2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 * Transmit and frame generation functions.
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_vlan.h>
20 #include <linux/etherdevice.h>
21 #include <linux/bitmap.h>
22 #include <linux/rcupdate.h>
23 #include <linux/export.h>
24 #include <net/net_namespace.h>
25 #include <net/ieee80211_radiotap.h>
26 #include <net/cfg80211.h>
27 #include <net/mac80211.h>
28 #include <net/codel.h>
29 #include <net/codel_impl.h>
30 #include <asm/unaligned.h>
31 #include <net/fq_impl.h>
33 #include "ieee80211_i.h"
34 #include "driver-ops.h"
44 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
46 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
48 u64_stats_update_begin(&tstats->syncp);
50 tstats->tx_bytes += len;
51 u64_stats_update_end(&tstats->syncp);
54 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
55 struct sk_buff *skb, int group_addr,
58 int rate, mrate, erp, dur, i, shift = 0;
59 struct ieee80211_rate *txrate;
60 struct ieee80211_local *local = tx->local;
61 struct ieee80211_supported_band *sband;
62 struct ieee80211_hdr *hdr;
63 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
64 struct ieee80211_chanctx_conf *chanctx_conf;
67 /* assume HW handles this */
68 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
72 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
74 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
75 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
80 if (WARN_ON_ONCE(tx->rate.idx < 0))
83 sband = local->hw.wiphy->bands[info->band];
84 txrate = &sband->bitrates[tx->rate.idx];
86 erp = txrate->flags & IEEE80211_RATE_ERP_G;
89 * data and mgmt (except PS Poll):
91 * - during contention period:
92 * if addr1 is group address: 0
93 * if more fragments = 0 and addr1 is individual address: time to
94 * transmit one ACK plus SIFS
95 * if more fragments = 1 and addr1 is individual address: time to
96 * transmit next fragment plus 2 x ACK plus 3 x SIFS
99 * - control response frame (CTS or ACK) shall be transmitted using the
100 * same rate as the immediately previous frame in the frame exchange
101 * sequence, if this rate belongs to the PHY mandatory rates, or else
102 * at the highest possible rate belonging to the PHY rates in the
105 hdr = (struct ieee80211_hdr *)skb->data;
106 if (ieee80211_is_ctl(hdr->frame_control)) {
107 /* TODO: These control frames are not currently sent by
108 * mac80211, but should they be implemented, this function
109 * needs to be updated to support duration field calculation.
111 * RTS: time needed to transmit pending data/mgmt frame plus
112 * one CTS frame plus one ACK frame plus 3 x SIFS
113 * CTS: duration of immediately previous RTS minus time
114 * required to transmit CTS and its SIFS
115 * ACK: 0 if immediately previous directed data/mgmt had
116 * more=0, with more=1 duration in ACK frame is duration
117 * from previous frame minus time needed to transmit ACK
119 * PS Poll: BIT(15) | BIT(14) | aid
125 if (0 /* FIX: data/mgmt during CFP */)
126 return cpu_to_le16(32768);
128 if (group_addr) /* Group address as the destination - no ACK */
131 /* Individual destination address:
132 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
133 * CTS and ACK frames shall be transmitted using the highest rate in
134 * basic rate set that is less than or equal to the rate of the
135 * immediately previous frame and that is using the same modulation
136 * (CCK or OFDM). If no basic rate set matches with these requirements,
137 * the highest mandatory rate of the PHY that is less than or equal to
138 * the rate of the previous frame is used.
139 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
142 /* use lowest available if everything fails */
143 mrate = sband->bitrates[0].bitrate;
144 for (i = 0; i < sband->n_bitrates; i++) {
145 struct ieee80211_rate *r = &sband->bitrates[i];
147 if (r->bitrate > txrate->bitrate)
150 if ((rate_flags & r->flags) != rate_flags)
153 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
154 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
156 switch (sband->band) {
157 case NL80211_BAND_2GHZ: {
159 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
160 flag = IEEE80211_RATE_MANDATORY_G;
162 flag = IEEE80211_RATE_MANDATORY_B;
167 case NL80211_BAND_5GHZ:
168 if (r->flags & IEEE80211_RATE_MANDATORY_A)
171 case NL80211_BAND_60GHZ:
172 /* TODO, for now fall through */
173 case NUM_NL80211_BANDS:
179 /* No matching basic rate found; use highest suitable mandatory
181 rate = DIV_ROUND_UP(mrate, 1 << shift);
184 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
185 if (ieee80211_is_data_qos(hdr->frame_control) &&
186 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
189 /* Time needed to transmit ACK
190 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
191 * to closest integer */
192 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
193 tx->sdata->vif.bss_conf.use_short_preamble,
197 /* Frame is fragmented: duration increases with time needed to
198 * transmit next fragment plus ACK and 2 x SIFS. */
199 dur *= 2; /* ACK + SIFS */
201 dur += ieee80211_frame_duration(sband->band, next_frag_len,
202 txrate->bitrate, erp,
203 tx->sdata->vif.bss_conf.use_short_preamble,
207 return cpu_to_le16(dur);
211 static ieee80211_tx_result debug_noinline
212 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
214 struct ieee80211_local *local = tx->local;
215 struct ieee80211_if_managed *ifmgd;
217 /* driver doesn't support power save */
218 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
221 /* hardware does dynamic power save */
222 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
225 /* dynamic power save disabled */
226 if (local->hw.conf.dynamic_ps_timeout <= 0)
229 /* we are scanning, don't enable power save */
233 if (!local->ps_sdata)
236 /* No point if we're going to suspend */
237 if (local->quiescing)
240 /* dynamic ps is supported only in managed mode */
241 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
244 ifmgd = &tx->sdata->u.mgd;
247 * Don't wakeup from power save if u-apsd is enabled, voip ac has
248 * u-apsd enabled and the frame is in voip class. This effectively
249 * means that even if all access categories have u-apsd enabled, in
250 * practise u-apsd is only used with the voip ac. This is a
251 * workaround for the case when received voip class packets do not
252 * have correct qos tag for some reason, due the network or the
255 * Note: ifmgd->uapsd_queues access is racy here. If the value is
256 * changed via debugfs, user needs to reassociate manually to have
257 * everything in sync.
259 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
260 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
261 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
264 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
265 ieee80211_stop_queues_by_reason(&local->hw,
266 IEEE80211_MAX_QUEUE_MAP,
267 IEEE80211_QUEUE_STOP_REASON_PS,
269 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
270 ieee80211_queue_work(&local->hw,
271 &local->dynamic_ps_disable_work);
274 /* Don't restart the timer if we're not disassociated */
275 if (!ifmgd->associated)
278 mod_timer(&local->dynamic_ps_timer, jiffies +
279 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
284 static ieee80211_tx_result debug_noinline
285 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
288 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
289 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
292 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
295 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
296 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
297 !ieee80211_is_probe_req(hdr->frame_control) &&
298 !ieee80211_is_nullfunc(hdr->frame_control))
300 * When software scanning only nullfunc frames (to notify
301 * the sleep state to the AP) and probe requests (for the
302 * active scan) are allowed, all other frames should not be
303 * sent and we should not get here, but if we do
304 * nonetheless, drop them to avoid sending them
305 * off-channel. See the link below and
306 * ieee80211_start_scan() for more.
308 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
312 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
315 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
318 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
322 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
324 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
325 if (unlikely(!assoc &&
326 ieee80211_is_data(hdr->frame_control))) {
327 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
328 sdata_info(tx->sdata,
329 "dropped data frame to not associated station %pM\n",
332 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
335 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
336 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
338 * No associated STAs - no need to send multicast
347 /* This function is called whenever the AP is about to exceed the maximum limit
348 * of buffered frames for power saving STAs. This situation should not really
349 * happen often during normal operation, so dropping the oldest buffered packet
350 * from each queue should be OK to make some room for new frames. */
351 static void purge_old_ps_buffers(struct ieee80211_local *local)
353 int total = 0, purged = 0;
355 struct ieee80211_sub_if_data *sdata;
356 struct sta_info *sta;
358 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
361 if (sdata->vif.type == NL80211_IFTYPE_AP)
362 ps = &sdata->u.ap.ps;
363 else if (ieee80211_vif_is_mesh(&sdata->vif))
364 ps = &sdata->u.mesh.ps;
368 skb = skb_dequeue(&ps->bc_buf);
371 ieee80211_free_txskb(&local->hw, skb);
373 total += skb_queue_len(&ps->bc_buf);
377 * Drop one frame from each station from the lowest-priority
378 * AC that has frames at all.
380 list_for_each_entry_rcu(sta, &local->sta_list, list) {
383 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
384 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
385 total += skb_queue_len(&sta->ps_tx_buf[ac]);
388 ieee80211_free_txskb(&local->hw, skb);
394 local->total_ps_buffered = total;
395 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
398 static ieee80211_tx_result
399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
406 * broadcast/multicast frame
408 * If any of the associated/peer stations is in power save mode,
409 * the frame is buffered to be sent after DTIM beacon frame.
410 * This is done either by the hardware or us.
413 /* powersaving STAs currently only in AP/VLAN/mesh mode */
414 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
415 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
419 ps = &tx->sdata->bss->ps;
420 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
421 ps = &tx->sdata->u.mesh.ps;
427 /* no buffering for ordered frames */
428 if (ieee80211_has_order(hdr->frame_control))
431 if (ieee80211_is_probe_req(hdr->frame_control))
434 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
435 info->hw_queue = tx->sdata->vif.cab_queue;
437 /* no stations in PS mode */
438 if (!atomic_read(&ps->num_sta_ps))
441 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
443 /* device releases frame after DTIM beacon */
444 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
447 /* buffered in mac80211 */
448 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
449 purge_old_ps_buffers(tx->local);
451 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
453 "BC TX buffer full - dropping the oldest frame\n");
454 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
456 tx->local->total_ps_buffered++;
458 skb_queue_tail(&ps->bc_buf, tx->skb);
463 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
466 if (!ieee80211_is_mgmt(fc))
469 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
472 if (!ieee80211_is_robust_mgmt_frame(skb))
478 static ieee80211_tx_result
479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
481 struct sta_info *sta = tx->sta;
482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
484 struct ieee80211_local *local = tx->local;
489 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
490 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
491 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
492 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
493 int ac = skb_get_queue_mapping(tx->skb);
495 if (ieee80211_is_mgmt(hdr->frame_control) &&
496 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
497 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
501 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
502 sta->sta.addr, sta->sta.aid, ac);
503 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
504 purge_old_ps_buffers(tx->local);
506 /* sync with ieee80211_sta_ps_deliver_wakeup */
507 spin_lock(&sta->ps_lock);
509 * STA woke up the meantime and all the frames on ps_tx_buf have
510 * been queued to pending queue. No reordering can happen, go
511 * ahead and Tx the packet.
513 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
514 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
515 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
516 spin_unlock(&sta->ps_lock);
520 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
521 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
525 ieee80211_free_txskb(&local->hw, old);
527 tx->local->total_ps_buffered++;
529 info->control.jiffies = jiffies;
530 info->control.vif = &tx->sdata->vif;
531 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
532 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
533 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
534 spin_unlock(&sta->ps_lock);
536 if (!timer_pending(&local->sta_cleanup))
537 mod_timer(&local->sta_cleanup,
538 round_jiffies(jiffies +
539 STA_INFO_CLEANUP_INTERVAL));
542 * We queued up some frames, so the TIM bit might
543 * need to be set, recalculate it.
545 sta_info_recalc_tim(sta);
548 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
550 "STA %pM in PS mode, but polling/in SP -> send frame\n",
557 static ieee80211_tx_result debug_noinline
558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
560 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
563 if (tx->flags & IEEE80211_TX_UNICAST)
564 return ieee80211_tx_h_unicast_ps_buf(tx);
566 return ieee80211_tx_h_multicast_ps_buf(tx);
569 static ieee80211_tx_result debug_noinline
570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
574 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
575 if (tx->sdata->control_port_no_encrypt)
576 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
577 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
578 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
584 static ieee80211_tx_result debug_noinline
585 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
587 struct ieee80211_key *key;
588 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
589 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
591 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
594 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
596 else if (ieee80211_is_group_privacy_action(tx->skb) &&
597 (key = rcu_dereference(tx->sdata->default_multicast_key)))
599 else if (ieee80211_is_mgmt(hdr->frame_control) &&
600 is_multicast_ether_addr(hdr->addr1) &&
601 ieee80211_is_robust_mgmt_frame(tx->skb) &&
602 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
604 else if (is_multicast_ether_addr(hdr->addr1) &&
605 (key = rcu_dereference(tx->sdata->default_multicast_key)))
607 else if (!is_multicast_ether_addr(hdr->addr1) &&
608 (key = rcu_dereference(tx->sdata->default_unicast_key)))
614 bool skip_hw = false;
616 /* TODO: add threshold stuff again */
618 switch (tx->key->conf.cipher) {
619 case WLAN_CIPHER_SUITE_WEP40:
620 case WLAN_CIPHER_SUITE_WEP104:
621 case WLAN_CIPHER_SUITE_TKIP:
622 if (!ieee80211_is_data_present(hdr->frame_control))
625 case WLAN_CIPHER_SUITE_CCMP:
626 case WLAN_CIPHER_SUITE_CCMP_256:
627 case WLAN_CIPHER_SUITE_GCMP:
628 case WLAN_CIPHER_SUITE_GCMP_256:
629 if (!ieee80211_is_data_present(hdr->frame_control) &&
630 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
632 !ieee80211_is_group_privacy_action(tx->skb))
635 skip_hw = (tx->key->conf.flags &
636 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
637 ieee80211_is_mgmt(hdr->frame_control);
639 case WLAN_CIPHER_SUITE_AES_CMAC:
640 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
641 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
643 if (!ieee80211_is_mgmt(hdr->frame_control))
648 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
649 !ieee80211_is_deauth(hdr->frame_control)))
652 if (!skip_hw && tx->key &&
653 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
654 info->control.hw_key = &tx->key->conf;
660 static ieee80211_tx_result debug_noinline
661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
664 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
665 struct ieee80211_supported_band *sband;
667 struct ieee80211_tx_rate_control txrc;
668 struct ieee80211_sta_rates *ratetbl = NULL;
671 memset(&txrc, 0, sizeof(txrc));
673 sband = tx->local->hw.wiphy->bands[info->band];
675 len = min_t(u32, tx->skb->len + FCS_LEN,
676 tx->local->hw.wiphy->frag_threshold);
678 /* set up the tx rate control struct we give the RC algo */
679 txrc.hw = &tx->local->hw;
681 txrc.bss_conf = &tx->sdata->vif.bss_conf;
683 txrc.reported_rate.idx = -1;
684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
686 if (tx->sdata->rc_has_mcs_mask[info->band])
687 txrc.rate_idx_mcs_mask =
688 tx->sdata->rc_rateidx_mcs_mask[info->band];
690 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
691 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
692 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
693 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
695 /* set up RTS protection if desired */
696 if (len > tx->local->hw.wiphy->rts_threshold) {
700 info->control.use_rts = txrc.rts;
701 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
704 * Use short preamble if the BSS can handle it, but not for
705 * management frames unless we know the receiver can handle
706 * that -- the management frame might be to a station that
707 * just wants a probe response.
709 if (tx->sdata->vif.bss_conf.use_short_preamble &&
710 (ieee80211_is_data(hdr->frame_control) ||
711 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
712 txrc.short_preamble = true;
714 info->control.short_preamble = txrc.short_preamble;
716 /* don't ask rate control when rate already injected via radiotap */
717 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
721 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
724 * Lets not bother rate control if we're associated and cannot
725 * talk to the sta. This should not happen.
727 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
728 !rate_usable_index_exists(sband, &tx->sta->sta),
729 "%s: Dropped data frame as no usable bitrate found while "
730 "scanning and associated. Target station: "
731 "%pM on %d GHz band\n",
732 tx->sdata->name, hdr->addr1,
737 * If we're associated with the sta at this point we know we can at
738 * least send the frame at the lowest bit rate.
740 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
742 if (tx->sta && !info->control.skip_table)
743 ratetbl = rcu_dereference(tx->sta->sta.rates);
745 if (unlikely(info->control.rates[0].idx < 0)) {
747 struct ieee80211_tx_rate rate = {
748 .idx = ratetbl->rate[0].idx,
749 .flags = ratetbl->rate[0].flags,
750 .count = ratetbl->rate[0].count
753 if (ratetbl->rate[0].idx < 0)
761 tx->rate = info->control.rates[0];
764 if (txrc.reported_rate.idx < 0) {
765 txrc.reported_rate = tx->rate;
766 if (tx->sta && ieee80211_is_data(hdr->frame_control))
767 tx->sta->tx_stats.last_rate = txrc.reported_rate;
769 tx->sta->tx_stats.last_rate = txrc.reported_rate;
774 if (unlikely(!info->control.rates[0].count))
775 info->control.rates[0].count = 1;
777 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
778 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
779 info->control.rates[0].count = 1;
784 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
786 u16 *seq = &sta->tid_seq[tid];
787 __le16 ret = cpu_to_le16(*seq);
789 /* Increase the sequence number. */
790 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
795 static ieee80211_tx_result debug_noinline
796 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
798 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
799 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
803 * Packet injection may want to control the sequence
804 * number, if we have no matching interface then we
805 * neither assign one ourselves nor ask the driver to.
807 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
810 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
813 if (ieee80211_hdrlen(hdr->frame_control) < 24)
816 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
820 * Anything but QoS data that has a sequence number field
821 * (is long enough) gets a sequence number from the global
822 * counter. QoS data frames with a multicast destination
823 * also use the global counter (802.11-2012 9.3.2.10).
825 if (!ieee80211_is_data_qos(hdr->frame_control) ||
826 is_multicast_ether_addr(hdr->addr1)) {
827 /* driver should assign sequence number */
828 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
829 /* for pure STA mode without beacons, we can do it */
830 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
831 tx->sdata->sequence_number += 0x10;
833 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
838 * This should be true for injected/management frames only, for
839 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
840 * above since they are not QoS-data frames.
845 /* include per-STA, per-TID sequence counter */
846 tid = ieee80211_get_tid(hdr);
847 tx->sta->tx_stats.msdu[tid]++;
849 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
854 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
855 struct sk_buff *skb, int hdrlen,
858 struct ieee80211_local *local = tx->local;
859 struct ieee80211_tx_info *info;
861 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
862 int pos = hdrlen + per_fragm;
863 int rem = skb->len - hdrlen - per_fragm;
865 if (WARN_ON(rem < 0))
868 /* first fragment was already added to queue by caller */
871 int fraglen = per_fragm;
876 tmp = dev_alloc_skb(local->tx_headroom +
878 tx->sdata->encrypt_headroom +
879 IEEE80211_ENCRYPT_TAILROOM);
883 __skb_queue_tail(&tx->skbs, tmp);
886 local->tx_headroom + tx->sdata->encrypt_headroom);
888 /* copy control information */
889 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
891 info = IEEE80211_SKB_CB(tmp);
892 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
893 IEEE80211_TX_CTL_FIRST_FRAGMENT);
896 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
898 skb_copy_queue_mapping(tmp, skb);
899 tmp->priority = skb->priority;
902 /* copy header and data */
903 skb_put_data(tmp, skb->data, hdrlen);
904 skb_put_data(tmp, skb->data + pos, fraglen);
909 /* adjust first fragment's length */
910 skb_trim(skb, hdrlen + per_fragm);
914 static ieee80211_tx_result debug_noinline
915 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
917 struct sk_buff *skb = tx->skb;
918 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
919 struct ieee80211_hdr *hdr = (void *)skb->data;
920 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
924 /* no matter what happens, tx->skb moves to tx->skbs */
925 __skb_queue_tail(&tx->skbs, skb);
928 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
931 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
935 * Warn when submitting a fragmented A-MPDU frame and drop it.
936 * This scenario is handled in ieee80211_tx_prepare but extra
937 * caution taken here as fragmented ampdu may cause Tx stop.
939 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
942 hdrlen = ieee80211_hdrlen(hdr->frame_control);
944 /* internal error, why isn't DONTFRAG set? */
945 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
949 * Now fragment the frame. This will allocate all the fragments and
950 * chain them (using skb as the first fragment) to skb->next.
951 * During transmission, we will remove the successfully transmitted
952 * fragments from this list. When the low-level driver rejects one
953 * of the fragments then we will simply pretend to accept the skb
954 * but store it away as pending.
956 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
959 /* update duration/seq/flags of fragments */
962 skb_queue_walk(&tx->skbs, skb) {
963 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
965 hdr = (void *)skb->data;
966 info = IEEE80211_SKB_CB(skb);
968 if (!skb_queue_is_last(&tx->skbs, skb)) {
969 hdr->frame_control |= morefrags;
971 * No multi-rate retries for fragmented frames, that
972 * would completely throw off the NAV at other STAs.
974 info->control.rates[1].idx = -1;
975 info->control.rates[2].idx = -1;
976 info->control.rates[3].idx = -1;
977 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
978 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
980 hdr->frame_control &= ~morefrags;
982 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
989 static ieee80211_tx_result debug_noinline
990 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
998 skb_queue_walk(&tx->skbs, skb) {
999 ac = skb_get_queue_mapping(skb);
1000 tx->sta->tx_stats.bytes[ac] += skb->len;
1003 tx->sta->tx_stats.packets[ac]++;
1008 static ieee80211_tx_result debug_noinline
1009 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1014 switch (tx->key->conf.cipher) {
1015 case WLAN_CIPHER_SUITE_WEP40:
1016 case WLAN_CIPHER_SUITE_WEP104:
1017 return ieee80211_crypto_wep_encrypt(tx);
1018 case WLAN_CIPHER_SUITE_TKIP:
1019 return ieee80211_crypto_tkip_encrypt(tx);
1020 case WLAN_CIPHER_SUITE_CCMP:
1021 return ieee80211_crypto_ccmp_encrypt(
1022 tx, IEEE80211_CCMP_MIC_LEN);
1023 case WLAN_CIPHER_SUITE_CCMP_256:
1024 return ieee80211_crypto_ccmp_encrypt(
1025 tx, IEEE80211_CCMP_256_MIC_LEN);
1026 case WLAN_CIPHER_SUITE_AES_CMAC:
1027 return ieee80211_crypto_aes_cmac_encrypt(tx);
1028 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1029 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1030 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1031 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1032 return ieee80211_crypto_aes_gmac_encrypt(tx);
1033 case WLAN_CIPHER_SUITE_GCMP:
1034 case WLAN_CIPHER_SUITE_GCMP_256:
1035 return ieee80211_crypto_gcmp_encrypt(tx);
1037 return ieee80211_crypto_hw_encrypt(tx);
1043 static ieee80211_tx_result debug_noinline
1044 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1046 struct sk_buff *skb;
1047 struct ieee80211_hdr *hdr;
1051 skb_queue_walk(&tx->skbs, skb) {
1052 hdr = (void *) skb->data;
1053 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1054 break; /* must not overwrite AID */
1055 if (!skb_queue_is_last(&tx->skbs, skb)) {
1056 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1057 next_len = next->len;
1060 group_addr = is_multicast_ether_addr(hdr->addr1);
1063 ieee80211_duration(tx, skb, group_addr, next_len);
1069 /* actual transmit path */
1071 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1072 struct sk_buff *skb,
1073 struct ieee80211_tx_info *info,
1074 struct tid_ampdu_tx *tid_tx,
1077 bool queued = false;
1078 bool reset_agg_timer = false;
1079 struct sk_buff *purge_skb = NULL;
1081 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1082 info->flags |= IEEE80211_TX_CTL_AMPDU;
1083 reset_agg_timer = true;
1084 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1086 * nothing -- this aggregation session is being started
1087 * but that might still fail with the driver
1089 } else if (!tx->sta->sta.txq[tid]) {
1090 spin_lock(&tx->sta->lock);
1092 * Need to re-check now, because we may get here
1094 * 1) in the window during which the setup is actually
1095 * already done, but not marked yet because not all
1096 * packets are spliced over to the driver pending
1097 * queue yet -- if this happened we acquire the lock
1098 * either before or after the splice happens, but
1099 * need to recheck which of these cases happened.
1101 * 2) during session teardown, if the OPERATIONAL bit
1102 * was cleared due to the teardown but the pointer
1103 * hasn't been assigned NULL yet (or we loaded it
1104 * before it was assigned) -- in this case it may
1105 * now be NULL which means we should just let the
1106 * packet pass through because splicing the frames
1107 * back is already done.
1109 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1112 /* do nothing, let packet pass through */
1113 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1114 info->flags |= IEEE80211_TX_CTL_AMPDU;
1115 reset_agg_timer = true;
1118 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1119 clear_sta_flag(tx->sta, WLAN_STA_SP);
1120 ps_dbg(tx->sta->sdata,
1121 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1122 tx->sta->sta.addr, tx->sta->sta.aid);
1124 info->control.vif = &tx->sdata->vif;
1125 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1126 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1127 __skb_queue_tail(&tid_tx->pending, skb);
1128 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1129 purge_skb = __skb_dequeue(&tid_tx->pending);
1131 spin_unlock(&tx->sta->lock);
1134 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1137 /* reset session timer */
1138 if (reset_agg_timer && tid_tx->timeout)
1139 tid_tx->last_tx = jiffies;
1146 * pass %NULL for the station if unknown, a valid pointer if known
1147 * or an ERR_PTR() if the station is known not to exist
1149 static ieee80211_tx_result
1150 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1151 struct ieee80211_tx_data *tx,
1152 struct sta_info *sta, struct sk_buff *skb)
1154 struct ieee80211_local *local = sdata->local;
1155 struct ieee80211_hdr *hdr;
1156 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1159 memset(tx, 0, sizeof(*tx));
1163 __skb_queue_head_init(&tx->skbs);
1166 * If this flag is set to true anywhere, and we get here,
1167 * we are doing the needed processing, so remove the flag
1170 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1172 hdr = (struct ieee80211_hdr *) skb->data;
1178 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1179 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1180 if (!tx->sta && sdata->wdev.use_4addr)
1182 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1183 IEEE80211_TX_CTL_INJECTED) ||
1184 tx->sdata->control_port_protocol == tx->skb->protocol) {
1185 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1187 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1188 tx->sta = sta_info_get(sdata, hdr->addr1);
1191 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1192 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1193 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1194 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1195 struct tid_ampdu_tx *tid_tx;
1197 tid = ieee80211_get_tid(hdr);
1199 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1203 queued = ieee80211_tx_prep_agg(tx, skb, info,
1206 if (unlikely(queued))
1211 if (is_multicast_ether_addr(hdr->addr1)) {
1212 tx->flags &= ~IEEE80211_TX_UNICAST;
1213 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1215 tx->flags |= IEEE80211_TX_UNICAST;
1217 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1218 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1219 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1220 info->flags & IEEE80211_TX_CTL_AMPDU)
1221 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1225 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1226 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1227 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1228 ieee80211_check_fast_xmit(tx->sta);
1231 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1236 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1237 struct ieee80211_vif *vif,
1238 struct sta_info *sta,
1239 struct sk_buff *skb)
1241 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1242 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1243 struct ieee80211_txq *txq = NULL;
1245 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1246 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1249 if (!ieee80211_is_data(hdr->frame_control))
1253 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1258 txq = sta->sta.txq[tid];
1266 return to_txq_info(txq);
1269 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1271 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1274 static u32 codel_skb_len_func(const struct sk_buff *skb)
1279 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1281 const struct ieee80211_tx_info *info;
1283 info = (const struct ieee80211_tx_info *)skb->cb;
1284 return info->control.enqueue_time;
1287 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1290 struct ieee80211_local *local;
1291 struct txq_info *txqi;
1293 struct fq_flow *flow;
1296 local = vif_to_sdata(txqi->txq.vif)->local;
1299 if (cvars == &txqi->def_cvars)
1300 flow = &txqi->def_flow;
1302 flow = &fq->flows[cvars - local->cvars];
1304 return fq_flow_dequeue(fq, flow);
1307 static void codel_drop_func(struct sk_buff *skb,
1310 struct ieee80211_local *local;
1311 struct ieee80211_hw *hw;
1312 struct txq_info *txqi;
1315 local = vif_to_sdata(txqi->txq.vif)->local;
1318 ieee80211_free_txskb(hw, skb);
1321 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1323 struct fq_flow *flow)
1325 struct ieee80211_local *local;
1326 struct txq_info *txqi;
1327 struct codel_vars *cvars;
1328 struct codel_params *cparams;
1329 struct codel_stats *cstats;
1331 local = container_of(fq, struct ieee80211_local, fq);
1332 txqi = container_of(tin, struct txq_info, tin);
1333 cstats = &txqi->cstats;
1335 if (txqi->txq.sta) {
1336 struct sta_info *sta = container_of(txqi->txq.sta,
1337 struct sta_info, sta);
1338 cparams = &sta->cparams;
1340 cparams = &local->cparams;
1343 if (flow == &txqi->def_flow)
1344 cvars = &txqi->def_cvars;
1346 cvars = &local->cvars[flow - fq->flows];
1348 return codel_dequeue(txqi,
1354 codel_skb_time_func,
1356 codel_dequeue_func);
1359 static void fq_skb_free_func(struct fq *fq,
1361 struct fq_flow *flow,
1362 struct sk_buff *skb)
1364 struct ieee80211_local *local;
1366 local = container_of(fq, struct ieee80211_local, fq);
1367 ieee80211_free_txskb(&local->hw, skb);
1370 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1373 struct sk_buff *skb)
1375 struct txq_info *txqi;
1377 txqi = container_of(tin, struct txq_info, tin);
1378 return &txqi->def_flow;
1381 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1382 struct txq_info *txqi,
1383 struct sk_buff *skb)
1385 struct fq *fq = &local->fq;
1386 struct fq_tin *tin = &txqi->tin;
1388 ieee80211_set_skb_enqueue_time(skb);
1389 fq_tin_enqueue(fq, tin, skb,
1391 fq_flow_get_default_func);
1394 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1395 struct fq_flow *flow, struct sk_buff *skb,
1398 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1400 return info->control.vif == data;
1403 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1404 struct ieee80211_sub_if_data *sdata)
1406 struct fq *fq = &local->fq;
1407 struct txq_info *txqi;
1409 struct ieee80211_sub_if_data *ap;
1411 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1414 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1419 txqi = to_txq_info(ap->vif.txq);
1422 spin_lock_bh(&fq->lock);
1423 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1425 spin_unlock_bh(&fq->lock);
1428 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1429 struct sta_info *sta,
1430 struct txq_info *txqi, int tid)
1432 fq_tin_init(&txqi->tin);
1433 fq_flow_init(&txqi->def_flow);
1434 codel_vars_init(&txqi->def_cvars);
1435 codel_stats_init(&txqi->cstats);
1436 __skb_queue_head_init(&txqi->frags);
1438 txqi->txq.vif = &sdata->vif;
1441 txqi->txq.sta = &sta->sta;
1442 sta->sta.txq[tid] = &txqi->txq;
1443 txqi->txq.tid = tid;
1444 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1446 sdata->vif.txq = &txqi->txq;
1448 txqi->txq.ac = IEEE80211_AC_BE;
1452 void ieee80211_txq_purge(struct ieee80211_local *local,
1453 struct txq_info *txqi)
1455 struct fq *fq = &local->fq;
1456 struct fq_tin *tin = &txqi->tin;
1458 fq_tin_reset(fq, tin, fq_skb_free_func);
1459 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1462 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1464 struct fq *fq = &local->fq;
1467 bool supp_vht = false;
1468 enum nl80211_band band;
1470 if (!local->ops->wake_tx_queue)
1473 ret = fq_init(fq, 4096);
1478 * If the hardware doesn't support VHT, it is safe to limit the maximum
1479 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1481 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1482 struct ieee80211_supported_band *sband;
1484 sband = local->hw.wiphy->bands[band];
1488 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1492 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1494 codel_params_init(&local->cparams);
1495 local->cparams.interval = MS2TIME(100);
1496 local->cparams.target = MS2TIME(20);
1497 local->cparams.ecn = true;
1499 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1501 if (!local->cvars) {
1502 spin_lock_bh(&fq->lock);
1503 fq_reset(fq, fq_skb_free_func);
1504 spin_unlock_bh(&fq->lock);
1508 for (i = 0; i < fq->flows_cnt; i++)
1509 codel_vars_init(&local->cvars[i]);
1514 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1516 struct fq *fq = &local->fq;
1518 if (!local->ops->wake_tx_queue)
1521 kfree(local->cvars);
1522 local->cvars = NULL;
1524 spin_lock_bh(&fq->lock);
1525 fq_reset(fq, fq_skb_free_func);
1526 spin_unlock_bh(&fq->lock);
1529 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1530 struct ieee80211_sub_if_data *sdata,
1531 struct sta_info *sta,
1532 struct sk_buff *skb)
1534 struct fq *fq = &local->fq;
1535 struct ieee80211_vif *vif;
1536 struct txq_info *txqi;
1538 if (!local->ops->wake_tx_queue ||
1539 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1542 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1543 sdata = container_of(sdata->bss,
1544 struct ieee80211_sub_if_data, u.ap);
1547 txqi = ieee80211_get_txq(local, vif, sta, skb);
1552 spin_lock_bh(&fq->lock);
1553 ieee80211_txq_enqueue(local, txqi, skb);
1554 spin_unlock_bh(&fq->lock);
1556 drv_wake_tx_queue(local, txqi);
1561 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1562 struct ieee80211_vif *vif,
1563 struct ieee80211_sta *sta,
1564 struct sk_buff_head *skbs,
1567 struct ieee80211_tx_control control = {};
1568 struct sk_buff *skb, *tmp;
1569 unsigned long flags;
1571 skb_queue_walk_safe(skbs, skb, tmp) {
1572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1573 int q = info->hw_queue;
1575 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1576 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1577 __skb_unlink(skb, skbs);
1578 ieee80211_free_txskb(&local->hw, skb);
1583 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1584 if (local->queue_stop_reasons[q] ||
1585 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1586 if (unlikely(info->flags &
1587 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1588 if (local->queue_stop_reasons[q] &
1589 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1591 * Drop off-channel frames if queues
1592 * are stopped for any reason other
1593 * than off-channel operation. Never
1596 spin_unlock_irqrestore(
1597 &local->queue_stop_reason_lock,
1599 ieee80211_purge_tx_queue(&local->hw,
1606 * Since queue is stopped, queue up frames for
1607 * later transmission from the tx-pending
1608 * tasklet when the queue is woken again.
1611 skb_queue_splice_init(skbs,
1612 &local->pending[q]);
1614 skb_queue_splice_tail_init(skbs,
1615 &local->pending[q]);
1617 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1622 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1624 info->control.vif = vif;
1627 __skb_unlink(skb, skbs);
1628 drv_tx(local, &control, skb);
1635 * Returns false if the frame couldn't be transmitted but was queued instead.
1637 static bool __ieee80211_tx(struct ieee80211_local *local,
1638 struct sk_buff_head *skbs, int led_len,
1639 struct sta_info *sta, bool txpending)
1641 struct ieee80211_tx_info *info;
1642 struct ieee80211_sub_if_data *sdata;
1643 struct ieee80211_vif *vif;
1644 struct ieee80211_sta *pubsta;
1645 struct sk_buff *skb;
1649 if (WARN_ON(skb_queue_empty(skbs)))
1652 skb = skb_peek(skbs);
1653 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1654 info = IEEE80211_SKB_CB(skb);
1655 sdata = vif_to_sdata(info->control.vif);
1656 if (sta && !sta->uploaded)
1664 switch (sdata->vif.type) {
1665 case NL80211_IFTYPE_MONITOR:
1666 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1670 sdata = rcu_dereference(local->monitor_sdata);
1674 vif->hw_queue[skb_get_queue_mapping(skb)];
1675 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1676 ieee80211_purge_tx_queue(&local->hw, skbs);
1681 case NL80211_IFTYPE_AP_VLAN:
1682 sdata = container_of(sdata->bss,
1683 struct ieee80211_sub_if_data, u.ap);
1690 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1693 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1695 WARN_ON_ONCE(!skb_queue_empty(skbs));
1701 * Invoke TX handlers, return 0 on success and non-zero if the
1702 * frame was dropped or queued.
1704 * The handlers are split into an early and late part. The latter is everything
1705 * that can be sensitive to reordering, and will be deferred to after packets
1706 * are dequeued from the intermediate queues (when they are enabled).
1708 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1710 ieee80211_tx_result res = TX_DROP;
1712 #define CALL_TXH(txh) \
1715 if (res != TX_CONTINUE) \
1719 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1720 CALL_TXH(ieee80211_tx_h_check_assoc);
1721 CALL_TXH(ieee80211_tx_h_ps_buf);
1722 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1723 CALL_TXH(ieee80211_tx_h_select_key);
1724 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1725 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1728 if (unlikely(res == TX_DROP)) {
1729 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1731 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1733 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1735 } else if (unlikely(res == TX_QUEUED)) {
1736 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1744 * Late handlers can be called while the sta lock is held. Handlers that can
1745 * cause packets to be generated will cause deadlock!
1747 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1749 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1750 ieee80211_tx_result res = TX_CONTINUE;
1752 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1753 __skb_queue_tail(&tx->skbs, tx->skb);
1758 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1759 CALL_TXH(ieee80211_tx_h_sequence);
1760 CALL_TXH(ieee80211_tx_h_fragment);
1761 /* handlers after fragment must be aware of tx info fragmentation! */
1762 CALL_TXH(ieee80211_tx_h_stats);
1763 CALL_TXH(ieee80211_tx_h_encrypt);
1764 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1765 CALL_TXH(ieee80211_tx_h_calculate_duration);
1769 if (unlikely(res == TX_DROP)) {
1770 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1772 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1774 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1776 } else if (unlikely(res == TX_QUEUED)) {
1777 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1784 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1786 int r = invoke_tx_handlers_early(tx);
1790 return invoke_tx_handlers_late(tx);
1793 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1794 struct ieee80211_vif *vif, struct sk_buff *skb,
1795 int band, struct ieee80211_sta **sta)
1797 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1798 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1799 struct ieee80211_tx_data tx;
1800 struct sk_buff *skb2;
1802 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1806 info->control.vif = vif;
1807 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1809 if (invoke_tx_handlers(&tx))
1814 *sta = &tx.sta->sta;
1819 /* this function isn't suitable for fragmented data frames */
1820 skb2 = __skb_dequeue(&tx.skbs);
1821 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1822 ieee80211_free_txskb(hw, skb2);
1823 ieee80211_purge_tx_queue(hw, &tx.skbs);
1829 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1832 * Returns false if the frame couldn't be transmitted but was queued instead.
1834 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1835 struct sta_info *sta, struct sk_buff *skb,
1838 struct ieee80211_local *local = sdata->local;
1839 struct ieee80211_tx_data tx;
1840 ieee80211_tx_result res_prepare;
1841 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1845 if (unlikely(skb->len < 10)) {
1850 /* initialises tx */
1852 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1854 if (unlikely(res_prepare == TX_DROP)) {
1855 ieee80211_free_txskb(&local->hw, skb);
1857 } else if (unlikely(res_prepare == TX_QUEUED)) {
1861 /* set up hw_queue value early */
1862 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1863 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1865 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1867 if (invoke_tx_handlers_early(&tx))
1870 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1873 if (!invoke_tx_handlers_late(&tx))
1874 result = __ieee80211_tx(local, &tx.skbs, led_len,
1880 /* device xmit handlers */
1882 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1883 struct sk_buff *skb,
1884 int head_need, bool may_encrypt)
1886 struct ieee80211_local *local = sdata->local;
1889 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1890 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1891 tail_need -= skb_tailroom(skb);
1892 tail_need = max_t(int, tail_need, 0);
1895 if (skb_cloned(skb) &&
1896 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1897 !skb_clone_writable(skb, ETH_HLEN) ||
1898 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1899 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1900 else if (head_need || tail_need)
1901 I802_DEBUG_INC(local->tx_expand_skb_head);
1905 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1906 wiphy_debug(local->hw.wiphy,
1907 "failed to reallocate TX buffer\n");
1914 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1915 struct sta_info *sta, struct sk_buff *skb)
1917 struct ieee80211_local *local = sdata->local;
1918 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1919 struct ieee80211_hdr *hdr;
1923 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1925 headroom = local->tx_headroom;
1927 headroom += sdata->encrypt_headroom;
1928 headroom -= skb_headroom(skb);
1929 headroom = max_t(int, 0, headroom);
1931 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1932 ieee80211_free_txskb(&local->hw, skb);
1936 hdr = (struct ieee80211_hdr *) skb->data;
1937 info->control.vif = &sdata->vif;
1939 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1940 if (ieee80211_is_data(hdr->frame_control) &&
1941 is_unicast_ether_addr(hdr->addr1)) {
1942 if (mesh_nexthop_resolve(sdata, skb))
1943 return; /* skb queued: don't free */
1945 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1949 ieee80211_set_qos_hdr(sdata, skb);
1950 ieee80211_tx(sdata, sta, skb, false);
1953 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1954 struct sk_buff *skb)
1956 struct ieee80211_radiotap_iterator iterator;
1957 struct ieee80211_radiotap_header *rthdr =
1958 (struct ieee80211_radiotap_header *) skb->data;
1959 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1960 struct ieee80211_supported_band *sband =
1961 local->hw.wiphy->bands[info->band];
1962 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1966 bool rate_found = false;
1967 u8 rate_retries = 0;
1969 u8 mcs_known, mcs_flags, mcs_bw;
1971 u8 vht_mcs = 0, vht_nss = 0;
1974 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1975 IEEE80211_TX_CTL_DONTFRAG;
1978 * for every radiotap entry that is present
1979 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1980 * entries present, or -EINVAL on error)
1984 ret = ieee80211_radiotap_iterator_next(&iterator);
1989 /* see if this argument is something we can use */
1990 switch (iterator.this_arg_index) {
1992 * You must take care when dereferencing iterator.this_arg
1993 * for multibyte types... the pointer is not aligned. Use
1994 * get_unaligned((type *)iterator.this_arg) to dereference
1995 * iterator.this_arg for type "type" safely on all arches.
1997 case IEEE80211_RADIOTAP_FLAGS:
1998 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2000 * this indicates that the skb we have been
2001 * handed has the 32-bit FCS CRC at the end...
2002 * we should react to that by snipping it off
2003 * because it will be recomputed and added
2006 if (skb->len < (iterator._max_length + FCS_LEN))
2009 skb_trim(skb, skb->len - FCS_LEN);
2011 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2012 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2013 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2014 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2017 case IEEE80211_RADIOTAP_TX_FLAGS:
2018 txflags = get_unaligned_le16(iterator.this_arg);
2019 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2020 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2023 case IEEE80211_RADIOTAP_RATE:
2024 rate = *iterator.this_arg;
2029 case IEEE80211_RADIOTAP_DATA_RETRIES:
2030 rate_retries = *iterator.this_arg;
2033 case IEEE80211_RADIOTAP_MCS:
2034 mcs_known = iterator.this_arg[0];
2035 mcs_flags = iterator.this_arg[1];
2036 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2040 rate = iterator.this_arg[2];
2041 rate_flags = IEEE80211_TX_RC_MCS;
2043 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2044 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2045 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2047 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2048 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2049 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2050 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2053 case IEEE80211_RADIOTAP_VHT:
2054 vht_known = get_unaligned_le16(iterator.this_arg);
2057 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2058 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2059 (iterator.this_arg[2] &
2060 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2061 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2063 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2064 if (iterator.this_arg[3] == 1)
2066 IEEE80211_TX_RC_40_MHZ_WIDTH;
2067 else if (iterator.this_arg[3] == 4)
2069 IEEE80211_TX_RC_80_MHZ_WIDTH;
2070 else if (iterator.this_arg[3] == 11)
2072 IEEE80211_TX_RC_160_MHZ_WIDTH;
2075 vht_mcs = iterator.this_arg[4] >> 4;
2076 vht_nss = iterator.this_arg[4] & 0xF;
2080 * Please update the file
2081 * Documentation/networking/mac80211-injection.txt
2082 * when parsing new fields here.
2090 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2094 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2096 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2097 info->control.rates[i].idx = -1;
2098 info->control.rates[i].flags = 0;
2099 info->control.rates[i].count = 0;
2102 if (rate_flags & IEEE80211_TX_RC_MCS) {
2103 info->control.rates[0].idx = rate;
2104 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2105 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2108 for (i = 0; i < sband->n_bitrates; i++) {
2109 if (rate * 5 != sband->bitrates[i].bitrate)
2112 info->control.rates[0].idx = i;
2117 if (info->control.rates[0].idx < 0)
2118 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2120 info->control.rates[0].flags = rate_flags;
2121 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2122 local->hw.max_rate_tries);
2126 * remove the radiotap header
2127 * iterator->_max_length was sanity-checked against
2128 * skb->len by iterator init
2130 skb_pull(skb, iterator._max_length);
2135 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2136 struct net_device *dev)
2138 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2139 struct ieee80211_chanctx_conf *chanctx_conf;
2140 struct ieee80211_radiotap_header *prthdr =
2141 (struct ieee80211_radiotap_header *)skb->data;
2142 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2143 struct ieee80211_hdr *hdr;
2144 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2145 struct cfg80211_chan_def *chandef;
2149 /* check for not even having the fixed radiotap header part */
2150 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2151 goto fail; /* too short to be possibly valid */
2153 /* is it a header version we can trust to find length from? */
2154 if (unlikely(prthdr->it_version))
2155 goto fail; /* only version 0 is supported */
2157 /* then there must be a radiotap header with a length we can use */
2158 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2160 /* does the skb contain enough to deliver on the alleged length? */
2161 if (unlikely(skb->len < len_rthdr))
2162 goto fail; /* skb too short for claimed rt header extent */
2165 * fix up the pointers accounting for the radiotap
2166 * header still being in there. We are being given
2167 * a precooked IEEE80211 header so no need for
2170 skb_set_mac_header(skb, len_rthdr);
2172 * these are just fixed to the end of the rt area since we
2173 * don't have any better information and at this point, nobody cares
2175 skb_set_network_header(skb, len_rthdr);
2176 skb_set_transport_header(skb, len_rthdr);
2178 if (skb->len < len_rthdr + 2)
2181 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2182 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2184 if (skb->len < len_rthdr + hdrlen)
2188 * Initialize skb->protocol if the injected frame is a data frame
2189 * carrying a rfc1042 header
2191 if (ieee80211_is_data(hdr->frame_control) &&
2192 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2193 u8 *payload = (u8 *)hdr + hdrlen;
2195 if (ether_addr_equal(payload, rfc1042_header))
2196 skb->protocol = cpu_to_be16((payload[6] << 8) |
2200 memset(info, 0, sizeof(*info));
2202 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2203 IEEE80211_TX_CTL_INJECTED;
2208 * We process outgoing injected frames that have a local address
2209 * we handle as though they are non-injected frames.
2210 * This code here isn't entirely correct, the local MAC address
2211 * isn't always enough to find the interface to use; for proper
2212 * VLAN/WDS support we will need a different mechanism (which
2213 * likely isn't going to be monitor interfaces).
2215 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2217 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2218 if (!ieee80211_sdata_running(tmp_sdata))
2220 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2221 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2222 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2224 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2230 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2231 if (!chanctx_conf) {
2232 tmp_sdata = rcu_dereference(local->monitor_sdata);
2235 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2239 chandef = &chanctx_conf->def;
2240 else if (!local->use_chanctx)
2241 chandef = &local->_oper_chandef;
2246 * Frame injection is not allowed if beaconing is not allowed
2247 * or if we need radar detection. Beaconing is usually not allowed when
2248 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2249 * Passive scan is also used in world regulatory domains where
2250 * your country is not known and as such it should be treated as
2251 * NO TX unless the channel is explicitly allowed in which case
2252 * your current regulatory domain would not have the passive scan
2255 * Since AP mode uses monitor interfaces to inject/TX management
2256 * frames we can make AP mode the exception to this rule once it
2257 * supports radar detection as its implementation can deal with
2258 * radar detection by itself. We can do that later by adding a
2259 * monitor flag interfaces used for AP support.
2261 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2265 info->band = chandef->chan->band;
2267 /* process and remove the injection radiotap header */
2268 if (!ieee80211_parse_tx_radiotap(local, skb))
2271 ieee80211_xmit(sdata, NULL, skb);
2274 return NETDEV_TX_OK;
2280 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2283 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2285 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2287 return ethertype == ETH_P_TDLS &&
2289 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2292 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2293 struct sk_buff *skb,
2294 struct sta_info **sta_out)
2296 struct sta_info *sta;
2298 switch (sdata->vif.type) {
2299 case NL80211_IFTYPE_AP_VLAN:
2300 sta = rcu_dereference(sdata->u.vlan.sta);
2304 } else if (sdata->wdev.use_4addr) {
2308 case NL80211_IFTYPE_AP:
2309 case NL80211_IFTYPE_OCB:
2310 case NL80211_IFTYPE_ADHOC:
2311 if (is_multicast_ether_addr(skb->data)) {
2312 *sta_out = ERR_PTR(-ENOENT);
2315 sta = sta_info_get_bss(sdata, skb->data);
2317 case NL80211_IFTYPE_WDS:
2318 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2320 #ifdef CONFIG_MAC80211_MESH
2321 case NL80211_IFTYPE_MESH_POINT:
2322 /* determined much later */
2326 case NL80211_IFTYPE_STATION:
2327 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2328 sta = sta_info_get(sdata, skb->data);
2329 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2330 if (test_sta_flag(sta,
2331 WLAN_STA_TDLS_PEER_AUTH)) {
2337 * TDLS link during setup - throw out frames to
2338 * peer. Allow TDLS-setup frames to unauthorized
2339 * peers for the special case of a link teardown
2340 * after a TDLS sta is removed due to being
2343 if (!ieee80211_is_tdls_setup(skb))
2349 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2357 *sta_out = sta ?: ERR_PTR(-ENOENT);
2362 * ieee80211_build_hdr - build 802.11 header in the given frame
2363 * @sdata: virtual interface to build the header for
2364 * @skb: the skb to build the header in
2365 * @info_flags: skb flags to set
2367 * This function takes the skb with 802.3 header and reformats the header to
2368 * the appropriate IEEE 802.11 header based on which interface the packet is
2369 * being transmitted on.
2371 * Note that this function also takes care of the TX status request and
2372 * potential unsharing of the SKB - this needs to be interleaved with the
2375 * The function requires the read-side RCU lock held
2377 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2379 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2380 struct sk_buff *skb, u32 info_flags,
2381 struct sta_info *sta)
2383 struct ieee80211_local *local = sdata->local;
2384 struct ieee80211_tx_info *info;
2386 u16 ethertype, hdrlen, meshhdrlen = 0;
2388 struct ieee80211_hdr hdr;
2389 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2390 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2391 const u8 *encaps_data;
2392 int encaps_len, skip_header_bytes;
2393 bool wme_sta = false, authorized = false;
2397 struct ieee80211_chanctx_conf *chanctx_conf;
2398 struct ieee80211_sub_if_data *ap_sdata;
2399 enum nl80211_band band;
2405 /* convert Ethernet header to proper 802.11 header (based on
2406 * operation mode) */
2407 ethertype = (skb->data[12] << 8) | skb->data[13];
2408 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2410 switch (sdata->vif.type) {
2411 case NL80211_IFTYPE_AP_VLAN:
2412 if (sdata->wdev.use_4addr) {
2413 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2415 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2416 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2417 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2418 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2420 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2421 wme_sta = sta->sta.wme;
2423 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2425 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2426 if (!chanctx_conf) {
2430 band = chanctx_conf->def.chan->band;
2431 if (sdata->wdev.use_4addr)
2434 case NL80211_IFTYPE_AP:
2435 if (sdata->vif.type == NL80211_IFTYPE_AP)
2436 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2437 if (!chanctx_conf) {
2441 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2443 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2444 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2445 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2447 band = chanctx_conf->def.chan->band;
2449 case NL80211_IFTYPE_WDS:
2450 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2452 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2453 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2454 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2455 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2458 * This is the exception! WDS style interfaces are prohibited
2459 * when channel contexts are in used so this must be valid
2461 band = local->hw.conf.chandef.chan->band;
2463 #ifdef CONFIG_MAC80211_MESH
2464 case NL80211_IFTYPE_MESH_POINT:
2465 if (!is_multicast_ether_addr(skb->data)) {
2466 struct sta_info *next_hop;
2467 bool mpp_lookup = true;
2469 mpath = mesh_path_lookup(sdata, skb->data);
2472 next_hop = rcu_dereference(mpath->next_hop);
2474 !(mpath->flags & (MESH_PATH_ACTIVE |
2475 MESH_PATH_RESOLVING)))
2480 mppath = mpp_path_lookup(sdata, skb->data);
2482 mppath->exp_time = jiffies;
2485 if (mppath && mpath)
2486 mesh_path_del(sdata, mpath->dst);
2490 * Use address extension if it is a packet from
2491 * another interface or if we know the destination
2492 * is being proxied by a portal (i.e. portal address
2493 * differs from proxied address)
2495 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2496 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2497 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2498 skb->data, skb->data + ETH_ALEN);
2499 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2502 /* DS -> MBSS (802.11-2012 13.11.3.3).
2503 * For unicast with unknown forwarding information,
2504 * destination might be in the MBSS or if that fails
2505 * forwarded to another mesh gate. In either case
2506 * resolution will be handled in ieee80211_xmit(), so
2507 * leave the original DA. This also works for mcast */
2508 const u8 *mesh_da = skb->data;
2511 mesh_da = mppath->mpp;
2513 mesh_da = mpath->dst;
2515 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2516 mesh_da, sdata->vif.addr);
2517 if (is_multicast_ether_addr(mesh_da))
2518 /* DA TA mSA AE:SA */
2519 meshhdrlen = ieee80211_new_mesh_header(
2521 skb->data + ETH_ALEN, NULL);
2523 /* RA TA mDA mSA AE:DA SA */
2524 meshhdrlen = ieee80211_new_mesh_header(
2525 sdata, &mesh_hdr, skb->data,
2526 skb->data + ETH_ALEN);
2529 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2530 if (!chanctx_conf) {
2534 band = chanctx_conf->def.chan->band;
2537 case NL80211_IFTYPE_STATION:
2538 /* we already did checks when looking up the RA STA */
2539 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2543 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2544 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2545 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2547 } else if (sdata->u.mgd.use_4addr &&
2548 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2549 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2550 IEEE80211_FCTL_TODS);
2552 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2553 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2554 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2555 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2558 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2560 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2561 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2562 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2565 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2566 if (!chanctx_conf) {
2570 band = chanctx_conf->def.chan->band;
2572 case NL80211_IFTYPE_OCB:
2574 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2575 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2576 eth_broadcast_addr(hdr.addr3);
2578 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2579 if (!chanctx_conf) {
2583 band = chanctx_conf->def.chan->band;
2585 case NL80211_IFTYPE_ADHOC:
2587 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2588 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2589 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2591 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2592 if (!chanctx_conf) {
2596 band = chanctx_conf->def.chan->band;
2603 multicast = is_multicast_ether_addr(hdr.addr1);
2605 /* sta is always NULL for mesh */
2607 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2608 wme_sta = sta->sta.wme;
2609 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2610 /* For mesh, the use of the QoS header is mandatory */
2614 /* receiver does QoS (which also means we do) use it */
2616 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2621 * Drop unicast frames to unauthorised stations unless they are
2622 * EAPOL frames from the local station.
2624 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2625 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2626 !multicast && !authorized &&
2627 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2628 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2629 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2630 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2631 sdata->name, hdr.addr1);
2634 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2640 if (unlikely(!multicast && skb->sk &&
2641 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2642 struct sk_buff *ack_skb = skb_clone_sk(skb);
2645 unsigned long flags;
2648 spin_lock_irqsave(&local->ack_status_lock, flags);
2649 id = idr_alloc(&local->ack_status_frames, ack_skb,
2650 1, 0x10000, GFP_ATOMIC);
2651 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2655 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2663 * If the skb is shared we need to obtain our own copy.
2665 if (skb_shared(skb)) {
2666 struct sk_buff *tmp_skb = skb;
2668 /* can't happen -- skb is a clone if info_id != 0 */
2671 skb = skb_clone(skb, GFP_ATOMIC);
2680 hdr.frame_control = fc;
2681 hdr.duration_id = 0;
2684 skip_header_bytes = ETH_HLEN;
2685 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2686 encaps_data = bridge_tunnel_header;
2687 encaps_len = sizeof(bridge_tunnel_header);
2688 skip_header_bytes -= 2;
2689 } else if (ethertype >= ETH_P_802_3_MIN) {
2690 encaps_data = rfc1042_header;
2691 encaps_len = sizeof(rfc1042_header);
2692 skip_header_bytes -= 2;
2698 skb_pull(skb, skip_header_bytes);
2699 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2702 * So we need to modify the skb header and hence need a copy of
2703 * that. The head_need variable above doesn't, so far, include
2704 * the needed header space that we don't need right away. If we
2705 * can, then we don't reallocate right now but only after the
2706 * frame arrives at the master device (if it does...)
2708 * If we cannot, however, then we will reallocate to include all
2709 * the ever needed space. Also, if we need to reallocate it anyway,
2710 * make it big enough for everything we may ever need.
2713 if (head_need > 0 || skb_cloned(skb)) {
2714 head_need += sdata->encrypt_headroom;
2715 head_need += local->tx_headroom;
2716 head_need = max_t(int, 0, head_need);
2717 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2718 ieee80211_free_txskb(&local->hw, skb);
2720 return ERR_PTR(-ENOMEM);
2725 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2727 #ifdef CONFIG_MAC80211_MESH
2729 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2732 if (ieee80211_is_data_qos(fc)) {
2733 __le16 *qos_control;
2735 qos_control = skb_push(skb, 2);
2736 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2738 * Maybe we could actually set some fields here, for now just
2739 * initialise to zero to indicate no special operation.
2743 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2745 skb_reset_mac_header(skb);
2747 info = IEEE80211_SKB_CB(skb);
2748 memset(info, 0, sizeof(*info));
2750 info->flags = info_flags;
2751 info->ack_frame_id = info_id;
2757 return ERR_PTR(ret);
2761 * fast-xmit overview
2763 * The core idea of this fast-xmit is to remove per-packet checks by checking
2764 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2765 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2766 * much less work can be done per packet. For example, fragmentation must be
2767 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2770 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2771 * header and other data to aid packet processing in ieee80211_xmit_fast().
2773 * The most difficult part of this is that when any of these assumptions
2774 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2775 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2776 * since the per-packet code no longer checks the conditions. This is reflected
2777 * by the calls to these functions throughout the rest of the code, and must be
2778 * maintained if any of the TX path checks change.
2781 void ieee80211_check_fast_xmit(struct sta_info *sta)
2783 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2784 struct ieee80211_local *local = sta->local;
2785 struct ieee80211_sub_if_data *sdata = sta->sdata;
2786 struct ieee80211_hdr *hdr = (void *)build.hdr;
2787 struct ieee80211_chanctx_conf *chanctx_conf;
2790 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2793 /* Locking here protects both the pointer itself, and against concurrent
2794 * invocations winning data access races to, e.g., the key pointer that
2796 * Without it, the invocation of this function right after the key
2797 * pointer changes wouldn't be sufficient, as another CPU could access
2798 * the pointer, then stall, and then do the cache update after the CPU
2799 * that invalidated the key.
2800 * With the locking, such scenarios cannot happen as the check for the
2801 * key and the fast-tx assignment are done atomically, so the CPU that
2802 * modifies the key will either wait or other one will see the key
2803 * cleared/changed already.
2805 spin_lock_bh(&sta->lock);
2806 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2807 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2808 sdata->vif.type == NL80211_IFTYPE_STATION)
2811 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2814 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2815 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2816 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2817 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2820 if (sdata->noack_map)
2823 /* fast-xmit doesn't handle fragmentation at all */
2824 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2825 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2829 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2830 if (!chanctx_conf) {
2834 build.band = chanctx_conf->def.chan->band;
2837 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2839 switch (sdata->vif.type) {
2840 case NL80211_IFTYPE_ADHOC:
2842 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2843 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2844 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2847 case NL80211_IFTYPE_STATION:
2848 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2850 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2851 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2852 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2857 if (sdata->u.mgd.use_4addr) {
2858 /* non-regular ethertype cannot use the fastpath */
2859 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2860 IEEE80211_FCTL_TODS);
2862 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2863 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2864 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2865 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2869 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2871 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2872 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2873 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2876 case NL80211_IFTYPE_AP_VLAN:
2877 if (sdata->wdev.use_4addr) {
2878 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2879 IEEE80211_FCTL_TODS);
2881 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2882 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2883 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2884 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2889 case NL80211_IFTYPE_AP:
2890 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2892 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2893 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2894 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2898 /* not handled on fast-xmit */
2904 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2907 /* We store the key here so there's no point in using rcu_dereference()
2908 * but that's fine because the code that changes the pointers will call
2909 * this function after doing so. For a single CPU that would be enough,
2910 * for multiple see the comment above.
2912 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2914 build.key = rcu_access_pointer(sdata->default_unicast_key);
2916 bool gen_iv, iv_spc, mmic;
2918 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2919 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2920 mmic = build.key->conf.flags &
2921 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
2922 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
2924 /* don't handle software crypto */
2925 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2928 switch (build.key->conf.cipher) {
2929 case WLAN_CIPHER_SUITE_CCMP:
2930 case WLAN_CIPHER_SUITE_CCMP_256:
2931 /* add fixed key ID */
2933 (build.hdr + build.hdr_len)[3] =
2934 0x20 | (build.key->conf.keyidx << 6);
2935 build.pn_offs = build.hdr_len;
2937 if (gen_iv || iv_spc)
2938 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2940 case WLAN_CIPHER_SUITE_GCMP:
2941 case WLAN_CIPHER_SUITE_GCMP_256:
2942 /* add fixed key ID */
2944 (build.hdr + build.hdr_len)[3] =
2945 0x20 | (build.key->conf.keyidx << 6);
2946 build.pn_offs = build.hdr_len;
2948 if (gen_iv || iv_spc)
2949 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2951 case WLAN_CIPHER_SUITE_TKIP:
2952 /* cannot handle MMIC or IV generation in xmit-fast */
2956 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2958 case WLAN_CIPHER_SUITE_WEP40:
2959 case WLAN_CIPHER_SUITE_WEP104:
2960 /* cannot handle IV generation in fast-xmit */
2964 build.hdr_len += IEEE80211_WEP_IV_LEN;
2966 case WLAN_CIPHER_SUITE_AES_CMAC:
2967 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2968 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2969 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2971 "management cipher suite 0x%x enabled for data\n",
2972 build.key->conf.cipher);
2975 /* we don't know how to generate IVs for this at all */
2976 if (WARN_ON(gen_iv))
2978 /* pure hardware keys are OK, of course */
2979 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2981 /* cipher scheme might require space allocation */
2983 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2986 build.hdr_len += build.key->conf.iv_len;
2989 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2992 hdr->frame_control = fc;
2994 memcpy(build.hdr + build.hdr_len,
2995 rfc1042_header, sizeof(rfc1042_header));
2996 build.hdr_len += sizeof(rfc1042_header);
2998 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2999 /* if the kmemdup fails, continue w/o fast_tx */
3004 /* we might have raced against another call to this function */
3005 old = rcu_dereference_protected(sta->fast_tx,
3006 lockdep_is_held(&sta->lock));
3007 rcu_assign_pointer(sta->fast_tx, fast_tx);
3009 kfree_rcu(old, rcu_head);
3010 spin_unlock_bh(&sta->lock);
3013 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3015 struct sta_info *sta;
3018 list_for_each_entry_rcu(sta, &local->sta_list, list)
3019 ieee80211_check_fast_xmit(sta);
3023 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3025 struct ieee80211_local *local = sdata->local;
3026 struct sta_info *sta;
3030 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3031 if (sdata != sta->sdata &&
3032 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3034 ieee80211_check_fast_xmit(sta);
3040 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3042 struct ieee80211_fast_tx *fast_tx;
3044 spin_lock_bh(&sta->lock);
3045 fast_tx = rcu_dereference_protected(sta->fast_tx,
3046 lockdep_is_held(&sta->lock));
3047 RCU_INIT_POINTER(sta->fast_tx, NULL);
3048 spin_unlock_bh(&sta->lock);
3051 kfree_rcu(fast_tx, rcu_head);
3054 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3055 struct sk_buff *skb, int headroom,
3058 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3059 int padding = (4 - amsdu_len) & 3;
3061 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3062 I802_DEBUG_INC(local->tx_expand_skb_head);
3064 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3065 wiphy_debug(local->hw.wiphy,
3066 "failed to reallocate TX buffer\n");
3072 *subframe_len += padding;
3073 skb_put_zero(skb, padding);
3079 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3080 struct ieee80211_fast_tx *fast_tx,
3081 struct sk_buff *skb)
3083 struct ieee80211_local *local = sdata->local;
3084 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3085 struct ieee80211_hdr *hdr;
3086 struct ethhdr *amsdu_hdr;
3087 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3088 int subframe_len = skb->len - hdr_len;
3090 u8 *qc, *h_80211_src, *h_80211_dst;
3093 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3096 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3099 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr),
3103 data = skb_push(skb, sizeof(*amsdu_hdr));
3104 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3106 amsdu_hdr = data + hdr_len;
3107 /* h_80211_src/dst is addr* field within hdr */
3108 h_80211_src = data + fast_tx->sa_offs;
3109 h_80211_dst = data + fast_tx->da_offs;
3111 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3112 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3113 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3115 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3116 * fields needs to be changed to BSSID for A-MSDU frames depending
3117 * on FromDS/ToDS values.
3119 switch (sdata->vif.type) {
3120 case NL80211_IFTYPE_STATION:
3121 bssid = sdata->u.mgd.bssid;
3123 case NL80211_IFTYPE_AP:
3124 case NL80211_IFTYPE_AP_VLAN:
3125 bssid = sdata->vif.addr;
3131 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3132 ether_addr_copy(h_80211_src, bssid);
3134 if (bssid && ieee80211_has_tods(hdr->frame_control))
3135 ether_addr_copy(h_80211_dst, bssid);
3137 qc = ieee80211_get_qos_ctl(hdr);
3138 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3140 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3145 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3146 struct sta_info *sta,
3147 struct ieee80211_fast_tx *fast_tx,
3148 struct sk_buff *skb)
3150 struct ieee80211_local *local = sdata->local;
3151 struct fq *fq = &local->fq;
3153 struct fq_flow *flow;
3154 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3155 struct ieee80211_txq *txq = sta->sta.txq[tid];
3156 struct txq_info *txqi;
3157 struct sk_buff **frag_tail, *head;
3158 int subframe_len = skb->len - ETH_ALEN;
3159 u8 max_subframes = sta->sta.max_amsdu_subframes;
3160 int max_frags = local->hw.max_tx_fragments;
3161 int max_amsdu_len = sta->sta.max_amsdu_len;
3165 unsigned int orig_len;
3168 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3174 txqi = to_txq_info(txq);
3175 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3178 if (sta->sta.max_rc_amsdu_len)
3179 max_amsdu_len = min_t(int, max_amsdu_len,
3180 sta->sta.max_rc_amsdu_len);
3182 spin_lock_bh(&fq->lock);
3184 /* TODO: Ideally aggregation should be done on dequeue to remain
3185 * responsive to environment changes.
3189 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3190 head = skb_peek_tail(&flow->queue);
3194 orig_len = head->len;
3196 if (skb->len + head->len > max_amsdu_len)
3199 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3202 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3203 nfrags += 1 + skb_shinfo(head)->nr_frags;
3204 frag_tail = &skb_shinfo(head)->frag_list;
3205 while (*frag_tail) {
3206 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3207 frag_tail = &(*frag_tail)->next;
3211 if (max_subframes && n > max_subframes)
3214 if (max_frags && nfrags > max_frags)
3217 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3222 data = skb_push(skb, ETH_ALEN + 2);
3223 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3225 data += 2 * ETH_ALEN;
3226 len = cpu_to_be16(subframe_len);
3227 memcpy(data, &len, 2);
3228 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3230 head->len += skb->len;
3231 head->data_len += skb->len;
3234 flow->backlog += head->len - orig_len;
3235 tin->backlog_bytes += head->len - orig_len;
3237 fq_recalc_backlog(fq, tin, flow);
3240 spin_unlock_bh(&fq->lock);
3246 * Can be called while the sta lock is held. Anything that can cause packets to
3247 * be generated will cause deadlock!
3249 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3250 struct sta_info *sta, u8 pn_offs,
3251 struct ieee80211_key *key,
3252 struct sk_buff *skb)
3254 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3255 struct ieee80211_hdr *hdr = (void *)skb->data;
3256 u8 tid = IEEE80211_NUM_TIDS;
3259 info->control.hw_key = &key->conf;
3261 ieee80211_tx_stats(skb->dev, skb->len);
3263 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3264 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3265 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3267 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3268 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3269 sdata->sequence_number += 0x10;
3272 if (skb_shinfo(skb)->gso_size)
3273 sta->tx_stats.msdu[tid] +=
3274 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3276 sta->tx_stats.msdu[tid]++;
3278 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3280 /* statistics normally done by ieee80211_tx_h_stats (but that
3281 * has to consider fragmentation, so is more complex)
3283 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3284 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3288 u8 *crypto_hdr = skb->data + pn_offs;
3290 switch (key->conf.cipher) {
3291 case WLAN_CIPHER_SUITE_CCMP:
3292 case WLAN_CIPHER_SUITE_CCMP_256:
3293 case WLAN_CIPHER_SUITE_GCMP:
3294 case WLAN_CIPHER_SUITE_GCMP_256:
3295 pn = atomic64_inc_return(&key->conf.tx_pn);
3297 crypto_hdr[1] = pn >> 8;
3298 crypto_hdr[4] = pn >> 16;
3299 crypto_hdr[5] = pn >> 24;
3300 crypto_hdr[6] = pn >> 32;
3301 crypto_hdr[7] = pn >> 40;
3307 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3308 struct sta_info *sta,
3309 struct ieee80211_fast_tx *fast_tx,
3310 struct sk_buff *skb)
3312 struct ieee80211_local *local = sdata->local;
3313 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3314 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3315 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3317 struct ieee80211_tx_info *info;
3318 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3319 struct ieee80211_tx_data tx;
3320 ieee80211_tx_result r;
3321 struct tid_ampdu_tx *tid_tx = NULL;
3322 u8 tid = IEEE80211_NUM_TIDS;
3324 /* control port protocol needs a lot of special handling */
3325 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3328 /* only RFC 1042 SNAP */
3329 if (ethertype < ETH_P_802_3_MIN)
3332 /* don't handle TX status request here either */
3333 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3336 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3337 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3338 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3340 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3342 if (tid_tx->timeout)
3343 tid_tx->last_tx = jiffies;
3347 /* after this point (skb is modified) we cannot return false */
3349 if (skb_shared(skb)) {
3350 struct sk_buff *tmp_skb = skb;
3352 skb = skb_clone(skb, GFP_ATOMIC);
3359 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3360 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3363 /* will not be crypto-handled beyond what we do here, so use false
3364 * as the may-encrypt argument for the resize to not account for
3365 * more room than we already have in 'extra_head'
3367 if (unlikely(ieee80211_skb_resize(sdata, skb,
3368 max_t(int, extra_head + hw_headroom -
3369 skb_headroom(skb), 0),
3375 memcpy(ð, skb->data, ETH_HLEN - 2);
3376 hdr = skb_push(skb, extra_head);
3377 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3378 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3379 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3381 info = IEEE80211_SKB_CB(skb);
3382 memset(info, 0, sizeof(*info));
3383 info->band = fast_tx->band;
3384 info->control.vif = &sdata->vif;
3385 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3386 IEEE80211_TX_CTL_DONTFRAG |
3387 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3388 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3390 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3391 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3392 *ieee80211_get_qos_ctl(hdr) = tid;
3395 __skb_queue_head_init(&tx.skbs);
3397 tx.flags = IEEE80211_TX_UNICAST;
3401 tx.key = fast_tx->key;
3403 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3405 r = ieee80211_tx_h_rate_ctrl(&tx);
3409 if (r != TX_CONTINUE) {
3416 if (ieee80211_queue_skb(local, sdata, sta, skb))
3419 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3422 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3423 sdata = container_of(sdata->bss,
3424 struct ieee80211_sub_if_data, u.ap);
3426 __skb_queue_tail(&tx.skbs, skb);
3427 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3431 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3432 struct ieee80211_txq *txq)
3434 struct ieee80211_local *local = hw_to_local(hw);
3435 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3436 struct ieee80211_hdr *hdr;
3437 struct sk_buff *skb = NULL;
3438 struct fq *fq = &local->fq;
3439 struct fq_tin *tin = &txqi->tin;
3440 struct ieee80211_tx_info *info;
3441 struct ieee80211_tx_data tx;
3442 ieee80211_tx_result r;
3443 struct ieee80211_vif *vif;
3445 spin_lock_bh(&fq->lock);
3447 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3450 /* Make sure fragments stay together. */
3451 skb = __skb_dequeue(&txqi->frags);
3456 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3460 hdr = (struct ieee80211_hdr *)skb->data;
3461 info = IEEE80211_SKB_CB(skb);
3463 memset(&tx, 0, sizeof(tx));
3464 __skb_queue_head_init(&tx.skbs);
3467 tx.sdata = vif_to_sdata(info->control.vif);
3470 tx.sta = container_of(txq->sta, struct sta_info, sta);
3473 * The key can be removed while the packet was queued, so need to call
3474 * this here to get the current key.
3476 r = ieee80211_tx_h_select_key(&tx);
3477 if (r != TX_CONTINUE) {
3478 ieee80211_free_txskb(&local->hw, skb);
3482 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3483 info->flags |= IEEE80211_TX_CTL_AMPDU;
3485 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3487 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3488 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3493 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3494 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3496 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3499 if (invoke_tx_handlers_late(&tx))
3502 skb = __skb_dequeue(&tx.skbs);
3504 if (!skb_queue_empty(&tx.skbs))
3505 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3508 if (skb && skb_has_frag_list(skb) &&
3509 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3510 if (skb_linearize(skb)) {
3511 ieee80211_free_txskb(&local->hw, skb);
3516 switch (tx.sdata->vif.type) {
3517 case NL80211_IFTYPE_MONITOR:
3518 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3519 vif = &tx.sdata->vif;
3522 tx.sdata = rcu_dereference(local->monitor_sdata);
3524 vif = &tx.sdata->vif;
3526 vif->hw_queue[skb_get_queue_mapping(skb)];
3527 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3528 ieee80211_free_txskb(&local->hw, skb);
3534 case NL80211_IFTYPE_AP_VLAN:
3535 tx.sdata = container_of(tx.sdata->bss,
3536 struct ieee80211_sub_if_data, u.ap);
3539 vif = &tx.sdata->vif;
3543 IEEE80211_SKB_CB(skb)->control.vif = vif;
3545 spin_unlock_bh(&fq->lock);
3549 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3551 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3552 struct net_device *dev,
3555 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3556 struct sta_info *sta;
3557 struct sk_buff *next;
3559 if (unlikely(skb->len < ETH_HLEN)) {
3566 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3569 if (!IS_ERR_OR_NULL(sta)) {
3570 struct ieee80211_fast_tx *fast_tx;
3572 fast_tx = rcu_dereference(sta->fast_tx);
3575 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3579 if (skb_is_gso(skb)) {
3580 struct sk_buff *segs;
3582 segs = skb_gso_segment(skb, 0);
3590 /* we cannot process non-linear frames on this path */
3591 if (skb_linearize(skb)) {
3596 /* the frame could be fragmented, software-encrypted, and other
3597 * things so we cannot really handle checksum offload with it -
3598 * fix it up in software before we handle anything else.
3600 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3601 skb_set_transport_header(skb,
3602 skb_checksum_start_offset(skb));
3603 if (skb_checksum_help(skb))
3616 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3620 ieee80211_tx_stats(dev, skb->len);
3622 ieee80211_xmit(sdata, sta, skb);
3631 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3636 err = skb_ensure_writable(skb, ETH_HLEN);
3640 eth = (void *)skb->data;
3641 ether_addr_copy(eth->h_dest, sta->sta.addr);
3646 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3647 struct net_device *dev)
3649 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3650 const struct ethhdr *eth = (void *)skb->data;
3651 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3654 if (likely(!is_multicast_ether_addr(eth->h_dest)))
3657 switch (sdata->vif.type) {
3658 case NL80211_IFTYPE_AP_VLAN:
3659 if (sdata->u.vlan.sta)
3661 if (sdata->wdev.use_4addr)
3664 case NL80211_IFTYPE_AP:
3665 /* check runtime toggle for this bss */
3666 if (!sdata->bss->multicast_to_unicast)
3673 /* multicast to unicast conversion only for some payload */
3674 ethertype = eth->h_proto;
3675 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3676 ethertype = ethvlan->h_vlan_encapsulated_proto;
3677 switch (ethertype) {
3678 case htons(ETH_P_ARP):
3679 case htons(ETH_P_IP):
3680 case htons(ETH_P_IPV6):
3690 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3691 struct sk_buff_head *queue)
3693 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3694 struct ieee80211_local *local = sdata->local;
3695 const struct ethhdr *eth = (struct ethhdr *)skb->data;
3696 struct sta_info *sta, *first = NULL;
3697 struct sk_buff *cloned_skb;
3701 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3702 if (sdata != sta->sdata)
3703 /* AP-VLAN mismatch */
3705 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3706 /* do not send back to source */
3712 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3715 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3716 dev_kfree_skb(cloned_skb);
3719 __skb_queue_tail(queue, cloned_skb);
3722 if (likely(first)) {
3723 if (unlikely(ieee80211_change_da(skb, first)))
3725 __skb_queue_tail(queue, skb);
3727 /* no STA connected, drop */
3734 __skb_queue_purge(queue);
3735 __skb_queue_tail(queue, skb);
3741 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3742 * @skb: packet to be sent
3743 * @dev: incoming interface
3745 * On failure skb will be freed.
3747 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3748 struct net_device *dev)
3750 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3751 struct sk_buff_head queue;
3753 __skb_queue_head_init(&queue);
3754 ieee80211_convert_to_unicast(skb, dev, &queue);
3755 while ((skb = __skb_dequeue(&queue)))
3756 __ieee80211_subif_start_xmit(skb, dev, 0);
3758 __ieee80211_subif_start_xmit(skb, dev, 0);
3761 return NETDEV_TX_OK;
3765 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3766 struct sk_buff *skb, u32 info_flags)
3768 struct ieee80211_hdr *hdr;
3769 struct ieee80211_tx_data tx = {
3770 .local = sdata->local,
3773 struct sta_info *sta;
3777 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3779 skb = ERR_PTR(-EINVAL);
3783 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3787 hdr = (void *)skb->data;
3788 tx.sta = sta_info_get(sdata, hdr->addr1);
3791 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3794 return ERR_PTR(-EINVAL);
3803 * ieee80211_clear_tx_pending may not be called in a context where
3804 * it is possible that it packets could come in again.
3806 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3808 struct sk_buff *skb;
3811 for (i = 0; i < local->hw.queues; i++) {
3812 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3813 ieee80211_free_txskb(&local->hw, skb);
3818 * Returns false if the frame couldn't be transmitted but was queued instead,
3819 * which in this case means re-queued -- take as an indication to stop sending
3820 * more pending frames.
3822 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3823 struct sk_buff *skb)
3825 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3826 struct ieee80211_sub_if_data *sdata;
3827 struct sta_info *sta;
3828 struct ieee80211_hdr *hdr;
3830 struct ieee80211_chanctx_conf *chanctx_conf;
3832 sdata = vif_to_sdata(info->control.vif);
3834 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3835 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3836 if (unlikely(!chanctx_conf)) {
3840 info->band = chanctx_conf->def.chan->band;
3841 result = ieee80211_tx(sdata, NULL, skb, true);
3843 struct sk_buff_head skbs;
3845 __skb_queue_head_init(&skbs);
3846 __skb_queue_tail(&skbs, skb);
3848 hdr = (struct ieee80211_hdr *)skb->data;
3849 sta = sta_info_get(sdata, hdr->addr1);
3851 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3858 * Transmit all pending packets. Called from tasklet.
3860 void ieee80211_tx_pending(unsigned long data)
3862 struct ieee80211_local *local = (struct ieee80211_local *)data;
3863 unsigned long flags;
3869 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3870 for (i = 0; i < local->hw.queues; i++) {
3872 * If queue is stopped by something other than due to pending
3873 * frames, or we have no pending frames, proceed to next queue.
3875 if (local->queue_stop_reasons[i] ||
3876 skb_queue_empty(&local->pending[i]))
3879 while (!skb_queue_empty(&local->pending[i])) {
3880 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3881 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3883 if (WARN_ON(!info->control.vif)) {
3884 ieee80211_free_txskb(&local->hw, skb);
3888 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3891 txok = ieee80211_tx_pending_skb(local, skb);
3892 spin_lock_irqsave(&local->queue_stop_reason_lock,
3898 if (skb_queue_empty(&local->pending[i]))
3899 ieee80211_propagate_queue_wake(local, i);
3901 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3906 /* functions for drivers to get certain frames */
3908 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3909 struct ps_data *ps, struct sk_buff *skb,
3914 int i, have_bits = 0, n1, n2;
3916 /* Generate bitmap for TIM only if there are any STAs in power save
3918 if (atomic_read(&ps->num_sta_ps) > 0)
3919 /* in the hope that this is faster than
3920 * checking byte-for-byte */
3921 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3922 IEEE80211_MAX_AID+1);
3924 if (ps->dtim_count == 0)
3925 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3930 tim = pos = skb_put(skb, 6);
3931 *pos++ = WLAN_EID_TIM;
3933 *pos++ = ps->dtim_count;
3934 *pos++ = sdata->vif.bss_conf.dtim_period;
3936 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3939 ps->dtim_bc_mc = aid0 == 1;
3942 /* Find largest even number N1 so that bits numbered 1 through
3943 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3944 * (N2 + 1) x 8 through 2007 are 0. */
3946 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3953 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3960 /* Bitmap control */
3962 /* Part Virt Bitmap */
3963 skb_put(skb, n2 - n1);
3964 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3966 tim[1] = n2 - n1 + 4;
3968 *pos++ = aid0; /* Bitmap control */
3969 *pos++ = 0; /* Part Virt Bitmap */
3973 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3974 struct ps_data *ps, struct sk_buff *skb,
3977 struct ieee80211_local *local = sdata->local;
3980 * Not very nice, but we want to allow the driver to call
3981 * ieee80211_beacon_get() as a response to the set_tim()
3982 * callback. That, however, is already invoked under the
3983 * sta_lock to guarantee consistent and race-free update
3984 * of the tim bitmap in mac80211 and the driver.
3986 if (local->tim_in_locked_section) {
3987 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3989 spin_lock_bh(&local->tim_lock);
3990 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3991 spin_unlock_bh(&local->tim_lock);
3997 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3998 struct beacon_data *beacon)
4000 struct probe_resp *resp;
4002 size_t beacon_data_len;
4004 u8 count = beacon->csa_current_counter;
4006 switch (sdata->vif.type) {
4007 case NL80211_IFTYPE_AP:
4008 beacon_data = beacon->tail;
4009 beacon_data_len = beacon->tail_len;
4011 case NL80211_IFTYPE_ADHOC:
4012 beacon_data = beacon->head;
4013 beacon_data_len = beacon->head_len;
4015 case NL80211_IFTYPE_MESH_POINT:
4016 beacon_data = beacon->head;
4017 beacon_data_len = beacon->head_len;
4024 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
4025 resp = rcu_dereference(sdata->u.ap.probe_resp);
4027 if (beacon->csa_counter_offsets[i]) {
4028 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
4034 beacon_data[beacon->csa_counter_offsets[i]] = count;
4037 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
4038 resp->data[resp->csa_counter_offsets[i]] = count;
4043 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
4045 beacon->csa_current_counter--;
4047 /* the counter should never reach 0 */
4048 WARN_ON_ONCE(!beacon->csa_current_counter);
4050 return beacon->csa_current_counter;
4053 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4055 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4056 struct beacon_data *beacon = NULL;
4061 if (sdata->vif.type == NL80211_IFTYPE_AP)
4062 beacon = rcu_dereference(sdata->u.ap.beacon);
4063 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4064 beacon = rcu_dereference(sdata->u.ibss.presp);
4065 else if (ieee80211_vif_is_mesh(&sdata->vif))
4066 beacon = rcu_dereference(sdata->u.mesh.beacon);
4071 count = __ieee80211_csa_update_counter(beacon);
4077 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4079 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4081 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4082 struct beacon_data *beacon = NULL;
4084 size_t beacon_data_len;
4087 if (!ieee80211_sdata_running(sdata))
4091 if (vif->type == NL80211_IFTYPE_AP) {
4092 struct ieee80211_if_ap *ap = &sdata->u.ap;
4094 beacon = rcu_dereference(ap->beacon);
4095 if (WARN_ON(!beacon || !beacon->tail))
4097 beacon_data = beacon->tail;
4098 beacon_data_len = beacon->tail_len;
4099 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4100 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4102 beacon = rcu_dereference(ifibss->presp);
4106 beacon_data = beacon->head;
4107 beacon_data_len = beacon->head_len;
4108 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4109 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4111 beacon = rcu_dereference(ifmsh->beacon);
4115 beacon_data = beacon->head;
4116 beacon_data_len = beacon->head_len;
4122 if (!beacon->csa_counter_offsets[0])
4125 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4128 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4135 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4137 static struct sk_buff *
4138 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4139 struct ieee80211_vif *vif,
4140 struct ieee80211_mutable_offsets *offs,
4143 struct ieee80211_local *local = hw_to_local(hw);
4144 struct beacon_data *beacon = NULL;
4145 struct sk_buff *skb = NULL;
4146 struct ieee80211_tx_info *info;
4147 struct ieee80211_sub_if_data *sdata = NULL;
4148 enum nl80211_band band;
4149 struct ieee80211_tx_rate_control txrc;
4150 struct ieee80211_chanctx_conf *chanctx_conf;
4151 int csa_off_base = 0;
4155 sdata = vif_to_sdata(vif);
4156 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4158 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4162 memset(offs, 0, sizeof(*offs));
4164 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4165 struct ieee80211_if_ap *ap = &sdata->u.ap;
4167 beacon = rcu_dereference(ap->beacon);
4169 if (beacon->csa_counter_offsets[0]) {
4171 __ieee80211_csa_update_counter(beacon);
4173 ieee80211_set_csa(sdata, beacon);
4177 * headroom, head length,
4178 * tail length and maximum TIM length
4180 skb = dev_alloc_skb(local->tx_headroom +
4182 beacon->tail_len + 256 +
4183 local->hw.extra_beacon_tailroom);
4187 skb_reserve(skb, local->tx_headroom);
4188 skb_put_data(skb, beacon->head, beacon->head_len);
4190 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4194 offs->tim_offset = beacon->head_len;
4195 offs->tim_length = skb->len - beacon->head_len;
4197 /* for AP the csa offsets are from tail */
4198 csa_off_base = skb->len;
4202 skb_put_data(skb, beacon->tail,
4206 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4207 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4208 struct ieee80211_hdr *hdr;
4210 beacon = rcu_dereference(ifibss->presp);
4214 if (beacon->csa_counter_offsets[0]) {
4216 __ieee80211_csa_update_counter(beacon);
4218 ieee80211_set_csa(sdata, beacon);
4221 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4222 local->hw.extra_beacon_tailroom);
4225 skb_reserve(skb, local->tx_headroom);
4226 skb_put_data(skb, beacon->head, beacon->head_len);
4228 hdr = (struct ieee80211_hdr *) skb->data;
4229 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4230 IEEE80211_STYPE_BEACON);
4231 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4232 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4234 beacon = rcu_dereference(ifmsh->beacon);
4238 if (beacon->csa_counter_offsets[0]) {
4240 /* TODO: For mesh csa_counter is in TU, so
4241 * decrementing it by one isn't correct, but
4242 * for now we leave it consistent with overall
4243 * mac80211's behavior.
4245 __ieee80211_csa_update_counter(beacon);
4247 ieee80211_set_csa(sdata, beacon);
4250 if (ifmsh->sync_ops)
4251 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4253 skb = dev_alloc_skb(local->tx_headroom +
4257 local->hw.extra_beacon_tailroom);
4260 skb_reserve(skb, local->tx_headroom);
4261 skb_put_data(skb, beacon->head, beacon->head_len);
4262 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4265 offs->tim_offset = beacon->head_len;
4266 offs->tim_length = skb->len - beacon->head_len;
4269 skb_put_data(skb, beacon->tail, beacon->tail_len);
4276 if (offs && beacon) {
4279 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4280 u16 csa_off = beacon->csa_counter_offsets[i];
4285 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4289 band = chanctx_conf->def.chan->band;
4291 info = IEEE80211_SKB_CB(skb);
4293 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4294 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4297 memset(&txrc, 0, sizeof(txrc));
4299 txrc.sband = local->hw.wiphy->bands[band];
4300 txrc.bss_conf = &sdata->vif.bss_conf;
4302 txrc.reported_rate.idx = -1;
4303 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4305 rate_control_get_rate(sdata, NULL, &txrc);
4307 info->control.vif = vif;
4309 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4310 IEEE80211_TX_CTL_ASSIGN_SEQ |
4311 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4319 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4320 struct ieee80211_vif *vif,
4321 struct ieee80211_mutable_offsets *offs)
4323 return __ieee80211_beacon_get(hw, vif, offs, true);
4325 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4327 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4328 struct ieee80211_vif *vif,
4329 u16 *tim_offset, u16 *tim_length)
4331 struct ieee80211_mutable_offsets offs = {};
4332 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4333 struct sk_buff *copy;
4334 struct ieee80211_supported_band *sband;
4341 *tim_offset = offs.tim_offset;
4344 *tim_length = offs.tim_length;
4346 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4347 !hw_to_local(hw)->monitors)
4350 /* send a copy to monitor interfaces */
4351 copy = skb_copy(bcn, GFP_ATOMIC);
4355 shift = ieee80211_vif_get_shift(vif);
4356 sband = ieee80211_get_sband(vif_to_sdata(vif));
4360 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4364 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4366 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4367 struct ieee80211_vif *vif)
4369 struct ieee80211_if_ap *ap = NULL;
4370 struct sk_buff *skb = NULL;
4371 struct probe_resp *presp = NULL;
4372 struct ieee80211_hdr *hdr;
4373 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4375 if (sdata->vif.type != NL80211_IFTYPE_AP)
4381 presp = rcu_dereference(ap->probe_resp);
4385 skb = dev_alloc_skb(presp->len);
4389 skb_put_data(skb, presp->data, presp->len);
4391 hdr = (struct ieee80211_hdr *) skb->data;
4392 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4398 EXPORT_SYMBOL(ieee80211_proberesp_get);
4400 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4401 struct ieee80211_vif *vif)
4403 struct ieee80211_sub_if_data *sdata;
4404 struct ieee80211_if_managed *ifmgd;
4405 struct ieee80211_pspoll *pspoll;
4406 struct ieee80211_local *local;
4407 struct sk_buff *skb;
4409 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4412 sdata = vif_to_sdata(vif);
4413 ifmgd = &sdata->u.mgd;
4414 local = sdata->local;
4416 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4420 skb_reserve(skb, local->hw.extra_tx_headroom);
4422 pspoll = skb_put_zero(skb, sizeof(*pspoll));
4423 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4424 IEEE80211_STYPE_PSPOLL);
4425 pspoll->aid = cpu_to_le16(ifmgd->aid);
4427 /* aid in PS-Poll has its two MSBs each set to 1 */
4428 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4430 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4431 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4435 EXPORT_SYMBOL(ieee80211_pspoll_get);
4437 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4438 struct ieee80211_vif *vif,
4441 struct ieee80211_hdr_3addr *nullfunc;
4442 struct ieee80211_sub_if_data *sdata;
4443 struct ieee80211_if_managed *ifmgd;
4444 struct ieee80211_local *local;
4445 struct sk_buff *skb;
4448 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4451 sdata = vif_to_sdata(vif);
4452 ifmgd = &sdata->u.mgd;
4453 local = sdata->local;
4456 struct sta_info *sta;
4459 sta = sta_info_get(sdata, ifmgd->bssid);
4460 qos = sta && sta->sta.wme;
4464 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4465 sizeof(*nullfunc) + 2);
4469 skb_reserve(skb, local->hw.extra_tx_headroom);
4471 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4472 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4473 IEEE80211_STYPE_NULLFUNC |
4474 IEEE80211_FCTL_TODS);
4476 __le16 qos = cpu_to_le16(7);
4478 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
4479 IEEE80211_STYPE_NULLFUNC) !=
4480 IEEE80211_STYPE_QOS_NULLFUNC);
4481 nullfunc->frame_control |=
4482 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
4484 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
4485 skb_put_data(skb, &qos, sizeof(qos));
4488 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4489 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4490 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4494 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4496 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4498 const u8 *ssid, size_t ssid_len,
4501 struct ieee80211_local *local = hw_to_local(hw);
4502 struct ieee80211_hdr_3addr *hdr;
4503 struct sk_buff *skb;
4507 ie_ssid_len = 2 + ssid_len;
4509 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4510 ie_ssid_len + tailroom);
4514 skb_reserve(skb, local->hw.extra_tx_headroom);
4516 hdr = skb_put_zero(skb, sizeof(*hdr));
4517 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4518 IEEE80211_STYPE_PROBE_REQ);
4519 eth_broadcast_addr(hdr->addr1);
4520 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4521 eth_broadcast_addr(hdr->addr3);
4523 pos = skb_put(skb, ie_ssid_len);
4524 *pos++ = WLAN_EID_SSID;
4527 memcpy(pos, ssid, ssid_len);
4532 EXPORT_SYMBOL(ieee80211_probereq_get);
4534 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4535 const void *frame, size_t frame_len,
4536 const struct ieee80211_tx_info *frame_txctl,
4537 struct ieee80211_rts *rts)
4539 const struct ieee80211_hdr *hdr = frame;
4541 rts->frame_control =
4542 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4543 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4545 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4546 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4548 EXPORT_SYMBOL(ieee80211_rts_get);
4550 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4551 const void *frame, size_t frame_len,
4552 const struct ieee80211_tx_info *frame_txctl,
4553 struct ieee80211_cts *cts)
4555 const struct ieee80211_hdr *hdr = frame;
4557 cts->frame_control =
4558 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4559 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4560 frame_len, frame_txctl);
4561 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4563 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4566 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4567 struct ieee80211_vif *vif)
4569 struct ieee80211_local *local = hw_to_local(hw);
4570 struct sk_buff *skb = NULL;
4571 struct ieee80211_tx_data tx;
4572 struct ieee80211_sub_if_data *sdata;
4574 struct ieee80211_tx_info *info;
4575 struct ieee80211_chanctx_conf *chanctx_conf;
4577 sdata = vif_to_sdata(vif);
4580 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4585 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4586 struct beacon_data *beacon =
4587 rcu_dereference(sdata->u.ap.beacon);
4589 if (!beacon || !beacon->head)
4592 ps = &sdata->u.ap.ps;
4593 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4594 ps = &sdata->u.mesh.ps;
4599 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4600 goto out; /* send buffered bc/mc only after DTIM beacon */
4603 skb = skb_dequeue(&ps->bc_buf);
4606 local->total_ps_buffered--;
4608 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4609 struct ieee80211_hdr *hdr =
4610 (struct ieee80211_hdr *) skb->data;
4611 /* more buffered multicast/broadcast frames ==> set
4612 * MoreData flag in IEEE 802.11 header to inform PS
4614 hdr->frame_control |=
4615 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4618 if (sdata->vif.type == NL80211_IFTYPE_AP)
4619 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4620 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4622 ieee80211_free_txskb(hw, skb);
4625 info = IEEE80211_SKB_CB(skb);
4627 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4628 info->band = chanctx_conf->def.chan->band;
4630 if (invoke_tx_handlers(&tx))
4637 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4639 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4641 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4642 struct ieee80211_sub_if_data *sdata = sta->sdata;
4643 struct ieee80211_local *local = sdata->local;
4647 lockdep_assert_held(&local->sta_mtx);
4649 /* only some cases are supported right now */
4650 switch (sdata->vif.type) {
4651 case NL80211_IFTYPE_STATION:
4652 case NL80211_IFTYPE_AP:
4653 case NL80211_IFTYPE_AP_VLAN:
4660 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4663 if (sta->reserved_tid == tid) {
4668 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4669 sdata_err(sdata, "TID reservation already active\n");
4674 ieee80211_stop_vif_queues(sdata->local, sdata,
4675 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4679 /* Tear down BA sessions so we stop aggregating on this TID */
4680 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4681 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4682 __ieee80211_stop_tx_ba_session(sta, tid,
4683 AGG_STOP_LOCAL_REQUEST);
4686 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4687 __ieee80211_flush_queues(local, sdata, queues, false);
4689 sta->reserved_tid = tid;
4691 ieee80211_wake_vif_queues(local, sdata,
4692 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4694 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4695 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4701 EXPORT_SYMBOL(ieee80211_reserve_tid);
4703 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4705 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4706 struct ieee80211_sub_if_data *sdata = sta->sdata;
4708 lockdep_assert_held(&sdata->local->sta_mtx);
4710 /* only some cases are supported right now */
4711 switch (sdata->vif.type) {
4712 case NL80211_IFTYPE_STATION:
4713 case NL80211_IFTYPE_AP:
4714 case NL80211_IFTYPE_AP_VLAN:
4721 if (tid != sta->reserved_tid) {
4722 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4726 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4728 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4730 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4731 struct sk_buff *skb, int tid,
4732 enum nl80211_band band)
4734 int ac = ieee80211_ac_from_tid(tid);
4736 skb_reset_mac_header(skb);
4737 skb_set_queue_mapping(skb, ac);
4738 skb->priority = tid;
4740 skb->dev = sdata->dev;
4743 * The other path calling ieee80211_xmit is from the tasklet,
4744 * and while we can handle concurrent transmissions locking
4745 * requirements are that we do not come into tx with bhs on.
4748 IEEE80211_SKB_CB(skb)->band = band;
4749 ieee80211_xmit(sdata, NULL, skb);