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 inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
42 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
44 u64_stats_update_begin(&tstats->syncp);
46 tstats->tx_bytes += len;
47 u64_stats_update_end(&tstats->syncp);
50 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
51 struct sk_buff *skb, int group_addr,
54 int rate, mrate, erp, dur, i, shift = 0;
55 struct ieee80211_rate *txrate;
56 struct ieee80211_local *local = tx->local;
57 struct ieee80211_supported_band *sband;
58 struct ieee80211_hdr *hdr;
59 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
60 struct ieee80211_chanctx_conf *chanctx_conf;
64 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
66 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
67 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
71 /* assume HW handles this */
72 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
76 if (WARN_ON_ONCE(tx->rate.idx < 0))
79 sband = local->hw.wiphy->bands[info->band];
80 txrate = &sband->bitrates[tx->rate.idx];
82 erp = txrate->flags & IEEE80211_RATE_ERP_G;
85 * data and mgmt (except PS Poll):
87 * - during contention period:
88 * if addr1 is group address: 0
89 * if more fragments = 0 and addr1 is individual address: time to
90 * transmit one ACK plus SIFS
91 * if more fragments = 1 and addr1 is individual address: time to
92 * transmit next fragment plus 2 x ACK plus 3 x SIFS
95 * - control response frame (CTS or ACK) shall be transmitted using the
96 * same rate as the immediately previous frame in the frame exchange
97 * sequence, if this rate belongs to the PHY mandatory rates, or else
98 * at the highest possible rate belonging to the PHY rates in the
101 hdr = (struct ieee80211_hdr *)skb->data;
102 if (ieee80211_is_ctl(hdr->frame_control)) {
103 /* TODO: These control frames are not currently sent by
104 * mac80211, but should they be implemented, this function
105 * needs to be updated to support duration field calculation.
107 * RTS: time needed to transmit pending data/mgmt frame plus
108 * one CTS frame plus one ACK frame plus 3 x SIFS
109 * CTS: duration of immediately previous RTS minus time
110 * required to transmit CTS and its SIFS
111 * ACK: 0 if immediately previous directed data/mgmt had
112 * more=0, with more=1 duration in ACK frame is duration
113 * from previous frame minus time needed to transmit ACK
115 * PS Poll: BIT(15) | BIT(14) | aid
121 if (0 /* FIX: data/mgmt during CFP */)
122 return cpu_to_le16(32768);
124 if (group_addr) /* Group address as the destination - no ACK */
127 /* Individual destination address:
128 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
129 * CTS and ACK frames shall be transmitted using the highest rate in
130 * basic rate set that is less than or equal to the rate of the
131 * immediately previous frame and that is using the same modulation
132 * (CCK or OFDM). If no basic rate set matches with these requirements,
133 * the highest mandatory rate of the PHY that is less than or equal to
134 * the rate of the previous frame is used.
135 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
138 /* use lowest available if everything fails */
139 mrate = sband->bitrates[0].bitrate;
140 for (i = 0; i < sband->n_bitrates; i++) {
141 struct ieee80211_rate *r = &sband->bitrates[i];
143 if (r->bitrate > txrate->bitrate)
146 if ((rate_flags & r->flags) != rate_flags)
149 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
150 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
152 switch (sband->band) {
153 case IEEE80211_BAND_2GHZ: {
155 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
156 flag = IEEE80211_RATE_MANDATORY_G;
158 flag = IEEE80211_RATE_MANDATORY_B;
163 case IEEE80211_BAND_5GHZ:
164 if (r->flags & IEEE80211_RATE_MANDATORY_A)
167 case IEEE80211_BAND_60GHZ:
168 /* TODO, for now fall through */
169 case IEEE80211_NUM_BANDS:
175 /* No matching basic rate found; use highest suitable mandatory
177 rate = DIV_ROUND_UP(mrate, 1 << shift);
180 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
181 if (ieee80211_is_data_qos(hdr->frame_control) &&
182 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
185 /* Time needed to transmit ACK
186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
187 * to closest integer */
188 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
189 tx->sdata->vif.bss_conf.use_short_preamble,
193 /* Frame is fragmented: duration increases with time needed to
194 * transmit next fragment plus ACK and 2 x SIFS. */
195 dur *= 2; /* ACK + SIFS */
197 dur += ieee80211_frame_duration(sband->band, next_frag_len,
198 txrate->bitrate, erp,
199 tx->sdata->vif.bss_conf.use_short_preamble,
203 return cpu_to_le16(dur);
207 static ieee80211_tx_result debug_noinline
208 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
210 struct ieee80211_local *local = tx->local;
211 struct ieee80211_if_managed *ifmgd;
213 /* driver doesn't support power save */
214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
217 /* hardware does dynamic power save */
218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
221 /* dynamic power save disabled */
222 if (local->hw.conf.dynamic_ps_timeout <= 0)
225 /* we are scanning, don't enable power save */
229 if (!local->ps_sdata)
232 /* No point if we're going to suspend */
233 if (local->quiescing)
236 /* dynamic ps is supported only in managed mode */
237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
240 ifmgd = &tx->sdata->u.mgd;
243 * Don't wakeup from power save if u-apsd is enabled, voip ac has
244 * u-apsd enabled and the frame is in voip class. This effectively
245 * means that even if all access categories have u-apsd enabled, in
246 * practise u-apsd is only used with the voip ac. This is a
247 * workaround for the case when received voip class packets do not
248 * have correct qos tag for some reason, due the network or the
251 * Note: ifmgd->uapsd_queues access is racy here. If the value is
252 * changed via debugfs, user needs to reassociate manually to have
253 * everything in sync.
255 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
256 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
257 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
260 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
261 ieee80211_stop_queues_by_reason(&local->hw,
262 IEEE80211_MAX_QUEUE_MAP,
263 IEEE80211_QUEUE_STOP_REASON_PS,
265 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
266 ieee80211_queue_work(&local->hw,
267 &local->dynamic_ps_disable_work);
270 /* Don't restart the timer if we're not disassociated */
271 if (!ifmgd->associated)
274 mod_timer(&local->dynamic_ps_timer, jiffies +
275 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
280 static ieee80211_tx_result debug_noinline
281 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
288 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
291 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
292 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
293 !ieee80211_is_probe_req(hdr->frame_control) &&
294 !ieee80211_is_any_nullfunc(hdr->frame_control))
296 * When software scanning only nullfunc frames (to notify
297 * the sleep state to the AP) and probe requests (for the
298 * active scan) are allowed, all other frames should not be
299 * sent and we should not get here, but if we do
300 * nonetheless, drop them to avoid sending them
301 * off-channel. See the link below and
302 * ieee80211_start_scan() for more.
304 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
308 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
311 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
314 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
321 if (unlikely(!assoc &&
322 ieee80211_is_data(hdr->frame_control))) {
323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
324 sdata_info(tx->sdata,
325 "dropped data frame to not associated station %pM\n",
328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
331 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
332 ieee80211_is_data(hdr->frame_control) &&
333 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
335 * No associated STAs - no need to send multicast
344 /* This function is called whenever the AP is about to exceed the maximum limit
345 * of buffered frames for power saving STAs. This situation should not really
346 * happen often during normal operation, so dropping the oldest buffered packet
347 * from each queue should be OK to make some room for new frames. */
348 static void purge_old_ps_buffers(struct ieee80211_local *local)
350 int total = 0, purged = 0;
352 struct ieee80211_sub_if_data *sdata;
353 struct sta_info *sta;
355 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
358 if (sdata->vif.type == NL80211_IFTYPE_AP)
359 ps = &sdata->u.ap.ps;
360 else if (ieee80211_vif_is_mesh(&sdata->vif))
361 ps = &sdata->u.mesh.ps;
365 skb = skb_dequeue(&ps->bc_buf);
368 ieee80211_free_txskb(&local->hw, skb);
370 total += skb_queue_len(&ps->bc_buf);
374 * Drop one frame from each station from the lowest-priority
375 * AC that has frames at all.
377 list_for_each_entry_rcu(sta, &local->sta_list, list) {
380 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
381 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
382 total += skb_queue_len(&sta->ps_tx_buf[ac]);
385 ieee80211_free_txskb(&local->hw, skb);
391 local->total_ps_buffered = total;
392 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
395 static ieee80211_tx_result
396 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
398 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
399 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
403 * broadcast/multicast frame
405 * If any of the associated/peer stations is in power save mode,
406 * the frame is buffered to be sent after DTIM beacon frame.
407 * This is done either by the hardware or us.
410 /* powersaving STAs currently only in AP/VLAN/mesh mode */
411 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
412 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
416 ps = &tx->sdata->bss->ps;
417 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
418 ps = &tx->sdata->u.mesh.ps;
424 /* no buffering for ordered frames */
425 if (ieee80211_has_order(hdr->frame_control))
428 if (ieee80211_is_probe_req(hdr->frame_control))
431 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
432 info->hw_queue = tx->sdata->vif.cab_queue;
434 /* no stations in PS mode and no buffered packets */
435 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
438 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
440 /* device releases frame after DTIM beacon */
441 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
444 /* buffered in mac80211 */
445 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
446 purge_old_ps_buffers(tx->local);
448 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
450 "BC TX buffer full - dropping the oldest frame\n");
451 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
453 tx->local->total_ps_buffered++;
455 skb_queue_tail(&ps->bc_buf, tx->skb);
460 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
463 if (!ieee80211_is_mgmt(fc))
466 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
469 if (!ieee80211_is_robust_mgmt_frame(skb))
475 static ieee80211_tx_result
476 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
478 struct sta_info *sta = tx->sta;
479 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
481 struct ieee80211_local *local = tx->local;
486 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
487 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
488 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
489 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
490 int ac = skb_get_queue_mapping(tx->skb);
492 if (ieee80211_is_mgmt(hdr->frame_control) &&
493 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
494 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
498 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
499 sta->sta.addr, sta->sta.aid, ac);
500 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
501 purge_old_ps_buffers(tx->local);
503 /* sync with ieee80211_sta_ps_deliver_wakeup */
504 spin_lock(&sta->ps_lock);
506 * STA woke up the meantime and all the frames on ps_tx_buf have
507 * been queued to pending queue. No reordering can happen, go
508 * ahead and Tx the packet.
510 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
511 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
512 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
513 spin_unlock(&sta->ps_lock);
517 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
518 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
520 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
522 ieee80211_free_txskb(&local->hw, old);
524 tx->local->total_ps_buffered++;
526 info->control.jiffies = jiffies;
527 info->control.vif = &tx->sdata->vif;
528 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
529 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
530 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
531 spin_unlock(&sta->ps_lock);
533 if (!timer_pending(&local->sta_cleanup))
534 mod_timer(&local->sta_cleanup,
535 round_jiffies(jiffies +
536 STA_INFO_CLEANUP_INTERVAL));
539 * We queued up some frames, so the TIM bit might
540 * need to be set, recalculate it.
542 sta_info_recalc_tim(sta);
545 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
547 "STA %pM in PS mode, but polling/in SP -> send frame\n",
554 static ieee80211_tx_result debug_noinline
555 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
557 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
560 if (tx->flags & IEEE80211_TX_UNICAST)
561 return ieee80211_tx_h_unicast_ps_buf(tx);
563 return ieee80211_tx_h_multicast_ps_buf(tx);
566 static ieee80211_tx_result debug_noinline
567 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
569 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
571 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
572 if (tx->sdata->control_port_no_encrypt)
573 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
574 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
575 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
581 static ieee80211_tx_result debug_noinline
582 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
584 struct ieee80211_key *key;
585 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
586 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
588 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
591 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
593 else if (ieee80211_is_mgmt(hdr->frame_control) &&
594 is_multicast_ether_addr(hdr->addr1) &&
595 ieee80211_is_robust_mgmt_frame(tx->skb) &&
596 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
598 else if (is_multicast_ether_addr(hdr->addr1) &&
599 (key = rcu_dereference(tx->sdata->default_multicast_key)))
601 else if (!is_multicast_ether_addr(hdr->addr1) &&
602 (key = rcu_dereference(tx->sdata->default_unicast_key)))
608 bool skip_hw = false;
610 /* TODO: add threshold stuff again */
612 switch (tx->key->conf.cipher) {
613 case WLAN_CIPHER_SUITE_WEP40:
614 case WLAN_CIPHER_SUITE_WEP104:
615 case WLAN_CIPHER_SUITE_TKIP:
616 if (!ieee80211_is_data_present(hdr->frame_control))
619 case WLAN_CIPHER_SUITE_CCMP:
620 case WLAN_CIPHER_SUITE_CCMP_256:
621 case WLAN_CIPHER_SUITE_GCMP:
622 case WLAN_CIPHER_SUITE_GCMP_256:
623 if (!ieee80211_is_data_present(hdr->frame_control) &&
624 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
628 skip_hw = (tx->key->conf.flags &
629 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
630 ieee80211_is_mgmt(hdr->frame_control);
632 case WLAN_CIPHER_SUITE_AES_CMAC:
633 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
634 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
635 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
636 if (!ieee80211_is_mgmt(hdr->frame_control))
641 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
642 !ieee80211_is_deauth(hdr->frame_control)))
645 if (!skip_hw && tx->key &&
646 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
647 info->control.hw_key = &tx->key->conf;
653 static ieee80211_tx_result debug_noinline
654 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
656 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
657 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
658 struct ieee80211_supported_band *sband;
660 struct ieee80211_tx_rate_control txrc;
661 struct ieee80211_sta_rates *ratetbl = NULL;
664 memset(&txrc, 0, sizeof(txrc));
666 sband = tx->local->hw.wiphy->bands[info->band];
668 len = min_t(u32, tx->skb->len + FCS_LEN,
669 tx->local->hw.wiphy->frag_threshold);
671 /* set up the tx rate control struct we give the RC algo */
672 txrc.hw = &tx->local->hw;
674 txrc.bss_conf = &tx->sdata->vif.bss_conf;
676 txrc.reported_rate.idx = -1;
677 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
678 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
679 txrc.max_rate_idx = -1;
681 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
683 if (tx->sdata->rc_has_mcs_mask[info->band])
684 txrc.rate_idx_mcs_mask =
685 tx->sdata->rc_rateidx_mcs_mask[info->band];
687 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
688 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
689 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
690 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
692 /* set up RTS protection if desired */
693 if (len > tx->local->hw.wiphy->rts_threshold) {
697 info->control.use_rts = txrc.rts;
698 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
701 * Use short preamble if the BSS can handle it, but not for
702 * management frames unless we know the receiver can handle
703 * that -- the management frame might be to a station that
704 * just wants a probe response.
706 if (tx->sdata->vif.bss_conf.use_short_preamble &&
707 (ieee80211_is_data(hdr->frame_control) ||
708 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
709 txrc.short_preamble = true;
711 info->control.short_preamble = txrc.short_preamble;
714 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
717 * Lets not bother rate control if we're associated and cannot
718 * talk to the sta. This should not happen.
720 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
721 !rate_usable_index_exists(sband, &tx->sta->sta),
722 "%s: Dropped data frame as no usable bitrate found while "
723 "scanning and associated. Target station: "
724 "%pM on %d GHz band\n",
725 tx->sdata->name, hdr->addr1,
730 * If we're associated with the sta at this point we know we can at
731 * least send the frame at the lowest bit rate.
733 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
735 if (tx->sta && !info->control.skip_table)
736 ratetbl = rcu_dereference(tx->sta->sta.rates);
738 if (unlikely(info->control.rates[0].idx < 0)) {
740 struct ieee80211_tx_rate rate = {
741 .idx = ratetbl->rate[0].idx,
742 .flags = ratetbl->rate[0].flags,
743 .count = ratetbl->rate[0].count
746 if (ratetbl->rate[0].idx < 0)
754 tx->rate = info->control.rates[0];
757 if (txrc.reported_rate.idx < 0) {
758 txrc.reported_rate = tx->rate;
759 if (tx->sta && ieee80211_is_data(hdr->frame_control))
760 tx->sta->tx_stats.last_rate = txrc.reported_rate;
762 tx->sta->tx_stats.last_rate = txrc.reported_rate;
767 if (unlikely(!info->control.rates[0].count))
768 info->control.rates[0].count = 1;
770 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
771 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
772 info->control.rates[0].count = 1;
777 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
779 u16 *seq = &sta->tid_seq[tid];
780 __le16 ret = cpu_to_le16(*seq);
782 /* Increase the sequence number. */
783 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
788 static ieee80211_tx_result debug_noinline
789 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
791 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
792 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
797 * Packet injection may want to control the sequence
798 * number, if we have no matching interface then we
799 * neither assign one ourselves nor ask the driver to.
801 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
804 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
807 if (ieee80211_hdrlen(hdr->frame_control) < 24)
810 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
814 * Anything but QoS data that has a sequence number field
815 * (is long enough) gets a sequence number from the global
816 * counter. QoS data frames with a multicast destination
817 * also use the global counter (802.11-2012 9.3.2.10).
819 if (!ieee80211_is_data_qos(hdr->frame_control) ||
820 is_multicast_ether_addr(hdr->addr1)) {
821 /* driver should assign sequence number */
822 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
823 /* for pure STA mode without beacons, we can do it */
824 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
825 tx->sdata->sequence_number += 0x10;
827 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
832 * This should be true for injected/management frames only, for
833 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
834 * above since they are not QoS-data frames.
839 /* include per-STA, per-TID sequence counter */
841 qc = ieee80211_get_qos_ctl(hdr);
842 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
843 tx->sta->tx_stats.msdu[tid]++;
845 if (!tx->sta->sta.txq[0])
846 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
851 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
852 struct sk_buff *skb, int hdrlen,
855 struct ieee80211_local *local = tx->local;
856 struct ieee80211_tx_info *info;
858 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
859 int pos = hdrlen + per_fragm;
860 int rem = skb->len - hdrlen - per_fragm;
862 if (WARN_ON(rem < 0))
865 /* first fragment was already added to queue by caller */
868 int fraglen = per_fragm;
873 tmp = dev_alloc_skb(local->tx_headroom +
875 tx->sdata->encrypt_headroom +
876 IEEE80211_ENCRYPT_TAILROOM);
880 __skb_queue_tail(&tx->skbs, tmp);
883 local->tx_headroom + tx->sdata->encrypt_headroom);
885 /* copy control information */
886 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
888 info = IEEE80211_SKB_CB(tmp);
889 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
890 IEEE80211_TX_CTL_FIRST_FRAGMENT);
893 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
895 skb_copy_queue_mapping(tmp, skb);
896 tmp->priority = skb->priority;
899 /* copy header and data */
900 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
901 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
906 /* adjust first fragment's length */
907 skb_trim(skb, hdrlen + per_fragm);
911 static ieee80211_tx_result debug_noinline
912 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
914 struct sk_buff *skb = tx->skb;
915 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
916 struct ieee80211_hdr *hdr = (void *)skb->data;
917 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
921 /* no matter what happens, tx->skb moves to tx->skbs */
922 __skb_queue_tail(&tx->skbs, skb);
925 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
928 if (tx->local->ops->set_frag_threshold)
932 * Warn when submitting a fragmented A-MPDU frame and drop it.
933 * This scenario is handled in ieee80211_tx_prepare but extra
934 * caution taken here as fragmented ampdu may cause Tx stop.
936 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
939 hdrlen = ieee80211_hdrlen(hdr->frame_control);
941 /* internal error, why isn't DONTFRAG set? */
942 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
946 * Now fragment the frame. This will allocate all the fragments and
947 * chain them (using skb as the first fragment) to skb->next.
948 * During transmission, we will remove the successfully transmitted
949 * fragments from this list. When the low-level driver rejects one
950 * of the fragments then we will simply pretend to accept the skb
951 * but store it away as pending.
953 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
956 /* update duration/seq/flags of fragments */
959 skb_queue_walk(&tx->skbs, skb) {
960 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
962 hdr = (void *)skb->data;
963 info = IEEE80211_SKB_CB(skb);
965 if (!skb_queue_is_last(&tx->skbs, skb)) {
966 hdr->frame_control |= morefrags;
968 * No multi-rate retries for fragmented frames, that
969 * would completely throw off the NAV at other STAs.
971 info->control.rates[1].idx = -1;
972 info->control.rates[2].idx = -1;
973 info->control.rates[3].idx = -1;
974 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
975 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
977 hdr->frame_control &= ~morefrags;
979 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
986 static ieee80211_tx_result debug_noinline
987 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
995 skb_queue_walk(&tx->skbs, skb) {
996 ac = skb_get_queue_mapping(skb);
997 tx->sta->tx_stats.bytes[ac] += skb->len;
1000 tx->sta->tx_stats.packets[ac]++;
1005 static ieee80211_tx_result debug_noinline
1006 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1011 switch (tx->key->conf.cipher) {
1012 case WLAN_CIPHER_SUITE_WEP40:
1013 case WLAN_CIPHER_SUITE_WEP104:
1014 return ieee80211_crypto_wep_encrypt(tx);
1015 case WLAN_CIPHER_SUITE_TKIP:
1016 return ieee80211_crypto_tkip_encrypt(tx);
1017 case WLAN_CIPHER_SUITE_CCMP:
1018 return ieee80211_crypto_ccmp_encrypt(
1019 tx, IEEE80211_CCMP_MIC_LEN);
1020 case WLAN_CIPHER_SUITE_CCMP_256:
1021 return ieee80211_crypto_ccmp_encrypt(
1022 tx, IEEE80211_CCMP_256_MIC_LEN);
1023 case WLAN_CIPHER_SUITE_AES_CMAC:
1024 return ieee80211_crypto_aes_cmac_encrypt(tx);
1025 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1026 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1027 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1028 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1029 return ieee80211_crypto_aes_gmac_encrypt(tx);
1030 case WLAN_CIPHER_SUITE_GCMP:
1031 case WLAN_CIPHER_SUITE_GCMP_256:
1032 return ieee80211_crypto_gcmp_encrypt(tx);
1034 return ieee80211_crypto_hw_encrypt(tx);
1040 static ieee80211_tx_result debug_noinline
1041 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1043 struct sk_buff *skb;
1044 struct ieee80211_hdr *hdr;
1048 skb_queue_walk(&tx->skbs, skb) {
1049 hdr = (void *) skb->data;
1050 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1051 break; /* must not overwrite AID */
1052 if (!skb_queue_is_last(&tx->skbs, skb)) {
1053 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1054 next_len = next->len;
1057 group_addr = is_multicast_ether_addr(hdr->addr1);
1060 ieee80211_duration(tx, skb, group_addr, next_len);
1066 /* actual transmit path */
1068 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1069 struct sk_buff *skb,
1070 struct ieee80211_tx_info *info,
1071 struct tid_ampdu_tx *tid_tx,
1074 bool queued = false;
1075 bool reset_agg_timer = false;
1076 struct sk_buff *purge_skb = NULL;
1078 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1079 info->flags |= IEEE80211_TX_CTL_AMPDU;
1080 reset_agg_timer = true;
1081 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1083 * nothing -- this aggregation session is being started
1084 * but that might still fail with the driver
1086 } else if (!tx->sta->sta.txq[tid]) {
1087 spin_lock(&tx->sta->lock);
1089 * Need to re-check now, because we may get here
1091 * 1) in the window during which the setup is actually
1092 * already done, but not marked yet because not all
1093 * packets are spliced over to the driver pending
1094 * queue yet -- if this happened we acquire the lock
1095 * either before or after the splice happens, but
1096 * need to recheck which of these cases happened.
1098 * 2) during session teardown, if the OPERATIONAL bit
1099 * was cleared due to the teardown but the pointer
1100 * hasn't been assigned NULL yet (or we loaded it
1101 * before it was assigned) -- in this case it may
1102 * now be NULL which means we should just let the
1103 * packet pass through because splicing the frames
1104 * back is already done.
1106 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1109 /* do nothing, let packet pass through */
1110 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1111 info->flags |= IEEE80211_TX_CTL_AMPDU;
1112 reset_agg_timer = true;
1115 info->control.vif = &tx->sdata->vif;
1116 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1117 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS |
1118 IEEE80211_TX_CTL_NO_PS_BUFFER |
1119 IEEE80211_TX_STATUS_EOSP;
1120 __skb_queue_tail(&tid_tx->pending, skb);
1121 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1122 purge_skb = __skb_dequeue(&tid_tx->pending);
1124 spin_unlock(&tx->sta->lock);
1127 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1130 /* reset session timer */
1131 if (reset_agg_timer && tid_tx->timeout)
1132 tid_tx->last_tx = jiffies;
1139 * pass %NULL for the station if unknown, a valid pointer if known
1140 * or an ERR_PTR() if the station is known not to exist
1142 static ieee80211_tx_result
1143 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1144 struct ieee80211_tx_data *tx,
1145 struct sta_info *sta, struct sk_buff *skb)
1147 struct ieee80211_local *local = sdata->local;
1148 struct ieee80211_hdr *hdr;
1149 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1153 memset(tx, 0, sizeof(*tx));
1157 __skb_queue_head_init(&tx->skbs);
1160 * If this flag is set to true anywhere, and we get here,
1161 * we are doing the needed processing, so remove the flag
1164 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1166 hdr = (struct ieee80211_hdr *) skb->data;
1172 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1173 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1174 if (!tx->sta && sdata->wdev.use_4addr)
1176 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1177 IEEE80211_TX_CTL_INJECTED) ||
1178 tx->sdata->control_port_protocol == tx->skb->protocol) {
1179 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1181 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1182 tx->sta = sta_info_get(sdata, hdr->addr1);
1185 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1186 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1187 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1188 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1189 struct tid_ampdu_tx *tid_tx;
1191 qc = ieee80211_get_qos_ctl(hdr);
1192 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1194 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1198 queued = ieee80211_tx_prep_agg(tx, skb, info,
1201 if (unlikely(queued))
1206 if (is_multicast_ether_addr(hdr->addr1)) {
1207 tx->flags &= ~IEEE80211_TX_UNICAST;
1208 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1210 tx->flags |= IEEE80211_TX_UNICAST;
1212 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1213 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1214 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1215 info->flags & IEEE80211_TX_CTL_AMPDU)
1216 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1220 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1221 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1222 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1223 ieee80211_check_fast_xmit(tx->sta);
1226 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1231 static void ieee80211_drv_tx(struct ieee80211_local *local,
1232 struct ieee80211_vif *vif,
1233 struct ieee80211_sta *pubsta,
1234 struct sk_buff *skb)
1236 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1237 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1238 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1239 struct ieee80211_tx_control control = {
1242 struct ieee80211_txq *txq = NULL;
1243 struct txq_info *txqi;
1246 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)
1249 if (!ieee80211_is_data(hdr->frame_control))
1253 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1255 txq = pubsta->txq[tid];
1264 txqi = to_txq_info(txq);
1265 atomic_inc(&sdata->txqs_len[ac]);
1266 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)
1267 netif_stop_subqueue(sdata->dev, ac);
1269 skb_queue_tail(&txqi->queue, skb);
1270 drv_wake_tx_queue(local, txqi);
1275 drv_tx(local, &control, skb);
1278 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
1279 struct ieee80211_txq *txq)
1281 struct ieee80211_local *local = hw_to_local(hw);
1282 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
1283 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
1284 struct ieee80211_hdr *hdr;
1285 struct sk_buff *skb = NULL;
1288 spin_lock_bh(&txqi->queue.lock);
1290 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
1293 skb = __skb_dequeue(&txqi->queue);
1297 atomic_dec(&sdata->txqs_len[ac]);
1298 if (__netif_subqueue_stopped(sdata->dev, ac))
1299 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);
1301 hdr = (struct ieee80211_hdr *)skb->data;
1302 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1303 struct sta_info *sta = container_of(txq->sta, struct sta_info,
1305 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1307 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
1308 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
1309 info->flags |= IEEE80211_TX_CTL_AMPDU;
1311 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1315 spin_unlock_bh(&txqi->queue.lock);
1319 EXPORT_SYMBOL(ieee80211_tx_dequeue);
1321 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1322 struct ieee80211_vif *vif,
1323 struct ieee80211_sta *sta,
1324 struct sk_buff_head *skbs,
1327 struct sk_buff *skb, *tmp;
1328 unsigned long flags;
1330 skb_queue_walk_safe(skbs, skb, tmp) {
1331 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1332 int q = info->hw_queue;
1334 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1335 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1336 __skb_unlink(skb, skbs);
1337 ieee80211_free_txskb(&local->hw, skb);
1342 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1343 if (local->queue_stop_reasons[q] ||
1344 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1345 if (unlikely(info->flags &
1346 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1347 if (local->queue_stop_reasons[q] &
1348 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1350 * Drop off-channel frames if queues
1351 * are stopped for any reason other
1352 * than off-channel operation. Never
1355 spin_unlock_irqrestore(
1356 &local->queue_stop_reason_lock,
1358 ieee80211_purge_tx_queue(&local->hw,
1365 * Since queue is stopped, queue up frames for
1366 * later transmission from the tx-pending
1367 * tasklet when the queue is woken again.
1370 skb_queue_splice_init(skbs,
1371 &local->pending[q]);
1373 skb_queue_splice_tail_init(skbs,
1374 &local->pending[q]);
1376 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1381 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1383 info->control.vif = vif;
1385 __skb_unlink(skb, skbs);
1386 ieee80211_drv_tx(local, vif, sta, skb);
1393 * Returns false if the frame couldn't be transmitted but was queued instead.
1395 static bool __ieee80211_tx(struct ieee80211_local *local,
1396 struct sk_buff_head *skbs, int led_len,
1397 struct sta_info *sta, bool txpending)
1399 struct ieee80211_tx_info *info;
1400 struct ieee80211_sub_if_data *sdata;
1401 struct ieee80211_vif *vif;
1402 struct ieee80211_sta *pubsta;
1403 struct sk_buff *skb;
1407 if (WARN_ON(skb_queue_empty(skbs)))
1410 skb = skb_peek(skbs);
1411 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1412 info = IEEE80211_SKB_CB(skb);
1413 sdata = vif_to_sdata(info->control.vif);
1414 if (sta && !sta->uploaded)
1422 switch (sdata->vif.type) {
1423 case NL80211_IFTYPE_MONITOR:
1424 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1428 sdata = rcu_dereference(local->monitor_sdata);
1432 vif->hw_queue[skb_get_queue_mapping(skb)];
1433 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1439 case NL80211_IFTYPE_AP_VLAN:
1440 sdata = container_of(sdata->bss,
1441 struct ieee80211_sub_if_data, u.ap);
1448 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1451 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1453 WARN_ON_ONCE(!skb_queue_empty(skbs));
1459 * Invoke TX handlers, return 0 on success and non-zero if the
1460 * frame was dropped or queued.
1462 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1464 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1465 ieee80211_tx_result res = TX_DROP;
1467 #define CALL_TXH(txh) \
1470 if (res != TX_CONTINUE) \
1474 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1475 CALL_TXH(ieee80211_tx_h_check_assoc);
1476 CALL_TXH(ieee80211_tx_h_ps_buf);
1477 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1478 CALL_TXH(ieee80211_tx_h_select_key);
1479 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1480 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1482 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1483 __skb_queue_tail(&tx->skbs, tx->skb);
1488 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1489 CALL_TXH(ieee80211_tx_h_sequence);
1490 CALL_TXH(ieee80211_tx_h_fragment);
1491 /* handlers after fragment must be aware of tx info fragmentation! */
1492 CALL_TXH(ieee80211_tx_h_stats);
1493 CALL_TXH(ieee80211_tx_h_encrypt);
1494 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1495 CALL_TXH(ieee80211_tx_h_calculate_duration);
1499 if (unlikely(res == TX_DROP)) {
1500 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1502 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1504 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1506 } else if (unlikely(res == TX_QUEUED)) {
1507 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1514 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1515 struct ieee80211_vif *vif, struct sk_buff *skb,
1516 int band, struct ieee80211_sta **sta)
1518 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1519 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1520 struct ieee80211_tx_data tx;
1521 struct sk_buff *skb2;
1523 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1527 info->control.vif = vif;
1528 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1530 if (invoke_tx_handlers(&tx))
1535 *sta = &tx.sta->sta;
1540 /* this function isn't suitable for fragmented data frames */
1541 skb2 = __skb_dequeue(&tx.skbs);
1542 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1543 ieee80211_free_txskb(hw, skb2);
1544 ieee80211_purge_tx_queue(hw, &tx.skbs);
1550 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1553 * Returns false if the frame couldn't be transmitted but was queued instead.
1555 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1556 struct sta_info *sta, struct sk_buff *skb,
1559 struct ieee80211_local *local = sdata->local;
1560 struct ieee80211_tx_data tx;
1561 ieee80211_tx_result res_prepare;
1562 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1566 if (unlikely(skb->len < 10)) {
1571 /* initialises tx */
1573 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1575 if (unlikely(res_prepare == TX_DROP)) {
1576 ieee80211_free_txskb(&local->hw, skb);
1578 } else if (unlikely(res_prepare == TX_QUEUED)) {
1582 /* set up hw_queue value early */
1583 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1584 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1586 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1588 if (!invoke_tx_handlers(&tx))
1589 result = __ieee80211_tx(local, &tx.skbs, led_len,
1595 /* device xmit handlers */
1597 enum ieee80211_encrypt {
1603 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1604 struct sk_buff *skb,
1606 enum ieee80211_encrypt encrypt)
1608 struct ieee80211_local *local = sdata->local;
1612 enc_tailroom = encrypt == ENCRYPT_MGMT ||
1613 (encrypt == ENCRYPT_DATA &&
1614 sdata->crypto_tx_tailroom_needed_cnt);
1617 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1618 tail_need -= skb_tailroom(skb);
1619 tail_need = max_t(int, tail_need, 0);
1622 if (skb_cloned(skb) &&
1623 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1624 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
1625 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1626 else if (head_need || tail_need)
1627 I802_DEBUG_INC(local->tx_expand_skb_head);
1631 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1632 wiphy_debug(local->hw.wiphy,
1633 "failed to reallocate TX buffer\n");
1640 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1641 struct sta_info *sta, struct sk_buff *skb)
1643 struct ieee80211_local *local = sdata->local;
1644 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1645 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1647 enum ieee80211_encrypt encrypt;
1649 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)
1650 encrypt = ENCRYPT_NO;
1651 else if (ieee80211_is_mgmt(hdr->frame_control))
1652 encrypt = ENCRYPT_MGMT;
1654 encrypt = ENCRYPT_DATA;
1656 headroom = local->tx_headroom;
1657 if (encrypt != ENCRYPT_NO)
1658 headroom += sdata->encrypt_headroom;
1659 headroom -= skb_headroom(skb);
1660 headroom = max_t(int, 0, headroom);
1662 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) {
1663 ieee80211_free_txskb(&local->hw, skb);
1667 /* reload after potential resize */
1668 hdr = (struct ieee80211_hdr *) skb->data;
1669 info->control.vif = &sdata->vif;
1671 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1672 if (ieee80211_is_data(hdr->frame_control) &&
1673 is_unicast_ether_addr(hdr->addr1)) {
1674 if (mesh_nexthop_resolve(sdata, skb))
1675 return; /* skb queued: don't free */
1677 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1681 ieee80211_set_qos_hdr(sdata, skb);
1682 ieee80211_tx(sdata, sta, skb, false);
1685 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1687 struct ieee80211_radiotap_iterator iterator;
1688 struct ieee80211_radiotap_header *rthdr =
1689 (struct ieee80211_radiotap_header *) skb->data;
1690 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1691 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1695 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1696 IEEE80211_TX_CTL_DONTFRAG;
1699 * for every radiotap entry that is present
1700 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1701 * entries present, or -EINVAL on error)
1705 ret = ieee80211_radiotap_iterator_next(&iterator);
1710 /* see if this argument is something we can use */
1711 switch (iterator.this_arg_index) {
1713 * You must take care when dereferencing iterator.this_arg
1714 * for multibyte types... the pointer is not aligned. Use
1715 * get_unaligned((type *)iterator.this_arg) to dereference
1716 * iterator.this_arg for type "type" safely on all arches.
1718 case IEEE80211_RADIOTAP_FLAGS:
1719 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1721 * this indicates that the skb we have been
1722 * handed has the 32-bit FCS CRC at the end...
1723 * we should react to that by snipping it off
1724 * because it will be recomputed and added
1727 if (skb->len < (iterator._max_length + FCS_LEN))
1730 skb_trim(skb, skb->len - FCS_LEN);
1732 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1733 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1734 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1735 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1738 case IEEE80211_RADIOTAP_TX_FLAGS:
1739 txflags = get_unaligned_le16(iterator.this_arg);
1740 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1741 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1745 * Please update the file
1746 * Documentation/networking/mac80211-injection.txt
1747 * when parsing new fields here.
1755 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1759 * remove the radiotap header
1760 * iterator->_max_length was sanity-checked against
1761 * skb->len by iterator init
1763 skb_pull(skb, iterator._max_length);
1768 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1769 struct net_device *dev)
1771 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1772 struct ieee80211_chanctx_conf *chanctx_conf;
1773 struct ieee80211_radiotap_header *prthdr =
1774 (struct ieee80211_radiotap_header *)skb->data;
1775 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1776 struct ieee80211_hdr *hdr;
1777 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1778 struct cfg80211_chan_def *chandef;
1782 /* check for not even having the fixed radiotap header part */
1783 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1784 goto fail; /* too short to be possibly valid */
1786 /* is it a header version we can trust to find length from? */
1787 if (unlikely(prthdr->it_version))
1788 goto fail; /* only version 0 is supported */
1790 /* then there must be a radiotap header with a length we can use */
1791 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1793 /* does the skb contain enough to deliver on the alleged length? */
1794 if (unlikely(skb->len < len_rthdr))
1795 goto fail; /* skb too short for claimed rt header extent */
1798 * fix up the pointers accounting for the radiotap
1799 * header still being in there. We are being given
1800 * a precooked IEEE80211 header so no need for
1803 skb_set_mac_header(skb, len_rthdr);
1805 * these are just fixed to the end of the rt area since we
1806 * don't have any better information and at this point, nobody cares
1808 skb_set_network_header(skb, len_rthdr);
1809 skb_set_transport_header(skb, len_rthdr);
1811 if (skb->len < len_rthdr + 2)
1814 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1815 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1817 if (skb->len < len_rthdr + hdrlen)
1821 * Initialize skb->protocol if the injected frame is a data frame
1822 * carrying a rfc1042 header
1824 if (ieee80211_is_data(hdr->frame_control) &&
1825 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1826 u8 *payload = (u8 *)hdr + hdrlen;
1828 if (ether_addr_equal(payload, rfc1042_header))
1829 skb->protocol = cpu_to_be16((payload[6] << 8) |
1833 memset(info, 0, sizeof(*info));
1835 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1836 IEEE80211_TX_CTL_INJECTED;
1838 /* process and remove the injection radiotap header */
1839 if (!ieee80211_parse_tx_radiotap(skb))
1845 * We process outgoing injected frames that have a local address
1846 * we handle as though they are non-injected frames.
1847 * This code here isn't entirely correct, the local MAC address
1848 * isn't always enough to find the interface to use; for proper
1849 * VLAN/WDS support we will need a different mechanism (which
1850 * likely isn't going to be monitor interfaces).
1852 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1854 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1855 if (!ieee80211_sdata_running(tmp_sdata))
1857 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1858 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1859 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1861 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1867 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1868 if (!chanctx_conf) {
1869 tmp_sdata = rcu_dereference(local->monitor_sdata);
1872 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1876 chandef = &chanctx_conf->def;
1877 else if (!local->use_chanctx)
1878 chandef = &local->_oper_chandef;
1883 * Frame injection is not allowed if beaconing is not allowed
1884 * or if we need radar detection. Beaconing is usually not allowed when
1885 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1886 * Passive scan is also used in world regulatory domains where
1887 * your country is not known and as such it should be treated as
1888 * NO TX unless the channel is explicitly allowed in which case
1889 * your current regulatory domain would not have the passive scan
1892 * Since AP mode uses monitor interfaces to inject/TX management
1893 * frames we can make AP mode the exception to this rule once it
1894 * supports radar detection as its implementation can deal with
1895 * radar detection by itself. We can do that later by adding a
1896 * monitor flag interfaces used for AP support.
1898 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1902 info->band = chandef->chan->band;
1903 ieee80211_xmit(sdata, NULL, skb);
1906 return NETDEV_TX_OK;
1912 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1915 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
1917 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
1919 return ethertype == ETH_P_TDLS &&
1921 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1924 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
1925 struct sk_buff *skb,
1926 struct sta_info **sta_out)
1928 struct sta_info *sta;
1930 switch (sdata->vif.type) {
1931 case NL80211_IFTYPE_AP_VLAN:
1932 sta = rcu_dereference(sdata->u.vlan.sta);
1936 } else if (sdata->wdev.use_4addr) {
1940 case NL80211_IFTYPE_AP:
1941 case NL80211_IFTYPE_OCB:
1942 case NL80211_IFTYPE_ADHOC:
1943 if (is_multicast_ether_addr(skb->data)) {
1944 *sta_out = ERR_PTR(-ENOENT);
1947 sta = sta_info_get_bss(sdata, skb->data);
1949 case NL80211_IFTYPE_WDS:
1950 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
1952 #ifdef CONFIG_MAC80211_MESH
1953 case NL80211_IFTYPE_MESH_POINT:
1954 /* determined much later */
1958 case NL80211_IFTYPE_STATION:
1959 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1960 sta = sta_info_get(sdata, skb->data);
1962 bool tdls_peer, tdls_auth;
1964 tdls_peer = test_sta_flag(sta,
1965 WLAN_STA_TDLS_PEER);
1966 tdls_auth = test_sta_flag(sta,
1967 WLAN_STA_TDLS_PEER_AUTH);
1969 if (tdls_peer && tdls_auth) {
1975 * TDLS link during setup - throw out frames to
1976 * peer. Allow TDLS-setup frames to unauthorized
1977 * peers for the special case of a link teardown
1978 * after a TDLS sta is removed due to being
1981 if (tdls_peer && !tdls_auth &&
1982 !ieee80211_is_tdls_setup(skb))
1988 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
1996 *sta_out = sta ?: ERR_PTR(-ENOENT);
2001 * ieee80211_build_hdr - build 802.11 header in the given frame
2002 * @sdata: virtual interface to build the header for
2003 * @skb: the skb to build the header in
2004 * @info_flags: skb flags to set
2006 * This function takes the skb with 802.3 header and reformats the header to
2007 * the appropriate IEEE 802.11 header based on which interface the packet is
2008 * being transmitted on.
2010 * Note that this function also takes care of the TX status request and
2011 * potential unsharing of the SKB - this needs to be interleaved with the
2014 * The function requires the read-side RCU lock held
2016 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2018 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2019 struct sk_buff *skb, u32 info_flags,
2020 struct sta_info *sta)
2022 struct ieee80211_local *local = sdata->local;
2023 struct ieee80211_tx_info *info;
2025 u16 ethertype, hdrlen, meshhdrlen = 0;
2027 struct ieee80211_hdr hdr;
2028 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2029 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2030 const u8 *encaps_data;
2031 int encaps_len, skip_header_bytes;
2033 bool wme_sta = false, authorized = false;
2037 struct ieee80211_chanctx_conf *chanctx_conf;
2038 struct ieee80211_sub_if_data *ap_sdata;
2039 enum ieee80211_band band;
2045 /* convert Ethernet header to proper 802.11 header (based on
2046 * operation mode) */
2047 ethertype = (skb->data[12] << 8) | skb->data[13];
2048 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2050 switch (sdata->vif.type) {
2051 case NL80211_IFTYPE_AP_VLAN:
2052 if (sdata->wdev.use_4addr) {
2053 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2055 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2056 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2057 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2058 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2060 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2061 wme_sta = sta->sta.wme;
2063 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2065 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2066 if (!chanctx_conf) {
2070 band = chanctx_conf->def.chan->band;
2071 if (sdata->wdev.use_4addr)
2074 case NL80211_IFTYPE_AP:
2075 if (sdata->vif.type == NL80211_IFTYPE_AP)
2076 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2077 if (!chanctx_conf) {
2081 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2083 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2084 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2085 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2087 band = chanctx_conf->def.chan->band;
2089 case NL80211_IFTYPE_WDS:
2090 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2092 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2093 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2094 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2095 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2098 * This is the exception! WDS style interfaces are prohibited
2099 * when channel contexts are in used so this must be valid
2101 band = local->hw.conf.chandef.chan->band;
2103 #ifdef CONFIG_MAC80211_MESH
2104 case NL80211_IFTYPE_MESH_POINT:
2105 if (!is_multicast_ether_addr(skb->data)) {
2106 struct sta_info *next_hop;
2107 bool mpp_lookup = true;
2109 mpath = mesh_path_lookup(sdata, skb->data);
2112 next_hop = rcu_dereference(mpath->next_hop);
2114 !(mpath->flags & (MESH_PATH_ACTIVE |
2115 MESH_PATH_RESOLVING)))
2120 mppath = mpp_path_lookup(sdata, skb->data);
2122 if (mppath && mpath)
2123 mesh_path_del(mpath->sdata, mpath->dst);
2127 * Use address extension if it is a packet from
2128 * another interface or if we know the destination
2129 * is being proxied by a portal (i.e. portal address
2130 * differs from proxied address)
2132 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2133 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2134 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2135 skb->data, skb->data + ETH_ALEN);
2136 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2139 /* DS -> MBSS (802.11-2012 13.11.3.3).
2140 * For unicast with unknown forwarding information,
2141 * destination might be in the MBSS or if that fails
2142 * forwarded to another mesh gate. In either case
2143 * resolution will be handled in ieee80211_xmit(), so
2144 * leave the original DA. This also works for mcast */
2145 const u8 *mesh_da = skb->data;
2148 mesh_da = mppath->mpp;
2150 mesh_da = mpath->dst;
2152 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2153 mesh_da, sdata->vif.addr);
2154 if (is_multicast_ether_addr(mesh_da))
2155 /* DA TA mSA AE:SA */
2156 meshhdrlen = ieee80211_new_mesh_header(
2158 skb->data + ETH_ALEN, NULL);
2160 /* RA TA mDA mSA AE:DA SA */
2161 meshhdrlen = ieee80211_new_mesh_header(
2162 sdata, &mesh_hdr, skb->data,
2163 skb->data + ETH_ALEN);
2166 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2167 if (!chanctx_conf) {
2171 band = chanctx_conf->def.chan->band;
2174 case NL80211_IFTYPE_STATION:
2175 /* we already did checks when looking up the RA STA */
2176 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2180 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2181 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2182 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2184 } else if (sdata->u.mgd.use_4addr &&
2185 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2186 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2187 IEEE80211_FCTL_TODS);
2189 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2190 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2191 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2192 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2195 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2197 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2198 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2199 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2202 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2203 if (!chanctx_conf) {
2207 band = chanctx_conf->def.chan->band;
2209 case NL80211_IFTYPE_OCB:
2211 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2212 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2213 eth_broadcast_addr(hdr.addr3);
2215 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2216 if (!chanctx_conf) {
2220 band = chanctx_conf->def.chan->band;
2222 case NL80211_IFTYPE_ADHOC:
2224 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2225 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2226 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2228 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2229 if (!chanctx_conf) {
2233 band = chanctx_conf->def.chan->band;
2240 multicast = is_multicast_ether_addr(hdr.addr1);
2242 /* sta is always NULL for mesh */
2244 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2245 wme_sta = sta->sta.wme;
2246 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2247 /* For mesh, the use of the QoS header is mandatory */
2251 /* receiver does QoS (which also means we do) use it */
2253 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2258 * Drop unicast frames to unauthorised stations unless they are
2259 * EAPOL frames from the local station.
2261 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2262 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2263 !multicast && !authorized &&
2264 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2265 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2266 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2267 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2268 sdata->name, hdr.addr1);
2271 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2277 if (unlikely(!multicast && skb->sk &&
2278 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2279 struct sk_buff *ack_skb = skb_clone_sk(skb);
2282 unsigned long flags;
2285 spin_lock_irqsave(&local->ack_status_lock, flags);
2286 id = idr_alloc(&local->ack_status_frames, ack_skb,
2287 1, 0x10000, GFP_ATOMIC);
2288 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2292 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2300 * If the skb is shared we need to obtain our own copy.
2302 if (skb_shared(skb)) {
2303 struct sk_buff *tmp_skb = skb;
2305 /* can't happen -- skb is a clone if info_id != 0 */
2308 skb = skb_clone(skb, GFP_ATOMIC);
2317 hdr.frame_control = fc;
2318 hdr.duration_id = 0;
2321 skip_header_bytes = ETH_HLEN;
2322 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2323 encaps_data = bridge_tunnel_header;
2324 encaps_len = sizeof(bridge_tunnel_header);
2325 skip_header_bytes -= 2;
2326 } else if (ethertype >= ETH_P_802_3_MIN) {
2327 encaps_data = rfc1042_header;
2328 encaps_len = sizeof(rfc1042_header);
2329 skip_header_bytes -= 2;
2335 nh_pos = skb_network_header(skb) - skb->data;
2336 h_pos = skb_transport_header(skb) - skb->data;
2338 skb_pull(skb, skip_header_bytes);
2339 nh_pos -= skip_header_bytes;
2340 h_pos -= skip_header_bytes;
2342 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2345 * So we need to modify the skb header and hence need a copy of
2346 * that. The head_need variable above doesn't, so far, include
2347 * the needed header space that we don't need right away. If we
2348 * can, then we don't reallocate right now but only after the
2349 * frame arrives at the master device (if it does...)
2351 * If we cannot, however, then we will reallocate to include all
2352 * the ever needed space. Also, if we need to reallocate it anyway,
2353 * make it big enough for everything we may ever need.
2356 if (head_need > 0 || skb_cloned(skb)) {
2357 head_need += sdata->encrypt_headroom;
2358 head_need += local->tx_headroom;
2359 head_need = max_t(int, 0, head_need);
2360 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) {
2361 ieee80211_free_txskb(&local->hw, skb);
2363 return ERR_PTR(-ENOMEM);
2368 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2369 nh_pos += encaps_len;
2370 h_pos += encaps_len;
2373 #ifdef CONFIG_MAC80211_MESH
2374 if (meshhdrlen > 0) {
2375 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2376 nh_pos += meshhdrlen;
2377 h_pos += meshhdrlen;
2381 if (ieee80211_is_data_qos(fc)) {
2382 __le16 *qos_control;
2384 qos_control = (__le16 *) skb_push(skb, 2);
2385 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2387 * Maybe we could actually set some fields here, for now just
2388 * initialise to zero to indicate no special operation.
2392 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2397 /* Update skb pointers to various headers since this modified frame
2398 * is going to go through Linux networking code that may potentially
2399 * need things like pointer to IP header. */
2400 skb_set_mac_header(skb, 0);
2401 skb_set_network_header(skb, nh_pos);
2402 skb_set_transport_header(skb, h_pos);
2404 info = IEEE80211_SKB_CB(skb);
2405 memset(info, 0, sizeof(*info));
2407 info->flags = info_flags;
2408 info->ack_frame_id = info_id;
2414 return ERR_PTR(ret);
2418 * fast-xmit overview
2420 * The core idea of this fast-xmit is to remove per-packet checks by checking
2421 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2422 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2423 * much less work can be done per packet. For example, fragmentation must be
2424 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2427 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2428 * header and other data to aid packet processing in ieee80211_xmit_fast().
2430 * The most difficult part of this is that when any of these assumptions
2431 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2432 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2433 * since the per-packet code no longer checks the conditions. This is reflected
2434 * by the calls to these functions throughout the rest of the code, and must be
2435 * maintained if any of the TX path checks change.
2438 void ieee80211_check_fast_xmit(struct sta_info *sta)
2440 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2441 struct ieee80211_local *local = sta->local;
2442 struct ieee80211_sub_if_data *sdata = sta->sdata;
2443 struct ieee80211_hdr *hdr = (void *)build.hdr;
2444 struct ieee80211_chanctx_conf *chanctx_conf;
2447 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2450 /* Locking here protects both the pointer itself, and against concurrent
2451 * invocations winning data access races to, e.g., the key pointer that
2453 * Without it, the invocation of this function right after the key
2454 * pointer changes wouldn't be sufficient, as another CPU could access
2455 * the pointer, then stall, and then do the cache update after the CPU
2456 * that invalidated the key.
2457 * With the locking, such scenarios cannot happen as the check for the
2458 * key and the fast-tx assignment are done atomically, so the CPU that
2459 * modifies the key will either wait or other one will see the key
2460 * cleared/changed already.
2462 spin_lock_bh(&sta->lock);
2463 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2464 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2465 sdata->vif.type == NL80211_IFTYPE_STATION)
2468 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2471 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2472 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2473 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2474 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2477 if (sdata->noack_map)
2480 /* fast-xmit doesn't handle fragmentation at all */
2481 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2482 !local->ops->set_frag_threshold)
2486 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2487 if (!chanctx_conf) {
2491 build.band = chanctx_conf->def.chan->band;
2494 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2496 switch (sdata->vif.type) {
2497 case NL80211_IFTYPE_ADHOC:
2499 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2500 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2501 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2504 case NL80211_IFTYPE_STATION:
2505 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2507 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2508 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2509 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2514 if (sdata->u.mgd.use_4addr) {
2515 /* non-regular ethertype cannot use the fastpath */
2516 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2517 IEEE80211_FCTL_TODS);
2519 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2520 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2521 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2522 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2526 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2528 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2529 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2530 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2533 case NL80211_IFTYPE_AP_VLAN:
2534 if (sdata->wdev.use_4addr) {
2535 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2536 IEEE80211_FCTL_TODS);
2538 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2539 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2540 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2541 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2546 case NL80211_IFTYPE_AP:
2547 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2549 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2550 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2551 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2555 /* not handled on fast-xmit */
2561 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2564 /* We store the key here so there's no point in using rcu_dereference()
2565 * but that's fine because the code that changes the pointers will call
2566 * this function after doing so. For a single CPU that would be enough,
2567 * for multiple see the comment above.
2569 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2571 build.key = rcu_access_pointer(sdata->default_unicast_key);
2573 bool gen_iv, iv_spc, mmic;
2575 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2576 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2577 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2579 /* don't handle software crypto */
2580 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2583 switch (build.key->conf.cipher) {
2584 case WLAN_CIPHER_SUITE_CCMP:
2585 case WLAN_CIPHER_SUITE_CCMP_256:
2586 /* add fixed key ID */
2588 (build.hdr + build.hdr_len)[3] =
2589 0x20 | (build.key->conf.keyidx << 6);
2590 build.pn_offs = build.hdr_len;
2592 if (gen_iv || iv_spc)
2593 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2595 case WLAN_CIPHER_SUITE_GCMP:
2596 case WLAN_CIPHER_SUITE_GCMP_256:
2597 /* add fixed key ID */
2599 (build.hdr + build.hdr_len)[3] =
2600 0x20 | (build.key->conf.keyidx << 6);
2601 build.pn_offs = build.hdr_len;
2603 if (gen_iv || iv_spc)
2604 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2606 case WLAN_CIPHER_SUITE_TKIP:
2607 /* cannot handle MMIC or IV generation in xmit-fast */
2611 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2613 case WLAN_CIPHER_SUITE_WEP40:
2614 case WLAN_CIPHER_SUITE_WEP104:
2615 /* cannot handle IV generation in fast-xmit */
2619 build.hdr_len += IEEE80211_WEP_IV_LEN;
2621 case WLAN_CIPHER_SUITE_AES_CMAC:
2622 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2623 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2624 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2626 "management cipher suite 0x%x enabled for data\n",
2627 build.key->conf.cipher);
2630 /* we don't know how to generate IVs for this at all */
2631 if (WARN_ON(gen_iv))
2633 /* pure hardware keys are OK, of course */
2634 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2636 /* cipher scheme might require space allocation */
2638 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2641 build.hdr_len += build.key->conf.iv_len;
2644 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2647 hdr->frame_control = fc;
2649 memcpy(build.hdr + build.hdr_len,
2650 rfc1042_header, sizeof(rfc1042_header));
2651 build.hdr_len += sizeof(rfc1042_header);
2653 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2654 /* if the kmemdup fails, continue w/o fast_tx */
2659 /* we might have raced against another call to this function */
2660 old = rcu_dereference_protected(sta->fast_tx,
2661 lockdep_is_held(&sta->lock));
2662 rcu_assign_pointer(sta->fast_tx, fast_tx);
2664 kfree_rcu(old, rcu_head);
2665 spin_unlock_bh(&sta->lock);
2668 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2670 struct sta_info *sta;
2673 list_for_each_entry_rcu(sta, &local->sta_list, list)
2674 ieee80211_check_fast_xmit(sta);
2678 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2680 struct ieee80211_local *local = sdata->local;
2681 struct sta_info *sta;
2685 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2686 if (sdata != sta->sdata &&
2687 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
2689 ieee80211_check_fast_xmit(sta);
2695 void ieee80211_clear_fast_xmit(struct sta_info *sta)
2697 struct ieee80211_fast_tx *fast_tx;
2699 spin_lock_bh(&sta->lock);
2700 fast_tx = rcu_dereference_protected(sta->fast_tx,
2701 lockdep_is_held(&sta->lock));
2702 RCU_INIT_POINTER(sta->fast_tx, NULL);
2703 spin_unlock_bh(&sta->lock);
2706 kfree_rcu(fast_tx, rcu_head);
2709 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
2710 struct net_device *dev, struct sta_info *sta,
2711 struct ieee80211_fast_tx *fast_tx,
2712 struct sk_buff *skb)
2714 struct ieee80211_local *local = sdata->local;
2715 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2716 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
2717 int hw_headroom = sdata->local->hw.extra_tx_headroom;
2719 struct ieee80211_tx_info *info;
2720 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
2721 struct ieee80211_tx_data tx;
2722 ieee80211_tx_result r;
2723 struct tid_ampdu_tx *tid_tx = NULL;
2724 u8 tid = IEEE80211_NUM_TIDS;
2726 /* control port protocol needs a lot of special handling */
2727 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
2730 /* only RFC 1042 SNAP */
2731 if (ethertype < ETH_P_802_3_MIN)
2734 /* don't handle TX status request here either */
2735 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
2738 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2739 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2740 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
2742 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2744 if (tid_tx->timeout)
2745 tid_tx->last_tx = jiffies;
2749 /* after this point (skb is modified) we cannot return false */
2751 if (skb_shared(skb)) {
2752 struct sk_buff *tmp_skb = skb;
2754 skb = skb_clone(skb, GFP_ATOMIC);
2761 ieee80211_tx_stats(dev, skb->len + extra_head);
2763 /* will not be crypto-handled beyond what we do here, so use false
2764 * as the may-encrypt argument for the resize to not account for
2765 * more room than we already have in 'extra_head'
2767 if (unlikely(ieee80211_skb_resize(sdata, skb,
2768 max_t(int, extra_head + hw_headroom -
2769 skb_headroom(skb), 0),
2775 memcpy(ð, skb->data, ETH_HLEN - 2);
2776 hdr = (void *)skb_push(skb, extra_head);
2777 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
2778 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
2779 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
2781 info = IEEE80211_SKB_CB(skb);
2782 memset(info, 0, sizeof(*info));
2783 info->band = fast_tx->band;
2784 info->control.vif = &sdata->vif;
2785 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
2786 IEEE80211_TX_CTL_DONTFRAG |
2787 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
2789 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2790 *ieee80211_get_qos_ctl(hdr) = tid;
2791 if (!sta->sta.txq[0])
2792 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
2794 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2795 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
2796 sdata->sequence_number += 0x10;
2799 if (skb_shinfo(skb)->gso_size)
2800 sta->tx_stats.msdu[tid] +=
2801 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
2803 sta->tx_stats.msdu[tid]++;
2805 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
2807 __skb_queue_head_init(&tx.skbs);
2809 tx.flags = IEEE80211_TX_UNICAST;
2813 tx.key = fast_tx->key;
2816 info->control.hw_key = &fast_tx->key->conf;
2818 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
2820 r = ieee80211_tx_h_rate_ctrl(&tx);
2824 if (r != TX_CONTINUE) {
2831 /* statistics normally done by ieee80211_tx_h_stats (but that
2832 * has to consider fragmentation, so is more complex)
2834 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
2835 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
2837 if (fast_tx->pn_offs) {
2839 u8 *crypto_hdr = skb->data + fast_tx->pn_offs;
2841 switch (fast_tx->key->conf.cipher) {
2842 case WLAN_CIPHER_SUITE_CCMP:
2843 case WLAN_CIPHER_SUITE_CCMP_256:
2844 case WLAN_CIPHER_SUITE_GCMP:
2845 case WLAN_CIPHER_SUITE_GCMP_256:
2846 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
2848 crypto_hdr[1] = pn >> 8;
2849 crypto_hdr[4] = pn >> 16;
2850 crypto_hdr[5] = pn >> 24;
2851 crypto_hdr[6] = pn >> 32;
2852 crypto_hdr[7] = pn >> 40;
2857 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2858 sdata = container_of(sdata->bss,
2859 struct ieee80211_sub_if_data, u.ap);
2861 __skb_queue_tail(&tx.skbs, skb);
2862 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
2866 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2867 struct net_device *dev,
2870 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2871 struct sta_info *sta;
2872 struct sk_buff *next;
2874 if (unlikely(skb->len < ETH_HLEN)) {
2881 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
2884 if (!IS_ERR_OR_NULL(sta)) {
2885 struct ieee80211_fast_tx *fast_tx;
2887 fast_tx = rcu_dereference(sta->fast_tx);
2890 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
2894 if (skb_is_gso(skb)) {
2895 struct sk_buff *segs;
2897 segs = skb_gso_segment(skb, 0);
2905 /* we cannot process non-linear frames on this path */
2906 if (skb_linearize(skb)) {
2911 /* the frame could be fragmented, software-encrypted, and other
2912 * things so we cannot really handle checksum offload with it -
2913 * fix it up in software before we handle anything else.
2915 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2916 skb_set_transport_header(skb,
2917 skb_checksum_start_offset(skb));
2918 if (skb_checksum_help(skb))
2931 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2935 ieee80211_tx_stats(dev, skb->len);
2937 ieee80211_xmit(sdata, sta, skb);
2947 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2948 * @skb: packet to be sent
2949 * @dev: incoming interface
2951 * On failure skb will be freed.
2953 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
2954 struct net_device *dev)
2956 __ieee80211_subif_start_xmit(skb, dev, 0);
2957 return NETDEV_TX_OK;
2961 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
2962 struct sk_buff *skb, u32 info_flags)
2964 struct ieee80211_hdr *hdr;
2965 struct ieee80211_tx_data tx = {
2966 .local = sdata->local,
2969 struct sta_info *sta;
2973 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
2975 skb = ERR_PTR(-EINVAL);
2979 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2983 hdr = (void *)skb->data;
2984 tx.sta = sta_info_get(sdata, hdr->addr1);
2987 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
2990 return ERR_PTR(-EINVAL);
2999 * ieee80211_clear_tx_pending may not be called in a context where
3000 * it is possible that it packets could come in again.
3002 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3004 struct sk_buff *skb;
3007 for (i = 0; i < local->hw.queues; i++) {
3008 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3009 ieee80211_free_txskb(&local->hw, skb);
3014 * Returns false if the frame couldn't be transmitted but was queued instead,
3015 * which in this case means re-queued -- take as an indication to stop sending
3016 * more pending frames.
3018 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3019 struct sk_buff *skb)
3021 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3022 struct ieee80211_sub_if_data *sdata;
3023 struct sta_info *sta;
3024 struct ieee80211_hdr *hdr;
3026 struct ieee80211_chanctx_conf *chanctx_conf;
3028 sdata = vif_to_sdata(info->control.vif);
3030 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3031 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3032 if (unlikely(!chanctx_conf)) {
3036 info->band = chanctx_conf->def.chan->band;
3037 result = ieee80211_tx(sdata, NULL, skb, true);
3039 struct sk_buff_head skbs;
3041 __skb_queue_head_init(&skbs);
3042 __skb_queue_tail(&skbs, skb);
3044 hdr = (struct ieee80211_hdr *)skb->data;
3045 sta = sta_info_get(sdata, hdr->addr1);
3047 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3054 * Transmit all pending packets. Called from tasklet.
3056 void ieee80211_tx_pending(unsigned long data)
3058 struct ieee80211_local *local = (struct ieee80211_local *)data;
3059 unsigned long flags;
3065 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3066 for (i = 0; i < local->hw.queues; i++) {
3068 * If queue is stopped by something other than due to pending
3069 * frames, or we have no pending frames, proceed to next queue.
3071 if (local->queue_stop_reasons[i] ||
3072 skb_queue_empty(&local->pending[i]))
3075 while (!skb_queue_empty(&local->pending[i])) {
3076 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3077 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3079 if (WARN_ON(!info->control.vif)) {
3080 ieee80211_free_txskb(&local->hw, skb);
3084 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3087 txok = ieee80211_tx_pending_skb(local, skb);
3088 spin_lock_irqsave(&local->queue_stop_reason_lock,
3094 if (skb_queue_empty(&local->pending[i]))
3095 ieee80211_propagate_queue_wake(local, i);
3097 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3102 /* functions for drivers to get certain frames */
3104 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3105 struct ps_data *ps, struct sk_buff *skb,
3110 int i, have_bits = 0, n1, n2;
3112 /* Generate bitmap for TIM only if there are any STAs in power save
3114 if (atomic_read(&ps->num_sta_ps) > 0)
3115 /* in the hope that this is faster than
3116 * checking byte-for-byte */
3117 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3118 IEEE80211_MAX_AID+1);
3120 if (ps->dtim_count == 0)
3121 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3126 tim = pos = (u8 *) skb_put(skb, 6);
3127 *pos++ = WLAN_EID_TIM;
3129 *pos++ = ps->dtim_count;
3130 *pos++ = sdata->vif.bss_conf.dtim_period;
3132 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3135 ps->dtim_bc_mc = aid0 == 1;
3138 /* Find largest even number N1 so that bits numbered 1 through
3139 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3140 * (N2 + 1) x 8 through 2007 are 0. */
3142 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3149 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3156 /* Bitmap control */
3158 /* Part Virt Bitmap */
3159 skb_put(skb, n2 - n1);
3160 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3162 tim[1] = n2 - n1 + 4;
3164 *pos++ = aid0; /* Bitmap control */
3165 *pos++ = 0; /* Part Virt Bitmap */
3169 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3170 struct ps_data *ps, struct sk_buff *skb,
3173 struct ieee80211_local *local = sdata->local;
3176 * Not very nice, but we want to allow the driver to call
3177 * ieee80211_beacon_get() as a response to the set_tim()
3178 * callback. That, however, is already invoked under the
3179 * sta_lock to guarantee consistent and race-free update
3180 * of the tim bitmap in mac80211 and the driver.
3182 if (local->tim_in_locked_section) {
3183 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3185 spin_lock_bh(&local->tim_lock);
3186 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3187 spin_unlock_bh(&local->tim_lock);
3193 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3194 struct beacon_data *beacon)
3196 struct probe_resp *resp;
3198 size_t beacon_data_len;
3200 u8 count = beacon->csa_current_counter;
3202 switch (sdata->vif.type) {
3203 case NL80211_IFTYPE_AP:
3204 beacon_data = beacon->tail;
3205 beacon_data_len = beacon->tail_len;
3207 case NL80211_IFTYPE_ADHOC:
3208 beacon_data = beacon->head;
3209 beacon_data_len = beacon->head_len;
3211 case NL80211_IFTYPE_MESH_POINT:
3212 beacon_data = beacon->head;
3213 beacon_data_len = beacon->head_len;
3220 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3221 resp = rcu_dereference(sdata->u.ap.probe_resp);
3223 if (beacon->csa_counter_offsets[i]) {
3224 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3230 beacon_data[beacon->csa_counter_offsets[i]] = count;
3233 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3234 resp->data[resp->csa_counter_offsets[i]] = count;
3239 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3241 beacon->csa_current_counter--;
3243 /* the counter should never reach 0 */
3244 WARN_ON_ONCE(!beacon->csa_current_counter);
3246 return beacon->csa_current_counter;
3249 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3251 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3252 struct beacon_data *beacon = NULL;
3257 if (sdata->vif.type == NL80211_IFTYPE_AP)
3258 beacon = rcu_dereference(sdata->u.ap.beacon);
3259 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3260 beacon = rcu_dereference(sdata->u.ibss.presp);
3261 else if (ieee80211_vif_is_mesh(&sdata->vif))
3262 beacon = rcu_dereference(sdata->u.mesh.beacon);
3267 count = __ieee80211_csa_update_counter(beacon);
3273 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3275 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3277 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3278 struct beacon_data *beacon = NULL;
3280 size_t beacon_data_len;
3283 if (!ieee80211_sdata_running(sdata))
3287 if (vif->type == NL80211_IFTYPE_AP) {
3288 struct ieee80211_if_ap *ap = &sdata->u.ap;
3290 beacon = rcu_dereference(ap->beacon);
3291 if (WARN_ON(!beacon || !beacon->tail))
3293 beacon_data = beacon->tail;
3294 beacon_data_len = beacon->tail_len;
3295 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3296 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3298 beacon = rcu_dereference(ifibss->presp);
3302 beacon_data = beacon->head;
3303 beacon_data_len = beacon->head_len;
3304 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3305 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3307 beacon = rcu_dereference(ifmsh->beacon);
3311 beacon_data = beacon->head;
3312 beacon_data_len = beacon->head_len;
3318 if (!beacon->csa_counter_offsets[0])
3321 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3324 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3331 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3333 static struct sk_buff *
3334 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3335 struct ieee80211_vif *vif,
3336 struct ieee80211_mutable_offsets *offs,
3339 struct ieee80211_local *local = hw_to_local(hw);
3340 struct beacon_data *beacon = NULL;
3341 struct sk_buff *skb = NULL;
3342 struct ieee80211_tx_info *info;
3343 struct ieee80211_sub_if_data *sdata = NULL;
3344 enum ieee80211_band band;
3345 struct ieee80211_tx_rate_control txrc;
3346 struct ieee80211_chanctx_conf *chanctx_conf;
3347 int csa_off_base = 0;
3351 sdata = vif_to_sdata(vif);
3352 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3354 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3358 memset(offs, 0, sizeof(*offs));
3360 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3361 struct ieee80211_if_ap *ap = &sdata->u.ap;
3363 beacon = rcu_dereference(ap->beacon);
3365 if (beacon->csa_counter_offsets[0]) {
3367 __ieee80211_csa_update_counter(beacon);
3369 ieee80211_set_csa(sdata, beacon);
3373 * headroom, head length,
3374 * tail length and maximum TIM length
3376 skb = dev_alloc_skb(local->tx_headroom +
3378 beacon->tail_len + 256 +
3379 local->hw.extra_beacon_tailroom);
3383 skb_reserve(skb, local->tx_headroom);
3384 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3387 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3391 offs->tim_offset = beacon->head_len;
3392 offs->tim_length = skb->len - beacon->head_len;
3394 /* for AP the csa offsets are from tail */
3395 csa_off_base = skb->len;
3399 memcpy(skb_put(skb, beacon->tail_len),
3400 beacon->tail, beacon->tail_len);
3403 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
3404 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3405 struct ieee80211_hdr *hdr;
3407 beacon = rcu_dereference(ifibss->presp);
3411 if (beacon->csa_counter_offsets[0]) {
3413 __ieee80211_csa_update_counter(beacon);
3415 ieee80211_set_csa(sdata, beacon);
3418 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
3419 local->hw.extra_beacon_tailroom);
3422 skb_reserve(skb, local->tx_headroom);
3423 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3426 hdr = (struct ieee80211_hdr *) skb->data;
3427 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3428 IEEE80211_STYPE_BEACON);
3429 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3430 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3432 beacon = rcu_dereference(ifmsh->beacon);
3436 if (beacon->csa_counter_offsets[0]) {
3438 /* TODO: For mesh csa_counter is in TU, so
3439 * decrementing it by one isn't correct, but
3440 * for now we leave it consistent with overall
3441 * mac80211's behavior.
3443 __ieee80211_csa_update_counter(beacon);
3445 ieee80211_set_csa(sdata, beacon);
3448 if (ifmsh->sync_ops)
3449 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
3451 skb = dev_alloc_skb(local->tx_headroom +
3455 local->hw.extra_beacon_tailroom);
3458 skb_reserve(skb, local->tx_headroom);
3459 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3461 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
3464 offs->tim_offset = beacon->head_len;
3465 offs->tim_length = skb->len - beacon->head_len;
3468 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
3476 if (offs && beacon) {
3479 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
3480 u16 csa_off = beacon->csa_counter_offsets[i];
3485 offs->csa_counter_offs[i] = csa_off_base + csa_off;
3489 band = chanctx_conf->def.chan->band;
3491 info = IEEE80211_SKB_CB(skb);
3493 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
3494 info->flags |= IEEE80211_TX_CTL_NO_ACK;
3497 memset(&txrc, 0, sizeof(txrc));
3499 txrc.sband = local->hw.wiphy->bands[band];
3500 txrc.bss_conf = &sdata->vif.bss_conf;
3502 txrc.reported_rate.idx = -1;
3503 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
3504 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
3505 txrc.max_rate_idx = -1;
3507 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
3509 rate_control_get_rate(sdata, NULL, &txrc);
3511 info->control.vif = vif;
3513 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
3514 IEEE80211_TX_CTL_ASSIGN_SEQ |
3515 IEEE80211_TX_CTL_FIRST_FRAGMENT;
3523 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
3524 struct ieee80211_vif *vif,
3525 struct ieee80211_mutable_offsets *offs)
3527 return __ieee80211_beacon_get(hw, vif, offs, true);
3529 EXPORT_SYMBOL(ieee80211_beacon_get_template);
3531 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
3532 struct ieee80211_vif *vif,
3533 u16 *tim_offset, u16 *tim_length)
3535 struct ieee80211_mutable_offsets offs = {};
3536 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
3537 struct sk_buff *copy;
3538 struct ieee80211_supported_band *sband;
3545 *tim_offset = offs.tim_offset;
3548 *tim_length = offs.tim_length;
3550 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
3551 !hw_to_local(hw)->monitors)
3554 /* send a copy to monitor interfaces */
3555 copy = skb_copy(bcn, GFP_ATOMIC);
3559 shift = ieee80211_vif_get_shift(vif);
3560 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
3561 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
3565 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
3567 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
3568 struct ieee80211_vif *vif)
3570 struct ieee80211_if_ap *ap = NULL;
3571 struct sk_buff *skb = NULL;
3572 struct probe_resp *presp = NULL;
3573 struct ieee80211_hdr *hdr;
3574 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3576 if (sdata->vif.type != NL80211_IFTYPE_AP)
3582 presp = rcu_dereference(ap->probe_resp);
3586 skb = dev_alloc_skb(presp->len);
3590 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
3592 hdr = (struct ieee80211_hdr *) skb->data;
3593 memset(hdr->addr1, 0, sizeof(hdr->addr1));
3599 EXPORT_SYMBOL(ieee80211_proberesp_get);
3601 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
3602 struct ieee80211_vif *vif)
3604 struct ieee80211_sub_if_data *sdata;
3605 struct ieee80211_if_managed *ifmgd;
3606 struct ieee80211_pspoll *pspoll;
3607 struct ieee80211_local *local;
3608 struct sk_buff *skb;
3610 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3613 sdata = vif_to_sdata(vif);
3614 ifmgd = &sdata->u.mgd;
3615 local = sdata->local;
3617 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
3621 skb_reserve(skb, local->hw.extra_tx_headroom);
3623 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
3624 memset(pspoll, 0, sizeof(*pspoll));
3625 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
3626 IEEE80211_STYPE_PSPOLL);
3627 pspoll->aid = cpu_to_le16(ifmgd->aid);
3629 /* aid in PS-Poll has its two MSBs each set to 1 */
3630 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
3632 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
3633 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
3637 EXPORT_SYMBOL(ieee80211_pspoll_get);
3639 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
3640 struct ieee80211_vif *vif)
3642 struct ieee80211_hdr_3addr *nullfunc;
3643 struct ieee80211_sub_if_data *sdata;
3644 struct ieee80211_if_managed *ifmgd;
3645 struct ieee80211_local *local;
3646 struct sk_buff *skb;
3648 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3651 sdata = vif_to_sdata(vif);
3652 ifmgd = &sdata->u.mgd;
3653 local = sdata->local;
3655 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
3659 skb_reserve(skb, local->hw.extra_tx_headroom);
3661 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
3663 memset(nullfunc, 0, sizeof(*nullfunc));
3664 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
3665 IEEE80211_STYPE_NULLFUNC |
3666 IEEE80211_FCTL_TODS);
3667 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
3668 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
3669 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
3673 EXPORT_SYMBOL(ieee80211_nullfunc_get);
3675 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
3677 const u8 *ssid, size_t ssid_len,
3680 struct ieee80211_local *local = hw_to_local(hw);
3681 struct ieee80211_hdr_3addr *hdr;
3682 struct sk_buff *skb;
3686 ie_ssid_len = 2 + ssid_len;
3688 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
3689 ie_ssid_len + tailroom);
3693 skb_reserve(skb, local->hw.extra_tx_headroom);
3695 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3696 memset(hdr, 0, sizeof(*hdr));
3697 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3698 IEEE80211_STYPE_PROBE_REQ);
3699 eth_broadcast_addr(hdr->addr1);
3700 memcpy(hdr->addr2, src_addr, ETH_ALEN);
3701 eth_broadcast_addr(hdr->addr3);
3703 pos = skb_put(skb, ie_ssid_len);
3704 *pos++ = WLAN_EID_SSID;
3707 memcpy(pos, ssid, ssid_len);
3712 EXPORT_SYMBOL(ieee80211_probereq_get);
3714 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3715 const void *frame, size_t frame_len,
3716 const struct ieee80211_tx_info *frame_txctl,
3717 struct ieee80211_rts *rts)
3719 const struct ieee80211_hdr *hdr = frame;
3721 rts->frame_control =
3722 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3723 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3725 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3726 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3728 EXPORT_SYMBOL(ieee80211_rts_get);
3730 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3731 const void *frame, size_t frame_len,
3732 const struct ieee80211_tx_info *frame_txctl,
3733 struct ieee80211_cts *cts)
3735 const struct ieee80211_hdr *hdr = frame;
3737 cts->frame_control =
3738 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3739 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3740 frame_len, frame_txctl);
3741 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3743 EXPORT_SYMBOL(ieee80211_ctstoself_get);
3746 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3747 struct ieee80211_vif *vif)
3749 struct ieee80211_local *local = hw_to_local(hw);
3750 struct sk_buff *skb = NULL;
3751 struct ieee80211_tx_data tx;
3752 struct ieee80211_sub_if_data *sdata;
3754 struct ieee80211_tx_info *info;
3755 struct ieee80211_chanctx_conf *chanctx_conf;
3757 sdata = vif_to_sdata(vif);
3760 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3765 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3766 struct beacon_data *beacon =
3767 rcu_dereference(sdata->u.ap.beacon);
3769 if (!beacon || !beacon->head)
3772 ps = &sdata->u.ap.ps;
3773 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3774 ps = &sdata->u.mesh.ps;
3779 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3780 goto out; /* send buffered bc/mc only after DTIM beacon */
3783 skb = skb_dequeue(&ps->bc_buf);
3786 local->total_ps_buffered--;
3788 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3789 struct ieee80211_hdr *hdr =
3790 (struct ieee80211_hdr *) skb->data;
3791 /* more buffered multicast/broadcast frames ==> set
3792 * MoreData flag in IEEE 802.11 header to inform PS
3794 hdr->frame_control |=
3795 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3798 if (sdata->vif.type == NL80211_IFTYPE_AP)
3799 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3800 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
3802 ieee80211_free_txskb(hw, skb);
3805 info = IEEE80211_SKB_CB(skb);
3807 tx.flags |= IEEE80211_TX_PS_BUFFERED;
3808 info->band = chanctx_conf->def.chan->band;
3810 if (invoke_tx_handlers(&tx))
3817 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3819 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3821 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3822 struct ieee80211_sub_if_data *sdata = sta->sdata;
3823 struct ieee80211_local *local = sdata->local;
3827 lockdep_assert_held(&local->sta_mtx);
3829 /* only some cases are supported right now */
3830 switch (sdata->vif.type) {
3831 case NL80211_IFTYPE_STATION:
3832 case NL80211_IFTYPE_AP:
3833 case NL80211_IFTYPE_AP_VLAN:
3840 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3843 if (sta->reserved_tid == tid) {
3848 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3849 sdata_err(sdata, "TID reservation already active\n");
3854 ieee80211_stop_vif_queues(sdata->local, sdata,
3855 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3859 /* Tear down BA sessions so we stop aggregating on this TID */
3860 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
3861 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3862 __ieee80211_stop_tx_ba_session(sta, tid,
3863 AGG_STOP_LOCAL_REQUEST);
3866 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3867 __ieee80211_flush_queues(local, sdata, queues, false);
3869 sta->reserved_tid = tid;
3871 ieee80211_wake_vif_queues(local, sdata,
3872 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3874 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
3875 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3881 EXPORT_SYMBOL(ieee80211_reserve_tid);
3883 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3885 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3886 struct ieee80211_sub_if_data *sdata = sta->sdata;
3888 lockdep_assert_held(&sdata->local->sta_mtx);
3890 /* only some cases are supported right now */
3891 switch (sdata->vif.type) {
3892 case NL80211_IFTYPE_STATION:
3893 case NL80211_IFTYPE_AP:
3894 case NL80211_IFTYPE_AP_VLAN:
3901 if (tid != sta->reserved_tid) {
3902 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3906 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3908 EXPORT_SYMBOL(ieee80211_unreserve_tid);
3910 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3911 struct sk_buff *skb, int tid,
3912 enum ieee80211_band band)
3914 int ac = ieee802_1d_to_ac[tid & 7];
3916 skb_set_mac_header(skb, 0);
3917 skb_set_network_header(skb, 0);
3918 skb_set_transport_header(skb, 0);
3920 skb_set_queue_mapping(skb, ac);
3921 skb->priority = tid;
3923 skb->dev = sdata->dev;
3926 * The other path calling ieee80211_xmit is from the tasklet,
3927 * and while we can handle concurrent transmissions locking
3928 * requirements are that we do not come into tx with bhs on.
3931 IEEE80211_SKB_CB(skb)->band = band;
3932 ieee80211_xmit(sdata, NULL, skb);