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 <linux/time.h>
24 #include <net/net_namespace.h>
25 #include <net/ieee80211_radiotap.h>
26 #include <net/cfg80211.h>
27 #include <net/mac80211.h>
28 #include <asm/unaligned.h>
30 #include "ieee80211_i.h"
31 #include "driver-ops.h"
41 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
42 struct sk_buff *skb, int group_addr,
45 int rate, mrate, erp, dur, i, shift = 0;
46 struct ieee80211_rate *txrate;
47 struct ieee80211_local *local = tx->local;
48 struct ieee80211_supported_band *sband;
49 struct ieee80211_hdr *hdr;
50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
51 struct ieee80211_chanctx_conf *chanctx_conf;
55 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
57 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
58 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
62 /* assume HW handles this */
63 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
67 if (WARN_ON_ONCE(tx->rate.idx < 0))
70 sband = local->hw.wiphy->bands[info->band];
71 txrate = &sband->bitrates[tx->rate.idx];
73 erp = txrate->flags & IEEE80211_RATE_ERP_G;
76 * data and mgmt (except PS Poll):
78 * - during contention period:
79 * if addr1 is group address: 0
80 * if more fragments = 0 and addr1 is individual address: time to
81 * transmit one ACK plus SIFS
82 * if more fragments = 1 and addr1 is individual address: time to
83 * transmit next fragment plus 2 x ACK plus 3 x SIFS
86 * - control response frame (CTS or ACK) shall be transmitted using the
87 * same rate as the immediately previous frame in the frame exchange
88 * sequence, if this rate belongs to the PHY mandatory rates, or else
89 * at the highest possible rate belonging to the PHY rates in the
92 hdr = (struct ieee80211_hdr *)skb->data;
93 if (ieee80211_is_ctl(hdr->frame_control)) {
94 /* TODO: These control frames are not currently sent by
95 * mac80211, but should they be implemented, this function
96 * needs to be updated to support duration field calculation.
98 * RTS: time needed to transmit pending data/mgmt frame plus
99 * one CTS frame plus one ACK frame plus 3 x SIFS
100 * CTS: duration of immediately previous RTS minus time
101 * required to transmit CTS and its SIFS
102 * ACK: 0 if immediately previous directed data/mgmt had
103 * more=0, with more=1 duration in ACK frame is duration
104 * from previous frame minus time needed to transmit ACK
106 * PS Poll: BIT(15) | BIT(14) | aid
112 if (0 /* FIX: data/mgmt during CFP */)
113 return cpu_to_le16(32768);
115 if (group_addr) /* Group address as the destination - no ACK */
118 /* Individual destination address:
119 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
120 * CTS and ACK frames shall be transmitted using the highest rate in
121 * basic rate set that is less than or equal to the rate of the
122 * immediately previous frame and that is using the same modulation
123 * (CCK or OFDM). If no basic rate set matches with these requirements,
124 * the highest mandatory rate of the PHY that is less than or equal to
125 * the rate of the previous frame is used.
126 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
129 /* use lowest available if everything fails */
130 mrate = sband->bitrates[0].bitrate;
131 for (i = 0; i < sband->n_bitrates; i++) {
132 struct ieee80211_rate *r = &sband->bitrates[i];
134 if (r->bitrate > txrate->bitrate)
137 if ((rate_flags & r->flags) != rate_flags)
140 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
141 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
143 switch (sband->band) {
144 case IEEE80211_BAND_2GHZ: {
146 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
147 flag = IEEE80211_RATE_MANDATORY_G;
149 flag = IEEE80211_RATE_MANDATORY_B;
154 case IEEE80211_BAND_5GHZ:
155 if (r->flags & IEEE80211_RATE_MANDATORY_A)
158 case IEEE80211_BAND_60GHZ:
159 /* TODO, for now fall through */
160 case IEEE80211_NUM_BANDS:
166 /* No matching basic rate found; use highest suitable mandatory
168 rate = DIV_ROUND_UP(mrate, 1 << shift);
171 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
172 if (ieee80211_is_data_qos(hdr->frame_control) &&
173 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
176 /* Time needed to transmit ACK
177 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
178 * to closest integer */
179 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
180 tx->sdata->vif.bss_conf.use_short_preamble,
184 /* Frame is fragmented: duration increases with time needed to
185 * transmit next fragment plus ACK and 2 x SIFS. */
186 dur *= 2; /* ACK + SIFS */
188 dur += ieee80211_frame_duration(sband->band, next_frag_len,
189 txrate->bitrate, erp,
190 tx->sdata->vif.bss_conf.use_short_preamble,
194 return cpu_to_le16(dur);
198 static ieee80211_tx_result debug_noinline
199 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
201 struct ieee80211_local *local = tx->local;
202 struct ieee80211_if_managed *ifmgd;
204 /* driver doesn't support power save */
205 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
208 /* hardware does dynamic power save */
209 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
212 /* dynamic power save disabled */
213 if (local->hw.conf.dynamic_ps_timeout <= 0)
216 /* we are scanning, don't enable power save */
220 if (!local->ps_sdata)
223 /* No point if we're going to suspend */
224 if (local->quiescing)
227 /* dynamic ps is supported only in managed mode */
228 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
231 ifmgd = &tx->sdata->u.mgd;
234 * Don't wakeup from power save if u-apsd is enabled, voip ac has
235 * u-apsd enabled and the frame is in voip class. This effectively
236 * means that even if all access categories have u-apsd enabled, in
237 * practise u-apsd is only used with the voip ac. This is a
238 * workaround for the case when received voip class packets do not
239 * have correct qos tag for some reason, due the network or the
242 * Note: ifmgd->uapsd_queues access is racy here. If the value is
243 * changed via debugfs, user needs to reassociate manually to have
244 * everything in sync.
246 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
247 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
248 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
251 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
252 ieee80211_stop_queues_by_reason(&local->hw,
253 IEEE80211_MAX_QUEUE_MAP,
254 IEEE80211_QUEUE_STOP_REASON_PS,
256 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
257 ieee80211_queue_work(&local->hw,
258 &local->dynamic_ps_disable_work);
261 /* Don't restart the timer if we're not disassociated */
262 if (!ifmgd->associated)
265 mod_timer(&local->dynamic_ps_timer, jiffies +
266 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
271 static ieee80211_tx_result debug_noinline
272 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
275 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
276 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
279 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
282 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
283 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
284 !ieee80211_is_probe_req(hdr->frame_control) &&
285 !ieee80211_is_nullfunc(hdr->frame_control))
287 * When software scanning only nullfunc frames (to notify
288 * the sleep state to the AP) and probe requests (for the
289 * active scan) are allowed, all other frames should not be
290 * sent and we should not get here, but if we do
291 * nonetheless, drop them to avoid sending them
292 * off-channel. See the link below and
293 * ieee80211_start_scan() for more.
295 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
299 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
302 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
305 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
308 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
312 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
314 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
315 if (unlikely(!assoc &&
316 ieee80211_is_data(hdr->frame_control))) {
317 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
318 sdata_info(tx->sdata,
319 "dropped data frame to not associated station %pM\n",
322 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
325 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
326 ieee80211_is_data(hdr->frame_control) &&
327 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
329 * No associated STAs - no need to send multicast
338 /* This function is called whenever the AP is about to exceed the maximum limit
339 * of buffered frames for power saving STAs. This situation should not really
340 * happen often during normal operation, so dropping the oldest buffered packet
341 * from each queue should be OK to make some room for new frames. */
342 static void purge_old_ps_buffers(struct ieee80211_local *local)
344 int total = 0, purged = 0;
346 struct ieee80211_sub_if_data *sdata;
347 struct sta_info *sta;
349 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
352 if (sdata->vif.type == NL80211_IFTYPE_AP)
353 ps = &sdata->u.ap.ps;
354 else if (ieee80211_vif_is_mesh(&sdata->vif))
355 ps = &sdata->u.mesh.ps;
359 skb = skb_dequeue(&ps->bc_buf);
364 total += skb_queue_len(&ps->bc_buf);
368 * Drop one frame from each station from the lowest-priority
369 * AC that has frames at all.
371 list_for_each_entry_rcu(sta, &local->sta_list, list) {
374 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
375 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
376 total += skb_queue_len(&sta->ps_tx_buf[ac]);
379 ieee80211_free_txskb(&local->hw, skb);
385 local->total_ps_buffered = total;
386 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
389 static ieee80211_tx_result
390 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
392 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
393 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
397 * broadcast/multicast frame
399 * If any of the associated/peer stations is in power save mode,
400 * the frame is buffered to be sent after DTIM beacon frame.
401 * This is done either by the hardware or us.
404 /* powersaving STAs currently only in AP/VLAN/mesh mode */
405 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
406 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
410 ps = &tx->sdata->bss->ps;
411 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
412 ps = &tx->sdata->u.mesh.ps;
418 /* no buffering for ordered frames */
419 if (ieee80211_has_order(hdr->frame_control))
422 if (ieee80211_is_probe_req(hdr->frame_control))
425 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
426 info->hw_queue = tx->sdata->vif.cab_queue;
428 /* no stations in PS mode */
429 if (!atomic_read(&ps->num_sta_ps))
432 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
434 /* device releases frame after DTIM beacon */
435 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
438 /* buffered in mac80211 */
439 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
440 purge_old_ps_buffers(tx->local);
442 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
444 "BC TX buffer full - dropping the oldest frame\n");
445 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
447 tx->local->total_ps_buffered++;
449 skb_queue_tail(&ps->bc_buf, tx->skb);
454 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
457 if (!ieee80211_is_mgmt(fc))
460 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
463 if (!ieee80211_is_robust_mgmt_frame(skb))
469 static ieee80211_tx_result
470 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
472 struct sta_info *sta = tx->sta;
473 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
474 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
475 struct ieee80211_local *local = tx->local;
480 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
481 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
482 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
483 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
484 int ac = skb_get_queue_mapping(tx->skb);
486 if (ieee80211_is_mgmt(hdr->frame_control) &&
487 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
488 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
492 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
493 sta->sta.addr, sta->sta.aid, ac);
494 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
495 purge_old_ps_buffers(tx->local);
497 /* sync with ieee80211_sta_ps_deliver_wakeup */
498 spin_lock(&sta->ps_lock);
500 * STA woke up the meantime and all the frames on ps_tx_buf have
501 * been queued to pending queue. No reordering can happen, go
502 * ahead and Tx the packet.
504 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
505 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
506 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
507 spin_unlock(&sta->ps_lock);
511 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
512 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
514 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
516 ieee80211_free_txskb(&local->hw, old);
518 tx->local->total_ps_buffered++;
520 info->control.jiffies = jiffies;
521 info->control.vif = &tx->sdata->vif;
522 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
523 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
524 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
525 spin_unlock(&sta->ps_lock);
527 if (!timer_pending(&local->sta_cleanup))
528 mod_timer(&local->sta_cleanup,
529 round_jiffies(jiffies +
530 STA_INFO_CLEANUP_INTERVAL));
533 * We queued up some frames, so the TIM bit might
534 * need to be set, recalculate it.
536 sta_info_recalc_tim(sta);
539 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
541 "STA %pM in PS mode, but polling/in SP -> send frame\n",
548 static ieee80211_tx_result debug_noinline
549 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
551 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
554 if (tx->flags & IEEE80211_TX_UNICAST)
555 return ieee80211_tx_h_unicast_ps_buf(tx);
557 return ieee80211_tx_h_multicast_ps_buf(tx);
560 static ieee80211_tx_result debug_noinline
561 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
563 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
565 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
566 if (tx->sdata->control_port_no_encrypt)
567 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
568 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
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)))
597 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
599 else if (!tx->sdata->drop_unencrypted)
601 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
603 else if (ieee80211_is_robust_mgmt_frame(tx->skb) &&
604 !(ieee80211_is_action(hdr->frame_control) &&
605 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
607 else if (ieee80211_is_mgmt(hdr->frame_control) &&
608 !ieee80211_is_robust_mgmt_frame(tx->skb))
611 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
616 bool skip_hw = false;
618 tx->key->tx_rx_count++;
619 /* TODO: add threshold stuff again */
621 switch (tx->key->conf.cipher) {
622 case WLAN_CIPHER_SUITE_WEP40:
623 case WLAN_CIPHER_SUITE_WEP104:
624 case WLAN_CIPHER_SUITE_TKIP:
625 if (!ieee80211_is_data_present(hdr->frame_control))
628 case WLAN_CIPHER_SUITE_CCMP:
629 if (!ieee80211_is_data_present(hdr->frame_control) &&
630 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
634 skip_hw = (tx->key->conf.flags &
635 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
636 ieee80211_is_mgmt(hdr->frame_control);
638 case WLAN_CIPHER_SUITE_AES_CMAC:
639 if (!ieee80211_is_mgmt(hdr->frame_control))
644 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
645 !ieee80211_is_deauth(hdr->frame_control)))
648 if (!skip_hw && tx->key &&
649 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
650 info->control.hw_key = &tx->key->conf;
656 static ieee80211_tx_result debug_noinline
657 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
659 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
660 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
661 struct ieee80211_supported_band *sband;
663 struct ieee80211_tx_rate_control txrc;
664 struct ieee80211_sta_rates *ratetbl = NULL;
667 memset(&txrc, 0, sizeof(txrc));
669 sband = tx->local->hw.wiphy->bands[info->band];
671 len = min_t(u32, tx->skb->len + FCS_LEN,
672 tx->local->hw.wiphy->frag_threshold);
674 /* set up the tx rate control struct we give the RC algo */
675 txrc.hw = &tx->local->hw;
677 txrc.bss_conf = &tx->sdata->vif.bss_conf;
679 txrc.reported_rate.idx = -1;
680 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
681 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
682 txrc.max_rate_idx = -1;
684 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
686 if (tx->sdata->rc_has_mcs_mask[info->band])
687 txrc.rate_idx_mcs_mask =
688 tx->sdata->rc_rateidx_mcs_mask[info->band];
690 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
691 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
692 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
694 /* set up RTS protection if desired */
695 if (len > tx->local->hw.wiphy->rts_threshold) {
699 info->control.use_rts = txrc.rts;
700 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
703 * Use short preamble if the BSS can handle it, but not for
704 * management frames unless we know the receiver can handle
705 * that -- the management frame might be to a station that
706 * just wants a probe response.
708 if (tx->sdata->vif.bss_conf.use_short_preamble &&
709 (ieee80211_is_data(hdr->frame_control) ||
710 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
711 txrc.short_preamble = true;
713 info->control.short_preamble = txrc.short_preamble;
716 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
719 * Lets not bother rate control if we're associated and cannot
720 * talk to the sta. This should not happen.
722 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
723 !rate_usable_index_exists(sband, &tx->sta->sta),
724 "%s: Dropped data frame as no usable bitrate found while "
725 "scanning and associated. Target station: "
726 "%pM on %d GHz band\n",
727 tx->sdata->name, hdr->addr1,
732 * If we're associated with the sta at this point we know we can at
733 * least send the frame at the lowest bit rate.
735 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
737 if (tx->sta && !info->control.skip_table)
738 ratetbl = rcu_dereference(tx->sta->sta.rates);
740 if (unlikely(info->control.rates[0].idx < 0)) {
742 struct ieee80211_tx_rate rate = {
743 .idx = ratetbl->rate[0].idx,
744 .flags = ratetbl->rate[0].flags,
745 .count = ratetbl->rate[0].count
748 if (ratetbl->rate[0].idx < 0)
756 tx->rate = info->control.rates[0];
759 if (txrc.reported_rate.idx < 0) {
760 txrc.reported_rate = tx->rate;
761 if (tx->sta && ieee80211_is_data(hdr->frame_control))
762 tx->sta->last_tx_rate = txrc.reported_rate;
764 tx->sta->last_tx_rate = txrc.reported_rate;
769 if (unlikely(!info->control.rates[0].count))
770 info->control.rates[0].count = 1;
772 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
773 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
774 info->control.rates[0].count = 1;
779 static ieee80211_tx_result debug_noinline
780 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
782 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
783 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
789 * Packet injection may want to control the sequence
790 * number, if we have no matching interface then we
791 * neither assign one ourselves nor ask the driver to.
793 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
796 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
799 if (ieee80211_hdrlen(hdr->frame_control) < 24)
802 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
806 * Anything but QoS data that has a sequence number field
807 * (is long enough) gets a sequence number from the global
808 * counter. QoS data frames with a multicast destination
809 * also use the global counter (802.11-2012 9.3.2.10).
811 if (!ieee80211_is_data_qos(hdr->frame_control) ||
812 is_multicast_ether_addr(hdr->addr1)) {
813 /* driver should assign sequence number */
814 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
815 /* for pure STA mode without beacons, we can do it */
816 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
817 tx->sdata->sequence_number += 0x10;
819 tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++;
824 * This should be true for injected/management frames only, for
825 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
826 * above since they are not QoS-data frames.
831 /* include per-STA, per-TID sequence counter */
833 qc = ieee80211_get_qos_ctl(hdr);
834 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
835 seq = &tx->sta->tid_seq[tid];
836 tx->sta->tx_msdu[tid]++;
838 hdr->seq_ctrl = cpu_to_le16(*seq);
840 /* Increase the sequence number. */
841 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
846 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
847 struct sk_buff *skb, int hdrlen,
850 struct ieee80211_local *local = tx->local;
851 struct ieee80211_tx_info *info;
853 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
854 int pos = hdrlen + per_fragm;
855 int rem = skb->len - hdrlen - per_fragm;
857 if (WARN_ON(rem < 0))
860 /* first fragment was already added to queue by caller */
863 int fraglen = per_fragm;
868 tmp = dev_alloc_skb(local->tx_headroom +
870 tx->sdata->encrypt_headroom +
871 IEEE80211_ENCRYPT_TAILROOM);
875 __skb_queue_tail(&tx->skbs, tmp);
878 local->tx_headroom + tx->sdata->encrypt_headroom);
880 /* copy control information */
881 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
883 info = IEEE80211_SKB_CB(tmp);
884 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
885 IEEE80211_TX_CTL_FIRST_FRAGMENT);
888 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
890 skb_copy_queue_mapping(tmp, skb);
891 tmp->priority = skb->priority;
894 /* copy header and data */
895 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
896 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
901 /* adjust first fragment's length */
902 skb_trim(skb, hdrlen + per_fragm);
906 static ieee80211_tx_result debug_noinline
907 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
909 struct sk_buff *skb = tx->skb;
910 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
911 struct ieee80211_hdr *hdr = (void *)skb->data;
912 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
916 /* no matter what happens, tx->skb moves to tx->skbs */
917 __skb_queue_tail(&tx->skbs, skb);
920 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
923 if (tx->local->ops->set_frag_threshold)
927 * Warn when submitting a fragmented A-MPDU frame and drop it.
928 * This scenario is handled in ieee80211_tx_prepare but extra
929 * caution taken here as fragmented ampdu may cause Tx stop.
931 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
934 hdrlen = ieee80211_hdrlen(hdr->frame_control);
936 /* internal error, why isn't DONTFRAG set? */
937 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
941 * Now fragment the frame. This will allocate all the fragments and
942 * chain them (using skb as the first fragment) to skb->next.
943 * During transmission, we will remove the successfully transmitted
944 * fragments from this list. When the low-level driver rejects one
945 * of the fragments then we will simply pretend to accept the skb
946 * but store it away as pending.
948 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
951 /* update duration/seq/flags of fragments */
954 skb_queue_walk(&tx->skbs, skb) {
955 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
957 hdr = (void *)skb->data;
958 info = IEEE80211_SKB_CB(skb);
960 if (!skb_queue_is_last(&tx->skbs, skb)) {
961 hdr->frame_control |= morefrags;
963 * No multi-rate retries for fragmented frames, that
964 * would completely throw off the NAV at other STAs.
966 info->control.rates[1].idx = -1;
967 info->control.rates[2].idx = -1;
968 info->control.rates[3].idx = -1;
969 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
970 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
972 hdr->frame_control &= ~morefrags;
974 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
981 static ieee80211_tx_result debug_noinline
982 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
990 skb_queue_walk(&tx->skbs, skb) {
991 ac = skb_get_queue_mapping(skb);
992 tx->sta->tx_fragments++;
993 tx->sta->tx_bytes[ac] += skb->len;
996 tx->sta->tx_packets[ac]++;
1001 static ieee80211_tx_result debug_noinline
1002 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1007 switch (tx->key->conf.cipher) {
1008 case WLAN_CIPHER_SUITE_WEP40:
1009 case WLAN_CIPHER_SUITE_WEP104:
1010 return ieee80211_crypto_wep_encrypt(tx);
1011 case WLAN_CIPHER_SUITE_TKIP:
1012 return ieee80211_crypto_tkip_encrypt(tx);
1013 case WLAN_CIPHER_SUITE_CCMP:
1014 return ieee80211_crypto_ccmp_encrypt(tx);
1015 case WLAN_CIPHER_SUITE_AES_CMAC:
1016 return ieee80211_crypto_aes_cmac_encrypt(tx);
1018 return ieee80211_crypto_hw_encrypt(tx);
1024 static ieee80211_tx_result debug_noinline
1025 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1027 struct sk_buff *skb;
1028 struct ieee80211_hdr *hdr;
1032 skb_queue_walk(&tx->skbs, skb) {
1033 hdr = (void *) skb->data;
1034 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1035 break; /* must not overwrite AID */
1036 if (!skb_queue_is_last(&tx->skbs, skb)) {
1037 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1038 next_len = next->len;
1041 group_addr = is_multicast_ether_addr(hdr->addr1);
1044 ieee80211_duration(tx, skb, group_addr, next_len);
1050 /* actual transmit path */
1052 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1053 struct sk_buff *skb,
1054 struct ieee80211_tx_info *info,
1055 struct tid_ampdu_tx *tid_tx,
1058 bool queued = false;
1059 bool reset_agg_timer = false;
1060 struct sk_buff *purge_skb = NULL;
1062 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1063 info->flags |= IEEE80211_TX_CTL_AMPDU;
1064 reset_agg_timer = true;
1065 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1067 * nothing -- this aggregation session is being started
1068 * but that might still fail with the driver
1071 spin_lock(&tx->sta->lock);
1073 * Need to re-check now, because we may get here
1075 * 1) in the window during which the setup is actually
1076 * already done, but not marked yet because not all
1077 * packets are spliced over to the driver pending
1078 * queue yet -- if this happened we acquire the lock
1079 * either before or after the splice happens, but
1080 * need to recheck which of these cases happened.
1082 * 2) during session teardown, if the OPERATIONAL bit
1083 * was cleared due to the teardown but the pointer
1084 * hasn't been assigned NULL yet (or we loaded it
1085 * before it was assigned) -- in this case it may
1086 * now be NULL which means we should just let the
1087 * packet pass through because splicing the frames
1088 * back is already done.
1090 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1093 /* do nothing, let packet pass through */
1094 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1095 info->flags |= IEEE80211_TX_CTL_AMPDU;
1096 reset_agg_timer = true;
1099 info->control.vif = &tx->sdata->vif;
1100 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1101 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1102 __skb_queue_tail(&tid_tx->pending, skb);
1103 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1104 purge_skb = __skb_dequeue(&tid_tx->pending);
1106 spin_unlock(&tx->sta->lock);
1109 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1112 /* reset session timer */
1113 if (reset_agg_timer && tid_tx->timeout)
1114 tid_tx->last_tx = jiffies;
1122 static ieee80211_tx_result
1123 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1124 struct ieee80211_tx_data *tx,
1125 struct sk_buff *skb)
1127 struct ieee80211_local *local = sdata->local;
1128 struct ieee80211_hdr *hdr;
1129 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1133 memset(tx, 0, sizeof(*tx));
1137 __skb_queue_head_init(&tx->skbs);
1140 * If this flag is set to true anywhere, and we get here,
1141 * we are doing the needed processing, so remove the flag
1144 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1146 hdr = (struct ieee80211_hdr *) skb->data;
1148 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1149 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1150 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1152 } else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
1153 IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1154 tx->sdata->control_port_protocol == tx->skb->protocol) {
1155 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1158 tx->sta = sta_info_get(sdata, hdr->addr1);
1160 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1161 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1162 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1163 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1164 struct tid_ampdu_tx *tid_tx;
1166 qc = ieee80211_get_qos_ctl(hdr);
1167 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1169 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1173 queued = ieee80211_tx_prep_agg(tx, skb, info,
1176 if (unlikely(queued))
1181 if (is_multicast_ether_addr(hdr->addr1)) {
1182 tx->flags &= ~IEEE80211_TX_UNICAST;
1183 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1185 tx->flags |= IEEE80211_TX_UNICAST;
1187 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1188 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1189 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1190 info->flags & IEEE80211_TX_CTL_AMPDU)
1191 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1195 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1196 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1197 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1199 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1204 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1205 struct ieee80211_vif *vif,
1206 struct ieee80211_sta *sta,
1207 struct sk_buff_head *skbs,
1210 struct ieee80211_tx_control control;
1211 struct sk_buff *skb, *tmp;
1212 unsigned long flags;
1214 skb_queue_walk_safe(skbs, skb, tmp) {
1215 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1216 int q = info->hw_queue;
1218 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1219 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1220 __skb_unlink(skb, skbs);
1221 ieee80211_free_txskb(&local->hw, skb);
1226 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1227 if (local->queue_stop_reasons[q] ||
1228 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1229 if (unlikely(info->flags &
1230 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1231 if (local->queue_stop_reasons[q] &
1232 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1234 * Drop off-channel frames if queues
1235 * are stopped for any reason other
1236 * than off-channel operation. Never
1239 spin_unlock_irqrestore(
1240 &local->queue_stop_reason_lock,
1242 ieee80211_purge_tx_queue(&local->hw,
1249 * Since queue is stopped, queue up frames for
1250 * later transmission from the tx-pending
1251 * tasklet when the queue is woken again.
1254 skb_queue_splice_init(skbs,
1255 &local->pending[q]);
1257 skb_queue_splice_tail_init(skbs,
1258 &local->pending[q]);
1260 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1265 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1267 info->control.vif = vif;
1270 __skb_unlink(skb, skbs);
1271 drv_tx(local, &control, skb);
1278 * Returns false if the frame couldn't be transmitted but was queued instead.
1280 static bool __ieee80211_tx(struct ieee80211_local *local,
1281 struct sk_buff_head *skbs, int led_len,
1282 struct sta_info *sta, bool txpending)
1284 struct ieee80211_tx_info *info;
1285 struct ieee80211_sub_if_data *sdata;
1286 struct ieee80211_vif *vif;
1287 struct ieee80211_sta *pubsta;
1288 struct sk_buff *skb;
1292 if (WARN_ON(skb_queue_empty(skbs)))
1295 skb = skb_peek(skbs);
1296 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1297 info = IEEE80211_SKB_CB(skb);
1298 sdata = vif_to_sdata(info->control.vif);
1299 if (sta && !sta->uploaded)
1307 switch (sdata->vif.type) {
1308 case NL80211_IFTYPE_MONITOR:
1309 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1313 sdata = rcu_dereference(local->monitor_sdata);
1317 vif->hw_queue[skb_get_queue_mapping(skb)];
1318 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1324 case NL80211_IFTYPE_AP_VLAN:
1325 sdata = container_of(sdata->bss,
1326 struct ieee80211_sub_if_data, u.ap);
1333 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1336 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1338 WARN_ON_ONCE(!skb_queue_empty(skbs));
1344 * Invoke TX handlers, return 0 on success and non-zero if the
1345 * frame was dropped or queued.
1347 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1349 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1350 ieee80211_tx_result res = TX_DROP;
1352 #define CALL_TXH(txh) \
1355 if (res != TX_CONTINUE) \
1359 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1360 CALL_TXH(ieee80211_tx_h_check_assoc);
1361 CALL_TXH(ieee80211_tx_h_ps_buf);
1362 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1363 CALL_TXH(ieee80211_tx_h_select_key);
1364 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1365 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1367 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1368 __skb_queue_tail(&tx->skbs, tx->skb);
1373 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1374 CALL_TXH(ieee80211_tx_h_sequence);
1375 CALL_TXH(ieee80211_tx_h_fragment);
1376 /* handlers after fragment must be aware of tx info fragmentation! */
1377 CALL_TXH(ieee80211_tx_h_stats);
1378 CALL_TXH(ieee80211_tx_h_encrypt);
1379 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1380 CALL_TXH(ieee80211_tx_h_calculate_duration);
1384 if (unlikely(res == TX_DROP)) {
1385 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1387 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1389 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1391 } else if (unlikely(res == TX_QUEUED)) {
1392 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1399 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1400 struct ieee80211_vif *vif, struct sk_buff *skb,
1401 int band, struct ieee80211_sta **sta)
1403 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1404 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1405 struct ieee80211_tx_data tx;
1407 if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP)
1411 info->control.vif = vif;
1412 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1414 if (invoke_tx_handlers(&tx))
1419 *sta = &tx.sta->sta;
1426 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1429 * Returns false if the frame couldn't be transmitted but was queued instead.
1431 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1432 struct sk_buff *skb, bool txpending)
1434 struct ieee80211_local *local = sdata->local;
1435 struct ieee80211_tx_data tx;
1436 ieee80211_tx_result res_prepare;
1437 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1441 if (unlikely(skb->len < 10)) {
1446 /* initialises tx */
1448 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1450 if (unlikely(res_prepare == TX_DROP)) {
1451 ieee80211_free_txskb(&local->hw, skb);
1453 } else if (unlikely(res_prepare == TX_QUEUED)) {
1457 /* set up hw_queue value early */
1458 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1459 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1461 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1463 if (!invoke_tx_handlers(&tx))
1464 result = __ieee80211_tx(local, &tx.skbs, led_len,
1470 /* device xmit handlers */
1472 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1473 struct sk_buff *skb,
1474 int head_need, bool may_encrypt)
1476 struct ieee80211_local *local = sdata->local;
1479 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1480 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1481 tail_need -= skb_tailroom(skb);
1482 tail_need = max_t(int, tail_need, 0);
1485 if (skb_cloned(skb) &&
1486 (!(local->hw.flags & IEEE80211_HW_SUPPORTS_CLONED_SKBS) ||
1487 !skb_clone_writable(skb, ETH_HLEN) ||
1488 sdata->crypto_tx_tailroom_needed_cnt))
1489 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1490 else if (head_need || tail_need)
1491 I802_DEBUG_INC(local->tx_expand_skb_head);
1495 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1496 wiphy_debug(local->hw.wiphy,
1497 "failed to reallocate TX buffer\n");
1504 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1506 struct ieee80211_local *local = sdata->local;
1507 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1508 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1512 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1514 headroom = local->tx_headroom;
1516 headroom += sdata->encrypt_headroom;
1517 headroom -= skb_headroom(skb);
1518 headroom = max_t(int, 0, headroom);
1520 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1521 ieee80211_free_txskb(&local->hw, skb);
1525 hdr = (struct ieee80211_hdr *) skb->data;
1526 info->control.vif = &sdata->vif;
1528 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1529 if (ieee80211_is_data(hdr->frame_control) &&
1530 is_unicast_ether_addr(hdr->addr1)) {
1531 if (mesh_nexthop_resolve(sdata, skb))
1532 return; /* skb queued: don't free */
1534 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1538 ieee80211_set_qos_hdr(sdata, skb);
1539 ieee80211_tx(sdata, skb, false);
1542 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1544 struct ieee80211_radiotap_iterator iterator;
1545 struct ieee80211_radiotap_header *rthdr =
1546 (struct ieee80211_radiotap_header *) skb->data;
1547 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1548 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1552 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1553 IEEE80211_TX_CTL_DONTFRAG;
1556 * for every radiotap entry that is present
1557 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1558 * entries present, or -EINVAL on error)
1562 ret = ieee80211_radiotap_iterator_next(&iterator);
1567 /* see if this argument is something we can use */
1568 switch (iterator.this_arg_index) {
1570 * You must take care when dereferencing iterator.this_arg
1571 * for multibyte types... the pointer is not aligned. Use
1572 * get_unaligned((type *)iterator.this_arg) to dereference
1573 * iterator.this_arg for type "type" safely on all arches.
1575 case IEEE80211_RADIOTAP_FLAGS:
1576 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1578 * this indicates that the skb we have been
1579 * handed has the 32-bit FCS CRC at the end...
1580 * we should react to that by snipping it off
1581 * because it will be recomputed and added
1584 if (skb->len < (iterator._max_length + FCS_LEN))
1587 skb_trim(skb, skb->len - FCS_LEN);
1589 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1590 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1591 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1592 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1595 case IEEE80211_RADIOTAP_TX_FLAGS:
1596 txflags = get_unaligned_le16(iterator.this_arg);
1597 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1598 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1602 * Please update the file
1603 * Documentation/networking/mac80211-injection.txt
1604 * when parsing new fields here.
1612 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1616 * remove the radiotap header
1617 * iterator->_max_length was sanity-checked against
1618 * skb->len by iterator init
1620 skb_pull(skb, iterator._max_length);
1625 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1626 struct net_device *dev)
1628 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1629 struct ieee80211_chanctx_conf *chanctx_conf;
1630 struct ieee80211_radiotap_header *prthdr =
1631 (struct ieee80211_radiotap_header *)skb->data;
1632 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1633 struct ieee80211_hdr *hdr;
1634 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1635 struct cfg80211_chan_def *chandef;
1639 /* check for not even having the fixed radiotap header part */
1640 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1641 goto fail; /* too short to be possibly valid */
1643 /* is it a header version we can trust to find length from? */
1644 if (unlikely(prthdr->it_version))
1645 goto fail; /* only version 0 is supported */
1647 /* then there must be a radiotap header with a length we can use */
1648 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1650 /* does the skb contain enough to deliver on the alleged length? */
1651 if (unlikely(skb->len < len_rthdr))
1652 goto fail; /* skb too short for claimed rt header extent */
1655 * fix up the pointers accounting for the radiotap
1656 * header still being in there. We are being given
1657 * a precooked IEEE80211 header so no need for
1660 skb_set_mac_header(skb, len_rthdr);
1662 * these are just fixed to the end of the rt area since we
1663 * don't have any better information and at this point, nobody cares
1665 skb_set_network_header(skb, len_rthdr);
1666 skb_set_transport_header(skb, len_rthdr);
1668 if (skb->len < len_rthdr + 2)
1671 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1672 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1674 if (skb->len < len_rthdr + hdrlen)
1678 * Initialize skb->protocol if the injected frame is a data frame
1679 * carrying a rfc1042 header
1681 if (ieee80211_is_data(hdr->frame_control) &&
1682 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1683 u8 *payload = (u8 *)hdr + hdrlen;
1685 if (ether_addr_equal(payload, rfc1042_header))
1686 skb->protocol = cpu_to_be16((payload[6] << 8) |
1690 memset(info, 0, sizeof(*info));
1692 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1693 IEEE80211_TX_CTL_INJECTED;
1695 /* process and remove the injection radiotap header */
1696 if (!ieee80211_parse_tx_radiotap(skb))
1702 * We process outgoing injected frames that have a local address
1703 * we handle as though they are non-injected frames.
1704 * This code here isn't entirely correct, the local MAC address
1705 * isn't always enough to find the interface to use; for proper
1706 * VLAN/WDS support we will need a different mechanism (which
1707 * likely isn't going to be monitor interfaces).
1709 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1711 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1712 if (!ieee80211_sdata_running(tmp_sdata))
1714 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1715 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1716 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1718 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1724 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1725 if (!chanctx_conf) {
1726 tmp_sdata = rcu_dereference(local->monitor_sdata);
1729 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1733 chandef = &chanctx_conf->def;
1734 else if (!local->use_chanctx)
1735 chandef = &local->_oper_chandef;
1740 * Frame injection is not allowed if beaconing is not allowed
1741 * or if we need radar detection. Beaconing is usually not allowed when
1742 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1743 * Passive scan is also used in world regulatory domains where
1744 * your country is not known and as such it should be treated as
1745 * NO TX unless the channel is explicitly allowed in which case
1746 * your current regulatory domain would not have the passive scan
1749 * Since AP mode uses monitor interfaces to inject/TX management
1750 * frames we can make AP mode the exception to this rule once it
1751 * supports radar detection as its implementation can deal with
1752 * radar detection by itself. We can do that later by adding a
1753 * monitor flag interfaces used for AP support.
1755 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1759 info->band = chandef->chan->band;
1760 ieee80211_xmit(sdata, skb);
1763 return NETDEV_TX_OK;
1769 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1773 * Measure Tx frame arrival time for Tx latency statistics calculation
1774 * A single Tx frame latency should be measured from when it is entering the
1775 * Kernel until we receive Tx complete confirmation indication and the skb is
1778 static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local *local,
1779 struct sk_buff *skb)
1781 struct ieee80211_tx_latency_bin_ranges *tx_latency;
1783 tx_latency = rcu_dereference(local->tx_latency);
1786 skb->tstamp = ktime_get();
1790 * ieee80211_build_hdr - build 802.11 header in the given frame
1791 * @sdata: virtual interface to build the header for
1792 * @skb: the skb to build the header in
1793 * @info_flags: skb flags to set
1795 * This function takes the skb with 802.3 header and reformats the header to
1796 * the appropriate IEEE 802.11 header based on which interface the packet is
1797 * being transmitted on.
1799 * Note that this function also takes care of the TX status request and
1800 * potential unsharing of the SKB - this needs to be interleaved with the
1803 * The function requires the read-side RCU lock held
1805 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1807 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
1808 struct sk_buff *skb, u32 info_flags)
1810 struct ieee80211_local *local = sdata->local;
1811 struct ieee80211_tx_info *info;
1813 u16 ethertype, hdrlen, meshhdrlen = 0;
1815 struct ieee80211_hdr hdr;
1816 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1817 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1818 const u8 *encaps_data;
1819 int encaps_len, skip_header_bytes;
1821 struct sta_info *sta = NULL;
1822 bool wme_sta = false, authorized = false, tdls_auth = false;
1823 bool tdls_peer = false, tdls_setup_frame = false;
1826 struct ieee80211_chanctx_conf *chanctx_conf;
1827 struct ieee80211_sub_if_data *ap_sdata;
1828 enum ieee80211_band band;
1831 /* convert Ethernet header to proper 802.11 header (based on
1832 * operation mode) */
1833 ethertype = (skb->data[12] << 8) | skb->data[13];
1834 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1836 switch (sdata->vif.type) {
1837 case NL80211_IFTYPE_AP_VLAN:
1838 sta = rcu_dereference(sdata->u.vlan.sta);
1840 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1842 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1843 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1844 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1845 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1847 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1848 wme_sta = sta->sta.wme;
1850 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1852 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1853 if (!chanctx_conf) {
1857 band = chanctx_conf->def.chan->band;
1861 case NL80211_IFTYPE_AP:
1862 if (sdata->vif.type == NL80211_IFTYPE_AP)
1863 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1864 if (!chanctx_conf) {
1868 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1870 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1871 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1872 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1874 band = chanctx_conf->def.chan->band;
1876 case NL80211_IFTYPE_WDS:
1877 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1879 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1880 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1881 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1882 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1885 * This is the exception! WDS style interfaces are prohibited
1886 * when channel contexts are in used so this must be valid
1888 band = local->hw.conf.chandef.chan->band;
1890 #ifdef CONFIG_MAC80211_MESH
1891 case NL80211_IFTYPE_MESH_POINT:
1892 if (!is_multicast_ether_addr(skb->data)) {
1893 struct sta_info *next_hop;
1894 bool mpp_lookup = true;
1896 mpath = mesh_path_lookup(sdata, skb->data);
1899 next_hop = rcu_dereference(mpath->next_hop);
1901 !(mpath->flags & (MESH_PATH_ACTIVE |
1902 MESH_PATH_RESOLVING)))
1907 mppath = mpp_path_lookup(sdata, skb->data);
1909 if (mppath && mpath)
1910 mesh_path_del(mpath->sdata, mpath->dst);
1914 * Use address extension if it is a packet from
1915 * another interface or if we know the destination
1916 * is being proxied by a portal (i.e. portal address
1917 * differs from proxied address)
1919 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1920 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1921 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1922 skb->data, skb->data + ETH_ALEN);
1923 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1926 /* DS -> MBSS (802.11-2012 13.11.3.3).
1927 * For unicast with unknown forwarding information,
1928 * destination might be in the MBSS or if that fails
1929 * forwarded to another mesh gate. In either case
1930 * resolution will be handled in ieee80211_xmit(), so
1931 * leave the original DA. This also works for mcast */
1932 const u8 *mesh_da = skb->data;
1935 mesh_da = mppath->mpp;
1937 mesh_da = mpath->dst;
1939 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1940 mesh_da, sdata->vif.addr);
1941 if (is_multicast_ether_addr(mesh_da))
1942 /* DA TA mSA AE:SA */
1943 meshhdrlen = ieee80211_new_mesh_header(
1945 skb->data + ETH_ALEN, NULL);
1947 /* RA TA mDA mSA AE:DA SA */
1948 meshhdrlen = ieee80211_new_mesh_header(
1949 sdata, &mesh_hdr, skb->data,
1950 skb->data + ETH_ALEN);
1953 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1954 if (!chanctx_conf) {
1958 band = chanctx_conf->def.chan->band;
1961 case NL80211_IFTYPE_STATION:
1962 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1963 sta = sta_info_get(sdata, skb->data);
1965 authorized = test_sta_flag(sta,
1966 WLAN_STA_AUTHORIZED);
1967 wme_sta = sta->sta.wme;
1968 tdls_peer = test_sta_flag(sta,
1969 WLAN_STA_TDLS_PEER);
1970 tdls_auth = test_sta_flag(sta,
1971 WLAN_STA_TDLS_PEER_AUTH);
1976 ethertype == ETH_P_TDLS &&
1978 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1982 * TDLS link during setup - throw out frames to peer. We allow
1983 * TDLS-setup frames to unauthorized peers for the special case
1984 * of a link teardown after a TDLS sta is removed due to being
1987 if (tdls_peer && !tdls_auth && !tdls_setup_frame) {
1992 /* send direct packets to authorized TDLS peers */
1993 if (tdls_peer && tdls_auth) {
1995 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1996 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1997 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1999 } else if (sdata->u.mgd.use_4addr &&
2000 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2001 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2002 IEEE80211_FCTL_TODS);
2004 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2005 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2006 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2007 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2010 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2012 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2013 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2014 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2017 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2018 if (!chanctx_conf) {
2022 band = chanctx_conf->def.chan->band;
2024 case NL80211_IFTYPE_OCB:
2026 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2027 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2028 eth_broadcast_addr(hdr.addr3);
2030 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2031 if (!chanctx_conf) {
2035 band = chanctx_conf->def.chan->band;
2037 case NL80211_IFTYPE_ADHOC:
2039 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2040 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2041 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2043 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2044 if (!chanctx_conf) {
2048 band = chanctx_conf->def.chan->band;
2056 * There's no need to try to look up the destination
2057 * if it is a multicast address (which can only happen
2060 multicast = is_multicast_ether_addr(hdr.addr1);
2062 sta = sta_info_get(sdata, hdr.addr1);
2064 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2065 wme_sta = sta->sta.wme;
2069 /* For mesh, the use of the QoS header is mandatory */
2070 if (ieee80211_vif_is_mesh(&sdata->vif))
2073 /* receiver and we are QoS enabled, use a QoS type frame */
2074 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
2075 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2080 * Drop unicast frames to unauthorised stations unless they are
2081 * EAPOL frames from the local station.
2083 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2084 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2085 !multicast && !authorized &&
2086 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2087 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2088 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2089 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2090 sdata->name, hdr.addr1);
2093 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2099 if (unlikely(!multicast && skb->sk &&
2100 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2101 struct sk_buff *ack_skb = skb_clone_sk(skb);
2104 unsigned long flags;
2107 spin_lock_irqsave(&local->ack_status_lock, flags);
2108 id = idr_alloc(&local->ack_status_frames, ack_skb,
2109 1, 0x10000, GFP_ATOMIC);
2110 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2114 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2122 * If the skb is shared we need to obtain our own copy.
2124 if (skb_shared(skb)) {
2125 struct sk_buff *tmp_skb = skb;
2127 /* can't happen -- skb is a clone if info_id != 0 */
2130 skb = skb_clone(skb, GFP_ATOMIC);
2139 hdr.frame_control = fc;
2140 hdr.duration_id = 0;
2143 skip_header_bytes = ETH_HLEN;
2144 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2145 encaps_data = bridge_tunnel_header;
2146 encaps_len = sizeof(bridge_tunnel_header);
2147 skip_header_bytes -= 2;
2148 } else if (ethertype >= ETH_P_802_3_MIN) {
2149 encaps_data = rfc1042_header;
2150 encaps_len = sizeof(rfc1042_header);
2151 skip_header_bytes -= 2;
2157 nh_pos = skb_network_header(skb) - skb->data;
2158 h_pos = skb_transport_header(skb) - skb->data;
2160 skb_pull(skb, skip_header_bytes);
2161 nh_pos -= skip_header_bytes;
2162 h_pos -= skip_header_bytes;
2164 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2167 * So we need to modify the skb header and hence need a copy of
2168 * that. The head_need variable above doesn't, so far, include
2169 * the needed header space that we don't need right away. If we
2170 * can, then we don't reallocate right now but only after the
2171 * frame arrives at the master device (if it does...)
2173 * If we cannot, however, then we will reallocate to include all
2174 * the ever needed space. Also, if we need to reallocate it anyway,
2175 * make it big enough for everything we may ever need.
2178 if (head_need > 0 || skb_cloned(skb)) {
2179 head_need += sdata->encrypt_headroom;
2180 head_need += local->tx_headroom;
2181 head_need = max_t(int, 0, head_need);
2182 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2183 ieee80211_free_txskb(&local->hw, skb);
2185 return ERR_PTR(-ENOMEM);
2190 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2191 nh_pos += encaps_len;
2192 h_pos += encaps_len;
2195 #ifdef CONFIG_MAC80211_MESH
2196 if (meshhdrlen > 0) {
2197 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2198 nh_pos += meshhdrlen;
2199 h_pos += meshhdrlen;
2203 if (ieee80211_is_data_qos(fc)) {
2204 __le16 *qos_control;
2206 qos_control = (__le16 *) skb_push(skb, 2);
2207 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2209 * Maybe we could actually set some fields here, for now just
2210 * initialise to zero to indicate no special operation.
2214 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2219 /* Update skb pointers to various headers since this modified frame
2220 * is going to go through Linux networking code that may potentially
2221 * need things like pointer to IP header. */
2222 skb_set_mac_header(skb, 0);
2223 skb_set_network_header(skb, nh_pos);
2224 skb_set_transport_header(skb, h_pos);
2226 info = IEEE80211_SKB_CB(skb);
2227 memset(info, 0, sizeof(*info));
2229 info->flags = info_flags;
2230 info->ack_frame_id = info_id;
2236 return ERR_PTR(ret);
2239 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2240 struct net_device *dev,
2243 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2244 struct ieee80211_local *local = sdata->local;
2246 if (unlikely(skb->len < ETH_HLEN)) {
2253 /* Measure frame arrival for Tx latency statistics calculation */
2254 ieee80211_tx_latency_start_msrmnt(local, skb);
2256 skb = ieee80211_build_hdr(sdata, skb, info_flags);
2260 dev->stats.tx_packets++;
2261 dev->stats.tx_bytes += skb->len;
2262 dev->trans_start = jiffies;
2264 ieee80211_xmit(sdata, skb);
2270 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2271 * @skb: packet to be sent
2272 * @dev: incoming interface
2274 * On failure skb will be freed.
2276 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
2277 struct net_device *dev)
2279 __ieee80211_subif_start_xmit(skb, dev, 0);
2280 return NETDEV_TX_OK;
2284 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
2285 struct sk_buff *skb, u32 info_flags)
2287 struct ieee80211_hdr *hdr;
2288 struct ieee80211_tx_data tx = {
2289 .local = sdata->local,
2295 skb = ieee80211_build_hdr(sdata, skb, info_flags);
2299 hdr = (void *)skb->data;
2300 tx.sta = sta_info_get(sdata, hdr->addr1);
2303 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
2306 return ERR_PTR(-EINVAL);
2315 * ieee80211_clear_tx_pending may not be called in a context where
2316 * it is possible that it packets could come in again.
2318 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2320 struct sk_buff *skb;
2323 for (i = 0; i < local->hw.queues; i++) {
2324 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2325 ieee80211_free_txskb(&local->hw, skb);
2330 * Returns false if the frame couldn't be transmitted but was queued instead,
2331 * which in this case means re-queued -- take as an indication to stop sending
2332 * more pending frames.
2334 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2335 struct sk_buff *skb)
2337 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2338 struct ieee80211_sub_if_data *sdata;
2339 struct sta_info *sta;
2340 struct ieee80211_hdr *hdr;
2342 struct ieee80211_chanctx_conf *chanctx_conf;
2344 sdata = vif_to_sdata(info->control.vif);
2346 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2347 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2348 if (unlikely(!chanctx_conf)) {
2352 info->band = chanctx_conf->def.chan->band;
2353 result = ieee80211_tx(sdata, skb, true);
2355 struct sk_buff_head skbs;
2357 __skb_queue_head_init(&skbs);
2358 __skb_queue_tail(&skbs, skb);
2360 hdr = (struct ieee80211_hdr *)skb->data;
2361 sta = sta_info_get(sdata, hdr->addr1);
2363 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2370 * Transmit all pending packets. Called from tasklet.
2372 void ieee80211_tx_pending(unsigned long data)
2374 struct ieee80211_local *local = (struct ieee80211_local *)data;
2375 unsigned long flags;
2381 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2382 for (i = 0; i < local->hw.queues; i++) {
2384 * If queue is stopped by something other than due to pending
2385 * frames, or we have no pending frames, proceed to next queue.
2387 if (local->queue_stop_reasons[i] ||
2388 skb_queue_empty(&local->pending[i]))
2391 while (!skb_queue_empty(&local->pending[i])) {
2392 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2393 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2395 if (WARN_ON(!info->control.vif)) {
2396 ieee80211_free_txskb(&local->hw, skb);
2400 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2403 txok = ieee80211_tx_pending_skb(local, skb);
2404 spin_lock_irqsave(&local->queue_stop_reason_lock,
2410 if (skb_queue_empty(&local->pending[i]))
2411 ieee80211_propagate_queue_wake(local, i);
2413 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2418 /* functions for drivers to get certain frames */
2420 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2421 struct ps_data *ps, struct sk_buff *skb,
2426 int i, have_bits = 0, n1, n2;
2428 /* Generate bitmap for TIM only if there are any STAs in power save
2430 if (atomic_read(&ps->num_sta_ps) > 0)
2431 /* in the hope that this is faster than
2432 * checking byte-for-byte */
2433 have_bits = !bitmap_empty((unsigned long *)ps->tim,
2434 IEEE80211_MAX_AID+1);
2436 if (ps->dtim_count == 0)
2437 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2442 tim = pos = (u8 *) skb_put(skb, 6);
2443 *pos++ = WLAN_EID_TIM;
2445 *pos++ = ps->dtim_count;
2446 *pos++ = sdata->vif.bss_conf.dtim_period;
2448 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2451 ps->dtim_bc_mc = aid0 == 1;
2454 /* Find largest even number N1 so that bits numbered 1 through
2455 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2456 * (N2 + 1) x 8 through 2007 are 0. */
2458 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2465 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2472 /* Bitmap control */
2474 /* Part Virt Bitmap */
2475 skb_put(skb, n2 - n1);
2476 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2478 tim[1] = n2 - n1 + 4;
2480 *pos++ = aid0; /* Bitmap control */
2481 *pos++ = 0; /* Part Virt Bitmap */
2485 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2486 struct ps_data *ps, struct sk_buff *skb,
2489 struct ieee80211_local *local = sdata->local;
2492 * Not very nice, but we want to allow the driver to call
2493 * ieee80211_beacon_get() as a response to the set_tim()
2494 * callback. That, however, is already invoked under the
2495 * sta_lock to guarantee consistent and race-free update
2496 * of the tim bitmap in mac80211 and the driver.
2498 if (local->tim_in_locked_section) {
2499 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2501 spin_lock_bh(&local->tim_lock);
2502 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2503 spin_unlock_bh(&local->tim_lock);
2509 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
2510 struct beacon_data *beacon)
2512 struct probe_resp *resp;
2514 size_t beacon_data_len;
2516 u8 count = beacon->csa_current_counter;
2518 switch (sdata->vif.type) {
2519 case NL80211_IFTYPE_AP:
2520 beacon_data = beacon->tail;
2521 beacon_data_len = beacon->tail_len;
2523 case NL80211_IFTYPE_ADHOC:
2524 beacon_data = beacon->head;
2525 beacon_data_len = beacon->head_len;
2527 case NL80211_IFTYPE_MESH_POINT:
2528 beacon_data = beacon->head;
2529 beacon_data_len = beacon->head_len;
2536 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
2537 resp = rcu_dereference(sdata->u.ap.probe_resp);
2539 if (beacon->csa_counter_offsets[i]) {
2540 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
2546 beacon_data[beacon->csa_counter_offsets[i]] = count;
2549 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
2550 resp->data[resp->csa_counter_offsets[i]] = count;
2555 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
2557 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2558 struct beacon_data *beacon = NULL;
2563 if (sdata->vif.type == NL80211_IFTYPE_AP)
2564 beacon = rcu_dereference(sdata->u.ap.beacon);
2565 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2566 beacon = rcu_dereference(sdata->u.ibss.presp);
2567 else if (ieee80211_vif_is_mesh(&sdata->vif))
2568 beacon = rcu_dereference(sdata->u.mesh.beacon);
2573 beacon->csa_current_counter--;
2575 /* the counter should never reach 0 */
2576 WARN_ON_ONCE(!beacon->csa_current_counter);
2577 count = beacon->csa_current_counter;
2583 EXPORT_SYMBOL(ieee80211_csa_update_counter);
2585 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
2587 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2588 struct beacon_data *beacon = NULL;
2590 size_t beacon_data_len;
2593 if (!ieee80211_sdata_running(sdata))
2597 if (vif->type == NL80211_IFTYPE_AP) {
2598 struct ieee80211_if_ap *ap = &sdata->u.ap;
2600 beacon = rcu_dereference(ap->beacon);
2601 if (WARN_ON(!beacon || !beacon->tail))
2603 beacon_data = beacon->tail;
2604 beacon_data_len = beacon->tail_len;
2605 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
2606 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2608 beacon = rcu_dereference(ifibss->presp);
2612 beacon_data = beacon->head;
2613 beacon_data_len = beacon->head_len;
2614 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
2615 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2617 beacon = rcu_dereference(ifmsh->beacon);
2621 beacon_data = beacon->head;
2622 beacon_data_len = beacon->head_len;
2628 if (!beacon->csa_counter_offsets[0])
2631 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
2634 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
2641 EXPORT_SYMBOL(ieee80211_csa_is_complete);
2643 static struct sk_buff *
2644 __ieee80211_beacon_get(struct ieee80211_hw *hw,
2645 struct ieee80211_vif *vif,
2646 struct ieee80211_mutable_offsets *offs,
2649 struct ieee80211_local *local = hw_to_local(hw);
2650 struct beacon_data *beacon = NULL;
2651 struct sk_buff *skb = NULL;
2652 struct ieee80211_tx_info *info;
2653 struct ieee80211_sub_if_data *sdata = NULL;
2654 enum ieee80211_band band;
2655 struct ieee80211_tx_rate_control txrc;
2656 struct ieee80211_chanctx_conf *chanctx_conf;
2657 int csa_off_base = 0;
2661 sdata = vif_to_sdata(vif);
2662 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2664 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2668 memset(offs, 0, sizeof(*offs));
2670 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2671 struct ieee80211_if_ap *ap = &sdata->u.ap;
2673 beacon = rcu_dereference(ap->beacon);
2675 if (beacon->csa_counter_offsets[0]) {
2677 ieee80211_csa_update_counter(vif);
2679 ieee80211_set_csa(sdata, beacon);
2683 * headroom, head length,
2684 * tail length and maximum TIM length
2686 skb = dev_alloc_skb(local->tx_headroom +
2688 beacon->tail_len + 256 +
2689 local->hw.extra_beacon_tailroom);
2693 skb_reserve(skb, local->tx_headroom);
2694 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2697 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
2701 offs->tim_offset = beacon->head_len;
2702 offs->tim_length = skb->len - beacon->head_len;
2704 /* for AP the csa offsets are from tail */
2705 csa_off_base = skb->len;
2709 memcpy(skb_put(skb, beacon->tail_len),
2710 beacon->tail, beacon->tail_len);
2713 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2714 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2715 struct ieee80211_hdr *hdr;
2717 beacon = rcu_dereference(ifibss->presp);
2721 if (beacon->csa_counter_offsets[0]) {
2723 ieee80211_csa_update_counter(vif);
2725 ieee80211_set_csa(sdata, beacon);
2728 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
2729 local->hw.extra_beacon_tailroom);
2732 skb_reserve(skb, local->tx_headroom);
2733 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2736 hdr = (struct ieee80211_hdr *) skb->data;
2737 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2738 IEEE80211_STYPE_BEACON);
2739 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2740 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2742 beacon = rcu_dereference(ifmsh->beacon);
2746 if (beacon->csa_counter_offsets[0]) {
2748 /* TODO: For mesh csa_counter is in TU, so
2749 * decrementing it by one isn't correct, but
2750 * for now we leave it consistent with overall
2751 * mac80211's behavior.
2753 ieee80211_csa_update_counter(vif);
2755 ieee80211_set_csa(sdata, beacon);
2758 if (ifmsh->sync_ops)
2759 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
2761 skb = dev_alloc_skb(local->tx_headroom +
2765 local->hw.extra_beacon_tailroom);
2768 skb_reserve(skb, local->tx_headroom);
2769 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2771 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
2774 offs->tim_offset = beacon->head_len;
2775 offs->tim_length = skb->len - beacon->head_len;
2778 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
2786 if (offs && beacon) {
2789 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
2790 u16 csa_off = beacon->csa_counter_offsets[i];
2795 offs->csa_counter_offs[i] = csa_off_base + csa_off;
2799 band = chanctx_conf->def.chan->band;
2801 info = IEEE80211_SKB_CB(skb);
2803 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2804 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2807 memset(&txrc, 0, sizeof(txrc));
2809 txrc.sband = local->hw.wiphy->bands[band];
2810 txrc.bss_conf = &sdata->vif.bss_conf;
2812 txrc.reported_rate.idx = -1;
2813 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2814 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2815 txrc.max_rate_idx = -1;
2817 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2819 rate_control_get_rate(sdata, NULL, &txrc);
2821 info->control.vif = vif;
2823 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2824 IEEE80211_TX_CTL_ASSIGN_SEQ |
2825 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2833 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
2834 struct ieee80211_vif *vif,
2835 struct ieee80211_mutable_offsets *offs)
2837 return __ieee80211_beacon_get(hw, vif, offs, true);
2839 EXPORT_SYMBOL(ieee80211_beacon_get_template);
2841 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2842 struct ieee80211_vif *vif,
2843 u16 *tim_offset, u16 *tim_length)
2845 struct ieee80211_mutable_offsets offs = {};
2846 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
2849 *tim_offset = offs.tim_offset;
2852 *tim_length = offs.tim_length;
2856 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2858 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2859 struct ieee80211_vif *vif)
2861 struct ieee80211_if_ap *ap = NULL;
2862 struct sk_buff *skb = NULL;
2863 struct probe_resp *presp = NULL;
2864 struct ieee80211_hdr *hdr;
2865 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2867 if (sdata->vif.type != NL80211_IFTYPE_AP)
2873 presp = rcu_dereference(ap->probe_resp);
2877 skb = dev_alloc_skb(presp->len);
2881 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2883 hdr = (struct ieee80211_hdr *) skb->data;
2884 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2890 EXPORT_SYMBOL(ieee80211_proberesp_get);
2892 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2893 struct ieee80211_vif *vif)
2895 struct ieee80211_sub_if_data *sdata;
2896 struct ieee80211_if_managed *ifmgd;
2897 struct ieee80211_pspoll *pspoll;
2898 struct ieee80211_local *local;
2899 struct sk_buff *skb;
2901 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2904 sdata = vif_to_sdata(vif);
2905 ifmgd = &sdata->u.mgd;
2906 local = sdata->local;
2908 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2912 skb_reserve(skb, local->hw.extra_tx_headroom);
2914 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2915 memset(pspoll, 0, sizeof(*pspoll));
2916 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2917 IEEE80211_STYPE_PSPOLL);
2918 pspoll->aid = cpu_to_le16(ifmgd->aid);
2920 /* aid in PS-Poll has its two MSBs each set to 1 */
2921 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2923 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2924 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2928 EXPORT_SYMBOL(ieee80211_pspoll_get);
2930 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2931 struct ieee80211_vif *vif)
2933 struct ieee80211_hdr_3addr *nullfunc;
2934 struct ieee80211_sub_if_data *sdata;
2935 struct ieee80211_if_managed *ifmgd;
2936 struct ieee80211_local *local;
2937 struct sk_buff *skb;
2939 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2942 sdata = vif_to_sdata(vif);
2943 ifmgd = &sdata->u.mgd;
2944 local = sdata->local;
2946 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2950 skb_reserve(skb, local->hw.extra_tx_headroom);
2952 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2954 memset(nullfunc, 0, sizeof(*nullfunc));
2955 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2956 IEEE80211_STYPE_NULLFUNC |
2957 IEEE80211_FCTL_TODS);
2958 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2959 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2960 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2964 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2966 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2968 const u8 *ssid, size_t ssid_len,
2971 struct ieee80211_local *local = hw_to_local(hw);
2972 struct ieee80211_hdr_3addr *hdr;
2973 struct sk_buff *skb;
2977 ie_ssid_len = 2 + ssid_len;
2979 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2980 ie_ssid_len + tailroom);
2984 skb_reserve(skb, local->hw.extra_tx_headroom);
2986 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2987 memset(hdr, 0, sizeof(*hdr));
2988 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2989 IEEE80211_STYPE_PROBE_REQ);
2990 eth_broadcast_addr(hdr->addr1);
2991 memcpy(hdr->addr2, src_addr, ETH_ALEN);
2992 eth_broadcast_addr(hdr->addr3);
2994 pos = skb_put(skb, ie_ssid_len);
2995 *pos++ = WLAN_EID_SSID;
2998 memcpy(pos, ssid, ssid_len);
3003 EXPORT_SYMBOL(ieee80211_probereq_get);
3005 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3006 const void *frame, size_t frame_len,
3007 const struct ieee80211_tx_info *frame_txctl,
3008 struct ieee80211_rts *rts)
3010 const struct ieee80211_hdr *hdr = frame;
3012 rts->frame_control =
3013 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3014 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3016 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3017 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3019 EXPORT_SYMBOL(ieee80211_rts_get);
3021 void ieee80211_ctstoself_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_cts *cts)
3026 const struct ieee80211_hdr *hdr = frame;
3028 cts->frame_control =
3029 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3030 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3031 frame_len, frame_txctl);
3032 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3034 EXPORT_SYMBOL(ieee80211_ctstoself_get);
3037 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3038 struct ieee80211_vif *vif)
3040 struct ieee80211_local *local = hw_to_local(hw);
3041 struct sk_buff *skb = NULL;
3042 struct ieee80211_tx_data tx;
3043 struct ieee80211_sub_if_data *sdata;
3045 struct ieee80211_tx_info *info;
3046 struct ieee80211_chanctx_conf *chanctx_conf;
3048 sdata = vif_to_sdata(vif);
3051 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3056 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3057 struct beacon_data *beacon =
3058 rcu_dereference(sdata->u.ap.beacon);
3060 if (!beacon || !beacon->head)
3063 ps = &sdata->u.ap.ps;
3064 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3065 ps = &sdata->u.mesh.ps;
3070 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3071 goto out; /* send buffered bc/mc only after DTIM beacon */
3074 skb = skb_dequeue(&ps->bc_buf);
3077 local->total_ps_buffered--;
3079 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3080 struct ieee80211_hdr *hdr =
3081 (struct ieee80211_hdr *) skb->data;
3082 /* more buffered multicast/broadcast frames ==> set
3083 * MoreData flag in IEEE 802.11 header to inform PS
3085 hdr->frame_control |=
3086 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3089 if (sdata->vif.type == NL80211_IFTYPE_AP)
3090 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3091 if (!ieee80211_tx_prepare(sdata, &tx, skb))
3093 dev_kfree_skb_any(skb);
3096 info = IEEE80211_SKB_CB(skb);
3098 tx.flags |= IEEE80211_TX_PS_BUFFERED;
3099 info->band = chanctx_conf->def.chan->band;
3101 if (invoke_tx_handlers(&tx))
3108 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3110 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3112 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3113 struct ieee80211_sub_if_data *sdata = sta->sdata;
3114 struct ieee80211_local *local = sdata->local;
3118 lockdep_assert_held(&local->sta_mtx);
3120 /* only some cases are supported right now */
3121 switch (sdata->vif.type) {
3122 case NL80211_IFTYPE_STATION:
3123 case NL80211_IFTYPE_AP:
3124 case NL80211_IFTYPE_AP_VLAN:
3131 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3134 if (sta->reserved_tid == tid) {
3139 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3140 sdata_err(sdata, "TID reservation already active\n");
3145 ieee80211_stop_vif_queues(sdata->local, sdata,
3146 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3150 /* Tear down BA sessions so we stop aggregating on this TID */
3151 if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) {
3152 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3153 __ieee80211_stop_tx_ba_session(sta, tid,
3154 AGG_STOP_LOCAL_REQUEST);
3157 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3158 __ieee80211_flush_queues(local, sdata, queues, false);
3160 sta->reserved_tid = tid;
3162 ieee80211_wake_vif_queues(local, sdata,
3163 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3165 if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)
3166 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3172 EXPORT_SYMBOL(ieee80211_reserve_tid);
3174 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3176 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3177 struct ieee80211_sub_if_data *sdata = sta->sdata;
3179 lockdep_assert_held(&sdata->local->sta_mtx);
3181 /* only some cases are supported right now */
3182 switch (sdata->vif.type) {
3183 case NL80211_IFTYPE_STATION:
3184 case NL80211_IFTYPE_AP:
3185 case NL80211_IFTYPE_AP_VLAN:
3192 if (tid != sta->reserved_tid) {
3193 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3197 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3199 EXPORT_SYMBOL(ieee80211_unreserve_tid);
3201 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3202 struct sk_buff *skb, int tid,
3203 enum ieee80211_band band)
3205 int ac = ieee802_1d_to_ac[tid & 7];
3207 skb_set_mac_header(skb, 0);
3208 skb_set_network_header(skb, 0);
3209 skb_set_transport_header(skb, 0);
3211 skb_set_queue_mapping(skb, ac);
3212 skb->priority = tid;
3214 skb->dev = sdata->dev;
3217 * The other path calling ieee80211_xmit is from the tasklet,
3218 * and while we can handle concurrent transmissions locking
3219 * requirements are that we do not come into tx with bhs on.
3222 IEEE80211_SKB_CB(skb)->band = band;
3223 ieee80211_xmit(sdata, skb);