2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 * Transmit and frame generation functions.
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/bitmap.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <net/net_namespace.h>
24 #include <net/ieee80211_radiotap.h>
25 #include <net/cfg80211.h>
26 #include <net/mac80211.h>
27 #include <asm/unaligned.h>
29 #include "ieee80211_i.h"
30 #include "driver-ops.h"
40 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
42 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
44 u64_stats_update_begin(&tstats->syncp);
46 tstats->tx_bytes += len;
47 u64_stats_update_end(&tstats->syncp);
50 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
51 struct sk_buff *skb, int group_addr,
54 int rate, mrate, erp, dur, i, shift = 0;
55 struct ieee80211_rate *txrate;
56 struct ieee80211_local *local = tx->local;
57 struct ieee80211_supported_band *sband;
58 struct ieee80211_hdr *hdr;
59 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
60 struct ieee80211_chanctx_conf *chanctx_conf;
64 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
66 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
67 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
71 /* assume HW handles this */
72 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
76 if (WARN_ON_ONCE(tx->rate.idx < 0))
79 sband = local->hw.wiphy->bands[info->band];
80 txrate = &sband->bitrates[tx->rate.idx];
82 erp = txrate->flags & IEEE80211_RATE_ERP_G;
85 * data and mgmt (except PS Poll):
87 * - during contention period:
88 * if addr1 is group address: 0
89 * if more fragments = 0 and addr1 is individual address: time to
90 * transmit one ACK plus SIFS
91 * if more fragments = 1 and addr1 is individual address: time to
92 * transmit next fragment plus 2 x ACK plus 3 x SIFS
95 * - control response frame (CTS or ACK) shall be transmitted using the
96 * same rate as the immediately previous frame in the frame exchange
97 * sequence, if this rate belongs to the PHY mandatory rates, or else
98 * at the highest possible rate belonging to the PHY rates in the
101 hdr = (struct ieee80211_hdr *)skb->data;
102 if (ieee80211_is_ctl(hdr->frame_control)) {
103 /* TODO: These control frames are not currently sent by
104 * mac80211, but should they be implemented, this function
105 * needs to be updated to support duration field calculation.
107 * RTS: time needed to transmit pending data/mgmt frame plus
108 * one CTS frame plus one ACK frame plus 3 x SIFS
109 * CTS: duration of immediately previous RTS minus time
110 * required to transmit CTS and its SIFS
111 * ACK: 0 if immediately previous directed data/mgmt had
112 * more=0, with more=1 duration in ACK frame is duration
113 * from previous frame minus time needed to transmit ACK
115 * PS Poll: BIT(15) | BIT(14) | aid
121 if (0 /* FIX: data/mgmt during CFP */)
122 return cpu_to_le16(32768);
124 if (group_addr) /* Group address as the destination - no ACK */
127 /* Individual destination address:
128 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
129 * CTS and ACK frames shall be transmitted using the highest rate in
130 * basic rate set that is less than or equal to the rate of the
131 * immediately previous frame and that is using the same modulation
132 * (CCK or OFDM). If no basic rate set matches with these requirements,
133 * the highest mandatory rate of the PHY that is less than or equal to
134 * the rate of the previous frame is used.
135 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
138 /* use lowest available if everything fails */
139 mrate = sband->bitrates[0].bitrate;
140 for (i = 0; i < sband->n_bitrates; i++) {
141 struct ieee80211_rate *r = &sband->bitrates[i];
143 if (r->bitrate > txrate->bitrate)
146 if ((rate_flags & r->flags) != rate_flags)
149 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
150 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
152 switch (sband->band) {
153 case IEEE80211_BAND_2GHZ: {
155 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
156 flag = IEEE80211_RATE_MANDATORY_G;
158 flag = IEEE80211_RATE_MANDATORY_B;
163 case IEEE80211_BAND_5GHZ:
164 if (r->flags & IEEE80211_RATE_MANDATORY_A)
167 case IEEE80211_BAND_60GHZ:
168 /* TODO, for now fall through */
169 case IEEE80211_NUM_BANDS:
175 /* No matching basic rate found; use highest suitable mandatory
177 rate = DIV_ROUND_UP(mrate, 1 << shift);
180 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
181 if (ieee80211_is_data_qos(hdr->frame_control) &&
182 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
185 /* Time needed to transmit ACK
186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
187 * to closest integer */
188 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
189 tx->sdata->vif.bss_conf.use_short_preamble,
193 /* Frame is fragmented: duration increases with time needed to
194 * transmit next fragment plus ACK and 2 x SIFS. */
195 dur *= 2; /* ACK + SIFS */
197 dur += ieee80211_frame_duration(sband->band, next_frag_len,
198 txrate->bitrate, erp,
199 tx->sdata->vif.bss_conf.use_short_preamble,
203 return cpu_to_le16(dur);
207 static ieee80211_tx_result debug_noinline
208 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
210 struct ieee80211_local *local = tx->local;
211 struct ieee80211_if_managed *ifmgd;
213 /* driver doesn't support power save */
214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
217 /* hardware does dynamic power save */
218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
221 /* dynamic power save disabled */
222 if (local->hw.conf.dynamic_ps_timeout <= 0)
225 /* we are scanning, don't enable power save */
229 if (!local->ps_sdata)
232 /* No point if we're going to suspend */
233 if (local->quiescing)
236 /* dynamic ps is supported only in managed mode */
237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
240 ifmgd = &tx->sdata->u.mgd;
243 * Don't wakeup from power save if u-apsd is enabled, voip ac has
244 * u-apsd enabled and the frame is in voip class. This effectively
245 * means that even if all access categories have u-apsd enabled, in
246 * practise u-apsd is only used with the voip ac. This is a
247 * workaround for the case when received voip class packets do not
248 * have correct qos tag for some reason, due the network or the
251 * Note: ifmgd->uapsd_queues access is racy here. If the value is
252 * changed via debugfs, user needs to reassociate manually to have
253 * everything in sync.
255 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
256 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
257 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
260 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
261 ieee80211_stop_queues_by_reason(&local->hw,
262 IEEE80211_MAX_QUEUE_MAP,
263 IEEE80211_QUEUE_STOP_REASON_PS,
265 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
266 ieee80211_queue_work(&local->hw,
267 &local->dynamic_ps_disable_work);
270 /* Don't restart the timer if we're not disassociated */
271 if (!ifmgd->associated)
274 mod_timer(&local->dynamic_ps_timer, jiffies +
275 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
280 static ieee80211_tx_result debug_noinline
281 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
288 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
291 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
292 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
293 !ieee80211_is_probe_req(hdr->frame_control) &&
294 !ieee80211_is_nullfunc(hdr->frame_control))
296 * When software scanning only nullfunc frames (to notify
297 * the sleep state to the AP) and probe requests (for the
298 * active scan) are allowed, all other frames should not be
299 * sent and we should not get here, but if we do
300 * nonetheless, drop them to avoid sending them
301 * off-channel. See the link below and
302 * ieee80211_start_scan() for more.
304 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
308 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
311 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
314 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
321 if (unlikely(!assoc &&
322 ieee80211_is_data(hdr->frame_control))) {
323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
324 sdata_info(tx->sdata,
325 "dropped data frame to not associated station %pM\n",
328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
331 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
332 ieee80211_is_data(hdr->frame_control) &&
333 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
335 * No associated STAs - no need to send multicast
344 /* This function is called whenever the AP is about to exceed the maximum limit
345 * of buffered frames for power saving STAs. This situation should not really
346 * happen often during normal operation, so dropping the oldest buffered packet
347 * from each queue should be OK to make some room for new frames. */
348 static void purge_old_ps_buffers(struct ieee80211_local *local)
350 int total = 0, purged = 0;
352 struct ieee80211_sub_if_data *sdata;
353 struct sta_info *sta;
355 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
358 if (sdata->vif.type == NL80211_IFTYPE_AP)
359 ps = &sdata->u.ap.ps;
360 else if (ieee80211_vif_is_mesh(&sdata->vif))
361 ps = &sdata->u.mesh.ps;
365 skb = skb_dequeue(&ps->bc_buf);
370 total += skb_queue_len(&ps->bc_buf);
374 * Drop one frame from each station from the lowest-priority
375 * AC that has frames at all.
377 list_for_each_entry_rcu(sta, &local->sta_list, list) {
380 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
381 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
382 total += skb_queue_len(&sta->ps_tx_buf[ac]);
385 ieee80211_free_txskb(&local->hw, skb);
391 local->total_ps_buffered = total;
392 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
395 static ieee80211_tx_result
396 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
398 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
399 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
403 * broadcast/multicast frame
405 * If any of the associated/peer stations is in power save mode,
406 * the frame is buffered to be sent after DTIM beacon frame.
407 * This is done either by the hardware or us.
410 /* powersaving STAs currently only in AP/VLAN/mesh mode */
411 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
412 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
416 ps = &tx->sdata->bss->ps;
417 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
418 ps = &tx->sdata->u.mesh.ps;
424 /* no buffering for ordered frames */
425 if (ieee80211_has_order(hdr->frame_control))
428 if (ieee80211_is_probe_req(hdr->frame_control))
431 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
432 info->hw_queue = tx->sdata->vif.cab_queue;
434 /* no stations in PS mode */
435 if (!atomic_read(&ps->num_sta_ps))
438 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
440 /* device releases frame after DTIM beacon */
441 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
444 /* buffered in mac80211 */
445 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
446 purge_old_ps_buffers(tx->local);
448 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
450 "BC TX buffer full - dropping the oldest frame\n");
451 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
453 tx->local->total_ps_buffered++;
455 skb_queue_tail(&ps->bc_buf, tx->skb);
460 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
463 if (!ieee80211_is_mgmt(fc))
466 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
469 if (!ieee80211_is_robust_mgmt_frame(skb))
475 static ieee80211_tx_result
476 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
478 struct sta_info *sta = tx->sta;
479 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
481 struct ieee80211_local *local = tx->local;
486 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
487 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
488 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
489 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
490 int ac = skb_get_queue_mapping(tx->skb);
492 if (ieee80211_is_mgmt(hdr->frame_control) &&
493 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
494 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
498 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
499 sta->sta.addr, sta->sta.aid, ac);
500 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
501 purge_old_ps_buffers(tx->local);
503 /* sync with ieee80211_sta_ps_deliver_wakeup */
504 spin_lock(&sta->ps_lock);
506 * STA woke up the meantime and all the frames on ps_tx_buf have
507 * been queued to pending queue. No reordering can happen, go
508 * ahead and Tx the packet.
510 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
511 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
512 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
513 spin_unlock(&sta->ps_lock);
517 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
518 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
520 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
522 ieee80211_free_txskb(&local->hw, old);
524 tx->local->total_ps_buffered++;
526 info->control.jiffies = jiffies;
527 info->control.vif = &tx->sdata->vif;
528 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
529 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
530 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
531 spin_unlock(&sta->ps_lock);
533 if (!timer_pending(&local->sta_cleanup))
534 mod_timer(&local->sta_cleanup,
535 round_jiffies(jiffies +
536 STA_INFO_CLEANUP_INTERVAL));
539 * We queued up some frames, so the TIM bit might
540 * need to be set, recalculate it.
542 sta_info_recalc_tim(sta);
545 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
547 "STA %pM in PS mode, but polling/in SP -> send frame\n",
554 static ieee80211_tx_result debug_noinline
555 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
557 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
560 if (tx->flags & IEEE80211_TX_UNICAST)
561 return ieee80211_tx_h_unicast_ps_buf(tx);
563 return ieee80211_tx_h_multicast_ps_buf(tx);
566 static ieee80211_tx_result debug_noinline
567 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
569 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
571 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
572 if (tx->sdata->control_port_no_encrypt)
573 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
574 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
575 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
581 static ieee80211_tx_result debug_noinline
582 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
584 struct ieee80211_key *key;
585 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
586 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
588 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
591 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
593 else if (ieee80211_is_mgmt(hdr->frame_control) &&
594 is_multicast_ether_addr(hdr->addr1) &&
595 ieee80211_is_robust_mgmt_frame(tx->skb) &&
596 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
598 else if (is_multicast_ether_addr(hdr->addr1) &&
599 (key = rcu_dereference(tx->sdata->default_multicast_key)))
601 else if (!is_multicast_ether_addr(hdr->addr1) &&
602 (key = rcu_dereference(tx->sdata->default_unicast_key)))
608 bool skip_hw = false;
610 /* TODO: add threshold stuff again */
612 switch (tx->key->conf.cipher) {
613 case WLAN_CIPHER_SUITE_WEP40:
614 case WLAN_CIPHER_SUITE_WEP104:
615 case WLAN_CIPHER_SUITE_TKIP:
616 if (!ieee80211_is_data_present(hdr->frame_control))
619 case WLAN_CIPHER_SUITE_CCMP:
620 case WLAN_CIPHER_SUITE_CCMP_256:
621 case WLAN_CIPHER_SUITE_GCMP:
622 case WLAN_CIPHER_SUITE_GCMP_256:
623 if (!ieee80211_is_data_present(hdr->frame_control) &&
624 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
628 skip_hw = (tx->key->conf.flags &
629 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
630 ieee80211_is_mgmt(hdr->frame_control);
632 case WLAN_CIPHER_SUITE_AES_CMAC:
633 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
634 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
635 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
636 if (!ieee80211_is_mgmt(hdr->frame_control))
641 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
642 !ieee80211_is_deauth(hdr->frame_control)))
645 if (!skip_hw && tx->key &&
646 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
647 info->control.hw_key = &tx->key->conf;
653 static ieee80211_tx_result debug_noinline
654 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
656 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
657 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
658 struct ieee80211_supported_band *sband;
660 struct ieee80211_tx_rate_control txrc;
661 struct ieee80211_sta_rates *ratetbl = NULL;
664 memset(&txrc, 0, sizeof(txrc));
666 sband = tx->local->hw.wiphy->bands[info->band];
668 len = min_t(u32, tx->skb->len + FCS_LEN,
669 tx->local->hw.wiphy->frag_threshold);
671 /* set up the tx rate control struct we give the RC algo */
672 txrc.hw = &tx->local->hw;
674 txrc.bss_conf = &tx->sdata->vif.bss_conf;
676 txrc.reported_rate.idx = -1;
677 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
678 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
679 txrc.max_rate_idx = -1;
681 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
683 if (tx->sdata->rc_has_mcs_mask[info->band])
684 txrc.rate_idx_mcs_mask =
685 tx->sdata->rc_rateidx_mcs_mask[info->band];
687 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
688 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
689 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
691 /* set up RTS protection if desired */
692 if (len > tx->local->hw.wiphy->rts_threshold) {
696 info->control.use_rts = txrc.rts;
697 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
700 * Use short preamble if the BSS can handle it, but not for
701 * management frames unless we know the receiver can handle
702 * that -- the management frame might be to a station that
703 * just wants a probe response.
705 if (tx->sdata->vif.bss_conf.use_short_preamble &&
706 (ieee80211_is_data(hdr->frame_control) ||
707 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
708 txrc.short_preamble = true;
710 info->control.short_preamble = txrc.short_preamble;
713 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
716 * Lets not bother rate control if we're associated and cannot
717 * talk to the sta. This should not happen.
719 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
720 !rate_usable_index_exists(sband, &tx->sta->sta),
721 "%s: Dropped data frame as no usable bitrate found while "
722 "scanning and associated. Target station: "
723 "%pM on %d GHz band\n",
724 tx->sdata->name, hdr->addr1,
729 * If we're associated with the sta at this point we know we can at
730 * least send the frame at the lowest bit rate.
732 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
734 if (tx->sta && !info->control.skip_table)
735 ratetbl = rcu_dereference(tx->sta->sta.rates);
737 if (unlikely(info->control.rates[0].idx < 0)) {
739 struct ieee80211_tx_rate rate = {
740 .idx = ratetbl->rate[0].idx,
741 .flags = ratetbl->rate[0].flags,
742 .count = ratetbl->rate[0].count
745 if (ratetbl->rate[0].idx < 0)
753 tx->rate = info->control.rates[0];
756 if (txrc.reported_rate.idx < 0) {
757 txrc.reported_rate = tx->rate;
758 if (tx->sta && ieee80211_is_data(hdr->frame_control))
759 tx->sta->last_tx_rate = txrc.reported_rate;
761 tx->sta->last_tx_rate = txrc.reported_rate;
766 if (unlikely(!info->control.rates[0].count))
767 info->control.rates[0].count = 1;
769 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
770 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
771 info->control.rates[0].count = 1;
776 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
778 u16 *seq = &sta->tid_seq[tid];
779 __le16 ret = cpu_to_le16(*seq);
781 /* Increase the sequence number. */
782 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
787 static ieee80211_tx_result debug_noinline
788 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
790 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
791 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
796 * Packet injection may want to control the sequence
797 * number, if we have no matching interface then we
798 * neither assign one ourselves nor ask the driver to.
800 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
803 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
806 if (ieee80211_hdrlen(hdr->frame_control) < 24)
809 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
813 * Anything but QoS data that has a sequence number field
814 * (is long enough) gets a sequence number from the global
815 * counter. QoS data frames with a multicast destination
816 * also use the global counter (802.11-2012 9.3.2.10).
818 if (!ieee80211_is_data_qos(hdr->frame_control) ||
819 is_multicast_ether_addr(hdr->addr1)) {
820 /* driver should assign sequence number */
821 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
822 /* for pure STA mode without beacons, we can do it */
823 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
824 tx->sdata->sequence_number += 0x10;
826 tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++;
831 * This should be true for injected/management frames only, for
832 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
833 * above since they are not QoS-data frames.
838 /* include per-STA, per-TID sequence counter */
840 qc = ieee80211_get_qos_ctl(hdr);
841 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
842 tx->sta->tx_msdu[tid]++;
844 if (!tx->sta->sta.txq[0])
845 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
850 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
851 struct sk_buff *skb, int hdrlen,
854 struct ieee80211_local *local = tx->local;
855 struct ieee80211_tx_info *info;
857 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
858 int pos = hdrlen + per_fragm;
859 int rem = skb->len - hdrlen - per_fragm;
861 if (WARN_ON(rem < 0))
864 /* first fragment was already added to queue by caller */
867 int fraglen = per_fragm;
872 tmp = dev_alloc_skb(local->tx_headroom +
874 tx->sdata->encrypt_headroom +
875 IEEE80211_ENCRYPT_TAILROOM);
879 __skb_queue_tail(&tx->skbs, tmp);
882 local->tx_headroom + tx->sdata->encrypt_headroom);
884 /* copy control information */
885 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
887 info = IEEE80211_SKB_CB(tmp);
888 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
889 IEEE80211_TX_CTL_FIRST_FRAGMENT);
892 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
894 skb_copy_queue_mapping(tmp, skb);
895 tmp->priority = skb->priority;
898 /* copy header and data */
899 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
900 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
905 /* adjust first fragment's length */
906 skb_trim(skb, hdrlen + per_fragm);
910 static ieee80211_tx_result debug_noinline
911 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
913 struct sk_buff *skb = tx->skb;
914 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
915 struct ieee80211_hdr *hdr = (void *)skb->data;
916 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
920 /* no matter what happens, tx->skb moves to tx->skbs */
921 __skb_queue_tail(&tx->skbs, skb);
924 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
927 if (tx->local->ops->set_frag_threshold)
931 * Warn when submitting a fragmented A-MPDU frame and drop it.
932 * This scenario is handled in ieee80211_tx_prepare but extra
933 * caution taken here as fragmented ampdu may cause Tx stop.
935 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
938 hdrlen = ieee80211_hdrlen(hdr->frame_control);
940 /* internal error, why isn't DONTFRAG set? */
941 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
945 * Now fragment the frame. This will allocate all the fragments and
946 * chain them (using skb as the first fragment) to skb->next.
947 * During transmission, we will remove the successfully transmitted
948 * fragments from this list. When the low-level driver rejects one
949 * of the fragments then we will simply pretend to accept the skb
950 * but store it away as pending.
952 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
955 /* update duration/seq/flags of fragments */
958 skb_queue_walk(&tx->skbs, skb) {
959 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
961 hdr = (void *)skb->data;
962 info = IEEE80211_SKB_CB(skb);
964 if (!skb_queue_is_last(&tx->skbs, skb)) {
965 hdr->frame_control |= morefrags;
967 * No multi-rate retries for fragmented frames, that
968 * would completely throw off the NAV at other STAs.
970 info->control.rates[1].idx = -1;
971 info->control.rates[2].idx = -1;
972 info->control.rates[3].idx = -1;
973 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
974 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
976 hdr->frame_control &= ~morefrags;
978 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
985 static ieee80211_tx_result debug_noinline
986 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
994 skb_queue_walk(&tx->skbs, skb) {
995 ac = skb_get_queue_mapping(skb);
996 tx->sta->tx_bytes[ac] += skb->len;
999 tx->sta->tx_packets[ac]++;
1004 static ieee80211_tx_result debug_noinline
1005 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1010 switch (tx->key->conf.cipher) {
1011 case WLAN_CIPHER_SUITE_WEP40:
1012 case WLAN_CIPHER_SUITE_WEP104:
1013 return ieee80211_crypto_wep_encrypt(tx);
1014 case WLAN_CIPHER_SUITE_TKIP:
1015 return ieee80211_crypto_tkip_encrypt(tx);
1016 case WLAN_CIPHER_SUITE_CCMP:
1017 return ieee80211_crypto_ccmp_encrypt(
1018 tx, IEEE80211_CCMP_MIC_LEN);
1019 case WLAN_CIPHER_SUITE_CCMP_256:
1020 return ieee80211_crypto_ccmp_encrypt(
1021 tx, IEEE80211_CCMP_256_MIC_LEN);
1022 case WLAN_CIPHER_SUITE_AES_CMAC:
1023 return ieee80211_crypto_aes_cmac_encrypt(tx);
1024 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1025 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1026 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1027 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1028 return ieee80211_crypto_aes_gmac_encrypt(tx);
1029 case WLAN_CIPHER_SUITE_GCMP:
1030 case WLAN_CIPHER_SUITE_GCMP_256:
1031 return ieee80211_crypto_gcmp_encrypt(tx);
1033 return ieee80211_crypto_hw_encrypt(tx);
1039 static ieee80211_tx_result debug_noinline
1040 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1042 struct sk_buff *skb;
1043 struct ieee80211_hdr *hdr;
1047 skb_queue_walk(&tx->skbs, skb) {
1048 hdr = (void *) skb->data;
1049 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1050 break; /* must not overwrite AID */
1051 if (!skb_queue_is_last(&tx->skbs, skb)) {
1052 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1053 next_len = next->len;
1056 group_addr = is_multicast_ether_addr(hdr->addr1);
1059 ieee80211_duration(tx, skb, group_addr, next_len);
1065 /* actual transmit path */
1067 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1068 struct sk_buff *skb,
1069 struct ieee80211_tx_info *info,
1070 struct tid_ampdu_tx *tid_tx,
1073 bool queued = false;
1074 bool reset_agg_timer = false;
1075 struct sk_buff *purge_skb = NULL;
1077 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1078 info->flags |= IEEE80211_TX_CTL_AMPDU;
1079 reset_agg_timer = true;
1080 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1082 * nothing -- this aggregation session is being started
1083 * but that might still fail with the driver
1085 } else if (!tx->sta->sta.txq[tid]) {
1086 spin_lock(&tx->sta->lock);
1088 * Need to re-check now, because we may get here
1090 * 1) in the window during which the setup is actually
1091 * already done, but not marked yet because not all
1092 * packets are spliced over to the driver pending
1093 * queue yet -- if this happened we acquire the lock
1094 * either before or after the splice happens, but
1095 * need to recheck which of these cases happened.
1097 * 2) during session teardown, if the OPERATIONAL bit
1098 * was cleared due to the teardown but the pointer
1099 * hasn't been assigned NULL yet (or we loaded it
1100 * before it was assigned) -- in this case it may
1101 * now be NULL which means we should just let the
1102 * packet pass through because splicing the frames
1103 * back is already done.
1105 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1108 /* do nothing, let packet pass through */
1109 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1110 info->flags |= IEEE80211_TX_CTL_AMPDU;
1111 reset_agg_timer = true;
1114 info->control.vif = &tx->sdata->vif;
1115 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1116 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1117 __skb_queue_tail(&tid_tx->pending, skb);
1118 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1119 purge_skb = __skb_dequeue(&tid_tx->pending);
1121 spin_unlock(&tx->sta->lock);
1124 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1127 /* reset session timer */
1128 if (reset_agg_timer && tid_tx->timeout)
1129 tid_tx->last_tx = jiffies;
1136 * pass %NULL for the station if unknown, a valid pointer if known
1137 * or an ERR_PTR() if the station is known not to exist
1139 static ieee80211_tx_result
1140 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1141 struct ieee80211_tx_data *tx,
1142 struct sta_info *sta, struct sk_buff *skb)
1144 struct ieee80211_local *local = sdata->local;
1145 struct ieee80211_hdr *hdr;
1146 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1150 memset(tx, 0, sizeof(*tx));
1154 __skb_queue_head_init(&tx->skbs);
1157 * If this flag is set to true anywhere, and we get here,
1158 * we are doing the needed processing, so remove the flag
1161 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1163 hdr = (struct ieee80211_hdr *) skb->data;
1169 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1170 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1171 if (!tx->sta && sdata->wdev.use_4addr)
1173 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1174 IEEE80211_TX_CTL_INJECTED) ||
1175 tx->sdata->control_port_protocol == tx->skb->protocol) {
1176 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1178 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1179 tx->sta = sta_info_get(sdata, hdr->addr1);
1182 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1183 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1184 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1185 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1186 struct tid_ampdu_tx *tid_tx;
1188 qc = ieee80211_get_qos_ctl(hdr);
1189 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1191 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1195 queued = ieee80211_tx_prep_agg(tx, skb, info,
1198 if (unlikely(queued))
1203 if (is_multicast_ether_addr(hdr->addr1)) {
1204 tx->flags &= ~IEEE80211_TX_UNICAST;
1205 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1207 tx->flags |= IEEE80211_TX_UNICAST;
1209 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1210 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1211 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1212 info->flags & IEEE80211_TX_CTL_AMPDU)
1213 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1217 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1218 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1219 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1221 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1226 static void ieee80211_drv_tx(struct ieee80211_local *local,
1227 struct ieee80211_vif *vif,
1228 struct ieee80211_sta *pubsta,
1229 struct sk_buff *skb)
1231 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1232 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1233 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1234 struct ieee80211_tx_control control = {
1237 struct ieee80211_txq *txq = NULL;
1238 struct txq_info *txqi;
1241 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)
1244 if (!ieee80211_is_data(hdr->frame_control))
1248 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1250 txq = pubsta->txq[tid];
1259 txqi = to_txq_info(txq);
1260 atomic_inc(&sdata->txqs_len[ac]);
1261 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)
1262 netif_stop_subqueue(sdata->dev, ac);
1264 skb_queue_tail(&txqi->queue, skb);
1265 drv_wake_tx_queue(local, txqi);
1270 drv_tx(local, &control, skb);
1273 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
1274 struct ieee80211_txq *txq)
1276 struct ieee80211_local *local = hw_to_local(hw);
1277 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
1278 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
1279 struct ieee80211_hdr *hdr;
1280 struct sk_buff *skb = NULL;
1283 spin_lock_bh(&txqi->queue.lock);
1285 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
1288 skb = __skb_dequeue(&txqi->queue);
1292 atomic_dec(&sdata->txqs_len[ac]);
1293 if (__netif_subqueue_stopped(sdata->dev, ac))
1294 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);
1296 hdr = (struct ieee80211_hdr *)skb->data;
1297 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1298 struct sta_info *sta = container_of(txq->sta, struct sta_info,
1300 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1302 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
1303 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
1304 info->flags |= IEEE80211_TX_CTL_AMPDU;
1306 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1310 spin_unlock_bh(&txqi->queue.lock);
1314 EXPORT_SYMBOL(ieee80211_tx_dequeue);
1316 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1317 struct ieee80211_vif *vif,
1318 struct ieee80211_sta *sta,
1319 struct sk_buff_head *skbs,
1322 struct sk_buff *skb, *tmp;
1323 unsigned long flags;
1325 skb_queue_walk_safe(skbs, skb, tmp) {
1326 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1327 int q = info->hw_queue;
1329 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1330 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1331 __skb_unlink(skb, skbs);
1332 ieee80211_free_txskb(&local->hw, skb);
1337 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1338 if (local->queue_stop_reasons[q] ||
1339 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1340 if (unlikely(info->flags &
1341 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1342 if (local->queue_stop_reasons[q] &
1343 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1345 * Drop off-channel frames if queues
1346 * are stopped for any reason other
1347 * than off-channel operation. Never
1350 spin_unlock_irqrestore(
1351 &local->queue_stop_reason_lock,
1353 ieee80211_purge_tx_queue(&local->hw,
1360 * Since queue is stopped, queue up frames for
1361 * later transmission from the tx-pending
1362 * tasklet when the queue is woken again.
1365 skb_queue_splice_init(skbs,
1366 &local->pending[q]);
1368 skb_queue_splice_tail_init(skbs,
1369 &local->pending[q]);
1371 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1376 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1378 info->control.vif = vif;
1380 __skb_unlink(skb, skbs);
1381 ieee80211_drv_tx(local, vif, sta, skb);
1388 * Returns false if the frame couldn't be transmitted but was queued instead.
1390 static bool __ieee80211_tx(struct ieee80211_local *local,
1391 struct sk_buff_head *skbs, int led_len,
1392 struct sta_info *sta, bool txpending)
1394 struct ieee80211_tx_info *info;
1395 struct ieee80211_sub_if_data *sdata;
1396 struct ieee80211_vif *vif;
1397 struct ieee80211_sta *pubsta;
1398 struct sk_buff *skb;
1402 if (WARN_ON(skb_queue_empty(skbs)))
1405 skb = skb_peek(skbs);
1406 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1407 info = IEEE80211_SKB_CB(skb);
1408 sdata = vif_to_sdata(info->control.vif);
1409 if (sta && !sta->uploaded)
1417 switch (sdata->vif.type) {
1418 case NL80211_IFTYPE_MONITOR:
1419 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1423 sdata = rcu_dereference(local->monitor_sdata);
1427 vif->hw_queue[skb_get_queue_mapping(skb)];
1428 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1434 case NL80211_IFTYPE_AP_VLAN:
1435 sdata = container_of(sdata->bss,
1436 struct ieee80211_sub_if_data, u.ap);
1443 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1446 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1448 WARN_ON_ONCE(!skb_queue_empty(skbs));
1454 * Invoke TX handlers, return 0 on success and non-zero if the
1455 * frame was dropped or queued.
1457 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1459 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1460 ieee80211_tx_result res = TX_DROP;
1462 #define CALL_TXH(txh) \
1465 if (res != TX_CONTINUE) \
1469 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1470 CALL_TXH(ieee80211_tx_h_check_assoc);
1471 CALL_TXH(ieee80211_tx_h_ps_buf);
1472 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1473 CALL_TXH(ieee80211_tx_h_select_key);
1474 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1475 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1477 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1478 __skb_queue_tail(&tx->skbs, tx->skb);
1483 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1484 CALL_TXH(ieee80211_tx_h_sequence);
1485 CALL_TXH(ieee80211_tx_h_fragment);
1486 /* handlers after fragment must be aware of tx info fragmentation! */
1487 CALL_TXH(ieee80211_tx_h_stats);
1488 CALL_TXH(ieee80211_tx_h_encrypt);
1489 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1490 CALL_TXH(ieee80211_tx_h_calculate_duration);
1494 if (unlikely(res == TX_DROP)) {
1495 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1497 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1499 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1501 } else if (unlikely(res == TX_QUEUED)) {
1502 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1509 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1510 struct ieee80211_vif *vif, struct sk_buff *skb,
1511 int band, struct ieee80211_sta **sta)
1513 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1514 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1515 struct ieee80211_tx_data tx;
1516 struct sk_buff *skb2;
1518 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1522 info->control.vif = vif;
1523 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1525 if (invoke_tx_handlers(&tx))
1530 *sta = &tx.sta->sta;
1535 /* this function isn't suitable for fragmented data frames */
1536 skb2 = __skb_dequeue(&tx.skbs);
1537 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1538 ieee80211_free_txskb(hw, skb2);
1539 ieee80211_purge_tx_queue(hw, &tx.skbs);
1545 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1548 * Returns false if the frame couldn't be transmitted but was queued instead.
1550 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1551 struct sta_info *sta, struct sk_buff *skb,
1554 struct ieee80211_local *local = sdata->local;
1555 struct ieee80211_tx_data tx;
1556 ieee80211_tx_result res_prepare;
1557 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1561 if (unlikely(skb->len < 10)) {
1566 /* initialises tx */
1568 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1570 if (unlikely(res_prepare == TX_DROP)) {
1571 ieee80211_free_txskb(&local->hw, skb);
1573 } else if (unlikely(res_prepare == TX_QUEUED)) {
1577 /* set up hw_queue value early */
1578 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1579 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1581 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1583 if (!invoke_tx_handlers(&tx))
1584 result = __ieee80211_tx(local, &tx.skbs, led_len,
1590 /* device xmit handlers */
1592 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1593 struct sk_buff *skb,
1594 int head_need, bool may_encrypt)
1596 struct ieee80211_local *local = sdata->local;
1599 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1600 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1601 tail_need -= skb_tailroom(skb);
1602 tail_need = max_t(int, tail_need, 0);
1605 if (skb_cloned(skb) &&
1606 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1607 !skb_clone_writable(skb, ETH_HLEN) ||
1608 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1609 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1610 else if (head_need || tail_need)
1611 I802_DEBUG_INC(local->tx_expand_skb_head);
1615 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1616 wiphy_debug(local->hw.wiphy,
1617 "failed to reallocate TX buffer\n");
1624 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1625 struct sta_info *sta, struct sk_buff *skb)
1627 struct ieee80211_local *local = sdata->local;
1628 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1629 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1633 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1635 headroom = local->tx_headroom;
1637 headroom += sdata->encrypt_headroom;
1638 headroom -= skb_headroom(skb);
1639 headroom = max_t(int, 0, headroom);
1641 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1642 ieee80211_free_txskb(&local->hw, skb);
1646 hdr = (struct ieee80211_hdr *) skb->data;
1647 info->control.vif = &sdata->vif;
1649 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1650 if (ieee80211_is_data(hdr->frame_control) &&
1651 is_unicast_ether_addr(hdr->addr1)) {
1652 if (mesh_nexthop_resolve(sdata, skb))
1653 return; /* skb queued: don't free */
1655 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1659 ieee80211_set_qos_hdr(sdata, skb);
1660 ieee80211_tx(sdata, sta, skb, false);
1663 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1665 struct ieee80211_radiotap_iterator iterator;
1666 struct ieee80211_radiotap_header *rthdr =
1667 (struct ieee80211_radiotap_header *) skb->data;
1668 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1669 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1673 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1674 IEEE80211_TX_CTL_DONTFRAG;
1677 * for every radiotap entry that is present
1678 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1679 * entries present, or -EINVAL on error)
1683 ret = ieee80211_radiotap_iterator_next(&iterator);
1688 /* see if this argument is something we can use */
1689 switch (iterator.this_arg_index) {
1691 * You must take care when dereferencing iterator.this_arg
1692 * for multibyte types... the pointer is not aligned. Use
1693 * get_unaligned((type *)iterator.this_arg) to dereference
1694 * iterator.this_arg for type "type" safely on all arches.
1696 case IEEE80211_RADIOTAP_FLAGS:
1697 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1699 * this indicates that the skb we have been
1700 * handed has the 32-bit FCS CRC at the end...
1701 * we should react to that by snipping it off
1702 * because it will be recomputed and added
1705 if (skb->len < (iterator._max_length + FCS_LEN))
1708 skb_trim(skb, skb->len - FCS_LEN);
1710 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1711 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1712 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1713 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1716 case IEEE80211_RADIOTAP_TX_FLAGS:
1717 txflags = get_unaligned_le16(iterator.this_arg);
1718 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1719 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1723 * Please update the file
1724 * Documentation/networking/mac80211-injection.txt
1725 * when parsing new fields here.
1733 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1737 * remove the radiotap header
1738 * iterator->_max_length was sanity-checked against
1739 * skb->len by iterator init
1741 skb_pull(skb, iterator._max_length);
1746 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1747 struct net_device *dev)
1749 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1750 struct ieee80211_chanctx_conf *chanctx_conf;
1751 struct ieee80211_radiotap_header *prthdr =
1752 (struct ieee80211_radiotap_header *)skb->data;
1753 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1754 struct ieee80211_hdr *hdr;
1755 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1756 struct cfg80211_chan_def *chandef;
1760 /* check for not even having the fixed radiotap header part */
1761 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1762 goto fail; /* too short to be possibly valid */
1764 /* is it a header version we can trust to find length from? */
1765 if (unlikely(prthdr->it_version))
1766 goto fail; /* only version 0 is supported */
1768 /* then there must be a radiotap header with a length we can use */
1769 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1771 /* does the skb contain enough to deliver on the alleged length? */
1772 if (unlikely(skb->len < len_rthdr))
1773 goto fail; /* skb too short for claimed rt header extent */
1776 * fix up the pointers accounting for the radiotap
1777 * header still being in there. We are being given
1778 * a precooked IEEE80211 header so no need for
1781 skb_set_mac_header(skb, len_rthdr);
1783 * these are just fixed to the end of the rt area since we
1784 * don't have any better information and at this point, nobody cares
1786 skb_set_network_header(skb, len_rthdr);
1787 skb_set_transport_header(skb, len_rthdr);
1789 if (skb->len < len_rthdr + 2)
1792 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1793 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1795 if (skb->len < len_rthdr + hdrlen)
1799 * Initialize skb->protocol if the injected frame is a data frame
1800 * carrying a rfc1042 header
1802 if (ieee80211_is_data(hdr->frame_control) &&
1803 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1804 u8 *payload = (u8 *)hdr + hdrlen;
1806 if (ether_addr_equal(payload, rfc1042_header))
1807 skb->protocol = cpu_to_be16((payload[6] << 8) |
1811 memset(info, 0, sizeof(*info));
1813 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1814 IEEE80211_TX_CTL_INJECTED;
1816 /* process and remove the injection radiotap header */
1817 if (!ieee80211_parse_tx_radiotap(skb))
1823 * We process outgoing injected frames that have a local address
1824 * we handle as though they are non-injected frames.
1825 * This code here isn't entirely correct, the local MAC address
1826 * isn't always enough to find the interface to use; for proper
1827 * VLAN/WDS support we will need a different mechanism (which
1828 * likely isn't going to be monitor interfaces).
1830 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1832 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1833 if (!ieee80211_sdata_running(tmp_sdata))
1835 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1836 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1837 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1839 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1845 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1846 if (!chanctx_conf) {
1847 tmp_sdata = rcu_dereference(local->monitor_sdata);
1850 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1854 chandef = &chanctx_conf->def;
1855 else if (!local->use_chanctx)
1856 chandef = &local->_oper_chandef;
1861 * Frame injection is not allowed if beaconing is not allowed
1862 * or if we need radar detection. Beaconing is usually not allowed when
1863 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1864 * Passive scan is also used in world regulatory domains where
1865 * your country is not known and as such it should be treated as
1866 * NO TX unless the channel is explicitly allowed in which case
1867 * your current regulatory domain would not have the passive scan
1870 * Since AP mode uses monitor interfaces to inject/TX management
1871 * frames we can make AP mode the exception to this rule once it
1872 * supports radar detection as its implementation can deal with
1873 * radar detection by itself. We can do that later by adding a
1874 * monitor flag interfaces used for AP support.
1876 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1880 info->band = chandef->chan->band;
1881 ieee80211_xmit(sdata, NULL, skb);
1884 return NETDEV_TX_OK;
1890 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1893 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
1895 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
1897 return ethertype == ETH_P_TDLS &&
1899 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1902 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
1903 struct sk_buff *skb,
1904 struct sta_info **sta_out)
1906 struct sta_info *sta;
1908 switch (sdata->vif.type) {
1909 case NL80211_IFTYPE_AP_VLAN:
1910 sta = rcu_dereference(sdata->u.vlan.sta);
1914 } else if (sdata->wdev.use_4addr) {
1918 case NL80211_IFTYPE_AP:
1919 case NL80211_IFTYPE_OCB:
1920 case NL80211_IFTYPE_ADHOC:
1921 if (is_multicast_ether_addr(skb->data)) {
1922 *sta_out = ERR_PTR(-ENOENT);
1925 sta = sta_info_get_bss(sdata, skb->data);
1927 case NL80211_IFTYPE_WDS:
1928 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
1930 #ifdef CONFIG_MAC80211_MESH
1931 case NL80211_IFTYPE_MESH_POINT:
1932 /* determined much later */
1936 case NL80211_IFTYPE_STATION:
1937 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1938 sta = sta_info_get(sdata, skb->data);
1940 bool tdls_peer, tdls_auth;
1942 tdls_peer = test_sta_flag(sta,
1943 WLAN_STA_TDLS_PEER);
1944 tdls_auth = test_sta_flag(sta,
1945 WLAN_STA_TDLS_PEER_AUTH);
1947 if (tdls_peer && tdls_auth) {
1953 * TDLS link during setup - throw out frames to
1954 * peer. Allow TDLS-setup frames to unauthorized
1955 * peers for the special case of a link teardown
1956 * after a TDLS sta is removed due to being
1959 if (tdls_peer && !tdls_auth &&
1960 !ieee80211_is_tdls_setup(skb))
1966 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
1974 *sta_out = sta ?: ERR_PTR(-ENOENT);
1979 * ieee80211_build_hdr - build 802.11 header in the given frame
1980 * @sdata: virtual interface to build the header for
1981 * @skb: the skb to build the header in
1982 * @info_flags: skb flags to set
1984 * This function takes the skb with 802.3 header and reformats the header to
1985 * the appropriate IEEE 802.11 header based on which interface the packet is
1986 * being transmitted on.
1988 * Note that this function also takes care of the TX status request and
1989 * potential unsharing of the SKB - this needs to be interleaved with the
1992 * The function requires the read-side RCU lock held
1994 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1996 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
1997 struct sk_buff *skb, u32 info_flags,
1998 struct sta_info *sta)
2000 struct ieee80211_local *local = sdata->local;
2001 struct ieee80211_tx_info *info;
2003 u16 ethertype, hdrlen, meshhdrlen = 0;
2005 struct ieee80211_hdr hdr;
2006 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2007 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2008 const u8 *encaps_data;
2009 int encaps_len, skip_header_bytes;
2011 bool wme_sta = false, authorized = false;
2015 struct ieee80211_chanctx_conf *chanctx_conf;
2016 struct ieee80211_sub_if_data *ap_sdata;
2017 enum ieee80211_band band;
2023 /* convert Ethernet header to proper 802.11 header (based on
2024 * operation mode) */
2025 ethertype = (skb->data[12] << 8) | skb->data[13];
2026 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2028 switch (sdata->vif.type) {
2029 case NL80211_IFTYPE_AP_VLAN:
2030 if (sdata->wdev.use_4addr) {
2031 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2033 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2034 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2035 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2036 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2038 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2039 wme_sta = sta->sta.wme;
2041 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2043 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2044 if (!chanctx_conf) {
2048 band = chanctx_conf->def.chan->band;
2049 if (sdata->wdev.use_4addr)
2052 case NL80211_IFTYPE_AP:
2053 if (sdata->vif.type == NL80211_IFTYPE_AP)
2054 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2055 if (!chanctx_conf) {
2059 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2061 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2062 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2063 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2065 band = chanctx_conf->def.chan->band;
2067 case NL80211_IFTYPE_WDS:
2068 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2070 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2071 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2072 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2073 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2076 * This is the exception! WDS style interfaces are prohibited
2077 * when channel contexts are in used so this must be valid
2079 band = local->hw.conf.chandef.chan->band;
2081 #ifdef CONFIG_MAC80211_MESH
2082 case NL80211_IFTYPE_MESH_POINT:
2083 if (!is_multicast_ether_addr(skb->data)) {
2084 struct sta_info *next_hop;
2085 bool mpp_lookup = true;
2087 mpath = mesh_path_lookup(sdata, skb->data);
2090 next_hop = rcu_dereference(mpath->next_hop);
2092 !(mpath->flags & (MESH_PATH_ACTIVE |
2093 MESH_PATH_RESOLVING)))
2098 mppath = mpp_path_lookup(sdata, skb->data);
2100 if (mppath && mpath)
2101 mesh_path_del(mpath->sdata, mpath->dst);
2105 * Use address extension if it is a packet from
2106 * another interface or if we know the destination
2107 * is being proxied by a portal (i.e. portal address
2108 * differs from proxied address)
2110 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2111 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2112 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2113 skb->data, skb->data + ETH_ALEN);
2114 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2117 /* DS -> MBSS (802.11-2012 13.11.3.3).
2118 * For unicast with unknown forwarding information,
2119 * destination might be in the MBSS or if that fails
2120 * forwarded to another mesh gate. In either case
2121 * resolution will be handled in ieee80211_xmit(), so
2122 * leave the original DA. This also works for mcast */
2123 const u8 *mesh_da = skb->data;
2126 mesh_da = mppath->mpp;
2128 mesh_da = mpath->dst;
2130 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2131 mesh_da, sdata->vif.addr);
2132 if (is_multicast_ether_addr(mesh_da))
2133 /* DA TA mSA AE:SA */
2134 meshhdrlen = ieee80211_new_mesh_header(
2136 skb->data + ETH_ALEN, NULL);
2138 /* RA TA mDA mSA AE:DA SA */
2139 meshhdrlen = ieee80211_new_mesh_header(
2140 sdata, &mesh_hdr, skb->data,
2141 skb->data + ETH_ALEN);
2144 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2145 if (!chanctx_conf) {
2149 band = chanctx_conf->def.chan->band;
2152 case NL80211_IFTYPE_STATION:
2153 /* we already did checks when looking up the RA STA */
2154 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2158 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2159 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2160 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2162 } else if (sdata->u.mgd.use_4addr &&
2163 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2164 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2165 IEEE80211_FCTL_TODS);
2167 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2168 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2169 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2170 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2173 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2175 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2176 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2177 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2180 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2181 if (!chanctx_conf) {
2185 band = chanctx_conf->def.chan->band;
2187 case NL80211_IFTYPE_OCB:
2189 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2190 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2191 eth_broadcast_addr(hdr.addr3);
2193 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2194 if (!chanctx_conf) {
2198 band = chanctx_conf->def.chan->band;
2200 case NL80211_IFTYPE_ADHOC:
2202 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2203 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2204 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2206 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2207 if (!chanctx_conf) {
2211 band = chanctx_conf->def.chan->band;
2218 multicast = is_multicast_ether_addr(hdr.addr1);
2220 /* sta is always NULL for mesh */
2222 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2223 wme_sta = sta->sta.wme;
2224 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2225 /* For mesh, the use of the QoS header is mandatory */
2229 /* receiver does QoS (which also means we do) use it */
2231 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2236 * Drop unicast frames to unauthorised stations unless they are
2237 * EAPOL frames from the local station.
2239 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2240 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2241 !multicast && !authorized &&
2242 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2243 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2244 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2245 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2246 sdata->name, hdr.addr1);
2249 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2255 if (unlikely(!multicast && skb->sk &&
2256 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2257 struct sk_buff *ack_skb = skb_clone_sk(skb);
2260 unsigned long flags;
2263 spin_lock_irqsave(&local->ack_status_lock, flags);
2264 id = idr_alloc(&local->ack_status_frames, ack_skb,
2265 1, 0x10000, GFP_ATOMIC);
2266 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2270 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2278 * If the skb is shared we need to obtain our own copy.
2280 if (skb_shared(skb)) {
2281 struct sk_buff *tmp_skb = skb;
2283 /* can't happen -- skb is a clone if info_id != 0 */
2286 skb = skb_clone(skb, GFP_ATOMIC);
2295 hdr.frame_control = fc;
2296 hdr.duration_id = 0;
2299 skip_header_bytes = ETH_HLEN;
2300 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2301 encaps_data = bridge_tunnel_header;
2302 encaps_len = sizeof(bridge_tunnel_header);
2303 skip_header_bytes -= 2;
2304 } else if (ethertype >= ETH_P_802_3_MIN) {
2305 encaps_data = rfc1042_header;
2306 encaps_len = sizeof(rfc1042_header);
2307 skip_header_bytes -= 2;
2313 nh_pos = skb_network_header(skb) - skb->data;
2314 h_pos = skb_transport_header(skb) - skb->data;
2316 skb_pull(skb, skip_header_bytes);
2317 nh_pos -= skip_header_bytes;
2318 h_pos -= skip_header_bytes;
2320 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2323 * So we need to modify the skb header and hence need a copy of
2324 * that. The head_need variable above doesn't, so far, include
2325 * the needed header space that we don't need right away. If we
2326 * can, then we don't reallocate right now but only after the
2327 * frame arrives at the master device (if it does...)
2329 * If we cannot, however, then we will reallocate to include all
2330 * the ever needed space. Also, if we need to reallocate it anyway,
2331 * make it big enough for everything we may ever need.
2334 if (head_need > 0 || skb_cloned(skb)) {
2335 head_need += sdata->encrypt_headroom;
2336 head_need += local->tx_headroom;
2337 head_need = max_t(int, 0, head_need);
2338 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2339 ieee80211_free_txskb(&local->hw, skb);
2341 return ERR_PTR(-ENOMEM);
2346 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2347 nh_pos += encaps_len;
2348 h_pos += encaps_len;
2351 #ifdef CONFIG_MAC80211_MESH
2352 if (meshhdrlen > 0) {
2353 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2354 nh_pos += meshhdrlen;
2355 h_pos += meshhdrlen;
2359 if (ieee80211_is_data_qos(fc)) {
2360 __le16 *qos_control;
2362 qos_control = (__le16 *) skb_push(skb, 2);
2363 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2365 * Maybe we could actually set some fields here, for now just
2366 * initialise to zero to indicate no special operation.
2370 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2375 /* Update skb pointers to various headers since this modified frame
2376 * is going to go through Linux networking code that may potentially
2377 * need things like pointer to IP header. */
2378 skb_set_mac_header(skb, 0);
2379 skb_set_network_header(skb, nh_pos);
2380 skb_set_transport_header(skb, h_pos);
2382 info = IEEE80211_SKB_CB(skb);
2383 memset(info, 0, sizeof(*info));
2385 info->flags = info_flags;
2386 info->ack_frame_id = info_id;
2392 return ERR_PTR(ret);
2396 * fast-xmit overview
2398 * The core idea of this fast-xmit is to remove per-packet checks by checking
2399 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2400 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2401 * much less work can be done per packet. For example, fragmentation must be
2402 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2405 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2406 * header and other data to aid packet processing in ieee80211_xmit_fast().
2408 * The most difficult part of this is that when any of these assumptions
2409 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2410 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2411 * since the per-packet code no longer checks the conditions. This is reflected
2412 * by the calls to these functions throughout the rest of the code, and must be
2413 * maintained if any of the TX path checks change.
2416 void ieee80211_check_fast_xmit(struct sta_info *sta)
2418 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2419 struct ieee80211_local *local = sta->local;
2420 struct ieee80211_sub_if_data *sdata = sta->sdata;
2421 struct ieee80211_hdr *hdr = (void *)build.hdr;
2422 struct ieee80211_chanctx_conf *chanctx_conf;
2425 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2428 /* Locking here protects both the pointer itself, and against concurrent
2429 * invocations winning data access races to, e.g., the key pointer that
2431 * Without it, the invocation of this function right after the key
2432 * pointer changes wouldn't be sufficient, as another CPU could access
2433 * the pointer, then stall, and then do the cache update after the CPU
2434 * that invalidated the key.
2435 * With the locking, such scenarios cannot happen as the check for the
2436 * key and the fast-tx assignment are done atomically, so the CPU that
2437 * modifies the key will either wait or other one will see the key
2438 * cleared/changed already.
2440 spin_lock_bh(&sta->lock);
2441 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2442 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2443 sdata->vif.type == NL80211_IFTYPE_STATION)
2446 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2449 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2450 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2451 test_sta_flag(sta, WLAN_STA_PS_DELIVER))
2454 if (sdata->noack_map)
2457 /* fast-xmit doesn't handle fragmentation at all */
2458 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2459 !local->ops->set_frag_threshold)
2463 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2464 if (!chanctx_conf) {
2468 build.band = chanctx_conf->def.chan->band;
2471 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2473 switch (sdata->vif.type) {
2474 case NL80211_IFTYPE_ADHOC:
2476 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2477 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2478 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2481 case NL80211_IFTYPE_STATION:
2482 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2484 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2485 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2486 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2491 if (sdata->u.mgd.use_4addr) {
2492 /* non-regular ethertype cannot use the fastpath */
2493 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2494 IEEE80211_FCTL_TODS);
2496 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2497 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2498 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2499 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2503 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2505 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2506 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2507 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2510 case NL80211_IFTYPE_AP_VLAN:
2511 if (sdata->wdev.use_4addr) {
2512 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2513 IEEE80211_FCTL_TODS);
2515 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2516 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2517 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2518 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2523 case NL80211_IFTYPE_AP:
2524 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2526 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2527 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2528 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2532 /* not handled on fast-xmit */
2538 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2541 /* We store the key here so there's no point in using rcu_dereference()
2542 * but that's fine because the code that changes the pointers will call
2543 * this function after doing so. For a single CPU that would be enough,
2544 * for multiple see the comment above.
2546 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2548 build.key = rcu_access_pointer(sdata->default_unicast_key);
2550 bool gen_iv, iv_spc, mmic;
2552 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2553 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2554 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2556 /* don't handle software crypto */
2557 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2560 switch (build.key->conf.cipher) {
2561 case WLAN_CIPHER_SUITE_CCMP:
2562 case WLAN_CIPHER_SUITE_CCMP_256:
2563 /* add fixed key ID */
2565 (build.hdr + build.hdr_len)[3] =
2566 0x20 | (build.key->conf.keyidx << 6);
2567 build.pn_offs = build.hdr_len;
2569 if (gen_iv || iv_spc)
2570 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2572 case WLAN_CIPHER_SUITE_GCMP:
2573 case WLAN_CIPHER_SUITE_GCMP_256:
2574 /* add fixed key ID */
2576 (build.hdr + build.hdr_len)[3] =
2577 0x20 | (build.key->conf.keyidx << 6);
2578 build.pn_offs = build.hdr_len;
2580 if (gen_iv || iv_spc)
2581 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2583 case WLAN_CIPHER_SUITE_TKIP:
2584 /* cannot handle MMIC or IV generation in xmit-fast */
2588 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2590 case WLAN_CIPHER_SUITE_WEP40:
2591 case WLAN_CIPHER_SUITE_WEP104:
2592 /* cannot handle IV generation in fast-xmit */
2596 build.hdr_len += IEEE80211_WEP_IV_LEN;
2598 case WLAN_CIPHER_SUITE_AES_CMAC:
2599 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2600 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2601 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2603 "management cipher suite 0x%x enabled for data\n",
2604 build.key->conf.cipher);
2607 /* we don't know how to generate IVs for this at all */
2608 if (WARN_ON(gen_iv))
2610 /* pure hardware keys are OK, of course */
2611 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2613 /* cipher scheme might require space allocation */
2615 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2618 build.hdr_len += build.key->conf.iv_len;
2621 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2624 hdr->frame_control = fc;
2626 memcpy(build.hdr + build.hdr_len,
2627 rfc1042_header, sizeof(rfc1042_header));
2628 build.hdr_len += sizeof(rfc1042_header);
2630 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2631 /* if the kmemdup fails, continue w/o fast_tx */
2636 /* we might have raced against another call to this function */
2637 old = rcu_dereference_protected(sta->fast_tx,
2638 lockdep_is_held(&sta->lock));
2639 rcu_assign_pointer(sta->fast_tx, fast_tx);
2641 kfree_rcu(old, rcu_head);
2642 spin_unlock_bh(&sta->lock);
2645 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2647 struct sta_info *sta;
2650 list_for_each_entry_rcu(sta, &local->sta_list, list)
2651 ieee80211_check_fast_xmit(sta);
2655 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2657 struct ieee80211_local *local = sdata->local;
2658 struct sta_info *sta;
2662 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2663 if (sdata != sta->sdata &&
2664 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
2666 ieee80211_check_fast_xmit(sta);
2672 void ieee80211_clear_fast_xmit(struct sta_info *sta)
2674 struct ieee80211_fast_tx *fast_tx;
2676 spin_lock_bh(&sta->lock);
2677 fast_tx = rcu_dereference_protected(sta->fast_tx,
2678 lockdep_is_held(&sta->lock));
2679 RCU_INIT_POINTER(sta->fast_tx, NULL);
2680 spin_unlock_bh(&sta->lock);
2683 kfree_rcu(fast_tx, rcu_head);
2686 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
2687 struct net_device *dev, struct sta_info *sta,
2688 struct ieee80211_fast_tx *fast_tx,
2689 struct sk_buff *skb)
2691 struct ieee80211_local *local = sdata->local;
2692 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2693 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
2694 int hw_headroom = sdata->local->hw.extra_tx_headroom;
2696 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2697 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
2698 struct ieee80211_tx_data tx;
2699 ieee80211_tx_result r;
2700 struct tid_ampdu_tx *tid_tx = NULL;
2701 u8 tid = IEEE80211_NUM_TIDS;
2703 /* control port protocol needs a lot of special handling */
2704 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
2707 /* only RFC 1042 SNAP */
2708 if (ethertype < ETH_P_802_3_MIN)
2711 /* don't handle TX status request here either */
2712 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
2715 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2716 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2717 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
2719 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2721 if (tid_tx->timeout)
2722 tid_tx->last_tx = jiffies;
2726 /* after this point (skb is modified) we cannot return false */
2728 if (skb_shared(skb)) {
2729 struct sk_buff *tmp_skb = skb;
2731 skb = skb_clone(skb, GFP_ATOMIC);
2738 ieee80211_tx_stats(dev, skb->len + extra_head);
2740 /* will not be crypto-handled beyond what we do here, so use false
2741 * as the may-encrypt argument for the resize to not account for
2742 * more room than we already have in 'extra_head'
2744 if (unlikely(ieee80211_skb_resize(sdata, skb,
2745 max_t(int, extra_head + hw_headroom -
2746 skb_headroom(skb), 0),
2752 memcpy(ð, skb->data, ETH_HLEN - 2);
2753 hdr = (void *)skb_push(skb, extra_head);
2754 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
2755 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
2756 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
2758 memset(info, 0, sizeof(*info));
2759 info->band = fast_tx->band;
2760 info->control.vif = &sdata->vif;
2761 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
2762 IEEE80211_TX_CTL_DONTFRAG |
2763 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
2765 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2766 *ieee80211_get_qos_ctl(hdr) = tid;
2767 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
2769 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2770 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
2771 sdata->sequence_number += 0x10;
2774 sta->tx_msdu[tid]++;
2776 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
2778 __skb_queue_head_init(&tx.skbs);
2780 tx.flags = IEEE80211_TX_UNICAST;
2784 tx.key = fast_tx->key;
2787 info->control.hw_key = &fast_tx->key->conf;
2789 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
2791 r = ieee80211_tx_h_rate_ctrl(&tx);
2795 if (r != TX_CONTINUE) {
2802 /* statistics normally done by ieee80211_tx_h_stats (but that
2803 * has to consider fragmentation, so is more complex)
2805 sta->tx_bytes[skb_get_queue_mapping(skb)] += skb->len;
2806 sta->tx_packets[skb_get_queue_mapping(skb)]++;
2808 if (fast_tx->pn_offs) {
2810 u8 *crypto_hdr = skb->data + fast_tx->pn_offs;
2812 switch (fast_tx->key->conf.cipher) {
2813 case WLAN_CIPHER_SUITE_CCMP:
2814 case WLAN_CIPHER_SUITE_CCMP_256:
2815 case WLAN_CIPHER_SUITE_GCMP:
2816 case WLAN_CIPHER_SUITE_GCMP_256:
2817 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
2819 crypto_hdr[1] = pn >> 8;
2820 crypto_hdr[4] = pn >> 16;
2821 crypto_hdr[5] = pn >> 24;
2822 crypto_hdr[6] = pn >> 32;
2823 crypto_hdr[7] = pn >> 40;
2828 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2829 sdata = container_of(sdata->bss,
2830 struct ieee80211_sub_if_data, u.ap);
2832 __skb_queue_tail(&tx.skbs, skb);
2833 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
2837 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2838 struct net_device *dev,
2841 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2842 struct sta_info *sta;
2843 struct sk_buff *next;
2845 if (unlikely(skb->len < ETH_HLEN)) {
2852 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
2855 if (!IS_ERR_OR_NULL(sta)) {
2856 struct ieee80211_fast_tx *fast_tx;
2858 fast_tx = rcu_dereference(sta->fast_tx);
2861 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
2865 if (skb_is_gso(skb)) {
2866 struct sk_buff *segs;
2868 segs = skb_gso_segment(skb, 0);
2876 /* we cannot process non-linear frames on this path */
2877 if (skb_linearize(skb)) {
2882 /* the frame could be fragmented, software-encrypted, and other
2883 * things so we cannot really handle checksum offload with it -
2884 * fix it up in software before we handle anything else.
2886 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2887 skb_set_transport_header(skb,
2888 skb_checksum_start_offset(skb));
2889 if (skb_checksum_help(skb))
2902 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2906 ieee80211_tx_stats(dev, skb->len);
2908 ieee80211_xmit(sdata, sta, skb);
2918 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2919 * @skb: packet to be sent
2920 * @dev: incoming interface
2922 * On failure skb will be freed.
2924 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
2925 struct net_device *dev)
2927 __ieee80211_subif_start_xmit(skb, dev, 0);
2928 return NETDEV_TX_OK;
2932 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
2933 struct sk_buff *skb, u32 info_flags)
2935 struct ieee80211_hdr *hdr;
2936 struct ieee80211_tx_data tx = {
2937 .local = sdata->local,
2940 struct sta_info *sta;
2944 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
2946 skb = ERR_PTR(-EINVAL);
2950 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2954 hdr = (void *)skb->data;
2955 tx.sta = sta_info_get(sdata, hdr->addr1);
2958 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
2961 return ERR_PTR(-EINVAL);
2970 * ieee80211_clear_tx_pending may not be called in a context where
2971 * it is possible that it packets could come in again.
2973 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2975 struct sk_buff *skb;
2978 for (i = 0; i < local->hw.queues; i++) {
2979 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2980 ieee80211_free_txskb(&local->hw, skb);
2985 * Returns false if the frame couldn't be transmitted but was queued instead,
2986 * which in this case means re-queued -- take as an indication to stop sending
2987 * more pending frames.
2989 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2990 struct sk_buff *skb)
2992 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2993 struct ieee80211_sub_if_data *sdata;
2994 struct sta_info *sta;
2995 struct ieee80211_hdr *hdr;
2997 struct ieee80211_chanctx_conf *chanctx_conf;
2999 sdata = vif_to_sdata(info->control.vif);
3001 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3002 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3003 if (unlikely(!chanctx_conf)) {
3007 info->band = chanctx_conf->def.chan->band;
3008 result = ieee80211_tx(sdata, NULL, skb, true);
3010 struct sk_buff_head skbs;
3012 __skb_queue_head_init(&skbs);
3013 __skb_queue_tail(&skbs, skb);
3015 hdr = (struct ieee80211_hdr *)skb->data;
3016 sta = sta_info_get(sdata, hdr->addr1);
3018 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3025 * Transmit all pending packets. Called from tasklet.
3027 void ieee80211_tx_pending(unsigned long data)
3029 struct ieee80211_local *local = (struct ieee80211_local *)data;
3030 unsigned long flags;
3036 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3037 for (i = 0; i < local->hw.queues; i++) {
3039 * If queue is stopped by something other than due to pending
3040 * frames, or we have no pending frames, proceed to next queue.
3042 if (local->queue_stop_reasons[i] ||
3043 skb_queue_empty(&local->pending[i]))
3046 while (!skb_queue_empty(&local->pending[i])) {
3047 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3048 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3050 if (WARN_ON(!info->control.vif)) {
3051 ieee80211_free_txskb(&local->hw, skb);
3055 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3058 txok = ieee80211_tx_pending_skb(local, skb);
3059 spin_lock_irqsave(&local->queue_stop_reason_lock,
3065 if (skb_queue_empty(&local->pending[i]))
3066 ieee80211_propagate_queue_wake(local, i);
3068 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3073 /* functions for drivers to get certain frames */
3075 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3076 struct ps_data *ps, struct sk_buff *skb,
3081 int i, have_bits = 0, n1, n2;
3083 /* Generate bitmap for TIM only if there are any STAs in power save
3085 if (atomic_read(&ps->num_sta_ps) > 0)
3086 /* in the hope that this is faster than
3087 * checking byte-for-byte */
3088 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3089 IEEE80211_MAX_AID+1);
3091 if (ps->dtim_count == 0)
3092 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3097 tim = pos = (u8 *) skb_put(skb, 6);
3098 *pos++ = WLAN_EID_TIM;
3100 *pos++ = ps->dtim_count;
3101 *pos++ = sdata->vif.bss_conf.dtim_period;
3103 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3106 ps->dtim_bc_mc = aid0 == 1;
3109 /* Find largest even number N1 so that bits numbered 1 through
3110 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3111 * (N2 + 1) x 8 through 2007 are 0. */
3113 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3120 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3127 /* Bitmap control */
3129 /* Part Virt Bitmap */
3130 skb_put(skb, n2 - n1);
3131 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3133 tim[1] = n2 - n1 + 4;
3135 *pos++ = aid0; /* Bitmap control */
3136 *pos++ = 0; /* Part Virt Bitmap */
3140 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3141 struct ps_data *ps, struct sk_buff *skb,
3144 struct ieee80211_local *local = sdata->local;
3147 * Not very nice, but we want to allow the driver to call
3148 * ieee80211_beacon_get() as a response to the set_tim()
3149 * callback. That, however, is already invoked under the
3150 * sta_lock to guarantee consistent and race-free update
3151 * of the tim bitmap in mac80211 and the driver.
3153 if (local->tim_in_locked_section) {
3154 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3156 spin_lock_bh(&local->tim_lock);
3157 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3158 spin_unlock_bh(&local->tim_lock);
3164 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3165 struct beacon_data *beacon)
3167 struct probe_resp *resp;
3169 size_t beacon_data_len;
3171 u8 count = beacon->csa_current_counter;
3173 switch (sdata->vif.type) {
3174 case NL80211_IFTYPE_AP:
3175 beacon_data = beacon->tail;
3176 beacon_data_len = beacon->tail_len;
3178 case NL80211_IFTYPE_ADHOC:
3179 beacon_data = beacon->head;
3180 beacon_data_len = beacon->head_len;
3182 case NL80211_IFTYPE_MESH_POINT:
3183 beacon_data = beacon->head;
3184 beacon_data_len = beacon->head_len;
3191 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3192 resp = rcu_dereference(sdata->u.ap.probe_resp);
3194 if (beacon->csa_counter_offsets[i]) {
3195 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3201 beacon_data[beacon->csa_counter_offsets[i]] = count;
3204 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3205 resp->data[resp->csa_counter_offsets[i]] = count;
3210 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3212 beacon->csa_current_counter--;
3214 /* the counter should never reach 0 */
3215 WARN_ON_ONCE(!beacon->csa_current_counter);
3217 return beacon->csa_current_counter;
3220 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3222 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3223 struct beacon_data *beacon = NULL;
3228 if (sdata->vif.type == NL80211_IFTYPE_AP)
3229 beacon = rcu_dereference(sdata->u.ap.beacon);
3230 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3231 beacon = rcu_dereference(sdata->u.ibss.presp);
3232 else if (ieee80211_vif_is_mesh(&sdata->vif))
3233 beacon = rcu_dereference(sdata->u.mesh.beacon);
3238 count = __ieee80211_csa_update_counter(beacon);
3244 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3246 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3248 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3249 struct beacon_data *beacon = NULL;
3251 size_t beacon_data_len;
3254 if (!ieee80211_sdata_running(sdata))
3258 if (vif->type == NL80211_IFTYPE_AP) {
3259 struct ieee80211_if_ap *ap = &sdata->u.ap;
3261 beacon = rcu_dereference(ap->beacon);
3262 if (WARN_ON(!beacon || !beacon->tail))
3264 beacon_data = beacon->tail;
3265 beacon_data_len = beacon->tail_len;
3266 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3267 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3269 beacon = rcu_dereference(ifibss->presp);
3273 beacon_data = beacon->head;
3274 beacon_data_len = beacon->head_len;
3275 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3276 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3278 beacon = rcu_dereference(ifmsh->beacon);
3282 beacon_data = beacon->head;
3283 beacon_data_len = beacon->head_len;
3289 if (!beacon->csa_counter_offsets[0])
3292 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3295 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3302 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3304 static struct sk_buff *
3305 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3306 struct ieee80211_vif *vif,
3307 struct ieee80211_mutable_offsets *offs,
3310 struct ieee80211_local *local = hw_to_local(hw);
3311 struct beacon_data *beacon = NULL;
3312 struct sk_buff *skb = NULL;
3313 struct ieee80211_tx_info *info;
3314 struct ieee80211_sub_if_data *sdata = NULL;
3315 enum ieee80211_band band;
3316 struct ieee80211_tx_rate_control txrc;
3317 struct ieee80211_chanctx_conf *chanctx_conf;
3318 int csa_off_base = 0;
3322 sdata = vif_to_sdata(vif);
3323 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3325 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3329 memset(offs, 0, sizeof(*offs));
3331 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3332 struct ieee80211_if_ap *ap = &sdata->u.ap;
3334 beacon = rcu_dereference(ap->beacon);
3336 if (beacon->csa_counter_offsets[0]) {
3338 __ieee80211_csa_update_counter(beacon);
3340 ieee80211_set_csa(sdata, beacon);
3344 * headroom, head length,
3345 * tail length and maximum TIM length
3347 skb = dev_alloc_skb(local->tx_headroom +
3349 beacon->tail_len + 256 +
3350 local->hw.extra_beacon_tailroom);
3354 skb_reserve(skb, local->tx_headroom);
3355 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3358 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3362 offs->tim_offset = beacon->head_len;
3363 offs->tim_length = skb->len - beacon->head_len;
3365 /* for AP the csa offsets are from tail */
3366 csa_off_base = skb->len;
3370 memcpy(skb_put(skb, beacon->tail_len),
3371 beacon->tail, beacon->tail_len);
3374 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
3375 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3376 struct ieee80211_hdr *hdr;
3378 beacon = rcu_dereference(ifibss->presp);
3382 if (beacon->csa_counter_offsets[0]) {
3384 __ieee80211_csa_update_counter(beacon);
3386 ieee80211_set_csa(sdata, beacon);
3389 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
3390 local->hw.extra_beacon_tailroom);
3393 skb_reserve(skb, local->tx_headroom);
3394 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3397 hdr = (struct ieee80211_hdr *) skb->data;
3398 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3399 IEEE80211_STYPE_BEACON);
3400 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3401 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3403 beacon = rcu_dereference(ifmsh->beacon);
3407 if (beacon->csa_counter_offsets[0]) {
3409 /* TODO: For mesh csa_counter is in TU, so
3410 * decrementing it by one isn't correct, but
3411 * for now we leave it consistent with overall
3412 * mac80211's behavior.
3414 __ieee80211_csa_update_counter(beacon);
3416 ieee80211_set_csa(sdata, beacon);
3419 if (ifmsh->sync_ops)
3420 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
3422 skb = dev_alloc_skb(local->tx_headroom +
3426 local->hw.extra_beacon_tailroom);
3429 skb_reserve(skb, local->tx_headroom);
3430 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3432 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
3435 offs->tim_offset = beacon->head_len;
3436 offs->tim_length = skb->len - beacon->head_len;
3439 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
3447 if (offs && beacon) {
3450 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
3451 u16 csa_off = beacon->csa_counter_offsets[i];
3456 offs->csa_counter_offs[i] = csa_off_base + csa_off;
3460 band = chanctx_conf->def.chan->band;
3462 info = IEEE80211_SKB_CB(skb);
3464 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
3465 info->flags |= IEEE80211_TX_CTL_NO_ACK;
3468 memset(&txrc, 0, sizeof(txrc));
3470 txrc.sband = local->hw.wiphy->bands[band];
3471 txrc.bss_conf = &sdata->vif.bss_conf;
3473 txrc.reported_rate.idx = -1;
3474 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
3475 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
3476 txrc.max_rate_idx = -1;
3478 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
3480 rate_control_get_rate(sdata, NULL, &txrc);
3482 info->control.vif = vif;
3484 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
3485 IEEE80211_TX_CTL_ASSIGN_SEQ |
3486 IEEE80211_TX_CTL_FIRST_FRAGMENT;
3494 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
3495 struct ieee80211_vif *vif,
3496 struct ieee80211_mutable_offsets *offs)
3498 return __ieee80211_beacon_get(hw, vif, offs, true);
3500 EXPORT_SYMBOL(ieee80211_beacon_get_template);
3502 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
3503 struct ieee80211_vif *vif,
3504 u16 *tim_offset, u16 *tim_length)
3506 struct ieee80211_mutable_offsets offs = {};
3507 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
3510 *tim_offset = offs.tim_offset;
3513 *tim_length = offs.tim_length;
3517 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
3519 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
3520 struct ieee80211_vif *vif)
3522 struct ieee80211_if_ap *ap = NULL;
3523 struct sk_buff *skb = NULL;
3524 struct probe_resp *presp = NULL;
3525 struct ieee80211_hdr *hdr;
3526 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3528 if (sdata->vif.type != NL80211_IFTYPE_AP)
3534 presp = rcu_dereference(ap->probe_resp);
3538 skb = dev_alloc_skb(presp->len);
3542 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
3544 hdr = (struct ieee80211_hdr *) skb->data;
3545 memset(hdr->addr1, 0, sizeof(hdr->addr1));
3551 EXPORT_SYMBOL(ieee80211_proberesp_get);
3553 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
3554 struct ieee80211_vif *vif)
3556 struct ieee80211_sub_if_data *sdata;
3557 struct ieee80211_if_managed *ifmgd;
3558 struct ieee80211_pspoll *pspoll;
3559 struct ieee80211_local *local;
3560 struct sk_buff *skb;
3562 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3565 sdata = vif_to_sdata(vif);
3566 ifmgd = &sdata->u.mgd;
3567 local = sdata->local;
3569 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
3573 skb_reserve(skb, local->hw.extra_tx_headroom);
3575 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
3576 memset(pspoll, 0, sizeof(*pspoll));
3577 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
3578 IEEE80211_STYPE_PSPOLL);
3579 pspoll->aid = cpu_to_le16(ifmgd->aid);
3581 /* aid in PS-Poll has its two MSBs each set to 1 */
3582 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
3584 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
3585 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
3589 EXPORT_SYMBOL(ieee80211_pspoll_get);
3591 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
3592 struct ieee80211_vif *vif)
3594 struct ieee80211_hdr_3addr *nullfunc;
3595 struct ieee80211_sub_if_data *sdata;
3596 struct ieee80211_if_managed *ifmgd;
3597 struct ieee80211_local *local;
3598 struct sk_buff *skb;
3600 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3603 sdata = vif_to_sdata(vif);
3604 ifmgd = &sdata->u.mgd;
3605 local = sdata->local;
3607 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
3611 skb_reserve(skb, local->hw.extra_tx_headroom);
3613 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
3615 memset(nullfunc, 0, sizeof(*nullfunc));
3616 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
3617 IEEE80211_STYPE_NULLFUNC |
3618 IEEE80211_FCTL_TODS);
3619 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
3620 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
3621 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
3625 EXPORT_SYMBOL(ieee80211_nullfunc_get);
3627 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
3629 const u8 *ssid, size_t ssid_len,
3632 struct ieee80211_local *local = hw_to_local(hw);
3633 struct ieee80211_hdr_3addr *hdr;
3634 struct sk_buff *skb;
3638 ie_ssid_len = 2 + ssid_len;
3640 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
3641 ie_ssid_len + tailroom);
3645 skb_reserve(skb, local->hw.extra_tx_headroom);
3647 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3648 memset(hdr, 0, sizeof(*hdr));
3649 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3650 IEEE80211_STYPE_PROBE_REQ);
3651 eth_broadcast_addr(hdr->addr1);
3652 memcpy(hdr->addr2, src_addr, ETH_ALEN);
3653 eth_broadcast_addr(hdr->addr3);
3655 pos = skb_put(skb, ie_ssid_len);
3656 *pos++ = WLAN_EID_SSID;
3659 memcpy(pos, ssid, ssid_len);
3664 EXPORT_SYMBOL(ieee80211_probereq_get);
3666 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3667 const void *frame, size_t frame_len,
3668 const struct ieee80211_tx_info *frame_txctl,
3669 struct ieee80211_rts *rts)
3671 const struct ieee80211_hdr *hdr = frame;
3673 rts->frame_control =
3674 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3675 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3677 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3678 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3680 EXPORT_SYMBOL(ieee80211_rts_get);
3682 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3683 const void *frame, size_t frame_len,
3684 const struct ieee80211_tx_info *frame_txctl,
3685 struct ieee80211_cts *cts)
3687 const struct ieee80211_hdr *hdr = frame;
3689 cts->frame_control =
3690 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3691 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3692 frame_len, frame_txctl);
3693 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3695 EXPORT_SYMBOL(ieee80211_ctstoself_get);
3698 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3699 struct ieee80211_vif *vif)
3701 struct ieee80211_local *local = hw_to_local(hw);
3702 struct sk_buff *skb = NULL;
3703 struct ieee80211_tx_data tx;
3704 struct ieee80211_sub_if_data *sdata;
3706 struct ieee80211_tx_info *info;
3707 struct ieee80211_chanctx_conf *chanctx_conf;
3709 sdata = vif_to_sdata(vif);
3712 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3717 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3718 struct beacon_data *beacon =
3719 rcu_dereference(sdata->u.ap.beacon);
3721 if (!beacon || !beacon->head)
3724 ps = &sdata->u.ap.ps;
3725 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3726 ps = &sdata->u.mesh.ps;
3731 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3732 goto out; /* send buffered bc/mc only after DTIM beacon */
3735 skb = skb_dequeue(&ps->bc_buf);
3738 local->total_ps_buffered--;
3740 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3741 struct ieee80211_hdr *hdr =
3742 (struct ieee80211_hdr *) skb->data;
3743 /* more buffered multicast/broadcast frames ==> set
3744 * MoreData flag in IEEE 802.11 header to inform PS
3746 hdr->frame_control |=
3747 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3750 if (sdata->vif.type == NL80211_IFTYPE_AP)
3751 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3752 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
3754 dev_kfree_skb_any(skb);
3757 info = IEEE80211_SKB_CB(skb);
3759 tx.flags |= IEEE80211_TX_PS_BUFFERED;
3760 info->band = chanctx_conf->def.chan->band;
3762 if (invoke_tx_handlers(&tx))
3769 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3771 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3773 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3774 struct ieee80211_sub_if_data *sdata = sta->sdata;
3775 struct ieee80211_local *local = sdata->local;
3779 lockdep_assert_held(&local->sta_mtx);
3781 /* only some cases are supported right now */
3782 switch (sdata->vif.type) {
3783 case NL80211_IFTYPE_STATION:
3784 case NL80211_IFTYPE_AP:
3785 case NL80211_IFTYPE_AP_VLAN:
3792 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3795 if (sta->reserved_tid == tid) {
3800 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3801 sdata_err(sdata, "TID reservation already active\n");
3806 ieee80211_stop_vif_queues(sdata->local, sdata,
3807 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3811 /* Tear down BA sessions so we stop aggregating on this TID */
3812 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
3813 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3814 __ieee80211_stop_tx_ba_session(sta, tid,
3815 AGG_STOP_LOCAL_REQUEST);
3818 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3819 __ieee80211_flush_queues(local, sdata, queues, false);
3821 sta->reserved_tid = tid;
3823 ieee80211_wake_vif_queues(local, sdata,
3824 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3826 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
3827 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3833 EXPORT_SYMBOL(ieee80211_reserve_tid);
3835 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3837 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3838 struct ieee80211_sub_if_data *sdata = sta->sdata;
3840 lockdep_assert_held(&sdata->local->sta_mtx);
3842 /* only some cases are supported right now */
3843 switch (sdata->vif.type) {
3844 case NL80211_IFTYPE_STATION:
3845 case NL80211_IFTYPE_AP:
3846 case NL80211_IFTYPE_AP_VLAN:
3853 if (tid != sta->reserved_tid) {
3854 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3858 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3860 EXPORT_SYMBOL(ieee80211_unreserve_tid);
3862 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3863 struct sk_buff *skb, int tid,
3864 enum ieee80211_band band)
3866 int ac = ieee802_1d_to_ac[tid & 7];
3868 skb_set_mac_header(skb, 0);
3869 skb_set_network_header(skb, 0);
3870 skb_set_transport_header(skb, 0);
3872 skb_set_queue_mapping(skb, ac);
3873 skb->priority = tid;
3875 skb->dev = sdata->dev;
3878 * The other path calling ieee80211_xmit is from the tasklet,
3879 * and while we can handle concurrent transmissions locking
3880 * requirements are that we do not come into tx with bhs on.
3883 IEEE80211_SKB_CB(skb)->band = band;
3884 ieee80211_xmit(sdata, NULL, skb);