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 /* TODO: add threshold stuff again */
615 switch (tx->key->conf.cipher) {
616 case WLAN_CIPHER_SUITE_WEP40:
617 case WLAN_CIPHER_SUITE_WEP104:
618 case WLAN_CIPHER_SUITE_TKIP:
619 if (!ieee80211_is_data_present(hdr->frame_control))
622 case WLAN_CIPHER_SUITE_CCMP:
623 case WLAN_CIPHER_SUITE_CCMP_256:
624 case WLAN_CIPHER_SUITE_GCMP:
625 case WLAN_CIPHER_SUITE_GCMP_256:
626 if (!ieee80211_is_data_present(hdr->frame_control) &&
627 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
631 skip_hw = (tx->key->conf.flags &
632 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
633 ieee80211_is_mgmt(hdr->frame_control);
635 case WLAN_CIPHER_SUITE_AES_CMAC:
636 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
637 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
638 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
639 if (!ieee80211_is_mgmt(hdr->frame_control))
644 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
645 !ieee80211_is_deauth(hdr->frame_control)))
648 if (!skip_hw && tx->key &&
649 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
650 info->control.hw_key = &tx->key->conf;
656 static ieee80211_tx_result debug_noinline
657 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
659 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
660 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
661 struct ieee80211_supported_band *sband;
663 struct ieee80211_tx_rate_control txrc;
664 struct ieee80211_sta_rates *ratetbl = NULL;
667 memset(&txrc, 0, sizeof(txrc));
669 sband = tx->local->hw.wiphy->bands[info->band];
671 len = min_t(u32, tx->skb->len + FCS_LEN,
672 tx->local->hw.wiphy->frag_threshold);
674 /* set up the tx rate control struct we give the RC algo */
675 txrc.hw = &tx->local->hw;
677 txrc.bss_conf = &tx->sdata->vif.bss_conf;
679 txrc.reported_rate.idx = -1;
680 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
681 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
682 txrc.max_rate_idx = -1;
684 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
686 if (tx->sdata->rc_has_mcs_mask[info->band])
687 txrc.rate_idx_mcs_mask =
688 tx->sdata->rc_rateidx_mcs_mask[info->band];
690 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
691 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
692 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
694 /* set up RTS protection if desired */
695 if (len > tx->local->hw.wiphy->rts_threshold) {
699 info->control.use_rts = txrc.rts;
700 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
703 * Use short preamble if the BSS can handle it, but not for
704 * management frames unless we know the receiver can handle
705 * that -- the management frame might be to a station that
706 * just wants a probe response.
708 if (tx->sdata->vif.bss_conf.use_short_preamble &&
709 (ieee80211_is_data(hdr->frame_control) ||
710 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
711 txrc.short_preamble = true;
713 info->control.short_preamble = txrc.short_preamble;
716 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
719 * Lets not bother rate control if we're associated and cannot
720 * talk to the sta. This should not happen.
722 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
723 !rate_usable_index_exists(sband, &tx->sta->sta),
724 "%s: Dropped data frame as no usable bitrate found while "
725 "scanning and associated. Target station: "
726 "%pM on %d GHz band\n",
727 tx->sdata->name, hdr->addr1,
732 * If we're associated with the sta at this point we know we can at
733 * least send the frame at the lowest bit rate.
735 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
737 if (tx->sta && !info->control.skip_table)
738 ratetbl = rcu_dereference(tx->sta->sta.rates);
740 if (unlikely(info->control.rates[0].idx < 0)) {
742 struct ieee80211_tx_rate rate = {
743 .idx = ratetbl->rate[0].idx,
744 .flags = ratetbl->rate[0].flags,
745 .count = ratetbl->rate[0].count
748 if (ratetbl->rate[0].idx < 0)
756 tx->rate = info->control.rates[0];
759 if (txrc.reported_rate.idx < 0) {
760 txrc.reported_rate = tx->rate;
761 if (tx->sta && ieee80211_is_data(hdr->frame_control))
762 tx->sta->last_tx_rate = txrc.reported_rate;
764 tx->sta->last_tx_rate = txrc.reported_rate;
769 if (unlikely(!info->control.rates[0].count))
770 info->control.rates[0].count = 1;
772 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
773 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
774 info->control.rates[0].count = 1;
779 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
781 u16 *seq = &sta->tid_seq[tid];
782 __le16 ret = cpu_to_le16(*seq);
784 /* Increase the sequence number. */
785 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
790 static ieee80211_tx_result debug_noinline
791 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
793 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
794 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
799 * Packet injection may want to control the sequence
800 * number, if we have no matching interface then we
801 * neither assign one ourselves nor ask the driver to.
803 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
806 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
809 if (ieee80211_hdrlen(hdr->frame_control) < 24)
812 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
816 * Anything but QoS data that has a sequence number field
817 * (is long enough) gets a sequence number from the global
818 * counter. QoS data frames with a multicast destination
819 * also use the global counter (802.11-2012 9.3.2.10).
821 if (!ieee80211_is_data_qos(hdr->frame_control) ||
822 is_multicast_ether_addr(hdr->addr1)) {
823 /* driver should assign sequence number */
824 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
825 /* for pure STA mode without beacons, we can do it */
826 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
827 tx->sdata->sequence_number += 0x10;
829 tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++;
834 * This should be true for injected/management frames only, for
835 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
836 * above since they are not QoS-data frames.
841 /* include per-STA, per-TID sequence counter */
843 qc = ieee80211_get_qos_ctl(hdr);
844 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
845 tx->sta->tx_msdu[tid]++;
847 if (!tx->sta->sta.txq[0])
848 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
853 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
854 struct sk_buff *skb, int hdrlen,
857 struct ieee80211_local *local = tx->local;
858 struct ieee80211_tx_info *info;
860 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
861 int pos = hdrlen + per_fragm;
862 int rem = skb->len - hdrlen - per_fragm;
864 if (WARN_ON(rem < 0))
867 /* first fragment was already added to queue by caller */
870 int fraglen = per_fragm;
875 tmp = dev_alloc_skb(local->tx_headroom +
877 tx->sdata->encrypt_headroom +
878 IEEE80211_ENCRYPT_TAILROOM);
882 __skb_queue_tail(&tx->skbs, tmp);
885 local->tx_headroom + tx->sdata->encrypt_headroom);
887 /* copy control information */
888 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
890 info = IEEE80211_SKB_CB(tmp);
891 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
892 IEEE80211_TX_CTL_FIRST_FRAGMENT);
895 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
897 skb_copy_queue_mapping(tmp, skb);
898 tmp->priority = skb->priority;
901 /* copy header and data */
902 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
903 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
908 /* adjust first fragment's length */
909 skb_trim(skb, hdrlen + per_fragm);
913 static ieee80211_tx_result debug_noinline
914 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
916 struct sk_buff *skb = tx->skb;
917 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
918 struct ieee80211_hdr *hdr = (void *)skb->data;
919 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
923 /* no matter what happens, tx->skb moves to tx->skbs */
924 __skb_queue_tail(&tx->skbs, skb);
927 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
930 if (tx->local->ops->set_frag_threshold)
934 * Warn when submitting a fragmented A-MPDU frame and drop it.
935 * This scenario is handled in ieee80211_tx_prepare but extra
936 * caution taken here as fragmented ampdu may cause Tx stop.
938 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
941 hdrlen = ieee80211_hdrlen(hdr->frame_control);
943 /* internal error, why isn't DONTFRAG set? */
944 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
948 * Now fragment the frame. This will allocate all the fragments and
949 * chain them (using skb as the first fragment) to skb->next.
950 * During transmission, we will remove the successfully transmitted
951 * fragments from this list. When the low-level driver rejects one
952 * of the fragments then we will simply pretend to accept the skb
953 * but store it away as pending.
955 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
958 /* update duration/seq/flags of fragments */
961 skb_queue_walk(&tx->skbs, skb) {
962 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
964 hdr = (void *)skb->data;
965 info = IEEE80211_SKB_CB(skb);
967 if (!skb_queue_is_last(&tx->skbs, skb)) {
968 hdr->frame_control |= morefrags;
970 * No multi-rate retries for fragmented frames, that
971 * would completely throw off the NAV at other STAs.
973 info->control.rates[1].idx = -1;
974 info->control.rates[2].idx = -1;
975 info->control.rates[3].idx = -1;
976 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
977 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
979 hdr->frame_control &= ~morefrags;
981 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
988 static ieee80211_tx_result debug_noinline
989 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
997 skb_queue_walk(&tx->skbs, skb) {
998 ac = skb_get_queue_mapping(skb);
999 tx->sta->tx_bytes[ac] += skb->len;
1002 tx->sta->tx_packets[ac]++;
1007 static ieee80211_tx_result debug_noinline
1008 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1013 switch (tx->key->conf.cipher) {
1014 case WLAN_CIPHER_SUITE_WEP40:
1015 case WLAN_CIPHER_SUITE_WEP104:
1016 return ieee80211_crypto_wep_encrypt(tx);
1017 case WLAN_CIPHER_SUITE_TKIP:
1018 return ieee80211_crypto_tkip_encrypt(tx);
1019 case WLAN_CIPHER_SUITE_CCMP:
1020 return ieee80211_crypto_ccmp_encrypt(
1021 tx, IEEE80211_CCMP_MIC_LEN);
1022 case WLAN_CIPHER_SUITE_CCMP_256:
1023 return ieee80211_crypto_ccmp_encrypt(
1024 tx, IEEE80211_CCMP_256_MIC_LEN);
1025 case WLAN_CIPHER_SUITE_AES_CMAC:
1026 return ieee80211_crypto_aes_cmac_encrypt(tx);
1027 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1028 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1029 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1030 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1031 return ieee80211_crypto_aes_gmac_encrypt(tx);
1032 case WLAN_CIPHER_SUITE_GCMP:
1033 case WLAN_CIPHER_SUITE_GCMP_256:
1034 return ieee80211_crypto_gcmp_encrypt(tx);
1036 return ieee80211_crypto_hw_encrypt(tx);
1042 static ieee80211_tx_result debug_noinline
1043 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1045 struct sk_buff *skb;
1046 struct ieee80211_hdr *hdr;
1050 skb_queue_walk(&tx->skbs, skb) {
1051 hdr = (void *) skb->data;
1052 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1053 break; /* must not overwrite AID */
1054 if (!skb_queue_is_last(&tx->skbs, skb)) {
1055 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1056 next_len = next->len;
1059 group_addr = is_multicast_ether_addr(hdr->addr1);
1062 ieee80211_duration(tx, skb, group_addr, next_len);
1068 /* actual transmit path */
1070 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1071 struct sk_buff *skb,
1072 struct ieee80211_tx_info *info,
1073 struct tid_ampdu_tx *tid_tx,
1076 bool queued = false;
1077 bool reset_agg_timer = false;
1078 struct sk_buff *purge_skb = NULL;
1080 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1081 info->flags |= IEEE80211_TX_CTL_AMPDU;
1082 reset_agg_timer = true;
1083 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1085 * nothing -- this aggregation session is being started
1086 * but that might still fail with the driver
1088 } else if (!tx->sta->sta.txq[tid]) {
1089 spin_lock(&tx->sta->lock);
1091 * Need to re-check now, because we may get here
1093 * 1) in the window during which the setup is actually
1094 * already done, but not marked yet because not all
1095 * packets are spliced over to the driver pending
1096 * queue yet -- if this happened we acquire the lock
1097 * either before or after the splice happens, but
1098 * need to recheck which of these cases happened.
1100 * 2) during session teardown, if the OPERATIONAL bit
1101 * was cleared due to the teardown but the pointer
1102 * hasn't been assigned NULL yet (or we loaded it
1103 * before it was assigned) -- in this case it may
1104 * now be NULL which means we should just let the
1105 * packet pass through because splicing the frames
1106 * back is already done.
1108 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1111 /* do nothing, let packet pass through */
1112 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1113 info->flags |= IEEE80211_TX_CTL_AMPDU;
1114 reset_agg_timer = true;
1117 info->control.vif = &tx->sdata->vif;
1118 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1119 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1120 __skb_queue_tail(&tid_tx->pending, skb);
1121 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1122 purge_skb = __skb_dequeue(&tid_tx->pending);
1124 spin_unlock(&tx->sta->lock);
1127 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1130 /* reset session timer */
1131 if (reset_agg_timer && tid_tx->timeout)
1132 tid_tx->last_tx = jiffies;
1139 * pass %NULL for the station if unknown, a valid pointer if known
1140 * or an ERR_PTR() if the station is known not to exist
1142 static ieee80211_tx_result
1143 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1144 struct ieee80211_tx_data *tx,
1145 struct sta_info *sta, struct sk_buff *skb)
1147 struct ieee80211_local *local = sdata->local;
1148 struct ieee80211_hdr *hdr;
1149 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1153 memset(tx, 0, sizeof(*tx));
1157 __skb_queue_head_init(&tx->skbs);
1160 * If this flag is set to true anywhere, and we get here,
1161 * we are doing the needed processing, so remove the flag
1164 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1166 hdr = (struct ieee80211_hdr *) skb->data;
1172 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1173 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1174 if (!tx->sta && sdata->wdev.use_4addr)
1176 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1177 IEEE80211_TX_CTL_INJECTED) ||
1178 tx->sdata->control_port_protocol == tx->skb->protocol) {
1179 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1181 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1182 tx->sta = sta_info_get(sdata, hdr->addr1);
1185 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1186 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1187 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1188 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1189 struct tid_ampdu_tx *tid_tx;
1191 qc = ieee80211_get_qos_ctl(hdr);
1192 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1194 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1198 queued = ieee80211_tx_prep_agg(tx, skb, info,
1201 if (unlikely(queued))
1206 if (is_multicast_ether_addr(hdr->addr1)) {
1207 tx->flags &= ~IEEE80211_TX_UNICAST;
1208 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1210 tx->flags |= IEEE80211_TX_UNICAST;
1212 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1213 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1214 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1215 info->flags & IEEE80211_TX_CTL_AMPDU)
1216 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1220 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1221 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1222 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1224 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1229 static void ieee80211_drv_tx(struct ieee80211_local *local,
1230 struct ieee80211_vif *vif,
1231 struct ieee80211_sta *pubsta,
1232 struct sk_buff *skb)
1234 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1235 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1236 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1237 struct ieee80211_tx_control control = {
1240 struct ieee80211_txq *txq = NULL;
1241 struct txq_info *txqi;
1244 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)
1247 if (!ieee80211_is_data(hdr->frame_control))
1251 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1253 txq = pubsta->txq[tid];
1262 txqi = to_txq_info(txq);
1263 atomic_inc(&sdata->txqs_len[ac]);
1264 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)
1265 netif_stop_subqueue(sdata->dev, ac);
1267 skb_queue_tail(&txqi->queue, skb);
1268 drv_wake_tx_queue(local, txqi);
1273 drv_tx(local, &control, skb);
1276 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
1277 struct ieee80211_txq *txq)
1279 struct ieee80211_local *local = hw_to_local(hw);
1280 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
1281 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
1282 struct ieee80211_hdr *hdr;
1283 struct sk_buff *skb = NULL;
1286 spin_lock_bh(&txqi->queue.lock);
1288 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
1291 skb = __skb_dequeue(&txqi->queue);
1295 atomic_dec(&sdata->txqs_len[ac]);
1296 if (__netif_subqueue_stopped(sdata->dev, ac))
1297 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);
1299 hdr = (struct ieee80211_hdr *)skb->data;
1300 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1301 struct sta_info *sta = container_of(txq->sta, struct sta_info,
1303 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1305 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
1306 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
1307 info->flags |= IEEE80211_TX_CTL_AMPDU;
1309 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1313 spin_unlock_bh(&txqi->queue.lock);
1317 EXPORT_SYMBOL(ieee80211_tx_dequeue);
1319 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1320 struct ieee80211_vif *vif,
1321 struct ieee80211_sta *sta,
1322 struct sk_buff_head *skbs,
1325 struct sk_buff *skb, *tmp;
1326 unsigned long flags;
1328 skb_queue_walk_safe(skbs, skb, tmp) {
1329 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1330 int q = info->hw_queue;
1332 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1333 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1334 __skb_unlink(skb, skbs);
1335 ieee80211_free_txskb(&local->hw, skb);
1340 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1341 if (local->queue_stop_reasons[q] ||
1342 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1343 if (unlikely(info->flags &
1344 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1345 if (local->queue_stop_reasons[q] &
1346 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1348 * Drop off-channel frames if queues
1349 * are stopped for any reason other
1350 * than off-channel operation. Never
1353 spin_unlock_irqrestore(
1354 &local->queue_stop_reason_lock,
1356 ieee80211_purge_tx_queue(&local->hw,
1363 * Since queue is stopped, queue up frames for
1364 * later transmission from the tx-pending
1365 * tasklet when the queue is woken again.
1368 skb_queue_splice_init(skbs,
1369 &local->pending[q]);
1371 skb_queue_splice_tail_init(skbs,
1372 &local->pending[q]);
1374 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1379 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1381 info->control.vif = vif;
1383 __skb_unlink(skb, skbs);
1384 ieee80211_drv_tx(local, vif, sta, skb);
1391 * Returns false if the frame couldn't be transmitted but was queued instead.
1393 static bool __ieee80211_tx(struct ieee80211_local *local,
1394 struct sk_buff_head *skbs, int led_len,
1395 struct sta_info *sta, bool txpending)
1397 struct ieee80211_tx_info *info;
1398 struct ieee80211_sub_if_data *sdata;
1399 struct ieee80211_vif *vif;
1400 struct ieee80211_sta *pubsta;
1401 struct sk_buff *skb;
1405 if (WARN_ON(skb_queue_empty(skbs)))
1408 skb = skb_peek(skbs);
1409 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1410 info = IEEE80211_SKB_CB(skb);
1411 sdata = vif_to_sdata(info->control.vif);
1412 if (sta && !sta->uploaded)
1420 switch (sdata->vif.type) {
1421 case NL80211_IFTYPE_MONITOR:
1422 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1426 sdata = rcu_dereference(local->monitor_sdata);
1430 vif->hw_queue[skb_get_queue_mapping(skb)];
1431 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1437 case NL80211_IFTYPE_AP_VLAN:
1438 sdata = container_of(sdata->bss,
1439 struct ieee80211_sub_if_data, u.ap);
1446 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1449 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1451 WARN_ON_ONCE(!skb_queue_empty(skbs));
1457 * Invoke TX handlers, return 0 on success and non-zero if the
1458 * frame was dropped or queued.
1460 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1462 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1463 ieee80211_tx_result res = TX_DROP;
1465 #define CALL_TXH(txh) \
1468 if (res != TX_CONTINUE) \
1472 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1473 CALL_TXH(ieee80211_tx_h_check_assoc);
1474 CALL_TXH(ieee80211_tx_h_ps_buf);
1475 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1476 CALL_TXH(ieee80211_tx_h_select_key);
1477 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1478 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1480 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1481 __skb_queue_tail(&tx->skbs, tx->skb);
1486 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1487 CALL_TXH(ieee80211_tx_h_sequence);
1488 CALL_TXH(ieee80211_tx_h_fragment);
1489 /* handlers after fragment must be aware of tx info fragmentation! */
1490 CALL_TXH(ieee80211_tx_h_stats);
1491 CALL_TXH(ieee80211_tx_h_encrypt);
1492 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1493 CALL_TXH(ieee80211_tx_h_calculate_duration);
1497 if (unlikely(res == TX_DROP)) {
1498 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1500 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1502 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1504 } else if (unlikely(res == TX_QUEUED)) {
1505 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1512 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1513 struct ieee80211_vif *vif, struct sk_buff *skb,
1514 int band, struct ieee80211_sta **sta)
1516 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1517 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1518 struct ieee80211_tx_data tx;
1519 struct sk_buff *skb2;
1521 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1525 info->control.vif = vif;
1526 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1528 if (invoke_tx_handlers(&tx))
1533 *sta = &tx.sta->sta;
1538 /* this function isn't suitable for fragmented data frames */
1539 skb2 = __skb_dequeue(&tx.skbs);
1540 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1541 ieee80211_free_txskb(hw, skb2);
1542 ieee80211_purge_tx_queue(hw, &tx.skbs);
1548 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1551 * Returns false if the frame couldn't be transmitted but was queued instead.
1553 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1554 struct sta_info *sta, struct sk_buff *skb,
1557 struct ieee80211_local *local = sdata->local;
1558 struct ieee80211_tx_data tx;
1559 ieee80211_tx_result res_prepare;
1560 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1564 if (unlikely(skb->len < 10)) {
1569 /* initialises tx */
1571 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1573 if (unlikely(res_prepare == TX_DROP)) {
1574 ieee80211_free_txskb(&local->hw, skb);
1576 } else if (unlikely(res_prepare == TX_QUEUED)) {
1580 /* set up hw_queue value early */
1581 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1582 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1584 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1586 if (!invoke_tx_handlers(&tx))
1587 result = __ieee80211_tx(local, &tx.skbs, led_len,
1593 /* device xmit handlers */
1595 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1596 struct sk_buff *skb,
1597 int head_need, bool may_encrypt)
1599 struct ieee80211_local *local = sdata->local;
1602 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1603 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1604 tail_need -= skb_tailroom(skb);
1605 tail_need = max_t(int, tail_need, 0);
1608 if (skb_cloned(skb) &&
1609 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1610 !skb_clone_writable(skb, ETH_HLEN) ||
1611 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1612 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1613 else if (head_need || tail_need)
1614 I802_DEBUG_INC(local->tx_expand_skb_head);
1618 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1619 wiphy_debug(local->hw.wiphy,
1620 "failed to reallocate TX buffer\n");
1627 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1628 struct sta_info *sta, struct sk_buff *skb)
1630 struct ieee80211_local *local = sdata->local;
1631 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1632 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1636 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1638 headroom = local->tx_headroom;
1640 headroom += sdata->encrypt_headroom;
1641 headroom -= skb_headroom(skb);
1642 headroom = max_t(int, 0, headroom);
1644 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1645 ieee80211_free_txskb(&local->hw, skb);
1649 hdr = (struct ieee80211_hdr *) skb->data;
1650 info->control.vif = &sdata->vif;
1652 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1653 if (ieee80211_is_data(hdr->frame_control) &&
1654 is_unicast_ether_addr(hdr->addr1)) {
1655 if (mesh_nexthop_resolve(sdata, skb))
1656 return; /* skb queued: don't free */
1658 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1662 ieee80211_set_qos_hdr(sdata, skb);
1663 ieee80211_tx(sdata, sta, skb, false);
1666 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1668 struct ieee80211_radiotap_iterator iterator;
1669 struct ieee80211_radiotap_header *rthdr =
1670 (struct ieee80211_radiotap_header *) skb->data;
1671 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1672 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1676 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1677 IEEE80211_TX_CTL_DONTFRAG;
1680 * for every radiotap entry that is present
1681 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1682 * entries present, or -EINVAL on error)
1686 ret = ieee80211_radiotap_iterator_next(&iterator);
1691 /* see if this argument is something we can use */
1692 switch (iterator.this_arg_index) {
1694 * You must take care when dereferencing iterator.this_arg
1695 * for multibyte types... the pointer is not aligned. Use
1696 * get_unaligned((type *)iterator.this_arg) to dereference
1697 * iterator.this_arg for type "type" safely on all arches.
1699 case IEEE80211_RADIOTAP_FLAGS:
1700 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1702 * this indicates that the skb we have been
1703 * handed has the 32-bit FCS CRC at the end...
1704 * we should react to that by snipping it off
1705 * because it will be recomputed and added
1708 if (skb->len < (iterator._max_length + FCS_LEN))
1711 skb_trim(skb, skb->len - FCS_LEN);
1713 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1714 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1715 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1716 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1719 case IEEE80211_RADIOTAP_TX_FLAGS:
1720 txflags = get_unaligned_le16(iterator.this_arg);
1721 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1722 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1726 * Please update the file
1727 * Documentation/networking/mac80211-injection.txt
1728 * when parsing new fields here.
1736 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1740 * remove the radiotap header
1741 * iterator->_max_length was sanity-checked against
1742 * skb->len by iterator init
1744 skb_pull(skb, iterator._max_length);
1749 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1750 struct net_device *dev)
1752 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1753 struct ieee80211_chanctx_conf *chanctx_conf;
1754 struct ieee80211_radiotap_header *prthdr =
1755 (struct ieee80211_radiotap_header *)skb->data;
1756 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1757 struct ieee80211_hdr *hdr;
1758 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1759 struct cfg80211_chan_def *chandef;
1763 /* check for not even having the fixed radiotap header part */
1764 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1765 goto fail; /* too short to be possibly valid */
1767 /* is it a header version we can trust to find length from? */
1768 if (unlikely(prthdr->it_version))
1769 goto fail; /* only version 0 is supported */
1771 /* then there must be a radiotap header with a length we can use */
1772 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1774 /* does the skb contain enough to deliver on the alleged length? */
1775 if (unlikely(skb->len < len_rthdr))
1776 goto fail; /* skb too short for claimed rt header extent */
1779 * fix up the pointers accounting for the radiotap
1780 * header still being in there. We are being given
1781 * a precooked IEEE80211 header so no need for
1784 skb_set_mac_header(skb, len_rthdr);
1786 * these are just fixed to the end of the rt area since we
1787 * don't have any better information and at this point, nobody cares
1789 skb_set_network_header(skb, len_rthdr);
1790 skb_set_transport_header(skb, len_rthdr);
1792 if (skb->len < len_rthdr + 2)
1795 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1796 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1798 if (skb->len < len_rthdr + hdrlen)
1802 * Initialize skb->protocol if the injected frame is a data frame
1803 * carrying a rfc1042 header
1805 if (ieee80211_is_data(hdr->frame_control) &&
1806 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1807 u8 *payload = (u8 *)hdr + hdrlen;
1809 if (ether_addr_equal(payload, rfc1042_header))
1810 skb->protocol = cpu_to_be16((payload[6] << 8) |
1814 memset(info, 0, sizeof(*info));
1816 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1817 IEEE80211_TX_CTL_INJECTED;
1819 /* process and remove the injection radiotap header */
1820 if (!ieee80211_parse_tx_radiotap(skb))
1826 * We process outgoing injected frames that have a local address
1827 * we handle as though they are non-injected frames.
1828 * This code here isn't entirely correct, the local MAC address
1829 * isn't always enough to find the interface to use; for proper
1830 * VLAN/WDS support we will need a different mechanism (which
1831 * likely isn't going to be monitor interfaces).
1833 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1835 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1836 if (!ieee80211_sdata_running(tmp_sdata))
1838 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1839 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1840 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1842 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1848 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1849 if (!chanctx_conf) {
1850 tmp_sdata = rcu_dereference(local->monitor_sdata);
1853 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1857 chandef = &chanctx_conf->def;
1858 else if (!local->use_chanctx)
1859 chandef = &local->_oper_chandef;
1864 * Frame injection is not allowed if beaconing is not allowed
1865 * or if we need radar detection. Beaconing is usually not allowed when
1866 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1867 * Passive scan is also used in world regulatory domains where
1868 * your country is not known and as such it should be treated as
1869 * NO TX unless the channel is explicitly allowed in which case
1870 * your current regulatory domain would not have the passive scan
1873 * Since AP mode uses monitor interfaces to inject/TX management
1874 * frames we can make AP mode the exception to this rule once it
1875 * supports radar detection as its implementation can deal with
1876 * radar detection by itself. We can do that later by adding a
1877 * monitor flag interfaces used for AP support.
1879 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1883 info->band = chandef->chan->band;
1884 ieee80211_xmit(sdata, NULL, skb);
1887 return NETDEV_TX_OK;
1893 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1896 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
1898 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
1900 return ethertype == ETH_P_TDLS &&
1902 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1905 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
1906 struct sk_buff *skb,
1907 struct sta_info **sta_out)
1909 struct sta_info *sta;
1911 switch (sdata->vif.type) {
1912 case NL80211_IFTYPE_AP_VLAN:
1913 sta = rcu_dereference(sdata->u.vlan.sta);
1917 } else if (sdata->wdev.use_4addr) {
1921 case NL80211_IFTYPE_AP:
1922 case NL80211_IFTYPE_OCB:
1923 case NL80211_IFTYPE_ADHOC:
1924 if (is_multicast_ether_addr(skb->data)) {
1925 *sta_out = ERR_PTR(-ENOENT);
1928 sta = sta_info_get_bss(sdata, skb->data);
1930 case NL80211_IFTYPE_WDS:
1931 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
1933 #ifdef CONFIG_MAC80211_MESH
1934 case NL80211_IFTYPE_MESH_POINT:
1935 /* determined much later */
1939 case NL80211_IFTYPE_STATION:
1940 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1941 sta = sta_info_get(sdata, skb->data);
1943 bool tdls_peer, tdls_auth;
1945 tdls_peer = test_sta_flag(sta,
1946 WLAN_STA_TDLS_PEER);
1947 tdls_auth = test_sta_flag(sta,
1948 WLAN_STA_TDLS_PEER_AUTH);
1950 if (tdls_peer && tdls_auth) {
1956 * TDLS link during setup - throw out frames to
1957 * peer. Allow TDLS-setup frames to unauthorized
1958 * peers for the special case of a link teardown
1959 * after a TDLS sta is removed due to being
1962 if (tdls_peer && !tdls_auth &&
1963 !ieee80211_is_tdls_setup(skb))
1969 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
1977 *sta_out = sta ?: ERR_PTR(-ENOENT);
1982 * ieee80211_build_hdr - build 802.11 header in the given frame
1983 * @sdata: virtual interface to build the header for
1984 * @skb: the skb to build the header in
1985 * @info_flags: skb flags to set
1987 * This function takes the skb with 802.3 header and reformats the header to
1988 * the appropriate IEEE 802.11 header based on which interface the packet is
1989 * being transmitted on.
1991 * Note that this function also takes care of the TX status request and
1992 * potential unsharing of the SKB - this needs to be interleaved with the
1995 * The function requires the read-side RCU lock held
1997 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1999 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2000 struct sk_buff *skb, u32 info_flags,
2001 struct sta_info *sta)
2003 struct ieee80211_local *local = sdata->local;
2004 struct ieee80211_tx_info *info;
2006 u16 ethertype, hdrlen, meshhdrlen = 0;
2008 struct ieee80211_hdr hdr;
2009 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2010 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2011 const u8 *encaps_data;
2012 int encaps_len, skip_header_bytes;
2014 bool wme_sta = false, authorized = false;
2018 struct ieee80211_chanctx_conf *chanctx_conf;
2019 struct ieee80211_sub_if_data *ap_sdata;
2020 enum ieee80211_band band;
2026 /* convert Ethernet header to proper 802.11 header (based on
2027 * operation mode) */
2028 ethertype = (skb->data[12] << 8) | skb->data[13];
2029 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2031 switch (sdata->vif.type) {
2032 case NL80211_IFTYPE_AP_VLAN:
2033 if (sdata->wdev.use_4addr) {
2034 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2036 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2037 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2038 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2039 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2041 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2042 wme_sta = sta->sta.wme;
2044 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2046 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2047 if (!chanctx_conf) {
2051 band = chanctx_conf->def.chan->band;
2052 if (sdata->wdev.use_4addr)
2055 case NL80211_IFTYPE_AP:
2056 if (sdata->vif.type == NL80211_IFTYPE_AP)
2057 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2058 if (!chanctx_conf) {
2062 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2064 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2065 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2066 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2068 band = chanctx_conf->def.chan->band;
2070 case NL80211_IFTYPE_WDS:
2071 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2073 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2074 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2075 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2076 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2079 * This is the exception! WDS style interfaces are prohibited
2080 * when channel contexts are in used so this must be valid
2082 band = local->hw.conf.chandef.chan->band;
2084 #ifdef CONFIG_MAC80211_MESH
2085 case NL80211_IFTYPE_MESH_POINT:
2086 if (!is_multicast_ether_addr(skb->data)) {
2087 struct sta_info *next_hop;
2088 bool mpp_lookup = true;
2090 mpath = mesh_path_lookup(sdata, skb->data);
2093 next_hop = rcu_dereference(mpath->next_hop);
2095 !(mpath->flags & (MESH_PATH_ACTIVE |
2096 MESH_PATH_RESOLVING)))
2101 mppath = mpp_path_lookup(sdata, skb->data);
2103 if (mppath && mpath)
2104 mesh_path_del(mpath->sdata, mpath->dst);
2108 * Use address extension if it is a packet from
2109 * another interface or if we know the destination
2110 * is being proxied by a portal (i.e. portal address
2111 * differs from proxied address)
2113 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2114 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2115 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2116 skb->data, skb->data + ETH_ALEN);
2117 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2120 /* DS -> MBSS (802.11-2012 13.11.3.3).
2121 * For unicast with unknown forwarding information,
2122 * destination might be in the MBSS or if that fails
2123 * forwarded to another mesh gate. In either case
2124 * resolution will be handled in ieee80211_xmit(), so
2125 * leave the original DA. This also works for mcast */
2126 const u8 *mesh_da = skb->data;
2129 mesh_da = mppath->mpp;
2131 mesh_da = mpath->dst;
2133 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2134 mesh_da, sdata->vif.addr);
2135 if (is_multicast_ether_addr(mesh_da))
2136 /* DA TA mSA AE:SA */
2137 meshhdrlen = ieee80211_new_mesh_header(
2139 skb->data + ETH_ALEN, NULL);
2141 /* RA TA mDA mSA AE:DA SA */
2142 meshhdrlen = ieee80211_new_mesh_header(
2143 sdata, &mesh_hdr, skb->data,
2144 skb->data + ETH_ALEN);
2147 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2148 if (!chanctx_conf) {
2152 band = chanctx_conf->def.chan->band;
2155 case NL80211_IFTYPE_STATION:
2156 /* we already did checks when looking up the RA STA */
2157 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2161 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2162 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2163 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2165 } else if (sdata->u.mgd.use_4addr &&
2166 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2167 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2168 IEEE80211_FCTL_TODS);
2170 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2171 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2172 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2173 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2176 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2178 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2179 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2180 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2183 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2184 if (!chanctx_conf) {
2188 band = chanctx_conf->def.chan->band;
2190 case NL80211_IFTYPE_OCB:
2192 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2193 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2194 eth_broadcast_addr(hdr.addr3);
2196 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2197 if (!chanctx_conf) {
2201 band = chanctx_conf->def.chan->band;
2203 case NL80211_IFTYPE_ADHOC:
2205 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2206 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2207 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2209 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2210 if (!chanctx_conf) {
2214 band = chanctx_conf->def.chan->band;
2221 multicast = is_multicast_ether_addr(hdr.addr1);
2223 /* sta is always NULL for mesh */
2225 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2226 wme_sta = sta->sta.wme;
2227 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2228 /* For mesh, the use of the QoS header is mandatory */
2232 /* receiver does QoS (which also means we do) use it */
2234 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2239 * Drop unicast frames to unauthorised stations unless they are
2240 * EAPOL frames from the local station.
2242 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2243 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2244 !multicast && !authorized &&
2245 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2246 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2247 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2248 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2249 sdata->name, hdr.addr1);
2252 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2258 if (unlikely(!multicast && skb->sk &&
2259 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2260 struct sk_buff *ack_skb = skb_clone_sk(skb);
2263 unsigned long flags;
2266 spin_lock_irqsave(&local->ack_status_lock, flags);
2267 id = idr_alloc(&local->ack_status_frames, ack_skb,
2268 1, 0x10000, GFP_ATOMIC);
2269 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2273 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2281 * If the skb is shared we need to obtain our own copy.
2283 if (skb_shared(skb)) {
2284 struct sk_buff *tmp_skb = skb;
2286 /* can't happen -- skb is a clone if info_id != 0 */
2289 skb = skb_clone(skb, GFP_ATOMIC);
2298 hdr.frame_control = fc;
2299 hdr.duration_id = 0;
2302 skip_header_bytes = ETH_HLEN;
2303 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2304 encaps_data = bridge_tunnel_header;
2305 encaps_len = sizeof(bridge_tunnel_header);
2306 skip_header_bytes -= 2;
2307 } else if (ethertype >= ETH_P_802_3_MIN) {
2308 encaps_data = rfc1042_header;
2309 encaps_len = sizeof(rfc1042_header);
2310 skip_header_bytes -= 2;
2316 nh_pos = skb_network_header(skb) - skb->data;
2317 h_pos = skb_transport_header(skb) - skb->data;
2319 skb_pull(skb, skip_header_bytes);
2320 nh_pos -= skip_header_bytes;
2321 h_pos -= skip_header_bytes;
2323 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2326 * So we need to modify the skb header and hence need a copy of
2327 * that. The head_need variable above doesn't, so far, include
2328 * the needed header space that we don't need right away. If we
2329 * can, then we don't reallocate right now but only after the
2330 * frame arrives at the master device (if it does...)
2332 * If we cannot, however, then we will reallocate to include all
2333 * the ever needed space. Also, if we need to reallocate it anyway,
2334 * make it big enough for everything we may ever need.
2337 if (head_need > 0 || skb_cloned(skb)) {
2338 head_need += sdata->encrypt_headroom;
2339 head_need += local->tx_headroom;
2340 head_need = max_t(int, 0, head_need);
2341 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2342 ieee80211_free_txskb(&local->hw, skb);
2344 return ERR_PTR(-ENOMEM);
2349 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2350 nh_pos += encaps_len;
2351 h_pos += encaps_len;
2354 #ifdef CONFIG_MAC80211_MESH
2355 if (meshhdrlen > 0) {
2356 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2357 nh_pos += meshhdrlen;
2358 h_pos += meshhdrlen;
2362 if (ieee80211_is_data_qos(fc)) {
2363 __le16 *qos_control;
2365 qos_control = (__le16 *) skb_push(skb, 2);
2366 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2368 * Maybe we could actually set some fields here, for now just
2369 * initialise to zero to indicate no special operation.
2373 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2378 /* Update skb pointers to various headers since this modified frame
2379 * is going to go through Linux networking code that may potentially
2380 * need things like pointer to IP header. */
2381 skb_set_mac_header(skb, 0);
2382 skb_set_network_header(skb, nh_pos);
2383 skb_set_transport_header(skb, h_pos);
2385 info = IEEE80211_SKB_CB(skb);
2386 memset(info, 0, sizeof(*info));
2388 info->flags = info_flags;
2389 info->ack_frame_id = info_id;
2395 return ERR_PTR(ret);
2399 * fast-xmit overview
2401 * The core idea of this fast-xmit is to remove per-packet checks by checking
2402 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2403 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2404 * much less work can be done per packet. For example, fragmentation must be
2405 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2408 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2409 * header and other data to aid packet processing in ieee80211_xmit_fast().
2411 * The most difficult part of this is that when any of these assumptions
2412 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2413 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2414 * since the per-packet code no longer checks the conditions. This is reflected
2415 * by the calls to these functions throughout the rest of the code, and must be
2416 * maintained if any of the TX path checks change.
2419 void ieee80211_check_fast_xmit(struct sta_info *sta)
2421 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2422 struct ieee80211_local *local = sta->local;
2423 struct ieee80211_sub_if_data *sdata = sta->sdata;
2424 struct ieee80211_hdr *hdr = (void *)build.hdr;
2425 struct ieee80211_chanctx_conf *chanctx_conf;
2428 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2431 /* Locking here protects both the pointer itself, and against concurrent
2432 * invocations winning data access races to, e.g., the key pointer that
2434 * Without it, the invocation of this function right after the key
2435 * pointer changes wouldn't be sufficient, as another CPU could access
2436 * the pointer, then stall, and then do the cache update after the CPU
2437 * that invalidated the key.
2438 * With the locking, such scenarios cannot happen as the check for the
2439 * key and the fast-tx assignment are done atomically, so the CPU that
2440 * modifies the key will either wait or other one will see the key
2441 * cleared/changed already.
2443 spin_lock_bh(&sta->lock);
2444 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2445 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2446 sdata->vif.type == NL80211_IFTYPE_STATION)
2449 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2452 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2453 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2454 test_sta_flag(sta, WLAN_STA_PS_DELIVER))
2457 if (sdata->noack_map)
2460 /* fast-xmit doesn't handle fragmentation at all */
2461 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2462 !local->ops->set_frag_threshold)
2466 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2467 if (!chanctx_conf) {
2471 build.band = chanctx_conf->def.chan->band;
2474 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2476 switch (sdata->vif.type) {
2477 case NL80211_IFTYPE_ADHOC:
2479 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2480 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2481 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2484 case NL80211_IFTYPE_STATION:
2485 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2487 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2488 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2489 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2494 if (sdata->u.mgd.use_4addr) {
2495 /* non-regular ethertype cannot use the fastpath */
2496 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2497 IEEE80211_FCTL_TODS);
2499 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2500 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2501 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2502 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2506 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2508 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2509 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2510 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2513 case NL80211_IFTYPE_AP_VLAN:
2514 if (sdata->wdev.use_4addr) {
2515 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2516 IEEE80211_FCTL_TODS);
2518 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2519 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2520 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2521 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2526 case NL80211_IFTYPE_AP:
2527 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2529 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2530 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2531 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2535 /* not handled on fast-xmit */
2541 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2544 /* We store the key here so there's no point in using rcu_dereference()
2545 * but that's fine because the code that changes the pointers will call
2546 * this function after doing so. For a single CPU that would be enough,
2547 * for multiple see the comment above.
2549 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2551 build.key = rcu_access_pointer(sdata->default_unicast_key);
2553 bool gen_iv, iv_spc, mmic;
2555 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2556 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2557 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2559 /* don't handle software crypto */
2560 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2563 switch (build.key->conf.cipher) {
2564 case WLAN_CIPHER_SUITE_CCMP:
2565 case WLAN_CIPHER_SUITE_CCMP_256:
2566 /* add fixed key ID */
2568 (build.hdr + build.hdr_len)[3] =
2569 0x20 | (build.key->conf.keyidx << 6);
2570 build.pn_offs = build.hdr_len;
2572 if (gen_iv || iv_spc)
2573 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2575 case WLAN_CIPHER_SUITE_GCMP:
2576 case WLAN_CIPHER_SUITE_GCMP_256:
2577 /* add fixed key ID */
2579 (build.hdr + build.hdr_len)[3] =
2580 0x20 | (build.key->conf.keyidx << 6);
2581 build.pn_offs = build.hdr_len;
2583 if (gen_iv || iv_spc)
2584 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2586 case WLAN_CIPHER_SUITE_TKIP:
2587 /* cannot handle MMIC or IV generation in xmit-fast */
2591 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2593 case WLAN_CIPHER_SUITE_WEP40:
2594 case WLAN_CIPHER_SUITE_WEP104:
2595 /* cannot handle IV generation in fast-xmit */
2599 build.hdr_len += IEEE80211_WEP_IV_LEN;
2601 case WLAN_CIPHER_SUITE_AES_CMAC:
2602 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2603 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2604 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2606 "management cipher suite 0x%x enabled for data\n",
2607 build.key->conf.cipher);
2610 /* we don't know how to generate IVs for this at all */
2611 if (WARN_ON(gen_iv))
2613 /* pure hardware keys are OK, of course */
2614 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2616 /* cipher scheme might require space allocation */
2618 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2621 build.hdr_len += build.key->conf.iv_len;
2624 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2627 hdr->frame_control = fc;
2629 memcpy(build.hdr + build.hdr_len,
2630 rfc1042_header, sizeof(rfc1042_header));
2631 build.hdr_len += sizeof(rfc1042_header);
2633 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2634 /* if the kmemdup fails, continue w/o fast_tx */
2639 /* we might have raced against another call to this function */
2640 old = rcu_dereference_protected(sta->fast_tx,
2641 lockdep_is_held(&sta->lock));
2642 rcu_assign_pointer(sta->fast_tx, fast_tx);
2644 kfree_rcu(old, rcu_head);
2645 spin_unlock_bh(&sta->lock);
2648 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2650 struct sta_info *sta;
2653 list_for_each_entry_rcu(sta, &local->sta_list, list)
2654 ieee80211_check_fast_xmit(sta);
2658 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2660 struct ieee80211_local *local = sdata->local;
2661 struct sta_info *sta;
2665 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2666 if (sdata != sta->sdata &&
2667 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
2669 ieee80211_check_fast_xmit(sta);
2675 void ieee80211_clear_fast_xmit(struct sta_info *sta)
2677 struct ieee80211_fast_tx *fast_tx;
2679 spin_lock_bh(&sta->lock);
2680 fast_tx = rcu_dereference_protected(sta->fast_tx,
2681 lockdep_is_held(&sta->lock));
2682 RCU_INIT_POINTER(sta->fast_tx, NULL);
2683 spin_unlock_bh(&sta->lock);
2686 kfree_rcu(fast_tx, rcu_head);
2689 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
2690 struct net_device *dev, struct sta_info *sta,
2691 struct ieee80211_fast_tx *fast_tx,
2692 struct sk_buff *skb)
2694 struct ieee80211_local *local = sdata->local;
2695 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2696 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
2697 int hw_headroom = sdata->local->hw.extra_tx_headroom;
2699 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2700 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
2701 struct ieee80211_tx_data tx;
2702 ieee80211_tx_result r;
2703 struct tid_ampdu_tx *tid_tx = NULL;
2704 u8 tid = IEEE80211_NUM_TIDS;
2706 /* control port protocol needs a lot of special handling */
2707 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
2710 /* only RFC 1042 SNAP */
2711 if (ethertype < ETH_P_802_3_MIN)
2714 /* don't handle TX status request here either */
2715 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
2718 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2719 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2720 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
2722 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2724 if (tid_tx->timeout)
2725 tid_tx->last_tx = jiffies;
2729 /* after this point (skb is modified) we cannot return false */
2731 if (skb_shared(skb)) {
2732 struct sk_buff *tmp_skb = skb;
2734 skb = skb_clone(skb, GFP_ATOMIC);
2741 ieee80211_tx_stats(dev, skb->len + extra_head);
2743 /* will not be crypto-handled beyond what we do here, so use false
2744 * as the may-encrypt argument for the resize to not account for
2745 * more room than we already have in 'extra_head'
2747 if (unlikely(ieee80211_skb_resize(sdata, skb,
2748 max_t(int, extra_head + hw_headroom -
2749 skb_headroom(skb), 0),
2755 memcpy(ð, skb->data, ETH_HLEN - 2);
2756 hdr = (void *)skb_push(skb, extra_head);
2757 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
2758 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
2759 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
2761 memset(info, 0, sizeof(*info));
2762 info->band = fast_tx->band;
2763 info->control.vif = &sdata->vif;
2764 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
2765 IEEE80211_TX_CTL_DONTFRAG |
2766 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
2768 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2769 *ieee80211_get_qos_ctl(hdr) = tid;
2770 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
2772 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2773 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
2774 sdata->sequence_number += 0x10;
2777 sta->tx_msdu[tid]++;
2779 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
2781 __skb_queue_head_init(&tx.skbs);
2783 tx.flags = IEEE80211_TX_UNICAST;
2787 tx.key = fast_tx->key;
2790 info->control.hw_key = &fast_tx->key->conf;
2792 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
2794 r = ieee80211_tx_h_rate_ctrl(&tx);
2798 if (r != TX_CONTINUE) {
2805 /* statistics normally done by ieee80211_tx_h_stats (but that
2806 * has to consider fragmentation, so is more complex)
2808 sta->tx_bytes[skb_get_queue_mapping(skb)] += skb->len;
2809 sta->tx_packets[skb_get_queue_mapping(skb)]++;
2811 if (fast_tx->pn_offs) {
2813 u8 *crypto_hdr = skb->data + fast_tx->pn_offs;
2815 switch (fast_tx->key->conf.cipher) {
2816 case WLAN_CIPHER_SUITE_CCMP:
2817 case WLAN_CIPHER_SUITE_CCMP_256:
2818 case WLAN_CIPHER_SUITE_GCMP:
2819 case WLAN_CIPHER_SUITE_GCMP_256:
2820 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
2822 crypto_hdr[1] = pn >> 8;
2823 crypto_hdr[4] = pn >> 16;
2824 crypto_hdr[5] = pn >> 24;
2825 crypto_hdr[6] = pn >> 32;
2826 crypto_hdr[7] = pn >> 40;
2831 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2832 sdata = container_of(sdata->bss,
2833 struct ieee80211_sub_if_data, u.ap);
2835 __skb_queue_tail(&tx.skbs, skb);
2836 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
2840 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2841 struct net_device *dev,
2844 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2845 struct sta_info *sta;
2846 struct sk_buff *next;
2848 if (unlikely(skb->len < ETH_HLEN)) {
2855 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
2858 if (!IS_ERR_OR_NULL(sta)) {
2859 struct ieee80211_fast_tx *fast_tx;
2861 fast_tx = rcu_dereference(sta->fast_tx);
2864 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
2868 if (skb_is_gso(skb)) {
2869 struct sk_buff *segs;
2871 segs = skb_gso_segment(skb, 0);
2879 /* we cannot process non-linear frames on this path */
2880 if (skb_linearize(skb)) {
2885 /* the frame could be fragmented, software-encrypted, and other
2886 * things so we cannot really handle checksum offload with it -
2887 * fix it up in software before we handle anything else.
2889 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2890 skb_set_transport_header(skb,
2891 skb_checksum_start_offset(skb));
2892 if (skb_checksum_help(skb))
2905 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2909 ieee80211_tx_stats(dev, skb->len);
2911 ieee80211_xmit(sdata, sta, skb);
2921 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2922 * @skb: packet to be sent
2923 * @dev: incoming interface
2925 * On failure skb will be freed.
2927 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
2928 struct net_device *dev)
2930 __ieee80211_subif_start_xmit(skb, dev, 0);
2931 return NETDEV_TX_OK;
2935 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
2936 struct sk_buff *skb, u32 info_flags)
2938 struct ieee80211_hdr *hdr;
2939 struct ieee80211_tx_data tx = {
2940 .local = sdata->local,
2943 struct sta_info *sta;
2947 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
2949 skb = ERR_PTR(-EINVAL);
2953 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2957 hdr = (void *)skb->data;
2958 tx.sta = sta_info_get(sdata, hdr->addr1);
2961 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
2964 return ERR_PTR(-EINVAL);
2973 * ieee80211_clear_tx_pending may not be called in a context where
2974 * it is possible that it packets could come in again.
2976 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2978 struct sk_buff *skb;
2981 for (i = 0; i < local->hw.queues; i++) {
2982 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2983 ieee80211_free_txskb(&local->hw, skb);
2988 * Returns false if the frame couldn't be transmitted but was queued instead,
2989 * which in this case means re-queued -- take as an indication to stop sending
2990 * more pending frames.
2992 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2993 struct sk_buff *skb)
2995 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2996 struct ieee80211_sub_if_data *sdata;
2997 struct sta_info *sta;
2998 struct ieee80211_hdr *hdr;
3000 struct ieee80211_chanctx_conf *chanctx_conf;
3002 sdata = vif_to_sdata(info->control.vif);
3004 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3005 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3006 if (unlikely(!chanctx_conf)) {
3010 info->band = chanctx_conf->def.chan->band;
3011 result = ieee80211_tx(sdata, NULL, skb, true);
3013 struct sk_buff_head skbs;
3015 __skb_queue_head_init(&skbs);
3016 __skb_queue_tail(&skbs, skb);
3018 hdr = (struct ieee80211_hdr *)skb->data;
3019 sta = sta_info_get(sdata, hdr->addr1);
3021 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3028 * Transmit all pending packets. Called from tasklet.
3030 void ieee80211_tx_pending(unsigned long data)
3032 struct ieee80211_local *local = (struct ieee80211_local *)data;
3033 unsigned long flags;
3039 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3040 for (i = 0; i < local->hw.queues; i++) {
3042 * If queue is stopped by something other than due to pending
3043 * frames, or we have no pending frames, proceed to next queue.
3045 if (local->queue_stop_reasons[i] ||
3046 skb_queue_empty(&local->pending[i]))
3049 while (!skb_queue_empty(&local->pending[i])) {
3050 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3051 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3053 if (WARN_ON(!info->control.vif)) {
3054 ieee80211_free_txskb(&local->hw, skb);
3058 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3061 txok = ieee80211_tx_pending_skb(local, skb);
3062 spin_lock_irqsave(&local->queue_stop_reason_lock,
3068 if (skb_queue_empty(&local->pending[i]))
3069 ieee80211_propagate_queue_wake(local, i);
3071 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3076 /* functions for drivers to get certain frames */
3078 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3079 struct ps_data *ps, struct sk_buff *skb,
3084 int i, have_bits = 0, n1, n2;
3086 /* Generate bitmap for TIM only if there are any STAs in power save
3088 if (atomic_read(&ps->num_sta_ps) > 0)
3089 /* in the hope that this is faster than
3090 * checking byte-for-byte */
3091 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3092 IEEE80211_MAX_AID+1);
3094 if (ps->dtim_count == 0)
3095 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3100 tim = pos = (u8 *) skb_put(skb, 6);
3101 *pos++ = WLAN_EID_TIM;
3103 *pos++ = ps->dtim_count;
3104 *pos++ = sdata->vif.bss_conf.dtim_period;
3106 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3109 ps->dtim_bc_mc = aid0 == 1;
3112 /* Find largest even number N1 so that bits numbered 1 through
3113 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3114 * (N2 + 1) x 8 through 2007 are 0. */
3116 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3123 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3130 /* Bitmap control */
3132 /* Part Virt Bitmap */
3133 skb_put(skb, n2 - n1);
3134 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3136 tim[1] = n2 - n1 + 4;
3138 *pos++ = aid0; /* Bitmap control */
3139 *pos++ = 0; /* Part Virt Bitmap */
3143 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3144 struct ps_data *ps, struct sk_buff *skb,
3147 struct ieee80211_local *local = sdata->local;
3150 * Not very nice, but we want to allow the driver to call
3151 * ieee80211_beacon_get() as a response to the set_tim()
3152 * callback. That, however, is already invoked under the
3153 * sta_lock to guarantee consistent and race-free update
3154 * of the tim bitmap in mac80211 and the driver.
3156 if (local->tim_in_locked_section) {
3157 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3159 spin_lock_bh(&local->tim_lock);
3160 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3161 spin_unlock_bh(&local->tim_lock);
3167 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3168 struct beacon_data *beacon)
3170 struct probe_resp *resp;
3172 size_t beacon_data_len;
3174 u8 count = beacon->csa_current_counter;
3176 switch (sdata->vif.type) {
3177 case NL80211_IFTYPE_AP:
3178 beacon_data = beacon->tail;
3179 beacon_data_len = beacon->tail_len;
3181 case NL80211_IFTYPE_ADHOC:
3182 beacon_data = beacon->head;
3183 beacon_data_len = beacon->head_len;
3185 case NL80211_IFTYPE_MESH_POINT:
3186 beacon_data = beacon->head;
3187 beacon_data_len = beacon->head_len;
3194 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3195 resp = rcu_dereference(sdata->u.ap.probe_resp);
3197 if (beacon->csa_counter_offsets[i]) {
3198 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3204 beacon_data[beacon->csa_counter_offsets[i]] = count;
3207 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3208 resp->data[resp->csa_counter_offsets[i]] = count;
3213 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3215 beacon->csa_current_counter--;
3217 /* the counter should never reach 0 */
3218 WARN_ON_ONCE(!beacon->csa_current_counter);
3220 return beacon->csa_current_counter;
3223 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3225 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3226 struct beacon_data *beacon = NULL;
3231 if (sdata->vif.type == NL80211_IFTYPE_AP)
3232 beacon = rcu_dereference(sdata->u.ap.beacon);
3233 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3234 beacon = rcu_dereference(sdata->u.ibss.presp);
3235 else if (ieee80211_vif_is_mesh(&sdata->vif))
3236 beacon = rcu_dereference(sdata->u.mesh.beacon);
3241 count = __ieee80211_csa_update_counter(beacon);
3247 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3249 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3251 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3252 struct beacon_data *beacon = NULL;
3254 size_t beacon_data_len;
3257 if (!ieee80211_sdata_running(sdata))
3261 if (vif->type == NL80211_IFTYPE_AP) {
3262 struct ieee80211_if_ap *ap = &sdata->u.ap;
3264 beacon = rcu_dereference(ap->beacon);
3265 if (WARN_ON(!beacon || !beacon->tail))
3267 beacon_data = beacon->tail;
3268 beacon_data_len = beacon->tail_len;
3269 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3270 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3272 beacon = rcu_dereference(ifibss->presp);
3276 beacon_data = beacon->head;
3277 beacon_data_len = beacon->head_len;
3278 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3279 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3281 beacon = rcu_dereference(ifmsh->beacon);
3285 beacon_data = beacon->head;
3286 beacon_data_len = beacon->head_len;
3292 if (!beacon->csa_counter_offsets[0])
3295 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3298 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3305 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3307 static struct sk_buff *
3308 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3309 struct ieee80211_vif *vif,
3310 struct ieee80211_mutable_offsets *offs,
3313 struct ieee80211_local *local = hw_to_local(hw);
3314 struct beacon_data *beacon = NULL;
3315 struct sk_buff *skb = NULL;
3316 struct ieee80211_tx_info *info;
3317 struct ieee80211_sub_if_data *sdata = NULL;
3318 enum ieee80211_band band;
3319 struct ieee80211_tx_rate_control txrc;
3320 struct ieee80211_chanctx_conf *chanctx_conf;
3321 int csa_off_base = 0;
3325 sdata = vif_to_sdata(vif);
3326 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3328 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3332 memset(offs, 0, sizeof(*offs));
3334 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3335 struct ieee80211_if_ap *ap = &sdata->u.ap;
3337 beacon = rcu_dereference(ap->beacon);
3339 if (beacon->csa_counter_offsets[0]) {
3341 __ieee80211_csa_update_counter(beacon);
3343 ieee80211_set_csa(sdata, beacon);
3347 * headroom, head length,
3348 * tail length and maximum TIM length
3350 skb = dev_alloc_skb(local->tx_headroom +
3352 beacon->tail_len + 256 +
3353 local->hw.extra_beacon_tailroom);
3357 skb_reserve(skb, local->tx_headroom);
3358 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3361 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3365 offs->tim_offset = beacon->head_len;
3366 offs->tim_length = skb->len - beacon->head_len;
3368 /* for AP the csa offsets are from tail */
3369 csa_off_base = skb->len;
3373 memcpy(skb_put(skb, beacon->tail_len),
3374 beacon->tail, beacon->tail_len);
3377 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
3378 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3379 struct ieee80211_hdr *hdr;
3381 beacon = rcu_dereference(ifibss->presp);
3385 if (beacon->csa_counter_offsets[0]) {
3387 __ieee80211_csa_update_counter(beacon);
3389 ieee80211_set_csa(sdata, beacon);
3392 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
3393 local->hw.extra_beacon_tailroom);
3396 skb_reserve(skb, local->tx_headroom);
3397 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3400 hdr = (struct ieee80211_hdr *) skb->data;
3401 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3402 IEEE80211_STYPE_BEACON);
3403 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3404 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3406 beacon = rcu_dereference(ifmsh->beacon);
3410 if (beacon->csa_counter_offsets[0]) {
3412 /* TODO: For mesh csa_counter is in TU, so
3413 * decrementing it by one isn't correct, but
3414 * for now we leave it consistent with overall
3415 * mac80211's behavior.
3417 __ieee80211_csa_update_counter(beacon);
3419 ieee80211_set_csa(sdata, beacon);
3422 if (ifmsh->sync_ops)
3423 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
3425 skb = dev_alloc_skb(local->tx_headroom +
3429 local->hw.extra_beacon_tailroom);
3432 skb_reserve(skb, local->tx_headroom);
3433 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3435 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
3438 offs->tim_offset = beacon->head_len;
3439 offs->tim_length = skb->len - beacon->head_len;
3442 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
3450 if (offs && beacon) {
3453 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
3454 u16 csa_off = beacon->csa_counter_offsets[i];
3459 offs->csa_counter_offs[i] = csa_off_base + csa_off;
3463 band = chanctx_conf->def.chan->band;
3465 info = IEEE80211_SKB_CB(skb);
3467 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
3468 info->flags |= IEEE80211_TX_CTL_NO_ACK;
3471 memset(&txrc, 0, sizeof(txrc));
3473 txrc.sband = local->hw.wiphy->bands[band];
3474 txrc.bss_conf = &sdata->vif.bss_conf;
3476 txrc.reported_rate.idx = -1;
3477 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
3478 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
3479 txrc.max_rate_idx = -1;
3481 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
3483 rate_control_get_rate(sdata, NULL, &txrc);
3485 info->control.vif = vif;
3487 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
3488 IEEE80211_TX_CTL_ASSIGN_SEQ |
3489 IEEE80211_TX_CTL_FIRST_FRAGMENT;
3497 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
3498 struct ieee80211_vif *vif,
3499 struct ieee80211_mutable_offsets *offs)
3501 return __ieee80211_beacon_get(hw, vif, offs, true);
3503 EXPORT_SYMBOL(ieee80211_beacon_get_template);
3505 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
3506 struct ieee80211_vif *vif,
3507 u16 *tim_offset, u16 *tim_length)
3509 struct ieee80211_mutable_offsets offs = {};
3510 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
3513 *tim_offset = offs.tim_offset;
3516 *tim_length = offs.tim_length;
3520 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
3522 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
3523 struct ieee80211_vif *vif)
3525 struct ieee80211_if_ap *ap = NULL;
3526 struct sk_buff *skb = NULL;
3527 struct probe_resp *presp = NULL;
3528 struct ieee80211_hdr *hdr;
3529 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3531 if (sdata->vif.type != NL80211_IFTYPE_AP)
3537 presp = rcu_dereference(ap->probe_resp);
3541 skb = dev_alloc_skb(presp->len);
3545 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
3547 hdr = (struct ieee80211_hdr *) skb->data;
3548 memset(hdr->addr1, 0, sizeof(hdr->addr1));
3554 EXPORT_SYMBOL(ieee80211_proberesp_get);
3556 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
3557 struct ieee80211_vif *vif)
3559 struct ieee80211_sub_if_data *sdata;
3560 struct ieee80211_if_managed *ifmgd;
3561 struct ieee80211_pspoll *pspoll;
3562 struct ieee80211_local *local;
3563 struct sk_buff *skb;
3565 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3568 sdata = vif_to_sdata(vif);
3569 ifmgd = &sdata->u.mgd;
3570 local = sdata->local;
3572 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
3576 skb_reserve(skb, local->hw.extra_tx_headroom);
3578 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
3579 memset(pspoll, 0, sizeof(*pspoll));
3580 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
3581 IEEE80211_STYPE_PSPOLL);
3582 pspoll->aid = cpu_to_le16(ifmgd->aid);
3584 /* aid in PS-Poll has its two MSBs each set to 1 */
3585 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
3587 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
3588 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
3592 EXPORT_SYMBOL(ieee80211_pspoll_get);
3594 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
3595 struct ieee80211_vif *vif)
3597 struct ieee80211_hdr_3addr *nullfunc;
3598 struct ieee80211_sub_if_data *sdata;
3599 struct ieee80211_if_managed *ifmgd;
3600 struct ieee80211_local *local;
3601 struct sk_buff *skb;
3603 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3606 sdata = vif_to_sdata(vif);
3607 ifmgd = &sdata->u.mgd;
3608 local = sdata->local;
3610 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
3614 skb_reserve(skb, local->hw.extra_tx_headroom);
3616 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
3618 memset(nullfunc, 0, sizeof(*nullfunc));
3619 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
3620 IEEE80211_STYPE_NULLFUNC |
3621 IEEE80211_FCTL_TODS);
3622 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
3623 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
3624 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
3628 EXPORT_SYMBOL(ieee80211_nullfunc_get);
3630 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
3632 const u8 *ssid, size_t ssid_len,
3635 struct ieee80211_local *local = hw_to_local(hw);
3636 struct ieee80211_hdr_3addr *hdr;
3637 struct sk_buff *skb;
3641 ie_ssid_len = 2 + ssid_len;
3643 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
3644 ie_ssid_len + tailroom);
3648 skb_reserve(skb, local->hw.extra_tx_headroom);
3650 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3651 memset(hdr, 0, sizeof(*hdr));
3652 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3653 IEEE80211_STYPE_PROBE_REQ);
3654 eth_broadcast_addr(hdr->addr1);
3655 memcpy(hdr->addr2, src_addr, ETH_ALEN);
3656 eth_broadcast_addr(hdr->addr3);
3658 pos = skb_put(skb, ie_ssid_len);
3659 *pos++ = WLAN_EID_SSID;
3662 memcpy(pos, ssid, ssid_len);
3667 EXPORT_SYMBOL(ieee80211_probereq_get);
3669 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3670 const void *frame, size_t frame_len,
3671 const struct ieee80211_tx_info *frame_txctl,
3672 struct ieee80211_rts *rts)
3674 const struct ieee80211_hdr *hdr = frame;
3676 rts->frame_control =
3677 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3678 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3680 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3681 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3683 EXPORT_SYMBOL(ieee80211_rts_get);
3685 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3686 const void *frame, size_t frame_len,
3687 const struct ieee80211_tx_info *frame_txctl,
3688 struct ieee80211_cts *cts)
3690 const struct ieee80211_hdr *hdr = frame;
3692 cts->frame_control =
3693 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3694 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3695 frame_len, frame_txctl);
3696 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3698 EXPORT_SYMBOL(ieee80211_ctstoself_get);
3701 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3702 struct ieee80211_vif *vif)
3704 struct ieee80211_local *local = hw_to_local(hw);
3705 struct sk_buff *skb = NULL;
3706 struct ieee80211_tx_data tx;
3707 struct ieee80211_sub_if_data *sdata;
3709 struct ieee80211_tx_info *info;
3710 struct ieee80211_chanctx_conf *chanctx_conf;
3712 sdata = vif_to_sdata(vif);
3715 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3720 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3721 struct beacon_data *beacon =
3722 rcu_dereference(sdata->u.ap.beacon);
3724 if (!beacon || !beacon->head)
3727 ps = &sdata->u.ap.ps;
3728 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3729 ps = &sdata->u.mesh.ps;
3734 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3735 goto out; /* send buffered bc/mc only after DTIM beacon */
3738 skb = skb_dequeue(&ps->bc_buf);
3741 local->total_ps_buffered--;
3743 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3744 struct ieee80211_hdr *hdr =
3745 (struct ieee80211_hdr *) skb->data;
3746 /* more buffered multicast/broadcast frames ==> set
3747 * MoreData flag in IEEE 802.11 header to inform PS
3749 hdr->frame_control |=
3750 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3753 if (sdata->vif.type == NL80211_IFTYPE_AP)
3754 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3755 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
3757 dev_kfree_skb_any(skb);
3760 info = IEEE80211_SKB_CB(skb);
3762 tx.flags |= IEEE80211_TX_PS_BUFFERED;
3763 info->band = chanctx_conf->def.chan->band;
3765 if (invoke_tx_handlers(&tx))
3772 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3774 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3776 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3777 struct ieee80211_sub_if_data *sdata = sta->sdata;
3778 struct ieee80211_local *local = sdata->local;
3782 lockdep_assert_held(&local->sta_mtx);
3784 /* only some cases are supported right now */
3785 switch (sdata->vif.type) {
3786 case NL80211_IFTYPE_STATION:
3787 case NL80211_IFTYPE_AP:
3788 case NL80211_IFTYPE_AP_VLAN:
3795 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3798 if (sta->reserved_tid == tid) {
3803 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3804 sdata_err(sdata, "TID reservation already active\n");
3809 ieee80211_stop_vif_queues(sdata->local, sdata,
3810 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3814 /* Tear down BA sessions so we stop aggregating on this TID */
3815 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
3816 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3817 __ieee80211_stop_tx_ba_session(sta, tid,
3818 AGG_STOP_LOCAL_REQUEST);
3821 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3822 __ieee80211_flush_queues(local, sdata, queues, false);
3824 sta->reserved_tid = tid;
3826 ieee80211_wake_vif_queues(local, sdata,
3827 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3829 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
3830 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3836 EXPORT_SYMBOL(ieee80211_reserve_tid);
3838 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3840 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3841 struct ieee80211_sub_if_data *sdata = sta->sdata;
3843 lockdep_assert_held(&sdata->local->sta_mtx);
3845 /* only some cases are supported right now */
3846 switch (sdata->vif.type) {
3847 case NL80211_IFTYPE_STATION:
3848 case NL80211_IFTYPE_AP:
3849 case NL80211_IFTYPE_AP_VLAN:
3856 if (tid != sta->reserved_tid) {
3857 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3861 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3863 EXPORT_SYMBOL(ieee80211_unreserve_tid);
3865 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3866 struct sk_buff *skb, int tid,
3867 enum ieee80211_band band)
3869 int ac = ieee802_1d_to_ac[tid & 7];
3871 skb_set_mac_header(skb, 0);
3872 skb_set_network_header(skb, 0);
3873 skb_set_transport_header(skb, 0);
3875 skb_set_queue_mapping(skb, ac);
3876 skb->priority = tid;
3878 skb->dev = sdata->dev;
3881 * The other path calling ieee80211_xmit is from the tasklet,
3882 * and while we can handle concurrent transmissions locking
3883 * requirements are that we do not come into tx with bhs on.
3886 IEEE80211_SKB_CB(skb)->band = band;
3887 ieee80211_xmit(sdata, NULL, skb);