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
7 * Copyright (C) 2018 Intel Corporation
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 * Transmit and frame generation functions.
17 #include <linux/kernel.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/if_vlan.h>
21 #include <linux/etherdevice.h>
22 #include <linux/bitmap.h>
23 #include <linux/rcupdate.h>
24 #include <linux/export.h>
25 #include <net/net_namespace.h>
26 #include <net/ieee80211_radiotap.h>
27 #include <net/cfg80211.h>
28 #include <net/mac80211.h>
29 #include <net/codel.h>
30 #include <net/codel_impl.h>
31 #include <asm/unaligned.h>
32 #include <net/fq_impl.h>
34 #include "ieee80211_i.h"
35 #include "driver-ops.h"
45 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
47 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
49 u64_stats_update_begin(&tstats->syncp);
51 tstats->tx_bytes += len;
52 u64_stats_update_end(&tstats->syncp);
55 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
56 struct sk_buff *skb, int group_addr,
59 int rate, mrate, erp, dur, i, shift = 0;
60 struct ieee80211_rate *txrate;
61 struct ieee80211_local *local = tx->local;
62 struct ieee80211_supported_band *sband;
63 struct ieee80211_hdr *hdr;
64 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
65 struct ieee80211_chanctx_conf *chanctx_conf;
68 /* assume HW handles this */
69 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
73 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
75 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
76 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
81 if (WARN_ON_ONCE(tx->rate.idx < 0))
84 sband = local->hw.wiphy->bands[info->band];
85 txrate = &sband->bitrates[tx->rate.idx];
87 erp = txrate->flags & IEEE80211_RATE_ERP_G;
90 * data and mgmt (except PS Poll):
92 * - during contention period:
93 * if addr1 is group address: 0
94 * if more fragments = 0 and addr1 is individual address: time to
95 * transmit one ACK plus SIFS
96 * if more fragments = 1 and addr1 is individual address: time to
97 * transmit next fragment plus 2 x ACK plus 3 x SIFS
100 * - control response frame (CTS or ACK) shall be transmitted using the
101 * same rate as the immediately previous frame in the frame exchange
102 * sequence, if this rate belongs to the PHY mandatory rates, or else
103 * at the highest possible rate belonging to the PHY rates in the
106 hdr = (struct ieee80211_hdr *)skb->data;
107 if (ieee80211_is_ctl(hdr->frame_control)) {
108 /* TODO: These control frames are not currently sent by
109 * mac80211, but should they be implemented, this function
110 * needs to be updated to support duration field calculation.
112 * RTS: time needed to transmit pending data/mgmt frame plus
113 * one CTS frame plus one ACK frame plus 3 x SIFS
114 * CTS: duration of immediately previous RTS minus time
115 * required to transmit CTS and its SIFS
116 * ACK: 0 if immediately previous directed data/mgmt had
117 * more=0, with more=1 duration in ACK frame is duration
118 * from previous frame minus time needed to transmit ACK
120 * PS Poll: BIT(15) | BIT(14) | aid
126 if (0 /* FIX: data/mgmt during CFP */)
127 return cpu_to_le16(32768);
129 if (group_addr) /* Group address as the destination - no ACK */
132 /* Individual destination address:
133 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
134 * CTS and ACK frames shall be transmitted using the highest rate in
135 * basic rate set that is less than or equal to the rate of the
136 * immediately previous frame and that is using the same modulation
137 * (CCK or OFDM). If no basic rate set matches with these requirements,
138 * the highest mandatory rate of the PHY that is less than or equal to
139 * the rate of the previous frame is used.
140 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
143 /* use lowest available if everything fails */
144 mrate = sband->bitrates[0].bitrate;
145 for (i = 0; i < sband->n_bitrates; i++) {
146 struct ieee80211_rate *r = &sband->bitrates[i];
148 if (r->bitrate > txrate->bitrate)
151 if ((rate_flags & r->flags) != rate_flags)
154 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
155 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
157 switch (sband->band) {
158 case NL80211_BAND_2GHZ: {
160 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
161 flag = IEEE80211_RATE_MANDATORY_G;
163 flag = IEEE80211_RATE_MANDATORY_B;
168 case NL80211_BAND_5GHZ:
169 if (r->flags & IEEE80211_RATE_MANDATORY_A)
172 case NL80211_BAND_60GHZ:
173 /* TODO, for now fall through */
174 case NUM_NL80211_BANDS:
180 /* No matching basic rate found; use highest suitable mandatory
182 rate = DIV_ROUND_UP(mrate, 1 << shift);
185 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
186 if (ieee80211_is_data_qos(hdr->frame_control) &&
187 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
190 /* Time needed to transmit ACK
191 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
192 * to closest integer */
193 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
194 tx->sdata->vif.bss_conf.use_short_preamble,
198 /* Frame is fragmented: duration increases with time needed to
199 * transmit next fragment plus ACK and 2 x SIFS. */
200 dur *= 2; /* ACK + SIFS */
202 dur += ieee80211_frame_duration(sband->band, next_frag_len,
203 txrate->bitrate, erp,
204 tx->sdata->vif.bss_conf.use_short_preamble,
208 return cpu_to_le16(dur);
212 static ieee80211_tx_result debug_noinline
213 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
215 struct ieee80211_local *local = tx->local;
216 struct ieee80211_if_managed *ifmgd;
218 /* driver doesn't support power save */
219 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
222 /* hardware does dynamic power save */
223 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
226 /* dynamic power save disabled */
227 if (local->hw.conf.dynamic_ps_timeout <= 0)
230 /* we are scanning, don't enable power save */
234 if (!local->ps_sdata)
237 /* No point if we're going to suspend */
238 if (local->quiescing)
241 /* dynamic ps is supported only in managed mode */
242 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
245 ifmgd = &tx->sdata->u.mgd;
248 * Don't wakeup from power save if u-apsd is enabled, voip ac has
249 * u-apsd enabled and the frame is in voip class. This effectively
250 * means that even if all access categories have u-apsd enabled, in
251 * practise u-apsd is only used with the voip ac. This is a
252 * workaround for the case when received voip class packets do not
253 * have correct qos tag for some reason, due the network or the
256 * Note: ifmgd->uapsd_queues access is racy here. If the value is
257 * changed via debugfs, user needs to reassociate manually to have
258 * everything in sync.
260 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
261 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
262 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
265 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
266 ieee80211_stop_queues_by_reason(&local->hw,
267 IEEE80211_MAX_QUEUE_MAP,
268 IEEE80211_QUEUE_STOP_REASON_PS,
270 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
271 ieee80211_queue_work(&local->hw,
272 &local->dynamic_ps_disable_work);
275 /* Don't restart the timer if we're not disassociated */
276 if (!ifmgd->associated)
279 mod_timer(&local->dynamic_ps_timer, jiffies +
280 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
285 static ieee80211_tx_result debug_noinline
286 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
289 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
290 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
293 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
296 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
297 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
298 !ieee80211_is_probe_req(hdr->frame_control) &&
299 !ieee80211_is_nullfunc(hdr->frame_control))
301 * When software scanning only nullfunc frames (to notify
302 * the sleep state to the AP) and probe requests (for the
303 * active scan) are allowed, all other frames should not be
304 * sent and we should not get here, but if we do
305 * nonetheless, drop them to avoid sending them
306 * off-channel. See the link below and
307 * ieee80211_start_scan() for more.
309 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
313 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
316 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
319 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
323 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
325 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
326 if (unlikely(!assoc &&
327 ieee80211_is_data(hdr->frame_control))) {
328 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
329 sdata_info(tx->sdata,
330 "dropped data frame to not associated station %pM\n",
333 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
336 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
337 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
339 * No associated STAs - no need to send multicast
348 /* This function is called whenever the AP is about to exceed the maximum limit
349 * of buffered frames for power saving STAs. This situation should not really
350 * happen often during normal operation, so dropping the oldest buffered packet
351 * from each queue should be OK to make some room for new frames. */
352 static void purge_old_ps_buffers(struct ieee80211_local *local)
354 int total = 0, purged = 0;
356 struct ieee80211_sub_if_data *sdata;
357 struct sta_info *sta;
359 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
362 if (sdata->vif.type == NL80211_IFTYPE_AP)
363 ps = &sdata->u.ap.ps;
364 else if (ieee80211_vif_is_mesh(&sdata->vif))
365 ps = &sdata->u.mesh.ps;
369 skb = skb_dequeue(&ps->bc_buf);
372 ieee80211_free_txskb(&local->hw, skb);
374 total += skb_queue_len(&ps->bc_buf);
378 * Drop one frame from each station from the lowest-priority
379 * AC that has frames at all.
381 list_for_each_entry_rcu(sta, &local->sta_list, list) {
384 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
385 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
386 total += skb_queue_len(&sta->ps_tx_buf[ac]);
389 ieee80211_free_txskb(&local->hw, skb);
395 local->total_ps_buffered = total;
396 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
399 static ieee80211_tx_result
400 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
402 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
403 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
407 * broadcast/multicast frame
409 * If any of the associated/peer stations is in power save mode,
410 * the frame is buffered to be sent after DTIM beacon frame.
411 * This is done either by the hardware or us.
414 /* powersaving STAs currently only in AP/VLAN/mesh mode */
415 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
416 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
420 ps = &tx->sdata->bss->ps;
421 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
422 ps = &tx->sdata->u.mesh.ps;
428 /* no buffering for ordered frames */
429 if (ieee80211_has_order(hdr->frame_control))
432 if (ieee80211_is_probe_req(hdr->frame_control))
435 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
436 info->hw_queue = tx->sdata->vif.cab_queue;
438 /* no stations in PS mode */
439 if (!atomic_read(&ps->num_sta_ps))
442 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
444 /* device releases frame after DTIM beacon */
445 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
448 /* buffered in mac80211 */
449 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
450 purge_old_ps_buffers(tx->local);
452 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
454 "BC TX buffer full - dropping the oldest frame\n");
455 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
457 tx->local->total_ps_buffered++;
459 skb_queue_tail(&ps->bc_buf, tx->skb);
464 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
467 if (!ieee80211_is_mgmt(fc))
470 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
473 if (!ieee80211_is_robust_mgmt_frame(skb))
479 static ieee80211_tx_result
480 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
482 struct sta_info *sta = tx->sta;
483 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
484 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
485 struct ieee80211_local *local = tx->local;
490 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
491 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
492 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
493 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
494 int ac = skb_get_queue_mapping(tx->skb);
496 if (ieee80211_is_mgmt(hdr->frame_control) &&
497 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
498 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
502 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
503 sta->sta.addr, sta->sta.aid, ac);
504 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
505 purge_old_ps_buffers(tx->local);
507 /* sync with ieee80211_sta_ps_deliver_wakeup */
508 spin_lock(&sta->ps_lock);
510 * STA woke up the meantime and all the frames on ps_tx_buf have
511 * been queued to pending queue. No reordering can happen, go
512 * ahead and Tx the packet.
514 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
515 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
516 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
517 spin_unlock(&sta->ps_lock);
521 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
522 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
524 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
526 ieee80211_free_txskb(&local->hw, old);
528 tx->local->total_ps_buffered++;
530 info->control.jiffies = jiffies;
531 info->control.vif = &tx->sdata->vif;
532 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
533 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
534 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
535 spin_unlock(&sta->ps_lock);
537 if (!timer_pending(&local->sta_cleanup))
538 mod_timer(&local->sta_cleanup,
539 round_jiffies(jiffies +
540 STA_INFO_CLEANUP_INTERVAL));
543 * We queued up some frames, so the TIM bit might
544 * need to be set, recalculate it.
546 sta_info_recalc_tim(sta);
549 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
551 "STA %pM in PS mode, but polling/in SP -> send frame\n",
558 static ieee80211_tx_result debug_noinline
559 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
561 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
564 if (tx->flags & IEEE80211_TX_UNICAST)
565 return ieee80211_tx_h_unicast_ps_buf(tx);
567 return ieee80211_tx_h_multicast_ps_buf(tx);
570 static ieee80211_tx_result debug_noinline
571 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
573 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
575 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
576 if (tx->sdata->control_port_no_encrypt)
577 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
578 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
579 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
585 static ieee80211_tx_result debug_noinline
586 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
588 struct ieee80211_key *key;
589 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
590 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
592 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
595 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
597 else if (ieee80211_is_group_privacy_action(tx->skb) &&
598 (key = rcu_dereference(tx->sdata->default_multicast_key)))
600 else if (ieee80211_is_mgmt(hdr->frame_control) &&
601 is_multicast_ether_addr(hdr->addr1) &&
602 ieee80211_is_robust_mgmt_frame(tx->skb) &&
603 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
605 else if (is_multicast_ether_addr(hdr->addr1) &&
606 (key = rcu_dereference(tx->sdata->default_multicast_key)))
608 else if (!is_multicast_ether_addr(hdr->addr1) &&
609 (key = rcu_dereference(tx->sdata->default_unicast_key)))
615 bool skip_hw = false;
617 /* TODO: add threshold stuff again */
619 switch (tx->key->conf.cipher) {
620 case WLAN_CIPHER_SUITE_WEP40:
621 case WLAN_CIPHER_SUITE_WEP104:
622 case WLAN_CIPHER_SUITE_TKIP:
623 if (!ieee80211_is_data_present(hdr->frame_control))
626 case WLAN_CIPHER_SUITE_CCMP:
627 case WLAN_CIPHER_SUITE_CCMP_256:
628 case WLAN_CIPHER_SUITE_GCMP:
629 case WLAN_CIPHER_SUITE_GCMP_256:
630 if (!ieee80211_is_data_present(hdr->frame_control) &&
631 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
633 !ieee80211_is_group_privacy_action(tx->skb))
636 skip_hw = (tx->key->conf.flags &
637 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
638 ieee80211_is_mgmt(hdr->frame_control);
640 case WLAN_CIPHER_SUITE_AES_CMAC:
641 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
643 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
644 if (!ieee80211_is_mgmt(hdr->frame_control))
649 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
650 !ieee80211_is_deauth(hdr->frame_control)))
653 if (!skip_hw && tx->key &&
654 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
655 info->control.hw_key = &tx->key->conf;
661 static ieee80211_tx_result debug_noinline
662 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
665 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
666 struct ieee80211_supported_band *sband;
668 struct ieee80211_tx_rate_control txrc;
669 struct ieee80211_sta_rates *ratetbl = NULL;
672 memset(&txrc, 0, sizeof(txrc));
674 sband = tx->local->hw.wiphy->bands[info->band];
676 len = min_t(u32, tx->skb->len + FCS_LEN,
677 tx->local->hw.wiphy->frag_threshold);
679 /* set up the tx rate control struct we give the RC algo */
680 txrc.hw = &tx->local->hw;
682 txrc.bss_conf = &tx->sdata->vif.bss_conf;
684 txrc.reported_rate.idx = -1;
685 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
687 if (tx->sdata->rc_has_mcs_mask[info->band])
688 txrc.rate_idx_mcs_mask =
689 tx->sdata->rc_rateidx_mcs_mask[info->band];
691 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
692 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
693 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
694 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
696 /* set up RTS protection if desired */
697 if (len > tx->local->hw.wiphy->rts_threshold) {
701 info->control.use_rts = txrc.rts;
702 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
705 * Use short preamble if the BSS can handle it, but not for
706 * management frames unless we know the receiver can handle
707 * that -- the management frame might be to a station that
708 * just wants a probe response.
710 if (tx->sdata->vif.bss_conf.use_short_preamble &&
711 (ieee80211_is_data(hdr->frame_control) ||
712 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
713 txrc.short_preamble = true;
715 info->control.short_preamble = txrc.short_preamble;
717 /* don't ask rate control when rate already injected via radiotap */
718 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
722 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
725 * Lets not bother rate control if we're associated and cannot
726 * talk to the sta. This should not happen.
728 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
729 !rate_usable_index_exists(sband, &tx->sta->sta),
730 "%s: Dropped data frame as no usable bitrate found while "
731 "scanning and associated. Target station: "
732 "%pM on %d GHz band\n",
733 tx->sdata->name, hdr->addr1,
738 * If we're associated with the sta at this point we know we can at
739 * least send the frame at the lowest bit rate.
741 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
743 if (tx->sta && !info->control.skip_table)
744 ratetbl = rcu_dereference(tx->sta->sta.rates);
746 if (unlikely(info->control.rates[0].idx < 0)) {
748 struct ieee80211_tx_rate rate = {
749 .idx = ratetbl->rate[0].idx,
750 .flags = ratetbl->rate[0].flags,
751 .count = ratetbl->rate[0].count
754 if (ratetbl->rate[0].idx < 0)
762 tx->rate = info->control.rates[0];
765 if (txrc.reported_rate.idx < 0) {
766 txrc.reported_rate = tx->rate;
767 if (tx->sta && ieee80211_is_data(hdr->frame_control))
768 tx->sta->tx_stats.last_rate = txrc.reported_rate;
770 tx->sta->tx_stats.last_rate = txrc.reported_rate;
775 if (unlikely(!info->control.rates[0].count))
776 info->control.rates[0].count = 1;
778 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
779 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
780 info->control.rates[0].count = 1;
785 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
787 u16 *seq = &sta->tid_seq[tid];
788 __le16 ret = cpu_to_le16(*seq);
790 /* Increase the sequence number. */
791 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
796 static ieee80211_tx_result debug_noinline
797 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
799 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
800 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
804 * Packet injection may want to control the sequence
805 * number, if we have no matching interface then we
806 * neither assign one ourselves nor ask the driver to.
808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
811 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
814 if (ieee80211_hdrlen(hdr->frame_control) < 24)
817 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
821 * Anything but QoS data that has a sequence number field
822 * (is long enough) gets a sequence number from the global
823 * counter. QoS data frames with a multicast destination
824 * also use the global counter (802.11-2012 9.3.2.10).
826 if (!ieee80211_is_data_qos(hdr->frame_control) ||
827 is_multicast_ether_addr(hdr->addr1)) {
828 if (tx->flags & IEEE80211_TX_NO_SEQNO)
830 /* driver should assign sequence number */
831 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
832 /* for pure STA mode without beacons, we can do it */
833 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
834 tx->sdata->sequence_number += 0x10;
836 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
841 * This should be true for injected/management frames only, for
842 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
843 * above since they are not QoS-data frames.
848 /* include per-STA, per-TID sequence counter */
849 tid = ieee80211_get_tid(hdr);
850 tx->sta->tx_stats.msdu[tid]++;
852 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
857 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
858 struct sk_buff *skb, int hdrlen,
861 struct ieee80211_local *local = tx->local;
862 struct ieee80211_tx_info *info;
864 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
865 int pos = hdrlen + per_fragm;
866 int rem = skb->len - hdrlen - per_fragm;
868 if (WARN_ON(rem < 0))
871 /* first fragment was already added to queue by caller */
874 int fraglen = per_fragm;
879 tmp = dev_alloc_skb(local->tx_headroom +
881 tx->sdata->encrypt_headroom +
882 IEEE80211_ENCRYPT_TAILROOM);
886 __skb_queue_tail(&tx->skbs, tmp);
889 local->tx_headroom + tx->sdata->encrypt_headroom);
891 /* copy control information */
892 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
894 info = IEEE80211_SKB_CB(tmp);
895 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
896 IEEE80211_TX_CTL_FIRST_FRAGMENT);
899 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
901 skb_copy_queue_mapping(tmp, skb);
902 tmp->priority = skb->priority;
905 /* copy header and data */
906 skb_put_data(tmp, skb->data, hdrlen);
907 skb_put_data(tmp, skb->data + pos, fraglen);
912 /* adjust first fragment's length */
913 skb_trim(skb, hdrlen + per_fragm);
917 static ieee80211_tx_result debug_noinline
918 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
920 struct sk_buff *skb = tx->skb;
921 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
922 struct ieee80211_hdr *hdr = (void *)skb->data;
923 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
927 /* no matter what happens, tx->skb moves to tx->skbs */
928 __skb_queue_tail(&tx->skbs, skb);
931 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
934 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
938 * Warn when submitting a fragmented A-MPDU frame and drop it.
939 * This scenario is handled in ieee80211_tx_prepare but extra
940 * caution taken here as fragmented ampdu may cause Tx stop.
942 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
945 hdrlen = ieee80211_hdrlen(hdr->frame_control);
947 /* internal error, why isn't DONTFRAG set? */
948 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
952 * Now fragment the frame. This will allocate all the fragments and
953 * chain them (using skb as the first fragment) to skb->next.
954 * During transmission, we will remove the successfully transmitted
955 * fragments from this list. When the low-level driver rejects one
956 * of the fragments then we will simply pretend to accept the skb
957 * but store it away as pending.
959 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
962 /* update duration/seq/flags of fragments */
965 skb_queue_walk(&tx->skbs, skb) {
966 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
968 hdr = (void *)skb->data;
969 info = IEEE80211_SKB_CB(skb);
971 if (!skb_queue_is_last(&tx->skbs, skb)) {
972 hdr->frame_control |= morefrags;
974 * No multi-rate retries for fragmented frames, that
975 * would completely throw off the NAV at other STAs.
977 info->control.rates[1].idx = -1;
978 info->control.rates[2].idx = -1;
979 info->control.rates[3].idx = -1;
980 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
981 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
983 hdr->frame_control &= ~morefrags;
985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
992 static ieee80211_tx_result debug_noinline
993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1001 skb_queue_walk(&tx->skbs, skb) {
1002 ac = skb_get_queue_mapping(skb);
1003 tx->sta->tx_stats.bytes[ac] += skb->len;
1006 tx->sta->tx_stats.packets[ac]++;
1011 static ieee80211_tx_result debug_noinline
1012 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1017 switch (tx->key->conf.cipher) {
1018 case WLAN_CIPHER_SUITE_WEP40:
1019 case WLAN_CIPHER_SUITE_WEP104:
1020 return ieee80211_crypto_wep_encrypt(tx);
1021 case WLAN_CIPHER_SUITE_TKIP:
1022 return ieee80211_crypto_tkip_encrypt(tx);
1023 case WLAN_CIPHER_SUITE_CCMP:
1024 return ieee80211_crypto_ccmp_encrypt(
1025 tx, IEEE80211_CCMP_MIC_LEN);
1026 case WLAN_CIPHER_SUITE_CCMP_256:
1027 return ieee80211_crypto_ccmp_encrypt(
1028 tx, IEEE80211_CCMP_256_MIC_LEN);
1029 case WLAN_CIPHER_SUITE_AES_CMAC:
1030 return ieee80211_crypto_aes_cmac_encrypt(tx);
1031 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1032 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1033 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1034 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1035 return ieee80211_crypto_aes_gmac_encrypt(tx);
1036 case WLAN_CIPHER_SUITE_GCMP:
1037 case WLAN_CIPHER_SUITE_GCMP_256:
1038 return ieee80211_crypto_gcmp_encrypt(tx);
1040 return ieee80211_crypto_hw_encrypt(tx);
1046 static ieee80211_tx_result debug_noinline
1047 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1049 struct sk_buff *skb;
1050 struct ieee80211_hdr *hdr;
1054 skb_queue_walk(&tx->skbs, skb) {
1055 hdr = (void *) skb->data;
1056 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1057 break; /* must not overwrite AID */
1058 if (!skb_queue_is_last(&tx->skbs, skb)) {
1059 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1060 next_len = next->len;
1063 group_addr = is_multicast_ether_addr(hdr->addr1);
1066 ieee80211_duration(tx, skb, group_addr, next_len);
1072 /* actual transmit path */
1074 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1075 struct sk_buff *skb,
1076 struct ieee80211_tx_info *info,
1077 struct tid_ampdu_tx *tid_tx,
1080 bool queued = false;
1081 bool reset_agg_timer = false;
1082 struct sk_buff *purge_skb = NULL;
1084 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1085 info->flags |= IEEE80211_TX_CTL_AMPDU;
1086 reset_agg_timer = true;
1087 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1089 * nothing -- this aggregation session is being started
1090 * but that might still fail with the driver
1092 } else if (!tx->sta->sta.txq[tid]) {
1093 spin_lock(&tx->sta->lock);
1095 * Need to re-check now, because we may get here
1097 * 1) in the window during which the setup is actually
1098 * already done, but not marked yet because not all
1099 * packets are spliced over to the driver pending
1100 * queue yet -- if this happened we acquire the lock
1101 * either before or after the splice happens, but
1102 * need to recheck which of these cases happened.
1104 * 2) during session teardown, if the OPERATIONAL bit
1105 * was cleared due to the teardown but the pointer
1106 * hasn't been assigned NULL yet (or we loaded it
1107 * before it was assigned) -- in this case it may
1108 * now be NULL which means we should just let the
1109 * packet pass through because splicing the frames
1110 * back is already done.
1112 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1115 /* do nothing, let packet pass through */
1116 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1117 info->flags |= IEEE80211_TX_CTL_AMPDU;
1118 reset_agg_timer = true;
1121 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1122 clear_sta_flag(tx->sta, WLAN_STA_SP);
1123 ps_dbg(tx->sta->sdata,
1124 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1125 tx->sta->sta.addr, tx->sta->sta.aid);
1127 info->control.vif = &tx->sdata->vif;
1128 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1129 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1130 __skb_queue_tail(&tid_tx->pending, skb);
1131 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1132 purge_skb = __skb_dequeue(&tid_tx->pending);
1134 spin_unlock(&tx->sta->lock);
1137 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1140 /* reset session timer */
1141 if (reset_agg_timer)
1142 tid_tx->last_tx = jiffies;
1149 * pass %NULL for the station if unknown, a valid pointer if known
1150 * or an ERR_PTR() if the station is known not to exist
1152 static ieee80211_tx_result
1153 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1154 struct ieee80211_tx_data *tx,
1155 struct sta_info *sta, struct sk_buff *skb)
1157 struct ieee80211_local *local = sdata->local;
1158 struct ieee80211_hdr *hdr;
1159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1162 memset(tx, 0, sizeof(*tx));
1166 __skb_queue_head_init(&tx->skbs);
1169 * If this flag is set to true anywhere, and we get here,
1170 * we are doing the needed processing, so remove the flag
1173 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1175 hdr = (struct ieee80211_hdr *) skb->data;
1181 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1182 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1183 if (!tx->sta && sdata->wdev.use_4addr)
1185 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1186 IEEE80211_TX_CTL_INJECTED) ||
1187 tx->sdata->control_port_protocol == tx->skb->protocol) {
1188 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1190 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1191 tx->sta = sta_info_get(sdata, hdr->addr1);
1194 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1195 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1196 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1197 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1198 struct tid_ampdu_tx *tid_tx;
1200 tid = ieee80211_get_tid(hdr);
1202 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1206 queued = ieee80211_tx_prep_agg(tx, skb, info,
1209 if (unlikely(queued))
1214 if (is_multicast_ether_addr(hdr->addr1)) {
1215 tx->flags &= ~IEEE80211_TX_UNICAST;
1216 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1218 tx->flags |= IEEE80211_TX_UNICAST;
1220 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1221 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1222 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1223 info->flags & IEEE80211_TX_CTL_AMPDU)
1224 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1228 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1229 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1230 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1231 ieee80211_check_fast_xmit(tx->sta);
1234 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1239 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1240 struct ieee80211_vif *vif,
1241 struct sta_info *sta,
1242 struct sk_buff *skb)
1244 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1245 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1246 struct ieee80211_txq *txq = NULL;
1248 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1249 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1252 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
1253 if ((!ieee80211_is_mgmt(hdr->frame_control) ||
1254 ieee80211_is_bufferable_mmpdu(hdr->frame_control)) &&
1255 sta && sta->uploaded) {
1257 * This will be NULL if the driver didn't set the
1258 * opt-in hardware flag.
1260 txq = sta->sta.txq[IEEE80211_NUM_TIDS];
1263 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1268 txq = sta->sta.txq[tid];
1276 return to_txq_info(txq);
1279 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1281 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1284 static u32 codel_skb_len_func(const struct sk_buff *skb)
1289 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1291 const struct ieee80211_tx_info *info;
1293 info = (const struct ieee80211_tx_info *)skb->cb;
1294 return info->control.enqueue_time;
1297 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1300 struct ieee80211_local *local;
1301 struct txq_info *txqi;
1303 struct fq_flow *flow;
1306 local = vif_to_sdata(txqi->txq.vif)->local;
1309 if (cvars == &txqi->def_cvars)
1310 flow = &txqi->def_flow;
1312 flow = &fq->flows[cvars - local->cvars];
1314 return fq_flow_dequeue(fq, flow);
1317 static void codel_drop_func(struct sk_buff *skb,
1320 struct ieee80211_local *local;
1321 struct ieee80211_hw *hw;
1322 struct txq_info *txqi;
1325 local = vif_to_sdata(txqi->txq.vif)->local;
1328 ieee80211_free_txskb(hw, skb);
1331 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1333 struct fq_flow *flow)
1335 struct ieee80211_local *local;
1336 struct txq_info *txqi;
1337 struct codel_vars *cvars;
1338 struct codel_params *cparams;
1339 struct codel_stats *cstats;
1341 local = container_of(fq, struct ieee80211_local, fq);
1342 txqi = container_of(tin, struct txq_info, tin);
1343 cstats = &txqi->cstats;
1345 if (txqi->txq.sta) {
1346 struct sta_info *sta = container_of(txqi->txq.sta,
1347 struct sta_info, sta);
1348 cparams = &sta->cparams;
1350 cparams = &local->cparams;
1353 if (flow == &txqi->def_flow)
1354 cvars = &txqi->def_cvars;
1356 cvars = &local->cvars[flow - fq->flows];
1358 return codel_dequeue(txqi,
1364 codel_skb_time_func,
1366 codel_dequeue_func);
1369 static void fq_skb_free_func(struct fq *fq,
1371 struct fq_flow *flow,
1372 struct sk_buff *skb)
1374 struct ieee80211_local *local;
1376 local = container_of(fq, struct ieee80211_local, fq);
1377 ieee80211_free_txskb(&local->hw, skb);
1380 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1383 struct sk_buff *skb)
1385 struct txq_info *txqi;
1387 txqi = container_of(tin, struct txq_info, tin);
1388 return &txqi->def_flow;
1391 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1392 struct txq_info *txqi,
1393 struct sk_buff *skb)
1395 struct fq *fq = &local->fq;
1396 struct fq_tin *tin = &txqi->tin;
1398 ieee80211_set_skb_enqueue_time(skb);
1399 fq_tin_enqueue(fq, tin, skb,
1401 fq_flow_get_default_func);
1404 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1405 struct fq_flow *flow, struct sk_buff *skb,
1408 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1410 return info->control.vif == data;
1413 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1414 struct ieee80211_sub_if_data *sdata)
1416 struct fq *fq = &local->fq;
1417 struct txq_info *txqi;
1419 struct ieee80211_sub_if_data *ap;
1421 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1424 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1429 txqi = to_txq_info(ap->vif.txq);
1432 spin_lock_bh(&fq->lock);
1433 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1435 spin_unlock_bh(&fq->lock);
1438 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1439 struct sta_info *sta,
1440 struct txq_info *txqi, int tid)
1442 fq_tin_init(&txqi->tin);
1443 fq_flow_init(&txqi->def_flow);
1444 codel_vars_init(&txqi->def_cvars);
1445 codel_stats_init(&txqi->cstats);
1446 __skb_queue_head_init(&txqi->frags);
1448 txqi->txq.vif = &sdata->vif;
1451 sdata->vif.txq = &txqi->txq;
1453 txqi->txq.ac = IEEE80211_AC_BE;
1458 if (tid == IEEE80211_NUM_TIDS) {
1459 /* Drivers need to opt in to the bufferable MMPDU TXQ */
1460 if (!ieee80211_hw_check(&sdata->local->hw, BUFF_MMPDU_TXQ))
1462 txqi->txq.ac = IEEE80211_AC_VO;
1464 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1467 txqi->txq.sta = &sta->sta;
1468 txqi->txq.tid = tid;
1469 sta->sta.txq[tid] = &txqi->txq;
1472 void ieee80211_txq_purge(struct ieee80211_local *local,
1473 struct txq_info *txqi)
1475 struct fq *fq = &local->fq;
1476 struct fq_tin *tin = &txqi->tin;
1478 fq_tin_reset(fq, tin, fq_skb_free_func);
1479 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1482 void ieee80211_txq_set_params(struct ieee80211_local *local)
1484 if (local->hw.wiphy->txq_limit)
1485 local->fq.limit = local->hw.wiphy->txq_limit;
1487 local->hw.wiphy->txq_limit = local->fq.limit;
1489 if (local->hw.wiphy->txq_memory_limit)
1490 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1492 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1494 if (local->hw.wiphy->txq_quantum)
1495 local->fq.quantum = local->hw.wiphy->txq_quantum;
1497 local->hw.wiphy->txq_quantum = local->fq.quantum;
1500 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1502 struct fq *fq = &local->fq;
1505 bool supp_vht = false;
1506 enum nl80211_band band;
1508 if (!local->ops->wake_tx_queue)
1511 ret = fq_init(fq, 4096);
1516 * If the hardware doesn't support VHT, it is safe to limit the maximum
1517 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1519 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1520 struct ieee80211_supported_band *sband;
1522 sband = local->hw.wiphy->bands[band];
1526 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1530 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1532 codel_params_init(&local->cparams);
1533 local->cparams.interval = MS2TIME(100);
1534 local->cparams.target = MS2TIME(20);
1535 local->cparams.ecn = true;
1537 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1539 if (!local->cvars) {
1540 spin_lock_bh(&fq->lock);
1541 fq_reset(fq, fq_skb_free_func);
1542 spin_unlock_bh(&fq->lock);
1546 for (i = 0; i < fq->flows_cnt; i++)
1547 codel_vars_init(&local->cvars[i]);
1549 ieee80211_txq_set_params(local);
1554 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1556 struct fq *fq = &local->fq;
1558 if (!local->ops->wake_tx_queue)
1561 kfree(local->cvars);
1562 local->cvars = NULL;
1564 spin_lock_bh(&fq->lock);
1565 fq_reset(fq, fq_skb_free_func);
1566 spin_unlock_bh(&fq->lock);
1569 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1570 struct ieee80211_sub_if_data *sdata,
1571 struct sta_info *sta,
1572 struct sk_buff *skb)
1574 struct fq *fq = &local->fq;
1575 struct ieee80211_vif *vif;
1576 struct txq_info *txqi;
1578 if (!local->ops->wake_tx_queue ||
1579 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1582 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1583 sdata = container_of(sdata->bss,
1584 struct ieee80211_sub_if_data, u.ap);
1587 txqi = ieee80211_get_txq(local, vif, sta, skb);
1592 spin_lock_bh(&fq->lock);
1593 ieee80211_txq_enqueue(local, txqi, skb);
1594 spin_unlock_bh(&fq->lock);
1596 drv_wake_tx_queue(local, txqi);
1601 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1602 struct ieee80211_vif *vif,
1603 struct ieee80211_sta *sta,
1604 struct sk_buff_head *skbs,
1607 struct ieee80211_tx_control control = {};
1608 struct sk_buff *skb, *tmp;
1609 unsigned long flags;
1611 skb_queue_walk_safe(skbs, skb, tmp) {
1612 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1613 int q = info->hw_queue;
1615 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1616 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1617 __skb_unlink(skb, skbs);
1618 ieee80211_free_txskb(&local->hw, skb);
1623 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1624 if (local->queue_stop_reasons[q] ||
1625 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1626 if (unlikely(info->flags &
1627 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1628 if (local->queue_stop_reasons[q] &
1629 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1631 * Drop off-channel frames if queues
1632 * are stopped for any reason other
1633 * than off-channel operation. Never
1636 spin_unlock_irqrestore(
1637 &local->queue_stop_reason_lock,
1639 ieee80211_purge_tx_queue(&local->hw,
1646 * Since queue is stopped, queue up frames for
1647 * later transmission from the tx-pending
1648 * tasklet when the queue is woken again.
1651 skb_queue_splice_init(skbs,
1652 &local->pending[q]);
1654 skb_queue_splice_tail_init(skbs,
1655 &local->pending[q]);
1657 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1662 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1664 info->control.vif = vif;
1667 __skb_unlink(skb, skbs);
1668 drv_tx(local, &control, skb);
1675 * Returns false if the frame couldn't be transmitted but was queued instead.
1677 static bool __ieee80211_tx(struct ieee80211_local *local,
1678 struct sk_buff_head *skbs, int led_len,
1679 struct sta_info *sta, bool txpending)
1681 struct ieee80211_tx_info *info;
1682 struct ieee80211_sub_if_data *sdata;
1683 struct ieee80211_vif *vif;
1684 struct ieee80211_sta *pubsta;
1685 struct sk_buff *skb;
1689 if (WARN_ON(skb_queue_empty(skbs)))
1692 skb = skb_peek(skbs);
1693 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1694 info = IEEE80211_SKB_CB(skb);
1695 sdata = vif_to_sdata(info->control.vif);
1696 if (sta && !sta->uploaded)
1704 switch (sdata->vif.type) {
1705 case NL80211_IFTYPE_MONITOR:
1706 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1710 sdata = rcu_dereference(local->monitor_sdata);
1714 vif->hw_queue[skb_get_queue_mapping(skb)];
1715 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1716 ieee80211_purge_tx_queue(&local->hw, skbs);
1721 case NL80211_IFTYPE_AP_VLAN:
1722 sdata = container_of(sdata->bss,
1723 struct ieee80211_sub_if_data, u.ap);
1730 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1733 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1735 WARN_ON_ONCE(!skb_queue_empty(skbs));
1741 * Invoke TX handlers, return 0 on success and non-zero if the
1742 * frame was dropped or queued.
1744 * The handlers are split into an early and late part. The latter is everything
1745 * that can be sensitive to reordering, and will be deferred to after packets
1746 * are dequeued from the intermediate queues (when they are enabled).
1748 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1750 ieee80211_tx_result res = TX_DROP;
1752 #define CALL_TXH(txh) \
1755 if (res != TX_CONTINUE) \
1759 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1760 CALL_TXH(ieee80211_tx_h_check_assoc);
1761 CALL_TXH(ieee80211_tx_h_ps_buf);
1762 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1763 CALL_TXH(ieee80211_tx_h_select_key);
1764 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1765 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1768 if (unlikely(res == TX_DROP)) {
1769 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1771 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1773 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1775 } else if (unlikely(res == TX_QUEUED)) {
1776 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1784 * Late handlers can be called while the sta lock is held. Handlers that can
1785 * cause packets to be generated will cause deadlock!
1787 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1789 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1790 ieee80211_tx_result res = TX_CONTINUE;
1792 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1793 __skb_queue_tail(&tx->skbs, tx->skb);
1798 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1799 CALL_TXH(ieee80211_tx_h_sequence);
1800 CALL_TXH(ieee80211_tx_h_fragment);
1801 /* handlers after fragment must be aware of tx info fragmentation! */
1802 CALL_TXH(ieee80211_tx_h_stats);
1803 CALL_TXH(ieee80211_tx_h_encrypt);
1804 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1805 CALL_TXH(ieee80211_tx_h_calculate_duration);
1809 if (unlikely(res == TX_DROP)) {
1810 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1812 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1814 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1816 } else if (unlikely(res == TX_QUEUED)) {
1817 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1824 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1826 int r = invoke_tx_handlers_early(tx);
1830 return invoke_tx_handlers_late(tx);
1833 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1834 struct ieee80211_vif *vif, struct sk_buff *skb,
1835 int band, struct ieee80211_sta **sta)
1837 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1838 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1839 struct ieee80211_tx_data tx;
1840 struct sk_buff *skb2;
1842 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1846 info->control.vif = vif;
1847 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1849 if (invoke_tx_handlers(&tx))
1854 *sta = &tx.sta->sta;
1859 /* this function isn't suitable for fragmented data frames */
1860 skb2 = __skb_dequeue(&tx.skbs);
1861 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1862 ieee80211_free_txskb(hw, skb2);
1863 ieee80211_purge_tx_queue(hw, &tx.skbs);
1869 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1872 * Returns false if the frame couldn't be transmitted but was queued instead.
1874 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1875 struct sta_info *sta, struct sk_buff *skb,
1876 bool txpending, u32 txdata_flags)
1878 struct ieee80211_local *local = sdata->local;
1879 struct ieee80211_tx_data tx;
1880 ieee80211_tx_result res_prepare;
1881 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1885 if (unlikely(skb->len < 10)) {
1890 /* initialises tx */
1892 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1894 tx.flags |= txdata_flags;
1896 if (unlikely(res_prepare == TX_DROP)) {
1897 ieee80211_free_txskb(&local->hw, skb);
1899 } else if (unlikely(res_prepare == TX_QUEUED)) {
1903 /* set up hw_queue value early */
1904 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1905 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1907 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1909 if (invoke_tx_handlers_early(&tx))
1912 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1915 if (!invoke_tx_handlers_late(&tx))
1916 result = __ieee80211_tx(local, &tx.skbs, led_len,
1922 /* device xmit handlers */
1924 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1925 struct sk_buff *skb,
1926 int head_need, bool may_encrypt)
1928 struct ieee80211_local *local = sdata->local;
1931 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1932 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1933 tail_need -= skb_tailroom(skb);
1934 tail_need = max_t(int, tail_need, 0);
1937 if (skb_cloned(skb) &&
1938 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1939 !skb_clone_writable(skb, ETH_HLEN) ||
1940 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1941 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1942 else if (head_need || tail_need)
1943 I802_DEBUG_INC(local->tx_expand_skb_head);
1947 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1948 wiphy_debug(local->hw.wiphy,
1949 "failed to reallocate TX buffer\n");
1956 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1957 struct sta_info *sta, struct sk_buff *skb,
1960 struct ieee80211_local *local = sdata->local;
1961 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1962 struct ieee80211_hdr *hdr;
1966 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1968 headroom = local->tx_headroom;
1970 headroom += sdata->encrypt_headroom;
1971 headroom -= skb_headroom(skb);
1972 headroom = max_t(int, 0, headroom);
1974 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1975 ieee80211_free_txskb(&local->hw, skb);
1979 hdr = (struct ieee80211_hdr *) skb->data;
1980 info->control.vif = &sdata->vif;
1982 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1983 if (ieee80211_is_data(hdr->frame_control) &&
1984 is_unicast_ether_addr(hdr->addr1)) {
1985 if (mesh_nexthop_resolve(sdata, skb))
1986 return; /* skb queued: don't free */
1988 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1992 ieee80211_set_qos_hdr(sdata, skb);
1993 ieee80211_tx(sdata, sta, skb, false, txdata_flags);
1996 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1997 struct sk_buff *skb)
1999 struct ieee80211_radiotap_iterator iterator;
2000 struct ieee80211_radiotap_header *rthdr =
2001 (struct ieee80211_radiotap_header *) skb->data;
2002 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2003 struct ieee80211_supported_band *sband =
2004 local->hw.wiphy->bands[info->band];
2005 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2009 bool rate_found = false;
2010 u8 rate_retries = 0;
2012 u8 mcs_known, mcs_flags, mcs_bw;
2014 u8 vht_mcs = 0, vht_nss = 0;
2017 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2018 IEEE80211_TX_CTL_DONTFRAG;
2021 * for every radiotap entry that is present
2022 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2023 * entries present, or -EINVAL on error)
2027 ret = ieee80211_radiotap_iterator_next(&iterator);
2032 /* see if this argument is something we can use */
2033 switch (iterator.this_arg_index) {
2035 * You must take care when dereferencing iterator.this_arg
2036 * for multibyte types... the pointer is not aligned. Use
2037 * get_unaligned((type *)iterator.this_arg) to dereference
2038 * iterator.this_arg for type "type" safely on all arches.
2040 case IEEE80211_RADIOTAP_FLAGS:
2041 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2043 * this indicates that the skb we have been
2044 * handed has the 32-bit FCS CRC at the end...
2045 * we should react to that by snipping it off
2046 * because it will be recomputed and added
2049 if (skb->len < (iterator._max_length + FCS_LEN))
2052 skb_trim(skb, skb->len - FCS_LEN);
2054 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2055 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2056 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2057 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2060 case IEEE80211_RADIOTAP_TX_FLAGS:
2061 txflags = get_unaligned_le16(iterator.this_arg);
2062 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2063 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2066 case IEEE80211_RADIOTAP_RATE:
2067 rate = *iterator.this_arg;
2072 case IEEE80211_RADIOTAP_DATA_RETRIES:
2073 rate_retries = *iterator.this_arg;
2076 case IEEE80211_RADIOTAP_MCS:
2077 mcs_known = iterator.this_arg[0];
2078 mcs_flags = iterator.this_arg[1];
2079 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2083 rate = iterator.this_arg[2];
2084 rate_flags = IEEE80211_TX_RC_MCS;
2086 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2087 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2088 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2090 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2091 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2092 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2093 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2096 case IEEE80211_RADIOTAP_VHT:
2097 vht_known = get_unaligned_le16(iterator.this_arg);
2100 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2101 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2102 (iterator.this_arg[2] &
2103 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2104 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2106 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2107 if (iterator.this_arg[3] == 1)
2109 IEEE80211_TX_RC_40_MHZ_WIDTH;
2110 else if (iterator.this_arg[3] == 4)
2112 IEEE80211_TX_RC_80_MHZ_WIDTH;
2113 else if (iterator.this_arg[3] == 11)
2115 IEEE80211_TX_RC_160_MHZ_WIDTH;
2118 vht_mcs = iterator.this_arg[4] >> 4;
2119 vht_nss = iterator.this_arg[4] & 0xF;
2123 * Please update the file
2124 * Documentation/networking/mac80211-injection.txt
2125 * when parsing new fields here.
2133 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2137 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2139 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2140 info->control.rates[i].idx = -1;
2141 info->control.rates[i].flags = 0;
2142 info->control.rates[i].count = 0;
2145 if (rate_flags & IEEE80211_TX_RC_MCS) {
2146 info->control.rates[0].idx = rate;
2147 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2148 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2151 for (i = 0; i < sband->n_bitrates; i++) {
2152 if (rate * 5 != sband->bitrates[i].bitrate)
2155 info->control.rates[0].idx = i;
2160 if (info->control.rates[0].idx < 0)
2161 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2163 info->control.rates[0].flags = rate_flags;
2164 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2165 local->hw.max_rate_tries);
2169 * remove the radiotap header
2170 * iterator->_max_length was sanity-checked against
2171 * skb->len by iterator init
2173 skb_pull(skb, iterator._max_length);
2178 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2179 struct net_device *dev)
2181 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2182 struct ieee80211_chanctx_conf *chanctx_conf;
2183 struct ieee80211_radiotap_header *prthdr =
2184 (struct ieee80211_radiotap_header *)skb->data;
2185 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2186 struct ieee80211_hdr *hdr;
2187 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2188 struct cfg80211_chan_def *chandef;
2192 /* check for not even having the fixed radiotap header part */
2193 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2194 goto fail; /* too short to be possibly valid */
2196 /* is it a header version we can trust to find length from? */
2197 if (unlikely(prthdr->it_version))
2198 goto fail; /* only version 0 is supported */
2200 /* then there must be a radiotap header with a length we can use */
2201 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2203 /* does the skb contain enough to deliver on the alleged length? */
2204 if (unlikely(skb->len < len_rthdr))
2205 goto fail; /* skb too short for claimed rt header extent */
2208 * fix up the pointers accounting for the radiotap
2209 * header still being in there. We are being given
2210 * a precooked IEEE80211 header so no need for
2213 skb_set_mac_header(skb, len_rthdr);
2215 * these are just fixed to the end of the rt area since we
2216 * don't have any better information and at this point, nobody cares
2218 skb_set_network_header(skb, len_rthdr);
2219 skb_set_transport_header(skb, len_rthdr);
2221 if (skb->len < len_rthdr + 2)
2224 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2225 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2227 if (skb->len < len_rthdr + hdrlen)
2231 * Initialize skb->protocol if the injected frame is a data frame
2232 * carrying a rfc1042 header
2234 if (ieee80211_is_data(hdr->frame_control) &&
2235 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2236 u8 *payload = (u8 *)hdr + hdrlen;
2238 if (ether_addr_equal(payload, rfc1042_header))
2239 skb->protocol = cpu_to_be16((payload[6] << 8) |
2243 memset(info, 0, sizeof(*info));
2245 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2246 IEEE80211_TX_CTL_INJECTED;
2251 * We process outgoing injected frames that have a local address
2252 * we handle as though they are non-injected frames.
2253 * This code here isn't entirely correct, the local MAC address
2254 * isn't always enough to find the interface to use; for proper
2255 * VLAN/WDS support we will need a different mechanism (which
2256 * likely isn't going to be monitor interfaces).
2258 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2260 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2261 if (!ieee80211_sdata_running(tmp_sdata))
2263 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2264 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2265 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2267 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2273 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2274 if (!chanctx_conf) {
2275 tmp_sdata = rcu_dereference(local->monitor_sdata);
2278 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2282 chandef = &chanctx_conf->def;
2283 else if (!local->use_chanctx)
2284 chandef = &local->_oper_chandef;
2289 * Frame injection is not allowed if beaconing is not allowed
2290 * or if we need radar detection. Beaconing is usually not allowed when
2291 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2292 * Passive scan is also used in world regulatory domains where
2293 * your country is not known and as such it should be treated as
2294 * NO TX unless the channel is explicitly allowed in which case
2295 * your current regulatory domain would not have the passive scan
2298 * Since AP mode uses monitor interfaces to inject/TX management
2299 * frames we can make AP mode the exception to this rule once it
2300 * supports radar detection as its implementation can deal with
2301 * radar detection by itself. We can do that later by adding a
2302 * monitor flag interfaces used for AP support.
2304 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2308 info->band = chandef->chan->band;
2310 /* process and remove the injection radiotap header */
2311 if (!ieee80211_parse_tx_radiotap(local, skb))
2314 ieee80211_xmit(sdata, NULL, skb, 0);
2317 return NETDEV_TX_OK;
2323 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2326 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2328 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2330 return ethertype == ETH_P_TDLS &&
2332 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2335 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2336 struct sk_buff *skb,
2337 struct sta_info **sta_out)
2339 struct sta_info *sta;
2341 switch (sdata->vif.type) {
2342 case NL80211_IFTYPE_AP_VLAN:
2343 sta = rcu_dereference(sdata->u.vlan.sta);
2347 } else if (sdata->wdev.use_4addr) {
2351 case NL80211_IFTYPE_AP:
2352 case NL80211_IFTYPE_OCB:
2353 case NL80211_IFTYPE_ADHOC:
2354 if (is_multicast_ether_addr(skb->data)) {
2355 *sta_out = ERR_PTR(-ENOENT);
2358 sta = sta_info_get_bss(sdata, skb->data);
2360 case NL80211_IFTYPE_WDS:
2361 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2363 #ifdef CONFIG_MAC80211_MESH
2364 case NL80211_IFTYPE_MESH_POINT:
2365 /* determined much later */
2369 case NL80211_IFTYPE_STATION:
2370 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2371 sta = sta_info_get(sdata, skb->data);
2372 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2373 if (test_sta_flag(sta,
2374 WLAN_STA_TDLS_PEER_AUTH)) {
2380 * TDLS link during setup - throw out frames to
2381 * peer. Allow TDLS-setup frames to unauthorized
2382 * peers for the special case of a link teardown
2383 * after a TDLS sta is removed due to being
2386 if (!ieee80211_is_tdls_setup(skb))
2392 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2400 *sta_out = sta ?: ERR_PTR(-ENOENT);
2405 * ieee80211_build_hdr - build 802.11 header in the given frame
2406 * @sdata: virtual interface to build the header for
2407 * @skb: the skb to build the header in
2408 * @info_flags: skb flags to set
2410 * This function takes the skb with 802.3 header and reformats the header to
2411 * the appropriate IEEE 802.11 header based on which interface the packet is
2412 * being transmitted on.
2414 * Note that this function also takes care of the TX status request and
2415 * potential unsharing of the SKB - this needs to be interleaved with the
2418 * The function requires the read-side RCU lock held
2420 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2422 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2423 struct sk_buff *skb, u32 info_flags,
2424 struct sta_info *sta)
2426 struct ieee80211_local *local = sdata->local;
2427 struct ieee80211_tx_info *info;
2429 u16 ethertype, hdrlen, meshhdrlen = 0;
2431 struct ieee80211_hdr hdr;
2432 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2433 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2434 const u8 *encaps_data;
2435 int encaps_len, skip_header_bytes;
2436 bool wme_sta = false, authorized = false;
2440 struct ieee80211_chanctx_conf *chanctx_conf;
2441 struct ieee80211_sub_if_data *ap_sdata;
2442 enum nl80211_band band;
2448 /* convert Ethernet header to proper 802.11 header (based on
2449 * operation mode) */
2450 ethertype = (skb->data[12] << 8) | skb->data[13];
2451 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2453 switch (sdata->vif.type) {
2454 case NL80211_IFTYPE_AP_VLAN:
2455 if (sdata->wdev.use_4addr) {
2456 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2458 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2459 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2460 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2461 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2463 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2464 wme_sta = sta->sta.wme;
2466 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2468 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2469 if (!chanctx_conf) {
2473 band = chanctx_conf->def.chan->band;
2474 if (sdata->wdev.use_4addr)
2477 case NL80211_IFTYPE_AP:
2478 if (sdata->vif.type == NL80211_IFTYPE_AP)
2479 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2480 if (!chanctx_conf) {
2484 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2486 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2487 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2488 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2490 band = chanctx_conf->def.chan->band;
2492 case NL80211_IFTYPE_WDS:
2493 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2495 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2496 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2497 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2498 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2501 * This is the exception! WDS style interfaces are prohibited
2502 * when channel contexts are in used so this must be valid
2504 band = local->hw.conf.chandef.chan->band;
2506 #ifdef CONFIG_MAC80211_MESH
2507 case NL80211_IFTYPE_MESH_POINT:
2508 if (!is_multicast_ether_addr(skb->data)) {
2509 struct sta_info *next_hop;
2510 bool mpp_lookup = true;
2512 mpath = mesh_path_lookup(sdata, skb->data);
2515 next_hop = rcu_dereference(mpath->next_hop);
2517 !(mpath->flags & (MESH_PATH_ACTIVE |
2518 MESH_PATH_RESOLVING)))
2523 mppath = mpp_path_lookup(sdata, skb->data);
2525 mppath->exp_time = jiffies;
2528 if (mppath && mpath)
2529 mesh_path_del(sdata, mpath->dst);
2533 * Use address extension if it is a packet from
2534 * another interface or if we know the destination
2535 * is being proxied by a portal (i.e. portal address
2536 * differs from proxied address)
2538 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2539 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2540 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2541 skb->data, skb->data + ETH_ALEN);
2542 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2545 /* DS -> MBSS (802.11-2012 13.11.3.3).
2546 * For unicast with unknown forwarding information,
2547 * destination might be in the MBSS or if that fails
2548 * forwarded to another mesh gate. In either case
2549 * resolution will be handled in ieee80211_xmit(), so
2550 * leave the original DA. This also works for mcast */
2551 const u8 *mesh_da = skb->data;
2554 mesh_da = mppath->mpp;
2556 mesh_da = mpath->dst;
2558 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2559 mesh_da, sdata->vif.addr);
2560 if (is_multicast_ether_addr(mesh_da))
2561 /* DA TA mSA AE:SA */
2562 meshhdrlen = ieee80211_new_mesh_header(
2564 skb->data + ETH_ALEN, NULL);
2566 /* RA TA mDA mSA AE:DA SA */
2567 meshhdrlen = ieee80211_new_mesh_header(
2568 sdata, &mesh_hdr, skb->data,
2569 skb->data + ETH_ALEN);
2572 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2573 if (!chanctx_conf) {
2577 band = chanctx_conf->def.chan->band;
2580 case NL80211_IFTYPE_STATION:
2581 /* we already did checks when looking up the RA STA */
2582 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2586 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2587 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2588 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2590 } else if (sdata->u.mgd.use_4addr &&
2591 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2592 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2593 IEEE80211_FCTL_TODS);
2595 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2596 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2597 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2598 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2601 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2603 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2604 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2605 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2608 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2609 if (!chanctx_conf) {
2613 band = chanctx_conf->def.chan->band;
2615 case NL80211_IFTYPE_OCB:
2617 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2618 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2619 eth_broadcast_addr(hdr.addr3);
2621 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2622 if (!chanctx_conf) {
2626 band = chanctx_conf->def.chan->band;
2628 case NL80211_IFTYPE_ADHOC:
2630 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2631 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2632 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2634 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2635 if (!chanctx_conf) {
2639 band = chanctx_conf->def.chan->band;
2646 multicast = is_multicast_ether_addr(hdr.addr1);
2648 /* sta is always NULL for mesh */
2650 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2651 wme_sta = sta->sta.wme;
2652 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2653 /* For mesh, the use of the QoS header is mandatory */
2657 /* receiver does QoS (which also means we do) use it */
2659 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2664 * Drop unicast frames to unauthorised stations unless they are
2665 * EAPOL frames from the local station.
2667 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2668 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2669 !multicast && !authorized &&
2670 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2671 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2672 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2673 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2674 sdata->name, hdr.addr1);
2677 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2683 if (unlikely(!multicast && skb->sk &&
2684 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2685 struct sk_buff *ack_skb = skb_clone_sk(skb);
2688 unsigned long flags;
2691 spin_lock_irqsave(&local->ack_status_lock, flags);
2692 id = idr_alloc(&local->ack_status_frames, ack_skb,
2693 1, 0x10000, GFP_ATOMIC);
2694 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2698 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2706 * If the skb is shared we need to obtain our own copy.
2708 if (skb_shared(skb)) {
2709 struct sk_buff *tmp_skb = skb;
2711 /* can't happen -- skb is a clone if info_id != 0 */
2714 skb = skb_clone(skb, GFP_ATOMIC);
2723 hdr.frame_control = fc;
2724 hdr.duration_id = 0;
2727 skip_header_bytes = ETH_HLEN;
2728 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2729 encaps_data = bridge_tunnel_header;
2730 encaps_len = sizeof(bridge_tunnel_header);
2731 skip_header_bytes -= 2;
2732 } else if (ethertype >= ETH_P_802_3_MIN) {
2733 encaps_data = rfc1042_header;
2734 encaps_len = sizeof(rfc1042_header);
2735 skip_header_bytes -= 2;
2741 skb_pull(skb, skip_header_bytes);
2742 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2745 * So we need to modify the skb header and hence need a copy of
2746 * that. The head_need variable above doesn't, so far, include
2747 * the needed header space that we don't need right away. If we
2748 * can, then we don't reallocate right now but only after the
2749 * frame arrives at the master device (if it does...)
2751 * If we cannot, however, then we will reallocate to include all
2752 * the ever needed space. Also, if we need to reallocate it anyway,
2753 * make it big enough for everything we may ever need.
2756 if (head_need > 0 || skb_cloned(skb)) {
2757 head_need += sdata->encrypt_headroom;
2758 head_need += local->tx_headroom;
2759 head_need = max_t(int, 0, head_need);
2760 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2761 ieee80211_free_txskb(&local->hw, skb);
2763 return ERR_PTR(-ENOMEM);
2768 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2770 #ifdef CONFIG_MAC80211_MESH
2772 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2775 if (ieee80211_is_data_qos(fc)) {
2776 __le16 *qos_control;
2778 qos_control = skb_push(skb, 2);
2779 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2781 * Maybe we could actually set some fields here, for now just
2782 * initialise to zero to indicate no special operation.
2786 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2788 skb_reset_mac_header(skb);
2790 info = IEEE80211_SKB_CB(skb);
2791 memset(info, 0, sizeof(*info));
2793 info->flags = info_flags;
2794 info->ack_frame_id = info_id;
2800 return ERR_PTR(ret);
2804 * fast-xmit overview
2806 * The core idea of this fast-xmit is to remove per-packet checks by checking
2807 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2808 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2809 * much less work can be done per packet. For example, fragmentation must be
2810 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2813 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2814 * header and other data to aid packet processing in ieee80211_xmit_fast().
2816 * The most difficult part of this is that when any of these assumptions
2817 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2818 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2819 * since the per-packet code no longer checks the conditions. This is reflected
2820 * by the calls to these functions throughout the rest of the code, and must be
2821 * maintained if any of the TX path checks change.
2824 void ieee80211_check_fast_xmit(struct sta_info *sta)
2826 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2827 struct ieee80211_local *local = sta->local;
2828 struct ieee80211_sub_if_data *sdata = sta->sdata;
2829 struct ieee80211_hdr *hdr = (void *)build.hdr;
2830 struct ieee80211_chanctx_conf *chanctx_conf;
2833 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2836 /* Locking here protects both the pointer itself, and against concurrent
2837 * invocations winning data access races to, e.g., the key pointer that
2839 * Without it, the invocation of this function right after the key
2840 * pointer changes wouldn't be sufficient, as another CPU could access
2841 * the pointer, then stall, and then do the cache update after the CPU
2842 * that invalidated the key.
2843 * With the locking, such scenarios cannot happen as the check for the
2844 * key and the fast-tx assignment are done atomically, so the CPU that
2845 * modifies the key will either wait or other one will see the key
2846 * cleared/changed already.
2848 spin_lock_bh(&sta->lock);
2849 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2850 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2851 sdata->vif.type == NL80211_IFTYPE_STATION)
2854 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2857 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2858 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2859 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2860 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2863 if (sdata->noack_map)
2866 /* fast-xmit doesn't handle fragmentation at all */
2867 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2868 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2872 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2873 if (!chanctx_conf) {
2877 build.band = chanctx_conf->def.chan->band;
2880 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2882 switch (sdata->vif.type) {
2883 case NL80211_IFTYPE_ADHOC:
2885 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2886 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2887 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2890 case NL80211_IFTYPE_STATION:
2891 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2893 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2894 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2895 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2900 if (sdata->u.mgd.use_4addr) {
2901 /* non-regular ethertype cannot use the fastpath */
2902 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2903 IEEE80211_FCTL_TODS);
2905 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2906 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2907 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2908 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2912 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2914 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2915 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2916 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2919 case NL80211_IFTYPE_AP_VLAN:
2920 if (sdata->wdev.use_4addr) {
2921 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2922 IEEE80211_FCTL_TODS);
2924 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2925 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2926 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2927 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2932 case NL80211_IFTYPE_AP:
2933 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2935 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2936 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2937 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2941 /* not handled on fast-xmit */
2947 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2950 /* We store the key here so there's no point in using rcu_dereference()
2951 * but that's fine because the code that changes the pointers will call
2952 * this function after doing so. For a single CPU that would be enough,
2953 * for multiple see the comment above.
2955 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2957 build.key = rcu_access_pointer(sdata->default_unicast_key);
2959 bool gen_iv, iv_spc, mmic;
2961 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2962 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2963 mmic = build.key->conf.flags &
2964 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
2965 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
2967 /* don't handle software crypto */
2968 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2971 switch (build.key->conf.cipher) {
2972 case WLAN_CIPHER_SUITE_CCMP:
2973 case WLAN_CIPHER_SUITE_CCMP_256:
2974 /* add fixed key ID */
2976 (build.hdr + build.hdr_len)[3] =
2977 0x20 | (build.key->conf.keyidx << 6);
2978 build.pn_offs = build.hdr_len;
2980 if (gen_iv || iv_spc)
2981 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2983 case WLAN_CIPHER_SUITE_GCMP:
2984 case WLAN_CIPHER_SUITE_GCMP_256:
2985 /* add fixed key ID */
2987 (build.hdr + build.hdr_len)[3] =
2988 0x20 | (build.key->conf.keyidx << 6);
2989 build.pn_offs = build.hdr_len;
2991 if (gen_iv || iv_spc)
2992 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2994 case WLAN_CIPHER_SUITE_TKIP:
2995 /* cannot handle MMIC or IV generation in xmit-fast */
2999 build.hdr_len += IEEE80211_TKIP_IV_LEN;
3001 case WLAN_CIPHER_SUITE_WEP40:
3002 case WLAN_CIPHER_SUITE_WEP104:
3003 /* cannot handle IV generation in fast-xmit */
3007 build.hdr_len += IEEE80211_WEP_IV_LEN;
3009 case WLAN_CIPHER_SUITE_AES_CMAC:
3010 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3011 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3012 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3014 "management cipher suite 0x%x enabled for data\n",
3015 build.key->conf.cipher);
3018 /* we don't know how to generate IVs for this at all */
3019 if (WARN_ON(gen_iv))
3021 /* pure hardware keys are OK, of course */
3022 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
3024 /* cipher scheme might require space allocation */
3026 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
3029 build.hdr_len += build.key->conf.iv_len;
3032 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3035 hdr->frame_control = fc;
3037 memcpy(build.hdr + build.hdr_len,
3038 rfc1042_header, sizeof(rfc1042_header));
3039 build.hdr_len += sizeof(rfc1042_header);
3041 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3042 /* if the kmemdup fails, continue w/o fast_tx */
3047 /* we might have raced against another call to this function */
3048 old = rcu_dereference_protected(sta->fast_tx,
3049 lockdep_is_held(&sta->lock));
3050 rcu_assign_pointer(sta->fast_tx, fast_tx);
3052 kfree_rcu(old, rcu_head);
3053 spin_unlock_bh(&sta->lock);
3056 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3058 struct sta_info *sta;
3061 list_for_each_entry_rcu(sta, &local->sta_list, list)
3062 ieee80211_check_fast_xmit(sta);
3066 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3068 struct ieee80211_local *local = sdata->local;
3069 struct sta_info *sta;
3073 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3074 if (sdata != sta->sdata &&
3075 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3077 ieee80211_check_fast_xmit(sta);
3083 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3085 struct ieee80211_fast_tx *fast_tx;
3087 spin_lock_bh(&sta->lock);
3088 fast_tx = rcu_dereference_protected(sta->fast_tx,
3089 lockdep_is_held(&sta->lock));
3090 RCU_INIT_POINTER(sta->fast_tx, NULL);
3091 spin_unlock_bh(&sta->lock);
3094 kfree_rcu(fast_tx, rcu_head);
3097 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3098 struct sk_buff *skb, int headroom)
3100 if (skb_headroom(skb) < headroom) {
3101 I802_DEBUG_INC(local->tx_expand_skb_head);
3103 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3104 wiphy_debug(local->hw.wiphy,
3105 "failed to reallocate TX buffer\n");
3113 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3114 struct ieee80211_fast_tx *fast_tx,
3115 struct sk_buff *skb)
3117 struct ieee80211_local *local = sdata->local;
3118 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3119 struct ieee80211_hdr *hdr;
3120 struct ethhdr *amsdu_hdr;
3121 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3122 int subframe_len = skb->len - hdr_len;
3124 u8 *qc, *h_80211_src, *h_80211_dst;
3127 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3130 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3133 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr)))
3136 data = skb_push(skb, sizeof(*amsdu_hdr));
3137 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3139 amsdu_hdr = data + hdr_len;
3140 /* h_80211_src/dst is addr* field within hdr */
3141 h_80211_src = data + fast_tx->sa_offs;
3142 h_80211_dst = data + fast_tx->da_offs;
3144 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3145 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3146 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3148 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3149 * fields needs to be changed to BSSID for A-MSDU frames depending
3150 * on FromDS/ToDS values.
3152 switch (sdata->vif.type) {
3153 case NL80211_IFTYPE_STATION:
3154 bssid = sdata->u.mgd.bssid;
3156 case NL80211_IFTYPE_AP:
3157 case NL80211_IFTYPE_AP_VLAN:
3158 bssid = sdata->vif.addr;
3164 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3165 ether_addr_copy(h_80211_src, bssid);
3167 if (bssid && ieee80211_has_tods(hdr->frame_control))
3168 ether_addr_copy(h_80211_dst, bssid);
3170 qc = ieee80211_get_qos_ctl(hdr);
3171 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3173 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3178 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3179 struct sta_info *sta,
3180 struct ieee80211_fast_tx *fast_tx,
3181 struct sk_buff *skb)
3183 struct ieee80211_local *local = sdata->local;
3184 struct fq *fq = &local->fq;
3186 struct fq_flow *flow;
3187 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3188 struct ieee80211_txq *txq = sta->sta.txq[tid];
3189 struct txq_info *txqi;
3190 struct sk_buff **frag_tail, *head;
3191 int subframe_len = skb->len - ETH_ALEN;
3192 u8 max_subframes = sta->sta.max_amsdu_subframes;
3193 int max_frags = local->hw.max_tx_fragments;
3194 int max_amsdu_len = sta->sta.max_amsdu_len;
3198 unsigned int orig_len;
3199 int n = 2, nfrags, pad = 0;
3202 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3208 txqi = to_txq_info(txq);
3209 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3212 if (sta->sta.max_rc_amsdu_len)
3213 max_amsdu_len = min_t(int, max_amsdu_len,
3214 sta->sta.max_rc_amsdu_len);
3216 spin_lock_bh(&fq->lock);
3218 /* TODO: Ideally aggregation should be done on dequeue to remain
3219 * responsive to environment changes.
3223 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3224 head = skb_peek_tail(&flow->queue);
3228 orig_len = head->len;
3230 if (skb->len + head->len > max_amsdu_len)
3233 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3234 nfrags += 1 + skb_shinfo(head)->nr_frags;
3235 frag_tail = &skb_shinfo(head)->frag_list;
3236 while (*frag_tail) {
3237 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3238 frag_tail = &(*frag_tail)->next;
3242 if (max_subframes && n > max_subframes)
3245 if (max_frags && nfrags > max_frags)
3248 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3252 * Pad out the previous subframe to a multiple of 4 by adding the
3253 * padding to the next one, that's being added. Note that head->len
3254 * is the length of the full A-MSDU, but that works since each time
3255 * we add a new subframe we pad out the previous one to a multiple
3256 * of 4 and thus it no longer matters in the next round.
3258 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3259 if ((head->len - hdrlen) & 3)
3260 pad = 4 - ((head->len - hdrlen) & 3);
3262 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3267 data = skb_push(skb, ETH_ALEN + 2);
3268 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3270 data += 2 * ETH_ALEN;
3271 len = cpu_to_be16(subframe_len);
3272 memcpy(data, &len, 2);
3273 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3275 memset(skb_push(skb, pad), 0, pad);
3277 head->len += skb->len;
3278 head->data_len += skb->len;
3282 if (head->len != orig_len) {
3283 flow->backlog += head->len - orig_len;
3284 tin->backlog_bytes += head->len - orig_len;
3286 fq_recalc_backlog(fq, tin, flow);
3289 spin_unlock_bh(&fq->lock);
3295 * Can be called while the sta lock is held. Anything that can cause packets to
3296 * be generated will cause deadlock!
3298 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3299 struct sta_info *sta, u8 pn_offs,
3300 struct ieee80211_key *key,
3301 struct sk_buff *skb)
3303 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3304 struct ieee80211_hdr *hdr = (void *)skb->data;
3305 u8 tid = IEEE80211_NUM_TIDS;
3308 info->control.hw_key = &key->conf;
3310 ieee80211_tx_stats(skb->dev, skb->len);
3312 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3313 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3314 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3316 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3317 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3318 sdata->sequence_number += 0x10;
3321 if (skb_shinfo(skb)->gso_size)
3322 sta->tx_stats.msdu[tid] +=
3323 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3325 sta->tx_stats.msdu[tid]++;
3327 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3329 /* statistics normally done by ieee80211_tx_h_stats (but that
3330 * has to consider fragmentation, so is more complex)
3332 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3333 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3337 u8 *crypto_hdr = skb->data + pn_offs;
3339 switch (key->conf.cipher) {
3340 case WLAN_CIPHER_SUITE_CCMP:
3341 case WLAN_CIPHER_SUITE_CCMP_256:
3342 case WLAN_CIPHER_SUITE_GCMP:
3343 case WLAN_CIPHER_SUITE_GCMP_256:
3344 pn = atomic64_inc_return(&key->conf.tx_pn);
3346 crypto_hdr[1] = pn >> 8;
3347 crypto_hdr[4] = pn >> 16;
3348 crypto_hdr[5] = pn >> 24;
3349 crypto_hdr[6] = pn >> 32;
3350 crypto_hdr[7] = pn >> 40;
3356 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3357 struct sta_info *sta,
3358 struct ieee80211_fast_tx *fast_tx,
3359 struct sk_buff *skb)
3361 struct ieee80211_local *local = sdata->local;
3362 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3363 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3364 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3366 struct ieee80211_tx_info *info;
3367 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3368 struct ieee80211_tx_data tx;
3369 ieee80211_tx_result r;
3370 struct tid_ampdu_tx *tid_tx = NULL;
3371 u8 tid = IEEE80211_NUM_TIDS;
3373 /* control port protocol needs a lot of special handling */
3374 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3377 /* only RFC 1042 SNAP */
3378 if (ethertype < ETH_P_802_3_MIN)
3381 /* don't handle TX status request here either */
3382 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3385 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3386 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3387 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3389 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3391 if (tid_tx->timeout)
3392 tid_tx->last_tx = jiffies;
3396 /* after this point (skb is modified) we cannot return false */
3398 if (skb_shared(skb)) {
3399 struct sk_buff *tmp_skb = skb;
3401 skb = skb_clone(skb, GFP_ATOMIC);
3408 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3409 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3412 /* will not be crypto-handled beyond what we do here, so use false
3413 * as the may-encrypt argument for the resize to not account for
3414 * more room than we already have in 'extra_head'
3416 if (unlikely(ieee80211_skb_resize(sdata, skb,
3417 max_t(int, extra_head + hw_headroom -
3418 skb_headroom(skb), 0),
3424 memcpy(ð, skb->data, ETH_HLEN - 2);
3425 hdr = skb_push(skb, extra_head);
3426 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3427 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3428 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3430 info = IEEE80211_SKB_CB(skb);
3431 memset(info, 0, sizeof(*info));
3432 info->band = fast_tx->band;
3433 info->control.vif = &sdata->vif;
3434 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3435 IEEE80211_TX_CTL_DONTFRAG |
3436 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3437 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3439 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3440 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3441 *ieee80211_get_qos_ctl(hdr) = tid;
3444 __skb_queue_head_init(&tx.skbs);
3446 tx.flags = IEEE80211_TX_UNICAST;
3450 tx.key = fast_tx->key;
3452 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3454 r = ieee80211_tx_h_rate_ctrl(&tx);
3458 if (r != TX_CONTINUE) {
3465 if (ieee80211_queue_skb(local, sdata, sta, skb))
3468 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3471 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3472 sdata = container_of(sdata->bss,
3473 struct ieee80211_sub_if_data, u.ap);
3475 __skb_queue_tail(&tx.skbs, skb);
3476 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3480 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3481 struct ieee80211_txq *txq)
3483 struct ieee80211_local *local = hw_to_local(hw);
3484 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3485 struct ieee80211_hdr *hdr;
3486 struct sk_buff *skb = NULL;
3487 struct fq *fq = &local->fq;
3488 struct fq_tin *tin = &txqi->tin;
3489 struct ieee80211_tx_info *info;
3490 struct ieee80211_tx_data tx;
3491 ieee80211_tx_result r;
3492 struct ieee80211_vif *vif = txq->vif;
3494 spin_lock_bh(&fq->lock);
3496 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ||
3497 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags))
3500 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) {
3501 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags);
3505 /* Make sure fragments stay together. */
3506 skb = __skb_dequeue(&txqi->frags);
3511 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3515 hdr = (struct ieee80211_hdr *)skb->data;
3516 info = IEEE80211_SKB_CB(skb);
3518 memset(&tx, 0, sizeof(tx));
3519 __skb_queue_head_init(&tx.skbs);
3522 tx.sdata = vif_to_sdata(info->control.vif);
3525 tx.sta = container_of(txq->sta, struct sta_info, sta);
3528 * The key can be removed while the packet was queued, so need to call
3529 * this here to get the current key.
3531 r = ieee80211_tx_h_select_key(&tx);
3532 if (r != TX_CONTINUE) {
3533 ieee80211_free_txskb(&local->hw, skb);
3537 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3538 info->flags |= IEEE80211_TX_CTL_AMPDU;
3540 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3542 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3543 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3548 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3549 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3551 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3554 if (invoke_tx_handlers_late(&tx))
3557 skb = __skb_dequeue(&tx.skbs);
3559 if (!skb_queue_empty(&tx.skbs))
3560 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3563 if (skb && skb_has_frag_list(skb) &&
3564 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3565 if (skb_linearize(skb)) {
3566 ieee80211_free_txskb(&local->hw, skb);
3571 switch (tx.sdata->vif.type) {
3572 case NL80211_IFTYPE_MONITOR:
3573 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3574 vif = &tx.sdata->vif;
3577 tx.sdata = rcu_dereference(local->monitor_sdata);
3579 vif = &tx.sdata->vif;
3581 vif->hw_queue[skb_get_queue_mapping(skb)];
3582 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3583 ieee80211_free_txskb(&local->hw, skb);
3589 case NL80211_IFTYPE_AP_VLAN:
3590 tx.sdata = container_of(tx.sdata->bss,
3591 struct ieee80211_sub_if_data, u.ap);
3594 vif = &tx.sdata->vif;
3598 IEEE80211_SKB_CB(skb)->control.vif = vif;
3601 spin_unlock_bh(&fq->lock);
3605 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3607 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3608 struct net_device *dev,
3611 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3612 struct sta_info *sta;
3613 struct sk_buff *next;
3615 if (unlikely(skb->len < ETH_HLEN)) {
3622 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3625 if (!IS_ERR_OR_NULL(sta)) {
3626 struct ieee80211_fast_tx *fast_tx;
3628 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
3630 fast_tx = rcu_dereference(sta->fast_tx);
3633 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3637 if (skb_is_gso(skb)) {
3638 struct sk_buff *segs;
3640 segs = skb_gso_segment(skb, 0);
3648 /* we cannot process non-linear frames on this path */
3649 if (skb_linearize(skb)) {
3654 /* the frame could be fragmented, software-encrypted, and other
3655 * things so we cannot really handle checksum offload with it -
3656 * fix it up in software before we handle anything else.
3658 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3659 skb_set_transport_header(skb,
3660 skb_checksum_start_offset(skb));
3661 if (skb_checksum_help(skb))
3674 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3678 ieee80211_tx_stats(dev, skb->len);
3680 ieee80211_xmit(sdata, sta, skb, 0);
3689 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3694 err = skb_ensure_writable(skb, ETH_HLEN);
3698 eth = (void *)skb->data;
3699 ether_addr_copy(eth->h_dest, sta->sta.addr);
3704 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3705 struct net_device *dev)
3707 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3708 const struct ethhdr *eth = (void *)skb->data;
3709 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3712 if (likely(!is_multicast_ether_addr(eth->h_dest)))
3715 switch (sdata->vif.type) {
3716 case NL80211_IFTYPE_AP_VLAN:
3717 if (sdata->u.vlan.sta)
3719 if (sdata->wdev.use_4addr)
3722 case NL80211_IFTYPE_AP:
3723 /* check runtime toggle for this bss */
3724 if (!sdata->bss->multicast_to_unicast)
3731 /* multicast to unicast conversion only for some payload */
3732 ethertype = eth->h_proto;
3733 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3734 ethertype = ethvlan->h_vlan_encapsulated_proto;
3735 switch (ethertype) {
3736 case htons(ETH_P_ARP):
3737 case htons(ETH_P_IP):
3738 case htons(ETH_P_IPV6):
3748 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3749 struct sk_buff_head *queue)
3751 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3752 struct ieee80211_local *local = sdata->local;
3753 const struct ethhdr *eth = (struct ethhdr *)skb->data;
3754 struct sta_info *sta, *first = NULL;
3755 struct sk_buff *cloned_skb;
3759 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3760 if (sdata != sta->sdata)
3761 /* AP-VLAN mismatch */
3763 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3764 /* do not send back to source */
3770 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3773 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3774 dev_kfree_skb(cloned_skb);
3777 __skb_queue_tail(queue, cloned_skb);
3780 if (likely(first)) {
3781 if (unlikely(ieee80211_change_da(skb, first)))
3783 __skb_queue_tail(queue, skb);
3785 /* no STA connected, drop */
3792 __skb_queue_purge(queue);
3793 __skb_queue_tail(queue, skb);
3799 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3800 * @skb: packet to be sent
3801 * @dev: incoming interface
3803 * On failure skb will be freed.
3805 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3806 struct net_device *dev)
3808 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3809 struct sk_buff_head queue;
3811 __skb_queue_head_init(&queue);
3812 ieee80211_convert_to_unicast(skb, dev, &queue);
3813 while ((skb = __skb_dequeue(&queue)))
3814 __ieee80211_subif_start_xmit(skb, dev, 0);
3816 __ieee80211_subif_start_xmit(skb, dev, 0);
3819 return NETDEV_TX_OK;
3823 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3824 struct sk_buff *skb, u32 info_flags)
3826 struct ieee80211_hdr *hdr;
3827 struct ieee80211_tx_data tx = {
3828 .local = sdata->local,
3831 struct sta_info *sta;
3835 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3837 skb = ERR_PTR(-EINVAL);
3841 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3845 hdr = (void *)skb->data;
3846 tx.sta = sta_info_get(sdata, hdr->addr1);
3849 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3852 return ERR_PTR(-EINVAL);
3861 * ieee80211_clear_tx_pending may not be called in a context where
3862 * it is possible that it packets could come in again.
3864 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3866 struct sk_buff *skb;
3869 for (i = 0; i < local->hw.queues; i++) {
3870 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3871 ieee80211_free_txskb(&local->hw, skb);
3876 * Returns false if the frame couldn't be transmitted but was queued instead,
3877 * which in this case means re-queued -- take as an indication to stop sending
3878 * more pending frames.
3880 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3881 struct sk_buff *skb)
3883 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3884 struct ieee80211_sub_if_data *sdata;
3885 struct sta_info *sta;
3886 struct ieee80211_hdr *hdr;
3888 struct ieee80211_chanctx_conf *chanctx_conf;
3890 sdata = vif_to_sdata(info->control.vif);
3892 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3893 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3894 if (unlikely(!chanctx_conf)) {
3898 info->band = chanctx_conf->def.chan->band;
3899 result = ieee80211_tx(sdata, NULL, skb, true, 0);
3901 struct sk_buff_head skbs;
3903 __skb_queue_head_init(&skbs);
3904 __skb_queue_tail(&skbs, skb);
3906 hdr = (struct ieee80211_hdr *)skb->data;
3907 sta = sta_info_get(sdata, hdr->addr1);
3909 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3916 * Transmit all pending packets. Called from tasklet.
3918 void ieee80211_tx_pending(unsigned long data)
3920 struct ieee80211_local *local = (struct ieee80211_local *)data;
3921 unsigned long flags;
3927 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3928 for (i = 0; i < local->hw.queues; i++) {
3930 * If queue is stopped by something other than due to pending
3931 * frames, or we have no pending frames, proceed to next queue.
3933 if (local->queue_stop_reasons[i] ||
3934 skb_queue_empty(&local->pending[i]))
3937 while (!skb_queue_empty(&local->pending[i])) {
3938 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3939 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3941 if (WARN_ON(!info->control.vif)) {
3942 ieee80211_free_txskb(&local->hw, skb);
3946 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3949 txok = ieee80211_tx_pending_skb(local, skb);
3950 spin_lock_irqsave(&local->queue_stop_reason_lock,
3956 if (skb_queue_empty(&local->pending[i]))
3957 ieee80211_propagate_queue_wake(local, i);
3959 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3964 /* functions for drivers to get certain frames */
3966 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3967 struct ps_data *ps, struct sk_buff *skb,
3972 int i, have_bits = 0, n1, n2;
3974 /* Generate bitmap for TIM only if there are any STAs in power save
3976 if (atomic_read(&ps->num_sta_ps) > 0)
3977 /* in the hope that this is faster than
3978 * checking byte-for-byte */
3979 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3980 IEEE80211_MAX_AID+1);
3982 if (ps->dtim_count == 0)
3983 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3988 tim = pos = skb_put(skb, 6);
3989 *pos++ = WLAN_EID_TIM;
3991 *pos++ = ps->dtim_count;
3992 *pos++ = sdata->vif.bss_conf.dtim_period;
3994 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3997 ps->dtim_bc_mc = aid0 == 1;
4000 /* Find largest even number N1 so that bits numbered 1 through
4001 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4002 * (N2 + 1) x 8 through 2007 are 0. */
4004 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4011 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4018 /* Bitmap control */
4020 /* Part Virt Bitmap */
4021 skb_put(skb, n2 - n1);
4022 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
4024 tim[1] = n2 - n1 + 4;
4026 *pos++ = aid0; /* Bitmap control */
4027 *pos++ = 0; /* Part Virt Bitmap */
4031 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4032 struct ps_data *ps, struct sk_buff *skb,
4035 struct ieee80211_local *local = sdata->local;
4038 * Not very nice, but we want to allow the driver to call
4039 * ieee80211_beacon_get() as a response to the set_tim()
4040 * callback. That, however, is already invoked under the
4041 * sta_lock to guarantee consistent and race-free update
4042 * of the tim bitmap in mac80211 and the driver.
4044 if (local->tim_in_locked_section) {
4045 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4047 spin_lock_bh(&local->tim_lock);
4048 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4049 spin_unlock_bh(&local->tim_lock);
4055 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
4056 struct beacon_data *beacon)
4058 struct probe_resp *resp;
4060 size_t beacon_data_len;
4062 u8 count = beacon->csa_current_counter;
4064 switch (sdata->vif.type) {
4065 case NL80211_IFTYPE_AP:
4066 beacon_data = beacon->tail;
4067 beacon_data_len = beacon->tail_len;
4069 case NL80211_IFTYPE_ADHOC:
4070 beacon_data = beacon->head;
4071 beacon_data_len = beacon->head_len;
4073 case NL80211_IFTYPE_MESH_POINT:
4074 beacon_data = beacon->head;
4075 beacon_data_len = beacon->head_len;
4082 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
4083 resp = rcu_dereference(sdata->u.ap.probe_resp);
4085 if (beacon->csa_counter_offsets[i]) {
4086 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
4092 beacon_data[beacon->csa_counter_offsets[i]] = count;
4095 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
4096 resp->data[resp->csa_counter_offsets[i]] = count;
4101 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
4103 beacon->csa_current_counter--;
4105 /* the counter should never reach 0 */
4106 WARN_ON_ONCE(!beacon->csa_current_counter);
4108 return beacon->csa_current_counter;
4111 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4113 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4114 struct beacon_data *beacon = NULL;
4119 if (sdata->vif.type == NL80211_IFTYPE_AP)
4120 beacon = rcu_dereference(sdata->u.ap.beacon);
4121 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4122 beacon = rcu_dereference(sdata->u.ibss.presp);
4123 else if (ieee80211_vif_is_mesh(&sdata->vif))
4124 beacon = rcu_dereference(sdata->u.mesh.beacon);
4129 count = __ieee80211_csa_update_counter(beacon);
4135 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4137 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter)
4139 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4140 struct beacon_data *beacon = NULL;
4144 if (sdata->vif.type == NL80211_IFTYPE_AP)
4145 beacon = rcu_dereference(sdata->u.ap.beacon);
4146 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4147 beacon = rcu_dereference(sdata->u.ibss.presp);
4148 else if (ieee80211_vif_is_mesh(&sdata->vif))
4149 beacon = rcu_dereference(sdata->u.mesh.beacon);
4154 if (counter < beacon->csa_current_counter)
4155 beacon->csa_current_counter = counter;
4160 EXPORT_SYMBOL(ieee80211_csa_set_counter);
4162 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4164 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4165 struct beacon_data *beacon = NULL;
4167 size_t beacon_data_len;
4170 if (!ieee80211_sdata_running(sdata))
4174 if (vif->type == NL80211_IFTYPE_AP) {
4175 struct ieee80211_if_ap *ap = &sdata->u.ap;
4177 beacon = rcu_dereference(ap->beacon);
4178 if (WARN_ON(!beacon || !beacon->tail))
4180 beacon_data = beacon->tail;
4181 beacon_data_len = beacon->tail_len;
4182 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4183 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4185 beacon = rcu_dereference(ifibss->presp);
4189 beacon_data = beacon->head;
4190 beacon_data_len = beacon->head_len;
4191 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4192 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4194 beacon = rcu_dereference(ifmsh->beacon);
4198 beacon_data = beacon->head;
4199 beacon_data_len = beacon->head_len;
4205 if (!beacon->csa_counter_offsets[0])
4208 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4211 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4218 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4220 static struct sk_buff *
4221 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4222 struct ieee80211_vif *vif,
4223 struct ieee80211_mutable_offsets *offs,
4226 struct ieee80211_local *local = hw_to_local(hw);
4227 struct beacon_data *beacon = NULL;
4228 struct sk_buff *skb = NULL;
4229 struct ieee80211_tx_info *info;
4230 struct ieee80211_sub_if_data *sdata = NULL;
4231 enum nl80211_band band;
4232 struct ieee80211_tx_rate_control txrc;
4233 struct ieee80211_chanctx_conf *chanctx_conf;
4234 int csa_off_base = 0;
4238 sdata = vif_to_sdata(vif);
4239 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4241 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4245 memset(offs, 0, sizeof(*offs));
4247 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4248 struct ieee80211_if_ap *ap = &sdata->u.ap;
4250 beacon = rcu_dereference(ap->beacon);
4252 if (beacon->csa_counter_offsets[0]) {
4254 __ieee80211_csa_update_counter(beacon);
4256 ieee80211_set_csa(sdata, beacon);
4260 * headroom, head length,
4261 * tail length and maximum TIM length
4263 skb = dev_alloc_skb(local->tx_headroom +
4265 beacon->tail_len + 256 +
4266 local->hw.extra_beacon_tailroom);
4270 skb_reserve(skb, local->tx_headroom);
4271 skb_put_data(skb, beacon->head, beacon->head_len);
4273 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4277 offs->tim_offset = beacon->head_len;
4278 offs->tim_length = skb->len - beacon->head_len;
4280 /* for AP the csa offsets are from tail */
4281 csa_off_base = skb->len;
4285 skb_put_data(skb, beacon->tail,
4289 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4290 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4291 struct ieee80211_hdr *hdr;
4293 beacon = rcu_dereference(ifibss->presp);
4297 if (beacon->csa_counter_offsets[0]) {
4299 __ieee80211_csa_update_counter(beacon);
4301 ieee80211_set_csa(sdata, beacon);
4304 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4305 local->hw.extra_beacon_tailroom);
4308 skb_reserve(skb, local->tx_headroom);
4309 skb_put_data(skb, beacon->head, beacon->head_len);
4311 hdr = (struct ieee80211_hdr *) skb->data;
4312 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4313 IEEE80211_STYPE_BEACON);
4314 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4315 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4317 beacon = rcu_dereference(ifmsh->beacon);
4321 if (beacon->csa_counter_offsets[0]) {
4323 /* TODO: For mesh csa_counter is in TU, so
4324 * decrementing it by one isn't correct, but
4325 * for now we leave it consistent with overall
4326 * mac80211's behavior.
4328 __ieee80211_csa_update_counter(beacon);
4330 ieee80211_set_csa(sdata, beacon);
4333 if (ifmsh->sync_ops)
4334 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4336 skb = dev_alloc_skb(local->tx_headroom +
4340 local->hw.extra_beacon_tailroom);
4343 skb_reserve(skb, local->tx_headroom);
4344 skb_put_data(skb, beacon->head, beacon->head_len);
4345 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4348 offs->tim_offset = beacon->head_len;
4349 offs->tim_length = skb->len - beacon->head_len;
4352 skb_put_data(skb, beacon->tail, beacon->tail_len);
4359 if (offs && beacon) {
4362 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4363 u16 csa_off = beacon->csa_counter_offsets[i];
4368 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4372 band = chanctx_conf->def.chan->band;
4374 info = IEEE80211_SKB_CB(skb);
4376 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4377 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4380 memset(&txrc, 0, sizeof(txrc));
4382 txrc.sband = local->hw.wiphy->bands[band];
4383 txrc.bss_conf = &sdata->vif.bss_conf;
4385 txrc.reported_rate.idx = -1;
4386 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4388 rate_control_get_rate(sdata, NULL, &txrc);
4390 info->control.vif = vif;
4392 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4393 IEEE80211_TX_CTL_ASSIGN_SEQ |
4394 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4402 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4403 struct ieee80211_vif *vif,
4404 struct ieee80211_mutable_offsets *offs)
4406 return __ieee80211_beacon_get(hw, vif, offs, true);
4408 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4410 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4411 struct ieee80211_vif *vif,
4412 u16 *tim_offset, u16 *tim_length)
4414 struct ieee80211_mutable_offsets offs = {};
4415 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4416 struct sk_buff *copy;
4417 struct ieee80211_supported_band *sband;
4424 *tim_offset = offs.tim_offset;
4427 *tim_length = offs.tim_length;
4429 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4430 !hw_to_local(hw)->monitors)
4433 /* send a copy to monitor interfaces */
4434 copy = skb_copy(bcn, GFP_ATOMIC);
4438 shift = ieee80211_vif_get_shift(vif);
4439 sband = ieee80211_get_sband(vif_to_sdata(vif));
4443 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4447 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4449 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4450 struct ieee80211_vif *vif)
4452 struct ieee80211_if_ap *ap = NULL;
4453 struct sk_buff *skb = NULL;
4454 struct probe_resp *presp = NULL;
4455 struct ieee80211_hdr *hdr;
4456 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4458 if (sdata->vif.type != NL80211_IFTYPE_AP)
4464 presp = rcu_dereference(ap->probe_resp);
4468 skb = dev_alloc_skb(presp->len);
4472 skb_put_data(skb, presp->data, presp->len);
4474 hdr = (struct ieee80211_hdr *) skb->data;
4475 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4481 EXPORT_SYMBOL(ieee80211_proberesp_get);
4483 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4484 struct ieee80211_vif *vif)
4486 struct ieee80211_sub_if_data *sdata;
4487 struct ieee80211_if_managed *ifmgd;
4488 struct ieee80211_pspoll *pspoll;
4489 struct ieee80211_local *local;
4490 struct sk_buff *skb;
4492 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4495 sdata = vif_to_sdata(vif);
4496 ifmgd = &sdata->u.mgd;
4497 local = sdata->local;
4499 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4503 skb_reserve(skb, local->hw.extra_tx_headroom);
4505 pspoll = skb_put_zero(skb, sizeof(*pspoll));
4506 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4507 IEEE80211_STYPE_PSPOLL);
4508 pspoll->aid = cpu_to_le16(ifmgd->aid);
4510 /* aid in PS-Poll has its two MSBs each set to 1 */
4511 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4513 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4514 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4518 EXPORT_SYMBOL(ieee80211_pspoll_get);
4520 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4521 struct ieee80211_vif *vif,
4524 struct ieee80211_hdr_3addr *nullfunc;
4525 struct ieee80211_sub_if_data *sdata;
4526 struct ieee80211_if_managed *ifmgd;
4527 struct ieee80211_local *local;
4528 struct sk_buff *skb;
4531 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4534 sdata = vif_to_sdata(vif);
4535 ifmgd = &sdata->u.mgd;
4536 local = sdata->local;
4539 struct sta_info *sta;
4542 sta = sta_info_get(sdata, ifmgd->bssid);
4543 qos = sta && sta->sta.wme;
4547 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4548 sizeof(*nullfunc) + 2);
4552 skb_reserve(skb, local->hw.extra_tx_headroom);
4554 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4555 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4556 IEEE80211_STYPE_NULLFUNC |
4557 IEEE80211_FCTL_TODS);
4559 __le16 qos = cpu_to_le16(7);
4561 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
4562 IEEE80211_STYPE_NULLFUNC) !=
4563 IEEE80211_STYPE_QOS_NULLFUNC);
4564 nullfunc->frame_control |=
4565 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
4567 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
4568 skb_put_data(skb, &qos, sizeof(qos));
4571 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4572 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4573 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4577 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4579 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4581 const u8 *ssid, size_t ssid_len,
4584 struct ieee80211_local *local = hw_to_local(hw);
4585 struct ieee80211_hdr_3addr *hdr;
4586 struct sk_buff *skb;
4590 ie_ssid_len = 2 + ssid_len;
4592 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4593 ie_ssid_len + tailroom);
4597 skb_reserve(skb, local->hw.extra_tx_headroom);
4599 hdr = skb_put_zero(skb, sizeof(*hdr));
4600 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4601 IEEE80211_STYPE_PROBE_REQ);
4602 eth_broadcast_addr(hdr->addr1);
4603 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4604 eth_broadcast_addr(hdr->addr3);
4606 pos = skb_put(skb, ie_ssid_len);
4607 *pos++ = WLAN_EID_SSID;
4610 memcpy(pos, ssid, ssid_len);
4615 EXPORT_SYMBOL(ieee80211_probereq_get);
4617 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4618 const void *frame, size_t frame_len,
4619 const struct ieee80211_tx_info *frame_txctl,
4620 struct ieee80211_rts *rts)
4622 const struct ieee80211_hdr *hdr = frame;
4624 rts->frame_control =
4625 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4626 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4628 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4629 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4631 EXPORT_SYMBOL(ieee80211_rts_get);
4633 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4634 const void *frame, size_t frame_len,
4635 const struct ieee80211_tx_info *frame_txctl,
4636 struct ieee80211_cts *cts)
4638 const struct ieee80211_hdr *hdr = frame;
4640 cts->frame_control =
4641 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4642 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4643 frame_len, frame_txctl);
4644 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4646 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4649 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4650 struct ieee80211_vif *vif)
4652 struct ieee80211_local *local = hw_to_local(hw);
4653 struct sk_buff *skb = NULL;
4654 struct ieee80211_tx_data tx;
4655 struct ieee80211_sub_if_data *sdata;
4657 struct ieee80211_tx_info *info;
4658 struct ieee80211_chanctx_conf *chanctx_conf;
4660 sdata = vif_to_sdata(vif);
4663 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4668 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4669 struct beacon_data *beacon =
4670 rcu_dereference(sdata->u.ap.beacon);
4672 if (!beacon || !beacon->head)
4675 ps = &sdata->u.ap.ps;
4676 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4677 ps = &sdata->u.mesh.ps;
4682 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4683 goto out; /* send buffered bc/mc only after DTIM beacon */
4686 skb = skb_dequeue(&ps->bc_buf);
4689 local->total_ps_buffered--;
4691 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4692 struct ieee80211_hdr *hdr =
4693 (struct ieee80211_hdr *) skb->data;
4694 /* more buffered multicast/broadcast frames ==> set
4695 * MoreData flag in IEEE 802.11 header to inform PS
4697 hdr->frame_control |=
4698 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4701 if (sdata->vif.type == NL80211_IFTYPE_AP)
4702 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4703 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4705 ieee80211_free_txskb(hw, skb);
4708 info = IEEE80211_SKB_CB(skb);
4710 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4711 info->band = chanctx_conf->def.chan->band;
4713 if (invoke_tx_handlers(&tx))
4720 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4722 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4724 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4725 struct ieee80211_sub_if_data *sdata = sta->sdata;
4726 struct ieee80211_local *local = sdata->local;
4730 lockdep_assert_held(&local->sta_mtx);
4732 /* only some cases are supported right now */
4733 switch (sdata->vif.type) {
4734 case NL80211_IFTYPE_STATION:
4735 case NL80211_IFTYPE_AP:
4736 case NL80211_IFTYPE_AP_VLAN:
4743 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4746 if (sta->reserved_tid == tid) {
4751 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4752 sdata_err(sdata, "TID reservation already active\n");
4757 ieee80211_stop_vif_queues(sdata->local, sdata,
4758 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4762 /* Tear down BA sessions so we stop aggregating on this TID */
4763 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4764 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4765 __ieee80211_stop_tx_ba_session(sta, tid,
4766 AGG_STOP_LOCAL_REQUEST);
4769 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4770 __ieee80211_flush_queues(local, sdata, queues, false);
4772 sta->reserved_tid = tid;
4774 ieee80211_wake_vif_queues(local, sdata,
4775 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4777 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4778 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4784 EXPORT_SYMBOL(ieee80211_reserve_tid);
4786 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4788 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4789 struct ieee80211_sub_if_data *sdata = sta->sdata;
4791 lockdep_assert_held(&sdata->local->sta_mtx);
4793 /* only some cases are supported right now */
4794 switch (sdata->vif.type) {
4795 case NL80211_IFTYPE_STATION:
4796 case NL80211_IFTYPE_AP:
4797 case NL80211_IFTYPE_AP_VLAN:
4804 if (tid != sta->reserved_tid) {
4805 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4809 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4811 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4813 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4814 struct sk_buff *skb, int tid,
4815 enum nl80211_band band, u32 txdata_flags)
4817 int ac = ieee80211_ac_from_tid(tid);
4819 skb_reset_mac_header(skb);
4820 skb_set_queue_mapping(skb, ac);
4821 skb->priority = tid;
4823 skb->dev = sdata->dev;
4826 * The other path calling ieee80211_xmit is from the tasklet,
4827 * and while we can handle concurrent transmissions locking
4828 * requirements are that we do not come into tx with bhs on.
4831 IEEE80211_SKB_CB(skb)->band = band;
4832 ieee80211_xmit(sdata, NULL, skb, txdata_flags);
4836 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
4837 const u8 *buf, size_t len,
4838 const u8 *dest, __be16 proto, bool unencrypted)
4840 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4841 struct ieee80211_local *local = sdata->local;
4842 struct sk_buff *skb;
4843 struct ethhdr *ehdr;
4846 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
4847 * or Pre-Authentication
4849 if (proto != sdata->control_port_protocol &&
4850 proto != cpu_to_be16(ETH_P_PREAUTH))
4854 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT;
4858 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4859 sizeof(struct ethhdr) + len);
4863 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
4865 skb_put_data(skb, buf, len);
4867 ehdr = skb_push(skb, sizeof(struct ethhdr));
4868 memcpy(ehdr->h_dest, dest, ETH_ALEN);
4869 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
4870 ehdr->h_proto = proto;
4873 skb->protocol = htons(ETH_P_802_3);
4874 skb_reset_network_header(skb);
4875 skb_reset_mac_header(skb);
4878 __ieee80211_subif_start_xmit(skb, skb->dev, flags);