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;
573 static ieee80211_tx_result debug_noinline
574 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
576 struct ieee80211_key *key;
577 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
578 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
580 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
583 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
585 else if (ieee80211_is_mgmt(hdr->frame_control) &&
586 is_multicast_ether_addr(hdr->addr1) &&
587 ieee80211_is_robust_mgmt_frame(tx->skb) &&
588 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
590 else if (is_multicast_ether_addr(hdr->addr1) &&
591 (key = rcu_dereference(tx->sdata->default_multicast_key)))
593 else if (!is_multicast_ether_addr(hdr->addr1) &&
594 (key = rcu_dereference(tx->sdata->default_unicast_key)))
600 bool skip_hw = false;
602 tx->key->tx_rx_count++;
603 /* TODO: add threshold stuff again */
605 switch (tx->key->conf.cipher) {
606 case WLAN_CIPHER_SUITE_WEP40:
607 case WLAN_CIPHER_SUITE_WEP104:
608 case WLAN_CIPHER_SUITE_TKIP:
609 if (!ieee80211_is_data_present(hdr->frame_control))
612 case WLAN_CIPHER_SUITE_CCMP:
613 case WLAN_CIPHER_SUITE_CCMP_256:
614 case WLAN_CIPHER_SUITE_GCMP:
615 case WLAN_CIPHER_SUITE_GCMP_256:
616 if (!ieee80211_is_data_present(hdr->frame_control) &&
617 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
621 skip_hw = (tx->key->conf.flags &
622 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
623 ieee80211_is_mgmt(hdr->frame_control);
625 case WLAN_CIPHER_SUITE_AES_CMAC:
626 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
627 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
628 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
629 if (!ieee80211_is_mgmt(hdr->frame_control))
634 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
635 !ieee80211_is_deauth(hdr->frame_control)))
638 if (!skip_hw && tx->key &&
639 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
640 info->control.hw_key = &tx->key->conf;
646 static ieee80211_tx_result debug_noinline
647 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
649 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
650 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
651 struct ieee80211_supported_band *sband;
653 struct ieee80211_tx_rate_control txrc;
654 struct ieee80211_sta_rates *ratetbl = NULL;
657 memset(&txrc, 0, sizeof(txrc));
659 sband = tx->local->hw.wiphy->bands[info->band];
661 len = min_t(u32, tx->skb->len + FCS_LEN,
662 tx->local->hw.wiphy->frag_threshold);
664 /* set up the tx rate control struct we give the RC algo */
665 txrc.hw = &tx->local->hw;
667 txrc.bss_conf = &tx->sdata->vif.bss_conf;
669 txrc.reported_rate.idx = -1;
670 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
671 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
672 txrc.max_rate_idx = -1;
674 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
676 if (tx->sdata->rc_has_mcs_mask[info->band])
677 txrc.rate_idx_mcs_mask =
678 tx->sdata->rc_rateidx_mcs_mask[info->band];
680 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
681 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
682 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
684 /* set up RTS protection if desired */
685 if (len > tx->local->hw.wiphy->rts_threshold) {
689 info->control.use_rts = txrc.rts;
690 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
693 * Use short preamble if the BSS can handle it, but not for
694 * management frames unless we know the receiver can handle
695 * that -- the management frame might be to a station that
696 * just wants a probe response.
698 if (tx->sdata->vif.bss_conf.use_short_preamble &&
699 (ieee80211_is_data(hdr->frame_control) ||
700 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
701 txrc.short_preamble = true;
703 info->control.short_preamble = txrc.short_preamble;
706 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
709 * Lets not bother rate control if we're associated and cannot
710 * talk to the sta. This should not happen.
712 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
713 !rate_usable_index_exists(sband, &tx->sta->sta),
714 "%s: Dropped data frame as no usable bitrate found while "
715 "scanning and associated. Target station: "
716 "%pM on %d GHz band\n",
717 tx->sdata->name, hdr->addr1,
722 * If we're associated with the sta at this point we know we can at
723 * least send the frame at the lowest bit rate.
725 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
727 if (tx->sta && !info->control.skip_table)
728 ratetbl = rcu_dereference(tx->sta->sta.rates);
730 if (unlikely(info->control.rates[0].idx < 0)) {
732 struct ieee80211_tx_rate rate = {
733 .idx = ratetbl->rate[0].idx,
734 .flags = ratetbl->rate[0].flags,
735 .count = ratetbl->rate[0].count
738 if (ratetbl->rate[0].idx < 0)
746 tx->rate = info->control.rates[0];
749 if (txrc.reported_rate.idx < 0) {
750 txrc.reported_rate = tx->rate;
751 if (tx->sta && ieee80211_is_data(hdr->frame_control))
752 tx->sta->last_tx_rate = txrc.reported_rate;
754 tx->sta->last_tx_rate = txrc.reported_rate;
759 if (unlikely(!info->control.rates[0].count))
760 info->control.rates[0].count = 1;
762 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
763 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
764 info->control.rates[0].count = 1;
769 static ieee80211_tx_result debug_noinline
770 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
772 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
773 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
779 * Packet injection may want to control the sequence
780 * number, if we have no matching interface then we
781 * neither assign one ourselves nor ask the driver to.
783 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
786 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
789 if (ieee80211_hdrlen(hdr->frame_control) < 24)
792 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
796 * Anything but QoS data that has a sequence number field
797 * (is long enough) gets a sequence number from the global
798 * counter. QoS data frames with a multicast destination
799 * also use the global counter (802.11-2012 9.3.2.10).
801 if (!ieee80211_is_data_qos(hdr->frame_control) ||
802 is_multicast_ether_addr(hdr->addr1)) {
803 /* driver should assign sequence number */
804 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
805 /* for pure STA mode without beacons, we can do it */
806 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
807 tx->sdata->sequence_number += 0x10;
809 tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++;
814 * This should be true for injected/management frames only, for
815 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
816 * above since they are not QoS-data frames.
821 /* include per-STA, per-TID sequence counter */
823 qc = ieee80211_get_qos_ctl(hdr);
824 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
825 seq = &tx->sta->tid_seq[tid];
826 tx->sta->tx_msdu[tid]++;
828 hdr->seq_ctrl = cpu_to_le16(*seq);
830 /* Increase the sequence number. */
831 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
836 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
837 struct sk_buff *skb, int hdrlen,
840 struct ieee80211_local *local = tx->local;
841 struct ieee80211_tx_info *info;
843 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
844 int pos = hdrlen + per_fragm;
845 int rem = skb->len - hdrlen - per_fragm;
847 if (WARN_ON(rem < 0))
850 /* first fragment was already added to queue by caller */
853 int fraglen = per_fragm;
858 tmp = dev_alloc_skb(local->tx_headroom +
860 tx->sdata->encrypt_headroom +
861 IEEE80211_ENCRYPT_TAILROOM);
865 __skb_queue_tail(&tx->skbs, tmp);
868 local->tx_headroom + tx->sdata->encrypt_headroom);
870 /* copy control information */
871 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
873 info = IEEE80211_SKB_CB(tmp);
874 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
875 IEEE80211_TX_CTL_FIRST_FRAGMENT);
878 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
880 skb_copy_queue_mapping(tmp, skb);
881 tmp->priority = skb->priority;
884 /* copy header and data */
885 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
886 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
891 /* adjust first fragment's length */
892 skb_trim(skb, hdrlen + per_fragm);
896 static ieee80211_tx_result debug_noinline
897 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
899 struct sk_buff *skb = tx->skb;
900 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
901 struct ieee80211_hdr *hdr = (void *)skb->data;
902 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
906 /* no matter what happens, tx->skb moves to tx->skbs */
907 __skb_queue_tail(&tx->skbs, skb);
910 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
913 if (tx->local->ops->set_frag_threshold)
917 * Warn when submitting a fragmented A-MPDU frame and drop it.
918 * This scenario is handled in ieee80211_tx_prepare but extra
919 * caution taken here as fragmented ampdu may cause Tx stop.
921 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
924 hdrlen = ieee80211_hdrlen(hdr->frame_control);
926 /* internal error, why isn't DONTFRAG set? */
927 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
931 * Now fragment the frame. This will allocate all the fragments and
932 * chain them (using skb as the first fragment) to skb->next.
933 * During transmission, we will remove the successfully transmitted
934 * fragments from this list. When the low-level driver rejects one
935 * of the fragments then we will simply pretend to accept the skb
936 * but store it away as pending.
938 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
941 /* update duration/seq/flags of fragments */
944 skb_queue_walk(&tx->skbs, skb) {
945 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
947 hdr = (void *)skb->data;
948 info = IEEE80211_SKB_CB(skb);
950 if (!skb_queue_is_last(&tx->skbs, skb)) {
951 hdr->frame_control |= morefrags;
953 * No multi-rate retries for fragmented frames, that
954 * would completely throw off the NAV at other STAs.
956 info->control.rates[1].idx = -1;
957 info->control.rates[2].idx = -1;
958 info->control.rates[3].idx = -1;
959 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
960 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
962 hdr->frame_control &= ~morefrags;
964 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
971 static ieee80211_tx_result debug_noinline
972 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
980 skb_queue_walk(&tx->skbs, skb) {
981 ac = skb_get_queue_mapping(skb);
982 tx->sta->tx_fragments++;
983 tx->sta->tx_bytes[ac] += skb->len;
986 tx->sta->tx_packets[ac]++;
991 static ieee80211_tx_result debug_noinline
992 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
997 switch (tx->key->conf.cipher) {
998 case WLAN_CIPHER_SUITE_WEP40:
999 case WLAN_CIPHER_SUITE_WEP104:
1000 return ieee80211_crypto_wep_encrypt(tx);
1001 case WLAN_CIPHER_SUITE_TKIP:
1002 return ieee80211_crypto_tkip_encrypt(tx);
1003 case WLAN_CIPHER_SUITE_CCMP:
1004 return ieee80211_crypto_ccmp_encrypt(
1005 tx, IEEE80211_CCMP_MIC_LEN);
1006 case WLAN_CIPHER_SUITE_CCMP_256:
1007 return ieee80211_crypto_ccmp_encrypt(
1008 tx, IEEE80211_CCMP_256_MIC_LEN);
1009 case WLAN_CIPHER_SUITE_AES_CMAC:
1010 return ieee80211_crypto_aes_cmac_encrypt(tx);
1011 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1012 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1013 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1014 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1015 return ieee80211_crypto_aes_gmac_encrypt(tx);
1016 case WLAN_CIPHER_SUITE_GCMP:
1017 case WLAN_CIPHER_SUITE_GCMP_256:
1018 return ieee80211_crypto_gcmp_encrypt(tx);
1020 return ieee80211_crypto_hw_encrypt(tx);
1026 static ieee80211_tx_result debug_noinline
1027 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1029 struct sk_buff *skb;
1030 struct ieee80211_hdr *hdr;
1034 skb_queue_walk(&tx->skbs, skb) {
1035 hdr = (void *) skb->data;
1036 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1037 break; /* must not overwrite AID */
1038 if (!skb_queue_is_last(&tx->skbs, skb)) {
1039 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1040 next_len = next->len;
1043 group_addr = is_multicast_ether_addr(hdr->addr1);
1046 ieee80211_duration(tx, skb, group_addr, next_len);
1052 /* actual transmit path */
1054 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1055 struct sk_buff *skb,
1056 struct ieee80211_tx_info *info,
1057 struct tid_ampdu_tx *tid_tx,
1060 bool queued = false;
1061 bool reset_agg_timer = false;
1062 struct sk_buff *purge_skb = NULL;
1064 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1065 info->flags |= IEEE80211_TX_CTL_AMPDU;
1066 reset_agg_timer = true;
1067 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1069 * nothing -- this aggregation session is being started
1070 * but that might still fail with the driver
1073 spin_lock(&tx->sta->lock);
1075 * Need to re-check now, because we may get here
1077 * 1) in the window during which the setup is actually
1078 * already done, but not marked yet because not all
1079 * packets are spliced over to the driver pending
1080 * queue yet -- if this happened we acquire the lock
1081 * either before or after the splice happens, but
1082 * need to recheck which of these cases happened.
1084 * 2) during session teardown, if the OPERATIONAL bit
1085 * was cleared due to the teardown but the pointer
1086 * hasn't been assigned NULL yet (or we loaded it
1087 * before it was assigned) -- in this case it may
1088 * now be NULL which means we should just let the
1089 * packet pass through because splicing the frames
1090 * back is already done.
1092 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1095 /* do nothing, let packet pass through */
1096 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1097 info->flags |= IEEE80211_TX_CTL_AMPDU;
1098 reset_agg_timer = true;
1101 info->control.vif = &tx->sdata->vif;
1102 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1103 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1104 __skb_queue_tail(&tid_tx->pending, skb);
1105 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1106 purge_skb = __skb_dequeue(&tid_tx->pending);
1108 spin_unlock(&tx->sta->lock);
1111 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1114 /* reset session timer */
1115 if (reset_agg_timer && tid_tx->timeout)
1116 tid_tx->last_tx = jiffies;
1123 * pass %NULL for the station if unknown, a valid pointer if known
1124 * or an ERR_PTR() if the station is known not to exist
1126 static ieee80211_tx_result
1127 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1128 struct ieee80211_tx_data *tx,
1129 struct sta_info *sta, struct sk_buff *skb)
1131 struct ieee80211_local *local = sdata->local;
1132 struct ieee80211_hdr *hdr;
1133 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1137 memset(tx, 0, sizeof(*tx));
1141 __skb_queue_head_init(&tx->skbs);
1144 * If this flag is set to true anywhere, and we get here,
1145 * we are doing the needed processing, so remove the flag
1148 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1150 hdr = (struct ieee80211_hdr *) skb->data;
1156 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1157 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1158 if (!tx->sta && sdata->wdev.use_4addr)
1160 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1161 IEEE80211_TX_CTL_INJECTED) ||
1162 tx->sdata->control_port_protocol == tx->skb->protocol) {
1163 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1165 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1166 tx->sta = sta_info_get(sdata, hdr->addr1);
1169 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1170 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1171 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1172 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1173 struct tid_ampdu_tx *tid_tx;
1175 qc = ieee80211_get_qos_ctl(hdr);
1176 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1178 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1182 queued = ieee80211_tx_prep_agg(tx, skb, info,
1185 if (unlikely(queued))
1190 if (is_multicast_ether_addr(hdr->addr1)) {
1191 tx->flags &= ~IEEE80211_TX_UNICAST;
1192 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1194 tx->flags |= IEEE80211_TX_UNICAST;
1196 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1197 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1198 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1199 info->flags & IEEE80211_TX_CTL_AMPDU)
1200 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1204 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1205 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1206 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1208 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1213 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1214 struct ieee80211_vif *vif,
1215 struct ieee80211_sta *sta,
1216 struct sk_buff_head *skbs,
1219 struct ieee80211_tx_control control;
1220 struct sk_buff *skb, *tmp;
1221 unsigned long flags;
1223 skb_queue_walk_safe(skbs, skb, tmp) {
1224 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1225 int q = info->hw_queue;
1227 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1228 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1229 __skb_unlink(skb, skbs);
1230 ieee80211_free_txskb(&local->hw, skb);
1235 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1236 if (local->queue_stop_reasons[q] ||
1237 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1238 if (unlikely(info->flags &
1239 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1240 if (local->queue_stop_reasons[q] &
1241 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1243 * Drop off-channel frames if queues
1244 * are stopped for any reason other
1245 * than off-channel operation. Never
1248 spin_unlock_irqrestore(
1249 &local->queue_stop_reason_lock,
1251 ieee80211_purge_tx_queue(&local->hw,
1258 * Since queue is stopped, queue up frames for
1259 * later transmission from the tx-pending
1260 * tasklet when the queue is woken again.
1263 skb_queue_splice_init(skbs,
1264 &local->pending[q]);
1266 skb_queue_splice_tail_init(skbs,
1267 &local->pending[q]);
1269 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1274 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1276 info->control.vif = vif;
1279 __skb_unlink(skb, skbs);
1280 drv_tx(local, &control, skb);
1287 * Returns false if the frame couldn't be transmitted but was queued instead.
1289 static bool __ieee80211_tx(struct ieee80211_local *local,
1290 struct sk_buff_head *skbs, int led_len,
1291 struct sta_info *sta, bool txpending)
1293 struct ieee80211_tx_info *info;
1294 struct ieee80211_sub_if_data *sdata;
1295 struct ieee80211_vif *vif;
1296 struct ieee80211_sta *pubsta;
1297 struct sk_buff *skb;
1301 if (WARN_ON(skb_queue_empty(skbs)))
1304 skb = skb_peek(skbs);
1305 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1306 info = IEEE80211_SKB_CB(skb);
1307 sdata = vif_to_sdata(info->control.vif);
1308 if (sta && !sta->uploaded)
1316 switch (sdata->vif.type) {
1317 case NL80211_IFTYPE_MONITOR:
1318 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1322 sdata = rcu_dereference(local->monitor_sdata);
1326 vif->hw_queue[skb_get_queue_mapping(skb)];
1327 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1333 case NL80211_IFTYPE_AP_VLAN:
1334 sdata = container_of(sdata->bss,
1335 struct ieee80211_sub_if_data, u.ap);
1342 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1345 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1347 WARN_ON_ONCE(!skb_queue_empty(skbs));
1353 * Invoke TX handlers, return 0 on success and non-zero if the
1354 * frame was dropped or queued.
1356 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1358 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1359 ieee80211_tx_result res = TX_DROP;
1361 #define CALL_TXH(txh) \
1364 if (res != TX_CONTINUE) \
1368 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1369 CALL_TXH(ieee80211_tx_h_check_assoc);
1370 CALL_TXH(ieee80211_tx_h_ps_buf);
1371 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1372 CALL_TXH(ieee80211_tx_h_select_key);
1373 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1374 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1376 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1377 __skb_queue_tail(&tx->skbs, tx->skb);
1382 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1383 CALL_TXH(ieee80211_tx_h_sequence);
1384 CALL_TXH(ieee80211_tx_h_fragment);
1385 /* handlers after fragment must be aware of tx info fragmentation! */
1386 CALL_TXH(ieee80211_tx_h_stats);
1387 CALL_TXH(ieee80211_tx_h_encrypt);
1388 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1389 CALL_TXH(ieee80211_tx_h_calculate_duration);
1393 if (unlikely(res == TX_DROP)) {
1394 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1396 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1398 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1400 } else if (unlikely(res == TX_QUEUED)) {
1401 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1408 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1409 struct ieee80211_vif *vif, struct sk_buff *skb,
1410 int band, struct ieee80211_sta **sta)
1412 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1413 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1414 struct ieee80211_tx_data tx;
1415 struct sk_buff *skb2;
1417 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1421 info->control.vif = vif;
1422 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1424 if (invoke_tx_handlers(&tx))
1429 *sta = &tx.sta->sta;
1434 /* this function isn't suitable for fragmented data frames */
1435 skb2 = __skb_dequeue(&tx.skbs);
1436 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1437 ieee80211_free_txskb(hw, skb2);
1438 ieee80211_purge_tx_queue(hw, &tx.skbs);
1444 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1447 * Returns false if the frame couldn't be transmitted but was queued instead.
1449 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1450 struct sta_info *sta, struct sk_buff *skb,
1453 struct ieee80211_local *local = sdata->local;
1454 struct ieee80211_tx_data tx;
1455 ieee80211_tx_result res_prepare;
1456 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1460 if (unlikely(skb->len < 10)) {
1465 /* initialises tx */
1467 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1469 if (unlikely(res_prepare == TX_DROP)) {
1470 ieee80211_free_txskb(&local->hw, skb);
1472 } else if (unlikely(res_prepare == TX_QUEUED)) {
1476 /* set up hw_queue value early */
1477 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1478 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1480 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1482 if (!invoke_tx_handlers(&tx))
1483 result = __ieee80211_tx(local, &tx.skbs, led_len,
1489 /* device xmit handlers */
1491 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1492 struct sk_buff *skb,
1493 int head_need, bool may_encrypt)
1495 struct ieee80211_local *local = sdata->local;
1498 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1499 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1500 tail_need -= skb_tailroom(skb);
1501 tail_need = max_t(int, tail_need, 0);
1504 if (skb_cloned(skb) &&
1505 (!(local->hw.flags & IEEE80211_HW_SUPPORTS_CLONED_SKBS) ||
1506 !skb_clone_writable(skb, ETH_HLEN) ||
1507 sdata->crypto_tx_tailroom_needed_cnt))
1508 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1509 else if (head_need || tail_need)
1510 I802_DEBUG_INC(local->tx_expand_skb_head);
1514 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1515 wiphy_debug(local->hw.wiphy,
1516 "failed to reallocate TX buffer\n");
1523 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1524 struct sta_info *sta, struct sk_buff *skb)
1526 struct ieee80211_local *local = sdata->local;
1527 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1528 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1532 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1534 headroom = local->tx_headroom;
1536 headroom += sdata->encrypt_headroom;
1537 headroom -= skb_headroom(skb);
1538 headroom = max_t(int, 0, headroom);
1540 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1541 ieee80211_free_txskb(&local->hw, skb);
1545 hdr = (struct ieee80211_hdr *) skb->data;
1546 info->control.vif = &sdata->vif;
1548 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1549 if (ieee80211_is_data(hdr->frame_control) &&
1550 is_unicast_ether_addr(hdr->addr1)) {
1551 if (mesh_nexthop_resolve(sdata, skb))
1552 return; /* skb queued: don't free */
1554 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1558 ieee80211_set_qos_hdr(sdata, skb);
1559 ieee80211_tx(sdata, sta, skb, false);
1562 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1564 struct ieee80211_radiotap_iterator iterator;
1565 struct ieee80211_radiotap_header *rthdr =
1566 (struct ieee80211_radiotap_header *) skb->data;
1567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1568 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1572 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1573 IEEE80211_TX_CTL_DONTFRAG;
1576 * for every radiotap entry that is present
1577 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1578 * entries present, or -EINVAL on error)
1582 ret = ieee80211_radiotap_iterator_next(&iterator);
1587 /* see if this argument is something we can use */
1588 switch (iterator.this_arg_index) {
1590 * You must take care when dereferencing iterator.this_arg
1591 * for multibyte types... the pointer is not aligned. Use
1592 * get_unaligned((type *)iterator.this_arg) to dereference
1593 * iterator.this_arg for type "type" safely on all arches.
1595 case IEEE80211_RADIOTAP_FLAGS:
1596 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1598 * this indicates that the skb we have been
1599 * handed has the 32-bit FCS CRC at the end...
1600 * we should react to that by snipping it off
1601 * because it will be recomputed and added
1604 if (skb->len < (iterator._max_length + FCS_LEN))
1607 skb_trim(skb, skb->len - FCS_LEN);
1609 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1610 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1611 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1612 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1615 case IEEE80211_RADIOTAP_TX_FLAGS:
1616 txflags = get_unaligned_le16(iterator.this_arg);
1617 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1618 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1622 * Please update the file
1623 * Documentation/networking/mac80211-injection.txt
1624 * when parsing new fields here.
1632 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1636 * remove the radiotap header
1637 * iterator->_max_length was sanity-checked against
1638 * skb->len by iterator init
1640 skb_pull(skb, iterator._max_length);
1645 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1646 struct net_device *dev)
1648 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1649 struct ieee80211_chanctx_conf *chanctx_conf;
1650 struct ieee80211_radiotap_header *prthdr =
1651 (struct ieee80211_radiotap_header *)skb->data;
1652 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1653 struct ieee80211_hdr *hdr;
1654 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1655 struct cfg80211_chan_def *chandef;
1659 /* check for not even having the fixed radiotap header part */
1660 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1661 goto fail; /* too short to be possibly valid */
1663 /* is it a header version we can trust to find length from? */
1664 if (unlikely(prthdr->it_version))
1665 goto fail; /* only version 0 is supported */
1667 /* then there must be a radiotap header with a length we can use */
1668 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1670 /* does the skb contain enough to deliver on the alleged length? */
1671 if (unlikely(skb->len < len_rthdr))
1672 goto fail; /* skb too short for claimed rt header extent */
1675 * fix up the pointers accounting for the radiotap
1676 * header still being in there. We are being given
1677 * a precooked IEEE80211 header so no need for
1680 skb_set_mac_header(skb, len_rthdr);
1682 * these are just fixed to the end of the rt area since we
1683 * don't have any better information and at this point, nobody cares
1685 skb_set_network_header(skb, len_rthdr);
1686 skb_set_transport_header(skb, len_rthdr);
1688 if (skb->len < len_rthdr + 2)
1691 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1692 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1694 if (skb->len < len_rthdr + hdrlen)
1698 * Initialize skb->protocol if the injected frame is a data frame
1699 * carrying a rfc1042 header
1701 if (ieee80211_is_data(hdr->frame_control) &&
1702 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1703 u8 *payload = (u8 *)hdr + hdrlen;
1705 if (ether_addr_equal(payload, rfc1042_header))
1706 skb->protocol = cpu_to_be16((payload[6] << 8) |
1710 memset(info, 0, sizeof(*info));
1712 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1713 IEEE80211_TX_CTL_INJECTED;
1715 /* process and remove the injection radiotap header */
1716 if (!ieee80211_parse_tx_radiotap(skb))
1722 * We process outgoing injected frames that have a local address
1723 * we handle as though they are non-injected frames.
1724 * This code here isn't entirely correct, the local MAC address
1725 * isn't always enough to find the interface to use; for proper
1726 * VLAN/WDS support we will need a different mechanism (which
1727 * likely isn't going to be monitor interfaces).
1729 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1731 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1732 if (!ieee80211_sdata_running(tmp_sdata))
1734 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1735 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1736 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1738 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1744 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1745 if (!chanctx_conf) {
1746 tmp_sdata = rcu_dereference(local->monitor_sdata);
1749 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1753 chandef = &chanctx_conf->def;
1754 else if (!local->use_chanctx)
1755 chandef = &local->_oper_chandef;
1760 * Frame injection is not allowed if beaconing is not allowed
1761 * or if we need radar detection. Beaconing is usually not allowed when
1762 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1763 * Passive scan is also used in world regulatory domains where
1764 * your country is not known and as such it should be treated as
1765 * NO TX unless the channel is explicitly allowed in which case
1766 * your current regulatory domain would not have the passive scan
1769 * Since AP mode uses monitor interfaces to inject/TX management
1770 * frames we can make AP mode the exception to this rule once it
1771 * supports radar detection as its implementation can deal with
1772 * radar detection by itself. We can do that later by adding a
1773 * monitor flag interfaces used for AP support.
1775 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1779 info->band = chandef->chan->band;
1780 ieee80211_xmit(sdata, NULL, skb);
1783 return NETDEV_TX_OK;
1789 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1793 * ieee80211_build_hdr - build 802.11 header in the given frame
1794 * @sdata: virtual interface to build the header for
1795 * @skb: the skb to build the header in
1796 * @info_flags: skb flags to set
1798 * This function takes the skb with 802.3 header and reformats the header to
1799 * the appropriate IEEE 802.11 header based on which interface the packet is
1800 * being transmitted on.
1802 * Note that this function also takes care of the TX status request and
1803 * potential unsharing of the SKB - this needs to be interleaved with the
1806 * The function requires the read-side RCU lock held
1808 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1810 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
1811 struct sk_buff *skb, u32 info_flags,
1812 struct sta_info **sta_out)
1814 struct ieee80211_local *local = sdata->local;
1815 struct ieee80211_tx_info *info;
1817 u16 ethertype, hdrlen, meshhdrlen = 0;
1819 struct ieee80211_hdr hdr;
1820 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1821 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1822 const u8 *encaps_data;
1823 int encaps_len, skip_header_bytes;
1825 struct sta_info *sta = NULL;
1826 bool wme_sta = false, authorized = false, tdls_auth = false;
1827 bool tdls_peer = false, tdls_setup_frame = false;
1829 bool have_station = false;
1831 struct ieee80211_chanctx_conf *chanctx_conf;
1832 struct ieee80211_sub_if_data *ap_sdata;
1833 enum ieee80211_band band;
1836 /* convert Ethernet header to proper 802.11 header (based on
1837 * operation mode) */
1838 ethertype = (skb->data[12] << 8) | skb->data[13];
1839 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1841 switch (sdata->vif.type) {
1842 case NL80211_IFTYPE_AP_VLAN:
1843 sta = rcu_dereference(sdata->u.vlan.sta);
1845 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1847 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1848 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1849 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1850 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1852 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1853 wme_sta = sta->sta.wme;
1854 have_station = true;
1856 } else if (sdata->wdev.use_4addr) {
1860 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1862 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1863 if (!chanctx_conf) {
1867 band = chanctx_conf->def.chan->band;
1871 case NL80211_IFTYPE_AP:
1872 if (sdata->vif.type == NL80211_IFTYPE_AP)
1873 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1874 if (!chanctx_conf) {
1878 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1880 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1881 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1882 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1884 band = chanctx_conf->def.chan->band;
1886 case NL80211_IFTYPE_WDS:
1887 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1889 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1890 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1891 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1892 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1895 * This is the exception! WDS style interfaces are prohibited
1896 * when channel contexts are in used so this must be valid
1898 band = local->hw.conf.chandef.chan->band;
1900 #ifdef CONFIG_MAC80211_MESH
1901 case NL80211_IFTYPE_MESH_POINT:
1902 if (!is_multicast_ether_addr(skb->data)) {
1903 struct sta_info *next_hop;
1904 bool mpp_lookup = true;
1906 mpath = mesh_path_lookup(sdata, skb->data);
1909 next_hop = rcu_dereference(mpath->next_hop);
1911 !(mpath->flags & (MESH_PATH_ACTIVE |
1912 MESH_PATH_RESOLVING)))
1917 mppath = mpp_path_lookup(sdata, skb->data);
1919 if (mppath && mpath)
1920 mesh_path_del(mpath->sdata, mpath->dst);
1924 * Use address extension if it is a packet from
1925 * another interface or if we know the destination
1926 * is being proxied by a portal (i.e. portal address
1927 * differs from proxied address)
1929 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1930 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1931 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1932 skb->data, skb->data + ETH_ALEN);
1933 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1936 /* DS -> MBSS (802.11-2012 13.11.3.3).
1937 * For unicast with unknown forwarding information,
1938 * destination might be in the MBSS or if that fails
1939 * forwarded to another mesh gate. In either case
1940 * resolution will be handled in ieee80211_xmit(), so
1941 * leave the original DA. This also works for mcast */
1942 const u8 *mesh_da = skb->data;
1945 mesh_da = mppath->mpp;
1947 mesh_da = mpath->dst;
1949 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1950 mesh_da, sdata->vif.addr);
1951 if (is_multicast_ether_addr(mesh_da))
1952 /* DA TA mSA AE:SA */
1953 meshhdrlen = ieee80211_new_mesh_header(
1955 skb->data + ETH_ALEN, NULL);
1957 /* RA TA mDA mSA AE:DA SA */
1958 meshhdrlen = ieee80211_new_mesh_header(
1959 sdata, &mesh_hdr, skb->data,
1960 skb->data + ETH_ALEN);
1963 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1964 if (!chanctx_conf) {
1968 band = chanctx_conf->def.chan->band;
1971 case NL80211_IFTYPE_STATION:
1972 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1973 sta = sta_info_get(sdata, skb->data);
1975 tdls_peer = test_sta_flag(sta,
1976 WLAN_STA_TDLS_PEER);
1977 tdls_auth = test_sta_flag(sta,
1978 WLAN_STA_TDLS_PEER_AUTH);
1983 ethertype == ETH_P_TDLS &&
1985 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1989 * TDLS link during setup - throw out frames to peer. We allow
1990 * TDLS-setup frames to unauthorized peers for the special case
1991 * of a link teardown after a TDLS sta is removed due to being
1994 if (tdls_peer && !tdls_auth && !tdls_setup_frame) {
1999 /* send direct packets to authorized TDLS peers */
2000 if (tdls_peer && tdls_auth) {
2002 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2003 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2004 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2006 have_station = true;
2007 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2008 wme_sta = sta->sta.wme;
2010 } else if (sdata->u.mgd.use_4addr &&
2011 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2012 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2013 IEEE80211_FCTL_TODS);
2015 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2016 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2017 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2018 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2021 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2023 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2024 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2025 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2028 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2029 if (!chanctx_conf) {
2033 band = chanctx_conf->def.chan->band;
2035 case NL80211_IFTYPE_OCB:
2037 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2038 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2039 eth_broadcast_addr(hdr.addr3);
2041 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2042 if (!chanctx_conf) {
2046 band = chanctx_conf->def.chan->band;
2048 case NL80211_IFTYPE_ADHOC:
2050 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2051 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2052 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2054 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2055 if (!chanctx_conf) {
2059 band = chanctx_conf->def.chan->band;
2067 * There's no need to try to look up the destination station
2068 * if it is a multicast address. In mesh, there's no need to
2069 * look up the station at all as it always must be QoS capable
2070 * and mesh mode checks authorization later.
2072 multicast = is_multicast_ether_addr(hdr.addr1);
2074 *sta_out = ERR_PTR(-ENOENT);
2075 } else if (!have_station && !ieee80211_vif_is_mesh(&sdata->vif)) {
2076 if (sdata->control_port_protocol == skb->protocol)
2077 sta = sta_info_get_bss(sdata, hdr.addr1);
2079 sta = sta_info_get(sdata, hdr.addr1);
2081 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2082 wme_sta = sta->sta.wme;
2084 *sta_out = sta ?: ERR_PTR(-ENOENT);
2087 /* For mesh, the use of the QoS header is mandatory */
2088 if (ieee80211_vif_is_mesh(&sdata->vif))
2091 /* receiver and we are QoS enabled, use a QoS type frame */
2092 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
2093 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2098 * Drop unicast frames to unauthorised stations unless they are
2099 * EAPOL frames from the local station.
2101 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2102 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2103 !multicast && !authorized &&
2104 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2105 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2106 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2107 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2108 sdata->name, hdr.addr1);
2111 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2117 if (unlikely(!multicast && skb->sk &&
2118 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2119 struct sk_buff *ack_skb = skb_clone_sk(skb);
2122 unsigned long flags;
2125 spin_lock_irqsave(&local->ack_status_lock, flags);
2126 id = idr_alloc(&local->ack_status_frames, ack_skb,
2127 1, 0x10000, GFP_ATOMIC);
2128 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2132 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2140 * If the skb is shared we need to obtain our own copy.
2142 if (skb_shared(skb)) {
2143 struct sk_buff *tmp_skb = skb;
2145 /* can't happen -- skb is a clone if info_id != 0 */
2148 skb = skb_clone(skb, GFP_ATOMIC);
2157 hdr.frame_control = fc;
2158 hdr.duration_id = 0;
2161 skip_header_bytes = ETH_HLEN;
2162 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2163 encaps_data = bridge_tunnel_header;
2164 encaps_len = sizeof(bridge_tunnel_header);
2165 skip_header_bytes -= 2;
2166 } else if (ethertype >= ETH_P_802_3_MIN) {
2167 encaps_data = rfc1042_header;
2168 encaps_len = sizeof(rfc1042_header);
2169 skip_header_bytes -= 2;
2175 nh_pos = skb_network_header(skb) - skb->data;
2176 h_pos = skb_transport_header(skb) - skb->data;
2178 skb_pull(skb, skip_header_bytes);
2179 nh_pos -= skip_header_bytes;
2180 h_pos -= skip_header_bytes;
2182 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2185 * So we need to modify the skb header and hence need a copy of
2186 * that. The head_need variable above doesn't, so far, include
2187 * the needed header space that we don't need right away. If we
2188 * can, then we don't reallocate right now but only after the
2189 * frame arrives at the master device (if it does...)
2191 * If we cannot, however, then we will reallocate to include all
2192 * the ever needed space. Also, if we need to reallocate it anyway,
2193 * make it big enough for everything we may ever need.
2196 if (head_need > 0 || skb_cloned(skb)) {
2197 head_need += sdata->encrypt_headroom;
2198 head_need += local->tx_headroom;
2199 head_need = max_t(int, 0, head_need);
2200 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2201 ieee80211_free_txskb(&local->hw, skb);
2203 return ERR_PTR(-ENOMEM);
2208 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2209 nh_pos += encaps_len;
2210 h_pos += encaps_len;
2213 #ifdef CONFIG_MAC80211_MESH
2214 if (meshhdrlen > 0) {
2215 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2216 nh_pos += meshhdrlen;
2217 h_pos += meshhdrlen;
2221 if (ieee80211_is_data_qos(fc)) {
2222 __le16 *qos_control;
2224 qos_control = (__le16 *) skb_push(skb, 2);
2225 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2227 * Maybe we could actually set some fields here, for now just
2228 * initialise to zero to indicate no special operation.
2232 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2237 /* Update skb pointers to various headers since this modified frame
2238 * is going to go through Linux networking code that may potentially
2239 * need things like pointer to IP header. */
2240 skb_set_mac_header(skb, 0);
2241 skb_set_network_header(skb, nh_pos);
2242 skb_set_transport_header(skb, h_pos);
2244 info = IEEE80211_SKB_CB(skb);
2245 memset(info, 0, sizeof(*info));
2247 info->flags = info_flags;
2248 info->ack_frame_id = info_id;
2254 return ERR_PTR(ret);
2257 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2258 struct net_device *dev,
2261 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2262 struct sta_info *sta = NULL;
2264 if (unlikely(skb->len < ETH_HLEN)) {
2271 skb = ieee80211_build_hdr(sdata, skb, info_flags, &sta);
2275 dev->stats.tx_packets++;
2276 dev->stats.tx_bytes += skb->len;
2277 dev->trans_start = jiffies;
2279 ieee80211_xmit(sdata, sta, skb);
2285 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2286 * @skb: packet to be sent
2287 * @dev: incoming interface
2289 * On failure skb will be freed.
2291 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
2292 struct net_device *dev)
2294 __ieee80211_subif_start_xmit(skb, dev, 0);
2295 return NETDEV_TX_OK;
2299 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
2300 struct sk_buff *skb, u32 info_flags)
2302 struct ieee80211_hdr *hdr;
2303 struct ieee80211_tx_data tx = {
2304 .local = sdata->local,
2307 struct sta_info *sta_ignore;
2311 skb = ieee80211_build_hdr(sdata, skb, info_flags, &sta_ignore);
2315 hdr = (void *)skb->data;
2316 tx.sta = sta_info_get(sdata, hdr->addr1);
2319 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
2322 return ERR_PTR(-EINVAL);
2331 * ieee80211_clear_tx_pending may not be called in a context where
2332 * it is possible that it packets could come in again.
2334 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2336 struct sk_buff *skb;
2339 for (i = 0; i < local->hw.queues; i++) {
2340 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2341 ieee80211_free_txskb(&local->hw, skb);
2346 * Returns false if the frame couldn't be transmitted but was queued instead,
2347 * which in this case means re-queued -- take as an indication to stop sending
2348 * more pending frames.
2350 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2351 struct sk_buff *skb)
2353 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2354 struct ieee80211_sub_if_data *sdata;
2355 struct sta_info *sta;
2356 struct ieee80211_hdr *hdr;
2358 struct ieee80211_chanctx_conf *chanctx_conf;
2360 sdata = vif_to_sdata(info->control.vif);
2362 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2363 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2364 if (unlikely(!chanctx_conf)) {
2368 info->band = chanctx_conf->def.chan->band;
2369 result = ieee80211_tx(sdata, NULL, skb, true);
2371 struct sk_buff_head skbs;
2373 __skb_queue_head_init(&skbs);
2374 __skb_queue_tail(&skbs, skb);
2376 hdr = (struct ieee80211_hdr *)skb->data;
2377 sta = sta_info_get(sdata, hdr->addr1);
2379 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2386 * Transmit all pending packets. Called from tasklet.
2388 void ieee80211_tx_pending(unsigned long data)
2390 struct ieee80211_local *local = (struct ieee80211_local *)data;
2391 unsigned long flags;
2397 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2398 for (i = 0; i < local->hw.queues; i++) {
2400 * If queue is stopped by something other than due to pending
2401 * frames, or we have no pending frames, proceed to next queue.
2403 if (local->queue_stop_reasons[i] ||
2404 skb_queue_empty(&local->pending[i]))
2407 while (!skb_queue_empty(&local->pending[i])) {
2408 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2409 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2411 if (WARN_ON(!info->control.vif)) {
2412 ieee80211_free_txskb(&local->hw, skb);
2416 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2419 txok = ieee80211_tx_pending_skb(local, skb);
2420 spin_lock_irqsave(&local->queue_stop_reason_lock,
2426 if (skb_queue_empty(&local->pending[i]))
2427 ieee80211_propagate_queue_wake(local, i);
2429 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2434 /* functions for drivers to get certain frames */
2436 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2437 struct ps_data *ps, struct sk_buff *skb,
2442 int i, have_bits = 0, n1, n2;
2444 /* Generate bitmap for TIM only if there are any STAs in power save
2446 if (atomic_read(&ps->num_sta_ps) > 0)
2447 /* in the hope that this is faster than
2448 * checking byte-for-byte */
2449 have_bits = !bitmap_empty((unsigned long *)ps->tim,
2450 IEEE80211_MAX_AID+1);
2452 if (ps->dtim_count == 0)
2453 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2458 tim = pos = (u8 *) skb_put(skb, 6);
2459 *pos++ = WLAN_EID_TIM;
2461 *pos++ = ps->dtim_count;
2462 *pos++ = sdata->vif.bss_conf.dtim_period;
2464 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2467 ps->dtim_bc_mc = aid0 == 1;
2470 /* Find largest even number N1 so that bits numbered 1 through
2471 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2472 * (N2 + 1) x 8 through 2007 are 0. */
2474 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2481 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2488 /* Bitmap control */
2490 /* Part Virt Bitmap */
2491 skb_put(skb, n2 - n1);
2492 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2494 tim[1] = n2 - n1 + 4;
2496 *pos++ = aid0; /* Bitmap control */
2497 *pos++ = 0; /* Part Virt Bitmap */
2501 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2502 struct ps_data *ps, struct sk_buff *skb,
2505 struct ieee80211_local *local = sdata->local;
2508 * Not very nice, but we want to allow the driver to call
2509 * ieee80211_beacon_get() as a response to the set_tim()
2510 * callback. That, however, is already invoked under the
2511 * sta_lock to guarantee consistent and race-free update
2512 * of the tim bitmap in mac80211 and the driver.
2514 if (local->tim_in_locked_section) {
2515 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2517 spin_lock_bh(&local->tim_lock);
2518 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2519 spin_unlock_bh(&local->tim_lock);
2525 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
2526 struct beacon_data *beacon)
2528 struct probe_resp *resp;
2530 size_t beacon_data_len;
2532 u8 count = beacon->csa_current_counter;
2534 switch (sdata->vif.type) {
2535 case NL80211_IFTYPE_AP:
2536 beacon_data = beacon->tail;
2537 beacon_data_len = beacon->tail_len;
2539 case NL80211_IFTYPE_ADHOC:
2540 beacon_data = beacon->head;
2541 beacon_data_len = beacon->head_len;
2543 case NL80211_IFTYPE_MESH_POINT:
2544 beacon_data = beacon->head;
2545 beacon_data_len = beacon->head_len;
2552 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
2553 resp = rcu_dereference(sdata->u.ap.probe_resp);
2555 if (beacon->csa_counter_offsets[i]) {
2556 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
2562 beacon_data[beacon->csa_counter_offsets[i]] = count;
2565 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
2566 resp->data[resp->csa_counter_offsets[i]] = count;
2571 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
2573 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2574 struct beacon_data *beacon = NULL;
2579 if (sdata->vif.type == NL80211_IFTYPE_AP)
2580 beacon = rcu_dereference(sdata->u.ap.beacon);
2581 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2582 beacon = rcu_dereference(sdata->u.ibss.presp);
2583 else if (ieee80211_vif_is_mesh(&sdata->vif))
2584 beacon = rcu_dereference(sdata->u.mesh.beacon);
2589 beacon->csa_current_counter--;
2591 /* the counter should never reach 0 */
2592 WARN_ON_ONCE(!beacon->csa_current_counter);
2593 count = beacon->csa_current_counter;
2599 EXPORT_SYMBOL(ieee80211_csa_update_counter);
2601 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
2603 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2604 struct beacon_data *beacon = NULL;
2606 size_t beacon_data_len;
2609 if (!ieee80211_sdata_running(sdata))
2613 if (vif->type == NL80211_IFTYPE_AP) {
2614 struct ieee80211_if_ap *ap = &sdata->u.ap;
2616 beacon = rcu_dereference(ap->beacon);
2617 if (WARN_ON(!beacon || !beacon->tail))
2619 beacon_data = beacon->tail;
2620 beacon_data_len = beacon->tail_len;
2621 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
2622 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2624 beacon = rcu_dereference(ifibss->presp);
2628 beacon_data = beacon->head;
2629 beacon_data_len = beacon->head_len;
2630 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
2631 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2633 beacon = rcu_dereference(ifmsh->beacon);
2637 beacon_data = beacon->head;
2638 beacon_data_len = beacon->head_len;
2644 if (!beacon->csa_counter_offsets[0])
2647 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
2650 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
2657 EXPORT_SYMBOL(ieee80211_csa_is_complete);
2659 static struct sk_buff *
2660 __ieee80211_beacon_get(struct ieee80211_hw *hw,
2661 struct ieee80211_vif *vif,
2662 struct ieee80211_mutable_offsets *offs,
2665 struct ieee80211_local *local = hw_to_local(hw);
2666 struct beacon_data *beacon = NULL;
2667 struct sk_buff *skb = NULL;
2668 struct ieee80211_tx_info *info;
2669 struct ieee80211_sub_if_data *sdata = NULL;
2670 enum ieee80211_band band;
2671 struct ieee80211_tx_rate_control txrc;
2672 struct ieee80211_chanctx_conf *chanctx_conf;
2673 int csa_off_base = 0;
2677 sdata = vif_to_sdata(vif);
2678 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2680 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2684 memset(offs, 0, sizeof(*offs));
2686 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2687 struct ieee80211_if_ap *ap = &sdata->u.ap;
2689 beacon = rcu_dereference(ap->beacon);
2691 if (beacon->csa_counter_offsets[0]) {
2693 ieee80211_csa_update_counter(vif);
2695 ieee80211_set_csa(sdata, beacon);
2699 * headroom, head length,
2700 * tail length and maximum TIM length
2702 skb = dev_alloc_skb(local->tx_headroom +
2704 beacon->tail_len + 256 +
2705 local->hw.extra_beacon_tailroom);
2709 skb_reserve(skb, local->tx_headroom);
2710 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2713 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
2717 offs->tim_offset = beacon->head_len;
2718 offs->tim_length = skb->len - beacon->head_len;
2720 /* for AP the csa offsets are from tail */
2721 csa_off_base = skb->len;
2725 memcpy(skb_put(skb, beacon->tail_len),
2726 beacon->tail, beacon->tail_len);
2729 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2730 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2731 struct ieee80211_hdr *hdr;
2733 beacon = rcu_dereference(ifibss->presp);
2737 if (beacon->csa_counter_offsets[0]) {
2739 ieee80211_csa_update_counter(vif);
2741 ieee80211_set_csa(sdata, beacon);
2744 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
2745 local->hw.extra_beacon_tailroom);
2748 skb_reserve(skb, local->tx_headroom);
2749 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2752 hdr = (struct ieee80211_hdr *) skb->data;
2753 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2754 IEEE80211_STYPE_BEACON);
2755 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2756 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2758 beacon = rcu_dereference(ifmsh->beacon);
2762 if (beacon->csa_counter_offsets[0]) {
2764 /* TODO: For mesh csa_counter is in TU, so
2765 * decrementing it by one isn't correct, but
2766 * for now we leave it consistent with overall
2767 * mac80211's behavior.
2769 ieee80211_csa_update_counter(vif);
2771 ieee80211_set_csa(sdata, beacon);
2774 if (ifmsh->sync_ops)
2775 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
2777 skb = dev_alloc_skb(local->tx_headroom +
2781 local->hw.extra_beacon_tailroom);
2784 skb_reserve(skb, local->tx_headroom);
2785 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2787 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
2790 offs->tim_offset = beacon->head_len;
2791 offs->tim_length = skb->len - beacon->head_len;
2794 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
2802 if (offs && beacon) {
2805 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
2806 u16 csa_off = beacon->csa_counter_offsets[i];
2811 offs->csa_counter_offs[i] = csa_off_base + csa_off;
2815 band = chanctx_conf->def.chan->band;
2817 info = IEEE80211_SKB_CB(skb);
2819 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2820 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2823 memset(&txrc, 0, sizeof(txrc));
2825 txrc.sband = local->hw.wiphy->bands[band];
2826 txrc.bss_conf = &sdata->vif.bss_conf;
2828 txrc.reported_rate.idx = -1;
2829 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2830 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2831 txrc.max_rate_idx = -1;
2833 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2835 rate_control_get_rate(sdata, NULL, &txrc);
2837 info->control.vif = vif;
2839 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2840 IEEE80211_TX_CTL_ASSIGN_SEQ |
2841 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2849 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
2850 struct ieee80211_vif *vif,
2851 struct ieee80211_mutable_offsets *offs)
2853 return __ieee80211_beacon_get(hw, vif, offs, true);
2855 EXPORT_SYMBOL(ieee80211_beacon_get_template);
2857 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2858 struct ieee80211_vif *vif,
2859 u16 *tim_offset, u16 *tim_length)
2861 struct ieee80211_mutable_offsets offs = {};
2862 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
2865 *tim_offset = offs.tim_offset;
2868 *tim_length = offs.tim_length;
2872 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2874 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2875 struct ieee80211_vif *vif)
2877 struct ieee80211_if_ap *ap = NULL;
2878 struct sk_buff *skb = NULL;
2879 struct probe_resp *presp = NULL;
2880 struct ieee80211_hdr *hdr;
2881 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2883 if (sdata->vif.type != NL80211_IFTYPE_AP)
2889 presp = rcu_dereference(ap->probe_resp);
2893 skb = dev_alloc_skb(presp->len);
2897 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2899 hdr = (struct ieee80211_hdr *) skb->data;
2900 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2906 EXPORT_SYMBOL(ieee80211_proberesp_get);
2908 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2909 struct ieee80211_vif *vif)
2911 struct ieee80211_sub_if_data *sdata;
2912 struct ieee80211_if_managed *ifmgd;
2913 struct ieee80211_pspoll *pspoll;
2914 struct ieee80211_local *local;
2915 struct sk_buff *skb;
2917 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2920 sdata = vif_to_sdata(vif);
2921 ifmgd = &sdata->u.mgd;
2922 local = sdata->local;
2924 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2928 skb_reserve(skb, local->hw.extra_tx_headroom);
2930 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2931 memset(pspoll, 0, sizeof(*pspoll));
2932 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2933 IEEE80211_STYPE_PSPOLL);
2934 pspoll->aid = cpu_to_le16(ifmgd->aid);
2936 /* aid in PS-Poll has its two MSBs each set to 1 */
2937 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2939 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2940 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2944 EXPORT_SYMBOL(ieee80211_pspoll_get);
2946 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2947 struct ieee80211_vif *vif)
2949 struct ieee80211_hdr_3addr *nullfunc;
2950 struct ieee80211_sub_if_data *sdata;
2951 struct ieee80211_if_managed *ifmgd;
2952 struct ieee80211_local *local;
2953 struct sk_buff *skb;
2955 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2958 sdata = vif_to_sdata(vif);
2959 ifmgd = &sdata->u.mgd;
2960 local = sdata->local;
2962 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2966 skb_reserve(skb, local->hw.extra_tx_headroom);
2968 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2970 memset(nullfunc, 0, sizeof(*nullfunc));
2971 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2972 IEEE80211_STYPE_NULLFUNC |
2973 IEEE80211_FCTL_TODS);
2974 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2975 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2976 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2980 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2982 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2984 const u8 *ssid, size_t ssid_len,
2987 struct ieee80211_local *local = hw_to_local(hw);
2988 struct ieee80211_hdr_3addr *hdr;
2989 struct sk_buff *skb;
2993 ie_ssid_len = 2 + ssid_len;
2995 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2996 ie_ssid_len + tailroom);
3000 skb_reserve(skb, local->hw.extra_tx_headroom);
3002 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3003 memset(hdr, 0, sizeof(*hdr));
3004 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3005 IEEE80211_STYPE_PROBE_REQ);
3006 eth_broadcast_addr(hdr->addr1);
3007 memcpy(hdr->addr2, src_addr, ETH_ALEN);
3008 eth_broadcast_addr(hdr->addr3);
3010 pos = skb_put(skb, ie_ssid_len);
3011 *pos++ = WLAN_EID_SSID;
3014 memcpy(pos, ssid, ssid_len);
3019 EXPORT_SYMBOL(ieee80211_probereq_get);
3021 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3022 const void *frame, size_t frame_len,
3023 const struct ieee80211_tx_info *frame_txctl,
3024 struct ieee80211_rts *rts)
3026 const struct ieee80211_hdr *hdr = frame;
3028 rts->frame_control =
3029 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3030 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3032 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3033 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3035 EXPORT_SYMBOL(ieee80211_rts_get);
3037 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3038 const void *frame, size_t frame_len,
3039 const struct ieee80211_tx_info *frame_txctl,
3040 struct ieee80211_cts *cts)
3042 const struct ieee80211_hdr *hdr = frame;
3044 cts->frame_control =
3045 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3046 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3047 frame_len, frame_txctl);
3048 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3050 EXPORT_SYMBOL(ieee80211_ctstoself_get);
3053 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3054 struct ieee80211_vif *vif)
3056 struct ieee80211_local *local = hw_to_local(hw);
3057 struct sk_buff *skb = NULL;
3058 struct ieee80211_tx_data tx;
3059 struct ieee80211_sub_if_data *sdata;
3061 struct ieee80211_tx_info *info;
3062 struct ieee80211_chanctx_conf *chanctx_conf;
3064 sdata = vif_to_sdata(vif);
3067 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3072 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3073 struct beacon_data *beacon =
3074 rcu_dereference(sdata->u.ap.beacon);
3076 if (!beacon || !beacon->head)
3079 ps = &sdata->u.ap.ps;
3080 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3081 ps = &sdata->u.mesh.ps;
3086 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3087 goto out; /* send buffered bc/mc only after DTIM beacon */
3090 skb = skb_dequeue(&ps->bc_buf);
3093 local->total_ps_buffered--;
3095 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3096 struct ieee80211_hdr *hdr =
3097 (struct ieee80211_hdr *) skb->data;
3098 /* more buffered multicast/broadcast frames ==> set
3099 * MoreData flag in IEEE 802.11 header to inform PS
3101 hdr->frame_control |=
3102 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3105 if (sdata->vif.type == NL80211_IFTYPE_AP)
3106 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3107 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
3109 dev_kfree_skb_any(skb);
3112 info = IEEE80211_SKB_CB(skb);
3114 tx.flags |= IEEE80211_TX_PS_BUFFERED;
3115 info->band = chanctx_conf->def.chan->band;
3117 if (invoke_tx_handlers(&tx))
3124 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3126 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3128 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3129 struct ieee80211_sub_if_data *sdata = sta->sdata;
3130 struct ieee80211_local *local = sdata->local;
3134 lockdep_assert_held(&local->sta_mtx);
3136 /* only some cases are supported right now */
3137 switch (sdata->vif.type) {
3138 case NL80211_IFTYPE_STATION:
3139 case NL80211_IFTYPE_AP:
3140 case NL80211_IFTYPE_AP_VLAN:
3147 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3150 if (sta->reserved_tid == tid) {
3155 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3156 sdata_err(sdata, "TID reservation already active\n");
3161 ieee80211_stop_vif_queues(sdata->local, sdata,
3162 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3166 /* Tear down BA sessions so we stop aggregating on this TID */
3167 if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) {
3168 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3169 __ieee80211_stop_tx_ba_session(sta, tid,
3170 AGG_STOP_LOCAL_REQUEST);
3173 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3174 __ieee80211_flush_queues(local, sdata, queues, false);
3176 sta->reserved_tid = tid;
3178 ieee80211_wake_vif_queues(local, sdata,
3179 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3181 if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)
3182 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3188 EXPORT_SYMBOL(ieee80211_reserve_tid);
3190 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3192 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3193 struct ieee80211_sub_if_data *sdata = sta->sdata;
3195 lockdep_assert_held(&sdata->local->sta_mtx);
3197 /* only some cases are supported right now */
3198 switch (sdata->vif.type) {
3199 case NL80211_IFTYPE_STATION:
3200 case NL80211_IFTYPE_AP:
3201 case NL80211_IFTYPE_AP_VLAN:
3208 if (tid != sta->reserved_tid) {
3209 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3213 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3215 EXPORT_SYMBOL(ieee80211_unreserve_tid);
3217 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3218 struct sk_buff *skb, int tid,
3219 enum ieee80211_band band)
3221 int ac = ieee802_1d_to_ac[tid & 7];
3223 skb_set_mac_header(skb, 0);
3224 skb_set_network_header(skb, 0);
3225 skb_set_transport_header(skb, 0);
3227 skb_set_queue_mapping(skb, ac);
3228 skb->priority = tid;
3230 skb->dev = sdata->dev;
3233 * The other path calling ieee80211_xmit is from the tasklet,
3234 * and while we can handle concurrent transmissions locking
3235 * requirements are that we do not come into tx with bhs on.
3238 IEEE80211_SKB_CB(skb)->band = band;
3239 ieee80211_xmit(sdata, NULL, skb);