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, 2020 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_any_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)) {
602 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
604 else if (ieee80211_is_group_privacy_action(tx->skb) &&
605 (key = rcu_dereference(tx->sdata->default_multicast_key)))
607 else if (ieee80211_is_mgmt(hdr->frame_control) &&
608 is_multicast_ether_addr(hdr->addr1) &&
609 ieee80211_is_robust_mgmt_frame(tx->skb) &&
610 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
612 else if (is_multicast_ether_addr(hdr->addr1) &&
613 (key = rcu_dereference(tx->sdata->default_multicast_key)))
615 else if (!is_multicast_ether_addr(hdr->addr1) &&
616 (key = rcu_dereference(tx->sdata->default_unicast_key)))
622 bool skip_hw = false;
624 /* TODO: add threshold stuff again */
626 switch (tx->key->conf.cipher) {
627 case WLAN_CIPHER_SUITE_WEP40:
628 case WLAN_CIPHER_SUITE_WEP104:
629 case WLAN_CIPHER_SUITE_TKIP:
630 if (!ieee80211_is_data_present(hdr->frame_control))
633 case WLAN_CIPHER_SUITE_CCMP:
634 case WLAN_CIPHER_SUITE_CCMP_256:
635 case WLAN_CIPHER_SUITE_GCMP:
636 case WLAN_CIPHER_SUITE_GCMP_256:
637 if (!ieee80211_is_data_present(hdr->frame_control) &&
638 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
640 !ieee80211_is_group_privacy_action(tx->skb))
643 skip_hw = (tx->key->conf.flags &
644 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
645 ieee80211_is_mgmt(hdr->frame_control);
647 case WLAN_CIPHER_SUITE_AES_CMAC:
648 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
649 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
650 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
651 if (!ieee80211_is_mgmt(hdr->frame_control))
656 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
657 !ieee80211_is_deauth(hdr->frame_control)) &&
658 tx->skb->protocol != tx->sdata->control_port_protocol)
661 if (!skip_hw && tx->key &&
662 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
663 info->control.hw_key = &tx->key->conf;
664 } else if (!ieee80211_is_mgmt(hdr->frame_control) && tx->sta &&
665 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) {
672 static ieee80211_tx_result debug_noinline
673 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
675 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
676 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
677 struct ieee80211_supported_band *sband;
679 struct ieee80211_tx_rate_control txrc;
680 struct ieee80211_sta_rates *ratetbl = NULL;
683 memset(&txrc, 0, sizeof(txrc));
685 sband = tx->local->hw.wiphy->bands[info->band];
687 len = min_t(u32, tx->skb->len + FCS_LEN,
688 tx->local->hw.wiphy->frag_threshold);
690 /* set up the tx rate control struct we give the RC algo */
691 txrc.hw = &tx->local->hw;
693 txrc.bss_conf = &tx->sdata->vif.bss_conf;
695 txrc.reported_rate.idx = -1;
696 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
698 if (tx->sdata->rc_has_mcs_mask[info->band])
699 txrc.rate_idx_mcs_mask =
700 tx->sdata->rc_rateidx_mcs_mask[info->band];
702 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
703 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
704 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
705 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
707 /* set up RTS protection if desired */
708 if (len > tx->local->hw.wiphy->rts_threshold) {
712 info->control.use_rts = txrc.rts;
713 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
716 * Use short preamble if the BSS can handle it, but not for
717 * management frames unless we know the receiver can handle
718 * that -- the management frame might be to a station that
719 * just wants a probe response.
721 if (tx->sdata->vif.bss_conf.use_short_preamble &&
722 (ieee80211_is_data(hdr->frame_control) ||
723 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
724 txrc.short_preamble = true;
726 info->control.short_preamble = txrc.short_preamble;
728 /* don't ask rate control when rate already injected via radiotap */
729 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
733 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
736 * Lets not bother rate control if we're associated and cannot
737 * talk to the sta. This should not happen.
739 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
740 !rate_usable_index_exists(sband, &tx->sta->sta),
741 "%s: Dropped data frame as no usable bitrate found while "
742 "scanning and associated. Target station: "
743 "%pM on %d GHz band\n",
744 tx->sdata->name, hdr->addr1,
749 * If we're associated with the sta at this point we know we can at
750 * least send the frame at the lowest bit rate.
752 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
754 if (tx->sta && !info->control.skip_table)
755 ratetbl = rcu_dereference(tx->sta->sta.rates);
757 if (unlikely(info->control.rates[0].idx < 0)) {
759 struct ieee80211_tx_rate rate = {
760 .idx = ratetbl->rate[0].idx,
761 .flags = ratetbl->rate[0].flags,
762 .count = ratetbl->rate[0].count
765 if (ratetbl->rate[0].idx < 0)
773 tx->rate = info->control.rates[0];
776 if (txrc.reported_rate.idx < 0) {
777 txrc.reported_rate = tx->rate;
778 if (tx->sta && ieee80211_is_data(hdr->frame_control))
779 tx->sta->tx_stats.last_rate = txrc.reported_rate;
781 tx->sta->tx_stats.last_rate = txrc.reported_rate;
786 if (unlikely(!info->control.rates[0].count))
787 info->control.rates[0].count = 1;
789 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
790 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
791 info->control.rates[0].count = 1;
796 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
798 u16 *seq = &sta->tid_seq[tid];
799 __le16 ret = cpu_to_le16(*seq);
801 /* Increase the sequence number. */
802 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
807 static ieee80211_tx_result debug_noinline
808 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
810 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
811 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
815 * Packet injection may want to control the sequence
816 * number, if we have no matching interface then we
817 * neither assign one ourselves nor ask the driver to.
819 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
822 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
825 if (ieee80211_hdrlen(hdr->frame_control) < 24)
828 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
832 * Anything but QoS data that has a sequence number field
833 * (is long enough) gets a sequence number from the global
834 * counter. QoS data frames with a multicast destination
835 * also use the global counter (802.11-2012 9.3.2.10).
837 if (!ieee80211_is_data_qos(hdr->frame_control) ||
838 is_multicast_ether_addr(hdr->addr1)) {
839 if (tx->flags & IEEE80211_TX_NO_SEQNO)
841 /* driver should assign sequence number */
842 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
843 /* for pure STA mode without beacons, we can do it */
844 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
845 tx->sdata->sequence_number += 0x10;
847 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
852 * This should be true for injected/management frames only, for
853 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
854 * above since they are not QoS-data frames.
859 /* include per-STA, per-TID sequence counter */
860 tid = ieee80211_get_tid(hdr);
861 tx->sta->tx_stats.msdu[tid]++;
863 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
868 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
869 struct sk_buff *skb, int hdrlen,
872 struct ieee80211_local *local = tx->local;
873 struct ieee80211_tx_info *info;
875 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
876 int pos = hdrlen + per_fragm;
877 int rem = skb->len - hdrlen - per_fragm;
879 if (WARN_ON(rem < 0))
882 /* first fragment was already added to queue by caller */
885 int fraglen = per_fragm;
890 tmp = dev_alloc_skb(local->tx_headroom +
892 tx->sdata->encrypt_headroom +
893 IEEE80211_ENCRYPT_TAILROOM);
897 __skb_queue_tail(&tx->skbs, tmp);
900 local->tx_headroom + tx->sdata->encrypt_headroom);
902 /* copy control information */
903 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
905 info = IEEE80211_SKB_CB(tmp);
906 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
907 IEEE80211_TX_CTL_FIRST_FRAGMENT);
910 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
912 skb_copy_queue_mapping(tmp, skb);
913 tmp->priority = skb->priority;
916 /* copy header and data */
917 skb_put_data(tmp, skb->data, hdrlen);
918 skb_put_data(tmp, skb->data + pos, fraglen);
923 /* adjust first fragment's length */
924 skb_trim(skb, hdrlen + per_fragm);
928 static ieee80211_tx_result debug_noinline
929 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
931 struct sk_buff *skb = tx->skb;
932 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
933 struct ieee80211_hdr *hdr = (void *)skb->data;
934 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
938 /* no matter what happens, tx->skb moves to tx->skbs */
939 __skb_queue_tail(&tx->skbs, skb);
942 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
945 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
949 * Warn when submitting a fragmented A-MPDU frame and drop it.
950 * This scenario is handled in ieee80211_tx_prepare but extra
951 * caution taken here as fragmented ampdu may cause Tx stop.
953 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
956 hdrlen = ieee80211_hdrlen(hdr->frame_control);
958 /* internal error, why isn't DONTFRAG set? */
959 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
963 * Now fragment the frame. This will allocate all the fragments and
964 * chain them (using skb as the first fragment) to skb->next.
965 * During transmission, we will remove the successfully transmitted
966 * fragments from this list. When the low-level driver rejects one
967 * of the fragments then we will simply pretend to accept the skb
968 * but store it away as pending.
970 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
973 /* update duration/seq/flags of fragments */
976 skb_queue_walk(&tx->skbs, skb) {
977 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
979 hdr = (void *)skb->data;
980 info = IEEE80211_SKB_CB(skb);
982 if (!skb_queue_is_last(&tx->skbs, skb)) {
983 hdr->frame_control |= morefrags;
985 * No multi-rate retries for fragmented frames, that
986 * would completely throw off the NAV at other STAs.
988 info->control.rates[1].idx = -1;
989 info->control.rates[2].idx = -1;
990 info->control.rates[3].idx = -1;
991 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
992 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
994 hdr->frame_control &= ~morefrags;
996 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
1003 static ieee80211_tx_result debug_noinline
1004 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1006 struct sk_buff *skb;
1012 skb_queue_walk(&tx->skbs, skb) {
1013 ac = skb_get_queue_mapping(skb);
1014 tx->sta->tx_stats.bytes[ac] += skb->len;
1017 tx->sta->tx_stats.packets[ac]++;
1022 static ieee80211_tx_result debug_noinline
1023 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1028 switch (tx->key->conf.cipher) {
1029 case WLAN_CIPHER_SUITE_WEP40:
1030 case WLAN_CIPHER_SUITE_WEP104:
1031 return ieee80211_crypto_wep_encrypt(tx);
1032 case WLAN_CIPHER_SUITE_TKIP:
1033 return ieee80211_crypto_tkip_encrypt(tx);
1034 case WLAN_CIPHER_SUITE_CCMP:
1035 return ieee80211_crypto_ccmp_encrypt(
1036 tx, IEEE80211_CCMP_MIC_LEN);
1037 case WLAN_CIPHER_SUITE_CCMP_256:
1038 return ieee80211_crypto_ccmp_encrypt(
1039 tx, IEEE80211_CCMP_256_MIC_LEN);
1040 case WLAN_CIPHER_SUITE_AES_CMAC:
1041 return ieee80211_crypto_aes_cmac_encrypt(tx);
1042 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1043 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1044 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1045 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1046 return ieee80211_crypto_aes_gmac_encrypt(tx);
1047 case WLAN_CIPHER_SUITE_GCMP:
1048 case WLAN_CIPHER_SUITE_GCMP_256:
1049 return ieee80211_crypto_gcmp_encrypt(tx);
1051 return ieee80211_crypto_hw_encrypt(tx);
1057 static ieee80211_tx_result debug_noinline
1058 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1060 struct sk_buff *skb;
1061 struct ieee80211_hdr *hdr;
1065 skb_queue_walk(&tx->skbs, skb) {
1066 hdr = (void *) skb->data;
1067 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1068 break; /* must not overwrite AID */
1069 if (!skb_queue_is_last(&tx->skbs, skb)) {
1070 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1071 next_len = next->len;
1074 group_addr = is_multicast_ether_addr(hdr->addr1);
1077 ieee80211_duration(tx, skb, group_addr, next_len);
1083 /* actual transmit path */
1085 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1086 struct sk_buff *skb,
1087 struct ieee80211_tx_info *info,
1088 struct tid_ampdu_tx *tid_tx,
1091 bool queued = false;
1092 bool reset_agg_timer = false;
1093 struct sk_buff *purge_skb = NULL;
1095 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1096 info->flags |= IEEE80211_TX_CTL_AMPDU;
1097 reset_agg_timer = true;
1098 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1100 * nothing -- this aggregation session is being started
1101 * but that might still fail with the driver
1103 } else if (!tx->sta->sta.txq[tid]) {
1104 spin_lock(&tx->sta->lock);
1106 * Need to re-check now, because we may get here
1108 * 1) in the window during which the setup is actually
1109 * already done, but not marked yet because not all
1110 * packets are spliced over to the driver pending
1111 * queue yet -- if this happened we acquire the lock
1112 * either before or after the splice happens, but
1113 * need to recheck which of these cases happened.
1115 * 2) during session teardown, if the OPERATIONAL bit
1116 * was cleared due to the teardown but the pointer
1117 * hasn't been assigned NULL yet (or we loaded it
1118 * before it was assigned) -- in this case it may
1119 * now be NULL which means we should just let the
1120 * packet pass through because splicing the frames
1121 * back is already done.
1123 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1126 /* do nothing, let packet pass through */
1127 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1128 info->flags |= IEEE80211_TX_CTL_AMPDU;
1129 reset_agg_timer = true;
1132 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1133 clear_sta_flag(tx->sta, WLAN_STA_SP);
1134 ps_dbg(tx->sta->sdata,
1135 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1136 tx->sta->sta.addr, tx->sta->sta.aid);
1138 info->control.vif = &tx->sdata->vif;
1139 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1140 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1141 __skb_queue_tail(&tid_tx->pending, skb);
1142 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1143 purge_skb = __skb_dequeue(&tid_tx->pending);
1145 spin_unlock(&tx->sta->lock);
1148 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1151 /* reset session timer */
1152 if (reset_agg_timer)
1153 tid_tx->last_tx = jiffies;
1160 * pass %NULL for the station if unknown, a valid pointer if known
1161 * or an ERR_PTR() if the station is known not to exist
1163 static ieee80211_tx_result
1164 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1165 struct ieee80211_tx_data *tx,
1166 struct sta_info *sta, struct sk_buff *skb)
1168 struct ieee80211_local *local = sdata->local;
1169 struct ieee80211_hdr *hdr;
1170 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1173 memset(tx, 0, sizeof(*tx));
1177 __skb_queue_head_init(&tx->skbs);
1180 * If this flag is set to true anywhere, and we get here,
1181 * we are doing the needed processing, so remove the flag
1184 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1186 hdr = (struct ieee80211_hdr *) skb->data;
1192 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1193 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1194 if (!tx->sta && sdata->wdev.use_4addr)
1196 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1197 IEEE80211_TX_CTL_INJECTED) ||
1198 tx->sdata->control_port_protocol == tx->skb->protocol) {
1199 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1201 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1202 tx->sta = sta_info_get(sdata, hdr->addr1);
1205 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1206 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1207 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1208 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1209 struct tid_ampdu_tx *tid_tx;
1211 tid = ieee80211_get_tid(hdr);
1213 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1217 queued = ieee80211_tx_prep_agg(tx, skb, info,
1220 if (unlikely(queued))
1225 if (is_multicast_ether_addr(hdr->addr1)) {
1226 tx->flags &= ~IEEE80211_TX_UNICAST;
1227 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1229 tx->flags |= IEEE80211_TX_UNICAST;
1231 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1232 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1233 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1234 info->flags & IEEE80211_TX_CTL_AMPDU)
1235 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1239 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1240 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1241 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1242 ieee80211_check_fast_xmit(tx->sta);
1245 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1250 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1251 struct ieee80211_vif *vif,
1252 struct sta_info *sta,
1253 struct sk_buff *skb)
1255 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1256 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1257 struct ieee80211_txq *txq = NULL;
1259 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1260 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1263 if (!ieee80211_is_data_present(hdr->frame_control))
1267 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1272 txq = sta->sta.txq[tid];
1280 return to_txq_info(txq);
1283 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1285 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1288 static u32 codel_skb_len_func(const struct sk_buff *skb)
1293 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1295 const struct ieee80211_tx_info *info;
1297 info = (const struct ieee80211_tx_info *)skb->cb;
1298 return info->control.enqueue_time;
1301 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1304 struct ieee80211_local *local;
1305 struct txq_info *txqi;
1307 struct fq_flow *flow;
1310 local = vif_to_sdata(txqi->txq.vif)->local;
1313 if (cvars == &txqi->def_cvars)
1314 flow = &txqi->def_flow;
1316 flow = &fq->flows[cvars - local->cvars];
1318 return fq_flow_dequeue(fq, flow);
1321 static void codel_drop_func(struct sk_buff *skb,
1324 struct ieee80211_local *local;
1325 struct ieee80211_hw *hw;
1326 struct txq_info *txqi;
1329 local = vif_to_sdata(txqi->txq.vif)->local;
1332 ieee80211_free_txskb(hw, skb);
1335 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1337 struct fq_flow *flow)
1339 struct ieee80211_local *local;
1340 struct txq_info *txqi;
1341 struct codel_vars *cvars;
1342 struct codel_params *cparams;
1343 struct codel_stats *cstats;
1345 local = container_of(fq, struct ieee80211_local, fq);
1346 txqi = container_of(tin, struct txq_info, tin);
1347 cstats = &txqi->cstats;
1349 if (txqi->txq.sta) {
1350 struct sta_info *sta = container_of(txqi->txq.sta,
1351 struct sta_info, sta);
1352 cparams = &sta->cparams;
1354 cparams = &local->cparams;
1357 if (flow == &txqi->def_flow)
1358 cvars = &txqi->def_cvars;
1360 cvars = &local->cvars[flow - fq->flows];
1362 return codel_dequeue(txqi,
1368 codel_skb_time_func,
1370 codel_dequeue_func);
1373 static void fq_skb_free_func(struct fq *fq,
1375 struct fq_flow *flow,
1376 struct sk_buff *skb)
1378 struct ieee80211_local *local;
1380 local = container_of(fq, struct ieee80211_local, fq);
1381 ieee80211_free_txskb(&local->hw, skb);
1384 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1387 struct sk_buff *skb)
1389 struct txq_info *txqi;
1391 txqi = container_of(tin, struct txq_info, tin);
1392 return &txqi->def_flow;
1395 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1396 struct txq_info *txqi,
1397 struct sk_buff *skb)
1399 struct fq *fq = &local->fq;
1400 struct fq_tin *tin = &txqi->tin;
1402 ieee80211_set_skb_enqueue_time(skb);
1403 fq_tin_enqueue(fq, tin, skb,
1405 fq_flow_get_default_func);
1408 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1409 struct fq_flow *flow, struct sk_buff *skb,
1412 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1414 return info->control.vif == data;
1417 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1418 struct ieee80211_sub_if_data *sdata)
1420 struct fq *fq = &local->fq;
1421 struct txq_info *txqi;
1423 struct ieee80211_sub_if_data *ap;
1425 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1428 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1433 txqi = to_txq_info(ap->vif.txq);
1436 spin_lock_bh(&fq->lock);
1437 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1439 spin_unlock_bh(&fq->lock);
1442 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1443 struct sta_info *sta,
1444 struct txq_info *txqi, int tid)
1446 fq_tin_init(&txqi->tin);
1447 fq_flow_init(&txqi->def_flow);
1448 codel_vars_init(&txqi->def_cvars);
1449 codel_stats_init(&txqi->cstats);
1450 __skb_queue_head_init(&txqi->frags);
1452 txqi->txq.vif = &sdata->vif;
1455 txqi->txq.sta = &sta->sta;
1456 sta->sta.txq[tid] = &txqi->txq;
1457 txqi->txq.tid = tid;
1458 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1460 sdata->vif.txq = &txqi->txq;
1462 txqi->txq.ac = IEEE80211_AC_BE;
1466 void ieee80211_txq_purge(struct ieee80211_local *local,
1467 struct txq_info *txqi)
1469 struct fq *fq = &local->fq;
1470 struct fq_tin *tin = &txqi->tin;
1472 fq_tin_reset(fq, tin, fq_skb_free_func);
1473 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1476 void ieee80211_txq_set_params(struct ieee80211_local *local)
1478 if (local->hw.wiphy->txq_limit)
1479 local->fq.limit = local->hw.wiphy->txq_limit;
1481 local->hw.wiphy->txq_limit = local->fq.limit;
1483 if (local->hw.wiphy->txq_memory_limit)
1484 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1486 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1488 if (local->hw.wiphy->txq_quantum)
1489 local->fq.quantum = local->hw.wiphy->txq_quantum;
1491 local->hw.wiphy->txq_quantum = local->fq.quantum;
1494 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1496 struct fq *fq = &local->fq;
1499 bool supp_vht = false;
1500 enum nl80211_band band;
1502 if (!local->ops->wake_tx_queue)
1505 ret = fq_init(fq, 4096);
1510 * If the hardware doesn't support VHT, it is safe to limit the maximum
1511 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1513 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1514 struct ieee80211_supported_band *sband;
1516 sband = local->hw.wiphy->bands[band];
1520 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1524 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1526 codel_params_init(&local->cparams);
1527 local->cparams.interval = MS2TIME(100);
1528 local->cparams.target = MS2TIME(20);
1529 local->cparams.ecn = true;
1531 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1533 if (!local->cvars) {
1534 spin_lock_bh(&fq->lock);
1535 fq_reset(fq, fq_skb_free_func);
1536 spin_unlock_bh(&fq->lock);
1540 for (i = 0; i < fq->flows_cnt; i++)
1541 codel_vars_init(&local->cvars[i]);
1543 ieee80211_txq_set_params(local);
1548 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1550 struct fq *fq = &local->fq;
1552 if (!local->ops->wake_tx_queue)
1555 kfree(local->cvars);
1556 local->cvars = NULL;
1558 spin_lock_bh(&fq->lock);
1559 fq_reset(fq, fq_skb_free_func);
1560 spin_unlock_bh(&fq->lock);
1563 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1564 struct ieee80211_sub_if_data *sdata,
1565 struct sta_info *sta,
1566 struct sk_buff *skb)
1568 struct fq *fq = &local->fq;
1569 struct ieee80211_vif *vif;
1570 struct txq_info *txqi;
1572 if (!local->ops->wake_tx_queue ||
1573 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1576 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1577 sdata = container_of(sdata->bss,
1578 struct ieee80211_sub_if_data, u.ap);
1581 txqi = ieee80211_get_txq(local, vif, sta, skb);
1586 spin_lock_bh(&fq->lock);
1587 ieee80211_txq_enqueue(local, txqi, skb);
1588 spin_unlock_bh(&fq->lock);
1590 drv_wake_tx_queue(local, txqi);
1595 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1596 struct ieee80211_vif *vif,
1597 struct ieee80211_sta *sta,
1598 struct sk_buff_head *skbs,
1601 struct ieee80211_tx_control control = {};
1602 struct sk_buff *skb, *tmp;
1603 unsigned long flags;
1605 skb_queue_walk_safe(skbs, skb, tmp) {
1606 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1607 int q = info->hw_queue;
1609 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1610 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1611 __skb_unlink(skb, skbs);
1612 ieee80211_free_txskb(&local->hw, skb);
1617 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1618 if (local->queue_stop_reasons[q] ||
1619 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1620 if (unlikely(info->flags &
1621 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1622 if (local->queue_stop_reasons[q] &
1623 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1625 * Drop off-channel frames if queues
1626 * are stopped for any reason other
1627 * than off-channel operation. Never
1630 spin_unlock_irqrestore(
1631 &local->queue_stop_reason_lock,
1633 ieee80211_purge_tx_queue(&local->hw,
1640 * Since queue is stopped, queue up frames for
1641 * later transmission from the tx-pending
1642 * tasklet when the queue is woken again.
1645 skb_queue_splice_init(skbs,
1646 &local->pending[q]);
1648 skb_queue_splice_tail_init(skbs,
1649 &local->pending[q]);
1651 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1656 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1658 info->control.vif = vif;
1661 __skb_unlink(skb, skbs);
1662 drv_tx(local, &control, skb);
1669 * Returns false if the frame couldn't be transmitted but was queued instead.
1671 static bool __ieee80211_tx(struct ieee80211_local *local,
1672 struct sk_buff_head *skbs, int led_len,
1673 struct sta_info *sta, bool txpending)
1675 struct ieee80211_tx_info *info;
1676 struct ieee80211_sub_if_data *sdata;
1677 struct ieee80211_vif *vif;
1678 struct ieee80211_sta *pubsta;
1679 struct sk_buff *skb;
1683 if (WARN_ON(skb_queue_empty(skbs)))
1686 skb = skb_peek(skbs);
1687 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1688 info = IEEE80211_SKB_CB(skb);
1689 sdata = vif_to_sdata(info->control.vif);
1690 if (sta && !sta->uploaded)
1698 switch (sdata->vif.type) {
1699 case NL80211_IFTYPE_MONITOR:
1700 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1704 sdata = rcu_dereference(local->monitor_sdata);
1708 vif->hw_queue[skb_get_queue_mapping(skb)];
1709 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1710 ieee80211_purge_tx_queue(&local->hw, skbs);
1715 case NL80211_IFTYPE_AP_VLAN:
1716 sdata = container_of(sdata->bss,
1717 struct ieee80211_sub_if_data, u.ap);
1724 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1727 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1729 WARN_ON_ONCE(!skb_queue_empty(skbs));
1735 * Invoke TX handlers, return 0 on success and non-zero if the
1736 * frame was dropped or queued.
1738 * The handlers are split into an early and late part. The latter is everything
1739 * that can be sensitive to reordering, and will be deferred to after packets
1740 * are dequeued from the intermediate queues (when they are enabled).
1742 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1744 ieee80211_tx_result res = TX_DROP;
1746 #define CALL_TXH(txh) \
1749 if (res != TX_CONTINUE) \
1753 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1754 CALL_TXH(ieee80211_tx_h_check_assoc);
1755 CALL_TXH(ieee80211_tx_h_ps_buf);
1756 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1757 CALL_TXH(ieee80211_tx_h_select_key);
1758 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1759 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1762 if (unlikely(res == TX_DROP)) {
1763 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1765 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1767 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1769 } else if (unlikely(res == TX_QUEUED)) {
1770 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1778 * Late handlers can be called while the sta lock is held. Handlers that can
1779 * cause packets to be generated will cause deadlock!
1781 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1783 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1784 ieee80211_tx_result res = TX_CONTINUE;
1786 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1787 __skb_queue_tail(&tx->skbs, tx->skb);
1792 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1793 CALL_TXH(ieee80211_tx_h_sequence);
1794 CALL_TXH(ieee80211_tx_h_fragment);
1795 /* handlers after fragment must be aware of tx info fragmentation! */
1796 CALL_TXH(ieee80211_tx_h_stats);
1797 CALL_TXH(ieee80211_tx_h_encrypt);
1798 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1799 CALL_TXH(ieee80211_tx_h_calculate_duration);
1803 if (unlikely(res == TX_DROP)) {
1804 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1806 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1808 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1810 } else if (unlikely(res == TX_QUEUED)) {
1811 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1818 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1820 int r = invoke_tx_handlers_early(tx);
1824 return invoke_tx_handlers_late(tx);
1827 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1828 struct ieee80211_vif *vif, struct sk_buff *skb,
1829 int band, struct ieee80211_sta **sta)
1831 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1832 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1833 struct ieee80211_tx_data tx;
1834 struct sk_buff *skb2;
1836 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1840 info->control.vif = vif;
1841 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1843 if (invoke_tx_handlers(&tx))
1848 *sta = &tx.sta->sta;
1853 /* this function isn't suitable for fragmented data frames */
1854 skb2 = __skb_dequeue(&tx.skbs);
1855 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1856 ieee80211_free_txskb(hw, skb2);
1857 ieee80211_purge_tx_queue(hw, &tx.skbs);
1863 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1866 * Returns false if the frame couldn't be transmitted but was queued instead.
1868 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1869 struct sta_info *sta, struct sk_buff *skb,
1870 bool txpending, u32 txdata_flags)
1872 struct ieee80211_local *local = sdata->local;
1873 struct ieee80211_tx_data tx;
1874 ieee80211_tx_result res_prepare;
1875 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1879 if (unlikely(skb->len < 10)) {
1884 /* initialises tx */
1886 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1888 tx.flags |= txdata_flags;
1890 if (unlikely(res_prepare == TX_DROP)) {
1891 ieee80211_free_txskb(&local->hw, skb);
1893 } else if (unlikely(res_prepare == TX_QUEUED)) {
1897 /* set up hw_queue value early */
1898 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1899 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1901 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1903 if (invoke_tx_handlers_early(&tx))
1906 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1909 if (!invoke_tx_handlers_late(&tx))
1910 result = __ieee80211_tx(local, &tx.skbs, led_len,
1916 /* device xmit handlers */
1918 enum ieee80211_encrypt {
1924 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1925 struct sk_buff *skb,
1927 enum ieee80211_encrypt encrypt)
1929 struct ieee80211_local *local = sdata->local;
1933 enc_tailroom = encrypt == ENCRYPT_MGMT ||
1934 (encrypt == ENCRYPT_DATA &&
1935 sdata->crypto_tx_tailroom_needed_cnt);
1938 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1939 tail_need -= skb_tailroom(skb);
1940 tail_need = max_t(int, tail_need, 0);
1943 if (skb_cloned(skb) &&
1944 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1945 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
1946 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1947 else if (head_need || tail_need)
1948 I802_DEBUG_INC(local->tx_expand_skb_head);
1952 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1953 wiphy_debug(local->hw.wiphy,
1954 "failed to reallocate TX buffer\n");
1961 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1962 struct sta_info *sta, struct sk_buff *skb,
1965 struct ieee80211_local *local = sdata->local;
1966 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1967 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1969 enum ieee80211_encrypt encrypt;
1971 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)
1972 encrypt = ENCRYPT_NO;
1973 else if (ieee80211_is_mgmt(hdr->frame_control))
1974 encrypt = ENCRYPT_MGMT;
1976 encrypt = ENCRYPT_DATA;
1978 headroom = local->tx_headroom;
1979 if (encrypt != ENCRYPT_NO)
1980 headroom += sdata->encrypt_headroom;
1981 headroom -= skb_headroom(skb);
1982 headroom = max_t(int, 0, headroom);
1984 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) {
1985 ieee80211_free_txskb(&local->hw, skb);
1989 /* reload after potential resize */
1990 hdr = (struct ieee80211_hdr *) skb->data;
1991 info->control.vif = &sdata->vif;
1993 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1994 if (ieee80211_is_data(hdr->frame_control) &&
1995 is_unicast_ether_addr(hdr->addr1)) {
1996 if (mesh_nexthop_resolve(sdata, skb))
1997 return; /* skb queued: don't free */
1999 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2003 ieee80211_set_qos_hdr(sdata, skb);
2004 ieee80211_tx(sdata, sta, skb, false, txdata_flags);
2007 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
2008 struct sk_buff *skb)
2010 struct ieee80211_radiotap_iterator iterator;
2011 struct ieee80211_radiotap_header *rthdr =
2012 (struct ieee80211_radiotap_header *) skb->data;
2013 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2014 struct ieee80211_supported_band *sband =
2015 local->hw.wiphy->bands[info->band];
2016 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2020 bool rate_found = false;
2021 u8 rate_retries = 0;
2023 u8 mcs_known, mcs_flags, mcs_bw;
2025 u8 vht_mcs = 0, vht_nss = 0;
2028 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2029 IEEE80211_TX_CTL_DONTFRAG;
2032 * for every radiotap entry that is present
2033 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2034 * entries present, or -EINVAL on error)
2038 ret = ieee80211_radiotap_iterator_next(&iterator);
2043 /* see if this argument is something we can use */
2044 switch (iterator.this_arg_index) {
2046 * You must take care when dereferencing iterator.this_arg
2047 * for multibyte types... the pointer is not aligned. Use
2048 * get_unaligned((type *)iterator.this_arg) to dereference
2049 * iterator.this_arg for type "type" safely on all arches.
2051 case IEEE80211_RADIOTAP_FLAGS:
2052 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2054 * this indicates that the skb we have been
2055 * handed has the 32-bit FCS CRC at the end...
2056 * we should react to that by snipping it off
2057 * because it will be recomputed and added
2060 if (skb->len < (iterator._max_length + FCS_LEN))
2063 skb_trim(skb, skb->len - FCS_LEN);
2065 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2066 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2067 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2068 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2071 case IEEE80211_RADIOTAP_TX_FLAGS:
2072 txflags = get_unaligned_le16(iterator.this_arg);
2073 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2074 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2077 case IEEE80211_RADIOTAP_RATE:
2078 rate = *iterator.this_arg;
2083 case IEEE80211_RADIOTAP_DATA_RETRIES:
2084 rate_retries = *iterator.this_arg;
2087 case IEEE80211_RADIOTAP_MCS:
2088 mcs_known = iterator.this_arg[0];
2089 mcs_flags = iterator.this_arg[1];
2090 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2094 rate = iterator.this_arg[2];
2095 rate_flags = IEEE80211_TX_RC_MCS;
2097 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2098 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2099 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2101 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2102 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2103 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2104 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2107 case IEEE80211_RADIOTAP_VHT:
2108 vht_known = get_unaligned_le16(iterator.this_arg);
2111 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2112 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2113 (iterator.this_arg[2] &
2114 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2115 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2117 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2118 if (iterator.this_arg[3] == 1)
2120 IEEE80211_TX_RC_40_MHZ_WIDTH;
2121 else if (iterator.this_arg[3] == 4)
2123 IEEE80211_TX_RC_80_MHZ_WIDTH;
2124 else if (iterator.this_arg[3] == 11)
2126 IEEE80211_TX_RC_160_MHZ_WIDTH;
2129 vht_mcs = iterator.this_arg[4] >> 4;
2132 vht_nss = iterator.this_arg[4] & 0xF;
2133 if (!vht_nss || vht_nss > 8)
2138 * Please update the file
2139 * Documentation/networking/mac80211-injection.txt
2140 * when parsing new fields here.
2148 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2152 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2154 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2155 info->control.rates[i].idx = -1;
2156 info->control.rates[i].flags = 0;
2157 info->control.rates[i].count = 0;
2160 if (rate_flags & IEEE80211_TX_RC_MCS) {
2161 info->control.rates[0].idx = rate;
2162 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2163 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2166 for (i = 0; i < sband->n_bitrates; i++) {
2167 if (rate * 5 != sband->bitrates[i].bitrate)
2170 info->control.rates[0].idx = i;
2175 if (info->control.rates[0].idx < 0)
2176 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2178 info->control.rates[0].flags = rate_flags;
2179 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2180 local->hw.max_rate_tries);
2184 * remove the radiotap header
2185 * iterator->_max_length was sanity-checked against
2186 * skb->len by iterator init
2188 skb_pull(skb, iterator._max_length);
2193 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2194 struct net_device *dev)
2196 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2197 struct ieee80211_chanctx_conf *chanctx_conf;
2198 struct ieee80211_radiotap_header *prthdr =
2199 (struct ieee80211_radiotap_header *)skb->data;
2200 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2201 struct ieee80211_hdr *hdr;
2202 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2203 struct cfg80211_chan_def *chandef;
2207 /* check for not even having the fixed radiotap header part */
2208 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2209 goto fail; /* too short to be possibly valid */
2211 /* is it a header version we can trust to find length from? */
2212 if (unlikely(prthdr->it_version))
2213 goto fail; /* only version 0 is supported */
2215 /* then there must be a radiotap header with a length we can use */
2216 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2218 /* does the skb contain enough to deliver on the alleged length? */
2219 if (unlikely(skb->len < len_rthdr))
2220 goto fail; /* skb too short for claimed rt header extent */
2223 * fix up the pointers accounting for the radiotap
2224 * header still being in there. We are being given
2225 * a precooked IEEE80211 header so no need for
2228 skb_set_mac_header(skb, len_rthdr);
2230 * these are just fixed to the end of the rt area since we
2231 * don't have any better information and at this point, nobody cares
2233 skb_set_network_header(skb, len_rthdr);
2234 skb_set_transport_header(skb, len_rthdr);
2236 if (skb->len < len_rthdr + 2)
2239 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2240 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2242 if (skb->len < len_rthdr + hdrlen)
2246 * Initialize skb->protocol if the injected frame is a data frame
2247 * carrying a rfc1042 header
2249 if (ieee80211_is_data(hdr->frame_control) &&
2250 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2251 u8 *payload = (u8 *)hdr + hdrlen;
2253 if (ether_addr_equal(payload, rfc1042_header))
2254 skb->protocol = cpu_to_be16((payload[6] << 8) |
2258 memset(info, 0, sizeof(*info));
2260 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2261 IEEE80211_TX_CTL_INJECTED;
2266 * We process outgoing injected frames that have a local address
2267 * we handle as though they are non-injected frames.
2268 * This code here isn't entirely correct, the local MAC address
2269 * isn't always enough to find the interface to use; for proper
2270 * VLAN/WDS support we will need a different mechanism (which
2271 * likely isn't going to be monitor interfaces).
2273 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2275 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2276 if (!ieee80211_sdata_running(tmp_sdata))
2278 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2279 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2280 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2282 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2288 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2289 if (!chanctx_conf) {
2290 tmp_sdata = rcu_dereference(local->monitor_sdata);
2293 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2297 chandef = &chanctx_conf->def;
2298 else if (!local->use_chanctx)
2299 chandef = &local->_oper_chandef;
2304 * Frame injection is not allowed if beaconing is not allowed
2305 * or if we need radar detection. Beaconing is usually not allowed when
2306 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2307 * Passive scan is also used in world regulatory domains where
2308 * your country is not known and as such it should be treated as
2309 * NO TX unless the channel is explicitly allowed in which case
2310 * your current regulatory domain would not have the passive scan
2313 * Since AP mode uses monitor interfaces to inject/TX management
2314 * frames we can make AP mode the exception to this rule once it
2315 * supports radar detection as its implementation can deal with
2316 * radar detection by itself. We can do that later by adding a
2317 * monitor flag interfaces used for AP support.
2319 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2323 info->band = chandef->chan->band;
2325 /* process and remove the injection radiotap header */
2326 if (!ieee80211_parse_tx_radiotap(local, skb))
2329 ieee80211_xmit(sdata, NULL, skb, 0);
2332 return NETDEV_TX_OK;
2338 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2341 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2343 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2345 return ethertype == ETH_P_TDLS &&
2347 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2350 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2351 struct sk_buff *skb,
2352 struct sta_info **sta_out)
2354 struct sta_info *sta;
2356 switch (sdata->vif.type) {
2357 case NL80211_IFTYPE_AP_VLAN:
2358 sta = rcu_dereference(sdata->u.vlan.sta);
2362 } else if (sdata->wdev.use_4addr) {
2366 case NL80211_IFTYPE_AP:
2367 case NL80211_IFTYPE_OCB:
2368 case NL80211_IFTYPE_ADHOC:
2369 if (is_multicast_ether_addr(skb->data)) {
2370 *sta_out = ERR_PTR(-ENOENT);
2373 sta = sta_info_get_bss(sdata, skb->data);
2375 case NL80211_IFTYPE_WDS:
2376 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2378 #ifdef CONFIG_MAC80211_MESH
2379 case NL80211_IFTYPE_MESH_POINT:
2380 /* determined much later */
2384 case NL80211_IFTYPE_STATION:
2385 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2386 sta = sta_info_get(sdata, skb->data);
2387 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2388 if (test_sta_flag(sta,
2389 WLAN_STA_TDLS_PEER_AUTH)) {
2395 * TDLS link during setup - throw out frames to
2396 * peer. Allow TDLS-setup frames to unauthorized
2397 * peers for the special case of a link teardown
2398 * after a TDLS sta is removed due to being
2401 if (!ieee80211_is_tdls_setup(skb))
2407 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2415 *sta_out = sta ?: ERR_PTR(-ENOENT);
2420 * ieee80211_build_hdr - build 802.11 header in the given frame
2421 * @sdata: virtual interface to build the header for
2422 * @skb: the skb to build the header in
2423 * @info_flags: skb flags to set
2424 * @ctrl_flags: info control flags to set
2426 * This function takes the skb with 802.3 header and reformats the header to
2427 * the appropriate IEEE 802.11 header based on which interface the packet is
2428 * being transmitted on.
2430 * Note that this function also takes care of the TX status request and
2431 * potential unsharing of the SKB - this needs to be interleaved with the
2434 * The function requires the read-side RCU lock held
2436 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2438 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2439 struct sk_buff *skb, u32 info_flags,
2440 struct sta_info *sta, u32 ctrl_flags)
2442 struct ieee80211_local *local = sdata->local;
2443 struct ieee80211_tx_info *info;
2445 u16 ethertype, hdrlen, meshhdrlen = 0;
2447 struct ieee80211_hdr hdr;
2448 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2449 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2450 const u8 *encaps_data;
2451 int encaps_len, skip_header_bytes;
2452 bool wme_sta = false, authorized = false;
2456 struct ieee80211_chanctx_conf *chanctx_conf;
2457 struct ieee80211_sub_if_data *ap_sdata;
2458 enum nl80211_band band;
2464 /* convert Ethernet header to proper 802.11 header (based on
2465 * operation mode) */
2466 ethertype = (skb->data[12] << 8) | skb->data[13];
2467 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2469 switch (sdata->vif.type) {
2470 case NL80211_IFTYPE_AP_VLAN:
2471 if (sdata->wdev.use_4addr) {
2472 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2474 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2475 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2476 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2477 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2479 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2480 wme_sta = sta->sta.wme;
2482 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2484 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2485 if (!chanctx_conf) {
2489 band = chanctx_conf->def.chan->band;
2490 if (sdata->wdev.use_4addr)
2493 case NL80211_IFTYPE_AP:
2494 if (sdata->vif.type == NL80211_IFTYPE_AP)
2495 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2496 if (!chanctx_conf) {
2500 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2502 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2503 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2504 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2506 band = chanctx_conf->def.chan->band;
2508 case NL80211_IFTYPE_WDS:
2509 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2511 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2512 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2513 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2514 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2517 * This is the exception! WDS style interfaces are prohibited
2518 * when channel contexts are in used so this must be valid
2520 band = local->hw.conf.chandef.chan->band;
2522 #ifdef CONFIG_MAC80211_MESH
2523 case NL80211_IFTYPE_MESH_POINT:
2524 if (!is_multicast_ether_addr(skb->data)) {
2525 struct sta_info *next_hop;
2526 bool mpp_lookup = true;
2528 mpath = mesh_path_lookup(sdata, skb->data);
2531 next_hop = rcu_dereference(mpath->next_hop);
2533 !(mpath->flags & (MESH_PATH_ACTIVE |
2534 MESH_PATH_RESOLVING)))
2539 mppath = mpp_path_lookup(sdata, skb->data);
2541 mppath->exp_time = jiffies;
2544 if (mppath && mpath)
2545 mesh_path_del(sdata, mpath->dst);
2549 * Use address extension if it is a packet from
2550 * another interface or if we know the destination
2551 * is being proxied by a portal (i.e. portal address
2552 * differs from proxied address)
2554 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2555 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2556 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2557 skb->data, skb->data + ETH_ALEN);
2558 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2561 /* DS -> MBSS (802.11-2012 13.11.3.3).
2562 * For unicast with unknown forwarding information,
2563 * destination might be in the MBSS or if that fails
2564 * forwarded to another mesh gate. In either case
2565 * resolution will be handled in ieee80211_xmit(), so
2566 * leave the original DA. This also works for mcast */
2567 const u8 *mesh_da = skb->data;
2570 mesh_da = mppath->mpp;
2572 mesh_da = mpath->dst;
2574 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2575 mesh_da, sdata->vif.addr);
2576 if (is_multicast_ether_addr(mesh_da))
2577 /* DA TA mSA AE:SA */
2578 meshhdrlen = ieee80211_new_mesh_header(
2580 skb->data + ETH_ALEN, NULL);
2582 /* RA TA mDA mSA AE:DA SA */
2583 meshhdrlen = ieee80211_new_mesh_header(
2584 sdata, &mesh_hdr, skb->data,
2585 skb->data + ETH_ALEN);
2588 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2589 if (!chanctx_conf) {
2593 band = chanctx_conf->def.chan->band;
2596 case NL80211_IFTYPE_STATION:
2597 /* we already did checks when looking up the RA STA */
2598 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2602 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2603 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2604 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2606 } else if (sdata->u.mgd.use_4addr &&
2607 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2608 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2609 IEEE80211_FCTL_TODS);
2611 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2612 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2613 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2614 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2617 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2619 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2620 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2621 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2624 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2625 if (!chanctx_conf) {
2629 band = chanctx_conf->def.chan->band;
2631 case NL80211_IFTYPE_OCB:
2633 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2634 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2635 eth_broadcast_addr(hdr.addr3);
2637 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2638 if (!chanctx_conf) {
2642 band = chanctx_conf->def.chan->band;
2644 case NL80211_IFTYPE_ADHOC:
2646 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2647 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2648 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2650 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2651 if (!chanctx_conf) {
2655 band = chanctx_conf->def.chan->band;
2662 multicast = is_multicast_ether_addr(hdr.addr1);
2664 /* sta is always NULL for mesh */
2666 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2667 wme_sta = sta->sta.wme;
2668 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2669 /* For mesh, the use of the QoS header is mandatory */
2673 /* receiver does QoS (which also means we do) use it */
2675 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2680 * Drop unicast frames to unauthorised stations unless they are
2681 * EAPOL frames from the local station.
2683 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2684 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2685 !multicast && !authorized &&
2686 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2687 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2688 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2689 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2690 sdata->name, hdr.addr1);
2693 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2699 if (unlikely(!multicast && skb->sk &&
2700 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2701 struct sk_buff *ack_skb = skb_clone_sk(skb);
2704 unsigned long flags;
2707 spin_lock_irqsave(&local->ack_status_lock, flags);
2708 id = idr_alloc(&local->ack_status_frames, ack_skb,
2709 1, 0x10000, GFP_ATOMIC);
2710 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2714 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2722 * If the skb is shared we need to obtain our own copy.
2724 if (skb_shared(skb)) {
2725 struct sk_buff *tmp_skb = skb;
2727 /* can't happen -- skb is a clone if info_id != 0 */
2730 skb = skb_clone(skb, GFP_ATOMIC);
2739 hdr.frame_control = fc;
2740 hdr.duration_id = 0;
2743 skip_header_bytes = ETH_HLEN;
2744 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2745 encaps_data = bridge_tunnel_header;
2746 encaps_len = sizeof(bridge_tunnel_header);
2747 skip_header_bytes -= 2;
2748 } else if (ethertype >= ETH_P_802_3_MIN) {
2749 encaps_data = rfc1042_header;
2750 encaps_len = sizeof(rfc1042_header);
2751 skip_header_bytes -= 2;
2757 skb_pull(skb, skip_header_bytes);
2758 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2761 * So we need to modify the skb header and hence need a copy of
2762 * that. The head_need variable above doesn't, so far, include
2763 * the needed header space that we don't need right away. If we
2764 * can, then we don't reallocate right now but only after the
2765 * frame arrives at the master device (if it does...)
2767 * If we cannot, however, then we will reallocate to include all
2768 * the ever needed space. Also, if we need to reallocate it anyway,
2769 * make it big enough for everything we may ever need.
2772 if (head_need > 0 || skb_cloned(skb)) {
2773 head_need += sdata->encrypt_headroom;
2774 head_need += local->tx_headroom;
2775 head_need = max_t(int, 0, head_need);
2776 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) {
2777 ieee80211_free_txskb(&local->hw, skb);
2779 return ERR_PTR(-ENOMEM);
2784 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2786 #ifdef CONFIG_MAC80211_MESH
2788 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2791 if (ieee80211_is_data_qos(fc)) {
2792 __le16 *qos_control;
2794 qos_control = skb_push(skb, 2);
2795 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2797 * Maybe we could actually set some fields here, for now just
2798 * initialise to zero to indicate no special operation.
2802 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2804 skb_reset_mac_header(skb);
2806 info = IEEE80211_SKB_CB(skb);
2807 memset(info, 0, sizeof(*info));
2809 info->flags = info_flags;
2810 info->ack_frame_id = info_id;
2812 info->control.flags = ctrl_flags;
2817 return ERR_PTR(ret);
2821 * fast-xmit overview
2823 * The core idea of this fast-xmit is to remove per-packet checks by checking
2824 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2825 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2826 * much less work can be done per packet. For example, fragmentation must be
2827 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2830 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2831 * header and other data to aid packet processing in ieee80211_xmit_fast().
2833 * The most difficult part of this is that when any of these assumptions
2834 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2835 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2836 * since the per-packet code no longer checks the conditions. This is reflected
2837 * by the calls to these functions throughout the rest of the code, and must be
2838 * maintained if any of the TX path checks change.
2841 void ieee80211_check_fast_xmit(struct sta_info *sta)
2843 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2844 struct ieee80211_local *local = sta->local;
2845 struct ieee80211_sub_if_data *sdata = sta->sdata;
2846 struct ieee80211_hdr *hdr = (void *)build.hdr;
2847 struct ieee80211_chanctx_conf *chanctx_conf;
2850 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2853 /* Locking here protects both the pointer itself, and against concurrent
2854 * invocations winning data access races to, e.g., the key pointer that
2856 * Without it, the invocation of this function right after the key
2857 * pointer changes wouldn't be sufficient, as another CPU could access
2858 * the pointer, then stall, and then do the cache update after the CPU
2859 * that invalidated the key.
2860 * With the locking, such scenarios cannot happen as the check for the
2861 * key and the fast-tx assignment are done atomically, so the CPU that
2862 * modifies the key will either wait or other one will see the key
2863 * cleared/changed already.
2865 spin_lock_bh(&sta->lock);
2866 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2867 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2868 sdata->vif.type == NL80211_IFTYPE_STATION)
2871 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded)
2874 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2875 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2876 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2877 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2880 if (sdata->noack_map)
2883 /* fast-xmit doesn't handle fragmentation at all */
2884 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2885 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2889 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2890 if (!chanctx_conf) {
2894 build.band = chanctx_conf->def.chan->band;
2897 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2899 switch (sdata->vif.type) {
2900 case NL80211_IFTYPE_ADHOC:
2902 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2903 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2904 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2907 case NL80211_IFTYPE_STATION:
2908 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2910 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2911 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2912 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2917 if (sdata->u.mgd.use_4addr) {
2918 /* non-regular ethertype cannot use the fastpath */
2919 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2920 IEEE80211_FCTL_TODS);
2922 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2923 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2924 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2925 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2929 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2931 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2932 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2933 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2936 case NL80211_IFTYPE_AP_VLAN:
2937 if (sdata->wdev.use_4addr) {
2938 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2939 IEEE80211_FCTL_TODS);
2941 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2942 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2943 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2944 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2949 case NL80211_IFTYPE_AP:
2950 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2952 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2953 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2954 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2958 /* not handled on fast-xmit */
2964 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2967 /* We store the key here so there's no point in using rcu_dereference()
2968 * but that's fine because the code that changes the pointers will call
2969 * this function after doing so. For a single CPU that would be enough,
2970 * for multiple see the comment above.
2972 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2974 build.key = rcu_access_pointer(sdata->default_unicast_key);
2976 bool gen_iv, iv_spc, mmic;
2978 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2979 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2980 mmic = build.key->conf.flags &
2981 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
2982 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
2984 /* don't handle software crypto */
2985 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2988 switch (build.key->conf.cipher) {
2989 case WLAN_CIPHER_SUITE_CCMP:
2990 case WLAN_CIPHER_SUITE_CCMP_256:
2991 /* add fixed key ID */
2993 (build.hdr + build.hdr_len)[3] =
2994 0x20 | (build.key->conf.keyidx << 6);
2995 build.pn_offs = build.hdr_len;
2997 if (gen_iv || iv_spc)
2998 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
3000 case WLAN_CIPHER_SUITE_GCMP:
3001 case WLAN_CIPHER_SUITE_GCMP_256:
3002 /* add fixed key ID */
3004 (build.hdr + build.hdr_len)[3] =
3005 0x20 | (build.key->conf.keyidx << 6);
3006 build.pn_offs = build.hdr_len;
3008 if (gen_iv || iv_spc)
3009 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3011 case WLAN_CIPHER_SUITE_TKIP:
3012 /* cannot handle MMIC or IV generation in xmit-fast */
3016 build.hdr_len += IEEE80211_TKIP_IV_LEN;
3018 case WLAN_CIPHER_SUITE_WEP40:
3019 case WLAN_CIPHER_SUITE_WEP104:
3020 /* cannot handle IV generation in fast-xmit */
3024 build.hdr_len += IEEE80211_WEP_IV_LEN;
3026 case WLAN_CIPHER_SUITE_AES_CMAC:
3027 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3028 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3029 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3031 "management cipher suite 0x%x enabled for data\n",
3032 build.key->conf.cipher);
3035 /* we don't know how to generate IVs for this at all */
3036 if (WARN_ON(gen_iv))
3038 /* pure hardware keys are OK, of course */
3039 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
3041 /* cipher scheme might require space allocation */
3043 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
3046 build.hdr_len += build.key->conf.iv_len;
3049 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3052 hdr->frame_control = fc;
3054 memcpy(build.hdr + build.hdr_len,
3055 rfc1042_header, sizeof(rfc1042_header));
3056 build.hdr_len += sizeof(rfc1042_header);
3058 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3059 /* if the kmemdup fails, continue w/o fast_tx */
3064 /* we might have raced against another call to this function */
3065 old = rcu_dereference_protected(sta->fast_tx,
3066 lockdep_is_held(&sta->lock));
3067 rcu_assign_pointer(sta->fast_tx, fast_tx);
3069 kfree_rcu(old, rcu_head);
3070 spin_unlock_bh(&sta->lock);
3073 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3075 struct sta_info *sta;
3078 list_for_each_entry_rcu(sta, &local->sta_list, list)
3079 ieee80211_check_fast_xmit(sta);
3083 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3085 struct ieee80211_local *local = sdata->local;
3086 struct sta_info *sta;
3090 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3091 if (sdata != sta->sdata &&
3092 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3094 ieee80211_check_fast_xmit(sta);
3100 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3102 struct ieee80211_fast_tx *fast_tx;
3104 spin_lock_bh(&sta->lock);
3105 fast_tx = rcu_dereference_protected(sta->fast_tx,
3106 lockdep_is_held(&sta->lock));
3107 RCU_INIT_POINTER(sta->fast_tx, NULL);
3108 spin_unlock_bh(&sta->lock);
3111 kfree_rcu(fast_tx, rcu_head);
3114 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3115 struct sk_buff *skb, int headroom)
3117 if (skb_headroom(skb) < headroom) {
3118 I802_DEBUG_INC(local->tx_expand_skb_head);
3120 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3121 wiphy_debug(local->hw.wiphy,
3122 "failed to reallocate TX buffer\n");
3130 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3131 struct ieee80211_fast_tx *fast_tx,
3132 struct sk_buff *skb)
3134 struct ieee80211_local *local = sdata->local;
3135 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3136 struct ieee80211_hdr *hdr;
3137 struct ethhdr *amsdu_hdr;
3138 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3139 int subframe_len = skb->len - hdr_len;
3141 u8 *qc, *h_80211_src, *h_80211_dst;
3144 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3147 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3150 if (!ieee80211_amsdu_realloc_pad(local, skb,
3151 sizeof(*amsdu_hdr) +
3152 local->hw.extra_tx_headroom))
3155 data = skb_push(skb, sizeof(*amsdu_hdr));
3156 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3158 amsdu_hdr = data + hdr_len;
3159 /* h_80211_src/dst is addr* field within hdr */
3160 h_80211_src = data + fast_tx->sa_offs;
3161 h_80211_dst = data + fast_tx->da_offs;
3163 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3164 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3165 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3167 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3168 * fields needs to be changed to BSSID for A-MSDU frames depending
3169 * on FromDS/ToDS values.
3171 switch (sdata->vif.type) {
3172 case NL80211_IFTYPE_STATION:
3173 bssid = sdata->u.mgd.bssid;
3175 case NL80211_IFTYPE_AP:
3176 case NL80211_IFTYPE_AP_VLAN:
3177 bssid = sdata->vif.addr;
3183 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3184 ether_addr_copy(h_80211_src, bssid);
3186 if (bssid && ieee80211_has_tods(hdr->frame_control))
3187 ether_addr_copy(h_80211_dst, bssid);
3189 qc = ieee80211_get_qos_ctl(hdr);
3190 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3192 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3197 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3198 struct sta_info *sta,
3199 struct ieee80211_fast_tx *fast_tx,
3200 struct sk_buff *skb)
3202 struct ieee80211_local *local = sdata->local;
3203 struct fq *fq = &local->fq;
3205 struct fq_flow *flow;
3206 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3207 struct ieee80211_txq *txq = sta->sta.txq[tid];
3208 struct txq_info *txqi;
3209 struct sk_buff **frag_tail, *head;
3210 int subframe_len = skb->len - ETH_ALEN;
3211 u8 max_subframes = sta->sta.max_amsdu_subframes;
3212 int max_frags = local->hw.max_tx_fragments;
3213 int max_amsdu_len = sta->sta.max_amsdu_len;
3218 unsigned int orig_len;
3219 int n = 2, nfrags, pad = 0;
3222 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3228 txqi = to_txq_info(txq);
3229 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3232 if (sta->sta.max_rc_amsdu_len)
3233 max_amsdu_len = min_t(int, max_amsdu_len,
3234 sta->sta.max_rc_amsdu_len);
3236 spin_lock_bh(&fq->lock);
3238 /* TODO: Ideally aggregation should be done on dequeue to remain
3239 * responsive to environment changes.
3243 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3244 head = skb_peek_tail(&flow->queue);
3248 orig_truesize = head->truesize;
3249 orig_len = head->len;
3251 if (skb->len + head->len > max_amsdu_len)
3254 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3255 nfrags += 1 + skb_shinfo(head)->nr_frags;
3256 frag_tail = &skb_shinfo(head)->frag_list;
3257 while (*frag_tail) {
3258 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3259 frag_tail = &(*frag_tail)->next;
3263 if (max_subframes && n > max_subframes)
3266 if (max_frags && nfrags > max_frags)
3269 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3272 /* If n == 2, the "while (*frag_tail)" loop above didn't execute
3273 * and frag_tail should be &skb_shinfo(head)->frag_list.
3274 * However, ieee80211_amsdu_prepare_head() can reallocate it.
3275 * Reload frag_tail to have it pointing to the correct place.
3278 frag_tail = &skb_shinfo(head)->frag_list;
3281 * Pad out the previous subframe to a multiple of 4 by adding the
3282 * padding to the next one, that's being added. Note that head->len
3283 * is the length of the full A-MSDU, but that works since each time
3284 * we add a new subframe we pad out the previous one to a multiple
3285 * of 4 and thus it no longer matters in the next round.
3287 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3288 if ((head->len - hdrlen) & 3)
3289 pad = 4 - ((head->len - hdrlen) & 3);
3291 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3296 data = skb_push(skb, ETH_ALEN + 2);
3297 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3299 data += 2 * ETH_ALEN;
3300 len = cpu_to_be16(subframe_len);
3301 memcpy(data, &len, 2);
3302 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3304 memset(skb_push(skb, pad), 0, pad);
3306 head->len += skb->len;
3307 head->data_len += skb->len;
3311 fq->memory_usage += head->truesize - orig_truesize;
3312 if (head->len != orig_len) {
3313 flow->backlog += head->len - orig_len;
3314 tin->backlog_bytes += head->len - orig_len;
3316 fq_recalc_backlog(fq, tin, flow);
3319 spin_unlock_bh(&fq->lock);
3325 * Can be called while the sta lock is held. Anything that can cause packets to
3326 * be generated will cause deadlock!
3328 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3329 struct sta_info *sta, u8 pn_offs,
3330 struct ieee80211_key *key,
3331 struct sk_buff *skb)
3333 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3334 struct ieee80211_hdr *hdr = (void *)skb->data;
3335 u8 tid = IEEE80211_NUM_TIDS;
3338 info->control.hw_key = &key->conf;
3340 ieee80211_tx_stats(skb->dev, skb->len);
3342 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3343 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3344 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3346 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3347 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3348 sdata->sequence_number += 0x10;
3351 if (skb_shinfo(skb)->gso_size)
3352 sta->tx_stats.msdu[tid] +=
3353 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3355 sta->tx_stats.msdu[tid]++;
3357 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3359 /* statistics normally done by ieee80211_tx_h_stats (but that
3360 * has to consider fragmentation, so is more complex)
3362 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3363 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3367 u8 *crypto_hdr = skb->data + pn_offs;
3369 switch (key->conf.cipher) {
3370 case WLAN_CIPHER_SUITE_CCMP:
3371 case WLAN_CIPHER_SUITE_CCMP_256:
3372 case WLAN_CIPHER_SUITE_GCMP:
3373 case WLAN_CIPHER_SUITE_GCMP_256:
3374 pn = atomic64_inc_return(&key->conf.tx_pn);
3376 crypto_hdr[1] = pn >> 8;
3377 crypto_hdr[4] = pn >> 16;
3378 crypto_hdr[5] = pn >> 24;
3379 crypto_hdr[6] = pn >> 32;
3380 crypto_hdr[7] = pn >> 40;
3386 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3387 struct sta_info *sta,
3388 struct ieee80211_fast_tx *fast_tx,
3389 struct sk_buff *skb)
3391 struct ieee80211_local *local = sdata->local;
3392 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3393 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3394 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3396 struct ieee80211_tx_info *info;
3397 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3398 struct ieee80211_tx_data tx;
3399 ieee80211_tx_result r;
3400 struct tid_ampdu_tx *tid_tx = NULL;
3401 u8 tid = IEEE80211_NUM_TIDS;
3403 /* control port protocol needs a lot of special handling */
3404 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3407 /* only RFC 1042 SNAP */
3408 if (ethertype < ETH_P_802_3_MIN)
3411 /* don't handle TX status request here either */
3412 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3415 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3416 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3417 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3419 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3421 if (tid_tx->timeout)
3422 tid_tx->last_tx = jiffies;
3426 /* after this point (skb is modified) we cannot return false */
3428 if (skb_shared(skb)) {
3429 struct sk_buff *tmp_skb = skb;
3431 skb = skb_clone(skb, GFP_ATOMIC);
3438 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3439 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3442 /* will not be crypto-handled beyond what we do here, so use false
3443 * as the may-encrypt argument for the resize to not account for
3444 * more room than we already have in 'extra_head'
3446 if (unlikely(ieee80211_skb_resize(sdata, skb,
3447 max_t(int, extra_head + hw_headroom -
3448 skb_headroom(skb), 0),
3454 memcpy(ð, skb->data, ETH_HLEN - 2);
3455 hdr = skb_push(skb, extra_head);
3456 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3457 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3458 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3460 info = IEEE80211_SKB_CB(skb);
3461 memset(info, 0, sizeof(*info));
3462 info->band = fast_tx->band;
3463 info->control.vif = &sdata->vif;
3464 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3465 IEEE80211_TX_CTL_DONTFRAG |
3466 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3467 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3469 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3470 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3471 *ieee80211_get_qos_ctl(hdr) = tid;
3474 __skb_queue_head_init(&tx.skbs);
3476 tx.flags = IEEE80211_TX_UNICAST;
3480 tx.key = fast_tx->key;
3482 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3484 r = ieee80211_tx_h_rate_ctrl(&tx);
3488 if (r != TX_CONTINUE) {
3495 if (ieee80211_queue_skb(local, sdata, sta, skb))
3498 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3501 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3502 sdata = container_of(sdata->bss,
3503 struct ieee80211_sub_if_data, u.ap);
3505 __skb_queue_tail(&tx.skbs, skb);
3506 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3510 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3511 struct ieee80211_txq *txq)
3513 struct ieee80211_local *local = hw_to_local(hw);
3514 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3515 struct ieee80211_hdr *hdr;
3516 struct sk_buff *skb = NULL;
3517 struct fq *fq = &local->fq;
3518 struct fq_tin *tin = &txqi->tin;
3519 struct ieee80211_tx_info *info;
3520 struct ieee80211_tx_data tx;
3521 ieee80211_tx_result r;
3522 struct ieee80211_vif *vif;
3524 spin_lock_bh(&fq->lock);
3526 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3529 /* Make sure fragments stay together. */
3530 skb = __skb_dequeue(&txqi->frags);
3535 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3539 hdr = (struct ieee80211_hdr *)skb->data;
3540 info = IEEE80211_SKB_CB(skb);
3542 memset(&tx, 0, sizeof(tx));
3543 __skb_queue_head_init(&tx.skbs);
3546 tx.sdata = vif_to_sdata(info->control.vif);
3549 tx.sta = container_of(txq->sta, struct sta_info, sta);
3551 * Drop unicast frames to unauthorised stations unless they are
3552 * EAPOL frames from the local station.
3554 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
3555 !ieee80211_vif_is_mesh(&tx.sdata->vif) &&
3556 tx.sdata->vif.type != NL80211_IFTYPE_OCB &&
3557 !is_multicast_ether_addr(hdr->addr1) &&
3558 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) &&
3559 (!(info->control.flags &
3560 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) ||
3561 !ether_addr_equal(tx.sdata->vif.addr,
3563 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
3564 ieee80211_free_txskb(&local->hw, skb);
3570 * The key can be removed while the packet was queued, so need to call
3571 * this here to get the current key.
3573 r = ieee80211_tx_h_select_key(&tx);
3574 if (r != TX_CONTINUE) {
3575 ieee80211_free_txskb(&local->hw, skb);
3579 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3580 info->flags |= IEEE80211_TX_CTL_AMPDU;
3582 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3584 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3585 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3590 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3591 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3593 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3596 if (invoke_tx_handlers_late(&tx))
3599 skb = __skb_dequeue(&tx.skbs);
3601 if (!skb_queue_empty(&tx.skbs))
3602 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3605 if (skb && skb_has_frag_list(skb) &&
3606 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3607 if (skb_linearize(skb)) {
3608 ieee80211_free_txskb(&local->hw, skb);
3613 switch (tx.sdata->vif.type) {
3614 case NL80211_IFTYPE_MONITOR:
3615 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3616 vif = &tx.sdata->vif;
3619 tx.sdata = rcu_dereference(local->monitor_sdata);
3621 vif = &tx.sdata->vif;
3623 vif->hw_queue[skb_get_queue_mapping(skb)];
3624 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3625 ieee80211_free_txskb(&local->hw, skb);
3631 case NL80211_IFTYPE_AP_VLAN:
3632 tx.sdata = container_of(tx.sdata->bss,
3633 struct ieee80211_sub_if_data, u.ap);
3636 vif = &tx.sdata->vif;
3640 IEEE80211_SKB_CB(skb)->control.vif = vif;
3642 spin_unlock_bh(&fq->lock);
3646 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3648 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3649 struct net_device *dev,
3653 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3654 struct sta_info *sta;
3655 struct sk_buff *next;
3657 if (unlikely(skb->len < ETH_HLEN)) {
3664 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3667 if (!IS_ERR_OR_NULL(sta)) {
3668 struct ieee80211_fast_tx *fast_tx;
3670 /* We need a bit of data queued to build aggregates properly, so
3671 * instruct the TCP stack to allow more than a single ms of data
3672 * to be queued in the stack. The value is a bit-shift of 1
3673 * second, so 7 is ~8ms of queued data. Only affects local TCP
3676 sk_pacing_shift_update(skb->sk, 7);
3678 fast_tx = rcu_dereference(sta->fast_tx);
3681 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3685 if (skb_is_gso(skb)) {
3686 struct sk_buff *segs;
3688 segs = skb_gso_segment(skb, 0);
3696 /* we cannot process non-linear frames on this path */
3697 if (skb_linearize(skb)) {
3702 /* the frame could be fragmented, software-encrypted, and other
3703 * things so we cannot really handle checksum offload with it -
3704 * fix it up in software before we handle anything else.
3706 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3707 skb_set_transport_header(skb,
3708 skb_checksum_start_offset(skb));
3709 if (skb_checksum_help(skb))
3722 skb = ieee80211_build_hdr(sdata, skb, info_flags,
3727 ieee80211_tx_stats(dev, skb->len);
3729 ieee80211_xmit(sdata, sta, skb, 0);
3738 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3743 err = skb_ensure_writable(skb, ETH_HLEN);
3747 eth = (void *)skb->data;
3748 ether_addr_copy(eth->h_dest, sta->sta.addr);
3753 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3754 struct net_device *dev)
3756 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3757 const struct ethhdr *eth = (void *)skb->data;
3758 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3761 if (likely(!is_multicast_ether_addr(eth->h_dest)))
3764 switch (sdata->vif.type) {
3765 case NL80211_IFTYPE_AP_VLAN:
3766 if (sdata->u.vlan.sta)
3768 if (sdata->wdev.use_4addr)
3771 case NL80211_IFTYPE_AP:
3772 /* check runtime toggle for this bss */
3773 if (!sdata->bss->multicast_to_unicast)
3780 /* multicast to unicast conversion only for some payload */
3781 ethertype = eth->h_proto;
3782 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3783 ethertype = ethvlan->h_vlan_encapsulated_proto;
3784 switch (ethertype) {
3785 case htons(ETH_P_ARP):
3786 case htons(ETH_P_IP):
3787 case htons(ETH_P_IPV6):
3797 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3798 struct sk_buff_head *queue)
3800 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3801 struct ieee80211_local *local = sdata->local;
3802 const struct ethhdr *eth = (struct ethhdr *)skb->data;
3803 struct sta_info *sta, *first = NULL;
3804 struct sk_buff *cloned_skb;
3808 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3809 if (sdata != sta->sdata)
3810 /* AP-VLAN mismatch */
3812 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3813 /* do not send back to source */
3819 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3822 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3823 dev_kfree_skb(cloned_skb);
3826 __skb_queue_tail(queue, cloned_skb);
3829 if (likely(first)) {
3830 if (unlikely(ieee80211_change_da(skb, first)))
3832 __skb_queue_tail(queue, skb);
3834 /* no STA connected, drop */
3841 __skb_queue_purge(queue);
3842 __skb_queue_tail(queue, skb);
3848 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3849 * @skb: packet to be sent
3850 * @dev: incoming interface
3852 * On failure skb will be freed.
3854 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3855 struct net_device *dev)
3857 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3858 struct sk_buff_head queue;
3860 __skb_queue_head_init(&queue);
3861 ieee80211_convert_to_unicast(skb, dev, &queue);
3862 while ((skb = __skb_dequeue(&queue)))
3863 __ieee80211_subif_start_xmit(skb, dev, 0, 0);
3865 __ieee80211_subif_start_xmit(skb, dev, 0, 0);
3868 return NETDEV_TX_OK;
3872 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3873 struct sk_buff *skb, u32 info_flags)
3875 struct ieee80211_hdr *hdr;
3876 struct ieee80211_tx_data tx = {
3877 .local = sdata->local,
3880 struct sta_info *sta;
3884 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3886 skb = ERR_PTR(-EINVAL);
3890 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0);
3894 hdr = (void *)skb->data;
3895 tx.sta = sta_info_get(sdata, hdr->addr1);
3898 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3901 return ERR_PTR(-EINVAL);
3910 * ieee80211_clear_tx_pending may not be called in a context where
3911 * it is possible that it packets could come in again.
3913 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3915 struct sk_buff *skb;
3918 for (i = 0; i < local->hw.queues; i++) {
3919 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3920 ieee80211_free_txskb(&local->hw, skb);
3925 * Returns false if the frame couldn't be transmitted but was queued instead,
3926 * which in this case means re-queued -- take as an indication to stop sending
3927 * more pending frames.
3929 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3930 struct sk_buff *skb)
3932 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3933 struct ieee80211_sub_if_data *sdata;
3934 struct sta_info *sta;
3935 struct ieee80211_hdr *hdr;
3937 struct ieee80211_chanctx_conf *chanctx_conf;
3939 sdata = vif_to_sdata(info->control.vif);
3941 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3942 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3943 if (unlikely(!chanctx_conf)) {
3947 info->band = chanctx_conf->def.chan->band;
3948 result = ieee80211_tx(sdata, NULL, skb, true, 0);
3950 struct sk_buff_head skbs;
3952 __skb_queue_head_init(&skbs);
3953 __skb_queue_tail(&skbs, skb);
3955 hdr = (struct ieee80211_hdr *)skb->data;
3956 sta = sta_info_get(sdata, hdr->addr1);
3958 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3965 * Transmit all pending packets. Called from tasklet.
3967 void ieee80211_tx_pending(unsigned long data)
3969 struct ieee80211_local *local = (struct ieee80211_local *)data;
3970 unsigned long flags;
3976 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3977 for (i = 0; i < local->hw.queues; i++) {
3979 * If queue is stopped by something other than due to pending
3980 * frames, or we have no pending frames, proceed to next queue.
3982 if (local->queue_stop_reasons[i] ||
3983 skb_queue_empty(&local->pending[i]))
3986 while (!skb_queue_empty(&local->pending[i])) {
3987 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3988 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3990 if (WARN_ON(!info->control.vif)) {
3991 ieee80211_free_txskb(&local->hw, skb);
3995 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3998 txok = ieee80211_tx_pending_skb(local, skb);
3999 spin_lock_irqsave(&local->queue_stop_reason_lock,
4005 if (skb_queue_empty(&local->pending[i]))
4006 ieee80211_propagate_queue_wake(local, i);
4008 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4013 /* functions for drivers to get certain frames */
4015 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4016 struct ps_data *ps, struct sk_buff *skb,
4021 int i, have_bits = 0, n1, n2;
4023 /* Generate bitmap for TIM only if there are any STAs in power save
4025 if (atomic_read(&ps->num_sta_ps) > 0)
4026 /* in the hope that this is faster than
4027 * checking byte-for-byte */
4028 have_bits = !bitmap_empty((unsigned long *)ps->tim,
4029 IEEE80211_MAX_AID+1);
4031 if (ps->dtim_count == 0)
4032 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
4037 tim = pos = skb_put(skb, 6);
4038 *pos++ = WLAN_EID_TIM;
4040 *pos++ = ps->dtim_count;
4041 *pos++ = sdata->vif.bss_conf.dtim_period;
4043 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
4046 ps->dtim_bc_mc = aid0 == 1;
4049 /* Find largest even number N1 so that bits numbered 1 through
4050 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4051 * (N2 + 1) x 8 through 2007 are 0. */
4053 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4060 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4067 /* Bitmap control */
4069 /* Part Virt Bitmap */
4070 skb_put(skb, n2 - n1);
4071 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
4073 tim[1] = n2 - n1 + 4;
4075 *pos++ = aid0; /* Bitmap control */
4076 *pos++ = 0; /* Part Virt Bitmap */
4080 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4081 struct ps_data *ps, struct sk_buff *skb,
4084 struct ieee80211_local *local = sdata->local;
4087 * Not very nice, but we want to allow the driver to call
4088 * ieee80211_beacon_get() as a response to the set_tim()
4089 * callback. That, however, is already invoked under the
4090 * sta_lock to guarantee consistent and race-free update
4091 * of the tim bitmap in mac80211 and the driver.
4093 if (local->tim_in_locked_section) {
4094 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4096 spin_lock_bh(&local->tim_lock);
4097 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4098 spin_unlock_bh(&local->tim_lock);
4104 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
4105 struct beacon_data *beacon)
4107 struct probe_resp *resp;
4109 size_t beacon_data_len;
4111 u8 count = beacon->csa_current_counter;
4113 switch (sdata->vif.type) {
4114 case NL80211_IFTYPE_AP:
4115 beacon_data = beacon->tail;
4116 beacon_data_len = beacon->tail_len;
4118 case NL80211_IFTYPE_ADHOC:
4119 beacon_data = beacon->head;
4120 beacon_data_len = beacon->head_len;
4122 case NL80211_IFTYPE_MESH_POINT:
4123 beacon_data = beacon->head;
4124 beacon_data_len = beacon->head_len;
4131 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
4132 resp = rcu_dereference(sdata->u.ap.probe_resp);
4134 if (beacon->csa_counter_offsets[i]) {
4135 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
4141 beacon_data[beacon->csa_counter_offsets[i]] = count;
4144 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
4145 resp->data[resp->csa_counter_offsets[i]] = count;
4150 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
4152 beacon->csa_current_counter--;
4154 /* the counter should never reach 0 */
4155 WARN_ON_ONCE(!beacon->csa_current_counter);
4157 return beacon->csa_current_counter;
4160 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4162 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4163 struct beacon_data *beacon = NULL;
4168 if (sdata->vif.type == NL80211_IFTYPE_AP)
4169 beacon = rcu_dereference(sdata->u.ap.beacon);
4170 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4171 beacon = rcu_dereference(sdata->u.ibss.presp);
4172 else if (ieee80211_vif_is_mesh(&sdata->vif))
4173 beacon = rcu_dereference(sdata->u.mesh.beacon);
4178 count = __ieee80211_csa_update_counter(beacon);
4184 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4186 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter)
4188 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4189 struct beacon_data *beacon = NULL;
4193 if (sdata->vif.type == NL80211_IFTYPE_AP)
4194 beacon = rcu_dereference(sdata->u.ap.beacon);
4195 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4196 beacon = rcu_dereference(sdata->u.ibss.presp);
4197 else if (ieee80211_vif_is_mesh(&sdata->vif))
4198 beacon = rcu_dereference(sdata->u.mesh.beacon);
4203 if (counter < beacon->csa_current_counter)
4204 beacon->csa_current_counter = counter;
4209 EXPORT_SYMBOL(ieee80211_csa_set_counter);
4211 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4213 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4214 struct beacon_data *beacon = NULL;
4216 size_t beacon_data_len;
4219 if (!ieee80211_sdata_running(sdata))
4223 if (vif->type == NL80211_IFTYPE_AP) {
4224 struct ieee80211_if_ap *ap = &sdata->u.ap;
4226 beacon = rcu_dereference(ap->beacon);
4227 if (WARN_ON(!beacon || !beacon->tail))
4229 beacon_data = beacon->tail;
4230 beacon_data_len = beacon->tail_len;
4231 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4232 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4234 beacon = rcu_dereference(ifibss->presp);
4238 beacon_data = beacon->head;
4239 beacon_data_len = beacon->head_len;
4240 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4241 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4243 beacon = rcu_dereference(ifmsh->beacon);
4247 beacon_data = beacon->head;
4248 beacon_data_len = beacon->head_len;
4254 if (!beacon->csa_counter_offsets[0])
4257 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4260 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4267 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4269 static struct sk_buff *
4270 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4271 struct ieee80211_vif *vif,
4272 struct ieee80211_mutable_offsets *offs,
4275 struct ieee80211_local *local = hw_to_local(hw);
4276 struct beacon_data *beacon = NULL;
4277 struct sk_buff *skb = NULL;
4278 struct ieee80211_tx_info *info;
4279 struct ieee80211_sub_if_data *sdata = NULL;
4280 enum nl80211_band band;
4281 struct ieee80211_tx_rate_control txrc;
4282 struct ieee80211_chanctx_conf *chanctx_conf;
4283 int csa_off_base = 0;
4287 sdata = vif_to_sdata(vif);
4288 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4290 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4294 memset(offs, 0, sizeof(*offs));
4296 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4297 struct ieee80211_if_ap *ap = &sdata->u.ap;
4299 beacon = rcu_dereference(ap->beacon);
4301 if (beacon->csa_counter_offsets[0]) {
4303 __ieee80211_csa_update_counter(beacon);
4305 ieee80211_set_csa(sdata, beacon);
4309 * headroom, head length,
4310 * tail length and maximum TIM length
4312 skb = dev_alloc_skb(local->tx_headroom +
4314 beacon->tail_len + 256 +
4315 local->hw.extra_beacon_tailroom);
4319 skb_reserve(skb, local->tx_headroom);
4320 skb_put_data(skb, beacon->head, beacon->head_len);
4322 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4326 offs->tim_offset = beacon->head_len;
4327 offs->tim_length = skb->len - beacon->head_len;
4329 /* for AP the csa offsets are from tail */
4330 csa_off_base = skb->len;
4334 skb_put_data(skb, beacon->tail,
4338 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4339 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4340 struct ieee80211_hdr *hdr;
4342 beacon = rcu_dereference(ifibss->presp);
4346 if (beacon->csa_counter_offsets[0]) {
4348 __ieee80211_csa_update_counter(beacon);
4350 ieee80211_set_csa(sdata, beacon);
4353 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4354 local->hw.extra_beacon_tailroom);
4357 skb_reserve(skb, local->tx_headroom);
4358 skb_put_data(skb, beacon->head, beacon->head_len);
4360 hdr = (struct ieee80211_hdr *) skb->data;
4361 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4362 IEEE80211_STYPE_BEACON);
4363 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4364 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4366 beacon = rcu_dereference(ifmsh->beacon);
4370 if (beacon->csa_counter_offsets[0]) {
4372 /* TODO: For mesh csa_counter is in TU, so
4373 * decrementing it by one isn't correct, but
4374 * for now we leave it consistent with overall
4375 * mac80211's behavior.
4377 __ieee80211_csa_update_counter(beacon);
4379 ieee80211_set_csa(sdata, beacon);
4382 if (ifmsh->sync_ops)
4383 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4385 skb = dev_alloc_skb(local->tx_headroom +
4389 local->hw.extra_beacon_tailroom);
4392 skb_reserve(skb, local->tx_headroom);
4393 skb_put_data(skb, beacon->head, beacon->head_len);
4394 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4397 offs->tim_offset = beacon->head_len;
4398 offs->tim_length = skb->len - beacon->head_len;
4401 skb_put_data(skb, beacon->tail, beacon->tail_len);
4408 if (offs && beacon) {
4411 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4412 u16 csa_off = beacon->csa_counter_offsets[i];
4417 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4421 band = chanctx_conf->def.chan->band;
4423 info = IEEE80211_SKB_CB(skb);
4425 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4426 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4429 memset(&txrc, 0, sizeof(txrc));
4431 txrc.sband = local->hw.wiphy->bands[band];
4432 txrc.bss_conf = &sdata->vif.bss_conf;
4434 txrc.reported_rate.idx = -1;
4435 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4437 rate_control_get_rate(sdata, NULL, &txrc);
4439 info->control.vif = vif;
4441 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4442 IEEE80211_TX_CTL_ASSIGN_SEQ |
4443 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4451 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4452 struct ieee80211_vif *vif,
4453 struct ieee80211_mutable_offsets *offs)
4455 return __ieee80211_beacon_get(hw, vif, offs, true);
4457 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4459 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4460 struct ieee80211_vif *vif,
4461 u16 *tim_offset, u16 *tim_length)
4463 struct ieee80211_mutable_offsets offs = {};
4464 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4465 struct sk_buff *copy;
4466 struct ieee80211_supported_band *sband;
4473 *tim_offset = offs.tim_offset;
4476 *tim_length = offs.tim_length;
4478 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4479 !hw_to_local(hw)->monitors)
4482 /* send a copy to monitor interfaces */
4483 copy = skb_copy(bcn, GFP_ATOMIC);
4487 shift = ieee80211_vif_get_shift(vif);
4488 sband = ieee80211_get_sband(vif_to_sdata(vif));
4492 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4496 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4498 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4499 struct ieee80211_vif *vif)
4501 struct ieee80211_if_ap *ap = NULL;
4502 struct sk_buff *skb = NULL;
4503 struct probe_resp *presp = NULL;
4504 struct ieee80211_hdr *hdr;
4505 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4507 if (sdata->vif.type != NL80211_IFTYPE_AP)
4513 presp = rcu_dereference(ap->probe_resp);
4517 skb = dev_alloc_skb(presp->len);
4521 skb_put_data(skb, presp->data, presp->len);
4523 hdr = (struct ieee80211_hdr *) skb->data;
4524 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4530 EXPORT_SYMBOL(ieee80211_proberesp_get);
4532 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4533 struct ieee80211_vif *vif)
4535 struct ieee80211_sub_if_data *sdata;
4536 struct ieee80211_if_managed *ifmgd;
4537 struct ieee80211_pspoll *pspoll;
4538 struct ieee80211_local *local;
4539 struct sk_buff *skb;
4541 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4544 sdata = vif_to_sdata(vif);
4545 ifmgd = &sdata->u.mgd;
4546 local = sdata->local;
4548 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4552 skb_reserve(skb, local->hw.extra_tx_headroom);
4554 pspoll = skb_put_zero(skb, sizeof(*pspoll));
4555 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4556 IEEE80211_STYPE_PSPOLL);
4557 pspoll->aid = cpu_to_le16(ifmgd->aid);
4559 /* aid in PS-Poll has its two MSBs each set to 1 */
4560 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4562 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4563 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4567 EXPORT_SYMBOL(ieee80211_pspoll_get);
4569 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4570 struct ieee80211_vif *vif,
4573 struct ieee80211_hdr_3addr *nullfunc;
4574 struct ieee80211_sub_if_data *sdata;
4575 struct ieee80211_if_managed *ifmgd;
4576 struct ieee80211_local *local;
4577 struct sk_buff *skb;
4580 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4583 sdata = vif_to_sdata(vif);
4584 ifmgd = &sdata->u.mgd;
4585 local = sdata->local;
4588 struct sta_info *sta;
4591 sta = sta_info_get(sdata, ifmgd->bssid);
4592 qos = sta && sta->sta.wme;
4596 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4597 sizeof(*nullfunc) + 2);
4601 skb_reserve(skb, local->hw.extra_tx_headroom);
4603 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4604 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4605 IEEE80211_STYPE_NULLFUNC |
4606 IEEE80211_FCTL_TODS);
4608 __le16 qos = cpu_to_le16(7);
4610 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
4611 IEEE80211_STYPE_NULLFUNC) !=
4612 IEEE80211_STYPE_QOS_NULLFUNC);
4613 nullfunc->frame_control |=
4614 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
4616 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
4617 skb_put_data(skb, &qos, sizeof(qos));
4620 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4621 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4622 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4626 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4628 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4630 const u8 *ssid, size_t ssid_len,
4633 struct ieee80211_local *local = hw_to_local(hw);
4634 struct ieee80211_hdr_3addr *hdr;
4635 struct sk_buff *skb;
4639 ie_ssid_len = 2 + ssid_len;
4641 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4642 ie_ssid_len + tailroom);
4646 skb_reserve(skb, local->hw.extra_tx_headroom);
4648 hdr = skb_put_zero(skb, sizeof(*hdr));
4649 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4650 IEEE80211_STYPE_PROBE_REQ);
4651 eth_broadcast_addr(hdr->addr1);
4652 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4653 eth_broadcast_addr(hdr->addr3);
4655 pos = skb_put(skb, ie_ssid_len);
4656 *pos++ = WLAN_EID_SSID;
4659 memcpy(pos, ssid, ssid_len);
4664 EXPORT_SYMBOL(ieee80211_probereq_get);
4666 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4667 const void *frame, size_t frame_len,
4668 const struct ieee80211_tx_info *frame_txctl,
4669 struct ieee80211_rts *rts)
4671 const struct ieee80211_hdr *hdr = frame;
4673 rts->frame_control =
4674 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4675 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4677 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4678 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4680 EXPORT_SYMBOL(ieee80211_rts_get);
4682 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4683 const void *frame, size_t frame_len,
4684 const struct ieee80211_tx_info *frame_txctl,
4685 struct ieee80211_cts *cts)
4687 const struct ieee80211_hdr *hdr = frame;
4689 cts->frame_control =
4690 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4691 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4692 frame_len, frame_txctl);
4693 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4695 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4698 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4699 struct ieee80211_vif *vif)
4701 struct ieee80211_local *local = hw_to_local(hw);
4702 struct sk_buff *skb = NULL;
4703 struct ieee80211_tx_data tx;
4704 struct ieee80211_sub_if_data *sdata;
4706 struct ieee80211_tx_info *info;
4707 struct ieee80211_chanctx_conf *chanctx_conf;
4709 sdata = vif_to_sdata(vif);
4712 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4717 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4718 struct beacon_data *beacon =
4719 rcu_dereference(sdata->u.ap.beacon);
4721 if (!beacon || !beacon->head)
4724 ps = &sdata->u.ap.ps;
4725 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4726 ps = &sdata->u.mesh.ps;
4731 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4732 goto out; /* send buffered bc/mc only after DTIM beacon */
4735 skb = skb_dequeue(&ps->bc_buf);
4738 local->total_ps_buffered--;
4740 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4741 struct ieee80211_hdr *hdr =
4742 (struct ieee80211_hdr *) skb->data;
4743 /* more buffered multicast/broadcast frames ==> set
4744 * MoreData flag in IEEE 802.11 header to inform PS
4746 hdr->frame_control |=
4747 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4750 if (sdata->vif.type == NL80211_IFTYPE_AP)
4751 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4752 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4754 ieee80211_free_txskb(hw, skb);
4757 info = IEEE80211_SKB_CB(skb);
4759 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4760 info->band = chanctx_conf->def.chan->band;
4762 if (invoke_tx_handlers(&tx))
4769 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4771 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4773 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4774 struct ieee80211_sub_if_data *sdata = sta->sdata;
4775 struct ieee80211_local *local = sdata->local;
4779 lockdep_assert_held(&local->sta_mtx);
4781 /* only some cases are supported right now */
4782 switch (sdata->vif.type) {
4783 case NL80211_IFTYPE_STATION:
4784 case NL80211_IFTYPE_AP:
4785 case NL80211_IFTYPE_AP_VLAN:
4792 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4795 if (sta->reserved_tid == tid) {
4800 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4801 sdata_err(sdata, "TID reservation already active\n");
4806 ieee80211_stop_vif_queues(sdata->local, sdata,
4807 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4811 /* Tear down BA sessions so we stop aggregating on this TID */
4812 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4813 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4814 __ieee80211_stop_tx_ba_session(sta, tid,
4815 AGG_STOP_LOCAL_REQUEST);
4818 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4819 __ieee80211_flush_queues(local, sdata, queues, false);
4821 sta->reserved_tid = tid;
4823 ieee80211_wake_vif_queues(local, sdata,
4824 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4826 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4827 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4833 EXPORT_SYMBOL(ieee80211_reserve_tid);
4835 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4837 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4838 struct ieee80211_sub_if_data *sdata = sta->sdata;
4840 lockdep_assert_held(&sdata->local->sta_mtx);
4842 /* only some cases are supported right now */
4843 switch (sdata->vif.type) {
4844 case NL80211_IFTYPE_STATION:
4845 case NL80211_IFTYPE_AP:
4846 case NL80211_IFTYPE_AP_VLAN:
4853 if (tid != sta->reserved_tid) {
4854 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4858 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4860 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4862 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4863 struct sk_buff *skb, int tid,
4864 enum nl80211_band band, u32 txdata_flags)
4866 int ac = ieee80211_ac_from_tid(tid);
4868 skb_reset_mac_header(skb);
4869 skb_set_queue_mapping(skb, ac);
4870 skb->priority = tid;
4872 skb->dev = sdata->dev;
4875 * The other path calling ieee80211_xmit is from the tasklet,
4876 * and while we can handle concurrent transmissions locking
4877 * requirements are that we do not come into tx with bhs on.
4880 IEEE80211_SKB_CB(skb)->band = band;
4881 ieee80211_xmit(sdata, NULL, skb, txdata_flags);
4885 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
4886 const u8 *buf, size_t len,
4887 const u8 *dest, __be16 proto, bool unencrypted)
4889 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4890 struct ieee80211_local *local = sdata->local;
4891 struct sk_buff *skb;
4892 struct ethhdr *ehdr;
4896 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
4897 * or Pre-Authentication
4899 if (proto != sdata->control_port_protocol &&
4900 proto != cpu_to_be16(ETH_P_PREAUTH))
4903 if (proto == sdata->control_port_protocol)
4904 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
4907 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT;
4911 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4912 sizeof(struct ethhdr) + len);
4916 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
4918 skb_put_data(skb, buf, len);
4920 ehdr = skb_push(skb, sizeof(struct ethhdr));
4921 memcpy(ehdr->h_dest, dest, ETH_ALEN);
4922 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
4923 ehdr->h_proto = proto;
4926 skb->protocol = htons(ETH_P_802_3);
4927 skb_reset_network_header(skb);
4928 skb_reset_mac_header(skb);
4931 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags);