2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 * Transmit and frame generation functions.
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/bitmap.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <net/net_namespace.h>
24 #include <net/ieee80211_radiotap.h>
25 #include <net/cfg80211.h>
26 #include <net/mac80211.h>
27 #include <net/codel.h>
28 #include <net/codel_impl.h>
29 #include <asm/unaligned.h>
30 #include <net/fq_impl.h>
32 #include "ieee80211_i.h"
33 #include "driver-ops.h"
43 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
45 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
47 u64_stats_update_begin(&tstats->syncp);
49 tstats->tx_bytes += len;
50 u64_stats_update_end(&tstats->syncp);
53 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
54 struct sk_buff *skb, int group_addr,
57 int rate, mrate, erp, dur, i, shift = 0;
58 struct ieee80211_rate *txrate;
59 struct ieee80211_local *local = tx->local;
60 struct ieee80211_supported_band *sband;
61 struct ieee80211_hdr *hdr;
62 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
63 struct ieee80211_chanctx_conf *chanctx_conf;
67 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
69 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
70 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
74 /* assume HW handles this */
75 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
79 if (WARN_ON_ONCE(tx->rate.idx < 0))
82 sband = local->hw.wiphy->bands[info->band];
83 txrate = &sband->bitrates[tx->rate.idx];
85 erp = txrate->flags & IEEE80211_RATE_ERP_G;
88 * data and mgmt (except PS Poll):
90 * - during contention period:
91 * if addr1 is group address: 0
92 * if more fragments = 0 and addr1 is individual address: time to
93 * transmit one ACK plus SIFS
94 * if more fragments = 1 and addr1 is individual address: time to
95 * transmit next fragment plus 2 x ACK plus 3 x SIFS
98 * - control response frame (CTS or ACK) shall be transmitted using the
99 * same rate as the immediately previous frame in the frame exchange
100 * sequence, if this rate belongs to the PHY mandatory rates, or else
101 * at the highest possible rate belonging to the PHY rates in the
104 hdr = (struct ieee80211_hdr *)skb->data;
105 if (ieee80211_is_ctl(hdr->frame_control)) {
106 /* TODO: These control frames are not currently sent by
107 * mac80211, but should they be implemented, this function
108 * needs to be updated to support duration field calculation.
110 * RTS: time needed to transmit pending data/mgmt frame plus
111 * one CTS frame plus one ACK frame plus 3 x SIFS
112 * CTS: duration of immediately previous RTS minus time
113 * required to transmit CTS and its SIFS
114 * ACK: 0 if immediately previous directed data/mgmt had
115 * more=0, with more=1 duration in ACK frame is duration
116 * from previous frame minus time needed to transmit ACK
118 * PS Poll: BIT(15) | BIT(14) | aid
124 if (0 /* FIX: data/mgmt during CFP */)
125 return cpu_to_le16(32768);
127 if (group_addr) /* Group address as the destination - no ACK */
130 /* Individual destination address:
131 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
132 * CTS and ACK frames shall be transmitted using the highest rate in
133 * basic rate set that is less than or equal to the rate of the
134 * immediately previous frame and that is using the same modulation
135 * (CCK or OFDM). If no basic rate set matches with these requirements,
136 * the highest mandatory rate of the PHY that is less than or equal to
137 * the rate of the previous frame is used.
138 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
141 /* use lowest available if everything fails */
142 mrate = sband->bitrates[0].bitrate;
143 for (i = 0; i < sband->n_bitrates; i++) {
144 struct ieee80211_rate *r = &sband->bitrates[i];
146 if (r->bitrate > txrate->bitrate)
149 if ((rate_flags & r->flags) != rate_flags)
152 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
153 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
155 switch (sband->band) {
156 case NL80211_BAND_2GHZ: {
158 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
159 flag = IEEE80211_RATE_MANDATORY_G;
161 flag = IEEE80211_RATE_MANDATORY_B;
166 case NL80211_BAND_5GHZ:
167 if (r->flags & IEEE80211_RATE_MANDATORY_A)
170 case NL80211_BAND_60GHZ:
171 /* TODO, for now fall through */
172 case NUM_NL80211_BANDS:
178 /* No matching basic rate found; use highest suitable mandatory
180 rate = DIV_ROUND_UP(mrate, 1 << shift);
183 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
184 if (ieee80211_is_data_qos(hdr->frame_control) &&
185 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
188 /* Time needed to transmit ACK
189 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
190 * to closest integer */
191 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
192 tx->sdata->vif.bss_conf.use_short_preamble,
196 /* Frame is fragmented: duration increases with time needed to
197 * transmit next fragment plus ACK and 2 x SIFS. */
198 dur *= 2; /* ACK + SIFS */
200 dur += ieee80211_frame_duration(sband->band, next_frag_len,
201 txrate->bitrate, erp,
202 tx->sdata->vif.bss_conf.use_short_preamble,
206 return cpu_to_le16(dur);
210 static ieee80211_tx_result debug_noinline
211 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
213 struct ieee80211_local *local = tx->local;
214 struct ieee80211_if_managed *ifmgd;
216 /* driver doesn't support power save */
217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
220 /* hardware does dynamic power save */
221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
224 /* dynamic power save disabled */
225 if (local->hw.conf.dynamic_ps_timeout <= 0)
228 /* we are scanning, don't enable power save */
232 if (!local->ps_sdata)
235 /* No point if we're going to suspend */
236 if (local->quiescing)
239 /* dynamic ps is supported only in managed mode */
240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
243 ifmgd = &tx->sdata->u.mgd;
246 * Don't wakeup from power save if u-apsd is enabled, voip ac has
247 * u-apsd enabled and the frame is in voip class. This effectively
248 * means that even if all access categories have u-apsd enabled, in
249 * practise u-apsd is only used with the voip ac. This is a
250 * workaround for the case when received voip class packets do not
251 * have correct qos tag for some reason, due the network or the
254 * Note: ifmgd->uapsd_queues access is racy here. If the value is
255 * changed via debugfs, user needs to reassociate manually to have
256 * everything in sync.
258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
263 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
264 ieee80211_stop_queues_by_reason(&local->hw,
265 IEEE80211_MAX_QUEUE_MAP,
266 IEEE80211_QUEUE_STOP_REASON_PS,
268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
269 ieee80211_queue_work(&local->hw,
270 &local->dynamic_ps_disable_work);
273 /* Don't restart the timer if we're not disassociated */
274 if (!ifmgd->associated)
277 mod_timer(&local->dynamic_ps_timer, jiffies +
278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
283 static ieee80211_tx_result debug_noinline
284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
296 !ieee80211_is_probe_req(hdr->frame_control) &&
297 !ieee80211_is_any_nullfunc(hdr->frame_control))
299 * When software scanning only nullfunc frames (to notify
300 * the sleep state to the AP) and probe requests (for the
301 * active scan) are allowed, all other frames should not be
302 * sent and we should not get here, but if we do
303 * nonetheless, drop them to avoid sending them
304 * off-channel. See the link below and
305 * ieee80211_start_scan() for more.
307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
314 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
317 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
321 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
323 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
324 if (unlikely(!assoc &&
325 ieee80211_is_data(hdr->frame_control))) {
326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
327 sdata_info(tx->sdata,
328 "dropped data frame to not associated station %pM\n",
331 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
334 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
335 ieee80211_is_data(hdr->frame_control) &&
336 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
338 * No associated STAs - no need to send multicast
347 /* This function is called whenever the AP is about to exceed the maximum limit
348 * of buffered frames for power saving STAs. This situation should not really
349 * happen often during normal operation, so dropping the oldest buffered packet
350 * from each queue should be OK to make some room for new frames. */
351 static void purge_old_ps_buffers(struct ieee80211_local *local)
353 int total = 0, purged = 0;
355 struct ieee80211_sub_if_data *sdata;
356 struct sta_info *sta;
358 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
361 if (sdata->vif.type == NL80211_IFTYPE_AP)
362 ps = &sdata->u.ap.ps;
363 else if (ieee80211_vif_is_mesh(&sdata->vif))
364 ps = &sdata->u.mesh.ps;
368 skb = skb_dequeue(&ps->bc_buf);
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 and no buffered packets */
438 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
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)) {
597 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
599 else if (ieee80211_is_group_privacy_action(tx->skb) &&
600 (key = rcu_dereference(tx->sdata->default_multicast_key)))
602 else if (ieee80211_is_mgmt(hdr->frame_control) &&
603 is_multicast_ether_addr(hdr->addr1) &&
604 ieee80211_is_robust_mgmt_frame(tx->skb) &&
605 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
607 else if (is_multicast_ether_addr(hdr->addr1) &&
608 (key = rcu_dereference(tx->sdata->default_multicast_key)))
610 else if (!is_multicast_ether_addr(hdr->addr1) &&
611 (key = rcu_dereference(tx->sdata->default_unicast_key)))
617 bool skip_hw = false;
619 /* TODO: add threshold stuff again */
621 switch (tx->key->conf.cipher) {
622 case WLAN_CIPHER_SUITE_WEP40:
623 case WLAN_CIPHER_SUITE_WEP104:
624 case WLAN_CIPHER_SUITE_TKIP:
625 if (!ieee80211_is_data_present(hdr->frame_control))
628 case WLAN_CIPHER_SUITE_CCMP:
629 case WLAN_CIPHER_SUITE_CCMP_256:
630 case WLAN_CIPHER_SUITE_GCMP:
631 case WLAN_CIPHER_SUITE_GCMP_256:
632 if (!ieee80211_is_data_present(hdr->frame_control) &&
633 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
635 !ieee80211_is_group_privacy_action(tx->skb))
638 skip_hw = (tx->key->conf.flags &
639 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
640 ieee80211_is_mgmt(hdr->frame_control);
642 case WLAN_CIPHER_SUITE_AES_CMAC:
643 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
644 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
645 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
646 if (!ieee80211_is_mgmt(hdr->frame_control))
651 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
652 !ieee80211_is_deauth(hdr->frame_control)))
655 if (!skip_hw && tx->key &&
656 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
657 info->control.hw_key = &tx->key->conf;
658 } else if (!ieee80211_is_mgmt(hdr->frame_control) && tx->sta &&
659 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) {
666 static ieee80211_tx_result debug_noinline
667 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
669 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
670 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
671 struct ieee80211_supported_band *sband;
673 struct ieee80211_tx_rate_control txrc;
674 struct ieee80211_sta_rates *ratetbl = NULL;
677 memset(&txrc, 0, sizeof(txrc));
679 sband = tx->local->hw.wiphy->bands[info->band];
681 len = min_t(u32, tx->skb->len + FCS_LEN,
682 tx->local->hw.wiphy->frag_threshold);
684 /* set up the tx rate control struct we give the RC algo */
685 txrc.hw = &tx->local->hw;
687 txrc.bss_conf = &tx->sdata->vif.bss_conf;
689 txrc.reported_rate.idx = -1;
690 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
691 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
692 txrc.max_rate_idx = -1;
694 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
696 if (tx->sdata->rc_has_mcs_mask[info->band])
697 txrc.rate_idx_mcs_mask =
698 tx->sdata->rc_rateidx_mcs_mask[info->band];
700 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
701 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
702 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
703 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
705 /* set up RTS protection if desired */
706 if (len > tx->local->hw.wiphy->rts_threshold) {
710 info->control.use_rts = txrc.rts;
711 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
714 * Use short preamble if the BSS can handle it, but not for
715 * management frames unless we know the receiver can handle
716 * that -- the management frame might be to a station that
717 * just wants a probe response.
719 if (tx->sdata->vif.bss_conf.use_short_preamble &&
720 (ieee80211_is_data(hdr->frame_control) ||
721 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
722 txrc.short_preamble = true;
724 info->control.short_preamble = txrc.short_preamble;
726 /* don't ask rate control when rate already injected via radiotap */
727 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
731 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
734 * Lets not bother rate control if we're associated and cannot
735 * talk to the sta. This should not happen.
737 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
738 !rate_usable_index_exists(sband, &tx->sta->sta),
739 "%s: Dropped data frame as no usable bitrate found while "
740 "scanning and associated. Target station: "
741 "%pM on %d GHz band\n",
742 tx->sdata->name, hdr->addr1,
747 * If we're associated with the sta at this point we know we can at
748 * least send the frame at the lowest bit rate.
750 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
752 if (tx->sta && !info->control.skip_table)
753 ratetbl = rcu_dereference(tx->sta->sta.rates);
755 if (unlikely(info->control.rates[0].idx < 0)) {
757 struct ieee80211_tx_rate rate = {
758 .idx = ratetbl->rate[0].idx,
759 .flags = ratetbl->rate[0].flags,
760 .count = ratetbl->rate[0].count
763 if (ratetbl->rate[0].idx < 0)
771 tx->rate = info->control.rates[0];
774 if (txrc.reported_rate.idx < 0) {
775 txrc.reported_rate = tx->rate;
776 if (tx->sta && ieee80211_is_data(hdr->frame_control))
777 tx->sta->tx_stats.last_rate = txrc.reported_rate;
779 tx->sta->tx_stats.last_rate = txrc.reported_rate;
784 if (unlikely(!info->control.rates[0].count))
785 info->control.rates[0].count = 1;
787 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
788 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
789 info->control.rates[0].count = 1;
794 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
796 u16 *seq = &sta->tid_seq[tid];
797 __le16 ret = cpu_to_le16(*seq);
799 /* Increase the sequence number. */
800 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
805 static ieee80211_tx_result debug_noinline
806 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
808 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
809 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
814 * Packet injection may want to control the sequence
815 * number, if we have no matching interface then we
816 * neither assign one ourselves nor ask the driver to.
818 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
821 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
824 if (ieee80211_hdrlen(hdr->frame_control) < 24)
827 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
831 * Anything but QoS data that has a sequence number field
832 * (is long enough) gets a sequence number from the global
833 * counter. QoS data frames with a multicast destination
834 * also use the global counter (802.11-2012 9.3.2.10).
836 if (!ieee80211_is_data_qos(hdr->frame_control) ||
837 is_multicast_ether_addr(hdr->addr1)) {
838 /* driver should assign sequence number */
839 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
840 /* for pure STA mode without beacons, we can do it */
841 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
842 tx->sdata->sequence_number += 0x10;
844 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
849 * This should be true for injected/management frames only, for
850 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
851 * above since they are not QoS-data frames.
856 /* include per-STA, per-TID sequence counter */
858 qc = ieee80211_get_qos_ctl(hdr);
859 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
860 tx->sta->tx_stats.msdu[tid]++;
862 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
867 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
868 struct sk_buff *skb, int hdrlen,
871 struct ieee80211_local *local = tx->local;
872 struct ieee80211_tx_info *info;
874 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
875 int pos = hdrlen + per_fragm;
876 int rem = skb->len - hdrlen - per_fragm;
878 if (WARN_ON(rem < 0))
881 /* first fragment was already added to queue by caller */
884 int fraglen = per_fragm;
889 tmp = dev_alloc_skb(local->tx_headroom +
891 tx->sdata->encrypt_headroom +
892 IEEE80211_ENCRYPT_TAILROOM);
896 __skb_queue_tail(&tx->skbs, tmp);
899 local->tx_headroom + tx->sdata->encrypt_headroom);
901 /* copy control information */
902 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
904 info = IEEE80211_SKB_CB(tmp);
905 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
906 IEEE80211_TX_CTL_FIRST_FRAGMENT);
909 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
911 skb_copy_queue_mapping(tmp, skb);
912 tmp->priority = skb->priority;
915 /* copy header and data */
916 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
917 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
922 /* adjust first fragment's length */
923 skb_trim(skb, hdrlen + per_fragm);
927 static ieee80211_tx_result debug_noinline
928 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
930 struct sk_buff *skb = tx->skb;
931 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
932 struct ieee80211_hdr *hdr = (void *)skb->data;
933 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
937 /* no matter what happens, tx->skb moves to tx->skbs */
938 __skb_queue_tail(&tx->skbs, skb);
941 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
944 if (tx->local->ops->set_frag_threshold)
948 * Warn when submitting a fragmented A-MPDU frame and drop it.
949 * This scenario is handled in ieee80211_tx_prepare but extra
950 * caution taken here as fragmented ampdu may cause Tx stop.
952 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
955 hdrlen = ieee80211_hdrlen(hdr->frame_control);
957 /* internal error, why isn't DONTFRAG set? */
958 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
962 * Now fragment the frame. This will allocate all the fragments and
963 * chain them (using skb as the first fragment) to skb->next.
964 * During transmission, we will remove the successfully transmitted
965 * fragments from this list. When the low-level driver rejects one
966 * of the fragments then we will simply pretend to accept the skb
967 * but store it away as pending.
969 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
972 /* update duration/seq/flags of fragments */
975 skb_queue_walk(&tx->skbs, skb) {
976 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
978 hdr = (void *)skb->data;
979 info = IEEE80211_SKB_CB(skb);
981 if (!skb_queue_is_last(&tx->skbs, skb)) {
982 hdr->frame_control |= morefrags;
984 * No multi-rate retries for fragmented frames, that
985 * would completely throw off the NAV at other STAs.
987 info->control.rates[1].idx = -1;
988 info->control.rates[2].idx = -1;
989 info->control.rates[3].idx = -1;
990 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
991 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
993 hdr->frame_control &= ~morefrags;
995 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
1002 static ieee80211_tx_result debug_noinline
1003 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1005 struct sk_buff *skb;
1011 skb_queue_walk(&tx->skbs, skb) {
1012 ac = skb_get_queue_mapping(skb);
1013 tx->sta->tx_stats.bytes[ac] += skb->len;
1016 tx->sta->tx_stats.packets[ac]++;
1021 static ieee80211_tx_result debug_noinline
1022 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1027 switch (tx->key->conf.cipher) {
1028 case WLAN_CIPHER_SUITE_WEP40:
1029 case WLAN_CIPHER_SUITE_WEP104:
1030 return ieee80211_crypto_wep_encrypt(tx);
1031 case WLAN_CIPHER_SUITE_TKIP:
1032 return ieee80211_crypto_tkip_encrypt(tx);
1033 case WLAN_CIPHER_SUITE_CCMP:
1034 return ieee80211_crypto_ccmp_encrypt(
1035 tx, IEEE80211_CCMP_MIC_LEN);
1036 case WLAN_CIPHER_SUITE_CCMP_256:
1037 return ieee80211_crypto_ccmp_encrypt(
1038 tx, IEEE80211_CCMP_256_MIC_LEN);
1039 case WLAN_CIPHER_SUITE_AES_CMAC:
1040 return ieee80211_crypto_aes_cmac_encrypt(tx);
1041 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1042 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1043 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1044 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1045 return ieee80211_crypto_aes_gmac_encrypt(tx);
1046 case WLAN_CIPHER_SUITE_GCMP:
1047 case WLAN_CIPHER_SUITE_GCMP_256:
1048 return ieee80211_crypto_gcmp_encrypt(tx);
1050 return ieee80211_crypto_hw_encrypt(tx);
1056 static ieee80211_tx_result debug_noinline
1057 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1059 struct sk_buff *skb;
1060 struct ieee80211_hdr *hdr;
1064 skb_queue_walk(&tx->skbs, skb) {
1065 hdr = (void *) skb->data;
1066 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1067 break; /* must not overwrite AID */
1068 if (!skb_queue_is_last(&tx->skbs, skb)) {
1069 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1070 next_len = next->len;
1073 group_addr = is_multicast_ether_addr(hdr->addr1);
1076 ieee80211_duration(tx, skb, group_addr, next_len);
1082 /* actual transmit path */
1084 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1085 struct sk_buff *skb,
1086 struct ieee80211_tx_info *info,
1087 struct tid_ampdu_tx *tid_tx,
1090 bool queued = false;
1091 bool reset_agg_timer = false;
1092 struct sk_buff *purge_skb = NULL;
1094 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1095 info->flags |= IEEE80211_TX_CTL_AMPDU;
1096 reset_agg_timer = true;
1097 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1099 * nothing -- this aggregation session is being started
1100 * but that might still fail with the driver
1102 } else if (!tx->sta->sta.txq[tid]) {
1103 spin_lock(&tx->sta->lock);
1105 * Need to re-check now, because we may get here
1107 * 1) in the window during which the setup is actually
1108 * already done, but not marked yet because not all
1109 * packets are spliced over to the driver pending
1110 * queue yet -- if this happened we acquire the lock
1111 * either before or after the splice happens, but
1112 * need to recheck which of these cases happened.
1114 * 2) during session teardown, if the OPERATIONAL bit
1115 * was cleared due to the teardown but the pointer
1116 * hasn't been assigned NULL yet (or we loaded it
1117 * before it was assigned) -- in this case it may
1118 * now be NULL which means we should just let the
1119 * packet pass through because splicing the frames
1120 * back is already done.
1122 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1125 /* do nothing, let packet pass through */
1126 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1127 info->flags |= IEEE80211_TX_CTL_AMPDU;
1128 reset_agg_timer = true;
1131 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1132 clear_sta_flag(tx->sta, WLAN_STA_SP);
1133 ps_dbg(tx->sta->sdata,
1134 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1135 tx->sta->sta.addr, tx->sta->sta.aid);
1137 info->control.vif = &tx->sdata->vif;
1138 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1139 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1140 __skb_queue_tail(&tid_tx->pending, skb);
1141 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1142 purge_skb = __skb_dequeue(&tid_tx->pending);
1144 spin_unlock(&tx->sta->lock);
1147 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1150 /* reset session timer */
1151 if (reset_agg_timer && tid_tx->timeout)
1152 tid_tx->last_tx = jiffies;
1159 * pass %NULL for the station if unknown, a valid pointer if known
1160 * or an ERR_PTR() if the station is known not to exist
1162 static ieee80211_tx_result
1163 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1164 struct ieee80211_tx_data *tx,
1165 struct sta_info *sta, struct sk_buff *skb)
1167 struct ieee80211_local *local = sdata->local;
1168 struct ieee80211_hdr *hdr;
1169 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1173 memset(tx, 0, sizeof(*tx));
1177 __skb_queue_head_init(&tx->skbs);
1180 * If this flag is set to true anywhere, and we get here,
1181 * we are doing the needed processing, so remove the flag
1184 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1186 hdr = (struct ieee80211_hdr *) skb->data;
1192 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1193 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1194 if (!tx->sta && sdata->wdev.use_4addr)
1196 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1197 IEEE80211_TX_CTL_INJECTED) ||
1198 tx->sdata->control_port_protocol == tx->skb->protocol) {
1199 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1201 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1202 tx->sta = sta_info_get(sdata, hdr->addr1);
1205 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1206 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1207 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1208 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1209 struct tid_ampdu_tx *tid_tx;
1211 qc = ieee80211_get_qos_ctl(hdr);
1212 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1214 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1218 queued = ieee80211_tx_prep_agg(tx, skb, info,
1221 if (unlikely(queued))
1226 if (is_multicast_ether_addr(hdr->addr1)) {
1227 tx->flags &= ~IEEE80211_TX_UNICAST;
1228 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1230 tx->flags |= IEEE80211_TX_UNICAST;
1232 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1233 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1234 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1235 info->flags & IEEE80211_TX_CTL_AMPDU)
1236 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1240 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1241 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1242 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1243 ieee80211_check_fast_xmit(tx->sta);
1246 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1251 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1252 struct ieee80211_vif *vif,
1253 struct sta_info *sta,
1254 struct sk_buff *skb)
1256 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1257 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1258 struct ieee80211_txq *txq = NULL;
1260 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1261 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1264 if (!ieee80211_is_data(hdr->frame_control))
1268 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1273 txq = sta->sta.txq[tid];
1281 return to_txq_info(txq);
1284 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1286 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1289 static u32 codel_skb_len_func(const struct sk_buff *skb)
1294 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1296 const struct ieee80211_tx_info *info;
1298 info = (const struct ieee80211_tx_info *)skb->cb;
1299 return info->control.enqueue_time;
1302 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1305 struct ieee80211_local *local;
1306 struct txq_info *txqi;
1308 struct fq_flow *flow;
1311 local = vif_to_sdata(txqi->txq.vif)->local;
1314 if (cvars == &txqi->def_cvars)
1315 flow = &txqi->def_flow;
1317 flow = &fq->flows[cvars - local->cvars];
1319 return fq_flow_dequeue(fq, flow);
1322 static void codel_drop_func(struct sk_buff *skb,
1325 struct ieee80211_local *local;
1326 struct ieee80211_hw *hw;
1327 struct txq_info *txqi;
1330 local = vif_to_sdata(txqi->txq.vif)->local;
1333 ieee80211_free_txskb(hw, skb);
1336 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1338 struct fq_flow *flow)
1340 struct ieee80211_local *local;
1341 struct txq_info *txqi;
1342 struct codel_vars *cvars;
1343 struct codel_params *cparams;
1344 struct codel_stats *cstats;
1346 local = container_of(fq, struct ieee80211_local, fq);
1347 txqi = container_of(tin, struct txq_info, tin);
1348 cparams = &local->cparams;
1349 cstats = &txqi->cstats;
1351 if (flow == &txqi->def_flow)
1352 cvars = &txqi->def_cvars;
1354 cvars = &local->cvars[flow - fq->flows];
1356 return codel_dequeue(txqi,
1362 codel_skb_time_func,
1364 codel_dequeue_func);
1367 static void fq_skb_free_func(struct fq *fq,
1369 struct fq_flow *flow,
1370 struct sk_buff *skb)
1372 struct ieee80211_local *local;
1374 local = container_of(fq, struct ieee80211_local, fq);
1375 ieee80211_free_txskb(&local->hw, skb);
1378 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1381 struct sk_buff *skb)
1383 struct txq_info *txqi;
1385 txqi = container_of(tin, struct txq_info, tin);
1386 return &txqi->def_flow;
1389 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1390 struct txq_info *txqi,
1391 struct sk_buff *skb)
1393 struct fq *fq = &local->fq;
1394 struct fq_tin *tin = &txqi->tin;
1396 ieee80211_set_skb_enqueue_time(skb);
1397 fq_tin_enqueue(fq, tin, skb,
1399 fq_flow_get_default_func);
1402 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1403 struct sta_info *sta,
1404 struct txq_info *txqi, int tid)
1406 fq_tin_init(&txqi->tin);
1407 fq_flow_init(&txqi->def_flow);
1408 codel_vars_init(&txqi->def_cvars);
1409 codel_stats_init(&txqi->cstats);
1410 __skb_queue_head_init(&txqi->frags);
1412 txqi->txq.vif = &sdata->vif;
1415 txqi->txq.sta = &sta->sta;
1416 sta->sta.txq[tid] = &txqi->txq;
1417 txqi->txq.tid = tid;
1418 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
1420 sdata->vif.txq = &txqi->txq;
1422 txqi->txq.ac = IEEE80211_AC_BE;
1426 void ieee80211_txq_purge(struct ieee80211_local *local,
1427 struct txq_info *txqi)
1429 struct fq *fq = &local->fq;
1430 struct fq_tin *tin = &txqi->tin;
1432 fq_tin_reset(fq, tin, fq_skb_free_func);
1433 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1436 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1438 struct fq *fq = &local->fq;
1441 bool supp_vht = false;
1442 enum nl80211_band band;
1444 if (!local->ops->wake_tx_queue)
1447 ret = fq_init(fq, 4096);
1452 * If the hardware doesn't support VHT, it is safe to limit the maximum
1453 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1455 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1456 struct ieee80211_supported_band *sband;
1458 sband = local->hw.wiphy->bands[band];
1462 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1466 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1468 codel_params_init(&local->cparams);
1469 local->cparams.interval = MS2TIME(100);
1470 local->cparams.target = MS2TIME(20);
1471 local->cparams.ecn = true;
1473 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1475 if (!local->cvars) {
1476 spin_lock_bh(&fq->lock);
1477 fq_reset(fq, fq_skb_free_func);
1478 spin_unlock_bh(&fq->lock);
1482 for (i = 0; i < fq->flows_cnt; i++)
1483 codel_vars_init(&local->cvars[i]);
1488 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1490 struct fq *fq = &local->fq;
1492 if (!local->ops->wake_tx_queue)
1495 kfree(local->cvars);
1496 local->cvars = NULL;
1498 spin_lock_bh(&fq->lock);
1499 fq_reset(fq, fq_skb_free_func);
1500 spin_unlock_bh(&fq->lock);
1503 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1504 struct ieee80211_sub_if_data *sdata,
1505 struct sta_info *sta,
1506 struct sk_buff *skb)
1508 struct fq *fq = &local->fq;
1509 struct ieee80211_vif *vif;
1510 struct txq_info *txqi;
1512 if (!local->ops->wake_tx_queue ||
1513 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1516 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1517 sdata = container_of(sdata->bss,
1518 struct ieee80211_sub_if_data, u.ap);
1521 txqi = ieee80211_get_txq(local, vif, sta, skb);
1526 spin_lock_bh(&fq->lock);
1527 ieee80211_txq_enqueue(local, txqi, skb);
1528 spin_unlock_bh(&fq->lock);
1530 drv_wake_tx_queue(local, txqi);
1535 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1536 struct ieee80211_vif *vif,
1537 struct ieee80211_sta *sta,
1538 struct sk_buff_head *skbs,
1541 struct ieee80211_tx_control control = {};
1542 struct sk_buff *skb, *tmp;
1543 unsigned long flags;
1545 skb_queue_walk_safe(skbs, skb, tmp) {
1546 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1547 int q = info->hw_queue;
1549 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1550 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1551 __skb_unlink(skb, skbs);
1552 ieee80211_free_txskb(&local->hw, skb);
1557 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1558 if (local->queue_stop_reasons[q] ||
1559 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1560 if (unlikely(info->flags &
1561 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1562 if (local->queue_stop_reasons[q] &
1563 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1565 * Drop off-channel frames if queues
1566 * are stopped for any reason other
1567 * than off-channel operation. Never
1570 spin_unlock_irqrestore(
1571 &local->queue_stop_reason_lock,
1573 ieee80211_purge_tx_queue(&local->hw,
1580 * Since queue is stopped, queue up frames for
1581 * later transmission from the tx-pending
1582 * tasklet when the queue is woken again.
1585 skb_queue_splice_init(skbs,
1586 &local->pending[q]);
1588 skb_queue_splice_tail_init(skbs,
1589 &local->pending[q]);
1591 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1596 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1598 info->control.vif = vif;
1601 __skb_unlink(skb, skbs);
1602 drv_tx(local, &control, skb);
1609 * Returns false if the frame couldn't be transmitted but was queued instead.
1611 static bool __ieee80211_tx(struct ieee80211_local *local,
1612 struct sk_buff_head *skbs, int led_len,
1613 struct sta_info *sta, bool txpending)
1615 struct ieee80211_tx_info *info;
1616 struct ieee80211_sub_if_data *sdata;
1617 struct ieee80211_vif *vif;
1618 struct ieee80211_sta *pubsta;
1619 struct sk_buff *skb;
1623 if (WARN_ON(skb_queue_empty(skbs)))
1626 skb = skb_peek(skbs);
1627 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1628 info = IEEE80211_SKB_CB(skb);
1629 sdata = vif_to_sdata(info->control.vif);
1630 if (sta && !sta->uploaded)
1638 switch (sdata->vif.type) {
1639 case NL80211_IFTYPE_MONITOR:
1640 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1644 sdata = rcu_dereference(local->monitor_sdata);
1648 vif->hw_queue[skb_get_queue_mapping(skb)];
1649 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1650 ieee80211_purge_tx_queue(&local->hw, skbs);
1655 case NL80211_IFTYPE_AP_VLAN:
1656 sdata = container_of(sdata->bss,
1657 struct ieee80211_sub_if_data, u.ap);
1664 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1667 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1669 WARN_ON_ONCE(!skb_queue_empty(skbs));
1675 * Invoke TX handlers, return 0 on success and non-zero if the
1676 * frame was dropped or queued.
1678 * The handlers are split into an early and late part. The latter is everything
1679 * that can be sensitive to reordering, and will be deferred to after packets
1680 * are dequeued from the intermediate queues (when they are enabled).
1682 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1684 ieee80211_tx_result res = TX_DROP;
1686 #define CALL_TXH(txh) \
1689 if (res != TX_CONTINUE) \
1693 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1694 CALL_TXH(ieee80211_tx_h_check_assoc);
1695 CALL_TXH(ieee80211_tx_h_ps_buf);
1696 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1697 CALL_TXH(ieee80211_tx_h_select_key);
1698 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1699 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1702 if (unlikely(res == TX_DROP)) {
1703 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1705 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1707 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1709 } else if (unlikely(res == TX_QUEUED)) {
1710 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1718 * Late handlers can be called while the sta lock is held. Handlers that can
1719 * cause packets to be generated will cause deadlock!
1721 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1723 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1724 ieee80211_tx_result res = TX_CONTINUE;
1726 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1727 __skb_queue_tail(&tx->skbs, tx->skb);
1732 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1733 CALL_TXH(ieee80211_tx_h_sequence);
1734 CALL_TXH(ieee80211_tx_h_fragment);
1735 /* handlers after fragment must be aware of tx info fragmentation! */
1736 CALL_TXH(ieee80211_tx_h_stats);
1737 CALL_TXH(ieee80211_tx_h_encrypt);
1738 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1739 CALL_TXH(ieee80211_tx_h_calculate_duration);
1743 if (unlikely(res == TX_DROP)) {
1744 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1746 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1748 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1750 } else if (unlikely(res == TX_QUEUED)) {
1751 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1758 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1760 int r = invoke_tx_handlers_early(tx);
1764 return invoke_tx_handlers_late(tx);
1767 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1768 struct ieee80211_vif *vif, struct sk_buff *skb,
1769 int band, struct ieee80211_sta **sta)
1771 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1772 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1773 struct ieee80211_tx_data tx;
1774 struct sk_buff *skb2;
1776 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1780 info->control.vif = vif;
1781 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1783 if (invoke_tx_handlers(&tx))
1788 *sta = &tx.sta->sta;
1793 /* this function isn't suitable for fragmented data frames */
1794 skb2 = __skb_dequeue(&tx.skbs);
1795 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1796 ieee80211_free_txskb(hw, skb2);
1797 ieee80211_purge_tx_queue(hw, &tx.skbs);
1803 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1806 * Returns false if the frame couldn't be transmitted but was queued instead.
1808 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1809 struct sta_info *sta, struct sk_buff *skb,
1812 struct ieee80211_local *local = sdata->local;
1813 struct ieee80211_tx_data tx;
1814 ieee80211_tx_result res_prepare;
1815 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1819 if (unlikely(skb->len < 10)) {
1824 /* initialises tx */
1826 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1828 if (unlikely(res_prepare == TX_DROP)) {
1829 ieee80211_free_txskb(&local->hw, skb);
1831 } else if (unlikely(res_prepare == TX_QUEUED)) {
1835 /* set up hw_queue value early */
1836 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1837 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1839 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1841 if (invoke_tx_handlers_early(&tx))
1844 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1847 if (!invoke_tx_handlers_late(&tx))
1848 result = __ieee80211_tx(local, &tx.skbs, led_len,
1854 /* device xmit handlers */
1856 enum ieee80211_encrypt {
1862 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1863 struct sk_buff *skb,
1865 enum ieee80211_encrypt encrypt)
1867 struct ieee80211_local *local = sdata->local;
1871 enc_tailroom = encrypt == ENCRYPT_MGMT ||
1872 (encrypt == ENCRYPT_DATA &&
1873 sdata->crypto_tx_tailroom_needed_cnt);
1876 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1877 tail_need -= skb_tailroom(skb);
1878 tail_need = max_t(int, tail_need, 0);
1881 if (skb_cloned(skb) &&
1882 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1883 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
1884 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1885 else if (head_need || tail_need)
1886 I802_DEBUG_INC(local->tx_expand_skb_head);
1890 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1891 wiphy_debug(local->hw.wiphy,
1892 "failed to reallocate TX buffer\n");
1899 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1900 struct sta_info *sta, struct sk_buff *skb)
1902 struct ieee80211_local *local = sdata->local;
1903 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1904 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1906 enum ieee80211_encrypt encrypt;
1908 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)
1909 encrypt = ENCRYPT_NO;
1910 else if (ieee80211_is_mgmt(hdr->frame_control))
1911 encrypt = ENCRYPT_MGMT;
1913 encrypt = ENCRYPT_DATA;
1915 headroom = local->tx_headroom;
1916 if (encrypt != ENCRYPT_NO)
1917 headroom += sdata->encrypt_headroom;
1918 headroom -= skb_headroom(skb);
1919 headroom = max_t(int, 0, headroom);
1921 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) {
1922 ieee80211_free_txskb(&local->hw, skb);
1926 /* reload after potential resize */
1927 hdr = (struct ieee80211_hdr *) skb->data;
1928 info->control.vif = &sdata->vif;
1930 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1931 if (ieee80211_is_data(hdr->frame_control) &&
1932 is_unicast_ether_addr(hdr->addr1)) {
1933 if (mesh_nexthop_resolve(sdata, skb))
1934 return; /* skb queued: don't free */
1936 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1940 ieee80211_set_qos_hdr(sdata, skb);
1941 ieee80211_tx(sdata, sta, skb, false);
1944 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1945 struct sk_buff *skb)
1947 struct ieee80211_radiotap_iterator iterator;
1948 struct ieee80211_radiotap_header *rthdr =
1949 (struct ieee80211_radiotap_header *) skb->data;
1950 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1951 struct ieee80211_supported_band *sband =
1952 local->hw.wiphy->bands[info->band];
1953 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1957 bool rate_found = false;
1958 u8 rate_retries = 0;
1960 u8 mcs_known, mcs_flags, mcs_bw;
1962 u8 vht_mcs = 0, vht_nss = 0;
1965 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1966 IEEE80211_TX_CTL_DONTFRAG;
1969 * for every radiotap entry that is present
1970 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1971 * entries present, or -EINVAL on error)
1975 ret = ieee80211_radiotap_iterator_next(&iterator);
1980 /* see if this argument is something we can use */
1981 switch (iterator.this_arg_index) {
1983 * You must take care when dereferencing iterator.this_arg
1984 * for multibyte types... the pointer is not aligned. Use
1985 * get_unaligned((type *)iterator.this_arg) to dereference
1986 * iterator.this_arg for type "type" safely on all arches.
1988 case IEEE80211_RADIOTAP_FLAGS:
1989 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1991 * this indicates that the skb we have been
1992 * handed has the 32-bit FCS CRC at the end...
1993 * we should react to that by snipping it off
1994 * because it will be recomputed and added
1997 if (skb->len < (iterator._max_length + FCS_LEN))
2000 skb_trim(skb, skb->len - FCS_LEN);
2002 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2003 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2004 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2005 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2008 case IEEE80211_RADIOTAP_TX_FLAGS:
2009 txflags = get_unaligned_le16(iterator.this_arg);
2010 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2011 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2014 case IEEE80211_RADIOTAP_RATE:
2015 rate = *iterator.this_arg;
2020 case IEEE80211_RADIOTAP_DATA_RETRIES:
2021 rate_retries = *iterator.this_arg;
2024 case IEEE80211_RADIOTAP_MCS:
2025 mcs_known = iterator.this_arg[0];
2026 mcs_flags = iterator.this_arg[1];
2027 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2031 rate = iterator.this_arg[2];
2032 rate_flags = IEEE80211_TX_RC_MCS;
2034 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2035 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2036 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2038 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2039 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2040 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2041 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2044 case IEEE80211_RADIOTAP_VHT:
2045 vht_known = get_unaligned_le16(iterator.this_arg);
2048 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2049 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2050 (iterator.this_arg[2] &
2051 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2052 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2054 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2055 if (iterator.this_arg[3] == 1)
2057 IEEE80211_TX_RC_40_MHZ_WIDTH;
2058 else if (iterator.this_arg[3] == 4)
2060 IEEE80211_TX_RC_80_MHZ_WIDTH;
2061 else if (iterator.this_arg[3] == 11)
2063 IEEE80211_TX_RC_160_MHZ_WIDTH;
2066 vht_mcs = iterator.this_arg[4] >> 4;
2067 vht_nss = iterator.this_arg[4] & 0xF;
2071 * Please update the file
2072 * Documentation/networking/mac80211-injection.txt
2073 * when parsing new fields here.
2081 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2085 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2087 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2088 info->control.rates[i].idx = -1;
2089 info->control.rates[i].flags = 0;
2090 info->control.rates[i].count = 0;
2093 if (rate_flags & IEEE80211_TX_RC_MCS) {
2094 info->control.rates[0].idx = rate;
2095 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2096 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2099 for (i = 0; i < sband->n_bitrates; i++) {
2100 if (rate * 5 != sband->bitrates[i].bitrate)
2103 info->control.rates[0].idx = i;
2108 if (info->control.rates[0].idx < 0)
2109 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2111 info->control.rates[0].flags = rate_flags;
2112 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2113 local->hw.max_rate_tries);
2117 * remove the radiotap header
2118 * iterator->_max_length was sanity-checked against
2119 * skb->len by iterator init
2121 skb_pull(skb, iterator._max_length);
2126 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2127 struct net_device *dev)
2129 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2130 struct ieee80211_chanctx_conf *chanctx_conf;
2131 struct ieee80211_radiotap_header *prthdr =
2132 (struct ieee80211_radiotap_header *)skb->data;
2133 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2134 struct ieee80211_hdr *hdr;
2135 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2136 struct cfg80211_chan_def *chandef;
2140 /* check for not even having the fixed radiotap header part */
2141 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2142 goto fail; /* too short to be possibly valid */
2144 /* is it a header version we can trust to find length from? */
2145 if (unlikely(prthdr->it_version))
2146 goto fail; /* only version 0 is supported */
2148 /* then there must be a radiotap header with a length we can use */
2149 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2151 /* does the skb contain enough to deliver on the alleged length? */
2152 if (unlikely(skb->len < len_rthdr))
2153 goto fail; /* skb too short for claimed rt header extent */
2156 * fix up the pointers accounting for the radiotap
2157 * header still being in there. We are being given
2158 * a precooked IEEE80211 header so no need for
2161 skb_set_mac_header(skb, len_rthdr);
2163 * these are just fixed to the end of the rt area since we
2164 * don't have any better information and at this point, nobody cares
2166 skb_set_network_header(skb, len_rthdr);
2167 skb_set_transport_header(skb, len_rthdr);
2169 if (skb->len < len_rthdr + 2)
2172 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2173 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2175 if (skb->len < len_rthdr + hdrlen)
2179 * Initialize skb->protocol if the injected frame is a data frame
2180 * carrying a rfc1042 header
2182 if (ieee80211_is_data(hdr->frame_control) &&
2183 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2184 u8 *payload = (u8 *)hdr + hdrlen;
2186 if (ether_addr_equal(payload, rfc1042_header))
2187 skb->protocol = cpu_to_be16((payload[6] << 8) |
2191 memset(info, 0, sizeof(*info));
2193 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2194 IEEE80211_TX_CTL_INJECTED;
2199 * We process outgoing injected frames that have a local address
2200 * we handle as though they are non-injected frames.
2201 * This code here isn't entirely correct, the local MAC address
2202 * isn't always enough to find the interface to use; for proper
2203 * VLAN/WDS support we will need a different mechanism (which
2204 * likely isn't going to be monitor interfaces).
2206 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2208 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2209 if (!ieee80211_sdata_running(tmp_sdata))
2211 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2212 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2213 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2215 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2221 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2222 if (!chanctx_conf) {
2223 tmp_sdata = rcu_dereference(local->monitor_sdata);
2226 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2230 chandef = &chanctx_conf->def;
2231 else if (!local->use_chanctx)
2232 chandef = &local->_oper_chandef;
2237 * Frame injection is not allowed if beaconing is not allowed
2238 * or if we need radar detection. Beaconing is usually not allowed when
2239 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2240 * Passive scan is also used in world regulatory domains where
2241 * your country is not known and as such it should be treated as
2242 * NO TX unless the channel is explicitly allowed in which case
2243 * your current regulatory domain would not have the passive scan
2246 * Since AP mode uses monitor interfaces to inject/TX management
2247 * frames we can make AP mode the exception to this rule once it
2248 * supports radar detection as its implementation can deal with
2249 * radar detection by itself. We can do that later by adding a
2250 * monitor flag interfaces used for AP support.
2252 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2256 info->band = chandef->chan->band;
2258 /* process and remove the injection radiotap header */
2259 if (!ieee80211_parse_tx_radiotap(local, skb))
2262 ieee80211_xmit(sdata, NULL, skb);
2265 return NETDEV_TX_OK;
2271 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2274 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2276 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2278 return ethertype == ETH_P_TDLS &&
2280 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2283 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2284 struct sk_buff *skb,
2285 struct sta_info **sta_out)
2287 struct sta_info *sta;
2289 switch (sdata->vif.type) {
2290 case NL80211_IFTYPE_AP_VLAN:
2291 sta = rcu_dereference(sdata->u.vlan.sta);
2295 } else if (sdata->wdev.use_4addr) {
2299 case NL80211_IFTYPE_AP:
2300 case NL80211_IFTYPE_OCB:
2301 case NL80211_IFTYPE_ADHOC:
2302 if (is_multicast_ether_addr(skb->data)) {
2303 *sta_out = ERR_PTR(-ENOENT);
2306 sta = sta_info_get_bss(sdata, skb->data);
2308 case NL80211_IFTYPE_WDS:
2309 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2311 #ifdef CONFIG_MAC80211_MESH
2312 case NL80211_IFTYPE_MESH_POINT:
2313 /* determined much later */
2317 case NL80211_IFTYPE_STATION:
2318 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2319 sta = sta_info_get(sdata, skb->data);
2320 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2321 if (test_sta_flag(sta,
2322 WLAN_STA_TDLS_PEER_AUTH)) {
2328 * TDLS link during setup - throw out frames to
2329 * peer. Allow TDLS-setup frames to unauthorized
2330 * peers for the special case of a link teardown
2331 * after a TDLS sta is removed due to being
2334 if (!ieee80211_is_tdls_setup(skb))
2340 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2348 *sta_out = sta ?: ERR_PTR(-ENOENT);
2353 * ieee80211_build_hdr - build 802.11 header in the given frame
2354 * @sdata: virtual interface to build the header for
2355 * @skb: the skb to build the header in
2356 * @info_flags: skb flags to set
2358 * This function takes the skb with 802.3 header and reformats the header to
2359 * the appropriate IEEE 802.11 header based on which interface the packet is
2360 * being transmitted on.
2362 * Note that this function also takes care of the TX status request and
2363 * potential unsharing of the SKB - this needs to be interleaved with the
2366 * The function requires the read-side RCU lock held
2368 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2370 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2371 struct sk_buff *skb, u32 info_flags,
2372 struct sta_info *sta)
2374 struct ieee80211_local *local = sdata->local;
2375 struct ieee80211_tx_info *info;
2377 u16 ethertype, hdrlen, meshhdrlen = 0;
2379 struct ieee80211_hdr hdr;
2380 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2381 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2382 const u8 *encaps_data;
2383 int encaps_len, skip_header_bytes;
2384 bool wme_sta = false, authorized = false;
2388 struct ieee80211_chanctx_conf *chanctx_conf;
2389 struct ieee80211_sub_if_data *ap_sdata;
2390 enum nl80211_band band;
2396 /* convert Ethernet header to proper 802.11 header (based on
2397 * operation mode) */
2398 ethertype = (skb->data[12] << 8) | skb->data[13];
2399 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2401 switch (sdata->vif.type) {
2402 case NL80211_IFTYPE_AP_VLAN:
2403 if (sdata->wdev.use_4addr) {
2404 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2406 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2407 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2408 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2409 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2411 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2412 wme_sta = sta->sta.wme;
2414 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2416 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2417 if (!chanctx_conf) {
2421 band = chanctx_conf->def.chan->band;
2422 if (sdata->wdev.use_4addr)
2425 case NL80211_IFTYPE_AP:
2426 if (sdata->vif.type == NL80211_IFTYPE_AP)
2427 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2428 if (!chanctx_conf) {
2432 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2434 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2435 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2436 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2438 band = chanctx_conf->def.chan->band;
2440 case NL80211_IFTYPE_WDS:
2441 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2443 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2444 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2445 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2446 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2449 * This is the exception! WDS style interfaces are prohibited
2450 * when channel contexts are in used so this must be valid
2452 band = local->hw.conf.chandef.chan->band;
2454 #ifdef CONFIG_MAC80211_MESH
2455 case NL80211_IFTYPE_MESH_POINT:
2456 if (!is_multicast_ether_addr(skb->data)) {
2457 struct sta_info *next_hop;
2458 bool mpp_lookup = true;
2460 mpath = mesh_path_lookup(sdata, skb->data);
2463 next_hop = rcu_dereference(mpath->next_hop);
2465 !(mpath->flags & (MESH_PATH_ACTIVE |
2466 MESH_PATH_RESOLVING)))
2471 mppath = mpp_path_lookup(sdata, skb->data);
2473 mppath->exp_time = jiffies;
2476 if (mppath && mpath)
2477 mesh_path_del(sdata, mpath->dst);
2481 * Use address extension if it is a packet from
2482 * another interface or if we know the destination
2483 * is being proxied by a portal (i.e. portal address
2484 * differs from proxied address)
2486 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2487 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2488 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2489 skb->data, skb->data + ETH_ALEN);
2490 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2493 /* DS -> MBSS (802.11-2012 13.11.3.3).
2494 * For unicast with unknown forwarding information,
2495 * destination might be in the MBSS or if that fails
2496 * forwarded to another mesh gate. In either case
2497 * resolution will be handled in ieee80211_xmit(), so
2498 * leave the original DA. This also works for mcast */
2499 const u8 *mesh_da = skb->data;
2502 mesh_da = mppath->mpp;
2504 mesh_da = mpath->dst;
2506 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2507 mesh_da, sdata->vif.addr);
2508 if (is_multicast_ether_addr(mesh_da))
2509 /* DA TA mSA AE:SA */
2510 meshhdrlen = ieee80211_new_mesh_header(
2512 skb->data + ETH_ALEN, NULL);
2514 /* RA TA mDA mSA AE:DA SA */
2515 meshhdrlen = ieee80211_new_mesh_header(
2516 sdata, &mesh_hdr, skb->data,
2517 skb->data + ETH_ALEN);
2520 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2521 if (!chanctx_conf) {
2525 band = chanctx_conf->def.chan->band;
2528 case NL80211_IFTYPE_STATION:
2529 /* we already did checks when looking up the RA STA */
2530 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2534 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2535 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2536 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2538 } else if (sdata->u.mgd.use_4addr &&
2539 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2540 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2541 IEEE80211_FCTL_TODS);
2543 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2544 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2545 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2546 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2549 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2551 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2552 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2553 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2556 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2557 if (!chanctx_conf) {
2561 band = chanctx_conf->def.chan->band;
2563 case NL80211_IFTYPE_OCB:
2565 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2566 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2567 eth_broadcast_addr(hdr.addr3);
2569 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2570 if (!chanctx_conf) {
2574 band = chanctx_conf->def.chan->band;
2576 case NL80211_IFTYPE_ADHOC:
2578 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2579 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2580 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2582 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2583 if (!chanctx_conf) {
2587 band = chanctx_conf->def.chan->band;
2594 multicast = is_multicast_ether_addr(hdr.addr1);
2596 /* sta is always NULL for mesh */
2598 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2599 wme_sta = sta->sta.wme;
2600 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2601 /* For mesh, the use of the QoS header is mandatory */
2605 /* receiver does QoS (which also means we do) use it */
2607 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2612 * Drop unicast frames to unauthorised stations unless they are
2613 * EAPOL frames from the local station.
2615 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2616 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2617 !multicast && !authorized &&
2618 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2619 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2620 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2621 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2622 sdata->name, hdr.addr1);
2625 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2631 if (unlikely(!multicast && skb->sk &&
2632 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2633 struct sk_buff *ack_skb = skb_clone_sk(skb);
2636 unsigned long flags;
2639 spin_lock_irqsave(&local->ack_status_lock, flags);
2640 id = idr_alloc(&local->ack_status_frames, ack_skb,
2641 1, 0x10000, GFP_ATOMIC);
2642 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2646 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2654 * If the skb is shared we need to obtain our own copy.
2656 if (skb_shared(skb)) {
2657 struct sk_buff *tmp_skb = skb;
2659 /* can't happen -- skb is a clone if info_id != 0 */
2662 skb = skb_clone(skb, GFP_ATOMIC);
2671 hdr.frame_control = fc;
2672 hdr.duration_id = 0;
2675 skip_header_bytes = ETH_HLEN;
2676 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2677 encaps_data = bridge_tunnel_header;
2678 encaps_len = sizeof(bridge_tunnel_header);
2679 skip_header_bytes -= 2;
2680 } else if (ethertype >= ETH_P_802_3_MIN) {
2681 encaps_data = rfc1042_header;
2682 encaps_len = sizeof(rfc1042_header);
2683 skip_header_bytes -= 2;
2689 skb_pull(skb, skip_header_bytes);
2690 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2693 * So we need to modify the skb header and hence need a copy of
2694 * that. The head_need variable above doesn't, so far, include
2695 * the needed header space that we don't need right away. If we
2696 * can, then we don't reallocate right now but only after the
2697 * frame arrives at the master device (if it does...)
2699 * If we cannot, however, then we will reallocate to include all
2700 * the ever needed space. Also, if we need to reallocate it anyway,
2701 * make it big enough for everything we may ever need.
2704 if (head_need > 0 || skb_cloned(skb)) {
2705 head_need += sdata->encrypt_headroom;
2706 head_need += local->tx_headroom;
2707 head_need = max_t(int, 0, head_need);
2708 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) {
2709 ieee80211_free_txskb(&local->hw, skb);
2711 return ERR_PTR(-ENOMEM);
2716 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2718 #ifdef CONFIG_MAC80211_MESH
2720 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2723 if (ieee80211_is_data_qos(fc)) {
2724 __le16 *qos_control;
2726 qos_control = (__le16 *) skb_push(skb, 2);
2727 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2729 * Maybe we could actually set some fields here, for now just
2730 * initialise to zero to indicate no special operation.
2734 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2736 skb_reset_mac_header(skb);
2738 info = IEEE80211_SKB_CB(skb);
2739 memset(info, 0, sizeof(*info));
2741 info->flags = info_flags;
2742 info->ack_frame_id = info_id;
2748 return ERR_PTR(ret);
2752 * fast-xmit overview
2754 * The core idea of this fast-xmit is to remove per-packet checks by checking
2755 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2756 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2757 * much less work can be done per packet. For example, fragmentation must be
2758 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2761 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2762 * header and other data to aid packet processing in ieee80211_xmit_fast().
2764 * The most difficult part of this is that when any of these assumptions
2765 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2766 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2767 * since the per-packet code no longer checks the conditions. This is reflected
2768 * by the calls to these functions throughout the rest of the code, and must be
2769 * maintained if any of the TX path checks change.
2772 void ieee80211_check_fast_xmit(struct sta_info *sta)
2774 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2775 struct ieee80211_local *local = sta->local;
2776 struct ieee80211_sub_if_data *sdata = sta->sdata;
2777 struct ieee80211_hdr *hdr = (void *)build.hdr;
2778 struct ieee80211_chanctx_conf *chanctx_conf;
2781 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2784 /* Locking here protects both the pointer itself, and against concurrent
2785 * invocations winning data access races to, e.g., the key pointer that
2787 * Without it, the invocation of this function right after the key
2788 * pointer changes wouldn't be sufficient, as another CPU could access
2789 * the pointer, then stall, and then do the cache update after the CPU
2790 * that invalidated the key.
2791 * With the locking, such scenarios cannot happen as the check for the
2792 * key and the fast-tx assignment are done atomically, so the CPU that
2793 * modifies the key will either wait or other one will see the key
2794 * cleared/changed already.
2796 spin_lock_bh(&sta->lock);
2797 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2798 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2799 sdata->vif.type == NL80211_IFTYPE_STATION)
2802 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2805 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2806 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2807 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2808 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2811 if (sdata->noack_map)
2814 /* fast-xmit doesn't handle fragmentation at all */
2815 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2816 !local->ops->set_frag_threshold)
2820 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2821 if (!chanctx_conf) {
2825 build.band = chanctx_conf->def.chan->band;
2828 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2830 switch (sdata->vif.type) {
2831 case NL80211_IFTYPE_ADHOC:
2833 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2834 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2835 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2838 case NL80211_IFTYPE_STATION:
2839 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2841 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2842 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2843 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2848 if (sdata->u.mgd.use_4addr) {
2849 /* non-regular ethertype cannot use the fastpath */
2850 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2851 IEEE80211_FCTL_TODS);
2853 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2854 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2855 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2856 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2860 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2862 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2863 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2864 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2867 case NL80211_IFTYPE_AP_VLAN:
2868 if (sdata->wdev.use_4addr) {
2869 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2870 IEEE80211_FCTL_TODS);
2872 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2873 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2874 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2875 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2880 case NL80211_IFTYPE_AP:
2881 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2883 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2884 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2885 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2889 /* not handled on fast-xmit */
2895 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2898 /* We store the key here so there's no point in using rcu_dereference()
2899 * but that's fine because the code that changes the pointers will call
2900 * this function after doing so. For a single CPU that would be enough,
2901 * for multiple see the comment above.
2903 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2905 build.key = rcu_access_pointer(sdata->default_unicast_key);
2907 bool gen_iv, iv_spc, mmic;
2909 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2910 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2911 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2913 /* don't handle software crypto */
2914 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2917 switch (build.key->conf.cipher) {
2918 case WLAN_CIPHER_SUITE_CCMP:
2919 case WLAN_CIPHER_SUITE_CCMP_256:
2920 /* add fixed key ID */
2922 (build.hdr + build.hdr_len)[3] =
2923 0x20 | (build.key->conf.keyidx << 6);
2924 build.pn_offs = build.hdr_len;
2926 if (gen_iv || iv_spc)
2927 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2929 case WLAN_CIPHER_SUITE_GCMP:
2930 case WLAN_CIPHER_SUITE_GCMP_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_GCMP_HDR_LEN;
2940 case WLAN_CIPHER_SUITE_TKIP:
2941 /* cannot handle MMIC or IV generation in xmit-fast */
2945 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2947 case WLAN_CIPHER_SUITE_WEP40:
2948 case WLAN_CIPHER_SUITE_WEP104:
2949 /* cannot handle IV generation in fast-xmit */
2953 build.hdr_len += IEEE80211_WEP_IV_LEN;
2955 case WLAN_CIPHER_SUITE_AES_CMAC:
2956 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2957 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2958 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2960 "management cipher suite 0x%x enabled for data\n",
2961 build.key->conf.cipher);
2964 /* we don't know how to generate IVs for this at all */
2965 if (WARN_ON(gen_iv))
2967 /* pure hardware keys are OK, of course */
2968 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2970 /* cipher scheme might require space allocation */
2972 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2975 build.hdr_len += build.key->conf.iv_len;
2978 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2981 hdr->frame_control = fc;
2983 memcpy(build.hdr + build.hdr_len,
2984 rfc1042_header, sizeof(rfc1042_header));
2985 build.hdr_len += sizeof(rfc1042_header);
2987 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2988 /* if the kmemdup fails, continue w/o fast_tx */
2993 /* we might have raced against another call to this function */
2994 old = rcu_dereference_protected(sta->fast_tx,
2995 lockdep_is_held(&sta->lock));
2996 rcu_assign_pointer(sta->fast_tx, fast_tx);
2998 kfree_rcu(old, rcu_head);
2999 spin_unlock_bh(&sta->lock);
3002 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3004 struct sta_info *sta;
3007 list_for_each_entry_rcu(sta, &local->sta_list, list)
3008 ieee80211_check_fast_xmit(sta);
3012 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3014 struct ieee80211_local *local = sdata->local;
3015 struct sta_info *sta;
3019 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3020 if (sdata != sta->sdata &&
3021 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3023 ieee80211_check_fast_xmit(sta);
3029 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3031 struct ieee80211_fast_tx *fast_tx;
3033 spin_lock_bh(&sta->lock);
3034 fast_tx = rcu_dereference_protected(sta->fast_tx,
3035 lockdep_is_held(&sta->lock));
3036 RCU_INIT_POINTER(sta->fast_tx, NULL);
3037 spin_unlock_bh(&sta->lock);
3040 kfree_rcu(fast_tx, rcu_head);
3043 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3044 struct sk_buff *skb, int headroom,
3047 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3048 int padding = (4 - amsdu_len) & 3;
3050 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3051 I802_DEBUG_INC(local->tx_expand_skb_head);
3053 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3054 wiphy_debug(local->hw.wiphy,
3055 "failed to reallocate TX buffer\n");
3061 *subframe_len += padding;
3062 memset(skb_put(skb, padding), 0, padding);
3068 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3069 struct ieee80211_fast_tx *fast_tx,
3070 struct sk_buff *skb)
3072 struct ieee80211_local *local = sdata->local;
3073 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3074 struct ieee80211_hdr *hdr;
3075 struct ethhdr amsdu_hdr;
3076 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3077 int subframe_len = skb->len - hdr_len;
3081 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3084 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3087 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(amsdu_hdr),
3091 amsdu_hdr.h_proto = cpu_to_be16(subframe_len);
3092 memcpy(amsdu_hdr.h_source, skb->data + fast_tx->sa_offs, ETH_ALEN);
3093 memcpy(amsdu_hdr.h_dest, skb->data + fast_tx->da_offs, ETH_ALEN);
3095 data = skb_push(skb, sizeof(amsdu_hdr));
3096 memmove(data, data + sizeof(amsdu_hdr), hdr_len);
3097 memcpy(data + hdr_len, &amsdu_hdr, sizeof(amsdu_hdr));
3100 qc = ieee80211_get_qos_ctl(hdr);
3101 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3103 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3108 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3109 struct sta_info *sta,
3110 struct ieee80211_fast_tx *fast_tx,
3111 struct sk_buff *skb)
3113 struct ieee80211_local *local = sdata->local;
3114 struct fq *fq = &local->fq;
3116 struct fq_flow *flow;
3117 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3118 struct ieee80211_txq *txq = sta->sta.txq[tid];
3119 struct txq_info *txqi;
3120 struct sk_buff **frag_tail, *head;
3121 int subframe_len = skb->len - ETH_ALEN;
3122 u8 max_subframes = sta->sta.max_amsdu_subframes;
3123 int max_frags = local->hw.max_tx_fragments;
3124 int max_amsdu_len = sta->sta.max_amsdu_len;
3128 unsigned int orig_len;
3131 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3137 txqi = to_txq_info(txq);
3138 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3141 if (sta->sta.max_rc_amsdu_len)
3142 max_amsdu_len = min_t(int, max_amsdu_len,
3143 sta->sta.max_rc_amsdu_len);
3145 spin_lock_bh(&fq->lock);
3147 /* TODO: Ideally aggregation should be done on dequeue to remain
3148 * responsive to environment changes.
3152 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3153 head = skb_peek_tail(&flow->queue);
3157 orig_len = head->len;
3159 if (skb->len + head->len > max_amsdu_len)
3162 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3165 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3166 nfrags += 1 + skb_shinfo(head)->nr_frags;
3167 frag_tail = &skb_shinfo(head)->frag_list;
3168 while (*frag_tail) {
3169 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3170 frag_tail = &(*frag_tail)->next;
3174 if (max_subframes && n > max_subframes)
3177 if (max_frags && nfrags > max_frags)
3180 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3185 data = skb_push(skb, ETH_ALEN + 2);
3186 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3188 data += 2 * ETH_ALEN;
3189 len = cpu_to_be16(subframe_len);
3190 memcpy(data, &len, 2);
3191 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3193 head->len += skb->len;
3194 head->data_len += skb->len;
3197 flow->backlog += head->len - orig_len;
3198 tin->backlog_bytes += head->len - orig_len;
3200 fq_recalc_backlog(fq, tin, flow);
3203 spin_unlock_bh(&fq->lock);
3209 * Can be called while the sta lock is held. Anything that can cause packets to
3210 * be generated will cause deadlock!
3212 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3213 struct sta_info *sta, u8 pn_offs,
3214 struct ieee80211_key *key,
3215 struct sk_buff *skb)
3217 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3218 struct ieee80211_hdr *hdr = (void *)skb->data;
3219 u8 tid = IEEE80211_NUM_TIDS;
3222 info->control.hw_key = &key->conf;
3224 ieee80211_tx_stats(skb->dev, skb->len);
3226 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3227 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3228 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3230 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3231 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3232 sdata->sequence_number += 0x10;
3235 if (skb_shinfo(skb)->gso_size)
3236 sta->tx_stats.msdu[tid] +=
3237 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3239 sta->tx_stats.msdu[tid]++;
3241 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3243 /* statistics normally done by ieee80211_tx_h_stats (but that
3244 * has to consider fragmentation, so is more complex)
3246 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3247 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3251 u8 *crypto_hdr = skb->data + pn_offs;
3253 switch (key->conf.cipher) {
3254 case WLAN_CIPHER_SUITE_CCMP:
3255 case WLAN_CIPHER_SUITE_CCMP_256:
3256 case WLAN_CIPHER_SUITE_GCMP:
3257 case WLAN_CIPHER_SUITE_GCMP_256:
3258 pn = atomic64_inc_return(&key->conf.tx_pn);
3260 crypto_hdr[1] = pn >> 8;
3261 crypto_hdr[4] = pn >> 16;
3262 crypto_hdr[5] = pn >> 24;
3263 crypto_hdr[6] = pn >> 32;
3264 crypto_hdr[7] = pn >> 40;
3270 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3271 struct sta_info *sta,
3272 struct ieee80211_fast_tx *fast_tx,
3273 struct sk_buff *skb)
3275 struct ieee80211_local *local = sdata->local;
3276 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3277 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3278 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3280 struct ieee80211_tx_info *info;
3281 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3282 struct ieee80211_tx_data tx;
3283 ieee80211_tx_result r;
3284 struct tid_ampdu_tx *tid_tx = NULL;
3285 u8 tid = IEEE80211_NUM_TIDS;
3287 /* control port protocol needs a lot of special handling */
3288 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3291 /* only RFC 1042 SNAP */
3292 if (ethertype < ETH_P_802_3_MIN)
3295 /* don't handle TX status request here either */
3296 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3299 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3300 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3301 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3303 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3305 if (tid_tx->timeout)
3306 tid_tx->last_tx = jiffies;
3310 /* after this point (skb is modified) we cannot return false */
3312 if (skb_shared(skb)) {
3313 struct sk_buff *tmp_skb = skb;
3315 skb = skb_clone(skb, GFP_ATOMIC);
3322 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3323 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3326 /* will not be crypto-handled beyond what we do here, so use false
3327 * as the may-encrypt argument for the resize to not account for
3328 * more room than we already have in 'extra_head'
3330 if (unlikely(ieee80211_skb_resize(sdata, skb,
3331 max_t(int, extra_head + hw_headroom -
3332 skb_headroom(skb), 0),
3338 memcpy(ð, skb->data, ETH_HLEN - 2);
3339 hdr = (void *)skb_push(skb, extra_head);
3340 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3341 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3342 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3344 info = IEEE80211_SKB_CB(skb);
3345 memset(info, 0, sizeof(*info));
3346 info->band = fast_tx->band;
3347 info->control.vif = &sdata->vif;
3348 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3349 IEEE80211_TX_CTL_DONTFRAG |
3350 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3351 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3353 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3354 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3355 *ieee80211_get_qos_ctl(hdr) = tid;
3358 __skb_queue_head_init(&tx.skbs);
3360 tx.flags = IEEE80211_TX_UNICAST;
3364 tx.key = fast_tx->key;
3366 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3368 r = ieee80211_tx_h_rate_ctrl(&tx);
3372 if (r != TX_CONTINUE) {
3379 if (ieee80211_queue_skb(local, sdata, sta, skb))
3382 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3385 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3386 sdata = container_of(sdata->bss,
3387 struct ieee80211_sub_if_data, u.ap);
3389 __skb_queue_tail(&tx.skbs, skb);
3390 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3394 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3395 struct ieee80211_txq *txq)
3397 struct ieee80211_local *local = hw_to_local(hw);
3398 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3399 struct ieee80211_hdr *hdr;
3400 struct sk_buff *skb = NULL;
3401 struct fq *fq = &local->fq;
3402 struct fq_tin *tin = &txqi->tin;
3403 struct ieee80211_tx_info *info;
3404 struct ieee80211_tx_data tx;
3405 ieee80211_tx_result r;
3406 struct ieee80211_vif *vif;
3408 spin_lock_bh(&fq->lock);
3410 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3413 /* Make sure fragments stay together. */
3414 skb = __skb_dequeue(&txqi->frags);
3419 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3423 hdr = (struct ieee80211_hdr *)skb->data;
3424 info = IEEE80211_SKB_CB(skb);
3426 memset(&tx, 0, sizeof(tx));
3427 __skb_queue_head_init(&tx.skbs);
3430 tx.sdata = vif_to_sdata(info->control.vif);
3433 tx.sta = container_of(txq->sta, struct sta_info, sta);
3435 * Drop unicast frames to unauthorised stations unless they are
3436 * EAPOL frames from the local station.
3438 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
3439 !ieee80211_vif_is_mesh(&tx.sdata->vif) &&
3440 tx.sdata->vif.type != NL80211_IFTYPE_OCB &&
3441 !is_multicast_ether_addr(hdr->addr1) &&
3442 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) &&
3443 (!(info->control.flags &
3444 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) ||
3445 !ether_addr_equal(tx.sdata->vif.addr,
3447 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
3448 ieee80211_free_txskb(&local->hw, skb);
3454 * The key can be removed while the packet was queued, so need to call
3455 * this here to get the current key.
3457 r = ieee80211_tx_h_select_key(&tx);
3458 if (r != TX_CONTINUE) {
3459 ieee80211_free_txskb(&local->hw, skb);
3463 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3464 info->flags |= IEEE80211_TX_CTL_AMPDU;
3466 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3468 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3469 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3474 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3475 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3477 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3480 if (invoke_tx_handlers_late(&tx))
3483 skb = __skb_dequeue(&tx.skbs);
3485 if (!skb_queue_empty(&tx.skbs))
3486 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3489 if (skb && skb_has_frag_list(skb) &&
3490 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3491 if (skb_linearize(skb)) {
3492 ieee80211_free_txskb(&local->hw, skb);
3497 switch (tx.sdata->vif.type) {
3498 case NL80211_IFTYPE_MONITOR:
3499 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3500 vif = &tx.sdata->vif;
3503 tx.sdata = rcu_dereference(local->monitor_sdata);
3505 vif = &tx.sdata->vif;
3507 vif->hw_queue[skb_get_queue_mapping(skb)];
3508 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3509 ieee80211_free_txskb(&local->hw, skb);
3515 case NL80211_IFTYPE_AP_VLAN:
3516 tx.sdata = container_of(tx.sdata->bss,
3517 struct ieee80211_sub_if_data, u.ap);
3520 vif = &tx.sdata->vif;
3524 IEEE80211_SKB_CB(skb)->control.vif = vif;
3526 spin_unlock_bh(&fq->lock);
3530 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3532 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3533 struct net_device *dev,
3536 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3537 struct sta_info *sta;
3538 struct sk_buff *next;
3540 if (unlikely(skb->len < ETH_HLEN)) {
3547 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3550 if (!IS_ERR_OR_NULL(sta)) {
3551 struct ieee80211_fast_tx *fast_tx;
3553 fast_tx = rcu_dereference(sta->fast_tx);
3556 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3560 if (skb_is_gso(skb)) {
3561 struct sk_buff *segs;
3563 segs = skb_gso_segment(skb, 0);
3571 /* we cannot process non-linear frames on this path */
3572 if (skb_linearize(skb)) {
3577 /* the frame could be fragmented, software-encrypted, and other
3578 * things so we cannot really handle checksum offload with it -
3579 * fix it up in software before we handle anything else.
3581 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3582 skb_set_transport_header(skb,
3583 skb_checksum_start_offset(skb));
3584 if (skb_checksum_help(skb))
3597 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3601 ieee80211_tx_stats(dev, skb->len);
3603 ieee80211_xmit(sdata, sta, skb);
3613 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3614 * @skb: packet to be sent
3615 * @dev: incoming interface
3617 * On failure skb will be freed.
3619 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3620 struct net_device *dev)
3622 __ieee80211_subif_start_xmit(skb, dev, 0);
3623 return NETDEV_TX_OK;
3627 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3628 struct sk_buff *skb, u32 info_flags)
3630 struct ieee80211_hdr *hdr;
3631 struct ieee80211_tx_data tx = {
3632 .local = sdata->local,
3635 struct sta_info *sta;
3639 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3641 skb = ERR_PTR(-EINVAL);
3645 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3649 hdr = (void *)skb->data;
3650 tx.sta = sta_info_get(sdata, hdr->addr1);
3653 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3656 return ERR_PTR(-EINVAL);
3665 * ieee80211_clear_tx_pending may not be called in a context where
3666 * it is possible that it packets could come in again.
3668 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3670 struct sk_buff *skb;
3673 for (i = 0; i < local->hw.queues; i++) {
3674 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3675 ieee80211_free_txskb(&local->hw, skb);
3680 * Returns false if the frame couldn't be transmitted but was queued instead,
3681 * which in this case means re-queued -- take as an indication to stop sending
3682 * more pending frames.
3684 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3685 struct sk_buff *skb)
3687 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3688 struct ieee80211_sub_if_data *sdata;
3689 struct sta_info *sta;
3690 struct ieee80211_hdr *hdr;
3692 struct ieee80211_chanctx_conf *chanctx_conf;
3694 sdata = vif_to_sdata(info->control.vif);
3696 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3697 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3698 if (unlikely(!chanctx_conf)) {
3702 info->band = chanctx_conf->def.chan->band;
3703 result = ieee80211_tx(sdata, NULL, skb, true);
3705 struct sk_buff_head skbs;
3707 __skb_queue_head_init(&skbs);
3708 __skb_queue_tail(&skbs, skb);
3710 hdr = (struct ieee80211_hdr *)skb->data;
3711 sta = sta_info_get(sdata, hdr->addr1);
3713 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3720 * Transmit all pending packets. Called from tasklet.
3722 void ieee80211_tx_pending(unsigned long data)
3724 struct ieee80211_local *local = (struct ieee80211_local *)data;
3725 unsigned long flags;
3731 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3732 for (i = 0; i < local->hw.queues; i++) {
3734 * If queue is stopped by something other than due to pending
3735 * frames, or we have no pending frames, proceed to next queue.
3737 if (local->queue_stop_reasons[i] ||
3738 skb_queue_empty(&local->pending[i]))
3741 while (!skb_queue_empty(&local->pending[i])) {
3742 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3743 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3745 if (WARN_ON(!info->control.vif)) {
3746 ieee80211_free_txskb(&local->hw, skb);
3750 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3753 txok = ieee80211_tx_pending_skb(local, skb);
3754 spin_lock_irqsave(&local->queue_stop_reason_lock,
3760 if (skb_queue_empty(&local->pending[i]))
3761 ieee80211_propagate_queue_wake(local, i);
3763 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3768 /* functions for drivers to get certain frames */
3770 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3771 struct ps_data *ps, struct sk_buff *skb,
3776 int i, have_bits = 0, n1, n2;
3778 /* Generate bitmap for TIM only if there are any STAs in power save
3780 if (atomic_read(&ps->num_sta_ps) > 0)
3781 /* in the hope that this is faster than
3782 * checking byte-for-byte */
3783 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3784 IEEE80211_MAX_AID+1);
3786 if (ps->dtim_count == 0)
3787 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3792 tim = pos = (u8 *) skb_put(skb, 6);
3793 *pos++ = WLAN_EID_TIM;
3795 *pos++ = ps->dtim_count;
3796 *pos++ = sdata->vif.bss_conf.dtim_period;
3798 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3801 ps->dtim_bc_mc = aid0 == 1;
3804 /* Find largest even number N1 so that bits numbered 1 through
3805 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3806 * (N2 + 1) x 8 through 2007 are 0. */
3808 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3815 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3822 /* Bitmap control */
3824 /* Part Virt Bitmap */
3825 skb_put(skb, n2 - n1);
3826 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3828 tim[1] = n2 - n1 + 4;
3830 *pos++ = aid0; /* Bitmap control */
3831 *pos++ = 0; /* Part Virt Bitmap */
3835 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3836 struct ps_data *ps, struct sk_buff *skb,
3839 struct ieee80211_local *local = sdata->local;
3842 * Not very nice, but we want to allow the driver to call
3843 * ieee80211_beacon_get() as a response to the set_tim()
3844 * callback. That, however, is already invoked under the
3845 * sta_lock to guarantee consistent and race-free update
3846 * of the tim bitmap in mac80211 and the driver.
3848 if (local->tim_in_locked_section) {
3849 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3851 spin_lock_bh(&local->tim_lock);
3852 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3853 spin_unlock_bh(&local->tim_lock);
3859 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3860 struct beacon_data *beacon)
3862 struct probe_resp *resp;
3864 size_t beacon_data_len;
3866 u8 count = beacon->csa_current_counter;
3868 switch (sdata->vif.type) {
3869 case NL80211_IFTYPE_AP:
3870 beacon_data = beacon->tail;
3871 beacon_data_len = beacon->tail_len;
3873 case NL80211_IFTYPE_ADHOC:
3874 beacon_data = beacon->head;
3875 beacon_data_len = beacon->head_len;
3877 case NL80211_IFTYPE_MESH_POINT:
3878 beacon_data = beacon->head;
3879 beacon_data_len = beacon->head_len;
3886 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3887 resp = rcu_dereference(sdata->u.ap.probe_resp);
3889 if (beacon->csa_counter_offsets[i]) {
3890 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3896 beacon_data[beacon->csa_counter_offsets[i]] = count;
3899 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3900 resp->data[resp->csa_counter_offsets[i]] = count;
3905 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3907 beacon->csa_current_counter--;
3909 /* the counter should never reach 0 */
3910 WARN_ON_ONCE(!beacon->csa_current_counter);
3912 return beacon->csa_current_counter;
3915 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3917 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3918 struct beacon_data *beacon = NULL;
3923 if (sdata->vif.type == NL80211_IFTYPE_AP)
3924 beacon = rcu_dereference(sdata->u.ap.beacon);
3925 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3926 beacon = rcu_dereference(sdata->u.ibss.presp);
3927 else if (ieee80211_vif_is_mesh(&sdata->vif))
3928 beacon = rcu_dereference(sdata->u.mesh.beacon);
3933 count = __ieee80211_csa_update_counter(beacon);
3939 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3941 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3943 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3944 struct beacon_data *beacon = NULL;
3946 size_t beacon_data_len;
3949 if (!ieee80211_sdata_running(sdata))
3953 if (vif->type == NL80211_IFTYPE_AP) {
3954 struct ieee80211_if_ap *ap = &sdata->u.ap;
3956 beacon = rcu_dereference(ap->beacon);
3957 if (WARN_ON(!beacon || !beacon->tail))
3959 beacon_data = beacon->tail;
3960 beacon_data_len = beacon->tail_len;
3961 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3962 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3964 beacon = rcu_dereference(ifibss->presp);
3968 beacon_data = beacon->head;
3969 beacon_data_len = beacon->head_len;
3970 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3971 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3973 beacon = rcu_dereference(ifmsh->beacon);
3977 beacon_data = beacon->head;
3978 beacon_data_len = beacon->head_len;
3984 if (!beacon->csa_counter_offsets[0])
3987 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3990 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3997 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3999 static struct sk_buff *
4000 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4001 struct ieee80211_vif *vif,
4002 struct ieee80211_mutable_offsets *offs,
4005 struct ieee80211_local *local = hw_to_local(hw);
4006 struct beacon_data *beacon = NULL;
4007 struct sk_buff *skb = NULL;
4008 struct ieee80211_tx_info *info;
4009 struct ieee80211_sub_if_data *sdata = NULL;
4010 enum nl80211_band band;
4011 struct ieee80211_tx_rate_control txrc;
4012 struct ieee80211_chanctx_conf *chanctx_conf;
4013 int csa_off_base = 0;
4017 sdata = vif_to_sdata(vif);
4018 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4020 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4024 memset(offs, 0, sizeof(*offs));
4026 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4027 struct ieee80211_if_ap *ap = &sdata->u.ap;
4029 beacon = rcu_dereference(ap->beacon);
4031 if (beacon->csa_counter_offsets[0]) {
4033 __ieee80211_csa_update_counter(beacon);
4035 ieee80211_set_csa(sdata, beacon);
4039 * headroom, head length,
4040 * tail length and maximum TIM length
4042 skb = dev_alloc_skb(local->tx_headroom +
4044 beacon->tail_len + 256 +
4045 local->hw.extra_beacon_tailroom);
4049 skb_reserve(skb, local->tx_headroom);
4050 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4053 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4057 offs->tim_offset = beacon->head_len;
4058 offs->tim_length = skb->len - beacon->head_len;
4060 /* for AP the csa offsets are from tail */
4061 csa_off_base = skb->len;
4065 memcpy(skb_put(skb, beacon->tail_len),
4066 beacon->tail, beacon->tail_len);
4069 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4070 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4071 struct ieee80211_hdr *hdr;
4073 beacon = rcu_dereference(ifibss->presp);
4077 if (beacon->csa_counter_offsets[0]) {
4079 __ieee80211_csa_update_counter(beacon);
4081 ieee80211_set_csa(sdata, beacon);
4084 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4085 local->hw.extra_beacon_tailroom);
4088 skb_reserve(skb, local->tx_headroom);
4089 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4092 hdr = (struct ieee80211_hdr *) skb->data;
4093 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4094 IEEE80211_STYPE_BEACON);
4095 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4096 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4098 beacon = rcu_dereference(ifmsh->beacon);
4102 if (beacon->csa_counter_offsets[0]) {
4104 /* TODO: For mesh csa_counter is in TU, so
4105 * decrementing it by one isn't correct, but
4106 * for now we leave it consistent with overall
4107 * mac80211's behavior.
4109 __ieee80211_csa_update_counter(beacon);
4111 ieee80211_set_csa(sdata, beacon);
4114 if (ifmsh->sync_ops)
4115 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
4117 skb = dev_alloc_skb(local->tx_headroom +
4121 local->hw.extra_beacon_tailroom);
4124 skb_reserve(skb, local->tx_headroom);
4125 memcpy(skb_put(skb, beacon->head_len), beacon->head,
4127 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4130 offs->tim_offset = beacon->head_len;
4131 offs->tim_length = skb->len - beacon->head_len;
4134 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
4142 if (offs && beacon) {
4145 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4146 u16 csa_off = beacon->csa_counter_offsets[i];
4151 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4155 band = chanctx_conf->def.chan->band;
4157 info = IEEE80211_SKB_CB(skb);
4159 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4160 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4163 memset(&txrc, 0, sizeof(txrc));
4165 txrc.sband = local->hw.wiphy->bands[band];
4166 txrc.bss_conf = &sdata->vif.bss_conf;
4168 txrc.reported_rate.idx = -1;
4169 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4170 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
4171 txrc.max_rate_idx = -1;
4173 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
4175 rate_control_get_rate(sdata, NULL, &txrc);
4177 info->control.vif = vif;
4179 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4180 IEEE80211_TX_CTL_ASSIGN_SEQ |
4181 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4189 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4190 struct ieee80211_vif *vif,
4191 struct ieee80211_mutable_offsets *offs)
4193 return __ieee80211_beacon_get(hw, vif, offs, true);
4195 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4197 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4198 struct ieee80211_vif *vif,
4199 u16 *tim_offset, u16 *tim_length)
4201 struct ieee80211_mutable_offsets offs = {};
4202 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4203 struct sk_buff *copy;
4204 struct ieee80211_supported_band *sband;
4211 *tim_offset = offs.tim_offset;
4214 *tim_length = offs.tim_length;
4216 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4217 !hw_to_local(hw)->monitors)
4220 /* send a copy to monitor interfaces */
4221 copy = skb_copy(bcn, GFP_ATOMIC);
4225 shift = ieee80211_vif_get_shift(vif);
4226 sband = ieee80211_get_sband(vif_to_sdata(vif));
4230 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4234 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4236 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4237 struct ieee80211_vif *vif)
4239 struct ieee80211_if_ap *ap = NULL;
4240 struct sk_buff *skb = NULL;
4241 struct probe_resp *presp = NULL;
4242 struct ieee80211_hdr *hdr;
4243 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4245 if (sdata->vif.type != NL80211_IFTYPE_AP)
4251 presp = rcu_dereference(ap->probe_resp);
4255 skb = dev_alloc_skb(presp->len);
4259 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
4261 hdr = (struct ieee80211_hdr *) skb->data;
4262 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4268 EXPORT_SYMBOL(ieee80211_proberesp_get);
4270 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4271 struct ieee80211_vif *vif)
4273 struct ieee80211_sub_if_data *sdata;
4274 struct ieee80211_if_managed *ifmgd;
4275 struct ieee80211_pspoll *pspoll;
4276 struct ieee80211_local *local;
4277 struct sk_buff *skb;
4279 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4282 sdata = vif_to_sdata(vif);
4283 ifmgd = &sdata->u.mgd;
4284 local = sdata->local;
4286 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4290 skb_reserve(skb, local->hw.extra_tx_headroom);
4292 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
4293 memset(pspoll, 0, sizeof(*pspoll));
4294 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4295 IEEE80211_STYPE_PSPOLL);
4296 pspoll->aid = cpu_to_le16(ifmgd->aid);
4298 /* aid in PS-Poll has its two MSBs each set to 1 */
4299 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4301 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4302 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4306 EXPORT_SYMBOL(ieee80211_pspoll_get);
4308 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4309 struct ieee80211_vif *vif)
4311 struct ieee80211_hdr_3addr *nullfunc;
4312 struct ieee80211_sub_if_data *sdata;
4313 struct ieee80211_if_managed *ifmgd;
4314 struct ieee80211_local *local;
4315 struct sk_buff *skb;
4317 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4320 sdata = vif_to_sdata(vif);
4321 ifmgd = &sdata->u.mgd;
4322 local = sdata->local;
4324 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
4328 skb_reserve(skb, local->hw.extra_tx_headroom);
4330 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
4332 memset(nullfunc, 0, sizeof(*nullfunc));
4333 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4334 IEEE80211_STYPE_NULLFUNC |
4335 IEEE80211_FCTL_TODS);
4336 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4337 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4338 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4342 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4344 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4346 const u8 *ssid, size_t ssid_len,
4349 struct ieee80211_local *local = hw_to_local(hw);
4350 struct ieee80211_hdr_3addr *hdr;
4351 struct sk_buff *skb;
4355 ie_ssid_len = 2 + ssid_len;
4357 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4358 ie_ssid_len + tailroom);
4362 skb_reserve(skb, local->hw.extra_tx_headroom);
4364 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
4365 memset(hdr, 0, sizeof(*hdr));
4366 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4367 IEEE80211_STYPE_PROBE_REQ);
4368 eth_broadcast_addr(hdr->addr1);
4369 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4370 eth_broadcast_addr(hdr->addr3);
4372 pos = skb_put(skb, ie_ssid_len);
4373 *pos++ = WLAN_EID_SSID;
4376 memcpy(pos, ssid, ssid_len);
4381 EXPORT_SYMBOL(ieee80211_probereq_get);
4383 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4384 const void *frame, size_t frame_len,
4385 const struct ieee80211_tx_info *frame_txctl,
4386 struct ieee80211_rts *rts)
4388 const struct ieee80211_hdr *hdr = frame;
4390 rts->frame_control =
4391 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4392 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4394 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4395 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4397 EXPORT_SYMBOL(ieee80211_rts_get);
4399 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4400 const void *frame, size_t frame_len,
4401 const struct ieee80211_tx_info *frame_txctl,
4402 struct ieee80211_cts *cts)
4404 const struct ieee80211_hdr *hdr = frame;
4406 cts->frame_control =
4407 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4408 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4409 frame_len, frame_txctl);
4410 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4412 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4415 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4416 struct ieee80211_vif *vif)
4418 struct ieee80211_local *local = hw_to_local(hw);
4419 struct sk_buff *skb = NULL;
4420 struct ieee80211_tx_data tx;
4421 struct ieee80211_sub_if_data *sdata;
4423 struct ieee80211_tx_info *info;
4424 struct ieee80211_chanctx_conf *chanctx_conf;
4426 sdata = vif_to_sdata(vif);
4429 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4434 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4435 struct beacon_data *beacon =
4436 rcu_dereference(sdata->u.ap.beacon);
4438 if (!beacon || !beacon->head)
4441 ps = &sdata->u.ap.ps;
4442 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4443 ps = &sdata->u.mesh.ps;
4448 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4449 goto out; /* send buffered bc/mc only after DTIM beacon */
4452 skb = skb_dequeue(&ps->bc_buf);
4455 local->total_ps_buffered--;
4457 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4458 struct ieee80211_hdr *hdr =
4459 (struct ieee80211_hdr *) skb->data;
4460 /* more buffered multicast/broadcast frames ==> set
4461 * MoreData flag in IEEE 802.11 header to inform PS
4463 hdr->frame_control |=
4464 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4467 if (sdata->vif.type == NL80211_IFTYPE_AP)
4468 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4469 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4471 ieee80211_free_txskb(hw, skb);
4474 info = IEEE80211_SKB_CB(skb);
4476 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4477 info->band = chanctx_conf->def.chan->band;
4479 if (invoke_tx_handlers(&tx))
4486 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4488 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4490 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4491 struct ieee80211_sub_if_data *sdata = sta->sdata;
4492 struct ieee80211_local *local = sdata->local;
4496 lockdep_assert_held(&local->sta_mtx);
4498 /* only some cases are supported right now */
4499 switch (sdata->vif.type) {
4500 case NL80211_IFTYPE_STATION:
4501 case NL80211_IFTYPE_AP:
4502 case NL80211_IFTYPE_AP_VLAN:
4509 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4512 if (sta->reserved_tid == tid) {
4517 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4518 sdata_err(sdata, "TID reservation already active\n");
4523 ieee80211_stop_vif_queues(sdata->local, sdata,
4524 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4528 /* Tear down BA sessions so we stop aggregating on this TID */
4529 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4530 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4531 __ieee80211_stop_tx_ba_session(sta, tid,
4532 AGG_STOP_LOCAL_REQUEST);
4535 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4536 __ieee80211_flush_queues(local, sdata, queues, false);
4538 sta->reserved_tid = tid;
4540 ieee80211_wake_vif_queues(local, sdata,
4541 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4543 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4544 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4550 EXPORT_SYMBOL(ieee80211_reserve_tid);
4552 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4554 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4555 struct ieee80211_sub_if_data *sdata = sta->sdata;
4557 lockdep_assert_held(&sdata->local->sta_mtx);
4559 /* only some cases are supported right now */
4560 switch (sdata->vif.type) {
4561 case NL80211_IFTYPE_STATION:
4562 case NL80211_IFTYPE_AP:
4563 case NL80211_IFTYPE_AP_VLAN:
4570 if (tid != sta->reserved_tid) {
4571 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4575 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4577 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4579 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4580 struct sk_buff *skb, int tid,
4581 enum nl80211_band band)
4583 int ac = ieee802_1d_to_ac[tid & 7];
4585 skb_reset_mac_header(skb);
4586 skb_set_queue_mapping(skb, ac);
4587 skb->priority = tid;
4589 skb->dev = sdata->dev;
4592 * The other path calling ieee80211_xmit is from the tasklet,
4593 * and while we can handle concurrent transmissions locking
4594 * requirements are that we do not come into tx with bhs on.
4597 IEEE80211_SKB_CB(skb)->band = band;
4598 ieee80211_xmit(sdata, NULL, skb);