */
3219 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3220 struct sta_info *sta, u8 pn_offs,
3221 struct ieee80211_key *key,
3222 struct sk_buff *skb)
3223 {
3224 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3225 struct ieee80211_hdr *hdr = (void *)skb->data;
3226 u8 tid = IEEE80211_NUM_TIDS;
3227
3228 if (key)
3229 info->control.hw_key = &key->conf;
3230
3231 ieee80211_tx_stats(skb->dev, skb->len);
3232
3233 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3234 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3235 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3236 } else {
3237 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3238 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3239 sdata->sequence_number += 0x10;
3240 }
3241
3242 if (skb_shinfo(skb)->gso_size)
3243 sta->tx_stats.msdu[tid] +=
3244 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3245 else
3246 sta->tx_stats.msdu[tid]++;
3247
3248 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3249
3250 /* statistics normally done by ieee80211_tx_h_stats (but that
3251 * has to consider fragmentation, so is more complex)
3252 */
3253 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3254 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3255
3256 if (pn_offs) {
3257 u64 pn;
3258 u8 *crypto_hdr = skb->data + pn_offs;
3259
3260 switch (key->conf.cipher) {
3261 case WLAN_CIPHER_SUITE_CCMP:
3262 case WLAN_CIPHER_SUITE_CCMP_256:
3263 case WLAN_CIPHER_SUITE_GCMP:
3264 case WLAN_CIPHER_SUITE_GCMP_256:
3265 pn = atomic64_inc_return(&key->conf.tx_pn);
3266 crypto_hdr[0] = pn;
3267 crypto_hdr[1] = pn >> 8;
3268 crypto_hdr[4] = pn >> 16;
3269 crypto_hdr[5] = pn >> 24;
3270 crypto_hdr[6] = pn >> 32;
3271 crypto_hdr[7] = pn >> 40;
3272 break;
3273 }
3274 }
3275 }
3276
3277 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3278 struct sta_info *sta,
3279 struct ieee80211_fast_tx *fast_tx,
3280 struct sk_buff *skb)
3281 {
3282 struct ieee80211_local *local = sdata->local;
3283 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3284 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3285 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3286 struct ethhdr eth;
3287 struct ieee80211_tx_info *info;
3288 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3289 struct ieee80211_tx_data tx;
3290 ieee80211_tx_result r;
3291 struct tid_ampdu_tx *tid_tx = NULL;
3292 u8 tid = IEEE80211_NUM_TIDS;
3293
3294 /* control port protocol needs a lot of special handling */
3295 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3296 return false;
3297
3298 /* only RFC 1042 SNAP */
3299 if (ethertype < ETH_P_802_3_MIN)
3300 return false;
3301
3302 /* don't handle TX status request here either */
3303 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3304 return false;
3305
3306 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3307 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3308 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3309 if (tid_tx) {
3310 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3311 return false;
3312 if (tid_tx->timeout)
3313 tid_tx->last_tx = jiffies;
3314 }
3315 }
3316
3317 /* after this point (skb is modified) we cannot return false */
3318
3319 if (skb_shared(skb)) {
3320 struct sk_buff *tmp_skb = skb;
3321
3322 skb = skb_clone(skb, GFP_ATOMIC);
3323 kfree_skb(tmp_skb);
3324
3325 if (!skb)
3326 return true;
3327 }
3328
3329 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3330 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3331 return true;
3332
3333 /* will not be crypto-handled beyond what we do here, so use false
3334 * as the may-encrypt argument for the resize to not account for
3335 * more room than we already have in 'extra_head'
3336 */
3337 if (unlikely(ieee80211_skb_resize(sdata, skb,
3338 max_t(int, extra_head + hw_headroom -
3339 skb_headroom(skb), 0),
3340 false))) {
3341 kfree_skb(skb);
3342 return true;
3343 }
3344
3345 memcpy(&eth, skb->data, ETH_HLEN - 2);
3346 hdr = (void *)skb_push(skb, extra_head);
3347 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3348 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3349 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3350
3351 info = IEEE80211_SKB_CB(skb);
3352 memset(info, 0, sizeof(*info));
3353 info->band = fast_tx->band;
3354 info->control.vif = &sdata->vif;
3355 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3356 IEEE80211_TX_CTL_DONTFRAG |
3357 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3358 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3359
3360 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3361 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3362 *ieee80211_get_qos_ctl(hdr) = tid;
3363 }
3364
3365 __skb_queue_head_init(&tx.skbs);
3366
3367 tx.flags = IEEE80211_TX_UNICAST;
3368 tx.local = local;
3369 tx.sdata = sdata;
3370 tx.sta = sta;
3371 tx.key = fast_tx->key;
3372
3373 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3374 tx.skb = skb;
3375 r = ieee80211_tx_h_rate_ctrl(&tx);
3376 skb = tx.skb;
3377 tx.skb = NULL;
3378
3379 if (r != TX_CONTINUE) {
3380 if (r != TX_QUEUED)
3381 kfree_skb(skb);
3382 return true;
3383 }
3384 }
3385
3386 if (ieee80211_queue_skb(local, sdata, sta, skb))
3387 return true;
3388
3389 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3390 fast_tx->key, skb);
3391
3392 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3393 sdata = container_of(sdata->bss,
3394 struct ieee80211_sub_if_data, u.ap);
3395
3396 __skb_queue_tail(&tx.skbs, skb);
3397 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3398 return true;
3399 }
3400
3401 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3402 struct ieee80211_txq *txq)
3403 {
3404 struct ieee80211_local *local = hw_to_local(hw);
3405 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3406 struct ieee80211_hdr *hdr;
3407 struct sk_buff *skb = NULL;
3408 struct fq *fq = &local->fq;
3409 struct fq_tin *tin = &txqi->tin;
3410 struct ieee80211_tx_info *info;
3411 struct ieee80211_tx_data tx;
3412 ieee80211_tx_result r;
3413
3414 spin_lock_bh(&fq->lock);
3415
3416 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3417 goto out;
3418
3419 /* Make sure fragments stay together. */
3420 skb = __skb_dequeue(&txqi->frags);
3421 if (skb)
3422 goto out;
3423
3424 begin:
3425 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3426 if (!skb)
3427 goto out;
3428
3429 ieee80211_set_skb_vif(skb, txqi);
3430
3431 hdr = (struct ieee80211_hdr *)skb->data;
3432 info = IEEE80211_SKB_CB(skb);
3433
3434 memset(&tx, 0, sizeof(tx));
3435 __skb_queue_head_init(&tx.skbs);
3436 tx.local = local;
3437 tx.skb = skb;
3438 tx.sdata = vif_to_sdata(info->control.vif);
3439
3440 if (txq->sta)
3441 tx.sta = container_of(txq->sta, struct sta_info, sta);
3442
3443 /*
3444 * The key can be removed while the packet was queued, so need to call
3445 * this here to get the current key.
3446 */
3447 r = ieee80211_tx_h_select_key(&tx);
3448 if (r != TX_CONTINUE) {
3449 ieee80211_free_txskb(&local->hw, skb);
3450 goto begin;
3451 }
3452
3453 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3454 info->flags |= IEEE80211_TX_CTL_AMPDU;
3455 else
3456 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3457
3458 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3459 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3460 sta);
3461 u8 pn_offs = 0;
3462
3463 if (tx.key &&
3464 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3465 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3466
3467 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3468 tx.key, skb);
3469 } else {
3470 if (invoke_tx_handlers_late(&tx))
3471 goto begin;
3472
3473 skb = __skb_dequeue(&tx.skbs);
3474
3475 if (!skb_queue_empty(&tx.skbs))
3476 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3477 }
3478
3479 if (skb && skb_has_frag_list(skb) &&
3480 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3481 if (skb_linearize(skb)) {
3482 ieee80211_free_txskb(&local->hw, skb);
3483 goto begin;
3484 }
3485 }
3486
3487 out:
3488 spin_unlock_bh(&fq->lock);
3489
3490 return skb;
3491 }
3492 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3493
3494 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3495 struct net_device *dev,
3496 u32 info_flags)
3497 {
3498 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3499 struct sta_info *sta;
3500 struct sk_buff *next;
3501
3502 if (unlikely(skb->len < ETH_HLEN)) {
3503 kfree_skb(skb);
3504 return;
3505 }
3506
3507 rcu_read_lock();
3508
3509 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3510 goto out_free;
3511
3512 if (!IS_ERR_OR_NULL(sta)) {
3513 struct ieee80211_fast_tx *fast_tx;
3514
3515 fast_tx = rcu_dereference(sta->fast_tx);
3516
3517 if (fast_tx &&
3518 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3519 goto out;
3520 }
3521
3522 if (skb_is_gso(skb)) {
3523 struct sk_buff *segs;
3524
3525 segs = skb_gso_segment(skb, 0);
3526 if (IS_ERR(segs)) {
3527 goto out_free;
3528 } else if (segs) {
3529 consume_skb(skb);
3530 skb = segs;
3531 }
3532 } else {
3533 /* we cannot process non-linear frames on this path */
3534 if (skb_linearize(skb)) {
3535 kfree_skb(skb);
3536 goto out;
3537 }
3538
3539 /* the frame could be fragmented, software-encrypted, and other
3540 * things so we cannot really handle checksum offload with it -
3541 * fix it up in software before we handle anything else.
3542 */
3543 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3544 skb_set_transport_header(skb,
3545 skb_checksum_start_offset(skb));
3546 if (skb_checksum_help(skb))
3547 goto out_free;
3548 }
3549 }
3550
3551 next = skb;
3552 while (next) {
3553 skb = next;
3554 next = skb->next;
3555
3556 skb->prev = NULL;
3557 skb->next = NULL;
3558
3559 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3560 if (IS_ERR(skb))
3561 goto out;
3562
3563 ieee80211_tx_stats(dev, skb->len);
3564
3565 ieee80211_xmit(sdata, sta, skb);
3566 }
3567 goto out;
3568 out_free:
3569 kfree_skb(skb);
3570 out:
3571 rcu_read_unlock();
3572 }
3573
3574 /**
3575 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3576 * @skb: packet to be sent
3577 * @dev: incoming interface
3578 *
3579 * On failure skb will be freed.
3580 */
3581 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3582 struct net_device *dev)
3583 {
3584 __ieee80211_subif_start_xmit(skb, dev, 0);
3585 return NETDEV_TX_OK;
3586 }
3587
3588 struct sk_buff *
3589 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3590 struct sk_buff *skb, u32 info_flags)
3591 {
3592 struct ieee80211_hdr *hdr;
3593 struct ieee80211_tx_data tx = {
3594 .local = sdata->local,
3595 .sdata = sdata,
3596 };
3597 struct sta_info *sta;
3598
3599 rcu_read_lock();
3600
3601 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3602 kfree_skb(skb);
3603 skb = ERR_PTR(-EINVAL);
3604 goto out;
3605 }
3606
3607 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3608 if (IS_ERR(skb))
3609 goto out;
3610
3611 hdr = (void *)skb->data;
3612 tx.sta = sta_info_get(sdata, hdr->addr1);
3613 tx.skb = skb;
3614
3615 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3616 rcu_read_unlock();
3617 kfree_skb(skb);
3618 return ERR_PTR(-EINVAL);
3619 }
3620
3621 out:
3622 rcu_read_unlock();
3623 return skb;
3624 }
3625
3626 /*
3627 * ieee80211_clear_tx_pending may not be called in a context where
3628 * it is possible that it packets could come in again.
3629 */
3630 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3631 {
3632 struct sk_buff *skb;
3633 int i;
3634
3635 for (i = 0; i < local->hw.queues; i++) {
3636 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3637 ieee80211_free_txskb(&local->hw, skb);
3638 }
3639 }
3640
3641 /*
3642 * Returns false if the frame couldn't be transmitted but was queued instead,
3643 * which in this case means re-queued -- take as an indication to stop sending
3644 * more pending frames.
3645 */
3646 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3647 struct sk_buff *skb)
3648 {
3649 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3650 struct ieee80211_sub_if_data *sdata;
3651 struct sta_info *sta;
3652 struct ieee80211_hdr *hdr;
3653 bool result;
3654 struct ieee80211_chanctx_conf *chanctx_conf;
3655
3656 sdata = vif_to_sdata(info->control.vif);
3657
3658 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3659 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3660 if (unlikely(!chanctx_conf)) {
3661 dev_kfree_skb(skb);
3662 return true;
3663 }
3664 info->band = chanctx_conf->def.chan->band;
3665 result = ieee80211_tx(sdata, NULL, skb, true);
3666 } else {
3667 struct sk_buff_head skbs;
3668
3669 __skb_queue_head_init(&skbs);
3670 __skb_queue_tail(&skbs, skb);
3671
3672 hdr = (struct ieee80211_hdr *)skb->data;
3673 sta = sta_info_get(sdata, hdr->addr1);
3674
3675 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3676 }
3677
3678 return result;
3679 }
3680
3681 /*
3682 * Transmit all pending packets. Called from tasklet.
3683 */
3684 void ieee80211_tx_pending(unsigned long data)
3685 {
3686 struct ieee80211_local *local = (struct ieee80211_local *)data;
3687 unsigned long flags;
3688 int i;
3689 bool txok;
3690
3691 rcu_read_lock();
3692
3693 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3694 for (i = 0; i < local->hw.queues; i++) {
3695 /*
3696 * If queue is stopped by something other than due to pending
3697 * frames, or we have no pending frames, proceed to next queue.
3698 */
3699 if (local->queue_stop_reasons[i] ||
3700 skb_queue_empty(&local->pending[i]))
3701 continue;
3702
3703 while (!skb_queue_empty(&local->pending[i])) {
3704 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3705 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3706
3707 if (WARN_ON(!info->control.vif)) {
3708 ieee80211_free_txskb(&local->hw, skb);
3709 continue;
3710 }
3711
3712 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3713 flags);
3714
3715 txok = ieee80211_tx_pending_skb(local, skb);
3716 spin_lock_irqsave(&local->queue_stop_reason_lock,
3717 flags);
3718 if (!txok)
3719 break;
3720 }
3721
3722 if (skb_queue_empty(&local->pending[i]))
3723 ieee80211_propagate_queue_wake(local, i);
3724 }
3725 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3726
3727 rcu_read_unlock();
3728 }
3729
3730 /* functions for drivers to get certain frames */
3731
3732 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3733 struct ps_data *ps, struct sk_buff *skb,
3734 bool is_template)
3735 {
3736 u8 *pos, *tim;
3737 int aid0 = 0;
3738 int i, have_bits = 0, n1, n2;
3739
3740 /* Generate bitmap for TIM only if there are any STAs in power save
3741 * mode. */
3742 if (atomic_read(&ps->num_sta_ps) > 0)
3743 /* in the hope that this is faster than
3744 * checking byte-for-byte */
3745 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3746 IEEE80211_MAX_AID+1);
3747 if (!is_template) {
3748 if (ps->dtim_count == 0)
3749 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3750 else
3751 ps->dtim_count--;
3752 }
3753
3754 tim = pos = (u8 *) skb_put(skb, 6);
3755 *pos++ = WLAN_EID_TIM;
3756 *pos++ = 4;
3757 *pos++ = ps->dtim_count;
3758 *pos++ = sdata->vif.bss_conf.dtim_period;
3759
3760 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3761 aid0 = 1;
3762
3763 ps->dtim_bc_mc = aid0 == 1;
3764
3765 if (have_bits) {
3766 /* Find largest even number N1 so that bits numbered 1 through
3767 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3768 * (N2 + 1) x 8 through 2007 are 0. */
3769 n1 = 0;
3770 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3771 if (ps->tim[i]) {
3772 n1 = i & 0xfe;
3773 break;
3774 }
3775 }
3776 n2 = n1;
3777 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3778 if (ps->tim[i]) {
3779 n2 = i;
3780 break;
3781 }
3782 }
3783
3784 /* Bitmap control */
3785 *pos++ = n1 | aid0;
3786 /* Part Virt Bitmap */
3787 skb_put(skb, n2 - n1);
3788 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3789
3790 tim[1] = n2 - n1 + 4;
3791 } else {
3792 *pos++ = aid0; /* Bitmap control */
3793 *pos++ = 0; /* Part Virt Bitmap */
3794 }
3795 }
3796
3797 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3798 struct ps_data *ps, struct sk_buff *skb,
3799 bool is_template)
3800 {
3801 struct ieee80211_local *local = sdata->local;
3802
3803 /*
3804 * Not very nice, but we want to allow the driver to call
3805 * ieee80211_beacon_get() as a response to the set_tim()
3806 * callback. That, however, is already invoked under the
3807 * sta_lock to guarantee consistent and race-free update
3808 * of the tim bitmap in mac80211 and the driver.
3809 */
3810 if (local->tim_in_locked_section) {
3811 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3812 } else {
3813 spin_lock_bh(&local->tim_lock);
3814 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3815 spin_unlock_bh(&local->tim_lock);
3816 }
3817
3818 return 0;
3819 }
3820
3821 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3822 struct beacon_data *beacon)
3823 {
3824 struct probe_resp *resp;
3825 u8 *beacon_data;
3826 size_t beacon_data_len;
3827 int i;
3828 u8 count = beacon->csa_current_counter;
3829
3830 switch (sdata->vif.type) {
3831 case NL80211_IFTYPE_AP:
3832 beacon_data = beacon->tail;
3833 beacon_data_len = beacon->tail_len;
3834 break;
3835 case NL80211_IFTYPE_ADHOC:
3836 beacon_data = beacon->head;
3837 beacon_data_len = beacon->head_len;
3838 break;
3839 case NL80211_IFTYPE_MESH_POINT:
3840 beacon_data = beacon->head;
3841 beacon_data_len = beacon->head_len;
3842 break;
3843 default:
3844 return;
3845 }
3846
3847 rcu_read_lock();
3848 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3849 resp = rcu_dereference(sdata->u.ap.probe_resp);
3850
3851 if (beacon->csa_counter_offsets[i]) {
3852 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3853 beacon_data_len)) {
3854 rcu_read_unlock();
3855 return;
3856 }
3857
3858 beacon_data[beacon->csa_counter_offsets[i]] = count;
3859 }
3860
3861 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3862 resp->data[resp->csa_counter_offsets[i]] = count;
3863 }
3864 rcu_read_unlock();
3865 }
3866
3867 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3868 {
3869 beacon->csa_current_counter--;
3870
3871 /* the counter should never reach 0 */
3872 WARN_ON_ONCE(!beacon->csa_current_counter);
3873
3874 return beacon->csa_current_counter;
3875 }
3876
3877 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3878 {
3879 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3880 struct beacon_data *beacon = NULL;
3881 u8 count = 0;
3882
3883 rcu_read_lock();
3884
3885 if (sdata->vif.type == NL80211_IFTYPE_AP)
3886 beacon = rcu_dereference(sdata->u.ap.beacon);
3887 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3888 beacon = rcu_dereference(sdata->u.ibss.presp);
3889 else if (ieee80211_vif_is_mesh(&sdata->vif))
3890 beacon = rcu_dereference(sdata->u.mesh.beacon);
3891
3892 if (!beacon)
3893 goto unlock;
3894
3895 count = __ieee80211_csa_update_counter(beacon);
3896
3897 unlock:
3898 rcu_read_unlock();
3899 return count;
3900 }
3901 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3902
3903 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3904 {
3905 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3906 struct beacon_data *beacon = NULL;
3907 u8 *beacon_data;
3908 size_t beacon_data_len;
3909 int ret = false;
3910
3911 if (!ieee80211_sdata_running(sdata))
3912 return false;
3913
3914 rcu_read_lock();
3915 if (vif->type == NL80211_IFTYPE_AP) {
3916 struct ieee80211_if_ap *ap = &sdata->u.ap;
3917
3918 beacon = rcu_dereference(ap->beacon);
3919 if (WARN_ON(!beacon || !beacon->tail))
3920 goto out;
3921 beacon_data = beacon->tail;
3922 beacon_data_len = beacon->tail_len;
3923 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3924 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3925
3926 beacon = rcu_dereference(ifibss->presp);
3927 if (!beacon)
3928 goto out;
3929
3930 beacon_data = beacon->head;
3931 beacon_data_len = beacon->head_len;
3932 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3933 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3934
3935 beacon = rcu_dereference(ifmsh->beacon);
3936 if (!beacon)
3937 goto out;
3938
3939 beacon_data = beacon->head;
3940 beacon_data_len = beacon->head_len;
3941 } else {
3942 WARN_ON(1);
3943 goto out;
3944 }
3945
3946 if (!beacon->csa_counter_offsets[0])
3947 goto out;
3948
3949 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3950 goto out;
3951
3952 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3953 ret = true;
3954 out:
3955 rcu_read_unlock();
3956
3957 return ret;
3958 }
3959 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3960
3961 static struct sk_buff *
3962 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3963 struct ieee80211_vif *vif,
3964 struct ieee80211_mutable_offsets *offs,
3965 bool is_template)
3966 {
3967 struct ieee80211_local *local = hw_to_local(hw);
3968 struct beacon_data *beacon = NULL;
3969 struct sk_buff *skb = NULL;
3970 struct ieee80211_tx_info *info;
3971 struct ieee80211_sub_if_data *sdata = NULL;
3972 enum nl80211_band band;
3973 struct ieee80211_tx_rate_control txrc;
3974 struct ieee80211_chanctx_conf *chanctx_conf;
3975 int csa_off_base = 0;
3976
3977 rcu_read_lock();
3978
3979 sdata = vif_to_sdata(vif);
3980 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3981
3982 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3983 goto out;
3984
3985 if (offs)
3986 memset(offs, 0, sizeof(*offs));
3987
3988 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3989 struct ieee80211_if_ap *ap = &sdata->u.ap;
3990
3991 beacon = rcu_dereference(ap->beacon);
3992 if (beacon) {
3993 if (beacon->csa_counter_offsets[0]) {
3994 if (!is_template)
3995 __ieee80211_csa_update_counter(beacon);
3996
3997 ieee80211_set_csa(sdata, beacon);
3998 }
3999
4000 /*
4001 * headroom, head length,
4002 * tail length and maximum TIM length
4003 */
4004 skb = dev_alloc_skb(local->tx_headroom +
4005 beacon->head_len +
4006 beacon->tail_len + 256 +
4007 local->hw.extra_beacon_tailroom);
4008 if (!skb)
4009 goto out;
4010
4011 skb_reserve(skb, local->tx_headroom);
4012 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4013 beacon->head_len);
4014
4015 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4016 is_template);
4017
4018 if (offs) {
4019 offs->tim_offset = beacon->head_len;
4020 offs->tim_length = skb->len - beacon->head_len;
4021
4022 /* for AP the csa offsets are from tail */
4023 csa_off_base = skb->len;
4024 }
4025
4026 if (beacon->tail)
4027 memcpy(skb_put(skb, beacon->tail_len),
4028 beacon->tail, beacon->tail_len);
4029 } else
4030 goto out;
4031 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4032 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4033 struct ieee80211_hdr *hdr;
4034
4035 beacon = rcu_dereference(ifibss->presp);
4036 if (!beacon)
4037 goto out;
4038
4039 if (beacon->csa_counter_offsets[0]) {
4040 if (!is_template)
4041 __ieee80211_csa_update_counter(beacon);
4042
4043 ieee80211_set_csa(sdata, beacon);
4044 }
4045
4046 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4047 local->hw.extra_beacon_tailroom);
4048 if (!skb)
4049 goto out;
4050 skb_reserve(skb, local->tx_headroom);
4051 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4052 beacon->head_len);
4053
4054 hdr = (struct ieee80211_hdr *) skb->data;
4055 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4056 IEEE80211_STYPE_BEACON);
4057 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4058 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4059
4060 beacon = rcu_dereference(ifmsh->beacon);
4061 if (!beacon)
4062 goto out;
4063
4064 if (beacon->csa_counter_offsets[0]) {
4065 if (!is_template)
4066 /* TODO: For mesh csa_counter is in TU, so
4067 * decrementing it by one isn't correct, but
4068 * for now we leave it consistent with overall
4069 * mac80211's behavior.
4070 */
4071 __ieee80211_csa_update_counter(beacon);
4072
4073 ieee80211_set_csa(sdata, beacon);
4074 }
4075
4076 if (ifmsh->sync_ops)
4077 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
4078
4079 skb = dev_alloc_skb(local->tx_headroom +
4080 beacon->head_len +
4081 256 + /* TIM IE */
4082 beacon->tail_len +
4083 local->hw.extra_beacon_tailroom);
4084 if (!skb)
4085 goto out;
4086 skb_reserve(skb, local->tx_headroom);
4087 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4088 beacon->head_len);
4089 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4090
4091 if (offs) {
4092 offs->tim_offset = beacon->head_len;
4093 offs->tim_length = skb->len - beacon->head_len;
4094 }
4095
4096 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
4097 beacon->tail_len);
4098 } else {
4099 WARN_ON(1);
4100 goto out;
4101 }
4102
4103 /* CSA offsets */
4104 if (offs && beacon) {
4105 int i;
4106
4107 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4108 u16 csa_off = beacon->csa_counter_offsets[i];
4109
4110 if (!csa_off)
4111 continue;
4112
4113 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4114 }
4115 }
4116
4117 band = chanctx_conf->def.chan->band;
4118
4119 info = IEEE80211_SKB_CB(skb);
4120
4121 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4122 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4123 info->band = band;
4124
4125 memset(&txrc, 0, sizeof(txrc));
4126 txrc.hw = hw;
4127 txrc.sband = local->hw.wiphy->bands[band];
4128 txrc.bss_conf = &sdata->vif.bss_conf;
4129 txrc.skb = skb;
4130 txrc.reported_rate.idx = -1;
4131 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4132 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
4133 txrc.max_rate_idx = -1;
4134 else
4135 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
4136 txrc.bss = true;
4137 rate_control_get_rate(sdata, NULL, &txrc);
4138
4139 info->control.vif = vif;
4140
4141 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4142 IEEE80211_TX_CTL_ASSIGN_SEQ |
4143 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4144 out:
4145 rcu_read_unlock();
4146 return skb;
4147
4148 }
4149
4150 struct sk_buff *
4151 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4152 struct ieee80211_vif *vif,
4153 struct ieee80211_mutable_offsets *offs)
4154 {
4155 return __ieee80211_beacon_get(hw, vif, offs, true);
4156 }
4157 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4158
4159 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4160 struct ieee80211_vif *vif,
4161 u16 *tim_offset, u16 *tim_length)
4162 {
4163 struct ieee80211_mutable_offsets offs = {};
4164 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4165 struct sk_buff *copy;
4166 struct ieee80211_supported_band *sband;
4167 int shift;
4168
4169 if (!bcn)
4170 return bcn;
4171
4172 if (tim_offset)
4173 *tim_offset = offs.tim_offset;
4174
4175 if (tim_length)
4176 *tim_length = offs.tim_length;
4177
4178 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4179 !hw_to_local(hw)->monitors)
4180 return bcn;
4181
4182 /* send a copy to monitor interfaces */
4183 copy = skb_copy(bcn, GFP_ATOMIC);
4184 if (!copy)
4185 return bcn;
4186
4187 shift = ieee80211_vif_get_shift(vif);
4188 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
4189 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4190
4191 return bcn;
4192 }
4193 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4194
4195 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4196 struct ieee80211_vif *vif)
4197 {
4198 struct ieee80211_if_ap *ap = NULL;
4199 struct sk_buff *skb = NULL;
4200 struct probe_resp *presp = NULL;
4201 struct ieee80211_hdr *hdr;
4202 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4203
4204 if (sdata->vif.type != NL80211_IFTYPE_AP)
4205 return NULL;
4206
4207 rcu_read_lock();
4208
4209 ap = &sdata->u.ap;
4210 presp = rcu_dereference(ap->probe_resp);
4211 if (!presp)
4212 goto out;
4213
4214 skb = dev_alloc_skb(presp->len);
4215 if (!skb)
4216 goto out;
4217
4218 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
4219
4220 hdr = (struct ieee80211_hdr *) skb->data;
4221 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4222
4223 out:
4224 rcu_read_unlock();
4225 return skb;
4226 }
4227 EXPORT_SYMBOL(ieee80211_proberesp_get);
4228
4229 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4230 struct ieee80211_vif *vif)
4231 {
4232 struct ieee80211_sub_if_data *sdata;
4233 struct ieee80211_if_managed *ifmgd;
4234 struct ieee80211_pspoll *pspoll;
4235 struct ieee80211_local *local;
4236 struct sk_buff *skb;
4237
4238 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4239 return NULL;
4240
4241 sdata = vif_to_sdata(vif);
4242 ifmgd = &sdata->u.mgd;
4243 local = sdata->local;
4244
4245 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4246 if (!skb)
4247 return NULL;
4248
4249 skb_reserve(skb, local->hw.extra_tx_headroom);
4250
4251 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
4252 memset(pspoll, 0, sizeof(*pspoll));
4253 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4254 IEEE80211_STYPE_PSPOLL);
4255 pspoll->aid = cpu_to_le16(ifmgd->aid);
4256
4257 /* aid in PS-Poll has its two MSBs each set to 1 */
4258 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4259
4260 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4261 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4262
4263 return skb;
4264 }
4265 EXPORT_SYMBOL(ieee80211_pspoll_get);
4266
4267 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4268 struct ieee80211_vif *vif)
4269 {
4270 struct ieee80211_hdr_3addr *nullfunc;
4271 struct ieee80211_sub_if_data *sdata;
4272 struct ieee80211_if_managed *ifmgd;
4273 struct ieee80211_local *local;
4274 struct sk_buff *skb;
4275
4276 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4277 return NULL;
4278
4279 sdata = vif_to_sdata(vif);
4280 ifmgd = &sdata->u.mgd;
4281 local = sdata->local;
4282
4283 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
4284 if (!skb)
4285 return NULL;
4286
4287 skb_reserve(skb, local->hw.extra_tx_headroom);
4288
4289 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
4290 sizeof(*nullfunc));
4291 memset(nullfunc, 0, sizeof(*nullfunc));
4292 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4293 IEEE80211_STYPE_NULLFUNC |
4294 IEEE80211_FCTL_TODS);
4295 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4296 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4297 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4298
4299 return skb;
4300 }
4301 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4302
4303 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4304 const u8 *src_addr,
4305 const u8 *ssid, size_t ssid_len,
4306 size_t tailroom)
4307 {
4308 struct ieee80211_local *local = hw_to_local(hw);
4309 struct ieee80211_hdr_3addr *hdr;
4310 struct sk_buff *skb;
4311 size_t ie_ssid_len;
4312 u8 *pos;
4313
4314 ie_ssid_len = 2 + ssid_len;
4315
4316 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4317 ie_ssid_len + tailroom);
4318 if (!skb)
4319 return NULL;
4320
4321 skb_reserve(skb, local->hw.extra_tx_headroom);
4322
4323 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
4324 memset(hdr, 0, sizeof(*hdr));
4325 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4326 IEEE80211_STYPE_PROBE_REQ);
4327 eth_broadcast_addr(hdr->addr1);
4328 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4329 eth_broadcast_addr(hdr->addr3);
4330
4331 pos = skb_put(skb, ie_ssid_len);
4332 *pos++ = WLAN_EID_SSID;
4333 *pos++ = ssid_len;
4334 if (ssid_len)
4335 memcpy(pos, ssid, ssid_len);
4336 pos += ssid_len;
4337
4338 return skb;
4339 }
4340 EXPORT_SYMBOL(ieee80211_probereq_get);
4341
4342 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4343 const void *frame, size_t frame_len,
4344 const struct ieee80211_tx_info *frame_txctl,
4345 struct ieee80211_rts *rts)
4346 {
4347 const struct ieee80211_hdr *hdr = frame;
4348
4349 rts->frame_control =
4350 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4351 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4352 frame_txctl);
4353 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4354 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4355 }
4356 EXPORT_SYMBOL(ieee80211_rts_get);
4357
4358 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4359 const void *frame, size_t frame_len,
4360 const struct ieee80211_tx_info *frame_txctl,
4361 struct ieee80211_cts *cts)
4362 {
4363 const struct ieee80211_hdr *hdr = frame;
4364
4365 cts->frame_control =
4366 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4367 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4368 frame_len, frame_txctl);
4369 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4370 }
4371 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4372
4373 struct sk_buff *
4374 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4375 struct ieee80211_vif *vif)
4376 {
4377 struct ieee80211_local *local = hw_to_local(hw);
4378 struct sk_buff *skb = NULL;
4379 struct ieee80211_tx_data tx;
4380 struct ieee80211_sub_if_data *sdata;
4381 struct ps_data *ps;
4382 struct ieee80211_tx_info *info;
4383 struct ieee80211_chanctx_conf *chanctx_conf;
4384
4385 sdata = vif_to_sdata(vif);
4386
4387 rcu_read_lock();
4388 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4389
4390 if (!chanctx_conf)
4391 goto out;
4392
4393 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4394 struct beacon_data *beacon =
4395 rcu_dereference(sdata->u.ap.beacon);
4396
4397 if (!beacon || !beacon->head)
4398 goto out;
4399
4400 ps = &sdata->u.ap.ps;
4401 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4402 ps = &sdata->u.mesh.ps;
4403 } else {
4404 goto out;
4405 }
4406
4407 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4408 goto out; /* send buffered bc/mc only after DTIM beacon */
4409
4410 while (1) {
4411 skb = skb_dequeue(&ps->bc_buf);
4412 if (!skb)
4413 goto out;
4414 local->total_ps_buffered--;
4415
4416 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4417 struct ieee80211_hdr *hdr =
4418 (struct ieee80211_hdr *) skb->data;
4419 /* more buffered multicast/broadcast frames ==> set
4420 * MoreData flag in IEEE 802.11 header to inform PS
4421 * STAs */
4422 hdr->frame_control |=
4423 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4424 }
4425
4426 if (sdata->vif.type == NL80211_IFTYPE_AP)
4427 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4428 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4429 break;
4430 ieee80211_free_txskb(hw, skb);
4431 }
4432
4433 info = IEEE80211_SKB_CB(skb);
4434
4435 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4436 info->band = chanctx_conf->def.chan->band;
4437
4438 if (invoke_tx_handlers(&tx))
4439 skb = NULL;
4440 out:
4441 rcu_read_unlock();
4442
4443 return skb;
4444 }
4445 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4446
4447 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4448 {
4449 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4450 struct ieee80211_sub_if_data *sdata = sta->sdata;
4451 struct ieee80211_local *local = sdata->local;
4452 int ret;
4453 u32 queues;
4454
4455 lockdep_assert_held(&local->sta_mtx);
4456
4457 /* only some cases are supported right now */
4458 switch (sdata->vif.type) {
4459 case NL80211_IFTYPE_STATION:
4460 case NL80211_IFTYPE_AP:
4461 case NL80211_IFTYPE_AP_VLAN:
4462 break;
4463 default:
4464 WARN_ON(1);
4465 return -EINVAL;
4466 }
4467
4468 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4469 return -EINVAL;
4470
4471 if (sta->reserved_tid == tid) {
4472 ret = 0;
4473 goto out;
4474 }
4475
4476 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4477 sdata_err(sdata, "TID reservation already active\n");
4478 ret = -EALREADY;
4479 goto out;
4480 }
4481
4482 ieee80211_stop_vif_queues(sdata->local, sdata,
4483 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4484
4485 synchronize_net();
4486
4487 /* Tear down BA sessions so we stop aggregating on this TID */
4488 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4489 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4490 __ieee80211_stop_tx_ba_session(sta, tid,
4491 AGG_STOP_LOCAL_REQUEST);
4492 }
4493
4494 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4495 __ieee80211_flush_queues(local, sdata, queues, false);
4496
4497 sta->reserved_tid = tid;
4498
4499 ieee80211_wake_vif_queues(local, sdata,
4500 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4501
4502 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4503 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4504
4505 ret = 0;
4506 out:
4507 return ret;
4508 }
4509 EXPORT_SYMBOL(ieee80211_reserve_tid);
4510
4511 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4512 {
4513 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4514 struct ieee80211_sub_if_data *sdata = sta->sdata;
4515
4516 lockdep_assert_held(&sdata->local->sta_mtx);
4517
4518 /* only some cases are supported right now */
4519 switch (sdata->vif.type) {
4520 case NL80211_IFTYPE_STATION:
4521 case NL80211_IFTYPE_AP:
4522 case NL80211_IFTYPE_AP_VLAN:
4523 break;
4524 default:
4525 WARN_ON(1);
4526 return;
4527 }
4528
4529 if (tid != sta->reserved_tid) {
4530 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4531 return;
4532 }
4533
4534 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4535 }
4536 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4537
4538 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4539 struct sk_buff *skb, int tid,
4540 enum nl80211_band band)
4541 {
4542 int ac = ieee802_1d_to_ac[tid & 7];
4543
4544 skb_reset_mac_header(skb);
4545 skb_set_queue_mapping(skb, ac);
4546 skb->priority = tid;
4547
4548 skb->dev = sdata->dev;
4549
4550 /*
4551 * The other path calling ieee80211_xmit is from the tasklet,
4552 * and while we can handle concurrent transmissions locking
4553 * requirements are that we do not come into tx with bhs on.
4554 */
4555 local_bh_disable();
4556 IEEE80211_SKB_CB(skb)->band = band;
4557 ieee80211_xmit(sdata, NULL, skb);
4558 local_bh_enable();
4559 }
Linux with added FPC-III support