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;
217 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
219 /* driver doesn't support power save */
220 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
223 /* hardware does dynamic power save */
224 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
227 /* dynamic power save disabled */
228 if (local->hw.conf.dynamic_ps_timeout <= 0)
231 /* we are scanning, don't enable power save */
235 if (!local->ps_sdata)
238 /* No point if we're going to suspend */
239 if (local->quiescing)
242 /* dynamic ps is supported only in managed mode */
243 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
246 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK))
249 ifmgd = &tx->sdata->u.mgd;
252 * Don't wakeup from power save if u-apsd is enabled, voip ac has
253 * u-apsd enabled and the frame is in voip class. This effectively
254 * means that even if all access categories have u-apsd enabled, in
255 * practise u-apsd is only used with the voip ac. This is a
256 * workaround for the case when received voip class packets do not
257 * have correct qos tag for some reason, due the network or the
260 * Note: ifmgd->uapsd_queues access is racy here. If the value is
261 * changed via debugfs, user needs to reassociate manually to have
262 * everything in sync.
264 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
265 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
266 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
269 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
270 ieee80211_stop_queues_by_reason(&local->hw,
271 IEEE80211_MAX_QUEUE_MAP,
272 IEEE80211_QUEUE_STOP_REASON_PS,
274 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
275 ieee80211_queue_work(&local->hw,
276 &local->dynamic_ps_disable_work);
279 /* Don't restart the timer if we're not disassociated */
280 if (!ifmgd->associated)
283 mod_timer(&local->dynamic_ps_timer, jiffies +
284 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
289 static ieee80211_tx_result debug_noinline
290 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
293 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
294 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
297 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
300 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
301 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
302 !ieee80211_is_probe_req(hdr->frame_control) &&
303 !ieee80211_is_nullfunc(hdr->frame_control))
305 * When software scanning only nullfunc frames (to notify
306 * the sleep state to the AP) and probe requests (for the
307 * active scan) are allowed, all other frames should not be
308 * sent and we should not get here, but if we do
309 * nonetheless, drop them to avoid sending them
310 * off-channel. See the link below and
311 * ieee80211_start_scan() for more.
313 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
317 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
320 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
323 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
327 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
329 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
330 if (unlikely(!assoc &&
331 ieee80211_is_data(hdr->frame_control))) {
332 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
333 sdata_info(tx->sdata,
334 "dropped data frame to not associated station %pM\n",
337 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
340 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
341 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
343 * No associated STAs - no need to send multicast
352 /* This function is called whenever the AP is about to exceed the maximum limit
353 * of buffered frames for power saving STAs. This situation should not really
354 * happen often during normal operation, so dropping the oldest buffered packet
355 * from each queue should be OK to make some room for new frames. */
356 static void purge_old_ps_buffers(struct ieee80211_local *local)
358 int total = 0, purged = 0;
360 struct ieee80211_sub_if_data *sdata;
361 struct sta_info *sta;
363 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
366 if (sdata->vif.type == NL80211_IFTYPE_AP)
367 ps = &sdata->u.ap.ps;
368 else if (ieee80211_vif_is_mesh(&sdata->vif))
369 ps = &sdata->u.mesh.ps;
373 skb = skb_dequeue(&ps->bc_buf);
376 ieee80211_free_txskb(&local->hw, skb);
378 total += skb_queue_len(&ps->bc_buf);
382 * Drop one frame from each station from the lowest-priority
383 * AC that has frames at all.
385 list_for_each_entry_rcu(sta, &local->sta_list, list) {
388 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
389 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
390 total += skb_queue_len(&sta->ps_tx_buf[ac]);
393 ieee80211_free_txskb(&local->hw, skb);
399 local->total_ps_buffered = total;
400 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
403 static ieee80211_tx_result
404 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
406 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
407 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
411 * broadcast/multicast frame
413 * If any of the associated/peer stations is in power save mode,
414 * the frame is buffered to be sent after DTIM beacon frame.
415 * This is done either by the hardware or us.
418 /* powersaving STAs currently only in AP/VLAN/mesh mode */
419 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
420 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
424 ps = &tx->sdata->bss->ps;
425 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
426 ps = &tx->sdata->u.mesh.ps;
432 /* no buffering for ordered frames */
433 if (ieee80211_has_order(hdr->frame_control))
436 if (ieee80211_is_probe_req(hdr->frame_control))
439 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
440 info->hw_queue = tx->sdata->vif.cab_queue;
442 /* no stations in PS mode and no buffered packets */
443 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
446 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
448 /* device releases frame after DTIM beacon */
449 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
452 /* buffered in mac80211 */
453 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
454 purge_old_ps_buffers(tx->local);
456 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
458 "BC TX buffer full - dropping the oldest frame\n");
459 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
461 tx->local->total_ps_buffered++;
463 skb_queue_tail(&ps->bc_buf, tx->skb);
468 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
471 if (!ieee80211_is_mgmt(fc))
474 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
477 if (!ieee80211_is_robust_mgmt_frame(skb))
483 static ieee80211_tx_result
484 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
486 struct sta_info *sta = tx->sta;
487 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
488 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
489 struct ieee80211_local *local = tx->local;
494 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
495 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
496 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
497 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
498 int ac = skb_get_queue_mapping(tx->skb);
500 if (ieee80211_is_mgmt(hdr->frame_control) &&
501 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
502 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
506 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
507 sta->sta.addr, sta->sta.aid, ac);
508 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
509 purge_old_ps_buffers(tx->local);
511 /* sync with ieee80211_sta_ps_deliver_wakeup */
512 spin_lock(&sta->ps_lock);
514 * STA woke up the meantime and all the frames on ps_tx_buf have
515 * been queued to pending queue. No reordering can happen, go
516 * ahead and Tx the packet.
518 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
519 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
520 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
521 spin_unlock(&sta->ps_lock);
525 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
526 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
528 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
530 ieee80211_free_txskb(&local->hw, old);
532 tx->local->total_ps_buffered++;
534 info->control.jiffies = jiffies;
535 info->control.vif = &tx->sdata->vif;
536 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
537 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
538 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
539 spin_unlock(&sta->ps_lock);
541 if (!timer_pending(&local->sta_cleanup))
542 mod_timer(&local->sta_cleanup,
543 round_jiffies(jiffies +
544 STA_INFO_CLEANUP_INTERVAL));
547 * We queued up some frames, so the TIM bit might
548 * need to be set, recalculate it.
550 sta_info_recalc_tim(sta);
553 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
555 "STA %pM in PS mode, but polling/in SP -> send frame\n",
562 static ieee80211_tx_result debug_noinline
563 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
565 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
568 if (tx->flags & IEEE80211_TX_UNICAST)
569 return ieee80211_tx_h_unicast_ps_buf(tx);
571 return ieee80211_tx_h_multicast_ps_buf(tx);
574 static ieee80211_tx_result debug_noinline
575 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
577 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
579 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
580 if (tx->sdata->control_port_no_encrypt)
581 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
582 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
583 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
589 static ieee80211_tx_result debug_noinline
590 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
592 struct ieee80211_key *key;
593 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
594 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
596 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
599 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
601 else if (ieee80211_is_group_privacy_action(tx->skb) &&
602 (key = rcu_dereference(tx->sdata->default_multicast_key)))
604 else if (ieee80211_is_mgmt(hdr->frame_control) &&
605 is_multicast_ether_addr(hdr->addr1) &&
606 ieee80211_is_robust_mgmt_frame(tx->skb) &&
607 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
609 else if (is_multicast_ether_addr(hdr->addr1) &&
610 (key = rcu_dereference(tx->sdata->default_multicast_key)))
612 else if (!is_multicast_ether_addr(hdr->addr1) &&
613 (key = rcu_dereference(tx->sdata->default_unicast_key)))
619 bool skip_hw = false;
621 /* TODO: add threshold stuff again */
623 switch (tx->key->conf.cipher) {
624 case WLAN_CIPHER_SUITE_WEP40:
625 case WLAN_CIPHER_SUITE_WEP104:
626 case WLAN_CIPHER_SUITE_TKIP:
627 if (!ieee80211_is_data_present(hdr->frame_control))
630 case WLAN_CIPHER_SUITE_CCMP:
631 case WLAN_CIPHER_SUITE_CCMP_256:
632 case WLAN_CIPHER_SUITE_GCMP:
633 case WLAN_CIPHER_SUITE_GCMP_256:
634 if (!ieee80211_is_data_present(hdr->frame_control) &&
635 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
637 !ieee80211_is_group_privacy_action(tx->skb))
640 skip_hw = (tx->key->conf.flags &
641 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
642 ieee80211_is_mgmt(hdr->frame_control);
644 case WLAN_CIPHER_SUITE_AES_CMAC:
645 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
646 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
647 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
648 if (!ieee80211_is_mgmt(hdr->frame_control))
653 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
654 !ieee80211_is_deauth(hdr->frame_control)))
657 if (!skip_hw && tx->key &&
658 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
659 info->control.hw_key = &tx->key->conf;
665 static ieee80211_tx_result debug_noinline
666 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
668 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
669 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
670 struct ieee80211_supported_band *sband;
672 struct ieee80211_tx_rate_control txrc;
673 struct ieee80211_sta_rates *ratetbl = NULL;
676 memset(&txrc, 0, sizeof(txrc));
678 sband = tx->local->hw.wiphy->bands[info->band];
680 len = min_t(u32, tx->skb->len + FCS_LEN,
681 tx->local->hw.wiphy->frag_threshold);
683 /* set up the tx rate control struct we give the RC algo */
684 txrc.hw = &tx->local->hw;
686 txrc.bss_conf = &tx->sdata->vif.bss_conf;
688 txrc.reported_rate.idx = -1;
689 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
691 if (tx->sdata->rc_has_mcs_mask[info->band])
692 txrc.rate_idx_mcs_mask =
693 tx->sdata->rc_rateidx_mcs_mask[info->band];
695 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
696 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
697 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
698 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
700 /* set up RTS protection if desired */
701 if (len > tx->local->hw.wiphy->rts_threshold) {
705 info->control.use_rts = txrc.rts;
706 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
709 * Use short preamble if the BSS can handle it, but not for
710 * management frames unless we know the receiver can handle
711 * that -- the management frame might be to a station that
712 * just wants a probe response.
714 if (tx->sdata->vif.bss_conf.use_short_preamble &&
715 (ieee80211_is_data(hdr->frame_control) ||
716 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
717 txrc.short_preamble = true;
719 info->control.short_preamble = txrc.short_preamble;
721 /* don't ask rate control when rate already injected via radiotap */
722 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
726 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
729 * Lets not bother rate control if we're associated and cannot
730 * talk to the sta. This should not happen.
732 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
733 !rate_usable_index_exists(sband, &tx->sta->sta),
734 "%s: Dropped data frame as no usable bitrate found while "
735 "scanning and associated. Target station: "
736 "%pM on %d GHz band\n",
737 tx->sdata->name, hdr->addr1,
742 * If we're associated with the sta at this point we know we can at
743 * least send the frame at the lowest bit rate.
745 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
747 if (tx->sta && !info->control.skip_table)
748 ratetbl = rcu_dereference(tx->sta->sta.rates);
750 if (unlikely(info->control.rates[0].idx < 0)) {
752 struct ieee80211_tx_rate rate = {
753 .idx = ratetbl->rate[0].idx,
754 .flags = ratetbl->rate[0].flags,
755 .count = ratetbl->rate[0].count
758 if (ratetbl->rate[0].idx < 0)
766 tx->rate = info->control.rates[0];
769 if (txrc.reported_rate.idx < 0) {
770 txrc.reported_rate = tx->rate;
771 if (tx->sta && ieee80211_is_data(hdr->frame_control))
772 tx->sta->tx_stats.last_rate = txrc.reported_rate;
774 tx->sta->tx_stats.last_rate = txrc.reported_rate;
779 if (unlikely(!info->control.rates[0].count))
780 info->control.rates[0].count = 1;
782 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
783 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
784 info->control.rates[0].count = 1;
789 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
791 u16 *seq = &sta->tid_seq[tid];
792 __le16 ret = cpu_to_le16(*seq);
794 /* Increase the sequence number. */
795 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
800 static ieee80211_tx_result debug_noinline
801 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
803 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
804 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
808 * Packet injection may want to control the sequence
809 * number, if we have no matching interface then we
810 * neither assign one ourselves nor ask the driver to.
812 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
815 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
818 if (ieee80211_hdrlen(hdr->frame_control) < 24)
821 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
825 * Anything but QoS data that has a sequence number field
826 * (is long enough) gets a sequence number from the global
827 * counter. QoS data frames with a multicast destination
828 * also use the global counter (802.11-2012 9.3.2.10).
830 if (!ieee80211_is_data_qos(hdr->frame_control) ||
831 is_multicast_ether_addr(hdr->addr1)) {
832 if (tx->flags & IEEE80211_TX_NO_SEQNO)
834 /* driver should assign sequence number */
835 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
836 /* for pure STA mode without beacons, we can do it */
837 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
838 tx->sdata->sequence_number += 0x10;
840 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
845 * This should be true for injected/management frames only, for
846 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
847 * above since they are not QoS-data frames.
852 /* include per-STA, per-TID sequence counter */
853 tid = ieee80211_get_tid(hdr);
854 tx->sta->tx_stats.msdu[tid]++;
856 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
861 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
862 struct sk_buff *skb, int hdrlen,
865 struct ieee80211_local *local = tx->local;
866 struct ieee80211_tx_info *info;
868 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
869 int pos = hdrlen + per_fragm;
870 int rem = skb->len - hdrlen - per_fragm;
872 if (WARN_ON(rem < 0))
875 /* first fragment was already added to queue by caller */
878 int fraglen = per_fragm;
883 tmp = dev_alloc_skb(local->tx_headroom +
885 tx->sdata->encrypt_headroom +
886 IEEE80211_ENCRYPT_TAILROOM);
890 __skb_queue_tail(&tx->skbs, tmp);
893 local->tx_headroom + tx->sdata->encrypt_headroom);
895 /* copy control information */
896 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
898 info = IEEE80211_SKB_CB(tmp);
899 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
900 IEEE80211_TX_CTL_FIRST_FRAGMENT);
903 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
905 skb_copy_queue_mapping(tmp, skb);
906 tmp->priority = skb->priority;
909 /* copy header and data */
910 skb_put_data(tmp, skb->data, hdrlen);
911 skb_put_data(tmp, skb->data + pos, fraglen);
916 /* adjust first fragment's length */
917 skb_trim(skb, hdrlen + per_fragm);
921 static ieee80211_tx_result debug_noinline
922 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
924 struct sk_buff *skb = tx->skb;
925 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
926 struct ieee80211_hdr *hdr = (void *)skb->data;
927 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
931 /* no matter what happens, tx->skb moves to tx->skbs */
932 __skb_queue_tail(&tx->skbs, skb);
935 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
938 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
942 * Warn when submitting a fragmented A-MPDU frame and drop it.
943 * This scenario is handled in ieee80211_tx_prepare but extra
944 * caution taken here as fragmented ampdu may cause Tx stop.
946 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
949 hdrlen = ieee80211_hdrlen(hdr->frame_control);
951 /* internal error, why isn't DONTFRAG set? */
952 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
956 * Now fragment the frame. This will allocate all the fragments and
957 * chain them (using skb as the first fragment) to skb->next.
958 * During transmission, we will remove the successfully transmitted
959 * fragments from this list. When the low-level driver rejects one
960 * of the fragments then we will simply pretend to accept the skb
961 * but store it away as pending.
963 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
966 /* update duration/seq/flags of fragments */
969 skb_queue_walk(&tx->skbs, skb) {
970 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
972 hdr = (void *)skb->data;
973 info = IEEE80211_SKB_CB(skb);
975 if (!skb_queue_is_last(&tx->skbs, skb)) {
976 hdr->frame_control |= morefrags;
978 * No multi-rate retries for fragmented frames, that
979 * would completely throw off the NAV at other STAs.
981 info->control.rates[1].idx = -1;
982 info->control.rates[2].idx = -1;
983 info->control.rates[3].idx = -1;
984 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
985 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
987 hdr->frame_control &= ~morefrags;
989 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
996 static ieee80211_tx_result debug_noinline
997 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1005 skb_queue_walk(&tx->skbs, skb) {
1006 ac = skb_get_queue_mapping(skb);
1007 tx->sta->tx_stats.bytes[ac] += skb->len;
1010 tx->sta->tx_stats.packets[ac]++;
1015 static ieee80211_tx_result debug_noinline
1016 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1021 switch (tx->key->conf.cipher) {
1022 case WLAN_CIPHER_SUITE_WEP40:
1023 case WLAN_CIPHER_SUITE_WEP104:
1024 return ieee80211_crypto_wep_encrypt(tx);
1025 case WLAN_CIPHER_SUITE_TKIP:
1026 return ieee80211_crypto_tkip_encrypt(tx);
1027 case WLAN_CIPHER_SUITE_CCMP:
1028 return ieee80211_crypto_ccmp_encrypt(
1029 tx, IEEE80211_CCMP_MIC_LEN);
1030 case WLAN_CIPHER_SUITE_CCMP_256:
1031 return ieee80211_crypto_ccmp_encrypt(
1032 tx, IEEE80211_CCMP_256_MIC_LEN);
1033 case WLAN_CIPHER_SUITE_AES_CMAC:
1034 return ieee80211_crypto_aes_cmac_encrypt(tx);
1035 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1036 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1037 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1038 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1039 return ieee80211_crypto_aes_gmac_encrypt(tx);
1040 case WLAN_CIPHER_SUITE_GCMP:
1041 case WLAN_CIPHER_SUITE_GCMP_256:
1042 return ieee80211_crypto_gcmp_encrypt(tx);
1044 return ieee80211_crypto_hw_encrypt(tx);
1050 static ieee80211_tx_result debug_noinline
1051 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1053 struct sk_buff *skb;
1054 struct ieee80211_hdr *hdr;
1058 skb_queue_walk(&tx->skbs, skb) {
1059 hdr = (void *) skb->data;
1060 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1061 break; /* must not overwrite AID */
1062 if (!skb_queue_is_last(&tx->skbs, skb)) {
1063 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1064 next_len = next->len;
1067 group_addr = is_multicast_ether_addr(hdr->addr1);
1070 ieee80211_duration(tx, skb, group_addr, next_len);
1076 /* actual transmit path */
1078 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1079 struct sk_buff *skb,
1080 struct ieee80211_tx_info *info,
1081 struct tid_ampdu_tx *tid_tx,
1084 bool queued = false;
1085 bool reset_agg_timer = false;
1086 struct sk_buff *purge_skb = NULL;
1088 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1089 info->flags |= IEEE80211_TX_CTL_AMPDU;
1090 reset_agg_timer = true;
1091 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1093 * nothing -- this aggregation session is being started
1094 * but that might still fail with the driver
1096 } else if (!tx->sta->sta.txq[tid]) {
1097 spin_lock(&tx->sta->lock);
1099 * Need to re-check now, because we may get here
1101 * 1) in the window during which the setup is actually
1102 * already done, but not marked yet because not all
1103 * packets are spliced over to the driver pending
1104 * queue yet -- if this happened we acquire the lock
1105 * either before or after the splice happens, but
1106 * need to recheck which of these cases happened.
1108 * 2) during session teardown, if the OPERATIONAL bit
1109 * was cleared due to the teardown but the pointer
1110 * hasn't been assigned NULL yet (or we loaded it
1111 * before it was assigned) -- in this case it may
1112 * now be NULL which means we should just let the
1113 * packet pass through because splicing the frames
1114 * back is already done.
1116 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1119 /* do nothing, let packet pass through */
1120 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1121 info->flags |= IEEE80211_TX_CTL_AMPDU;
1122 reset_agg_timer = true;
1125 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1126 clear_sta_flag(tx->sta, WLAN_STA_SP);
1127 ps_dbg(tx->sta->sdata,
1128 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1129 tx->sta->sta.addr, tx->sta->sta.aid);
1131 info->control.vif = &tx->sdata->vif;
1132 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1133 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1134 __skb_queue_tail(&tid_tx->pending, skb);
1135 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1136 purge_skb = __skb_dequeue(&tid_tx->pending);
1138 spin_unlock(&tx->sta->lock);
1141 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1144 /* reset session timer */
1145 if (reset_agg_timer)
1146 tid_tx->last_tx = jiffies;
1153 * pass %NULL for the station if unknown, a valid pointer if known
1154 * or an ERR_PTR() if the station is known not to exist
1156 static ieee80211_tx_result
1157 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1158 struct ieee80211_tx_data *tx,
1159 struct sta_info *sta, struct sk_buff *skb)
1161 struct ieee80211_local *local = sdata->local;
1162 struct ieee80211_hdr *hdr;
1163 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1166 memset(tx, 0, sizeof(*tx));
1170 __skb_queue_head_init(&tx->skbs);
1173 * If this flag is set to true anywhere, and we get here,
1174 * we are doing the needed processing, so remove the flag
1177 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1179 hdr = (struct ieee80211_hdr *) skb->data;
1185 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1186 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1187 if (!tx->sta && sdata->wdev.use_4addr)
1189 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1190 IEEE80211_TX_CTL_INJECTED) ||
1191 tx->sdata->control_port_protocol == tx->skb->protocol) {
1192 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1194 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1195 tx->sta = sta_info_get(sdata, hdr->addr1);
1198 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1199 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1200 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1201 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1202 struct tid_ampdu_tx *tid_tx;
1204 tid = ieee80211_get_tid(hdr);
1206 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1210 queued = ieee80211_tx_prep_agg(tx, skb, info,
1213 if (unlikely(queued))
1218 if (is_multicast_ether_addr(hdr->addr1)) {
1219 tx->flags &= ~IEEE80211_TX_UNICAST;
1220 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1222 tx->flags |= IEEE80211_TX_UNICAST;
1224 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1225 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1226 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1227 info->flags & IEEE80211_TX_CTL_AMPDU)
1228 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1232 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1233 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1234 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1235 ieee80211_check_fast_xmit(tx->sta);
1238 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1243 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1244 struct ieee80211_vif *vif,
1245 struct sta_info *sta,
1246 struct sk_buff *skb)
1248 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1249 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1250 struct ieee80211_txq *txq = NULL;
1252 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1253 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1256 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
1257 if ((!ieee80211_is_mgmt(hdr->frame_control) ||
1258 ieee80211_is_bufferable_mmpdu(hdr->frame_control) ||
1259 vif->type == NL80211_IFTYPE_STATION) &&
1260 sta && sta->uploaded) {
1262 * This will be NULL if the driver didn't set the
1263 * opt-in hardware flag.
1265 txq = sta->sta.txq[IEEE80211_NUM_TIDS];
1268 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1273 txq = sta->sta.txq[tid];
1281 return to_txq_info(txq);
1284 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1286 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1289 static u32 codel_skb_len_func(const struct sk_buff *skb)
1294 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1296 const struct ieee80211_tx_info *info;
1298 info = (const struct ieee80211_tx_info *)skb->cb;
1299 return info->control.enqueue_time;
1302 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1305 struct ieee80211_local *local;
1306 struct txq_info *txqi;
1308 struct fq_flow *flow;
1311 local = vif_to_sdata(txqi->txq.vif)->local;
1314 if (cvars == &txqi->def_cvars)
1315 flow = &txqi->def_flow;
1317 flow = &fq->flows[cvars - local->cvars];
1319 return fq_flow_dequeue(fq, flow);
1322 static void codel_drop_func(struct sk_buff *skb,
1325 struct ieee80211_local *local;
1326 struct ieee80211_hw *hw;
1327 struct txq_info *txqi;
1330 local = vif_to_sdata(txqi->txq.vif)->local;
1333 ieee80211_free_txskb(hw, skb);
1336 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1338 struct fq_flow *flow)
1340 struct ieee80211_local *local;
1341 struct txq_info *txqi;
1342 struct codel_vars *cvars;
1343 struct codel_params *cparams;
1344 struct codel_stats *cstats;
1346 local = container_of(fq, struct ieee80211_local, fq);
1347 txqi = container_of(tin, struct txq_info, tin);
1348 cstats = &txqi->cstats;
1350 if (txqi->txq.sta) {
1351 struct sta_info *sta = container_of(txqi->txq.sta,
1352 struct sta_info, sta);
1353 cparams = &sta->cparams;
1355 cparams = &local->cparams;
1358 if (flow == &txqi->def_flow)
1359 cvars = &txqi->def_cvars;
1361 cvars = &local->cvars[flow - fq->flows];
1363 return codel_dequeue(txqi,
1369 codel_skb_time_func,
1371 codel_dequeue_func);
1374 static void fq_skb_free_func(struct fq *fq,
1376 struct fq_flow *flow,
1377 struct sk_buff *skb)
1379 struct ieee80211_local *local;
1381 local = container_of(fq, struct ieee80211_local, fq);
1382 ieee80211_free_txskb(&local->hw, skb);
1385 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1388 struct sk_buff *skb)
1390 struct txq_info *txqi;
1392 txqi = container_of(tin, struct txq_info, tin);
1393 return &txqi->def_flow;
1396 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1397 struct txq_info *txqi,
1398 struct sk_buff *skb)
1400 struct fq *fq = &local->fq;
1401 struct fq_tin *tin = &txqi->tin;
1403 ieee80211_set_skb_enqueue_time(skb);
1404 fq_tin_enqueue(fq, tin, skb,
1406 fq_flow_get_default_func);
1409 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1410 struct fq_flow *flow, struct sk_buff *skb,
1413 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1415 return info->control.vif == data;
1418 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1419 struct ieee80211_sub_if_data *sdata)
1421 struct fq *fq = &local->fq;
1422 struct txq_info *txqi;
1424 struct ieee80211_sub_if_data *ap;
1426 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1429 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1434 txqi = to_txq_info(ap->vif.txq);
1437 spin_lock_bh(&fq->lock);
1438 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1440 spin_unlock_bh(&fq->lock);
1443 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1444 struct sta_info *sta,
1445 struct txq_info *txqi, int tid)
1447 fq_tin_init(&txqi->tin);
1448 fq_flow_init(&txqi->def_flow);
1449 codel_vars_init(&txqi->def_cvars);
1450 codel_stats_init(&txqi->cstats);
1451 __skb_queue_head_init(&txqi->frags);
1453 txqi->txq.vif = &sdata->vif;
1456 sdata->vif.txq = &txqi->txq;
1458 txqi->txq.ac = IEEE80211_AC_BE;
1463 if (tid == IEEE80211_NUM_TIDS) {
1464 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1465 /* Drivers need to opt in to the management MPDU TXQ */
1466 if (!ieee80211_hw_check(&sdata->local->hw,
1469 } else if (!ieee80211_hw_check(&sdata->local->hw,
1471 /* Drivers need to opt in to the bufferable MMPDU TXQ */
1474 txqi->txq.ac = IEEE80211_AC_VO;
1476 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1479 txqi->txq.sta = &sta->sta;
1480 txqi->txq.tid = tid;
1481 sta->sta.txq[tid] = &txqi->txq;
1484 void ieee80211_txq_purge(struct ieee80211_local *local,
1485 struct txq_info *txqi)
1487 struct fq *fq = &local->fq;
1488 struct fq_tin *tin = &txqi->tin;
1490 fq_tin_reset(fq, tin, fq_skb_free_func);
1491 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1494 void ieee80211_txq_set_params(struct ieee80211_local *local)
1496 if (local->hw.wiphy->txq_limit)
1497 local->fq.limit = local->hw.wiphy->txq_limit;
1499 local->hw.wiphy->txq_limit = local->fq.limit;
1501 if (local->hw.wiphy->txq_memory_limit)
1502 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1504 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1506 if (local->hw.wiphy->txq_quantum)
1507 local->fq.quantum = local->hw.wiphy->txq_quantum;
1509 local->hw.wiphy->txq_quantum = local->fq.quantum;
1512 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1514 struct fq *fq = &local->fq;
1517 bool supp_vht = false;
1518 enum nl80211_band band;
1520 if (!local->ops->wake_tx_queue)
1523 ret = fq_init(fq, 4096);
1528 * If the hardware doesn't support VHT, it is safe to limit the maximum
1529 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1531 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1532 struct ieee80211_supported_band *sband;
1534 sband = local->hw.wiphy->bands[band];
1538 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1542 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1544 codel_params_init(&local->cparams);
1545 local->cparams.interval = MS2TIME(100);
1546 local->cparams.target = MS2TIME(20);
1547 local->cparams.ecn = true;
1549 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1551 if (!local->cvars) {
1552 spin_lock_bh(&fq->lock);
1553 fq_reset(fq, fq_skb_free_func);
1554 spin_unlock_bh(&fq->lock);
1558 for (i = 0; i < fq->flows_cnt; i++)
1559 codel_vars_init(&local->cvars[i]);
1561 ieee80211_txq_set_params(local);
1566 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1568 struct fq *fq = &local->fq;
1570 if (!local->ops->wake_tx_queue)
1573 kfree(local->cvars);
1574 local->cvars = NULL;
1576 spin_lock_bh(&fq->lock);
1577 fq_reset(fq, fq_skb_free_func);
1578 spin_unlock_bh(&fq->lock);
1581 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1582 struct ieee80211_sub_if_data *sdata,
1583 struct sta_info *sta,
1584 struct sk_buff *skb)
1586 struct fq *fq = &local->fq;
1587 struct ieee80211_vif *vif;
1588 struct txq_info *txqi;
1590 if (!local->ops->wake_tx_queue ||
1591 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1594 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1595 sdata = container_of(sdata->bss,
1596 struct ieee80211_sub_if_data, u.ap);
1599 txqi = ieee80211_get_txq(local, vif, sta, skb);
1604 spin_lock_bh(&fq->lock);
1605 ieee80211_txq_enqueue(local, txqi, skb);
1606 spin_unlock_bh(&fq->lock);
1608 drv_wake_tx_queue(local, txqi);
1613 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1614 struct ieee80211_vif *vif,
1615 struct ieee80211_sta *sta,
1616 struct sk_buff_head *skbs,
1619 struct ieee80211_tx_control control = {};
1620 struct sk_buff *skb, *tmp;
1621 unsigned long flags;
1623 skb_queue_walk_safe(skbs, skb, tmp) {
1624 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1625 int q = info->hw_queue;
1627 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1628 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1629 __skb_unlink(skb, skbs);
1630 ieee80211_free_txskb(&local->hw, skb);
1635 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1636 if (local->queue_stop_reasons[q] ||
1637 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1638 if (unlikely(info->flags &
1639 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1640 if (local->queue_stop_reasons[q] &
1641 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1643 * Drop off-channel frames if queues
1644 * are stopped for any reason other
1645 * than off-channel operation. Never
1648 spin_unlock_irqrestore(
1649 &local->queue_stop_reason_lock,
1651 ieee80211_purge_tx_queue(&local->hw,
1658 * Since queue is stopped, queue up frames for
1659 * later transmission from the tx-pending
1660 * tasklet when the queue is woken again.
1663 skb_queue_splice_init(skbs,
1664 &local->pending[q]);
1666 skb_queue_splice_tail_init(skbs,
1667 &local->pending[q]);
1669 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1674 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1676 info->control.vif = vif;
1679 __skb_unlink(skb, skbs);
1680 drv_tx(local, &control, skb);
1687 * Returns false if the frame couldn't be transmitted but was queued instead.
1689 static bool __ieee80211_tx(struct ieee80211_local *local,
1690 struct sk_buff_head *skbs, int led_len,
1691 struct sta_info *sta, bool txpending)
1693 struct ieee80211_tx_info *info;
1694 struct ieee80211_sub_if_data *sdata;
1695 struct ieee80211_vif *vif;
1696 struct ieee80211_sta *pubsta;
1697 struct sk_buff *skb;
1701 if (WARN_ON(skb_queue_empty(skbs)))
1704 skb = skb_peek(skbs);
1705 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1706 info = IEEE80211_SKB_CB(skb);
1707 sdata = vif_to_sdata(info->control.vif);
1708 if (sta && !sta->uploaded)
1716 switch (sdata->vif.type) {
1717 case NL80211_IFTYPE_MONITOR:
1718 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1722 sdata = rcu_dereference(local->monitor_sdata);
1726 vif->hw_queue[skb_get_queue_mapping(skb)];
1727 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1728 ieee80211_purge_tx_queue(&local->hw, skbs);
1733 case NL80211_IFTYPE_AP_VLAN:
1734 sdata = container_of(sdata->bss,
1735 struct ieee80211_sub_if_data, u.ap);
1742 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1745 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1747 WARN_ON_ONCE(!skb_queue_empty(skbs));
1753 * Invoke TX handlers, return 0 on success and non-zero if the
1754 * frame was dropped or queued.
1756 * The handlers are split into an early and late part. The latter is everything
1757 * that can be sensitive to reordering, and will be deferred to after packets
1758 * are dequeued from the intermediate queues (when they are enabled).
1760 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1762 ieee80211_tx_result res = TX_DROP;
1764 #define CALL_TXH(txh) \
1767 if (res != TX_CONTINUE) \
1771 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1772 CALL_TXH(ieee80211_tx_h_check_assoc);
1773 CALL_TXH(ieee80211_tx_h_ps_buf);
1774 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1775 CALL_TXH(ieee80211_tx_h_select_key);
1776 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1777 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1780 if (unlikely(res == TX_DROP)) {
1781 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1783 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1785 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1787 } else if (unlikely(res == TX_QUEUED)) {
1788 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1796 * Late handlers can be called while the sta lock is held. Handlers that can
1797 * cause packets to be generated will cause deadlock!
1799 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1801 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1802 ieee80211_tx_result res = TX_CONTINUE;
1804 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1805 __skb_queue_tail(&tx->skbs, tx->skb);
1810 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1811 CALL_TXH(ieee80211_tx_h_sequence);
1812 CALL_TXH(ieee80211_tx_h_fragment);
1813 /* handlers after fragment must be aware of tx info fragmentation! */
1814 CALL_TXH(ieee80211_tx_h_stats);
1815 CALL_TXH(ieee80211_tx_h_encrypt);
1816 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1817 CALL_TXH(ieee80211_tx_h_calculate_duration);
1821 if (unlikely(res == TX_DROP)) {
1822 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1824 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1826 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1828 } else if (unlikely(res == TX_QUEUED)) {
1829 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1836 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1838 int r = invoke_tx_handlers_early(tx);
1842 return invoke_tx_handlers_late(tx);
1845 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1846 struct ieee80211_vif *vif, struct sk_buff *skb,
1847 int band, struct ieee80211_sta **sta)
1849 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1850 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1851 struct ieee80211_tx_data tx;
1852 struct sk_buff *skb2;
1854 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1858 info->control.vif = vif;
1859 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1861 if (invoke_tx_handlers(&tx))
1866 *sta = &tx.sta->sta;
1871 /* this function isn't suitable for fragmented data frames */
1872 skb2 = __skb_dequeue(&tx.skbs);
1873 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1874 ieee80211_free_txskb(hw, skb2);
1875 ieee80211_purge_tx_queue(hw, &tx.skbs);
1881 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1884 * Returns false if the frame couldn't be transmitted but was queued instead.
1886 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1887 struct sta_info *sta, struct sk_buff *skb,
1888 bool txpending, u32 txdata_flags)
1890 struct ieee80211_local *local = sdata->local;
1891 struct ieee80211_tx_data tx;
1892 ieee80211_tx_result res_prepare;
1893 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1897 if (unlikely(skb->len < 10)) {
1902 /* initialises tx */
1904 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1906 tx.flags |= txdata_flags;
1908 if (unlikely(res_prepare == TX_DROP)) {
1909 ieee80211_free_txskb(&local->hw, skb);
1911 } else if (unlikely(res_prepare == TX_QUEUED)) {
1915 /* set up hw_queue value early */
1916 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1917 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1919 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1921 if (invoke_tx_handlers_early(&tx))
1924 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1927 if (!invoke_tx_handlers_late(&tx))
1928 result = __ieee80211_tx(local, &tx.skbs, led_len,
1934 /* device xmit handlers */
1936 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1937 struct sk_buff *skb,
1938 int head_need, bool may_encrypt)
1940 struct ieee80211_local *local = sdata->local;
1941 struct ieee80211_hdr *hdr;
1945 hdr = (struct ieee80211_hdr *) skb->data;
1946 enc_tailroom = may_encrypt &&
1947 (sdata->crypto_tx_tailroom_needed_cnt ||
1948 ieee80211_is_mgmt(hdr->frame_control));
1951 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1952 tail_need -= skb_tailroom(skb);
1953 tail_need = max_t(int, tail_need, 0);
1956 if (skb_cloned(skb) &&
1957 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1958 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
1959 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1960 else if (head_need || tail_need)
1961 I802_DEBUG_INC(local->tx_expand_skb_head);
1965 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1966 wiphy_debug(local->hw.wiphy,
1967 "failed to reallocate TX buffer\n");
1974 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1975 struct sta_info *sta, struct sk_buff *skb,
1978 struct ieee80211_local *local = sdata->local;
1979 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1980 struct ieee80211_hdr *hdr;
1984 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1986 headroom = local->tx_headroom;
1988 headroom += sdata->encrypt_headroom;
1989 headroom -= skb_headroom(skb);
1990 headroom = max_t(int, 0, headroom);
1992 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1993 ieee80211_free_txskb(&local->hw, skb);
1997 hdr = (struct ieee80211_hdr *) skb->data;
1998 info->control.vif = &sdata->vif;
2000 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2001 if (ieee80211_is_data(hdr->frame_control) &&
2002 is_unicast_ether_addr(hdr->addr1)) {
2003 if (mesh_nexthop_resolve(sdata, skb))
2004 return; /* skb queued: don't free */
2006 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2010 ieee80211_set_qos_hdr(sdata, skb);
2011 ieee80211_tx(sdata, sta, skb, false, txdata_flags);
2014 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
2015 struct sk_buff *skb)
2017 struct ieee80211_radiotap_iterator iterator;
2018 struct ieee80211_radiotap_header *rthdr =
2019 (struct ieee80211_radiotap_header *) skb->data;
2020 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2021 struct ieee80211_supported_band *sband =
2022 local->hw.wiphy->bands[info->band];
2023 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2027 bool rate_found = false;
2028 u8 rate_retries = 0;
2030 u8 mcs_known, mcs_flags, mcs_bw;
2032 u8 vht_mcs = 0, vht_nss = 0;
2035 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2036 IEEE80211_TX_CTL_DONTFRAG;
2039 * for every radiotap entry that is present
2040 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2041 * entries present, or -EINVAL on error)
2045 ret = ieee80211_radiotap_iterator_next(&iterator);
2050 /* see if this argument is something we can use */
2051 switch (iterator.this_arg_index) {
2053 * You must take care when dereferencing iterator.this_arg
2054 * for multibyte types... the pointer is not aligned. Use
2055 * get_unaligned((type *)iterator.this_arg) to dereference
2056 * iterator.this_arg for type "type" safely on all arches.
2058 case IEEE80211_RADIOTAP_FLAGS:
2059 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2061 * this indicates that the skb we have been
2062 * handed has the 32-bit FCS CRC at the end...
2063 * we should react to that by snipping it off
2064 * because it will be recomputed and added
2067 if (skb->len < (iterator._max_length + FCS_LEN))
2070 skb_trim(skb, skb->len - FCS_LEN);
2072 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2073 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2074 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2075 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2078 case IEEE80211_RADIOTAP_TX_FLAGS:
2079 txflags = get_unaligned_le16(iterator.this_arg);
2080 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2081 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2084 case IEEE80211_RADIOTAP_RATE:
2085 rate = *iterator.this_arg;
2090 case IEEE80211_RADIOTAP_DATA_RETRIES:
2091 rate_retries = *iterator.this_arg;
2094 case IEEE80211_RADIOTAP_MCS:
2095 mcs_known = iterator.this_arg[0];
2096 mcs_flags = iterator.this_arg[1];
2097 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2101 rate = iterator.this_arg[2];
2102 rate_flags = IEEE80211_TX_RC_MCS;
2104 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2105 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2106 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2108 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2109 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2110 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2111 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2114 case IEEE80211_RADIOTAP_VHT:
2115 vht_known = get_unaligned_le16(iterator.this_arg);
2118 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2119 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2120 (iterator.this_arg[2] &
2121 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2122 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2124 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2125 if (iterator.this_arg[3] == 1)
2127 IEEE80211_TX_RC_40_MHZ_WIDTH;
2128 else if (iterator.this_arg[3] == 4)
2130 IEEE80211_TX_RC_80_MHZ_WIDTH;
2131 else if (iterator.this_arg[3] == 11)
2133 IEEE80211_TX_RC_160_MHZ_WIDTH;
2136 vht_mcs = iterator.this_arg[4] >> 4;
2137 vht_nss = iterator.this_arg[4] & 0xF;
2141 * Please update the file
2142 * Documentation/networking/mac80211-injection.txt
2143 * when parsing new fields here.
2151 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2155 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2157 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2158 info->control.rates[i].idx = -1;
2159 info->control.rates[i].flags = 0;
2160 info->control.rates[i].count = 0;
2163 if (rate_flags & IEEE80211_TX_RC_MCS) {
2164 info->control.rates[0].idx = rate;
2165 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2166 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2169 for (i = 0; i < sband->n_bitrates; i++) {
2170 if (rate * 5 != sband->bitrates[i].bitrate)
2173 info->control.rates[0].idx = i;
2178 if (info->control.rates[0].idx < 0)
2179 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2181 info->control.rates[0].flags = rate_flags;
2182 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2183 local->hw.max_rate_tries);
2187 * remove the radiotap header
2188 * iterator->_max_length was sanity-checked against
2189 * skb->len by iterator init
2191 skb_pull(skb, iterator._max_length);
2196 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2197 struct net_device *dev)
2199 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2200 struct ieee80211_chanctx_conf *chanctx_conf;
2201 struct ieee80211_radiotap_header *prthdr =
2202 (struct ieee80211_radiotap_header *)skb->data;
2203 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2204 struct ieee80211_hdr *hdr;
2205 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2206 struct cfg80211_chan_def *chandef;
2210 /* check for not even having the fixed radiotap header part */
2211 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2212 goto fail; /* too short to be possibly valid */
2214 /* is it a header version we can trust to find length from? */
2215 if (unlikely(prthdr->it_version))
2216 goto fail; /* only version 0 is supported */
2218 /* then there must be a radiotap header with a length we can use */
2219 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2221 /* does the skb contain enough to deliver on the alleged length? */
2222 if (unlikely(skb->len < len_rthdr))
2223 goto fail; /* skb too short for claimed rt header extent */
2226 * fix up the pointers accounting for the radiotap
2227 * header still being in there. We are being given
2228 * a precooked IEEE80211 header so no need for
2231 skb_set_mac_header(skb, len_rthdr);
2233 * these are just fixed to the end of the rt area since we
2234 * don't have any better information and at this point, nobody cares
2236 skb_set_network_header(skb, len_rthdr);
2237 skb_set_transport_header(skb, len_rthdr);
2239 if (skb->len < len_rthdr + 2)
2242 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2243 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2245 if (skb->len < len_rthdr + hdrlen)
2249 * Initialize skb->protocol if the injected frame is a data frame
2250 * carrying a rfc1042 header
2252 if (ieee80211_is_data(hdr->frame_control) &&
2253 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2254 u8 *payload = (u8 *)hdr + hdrlen;
2256 if (ether_addr_equal(payload, rfc1042_header))
2257 skb->protocol = cpu_to_be16((payload[6] << 8) |
2261 memset(info, 0, sizeof(*info));
2263 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2264 IEEE80211_TX_CTL_INJECTED;
2269 * We process outgoing injected frames that have a local address
2270 * we handle as though they are non-injected frames.
2271 * This code here isn't entirely correct, the local MAC address
2272 * isn't always enough to find the interface to use; for proper
2273 * VLAN/WDS support we will need a different mechanism (which
2274 * likely isn't going to be monitor interfaces).
2276 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2278 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2279 if (!ieee80211_sdata_running(tmp_sdata))
2281 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2282 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2283 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2285 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2291 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2292 if (!chanctx_conf) {
2293 tmp_sdata = rcu_dereference(local->monitor_sdata);
2296 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2300 chandef = &chanctx_conf->def;
2301 else if (!local->use_chanctx)
2302 chandef = &local->_oper_chandef;
2307 * Frame injection is not allowed if beaconing is not allowed
2308 * or if we need radar detection. Beaconing is usually not allowed when
2309 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2310 * Passive scan is also used in world regulatory domains where
2311 * your country is not known and as such it should be treated as
2312 * NO TX unless the channel is explicitly allowed in which case
2313 * your current regulatory domain would not have the passive scan
2316 * Since AP mode uses monitor interfaces to inject/TX management
2317 * frames we can make AP mode the exception to this rule once it
2318 * supports radar detection as its implementation can deal with
2319 * radar detection by itself. We can do that later by adding a
2320 * monitor flag interfaces used for AP support.
2322 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2326 info->band = chandef->chan->band;
2328 /* process and remove the injection radiotap header */
2329 if (!ieee80211_parse_tx_radiotap(local, skb))
2332 ieee80211_xmit(sdata, NULL, skb, 0);
2335 return NETDEV_TX_OK;
2341 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2344 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2346 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2348 return ethertype == ETH_P_TDLS &&
2350 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2353 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2354 struct sk_buff *skb,
2355 struct sta_info **sta_out)
2357 struct sta_info *sta;
2359 switch (sdata->vif.type) {
2360 case NL80211_IFTYPE_AP_VLAN:
2361 sta = rcu_dereference(sdata->u.vlan.sta);
2365 } else if (sdata->wdev.use_4addr) {
2369 case NL80211_IFTYPE_AP:
2370 case NL80211_IFTYPE_OCB:
2371 case NL80211_IFTYPE_ADHOC:
2372 if (is_multicast_ether_addr(skb->data)) {
2373 *sta_out = ERR_PTR(-ENOENT);
2376 sta = sta_info_get_bss(sdata, skb->data);
2378 case NL80211_IFTYPE_WDS:
2379 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2381 #ifdef CONFIG_MAC80211_MESH
2382 case NL80211_IFTYPE_MESH_POINT:
2383 /* determined much later */
2387 case NL80211_IFTYPE_STATION:
2388 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2389 sta = sta_info_get(sdata, skb->data);
2390 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2391 if (test_sta_flag(sta,
2392 WLAN_STA_TDLS_PEER_AUTH)) {
2398 * TDLS link during setup - throw out frames to
2399 * peer. Allow TDLS-setup frames to unauthorized
2400 * peers for the special case of a link teardown
2401 * after a TDLS sta is removed due to being
2404 if (!ieee80211_is_tdls_setup(skb))
2410 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2418 *sta_out = sta ?: ERR_PTR(-ENOENT);
2423 * ieee80211_build_hdr - build 802.11 header in the given frame
2424 * @sdata: virtual interface to build the header for
2425 * @skb: the skb to build the header in
2426 * @info_flags: skb flags to set
2428 * This function takes the skb with 802.3 header and reformats the header to
2429 * the appropriate IEEE 802.11 header based on which interface the packet is
2430 * being transmitted on.
2432 * Note that this function also takes care of the TX status request and
2433 * potential unsharing of the SKB - this needs to be interleaved with the
2436 * The function requires the read-side RCU lock held
2438 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2440 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2441 struct sk_buff *skb, u32 info_flags,
2442 struct sta_info *sta)
2444 struct ieee80211_local *local = sdata->local;
2445 struct ieee80211_tx_info *info;
2447 u16 ethertype, hdrlen, meshhdrlen = 0;
2449 struct ieee80211_hdr hdr;
2450 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2451 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2452 const u8 *encaps_data;
2453 int encaps_len, skip_header_bytes;
2454 bool wme_sta = false, authorized = false;
2458 struct ieee80211_chanctx_conf *chanctx_conf;
2459 struct ieee80211_sub_if_data *ap_sdata;
2460 enum nl80211_band band;
2466 /* convert Ethernet header to proper 802.11 header (based on
2467 * operation mode) */
2468 ethertype = (skb->data[12] << 8) | skb->data[13];
2469 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2471 switch (sdata->vif.type) {
2472 case NL80211_IFTYPE_AP_VLAN:
2473 if (sdata->wdev.use_4addr) {
2474 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2476 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2477 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2478 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2479 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2481 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2482 wme_sta = sta->sta.wme;
2484 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2486 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2487 if (!chanctx_conf) {
2491 band = chanctx_conf->def.chan->band;
2492 if (sdata->wdev.use_4addr)
2495 case NL80211_IFTYPE_AP:
2496 if (sdata->vif.type == NL80211_IFTYPE_AP)
2497 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2498 if (!chanctx_conf) {
2502 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2504 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2505 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2506 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2508 band = chanctx_conf->def.chan->band;
2510 case NL80211_IFTYPE_WDS:
2511 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2513 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2514 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2515 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2516 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2519 * This is the exception! WDS style interfaces are prohibited
2520 * when channel contexts are in used so this must be valid
2522 band = local->hw.conf.chandef.chan->band;
2524 #ifdef CONFIG_MAC80211_MESH
2525 case NL80211_IFTYPE_MESH_POINT:
2526 if (!is_multicast_ether_addr(skb->data)) {
2527 struct sta_info *next_hop;
2528 bool mpp_lookup = true;
2530 mpath = mesh_path_lookup(sdata, skb->data);
2533 next_hop = rcu_dereference(mpath->next_hop);
2535 !(mpath->flags & (MESH_PATH_ACTIVE |
2536 MESH_PATH_RESOLVING)))
2541 mppath = mpp_path_lookup(sdata, skb->data);
2543 mppath->exp_time = jiffies;
2546 if (mppath && mpath)
2547 mesh_path_del(sdata, mpath->dst);
2551 * Use address extension if it is a packet from
2552 * another interface or if we know the destination
2553 * is being proxied by a portal (i.e. portal address
2554 * differs from proxied address)
2556 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2557 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2558 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2559 skb->data, skb->data + ETH_ALEN);
2560 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2563 /* DS -> MBSS (802.11-2012 13.11.3.3).
2564 * For unicast with unknown forwarding information,
2565 * destination might be in the MBSS or if that fails
2566 * forwarded to another mesh gate. In either case
2567 * resolution will be handled in ieee80211_xmit(), so
2568 * leave the original DA. This also works for mcast */
2569 const u8 *mesh_da = skb->data;
2572 mesh_da = mppath->mpp;
2574 mesh_da = mpath->dst;
2576 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2577 mesh_da, sdata->vif.addr);
2578 if (is_multicast_ether_addr(mesh_da))
2579 /* DA TA mSA AE:SA */
2580 meshhdrlen = ieee80211_new_mesh_header(
2582 skb->data + ETH_ALEN, NULL);
2584 /* RA TA mDA mSA AE:DA SA */
2585 meshhdrlen = ieee80211_new_mesh_header(
2586 sdata, &mesh_hdr, skb->data,
2587 skb->data + ETH_ALEN);
2590 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2591 if (!chanctx_conf) {
2595 band = chanctx_conf->def.chan->band;
2598 case NL80211_IFTYPE_STATION:
2599 /* we already did checks when looking up the RA STA */
2600 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2604 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2605 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2606 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2608 } else if (sdata->u.mgd.use_4addr &&
2609 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2610 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2611 IEEE80211_FCTL_TODS);
2613 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2614 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2615 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2616 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2619 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2621 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2622 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2623 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2626 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2627 if (!chanctx_conf) {
2631 band = chanctx_conf->def.chan->band;
2633 case NL80211_IFTYPE_OCB:
2635 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2636 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2637 eth_broadcast_addr(hdr.addr3);
2639 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2640 if (!chanctx_conf) {
2644 band = chanctx_conf->def.chan->band;
2646 case NL80211_IFTYPE_ADHOC:
2648 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2649 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2650 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2652 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2653 if (!chanctx_conf) {
2657 band = chanctx_conf->def.chan->band;
2664 multicast = is_multicast_ether_addr(hdr.addr1);
2666 /* sta is always NULL for mesh */
2668 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2669 wme_sta = sta->sta.wme;
2670 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2671 /* For mesh, the use of the QoS header is mandatory */
2675 /* receiver does QoS (which also means we do) use it */
2677 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2682 * Drop unicast frames to unauthorised stations unless they are
2683 * EAPOL frames from the local station.
2685 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2686 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2687 !multicast && !authorized &&
2688 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2689 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2690 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2691 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2692 sdata->name, hdr.addr1);
2695 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2701 if (unlikely(!multicast && skb->sk &&
2702 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2703 struct sk_buff *ack_skb = skb_clone_sk(skb);
2706 unsigned long flags;
2709 spin_lock_irqsave(&local->ack_status_lock, flags);
2710 id = idr_alloc(&local->ack_status_frames, ack_skb,
2711 1, 0x10000, GFP_ATOMIC);
2712 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2716 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2724 * If the skb is shared we need to obtain our own copy.
2726 if (skb_shared(skb)) {
2727 struct sk_buff *tmp_skb = skb;
2729 /* can't happen -- skb is a clone if info_id != 0 */
2732 skb = skb_clone(skb, GFP_ATOMIC);
2741 hdr.frame_control = fc;
2742 hdr.duration_id = 0;
2745 skip_header_bytes = ETH_HLEN;
2746 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2747 encaps_data = bridge_tunnel_header;
2748 encaps_len = sizeof(bridge_tunnel_header);
2749 skip_header_bytes -= 2;
2750 } else if (ethertype >= ETH_P_802_3_MIN) {
2751 encaps_data = rfc1042_header;
2752 encaps_len = sizeof(rfc1042_header);
2753 skip_header_bytes -= 2;
2759 skb_pull(skb, skip_header_bytes);
2760 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2763 * So we need to modify the skb header and hence need a copy of
2764 * that. The head_need variable above doesn't, so far, include
2765 * the needed header space that we don't need right away. If we
2766 * can, then we don't reallocate right now but only after the
2767 * frame arrives at the master device (if it does...)
2769 * If we cannot, however, then we will reallocate to include all
2770 * the ever needed space. Also, if we need to reallocate it anyway,
2771 * make it big enough for everything we may ever need.
2774 if (head_need > 0 || skb_cloned(skb)) {
2775 head_need += sdata->encrypt_headroom;
2776 head_need += local->tx_headroom;
2777 head_need = max_t(int, 0, head_need);
2778 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2779 ieee80211_free_txskb(&local->hw, skb);
2781 return ERR_PTR(-ENOMEM);
2786 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2788 #ifdef CONFIG_MAC80211_MESH
2790 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2793 if (ieee80211_is_data_qos(fc)) {
2794 __le16 *qos_control;
2796 qos_control = skb_push(skb, 2);
2797 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2799 * Maybe we could actually set some fields here, for now just
2800 * initialise to zero to indicate no special operation.
2804 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2806 skb_reset_mac_header(skb);
2808 info = IEEE80211_SKB_CB(skb);
2809 memset(info, 0, sizeof(*info));
2811 info->flags = info_flags;
2812 info->ack_frame_id = info_id;
2818 return ERR_PTR(ret);
2822 * fast-xmit overview
2824 * The core idea of this fast-xmit is to remove per-packet checks by checking
2825 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2826 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2827 * much less work can be done per packet. For example, fragmentation must be
2828 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2831 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2832 * header and other data to aid packet processing in ieee80211_xmit_fast().
2834 * The most difficult part of this is that when any of these assumptions
2835 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2836 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2837 * since the per-packet code no longer checks the conditions. This is reflected
2838 * by the calls to these functions throughout the rest of the code, and must be
2839 * maintained if any of the TX path checks change.
2842 void ieee80211_check_fast_xmit(struct sta_info *sta)
2844 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2845 struct ieee80211_local *local = sta->local;
2846 struct ieee80211_sub_if_data *sdata = sta->sdata;
2847 struct ieee80211_hdr *hdr = (void *)build.hdr;
2848 struct ieee80211_chanctx_conf *chanctx_conf;
2851 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2854 /* Locking here protects both the pointer itself, and against concurrent
2855 * invocations winning data access races to, e.g., the key pointer that
2857 * Without it, the invocation of this function right after the key
2858 * pointer changes wouldn't be sufficient, as another CPU could access
2859 * the pointer, then stall, and then do the cache update after the CPU
2860 * that invalidated the key.
2861 * With the locking, such scenarios cannot happen as the check for the
2862 * key and the fast-tx assignment are done atomically, so the CPU that
2863 * modifies the key will either wait or other one will see the key
2864 * cleared/changed already.
2866 spin_lock_bh(&sta->lock);
2867 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2868 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2869 sdata->vif.type == NL80211_IFTYPE_STATION)
2872 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2875 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2876 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2877 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2878 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2881 if (sdata->noack_map)
2884 /* fast-xmit doesn't handle fragmentation at all */
2885 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2886 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2890 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2891 if (!chanctx_conf) {
2895 build.band = chanctx_conf->def.chan->band;
2898 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2900 switch (sdata->vif.type) {
2901 case NL80211_IFTYPE_ADHOC:
2903 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2904 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2905 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2908 case NL80211_IFTYPE_STATION:
2909 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2911 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2912 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2913 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2918 if (sdata->u.mgd.use_4addr) {
2919 /* non-regular ethertype cannot use the fastpath */
2920 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2921 IEEE80211_FCTL_TODS);
2923 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2924 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2925 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2926 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2930 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2932 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2933 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2934 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2937 case NL80211_IFTYPE_AP_VLAN:
2938 if (sdata->wdev.use_4addr) {
2939 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2940 IEEE80211_FCTL_TODS);
2942 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2943 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2944 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2945 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2950 case NL80211_IFTYPE_AP:
2951 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2953 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2954 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2955 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2959 /* not handled on fast-xmit */
2965 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2968 /* We store the key here so there's no point in using rcu_dereference()
2969 * but that's fine because the code that changes the pointers will call
2970 * this function after doing so. For a single CPU that would be enough,
2971 * for multiple see the comment above.
2973 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2975 build.key = rcu_access_pointer(sdata->default_unicast_key);
2977 bool gen_iv, iv_spc, mmic;
2979 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2980 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2981 mmic = build.key->conf.flags &
2982 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
2983 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
2985 /* don't handle software crypto */
2986 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2989 /* Key is being removed */
2990 if (build.key->flags & KEY_FLAG_TAINTED)
2993 switch (build.key->conf.cipher) {
2994 case WLAN_CIPHER_SUITE_CCMP:
2995 case WLAN_CIPHER_SUITE_CCMP_256:
2996 /* add fixed key ID */
2998 (build.hdr + build.hdr_len)[3] =
2999 0x20 | (build.key->conf.keyidx << 6);
3000 build.pn_offs = build.hdr_len;
3002 if (gen_iv || iv_spc)
3003 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
3005 case WLAN_CIPHER_SUITE_GCMP:
3006 case WLAN_CIPHER_SUITE_GCMP_256:
3007 /* add fixed key ID */
3009 (build.hdr + build.hdr_len)[3] =
3010 0x20 | (build.key->conf.keyidx << 6);
3011 build.pn_offs = build.hdr_len;
3013 if (gen_iv || iv_spc)
3014 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3016 case WLAN_CIPHER_SUITE_TKIP:
3017 /* cannot handle MMIC or IV generation in xmit-fast */
3021 build.hdr_len += IEEE80211_TKIP_IV_LEN;
3023 case WLAN_CIPHER_SUITE_WEP40:
3024 case WLAN_CIPHER_SUITE_WEP104:
3025 /* cannot handle IV generation in fast-xmit */
3029 build.hdr_len += IEEE80211_WEP_IV_LEN;
3031 case WLAN_CIPHER_SUITE_AES_CMAC:
3032 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3033 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3034 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3036 "management cipher suite 0x%x enabled for data\n",
3037 build.key->conf.cipher);
3040 /* we don't know how to generate IVs for this at all */
3041 if (WARN_ON(gen_iv))
3043 /* pure hardware keys are OK, of course */
3044 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
3046 /* cipher scheme might require space allocation */
3048 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
3051 build.hdr_len += build.key->conf.iv_len;
3054 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3057 hdr->frame_control = fc;
3059 memcpy(build.hdr + build.hdr_len,
3060 rfc1042_header, sizeof(rfc1042_header));
3061 build.hdr_len += sizeof(rfc1042_header);
3063 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3064 /* if the kmemdup fails, continue w/o fast_tx */
3069 /* we might have raced against another call to this function */
3070 old = rcu_dereference_protected(sta->fast_tx,
3071 lockdep_is_held(&sta->lock));
3072 rcu_assign_pointer(sta->fast_tx, fast_tx);
3074 kfree_rcu(old, rcu_head);
3075 spin_unlock_bh(&sta->lock);
3078 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3080 struct sta_info *sta;
3083 list_for_each_entry_rcu(sta, &local->sta_list, list)
3084 ieee80211_check_fast_xmit(sta);
3088 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3090 struct ieee80211_local *local = sdata->local;
3091 struct sta_info *sta;
3095 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3096 if (sdata != sta->sdata &&
3097 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3099 ieee80211_check_fast_xmit(sta);
3105 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3107 struct ieee80211_fast_tx *fast_tx;
3109 spin_lock_bh(&sta->lock);
3110 fast_tx = rcu_dereference_protected(sta->fast_tx,
3111 lockdep_is_held(&sta->lock));
3112 RCU_INIT_POINTER(sta->fast_tx, NULL);
3113 spin_unlock_bh(&sta->lock);
3116 kfree_rcu(fast_tx, rcu_head);
3119 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3120 struct sk_buff *skb, int headroom)
3122 if (skb_headroom(skb) < headroom) {
3123 I802_DEBUG_INC(local->tx_expand_skb_head);
3125 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3126 wiphy_debug(local->hw.wiphy,
3127 "failed to reallocate TX buffer\n");
3135 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3136 struct ieee80211_fast_tx *fast_tx,
3137 struct sk_buff *skb)
3139 struct ieee80211_local *local = sdata->local;
3140 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3141 struct ieee80211_hdr *hdr;
3142 struct ethhdr *amsdu_hdr;
3143 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3144 int subframe_len = skb->len - hdr_len;
3146 u8 *qc, *h_80211_src, *h_80211_dst;
3149 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3152 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3155 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr)))
3158 data = skb_push(skb, sizeof(*amsdu_hdr));
3159 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3161 amsdu_hdr = data + hdr_len;
3162 /* h_80211_src/dst is addr* field within hdr */
3163 h_80211_src = data + fast_tx->sa_offs;
3164 h_80211_dst = data + fast_tx->da_offs;
3166 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3167 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3168 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3170 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3171 * fields needs to be changed to BSSID for A-MSDU frames depending
3172 * on FromDS/ToDS values.
3174 switch (sdata->vif.type) {
3175 case NL80211_IFTYPE_STATION:
3176 bssid = sdata->u.mgd.bssid;
3178 case NL80211_IFTYPE_AP:
3179 case NL80211_IFTYPE_AP_VLAN:
3180 bssid = sdata->vif.addr;
3186 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3187 ether_addr_copy(h_80211_src, bssid);
3189 if (bssid && ieee80211_has_tods(hdr->frame_control))
3190 ether_addr_copy(h_80211_dst, bssid);
3192 qc = ieee80211_get_qos_ctl(hdr);
3193 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3195 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3200 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3201 struct sta_info *sta,
3202 struct ieee80211_fast_tx *fast_tx,
3203 struct sk_buff *skb)
3205 struct ieee80211_local *local = sdata->local;
3206 struct fq *fq = &local->fq;
3208 struct fq_flow *flow;
3209 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3210 struct ieee80211_txq *txq = sta->sta.txq[tid];
3211 struct txq_info *txqi;
3212 struct sk_buff **frag_tail, *head;
3213 int subframe_len = skb->len - ETH_ALEN;
3214 u8 max_subframes = sta->sta.max_amsdu_subframes;
3215 int max_frags = local->hw.max_tx_fragments;
3216 int max_amsdu_len = sta->sta.max_amsdu_len;
3220 unsigned int orig_len;
3221 int n = 2, nfrags, pad = 0;
3224 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3227 if (skb_is_gso(skb))
3233 txqi = to_txq_info(txq);
3234 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3237 if (sta->sta.max_rc_amsdu_len)
3238 max_amsdu_len = min_t(int, max_amsdu_len,
3239 sta->sta.max_rc_amsdu_len);
3241 if (sta->sta.max_tid_amsdu_len[tid])
3242 max_amsdu_len = min_t(int, max_amsdu_len,
3243 sta->sta.max_tid_amsdu_len[tid]);
3245 spin_lock_bh(&fq->lock);
3247 /* TODO: Ideally aggregation should be done on dequeue to remain
3248 * responsive to environment changes.
3252 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3253 head = skb_peek_tail(&flow->queue);
3254 if (!head || skb_is_gso(head))
3257 orig_len = head->len;
3259 if (skb->len + head->len > max_amsdu_len)
3262 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3263 nfrags += 1 + skb_shinfo(head)->nr_frags;
3264 frag_tail = &skb_shinfo(head)->frag_list;
3265 while (*frag_tail) {
3266 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3267 frag_tail = &(*frag_tail)->next;
3271 if (max_subframes && n > max_subframes)
3274 if (max_frags && nfrags > max_frags)
3277 if (!drv_can_aggregate_in_amsdu(local, head, skb))
3280 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3284 * Pad out the previous subframe to a multiple of 4 by adding the
3285 * padding to the next one, that's being added. Note that head->len
3286 * is the length of the full A-MSDU, but that works since each time
3287 * we add a new subframe we pad out the previous one to a multiple
3288 * of 4 and thus it no longer matters in the next round.
3290 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3291 if ((head->len - hdrlen) & 3)
3292 pad = 4 - ((head->len - hdrlen) & 3);
3294 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3299 data = skb_push(skb, ETH_ALEN + 2);
3300 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3302 data += 2 * ETH_ALEN;
3303 len = cpu_to_be16(subframe_len);
3304 memcpy(data, &len, 2);
3305 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3307 memset(skb_push(skb, pad), 0, pad);
3309 head->len += skb->len;
3310 head->data_len += skb->len;
3314 if (head->len != orig_len) {
3315 flow->backlog += head->len - orig_len;
3316 tin->backlog_bytes += head->len - orig_len;
3318 fq_recalc_backlog(fq, tin, flow);
3321 spin_unlock_bh(&fq->lock);
3327 * Can be called while the sta lock is held. Anything that can cause packets to
3328 * be generated will cause deadlock!
3330 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3331 struct sta_info *sta, u8 pn_offs,
3332 struct ieee80211_key *key,
3333 struct sk_buff *skb)
3335 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3336 struct ieee80211_hdr *hdr = (void *)skb->data;
3337 u8 tid = IEEE80211_NUM_TIDS;
3340 info->control.hw_key = &key->conf;
3342 ieee80211_tx_stats(skb->dev, skb->len);
3344 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3345 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3346 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3348 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3349 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3350 sdata->sequence_number += 0x10;
3353 if (skb_shinfo(skb)->gso_size)
3354 sta->tx_stats.msdu[tid] +=
3355 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3357 sta->tx_stats.msdu[tid]++;
3359 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3361 /* statistics normally done by ieee80211_tx_h_stats (but that
3362 * has to consider fragmentation, so is more complex)
3364 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3365 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3369 u8 *crypto_hdr = skb->data + pn_offs;
3371 switch (key->conf.cipher) {
3372 case WLAN_CIPHER_SUITE_CCMP:
3373 case WLAN_CIPHER_SUITE_CCMP_256:
3374 case WLAN_CIPHER_SUITE_GCMP:
3375 case WLAN_CIPHER_SUITE_GCMP_256:
3376 pn = atomic64_inc_return(&key->conf.tx_pn);
3378 crypto_hdr[1] = pn >> 8;
3379 crypto_hdr[4] = pn >> 16;
3380 crypto_hdr[5] = pn >> 24;
3381 crypto_hdr[6] = pn >> 32;
3382 crypto_hdr[7] = pn >> 40;
3388 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3389 struct sta_info *sta,
3390 struct ieee80211_fast_tx *fast_tx,
3391 struct sk_buff *skb)
3393 struct ieee80211_local *local = sdata->local;
3394 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3395 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3396 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3398 struct ieee80211_tx_info *info;
3399 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3400 struct ieee80211_tx_data tx;
3401 ieee80211_tx_result r;
3402 struct tid_ampdu_tx *tid_tx = NULL;
3403 u8 tid = IEEE80211_NUM_TIDS;
3405 /* control port protocol needs a lot of special handling */
3406 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3409 /* only RFC 1042 SNAP */
3410 if (ethertype < ETH_P_802_3_MIN)
3413 /* don't handle TX status request here either */
3414 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3417 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3418 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3419 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3421 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3423 if (tid_tx->timeout)
3424 tid_tx->last_tx = jiffies;
3428 /* after this point (skb is modified) we cannot return false */
3430 if (skb_shared(skb)) {
3431 struct sk_buff *tmp_skb = skb;
3433 skb = skb_clone(skb, GFP_ATOMIC);
3440 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3441 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3444 /* will not be crypto-handled beyond what we do here, so use false
3445 * as the may-encrypt argument for the resize to not account for
3446 * more room than we already have in 'extra_head'
3448 if (unlikely(ieee80211_skb_resize(sdata, skb,
3449 max_t(int, extra_head + hw_headroom -
3450 skb_headroom(skb), 0),
3456 memcpy(ð, skb->data, ETH_HLEN - 2);
3457 hdr = skb_push(skb, extra_head);
3458 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3459 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3460 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3462 info = IEEE80211_SKB_CB(skb);
3463 memset(info, 0, sizeof(*info));
3464 info->band = fast_tx->band;
3465 info->control.vif = &sdata->vif;
3466 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3467 IEEE80211_TX_CTL_DONTFRAG |
3468 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3469 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3471 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3472 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3473 *ieee80211_get_qos_ctl(hdr) = tid;
3476 __skb_queue_head_init(&tx.skbs);
3478 tx.flags = IEEE80211_TX_UNICAST;
3482 tx.key = fast_tx->key;
3484 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3486 r = ieee80211_tx_h_rate_ctrl(&tx);
3490 if (r != TX_CONTINUE) {
3497 if (ieee80211_queue_skb(local, sdata, sta, skb))
3500 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3503 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3504 sdata = container_of(sdata->bss,
3505 struct ieee80211_sub_if_data, u.ap);
3507 __skb_queue_tail(&tx.skbs, skb);
3508 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3512 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3513 struct ieee80211_txq *txq)
3515 struct ieee80211_local *local = hw_to_local(hw);
3516 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3517 struct ieee80211_hdr *hdr;
3518 struct sk_buff *skb = NULL;
3519 struct fq *fq = &local->fq;
3520 struct fq_tin *tin = &txqi->tin;
3521 struct ieee80211_tx_info *info;
3522 struct ieee80211_tx_data tx;
3523 ieee80211_tx_result r;
3524 struct ieee80211_vif *vif = txq->vif;
3526 spin_lock_bh(&fq->lock);
3528 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ||
3529 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags))
3532 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) {
3533 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags);
3537 /* Make sure fragments stay together. */
3538 skb = __skb_dequeue(&txqi->frags);
3543 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3547 hdr = (struct ieee80211_hdr *)skb->data;
3548 info = IEEE80211_SKB_CB(skb);
3550 memset(&tx, 0, sizeof(tx));
3551 __skb_queue_head_init(&tx.skbs);
3554 tx.sdata = vif_to_sdata(info->control.vif);
3557 tx.sta = container_of(txq->sta, struct sta_info, sta);
3560 * The key can be removed while the packet was queued, so need to call
3561 * this here to get the current key.
3563 r = ieee80211_tx_h_select_key(&tx);
3564 if (r != TX_CONTINUE) {
3565 ieee80211_free_txskb(&local->hw, skb);
3569 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3570 info->flags |= IEEE80211_TX_CTL_AMPDU;
3572 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3574 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3575 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3580 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3581 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3583 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3586 if (invoke_tx_handlers_late(&tx))
3589 skb = __skb_dequeue(&tx.skbs);
3591 if (!skb_queue_empty(&tx.skbs))
3592 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3595 if (skb_has_frag_list(skb) &&
3596 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3597 if (skb_linearize(skb)) {
3598 ieee80211_free_txskb(&local->hw, skb);
3603 switch (tx.sdata->vif.type) {
3604 case NL80211_IFTYPE_MONITOR:
3605 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3606 vif = &tx.sdata->vif;
3609 tx.sdata = rcu_dereference(local->monitor_sdata);
3611 vif = &tx.sdata->vif;
3613 vif->hw_queue[skb_get_queue_mapping(skb)];
3614 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3615 ieee80211_free_txskb(&local->hw, skb);
3621 case NL80211_IFTYPE_AP_VLAN:
3622 tx.sdata = container_of(tx.sdata->bss,
3623 struct ieee80211_sub_if_data, u.ap);
3626 vif = &tx.sdata->vif;
3630 IEEE80211_SKB_CB(skb)->control.vif = vif;
3633 spin_unlock_bh(&fq->lock);
3637 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3639 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3640 struct net_device *dev,
3643 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3644 struct sta_info *sta;
3645 struct sk_buff *next;
3647 if (unlikely(skb->len < ETH_HLEN)) {
3654 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3657 if (!IS_ERR_OR_NULL(sta)) {
3658 struct ieee80211_fast_tx *fast_tx;
3660 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
3662 fast_tx = rcu_dereference(sta->fast_tx);
3665 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3669 if (skb_is_gso(skb)) {
3670 struct sk_buff *segs;
3672 segs = skb_gso_segment(skb, 0);
3680 /* we cannot process non-linear frames on this path */
3681 if (skb_linearize(skb)) {
3686 /* the frame could be fragmented, software-encrypted, and other
3687 * things so we cannot really handle checksum offload with it -
3688 * fix it up in software before we handle anything else.
3690 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3691 skb_set_transport_header(skb,
3692 skb_checksum_start_offset(skb));
3693 if (skb_checksum_help(skb))
3706 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3710 ieee80211_tx_stats(dev, skb->len);
3712 ieee80211_xmit(sdata, sta, skb, 0);
3721 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3726 err = skb_ensure_writable(skb, ETH_HLEN);
3730 eth = (void *)skb->data;
3731 ether_addr_copy(eth->h_dest, sta->sta.addr);
3736 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3737 struct net_device *dev)
3739 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3740 const struct ethhdr *eth = (void *)skb->data;
3741 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3744 if (likely(!is_multicast_ether_addr(eth->h_dest)))
3747 switch (sdata->vif.type) {
3748 case NL80211_IFTYPE_AP_VLAN:
3749 if (sdata->u.vlan.sta)
3751 if (sdata->wdev.use_4addr)
3754 case NL80211_IFTYPE_AP:
3755 /* check runtime toggle for this bss */
3756 if (!sdata->bss->multicast_to_unicast)
3763 /* multicast to unicast conversion only for some payload */
3764 ethertype = eth->h_proto;
3765 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3766 ethertype = ethvlan->h_vlan_encapsulated_proto;
3767 switch (ethertype) {
3768 case htons(ETH_P_ARP):
3769 case htons(ETH_P_IP):
3770 case htons(ETH_P_IPV6):
3780 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3781 struct sk_buff_head *queue)
3783 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3784 struct ieee80211_local *local = sdata->local;
3785 const struct ethhdr *eth = (struct ethhdr *)skb->data;
3786 struct sta_info *sta, *first = NULL;
3787 struct sk_buff *cloned_skb;
3791 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3792 if (sdata != sta->sdata)
3793 /* AP-VLAN mismatch */
3795 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3796 /* do not send back to source */
3802 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3805 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3806 dev_kfree_skb(cloned_skb);
3809 __skb_queue_tail(queue, cloned_skb);
3812 if (likely(first)) {
3813 if (unlikely(ieee80211_change_da(skb, first)))
3815 __skb_queue_tail(queue, skb);
3817 /* no STA connected, drop */
3824 __skb_queue_purge(queue);
3825 __skb_queue_tail(queue, skb);
3831 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3832 * @skb: packet to be sent
3833 * @dev: incoming interface
3835 * On failure skb will be freed.
3837 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3838 struct net_device *dev)
3840 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3841 struct sk_buff_head queue;
3843 __skb_queue_head_init(&queue);
3844 ieee80211_convert_to_unicast(skb, dev, &queue);
3845 while ((skb = __skb_dequeue(&queue)))
3846 __ieee80211_subif_start_xmit(skb, dev, 0);
3848 __ieee80211_subif_start_xmit(skb, dev, 0);
3851 return NETDEV_TX_OK;
3855 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3856 struct sk_buff *skb, u32 info_flags)
3858 struct ieee80211_hdr *hdr;
3859 struct ieee80211_tx_data tx = {
3860 .local = sdata->local,
3863 struct sta_info *sta;
3867 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3869 skb = ERR_PTR(-EINVAL);
3873 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3877 hdr = (void *)skb->data;
3878 tx.sta = sta_info_get(sdata, hdr->addr1);
3881 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3884 return ERR_PTR(-EINVAL);
3893 * ieee80211_clear_tx_pending may not be called in a context where
3894 * it is possible that it packets could come in again.
3896 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3898 struct sk_buff *skb;
3901 for (i = 0; i < local->hw.queues; i++) {
3902 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3903 ieee80211_free_txskb(&local->hw, skb);
3908 * Returns false if the frame couldn't be transmitted but was queued instead,
3909 * which in this case means re-queued -- take as an indication to stop sending
3910 * more pending frames.
3912 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3913 struct sk_buff *skb)
3915 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3916 struct ieee80211_sub_if_data *sdata;
3917 struct sta_info *sta;
3918 struct ieee80211_hdr *hdr;
3920 struct ieee80211_chanctx_conf *chanctx_conf;
3922 sdata = vif_to_sdata(info->control.vif);
3924 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3925 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3926 if (unlikely(!chanctx_conf)) {
3930 info->band = chanctx_conf->def.chan->band;
3931 result = ieee80211_tx(sdata, NULL, skb, true, 0);
3933 struct sk_buff_head skbs;
3935 __skb_queue_head_init(&skbs);
3936 __skb_queue_tail(&skbs, skb);
3938 hdr = (struct ieee80211_hdr *)skb->data;
3939 sta = sta_info_get(sdata, hdr->addr1);
3941 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3948 * Transmit all pending packets. Called from tasklet.
3950 void ieee80211_tx_pending(unsigned long data)
3952 struct ieee80211_local *local = (struct ieee80211_local *)data;
3953 unsigned long flags;
3959 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3960 for (i = 0; i < local->hw.queues; i++) {
3962 * If queue is stopped by something other than due to pending
3963 * frames, or we have no pending frames, proceed to next queue.
3965 if (local->queue_stop_reasons[i] ||
3966 skb_queue_empty(&local->pending[i]))
3969 while (!skb_queue_empty(&local->pending[i])) {
3970 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3971 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3973 if (WARN_ON(!info->control.vif)) {
3974 ieee80211_free_txskb(&local->hw, skb);
3978 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3981 txok = ieee80211_tx_pending_skb(local, skb);
3982 spin_lock_irqsave(&local->queue_stop_reason_lock,
3988 if (skb_queue_empty(&local->pending[i]))
3989 ieee80211_propagate_queue_wake(local, i);
3991 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3996 /* functions for drivers to get certain frames */
3998 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3999 struct ps_data *ps, struct sk_buff *skb,
4004 int i, have_bits = 0, n1, n2;
4006 /* Generate bitmap for TIM only if there are any STAs in power save
4008 if (atomic_read(&ps->num_sta_ps) > 0)
4009 /* in the hope that this is faster than
4010 * checking byte-for-byte */
4011 have_bits = !bitmap_empty((unsigned long *)ps->tim,
4012 IEEE80211_MAX_AID+1);
4014 if (ps->dtim_count == 0)
4015 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
4020 tim = pos = skb_put(skb, 6);
4021 *pos++ = WLAN_EID_TIM;
4023 *pos++ = ps->dtim_count;
4024 *pos++ = sdata->vif.bss_conf.dtim_period;
4026 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
4029 ps->dtim_bc_mc = aid0 == 1;
4032 /* Find largest even number N1 so that bits numbered 1 through
4033 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4034 * (N2 + 1) x 8 through 2007 are 0. */
4036 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4043 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4050 /* Bitmap control */
4052 /* Part Virt Bitmap */
4053 skb_put(skb, n2 - n1);
4054 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
4056 tim[1] = n2 - n1 + 4;
4058 *pos++ = aid0; /* Bitmap control */
4059 *pos++ = 0; /* Part Virt Bitmap */
4063 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4064 struct ps_data *ps, struct sk_buff *skb,
4067 struct ieee80211_local *local = sdata->local;
4070 * Not very nice, but we want to allow the driver to call
4071 * ieee80211_beacon_get() as a response to the set_tim()
4072 * callback. That, however, is already invoked under the
4073 * sta_lock to guarantee consistent and race-free update
4074 * of the tim bitmap in mac80211 and the driver.
4076 if (local->tim_in_locked_section) {
4077 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4079 spin_lock_bh(&local->tim_lock);
4080 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4081 spin_unlock_bh(&local->tim_lock);
4087 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
4088 struct beacon_data *beacon)
4090 struct probe_resp *resp;
4092 size_t beacon_data_len;
4094 u8 count = beacon->csa_current_counter;
4096 switch (sdata->vif.type) {
4097 case NL80211_IFTYPE_AP:
4098 beacon_data = beacon->tail;
4099 beacon_data_len = beacon->tail_len;
4101 case NL80211_IFTYPE_ADHOC:
4102 beacon_data = beacon->head;
4103 beacon_data_len = beacon->head_len;
4105 case NL80211_IFTYPE_MESH_POINT:
4106 beacon_data = beacon->head;
4107 beacon_data_len = beacon->head_len;
4114 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
4115 resp = rcu_dereference(sdata->u.ap.probe_resp);
4117 if (beacon->csa_counter_offsets[i]) {
4118 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
4124 beacon_data[beacon->csa_counter_offsets[i]] = count;
4127 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
4128 resp->data[resp->csa_counter_offsets[i]] = count;
4133 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
4135 beacon->csa_current_counter--;
4137 /* the counter should never reach 0 */
4138 WARN_ON_ONCE(!beacon->csa_current_counter);
4140 return beacon->csa_current_counter;
4143 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4145 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4146 struct beacon_data *beacon = NULL;
4151 if (sdata->vif.type == NL80211_IFTYPE_AP)
4152 beacon = rcu_dereference(sdata->u.ap.beacon);
4153 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4154 beacon = rcu_dereference(sdata->u.ibss.presp);
4155 else if (ieee80211_vif_is_mesh(&sdata->vif))
4156 beacon = rcu_dereference(sdata->u.mesh.beacon);
4161 count = __ieee80211_csa_update_counter(beacon);
4167 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4169 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter)
4171 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4172 struct beacon_data *beacon = NULL;
4176 if (sdata->vif.type == NL80211_IFTYPE_AP)
4177 beacon = rcu_dereference(sdata->u.ap.beacon);
4178 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4179 beacon = rcu_dereference(sdata->u.ibss.presp);
4180 else if (ieee80211_vif_is_mesh(&sdata->vif))
4181 beacon = rcu_dereference(sdata->u.mesh.beacon);
4186 if (counter < beacon->csa_current_counter)
4187 beacon->csa_current_counter = counter;
4192 EXPORT_SYMBOL(ieee80211_csa_set_counter);
4194 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4196 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4197 struct beacon_data *beacon = NULL;
4199 size_t beacon_data_len;
4202 if (!ieee80211_sdata_running(sdata))
4206 if (vif->type == NL80211_IFTYPE_AP) {
4207 struct ieee80211_if_ap *ap = &sdata->u.ap;
4209 beacon = rcu_dereference(ap->beacon);
4210 if (WARN_ON(!beacon || !beacon->tail))
4212 beacon_data = beacon->tail;
4213 beacon_data_len = beacon->tail_len;
4214 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4215 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4217 beacon = rcu_dereference(ifibss->presp);
4221 beacon_data = beacon->head;
4222 beacon_data_len = beacon->head_len;
4223 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4224 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4226 beacon = rcu_dereference(ifmsh->beacon);
4230 beacon_data = beacon->head;
4231 beacon_data_len = beacon->head_len;
4237 if (!beacon->csa_counter_offsets[0])
4240 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4243 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4250 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4252 static struct sk_buff *
4253 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4254 struct ieee80211_vif *vif,
4255 struct ieee80211_mutable_offsets *offs,
4258 struct ieee80211_local *local = hw_to_local(hw);
4259 struct beacon_data *beacon = NULL;
4260 struct sk_buff *skb = NULL;
4261 struct ieee80211_tx_info *info;
4262 struct ieee80211_sub_if_data *sdata = NULL;
4263 enum nl80211_band band;
4264 struct ieee80211_tx_rate_control txrc;
4265 struct ieee80211_chanctx_conf *chanctx_conf;
4266 int csa_off_base = 0;
4270 sdata = vif_to_sdata(vif);
4271 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4273 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4277 memset(offs, 0, sizeof(*offs));
4279 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4280 struct ieee80211_if_ap *ap = &sdata->u.ap;
4282 beacon = rcu_dereference(ap->beacon);
4284 if (beacon->csa_counter_offsets[0]) {
4286 __ieee80211_csa_update_counter(beacon);
4288 ieee80211_set_csa(sdata, beacon);
4292 * headroom, head length,
4293 * tail length and maximum TIM length
4295 skb = dev_alloc_skb(local->tx_headroom +
4297 beacon->tail_len + 256 +
4298 local->hw.extra_beacon_tailroom);
4302 skb_reserve(skb, local->tx_headroom);
4303 skb_put_data(skb, beacon->head, beacon->head_len);
4305 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4309 offs->tim_offset = beacon->head_len;
4310 offs->tim_length = skb->len - beacon->head_len;
4312 /* for AP the csa offsets are from tail */
4313 csa_off_base = skb->len;
4317 skb_put_data(skb, beacon->tail,
4321 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4322 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4323 struct ieee80211_hdr *hdr;
4325 beacon = rcu_dereference(ifibss->presp);
4329 if (beacon->csa_counter_offsets[0]) {
4331 __ieee80211_csa_update_counter(beacon);
4333 ieee80211_set_csa(sdata, beacon);
4336 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4337 local->hw.extra_beacon_tailroom);
4340 skb_reserve(skb, local->tx_headroom);
4341 skb_put_data(skb, beacon->head, beacon->head_len);
4343 hdr = (struct ieee80211_hdr *) skb->data;
4344 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4345 IEEE80211_STYPE_BEACON);
4346 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4347 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4349 beacon = rcu_dereference(ifmsh->beacon);
4353 if (beacon->csa_counter_offsets[0]) {
4355 /* TODO: For mesh csa_counter is in TU, so
4356 * decrementing it by one isn't correct, but
4357 * for now we leave it consistent with overall
4358 * mac80211's behavior.
4360 __ieee80211_csa_update_counter(beacon);
4362 ieee80211_set_csa(sdata, beacon);
4365 if (ifmsh->sync_ops)
4366 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4368 skb = dev_alloc_skb(local->tx_headroom +
4372 local->hw.extra_beacon_tailroom);
4375 skb_reserve(skb, local->tx_headroom);
4376 skb_put_data(skb, beacon->head, beacon->head_len);
4377 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4380 offs->tim_offset = beacon->head_len;
4381 offs->tim_length = skb->len - beacon->head_len;
4384 skb_put_data(skb, beacon->tail, beacon->tail_len);
4391 if (offs && beacon) {
4394 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4395 u16 csa_off = beacon->csa_counter_offsets[i];
4400 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4404 band = chanctx_conf->def.chan->band;
4406 info = IEEE80211_SKB_CB(skb);
4408 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4409 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4412 memset(&txrc, 0, sizeof(txrc));
4414 txrc.sband = local->hw.wiphy->bands[band];
4415 txrc.bss_conf = &sdata->vif.bss_conf;
4417 txrc.reported_rate.idx = -1;
4418 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4420 rate_control_get_rate(sdata, NULL, &txrc);
4422 info->control.vif = vif;
4424 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4425 IEEE80211_TX_CTL_ASSIGN_SEQ |
4426 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4434 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4435 struct ieee80211_vif *vif,
4436 struct ieee80211_mutable_offsets *offs)
4438 return __ieee80211_beacon_get(hw, vif, offs, true);
4440 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4442 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4443 struct ieee80211_vif *vif,
4444 u16 *tim_offset, u16 *tim_length)
4446 struct ieee80211_mutable_offsets offs = {};
4447 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4448 struct sk_buff *copy;
4449 struct ieee80211_supported_band *sband;
4456 *tim_offset = offs.tim_offset;
4459 *tim_length = offs.tim_length;
4461 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4462 !hw_to_local(hw)->monitors)
4465 /* send a copy to monitor interfaces */
4466 copy = skb_copy(bcn, GFP_ATOMIC);
4470 shift = ieee80211_vif_get_shift(vif);
4471 sband = ieee80211_get_sband(vif_to_sdata(vif));
4475 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4479 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4481 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4482 struct ieee80211_vif *vif)
4484 struct ieee80211_if_ap *ap = NULL;
4485 struct sk_buff *skb = NULL;
4486 struct probe_resp *presp = NULL;
4487 struct ieee80211_hdr *hdr;
4488 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4490 if (sdata->vif.type != NL80211_IFTYPE_AP)
4496 presp = rcu_dereference(ap->probe_resp);
4500 skb = dev_alloc_skb(presp->len);
4504 skb_put_data(skb, presp->data, presp->len);
4506 hdr = (struct ieee80211_hdr *) skb->data;
4507 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4513 EXPORT_SYMBOL(ieee80211_proberesp_get);
4515 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4516 struct ieee80211_vif *vif)
4518 struct ieee80211_sub_if_data *sdata;
4519 struct ieee80211_if_managed *ifmgd;
4520 struct ieee80211_pspoll *pspoll;
4521 struct ieee80211_local *local;
4522 struct sk_buff *skb;
4524 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4527 sdata = vif_to_sdata(vif);
4528 ifmgd = &sdata->u.mgd;
4529 local = sdata->local;
4531 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4535 skb_reserve(skb, local->hw.extra_tx_headroom);
4537 pspoll = skb_put_zero(skb, sizeof(*pspoll));
4538 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4539 IEEE80211_STYPE_PSPOLL);
4540 pspoll->aid = cpu_to_le16(ifmgd->aid);
4542 /* aid in PS-Poll has its two MSBs each set to 1 */
4543 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4545 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4546 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4550 EXPORT_SYMBOL(ieee80211_pspoll_get);
4552 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4553 struct ieee80211_vif *vif,
4556 struct ieee80211_hdr_3addr *nullfunc;
4557 struct ieee80211_sub_if_data *sdata;
4558 struct ieee80211_if_managed *ifmgd;
4559 struct ieee80211_local *local;
4560 struct sk_buff *skb;
4563 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4566 sdata = vif_to_sdata(vif);
4567 ifmgd = &sdata->u.mgd;
4568 local = sdata->local;
4571 struct sta_info *sta;
4574 sta = sta_info_get(sdata, ifmgd->bssid);
4575 qos = sta && sta->sta.wme;
4579 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4580 sizeof(*nullfunc) + 2);
4584 skb_reserve(skb, local->hw.extra_tx_headroom);
4586 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4587 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4588 IEEE80211_STYPE_NULLFUNC |
4589 IEEE80211_FCTL_TODS);
4591 __le16 qoshdr = cpu_to_le16(7);
4593 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
4594 IEEE80211_STYPE_NULLFUNC) !=
4595 IEEE80211_STYPE_QOS_NULLFUNC);
4596 nullfunc->frame_control |=
4597 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
4599 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
4600 skb_put_data(skb, &qoshdr, sizeof(qoshdr));
4603 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4604 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4605 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4609 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4611 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4613 const u8 *ssid, size_t ssid_len,
4616 struct ieee80211_local *local = hw_to_local(hw);
4617 struct ieee80211_hdr_3addr *hdr;
4618 struct sk_buff *skb;
4622 ie_ssid_len = 2 + ssid_len;
4624 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4625 ie_ssid_len + tailroom);
4629 skb_reserve(skb, local->hw.extra_tx_headroom);
4631 hdr = skb_put_zero(skb, sizeof(*hdr));
4632 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4633 IEEE80211_STYPE_PROBE_REQ);
4634 eth_broadcast_addr(hdr->addr1);
4635 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4636 eth_broadcast_addr(hdr->addr3);
4638 pos = skb_put(skb, ie_ssid_len);
4639 *pos++ = WLAN_EID_SSID;
4642 memcpy(pos, ssid, ssid_len);
4647 EXPORT_SYMBOL(ieee80211_probereq_get);
4649 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4650 const void *frame, size_t frame_len,
4651 const struct ieee80211_tx_info *frame_txctl,
4652 struct ieee80211_rts *rts)
4654 const struct ieee80211_hdr *hdr = frame;
4656 rts->frame_control =
4657 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4658 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4660 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4661 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4663 EXPORT_SYMBOL(ieee80211_rts_get);
4665 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4666 const void *frame, size_t frame_len,
4667 const struct ieee80211_tx_info *frame_txctl,
4668 struct ieee80211_cts *cts)
4670 const struct ieee80211_hdr *hdr = frame;
4672 cts->frame_control =
4673 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4674 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4675 frame_len, frame_txctl);
4676 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4678 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4681 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4682 struct ieee80211_vif *vif)
4684 struct ieee80211_local *local = hw_to_local(hw);
4685 struct sk_buff *skb = NULL;
4686 struct ieee80211_tx_data tx;
4687 struct ieee80211_sub_if_data *sdata;
4689 struct ieee80211_tx_info *info;
4690 struct ieee80211_chanctx_conf *chanctx_conf;
4692 sdata = vif_to_sdata(vif);
4695 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4700 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4701 struct beacon_data *beacon =
4702 rcu_dereference(sdata->u.ap.beacon);
4704 if (!beacon || !beacon->head)
4707 ps = &sdata->u.ap.ps;
4708 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4709 ps = &sdata->u.mesh.ps;
4714 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4715 goto out; /* send buffered bc/mc only after DTIM beacon */
4718 skb = skb_dequeue(&ps->bc_buf);
4721 local->total_ps_buffered--;
4723 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4724 struct ieee80211_hdr *hdr =
4725 (struct ieee80211_hdr *) skb->data;
4726 /* more buffered multicast/broadcast frames ==> set
4727 * MoreData flag in IEEE 802.11 header to inform PS
4729 hdr->frame_control |=
4730 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4733 if (sdata->vif.type == NL80211_IFTYPE_AP)
4734 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4735 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4737 ieee80211_free_txskb(hw, skb);
4740 info = IEEE80211_SKB_CB(skb);
4742 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4743 info->band = chanctx_conf->def.chan->band;
4745 if (invoke_tx_handlers(&tx))
4752 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4754 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4756 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4757 struct ieee80211_sub_if_data *sdata = sta->sdata;
4758 struct ieee80211_local *local = sdata->local;
4762 lockdep_assert_held(&local->sta_mtx);
4764 /* only some cases are supported right now */
4765 switch (sdata->vif.type) {
4766 case NL80211_IFTYPE_STATION:
4767 case NL80211_IFTYPE_AP:
4768 case NL80211_IFTYPE_AP_VLAN:
4775 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4778 if (sta->reserved_tid == tid) {
4783 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4784 sdata_err(sdata, "TID reservation already active\n");
4789 ieee80211_stop_vif_queues(sdata->local, sdata,
4790 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4794 /* Tear down BA sessions so we stop aggregating on this TID */
4795 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4796 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4797 __ieee80211_stop_tx_ba_session(sta, tid,
4798 AGG_STOP_LOCAL_REQUEST);
4801 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4802 __ieee80211_flush_queues(local, sdata, queues, false);
4804 sta->reserved_tid = tid;
4806 ieee80211_wake_vif_queues(local, sdata,
4807 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4809 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4810 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4816 EXPORT_SYMBOL(ieee80211_reserve_tid);
4818 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4820 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4821 struct ieee80211_sub_if_data *sdata = sta->sdata;
4823 lockdep_assert_held(&sdata->local->sta_mtx);
4825 /* only some cases are supported right now */
4826 switch (sdata->vif.type) {
4827 case NL80211_IFTYPE_STATION:
4828 case NL80211_IFTYPE_AP:
4829 case NL80211_IFTYPE_AP_VLAN:
4836 if (tid != sta->reserved_tid) {
4837 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4841 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4843 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4845 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4846 struct sk_buff *skb, int tid,
4847 enum nl80211_band band, u32 txdata_flags)
4849 int ac = ieee80211_ac_from_tid(tid);
4851 skb_reset_mac_header(skb);
4852 skb_set_queue_mapping(skb, ac);
4853 skb->priority = tid;
4855 skb->dev = sdata->dev;
4858 * The other path calling ieee80211_xmit is from the tasklet,
4859 * and while we can handle concurrent transmissions locking
4860 * requirements are that we do not come into tx with bhs on.
4863 IEEE80211_SKB_CB(skb)->band = band;
4864 ieee80211_xmit(sdata, NULL, skb, txdata_flags);
4868 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
4869 const u8 *buf, size_t len,
4870 const u8 *dest, __be16 proto, bool unencrypted)
4872 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4873 struct ieee80211_local *local = sdata->local;
4874 struct sk_buff *skb;
4875 struct ethhdr *ehdr;
4878 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
4879 * or Pre-Authentication
4881 if (proto != sdata->control_port_protocol &&
4882 proto != cpu_to_be16(ETH_P_PREAUTH))
4886 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT;
4890 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4891 sizeof(struct ethhdr) + len);
4895 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
4897 skb_put_data(skb, buf, len);
4899 ehdr = skb_push(skb, sizeof(struct ethhdr));
4900 memcpy(ehdr->h_dest, dest, ETH_ALEN);
4901 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
4902 ehdr->h_proto = proto;
4905 skb->protocol = htons(ETH_P_802_3);
4906 skb_reset_network_header(skb);
4907 skb_reset_mac_header(skb);
4910 __ieee80211_subif_start_xmit(skb, skb->dev, flags);