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
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.
13 * Transmit and frame generation functions.
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>
33 #include "ieee80211_i.h"
34 #include "driver-ops.h"
44 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
46 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
48 u64_stats_update_begin(&tstats->syncp);
50 tstats->tx_bytes += len;
51 u64_stats_update_end(&tstats->syncp);
54 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
55 struct sk_buff *skb, int group_addr,
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;
67 /* assume HW handles this */
68 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
72 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
74 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
75 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
80 if (WARN_ON_ONCE(tx->rate.idx < 0))
83 sband = local->hw.wiphy->bands[info->band];
84 txrate = &sband->bitrates[tx->rate.idx];
86 erp = txrate->flags & IEEE80211_RATE_ERP_G;
89 * data and mgmt (except PS Poll):
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
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
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.
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
119 * PS Poll: BIT(15) | BIT(14) | aid
125 if (0 /* FIX: data/mgmt during CFP */)
126 return cpu_to_le16(32768);
128 if (group_addr) /* Group address as the destination - no ACK */
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
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];
147 if (r->bitrate > txrate->bitrate)
150 if ((rate_flags & r->flags) != rate_flags)
153 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
154 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
156 switch (sband->band) {
157 case NL80211_BAND_2GHZ: {
159 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
160 flag = IEEE80211_RATE_MANDATORY_G;
162 flag = IEEE80211_RATE_MANDATORY_B;
167 case NL80211_BAND_5GHZ:
168 if (r->flags & IEEE80211_RATE_MANDATORY_A)
171 case NL80211_BAND_60GHZ:
172 /* TODO, for now fall through */
173 case NUM_NL80211_BANDS:
179 /* No matching basic rate found; use highest suitable mandatory
181 rate = DIV_ROUND_UP(mrate, 1 << shift);
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)
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,
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 */
201 dur += ieee80211_frame_duration(sband->band, next_frag_len,
202 txrate->bitrate, erp,
203 tx->sdata->vif.bss_conf.use_short_preamble,
207 return cpu_to_le16(dur);
211 static ieee80211_tx_result debug_noinline
212 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
214 struct ieee80211_local *local = tx->local;
215 struct ieee80211_if_managed *ifmgd;
217 /* driver doesn't support power save */
218 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
221 /* hardware does dynamic power save */
222 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
225 /* dynamic power save disabled */
226 if (local->hw.conf.dynamic_ps_timeout <= 0)
229 /* we are scanning, don't enable power save */
233 if (!local->ps_sdata)
236 /* No point if we're going to suspend */
237 if (local->quiescing)
240 /* dynamic ps is supported only in managed mode */
241 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
244 ifmgd = &tx->sdata->u.mgd;
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
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.
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)
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,
269 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
270 ieee80211_queue_work(&local->hw,
271 &local->dynamic_ps_disable_work);
274 /* Don't restart the timer if we're not disassociated */
275 if (!ifmgd->associated)
278 mod_timer(&local->dynamic_ps_timer, jiffies +
279 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
284 static ieee80211_tx_result debug_noinline
285 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
288 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
289 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
292 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
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))
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.
308 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
312 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
315 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
318 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
322 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
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",
332 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
335 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
336 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
338 * No associated STAs - no need to send multicast
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)
353 int total = 0, purged = 0;
355 struct ieee80211_sub_if_data *sdata;
356 struct sta_info *sta;
358 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
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;
368 skb = skb_dequeue(&ps->bc_buf);
371 ieee80211_free_txskb(&local->hw, skb);
373 total += skb_queue_len(&ps->bc_buf);
377 * Drop one frame from each station from the lowest-priority
378 * AC that has frames at all.
380 list_for_each_entry_rcu(sta, &local->sta_list, list) {
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]);
388 ieee80211_free_txskb(&local->hw, skb);
394 local->total_ps_buffered = total;
395 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
398 static ieee80211_tx_result
399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
406 * broadcast/multicast frame
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.
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) {
419 ps = &tx->sdata->bss->ps;
420 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
421 ps = &tx->sdata->u.mesh.ps;
427 /* no buffering for ordered frames */
428 if (ieee80211_has_order(hdr->frame_control))
431 if (ieee80211_is_probe_req(hdr->frame_control))
434 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
435 info->hw_queue = tx->sdata->vif.cab_queue;
437 /* no stations in PS mode */
438 if (!atomic_read(&ps->num_sta_ps))
441 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
443 /* device releases frame after DTIM beacon */
444 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
447 /* buffered in mac80211 */
448 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
449 purge_old_ps_buffers(tx->local);
451 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
453 "BC TX buffer full - dropping the oldest frame\n");
454 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
456 tx->local->total_ps_buffered++;
458 skb_queue_tail(&ps->bc_buf, tx->skb);
463 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
466 if (!ieee80211_is_mgmt(fc))
469 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
472 if (!ieee80211_is_robust_mgmt_frame(skb))
478 static ieee80211_tx_result
479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
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;
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);
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;
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);
506 /* sync with ieee80211_sta_ps_deliver_wakeup */
507 spin_lock(&sta->ps_lock);
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.
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);
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]);
523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
525 ieee80211_free_txskb(&local->hw, old);
527 tx->local->total_ps_buffered++;
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);
536 if (!timer_pending(&local->sta_cleanup))
537 mod_timer(&local->sta_cleanup,
538 round_jiffies(jiffies +
539 STA_INFO_CLEANUP_INTERVAL));
542 * We queued up some frames, so the TIM bit might
543 * need to be set, recalculate it.
545 sta_info_recalc_tim(sta);
548 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
550 "STA %pM in PS mode, but polling/in SP -> send frame\n",
557 static ieee80211_tx_result debug_noinline
558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
560 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
563 if (tx->flags & IEEE80211_TX_UNICAST)
564 return ieee80211_tx_h_unicast_ps_buf(tx);
566 return ieee80211_tx_h_multicast_ps_buf(tx);
569 static ieee80211_tx_result debug_noinline
570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
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;
584 static ieee80211_tx_result debug_noinline
585 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
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;
591 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
594 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
596 else if (ieee80211_is_group_privacy_action(tx->skb) &&
597 (key = rcu_dereference(tx->sdata->default_multicast_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)))
604 else if (is_multicast_ether_addr(hdr->addr1) &&
605 (key = rcu_dereference(tx->sdata->default_multicast_key)))
607 else if (!is_multicast_ether_addr(hdr->addr1) &&
608 (key = rcu_dereference(tx->sdata->default_unicast_key)))
614 bool skip_hw = false;
616 /* TODO: add threshold stuff again */
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))
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,
632 !ieee80211_is_group_privacy_action(tx->skb))
635 skip_hw = (tx->key->conf.flags &
636 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
637 ieee80211_is_mgmt(hdr->frame_control);
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))
648 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
649 !ieee80211_is_deauth(hdr->frame_control)))
652 if (!skip_hw && tx->key &&
653 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
654 info->control.hw_key = &tx->key->conf;
660 static ieee80211_tx_result debug_noinline
661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
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;
667 struct ieee80211_tx_rate_control txrc;
668 struct ieee80211_sta_rates *ratetbl = NULL;
671 memset(&txrc, 0, sizeof(txrc));
673 sband = tx->local->hw.wiphy->bands[info->band];
675 len = min_t(u32, tx->skb->len + FCS_LEN,
676 tx->local->hw.wiphy->frag_threshold);
678 /* set up the tx rate control struct we give the RC algo */
679 txrc.hw = &tx->local->hw;
681 txrc.bss_conf = &tx->sdata->vif.bss_conf;
683 txrc.reported_rate.idx = -1;
684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
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];
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);
695 /* set up RTS protection if desired */
696 if (len > tx->local->hw.wiphy->rts_threshold) {
700 info->control.use_rts = txrc.rts;
701 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
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.
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;
714 info->control.short_preamble = txrc.short_preamble;
716 /* don't ask rate control when rate already injected via radiotap */
717 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
721 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
724 * Lets not bother rate control if we're associated and cannot
725 * talk to the sta. This should not happen.
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,
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.
740 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
742 if (tx->sta && !info->control.skip_table)
743 ratetbl = rcu_dereference(tx->sta->sta.rates);
745 if (unlikely(info->control.rates[0].idx < 0)) {
747 struct ieee80211_tx_rate rate = {
748 .idx = ratetbl->rate[0].idx,
749 .flags = ratetbl->rate[0].flags,
750 .count = ratetbl->rate[0].count
753 if (ratetbl->rate[0].idx < 0)
761 tx->rate = info->control.rates[0];
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;
769 tx->sta->tx_stats.last_rate = txrc.reported_rate;
774 if (unlikely(!info->control.rates[0].count))
775 info->control.rates[0].count = 1;
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;
784 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
786 u16 *seq = &sta->tid_seq[tid];
787 __le16 ret = cpu_to_le16(*seq);
789 /* Increase the sequence number. */
790 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
795 static ieee80211_tx_result debug_noinline
796 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
798 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
799 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
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.
808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
811 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
814 if (ieee80211_hdrlen(hdr->frame_control) < 24)
817 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
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).
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;
834 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
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.
846 /* include per-STA, per-TID sequence counter */
848 qc = ieee80211_get_qos_ctl(hdr);
849 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
850 tx->sta->tx_stats.msdu[tid]++;
852 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
857 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
858 struct sk_buff *skb, int hdrlen,
861 struct ieee80211_local *local = tx->local;
862 struct ieee80211_tx_info *info;
864 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
865 int pos = hdrlen + per_fragm;
866 int rem = skb->len - hdrlen - per_fragm;
868 if (WARN_ON(rem < 0))
871 /* first fragment was already added to queue by caller */
874 int fraglen = per_fragm;
879 tmp = dev_alloc_skb(local->tx_headroom +
881 tx->sdata->encrypt_headroom +
882 IEEE80211_ENCRYPT_TAILROOM);
886 __skb_queue_tail(&tx->skbs, tmp);
889 local->tx_headroom + tx->sdata->encrypt_headroom);
891 /* copy control information */
892 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
894 info = IEEE80211_SKB_CB(tmp);
895 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
896 IEEE80211_TX_CTL_FIRST_FRAGMENT);
899 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
901 skb_copy_queue_mapping(tmp, skb);
902 tmp->priority = skb->priority;
905 /* copy header and data */
906 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
907 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
912 /* adjust first fragment's length */
913 skb_trim(skb, hdrlen + per_fragm);
917 static ieee80211_tx_result debug_noinline
918 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
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;
927 /* no matter what happens, tx->skb moves to tx->skbs */
928 __skb_queue_tail(&tx->skbs, skb);
931 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
934 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
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.
942 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
945 hdrlen = ieee80211_hdrlen(hdr->frame_control);
947 /* internal error, why isn't DONTFRAG set? */
948 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
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.
959 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
962 /* update duration/seq/flags of fragments */
965 skb_queue_walk(&tx->skbs, skb) {
966 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
968 hdr = (void *)skb->data;
969 info = IEEE80211_SKB_CB(skb);
971 if (!skb_queue_is_last(&tx->skbs, skb)) {
972 hdr->frame_control |= morefrags;
974 * No multi-rate retries for fragmented frames, that
975 * would completely throw off the NAV at other STAs.
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;
983 hdr->frame_control &= ~morefrags;
985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
992 static ieee80211_tx_result debug_noinline
993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1001 skb_queue_walk(&tx->skbs, skb) {
1002 ac = skb_get_queue_mapping(skb);
1003 tx->sta->tx_stats.bytes[ac] += skb->len;
1006 tx->sta->tx_stats.packets[ac]++;
1011 static ieee80211_tx_result debug_noinline
1012 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
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);
1040 return ieee80211_crypto_hw_encrypt(tx);
1046 static ieee80211_tx_result debug_noinline
1047 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1049 struct sk_buff *skb;
1050 struct ieee80211_hdr *hdr;
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;
1063 group_addr = is_multicast_ether_addr(hdr->addr1);
1066 ieee80211_duration(tx, skb, group_addr, next_len);
1072 /* actual transmit path */
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,
1080 bool queued = false;
1081 bool reset_agg_timer = false;
1082 struct sk_buff *purge_skb = NULL;
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)) {
1089 * nothing -- this aggregation session is being started
1090 * but that might still fail with the driver
1092 } else if (!tx->sta->sta.txq[tid]) {
1093 spin_lock(&tx->sta->lock);
1095 * Need to re-check now, because we may get here
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.
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.
1112 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
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;
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);
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);
1134 spin_unlock(&tx->sta->lock);
1137 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1140 /* reset session timer */
1141 if (reset_agg_timer && tid_tx->timeout)
1142 tid_tx->last_tx = jiffies;
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
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)
1157 struct ieee80211_local *local = sdata->local;
1158 struct ieee80211_hdr *hdr;
1159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1163 memset(tx, 0, sizeof(*tx));
1167 __skb_queue_head_init(&tx->skbs);
1170 * If this flag is set to true anywhere, and we get here,
1171 * we are doing the needed processing, so remove the flag
1174 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1176 hdr = (struct ieee80211_hdr *) skb->data;
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)
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);
1191 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1192 tx->sta = sta_info_get(sdata, hdr->addr1);
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;
1201 qc = ieee80211_get_qos_ctl(hdr);
1202 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1204 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1208 queued = ieee80211_tx_prep_agg(tx, skb, info,
1211 if (unlikely(queued))
1216 if (is_multicast_ether_addr(hdr->addr1)) {
1217 tx->flags &= ~IEEE80211_TX_UNICAST;
1218 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1220 tx->flags |= IEEE80211_TX_UNICAST;
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;
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);
1236 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
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)
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;
1250 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1251 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1254 if (!ieee80211_is_data(hdr->frame_control))
1258 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1263 txq = sta->sta.txq[tid];
1271 return to_txq_info(txq);
1274 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1276 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1279 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi)
1281 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif;
1284 static u32 codel_skb_len_func(const struct sk_buff *skb)
1289 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1291 const struct ieee80211_tx_info *info;
1293 info = (const struct ieee80211_tx_info *)skb->cb;
1294 return info->control.enqueue_time;
1297 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1300 struct ieee80211_local *local;
1301 struct txq_info *txqi;
1303 struct fq_flow *flow;
1306 local = vif_to_sdata(txqi->txq.vif)->local;
1309 if (cvars == &txqi->def_cvars)
1310 flow = &txqi->def_flow;
1312 flow = &fq->flows[cvars - local->cvars];
1314 return fq_flow_dequeue(fq, flow);
1317 static void codel_drop_func(struct sk_buff *skb,
1320 struct ieee80211_local *local;
1321 struct ieee80211_hw *hw;
1322 struct txq_info *txqi;
1325 local = vif_to_sdata(txqi->txq.vif)->local;
1328 ieee80211_free_txskb(hw, skb);
1331 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1333 struct fq_flow *flow)
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;
1341 local = container_of(fq, struct ieee80211_local, fq);
1342 txqi = container_of(tin, struct txq_info, tin);
1343 cparams = &local->cparams;
1344 cstats = &txqi->cstats;
1346 if (flow == &txqi->def_flow)
1347 cvars = &txqi->def_cvars;
1349 cvars = &local->cvars[flow - fq->flows];
1351 return codel_dequeue(txqi,
1357 codel_skb_time_func,
1359 codel_dequeue_func);
1362 static void fq_skb_free_func(struct fq *fq,
1364 struct fq_flow *flow,
1365 struct sk_buff *skb)
1367 struct ieee80211_local *local;
1369 local = container_of(fq, struct ieee80211_local, fq);
1370 ieee80211_free_txskb(&local->hw, skb);
1373 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1376 struct sk_buff *skb)
1378 struct txq_info *txqi;
1380 txqi = container_of(tin, struct txq_info, tin);
1381 return &txqi->def_flow;
1384 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1385 struct txq_info *txqi,
1386 struct sk_buff *skb)
1388 struct fq *fq = &local->fq;
1389 struct fq_tin *tin = &txqi->tin;
1391 ieee80211_set_skb_enqueue_time(skb);
1392 fq_tin_enqueue(fq, tin, skb,
1394 fq_flow_get_default_func);
1397 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1398 struct sta_info *sta,
1399 struct txq_info *txqi, int tid)
1401 fq_tin_init(&txqi->tin);
1402 fq_flow_init(&txqi->def_flow);
1403 codel_vars_init(&txqi->def_cvars);
1404 codel_stats_init(&txqi->cstats);
1405 __skb_queue_head_init(&txqi->frags);
1407 txqi->txq.vif = &sdata->vif;
1410 txqi->txq.sta = &sta->sta;
1411 sta->sta.txq[tid] = &txqi->txq;
1412 txqi->txq.tid = tid;
1413 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1415 sdata->vif.txq = &txqi->txq;
1417 txqi->txq.ac = IEEE80211_AC_BE;
1421 void ieee80211_txq_purge(struct ieee80211_local *local,
1422 struct txq_info *txqi)
1424 struct fq *fq = &local->fq;
1425 struct fq_tin *tin = &txqi->tin;
1427 fq_tin_reset(fq, tin, fq_skb_free_func);
1428 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1431 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1433 struct fq *fq = &local->fq;
1436 bool supp_vht = false;
1437 enum nl80211_band band;
1439 if (!local->ops->wake_tx_queue)
1442 ret = fq_init(fq, 4096);
1447 * If the hardware doesn't support VHT, it is safe to limit the maximum
1448 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1450 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1451 struct ieee80211_supported_band *sband;
1453 sband = local->hw.wiphy->bands[band];
1457 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1461 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1463 codel_params_init(&local->cparams);
1464 local->cparams.interval = MS2TIME(100);
1465 local->cparams.target = MS2TIME(20);
1466 local->cparams.ecn = true;
1468 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1470 if (!local->cvars) {
1471 spin_lock_bh(&fq->lock);
1472 fq_reset(fq, fq_skb_free_func);
1473 spin_unlock_bh(&fq->lock);
1477 for (i = 0; i < fq->flows_cnt; i++)
1478 codel_vars_init(&local->cvars[i]);
1483 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1485 struct fq *fq = &local->fq;
1487 if (!local->ops->wake_tx_queue)
1490 kfree(local->cvars);
1491 local->cvars = NULL;
1493 spin_lock_bh(&fq->lock);
1494 fq_reset(fq, fq_skb_free_func);
1495 spin_unlock_bh(&fq->lock);
1498 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1499 struct ieee80211_sub_if_data *sdata,
1500 struct sta_info *sta,
1501 struct sk_buff *skb)
1503 struct fq *fq = &local->fq;
1504 struct ieee80211_vif *vif;
1505 struct txq_info *txqi;
1507 if (!local->ops->wake_tx_queue ||
1508 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1511 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1512 sdata = container_of(sdata->bss,
1513 struct ieee80211_sub_if_data, u.ap);
1516 txqi = ieee80211_get_txq(local, vif, sta, skb);
1521 spin_lock_bh(&fq->lock);
1522 ieee80211_txq_enqueue(local, txqi, skb);
1523 spin_unlock_bh(&fq->lock);
1525 drv_wake_tx_queue(local, txqi);
1530 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1531 struct ieee80211_vif *vif,
1532 struct ieee80211_sta *sta,
1533 struct sk_buff_head *skbs,
1536 struct ieee80211_tx_control control = {};
1537 struct sk_buff *skb, *tmp;
1538 unsigned long flags;
1540 skb_queue_walk_safe(skbs, skb, tmp) {
1541 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1542 int q = info->hw_queue;
1544 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1545 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1546 __skb_unlink(skb, skbs);
1547 ieee80211_free_txskb(&local->hw, skb);
1552 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1553 if (local->queue_stop_reasons[q] ||
1554 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1555 if (unlikely(info->flags &
1556 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1557 if (local->queue_stop_reasons[q] &
1558 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1560 * Drop off-channel frames if queues
1561 * are stopped for any reason other
1562 * than off-channel operation. Never
1565 spin_unlock_irqrestore(
1566 &local->queue_stop_reason_lock,
1568 ieee80211_purge_tx_queue(&local->hw,
1575 * Since queue is stopped, queue up frames for
1576 * later transmission from the tx-pending
1577 * tasklet when the queue is woken again.
1580 skb_queue_splice_init(skbs,
1581 &local->pending[q]);
1583 skb_queue_splice_tail_init(skbs,
1584 &local->pending[q]);
1586 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1591 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1593 info->control.vif = vif;
1596 __skb_unlink(skb, skbs);
1597 drv_tx(local, &control, skb);
1604 * Returns false if the frame couldn't be transmitted but was queued instead.
1606 static bool __ieee80211_tx(struct ieee80211_local *local,
1607 struct sk_buff_head *skbs, int led_len,
1608 struct sta_info *sta, bool txpending)
1610 struct ieee80211_tx_info *info;
1611 struct ieee80211_sub_if_data *sdata;
1612 struct ieee80211_vif *vif;
1613 struct ieee80211_sta *pubsta;
1614 struct sk_buff *skb;
1618 if (WARN_ON(skb_queue_empty(skbs)))
1621 skb = skb_peek(skbs);
1622 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1623 info = IEEE80211_SKB_CB(skb);
1624 sdata = vif_to_sdata(info->control.vif);
1625 if (sta && !sta->uploaded)
1633 switch (sdata->vif.type) {
1634 case NL80211_IFTYPE_MONITOR:
1635 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1639 sdata = rcu_dereference(local->monitor_sdata);
1643 vif->hw_queue[skb_get_queue_mapping(skb)];
1644 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1645 ieee80211_purge_tx_queue(&local->hw, skbs);
1650 case NL80211_IFTYPE_AP_VLAN:
1651 sdata = container_of(sdata->bss,
1652 struct ieee80211_sub_if_data, u.ap);
1659 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1662 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1664 WARN_ON_ONCE(!skb_queue_empty(skbs));
1670 * Invoke TX handlers, return 0 on success and non-zero if the
1671 * frame was dropped or queued.
1673 * The handlers are split into an early and late part. The latter is everything
1674 * that can be sensitive to reordering, and will be deferred to after packets
1675 * are dequeued from the intermediate queues (when they are enabled).
1677 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1679 ieee80211_tx_result res = TX_DROP;
1681 #define CALL_TXH(txh) \
1684 if (res != TX_CONTINUE) \
1688 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1689 CALL_TXH(ieee80211_tx_h_check_assoc);
1690 CALL_TXH(ieee80211_tx_h_ps_buf);
1691 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1692 CALL_TXH(ieee80211_tx_h_select_key);
1693 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1694 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1697 if (unlikely(res == TX_DROP)) {
1698 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1700 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1702 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1704 } else if (unlikely(res == TX_QUEUED)) {
1705 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1713 * Late handlers can be called while the sta lock is held. Handlers that can
1714 * cause packets to be generated will cause deadlock!
1716 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1718 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1719 ieee80211_tx_result res = TX_CONTINUE;
1721 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1722 __skb_queue_tail(&tx->skbs, tx->skb);
1727 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1728 CALL_TXH(ieee80211_tx_h_sequence);
1729 CALL_TXH(ieee80211_tx_h_fragment);
1730 /* handlers after fragment must be aware of tx info fragmentation! */
1731 CALL_TXH(ieee80211_tx_h_stats);
1732 CALL_TXH(ieee80211_tx_h_encrypt);
1733 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1734 CALL_TXH(ieee80211_tx_h_calculate_duration);
1738 if (unlikely(res == TX_DROP)) {
1739 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1741 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1743 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1745 } else if (unlikely(res == TX_QUEUED)) {
1746 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1753 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1755 int r = invoke_tx_handlers_early(tx);
1759 return invoke_tx_handlers_late(tx);
1762 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1763 struct ieee80211_vif *vif, struct sk_buff *skb,
1764 int band, struct ieee80211_sta **sta)
1766 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1767 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1768 struct ieee80211_tx_data tx;
1769 struct sk_buff *skb2;
1771 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1775 info->control.vif = vif;
1776 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1778 if (invoke_tx_handlers(&tx))
1783 *sta = &tx.sta->sta;
1788 /* this function isn't suitable for fragmented data frames */
1789 skb2 = __skb_dequeue(&tx.skbs);
1790 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1791 ieee80211_free_txskb(hw, skb2);
1792 ieee80211_purge_tx_queue(hw, &tx.skbs);
1798 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1801 * Returns false if the frame couldn't be transmitted but was queued instead.
1803 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1804 struct sta_info *sta, struct sk_buff *skb,
1807 struct ieee80211_local *local = sdata->local;
1808 struct ieee80211_tx_data tx;
1809 ieee80211_tx_result res_prepare;
1810 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1814 if (unlikely(skb->len < 10)) {
1819 /* initialises tx */
1821 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1823 if (unlikely(res_prepare == TX_DROP)) {
1824 ieee80211_free_txskb(&local->hw, skb);
1826 } else if (unlikely(res_prepare == TX_QUEUED)) {
1830 /* set up hw_queue value early */
1831 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1832 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1834 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1836 if (invoke_tx_handlers_early(&tx))
1839 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1842 if (!invoke_tx_handlers_late(&tx))
1843 result = __ieee80211_tx(local, &tx.skbs, led_len,
1849 /* device xmit handlers */
1851 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1852 struct sk_buff *skb,
1853 int head_need, bool may_encrypt)
1855 struct ieee80211_local *local = sdata->local;
1858 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1859 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1860 tail_need -= skb_tailroom(skb);
1861 tail_need = max_t(int, tail_need, 0);
1864 if (skb_cloned(skb) &&
1865 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1866 !skb_clone_writable(skb, ETH_HLEN) ||
1867 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1868 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1869 else if (head_need || tail_need)
1870 I802_DEBUG_INC(local->tx_expand_skb_head);
1874 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1875 wiphy_debug(local->hw.wiphy,
1876 "failed to reallocate TX buffer\n");
1883 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1884 struct sta_info *sta, struct sk_buff *skb)
1886 struct ieee80211_local *local = sdata->local;
1887 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1888 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1892 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1894 headroom = local->tx_headroom;
1896 headroom += sdata->encrypt_headroom;
1897 headroom -= skb_headroom(skb);
1898 headroom = max_t(int, 0, headroom);
1900 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1901 ieee80211_free_txskb(&local->hw, skb);
1905 hdr = (struct ieee80211_hdr *) skb->data;
1906 info->control.vif = &sdata->vif;
1908 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1909 if (ieee80211_is_data(hdr->frame_control) &&
1910 is_unicast_ether_addr(hdr->addr1)) {
1911 if (mesh_nexthop_resolve(sdata, skb))
1912 return; /* skb queued: don't free */
1914 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1918 ieee80211_set_qos_hdr(sdata, skb);
1919 ieee80211_tx(sdata, sta, skb, false);
1922 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1923 struct sk_buff *skb)
1925 struct ieee80211_radiotap_iterator iterator;
1926 struct ieee80211_radiotap_header *rthdr =
1927 (struct ieee80211_radiotap_header *) skb->data;
1928 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1929 struct ieee80211_supported_band *sband =
1930 local->hw.wiphy->bands[info->band];
1931 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1935 bool rate_found = false;
1936 u8 rate_retries = 0;
1938 u8 mcs_known, mcs_flags, mcs_bw;
1940 u8 vht_mcs = 0, vht_nss = 0;
1943 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1944 IEEE80211_TX_CTL_DONTFRAG;
1947 * for every radiotap entry that is present
1948 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1949 * entries present, or -EINVAL on error)
1953 ret = ieee80211_radiotap_iterator_next(&iterator);
1958 /* see if this argument is something we can use */
1959 switch (iterator.this_arg_index) {
1961 * You must take care when dereferencing iterator.this_arg
1962 * for multibyte types... the pointer is not aligned. Use
1963 * get_unaligned((type *)iterator.this_arg) to dereference
1964 * iterator.this_arg for type "type" safely on all arches.
1966 case IEEE80211_RADIOTAP_FLAGS:
1967 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1969 * this indicates that the skb we have been
1970 * handed has the 32-bit FCS CRC at the end...
1971 * we should react to that by snipping it off
1972 * because it will be recomputed and added
1975 if (skb->len < (iterator._max_length + FCS_LEN))
1978 skb_trim(skb, skb->len - FCS_LEN);
1980 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1981 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1982 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1983 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1986 case IEEE80211_RADIOTAP_TX_FLAGS:
1987 txflags = get_unaligned_le16(iterator.this_arg);
1988 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1989 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1992 case IEEE80211_RADIOTAP_RATE:
1993 rate = *iterator.this_arg;
1998 case IEEE80211_RADIOTAP_DATA_RETRIES:
1999 rate_retries = *iterator.this_arg;
2002 case IEEE80211_RADIOTAP_MCS:
2003 mcs_known = iterator.this_arg[0];
2004 mcs_flags = iterator.this_arg[1];
2005 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2009 rate = iterator.this_arg[2];
2010 rate_flags = IEEE80211_TX_RC_MCS;
2012 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2013 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2014 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2016 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2017 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2018 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2019 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2022 case IEEE80211_RADIOTAP_VHT:
2023 vht_known = get_unaligned_le16(iterator.this_arg);
2026 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2027 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2028 (iterator.this_arg[2] &
2029 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2030 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2032 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2033 if (iterator.this_arg[3] == 1)
2035 IEEE80211_TX_RC_40_MHZ_WIDTH;
2036 else if (iterator.this_arg[3] == 4)
2038 IEEE80211_TX_RC_80_MHZ_WIDTH;
2039 else if (iterator.this_arg[3] == 11)
2041 IEEE80211_TX_RC_160_MHZ_WIDTH;
2044 vht_mcs = iterator.this_arg[4] >> 4;
2045 vht_nss = iterator.this_arg[4] & 0xF;
2049 * Please update the file
2050 * Documentation/networking/mac80211-injection.txt
2051 * when parsing new fields here.
2059 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2063 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2065 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2066 info->control.rates[i].idx = -1;
2067 info->control.rates[i].flags = 0;
2068 info->control.rates[i].count = 0;
2071 if (rate_flags & IEEE80211_TX_RC_MCS) {
2072 info->control.rates[0].idx = rate;
2073 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2074 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2077 for (i = 0; i < sband->n_bitrates; i++) {
2078 if (rate * 5 != sband->bitrates[i].bitrate)
2081 info->control.rates[0].idx = i;
2086 if (info->control.rates[0].idx < 0)
2087 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2089 info->control.rates[0].flags = rate_flags;
2090 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2091 local->hw.max_rate_tries);
2095 * remove the radiotap header
2096 * iterator->_max_length was sanity-checked against
2097 * skb->len by iterator init
2099 skb_pull(skb, iterator._max_length);
2104 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2105 struct net_device *dev)
2107 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2108 struct ieee80211_chanctx_conf *chanctx_conf;
2109 struct ieee80211_radiotap_header *prthdr =
2110 (struct ieee80211_radiotap_header *)skb->data;
2111 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2112 struct ieee80211_hdr *hdr;
2113 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2114 struct cfg80211_chan_def *chandef;
2118 /* check for not even having the fixed radiotap header part */
2119 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2120 goto fail; /* too short to be possibly valid */
2122 /* is it a header version we can trust to find length from? */
2123 if (unlikely(prthdr->it_version))
2124 goto fail; /* only version 0 is supported */
2126 /* then there must be a radiotap header with a length we can use */
2127 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2129 /* does the skb contain enough to deliver on the alleged length? */
2130 if (unlikely(skb->len < len_rthdr))
2131 goto fail; /* skb too short for claimed rt header extent */
2134 * fix up the pointers accounting for the radiotap
2135 * header still being in there. We are being given
2136 * a precooked IEEE80211 header so no need for
2139 skb_set_mac_header(skb, len_rthdr);
2141 * these are just fixed to the end of the rt area since we
2142 * don't have any better information and at this point, nobody cares
2144 skb_set_network_header(skb, len_rthdr);
2145 skb_set_transport_header(skb, len_rthdr);
2147 if (skb->len < len_rthdr + 2)
2150 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2151 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2153 if (skb->len < len_rthdr + hdrlen)
2157 * Initialize skb->protocol if the injected frame is a data frame
2158 * carrying a rfc1042 header
2160 if (ieee80211_is_data(hdr->frame_control) &&
2161 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2162 u8 *payload = (u8 *)hdr + hdrlen;
2164 if (ether_addr_equal(payload, rfc1042_header))
2165 skb->protocol = cpu_to_be16((payload[6] << 8) |
2169 memset(info, 0, sizeof(*info));
2171 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2172 IEEE80211_TX_CTL_INJECTED;
2177 * We process outgoing injected frames that have a local address
2178 * we handle as though they are non-injected frames.
2179 * This code here isn't entirely correct, the local MAC address
2180 * isn't always enough to find the interface to use; for proper
2181 * VLAN/WDS support we will need a different mechanism (which
2182 * likely isn't going to be monitor interfaces).
2184 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2186 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2187 if (!ieee80211_sdata_running(tmp_sdata))
2189 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2190 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2191 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2193 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2199 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2200 if (!chanctx_conf) {
2201 tmp_sdata = rcu_dereference(local->monitor_sdata);
2204 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2208 chandef = &chanctx_conf->def;
2209 else if (!local->use_chanctx)
2210 chandef = &local->_oper_chandef;
2215 * Frame injection is not allowed if beaconing is not allowed
2216 * or if we need radar detection. Beaconing is usually not allowed when
2217 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2218 * Passive scan is also used in world regulatory domains where
2219 * your country is not known and as such it should be treated as
2220 * NO TX unless the channel is explicitly allowed in which case
2221 * your current regulatory domain would not have the passive scan
2224 * Since AP mode uses monitor interfaces to inject/TX management
2225 * frames we can make AP mode the exception to this rule once it
2226 * supports radar detection as its implementation can deal with
2227 * radar detection by itself. We can do that later by adding a
2228 * monitor flag interfaces used for AP support.
2230 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2234 info->band = chandef->chan->band;
2236 /* process and remove the injection radiotap header */
2237 if (!ieee80211_parse_tx_radiotap(local, skb))
2240 ieee80211_xmit(sdata, NULL, skb);
2243 return NETDEV_TX_OK;
2249 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2252 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2254 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2256 return ethertype == ETH_P_TDLS &&
2258 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2261 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2262 struct sk_buff *skb,
2263 struct sta_info **sta_out)
2265 struct sta_info *sta;
2267 switch (sdata->vif.type) {
2268 case NL80211_IFTYPE_AP_VLAN:
2269 sta = rcu_dereference(sdata->u.vlan.sta);
2273 } else if (sdata->wdev.use_4addr) {
2277 case NL80211_IFTYPE_AP:
2278 case NL80211_IFTYPE_OCB:
2279 case NL80211_IFTYPE_ADHOC:
2280 if (is_multicast_ether_addr(skb->data)) {
2281 *sta_out = ERR_PTR(-ENOENT);
2284 sta = sta_info_get_bss(sdata, skb->data);
2286 case NL80211_IFTYPE_WDS:
2287 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2289 #ifdef CONFIG_MAC80211_MESH
2290 case NL80211_IFTYPE_MESH_POINT:
2291 /* determined much later */
2295 case NL80211_IFTYPE_STATION:
2296 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2297 sta = sta_info_get(sdata, skb->data);
2298 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2299 if (test_sta_flag(sta,
2300 WLAN_STA_TDLS_PEER_AUTH)) {
2306 * TDLS link during setup - throw out frames to
2307 * peer. Allow TDLS-setup frames to unauthorized
2308 * peers for the special case of a link teardown
2309 * after a TDLS sta is removed due to being
2312 if (!ieee80211_is_tdls_setup(skb))
2318 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2326 *sta_out = sta ?: ERR_PTR(-ENOENT);
2331 * ieee80211_build_hdr - build 802.11 header in the given frame
2332 * @sdata: virtual interface to build the header for
2333 * @skb: the skb to build the header in
2334 * @info_flags: skb flags to set
2336 * This function takes the skb with 802.3 header and reformats the header to
2337 * the appropriate IEEE 802.11 header based on which interface the packet is
2338 * being transmitted on.
2340 * Note that this function also takes care of the TX status request and
2341 * potential unsharing of the SKB - this needs to be interleaved with the
2344 * The function requires the read-side RCU lock held
2346 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2348 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2349 struct sk_buff *skb, u32 info_flags,
2350 struct sta_info *sta)
2352 struct ieee80211_local *local = sdata->local;
2353 struct ieee80211_tx_info *info;
2355 u16 ethertype, hdrlen, meshhdrlen = 0;
2357 struct ieee80211_hdr hdr;
2358 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2359 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2360 const u8 *encaps_data;
2361 int encaps_len, skip_header_bytes;
2362 bool wme_sta = false, authorized = false;
2366 struct ieee80211_chanctx_conf *chanctx_conf;
2367 struct ieee80211_sub_if_data *ap_sdata;
2368 enum nl80211_band band;
2374 /* convert Ethernet header to proper 802.11 header (based on
2375 * operation mode) */
2376 ethertype = (skb->data[12] << 8) | skb->data[13];
2377 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2379 switch (sdata->vif.type) {
2380 case NL80211_IFTYPE_AP_VLAN:
2381 if (sdata->wdev.use_4addr) {
2382 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2384 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2385 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2386 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2387 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2389 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2390 wme_sta = sta->sta.wme;
2392 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2394 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2395 if (!chanctx_conf) {
2399 band = chanctx_conf->def.chan->band;
2400 if (sdata->wdev.use_4addr)
2403 case NL80211_IFTYPE_AP:
2404 if (sdata->vif.type == NL80211_IFTYPE_AP)
2405 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2406 if (!chanctx_conf) {
2410 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2412 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2413 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2414 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2416 band = chanctx_conf->def.chan->band;
2418 case NL80211_IFTYPE_WDS:
2419 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2421 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2422 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2423 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2424 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2427 * This is the exception! WDS style interfaces are prohibited
2428 * when channel contexts are in used so this must be valid
2430 band = local->hw.conf.chandef.chan->band;
2432 #ifdef CONFIG_MAC80211_MESH
2433 case NL80211_IFTYPE_MESH_POINT:
2434 if (!is_multicast_ether_addr(skb->data)) {
2435 struct sta_info *next_hop;
2436 bool mpp_lookup = true;
2438 mpath = mesh_path_lookup(sdata, skb->data);
2441 next_hop = rcu_dereference(mpath->next_hop);
2443 !(mpath->flags & (MESH_PATH_ACTIVE |
2444 MESH_PATH_RESOLVING)))
2449 mppath = mpp_path_lookup(sdata, skb->data);
2451 mppath->exp_time = jiffies;
2454 if (mppath && mpath)
2455 mesh_path_del(sdata, mpath->dst);
2459 * Use address extension if it is a packet from
2460 * another interface or if we know the destination
2461 * is being proxied by a portal (i.e. portal address
2462 * differs from proxied address)
2464 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2465 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2466 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2467 skb->data, skb->data + ETH_ALEN);
2468 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2471 /* DS -> MBSS (802.11-2012 13.11.3.3).
2472 * For unicast with unknown forwarding information,
2473 * destination might be in the MBSS or if that fails
2474 * forwarded to another mesh gate. In either case
2475 * resolution will be handled in ieee80211_xmit(), so
2476 * leave the original DA. This also works for mcast */
2477 const u8 *mesh_da = skb->data;
2480 mesh_da = mppath->mpp;
2482 mesh_da = mpath->dst;
2484 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2485 mesh_da, sdata->vif.addr);
2486 if (is_multicast_ether_addr(mesh_da))
2487 /* DA TA mSA AE:SA */
2488 meshhdrlen = ieee80211_new_mesh_header(
2490 skb->data + ETH_ALEN, NULL);
2492 /* RA TA mDA mSA AE:DA SA */
2493 meshhdrlen = ieee80211_new_mesh_header(
2494 sdata, &mesh_hdr, skb->data,
2495 skb->data + ETH_ALEN);
2498 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2499 if (!chanctx_conf) {
2503 band = chanctx_conf->def.chan->band;
2506 case NL80211_IFTYPE_STATION:
2507 /* we already did checks when looking up the RA STA */
2508 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2512 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2513 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2514 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2516 } else if (sdata->u.mgd.use_4addr &&
2517 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2518 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2519 IEEE80211_FCTL_TODS);
2521 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2522 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2523 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2524 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2527 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2529 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2530 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2531 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2534 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2535 if (!chanctx_conf) {
2539 band = chanctx_conf->def.chan->band;
2541 case NL80211_IFTYPE_OCB:
2543 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2544 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2545 eth_broadcast_addr(hdr.addr3);
2547 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2548 if (!chanctx_conf) {
2552 band = chanctx_conf->def.chan->band;
2554 case NL80211_IFTYPE_ADHOC:
2556 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2557 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2558 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2560 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2561 if (!chanctx_conf) {
2565 band = chanctx_conf->def.chan->band;
2572 multicast = is_multicast_ether_addr(hdr.addr1);
2574 /* sta is always NULL for mesh */
2576 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2577 wme_sta = sta->sta.wme;
2578 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2579 /* For mesh, the use of the QoS header is mandatory */
2583 /* receiver does QoS (which also means we do) use it */
2585 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2590 * Drop unicast frames to unauthorised stations unless they are
2591 * EAPOL frames from the local station.
2593 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2594 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2595 !multicast && !authorized &&
2596 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2597 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2598 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2599 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2600 sdata->name, hdr.addr1);
2603 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2609 if (unlikely(!multicast && skb->sk &&
2610 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2611 struct sk_buff *ack_skb = skb_clone_sk(skb);
2614 unsigned long flags;
2617 spin_lock_irqsave(&local->ack_status_lock, flags);
2618 id = idr_alloc(&local->ack_status_frames, ack_skb,
2619 1, 0x10000, GFP_ATOMIC);
2620 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2624 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2632 * If the skb is shared we need to obtain our own copy.
2634 if (skb_shared(skb)) {
2635 struct sk_buff *tmp_skb = skb;
2637 /* can't happen -- skb is a clone if info_id != 0 */
2640 skb = skb_clone(skb, GFP_ATOMIC);
2649 hdr.frame_control = fc;
2650 hdr.duration_id = 0;
2653 skip_header_bytes = ETH_HLEN;
2654 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2655 encaps_data = bridge_tunnel_header;
2656 encaps_len = sizeof(bridge_tunnel_header);
2657 skip_header_bytes -= 2;
2658 } else if (ethertype >= ETH_P_802_3_MIN) {
2659 encaps_data = rfc1042_header;
2660 encaps_len = sizeof(rfc1042_header);
2661 skip_header_bytes -= 2;
2667 skb_pull(skb, skip_header_bytes);
2668 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2671 * So we need to modify the skb header and hence need a copy of
2672 * that. The head_need variable above doesn't, so far, include
2673 * the needed header space that we don't need right away. If we
2674 * can, then we don't reallocate right now but only after the
2675 * frame arrives at the master device (if it does...)
2677 * If we cannot, however, then we will reallocate to include all
2678 * the ever needed space. Also, if we need to reallocate it anyway,
2679 * make it big enough for everything we may ever need.
2682 if (head_need > 0 || skb_cloned(skb)) {
2683 head_need += sdata->encrypt_headroom;
2684 head_need += local->tx_headroom;
2685 head_need = max_t(int, 0, head_need);
2686 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2687 ieee80211_free_txskb(&local->hw, skb);
2689 return ERR_PTR(-ENOMEM);
2694 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2696 #ifdef CONFIG_MAC80211_MESH
2698 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2701 if (ieee80211_is_data_qos(fc)) {
2702 __le16 *qos_control;
2704 qos_control = (__le16 *) skb_push(skb, 2);
2705 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2707 * Maybe we could actually set some fields here, for now just
2708 * initialise to zero to indicate no special operation.
2712 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2714 skb_reset_mac_header(skb);
2716 info = IEEE80211_SKB_CB(skb);
2717 memset(info, 0, sizeof(*info));
2719 info->flags = info_flags;
2720 info->ack_frame_id = info_id;
2726 return ERR_PTR(ret);
2730 * fast-xmit overview
2732 * The core idea of this fast-xmit is to remove per-packet checks by checking
2733 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2734 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2735 * much less work can be done per packet. For example, fragmentation must be
2736 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2739 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2740 * header and other data to aid packet processing in ieee80211_xmit_fast().
2742 * The most difficult part of this is that when any of these assumptions
2743 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2744 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2745 * since the per-packet code no longer checks the conditions. This is reflected
2746 * by the calls to these functions throughout the rest of the code, and must be
2747 * maintained if any of the TX path checks change.
2750 void ieee80211_check_fast_xmit(struct sta_info *sta)
2752 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2753 struct ieee80211_local *local = sta->local;
2754 struct ieee80211_sub_if_data *sdata = sta->sdata;
2755 struct ieee80211_hdr *hdr = (void *)build.hdr;
2756 struct ieee80211_chanctx_conf *chanctx_conf;
2759 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2762 /* Locking here protects both the pointer itself, and against concurrent
2763 * invocations winning data access races to, e.g., the key pointer that
2765 * Without it, the invocation of this function right after the key
2766 * pointer changes wouldn't be sufficient, as another CPU could access
2767 * the pointer, then stall, and then do the cache update after the CPU
2768 * that invalidated the key.
2769 * With the locking, such scenarios cannot happen as the check for the
2770 * key and the fast-tx assignment are done atomically, so the CPU that
2771 * modifies the key will either wait or other one will see the key
2772 * cleared/changed already.
2774 spin_lock_bh(&sta->lock);
2775 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2776 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2777 sdata->vif.type == NL80211_IFTYPE_STATION)
2780 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2783 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2784 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2785 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2786 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2789 if (sdata->noack_map)
2792 /* fast-xmit doesn't handle fragmentation at all */
2793 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2794 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2798 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2799 if (!chanctx_conf) {
2803 build.band = chanctx_conf->def.chan->band;
2806 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2808 switch (sdata->vif.type) {
2809 case NL80211_IFTYPE_ADHOC:
2811 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2812 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2813 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2816 case NL80211_IFTYPE_STATION:
2817 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2819 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2820 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2821 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2826 if (sdata->u.mgd.use_4addr) {
2827 /* non-regular ethertype cannot use the fastpath */
2828 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2829 IEEE80211_FCTL_TODS);
2831 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2832 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2833 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2834 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2838 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2840 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2841 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2842 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2845 case NL80211_IFTYPE_AP_VLAN:
2846 if (sdata->wdev.use_4addr) {
2847 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2848 IEEE80211_FCTL_TODS);
2850 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2851 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2852 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2853 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2858 case NL80211_IFTYPE_AP:
2859 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2861 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2862 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2863 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2867 /* not handled on fast-xmit */
2873 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2876 /* We store the key here so there's no point in using rcu_dereference()
2877 * but that's fine because the code that changes the pointers will call
2878 * this function after doing so. For a single CPU that would be enough,
2879 * for multiple see the comment above.
2881 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2883 build.key = rcu_access_pointer(sdata->default_unicast_key);
2885 bool gen_iv, iv_spc, mmic;
2887 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2888 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2889 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2891 /* don't handle software crypto */
2892 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2895 switch (build.key->conf.cipher) {
2896 case WLAN_CIPHER_SUITE_CCMP:
2897 case WLAN_CIPHER_SUITE_CCMP_256:
2898 /* add fixed key ID */
2900 (build.hdr + build.hdr_len)[3] =
2901 0x20 | (build.key->conf.keyidx << 6);
2902 build.pn_offs = build.hdr_len;
2904 if (gen_iv || iv_spc)
2905 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2907 case WLAN_CIPHER_SUITE_GCMP:
2908 case WLAN_CIPHER_SUITE_GCMP_256:
2909 /* add fixed key ID */
2911 (build.hdr + build.hdr_len)[3] =
2912 0x20 | (build.key->conf.keyidx << 6);
2913 build.pn_offs = build.hdr_len;
2915 if (gen_iv || iv_spc)
2916 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2918 case WLAN_CIPHER_SUITE_TKIP:
2919 /* cannot handle MMIC or IV generation in xmit-fast */
2923 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2925 case WLAN_CIPHER_SUITE_WEP40:
2926 case WLAN_CIPHER_SUITE_WEP104:
2927 /* cannot handle IV generation in fast-xmit */
2931 build.hdr_len += IEEE80211_WEP_IV_LEN;
2933 case WLAN_CIPHER_SUITE_AES_CMAC:
2934 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2935 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2936 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2938 "management cipher suite 0x%x enabled for data\n",
2939 build.key->conf.cipher);
2942 /* we don't know how to generate IVs for this at all */
2943 if (WARN_ON(gen_iv))
2945 /* pure hardware keys are OK, of course */
2946 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2948 /* cipher scheme might require space allocation */
2950 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2953 build.hdr_len += build.key->conf.iv_len;
2956 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2959 hdr->frame_control = fc;
2961 memcpy(build.hdr + build.hdr_len,
2962 rfc1042_header, sizeof(rfc1042_header));
2963 build.hdr_len += sizeof(rfc1042_header);
2965 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2966 /* if the kmemdup fails, continue w/o fast_tx */
2971 /* we might have raced against another call to this function */
2972 old = rcu_dereference_protected(sta->fast_tx,
2973 lockdep_is_held(&sta->lock));
2974 rcu_assign_pointer(sta->fast_tx, fast_tx);
2976 kfree_rcu(old, rcu_head);
2977 spin_unlock_bh(&sta->lock);
2980 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2982 struct sta_info *sta;
2985 list_for_each_entry_rcu(sta, &local->sta_list, list)
2986 ieee80211_check_fast_xmit(sta);
2990 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2992 struct ieee80211_local *local = sdata->local;
2993 struct sta_info *sta;
2997 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2998 if (sdata != sta->sdata &&
2999 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3001 ieee80211_check_fast_xmit(sta);
3007 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3009 struct ieee80211_fast_tx *fast_tx;
3011 spin_lock_bh(&sta->lock);
3012 fast_tx = rcu_dereference_protected(sta->fast_tx,
3013 lockdep_is_held(&sta->lock));
3014 RCU_INIT_POINTER(sta->fast_tx, NULL);
3015 spin_unlock_bh(&sta->lock);
3018 kfree_rcu(fast_tx, rcu_head);
3021 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3022 struct sk_buff *skb, int headroom,
3025 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3026 int padding = (4 - amsdu_len) & 3;
3028 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3029 I802_DEBUG_INC(local->tx_expand_skb_head);
3031 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3032 wiphy_debug(local->hw.wiphy,
3033 "failed to reallocate TX buffer\n");
3039 *subframe_len += padding;
3040 memset(skb_put(skb, padding), 0, padding);
3046 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3047 struct ieee80211_fast_tx *fast_tx,
3048 struct sk_buff *skb)
3050 struct ieee80211_local *local = sdata->local;
3051 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3052 struct ieee80211_hdr *hdr;
3053 struct ethhdr *amsdu_hdr;
3054 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3055 int subframe_len = skb->len - hdr_len;
3057 u8 *qc, *h_80211_src, *h_80211_dst;
3060 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3063 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3066 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr),
3070 data = skb_push(skb, sizeof(*amsdu_hdr));
3071 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3073 amsdu_hdr = data + hdr_len;
3074 /* h_80211_src/dst is addr* field within hdr */
3075 h_80211_src = data + fast_tx->sa_offs;
3076 h_80211_dst = data + fast_tx->da_offs;
3078 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3079 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3080 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3082 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3083 * fields needs to be changed to BSSID for A-MSDU frames depending
3084 * on FromDS/ToDS values.
3086 switch (sdata->vif.type) {
3087 case NL80211_IFTYPE_STATION:
3088 bssid = sdata->u.mgd.bssid;
3090 case NL80211_IFTYPE_AP:
3091 case NL80211_IFTYPE_AP_VLAN:
3092 bssid = sdata->vif.addr;
3098 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3099 ether_addr_copy(h_80211_src, bssid);
3101 if (bssid && ieee80211_has_tods(hdr->frame_control))
3102 ether_addr_copy(h_80211_dst, bssid);
3104 qc = ieee80211_get_qos_ctl(hdr);
3105 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3107 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3112 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3113 struct sta_info *sta,
3114 struct ieee80211_fast_tx *fast_tx,
3115 struct sk_buff *skb)
3117 struct ieee80211_local *local = sdata->local;
3118 struct fq *fq = &local->fq;
3120 struct fq_flow *flow;
3121 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3122 struct ieee80211_txq *txq = sta->sta.txq[tid];
3123 struct txq_info *txqi;
3124 struct sk_buff **frag_tail, *head;
3125 int subframe_len = skb->len - ETH_ALEN;
3126 u8 max_subframes = sta->sta.max_amsdu_subframes;
3127 int max_frags = local->hw.max_tx_fragments;
3128 int max_amsdu_len = sta->sta.max_amsdu_len;
3132 unsigned int orig_len;
3135 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3141 txqi = to_txq_info(txq);
3142 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3145 if (sta->sta.max_rc_amsdu_len)
3146 max_amsdu_len = min_t(int, max_amsdu_len,
3147 sta->sta.max_rc_amsdu_len);
3149 spin_lock_bh(&fq->lock);
3151 /* TODO: Ideally aggregation should be done on dequeue to remain
3152 * responsive to environment changes.
3156 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3157 head = skb_peek_tail(&flow->queue);
3161 orig_len = head->len;
3163 if (skb->len + head->len > max_amsdu_len)
3166 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3169 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3170 nfrags += 1 + skb_shinfo(head)->nr_frags;
3171 frag_tail = &skb_shinfo(head)->frag_list;
3172 while (*frag_tail) {
3173 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3174 frag_tail = &(*frag_tail)->next;
3178 if (max_subframes && n > max_subframes)
3181 if (max_frags && nfrags > max_frags)
3184 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3189 data = skb_push(skb, ETH_ALEN + 2);
3190 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3192 data += 2 * ETH_ALEN;
3193 len = cpu_to_be16(subframe_len);
3194 memcpy(data, &len, 2);
3195 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3197 head->len += skb->len;
3198 head->data_len += skb->len;
3201 flow->backlog += head->len - orig_len;
3202 tin->backlog_bytes += head->len - orig_len;
3204 fq_recalc_backlog(fq, tin, flow);
3207 spin_unlock_bh(&fq->lock);
3213 * Can be called while the sta lock is held. Anything that can cause packets to
3214 * be generated will cause deadlock!
3216 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3217 struct sta_info *sta, u8 pn_offs,
3218 struct ieee80211_key *key,
3219 struct sk_buff *skb)
3221 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3222 struct ieee80211_hdr *hdr = (void *)skb->data;
3223 u8 tid = IEEE80211_NUM_TIDS;
3226 info->control.hw_key = &key->conf;
3228 ieee80211_tx_stats(skb->dev, skb->len);
3230 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3231 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3232 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3234 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3235 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3236 sdata->sequence_number += 0x10;
3239 if (skb_shinfo(skb)->gso_size)
3240 sta->tx_stats.msdu[tid] +=
3241 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3243 sta->tx_stats.msdu[tid]++;
3245 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3247 /* statistics normally done by ieee80211_tx_h_stats (but that
3248 * has to consider fragmentation, so is more complex)
3250 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3251 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3255 u8 *crypto_hdr = skb->data + pn_offs;
3257 switch (key->conf.cipher) {
3258 case WLAN_CIPHER_SUITE_CCMP:
3259 case WLAN_CIPHER_SUITE_CCMP_256:
3260 case WLAN_CIPHER_SUITE_GCMP:
3261 case WLAN_CIPHER_SUITE_GCMP_256:
3262 pn = atomic64_inc_return(&key->conf.tx_pn);
3264 crypto_hdr[1] = pn >> 8;
3265 crypto_hdr[4] = pn >> 16;
3266 crypto_hdr[5] = pn >> 24;
3267 crypto_hdr[6] = pn >> 32;
3268 crypto_hdr[7] = pn >> 40;
3274 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3275 struct sta_info *sta,
3276 struct ieee80211_fast_tx *fast_tx,
3277 struct sk_buff *skb)
3279 struct ieee80211_local *local = sdata->local;
3280 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3281 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3282 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3284 struct ieee80211_tx_info *info;
3285 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3286 struct ieee80211_tx_data tx;
3287 ieee80211_tx_result r;
3288 struct tid_ampdu_tx *tid_tx = NULL;
3289 u8 tid = IEEE80211_NUM_TIDS;
3291 /* control port protocol needs a lot of special handling */
3292 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3295 /* only RFC 1042 SNAP */
3296 if (ethertype < ETH_P_802_3_MIN)
3299 /* don't handle TX status request here either */
3300 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3303 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3304 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3305 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3307 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3309 if (tid_tx->timeout)
3310 tid_tx->last_tx = jiffies;
3314 /* after this point (skb is modified) we cannot return false */
3316 if (skb_shared(skb)) {
3317 struct sk_buff *tmp_skb = skb;
3319 skb = skb_clone(skb, GFP_ATOMIC);
3326 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3327 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3330 /* will not be crypto-handled beyond what we do here, so use false
3331 * as the may-encrypt argument for the resize to not account for
3332 * more room than we already have in 'extra_head'
3334 if (unlikely(ieee80211_skb_resize(sdata, skb,
3335 max_t(int, extra_head + hw_headroom -
3336 skb_headroom(skb), 0),
3342 memcpy(ð, skb->data, ETH_HLEN - 2);
3343 hdr = (void *)skb_push(skb, extra_head);
3344 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3345 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3346 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3348 info = IEEE80211_SKB_CB(skb);
3349 memset(info, 0, sizeof(*info));
3350 info->band = fast_tx->band;
3351 info->control.vif = &sdata->vif;
3352 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3353 IEEE80211_TX_CTL_DONTFRAG |
3354 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3355 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3357 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3358 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3359 *ieee80211_get_qos_ctl(hdr) = tid;
3362 __skb_queue_head_init(&tx.skbs);
3364 tx.flags = IEEE80211_TX_UNICAST;
3368 tx.key = fast_tx->key;
3370 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3372 r = ieee80211_tx_h_rate_ctrl(&tx);
3376 if (r != TX_CONTINUE) {
3383 if (ieee80211_queue_skb(local, sdata, sta, skb))
3386 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3389 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3390 sdata = container_of(sdata->bss,
3391 struct ieee80211_sub_if_data, u.ap);
3393 __skb_queue_tail(&tx.skbs, skb);
3394 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3398 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3399 struct ieee80211_txq *txq)
3401 struct ieee80211_local *local = hw_to_local(hw);
3402 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3403 struct ieee80211_hdr *hdr;
3404 struct sk_buff *skb = NULL;
3405 struct fq *fq = &local->fq;
3406 struct fq_tin *tin = &txqi->tin;
3407 struct ieee80211_tx_info *info;
3408 struct ieee80211_tx_data tx;
3409 ieee80211_tx_result r;
3411 spin_lock_bh(&fq->lock);
3413 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3416 /* Make sure fragments stay together. */
3417 skb = __skb_dequeue(&txqi->frags);
3422 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3426 ieee80211_set_skb_vif(skb, txqi);
3428 hdr = (struct ieee80211_hdr *)skb->data;
3429 info = IEEE80211_SKB_CB(skb);
3431 memset(&tx, 0, sizeof(tx));
3432 __skb_queue_head_init(&tx.skbs);
3435 tx.sdata = vif_to_sdata(info->control.vif);
3438 tx.sta = container_of(txq->sta, struct sta_info, sta);
3441 * The key can be removed while the packet was queued, so need to call
3442 * this here to get the current key.
3444 r = ieee80211_tx_h_select_key(&tx);
3445 if (r != TX_CONTINUE) {
3446 ieee80211_free_txskb(&local->hw, skb);
3450 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3451 info->flags |= IEEE80211_TX_CTL_AMPDU;
3453 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3455 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3456 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3461 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3462 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3464 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3467 if (invoke_tx_handlers_late(&tx))
3470 skb = __skb_dequeue(&tx.skbs);
3472 if (!skb_queue_empty(&tx.skbs))
3473 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3476 if (skb && skb_has_frag_list(skb) &&
3477 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3478 if (skb_linearize(skb)) {
3479 ieee80211_free_txskb(&local->hw, skb);
3485 spin_unlock_bh(&fq->lock);
3489 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3491 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3492 struct net_device *dev,
3495 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3496 struct sta_info *sta;
3497 struct sk_buff *next;
3499 if (unlikely(skb->len < ETH_HLEN)) {
3506 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3509 if (!IS_ERR_OR_NULL(sta)) {
3510 struct ieee80211_fast_tx *fast_tx;
3512 fast_tx = rcu_dereference(sta->fast_tx);
3515 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3519 if (skb_is_gso(skb)) {
3520 struct sk_buff *segs;
3522 segs = skb_gso_segment(skb, 0);
3530 /* we cannot process non-linear frames on this path */
3531 if (skb_linearize(skb)) {
3536 /* the frame could be fragmented, software-encrypted, and other
3537 * things so we cannot really handle checksum offload with it -
3538 * fix it up in software before we handle anything else.
3540 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3541 skb_set_transport_header(skb,
3542 skb_checksum_start_offset(skb));
3543 if (skb_checksum_help(skb))
3556 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3560 ieee80211_tx_stats(dev, skb->len);
3562 ieee80211_xmit(sdata, sta, skb);
3571 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3576 err = skb_ensure_writable(skb, ETH_HLEN);
3580 eth = (void *)skb->data;
3581 ether_addr_copy(eth->h_dest, sta->sta.addr);
3586 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3587 struct net_device *dev)
3589 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3590 const struct ethhdr *eth = (void *)skb->data;
3591 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3594 if (likely(!is_multicast_ether_addr(eth->h_dest)))
3597 switch (sdata->vif.type) {
3598 case NL80211_IFTYPE_AP_VLAN:
3599 if (sdata->u.vlan.sta)
3601 if (sdata->wdev.use_4addr)
3604 case NL80211_IFTYPE_AP:
3605 /* check runtime toggle for this bss */
3606 if (!sdata->bss->multicast_to_unicast)
3613 /* multicast to unicast conversion only for some payload */
3614 ethertype = eth->h_proto;
3615 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3616 ethertype = ethvlan->h_vlan_encapsulated_proto;
3617 switch (ethertype) {
3618 case htons(ETH_P_ARP):
3619 case htons(ETH_P_IP):
3620 case htons(ETH_P_IPV6):
3630 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3631 struct sk_buff_head *queue)
3633 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3634 struct ieee80211_local *local = sdata->local;
3635 const struct ethhdr *eth = (struct ethhdr *)skb->data;
3636 struct sta_info *sta, *first = NULL;
3637 struct sk_buff *cloned_skb;
3641 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3642 if (sdata != sta->sdata)
3643 /* AP-VLAN mismatch */
3645 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3646 /* do not send back to source */
3652 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3655 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3656 dev_kfree_skb(cloned_skb);
3659 __skb_queue_tail(queue, cloned_skb);
3662 if (likely(first)) {
3663 if (unlikely(ieee80211_change_da(skb, first)))
3665 __skb_queue_tail(queue, skb);
3667 /* no STA connected, drop */
3674 __skb_queue_purge(queue);
3675 __skb_queue_tail(queue, skb);
3681 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3682 * @skb: packet to be sent
3683 * @dev: incoming interface
3685 * On failure skb will be freed.
3687 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3688 struct net_device *dev)
3690 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3691 struct sk_buff_head queue;
3693 __skb_queue_head_init(&queue);
3694 ieee80211_convert_to_unicast(skb, dev, &queue);
3695 while ((skb = __skb_dequeue(&queue)))
3696 __ieee80211_subif_start_xmit(skb, dev, 0);
3698 __ieee80211_subif_start_xmit(skb, dev, 0);
3701 return NETDEV_TX_OK;
3705 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3706 struct sk_buff *skb, u32 info_flags)
3708 struct ieee80211_hdr *hdr;
3709 struct ieee80211_tx_data tx = {
3710 .local = sdata->local,
3713 struct sta_info *sta;
3717 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3719 skb = ERR_PTR(-EINVAL);
3723 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3727 hdr = (void *)skb->data;
3728 tx.sta = sta_info_get(sdata, hdr->addr1);
3731 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3734 return ERR_PTR(-EINVAL);
3743 * ieee80211_clear_tx_pending may not be called in a context where
3744 * it is possible that it packets could come in again.
3746 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3748 struct sk_buff *skb;
3751 for (i = 0; i < local->hw.queues; i++) {
3752 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3753 ieee80211_free_txskb(&local->hw, skb);
3758 * Returns false if the frame couldn't be transmitted but was queued instead,
3759 * which in this case means re-queued -- take as an indication to stop sending
3760 * more pending frames.
3762 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3763 struct sk_buff *skb)
3765 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3766 struct ieee80211_sub_if_data *sdata;
3767 struct sta_info *sta;
3768 struct ieee80211_hdr *hdr;
3770 struct ieee80211_chanctx_conf *chanctx_conf;
3772 sdata = vif_to_sdata(info->control.vif);
3774 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3775 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3776 if (unlikely(!chanctx_conf)) {
3780 info->band = chanctx_conf->def.chan->band;
3781 result = ieee80211_tx(sdata, NULL, skb, true);
3783 struct sk_buff_head skbs;
3785 __skb_queue_head_init(&skbs);
3786 __skb_queue_tail(&skbs, skb);
3788 hdr = (struct ieee80211_hdr *)skb->data;
3789 sta = sta_info_get(sdata, hdr->addr1);
3791 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3798 * Transmit all pending packets. Called from tasklet.
3800 void ieee80211_tx_pending(unsigned long data)
3802 struct ieee80211_local *local = (struct ieee80211_local *)data;
3803 unsigned long flags;
3809 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3810 for (i = 0; i < local->hw.queues; i++) {
3812 * If queue is stopped by something other than due to pending
3813 * frames, or we have no pending frames, proceed to next queue.
3815 if (local->queue_stop_reasons[i] ||
3816 skb_queue_empty(&local->pending[i]))
3819 while (!skb_queue_empty(&local->pending[i])) {
3820 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3821 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3823 if (WARN_ON(!info->control.vif)) {
3824 ieee80211_free_txskb(&local->hw, skb);
3828 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3831 txok = ieee80211_tx_pending_skb(local, skb);
3832 spin_lock_irqsave(&local->queue_stop_reason_lock,
3838 if (skb_queue_empty(&local->pending[i]))
3839 ieee80211_propagate_queue_wake(local, i);
3841 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3846 /* functions for drivers to get certain frames */
3848 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3849 struct ps_data *ps, struct sk_buff *skb,
3854 int i, have_bits = 0, n1, n2;
3856 /* Generate bitmap for TIM only if there are any STAs in power save
3858 if (atomic_read(&ps->num_sta_ps) > 0)
3859 /* in the hope that this is faster than
3860 * checking byte-for-byte */
3861 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3862 IEEE80211_MAX_AID+1);
3864 if (ps->dtim_count == 0)
3865 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3870 tim = pos = (u8 *) skb_put(skb, 6);
3871 *pos++ = WLAN_EID_TIM;
3873 *pos++ = ps->dtim_count;
3874 *pos++ = sdata->vif.bss_conf.dtim_period;
3876 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3879 ps->dtim_bc_mc = aid0 == 1;
3882 /* Find largest even number N1 so that bits numbered 1 through
3883 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3884 * (N2 + 1) x 8 through 2007 are 0. */
3886 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3893 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3900 /* Bitmap control */
3902 /* Part Virt Bitmap */
3903 skb_put(skb, n2 - n1);
3904 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3906 tim[1] = n2 - n1 + 4;
3908 *pos++ = aid0; /* Bitmap control */
3909 *pos++ = 0; /* Part Virt Bitmap */
3913 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3914 struct ps_data *ps, struct sk_buff *skb,
3917 struct ieee80211_local *local = sdata->local;
3920 * Not very nice, but we want to allow the driver to call
3921 * ieee80211_beacon_get() as a response to the set_tim()
3922 * callback. That, however, is already invoked under the
3923 * sta_lock to guarantee consistent and race-free update
3924 * of the tim bitmap in mac80211 and the driver.
3926 if (local->tim_in_locked_section) {
3927 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3929 spin_lock_bh(&local->tim_lock);
3930 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3931 spin_unlock_bh(&local->tim_lock);
3937 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3938 struct beacon_data *beacon)
3940 struct probe_resp *resp;
3942 size_t beacon_data_len;
3944 u8 count = beacon->csa_current_counter;
3946 switch (sdata->vif.type) {
3947 case NL80211_IFTYPE_AP:
3948 beacon_data = beacon->tail;
3949 beacon_data_len = beacon->tail_len;
3951 case NL80211_IFTYPE_ADHOC:
3952 beacon_data = beacon->head;
3953 beacon_data_len = beacon->head_len;
3955 case NL80211_IFTYPE_MESH_POINT:
3956 beacon_data = beacon->head;
3957 beacon_data_len = beacon->head_len;
3964 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3965 resp = rcu_dereference(sdata->u.ap.probe_resp);
3967 if (beacon->csa_counter_offsets[i]) {
3968 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3974 beacon_data[beacon->csa_counter_offsets[i]] = count;
3977 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3978 resp->data[resp->csa_counter_offsets[i]] = count;
3983 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3985 beacon->csa_current_counter--;
3987 /* the counter should never reach 0 */
3988 WARN_ON_ONCE(!beacon->csa_current_counter);
3990 return beacon->csa_current_counter;
3993 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3995 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3996 struct beacon_data *beacon = NULL;
4001 if (sdata->vif.type == NL80211_IFTYPE_AP)
4002 beacon = rcu_dereference(sdata->u.ap.beacon);
4003 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4004 beacon = rcu_dereference(sdata->u.ibss.presp);
4005 else if (ieee80211_vif_is_mesh(&sdata->vif))
4006 beacon = rcu_dereference(sdata->u.mesh.beacon);
4011 count = __ieee80211_csa_update_counter(beacon);
4017 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4019 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4021 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4022 struct beacon_data *beacon = NULL;
4024 size_t beacon_data_len;
4027 if (!ieee80211_sdata_running(sdata))
4031 if (vif->type == NL80211_IFTYPE_AP) {
4032 struct ieee80211_if_ap *ap = &sdata->u.ap;
4034 beacon = rcu_dereference(ap->beacon);
4035 if (WARN_ON(!beacon || !beacon->tail))
4037 beacon_data = beacon->tail;
4038 beacon_data_len = beacon->tail_len;
4039 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4040 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4042 beacon = rcu_dereference(ifibss->presp);
4046 beacon_data = beacon->head;
4047 beacon_data_len = beacon->head_len;
4048 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4049 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4051 beacon = rcu_dereference(ifmsh->beacon);
4055 beacon_data = beacon->head;
4056 beacon_data_len = beacon->head_len;
4062 if (!beacon->csa_counter_offsets[0])
4065 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4068 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4075 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4077 static struct sk_buff *
4078 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4079 struct ieee80211_vif *vif,
4080 struct ieee80211_mutable_offsets *offs,
4083 struct ieee80211_local *local = hw_to_local(hw);
4084 struct beacon_data *beacon = NULL;
4085 struct sk_buff *skb = NULL;
4086 struct ieee80211_tx_info *info;
4087 struct ieee80211_sub_if_data *sdata = NULL;
4088 enum nl80211_band band;
4089 struct ieee80211_tx_rate_control txrc;
4090 struct ieee80211_chanctx_conf *chanctx_conf;
4091 int csa_off_base = 0;
4095 sdata = vif_to_sdata(vif);
4096 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4098 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4102 memset(offs, 0, sizeof(*offs));
4104 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4105 struct ieee80211_if_ap *ap = &sdata->u.ap;
4107 beacon = rcu_dereference(ap->beacon);
4109 if (beacon->csa_counter_offsets[0]) {
4111 __ieee80211_csa_update_counter(beacon);
4113 ieee80211_set_csa(sdata, beacon);
4117 * headroom, head length,
4118 * tail length and maximum TIM length
4120 skb = dev_alloc_skb(local->tx_headroom +
4122 beacon->tail_len + 256 +
4123 local->hw.extra_beacon_tailroom);
4127 skb_reserve(skb, local->tx_headroom);
4128 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4131 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4135 offs->tim_offset = beacon->head_len;
4136 offs->tim_length = skb->len - beacon->head_len;
4138 /* for AP the csa offsets are from tail */
4139 csa_off_base = skb->len;
4143 memcpy(skb_put(skb, beacon->tail_len),
4144 beacon->tail, beacon->tail_len);
4147 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4148 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4149 struct ieee80211_hdr *hdr;
4151 beacon = rcu_dereference(ifibss->presp);
4155 if (beacon->csa_counter_offsets[0]) {
4157 __ieee80211_csa_update_counter(beacon);
4159 ieee80211_set_csa(sdata, beacon);
4162 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4163 local->hw.extra_beacon_tailroom);
4166 skb_reserve(skb, local->tx_headroom);
4167 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4170 hdr = (struct ieee80211_hdr *) skb->data;
4171 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4172 IEEE80211_STYPE_BEACON);
4173 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4174 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4176 beacon = rcu_dereference(ifmsh->beacon);
4180 if (beacon->csa_counter_offsets[0]) {
4182 /* TODO: For mesh csa_counter is in TU, so
4183 * decrementing it by one isn't correct, but
4184 * for now we leave it consistent with overall
4185 * mac80211's behavior.
4187 __ieee80211_csa_update_counter(beacon);
4189 ieee80211_set_csa(sdata, beacon);
4192 if (ifmsh->sync_ops)
4193 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4195 skb = dev_alloc_skb(local->tx_headroom +
4199 local->hw.extra_beacon_tailroom);
4202 skb_reserve(skb, local->tx_headroom);
4203 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4205 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4208 offs->tim_offset = beacon->head_len;
4209 offs->tim_length = skb->len - beacon->head_len;
4212 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
4220 if (offs && beacon) {
4223 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4224 u16 csa_off = beacon->csa_counter_offsets[i];
4229 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4233 band = chanctx_conf->def.chan->band;
4235 info = IEEE80211_SKB_CB(skb);
4237 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4238 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4241 memset(&txrc, 0, sizeof(txrc));
4243 txrc.sband = local->hw.wiphy->bands[band];
4244 txrc.bss_conf = &sdata->vif.bss_conf;
4246 txrc.reported_rate.idx = -1;
4247 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4249 rate_control_get_rate(sdata, NULL, &txrc);
4251 info->control.vif = vif;
4253 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4254 IEEE80211_TX_CTL_ASSIGN_SEQ |
4255 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4263 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4264 struct ieee80211_vif *vif,
4265 struct ieee80211_mutable_offsets *offs)
4267 return __ieee80211_beacon_get(hw, vif, offs, true);
4269 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4271 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4272 struct ieee80211_vif *vif,
4273 u16 *tim_offset, u16 *tim_length)
4275 struct ieee80211_mutable_offsets offs = {};
4276 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4277 struct sk_buff *copy;
4278 struct ieee80211_supported_band *sband;
4285 *tim_offset = offs.tim_offset;
4288 *tim_length = offs.tim_length;
4290 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4291 !hw_to_local(hw)->monitors)
4294 /* send a copy to monitor interfaces */
4295 copy = skb_copy(bcn, GFP_ATOMIC);
4299 shift = ieee80211_vif_get_shift(vif);
4300 sband = ieee80211_get_sband(vif_to_sdata(vif));
4304 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4308 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4310 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4311 struct ieee80211_vif *vif)
4313 struct ieee80211_if_ap *ap = NULL;
4314 struct sk_buff *skb = NULL;
4315 struct probe_resp *presp = NULL;
4316 struct ieee80211_hdr *hdr;
4317 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4319 if (sdata->vif.type != NL80211_IFTYPE_AP)
4325 presp = rcu_dereference(ap->probe_resp);
4329 skb = dev_alloc_skb(presp->len);
4333 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
4335 hdr = (struct ieee80211_hdr *) skb->data;
4336 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4342 EXPORT_SYMBOL(ieee80211_proberesp_get);
4344 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4345 struct ieee80211_vif *vif)
4347 struct ieee80211_sub_if_data *sdata;
4348 struct ieee80211_if_managed *ifmgd;
4349 struct ieee80211_pspoll *pspoll;
4350 struct ieee80211_local *local;
4351 struct sk_buff *skb;
4353 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4356 sdata = vif_to_sdata(vif);
4357 ifmgd = &sdata->u.mgd;
4358 local = sdata->local;
4360 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4364 skb_reserve(skb, local->hw.extra_tx_headroom);
4366 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
4367 memset(pspoll, 0, sizeof(*pspoll));
4368 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4369 IEEE80211_STYPE_PSPOLL);
4370 pspoll->aid = cpu_to_le16(ifmgd->aid);
4372 /* aid in PS-Poll has its two MSBs each set to 1 */
4373 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4375 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4376 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4380 EXPORT_SYMBOL(ieee80211_pspoll_get);
4382 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4383 struct ieee80211_vif *vif)
4385 struct ieee80211_hdr_3addr *nullfunc;
4386 struct ieee80211_sub_if_data *sdata;
4387 struct ieee80211_if_managed *ifmgd;
4388 struct ieee80211_local *local;
4389 struct sk_buff *skb;
4391 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4394 sdata = vif_to_sdata(vif);
4395 ifmgd = &sdata->u.mgd;
4396 local = sdata->local;
4398 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
4402 skb_reserve(skb, local->hw.extra_tx_headroom);
4404 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
4406 memset(nullfunc, 0, 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);
4416 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4418 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4420 const u8 *ssid, size_t ssid_len,
4423 struct ieee80211_local *local = hw_to_local(hw);
4424 struct ieee80211_hdr_3addr *hdr;
4425 struct sk_buff *skb;
4429 ie_ssid_len = 2 + ssid_len;
4431 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4432 ie_ssid_len + tailroom);
4436 skb_reserve(skb, local->hw.extra_tx_headroom);
4438 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
4439 memset(hdr, 0, sizeof(*hdr));
4440 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4441 IEEE80211_STYPE_PROBE_REQ);
4442 eth_broadcast_addr(hdr->addr1);
4443 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4444 eth_broadcast_addr(hdr->addr3);
4446 pos = skb_put(skb, ie_ssid_len);
4447 *pos++ = WLAN_EID_SSID;
4450 memcpy(pos, ssid, ssid_len);
4455 EXPORT_SYMBOL(ieee80211_probereq_get);
4457 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4458 const void *frame, size_t frame_len,
4459 const struct ieee80211_tx_info *frame_txctl,
4460 struct ieee80211_rts *rts)
4462 const struct ieee80211_hdr *hdr = frame;
4464 rts->frame_control =
4465 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4466 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4468 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4469 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4471 EXPORT_SYMBOL(ieee80211_rts_get);
4473 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4474 const void *frame, size_t frame_len,
4475 const struct ieee80211_tx_info *frame_txctl,
4476 struct ieee80211_cts *cts)
4478 const struct ieee80211_hdr *hdr = frame;
4480 cts->frame_control =
4481 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4482 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4483 frame_len, frame_txctl);
4484 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4486 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4489 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4490 struct ieee80211_vif *vif)
4492 struct ieee80211_local *local = hw_to_local(hw);
4493 struct sk_buff *skb = NULL;
4494 struct ieee80211_tx_data tx;
4495 struct ieee80211_sub_if_data *sdata;
4497 struct ieee80211_tx_info *info;
4498 struct ieee80211_chanctx_conf *chanctx_conf;
4500 sdata = vif_to_sdata(vif);
4503 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4508 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4509 struct beacon_data *beacon =
4510 rcu_dereference(sdata->u.ap.beacon);
4512 if (!beacon || !beacon->head)
4515 ps = &sdata->u.ap.ps;
4516 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4517 ps = &sdata->u.mesh.ps;
4522 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4523 goto out; /* send buffered bc/mc only after DTIM beacon */
4526 skb = skb_dequeue(&ps->bc_buf);
4529 local->total_ps_buffered--;
4531 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4532 struct ieee80211_hdr *hdr =
4533 (struct ieee80211_hdr *) skb->data;
4534 /* more buffered multicast/broadcast frames ==> set
4535 * MoreData flag in IEEE 802.11 header to inform PS
4537 hdr->frame_control |=
4538 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4541 if (sdata->vif.type == NL80211_IFTYPE_AP)
4542 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4543 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4545 ieee80211_free_txskb(hw, skb);
4548 info = IEEE80211_SKB_CB(skb);
4550 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4551 info->band = chanctx_conf->def.chan->band;
4553 if (invoke_tx_handlers(&tx))
4560 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4562 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4564 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4565 struct ieee80211_sub_if_data *sdata = sta->sdata;
4566 struct ieee80211_local *local = sdata->local;
4570 lockdep_assert_held(&local->sta_mtx);
4572 /* only some cases are supported right now */
4573 switch (sdata->vif.type) {
4574 case NL80211_IFTYPE_STATION:
4575 case NL80211_IFTYPE_AP:
4576 case NL80211_IFTYPE_AP_VLAN:
4583 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4586 if (sta->reserved_tid == tid) {
4591 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4592 sdata_err(sdata, "TID reservation already active\n");
4597 ieee80211_stop_vif_queues(sdata->local, sdata,
4598 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4602 /* Tear down BA sessions so we stop aggregating on this TID */
4603 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4604 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4605 __ieee80211_stop_tx_ba_session(sta, tid,
4606 AGG_STOP_LOCAL_REQUEST);
4609 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4610 __ieee80211_flush_queues(local, sdata, queues, false);
4612 sta->reserved_tid = tid;
4614 ieee80211_wake_vif_queues(local, sdata,
4615 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4617 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4618 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4624 EXPORT_SYMBOL(ieee80211_reserve_tid);
4626 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4628 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4629 struct ieee80211_sub_if_data *sdata = sta->sdata;
4631 lockdep_assert_held(&sdata->local->sta_mtx);
4633 /* only some cases are supported right now */
4634 switch (sdata->vif.type) {
4635 case NL80211_IFTYPE_STATION:
4636 case NL80211_IFTYPE_AP:
4637 case NL80211_IFTYPE_AP_VLAN:
4644 if (tid != sta->reserved_tid) {
4645 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4649 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4651 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4653 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4654 struct sk_buff *skb, int tid,
4655 enum nl80211_band band)
4657 int ac = ieee80211_ac_from_tid(tid);
4659 skb_reset_mac_header(skb);
4660 skb_set_queue_mapping(skb, ac);
4661 skb->priority = tid;
4663 skb->dev = sdata->dev;
4666 * The other path calling ieee80211_xmit is from the tasklet,
4667 * and while we can handle concurrent transmissions locking
4668 * requirements are that we do not come into tx with bhs on.
4671 IEEE80211_SKB_CB(skb)->band = band;
4672 ieee80211_xmit(sdata, NULL, skb);