2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 * Transmit and frame generation functions.
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/bitmap.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <net/net_namespace.h>
24 #include <net/ieee80211_radiotap.h>
25 #include <net/cfg80211.h>
26 #include <net/mac80211.h>
27 #include <asm/unaligned.h>
29 #include "ieee80211_i.h"
30 #include "driver-ops.h"
40 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
42 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
44 u64_stats_update_begin(&tstats->syncp);
46 tstats->tx_bytes += len;
47 u64_stats_update_end(&tstats->syncp);
50 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
51 struct sk_buff *skb, int group_addr,
54 int rate, mrate, erp, dur, i, shift = 0;
55 struct ieee80211_rate *txrate;
56 struct ieee80211_local *local = tx->local;
57 struct ieee80211_supported_band *sband;
58 struct ieee80211_hdr *hdr;
59 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
60 struct ieee80211_chanctx_conf *chanctx_conf;
64 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
66 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
67 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
71 /* assume HW handles this */
72 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
76 if (WARN_ON_ONCE(tx->rate.idx < 0))
79 sband = local->hw.wiphy->bands[info->band];
80 txrate = &sband->bitrates[tx->rate.idx];
82 erp = txrate->flags & IEEE80211_RATE_ERP_G;
85 * data and mgmt (except PS Poll):
87 * - during contention period:
88 * if addr1 is group address: 0
89 * if more fragments = 0 and addr1 is individual address: time to
90 * transmit one ACK plus SIFS
91 * if more fragments = 1 and addr1 is individual address: time to
92 * transmit next fragment plus 2 x ACK plus 3 x SIFS
95 * - control response frame (CTS or ACK) shall be transmitted using the
96 * same rate as the immediately previous frame in the frame exchange
97 * sequence, if this rate belongs to the PHY mandatory rates, or else
98 * at the highest possible rate belonging to the PHY rates in the
101 hdr = (struct ieee80211_hdr *)skb->data;
102 if (ieee80211_is_ctl(hdr->frame_control)) {
103 /* TODO: These control frames are not currently sent by
104 * mac80211, but should they be implemented, this function
105 * needs to be updated to support duration field calculation.
107 * RTS: time needed to transmit pending data/mgmt frame plus
108 * one CTS frame plus one ACK frame plus 3 x SIFS
109 * CTS: duration of immediately previous RTS minus time
110 * required to transmit CTS and its SIFS
111 * ACK: 0 if immediately previous directed data/mgmt had
112 * more=0, with more=1 duration in ACK frame is duration
113 * from previous frame minus time needed to transmit ACK
115 * PS Poll: BIT(15) | BIT(14) | aid
121 if (0 /* FIX: data/mgmt during CFP */)
122 return cpu_to_le16(32768);
124 if (group_addr) /* Group address as the destination - no ACK */
127 /* Individual destination address:
128 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
129 * CTS and ACK frames shall be transmitted using the highest rate in
130 * basic rate set that is less than or equal to the rate of the
131 * immediately previous frame and that is using the same modulation
132 * (CCK or OFDM). If no basic rate set matches with these requirements,
133 * the highest mandatory rate of the PHY that is less than or equal to
134 * the rate of the previous frame is used.
135 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
138 /* use lowest available if everything fails */
139 mrate = sband->bitrates[0].bitrate;
140 for (i = 0; i < sband->n_bitrates; i++) {
141 struct ieee80211_rate *r = &sband->bitrates[i];
143 if (r->bitrate > txrate->bitrate)
146 if ((rate_flags & r->flags) != rate_flags)
149 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
150 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
152 switch (sband->band) {
153 case IEEE80211_BAND_2GHZ: {
155 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
156 flag = IEEE80211_RATE_MANDATORY_G;
158 flag = IEEE80211_RATE_MANDATORY_B;
163 case IEEE80211_BAND_5GHZ:
164 if (r->flags & IEEE80211_RATE_MANDATORY_A)
167 case IEEE80211_BAND_60GHZ:
168 /* TODO, for now fall through */
169 case IEEE80211_NUM_BANDS:
175 /* No matching basic rate found; use highest suitable mandatory
177 rate = DIV_ROUND_UP(mrate, 1 << shift);
180 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
181 if (ieee80211_is_data_qos(hdr->frame_control) &&
182 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
185 /* Time needed to transmit ACK
186 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
187 * to closest integer */
188 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
189 tx->sdata->vif.bss_conf.use_short_preamble,
193 /* Frame is fragmented: duration increases with time needed to
194 * transmit next fragment plus ACK and 2 x SIFS. */
195 dur *= 2; /* ACK + SIFS */
197 dur += ieee80211_frame_duration(sband->band, next_frag_len,
198 txrate->bitrate, erp,
199 tx->sdata->vif.bss_conf.use_short_preamble,
203 return cpu_to_le16(dur);
207 static ieee80211_tx_result debug_noinline
208 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
210 struct ieee80211_local *local = tx->local;
211 struct ieee80211_if_managed *ifmgd;
213 /* driver doesn't support power save */
214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
217 /* hardware does dynamic power save */
218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
221 /* dynamic power save disabled */
222 if (local->hw.conf.dynamic_ps_timeout <= 0)
225 /* we are scanning, don't enable power save */
229 if (!local->ps_sdata)
232 /* No point if we're going to suspend */
233 if (local->quiescing)
236 /* dynamic ps is supported only in managed mode */
237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
240 ifmgd = &tx->sdata->u.mgd;
243 * Don't wakeup from power save if u-apsd is enabled, voip ac has
244 * u-apsd enabled and the frame is in voip class. This effectively
245 * means that even if all access categories have u-apsd enabled, in
246 * practise u-apsd is only used with the voip ac. This is a
247 * workaround for the case when received voip class packets do not
248 * have correct qos tag for some reason, due the network or the
251 * Note: ifmgd->uapsd_queues access is racy here. If the value is
252 * changed via debugfs, user needs to reassociate manually to have
253 * everything in sync.
255 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
256 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
257 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
260 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
261 ieee80211_stop_queues_by_reason(&local->hw,
262 IEEE80211_MAX_QUEUE_MAP,
263 IEEE80211_QUEUE_STOP_REASON_PS,
265 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
266 ieee80211_queue_work(&local->hw,
267 &local->dynamic_ps_disable_work);
270 /* Don't restart the timer if we're not disassociated */
271 if (!ifmgd->associated)
274 mod_timer(&local->dynamic_ps_timer, jiffies +
275 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
280 static ieee80211_tx_result debug_noinline
281 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
285 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
288 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
291 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
292 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
293 !ieee80211_is_probe_req(hdr->frame_control) &&
294 !ieee80211_is_nullfunc(hdr->frame_control))
296 * When software scanning only nullfunc frames (to notify
297 * the sleep state to the AP) and probe requests (for the
298 * active scan) are allowed, all other frames should not be
299 * sent and we should not get here, but if we do
300 * nonetheless, drop them to avoid sending them
301 * off-channel. See the link below and
302 * ieee80211_start_scan() for more.
304 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
308 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
311 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
314 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
321 if (unlikely(!assoc &&
322 ieee80211_is_data(hdr->frame_control))) {
323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
324 sdata_info(tx->sdata,
325 "dropped data frame to not associated station %pM\n",
328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
331 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
332 ieee80211_is_data(hdr->frame_control) &&
333 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
335 * No associated STAs - no need to send multicast
344 /* This function is called whenever the AP is about to exceed the maximum limit
345 * of buffered frames for power saving STAs. This situation should not really
346 * happen often during normal operation, so dropping the oldest buffered packet
347 * from each queue should be OK to make some room for new frames. */
348 static void purge_old_ps_buffers(struct ieee80211_local *local)
350 int total = 0, purged = 0;
352 struct ieee80211_sub_if_data *sdata;
353 struct sta_info *sta;
355 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
358 if (sdata->vif.type == NL80211_IFTYPE_AP)
359 ps = &sdata->u.ap.ps;
360 else if (ieee80211_vif_is_mesh(&sdata->vif))
361 ps = &sdata->u.mesh.ps;
365 skb = skb_dequeue(&ps->bc_buf);
370 total += skb_queue_len(&ps->bc_buf);
374 * Drop one frame from each station from the lowest-priority
375 * AC that has frames at all.
377 list_for_each_entry_rcu(sta, &local->sta_list, list) {
380 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
381 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
382 total += skb_queue_len(&sta->ps_tx_buf[ac]);
385 ieee80211_free_txskb(&local->hw, skb);
391 local->total_ps_buffered = total;
392 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
395 static ieee80211_tx_result
396 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
398 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
399 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
403 * broadcast/multicast frame
405 * If any of the associated/peer stations is in power save mode,
406 * the frame is buffered to be sent after DTIM beacon frame.
407 * This is done either by the hardware or us.
410 /* powersaving STAs currently only in AP/VLAN/mesh mode */
411 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
412 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
416 ps = &tx->sdata->bss->ps;
417 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
418 ps = &tx->sdata->u.mesh.ps;
424 /* no buffering for ordered frames */
425 if (ieee80211_has_order(hdr->frame_control))
428 if (ieee80211_is_probe_req(hdr->frame_control))
431 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
432 info->hw_queue = tx->sdata->vif.cab_queue;
434 /* no stations in PS mode */
435 if (!atomic_read(&ps->num_sta_ps))
438 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
440 /* device releases frame after DTIM beacon */
441 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
444 /* buffered in mac80211 */
445 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
446 purge_old_ps_buffers(tx->local);
448 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
450 "BC TX buffer full - dropping the oldest frame\n");
451 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
453 tx->local->total_ps_buffered++;
455 skb_queue_tail(&ps->bc_buf, tx->skb);
460 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
463 if (!ieee80211_is_mgmt(fc))
466 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
469 if (!ieee80211_is_robust_mgmt_frame(skb))
475 static ieee80211_tx_result
476 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
478 struct sta_info *sta = tx->sta;
479 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
480 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
481 struct ieee80211_local *local = tx->local;
486 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
487 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
488 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
489 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
490 int ac = skb_get_queue_mapping(tx->skb);
492 if (ieee80211_is_mgmt(hdr->frame_control) &&
493 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
494 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
498 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
499 sta->sta.addr, sta->sta.aid, ac);
500 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
501 purge_old_ps_buffers(tx->local);
503 /* sync with ieee80211_sta_ps_deliver_wakeup */
504 spin_lock(&sta->ps_lock);
506 * STA woke up the meantime and all the frames on ps_tx_buf have
507 * been queued to pending queue. No reordering can happen, go
508 * ahead and Tx the packet.
510 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
511 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
512 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
513 spin_unlock(&sta->ps_lock);
517 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
518 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
520 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
522 ieee80211_free_txskb(&local->hw, old);
524 tx->local->total_ps_buffered++;
526 info->control.jiffies = jiffies;
527 info->control.vif = &tx->sdata->vif;
528 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
529 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
530 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
531 spin_unlock(&sta->ps_lock);
533 if (!timer_pending(&local->sta_cleanup))
534 mod_timer(&local->sta_cleanup,
535 round_jiffies(jiffies +
536 STA_INFO_CLEANUP_INTERVAL));
539 * We queued up some frames, so the TIM bit might
540 * need to be set, recalculate it.
542 sta_info_recalc_tim(sta);
545 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
547 "STA %pM in PS mode, but polling/in SP -> send frame\n",
554 static ieee80211_tx_result debug_noinline
555 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
557 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
560 if (tx->flags & IEEE80211_TX_UNICAST)
561 return ieee80211_tx_h_unicast_ps_buf(tx);
563 return ieee80211_tx_h_multicast_ps_buf(tx);
566 static ieee80211_tx_result debug_noinline
567 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
569 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
571 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
572 if (tx->sdata->control_port_no_encrypt)
573 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
574 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
575 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
581 static ieee80211_tx_result debug_noinline
582 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
584 struct ieee80211_key *key;
585 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
586 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
588 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
591 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
593 else if (ieee80211_is_mgmt(hdr->frame_control) &&
594 is_multicast_ether_addr(hdr->addr1) &&
595 ieee80211_is_robust_mgmt_frame(tx->skb) &&
596 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
598 else if (is_multicast_ether_addr(hdr->addr1) &&
599 (key = rcu_dereference(tx->sdata->default_multicast_key)))
601 else if (!is_multicast_ether_addr(hdr->addr1) &&
602 (key = rcu_dereference(tx->sdata->default_unicast_key)))
608 bool skip_hw = false;
610 /* TODO: add threshold stuff again */
612 switch (tx->key->conf.cipher) {
613 case WLAN_CIPHER_SUITE_WEP40:
614 case WLAN_CIPHER_SUITE_WEP104:
615 case WLAN_CIPHER_SUITE_TKIP:
616 if (!ieee80211_is_data_present(hdr->frame_control))
619 case WLAN_CIPHER_SUITE_CCMP:
620 case WLAN_CIPHER_SUITE_CCMP_256:
621 case WLAN_CIPHER_SUITE_GCMP:
622 case WLAN_CIPHER_SUITE_GCMP_256:
623 if (!ieee80211_is_data_present(hdr->frame_control) &&
624 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
628 skip_hw = (tx->key->conf.flags &
629 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
630 ieee80211_is_mgmt(hdr->frame_control);
632 case WLAN_CIPHER_SUITE_AES_CMAC:
633 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
634 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
635 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
636 if (!ieee80211_is_mgmt(hdr->frame_control))
641 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
642 !ieee80211_is_deauth(hdr->frame_control)))
645 if (!skip_hw && tx->key &&
646 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
647 info->control.hw_key = &tx->key->conf;
653 static ieee80211_tx_result debug_noinline
654 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
656 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
657 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
658 struct ieee80211_supported_band *sband;
660 struct ieee80211_tx_rate_control txrc;
661 struct ieee80211_sta_rates *ratetbl = NULL;
664 memset(&txrc, 0, sizeof(txrc));
666 sband = tx->local->hw.wiphy->bands[info->band];
668 len = min_t(u32, tx->skb->len + FCS_LEN,
669 tx->local->hw.wiphy->frag_threshold);
671 /* set up the tx rate control struct we give the RC algo */
672 txrc.hw = &tx->local->hw;
674 txrc.bss_conf = &tx->sdata->vif.bss_conf;
676 txrc.reported_rate.idx = -1;
677 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
678 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
679 txrc.max_rate_idx = -1;
681 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
683 if (tx->sdata->rc_has_mcs_mask[info->band])
684 txrc.rate_idx_mcs_mask =
685 tx->sdata->rc_rateidx_mcs_mask[info->band];
687 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
688 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
689 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
690 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
692 /* set up RTS protection if desired */
693 if (len > tx->local->hw.wiphy->rts_threshold) {
697 info->control.use_rts = txrc.rts;
698 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
701 * Use short preamble if the BSS can handle it, but not for
702 * management frames unless we know the receiver can handle
703 * that -- the management frame might be to a station that
704 * just wants a probe response.
706 if (tx->sdata->vif.bss_conf.use_short_preamble &&
707 (ieee80211_is_data(hdr->frame_control) ||
708 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
709 txrc.short_preamble = true;
711 info->control.short_preamble = txrc.short_preamble;
713 /* don't ask rate control when rate already injected via radiotap */
714 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
718 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
721 * Lets not bother rate control if we're associated and cannot
722 * talk to the sta. This should not happen.
724 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
725 !rate_usable_index_exists(sband, &tx->sta->sta),
726 "%s: Dropped data frame as no usable bitrate found while "
727 "scanning and associated. Target station: "
728 "%pM on %d GHz band\n",
729 tx->sdata->name, hdr->addr1,
734 * If we're associated with the sta at this point we know we can at
735 * least send the frame at the lowest bit rate.
737 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
739 if (tx->sta && !info->control.skip_table)
740 ratetbl = rcu_dereference(tx->sta->sta.rates);
742 if (unlikely(info->control.rates[0].idx < 0)) {
744 struct ieee80211_tx_rate rate = {
745 .idx = ratetbl->rate[0].idx,
746 .flags = ratetbl->rate[0].flags,
747 .count = ratetbl->rate[0].count
750 if (ratetbl->rate[0].idx < 0)
758 tx->rate = info->control.rates[0];
761 if (txrc.reported_rate.idx < 0) {
762 txrc.reported_rate = tx->rate;
763 if (tx->sta && ieee80211_is_data(hdr->frame_control))
764 tx->sta->tx_stats.last_rate = txrc.reported_rate;
766 tx->sta->tx_stats.last_rate = txrc.reported_rate;
771 if (unlikely(!info->control.rates[0].count))
772 info->control.rates[0].count = 1;
774 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
775 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
776 info->control.rates[0].count = 1;
781 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
783 u16 *seq = &sta->tid_seq[tid];
784 __le16 ret = cpu_to_le16(*seq);
786 /* Increase the sequence number. */
787 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
792 static ieee80211_tx_result debug_noinline
793 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
795 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
796 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
801 * Packet injection may want to control the sequence
802 * number, if we have no matching interface then we
803 * neither assign one ourselves nor ask the driver to.
805 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
808 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
811 if (ieee80211_hdrlen(hdr->frame_control) < 24)
814 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
818 * Anything but QoS data that has a sequence number field
819 * (is long enough) gets a sequence number from the global
820 * counter. QoS data frames with a multicast destination
821 * also use the global counter (802.11-2012 9.3.2.10).
823 if (!ieee80211_is_data_qos(hdr->frame_control) ||
824 is_multicast_ether_addr(hdr->addr1)) {
825 /* driver should assign sequence number */
826 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
827 /* for pure STA mode without beacons, we can do it */
828 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
829 tx->sdata->sequence_number += 0x10;
831 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
836 * This should be true for injected/management frames only, for
837 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
838 * above since they are not QoS-data frames.
843 /* include per-STA, per-TID sequence counter */
845 qc = ieee80211_get_qos_ctl(hdr);
846 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
847 tx->sta->tx_stats.msdu[tid]++;
849 if (!tx->sta->sta.txq[0])
850 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
855 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
856 struct sk_buff *skb, int hdrlen,
859 struct ieee80211_local *local = tx->local;
860 struct ieee80211_tx_info *info;
862 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
863 int pos = hdrlen + per_fragm;
864 int rem = skb->len - hdrlen - per_fragm;
866 if (WARN_ON(rem < 0))
869 /* first fragment was already added to queue by caller */
872 int fraglen = per_fragm;
877 tmp = dev_alloc_skb(local->tx_headroom +
879 tx->sdata->encrypt_headroom +
880 IEEE80211_ENCRYPT_TAILROOM);
884 __skb_queue_tail(&tx->skbs, tmp);
887 local->tx_headroom + tx->sdata->encrypt_headroom);
889 /* copy control information */
890 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
892 info = IEEE80211_SKB_CB(tmp);
893 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
894 IEEE80211_TX_CTL_FIRST_FRAGMENT);
897 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
899 skb_copy_queue_mapping(tmp, skb);
900 tmp->priority = skb->priority;
903 /* copy header and data */
904 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
905 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
910 /* adjust first fragment's length */
911 skb_trim(skb, hdrlen + per_fragm);
915 static ieee80211_tx_result debug_noinline
916 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
918 struct sk_buff *skb = tx->skb;
919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
920 struct ieee80211_hdr *hdr = (void *)skb->data;
921 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
925 /* no matter what happens, tx->skb moves to tx->skbs */
926 __skb_queue_tail(&tx->skbs, skb);
929 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
932 if (tx->local->ops->set_frag_threshold)
936 * Warn when submitting a fragmented A-MPDU frame and drop it.
937 * This scenario is handled in ieee80211_tx_prepare but extra
938 * caution taken here as fragmented ampdu may cause Tx stop.
940 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
943 hdrlen = ieee80211_hdrlen(hdr->frame_control);
945 /* internal error, why isn't DONTFRAG set? */
946 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
950 * Now fragment the frame. This will allocate all the fragments and
951 * chain them (using skb as the first fragment) to skb->next.
952 * During transmission, we will remove the successfully transmitted
953 * fragments from this list. When the low-level driver rejects one
954 * of the fragments then we will simply pretend to accept the skb
955 * but store it away as pending.
957 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
960 /* update duration/seq/flags of fragments */
963 skb_queue_walk(&tx->skbs, skb) {
964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
966 hdr = (void *)skb->data;
967 info = IEEE80211_SKB_CB(skb);
969 if (!skb_queue_is_last(&tx->skbs, skb)) {
970 hdr->frame_control |= morefrags;
972 * No multi-rate retries for fragmented frames, that
973 * would completely throw off the NAV at other STAs.
975 info->control.rates[1].idx = -1;
976 info->control.rates[2].idx = -1;
977 info->control.rates[3].idx = -1;
978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
981 hdr->frame_control &= ~morefrags;
983 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
990 static ieee80211_tx_result debug_noinline
991 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
999 skb_queue_walk(&tx->skbs, skb) {
1000 ac = skb_get_queue_mapping(skb);
1001 tx->sta->tx_stats.bytes[ac] += skb->len;
1004 tx->sta->tx_stats.packets[ac]++;
1009 static ieee80211_tx_result debug_noinline
1010 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1015 switch (tx->key->conf.cipher) {
1016 case WLAN_CIPHER_SUITE_WEP40:
1017 case WLAN_CIPHER_SUITE_WEP104:
1018 return ieee80211_crypto_wep_encrypt(tx);
1019 case WLAN_CIPHER_SUITE_TKIP:
1020 return ieee80211_crypto_tkip_encrypt(tx);
1021 case WLAN_CIPHER_SUITE_CCMP:
1022 return ieee80211_crypto_ccmp_encrypt(
1023 tx, IEEE80211_CCMP_MIC_LEN);
1024 case WLAN_CIPHER_SUITE_CCMP_256:
1025 return ieee80211_crypto_ccmp_encrypt(
1026 tx, IEEE80211_CCMP_256_MIC_LEN);
1027 case WLAN_CIPHER_SUITE_AES_CMAC:
1028 return ieee80211_crypto_aes_cmac_encrypt(tx);
1029 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1030 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1031 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1032 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1033 return ieee80211_crypto_aes_gmac_encrypt(tx);
1034 case WLAN_CIPHER_SUITE_GCMP:
1035 case WLAN_CIPHER_SUITE_GCMP_256:
1036 return ieee80211_crypto_gcmp_encrypt(tx);
1038 return ieee80211_crypto_hw_encrypt(tx);
1044 static ieee80211_tx_result debug_noinline
1045 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1047 struct sk_buff *skb;
1048 struct ieee80211_hdr *hdr;
1052 skb_queue_walk(&tx->skbs, skb) {
1053 hdr = (void *) skb->data;
1054 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1055 break; /* must not overwrite AID */
1056 if (!skb_queue_is_last(&tx->skbs, skb)) {
1057 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1058 next_len = next->len;
1061 group_addr = is_multicast_ether_addr(hdr->addr1);
1064 ieee80211_duration(tx, skb, group_addr, next_len);
1070 /* actual transmit path */
1072 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1073 struct sk_buff *skb,
1074 struct ieee80211_tx_info *info,
1075 struct tid_ampdu_tx *tid_tx,
1078 bool queued = false;
1079 bool reset_agg_timer = false;
1080 struct sk_buff *purge_skb = NULL;
1082 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1083 info->flags |= IEEE80211_TX_CTL_AMPDU;
1084 reset_agg_timer = true;
1085 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1087 * nothing -- this aggregation session is being started
1088 * but that might still fail with the driver
1090 } else if (!tx->sta->sta.txq[tid]) {
1091 spin_lock(&tx->sta->lock);
1093 * Need to re-check now, because we may get here
1095 * 1) in the window during which the setup is actually
1096 * already done, but not marked yet because not all
1097 * packets are spliced over to the driver pending
1098 * queue yet -- if this happened we acquire the lock
1099 * either before or after the splice happens, but
1100 * need to recheck which of these cases happened.
1102 * 2) during session teardown, if the OPERATIONAL bit
1103 * was cleared due to the teardown but the pointer
1104 * hasn't been assigned NULL yet (or we loaded it
1105 * before it was assigned) -- in this case it may
1106 * now be NULL which means we should just let the
1107 * packet pass through because splicing the frames
1108 * back is already done.
1110 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1113 /* do nothing, let packet pass through */
1114 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1115 info->flags |= IEEE80211_TX_CTL_AMPDU;
1116 reset_agg_timer = true;
1119 info->control.vif = &tx->sdata->vif;
1120 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1121 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS |
1122 IEEE80211_TX_CTL_NO_PS_BUFFER |
1123 IEEE80211_TX_STATUS_EOSP;
1124 __skb_queue_tail(&tid_tx->pending, skb);
1125 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1126 purge_skb = __skb_dequeue(&tid_tx->pending);
1128 spin_unlock(&tx->sta->lock);
1131 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1134 /* reset session timer */
1135 if (reset_agg_timer && tid_tx->timeout)
1136 tid_tx->last_tx = jiffies;
1143 * pass %NULL for the station if unknown, a valid pointer if known
1144 * or an ERR_PTR() if the station is known not to exist
1146 static ieee80211_tx_result
1147 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1148 struct ieee80211_tx_data *tx,
1149 struct sta_info *sta, struct sk_buff *skb)
1151 struct ieee80211_local *local = sdata->local;
1152 struct ieee80211_hdr *hdr;
1153 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1157 memset(tx, 0, sizeof(*tx));
1161 __skb_queue_head_init(&tx->skbs);
1164 * If this flag is set to true anywhere, and we get here,
1165 * we are doing the needed processing, so remove the flag
1168 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1170 hdr = (struct ieee80211_hdr *) skb->data;
1176 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1177 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1178 if (!tx->sta && sdata->wdev.use_4addr)
1180 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1181 IEEE80211_TX_CTL_INJECTED) ||
1182 tx->sdata->control_port_protocol == tx->skb->protocol) {
1183 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1185 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1186 tx->sta = sta_info_get(sdata, hdr->addr1);
1189 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1190 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1191 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1192 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1193 struct tid_ampdu_tx *tid_tx;
1195 qc = ieee80211_get_qos_ctl(hdr);
1196 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1198 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1202 queued = ieee80211_tx_prep_agg(tx, skb, info,
1205 if (unlikely(queued))
1210 if (is_multicast_ether_addr(hdr->addr1)) {
1211 tx->flags &= ~IEEE80211_TX_UNICAST;
1212 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1214 tx->flags |= IEEE80211_TX_UNICAST;
1216 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1217 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1218 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1219 info->flags & IEEE80211_TX_CTL_AMPDU)
1220 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1224 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1225 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1226 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1227 ieee80211_check_fast_xmit(tx->sta);
1230 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1235 static void ieee80211_drv_tx(struct ieee80211_local *local,
1236 struct ieee80211_vif *vif,
1237 struct ieee80211_sta *pubsta,
1238 struct sk_buff *skb)
1240 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1241 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1242 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1243 struct ieee80211_tx_control control = {
1246 struct ieee80211_txq *txq = NULL;
1247 struct txq_info *txqi;
1250 if (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)
1253 if (!ieee80211_is_data(hdr->frame_control))
1257 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1259 txq = pubsta->txq[tid];
1268 txqi = to_txq_info(txq);
1269 atomic_inc(&sdata->txqs_len[ac]);
1270 if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)
1271 netif_stop_subqueue(sdata->dev, ac);
1273 spin_lock_bh(&txqi->queue.lock);
1274 txqi->byte_cnt += skb->len;
1275 __skb_queue_tail(&txqi->queue, skb);
1276 spin_unlock_bh(&txqi->queue.lock);
1278 drv_wake_tx_queue(local, txqi);
1283 drv_tx(local, &control, skb);
1286 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
1287 struct ieee80211_txq *txq)
1289 struct ieee80211_local *local = hw_to_local(hw);
1290 struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->vif);
1291 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
1292 struct ieee80211_hdr *hdr;
1293 struct sk_buff *skb = NULL;
1296 spin_lock_bh(&txqi->queue.lock);
1298 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
1301 skb = __skb_dequeue(&txqi->queue);
1305 txqi->byte_cnt -= skb->len;
1307 atomic_dec(&sdata->txqs_len[ac]);
1308 if (__netif_subqueue_stopped(sdata->dev, ac))
1309 ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);
1311 hdr = (struct ieee80211_hdr *)skb->data;
1312 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1313 struct sta_info *sta = container_of(txq->sta, struct sta_info,
1315 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1317 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
1318 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
1319 info->flags |= IEEE80211_TX_CTL_AMPDU;
1321 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1325 spin_unlock_bh(&txqi->queue.lock);
1329 EXPORT_SYMBOL(ieee80211_tx_dequeue);
1331 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1332 struct ieee80211_vif *vif,
1333 struct ieee80211_sta *sta,
1334 struct sk_buff_head *skbs,
1337 struct sk_buff *skb, *tmp;
1338 unsigned long flags;
1340 skb_queue_walk_safe(skbs, skb, tmp) {
1341 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1342 int q = info->hw_queue;
1344 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1345 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1346 __skb_unlink(skb, skbs);
1347 ieee80211_free_txskb(&local->hw, skb);
1352 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1353 if (local->queue_stop_reasons[q] ||
1354 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1355 if (unlikely(info->flags &
1356 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1357 if (local->queue_stop_reasons[q] &
1358 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1360 * Drop off-channel frames if queues
1361 * are stopped for any reason other
1362 * than off-channel operation. Never
1365 spin_unlock_irqrestore(
1366 &local->queue_stop_reason_lock,
1368 ieee80211_purge_tx_queue(&local->hw,
1375 * Since queue is stopped, queue up frames for
1376 * later transmission from the tx-pending
1377 * tasklet when the queue is woken again.
1380 skb_queue_splice_init(skbs,
1381 &local->pending[q]);
1383 skb_queue_splice_tail_init(skbs,
1384 &local->pending[q]);
1386 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1391 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1393 info->control.vif = vif;
1395 __skb_unlink(skb, skbs);
1396 ieee80211_drv_tx(local, vif, sta, skb);
1403 * Returns false if the frame couldn't be transmitted but was queued instead.
1405 static bool __ieee80211_tx(struct ieee80211_local *local,
1406 struct sk_buff_head *skbs, int led_len,
1407 struct sta_info *sta, bool txpending)
1409 struct ieee80211_tx_info *info;
1410 struct ieee80211_sub_if_data *sdata;
1411 struct ieee80211_vif *vif;
1412 struct ieee80211_sta *pubsta;
1413 struct sk_buff *skb;
1417 if (WARN_ON(skb_queue_empty(skbs)))
1420 skb = skb_peek(skbs);
1421 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1422 info = IEEE80211_SKB_CB(skb);
1423 sdata = vif_to_sdata(info->control.vif);
1424 if (sta && !sta->uploaded)
1432 switch (sdata->vif.type) {
1433 case NL80211_IFTYPE_MONITOR:
1434 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1438 sdata = rcu_dereference(local->monitor_sdata);
1442 vif->hw_queue[skb_get_queue_mapping(skb)];
1443 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1444 ieee80211_purge_tx_queue(&local->hw, skbs);
1449 case NL80211_IFTYPE_AP_VLAN:
1450 sdata = container_of(sdata->bss,
1451 struct ieee80211_sub_if_data, u.ap);
1458 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1461 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1463 WARN_ON_ONCE(!skb_queue_empty(skbs));
1469 * Invoke TX handlers, return 0 on success and non-zero if the
1470 * frame was dropped or queued.
1472 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1474 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1475 ieee80211_tx_result res = TX_DROP;
1477 #define CALL_TXH(txh) \
1480 if (res != TX_CONTINUE) \
1484 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1485 CALL_TXH(ieee80211_tx_h_check_assoc);
1486 CALL_TXH(ieee80211_tx_h_ps_buf);
1487 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1488 CALL_TXH(ieee80211_tx_h_select_key);
1489 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1490 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1492 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1493 __skb_queue_tail(&tx->skbs, tx->skb);
1498 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1499 CALL_TXH(ieee80211_tx_h_sequence);
1500 CALL_TXH(ieee80211_tx_h_fragment);
1501 /* handlers after fragment must be aware of tx info fragmentation! */
1502 CALL_TXH(ieee80211_tx_h_stats);
1503 CALL_TXH(ieee80211_tx_h_encrypt);
1504 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1505 CALL_TXH(ieee80211_tx_h_calculate_duration);
1509 if (unlikely(res == TX_DROP)) {
1510 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1512 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1514 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1516 } else if (unlikely(res == TX_QUEUED)) {
1517 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1524 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1525 struct ieee80211_vif *vif, struct sk_buff *skb,
1526 int band, struct ieee80211_sta **sta)
1528 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1529 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1530 struct ieee80211_tx_data tx;
1531 struct sk_buff *skb2;
1533 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1537 info->control.vif = vif;
1538 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1540 if (invoke_tx_handlers(&tx))
1545 *sta = &tx.sta->sta;
1550 /* this function isn't suitable for fragmented data frames */
1551 skb2 = __skb_dequeue(&tx.skbs);
1552 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1553 ieee80211_free_txskb(hw, skb2);
1554 ieee80211_purge_tx_queue(hw, &tx.skbs);
1560 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1563 * Returns false if the frame couldn't be transmitted but was queued instead.
1565 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1566 struct sta_info *sta, struct sk_buff *skb,
1569 struct ieee80211_local *local = sdata->local;
1570 struct ieee80211_tx_data tx;
1571 ieee80211_tx_result res_prepare;
1572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1576 if (unlikely(skb->len < 10)) {
1581 /* initialises tx */
1583 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1585 if (unlikely(res_prepare == TX_DROP)) {
1586 ieee80211_free_txskb(&local->hw, skb);
1588 } else if (unlikely(res_prepare == TX_QUEUED)) {
1592 /* set up hw_queue value early */
1593 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1594 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1596 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1598 if (!invoke_tx_handlers(&tx))
1599 result = __ieee80211_tx(local, &tx.skbs, led_len,
1605 /* device xmit handlers */
1607 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1608 struct sk_buff *skb,
1609 int head_need, bool may_encrypt)
1611 struct ieee80211_local *local = sdata->local;
1614 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1615 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1616 tail_need -= skb_tailroom(skb);
1617 tail_need = max_t(int, tail_need, 0);
1620 if (skb_cloned(skb) &&
1621 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1622 !skb_clone_writable(skb, ETH_HLEN) ||
1623 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1624 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1625 else if (head_need || tail_need)
1626 I802_DEBUG_INC(local->tx_expand_skb_head);
1630 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1631 wiphy_debug(local->hw.wiphy,
1632 "failed to reallocate TX buffer\n");
1639 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1640 struct sta_info *sta, struct sk_buff *skb)
1642 struct ieee80211_local *local = sdata->local;
1643 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1644 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1648 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1650 headroom = local->tx_headroom;
1652 headroom += sdata->encrypt_headroom;
1653 headroom -= skb_headroom(skb);
1654 headroom = max_t(int, 0, headroom);
1656 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1657 ieee80211_free_txskb(&local->hw, skb);
1661 hdr = (struct ieee80211_hdr *) skb->data;
1662 info->control.vif = &sdata->vif;
1664 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1665 if (ieee80211_is_data(hdr->frame_control) &&
1666 is_unicast_ether_addr(hdr->addr1)) {
1667 if (mesh_nexthop_resolve(sdata, skb))
1668 return; /* skb queued: don't free */
1670 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1674 ieee80211_set_qos_hdr(sdata, skb);
1675 ieee80211_tx(sdata, sta, skb, false);
1678 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1679 struct sk_buff *skb)
1681 struct ieee80211_radiotap_iterator iterator;
1682 struct ieee80211_radiotap_header *rthdr =
1683 (struct ieee80211_radiotap_header *) skb->data;
1684 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1685 struct ieee80211_supported_band *sband =
1686 local->hw.wiphy->bands[info->band];
1687 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1691 bool rate_found = false;
1692 u8 rate_retries = 0;
1694 u8 mcs_known, mcs_flags;
1697 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1698 IEEE80211_TX_CTL_DONTFRAG;
1701 * for every radiotap entry that is present
1702 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1703 * entries present, or -EINVAL on error)
1707 ret = ieee80211_radiotap_iterator_next(&iterator);
1712 /* see if this argument is something we can use */
1713 switch (iterator.this_arg_index) {
1715 * You must take care when dereferencing iterator.this_arg
1716 * for multibyte types... the pointer is not aligned. Use
1717 * get_unaligned((type *)iterator.this_arg) to dereference
1718 * iterator.this_arg for type "type" safely on all arches.
1720 case IEEE80211_RADIOTAP_FLAGS:
1721 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1723 * this indicates that the skb we have been
1724 * handed has the 32-bit FCS CRC at the end...
1725 * we should react to that by snipping it off
1726 * because it will be recomputed and added
1729 if (skb->len < (iterator._max_length + FCS_LEN))
1732 skb_trim(skb, skb->len - FCS_LEN);
1734 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1735 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1736 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1737 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1740 case IEEE80211_RADIOTAP_TX_FLAGS:
1741 txflags = get_unaligned_le16(iterator.this_arg);
1742 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1743 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1746 case IEEE80211_RADIOTAP_RATE:
1747 rate = *iterator.this_arg;
1752 case IEEE80211_RADIOTAP_DATA_RETRIES:
1753 rate_retries = *iterator.this_arg;
1756 case IEEE80211_RADIOTAP_MCS:
1757 mcs_known = iterator.this_arg[0];
1758 mcs_flags = iterator.this_arg[1];
1759 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
1763 rate = iterator.this_arg[2];
1764 rate_flags = IEEE80211_TX_RC_MCS;
1766 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
1767 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
1768 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
1770 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
1771 mcs_flags & IEEE80211_RADIOTAP_MCS_BW_40)
1772 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1776 * Please update the file
1777 * Documentation/networking/mac80211-injection.txt
1778 * when parsing new fields here.
1786 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1790 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
1792 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
1793 info->control.rates[i].idx = -1;
1794 info->control.rates[i].flags = 0;
1795 info->control.rates[i].count = 0;
1798 if (rate_flags & IEEE80211_TX_RC_MCS) {
1799 info->control.rates[0].idx = rate;
1801 for (i = 0; i < sband->n_bitrates; i++) {
1802 if (rate * 5 != sband->bitrates[i].bitrate)
1805 info->control.rates[0].idx = i;
1810 info->control.rates[0].flags = rate_flags;
1811 info->control.rates[0].count = min_t(u8, rate_retries + 1,
1812 local->hw.max_rate_tries);
1816 * remove the radiotap header
1817 * iterator->_max_length was sanity-checked against
1818 * skb->len by iterator init
1820 skb_pull(skb, iterator._max_length);
1825 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1826 struct net_device *dev)
1828 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1829 struct ieee80211_chanctx_conf *chanctx_conf;
1830 struct ieee80211_radiotap_header *prthdr =
1831 (struct ieee80211_radiotap_header *)skb->data;
1832 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1833 struct ieee80211_hdr *hdr;
1834 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1835 struct cfg80211_chan_def *chandef;
1839 /* check for not even having the fixed radiotap header part */
1840 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1841 goto fail; /* too short to be possibly valid */
1843 /* is it a header version we can trust to find length from? */
1844 if (unlikely(prthdr->it_version))
1845 goto fail; /* only version 0 is supported */
1847 /* then there must be a radiotap header with a length we can use */
1848 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1850 /* does the skb contain enough to deliver on the alleged length? */
1851 if (unlikely(skb->len < len_rthdr))
1852 goto fail; /* skb too short for claimed rt header extent */
1855 * fix up the pointers accounting for the radiotap
1856 * header still being in there. We are being given
1857 * a precooked IEEE80211 header so no need for
1860 skb_set_mac_header(skb, len_rthdr);
1862 * these are just fixed to the end of the rt area since we
1863 * don't have any better information and at this point, nobody cares
1865 skb_set_network_header(skb, len_rthdr);
1866 skb_set_transport_header(skb, len_rthdr);
1868 if (skb->len < len_rthdr + 2)
1871 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1872 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1874 if (skb->len < len_rthdr + hdrlen)
1878 * Initialize skb->protocol if the injected frame is a data frame
1879 * carrying a rfc1042 header
1881 if (ieee80211_is_data(hdr->frame_control) &&
1882 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1883 u8 *payload = (u8 *)hdr + hdrlen;
1885 if (ether_addr_equal(payload, rfc1042_header))
1886 skb->protocol = cpu_to_be16((payload[6] << 8) |
1890 memset(info, 0, sizeof(*info));
1892 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1893 IEEE80211_TX_CTL_INJECTED;
1895 /* process and remove the injection radiotap header */
1896 if (!ieee80211_parse_tx_radiotap(local, skb))
1902 * We process outgoing injected frames that have a local address
1903 * we handle as though they are non-injected frames.
1904 * This code here isn't entirely correct, the local MAC address
1905 * isn't always enough to find the interface to use; for proper
1906 * VLAN/WDS support we will need a different mechanism (which
1907 * likely isn't going to be monitor interfaces).
1909 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1911 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1912 if (!ieee80211_sdata_running(tmp_sdata))
1914 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1915 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1916 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1918 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1924 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1925 if (!chanctx_conf) {
1926 tmp_sdata = rcu_dereference(local->monitor_sdata);
1929 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1933 chandef = &chanctx_conf->def;
1934 else if (!local->use_chanctx)
1935 chandef = &local->_oper_chandef;
1940 * Frame injection is not allowed if beaconing is not allowed
1941 * or if we need radar detection. Beaconing is usually not allowed when
1942 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1943 * Passive scan is also used in world regulatory domains where
1944 * your country is not known and as such it should be treated as
1945 * NO TX unless the channel is explicitly allowed in which case
1946 * your current regulatory domain would not have the passive scan
1949 * Since AP mode uses monitor interfaces to inject/TX management
1950 * frames we can make AP mode the exception to this rule once it
1951 * supports radar detection as its implementation can deal with
1952 * radar detection by itself. We can do that later by adding a
1953 * monitor flag interfaces used for AP support.
1955 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1959 info->band = chandef->chan->band;
1960 ieee80211_xmit(sdata, NULL, skb);
1963 return NETDEV_TX_OK;
1969 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1972 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
1974 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
1976 return ethertype == ETH_P_TDLS &&
1978 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
1981 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
1982 struct sk_buff *skb,
1983 struct sta_info **sta_out)
1985 struct sta_info *sta;
1987 switch (sdata->vif.type) {
1988 case NL80211_IFTYPE_AP_VLAN:
1989 sta = rcu_dereference(sdata->u.vlan.sta);
1993 } else if (sdata->wdev.use_4addr) {
1997 case NL80211_IFTYPE_AP:
1998 case NL80211_IFTYPE_OCB:
1999 case NL80211_IFTYPE_ADHOC:
2000 if (is_multicast_ether_addr(skb->data)) {
2001 *sta_out = ERR_PTR(-ENOENT);
2004 sta = sta_info_get_bss(sdata, skb->data);
2006 case NL80211_IFTYPE_WDS:
2007 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2009 #ifdef CONFIG_MAC80211_MESH
2010 case NL80211_IFTYPE_MESH_POINT:
2011 /* determined much later */
2015 case NL80211_IFTYPE_STATION:
2016 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2017 sta = sta_info_get(sdata, skb->data);
2019 bool tdls_peer, tdls_auth;
2021 tdls_peer = test_sta_flag(sta,
2022 WLAN_STA_TDLS_PEER);
2023 tdls_auth = test_sta_flag(sta,
2024 WLAN_STA_TDLS_PEER_AUTH);
2026 if (tdls_peer && tdls_auth) {
2032 * TDLS link during setup - throw out frames to
2033 * peer. Allow TDLS-setup frames to unauthorized
2034 * peers for the special case of a link teardown
2035 * after a TDLS sta is removed due to being
2038 if (tdls_peer && !tdls_auth &&
2039 !ieee80211_is_tdls_setup(skb))
2045 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2053 *sta_out = sta ?: ERR_PTR(-ENOENT);
2058 * ieee80211_build_hdr - build 802.11 header in the given frame
2059 * @sdata: virtual interface to build the header for
2060 * @skb: the skb to build the header in
2061 * @info_flags: skb flags to set
2063 * This function takes the skb with 802.3 header and reformats the header to
2064 * the appropriate IEEE 802.11 header based on which interface the packet is
2065 * being transmitted on.
2067 * Note that this function also takes care of the TX status request and
2068 * potential unsharing of the SKB - this needs to be interleaved with the
2071 * The function requires the read-side RCU lock held
2073 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2075 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2076 struct sk_buff *skb, u32 info_flags,
2077 struct sta_info *sta)
2079 struct ieee80211_local *local = sdata->local;
2080 struct ieee80211_tx_info *info;
2082 u16 ethertype, hdrlen, meshhdrlen = 0;
2084 struct ieee80211_hdr hdr;
2085 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2086 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2087 const u8 *encaps_data;
2088 int encaps_len, skip_header_bytes;
2090 bool wme_sta = false, authorized = false;
2094 struct ieee80211_chanctx_conf *chanctx_conf;
2095 struct ieee80211_sub_if_data *ap_sdata;
2096 enum ieee80211_band band;
2102 /* convert Ethernet header to proper 802.11 header (based on
2103 * operation mode) */
2104 ethertype = (skb->data[12] << 8) | skb->data[13];
2105 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2107 switch (sdata->vif.type) {
2108 case NL80211_IFTYPE_AP_VLAN:
2109 if (sdata->wdev.use_4addr) {
2110 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2112 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2113 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2114 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2115 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2117 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2118 wme_sta = sta->sta.wme;
2120 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2122 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2123 if (!chanctx_conf) {
2127 band = chanctx_conf->def.chan->band;
2128 if (sdata->wdev.use_4addr)
2131 case NL80211_IFTYPE_AP:
2132 if (sdata->vif.type == NL80211_IFTYPE_AP)
2133 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2134 if (!chanctx_conf) {
2138 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2140 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2141 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2142 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2144 band = chanctx_conf->def.chan->band;
2146 case NL80211_IFTYPE_WDS:
2147 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2149 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2150 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2151 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2152 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2155 * This is the exception! WDS style interfaces are prohibited
2156 * when channel contexts are in used so this must be valid
2158 band = local->hw.conf.chandef.chan->band;
2160 #ifdef CONFIG_MAC80211_MESH
2161 case NL80211_IFTYPE_MESH_POINT:
2162 if (!is_multicast_ether_addr(skb->data)) {
2163 struct sta_info *next_hop;
2164 bool mpp_lookup = true;
2166 mpath = mesh_path_lookup(sdata, skb->data);
2169 next_hop = rcu_dereference(mpath->next_hop);
2171 !(mpath->flags & (MESH_PATH_ACTIVE |
2172 MESH_PATH_RESOLVING)))
2177 mppath = mpp_path_lookup(sdata, skb->data);
2179 mppath->exp_time = jiffies;
2182 if (mppath && mpath)
2183 mesh_path_del(mpath->sdata, mpath->dst);
2187 * Use address extension if it is a packet from
2188 * another interface or if we know the destination
2189 * is being proxied by a portal (i.e. portal address
2190 * differs from proxied address)
2192 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2193 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2194 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2195 skb->data, skb->data + ETH_ALEN);
2196 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2199 /* DS -> MBSS (802.11-2012 13.11.3.3).
2200 * For unicast with unknown forwarding information,
2201 * destination might be in the MBSS or if that fails
2202 * forwarded to another mesh gate. In either case
2203 * resolution will be handled in ieee80211_xmit(), so
2204 * leave the original DA. This also works for mcast */
2205 const u8 *mesh_da = skb->data;
2208 mesh_da = mppath->mpp;
2210 mesh_da = mpath->dst;
2212 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2213 mesh_da, sdata->vif.addr);
2214 if (is_multicast_ether_addr(mesh_da))
2215 /* DA TA mSA AE:SA */
2216 meshhdrlen = ieee80211_new_mesh_header(
2218 skb->data + ETH_ALEN, NULL);
2220 /* RA TA mDA mSA AE:DA SA */
2221 meshhdrlen = ieee80211_new_mesh_header(
2222 sdata, &mesh_hdr, skb->data,
2223 skb->data + ETH_ALEN);
2226 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2227 if (!chanctx_conf) {
2231 band = chanctx_conf->def.chan->band;
2234 case NL80211_IFTYPE_STATION:
2235 /* we already did checks when looking up the RA STA */
2236 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2240 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2241 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2242 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2244 } else if (sdata->u.mgd.use_4addr &&
2245 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2246 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2247 IEEE80211_FCTL_TODS);
2249 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2250 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2251 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2252 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2255 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2257 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2258 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2259 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2262 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2263 if (!chanctx_conf) {
2267 band = chanctx_conf->def.chan->band;
2269 case NL80211_IFTYPE_OCB:
2271 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2272 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2273 eth_broadcast_addr(hdr.addr3);
2275 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2276 if (!chanctx_conf) {
2280 band = chanctx_conf->def.chan->band;
2282 case NL80211_IFTYPE_ADHOC:
2284 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2285 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2286 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2288 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2289 if (!chanctx_conf) {
2293 band = chanctx_conf->def.chan->band;
2300 multicast = is_multicast_ether_addr(hdr.addr1);
2302 /* sta is always NULL for mesh */
2304 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2305 wme_sta = sta->sta.wme;
2306 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2307 /* For mesh, the use of the QoS header is mandatory */
2311 /* receiver does QoS (which also means we do) use it */
2313 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2318 * Drop unicast frames to unauthorised stations unless they are
2319 * EAPOL frames from the local station.
2321 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2322 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2323 !multicast && !authorized &&
2324 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2325 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2327 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2328 sdata->name, hdr.addr1);
2331 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2337 if (unlikely(!multicast && skb->sk &&
2338 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2339 struct sk_buff *ack_skb = skb_clone_sk(skb);
2342 unsigned long flags;
2345 spin_lock_irqsave(&local->ack_status_lock, flags);
2346 id = idr_alloc(&local->ack_status_frames, ack_skb,
2347 1, 0x10000, GFP_ATOMIC);
2348 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2352 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2360 * If the skb is shared we need to obtain our own copy.
2362 if (skb_shared(skb)) {
2363 struct sk_buff *tmp_skb = skb;
2365 /* can't happen -- skb is a clone if info_id != 0 */
2368 skb = skb_clone(skb, GFP_ATOMIC);
2377 hdr.frame_control = fc;
2378 hdr.duration_id = 0;
2381 skip_header_bytes = ETH_HLEN;
2382 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2383 encaps_data = bridge_tunnel_header;
2384 encaps_len = sizeof(bridge_tunnel_header);
2385 skip_header_bytes -= 2;
2386 } else if (ethertype >= ETH_P_802_3_MIN) {
2387 encaps_data = rfc1042_header;
2388 encaps_len = sizeof(rfc1042_header);
2389 skip_header_bytes -= 2;
2395 nh_pos = skb_network_header(skb) - skb->data;
2396 h_pos = skb_transport_header(skb) - skb->data;
2398 skb_pull(skb, skip_header_bytes);
2399 nh_pos -= skip_header_bytes;
2400 h_pos -= skip_header_bytes;
2402 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2405 * So we need to modify the skb header and hence need a copy of
2406 * that. The head_need variable above doesn't, so far, include
2407 * the needed header space that we don't need right away. If we
2408 * can, then we don't reallocate right now but only after the
2409 * frame arrives at the master device (if it does...)
2411 * If we cannot, however, then we will reallocate to include all
2412 * the ever needed space. Also, if we need to reallocate it anyway,
2413 * make it big enough for everything we may ever need.
2416 if (head_need > 0 || skb_cloned(skb)) {
2417 head_need += sdata->encrypt_headroom;
2418 head_need += local->tx_headroom;
2419 head_need = max_t(int, 0, head_need);
2420 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2421 ieee80211_free_txskb(&local->hw, skb);
2423 return ERR_PTR(-ENOMEM);
2428 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2429 nh_pos += encaps_len;
2430 h_pos += encaps_len;
2433 #ifdef CONFIG_MAC80211_MESH
2434 if (meshhdrlen > 0) {
2435 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2436 nh_pos += meshhdrlen;
2437 h_pos += meshhdrlen;
2441 if (ieee80211_is_data_qos(fc)) {
2442 __le16 *qos_control;
2444 qos_control = (__le16 *) skb_push(skb, 2);
2445 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2447 * Maybe we could actually set some fields here, for now just
2448 * initialise to zero to indicate no special operation.
2452 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2457 /* Update skb pointers to various headers since this modified frame
2458 * is going to go through Linux networking code that may potentially
2459 * need things like pointer to IP header. */
2460 skb_set_mac_header(skb, 0);
2461 skb_set_network_header(skb, nh_pos);
2462 skb_set_transport_header(skb, h_pos);
2464 info = IEEE80211_SKB_CB(skb);
2465 memset(info, 0, sizeof(*info));
2467 info->flags = info_flags;
2468 info->ack_frame_id = info_id;
2474 return ERR_PTR(ret);
2478 * fast-xmit overview
2480 * The core idea of this fast-xmit is to remove per-packet checks by checking
2481 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2482 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2483 * much less work can be done per packet. For example, fragmentation must be
2484 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2487 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2488 * header and other data to aid packet processing in ieee80211_xmit_fast().
2490 * The most difficult part of this is that when any of these assumptions
2491 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2492 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2493 * since the per-packet code no longer checks the conditions. This is reflected
2494 * by the calls to these functions throughout the rest of the code, and must be
2495 * maintained if any of the TX path checks change.
2498 void ieee80211_check_fast_xmit(struct sta_info *sta)
2500 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2501 struct ieee80211_local *local = sta->local;
2502 struct ieee80211_sub_if_data *sdata = sta->sdata;
2503 struct ieee80211_hdr *hdr = (void *)build.hdr;
2504 struct ieee80211_chanctx_conf *chanctx_conf;
2507 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2510 /* Locking here protects both the pointer itself, and against concurrent
2511 * invocations winning data access races to, e.g., the key pointer that
2513 * Without it, the invocation of this function right after the key
2514 * pointer changes wouldn't be sufficient, as another CPU could access
2515 * the pointer, then stall, and then do the cache update after the CPU
2516 * that invalidated the key.
2517 * With the locking, such scenarios cannot happen as the check for the
2518 * key and the fast-tx assignment are done atomically, so the CPU that
2519 * modifies the key will either wait or other one will see the key
2520 * cleared/changed already.
2522 spin_lock_bh(&sta->lock);
2523 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2524 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2525 sdata->vif.type == NL80211_IFTYPE_STATION)
2528 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2531 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2532 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2533 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2534 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2537 if (sdata->noack_map)
2540 /* fast-xmit doesn't handle fragmentation at all */
2541 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2542 !local->ops->set_frag_threshold)
2546 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2547 if (!chanctx_conf) {
2551 build.band = chanctx_conf->def.chan->band;
2554 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2556 switch (sdata->vif.type) {
2557 case NL80211_IFTYPE_ADHOC:
2559 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2560 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2561 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2564 case NL80211_IFTYPE_STATION:
2565 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2567 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2568 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2569 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2574 if (sdata->u.mgd.use_4addr) {
2575 /* non-regular ethertype cannot use the fastpath */
2576 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2577 IEEE80211_FCTL_TODS);
2579 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2580 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2581 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2582 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2586 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2588 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2589 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2590 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2593 case NL80211_IFTYPE_AP_VLAN:
2594 if (sdata->wdev.use_4addr) {
2595 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2596 IEEE80211_FCTL_TODS);
2598 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2599 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2600 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2601 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2606 case NL80211_IFTYPE_AP:
2607 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2609 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2610 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2611 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2615 /* not handled on fast-xmit */
2621 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2624 /* We store the key here so there's no point in using rcu_dereference()
2625 * but that's fine because the code that changes the pointers will call
2626 * this function after doing so. For a single CPU that would be enough,
2627 * for multiple see the comment above.
2629 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2631 build.key = rcu_access_pointer(sdata->default_unicast_key);
2633 bool gen_iv, iv_spc, mmic;
2635 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2636 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2637 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2639 /* don't handle software crypto */
2640 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2643 switch (build.key->conf.cipher) {
2644 case WLAN_CIPHER_SUITE_CCMP:
2645 case WLAN_CIPHER_SUITE_CCMP_256:
2646 /* add fixed key ID */
2648 (build.hdr + build.hdr_len)[3] =
2649 0x20 | (build.key->conf.keyidx << 6);
2650 build.pn_offs = build.hdr_len;
2652 if (gen_iv || iv_spc)
2653 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2655 case WLAN_CIPHER_SUITE_GCMP:
2656 case WLAN_CIPHER_SUITE_GCMP_256:
2657 /* add fixed key ID */
2659 (build.hdr + build.hdr_len)[3] =
2660 0x20 | (build.key->conf.keyidx << 6);
2661 build.pn_offs = build.hdr_len;
2663 if (gen_iv || iv_spc)
2664 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2666 case WLAN_CIPHER_SUITE_TKIP:
2667 /* cannot handle MMIC or IV generation in xmit-fast */
2671 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2673 case WLAN_CIPHER_SUITE_WEP40:
2674 case WLAN_CIPHER_SUITE_WEP104:
2675 /* cannot handle IV generation in fast-xmit */
2679 build.hdr_len += IEEE80211_WEP_IV_LEN;
2681 case WLAN_CIPHER_SUITE_AES_CMAC:
2682 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2683 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2684 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2686 "management cipher suite 0x%x enabled for data\n",
2687 build.key->conf.cipher);
2690 /* we don't know how to generate IVs for this at all */
2691 if (WARN_ON(gen_iv))
2693 /* pure hardware keys are OK, of course */
2694 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2696 /* cipher scheme might require space allocation */
2698 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2701 build.hdr_len += build.key->conf.iv_len;
2704 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2707 hdr->frame_control = fc;
2709 memcpy(build.hdr + build.hdr_len,
2710 rfc1042_header, sizeof(rfc1042_header));
2711 build.hdr_len += sizeof(rfc1042_header);
2713 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2714 /* if the kmemdup fails, continue w/o fast_tx */
2719 /* we might have raced against another call to this function */
2720 old = rcu_dereference_protected(sta->fast_tx,
2721 lockdep_is_held(&sta->lock));
2722 rcu_assign_pointer(sta->fast_tx, fast_tx);
2724 kfree_rcu(old, rcu_head);
2725 spin_unlock_bh(&sta->lock);
2728 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2730 struct sta_info *sta;
2733 list_for_each_entry_rcu(sta, &local->sta_list, list)
2734 ieee80211_check_fast_xmit(sta);
2738 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2740 struct ieee80211_local *local = sdata->local;
2741 struct sta_info *sta;
2745 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2746 if (sdata != sta->sdata &&
2747 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
2749 ieee80211_check_fast_xmit(sta);
2755 void ieee80211_clear_fast_xmit(struct sta_info *sta)
2757 struct ieee80211_fast_tx *fast_tx;
2759 spin_lock_bh(&sta->lock);
2760 fast_tx = rcu_dereference_protected(sta->fast_tx,
2761 lockdep_is_held(&sta->lock));
2762 RCU_INIT_POINTER(sta->fast_tx, NULL);
2763 spin_unlock_bh(&sta->lock);
2766 kfree_rcu(fast_tx, rcu_head);
2769 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
2770 struct net_device *dev, struct sta_info *sta,
2771 struct ieee80211_fast_tx *fast_tx,
2772 struct sk_buff *skb)
2774 struct ieee80211_local *local = sdata->local;
2775 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2776 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
2777 int hw_headroom = sdata->local->hw.extra_tx_headroom;
2779 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2780 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
2781 struct ieee80211_tx_data tx;
2782 ieee80211_tx_result r;
2783 struct tid_ampdu_tx *tid_tx = NULL;
2784 u8 tid = IEEE80211_NUM_TIDS;
2786 /* control port protocol needs a lot of special handling */
2787 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
2790 /* only RFC 1042 SNAP */
2791 if (ethertype < ETH_P_802_3_MIN)
2794 /* don't handle TX status request here either */
2795 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
2798 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2799 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
2800 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
2802 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
2804 if (tid_tx->timeout)
2805 tid_tx->last_tx = jiffies;
2809 /* after this point (skb is modified) we cannot return false */
2811 if (skb_shared(skb)) {
2812 struct sk_buff *tmp_skb = skb;
2814 skb = skb_clone(skb, GFP_ATOMIC);
2821 ieee80211_tx_stats(dev, skb->len + extra_head);
2823 /* will not be crypto-handled beyond what we do here, so use false
2824 * as the may-encrypt argument for the resize to not account for
2825 * more room than we already have in 'extra_head'
2827 if (unlikely(ieee80211_skb_resize(sdata, skb,
2828 max_t(int, extra_head + hw_headroom -
2829 skb_headroom(skb), 0),
2835 memcpy(ð, skb->data, ETH_HLEN - 2);
2836 hdr = (void *)skb_push(skb, extra_head);
2837 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
2838 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
2839 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
2841 memset(info, 0, sizeof(*info));
2842 info->band = fast_tx->band;
2843 info->control.vif = &sdata->vif;
2844 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
2845 IEEE80211_TX_CTL_DONTFRAG |
2846 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
2848 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
2849 *ieee80211_get_qos_ctl(hdr) = tid;
2850 if (!sta->sta.txq[0])
2851 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
2853 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
2854 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
2855 sdata->sequence_number += 0x10;
2858 if (skb_shinfo(skb)->gso_size)
2859 sta->tx_stats.msdu[tid] +=
2860 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
2862 sta->tx_stats.msdu[tid]++;
2864 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
2866 __skb_queue_head_init(&tx.skbs);
2868 tx.flags = IEEE80211_TX_UNICAST;
2872 tx.key = fast_tx->key;
2875 info->control.hw_key = &fast_tx->key->conf;
2877 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
2879 r = ieee80211_tx_h_rate_ctrl(&tx);
2883 if (r != TX_CONTINUE) {
2890 /* statistics normally done by ieee80211_tx_h_stats (but that
2891 * has to consider fragmentation, so is more complex)
2893 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
2894 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
2896 if (fast_tx->pn_offs) {
2898 u8 *crypto_hdr = skb->data + fast_tx->pn_offs;
2900 switch (fast_tx->key->conf.cipher) {
2901 case WLAN_CIPHER_SUITE_CCMP:
2902 case WLAN_CIPHER_SUITE_CCMP_256:
2903 case WLAN_CIPHER_SUITE_GCMP:
2904 case WLAN_CIPHER_SUITE_GCMP_256:
2905 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
2907 crypto_hdr[1] = pn >> 8;
2908 crypto_hdr[4] = pn >> 16;
2909 crypto_hdr[5] = pn >> 24;
2910 crypto_hdr[6] = pn >> 32;
2911 crypto_hdr[7] = pn >> 40;
2916 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2917 sdata = container_of(sdata->bss,
2918 struct ieee80211_sub_if_data, u.ap);
2920 __skb_queue_tail(&tx.skbs, skb);
2921 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
2925 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2926 struct net_device *dev,
2929 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2930 struct sta_info *sta;
2931 struct sk_buff *next;
2933 if (unlikely(skb->len < ETH_HLEN)) {
2940 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
2943 if (!IS_ERR_OR_NULL(sta)) {
2944 struct ieee80211_fast_tx *fast_tx;
2946 fast_tx = rcu_dereference(sta->fast_tx);
2949 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
2953 if (skb_is_gso(skb)) {
2954 struct sk_buff *segs;
2956 segs = skb_gso_segment(skb, 0);
2964 /* we cannot process non-linear frames on this path */
2965 if (skb_linearize(skb)) {
2970 /* the frame could be fragmented, software-encrypted, and other
2971 * things so we cannot really handle checksum offload with it -
2972 * fix it up in software before we handle anything else.
2974 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2975 skb_set_transport_header(skb,
2976 skb_checksum_start_offset(skb));
2977 if (skb_checksum_help(skb))
2990 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
2994 ieee80211_tx_stats(dev, skb->len);
2996 ieee80211_xmit(sdata, sta, skb);
3006 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3007 * @skb: packet to be sent
3008 * @dev: incoming interface
3010 * On failure skb will be freed.
3012 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3013 struct net_device *dev)
3015 __ieee80211_subif_start_xmit(skb, dev, 0);
3016 return NETDEV_TX_OK;
3020 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3021 struct sk_buff *skb, u32 info_flags)
3023 struct ieee80211_hdr *hdr;
3024 struct ieee80211_tx_data tx = {
3025 .local = sdata->local,
3028 struct sta_info *sta;
3032 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3034 skb = ERR_PTR(-EINVAL);
3038 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3042 hdr = (void *)skb->data;
3043 tx.sta = sta_info_get(sdata, hdr->addr1);
3046 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3049 return ERR_PTR(-EINVAL);
3058 * ieee80211_clear_tx_pending may not be called in a context where
3059 * it is possible that it packets could come in again.
3061 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3063 struct sk_buff *skb;
3066 for (i = 0; i < local->hw.queues; i++) {
3067 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3068 ieee80211_free_txskb(&local->hw, skb);
3073 * Returns false if the frame couldn't be transmitted but was queued instead,
3074 * which in this case means re-queued -- take as an indication to stop sending
3075 * more pending frames.
3077 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3078 struct sk_buff *skb)
3080 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3081 struct ieee80211_sub_if_data *sdata;
3082 struct sta_info *sta;
3083 struct ieee80211_hdr *hdr;
3085 struct ieee80211_chanctx_conf *chanctx_conf;
3087 sdata = vif_to_sdata(info->control.vif);
3089 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3090 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3091 if (unlikely(!chanctx_conf)) {
3095 info->band = chanctx_conf->def.chan->band;
3096 result = ieee80211_tx(sdata, NULL, skb, true);
3098 struct sk_buff_head skbs;
3100 __skb_queue_head_init(&skbs);
3101 __skb_queue_tail(&skbs, skb);
3103 hdr = (struct ieee80211_hdr *)skb->data;
3104 sta = sta_info_get(sdata, hdr->addr1);
3106 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3113 * Transmit all pending packets. Called from tasklet.
3115 void ieee80211_tx_pending(unsigned long data)
3117 struct ieee80211_local *local = (struct ieee80211_local *)data;
3118 unsigned long flags;
3124 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3125 for (i = 0; i < local->hw.queues; i++) {
3127 * If queue is stopped by something other than due to pending
3128 * frames, or we have no pending frames, proceed to next queue.
3130 if (local->queue_stop_reasons[i] ||
3131 skb_queue_empty(&local->pending[i]))
3134 while (!skb_queue_empty(&local->pending[i])) {
3135 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3136 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3138 if (WARN_ON(!info->control.vif)) {
3139 ieee80211_free_txskb(&local->hw, skb);
3143 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3146 txok = ieee80211_tx_pending_skb(local, skb);
3147 spin_lock_irqsave(&local->queue_stop_reason_lock,
3153 if (skb_queue_empty(&local->pending[i]))
3154 ieee80211_propagate_queue_wake(local, i);
3156 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3161 /* functions for drivers to get certain frames */
3163 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3164 struct ps_data *ps, struct sk_buff *skb,
3169 int i, have_bits = 0, n1, n2;
3171 /* Generate bitmap for TIM only if there are any STAs in power save
3173 if (atomic_read(&ps->num_sta_ps) > 0)
3174 /* in the hope that this is faster than
3175 * checking byte-for-byte */
3176 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3177 IEEE80211_MAX_AID+1);
3179 if (ps->dtim_count == 0)
3180 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3185 tim = pos = (u8 *) skb_put(skb, 6);
3186 *pos++ = WLAN_EID_TIM;
3188 *pos++ = ps->dtim_count;
3189 *pos++ = sdata->vif.bss_conf.dtim_period;
3191 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3194 ps->dtim_bc_mc = aid0 == 1;
3197 /* Find largest even number N1 so that bits numbered 1 through
3198 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3199 * (N2 + 1) x 8 through 2007 are 0. */
3201 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3208 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3215 /* Bitmap control */
3217 /* Part Virt Bitmap */
3218 skb_put(skb, n2 - n1);
3219 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3221 tim[1] = n2 - n1 + 4;
3223 *pos++ = aid0; /* Bitmap control */
3224 *pos++ = 0; /* Part Virt Bitmap */
3228 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3229 struct ps_data *ps, struct sk_buff *skb,
3232 struct ieee80211_local *local = sdata->local;
3235 * Not very nice, but we want to allow the driver to call
3236 * ieee80211_beacon_get() as a response to the set_tim()
3237 * callback. That, however, is already invoked under the
3238 * sta_lock to guarantee consistent and race-free update
3239 * of the tim bitmap in mac80211 and the driver.
3241 if (local->tim_in_locked_section) {
3242 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3244 spin_lock_bh(&local->tim_lock);
3245 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3246 spin_unlock_bh(&local->tim_lock);
3252 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3253 struct beacon_data *beacon)
3255 struct probe_resp *resp;
3257 size_t beacon_data_len;
3259 u8 count = beacon->csa_current_counter;
3261 switch (sdata->vif.type) {
3262 case NL80211_IFTYPE_AP:
3263 beacon_data = beacon->tail;
3264 beacon_data_len = beacon->tail_len;
3266 case NL80211_IFTYPE_ADHOC:
3267 beacon_data = beacon->head;
3268 beacon_data_len = beacon->head_len;
3270 case NL80211_IFTYPE_MESH_POINT:
3271 beacon_data = beacon->head;
3272 beacon_data_len = beacon->head_len;
3279 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3280 resp = rcu_dereference(sdata->u.ap.probe_resp);
3282 if (beacon->csa_counter_offsets[i]) {
3283 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3289 beacon_data[beacon->csa_counter_offsets[i]] = count;
3292 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3293 resp->data[resp->csa_counter_offsets[i]] = count;
3298 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3300 beacon->csa_current_counter--;
3302 /* the counter should never reach 0 */
3303 WARN_ON_ONCE(!beacon->csa_current_counter);
3305 return beacon->csa_current_counter;
3308 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3310 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3311 struct beacon_data *beacon = NULL;
3316 if (sdata->vif.type == NL80211_IFTYPE_AP)
3317 beacon = rcu_dereference(sdata->u.ap.beacon);
3318 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3319 beacon = rcu_dereference(sdata->u.ibss.presp);
3320 else if (ieee80211_vif_is_mesh(&sdata->vif))
3321 beacon = rcu_dereference(sdata->u.mesh.beacon);
3326 count = __ieee80211_csa_update_counter(beacon);
3332 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3334 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3336 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3337 struct beacon_data *beacon = NULL;
3339 size_t beacon_data_len;
3342 if (!ieee80211_sdata_running(sdata))
3346 if (vif->type == NL80211_IFTYPE_AP) {
3347 struct ieee80211_if_ap *ap = &sdata->u.ap;
3349 beacon = rcu_dereference(ap->beacon);
3350 if (WARN_ON(!beacon || !beacon->tail))
3352 beacon_data = beacon->tail;
3353 beacon_data_len = beacon->tail_len;
3354 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3355 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3357 beacon = rcu_dereference(ifibss->presp);
3361 beacon_data = beacon->head;
3362 beacon_data_len = beacon->head_len;
3363 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3364 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3366 beacon = rcu_dereference(ifmsh->beacon);
3370 beacon_data = beacon->head;
3371 beacon_data_len = beacon->head_len;
3377 if (!beacon->csa_counter_offsets[0])
3380 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3383 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3390 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3392 static struct sk_buff *
3393 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3394 struct ieee80211_vif *vif,
3395 struct ieee80211_mutable_offsets *offs,
3398 struct ieee80211_local *local = hw_to_local(hw);
3399 struct beacon_data *beacon = NULL;
3400 struct sk_buff *skb = NULL;
3401 struct ieee80211_tx_info *info;
3402 struct ieee80211_sub_if_data *sdata = NULL;
3403 enum ieee80211_band band;
3404 struct ieee80211_tx_rate_control txrc;
3405 struct ieee80211_chanctx_conf *chanctx_conf;
3406 int csa_off_base = 0;
3410 sdata = vif_to_sdata(vif);
3411 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3413 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3417 memset(offs, 0, sizeof(*offs));
3419 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3420 struct ieee80211_if_ap *ap = &sdata->u.ap;
3422 beacon = rcu_dereference(ap->beacon);
3424 if (beacon->csa_counter_offsets[0]) {
3426 __ieee80211_csa_update_counter(beacon);
3428 ieee80211_set_csa(sdata, beacon);
3432 * headroom, head length,
3433 * tail length and maximum TIM length
3435 skb = dev_alloc_skb(local->tx_headroom +
3437 beacon->tail_len + 256 +
3438 local->hw.extra_beacon_tailroom);
3442 skb_reserve(skb, local->tx_headroom);
3443 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3446 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3450 offs->tim_offset = beacon->head_len;
3451 offs->tim_length = skb->len - beacon->head_len;
3453 /* for AP the csa offsets are from tail */
3454 csa_off_base = skb->len;
3458 memcpy(skb_put(skb, beacon->tail_len),
3459 beacon->tail, beacon->tail_len);
3462 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
3463 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3464 struct ieee80211_hdr *hdr;
3466 beacon = rcu_dereference(ifibss->presp);
3470 if (beacon->csa_counter_offsets[0]) {
3472 __ieee80211_csa_update_counter(beacon);
3474 ieee80211_set_csa(sdata, beacon);
3477 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
3478 local->hw.extra_beacon_tailroom);
3481 skb_reserve(skb, local->tx_headroom);
3482 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3485 hdr = (struct ieee80211_hdr *) skb->data;
3486 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3487 IEEE80211_STYPE_BEACON);
3488 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3489 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3491 beacon = rcu_dereference(ifmsh->beacon);
3495 if (beacon->csa_counter_offsets[0]) {
3497 /* TODO: For mesh csa_counter is in TU, so
3498 * decrementing it by one isn't correct, but
3499 * for now we leave it consistent with overall
3500 * mac80211's behavior.
3502 __ieee80211_csa_update_counter(beacon);
3504 ieee80211_set_csa(sdata, beacon);
3507 if (ifmsh->sync_ops)
3508 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
3510 skb = dev_alloc_skb(local->tx_headroom +
3514 local->hw.extra_beacon_tailroom);
3517 skb_reserve(skb, local->tx_headroom);
3518 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3520 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
3523 offs->tim_offset = beacon->head_len;
3524 offs->tim_length = skb->len - beacon->head_len;
3527 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
3535 if (offs && beacon) {
3538 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
3539 u16 csa_off = beacon->csa_counter_offsets[i];
3544 offs->csa_counter_offs[i] = csa_off_base + csa_off;
3548 band = chanctx_conf->def.chan->band;
3550 info = IEEE80211_SKB_CB(skb);
3552 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
3553 info->flags |= IEEE80211_TX_CTL_NO_ACK;
3556 memset(&txrc, 0, sizeof(txrc));
3558 txrc.sband = local->hw.wiphy->bands[band];
3559 txrc.bss_conf = &sdata->vif.bss_conf;
3561 txrc.reported_rate.idx = -1;
3562 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
3563 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
3564 txrc.max_rate_idx = -1;
3566 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
3568 rate_control_get_rate(sdata, NULL, &txrc);
3570 info->control.vif = vif;
3572 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
3573 IEEE80211_TX_CTL_ASSIGN_SEQ |
3574 IEEE80211_TX_CTL_FIRST_FRAGMENT;
3582 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
3583 struct ieee80211_vif *vif,
3584 struct ieee80211_mutable_offsets *offs)
3586 return __ieee80211_beacon_get(hw, vif, offs, true);
3588 EXPORT_SYMBOL(ieee80211_beacon_get_template);
3590 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
3591 struct ieee80211_vif *vif,
3592 u16 *tim_offset, u16 *tim_length)
3594 struct ieee80211_mutable_offsets offs = {};
3595 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
3596 struct sk_buff *copy;
3597 struct ieee80211_supported_band *sband;
3604 *tim_offset = offs.tim_offset;
3607 *tim_length = offs.tim_length;
3609 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
3610 !hw_to_local(hw)->monitors)
3613 /* send a copy to monitor interfaces */
3614 copy = skb_copy(bcn, GFP_ATOMIC);
3618 shift = ieee80211_vif_get_shift(vif);
3619 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
3620 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
3624 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
3626 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
3627 struct ieee80211_vif *vif)
3629 struct ieee80211_if_ap *ap = NULL;
3630 struct sk_buff *skb = NULL;
3631 struct probe_resp *presp = NULL;
3632 struct ieee80211_hdr *hdr;
3633 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3635 if (sdata->vif.type != NL80211_IFTYPE_AP)
3641 presp = rcu_dereference(ap->probe_resp);
3645 skb = dev_alloc_skb(presp->len);
3649 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
3651 hdr = (struct ieee80211_hdr *) skb->data;
3652 memset(hdr->addr1, 0, sizeof(hdr->addr1));
3658 EXPORT_SYMBOL(ieee80211_proberesp_get);
3660 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
3661 struct ieee80211_vif *vif)
3663 struct ieee80211_sub_if_data *sdata;
3664 struct ieee80211_if_managed *ifmgd;
3665 struct ieee80211_pspoll *pspoll;
3666 struct ieee80211_local *local;
3667 struct sk_buff *skb;
3669 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3672 sdata = vif_to_sdata(vif);
3673 ifmgd = &sdata->u.mgd;
3674 local = sdata->local;
3676 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
3680 skb_reserve(skb, local->hw.extra_tx_headroom);
3682 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
3683 memset(pspoll, 0, sizeof(*pspoll));
3684 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
3685 IEEE80211_STYPE_PSPOLL);
3686 pspoll->aid = cpu_to_le16(ifmgd->aid);
3688 /* aid in PS-Poll has its two MSBs each set to 1 */
3689 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
3691 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
3692 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
3696 EXPORT_SYMBOL(ieee80211_pspoll_get);
3698 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
3699 struct ieee80211_vif *vif)
3701 struct ieee80211_hdr_3addr *nullfunc;
3702 struct ieee80211_sub_if_data *sdata;
3703 struct ieee80211_if_managed *ifmgd;
3704 struct ieee80211_local *local;
3705 struct sk_buff *skb;
3707 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
3710 sdata = vif_to_sdata(vif);
3711 ifmgd = &sdata->u.mgd;
3712 local = sdata->local;
3714 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
3718 skb_reserve(skb, local->hw.extra_tx_headroom);
3720 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
3722 memset(nullfunc, 0, sizeof(*nullfunc));
3723 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
3724 IEEE80211_STYPE_NULLFUNC |
3725 IEEE80211_FCTL_TODS);
3726 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
3727 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
3728 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
3732 EXPORT_SYMBOL(ieee80211_nullfunc_get);
3734 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
3736 const u8 *ssid, size_t ssid_len,
3739 struct ieee80211_local *local = hw_to_local(hw);
3740 struct ieee80211_hdr_3addr *hdr;
3741 struct sk_buff *skb;
3745 ie_ssid_len = 2 + ssid_len;
3747 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
3748 ie_ssid_len + tailroom);
3752 skb_reserve(skb, local->hw.extra_tx_headroom);
3754 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3755 memset(hdr, 0, sizeof(*hdr));
3756 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3757 IEEE80211_STYPE_PROBE_REQ);
3758 eth_broadcast_addr(hdr->addr1);
3759 memcpy(hdr->addr2, src_addr, ETH_ALEN);
3760 eth_broadcast_addr(hdr->addr3);
3762 pos = skb_put(skb, ie_ssid_len);
3763 *pos++ = WLAN_EID_SSID;
3766 memcpy(pos, ssid, ssid_len);
3771 EXPORT_SYMBOL(ieee80211_probereq_get);
3773 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3774 const void *frame, size_t frame_len,
3775 const struct ieee80211_tx_info *frame_txctl,
3776 struct ieee80211_rts *rts)
3778 const struct ieee80211_hdr *hdr = frame;
3780 rts->frame_control =
3781 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3782 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3784 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3785 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3787 EXPORT_SYMBOL(ieee80211_rts_get);
3789 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3790 const void *frame, size_t frame_len,
3791 const struct ieee80211_tx_info *frame_txctl,
3792 struct ieee80211_cts *cts)
3794 const struct ieee80211_hdr *hdr = frame;
3796 cts->frame_control =
3797 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3798 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3799 frame_len, frame_txctl);
3800 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3802 EXPORT_SYMBOL(ieee80211_ctstoself_get);
3805 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3806 struct ieee80211_vif *vif)
3808 struct ieee80211_local *local = hw_to_local(hw);
3809 struct sk_buff *skb = NULL;
3810 struct ieee80211_tx_data tx;
3811 struct ieee80211_sub_if_data *sdata;
3813 struct ieee80211_tx_info *info;
3814 struct ieee80211_chanctx_conf *chanctx_conf;
3816 sdata = vif_to_sdata(vif);
3819 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3824 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3825 struct beacon_data *beacon =
3826 rcu_dereference(sdata->u.ap.beacon);
3828 if (!beacon || !beacon->head)
3831 ps = &sdata->u.ap.ps;
3832 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3833 ps = &sdata->u.mesh.ps;
3838 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3839 goto out; /* send buffered bc/mc only after DTIM beacon */
3842 skb = skb_dequeue(&ps->bc_buf);
3845 local->total_ps_buffered--;
3847 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3848 struct ieee80211_hdr *hdr =
3849 (struct ieee80211_hdr *) skb->data;
3850 /* more buffered multicast/broadcast frames ==> set
3851 * MoreData flag in IEEE 802.11 header to inform PS
3853 hdr->frame_control |=
3854 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3857 if (sdata->vif.type == NL80211_IFTYPE_AP)
3858 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3859 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
3861 dev_kfree_skb_any(skb);
3864 info = IEEE80211_SKB_CB(skb);
3866 tx.flags |= IEEE80211_TX_PS_BUFFERED;
3867 info->band = chanctx_conf->def.chan->band;
3869 if (invoke_tx_handlers(&tx))
3876 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3878 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3880 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3881 struct ieee80211_sub_if_data *sdata = sta->sdata;
3882 struct ieee80211_local *local = sdata->local;
3886 lockdep_assert_held(&local->sta_mtx);
3888 /* only some cases are supported right now */
3889 switch (sdata->vif.type) {
3890 case NL80211_IFTYPE_STATION:
3891 case NL80211_IFTYPE_AP:
3892 case NL80211_IFTYPE_AP_VLAN:
3899 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3902 if (sta->reserved_tid == tid) {
3907 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3908 sdata_err(sdata, "TID reservation already active\n");
3913 ieee80211_stop_vif_queues(sdata->local, sdata,
3914 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3918 /* Tear down BA sessions so we stop aggregating on this TID */
3919 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
3920 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3921 __ieee80211_stop_tx_ba_session(sta, tid,
3922 AGG_STOP_LOCAL_REQUEST);
3925 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3926 __ieee80211_flush_queues(local, sdata, queues, false);
3928 sta->reserved_tid = tid;
3930 ieee80211_wake_vif_queues(local, sdata,
3931 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3933 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
3934 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3940 EXPORT_SYMBOL(ieee80211_reserve_tid);
3942 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3944 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3945 struct ieee80211_sub_if_data *sdata = sta->sdata;
3947 lockdep_assert_held(&sdata->local->sta_mtx);
3949 /* only some cases are supported right now */
3950 switch (sdata->vif.type) {
3951 case NL80211_IFTYPE_STATION:
3952 case NL80211_IFTYPE_AP:
3953 case NL80211_IFTYPE_AP_VLAN:
3960 if (tid != sta->reserved_tid) {
3961 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3965 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3967 EXPORT_SYMBOL(ieee80211_unreserve_tid);
3969 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3970 struct sk_buff *skb, int tid,
3971 enum ieee80211_band band)
3973 int ac = ieee802_1d_to_ac[tid & 7];
3975 skb_set_mac_header(skb, 0);
3976 skb_set_network_header(skb, 0);
3977 skb_set_transport_header(skb, 0);
3979 skb_set_queue_mapping(skb, ac);
3980 skb->priority = tid;
3982 skb->dev = sdata->dev;
3985 * The other path calling ieee80211_xmit is from the tasklet,
3986 * and while we can handle concurrent transmissions locking
3987 * requirements are that we do not come into tx with bhs on.
3990 IEEE80211_SKB_CB(skb)->band = band;
3991 ieee80211_xmit(sdata, NULL, skb);