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_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);
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 */
435 if (!atomic_read(&ps->num_sta_ps))
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 dev_kfree_skb(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;
713 /* don't ask rate control when rate already injected via radiotap */
714 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
718 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
721 * Lets not bother rate control if we're associated and cannot
722 * talk to the sta. This should not happen.
724 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
725 !rate_usable_index_exists(sband, &tx->sta->sta),
726 "%s: Dropped data frame as no usable bitrate found while "
727 "scanning and associated. Target station: "
728 "%pM on %d GHz band\n",
729 tx->sdata->name, hdr->addr1,
734 * If we're associated with the sta at this point we know we can at
735 * least send the frame at the lowest bit rate.
737 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
739 if (tx->sta && !info->control.skip_table)
740 ratetbl = rcu_dereference(tx->sta->sta.rates);
742 if (unlikely(info->control.rates[0].idx < 0)) {
744 struct ieee80211_tx_rate rate = {
745 .idx = ratetbl->rate[0].idx,
746 .flags = ratetbl->rate[0].flags,
747 .count = ratetbl->rate[0].count
750 if (ratetbl->rate[0].idx < 0)
758 tx->rate = info->control.rates[0];
761 if (txrc.reported_rate.idx < 0) {
762 txrc.reported_rate = tx->rate;
763 if (tx->sta && ieee80211_is_data(hdr->frame_control))
764 tx->sta->tx_stats.last_rate = txrc.reported_rate;
766 tx->sta->tx_stats.last_rate = txrc.reported_rate;
771 if (unlikely(!info->control.rates[0].count))
772 info->control.rates[0].count = 1;
774 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
775 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
776 info->control.rates[0].count = 1;
781 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
783 u16 *seq = &sta->tid_seq[tid];
784 __le16 ret = cpu_to_le16(*seq);
786 /* Increase the sequence number. */
787 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
792 static ieee80211_tx_result debug_noinline
793 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
795 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
796 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
801 * Packet injection may want to control the sequence
802 * number, if we have no matching interface then we
803 * neither assign one ourselves nor ask the driver to.
805 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
808 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
811 if (ieee80211_hdrlen(hdr->frame_control) < 24)
814 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
818 * Anything but QoS data that has a sequence number field
819 * (is long enough) gets a sequence number from the global
820 * counter. QoS data frames with a multicast destination
821 * also use the global counter (802.11-2012 9.3.2.10).
823 if (!ieee80211_is_data_qos(hdr->frame_control) ||
824 is_multicast_ether_addr(hdr->addr1)) {
825 /* driver should assign sequence number */
826 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
827 /* for pure STA mode without beacons, we can do it */
828 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
829 tx->sdata->sequence_number += 0x10;
831 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
836 * This should be true for injected/management frames only, for
837 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
838 * above since they are not QoS-data frames.
843 /* include per-STA, per-TID sequence counter */
845 qc = ieee80211_get_qos_ctl(hdr);
846 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
847 tx->sta->tx_stats.msdu[tid]++;
849 if (!tx->sta->sta.txq[0])
850 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
855 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
856 struct sk_buff *skb, int hdrlen,
859 struct ieee80211_local *local = tx->local;
860 struct ieee80211_tx_info *info;
862 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
863 int pos = hdrlen + per_fragm;
864 int rem = skb->len - hdrlen - per_fragm;
866 if (WARN_ON(rem < 0))
869 /* first fragment was already added to queue by caller */
872 int fraglen = per_fragm;
877 tmp = dev_alloc_skb(local->tx_headroom +
879 tx->sdata->encrypt_headroom +
880 IEEE80211_ENCRYPT_TAILROOM);
884 __skb_queue_tail(&tx->skbs, tmp);
887 local->tx_headroom + tx->sdata->encrypt_headroom);
889 /* copy control information */
890 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
892 info = IEEE80211_SKB_CB(tmp);
893 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
894 IEEE80211_TX_CTL_FIRST_FRAGMENT);
897 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
899 skb_copy_queue_mapping(tmp, skb);
900 tmp->priority = skb->priority;
903 /* copy header and data */
904 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
905 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
910 /* adjust first fragment's length */
911 skb_trim(skb, hdrlen + per_fragm);
915 static ieee80211_tx_result debug_noinline
916 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
918 struct sk_buff *skb = tx->skb;
919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
920 struct ieee80211_hdr *hdr = (void *)skb->data;
921 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
925 /* no matter what happens, tx->skb moves to tx->skbs */
926 __skb_queue_tail(&tx->skbs, skb);
929 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
932 if (tx->local->ops->set_frag_threshold)
936 * Warn when submitting a fragmented A-MPDU frame and drop it.
937 * This scenario is handled in ieee80211_tx_prepare but extra
938 * caution taken here as fragmented ampdu may cause Tx stop.
940 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
943 hdrlen = ieee80211_hdrlen(hdr->frame_control);
945 /* internal error, why isn't DONTFRAG set? */
946 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
950 * Now fragment the frame. This will allocate all the fragments and
951 * chain them (using skb as the first fragment) to skb->next.
952 * During transmission, we will remove the successfully transmitted
953 * fragments from this list. When the low-level driver rejects one
954 * of the fragments then we will simply pretend to accept the skb
955 * but store it away as pending.
957 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
960 /* update duration/seq/flags of fragments */
963 skb_queue_walk(&tx->skbs, skb) {
964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
966 hdr = (void *)skb->data;
967 info = IEEE80211_SKB_CB(skb);
969 if (!skb_queue_is_last(&tx->skbs, skb)) {
970 hdr->frame_control |= morefrags;
972 * No multi-rate retries for fragmented frames, that
973 * would completely throw off the NAV at other STAs.
975 info->control.rates[1].idx = -1;
976 info->control.rates[2].idx = -1;
977 info->control.rates[3].idx = -1;
978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
981 hdr->frame_control &= ~morefrags;
983 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
990 static ieee80211_tx_result debug_noinline
991 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
999 skb_queue_walk(&tx->skbs, skb) {
1000 ac = skb_get_queue_mapping(skb);
1001 tx->sta->tx_stats.bytes[ac] += skb->len;
1004 tx->sta->tx_stats.packets[ac]++;
1009 static ieee80211_tx_result debug_noinline
1010 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1015 switch (tx->key->conf.cipher) {
1016 case WLAN_CIPHER_SUITE_WEP40:
1017 case WLAN_CIPHER_SUITE_WEP104:
1018 return ieee80211_crypto_wep_encrypt(tx);
1019 case WLAN_CIPHER_SUITE_TKIP:
1020 return ieee80211_crypto_tkip_encrypt(tx);
1021 case WLAN_CIPHER_SUITE_CCMP:
1022 return ieee80211_crypto_ccmp_encrypt(
1023 tx, IEEE80211_CCMP_MIC_LEN);
1024 case WLAN_CIPHER_SUITE_CCMP_256:
1025 return ieee80211_crypto_ccmp_encrypt(
1026 tx, IEEE80211_CCMP_256_MIC_LEN);
1027 case WLAN_CIPHER_SUITE_AES_CMAC:
1028 return ieee80211_crypto_aes_cmac_encrypt(tx);
1029 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1030 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1031 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1032 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1033 return ieee80211_crypto_aes_gmac_encrypt(tx);
1034 case WLAN_CIPHER_SUITE_GCMP:
1035 case WLAN_CIPHER_SUITE_GCMP_256:
1036 return ieee80211_crypto_gcmp_encrypt(tx);
1038 return ieee80211_crypto_hw_encrypt(tx);
1044 static ieee80211_tx_result debug_noinline
1045 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1047 struct sk_buff *skb;
1048 struct ieee80211_hdr *hdr;
1052 skb_queue_walk(&tx->skbs, skb) {
1053 hdr = (void *) skb->data;
1054 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1055 break; /* must not overwrite AID */
1056 if (!skb_queue_is_last(&tx->skbs, skb)) {
1057 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1058 next_len = next->len;
1061 group_addr = is_multicast_ether_addr(hdr->addr1);
1064 ieee80211_duration(tx, skb, group_addr, next_len);
1070 /* actual transmit path */
1072 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1073 struct sk_buff *skb,
1074 struct ieee80211_tx_info *info,
1075 struct tid_ampdu_tx *tid_tx,
1078 bool queued = false;
1079 bool reset_agg_timer = false;
1080 struct sk_buff *purge_skb = NULL;
1082 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1083 info->flags |= IEEE80211_TX_CTL_AMPDU;
1084 reset_agg_timer = true;
1085 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1087 * nothing -- this aggregation session is being started
1088 * but that might still fail with the driver
1090 } else if (!tx->sta->sta.txq[tid]) {
1091 spin_lock(&tx->sta->lock);
1093 * Need to re-check now, because we may get here
1095 * 1) in the window during which the setup is actually
1096 * already done, but not marked yet because not all
1097 * packets are spliced over to the driver pending
1098 * queue yet -- if this happened we acquire the lock
1099 * either before or after the splice happens, but
1100 * need to recheck which of these cases happened.
1102 * 2) during session teardown, if the OPERATIONAL bit
1103 * was cleared due to the teardown but the pointer
1104 * hasn't been assigned NULL yet (or we loaded it
1105 * before it was assigned) -- in this case it may
1106 * now be NULL which means we should just let the
1107 * packet pass through because splicing the frames
1108 * back is already done.
1110 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1113 /* do nothing, let packet pass through */
1114 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1115 info->flags |= IEEE80211_TX_CTL_AMPDU;
1116 reset_agg_timer = true;
1119 info->control.vif = &tx->sdata->vif;
1120 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1121 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS |
1122 IEEE80211_TX_CTL_NO_PS_BUFFER |
1123 IEEE80211_TX_STATUS_EOSP;
1124 __skb_queue_tail(&tid_tx->pending, skb);
1125 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1126 purge_skb = __skb_dequeue(&tid_tx->pending);
1128 spin_unlock(&tx->sta->lock);
1131 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1134 /* reset session timer */
1135 if (reset_agg_timer && tid_tx->timeout)
1136 tid_tx->last_tx = jiffies;
1143 * pass %NULL for the station if unknown, a valid pointer if known
1144 * or an ERR_PTR() if the station is known not to exist
1146 static ieee80211_tx_result
1147 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1148 struct ieee80211_tx_data *tx,
1149 struct sta_info *sta, struct sk_buff *skb)
1151 struct ieee80211_local *local = sdata->local;
1152 struct ieee80211_hdr *hdr;
1153 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1157 memset(tx, 0, sizeof(*tx));
1161 __skb_queue_head_init(&tx->skbs);
1164 * If this flag is set to true anywhere, and we get here,
1165 * we are doing the needed processing, so remove the flag
1168 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1170 hdr = (struct ieee80211_hdr *) skb->data;
1176 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1177 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1178 if (!tx->sta && sdata->wdev.use_4addr)
1180 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1181 IEEE80211_TX_CTL_INJECTED) ||
1182 tx->sdata->control_port_protocol == tx->skb->protocol) {
1183 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1185 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1186 tx->sta = sta_info_get(sdata, hdr->addr1);
1189 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1190 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1191 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1192 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1193 struct tid_ampdu_tx *tid_tx;
1195 qc = ieee80211_get_qos_ctl(hdr);
1196 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1198 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1202 queued = ieee80211_tx_prep_agg(tx, skb, info,
1205 if (unlikely(queued))
1210 if (is_multicast_ether_addr(hdr->addr1)) {
1211 tx->flags &= ~IEEE80211_TX_UNICAST;
1212 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1214 tx->flags |= IEEE80211_TX_UNICAST;
1216 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1217 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1218 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1219 info->flags & IEEE80211_TX_CTL_AMPDU)
1220 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1224 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1225 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1226 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1227 ieee80211_check_fast_xmit(tx->sta);
1230 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1235 static void ieee80211_drv_tx(struct ieee80211_local *local,
1236 struct ieee80211_vif *vif,
1237 struct ieee80211_sta *pubsta,
1238 struct sk_buff *skb)
1240 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1241 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1242 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1243 struct ieee80211_tx_control control = {
1246 struct ieee80211_txq *txq = NULL;
1247 struct txq_info *txqi;
1250 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)
1253 if (!ieee80211_is_data(hdr->frame_control))
1257 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1259 txq = pubsta->txq[tid];
1268 txqi = to_txq_info(txq);
1269 atomic_inc(&sdata->txqs_len[ac]);
1270 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)
1271 netif_stop_subqueue(sdata->dev, ac);
1273 skb_queue_tail(&txqi->queue, skb);
1274 drv_wake_tx_queue(local, txqi);
1279 drv_tx(local, &control, skb);
1282 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
1283 struct ieee80211_txq *txq)
1285 struct ieee80211_local *local = hw_to_local(hw);
1286 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
1287 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
1288 struct ieee80211_hdr *hdr;
1289 struct sk_buff *skb = NULL;
1292 spin_lock_bh(&txqi->queue.lock);
1294 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
1297 skb = __skb_dequeue(&txqi->queue);
1301 atomic_dec(&sdata->txqs_len[ac]);
1302 if (__netif_subqueue_stopped(sdata->dev, ac))
1303 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);
1305 hdr = (struct ieee80211_hdr *)skb->data;
1306 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1307 struct sta_info *sta = container_of(txq->sta, struct sta_info,
1309 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1311 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
1312 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
1313 info->flags |= IEEE80211_TX_CTL_AMPDU;
1315 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1319 spin_unlock_bh(&txqi->queue.lock);
1323 EXPORT_SYMBOL(ieee80211_tx_dequeue);
1325 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1326 struct ieee80211_vif *vif,
1327 struct ieee80211_sta *sta,
1328 struct sk_buff_head *skbs,
1331 struct sk_buff *skb, *tmp;
1332 unsigned long flags;
1334 skb_queue_walk_safe(skbs, skb, tmp) {
1335 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1336 int q = info->hw_queue;
1338 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1339 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1340 __skb_unlink(skb, skbs);
1341 ieee80211_free_txskb(&local->hw, skb);
1346 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1347 if (local->queue_stop_reasons[q] ||
1348 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1349 if (unlikely(info->flags &
1350 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1351 if (local->queue_stop_reasons[q] &
1352 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1354 * Drop off-channel frames if queues
1355 * are stopped for any reason other
1356 * than off-channel operation. Never
1359 spin_unlock_irqrestore(
1360 &local->queue_stop_reason_lock,
1362 ieee80211_purge_tx_queue(&local->hw,
1369 * Since queue is stopped, queue up frames for
1370 * later transmission from the tx-pending
1371 * tasklet when the queue is woken again.
1374 skb_queue_splice_init(skbs,
1375 &local->pending[q]);
1377 skb_queue_splice_tail_init(skbs,
1378 &local->pending[q]);
1380 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1385 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1387 info->control.vif = vif;
1389 __skb_unlink(skb, skbs);
1390 ieee80211_drv_tx(local, vif, sta, skb);
1397 * Returns false if the frame couldn't be transmitted but was queued instead.
1399 static bool __ieee80211_tx(struct ieee80211_local *local,
1400 struct sk_buff_head *skbs, int led_len,
1401 struct sta_info *sta, bool txpending)
1403 struct ieee80211_tx_info *info;
1404 struct ieee80211_sub_if_data *sdata;
1405 struct ieee80211_vif *vif;
1406 struct ieee80211_sta *pubsta;
1407 struct sk_buff *skb;
1411 if (WARN_ON(skb_queue_empty(skbs)))
1414 skb = skb_peek(skbs);
1415 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1416 info = IEEE80211_SKB_CB(skb);
1417 sdata = vif_to_sdata(info->control.vif);
1418 if (sta && !sta->uploaded)
1426 switch (sdata->vif.type) {
1427 case NL80211_IFTYPE_MONITOR:
1428 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1432 sdata = rcu_dereference(local->monitor_sdata);
1436 vif->hw_queue[skb_get_queue_mapping(skb)];
1437 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1438 ieee80211_purge_tx_queue(&local->hw, skbs);
1443 case NL80211_IFTYPE_AP_VLAN:
1444 sdata = container_of(sdata->bss,
1445 struct ieee80211_sub_if_data, u.ap);
1452 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1455 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1457 WARN_ON_ONCE(!skb_queue_empty(skbs));
1463 * Invoke TX handlers, return 0 on success and non-zero if the
1464 * frame was dropped or queued.
1466 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1468 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1469 ieee80211_tx_result res = TX_DROP;
1471 #define CALL_TXH(txh) \
1474 if (res != TX_CONTINUE) \
1478 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1479 CALL_TXH(ieee80211_tx_h_check_assoc);
1480 CALL_TXH(ieee80211_tx_h_ps_buf);
1481 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1482 CALL_TXH(ieee80211_tx_h_select_key);
1483 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1484 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1486 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1487 __skb_queue_tail(&tx->skbs, tx->skb);
1492 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1493 CALL_TXH(ieee80211_tx_h_sequence);
1494 CALL_TXH(ieee80211_tx_h_fragment);
1495 /* handlers after fragment must be aware of tx info fragmentation! */
1496 CALL_TXH(ieee80211_tx_h_stats);
1497 CALL_TXH(ieee80211_tx_h_encrypt);
1498 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1499 CALL_TXH(ieee80211_tx_h_calculate_duration);
1503 if (unlikely(res == TX_DROP)) {
1504 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1506 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1508 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1510 } else if (unlikely(res == TX_QUEUED)) {
1511 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1518 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1519 struct ieee80211_vif *vif, struct sk_buff *skb,
1520 int band, struct ieee80211_sta **sta)
1522 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1523 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1524 struct ieee80211_tx_data tx;
1525 struct sk_buff *skb2;
1527 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1531 info->control.vif = vif;
1532 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1534 if (invoke_tx_handlers(&tx))
1539 *sta = &tx.sta->sta;
1544 /* this function isn't suitable for fragmented data frames */
1545 skb2 = __skb_dequeue(&tx.skbs);
1546 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1547 ieee80211_free_txskb(hw, skb2);
1548 ieee80211_purge_tx_queue(hw, &tx.skbs);
1554 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1557 * Returns false if the frame couldn't be transmitted but was queued instead.
1559 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1560 struct sta_info *sta, struct sk_buff *skb,
1563 struct ieee80211_local *local = sdata->local;
1564 struct ieee80211_tx_data tx;
1565 ieee80211_tx_result res_prepare;
1566 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1570 if (unlikely(skb->len < 10)) {
1575 /* initialises tx */
1577 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1579 if (unlikely(res_prepare == TX_DROP)) {
1580 ieee80211_free_txskb(&local->hw, skb);
1582 } else if (unlikely(res_prepare == TX_QUEUED)) {
1586 /* set up hw_queue value early */
1587 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1588 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1590 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1592 if (!invoke_tx_handlers(&tx))
1593 result = __ieee80211_tx(local, &tx.skbs, led_len,
1599 /* device xmit handlers */
1601 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1602 struct sk_buff *skb,
1603 int head_need, bool may_encrypt)
1605 struct ieee80211_local *local = sdata->local;
1608 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1609 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1610 tail_need -= skb_tailroom(skb);
1611 tail_need = max_t(int, tail_need, 0);
1614 if (skb_cloned(skb) &&
1615 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1616 !skb_clone_writable(skb, ETH_HLEN) ||
1617 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1618 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1619 else if (head_need || tail_need)
1620 I802_DEBUG_INC(local->tx_expand_skb_head);
1624 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1625 wiphy_debug(local->hw.wiphy,
1626 "failed to reallocate TX buffer\n");
1633 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1634 struct sta_info *sta, struct sk_buff *skb)
1636 struct ieee80211_local *local = sdata->local;
1637 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1638 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1642 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1644 headroom = local->tx_headroom;
1646 headroom += sdata->encrypt_headroom;
1647 headroom -= skb_headroom(skb);
1648 headroom = max_t(int, 0, headroom);
1650 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1651 ieee80211_free_txskb(&local->hw, skb);
1655 hdr = (struct ieee80211_hdr *) skb->data;
1656 info->control.vif = &sdata->vif;
1658 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1659 if (ieee80211_is_data(hdr->frame_control) &&
1660 is_unicast_ether_addr(hdr->addr1)) {
1661 if (mesh_nexthop_resolve(sdata, skb))
1662 return; /* skb queued: don't free */
1664 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1668 ieee80211_set_qos_hdr(sdata, skb);
1669 ieee80211_tx(sdata, sta, skb, false);
1672 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1673 struct sk_buff *skb)
1675 struct ieee80211_radiotap_iterator iterator;
1676 struct ieee80211_radiotap_header *rthdr =
1677 (struct ieee80211_radiotap_header *) skb->data;
1678 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1679 struct ieee80211_supported_band *sband =
1680 local->hw.wiphy->bands[info->band];
1681 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1685 bool rate_found = false;
1686 u8 rate_retries = 0;
1688 u8 mcs_known, mcs_flags;
1691 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1692 IEEE80211_TX_CTL_DONTFRAG;
1695 * for every radiotap entry that is present
1696 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1697 * entries present, or -EINVAL on error)
1701 ret = ieee80211_radiotap_iterator_next(&iterator);
1706 /* see if this argument is something we can use */
1707 switch (iterator.this_arg_index) {
1709 * You must take care when dereferencing iterator.this_arg
1710 * for multibyte types... the pointer is not aligned. Use
1711 * get_unaligned((type *)iterator.this_arg) to dereference
1712 * iterator.this_arg for type "type" safely on all arches.
1714 case IEEE80211_RADIOTAP_FLAGS:
1715 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1717 * this indicates that the skb we have been
1718 * handed has the 32-bit FCS CRC at the end...
1719 * we should react to that by snipping it off
1720 * because it will be recomputed and added
1723 if (skb->len < (iterator._max_length + FCS_LEN))
1726 skb_trim(skb, skb->len - FCS_LEN);
1728 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1729 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1730 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1731 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1734 case IEEE80211_RADIOTAP_TX_FLAGS:
1735 txflags = get_unaligned_le16(iterator.this_arg);
1736 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1737 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1740 case IEEE80211_RADIOTAP_RATE:
1741 rate = *iterator.this_arg;
1746 case IEEE80211_RADIOTAP_DATA_RETRIES:
1747 rate_retries = *iterator.this_arg;
1750 case IEEE80211_RADIOTAP_MCS:
1751 mcs_known = iterator.this_arg[0];
1752 mcs_flags = iterator.this_arg[1];
1753 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
1757 rate = iterator.this_arg[2];
1758 rate_flags = IEEE80211_TX_RC_MCS;
1760 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
1761 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
1762 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
1764 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
1765 mcs_flags & IEEE80211_RADIOTAP_MCS_BW_40)
1766 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1770 * Please update the file
1771 * Documentation/networking/mac80211-injection.txt
1772 * when parsing new fields here.
1780 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1784 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
1786 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
1787 info->control.rates[i].idx = -1;
1788 info->control.rates[i].flags = 0;
1789 info->control.rates[i].count = 0;
1792 if (rate_flags & IEEE80211_TX_RC_MCS) {
1793 info->control.rates[0].idx = rate;
1795 for (i = 0; i < sband->n_bitrates; i++) {
1796 if (rate * 5 != sband->bitrates[i].bitrate)
1799 info->control.rates[0].idx = i;
1804 info->control.rates[0].flags = rate_flags;
1805 info->control.rates[0].count = min_t(u8, rate_retries + 1,
1806 local->hw.max_rate_tries);
1810 * remove the radiotap header
1811 * iterator->_max_length was sanity-checked against
1812 * skb->len by iterator init
1814 skb_pull(skb, iterator._max_length);
1819 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1820 struct net_device *dev)
1822 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1823 struct ieee80211_chanctx_conf *chanctx_conf;
1824 struct ieee80211_radiotap_header *prthdr =
1825 (struct ieee80211_radiotap_header *)skb->data;
1826 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1827 struct ieee80211_hdr *hdr;
1828 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1829 struct cfg80211_chan_def *chandef;
1833 /* check for not even having the fixed radiotap header part */
1834 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1835 goto fail; /* too short to be possibly valid */
1837 /* is it a header version we can trust to find length from? */
1838 if (unlikely(prthdr->it_version))
1839 goto fail; /* only version 0 is supported */
1841 /* then there must be a radiotap header with a length we can use */
1842 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1844 /* does the skb contain enough to deliver on the alleged length? */
1845 if (unlikely(skb->len < len_rthdr))
1846 goto fail; /* skb too short for claimed rt header extent */
1849 * fix up the pointers accounting for the radiotap
1850 * header still being in there. We are being given
1851 * a precooked IEEE80211 header so no need for
1854 skb_set_mac_header(skb, len_rthdr);
1856 * these are just fixed to the end of the rt area since we
1857 * don't have any better information and at this point, nobody cares
1859 skb_set_network_header(skb, len_rthdr);
1860 skb_set_transport_header(skb, len_rthdr);
1862 if (skb->len < len_rthdr + 2)
1865 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1866 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1868 if (skb->len < len_rthdr + hdrlen)
1872 * Initialize skb->protocol if the injected frame is a data frame
1873 * carrying a rfc1042 header
1875 if (ieee80211_is_data(hdr->frame_control) &&
1876 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1877 u8 *payload = (u8 *)hdr + hdrlen;
1879 if (ether_addr_equal(payload, rfc1042_header))
1880 skb->protocol = cpu_to_be16((payload[6] << 8) |
1884 memset(info, 0, sizeof(*info));
1886 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1887 IEEE80211_TX_CTL_INJECTED;
1889 /* process and remove the injection radiotap header */
1890 if (!ieee80211_parse_tx_radiotap(local, skb))
1896 * We process outgoing injected frames that have a local address
1897 * we handle as though they are non-injected frames.
1898 * This code here isn't entirely correct, the local MAC address
1899 * isn't always enough to find the interface to use; for proper
1900 * VLAN/WDS support we will need a different mechanism (which
1901 * likely isn't going to be monitor interfaces).
1903 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1905 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1906 if (!ieee80211_sdata_running(tmp_sdata))
1908 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1909 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1910 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1912 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1918 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1919 if (!chanctx_conf) {
1920 tmp_sdata = rcu_dereference(local->monitor_sdata);
1923 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1927 chandef = &chanctx_conf->def;
1928 else if (!local->use_chanctx)
1929 chandef = &local->_oper_chandef;
1934 * Frame injection is not allowed if beaconing is not allowed
1935 * or if we need radar detection. Beaconing is usually not allowed when
1936 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1937 * Passive scan is also used in world regulatory domains where
1938 * your country is not known and as such it should be treated as
1939 * NO TX unless the channel is explicitly allowed in which case
1940 * your current regulatory domain would not have the passive scan
1943 * Since AP mode uses monitor interfaces to inject/TX management
1944 * frames we can make AP mode the exception to this rule once it
1945 * supports radar detection as its implementation can deal with
1946 * radar detection by itself. We can do that later by adding a
1947 * monitor flag interfaces used for AP support.
1949 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1953 info->band = chandef->chan->band;
1954 ieee80211_xmit(sdata, NULL, skb);
1957 return NETDEV_TX_OK;
1963 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1966 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
1968 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
1970 return ethertype == ETH_P_TDLS &&
1972 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1975 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
1976 struct sk_buff *skb,
1977 struct sta_info **sta_out)
1979 struct sta_info *sta;
1981 switch (sdata->vif.type) {
1982 case NL80211_IFTYPE_AP_VLAN:
1983 sta = rcu_dereference(sdata->u.vlan.sta);
1987 } else if (sdata->wdev.use_4addr) {
1991 case NL80211_IFTYPE_AP:
1992 case NL80211_IFTYPE_OCB:
1993 case NL80211_IFTYPE_ADHOC:
1994 if (is_multicast_ether_addr(skb->data)) {
1995 *sta_out = ERR_PTR(-ENOENT);
1998 sta = sta_info_get_bss(sdata, skb->data);
2000 case NL80211_IFTYPE_WDS:
2001 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2003 #ifdef CONFIG_MAC80211_MESH
2004 case NL80211_IFTYPE_MESH_POINT:
2005 /* determined much later */
2009 case NL80211_IFTYPE_STATION:
2010 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2011 sta = sta_info_get(sdata, skb->data);
2013 bool tdls_peer, tdls_auth;
2015 tdls_peer = test_sta_flag(sta,
2016 WLAN_STA_TDLS_PEER);
2017 tdls_auth = test_sta_flag(sta,
2018 WLAN_STA_TDLS_PEER_AUTH);
2020 if (tdls_peer && tdls_auth) {
2026 * TDLS link during setup - throw out frames to
2027 * peer. Allow TDLS-setup frames to unauthorized
2028 * peers for the special case of a link teardown
2029 * after a TDLS sta is removed due to being
2032 if (tdls_peer && !tdls_auth &&
2033 !ieee80211_is_tdls_setup(skb))
2039 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2047 *sta_out = sta ?: ERR_PTR(-ENOENT);
2052 * ieee80211_build_hdr - build 802.11 header in the given frame
2053 * @sdata: virtual interface to build the header for
2054 * @skb: the skb to build the header in
2055 * @info_flags: skb flags to set
2057 * This function takes the skb with 802.3 header and reformats the header to
2058 * the appropriate IEEE 802.11 header based on which interface the packet is
2059 * being transmitted on.
2061 * Note that this function also takes care of the TX status request and
2062 * potential unsharing of the SKB - this needs to be interleaved with the
2065 * The function requires the read-side RCU lock held
2067 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2069 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2070 struct sk_buff *skb, u32 info_flags,
2071 struct sta_info *sta)
2073 struct ieee80211_local *local = sdata->local;
2074 struct ieee80211_tx_info *info;
2076 u16 ethertype, hdrlen, meshhdrlen = 0;
2078 struct ieee80211_hdr hdr;
2079 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2080 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2081 const u8 *encaps_data;
2082 int encaps_len, skip_header_bytes;
2084 bool wme_sta = false, authorized = false;
2088 struct ieee80211_chanctx_conf *chanctx_conf;
2089 struct ieee80211_sub_if_data *ap_sdata;
2090 enum ieee80211_band band;
2096 /* convert Ethernet header to proper 802.11 header (based on
2097 * operation mode) */
2098 ethertype = (skb->data[12] << 8) | skb->data[13];
2099 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2101 switch (sdata->vif.type) {
2102 case NL80211_IFTYPE_AP_VLAN:
2103 if (sdata->wdev.use_4addr) {
2104 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2106 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2107 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2108 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2109 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2111 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2112 wme_sta = sta->sta.wme;
2114 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2116 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2117 if (!chanctx_conf) {
2121 band = chanctx_conf->def.chan->band;
2122 if (sdata->wdev.use_4addr)
2125 case NL80211_IFTYPE_AP:
2126 if (sdata->vif.type == NL80211_IFTYPE_AP)
2127 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2128 if (!chanctx_conf) {
2132 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2134 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2135 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2136 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2138 band = chanctx_conf->def.chan->band;
2140 case NL80211_IFTYPE_WDS:
2141 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2143 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2144 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2145 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2146 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2149 * This is the exception! WDS style interfaces are prohibited
2150 * when channel contexts are in used so this must be valid
2152 band = local->hw.conf.chandef.chan->band;
2154 #ifdef CONFIG_MAC80211_MESH
2155 case NL80211_IFTYPE_MESH_POINT:
2156 if (!is_multicast_ether_addr(skb->data)) {
2157 struct sta_info *next_hop;
2158 bool mpp_lookup = true;
2160 mpath = mesh_path_lookup(sdata, skb->data);
2163 next_hop = rcu_dereference(mpath->next_hop);
2165 !(mpath->flags & (MESH_PATH_ACTIVE |
2166 MESH_PATH_RESOLVING)))
2171 mppath = mpp_path_lookup(sdata, skb->data);
2173 if (mppath && mpath)
2174 mesh_path_del(mpath->sdata, mpath->dst);
2178 * Use address extension if it is a packet from
2179 * another interface or if we know the destination
2180 * is being proxied by a portal (i.e. portal address
2181 * differs from proxied address)
2183 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2184 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2185 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2186 skb->data, skb->data + ETH_ALEN);
2187 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2190 /* DS -> MBSS (802.11-2012 13.11.3.3).
2191 * For unicast with unknown forwarding information,
2192 * destination might be in the MBSS or if that fails
2193 * forwarded to another mesh gate. In either case
2194 * resolution will be handled in ieee80211_xmit(), so
2195 * leave the original DA. This also works for mcast */
2196 const u8 *mesh_da = skb->data;
2199 mesh_da = mppath->mpp;
2201 mesh_da = mpath->dst;
2203 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2204 mesh_da, sdata->vif.addr);
2205 if (is_multicast_ether_addr(mesh_da))
2206 /* DA TA mSA AE:SA */
2207 meshhdrlen = ieee80211_new_mesh_header(
2209 skb->data + ETH_ALEN, NULL);
2211 /* RA TA mDA mSA AE:DA SA */
2212 meshhdrlen = ieee80211_new_mesh_header(
2213 sdata, &mesh_hdr, skb->data,
2214 skb->data + ETH_ALEN);
2217 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2218 if (!chanctx_conf) {
2222 band = chanctx_conf->def.chan->band;
2225 case NL80211_IFTYPE_STATION:
2226 /* we already did checks when looking up the RA STA */
2227 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2231 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2232 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2233 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2235 } else if (sdata->u.mgd.use_4addr &&
2236 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2237 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2238 IEEE80211_FCTL_TODS);
2240 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2241 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2242 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2243 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2246 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2248 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2249 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2250 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2253 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2254 if (!chanctx_conf) {
2258 band = chanctx_conf->def.chan->band;
2260 case NL80211_IFTYPE_OCB:
2262 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2263 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2264 eth_broadcast_addr(hdr.addr3);
2266 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2267 if (!chanctx_conf) {
2271 band = chanctx_conf->def.chan->band;
2273 case NL80211_IFTYPE_ADHOC:
2275 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2276 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2277 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2279 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2280 if (!chanctx_conf) {
2284 band = chanctx_conf->def.chan->band;
2291 multicast = is_multicast_ether_addr(hdr.addr1);
2293 /* sta is always NULL for mesh */
2295 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2296 wme_sta = sta->sta.wme;
2297 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2298 /* For mesh, the use of the QoS header is mandatory */
2302 /* receiver does QoS (which also means we do) use it */
2304 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2309 * Drop unicast frames to unauthorised stations unless they are
2310 * EAPOL frames from the local station.
2312 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2313 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2314 !multicast && !authorized &&
2315 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2316 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2317 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2318 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2319 sdata->name, hdr.addr1);
2322 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2328 if (unlikely(!multicast && skb->sk &&
2329 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2330 struct sk_buff *ack_skb = skb_clone_sk(skb);
2333 unsigned long flags;
2336 spin_lock_irqsave(&local->ack_status_lock, flags);
2337 id = idr_alloc(&local->ack_status_frames, ack_skb,
2338 1, 0x10000, GFP_ATOMIC);
2339 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2343 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2351 * If the skb is shared we need to obtain our own copy.
2353 if (skb_shared(skb)) {
2354 struct sk_buff *tmp_skb = skb;
2356 /* can't happen -- skb is a clone if info_id != 0 */
2359 skb = skb_clone(skb, GFP_ATOMIC);
2368 hdr.frame_control = fc;
2369 hdr.duration_id = 0;
2372 skip_header_bytes = ETH_HLEN;
2373 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2374 encaps_data = bridge_tunnel_header;
2375 encaps_len = sizeof(bridge_tunnel_header);
2376 skip_header_bytes -= 2;
2377 } else if (ethertype >= ETH_P_802_3_MIN) {
2378 encaps_data = rfc1042_header;
2379 encaps_len = sizeof(rfc1042_header);
2380 skip_header_bytes -= 2;
2386 nh_pos = skb_network_header(skb) - skb->data;
2387 h_pos = skb_transport_header(skb) - skb->data;
2389 skb_pull(skb, skip_header_bytes);
2390 nh_pos -= skip_header_bytes;
2391 h_pos -= skip_header_bytes;
2393 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2396 * So we need to modify the skb header and hence need a copy of
2397 * that. The head_need variable above doesn't, so far, include
2398 * the needed header space that we don't need right away. If we
2399 * can, then we don't reallocate right now but only after the
2400 * frame arrives at the master device (if it does...)
2402 * If we cannot, however, then we will reallocate to include all
2403 * the ever needed space. Also, if we need to reallocate it anyway,
2404 * make it big enough for everything we may ever need.
2407 if (head_need > 0 || skb_cloned(skb)) {
2408 head_need += sdata->encrypt_headroom;
2409 head_need += local->tx_headroom;
2410 head_need = max_t(int, 0, head_need);
2411 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2412 ieee80211_free_txskb(&local->hw, skb);
2414 return ERR_PTR(-ENOMEM);
2419 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2420 nh_pos += encaps_len;
2421 h_pos += encaps_len;
2424 #ifdef CONFIG_MAC80211_MESH
2425 if (meshhdrlen > 0) {
2426 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2427 nh_pos += meshhdrlen;
2428 h_pos += meshhdrlen;
2432 if (ieee80211_is_data_qos(fc)) {
2433 __le16 *qos_control;
2435 qos_control = (__le16 *) skb_push(skb, 2);
2436 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2438 * Maybe we could actually set some fields here, for now just
2439 * initialise to zero to indicate no special operation.
2443 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2448 /* Update skb pointers to various headers since this modified frame
2449 * is going to go through Linux networking code that may potentially
2450 * need things like pointer to IP header. */
2451 skb_set_mac_header(skb, 0);
2452 skb_set_network_header(skb, nh_pos);
2453 skb_set_transport_header(skb, h_pos);
2455 info = IEEE80211_SKB_CB(skb);
2456 memset(info, 0, sizeof(*info));
2458 info->flags = info_flags;
2459 info->ack_frame_id = info_id;
2465 return ERR_PTR(ret);
2469 * fast-xmit overview
2471 * The core idea of this fast-xmit is to remove per-packet checks by checking
2472 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2473 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2474 * much less work can be done per packet. For example, fragmentation must be
2475 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2478 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2479 * header and other data to aid packet processing in ieee80211_xmit_fast().
2481 * The most difficult part of this is that when any of these assumptions
2482 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2483 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2484 * since the per-packet code no longer checks the conditions. This is reflected
2485 * by the calls to these functions throughout the rest of the code, and must be
2486 * maintained if any of the TX path checks change.
2489 void ieee80211_check_fast_xmit(struct sta_info *sta)
2491 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2492 struct ieee80211_local *local = sta->local;
2493 struct ieee80211_sub_if_data *sdata = sta->sdata;
2494 struct ieee80211_hdr *hdr = (void *)build.hdr;
2495 struct ieee80211_chanctx_conf *chanctx_conf;
2498 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2501 /* Locking here protects both the pointer itself, and against concurrent
2502 * invocations winning data access races to, e.g., the key pointer that
2504 * Without it, the invocation of this function right after the key
2505 * pointer changes wouldn't be sufficient, as another CPU could access
2506 * the pointer, then stall, and then do the cache update after the CPU
2507 * that invalidated the key.
2508 * With the locking, such scenarios cannot happen as the check for the
2509 * key and the fast-tx assignment are done atomically, so the CPU that
2510 * modifies the key will either wait or other one will see the key
2511 * cleared/changed already.
2513 spin_lock_bh(&sta->lock);
2514 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2515 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2516 sdata->vif.type == NL80211_IFTYPE_STATION)
2519 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2522 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2523 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2524 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2525 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2528 if (sdata->noack_map)
2531 /* fast-xmit doesn't handle fragmentation at all */
2532 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2533 !local->ops->set_frag_threshold)
2537 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2538 if (!chanctx_conf) {
2542 build.band = chanctx_conf->def.chan->band;
2545 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2547 switch (sdata->vif.type) {
2548 case NL80211_IFTYPE_ADHOC:
2550 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2551 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2552 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2555 case NL80211_IFTYPE_STATION:
2556 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2558 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2559 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2560 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2565 if (sdata->u.mgd.use_4addr) {
2566 /* non-regular ethertype cannot use the fastpath */
2567 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2568 IEEE80211_FCTL_TODS);
2570 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2571 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2572 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2573 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2577 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2579 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2580 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2581 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2584 case NL80211_IFTYPE_AP_VLAN:
2585 if (sdata->wdev.use_4addr) {
2586 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2587 IEEE80211_FCTL_TODS);
2589 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2590 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2591 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2592 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2597 case NL80211_IFTYPE_AP:
2598 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2600 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2601 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2602 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2606 /* not handled on fast-xmit */
2612 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2615 /* We store the key here so there's no point in using rcu_dereference()
2616 * but that's fine because the code that changes the pointers will call
2617 * this function after doing so. For a single CPU that would be enough,
2618 * for multiple see the comment above.
2620 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2622 build.key = rcu_access_pointer(sdata->default_unicast_key);
2624 bool gen_iv, iv_spc, mmic;
2626 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2627 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2628 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2630 /* don't handle software crypto */
2631 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2634 switch (build.key->conf.cipher) {
2635 case WLAN_CIPHER_SUITE_CCMP:
2636 case WLAN_CIPHER_SUITE_CCMP_256:
2637 /* add fixed key ID */
2639 (build.hdr + build.hdr_len)[3] =
2640 0x20 | (build.key->conf.keyidx << 6);
2641 build.pn_offs = build.hdr_len;
2643 if (gen_iv || iv_spc)
2644 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2646 case WLAN_CIPHER_SUITE_GCMP:
2647 case WLAN_CIPHER_SUITE_GCMP_256:
2648 /* add fixed key ID */
2650 (build.hdr + build.hdr_len)[3] =
2651 0x20 | (build.key->conf.keyidx << 6);
2652 build.pn_offs = build.hdr_len;
2654 if (gen_iv || iv_spc)
2655 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2657 case WLAN_CIPHER_SUITE_TKIP:
2658 /* cannot handle MMIC or IV generation in xmit-fast */
2662 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2664 case WLAN_CIPHER_SUITE_WEP40:
2665 case WLAN_CIPHER_SUITE_WEP104:
2666 /* cannot handle IV generation in fast-xmit */
2670 build.hdr_len += IEEE80211_WEP_IV_LEN;
2672 case WLAN_CIPHER_SUITE_AES_CMAC:
2673 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2674 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2675 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2677 "management cipher suite 0x%x enabled for data\n",
2678 build.key->conf.cipher);
2681 /* we don't know how to generate IVs for this at all */
2682 if (WARN_ON(gen_iv))
2684 /* pure hardware keys are OK, of course */
2685 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2687 /* cipher scheme might require space allocation */
2689 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2692 build.hdr_len += build.key->conf.iv_len;
2695 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2698 hdr->frame_control = fc;
2700 memcpy(build.hdr + build.hdr_len,
2701 rfc1042_header, sizeof(rfc1042_header));
2702 build.hdr_len += sizeof(rfc1042_header);
2704 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2705 /* if the kmemdup fails, continue w/o fast_tx */
2710 /* we might have raced against another call to this function */
2711 old = rcu_dereference_protected(sta->fast_tx,
2712 lockdep_is_held(&sta->lock));
2713 rcu_assign_pointer(sta->fast_tx, fast_tx);
2715 kfree_rcu(old, rcu_head);
2716 spin_unlock_bh(&sta->lock);
2719 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2721 struct sta_info *sta;
2724 list_for_each_entry_rcu(sta, &local->sta_list, list)
2725 ieee80211_check_fast_xmit(sta);
2729 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2731 struct ieee80211_local *local = sdata->local;
2732 struct sta_info *sta;
2736 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2737 if (sdata != sta->sdata &&
2738 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
2740 ieee80211_check_fast_xmit(sta);
2746 void ieee80211_clear_fast_xmit(struct sta_info *sta)
2748 struct ieee80211_fast_tx *fast_tx;
2750 spin_lock_bh(&sta->lock);
2751 fast_tx = rcu_dereference_protected(sta->fast_tx,
2752 lockdep_is_held(&sta->lock));
2753 RCU_INIT_POINTER(sta->fast_tx, NULL);
2754 spin_unlock_bh(&sta->lock);
2757 kfree_rcu(fast_tx, rcu_head);
2760 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
2761 struct net_device *dev, struct sta_info *sta,
2762 struct ieee80211_fast_tx *fast_tx,
2763 struct sk_buff *skb)
2765 struct ieee80211_local *local = sdata->local;
2766 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2767 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
2768 int hw_headroom = sdata->local->hw.extra_tx_headroom;
2770 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2771 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
2772 struct ieee80211_tx_data tx;
2773 ieee80211_tx_result r;
2774 struct tid_ampdu_tx *tid_tx = NULL;
2775 u8 tid = IEEE80211_NUM_TIDS;
2777 /* control port protocol needs a lot of special handling */
2778 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
2781 /* only RFC 1042 SNAP */
2782 if (ethertype < ETH_P_802_3_MIN)
2785 /* don't handle TX status request here either */
2786 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
2789 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2790 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2791 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
2793 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2795 if (tid_tx->timeout)
2796 tid_tx->last_tx = jiffies;
2800 /* after this point (skb is modified) we cannot return false */
2802 if (skb_shared(skb)) {
2803 struct sk_buff *tmp_skb = skb;
2805 skb = skb_clone(skb, GFP_ATOMIC);
2812 ieee80211_tx_stats(dev, skb->len + extra_head);
2814 /* will not be crypto-handled beyond what we do here, so use false
2815 * as the may-encrypt argument for the resize to not account for
2816 * more room than we already have in 'extra_head'
2818 if (unlikely(ieee80211_skb_resize(sdata, skb,
2819 max_t(int, extra_head + hw_headroom -
2820 skb_headroom(skb), 0),
2826 memcpy(ð, skb->data, ETH_HLEN - 2);
2827 hdr = (void *)skb_push(skb, extra_head);
2828 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
2829 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
2830 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
2832 memset(info, 0, sizeof(*info));
2833 info->band = fast_tx->band;
2834 info->control.vif = &sdata->vif;
2835 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
2836 IEEE80211_TX_CTL_DONTFRAG |
2837 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
2839 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2840 *ieee80211_get_qos_ctl(hdr) = tid;
2841 if (!sta->sta.txq[0])
2842 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
2844 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2845 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
2846 sdata->sequence_number += 0x10;
2849 if (skb_shinfo(skb)->gso_size)
2850 sta->tx_stats.msdu[tid] +=
2851 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
2853 sta->tx_stats.msdu[tid]++;
2855 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
2857 __skb_queue_head_init(&tx.skbs);
2859 tx.flags = IEEE80211_TX_UNICAST;
2863 tx.key = fast_tx->key;
2866 info->control.hw_key = &fast_tx->key->conf;
2868 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
2870 r = ieee80211_tx_h_rate_ctrl(&tx);
2874 if (r != TX_CONTINUE) {
2881 /* statistics normally done by ieee80211_tx_h_stats (but that
2882 * has to consider fragmentation, so is more complex)
2884 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
2885 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
2887 if (fast_tx->pn_offs) {
2889 u8 *crypto_hdr = skb->data + fast_tx->pn_offs;
2891 switch (fast_tx->key->conf.cipher) {
2892 case WLAN_CIPHER_SUITE_CCMP:
2893 case WLAN_CIPHER_SUITE_CCMP_256:
2894 case WLAN_CIPHER_SUITE_GCMP:
2895 case WLAN_CIPHER_SUITE_GCMP_256:
2896 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
2898 crypto_hdr[1] = pn >> 8;
2899 crypto_hdr[4] = pn >> 16;
2900 crypto_hdr[5] = pn >> 24;
2901 crypto_hdr[6] = pn >> 32;
2902 crypto_hdr[7] = pn >> 40;
2907 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2908 sdata = container_of(sdata->bss,
2909 struct ieee80211_sub_if_data, u.ap);
2911 __skb_queue_tail(&tx.skbs, skb);
2912 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
2916 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2917 struct net_device *dev,
2920 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2921 struct sta_info *sta;
2922 struct sk_buff *next;
2924 if (unlikely(skb->len < ETH_HLEN)) {
2931 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
2934 if (!IS_ERR_OR_NULL(sta)) {
2935 struct ieee80211_fast_tx *fast_tx;
2937 fast_tx = rcu_dereference(sta->fast_tx);
2940 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
2944 if (skb_is_gso(skb)) {
2945 struct sk_buff *segs;
2947 segs = skb_gso_segment(skb, 0);
2955 /* we cannot process non-linear frames on this path */
2956 if (skb_linearize(skb)) {
2961 /* the frame could be fragmented, software-encrypted, and other
2962 * things so we cannot really handle checksum offload with it -
2963 * fix it up in software before we handle anything else.
2965 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2966 skb_set_transport_header(skb,
2967 skb_checksum_start_offset(skb));
2968 if (skb_checksum_help(skb))
2981 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2985 ieee80211_tx_stats(dev, skb->len);
2987 ieee80211_xmit(sdata, sta, skb);
2997 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2998 * @skb: packet to be sent
2999 * @dev: incoming interface
3001 * On failure skb will be freed.
3003 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3004 struct net_device *dev)
3006 __ieee80211_subif_start_xmit(skb, dev, 0);
3007 return NETDEV_TX_OK;
3011 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3012 struct sk_buff *skb, u32 info_flags)
3014 struct ieee80211_hdr *hdr;
3015 struct ieee80211_tx_data tx = {
3016 .local = sdata->local,
3019 struct sta_info *sta;
3023 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3025 skb = ERR_PTR(-EINVAL);
3029 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3033 hdr = (void *)skb->data;
3034 tx.sta = sta_info_get(sdata, hdr->addr1);
3037 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3040 return ERR_PTR(-EINVAL);
3049 * ieee80211_clear_tx_pending may not be called in a context where
3050 * it is possible that it packets could come in again.
3052 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3054 struct sk_buff *skb;
3057 for (i = 0; i < local->hw.queues; i++) {
3058 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3059 ieee80211_free_txskb(&local->hw, skb);
3064 * Returns false if the frame couldn't be transmitted but was queued instead,
3065 * which in this case means re-queued -- take as an indication to stop sending
3066 * more pending frames.
3068 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3069 struct sk_buff *skb)
3071 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3072 struct ieee80211_sub_if_data *sdata;
3073 struct sta_info *sta;
3074 struct ieee80211_hdr *hdr;
3076 struct ieee80211_chanctx_conf *chanctx_conf;
3078 sdata = vif_to_sdata(info->control.vif);
3080 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3081 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3082 if (unlikely(!chanctx_conf)) {
3086 info->band = chanctx_conf->def.chan->band;
3087 result = ieee80211_tx(sdata, NULL, skb, true);
3089 struct sk_buff_head skbs;
3091 __skb_queue_head_init(&skbs);
3092 __skb_queue_tail(&skbs, skb);
3094 hdr = (struct ieee80211_hdr *)skb->data;
3095 sta = sta_info_get(sdata, hdr->addr1);
3097 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3104 * Transmit all pending packets. Called from tasklet.
3106 void ieee80211_tx_pending(unsigned long data)
3108 struct ieee80211_local *local = (struct ieee80211_local *)data;
3109 unsigned long flags;
3115 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3116 for (i = 0; i < local->hw.queues; i++) {
3118 * If queue is stopped by something other than due to pending
3119 * frames, or we have no pending frames, proceed to next queue.
3121 if (local->queue_stop_reasons[i] ||
3122 skb_queue_empty(&local->pending[i]))
3125 while (!skb_queue_empty(&local->pending[i])) {
3126 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3127 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3129 if (WARN_ON(!info->control.vif)) {
3130 ieee80211_free_txskb(&local->hw, skb);
3134 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3137 txok = ieee80211_tx_pending_skb(local, skb);
3138 spin_lock_irqsave(&local->queue_stop_reason_lock,
3144 if (skb_queue_empty(&local->pending[i]))
3145 ieee80211_propagate_queue_wake(local, i);
3147 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3152 /* functions for drivers to get certain frames */
3154 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3155 struct ps_data *ps, struct sk_buff *skb,
3160 int i, have_bits = 0, n1, n2;
3162 /* Generate bitmap for TIM only if there are any STAs in power save
3164 if (atomic_read(&ps->num_sta_ps) > 0)
3165 /* in the hope that this is faster than
3166 * checking byte-for-byte */
3167 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3168 IEEE80211_MAX_AID+1);
3170 if (ps->dtim_count == 0)
3171 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3176 tim = pos = (u8 *) skb_put(skb, 6);
3177 *pos++ = WLAN_EID_TIM;
3179 *pos++ = ps->dtim_count;
3180 *pos++ = sdata->vif.bss_conf.dtim_period;
3182 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3185 ps->dtim_bc_mc = aid0 == 1;
3188 /* Find largest even number N1 so that bits numbered 1 through
3189 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3190 * (N2 + 1) x 8 through 2007 are 0. */
3192 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3199 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3206 /* Bitmap control */
3208 /* Part Virt Bitmap */
3209 skb_put(skb, n2 - n1);
3210 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3212 tim[1] = n2 - n1 + 4;
3214 *pos++ = aid0; /* Bitmap control */
3215 *pos++ = 0; /* Part Virt Bitmap */
3219 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3220 struct ps_data *ps, struct sk_buff *skb,
3223 struct ieee80211_local *local = sdata->local;
3226 * Not very nice, but we want to allow the driver to call
3227 * ieee80211_beacon_get() as a response to the set_tim()
3228 * callback. That, however, is already invoked under the
3229 * sta_lock to guarantee consistent and race-free update
3230 * of the tim bitmap in mac80211 and the driver.
3232 if (local->tim_in_locked_section) {
3233 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3235 spin_lock_bh(&local->tim_lock);
3236 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3237 spin_unlock_bh(&local->tim_lock);
3243 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3244 struct beacon_data *beacon)
3246 struct probe_resp *resp;
3248 size_t beacon_data_len;
3250 u8 count = beacon->csa_current_counter;
3252 switch (sdata->vif.type) {
3253 case NL80211_IFTYPE_AP:
3254 beacon_data = beacon->tail;
3255 beacon_data_len = beacon->tail_len;
3257 case NL80211_IFTYPE_ADHOC:
3258 beacon_data = beacon->head;
3259 beacon_data_len = beacon->head_len;
3261 case NL80211_IFTYPE_MESH_POINT:
3262 beacon_data = beacon->head;
3263 beacon_data_len = beacon->head_len;
3270 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3271 resp = rcu_dereference(sdata->u.ap.probe_resp);
3273 if (beacon->csa_counter_offsets[i]) {
3274 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3280 beacon_data[beacon->csa_counter_offsets[i]] = count;
3283 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3284 resp->data[resp->csa_counter_offsets[i]] = count;
3289 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3291 beacon->csa_current_counter--;
3293 /* the counter should never reach 0 */
3294 WARN_ON_ONCE(!beacon->csa_current_counter);
3296 return beacon->csa_current_counter;
3299 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3301 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3302 struct beacon_data *beacon = NULL;
3307 if (sdata->vif.type == NL80211_IFTYPE_AP)
3308 beacon = rcu_dereference(sdata->u.ap.beacon);
3309 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3310 beacon = rcu_dereference(sdata->u.ibss.presp);
3311 else if (ieee80211_vif_is_mesh(&sdata->vif))
3312 beacon = rcu_dereference(sdata->u.mesh.beacon);
3317 count = __ieee80211_csa_update_counter(beacon);
3323 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3325 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3327 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3328 struct beacon_data *beacon = NULL;
3330 size_t beacon_data_len;
3333 if (!ieee80211_sdata_running(sdata))
3337 if (vif->type == NL80211_IFTYPE_AP) {
3338 struct ieee80211_if_ap *ap = &sdata->u.ap;
3340 beacon = rcu_dereference(ap->beacon);
3341 if (WARN_ON(!beacon || !beacon->tail))
3343 beacon_data = beacon->tail;
3344 beacon_data_len = beacon->tail_len;
3345 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3346 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3348 beacon = rcu_dereference(ifibss->presp);
3352 beacon_data = beacon->head;
3353 beacon_data_len = beacon->head_len;
3354 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3355 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3357 beacon = rcu_dereference(ifmsh->beacon);
3361 beacon_data = beacon->head;
3362 beacon_data_len = beacon->head_len;
3368 if (!beacon->csa_counter_offsets[0])
3371 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3374 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3381 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3383 static struct sk_buff *
3384 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3385 struct ieee80211_vif *vif,
3386 struct ieee80211_mutable_offsets *offs,
3389 struct ieee80211_local *local = hw_to_local(hw);
3390 struct beacon_data *beacon = NULL;
3391 struct sk_buff *skb = NULL;
3392 struct ieee80211_tx_info *info;
3393 struct ieee80211_sub_if_data *sdata = NULL;
3394 enum ieee80211_band band;
3395 struct ieee80211_tx_rate_control txrc;
3396 struct ieee80211_chanctx_conf *chanctx_conf;
3397 int csa_off_base = 0;
3401 sdata = vif_to_sdata(vif);
3402 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3404 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3408 memset(offs, 0, sizeof(*offs));
3410 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3411 struct ieee80211_if_ap *ap = &sdata->u.ap;
3413 beacon = rcu_dereference(ap->beacon);
3415 if (beacon->csa_counter_offsets[0]) {
3417 __ieee80211_csa_update_counter(beacon);
3419 ieee80211_set_csa(sdata, beacon);
3423 * headroom, head length,
3424 * tail length and maximum TIM length
3426 skb = dev_alloc_skb(local->tx_headroom +
3428 beacon->tail_len + 256 +
3429 local->hw.extra_beacon_tailroom);
3433 skb_reserve(skb, local->tx_headroom);
3434 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3437 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3441 offs->tim_offset = beacon->head_len;
3442 offs->tim_length = skb->len - beacon->head_len;
3444 /* for AP the csa offsets are from tail */
3445 csa_off_base = skb->len;
3449 memcpy(skb_put(skb, beacon->tail_len),
3450 beacon->tail, beacon->tail_len);
3453 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
3454 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3455 struct ieee80211_hdr *hdr;
3457 beacon = rcu_dereference(ifibss->presp);
3461 if (beacon->csa_counter_offsets[0]) {
3463 __ieee80211_csa_update_counter(beacon);
3465 ieee80211_set_csa(sdata, beacon);
3468 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
3469 local->hw.extra_beacon_tailroom);
3472 skb_reserve(skb, local->tx_headroom);
3473 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3476 hdr = (struct ieee80211_hdr *) skb->data;
3477 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3478 IEEE80211_STYPE_BEACON);
3479 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3480 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3482 beacon = rcu_dereference(ifmsh->beacon);
3486 if (beacon->csa_counter_offsets[0]) {
3488 /* TODO: For mesh csa_counter is in TU, so
3489 * decrementing it by one isn't correct, but
3490 * for now we leave it consistent with overall
3491 * mac80211's behavior.
3493 __ieee80211_csa_update_counter(beacon);
3495 ieee80211_set_csa(sdata, beacon);
3498 if (ifmsh->sync_ops)
3499 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
3501 skb = dev_alloc_skb(local->tx_headroom +
3505 local->hw.extra_beacon_tailroom);
3508 skb_reserve(skb, local->tx_headroom);
3509 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3511 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
3514 offs->tim_offset = beacon->head_len;
3515 offs->tim_length = skb->len - beacon->head_len;
3518 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
3526 if (offs && beacon) {
3529 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
3530 u16 csa_off = beacon->csa_counter_offsets[i];
3535 offs->csa_counter_offs[i] = csa_off_base + csa_off;
3539 band = chanctx_conf->def.chan->band;
3541 info = IEEE80211_SKB_CB(skb);
3543 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
3544 info->flags |= IEEE80211_TX_CTL_NO_ACK;
3547 memset(&txrc, 0, sizeof(txrc));
3549 txrc.sband = local->hw.wiphy->bands[band];
3550 txrc.bss_conf = &sdata->vif.bss_conf;
3552 txrc.reported_rate.idx = -1;
3553 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
3554 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
3555 txrc.max_rate_idx = -1;
3557 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
3559 rate_control_get_rate(sdata, NULL, &txrc);
3561 info->control.vif = vif;
3563 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
3564 IEEE80211_TX_CTL_ASSIGN_SEQ |
3565 IEEE80211_TX_CTL_FIRST_FRAGMENT;
3573 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
3574 struct ieee80211_vif *vif,
3575 struct ieee80211_mutable_offsets *offs)
3577 return __ieee80211_beacon_get(hw, vif, offs, true);
3579 EXPORT_SYMBOL(ieee80211_beacon_get_template);
3581 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
3582 struct ieee80211_vif *vif,
3583 u16 *tim_offset, u16 *tim_length)
3585 struct ieee80211_mutable_offsets offs = {};
3586 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
3587 struct sk_buff *copy;
3588 struct ieee80211_supported_band *sband;
3595 *tim_offset = offs.tim_offset;
3598 *tim_length = offs.tim_length;
3600 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
3601 !hw_to_local(hw)->monitors)
3604 /* send a copy to monitor interfaces */
3605 copy = skb_copy(bcn, GFP_ATOMIC);
3609 shift = ieee80211_vif_get_shift(vif);
3610 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
3611 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
3615 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
3617 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
3618 struct ieee80211_vif *vif)
3620 struct ieee80211_if_ap *ap = NULL;
3621 struct sk_buff *skb = NULL;
3622 struct probe_resp *presp = NULL;
3623 struct ieee80211_hdr *hdr;
3624 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3626 if (sdata->vif.type != NL80211_IFTYPE_AP)
3632 presp = rcu_dereference(ap->probe_resp);
3636 skb = dev_alloc_skb(presp->len);
3640 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
3642 hdr = (struct ieee80211_hdr *) skb->data;
3643 memset(hdr->addr1, 0, sizeof(hdr->addr1));
3649 EXPORT_SYMBOL(ieee80211_proberesp_get);
3651 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
3652 struct ieee80211_vif *vif)
3654 struct ieee80211_sub_if_data *sdata;
3655 struct ieee80211_if_managed *ifmgd;
3656 struct ieee80211_pspoll *pspoll;
3657 struct ieee80211_local *local;
3658 struct sk_buff *skb;
3660 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3663 sdata = vif_to_sdata(vif);
3664 ifmgd = &sdata->u.mgd;
3665 local = sdata->local;
3667 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
3671 skb_reserve(skb, local->hw.extra_tx_headroom);
3673 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
3674 memset(pspoll, 0, sizeof(*pspoll));
3675 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
3676 IEEE80211_STYPE_PSPOLL);
3677 pspoll->aid = cpu_to_le16(ifmgd->aid);
3679 /* aid in PS-Poll has its two MSBs each set to 1 */
3680 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
3682 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
3683 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
3687 EXPORT_SYMBOL(ieee80211_pspoll_get);
3689 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
3690 struct ieee80211_vif *vif)
3692 struct ieee80211_hdr_3addr *nullfunc;
3693 struct ieee80211_sub_if_data *sdata;
3694 struct ieee80211_if_managed *ifmgd;
3695 struct ieee80211_local *local;
3696 struct sk_buff *skb;
3698 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3701 sdata = vif_to_sdata(vif);
3702 ifmgd = &sdata->u.mgd;
3703 local = sdata->local;
3705 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
3709 skb_reserve(skb, local->hw.extra_tx_headroom);
3711 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
3713 memset(nullfunc, 0, sizeof(*nullfunc));
3714 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
3715 IEEE80211_STYPE_NULLFUNC |
3716 IEEE80211_FCTL_TODS);
3717 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
3718 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
3719 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
3723 EXPORT_SYMBOL(ieee80211_nullfunc_get);
3725 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
3727 const u8 *ssid, size_t ssid_len,
3730 struct ieee80211_local *local = hw_to_local(hw);
3731 struct ieee80211_hdr_3addr *hdr;
3732 struct sk_buff *skb;
3736 ie_ssid_len = 2 + ssid_len;
3738 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
3739 ie_ssid_len + tailroom);
3743 skb_reserve(skb, local->hw.extra_tx_headroom);
3745 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3746 memset(hdr, 0, sizeof(*hdr));
3747 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3748 IEEE80211_STYPE_PROBE_REQ);
3749 eth_broadcast_addr(hdr->addr1);
3750 memcpy(hdr->addr2, src_addr, ETH_ALEN);
3751 eth_broadcast_addr(hdr->addr3);
3753 pos = skb_put(skb, ie_ssid_len);
3754 *pos++ = WLAN_EID_SSID;
3757 memcpy(pos, ssid, ssid_len);
3762 EXPORT_SYMBOL(ieee80211_probereq_get);
3764 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3765 const void *frame, size_t frame_len,
3766 const struct ieee80211_tx_info *frame_txctl,
3767 struct ieee80211_rts *rts)
3769 const struct ieee80211_hdr *hdr = frame;
3771 rts->frame_control =
3772 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3773 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3775 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3776 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3778 EXPORT_SYMBOL(ieee80211_rts_get);
3780 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3781 const void *frame, size_t frame_len,
3782 const struct ieee80211_tx_info *frame_txctl,
3783 struct ieee80211_cts *cts)
3785 const struct ieee80211_hdr *hdr = frame;
3787 cts->frame_control =
3788 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3789 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3790 frame_len, frame_txctl);
3791 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3793 EXPORT_SYMBOL(ieee80211_ctstoself_get);
3796 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3797 struct ieee80211_vif *vif)
3799 struct ieee80211_local *local = hw_to_local(hw);
3800 struct sk_buff *skb = NULL;
3801 struct ieee80211_tx_data tx;
3802 struct ieee80211_sub_if_data *sdata;
3804 struct ieee80211_tx_info *info;
3805 struct ieee80211_chanctx_conf *chanctx_conf;
3807 sdata = vif_to_sdata(vif);
3810 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3815 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3816 struct beacon_data *beacon =
3817 rcu_dereference(sdata->u.ap.beacon);
3819 if (!beacon || !beacon->head)
3822 ps = &sdata->u.ap.ps;
3823 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3824 ps = &sdata->u.mesh.ps;
3829 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3830 goto out; /* send buffered bc/mc only after DTIM beacon */
3833 skb = skb_dequeue(&ps->bc_buf);
3836 local->total_ps_buffered--;
3838 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3839 struct ieee80211_hdr *hdr =
3840 (struct ieee80211_hdr *) skb->data;
3841 /* more buffered multicast/broadcast frames ==> set
3842 * MoreData flag in IEEE 802.11 header to inform PS
3844 hdr->frame_control |=
3845 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3848 if (sdata->vif.type == NL80211_IFTYPE_AP)
3849 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3850 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
3852 dev_kfree_skb_any(skb);
3855 info = IEEE80211_SKB_CB(skb);
3857 tx.flags |= IEEE80211_TX_PS_BUFFERED;
3858 info->band = chanctx_conf->def.chan->band;
3860 if (invoke_tx_handlers(&tx))
3867 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3869 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3871 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3872 struct ieee80211_sub_if_data *sdata = sta->sdata;
3873 struct ieee80211_local *local = sdata->local;
3877 lockdep_assert_held(&local->sta_mtx);
3879 /* only some cases are supported right now */
3880 switch (sdata->vif.type) {
3881 case NL80211_IFTYPE_STATION:
3882 case NL80211_IFTYPE_AP:
3883 case NL80211_IFTYPE_AP_VLAN:
3890 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3893 if (sta->reserved_tid == tid) {
3898 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3899 sdata_err(sdata, "TID reservation already active\n");
3904 ieee80211_stop_vif_queues(sdata->local, sdata,
3905 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3909 /* Tear down BA sessions so we stop aggregating on this TID */
3910 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
3911 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3912 __ieee80211_stop_tx_ba_session(sta, tid,
3913 AGG_STOP_LOCAL_REQUEST);
3916 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3917 __ieee80211_flush_queues(local, sdata, queues, false);
3919 sta->reserved_tid = tid;
3921 ieee80211_wake_vif_queues(local, sdata,
3922 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3924 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
3925 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3931 EXPORT_SYMBOL(ieee80211_reserve_tid);
3933 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3935 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3936 struct ieee80211_sub_if_data *sdata = sta->sdata;
3938 lockdep_assert_held(&sdata->local->sta_mtx);
3940 /* only some cases are supported right now */
3941 switch (sdata->vif.type) {
3942 case NL80211_IFTYPE_STATION:
3943 case NL80211_IFTYPE_AP:
3944 case NL80211_IFTYPE_AP_VLAN:
3951 if (tid != sta->reserved_tid) {
3952 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3956 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3958 EXPORT_SYMBOL(ieee80211_unreserve_tid);
3960 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3961 struct sk_buff *skb, int tid,
3962 enum ieee80211_band band)
3964 int ac = ieee802_1d_to_ac[tid & 7];
3966 skb_set_mac_header(skb, 0);
3967 skb_set_network_header(skb, 0);
3968 skb_set_transport_header(skb, 0);
3970 skb_set_queue_mapping(skb, ac);
3971 skb->priority = tid;
3973 skb->dev = sdata->dev;
3976 * The other path calling ieee80211_xmit is from the tasklet,
3977 * and while we can handle concurrent transmissions locking
3978 * requirements are that we do not come into tx with bhs on.
3981 IEEE80211_SKB_CB(skb)->band = band;
3982 ieee80211_xmit(sdata, NULL, skb);