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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/if_vlan.h>
20 #include <linux/etherdevice.h>
21 #include <linux/bitmap.h>
22 #include <linux/rcupdate.h>
23 #include <linux/export.h>
24 #include <net/net_namespace.h>
25 #include <net/ieee80211_radiotap.h>
26 #include <net/cfg80211.h>
27 #include <net/mac80211.h>
28 #include <net/codel.h>
29 #include <net/codel_impl.h>
30 #include <asm/unaligned.h>
31 #include <net/fq_impl.h>
32
33 #include "ieee80211_i.h"
34 #include "driver-ops.h"
35 #include "led.h"
36 #include "mesh.h"
37 #include "wep.h"
38 #include "wpa.h"
39 #include "wme.h"
40 #include "rate.h"
41
42 /* misc utils */
43
44 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
45 {
46 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
47
48 u64_stats_update_begin(&tstats->syncp);
49 tstats->tx_packets++;
50 tstats->tx_bytes += len;
51 u64_stats_update_end(&tstats->syncp);
52 }
53
54 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
55 struct sk_buff *skb, int group_addr,
56 int next_frag_len)
57 {
58 int rate, mrate, erp, dur, i, shift = 0;
59 struct ieee80211_rate *txrate;
60 struct ieee80211_local *local = tx->local;
61 struct ieee80211_supported_band *sband;
62 struct ieee80211_hdr *hdr;
63 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
64 struct ieee80211_chanctx_conf *chanctx_conf;
65 u32 rate_flags = 0;
66
67 /* assume HW handles this */
68 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
69 return 0;
70
71 rcu_read_lock();
72 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
73 if (chanctx_conf) {
74 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
75 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
76 }
77 rcu_read_unlock();
78
79 /* uh huh? */
80 if (WARN_ON_ONCE(tx->rate.idx < 0))
81 return 0;
82
83 sband = local->hw.wiphy->bands[info->band];
84 txrate = &sband->bitrates[tx->rate.idx];
85
86 erp = txrate->flags & IEEE80211_RATE_ERP_G;
87
88 /*
89 * data and mgmt (except PS Poll):
90 * - during CFP: 32768
91 * - during contention period:
92 * if addr1 is group address: 0
93 * if more fragments = 0 and addr1 is individual address: time to
94 * transmit one ACK plus SIFS
95 * if more fragments = 1 and addr1 is individual address: time to
96 * transmit next fragment plus 2 x ACK plus 3 x SIFS
97 *
98 * IEEE 802.11, 9.6:
99 * - control response frame (CTS or ACK) shall be transmitted using the
100 * same rate as the immediately previous frame in the frame exchange
101 * sequence, if this rate belongs to the PHY mandatory rates, or else
102 * at the highest possible rate belonging to the PHY rates in the
103 * BSSBasicRateSet
104 */
105 hdr = (struct ieee80211_hdr *)skb->data;
106 if (ieee80211_is_ctl(hdr->frame_control)) {
107 /* TODO: These control frames are not currently sent by
108 * mac80211, but should they be implemented, this function
109 * needs to be updated to support duration field calculation.
110 *
111 * RTS: time needed to transmit pending data/mgmt frame plus
112 * one CTS frame plus one ACK frame plus 3 x SIFS
113 * CTS: duration of immediately previous RTS minus time
114 * required to transmit CTS and its SIFS
115 * ACK: 0 if immediately previous directed data/mgmt had
116 * more=0, with more=1 duration in ACK frame is duration
117 * from previous frame minus time needed to transmit ACK
118 * and its SIFS
119 * PS Poll: BIT(15) | BIT(14) | aid
120 */
121 return 0;
122 }
123
124 /* data/mgmt */
125 if (0 /* FIX: data/mgmt during CFP */)
126 return cpu_to_le16(32768);
127
128 if (group_addr) /* Group address as the destination - no ACK */
129 return 0;
130
131 /* Individual destination address:
132 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
133 * CTS and ACK frames shall be transmitted using the highest rate in
134 * basic rate set that is less than or equal to the rate of the
135 * immediately previous frame and that is using the same modulation
136 * (CCK or OFDM). If no basic rate set matches with these requirements,
137 * the highest mandatory rate of the PHY that is less than or equal to
138 * the rate of the previous frame is used.
139 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
140 */
141 rate = -1;
142 /* use lowest available if everything fails */
143 mrate = sband->bitrates[0].bitrate;
144 for (i = 0; i < sband->n_bitrates; i++) {
145 struct ieee80211_rate *r = &sband->bitrates[i];
146
147 if (r->bitrate > txrate->bitrate)
148 break;
149
150 if ((rate_flags & r->flags) != rate_flags)
151 continue;
152
153 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
154 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
155
156 switch (sband->band) {
157 case NL80211_BAND_2GHZ: {
158 u32 flag;
159 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
160 flag = IEEE80211_RATE_MANDATORY_G;
161 else
162 flag = IEEE80211_RATE_MANDATORY_B;
163 if (r->flags & flag)
164 mrate = r->bitrate;
165 break;
166 }
167 case NL80211_BAND_5GHZ:
168 if (r->flags & IEEE80211_RATE_MANDATORY_A)
169 mrate = r->bitrate;
170 break;
171 case NL80211_BAND_60GHZ:
172 /* TODO, for now fall through */
173 case NUM_NL80211_BANDS:
174 WARN_ON(1);
175 break;
176 }
177 }
178 if (rate == -1) {
179 /* No matching basic rate found; use highest suitable mandatory
180 * PHY rate */
181 rate = DIV_ROUND_UP(mrate, 1 << shift);
182 }
183
184 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
185 if (ieee80211_is_data_qos(hdr->frame_control) &&
186 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
187 dur = 0;
188 else
189 /* Time needed to transmit ACK
190 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
191 * to closest integer */
192 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
193 tx->sdata->vif.bss_conf.use_short_preamble,
194 shift);
195
196 if (next_frag_len) {
197 /* Frame is fragmented: duration increases with time needed to
198 * transmit next fragment plus ACK and 2 x SIFS. */
199 dur *= 2; /* ACK + SIFS */
200 /* next fragment */
201 dur += ieee80211_frame_duration(sband->band, next_frag_len,
202 txrate->bitrate, erp,
203 tx->sdata->vif.bss_conf.use_short_preamble,
204 shift);
205 }
206
207 return cpu_to_le16(dur);
208 }
209
210 /* tx handlers */
211 static ieee80211_tx_result debug_noinline
212 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
213 {
214 struct ieee80211_local *local = tx->local;
215 struct ieee80211_if_managed *ifmgd;
216
217 /* driver doesn't support power save */
218 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
219 return TX_CONTINUE;
220
221 /* hardware does dynamic power save */
222 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
223 return TX_CONTINUE;
224
225 /* dynamic power save disabled */
226 if (local->hw.conf.dynamic_ps_timeout <= 0)
227 return TX_CONTINUE;
228
229 /* we are scanning, don't enable power save */
230 if (local->scanning)
231 return TX_CONTINUE;
232
233 if (!local->ps_sdata)
234 return TX_CONTINUE;
235
236 /* No point if we're going to suspend */
237 if (local->quiescing)
238 return TX_CONTINUE;
239
240 /* dynamic ps is supported only in managed mode */
241 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
242 return TX_CONTINUE;
243
244 ifmgd = &tx->sdata->u.mgd;
245
246 /*
247 * Don't wakeup from power save if u-apsd is enabled, voip ac has
248 * u-apsd enabled and the frame is in voip class. This effectively
249 * means that even if all access categories have u-apsd enabled, in
250 * practise u-apsd is only used with the voip ac. This is a
251 * workaround for the case when received voip class packets do not
252 * have correct qos tag for some reason, due the network or the
253 * peer application.
254 *
255 * Note: ifmgd->uapsd_queues access is racy here. If the value is
256 * changed via debugfs, user needs to reassociate manually to have
257 * everything in sync.
258 */
259 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
260 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
261 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
262 return TX_CONTINUE;
263
264 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
265 ieee80211_stop_queues_by_reason(&local->hw,
266 IEEE80211_MAX_QUEUE_MAP,
267 IEEE80211_QUEUE_STOP_REASON_PS,
268 false);
269 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
270 ieee80211_queue_work(&local->hw,
271 &local->dynamic_ps_disable_work);
272 }
273
274 /* Don't restart the timer if we're not disassociated */
275 if (!ifmgd->associated)
276 return TX_CONTINUE;
277
278 mod_timer(&local->dynamic_ps_timer, jiffies +
279 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
280
281 return TX_CONTINUE;
282 }
283
284 static ieee80211_tx_result debug_noinline
285 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
286 {
287
288 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
289 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
290 bool assoc = false;
291
292 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
293 return TX_CONTINUE;
294
295 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
296 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
297 !ieee80211_is_probe_req(hdr->frame_control) &&
298 !ieee80211_is_nullfunc(hdr->frame_control))
299 /*
300 * When software scanning only nullfunc frames (to notify
301 * the sleep state to the AP) and probe requests (for the
302 * active scan) are allowed, all other frames should not be
303 * sent and we should not get here, but if we do
304 * nonetheless, drop them to avoid sending them
305 * off-channel. See the link below and
306 * ieee80211_start_scan() for more.
307 *
308 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
309 */
310 return TX_DROP;
311
312 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
313 return TX_CONTINUE;
314
315 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
316 return TX_CONTINUE;
317
318 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
319 return TX_CONTINUE;
320
321 if (tx->sta)
322 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
323
324 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
325 if (unlikely(!assoc &&
326 ieee80211_is_data(hdr->frame_control))) {
327 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
328 sdata_info(tx->sdata,
329 "dropped data frame to not associated station %pM\n",
330 hdr->addr1);
331 #endif
332 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
333 return TX_DROP;
334 }
335 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
336 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
337 /*
338 * No associated STAs - no need to send multicast
339 * frames.
340 */
341 return TX_DROP;
342 }
343
344 return TX_CONTINUE;
345 }
346
347 /* This function is called whenever the AP is about to exceed the maximum limit
348 * of buffered frames for power saving STAs. This situation should not really
349 * happen often during normal operation, so dropping the oldest buffered packet
350 * from each queue should be OK to make some room for new frames. */
351 static void purge_old_ps_buffers(struct ieee80211_local *local)
352 {
353 int total = 0, purged = 0;
354 struct sk_buff *skb;
355 struct ieee80211_sub_if_data *sdata;
356 struct sta_info *sta;
357
358 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
359 struct ps_data *ps;
360
361 if (sdata->vif.type == NL80211_IFTYPE_AP)
362 ps = &sdata->u.ap.ps;
363 else if (ieee80211_vif_is_mesh(&sdata->vif))
364 ps = &sdata->u.mesh.ps;
365 else
366 continue;
367
368 skb = skb_dequeue(&ps->bc_buf);
369 if (skb) {
370 purged++;
371 ieee80211_free_txskb(&local->hw, skb);
372 }
373 total += skb_queue_len(&ps->bc_buf);
374 }
375
376 /*
377 * Drop one frame from each station from the lowest-priority
378 * AC that has frames at all.
379 */
380 list_for_each_entry_rcu(sta, &local->sta_list, list) {
381 int ac;
382
383 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
384 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
385 total += skb_queue_len(&sta->ps_tx_buf[ac]);
386 if (skb) {
387 purged++;
388 ieee80211_free_txskb(&local->hw, skb);
389 break;
390 }
391 }
392 }
393
394 local->total_ps_buffered = total;
395 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
396 }
397
398 static ieee80211_tx_result
399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
400 {
401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
403 struct ps_data *ps;
404
405 /*
406 * broadcast/multicast frame
407 *
408 * If any of the associated/peer stations is in power save mode,
409 * the frame is buffered to be sent after DTIM beacon frame.
410 * This is done either by the hardware or us.
411 */
412
413 /* powersaving STAs currently only in AP/VLAN/mesh mode */
414 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
415 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
416 if (!tx->sdata->bss)
417 return TX_CONTINUE;
418
419 ps = &tx->sdata->bss->ps;
420 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
421 ps = &tx->sdata->u.mesh.ps;
422 } else {
423 return TX_CONTINUE;
424 }
425
426
427 /* no buffering for ordered frames */
428 if (ieee80211_has_order(hdr->frame_control))
429 return TX_CONTINUE;
430
431 if (ieee80211_is_probe_req(hdr->frame_control))
432 return TX_CONTINUE;
433
434 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
435 info->hw_queue = tx->sdata->vif.cab_queue;
436
437 /* no stations in PS mode */
438 if (!atomic_read(&ps->num_sta_ps))
439 return TX_CONTINUE;
440
441 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
442
443 /* device releases frame after DTIM beacon */
444 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
445 return TX_CONTINUE;
446
447 /* buffered in mac80211 */
448 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
449 purge_old_ps_buffers(tx->local);
450
451 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
452 ps_dbg(tx->sdata,
453 "BC TX buffer full - dropping the oldest frame\n");
454 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
455 } else
456 tx->local->total_ps_buffered++;
457
458 skb_queue_tail(&ps->bc_buf, tx->skb);
459
460 return TX_QUEUED;
461 }
462
463 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
464 struct sk_buff *skb)
465 {
466 if (!ieee80211_is_mgmt(fc))
467 return 0;
468
469 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
470 return 0;
471
472 if (!ieee80211_is_robust_mgmt_frame(skb))
473 return 0;
474
475 return 1;
476 }
477
478 static ieee80211_tx_result
479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
480 {
481 struct sta_info *sta = tx->sta;
482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
484 struct ieee80211_local *local = tx->local;
485
486 if (unlikely(!sta))
487 return TX_CONTINUE;
488
489 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
490 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
491 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
492 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
493 int ac = skb_get_queue_mapping(tx->skb);
494
495 if (ieee80211_is_mgmt(hdr->frame_control) &&
496 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
497 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
498 return TX_CONTINUE;
499 }
500
501 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
502 sta->sta.addr, sta->sta.aid, ac);
503 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
504 purge_old_ps_buffers(tx->local);
505
506 /* sync with ieee80211_sta_ps_deliver_wakeup */
507 spin_lock(&sta->ps_lock);
508 /*
509 * STA woke up the meantime and all the frames on ps_tx_buf have
510 * been queued to pending queue. No reordering can happen, go
511 * ahead and Tx the packet.
512 */
513 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
514 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
515 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
516 spin_unlock(&sta->ps_lock);
517 return TX_CONTINUE;
518 }
519
520 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
521 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
522 ps_dbg(tx->sdata,
523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
524 sta->sta.addr, ac);
525 ieee80211_free_txskb(&local->hw, old);
526 } else
527 tx->local->total_ps_buffered++;
528
529 info->control.jiffies = jiffies;
530 info->control.vif = &tx->sdata->vif;
531 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
532 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
533 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
534 spin_unlock(&sta->ps_lock);
535
536 if (!timer_pending(&local->sta_cleanup))
537 mod_timer(&local->sta_cleanup,
538 round_jiffies(jiffies +
539 STA_INFO_CLEANUP_INTERVAL));
540
541 /*
542 * We queued up some frames, so the TIM bit might
543 * need to be set, recalculate it.
544 */
545 sta_info_recalc_tim(sta);
546
547 return TX_QUEUED;
548 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
549 ps_dbg(tx->sdata,
550 "STA %pM in PS mode, but polling/in SP -> send frame\n",
551 sta->sta.addr);
552 }
553
554 return TX_CONTINUE;
555 }
556
557 static ieee80211_tx_result debug_noinline
558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
559 {
560 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
561 return TX_CONTINUE;
562
563 if (tx->flags & IEEE80211_TX_UNICAST)
564 return ieee80211_tx_h_unicast_ps_buf(tx);
565 else
566 return ieee80211_tx_h_multicast_ps_buf(tx);
567 }
568
569 static ieee80211_tx_result debug_noinline
570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
571 {
572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
573
574 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
575 if (tx->sdata->control_port_no_encrypt)
576 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
577 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
578 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
579 }
580
581 return TX_CONTINUE;
582 }
583
584 static ieee80211_tx_result debug_noinline
585 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
586 {
587 struct ieee80211_key *key;
588 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
589 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
590
591 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
592 tx->key = NULL;
593 else if (tx->sta &&
594 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
595 tx->key = key;
596 else if (ieee80211_is_group_privacy_action(tx->skb) &&
597 (key = rcu_dereference(tx->sdata->default_multicast_key)))
598 tx->key = key;
599 else if (ieee80211_is_mgmt(hdr->frame_control) &&
600 is_multicast_ether_addr(hdr->addr1) &&
601 ieee80211_is_robust_mgmt_frame(tx->skb) &&
602 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
603 tx->key = key;
604 else if (is_multicast_ether_addr(hdr->addr1) &&
605 (key = rcu_dereference(tx->sdata->default_multicast_key)))
606 tx->key = key;
607 else if (!is_multicast_ether_addr(hdr->addr1) &&
608 (key = rcu_dereference(tx->sdata->default_unicast_key)))
609 tx->key = key;
610 else
611 tx->key = NULL;
612
613 if (tx->key) {
614 bool skip_hw = false;
615
616 /* TODO: add threshold stuff again */
617
618 switch (tx->key->conf.cipher) {
619 case WLAN_CIPHER_SUITE_WEP40:
620 case WLAN_CIPHER_SUITE_WEP104:
621 case WLAN_CIPHER_SUITE_TKIP:
622 if (!ieee80211_is_data_present(hdr->frame_control))
623 tx->key = NULL;
624 break;
625 case WLAN_CIPHER_SUITE_CCMP:
626 case WLAN_CIPHER_SUITE_CCMP_256:
627 case WLAN_CIPHER_SUITE_GCMP:
628 case WLAN_CIPHER_SUITE_GCMP_256:
629 if (!ieee80211_is_data_present(hdr->frame_control) &&
630 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
631 tx->skb) &&
632 !ieee80211_is_group_privacy_action(tx->skb))
633 tx->key = NULL;
634 else
635 skip_hw = (tx->key->conf.flags &
636 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
637 ieee80211_is_mgmt(hdr->frame_control);
638 break;
639 case WLAN_CIPHER_SUITE_AES_CMAC:
640 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
641 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
643 if (!ieee80211_is_mgmt(hdr->frame_control))
644 tx->key = NULL;
645 break;
646 }
647
648 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
649 !ieee80211_is_deauth(hdr->frame_control)))
650 return TX_DROP;
651
652 if (!skip_hw && tx->key &&
653 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
654 info->control.hw_key = &tx->key->conf;
655 }
656
657 return TX_CONTINUE;
658 }
659
660 static ieee80211_tx_result debug_noinline
661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
662 {
663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
664 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
665 struct ieee80211_supported_band *sband;
666 u32 len;
667 struct ieee80211_tx_rate_control txrc;
668 struct ieee80211_sta_rates *ratetbl = NULL;
669 bool assoc = false;
670
671 memset(&txrc, 0, sizeof(txrc));
672
673 sband = tx->local->hw.wiphy->bands[info->band];
674
675 len = min_t(u32, tx->skb->len + FCS_LEN,
676 tx->local->hw.wiphy->frag_threshold);
677
678 /* set up the tx rate control struct we give the RC algo */
679 txrc.hw = &tx->local->hw;
680 txrc.sband = sband;
681 txrc.bss_conf = &tx->sdata->vif.bss_conf;
682 txrc.skb = tx->skb;
683 txrc.reported_rate.idx = -1;
684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
685
686 if (tx->sdata->rc_has_mcs_mask[info->band])
687 txrc.rate_idx_mcs_mask =
688 tx->sdata->rc_rateidx_mcs_mask[info->band];
689
690 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
691 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
692 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
693 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
694
695 /* set up RTS protection if desired */
696 if (len > tx->local->hw.wiphy->rts_threshold) {
697 txrc.rts = true;
698 }
699
700 info->control.use_rts = txrc.rts;
701 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
702
703 /*
704 * Use short preamble if the BSS can handle it, but not for
705 * management frames unless we know the receiver can handle
706 * that -- the management frame might be to a station that
707 * just wants a probe response.
708 */
709 if (tx->sdata->vif.bss_conf.use_short_preamble &&
710 (ieee80211_is_data(hdr->frame_control) ||
711 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
712 txrc.short_preamble = true;
713
714 info->control.short_preamble = txrc.short_preamble;
715
716 /* don't ask rate control when rate already injected via radiotap */
717 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
718 return TX_CONTINUE;
719
720 if (tx->sta)
721 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
722
723 /*
724 * Lets not bother rate control if we're associated and cannot
725 * talk to the sta. This should not happen.
726 */
727 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
728 !rate_usable_index_exists(sband, &tx->sta->sta),
729 "%s: Dropped data frame as no usable bitrate found while "
730 "scanning and associated. Target station: "
731 "%pM on %d GHz band\n",
732 tx->sdata->name, hdr->addr1,
733 info->band ? 5 : 2))
734 return TX_DROP;
735
736 /*
737 * If we're associated with the sta at this point we know we can at
738 * least send the frame at the lowest bit rate.
739 */
740 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
741
742 if (tx->sta && !info->control.skip_table)
743 ratetbl = rcu_dereference(tx->sta->sta.rates);
744
745 if (unlikely(info->control.rates[0].idx < 0)) {
746 if (ratetbl) {
747 struct ieee80211_tx_rate rate = {
748 .idx = ratetbl->rate[0].idx,
749 .flags = ratetbl->rate[0].flags,
750 .count = ratetbl->rate[0].count
751 };
752
753 if (ratetbl->rate[0].idx < 0)
754 return TX_DROP;
755
756 tx->rate = rate;
757 } else {
758 return TX_DROP;
759 }
760 } else {
761 tx->rate = info->control.rates[0];
762 }
763
764 if (txrc.reported_rate.idx < 0) {
765 txrc.reported_rate = tx->rate;
766 if (tx->sta && ieee80211_is_data(hdr->frame_control))
767 tx->sta->tx_stats.last_rate = txrc.reported_rate;
768 } else if (tx->sta)
769 tx->sta->tx_stats.last_rate = txrc.reported_rate;
770
771 if (ratetbl)
772 return TX_CONTINUE;
773
774 if (unlikely(!info->control.rates[0].count))
775 info->control.rates[0].count = 1;
776
777 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
778 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
779 info->control.rates[0].count = 1;
780
781 return TX_CONTINUE;
782 }
783
784 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
785 {
786 u16 *seq = &sta->tid_seq[tid];
787 __le16 ret = cpu_to_le16(*seq);
788
789 /* Increase the sequence number. */
790 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
791
792 return ret;
793 }
794
795 static ieee80211_tx_result debug_noinline
796 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
797 {
798 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
799 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
800 u8 *qc;
801 int tid;
802
803 /*
804 * Packet injection may want to control the sequence
805 * number, if we have no matching interface then we
806 * neither assign one ourselves nor ask the driver to.
807 */
808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
809 return TX_CONTINUE;
810
811 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
812 return TX_CONTINUE;
813
814 if (ieee80211_hdrlen(hdr->frame_control) < 24)
815 return TX_CONTINUE;
816
817 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
818 return TX_CONTINUE;
819
820 /*
821 * Anything but QoS data that has a sequence number field
822 * (is long enough) gets a sequence number from the global
823 * counter. QoS data frames with a multicast destination
824 * also use the global counter (802.11-2012 9.3.2.10).
825 */
826 if (!ieee80211_is_data_qos(hdr->frame_control) ||
827 is_multicast_ether_addr(hdr->addr1)) {
828 /* driver should assign sequence number */
829 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
830 /* for pure STA mode without beacons, we can do it */
831 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
832 tx->sdata->sequence_number += 0x10;
833 if (tx->sta)
834 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
835 return TX_CONTINUE;
836 }
837
838 /*
839 * This should be true for injected/management frames only, for
840 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
841 * above since they are not QoS-data frames.
842 */
843 if (!tx->sta)
844 return TX_CONTINUE;
845
846 /* include per-STA, per-TID sequence counter */
847
848 qc = ieee80211_get_qos_ctl(hdr);
849 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
850 tx->sta->tx_stats.msdu[tid]++;
851
852 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
853
854 return TX_CONTINUE;
855 }
856
857 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
858 struct sk_buff *skb, int hdrlen,
859 int frag_threshold)
860 {
861 struct ieee80211_local *local = tx->local;
862 struct ieee80211_tx_info *info;
863 struct sk_buff *tmp;
864 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
865 int pos = hdrlen + per_fragm;
866 int rem = skb->len - hdrlen - per_fragm;
867
868 if (WARN_ON(rem < 0))
869 return -EINVAL;
870
871 /* first fragment was already added to queue by caller */
872
873 while (rem) {
874 int fraglen = per_fragm;
875
876 if (fraglen > rem)
877 fraglen = rem;
878 rem -= fraglen;
879 tmp = dev_alloc_skb(local->tx_headroom +
880 frag_threshold +
881 tx->sdata->encrypt_headroom +
882 IEEE80211_ENCRYPT_TAILROOM);
883 if (!tmp)
884 return -ENOMEM;
885
886 __skb_queue_tail(&tx->skbs, tmp);
887
888 skb_reserve(tmp,
889 local->tx_headroom + tx->sdata->encrypt_headroom);
890
891 /* copy control information */
892 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
893
894 info = IEEE80211_SKB_CB(tmp);
895 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
896 IEEE80211_TX_CTL_FIRST_FRAGMENT);
897
898 if (rem)
899 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
900
901 skb_copy_queue_mapping(tmp, skb);
902 tmp->priority = skb->priority;
903 tmp->dev = skb->dev;
904
905 /* copy header and data */
906 skb_put_data(tmp, skb->data, hdrlen);
907 skb_put_data(tmp, skb->data + pos, fraglen);
908
909 pos += fraglen;
910 }
911
912 /* adjust first fragment's length */
913 skb_trim(skb, hdrlen + per_fragm);
914 return 0;
915 }
916
917 static ieee80211_tx_result debug_noinline
918 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
919 {
920 struct sk_buff *skb = tx->skb;
921 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
922 struct ieee80211_hdr *hdr = (void *)skb->data;
923 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
924 int hdrlen;
925 int fragnum;
926
927 /* no matter what happens, tx->skb moves to tx->skbs */
928 __skb_queue_tail(&tx->skbs, skb);
929 tx->skb = NULL;
930
931 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
932 return TX_CONTINUE;
933
934 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
935 return TX_CONTINUE;
936
937 /*
938 * Warn when submitting a fragmented A-MPDU frame and drop it.
939 * This scenario is handled in ieee80211_tx_prepare but extra
940 * caution taken here as fragmented ampdu may cause Tx stop.
941 */
942 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
943 return TX_DROP;
944
945 hdrlen = ieee80211_hdrlen(hdr->frame_control);
946
947 /* internal error, why isn't DONTFRAG set? */
948 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
949 return TX_DROP;
950
951 /*
952 * Now fragment the frame. This will allocate all the fragments and
953 * chain them (using skb as the first fragment) to skb->next.
954 * During transmission, we will remove the successfully transmitted
955 * fragments from this list. When the low-level driver rejects one
956 * of the fragments then we will simply pretend to accept the skb
957 * but store it away as pending.
958 */
959 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
960 return TX_DROP;
961
962 /* update duration/seq/flags of fragments */
963 fragnum = 0;
964
965 skb_queue_walk(&tx->skbs, skb) {
966 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
967
968 hdr = (void *)skb->data;
969 info = IEEE80211_SKB_CB(skb);
970
971 if (!skb_queue_is_last(&tx->skbs, skb)) {
972 hdr->frame_control |= morefrags;
973 /*
974 * No multi-rate retries for fragmented frames, that
975 * would completely throw off the NAV at other STAs.
976 */
977 info->control.rates[1].idx = -1;
978 info->control.rates[2].idx = -1;
979 info->control.rates[3].idx = -1;
980 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
981 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
982 } else {
983 hdr->frame_control &= ~morefrags;
984 }
985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
986 fragnum++;
987 }
988
989 return TX_CONTINUE;
990 }
991
992 static ieee80211_tx_result debug_noinline
993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
994 {
995 struct sk_buff *skb;
996 int ac = -1;
997
998 if (!tx->sta)
999 return TX_CONTINUE;
1000
1001 skb_queue_walk(&tx->skbs, skb) {
1002 ac = skb_get_queue_mapping(skb);
1003 tx->sta->tx_stats.bytes[ac] += skb->len;
1004 }
1005 if (ac >= 0)
1006 tx->sta->tx_stats.packets[ac]++;
1007
1008 return TX_CONTINUE;
1009 }
1010
1011 static ieee80211_tx_result debug_noinline
1012 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1013 {
1014 if (!tx->key)
1015 return TX_CONTINUE;
1016
1017 switch (tx->key->conf.cipher) {
1018 case WLAN_CIPHER_SUITE_WEP40:
1019 case WLAN_CIPHER_SUITE_WEP104:
1020 return ieee80211_crypto_wep_encrypt(tx);
1021 case WLAN_CIPHER_SUITE_TKIP:
1022 return ieee80211_crypto_tkip_encrypt(tx);
1023 case WLAN_CIPHER_SUITE_CCMP:
1024 return ieee80211_crypto_ccmp_encrypt(
1025 tx, IEEE80211_CCMP_MIC_LEN);
1026 case WLAN_CIPHER_SUITE_CCMP_256:
1027 return ieee80211_crypto_ccmp_encrypt(
1028 tx, IEEE80211_CCMP_256_MIC_LEN);
1029 case WLAN_CIPHER_SUITE_AES_CMAC:
1030 return ieee80211_crypto_aes_cmac_encrypt(tx);
1031 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1032 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1033 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1034 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1035 return ieee80211_crypto_aes_gmac_encrypt(tx);
1036 case WLAN_CIPHER_SUITE_GCMP:
1037 case WLAN_CIPHER_SUITE_GCMP_256:
1038 return ieee80211_crypto_gcmp_encrypt(tx);
1039 default:
1040 return ieee80211_crypto_hw_encrypt(tx);
1041 }
1042
1043 return TX_DROP;
1044 }
1045
1046 static ieee80211_tx_result debug_noinline
1047 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1048 {
1049 struct sk_buff *skb;
1050 struct ieee80211_hdr *hdr;
1051 int next_len;
1052 bool group_addr;
1053
1054 skb_queue_walk(&tx->skbs, skb) {
1055 hdr = (void *) skb->data;
1056 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1057 break; /* must not overwrite AID */
1058 if (!skb_queue_is_last(&tx->skbs, skb)) {
1059 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1060 next_len = next->len;
1061 } else
1062 next_len = 0;
1063 group_addr = is_multicast_ether_addr(hdr->addr1);
1064
1065 hdr->duration_id =
1066 ieee80211_duration(tx, skb, group_addr, next_len);
1067 }
1068
1069 return TX_CONTINUE;
1070 }
1071
1072 /* actual transmit path */
1073
1074 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1075 struct sk_buff *skb,
1076 struct ieee80211_tx_info *info,
1077 struct tid_ampdu_tx *tid_tx,
1078 int tid)
1079 {
1080 bool queued = false;
1081 bool reset_agg_timer = false;
1082 struct sk_buff *purge_skb = NULL;
1083
1084 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1085 info->flags |= IEEE80211_TX_CTL_AMPDU;
1086 reset_agg_timer = true;
1087 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1088 /*
1089 * nothing -- this aggregation session is being started
1090 * but that might still fail with the driver
1091 */
1092 } else if (!tx->sta->sta.txq[tid]) {
1093 spin_lock(&tx->sta->lock);
1094 /*
1095 * Need to re-check now, because we may get here
1096 *
1097 * 1) in the window during which the setup is actually
1098 * already done, but not marked yet because not all
1099 * packets are spliced over to the driver pending
1100 * queue yet -- if this happened we acquire the lock
1101 * either before or after the splice happens, but
1102 * need to recheck which of these cases happened.
1103 *
1104 * 2) during session teardown, if the OPERATIONAL bit
1105 * was cleared due to the teardown but the pointer
1106 * hasn't been assigned NULL yet (or we loaded it
1107 * before it was assigned) -- in this case it may
1108 * now be NULL which means we should just let the
1109 * packet pass through because splicing the frames
1110 * back is already done.
1111 */
1112 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1113
1114 if (!tid_tx) {
1115 /* do nothing, let packet pass through */
1116 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1117 info->flags |= IEEE80211_TX_CTL_AMPDU;
1118 reset_agg_timer = true;
1119 } else {
1120 queued = true;
1121 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1122 clear_sta_flag(tx->sta, WLAN_STA_SP);
1123 ps_dbg(tx->sta->sdata,
1124 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1125 tx->sta->sta.addr, tx->sta->sta.aid);
1126 }
1127 info->control.vif = &tx->sdata->vif;
1128 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1129 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1130 __skb_queue_tail(&tid_tx->pending, skb);
1131 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1132 purge_skb = __skb_dequeue(&tid_tx->pending);
1133 }
1134 spin_unlock(&tx->sta->lock);
1135
1136 if (purge_skb)
1137 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1138 }
1139
1140 /* reset session timer */
1141 if (reset_agg_timer && tid_tx->timeout)
1142 tid_tx->last_tx = jiffies;
1143
1144 return queued;
1145 }
1146
1147 /*
1148 * initialises @tx
1149 * pass %NULL for the station if unknown, a valid pointer if known
1150 * or an ERR_PTR() if the station is known not to exist
1151 */
1152 static ieee80211_tx_result
1153 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1154 struct ieee80211_tx_data *tx,
1155 struct sta_info *sta, struct sk_buff *skb)
1156 {
1157 struct ieee80211_local *local = sdata->local;
1158 struct ieee80211_hdr *hdr;
1159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1160 int tid;
1161 u8 *qc;
1162
1163 memset(tx, 0, sizeof(*tx));
1164 tx->skb = skb;
1165 tx->local = local;
1166 tx->sdata = sdata;
1167 __skb_queue_head_init(&tx->skbs);
1168
1169 /*
1170 * If this flag is set to true anywhere, and we get here,
1171 * we are doing the needed processing, so remove the flag
1172 * now.
1173 */
1174 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1175
1176 hdr = (struct ieee80211_hdr *) skb->data;
1177
1178 if (likely(sta)) {
1179 if (!IS_ERR(sta))
1180 tx->sta = sta;
1181 } else {
1182 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1183 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1184 if (!tx->sta && sdata->wdev.use_4addr)
1185 return TX_DROP;
1186 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1187 IEEE80211_TX_CTL_INJECTED) ||
1188 tx->sdata->control_port_protocol == tx->skb->protocol) {
1189 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1190 }
1191 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1192 tx->sta = sta_info_get(sdata, hdr->addr1);
1193 }
1194
1195 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1196 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1197 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1198 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1199 struct tid_ampdu_tx *tid_tx;
1200
1201 qc = ieee80211_get_qos_ctl(hdr);
1202 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1203
1204 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1205 if (tid_tx) {
1206 bool queued;
1207
1208 queued = ieee80211_tx_prep_agg(tx, skb, info,
1209 tid_tx, tid);
1210
1211 if (unlikely(queued))
1212 return TX_QUEUED;
1213 }
1214 }
1215
1216 if (is_multicast_ether_addr(hdr->addr1)) {
1217 tx->flags &= ~IEEE80211_TX_UNICAST;
1218 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1219 } else
1220 tx->flags |= IEEE80211_TX_UNICAST;
1221
1222 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1223 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1224 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1225 info->flags & IEEE80211_TX_CTL_AMPDU)
1226 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1227 }
1228
1229 if (!tx->sta)
1230 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1231 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1232 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1233 ieee80211_check_fast_xmit(tx->sta);
1234 }
1235
1236 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1237
1238 return TX_CONTINUE;
1239 }
1240
1241 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1242 struct ieee80211_vif *vif,
1243 struct sta_info *sta,
1244 struct sk_buff *skb)
1245 {
1246 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1247 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1248 struct ieee80211_txq *txq = NULL;
1249
1250 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1251 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1252 return NULL;
1253
1254 if (!ieee80211_is_data(hdr->frame_control))
1255 return NULL;
1256
1257 if (sta) {
1258 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1259
1260 if (!sta->uploaded)
1261 return NULL;
1262
1263 txq = sta->sta.txq[tid];
1264 } else if (vif) {
1265 txq = vif->txq;
1266 }
1267
1268 if (!txq)
1269 return NULL;
1270
1271 return to_txq_info(txq);
1272 }
1273
1274 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1275 {
1276 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1277 }
1278
1279 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi)
1280 {
1281 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif;
1282 }
1283
1284 static u32 codel_skb_len_func(const struct sk_buff *skb)
1285 {
1286 return skb->len;
1287 }
1288
1289 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1290 {
1291 const struct ieee80211_tx_info *info;
1292
1293 info = (const struct ieee80211_tx_info *)skb->cb;
1294 return info->control.enqueue_time;
1295 }
1296
1297 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1298 void *ctx)
1299 {
1300 struct ieee80211_local *local;
1301 struct txq_info *txqi;
1302 struct fq *fq;
1303 struct fq_flow *flow;
1304
1305 txqi = ctx;
1306 local = vif_to_sdata(txqi->txq.vif)->local;
1307 fq = &local->fq;
1308
1309 if (cvars == &txqi->def_cvars)
1310 flow = &txqi->def_flow;
1311 else
1312 flow = &fq->flows[cvars - local->cvars];
1313
1314 return fq_flow_dequeue(fq, flow);
1315 }
1316
1317 static void codel_drop_func(struct sk_buff *skb,
1318 void *ctx)
1319 {
1320 struct ieee80211_local *local;
1321 struct ieee80211_hw *hw;
1322 struct txq_info *txqi;
1323
1324 txqi = ctx;
1325 local = vif_to_sdata(txqi->txq.vif)->local;
1326 hw = &local->hw;
1327
1328 ieee80211_free_txskb(hw, skb);
1329 }
1330
1331 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1332 struct fq_tin *tin,
1333 struct fq_flow *flow)
1334 {
1335 struct ieee80211_local *local;
1336 struct txq_info *txqi;
1337 struct codel_vars *cvars;
1338 struct codel_params *cparams;
1339 struct codel_stats *cstats;
1340
1341 local = container_of(fq, struct ieee80211_local, fq);
1342 txqi = container_of(tin, struct txq_info, tin);
1343 cstats = &txqi->cstats;
1344
1345 if (txqi->txq.sta) {
1346 struct sta_info *sta = container_of(txqi->txq.sta,
1347 struct sta_info, sta);
1348 cparams = &sta->cparams;
1349 } else {
1350 cparams = &local->cparams;
1351 }
1352
1353 if (flow == &txqi->def_flow)
1354 cvars = &txqi->def_cvars;
1355 else
1356 cvars = &local->cvars[flow - fq->flows];
1357
1358 return codel_dequeue(txqi,
1359 &flow->backlog,
1360 cparams,
1361 cvars,
1362 cstats,
1363 codel_skb_len_func,
1364 codel_skb_time_func,
1365 codel_drop_func,
1366 codel_dequeue_func);
1367 }
1368
1369 static void fq_skb_free_func(struct fq *fq,
1370 struct fq_tin *tin,
1371 struct fq_flow *flow,
1372 struct sk_buff *skb)
1373 {
1374 struct ieee80211_local *local;
1375
1376 local = container_of(fq, struct ieee80211_local, fq);
1377 ieee80211_free_txskb(&local->hw, skb);
1378 }
1379
1380 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1381 struct fq_tin *tin,
1382 int idx,
1383 struct sk_buff *skb)
1384 {
1385 struct txq_info *txqi;
1386
1387 txqi = container_of(tin, struct txq_info, tin);
1388 return &txqi->def_flow;
1389 }
1390
1391 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1392 struct txq_info *txqi,
1393 struct sk_buff *skb)
1394 {
1395 struct fq *fq = &local->fq;
1396 struct fq_tin *tin = &txqi->tin;
1397
1398 ieee80211_set_skb_enqueue_time(skb);
1399 fq_tin_enqueue(fq, tin, skb,
1400 fq_skb_free_func,
1401 fq_flow_get_default_func);
1402 }
1403
1404 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1405 struct sta_info *sta,
1406 struct txq_info *txqi, int tid)
1407 {
1408 fq_tin_init(&txqi->tin);
1409 fq_flow_init(&txqi->def_flow);
1410 codel_vars_init(&txqi->def_cvars);
1411 codel_stats_init(&txqi->cstats);
1412 __skb_queue_head_init(&txqi->frags);
1413
1414 txqi->txq.vif = &sdata->vif;
1415
1416 if (sta) {
1417 txqi->txq.sta = &sta->sta;
1418 sta->sta.txq[tid] = &txqi->txq;
1419 txqi->txq.tid = tid;
1420 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1421 } else {
1422 sdata->vif.txq = &txqi->txq;
1423 txqi->txq.tid = 0;
1424 txqi->txq.ac = IEEE80211_AC_BE;
1425 }
1426 }
1427
1428 void ieee80211_txq_purge(struct ieee80211_local *local,
1429 struct txq_info *txqi)
1430 {
1431 struct fq *fq = &local->fq;
1432 struct fq_tin *tin = &txqi->tin;
1433
1434 fq_tin_reset(fq, tin, fq_skb_free_func);
1435 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1436 }
1437
1438 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1439 {
1440 struct fq *fq = &local->fq;
1441 int ret;
1442 int i;
1443 bool supp_vht = false;
1444 enum nl80211_band band;
1445
1446 if (!local->ops->wake_tx_queue)
1447 return 0;
1448
1449 ret = fq_init(fq, 4096);
1450 if (ret)
1451 return ret;
1452
1453 /*
1454 * If the hardware doesn't support VHT, it is safe to limit the maximum
1455 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1456 */
1457 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1458 struct ieee80211_supported_band *sband;
1459
1460 sband = local->hw.wiphy->bands[band];
1461 if (!sband)
1462 continue;
1463
1464 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1465 }
1466
1467 if (!supp_vht)
1468 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1469
1470 codel_params_init(&local->cparams);
1471 local->cparams.interval = MS2TIME(100);
1472 local->cparams.target = MS2TIME(20);
1473 local->cparams.ecn = true;
1474
1475 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1476 GFP_KERNEL);
1477 if (!local->cvars) {
1478 spin_lock_bh(&fq->lock);
1479 fq_reset(fq, fq_skb_free_func);
1480 spin_unlock_bh(&fq->lock);
1481 return -ENOMEM;
1482 }
1483
1484 for (i = 0; i < fq->flows_cnt; i++)
1485 codel_vars_init(&local->cvars[i]);
1486
1487 return 0;
1488 }
1489
1490 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1491 {
1492 struct fq *fq = &local->fq;
1493
1494 if (!local->ops->wake_tx_queue)
1495 return;
1496
1497 kfree(local->cvars);
1498 local->cvars = NULL;
1499
1500 spin_lock_bh(&fq->lock);
1501 fq_reset(fq, fq_skb_free_func);
1502 spin_unlock_bh(&fq->lock);
1503 }
1504
1505 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1506 struct ieee80211_sub_if_data *sdata,
1507 struct sta_info *sta,
1508 struct sk_buff *skb)
1509 {
1510 struct fq *fq = &local->fq;
1511 struct ieee80211_vif *vif;
1512 struct txq_info *txqi;
1513
1514 if (!local->ops->wake_tx_queue ||
1515 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1516 return false;
1517
1518 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1519 sdata = container_of(sdata->bss,
1520 struct ieee80211_sub_if_data, u.ap);
1521
1522 vif = &sdata->vif;
1523 txqi = ieee80211_get_txq(local, vif, sta, skb);
1524
1525 if (!txqi)
1526 return false;
1527
1528 spin_lock_bh(&fq->lock);
1529 ieee80211_txq_enqueue(local, txqi, skb);
1530 spin_unlock_bh(&fq->lock);
1531
1532 drv_wake_tx_queue(local, txqi);
1533
1534 return true;
1535 }
1536
1537 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1538 struct ieee80211_vif *vif,
1539 struct ieee80211_sta *sta,
1540 struct sk_buff_head *skbs,
1541 bool txpending)
1542 {
1543 struct ieee80211_tx_control control = {};
1544 struct sk_buff *skb, *tmp;
1545 unsigned long flags;
1546
1547 skb_queue_walk_safe(skbs, skb, tmp) {
1548 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1549 int q = info->hw_queue;
1550
1551 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1552 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1553 __skb_unlink(skb, skbs);
1554 ieee80211_free_txskb(&local->hw, skb);
1555 continue;
1556 }
1557 #endif
1558
1559 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1560 if (local->queue_stop_reasons[q] ||
1561 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1562 if (unlikely(info->flags &
1563 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1564 if (local->queue_stop_reasons[q] &
1565 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1566 /*
1567 * Drop off-channel frames if queues
1568 * are stopped for any reason other
1569 * than off-channel operation. Never
1570 * queue them.
1571 */
1572 spin_unlock_irqrestore(
1573 &local->queue_stop_reason_lock,
1574 flags);
1575 ieee80211_purge_tx_queue(&local->hw,
1576 skbs);
1577 return true;
1578 }
1579 } else {
1580
1581 /*
1582 * Since queue is stopped, queue up frames for
1583 * later transmission from the tx-pending
1584 * tasklet when the queue is woken again.
1585 */
1586 if (txpending)
1587 skb_queue_splice_init(skbs,
1588 &local->pending[q]);
1589 else
1590 skb_queue_splice_tail_init(skbs,
1591 &local->pending[q]);
1592
1593 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1594 flags);
1595 return false;
1596 }
1597 }
1598 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1599
1600 info->control.vif = vif;
1601 control.sta = sta;
1602
1603 __skb_unlink(skb, skbs);
1604 drv_tx(local, &control, skb);
1605 }
1606
1607 return true;
1608 }
1609
1610 /*
1611 * Returns false if the frame couldn't be transmitted but was queued instead.
1612 */
1613 static bool __ieee80211_tx(struct ieee80211_local *local,
1614 struct sk_buff_head *skbs, int led_len,
1615 struct sta_info *sta, bool txpending)
1616 {
1617 struct ieee80211_tx_info *info;
1618 struct ieee80211_sub_if_data *sdata;
1619 struct ieee80211_vif *vif;
1620 struct ieee80211_sta *pubsta;
1621 struct sk_buff *skb;
1622 bool result = true;
1623 __le16 fc;
1624
1625 if (WARN_ON(skb_queue_empty(skbs)))
1626 return true;
1627
1628 skb = skb_peek(skbs);
1629 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1630 info = IEEE80211_SKB_CB(skb);
1631 sdata = vif_to_sdata(info->control.vif);
1632 if (sta && !sta->uploaded)
1633 sta = NULL;
1634
1635 if (sta)
1636 pubsta = &sta->sta;
1637 else
1638 pubsta = NULL;
1639
1640 switch (sdata->vif.type) {
1641 case NL80211_IFTYPE_MONITOR:
1642 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1643 vif = &sdata->vif;
1644 break;
1645 }
1646 sdata = rcu_dereference(local->monitor_sdata);
1647 if (sdata) {
1648 vif = &sdata->vif;
1649 info->hw_queue =
1650 vif->hw_queue[skb_get_queue_mapping(skb)];
1651 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1652 ieee80211_purge_tx_queue(&local->hw, skbs);
1653 return true;
1654 } else
1655 vif = NULL;
1656 break;
1657 case NL80211_IFTYPE_AP_VLAN:
1658 sdata = container_of(sdata->bss,
1659 struct ieee80211_sub_if_data, u.ap);
1660 /* fall through */
1661 default:
1662 vif = &sdata->vif;
1663 break;
1664 }
1665
1666 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1667 txpending);
1668
1669 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1670
1671 WARN_ON_ONCE(!skb_queue_empty(skbs));
1672
1673 return result;
1674 }
1675
1676 /*
1677 * Invoke TX handlers, return 0 on success and non-zero if the
1678 * frame was dropped or queued.
1679 *
1680 * The handlers are split into an early and late part. The latter is everything
1681 * that can be sensitive to reordering, and will be deferred to after packets
1682 * are dequeued from the intermediate queues (when they are enabled).
1683 */
1684 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1685 {
1686 ieee80211_tx_result res = TX_DROP;
1687
1688 #define CALL_TXH(txh) \
1689 do { \
1690 res = txh(tx); \
1691 if (res != TX_CONTINUE) \
1692 goto txh_done; \
1693 } while (0)
1694
1695 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1696 CALL_TXH(ieee80211_tx_h_check_assoc);
1697 CALL_TXH(ieee80211_tx_h_ps_buf);
1698 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1699 CALL_TXH(ieee80211_tx_h_select_key);
1700 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1701 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1702
1703 txh_done:
1704 if (unlikely(res == TX_DROP)) {
1705 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1706 if (tx->skb)
1707 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1708 else
1709 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1710 return -1;
1711 } else if (unlikely(res == TX_QUEUED)) {
1712 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1713 return -1;
1714 }
1715
1716 return 0;
1717 }
1718
1719 /*
1720 * Late handlers can be called while the sta lock is held. Handlers that can
1721 * cause packets to be generated will cause deadlock!
1722 */
1723 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1724 {
1725 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1726 ieee80211_tx_result res = TX_CONTINUE;
1727
1728 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1729 __skb_queue_tail(&tx->skbs, tx->skb);
1730 tx->skb = NULL;
1731 goto txh_done;
1732 }
1733
1734 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1735 CALL_TXH(ieee80211_tx_h_sequence);
1736 CALL_TXH(ieee80211_tx_h_fragment);
1737 /* handlers after fragment must be aware of tx info fragmentation! */
1738 CALL_TXH(ieee80211_tx_h_stats);
1739 CALL_TXH(ieee80211_tx_h_encrypt);
1740 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1741 CALL_TXH(ieee80211_tx_h_calculate_duration);
1742 #undef CALL_TXH
1743
1744 txh_done:
1745 if (unlikely(res == TX_DROP)) {
1746 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1747 if (tx->skb)
1748 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1749 else
1750 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1751 return -1;
1752 } else if (unlikely(res == TX_QUEUED)) {
1753 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1754 return -1;
1755 }
1756
1757 return 0;
1758 }
1759
1760 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1761 {
1762 int r = invoke_tx_handlers_early(tx);
1763
1764 if (r)
1765 return r;
1766 return invoke_tx_handlers_late(tx);
1767 }
1768
1769 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1770 struct ieee80211_vif *vif, struct sk_buff *skb,
1771 int band, struct ieee80211_sta **sta)
1772 {
1773 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1774 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1775 struct ieee80211_tx_data tx;
1776 struct sk_buff *skb2;
1777
1778 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1779 return false;
1780
1781 info->band = band;
1782 info->control.vif = vif;
1783 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1784
1785 if (invoke_tx_handlers(&tx))
1786 return false;
1787
1788 if (sta) {
1789 if (tx.sta)
1790 *sta = &tx.sta->sta;
1791 else
1792 *sta = NULL;
1793 }
1794
1795 /* this function isn't suitable for fragmented data frames */
1796 skb2 = __skb_dequeue(&tx.skbs);
1797 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1798 ieee80211_free_txskb(hw, skb2);
1799 ieee80211_purge_tx_queue(hw, &tx.skbs);
1800 return false;
1801 }
1802
1803 return true;
1804 }
1805 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1806
1807 /*
1808 * Returns false if the frame couldn't be transmitted but was queued instead.
1809 */
1810 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1811 struct sta_info *sta, struct sk_buff *skb,
1812 bool txpending)
1813 {
1814 struct ieee80211_local *local = sdata->local;
1815 struct ieee80211_tx_data tx;
1816 ieee80211_tx_result res_prepare;
1817 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1818 bool result = true;
1819 int led_len;
1820
1821 if (unlikely(skb->len < 10)) {
1822 dev_kfree_skb(skb);
1823 return true;
1824 }
1825
1826 /* initialises tx */
1827 led_len = skb->len;
1828 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1829
1830 if (unlikely(res_prepare == TX_DROP)) {
1831 ieee80211_free_txskb(&local->hw, skb);
1832 return true;
1833 } else if (unlikely(res_prepare == TX_QUEUED)) {
1834 return true;
1835 }
1836
1837 /* set up hw_queue value early */
1838 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1839 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1840 info->hw_queue =
1841 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1842
1843 if (invoke_tx_handlers_early(&tx))
1844 return false;
1845
1846 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1847 return true;
1848
1849 if (!invoke_tx_handlers_late(&tx))
1850 result = __ieee80211_tx(local, &tx.skbs, led_len,
1851 tx.sta, txpending);
1852
1853 return result;
1854 }
1855
1856 /* device xmit handlers */
1857
1858 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1859 struct sk_buff *skb,
1860 int head_need, bool may_encrypt)
1861 {
1862 struct ieee80211_local *local = sdata->local;
1863 int tail_need = 0;
1864
1865 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1866 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1867 tail_need -= skb_tailroom(skb);
1868 tail_need = max_t(int, tail_need, 0);
1869 }
1870
1871 if (skb_cloned(skb) &&
1872 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1873 !skb_clone_writable(skb, ETH_HLEN) ||
1874 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1875 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1876 else if (head_need || tail_need)
1877 I802_DEBUG_INC(local->tx_expand_skb_head);
1878 else
1879 return 0;
1880
1881 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1882 wiphy_debug(local->hw.wiphy,
1883 "failed to reallocate TX buffer\n");
1884 return -ENOMEM;
1885 }
1886
1887 return 0;
1888 }
1889
1890 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1891 struct sta_info *sta, struct sk_buff *skb)
1892 {
1893 struct ieee80211_local *local = sdata->local;
1894 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1895 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1896 int headroom;
1897 bool may_encrypt;
1898
1899 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1900
1901 headroom = local->tx_headroom;
1902 if (may_encrypt)
1903 headroom += sdata->encrypt_headroom;
1904 headroom -= skb_headroom(skb);
1905 headroom = max_t(int, 0, headroom);
1906
1907 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1908 ieee80211_free_txskb(&local->hw, skb);
1909 return;
1910 }
1911
1912 hdr = (struct ieee80211_hdr *) skb->data;
1913 info->control.vif = &sdata->vif;
1914
1915 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1916 if (ieee80211_is_data(hdr->frame_control) &&
1917 is_unicast_ether_addr(hdr->addr1)) {
1918 if (mesh_nexthop_resolve(sdata, skb))
1919 return; /* skb queued: don't free */
1920 } else {
1921 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1922 }
1923 }
1924
1925 ieee80211_set_qos_hdr(sdata, skb);
1926 ieee80211_tx(sdata, sta, skb, false);
1927 }
1928
1929 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1930 struct sk_buff *skb)
1931 {
1932 struct ieee80211_radiotap_iterator iterator;
1933 struct ieee80211_radiotap_header *rthdr =
1934 (struct ieee80211_radiotap_header *) skb->data;
1935 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1936 struct ieee80211_supported_band *sband =
1937 local->hw.wiphy->bands[info->band];
1938 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1939 NULL);
1940 u16 txflags;
1941 u16 rate = 0;
1942 bool rate_found = false;
1943 u8 rate_retries = 0;
1944 u16 rate_flags = 0;
1945 u8 mcs_known, mcs_flags, mcs_bw;
1946 u16 vht_known;
1947 u8 vht_mcs = 0, vht_nss = 0;
1948 int i;
1949
1950 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1951 IEEE80211_TX_CTL_DONTFRAG;
1952
1953 /*
1954 * for every radiotap entry that is present
1955 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1956 * entries present, or -EINVAL on error)
1957 */
1958
1959 while (!ret) {
1960 ret = ieee80211_radiotap_iterator_next(&iterator);
1961
1962 if (ret)
1963 continue;
1964
1965 /* see if this argument is something we can use */
1966 switch (iterator.this_arg_index) {
1967 /*
1968 * You must take care when dereferencing iterator.this_arg
1969 * for multibyte types... the pointer is not aligned. Use
1970 * get_unaligned((type *)iterator.this_arg) to dereference
1971 * iterator.this_arg for type "type" safely on all arches.
1972 */
1973 case IEEE80211_RADIOTAP_FLAGS:
1974 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1975 /*
1976 * this indicates that the skb we have been
1977 * handed has the 32-bit FCS CRC at the end...
1978 * we should react to that by snipping it off
1979 * because it will be recomputed and added
1980 * on transmission
1981 */
1982 if (skb->len < (iterator._max_length + FCS_LEN))
1983 return false;
1984
1985 skb_trim(skb, skb->len - FCS_LEN);
1986 }
1987 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1988 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1989 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1990 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1991 break;
1992
1993 case IEEE80211_RADIOTAP_TX_FLAGS:
1994 txflags = get_unaligned_le16(iterator.this_arg);
1995 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1996 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1997 break;
1998
1999 case IEEE80211_RADIOTAP_RATE:
2000 rate = *iterator.this_arg;
2001 rate_flags = 0;
2002 rate_found = true;
2003 break;
2004
2005 case IEEE80211_RADIOTAP_DATA_RETRIES:
2006 rate_retries = *iterator.this_arg;
2007 break;
2008
2009 case IEEE80211_RADIOTAP_MCS:
2010 mcs_known = iterator.this_arg[0];
2011 mcs_flags = iterator.this_arg[1];
2012 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2013 break;
2014
2015 rate_found = true;
2016 rate = iterator.this_arg[2];
2017 rate_flags = IEEE80211_TX_RC_MCS;
2018
2019 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2020 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2021 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2022
2023 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2024 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2025 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2026 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2027 break;
2028
2029 case IEEE80211_RADIOTAP_VHT:
2030 vht_known = get_unaligned_le16(iterator.this_arg);
2031 rate_found = true;
2032
2033 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2034 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2035 (iterator.this_arg[2] &
2036 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2037 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2038 if (vht_known &
2039 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2040 if (iterator.this_arg[3] == 1)
2041 rate_flags |=
2042 IEEE80211_TX_RC_40_MHZ_WIDTH;
2043 else if (iterator.this_arg[3] == 4)
2044 rate_flags |=
2045 IEEE80211_TX_RC_80_MHZ_WIDTH;
2046 else if (iterator.this_arg[3] == 11)
2047 rate_flags |=
2048 IEEE80211_TX_RC_160_MHZ_WIDTH;
2049 }
2050
2051 vht_mcs = iterator.this_arg[4] >> 4;
2052 vht_nss = iterator.this_arg[4] & 0xF;
2053 break;
2054
2055 /*
2056 * Please update the file
2057 * Documentation/networking/mac80211-injection.txt
2058 * when parsing new fields here.
2059 */
2060
2061 default:
2062 break;
2063 }
2064 }
2065
2066 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2067 return false;
2068
2069 if (rate_found) {
2070 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2071
2072 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2073 info->control.rates[i].idx = -1;
2074 info->control.rates[i].flags = 0;
2075 info->control.rates[i].count = 0;
2076 }
2077
2078 if (rate_flags & IEEE80211_TX_RC_MCS) {
2079 info->control.rates[0].idx = rate;
2080 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2081 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2082 vht_nss);
2083 } else {
2084 for (i = 0; i < sband->n_bitrates; i++) {
2085 if (rate * 5 != sband->bitrates[i].bitrate)
2086 continue;
2087
2088 info->control.rates[0].idx = i;
2089 break;
2090 }
2091 }
2092
2093 if (info->control.rates[0].idx < 0)
2094 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2095
2096 info->control.rates[0].flags = rate_flags;
2097 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2098 local->hw.max_rate_tries);
2099 }
2100
2101 /*
2102 * remove the radiotap header
2103 * iterator->_max_length was sanity-checked against
2104 * skb->len by iterator init
2105 */
2106 skb_pull(skb, iterator._max_length);
2107
2108 return true;
2109 }
2110
2111 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2112 struct net_device *dev)
2113 {
2114 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2115 struct ieee80211_chanctx_conf *chanctx_conf;
2116 struct ieee80211_radiotap_header *prthdr =
2117 (struct ieee80211_radiotap_header *)skb->data;
2118 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2119 struct ieee80211_hdr *hdr;
2120 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2121 struct cfg80211_chan_def *chandef;
2122 u16 len_rthdr;
2123 int hdrlen;
2124
2125 /* check for not even having the fixed radiotap header part */
2126 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2127 goto fail; /* too short to be possibly valid */
2128
2129 /* is it a header version we can trust to find length from? */
2130 if (unlikely(prthdr->it_version))
2131 goto fail; /* only version 0 is supported */
2132
2133 /* then there must be a radiotap header with a length we can use */
2134 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2135
2136 /* does the skb contain enough to deliver on the alleged length? */
2137 if (unlikely(skb->len < len_rthdr))
2138 goto fail; /* skb too short for claimed rt header extent */
2139
2140 /*
2141 * fix up the pointers accounting for the radiotap
2142 * header still being in there. We are being given
2143 * a precooked IEEE80211 header so no need for
2144 * normal processing
2145 */
2146 skb_set_mac_header(skb, len_rthdr);
2147 /*
2148 * these are just fixed to the end of the rt area since we
2149 * don't have any better information and at this point, nobody cares
2150 */
2151 skb_set_network_header(skb, len_rthdr);
2152 skb_set_transport_header(skb, len_rthdr);
2153
2154 if (skb->len < len_rthdr + 2)
2155 goto fail;
2156
2157 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2158 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2159
2160 if (skb->len < len_rthdr + hdrlen)
2161 goto fail;
2162
2163 /*
2164 * Initialize skb->protocol if the injected frame is a data frame
2165 * carrying a rfc1042 header
2166 */
2167 if (ieee80211_is_data(hdr->frame_control) &&
2168 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2169 u8 *payload = (u8 *)hdr + hdrlen;
2170
2171 if (ether_addr_equal(payload, rfc1042_header))
2172 skb->protocol = cpu_to_be16((payload[6] << 8) |
2173 payload[7]);
2174 }
2175
2176 memset(info, 0, sizeof(*info));
2177
2178 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2179 IEEE80211_TX_CTL_INJECTED;
2180
2181 rcu_read_lock();
2182
2183 /*
2184 * We process outgoing injected frames that have a local address
2185 * we handle as though they are non-injected frames.
2186 * This code here isn't entirely correct, the local MAC address
2187 * isn't always enough to find the interface to use; for proper
2188 * VLAN/WDS support we will need a different mechanism (which
2189 * likely isn't going to be monitor interfaces).
2190 */
2191 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2192
2193 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2194 if (!ieee80211_sdata_running(tmp_sdata))
2195 continue;
2196 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2197 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2198 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2199 continue;
2200 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2201 sdata = tmp_sdata;
2202 break;
2203 }
2204 }
2205
2206 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2207 if (!chanctx_conf) {
2208 tmp_sdata = rcu_dereference(local->monitor_sdata);
2209 if (tmp_sdata)
2210 chanctx_conf =
2211 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2212 }
2213
2214 if (chanctx_conf)
2215 chandef = &chanctx_conf->def;
2216 else if (!local->use_chanctx)
2217 chandef = &local->_oper_chandef;
2218 else
2219 goto fail_rcu;
2220
2221 /*
2222 * Frame injection is not allowed if beaconing is not allowed
2223 * or if we need radar detection. Beaconing is usually not allowed when
2224 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2225 * Passive scan is also used in world regulatory domains where
2226 * your country is not known and as such it should be treated as
2227 * NO TX unless the channel is explicitly allowed in which case
2228 * your current regulatory domain would not have the passive scan
2229 * flag.
2230 *
2231 * Since AP mode uses monitor interfaces to inject/TX management
2232 * frames we can make AP mode the exception to this rule once it
2233 * supports radar detection as its implementation can deal with
2234 * radar detection by itself. We can do that later by adding a
2235 * monitor flag interfaces used for AP support.
2236 */
2237 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2238 sdata->vif.type))
2239 goto fail_rcu;
2240
2241 info->band = chandef->chan->band;
2242
2243 /* process and remove the injection radiotap header */
2244 if (!ieee80211_parse_tx_radiotap(local, skb))
2245 goto fail_rcu;
2246
2247 ieee80211_xmit(sdata, NULL, skb);
2248 rcu_read_unlock();
2249
2250 return NETDEV_TX_OK;
2251
2252 fail_rcu:
2253 rcu_read_unlock();
2254 fail:
2255 dev_kfree_skb(skb);
2256 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2257 }
2258
2259 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2260 {
2261 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2262
2263 return ethertype == ETH_P_TDLS &&
2264 skb->len > 14 &&
2265 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2266 }
2267
2268 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2269 struct sk_buff *skb,
2270 struct sta_info **sta_out)
2271 {
2272 struct sta_info *sta;
2273
2274 switch (sdata->vif.type) {
2275 case NL80211_IFTYPE_AP_VLAN:
2276 sta = rcu_dereference(sdata->u.vlan.sta);
2277 if (sta) {
2278 *sta_out = sta;
2279 return 0;
2280 } else if (sdata->wdev.use_4addr) {
2281 return -ENOLINK;
2282 }
2283 /* fall through */
2284 case NL80211_IFTYPE_AP:
2285 case NL80211_IFTYPE_OCB:
2286 case NL80211_IFTYPE_ADHOC:
2287 if (is_multicast_ether_addr(skb->data)) {
2288 *sta_out = ERR_PTR(-ENOENT);
2289 return 0;
2290 }
2291 sta = sta_info_get_bss(sdata, skb->data);
2292 break;
2293 case NL80211_IFTYPE_WDS:
2294 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2295 break;
2296 #ifdef CONFIG_MAC80211_MESH
2297 case NL80211_IFTYPE_MESH_POINT:
2298 /* determined much later */
2299 *sta_out = NULL;
2300 return 0;
2301 #endif
2302 case NL80211_IFTYPE_STATION:
2303 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2304 sta = sta_info_get(sdata, skb->data);
2305 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2306 if (test_sta_flag(sta,
2307 WLAN_STA_TDLS_PEER_AUTH)) {
2308 *sta_out = sta;
2309 return 0;
2310 }
2311
2312 /*
2313 * TDLS link during setup - throw out frames to
2314 * peer. Allow TDLS-setup frames to unauthorized
2315 * peers for the special case of a link teardown
2316 * after a TDLS sta is removed due to being
2317 * unreachable.
2318 */
2319 if (!ieee80211_is_tdls_setup(skb))
2320 return -EINVAL;
2321 }
2322
2323 }
2324
2325 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2326 if (!sta)
2327 return -ENOLINK;
2328 break;
2329 default:
2330 return -EINVAL;
2331 }
2332
2333 *sta_out = sta ?: ERR_PTR(-ENOENT);
2334 return 0;
2335 }
2336
2337 /**
2338 * ieee80211_build_hdr - build 802.11 header in the given frame
2339 * @sdata: virtual interface to build the header for
2340 * @skb: the skb to build the header in
2341 * @info_flags: skb flags to set
2342 *
2343 * This function takes the skb with 802.3 header and reformats the header to
2344 * the appropriate IEEE 802.11 header based on which interface the packet is
2345 * being transmitted on.
2346 *
2347 * Note that this function also takes care of the TX status request and
2348 * potential unsharing of the SKB - this needs to be interleaved with the
2349 * header building.
2350 *
2351 * The function requires the read-side RCU lock held
2352 *
2353 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2354 */
2355 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2356 struct sk_buff *skb, u32 info_flags,
2357 struct sta_info *sta)
2358 {
2359 struct ieee80211_local *local = sdata->local;
2360 struct ieee80211_tx_info *info;
2361 int head_need;
2362 u16 ethertype, hdrlen, meshhdrlen = 0;
2363 __le16 fc;
2364 struct ieee80211_hdr hdr;
2365 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2366 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2367 const u8 *encaps_data;
2368 int encaps_len, skip_header_bytes;
2369 bool wme_sta = false, authorized = false;
2370 bool tdls_peer;
2371 bool multicast;
2372 u16 info_id = 0;
2373 struct ieee80211_chanctx_conf *chanctx_conf;
2374 struct ieee80211_sub_if_data *ap_sdata;
2375 enum nl80211_band band;
2376 int ret;
2377
2378 if (IS_ERR(sta))
2379 sta = NULL;
2380
2381 /* convert Ethernet header to proper 802.11 header (based on
2382 * operation mode) */
2383 ethertype = (skb->data[12] << 8) | skb->data[13];
2384 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2385
2386 switch (sdata->vif.type) {
2387 case NL80211_IFTYPE_AP_VLAN:
2388 if (sdata->wdev.use_4addr) {
2389 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2390 /* RA TA DA SA */
2391 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2392 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2393 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2394 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2395 hdrlen = 30;
2396 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2397 wme_sta = sta->sta.wme;
2398 }
2399 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2400 u.ap);
2401 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2402 if (!chanctx_conf) {
2403 ret = -ENOTCONN;
2404 goto free;
2405 }
2406 band = chanctx_conf->def.chan->band;
2407 if (sdata->wdev.use_4addr)
2408 break;
2409 /* fall through */
2410 case NL80211_IFTYPE_AP:
2411 if (sdata->vif.type == NL80211_IFTYPE_AP)
2412 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2413 if (!chanctx_conf) {
2414 ret = -ENOTCONN;
2415 goto free;
2416 }
2417 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2418 /* DA BSSID SA */
2419 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2420 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2421 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2422 hdrlen = 24;
2423 band = chanctx_conf->def.chan->band;
2424 break;
2425 case NL80211_IFTYPE_WDS:
2426 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2427 /* RA TA DA SA */
2428 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2429 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2430 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2431 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2432 hdrlen = 30;
2433 /*
2434 * This is the exception! WDS style interfaces are prohibited
2435 * when channel contexts are in used so this must be valid
2436 */
2437 band = local->hw.conf.chandef.chan->band;
2438 break;
2439 #ifdef CONFIG_MAC80211_MESH
2440 case NL80211_IFTYPE_MESH_POINT:
2441 if (!is_multicast_ether_addr(skb->data)) {
2442 struct sta_info *next_hop;
2443 bool mpp_lookup = true;
2444
2445 mpath = mesh_path_lookup(sdata, skb->data);
2446 if (mpath) {
2447 mpp_lookup = false;
2448 next_hop = rcu_dereference(mpath->next_hop);
2449 if (!next_hop ||
2450 !(mpath->flags & (MESH_PATH_ACTIVE |
2451 MESH_PATH_RESOLVING)))
2452 mpp_lookup = true;
2453 }
2454
2455 if (mpp_lookup) {
2456 mppath = mpp_path_lookup(sdata, skb->data);
2457 if (mppath)
2458 mppath->exp_time = jiffies;
2459 }
2460
2461 if (mppath && mpath)
2462 mesh_path_del(sdata, mpath->dst);
2463 }
2464
2465 /*
2466 * Use address extension if it is a packet from
2467 * another interface or if we know the destination
2468 * is being proxied by a portal (i.e. portal address
2469 * differs from proxied address)
2470 */
2471 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2472 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2473 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2474 skb->data, skb->data + ETH_ALEN);
2475 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2476 NULL, NULL);
2477 } else {
2478 /* DS -> MBSS (802.11-2012 13.11.3.3).
2479 * For unicast with unknown forwarding information,
2480 * destination might be in the MBSS or if that fails
2481 * forwarded to another mesh gate. In either case
2482 * resolution will be handled in ieee80211_xmit(), so
2483 * leave the original DA. This also works for mcast */
2484 const u8 *mesh_da = skb->data;
2485
2486 if (mppath)
2487 mesh_da = mppath->mpp;
2488 else if (mpath)
2489 mesh_da = mpath->dst;
2490
2491 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2492 mesh_da, sdata->vif.addr);
2493 if (is_multicast_ether_addr(mesh_da))
2494 /* DA TA mSA AE:SA */
2495 meshhdrlen = ieee80211_new_mesh_header(
2496 sdata, &mesh_hdr,
2497 skb->data + ETH_ALEN, NULL);
2498 else
2499 /* RA TA mDA mSA AE:DA SA */
2500 meshhdrlen = ieee80211_new_mesh_header(
2501 sdata, &mesh_hdr, skb->data,
2502 skb->data + ETH_ALEN);
2503
2504 }
2505 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2506 if (!chanctx_conf) {
2507 ret = -ENOTCONN;
2508 goto free;
2509 }
2510 band = chanctx_conf->def.chan->band;
2511 break;
2512 #endif
2513 case NL80211_IFTYPE_STATION:
2514 /* we already did checks when looking up the RA STA */
2515 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2516
2517 if (tdls_peer) {
2518 /* DA SA BSSID */
2519 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2520 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2521 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2522 hdrlen = 24;
2523 } else if (sdata->u.mgd.use_4addr &&
2524 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2525 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2526 IEEE80211_FCTL_TODS);
2527 /* RA TA DA SA */
2528 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2529 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2530 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2531 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2532 hdrlen = 30;
2533 } else {
2534 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2535 /* BSSID SA DA */
2536 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2537 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2538 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2539 hdrlen = 24;
2540 }
2541 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2542 if (!chanctx_conf) {
2543 ret = -ENOTCONN;
2544 goto free;
2545 }
2546 band = chanctx_conf->def.chan->band;
2547 break;
2548 case NL80211_IFTYPE_OCB:
2549 /* DA SA BSSID */
2550 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2551 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2552 eth_broadcast_addr(hdr.addr3);
2553 hdrlen = 24;
2554 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2555 if (!chanctx_conf) {
2556 ret = -ENOTCONN;
2557 goto free;
2558 }
2559 band = chanctx_conf->def.chan->band;
2560 break;
2561 case NL80211_IFTYPE_ADHOC:
2562 /* DA SA BSSID */
2563 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2564 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2565 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2566 hdrlen = 24;
2567 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2568 if (!chanctx_conf) {
2569 ret = -ENOTCONN;
2570 goto free;
2571 }
2572 band = chanctx_conf->def.chan->band;
2573 break;
2574 default:
2575 ret = -EINVAL;
2576 goto free;
2577 }
2578
2579 multicast = is_multicast_ether_addr(hdr.addr1);
2580
2581 /* sta is always NULL for mesh */
2582 if (sta) {
2583 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2584 wme_sta = sta->sta.wme;
2585 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2586 /* For mesh, the use of the QoS header is mandatory */
2587 wme_sta = true;
2588 }
2589
2590 /* receiver does QoS (which also means we do) use it */
2591 if (wme_sta) {
2592 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2593 hdrlen += 2;
2594 }
2595
2596 /*
2597 * Drop unicast frames to unauthorised stations unless they are
2598 * EAPOL frames from the local station.
2599 */
2600 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2601 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2602 !multicast && !authorized &&
2603 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2604 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2605 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2606 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2607 sdata->name, hdr.addr1);
2608 #endif
2609
2610 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2611
2612 ret = -EPERM;
2613 goto free;
2614 }
2615
2616 if (unlikely(!multicast && skb->sk &&
2617 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2618 struct sk_buff *ack_skb = skb_clone_sk(skb);
2619
2620 if (ack_skb) {
2621 unsigned long flags;
2622 int id;
2623
2624 spin_lock_irqsave(&local->ack_status_lock, flags);
2625 id = idr_alloc(&local->ack_status_frames, ack_skb,
2626 1, 0x10000, GFP_ATOMIC);
2627 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2628
2629 if (id >= 0) {
2630 info_id = id;
2631 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2632 } else {
2633 kfree_skb(ack_skb);
2634 }
2635 }
2636 }
2637
2638 /*
2639 * If the skb is shared we need to obtain our own copy.
2640 */
2641 if (skb_shared(skb)) {
2642 struct sk_buff *tmp_skb = skb;
2643
2644 /* can't happen -- skb is a clone if info_id != 0 */
2645 WARN_ON(info_id);
2646
2647 skb = skb_clone(skb, GFP_ATOMIC);
2648 kfree_skb(tmp_skb);
2649
2650 if (!skb) {
2651 ret = -ENOMEM;
2652 goto free;
2653 }
2654 }
2655
2656 hdr.frame_control = fc;
2657 hdr.duration_id = 0;
2658 hdr.seq_ctrl = 0;
2659
2660 skip_header_bytes = ETH_HLEN;
2661 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2662 encaps_data = bridge_tunnel_header;
2663 encaps_len = sizeof(bridge_tunnel_header);
2664 skip_header_bytes -= 2;
2665 } else if (ethertype >= ETH_P_802_3_MIN) {
2666 encaps_data = rfc1042_header;
2667 encaps_len = sizeof(rfc1042_header);
2668 skip_header_bytes -= 2;
2669 } else {
2670 encaps_data = NULL;
2671 encaps_len = 0;
2672 }
2673
2674 skb_pull(skb, skip_header_bytes);
2675 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2676
2677 /*
2678 * So we need to modify the skb header and hence need a copy of
2679 * that. The head_need variable above doesn't, so far, include
2680 * the needed header space that we don't need right away. If we
2681 * can, then we don't reallocate right now but only after the
2682 * frame arrives at the master device (if it does...)
2683 *
2684 * If we cannot, however, then we will reallocate to include all
2685 * the ever needed space. Also, if we need to reallocate it anyway,
2686 * make it big enough for everything we may ever need.
2687 */
2688
2689 if (head_need > 0 || skb_cloned(skb)) {
2690 head_need += sdata->encrypt_headroom;
2691 head_need += local->tx_headroom;
2692 head_need = max_t(int, 0, head_need);
2693 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2694 ieee80211_free_txskb(&local->hw, skb);
2695 skb = NULL;
2696 return ERR_PTR(-ENOMEM);
2697 }
2698 }
2699
2700 if (encaps_data)
2701 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2702
2703 #ifdef CONFIG_MAC80211_MESH
2704 if (meshhdrlen > 0)
2705 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2706 #endif
2707
2708 if (ieee80211_is_data_qos(fc)) {
2709 __le16 *qos_control;
2710
2711 qos_control = skb_push(skb, 2);
2712 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2713 /*
2714 * Maybe we could actually set some fields here, for now just
2715 * initialise to zero to indicate no special operation.
2716 */
2717 *qos_control = 0;
2718 } else
2719 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2720
2721 skb_reset_mac_header(skb);
2722
2723 info = IEEE80211_SKB_CB(skb);
2724 memset(info, 0, sizeof(*info));
2725
2726 info->flags = info_flags;
2727 info->ack_frame_id = info_id;
2728 info->band = band;
2729
2730 return skb;
2731 free:
2732 kfree_skb(skb);
2733 return ERR_PTR(ret);
2734 }
2735
2736 /*
2737 * fast-xmit overview
2738 *
2739 * The core idea of this fast-xmit is to remove per-packet checks by checking
2740 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2741 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2742 * much less work can be done per packet. For example, fragmentation must be
2743 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2744 * in the code here.
2745 *
2746 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2747 * header and other data to aid packet processing in ieee80211_xmit_fast().
2748 *
2749 * The most difficult part of this is that when any of these assumptions
2750 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2751 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2752 * since the per-packet code no longer checks the conditions. This is reflected
2753 * by the calls to these functions throughout the rest of the code, and must be
2754 * maintained if any of the TX path checks change.
2755 */
2756
2757 void ieee80211_check_fast_xmit(struct sta_info *sta)
2758 {
2759 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2760 struct ieee80211_local *local = sta->local;
2761 struct ieee80211_sub_if_data *sdata = sta->sdata;
2762 struct ieee80211_hdr *hdr = (void *)build.hdr;
2763 struct ieee80211_chanctx_conf *chanctx_conf;
2764 __le16 fc;
2765
2766 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2767 return;
2768
2769 /* Locking here protects both the pointer itself, and against concurrent
2770 * invocations winning data access races to, e.g., the key pointer that
2771 * is used.
2772 * Without it, the invocation of this function right after the key
2773 * pointer changes wouldn't be sufficient, as another CPU could access
2774 * the pointer, then stall, and then do the cache update after the CPU
2775 * that invalidated the key.
2776 * With the locking, such scenarios cannot happen as the check for the
2777 * key and the fast-tx assignment are done atomically, so the CPU that
2778 * modifies the key will either wait or other one will see the key
2779 * cleared/changed already.
2780 */
2781 spin_lock_bh(&sta->lock);
2782 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2783 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2784 sdata->vif.type == NL80211_IFTYPE_STATION)
2785 goto out;
2786
2787 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2788 goto out;
2789
2790 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2791 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2792 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2793 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2794 goto out;
2795
2796 if (sdata->noack_map)
2797 goto out;
2798
2799 /* fast-xmit doesn't handle fragmentation at all */
2800 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2801 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2802 goto out;
2803
2804 rcu_read_lock();
2805 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2806 if (!chanctx_conf) {
2807 rcu_read_unlock();
2808 goto out;
2809 }
2810 build.band = chanctx_conf->def.chan->band;
2811 rcu_read_unlock();
2812
2813 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2814
2815 switch (sdata->vif.type) {
2816 case NL80211_IFTYPE_ADHOC:
2817 /* DA SA BSSID */
2818 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2819 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2820 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2821 build.hdr_len = 24;
2822 break;
2823 case NL80211_IFTYPE_STATION:
2824 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2825 /* DA SA BSSID */
2826 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2827 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2828 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2829 build.hdr_len = 24;
2830 break;
2831 }
2832
2833 if (sdata->u.mgd.use_4addr) {
2834 /* non-regular ethertype cannot use the fastpath */
2835 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2836 IEEE80211_FCTL_TODS);
2837 /* RA TA DA SA */
2838 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2839 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2840 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2841 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2842 build.hdr_len = 30;
2843 break;
2844 }
2845 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2846 /* BSSID SA DA */
2847 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2848 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2849 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2850 build.hdr_len = 24;
2851 break;
2852 case NL80211_IFTYPE_AP_VLAN:
2853 if (sdata->wdev.use_4addr) {
2854 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2855 IEEE80211_FCTL_TODS);
2856 /* RA TA DA SA */
2857 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2858 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2859 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2860 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2861 build.hdr_len = 30;
2862 break;
2863 }
2864 /* fall through */
2865 case NL80211_IFTYPE_AP:
2866 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2867 /* DA BSSID SA */
2868 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2869 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2870 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2871 build.hdr_len = 24;
2872 break;
2873 default:
2874 /* not handled on fast-xmit */
2875 goto out;
2876 }
2877
2878 if (sta->sta.wme) {
2879 build.hdr_len += 2;
2880 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2881 }
2882
2883 /* We store the key here so there's no point in using rcu_dereference()
2884 * but that's fine because the code that changes the pointers will call
2885 * this function after doing so. For a single CPU that would be enough,
2886 * for multiple see the comment above.
2887 */
2888 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2889 if (!build.key)
2890 build.key = rcu_access_pointer(sdata->default_unicast_key);
2891 if (build.key) {
2892 bool gen_iv, iv_spc, mmic;
2893
2894 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2895 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2896 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2897
2898 /* don't handle software crypto */
2899 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2900 goto out;
2901
2902 switch (build.key->conf.cipher) {
2903 case WLAN_CIPHER_SUITE_CCMP:
2904 case WLAN_CIPHER_SUITE_CCMP_256:
2905 /* add fixed key ID */
2906 if (gen_iv) {
2907 (build.hdr + build.hdr_len)[3] =
2908 0x20 | (build.key->conf.keyidx << 6);
2909 build.pn_offs = build.hdr_len;
2910 }
2911 if (gen_iv || iv_spc)
2912 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2913 break;
2914 case WLAN_CIPHER_SUITE_GCMP:
2915 case WLAN_CIPHER_SUITE_GCMP_256:
2916 /* add fixed key ID */
2917 if (gen_iv) {
2918 (build.hdr + build.hdr_len)[3] =
2919 0x20 | (build.key->conf.keyidx << 6);
2920 build.pn_offs = build.hdr_len;
2921 }
2922 if (gen_iv || iv_spc)
2923 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2924 break;
2925 case WLAN_CIPHER_SUITE_TKIP:
2926 /* cannot handle MMIC or IV generation in xmit-fast */
2927 if (mmic || gen_iv)
2928 goto out;
2929 if (iv_spc)
2930 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2931 break;
2932 case WLAN_CIPHER_SUITE_WEP40:
2933 case WLAN_CIPHER_SUITE_WEP104:
2934 /* cannot handle IV generation in fast-xmit */
2935 if (gen_iv)
2936 goto out;
2937 if (iv_spc)
2938 build.hdr_len += IEEE80211_WEP_IV_LEN;
2939 break;
2940 case WLAN_CIPHER_SUITE_AES_CMAC:
2941 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2942 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2943 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2944 WARN(1,
2945 "management cipher suite 0x%x enabled for data\n",
2946 build.key->conf.cipher);
2947 goto out;
2948 default:
2949 /* we don't know how to generate IVs for this at all */
2950 if (WARN_ON(gen_iv))
2951 goto out;
2952 /* pure hardware keys are OK, of course */
2953 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2954 break;
2955 /* cipher scheme might require space allocation */
2956 if (iv_spc &&
2957 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2958 goto out;
2959 if (iv_spc)
2960 build.hdr_len += build.key->conf.iv_len;
2961 }
2962
2963 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2964 }
2965
2966 hdr->frame_control = fc;
2967
2968 memcpy(build.hdr + build.hdr_len,
2969 rfc1042_header, sizeof(rfc1042_header));
2970 build.hdr_len += sizeof(rfc1042_header);
2971
2972 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2973 /* if the kmemdup fails, continue w/o fast_tx */
2974 if (!fast_tx)
2975 goto out;
2976
2977 out:
2978 /* we might have raced against another call to this function */
2979 old = rcu_dereference_protected(sta->fast_tx,
2980 lockdep_is_held(&sta->lock));
2981 rcu_assign_pointer(sta->fast_tx, fast_tx);
2982 if (old)
2983 kfree_rcu(old, rcu_head);
2984 spin_unlock_bh(&sta->lock);
2985 }
2986
2987 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2988 {
2989 struct sta_info *sta;
2990
2991 rcu_read_lock();
2992 list_for_each_entry_rcu(sta, &local->sta_list, list)
2993 ieee80211_check_fast_xmit(sta);
2994 rcu_read_unlock();
2995 }
2996
2997 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2998 {
2999 struct ieee80211_local *local = sdata->local;
3000 struct sta_info *sta;
3001
3002 rcu_read_lock();
3003
3004 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3005 if (sdata != sta->sdata &&
3006 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3007 continue;
3008 ieee80211_check_fast_xmit(sta);
3009 }
3010
3011 rcu_read_unlock();
3012 }
3013
3014 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3015 {
3016 struct ieee80211_fast_tx *fast_tx;
3017
3018 spin_lock_bh(&sta->lock);
3019 fast_tx = rcu_dereference_protected(sta->fast_tx,
3020 lockdep_is_held(&sta->lock));
3021 RCU_INIT_POINTER(sta->fast_tx, NULL);
3022 spin_unlock_bh(&sta->lock);
3023
3024 if (fast_tx)
3025 kfree_rcu(fast_tx, rcu_head);
3026 }
3027
3028 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3029 struct sk_buff *skb, int headroom,
3030 int *subframe_len)
3031 {
3032 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3033 int padding = (4 - amsdu_len) & 3;
3034
3035 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3036 I802_DEBUG_INC(local->tx_expand_skb_head);
3037
3038 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3039 wiphy_debug(local->hw.wiphy,
3040 "failed to reallocate TX buffer\n");
3041 return false;
3042 }
3043 }
3044
3045 if (padding) {
3046 *subframe_len += padding;
3047 skb_put_zero(skb, padding);
3048 }
3049
3050 return true;
3051 }
3052
3053 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3054 struct ieee80211_fast_tx *fast_tx,
3055 struct sk_buff *skb)
3056 {
3057 struct ieee80211_local *local = sdata->local;
3058 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3059 struct ieee80211_hdr *hdr;
3060 struct ethhdr *amsdu_hdr;
3061 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3062 int subframe_len = skb->len - hdr_len;
3063 void *data;
3064 u8 *qc, *h_80211_src, *h_80211_dst;
3065 const u8 *bssid;
3066
3067 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3068 return false;
3069
3070 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3071 return true;
3072
3073 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr),
3074 &subframe_len))
3075 return false;
3076
3077 data = skb_push(skb, sizeof(*amsdu_hdr));
3078 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3079 hdr = data;
3080 amsdu_hdr = data + hdr_len;
3081 /* h_80211_src/dst is addr* field within hdr */
3082 h_80211_src = data + fast_tx->sa_offs;
3083 h_80211_dst = data + fast_tx->da_offs;
3084
3085 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3086 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3087 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3088
3089 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3090 * fields needs to be changed to BSSID for A-MSDU frames depending
3091 * on FromDS/ToDS values.
3092 */
3093 switch (sdata->vif.type) {
3094 case NL80211_IFTYPE_STATION:
3095 bssid = sdata->u.mgd.bssid;
3096 break;
3097 case NL80211_IFTYPE_AP:
3098 case NL80211_IFTYPE_AP_VLAN:
3099 bssid = sdata->vif.addr;
3100 break;
3101 default:
3102 bssid = NULL;
3103 }
3104
3105 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3106 ether_addr_copy(h_80211_src, bssid);
3107
3108 if (bssid && ieee80211_has_tods(hdr->frame_control))
3109 ether_addr_copy(h_80211_dst, bssid);
3110
3111 qc = ieee80211_get_qos_ctl(hdr);
3112 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3113
3114 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3115
3116 return true;
3117 }
3118
3119 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3120 struct sta_info *sta,
3121 struct ieee80211_fast_tx *fast_tx,
3122 struct sk_buff *skb)
3123 {
3124 struct ieee80211_local *local = sdata->local;
3125 struct fq *fq = &local->fq;
3126 struct fq_tin *tin;
3127 struct fq_flow *flow;
3128 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3129 struct ieee80211_txq *txq = sta->sta.txq[tid];
3130 struct txq_info *txqi;
3131 struct sk_buff **frag_tail, *head;
3132 int subframe_len = skb->len - ETH_ALEN;
3133 u8 max_subframes = sta->sta.max_amsdu_subframes;
3134 int max_frags = local->hw.max_tx_fragments;
3135 int max_amsdu_len = sta->sta.max_amsdu_len;
3136 __be16 len;
3137 void *data;
3138 bool ret = false;
3139 unsigned int orig_len;
3140 int n = 1, nfrags;
3141
3142 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3143 return false;
3144
3145 if (!txq)
3146 return false;
3147
3148 txqi = to_txq_info(txq);
3149 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3150 return false;
3151
3152 if (sta->sta.max_rc_amsdu_len)
3153 max_amsdu_len = min_t(int, max_amsdu_len,
3154 sta->sta.max_rc_amsdu_len);
3155
3156 spin_lock_bh(&fq->lock);
3157
3158 /* TODO: Ideally aggregation should be done on dequeue to remain
3159 * responsive to environment changes.
3160 */
3161
3162 tin = &txqi->tin;
3163 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3164 head = skb_peek_tail(&flow->queue);
3165 if (!head)
3166 goto out;
3167
3168 orig_len = head->len;
3169
3170 if (skb->len + head->len > max_amsdu_len)
3171 goto out;
3172
3173 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3174 goto out;
3175
3176 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3177 nfrags += 1 + skb_shinfo(head)->nr_frags;
3178 frag_tail = &skb_shinfo(head)->frag_list;
3179 while (*frag_tail) {
3180 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3181 frag_tail = &(*frag_tail)->next;
3182 n++;
3183 }
3184
3185 if (max_subframes && n > max_subframes)
3186 goto out;
3187
3188 if (max_frags && nfrags > max_frags)
3189 goto out;
3190
3191 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3192 &subframe_len))
3193 goto out;
3194
3195 ret = true;
3196 data = skb_push(skb, ETH_ALEN + 2);
3197 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3198
3199 data += 2 * ETH_ALEN;
3200 len = cpu_to_be16(subframe_len);
3201 memcpy(data, &len, 2);
3202 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3203
3204 head->len += skb->len;
3205 head->data_len += skb->len;
3206 *frag_tail = skb;
3207
3208 flow->backlog += head->len - orig_len;
3209 tin->backlog_bytes += head->len - orig_len;
3210
3211 fq_recalc_backlog(fq, tin, flow);
3212
3213 out:
3214 spin_unlock_bh(&fq->lock);
3215
3216 return ret;
3217 }
3218
3219 /*
3220 * Can be called while the sta lock is held. Anything that can cause packets to
3221 * be generated will cause deadlock!
3222 */
3223 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3224 struct sta_info *sta, u8 pn_offs,
3225 struct ieee80211_key *key,
3226 struct sk_buff *skb)
3227 {
3228 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3229 struct ieee80211_hdr *hdr = (void *)skb->data;
3230 u8 tid = IEEE80211_NUM_TIDS;
3231
3232 if (key)
3233 info->control.hw_key = &key->conf;
3234
3235 ieee80211_tx_stats(skb->dev, skb->len);
3236
3237 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3238 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3239 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3240 } else {
3241 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3242 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3243 sdata->sequence_number += 0x10;
3244 }
3245
3246 if (skb_shinfo(skb)->gso_size)
3247 sta->tx_stats.msdu[tid] +=
3248 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3249 else
3250 sta->tx_stats.msdu[tid]++;
3251
3252 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3253
3254 /* statistics normally done by ieee80211_tx_h_stats (but that
3255 * has to consider fragmentation, so is more complex)
3256 */
3257 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3258 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3259
3260 if (pn_offs) {
3261 u64 pn;
3262 u8 *crypto_hdr = skb->data + pn_offs;
3263
3264 switch (key->conf.cipher) {
3265 case WLAN_CIPHER_SUITE_CCMP:
3266 case WLAN_CIPHER_SUITE_CCMP_256:
3267 case WLAN_CIPHER_SUITE_GCMP:
3268 case WLAN_CIPHER_SUITE_GCMP_256:
3269 pn = atomic64_inc_return(&key->conf.tx_pn);
3270 crypto_hdr[0] = pn;
3271 crypto_hdr[1] = pn >> 8;
3272 crypto_hdr[4] = pn >> 16;
3273 crypto_hdr[5] = pn >> 24;
3274 crypto_hdr[6] = pn >> 32;
3275 crypto_hdr[7] = pn >> 40;
3276 break;
3277 }
3278 }
3279 }
3280
3281 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3282 struct sta_info *sta,
3283 struct ieee80211_fast_tx *fast_tx,
3284 struct sk_buff *skb)
3285 {
3286 struct ieee80211_local *local = sdata->local;
3287 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3288 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3289 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3290 struct ethhdr eth;
3291 struct ieee80211_tx_info *info;
3292 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3293 struct ieee80211_tx_data tx;
3294 ieee80211_tx_result r;
3295 struct tid_ampdu_tx *tid_tx = NULL;
3296 u8 tid = IEEE80211_NUM_TIDS;
3297
3298 /* control port protocol needs a lot of special handling */
3299 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3300 return false;
3301
3302 /* only RFC 1042 SNAP */
3303 if (ethertype < ETH_P_802_3_MIN)
3304 return false;
3305
3306 /* don't handle TX status request here either */
3307 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3308 return false;
3309
3310 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3311 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3312 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3313 if (tid_tx) {
3314 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3315 return false;
3316 if (tid_tx->timeout)
3317 tid_tx->last_tx = jiffies;
3318 }
3319 }
3320
3321 /* after this point (skb is modified) we cannot return false */
3322
3323 if (skb_shared(skb)) {
3324 struct sk_buff *tmp_skb = skb;
3325
3326 skb = skb_clone(skb, GFP_ATOMIC);
3327 kfree_skb(tmp_skb);
3328
3329 if (!skb)
3330 return true;
3331 }
3332
3333 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3334 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3335 return true;
3336
3337 /* will not be crypto-handled beyond what we do here, so use false
3338 * as the may-encrypt argument for the resize to not account for
3339 * more room than we already have in 'extra_head'
3340 */
3341 if (unlikely(ieee80211_skb_resize(sdata, skb,
3342 max_t(int, extra_head + hw_headroom -
3343 skb_headroom(skb), 0),
3344 false))) {
3345 kfree_skb(skb);
3346 return true;
3347 }
3348
3349 memcpy(&eth, skb->data, ETH_HLEN - 2);
3350 hdr = skb_push(skb, extra_head);
3351 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3352 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3353 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3354
3355 info = IEEE80211_SKB_CB(skb);
3356 memset(info, 0, sizeof(*info));
3357 info->band = fast_tx->band;
3358 info->control.vif = &sdata->vif;
3359 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3360 IEEE80211_TX_CTL_DONTFRAG |
3361 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3362 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3363
3364 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3365 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3366 *ieee80211_get_qos_ctl(hdr) = tid;
3367 }
3368
3369 __skb_queue_head_init(&tx.skbs);
3370
3371 tx.flags = IEEE80211_TX_UNICAST;
3372 tx.local = local;
3373 tx.sdata = sdata;
3374 tx.sta = sta;
3375 tx.key = fast_tx->key;
3376
3377 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3378 tx.skb = skb;
3379 r = ieee80211_tx_h_rate_ctrl(&tx);
3380 skb = tx.skb;
3381 tx.skb = NULL;
3382
3383 if (r != TX_CONTINUE) {
3384 if (r != TX_QUEUED)
3385 kfree_skb(skb);
3386 return true;
3387 }
3388 }
3389
3390 if (ieee80211_queue_skb(local, sdata, sta, skb))
3391 return true;
3392
3393 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3394 fast_tx->key, skb);
3395
3396 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3397 sdata = container_of(sdata->bss,
3398 struct ieee80211_sub_if_data, u.ap);
3399
3400 __skb_queue_tail(&tx.skbs, skb);
3401 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3402 return true;
3403 }
3404
3405 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3406 struct ieee80211_txq *txq)
3407 {
3408 struct ieee80211_local *local = hw_to_local(hw);
3409 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3410 struct ieee80211_hdr *hdr;
3411 struct sk_buff *skb = NULL;
3412 struct fq *fq = &local->fq;
3413 struct fq_tin *tin = &txqi->tin;
3414 struct ieee80211_tx_info *info;
3415 struct ieee80211_tx_data tx;
3416 ieee80211_tx_result r;
3417
3418 spin_lock_bh(&fq->lock);
3419
3420 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3421 goto out;
3422
3423 /* Make sure fragments stay together. */
3424 skb = __skb_dequeue(&txqi->frags);
3425 if (skb)
3426 goto out;
3427
3428 begin:
3429 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3430 if (!skb)
3431 goto out;
3432
3433 ieee80211_set_skb_vif(skb, txqi);
3434
3435 hdr = (struct ieee80211_hdr *)skb->data;
3436 info = IEEE80211_SKB_CB(skb);
3437
3438 memset(&tx, 0, sizeof(tx));
3439 __skb_queue_head_init(&tx.skbs);
3440 tx.local = local;
3441 tx.skb = skb;
3442 tx.sdata = vif_to_sdata(info->control.vif);
3443
3444 if (txq->sta)
3445 tx.sta = container_of(txq->sta, struct sta_info, sta);
3446
3447 /*
3448 * The key can be removed while the packet was queued, so need to call
3449 * this here to get the current key.
3450 */
3451 r = ieee80211_tx_h_select_key(&tx);
3452 if (r != TX_CONTINUE) {
3453 ieee80211_free_txskb(&local->hw, skb);
3454 goto begin;
3455 }
3456
3457 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3458 info->flags |= IEEE80211_TX_CTL_AMPDU;
3459 else
3460 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3461
3462 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3463 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3464 sta);
3465 u8 pn_offs = 0;
3466
3467 if (tx.key &&
3468 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3469 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3470
3471 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3472 tx.key, skb);
3473 } else {
3474 if (invoke_tx_handlers_late(&tx))
3475 goto begin;
3476
3477 skb = __skb_dequeue(&tx.skbs);
3478
3479 if (!skb_queue_empty(&tx.skbs))
3480 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3481 }
3482
3483 if (skb && skb_has_frag_list(skb) &&
3484 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3485 if (skb_linearize(skb)) {
3486 ieee80211_free_txskb(&local->hw, skb);
3487 goto begin;
3488 }
3489 }
3490
3491 out:
3492 spin_unlock_bh(&fq->lock);
3493
3494 return skb;
3495 }
3496 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3497
3498 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3499 struct net_device *dev,
3500 u32 info_flags)
3501 {
3502 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3503 struct sta_info *sta;
3504 struct sk_buff *next;
3505
3506 if (unlikely(skb->len < ETH_HLEN)) {
3507 kfree_skb(skb);
3508 return;
3509 }
3510
3511 rcu_read_lock();
3512
3513 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3514 goto out_free;
3515
3516 if (!IS_ERR_OR_NULL(sta)) {
3517 struct ieee80211_fast_tx *fast_tx;
3518
3519 fast_tx = rcu_dereference(sta->fast_tx);
3520
3521 if (fast_tx &&
3522 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3523 goto out;
3524 }
3525
3526 if (skb_is_gso(skb)) {
3527 struct sk_buff *segs;
3528
3529 segs = skb_gso_segment(skb, 0);
3530 if (IS_ERR(segs)) {
3531 goto out_free;
3532 } else if (segs) {
3533 consume_skb(skb);
3534 skb = segs;
3535 }
3536 } else {
3537 /* we cannot process non-linear frames on this path */
3538 if (skb_linearize(skb)) {
3539 kfree_skb(skb);
3540 goto out;
3541 }
3542
3543 /* the frame could be fragmented, software-encrypted, and other
3544 * things so we cannot really handle checksum offload with it -
3545 * fix it up in software before we handle anything else.
3546 */
3547 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3548 skb_set_transport_header(skb,
3549 skb_checksum_start_offset(skb));
3550 if (skb_checksum_help(skb))
3551 goto out_free;
3552 }
3553 }
3554
3555 next = skb;
3556 while (next) {
3557 skb = next;
3558 next = skb->next;
3559
3560 skb->prev = NULL;
3561 skb->next = NULL;
3562
3563 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3564 if (IS_ERR(skb))
3565 goto out;
3566
3567 ieee80211_tx_stats(dev, skb->len);
3568
3569 ieee80211_xmit(sdata, sta, skb);
3570 }
3571 goto out;
3572 out_free:
3573 kfree_skb(skb);
3574 out:
3575 rcu_read_unlock();
3576 }
3577
3578 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3579 {
3580 struct ethhdr *eth;
3581 int err;
3582
3583 err = skb_ensure_writable(skb, ETH_HLEN);
3584 if (unlikely(err))
3585 return err;
3586
3587 eth = (void *)skb->data;
3588 ether_addr_copy(eth->h_dest, sta->sta.addr);
3589
3590 return 0;
3591 }
3592
3593 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3594 struct net_device *dev)
3595 {
3596 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3597 const struct ethhdr *eth = (void *)skb->data;
3598 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3599 __be16 ethertype;
3600
3601 if (likely(!is_multicast_ether_addr(eth->h_dest)))
3602 return false;
3603
3604 switch (sdata->vif.type) {
3605 case NL80211_IFTYPE_AP_VLAN:
3606 if (sdata->u.vlan.sta)
3607 return false;
3608 if (sdata->wdev.use_4addr)
3609 return false;
3610 /* fall through */
3611 case NL80211_IFTYPE_AP:
3612 /* check runtime toggle for this bss */
3613 if (!sdata->bss->multicast_to_unicast)
3614 return false;
3615 break;
3616 default:
3617 return false;
3618 }
3619
3620 /* multicast to unicast conversion only for some payload */
3621 ethertype = eth->h_proto;
3622 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3623 ethertype = ethvlan->h_vlan_encapsulated_proto;
3624 switch (ethertype) {
3625 case htons(ETH_P_ARP):
3626 case htons(ETH_P_IP):
3627 case htons(ETH_P_IPV6):
3628 break;
3629 default:
3630 return false;
3631 }
3632
3633 return true;
3634 }
3635
3636 static void
3637 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3638 struct sk_buff_head *queue)
3639 {
3640 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3641 struct ieee80211_local *local = sdata->local;
3642 const struct ethhdr *eth = (struct ethhdr *)skb->data;
3643 struct sta_info *sta, *first = NULL;
3644 struct sk_buff *cloned_skb;
3645
3646 rcu_read_lock();
3647
3648 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3649 if (sdata != sta->sdata)
3650 /* AP-VLAN mismatch */
3651 continue;
3652 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3653 /* do not send back to source */
3654 continue;
3655 if (!first) {
3656 first = sta;
3657 continue;
3658 }
3659 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3660 if (!cloned_skb)
3661 goto multicast;
3662 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3663 dev_kfree_skb(cloned_skb);
3664 goto multicast;
3665 }
3666 __skb_queue_tail(queue, cloned_skb);
3667 }
3668
3669 if (likely(first)) {
3670 if (unlikely(ieee80211_change_da(skb, first)))
3671 goto multicast;
3672 __skb_queue_tail(queue, skb);
3673 } else {
3674 /* no STA connected, drop */
3675 kfree_skb(skb);
3676 skb = NULL;
3677 }
3678
3679 goto out;
3680 multicast:
3681 __skb_queue_purge(queue);
3682 __skb_queue_tail(queue, skb);
3683 out:
3684 rcu_read_unlock();
3685 }
3686
3687 /**
3688 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3689 * @skb: packet to be sent
3690 * @dev: incoming interface
3691 *
3692 * On failure skb will be freed.
3693 */
3694 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3695 struct net_device *dev)
3696 {
3697 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3698 struct sk_buff_head queue;
3699
3700 __skb_queue_head_init(&queue);
3701 ieee80211_convert_to_unicast(skb, dev, &queue);
3702 while ((skb = __skb_dequeue(&queue)))
3703 __ieee80211_subif_start_xmit(skb, dev, 0);
3704 } else {
3705 __ieee80211_subif_start_xmit(skb, dev, 0);
3706 }
3707
3708 return NETDEV_TX_OK;
3709 }
3710
3711 struct sk_buff *
3712 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3713 struct sk_buff *skb, u32 info_flags)
3714 {
3715 struct ieee80211_hdr *hdr;
3716 struct ieee80211_tx_data tx = {
3717 .local = sdata->local,
3718 .sdata = sdata,
3719 };
3720 struct sta_info *sta;
3721
3722 rcu_read_lock();
3723
3724 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3725 kfree_skb(skb);
3726 skb = ERR_PTR(-EINVAL);
3727 goto out;
3728 }
3729
3730 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3731 if (IS_ERR(skb))
3732 goto out;
3733
3734 hdr = (void *)skb->data;
3735 tx.sta = sta_info_get(sdata, hdr->addr1);
3736 tx.skb = skb;
3737
3738 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3739 rcu_read_unlock();
3740 kfree_skb(skb);
3741 return ERR_PTR(-EINVAL);
3742 }
3743
3744 out:
3745 rcu_read_unlock();
3746 return skb;
3747 }
3748
3749 /*
3750 * ieee80211_clear_tx_pending may not be called in a context where
3751 * it is possible that it packets could come in again.
3752 */
3753 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3754 {
3755 struct sk_buff *skb;
3756 int i;
3757
3758 for (i = 0; i < local->hw.queues; i++) {
3759 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3760 ieee80211_free_txskb(&local->hw, skb);
3761 }
3762 }
3763
3764 /*
3765 * Returns false if the frame couldn't be transmitted but was queued instead,
3766 * which in this case means re-queued -- take as an indication to stop sending
3767 * more pending frames.
3768 */
3769 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3770 struct sk_buff *skb)
3771 {
3772 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3773 struct ieee80211_sub_if_data *sdata;
3774 struct sta_info *sta;
3775 struct ieee80211_hdr *hdr;
3776 bool result;
3777 struct ieee80211_chanctx_conf *chanctx_conf;
3778
3779 sdata = vif_to_sdata(info->control.vif);
3780
3781 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3782 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3783 if (unlikely(!chanctx_conf)) {
3784 dev_kfree_skb(skb);
3785 return true;
3786 }
3787 info->band = chanctx_conf->def.chan->band;
3788 result = ieee80211_tx(sdata, NULL, skb, true);
3789 } else {
3790 struct sk_buff_head skbs;
3791
3792 __skb_queue_head_init(&skbs);
3793 __skb_queue_tail(&skbs, skb);
3794
3795 hdr = (struct ieee80211_hdr *)skb->data;
3796 sta = sta_info_get(sdata, hdr->addr1);
3797
3798 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3799 }
3800
3801 return result;
3802 }
3803
3804 /*
3805 * Transmit all pending packets. Called from tasklet.
3806 */
3807 void ieee80211_tx_pending(unsigned long data)
3808 {
3809 struct ieee80211_local *local = (struct ieee80211_local *)data;
3810 unsigned long flags;
3811 int i;
3812 bool txok;
3813
3814 rcu_read_lock();
3815
3816 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3817 for (i = 0; i < local->hw.queues; i++) {
3818 /*
3819 * If queue is stopped by something other than due to pending
3820 * frames, or we have no pending frames, proceed to next queue.
3821 */
3822 if (local->queue_stop_reasons[i] ||
3823 skb_queue_empty(&local->pending[i]))
3824 continue;
3825
3826 while (!skb_queue_empty(&local->pending[i])) {
3827 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3828 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3829
3830 if (WARN_ON(!info->control.vif)) {
3831 ieee80211_free_txskb(&local->hw, skb);
3832 continue;
3833 }
3834
3835 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3836 flags);
3837
3838 txok = ieee80211_tx_pending_skb(local, skb);
3839 spin_lock_irqsave(&local->queue_stop_reason_lock,
3840 flags);
3841 if (!txok)
3842 break;
3843 }
3844
3845 if (skb_queue_empty(&local->pending[i]))
3846 ieee80211_propagate_queue_wake(local, i);
3847 }
3848 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3849
3850 rcu_read_unlock();
3851 }
3852
3853 /* functions for drivers to get certain frames */
3854
3855 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3856 struct ps_data *ps, struct sk_buff *skb,
3857 bool is_template)
3858 {
3859 u8 *pos, *tim;
3860 int aid0 = 0;
3861 int i, have_bits = 0, n1, n2;
3862
3863 /* Generate bitmap for TIM only if there are any STAs in power save
3864 * mode. */
3865 if (atomic_read(&ps->num_sta_ps) > 0)
3866 /* in the hope that this is faster than
3867 * checking byte-for-byte */
3868 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3869 IEEE80211_MAX_AID+1);
3870 if (!is_template) {
3871 if (ps->dtim_count == 0)
3872 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3873 else
3874 ps->dtim_count--;
3875 }
3876
3877 tim = pos = skb_put(skb, 6);
3878 *pos++ = WLAN_EID_TIM;
3879 *pos++ = 4;
3880 *pos++ = ps->dtim_count;
3881 *pos++ = sdata->vif.bss_conf.dtim_period;
3882
3883 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3884 aid0 = 1;
3885
3886 ps->dtim_bc_mc = aid0 == 1;
3887
3888 if (have_bits) {
3889 /* Find largest even number N1 so that bits numbered 1 through
3890 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3891 * (N2 + 1) x 8 through 2007 are 0. */
3892 n1 = 0;
3893 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3894 if (ps->tim[i]) {
3895 n1 = i & 0xfe;
3896 break;
3897 }
3898 }
3899 n2 = n1;
3900 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3901 if (ps->tim[i]) {
3902 n2 = i;
3903 break;
3904 }
3905 }
3906
3907 /* Bitmap control */
3908 *pos++ = n1 | aid0;
3909 /* Part Virt Bitmap */
3910 skb_put(skb, n2 - n1);
3911 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3912
3913 tim[1] = n2 - n1 + 4;
3914 } else {
3915 *pos++ = aid0; /* Bitmap control */
3916 *pos++ = 0; /* Part Virt Bitmap */
3917 }
3918 }
3919
3920 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3921 struct ps_data *ps, struct sk_buff *skb,
3922 bool is_template)
3923 {
3924 struct ieee80211_local *local = sdata->local;
3925
3926 /*
3927 * Not very nice, but we want to allow the driver to call
3928 * ieee80211_beacon_get() as a response to the set_tim()
3929 * callback. That, however, is already invoked under the
3930 * sta_lock to guarantee consistent and race-free update
3931 * of the tim bitmap in mac80211 and the driver.
3932 */
3933 if (local->tim_in_locked_section) {
3934 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3935 } else {
3936 spin_lock_bh(&local->tim_lock);
3937 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3938 spin_unlock_bh(&local->tim_lock);
3939 }
3940
3941 return 0;
3942 }
3943
3944 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3945 struct beacon_data *beacon)
3946 {
3947 struct probe_resp *resp;
3948 u8 *beacon_data;
3949 size_t beacon_data_len;
3950 int i;
3951 u8 count = beacon->csa_current_counter;
3952
3953 switch (sdata->vif.type) {
3954 case NL80211_IFTYPE_AP:
3955 beacon_data = beacon->tail;
3956 beacon_data_len = beacon->tail_len;
3957 break;
3958 case NL80211_IFTYPE_ADHOC:
3959 beacon_data = beacon->head;
3960 beacon_data_len = beacon->head_len;
3961 break;
3962 case NL80211_IFTYPE_MESH_POINT:
3963 beacon_data = beacon->head;
3964 beacon_data_len = beacon->head_len;
3965 break;
3966 default:
3967 return;
3968 }
3969
3970 rcu_read_lock();
3971 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3972 resp = rcu_dereference(sdata->u.ap.probe_resp);
3973
3974 if (beacon->csa_counter_offsets[i]) {
3975 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3976 beacon_data_len)) {
3977 rcu_read_unlock();
3978 return;
3979 }
3980
3981 beacon_data[beacon->csa_counter_offsets[i]] = count;
3982 }
3983
3984 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3985 resp->data[resp->csa_counter_offsets[i]] = count;
3986 }
3987 rcu_read_unlock();
3988 }
3989
3990 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3991 {
3992 beacon->csa_current_counter--;
3993
3994 /* the counter should never reach 0 */
3995 WARN_ON_ONCE(!beacon->csa_current_counter);
3996
3997 return beacon->csa_current_counter;
3998 }
3999
4000 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4001 {
4002 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4003 struct beacon_data *beacon = NULL;
4004 u8 count = 0;
4005
4006 rcu_read_lock();
4007
4008 if (sdata->vif.type == NL80211_IFTYPE_AP)
4009 beacon = rcu_dereference(sdata->u.ap.beacon);
4010 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4011 beacon = rcu_dereference(sdata->u.ibss.presp);
4012 else if (ieee80211_vif_is_mesh(&sdata->vif))
4013 beacon = rcu_dereference(sdata->u.mesh.beacon);
4014
4015 if (!beacon)
4016 goto unlock;
4017
4018 count = __ieee80211_csa_update_counter(beacon);
4019
4020 unlock:
4021 rcu_read_unlock();
4022 return count;
4023 }
4024 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4025
4026 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4027 {
4028 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4029 struct beacon_data *beacon = NULL;
4030 u8 *beacon_data;
4031 size_t beacon_data_len;
4032 int ret = false;
4033
4034 if (!ieee80211_sdata_running(sdata))
4035 return false;
4036
4037 rcu_read_lock();
4038 if (vif->type == NL80211_IFTYPE_AP) {
4039 struct ieee80211_if_ap *ap = &sdata->u.ap;
4040
4041 beacon = rcu_dereference(ap->beacon);
4042 if (WARN_ON(!beacon || !beacon->tail))
4043 goto out;
4044 beacon_data = beacon->tail;
4045 beacon_data_len = beacon->tail_len;
4046 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4047 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4048
4049 beacon = rcu_dereference(ifibss->presp);
4050 if (!beacon)
4051 goto out;
4052
4053 beacon_data = beacon->head;
4054 beacon_data_len = beacon->head_len;
4055 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4056 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4057
4058 beacon = rcu_dereference(ifmsh->beacon);
4059 if (!beacon)
4060 goto out;
4061
4062 beacon_data = beacon->head;
4063 beacon_data_len = beacon->head_len;
4064 } else {
4065 WARN_ON(1);
4066 goto out;
4067 }
4068
4069 if (!beacon->csa_counter_offsets[0])
4070 goto out;
4071
4072 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4073 goto out;
4074
4075 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4076 ret = true;
4077 out:
4078 rcu_read_unlock();
4079
4080 return ret;
4081 }
4082 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4083
4084 static struct sk_buff *
4085 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4086 struct ieee80211_vif *vif,
4087 struct ieee80211_mutable_offsets *offs,
4088 bool is_template)
4089 {
4090 struct ieee80211_local *local = hw_to_local(hw);
4091 struct beacon_data *beacon = NULL;
4092 struct sk_buff *skb = NULL;
4093 struct ieee80211_tx_info *info;
4094 struct ieee80211_sub_if_data *sdata = NULL;
4095 enum nl80211_band band;
4096 struct ieee80211_tx_rate_control txrc;
4097 struct ieee80211_chanctx_conf *chanctx_conf;
4098 int csa_off_base = 0;
4099
4100 rcu_read_lock();
4101
4102 sdata = vif_to_sdata(vif);
4103 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4104
4105 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4106 goto out;
4107
4108 if (offs)
4109 memset(offs, 0, sizeof(*offs));
4110
4111 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4112 struct ieee80211_if_ap *ap = &sdata->u.ap;
4113
4114 beacon = rcu_dereference(ap->beacon);
4115 if (beacon) {
4116 if (beacon->csa_counter_offsets[0]) {
4117 if (!is_template)
4118 __ieee80211_csa_update_counter(beacon);
4119
4120 ieee80211_set_csa(sdata, beacon);
4121 }
4122
4123 /*
4124 * headroom, head length,
4125 * tail length and maximum TIM length
4126 */
4127 skb = dev_alloc_skb(local->tx_headroom +
4128 beacon->head_len +
4129 beacon->tail_len + 256 +
4130 local->hw.extra_beacon_tailroom);
4131 if (!skb)
4132 goto out;
4133
4134 skb_reserve(skb, local->tx_headroom);
4135 skb_put_data(skb, beacon->head, beacon->head_len);
4136
4137 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4138 is_template);
4139
4140 if (offs) {
4141 offs->tim_offset = beacon->head_len;
4142 offs->tim_length = skb->len - beacon->head_len;
4143
4144 /* for AP the csa offsets are from tail */
4145 csa_off_base = skb->len;
4146 }
4147
4148 if (beacon->tail)
4149 skb_put_data(skb, beacon->tail,
4150 beacon->tail_len);
4151 } else
4152 goto out;
4153 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4154 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4155 struct ieee80211_hdr *hdr;
4156
4157 beacon = rcu_dereference(ifibss->presp);
4158 if (!beacon)
4159 goto out;
4160
4161 if (beacon->csa_counter_offsets[0]) {
4162 if (!is_template)
4163 __ieee80211_csa_update_counter(beacon);
4164
4165 ieee80211_set_csa(sdata, beacon);
4166 }
4167
4168 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4169 local->hw.extra_beacon_tailroom);
4170 if (!skb)
4171 goto out;
4172 skb_reserve(skb, local->tx_headroom);
4173 skb_put_data(skb, beacon->head, beacon->head_len);
4174
4175 hdr = (struct ieee80211_hdr *) skb->data;
4176 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4177 IEEE80211_STYPE_BEACON);
4178 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4179 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4180
4181 beacon = rcu_dereference(ifmsh->beacon);
4182 if (!beacon)
4183 goto out;
4184
4185 if (beacon->csa_counter_offsets[0]) {
4186 if (!is_template)
4187 /* TODO: For mesh csa_counter is in TU, so
4188 * decrementing it by one isn't correct, but
4189 * for now we leave it consistent with overall
4190 * mac80211's behavior.
4191 */
4192 __ieee80211_csa_update_counter(beacon);
4193
4194 ieee80211_set_csa(sdata, beacon);
4195 }
4196
4197 if (ifmsh->sync_ops)
4198 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4199
4200 skb = dev_alloc_skb(local->tx_headroom +
4201 beacon->head_len +
4202 256 + /* TIM IE */
4203 beacon->tail_len +
4204 local->hw.extra_beacon_tailroom);
4205 if (!skb)
4206 goto out;
4207 skb_reserve(skb, local->tx_headroom);
4208 skb_put_data(skb, beacon->head, beacon->head_len);
4209 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4210
4211 if (offs) {
4212 offs->tim_offset = beacon->head_len;
4213 offs->tim_length = skb->len - beacon->head_len;
4214 }
4215
4216 skb_put_data(skb, beacon->tail, beacon->tail_len);
4217 } else {
4218 WARN_ON(1);
4219 goto out;
4220 }
4221
4222 /* CSA offsets */
4223 if (offs && beacon) {
4224 int i;
4225
4226 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4227 u16 csa_off = beacon->csa_counter_offsets[i];
4228
4229 if (!csa_off)
4230 continue;
4231
4232 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4233 }
4234 }
4235
4236 band = chanctx_conf->def.chan->band;
4237
4238 info = IEEE80211_SKB_CB(skb);
4239
4240 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4241 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4242 info->band = band;
4243
4244 memset(&txrc, 0, sizeof(txrc));
4245 txrc.hw = hw;
4246 txrc.sband = local->hw.wiphy->bands[band];
4247 txrc.bss_conf = &sdata->vif.bss_conf;
4248 txrc.skb = skb;
4249 txrc.reported_rate.idx = -1;
4250 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4251 txrc.bss = true;
4252 rate_control_get_rate(sdata, NULL, &txrc);
4253
4254 info->control.vif = vif;
4255
4256 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4257 IEEE80211_TX_CTL_ASSIGN_SEQ |
4258 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4259 out:
4260 rcu_read_unlock();
4261 return skb;
4262
4263 }
4264
4265 struct sk_buff *
4266 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4267 struct ieee80211_vif *vif,
4268 struct ieee80211_mutable_offsets *offs)
4269 {
4270 return __ieee80211_beacon_get(hw, vif, offs, true);
4271 }
4272 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4273
4274 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4275 struct ieee80211_vif *vif,
4276 u16 *tim_offset, u16 *tim_length)
4277 {
4278 struct ieee80211_mutable_offsets offs = {};
4279 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4280 struct sk_buff *copy;
4281 struct ieee80211_supported_band *sband;
4282 int shift;
4283
4284 if (!bcn)
4285 return bcn;
4286
4287 if (tim_offset)
4288 *tim_offset = offs.tim_offset;
4289
4290 if (tim_length)
4291 *tim_length = offs.tim_length;
4292
4293 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4294 !hw_to_local(hw)->monitors)
4295 return bcn;
4296
4297 /* send a copy to monitor interfaces */
4298 copy = skb_copy(bcn, GFP_ATOMIC);
4299 if (!copy)
4300 return bcn;
4301
4302 shift = ieee80211_vif_get_shift(vif);
4303 sband = ieee80211_get_sband(vif_to_sdata(vif));
4304 if (!sband)
4305 return bcn;
4306
4307 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4308
4309 return bcn;
4310 }
4311 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4312
4313 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4314 struct ieee80211_vif *vif)
4315 {
4316 struct ieee80211_if_ap *ap = NULL;
4317 struct sk_buff *skb = NULL;
4318 struct probe_resp *presp = NULL;
4319 struct ieee80211_hdr *hdr;
4320 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4321
4322 if (sdata->vif.type != NL80211_IFTYPE_AP)
4323 return NULL;
4324
4325 rcu_read_lock();
4326
4327 ap = &sdata->u.ap;
4328 presp = rcu_dereference(ap->probe_resp);
4329 if (!presp)
4330 goto out;
4331
4332 skb = dev_alloc_skb(presp->len);
4333 if (!skb)
4334 goto out;
4335
4336 skb_put_data(skb, presp->data, presp->len);
4337
4338 hdr = (struct ieee80211_hdr *) skb->data;
4339 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4340
4341 out:
4342 rcu_read_unlock();
4343 return skb;
4344 }
4345 EXPORT_SYMBOL(ieee80211_proberesp_get);
4346
4347 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4348 struct ieee80211_vif *vif)
4349 {
4350 struct ieee80211_sub_if_data *sdata;
4351 struct ieee80211_if_managed *ifmgd;
4352 struct ieee80211_pspoll *pspoll;
4353 struct ieee80211_local *local;
4354 struct sk_buff *skb;
4355
4356 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4357 return NULL;
4358
4359 sdata = vif_to_sdata(vif);
4360 ifmgd = &sdata->u.mgd;
4361 local = sdata->local;
4362
4363 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4364 if (!skb)
4365 return NULL;
4366
4367 skb_reserve(skb, local->hw.extra_tx_headroom);
4368
4369 pspoll = skb_put_zero(skb, sizeof(*pspoll));
4370 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4371 IEEE80211_STYPE_PSPOLL);
4372 pspoll->aid = cpu_to_le16(ifmgd->aid);
4373
4374 /* aid in PS-Poll has its two MSBs each set to 1 */
4375 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4376
4377 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4378 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4379
4380 return skb;
4381 }
4382 EXPORT_SYMBOL(ieee80211_pspoll_get);
4383
4384 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4385 struct ieee80211_vif *vif)
4386 {
4387 struct ieee80211_hdr_3addr *nullfunc;
4388 struct ieee80211_sub_if_data *sdata;
4389 struct ieee80211_if_managed *ifmgd;
4390 struct ieee80211_local *local;
4391 struct sk_buff *skb;
4392
4393 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4394 return NULL;
4395
4396 sdata = vif_to_sdata(vif);
4397 ifmgd = &sdata->u.mgd;
4398 local = sdata->local;
4399
4400 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
4401 if (!skb)
4402 return NULL;
4403
4404 skb_reserve(skb, local->hw.extra_tx_headroom);
4405
4406 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4407 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4408 IEEE80211_STYPE_NULLFUNC |
4409 IEEE80211_FCTL_TODS);
4410 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4411 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4412 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4413
4414 return skb;
4415 }
4416 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4417
4418 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4419 const u8 *src_addr,
4420 const u8 *ssid, size_t ssid_len,
4421 size_t tailroom)
4422 {
4423 struct ieee80211_local *local = hw_to_local(hw);
4424 struct ieee80211_hdr_3addr *hdr;
4425 struct sk_buff *skb;
4426 size_t ie_ssid_len;
4427 u8 *pos;
4428
4429 ie_ssid_len = 2 + ssid_len;
4430
4431 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4432 ie_ssid_len + tailroom);
4433 if (!skb)
4434 return NULL;
4435
4436 skb_reserve(skb, local->hw.extra_tx_headroom);
4437
4438 hdr = skb_put_zero(skb, sizeof(*hdr));
4439 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4440 IEEE80211_STYPE_PROBE_REQ);
4441 eth_broadcast_addr(hdr->addr1);
4442 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4443 eth_broadcast_addr(hdr->addr3);
4444
4445 pos = skb_put(skb, ie_ssid_len);
4446 *pos++ = WLAN_EID_SSID;
4447 *pos++ = ssid_len;
4448 if (ssid_len)
4449 memcpy(pos, ssid, ssid_len);
4450 pos += ssid_len;
4451
4452 return skb;
4453 }
4454 EXPORT_SYMBOL(ieee80211_probereq_get);
4455
4456 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4457 const void *frame, size_t frame_len,
4458 const struct ieee80211_tx_info *frame_txctl,
4459 struct ieee80211_rts *rts)
4460 {
4461 const struct ieee80211_hdr *hdr = frame;
4462
4463 rts->frame_control =
4464 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4465 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4466 frame_txctl);
4467 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4468 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4469 }
4470 EXPORT_SYMBOL(ieee80211_rts_get);
4471
4472 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4473 const void *frame, size_t frame_len,
4474 const struct ieee80211_tx_info *frame_txctl,
4475 struct ieee80211_cts *cts)
4476 {
4477 const struct ieee80211_hdr *hdr = frame;
4478
4479 cts->frame_control =
4480 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4481 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4482 frame_len, frame_txctl);
4483 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4484 }
4485 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4486
4487 struct sk_buff *
4488 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4489 struct ieee80211_vif *vif)
4490 {
4491 struct ieee80211_local *local = hw_to_local(hw);
4492 struct sk_buff *skb = NULL;
4493 struct ieee80211_tx_data tx;
4494 struct ieee80211_sub_if_data *sdata;
4495 struct ps_data *ps;
4496 struct ieee80211_tx_info *info;
4497 struct ieee80211_chanctx_conf *chanctx_conf;
4498
4499 sdata = vif_to_sdata(vif);
4500
4501 rcu_read_lock();
4502 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4503
4504 if (!chanctx_conf)
4505 goto out;
4506
4507 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4508 struct beacon_data *beacon =
4509 rcu_dereference(sdata->u.ap.beacon);
4510
4511 if (!beacon || !beacon->head)
4512 goto out;
4513
4514 ps = &sdata->u.ap.ps;
4515 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4516 ps = &sdata->u.mesh.ps;
4517 } else {
4518 goto out;
4519 }
4520
4521 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4522 goto out; /* send buffered bc/mc only after DTIM beacon */
4523
4524 while (1) {
4525 skb = skb_dequeue(&ps->bc_buf);
4526 if (!skb)
4527 goto out;
4528 local->total_ps_buffered--;
4529
4530 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4531 struct ieee80211_hdr *hdr =
4532 (struct ieee80211_hdr *) skb->data;
4533 /* more buffered multicast/broadcast frames ==> set
4534 * MoreData flag in IEEE 802.11 header to inform PS
4535 * STAs */
4536 hdr->frame_control |=
4537 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4538 }
4539
4540 if (sdata->vif.type == NL80211_IFTYPE_AP)
4541 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4542 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4543 break;
4544 ieee80211_free_txskb(hw, skb);
4545 }
4546
4547 info = IEEE80211_SKB_CB(skb);
4548
4549 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4550 info->band = chanctx_conf->def.chan->band;
4551
4552 if (invoke_tx_handlers(&tx))
4553 skb = NULL;
4554 out:
4555 rcu_read_unlock();
4556
4557 return skb;
4558 }
4559 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4560
4561 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4562 {
4563 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4564 struct ieee80211_sub_if_data *sdata = sta->sdata;
4565 struct ieee80211_local *local = sdata->local;
4566 int ret;
4567 u32 queues;
4568
4569 lockdep_assert_held(&local->sta_mtx);
4570
4571 /* only some cases are supported right now */
4572 switch (sdata->vif.type) {
4573 case NL80211_IFTYPE_STATION:
4574 case NL80211_IFTYPE_AP:
4575 case NL80211_IFTYPE_AP_VLAN:
4576 break;
4577 default:
4578 WARN_ON(1);
4579 return -EINVAL;
4580 }
4581
4582 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4583 return -EINVAL;
4584
4585 if (sta->reserved_tid == tid) {
4586 ret = 0;
4587 goto out;
4588 }
4589
4590 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4591 sdata_err(sdata, "TID reservation already active\n");
4592 ret = -EALREADY;
4593 goto out;
4594 }
4595
4596 ieee80211_stop_vif_queues(sdata->local, sdata,
4597 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4598
4599 synchronize_net();
4600
4601 /* Tear down BA sessions so we stop aggregating on this TID */
4602 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4603 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4604 __ieee80211_stop_tx_ba_session(sta, tid,
4605 AGG_STOP_LOCAL_REQUEST);
4606 }
4607
4608 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4609 __ieee80211_flush_queues(local, sdata, queues, false);
4610
4611 sta->reserved_tid = tid;
4612
4613 ieee80211_wake_vif_queues(local, sdata,
4614 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4615
4616 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4617 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4618
4619 ret = 0;
4620 out:
4621 return ret;
4622 }
4623 EXPORT_SYMBOL(ieee80211_reserve_tid);
4624
4625 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4626 {
4627 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4628 struct ieee80211_sub_if_data *sdata = sta->sdata;
4629
4630 lockdep_assert_held(&sdata->local->sta_mtx);
4631
4632 /* only some cases are supported right now */
4633 switch (sdata->vif.type) {
4634 case NL80211_IFTYPE_STATION:
4635 case NL80211_IFTYPE_AP:
4636 case NL80211_IFTYPE_AP_VLAN:
4637 break;
4638 default:
4639 WARN_ON(1);
4640 return;
4641 }
4642
4643 if (tid != sta->reserved_tid) {
4644 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4645 return;
4646 }
4647
4648 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4649 }
4650 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4651
4652 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4653 struct sk_buff *skb, int tid,
4654 enum nl80211_band band)
4655 {
4656 int ac = ieee80211_ac_from_tid(tid);
4657
4658 skb_reset_mac_header(skb);
4659 skb_set_queue_mapping(skb, ac);
4660 skb->priority = tid;
4661
4662 skb->dev = sdata->dev;
4663
4664 /*
4665 * The other path calling ieee80211_xmit is from the tasklet,
4666 * and while we can handle concurrent transmissions locking
4667 * requirements are that we do not come into tx with bhs on.
4668 */
4669 local_bh_disable();
4670 IEEE80211_SKB_CB(skb)->band = band;
4671 ieee80211_xmit(sdata, NULL, skb);
4672 local_bh_enable();
4673 }