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)))
660 if (!skip_hw && tx->key &&
661 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
662 info->control.hw_key = &tx->key->conf;
663 } else if (!ieee80211_is_mgmt(hdr->frame_control) && tx->sta &&
664 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) {
671 static ieee80211_tx_result debug_noinline
672 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
674 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
675 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
676 struct ieee80211_supported_band *sband;
678 struct ieee80211_tx_rate_control txrc;
679 struct ieee80211_sta_rates *ratetbl = NULL;
682 memset(&txrc, 0, sizeof(txrc));
684 sband = tx->local->hw.wiphy->bands[info->band];
686 len = min_t(u32, tx->skb->len + FCS_LEN,
687 tx->local->hw.wiphy->frag_threshold);
689 /* set up the tx rate control struct we give the RC algo */
690 txrc.hw = &tx->local->hw;
692 txrc.bss_conf = &tx->sdata->vif.bss_conf;
694 txrc.reported_rate.idx = -1;
695 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
697 if (tx->sdata->rc_has_mcs_mask[info->band])
698 txrc.rate_idx_mcs_mask =
699 tx->sdata->rc_rateidx_mcs_mask[info->band];
701 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
702 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
703 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
704 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
706 /* set up RTS protection if desired */
707 if (len > tx->local->hw.wiphy->rts_threshold) {
711 info->control.use_rts = txrc.rts;
712 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
715 * Use short preamble if the BSS can handle it, but not for
716 * management frames unless we know the receiver can handle
717 * that -- the management frame might be to a station that
718 * just wants a probe response.
720 if (tx->sdata->vif.bss_conf.use_short_preamble &&
721 (ieee80211_is_data(hdr->frame_control) ||
722 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
723 txrc.short_preamble = true;
725 info->control.short_preamble = txrc.short_preamble;
727 /* don't ask rate control when rate already injected via radiotap */
728 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
732 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
735 * Lets not bother rate control if we're associated and cannot
736 * talk to the sta. This should not happen.
738 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
739 !rate_usable_index_exists(sband, &tx->sta->sta),
740 "%s: Dropped data frame as no usable bitrate found while "
741 "scanning and associated. Target station: "
742 "%pM on %d GHz band\n",
743 tx->sdata->name, hdr->addr1,
748 * If we're associated with the sta at this point we know we can at
749 * least send the frame at the lowest bit rate.
751 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
753 if (tx->sta && !info->control.skip_table)
754 ratetbl = rcu_dereference(tx->sta->sta.rates);
756 if (unlikely(info->control.rates[0].idx < 0)) {
758 struct ieee80211_tx_rate rate = {
759 .idx = ratetbl->rate[0].idx,
760 .flags = ratetbl->rate[0].flags,
761 .count = ratetbl->rate[0].count
764 if (ratetbl->rate[0].idx < 0)
772 tx->rate = info->control.rates[0];
775 if (txrc.reported_rate.idx < 0) {
776 txrc.reported_rate = tx->rate;
777 if (tx->sta && ieee80211_is_data(hdr->frame_control))
778 tx->sta->tx_stats.last_rate = txrc.reported_rate;
780 tx->sta->tx_stats.last_rate = txrc.reported_rate;
785 if (unlikely(!info->control.rates[0].count))
786 info->control.rates[0].count = 1;
788 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
789 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
790 info->control.rates[0].count = 1;
795 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
797 u16 *seq = &sta->tid_seq[tid];
798 __le16 ret = cpu_to_le16(*seq);
800 /* Increase the sequence number. */
801 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
806 static ieee80211_tx_result debug_noinline
807 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
809 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
810 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
814 * Packet injection may want to control the sequence
815 * number, if we have no matching interface then we
816 * neither assign one ourselves nor ask the driver to.
818 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
821 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
824 if (ieee80211_hdrlen(hdr->frame_control) < 24)
827 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
831 * Anything but QoS data that has a sequence number field
832 * (is long enough) gets a sequence number from the global
833 * counter. QoS data frames with a multicast destination
834 * also use the global counter (802.11-2012 9.3.2.10).
836 if (!ieee80211_is_data_qos(hdr->frame_control) ||
837 is_multicast_ether_addr(hdr->addr1)) {
838 if (tx->flags & IEEE80211_TX_NO_SEQNO)
840 /* driver should assign sequence number */
841 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
842 /* for pure STA mode without beacons, we can do it */
843 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
844 tx->sdata->sequence_number += 0x10;
846 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
851 * This should be true for injected/management frames only, for
852 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
853 * above since they are not QoS-data frames.
858 /* include per-STA, per-TID sequence counter */
859 tid = ieee80211_get_tid(hdr);
860 tx->sta->tx_stats.msdu[tid]++;
862 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
867 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
868 struct sk_buff *skb, int hdrlen,
871 struct ieee80211_local *local = tx->local;
872 struct ieee80211_tx_info *info;
874 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
875 int pos = hdrlen + per_fragm;
876 int rem = skb->len - hdrlen - per_fragm;
878 if (WARN_ON(rem < 0))
881 /* first fragment was already added to queue by caller */
884 int fraglen = per_fragm;
889 tmp = dev_alloc_skb(local->tx_headroom +
891 tx->sdata->encrypt_headroom +
892 IEEE80211_ENCRYPT_TAILROOM);
896 __skb_queue_tail(&tx->skbs, tmp);
899 local->tx_headroom + tx->sdata->encrypt_headroom);
901 /* copy control information */
902 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
904 info = IEEE80211_SKB_CB(tmp);
905 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
906 IEEE80211_TX_CTL_FIRST_FRAGMENT);
909 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
911 skb_copy_queue_mapping(tmp, skb);
912 tmp->priority = skb->priority;
915 /* copy header and data */
916 skb_put_data(tmp, skb->data, hdrlen);
917 skb_put_data(tmp, skb->data + pos, fraglen);
922 /* adjust first fragment's length */
923 skb_trim(skb, hdrlen + per_fragm);
927 static ieee80211_tx_result debug_noinline
928 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
930 struct sk_buff *skb = tx->skb;
931 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
932 struct ieee80211_hdr *hdr = (void *)skb->data;
933 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
937 /* no matter what happens, tx->skb moves to tx->skbs */
938 __skb_queue_tail(&tx->skbs, skb);
941 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
944 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
948 * Warn when submitting a fragmented A-MPDU frame and drop it.
949 * This scenario is handled in ieee80211_tx_prepare but extra
950 * caution taken here as fragmented ampdu may cause Tx stop.
952 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
955 hdrlen = ieee80211_hdrlen(hdr->frame_control);
957 /* internal error, why isn't DONTFRAG set? */
958 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
962 * Now fragment the frame. This will allocate all the fragments and
963 * chain them (using skb as the first fragment) to skb->next.
964 * During transmission, we will remove the successfully transmitted
965 * fragments from this list. When the low-level driver rejects one
966 * of the fragments then we will simply pretend to accept the skb
967 * but store it away as pending.
969 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
972 /* update duration/seq/flags of fragments */
975 skb_queue_walk(&tx->skbs, skb) {
976 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
978 hdr = (void *)skb->data;
979 info = IEEE80211_SKB_CB(skb);
981 if (!skb_queue_is_last(&tx->skbs, skb)) {
982 hdr->frame_control |= morefrags;
984 * No multi-rate retries for fragmented frames, that
985 * would completely throw off the NAV at other STAs.
987 info->control.rates[1].idx = -1;
988 info->control.rates[2].idx = -1;
989 info->control.rates[3].idx = -1;
990 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
991 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
993 hdr->frame_control &= ~morefrags;
995 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
1002 static ieee80211_tx_result debug_noinline
1003 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1005 struct sk_buff *skb;
1011 skb_queue_walk(&tx->skbs, skb) {
1012 ac = skb_get_queue_mapping(skb);
1013 tx->sta->tx_stats.bytes[ac] += skb->len;
1016 tx->sta->tx_stats.packets[ac]++;
1021 static ieee80211_tx_result debug_noinline
1022 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1027 switch (tx->key->conf.cipher) {
1028 case WLAN_CIPHER_SUITE_WEP40:
1029 case WLAN_CIPHER_SUITE_WEP104:
1030 return ieee80211_crypto_wep_encrypt(tx);
1031 case WLAN_CIPHER_SUITE_TKIP:
1032 return ieee80211_crypto_tkip_encrypt(tx);
1033 case WLAN_CIPHER_SUITE_CCMP:
1034 return ieee80211_crypto_ccmp_encrypt(
1035 tx, IEEE80211_CCMP_MIC_LEN);
1036 case WLAN_CIPHER_SUITE_CCMP_256:
1037 return ieee80211_crypto_ccmp_encrypt(
1038 tx, IEEE80211_CCMP_256_MIC_LEN);
1039 case WLAN_CIPHER_SUITE_AES_CMAC:
1040 return ieee80211_crypto_aes_cmac_encrypt(tx);
1041 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1042 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1043 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1044 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1045 return ieee80211_crypto_aes_gmac_encrypt(tx);
1046 case WLAN_CIPHER_SUITE_GCMP:
1047 case WLAN_CIPHER_SUITE_GCMP_256:
1048 return ieee80211_crypto_gcmp_encrypt(tx);
1050 return ieee80211_crypto_hw_encrypt(tx);
1056 static ieee80211_tx_result debug_noinline
1057 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1059 struct sk_buff *skb;
1060 struct ieee80211_hdr *hdr;
1064 skb_queue_walk(&tx->skbs, skb) {
1065 hdr = (void *) skb->data;
1066 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1067 break; /* must not overwrite AID */
1068 if (!skb_queue_is_last(&tx->skbs, skb)) {
1069 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1070 next_len = next->len;
1073 group_addr = is_multicast_ether_addr(hdr->addr1);
1076 ieee80211_duration(tx, skb, group_addr, next_len);
1082 /* actual transmit path */
1084 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1085 struct sk_buff *skb,
1086 struct ieee80211_tx_info *info,
1087 struct tid_ampdu_tx *tid_tx,
1090 bool queued = false;
1091 bool reset_agg_timer = false;
1092 struct sk_buff *purge_skb = NULL;
1094 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1095 info->flags |= IEEE80211_TX_CTL_AMPDU;
1096 reset_agg_timer = true;
1097 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1099 * nothing -- this aggregation session is being started
1100 * but that might still fail with the driver
1102 } else if (!tx->sta->sta.txq[tid]) {
1103 spin_lock(&tx->sta->lock);
1105 * Need to re-check now, because we may get here
1107 * 1) in the window during which the setup is actually
1108 * already done, but not marked yet because not all
1109 * packets are spliced over to the driver pending
1110 * queue yet -- if this happened we acquire the lock
1111 * either before or after the splice happens, but
1112 * need to recheck which of these cases happened.
1114 * 2) during session teardown, if the OPERATIONAL bit
1115 * was cleared due to the teardown but the pointer
1116 * hasn't been assigned NULL yet (or we loaded it
1117 * before it was assigned) -- in this case it may
1118 * now be NULL which means we should just let the
1119 * packet pass through because splicing the frames
1120 * back is already done.
1122 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1125 /* do nothing, let packet pass through */
1126 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1127 info->flags |= IEEE80211_TX_CTL_AMPDU;
1128 reset_agg_timer = true;
1131 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1132 clear_sta_flag(tx->sta, WLAN_STA_SP);
1133 ps_dbg(tx->sta->sdata,
1134 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1135 tx->sta->sta.addr, tx->sta->sta.aid);
1137 info->control.vif = &tx->sdata->vif;
1138 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1139 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1140 __skb_queue_tail(&tid_tx->pending, skb);
1141 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1142 purge_skb = __skb_dequeue(&tid_tx->pending);
1144 spin_unlock(&tx->sta->lock);
1147 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1150 /* reset session timer */
1151 if (reset_agg_timer)
1152 tid_tx->last_tx = jiffies;
1159 * pass %NULL for the station if unknown, a valid pointer if known
1160 * or an ERR_PTR() if the station is known not to exist
1162 static ieee80211_tx_result
1163 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1164 struct ieee80211_tx_data *tx,
1165 struct sta_info *sta, struct sk_buff *skb)
1167 struct ieee80211_local *local = sdata->local;
1168 struct ieee80211_hdr *hdr;
1169 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1172 memset(tx, 0, sizeof(*tx));
1176 __skb_queue_head_init(&tx->skbs);
1179 * If this flag is set to true anywhere, and we get here,
1180 * we are doing the needed processing, so remove the flag
1183 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1185 hdr = (struct ieee80211_hdr *) skb->data;
1191 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1192 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1193 if (!tx->sta && sdata->wdev.use_4addr)
1195 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1196 IEEE80211_TX_CTL_INJECTED) ||
1197 tx->sdata->control_port_protocol == tx->skb->protocol) {
1198 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1200 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1201 tx->sta = sta_info_get(sdata, hdr->addr1);
1204 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1205 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1206 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1207 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1208 struct tid_ampdu_tx *tid_tx;
1210 tid = ieee80211_get_tid(hdr);
1212 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1216 queued = ieee80211_tx_prep_agg(tx, skb, info,
1219 if (unlikely(queued))
1224 if (is_multicast_ether_addr(hdr->addr1)) {
1225 tx->flags &= ~IEEE80211_TX_UNICAST;
1226 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1228 tx->flags |= IEEE80211_TX_UNICAST;
1230 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1231 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1232 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1233 info->flags & IEEE80211_TX_CTL_AMPDU)
1234 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1238 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1239 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1240 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1241 ieee80211_check_fast_xmit(tx->sta);
1244 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1249 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1250 struct ieee80211_vif *vif,
1251 struct sta_info *sta,
1252 struct sk_buff *skb)
1254 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1255 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1256 struct ieee80211_txq *txq = NULL;
1258 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1259 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1262 if (!ieee80211_is_data_present(hdr->frame_control))
1266 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1271 txq = sta->sta.txq[tid];
1279 return to_txq_info(txq);
1282 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1284 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1287 static u32 codel_skb_len_func(const struct sk_buff *skb)
1292 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1294 const struct ieee80211_tx_info *info;
1296 info = (const struct ieee80211_tx_info *)skb->cb;
1297 return info->control.enqueue_time;
1300 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1303 struct ieee80211_local *local;
1304 struct txq_info *txqi;
1306 struct fq_flow *flow;
1309 local = vif_to_sdata(txqi->txq.vif)->local;
1312 if (cvars == &txqi->def_cvars)
1313 flow = &txqi->def_flow;
1315 flow = &fq->flows[cvars - local->cvars];
1317 return fq_flow_dequeue(fq, flow);
1320 static void codel_drop_func(struct sk_buff *skb,
1323 struct ieee80211_local *local;
1324 struct ieee80211_hw *hw;
1325 struct txq_info *txqi;
1328 local = vif_to_sdata(txqi->txq.vif)->local;
1331 ieee80211_free_txskb(hw, skb);
1334 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1336 struct fq_flow *flow)
1338 struct ieee80211_local *local;
1339 struct txq_info *txqi;
1340 struct codel_vars *cvars;
1341 struct codel_params *cparams;
1342 struct codel_stats *cstats;
1344 local = container_of(fq, struct ieee80211_local, fq);
1345 txqi = container_of(tin, struct txq_info, tin);
1346 cstats = &txqi->cstats;
1348 if (txqi->txq.sta) {
1349 struct sta_info *sta = container_of(txqi->txq.sta,
1350 struct sta_info, sta);
1351 cparams = &sta->cparams;
1353 cparams = &local->cparams;
1356 if (flow == &txqi->def_flow)
1357 cvars = &txqi->def_cvars;
1359 cvars = &local->cvars[flow - fq->flows];
1361 return codel_dequeue(txqi,
1367 codel_skb_time_func,
1369 codel_dequeue_func);
1372 static void fq_skb_free_func(struct fq *fq,
1374 struct fq_flow *flow,
1375 struct sk_buff *skb)
1377 struct ieee80211_local *local;
1379 local = container_of(fq, struct ieee80211_local, fq);
1380 ieee80211_free_txskb(&local->hw, skb);
1383 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1386 struct sk_buff *skb)
1388 struct txq_info *txqi;
1390 txqi = container_of(tin, struct txq_info, tin);
1391 return &txqi->def_flow;
1394 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1395 struct txq_info *txqi,
1396 struct sk_buff *skb)
1398 struct fq *fq = &local->fq;
1399 struct fq_tin *tin = &txqi->tin;
1401 ieee80211_set_skb_enqueue_time(skb);
1402 fq_tin_enqueue(fq, tin, skb,
1404 fq_flow_get_default_func);
1407 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1408 struct fq_flow *flow, struct sk_buff *skb,
1411 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1413 return info->control.vif == data;
1416 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1417 struct ieee80211_sub_if_data *sdata)
1419 struct fq *fq = &local->fq;
1420 struct txq_info *txqi;
1422 struct ieee80211_sub_if_data *ap;
1424 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1427 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1432 txqi = to_txq_info(ap->vif.txq);
1435 spin_lock_bh(&fq->lock);
1436 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1438 spin_unlock_bh(&fq->lock);
1441 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1442 struct sta_info *sta,
1443 struct txq_info *txqi, int tid)
1445 fq_tin_init(&txqi->tin);
1446 fq_flow_init(&txqi->def_flow);
1447 codel_vars_init(&txqi->def_cvars);
1448 codel_stats_init(&txqi->cstats);
1449 __skb_queue_head_init(&txqi->frags);
1451 txqi->txq.vif = &sdata->vif;
1454 txqi->txq.sta = &sta->sta;
1455 sta->sta.txq[tid] = &txqi->txq;
1456 txqi->txq.tid = tid;
1457 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1459 sdata->vif.txq = &txqi->txq;
1461 txqi->txq.ac = IEEE80211_AC_BE;
1465 void ieee80211_txq_purge(struct ieee80211_local *local,
1466 struct txq_info *txqi)
1468 struct fq *fq = &local->fq;
1469 struct fq_tin *tin = &txqi->tin;
1471 fq_tin_reset(fq, tin, fq_skb_free_func);
1472 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1475 void ieee80211_txq_set_params(struct ieee80211_local *local)
1477 if (local->hw.wiphy->txq_limit)
1478 local->fq.limit = local->hw.wiphy->txq_limit;
1480 local->hw.wiphy->txq_limit = local->fq.limit;
1482 if (local->hw.wiphy->txq_memory_limit)
1483 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1485 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1487 if (local->hw.wiphy->txq_quantum)
1488 local->fq.quantum = local->hw.wiphy->txq_quantum;
1490 local->hw.wiphy->txq_quantum = local->fq.quantum;
1493 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1495 struct fq *fq = &local->fq;
1498 bool supp_vht = false;
1499 enum nl80211_band band;
1501 if (!local->ops->wake_tx_queue)
1504 ret = fq_init(fq, 4096);
1509 * If the hardware doesn't support VHT, it is safe to limit the maximum
1510 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1512 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1513 struct ieee80211_supported_band *sband;
1515 sband = local->hw.wiphy->bands[band];
1519 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1523 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1525 codel_params_init(&local->cparams);
1526 local->cparams.interval = MS2TIME(100);
1527 local->cparams.target = MS2TIME(20);
1528 local->cparams.ecn = true;
1530 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1532 if (!local->cvars) {
1533 spin_lock_bh(&fq->lock);
1534 fq_reset(fq, fq_skb_free_func);
1535 spin_unlock_bh(&fq->lock);
1539 for (i = 0; i < fq->flows_cnt; i++)
1540 codel_vars_init(&local->cvars[i]);
1542 ieee80211_txq_set_params(local);
1547 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1549 struct fq *fq = &local->fq;
1551 if (!local->ops->wake_tx_queue)
1554 kfree(local->cvars);
1555 local->cvars = NULL;
1557 spin_lock_bh(&fq->lock);
1558 fq_reset(fq, fq_skb_free_func);
1559 spin_unlock_bh(&fq->lock);
1562 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1563 struct ieee80211_sub_if_data *sdata,
1564 struct sta_info *sta,
1565 struct sk_buff *skb)
1567 struct fq *fq = &local->fq;
1568 struct ieee80211_vif *vif;
1569 struct txq_info *txqi;
1571 if (!local->ops->wake_tx_queue ||
1572 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1575 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1576 sdata = container_of(sdata->bss,
1577 struct ieee80211_sub_if_data, u.ap);
1580 txqi = ieee80211_get_txq(local, vif, sta, skb);
1585 spin_lock_bh(&fq->lock);
1586 ieee80211_txq_enqueue(local, txqi, skb);
1587 spin_unlock_bh(&fq->lock);
1589 drv_wake_tx_queue(local, txqi);
1594 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1595 struct ieee80211_vif *vif,
1596 struct ieee80211_sta *sta,
1597 struct sk_buff_head *skbs,
1600 struct ieee80211_tx_control control = {};
1601 struct sk_buff *skb, *tmp;
1602 unsigned long flags;
1604 skb_queue_walk_safe(skbs, skb, tmp) {
1605 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1606 int q = info->hw_queue;
1608 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1609 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1610 __skb_unlink(skb, skbs);
1611 ieee80211_free_txskb(&local->hw, skb);
1616 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1617 if (local->queue_stop_reasons[q] ||
1618 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1619 if (unlikely(info->flags &
1620 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1621 if (local->queue_stop_reasons[q] &
1622 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1624 * Drop off-channel frames if queues
1625 * are stopped for any reason other
1626 * than off-channel operation. Never
1629 spin_unlock_irqrestore(
1630 &local->queue_stop_reason_lock,
1632 ieee80211_purge_tx_queue(&local->hw,
1639 * Since queue is stopped, queue up frames for
1640 * later transmission from the tx-pending
1641 * tasklet when the queue is woken again.
1644 skb_queue_splice_init(skbs,
1645 &local->pending[q]);
1647 skb_queue_splice_tail_init(skbs,
1648 &local->pending[q]);
1650 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1655 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1657 info->control.vif = vif;
1660 __skb_unlink(skb, skbs);
1661 drv_tx(local, &control, skb);
1668 * Returns false if the frame couldn't be transmitted but was queued instead.
1670 static bool __ieee80211_tx(struct ieee80211_local *local,
1671 struct sk_buff_head *skbs, int led_len,
1672 struct sta_info *sta, bool txpending)
1674 struct ieee80211_tx_info *info;
1675 struct ieee80211_sub_if_data *sdata;
1676 struct ieee80211_vif *vif;
1677 struct ieee80211_sta *pubsta;
1678 struct sk_buff *skb;
1682 if (WARN_ON(skb_queue_empty(skbs)))
1685 skb = skb_peek(skbs);
1686 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1687 info = IEEE80211_SKB_CB(skb);
1688 sdata = vif_to_sdata(info->control.vif);
1689 if (sta && !sta->uploaded)
1697 switch (sdata->vif.type) {
1698 case NL80211_IFTYPE_MONITOR:
1699 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1703 sdata = rcu_dereference(local->monitor_sdata);
1707 vif->hw_queue[skb_get_queue_mapping(skb)];
1708 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1709 ieee80211_purge_tx_queue(&local->hw, skbs);
1714 case NL80211_IFTYPE_AP_VLAN:
1715 sdata = container_of(sdata->bss,
1716 struct ieee80211_sub_if_data, u.ap);
1723 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1726 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1728 WARN_ON_ONCE(!skb_queue_empty(skbs));
1734 * Invoke TX handlers, return 0 on success and non-zero if the
1735 * frame was dropped or queued.
1737 * The handlers are split into an early and late part. The latter is everything
1738 * that can be sensitive to reordering, and will be deferred to after packets
1739 * are dequeued from the intermediate queues (when they are enabled).
1741 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1743 ieee80211_tx_result res = TX_DROP;
1745 #define CALL_TXH(txh) \
1748 if (res != TX_CONTINUE) \
1752 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1753 CALL_TXH(ieee80211_tx_h_check_assoc);
1754 CALL_TXH(ieee80211_tx_h_ps_buf);
1755 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1756 CALL_TXH(ieee80211_tx_h_select_key);
1757 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1758 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1761 if (unlikely(res == TX_DROP)) {
1762 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1764 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1766 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1768 } else if (unlikely(res == TX_QUEUED)) {
1769 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1777 * Late handlers can be called while the sta lock is held. Handlers that can
1778 * cause packets to be generated will cause deadlock!
1780 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1782 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1783 ieee80211_tx_result res = TX_CONTINUE;
1785 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1786 __skb_queue_tail(&tx->skbs, tx->skb);
1791 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1792 CALL_TXH(ieee80211_tx_h_sequence);
1793 CALL_TXH(ieee80211_tx_h_fragment);
1794 /* handlers after fragment must be aware of tx info fragmentation! */
1795 CALL_TXH(ieee80211_tx_h_stats);
1796 CALL_TXH(ieee80211_tx_h_encrypt);
1797 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1798 CALL_TXH(ieee80211_tx_h_calculate_duration);
1802 if (unlikely(res == TX_DROP)) {
1803 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1805 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1807 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1809 } else if (unlikely(res == TX_QUEUED)) {
1810 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1817 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1819 int r = invoke_tx_handlers_early(tx);
1823 return invoke_tx_handlers_late(tx);
1826 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1827 struct ieee80211_vif *vif, struct sk_buff *skb,
1828 int band, struct ieee80211_sta **sta)
1830 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1831 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1832 struct ieee80211_tx_data tx;
1833 struct sk_buff *skb2;
1835 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1839 info->control.vif = vif;
1840 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1842 if (invoke_tx_handlers(&tx))
1847 *sta = &tx.sta->sta;
1852 /* this function isn't suitable for fragmented data frames */
1853 skb2 = __skb_dequeue(&tx.skbs);
1854 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1855 ieee80211_free_txskb(hw, skb2);
1856 ieee80211_purge_tx_queue(hw, &tx.skbs);
1862 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1865 * Returns false if the frame couldn't be transmitted but was queued instead.
1867 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1868 struct sta_info *sta, struct sk_buff *skb,
1869 bool txpending, u32 txdata_flags)
1871 struct ieee80211_local *local = sdata->local;
1872 struct ieee80211_tx_data tx;
1873 ieee80211_tx_result res_prepare;
1874 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1878 if (unlikely(skb->len < 10)) {
1883 /* initialises tx */
1885 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1887 tx.flags |= txdata_flags;
1889 if (unlikely(res_prepare == TX_DROP)) {
1890 ieee80211_free_txskb(&local->hw, skb);
1892 } else if (unlikely(res_prepare == TX_QUEUED)) {
1896 /* set up hw_queue value early */
1897 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1898 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1900 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1902 if (invoke_tx_handlers_early(&tx))
1905 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1908 if (!invoke_tx_handlers_late(&tx))
1909 result = __ieee80211_tx(local, &tx.skbs, led_len,
1915 /* device xmit handlers */
1917 enum ieee80211_encrypt {
1923 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1924 struct sk_buff *skb,
1926 enum ieee80211_encrypt encrypt)
1928 struct ieee80211_local *local = sdata->local;
1932 enc_tailroom = encrypt == ENCRYPT_MGMT ||
1933 (encrypt == ENCRYPT_DATA &&
1934 sdata->crypto_tx_tailroom_needed_cnt);
1937 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1938 tail_need -= skb_tailroom(skb);
1939 tail_need = max_t(int, tail_need, 0);
1942 if (skb_cloned(skb) &&
1943 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1944 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
1945 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1946 else if (head_need || tail_need)
1947 I802_DEBUG_INC(local->tx_expand_skb_head);
1951 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1952 wiphy_debug(local->hw.wiphy,
1953 "failed to reallocate TX buffer\n");
1960 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1961 struct sta_info *sta, struct sk_buff *skb,
1964 struct ieee80211_local *local = sdata->local;
1965 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1966 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1968 enum ieee80211_encrypt encrypt;
1970 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)
1971 encrypt = ENCRYPT_NO;
1972 else if (ieee80211_is_mgmt(hdr->frame_control))
1973 encrypt = ENCRYPT_MGMT;
1975 encrypt = ENCRYPT_DATA;
1977 headroom = local->tx_headroom;
1978 if (encrypt != ENCRYPT_NO)
1979 headroom += sdata->encrypt_headroom;
1980 headroom -= skb_headroom(skb);
1981 headroom = max_t(int, 0, headroom);
1983 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) {
1984 ieee80211_free_txskb(&local->hw, skb);
1988 /* reload after potential resize */
1989 hdr = (struct ieee80211_hdr *) skb->data;
1990 info->control.vif = &sdata->vif;
1992 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1993 if (ieee80211_is_data(hdr->frame_control) &&
1994 is_unicast_ether_addr(hdr->addr1)) {
1995 if (mesh_nexthop_resolve(sdata, skb))
1996 return; /* skb queued: don't free */
1998 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2002 ieee80211_set_qos_hdr(sdata, skb);
2003 ieee80211_tx(sdata, sta, skb, false, txdata_flags);
2006 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
2007 struct sk_buff *skb)
2009 struct ieee80211_radiotap_iterator iterator;
2010 struct ieee80211_radiotap_header *rthdr =
2011 (struct ieee80211_radiotap_header *) skb->data;
2012 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2013 struct ieee80211_supported_band *sband =
2014 local->hw.wiphy->bands[info->band];
2015 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2019 bool rate_found = false;
2020 u8 rate_retries = 0;
2022 u8 mcs_known, mcs_flags, mcs_bw;
2024 u8 vht_mcs = 0, vht_nss = 0;
2027 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2028 IEEE80211_TX_CTL_DONTFRAG;
2031 * for every radiotap entry that is present
2032 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2033 * entries present, or -EINVAL on error)
2037 ret = ieee80211_radiotap_iterator_next(&iterator);
2042 /* see if this argument is something we can use */
2043 switch (iterator.this_arg_index) {
2045 * You must take care when dereferencing iterator.this_arg
2046 * for multibyte types... the pointer is not aligned. Use
2047 * get_unaligned((type *)iterator.this_arg) to dereference
2048 * iterator.this_arg for type "type" safely on all arches.
2050 case IEEE80211_RADIOTAP_FLAGS:
2051 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2053 * this indicates that the skb we have been
2054 * handed has the 32-bit FCS CRC at the end...
2055 * we should react to that by snipping it off
2056 * because it will be recomputed and added
2059 if (skb->len < (iterator._max_length + FCS_LEN))
2062 skb_trim(skb, skb->len - FCS_LEN);
2064 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2065 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2066 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2067 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2070 case IEEE80211_RADIOTAP_TX_FLAGS:
2071 txflags = get_unaligned_le16(iterator.this_arg);
2072 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2073 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2076 case IEEE80211_RADIOTAP_RATE:
2077 rate = *iterator.this_arg;
2082 case IEEE80211_RADIOTAP_DATA_RETRIES:
2083 rate_retries = *iterator.this_arg;
2086 case IEEE80211_RADIOTAP_MCS:
2087 mcs_known = iterator.this_arg[0];
2088 mcs_flags = iterator.this_arg[1];
2089 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2093 rate = iterator.this_arg[2];
2094 rate_flags = IEEE80211_TX_RC_MCS;
2096 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2097 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2098 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2100 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2101 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2102 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2103 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2106 case IEEE80211_RADIOTAP_VHT:
2107 vht_known = get_unaligned_le16(iterator.this_arg);
2110 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2111 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2112 (iterator.this_arg[2] &
2113 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2114 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2116 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2117 if (iterator.this_arg[3] == 1)
2119 IEEE80211_TX_RC_40_MHZ_WIDTH;
2120 else if (iterator.this_arg[3] == 4)
2122 IEEE80211_TX_RC_80_MHZ_WIDTH;
2123 else if (iterator.this_arg[3] == 11)
2125 IEEE80211_TX_RC_160_MHZ_WIDTH;
2128 vht_mcs = iterator.this_arg[4] >> 4;
2131 vht_nss = iterator.this_arg[4] & 0xF;
2132 if (!vht_nss || vht_nss > 8)
2137 * Please update the file
2138 * Documentation/networking/mac80211-injection.txt
2139 * when parsing new fields here.
2147 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2151 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2153 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2154 info->control.rates[i].idx = -1;
2155 info->control.rates[i].flags = 0;
2156 info->control.rates[i].count = 0;
2159 if (rate_flags & IEEE80211_TX_RC_MCS) {
2160 info->control.rates[0].idx = rate;
2161 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2162 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2165 for (i = 0; i < sband->n_bitrates; i++) {
2166 if (rate * 5 != sband->bitrates[i].bitrate)
2169 info->control.rates[0].idx = i;
2174 if (info->control.rates[0].idx < 0)
2175 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2177 info->control.rates[0].flags = rate_flags;
2178 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2179 local->hw.max_rate_tries);
2183 * remove the radiotap header
2184 * iterator->_max_length was sanity-checked against
2185 * skb->len by iterator init
2187 skb_pull(skb, iterator._max_length);
2192 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2193 struct net_device *dev)
2195 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2196 struct ieee80211_chanctx_conf *chanctx_conf;
2197 struct ieee80211_radiotap_header *prthdr =
2198 (struct ieee80211_radiotap_header *)skb->data;
2199 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2200 struct ieee80211_hdr *hdr;
2201 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2202 struct cfg80211_chan_def *chandef;
2206 /* check for not even having the fixed radiotap header part */
2207 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2208 goto fail; /* too short to be possibly valid */
2210 /* is it a header version we can trust to find length from? */
2211 if (unlikely(prthdr->it_version))
2212 goto fail; /* only version 0 is supported */
2214 /* then there must be a radiotap header with a length we can use */
2215 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2217 /* does the skb contain enough to deliver on the alleged length? */
2218 if (unlikely(skb->len < len_rthdr))
2219 goto fail; /* skb too short for claimed rt header extent */
2222 * fix up the pointers accounting for the radiotap
2223 * header still being in there. We are being given
2224 * a precooked IEEE80211 header so no need for
2227 skb_set_mac_header(skb, len_rthdr);
2229 * these are just fixed to the end of the rt area since we
2230 * don't have any better information and at this point, nobody cares
2232 skb_set_network_header(skb, len_rthdr);
2233 skb_set_transport_header(skb, len_rthdr);
2235 if (skb->len < len_rthdr + 2)
2238 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2239 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2241 if (skb->len < len_rthdr + hdrlen)
2245 * Initialize skb->protocol if the injected frame is a data frame
2246 * carrying a rfc1042 header
2248 if (ieee80211_is_data(hdr->frame_control) &&
2249 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2250 u8 *payload = (u8 *)hdr + hdrlen;
2252 if (ether_addr_equal(payload, rfc1042_header))
2253 skb->protocol = cpu_to_be16((payload[6] << 8) |
2257 memset(info, 0, sizeof(*info));
2259 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2260 IEEE80211_TX_CTL_INJECTED;
2265 * We process outgoing injected frames that have a local address
2266 * we handle as though they are non-injected frames.
2267 * This code here isn't entirely correct, the local MAC address
2268 * isn't always enough to find the interface to use; for proper
2269 * VLAN/WDS support we will need a different mechanism (which
2270 * likely isn't going to be monitor interfaces).
2272 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2274 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2275 if (!ieee80211_sdata_running(tmp_sdata))
2277 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2278 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2279 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2281 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2287 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2288 if (!chanctx_conf) {
2289 tmp_sdata = rcu_dereference(local->monitor_sdata);
2292 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2296 chandef = &chanctx_conf->def;
2297 else if (!local->use_chanctx)
2298 chandef = &local->_oper_chandef;
2303 * Frame injection is not allowed if beaconing is not allowed
2304 * or if we need radar detection. Beaconing is usually not allowed when
2305 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2306 * Passive scan is also used in world regulatory domains where
2307 * your country is not known and as such it should be treated as
2308 * NO TX unless the channel is explicitly allowed in which case
2309 * your current regulatory domain would not have the passive scan
2312 * Since AP mode uses monitor interfaces to inject/TX management
2313 * frames we can make AP mode the exception to this rule once it
2314 * supports radar detection as its implementation can deal with
2315 * radar detection by itself. We can do that later by adding a
2316 * monitor flag interfaces used for AP support.
2318 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2322 info->band = chandef->chan->band;
2324 /* process and remove the injection radiotap header */
2325 if (!ieee80211_parse_tx_radiotap(local, skb))
2328 ieee80211_xmit(sdata, NULL, skb, 0);
2331 return NETDEV_TX_OK;
2337 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2340 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2342 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2344 return ethertype == ETH_P_TDLS &&
2346 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2349 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2350 struct sk_buff *skb,
2351 struct sta_info **sta_out)
2353 struct sta_info *sta;
2355 switch (sdata->vif.type) {
2356 case NL80211_IFTYPE_AP_VLAN:
2357 sta = rcu_dereference(sdata->u.vlan.sta);
2361 } else if (sdata->wdev.use_4addr) {
2365 case NL80211_IFTYPE_AP:
2366 case NL80211_IFTYPE_OCB:
2367 case NL80211_IFTYPE_ADHOC:
2368 if (is_multicast_ether_addr(skb->data)) {
2369 *sta_out = ERR_PTR(-ENOENT);
2372 sta = sta_info_get_bss(sdata, skb->data);
2374 case NL80211_IFTYPE_WDS:
2375 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2377 #ifdef CONFIG_MAC80211_MESH
2378 case NL80211_IFTYPE_MESH_POINT:
2379 /* determined much later */
2383 case NL80211_IFTYPE_STATION:
2384 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2385 sta = sta_info_get(sdata, skb->data);
2386 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2387 if (test_sta_flag(sta,
2388 WLAN_STA_TDLS_PEER_AUTH)) {
2394 * TDLS link during setup - throw out frames to
2395 * peer. Allow TDLS-setup frames to unauthorized
2396 * peers for the special case of a link teardown
2397 * after a TDLS sta is removed due to being
2400 if (!ieee80211_is_tdls_setup(skb))
2406 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2414 *sta_out = sta ?: ERR_PTR(-ENOENT);
2419 * ieee80211_build_hdr - build 802.11 header in the given frame
2420 * @sdata: virtual interface to build the header for
2421 * @skb: the skb to build the header in
2422 * @info_flags: skb flags to set
2423 * @ctrl_flags: info control flags to set
2425 * This function takes the skb with 802.3 header and reformats the header to
2426 * the appropriate IEEE 802.11 header based on which interface the packet is
2427 * being transmitted on.
2429 * Note that this function also takes care of the TX status request and
2430 * potential unsharing of the SKB - this needs to be interleaved with the
2433 * The function requires the read-side RCU lock held
2435 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2437 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2438 struct sk_buff *skb, u32 info_flags,
2439 struct sta_info *sta, u32 ctrl_flags)
2441 struct ieee80211_local *local = sdata->local;
2442 struct ieee80211_tx_info *info;
2444 u16 ethertype, hdrlen, meshhdrlen = 0;
2446 struct ieee80211_hdr hdr;
2447 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2448 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2449 const u8 *encaps_data;
2450 int encaps_len, skip_header_bytes;
2451 bool wme_sta = false, authorized = false;
2455 struct ieee80211_chanctx_conf *chanctx_conf;
2456 struct ieee80211_sub_if_data *ap_sdata;
2457 enum nl80211_band band;
2463 /* convert Ethernet header to proper 802.11 header (based on
2464 * operation mode) */
2465 ethertype = (skb->data[12] << 8) | skb->data[13];
2466 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2468 switch (sdata->vif.type) {
2469 case NL80211_IFTYPE_AP_VLAN:
2470 if (sdata->wdev.use_4addr) {
2471 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2473 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2474 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2475 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2476 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2478 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2479 wme_sta = sta->sta.wme;
2481 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2483 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2484 if (!chanctx_conf) {
2488 band = chanctx_conf->def.chan->band;
2489 if (sdata->wdev.use_4addr)
2492 case NL80211_IFTYPE_AP:
2493 if (sdata->vif.type == NL80211_IFTYPE_AP)
2494 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2495 if (!chanctx_conf) {
2499 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2501 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2502 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2503 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2505 band = chanctx_conf->def.chan->band;
2507 case NL80211_IFTYPE_WDS:
2508 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2510 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2511 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2512 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2513 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2516 * This is the exception! WDS style interfaces are prohibited
2517 * when channel contexts are in used so this must be valid
2519 band = local->hw.conf.chandef.chan->band;
2521 #ifdef CONFIG_MAC80211_MESH
2522 case NL80211_IFTYPE_MESH_POINT:
2523 if (!is_multicast_ether_addr(skb->data)) {
2524 struct sta_info *next_hop;
2525 bool mpp_lookup = true;
2527 mpath = mesh_path_lookup(sdata, skb->data);
2530 next_hop = rcu_dereference(mpath->next_hop);
2532 !(mpath->flags & (MESH_PATH_ACTIVE |
2533 MESH_PATH_RESOLVING)))
2538 mppath = mpp_path_lookup(sdata, skb->data);
2540 mppath->exp_time = jiffies;
2543 if (mppath && mpath)
2544 mesh_path_del(sdata, mpath->dst);
2548 * Use address extension if it is a packet from
2549 * another interface or if we know the destination
2550 * is being proxied by a portal (i.e. portal address
2551 * differs from proxied address)
2553 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2554 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2555 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2556 skb->data, skb->data + ETH_ALEN);
2557 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2560 /* DS -> MBSS (802.11-2012 13.11.3.3).
2561 * For unicast with unknown forwarding information,
2562 * destination might be in the MBSS or if that fails
2563 * forwarded to another mesh gate. In either case
2564 * resolution will be handled in ieee80211_xmit(), so
2565 * leave the original DA. This also works for mcast */
2566 const u8 *mesh_da = skb->data;
2569 mesh_da = mppath->mpp;
2571 mesh_da = mpath->dst;
2573 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2574 mesh_da, sdata->vif.addr);
2575 if (is_multicast_ether_addr(mesh_da))
2576 /* DA TA mSA AE:SA */
2577 meshhdrlen = ieee80211_new_mesh_header(
2579 skb->data + ETH_ALEN, NULL);
2581 /* RA TA mDA mSA AE:DA SA */
2582 meshhdrlen = ieee80211_new_mesh_header(
2583 sdata, &mesh_hdr, skb->data,
2584 skb->data + ETH_ALEN);
2587 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2588 if (!chanctx_conf) {
2592 band = chanctx_conf->def.chan->band;
2595 case NL80211_IFTYPE_STATION:
2596 /* we already did checks when looking up the RA STA */
2597 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2601 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2602 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2603 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2605 } else if (sdata->u.mgd.use_4addr &&
2606 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2607 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2608 IEEE80211_FCTL_TODS);
2610 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2611 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2612 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2613 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2616 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2618 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2619 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2620 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2623 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2624 if (!chanctx_conf) {
2628 band = chanctx_conf->def.chan->band;
2630 case NL80211_IFTYPE_OCB:
2632 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2633 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2634 eth_broadcast_addr(hdr.addr3);
2636 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2637 if (!chanctx_conf) {
2641 band = chanctx_conf->def.chan->band;
2643 case NL80211_IFTYPE_ADHOC:
2645 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2646 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2647 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2649 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2650 if (!chanctx_conf) {
2654 band = chanctx_conf->def.chan->band;
2661 multicast = is_multicast_ether_addr(hdr.addr1);
2663 /* sta is always NULL for mesh */
2665 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2666 wme_sta = sta->sta.wme;
2667 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2668 /* For mesh, the use of the QoS header is mandatory */
2672 /* receiver does QoS (which also means we do) use it */
2674 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2679 * Drop unicast frames to unauthorised stations unless they are
2680 * EAPOL frames from the local station.
2682 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2683 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2684 !multicast && !authorized &&
2685 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2686 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2687 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2688 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2689 sdata->name, hdr.addr1);
2692 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2698 if (unlikely(!multicast && skb->sk &&
2699 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2700 struct sk_buff *ack_skb = skb_clone_sk(skb);
2703 unsigned long flags;
2706 spin_lock_irqsave(&local->ack_status_lock, flags);
2707 id = idr_alloc(&local->ack_status_frames, ack_skb,
2708 1, 0x10000, GFP_ATOMIC);
2709 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2713 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2721 * If the skb is shared we need to obtain our own copy.
2723 if (skb_shared(skb)) {
2724 struct sk_buff *tmp_skb = skb;
2726 /* can't happen -- skb is a clone if info_id != 0 */
2729 skb = skb_clone(skb, GFP_ATOMIC);
2738 hdr.frame_control = fc;
2739 hdr.duration_id = 0;
2742 skip_header_bytes = ETH_HLEN;
2743 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2744 encaps_data = bridge_tunnel_header;
2745 encaps_len = sizeof(bridge_tunnel_header);
2746 skip_header_bytes -= 2;
2747 } else if (ethertype >= ETH_P_802_3_MIN) {
2748 encaps_data = rfc1042_header;
2749 encaps_len = sizeof(rfc1042_header);
2750 skip_header_bytes -= 2;
2756 skb_pull(skb, skip_header_bytes);
2757 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2760 * So we need to modify the skb header and hence need a copy of
2761 * that. The head_need variable above doesn't, so far, include
2762 * the needed header space that we don't need right away. If we
2763 * can, then we don't reallocate right now but only after the
2764 * frame arrives at the master device (if it does...)
2766 * If we cannot, however, then we will reallocate to include all
2767 * the ever needed space. Also, if we need to reallocate it anyway,
2768 * make it big enough for everything we may ever need.
2771 if (head_need > 0 || skb_cloned(skb)) {
2772 head_need += sdata->encrypt_headroom;
2773 head_need += local->tx_headroom;
2774 head_need = max_t(int, 0, head_need);
2775 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) {
2776 ieee80211_free_txskb(&local->hw, skb);
2778 return ERR_PTR(-ENOMEM);
2783 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2785 #ifdef CONFIG_MAC80211_MESH
2787 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2790 if (ieee80211_is_data_qos(fc)) {
2791 __le16 *qos_control;
2793 qos_control = skb_push(skb, 2);
2794 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2796 * Maybe we could actually set some fields here, for now just
2797 * initialise to zero to indicate no special operation.
2801 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2803 skb_reset_mac_header(skb);
2805 info = IEEE80211_SKB_CB(skb);
2806 memset(info, 0, sizeof(*info));
2808 info->flags = info_flags;
2809 info->ack_frame_id = info_id;
2811 info->control.flags = ctrl_flags;
2816 return ERR_PTR(ret);
2820 * fast-xmit overview
2822 * The core idea of this fast-xmit is to remove per-packet checks by checking
2823 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2824 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2825 * much less work can be done per packet. For example, fragmentation must be
2826 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2829 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2830 * header and other data to aid packet processing in ieee80211_xmit_fast().
2832 * The most difficult part of this is that when any of these assumptions
2833 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2834 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2835 * since the per-packet code no longer checks the conditions. This is reflected
2836 * by the calls to these functions throughout the rest of the code, and must be
2837 * maintained if any of the TX path checks change.
2840 void ieee80211_check_fast_xmit(struct sta_info *sta)
2842 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2843 struct ieee80211_local *local = sta->local;
2844 struct ieee80211_sub_if_data *sdata = sta->sdata;
2845 struct ieee80211_hdr *hdr = (void *)build.hdr;
2846 struct ieee80211_chanctx_conf *chanctx_conf;
2849 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2852 /* Locking here protects both the pointer itself, and against concurrent
2853 * invocations winning data access races to, e.g., the key pointer that
2855 * Without it, the invocation of this function right after the key
2856 * pointer changes wouldn't be sufficient, as another CPU could access
2857 * the pointer, then stall, and then do the cache update after the CPU
2858 * that invalidated the key.
2859 * With the locking, such scenarios cannot happen as the check for the
2860 * key and the fast-tx assignment are done atomically, so the CPU that
2861 * modifies the key will either wait or other one will see the key
2862 * cleared/changed already.
2864 spin_lock_bh(&sta->lock);
2865 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2866 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2867 sdata->vif.type == NL80211_IFTYPE_STATION)
2870 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2873 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2874 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2875 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2876 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2879 if (sdata->noack_map)
2882 /* fast-xmit doesn't handle fragmentation at all */
2883 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2884 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2888 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2889 if (!chanctx_conf) {
2893 build.band = chanctx_conf->def.chan->band;
2896 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2898 switch (sdata->vif.type) {
2899 case NL80211_IFTYPE_ADHOC:
2901 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2902 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2903 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2906 case NL80211_IFTYPE_STATION:
2907 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2909 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2910 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2911 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2916 if (sdata->u.mgd.use_4addr) {
2917 /* non-regular ethertype cannot use the fastpath */
2918 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2919 IEEE80211_FCTL_TODS);
2921 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2922 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2923 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2924 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2928 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2930 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2931 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2932 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2935 case NL80211_IFTYPE_AP_VLAN:
2936 if (sdata->wdev.use_4addr) {
2937 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2938 IEEE80211_FCTL_TODS);
2940 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2941 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2942 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2943 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2948 case NL80211_IFTYPE_AP:
2949 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2951 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2952 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2953 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2957 /* not handled on fast-xmit */
2963 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2966 /* We store the key here so there's no point in using rcu_dereference()
2967 * but that's fine because the code that changes the pointers will call
2968 * this function after doing so. For a single CPU that would be enough,
2969 * for multiple see the comment above.
2971 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2973 build.key = rcu_access_pointer(sdata->default_unicast_key);
2975 bool gen_iv, iv_spc, mmic;
2977 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2978 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2979 mmic = build.key->conf.flags &
2980 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
2981 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
2983 /* don't handle software crypto */
2984 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2987 switch (build.key->conf.cipher) {
2988 case WLAN_CIPHER_SUITE_CCMP:
2989 case WLAN_CIPHER_SUITE_CCMP_256:
2990 /* add fixed key ID */
2992 (build.hdr + build.hdr_len)[3] =
2993 0x20 | (build.key->conf.keyidx << 6);
2994 build.pn_offs = build.hdr_len;
2996 if (gen_iv || iv_spc)
2997 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2999 case WLAN_CIPHER_SUITE_GCMP:
3000 case WLAN_CIPHER_SUITE_GCMP_256:
3001 /* add fixed key ID */
3003 (build.hdr + build.hdr_len)[3] =
3004 0x20 | (build.key->conf.keyidx << 6);
3005 build.pn_offs = build.hdr_len;
3007 if (gen_iv || iv_spc)
3008 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3010 case WLAN_CIPHER_SUITE_TKIP:
3011 /* cannot handle MMIC or IV generation in xmit-fast */
3015 build.hdr_len += IEEE80211_TKIP_IV_LEN;
3017 case WLAN_CIPHER_SUITE_WEP40:
3018 case WLAN_CIPHER_SUITE_WEP104:
3019 /* cannot handle IV generation in fast-xmit */
3023 build.hdr_len += IEEE80211_WEP_IV_LEN;
3025 case WLAN_CIPHER_SUITE_AES_CMAC:
3026 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3027 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3028 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3030 "management cipher suite 0x%x enabled for data\n",
3031 build.key->conf.cipher);
3034 /* we don't know how to generate IVs for this at all */
3035 if (WARN_ON(gen_iv))
3037 /* pure hardware keys are OK, of course */
3038 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
3040 /* cipher scheme might require space allocation */
3042 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
3045 build.hdr_len += build.key->conf.iv_len;
3048 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3051 hdr->frame_control = fc;
3053 memcpy(build.hdr + build.hdr_len,
3054 rfc1042_header, sizeof(rfc1042_header));
3055 build.hdr_len += sizeof(rfc1042_header);
3057 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3058 /* if the kmemdup fails, continue w/o fast_tx */
3063 /* we might have raced against another call to this function */
3064 old = rcu_dereference_protected(sta->fast_tx,
3065 lockdep_is_held(&sta->lock));
3066 rcu_assign_pointer(sta->fast_tx, fast_tx);
3068 kfree_rcu(old, rcu_head);
3069 spin_unlock_bh(&sta->lock);
3072 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3074 struct sta_info *sta;
3077 list_for_each_entry_rcu(sta, &local->sta_list, list)
3078 ieee80211_check_fast_xmit(sta);
3082 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3084 struct ieee80211_local *local = sdata->local;
3085 struct sta_info *sta;
3089 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3090 if (sdata != sta->sdata &&
3091 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3093 ieee80211_check_fast_xmit(sta);
3099 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3101 struct ieee80211_fast_tx *fast_tx;
3103 spin_lock_bh(&sta->lock);
3104 fast_tx = rcu_dereference_protected(sta->fast_tx,
3105 lockdep_is_held(&sta->lock));
3106 RCU_INIT_POINTER(sta->fast_tx, NULL);
3107 spin_unlock_bh(&sta->lock);
3110 kfree_rcu(fast_tx, rcu_head);
3113 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3114 struct sk_buff *skb, int headroom)
3116 if (skb_headroom(skb) < headroom) {
3117 I802_DEBUG_INC(local->tx_expand_skb_head);
3119 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3120 wiphy_debug(local->hw.wiphy,
3121 "failed to reallocate TX buffer\n");
3129 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3130 struct ieee80211_fast_tx *fast_tx,
3131 struct sk_buff *skb)
3133 struct ieee80211_local *local = sdata->local;
3134 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3135 struct ieee80211_hdr *hdr;
3136 struct ethhdr *amsdu_hdr;
3137 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3138 int subframe_len = skb->len - hdr_len;
3140 u8 *qc, *h_80211_src, *h_80211_dst;
3143 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3146 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3149 if (!ieee80211_amsdu_realloc_pad(local, skb,
3150 sizeof(*amsdu_hdr) +
3151 local->hw.extra_tx_headroom))
3154 data = skb_push(skb, sizeof(*amsdu_hdr));
3155 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3157 amsdu_hdr = data + hdr_len;
3158 /* h_80211_src/dst is addr* field within hdr */
3159 h_80211_src = data + fast_tx->sa_offs;
3160 h_80211_dst = data + fast_tx->da_offs;
3162 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3163 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3164 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3166 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3167 * fields needs to be changed to BSSID for A-MSDU frames depending
3168 * on FromDS/ToDS values.
3170 switch (sdata->vif.type) {
3171 case NL80211_IFTYPE_STATION:
3172 bssid = sdata->u.mgd.bssid;
3174 case NL80211_IFTYPE_AP:
3175 case NL80211_IFTYPE_AP_VLAN:
3176 bssid = sdata->vif.addr;
3182 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3183 ether_addr_copy(h_80211_src, bssid);
3185 if (bssid && ieee80211_has_tods(hdr->frame_control))
3186 ether_addr_copy(h_80211_dst, bssid);
3188 qc = ieee80211_get_qos_ctl(hdr);
3189 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3191 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3196 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3197 struct sta_info *sta,
3198 struct ieee80211_fast_tx *fast_tx,
3199 struct sk_buff *skb)
3201 struct ieee80211_local *local = sdata->local;
3202 struct fq *fq = &local->fq;
3204 struct fq_flow *flow;
3205 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3206 struct ieee80211_txq *txq = sta->sta.txq[tid];
3207 struct txq_info *txqi;
3208 struct sk_buff **frag_tail, *head;
3209 int subframe_len = skb->len - ETH_ALEN;
3210 u8 max_subframes = sta->sta.max_amsdu_subframes;
3211 int max_frags = local->hw.max_tx_fragments;
3212 int max_amsdu_len = sta->sta.max_amsdu_len;
3217 unsigned int orig_len;
3218 int n = 2, nfrags, pad = 0;
3221 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3227 txqi = to_txq_info(txq);
3228 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3231 if (sta->sta.max_rc_amsdu_len)
3232 max_amsdu_len = min_t(int, max_amsdu_len,
3233 sta->sta.max_rc_amsdu_len);
3235 spin_lock_bh(&fq->lock);
3237 /* TODO: Ideally aggregation should be done on dequeue to remain
3238 * responsive to environment changes.
3242 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3243 head = skb_peek_tail(&flow->queue);
3247 orig_truesize = head->truesize;
3248 orig_len = head->len;
3250 if (skb->len + head->len > max_amsdu_len)
3253 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3254 nfrags += 1 + skb_shinfo(head)->nr_frags;
3255 frag_tail = &skb_shinfo(head)->frag_list;
3256 while (*frag_tail) {
3257 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3258 frag_tail = &(*frag_tail)->next;
3262 if (max_subframes && n > max_subframes)
3265 if (max_frags && nfrags > max_frags)
3268 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3271 /* If n == 2, the "while (*frag_tail)" loop above didn't execute
3272 * and frag_tail should be &skb_shinfo(head)->frag_list.
3273 * However, ieee80211_amsdu_prepare_head() can reallocate it.
3274 * Reload frag_tail to have it pointing to the correct place.
3277 frag_tail = &skb_shinfo(head)->frag_list;
3280 * Pad out the previous subframe to a multiple of 4 by adding the
3281 * padding to the next one, that's being added. Note that head->len
3282 * is the length of the full A-MSDU, but that works since each time
3283 * we add a new subframe we pad out the previous one to a multiple
3284 * of 4 and thus it no longer matters in the next round.
3286 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3287 if ((head->len - hdrlen) & 3)
3288 pad = 4 - ((head->len - hdrlen) & 3);
3290 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3295 data = skb_push(skb, ETH_ALEN + 2);
3296 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3298 data += 2 * ETH_ALEN;
3299 len = cpu_to_be16(subframe_len);
3300 memcpy(data, &len, 2);
3301 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3303 memset(skb_push(skb, pad), 0, pad);
3305 head->len += skb->len;
3306 head->data_len += skb->len;
3310 fq->memory_usage += head->truesize - orig_truesize;
3311 if (head->len != orig_len) {
3312 flow->backlog += head->len - orig_len;
3313 tin->backlog_bytes += head->len - orig_len;
3315 fq_recalc_backlog(fq, tin, flow);
3318 spin_unlock_bh(&fq->lock);
3324 * Can be called while the sta lock is held. Anything that can cause packets to
3325 * be generated will cause deadlock!
3327 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3328 struct sta_info *sta, u8 pn_offs,
3329 struct ieee80211_key *key,
3330 struct sk_buff *skb)
3332 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3333 struct ieee80211_hdr *hdr = (void *)skb->data;
3334 u8 tid = IEEE80211_NUM_TIDS;
3337 info->control.hw_key = &key->conf;
3339 ieee80211_tx_stats(skb->dev, skb->len);
3341 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3342 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3343 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3345 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3346 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3347 sdata->sequence_number += 0x10;
3350 if (skb_shinfo(skb)->gso_size)
3351 sta->tx_stats.msdu[tid] +=
3352 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3354 sta->tx_stats.msdu[tid]++;
3356 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3358 /* statistics normally done by ieee80211_tx_h_stats (but that
3359 * has to consider fragmentation, so is more complex)
3361 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3362 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3366 u8 *crypto_hdr = skb->data + pn_offs;
3368 switch (key->conf.cipher) {
3369 case WLAN_CIPHER_SUITE_CCMP:
3370 case WLAN_CIPHER_SUITE_CCMP_256:
3371 case WLAN_CIPHER_SUITE_GCMP:
3372 case WLAN_CIPHER_SUITE_GCMP_256:
3373 pn = atomic64_inc_return(&key->conf.tx_pn);
3375 crypto_hdr[1] = pn >> 8;
3376 crypto_hdr[4] = pn >> 16;
3377 crypto_hdr[5] = pn >> 24;
3378 crypto_hdr[6] = pn >> 32;
3379 crypto_hdr[7] = pn >> 40;
3385 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3386 struct sta_info *sta,
3387 struct ieee80211_fast_tx *fast_tx,
3388 struct sk_buff *skb)
3390 struct ieee80211_local *local = sdata->local;
3391 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3392 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3393 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3395 struct ieee80211_tx_info *info;
3396 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3397 struct ieee80211_tx_data tx;
3398 ieee80211_tx_result r;
3399 struct tid_ampdu_tx *tid_tx = NULL;
3400 u8 tid = IEEE80211_NUM_TIDS;
3402 /* control port protocol needs a lot of special handling */
3403 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3406 /* only RFC 1042 SNAP */
3407 if (ethertype < ETH_P_802_3_MIN)
3410 /* don't handle TX status request here either */
3411 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3414 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3415 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3416 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3418 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3420 if (tid_tx->timeout)
3421 tid_tx->last_tx = jiffies;
3425 /* after this point (skb is modified) we cannot return false */
3427 if (skb_shared(skb)) {
3428 struct sk_buff *tmp_skb = skb;
3430 skb = skb_clone(skb, GFP_ATOMIC);
3437 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3438 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3441 /* will not be crypto-handled beyond what we do here, so use false
3442 * as the may-encrypt argument for the resize to not account for
3443 * more room than we already have in 'extra_head'
3445 if (unlikely(ieee80211_skb_resize(sdata, skb,
3446 max_t(int, extra_head + hw_headroom -
3447 skb_headroom(skb), 0),
3453 memcpy(ð, skb->data, ETH_HLEN - 2);
3454 hdr = skb_push(skb, extra_head);
3455 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3456 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3457 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3459 info = IEEE80211_SKB_CB(skb);
3460 memset(info, 0, sizeof(*info));
3461 info->band = fast_tx->band;
3462 info->control.vif = &sdata->vif;
3463 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3464 IEEE80211_TX_CTL_DONTFRAG |
3465 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3466 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3468 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3469 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3470 *ieee80211_get_qos_ctl(hdr) = tid;
3473 __skb_queue_head_init(&tx.skbs);
3475 tx.flags = IEEE80211_TX_UNICAST;
3479 tx.key = fast_tx->key;
3481 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3483 r = ieee80211_tx_h_rate_ctrl(&tx);
3487 if (r != TX_CONTINUE) {
3494 if (ieee80211_queue_skb(local, sdata, sta, skb))
3497 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3500 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3501 sdata = container_of(sdata->bss,
3502 struct ieee80211_sub_if_data, u.ap);
3504 __skb_queue_tail(&tx.skbs, skb);
3505 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3509 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3510 struct ieee80211_txq *txq)
3512 struct ieee80211_local *local = hw_to_local(hw);
3513 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3514 struct ieee80211_hdr *hdr;
3515 struct sk_buff *skb = NULL;
3516 struct fq *fq = &local->fq;
3517 struct fq_tin *tin = &txqi->tin;
3518 struct ieee80211_tx_info *info;
3519 struct ieee80211_tx_data tx;
3520 ieee80211_tx_result r;
3521 struct ieee80211_vif *vif;
3523 spin_lock_bh(&fq->lock);
3525 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
3528 /* Make sure fragments stay together. */
3529 skb = __skb_dequeue(&txqi->frags);
3534 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3538 hdr = (struct ieee80211_hdr *)skb->data;
3539 info = IEEE80211_SKB_CB(skb);
3541 memset(&tx, 0, sizeof(tx));
3542 __skb_queue_head_init(&tx.skbs);
3545 tx.sdata = vif_to_sdata(info->control.vif);
3548 tx.sta = container_of(txq->sta, struct sta_info, sta);
3550 * Drop unicast frames to unauthorised stations unless they are
3551 * EAPOL frames from the local station.
3553 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
3554 !ieee80211_vif_is_mesh(&tx.sdata->vif) &&
3555 tx.sdata->vif.type != NL80211_IFTYPE_OCB &&
3556 !is_multicast_ether_addr(hdr->addr1) &&
3557 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) &&
3558 (!(info->control.flags &
3559 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) ||
3560 !ether_addr_equal(tx.sdata->vif.addr,
3562 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
3563 ieee80211_free_txskb(&local->hw, skb);
3569 * The key can be removed while the packet was queued, so need to call
3570 * this here to get the current key.
3572 r = ieee80211_tx_h_select_key(&tx);
3573 if (r != TX_CONTINUE) {
3574 ieee80211_free_txskb(&local->hw, skb);
3578 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3579 info->flags |= IEEE80211_TX_CTL_AMPDU;
3581 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3583 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3584 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3589 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3590 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3592 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3595 if (invoke_tx_handlers_late(&tx))
3598 skb = __skb_dequeue(&tx.skbs);
3600 if (!skb_queue_empty(&tx.skbs))
3601 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3604 if (skb && skb_has_frag_list(skb) &&
3605 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3606 if (skb_linearize(skb)) {
3607 ieee80211_free_txskb(&local->hw, skb);
3612 switch (tx.sdata->vif.type) {
3613 case NL80211_IFTYPE_MONITOR:
3614 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3615 vif = &tx.sdata->vif;
3618 tx.sdata = rcu_dereference(local->monitor_sdata);
3620 vif = &tx.sdata->vif;
3622 vif->hw_queue[skb_get_queue_mapping(skb)];
3623 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3624 ieee80211_free_txskb(&local->hw, skb);
3630 case NL80211_IFTYPE_AP_VLAN:
3631 tx.sdata = container_of(tx.sdata->bss,
3632 struct ieee80211_sub_if_data, u.ap);
3635 vif = &tx.sdata->vif;
3639 IEEE80211_SKB_CB(skb)->control.vif = vif;
3641 spin_unlock_bh(&fq->lock);
3645 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3647 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3648 struct net_device *dev,
3652 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3653 struct sta_info *sta;
3654 struct sk_buff *next;
3656 if (unlikely(skb->len < ETH_HLEN)) {
3663 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3666 if (!IS_ERR_OR_NULL(sta)) {
3667 struct ieee80211_fast_tx *fast_tx;
3669 /* We need a bit of data queued to build aggregates properly, so
3670 * instruct the TCP stack to allow more than a single ms of data
3671 * to be queued in the stack. The value is a bit-shift of 1
3672 * second, so 7 is ~8ms of queued data. Only affects local TCP
3675 sk_pacing_shift_update(skb->sk, 7);
3677 fast_tx = rcu_dereference(sta->fast_tx);
3680 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3684 if (skb_is_gso(skb)) {
3685 struct sk_buff *segs;
3687 segs = skb_gso_segment(skb, 0);
3695 /* we cannot process non-linear frames on this path */
3696 if (skb_linearize(skb)) {
3701 /* the frame could be fragmented, software-encrypted, and other
3702 * things so we cannot really handle checksum offload with it -
3703 * fix it up in software before we handle anything else.
3705 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3706 skb_set_transport_header(skb,
3707 skb_checksum_start_offset(skb));
3708 if (skb_checksum_help(skb))
3721 skb = ieee80211_build_hdr(sdata, skb, info_flags,
3726 ieee80211_tx_stats(dev, skb->len);
3728 ieee80211_xmit(sdata, sta, skb, 0);
3737 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3742 err = skb_ensure_writable(skb, ETH_HLEN);
3746 eth = (void *)skb->data;
3747 ether_addr_copy(eth->h_dest, sta->sta.addr);
3752 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3753 struct net_device *dev)
3755 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3756 const struct ethhdr *eth = (void *)skb->data;
3757 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3760 if (likely(!is_multicast_ether_addr(eth->h_dest)))
3763 switch (sdata->vif.type) {
3764 case NL80211_IFTYPE_AP_VLAN:
3765 if (sdata->u.vlan.sta)
3767 if (sdata->wdev.use_4addr)
3770 case NL80211_IFTYPE_AP:
3771 /* check runtime toggle for this bss */
3772 if (!sdata->bss->multicast_to_unicast)
3779 /* multicast to unicast conversion only for some payload */
3780 ethertype = eth->h_proto;
3781 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3782 ethertype = ethvlan->h_vlan_encapsulated_proto;
3783 switch (ethertype) {
3784 case htons(ETH_P_ARP):
3785 case htons(ETH_P_IP):
3786 case htons(ETH_P_IPV6):
3796 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3797 struct sk_buff_head *queue)
3799 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3800 struct ieee80211_local *local = sdata->local;
3801 const struct ethhdr *eth = (struct ethhdr *)skb->data;
3802 struct sta_info *sta, *first = NULL;
3803 struct sk_buff *cloned_skb;
3807 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3808 if (sdata != sta->sdata)
3809 /* AP-VLAN mismatch */
3811 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3812 /* do not send back to source */
3818 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3821 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3822 dev_kfree_skb(cloned_skb);
3825 __skb_queue_tail(queue, cloned_skb);
3828 if (likely(first)) {
3829 if (unlikely(ieee80211_change_da(skb, first)))
3831 __skb_queue_tail(queue, skb);
3833 /* no STA connected, drop */
3840 __skb_queue_purge(queue);
3841 __skb_queue_tail(queue, skb);
3847 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3848 * @skb: packet to be sent
3849 * @dev: incoming interface
3851 * On failure skb will be freed.
3853 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3854 struct net_device *dev)
3856 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
3857 struct sk_buff_head queue;
3859 __skb_queue_head_init(&queue);
3860 ieee80211_convert_to_unicast(skb, dev, &queue);
3861 while ((skb = __skb_dequeue(&queue)))
3862 __ieee80211_subif_start_xmit(skb, dev, 0, 0);
3864 __ieee80211_subif_start_xmit(skb, dev, 0, 0);
3867 return NETDEV_TX_OK;
3871 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3872 struct sk_buff *skb, u32 info_flags)
3874 struct ieee80211_hdr *hdr;
3875 struct ieee80211_tx_data tx = {
3876 .local = sdata->local,
3879 struct sta_info *sta;
3883 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3885 skb = ERR_PTR(-EINVAL);
3889 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0);
3893 hdr = (void *)skb->data;
3894 tx.sta = sta_info_get(sdata, hdr->addr1);
3897 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3900 return ERR_PTR(-EINVAL);
3909 * ieee80211_clear_tx_pending may not be called in a context where
3910 * it is possible that it packets could come in again.
3912 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3914 struct sk_buff *skb;
3917 for (i = 0; i < local->hw.queues; i++) {
3918 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3919 ieee80211_free_txskb(&local->hw, skb);
3924 * Returns false if the frame couldn't be transmitted but was queued instead,
3925 * which in this case means re-queued -- take as an indication to stop sending
3926 * more pending frames.
3928 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3929 struct sk_buff *skb)
3931 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3932 struct ieee80211_sub_if_data *sdata;
3933 struct sta_info *sta;
3934 struct ieee80211_hdr *hdr;
3936 struct ieee80211_chanctx_conf *chanctx_conf;
3938 sdata = vif_to_sdata(info->control.vif);
3940 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3941 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3942 if (unlikely(!chanctx_conf)) {
3946 info->band = chanctx_conf->def.chan->band;
3947 result = ieee80211_tx(sdata, NULL, skb, true, 0);
3949 struct sk_buff_head skbs;
3951 __skb_queue_head_init(&skbs);
3952 __skb_queue_tail(&skbs, skb);
3954 hdr = (struct ieee80211_hdr *)skb->data;
3955 sta = sta_info_get(sdata, hdr->addr1);
3957 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3964 * Transmit all pending packets. Called from tasklet.
3966 void ieee80211_tx_pending(unsigned long data)
3968 struct ieee80211_local *local = (struct ieee80211_local *)data;
3969 unsigned long flags;
3975 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3976 for (i = 0; i < local->hw.queues; i++) {
3978 * If queue is stopped by something other than due to pending
3979 * frames, or we have no pending frames, proceed to next queue.
3981 if (local->queue_stop_reasons[i] ||
3982 skb_queue_empty(&local->pending[i]))
3985 while (!skb_queue_empty(&local->pending[i])) {
3986 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3987 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3989 if (WARN_ON(!info->control.vif)) {
3990 ieee80211_free_txskb(&local->hw, skb);
3994 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3997 txok = ieee80211_tx_pending_skb(local, skb);
3998 spin_lock_irqsave(&local->queue_stop_reason_lock,
4004 if (skb_queue_empty(&local->pending[i]))
4005 ieee80211_propagate_queue_wake(local, i);
4007 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4012 /* functions for drivers to get certain frames */
4014 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4015 struct ps_data *ps, struct sk_buff *skb,
4020 int i, have_bits = 0, n1, n2;
4022 /* Generate bitmap for TIM only if there are any STAs in power save
4024 if (atomic_read(&ps->num_sta_ps) > 0)
4025 /* in the hope that this is faster than
4026 * checking byte-for-byte */
4027 have_bits = !bitmap_empty((unsigned long *)ps->tim,
4028 IEEE80211_MAX_AID+1);
4030 if (ps->dtim_count == 0)
4031 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
4036 tim = pos = skb_put(skb, 6);
4037 *pos++ = WLAN_EID_TIM;
4039 *pos++ = ps->dtim_count;
4040 *pos++ = sdata->vif.bss_conf.dtim_period;
4042 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
4045 ps->dtim_bc_mc = aid0 == 1;
4048 /* Find largest even number N1 so that bits numbered 1 through
4049 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4050 * (N2 + 1) x 8 through 2007 are 0. */
4052 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4059 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4066 /* Bitmap control */
4068 /* Part Virt Bitmap */
4069 skb_put(skb, n2 - n1);
4070 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
4072 tim[1] = n2 - n1 + 4;
4074 *pos++ = aid0; /* Bitmap control */
4075 *pos++ = 0; /* Part Virt Bitmap */
4079 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4080 struct ps_data *ps, struct sk_buff *skb,
4083 struct ieee80211_local *local = sdata->local;
4086 * Not very nice, but we want to allow the driver to call
4087 * ieee80211_beacon_get() as a response to the set_tim()
4088 * callback. That, however, is already invoked under the
4089 * sta_lock to guarantee consistent and race-free update
4090 * of the tim bitmap in mac80211 and the driver.
4092 if (local->tim_in_locked_section) {
4093 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4095 spin_lock_bh(&local->tim_lock);
4096 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4097 spin_unlock_bh(&local->tim_lock);
4103 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
4104 struct beacon_data *beacon)
4106 struct probe_resp *resp;
4108 size_t beacon_data_len;
4110 u8 count = beacon->csa_current_counter;
4112 switch (sdata->vif.type) {
4113 case NL80211_IFTYPE_AP:
4114 beacon_data = beacon->tail;
4115 beacon_data_len = beacon->tail_len;
4117 case NL80211_IFTYPE_ADHOC:
4118 beacon_data = beacon->head;
4119 beacon_data_len = beacon->head_len;
4121 case NL80211_IFTYPE_MESH_POINT:
4122 beacon_data = beacon->head;
4123 beacon_data_len = beacon->head_len;
4130 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
4131 resp = rcu_dereference(sdata->u.ap.probe_resp);
4133 if (beacon->csa_counter_offsets[i]) {
4134 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
4140 beacon_data[beacon->csa_counter_offsets[i]] = count;
4143 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
4144 resp->data[resp->csa_counter_offsets[i]] = count;
4149 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
4151 beacon->csa_current_counter--;
4153 /* the counter should never reach 0 */
4154 WARN_ON_ONCE(!beacon->csa_current_counter);
4156 return beacon->csa_current_counter;
4159 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4161 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4162 struct beacon_data *beacon = NULL;
4167 if (sdata->vif.type == NL80211_IFTYPE_AP)
4168 beacon = rcu_dereference(sdata->u.ap.beacon);
4169 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4170 beacon = rcu_dereference(sdata->u.ibss.presp);
4171 else if (ieee80211_vif_is_mesh(&sdata->vif))
4172 beacon = rcu_dereference(sdata->u.mesh.beacon);
4177 count = __ieee80211_csa_update_counter(beacon);
4183 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4185 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter)
4187 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4188 struct beacon_data *beacon = NULL;
4192 if (sdata->vif.type == NL80211_IFTYPE_AP)
4193 beacon = rcu_dereference(sdata->u.ap.beacon);
4194 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4195 beacon = rcu_dereference(sdata->u.ibss.presp);
4196 else if (ieee80211_vif_is_mesh(&sdata->vif))
4197 beacon = rcu_dereference(sdata->u.mesh.beacon);
4202 if (counter < beacon->csa_current_counter)
4203 beacon->csa_current_counter = counter;
4208 EXPORT_SYMBOL(ieee80211_csa_set_counter);
4210 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4212 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4213 struct beacon_data *beacon = NULL;
4215 size_t beacon_data_len;
4218 if (!ieee80211_sdata_running(sdata))
4222 if (vif->type == NL80211_IFTYPE_AP) {
4223 struct ieee80211_if_ap *ap = &sdata->u.ap;
4225 beacon = rcu_dereference(ap->beacon);
4226 if (WARN_ON(!beacon || !beacon->tail))
4228 beacon_data = beacon->tail;
4229 beacon_data_len = beacon->tail_len;
4230 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4231 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4233 beacon = rcu_dereference(ifibss->presp);
4237 beacon_data = beacon->head;
4238 beacon_data_len = beacon->head_len;
4239 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4240 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4242 beacon = rcu_dereference(ifmsh->beacon);
4246 beacon_data = beacon->head;
4247 beacon_data_len = beacon->head_len;
4253 if (!beacon->csa_counter_offsets[0])
4256 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4259 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4266 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4268 static struct sk_buff *
4269 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4270 struct ieee80211_vif *vif,
4271 struct ieee80211_mutable_offsets *offs,
4274 struct ieee80211_local *local = hw_to_local(hw);
4275 struct beacon_data *beacon = NULL;
4276 struct sk_buff *skb = NULL;
4277 struct ieee80211_tx_info *info;
4278 struct ieee80211_sub_if_data *sdata = NULL;
4279 enum nl80211_band band;
4280 struct ieee80211_tx_rate_control txrc;
4281 struct ieee80211_chanctx_conf *chanctx_conf;
4282 int csa_off_base = 0;
4286 sdata = vif_to_sdata(vif);
4287 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4289 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4293 memset(offs, 0, sizeof(*offs));
4295 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4296 struct ieee80211_if_ap *ap = &sdata->u.ap;
4298 beacon = rcu_dereference(ap->beacon);
4300 if (beacon->csa_counter_offsets[0]) {
4302 __ieee80211_csa_update_counter(beacon);
4304 ieee80211_set_csa(sdata, beacon);
4308 * headroom, head length,
4309 * tail length and maximum TIM length
4311 skb = dev_alloc_skb(local->tx_headroom +
4313 beacon->tail_len + 256 +
4314 local->hw.extra_beacon_tailroom);
4318 skb_reserve(skb, local->tx_headroom);
4319 skb_put_data(skb, beacon->head, beacon->head_len);
4321 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4325 offs->tim_offset = beacon->head_len;
4326 offs->tim_length = skb->len - beacon->head_len;
4328 /* for AP the csa offsets are from tail */
4329 csa_off_base = skb->len;
4333 skb_put_data(skb, beacon->tail,
4337 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4338 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4339 struct ieee80211_hdr *hdr;
4341 beacon = rcu_dereference(ifibss->presp);
4345 if (beacon->csa_counter_offsets[0]) {
4347 __ieee80211_csa_update_counter(beacon);
4349 ieee80211_set_csa(sdata, beacon);
4352 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4353 local->hw.extra_beacon_tailroom);
4356 skb_reserve(skb, local->tx_headroom);
4357 skb_put_data(skb, beacon->head, beacon->head_len);
4359 hdr = (struct ieee80211_hdr *) skb->data;
4360 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4361 IEEE80211_STYPE_BEACON);
4362 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4363 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4365 beacon = rcu_dereference(ifmsh->beacon);
4369 if (beacon->csa_counter_offsets[0]) {
4371 /* TODO: For mesh csa_counter is in TU, so
4372 * decrementing it by one isn't correct, but
4373 * for now we leave it consistent with overall
4374 * mac80211's behavior.
4376 __ieee80211_csa_update_counter(beacon);
4378 ieee80211_set_csa(sdata, beacon);
4381 if (ifmsh->sync_ops)
4382 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4384 skb = dev_alloc_skb(local->tx_headroom +
4388 local->hw.extra_beacon_tailroom);
4391 skb_reserve(skb, local->tx_headroom);
4392 skb_put_data(skb, beacon->head, beacon->head_len);
4393 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4396 offs->tim_offset = beacon->head_len;
4397 offs->tim_length = skb->len - beacon->head_len;
4400 skb_put_data(skb, beacon->tail, beacon->tail_len);
4407 if (offs && beacon) {
4410 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4411 u16 csa_off = beacon->csa_counter_offsets[i];
4416 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4420 band = chanctx_conf->def.chan->band;
4422 info = IEEE80211_SKB_CB(skb);
4424 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4425 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4428 memset(&txrc, 0, sizeof(txrc));
4430 txrc.sband = local->hw.wiphy->bands[band];
4431 txrc.bss_conf = &sdata->vif.bss_conf;
4433 txrc.reported_rate.idx = -1;
4434 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4436 rate_control_get_rate(sdata, NULL, &txrc);
4438 info->control.vif = vif;
4440 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4441 IEEE80211_TX_CTL_ASSIGN_SEQ |
4442 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4450 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4451 struct ieee80211_vif *vif,
4452 struct ieee80211_mutable_offsets *offs)
4454 return __ieee80211_beacon_get(hw, vif, offs, true);
4456 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4458 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4459 struct ieee80211_vif *vif,
4460 u16 *tim_offset, u16 *tim_length)
4462 struct ieee80211_mutable_offsets offs = {};
4463 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4464 struct sk_buff *copy;
4465 struct ieee80211_supported_band *sband;
4472 *tim_offset = offs.tim_offset;
4475 *tim_length = offs.tim_length;
4477 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4478 !hw_to_local(hw)->monitors)
4481 /* send a copy to monitor interfaces */
4482 copy = skb_copy(bcn, GFP_ATOMIC);
4486 shift = ieee80211_vif_get_shift(vif);
4487 sband = ieee80211_get_sband(vif_to_sdata(vif));
4491 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4495 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4497 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4498 struct ieee80211_vif *vif)
4500 struct ieee80211_if_ap *ap = NULL;
4501 struct sk_buff *skb = NULL;
4502 struct probe_resp *presp = NULL;
4503 struct ieee80211_hdr *hdr;
4504 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4506 if (sdata->vif.type != NL80211_IFTYPE_AP)
4512 presp = rcu_dereference(ap->probe_resp);
4516 skb = dev_alloc_skb(presp->len);
4520 skb_put_data(skb, presp->data, presp->len);
4522 hdr = (struct ieee80211_hdr *) skb->data;
4523 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4529 EXPORT_SYMBOL(ieee80211_proberesp_get);
4531 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4532 struct ieee80211_vif *vif)
4534 struct ieee80211_sub_if_data *sdata;
4535 struct ieee80211_if_managed *ifmgd;
4536 struct ieee80211_pspoll *pspoll;
4537 struct ieee80211_local *local;
4538 struct sk_buff *skb;
4540 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4543 sdata = vif_to_sdata(vif);
4544 ifmgd = &sdata->u.mgd;
4545 local = sdata->local;
4547 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4551 skb_reserve(skb, local->hw.extra_tx_headroom);
4553 pspoll = skb_put_zero(skb, sizeof(*pspoll));
4554 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4555 IEEE80211_STYPE_PSPOLL);
4556 pspoll->aid = cpu_to_le16(ifmgd->aid);
4558 /* aid in PS-Poll has its two MSBs each set to 1 */
4559 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4561 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4562 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4566 EXPORT_SYMBOL(ieee80211_pspoll_get);
4568 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4569 struct ieee80211_vif *vif,
4572 struct ieee80211_hdr_3addr *nullfunc;
4573 struct ieee80211_sub_if_data *sdata;
4574 struct ieee80211_if_managed *ifmgd;
4575 struct ieee80211_local *local;
4576 struct sk_buff *skb;
4579 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4582 sdata = vif_to_sdata(vif);
4583 ifmgd = &sdata->u.mgd;
4584 local = sdata->local;
4587 struct sta_info *sta;
4590 sta = sta_info_get(sdata, ifmgd->bssid);
4591 qos = sta && sta->sta.wme;
4595 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4596 sizeof(*nullfunc) + 2);
4600 skb_reserve(skb, local->hw.extra_tx_headroom);
4602 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4603 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4604 IEEE80211_STYPE_NULLFUNC |
4605 IEEE80211_FCTL_TODS);
4607 __le16 qos = cpu_to_le16(7);
4609 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
4610 IEEE80211_STYPE_NULLFUNC) !=
4611 IEEE80211_STYPE_QOS_NULLFUNC);
4612 nullfunc->frame_control |=
4613 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
4615 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
4616 skb_put_data(skb, &qos, sizeof(qos));
4619 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4620 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4621 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4625 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4627 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4629 const u8 *ssid, size_t ssid_len,
4632 struct ieee80211_local *local = hw_to_local(hw);
4633 struct ieee80211_hdr_3addr *hdr;
4634 struct sk_buff *skb;
4638 ie_ssid_len = 2 + ssid_len;
4640 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4641 ie_ssid_len + tailroom);
4645 skb_reserve(skb, local->hw.extra_tx_headroom);
4647 hdr = skb_put_zero(skb, sizeof(*hdr));
4648 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4649 IEEE80211_STYPE_PROBE_REQ);
4650 eth_broadcast_addr(hdr->addr1);
4651 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4652 eth_broadcast_addr(hdr->addr3);
4654 pos = skb_put(skb, ie_ssid_len);
4655 *pos++ = WLAN_EID_SSID;
4658 memcpy(pos, ssid, ssid_len);
4663 EXPORT_SYMBOL(ieee80211_probereq_get);
4665 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4666 const void *frame, size_t frame_len,
4667 const struct ieee80211_tx_info *frame_txctl,
4668 struct ieee80211_rts *rts)
4670 const struct ieee80211_hdr *hdr = frame;
4672 rts->frame_control =
4673 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4674 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4676 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4677 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4679 EXPORT_SYMBOL(ieee80211_rts_get);
4681 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4682 const void *frame, size_t frame_len,
4683 const struct ieee80211_tx_info *frame_txctl,
4684 struct ieee80211_cts *cts)
4686 const struct ieee80211_hdr *hdr = frame;
4688 cts->frame_control =
4689 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4690 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4691 frame_len, frame_txctl);
4692 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4694 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4697 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4698 struct ieee80211_vif *vif)
4700 struct ieee80211_local *local = hw_to_local(hw);
4701 struct sk_buff *skb = NULL;
4702 struct ieee80211_tx_data tx;
4703 struct ieee80211_sub_if_data *sdata;
4705 struct ieee80211_tx_info *info;
4706 struct ieee80211_chanctx_conf *chanctx_conf;
4708 sdata = vif_to_sdata(vif);
4711 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4716 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4717 struct beacon_data *beacon =
4718 rcu_dereference(sdata->u.ap.beacon);
4720 if (!beacon || !beacon->head)
4723 ps = &sdata->u.ap.ps;
4724 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4725 ps = &sdata->u.mesh.ps;
4730 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4731 goto out; /* send buffered bc/mc only after DTIM beacon */
4734 skb = skb_dequeue(&ps->bc_buf);
4737 local->total_ps_buffered--;
4739 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4740 struct ieee80211_hdr *hdr =
4741 (struct ieee80211_hdr *) skb->data;
4742 /* more buffered multicast/broadcast frames ==> set
4743 * MoreData flag in IEEE 802.11 header to inform PS
4745 hdr->frame_control |=
4746 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4749 if (sdata->vif.type == NL80211_IFTYPE_AP)
4750 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4751 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4753 ieee80211_free_txskb(hw, skb);
4756 info = IEEE80211_SKB_CB(skb);
4758 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4759 info->band = chanctx_conf->def.chan->band;
4761 if (invoke_tx_handlers(&tx))
4768 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4770 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4772 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4773 struct ieee80211_sub_if_data *sdata = sta->sdata;
4774 struct ieee80211_local *local = sdata->local;
4778 lockdep_assert_held(&local->sta_mtx);
4780 /* only some cases are supported right now */
4781 switch (sdata->vif.type) {
4782 case NL80211_IFTYPE_STATION:
4783 case NL80211_IFTYPE_AP:
4784 case NL80211_IFTYPE_AP_VLAN:
4791 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4794 if (sta->reserved_tid == tid) {
4799 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4800 sdata_err(sdata, "TID reservation already active\n");
4805 ieee80211_stop_vif_queues(sdata->local, sdata,
4806 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4810 /* Tear down BA sessions so we stop aggregating on this TID */
4811 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4812 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4813 __ieee80211_stop_tx_ba_session(sta, tid,
4814 AGG_STOP_LOCAL_REQUEST);
4817 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4818 __ieee80211_flush_queues(local, sdata, queues, false);
4820 sta->reserved_tid = tid;
4822 ieee80211_wake_vif_queues(local, sdata,
4823 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4825 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4826 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4832 EXPORT_SYMBOL(ieee80211_reserve_tid);
4834 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4836 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4837 struct ieee80211_sub_if_data *sdata = sta->sdata;
4839 lockdep_assert_held(&sdata->local->sta_mtx);
4841 /* only some cases are supported right now */
4842 switch (sdata->vif.type) {
4843 case NL80211_IFTYPE_STATION:
4844 case NL80211_IFTYPE_AP:
4845 case NL80211_IFTYPE_AP_VLAN:
4852 if (tid != sta->reserved_tid) {
4853 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4857 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4859 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4861 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4862 struct sk_buff *skb, int tid,
4863 enum nl80211_band band, u32 txdata_flags)
4865 int ac = ieee80211_ac_from_tid(tid);
4867 skb_reset_mac_header(skb);
4868 skb_set_queue_mapping(skb, ac);
4869 skb->priority = tid;
4871 skb->dev = sdata->dev;
4874 * The other path calling ieee80211_xmit is from the tasklet,
4875 * and while we can handle concurrent transmissions locking
4876 * requirements are that we do not come into tx with bhs on.
4879 IEEE80211_SKB_CB(skb)->band = band;
4880 ieee80211_xmit(sdata, NULL, skb, txdata_flags);
4884 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
4885 const u8 *buf, size_t len,
4886 const u8 *dest, __be16 proto, bool unencrypted)
4888 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
4889 struct ieee80211_local *local = sdata->local;
4890 struct sk_buff *skb;
4891 struct ethhdr *ehdr;
4895 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
4896 * or Pre-Authentication
4898 if (proto != sdata->control_port_protocol &&
4899 proto != cpu_to_be16(ETH_P_PREAUTH))
4902 if (proto == sdata->control_port_protocol)
4903 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
4906 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT;
4910 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4911 sizeof(struct ethhdr) + len);
4915 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
4917 skb_put_data(skb, buf, len);
4919 ehdr = skb_push(skb, sizeof(struct ethhdr));
4920 memcpy(ehdr->h_dest, dest, ETH_ALEN);
4921 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
4922 ehdr->h_proto = proto;
4925 skb->protocol = htons(ETH_P_802_3);
4926 skb_reset_network_header(skb);
4927 skb_reset_mac_header(skb);
4930 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags);