2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 * Transmit and frame generation functions.
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/bitmap.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <net/net_namespace.h>
24 #include <net/ieee80211_radiotap.h>
25 #include <net/cfg80211.h>
26 #include <net/mac80211.h>
27 #include <asm/unaligned.h>
29 #include "ieee80211_i.h"
30 #include "driver-ops.h"
40 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
41 struct sk_buff *skb, int group_addr,
44 int rate, mrate, erp, dur, i, shift = 0;
45 struct ieee80211_rate *txrate;
46 struct ieee80211_local *local = tx->local;
47 struct ieee80211_supported_band *sband;
48 struct ieee80211_hdr *hdr;
49 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
50 struct ieee80211_chanctx_conf *chanctx_conf;
54 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
56 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
57 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
61 /* assume HW handles this */
62 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
66 if (WARN_ON_ONCE(tx->rate.idx < 0))
69 sband = local->hw.wiphy->bands[info->band];
70 txrate = &sband->bitrates[tx->rate.idx];
72 erp = txrate->flags & IEEE80211_RATE_ERP_G;
75 * data and mgmt (except PS Poll):
77 * - during contention period:
78 * if addr1 is group address: 0
79 * if more fragments = 0 and addr1 is individual address: time to
80 * transmit one ACK plus SIFS
81 * if more fragments = 1 and addr1 is individual address: time to
82 * transmit next fragment plus 2 x ACK plus 3 x SIFS
85 * - control response frame (CTS or ACK) shall be transmitted using the
86 * same rate as the immediately previous frame in the frame exchange
87 * sequence, if this rate belongs to the PHY mandatory rates, or else
88 * at the highest possible rate belonging to the PHY rates in the
91 hdr = (struct ieee80211_hdr *)skb->data;
92 if (ieee80211_is_ctl(hdr->frame_control)) {
93 /* TODO: These control frames are not currently sent by
94 * mac80211, but should they be implemented, this function
95 * needs to be updated to support duration field calculation.
97 * RTS: time needed to transmit pending data/mgmt frame plus
98 * one CTS frame plus one ACK frame plus 3 x SIFS
99 * CTS: duration of immediately previous RTS minus time
100 * required to transmit CTS and its SIFS
101 * ACK: 0 if immediately previous directed data/mgmt had
102 * more=0, with more=1 duration in ACK frame is duration
103 * from previous frame minus time needed to transmit ACK
105 * PS Poll: BIT(15) | BIT(14) | aid
111 if (0 /* FIX: data/mgmt during CFP */)
112 return cpu_to_le16(32768);
114 if (group_addr) /* Group address as the destination - no ACK */
117 /* Individual destination address:
118 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
119 * CTS and ACK frames shall be transmitted using the highest rate in
120 * basic rate set that is less than or equal to the rate of the
121 * immediately previous frame and that is using the same modulation
122 * (CCK or OFDM). If no basic rate set matches with these requirements,
123 * the highest mandatory rate of the PHY that is less than or equal to
124 * the rate of the previous frame is used.
125 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
128 /* use lowest available if everything fails */
129 mrate = sband->bitrates[0].bitrate;
130 for (i = 0; i < sband->n_bitrates; i++) {
131 struct ieee80211_rate *r = &sband->bitrates[i];
133 if (r->bitrate > txrate->bitrate)
136 if ((rate_flags & r->flags) != rate_flags)
139 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
140 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
142 switch (sband->band) {
143 case IEEE80211_BAND_2GHZ: {
145 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
146 flag = IEEE80211_RATE_MANDATORY_G;
148 flag = IEEE80211_RATE_MANDATORY_B;
153 case IEEE80211_BAND_5GHZ:
154 if (r->flags & IEEE80211_RATE_MANDATORY_A)
157 case IEEE80211_BAND_60GHZ:
158 /* TODO, for now fall through */
159 case IEEE80211_NUM_BANDS:
165 /* No matching basic rate found; use highest suitable mandatory
167 rate = DIV_ROUND_UP(mrate, 1 << shift);
170 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
171 if (ieee80211_is_data_qos(hdr->frame_control) &&
172 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
175 /* Time needed to transmit ACK
176 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
177 * to closest integer */
178 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
179 tx->sdata->vif.bss_conf.use_short_preamble,
183 /* Frame is fragmented: duration increases with time needed to
184 * transmit next fragment plus ACK and 2 x SIFS. */
185 dur *= 2; /* ACK + SIFS */
187 dur += ieee80211_frame_duration(sband->band, next_frag_len,
188 txrate->bitrate, erp,
189 tx->sdata->vif.bss_conf.use_short_preamble,
193 return cpu_to_le16(dur);
197 static ieee80211_tx_result debug_noinline
198 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
200 struct ieee80211_local *local = tx->local;
201 struct ieee80211_if_managed *ifmgd;
203 /* driver doesn't support power save */
204 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
207 /* hardware does dynamic power save */
208 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
211 /* dynamic power save disabled */
212 if (local->hw.conf.dynamic_ps_timeout <= 0)
215 /* we are scanning, don't enable power save */
219 if (!local->ps_sdata)
222 /* No point if we're going to suspend */
223 if (local->quiescing)
226 /* dynamic ps is supported only in managed mode */
227 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
230 ifmgd = &tx->sdata->u.mgd;
233 * Don't wakeup from power save if u-apsd is enabled, voip ac has
234 * u-apsd enabled and the frame is in voip class. This effectively
235 * means that even if all access categories have u-apsd enabled, in
236 * practise u-apsd is only used with the voip ac. This is a
237 * workaround for the case when received voip class packets do not
238 * have correct qos tag for some reason, due the network or the
241 * Note: ifmgd->uapsd_queues access is racy here. If the value is
242 * changed via debugfs, user needs to reassociate manually to have
243 * everything in sync.
245 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
246 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
247 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
250 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
251 ieee80211_stop_queues_by_reason(&local->hw,
252 IEEE80211_MAX_QUEUE_MAP,
253 IEEE80211_QUEUE_STOP_REASON_PS,
255 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
256 ieee80211_queue_work(&local->hw,
257 &local->dynamic_ps_disable_work);
260 /* Don't restart the timer if we're not disassociated */
261 if (!ifmgd->associated)
264 mod_timer(&local->dynamic_ps_timer, jiffies +
265 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
270 static ieee80211_tx_result debug_noinline
271 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
274 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
275 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
278 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
281 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
282 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
283 !ieee80211_is_probe_req(hdr->frame_control) &&
284 !ieee80211_is_nullfunc(hdr->frame_control))
286 * When software scanning only nullfunc frames (to notify
287 * the sleep state to the AP) and probe requests (for the
288 * active scan) are allowed, all other frames should not be
289 * sent and we should not get here, but if we do
290 * nonetheless, drop them to avoid sending them
291 * off-channel. See the link below and
292 * ieee80211_start_scan() for more.
294 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
298 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
301 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
304 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
307 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
311 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
313 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
314 if (unlikely(!assoc &&
315 ieee80211_is_data(hdr->frame_control))) {
316 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
317 sdata_info(tx->sdata,
318 "dropped data frame to not associated station %pM\n",
321 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
324 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
325 ieee80211_is_data(hdr->frame_control) &&
326 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
328 * No associated STAs - no need to send multicast
337 /* This function is called whenever the AP is about to exceed the maximum limit
338 * of buffered frames for power saving STAs. This situation should not really
339 * happen often during normal operation, so dropping the oldest buffered packet
340 * from each queue should be OK to make some room for new frames. */
341 static void purge_old_ps_buffers(struct ieee80211_local *local)
343 int total = 0, purged = 0;
345 struct ieee80211_sub_if_data *sdata;
346 struct sta_info *sta;
348 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
351 if (sdata->vif.type == NL80211_IFTYPE_AP)
352 ps = &sdata->u.ap.ps;
353 else if (ieee80211_vif_is_mesh(&sdata->vif))
354 ps = &sdata->u.mesh.ps;
358 skb = skb_dequeue(&ps->bc_buf);
363 total += skb_queue_len(&ps->bc_buf);
367 * Drop one frame from each station from the lowest-priority
368 * AC that has frames at all.
370 list_for_each_entry_rcu(sta, &local->sta_list, list) {
373 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
374 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
375 total += skb_queue_len(&sta->ps_tx_buf[ac]);
378 ieee80211_free_txskb(&local->hw, skb);
384 local->total_ps_buffered = total;
385 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
388 static ieee80211_tx_result
389 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
391 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
392 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
396 * broadcast/multicast frame
398 * If any of the associated/peer stations is in power save mode,
399 * the frame is buffered to be sent after DTIM beacon frame.
400 * This is done either by the hardware or us.
403 /* powersaving STAs currently only in AP/VLAN/mesh mode */
404 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
405 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
409 ps = &tx->sdata->bss->ps;
410 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
411 ps = &tx->sdata->u.mesh.ps;
417 /* no buffering for ordered frames */
418 if (ieee80211_has_order(hdr->frame_control))
421 if (ieee80211_is_probe_req(hdr->frame_control))
424 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
425 info->hw_queue = tx->sdata->vif.cab_queue;
427 /* no stations in PS mode */
428 if (!atomic_read(&ps->num_sta_ps))
431 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
433 /* device releases frame after DTIM beacon */
434 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
437 /* buffered in mac80211 */
438 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
439 purge_old_ps_buffers(tx->local);
441 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
443 "BC TX buffer full - dropping the oldest frame\n");
444 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
446 tx->local->total_ps_buffered++;
448 skb_queue_tail(&ps->bc_buf, tx->skb);
453 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
456 if (!ieee80211_is_mgmt(fc))
459 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
462 if (!ieee80211_is_robust_mgmt_frame(skb))
468 static ieee80211_tx_result
469 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
471 struct sta_info *sta = tx->sta;
472 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
473 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
474 struct ieee80211_local *local = tx->local;
479 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
480 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
481 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
482 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
483 int ac = skb_get_queue_mapping(tx->skb);
485 if (ieee80211_is_mgmt(hdr->frame_control) &&
486 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
487 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
491 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
492 sta->sta.addr, sta->sta.aid, ac);
493 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
494 purge_old_ps_buffers(tx->local);
496 /* sync with ieee80211_sta_ps_deliver_wakeup */
497 spin_lock(&sta->ps_lock);
499 * STA woke up the meantime and all the frames on ps_tx_buf have
500 * been queued to pending queue. No reordering can happen, go
501 * ahead and Tx the packet.
503 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
504 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
505 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
506 spin_unlock(&sta->ps_lock);
510 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
511 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
513 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
515 ieee80211_free_txskb(&local->hw, old);
517 tx->local->total_ps_buffered++;
519 info->control.jiffies = jiffies;
520 info->control.vif = &tx->sdata->vif;
521 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
522 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
523 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
524 spin_unlock(&sta->ps_lock);
526 if (!timer_pending(&local->sta_cleanup))
527 mod_timer(&local->sta_cleanup,
528 round_jiffies(jiffies +
529 STA_INFO_CLEANUP_INTERVAL));
532 * We queued up some frames, so the TIM bit might
533 * need to be set, recalculate it.
535 sta_info_recalc_tim(sta);
538 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
540 "STA %pM in PS mode, but polling/in SP -> send frame\n",
547 static ieee80211_tx_result debug_noinline
548 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
550 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
553 if (tx->flags & IEEE80211_TX_UNICAST)
554 return ieee80211_tx_h_unicast_ps_buf(tx);
556 return ieee80211_tx_h_multicast_ps_buf(tx);
559 static ieee80211_tx_result debug_noinline
560 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
562 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
564 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
565 if (tx->sdata->control_port_no_encrypt)
566 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
567 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
568 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
574 static ieee80211_tx_result debug_noinline
575 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
577 struct ieee80211_key *key;
578 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
579 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
581 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
584 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
586 else if (ieee80211_is_mgmt(hdr->frame_control) &&
587 is_multicast_ether_addr(hdr->addr1) &&
588 ieee80211_is_robust_mgmt_frame(tx->skb) &&
589 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
591 else if (is_multicast_ether_addr(hdr->addr1) &&
592 (key = rcu_dereference(tx->sdata->default_multicast_key)))
594 else if (!is_multicast_ether_addr(hdr->addr1) &&
595 (key = rcu_dereference(tx->sdata->default_unicast_key)))
601 bool skip_hw = false;
603 tx->key->tx_rx_count++;
604 /* TODO: add threshold stuff again */
606 switch (tx->key->conf.cipher) {
607 case WLAN_CIPHER_SUITE_WEP40:
608 case WLAN_CIPHER_SUITE_WEP104:
609 case WLAN_CIPHER_SUITE_TKIP:
610 if (!ieee80211_is_data_present(hdr->frame_control))
613 case WLAN_CIPHER_SUITE_CCMP:
614 case WLAN_CIPHER_SUITE_CCMP_256:
615 case WLAN_CIPHER_SUITE_GCMP:
616 case WLAN_CIPHER_SUITE_GCMP_256:
617 if (!ieee80211_is_data_present(hdr->frame_control) &&
618 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
622 skip_hw = (tx->key->conf.flags &
623 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
624 ieee80211_is_mgmt(hdr->frame_control);
626 case WLAN_CIPHER_SUITE_AES_CMAC:
627 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
628 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
629 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
630 if (!ieee80211_is_mgmt(hdr->frame_control))
635 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
636 !ieee80211_is_deauth(hdr->frame_control)))
639 if (!skip_hw && tx->key &&
640 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
641 info->control.hw_key = &tx->key->conf;
647 static ieee80211_tx_result debug_noinline
648 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
650 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
651 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
652 struct ieee80211_supported_band *sband;
654 struct ieee80211_tx_rate_control txrc;
655 struct ieee80211_sta_rates *ratetbl = NULL;
658 memset(&txrc, 0, sizeof(txrc));
660 sband = tx->local->hw.wiphy->bands[info->band];
662 len = min_t(u32, tx->skb->len + FCS_LEN,
663 tx->local->hw.wiphy->frag_threshold);
665 /* set up the tx rate control struct we give the RC algo */
666 txrc.hw = &tx->local->hw;
668 txrc.bss_conf = &tx->sdata->vif.bss_conf;
670 txrc.reported_rate.idx = -1;
671 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
672 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
673 txrc.max_rate_idx = -1;
675 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
677 if (tx->sdata->rc_has_mcs_mask[info->band])
678 txrc.rate_idx_mcs_mask =
679 tx->sdata->rc_rateidx_mcs_mask[info->band];
681 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
682 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
683 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
685 /* set up RTS protection if desired */
686 if (len > tx->local->hw.wiphy->rts_threshold) {
690 info->control.use_rts = txrc.rts;
691 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
694 * Use short preamble if the BSS can handle it, but not for
695 * management frames unless we know the receiver can handle
696 * that -- the management frame might be to a station that
697 * just wants a probe response.
699 if (tx->sdata->vif.bss_conf.use_short_preamble &&
700 (ieee80211_is_data(hdr->frame_control) ||
701 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
702 txrc.short_preamble = true;
704 info->control.short_preamble = txrc.short_preamble;
707 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
710 * Lets not bother rate control if we're associated and cannot
711 * talk to the sta. This should not happen.
713 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
714 !rate_usable_index_exists(sband, &tx->sta->sta),
715 "%s: Dropped data frame as no usable bitrate found while "
716 "scanning and associated. Target station: "
717 "%pM on %d GHz band\n",
718 tx->sdata->name, hdr->addr1,
723 * If we're associated with the sta at this point we know we can at
724 * least send the frame at the lowest bit rate.
726 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
728 if (tx->sta && !info->control.skip_table)
729 ratetbl = rcu_dereference(tx->sta->sta.rates);
731 if (unlikely(info->control.rates[0].idx < 0)) {
733 struct ieee80211_tx_rate rate = {
734 .idx = ratetbl->rate[0].idx,
735 .flags = ratetbl->rate[0].flags,
736 .count = ratetbl->rate[0].count
739 if (ratetbl->rate[0].idx < 0)
747 tx->rate = info->control.rates[0];
750 if (txrc.reported_rate.idx < 0) {
751 txrc.reported_rate = tx->rate;
752 if (tx->sta && ieee80211_is_data(hdr->frame_control))
753 tx->sta->last_tx_rate = txrc.reported_rate;
755 tx->sta->last_tx_rate = txrc.reported_rate;
760 if (unlikely(!info->control.rates[0].count))
761 info->control.rates[0].count = 1;
763 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
764 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
765 info->control.rates[0].count = 1;
770 static ieee80211_tx_result debug_noinline
771 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
773 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
774 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
780 * Packet injection may want to control the sequence
781 * number, if we have no matching interface then we
782 * neither assign one ourselves nor ask the driver to.
784 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
787 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
790 if (ieee80211_hdrlen(hdr->frame_control) < 24)
793 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
797 * Anything but QoS data that has a sequence number field
798 * (is long enough) gets a sequence number from the global
799 * counter. QoS data frames with a multicast destination
800 * also use the global counter (802.11-2012 9.3.2.10).
802 if (!ieee80211_is_data_qos(hdr->frame_control) ||
803 is_multicast_ether_addr(hdr->addr1)) {
804 /* driver should assign sequence number */
805 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
806 /* for pure STA mode without beacons, we can do it */
807 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
808 tx->sdata->sequence_number += 0x10;
810 tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++;
815 * This should be true for injected/management frames only, for
816 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
817 * above since they are not QoS-data frames.
822 /* include per-STA, per-TID sequence counter */
824 qc = ieee80211_get_qos_ctl(hdr);
825 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
826 seq = &tx->sta->tid_seq[tid];
827 tx->sta->tx_msdu[tid]++;
829 hdr->seq_ctrl = cpu_to_le16(*seq);
831 /* Increase the sequence number. */
832 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
837 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
838 struct sk_buff *skb, int hdrlen,
841 struct ieee80211_local *local = tx->local;
842 struct ieee80211_tx_info *info;
844 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
845 int pos = hdrlen + per_fragm;
846 int rem = skb->len - hdrlen - per_fragm;
848 if (WARN_ON(rem < 0))
851 /* first fragment was already added to queue by caller */
854 int fraglen = per_fragm;
859 tmp = dev_alloc_skb(local->tx_headroom +
861 tx->sdata->encrypt_headroom +
862 IEEE80211_ENCRYPT_TAILROOM);
866 __skb_queue_tail(&tx->skbs, tmp);
869 local->tx_headroom + tx->sdata->encrypt_headroom);
871 /* copy control information */
872 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
874 info = IEEE80211_SKB_CB(tmp);
875 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
876 IEEE80211_TX_CTL_FIRST_FRAGMENT);
879 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
881 skb_copy_queue_mapping(tmp, skb);
882 tmp->priority = skb->priority;
885 /* copy header and data */
886 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
887 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
892 /* adjust first fragment's length */
893 skb_trim(skb, hdrlen + per_fragm);
897 static ieee80211_tx_result debug_noinline
898 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
900 struct sk_buff *skb = tx->skb;
901 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
902 struct ieee80211_hdr *hdr = (void *)skb->data;
903 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
907 /* no matter what happens, tx->skb moves to tx->skbs */
908 __skb_queue_tail(&tx->skbs, skb);
911 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
914 if (tx->local->ops->set_frag_threshold)
918 * Warn when submitting a fragmented A-MPDU frame and drop it.
919 * This scenario is handled in ieee80211_tx_prepare but extra
920 * caution taken here as fragmented ampdu may cause Tx stop.
922 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
925 hdrlen = ieee80211_hdrlen(hdr->frame_control);
927 /* internal error, why isn't DONTFRAG set? */
928 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
932 * Now fragment the frame. This will allocate all the fragments and
933 * chain them (using skb as the first fragment) to skb->next.
934 * During transmission, we will remove the successfully transmitted
935 * fragments from this list. When the low-level driver rejects one
936 * of the fragments then we will simply pretend to accept the skb
937 * but store it away as pending.
939 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
942 /* update duration/seq/flags of fragments */
945 skb_queue_walk(&tx->skbs, skb) {
946 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
948 hdr = (void *)skb->data;
949 info = IEEE80211_SKB_CB(skb);
951 if (!skb_queue_is_last(&tx->skbs, skb)) {
952 hdr->frame_control |= morefrags;
954 * No multi-rate retries for fragmented frames, that
955 * would completely throw off the NAV at other STAs.
957 info->control.rates[1].idx = -1;
958 info->control.rates[2].idx = -1;
959 info->control.rates[3].idx = -1;
960 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
961 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
963 hdr->frame_control &= ~morefrags;
965 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
972 static ieee80211_tx_result debug_noinline
973 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
981 skb_queue_walk(&tx->skbs, skb) {
982 ac = skb_get_queue_mapping(skb);
983 tx->sta->tx_fragments++;
984 tx->sta->tx_bytes[ac] += skb->len;
987 tx->sta->tx_packets[ac]++;
992 static ieee80211_tx_result debug_noinline
993 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
998 switch (tx->key->conf.cipher) {
999 case WLAN_CIPHER_SUITE_WEP40:
1000 case WLAN_CIPHER_SUITE_WEP104:
1001 return ieee80211_crypto_wep_encrypt(tx);
1002 case WLAN_CIPHER_SUITE_TKIP:
1003 return ieee80211_crypto_tkip_encrypt(tx);
1004 case WLAN_CIPHER_SUITE_CCMP:
1005 return ieee80211_crypto_ccmp_encrypt(
1006 tx, IEEE80211_CCMP_MIC_LEN);
1007 case WLAN_CIPHER_SUITE_CCMP_256:
1008 return ieee80211_crypto_ccmp_encrypt(
1009 tx, IEEE80211_CCMP_256_MIC_LEN);
1010 case WLAN_CIPHER_SUITE_AES_CMAC:
1011 return ieee80211_crypto_aes_cmac_encrypt(tx);
1012 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1013 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1014 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1015 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1016 return ieee80211_crypto_aes_gmac_encrypt(tx);
1017 case WLAN_CIPHER_SUITE_GCMP:
1018 case WLAN_CIPHER_SUITE_GCMP_256:
1019 return ieee80211_crypto_gcmp_encrypt(tx);
1021 return ieee80211_crypto_hw_encrypt(tx);
1027 static ieee80211_tx_result debug_noinline
1028 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1030 struct sk_buff *skb;
1031 struct ieee80211_hdr *hdr;
1035 skb_queue_walk(&tx->skbs, skb) {
1036 hdr = (void *) skb->data;
1037 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1038 break; /* must not overwrite AID */
1039 if (!skb_queue_is_last(&tx->skbs, skb)) {
1040 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1041 next_len = next->len;
1044 group_addr = is_multicast_ether_addr(hdr->addr1);
1047 ieee80211_duration(tx, skb, group_addr, next_len);
1053 /* actual transmit path */
1055 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1056 struct sk_buff *skb,
1057 struct ieee80211_tx_info *info,
1058 struct tid_ampdu_tx *tid_tx,
1061 bool queued = false;
1062 bool reset_agg_timer = false;
1063 struct sk_buff *purge_skb = NULL;
1065 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1066 info->flags |= IEEE80211_TX_CTL_AMPDU;
1067 reset_agg_timer = true;
1068 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1070 * nothing -- this aggregation session is being started
1071 * but that might still fail with the driver
1074 spin_lock(&tx->sta->lock);
1076 * Need to re-check now, because we may get here
1078 * 1) in the window during which the setup is actually
1079 * already done, but not marked yet because not all
1080 * packets are spliced over to the driver pending
1081 * queue yet -- if this happened we acquire the lock
1082 * either before or after the splice happens, but
1083 * need to recheck which of these cases happened.
1085 * 2) during session teardown, if the OPERATIONAL bit
1086 * was cleared due to the teardown but the pointer
1087 * hasn't been assigned NULL yet (or we loaded it
1088 * before it was assigned) -- in this case it may
1089 * now be NULL which means we should just let the
1090 * packet pass through because splicing the frames
1091 * back is already done.
1093 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1096 /* do nothing, let packet pass through */
1097 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1098 info->flags |= IEEE80211_TX_CTL_AMPDU;
1099 reset_agg_timer = true;
1102 info->control.vif = &tx->sdata->vif;
1103 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1104 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1105 __skb_queue_tail(&tid_tx->pending, skb);
1106 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1107 purge_skb = __skb_dequeue(&tid_tx->pending);
1109 spin_unlock(&tx->sta->lock);
1112 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1115 /* reset session timer */
1116 if (reset_agg_timer && tid_tx->timeout)
1117 tid_tx->last_tx = jiffies;
1124 * pass %NULL for the station if unknown, a valid pointer if known
1125 * or an ERR_PTR() if the station is known not to exist
1127 static ieee80211_tx_result
1128 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1129 struct ieee80211_tx_data *tx,
1130 struct sta_info *sta, struct sk_buff *skb)
1132 struct ieee80211_local *local = sdata->local;
1133 struct ieee80211_hdr *hdr;
1134 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1138 memset(tx, 0, sizeof(*tx));
1142 __skb_queue_head_init(&tx->skbs);
1145 * If this flag is set to true anywhere, and we get here,
1146 * we are doing the needed processing, so remove the flag
1149 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1151 hdr = (struct ieee80211_hdr *) skb->data;
1157 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1158 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1159 if (!tx->sta && sdata->wdev.use_4addr)
1161 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1162 IEEE80211_TX_CTL_INJECTED) ||
1163 tx->sdata->control_port_protocol == tx->skb->protocol) {
1164 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1166 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1167 tx->sta = sta_info_get(sdata, hdr->addr1);
1170 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1171 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1172 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1173 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1174 struct tid_ampdu_tx *tid_tx;
1176 qc = ieee80211_get_qos_ctl(hdr);
1177 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1179 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1183 queued = ieee80211_tx_prep_agg(tx, skb, info,
1186 if (unlikely(queued))
1191 if (is_multicast_ether_addr(hdr->addr1)) {
1192 tx->flags &= ~IEEE80211_TX_UNICAST;
1193 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1195 tx->flags |= IEEE80211_TX_UNICAST;
1197 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1198 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1199 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1200 info->flags & IEEE80211_TX_CTL_AMPDU)
1201 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1205 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1206 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1207 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1209 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1214 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1215 struct ieee80211_vif *vif,
1216 struct ieee80211_sta *sta,
1217 struct sk_buff_head *skbs,
1220 struct ieee80211_tx_control control;
1221 struct sk_buff *skb, *tmp;
1222 unsigned long flags;
1224 skb_queue_walk_safe(skbs, skb, tmp) {
1225 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1226 int q = info->hw_queue;
1228 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1229 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1230 __skb_unlink(skb, skbs);
1231 ieee80211_free_txskb(&local->hw, skb);
1236 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1237 if (local->queue_stop_reasons[q] ||
1238 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1239 if (unlikely(info->flags &
1240 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1241 if (local->queue_stop_reasons[q] &
1242 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1244 * Drop off-channel frames if queues
1245 * are stopped for any reason other
1246 * than off-channel operation. Never
1249 spin_unlock_irqrestore(
1250 &local->queue_stop_reason_lock,
1252 ieee80211_purge_tx_queue(&local->hw,
1259 * Since queue is stopped, queue up frames for
1260 * later transmission from the tx-pending
1261 * tasklet when the queue is woken again.
1264 skb_queue_splice_init(skbs,
1265 &local->pending[q]);
1267 skb_queue_splice_tail_init(skbs,
1268 &local->pending[q]);
1270 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1275 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1277 info->control.vif = vif;
1280 __skb_unlink(skb, skbs);
1281 drv_tx(local, &control, skb);
1288 * Returns false if the frame couldn't be transmitted but was queued instead.
1290 static bool __ieee80211_tx(struct ieee80211_local *local,
1291 struct sk_buff_head *skbs, int led_len,
1292 struct sta_info *sta, bool txpending)
1294 struct ieee80211_tx_info *info;
1295 struct ieee80211_sub_if_data *sdata;
1296 struct ieee80211_vif *vif;
1297 struct ieee80211_sta *pubsta;
1298 struct sk_buff *skb;
1302 if (WARN_ON(skb_queue_empty(skbs)))
1305 skb = skb_peek(skbs);
1306 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1307 info = IEEE80211_SKB_CB(skb);
1308 sdata = vif_to_sdata(info->control.vif);
1309 if (sta && !sta->uploaded)
1317 switch (sdata->vif.type) {
1318 case NL80211_IFTYPE_MONITOR:
1319 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1323 sdata = rcu_dereference(local->monitor_sdata);
1327 vif->hw_queue[skb_get_queue_mapping(skb)];
1328 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1334 case NL80211_IFTYPE_AP_VLAN:
1335 sdata = container_of(sdata->bss,
1336 struct ieee80211_sub_if_data, u.ap);
1343 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1346 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1348 WARN_ON_ONCE(!skb_queue_empty(skbs));
1354 * Invoke TX handlers, return 0 on success and non-zero if the
1355 * frame was dropped or queued.
1357 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1359 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1360 ieee80211_tx_result res = TX_DROP;
1362 #define CALL_TXH(txh) \
1365 if (res != TX_CONTINUE) \
1369 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1370 CALL_TXH(ieee80211_tx_h_check_assoc);
1371 CALL_TXH(ieee80211_tx_h_ps_buf);
1372 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1373 CALL_TXH(ieee80211_tx_h_select_key);
1374 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1375 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1377 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1378 __skb_queue_tail(&tx->skbs, tx->skb);
1383 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1384 CALL_TXH(ieee80211_tx_h_sequence);
1385 CALL_TXH(ieee80211_tx_h_fragment);
1386 /* handlers after fragment must be aware of tx info fragmentation! */
1387 CALL_TXH(ieee80211_tx_h_stats);
1388 CALL_TXH(ieee80211_tx_h_encrypt);
1389 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1390 CALL_TXH(ieee80211_tx_h_calculate_duration);
1394 if (unlikely(res == TX_DROP)) {
1395 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1397 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1399 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1401 } else if (unlikely(res == TX_QUEUED)) {
1402 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1409 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1410 struct ieee80211_vif *vif, struct sk_buff *skb,
1411 int band, struct ieee80211_sta **sta)
1413 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1414 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1415 struct ieee80211_tx_data tx;
1416 struct sk_buff *skb2;
1418 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1422 info->control.vif = vif;
1423 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1425 if (invoke_tx_handlers(&tx))
1430 *sta = &tx.sta->sta;
1435 /* this function isn't suitable for fragmented data frames */
1436 skb2 = __skb_dequeue(&tx.skbs);
1437 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1438 ieee80211_free_txskb(hw, skb2);
1439 ieee80211_purge_tx_queue(hw, &tx.skbs);
1445 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1448 * Returns false if the frame couldn't be transmitted but was queued instead.
1450 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1451 struct sta_info *sta, struct sk_buff *skb,
1454 struct ieee80211_local *local = sdata->local;
1455 struct ieee80211_tx_data tx;
1456 ieee80211_tx_result res_prepare;
1457 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1461 if (unlikely(skb->len < 10)) {
1466 /* initialises tx */
1468 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1470 if (unlikely(res_prepare == TX_DROP)) {
1471 ieee80211_free_txskb(&local->hw, skb);
1473 } else if (unlikely(res_prepare == TX_QUEUED)) {
1477 /* set up hw_queue value early */
1478 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1479 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1481 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1483 if (!invoke_tx_handlers(&tx))
1484 result = __ieee80211_tx(local, &tx.skbs, led_len,
1490 /* device xmit handlers */
1492 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1493 struct sk_buff *skb,
1494 int head_need, bool may_encrypt)
1496 struct ieee80211_local *local = sdata->local;
1499 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1500 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1501 tail_need -= skb_tailroom(skb);
1502 tail_need = max_t(int, tail_need, 0);
1505 if (skb_cloned(skb) &&
1506 (!(local->hw.flags & IEEE80211_HW_SUPPORTS_CLONED_SKBS) ||
1507 !skb_clone_writable(skb, ETH_HLEN) ||
1508 sdata->crypto_tx_tailroom_needed_cnt))
1509 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1510 else if (head_need || tail_need)
1511 I802_DEBUG_INC(local->tx_expand_skb_head);
1515 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1516 wiphy_debug(local->hw.wiphy,
1517 "failed to reallocate TX buffer\n");
1524 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1525 struct sta_info *sta, struct sk_buff *skb)
1527 struct ieee80211_local *local = sdata->local;
1528 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1529 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1533 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1535 headroom = local->tx_headroom;
1537 headroom += sdata->encrypt_headroom;
1538 headroom -= skb_headroom(skb);
1539 headroom = max_t(int, 0, headroom);
1541 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1542 ieee80211_free_txskb(&local->hw, skb);
1546 hdr = (struct ieee80211_hdr *) skb->data;
1547 info->control.vif = &sdata->vif;
1549 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1550 if (ieee80211_is_data(hdr->frame_control) &&
1551 is_unicast_ether_addr(hdr->addr1)) {
1552 if (mesh_nexthop_resolve(sdata, skb))
1553 return; /* skb queued: don't free */
1555 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1559 ieee80211_set_qos_hdr(sdata, skb);
1560 ieee80211_tx(sdata, sta, skb, false);
1563 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1565 struct ieee80211_radiotap_iterator iterator;
1566 struct ieee80211_radiotap_header *rthdr =
1567 (struct ieee80211_radiotap_header *) skb->data;
1568 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1569 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1573 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1574 IEEE80211_TX_CTL_DONTFRAG;
1577 * for every radiotap entry that is present
1578 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1579 * entries present, or -EINVAL on error)
1583 ret = ieee80211_radiotap_iterator_next(&iterator);
1588 /* see if this argument is something we can use */
1589 switch (iterator.this_arg_index) {
1591 * You must take care when dereferencing iterator.this_arg
1592 * for multibyte types... the pointer is not aligned. Use
1593 * get_unaligned((type *)iterator.this_arg) to dereference
1594 * iterator.this_arg for type "type" safely on all arches.
1596 case IEEE80211_RADIOTAP_FLAGS:
1597 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1599 * this indicates that the skb we have been
1600 * handed has the 32-bit FCS CRC at the end...
1601 * we should react to that by snipping it off
1602 * because it will be recomputed and added
1605 if (skb->len < (iterator._max_length + FCS_LEN))
1608 skb_trim(skb, skb->len - FCS_LEN);
1610 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1611 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1612 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1613 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1616 case IEEE80211_RADIOTAP_TX_FLAGS:
1617 txflags = get_unaligned_le16(iterator.this_arg);
1618 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1619 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1623 * Please update the file
1624 * Documentation/networking/mac80211-injection.txt
1625 * when parsing new fields here.
1633 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1637 * remove the radiotap header
1638 * iterator->_max_length was sanity-checked against
1639 * skb->len by iterator init
1641 skb_pull(skb, iterator._max_length);
1646 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1647 struct net_device *dev)
1649 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1650 struct ieee80211_chanctx_conf *chanctx_conf;
1651 struct ieee80211_radiotap_header *prthdr =
1652 (struct ieee80211_radiotap_header *)skb->data;
1653 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1654 struct ieee80211_hdr *hdr;
1655 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1656 struct cfg80211_chan_def *chandef;
1660 /* check for not even having the fixed radiotap header part */
1661 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1662 goto fail; /* too short to be possibly valid */
1664 /* is it a header version we can trust to find length from? */
1665 if (unlikely(prthdr->it_version))
1666 goto fail; /* only version 0 is supported */
1668 /* then there must be a radiotap header with a length we can use */
1669 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1671 /* does the skb contain enough to deliver on the alleged length? */
1672 if (unlikely(skb->len < len_rthdr))
1673 goto fail; /* skb too short for claimed rt header extent */
1676 * fix up the pointers accounting for the radiotap
1677 * header still being in there. We are being given
1678 * a precooked IEEE80211 header so no need for
1681 skb_set_mac_header(skb, len_rthdr);
1683 * these are just fixed to the end of the rt area since we
1684 * don't have any better information and at this point, nobody cares
1686 skb_set_network_header(skb, len_rthdr);
1687 skb_set_transport_header(skb, len_rthdr);
1689 if (skb->len < len_rthdr + 2)
1692 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1693 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1695 if (skb->len < len_rthdr + hdrlen)
1699 * Initialize skb->protocol if the injected frame is a data frame
1700 * carrying a rfc1042 header
1702 if (ieee80211_is_data(hdr->frame_control) &&
1703 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1704 u8 *payload = (u8 *)hdr + hdrlen;
1706 if (ether_addr_equal(payload, rfc1042_header))
1707 skb->protocol = cpu_to_be16((payload[6] << 8) |
1711 memset(info, 0, sizeof(*info));
1713 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1714 IEEE80211_TX_CTL_INJECTED;
1716 /* process and remove the injection radiotap header */
1717 if (!ieee80211_parse_tx_radiotap(skb))
1723 * We process outgoing injected frames that have a local address
1724 * we handle as though they are non-injected frames.
1725 * This code here isn't entirely correct, the local MAC address
1726 * isn't always enough to find the interface to use; for proper
1727 * VLAN/WDS support we will need a different mechanism (which
1728 * likely isn't going to be monitor interfaces).
1730 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1732 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1733 if (!ieee80211_sdata_running(tmp_sdata))
1735 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1736 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1737 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1739 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1745 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1746 if (!chanctx_conf) {
1747 tmp_sdata = rcu_dereference(local->monitor_sdata);
1750 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1754 chandef = &chanctx_conf->def;
1755 else if (!local->use_chanctx)
1756 chandef = &local->_oper_chandef;
1761 * Frame injection is not allowed if beaconing is not allowed
1762 * or if we need radar detection. Beaconing is usually not allowed when
1763 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1764 * Passive scan is also used in world regulatory domains where
1765 * your country is not known and as such it should be treated as
1766 * NO TX unless the channel is explicitly allowed in which case
1767 * your current regulatory domain would not have the passive scan
1770 * Since AP mode uses monitor interfaces to inject/TX management
1771 * frames we can make AP mode the exception to this rule once it
1772 * supports radar detection as its implementation can deal with
1773 * radar detection by itself. We can do that later by adding a
1774 * monitor flag interfaces used for AP support.
1776 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1780 info->band = chandef->chan->band;
1781 ieee80211_xmit(sdata, NULL, skb);
1784 return NETDEV_TX_OK;
1790 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1793 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
1795 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
1797 return ethertype == ETH_P_TDLS &&
1799 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1802 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
1803 struct sk_buff *skb,
1804 struct sta_info **sta_out)
1806 struct sta_info *sta;
1808 switch (sdata->vif.type) {
1809 case NL80211_IFTYPE_AP_VLAN:
1810 sta = rcu_dereference(sdata->u.vlan.sta);
1814 } else if (sdata->wdev.use_4addr) {
1818 case NL80211_IFTYPE_AP:
1819 case NL80211_IFTYPE_OCB:
1820 case NL80211_IFTYPE_ADHOC:
1821 if (is_multicast_ether_addr(skb->data)) {
1822 *sta_out = ERR_PTR(-ENOENT);
1825 sta = sta_info_get_bss(sdata, skb->data);
1827 case NL80211_IFTYPE_WDS:
1828 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
1830 #ifdef CONFIG_MAC80211_MESH
1831 case NL80211_IFTYPE_MESH_POINT:
1832 /* determined much later */
1836 case NL80211_IFTYPE_STATION:
1837 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1838 sta = sta_info_get(sdata, skb->data);
1840 bool tdls_peer, tdls_auth;
1842 tdls_peer = test_sta_flag(sta,
1843 WLAN_STA_TDLS_PEER);
1844 tdls_auth = test_sta_flag(sta,
1845 WLAN_STA_TDLS_PEER_AUTH);
1847 if (tdls_peer && tdls_auth) {
1853 * TDLS link during setup - throw out frames to
1854 * peer. Allow TDLS-setup frames to unauthorized
1855 * peers for the special case of a link teardown
1856 * after a TDLS sta is removed due to being
1859 if (tdls_peer && !tdls_auth &&
1860 !ieee80211_is_tdls_setup(skb))
1866 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
1874 *sta_out = sta ?: ERR_PTR(-ENOENT);
1879 * ieee80211_build_hdr - build 802.11 header in the given frame
1880 * @sdata: virtual interface to build the header for
1881 * @skb: the skb to build the header in
1882 * @info_flags: skb flags to set
1884 * This function takes the skb with 802.3 header and reformats the header to
1885 * the appropriate IEEE 802.11 header based on which interface the packet is
1886 * being transmitted on.
1888 * Note that this function also takes care of the TX status request and
1889 * potential unsharing of the SKB - this needs to be interleaved with the
1892 * The function requires the read-side RCU lock held
1894 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1896 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
1897 struct sk_buff *skb, u32 info_flags,
1898 struct sta_info *sta)
1900 struct ieee80211_local *local = sdata->local;
1901 struct ieee80211_tx_info *info;
1903 u16 ethertype, hdrlen, meshhdrlen = 0;
1905 struct ieee80211_hdr hdr;
1906 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1907 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1908 const u8 *encaps_data;
1909 int encaps_len, skip_header_bytes;
1911 bool wme_sta = false, authorized = false;
1915 struct ieee80211_chanctx_conf *chanctx_conf;
1916 struct ieee80211_sub_if_data *ap_sdata;
1917 enum ieee80211_band band;
1923 /* convert Ethernet header to proper 802.11 header (based on
1924 * operation mode) */
1925 ethertype = (skb->data[12] << 8) | skb->data[13];
1926 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1928 switch (sdata->vif.type) {
1929 case NL80211_IFTYPE_AP_VLAN:
1930 if (sdata->wdev.use_4addr) {
1931 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1933 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1934 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1935 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1936 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1938 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1939 wme_sta = sta->sta.wme;
1941 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1943 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1944 if (!chanctx_conf) {
1948 band = chanctx_conf->def.chan->band;
1949 if (sdata->wdev.use_4addr)
1952 case NL80211_IFTYPE_AP:
1953 if (sdata->vif.type == NL80211_IFTYPE_AP)
1954 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1955 if (!chanctx_conf) {
1959 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1961 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1962 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1963 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1965 band = chanctx_conf->def.chan->band;
1967 case NL80211_IFTYPE_WDS:
1968 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1970 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1971 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1972 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1973 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1976 * This is the exception! WDS style interfaces are prohibited
1977 * when channel contexts are in used so this must be valid
1979 band = local->hw.conf.chandef.chan->band;
1981 #ifdef CONFIG_MAC80211_MESH
1982 case NL80211_IFTYPE_MESH_POINT:
1983 if (!is_multicast_ether_addr(skb->data)) {
1984 struct sta_info *next_hop;
1985 bool mpp_lookup = true;
1987 mpath = mesh_path_lookup(sdata, skb->data);
1990 next_hop = rcu_dereference(mpath->next_hop);
1992 !(mpath->flags & (MESH_PATH_ACTIVE |
1993 MESH_PATH_RESOLVING)))
1998 mppath = mpp_path_lookup(sdata, skb->data);
2000 if (mppath && mpath)
2001 mesh_path_del(mpath->sdata, mpath->dst);
2005 * Use address extension if it is a packet from
2006 * another interface or if we know the destination
2007 * is being proxied by a portal (i.e. portal address
2008 * differs from proxied address)
2010 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2011 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2012 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2013 skb->data, skb->data + ETH_ALEN);
2014 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2017 /* DS -> MBSS (802.11-2012 13.11.3.3).
2018 * For unicast with unknown forwarding information,
2019 * destination might be in the MBSS or if that fails
2020 * forwarded to another mesh gate. In either case
2021 * resolution will be handled in ieee80211_xmit(), so
2022 * leave the original DA. This also works for mcast */
2023 const u8 *mesh_da = skb->data;
2026 mesh_da = mppath->mpp;
2028 mesh_da = mpath->dst;
2030 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2031 mesh_da, sdata->vif.addr);
2032 if (is_multicast_ether_addr(mesh_da))
2033 /* DA TA mSA AE:SA */
2034 meshhdrlen = ieee80211_new_mesh_header(
2036 skb->data + ETH_ALEN, NULL);
2038 /* RA TA mDA mSA AE:DA SA */
2039 meshhdrlen = ieee80211_new_mesh_header(
2040 sdata, &mesh_hdr, skb->data,
2041 skb->data + ETH_ALEN);
2044 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2045 if (!chanctx_conf) {
2049 band = chanctx_conf->def.chan->band;
2052 case NL80211_IFTYPE_STATION:
2053 /* we already did checks when looking up the RA STA */
2054 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2058 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2059 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2060 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2062 } else if (sdata->u.mgd.use_4addr &&
2063 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2064 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2065 IEEE80211_FCTL_TODS);
2067 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2068 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2069 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2070 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2073 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2075 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2076 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2077 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2080 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2081 if (!chanctx_conf) {
2085 band = chanctx_conf->def.chan->band;
2087 case NL80211_IFTYPE_OCB:
2089 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2090 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2091 eth_broadcast_addr(hdr.addr3);
2093 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2094 if (!chanctx_conf) {
2098 band = chanctx_conf->def.chan->band;
2100 case NL80211_IFTYPE_ADHOC:
2102 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2103 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2104 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2106 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2107 if (!chanctx_conf) {
2111 band = chanctx_conf->def.chan->band;
2118 multicast = is_multicast_ether_addr(hdr.addr1);
2120 /* sta is always NULL for mesh */
2122 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2123 wme_sta = sta->sta.wme;
2124 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2125 /* For mesh, the use of the QoS header is mandatory */
2129 /* receiver does QoS (which also means we do) use it */
2131 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2136 * Drop unicast frames to unauthorised stations unless they are
2137 * EAPOL frames from the local station.
2139 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2140 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2141 !multicast && !authorized &&
2142 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2143 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2144 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2145 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2146 sdata->name, hdr.addr1);
2149 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2155 if (unlikely(!multicast && skb->sk &&
2156 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2157 struct sk_buff *ack_skb = skb_clone_sk(skb);
2160 unsigned long flags;
2163 spin_lock_irqsave(&local->ack_status_lock, flags);
2164 id = idr_alloc(&local->ack_status_frames, ack_skb,
2165 1, 0x10000, GFP_ATOMIC);
2166 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2170 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2178 * If the skb is shared we need to obtain our own copy.
2180 if (skb_shared(skb)) {
2181 struct sk_buff *tmp_skb = skb;
2183 /* can't happen -- skb is a clone if info_id != 0 */
2186 skb = skb_clone(skb, GFP_ATOMIC);
2195 hdr.frame_control = fc;
2196 hdr.duration_id = 0;
2199 skip_header_bytes = ETH_HLEN;
2200 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2201 encaps_data = bridge_tunnel_header;
2202 encaps_len = sizeof(bridge_tunnel_header);
2203 skip_header_bytes -= 2;
2204 } else if (ethertype >= ETH_P_802_3_MIN) {
2205 encaps_data = rfc1042_header;
2206 encaps_len = sizeof(rfc1042_header);
2207 skip_header_bytes -= 2;
2213 nh_pos = skb_network_header(skb) - skb->data;
2214 h_pos = skb_transport_header(skb) - skb->data;
2216 skb_pull(skb, skip_header_bytes);
2217 nh_pos -= skip_header_bytes;
2218 h_pos -= skip_header_bytes;
2220 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2223 * So we need to modify the skb header and hence need a copy of
2224 * that. The head_need variable above doesn't, so far, include
2225 * the needed header space that we don't need right away. If we
2226 * can, then we don't reallocate right now but only after the
2227 * frame arrives at the master device (if it does...)
2229 * If we cannot, however, then we will reallocate to include all
2230 * the ever needed space. Also, if we need to reallocate it anyway,
2231 * make it big enough for everything we may ever need.
2234 if (head_need > 0 || skb_cloned(skb)) {
2235 head_need += sdata->encrypt_headroom;
2236 head_need += local->tx_headroom;
2237 head_need = max_t(int, 0, head_need);
2238 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2239 ieee80211_free_txskb(&local->hw, skb);
2241 return ERR_PTR(-ENOMEM);
2246 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2247 nh_pos += encaps_len;
2248 h_pos += encaps_len;
2251 #ifdef CONFIG_MAC80211_MESH
2252 if (meshhdrlen > 0) {
2253 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2254 nh_pos += meshhdrlen;
2255 h_pos += meshhdrlen;
2259 if (ieee80211_is_data_qos(fc)) {
2260 __le16 *qos_control;
2262 qos_control = (__le16 *) skb_push(skb, 2);
2263 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2265 * Maybe we could actually set some fields here, for now just
2266 * initialise to zero to indicate no special operation.
2270 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2275 /* Update skb pointers to various headers since this modified frame
2276 * is going to go through Linux networking code that may potentially
2277 * need things like pointer to IP header. */
2278 skb_set_mac_header(skb, 0);
2279 skb_set_network_header(skb, nh_pos);
2280 skb_set_transport_header(skb, h_pos);
2282 info = IEEE80211_SKB_CB(skb);
2283 memset(info, 0, sizeof(*info));
2285 info->flags = info_flags;
2286 info->ack_frame_id = info_id;
2292 return ERR_PTR(ret);
2295 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2296 struct net_device *dev,
2299 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2300 struct sta_info *sta;
2302 if (unlikely(skb->len < ETH_HLEN)) {
2309 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
2314 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2318 dev->stats.tx_packets++;
2319 dev->stats.tx_bytes += skb->len;
2320 dev->trans_start = jiffies;
2322 ieee80211_xmit(sdata, sta, skb);
2328 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2329 * @skb: packet to be sent
2330 * @dev: incoming interface
2332 * On failure skb will be freed.
2334 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
2335 struct net_device *dev)
2337 __ieee80211_subif_start_xmit(skb, dev, 0);
2338 return NETDEV_TX_OK;
2342 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
2343 struct sk_buff *skb, u32 info_flags)
2345 struct ieee80211_hdr *hdr;
2346 struct ieee80211_tx_data tx = {
2347 .local = sdata->local,
2350 struct sta_info *sta;
2354 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
2356 skb = ERR_PTR(-EINVAL);
2360 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2364 hdr = (void *)skb->data;
2365 tx.sta = sta_info_get(sdata, hdr->addr1);
2368 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
2371 return ERR_PTR(-EINVAL);
2380 * ieee80211_clear_tx_pending may not be called in a context where
2381 * it is possible that it packets could come in again.
2383 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2385 struct sk_buff *skb;
2388 for (i = 0; i < local->hw.queues; i++) {
2389 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2390 ieee80211_free_txskb(&local->hw, skb);
2395 * Returns false if the frame couldn't be transmitted but was queued instead,
2396 * which in this case means re-queued -- take as an indication to stop sending
2397 * more pending frames.
2399 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2400 struct sk_buff *skb)
2402 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2403 struct ieee80211_sub_if_data *sdata;
2404 struct sta_info *sta;
2405 struct ieee80211_hdr *hdr;
2407 struct ieee80211_chanctx_conf *chanctx_conf;
2409 sdata = vif_to_sdata(info->control.vif);
2411 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2412 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2413 if (unlikely(!chanctx_conf)) {
2417 info->band = chanctx_conf->def.chan->band;
2418 result = ieee80211_tx(sdata, NULL, skb, true);
2420 struct sk_buff_head skbs;
2422 __skb_queue_head_init(&skbs);
2423 __skb_queue_tail(&skbs, skb);
2425 hdr = (struct ieee80211_hdr *)skb->data;
2426 sta = sta_info_get(sdata, hdr->addr1);
2428 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2435 * Transmit all pending packets. Called from tasklet.
2437 void ieee80211_tx_pending(unsigned long data)
2439 struct ieee80211_local *local = (struct ieee80211_local *)data;
2440 unsigned long flags;
2446 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2447 for (i = 0; i < local->hw.queues; i++) {
2449 * If queue is stopped by something other than due to pending
2450 * frames, or we have no pending frames, proceed to next queue.
2452 if (local->queue_stop_reasons[i] ||
2453 skb_queue_empty(&local->pending[i]))
2456 while (!skb_queue_empty(&local->pending[i])) {
2457 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2458 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2460 if (WARN_ON(!info->control.vif)) {
2461 ieee80211_free_txskb(&local->hw, skb);
2465 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2468 txok = ieee80211_tx_pending_skb(local, skb);
2469 spin_lock_irqsave(&local->queue_stop_reason_lock,
2475 if (skb_queue_empty(&local->pending[i]))
2476 ieee80211_propagate_queue_wake(local, i);
2478 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2483 /* functions for drivers to get certain frames */
2485 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2486 struct ps_data *ps, struct sk_buff *skb,
2491 int i, have_bits = 0, n1, n2;
2493 /* Generate bitmap for TIM only if there are any STAs in power save
2495 if (atomic_read(&ps->num_sta_ps) > 0)
2496 /* in the hope that this is faster than
2497 * checking byte-for-byte */
2498 have_bits = !bitmap_empty((unsigned long *)ps->tim,
2499 IEEE80211_MAX_AID+1);
2501 if (ps->dtim_count == 0)
2502 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2507 tim = pos = (u8 *) skb_put(skb, 6);
2508 *pos++ = WLAN_EID_TIM;
2510 *pos++ = ps->dtim_count;
2511 *pos++ = sdata->vif.bss_conf.dtim_period;
2513 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2516 ps->dtim_bc_mc = aid0 == 1;
2519 /* Find largest even number N1 so that bits numbered 1 through
2520 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2521 * (N2 + 1) x 8 through 2007 are 0. */
2523 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2530 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2537 /* Bitmap control */
2539 /* Part Virt Bitmap */
2540 skb_put(skb, n2 - n1);
2541 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2543 tim[1] = n2 - n1 + 4;
2545 *pos++ = aid0; /* Bitmap control */
2546 *pos++ = 0; /* Part Virt Bitmap */
2550 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2551 struct ps_data *ps, struct sk_buff *skb,
2554 struct ieee80211_local *local = sdata->local;
2557 * Not very nice, but we want to allow the driver to call
2558 * ieee80211_beacon_get() as a response to the set_tim()
2559 * callback. That, however, is already invoked under the
2560 * sta_lock to guarantee consistent and race-free update
2561 * of the tim bitmap in mac80211 and the driver.
2563 if (local->tim_in_locked_section) {
2564 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2566 spin_lock_bh(&local->tim_lock);
2567 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2568 spin_unlock_bh(&local->tim_lock);
2574 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
2575 struct beacon_data *beacon)
2577 struct probe_resp *resp;
2579 size_t beacon_data_len;
2581 u8 count = beacon->csa_current_counter;
2583 switch (sdata->vif.type) {
2584 case NL80211_IFTYPE_AP:
2585 beacon_data = beacon->tail;
2586 beacon_data_len = beacon->tail_len;
2588 case NL80211_IFTYPE_ADHOC:
2589 beacon_data = beacon->head;
2590 beacon_data_len = beacon->head_len;
2592 case NL80211_IFTYPE_MESH_POINT:
2593 beacon_data = beacon->head;
2594 beacon_data_len = beacon->head_len;
2601 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
2602 resp = rcu_dereference(sdata->u.ap.probe_resp);
2604 if (beacon->csa_counter_offsets[i]) {
2605 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
2611 beacon_data[beacon->csa_counter_offsets[i]] = count;
2614 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
2615 resp->data[resp->csa_counter_offsets[i]] = count;
2620 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
2622 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2623 struct beacon_data *beacon = NULL;
2628 if (sdata->vif.type == NL80211_IFTYPE_AP)
2629 beacon = rcu_dereference(sdata->u.ap.beacon);
2630 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2631 beacon = rcu_dereference(sdata->u.ibss.presp);
2632 else if (ieee80211_vif_is_mesh(&sdata->vif))
2633 beacon = rcu_dereference(sdata->u.mesh.beacon);
2638 beacon->csa_current_counter--;
2640 /* the counter should never reach 0 */
2641 WARN_ON_ONCE(!beacon->csa_current_counter);
2642 count = beacon->csa_current_counter;
2648 EXPORT_SYMBOL(ieee80211_csa_update_counter);
2650 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
2652 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2653 struct beacon_data *beacon = NULL;
2655 size_t beacon_data_len;
2658 if (!ieee80211_sdata_running(sdata))
2662 if (vif->type == NL80211_IFTYPE_AP) {
2663 struct ieee80211_if_ap *ap = &sdata->u.ap;
2665 beacon = rcu_dereference(ap->beacon);
2666 if (WARN_ON(!beacon || !beacon->tail))
2668 beacon_data = beacon->tail;
2669 beacon_data_len = beacon->tail_len;
2670 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
2671 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2673 beacon = rcu_dereference(ifibss->presp);
2677 beacon_data = beacon->head;
2678 beacon_data_len = beacon->head_len;
2679 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
2680 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2682 beacon = rcu_dereference(ifmsh->beacon);
2686 beacon_data = beacon->head;
2687 beacon_data_len = beacon->head_len;
2693 if (!beacon->csa_counter_offsets[0])
2696 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
2699 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
2706 EXPORT_SYMBOL(ieee80211_csa_is_complete);
2708 static struct sk_buff *
2709 __ieee80211_beacon_get(struct ieee80211_hw *hw,
2710 struct ieee80211_vif *vif,
2711 struct ieee80211_mutable_offsets *offs,
2714 struct ieee80211_local *local = hw_to_local(hw);
2715 struct beacon_data *beacon = NULL;
2716 struct sk_buff *skb = NULL;
2717 struct ieee80211_tx_info *info;
2718 struct ieee80211_sub_if_data *sdata = NULL;
2719 enum ieee80211_band band;
2720 struct ieee80211_tx_rate_control txrc;
2721 struct ieee80211_chanctx_conf *chanctx_conf;
2722 int csa_off_base = 0;
2726 sdata = vif_to_sdata(vif);
2727 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2729 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2733 memset(offs, 0, sizeof(*offs));
2735 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2736 struct ieee80211_if_ap *ap = &sdata->u.ap;
2738 beacon = rcu_dereference(ap->beacon);
2740 if (beacon->csa_counter_offsets[0]) {
2742 ieee80211_csa_update_counter(vif);
2744 ieee80211_set_csa(sdata, beacon);
2748 * headroom, head length,
2749 * tail length and maximum TIM length
2751 skb = dev_alloc_skb(local->tx_headroom +
2753 beacon->tail_len + 256 +
2754 local->hw.extra_beacon_tailroom);
2758 skb_reserve(skb, local->tx_headroom);
2759 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2762 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
2766 offs->tim_offset = beacon->head_len;
2767 offs->tim_length = skb->len - beacon->head_len;
2769 /* for AP the csa offsets are from tail */
2770 csa_off_base = skb->len;
2774 memcpy(skb_put(skb, beacon->tail_len),
2775 beacon->tail, beacon->tail_len);
2778 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2779 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2780 struct ieee80211_hdr *hdr;
2782 beacon = rcu_dereference(ifibss->presp);
2786 if (beacon->csa_counter_offsets[0]) {
2788 ieee80211_csa_update_counter(vif);
2790 ieee80211_set_csa(sdata, beacon);
2793 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
2794 local->hw.extra_beacon_tailroom);
2797 skb_reserve(skb, local->tx_headroom);
2798 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2801 hdr = (struct ieee80211_hdr *) skb->data;
2802 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2803 IEEE80211_STYPE_BEACON);
2804 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2805 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2807 beacon = rcu_dereference(ifmsh->beacon);
2811 if (beacon->csa_counter_offsets[0]) {
2813 /* TODO: For mesh csa_counter is in TU, so
2814 * decrementing it by one isn't correct, but
2815 * for now we leave it consistent with overall
2816 * mac80211's behavior.
2818 ieee80211_csa_update_counter(vif);
2820 ieee80211_set_csa(sdata, beacon);
2823 if (ifmsh->sync_ops)
2824 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
2826 skb = dev_alloc_skb(local->tx_headroom +
2830 local->hw.extra_beacon_tailroom);
2833 skb_reserve(skb, local->tx_headroom);
2834 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2836 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
2839 offs->tim_offset = beacon->head_len;
2840 offs->tim_length = skb->len - beacon->head_len;
2843 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
2851 if (offs && beacon) {
2854 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
2855 u16 csa_off = beacon->csa_counter_offsets[i];
2860 offs->csa_counter_offs[i] = csa_off_base + csa_off;
2864 band = chanctx_conf->def.chan->band;
2866 info = IEEE80211_SKB_CB(skb);
2868 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2869 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2872 memset(&txrc, 0, sizeof(txrc));
2874 txrc.sband = local->hw.wiphy->bands[band];
2875 txrc.bss_conf = &sdata->vif.bss_conf;
2877 txrc.reported_rate.idx = -1;
2878 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2879 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2880 txrc.max_rate_idx = -1;
2882 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2884 rate_control_get_rate(sdata, NULL, &txrc);
2886 info->control.vif = vif;
2888 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2889 IEEE80211_TX_CTL_ASSIGN_SEQ |
2890 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2898 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
2899 struct ieee80211_vif *vif,
2900 struct ieee80211_mutable_offsets *offs)
2902 return __ieee80211_beacon_get(hw, vif, offs, true);
2904 EXPORT_SYMBOL(ieee80211_beacon_get_template);
2906 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2907 struct ieee80211_vif *vif,
2908 u16 *tim_offset, u16 *tim_length)
2910 struct ieee80211_mutable_offsets offs = {};
2911 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
2914 *tim_offset = offs.tim_offset;
2917 *tim_length = offs.tim_length;
2921 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2923 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2924 struct ieee80211_vif *vif)
2926 struct ieee80211_if_ap *ap = NULL;
2927 struct sk_buff *skb = NULL;
2928 struct probe_resp *presp = NULL;
2929 struct ieee80211_hdr *hdr;
2930 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2932 if (sdata->vif.type != NL80211_IFTYPE_AP)
2938 presp = rcu_dereference(ap->probe_resp);
2942 skb = dev_alloc_skb(presp->len);
2946 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2948 hdr = (struct ieee80211_hdr *) skb->data;
2949 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2955 EXPORT_SYMBOL(ieee80211_proberesp_get);
2957 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2958 struct ieee80211_vif *vif)
2960 struct ieee80211_sub_if_data *sdata;
2961 struct ieee80211_if_managed *ifmgd;
2962 struct ieee80211_pspoll *pspoll;
2963 struct ieee80211_local *local;
2964 struct sk_buff *skb;
2966 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2969 sdata = vif_to_sdata(vif);
2970 ifmgd = &sdata->u.mgd;
2971 local = sdata->local;
2973 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2977 skb_reserve(skb, local->hw.extra_tx_headroom);
2979 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2980 memset(pspoll, 0, sizeof(*pspoll));
2981 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2982 IEEE80211_STYPE_PSPOLL);
2983 pspoll->aid = cpu_to_le16(ifmgd->aid);
2985 /* aid in PS-Poll has its two MSBs each set to 1 */
2986 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2988 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2989 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2993 EXPORT_SYMBOL(ieee80211_pspoll_get);
2995 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2996 struct ieee80211_vif *vif)
2998 struct ieee80211_hdr_3addr *nullfunc;
2999 struct ieee80211_sub_if_data *sdata;
3000 struct ieee80211_if_managed *ifmgd;
3001 struct ieee80211_local *local;
3002 struct sk_buff *skb;
3004 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3007 sdata = vif_to_sdata(vif);
3008 ifmgd = &sdata->u.mgd;
3009 local = sdata->local;
3011 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
3015 skb_reserve(skb, local->hw.extra_tx_headroom);
3017 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
3019 memset(nullfunc, 0, sizeof(*nullfunc));
3020 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
3021 IEEE80211_STYPE_NULLFUNC |
3022 IEEE80211_FCTL_TODS);
3023 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
3024 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
3025 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
3029 EXPORT_SYMBOL(ieee80211_nullfunc_get);
3031 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
3033 const u8 *ssid, size_t ssid_len,
3036 struct ieee80211_local *local = hw_to_local(hw);
3037 struct ieee80211_hdr_3addr *hdr;
3038 struct sk_buff *skb;
3042 ie_ssid_len = 2 + ssid_len;
3044 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
3045 ie_ssid_len + tailroom);
3049 skb_reserve(skb, local->hw.extra_tx_headroom);
3051 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3052 memset(hdr, 0, sizeof(*hdr));
3053 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3054 IEEE80211_STYPE_PROBE_REQ);
3055 eth_broadcast_addr(hdr->addr1);
3056 memcpy(hdr->addr2, src_addr, ETH_ALEN);
3057 eth_broadcast_addr(hdr->addr3);
3059 pos = skb_put(skb, ie_ssid_len);
3060 *pos++ = WLAN_EID_SSID;
3063 memcpy(pos, ssid, ssid_len);
3068 EXPORT_SYMBOL(ieee80211_probereq_get);
3070 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3071 const void *frame, size_t frame_len,
3072 const struct ieee80211_tx_info *frame_txctl,
3073 struct ieee80211_rts *rts)
3075 const struct ieee80211_hdr *hdr = frame;
3077 rts->frame_control =
3078 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3079 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3081 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3082 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3084 EXPORT_SYMBOL(ieee80211_rts_get);
3086 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3087 const void *frame, size_t frame_len,
3088 const struct ieee80211_tx_info *frame_txctl,
3089 struct ieee80211_cts *cts)
3091 const struct ieee80211_hdr *hdr = frame;
3093 cts->frame_control =
3094 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3095 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3096 frame_len, frame_txctl);
3097 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3099 EXPORT_SYMBOL(ieee80211_ctstoself_get);
3102 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3103 struct ieee80211_vif *vif)
3105 struct ieee80211_local *local = hw_to_local(hw);
3106 struct sk_buff *skb = NULL;
3107 struct ieee80211_tx_data tx;
3108 struct ieee80211_sub_if_data *sdata;
3110 struct ieee80211_tx_info *info;
3111 struct ieee80211_chanctx_conf *chanctx_conf;
3113 sdata = vif_to_sdata(vif);
3116 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3121 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3122 struct beacon_data *beacon =
3123 rcu_dereference(sdata->u.ap.beacon);
3125 if (!beacon || !beacon->head)
3128 ps = &sdata->u.ap.ps;
3129 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3130 ps = &sdata->u.mesh.ps;
3135 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3136 goto out; /* send buffered bc/mc only after DTIM beacon */
3139 skb = skb_dequeue(&ps->bc_buf);
3142 local->total_ps_buffered--;
3144 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3145 struct ieee80211_hdr *hdr =
3146 (struct ieee80211_hdr *) skb->data;
3147 /* more buffered multicast/broadcast frames ==> set
3148 * MoreData flag in IEEE 802.11 header to inform PS
3150 hdr->frame_control |=
3151 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3154 if (sdata->vif.type == NL80211_IFTYPE_AP)
3155 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3156 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
3158 dev_kfree_skb_any(skb);
3161 info = IEEE80211_SKB_CB(skb);
3163 tx.flags |= IEEE80211_TX_PS_BUFFERED;
3164 info->band = chanctx_conf->def.chan->band;
3166 if (invoke_tx_handlers(&tx))
3173 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3175 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3177 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3178 struct ieee80211_sub_if_data *sdata = sta->sdata;
3179 struct ieee80211_local *local = sdata->local;
3183 lockdep_assert_held(&local->sta_mtx);
3185 /* only some cases are supported right now */
3186 switch (sdata->vif.type) {
3187 case NL80211_IFTYPE_STATION:
3188 case NL80211_IFTYPE_AP:
3189 case NL80211_IFTYPE_AP_VLAN:
3196 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3199 if (sta->reserved_tid == tid) {
3204 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3205 sdata_err(sdata, "TID reservation already active\n");
3210 ieee80211_stop_vif_queues(sdata->local, sdata,
3211 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3215 /* Tear down BA sessions so we stop aggregating on this TID */
3216 if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) {
3217 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3218 __ieee80211_stop_tx_ba_session(sta, tid,
3219 AGG_STOP_LOCAL_REQUEST);
3222 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3223 __ieee80211_flush_queues(local, sdata, queues, false);
3225 sta->reserved_tid = tid;
3227 ieee80211_wake_vif_queues(local, sdata,
3228 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3230 if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)
3231 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3237 EXPORT_SYMBOL(ieee80211_reserve_tid);
3239 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3241 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3242 struct ieee80211_sub_if_data *sdata = sta->sdata;
3244 lockdep_assert_held(&sdata->local->sta_mtx);
3246 /* only some cases are supported right now */
3247 switch (sdata->vif.type) {
3248 case NL80211_IFTYPE_STATION:
3249 case NL80211_IFTYPE_AP:
3250 case NL80211_IFTYPE_AP_VLAN:
3257 if (tid != sta->reserved_tid) {
3258 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3262 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3264 EXPORT_SYMBOL(ieee80211_unreserve_tid);
3266 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3267 struct sk_buff *skb, int tid,
3268 enum ieee80211_band band)
3270 int ac = ieee802_1d_to_ac[tid & 7];
3272 skb_set_mac_header(skb, 0);
3273 skb_set_network_header(skb, 0);
3274 skb_set_transport_header(skb, 0);
3276 skb_set_queue_mapping(skb, ac);
3277 skb->priority = tid;
3279 skb->dev = sdata->dev;
3282 * The other path calling ieee80211_xmit is from the tasklet,
3283 * and while we can handle concurrent transmissions locking
3284 * requirements are that we do not come into tx with bhs on.
3287 IEEE80211_SKB_CB(skb)->band = band;
3288 ieee80211_xmit(sdata, NULL, skb);