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/etherdevice.h>
20 #include <linux/bitmap.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <net/net_namespace.h>
24 #include <net/ieee80211_radiotap.h>
25 #include <net/cfg80211.h>
26 #include <net/mac80211.h>
27 #include <asm/unaligned.h>
29 #include "ieee80211_i.h"
30 #include "driver-ops.h"
40 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
42 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
44 u64_stats_update_begin(&tstats->syncp);
46 tstats->tx_bytes += len;
47 u64_stats_update_end(&tstats->syncp);
50 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
51 struct sk_buff *skb, int group_addr,
54 int rate, mrate, erp, dur, i, shift = 0;
55 struct ieee80211_rate *txrate;
56 struct ieee80211_local *local = tx->local;
57 struct ieee80211_supported_band *sband;
58 struct ieee80211_hdr *hdr;
59 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
60 struct ieee80211_chanctx_conf *chanctx_conf;
64 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
66 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
67 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
71 /* assume HW handles this */
72 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
76 if (WARN_ON_ONCE(tx->rate.idx < 0))
79 sband = local->hw.wiphy->bands[info->band];
80 txrate = &sband->bitrates[tx->rate.idx];
82 erp = txrate->flags & IEEE80211_RATE_ERP_G;
85 * data and mgmt (except PS Poll):
87 * - during contention period:
88 * if addr1 is group address: 0
89 * if more fragments = 0 and addr1 is individual address: time to
90 * transmit one ACK plus SIFS
91 * if more fragments = 1 and addr1 is individual address: time to
92 * transmit next fragment plus 2 x ACK plus 3 x SIFS
95 * - control response frame (CTS or ACK) shall be transmitted using the
96 * same rate as the immediately previous frame in the frame exchange
97 * sequence, if this rate belongs to the PHY mandatory rates, or else
98 * at the highest possible rate belonging to the PHY rates in the
101 hdr = (struct ieee80211_hdr *)skb->data;
102 if (ieee80211_is_ctl(hdr->frame_control)) {
103 /* TODO: These control frames are not currently sent by
104 * mac80211, but should they be implemented, this function
105 * needs to be updated to support duration field calculation.
107 * RTS: time needed to transmit pending data/mgmt frame plus
108 * one CTS frame plus one ACK frame plus 3 x SIFS
109 * CTS: duration of immediately previous RTS minus time
110 * required to transmit CTS and its SIFS
111 * ACK: 0 if immediately previous directed data/mgmt had
112 * more=0, with more=1 duration in ACK frame is duration
113 * from previous frame minus time needed to transmit ACK
115 * PS Poll: BIT(15) | BIT(14) | aid
121 if (0 /* FIX: data/mgmt during CFP */)
122 return cpu_to_le16(32768);
124 if (group_addr) /* Group address as the destination - no ACK */
127 /* Individual destination address:
128 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
129 * CTS and ACK frames shall be transmitted using the highest rate in
130 * basic rate set that is less than or equal to the rate of the
131 * immediately previous frame and that is using the same modulation
132 * (CCK or OFDM). If no basic rate set matches with these requirements,
133 * the highest mandatory rate of the PHY that is less than or equal to
134 * the rate of the previous frame is used.
135 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
138 /* use lowest available if everything fails */
139 mrate = sband->bitrates[0].bitrate;
140 for (i = 0; i < sband->n_bitrates; i++) {
141 struct ieee80211_rate *r = &sband->bitrates[i];
143 if (r->bitrate > txrate->bitrate)
146 if ((rate_flags & r->flags) != rate_flags)
149 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
150 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
152 switch (sband->band) {
153 case IEEE80211_BAND_2GHZ: {
155 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
156 flag = IEEE80211_RATE_MANDATORY_G;
158 flag = IEEE80211_RATE_MANDATORY_B;
163 case IEEE80211_BAND_5GHZ:
164 if (r->flags & IEEE80211_RATE_MANDATORY_A)
167 case IEEE80211_BAND_60GHZ:
168 /* TODO, for now fall through */
169 case IEEE80211_NUM_BANDS:
175 /* No matching basic rate found; use highest suitable mandatory
177 rate = DIV_ROUND_UP(mrate, 1 << shift);
180 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
181 if (ieee80211_is_data_qos(hdr->frame_control) &&
182 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
185 /* Time needed to transmit ACK
186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
187 * to closest integer */
188 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
189 tx->sdata->vif.bss_conf.use_short_preamble,
193 /* Frame is fragmented: duration increases with time needed to
194 * transmit next fragment plus ACK and 2 x SIFS. */
195 dur *= 2; /* ACK + SIFS */
197 dur += ieee80211_frame_duration(sband->band, next_frag_len,
198 txrate->bitrate, erp,
199 tx->sdata->vif.bss_conf.use_short_preamble,
203 return cpu_to_le16(dur);
207 static ieee80211_tx_result debug_noinline
208 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
210 struct ieee80211_local *local = tx->local;
211 struct ieee80211_if_managed *ifmgd;
213 /* driver doesn't support power save */
214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
217 /* hardware does dynamic power save */
218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
221 /* dynamic power save disabled */
222 if (local->hw.conf.dynamic_ps_timeout <= 0)
225 /* we are scanning, don't enable power save */
229 if (!local->ps_sdata)
232 /* No point if we're going to suspend */
233 if (local->quiescing)
236 /* dynamic ps is supported only in managed mode */
237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
240 ifmgd = &tx->sdata->u.mgd;
243 * Don't wakeup from power save if u-apsd is enabled, voip ac has
244 * u-apsd enabled and the frame is in voip class. This effectively
245 * means that even if all access categories have u-apsd enabled, in
246 * practise u-apsd is only used with the voip ac. This is a
247 * workaround for the case when received voip class packets do not
248 * have correct qos tag for some reason, due the network or the
251 * Note: ifmgd->uapsd_queues access is racy here. If the value is
252 * changed via debugfs, user needs to reassociate manually to have
253 * everything in sync.
255 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
256 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
257 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
260 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
261 ieee80211_stop_queues_by_reason(&local->hw,
262 IEEE80211_MAX_QUEUE_MAP,
263 IEEE80211_QUEUE_STOP_REASON_PS,
265 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
266 ieee80211_queue_work(&local->hw,
267 &local->dynamic_ps_disable_work);
270 /* Don't restart the timer if we're not disassociated */
271 if (!ifmgd->associated)
274 mod_timer(&local->dynamic_ps_timer, jiffies +
275 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
280 static ieee80211_tx_result debug_noinline
281 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
288 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
291 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
292 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
293 !ieee80211_is_probe_req(hdr->frame_control) &&
294 !ieee80211_is_nullfunc(hdr->frame_control))
296 * When software scanning only nullfunc frames (to notify
297 * the sleep state to the AP) and probe requests (for the
298 * active scan) are allowed, all other frames should not be
299 * sent and we should not get here, but if we do
300 * nonetheless, drop them to avoid sending them
301 * off-channel. See the link below and
302 * ieee80211_start_scan() for more.
304 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
308 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
311 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
314 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
317 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
321 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
323 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
324 if (unlikely(!assoc &&
325 ieee80211_is_data(hdr->frame_control))) {
326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
327 sdata_info(tx->sdata,
328 "dropped data frame to not associated station %pM\n",
331 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
334 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
335 ieee80211_is_data(hdr->frame_control) &&
336 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
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);
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 dev_kfree_skb(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_mgmt(hdr->frame_control) &&
597 is_multicast_ether_addr(hdr->addr1) &&
598 ieee80211_is_robust_mgmt_frame(tx->skb) &&
599 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
601 else if (is_multicast_ether_addr(hdr->addr1) &&
602 (key = rcu_dereference(tx->sdata->default_multicast_key)))
604 else if (!is_multicast_ether_addr(hdr->addr1) &&
605 (key = rcu_dereference(tx->sdata->default_unicast_key)))
611 bool skip_hw = false;
613 tx->key->tx_rx_count++;
614 /* TODO: add threshold stuff again */
616 switch (tx->key->conf.cipher) {
617 case WLAN_CIPHER_SUITE_WEP40:
618 case WLAN_CIPHER_SUITE_WEP104:
619 case WLAN_CIPHER_SUITE_TKIP:
620 if (!ieee80211_is_data_present(hdr->frame_control))
623 case WLAN_CIPHER_SUITE_CCMP:
624 case WLAN_CIPHER_SUITE_CCMP_256:
625 case WLAN_CIPHER_SUITE_GCMP:
626 case WLAN_CIPHER_SUITE_GCMP_256:
627 if (!ieee80211_is_data_present(hdr->frame_control) &&
628 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
632 skip_hw = (tx->key->conf.flags &
633 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
634 ieee80211_is_mgmt(hdr->frame_control);
636 case WLAN_CIPHER_SUITE_AES_CMAC:
637 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
638 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
639 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
640 if (!ieee80211_is_mgmt(hdr->frame_control))
645 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
646 !ieee80211_is_deauth(hdr->frame_control)))
649 if (!skip_hw && tx->key &&
650 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
651 info->control.hw_key = &tx->key->conf;
657 static ieee80211_tx_result debug_noinline
658 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
660 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
661 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
662 struct ieee80211_supported_band *sband;
664 struct ieee80211_tx_rate_control txrc;
665 struct ieee80211_sta_rates *ratetbl = NULL;
668 memset(&txrc, 0, sizeof(txrc));
670 sband = tx->local->hw.wiphy->bands[info->band];
672 len = min_t(u32, tx->skb->len + FCS_LEN,
673 tx->local->hw.wiphy->frag_threshold);
675 /* set up the tx rate control struct we give the RC algo */
676 txrc.hw = &tx->local->hw;
678 txrc.bss_conf = &tx->sdata->vif.bss_conf;
680 txrc.reported_rate.idx = -1;
681 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
682 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
683 txrc.max_rate_idx = -1;
685 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
687 if (tx->sdata->rc_has_mcs_mask[info->band])
688 txrc.rate_idx_mcs_mask =
689 tx->sdata->rc_rateidx_mcs_mask[info->band];
691 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
692 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
693 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
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;
717 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
720 * Lets not bother rate control if we're associated and cannot
721 * talk to the sta. This should not happen.
723 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
724 !rate_usable_index_exists(sband, &tx->sta->sta),
725 "%s: Dropped data frame as no usable bitrate found while "
726 "scanning and associated. Target station: "
727 "%pM on %d GHz band\n",
728 tx->sdata->name, hdr->addr1,
733 * If we're associated with the sta at this point we know we can at
734 * least send the frame at the lowest bit rate.
736 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
738 if (tx->sta && !info->control.skip_table)
739 ratetbl = rcu_dereference(tx->sta->sta.rates);
741 if (unlikely(info->control.rates[0].idx < 0)) {
743 struct ieee80211_tx_rate rate = {
744 .idx = ratetbl->rate[0].idx,
745 .flags = ratetbl->rate[0].flags,
746 .count = ratetbl->rate[0].count
749 if (ratetbl->rate[0].idx < 0)
757 tx->rate = info->control.rates[0];
760 if (txrc.reported_rate.idx < 0) {
761 txrc.reported_rate = tx->rate;
762 if (tx->sta && ieee80211_is_data(hdr->frame_control))
763 tx->sta->last_tx_rate = txrc.reported_rate;
765 tx->sta->last_tx_rate = txrc.reported_rate;
770 if (unlikely(!info->control.rates[0].count))
771 info->control.rates[0].count = 1;
773 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
774 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
775 info->control.rates[0].count = 1;
780 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
782 u16 *seq = &sta->tid_seq[tid];
783 __le16 ret = cpu_to_le16(*seq);
785 /* Increase the sequence number. */
786 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
791 static ieee80211_tx_result debug_noinline
792 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
794 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
795 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
800 * Packet injection may want to control the sequence
801 * number, if we have no matching interface then we
802 * neither assign one ourselves nor ask the driver to.
804 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
807 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
810 if (ieee80211_hdrlen(hdr->frame_control) < 24)
813 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
817 * Anything but QoS data that has a sequence number field
818 * (is long enough) gets a sequence number from the global
819 * counter. QoS data frames with a multicast destination
820 * also use the global counter (802.11-2012 9.3.2.10).
822 if (!ieee80211_is_data_qos(hdr->frame_control) ||
823 is_multicast_ether_addr(hdr->addr1)) {
824 /* driver should assign sequence number */
825 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
826 /* for pure STA mode without beacons, we can do it */
827 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
828 tx->sdata->sequence_number += 0x10;
830 tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++;
835 * This should be true for injected/management frames only, for
836 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
837 * above since they are not QoS-data frames.
842 /* include per-STA, per-TID sequence counter */
844 qc = ieee80211_get_qos_ctl(hdr);
845 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
846 tx->sta->tx_msdu[tid]++;
848 if (!tx->sta->sta.txq[0])
849 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
854 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
855 struct sk_buff *skb, int hdrlen,
858 struct ieee80211_local *local = tx->local;
859 struct ieee80211_tx_info *info;
861 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
862 int pos = hdrlen + per_fragm;
863 int rem = skb->len - hdrlen - per_fragm;
865 if (WARN_ON(rem < 0))
868 /* first fragment was already added to queue by caller */
871 int fraglen = per_fragm;
876 tmp = dev_alloc_skb(local->tx_headroom +
878 tx->sdata->encrypt_headroom +
879 IEEE80211_ENCRYPT_TAILROOM);
883 __skb_queue_tail(&tx->skbs, tmp);
886 local->tx_headroom + tx->sdata->encrypt_headroom);
888 /* copy control information */
889 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
891 info = IEEE80211_SKB_CB(tmp);
892 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
893 IEEE80211_TX_CTL_FIRST_FRAGMENT);
896 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
898 skb_copy_queue_mapping(tmp, skb);
899 tmp->priority = skb->priority;
902 /* copy header and data */
903 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
904 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
909 /* adjust first fragment's length */
910 skb_trim(skb, hdrlen + per_fragm);
914 static ieee80211_tx_result debug_noinline
915 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
917 struct sk_buff *skb = tx->skb;
918 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
919 struct ieee80211_hdr *hdr = (void *)skb->data;
920 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
924 /* no matter what happens, tx->skb moves to tx->skbs */
925 __skb_queue_tail(&tx->skbs, skb);
928 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
931 if (tx->local->ops->set_frag_threshold)
935 * Warn when submitting a fragmented A-MPDU frame and drop it.
936 * This scenario is handled in ieee80211_tx_prepare but extra
937 * caution taken here as fragmented ampdu may cause Tx stop.
939 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
942 hdrlen = ieee80211_hdrlen(hdr->frame_control);
944 /* internal error, why isn't DONTFRAG set? */
945 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
949 * Now fragment the frame. This will allocate all the fragments and
950 * chain them (using skb as the first fragment) to skb->next.
951 * During transmission, we will remove the successfully transmitted
952 * fragments from this list. When the low-level driver rejects one
953 * of the fragments then we will simply pretend to accept the skb
954 * but store it away as pending.
956 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
959 /* update duration/seq/flags of fragments */
962 skb_queue_walk(&tx->skbs, skb) {
963 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
965 hdr = (void *)skb->data;
966 info = IEEE80211_SKB_CB(skb);
968 if (!skb_queue_is_last(&tx->skbs, skb)) {
969 hdr->frame_control |= morefrags;
971 * No multi-rate retries for fragmented frames, that
972 * would completely throw off the NAV at other STAs.
974 info->control.rates[1].idx = -1;
975 info->control.rates[2].idx = -1;
976 info->control.rates[3].idx = -1;
977 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
978 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
980 hdr->frame_control &= ~morefrags;
982 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
989 static ieee80211_tx_result debug_noinline
990 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
998 skb_queue_walk(&tx->skbs, skb) {
999 ac = skb_get_queue_mapping(skb);
1000 tx->sta->tx_bytes[ac] += skb->len;
1003 tx->sta->tx_packets[ac]++;
1008 static ieee80211_tx_result debug_noinline
1009 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1014 switch (tx->key->conf.cipher) {
1015 case WLAN_CIPHER_SUITE_WEP40:
1016 case WLAN_CIPHER_SUITE_WEP104:
1017 return ieee80211_crypto_wep_encrypt(tx);
1018 case WLAN_CIPHER_SUITE_TKIP:
1019 return ieee80211_crypto_tkip_encrypt(tx);
1020 case WLAN_CIPHER_SUITE_CCMP:
1021 return ieee80211_crypto_ccmp_encrypt(
1022 tx, IEEE80211_CCMP_MIC_LEN);
1023 case WLAN_CIPHER_SUITE_CCMP_256:
1024 return ieee80211_crypto_ccmp_encrypt(
1025 tx, IEEE80211_CCMP_256_MIC_LEN);
1026 case WLAN_CIPHER_SUITE_AES_CMAC:
1027 return ieee80211_crypto_aes_cmac_encrypt(tx);
1028 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1029 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1030 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1031 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1032 return ieee80211_crypto_aes_gmac_encrypt(tx);
1033 case WLAN_CIPHER_SUITE_GCMP:
1034 case WLAN_CIPHER_SUITE_GCMP_256:
1035 return ieee80211_crypto_gcmp_encrypt(tx);
1037 return ieee80211_crypto_hw_encrypt(tx);
1043 static ieee80211_tx_result debug_noinline
1044 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1046 struct sk_buff *skb;
1047 struct ieee80211_hdr *hdr;
1051 skb_queue_walk(&tx->skbs, skb) {
1052 hdr = (void *) skb->data;
1053 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1054 break; /* must not overwrite AID */
1055 if (!skb_queue_is_last(&tx->skbs, skb)) {
1056 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1057 next_len = next->len;
1060 group_addr = is_multicast_ether_addr(hdr->addr1);
1063 ieee80211_duration(tx, skb, group_addr, next_len);
1069 /* actual transmit path */
1071 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1072 struct sk_buff *skb,
1073 struct ieee80211_tx_info *info,
1074 struct tid_ampdu_tx *tid_tx,
1077 bool queued = false;
1078 bool reset_agg_timer = false;
1079 struct sk_buff *purge_skb = NULL;
1081 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1082 info->flags |= IEEE80211_TX_CTL_AMPDU;
1083 reset_agg_timer = true;
1084 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1086 * nothing -- this aggregation session is being started
1087 * but that might still fail with the driver
1089 } else if (!tx->sta->sta.txq[tid]) {
1090 spin_lock(&tx->sta->lock);
1092 * Need to re-check now, because we may get here
1094 * 1) in the window during which the setup is actually
1095 * already done, but not marked yet because not all
1096 * packets are spliced over to the driver pending
1097 * queue yet -- if this happened we acquire the lock
1098 * either before or after the splice happens, but
1099 * need to recheck which of these cases happened.
1101 * 2) during session teardown, if the OPERATIONAL bit
1102 * was cleared due to the teardown but the pointer
1103 * hasn't been assigned NULL yet (or we loaded it
1104 * before it was assigned) -- in this case it may
1105 * now be NULL which means we should just let the
1106 * packet pass through because splicing the frames
1107 * back is already done.
1109 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1112 /* do nothing, let packet pass through */
1113 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1114 info->flags |= IEEE80211_TX_CTL_AMPDU;
1115 reset_agg_timer = true;
1118 info->control.vif = &tx->sdata->vif;
1119 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1120 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS |
1121 IEEE80211_TX_CTL_NO_PS_BUFFER |
1122 IEEE80211_TX_STATUS_EOSP;
1123 __skb_queue_tail(&tid_tx->pending, skb);
1124 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1125 purge_skb = __skb_dequeue(&tid_tx->pending);
1127 spin_unlock(&tx->sta->lock);
1130 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1133 /* reset session timer */
1134 if (reset_agg_timer && tid_tx->timeout)
1135 tid_tx->last_tx = jiffies;
1142 * pass %NULL for the station if unknown, a valid pointer if known
1143 * or an ERR_PTR() if the station is known not to exist
1145 static ieee80211_tx_result
1146 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1147 struct ieee80211_tx_data *tx,
1148 struct sta_info *sta, struct sk_buff *skb)
1150 struct ieee80211_local *local = sdata->local;
1151 struct ieee80211_hdr *hdr;
1152 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1156 memset(tx, 0, sizeof(*tx));
1160 __skb_queue_head_init(&tx->skbs);
1163 * If this flag is set to true anywhere, and we get here,
1164 * we are doing the needed processing, so remove the flag
1167 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1169 hdr = (struct ieee80211_hdr *) skb->data;
1175 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1176 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1177 if (!tx->sta && sdata->wdev.use_4addr)
1179 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1180 IEEE80211_TX_CTL_INJECTED) ||
1181 tx->sdata->control_port_protocol == tx->skb->protocol) {
1182 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1184 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1185 tx->sta = sta_info_get(sdata, hdr->addr1);
1188 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1189 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1190 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1191 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1192 struct tid_ampdu_tx *tid_tx;
1194 qc = ieee80211_get_qos_ctl(hdr);
1195 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1197 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1201 queued = ieee80211_tx_prep_agg(tx, skb, info,
1204 if (unlikely(queued))
1209 if (is_multicast_ether_addr(hdr->addr1)) {
1210 tx->flags &= ~IEEE80211_TX_UNICAST;
1211 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1213 tx->flags |= IEEE80211_TX_UNICAST;
1215 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1216 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1217 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1218 info->flags & IEEE80211_TX_CTL_AMPDU)
1219 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1223 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1224 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1225 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1227 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1232 static void ieee80211_drv_tx(struct ieee80211_local *local,
1233 struct ieee80211_vif *vif,
1234 struct ieee80211_sta *pubsta,
1235 struct sk_buff *skb)
1237 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1238 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1239 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1240 struct ieee80211_tx_control control = {
1243 struct ieee80211_txq *txq = NULL;
1244 struct txq_info *txqi;
1247 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)
1250 if (!ieee80211_is_data(hdr->frame_control))
1254 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1256 txq = pubsta->txq[tid];
1265 txqi = to_txq_info(txq);
1266 atomic_inc(&sdata->txqs_len[ac]);
1267 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)
1268 netif_stop_subqueue(sdata->dev, ac);
1270 skb_queue_tail(&txqi->queue, skb);
1271 drv_wake_tx_queue(local, txqi);
1276 drv_tx(local, &control, skb);
1279 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
1280 struct ieee80211_txq *txq)
1282 struct ieee80211_local *local = hw_to_local(hw);
1283 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
1284 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
1285 struct ieee80211_hdr *hdr;
1286 struct sk_buff *skb = NULL;
1289 spin_lock_bh(&txqi->queue.lock);
1291 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
1294 skb = __skb_dequeue(&txqi->queue);
1298 atomic_dec(&sdata->txqs_len[ac]);
1299 if (__netif_subqueue_stopped(sdata->dev, ac))
1300 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);
1302 hdr = (struct ieee80211_hdr *)skb->data;
1303 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1304 struct sta_info *sta = container_of(txq->sta, struct sta_info,
1306 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1308 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
1309 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
1310 info->flags |= IEEE80211_TX_CTL_AMPDU;
1312 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1316 spin_unlock_bh(&txqi->queue.lock);
1320 EXPORT_SYMBOL(ieee80211_tx_dequeue);
1322 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1323 struct ieee80211_vif *vif,
1324 struct ieee80211_sta *sta,
1325 struct sk_buff_head *skbs,
1328 struct sk_buff *skb, *tmp;
1329 unsigned long flags;
1331 skb_queue_walk_safe(skbs, skb, tmp) {
1332 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1333 int q = info->hw_queue;
1335 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1336 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1337 __skb_unlink(skb, skbs);
1338 ieee80211_free_txskb(&local->hw, skb);
1343 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1344 if (local->queue_stop_reasons[q] ||
1345 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1346 if (unlikely(info->flags &
1347 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1348 if (local->queue_stop_reasons[q] &
1349 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1351 * Drop off-channel frames if queues
1352 * are stopped for any reason other
1353 * than off-channel operation. Never
1356 spin_unlock_irqrestore(
1357 &local->queue_stop_reason_lock,
1359 ieee80211_purge_tx_queue(&local->hw,
1366 * Since queue is stopped, queue up frames for
1367 * later transmission from the tx-pending
1368 * tasklet when the queue is woken again.
1371 skb_queue_splice_init(skbs,
1372 &local->pending[q]);
1374 skb_queue_splice_tail_init(skbs,
1375 &local->pending[q]);
1377 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1382 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1384 info->control.vif = vif;
1386 __skb_unlink(skb, skbs);
1387 ieee80211_drv_tx(local, vif, sta, skb);
1394 * Returns false if the frame couldn't be transmitted but was queued instead.
1396 static bool __ieee80211_tx(struct ieee80211_local *local,
1397 struct sk_buff_head *skbs, int led_len,
1398 struct sta_info *sta, bool txpending)
1400 struct ieee80211_tx_info *info;
1401 struct ieee80211_sub_if_data *sdata;
1402 struct ieee80211_vif *vif;
1403 struct ieee80211_sta *pubsta;
1404 struct sk_buff *skb;
1408 if (WARN_ON(skb_queue_empty(skbs)))
1411 skb = skb_peek(skbs);
1412 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1413 info = IEEE80211_SKB_CB(skb);
1414 sdata = vif_to_sdata(info->control.vif);
1415 if (sta && !sta->uploaded)
1423 switch (sdata->vif.type) {
1424 case NL80211_IFTYPE_MONITOR:
1425 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1429 sdata = rcu_dereference(local->monitor_sdata);
1433 vif->hw_queue[skb_get_queue_mapping(skb)];
1434 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1440 case NL80211_IFTYPE_AP_VLAN:
1441 sdata = container_of(sdata->bss,
1442 struct ieee80211_sub_if_data, u.ap);
1449 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1452 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1454 WARN_ON_ONCE(!skb_queue_empty(skbs));
1460 * Invoke TX handlers, return 0 on success and non-zero if the
1461 * frame was dropped or queued.
1463 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1465 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1466 ieee80211_tx_result res = TX_DROP;
1468 #define CALL_TXH(txh) \
1471 if (res != TX_CONTINUE) \
1475 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1476 CALL_TXH(ieee80211_tx_h_check_assoc);
1477 CALL_TXH(ieee80211_tx_h_ps_buf);
1478 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1479 CALL_TXH(ieee80211_tx_h_select_key);
1480 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1481 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1483 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1484 __skb_queue_tail(&tx->skbs, tx->skb);
1489 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1490 CALL_TXH(ieee80211_tx_h_sequence);
1491 CALL_TXH(ieee80211_tx_h_fragment);
1492 /* handlers after fragment must be aware of tx info fragmentation! */
1493 CALL_TXH(ieee80211_tx_h_stats);
1494 CALL_TXH(ieee80211_tx_h_encrypt);
1495 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1496 CALL_TXH(ieee80211_tx_h_calculate_duration);
1500 if (unlikely(res == TX_DROP)) {
1501 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1503 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1505 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1507 } else if (unlikely(res == TX_QUEUED)) {
1508 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1515 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1516 struct ieee80211_vif *vif, struct sk_buff *skb,
1517 int band, struct ieee80211_sta **sta)
1519 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1520 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1521 struct ieee80211_tx_data tx;
1522 struct sk_buff *skb2;
1524 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1528 info->control.vif = vif;
1529 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1531 if (invoke_tx_handlers(&tx))
1536 *sta = &tx.sta->sta;
1541 /* this function isn't suitable for fragmented data frames */
1542 skb2 = __skb_dequeue(&tx.skbs);
1543 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1544 ieee80211_free_txskb(hw, skb2);
1545 ieee80211_purge_tx_queue(hw, &tx.skbs);
1551 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1554 * Returns false if the frame couldn't be transmitted but was queued instead.
1556 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1557 struct sta_info *sta, struct sk_buff *skb,
1560 struct ieee80211_local *local = sdata->local;
1561 struct ieee80211_tx_data tx;
1562 ieee80211_tx_result res_prepare;
1563 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1567 if (unlikely(skb->len < 10)) {
1572 /* initialises tx */
1574 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1576 if (unlikely(res_prepare == TX_DROP)) {
1577 ieee80211_free_txskb(&local->hw, skb);
1579 } else if (unlikely(res_prepare == TX_QUEUED)) {
1583 /* set up hw_queue value early */
1584 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1585 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1587 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1589 if (!invoke_tx_handlers(&tx))
1590 result = __ieee80211_tx(local, &tx.skbs, led_len,
1596 /* device xmit handlers */
1598 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1599 struct sk_buff *skb,
1600 int head_need, bool may_encrypt)
1602 struct ieee80211_local *local = sdata->local;
1605 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1606 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1607 tail_need -= skb_tailroom(skb);
1608 tail_need = max_t(int, tail_need, 0);
1611 if (skb_cloned(skb) &&
1612 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1613 !skb_clone_writable(skb, ETH_HLEN) ||
1614 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1615 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1616 else if (head_need || tail_need)
1617 I802_DEBUG_INC(local->tx_expand_skb_head);
1621 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1622 wiphy_debug(local->hw.wiphy,
1623 "failed to reallocate TX buffer\n");
1630 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1631 struct sta_info *sta, struct sk_buff *skb)
1633 struct ieee80211_local *local = sdata->local;
1634 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1635 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1639 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1641 headroom = local->tx_headroom;
1643 headroom += sdata->encrypt_headroom;
1644 headroom -= skb_headroom(skb);
1645 headroom = max_t(int, 0, headroom);
1647 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1648 ieee80211_free_txskb(&local->hw, skb);
1652 hdr = (struct ieee80211_hdr *) skb->data;
1653 info->control.vif = &sdata->vif;
1655 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1656 if (ieee80211_is_data(hdr->frame_control) &&
1657 is_unicast_ether_addr(hdr->addr1)) {
1658 if (mesh_nexthop_resolve(sdata, skb))
1659 return; /* skb queued: don't free */
1661 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1665 ieee80211_set_qos_hdr(sdata, skb);
1666 ieee80211_tx(sdata, sta, skb, false);
1669 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1671 struct ieee80211_radiotap_iterator iterator;
1672 struct ieee80211_radiotap_header *rthdr =
1673 (struct ieee80211_radiotap_header *) skb->data;
1674 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1675 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1679 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1680 IEEE80211_TX_CTL_DONTFRAG;
1683 * for every radiotap entry that is present
1684 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1685 * entries present, or -EINVAL on error)
1689 ret = ieee80211_radiotap_iterator_next(&iterator);
1694 /* see if this argument is something we can use */
1695 switch (iterator.this_arg_index) {
1697 * You must take care when dereferencing iterator.this_arg
1698 * for multibyte types... the pointer is not aligned. Use
1699 * get_unaligned((type *)iterator.this_arg) to dereference
1700 * iterator.this_arg for type "type" safely on all arches.
1702 case IEEE80211_RADIOTAP_FLAGS:
1703 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1705 * this indicates that the skb we have been
1706 * handed has the 32-bit FCS CRC at the end...
1707 * we should react to that by snipping it off
1708 * because it will be recomputed and added
1711 if (skb->len < (iterator._max_length + FCS_LEN))
1714 skb_trim(skb, skb->len - FCS_LEN);
1716 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1717 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1718 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1719 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1722 case IEEE80211_RADIOTAP_TX_FLAGS:
1723 txflags = get_unaligned_le16(iterator.this_arg);
1724 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1725 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1729 * Please update the file
1730 * Documentation/networking/mac80211-injection.txt
1731 * when parsing new fields here.
1739 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1743 * remove the radiotap header
1744 * iterator->_max_length was sanity-checked against
1745 * skb->len by iterator init
1747 skb_pull(skb, iterator._max_length);
1752 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1753 struct net_device *dev)
1755 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1756 struct ieee80211_chanctx_conf *chanctx_conf;
1757 struct ieee80211_radiotap_header *prthdr =
1758 (struct ieee80211_radiotap_header *)skb->data;
1759 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1760 struct ieee80211_hdr *hdr;
1761 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1762 struct cfg80211_chan_def *chandef;
1766 /* check for not even having the fixed radiotap header part */
1767 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1768 goto fail; /* too short to be possibly valid */
1770 /* is it a header version we can trust to find length from? */
1771 if (unlikely(prthdr->it_version))
1772 goto fail; /* only version 0 is supported */
1774 /* then there must be a radiotap header with a length we can use */
1775 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1777 /* does the skb contain enough to deliver on the alleged length? */
1778 if (unlikely(skb->len < len_rthdr))
1779 goto fail; /* skb too short for claimed rt header extent */
1782 * fix up the pointers accounting for the radiotap
1783 * header still being in there. We are being given
1784 * a precooked IEEE80211 header so no need for
1787 skb_set_mac_header(skb, len_rthdr);
1789 * these are just fixed to the end of the rt area since we
1790 * don't have any better information and at this point, nobody cares
1792 skb_set_network_header(skb, len_rthdr);
1793 skb_set_transport_header(skb, len_rthdr);
1795 if (skb->len < len_rthdr + 2)
1798 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1799 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1801 if (skb->len < len_rthdr + hdrlen)
1805 * Initialize skb->protocol if the injected frame is a data frame
1806 * carrying a rfc1042 header
1808 if (ieee80211_is_data(hdr->frame_control) &&
1809 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1810 u8 *payload = (u8 *)hdr + hdrlen;
1812 if (ether_addr_equal(payload, rfc1042_header))
1813 skb->protocol = cpu_to_be16((payload[6] << 8) |
1817 memset(info, 0, sizeof(*info));
1819 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1820 IEEE80211_TX_CTL_INJECTED;
1822 /* process and remove the injection radiotap header */
1823 if (!ieee80211_parse_tx_radiotap(skb))
1829 * We process outgoing injected frames that have a local address
1830 * we handle as though they are non-injected frames.
1831 * This code here isn't entirely correct, the local MAC address
1832 * isn't always enough to find the interface to use; for proper
1833 * VLAN/WDS support we will need a different mechanism (which
1834 * likely isn't going to be monitor interfaces).
1836 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1838 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1839 if (!ieee80211_sdata_running(tmp_sdata))
1841 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1842 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1843 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1845 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1851 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1852 if (!chanctx_conf) {
1853 tmp_sdata = rcu_dereference(local->monitor_sdata);
1856 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1860 chandef = &chanctx_conf->def;
1861 else if (!local->use_chanctx)
1862 chandef = &local->_oper_chandef;
1867 * Frame injection is not allowed if beaconing is not allowed
1868 * or if we need radar detection. Beaconing is usually not allowed when
1869 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1870 * Passive scan is also used in world regulatory domains where
1871 * your country is not known and as such it should be treated as
1872 * NO TX unless the channel is explicitly allowed in which case
1873 * your current regulatory domain would not have the passive scan
1876 * Since AP mode uses monitor interfaces to inject/TX management
1877 * frames we can make AP mode the exception to this rule once it
1878 * supports radar detection as its implementation can deal with
1879 * radar detection by itself. We can do that later by adding a
1880 * monitor flag interfaces used for AP support.
1882 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1886 info->band = chandef->chan->band;
1887 ieee80211_xmit(sdata, NULL, skb);
1890 return NETDEV_TX_OK;
1896 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1899 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
1901 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
1903 return ethertype == ETH_P_TDLS &&
1905 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1908 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
1909 struct sk_buff *skb,
1910 struct sta_info **sta_out)
1912 struct sta_info *sta;
1914 switch (sdata->vif.type) {
1915 case NL80211_IFTYPE_AP_VLAN:
1916 sta = rcu_dereference(sdata->u.vlan.sta);
1920 } else if (sdata->wdev.use_4addr) {
1924 case NL80211_IFTYPE_AP:
1925 case NL80211_IFTYPE_OCB:
1926 case NL80211_IFTYPE_ADHOC:
1927 if (is_multicast_ether_addr(skb->data)) {
1928 *sta_out = ERR_PTR(-ENOENT);
1931 sta = sta_info_get_bss(sdata, skb->data);
1933 case NL80211_IFTYPE_WDS:
1934 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
1936 #ifdef CONFIG_MAC80211_MESH
1937 case NL80211_IFTYPE_MESH_POINT:
1938 /* determined much later */
1942 case NL80211_IFTYPE_STATION:
1943 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1944 sta = sta_info_get(sdata, skb->data);
1946 bool tdls_peer, tdls_auth;
1948 tdls_peer = test_sta_flag(sta,
1949 WLAN_STA_TDLS_PEER);
1950 tdls_auth = test_sta_flag(sta,
1951 WLAN_STA_TDLS_PEER_AUTH);
1953 if (tdls_peer && tdls_auth) {
1959 * TDLS link during setup - throw out frames to
1960 * peer. Allow TDLS-setup frames to unauthorized
1961 * peers for the special case of a link teardown
1962 * after a TDLS sta is removed due to being
1965 if (tdls_peer && !tdls_auth &&
1966 !ieee80211_is_tdls_setup(skb))
1972 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
1980 *sta_out = sta ?: ERR_PTR(-ENOENT);
1985 * ieee80211_build_hdr - build 802.11 header in the given frame
1986 * @sdata: virtual interface to build the header for
1987 * @skb: the skb to build the header in
1988 * @info_flags: skb flags to set
1990 * This function takes the skb with 802.3 header and reformats the header to
1991 * the appropriate IEEE 802.11 header based on which interface the packet is
1992 * being transmitted on.
1994 * Note that this function also takes care of the TX status request and
1995 * potential unsharing of the SKB - this needs to be interleaved with the
1998 * The function requires the read-side RCU lock held
2000 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2002 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2003 struct sk_buff *skb, u32 info_flags,
2004 struct sta_info *sta)
2006 struct ieee80211_local *local = sdata->local;
2007 struct ieee80211_tx_info *info;
2009 u16 ethertype, hdrlen, meshhdrlen = 0;
2011 struct ieee80211_hdr hdr;
2012 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2013 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2014 const u8 *encaps_data;
2015 int encaps_len, skip_header_bytes;
2017 bool wme_sta = false, authorized = false;
2021 struct ieee80211_chanctx_conf *chanctx_conf;
2022 struct ieee80211_sub_if_data *ap_sdata;
2023 enum ieee80211_band band;
2029 /* convert Ethernet header to proper 802.11 header (based on
2030 * operation mode) */
2031 ethertype = (skb->data[12] << 8) | skb->data[13];
2032 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2034 switch (sdata->vif.type) {
2035 case NL80211_IFTYPE_AP_VLAN:
2036 if (sdata->wdev.use_4addr) {
2037 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2039 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2040 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2041 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2042 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2044 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2045 wme_sta = sta->sta.wme;
2047 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2049 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2050 if (!chanctx_conf) {
2054 band = chanctx_conf->def.chan->band;
2055 if (sdata->wdev.use_4addr)
2058 case NL80211_IFTYPE_AP:
2059 if (sdata->vif.type == NL80211_IFTYPE_AP)
2060 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2061 if (!chanctx_conf) {
2065 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2067 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2068 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2069 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2071 band = chanctx_conf->def.chan->band;
2073 case NL80211_IFTYPE_WDS:
2074 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2076 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2077 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2078 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2079 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2082 * This is the exception! WDS style interfaces are prohibited
2083 * when channel contexts are in used so this must be valid
2085 band = local->hw.conf.chandef.chan->band;
2087 #ifdef CONFIG_MAC80211_MESH
2088 case NL80211_IFTYPE_MESH_POINT:
2089 if (!is_multicast_ether_addr(skb->data)) {
2090 struct sta_info *next_hop;
2091 bool mpp_lookup = true;
2093 mpath = mesh_path_lookup(sdata, skb->data);
2096 next_hop = rcu_dereference(mpath->next_hop);
2098 !(mpath->flags & (MESH_PATH_ACTIVE |
2099 MESH_PATH_RESOLVING)))
2104 mppath = mpp_path_lookup(sdata, skb->data);
2106 if (mppath && mpath)
2107 mesh_path_del(mpath->sdata, mpath->dst);
2111 * Use address extension if it is a packet from
2112 * another interface or if we know the destination
2113 * is being proxied by a portal (i.e. portal address
2114 * differs from proxied address)
2116 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2117 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2118 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2119 skb->data, skb->data + ETH_ALEN);
2120 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2123 /* DS -> MBSS (802.11-2012 13.11.3.3).
2124 * For unicast with unknown forwarding information,
2125 * destination might be in the MBSS or if that fails
2126 * forwarded to another mesh gate. In either case
2127 * resolution will be handled in ieee80211_xmit(), so
2128 * leave the original DA. This also works for mcast */
2129 const u8 *mesh_da = skb->data;
2132 mesh_da = mppath->mpp;
2134 mesh_da = mpath->dst;
2136 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2137 mesh_da, sdata->vif.addr);
2138 if (is_multicast_ether_addr(mesh_da))
2139 /* DA TA mSA AE:SA */
2140 meshhdrlen = ieee80211_new_mesh_header(
2142 skb->data + ETH_ALEN, NULL);
2144 /* RA TA mDA mSA AE:DA SA */
2145 meshhdrlen = ieee80211_new_mesh_header(
2146 sdata, &mesh_hdr, skb->data,
2147 skb->data + ETH_ALEN);
2150 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2151 if (!chanctx_conf) {
2155 band = chanctx_conf->def.chan->band;
2158 case NL80211_IFTYPE_STATION:
2159 /* we already did checks when looking up the RA STA */
2160 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2164 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2165 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2166 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2168 } else if (sdata->u.mgd.use_4addr &&
2169 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2170 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2171 IEEE80211_FCTL_TODS);
2173 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2174 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2175 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2176 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2179 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2181 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2182 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2183 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2186 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2187 if (!chanctx_conf) {
2191 band = chanctx_conf->def.chan->band;
2193 case NL80211_IFTYPE_OCB:
2195 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2196 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2197 eth_broadcast_addr(hdr.addr3);
2199 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2200 if (!chanctx_conf) {
2204 band = chanctx_conf->def.chan->band;
2206 case NL80211_IFTYPE_ADHOC:
2208 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2209 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2210 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2212 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2213 if (!chanctx_conf) {
2217 band = chanctx_conf->def.chan->band;
2224 multicast = is_multicast_ether_addr(hdr.addr1);
2226 /* sta is always NULL for mesh */
2228 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2229 wme_sta = sta->sta.wme;
2230 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2231 /* For mesh, the use of the QoS header is mandatory */
2235 /* receiver does QoS (which also means we do) use it */
2237 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2242 * Drop unicast frames to unauthorised stations unless they are
2243 * EAPOL frames from the local station.
2245 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2246 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2247 !multicast && !authorized &&
2248 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2249 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2250 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2251 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2252 sdata->name, hdr.addr1);
2255 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2261 if (unlikely(!multicast && skb->sk &&
2262 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2263 struct sk_buff *ack_skb = skb_clone_sk(skb);
2266 unsigned long flags;
2269 spin_lock_irqsave(&local->ack_status_lock, flags);
2270 id = idr_alloc(&local->ack_status_frames, ack_skb,
2271 1, 0x10000, GFP_ATOMIC);
2272 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2276 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2284 * If the skb is shared we need to obtain our own copy.
2286 if (skb_shared(skb)) {
2287 struct sk_buff *tmp_skb = skb;
2289 /* can't happen -- skb is a clone if info_id != 0 */
2292 skb = skb_clone(skb, GFP_ATOMIC);
2301 hdr.frame_control = fc;
2302 hdr.duration_id = 0;
2305 skip_header_bytes = ETH_HLEN;
2306 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2307 encaps_data = bridge_tunnel_header;
2308 encaps_len = sizeof(bridge_tunnel_header);
2309 skip_header_bytes -= 2;
2310 } else if (ethertype >= ETH_P_802_3_MIN) {
2311 encaps_data = rfc1042_header;
2312 encaps_len = sizeof(rfc1042_header);
2313 skip_header_bytes -= 2;
2319 nh_pos = skb_network_header(skb) - skb->data;
2320 h_pos = skb_transport_header(skb) - skb->data;
2322 skb_pull(skb, skip_header_bytes);
2323 nh_pos -= skip_header_bytes;
2324 h_pos -= skip_header_bytes;
2326 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2329 * So we need to modify the skb header and hence need a copy of
2330 * that. The head_need variable above doesn't, so far, include
2331 * the needed header space that we don't need right away. If we
2332 * can, then we don't reallocate right now but only after the
2333 * frame arrives at the master device (if it does...)
2335 * If we cannot, however, then we will reallocate to include all
2336 * the ever needed space. Also, if we need to reallocate it anyway,
2337 * make it big enough for everything we may ever need.
2340 if (head_need > 0 || skb_cloned(skb)) {
2341 head_need += sdata->encrypt_headroom;
2342 head_need += local->tx_headroom;
2343 head_need = max_t(int, 0, head_need);
2344 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2345 ieee80211_free_txskb(&local->hw, skb);
2347 return ERR_PTR(-ENOMEM);
2352 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2353 nh_pos += encaps_len;
2354 h_pos += encaps_len;
2357 #ifdef CONFIG_MAC80211_MESH
2358 if (meshhdrlen > 0) {
2359 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2360 nh_pos += meshhdrlen;
2361 h_pos += meshhdrlen;
2365 if (ieee80211_is_data_qos(fc)) {
2366 __le16 *qos_control;
2368 qos_control = (__le16 *) skb_push(skb, 2);
2369 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2371 * Maybe we could actually set some fields here, for now just
2372 * initialise to zero to indicate no special operation.
2376 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2381 /* Update skb pointers to various headers since this modified frame
2382 * is going to go through Linux networking code that may potentially
2383 * need things like pointer to IP header. */
2384 skb_set_mac_header(skb, 0);
2385 skb_set_network_header(skb, nh_pos);
2386 skb_set_transport_header(skb, h_pos);
2388 info = IEEE80211_SKB_CB(skb);
2389 memset(info, 0, sizeof(*info));
2391 info->flags = info_flags;
2392 info->ack_frame_id = info_id;
2398 return ERR_PTR(ret);
2402 * fast-xmit overview
2404 * The core idea of this fast-xmit is to remove per-packet checks by checking
2405 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2406 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2407 * much less work can be done per packet. For example, fragmentation must be
2408 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2411 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2412 * header and other data to aid packet processing in ieee80211_xmit_fast().
2414 * The most difficult part of this is that when any of these assumptions
2415 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2416 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2417 * since the per-packet code no longer checks the conditions. This is reflected
2418 * by the calls to these functions throughout the rest of the code, and must be
2419 * maintained if any of the TX path checks change.
2422 void ieee80211_check_fast_xmit(struct sta_info *sta)
2424 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2425 struct ieee80211_local *local = sta->local;
2426 struct ieee80211_sub_if_data *sdata = sta->sdata;
2427 struct ieee80211_hdr *hdr = (void *)build.hdr;
2428 struct ieee80211_chanctx_conf *chanctx_conf;
2431 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2434 /* Locking here protects both the pointer itself, and against concurrent
2435 * invocations winning data access races to, e.g., the key pointer that
2437 * Without it, the invocation of this function right after the key
2438 * pointer changes wouldn't be sufficient, as another CPU could access
2439 * the pointer, then stall, and then do the cache update after the CPU
2440 * that invalidated the key.
2441 * With the locking, such scenarios cannot happen as the check for the
2442 * key and the fast-tx assignment are done atomically, so the CPU that
2443 * modifies the key will either wait or other one will see the key
2444 * cleared/changed already.
2446 spin_lock_bh(&sta->lock);
2447 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2448 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2449 sdata->vif.type == NL80211_IFTYPE_STATION)
2452 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2455 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2456 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2457 test_sta_flag(sta, WLAN_STA_PS_DELIVER))
2460 if (sdata->noack_map)
2463 /* fast-xmit doesn't handle fragmentation at all */
2464 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2465 !local->ops->set_frag_threshold)
2469 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2470 if (!chanctx_conf) {
2474 build.band = chanctx_conf->def.chan->band;
2477 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2479 switch (sdata->vif.type) {
2480 case NL80211_IFTYPE_ADHOC:
2482 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2483 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2484 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2487 case NL80211_IFTYPE_STATION:
2488 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2490 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2491 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2492 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2497 if (sdata->u.mgd.use_4addr) {
2498 /* non-regular ethertype cannot use the fastpath */
2499 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2500 IEEE80211_FCTL_TODS);
2502 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2503 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2504 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2505 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2509 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2511 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2512 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2513 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2516 case NL80211_IFTYPE_AP_VLAN:
2517 if (sdata->wdev.use_4addr) {
2518 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2519 IEEE80211_FCTL_TODS);
2521 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2522 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2523 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2524 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2529 case NL80211_IFTYPE_AP:
2530 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2532 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2533 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2534 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2538 /* not handled on fast-xmit */
2544 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2547 /* We store the key here so there's no point in using rcu_dereference()
2548 * but that's fine because the code that changes the pointers will call
2549 * this function after doing so. For a single CPU that would be enough,
2550 * for multiple see the comment above.
2552 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2554 build.key = rcu_access_pointer(sdata->default_unicast_key);
2556 bool gen_iv, iv_spc, mmic;
2558 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2559 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2560 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2562 /* don't handle software crypto */
2563 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2566 switch (build.key->conf.cipher) {
2567 case WLAN_CIPHER_SUITE_CCMP:
2568 case WLAN_CIPHER_SUITE_CCMP_256:
2569 /* add fixed key ID */
2571 (build.hdr + build.hdr_len)[3] =
2572 0x20 | (build.key->conf.keyidx << 6);
2573 build.pn_offs = build.hdr_len;
2575 if (gen_iv || iv_spc)
2576 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2578 case WLAN_CIPHER_SUITE_GCMP:
2579 case WLAN_CIPHER_SUITE_GCMP_256:
2580 /* add fixed key ID */
2582 (build.hdr + build.hdr_len)[3] =
2583 0x20 | (build.key->conf.keyidx << 6);
2584 build.pn_offs = build.hdr_len;
2586 if (gen_iv || iv_spc)
2587 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2589 case WLAN_CIPHER_SUITE_TKIP:
2590 /* cannot handle MMIC or IV generation in xmit-fast */
2594 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2596 case WLAN_CIPHER_SUITE_WEP40:
2597 case WLAN_CIPHER_SUITE_WEP104:
2598 /* cannot handle IV generation in fast-xmit */
2602 build.hdr_len += IEEE80211_WEP_IV_LEN;
2604 case WLAN_CIPHER_SUITE_AES_CMAC:
2605 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2606 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2607 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2609 "management cipher suite 0x%x enabled for data\n",
2610 build.key->conf.cipher);
2613 /* we don't know how to generate IVs for this at all */
2614 if (WARN_ON(gen_iv))
2616 /* pure hardware keys are OK, of course */
2617 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2619 /* cipher scheme might require space allocation */
2621 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2624 build.hdr_len += build.key->conf.iv_len;
2627 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2630 hdr->frame_control = fc;
2632 memcpy(build.hdr + build.hdr_len,
2633 rfc1042_header, sizeof(rfc1042_header));
2634 build.hdr_len += sizeof(rfc1042_header);
2636 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2637 /* if the kmemdup fails, continue w/o fast_tx */
2642 /* we might have raced against another call to this function */
2643 old = rcu_dereference_protected(sta->fast_tx,
2644 lockdep_is_held(&sta->lock));
2645 rcu_assign_pointer(sta->fast_tx, fast_tx);
2647 kfree_rcu(old, rcu_head);
2648 spin_unlock_bh(&sta->lock);
2651 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2653 struct sta_info *sta;
2656 list_for_each_entry_rcu(sta, &local->sta_list, list)
2657 ieee80211_check_fast_xmit(sta);
2661 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2663 struct ieee80211_local *local = sdata->local;
2664 struct sta_info *sta;
2668 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2669 if (sdata != sta->sdata &&
2670 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
2672 ieee80211_check_fast_xmit(sta);
2678 void ieee80211_clear_fast_xmit(struct sta_info *sta)
2680 struct ieee80211_fast_tx *fast_tx;
2682 spin_lock_bh(&sta->lock);
2683 fast_tx = rcu_dereference_protected(sta->fast_tx,
2684 lockdep_is_held(&sta->lock));
2685 RCU_INIT_POINTER(sta->fast_tx, NULL);
2686 spin_unlock_bh(&sta->lock);
2689 kfree_rcu(fast_tx, rcu_head);
2692 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
2693 struct net_device *dev, struct sta_info *sta,
2694 struct ieee80211_fast_tx *fast_tx,
2695 struct sk_buff *skb)
2697 struct ieee80211_local *local = sdata->local;
2698 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2699 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
2700 int hw_headroom = sdata->local->hw.extra_tx_headroom;
2702 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2703 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
2704 struct ieee80211_tx_data tx;
2705 ieee80211_tx_result r;
2706 struct tid_ampdu_tx *tid_tx = NULL;
2707 u8 tid = IEEE80211_NUM_TIDS;
2709 /* control port protocol needs a lot of special handling */
2710 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
2713 /* only RFC 1042 SNAP */
2714 if (ethertype < ETH_P_802_3_MIN)
2717 /* don't handle TX status request here either */
2718 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
2721 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2722 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2723 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
2725 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2727 if (tid_tx->timeout)
2728 tid_tx->last_tx = jiffies;
2732 /* after this point (skb is modified) we cannot return false */
2734 if (skb_shared(skb)) {
2735 struct sk_buff *tmp_skb = skb;
2737 skb = skb_clone(skb, GFP_ATOMIC);
2744 ieee80211_tx_stats(dev, skb->len + extra_head);
2746 /* will not be crypto-handled beyond what we do here, so use false
2747 * as the may-encrypt argument for the resize to not account for
2748 * more room than we already have in 'extra_head'
2750 if (unlikely(ieee80211_skb_resize(sdata, skb,
2751 max_t(int, extra_head + hw_headroom -
2752 skb_headroom(skb), 0),
2758 memcpy(ð, skb->data, ETH_HLEN - 2);
2759 hdr = (void *)skb_push(skb, extra_head);
2760 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
2761 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
2762 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
2764 memset(info, 0, sizeof(*info));
2765 info->band = fast_tx->band;
2766 info->control.vif = &sdata->vif;
2767 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
2768 IEEE80211_TX_CTL_DONTFRAG |
2769 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
2771 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2772 *ieee80211_get_qos_ctl(hdr) = tid;
2773 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
2775 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2776 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
2777 sdata->sequence_number += 0x10;
2780 sta->tx_msdu[tid]++;
2782 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
2784 __skb_queue_head_init(&tx.skbs);
2786 tx.flags = IEEE80211_TX_UNICAST;
2790 tx.key = fast_tx->key;
2793 info->control.hw_key = &fast_tx->key->conf;
2795 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
2797 r = ieee80211_tx_h_rate_ctrl(&tx);
2801 if (r != TX_CONTINUE) {
2808 /* statistics normally done by ieee80211_tx_h_stats (but that
2809 * has to consider fragmentation, so is more complex)
2811 sta->tx_bytes[skb_get_queue_mapping(skb)] += skb->len;
2812 sta->tx_packets[skb_get_queue_mapping(skb)]++;
2814 if (fast_tx->pn_offs) {
2816 u8 *crypto_hdr = skb->data + fast_tx->pn_offs;
2818 switch (fast_tx->key->conf.cipher) {
2819 case WLAN_CIPHER_SUITE_CCMP:
2820 case WLAN_CIPHER_SUITE_CCMP_256:
2821 case WLAN_CIPHER_SUITE_GCMP:
2822 case WLAN_CIPHER_SUITE_GCMP_256:
2823 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
2825 crypto_hdr[1] = pn >> 8;
2826 crypto_hdr[4] = pn >> 16;
2827 crypto_hdr[5] = pn >> 24;
2828 crypto_hdr[6] = pn >> 32;
2829 crypto_hdr[7] = pn >> 40;
2834 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2835 sdata = container_of(sdata->bss,
2836 struct ieee80211_sub_if_data, u.ap);
2838 __skb_queue_tail(&tx.skbs, skb);
2839 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
2843 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2844 struct net_device *dev,
2847 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2848 struct sta_info *sta;
2849 struct sk_buff *next;
2851 if (unlikely(skb->len < ETH_HLEN)) {
2858 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
2861 if (!IS_ERR_OR_NULL(sta)) {
2862 struct ieee80211_fast_tx *fast_tx;
2864 fast_tx = rcu_dereference(sta->fast_tx);
2867 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
2871 if (skb_is_gso(skb)) {
2872 struct sk_buff *segs;
2874 segs = skb_gso_segment(skb, 0);
2882 /* we cannot process non-linear frames on this path */
2883 if (skb_linearize(skb)) {
2888 /* the frame could be fragmented, software-encrypted, and other
2889 * things so we cannot really handle checksum offload with it -
2890 * fix it up in software before we handle anything else.
2892 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2893 skb_set_transport_header(skb,
2894 skb_checksum_start_offset(skb));
2895 if (skb_checksum_help(skb))
2908 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2912 ieee80211_tx_stats(dev, skb->len);
2914 ieee80211_xmit(sdata, sta, skb);
2924 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2925 * @skb: packet to be sent
2926 * @dev: incoming interface
2928 * On failure skb will be freed.
2930 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
2931 struct net_device *dev)
2933 __ieee80211_subif_start_xmit(skb, dev, 0);
2934 return NETDEV_TX_OK;
2938 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
2939 struct sk_buff *skb, u32 info_flags)
2941 struct ieee80211_hdr *hdr;
2942 struct ieee80211_tx_data tx = {
2943 .local = sdata->local,
2946 struct sta_info *sta;
2950 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
2952 skb = ERR_PTR(-EINVAL);
2956 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2960 hdr = (void *)skb->data;
2961 tx.sta = sta_info_get(sdata, hdr->addr1);
2964 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
2967 return ERR_PTR(-EINVAL);
2976 * ieee80211_clear_tx_pending may not be called in a context where
2977 * it is possible that it packets could come in again.
2979 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2981 struct sk_buff *skb;
2984 for (i = 0; i < local->hw.queues; i++) {
2985 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2986 ieee80211_free_txskb(&local->hw, skb);
2991 * Returns false if the frame couldn't be transmitted but was queued instead,
2992 * which in this case means re-queued -- take as an indication to stop sending
2993 * more pending frames.
2995 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2996 struct sk_buff *skb)
2998 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2999 struct ieee80211_sub_if_data *sdata;
3000 struct sta_info *sta;
3001 struct ieee80211_hdr *hdr;
3003 struct ieee80211_chanctx_conf *chanctx_conf;
3005 sdata = vif_to_sdata(info->control.vif);
3007 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3008 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3009 if (unlikely(!chanctx_conf)) {
3013 info->band = chanctx_conf->def.chan->band;
3014 result = ieee80211_tx(sdata, NULL, skb, true);
3016 struct sk_buff_head skbs;
3018 __skb_queue_head_init(&skbs);
3019 __skb_queue_tail(&skbs, skb);
3021 hdr = (struct ieee80211_hdr *)skb->data;
3022 sta = sta_info_get(sdata, hdr->addr1);
3024 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3031 * Transmit all pending packets. Called from tasklet.
3033 void ieee80211_tx_pending(unsigned long data)
3035 struct ieee80211_local *local = (struct ieee80211_local *)data;
3036 unsigned long flags;
3042 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3043 for (i = 0; i < local->hw.queues; i++) {
3045 * If queue is stopped by something other than due to pending
3046 * frames, or we have no pending frames, proceed to next queue.
3048 if (local->queue_stop_reasons[i] ||
3049 skb_queue_empty(&local->pending[i]))
3052 while (!skb_queue_empty(&local->pending[i])) {
3053 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3054 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3056 if (WARN_ON(!info->control.vif)) {
3057 ieee80211_free_txskb(&local->hw, skb);
3061 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3064 txok = ieee80211_tx_pending_skb(local, skb);
3065 spin_lock_irqsave(&local->queue_stop_reason_lock,
3071 if (skb_queue_empty(&local->pending[i]))
3072 ieee80211_propagate_queue_wake(local, i);
3074 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3079 /* functions for drivers to get certain frames */
3081 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3082 struct ps_data *ps, struct sk_buff *skb,
3087 int i, have_bits = 0, n1, n2;
3089 /* Generate bitmap for TIM only if there are any STAs in power save
3091 if (atomic_read(&ps->num_sta_ps) > 0)
3092 /* in the hope that this is faster than
3093 * checking byte-for-byte */
3094 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3095 IEEE80211_MAX_AID+1);
3097 if (ps->dtim_count == 0)
3098 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3103 tim = pos = (u8 *) skb_put(skb, 6);
3104 *pos++ = WLAN_EID_TIM;
3106 *pos++ = ps->dtim_count;
3107 *pos++ = sdata->vif.bss_conf.dtim_period;
3109 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3112 ps->dtim_bc_mc = aid0 == 1;
3115 /* Find largest even number N1 so that bits numbered 1 through
3116 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3117 * (N2 + 1) x 8 through 2007 are 0. */
3119 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3126 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3133 /* Bitmap control */
3135 /* Part Virt Bitmap */
3136 skb_put(skb, n2 - n1);
3137 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3139 tim[1] = n2 - n1 + 4;
3141 *pos++ = aid0; /* Bitmap control */
3142 *pos++ = 0; /* Part Virt Bitmap */
3146 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3147 struct ps_data *ps, struct sk_buff *skb,
3150 struct ieee80211_local *local = sdata->local;
3153 * Not very nice, but we want to allow the driver to call
3154 * ieee80211_beacon_get() as a response to the set_tim()
3155 * callback. That, however, is already invoked under the
3156 * sta_lock to guarantee consistent and race-free update
3157 * of the tim bitmap in mac80211 and the driver.
3159 if (local->tim_in_locked_section) {
3160 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3162 spin_lock_bh(&local->tim_lock);
3163 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3164 spin_unlock_bh(&local->tim_lock);
3170 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3171 struct beacon_data *beacon)
3173 struct probe_resp *resp;
3175 size_t beacon_data_len;
3177 u8 count = beacon->csa_current_counter;
3179 switch (sdata->vif.type) {
3180 case NL80211_IFTYPE_AP:
3181 beacon_data = beacon->tail;
3182 beacon_data_len = beacon->tail_len;
3184 case NL80211_IFTYPE_ADHOC:
3185 beacon_data = beacon->head;
3186 beacon_data_len = beacon->head_len;
3188 case NL80211_IFTYPE_MESH_POINT:
3189 beacon_data = beacon->head;
3190 beacon_data_len = beacon->head_len;
3197 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3198 resp = rcu_dereference(sdata->u.ap.probe_resp);
3200 if (beacon->csa_counter_offsets[i]) {
3201 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3207 beacon_data[beacon->csa_counter_offsets[i]] = count;
3210 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3211 resp->data[resp->csa_counter_offsets[i]] = count;
3216 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3218 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3219 struct beacon_data *beacon = NULL;
3224 if (sdata->vif.type == NL80211_IFTYPE_AP)
3225 beacon = rcu_dereference(sdata->u.ap.beacon);
3226 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3227 beacon = rcu_dereference(sdata->u.ibss.presp);
3228 else if (ieee80211_vif_is_mesh(&sdata->vif))
3229 beacon = rcu_dereference(sdata->u.mesh.beacon);
3234 beacon->csa_current_counter--;
3236 /* the counter should never reach 0 */
3237 WARN_ON_ONCE(!beacon->csa_current_counter);
3238 count = beacon->csa_current_counter;
3244 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3246 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3248 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3249 struct beacon_data *beacon = NULL;
3251 size_t beacon_data_len;
3254 if (!ieee80211_sdata_running(sdata))
3258 if (vif->type == NL80211_IFTYPE_AP) {
3259 struct ieee80211_if_ap *ap = &sdata->u.ap;
3261 beacon = rcu_dereference(ap->beacon);
3262 if (WARN_ON(!beacon || !beacon->tail))
3264 beacon_data = beacon->tail;
3265 beacon_data_len = beacon->tail_len;
3266 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3267 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3269 beacon = rcu_dereference(ifibss->presp);
3273 beacon_data = beacon->head;
3274 beacon_data_len = beacon->head_len;
3275 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3276 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3278 beacon = rcu_dereference(ifmsh->beacon);
3282 beacon_data = beacon->head;
3283 beacon_data_len = beacon->head_len;
3289 if (!beacon->csa_counter_offsets[0])
3292 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3295 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3302 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3304 static struct sk_buff *
3305 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3306 struct ieee80211_vif *vif,
3307 struct ieee80211_mutable_offsets *offs,
3310 struct ieee80211_local *local = hw_to_local(hw);
3311 struct beacon_data *beacon = NULL;
3312 struct sk_buff *skb = NULL;
3313 struct ieee80211_tx_info *info;
3314 struct ieee80211_sub_if_data *sdata = NULL;
3315 enum ieee80211_band band;
3316 struct ieee80211_tx_rate_control txrc;
3317 struct ieee80211_chanctx_conf *chanctx_conf;
3318 int csa_off_base = 0;
3322 sdata = vif_to_sdata(vif);
3323 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3325 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3329 memset(offs, 0, sizeof(*offs));
3331 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3332 struct ieee80211_if_ap *ap = &sdata->u.ap;
3334 beacon = rcu_dereference(ap->beacon);
3336 if (beacon->csa_counter_offsets[0]) {
3338 ieee80211_csa_update_counter(vif);
3340 ieee80211_set_csa(sdata, beacon);
3344 * headroom, head length,
3345 * tail length and maximum TIM length
3347 skb = dev_alloc_skb(local->tx_headroom +
3349 beacon->tail_len + 256 +
3350 local->hw.extra_beacon_tailroom);
3354 skb_reserve(skb, local->tx_headroom);
3355 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3358 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3362 offs->tim_offset = beacon->head_len;
3363 offs->tim_length = skb->len - beacon->head_len;
3365 /* for AP the csa offsets are from tail */
3366 csa_off_base = skb->len;
3370 memcpy(skb_put(skb, beacon->tail_len),
3371 beacon->tail, beacon->tail_len);
3374 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
3375 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3376 struct ieee80211_hdr *hdr;
3378 beacon = rcu_dereference(ifibss->presp);
3382 if (beacon->csa_counter_offsets[0]) {
3384 ieee80211_csa_update_counter(vif);
3386 ieee80211_set_csa(sdata, beacon);
3389 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
3390 local->hw.extra_beacon_tailroom);
3393 skb_reserve(skb, local->tx_headroom);
3394 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3397 hdr = (struct ieee80211_hdr *) skb->data;
3398 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3399 IEEE80211_STYPE_BEACON);
3400 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3401 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3403 beacon = rcu_dereference(ifmsh->beacon);
3407 if (beacon->csa_counter_offsets[0]) {
3409 /* TODO: For mesh csa_counter is in TU, so
3410 * decrementing it by one isn't correct, but
3411 * for now we leave it consistent with overall
3412 * mac80211's behavior.
3414 ieee80211_csa_update_counter(vif);
3416 ieee80211_set_csa(sdata, beacon);
3419 if (ifmsh->sync_ops)
3420 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
3422 skb = dev_alloc_skb(local->tx_headroom +
3426 local->hw.extra_beacon_tailroom);
3429 skb_reserve(skb, local->tx_headroom);
3430 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3432 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
3435 offs->tim_offset = beacon->head_len;
3436 offs->tim_length = skb->len - beacon->head_len;
3439 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
3447 if (offs && beacon) {
3450 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
3451 u16 csa_off = beacon->csa_counter_offsets[i];
3456 offs->csa_counter_offs[i] = csa_off_base + csa_off;
3460 band = chanctx_conf->def.chan->band;
3462 info = IEEE80211_SKB_CB(skb);
3464 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
3465 info->flags |= IEEE80211_TX_CTL_NO_ACK;
3468 memset(&txrc, 0, sizeof(txrc));
3470 txrc.sband = local->hw.wiphy->bands[band];
3471 txrc.bss_conf = &sdata->vif.bss_conf;
3473 txrc.reported_rate.idx = -1;
3474 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
3475 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
3476 txrc.max_rate_idx = -1;
3478 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
3480 rate_control_get_rate(sdata, NULL, &txrc);
3482 info->control.vif = vif;
3484 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
3485 IEEE80211_TX_CTL_ASSIGN_SEQ |
3486 IEEE80211_TX_CTL_FIRST_FRAGMENT;
3494 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
3495 struct ieee80211_vif *vif,
3496 struct ieee80211_mutable_offsets *offs)
3498 return __ieee80211_beacon_get(hw, vif, offs, true);
3500 EXPORT_SYMBOL(ieee80211_beacon_get_template);
3502 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
3503 struct ieee80211_vif *vif,
3504 u16 *tim_offset, u16 *tim_length)
3506 struct ieee80211_mutable_offsets offs = {};
3507 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
3510 *tim_offset = offs.tim_offset;
3513 *tim_length = offs.tim_length;
3517 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
3519 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
3520 struct ieee80211_vif *vif)
3522 struct ieee80211_if_ap *ap = NULL;
3523 struct sk_buff *skb = NULL;
3524 struct probe_resp *presp = NULL;
3525 struct ieee80211_hdr *hdr;
3526 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3528 if (sdata->vif.type != NL80211_IFTYPE_AP)
3534 presp = rcu_dereference(ap->probe_resp);
3538 skb = dev_alloc_skb(presp->len);
3542 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
3544 hdr = (struct ieee80211_hdr *) skb->data;
3545 memset(hdr->addr1, 0, sizeof(hdr->addr1));
3551 EXPORT_SYMBOL(ieee80211_proberesp_get);
3553 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
3554 struct ieee80211_vif *vif)
3556 struct ieee80211_sub_if_data *sdata;
3557 struct ieee80211_if_managed *ifmgd;
3558 struct ieee80211_pspoll *pspoll;
3559 struct ieee80211_local *local;
3560 struct sk_buff *skb;
3562 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3565 sdata = vif_to_sdata(vif);
3566 ifmgd = &sdata->u.mgd;
3567 local = sdata->local;
3569 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
3573 skb_reserve(skb, local->hw.extra_tx_headroom);
3575 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
3576 memset(pspoll, 0, sizeof(*pspoll));
3577 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
3578 IEEE80211_STYPE_PSPOLL);
3579 pspoll->aid = cpu_to_le16(ifmgd->aid);
3581 /* aid in PS-Poll has its two MSBs each set to 1 */
3582 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
3584 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
3585 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
3589 EXPORT_SYMBOL(ieee80211_pspoll_get);
3591 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
3592 struct ieee80211_vif *vif)
3594 struct ieee80211_hdr_3addr *nullfunc;
3595 struct ieee80211_sub_if_data *sdata;
3596 struct ieee80211_if_managed *ifmgd;
3597 struct ieee80211_local *local;
3598 struct sk_buff *skb;
3600 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3603 sdata = vif_to_sdata(vif);
3604 ifmgd = &sdata->u.mgd;
3605 local = sdata->local;
3607 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
3611 skb_reserve(skb, local->hw.extra_tx_headroom);
3613 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
3615 memset(nullfunc, 0, sizeof(*nullfunc));
3616 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
3617 IEEE80211_STYPE_NULLFUNC |
3618 IEEE80211_FCTL_TODS);
3619 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
3620 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
3621 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
3625 EXPORT_SYMBOL(ieee80211_nullfunc_get);
3627 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
3629 const u8 *ssid, size_t ssid_len,
3632 struct ieee80211_local *local = hw_to_local(hw);
3633 struct ieee80211_hdr_3addr *hdr;
3634 struct sk_buff *skb;
3638 ie_ssid_len = 2 + ssid_len;
3640 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
3641 ie_ssid_len + tailroom);
3645 skb_reserve(skb, local->hw.extra_tx_headroom);
3647 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3648 memset(hdr, 0, sizeof(*hdr));
3649 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3650 IEEE80211_STYPE_PROBE_REQ);
3651 eth_broadcast_addr(hdr->addr1);
3652 memcpy(hdr->addr2, src_addr, ETH_ALEN);
3653 eth_broadcast_addr(hdr->addr3);
3655 pos = skb_put(skb, ie_ssid_len);
3656 *pos++ = WLAN_EID_SSID;
3659 memcpy(pos, ssid, ssid_len);
3664 EXPORT_SYMBOL(ieee80211_probereq_get);
3666 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3667 const void *frame, size_t frame_len,
3668 const struct ieee80211_tx_info *frame_txctl,
3669 struct ieee80211_rts *rts)
3671 const struct ieee80211_hdr *hdr = frame;
3673 rts->frame_control =
3674 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3675 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3677 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3678 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3680 EXPORT_SYMBOL(ieee80211_rts_get);
3682 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3683 const void *frame, size_t frame_len,
3684 const struct ieee80211_tx_info *frame_txctl,
3685 struct ieee80211_cts *cts)
3687 const struct ieee80211_hdr *hdr = frame;
3689 cts->frame_control =
3690 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3691 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3692 frame_len, frame_txctl);
3693 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3695 EXPORT_SYMBOL(ieee80211_ctstoself_get);
3698 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3699 struct ieee80211_vif *vif)
3701 struct ieee80211_local *local = hw_to_local(hw);
3702 struct sk_buff *skb = NULL;
3703 struct ieee80211_tx_data tx;
3704 struct ieee80211_sub_if_data *sdata;
3706 struct ieee80211_tx_info *info;
3707 struct ieee80211_chanctx_conf *chanctx_conf;
3709 sdata = vif_to_sdata(vif);
3712 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3717 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3718 struct beacon_data *beacon =
3719 rcu_dereference(sdata->u.ap.beacon);
3721 if (!beacon || !beacon->head)
3724 ps = &sdata->u.ap.ps;
3725 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3726 ps = &sdata->u.mesh.ps;
3731 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3732 goto out; /* send buffered bc/mc only after DTIM beacon */
3735 skb = skb_dequeue(&ps->bc_buf);
3738 local->total_ps_buffered--;
3740 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3741 struct ieee80211_hdr *hdr =
3742 (struct ieee80211_hdr *) skb->data;
3743 /* more buffered multicast/broadcast frames ==> set
3744 * MoreData flag in IEEE 802.11 header to inform PS
3746 hdr->frame_control |=
3747 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3750 if (sdata->vif.type == NL80211_IFTYPE_AP)
3751 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3752 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
3754 dev_kfree_skb_any(skb);
3757 info = IEEE80211_SKB_CB(skb);
3759 tx.flags |= IEEE80211_TX_PS_BUFFERED;
3760 info->band = chanctx_conf->def.chan->band;
3762 if (invoke_tx_handlers(&tx))
3769 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3771 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3773 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3774 struct ieee80211_sub_if_data *sdata = sta->sdata;
3775 struct ieee80211_local *local = sdata->local;
3779 lockdep_assert_held(&local->sta_mtx);
3781 /* only some cases are supported right now */
3782 switch (sdata->vif.type) {
3783 case NL80211_IFTYPE_STATION:
3784 case NL80211_IFTYPE_AP:
3785 case NL80211_IFTYPE_AP_VLAN:
3792 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3795 if (sta->reserved_tid == tid) {
3800 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3801 sdata_err(sdata, "TID reservation already active\n");
3806 ieee80211_stop_vif_queues(sdata->local, sdata,
3807 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3811 /* Tear down BA sessions so we stop aggregating on this TID */
3812 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
3813 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3814 __ieee80211_stop_tx_ba_session(sta, tid,
3815 AGG_STOP_LOCAL_REQUEST);
3818 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3819 __ieee80211_flush_queues(local, sdata, queues, false);
3821 sta->reserved_tid = tid;
3823 ieee80211_wake_vif_queues(local, sdata,
3824 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3826 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
3827 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3833 EXPORT_SYMBOL(ieee80211_reserve_tid);
3835 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3837 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3838 struct ieee80211_sub_if_data *sdata = sta->sdata;
3840 lockdep_assert_held(&sdata->local->sta_mtx);
3842 /* only some cases are supported right now */
3843 switch (sdata->vif.type) {
3844 case NL80211_IFTYPE_STATION:
3845 case NL80211_IFTYPE_AP:
3846 case NL80211_IFTYPE_AP_VLAN:
3853 if (tid != sta->reserved_tid) {
3854 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3858 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3860 EXPORT_SYMBOL(ieee80211_unreserve_tid);
3862 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3863 struct sk_buff *skb, int tid,
3864 enum ieee80211_band band)
3866 int ac = ieee802_1d_to_ac[tid & 7];
3868 skb_set_mac_header(skb, 0);
3869 skb_set_network_header(skb, 0);
3870 skb_set_transport_header(skb, 0);
3872 skb_set_queue_mapping(skb, ac);
3873 skb->priority = tid;
3875 skb->dev = sdata->dev;
3878 * The other path calling ieee80211_xmit is from the tasklet,
3879 * and while we can handle concurrent transmissions locking
3880 * requirements are that we do not come into tx with bhs on.
3883 IEEE80211_SKB_CB(skb)->band = band;
3884 ieee80211_xmit(sdata, NULL, skb);