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
7 * Copyright (C) 2018 Intel Corporation
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 * Transmit and frame generation functions.
17 #include <linux/kernel.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/if_vlan.h>
21 #include <linux/etherdevice.h>
22 #include <linux/bitmap.h>
23 #include <linux/rcupdate.h>
24 #include <linux/export.h>
25 #include <net/net_namespace.h>
26 #include <net/ieee80211_radiotap.h>
27 #include <net/cfg80211.h>
28 #include <net/mac80211.h>
29 #include <net/codel.h>
30 #include <net/codel_impl.h>
31 #include <asm/unaligned.h>
32 #include <net/fq_impl.h>
34 #include "ieee80211_i.h"
35 #include "driver-ops.h"
45 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
47 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
49 u64_stats_update_begin(&tstats->syncp);
51 tstats->tx_bytes += len;
52 u64_stats_update_end(&tstats->syncp);
55 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
56 struct sk_buff *skb, int group_addr,
59 int rate, mrate, erp, dur, i, shift = 0;
60 struct ieee80211_rate *txrate;
61 struct ieee80211_local *local = tx->local;
62 struct ieee80211_supported_band *sband;
63 struct ieee80211_hdr *hdr;
64 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
65 struct ieee80211_chanctx_conf *chanctx_conf;
68 /* assume HW handles this */
69 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
73 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
75 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
76 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
81 if (WARN_ON_ONCE(tx->rate.idx < 0))
84 sband = local->hw.wiphy->bands[info->band];
85 txrate = &sband->bitrates[tx->rate.idx];
87 erp = txrate->flags & IEEE80211_RATE_ERP_G;
90 * data and mgmt (except PS Poll):
92 * - during contention period:
93 * if addr1 is group address: 0
94 * if more fragments = 0 and addr1 is individual address: time to
95 * transmit one ACK plus SIFS
96 * if more fragments = 1 and addr1 is individual address: time to
97 * transmit next fragment plus 2 x ACK plus 3 x SIFS
100 * - control response frame (CTS or ACK) shall be transmitted using the
101 * same rate as the immediately previous frame in the frame exchange
102 * sequence, if this rate belongs to the PHY mandatory rates, or else
103 * at the highest possible rate belonging to the PHY rates in the
106 hdr = (struct ieee80211_hdr *)skb->data;
107 if (ieee80211_is_ctl(hdr->frame_control)) {
108 /* TODO: These control frames are not currently sent by
109 * mac80211, but should they be implemented, this function
110 * needs to be updated to support duration field calculation.
112 * RTS: time needed to transmit pending data/mgmt frame plus
113 * one CTS frame plus one ACK frame plus 3 x SIFS
114 * CTS: duration of immediately previous RTS minus time
115 * required to transmit CTS and its SIFS
116 * ACK: 0 if immediately previous directed data/mgmt had
117 * more=0, with more=1 duration in ACK frame is duration
118 * from previous frame minus time needed to transmit ACK
120 * PS Poll: BIT(15) | BIT(14) | aid
126 if (0 /* FIX: data/mgmt during CFP */)
127 return cpu_to_le16(32768);
129 if (group_addr) /* Group address as the destination - no ACK */
132 /* Individual destination address:
133 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
134 * CTS and ACK frames shall be transmitted using the highest rate in
135 * basic rate set that is less than or equal to the rate of the
136 * immediately previous frame and that is using the same modulation
137 * (CCK or OFDM). If no basic rate set matches with these requirements,
138 * the highest mandatory rate of the PHY that is less than or equal to
139 * the rate of the previous frame is used.
140 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
143 /* use lowest available if everything fails */
144 mrate = sband->bitrates[0].bitrate;
145 for (i = 0; i < sband->n_bitrates; i++) {
146 struct ieee80211_rate *r = &sband->bitrates[i];
148 if (r->bitrate > txrate->bitrate)
151 if ((rate_flags & r->flags) != rate_flags)
154 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
155 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
157 switch (sband->band) {
158 case NL80211_BAND_2GHZ: {
160 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
161 flag = IEEE80211_RATE_MANDATORY_G;
163 flag = IEEE80211_RATE_MANDATORY_B;
168 case NL80211_BAND_5GHZ:
169 if (r->flags & IEEE80211_RATE_MANDATORY_A)
172 case NL80211_BAND_60GHZ:
173 /* TODO, for now fall through */
174 case NUM_NL80211_BANDS:
180 /* No matching basic rate found; use highest suitable mandatory
182 rate = DIV_ROUND_UP(mrate, 1 << shift);
185 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
186 if (ieee80211_is_data_qos(hdr->frame_control) &&
187 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
190 /* Time needed to transmit ACK
191 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
192 * to closest integer */
193 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
194 tx->sdata->vif.bss_conf.use_short_preamble,
198 /* Frame is fragmented: duration increases with time needed to
199 * transmit next fragment plus ACK and 2 x SIFS. */
200 dur *= 2; /* ACK + SIFS */
202 dur += ieee80211_frame_duration(sband->band, next_frag_len,
203 txrate->bitrate, erp,
204 tx->sdata->vif.bss_conf.use_short_preamble,
208 return cpu_to_le16(dur);
212 static ieee80211_tx_result debug_noinline
213 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
215 struct ieee80211_local *local = tx->local;
216 struct ieee80211_if_managed *ifmgd;
218 /* driver doesn't support power save */
219 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
222 /* hardware does dynamic power save */
223 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
226 /* dynamic power save disabled */
227 if (local->hw.conf.dynamic_ps_timeout <= 0)
230 /* we are scanning, don't enable power save */
234 if (!local->ps_sdata)
237 /* No point if we're going to suspend */
238 if (local->quiescing)
241 /* dynamic ps is supported only in managed mode */
242 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
245 ifmgd = &tx->sdata->u.mgd;
248 * Don't wakeup from power save if u-apsd is enabled, voip ac has
249 * u-apsd enabled and the frame is in voip class. This effectively
250 * means that even if all access categories have u-apsd enabled, in
251 * practise u-apsd is only used with the voip ac. This is a
252 * workaround for the case when received voip class packets do not
253 * have correct qos tag for some reason, due the network or the
256 * Note: ifmgd->uapsd_queues access is racy here. If the value is
257 * changed via debugfs, user needs to reassociate manually to have
258 * everything in sync.
260 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
261 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
262 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
265 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
266 ieee80211_stop_queues_by_reason(&local->hw,
267 IEEE80211_MAX_QUEUE_MAP,
268 IEEE80211_QUEUE_STOP_REASON_PS,
270 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
271 ieee80211_queue_work(&local->hw,
272 &local->dynamic_ps_disable_work);
275 /* Don't restart the timer if we're not disassociated */
276 if (!ifmgd->associated)
279 mod_timer(&local->dynamic_ps_timer, jiffies +
280 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
285 static ieee80211_tx_result debug_noinline
286 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
289 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
290 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
293 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
296 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
297 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
298 !ieee80211_is_probe_req(hdr->frame_control) &&
299 !ieee80211_is_nullfunc(hdr->frame_control))
301 * When software scanning only nullfunc frames (to notify
302 * the sleep state to the AP) and probe requests (for the
303 * active scan) are allowed, all other frames should not be
304 * sent and we should not get here, but if we do
305 * nonetheless, drop them to avoid sending them
306 * off-channel. See the link below and
307 * ieee80211_start_scan() for more.
309 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
313 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
316 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
319 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
323 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
325 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
326 if (unlikely(!assoc &&
327 ieee80211_is_data(hdr->frame_control))) {
328 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
329 sdata_info(tx->sdata,
330 "dropped data frame to not associated station %pM\n",
333 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
336 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
337 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
339 * No associated STAs - no need to send multicast
348 /* This function is called whenever the AP is about to exceed the maximum limit
349 * of buffered frames for power saving STAs. This situation should not really
350 * happen often during normal operation, so dropping the oldest buffered packet
351 * from each queue should be OK to make some room for new frames. */
352 static void purge_old_ps_buffers(struct ieee80211_local *local)
354 int total = 0, purged = 0;
356 struct ieee80211_sub_if_data *sdata;
357 struct sta_info *sta;
359 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
362 if (sdata->vif.type == NL80211_IFTYPE_AP)
363 ps = &sdata->u.ap.ps;
364 else if (ieee80211_vif_is_mesh(&sdata->vif))
365 ps = &sdata->u.mesh.ps;
369 skb = skb_dequeue(&ps->bc_buf);
372 ieee80211_free_txskb(&local->hw, skb);
374 total += skb_queue_len(&ps->bc_buf);
378 * Drop one frame from each station from the lowest-priority
379 * AC that has frames at all.
381 list_for_each_entry_rcu(sta, &local->sta_list, list) {
384 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
385 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
386 total += skb_queue_len(&sta->ps_tx_buf[ac]);
389 ieee80211_free_txskb(&local->hw, skb);
395 local->total_ps_buffered = total;
396 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
399 static ieee80211_tx_result
400 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
402 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
403 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
407 * broadcast/multicast frame
409 * If any of the associated/peer stations is in power save mode,
410 * the frame is buffered to be sent after DTIM beacon frame.
411 * This is done either by the hardware or us.
414 /* powersaving STAs currently only in AP/VLAN/mesh mode */
415 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
416 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
420 ps = &tx->sdata->bss->ps;
421 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
422 ps = &tx->sdata->u.mesh.ps;
428 /* no buffering for ordered frames */
429 if (ieee80211_has_order(hdr->frame_control))
432 if (ieee80211_is_probe_req(hdr->frame_control))
435 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
436 info->hw_queue = tx->sdata->vif.cab_queue;
438 /* no stations in PS mode */
439 if (!atomic_read(&ps->num_sta_ps))
442 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
444 /* device releases frame after DTIM beacon */
445 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
448 /* buffered in mac80211 */
449 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
450 purge_old_ps_buffers(tx->local);
452 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
454 "BC TX buffer full - dropping the oldest frame\n");
455 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
457 tx->local->total_ps_buffered++;
459 skb_queue_tail(&ps->bc_buf, tx->skb);
464 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
467 if (!ieee80211_is_mgmt(fc))
470 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
473 if (!ieee80211_is_robust_mgmt_frame(skb))
479 static ieee80211_tx_result
480 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
482 struct sta_info *sta = tx->sta;
483 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
484 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
485 struct ieee80211_local *local = tx->local;
490 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
491 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
492 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
493 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
494 int ac = skb_get_queue_mapping(tx->skb);
496 if (ieee80211_is_mgmt(hdr->frame_control) &&
497 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
498 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
502 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
503 sta->sta.addr, sta->sta.aid, ac);
504 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
505 purge_old_ps_buffers(tx->local);
507 /* sync with ieee80211_sta_ps_deliver_wakeup */
508 spin_lock(&sta->ps_lock);
510 * STA woke up the meantime and all the frames on ps_tx_buf have
511 * been queued to pending queue. No reordering can happen, go
512 * ahead and Tx the packet.
514 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
515 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
516 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
517 spin_unlock(&sta->ps_lock);
521 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
522 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
524 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
526 ieee80211_free_txskb(&local->hw, old);
528 tx->local->total_ps_buffered++;
530 info->control.jiffies = jiffies;
531 info->control.vif = &tx->sdata->vif;
532 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
533 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
534 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
535 spin_unlock(&sta->ps_lock);
537 if (!timer_pending(&local->sta_cleanup))
538 mod_timer(&local->sta_cleanup,
539 round_jiffies(jiffies +
540 STA_INFO_CLEANUP_INTERVAL));
543 * We queued up some frames, so the TIM bit might
544 * need to be set, recalculate it.
546 sta_info_recalc_tim(sta);
549 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
551 "STA %pM in PS mode, but polling/in SP -> send frame\n",
558 static ieee80211_tx_result debug_noinline
559 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
561 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
564 if (tx->flags & IEEE80211_TX_UNICAST)
565 return ieee80211_tx_h_unicast_ps_buf(tx);
567 return ieee80211_tx_h_multicast_ps_buf(tx);
570 static ieee80211_tx_result debug_noinline
571 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
573 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
575 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
576 if (tx->sdata->control_port_no_encrypt)
577 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
578 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
579 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
585 static ieee80211_tx_result debug_noinline
586 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
588 struct ieee80211_key *key;
589 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
590 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
592 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
595 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
597 else if (ieee80211_is_group_privacy_action(tx->skb) &&
598 (key = rcu_dereference(tx->sdata->default_multicast_key)))
600 else if (ieee80211_is_mgmt(hdr->frame_control) &&
601 is_multicast_ether_addr(hdr->addr1) &&
602 ieee80211_is_robust_mgmt_frame(tx->skb) &&
603 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
605 else if (is_multicast_ether_addr(hdr->addr1) &&
606 (key = rcu_dereference(tx->sdata->default_multicast_key)))
608 else if (!is_multicast_ether_addr(hdr->addr1) &&
609 (key = rcu_dereference(tx->sdata->default_unicast_key)))
615 bool skip_hw = false;
617 /* TODO: add threshold stuff again */
619 switch (tx->key->conf.cipher) {
620 case WLAN_CIPHER_SUITE_WEP40:
621 case WLAN_CIPHER_SUITE_WEP104:
622 case WLAN_CIPHER_SUITE_TKIP:
623 if (!ieee80211_is_data_present(hdr->frame_control))
626 case WLAN_CIPHER_SUITE_CCMP:
627 case WLAN_CIPHER_SUITE_CCMP_256:
628 case WLAN_CIPHER_SUITE_GCMP:
629 case WLAN_CIPHER_SUITE_GCMP_256:
630 if (!ieee80211_is_data_present(hdr->frame_control) &&
631 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
633 !ieee80211_is_group_privacy_action(tx->skb))
636 skip_hw = (tx->key->conf.flags &
637 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
638 ieee80211_is_mgmt(hdr->frame_control);
640 case WLAN_CIPHER_SUITE_AES_CMAC:
641 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
643 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
644 if (!ieee80211_is_mgmt(hdr->frame_control))
649 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
650 !ieee80211_is_deauth(hdr->frame_control)))
653 if (!skip_hw && tx->key &&
654 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
655 info->control.hw_key = &tx->key->conf;
661 static ieee80211_tx_result debug_noinline
662 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
665 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
666 struct ieee80211_supported_band *sband;
668 struct ieee80211_tx_rate_control txrc;
669 struct ieee80211_sta_rates *ratetbl = NULL;
672 memset(&txrc, 0, sizeof(txrc));
674 sband = tx->local->hw.wiphy->bands[info->band];
676 len = min_t(u32, tx->skb->len + FCS_LEN,
677 tx->local->hw.wiphy->frag_threshold);
679 /* set up the tx rate control struct we give the RC algo */
680 txrc.hw = &tx->local->hw;
682 txrc.bss_conf = &tx->sdata->vif.bss_conf;
684 txrc.reported_rate.idx = -1;
685 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
687 if (tx->sdata->rc_has_mcs_mask[info->band])
688 txrc.rate_idx_mcs_mask =
689 tx->sdata->rc_rateidx_mcs_mask[info->band];
691 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
692 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
693 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
694 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
696 /* set up RTS protection if desired */
697 if (len > tx->local->hw.wiphy->rts_threshold) {
701 info->control.use_rts = txrc.rts;
702 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
705 * Use short preamble if the BSS can handle it, but not for
706 * management frames unless we know the receiver can handle
707 * that -- the management frame might be to a station that
708 * just wants a probe response.
710 if (tx->sdata->vif.bss_conf.use_short_preamble &&
711 (ieee80211_is_data(hdr->frame_control) ||
712 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
713 txrc.short_preamble = true;
715 info->control.short_preamble = txrc.short_preamble;
717 /* don't ask rate control when rate already injected via radiotap */
718 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
722 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
725 * Lets not bother rate control if we're associated and cannot
726 * talk to the sta. This should not happen.
728 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
729 !rate_usable_index_exists(sband, &tx->sta->sta),
730 "%s: Dropped data frame as no usable bitrate found while "
731 "scanning and associated. Target station: "
732 "%pM on %d GHz band\n",
733 tx->sdata->name, hdr->addr1,
738 * If we're associated with the sta at this point we know we can at
739 * least send the frame at the lowest bit rate.
741 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
743 if (tx->sta && !info->control.skip_table)
744 ratetbl = rcu_dereference(tx->sta->sta.rates);
746 if (unlikely(info->control.rates[0].idx < 0)) {
748 struct ieee80211_tx_rate rate = {
749 .idx = ratetbl->rate[0].idx,
750 .flags = ratetbl->rate[0].flags,
751 .count = ratetbl->rate[0].count
754 if (ratetbl->rate[0].idx < 0)
762 tx->rate = info->control.rates[0];
765 if (txrc.reported_rate.idx < 0) {
766 txrc.reported_rate = tx->rate;
767 if (tx->sta && ieee80211_is_data(hdr->frame_control))
768 tx->sta->tx_stats.last_rate = txrc.reported_rate;
770 tx->sta->tx_stats.last_rate = txrc.reported_rate;
775 if (unlikely(!info->control.rates[0].count))
776 info->control.rates[0].count = 1;
778 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
779 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
780 info->control.rates[0].count = 1;
785 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
787 u16 *seq = &sta->tid_seq[tid];
788 __le16 ret = cpu_to_le16(*seq);
790 /* Increase the sequence number. */
791 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
796 static ieee80211_tx_result debug_noinline
797 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
799 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
800 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
804 * Packet injection may want to control the sequence
805 * number, if we have no matching interface then we
806 * neither assign one ourselves nor ask the driver to.
808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
811 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
814 if (ieee80211_hdrlen(hdr->frame_control) < 24)
817 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
821 * Anything but QoS data that has a sequence number field
822 * (is long enough) gets a sequence number from the global
823 * counter. QoS data frames with a multicast destination
824 * also use the global counter (802.11-2012 9.3.2.10).
826 if (!ieee80211_is_data_qos(hdr->frame_control) ||
827 is_multicast_ether_addr(hdr->addr1)) {
828 /* driver should assign sequence number */
829 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
830 /* for pure STA mode without beacons, we can do it */
831 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
832 tx->sdata->sequence_number += 0x10;
834 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
839 * This should be true for injected/management frames only, for
840 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
841 * above since they are not QoS-data frames.
846 /* include per-STA, per-TID sequence counter */
847 tid = ieee80211_get_tid(hdr);
848 tx->sta->tx_stats.msdu[tid]++;
850 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
855 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
856 struct sk_buff *skb, int hdrlen,
859 struct ieee80211_local *local = tx->local;
860 struct ieee80211_tx_info *info;
862 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
863 int pos = hdrlen + per_fragm;
864 int rem = skb->len - hdrlen - per_fragm;
866 if (WARN_ON(rem < 0))
869 /* first fragment was already added to queue by caller */
872 int fraglen = per_fragm;
877 tmp = dev_alloc_skb(local->tx_headroom +
879 tx->sdata->encrypt_headroom +
880 IEEE80211_ENCRYPT_TAILROOM);
884 __skb_queue_tail(&tx->skbs, tmp);
887 local->tx_headroom + tx->sdata->encrypt_headroom);
889 /* copy control information */
890 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
892 info = IEEE80211_SKB_CB(tmp);
893 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
894 IEEE80211_TX_CTL_FIRST_FRAGMENT);
897 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
899 skb_copy_queue_mapping(tmp, skb);
900 tmp->priority = skb->priority;
903 /* copy header and data */
904 skb_put_data(tmp, skb->data, hdrlen);
905 skb_put_data(tmp, skb->data + pos, fraglen);
910 /* adjust first fragment's length */
911 skb_trim(skb, hdrlen + per_fragm);
915 static ieee80211_tx_result debug_noinline
916 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
918 struct sk_buff *skb = tx->skb;
919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
920 struct ieee80211_hdr *hdr = (void *)skb->data;
921 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
925 /* no matter what happens, tx->skb moves to tx->skbs */
926 __skb_queue_tail(&tx->skbs, skb);
929 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
932 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
936 * Warn when submitting a fragmented A-MPDU frame and drop it.
937 * This scenario is handled in ieee80211_tx_prepare but extra
938 * caution taken here as fragmented ampdu may cause Tx stop.
940 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
943 hdrlen = ieee80211_hdrlen(hdr->frame_control);
945 /* internal error, why isn't DONTFRAG set? */
946 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
950 * Now fragment the frame. This will allocate all the fragments and
951 * chain them (using skb as the first fragment) to skb->next.
952 * During transmission, we will remove the successfully transmitted
953 * fragments from this list. When the low-level driver rejects one
954 * of the fragments then we will simply pretend to accept the skb
955 * but store it away as pending.
957 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
960 /* update duration/seq/flags of fragments */
963 skb_queue_walk(&tx->skbs, skb) {
964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
966 hdr = (void *)skb->data;
967 info = IEEE80211_SKB_CB(skb);
969 if (!skb_queue_is_last(&tx->skbs, skb)) {
970 hdr->frame_control |= morefrags;
972 * No multi-rate retries for fragmented frames, that
973 * would completely throw off the NAV at other STAs.
975 info->control.rates[1].idx = -1;
976 info->control.rates[2].idx = -1;
977 info->control.rates[3].idx = -1;
978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
981 hdr->frame_control &= ~morefrags;
983 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
990 static ieee80211_tx_result debug_noinline
991 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
999 skb_queue_walk(&tx->skbs, skb) {
1000 ac = skb_get_queue_mapping(skb);
1001 tx->sta->tx_stats.bytes[ac] += skb->len;
1004 tx->sta->tx_stats.packets[ac]++;
1009 static ieee80211_tx_result debug_noinline
1010 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1015 switch (tx->key->conf.cipher) {
1016 case WLAN_CIPHER_SUITE_WEP40:
1017 case WLAN_CIPHER_SUITE_WEP104:
1018 return ieee80211_crypto_wep_encrypt(tx);
1019 case WLAN_CIPHER_SUITE_TKIP:
1020 return ieee80211_crypto_tkip_encrypt(tx);
1021 case WLAN_CIPHER_SUITE_CCMP:
1022 return ieee80211_crypto_ccmp_encrypt(
1023 tx, IEEE80211_CCMP_MIC_LEN);
1024 case WLAN_CIPHER_SUITE_CCMP_256:
1025 return ieee80211_crypto_ccmp_encrypt(
1026 tx, IEEE80211_CCMP_256_MIC_LEN);
1027 case WLAN_CIPHER_SUITE_AES_CMAC:
1028 return ieee80211_crypto_aes_cmac_encrypt(tx);
1029 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1030 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1031 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1032 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1033 return ieee80211_crypto_aes_gmac_encrypt(tx);
1034 case WLAN_CIPHER_SUITE_GCMP:
1035 case WLAN_CIPHER_SUITE_GCMP_256:
1036 return ieee80211_crypto_gcmp_encrypt(tx);
1038 return ieee80211_crypto_hw_encrypt(tx);
1044 static ieee80211_tx_result debug_noinline
1045 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1047 struct sk_buff *skb;
1048 struct ieee80211_hdr *hdr;
1052 skb_queue_walk(&tx->skbs, skb) {
1053 hdr = (void *) skb->data;
1054 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1055 break; /* must not overwrite AID */
1056 if (!skb_queue_is_last(&tx->skbs, skb)) {
1057 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1058 next_len = next->len;
1061 group_addr = is_multicast_ether_addr(hdr->addr1);
1064 ieee80211_duration(tx, skb, group_addr, next_len);
1070 /* actual transmit path */
1072 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1073 struct sk_buff *skb,
1074 struct ieee80211_tx_info *info,
1075 struct tid_ampdu_tx *tid_tx,
1078 bool queued = false;
1079 bool reset_agg_timer = false;
1080 struct sk_buff *purge_skb = NULL;
1082 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1083 info->flags |= IEEE80211_TX_CTL_AMPDU;
1084 reset_agg_timer = true;
1085 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1087 * nothing -- this aggregation session is being started
1088 * but that might still fail with the driver
1090 } else if (!tx->sta->sta.txq[tid]) {
1091 spin_lock(&tx->sta->lock);
1093 * Need to re-check now, because we may get here
1095 * 1) in the window during which the setup is actually
1096 * already done, but not marked yet because not all
1097 * packets are spliced over to the driver pending
1098 * queue yet -- if this happened we acquire the lock
1099 * either before or after the splice happens, but
1100 * need to recheck which of these cases happened.
1102 * 2) during session teardown, if the OPERATIONAL bit
1103 * was cleared due to the teardown but the pointer
1104 * hasn't been assigned NULL yet (or we loaded it
1105 * before it was assigned) -- in this case it may
1106 * now be NULL which means we should just let the
1107 * packet pass through because splicing the frames
1108 * back is already done.
1110 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1113 /* do nothing, let packet pass through */
1114 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1115 info->flags |= IEEE80211_TX_CTL_AMPDU;
1116 reset_agg_timer = true;
1119 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1120 clear_sta_flag(tx->sta, WLAN_STA_SP);
1121 ps_dbg(tx->sta->sdata,
1122 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1123 tx->sta->sta.addr, tx->sta->sta.aid);
1125 info->control.vif = &tx->sdata->vif;
1126 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1127 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1128 __skb_queue_tail(&tid_tx->pending, skb);
1129 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1130 purge_skb = __skb_dequeue(&tid_tx->pending);
1132 spin_unlock(&tx->sta->lock);
1135 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1138 /* reset session timer */
1139 if (reset_agg_timer)
1140 tid_tx->last_tx = jiffies;
1147 * pass %NULL for the station if unknown, a valid pointer if known
1148 * or an ERR_PTR() if the station is known not to exist
1150 static ieee80211_tx_result
1151 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1152 struct ieee80211_tx_data *tx,
1153 struct sta_info *sta, struct sk_buff *skb)
1155 struct ieee80211_local *local = sdata->local;
1156 struct ieee80211_hdr *hdr;
1157 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1160 memset(tx, 0, sizeof(*tx));
1164 __skb_queue_head_init(&tx->skbs);
1167 * If this flag is set to true anywhere, and we get here,
1168 * we are doing the needed processing, so remove the flag
1171 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1173 hdr = (struct ieee80211_hdr *) skb->data;
1179 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1180 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1181 if (!tx->sta && sdata->wdev.use_4addr)
1183 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1184 IEEE80211_TX_CTL_INJECTED) ||
1185 tx->sdata->control_port_protocol == tx->skb->protocol) {
1186 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1188 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1189 tx->sta = sta_info_get(sdata, hdr->addr1);
1192 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1193 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1194 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1195 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1196 struct tid_ampdu_tx *tid_tx;
1198 tid = ieee80211_get_tid(hdr);
1200 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1204 queued = ieee80211_tx_prep_agg(tx, skb, info,
1207 if (unlikely(queued))
1212 if (is_multicast_ether_addr(hdr->addr1)) {
1213 tx->flags &= ~IEEE80211_TX_UNICAST;
1214 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1216 tx->flags |= IEEE80211_TX_UNICAST;
1218 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1219 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1220 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1221 info->flags & IEEE80211_TX_CTL_AMPDU)
1222 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1226 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1227 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1228 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1229 ieee80211_check_fast_xmit(tx->sta);
1232 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1237 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1238 struct ieee80211_vif *vif,
1239 struct sta_info *sta,
1240 struct sk_buff *skb)
1242 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1243 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1244 struct ieee80211_txq *txq = NULL;
1246 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1247 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1250 if (!ieee80211_is_data(hdr->frame_control))
1254 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1259 txq = sta->sta.txq[tid];
1267 return to_txq_info(txq);
1270 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1272 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1275 static u32 codel_skb_len_func(const struct sk_buff *skb)
1280 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1282 const struct ieee80211_tx_info *info;
1284 info = (const struct ieee80211_tx_info *)skb->cb;
1285 return info->control.enqueue_time;
1288 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1291 struct ieee80211_local *local;
1292 struct txq_info *txqi;
1294 struct fq_flow *flow;
1297 local = vif_to_sdata(txqi->txq.vif)->local;
1300 if (cvars == &txqi->def_cvars)
1301 flow = &txqi->def_flow;
1303 flow = &fq->flows[cvars - local->cvars];
1305 return fq_flow_dequeue(fq, flow);
1308 static void codel_drop_func(struct sk_buff *skb,
1311 struct ieee80211_local *local;
1312 struct ieee80211_hw *hw;
1313 struct txq_info *txqi;
1316 local = vif_to_sdata(txqi->txq.vif)->local;
1319 ieee80211_free_txskb(hw, skb);
1322 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1324 struct fq_flow *flow)
1326 struct ieee80211_local *local;
1327 struct txq_info *txqi;
1328 struct codel_vars *cvars;
1329 struct codel_params *cparams;
1330 struct codel_stats *cstats;
1332 local = container_of(fq, struct ieee80211_local, fq);
1333 txqi = container_of(tin, struct txq_info, tin);
1334 cstats = &txqi->cstats;
1336 if (txqi->txq.sta) {
1337 struct sta_info *sta = container_of(txqi->txq.sta,
1338 struct sta_info, sta);
1339 cparams = &sta->cparams;
1341 cparams = &local->cparams;
1344 if (flow == &txqi->def_flow)
1345 cvars = &txqi->def_cvars;
1347 cvars = &local->cvars[flow - fq->flows];
1349 return codel_dequeue(txqi,
1355 codel_skb_time_func,
1357 codel_dequeue_func);
1360 static void fq_skb_free_func(struct fq *fq,
1362 struct fq_flow *flow,
1363 struct sk_buff *skb)
1365 struct ieee80211_local *local;
1367 local = container_of(fq, struct ieee80211_local, fq);
1368 ieee80211_free_txskb(&local->hw, skb);
1371 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1374 struct sk_buff *skb)
1376 struct txq_info *txqi;
1378 txqi = container_of(tin, struct txq_info, tin);
1379 return &txqi->def_flow;
1382 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1383 struct txq_info *txqi,
1384 struct sk_buff *skb)
1386 struct fq *fq = &local->fq;
1387 struct fq_tin *tin = &txqi->tin;
1389 ieee80211_set_skb_enqueue_time(skb);
1390 fq_tin_enqueue(fq, tin, skb,
1392 fq_flow_get_default_func);
1395 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1396 struct fq_flow *flow, struct sk_buff *skb,
1399 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1401 return info->control.vif == data;
1404 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1405 struct ieee80211_sub_if_data *sdata)
1407 struct fq *fq = &local->fq;
1408 struct txq_info *txqi;
1410 struct ieee80211_sub_if_data *ap;
1412 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1415 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1420 txqi = to_txq_info(ap->vif.txq);
1423 spin_lock_bh(&fq->lock);
1424 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1426 spin_unlock_bh(&fq->lock);
1429 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1430 struct sta_info *sta,
1431 struct txq_info *txqi, int tid)
1433 fq_tin_init(&txqi->tin);
1434 fq_flow_init(&txqi->def_flow);
1435 codel_vars_init(&txqi->def_cvars);
1436 codel_stats_init(&txqi->cstats);
1437 __skb_queue_head_init(&txqi->frags);
1439 txqi->txq.vif = &sdata->vif;
1442 txqi->txq.sta = &sta->sta;
1443 sta->sta.txq[tid] = &txqi->txq;
1444 txqi->txq.tid = tid;
1445 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1447 sdata->vif.txq = &txqi->txq;
1449 txqi->txq.ac = IEEE80211_AC_BE;
1453 void ieee80211_txq_purge(struct ieee80211_local *local,
1454 struct txq_info *txqi)
1456 struct fq *fq = &local->fq;
1457 struct fq_tin *tin = &txqi->tin;
1459 fq_tin_reset(fq, tin, fq_skb_free_func);
1460 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1463 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1465 struct fq *fq = &local->fq;
1468 bool supp_vht = false;
1469 enum nl80211_band band;
1471 if (!local->ops->wake_tx_queue)
1474 ret = fq_init(fq, 4096);
1479 * If the hardware doesn't support VHT, it is safe to limit the maximum
1480 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1482 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1483 struct ieee80211_supported_band *sband;
1485 sband = local->hw.wiphy->bands[band];
1489 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1493 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1495 codel_params_init(&local->cparams);
1496 local->cparams.interval = MS2TIME(100);
1497 local->cparams.target = MS2TIME(20);
1498 local->cparams.ecn = true;
1500 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1502 if (!local->cvars) {
1503 spin_lock_bh(&fq->lock);
1504 fq_reset(fq, fq_skb_free_func);
1505 spin_unlock_bh(&fq->lock);
1509 for (i = 0; i < fq->flows_cnt; i++)
1510 codel_vars_init(&local->cvars[i]);
1515 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1517 struct fq *fq = &local->fq;
1519 if (!local->ops->wake_tx_queue)
1522 kfree(local->cvars);
1523 local->cvars = NULL;
1525 spin_lock_bh(&fq->lock);
1526 fq_reset(fq, fq_skb_free_func);
1527 spin_unlock_bh(&fq->lock);
1530 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1531 struct ieee80211_sub_if_data *sdata,
1532 struct sta_info *sta,
1533 struct sk_buff *skb)
1535 struct fq *fq = &local->fq;
1536 struct ieee80211_vif *vif;
1537 struct txq_info *txqi;
1539 if (!local->ops->wake_tx_queue ||
1540 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1543 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1544 sdata = container_of(sdata->bss,
1545 struct ieee80211_sub_if_data, u.ap);
1548 txqi = ieee80211_get_txq(local, vif, sta, skb);
1553 spin_lock_bh(&fq->lock);
1554 ieee80211_txq_enqueue(local, txqi, skb);
1555 spin_unlock_bh(&fq->lock);
1557 drv_wake_tx_queue(local, txqi);
1562 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1563 struct ieee80211_vif *vif,
1564 struct ieee80211_sta *sta,
1565 struct sk_buff_head *skbs,
1568 struct ieee80211_tx_control control = {};
1569 struct sk_buff *skb, *tmp;
1570 unsigned long flags;
1572 skb_queue_walk_safe(skbs, skb, tmp) {
1573 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1574 int q = info->hw_queue;
1576 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1577 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1578 __skb_unlink(skb, skbs);
1579 ieee80211_free_txskb(&local->hw, skb);
1584 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1585 if (local->queue_stop_reasons[q] ||
1586 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1587 if (unlikely(info->flags &
1588 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1589 if (local->queue_stop_reasons[q] &
1590 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1592 * Drop off-channel frames if queues
1593 * are stopped for any reason other
1594 * than off-channel operation. Never
1597 spin_unlock_irqrestore(
1598 &local->queue_stop_reason_lock,
1600 ieee80211_purge_tx_queue(&local->hw,
1607 * Since queue is stopped, queue up frames for
1608 * later transmission from the tx-pending
1609 * tasklet when the queue is woken again.
1612 skb_queue_splice_init(skbs,
1613 &local->pending[q]);
1615 skb_queue_splice_tail_init(skbs,
1616 &local->pending[q]);
1618 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1623 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1625 info->control.vif = vif;
1628 __skb_unlink(skb, skbs);
1629 drv_tx(local, &control, skb);
1636 * Returns false if the frame couldn't be transmitted but was queued instead.
1638 static bool __ieee80211_tx(struct ieee80211_local *local,
1639 struct sk_buff_head *skbs, int led_len,
1640 struct sta_info *sta, bool txpending)
1642 struct ieee80211_tx_info *info;
1643 struct ieee80211_sub_if_data *sdata;
1644 struct ieee80211_vif *vif;
1645 struct ieee80211_sta *pubsta;
1646 struct sk_buff *skb;
1650 if (WARN_ON(skb_queue_empty(skbs)))
1653 skb = skb_peek(skbs);
1654 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1655 info = IEEE80211_SKB_CB(skb);
1656 sdata = vif_to_sdata(info->control.vif);
1657 if (sta && !sta->uploaded)
1665 switch (sdata->vif.type) {
1666 case NL80211_IFTYPE_MONITOR:
1667 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1671 sdata = rcu_dereference(local->monitor_sdata);
1675 vif->hw_queue[skb_get_queue_mapping(skb)];
1676 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1677 ieee80211_purge_tx_queue(&local->hw, skbs);
1682 case NL80211_IFTYPE_AP_VLAN:
1683 sdata = container_of(sdata->bss,
1684 struct ieee80211_sub_if_data, u.ap);
1691 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1694 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1696 WARN_ON_ONCE(!skb_queue_empty(skbs));
1702 * Invoke TX handlers, return 0 on success and non-zero if the
1703 * frame was dropped or queued.
1705 * The handlers are split into an early and late part. The latter is everything
1706 * that can be sensitive to reordering, and will be deferred to after packets
1707 * are dequeued from the intermediate queues (when they are enabled).
1709 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1711 ieee80211_tx_result res = TX_DROP;
1713 #define CALL_TXH(txh) \
1716 if (res != TX_CONTINUE) \
1720 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1721 CALL_TXH(ieee80211_tx_h_check_assoc);
1722 CALL_TXH(ieee80211_tx_h_ps_buf);
1723 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1724 CALL_TXH(ieee80211_tx_h_select_key);
1725 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1726 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1729 if (unlikely(res == TX_DROP)) {
1730 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1732 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1734 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1736 } else if (unlikely(res == TX_QUEUED)) {
1737 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1745 * Late handlers can be called while the sta lock is held. Handlers that can
1746 * cause packets to be generated will cause deadlock!
1748 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1750 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1751 ieee80211_tx_result res = TX_CONTINUE;
1753 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1754 __skb_queue_tail(&tx->skbs, tx->skb);
1759 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1760 CALL_TXH(ieee80211_tx_h_sequence);
1761 CALL_TXH(ieee80211_tx_h_fragment);
1762 /* handlers after fragment must be aware of tx info fragmentation! */
1763 CALL_TXH(ieee80211_tx_h_stats);
1764 CALL_TXH(ieee80211_tx_h_encrypt);
1765 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1766 CALL_TXH(ieee80211_tx_h_calculate_duration);
1770 if (unlikely(res == TX_DROP)) {
1771 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1773 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1775 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1777 } else if (unlikely(res == TX_QUEUED)) {
1778 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1785 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1787 int r = invoke_tx_handlers_early(tx);
1791 return invoke_tx_handlers_late(tx);
1794 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1795 struct ieee80211_vif *vif, struct sk_buff *skb,
1796 int band, struct ieee80211_sta **sta)
1798 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1799 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1800 struct ieee80211_tx_data tx;
1801 struct sk_buff *skb2;
1803 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1807 info->control.vif = vif;
1808 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1810 if (invoke_tx_handlers(&tx))
1815 *sta = &tx.sta->sta;
1820 /* this function isn't suitable for fragmented data frames */
1821 skb2 = __skb_dequeue(&tx.skbs);
1822 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1823 ieee80211_free_txskb(hw, skb2);
1824 ieee80211_purge_tx_queue(hw, &tx.skbs);
1830 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1833 * Returns false if the frame couldn't be transmitted but was queued instead.
1835 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1836 struct sta_info *sta, struct sk_buff *skb,
1839 struct ieee80211_local *local = sdata->local;
1840 struct ieee80211_tx_data tx;
1841 ieee80211_tx_result res_prepare;
1842 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1846 if (unlikely(skb->len < 10)) {
1851 /* initialises tx */
1853 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1855 if (unlikely(res_prepare == TX_DROP)) {
1856 ieee80211_free_txskb(&local->hw, skb);
1858 } else if (unlikely(res_prepare == TX_QUEUED)) {
1862 /* set up hw_queue value early */
1863 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1864 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1866 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1868 if (invoke_tx_handlers_early(&tx))
1871 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1874 if (!invoke_tx_handlers_late(&tx))
1875 result = __ieee80211_tx(local, &tx.skbs, led_len,
1881 /* device xmit handlers */
1883 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1884 struct sk_buff *skb,
1885 int head_need, bool may_encrypt)
1887 struct ieee80211_local *local = sdata->local;
1890 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1891 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1892 tail_need -= skb_tailroom(skb);
1893 tail_need = max_t(int, tail_need, 0);
1896 if (skb_cloned(skb) &&
1897 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1898 !skb_clone_writable(skb, ETH_HLEN) ||
1899 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1900 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1901 else if (head_need || tail_need)
1902 I802_DEBUG_INC(local->tx_expand_skb_head);
1906 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1907 wiphy_debug(local->hw.wiphy,
1908 "failed to reallocate TX buffer\n");
1915 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1916 struct sta_info *sta, struct sk_buff *skb)
1918 struct ieee80211_local *local = sdata->local;
1919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1920 struct ieee80211_hdr *hdr;
1924 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1926 headroom = local->tx_headroom;
1928 headroom += sdata->encrypt_headroom;
1929 headroom -= skb_headroom(skb);
1930 headroom = max_t(int, 0, headroom);
1932 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1933 ieee80211_free_txskb(&local->hw, skb);
1937 hdr = (struct ieee80211_hdr *) skb->data;
1938 info->control.vif = &sdata->vif;
1940 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1941 if (ieee80211_is_data(hdr->frame_control) &&
1942 is_unicast_ether_addr(hdr->addr1)) {
1943 if (mesh_nexthop_resolve(sdata, skb))
1944 return; /* skb queued: don't free */
1946 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1950 ieee80211_set_qos_hdr(sdata, skb);
1951 ieee80211_tx(sdata, sta, skb, false);
1954 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1955 struct sk_buff *skb)
1957 struct ieee80211_radiotap_iterator iterator;
1958 struct ieee80211_radiotap_header *rthdr =
1959 (struct ieee80211_radiotap_header *) skb->data;
1960 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1961 struct ieee80211_supported_band *sband =
1962 local->hw.wiphy->bands[info->band];
1963 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1967 bool rate_found = false;
1968 u8 rate_retries = 0;
1970 u8 mcs_known, mcs_flags, mcs_bw;
1972 u8 vht_mcs = 0, vht_nss = 0;
1975 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1976 IEEE80211_TX_CTL_DONTFRAG;
1979 * for every radiotap entry that is present
1980 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1981 * entries present, or -EINVAL on error)
1985 ret = ieee80211_radiotap_iterator_next(&iterator);
1990 /* see if this argument is something we can use */
1991 switch (iterator.this_arg_index) {
1993 * You must take care when dereferencing iterator.this_arg
1994 * for multibyte types... the pointer is not aligned. Use
1995 * get_unaligned((type *)iterator.this_arg) to dereference
1996 * iterator.this_arg for type "type" safely on all arches.
1998 case IEEE80211_RADIOTAP_FLAGS:
1999 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2001 * this indicates that the skb we have been
2002 * handed has the 32-bit FCS CRC at the end...
2003 * we should react to that by snipping it off
2004 * because it will be recomputed and added
2007 if (skb->len < (iterator._max_length + FCS_LEN))
2010 skb_trim(skb, skb->len - FCS_LEN);
2012 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2013 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2014 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2015 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2018 case IEEE80211_RADIOTAP_TX_FLAGS:
2019 txflags = get_unaligned_le16(iterator.this_arg);
2020 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2021 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2024 case IEEE80211_RADIOTAP_RATE:
2025 rate = *iterator.this_arg;
2030 case IEEE80211_RADIOTAP_DATA_RETRIES:
2031 rate_retries = *iterator.this_arg;
2034 case IEEE80211_RADIOTAP_MCS:
2035 mcs_known = iterator.this_arg[0];
2036 mcs_flags = iterator.this_arg[1];
2037 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2041 rate = iterator.this_arg[2];
2042 rate_flags = IEEE80211_TX_RC_MCS;
2044 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2045 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2046 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2048 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2049 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2050 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2051 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2054 case IEEE80211_RADIOTAP_VHT:
2055 vht_known = get_unaligned_le16(iterator.this_arg);
2058 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2059 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2060 (iterator.this_arg[2] &
2061 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2062 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2064 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2065 if (iterator.this_arg[3] == 1)
2067 IEEE80211_TX_RC_40_MHZ_WIDTH;
2068 else if (iterator.this_arg[3] == 4)
2070 IEEE80211_TX_RC_80_MHZ_WIDTH;
2071 else if (iterator.this_arg[3] == 11)
2073 IEEE80211_TX_RC_160_MHZ_WIDTH;
2076 vht_mcs = iterator.this_arg[4] >> 4;
2077 vht_nss = iterator.this_arg[4] & 0xF;
2081 * Please update the file
2082 * Documentation/networking/mac80211-injection.txt
2083 * when parsing new fields here.
2091 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2095 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2097 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2098 info->control.rates[i].idx = -1;
2099 info->control.rates[i].flags = 0;
2100 info->control.rates[i].count = 0;
2103 if (rate_flags & IEEE80211_TX_RC_MCS) {
2104 info->control.rates[0].idx = rate;
2105 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2106 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2109 for (i = 0; i < sband->n_bitrates; i++) {
2110 if (rate * 5 != sband->bitrates[i].bitrate)
2113 info->control.rates[0].idx = i;
2118 if (info->control.rates[0].idx < 0)
2119 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2121 info->control.rates[0].flags = rate_flags;
2122 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2123 local->hw.max_rate_tries);
2127 * remove the radiotap header
2128 * iterator->_max_length was sanity-checked against
2129 * skb->len by iterator init
2131 skb_pull(skb, iterator._max_length);
2136 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2137 struct net_device *dev)
2139 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2140 struct ieee80211_chanctx_conf *chanctx_conf;
2141 struct ieee80211_radiotap_header *prthdr =
2142 (struct ieee80211_radiotap_header *)skb->data;
2143 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2144 struct ieee80211_hdr *hdr;
2145 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2146 struct cfg80211_chan_def *chandef;
2150 /* check for not even having the fixed radiotap header part */
2151 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2152 goto fail; /* too short to be possibly valid */
2154 /* is it a header version we can trust to find length from? */
2155 if (unlikely(prthdr->it_version))
2156 goto fail; /* only version 0 is supported */
2158 /* then there must be a radiotap header with a length we can use */
2159 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2161 /* does the skb contain enough to deliver on the alleged length? */
2162 if (unlikely(skb->len < len_rthdr))
2163 goto fail; /* skb too short for claimed rt header extent */
2166 * fix up the pointers accounting for the radiotap
2167 * header still being in there. We are being given
2168 * a precooked IEEE80211 header so no need for
2171 skb_set_mac_header(skb, len_rthdr);
2173 * these are just fixed to the end of the rt area since we
2174 * don't have any better information and at this point, nobody cares
2176 skb_set_network_header(skb, len_rthdr);
2177 skb_set_transport_header(skb, len_rthdr);
2179 if (skb->len < len_rthdr + 2)
2182 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2183 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2185 if (skb->len < len_rthdr + hdrlen)
2189 * Initialize skb->protocol if the injected frame is a data frame
2190 * carrying a rfc1042 header
2192 if (ieee80211_is_data(hdr->frame_control) &&
2193 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2194 u8 *payload = (u8 *)hdr + hdrlen;
2196 if (ether_addr_equal(payload, rfc1042_header))
2197 skb->protocol = cpu_to_be16((payload[6] << 8) |
2201 memset(info, 0, sizeof(*info));
2203 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2204 IEEE80211_TX_CTL_INJECTED;
2209 * We process outgoing injected frames that have a local address
2210 * we handle as though they are non-injected frames.
2211 * This code here isn't entirely correct, the local MAC address
2212 * isn't always enough to find the interface to use; for proper
2213 * VLAN/WDS support we will need a different mechanism (which
2214 * likely isn't going to be monitor interfaces).
2216 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2218 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2219 if (!ieee80211_sdata_running(tmp_sdata))
2221 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2222 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2223 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2225 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2231 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2232 if (!chanctx_conf) {
2233 tmp_sdata = rcu_dereference(local->monitor_sdata);
2236 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2240 chandef = &chanctx_conf->def;
2241 else if (!local->use_chanctx)
2242 chandef = &local->_oper_chandef;
2247 * Frame injection is not allowed if beaconing is not allowed
2248 * or if we need radar detection. Beaconing is usually not allowed when
2249 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2250 * Passive scan is also used in world regulatory domains where
2251 * your country is not known and as such it should be treated as
2252 * NO TX unless the channel is explicitly allowed in which case
2253 * your current regulatory domain would not have the passive scan
2256 * Since AP mode uses monitor interfaces to inject/TX management
2257 * frames we can make AP mode the exception to this rule once it
2258 * supports radar detection as its implementation can deal with
2259 * radar detection by itself. We can do that later by adding a
2260 * monitor flag interfaces used for AP support.
2262 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2266 info->band = chandef->chan->band;
2268 /* process and remove the injection radiotap header */
2269 if (!ieee80211_parse_tx_radiotap(local, skb))
2272 ieee80211_xmit(sdata, NULL, skb);
2275 return NETDEV_TX_OK;
2281 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2284 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2286 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2288 return ethertype == ETH_P_TDLS &&
2290 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2293 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2294 struct sk_buff *skb,
2295 struct sta_info **sta_out)
2297 struct sta_info *sta;
2299 switch (sdata->vif.type) {
2300 case NL80211_IFTYPE_AP_VLAN:
2301 sta = rcu_dereference(sdata->u.vlan.sta);
2305 } else if (sdata->wdev.use_4addr) {
2309 case NL80211_IFTYPE_AP:
2310 case NL80211_IFTYPE_OCB:
2311 case NL80211_IFTYPE_ADHOC:
2312 if (is_multicast_ether_addr(skb->data)) {
2313 *sta_out = ERR_PTR(-ENOENT);
2316 sta = sta_info_get_bss(sdata, skb->data);
2318 case NL80211_IFTYPE_WDS:
2319 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2321 #ifdef CONFIG_MAC80211_MESH
2322 case NL80211_IFTYPE_MESH_POINT:
2323 /* determined much later */
2327 case NL80211_IFTYPE_STATION:
2328 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2329 sta = sta_info_get(sdata, skb->data);
2330 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2331 if (test_sta_flag(sta,
2332 WLAN_STA_TDLS_PEER_AUTH)) {
2338 * TDLS link during setup - throw out frames to
2339 * peer. Allow TDLS-setup frames to unauthorized
2340 * peers for the special case of a link teardown
2341 * after a TDLS sta is removed due to being
2344 if (!ieee80211_is_tdls_setup(skb))
2350 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2358 *sta_out = sta ?: ERR_PTR(-ENOENT);
2363 * ieee80211_build_hdr - build 802.11 header in the given frame
2364 * @sdata: virtual interface to build the header for
2365 * @skb: the skb to build the header in
2366 * @info_flags: skb flags to set
2368 * This function takes the skb with 802.3 header and reformats the header to
2369 * the appropriate IEEE 802.11 header based on which interface the packet is
2370 * being transmitted on.
2372 * Note that this function also takes care of the TX status request and
2373 * potential unsharing of the SKB - this needs to be interleaved with the
2376 * The function requires the read-side RCU lock held
2378 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2380 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2381 struct sk_buff *skb, u32 info_flags,
2382 struct sta_info *sta)
2384 struct ieee80211_local *local = sdata->local;
2385 struct ieee80211_tx_info *info;
2387 u16 ethertype, hdrlen, meshhdrlen = 0;
2389 struct ieee80211_hdr hdr;
2390 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2391 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2392 const u8 *encaps_data;
2393 int encaps_len, skip_header_bytes;
2394 bool wme_sta = false, authorized = false;
2398 struct ieee80211_chanctx_conf *chanctx_conf;
2399 struct ieee80211_sub_if_data *ap_sdata;
2400 enum nl80211_band band;
2406 /* convert Ethernet header to proper 802.11 header (based on
2407 * operation mode) */
2408 ethertype = (skb->data[12] << 8) | skb->data[13];
2409 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2411 switch (sdata->vif.type) {
2412 case NL80211_IFTYPE_AP_VLAN:
2413 if (sdata->wdev.use_4addr) {
2414 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2416 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2417 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2418 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2419 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2421 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2422 wme_sta = sta->sta.wme;
2424 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2426 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2427 if (!chanctx_conf) {
2431 band = chanctx_conf->def.chan->band;
2432 if (sdata->wdev.use_4addr)
2435 case NL80211_IFTYPE_AP:
2436 if (sdata->vif.type == NL80211_IFTYPE_AP)
2437 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2438 if (!chanctx_conf) {
2442 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2444 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2445 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2446 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2448 band = chanctx_conf->def.chan->band;
2450 case NL80211_IFTYPE_WDS:
2451 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2453 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2454 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2455 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2456 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2459 * This is the exception! WDS style interfaces are prohibited
2460 * when channel contexts are in used so this must be valid
2462 band = local->hw.conf.chandef.chan->band;
2464 #ifdef CONFIG_MAC80211_MESH
2465 case NL80211_IFTYPE_MESH_POINT:
2466 if (!is_multicast_ether_addr(skb->data)) {
2467 struct sta_info *next_hop;
2468 bool mpp_lookup = true;
2470 mpath = mesh_path_lookup(sdata, skb->data);
2473 next_hop = rcu_dereference(mpath->next_hop);
2475 !(mpath->flags & (MESH_PATH_ACTIVE |
2476 MESH_PATH_RESOLVING)))
2481 mppath = mpp_path_lookup(sdata, skb->data);
2483 mppath->exp_time = jiffies;
2486 if (mppath && mpath)
2487 mesh_path_del(sdata, mpath->dst);
2491 * Use address extension if it is a packet from
2492 * another interface or if we know the destination
2493 * is being proxied by a portal (i.e. portal address
2494 * differs from proxied address)
2496 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2497 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2498 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2499 skb->data, skb->data + ETH_ALEN);
2500 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2503 /* DS -> MBSS (802.11-2012 13.11.3.3).
2504 * For unicast with unknown forwarding information,
2505 * destination might be in the MBSS or if that fails
2506 * forwarded to another mesh gate. In either case
2507 * resolution will be handled in ieee80211_xmit(), so
2508 * leave the original DA. This also works for mcast */
2509 const u8 *mesh_da = skb->data;
2512 mesh_da = mppath->mpp;
2514 mesh_da = mpath->dst;
2516 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2517 mesh_da, sdata->vif.addr);
2518 if (is_multicast_ether_addr(mesh_da))
2519 /* DA TA mSA AE:SA */
2520 meshhdrlen = ieee80211_new_mesh_header(
2522 skb->data + ETH_ALEN, NULL);
2524 /* RA TA mDA mSA AE:DA SA */
2525 meshhdrlen = ieee80211_new_mesh_header(
2526 sdata, &mesh_hdr, skb->data,
2527 skb->data + ETH_ALEN);
2530 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2531 if (!chanctx_conf) {
2535 band = chanctx_conf->def.chan->band;
2538 case NL80211_IFTYPE_STATION:
2539 /* we already did checks when looking up the RA STA */
2540 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2544 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2545 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2546 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2548 } else if (sdata->u.mgd.use_4addr &&
2549 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2550 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2551 IEEE80211_FCTL_TODS);
2553 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2554 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2555 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2556 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2559 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2561 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2562 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2563 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2566 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2567 if (!chanctx_conf) {
2571 band = chanctx_conf->def.chan->band;
2573 case NL80211_IFTYPE_OCB:
2575 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2576 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2577 eth_broadcast_addr(hdr.addr3);
2579 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2580 if (!chanctx_conf) {
2584 band = chanctx_conf->def.chan->band;
2586 case NL80211_IFTYPE_ADHOC:
2588 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2589 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2590 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2592 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2593 if (!chanctx_conf) {
2597 band = chanctx_conf->def.chan->band;
2604 multicast = is_multicast_ether_addr(hdr.addr1);
2606 /* sta is always NULL for mesh */
2608 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2609 wme_sta = sta->sta.wme;
2610 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2611 /* For mesh, the use of the QoS header is mandatory */
2615 /* receiver does QoS (which also means we do) use it */
2617 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2622 * Drop unicast frames to unauthorised stations unless they are
2623 * EAPOL frames from the local station.
2625 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2626 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2627 !multicast && !authorized &&
2628 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2629 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2630 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2631 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2632 sdata->name, hdr.addr1);
2635 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2641 if (unlikely(!multicast && skb->sk &&
2642 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2643 struct sk_buff *ack_skb = skb_clone_sk(skb);
2646 unsigned long flags;
2649 spin_lock_irqsave(&local->ack_status_lock, flags);
2650 id = idr_alloc(&local->ack_status_frames, ack_skb,
2651 1, 0x10000, GFP_ATOMIC);
2652 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2656 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2664 * If the skb is shared we need to obtain our own copy.
2666 if (skb_shared(skb)) {
2667 struct sk_buff *tmp_skb = skb;
2669 /* can't happen -- skb is a clone if info_id != 0 */
2672 skb = skb_clone(skb, GFP_ATOMIC);
2681 hdr.frame_control = fc;
2682 hdr.duration_id = 0;
2685 skip_header_bytes = ETH_HLEN;
2686 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2687 encaps_data = bridge_tunnel_header;
2688 encaps_len = sizeof(bridge_tunnel_header);
2689 skip_header_bytes -= 2;
2690 } else if (ethertype >= ETH_P_802_3_MIN) {
2691 encaps_data = rfc1042_header;
2692 encaps_len = sizeof(rfc1042_header);
2693 skip_header_bytes -= 2;
2699 skb_pull(skb, skip_header_bytes);
2700 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2703 * So we need to modify the skb header and hence need a copy of
2704 * that. The head_need variable above doesn't, so far, include
2705 * the needed header space that we don't need right away. If we
2706 * can, then we don't reallocate right now but only after the
2707 * frame arrives at the master device (if it does...)
2709 * If we cannot, however, then we will reallocate to include all
2710 * the ever needed space. Also, if we need to reallocate it anyway,
2711 * make it big enough for everything we may ever need.
2714 if (head_need > 0 || skb_cloned(skb)) {
2715 head_need += sdata->encrypt_headroom;
2716 head_need += local->tx_headroom;
2717 head_need = max_t(int, 0, head_need);
2718 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2719 ieee80211_free_txskb(&local->hw, skb);
2721 return ERR_PTR(-ENOMEM);
2726 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2728 #ifdef CONFIG_MAC80211_MESH
2730 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2733 if (ieee80211_is_data_qos(fc)) {
2734 __le16 *qos_control;
2736 qos_control = skb_push(skb, 2);
2737 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2739 * Maybe we could actually set some fields here, for now just
2740 * initialise to zero to indicate no special operation.
2744 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2746 skb_reset_mac_header(skb);
2748 info = IEEE80211_SKB_CB(skb);
2749 memset(info, 0, sizeof(*info));
2751 info->flags = info_flags;
2752 info->ack_frame_id = info_id;
2758 return ERR_PTR(ret);
2762 * fast-xmit overview
2764 * The core idea of this fast-xmit is to remove per-packet checks by checking
2765 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2766 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2767 * much less work can be done per packet. For example, fragmentation must be
2768 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2771 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2772 * header and other data to aid packet processing in ieee80211_xmit_fast().
2774 * The most difficult part of this is that when any of these assumptions
2775 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2776 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2777 * since the per-packet code no longer checks the conditions. This is reflected
2778 * by the calls to these functions throughout the rest of the code, and must be
2779 * maintained if any of the TX path checks change.
2782 void ieee80211_check_fast_xmit(struct sta_info *sta)
2784 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2785 struct ieee80211_local *local = sta->local;
2786 struct ieee80211_sub_if_data *sdata = sta->sdata;
2787 struct ieee80211_hdr *hdr = (void *)build.hdr;
2788 struct ieee80211_chanctx_conf *chanctx_conf;
2791 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2794 /* Locking here protects both the pointer itself, and against concurrent
2795 * invocations winning data access races to, e.g., the key pointer that
2797 * Without it, the invocation of this function right after the key
2798 * pointer changes wouldn't be sufficient, as another CPU could access
2799 * the pointer, then stall, and then do the cache update after the CPU
2800 * that invalidated the key.
2801 * With the locking, such scenarios cannot happen as the check for the
2802 * key and the fast-tx assignment are done atomically, so the CPU that
2803 * modifies the key will either wait or other one will see the key
2804 * cleared/changed already.
2806 spin_lock_bh(&sta->lock);
2807 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2808 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2809 sdata->vif.type == NL80211_IFTYPE_STATION)
2812 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2815 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2816 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2817 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2818 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2821 if (sdata->noack_map)
2824 /* fast-xmit doesn't handle fragmentation at all */
2825 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2826 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2830 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2831 if (!chanctx_conf) {
2835 build.band = chanctx_conf->def.chan->band;
2838 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2840 switch (sdata->vif.type) {
2841 case NL80211_IFTYPE_ADHOC:
2843 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2844 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2845 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2848 case NL80211_IFTYPE_STATION:
2849 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2851 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2852 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2853 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2858 if (sdata->u.mgd.use_4addr) {
2859 /* non-regular ethertype cannot use the fastpath */
2860 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2861 IEEE80211_FCTL_TODS);
2863 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2864 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2865 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2866 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2870 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2872 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2873 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2874 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2877 case NL80211_IFTYPE_AP_VLAN:
2878 if (sdata->wdev.use_4addr) {
2879 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2880 IEEE80211_FCTL_TODS);
2882 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2883 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2884 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2885 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2890 case NL80211_IFTYPE_AP:
2891 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2893 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2894 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2895 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2899 /* not handled on fast-xmit */
2905 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2908 /* We store the key here so there's no point in using rcu_dereference()
2909 * but that's fine because the code that changes the pointers will call
2910 * this function after doing so. For a single CPU that would be enough,
2911 * for multiple see the comment above.
2913 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2915 build.key = rcu_access_pointer(sdata->default_unicast_key);
2917 bool gen_iv, iv_spc, mmic;
2919 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2920 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2921 mmic = build.key->conf.flags &
2922 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
2923 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
2925 /* don't handle software crypto */
2926 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2929 switch (build.key->conf.cipher) {
2930 case WLAN_CIPHER_SUITE_CCMP:
2931 case WLAN_CIPHER_SUITE_CCMP_256:
2932 /* add fixed key ID */
2934 (build.hdr + build.hdr_len)[3] =
2935 0x20 | (build.key->conf.keyidx << 6);
2936 build.pn_offs = build.hdr_len;
2938 if (gen_iv || iv_spc)
2939 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2941 case WLAN_CIPHER_SUITE_GCMP:
2942 case WLAN_CIPHER_SUITE_GCMP_256:
2943 /* add fixed key ID */
2945 (build.hdr + build.hdr_len)[3] =
2946 0x20 | (build.key->conf.keyidx << 6);
2947 build.pn_offs = build.hdr_len;
2949 if (gen_iv || iv_spc)
2950 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2952 case WLAN_CIPHER_SUITE_TKIP:
2953 /* cannot handle MMIC or IV generation in xmit-fast */
2957 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2959 case WLAN_CIPHER_SUITE_WEP40:
2960 case WLAN_CIPHER_SUITE_WEP104:
2961 /* cannot handle IV generation in fast-xmit */
2965 build.hdr_len += IEEE80211_WEP_IV_LEN;
2967 case WLAN_CIPHER_SUITE_AES_CMAC:
2968 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2969 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2970 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2972 "management cipher suite 0x%x enabled for data\n",
2973 build.key->conf.cipher);
2976 /* we don't know how to generate IVs for this at all */
2977 if (WARN_ON(gen_iv))
2979 /* pure hardware keys are OK, of course */
2980 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2982 /* cipher scheme might require space allocation */
2984 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2987 build.hdr_len += build.key->conf.iv_len;
2990 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2993 hdr->frame_control = fc;
2995 memcpy(build.hdr + build.hdr_len,
2996 rfc1042_header, sizeof(rfc1042_header));
2997 build.hdr_len += sizeof(rfc1042_header);
2999 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3000 /* if the kmemdup fails, continue w/o fast_tx */
3005 /* we might have raced against another call to this function */
3006 old = rcu_dereference_protected(sta->fast_tx,
3007 lockdep_is_held(&sta->lock));
3008 rcu_assign_pointer(sta->fast_tx, fast_tx);
3010 kfree_rcu(old, rcu_head);
3011 spin_unlock_bh(&sta->lock);
3014 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3016 struct sta_info *sta;
3019 list_for_each_entry_rcu(sta, &local->sta_list, list)
3020 ieee80211_check_fast_xmit(sta);
3024 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3026 struct ieee80211_local *local = sdata->local;
3027 struct sta_info *sta;
3031 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3032 if (sdata != sta->sdata &&
3033 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3035 ieee80211_check_fast_xmit(sta);
3041 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3043 struct ieee80211_fast_tx *fast_tx;
3045 spin_lock_bh(&sta->lock);
3046 fast_tx = rcu_dereference_protected(sta->fast_tx,
3047 lockdep_is_held(&sta->lock));
3048 RCU_INIT_POINTER(sta->fast_tx, NULL);
3049 spin_unlock_bh(&sta->lock);
3052 kfree_rcu(fast_tx, rcu_head);
3055 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3056 struct sk_buff *skb, int headroom,
3059 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3060 int padding = (4 - amsdu_len) & 3;
3062 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3063 I802_DEBUG_INC(local->tx_expand_skb_head);
3065 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3066 wiphy_debug(local->hw.wiphy,
3067 "failed to reallocate TX buffer\n");
3073 *subframe_len += padding;
3074 skb_put_zero(skb, padding);
3080 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3081 struct ieee80211_fast_tx *fast_tx,
3082 struct sk_buff *skb)
3084 struct ieee80211_local *local = sdata->local;
3085 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3086 struct ieee80211_hdr *hdr;
3087 struct ethhdr *amsdu_hdr;
3088 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3089 int subframe_len = skb->len - hdr_len;
3091 u8 *qc, *h_80211_src, *h_80211_dst;
3094 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3097 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3100 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr),
3104 data = skb_push(skb, sizeof(*amsdu_hdr));
3105 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3107 amsdu_hdr = data + hdr_len;
3108 /* h_80211_src/dst is addr* field within hdr */
3109 h_80211_src = data + fast_tx->sa_offs;
3110 h_80211_dst = data + fast_tx->da_offs;
3112 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3113 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3114 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3116 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3117 * fields needs to be changed to BSSID for A-MSDU frames depending
3118 * on FromDS/ToDS values.
3120 switch (sdata->vif.type) {
3121 case NL80211_IFTYPE_STATION:
3122 bssid = sdata->u.mgd.bssid;
3124 case NL80211_IFTYPE_AP:
3125 case NL80211_IFTYPE_AP_VLAN:
3126 bssid = sdata->vif.addr;
3132 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3133 ether_addr_copy(h_80211_src, bssid);
3135 if (bssid && ieee80211_has_tods(hdr->frame_control))
3136 ether_addr_copy(h_80211_dst, bssid);
3138 qc = ieee80211_get_qos_ctl(hdr);
3139 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3141 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3146 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3147 struct sta_info *sta,
3148 struct ieee80211_fast_tx *fast_tx,
3149 struct sk_buff *skb)
3151 struct ieee80211_local *local = sdata->local;
3152 struct fq *fq = &local->fq;
3154 struct fq_flow *flow;
3155 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3156 struct ieee80211_txq *txq = sta->sta.txq[tid];
3157 struct txq_info *txqi;
3158 struct sk_buff **frag_tail, *head;
3159 int subframe_len = skb->len - ETH_ALEN;
3160 u8 max_subframes = sta->sta.max_amsdu_subframes;
3161 int max_frags = local->hw.max_tx_fragments;
3162 int max_amsdu_len = sta->sta.max_amsdu_len;
3166 unsigned int orig_len;
3169 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3175 txqi = to_txq_info(txq);
3176 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3179 if (sta->sta.max_rc_amsdu_len)
3180 max_amsdu_len = min_t(int, max_amsdu_len,
3181 sta->sta.max_rc_amsdu_len);
3183 spin_lock_bh(&fq->lock);
3185 /* TODO: Ideally aggregation should be done on dequeue to remain
3186 * responsive to environment changes.
3190 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3191 head = skb_peek_tail(&flow->queue);
3195 orig_len = head->len;
3197 if (skb->len + head->len > max_amsdu_len)
3200 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3203 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3204 nfrags += 1 + skb_shinfo(head)->nr_frags;
3205 frag_tail = &skb_shinfo(head)->frag_list;
3206 while (*frag_tail) {
3207 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3208 frag_tail = &(*frag_tail)->next;
3212 if (max_subframes && n > max_subframes)
3215 if (max_frags && nfrags > max_frags)
3218 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3223 data = skb_push(skb, ETH_ALEN + 2);
3224 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3226 data += 2 * ETH_ALEN;
3227 len = cpu_to_be16(subframe_len);
3228 memcpy(data, &len, 2);
3229 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3231 head->len += skb->len;
3232 head->data_len += skb->len;
3235 flow->backlog += head->len - orig_len;
3236 tin->backlog_bytes += head->len - orig_len;
3238 fq_recalc_backlog(fq, tin, flow);
3241 spin_unlock_bh(&fq->lock);
3247 * Can be called while the sta lock is held. Anything that can cause packets to
3248 * be generated will cause deadlock!
3250 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3251 struct sta_info *sta, u8 pn_offs,
3252 struct ieee80211_key *key,
3253 struct sk_buff *skb)
3255 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3256 struct ieee80211_hdr *hdr = (void *)skb->data;
3257 u8 tid = IEEE80211_NUM_TIDS;
3260 info->control.hw_key = &key->conf;
3262 ieee80211_tx_stats(skb->dev, skb->len);
3264 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3265 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3266 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3268 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3269 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3270 sdata->sequence_number += 0x10;
3273 if (skb_shinfo(skb)->gso_size)
3274 sta->tx_stats.msdu[tid] +=
3275 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3277 sta->tx_stats.msdu[tid]++;
3279 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3281 /* statistics normally done by ieee80211_tx_h_stats (but that
3282 * has to consider fragmentation, so is more complex)
3284 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3285 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3289 u8 *crypto_hdr = skb->data + pn_offs;
3291 switch (key->conf.cipher) {
3292 case WLAN_CIPHER_SUITE_CCMP:
3293 case WLAN_CIPHER_SUITE_CCMP_256:
3294 case WLAN_CIPHER_SUITE_GCMP:
3295 case WLAN_CIPHER_SUITE_GCMP_256:
3296 pn = atomic64_inc_return(&key->conf.tx_pn);
3298 crypto_hdr[1] = pn >> 8;
3299 crypto_hdr[4] = pn >> 16;
3300 crypto_hdr[5] = pn >> 24;
3301 crypto_hdr[6] = pn >> 32;
3302 crypto_hdr[7] = pn >> 40;
3308 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3309 struct sta_info *sta,
3310 struct ieee80211_fast_tx *fast_tx,
3311 struct sk_buff *skb)
3313 struct ieee80211_local *local = sdata->local;
3314 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3315 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3316 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3318 struct ieee80211_tx_info *info;
3319 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3320 struct ieee80211_tx_data tx;
3321 ieee80211_tx_result r;
3322 struct tid_ampdu_tx *tid_tx = NULL;
3323 u8 tid = IEEE80211_NUM_TIDS;
3325 /* control port protocol needs a lot of special handling */
3326 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3329 /* only RFC 1042 SNAP */
3330 if (ethertype < ETH_P_802_3_MIN)
3333 /* don't handle TX status request here either */
3334 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3337 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3338 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3339 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3341 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3343 if (tid_tx->timeout)
3344 tid_tx->last_tx = jiffies;
3348 /* after this point (skb is modified) we cannot return false */
3350 if (skb_shared(skb)) {
3351 struct sk_buff *tmp_skb = skb;
3353 skb = skb_clone(skb, GFP_ATOMIC);
3360 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3361 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3364 /* will not be crypto-handled beyond what we do here, so use false
3365 * as the may-encrypt argument for the resize to not account for
3366 * more room than we already have in 'extra_head'
3368 if (unlikely(ieee80211_skb_resize(sdata, skb,
3369 max_t(int, extra_head + hw_headroom -
3370 skb_headroom(skb), 0),
3376 memcpy(ð, skb->data, ETH_HLEN - 2);
3377 hdr = skb_push(skb, extra_head);
3378 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3379 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3380 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3382 info = IEEE80211_SKB_CB(skb);
3383 memset(info, 0, sizeof(*info));
3384 info->band = fast_tx->band;
3385 info->control.vif = &sdata->vif;
3386 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3387 IEEE80211_TX_CTL_DONTFRAG |
3388 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3389 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3391 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3392 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3393 *ieee80211_get_qos_ctl(hdr) = tid;
3396 __skb_queue_head_init(&tx.skbs);
3398 tx.flags = IEEE80211_TX_UNICAST;
3402 tx.key = fast_tx->key;
3404 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3406 r = ieee80211_tx_h_rate_ctrl(&tx);
3410 if (r != TX_CONTINUE) {
3417 if (ieee80211_queue_skb(local, sdata, sta, skb))
3420 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3423 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3424 sdata = container_of(sdata->bss,
3425 struct ieee80211_sub_if_data, u.ap);
3427 __skb_queue_tail(&tx.skbs, skb);
3428 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3432 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3433 struct ieee80211_txq *txq)
3435 struct ieee80211_local *local = hw_to_local(hw);
3436 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3437 struct ieee80211_hdr *hdr;
3438 struct sk_buff *skb = NULL;
3439 struct fq *fq = &local->fq;
3440 struct fq_tin *tin = &txqi->tin;
3441 struct ieee80211_tx_info *info;
3442 struct ieee80211_tx_data tx;
3443 ieee80211_tx_result r;
3444 struct ieee80211_vif *vif;
3446 spin_lock_bh(&fq->lock);
3448 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3451 /* Make sure fragments stay together. */
3452 skb = __skb_dequeue(&txqi->frags);
3457 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3461 hdr = (struct ieee80211_hdr *)skb->data;
3462 info = IEEE80211_SKB_CB(skb);
3464 memset(&tx, 0, sizeof(tx));
3465 __skb_queue_head_init(&tx.skbs);
3468 tx.sdata = vif_to_sdata(info->control.vif);
3471 tx.sta = container_of(txq->sta, struct sta_info, sta);
3474 * The key can be removed while the packet was queued, so need to call
3475 * this here to get the current key.
3477 r = ieee80211_tx_h_select_key(&tx);
3478 if (r != TX_CONTINUE) {
3479 ieee80211_free_txskb(&local->hw, skb);
3483 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3484 info->flags |= IEEE80211_TX_CTL_AMPDU;
3486 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3488 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3489 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3494 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3495 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3497 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3500 if (invoke_tx_handlers_late(&tx))
3503 skb = __skb_dequeue(&tx.skbs);
3505 if (!skb_queue_empty(&tx.skbs))
3506 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3509 if (skb && skb_has_frag_list(skb) &&
3510 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3511 if (skb_linearize(skb)) {
3512 ieee80211_free_txskb(&local->hw, skb);
3517 switch (tx.sdata->vif.type) {
3518 case NL80211_IFTYPE_MONITOR:
3519 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3520 vif = &tx.sdata->vif;
3523 tx.sdata = rcu_dereference(local->monitor_sdata);
3525 vif = &tx.sdata->vif;
3527 vif->hw_queue[skb_get_queue_mapping(skb)];
3528 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3529 ieee80211_free_txskb(&local->hw, skb);
3535 case NL80211_IFTYPE_AP_VLAN:
3536 tx.sdata = container_of(tx.sdata->bss,
3537 struct ieee80211_sub_if_data, u.ap);
3540 vif = &tx.sdata->vif;
3544 IEEE80211_SKB_CB(skb)->control.vif = vif;
3546 spin_unlock_bh(&fq->lock);
3550 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3552 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3553 struct net_device *dev,
3556 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3557 struct sta_info *sta;
3558 struct sk_buff *next;
3560 if (unlikely(skb->len < ETH_HLEN)) {
3567 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3570 if (!IS_ERR_OR_NULL(sta)) {
3571 struct ieee80211_fast_tx *fast_tx;
3573 /* We need a bit of data queued to build aggregates properly, so
3574 * instruct the TCP stack to allow more than a single ms of data
3575 * to be queued in the stack. The value is a bit-shift of 1
3576 * second, so 8 is ~4ms of queued data. Only affects local TCP
3579 sk_pacing_shift_update(skb->sk, 8);
3581 fast_tx = rcu_dereference(sta->fast_tx);
3584 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3588 if (skb_is_gso(skb)) {
3589 struct sk_buff *segs;
3591 segs = skb_gso_segment(skb, 0);
3599 /* we cannot process non-linear frames on this path */
3600 if (skb_linearize(skb)) {
3605 /* the frame could be fragmented, software-encrypted, and other
3606 * things so we cannot really handle checksum offload with it -
3607 * fix it up in software before we handle anything else.
3609 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3610 skb_set_transport_header(skb,
3611 skb_checksum_start_offset(skb));
3612 if (skb_checksum_help(skb))
3625 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3629 ieee80211_tx_stats(dev, skb->len);
3631 ieee80211_xmit(sdata, sta, skb);
3640 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3645 err = skb_ensure_writable(skb, ETH_HLEN);
3649 eth = (void *)skb->data;
3650 ether_addr_copy(eth->h_dest, sta->sta.addr);
3655 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3656 struct net_device *dev)
3658 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3659 const struct ethhdr *eth = (void *)skb->data;
3660 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3663 if (likely(!is_multicast_ether_addr(eth->h_dest)))
3666 switch (sdata->vif.type) {
3667 case NL80211_IFTYPE_AP_VLAN:
3668 if (sdata->u.vlan.sta)
3670 if (sdata->wdev.use_4addr)
3673 case NL80211_IFTYPE_AP:
3674 /* check runtime toggle for this bss */
3675 if (!sdata->bss->multicast_to_unicast)
3682 /* multicast to unicast conversion only for some payload */
3683 ethertype = eth->h_proto;
3684 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3685 ethertype = ethvlan->h_vlan_encapsulated_proto;
3686 switch (ethertype) {
3687 case htons(ETH_P_ARP):
3688 case htons(ETH_P_IP):
3689 case htons(ETH_P_IPV6):
3699 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3700 struct sk_buff_head *queue)
3702 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3703 struct ieee80211_local *local = sdata->local;
3704 const struct ethhdr *eth = (struct ethhdr *)skb->data;
3705 struct sta_info *sta, *first = NULL;
3706 struct sk_buff *cloned_skb;
3710 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3711 if (sdata != sta->sdata)
3712 /* AP-VLAN mismatch */
3714 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3715 /* do not send back to source */
3721 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3724 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3725 dev_kfree_skb(cloned_skb);
3728 __skb_queue_tail(queue, cloned_skb);
3731 if (likely(first)) {
3732 if (unlikely(ieee80211_change_da(skb, first)))
3734 __skb_queue_tail(queue, skb);
3736 /* no STA connected, drop */
3743 __skb_queue_purge(queue);
3744 __skb_queue_tail(queue, skb);
3750 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3751 * @skb: packet to be sent
3752 * @dev: incoming interface
3754 * On failure skb will be freed.
3756 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3757 struct net_device *dev)
3759 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3760 struct sk_buff_head queue;
3762 __skb_queue_head_init(&queue);
3763 ieee80211_convert_to_unicast(skb, dev, &queue);
3764 while ((skb = __skb_dequeue(&queue)))
3765 __ieee80211_subif_start_xmit(skb, dev, 0);
3767 __ieee80211_subif_start_xmit(skb, dev, 0);
3770 return NETDEV_TX_OK;
3774 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3775 struct sk_buff *skb, u32 info_flags)
3777 struct ieee80211_hdr *hdr;
3778 struct ieee80211_tx_data tx = {
3779 .local = sdata->local,
3782 struct sta_info *sta;
3786 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3788 skb = ERR_PTR(-EINVAL);
3792 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3796 hdr = (void *)skb->data;
3797 tx.sta = sta_info_get(sdata, hdr->addr1);
3800 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3803 return ERR_PTR(-EINVAL);
3812 * ieee80211_clear_tx_pending may not be called in a context where
3813 * it is possible that it packets could come in again.
3815 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3817 struct sk_buff *skb;
3820 for (i = 0; i < local->hw.queues; i++) {
3821 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3822 ieee80211_free_txskb(&local->hw, skb);
3827 * Returns false if the frame couldn't be transmitted but was queued instead,
3828 * which in this case means re-queued -- take as an indication to stop sending
3829 * more pending frames.
3831 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3832 struct sk_buff *skb)
3834 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3835 struct ieee80211_sub_if_data *sdata;
3836 struct sta_info *sta;
3837 struct ieee80211_hdr *hdr;
3839 struct ieee80211_chanctx_conf *chanctx_conf;
3841 sdata = vif_to_sdata(info->control.vif);
3843 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3844 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3845 if (unlikely(!chanctx_conf)) {
3849 info->band = chanctx_conf->def.chan->band;
3850 result = ieee80211_tx(sdata, NULL, skb, true);
3852 struct sk_buff_head skbs;
3854 __skb_queue_head_init(&skbs);
3855 __skb_queue_tail(&skbs, skb);
3857 hdr = (struct ieee80211_hdr *)skb->data;
3858 sta = sta_info_get(sdata, hdr->addr1);
3860 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3867 * Transmit all pending packets. Called from tasklet.
3869 void ieee80211_tx_pending(unsigned long data)
3871 struct ieee80211_local *local = (struct ieee80211_local *)data;
3872 unsigned long flags;
3878 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3879 for (i = 0; i < local->hw.queues; i++) {
3881 * If queue is stopped by something other than due to pending
3882 * frames, or we have no pending frames, proceed to next queue.
3884 if (local->queue_stop_reasons[i] ||
3885 skb_queue_empty(&local->pending[i]))
3888 while (!skb_queue_empty(&local->pending[i])) {
3889 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3890 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3892 if (WARN_ON(!info->control.vif)) {
3893 ieee80211_free_txskb(&local->hw, skb);
3897 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3900 txok = ieee80211_tx_pending_skb(local, skb);
3901 spin_lock_irqsave(&local->queue_stop_reason_lock,
3907 if (skb_queue_empty(&local->pending[i]))
3908 ieee80211_propagate_queue_wake(local, i);
3910 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3915 /* functions for drivers to get certain frames */
3917 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3918 struct ps_data *ps, struct sk_buff *skb,
3923 int i, have_bits = 0, n1, n2;
3925 /* Generate bitmap for TIM only if there are any STAs in power save
3927 if (atomic_read(&ps->num_sta_ps) > 0)
3928 /* in the hope that this is faster than
3929 * checking byte-for-byte */
3930 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3931 IEEE80211_MAX_AID+1);
3933 if (ps->dtim_count == 0)
3934 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3939 tim = pos = skb_put(skb, 6);
3940 *pos++ = WLAN_EID_TIM;
3942 *pos++ = ps->dtim_count;
3943 *pos++ = sdata->vif.bss_conf.dtim_period;
3945 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3948 ps->dtim_bc_mc = aid0 == 1;
3951 /* Find largest even number N1 so that bits numbered 1 through
3952 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3953 * (N2 + 1) x 8 through 2007 are 0. */
3955 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3962 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3969 /* Bitmap control */
3971 /* Part Virt Bitmap */
3972 skb_put(skb, n2 - n1);
3973 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3975 tim[1] = n2 - n1 + 4;
3977 *pos++ = aid0; /* Bitmap control */
3978 *pos++ = 0; /* Part Virt Bitmap */
3982 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3983 struct ps_data *ps, struct sk_buff *skb,
3986 struct ieee80211_local *local = sdata->local;
3989 * Not very nice, but we want to allow the driver to call
3990 * ieee80211_beacon_get() as a response to the set_tim()
3991 * callback. That, however, is already invoked under the
3992 * sta_lock to guarantee consistent and race-free update
3993 * of the tim bitmap in mac80211 and the driver.
3995 if (local->tim_in_locked_section) {
3996 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3998 spin_lock_bh(&local->tim_lock);
3999 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4000 spin_unlock_bh(&local->tim_lock);
4006 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
4007 struct beacon_data *beacon)
4009 struct probe_resp *resp;
4011 size_t beacon_data_len;
4013 u8 count = beacon->csa_current_counter;
4015 switch (sdata->vif.type) {
4016 case NL80211_IFTYPE_AP:
4017 beacon_data = beacon->tail;
4018 beacon_data_len = beacon->tail_len;
4020 case NL80211_IFTYPE_ADHOC:
4021 beacon_data = beacon->head;
4022 beacon_data_len = beacon->head_len;
4024 case NL80211_IFTYPE_MESH_POINT:
4025 beacon_data = beacon->head;
4026 beacon_data_len = beacon->head_len;
4033 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
4034 resp = rcu_dereference(sdata->u.ap.probe_resp);
4036 if (beacon->csa_counter_offsets[i]) {
4037 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
4043 beacon_data[beacon->csa_counter_offsets[i]] = count;
4046 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
4047 resp->data[resp->csa_counter_offsets[i]] = count;
4052 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
4054 beacon->csa_current_counter--;
4056 /* the counter should never reach 0 */
4057 WARN_ON_ONCE(!beacon->csa_current_counter);
4059 return beacon->csa_current_counter;
4062 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4064 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4065 struct beacon_data *beacon = NULL;
4070 if (sdata->vif.type == NL80211_IFTYPE_AP)
4071 beacon = rcu_dereference(sdata->u.ap.beacon);
4072 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4073 beacon = rcu_dereference(sdata->u.ibss.presp);
4074 else if (ieee80211_vif_is_mesh(&sdata->vif))
4075 beacon = rcu_dereference(sdata->u.mesh.beacon);
4080 count = __ieee80211_csa_update_counter(beacon);
4086 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4088 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4090 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4091 struct beacon_data *beacon = NULL;
4093 size_t beacon_data_len;
4096 if (!ieee80211_sdata_running(sdata))
4100 if (vif->type == NL80211_IFTYPE_AP) {
4101 struct ieee80211_if_ap *ap = &sdata->u.ap;
4103 beacon = rcu_dereference(ap->beacon);
4104 if (WARN_ON(!beacon || !beacon->tail))
4106 beacon_data = beacon->tail;
4107 beacon_data_len = beacon->tail_len;
4108 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4109 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4111 beacon = rcu_dereference(ifibss->presp);
4115 beacon_data = beacon->head;
4116 beacon_data_len = beacon->head_len;
4117 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4118 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4120 beacon = rcu_dereference(ifmsh->beacon);
4124 beacon_data = beacon->head;
4125 beacon_data_len = beacon->head_len;
4131 if (!beacon->csa_counter_offsets[0])
4134 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4137 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4144 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4146 static struct sk_buff *
4147 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4148 struct ieee80211_vif *vif,
4149 struct ieee80211_mutable_offsets *offs,
4152 struct ieee80211_local *local = hw_to_local(hw);
4153 struct beacon_data *beacon = NULL;
4154 struct sk_buff *skb = NULL;
4155 struct ieee80211_tx_info *info;
4156 struct ieee80211_sub_if_data *sdata = NULL;
4157 enum nl80211_band band;
4158 struct ieee80211_tx_rate_control txrc;
4159 struct ieee80211_chanctx_conf *chanctx_conf;
4160 int csa_off_base = 0;
4164 sdata = vif_to_sdata(vif);
4165 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4167 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4171 memset(offs, 0, sizeof(*offs));
4173 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4174 struct ieee80211_if_ap *ap = &sdata->u.ap;
4176 beacon = rcu_dereference(ap->beacon);
4178 if (beacon->csa_counter_offsets[0]) {
4180 __ieee80211_csa_update_counter(beacon);
4182 ieee80211_set_csa(sdata, beacon);
4186 * headroom, head length,
4187 * tail length and maximum TIM length
4189 skb = dev_alloc_skb(local->tx_headroom +
4191 beacon->tail_len + 256 +
4192 local->hw.extra_beacon_tailroom);
4196 skb_reserve(skb, local->tx_headroom);
4197 skb_put_data(skb, beacon->head, beacon->head_len);
4199 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4203 offs->tim_offset = beacon->head_len;
4204 offs->tim_length = skb->len - beacon->head_len;
4206 /* for AP the csa offsets are from tail */
4207 csa_off_base = skb->len;
4211 skb_put_data(skb, beacon->tail,
4215 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4216 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4217 struct ieee80211_hdr *hdr;
4219 beacon = rcu_dereference(ifibss->presp);
4223 if (beacon->csa_counter_offsets[0]) {
4225 __ieee80211_csa_update_counter(beacon);
4227 ieee80211_set_csa(sdata, beacon);
4230 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4231 local->hw.extra_beacon_tailroom);
4234 skb_reserve(skb, local->tx_headroom);
4235 skb_put_data(skb, beacon->head, beacon->head_len);
4237 hdr = (struct ieee80211_hdr *) skb->data;
4238 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4239 IEEE80211_STYPE_BEACON);
4240 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4241 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4243 beacon = rcu_dereference(ifmsh->beacon);
4247 if (beacon->csa_counter_offsets[0]) {
4249 /* TODO: For mesh csa_counter is in TU, so
4250 * decrementing it by one isn't correct, but
4251 * for now we leave it consistent with overall
4252 * mac80211's behavior.
4254 __ieee80211_csa_update_counter(beacon);
4256 ieee80211_set_csa(sdata, beacon);
4259 if (ifmsh->sync_ops)
4260 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4262 skb = dev_alloc_skb(local->tx_headroom +
4266 local->hw.extra_beacon_tailroom);
4269 skb_reserve(skb, local->tx_headroom);
4270 skb_put_data(skb, beacon->head, beacon->head_len);
4271 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4274 offs->tim_offset = beacon->head_len;
4275 offs->tim_length = skb->len - beacon->head_len;
4278 skb_put_data(skb, beacon->tail, beacon->tail_len);
4285 if (offs && beacon) {
4288 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4289 u16 csa_off = beacon->csa_counter_offsets[i];
4294 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4298 band = chanctx_conf->def.chan->band;
4300 info = IEEE80211_SKB_CB(skb);
4302 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4303 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4306 memset(&txrc, 0, sizeof(txrc));
4308 txrc.sband = local->hw.wiphy->bands[band];
4309 txrc.bss_conf = &sdata->vif.bss_conf;
4311 txrc.reported_rate.idx = -1;
4312 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4314 rate_control_get_rate(sdata, NULL, &txrc);
4316 info->control.vif = vif;
4318 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4319 IEEE80211_TX_CTL_ASSIGN_SEQ |
4320 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4328 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4329 struct ieee80211_vif *vif,
4330 struct ieee80211_mutable_offsets *offs)
4332 return __ieee80211_beacon_get(hw, vif, offs, true);
4334 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4336 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4337 struct ieee80211_vif *vif,
4338 u16 *tim_offset, u16 *tim_length)
4340 struct ieee80211_mutable_offsets offs = {};
4341 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4342 struct sk_buff *copy;
4343 struct ieee80211_supported_band *sband;
4350 *tim_offset = offs.tim_offset;
4353 *tim_length = offs.tim_length;
4355 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4356 !hw_to_local(hw)->monitors)
4359 /* send a copy to monitor interfaces */
4360 copy = skb_copy(bcn, GFP_ATOMIC);
4364 shift = ieee80211_vif_get_shift(vif);
4365 sband = ieee80211_get_sband(vif_to_sdata(vif));
4369 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4373 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4375 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4376 struct ieee80211_vif *vif)
4378 struct ieee80211_if_ap *ap = NULL;
4379 struct sk_buff *skb = NULL;
4380 struct probe_resp *presp = NULL;
4381 struct ieee80211_hdr *hdr;
4382 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4384 if (sdata->vif.type != NL80211_IFTYPE_AP)
4390 presp = rcu_dereference(ap->probe_resp);
4394 skb = dev_alloc_skb(presp->len);
4398 skb_put_data(skb, presp->data, presp->len);
4400 hdr = (struct ieee80211_hdr *) skb->data;
4401 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4407 EXPORT_SYMBOL(ieee80211_proberesp_get);
4409 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4410 struct ieee80211_vif *vif)
4412 struct ieee80211_sub_if_data *sdata;
4413 struct ieee80211_if_managed *ifmgd;
4414 struct ieee80211_pspoll *pspoll;
4415 struct ieee80211_local *local;
4416 struct sk_buff *skb;
4418 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4421 sdata = vif_to_sdata(vif);
4422 ifmgd = &sdata->u.mgd;
4423 local = sdata->local;
4425 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4429 skb_reserve(skb, local->hw.extra_tx_headroom);
4431 pspoll = skb_put_zero(skb, sizeof(*pspoll));
4432 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4433 IEEE80211_STYPE_PSPOLL);
4434 pspoll->aid = cpu_to_le16(ifmgd->aid);
4436 /* aid in PS-Poll has its two MSBs each set to 1 */
4437 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4439 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4440 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4444 EXPORT_SYMBOL(ieee80211_pspoll_get);
4446 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4447 struct ieee80211_vif *vif,
4450 struct ieee80211_hdr_3addr *nullfunc;
4451 struct ieee80211_sub_if_data *sdata;
4452 struct ieee80211_if_managed *ifmgd;
4453 struct ieee80211_local *local;
4454 struct sk_buff *skb;
4457 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4460 sdata = vif_to_sdata(vif);
4461 ifmgd = &sdata->u.mgd;
4462 local = sdata->local;
4465 struct sta_info *sta;
4468 sta = sta_info_get(sdata, ifmgd->bssid);
4469 qos = sta && sta->sta.wme;
4473 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4474 sizeof(*nullfunc) + 2);
4478 skb_reserve(skb, local->hw.extra_tx_headroom);
4480 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4481 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4482 IEEE80211_STYPE_NULLFUNC |
4483 IEEE80211_FCTL_TODS);
4485 __le16 qos = cpu_to_le16(7);
4487 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
4488 IEEE80211_STYPE_NULLFUNC) !=
4489 IEEE80211_STYPE_QOS_NULLFUNC);
4490 nullfunc->frame_control |=
4491 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
4493 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
4494 skb_put_data(skb, &qos, sizeof(qos));
4497 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4498 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4499 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4503 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4505 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4507 const u8 *ssid, size_t ssid_len,
4510 struct ieee80211_local *local = hw_to_local(hw);
4511 struct ieee80211_hdr_3addr *hdr;
4512 struct sk_buff *skb;
4516 ie_ssid_len = 2 + ssid_len;
4518 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4519 ie_ssid_len + tailroom);
4523 skb_reserve(skb, local->hw.extra_tx_headroom);
4525 hdr = skb_put_zero(skb, sizeof(*hdr));
4526 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4527 IEEE80211_STYPE_PROBE_REQ);
4528 eth_broadcast_addr(hdr->addr1);
4529 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4530 eth_broadcast_addr(hdr->addr3);
4532 pos = skb_put(skb, ie_ssid_len);
4533 *pos++ = WLAN_EID_SSID;
4536 memcpy(pos, ssid, ssid_len);
4541 EXPORT_SYMBOL(ieee80211_probereq_get);
4543 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4544 const void *frame, size_t frame_len,
4545 const struct ieee80211_tx_info *frame_txctl,
4546 struct ieee80211_rts *rts)
4548 const struct ieee80211_hdr *hdr = frame;
4550 rts->frame_control =
4551 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4552 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4554 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4555 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4557 EXPORT_SYMBOL(ieee80211_rts_get);
4559 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4560 const void *frame, size_t frame_len,
4561 const struct ieee80211_tx_info *frame_txctl,
4562 struct ieee80211_cts *cts)
4564 const struct ieee80211_hdr *hdr = frame;
4566 cts->frame_control =
4567 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4568 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4569 frame_len, frame_txctl);
4570 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4572 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4575 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4576 struct ieee80211_vif *vif)
4578 struct ieee80211_local *local = hw_to_local(hw);
4579 struct sk_buff *skb = NULL;
4580 struct ieee80211_tx_data tx;
4581 struct ieee80211_sub_if_data *sdata;
4583 struct ieee80211_tx_info *info;
4584 struct ieee80211_chanctx_conf *chanctx_conf;
4586 sdata = vif_to_sdata(vif);
4589 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4594 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4595 struct beacon_data *beacon =
4596 rcu_dereference(sdata->u.ap.beacon);
4598 if (!beacon || !beacon->head)
4601 ps = &sdata->u.ap.ps;
4602 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4603 ps = &sdata->u.mesh.ps;
4608 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4609 goto out; /* send buffered bc/mc only after DTIM beacon */
4612 skb = skb_dequeue(&ps->bc_buf);
4615 local->total_ps_buffered--;
4617 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4618 struct ieee80211_hdr *hdr =
4619 (struct ieee80211_hdr *) skb->data;
4620 /* more buffered multicast/broadcast frames ==> set
4621 * MoreData flag in IEEE 802.11 header to inform PS
4623 hdr->frame_control |=
4624 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4627 if (sdata->vif.type == NL80211_IFTYPE_AP)
4628 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4629 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4631 ieee80211_free_txskb(hw, skb);
4634 info = IEEE80211_SKB_CB(skb);
4636 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4637 info->band = chanctx_conf->def.chan->band;
4639 if (invoke_tx_handlers(&tx))
4646 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4648 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4650 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4651 struct ieee80211_sub_if_data *sdata = sta->sdata;
4652 struct ieee80211_local *local = sdata->local;
4656 lockdep_assert_held(&local->sta_mtx);
4658 /* only some cases are supported right now */
4659 switch (sdata->vif.type) {
4660 case NL80211_IFTYPE_STATION:
4661 case NL80211_IFTYPE_AP:
4662 case NL80211_IFTYPE_AP_VLAN:
4669 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4672 if (sta->reserved_tid == tid) {
4677 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4678 sdata_err(sdata, "TID reservation already active\n");
4683 ieee80211_stop_vif_queues(sdata->local, sdata,
4684 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4688 /* Tear down BA sessions so we stop aggregating on this TID */
4689 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4690 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4691 __ieee80211_stop_tx_ba_session(sta, tid,
4692 AGG_STOP_LOCAL_REQUEST);
4695 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4696 __ieee80211_flush_queues(local, sdata, queues, false);
4698 sta->reserved_tid = tid;
4700 ieee80211_wake_vif_queues(local, sdata,
4701 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4703 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4704 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4710 EXPORT_SYMBOL(ieee80211_reserve_tid);
4712 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4714 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4715 struct ieee80211_sub_if_data *sdata = sta->sdata;
4717 lockdep_assert_held(&sdata->local->sta_mtx);
4719 /* only some cases are supported right now */
4720 switch (sdata->vif.type) {
4721 case NL80211_IFTYPE_STATION:
4722 case NL80211_IFTYPE_AP:
4723 case NL80211_IFTYPE_AP_VLAN:
4730 if (tid != sta->reserved_tid) {
4731 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4735 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4737 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4739 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4740 struct sk_buff *skb, int tid,
4741 enum nl80211_band band)
4743 int ac = ieee80211_ac_from_tid(tid);
4745 skb_reset_mac_header(skb);
4746 skb_set_queue_mapping(skb, ac);
4747 skb->priority = tid;
4749 skb->dev = sdata->dev;
4752 * The other path calling ieee80211_xmit is from the tasklet,
4753 * and while we can handle concurrent transmissions locking
4754 * requirements are that we do not come into tx with bhs on.
4757 IEEE80211_SKB_CB(skb)->band = band;
4758 ieee80211_xmit(sdata, NULL, skb);
4762 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
4763 const u8 *buf, size_t len,
4764 const u8 *dest, __be16 proto, bool unencrypted)
4766 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4767 struct ieee80211_local *local = sdata->local;
4768 struct sk_buff *skb;
4769 struct ethhdr *ehdr;
4772 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
4773 * or Pre-Authentication
4775 if (proto != sdata->control_port_protocol &&
4776 proto != cpu_to_be16(ETH_P_PREAUTH))
4780 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT;
4784 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4785 sizeof(struct ethhdr) + len);
4789 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
4791 skb_put_data(skb, buf, len);
4793 ehdr = skb_push(skb, sizeof(struct ethhdr));
4794 memcpy(ehdr->h_dest, dest, ETH_ALEN);
4795 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
4796 ehdr->h_proto = proto;
4799 skb->protocol = htons(ETH_P_802_3);
4800 skb_reset_network_header(skb);
4801 skb_reset_mac_header(skb);
4803 __ieee80211_subif_start_xmit(skb, skb->dev, flags);