1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Copyright (C) 2018-2020 Intel Corporation
10 * Transmit and frame generation functions.
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/skbuff.h>
16 #include <linux/if_vlan.h>
17 #include <linux/etherdevice.h>
18 #include <linux/bitmap.h>
19 #include <linux/rcupdate.h>
20 #include <linux/export.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <net/codel.h>
26 #include <net/codel_impl.h>
27 #include <asm/unaligned.h>
28 #include <net/fq_impl.h>
30 #include "ieee80211_i.h"
31 #include "driver-ops.h"
41 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
43 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
45 u64_stats_update_begin(&tstats->syncp);
47 tstats->tx_bytes += len;
48 u64_stats_update_end(&tstats->syncp);
51 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
52 struct sk_buff *skb, int group_addr,
55 int rate, mrate, erp, dur, i, shift = 0;
56 struct ieee80211_rate *txrate;
57 struct ieee80211_local *local = tx->local;
58 struct ieee80211_supported_band *sband;
59 struct ieee80211_hdr *hdr;
60 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
61 struct ieee80211_chanctx_conf *chanctx_conf;
64 /* assume HW handles this */
65 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
69 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
71 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
72 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
77 if (WARN_ON_ONCE(tx->rate.idx < 0))
80 sband = local->hw.wiphy->bands[info->band];
81 txrate = &sband->bitrates[tx->rate.idx];
83 erp = txrate->flags & IEEE80211_RATE_ERP_G;
86 * data and mgmt (except PS Poll):
88 * - during contention period:
89 * if addr1 is group address: 0
90 * if more fragments = 0 and addr1 is individual address: time to
91 * transmit one ACK plus SIFS
92 * if more fragments = 1 and addr1 is individual address: time to
93 * transmit next fragment plus 2 x ACK plus 3 x SIFS
96 * - control response frame (CTS or ACK) shall be transmitted using the
97 * same rate as the immediately previous frame in the frame exchange
98 * sequence, if this rate belongs to the PHY mandatory rates, or else
99 * at the highest possible rate belonging to the PHY rates in the
102 hdr = (struct ieee80211_hdr *)skb->data;
103 if (ieee80211_is_ctl(hdr->frame_control)) {
104 /* TODO: These control frames are not currently sent by
105 * mac80211, but should they be implemented, this function
106 * needs to be updated to support duration field calculation.
108 * RTS: time needed to transmit pending data/mgmt frame plus
109 * one CTS frame plus one ACK frame plus 3 x SIFS
110 * CTS: duration of immediately previous RTS minus time
111 * required to transmit CTS and its SIFS
112 * ACK: 0 if immediately previous directed data/mgmt had
113 * more=0, with more=1 duration in ACK frame is duration
114 * from previous frame minus time needed to transmit ACK
116 * PS Poll: BIT(15) | BIT(14) | aid
122 if (0 /* FIX: data/mgmt during CFP */)
123 return cpu_to_le16(32768);
125 if (group_addr) /* Group address as the destination - no ACK */
128 /* Individual destination address:
129 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
130 * CTS and ACK frames shall be transmitted using the highest rate in
131 * basic rate set that is less than or equal to the rate of the
132 * immediately previous frame and that is using the same modulation
133 * (CCK or OFDM). If no basic rate set matches with these requirements,
134 * the highest mandatory rate of the PHY that is less than or equal to
135 * the rate of the previous frame is used.
136 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
139 /* use lowest available if everything fails */
140 mrate = sband->bitrates[0].bitrate;
141 for (i = 0; i < sband->n_bitrates; i++) {
142 struct ieee80211_rate *r = &sband->bitrates[i];
144 if (r->bitrate > txrate->bitrate)
147 if ((rate_flags & r->flags) != rate_flags)
150 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
151 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
153 switch (sband->band) {
154 case NL80211_BAND_2GHZ: {
156 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
157 flag = IEEE80211_RATE_MANDATORY_G;
159 flag = IEEE80211_RATE_MANDATORY_B;
164 case NL80211_BAND_5GHZ:
165 case NL80211_BAND_6GHZ:
166 if (r->flags & IEEE80211_RATE_MANDATORY_A)
169 case NL80211_BAND_60GHZ:
170 /* TODO, for now fall through */
171 case NUM_NL80211_BANDS:
177 /* No matching basic rate found; use highest suitable mandatory
179 rate = DIV_ROUND_UP(mrate, 1 << shift);
182 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
183 if (ieee80211_is_data_qos(hdr->frame_control) &&
184 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
187 /* Time needed to transmit ACK
188 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
189 * to closest integer */
190 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
191 tx->sdata->vif.bss_conf.use_short_preamble,
195 /* Frame is fragmented: duration increases with time needed to
196 * transmit next fragment plus ACK and 2 x SIFS. */
197 dur *= 2; /* ACK + SIFS */
199 dur += ieee80211_frame_duration(sband->band, next_frag_len,
200 txrate->bitrate, erp,
201 tx->sdata->vif.bss_conf.use_short_preamble,
205 return cpu_to_le16(dur);
209 static ieee80211_tx_result debug_noinline
210 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
212 struct ieee80211_local *local = tx->local;
213 struct ieee80211_if_managed *ifmgd;
214 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
216 /* driver doesn't support power save */
217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
220 /* hardware does dynamic power save */
221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
224 /* dynamic power save disabled */
225 if (local->hw.conf.dynamic_ps_timeout <= 0)
228 /* we are scanning, don't enable power save */
232 if (!local->ps_sdata)
235 /* No point if we're going to suspend */
236 if (local->quiescing)
239 /* dynamic ps is supported only in managed mode */
240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
243 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK))
246 ifmgd = &tx->sdata->u.mgd;
249 * Don't wakeup from power save if u-apsd is enabled, voip ac has
250 * u-apsd enabled and the frame is in voip class. This effectively
251 * means that even if all access categories have u-apsd enabled, in
252 * practise u-apsd is only used with the voip ac. This is a
253 * workaround for the case when received voip class packets do not
254 * have correct qos tag for some reason, due the network or the
257 * Note: ifmgd->uapsd_queues access is racy here. If the value is
258 * changed via debugfs, user needs to reassociate manually to have
259 * everything in sync.
261 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
262 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
263 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
266 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
267 ieee80211_stop_queues_by_reason(&local->hw,
268 IEEE80211_MAX_QUEUE_MAP,
269 IEEE80211_QUEUE_STOP_REASON_PS,
271 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
272 ieee80211_queue_work(&local->hw,
273 &local->dynamic_ps_disable_work);
276 /* Don't restart the timer if we're not disassociated */
277 if (!ifmgd->associated)
280 mod_timer(&local->dynamic_ps_timer, jiffies +
281 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
286 static ieee80211_tx_result debug_noinline
287 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
290 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
291 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
294 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
297 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
298 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
299 !ieee80211_is_probe_req(hdr->frame_control) &&
300 !ieee80211_is_any_nullfunc(hdr->frame_control))
302 * When software scanning only nullfunc frames (to notify
303 * the sleep state to the AP) and probe requests (for the
304 * active scan) are allowed, all other frames should not be
305 * sent and we should not get here, but if we do
306 * nonetheless, drop them to avoid sending them
307 * off-channel. See the link below and
308 * ieee80211_start_scan() for more.
310 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
314 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
317 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
320 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
324 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
326 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
327 if (unlikely(!assoc &&
328 ieee80211_is_data(hdr->frame_control))) {
329 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
330 sdata_info(tx->sdata,
331 "dropped data frame to not associated station %pM\n",
334 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
337 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
338 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
340 * No associated STAs - no need to send multicast
349 /* This function is called whenever the AP is about to exceed the maximum limit
350 * of buffered frames for power saving STAs. This situation should not really
351 * happen often during normal operation, so dropping the oldest buffered packet
352 * from each queue should be OK to make some room for new frames. */
353 static void purge_old_ps_buffers(struct ieee80211_local *local)
355 int total = 0, purged = 0;
357 struct ieee80211_sub_if_data *sdata;
358 struct sta_info *sta;
360 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
363 if (sdata->vif.type == NL80211_IFTYPE_AP)
364 ps = &sdata->u.ap.ps;
365 else if (ieee80211_vif_is_mesh(&sdata->vif))
366 ps = &sdata->u.mesh.ps;
370 skb = skb_dequeue(&ps->bc_buf);
373 ieee80211_free_txskb(&local->hw, skb);
375 total += skb_queue_len(&ps->bc_buf);
379 * Drop one frame from each station from the lowest-priority
380 * AC that has frames at all.
382 list_for_each_entry_rcu(sta, &local->sta_list, list) {
385 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
386 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
387 total += skb_queue_len(&sta->ps_tx_buf[ac]);
390 ieee80211_free_txskb(&local->hw, skb);
396 local->total_ps_buffered = total;
397 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
400 static ieee80211_tx_result
401 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
403 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
404 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
408 * broadcast/multicast frame
410 * If any of the associated/peer stations is in power save mode,
411 * the frame is buffered to be sent after DTIM beacon frame.
412 * This is done either by the hardware or us.
415 /* powersaving STAs currently only in AP/VLAN/mesh mode */
416 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
417 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
421 ps = &tx->sdata->bss->ps;
422 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
423 ps = &tx->sdata->u.mesh.ps;
429 /* no buffering for ordered frames */
430 if (ieee80211_has_order(hdr->frame_control))
433 if (ieee80211_is_probe_req(hdr->frame_control))
436 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
437 info->hw_queue = tx->sdata->vif.cab_queue;
439 /* no stations in PS mode and no buffered packets */
440 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
443 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
445 /* device releases frame after DTIM beacon */
446 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
449 /* buffered in mac80211 */
450 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
451 purge_old_ps_buffers(tx->local);
453 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
455 "BC TX buffer full - dropping the oldest frame\n");
456 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
458 tx->local->total_ps_buffered++;
460 skb_queue_tail(&ps->bc_buf, tx->skb);
465 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
468 if (!ieee80211_is_mgmt(fc))
471 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
474 if (!ieee80211_is_robust_mgmt_frame(skb))
480 static ieee80211_tx_result
481 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
483 struct sta_info *sta = tx->sta;
484 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
485 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
486 struct ieee80211_local *local = tx->local;
491 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
492 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
493 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
494 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
495 int ac = skb_get_queue_mapping(tx->skb);
497 if (ieee80211_is_mgmt(hdr->frame_control) &&
498 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
499 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
503 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
504 sta->sta.addr, sta->sta.aid, ac);
505 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
506 purge_old_ps_buffers(tx->local);
508 /* sync with ieee80211_sta_ps_deliver_wakeup */
509 spin_lock(&sta->ps_lock);
511 * STA woke up the meantime and all the frames on ps_tx_buf have
512 * been queued to pending queue. No reordering can happen, go
513 * ahead and Tx the packet.
515 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
516 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
517 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
518 spin_unlock(&sta->ps_lock);
522 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
523 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
525 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
527 ieee80211_free_txskb(&local->hw, old);
529 tx->local->total_ps_buffered++;
531 info->control.jiffies = jiffies;
532 info->control.vif = &tx->sdata->vif;
533 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
534 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
535 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
536 spin_unlock(&sta->ps_lock);
538 if (!timer_pending(&local->sta_cleanup))
539 mod_timer(&local->sta_cleanup,
540 round_jiffies(jiffies +
541 STA_INFO_CLEANUP_INTERVAL));
544 * We queued up some frames, so the TIM bit might
545 * need to be set, recalculate it.
547 sta_info_recalc_tim(sta);
550 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
552 "STA %pM in PS mode, but polling/in SP -> send frame\n",
559 static ieee80211_tx_result debug_noinline
560 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
562 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
565 if (tx->flags & IEEE80211_TX_UNICAST)
566 return ieee80211_tx_h_unicast_ps_buf(tx);
568 return ieee80211_tx_h_multicast_ps_buf(tx);
571 static ieee80211_tx_result debug_noinline
572 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
574 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
576 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
577 if (tx->sdata->control_port_no_encrypt)
578 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
579 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
580 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
586 static ieee80211_tx_result debug_noinline
587 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
589 struct ieee80211_key *key;
590 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
591 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
593 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
596 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
598 else if (ieee80211_is_group_privacy_action(tx->skb) &&
599 (key = rcu_dereference(tx->sdata->default_multicast_key)))
601 else if (ieee80211_is_mgmt(hdr->frame_control) &&
602 is_multicast_ether_addr(hdr->addr1) &&
603 ieee80211_is_robust_mgmt_frame(tx->skb) &&
604 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
606 else if (is_multicast_ether_addr(hdr->addr1) &&
607 (key = rcu_dereference(tx->sdata->default_multicast_key)))
609 else if (!is_multicast_ether_addr(hdr->addr1) &&
610 (key = rcu_dereference(tx->sdata->default_unicast_key)))
616 bool skip_hw = false;
618 /* TODO: add threshold stuff again */
620 switch (tx->key->conf.cipher) {
621 case WLAN_CIPHER_SUITE_WEP40:
622 case WLAN_CIPHER_SUITE_WEP104:
623 case WLAN_CIPHER_SUITE_TKIP:
624 if (!ieee80211_is_data_present(hdr->frame_control))
627 case WLAN_CIPHER_SUITE_CCMP:
628 case WLAN_CIPHER_SUITE_CCMP_256:
629 case WLAN_CIPHER_SUITE_GCMP:
630 case WLAN_CIPHER_SUITE_GCMP_256:
631 if (!ieee80211_is_data_present(hdr->frame_control) &&
632 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
634 !ieee80211_is_group_privacy_action(tx->skb))
637 skip_hw = (tx->key->conf.flags &
638 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
639 ieee80211_is_mgmt(hdr->frame_control);
641 case WLAN_CIPHER_SUITE_AES_CMAC:
642 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
643 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
644 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
645 if (!ieee80211_is_mgmt(hdr->frame_control))
650 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
651 !ieee80211_is_deauth(hdr->frame_control)))
654 if (!skip_hw && tx->key &&
655 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
656 info->control.hw_key = &tx->key->conf;
662 static ieee80211_tx_result debug_noinline
663 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
665 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
666 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
667 struct ieee80211_supported_band *sband;
669 struct ieee80211_tx_rate_control txrc;
670 struct ieee80211_sta_rates *ratetbl = NULL;
673 memset(&txrc, 0, sizeof(txrc));
675 sband = tx->local->hw.wiphy->bands[info->band];
677 len = min_t(u32, tx->skb->len + FCS_LEN,
678 tx->local->hw.wiphy->frag_threshold);
680 /* set up the tx rate control struct we give the RC algo */
681 txrc.hw = &tx->local->hw;
683 txrc.bss_conf = &tx->sdata->vif.bss_conf;
685 txrc.reported_rate.idx = -1;
686 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
688 if (tx->sdata->rc_has_mcs_mask[info->band])
689 txrc.rate_idx_mcs_mask =
690 tx->sdata->rc_rateidx_mcs_mask[info->band];
692 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
693 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
694 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
695 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
697 /* set up RTS protection if desired */
698 if (len > tx->local->hw.wiphy->rts_threshold) {
702 info->control.use_rts = txrc.rts;
703 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
706 * Use short preamble if the BSS can handle it, but not for
707 * management frames unless we know the receiver can handle
708 * that -- the management frame might be to a station that
709 * just wants a probe response.
711 if (tx->sdata->vif.bss_conf.use_short_preamble &&
712 (ieee80211_is_data(hdr->frame_control) ||
713 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
714 txrc.short_preamble = true;
716 info->control.short_preamble = txrc.short_preamble;
718 /* don't ask rate control when rate already injected via radiotap */
719 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
723 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
726 * Lets not bother rate control if we're associated and cannot
727 * talk to the sta. This should not happen.
729 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
730 !rate_usable_index_exists(sband, &tx->sta->sta),
731 "%s: Dropped data frame as no usable bitrate found while "
732 "scanning and associated. Target station: "
733 "%pM on %d GHz band\n",
734 tx->sdata->name, hdr->addr1,
739 * If we're associated with the sta at this point we know we can at
740 * least send the frame at the lowest bit rate.
742 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
744 if (tx->sta && !info->control.skip_table)
745 ratetbl = rcu_dereference(tx->sta->sta.rates);
747 if (unlikely(info->control.rates[0].idx < 0)) {
749 struct ieee80211_tx_rate rate = {
750 .idx = ratetbl->rate[0].idx,
751 .flags = ratetbl->rate[0].flags,
752 .count = ratetbl->rate[0].count
755 if (ratetbl->rate[0].idx < 0)
763 tx->rate = info->control.rates[0];
766 if (txrc.reported_rate.idx < 0) {
767 txrc.reported_rate = tx->rate;
768 if (tx->sta && ieee80211_is_data(hdr->frame_control))
769 tx->sta->tx_stats.last_rate = txrc.reported_rate;
771 tx->sta->tx_stats.last_rate = txrc.reported_rate;
776 if (unlikely(!info->control.rates[0].count))
777 info->control.rates[0].count = 1;
779 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
780 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
781 info->control.rates[0].count = 1;
786 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
788 u16 *seq = &sta->tid_seq[tid];
789 __le16 ret = cpu_to_le16(*seq);
791 /* Increase the sequence number. */
792 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
797 static ieee80211_tx_result debug_noinline
798 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
800 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
801 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
805 * Packet injection may want to control the sequence
806 * number, if we have no matching interface then we
807 * neither assign one ourselves nor ask the driver to.
809 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
812 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
815 if (ieee80211_hdrlen(hdr->frame_control) < 24)
818 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
822 * Anything but QoS data that has a sequence number field
823 * (is long enough) gets a sequence number from the global
824 * counter. QoS data frames with a multicast destination
825 * also use the global counter (802.11-2012 9.3.2.10).
827 if (!ieee80211_is_data_qos(hdr->frame_control) ||
828 is_multicast_ether_addr(hdr->addr1)) {
829 if (tx->flags & IEEE80211_TX_NO_SEQNO)
831 /* driver should assign sequence number */
832 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
833 /* for pure STA mode without beacons, we can do it */
834 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
835 tx->sdata->sequence_number += 0x10;
837 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
842 * This should be true for injected/management frames only, for
843 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
844 * above since they are not QoS-data frames.
849 /* include per-STA, per-TID sequence counter */
850 tid = ieee80211_get_tid(hdr);
851 tx->sta->tx_stats.msdu[tid]++;
853 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
858 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
859 struct sk_buff *skb, int hdrlen,
862 struct ieee80211_local *local = tx->local;
863 struct ieee80211_tx_info *info;
865 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
866 int pos = hdrlen + per_fragm;
867 int rem = skb->len - hdrlen - per_fragm;
869 if (WARN_ON(rem < 0))
872 /* first fragment was already added to queue by caller */
875 int fraglen = per_fragm;
880 tmp = dev_alloc_skb(local->tx_headroom +
882 tx->sdata->encrypt_headroom +
883 IEEE80211_ENCRYPT_TAILROOM);
887 __skb_queue_tail(&tx->skbs, tmp);
890 local->tx_headroom + tx->sdata->encrypt_headroom);
892 /* copy control information */
893 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
895 info = IEEE80211_SKB_CB(tmp);
896 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
897 IEEE80211_TX_CTL_FIRST_FRAGMENT);
900 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
902 skb_copy_queue_mapping(tmp, skb);
903 tmp->priority = skb->priority;
906 /* copy header and data */
907 skb_put_data(tmp, skb->data, hdrlen);
908 skb_put_data(tmp, skb->data + pos, fraglen);
913 /* adjust first fragment's length */
914 skb_trim(skb, hdrlen + per_fragm);
918 static ieee80211_tx_result debug_noinline
919 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
921 struct sk_buff *skb = tx->skb;
922 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
923 struct ieee80211_hdr *hdr = (void *)skb->data;
924 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
928 /* no matter what happens, tx->skb moves to tx->skbs */
929 __skb_queue_tail(&tx->skbs, skb);
932 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
935 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
939 * Warn when submitting a fragmented A-MPDU frame and drop it.
940 * This scenario is handled in ieee80211_tx_prepare but extra
941 * caution taken here as fragmented ampdu may cause Tx stop.
943 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
946 hdrlen = ieee80211_hdrlen(hdr->frame_control);
948 /* internal error, why isn't DONTFRAG set? */
949 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
953 * Now fragment the frame. This will allocate all the fragments and
954 * chain them (using skb as the first fragment) to skb->next.
955 * During transmission, we will remove the successfully transmitted
956 * fragments from this list. When the low-level driver rejects one
957 * of the fragments then we will simply pretend to accept the skb
958 * but store it away as pending.
960 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
963 /* update duration/seq/flags of fragments */
966 skb_queue_walk(&tx->skbs, skb) {
967 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
969 hdr = (void *)skb->data;
970 info = IEEE80211_SKB_CB(skb);
972 if (!skb_queue_is_last(&tx->skbs, skb)) {
973 hdr->frame_control |= morefrags;
975 * No multi-rate retries for fragmented frames, that
976 * would completely throw off the NAV at other STAs.
978 info->control.rates[1].idx = -1;
979 info->control.rates[2].idx = -1;
980 info->control.rates[3].idx = -1;
981 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
982 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
984 hdr->frame_control &= ~morefrags;
986 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
993 static ieee80211_tx_result debug_noinline
994 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1002 skb_queue_walk(&tx->skbs, skb) {
1003 ac = skb_get_queue_mapping(skb);
1004 tx->sta->tx_stats.bytes[ac] += skb->len;
1007 tx->sta->tx_stats.packets[ac]++;
1012 static ieee80211_tx_result debug_noinline
1013 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1018 switch (tx->key->conf.cipher) {
1019 case WLAN_CIPHER_SUITE_WEP40:
1020 case WLAN_CIPHER_SUITE_WEP104:
1021 return ieee80211_crypto_wep_encrypt(tx);
1022 case WLAN_CIPHER_SUITE_TKIP:
1023 return ieee80211_crypto_tkip_encrypt(tx);
1024 case WLAN_CIPHER_SUITE_CCMP:
1025 return ieee80211_crypto_ccmp_encrypt(
1026 tx, IEEE80211_CCMP_MIC_LEN);
1027 case WLAN_CIPHER_SUITE_CCMP_256:
1028 return ieee80211_crypto_ccmp_encrypt(
1029 tx, IEEE80211_CCMP_256_MIC_LEN);
1030 case WLAN_CIPHER_SUITE_AES_CMAC:
1031 return ieee80211_crypto_aes_cmac_encrypt(tx);
1032 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1033 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1034 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1035 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1036 return ieee80211_crypto_aes_gmac_encrypt(tx);
1037 case WLAN_CIPHER_SUITE_GCMP:
1038 case WLAN_CIPHER_SUITE_GCMP_256:
1039 return ieee80211_crypto_gcmp_encrypt(tx);
1041 return ieee80211_crypto_hw_encrypt(tx);
1047 static ieee80211_tx_result debug_noinline
1048 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1050 struct sk_buff *skb;
1051 struct ieee80211_hdr *hdr;
1055 skb_queue_walk(&tx->skbs, skb) {
1056 hdr = (void *) skb->data;
1057 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1058 break; /* must not overwrite AID */
1059 if (!skb_queue_is_last(&tx->skbs, skb)) {
1060 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1061 next_len = next->len;
1064 group_addr = is_multicast_ether_addr(hdr->addr1);
1067 ieee80211_duration(tx, skb, group_addr, next_len);
1073 /* actual transmit path */
1075 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1076 struct sk_buff *skb,
1077 struct ieee80211_tx_info *info,
1078 struct tid_ampdu_tx *tid_tx,
1081 bool queued = false;
1082 bool reset_agg_timer = false;
1083 struct sk_buff *purge_skb = NULL;
1085 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1086 info->flags |= IEEE80211_TX_CTL_AMPDU;
1087 reset_agg_timer = true;
1088 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1090 * nothing -- this aggregation session is being started
1091 * but that might still fail with the driver
1093 } else if (!tx->sta->sta.txq[tid]) {
1094 spin_lock(&tx->sta->lock);
1096 * Need to re-check now, because we may get here
1098 * 1) in the window during which the setup is actually
1099 * already done, but not marked yet because not all
1100 * packets are spliced over to the driver pending
1101 * queue yet -- if this happened we acquire the lock
1102 * either before or after the splice happens, but
1103 * need to recheck which of these cases happened.
1105 * 2) during session teardown, if the OPERATIONAL bit
1106 * was cleared due to the teardown but the pointer
1107 * hasn't been assigned NULL yet (or we loaded it
1108 * before it was assigned) -- in this case it may
1109 * now be NULL which means we should just let the
1110 * packet pass through because splicing the frames
1111 * back is already done.
1113 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1116 /* do nothing, let packet pass through */
1117 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1118 info->flags |= IEEE80211_TX_CTL_AMPDU;
1119 reset_agg_timer = true;
1122 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1123 clear_sta_flag(tx->sta, WLAN_STA_SP);
1124 ps_dbg(tx->sta->sdata,
1125 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1126 tx->sta->sta.addr, tx->sta->sta.aid);
1128 info->control.vif = &tx->sdata->vif;
1129 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1130 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1131 __skb_queue_tail(&tid_tx->pending, skb);
1132 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1133 purge_skb = __skb_dequeue(&tid_tx->pending);
1135 spin_unlock(&tx->sta->lock);
1138 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1141 /* reset session timer */
1142 if (reset_agg_timer)
1143 tid_tx->last_tx = jiffies;
1150 * pass %NULL for the station if unknown, a valid pointer if known
1151 * or an ERR_PTR() if the station is known not to exist
1153 static ieee80211_tx_result
1154 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1155 struct ieee80211_tx_data *tx,
1156 struct sta_info *sta, struct sk_buff *skb)
1158 struct ieee80211_local *local = sdata->local;
1159 struct ieee80211_hdr *hdr;
1160 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1163 memset(tx, 0, sizeof(*tx));
1167 __skb_queue_head_init(&tx->skbs);
1170 * If this flag is set to true anywhere, and we get here,
1171 * we are doing the needed processing, so remove the flag
1174 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1176 hdr = (struct ieee80211_hdr *) skb->data;
1182 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1183 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1184 if (!tx->sta && sdata->wdev.use_4addr)
1186 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1187 IEEE80211_TX_CTL_INJECTED) ||
1188 tx->sdata->control_port_protocol == tx->skb->protocol) {
1189 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1191 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1192 tx->sta = sta_info_get(sdata, hdr->addr1);
1195 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1196 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1197 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1198 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1199 struct tid_ampdu_tx *tid_tx;
1201 tid = ieee80211_get_tid(hdr);
1203 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1207 queued = ieee80211_tx_prep_agg(tx, skb, info,
1210 if (unlikely(queued))
1215 if (is_multicast_ether_addr(hdr->addr1)) {
1216 tx->flags &= ~IEEE80211_TX_UNICAST;
1217 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1219 tx->flags |= IEEE80211_TX_UNICAST;
1221 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1222 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1223 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1224 info->flags & IEEE80211_TX_CTL_AMPDU)
1225 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1229 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1230 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1231 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1232 ieee80211_check_fast_xmit(tx->sta);
1235 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1240 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1241 struct ieee80211_vif *vif,
1242 struct sta_info *sta,
1243 struct sk_buff *skb)
1245 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1246 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1247 struct ieee80211_txq *txq = NULL;
1249 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1250 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1253 if (!(info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) &&
1254 unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
1255 if ((!ieee80211_is_mgmt(hdr->frame_control) ||
1256 ieee80211_is_bufferable_mmpdu(hdr->frame_control) ||
1257 vif->type == NL80211_IFTYPE_STATION) &&
1258 sta && sta->uploaded) {
1260 * This will be NULL if the driver didn't set the
1261 * opt-in hardware flag.
1263 txq = sta->sta.txq[IEEE80211_NUM_TIDS];
1266 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1271 txq = sta->sta.txq[tid];
1279 return to_txq_info(txq);
1282 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1284 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1287 static u32 codel_skb_len_func(const struct sk_buff *skb)
1292 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1294 const struct ieee80211_tx_info *info;
1296 info = (const struct ieee80211_tx_info *)skb->cb;
1297 return info->control.enqueue_time;
1300 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1303 struct ieee80211_local *local;
1304 struct txq_info *txqi;
1306 struct fq_flow *flow;
1309 local = vif_to_sdata(txqi->txq.vif)->local;
1312 if (cvars == &txqi->def_cvars)
1313 flow = &txqi->def_flow;
1315 flow = &fq->flows[cvars - local->cvars];
1317 return fq_flow_dequeue(fq, flow);
1320 static void codel_drop_func(struct sk_buff *skb,
1323 struct ieee80211_local *local;
1324 struct ieee80211_hw *hw;
1325 struct txq_info *txqi;
1328 local = vif_to_sdata(txqi->txq.vif)->local;
1331 ieee80211_free_txskb(hw, skb);
1334 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1336 struct fq_flow *flow)
1338 struct ieee80211_local *local;
1339 struct txq_info *txqi;
1340 struct codel_vars *cvars;
1341 struct codel_params *cparams;
1342 struct codel_stats *cstats;
1344 local = container_of(fq, struct ieee80211_local, fq);
1345 txqi = container_of(tin, struct txq_info, tin);
1346 cstats = &txqi->cstats;
1348 if (txqi->txq.sta) {
1349 struct sta_info *sta = container_of(txqi->txq.sta,
1350 struct sta_info, sta);
1351 cparams = &sta->cparams;
1353 cparams = &local->cparams;
1356 if (flow == &txqi->def_flow)
1357 cvars = &txqi->def_cvars;
1359 cvars = &local->cvars[flow - fq->flows];
1361 return codel_dequeue(txqi,
1367 codel_skb_time_func,
1369 codel_dequeue_func);
1372 static void fq_skb_free_func(struct fq *fq,
1374 struct fq_flow *flow,
1375 struct sk_buff *skb)
1377 struct ieee80211_local *local;
1379 local = container_of(fq, struct ieee80211_local, fq);
1380 ieee80211_free_txskb(&local->hw, skb);
1383 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1386 struct sk_buff *skb)
1388 struct txq_info *txqi;
1390 txqi = container_of(tin, struct txq_info, tin);
1391 return &txqi->def_flow;
1394 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1395 struct txq_info *txqi,
1396 struct sk_buff *skb)
1398 struct fq *fq = &local->fq;
1399 struct fq_tin *tin = &txqi->tin;
1400 u32 flow_idx = fq_flow_idx(fq, skb);
1402 ieee80211_set_skb_enqueue_time(skb);
1404 spin_lock_bh(&fq->lock);
1405 fq_tin_enqueue(fq, tin, flow_idx, skb,
1407 fq_flow_get_default_func);
1408 spin_unlock_bh(&fq->lock);
1411 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1412 struct fq_flow *flow, struct sk_buff *skb,
1415 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1417 return info->control.vif == data;
1420 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1421 struct ieee80211_sub_if_data *sdata)
1423 struct fq *fq = &local->fq;
1424 struct txq_info *txqi;
1426 struct ieee80211_sub_if_data *ap;
1428 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1431 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1436 txqi = to_txq_info(ap->vif.txq);
1439 spin_lock_bh(&fq->lock);
1440 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1442 spin_unlock_bh(&fq->lock);
1445 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1446 struct sta_info *sta,
1447 struct txq_info *txqi, int tid)
1449 fq_tin_init(&txqi->tin);
1450 fq_flow_init(&txqi->def_flow);
1451 codel_vars_init(&txqi->def_cvars);
1452 codel_stats_init(&txqi->cstats);
1453 __skb_queue_head_init(&txqi->frags);
1454 INIT_LIST_HEAD(&txqi->schedule_order);
1456 txqi->txq.vif = &sdata->vif;
1459 sdata->vif.txq = &txqi->txq;
1461 txqi->txq.ac = IEEE80211_AC_BE;
1466 if (tid == IEEE80211_NUM_TIDS) {
1467 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1468 /* Drivers need to opt in to the management MPDU TXQ */
1469 if (!ieee80211_hw_check(&sdata->local->hw,
1472 } else if (!ieee80211_hw_check(&sdata->local->hw,
1474 /* Drivers need to opt in to the bufferable MMPDU TXQ */
1477 txqi->txq.ac = IEEE80211_AC_VO;
1479 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1482 txqi->txq.sta = &sta->sta;
1483 txqi->txq.tid = tid;
1484 sta->sta.txq[tid] = &txqi->txq;
1487 void ieee80211_txq_purge(struct ieee80211_local *local,
1488 struct txq_info *txqi)
1490 struct fq *fq = &local->fq;
1491 struct fq_tin *tin = &txqi->tin;
1493 spin_lock_bh(&fq->lock);
1494 fq_tin_reset(fq, tin, fq_skb_free_func);
1495 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1496 spin_unlock_bh(&fq->lock);
1498 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]);
1499 list_del_init(&txqi->schedule_order);
1500 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]);
1503 void ieee80211_txq_set_params(struct ieee80211_local *local)
1505 if (local->hw.wiphy->txq_limit)
1506 local->fq.limit = local->hw.wiphy->txq_limit;
1508 local->hw.wiphy->txq_limit = local->fq.limit;
1510 if (local->hw.wiphy->txq_memory_limit)
1511 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1513 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1515 if (local->hw.wiphy->txq_quantum)
1516 local->fq.quantum = local->hw.wiphy->txq_quantum;
1518 local->hw.wiphy->txq_quantum = local->fq.quantum;
1521 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1523 struct fq *fq = &local->fq;
1526 bool supp_vht = false;
1527 enum nl80211_band band;
1529 if (!local->ops->wake_tx_queue)
1532 ret = fq_init(fq, 4096);
1537 * If the hardware doesn't support VHT, it is safe to limit the maximum
1538 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1540 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1541 struct ieee80211_supported_band *sband;
1543 sband = local->hw.wiphy->bands[band];
1547 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1551 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1553 codel_params_init(&local->cparams);
1554 local->cparams.interval = MS2TIME(100);
1555 local->cparams.target = MS2TIME(20);
1556 local->cparams.ecn = true;
1558 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1560 if (!local->cvars) {
1561 spin_lock_bh(&fq->lock);
1562 fq_reset(fq, fq_skb_free_func);
1563 spin_unlock_bh(&fq->lock);
1567 for (i = 0; i < fq->flows_cnt; i++)
1568 codel_vars_init(&local->cvars[i]);
1570 ieee80211_txq_set_params(local);
1575 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1577 struct fq *fq = &local->fq;
1579 if (!local->ops->wake_tx_queue)
1582 kfree(local->cvars);
1583 local->cvars = NULL;
1585 spin_lock_bh(&fq->lock);
1586 fq_reset(fq, fq_skb_free_func);
1587 spin_unlock_bh(&fq->lock);
1590 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1591 struct ieee80211_sub_if_data *sdata,
1592 struct sta_info *sta,
1593 struct sk_buff *skb)
1595 struct ieee80211_vif *vif;
1596 struct txq_info *txqi;
1598 if (!local->ops->wake_tx_queue ||
1599 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1602 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1603 sdata = container_of(sdata->bss,
1604 struct ieee80211_sub_if_data, u.ap);
1607 txqi = ieee80211_get_txq(local, vif, sta, skb);
1612 ieee80211_txq_enqueue(local, txqi, skb);
1614 schedule_and_wake_txq(local, txqi);
1619 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1620 struct ieee80211_vif *vif,
1621 struct sta_info *sta,
1622 struct sk_buff_head *skbs,
1625 struct ieee80211_tx_control control = {};
1626 struct sk_buff *skb, *tmp;
1627 unsigned long flags;
1629 skb_queue_walk_safe(skbs, skb, tmp) {
1630 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1631 int q = info->hw_queue;
1633 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1634 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1635 __skb_unlink(skb, skbs);
1636 ieee80211_free_txskb(&local->hw, skb);
1641 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1642 if (local->queue_stop_reasons[q] ||
1643 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1644 if (unlikely(info->flags &
1645 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1646 if (local->queue_stop_reasons[q] &
1647 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1649 * Drop off-channel frames if queues
1650 * are stopped for any reason other
1651 * than off-channel operation. Never
1654 spin_unlock_irqrestore(
1655 &local->queue_stop_reason_lock,
1657 ieee80211_purge_tx_queue(&local->hw,
1664 * Since queue is stopped, queue up frames for
1665 * later transmission from the tx-pending
1666 * tasklet when the queue is woken again.
1669 skb_queue_splice_init(skbs,
1670 &local->pending[q]);
1672 skb_queue_splice_tail_init(skbs,
1673 &local->pending[q]);
1675 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1680 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1682 info->control.vif = vif;
1683 control.sta = sta ? &sta->sta : NULL;
1685 __skb_unlink(skb, skbs);
1686 drv_tx(local, &control, skb);
1693 * Returns false if the frame couldn't be transmitted but was queued instead.
1695 static bool __ieee80211_tx(struct ieee80211_local *local,
1696 struct sk_buff_head *skbs, int led_len,
1697 struct sta_info *sta, bool txpending)
1699 struct ieee80211_tx_info *info;
1700 struct ieee80211_sub_if_data *sdata;
1701 struct ieee80211_vif *vif;
1702 struct sk_buff *skb;
1706 if (WARN_ON(skb_queue_empty(skbs)))
1709 skb = skb_peek(skbs);
1710 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1711 info = IEEE80211_SKB_CB(skb);
1712 sdata = vif_to_sdata(info->control.vif);
1713 if (sta && !sta->uploaded)
1716 switch (sdata->vif.type) {
1717 case NL80211_IFTYPE_MONITOR:
1718 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1722 sdata = rcu_dereference(local->monitor_sdata);
1726 vif->hw_queue[skb_get_queue_mapping(skb)];
1727 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1728 ieee80211_purge_tx_queue(&local->hw, skbs);
1733 case NL80211_IFTYPE_AP_VLAN:
1734 sdata = container_of(sdata->bss,
1735 struct ieee80211_sub_if_data, u.ap);
1742 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending);
1744 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1746 WARN_ON_ONCE(!skb_queue_empty(skbs));
1752 * Invoke TX handlers, return 0 on success and non-zero if the
1753 * frame was dropped or queued.
1755 * The handlers are split into an early and late part. The latter is everything
1756 * that can be sensitive to reordering, and will be deferred to after packets
1757 * are dequeued from the intermediate queues (when they are enabled).
1759 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1761 ieee80211_tx_result res = TX_DROP;
1763 #define CALL_TXH(txh) \
1766 if (res != TX_CONTINUE) \
1770 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1771 CALL_TXH(ieee80211_tx_h_check_assoc);
1772 CALL_TXH(ieee80211_tx_h_ps_buf);
1773 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1774 CALL_TXH(ieee80211_tx_h_select_key);
1775 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1776 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1779 if (unlikely(res == TX_DROP)) {
1780 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1782 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1784 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1786 } else if (unlikely(res == TX_QUEUED)) {
1787 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1795 * Late handlers can be called while the sta lock is held. Handlers that can
1796 * cause packets to be generated will cause deadlock!
1798 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1800 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1801 ieee80211_tx_result res = TX_CONTINUE;
1803 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1804 __skb_queue_tail(&tx->skbs, tx->skb);
1809 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1810 CALL_TXH(ieee80211_tx_h_sequence);
1811 CALL_TXH(ieee80211_tx_h_fragment);
1812 /* handlers after fragment must be aware of tx info fragmentation! */
1813 CALL_TXH(ieee80211_tx_h_stats);
1814 CALL_TXH(ieee80211_tx_h_encrypt);
1815 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1816 CALL_TXH(ieee80211_tx_h_calculate_duration);
1820 if (unlikely(res == TX_DROP)) {
1821 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1823 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1825 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1827 } else if (unlikely(res == TX_QUEUED)) {
1828 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1835 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1837 int r = invoke_tx_handlers_early(tx);
1841 return invoke_tx_handlers_late(tx);
1844 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1845 struct ieee80211_vif *vif, struct sk_buff *skb,
1846 int band, struct ieee80211_sta **sta)
1848 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1849 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1850 struct ieee80211_tx_data tx;
1851 struct sk_buff *skb2;
1853 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1857 info->control.vif = vif;
1858 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1860 if (invoke_tx_handlers(&tx))
1865 *sta = &tx.sta->sta;
1870 /* this function isn't suitable for fragmented data frames */
1871 skb2 = __skb_dequeue(&tx.skbs);
1872 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1873 ieee80211_free_txskb(hw, skb2);
1874 ieee80211_purge_tx_queue(hw, &tx.skbs);
1880 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1883 * Returns false if the frame couldn't be transmitted but was queued instead.
1885 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1886 struct sta_info *sta, struct sk_buff *skb,
1887 bool txpending, u32 txdata_flags)
1889 struct ieee80211_local *local = sdata->local;
1890 struct ieee80211_tx_data tx;
1891 ieee80211_tx_result res_prepare;
1892 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1896 if (unlikely(skb->len < 10)) {
1901 /* initialises tx */
1903 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1905 tx.flags |= txdata_flags;
1907 if (unlikely(res_prepare == TX_DROP)) {
1908 ieee80211_free_txskb(&local->hw, skb);
1910 } else if (unlikely(res_prepare == TX_QUEUED)) {
1914 /* set up hw_queue value early */
1915 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1916 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1918 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1920 if (invoke_tx_handlers_early(&tx))
1923 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1926 if (!invoke_tx_handlers_late(&tx))
1927 result = __ieee80211_tx(local, &tx.skbs, led_len,
1933 /* device xmit handlers */
1935 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1936 struct sk_buff *skb,
1937 int head_need, bool may_encrypt)
1939 struct ieee80211_local *local = sdata->local;
1940 struct ieee80211_hdr *hdr;
1944 hdr = (struct ieee80211_hdr *) skb->data;
1945 enc_tailroom = may_encrypt &&
1946 (sdata->crypto_tx_tailroom_needed_cnt ||
1947 ieee80211_is_mgmt(hdr->frame_control));
1950 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1951 tail_need -= skb_tailroom(skb);
1952 tail_need = max_t(int, tail_need, 0);
1955 if (skb_cloned(skb) &&
1956 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1957 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
1958 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1959 else if (head_need || tail_need)
1960 I802_DEBUG_INC(local->tx_expand_skb_head);
1964 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1965 wiphy_debug(local->hw.wiphy,
1966 "failed to reallocate TX buffer\n");
1973 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1974 struct sta_info *sta, struct sk_buff *skb,
1977 struct ieee80211_local *local = sdata->local;
1978 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1979 struct ieee80211_hdr *hdr;
1983 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1985 headroom = local->tx_headroom;
1987 headroom += sdata->encrypt_headroom;
1988 headroom -= skb_headroom(skb);
1989 headroom = max_t(int, 0, headroom);
1991 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1992 ieee80211_free_txskb(&local->hw, skb);
1996 hdr = (struct ieee80211_hdr *) skb->data;
1997 info->control.vif = &sdata->vif;
1999 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2000 if (ieee80211_is_data(hdr->frame_control) &&
2001 is_unicast_ether_addr(hdr->addr1)) {
2002 if (mesh_nexthop_resolve(sdata, skb))
2003 return; /* skb queued: don't free */
2005 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2009 ieee80211_set_qos_hdr(sdata, skb);
2010 ieee80211_tx(sdata, sta, skb, false, txdata_flags);
2013 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
2014 struct sk_buff *skb)
2016 struct ieee80211_radiotap_iterator iterator;
2017 struct ieee80211_radiotap_header *rthdr =
2018 (struct ieee80211_radiotap_header *) skb->data;
2019 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2020 struct ieee80211_supported_band *sband =
2021 local->hw.wiphy->bands[info->band];
2022 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2026 bool rate_found = false;
2027 u8 rate_retries = 0;
2029 u8 mcs_known, mcs_flags, mcs_bw;
2031 u8 vht_mcs = 0, vht_nss = 0;
2034 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2035 IEEE80211_TX_CTL_DONTFRAG;
2038 * for every radiotap entry that is present
2039 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2040 * entries present, or -EINVAL on error)
2044 ret = ieee80211_radiotap_iterator_next(&iterator);
2049 /* see if this argument is something we can use */
2050 switch (iterator.this_arg_index) {
2052 * You must take care when dereferencing iterator.this_arg
2053 * for multibyte types... the pointer is not aligned. Use
2054 * get_unaligned((type *)iterator.this_arg) to dereference
2055 * iterator.this_arg for type "type" safely on all arches.
2057 case IEEE80211_RADIOTAP_FLAGS:
2058 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2060 * this indicates that the skb we have been
2061 * handed has the 32-bit FCS CRC at the end...
2062 * we should react to that by snipping it off
2063 * because it will be recomputed and added
2066 if (skb->len < (iterator._max_length + FCS_LEN))
2069 skb_trim(skb, skb->len - FCS_LEN);
2071 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2072 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2073 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2074 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2077 case IEEE80211_RADIOTAP_TX_FLAGS:
2078 txflags = get_unaligned_le16(iterator.this_arg);
2079 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2080 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2083 case IEEE80211_RADIOTAP_RATE:
2084 rate = *iterator.this_arg;
2089 case IEEE80211_RADIOTAP_DATA_RETRIES:
2090 rate_retries = *iterator.this_arg;
2093 case IEEE80211_RADIOTAP_MCS:
2094 mcs_known = iterator.this_arg[0];
2095 mcs_flags = iterator.this_arg[1];
2096 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2100 rate = iterator.this_arg[2];
2101 rate_flags = IEEE80211_TX_RC_MCS;
2103 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2104 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2105 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2107 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2108 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2109 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2110 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2113 case IEEE80211_RADIOTAP_VHT:
2114 vht_known = get_unaligned_le16(iterator.this_arg);
2117 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2118 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2119 (iterator.this_arg[2] &
2120 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2121 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2123 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2124 if (iterator.this_arg[3] == 1)
2126 IEEE80211_TX_RC_40_MHZ_WIDTH;
2127 else if (iterator.this_arg[3] == 4)
2129 IEEE80211_TX_RC_80_MHZ_WIDTH;
2130 else if (iterator.this_arg[3] == 11)
2132 IEEE80211_TX_RC_160_MHZ_WIDTH;
2135 vht_mcs = iterator.this_arg[4] >> 4;
2136 vht_nss = iterator.this_arg[4] & 0xF;
2140 * Please update the file
2141 * Documentation/networking/mac80211-injection.txt
2142 * when parsing new fields here.
2150 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2154 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2156 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2157 info->control.rates[i].idx = -1;
2158 info->control.rates[i].flags = 0;
2159 info->control.rates[i].count = 0;
2162 if (rate_flags & IEEE80211_TX_RC_MCS) {
2163 info->control.rates[0].idx = rate;
2164 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2165 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2168 for (i = 0; i < sband->n_bitrates; i++) {
2169 if (rate * 5 != sband->bitrates[i].bitrate)
2172 info->control.rates[0].idx = i;
2177 if (info->control.rates[0].idx < 0)
2178 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2180 info->control.rates[0].flags = rate_flags;
2181 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2182 local->hw.max_rate_tries);
2186 * remove the radiotap header
2187 * iterator->_max_length was sanity-checked against
2188 * skb->len by iterator init
2190 skb_pull(skb, iterator._max_length);
2195 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2196 struct net_device *dev)
2198 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2199 struct ieee80211_chanctx_conf *chanctx_conf;
2200 struct ieee80211_radiotap_header *prthdr =
2201 (struct ieee80211_radiotap_header *)skb->data;
2202 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2203 struct ieee80211_hdr *hdr;
2204 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2205 struct cfg80211_chan_def *chandef;
2209 /* check for not even having the fixed radiotap header part */
2210 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2211 goto fail; /* too short to be possibly valid */
2213 /* is it a header version we can trust to find length from? */
2214 if (unlikely(prthdr->it_version))
2215 goto fail; /* only version 0 is supported */
2217 /* then there must be a radiotap header with a length we can use */
2218 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2220 /* does the skb contain enough to deliver on the alleged length? */
2221 if (unlikely(skb->len < len_rthdr))
2222 goto fail; /* skb too short for claimed rt header extent */
2225 * fix up the pointers accounting for the radiotap
2226 * header still being in there. We are being given
2227 * a precooked IEEE80211 header so no need for
2230 skb_set_mac_header(skb, len_rthdr);
2232 * these are just fixed to the end of the rt area since we
2233 * don't have any better information and at this point, nobody cares
2235 skb_set_network_header(skb, len_rthdr);
2236 skb_set_transport_header(skb, len_rthdr);
2238 if (skb->len < len_rthdr + 2)
2241 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2242 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2244 if (skb->len < len_rthdr + hdrlen)
2248 * Initialize skb->protocol if the injected frame is a data frame
2249 * carrying a rfc1042 header
2251 if (ieee80211_is_data(hdr->frame_control) &&
2252 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2253 u8 *payload = (u8 *)hdr + hdrlen;
2255 if (ether_addr_equal(payload, rfc1042_header))
2256 skb->protocol = cpu_to_be16((payload[6] << 8) |
2261 * Initialize skb->priority for QoS frames. This is put in the TID field
2262 * of the frame before passing it to the driver.
2264 if (ieee80211_is_data_qos(hdr->frame_control)) {
2265 u8 *p = ieee80211_get_qos_ctl(hdr);
2266 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
2269 memset(info, 0, sizeof(*info));
2271 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2272 IEEE80211_TX_CTL_INJECTED;
2277 * We process outgoing injected frames that have a local address
2278 * we handle as though they are non-injected frames.
2279 * This code here isn't entirely correct, the local MAC address
2280 * isn't always enough to find the interface to use; for proper
2281 * VLAN/WDS support we will need a different mechanism (which
2282 * likely isn't going to be monitor interfaces).
2284 * This is necessary, for example, for old hostapd versions that
2285 * don't use nl80211-based management TX/RX.
2287 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2289 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2290 if (!ieee80211_sdata_running(tmp_sdata))
2292 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2293 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2294 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2296 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2302 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2303 if (!chanctx_conf) {
2304 tmp_sdata = rcu_dereference(local->monitor_sdata);
2307 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2311 chandef = &chanctx_conf->def;
2312 else if (!local->use_chanctx)
2313 chandef = &local->_oper_chandef;
2318 * Frame injection is not allowed if beaconing is not allowed
2319 * or if we need radar detection. Beaconing is usually not allowed when
2320 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2321 * Passive scan is also used in world regulatory domains where
2322 * your country is not known and as such it should be treated as
2323 * NO TX unless the channel is explicitly allowed in which case
2324 * your current regulatory domain would not have the passive scan
2327 * Since AP mode uses monitor interfaces to inject/TX management
2328 * frames we can make AP mode the exception to this rule once it
2329 * supports radar detection as its implementation can deal with
2330 * radar detection by itself. We can do that later by adding a
2331 * monitor flag interfaces used for AP support.
2333 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2337 info->band = chandef->chan->band;
2339 /* process and remove the injection radiotap header */
2340 if (!ieee80211_parse_tx_radiotap(local, skb))
2343 ieee80211_xmit(sdata, NULL, skb, 0);
2346 return NETDEV_TX_OK;
2352 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2355 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2357 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2359 return ethertype == ETH_P_TDLS &&
2361 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2364 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2365 struct sk_buff *skb,
2366 struct sta_info **sta_out)
2368 struct sta_info *sta;
2370 switch (sdata->vif.type) {
2371 case NL80211_IFTYPE_AP_VLAN:
2372 sta = rcu_dereference(sdata->u.vlan.sta);
2376 } else if (sdata->wdev.use_4addr) {
2380 case NL80211_IFTYPE_AP:
2381 case NL80211_IFTYPE_OCB:
2382 case NL80211_IFTYPE_ADHOC:
2383 if (is_multicast_ether_addr(skb->data)) {
2384 *sta_out = ERR_PTR(-ENOENT);
2387 sta = sta_info_get_bss(sdata, skb->data);
2389 case NL80211_IFTYPE_WDS:
2390 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2392 #ifdef CONFIG_MAC80211_MESH
2393 case NL80211_IFTYPE_MESH_POINT:
2394 /* determined much later */
2398 case NL80211_IFTYPE_STATION:
2399 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2400 sta = sta_info_get(sdata, skb->data);
2401 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2402 if (test_sta_flag(sta,
2403 WLAN_STA_TDLS_PEER_AUTH)) {
2409 * TDLS link during setup - throw out frames to
2410 * peer. Allow TDLS-setup frames to unauthorized
2411 * peers for the special case of a link teardown
2412 * after a TDLS sta is removed due to being
2415 if (!ieee80211_is_tdls_setup(skb))
2421 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2429 *sta_out = sta ?: ERR_PTR(-ENOENT);
2433 static int ieee80211_store_ack_skb(struct ieee80211_local *local,
2434 struct sk_buff *skb,
2437 struct sk_buff *ack_skb = skb_clone_sk(skb);
2441 unsigned long flags;
2444 spin_lock_irqsave(&local->ack_status_lock, flags);
2445 id = idr_alloc(&local->ack_status_frames, ack_skb,
2446 1, 0x2000, GFP_ATOMIC);
2447 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2451 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2461 * ieee80211_build_hdr - build 802.11 header in the given frame
2462 * @sdata: virtual interface to build the header for
2463 * @skb: the skb to build the header in
2464 * @info_flags: skb flags to set
2465 * @ctrl_flags: info control flags to set
2467 * This function takes the skb with 802.3 header and reformats the header to
2468 * the appropriate IEEE 802.11 header based on which interface the packet is
2469 * being transmitted on.
2471 * Note that this function also takes care of the TX status request and
2472 * potential unsharing of the SKB - this needs to be interleaved with the
2475 * The function requires the read-side RCU lock held
2477 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2479 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2480 struct sk_buff *skb, u32 info_flags,
2481 struct sta_info *sta, u32 ctrl_flags)
2483 struct ieee80211_local *local = sdata->local;
2484 struct ieee80211_tx_info *info;
2486 u16 ethertype, hdrlen, meshhdrlen = 0;
2488 struct ieee80211_hdr hdr;
2489 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2490 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2491 const u8 *encaps_data;
2492 int encaps_len, skip_header_bytes;
2493 bool wme_sta = false, authorized = false;
2497 struct ieee80211_chanctx_conf *chanctx_conf;
2498 struct ieee80211_sub_if_data *ap_sdata;
2499 enum nl80211_band band;
2505 #ifdef CONFIG_MAC80211_DEBUGFS
2506 if (local->force_tx_status)
2507 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2510 /* convert Ethernet header to proper 802.11 header (based on
2511 * operation mode) */
2512 ethertype = (skb->data[12] << 8) | skb->data[13];
2513 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2515 switch (sdata->vif.type) {
2516 case NL80211_IFTYPE_AP_VLAN:
2517 if (sdata->wdev.use_4addr) {
2518 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2520 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2521 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2522 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2523 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2525 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2526 wme_sta = sta->sta.wme;
2528 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2530 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2531 if (!chanctx_conf) {
2535 band = chanctx_conf->def.chan->band;
2536 if (sdata->wdev.use_4addr)
2539 case NL80211_IFTYPE_AP:
2540 if (sdata->vif.type == NL80211_IFTYPE_AP)
2541 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2542 if (!chanctx_conf) {
2546 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2548 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2549 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2550 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2552 band = chanctx_conf->def.chan->band;
2554 case NL80211_IFTYPE_WDS:
2555 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2557 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2558 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2559 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2560 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2563 * This is the exception! WDS style interfaces are prohibited
2564 * when channel contexts are in used so this must be valid
2566 band = local->hw.conf.chandef.chan->band;
2568 #ifdef CONFIG_MAC80211_MESH
2569 case NL80211_IFTYPE_MESH_POINT:
2570 if (!is_multicast_ether_addr(skb->data)) {
2571 struct sta_info *next_hop;
2572 bool mpp_lookup = true;
2574 mpath = mesh_path_lookup(sdata, skb->data);
2577 next_hop = rcu_dereference(mpath->next_hop);
2579 !(mpath->flags & (MESH_PATH_ACTIVE |
2580 MESH_PATH_RESOLVING)))
2585 mppath = mpp_path_lookup(sdata, skb->data);
2587 mppath->exp_time = jiffies;
2590 if (mppath && mpath)
2591 mesh_path_del(sdata, mpath->dst);
2595 * Use address extension if it is a packet from
2596 * another interface or if we know the destination
2597 * is being proxied by a portal (i.e. portal address
2598 * differs from proxied address)
2600 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2601 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2602 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2603 skb->data, skb->data + ETH_ALEN);
2604 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2607 /* DS -> MBSS (802.11-2012 13.11.3.3).
2608 * For unicast with unknown forwarding information,
2609 * destination might be in the MBSS or if that fails
2610 * forwarded to another mesh gate. In either case
2611 * resolution will be handled in ieee80211_xmit(), so
2612 * leave the original DA. This also works for mcast */
2613 const u8 *mesh_da = skb->data;
2616 mesh_da = mppath->mpp;
2618 mesh_da = mpath->dst;
2620 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2621 mesh_da, sdata->vif.addr);
2622 if (is_multicast_ether_addr(mesh_da))
2623 /* DA TA mSA AE:SA */
2624 meshhdrlen = ieee80211_new_mesh_header(
2626 skb->data + ETH_ALEN, NULL);
2628 /* RA TA mDA mSA AE:DA SA */
2629 meshhdrlen = ieee80211_new_mesh_header(
2630 sdata, &mesh_hdr, skb->data,
2631 skb->data + ETH_ALEN);
2634 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2635 if (!chanctx_conf) {
2639 band = chanctx_conf->def.chan->band;
2641 /* For injected frames, fill RA right away as nexthop lookup
2644 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) &&
2645 is_zero_ether_addr(hdr.addr1))
2646 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2649 case NL80211_IFTYPE_STATION:
2650 /* we already did checks when looking up the RA STA */
2651 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2655 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2656 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2657 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2659 } else if (sdata->u.mgd.use_4addr &&
2660 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2661 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2662 IEEE80211_FCTL_TODS);
2664 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2665 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2666 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2667 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2670 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2672 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2673 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2674 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2677 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2678 if (!chanctx_conf) {
2682 band = chanctx_conf->def.chan->band;
2684 case NL80211_IFTYPE_OCB:
2686 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2687 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2688 eth_broadcast_addr(hdr.addr3);
2690 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2691 if (!chanctx_conf) {
2695 band = chanctx_conf->def.chan->band;
2697 case NL80211_IFTYPE_ADHOC:
2699 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2700 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2701 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2703 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2704 if (!chanctx_conf) {
2708 band = chanctx_conf->def.chan->band;
2715 multicast = is_multicast_ether_addr(hdr.addr1);
2717 /* sta is always NULL for mesh */
2719 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2720 wme_sta = sta->sta.wme;
2721 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2722 /* For mesh, the use of the QoS header is mandatory */
2726 /* receiver does QoS (which also means we do) use it */
2728 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2733 * Drop unicast frames to unauthorised stations unless they are
2734 * EAPOL frames from the local station.
2736 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2737 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2738 !multicast && !authorized &&
2739 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2740 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2741 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2742 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2743 sdata->name, hdr.addr1);
2746 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2752 if (unlikely(!multicast && skb->sk &&
2753 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS))
2754 info_id = ieee80211_store_ack_skb(local, skb, &info_flags);
2757 * If the skb is shared we need to obtain our own copy.
2759 if (skb_shared(skb)) {
2760 struct sk_buff *tmp_skb = skb;
2762 /* can't happen -- skb is a clone if info_id != 0 */
2765 skb = skb_clone(skb, GFP_ATOMIC);
2774 hdr.frame_control = fc;
2775 hdr.duration_id = 0;
2778 skip_header_bytes = ETH_HLEN;
2779 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2780 encaps_data = bridge_tunnel_header;
2781 encaps_len = sizeof(bridge_tunnel_header);
2782 skip_header_bytes -= 2;
2783 } else if (ethertype >= ETH_P_802_3_MIN) {
2784 encaps_data = rfc1042_header;
2785 encaps_len = sizeof(rfc1042_header);
2786 skip_header_bytes -= 2;
2792 skb_pull(skb, skip_header_bytes);
2793 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2796 * So we need to modify the skb header and hence need a copy of
2797 * that. The head_need variable above doesn't, so far, include
2798 * the needed header space that we don't need right away. If we
2799 * can, then we don't reallocate right now but only after the
2800 * frame arrives at the master device (if it does...)
2802 * If we cannot, however, then we will reallocate to include all
2803 * the ever needed space. Also, if we need to reallocate it anyway,
2804 * make it big enough for everything we may ever need.
2807 if (head_need > 0 || skb_cloned(skb)) {
2808 head_need += sdata->encrypt_headroom;
2809 head_need += local->tx_headroom;
2810 head_need = max_t(int, 0, head_need);
2811 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2812 ieee80211_free_txskb(&local->hw, skb);
2814 return ERR_PTR(-ENOMEM);
2819 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2821 #ifdef CONFIG_MAC80211_MESH
2823 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2826 if (ieee80211_is_data_qos(fc)) {
2827 __le16 *qos_control;
2829 qos_control = skb_push(skb, 2);
2830 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2832 * Maybe we could actually set some fields here, for now just
2833 * initialise to zero to indicate no special operation.
2837 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2839 skb_reset_mac_header(skb);
2841 info = IEEE80211_SKB_CB(skb);
2842 memset(info, 0, sizeof(*info));
2844 info->flags = info_flags;
2845 info->ack_frame_id = info_id;
2847 info->control.flags = ctrl_flags;
2852 return ERR_PTR(ret);
2856 * fast-xmit overview
2858 * The core idea of this fast-xmit is to remove per-packet checks by checking
2859 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2860 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2861 * much less work can be done per packet. For example, fragmentation must be
2862 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2865 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2866 * header and other data to aid packet processing in ieee80211_xmit_fast().
2868 * The most difficult part of this is that when any of these assumptions
2869 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2870 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2871 * since the per-packet code no longer checks the conditions. This is reflected
2872 * by the calls to these functions throughout the rest of the code, and must be
2873 * maintained if any of the TX path checks change.
2876 void ieee80211_check_fast_xmit(struct sta_info *sta)
2878 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2879 struct ieee80211_local *local = sta->local;
2880 struct ieee80211_sub_if_data *sdata = sta->sdata;
2881 struct ieee80211_hdr *hdr = (void *)build.hdr;
2882 struct ieee80211_chanctx_conf *chanctx_conf;
2885 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2888 /* Locking here protects both the pointer itself, and against concurrent
2889 * invocations winning data access races to, e.g., the key pointer that
2891 * Without it, the invocation of this function right after the key
2892 * pointer changes wouldn't be sufficient, as another CPU could access
2893 * the pointer, then stall, and then do the cache update after the CPU
2894 * that invalidated the key.
2895 * With the locking, such scenarios cannot happen as the check for the
2896 * key and the fast-tx assignment are done atomically, so the CPU that
2897 * modifies the key will either wait or other one will see the key
2898 * cleared/changed already.
2900 spin_lock_bh(&sta->lock);
2901 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2902 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2903 sdata->vif.type == NL80211_IFTYPE_STATION)
2906 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2909 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2910 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2911 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2912 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2915 if (sdata->noack_map)
2918 /* fast-xmit doesn't handle fragmentation at all */
2919 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2920 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2924 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2925 if (!chanctx_conf) {
2929 build.band = chanctx_conf->def.chan->band;
2932 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2934 switch (sdata->vif.type) {
2935 case NL80211_IFTYPE_ADHOC:
2937 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2938 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2939 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2942 case NL80211_IFTYPE_STATION:
2943 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2945 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2946 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2947 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2952 if (sdata->u.mgd.use_4addr) {
2953 /* non-regular ethertype cannot use the fastpath */
2954 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2955 IEEE80211_FCTL_TODS);
2957 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2958 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2959 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2960 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2964 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2966 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2967 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2968 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2971 case NL80211_IFTYPE_AP_VLAN:
2972 if (sdata->wdev.use_4addr) {
2973 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2974 IEEE80211_FCTL_TODS);
2976 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2977 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2978 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2979 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2984 case NL80211_IFTYPE_AP:
2985 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2987 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2988 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2989 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2993 /* not handled on fast-xmit */
2999 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
3002 /* We store the key here so there's no point in using rcu_dereference()
3003 * but that's fine because the code that changes the pointers will call
3004 * this function after doing so. For a single CPU that would be enough,
3005 * for multiple see the comment above.
3007 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
3009 build.key = rcu_access_pointer(sdata->default_unicast_key);
3011 bool gen_iv, iv_spc, mmic;
3013 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
3014 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
3015 mmic = build.key->conf.flags &
3016 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
3017 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
3019 /* don't handle software crypto */
3020 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
3023 /* Key is being removed */
3024 if (build.key->flags & KEY_FLAG_TAINTED)
3027 switch (build.key->conf.cipher) {
3028 case WLAN_CIPHER_SUITE_CCMP:
3029 case WLAN_CIPHER_SUITE_CCMP_256:
3031 build.pn_offs = build.hdr_len;
3032 if (gen_iv || iv_spc)
3033 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
3035 case WLAN_CIPHER_SUITE_GCMP:
3036 case WLAN_CIPHER_SUITE_GCMP_256:
3038 build.pn_offs = build.hdr_len;
3039 if (gen_iv || iv_spc)
3040 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3042 case WLAN_CIPHER_SUITE_TKIP:
3043 /* cannot handle MMIC or IV generation in xmit-fast */
3047 build.hdr_len += IEEE80211_TKIP_IV_LEN;
3049 case WLAN_CIPHER_SUITE_WEP40:
3050 case WLAN_CIPHER_SUITE_WEP104:
3051 /* cannot handle IV generation in fast-xmit */
3055 build.hdr_len += IEEE80211_WEP_IV_LEN;
3057 case WLAN_CIPHER_SUITE_AES_CMAC:
3058 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3059 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3060 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3062 "management cipher suite 0x%x enabled for data\n",
3063 build.key->conf.cipher);
3066 /* we don't know how to generate IVs for this at all */
3067 if (WARN_ON(gen_iv))
3069 /* pure hardware keys are OK, of course */
3070 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
3072 /* cipher scheme might require space allocation */
3074 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
3077 build.hdr_len += build.key->conf.iv_len;
3080 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3083 hdr->frame_control = fc;
3085 memcpy(build.hdr + build.hdr_len,
3086 rfc1042_header, sizeof(rfc1042_header));
3087 build.hdr_len += sizeof(rfc1042_header);
3089 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3090 /* if the kmemdup fails, continue w/o fast_tx */
3095 /* we might have raced against another call to this function */
3096 old = rcu_dereference_protected(sta->fast_tx,
3097 lockdep_is_held(&sta->lock));
3098 rcu_assign_pointer(sta->fast_tx, fast_tx);
3100 kfree_rcu(old, rcu_head);
3101 spin_unlock_bh(&sta->lock);
3104 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3106 struct sta_info *sta;
3109 list_for_each_entry_rcu(sta, &local->sta_list, list)
3110 ieee80211_check_fast_xmit(sta);
3114 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3116 struct ieee80211_local *local = sdata->local;
3117 struct sta_info *sta;
3121 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3122 if (sdata != sta->sdata &&
3123 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3125 ieee80211_check_fast_xmit(sta);
3131 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3133 struct ieee80211_fast_tx *fast_tx;
3135 spin_lock_bh(&sta->lock);
3136 fast_tx = rcu_dereference_protected(sta->fast_tx,
3137 lockdep_is_held(&sta->lock));
3138 RCU_INIT_POINTER(sta->fast_tx, NULL);
3139 spin_unlock_bh(&sta->lock);
3142 kfree_rcu(fast_tx, rcu_head);
3145 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3146 struct sk_buff *skb, int headroom)
3148 if (skb_headroom(skb) < headroom) {
3149 I802_DEBUG_INC(local->tx_expand_skb_head);
3151 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3152 wiphy_debug(local->hw.wiphy,
3153 "failed to reallocate TX buffer\n");
3161 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3162 struct ieee80211_fast_tx *fast_tx,
3163 struct sk_buff *skb)
3165 struct ieee80211_local *local = sdata->local;
3166 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3167 struct ieee80211_hdr *hdr;
3168 struct ethhdr *amsdu_hdr;
3169 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3170 int subframe_len = skb->len - hdr_len;
3172 u8 *qc, *h_80211_src, *h_80211_dst;
3175 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3178 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3181 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr)))
3184 data = skb_push(skb, sizeof(*amsdu_hdr));
3185 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3187 amsdu_hdr = data + hdr_len;
3188 /* h_80211_src/dst is addr* field within hdr */
3189 h_80211_src = data + fast_tx->sa_offs;
3190 h_80211_dst = data + fast_tx->da_offs;
3192 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3193 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3194 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3196 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3197 * fields needs to be changed to BSSID for A-MSDU frames depending
3198 * on FromDS/ToDS values.
3200 switch (sdata->vif.type) {
3201 case NL80211_IFTYPE_STATION:
3202 bssid = sdata->u.mgd.bssid;
3204 case NL80211_IFTYPE_AP:
3205 case NL80211_IFTYPE_AP_VLAN:
3206 bssid = sdata->vif.addr;
3212 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3213 ether_addr_copy(h_80211_src, bssid);
3215 if (bssid && ieee80211_has_tods(hdr->frame_control))
3216 ether_addr_copy(h_80211_dst, bssid);
3218 qc = ieee80211_get_qos_ctl(hdr);
3219 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3221 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3226 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3227 struct sta_info *sta,
3228 struct ieee80211_fast_tx *fast_tx,
3229 struct sk_buff *skb)
3231 struct ieee80211_local *local = sdata->local;
3232 struct fq *fq = &local->fq;
3234 struct fq_flow *flow;
3235 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3236 struct ieee80211_txq *txq = sta->sta.txq[tid];
3237 struct txq_info *txqi;
3238 struct sk_buff **frag_tail, *head;
3239 int subframe_len = skb->len - ETH_ALEN;
3240 u8 max_subframes = sta->sta.max_amsdu_subframes;
3241 int max_frags = local->hw.max_tx_fragments;
3242 int max_amsdu_len = sta->sta.max_amsdu_len;
3248 unsigned int orig_len;
3249 int n = 2, nfrags, pad = 0;
3252 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3255 if (skb_is_gso(skb))
3261 txqi = to_txq_info(txq);
3262 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3265 if (sta->sta.max_rc_amsdu_len)
3266 max_amsdu_len = min_t(int, max_amsdu_len,
3267 sta->sta.max_rc_amsdu_len);
3269 if (sta->sta.max_tid_amsdu_len[tid])
3270 max_amsdu_len = min_t(int, max_amsdu_len,
3271 sta->sta.max_tid_amsdu_len[tid]);
3273 flow_idx = fq_flow_idx(fq, skb);
3275 spin_lock_bh(&fq->lock);
3277 /* TODO: Ideally aggregation should be done on dequeue to remain
3278 * responsive to environment changes.
3282 flow = fq_flow_classify(fq, tin, flow_idx, skb,
3283 fq_flow_get_default_func);
3284 head = skb_peek_tail(&flow->queue);
3285 if (!head || skb_is_gso(head))
3288 orig_truesize = head->truesize;
3289 orig_len = head->len;
3291 if (skb->len + head->len > max_amsdu_len)
3294 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3295 nfrags += 1 + skb_shinfo(head)->nr_frags;
3296 frag_tail = &skb_shinfo(head)->frag_list;
3297 while (*frag_tail) {
3298 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3299 frag_tail = &(*frag_tail)->next;
3303 if (max_subframes && n > max_subframes)
3306 if (max_frags && nfrags > max_frags)
3309 if (!drv_can_aggregate_in_amsdu(local, head, skb))
3312 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3316 * Pad out the previous subframe to a multiple of 4 by adding the
3317 * padding to the next one, that's being added. Note that head->len
3318 * is the length of the full A-MSDU, but that works since each time
3319 * we add a new subframe we pad out the previous one to a multiple
3320 * of 4 and thus it no longer matters in the next round.
3322 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3323 if ((head->len - hdrlen) & 3)
3324 pad = 4 - ((head->len - hdrlen) & 3);
3326 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3331 data = skb_push(skb, ETH_ALEN + 2);
3332 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3334 data += 2 * ETH_ALEN;
3335 len = cpu_to_be16(subframe_len);
3336 memcpy(data, &len, 2);
3337 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3339 memset(skb_push(skb, pad), 0, pad);
3341 head->len += skb->len;
3342 head->data_len += skb->len;
3346 fq->memory_usage += head->truesize - orig_truesize;
3347 if (head->len != orig_len) {
3348 flow->backlog += head->len - orig_len;
3349 tin->backlog_bytes += head->len - orig_len;
3351 fq_recalc_backlog(fq, tin, flow);
3354 spin_unlock_bh(&fq->lock);
3360 * Can be called while the sta lock is held. Anything that can cause packets to
3361 * be generated will cause deadlock!
3363 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3364 struct sta_info *sta, u8 pn_offs,
3365 struct ieee80211_key *key,
3366 struct sk_buff *skb)
3368 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3369 struct ieee80211_hdr *hdr = (void *)skb->data;
3370 u8 tid = IEEE80211_NUM_TIDS;
3373 info->control.hw_key = &key->conf;
3375 ieee80211_tx_stats(skb->dev, skb->len);
3377 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3378 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3379 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3381 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3382 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3383 sdata->sequence_number += 0x10;
3386 if (skb_shinfo(skb)->gso_size)
3387 sta->tx_stats.msdu[tid] +=
3388 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3390 sta->tx_stats.msdu[tid]++;
3392 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3394 /* statistics normally done by ieee80211_tx_h_stats (but that
3395 * has to consider fragmentation, so is more complex)
3397 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3398 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3402 u8 *crypto_hdr = skb->data + pn_offs;
3404 switch (key->conf.cipher) {
3405 case WLAN_CIPHER_SUITE_CCMP:
3406 case WLAN_CIPHER_SUITE_CCMP_256:
3407 case WLAN_CIPHER_SUITE_GCMP:
3408 case WLAN_CIPHER_SUITE_GCMP_256:
3409 pn = atomic64_inc_return(&key->conf.tx_pn);
3411 crypto_hdr[1] = pn >> 8;
3412 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6);
3413 crypto_hdr[4] = pn >> 16;
3414 crypto_hdr[5] = pn >> 24;
3415 crypto_hdr[6] = pn >> 32;
3416 crypto_hdr[7] = pn >> 40;
3422 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3423 struct sta_info *sta,
3424 struct ieee80211_fast_tx *fast_tx,
3425 struct sk_buff *skb)
3427 struct ieee80211_local *local = sdata->local;
3428 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3429 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3430 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3432 struct ieee80211_tx_info *info;
3433 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3434 struct ieee80211_tx_data tx;
3435 ieee80211_tx_result r;
3436 struct tid_ampdu_tx *tid_tx = NULL;
3437 u8 tid = IEEE80211_NUM_TIDS;
3439 /* control port protocol needs a lot of special handling */
3440 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3443 /* only RFC 1042 SNAP */
3444 if (ethertype < ETH_P_802_3_MIN)
3447 /* don't handle TX status request here either */
3448 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3451 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3452 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3453 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3455 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3457 if (tid_tx->timeout)
3458 tid_tx->last_tx = jiffies;
3462 /* after this point (skb is modified) we cannot return false */
3464 if (skb_shared(skb)) {
3465 struct sk_buff *tmp_skb = skb;
3467 skb = skb_clone(skb, GFP_ATOMIC);
3474 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3475 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3478 /* will not be crypto-handled beyond what we do here, so use false
3479 * as the may-encrypt argument for the resize to not account for
3480 * more room than we already have in 'extra_head'
3482 if (unlikely(ieee80211_skb_resize(sdata, skb,
3483 max_t(int, extra_head + hw_headroom -
3484 skb_headroom(skb), 0),
3490 memcpy(ð, skb->data, ETH_HLEN - 2);
3491 hdr = skb_push(skb, extra_head);
3492 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3493 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3494 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3496 info = IEEE80211_SKB_CB(skb);
3497 memset(info, 0, sizeof(*info));
3498 info->band = fast_tx->band;
3499 info->control.vif = &sdata->vif;
3500 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3501 IEEE80211_TX_CTL_DONTFRAG |
3502 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3503 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3505 #ifdef CONFIG_MAC80211_DEBUGFS
3506 if (local->force_tx_status)
3507 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
3510 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3511 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3512 *ieee80211_get_qos_ctl(hdr) = tid;
3515 __skb_queue_head_init(&tx.skbs);
3517 tx.flags = IEEE80211_TX_UNICAST;
3521 tx.key = fast_tx->key;
3523 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3525 r = ieee80211_tx_h_rate_ctrl(&tx);
3529 if (r != TX_CONTINUE) {
3536 if (ieee80211_queue_skb(local, sdata, sta, skb))
3539 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3542 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3543 sdata = container_of(sdata->bss,
3544 struct ieee80211_sub_if_data, u.ap);
3546 __skb_queue_tail(&tx.skbs, skb);
3547 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false);
3551 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3552 struct ieee80211_txq *txq)
3554 struct ieee80211_local *local = hw_to_local(hw);
3555 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3556 struct ieee80211_hdr *hdr;
3557 struct sk_buff *skb = NULL;
3558 struct fq *fq = &local->fq;
3559 struct fq_tin *tin = &txqi->tin;
3560 struct ieee80211_tx_info *info;
3561 struct ieee80211_tx_data tx;
3562 ieee80211_tx_result r;
3563 struct ieee80211_vif *vif = txq->vif;
3565 WARN_ON_ONCE(softirq_count() == 0);
3567 if (!ieee80211_txq_airtime_check(hw, txq))
3571 spin_lock_bh(&fq->lock);
3573 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ||
3574 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags))
3577 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) {
3578 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags);
3582 /* Make sure fragments stay together. */
3583 skb = __skb_dequeue(&txqi->frags);
3587 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3591 spin_unlock_bh(&fq->lock);
3593 hdr = (struct ieee80211_hdr *)skb->data;
3594 info = IEEE80211_SKB_CB(skb);
3596 memset(&tx, 0, sizeof(tx));
3597 __skb_queue_head_init(&tx.skbs);
3600 tx.sdata = vif_to_sdata(info->control.vif);
3603 tx.sta = container_of(txq->sta, struct sta_info, sta);
3606 * The key can be removed while the packet was queued, so need to call
3607 * this here to get the current key.
3609 r = ieee80211_tx_h_select_key(&tx);
3610 if (r != TX_CONTINUE) {
3611 ieee80211_free_txskb(&local->hw, skb);
3615 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3616 info->flags |= IEEE80211_TX_CTL_AMPDU;
3618 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3620 if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP)
3623 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3624 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3629 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3630 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3632 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3635 if (invoke_tx_handlers_late(&tx))
3638 skb = __skb_dequeue(&tx.skbs);
3640 if (!skb_queue_empty(&tx.skbs)) {
3641 spin_lock_bh(&fq->lock);
3642 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3643 spin_unlock_bh(&fq->lock);
3647 if (skb_has_frag_list(skb) &&
3648 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3649 if (skb_linearize(skb)) {
3650 ieee80211_free_txskb(&local->hw, skb);
3655 switch (tx.sdata->vif.type) {
3656 case NL80211_IFTYPE_MONITOR:
3657 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3658 vif = &tx.sdata->vif;
3661 tx.sdata = rcu_dereference(local->monitor_sdata);
3663 vif = &tx.sdata->vif;
3665 vif->hw_queue[skb_get_queue_mapping(skb)];
3666 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3667 ieee80211_free_txskb(&local->hw, skb);
3673 case NL80211_IFTYPE_AP_VLAN:
3674 tx.sdata = container_of(tx.sdata->bss,
3675 struct ieee80211_sub_if_data, u.ap);
3678 vif = &tx.sdata->vif;
3683 IEEE80211_SKB_CB(skb)->control.vif = vif;
3686 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) {
3689 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta,
3692 airtime = ieee80211_info_set_tx_time_est(info, airtime);
3693 ieee80211_sta_update_pending_airtime(local, tx.sta,
3703 spin_unlock_bh(&fq->lock);
3707 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3709 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
3711 struct ieee80211_local *local = hw_to_local(hw);
3712 struct ieee80211_txq *ret = NULL;
3713 struct txq_info *txqi = NULL, *head = NULL;
3714 bool found_eligible_txq = false;
3716 spin_lock_bh(&local->active_txq_lock[ac]);
3719 txqi = list_first_entry_or_null(&local->active_txqs[ac],
3726 if (!found_eligible_txq)
3729 found_eligible_txq = false;
3735 if (txqi->txq.sta) {
3736 struct sta_info *sta = container_of(txqi->txq.sta,
3737 struct sta_info, sta);
3738 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq);
3739 s64 deficit = sta->airtime[txqi->txq.ac].deficit;
3742 found_eligible_txq = true;
3745 sta->airtime[txqi->txq.ac].deficit +=
3746 sta->airtime_weight;
3748 if (deficit < 0 || !aql_check) {
3749 list_move_tail(&txqi->schedule_order,
3750 &local->active_txqs[txqi->txq.ac]);
3756 if (txqi->schedule_round == local->schedule_round[ac])
3759 list_del_init(&txqi->schedule_order);
3760 txqi->schedule_round = local->schedule_round[ac];
3764 spin_unlock_bh(&local->active_txq_lock[ac]);
3767 EXPORT_SYMBOL(ieee80211_next_txq);
3769 void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
3770 struct ieee80211_txq *txq,
3773 struct ieee80211_local *local = hw_to_local(hw);
3774 struct txq_info *txqi = to_txq_info(txq);
3776 spin_lock_bh(&local->active_txq_lock[txq->ac]);
3778 if (list_empty(&txqi->schedule_order) &&
3779 (force || !skb_queue_empty(&txqi->frags) ||
3780 txqi->tin.backlog_packets)) {
3781 /* If airtime accounting is active, always enqueue STAs at the
3782 * head of the list to ensure that they only get moved to the
3783 * back by the airtime DRR scheduler once they have a negative
3784 * deficit. A station that already has a negative deficit will
3785 * get immediately moved to the back of the list on the next
3786 * call to ieee80211_next_txq().
3788 if (txqi->txq.sta &&
3789 wiphy_ext_feature_isset(local->hw.wiphy,
3790 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
3791 list_add(&txqi->schedule_order,
3792 &local->active_txqs[txq->ac]);
3794 list_add_tail(&txqi->schedule_order,
3795 &local->active_txqs[txq->ac]);
3798 spin_unlock_bh(&local->active_txq_lock[txq->ac]);
3800 EXPORT_SYMBOL(__ieee80211_schedule_txq);
3802 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw,
3803 struct ieee80211_txq *txq)
3805 struct sta_info *sta;
3806 struct ieee80211_local *local = hw_to_local(hw);
3808 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
3814 sta = container_of(txq->sta, struct sta_info, sta);
3815 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
3816 sta->airtime[txq->ac].aql_limit_low)
3819 if (atomic_read(&local->aql_total_pending_airtime) <
3820 local->aql_threshold &&
3821 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
3822 sta->airtime[txq->ac].aql_limit_high)
3827 EXPORT_SYMBOL(ieee80211_txq_airtime_check);
3829 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw,
3830 struct ieee80211_txq *txq)
3832 struct ieee80211_local *local = hw_to_local(hw);
3833 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq);
3834 struct sta_info *sta;
3837 spin_lock_bh(&local->active_txq_lock[ac]);
3842 if (list_empty(&txqi->schedule_order))
3845 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac],
3850 if (!iter->txq.sta) {
3851 list_move_tail(&iter->schedule_order,
3852 &local->active_txqs[ac]);
3855 sta = container_of(iter->txq.sta, struct sta_info, sta);
3856 if (sta->airtime[ac].deficit < 0)
3857 sta->airtime[ac].deficit += sta->airtime_weight;
3858 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]);
3861 sta = container_of(txqi->txq.sta, struct sta_info, sta);
3862 if (sta->airtime[ac].deficit >= 0)
3865 sta->airtime[ac].deficit += sta->airtime_weight;
3866 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]);
3867 spin_unlock_bh(&local->active_txq_lock[ac]);
3871 if (!list_empty(&txqi->schedule_order))
3872 list_del_init(&txqi->schedule_order);
3873 spin_unlock_bh(&local->active_txq_lock[ac]);
3877 EXPORT_SYMBOL(ieee80211_txq_may_transmit);
3879 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac)
3881 struct ieee80211_local *local = hw_to_local(hw);
3883 spin_lock_bh(&local->active_txq_lock[ac]);
3884 local->schedule_round[ac]++;
3885 spin_unlock_bh(&local->active_txq_lock[ac]);
3887 EXPORT_SYMBOL(ieee80211_txq_schedule_start);
3889 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3890 struct net_device *dev,
3894 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3895 struct ieee80211_local *local = sdata->local;
3896 struct sta_info *sta;
3897 struct sk_buff *next;
3899 if (unlikely(skb->len < ETH_HLEN)) {
3906 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3912 if (local->ops->wake_tx_queue) {
3913 u16 queue = __ieee80211_select_queue(sdata, sta, skb);
3914 skb_set_queue_mapping(skb, queue);
3918 struct ieee80211_fast_tx *fast_tx;
3920 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
3922 fast_tx = rcu_dereference(sta->fast_tx);
3925 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3929 if (skb_is_gso(skb)) {
3930 struct sk_buff *segs;
3932 segs = skb_gso_segment(skb, 0);
3940 /* we cannot process non-linear frames on this path */
3941 if (skb_linearize(skb)) {
3946 /* the frame could be fragmented, software-encrypted, and other
3947 * things so we cannot really handle checksum offload with it -
3948 * fix it up in software before we handle anything else.
3950 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3951 skb_set_transport_header(skb,
3952 skb_checksum_start_offset(skb));
3953 if (skb_checksum_help(skb))
3958 skb_list_walk_safe(skb, skb, next) {
3959 skb_mark_not_on_list(skb);
3961 skb = ieee80211_build_hdr(sdata, skb, info_flags,
3964 kfree_skb_list(next);
3968 ieee80211_tx_stats(dev, skb->len);
3970 ieee80211_xmit(sdata, sta, skb, 0);
3979 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3984 err = skb_ensure_writable(skb, ETH_HLEN);
3988 eth = (void *)skb->data;
3989 ether_addr_copy(eth->h_dest, sta->sta.addr);
3994 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3995 struct net_device *dev)
3997 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3998 const struct ethhdr *eth = (void *)skb->data;
3999 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
4002 if (likely(!is_multicast_ether_addr(eth->h_dest)))
4005 switch (sdata->vif.type) {
4006 case NL80211_IFTYPE_AP_VLAN:
4007 if (sdata->u.vlan.sta)
4009 if (sdata->wdev.use_4addr)
4012 case NL80211_IFTYPE_AP:
4013 /* check runtime toggle for this bss */
4014 if (!sdata->bss->multicast_to_unicast)
4021 /* multicast to unicast conversion only for some payload */
4022 ethertype = eth->h_proto;
4023 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
4024 ethertype = ethvlan->h_vlan_encapsulated_proto;
4025 switch (ethertype) {
4026 case htons(ETH_P_ARP):
4027 case htons(ETH_P_IP):
4028 case htons(ETH_P_IPV6):
4038 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
4039 struct sk_buff_head *queue)
4041 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4042 struct ieee80211_local *local = sdata->local;
4043 const struct ethhdr *eth = (struct ethhdr *)skb->data;
4044 struct sta_info *sta, *first = NULL;
4045 struct sk_buff *cloned_skb;
4049 list_for_each_entry_rcu(sta, &local->sta_list, list) {
4050 if (sdata != sta->sdata)
4051 /* AP-VLAN mismatch */
4053 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
4054 /* do not send back to source */
4060 cloned_skb = skb_clone(skb, GFP_ATOMIC);
4063 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
4064 dev_kfree_skb(cloned_skb);
4067 __skb_queue_tail(queue, cloned_skb);
4070 if (likely(first)) {
4071 if (unlikely(ieee80211_change_da(skb, first)))
4073 __skb_queue_tail(queue, skb);
4075 /* no STA connected, drop */
4082 __skb_queue_purge(queue);
4083 __skb_queue_tail(queue, skb);
4089 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
4090 * @skb: packet to be sent
4091 * @dev: incoming interface
4093 * On failure skb will be freed.
4095 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
4096 struct net_device *dev)
4098 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
4099 struct sk_buff_head queue;
4101 __skb_queue_head_init(&queue);
4102 ieee80211_convert_to_unicast(skb, dev, &queue);
4103 while ((skb = __skb_dequeue(&queue)))
4104 __ieee80211_subif_start_xmit(skb, dev, 0, 0);
4106 __ieee80211_subif_start_xmit(skb, dev, 0, 0);
4109 return NETDEV_TX_OK;
4112 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
4113 struct sk_buff *skb, int led_len,
4114 struct sta_info *sta,
4117 struct ieee80211_local *local = sdata->local;
4118 struct ieee80211_tx_control control = {};
4119 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4120 struct ieee80211_sta *pubsta = NULL;
4121 unsigned long flags;
4122 int q = info->hw_queue;
4124 if (ieee80211_queue_skb(local, sdata, sta, skb))
4127 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4129 if (local->queue_stop_reasons[q] ||
4130 (!txpending && !skb_queue_empty(&local->pending[q]))) {
4132 skb_queue_head(&local->pending[q], skb);
4134 skb_queue_tail(&local->pending[q], skb);
4136 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4141 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4143 if (sta && sta->uploaded)
4146 control.sta = pubsta;
4148 drv_tx(local, &control, skb);
4153 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
4154 struct net_device *dev, struct sta_info *sta,
4155 struct sk_buff *skb)
4157 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4158 struct ethhdr *ehdr = (struct ethhdr *)skb->data;
4159 struct ieee80211_local *local = sdata->local;
4160 bool authorized = false;
4162 unsigned char *ra = ehdr->h_dest;
4164 if (IS_ERR(sta) || (sta && !sta->uploaded))
4167 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
4168 (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER)))
4169 ra = sdata->u.mgd.bssid;
4171 if (!is_valid_ether_addr(ra))
4174 multicast = is_multicast_ether_addr(ra);
4177 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
4179 if (!multicast && !authorized &&
4180 (ehdr->h_proto != sdata->control_port_protocol ||
4181 !ether_addr_equal(sdata->vif.addr, ehdr->h_source)))
4184 if (multicast && sdata->vif.type == NL80211_IFTYPE_AP &&
4185 !atomic_read(&sdata->u.ap.num_mcast_sta))
4188 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) &&
4189 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
4192 if (unlikely(!multicast && skb->sk &&
4193 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS))
4194 ieee80211_store_ack_skb(local, skb, &info->flags);
4196 memset(info, 0, sizeof(*info));
4198 if (unlikely(sdata->control_port_protocol == ehdr->h_proto)) {
4199 if (sdata->control_port_no_encrypt)
4200 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4201 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
4205 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4207 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
4209 ieee80211_tx_stats(dev, skb->len);
4212 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
4213 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
4216 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
4217 sdata = container_of(sdata->bss,
4218 struct ieee80211_sub_if_data, u.ap);
4220 info->control.flags |= IEEE80211_TX_CTRL_HW_80211_ENCAP;
4221 info->control.vif = &sdata->vif;
4223 ieee80211_tx_8023(sdata, skb, skb->len, sta, false);
4231 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
4232 struct net_device *dev)
4234 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4235 struct sta_info *sta;
4237 if (WARN_ON(!sdata->hw_80211_encap)) {
4239 return NETDEV_TX_OK;
4242 if (unlikely(skb->len < ETH_HLEN)) {
4244 return NETDEV_TX_OK;
4249 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
4252 ieee80211_8023_xmit(sdata, dev, sta, skb);
4256 return NETDEV_TX_OK;
4260 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
4261 struct sk_buff *skb, u32 info_flags)
4263 struct ieee80211_hdr *hdr;
4264 struct ieee80211_tx_data tx = {
4265 .local = sdata->local,
4268 struct sta_info *sta;
4272 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4274 skb = ERR_PTR(-EINVAL);
4278 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0);
4282 hdr = (void *)skb->data;
4283 tx.sta = sta_info_get(sdata, hdr->addr1);
4286 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
4289 return ERR_PTR(-EINVAL);
4298 * ieee80211_clear_tx_pending may not be called in a context where
4299 * it is possible that it packets could come in again.
4301 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
4303 struct sk_buff *skb;
4306 for (i = 0; i < local->hw.queues; i++) {
4307 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
4308 ieee80211_free_txskb(&local->hw, skb);
4313 * Returns false if the frame couldn't be transmitted but was queued instead,
4314 * which in this case means re-queued -- take as an indication to stop sending
4315 * more pending frames.
4317 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
4318 struct sk_buff *skb)
4320 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4321 struct ieee80211_sub_if_data *sdata;
4322 struct sta_info *sta;
4323 struct ieee80211_hdr *hdr;
4325 struct ieee80211_chanctx_conf *chanctx_conf;
4327 sdata = vif_to_sdata(info->control.vif);
4329 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
4330 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4331 if (unlikely(!chanctx_conf)) {
4335 info->band = chanctx_conf->def.chan->band;
4336 result = ieee80211_tx(sdata, NULL, skb, true, 0);
4337 } else if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) {
4338 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4343 if (IS_ERR(sta) || (sta && !sta->uploaded))
4346 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true);
4348 struct sk_buff_head skbs;
4350 __skb_queue_head_init(&skbs);
4351 __skb_queue_tail(&skbs, skb);
4353 hdr = (struct ieee80211_hdr *)skb->data;
4354 sta = sta_info_get(sdata, hdr->addr1);
4356 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
4363 * Transmit all pending packets. Called from tasklet.
4365 void ieee80211_tx_pending(unsigned long data)
4367 struct ieee80211_local *local = (struct ieee80211_local *)data;
4368 unsigned long flags;
4374 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4375 for (i = 0; i < local->hw.queues; i++) {
4377 * If queue is stopped by something other than due to pending
4378 * frames, or we have no pending frames, proceed to next queue.
4380 if (local->queue_stop_reasons[i] ||
4381 skb_queue_empty(&local->pending[i]))
4384 while (!skb_queue_empty(&local->pending[i])) {
4385 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
4386 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4388 if (WARN_ON(!info->control.vif)) {
4389 ieee80211_free_txskb(&local->hw, skb);
4393 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
4396 txok = ieee80211_tx_pending_skb(local, skb);
4397 spin_lock_irqsave(&local->queue_stop_reason_lock,
4403 if (skb_queue_empty(&local->pending[i]))
4404 ieee80211_propagate_queue_wake(local, i);
4406 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4411 /* functions for drivers to get certain frames */
4413 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4414 struct ps_data *ps, struct sk_buff *skb,
4419 int i, have_bits = 0, n1, n2;
4421 /* Generate bitmap for TIM only if there are any STAs in power save
4423 if (atomic_read(&ps->num_sta_ps) > 0)
4424 /* in the hope that this is faster than
4425 * checking byte-for-byte */
4426 have_bits = !bitmap_empty((unsigned long *)ps->tim,
4427 IEEE80211_MAX_AID+1);
4429 if (ps->dtim_count == 0)
4430 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
4435 tim = pos = skb_put(skb, 6);
4436 *pos++ = WLAN_EID_TIM;
4438 *pos++ = ps->dtim_count;
4439 *pos++ = sdata->vif.bss_conf.dtim_period;
4441 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
4444 ps->dtim_bc_mc = aid0 == 1;
4447 /* Find largest even number N1 so that bits numbered 1 through
4448 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4449 * (N2 + 1) x 8 through 2007 are 0. */
4451 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4458 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4465 /* Bitmap control */
4467 /* Part Virt Bitmap */
4468 skb_put(skb, n2 - n1);
4469 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
4471 tim[1] = n2 - n1 + 4;
4473 *pos++ = aid0; /* Bitmap control */
4474 *pos++ = 0; /* Part Virt Bitmap */
4478 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4479 struct ps_data *ps, struct sk_buff *skb,
4482 struct ieee80211_local *local = sdata->local;
4485 * Not very nice, but we want to allow the driver to call
4486 * ieee80211_beacon_get() as a response to the set_tim()
4487 * callback. That, however, is already invoked under the
4488 * sta_lock to guarantee consistent and race-free update
4489 * of the tim bitmap in mac80211 and the driver.
4491 if (local->tim_in_locked_section) {
4492 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4494 spin_lock_bh(&local->tim_lock);
4495 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4496 spin_unlock_bh(&local->tim_lock);
4502 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
4503 struct beacon_data *beacon)
4505 struct probe_resp *resp;
4507 size_t beacon_data_len;
4509 u8 count = beacon->csa_current_counter;
4511 switch (sdata->vif.type) {
4512 case NL80211_IFTYPE_AP:
4513 beacon_data = beacon->tail;
4514 beacon_data_len = beacon->tail_len;
4516 case NL80211_IFTYPE_ADHOC:
4517 beacon_data = beacon->head;
4518 beacon_data_len = beacon->head_len;
4520 case NL80211_IFTYPE_MESH_POINT:
4521 beacon_data = beacon->head;
4522 beacon_data_len = beacon->head_len;
4529 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
4530 resp = rcu_dereference(sdata->u.ap.probe_resp);
4532 if (beacon->csa_counter_offsets[i]) {
4533 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
4539 beacon_data[beacon->csa_counter_offsets[i]] = count;
4542 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
4543 resp->data[resp->csa_counter_offsets[i]] = count;
4548 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
4550 beacon->csa_current_counter--;
4552 /* the counter should never reach 0 */
4553 WARN_ON_ONCE(!beacon->csa_current_counter);
4555 return beacon->csa_current_counter;
4558 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4560 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4561 struct beacon_data *beacon = NULL;
4566 if (sdata->vif.type == NL80211_IFTYPE_AP)
4567 beacon = rcu_dereference(sdata->u.ap.beacon);
4568 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4569 beacon = rcu_dereference(sdata->u.ibss.presp);
4570 else if (ieee80211_vif_is_mesh(&sdata->vif))
4571 beacon = rcu_dereference(sdata->u.mesh.beacon);
4576 count = __ieee80211_csa_update_counter(beacon);
4582 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4584 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter)
4586 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4587 struct beacon_data *beacon = NULL;
4591 if (sdata->vif.type == NL80211_IFTYPE_AP)
4592 beacon = rcu_dereference(sdata->u.ap.beacon);
4593 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4594 beacon = rcu_dereference(sdata->u.ibss.presp);
4595 else if (ieee80211_vif_is_mesh(&sdata->vif))
4596 beacon = rcu_dereference(sdata->u.mesh.beacon);
4601 if (counter < beacon->csa_current_counter)
4602 beacon->csa_current_counter = counter;
4607 EXPORT_SYMBOL(ieee80211_csa_set_counter);
4609 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4611 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4612 struct beacon_data *beacon = NULL;
4614 size_t beacon_data_len;
4617 if (!ieee80211_sdata_running(sdata))
4621 if (vif->type == NL80211_IFTYPE_AP) {
4622 struct ieee80211_if_ap *ap = &sdata->u.ap;
4624 beacon = rcu_dereference(ap->beacon);
4625 if (WARN_ON(!beacon || !beacon->tail))
4627 beacon_data = beacon->tail;
4628 beacon_data_len = beacon->tail_len;
4629 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4630 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4632 beacon = rcu_dereference(ifibss->presp);
4636 beacon_data = beacon->head;
4637 beacon_data_len = beacon->head_len;
4638 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4639 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4641 beacon = rcu_dereference(ifmsh->beacon);
4645 beacon_data = beacon->head;
4646 beacon_data_len = beacon->head_len;
4652 if (!beacon->csa_counter_offsets[0])
4655 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4658 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4665 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4667 static int ieee80211_beacon_protect(struct sk_buff *skb,
4668 struct ieee80211_local *local,
4669 struct ieee80211_sub_if_data *sdata)
4671 ieee80211_tx_result res;
4672 struct ieee80211_tx_data tx;
4674 memset(&tx, 0, sizeof(tx));
4675 tx.key = rcu_dereference(sdata->default_beacon_key);
4680 __skb_queue_head_init(&tx.skbs);
4681 __skb_queue_tail(&tx.skbs, skb);
4682 res = ieee80211_tx_h_encrypt(&tx);
4683 if (WARN_ON_ONCE(res != TX_CONTINUE))
4689 static struct sk_buff *
4690 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4691 struct ieee80211_vif *vif,
4692 struct ieee80211_mutable_offsets *offs,
4695 struct ieee80211_local *local = hw_to_local(hw);
4696 struct beacon_data *beacon = NULL;
4697 struct sk_buff *skb = NULL;
4698 struct ieee80211_tx_info *info;
4699 struct ieee80211_sub_if_data *sdata = NULL;
4700 enum nl80211_band band;
4701 struct ieee80211_tx_rate_control txrc;
4702 struct ieee80211_chanctx_conf *chanctx_conf;
4703 int csa_off_base = 0;
4707 sdata = vif_to_sdata(vif);
4708 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4710 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4714 memset(offs, 0, sizeof(*offs));
4716 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4717 struct ieee80211_if_ap *ap = &sdata->u.ap;
4719 beacon = rcu_dereference(ap->beacon);
4721 if (beacon->csa_counter_offsets[0]) {
4723 __ieee80211_csa_update_counter(beacon);
4725 ieee80211_set_csa(sdata, beacon);
4729 * headroom, head length,
4730 * tail length and maximum TIM length
4732 skb = dev_alloc_skb(local->tx_headroom +
4734 beacon->tail_len + 256 +
4735 local->hw.extra_beacon_tailroom);
4739 skb_reserve(skb, local->tx_headroom);
4740 skb_put_data(skb, beacon->head, beacon->head_len);
4742 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4746 offs->tim_offset = beacon->head_len;
4747 offs->tim_length = skb->len - beacon->head_len;
4749 /* for AP the csa offsets are from tail */
4750 csa_off_base = skb->len;
4754 skb_put_data(skb, beacon->tail,
4757 if (ieee80211_beacon_protect(skb, local, sdata) < 0)
4761 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4762 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4763 struct ieee80211_hdr *hdr;
4765 beacon = rcu_dereference(ifibss->presp);
4769 if (beacon->csa_counter_offsets[0]) {
4771 __ieee80211_csa_update_counter(beacon);
4773 ieee80211_set_csa(sdata, beacon);
4776 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4777 local->hw.extra_beacon_tailroom);
4780 skb_reserve(skb, local->tx_headroom);
4781 skb_put_data(skb, beacon->head, beacon->head_len);
4783 hdr = (struct ieee80211_hdr *) skb->data;
4784 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4785 IEEE80211_STYPE_BEACON);
4786 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4787 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4789 beacon = rcu_dereference(ifmsh->beacon);
4793 if (beacon->csa_counter_offsets[0]) {
4795 /* TODO: For mesh csa_counter is in TU, so
4796 * decrementing it by one isn't correct, but
4797 * for now we leave it consistent with overall
4798 * mac80211's behavior.
4800 __ieee80211_csa_update_counter(beacon);
4802 ieee80211_set_csa(sdata, beacon);
4805 if (ifmsh->sync_ops)
4806 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4808 skb = dev_alloc_skb(local->tx_headroom +
4812 local->hw.extra_beacon_tailroom);
4815 skb_reserve(skb, local->tx_headroom);
4816 skb_put_data(skb, beacon->head, beacon->head_len);
4817 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4820 offs->tim_offset = beacon->head_len;
4821 offs->tim_length = skb->len - beacon->head_len;
4824 skb_put_data(skb, beacon->tail, beacon->tail_len);
4831 if (offs && beacon) {
4834 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4835 u16 csa_off = beacon->csa_counter_offsets[i];
4840 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4844 band = chanctx_conf->def.chan->band;
4846 info = IEEE80211_SKB_CB(skb);
4848 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4849 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4852 memset(&txrc, 0, sizeof(txrc));
4854 txrc.sband = local->hw.wiphy->bands[band];
4855 txrc.bss_conf = &sdata->vif.bss_conf;
4857 txrc.reported_rate.idx = -1;
4858 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4860 rate_control_get_rate(sdata, NULL, &txrc);
4862 info->control.vif = vif;
4864 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4865 IEEE80211_TX_CTL_ASSIGN_SEQ |
4866 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4874 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4875 struct ieee80211_vif *vif,
4876 struct ieee80211_mutable_offsets *offs)
4878 return __ieee80211_beacon_get(hw, vif, offs, true);
4880 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4882 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4883 struct ieee80211_vif *vif,
4884 u16 *tim_offset, u16 *tim_length)
4886 struct ieee80211_mutable_offsets offs = {};
4887 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4888 struct sk_buff *copy;
4889 struct ieee80211_supported_band *sband;
4896 *tim_offset = offs.tim_offset;
4899 *tim_length = offs.tim_length;
4901 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4902 !hw_to_local(hw)->monitors)
4905 /* send a copy to monitor interfaces */
4906 copy = skb_copy(bcn, GFP_ATOMIC);
4910 shift = ieee80211_vif_get_shift(vif);
4911 sband = ieee80211_get_sband(vif_to_sdata(vif));
4915 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false,
4920 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4922 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4923 struct ieee80211_vif *vif)
4925 struct ieee80211_if_ap *ap = NULL;
4926 struct sk_buff *skb = NULL;
4927 struct probe_resp *presp = NULL;
4928 struct ieee80211_hdr *hdr;
4929 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4931 if (sdata->vif.type != NL80211_IFTYPE_AP)
4937 presp = rcu_dereference(ap->probe_resp);
4941 skb = dev_alloc_skb(presp->len);
4945 skb_put_data(skb, presp->data, presp->len);
4947 hdr = (struct ieee80211_hdr *) skb->data;
4948 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4954 EXPORT_SYMBOL(ieee80211_proberesp_get);
4956 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4957 struct ieee80211_vif *vif)
4959 struct ieee80211_sub_if_data *sdata;
4960 struct ieee80211_if_managed *ifmgd;
4961 struct ieee80211_pspoll *pspoll;
4962 struct ieee80211_local *local;
4963 struct sk_buff *skb;
4965 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4968 sdata = vif_to_sdata(vif);
4969 ifmgd = &sdata->u.mgd;
4970 local = sdata->local;
4972 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4976 skb_reserve(skb, local->hw.extra_tx_headroom);
4978 pspoll = skb_put_zero(skb, sizeof(*pspoll));
4979 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4980 IEEE80211_STYPE_PSPOLL);
4981 pspoll->aid = cpu_to_le16(ifmgd->aid);
4983 /* aid in PS-Poll has its two MSBs each set to 1 */
4984 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4986 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4987 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4991 EXPORT_SYMBOL(ieee80211_pspoll_get);
4993 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4994 struct ieee80211_vif *vif,
4997 struct ieee80211_hdr_3addr *nullfunc;
4998 struct ieee80211_sub_if_data *sdata;
4999 struct ieee80211_if_managed *ifmgd;
5000 struct ieee80211_local *local;
5001 struct sk_buff *skb;
5004 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
5007 sdata = vif_to_sdata(vif);
5008 ifmgd = &sdata->u.mgd;
5009 local = sdata->local;
5012 struct sta_info *sta;
5015 sta = sta_info_get(sdata, ifmgd->bssid);
5016 qos = sta && sta->sta.wme;
5020 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
5021 sizeof(*nullfunc) + 2);
5025 skb_reserve(skb, local->hw.extra_tx_headroom);
5027 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
5028 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
5029 IEEE80211_STYPE_NULLFUNC |
5030 IEEE80211_FCTL_TODS);
5032 __le16 qoshdr = cpu_to_le16(7);
5034 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
5035 IEEE80211_STYPE_NULLFUNC) !=
5036 IEEE80211_STYPE_QOS_NULLFUNC);
5037 nullfunc->frame_control |=
5038 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
5040 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
5041 skb_put_data(skb, &qoshdr, sizeof(qoshdr));
5044 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
5045 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
5046 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
5050 EXPORT_SYMBOL(ieee80211_nullfunc_get);
5052 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
5054 const u8 *ssid, size_t ssid_len,
5057 struct ieee80211_local *local = hw_to_local(hw);
5058 struct ieee80211_hdr_3addr *hdr;
5059 struct sk_buff *skb;
5063 ie_ssid_len = 2 + ssid_len;
5065 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
5066 ie_ssid_len + tailroom);
5070 skb_reserve(skb, local->hw.extra_tx_headroom);
5072 hdr = skb_put_zero(skb, sizeof(*hdr));
5073 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
5074 IEEE80211_STYPE_PROBE_REQ);
5075 eth_broadcast_addr(hdr->addr1);
5076 memcpy(hdr->addr2, src_addr, ETH_ALEN);
5077 eth_broadcast_addr(hdr->addr3);
5079 pos = skb_put(skb, ie_ssid_len);
5080 *pos++ = WLAN_EID_SSID;
5083 memcpy(pos, ssid, ssid_len);
5088 EXPORT_SYMBOL(ieee80211_probereq_get);
5090 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5091 const void *frame, size_t frame_len,
5092 const struct ieee80211_tx_info *frame_txctl,
5093 struct ieee80211_rts *rts)
5095 const struct ieee80211_hdr *hdr = frame;
5097 rts->frame_control =
5098 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
5099 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
5101 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
5102 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
5104 EXPORT_SYMBOL(ieee80211_rts_get);
5106 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
5107 const void *frame, size_t frame_len,
5108 const struct ieee80211_tx_info *frame_txctl,
5109 struct ieee80211_cts *cts)
5111 const struct ieee80211_hdr *hdr = frame;
5113 cts->frame_control =
5114 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
5115 cts->duration = ieee80211_ctstoself_duration(hw, vif,
5116 frame_len, frame_txctl);
5117 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
5119 EXPORT_SYMBOL(ieee80211_ctstoself_get);
5122 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
5123 struct ieee80211_vif *vif)
5125 struct ieee80211_local *local = hw_to_local(hw);
5126 struct sk_buff *skb = NULL;
5127 struct ieee80211_tx_data tx;
5128 struct ieee80211_sub_if_data *sdata;
5130 struct ieee80211_tx_info *info;
5131 struct ieee80211_chanctx_conf *chanctx_conf;
5133 sdata = vif_to_sdata(vif);
5136 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
5141 if (sdata->vif.type == NL80211_IFTYPE_AP) {
5142 struct beacon_data *beacon =
5143 rcu_dereference(sdata->u.ap.beacon);
5145 if (!beacon || !beacon->head)
5148 ps = &sdata->u.ap.ps;
5149 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
5150 ps = &sdata->u.mesh.ps;
5155 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
5156 goto out; /* send buffered bc/mc only after DTIM beacon */
5159 skb = skb_dequeue(&ps->bc_buf);
5162 local->total_ps_buffered--;
5164 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
5165 struct ieee80211_hdr *hdr =
5166 (struct ieee80211_hdr *) skb->data;
5167 /* more buffered multicast/broadcast frames ==> set
5168 * MoreData flag in IEEE 802.11 header to inform PS
5170 hdr->frame_control |=
5171 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
5174 if (sdata->vif.type == NL80211_IFTYPE_AP)
5175 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
5176 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
5178 ieee80211_free_txskb(hw, skb);
5181 info = IEEE80211_SKB_CB(skb);
5183 tx.flags |= IEEE80211_TX_PS_BUFFERED;
5184 info->band = chanctx_conf->def.chan->band;
5186 if (invoke_tx_handlers(&tx))
5193 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
5195 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
5197 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
5198 struct ieee80211_sub_if_data *sdata = sta->sdata;
5199 struct ieee80211_local *local = sdata->local;
5203 lockdep_assert_held(&local->sta_mtx);
5205 /* only some cases are supported right now */
5206 switch (sdata->vif.type) {
5207 case NL80211_IFTYPE_STATION:
5208 case NL80211_IFTYPE_AP:
5209 case NL80211_IFTYPE_AP_VLAN:
5216 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
5219 if (sta->reserved_tid == tid) {
5224 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
5225 sdata_err(sdata, "TID reservation already active\n");
5230 ieee80211_stop_vif_queues(sdata->local, sdata,
5231 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
5235 /* Tear down BA sessions so we stop aggregating on this TID */
5236 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
5237 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
5238 __ieee80211_stop_tx_ba_session(sta, tid,
5239 AGG_STOP_LOCAL_REQUEST);
5242 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
5243 __ieee80211_flush_queues(local, sdata, queues, false);
5245 sta->reserved_tid = tid;
5247 ieee80211_wake_vif_queues(local, sdata,
5248 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
5250 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
5251 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
5257 EXPORT_SYMBOL(ieee80211_reserve_tid);
5259 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
5261 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
5262 struct ieee80211_sub_if_data *sdata = sta->sdata;
5264 lockdep_assert_held(&sdata->local->sta_mtx);
5266 /* only some cases are supported right now */
5267 switch (sdata->vif.type) {
5268 case NL80211_IFTYPE_STATION:
5269 case NL80211_IFTYPE_AP:
5270 case NL80211_IFTYPE_AP_VLAN:
5277 if (tid != sta->reserved_tid) {
5278 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
5282 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
5284 EXPORT_SYMBOL(ieee80211_unreserve_tid);
5286 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
5287 struct sk_buff *skb, int tid,
5288 enum nl80211_band band, u32 txdata_flags)
5290 int ac = ieee80211_ac_from_tid(tid);
5292 skb_reset_mac_header(skb);
5293 skb_set_queue_mapping(skb, ac);
5294 skb->priority = tid;
5296 skb->dev = sdata->dev;
5299 * The other path calling ieee80211_xmit is from the tasklet,
5300 * and while we can handle concurrent transmissions locking
5301 * requirements are that we do not come into tx with bhs on.
5304 IEEE80211_SKB_CB(skb)->band = band;
5305 ieee80211_xmit(sdata, NULL, skb, txdata_flags);
5309 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
5310 const u8 *buf, size_t len,
5311 const u8 *dest, __be16 proto, bool unencrypted)
5313 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5314 struct ieee80211_local *local = sdata->local;
5315 struct sk_buff *skb;
5316 struct ethhdr *ehdr;
5319 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
5320 * or Pre-Authentication
5322 if (proto != sdata->control_port_protocol &&
5323 proto != cpu_to_be16(ETH_P_PREAUTH))
5327 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT;
5331 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
5332 sizeof(struct ethhdr) + len);
5336 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
5338 skb_put_data(skb, buf, len);
5340 ehdr = skb_push(skb, sizeof(struct ethhdr));
5341 memcpy(ehdr->h_dest, dest, ETH_ALEN);
5342 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
5343 ehdr->h_proto = proto;
5346 skb->protocol = htons(ETH_P_802_3);
5347 skb_reset_network_header(skb);
5348 skb_reset_mac_header(skb);
5351 __ieee80211_subif_start_xmit(skb, skb->dev, flags, 0);
5357 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev,
5358 const u8 *buf, size_t len)
5360 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5361 struct ieee80211_local *local = sdata->local;
5362 struct sk_buff *skb;
5364 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len +
5365 30 + /* header size */
5366 18); /* 11s header size */
5370 skb_reserve(skb, local->hw.extra_tx_headroom);
5371 skb_put_data(skb, buf, len);
5374 skb->protocol = htons(ETH_P_802_3);
5375 skb_reset_network_header(skb);
5376 skb_reset_mac_header(skb);
5379 __ieee80211_subif_start_xmit(skb, skb->dev, 0,
5380 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP);