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 <net/codel.h>
28 #include <net/codel_impl.h>
29 #include <asm/unaligned.h>
30 #include <net/fq_impl.h>
32 #include "ieee80211_i.h"
33 #include "driver-ops.h"
43 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
45 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
47 u64_stats_update_begin(&tstats->syncp);
49 tstats->tx_bytes += len;
50 u64_stats_update_end(&tstats->syncp);
53 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
54 struct sk_buff *skb, int group_addr,
57 int rate, mrate, erp, dur, i, shift = 0;
58 struct ieee80211_rate *txrate;
59 struct ieee80211_local *local = tx->local;
60 struct ieee80211_supported_band *sband;
61 struct ieee80211_hdr *hdr;
62 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
63 struct ieee80211_chanctx_conf *chanctx_conf;
67 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
69 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
70 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
74 /* assume HW handles this */
75 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
79 if (WARN_ON_ONCE(tx->rate.idx < 0))
82 sband = local->hw.wiphy->bands[info->band];
83 txrate = &sband->bitrates[tx->rate.idx];
85 erp = txrate->flags & IEEE80211_RATE_ERP_G;
88 * data and mgmt (except PS Poll):
90 * - during contention period:
91 * if addr1 is group address: 0
92 * if more fragments = 0 and addr1 is individual address: time to
93 * transmit one ACK plus SIFS
94 * if more fragments = 1 and addr1 is individual address: time to
95 * transmit next fragment plus 2 x ACK plus 3 x SIFS
98 * - control response frame (CTS or ACK) shall be transmitted using the
99 * same rate as the immediately previous frame in the frame exchange
100 * sequence, if this rate belongs to the PHY mandatory rates, or else
101 * at the highest possible rate belonging to the PHY rates in the
104 hdr = (struct ieee80211_hdr *)skb->data;
105 if (ieee80211_is_ctl(hdr->frame_control)) {
106 /* TODO: These control frames are not currently sent by
107 * mac80211, but should they be implemented, this function
108 * needs to be updated to support duration field calculation.
110 * RTS: time needed to transmit pending data/mgmt frame plus
111 * one CTS frame plus one ACK frame plus 3 x SIFS
112 * CTS: duration of immediately previous RTS minus time
113 * required to transmit CTS and its SIFS
114 * ACK: 0 if immediately previous directed data/mgmt had
115 * more=0, with more=1 duration in ACK frame is duration
116 * from previous frame minus time needed to transmit ACK
118 * PS Poll: BIT(15) | BIT(14) | aid
124 if (0 /* FIX: data/mgmt during CFP */)
125 return cpu_to_le16(32768);
127 if (group_addr) /* Group address as the destination - no ACK */
130 /* Individual destination address:
131 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
132 * CTS and ACK frames shall be transmitted using the highest rate in
133 * basic rate set that is less than or equal to the rate of the
134 * immediately previous frame and that is using the same modulation
135 * (CCK or OFDM). If no basic rate set matches with these requirements,
136 * the highest mandatory rate of the PHY that is less than or equal to
137 * the rate of the previous frame is used.
138 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
141 /* use lowest available if everything fails */
142 mrate = sband->bitrates[0].bitrate;
143 for (i = 0; i < sband->n_bitrates; i++) {
144 struct ieee80211_rate *r = &sband->bitrates[i];
146 if (r->bitrate > txrate->bitrate)
149 if ((rate_flags & r->flags) != rate_flags)
152 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
153 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
155 switch (sband->band) {
156 case NL80211_BAND_2GHZ: {
158 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
159 flag = IEEE80211_RATE_MANDATORY_G;
161 flag = IEEE80211_RATE_MANDATORY_B;
166 case NL80211_BAND_5GHZ:
167 if (r->flags & IEEE80211_RATE_MANDATORY_A)
170 case NL80211_BAND_60GHZ:
171 /* TODO, for now fall through */
172 case NUM_NL80211_BANDS:
178 /* No matching basic rate found; use highest suitable mandatory
180 rate = DIV_ROUND_UP(mrate, 1 << shift);
183 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
184 if (ieee80211_is_data_qos(hdr->frame_control) &&
185 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
188 /* Time needed to transmit ACK
189 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
190 * to closest integer */
191 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
192 tx->sdata->vif.bss_conf.use_short_preamble,
196 /* Frame is fragmented: duration increases with time needed to
197 * transmit next fragment plus ACK and 2 x SIFS. */
198 dur *= 2; /* ACK + SIFS */
200 dur += ieee80211_frame_duration(sband->band, next_frag_len,
201 txrate->bitrate, erp,
202 tx->sdata->vif.bss_conf.use_short_preamble,
206 return cpu_to_le16(dur);
210 static ieee80211_tx_result debug_noinline
211 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
213 struct ieee80211_local *local = tx->local;
214 struct ieee80211_if_managed *ifmgd;
216 /* driver doesn't support power save */
217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
220 /* hardware does dynamic power save */
221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
224 /* dynamic power save disabled */
225 if (local->hw.conf.dynamic_ps_timeout <= 0)
228 /* we are scanning, don't enable power save */
232 if (!local->ps_sdata)
235 /* No point if we're going to suspend */
236 if (local->quiescing)
239 /* dynamic ps is supported only in managed mode */
240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
243 ifmgd = &tx->sdata->u.mgd;
246 * Don't wakeup from power save if u-apsd is enabled, voip ac has
247 * u-apsd enabled and the frame is in voip class. This effectively
248 * means that even if all access categories have u-apsd enabled, in
249 * practise u-apsd is only used with the voip ac. This is a
250 * workaround for the case when received voip class packets do not
251 * have correct qos tag for some reason, due the network or the
254 * Note: ifmgd->uapsd_queues access is racy here. If the value is
255 * changed via debugfs, user needs to reassociate manually to have
256 * everything in sync.
258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
263 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
264 ieee80211_stop_queues_by_reason(&local->hw,
265 IEEE80211_MAX_QUEUE_MAP,
266 IEEE80211_QUEUE_STOP_REASON_PS,
268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
269 ieee80211_queue_work(&local->hw,
270 &local->dynamic_ps_disable_work);
273 /* Don't restart the timer if we're not disassociated */
274 if (!ifmgd->associated)
277 mod_timer(&local->dynamic_ps_timer, jiffies +
278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
283 static ieee80211_tx_result debug_noinline
284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
296 !ieee80211_is_probe_req(hdr->frame_control) &&
297 !ieee80211_is_nullfunc(hdr->frame_control))
299 * When software scanning only nullfunc frames (to notify
300 * the sleep state to the AP) and probe requests (for the
301 * active scan) are allowed, all other frames should not be
302 * sent and we should not get here, but if we do
303 * nonetheless, drop them to avoid sending them
304 * off-channel. See the link below and
305 * ieee80211_start_scan() for more.
307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
314 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
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(ieee80211_is_data(hdr->frame_control) &&
335 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
337 * No associated STAs - no need to send multicast
346 /* This function is called whenever the AP is about to exceed the maximum limit
347 * of buffered frames for power saving STAs. This situation should not really
348 * happen often during normal operation, so dropping the oldest buffered packet
349 * from each queue should be OK to make some room for new frames. */
350 static void purge_old_ps_buffers(struct ieee80211_local *local)
352 int total = 0, purged = 0;
354 struct ieee80211_sub_if_data *sdata;
355 struct sta_info *sta;
357 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
360 if (sdata->vif.type == NL80211_IFTYPE_AP)
361 ps = &sdata->u.ap.ps;
362 else if (ieee80211_vif_is_mesh(&sdata->vif))
363 ps = &sdata->u.mesh.ps;
367 skb = skb_dequeue(&ps->bc_buf);
370 ieee80211_free_txskb(&local->hw, skb);
372 total += skb_queue_len(&ps->bc_buf);
376 * Drop one frame from each station from the lowest-priority
377 * AC that has frames at all.
379 list_for_each_entry_rcu(sta, &local->sta_list, list) {
382 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
383 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
384 total += skb_queue_len(&sta->ps_tx_buf[ac]);
387 ieee80211_free_txskb(&local->hw, skb);
393 local->total_ps_buffered = total;
394 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
397 static ieee80211_tx_result
398 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
400 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
401 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
405 * broadcast/multicast frame
407 * If any of the associated/peer stations is in power save mode,
408 * the frame is buffered to be sent after DTIM beacon frame.
409 * This is done either by the hardware or us.
412 /* powersaving STAs currently only in AP/VLAN/mesh mode */
413 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
414 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
418 ps = &tx->sdata->bss->ps;
419 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
420 ps = &tx->sdata->u.mesh.ps;
426 /* no buffering for ordered frames */
427 if (ieee80211_has_order(hdr->frame_control))
430 if (ieee80211_is_probe_req(hdr->frame_control))
433 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
434 info->hw_queue = tx->sdata->vif.cab_queue;
436 /* no stations in PS mode */
437 if (!atomic_read(&ps->num_sta_ps))
440 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
442 /* device releases frame after DTIM beacon */
443 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
446 /* buffered in mac80211 */
447 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
448 purge_old_ps_buffers(tx->local);
450 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
452 "BC TX buffer full - dropping the oldest frame\n");
453 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
455 tx->local->total_ps_buffered++;
457 skb_queue_tail(&ps->bc_buf, tx->skb);
462 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
465 if (!ieee80211_is_mgmt(fc))
468 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
471 if (!ieee80211_is_robust_mgmt_frame(skb))
477 static ieee80211_tx_result
478 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
480 struct sta_info *sta = tx->sta;
481 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
482 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
483 struct ieee80211_local *local = tx->local;
488 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
489 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
490 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
491 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
492 int ac = skb_get_queue_mapping(tx->skb);
494 if (ieee80211_is_mgmt(hdr->frame_control) &&
495 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
496 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
500 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
501 sta->sta.addr, sta->sta.aid, ac);
502 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
503 purge_old_ps_buffers(tx->local);
505 /* sync with ieee80211_sta_ps_deliver_wakeup */
506 spin_lock(&sta->ps_lock);
508 * STA woke up the meantime and all the frames on ps_tx_buf have
509 * been queued to pending queue. No reordering can happen, go
510 * ahead and Tx the packet.
512 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
513 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
514 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
515 spin_unlock(&sta->ps_lock);
519 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
520 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
522 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
524 ieee80211_free_txskb(&local->hw, old);
526 tx->local->total_ps_buffered++;
528 info->control.jiffies = jiffies;
529 info->control.vif = &tx->sdata->vif;
530 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
531 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
532 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
533 spin_unlock(&sta->ps_lock);
535 if (!timer_pending(&local->sta_cleanup))
536 mod_timer(&local->sta_cleanup,
537 round_jiffies(jiffies +
538 STA_INFO_CLEANUP_INTERVAL));
541 * We queued up some frames, so the TIM bit might
542 * need to be set, recalculate it.
544 sta_info_recalc_tim(sta);
547 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
549 "STA %pM in PS mode, but polling/in SP -> send frame\n",
556 static ieee80211_tx_result debug_noinline
557 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
559 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
562 if (tx->flags & IEEE80211_TX_UNICAST)
563 return ieee80211_tx_h_unicast_ps_buf(tx);
565 return ieee80211_tx_h_multicast_ps_buf(tx);
568 static ieee80211_tx_result debug_noinline
569 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
571 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
573 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
574 if (tx->sdata->control_port_no_encrypt)
575 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
576 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
577 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
583 static ieee80211_tx_result debug_noinline
584 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
586 struct ieee80211_key *key;
587 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
588 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
590 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
593 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
595 else if (ieee80211_is_group_privacy_action(tx->skb) &&
596 (key = rcu_dereference(tx->sdata->default_multicast_key)))
598 else if (ieee80211_is_mgmt(hdr->frame_control) &&
599 is_multicast_ether_addr(hdr->addr1) &&
600 ieee80211_is_robust_mgmt_frame(tx->skb) &&
601 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
603 else if (is_multicast_ether_addr(hdr->addr1) &&
604 (key = rcu_dereference(tx->sdata->default_multicast_key)))
606 else if (!is_multicast_ether_addr(hdr->addr1) &&
607 (key = rcu_dereference(tx->sdata->default_unicast_key)))
613 bool skip_hw = false;
615 /* TODO: add threshold stuff again */
617 switch (tx->key->conf.cipher) {
618 case WLAN_CIPHER_SUITE_WEP40:
619 case WLAN_CIPHER_SUITE_WEP104:
620 case WLAN_CIPHER_SUITE_TKIP:
621 if (!ieee80211_is_data_present(hdr->frame_control))
624 case WLAN_CIPHER_SUITE_CCMP:
625 case WLAN_CIPHER_SUITE_CCMP_256:
626 case WLAN_CIPHER_SUITE_GCMP:
627 case WLAN_CIPHER_SUITE_GCMP_256:
628 if (!ieee80211_is_data_present(hdr->frame_control) &&
629 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
631 !ieee80211_is_group_privacy_action(tx->skb))
634 skip_hw = (tx->key->conf.flags &
635 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
636 ieee80211_is_mgmt(hdr->frame_control);
638 case WLAN_CIPHER_SUITE_AES_CMAC:
639 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
640 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
641 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
642 if (!ieee80211_is_mgmt(hdr->frame_control))
647 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
648 !ieee80211_is_deauth(hdr->frame_control)))
651 if (!skip_hw && tx->key &&
652 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
653 info->control.hw_key = &tx->key->conf;
659 static ieee80211_tx_result debug_noinline
660 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
662 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
663 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
664 struct ieee80211_supported_band *sband;
666 struct ieee80211_tx_rate_control txrc;
667 struct ieee80211_sta_rates *ratetbl = NULL;
670 memset(&txrc, 0, sizeof(txrc));
672 sband = tx->local->hw.wiphy->bands[info->band];
674 len = min_t(u32, tx->skb->len + FCS_LEN,
675 tx->local->hw.wiphy->frag_threshold);
677 /* set up the tx rate control struct we give the RC algo */
678 txrc.hw = &tx->local->hw;
680 txrc.bss_conf = &tx->sdata->vif.bss_conf;
682 txrc.reported_rate.idx = -1;
683 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
684 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
685 txrc.max_rate_idx = -1;
687 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
689 if (tx->sdata->rc_has_mcs_mask[info->band])
690 txrc.rate_idx_mcs_mask =
691 tx->sdata->rc_rateidx_mcs_mask[info->band];
693 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
694 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
695 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
696 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
698 /* set up RTS protection if desired */
699 if (len > tx->local->hw.wiphy->rts_threshold) {
703 info->control.use_rts = txrc.rts;
704 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
707 * Use short preamble if the BSS can handle it, but not for
708 * management frames unless we know the receiver can handle
709 * that -- the management frame might be to a station that
710 * just wants a probe response.
712 if (tx->sdata->vif.bss_conf.use_short_preamble &&
713 (ieee80211_is_data(hdr->frame_control) ||
714 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
715 txrc.short_preamble = true;
717 info->control.short_preamble = txrc.short_preamble;
719 /* don't ask rate control when rate already injected via radiotap */
720 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
724 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
727 * Lets not bother rate control if we're associated and cannot
728 * talk to the sta. This should not happen.
730 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
731 !rate_usable_index_exists(sband, &tx->sta->sta),
732 "%s: Dropped data frame as no usable bitrate found while "
733 "scanning and associated. Target station: "
734 "%pM on %d GHz band\n",
735 tx->sdata->name, hdr->addr1,
740 * If we're associated with the sta at this point we know we can at
741 * least send the frame at the lowest bit rate.
743 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
745 if (tx->sta && !info->control.skip_table)
746 ratetbl = rcu_dereference(tx->sta->sta.rates);
748 if (unlikely(info->control.rates[0].idx < 0)) {
750 struct ieee80211_tx_rate rate = {
751 .idx = ratetbl->rate[0].idx,
752 .flags = ratetbl->rate[0].flags,
753 .count = ratetbl->rate[0].count
756 if (ratetbl->rate[0].idx < 0)
764 tx->rate = info->control.rates[0];
767 if (txrc.reported_rate.idx < 0) {
768 txrc.reported_rate = tx->rate;
769 if (tx->sta && ieee80211_is_data(hdr->frame_control))
770 tx->sta->tx_stats.last_rate = txrc.reported_rate;
772 tx->sta->tx_stats.last_rate = txrc.reported_rate;
777 if (unlikely(!info->control.rates[0].count))
778 info->control.rates[0].count = 1;
780 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
781 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
782 info->control.rates[0].count = 1;
787 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
789 u16 *seq = &sta->tid_seq[tid];
790 __le16 ret = cpu_to_le16(*seq);
792 /* Increase the sequence number. */
793 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
798 static ieee80211_tx_result debug_noinline
799 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
801 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
802 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
807 * Packet injection may want to control the sequence
808 * number, if we have no matching interface then we
809 * neither assign one ourselves nor ask the driver to.
811 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
814 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
817 if (ieee80211_hdrlen(hdr->frame_control) < 24)
820 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
824 * Anything but QoS data that has a sequence number field
825 * (is long enough) gets a sequence number from the global
826 * counter. QoS data frames with a multicast destination
827 * also use the global counter (802.11-2012 9.3.2.10).
829 if (!ieee80211_is_data_qos(hdr->frame_control) ||
830 is_multicast_ether_addr(hdr->addr1)) {
831 /* driver should assign sequence number */
832 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
833 /* for pure STA mode without beacons, we can do it */
834 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
835 tx->sdata->sequence_number += 0x10;
837 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
842 * This should be true for injected/management frames only, for
843 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
844 * above since they are not QoS-data frames.
849 /* include per-STA, per-TID sequence counter */
851 qc = ieee80211_get_qos_ctl(hdr);
852 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
853 tx->sta->tx_stats.msdu[tid]++;
855 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
860 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
861 struct sk_buff *skb, int hdrlen,
864 struct ieee80211_local *local = tx->local;
865 struct ieee80211_tx_info *info;
867 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
868 int pos = hdrlen + per_fragm;
869 int rem = skb->len - hdrlen - per_fragm;
871 if (WARN_ON(rem < 0))
874 /* first fragment was already added to queue by caller */
877 int fraglen = per_fragm;
882 tmp = dev_alloc_skb(local->tx_headroom +
884 tx->sdata->encrypt_headroom +
885 IEEE80211_ENCRYPT_TAILROOM);
889 __skb_queue_tail(&tx->skbs, tmp);
892 local->tx_headroom + tx->sdata->encrypt_headroom);
894 /* copy control information */
895 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
897 info = IEEE80211_SKB_CB(tmp);
898 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
899 IEEE80211_TX_CTL_FIRST_FRAGMENT);
902 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
904 skb_copy_queue_mapping(tmp, skb);
905 tmp->priority = skb->priority;
908 /* copy header and data */
909 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
910 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
915 /* adjust first fragment's length */
916 skb_trim(skb, hdrlen + per_fragm);
920 static ieee80211_tx_result debug_noinline
921 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
923 struct sk_buff *skb = tx->skb;
924 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
925 struct ieee80211_hdr *hdr = (void *)skb->data;
926 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
930 /* no matter what happens, tx->skb moves to tx->skbs */
931 __skb_queue_tail(&tx->skbs, skb);
934 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
937 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
941 * Warn when submitting a fragmented A-MPDU frame and drop it.
942 * This scenario is handled in ieee80211_tx_prepare but extra
943 * caution taken here as fragmented ampdu may cause Tx stop.
945 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
948 hdrlen = ieee80211_hdrlen(hdr->frame_control);
950 /* internal error, why isn't DONTFRAG set? */
951 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
955 * Now fragment the frame. This will allocate all the fragments and
956 * chain them (using skb as the first fragment) to skb->next.
957 * During transmission, we will remove the successfully transmitted
958 * fragments from this list. When the low-level driver rejects one
959 * of the fragments then we will simply pretend to accept the skb
960 * but store it away as pending.
962 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
965 /* update duration/seq/flags of fragments */
968 skb_queue_walk(&tx->skbs, skb) {
969 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
971 hdr = (void *)skb->data;
972 info = IEEE80211_SKB_CB(skb);
974 if (!skb_queue_is_last(&tx->skbs, skb)) {
975 hdr->frame_control |= morefrags;
977 * No multi-rate retries for fragmented frames, that
978 * would completely throw off the NAV at other STAs.
980 info->control.rates[1].idx = -1;
981 info->control.rates[2].idx = -1;
982 info->control.rates[3].idx = -1;
983 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
984 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
986 hdr->frame_control &= ~morefrags;
988 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
995 static ieee80211_tx_result debug_noinline
996 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1004 skb_queue_walk(&tx->skbs, skb) {
1005 ac = skb_get_queue_mapping(skb);
1006 tx->sta->tx_stats.bytes[ac] += skb->len;
1009 tx->sta->tx_stats.packets[ac]++;
1014 static ieee80211_tx_result debug_noinline
1015 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1020 switch (tx->key->conf.cipher) {
1021 case WLAN_CIPHER_SUITE_WEP40:
1022 case WLAN_CIPHER_SUITE_WEP104:
1023 return ieee80211_crypto_wep_encrypt(tx);
1024 case WLAN_CIPHER_SUITE_TKIP:
1025 return ieee80211_crypto_tkip_encrypt(tx);
1026 case WLAN_CIPHER_SUITE_CCMP:
1027 return ieee80211_crypto_ccmp_encrypt(
1028 tx, IEEE80211_CCMP_MIC_LEN);
1029 case WLAN_CIPHER_SUITE_CCMP_256:
1030 return ieee80211_crypto_ccmp_encrypt(
1031 tx, IEEE80211_CCMP_256_MIC_LEN);
1032 case WLAN_CIPHER_SUITE_AES_CMAC:
1033 return ieee80211_crypto_aes_cmac_encrypt(tx);
1034 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1035 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1036 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1037 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1038 return ieee80211_crypto_aes_gmac_encrypt(tx);
1039 case WLAN_CIPHER_SUITE_GCMP:
1040 case WLAN_CIPHER_SUITE_GCMP_256:
1041 return ieee80211_crypto_gcmp_encrypt(tx);
1043 return ieee80211_crypto_hw_encrypt(tx);
1049 static ieee80211_tx_result debug_noinline
1050 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1052 struct sk_buff *skb;
1053 struct ieee80211_hdr *hdr;
1057 skb_queue_walk(&tx->skbs, skb) {
1058 hdr = (void *) skb->data;
1059 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1060 break; /* must not overwrite AID */
1061 if (!skb_queue_is_last(&tx->skbs, skb)) {
1062 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1063 next_len = next->len;
1066 group_addr = is_multicast_ether_addr(hdr->addr1);
1069 ieee80211_duration(tx, skb, group_addr, next_len);
1075 /* actual transmit path */
1077 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1078 struct sk_buff *skb,
1079 struct ieee80211_tx_info *info,
1080 struct tid_ampdu_tx *tid_tx,
1083 bool queued = false;
1084 bool reset_agg_timer = false;
1085 struct sk_buff *purge_skb = NULL;
1087 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1088 info->flags |= IEEE80211_TX_CTL_AMPDU;
1089 reset_agg_timer = true;
1090 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1092 * nothing -- this aggregation session is being started
1093 * but that might still fail with the driver
1095 } else if (!tx->sta->sta.txq[tid]) {
1096 spin_lock(&tx->sta->lock);
1098 * Need to re-check now, because we may get here
1100 * 1) in the window during which the setup is actually
1101 * already done, but not marked yet because not all
1102 * packets are spliced over to the driver pending
1103 * queue yet -- if this happened we acquire the lock
1104 * either before or after the splice happens, but
1105 * need to recheck which of these cases happened.
1107 * 2) during session teardown, if the OPERATIONAL bit
1108 * was cleared due to the teardown but the pointer
1109 * hasn't been assigned NULL yet (or we loaded it
1110 * before it was assigned) -- in this case it may
1111 * now be NULL which means we should just let the
1112 * packet pass through because splicing the frames
1113 * back is already done.
1115 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1118 /* do nothing, let packet pass through */
1119 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1120 info->flags |= IEEE80211_TX_CTL_AMPDU;
1121 reset_agg_timer = true;
1124 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1125 clear_sta_flag(tx->sta, WLAN_STA_SP);
1126 ps_dbg(tx->sta->sdata,
1127 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1128 tx->sta->sta.addr, tx->sta->sta.aid);
1130 info->control.vif = &tx->sdata->vif;
1131 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1132 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1133 __skb_queue_tail(&tid_tx->pending, skb);
1134 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1135 purge_skb = __skb_dequeue(&tid_tx->pending);
1137 spin_unlock(&tx->sta->lock);
1140 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1143 /* reset session timer */
1144 if (reset_agg_timer && tid_tx->timeout)
1145 tid_tx->last_tx = jiffies;
1152 * pass %NULL for the station if unknown, a valid pointer if known
1153 * or an ERR_PTR() if the station is known not to exist
1155 static ieee80211_tx_result
1156 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1157 struct ieee80211_tx_data *tx,
1158 struct sta_info *sta, struct sk_buff *skb)
1160 struct ieee80211_local *local = sdata->local;
1161 struct ieee80211_hdr *hdr;
1162 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1166 memset(tx, 0, sizeof(*tx));
1170 __skb_queue_head_init(&tx->skbs);
1173 * If this flag is set to true anywhere, and we get here,
1174 * we are doing the needed processing, so remove the flag
1177 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1179 hdr = (struct ieee80211_hdr *) skb->data;
1185 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1186 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1187 if (!tx->sta && sdata->wdev.use_4addr)
1189 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1190 IEEE80211_TX_CTL_INJECTED) ||
1191 tx->sdata->control_port_protocol == tx->skb->protocol) {
1192 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1194 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1195 tx->sta = sta_info_get(sdata, hdr->addr1);
1198 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1199 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1200 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1201 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1202 struct tid_ampdu_tx *tid_tx;
1204 qc = ieee80211_get_qos_ctl(hdr);
1205 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1207 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1211 queued = ieee80211_tx_prep_agg(tx, skb, info,
1214 if (unlikely(queued))
1219 if (is_multicast_ether_addr(hdr->addr1)) {
1220 tx->flags &= ~IEEE80211_TX_UNICAST;
1221 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1223 tx->flags |= IEEE80211_TX_UNICAST;
1225 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1226 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1227 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1228 info->flags & IEEE80211_TX_CTL_AMPDU)
1229 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1233 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1234 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1235 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1236 ieee80211_check_fast_xmit(tx->sta);
1239 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1244 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1245 struct ieee80211_vif *vif,
1246 struct ieee80211_sta *pubsta,
1247 struct sk_buff *skb)
1249 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1250 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1251 struct ieee80211_txq *txq = NULL;
1253 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1254 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1257 if (!ieee80211_is_data(hdr->frame_control))
1261 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1263 txq = pubsta->txq[tid];
1271 return to_txq_info(txq);
1274 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1276 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1279 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi)
1281 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif;
1284 static u32 codel_skb_len_func(const struct sk_buff *skb)
1289 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1291 const struct ieee80211_tx_info *info;
1293 info = (const struct ieee80211_tx_info *)skb->cb;
1294 return info->control.enqueue_time;
1297 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1300 struct ieee80211_local *local;
1301 struct txq_info *txqi;
1303 struct fq_flow *flow;
1306 local = vif_to_sdata(txqi->txq.vif)->local;
1309 if (cvars == &txqi->def_cvars)
1310 flow = &txqi->def_flow;
1312 flow = &fq->flows[cvars - local->cvars];
1314 return fq_flow_dequeue(fq, flow);
1317 static void codel_drop_func(struct sk_buff *skb,
1320 struct ieee80211_local *local;
1321 struct ieee80211_hw *hw;
1322 struct txq_info *txqi;
1325 local = vif_to_sdata(txqi->txq.vif)->local;
1328 ieee80211_free_txskb(hw, skb);
1331 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1333 struct fq_flow *flow)
1335 struct ieee80211_local *local;
1336 struct txq_info *txqi;
1337 struct codel_vars *cvars;
1338 struct codel_params *cparams;
1339 struct codel_stats *cstats;
1341 local = container_of(fq, struct ieee80211_local, fq);
1342 txqi = container_of(tin, struct txq_info, tin);
1343 cparams = &local->cparams;
1344 cstats = &txqi->cstats;
1346 if (flow == &txqi->def_flow)
1347 cvars = &txqi->def_cvars;
1349 cvars = &local->cvars[flow - fq->flows];
1351 return codel_dequeue(txqi,
1357 codel_skb_time_func,
1359 codel_dequeue_func);
1362 static void fq_skb_free_func(struct fq *fq,
1364 struct fq_flow *flow,
1365 struct sk_buff *skb)
1367 struct ieee80211_local *local;
1369 local = container_of(fq, struct ieee80211_local, fq);
1370 ieee80211_free_txskb(&local->hw, skb);
1373 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1376 struct sk_buff *skb)
1378 struct txq_info *txqi;
1380 txqi = container_of(tin, struct txq_info, tin);
1381 return &txqi->def_flow;
1384 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1385 struct txq_info *txqi,
1386 struct sk_buff *skb)
1388 struct fq *fq = &local->fq;
1389 struct fq_tin *tin = &txqi->tin;
1391 ieee80211_set_skb_enqueue_time(skb);
1392 fq_tin_enqueue(fq, tin, skb,
1394 fq_flow_get_default_func);
1397 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1398 struct sta_info *sta,
1399 struct txq_info *txqi, int tid)
1401 fq_tin_init(&txqi->tin);
1402 fq_flow_init(&txqi->def_flow);
1403 codel_vars_init(&txqi->def_cvars);
1404 codel_stats_init(&txqi->cstats);
1405 __skb_queue_head_init(&txqi->frags);
1407 txqi->txq.vif = &sdata->vif;
1410 txqi->txq.sta = &sta->sta;
1411 sta->sta.txq[tid] = &txqi->txq;
1412 txqi->txq.tid = tid;
1413 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
1415 sdata->vif.txq = &txqi->txq;
1417 txqi->txq.ac = IEEE80211_AC_BE;
1421 void ieee80211_txq_purge(struct ieee80211_local *local,
1422 struct txq_info *txqi)
1424 struct fq *fq = &local->fq;
1425 struct fq_tin *tin = &txqi->tin;
1427 fq_tin_reset(fq, tin, fq_skb_free_func);
1428 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1431 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1433 struct fq *fq = &local->fq;
1436 bool supp_vht = false;
1437 enum nl80211_band band;
1439 if (!local->ops->wake_tx_queue)
1442 ret = fq_init(fq, 4096);
1447 * If the hardware doesn't support VHT, it is safe to limit the maximum
1448 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1450 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1451 struct ieee80211_supported_band *sband;
1453 sband = local->hw.wiphy->bands[band];
1457 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1461 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1463 codel_params_init(&local->cparams);
1464 local->cparams.interval = MS2TIME(100);
1465 local->cparams.target = MS2TIME(20);
1466 local->cparams.ecn = true;
1468 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1470 if (!local->cvars) {
1471 spin_lock_bh(&fq->lock);
1472 fq_reset(fq, fq_skb_free_func);
1473 spin_unlock_bh(&fq->lock);
1477 for (i = 0; i < fq->flows_cnt; i++)
1478 codel_vars_init(&local->cvars[i]);
1483 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1485 struct fq *fq = &local->fq;
1487 if (!local->ops->wake_tx_queue)
1490 kfree(local->cvars);
1491 local->cvars = NULL;
1493 spin_lock_bh(&fq->lock);
1494 fq_reset(fq, fq_skb_free_func);
1495 spin_unlock_bh(&fq->lock);
1498 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1499 struct ieee80211_sub_if_data *sdata,
1500 struct sta_info *sta,
1501 struct sk_buff *skb)
1503 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1504 struct fq *fq = &local->fq;
1505 struct ieee80211_vif *vif;
1506 struct txq_info *txqi;
1507 struct ieee80211_sta *pubsta;
1509 if (!local->ops->wake_tx_queue ||
1510 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1513 if (sta && sta->uploaded)
1518 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1519 sdata = container_of(sdata->bss,
1520 struct ieee80211_sub_if_data, u.ap);
1523 txqi = ieee80211_get_txq(local, vif, pubsta, skb);
1528 info->control.vif = vif;
1530 spin_lock_bh(&fq->lock);
1531 ieee80211_txq_enqueue(local, txqi, skb);
1532 spin_unlock_bh(&fq->lock);
1534 drv_wake_tx_queue(local, txqi);
1539 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1540 struct ieee80211_vif *vif,
1541 struct ieee80211_sta *sta,
1542 struct sk_buff_head *skbs,
1545 struct ieee80211_tx_control control = {};
1546 struct sk_buff *skb, *tmp;
1547 unsigned long flags;
1549 skb_queue_walk_safe(skbs, skb, tmp) {
1550 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1551 int q = info->hw_queue;
1553 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1554 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1555 __skb_unlink(skb, skbs);
1556 ieee80211_free_txskb(&local->hw, skb);
1561 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1562 if (local->queue_stop_reasons[q] ||
1563 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1564 if (unlikely(info->flags &
1565 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1566 if (local->queue_stop_reasons[q] &
1567 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1569 * Drop off-channel frames if queues
1570 * are stopped for any reason other
1571 * than off-channel operation. Never
1574 spin_unlock_irqrestore(
1575 &local->queue_stop_reason_lock,
1577 ieee80211_purge_tx_queue(&local->hw,
1584 * Since queue is stopped, queue up frames for
1585 * later transmission from the tx-pending
1586 * tasklet when the queue is woken again.
1589 skb_queue_splice_init(skbs,
1590 &local->pending[q]);
1592 skb_queue_splice_tail_init(skbs,
1593 &local->pending[q]);
1595 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1600 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1602 info->control.vif = vif;
1605 __skb_unlink(skb, skbs);
1606 drv_tx(local, &control, skb);
1613 * Returns false if the frame couldn't be transmitted but was queued instead.
1615 static bool __ieee80211_tx(struct ieee80211_local *local,
1616 struct sk_buff_head *skbs, int led_len,
1617 struct sta_info *sta, bool txpending)
1619 struct ieee80211_tx_info *info;
1620 struct ieee80211_sub_if_data *sdata;
1621 struct ieee80211_vif *vif;
1622 struct ieee80211_sta *pubsta;
1623 struct sk_buff *skb;
1627 if (WARN_ON(skb_queue_empty(skbs)))
1630 skb = skb_peek(skbs);
1631 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1632 info = IEEE80211_SKB_CB(skb);
1633 sdata = vif_to_sdata(info->control.vif);
1634 if (sta && !sta->uploaded)
1642 switch (sdata->vif.type) {
1643 case NL80211_IFTYPE_MONITOR:
1644 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1648 sdata = rcu_dereference(local->monitor_sdata);
1652 vif->hw_queue[skb_get_queue_mapping(skb)];
1653 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1654 ieee80211_purge_tx_queue(&local->hw, skbs);
1659 case NL80211_IFTYPE_AP_VLAN:
1660 sdata = container_of(sdata->bss,
1661 struct ieee80211_sub_if_data, u.ap);
1668 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1671 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1673 WARN_ON_ONCE(!skb_queue_empty(skbs));
1679 * Invoke TX handlers, return 0 on success and non-zero if the
1680 * frame was dropped or queued.
1682 * The handlers are split into an early and late part. The latter is everything
1683 * that can be sensitive to reordering, and will be deferred to after packets
1684 * are dequeued from the intermediate queues (when they are enabled).
1686 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1688 ieee80211_tx_result res = TX_DROP;
1690 #define CALL_TXH(txh) \
1693 if (res != TX_CONTINUE) \
1697 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1698 CALL_TXH(ieee80211_tx_h_check_assoc);
1699 CALL_TXH(ieee80211_tx_h_ps_buf);
1700 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1701 CALL_TXH(ieee80211_tx_h_select_key);
1702 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1703 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1706 if (unlikely(res == TX_DROP)) {
1707 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1709 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1711 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1713 } else if (unlikely(res == TX_QUEUED)) {
1714 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1722 * Late handlers can be called while the sta lock is held. Handlers that can
1723 * cause packets to be generated will cause deadlock!
1725 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1727 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1728 ieee80211_tx_result res = TX_CONTINUE;
1730 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1731 __skb_queue_tail(&tx->skbs, tx->skb);
1736 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1737 CALL_TXH(ieee80211_tx_h_sequence);
1738 CALL_TXH(ieee80211_tx_h_fragment);
1739 /* handlers after fragment must be aware of tx info fragmentation! */
1740 CALL_TXH(ieee80211_tx_h_stats);
1741 CALL_TXH(ieee80211_tx_h_encrypt);
1742 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1743 CALL_TXH(ieee80211_tx_h_calculate_duration);
1747 if (unlikely(res == TX_DROP)) {
1748 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1750 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1752 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1754 } else if (unlikely(res == TX_QUEUED)) {
1755 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1762 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1764 int r = invoke_tx_handlers_early(tx);
1768 return invoke_tx_handlers_late(tx);
1771 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1772 struct ieee80211_vif *vif, struct sk_buff *skb,
1773 int band, struct ieee80211_sta **sta)
1775 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1776 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1777 struct ieee80211_tx_data tx;
1778 struct sk_buff *skb2;
1780 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1784 info->control.vif = vif;
1785 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1787 if (invoke_tx_handlers(&tx))
1792 *sta = &tx.sta->sta;
1797 /* this function isn't suitable for fragmented data frames */
1798 skb2 = __skb_dequeue(&tx.skbs);
1799 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1800 ieee80211_free_txskb(hw, skb2);
1801 ieee80211_purge_tx_queue(hw, &tx.skbs);
1807 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1810 * Returns false if the frame couldn't be transmitted but was queued instead.
1812 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1813 struct sta_info *sta, struct sk_buff *skb,
1816 struct ieee80211_local *local = sdata->local;
1817 struct ieee80211_tx_data tx;
1818 ieee80211_tx_result res_prepare;
1819 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1823 if (unlikely(skb->len < 10)) {
1828 /* initialises tx */
1830 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1832 if (unlikely(res_prepare == TX_DROP)) {
1833 ieee80211_free_txskb(&local->hw, skb);
1835 } else if (unlikely(res_prepare == TX_QUEUED)) {
1839 /* set up hw_queue value early */
1840 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1841 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1843 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1845 if (invoke_tx_handlers_early(&tx))
1848 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1851 if (!invoke_tx_handlers_late(&tx))
1852 result = __ieee80211_tx(local, &tx.skbs, led_len,
1858 /* device xmit handlers */
1860 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1861 struct sk_buff *skb,
1862 int head_need, bool may_encrypt)
1864 struct ieee80211_local *local = sdata->local;
1867 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1868 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1869 tail_need -= skb_tailroom(skb);
1870 tail_need = max_t(int, tail_need, 0);
1873 if (skb_cloned(skb) &&
1874 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1875 !skb_clone_writable(skb, ETH_HLEN) ||
1876 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1877 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1878 else if (head_need || tail_need)
1879 I802_DEBUG_INC(local->tx_expand_skb_head);
1883 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1884 wiphy_debug(local->hw.wiphy,
1885 "failed to reallocate TX buffer\n");
1892 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1893 struct sta_info *sta, struct sk_buff *skb)
1895 struct ieee80211_local *local = sdata->local;
1896 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1897 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1901 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1903 headroom = local->tx_headroom;
1905 headroom += sdata->encrypt_headroom;
1906 headroom -= skb_headroom(skb);
1907 headroom = max_t(int, 0, headroom);
1909 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1910 ieee80211_free_txskb(&local->hw, skb);
1914 hdr = (struct ieee80211_hdr *) skb->data;
1915 info->control.vif = &sdata->vif;
1917 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1918 if (ieee80211_is_data(hdr->frame_control) &&
1919 is_unicast_ether_addr(hdr->addr1)) {
1920 if (mesh_nexthop_resolve(sdata, skb))
1921 return; /* skb queued: don't free */
1923 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1927 ieee80211_set_qos_hdr(sdata, skb);
1928 ieee80211_tx(sdata, sta, skb, false);
1931 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1932 struct sk_buff *skb)
1934 struct ieee80211_radiotap_iterator iterator;
1935 struct ieee80211_radiotap_header *rthdr =
1936 (struct ieee80211_radiotap_header *) skb->data;
1937 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1938 struct ieee80211_supported_band *sband =
1939 local->hw.wiphy->bands[info->band];
1940 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1944 bool rate_found = false;
1945 u8 rate_retries = 0;
1947 u8 mcs_known, mcs_flags, mcs_bw;
1949 u8 vht_mcs = 0, vht_nss = 0;
1952 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1953 IEEE80211_TX_CTL_DONTFRAG;
1956 * for every radiotap entry that is present
1957 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1958 * entries present, or -EINVAL on error)
1962 ret = ieee80211_radiotap_iterator_next(&iterator);
1967 /* see if this argument is something we can use */
1968 switch (iterator.this_arg_index) {
1970 * You must take care when dereferencing iterator.this_arg
1971 * for multibyte types... the pointer is not aligned. Use
1972 * get_unaligned((type *)iterator.this_arg) to dereference
1973 * iterator.this_arg for type "type" safely on all arches.
1975 case IEEE80211_RADIOTAP_FLAGS:
1976 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1978 * this indicates that the skb we have been
1979 * handed has the 32-bit FCS CRC at the end...
1980 * we should react to that by snipping it off
1981 * because it will be recomputed and added
1984 if (skb->len < (iterator._max_length + FCS_LEN))
1987 skb_trim(skb, skb->len - FCS_LEN);
1989 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1990 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1991 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1992 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1995 case IEEE80211_RADIOTAP_TX_FLAGS:
1996 txflags = get_unaligned_le16(iterator.this_arg);
1997 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1998 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2001 case IEEE80211_RADIOTAP_RATE:
2002 rate = *iterator.this_arg;
2007 case IEEE80211_RADIOTAP_DATA_RETRIES:
2008 rate_retries = *iterator.this_arg;
2011 case IEEE80211_RADIOTAP_MCS:
2012 mcs_known = iterator.this_arg[0];
2013 mcs_flags = iterator.this_arg[1];
2014 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2018 rate = iterator.this_arg[2];
2019 rate_flags = IEEE80211_TX_RC_MCS;
2021 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2022 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2023 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2025 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2026 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2027 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2028 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2031 case IEEE80211_RADIOTAP_VHT:
2032 vht_known = get_unaligned_le16(iterator.this_arg);
2035 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2036 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2037 (iterator.this_arg[2] &
2038 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2039 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2041 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2042 if (iterator.this_arg[3] == 1)
2044 IEEE80211_TX_RC_40_MHZ_WIDTH;
2045 else if (iterator.this_arg[3] == 4)
2047 IEEE80211_TX_RC_80_MHZ_WIDTH;
2048 else if (iterator.this_arg[3] == 11)
2050 IEEE80211_TX_RC_160_MHZ_WIDTH;
2053 vht_mcs = iterator.this_arg[4] >> 4;
2054 vht_nss = iterator.this_arg[4] & 0xF;
2058 * Please update the file
2059 * Documentation/networking/mac80211-injection.txt
2060 * when parsing new fields here.
2068 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2072 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2074 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2075 info->control.rates[i].idx = -1;
2076 info->control.rates[i].flags = 0;
2077 info->control.rates[i].count = 0;
2080 if (rate_flags & IEEE80211_TX_RC_MCS) {
2081 info->control.rates[0].idx = rate;
2082 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2083 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2086 for (i = 0; i < sband->n_bitrates; i++) {
2087 if (rate * 5 != sband->bitrates[i].bitrate)
2090 info->control.rates[0].idx = i;
2095 if (info->control.rates[0].idx < 0)
2096 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2098 info->control.rates[0].flags = rate_flags;
2099 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2100 local->hw.max_rate_tries);
2104 * remove the radiotap header
2105 * iterator->_max_length was sanity-checked against
2106 * skb->len by iterator init
2108 skb_pull(skb, iterator._max_length);
2113 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2114 struct net_device *dev)
2116 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2117 struct ieee80211_chanctx_conf *chanctx_conf;
2118 struct ieee80211_radiotap_header *prthdr =
2119 (struct ieee80211_radiotap_header *)skb->data;
2120 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2121 struct ieee80211_hdr *hdr;
2122 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2123 struct cfg80211_chan_def *chandef;
2127 /* check for not even having the fixed radiotap header part */
2128 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2129 goto fail; /* too short to be possibly valid */
2131 /* is it a header version we can trust to find length from? */
2132 if (unlikely(prthdr->it_version))
2133 goto fail; /* only version 0 is supported */
2135 /* then there must be a radiotap header with a length we can use */
2136 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2138 /* does the skb contain enough to deliver on the alleged length? */
2139 if (unlikely(skb->len < len_rthdr))
2140 goto fail; /* skb too short for claimed rt header extent */
2143 * fix up the pointers accounting for the radiotap
2144 * header still being in there. We are being given
2145 * a precooked IEEE80211 header so no need for
2148 skb_set_mac_header(skb, len_rthdr);
2150 * these are just fixed to the end of the rt area since we
2151 * don't have any better information and at this point, nobody cares
2153 skb_set_network_header(skb, len_rthdr);
2154 skb_set_transport_header(skb, len_rthdr);
2156 if (skb->len < len_rthdr + 2)
2159 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2160 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2162 if (skb->len < len_rthdr + hdrlen)
2166 * Initialize skb->protocol if the injected frame is a data frame
2167 * carrying a rfc1042 header
2169 if (ieee80211_is_data(hdr->frame_control) &&
2170 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2171 u8 *payload = (u8 *)hdr + hdrlen;
2173 if (ether_addr_equal(payload, rfc1042_header))
2174 skb->protocol = cpu_to_be16((payload[6] << 8) |
2178 memset(info, 0, sizeof(*info));
2180 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2181 IEEE80211_TX_CTL_INJECTED;
2186 * We process outgoing injected frames that have a local address
2187 * we handle as though they are non-injected frames.
2188 * This code here isn't entirely correct, the local MAC address
2189 * isn't always enough to find the interface to use; for proper
2190 * VLAN/WDS support we will need a different mechanism (which
2191 * likely isn't going to be monitor interfaces).
2193 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2195 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2196 if (!ieee80211_sdata_running(tmp_sdata))
2198 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2199 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2200 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2202 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2208 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2209 if (!chanctx_conf) {
2210 tmp_sdata = rcu_dereference(local->monitor_sdata);
2213 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2217 chandef = &chanctx_conf->def;
2218 else if (!local->use_chanctx)
2219 chandef = &local->_oper_chandef;
2224 * Frame injection is not allowed if beaconing is not allowed
2225 * or if we need radar detection. Beaconing is usually not allowed when
2226 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2227 * Passive scan is also used in world regulatory domains where
2228 * your country is not known and as such it should be treated as
2229 * NO TX unless the channel is explicitly allowed in which case
2230 * your current regulatory domain would not have the passive scan
2233 * Since AP mode uses monitor interfaces to inject/TX management
2234 * frames we can make AP mode the exception to this rule once it
2235 * supports radar detection as its implementation can deal with
2236 * radar detection by itself. We can do that later by adding a
2237 * monitor flag interfaces used for AP support.
2239 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2243 info->band = chandef->chan->band;
2245 /* process and remove the injection radiotap header */
2246 if (!ieee80211_parse_tx_radiotap(local, skb))
2249 ieee80211_xmit(sdata, NULL, skb);
2252 return NETDEV_TX_OK;
2258 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2261 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2263 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2265 return ethertype == ETH_P_TDLS &&
2267 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2270 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2271 struct sk_buff *skb,
2272 struct sta_info **sta_out)
2274 struct sta_info *sta;
2276 switch (sdata->vif.type) {
2277 case NL80211_IFTYPE_AP_VLAN:
2278 sta = rcu_dereference(sdata->u.vlan.sta);
2282 } else if (sdata->wdev.use_4addr) {
2286 case NL80211_IFTYPE_AP:
2287 case NL80211_IFTYPE_OCB:
2288 case NL80211_IFTYPE_ADHOC:
2289 if (is_multicast_ether_addr(skb->data)) {
2290 *sta_out = ERR_PTR(-ENOENT);
2293 sta = sta_info_get_bss(sdata, skb->data);
2295 case NL80211_IFTYPE_WDS:
2296 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2298 #ifdef CONFIG_MAC80211_MESH
2299 case NL80211_IFTYPE_MESH_POINT:
2300 /* determined much later */
2304 case NL80211_IFTYPE_STATION:
2305 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2306 sta = sta_info_get(sdata, skb->data);
2307 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2308 if (test_sta_flag(sta,
2309 WLAN_STA_TDLS_PEER_AUTH)) {
2315 * TDLS link during setup - throw out frames to
2316 * peer. Allow TDLS-setup frames to unauthorized
2317 * peers for the special case of a link teardown
2318 * after a TDLS sta is removed due to being
2321 if (!ieee80211_is_tdls_setup(skb))
2327 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2335 *sta_out = sta ?: ERR_PTR(-ENOENT);
2340 * ieee80211_build_hdr - build 802.11 header in the given frame
2341 * @sdata: virtual interface to build the header for
2342 * @skb: the skb to build the header in
2343 * @info_flags: skb flags to set
2345 * This function takes the skb with 802.3 header and reformats the header to
2346 * the appropriate IEEE 802.11 header based on which interface the packet is
2347 * being transmitted on.
2349 * Note that this function also takes care of the TX status request and
2350 * potential unsharing of the SKB - this needs to be interleaved with the
2353 * The function requires the read-side RCU lock held
2355 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2357 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2358 struct sk_buff *skb, u32 info_flags,
2359 struct sta_info *sta)
2361 struct ieee80211_local *local = sdata->local;
2362 struct ieee80211_tx_info *info;
2364 u16 ethertype, hdrlen, meshhdrlen = 0;
2366 struct ieee80211_hdr hdr;
2367 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2368 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2369 const u8 *encaps_data;
2370 int encaps_len, skip_header_bytes;
2371 bool wme_sta = false, authorized = false;
2375 struct ieee80211_chanctx_conf *chanctx_conf;
2376 struct ieee80211_sub_if_data *ap_sdata;
2377 enum nl80211_band band;
2383 /* convert Ethernet header to proper 802.11 header (based on
2384 * operation mode) */
2385 ethertype = (skb->data[12] << 8) | skb->data[13];
2386 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2388 switch (sdata->vif.type) {
2389 case NL80211_IFTYPE_AP_VLAN:
2390 if (sdata->wdev.use_4addr) {
2391 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2393 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2394 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2395 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2396 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2398 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2399 wme_sta = sta->sta.wme;
2401 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2403 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2404 if (!chanctx_conf) {
2408 band = chanctx_conf->def.chan->band;
2409 if (sdata->wdev.use_4addr)
2412 case NL80211_IFTYPE_AP:
2413 if (sdata->vif.type == NL80211_IFTYPE_AP)
2414 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2415 if (!chanctx_conf) {
2419 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2421 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2422 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2423 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2425 band = chanctx_conf->def.chan->band;
2427 case NL80211_IFTYPE_WDS:
2428 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2430 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2431 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2432 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2433 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2436 * This is the exception! WDS style interfaces are prohibited
2437 * when channel contexts are in used so this must be valid
2439 band = local->hw.conf.chandef.chan->band;
2441 #ifdef CONFIG_MAC80211_MESH
2442 case NL80211_IFTYPE_MESH_POINT:
2443 if (!is_multicast_ether_addr(skb->data)) {
2444 struct sta_info *next_hop;
2445 bool mpp_lookup = true;
2447 mpath = mesh_path_lookup(sdata, skb->data);
2450 next_hop = rcu_dereference(mpath->next_hop);
2452 !(mpath->flags & (MESH_PATH_ACTIVE |
2453 MESH_PATH_RESOLVING)))
2458 mppath = mpp_path_lookup(sdata, skb->data);
2460 mppath->exp_time = jiffies;
2463 if (mppath && mpath)
2464 mesh_path_del(sdata, mpath->dst);
2468 * Use address extension if it is a packet from
2469 * another interface or if we know the destination
2470 * is being proxied by a portal (i.e. portal address
2471 * differs from proxied address)
2473 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2474 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2475 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2476 skb->data, skb->data + ETH_ALEN);
2477 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2480 /* DS -> MBSS (802.11-2012 13.11.3.3).
2481 * For unicast with unknown forwarding information,
2482 * destination might be in the MBSS or if that fails
2483 * forwarded to another mesh gate. In either case
2484 * resolution will be handled in ieee80211_xmit(), so
2485 * leave the original DA. This also works for mcast */
2486 const u8 *mesh_da = skb->data;
2489 mesh_da = mppath->mpp;
2491 mesh_da = mpath->dst;
2493 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2494 mesh_da, sdata->vif.addr);
2495 if (is_multicast_ether_addr(mesh_da))
2496 /* DA TA mSA AE:SA */
2497 meshhdrlen = ieee80211_new_mesh_header(
2499 skb->data + ETH_ALEN, NULL);
2501 /* RA TA mDA mSA AE:DA SA */
2502 meshhdrlen = ieee80211_new_mesh_header(
2503 sdata, &mesh_hdr, skb->data,
2504 skb->data + ETH_ALEN);
2507 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2508 if (!chanctx_conf) {
2512 band = chanctx_conf->def.chan->band;
2515 case NL80211_IFTYPE_STATION:
2516 /* we already did checks when looking up the RA STA */
2517 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2521 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2522 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2523 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2525 } else if (sdata->u.mgd.use_4addr &&
2526 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2527 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2528 IEEE80211_FCTL_TODS);
2530 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2531 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2532 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2533 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2536 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2538 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2539 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2540 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2543 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2544 if (!chanctx_conf) {
2548 band = chanctx_conf->def.chan->band;
2550 case NL80211_IFTYPE_OCB:
2552 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2553 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2554 eth_broadcast_addr(hdr.addr3);
2556 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2557 if (!chanctx_conf) {
2561 band = chanctx_conf->def.chan->band;
2563 case NL80211_IFTYPE_ADHOC:
2565 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2566 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2567 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2569 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2570 if (!chanctx_conf) {
2574 band = chanctx_conf->def.chan->band;
2581 multicast = is_multicast_ether_addr(hdr.addr1);
2583 /* sta is always NULL for mesh */
2585 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2586 wme_sta = sta->sta.wme;
2587 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2588 /* For mesh, the use of the QoS header is mandatory */
2592 /* receiver does QoS (which also means we do) use it */
2594 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2599 * Drop unicast frames to unauthorised stations unless they are
2600 * EAPOL frames from the local station.
2602 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2603 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2604 !multicast && !authorized &&
2605 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2606 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2607 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2608 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2609 sdata->name, hdr.addr1);
2612 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2618 if (unlikely(!multicast && skb->sk &&
2619 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2620 struct sk_buff *ack_skb = skb_clone_sk(skb);
2623 unsigned long flags;
2626 spin_lock_irqsave(&local->ack_status_lock, flags);
2627 id = idr_alloc(&local->ack_status_frames, ack_skb,
2628 1, 0x10000, GFP_ATOMIC);
2629 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2633 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2641 * If the skb is shared we need to obtain our own copy.
2643 if (skb_shared(skb)) {
2644 struct sk_buff *tmp_skb = skb;
2646 /* can't happen -- skb is a clone if info_id != 0 */
2649 skb = skb_clone(skb, GFP_ATOMIC);
2658 hdr.frame_control = fc;
2659 hdr.duration_id = 0;
2662 skip_header_bytes = ETH_HLEN;
2663 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2664 encaps_data = bridge_tunnel_header;
2665 encaps_len = sizeof(bridge_tunnel_header);
2666 skip_header_bytes -= 2;
2667 } else if (ethertype >= ETH_P_802_3_MIN) {
2668 encaps_data = rfc1042_header;
2669 encaps_len = sizeof(rfc1042_header);
2670 skip_header_bytes -= 2;
2676 skb_pull(skb, skip_header_bytes);
2677 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2680 * So we need to modify the skb header and hence need a copy of
2681 * that. The head_need variable above doesn't, so far, include
2682 * the needed header space that we don't need right away. If we
2683 * can, then we don't reallocate right now but only after the
2684 * frame arrives at the master device (if it does...)
2686 * If we cannot, however, then we will reallocate to include all
2687 * the ever needed space. Also, if we need to reallocate it anyway,
2688 * make it big enough for everything we may ever need.
2691 if (head_need > 0 || skb_cloned(skb)) {
2692 head_need += sdata->encrypt_headroom;
2693 head_need += local->tx_headroom;
2694 head_need = max_t(int, 0, head_need);
2695 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2696 ieee80211_free_txskb(&local->hw, skb);
2698 return ERR_PTR(-ENOMEM);
2703 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2705 #ifdef CONFIG_MAC80211_MESH
2707 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2710 if (ieee80211_is_data_qos(fc)) {
2711 __le16 *qos_control;
2713 qos_control = (__le16 *) skb_push(skb, 2);
2714 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2716 * Maybe we could actually set some fields here, for now just
2717 * initialise to zero to indicate no special operation.
2721 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2723 skb_reset_mac_header(skb);
2725 info = IEEE80211_SKB_CB(skb);
2726 memset(info, 0, sizeof(*info));
2728 info->flags = info_flags;
2729 info->ack_frame_id = info_id;
2735 return ERR_PTR(ret);
2739 * fast-xmit overview
2741 * The core idea of this fast-xmit is to remove per-packet checks by checking
2742 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2743 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2744 * much less work can be done per packet. For example, fragmentation must be
2745 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2748 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2749 * header and other data to aid packet processing in ieee80211_xmit_fast().
2751 * The most difficult part of this is that when any of these assumptions
2752 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2753 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2754 * since the per-packet code no longer checks the conditions. This is reflected
2755 * by the calls to these functions throughout the rest of the code, and must be
2756 * maintained if any of the TX path checks change.
2759 void ieee80211_check_fast_xmit(struct sta_info *sta)
2761 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2762 struct ieee80211_local *local = sta->local;
2763 struct ieee80211_sub_if_data *sdata = sta->sdata;
2764 struct ieee80211_hdr *hdr = (void *)build.hdr;
2765 struct ieee80211_chanctx_conf *chanctx_conf;
2768 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2771 /* Locking here protects both the pointer itself, and against concurrent
2772 * invocations winning data access races to, e.g., the key pointer that
2774 * Without it, the invocation of this function right after the key
2775 * pointer changes wouldn't be sufficient, as another CPU could access
2776 * the pointer, then stall, and then do the cache update after the CPU
2777 * that invalidated the key.
2778 * With the locking, such scenarios cannot happen as the check for the
2779 * key and the fast-tx assignment are done atomically, so the CPU that
2780 * modifies the key will either wait or other one will see the key
2781 * cleared/changed already.
2783 spin_lock_bh(&sta->lock);
2784 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2785 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2786 sdata->vif.type == NL80211_IFTYPE_STATION)
2789 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2792 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2793 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2794 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2795 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2798 if (sdata->noack_map)
2801 /* fast-xmit doesn't handle fragmentation at all */
2802 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2803 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2807 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2808 if (!chanctx_conf) {
2812 build.band = chanctx_conf->def.chan->band;
2815 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2817 switch (sdata->vif.type) {
2818 case NL80211_IFTYPE_ADHOC:
2820 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2821 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2822 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2825 case NL80211_IFTYPE_STATION:
2826 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2828 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2829 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2830 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2835 if (sdata->u.mgd.use_4addr) {
2836 /* non-regular ethertype cannot use the fastpath */
2837 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2838 IEEE80211_FCTL_TODS);
2840 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2841 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2842 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2843 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2847 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2849 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2850 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2851 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2854 case NL80211_IFTYPE_AP_VLAN:
2855 if (sdata->wdev.use_4addr) {
2856 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2857 IEEE80211_FCTL_TODS);
2859 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2860 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2861 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2862 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2867 case NL80211_IFTYPE_AP:
2868 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2870 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2871 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2872 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2876 /* not handled on fast-xmit */
2882 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2885 /* We store the key here so there's no point in using rcu_dereference()
2886 * but that's fine because the code that changes the pointers will call
2887 * this function after doing so. For a single CPU that would be enough,
2888 * for multiple see the comment above.
2890 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2892 build.key = rcu_access_pointer(sdata->default_unicast_key);
2894 bool gen_iv, iv_spc, mmic;
2896 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2897 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2898 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2900 /* don't handle software crypto */
2901 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2904 switch (build.key->conf.cipher) {
2905 case WLAN_CIPHER_SUITE_CCMP:
2906 case WLAN_CIPHER_SUITE_CCMP_256:
2907 /* add fixed key ID */
2909 (build.hdr + build.hdr_len)[3] =
2910 0x20 | (build.key->conf.keyidx << 6);
2911 build.pn_offs = build.hdr_len;
2913 if (gen_iv || iv_spc)
2914 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2916 case WLAN_CIPHER_SUITE_GCMP:
2917 case WLAN_CIPHER_SUITE_GCMP_256:
2918 /* add fixed key ID */
2920 (build.hdr + build.hdr_len)[3] =
2921 0x20 | (build.key->conf.keyidx << 6);
2922 build.pn_offs = build.hdr_len;
2924 if (gen_iv || iv_spc)
2925 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2927 case WLAN_CIPHER_SUITE_TKIP:
2928 /* cannot handle MMIC or IV generation in xmit-fast */
2932 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2934 case WLAN_CIPHER_SUITE_WEP40:
2935 case WLAN_CIPHER_SUITE_WEP104:
2936 /* cannot handle IV generation in fast-xmit */
2940 build.hdr_len += IEEE80211_WEP_IV_LEN;
2942 case WLAN_CIPHER_SUITE_AES_CMAC:
2943 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2944 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2945 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2947 "management cipher suite 0x%x enabled for data\n",
2948 build.key->conf.cipher);
2951 /* we don't know how to generate IVs for this at all */
2952 if (WARN_ON(gen_iv))
2954 /* pure hardware keys are OK, of course */
2955 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2957 /* cipher scheme might require space allocation */
2959 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2962 build.hdr_len += build.key->conf.iv_len;
2965 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2968 hdr->frame_control = fc;
2970 memcpy(build.hdr + build.hdr_len,
2971 rfc1042_header, sizeof(rfc1042_header));
2972 build.hdr_len += sizeof(rfc1042_header);
2974 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2975 /* if the kmemdup fails, continue w/o fast_tx */
2980 /* we might have raced against another call to this function */
2981 old = rcu_dereference_protected(sta->fast_tx,
2982 lockdep_is_held(&sta->lock));
2983 rcu_assign_pointer(sta->fast_tx, fast_tx);
2985 kfree_rcu(old, rcu_head);
2986 spin_unlock_bh(&sta->lock);
2989 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2991 struct sta_info *sta;
2994 list_for_each_entry_rcu(sta, &local->sta_list, list)
2995 ieee80211_check_fast_xmit(sta);
2999 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3001 struct ieee80211_local *local = sdata->local;
3002 struct sta_info *sta;
3006 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3007 if (sdata != sta->sdata &&
3008 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3010 ieee80211_check_fast_xmit(sta);
3016 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3018 struct ieee80211_fast_tx *fast_tx;
3020 spin_lock_bh(&sta->lock);
3021 fast_tx = rcu_dereference_protected(sta->fast_tx,
3022 lockdep_is_held(&sta->lock));
3023 RCU_INIT_POINTER(sta->fast_tx, NULL);
3024 spin_unlock_bh(&sta->lock);
3027 kfree_rcu(fast_tx, rcu_head);
3030 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3031 struct sk_buff *skb, int headroom,
3034 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3035 int padding = (4 - amsdu_len) & 3;
3037 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3038 I802_DEBUG_INC(local->tx_expand_skb_head);
3040 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3041 wiphy_debug(local->hw.wiphy,
3042 "failed to reallocate TX buffer\n");
3048 *subframe_len += padding;
3049 memset(skb_put(skb, padding), 0, padding);
3055 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3056 struct ieee80211_fast_tx *fast_tx,
3057 struct sk_buff *skb)
3059 struct ieee80211_local *local = sdata->local;
3060 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3061 struct ieee80211_hdr *hdr;
3062 struct ethhdr *amsdu_hdr;
3063 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3064 int subframe_len = skb->len - hdr_len;
3066 u8 *qc, *h_80211_src, *h_80211_dst;
3069 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3072 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3075 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr),
3079 data = skb_push(skb, sizeof(*amsdu_hdr));
3080 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3082 amsdu_hdr = data + hdr_len;
3083 /* h_80211_src/dst is addr* field within hdr */
3084 h_80211_src = data + fast_tx->sa_offs;
3085 h_80211_dst = data + fast_tx->da_offs;
3087 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3088 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3089 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3091 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3092 * fields needs to be changed to BSSID for A-MSDU frames depending
3093 * on FromDS/ToDS values.
3095 switch (sdata->vif.type) {
3096 case NL80211_IFTYPE_STATION:
3097 bssid = sdata->u.mgd.bssid;
3099 case NL80211_IFTYPE_AP:
3100 case NL80211_IFTYPE_AP_VLAN:
3101 bssid = sdata->vif.addr;
3107 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3108 ether_addr_copy(h_80211_src, bssid);
3110 if (bssid && ieee80211_has_tods(hdr->frame_control))
3111 ether_addr_copy(h_80211_dst, bssid);
3113 qc = ieee80211_get_qos_ctl(hdr);
3114 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3116 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3121 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3122 struct sta_info *sta,
3123 struct ieee80211_fast_tx *fast_tx,
3124 struct sk_buff *skb)
3126 struct ieee80211_local *local = sdata->local;
3127 struct fq *fq = &local->fq;
3129 struct fq_flow *flow;
3130 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3131 struct ieee80211_txq *txq = sta->sta.txq[tid];
3132 struct txq_info *txqi;
3133 struct sk_buff **frag_tail, *head;
3134 int subframe_len = skb->len - ETH_ALEN;
3135 u8 max_subframes = sta->sta.max_amsdu_subframes;
3136 int max_frags = local->hw.max_tx_fragments;
3137 int max_amsdu_len = sta->sta.max_amsdu_len;
3141 unsigned int orig_len;
3144 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3150 txqi = to_txq_info(txq);
3151 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3154 if (sta->sta.max_rc_amsdu_len)
3155 max_amsdu_len = min_t(int, max_amsdu_len,
3156 sta->sta.max_rc_amsdu_len);
3158 spin_lock_bh(&fq->lock);
3160 /* TODO: Ideally aggregation should be done on dequeue to remain
3161 * responsive to environment changes.
3165 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3166 head = skb_peek_tail(&flow->queue);
3170 orig_len = head->len;
3172 if (skb->len + head->len > max_amsdu_len)
3175 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3178 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3179 nfrags += 1 + skb_shinfo(head)->nr_frags;
3180 frag_tail = &skb_shinfo(head)->frag_list;
3181 while (*frag_tail) {
3182 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3183 frag_tail = &(*frag_tail)->next;
3187 if (max_subframes && n > max_subframes)
3190 if (max_frags && nfrags > max_frags)
3193 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3198 data = skb_push(skb, ETH_ALEN + 2);
3199 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3201 data += 2 * ETH_ALEN;
3202 len = cpu_to_be16(subframe_len);
3203 memcpy(data, &len, 2);
3204 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3206 head->len += skb->len;
3207 head->data_len += skb->len;
3210 flow->backlog += head->len - orig_len;
3211 tin->backlog_bytes += head->len - orig_len;
3213 fq_recalc_backlog(fq, tin, flow);
3216 spin_unlock_bh(&fq->lock);
3222 * Can be called while the sta lock is held. Anything that can cause packets to
3223 * be generated will cause deadlock!
3225 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3226 struct sta_info *sta, u8 pn_offs,
3227 struct ieee80211_key *key,
3228 struct sk_buff *skb)
3230 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3231 struct ieee80211_hdr *hdr = (void *)skb->data;
3232 u8 tid = IEEE80211_NUM_TIDS;
3235 info->control.hw_key = &key->conf;
3237 ieee80211_tx_stats(skb->dev, skb->len);
3239 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3240 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3241 *ieee80211_get_qos_ctl(hdr) = tid;
3242 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3244 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3245 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3246 sdata->sequence_number += 0x10;
3249 if (skb_shinfo(skb)->gso_size)
3250 sta->tx_stats.msdu[tid] +=
3251 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3253 sta->tx_stats.msdu[tid]++;
3255 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3257 /* statistics normally done by ieee80211_tx_h_stats (but that
3258 * has to consider fragmentation, so is more complex)
3260 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3261 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3265 u8 *crypto_hdr = skb->data + pn_offs;
3267 switch (key->conf.cipher) {
3268 case WLAN_CIPHER_SUITE_CCMP:
3269 case WLAN_CIPHER_SUITE_CCMP_256:
3270 case WLAN_CIPHER_SUITE_GCMP:
3271 case WLAN_CIPHER_SUITE_GCMP_256:
3272 pn = atomic64_inc_return(&key->conf.tx_pn);
3274 crypto_hdr[1] = pn >> 8;
3275 crypto_hdr[4] = pn >> 16;
3276 crypto_hdr[5] = pn >> 24;
3277 crypto_hdr[6] = pn >> 32;
3278 crypto_hdr[7] = pn >> 40;
3284 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3285 struct sta_info *sta,
3286 struct ieee80211_fast_tx *fast_tx,
3287 struct sk_buff *skb)
3289 struct ieee80211_local *local = sdata->local;
3290 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3291 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3292 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3294 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3295 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3296 struct ieee80211_tx_data tx;
3297 ieee80211_tx_result r;
3298 struct tid_ampdu_tx *tid_tx = NULL;
3299 u8 tid = IEEE80211_NUM_TIDS;
3301 /* control port protocol needs a lot of special handling */
3302 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3305 /* only RFC 1042 SNAP */
3306 if (ethertype < ETH_P_802_3_MIN)
3309 /* don't handle TX status request here either */
3310 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3313 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3314 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3315 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3317 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3319 if (tid_tx->timeout)
3320 tid_tx->last_tx = jiffies;
3324 /* after this point (skb is modified) we cannot return false */
3326 if (skb_shared(skb)) {
3327 struct sk_buff *tmp_skb = skb;
3329 skb = skb_clone(skb, GFP_ATOMIC);
3336 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3337 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3340 /* will not be crypto-handled beyond what we do here, so use false
3341 * as the may-encrypt argument for the resize to not account for
3342 * more room than we already have in 'extra_head'
3344 if (unlikely(ieee80211_skb_resize(sdata, skb,
3345 max_t(int, extra_head + hw_headroom -
3346 skb_headroom(skb), 0),
3352 memcpy(ð, skb->data, ETH_HLEN - 2);
3353 hdr = (void *)skb_push(skb, extra_head);
3354 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3355 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3356 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3358 memset(info, 0, sizeof(*info));
3359 info->band = fast_tx->band;
3360 info->control.vif = &sdata->vif;
3361 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3362 IEEE80211_TX_CTL_DONTFRAG |
3363 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3364 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3366 __skb_queue_head_init(&tx.skbs);
3368 tx.flags = IEEE80211_TX_UNICAST;
3372 tx.key = fast_tx->key;
3374 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3376 r = ieee80211_tx_h_rate_ctrl(&tx);
3380 if (r != TX_CONTINUE) {
3387 if (ieee80211_queue_skb(local, sdata, sta, skb))
3390 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3393 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3394 sdata = container_of(sdata->bss,
3395 struct ieee80211_sub_if_data, u.ap);
3397 __skb_queue_tail(&tx.skbs, skb);
3398 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3402 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3403 struct ieee80211_txq *txq)
3405 struct ieee80211_local *local = hw_to_local(hw);
3406 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3407 struct ieee80211_hdr *hdr;
3408 struct sk_buff *skb = NULL;
3409 struct fq *fq = &local->fq;
3410 struct fq_tin *tin = &txqi->tin;
3411 struct ieee80211_tx_info *info;
3412 struct ieee80211_tx_data tx;
3413 ieee80211_tx_result r;
3415 spin_lock_bh(&fq->lock);
3417 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3420 /* Make sure fragments stay together. */
3421 skb = __skb_dequeue(&txqi->frags);
3426 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3430 ieee80211_set_skb_vif(skb, txqi);
3432 hdr = (struct ieee80211_hdr *)skb->data;
3433 info = IEEE80211_SKB_CB(skb);
3435 memset(&tx, 0, sizeof(tx));
3436 __skb_queue_head_init(&tx.skbs);
3439 tx.sdata = vif_to_sdata(info->control.vif);
3442 tx.sta = container_of(txq->sta, struct sta_info, sta);
3445 * The key can be removed while the packet was queued, so need to call
3446 * this here to get the current key.
3448 r = ieee80211_tx_h_select_key(&tx);
3449 if (r != TX_CONTINUE) {
3450 ieee80211_free_txskb(&local->hw, skb);
3454 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3455 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3460 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3461 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3463 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3466 if (invoke_tx_handlers_late(&tx))
3469 skb = __skb_dequeue(&tx.skbs);
3471 if (!skb_queue_empty(&tx.skbs))
3472 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3475 if (skb && skb_has_frag_list(skb) &&
3476 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3477 if (skb_linearize(skb)) {
3478 ieee80211_free_txskb(&local->hw, skb);
3484 spin_unlock_bh(&fq->lock);
3488 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3490 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3491 struct net_device *dev,
3494 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3495 struct sta_info *sta;
3496 struct sk_buff *next;
3498 if (unlikely(skb->len < ETH_HLEN)) {
3505 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3508 if (!IS_ERR_OR_NULL(sta)) {
3509 struct ieee80211_fast_tx *fast_tx;
3511 fast_tx = rcu_dereference(sta->fast_tx);
3514 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3518 if (skb_is_gso(skb)) {
3519 struct sk_buff *segs;
3521 segs = skb_gso_segment(skb, 0);
3529 /* we cannot process non-linear frames on this path */
3530 if (skb_linearize(skb)) {
3535 /* the frame could be fragmented, software-encrypted, and other
3536 * things so we cannot really handle checksum offload with it -
3537 * fix it up in software before we handle anything else.
3539 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3540 skb_set_transport_header(skb,
3541 skb_checksum_start_offset(skb));
3542 if (skb_checksum_help(skb))
3555 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3559 ieee80211_tx_stats(dev, skb->len);
3561 ieee80211_xmit(sdata, sta, skb);
3571 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3572 * @skb: packet to be sent
3573 * @dev: incoming interface
3575 * On failure skb will be freed.
3577 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3578 struct net_device *dev)
3580 __ieee80211_subif_start_xmit(skb, dev, 0);
3581 return NETDEV_TX_OK;
3585 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3586 struct sk_buff *skb, u32 info_flags)
3588 struct ieee80211_hdr *hdr;
3589 struct ieee80211_tx_data tx = {
3590 .local = sdata->local,
3593 struct sta_info *sta;
3597 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3599 skb = ERR_PTR(-EINVAL);
3603 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3607 hdr = (void *)skb->data;
3608 tx.sta = sta_info_get(sdata, hdr->addr1);
3611 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3614 return ERR_PTR(-EINVAL);
3623 * ieee80211_clear_tx_pending may not be called in a context where
3624 * it is possible that it packets could come in again.
3626 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3628 struct sk_buff *skb;
3631 for (i = 0; i < local->hw.queues; i++) {
3632 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3633 ieee80211_free_txskb(&local->hw, skb);
3638 * Returns false if the frame couldn't be transmitted but was queued instead,
3639 * which in this case means re-queued -- take as an indication to stop sending
3640 * more pending frames.
3642 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3643 struct sk_buff *skb)
3645 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3646 struct ieee80211_sub_if_data *sdata;
3647 struct sta_info *sta;
3648 struct ieee80211_hdr *hdr;
3650 struct ieee80211_chanctx_conf *chanctx_conf;
3652 sdata = vif_to_sdata(info->control.vif);
3654 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3655 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3656 if (unlikely(!chanctx_conf)) {
3660 info->band = chanctx_conf->def.chan->band;
3661 result = ieee80211_tx(sdata, NULL, skb, true);
3663 struct sk_buff_head skbs;
3665 __skb_queue_head_init(&skbs);
3666 __skb_queue_tail(&skbs, skb);
3668 hdr = (struct ieee80211_hdr *)skb->data;
3669 sta = sta_info_get(sdata, hdr->addr1);
3671 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3678 * Transmit all pending packets. Called from tasklet.
3680 void ieee80211_tx_pending(unsigned long data)
3682 struct ieee80211_local *local = (struct ieee80211_local *)data;
3683 unsigned long flags;
3689 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3690 for (i = 0; i < local->hw.queues; i++) {
3692 * If queue is stopped by something other than due to pending
3693 * frames, or we have no pending frames, proceed to next queue.
3695 if (local->queue_stop_reasons[i] ||
3696 skb_queue_empty(&local->pending[i]))
3699 while (!skb_queue_empty(&local->pending[i])) {
3700 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3701 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3703 if (WARN_ON(!info->control.vif)) {
3704 ieee80211_free_txskb(&local->hw, skb);
3708 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3711 txok = ieee80211_tx_pending_skb(local, skb);
3712 spin_lock_irqsave(&local->queue_stop_reason_lock,
3718 if (skb_queue_empty(&local->pending[i]))
3719 ieee80211_propagate_queue_wake(local, i);
3721 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3726 /* functions for drivers to get certain frames */
3728 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3729 struct ps_data *ps, struct sk_buff *skb,
3734 int i, have_bits = 0, n1, n2;
3736 /* Generate bitmap for TIM only if there are any STAs in power save
3738 if (atomic_read(&ps->num_sta_ps) > 0)
3739 /* in the hope that this is faster than
3740 * checking byte-for-byte */
3741 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3742 IEEE80211_MAX_AID+1);
3744 if (ps->dtim_count == 0)
3745 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3750 tim = pos = (u8 *) skb_put(skb, 6);
3751 *pos++ = WLAN_EID_TIM;
3753 *pos++ = ps->dtim_count;
3754 *pos++ = sdata->vif.bss_conf.dtim_period;
3756 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3759 ps->dtim_bc_mc = aid0 == 1;
3762 /* Find largest even number N1 so that bits numbered 1 through
3763 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3764 * (N2 + 1) x 8 through 2007 are 0. */
3766 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3773 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3780 /* Bitmap control */
3782 /* Part Virt Bitmap */
3783 skb_put(skb, n2 - n1);
3784 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3786 tim[1] = n2 - n1 + 4;
3788 *pos++ = aid0; /* Bitmap control */
3789 *pos++ = 0; /* Part Virt Bitmap */
3793 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3794 struct ps_data *ps, struct sk_buff *skb,
3797 struct ieee80211_local *local = sdata->local;
3800 * Not very nice, but we want to allow the driver to call
3801 * ieee80211_beacon_get() as a response to the set_tim()
3802 * callback. That, however, is already invoked under the
3803 * sta_lock to guarantee consistent and race-free update
3804 * of the tim bitmap in mac80211 and the driver.
3806 if (local->tim_in_locked_section) {
3807 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3809 spin_lock_bh(&local->tim_lock);
3810 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3811 spin_unlock_bh(&local->tim_lock);
3817 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3818 struct beacon_data *beacon)
3820 struct probe_resp *resp;
3822 size_t beacon_data_len;
3824 u8 count = beacon->csa_current_counter;
3826 switch (sdata->vif.type) {
3827 case NL80211_IFTYPE_AP:
3828 beacon_data = beacon->tail;
3829 beacon_data_len = beacon->tail_len;
3831 case NL80211_IFTYPE_ADHOC:
3832 beacon_data = beacon->head;
3833 beacon_data_len = beacon->head_len;
3835 case NL80211_IFTYPE_MESH_POINT:
3836 beacon_data = beacon->head;
3837 beacon_data_len = beacon->head_len;
3844 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3845 resp = rcu_dereference(sdata->u.ap.probe_resp);
3847 if (beacon->csa_counter_offsets[i]) {
3848 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3854 beacon_data[beacon->csa_counter_offsets[i]] = count;
3857 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3858 resp->data[resp->csa_counter_offsets[i]] = count;
3863 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3865 beacon->csa_current_counter--;
3867 /* the counter should never reach 0 */
3868 WARN_ON_ONCE(!beacon->csa_current_counter);
3870 return beacon->csa_current_counter;
3873 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3875 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3876 struct beacon_data *beacon = NULL;
3881 if (sdata->vif.type == NL80211_IFTYPE_AP)
3882 beacon = rcu_dereference(sdata->u.ap.beacon);
3883 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3884 beacon = rcu_dereference(sdata->u.ibss.presp);
3885 else if (ieee80211_vif_is_mesh(&sdata->vif))
3886 beacon = rcu_dereference(sdata->u.mesh.beacon);
3891 count = __ieee80211_csa_update_counter(beacon);
3897 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3899 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3901 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3902 struct beacon_data *beacon = NULL;
3904 size_t beacon_data_len;
3907 if (!ieee80211_sdata_running(sdata))
3911 if (vif->type == NL80211_IFTYPE_AP) {
3912 struct ieee80211_if_ap *ap = &sdata->u.ap;
3914 beacon = rcu_dereference(ap->beacon);
3915 if (WARN_ON(!beacon || !beacon->tail))
3917 beacon_data = beacon->tail;
3918 beacon_data_len = beacon->tail_len;
3919 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3920 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3922 beacon = rcu_dereference(ifibss->presp);
3926 beacon_data = beacon->head;
3927 beacon_data_len = beacon->head_len;
3928 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3929 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3931 beacon = rcu_dereference(ifmsh->beacon);
3935 beacon_data = beacon->head;
3936 beacon_data_len = beacon->head_len;
3942 if (!beacon->csa_counter_offsets[0])
3945 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3948 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3955 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3957 static struct sk_buff *
3958 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3959 struct ieee80211_vif *vif,
3960 struct ieee80211_mutable_offsets *offs,
3963 struct ieee80211_local *local = hw_to_local(hw);
3964 struct beacon_data *beacon = NULL;
3965 struct sk_buff *skb = NULL;
3966 struct ieee80211_tx_info *info;
3967 struct ieee80211_sub_if_data *sdata = NULL;
3968 enum nl80211_band band;
3969 struct ieee80211_tx_rate_control txrc;
3970 struct ieee80211_chanctx_conf *chanctx_conf;
3971 int csa_off_base = 0;
3975 sdata = vif_to_sdata(vif);
3976 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3978 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3982 memset(offs, 0, sizeof(*offs));
3984 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3985 struct ieee80211_if_ap *ap = &sdata->u.ap;
3987 beacon = rcu_dereference(ap->beacon);
3989 if (beacon->csa_counter_offsets[0]) {
3991 __ieee80211_csa_update_counter(beacon);
3993 ieee80211_set_csa(sdata, beacon);
3997 * headroom, head length,
3998 * tail length and maximum TIM length
4000 skb = dev_alloc_skb(local->tx_headroom +
4002 beacon->tail_len + 256 +
4003 local->hw.extra_beacon_tailroom);
4007 skb_reserve(skb, local->tx_headroom);
4008 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4011 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4015 offs->tim_offset = beacon->head_len;
4016 offs->tim_length = skb->len - beacon->head_len;
4018 /* for AP the csa offsets are from tail */
4019 csa_off_base = skb->len;
4023 memcpy(skb_put(skb, beacon->tail_len),
4024 beacon->tail, beacon->tail_len);
4027 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4028 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4029 struct ieee80211_hdr *hdr;
4031 beacon = rcu_dereference(ifibss->presp);
4035 if (beacon->csa_counter_offsets[0]) {
4037 __ieee80211_csa_update_counter(beacon);
4039 ieee80211_set_csa(sdata, beacon);
4042 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4043 local->hw.extra_beacon_tailroom);
4046 skb_reserve(skb, local->tx_headroom);
4047 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4050 hdr = (struct ieee80211_hdr *) skb->data;
4051 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4052 IEEE80211_STYPE_BEACON);
4053 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4054 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4056 beacon = rcu_dereference(ifmsh->beacon);
4060 if (beacon->csa_counter_offsets[0]) {
4062 /* TODO: For mesh csa_counter is in TU, so
4063 * decrementing it by one isn't correct, but
4064 * for now we leave it consistent with overall
4065 * mac80211's behavior.
4067 __ieee80211_csa_update_counter(beacon);
4069 ieee80211_set_csa(sdata, beacon);
4072 if (ifmsh->sync_ops)
4073 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
4075 skb = dev_alloc_skb(local->tx_headroom +
4079 local->hw.extra_beacon_tailroom);
4082 skb_reserve(skb, local->tx_headroom);
4083 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4085 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4088 offs->tim_offset = beacon->head_len;
4089 offs->tim_length = skb->len - beacon->head_len;
4092 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
4100 if (offs && beacon) {
4103 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4104 u16 csa_off = beacon->csa_counter_offsets[i];
4109 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4113 band = chanctx_conf->def.chan->band;
4115 info = IEEE80211_SKB_CB(skb);
4117 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4118 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4121 memset(&txrc, 0, sizeof(txrc));
4123 txrc.sband = local->hw.wiphy->bands[band];
4124 txrc.bss_conf = &sdata->vif.bss_conf;
4126 txrc.reported_rate.idx = -1;
4127 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4128 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
4129 txrc.max_rate_idx = -1;
4131 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
4133 rate_control_get_rate(sdata, NULL, &txrc);
4135 info->control.vif = vif;
4137 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4138 IEEE80211_TX_CTL_ASSIGN_SEQ |
4139 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4147 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4148 struct ieee80211_vif *vif,
4149 struct ieee80211_mutable_offsets *offs)
4151 return __ieee80211_beacon_get(hw, vif, offs, true);
4153 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4155 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4156 struct ieee80211_vif *vif,
4157 u16 *tim_offset, u16 *tim_length)
4159 struct ieee80211_mutable_offsets offs = {};
4160 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4161 struct sk_buff *copy;
4162 struct ieee80211_supported_band *sband;
4169 *tim_offset = offs.tim_offset;
4172 *tim_length = offs.tim_length;
4174 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4175 !hw_to_local(hw)->monitors)
4178 /* send a copy to monitor interfaces */
4179 copy = skb_copy(bcn, GFP_ATOMIC);
4183 shift = ieee80211_vif_get_shift(vif);
4184 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
4185 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4189 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4191 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4192 struct ieee80211_vif *vif)
4194 struct ieee80211_if_ap *ap = NULL;
4195 struct sk_buff *skb = NULL;
4196 struct probe_resp *presp = NULL;
4197 struct ieee80211_hdr *hdr;
4198 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4200 if (sdata->vif.type != NL80211_IFTYPE_AP)
4206 presp = rcu_dereference(ap->probe_resp);
4210 skb = dev_alloc_skb(presp->len);
4214 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
4216 hdr = (struct ieee80211_hdr *) skb->data;
4217 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4223 EXPORT_SYMBOL(ieee80211_proberesp_get);
4225 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4226 struct ieee80211_vif *vif)
4228 struct ieee80211_sub_if_data *sdata;
4229 struct ieee80211_if_managed *ifmgd;
4230 struct ieee80211_pspoll *pspoll;
4231 struct ieee80211_local *local;
4232 struct sk_buff *skb;
4234 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4237 sdata = vif_to_sdata(vif);
4238 ifmgd = &sdata->u.mgd;
4239 local = sdata->local;
4241 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4245 skb_reserve(skb, local->hw.extra_tx_headroom);
4247 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
4248 memset(pspoll, 0, sizeof(*pspoll));
4249 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4250 IEEE80211_STYPE_PSPOLL);
4251 pspoll->aid = cpu_to_le16(ifmgd->aid);
4253 /* aid in PS-Poll has its two MSBs each set to 1 */
4254 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4256 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4257 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4261 EXPORT_SYMBOL(ieee80211_pspoll_get);
4263 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4264 struct ieee80211_vif *vif)
4266 struct ieee80211_hdr_3addr *nullfunc;
4267 struct ieee80211_sub_if_data *sdata;
4268 struct ieee80211_if_managed *ifmgd;
4269 struct ieee80211_local *local;
4270 struct sk_buff *skb;
4272 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4275 sdata = vif_to_sdata(vif);
4276 ifmgd = &sdata->u.mgd;
4277 local = sdata->local;
4279 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
4283 skb_reserve(skb, local->hw.extra_tx_headroom);
4285 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
4287 memset(nullfunc, 0, sizeof(*nullfunc));
4288 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4289 IEEE80211_STYPE_NULLFUNC |
4290 IEEE80211_FCTL_TODS);
4291 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4292 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4293 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4297 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4299 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4301 const u8 *ssid, size_t ssid_len,
4304 struct ieee80211_local *local = hw_to_local(hw);
4305 struct ieee80211_hdr_3addr *hdr;
4306 struct sk_buff *skb;
4310 ie_ssid_len = 2 + ssid_len;
4312 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4313 ie_ssid_len + tailroom);
4317 skb_reserve(skb, local->hw.extra_tx_headroom);
4319 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
4320 memset(hdr, 0, sizeof(*hdr));
4321 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4322 IEEE80211_STYPE_PROBE_REQ);
4323 eth_broadcast_addr(hdr->addr1);
4324 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4325 eth_broadcast_addr(hdr->addr3);
4327 pos = skb_put(skb, ie_ssid_len);
4328 *pos++ = WLAN_EID_SSID;
4331 memcpy(pos, ssid, ssid_len);
4336 EXPORT_SYMBOL(ieee80211_probereq_get);
4338 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4339 const void *frame, size_t frame_len,
4340 const struct ieee80211_tx_info *frame_txctl,
4341 struct ieee80211_rts *rts)
4343 const struct ieee80211_hdr *hdr = frame;
4345 rts->frame_control =
4346 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4347 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4349 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4350 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4352 EXPORT_SYMBOL(ieee80211_rts_get);
4354 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4355 const void *frame, size_t frame_len,
4356 const struct ieee80211_tx_info *frame_txctl,
4357 struct ieee80211_cts *cts)
4359 const struct ieee80211_hdr *hdr = frame;
4361 cts->frame_control =
4362 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4363 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4364 frame_len, frame_txctl);
4365 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4367 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4370 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4371 struct ieee80211_vif *vif)
4373 struct ieee80211_local *local = hw_to_local(hw);
4374 struct sk_buff *skb = NULL;
4375 struct ieee80211_tx_data tx;
4376 struct ieee80211_sub_if_data *sdata;
4378 struct ieee80211_tx_info *info;
4379 struct ieee80211_chanctx_conf *chanctx_conf;
4381 sdata = vif_to_sdata(vif);
4384 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4389 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4390 struct beacon_data *beacon =
4391 rcu_dereference(sdata->u.ap.beacon);
4393 if (!beacon || !beacon->head)
4396 ps = &sdata->u.ap.ps;
4397 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4398 ps = &sdata->u.mesh.ps;
4403 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4404 goto out; /* send buffered bc/mc only after DTIM beacon */
4407 skb = skb_dequeue(&ps->bc_buf);
4410 local->total_ps_buffered--;
4412 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4413 struct ieee80211_hdr *hdr =
4414 (struct ieee80211_hdr *) skb->data;
4415 /* more buffered multicast/broadcast frames ==> set
4416 * MoreData flag in IEEE 802.11 header to inform PS
4418 hdr->frame_control |=
4419 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4422 if (sdata->vif.type == NL80211_IFTYPE_AP)
4423 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4424 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4426 ieee80211_free_txskb(hw, skb);
4429 info = IEEE80211_SKB_CB(skb);
4431 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4432 info->band = chanctx_conf->def.chan->band;
4434 if (invoke_tx_handlers(&tx))
4441 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4443 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4445 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4446 struct ieee80211_sub_if_data *sdata = sta->sdata;
4447 struct ieee80211_local *local = sdata->local;
4451 lockdep_assert_held(&local->sta_mtx);
4453 /* only some cases are supported right now */
4454 switch (sdata->vif.type) {
4455 case NL80211_IFTYPE_STATION:
4456 case NL80211_IFTYPE_AP:
4457 case NL80211_IFTYPE_AP_VLAN:
4464 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4467 if (sta->reserved_tid == tid) {
4472 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4473 sdata_err(sdata, "TID reservation already active\n");
4478 ieee80211_stop_vif_queues(sdata->local, sdata,
4479 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4483 /* Tear down BA sessions so we stop aggregating on this TID */
4484 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4485 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4486 __ieee80211_stop_tx_ba_session(sta, tid,
4487 AGG_STOP_LOCAL_REQUEST);
4490 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4491 __ieee80211_flush_queues(local, sdata, queues, false);
4493 sta->reserved_tid = tid;
4495 ieee80211_wake_vif_queues(local, sdata,
4496 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4498 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4499 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4505 EXPORT_SYMBOL(ieee80211_reserve_tid);
4507 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4509 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4510 struct ieee80211_sub_if_data *sdata = sta->sdata;
4512 lockdep_assert_held(&sdata->local->sta_mtx);
4514 /* only some cases are supported right now */
4515 switch (sdata->vif.type) {
4516 case NL80211_IFTYPE_STATION:
4517 case NL80211_IFTYPE_AP:
4518 case NL80211_IFTYPE_AP_VLAN:
4525 if (tid != sta->reserved_tid) {
4526 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4530 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4532 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4534 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4535 struct sk_buff *skb, int tid,
4536 enum nl80211_band band)
4538 int ac = ieee802_1d_to_ac[tid & 7];
4540 skb_reset_mac_header(skb);
4541 skb_set_queue_mapping(skb, ac);
4542 skb->priority = tid;
4544 skb->dev = sdata->dev;
4547 * The other path calling ieee80211_xmit is from the tasklet,
4548 * and while we can handle concurrent transmissions locking
4549 * requirements are that we do not come into tx with bhs on.
4552 IEEE80211_SKB_CB(skb)->band = band;
4553 ieee80211_xmit(sdata, NULL, skb);