2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 * Transmit and frame generation functions.
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/bitmap.h>
21 #include <linux/rcupdate.h>
22 #include <linux/export.h>
23 #include <net/net_namespace.h>
24 #include <net/ieee80211_radiotap.h>
25 #include <net/cfg80211.h>
26 #include <net/mac80211.h>
27 #include <net/codel.h>
28 #include <net/codel_impl.h>
29 #include <asm/unaligned.h>
30 #include <net/fq_impl.h>
32 #include "ieee80211_i.h"
33 #include "driver-ops.h"
43 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
45 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
47 u64_stats_update_begin(&tstats->syncp);
49 tstats->tx_bytes += len;
50 u64_stats_update_end(&tstats->syncp);
53 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
54 struct sk_buff *skb, int group_addr,
57 int rate, mrate, erp, dur, i, shift = 0;
58 struct ieee80211_rate *txrate;
59 struct ieee80211_local *local = tx->local;
60 struct ieee80211_supported_band *sband;
61 struct ieee80211_hdr *hdr;
62 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
63 struct ieee80211_chanctx_conf *chanctx_conf;
67 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
69 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
70 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
74 /* assume HW handles this */
75 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
79 if (WARN_ON_ONCE(tx->rate.idx < 0))
82 sband = local->hw.wiphy->bands[info->band];
83 txrate = &sband->bitrates[tx->rate.idx];
85 erp = txrate->flags & IEEE80211_RATE_ERP_G;
88 * data and mgmt (except PS Poll):
90 * - during contention period:
91 * if addr1 is group address: 0
92 * if more fragments = 0 and addr1 is individual address: time to
93 * transmit one ACK plus SIFS
94 * if more fragments = 1 and addr1 is individual address: time to
95 * transmit next fragment plus 2 x ACK plus 3 x SIFS
98 * - control response frame (CTS or ACK) shall be transmitted using the
99 * same rate as the immediately previous frame in the frame exchange
100 * sequence, if this rate belongs to the PHY mandatory rates, or else
101 * at the highest possible rate belonging to the PHY rates in the
104 hdr = (struct ieee80211_hdr *)skb->data;
105 if (ieee80211_is_ctl(hdr->frame_control)) {
106 /* TODO: These control frames are not currently sent by
107 * mac80211, but should they be implemented, this function
108 * needs to be updated to support duration field calculation.
110 * RTS: time needed to transmit pending data/mgmt frame plus
111 * one CTS frame plus one ACK frame plus 3 x SIFS
112 * CTS: duration of immediately previous RTS minus time
113 * required to transmit CTS and its SIFS
114 * ACK: 0 if immediately previous directed data/mgmt had
115 * more=0, with more=1 duration in ACK frame is duration
116 * from previous frame minus time needed to transmit ACK
118 * PS Poll: BIT(15) | BIT(14) | aid
124 if (0 /* FIX: data/mgmt during CFP */)
125 return cpu_to_le16(32768);
127 if (group_addr) /* Group address as the destination - no ACK */
130 /* Individual destination address:
131 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
132 * CTS and ACK frames shall be transmitted using the highest rate in
133 * basic rate set that is less than or equal to the rate of the
134 * immediately previous frame and that is using the same modulation
135 * (CCK or OFDM). If no basic rate set matches with these requirements,
136 * the highest mandatory rate of the PHY that is less than or equal to
137 * the rate of the previous frame is used.
138 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
141 /* use lowest available if everything fails */
142 mrate = sband->bitrates[0].bitrate;
143 for (i = 0; i < sband->n_bitrates; i++) {
144 struct ieee80211_rate *r = &sband->bitrates[i];
146 if (r->bitrate > txrate->bitrate)
149 if ((rate_flags & r->flags) != rate_flags)
152 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
153 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
155 switch (sband->band) {
156 case NL80211_BAND_2GHZ: {
158 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
159 flag = IEEE80211_RATE_MANDATORY_G;
161 flag = IEEE80211_RATE_MANDATORY_B;
166 case NL80211_BAND_5GHZ:
167 if (r->flags & IEEE80211_RATE_MANDATORY_A)
170 case NL80211_BAND_60GHZ:
171 /* TODO, for now fall through */
172 case NUM_NL80211_BANDS:
178 /* No matching basic rate found; use highest suitable mandatory
180 rate = DIV_ROUND_UP(mrate, 1 << shift);
183 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
184 if (ieee80211_is_data_qos(hdr->frame_control) &&
185 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
188 /* Time needed to transmit ACK
189 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
190 * to closest integer */
191 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
192 tx->sdata->vif.bss_conf.use_short_preamble,
196 /* Frame is fragmented: duration increases with time needed to
197 * transmit next fragment plus ACK and 2 x SIFS. */
198 dur *= 2; /* ACK + SIFS */
200 dur += ieee80211_frame_duration(sband->band, next_frag_len,
201 txrate->bitrate, erp,
202 tx->sdata->vif.bss_conf.use_short_preamble,
206 return cpu_to_le16(dur);
210 static ieee80211_tx_result debug_noinline
211 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
213 struct ieee80211_local *local = tx->local;
214 struct ieee80211_if_managed *ifmgd;
216 /* driver doesn't support power save */
217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
220 /* hardware does dynamic power save */
221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
224 /* dynamic power save disabled */
225 if (local->hw.conf.dynamic_ps_timeout <= 0)
228 /* we are scanning, don't enable power save */
232 if (!local->ps_sdata)
235 /* No point if we're going to suspend */
236 if (local->quiescing)
239 /* dynamic ps is supported only in managed mode */
240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
243 ifmgd = &tx->sdata->u.mgd;
246 * Don't wakeup from power save if u-apsd is enabled, voip ac has
247 * u-apsd enabled and the frame is in voip class. This effectively
248 * means that even if all access categories have u-apsd enabled, in
249 * practise u-apsd is only used with the voip ac. This is a
250 * workaround for the case when received voip class packets do not
251 * have correct qos tag for some reason, due the network or the
254 * Note: ifmgd->uapsd_queues access is racy here. If the value is
255 * changed via debugfs, user needs to reassociate manually to have
256 * everything in sync.
258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
263 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
264 ieee80211_stop_queues_by_reason(&local->hw,
265 IEEE80211_MAX_QUEUE_MAP,
266 IEEE80211_QUEUE_STOP_REASON_PS,
268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
269 ieee80211_queue_work(&local->hw,
270 &local->dynamic_ps_disable_work);
273 /* Don't restart the timer if we're not disassociated */
274 if (!ifmgd->associated)
277 mod_timer(&local->dynamic_ps_timer, jiffies +
278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
283 static ieee80211_tx_result debug_noinline
284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
296 !ieee80211_is_probe_req(hdr->frame_control) &&
297 !ieee80211_is_nullfunc(hdr->frame_control))
299 * When software scanning only nullfunc frames (to notify
300 * the sleep state to the AP) and probe requests (for the
301 * active scan) are allowed, all other frames should not be
302 * sent and we should not get here, but if we do
303 * nonetheless, drop them to avoid sending them
304 * off-channel. See the link below and
305 * ieee80211_start_scan() for more.
307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
314 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
317 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
321 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
323 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
324 if (unlikely(!assoc &&
325 ieee80211_is_data(hdr->frame_control))) {
326 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
327 sdata_info(tx->sdata,
328 "dropped data frame to not associated station %pM\n",
331 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
334 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
335 ieee80211_is_data(hdr->frame_control) &&
336 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
338 * No associated STAs - no need to send multicast
347 /* This function is called whenever the AP is about to exceed the maximum limit
348 * of buffered frames for power saving STAs. This situation should not really
349 * happen often during normal operation, so dropping the oldest buffered packet
350 * from each queue should be OK to make some room for new frames. */
351 static void purge_old_ps_buffers(struct ieee80211_local *local)
353 int total = 0, purged = 0;
355 struct ieee80211_sub_if_data *sdata;
356 struct sta_info *sta;
358 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
361 if (sdata->vif.type == NL80211_IFTYPE_AP)
362 ps = &sdata->u.ap.ps;
363 else if (ieee80211_vif_is_mesh(&sdata->vif))
364 ps = &sdata->u.mesh.ps;
368 skb = skb_dequeue(&ps->bc_buf);
371 ieee80211_free_txskb(&local->hw, skb);
373 total += skb_queue_len(&ps->bc_buf);
377 * Drop one frame from each station from the lowest-priority
378 * AC that has frames at all.
380 list_for_each_entry_rcu(sta, &local->sta_list, list) {
383 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
384 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
385 total += skb_queue_len(&sta->ps_tx_buf[ac]);
388 ieee80211_free_txskb(&local->hw, skb);
394 local->total_ps_buffered = total;
395 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
398 static ieee80211_tx_result
399 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
402 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
406 * broadcast/multicast frame
408 * If any of the associated/peer stations is in power save mode,
409 * the frame is buffered to be sent after DTIM beacon frame.
410 * This is done either by the hardware or us.
413 /* powersaving STAs currently only in AP/VLAN/mesh mode */
414 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
415 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
419 ps = &tx->sdata->bss->ps;
420 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
421 ps = &tx->sdata->u.mesh.ps;
427 /* no buffering for ordered frames */
428 if (ieee80211_has_order(hdr->frame_control))
431 if (ieee80211_is_probe_req(hdr->frame_control))
434 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
435 info->hw_queue = tx->sdata->vif.cab_queue;
437 /* no stations in PS mode */
438 if (!atomic_read(&ps->num_sta_ps))
441 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
443 /* device releases frame after DTIM beacon */
444 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
447 /* buffered in mac80211 */
448 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
449 purge_old_ps_buffers(tx->local);
451 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
453 "BC TX buffer full - dropping the oldest frame\n");
454 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
456 tx->local->total_ps_buffered++;
458 skb_queue_tail(&ps->bc_buf, tx->skb);
463 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
466 if (!ieee80211_is_mgmt(fc))
469 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
472 if (!ieee80211_is_robust_mgmt_frame(skb))
478 static ieee80211_tx_result
479 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
481 struct sta_info *sta = tx->sta;
482 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
483 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
484 struct ieee80211_local *local = tx->local;
489 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
490 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
491 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
492 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
493 int ac = skb_get_queue_mapping(tx->skb);
495 if (ieee80211_is_mgmt(hdr->frame_control) &&
496 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
497 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
501 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
502 sta->sta.addr, sta->sta.aid, ac);
503 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
504 purge_old_ps_buffers(tx->local);
506 /* sync with ieee80211_sta_ps_deliver_wakeup */
507 spin_lock(&sta->ps_lock);
509 * STA woke up the meantime and all the frames on ps_tx_buf have
510 * been queued to pending queue. No reordering can happen, go
511 * ahead and Tx the packet.
513 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
514 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
515 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
516 spin_unlock(&sta->ps_lock);
520 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
521 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
523 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
525 ieee80211_free_txskb(&local->hw, old);
527 tx->local->total_ps_buffered++;
529 info->control.jiffies = jiffies;
530 info->control.vif = &tx->sdata->vif;
531 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
532 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
533 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
534 spin_unlock(&sta->ps_lock);
536 if (!timer_pending(&local->sta_cleanup))
537 mod_timer(&local->sta_cleanup,
538 round_jiffies(jiffies +
539 STA_INFO_CLEANUP_INTERVAL));
542 * We queued up some frames, so the TIM bit might
543 * need to be set, recalculate it.
545 sta_info_recalc_tim(sta);
548 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
550 "STA %pM in PS mode, but polling/in SP -> send frame\n",
557 static ieee80211_tx_result debug_noinline
558 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
560 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
563 if (tx->flags & IEEE80211_TX_UNICAST)
564 return ieee80211_tx_h_unicast_ps_buf(tx);
566 return ieee80211_tx_h_multicast_ps_buf(tx);
569 static ieee80211_tx_result debug_noinline
570 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
574 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
575 if (tx->sdata->control_port_no_encrypt)
576 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
577 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
578 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
584 static ieee80211_tx_result debug_noinline
585 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
587 struct ieee80211_key *key;
588 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
589 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
591 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
594 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
596 else if (ieee80211_is_group_privacy_action(tx->skb) &&
597 (key = rcu_dereference(tx->sdata->default_multicast_key)))
599 else if (ieee80211_is_mgmt(hdr->frame_control) &&
600 is_multicast_ether_addr(hdr->addr1) &&
601 ieee80211_is_robust_mgmt_frame(tx->skb) &&
602 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
604 else if (is_multicast_ether_addr(hdr->addr1) &&
605 (key = rcu_dereference(tx->sdata->default_multicast_key)))
607 else if (!is_multicast_ether_addr(hdr->addr1) &&
608 (key = rcu_dereference(tx->sdata->default_unicast_key)))
614 bool skip_hw = false;
616 /* TODO: add threshold stuff again */
618 switch (tx->key->conf.cipher) {
619 case WLAN_CIPHER_SUITE_WEP40:
620 case WLAN_CIPHER_SUITE_WEP104:
621 case WLAN_CIPHER_SUITE_TKIP:
622 if (!ieee80211_is_data_present(hdr->frame_control))
625 case WLAN_CIPHER_SUITE_CCMP:
626 case WLAN_CIPHER_SUITE_CCMP_256:
627 case WLAN_CIPHER_SUITE_GCMP:
628 case WLAN_CIPHER_SUITE_GCMP_256:
629 if (!ieee80211_is_data_present(hdr->frame_control) &&
630 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
632 !ieee80211_is_group_privacy_action(tx->skb))
635 skip_hw = (tx->key->conf.flags &
636 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
637 ieee80211_is_mgmt(hdr->frame_control);
639 case WLAN_CIPHER_SUITE_AES_CMAC:
640 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
641 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
643 if (!ieee80211_is_mgmt(hdr->frame_control))
648 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
649 !ieee80211_is_deauth(hdr->frame_control)))
652 if (!skip_hw && tx->key &&
653 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
654 info->control.hw_key = &tx->key->conf;
660 static ieee80211_tx_result debug_noinline
661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
664 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
665 struct ieee80211_supported_band *sband;
667 struct ieee80211_tx_rate_control txrc;
668 struct ieee80211_sta_rates *ratetbl = NULL;
671 memset(&txrc, 0, sizeof(txrc));
673 sband = tx->local->hw.wiphy->bands[info->band];
675 len = min_t(u32, tx->skb->len + FCS_LEN,
676 tx->local->hw.wiphy->frag_threshold);
678 /* set up the tx rate control struct we give the RC algo */
679 txrc.hw = &tx->local->hw;
681 txrc.bss_conf = &tx->sdata->vif.bss_conf;
683 txrc.reported_rate.idx = -1;
684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
685 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
686 txrc.max_rate_idx = -1;
688 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
690 if (tx->sdata->rc_has_mcs_mask[info->band])
691 txrc.rate_idx_mcs_mask =
692 tx->sdata->rc_rateidx_mcs_mask[info->band];
694 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
695 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
696 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
697 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
699 /* set up RTS protection if desired */
700 if (len > tx->local->hw.wiphy->rts_threshold) {
704 info->control.use_rts = txrc.rts;
705 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
708 * Use short preamble if the BSS can handle it, but not for
709 * management frames unless we know the receiver can handle
710 * that -- the management frame might be to a station that
711 * just wants a probe response.
713 if (tx->sdata->vif.bss_conf.use_short_preamble &&
714 (ieee80211_is_data(hdr->frame_control) ||
715 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
716 txrc.short_preamble = true;
718 info->control.short_preamble = txrc.short_preamble;
720 /* don't ask rate control when rate already injected via radiotap */
721 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
725 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
728 * Lets not bother rate control if we're associated and cannot
729 * talk to the sta. This should not happen.
731 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
732 !rate_usable_index_exists(sband, &tx->sta->sta),
733 "%s: Dropped data frame as no usable bitrate found while "
734 "scanning and associated. Target station: "
735 "%pM on %d GHz band\n",
736 tx->sdata->name, hdr->addr1,
741 * If we're associated with the sta at this point we know we can at
742 * least send the frame at the lowest bit rate.
744 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
746 if (tx->sta && !info->control.skip_table)
747 ratetbl = rcu_dereference(tx->sta->sta.rates);
749 if (unlikely(info->control.rates[0].idx < 0)) {
751 struct ieee80211_tx_rate rate = {
752 .idx = ratetbl->rate[0].idx,
753 .flags = ratetbl->rate[0].flags,
754 .count = ratetbl->rate[0].count
757 if (ratetbl->rate[0].idx < 0)
765 tx->rate = info->control.rates[0];
768 if (txrc.reported_rate.idx < 0) {
769 txrc.reported_rate = tx->rate;
770 if (tx->sta && ieee80211_is_data(hdr->frame_control))
771 tx->sta->tx_stats.last_rate = txrc.reported_rate;
773 tx->sta->tx_stats.last_rate = txrc.reported_rate;
778 if (unlikely(!info->control.rates[0].count))
779 info->control.rates[0].count = 1;
781 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
782 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
783 info->control.rates[0].count = 1;
788 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
790 u16 *seq = &sta->tid_seq[tid];
791 __le16 ret = cpu_to_le16(*seq);
793 /* Increase the sequence number. */
794 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
799 static ieee80211_tx_result debug_noinline
800 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
802 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
803 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
808 * Packet injection may want to control the sequence
809 * number, if we have no matching interface then we
810 * neither assign one ourselves nor ask the driver to.
812 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
815 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
818 if (ieee80211_hdrlen(hdr->frame_control) < 24)
821 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
825 * Anything but QoS data that has a sequence number field
826 * (is long enough) gets a sequence number from the global
827 * counter. QoS data frames with a multicast destination
828 * also use the global counter (802.11-2012 9.3.2.10).
830 if (!ieee80211_is_data_qos(hdr->frame_control) ||
831 is_multicast_ether_addr(hdr->addr1)) {
832 /* driver should assign sequence number */
833 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
834 /* for pure STA mode without beacons, we can do it */
835 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
836 tx->sdata->sequence_number += 0x10;
838 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
843 * This should be true for injected/management frames only, for
844 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
845 * above since they are not QoS-data frames.
850 /* include per-STA, per-TID sequence counter */
852 qc = ieee80211_get_qos_ctl(hdr);
853 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
854 tx->sta->tx_stats.msdu[tid]++;
856 if (!tx->sta->sta.txq[0])
857 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
862 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
863 struct sk_buff *skb, int hdrlen,
866 struct ieee80211_local *local = tx->local;
867 struct ieee80211_tx_info *info;
869 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
870 int pos = hdrlen + per_fragm;
871 int rem = skb->len - hdrlen - per_fragm;
873 if (WARN_ON(rem < 0))
876 /* first fragment was already added to queue by caller */
879 int fraglen = per_fragm;
884 tmp = dev_alloc_skb(local->tx_headroom +
886 tx->sdata->encrypt_headroom +
887 IEEE80211_ENCRYPT_TAILROOM);
891 __skb_queue_tail(&tx->skbs, tmp);
894 local->tx_headroom + tx->sdata->encrypt_headroom);
896 /* copy control information */
897 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
899 info = IEEE80211_SKB_CB(tmp);
900 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
901 IEEE80211_TX_CTL_FIRST_FRAGMENT);
904 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
906 skb_copy_queue_mapping(tmp, skb);
907 tmp->priority = skb->priority;
910 /* copy header and data */
911 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
912 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
917 /* adjust first fragment's length */
918 skb_trim(skb, hdrlen + per_fragm);
922 static ieee80211_tx_result debug_noinline
923 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
925 struct sk_buff *skb = tx->skb;
926 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
927 struct ieee80211_hdr *hdr = (void *)skb->data;
928 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
932 /* no matter what happens, tx->skb moves to tx->skbs */
933 __skb_queue_tail(&tx->skbs, skb);
936 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
939 if (tx->local->ops->set_frag_threshold)
943 * Warn when submitting a fragmented A-MPDU frame and drop it.
944 * This scenario is handled in ieee80211_tx_prepare but extra
945 * caution taken here as fragmented ampdu may cause Tx stop.
947 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
950 hdrlen = ieee80211_hdrlen(hdr->frame_control);
952 /* internal error, why isn't DONTFRAG set? */
953 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
957 * Now fragment the frame. This will allocate all the fragments and
958 * chain them (using skb as the first fragment) to skb->next.
959 * During transmission, we will remove the successfully transmitted
960 * fragments from this list. When the low-level driver rejects one
961 * of the fragments then we will simply pretend to accept the skb
962 * but store it away as pending.
964 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
967 /* update duration/seq/flags of fragments */
970 skb_queue_walk(&tx->skbs, skb) {
971 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
973 hdr = (void *)skb->data;
974 info = IEEE80211_SKB_CB(skb);
976 if (!skb_queue_is_last(&tx->skbs, skb)) {
977 hdr->frame_control |= morefrags;
979 * No multi-rate retries for fragmented frames, that
980 * would completely throw off the NAV at other STAs.
982 info->control.rates[1].idx = -1;
983 info->control.rates[2].idx = -1;
984 info->control.rates[3].idx = -1;
985 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
986 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
988 hdr->frame_control &= ~morefrags;
990 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
997 static ieee80211_tx_result debug_noinline
998 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1000 struct sk_buff *skb;
1006 skb_queue_walk(&tx->skbs, skb) {
1007 ac = skb_get_queue_mapping(skb);
1008 tx->sta->tx_stats.bytes[ac] += skb->len;
1011 tx->sta->tx_stats.packets[ac]++;
1016 static ieee80211_tx_result debug_noinline
1017 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1022 switch (tx->key->conf.cipher) {
1023 case WLAN_CIPHER_SUITE_WEP40:
1024 case WLAN_CIPHER_SUITE_WEP104:
1025 return ieee80211_crypto_wep_encrypt(tx);
1026 case WLAN_CIPHER_SUITE_TKIP:
1027 return ieee80211_crypto_tkip_encrypt(tx);
1028 case WLAN_CIPHER_SUITE_CCMP:
1029 return ieee80211_crypto_ccmp_encrypt(
1030 tx, IEEE80211_CCMP_MIC_LEN);
1031 case WLAN_CIPHER_SUITE_CCMP_256:
1032 return ieee80211_crypto_ccmp_encrypt(
1033 tx, IEEE80211_CCMP_256_MIC_LEN);
1034 case WLAN_CIPHER_SUITE_AES_CMAC:
1035 return ieee80211_crypto_aes_cmac_encrypt(tx);
1036 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1037 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1038 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1039 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1040 return ieee80211_crypto_aes_gmac_encrypt(tx);
1041 case WLAN_CIPHER_SUITE_GCMP:
1042 case WLAN_CIPHER_SUITE_GCMP_256:
1043 return ieee80211_crypto_gcmp_encrypt(tx);
1045 return ieee80211_crypto_hw_encrypt(tx);
1051 static ieee80211_tx_result debug_noinline
1052 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1054 struct sk_buff *skb;
1055 struct ieee80211_hdr *hdr;
1059 skb_queue_walk(&tx->skbs, skb) {
1060 hdr = (void *) skb->data;
1061 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1062 break; /* must not overwrite AID */
1063 if (!skb_queue_is_last(&tx->skbs, skb)) {
1064 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1065 next_len = next->len;
1068 group_addr = is_multicast_ether_addr(hdr->addr1);
1071 ieee80211_duration(tx, skb, group_addr, next_len);
1077 /* actual transmit path */
1079 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1080 struct sk_buff *skb,
1081 struct ieee80211_tx_info *info,
1082 struct tid_ampdu_tx *tid_tx,
1085 bool queued = false;
1086 bool reset_agg_timer = false;
1087 struct sk_buff *purge_skb = NULL;
1089 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1090 info->flags |= IEEE80211_TX_CTL_AMPDU;
1091 reset_agg_timer = true;
1092 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1094 * nothing -- this aggregation session is being started
1095 * but that might still fail with the driver
1097 } else if (!tx->sta->sta.txq[tid]) {
1098 spin_lock(&tx->sta->lock);
1100 * Need to re-check now, because we may get here
1102 * 1) in the window during which the setup is actually
1103 * already done, but not marked yet because not all
1104 * packets are spliced over to the driver pending
1105 * queue yet -- if this happened we acquire the lock
1106 * either before or after the splice happens, but
1107 * need to recheck which of these cases happened.
1109 * 2) during session teardown, if the OPERATIONAL bit
1110 * was cleared due to the teardown but the pointer
1111 * hasn't been assigned NULL yet (or we loaded it
1112 * before it was assigned) -- in this case it may
1113 * now be NULL which means we should just let the
1114 * packet pass through because splicing the frames
1115 * back is already done.
1117 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1120 /* do nothing, let packet pass through */
1121 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1122 info->flags |= IEEE80211_TX_CTL_AMPDU;
1123 reset_agg_timer = true;
1126 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1127 clear_sta_flag(tx->sta, WLAN_STA_SP);
1128 ps_dbg(tx->sta->sdata,
1129 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1130 tx->sta->sta.addr, tx->sta->sta.aid);
1132 info->control.vif = &tx->sdata->vif;
1133 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1134 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1135 __skb_queue_tail(&tid_tx->pending, skb);
1136 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1137 purge_skb = __skb_dequeue(&tid_tx->pending);
1139 spin_unlock(&tx->sta->lock);
1142 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1145 /* reset session timer */
1146 if (reset_agg_timer && tid_tx->timeout)
1147 tid_tx->last_tx = jiffies;
1154 * pass %NULL for the station if unknown, a valid pointer if known
1155 * or an ERR_PTR() if the station is known not to exist
1157 static ieee80211_tx_result
1158 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1159 struct ieee80211_tx_data *tx,
1160 struct sta_info *sta, struct sk_buff *skb)
1162 struct ieee80211_local *local = sdata->local;
1163 struct ieee80211_hdr *hdr;
1164 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1168 memset(tx, 0, sizeof(*tx));
1172 __skb_queue_head_init(&tx->skbs);
1175 * If this flag is set to true anywhere, and we get here,
1176 * we are doing the needed processing, so remove the flag
1179 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1181 hdr = (struct ieee80211_hdr *) skb->data;
1187 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1188 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1189 if (!tx->sta && sdata->wdev.use_4addr)
1191 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1192 IEEE80211_TX_CTL_INJECTED) ||
1193 tx->sdata->control_port_protocol == tx->skb->protocol) {
1194 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1196 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1197 tx->sta = sta_info_get(sdata, hdr->addr1);
1200 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1201 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1202 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1203 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1204 struct tid_ampdu_tx *tid_tx;
1206 qc = ieee80211_get_qos_ctl(hdr);
1207 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1209 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1213 queued = ieee80211_tx_prep_agg(tx, skb, info,
1216 if (unlikely(queued))
1221 if (is_multicast_ether_addr(hdr->addr1)) {
1222 tx->flags &= ~IEEE80211_TX_UNICAST;
1223 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1225 tx->flags |= IEEE80211_TX_UNICAST;
1227 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1228 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1229 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1230 info->flags & IEEE80211_TX_CTL_AMPDU)
1231 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1235 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1236 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1237 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1238 ieee80211_check_fast_xmit(tx->sta);
1241 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1246 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1247 struct ieee80211_vif *vif,
1248 struct ieee80211_sta *pubsta,
1249 struct sk_buff *skb)
1251 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1252 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1253 struct ieee80211_txq *txq = NULL;
1255 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1256 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1259 if (!ieee80211_is_data(hdr->frame_control))
1263 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1265 txq = pubsta->txq[tid];
1273 return to_txq_info(txq);
1276 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1278 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1281 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi)
1283 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif;
1286 static u32 codel_skb_len_func(const struct sk_buff *skb)
1291 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1293 const struct ieee80211_tx_info *info;
1295 info = (const struct ieee80211_tx_info *)skb->cb;
1296 return info->control.enqueue_time;
1299 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1302 struct ieee80211_local *local;
1303 struct txq_info *txqi;
1305 struct fq_flow *flow;
1308 local = vif_to_sdata(txqi->txq.vif)->local;
1311 if (cvars == &txqi->def_cvars)
1312 flow = &txqi->def_flow;
1314 flow = &fq->flows[cvars - local->cvars];
1316 return fq_flow_dequeue(fq, flow);
1319 static void codel_drop_func(struct sk_buff *skb,
1322 struct ieee80211_local *local;
1323 struct ieee80211_hw *hw;
1324 struct txq_info *txqi;
1327 local = vif_to_sdata(txqi->txq.vif)->local;
1330 ieee80211_free_txskb(hw, skb);
1333 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1335 struct fq_flow *flow)
1337 struct ieee80211_local *local;
1338 struct txq_info *txqi;
1339 struct codel_vars *cvars;
1340 struct codel_params *cparams;
1341 struct codel_stats *cstats;
1343 local = container_of(fq, struct ieee80211_local, fq);
1344 txqi = container_of(tin, struct txq_info, tin);
1345 cparams = &local->cparams;
1346 cstats = &local->cstats;
1348 if (flow == &txqi->def_flow)
1349 cvars = &txqi->def_cvars;
1351 cvars = &local->cvars[flow - fq->flows];
1353 return codel_dequeue(txqi,
1359 codel_skb_time_func,
1361 codel_dequeue_func);
1364 static void fq_skb_free_func(struct fq *fq,
1366 struct fq_flow *flow,
1367 struct sk_buff *skb)
1369 struct ieee80211_local *local;
1371 local = container_of(fq, struct ieee80211_local, fq);
1372 ieee80211_free_txskb(&local->hw, skb);
1375 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1378 struct sk_buff *skb)
1380 struct txq_info *txqi;
1382 txqi = container_of(tin, struct txq_info, tin);
1383 return &txqi->def_flow;
1386 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1387 struct txq_info *txqi,
1388 struct sk_buff *skb)
1390 struct fq *fq = &local->fq;
1391 struct fq_tin *tin = &txqi->tin;
1393 ieee80211_set_skb_enqueue_time(skb);
1394 fq_tin_enqueue(fq, tin, skb,
1396 fq_flow_get_default_func);
1399 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1400 struct sta_info *sta,
1401 struct txq_info *txqi, int tid)
1403 fq_tin_init(&txqi->tin);
1404 fq_flow_init(&txqi->def_flow);
1405 codel_vars_init(&txqi->def_cvars);
1407 txqi->txq.vif = &sdata->vif;
1410 txqi->txq.sta = &sta->sta;
1411 sta->sta.txq[tid] = &txqi->txq;
1412 txqi->txq.tid = tid;
1413 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
1415 sdata->vif.txq = &txqi->txq;
1417 txqi->txq.ac = IEEE80211_AC_BE;
1421 void ieee80211_txq_purge(struct ieee80211_local *local,
1422 struct txq_info *txqi)
1424 struct fq *fq = &local->fq;
1425 struct fq_tin *tin = &txqi->tin;
1427 fq_tin_reset(fq, tin, fq_skb_free_func);
1430 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1432 struct fq *fq = &local->fq;
1436 if (!local->ops->wake_tx_queue)
1439 ret = fq_init(fq, 4096);
1443 codel_params_init(&local->cparams);
1444 codel_stats_init(&local->cstats);
1445 local->cparams.interval = MS2TIME(100);
1446 local->cparams.target = MS2TIME(20);
1447 local->cparams.ecn = true;
1449 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1451 if (!local->cvars) {
1452 spin_lock_bh(&fq->lock);
1453 fq_reset(fq, fq_skb_free_func);
1454 spin_unlock_bh(&fq->lock);
1458 for (i = 0; i < fq->flows_cnt; i++)
1459 codel_vars_init(&local->cvars[i]);
1464 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1466 struct fq *fq = &local->fq;
1468 if (!local->ops->wake_tx_queue)
1471 kfree(local->cvars);
1472 local->cvars = NULL;
1474 spin_lock_bh(&fq->lock);
1475 fq_reset(fq, fq_skb_free_func);
1476 spin_unlock_bh(&fq->lock);
1479 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
1480 struct ieee80211_txq *txq)
1482 struct ieee80211_local *local = hw_to_local(hw);
1483 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
1484 struct ieee80211_hdr *hdr;
1485 struct sk_buff *skb = NULL;
1486 struct fq *fq = &local->fq;
1487 struct fq_tin *tin = &txqi->tin;
1489 spin_lock_bh(&fq->lock);
1491 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
1494 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
1498 ieee80211_set_skb_vif(skb, txqi);
1500 hdr = (struct ieee80211_hdr *)skb->data;
1501 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1502 struct sta_info *sta = container_of(txq->sta, struct sta_info,
1504 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1506 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
1507 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
1508 info->flags |= IEEE80211_TX_CTL_AMPDU;
1510 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1514 spin_unlock_bh(&fq->lock);
1516 if (skb && skb_has_frag_list(skb) &&
1517 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST))
1522 EXPORT_SYMBOL(ieee80211_tx_dequeue);
1524 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1525 struct ieee80211_vif *vif,
1526 struct ieee80211_sta *sta,
1527 struct sk_buff_head *skbs,
1530 struct ieee80211_tx_control control = {};
1531 struct fq *fq = &local->fq;
1532 struct sk_buff *skb, *tmp;
1533 struct txq_info *txqi;
1534 unsigned long flags;
1536 skb_queue_walk_safe(skbs, skb, tmp) {
1537 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1538 int q = info->hw_queue;
1540 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1541 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1542 __skb_unlink(skb, skbs);
1543 ieee80211_free_txskb(&local->hw, skb);
1548 txqi = ieee80211_get_txq(local, vif, sta, skb);
1550 info->control.vif = vif;
1552 __skb_unlink(skb, skbs);
1554 spin_lock_bh(&fq->lock);
1555 ieee80211_txq_enqueue(local, txqi, skb);
1556 spin_unlock_bh(&fq->lock);
1558 drv_wake_tx_queue(local, txqi);
1563 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1564 if (local->queue_stop_reasons[q] ||
1565 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1566 if (unlikely(info->flags &
1567 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1568 if (local->queue_stop_reasons[q] &
1569 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1571 * Drop off-channel frames if queues
1572 * are stopped for any reason other
1573 * than off-channel operation. Never
1576 spin_unlock_irqrestore(
1577 &local->queue_stop_reason_lock,
1579 ieee80211_purge_tx_queue(&local->hw,
1586 * Since queue is stopped, queue up frames for
1587 * later transmission from the tx-pending
1588 * tasklet when the queue is woken again.
1591 skb_queue_splice_init(skbs,
1592 &local->pending[q]);
1594 skb_queue_splice_tail_init(skbs,
1595 &local->pending[q]);
1597 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1602 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1604 info->control.vif = vif;
1607 __skb_unlink(skb, skbs);
1608 drv_tx(local, &control, skb);
1615 * Returns false if the frame couldn't be transmitted but was queued instead.
1617 static bool __ieee80211_tx(struct ieee80211_local *local,
1618 struct sk_buff_head *skbs, int led_len,
1619 struct sta_info *sta, bool txpending)
1621 struct ieee80211_tx_info *info;
1622 struct ieee80211_sub_if_data *sdata;
1623 struct ieee80211_vif *vif;
1624 struct ieee80211_sta *pubsta;
1625 struct sk_buff *skb;
1629 if (WARN_ON(skb_queue_empty(skbs)))
1632 skb = skb_peek(skbs);
1633 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1634 info = IEEE80211_SKB_CB(skb);
1635 sdata = vif_to_sdata(info->control.vif);
1636 if (sta && !sta->uploaded)
1644 switch (sdata->vif.type) {
1645 case NL80211_IFTYPE_MONITOR:
1646 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1650 sdata = rcu_dereference(local->monitor_sdata);
1654 vif->hw_queue[skb_get_queue_mapping(skb)];
1655 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1656 ieee80211_purge_tx_queue(&local->hw, skbs);
1661 case NL80211_IFTYPE_AP_VLAN:
1662 sdata = container_of(sdata->bss,
1663 struct ieee80211_sub_if_data, u.ap);
1670 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1673 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1675 WARN_ON_ONCE(!skb_queue_empty(skbs));
1681 * Invoke TX handlers, return 0 on success and non-zero if the
1682 * frame was dropped or queued.
1684 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1686 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1687 ieee80211_tx_result res = TX_DROP;
1689 #define CALL_TXH(txh) \
1692 if (res != TX_CONTINUE) \
1696 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1697 CALL_TXH(ieee80211_tx_h_check_assoc);
1698 CALL_TXH(ieee80211_tx_h_ps_buf);
1699 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1700 CALL_TXH(ieee80211_tx_h_select_key);
1701 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1702 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1704 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1705 __skb_queue_tail(&tx->skbs, tx->skb);
1710 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1711 CALL_TXH(ieee80211_tx_h_sequence);
1712 CALL_TXH(ieee80211_tx_h_fragment);
1713 /* handlers after fragment must be aware of tx info fragmentation! */
1714 CALL_TXH(ieee80211_tx_h_stats);
1715 CALL_TXH(ieee80211_tx_h_encrypt);
1716 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1717 CALL_TXH(ieee80211_tx_h_calculate_duration);
1721 if (unlikely(res == TX_DROP)) {
1722 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1724 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1726 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1728 } else if (unlikely(res == TX_QUEUED)) {
1729 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1736 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1737 struct ieee80211_vif *vif, struct sk_buff *skb,
1738 int band, struct ieee80211_sta **sta)
1740 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1741 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1742 struct ieee80211_tx_data tx;
1743 struct sk_buff *skb2;
1745 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1749 info->control.vif = vif;
1750 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1752 if (invoke_tx_handlers(&tx))
1757 *sta = &tx.sta->sta;
1762 /* this function isn't suitable for fragmented data frames */
1763 skb2 = __skb_dequeue(&tx.skbs);
1764 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1765 ieee80211_free_txskb(hw, skb2);
1766 ieee80211_purge_tx_queue(hw, &tx.skbs);
1772 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1775 * Returns false if the frame couldn't be transmitted but was queued instead.
1777 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1778 struct sta_info *sta, struct sk_buff *skb,
1781 struct ieee80211_local *local = sdata->local;
1782 struct ieee80211_tx_data tx;
1783 ieee80211_tx_result res_prepare;
1784 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1788 if (unlikely(skb->len < 10)) {
1793 /* initialises tx */
1795 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1797 if (unlikely(res_prepare == TX_DROP)) {
1798 ieee80211_free_txskb(&local->hw, skb);
1800 } else if (unlikely(res_prepare == TX_QUEUED)) {
1804 /* set up hw_queue value early */
1805 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1806 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1808 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1810 if (!invoke_tx_handlers(&tx))
1811 result = __ieee80211_tx(local, &tx.skbs, led_len,
1817 /* device xmit handlers */
1819 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1820 struct sk_buff *skb,
1821 int head_need, bool may_encrypt)
1823 struct ieee80211_local *local = sdata->local;
1826 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1827 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1828 tail_need -= skb_tailroom(skb);
1829 tail_need = max_t(int, tail_need, 0);
1832 if (skb_cloned(skb) &&
1833 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1834 !skb_clone_writable(skb, ETH_HLEN) ||
1835 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1836 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1837 else if (head_need || tail_need)
1838 I802_DEBUG_INC(local->tx_expand_skb_head);
1842 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1843 wiphy_debug(local->hw.wiphy,
1844 "failed to reallocate TX buffer\n");
1851 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1852 struct sta_info *sta, struct sk_buff *skb)
1854 struct ieee80211_local *local = sdata->local;
1855 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1856 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1860 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1862 headroom = local->tx_headroom;
1864 headroom += sdata->encrypt_headroom;
1865 headroom -= skb_headroom(skb);
1866 headroom = max_t(int, 0, headroom);
1868 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1869 ieee80211_free_txskb(&local->hw, skb);
1873 hdr = (struct ieee80211_hdr *) skb->data;
1874 info->control.vif = &sdata->vif;
1876 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1877 if (ieee80211_is_data(hdr->frame_control) &&
1878 is_unicast_ether_addr(hdr->addr1)) {
1879 if (mesh_nexthop_resolve(sdata, skb))
1880 return; /* skb queued: don't free */
1882 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1886 ieee80211_set_qos_hdr(sdata, skb);
1887 ieee80211_tx(sdata, sta, skb, false);
1890 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1891 struct sk_buff *skb)
1893 struct ieee80211_radiotap_iterator iterator;
1894 struct ieee80211_radiotap_header *rthdr =
1895 (struct ieee80211_radiotap_header *) skb->data;
1896 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1897 struct ieee80211_supported_band *sband =
1898 local->hw.wiphy->bands[info->band];
1899 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1903 bool rate_found = false;
1904 u8 rate_retries = 0;
1906 u8 mcs_known, mcs_flags, mcs_bw;
1908 u8 vht_mcs = 0, vht_nss = 0;
1911 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1912 IEEE80211_TX_CTL_DONTFRAG;
1915 * for every radiotap entry that is present
1916 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1917 * entries present, or -EINVAL on error)
1921 ret = ieee80211_radiotap_iterator_next(&iterator);
1926 /* see if this argument is something we can use */
1927 switch (iterator.this_arg_index) {
1929 * You must take care when dereferencing iterator.this_arg
1930 * for multibyte types... the pointer is not aligned. Use
1931 * get_unaligned((type *)iterator.this_arg) to dereference
1932 * iterator.this_arg for type "type" safely on all arches.
1934 case IEEE80211_RADIOTAP_FLAGS:
1935 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1937 * this indicates that the skb we have been
1938 * handed has the 32-bit FCS CRC at the end...
1939 * we should react to that by snipping it off
1940 * because it will be recomputed and added
1943 if (skb->len < (iterator._max_length + FCS_LEN))
1946 skb_trim(skb, skb->len - FCS_LEN);
1948 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1949 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1950 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1951 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1954 case IEEE80211_RADIOTAP_TX_FLAGS:
1955 txflags = get_unaligned_le16(iterator.this_arg);
1956 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1957 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1960 case IEEE80211_RADIOTAP_RATE:
1961 rate = *iterator.this_arg;
1966 case IEEE80211_RADIOTAP_DATA_RETRIES:
1967 rate_retries = *iterator.this_arg;
1970 case IEEE80211_RADIOTAP_MCS:
1971 mcs_known = iterator.this_arg[0];
1972 mcs_flags = iterator.this_arg[1];
1973 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
1977 rate = iterator.this_arg[2];
1978 rate_flags = IEEE80211_TX_RC_MCS;
1980 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
1981 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
1982 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
1984 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
1985 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
1986 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
1987 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1990 case IEEE80211_RADIOTAP_VHT:
1991 vht_known = get_unaligned_le16(iterator.this_arg);
1994 rate_flags = IEEE80211_TX_RC_VHT_MCS;
1995 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
1996 (iterator.this_arg[2] &
1997 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
1998 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2000 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2001 if (iterator.this_arg[3] == 1)
2003 IEEE80211_TX_RC_40_MHZ_WIDTH;
2004 else if (iterator.this_arg[3] == 4)
2006 IEEE80211_TX_RC_80_MHZ_WIDTH;
2007 else if (iterator.this_arg[3] == 11)
2009 IEEE80211_TX_RC_160_MHZ_WIDTH;
2012 vht_mcs = iterator.this_arg[4] >> 4;
2013 vht_nss = iterator.this_arg[4] & 0xF;
2017 * Please update the file
2018 * Documentation/networking/mac80211-injection.txt
2019 * when parsing new fields here.
2027 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2031 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2033 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2034 info->control.rates[i].idx = -1;
2035 info->control.rates[i].flags = 0;
2036 info->control.rates[i].count = 0;
2039 if (rate_flags & IEEE80211_TX_RC_MCS) {
2040 info->control.rates[0].idx = rate;
2041 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2042 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2045 for (i = 0; i < sband->n_bitrates; i++) {
2046 if (rate * 5 != sband->bitrates[i].bitrate)
2049 info->control.rates[0].idx = i;
2054 if (info->control.rates[0].idx < 0)
2055 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2057 info->control.rates[0].flags = rate_flags;
2058 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2059 local->hw.max_rate_tries);
2063 * remove the radiotap header
2064 * iterator->_max_length was sanity-checked against
2065 * skb->len by iterator init
2067 skb_pull(skb, iterator._max_length);
2072 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2073 struct net_device *dev)
2075 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2076 struct ieee80211_chanctx_conf *chanctx_conf;
2077 struct ieee80211_radiotap_header *prthdr =
2078 (struct ieee80211_radiotap_header *)skb->data;
2079 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2080 struct ieee80211_hdr *hdr;
2081 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2082 struct cfg80211_chan_def *chandef;
2086 /* check for not even having the fixed radiotap header part */
2087 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2088 goto fail; /* too short to be possibly valid */
2090 /* is it a header version we can trust to find length from? */
2091 if (unlikely(prthdr->it_version))
2092 goto fail; /* only version 0 is supported */
2094 /* then there must be a radiotap header with a length we can use */
2095 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2097 /* does the skb contain enough to deliver on the alleged length? */
2098 if (unlikely(skb->len < len_rthdr))
2099 goto fail; /* skb too short for claimed rt header extent */
2102 * fix up the pointers accounting for the radiotap
2103 * header still being in there. We are being given
2104 * a precooked IEEE80211 header so no need for
2107 skb_set_mac_header(skb, len_rthdr);
2109 * these are just fixed to the end of the rt area since we
2110 * don't have any better information and at this point, nobody cares
2112 skb_set_network_header(skb, len_rthdr);
2113 skb_set_transport_header(skb, len_rthdr);
2115 if (skb->len < len_rthdr + 2)
2118 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2119 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2121 if (skb->len < len_rthdr + hdrlen)
2125 * Initialize skb->protocol if the injected frame is a data frame
2126 * carrying a rfc1042 header
2128 if (ieee80211_is_data(hdr->frame_control) &&
2129 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2130 u8 *payload = (u8 *)hdr + hdrlen;
2132 if (ether_addr_equal(payload, rfc1042_header))
2133 skb->protocol = cpu_to_be16((payload[6] << 8) |
2137 memset(info, 0, sizeof(*info));
2139 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2140 IEEE80211_TX_CTL_INJECTED;
2145 * We process outgoing injected frames that have a local address
2146 * we handle as though they are non-injected frames.
2147 * This code here isn't entirely correct, the local MAC address
2148 * isn't always enough to find the interface to use; for proper
2149 * VLAN/WDS support we will need a different mechanism (which
2150 * likely isn't going to be monitor interfaces).
2152 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2154 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2155 if (!ieee80211_sdata_running(tmp_sdata))
2157 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2158 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2159 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2161 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2167 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2168 if (!chanctx_conf) {
2169 tmp_sdata = rcu_dereference(local->monitor_sdata);
2172 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2176 chandef = &chanctx_conf->def;
2177 else if (!local->use_chanctx)
2178 chandef = &local->_oper_chandef;
2183 * Frame injection is not allowed if beaconing is not allowed
2184 * or if we need radar detection. Beaconing is usually not allowed when
2185 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2186 * Passive scan is also used in world regulatory domains where
2187 * your country is not known and as such it should be treated as
2188 * NO TX unless the channel is explicitly allowed in which case
2189 * your current regulatory domain would not have the passive scan
2192 * Since AP mode uses monitor interfaces to inject/TX management
2193 * frames we can make AP mode the exception to this rule once it
2194 * supports radar detection as its implementation can deal with
2195 * radar detection by itself. We can do that later by adding a
2196 * monitor flag interfaces used for AP support.
2198 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2202 info->band = chandef->chan->band;
2204 /* process and remove the injection radiotap header */
2205 if (!ieee80211_parse_tx_radiotap(local, skb))
2208 ieee80211_xmit(sdata, NULL, skb);
2211 return NETDEV_TX_OK;
2217 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2220 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2222 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2224 return ethertype == ETH_P_TDLS &&
2226 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2229 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2230 struct sk_buff *skb,
2231 struct sta_info **sta_out)
2233 struct sta_info *sta;
2235 switch (sdata->vif.type) {
2236 case NL80211_IFTYPE_AP_VLAN:
2237 sta = rcu_dereference(sdata->u.vlan.sta);
2241 } else if (sdata->wdev.use_4addr) {
2245 case NL80211_IFTYPE_AP:
2246 case NL80211_IFTYPE_OCB:
2247 case NL80211_IFTYPE_ADHOC:
2248 if (is_multicast_ether_addr(skb->data)) {
2249 *sta_out = ERR_PTR(-ENOENT);
2252 sta = sta_info_get_bss(sdata, skb->data);
2254 case NL80211_IFTYPE_WDS:
2255 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2257 #ifdef CONFIG_MAC80211_MESH
2258 case NL80211_IFTYPE_MESH_POINT:
2259 /* determined much later */
2263 case NL80211_IFTYPE_STATION:
2264 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2265 sta = sta_info_get(sdata, skb->data);
2267 bool tdls_peer, tdls_auth;
2269 tdls_peer = test_sta_flag(sta,
2270 WLAN_STA_TDLS_PEER);
2271 tdls_auth = test_sta_flag(sta,
2272 WLAN_STA_TDLS_PEER_AUTH);
2274 if (tdls_peer && tdls_auth) {
2280 * TDLS link during setup - throw out frames to
2281 * peer. Allow TDLS-setup frames to unauthorized
2282 * peers for the special case of a link teardown
2283 * after a TDLS sta is removed due to being
2286 if (tdls_peer && !tdls_auth &&
2287 !ieee80211_is_tdls_setup(skb))
2293 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2301 *sta_out = sta ?: ERR_PTR(-ENOENT);
2306 * ieee80211_build_hdr - build 802.11 header in the given frame
2307 * @sdata: virtual interface to build the header for
2308 * @skb: the skb to build the header in
2309 * @info_flags: skb flags to set
2311 * This function takes the skb with 802.3 header and reformats the header to
2312 * the appropriate IEEE 802.11 header based on which interface the packet is
2313 * being transmitted on.
2315 * Note that this function also takes care of the TX status request and
2316 * potential unsharing of the SKB - this needs to be interleaved with the
2319 * The function requires the read-side RCU lock held
2321 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2323 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2324 struct sk_buff *skb, u32 info_flags,
2325 struct sta_info *sta)
2327 struct ieee80211_local *local = sdata->local;
2328 struct ieee80211_tx_info *info;
2330 u16 ethertype, hdrlen, meshhdrlen = 0;
2332 struct ieee80211_hdr hdr;
2333 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2334 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2335 const u8 *encaps_data;
2336 int encaps_len, skip_header_bytes;
2337 bool wme_sta = false, authorized = false;
2341 struct ieee80211_chanctx_conf *chanctx_conf;
2342 struct ieee80211_sub_if_data *ap_sdata;
2343 enum nl80211_band band;
2349 /* convert Ethernet header to proper 802.11 header (based on
2350 * operation mode) */
2351 ethertype = (skb->data[12] << 8) | skb->data[13];
2352 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2354 switch (sdata->vif.type) {
2355 case NL80211_IFTYPE_AP_VLAN:
2356 if (sdata->wdev.use_4addr) {
2357 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2359 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2360 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2361 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2362 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2364 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2365 wme_sta = sta->sta.wme;
2367 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2369 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2370 if (!chanctx_conf) {
2374 band = chanctx_conf->def.chan->band;
2375 if (sdata->wdev.use_4addr)
2378 case NL80211_IFTYPE_AP:
2379 if (sdata->vif.type == NL80211_IFTYPE_AP)
2380 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2381 if (!chanctx_conf) {
2385 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2387 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2388 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2389 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2391 band = chanctx_conf->def.chan->band;
2393 case NL80211_IFTYPE_WDS:
2394 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2396 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2397 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2398 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2399 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2402 * This is the exception! WDS style interfaces are prohibited
2403 * when channel contexts are in used so this must be valid
2405 band = local->hw.conf.chandef.chan->band;
2407 #ifdef CONFIG_MAC80211_MESH
2408 case NL80211_IFTYPE_MESH_POINT:
2409 if (!is_multicast_ether_addr(skb->data)) {
2410 struct sta_info *next_hop;
2411 bool mpp_lookup = true;
2413 mpath = mesh_path_lookup(sdata, skb->data);
2416 next_hop = rcu_dereference(mpath->next_hop);
2418 !(mpath->flags & (MESH_PATH_ACTIVE |
2419 MESH_PATH_RESOLVING)))
2424 mppath = mpp_path_lookup(sdata, skb->data);
2426 mppath->exp_time = jiffies;
2429 if (mppath && mpath)
2430 mesh_path_del(sdata, mpath->dst);
2434 * Use address extension if it is a packet from
2435 * another interface or if we know the destination
2436 * is being proxied by a portal (i.e. portal address
2437 * differs from proxied address)
2439 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2440 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2441 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2442 skb->data, skb->data + ETH_ALEN);
2443 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2446 /* DS -> MBSS (802.11-2012 13.11.3.3).
2447 * For unicast with unknown forwarding information,
2448 * destination might be in the MBSS or if that fails
2449 * forwarded to another mesh gate. In either case
2450 * resolution will be handled in ieee80211_xmit(), so
2451 * leave the original DA. This also works for mcast */
2452 const u8 *mesh_da = skb->data;
2455 mesh_da = mppath->mpp;
2457 mesh_da = mpath->dst;
2459 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2460 mesh_da, sdata->vif.addr);
2461 if (is_multicast_ether_addr(mesh_da))
2462 /* DA TA mSA AE:SA */
2463 meshhdrlen = ieee80211_new_mesh_header(
2465 skb->data + ETH_ALEN, NULL);
2467 /* RA TA mDA mSA AE:DA SA */
2468 meshhdrlen = ieee80211_new_mesh_header(
2469 sdata, &mesh_hdr, skb->data,
2470 skb->data + ETH_ALEN);
2473 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2474 if (!chanctx_conf) {
2478 band = chanctx_conf->def.chan->band;
2481 case NL80211_IFTYPE_STATION:
2482 /* we already did checks when looking up the RA STA */
2483 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2487 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2488 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2489 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2491 } else if (sdata->u.mgd.use_4addr &&
2492 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2493 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2494 IEEE80211_FCTL_TODS);
2496 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2497 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2498 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2499 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2502 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2504 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2505 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2506 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2509 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2510 if (!chanctx_conf) {
2514 band = chanctx_conf->def.chan->band;
2516 case NL80211_IFTYPE_OCB:
2518 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2519 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2520 eth_broadcast_addr(hdr.addr3);
2522 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2523 if (!chanctx_conf) {
2527 band = chanctx_conf->def.chan->band;
2529 case NL80211_IFTYPE_ADHOC:
2531 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2532 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2533 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2535 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2536 if (!chanctx_conf) {
2540 band = chanctx_conf->def.chan->band;
2547 multicast = is_multicast_ether_addr(hdr.addr1);
2549 /* sta is always NULL for mesh */
2551 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2552 wme_sta = sta->sta.wme;
2553 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2554 /* For mesh, the use of the QoS header is mandatory */
2558 /* receiver does QoS (which also means we do) use it */
2560 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2565 * Drop unicast frames to unauthorised stations unless they are
2566 * EAPOL frames from the local station.
2568 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2569 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2570 !multicast && !authorized &&
2571 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2572 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2573 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2574 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2575 sdata->name, hdr.addr1);
2578 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2584 if (unlikely(!multicast && skb->sk &&
2585 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2586 struct sk_buff *ack_skb = skb_clone_sk(skb);
2589 unsigned long flags;
2592 spin_lock_irqsave(&local->ack_status_lock, flags);
2593 id = idr_alloc(&local->ack_status_frames, ack_skb,
2594 1, 0x10000, GFP_ATOMIC);
2595 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2599 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2607 * If the skb is shared we need to obtain our own copy.
2609 if (skb_shared(skb)) {
2610 struct sk_buff *tmp_skb = skb;
2612 /* can't happen -- skb is a clone if info_id != 0 */
2615 skb = skb_clone(skb, GFP_ATOMIC);
2624 hdr.frame_control = fc;
2625 hdr.duration_id = 0;
2628 skip_header_bytes = ETH_HLEN;
2629 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2630 encaps_data = bridge_tunnel_header;
2631 encaps_len = sizeof(bridge_tunnel_header);
2632 skip_header_bytes -= 2;
2633 } else if (ethertype >= ETH_P_802_3_MIN) {
2634 encaps_data = rfc1042_header;
2635 encaps_len = sizeof(rfc1042_header);
2636 skip_header_bytes -= 2;
2642 skb_pull(skb, skip_header_bytes);
2643 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2646 * So we need to modify the skb header and hence need a copy of
2647 * that. The head_need variable above doesn't, so far, include
2648 * the needed header space that we don't need right away. If we
2649 * can, then we don't reallocate right now but only after the
2650 * frame arrives at the master device (if it does...)
2652 * If we cannot, however, then we will reallocate to include all
2653 * the ever needed space. Also, if we need to reallocate it anyway,
2654 * make it big enough for everything we may ever need.
2657 if (head_need > 0 || skb_cloned(skb)) {
2658 head_need += sdata->encrypt_headroom;
2659 head_need += local->tx_headroom;
2660 head_need = max_t(int, 0, head_need);
2661 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2662 ieee80211_free_txskb(&local->hw, skb);
2664 return ERR_PTR(-ENOMEM);
2669 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2671 #ifdef CONFIG_MAC80211_MESH
2673 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2676 if (ieee80211_is_data_qos(fc)) {
2677 __le16 *qos_control;
2679 qos_control = (__le16 *) skb_push(skb, 2);
2680 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2682 * Maybe we could actually set some fields here, for now just
2683 * initialise to zero to indicate no special operation.
2687 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2689 skb_reset_mac_header(skb);
2691 info = IEEE80211_SKB_CB(skb);
2692 memset(info, 0, sizeof(*info));
2694 info->flags = info_flags;
2695 info->ack_frame_id = info_id;
2701 return ERR_PTR(ret);
2705 * fast-xmit overview
2707 * The core idea of this fast-xmit is to remove per-packet checks by checking
2708 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2709 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2710 * much less work can be done per packet. For example, fragmentation must be
2711 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2714 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2715 * header and other data to aid packet processing in ieee80211_xmit_fast().
2717 * The most difficult part of this is that when any of these assumptions
2718 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2719 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2720 * since the per-packet code no longer checks the conditions. This is reflected
2721 * by the calls to these functions throughout the rest of the code, and must be
2722 * maintained if any of the TX path checks change.
2725 void ieee80211_check_fast_xmit(struct sta_info *sta)
2727 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2728 struct ieee80211_local *local = sta->local;
2729 struct ieee80211_sub_if_data *sdata = sta->sdata;
2730 struct ieee80211_hdr *hdr = (void *)build.hdr;
2731 struct ieee80211_chanctx_conf *chanctx_conf;
2734 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2737 /* Locking here protects both the pointer itself, and against concurrent
2738 * invocations winning data access races to, e.g., the key pointer that
2740 * Without it, the invocation of this function right after the key
2741 * pointer changes wouldn't be sufficient, as another CPU could access
2742 * the pointer, then stall, and then do the cache update after the CPU
2743 * that invalidated the key.
2744 * With the locking, such scenarios cannot happen as the check for the
2745 * key and the fast-tx assignment are done atomically, so the CPU that
2746 * modifies the key will either wait or other one will see the key
2747 * cleared/changed already.
2749 spin_lock_bh(&sta->lock);
2750 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2751 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2752 sdata->vif.type == NL80211_IFTYPE_STATION)
2755 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2758 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2759 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2760 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2761 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2764 if (sdata->noack_map)
2767 /* fast-xmit doesn't handle fragmentation at all */
2768 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2769 !local->ops->set_frag_threshold)
2773 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2774 if (!chanctx_conf) {
2778 build.band = chanctx_conf->def.chan->band;
2781 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2783 switch (sdata->vif.type) {
2784 case NL80211_IFTYPE_ADHOC:
2786 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2787 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2788 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2791 case NL80211_IFTYPE_STATION:
2792 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2794 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2795 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2796 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2801 if (sdata->u.mgd.use_4addr) {
2802 /* non-regular ethertype cannot use the fastpath */
2803 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2804 IEEE80211_FCTL_TODS);
2806 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2807 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2808 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2809 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2813 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2815 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2816 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2817 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2820 case NL80211_IFTYPE_AP_VLAN:
2821 if (sdata->wdev.use_4addr) {
2822 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2823 IEEE80211_FCTL_TODS);
2825 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2826 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2827 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2828 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2833 case NL80211_IFTYPE_AP:
2834 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2836 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2837 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2838 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2842 /* not handled on fast-xmit */
2848 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2851 /* We store the key here so there's no point in using rcu_dereference()
2852 * but that's fine because the code that changes the pointers will call
2853 * this function after doing so. For a single CPU that would be enough,
2854 * for multiple see the comment above.
2856 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2858 build.key = rcu_access_pointer(sdata->default_unicast_key);
2860 bool gen_iv, iv_spc, mmic;
2862 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2863 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2864 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2866 /* don't handle software crypto */
2867 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2870 switch (build.key->conf.cipher) {
2871 case WLAN_CIPHER_SUITE_CCMP:
2872 case WLAN_CIPHER_SUITE_CCMP_256:
2873 /* add fixed key ID */
2875 (build.hdr + build.hdr_len)[3] =
2876 0x20 | (build.key->conf.keyidx << 6);
2877 build.pn_offs = build.hdr_len;
2879 if (gen_iv || iv_spc)
2880 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2882 case WLAN_CIPHER_SUITE_GCMP:
2883 case WLAN_CIPHER_SUITE_GCMP_256:
2884 /* add fixed key ID */
2886 (build.hdr + build.hdr_len)[3] =
2887 0x20 | (build.key->conf.keyidx << 6);
2888 build.pn_offs = build.hdr_len;
2890 if (gen_iv || iv_spc)
2891 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2893 case WLAN_CIPHER_SUITE_TKIP:
2894 /* cannot handle MMIC or IV generation in xmit-fast */
2898 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2900 case WLAN_CIPHER_SUITE_WEP40:
2901 case WLAN_CIPHER_SUITE_WEP104:
2902 /* cannot handle IV generation in fast-xmit */
2906 build.hdr_len += IEEE80211_WEP_IV_LEN;
2908 case WLAN_CIPHER_SUITE_AES_CMAC:
2909 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2910 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2911 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2913 "management cipher suite 0x%x enabled for data\n",
2914 build.key->conf.cipher);
2917 /* we don't know how to generate IVs for this at all */
2918 if (WARN_ON(gen_iv))
2920 /* pure hardware keys are OK, of course */
2921 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2923 /* cipher scheme might require space allocation */
2925 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2928 build.hdr_len += build.key->conf.iv_len;
2931 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2934 hdr->frame_control = fc;
2936 memcpy(build.hdr + build.hdr_len,
2937 rfc1042_header, sizeof(rfc1042_header));
2938 build.hdr_len += sizeof(rfc1042_header);
2940 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2941 /* if the kmemdup fails, continue w/o fast_tx */
2946 /* we might have raced against another call to this function */
2947 old = rcu_dereference_protected(sta->fast_tx,
2948 lockdep_is_held(&sta->lock));
2949 rcu_assign_pointer(sta->fast_tx, fast_tx);
2951 kfree_rcu(old, rcu_head);
2952 spin_unlock_bh(&sta->lock);
2955 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2957 struct sta_info *sta;
2960 list_for_each_entry_rcu(sta, &local->sta_list, list)
2961 ieee80211_check_fast_xmit(sta);
2965 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2967 struct ieee80211_local *local = sdata->local;
2968 struct sta_info *sta;
2972 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2973 if (sdata != sta->sdata &&
2974 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
2976 ieee80211_check_fast_xmit(sta);
2982 void ieee80211_clear_fast_xmit(struct sta_info *sta)
2984 struct ieee80211_fast_tx *fast_tx;
2986 spin_lock_bh(&sta->lock);
2987 fast_tx = rcu_dereference_protected(sta->fast_tx,
2988 lockdep_is_held(&sta->lock));
2989 RCU_INIT_POINTER(sta->fast_tx, NULL);
2990 spin_unlock_bh(&sta->lock);
2993 kfree_rcu(fast_tx, rcu_head);
2996 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
2997 struct sk_buff *skb, int headroom,
3000 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
3001 int padding = (4 - amsdu_len) & 3;
3003 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3004 I802_DEBUG_INC(local->tx_expand_skb_head);
3006 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3007 wiphy_debug(local->hw.wiphy,
3008 "failed to reallocate TX buffer\n");
3014 *subframe_len += padding;
3015 memset(skb_put(skb, padding), 0, padding);
3021 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3022 struct ieee80211_fast_tx *fast_tx,
3023 struct sk_buff *skb)
3025 struct ieee80211_local *local = sdata->local;
3026 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3027 struct ieee80211_hdr *hdr;
3028 struct ethhdr amsdu_hdr;
3029 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3030 int subframe_len = skb->len - hdr_len;
3034 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3037 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3040 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(amsdu_hdr),
3044 amsdu_hdr.h_proto = cpu_to_be16(subframe_len);
3045 memcpy(amsdu_hdr.h_source, skb->data + fast_tx->sa_offs, ETH_ALEN);
3046 memcpy(amsdu_hdr.h_dest, skb->data + fast_tx->da_offs, ETH_ALEN);
3048 data = skb_push(skb, sizeof(amsdu_hdr));
3049 memmove(data, data + sizeof(amsdu_hdr), hdr_len);
3050 memcpy(data + hdr_len, &amsdu_hdr, sizeof(amsdu_hdr));
3053 qc = ieee80211_get_qos_ctl(hdr);
3054 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3056 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3061 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3062 struct sta_info *sta,
3063 struct ieee80211_fast_tx *fast_tx,
3064 struct sk_buff *skb)
3066 struct ieee80211_local *local = sdata->local;
3067 struct fq *fq = &local->fq;
3069 struct fq_flow *flow;
3070 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3071 struct ieee80211_txq *txq = sta->sta.txq[tid];
3072 struct txq_info *txqi;
3073 struct sk_buff **frag_tail, *head;
3074 int subframe_len = skb->len - ETH_ALEN;
3075 u8 max_subframes = sta->sta.max_amsdu_subframes;
3076 int max_frags = local->hw.max_tx_fragments;
3077 int max_amsdu_len = sta->sta.max_amsdu_len;
3081 unsigned int orig_len;
3084 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3090 txqi = to_txq_info(txq);
3091 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3094 if (sta->sta.max_rc_amsdu_len)
3095 max_amsdu_len = min_t(int, max_amsdu_len,
3096 sta->sta.max_rc_amsdu_len);
3098 spin_lock_bh(&fq->lock);
3100 /* TODO: Ideally aggregation should be done on dequeue to remain
3101 * responsive to environment changes.
3105 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3106 head = skb_peek_tail(&flow->queue);
3110 orig_len = head->len;
3112 if (skb->len + head->len > max_amsdu_len)
3115 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3118 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3119 nfrags += 1 + skb_shinfo(head)->nr_frags;
3120 frag_tail = &skb_shinfo(head)->frag_list;
3121 while (*frag_tail) {
3122 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3123 frag_tail = &(*frag_tail)->next;
3127 if (max_subframes && n > max_subframes)
3130 if (max_frags && nfrags > max_frags)
3133 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3138 data = skb_push(skb, ETH_ALEN + 2);
3139 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3141 data += 2 * ETH_ALEN;
3142 len = cpu_to_be16(subframe_len);
3143 memcpy(data, &len, 2);
3144 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3146 head->len += skb->len;
3147 head->data_len += skb->len;
3150 flow->backlog += head->len - orig_len;
3151 tin->backlog_bytes += head->len - orig_len;
3153 fq_recalc_backlog(fq, tin, flow);
3156 spin_unlock_bh(&fq->lock);
3161 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3162 struct net_device *dev, struct sta_info *sta,
3163 struct ieee80211_fast_tx *fast_tx,
3164 struct sk_buff *skb)
3166 struct ieee80211_local *local = sdata->local;
3167 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3168 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3169 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3171 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3172 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3173 struct ieee80211_tx_data tx;
3174 ieee80211_tx_result r;
3175 struct tid_ampdu_tx *tid_tx = NULL;
3176 u8 tid = IEEE80211_NUM_TIDS;
3178 /* control port protocol needs a lot of special handling */
3179 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3182 /* only RFC 1042 SNAP */
3183 if (ethertype < ETH_P_802_3_MIN)
3186 /* don't handle TX status request here either */
3187 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3190 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3191 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3192 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3194 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3196 if (tid_tx->timeout)
3197 tid_tx->last_tx = jiffies;
3201 /* after this point (skb is modified) we cannot return false */
3203 if (skb_shared(skb)) {
3204 struct sk_buff *tmp_skb = skb;
3206 skb = skb_clone(skb, GFP_ATOMIC);
3213 ieee80211_tx_stats(dev, skb->len + extra_head);
3215 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3216 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3219 /* will not be crypto-handled beyond what we do here, so use false
3220 * as the may-encrypt argument for the resize to not account for
3221 * more room than we already have in 'extra_head'
3223 if (unlikely(ieee80211_skb_resize(sdata, skb,
3224 max_t(int, extra_head + hw_headroom -
3225 skb_headroom(skb), 0),
3231 memcpy(ð, skb->data, ETH_HLEN - 2);
3232 hdr = (void *)skb_push(skb, extra_head);
3233 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3234 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3235 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3237 memset(info, 0, sizeof(*info));
3238 info->band = fast_tx->band;
3239 info->control.vif = &sdata->vif;
3240 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3241 IEEE80211_TX_CTL_DONTFRAG |
3242 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3244 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3245 *ieee80211_get_qos_ctl(hdr) = tid;
3246 if (!sta->sta.txq[0])
3247 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3249 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3250 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3251 sdata->sequence_number += 0x10;
3254 if (skb_shinfo(skb)->gso_size)
3255 sta->tx_stats.msdu[tid] +=
3256 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3258 sta->tx_stats.msdu[tid]++;
3260 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3262 __skb_queue_head_init(&tx.skbs);
3264 tx.flags = IEEE80211_TX_UNICAST;
3268 tx.key = fast_tx->key;
3271 info->control.hw_key = &fast_tx->key->conf;
3273 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3275 r = ieee80211_tx_h_rate_ctrl(&tx);
3279 if (r != TX_CONTINUE) {
3286 /* statistics normally done by ieee80211_tx_h_stats (but that
3287 * has to consider fragmentation, so is more complex)
3289 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3290 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3292 if (fast_tx->pn_offs) {
3294 u8 *crypto_hdr = skb->data + fast_tx->pn_offs;
3296 switch (fast_tx->key->conf.cipher) {
3297 case WLAN_CIPHER_SUITE_CCMP:
3298 case WLAN_CIPHER_SUITE_CCMP_256:
3299 case WLAN_CIPHER_SUITE_GCMP:
3300 case WLAN_CIPHER_SUITE_GCMP_256:
3301 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
3303 crypto_hdr[1] = pn >> 8;
3304 crypto_hdr[4] = pn >> 16;
3305 crypto_hdr[5] = pn >> 24;
3306 crypto_hdr[6] = pn >> 32;
3307 crypto_hdr[7] = pn >> 40;
3312 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3313 sdata = container_of(sdata->bss,
3314 struct ieee80211_sub_if_data, u.ap);
3316 __skb_queue_tail(&tx.skbs, skb);
3317 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3321 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3322 struct net_device *dev,
3325 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3326 struct sta_info *sta;
3327 struct sk_buff *next;
3329 if (unlikely(skb->len < ETH_HLEN)) {
3336 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3339 if (!IS_ERR_OR_NULL(sta)) {
3340 struct ieee80211_fast_tx *fast_tx;
3342 fast_tx = rcu_dereference(sta->fast_tx);
3345 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
3349 if (skb_is_gso(skb)) {
3350 struct sk_buff *segs;
3352 segs = skb_gso_segment(skb, 0);
3360 /* we cannot process non-linear frames on this path */
3361 if (skb_linearize(skb)) {
3366 /* the frame could be fragmented, software-encrypted, and other
3367 * things so we cannot really handle checksum offload with it -
3368 * fix it up in software before we handle anything else.
3370 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3371 skb_set_transport_header(skb,
3372 skb_checksum_start_offset(skb));
3373 if (skb_checksum_help(skb))
3386 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3390 ieee80211_tx_stats(dev, skb->len);
3392 ieee80211_xmit(sdata, sta, skb);
3402 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3403 * @skb: packet to be sent
3404 * @dev: incoming interface
3406 * On failure skb will be freed.
3408 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3409 struct net_device *dev)
3411 __ieee80211_subif_start_xmit(skb, dev, 0);
3412 return NETDEV_TX_OK;
3416 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3417 struct sk_buff *skb, u32 info_flags)
3419 struct ieee80211_hdr *hdr;
3420 struct ieee80211_tx_data tx = {
3421 .local = sdata->local,
3424 struct sta_info *sta;
3428 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3430 skb = ERR_PTR(-EINVAL);
3434 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3438 hdr = (void *)skb->data;
3439 tx.sta = sta_info_get(sdata, hdr->addr1);
3442 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3445 return ERR_PTR(-EINVAL);
3454 * ieee80211_clear_tx_pending may not be called in a context where
3455 * it is possible that it packets could come in again.
3457 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3459 struct sk_buff *skb;
3462 for (i = 0; i < local->hw.queues; i++) {
3463 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3464 ieee80211_free_txskb(&local->hw, skb);
3469 * Returns false if the frame couldn't be transmitted but was queued instead,
3470 * which in this case means re-queued -- take as an indication to stop sending
3471 * more pending frames.
3473 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3474 struct sk_buff *skb)
3476 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3477 struct ieee80211_sub_if_data *sdata;
3478 struct sta_info *sta;
3479 struct ieee80211_hdr *hdr;
3481 struct ieee80211_chanctx_conf *chanctx_conf;
3483 sdata = vif_to_sdata(info->control.vif);
3485 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3486 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3487 if (unlikely(!chanctx_conf)) {
3491 info->band = chanctx_conf->def.chan->band;
3492 result = ieee80211_tx(sdata, NULL, skb, true);
3494 struct sk_buff_head skbs;
3496 __skb_queue_head_init(&skbs);
3497 __skb_queue_tail(&skbs, skb);
3499 hdr = (struct ieee80211_hdr *)skb->data;
3500 sta = sta_info_get(sdata, hdr->addr1);
3502 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3509 * Transmit all pending packets. Called from tasklet.
3511 void ieee80211_tx_pending(unsigned long data)
3513 struct ieee80211_local *local = (struct ieee80211_local *)data;
3514 unsigned long flags;
3520 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3521 for (i = 0; i < local->hw.queues; i++) {
3523 * If queue is stopped by something other than due to pending
3524 * frames, or we have no pending frames, proceed to next queue.
3526 if (local->queue_stop_reasons[i] ||
3527 skb_queue_empty(&local->pending[i]))
3530 while (!skb_queue_empty(&local->pending[i])) {
3531 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3532 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3534 if (WARN_ON(!info->control.vif)) {
3535 ieee80211_free_txskb(&local->hw, skb);
3539 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3542 txok = ieee80211_tx_pending_skb(local, skb);
3543 spin_lock_irqsave(&local->queue_stop_reason_lock,
3549 if (skb_queue_empty(&local->pending[i]))
3550 ieee80211_propagate_queue_wake(local, i);
3552 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3557 /* functions for drivers to get certain frames */
3559 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3560 struct ps_data *ps, struct sk_buff *skb,
3565 int i, have_bits = 0, n1, n2;
3567 /* Generate bitmap for TIM only if there are any STAs in power save
3569 if (atomic_read(&ps->num_sta_ps) > 0)
3570 /* in the hope that this is faster than
3571 * checking byte-for-byte */
3572 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3573 IEEE80211_MAX_AID+1);
3575 if (ps->dtim_count == 0)
3576 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3581 tim = pos = (u8 *) skb_put(skb, 6);
3582 *pos++ = WLAN_EID_TIM;
3584 *pos++ = ps->dtim_count;
3585 *pos++ = sdata->vif.bss_conf.dtim_period;
3587 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3590 ps->dtim_bc_mc = aid0 == 1;
3593 /* Find largest even number N1 so that bits numbered 1 through
3594 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3595 * (N2 + 1) x 8 through 2007 are 0. */
3597 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3604 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3611 /* Bitmap control */
3613 /* Part Virt Bitmap */
3614 skb_put(skb, n2 - n1);
3615 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3617 tim[1] = n2 - n1 + 4;
3619 *pos++ = aid0; /* Bitmap control */
3620 *pos++ = 0; /* Part Virt Bitmap */
3624 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3625 struct ps_data *ps, struct sk_buff *skb,
3628 struct ieee80211_local *local = sdata->local;
3631 * Not very nice, but we want to allow the driver to call
3632 * ieee80211_beacon_get() as a response to the set_tim()
3633 * callback. That, however, is already invoked under the
3634 * sta_lock to guarantee consistent and race-free update
3635 * of the tim bitmap in mac80211 and the driver.
3637 if (local->tim_in_locked_section) {
3638 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3640 spin_lock_bh(&local->tim_lock);
3641 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3642 spin_unlock_bh(&local->tim_lock);
3648 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3649 struct beacon_data *beacon)
3651 struct probe_resp *resp;
3653 size_t beacon_data_len;
3655 u8 count = beacon->csa_current_counter;
3657 switch (sdata->vif.type) {
3658 case NL80211_IFTYPE_AP:
3659 beacon_data = beacon->tail;
3660 beacon_data_len = beacon->tail_len;
3662 case NL80211_IFTYPE_ADHOC:
3663 beacon_data = beacon->head;
3664 beacon_data_len = beacon->head_len;
3666 case NL80211_IFTYPE_MESH_POINT:
3667 beacon_data = beacon->head;
3668 beacon_data_len = beacon->head_len;
3675 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3676 resp = rcu_dereference(sdata->u.ap.probe_resp);
3678 if (beacon->csa_counter_offsets[i]) {
3679 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3685 beacon_data[beacon->csa_counter_offsets[i]] = count;
3688 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3689 resp->data[resp->csa_counter_offsets[i]] = count;
3694 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3696 beacon->csa_current_counter--;
3698 /* the counter should never reach 0 */
3699 WARN_ON_ONCE(!beacon->csa_current_counter);
3701 return beacon->csa_current_counter;
3704 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3706 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3707 struct beacon_data *beacon = NULL;
3712 if (sdata->vif.type == NL80211_IFTYPE_AP)
3713 beacon = rcu_dereference(sdata->u.ap.beacon);
3714 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3715 beacon = rcu_dereference(sdata->u.ibss.presp);
3716 else if (ieee80211_vif_is_mesh(&sdata->vif))
3717 beacon = rcu_dereference(sdata->u.mesh.beacon);
3722 count = __ieee80211_csa_update_counter(beacon);
3728 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3730 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3732 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3733 struct beacon_data *beacon = NULL;
3735 size_t beacon_data_len;
3738 if (!ieee80211_sdata_running(sdata))
3742 if (vif->type == NL80211_IFTYPE_AP) {
3743 struct ieee80211_if_ap *ap = &sdata->u.ap;
3745 beacon = rcu_dereference(ap->beacon);
3746 if (WARN_ON(!beacon || !beacon->tail))
3748 beacon_data = beacon->tail;
3749 beacon_data_len = beacon->tail_len;
3750 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3751 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3753 beacon = rcu_dereference(ifibss->presp);
3757 beacon_data = beacon->head;
3758 beacon_data_len = beacon->head_len;
3759 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3760 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3762 beacon = rcu_dereference(ifmsh->beacon);
3766 beacon_data = beacon->head;
3767 beacon_data_len = beacon->head_len;
3773 if (!beacon->csa_counter_offsets[0])
3776 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3779 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3786 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3788 static struct sk_buff *
3789 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3790 struct ieee80211_vif *vif,
3791 struct ieee80211_mutable_offsets *offs,
3794 struct ieee80211_local *local = hw_to_local(hw);
3795 struct beacon_data *beacon = NULL;
3796 struct sk_buff *skb = NULL;
3797 struct ieee80211_tx_info *info;
3798 struct ieee80211_sub_if_data *sdata = NULL;
3799 enum nl80211_band band;
3800 struct ieee80211_tx_rate_control txrc;
3801 struct ieee80211_chanctx_conf *chanctx_conf;
3802 int csa_off_base = 0;
3806 sdata = vif_to_sdata(vif);
3807 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3809 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3813 memset(offs, 0, sizeof(*offs));
3815 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3816 struct ieee80211_if_ap *ap = &sdata->u.ap;
3818 beacon = rcu_dereference(ap->beacon);
3820 if (beacon->csa_counter_offsets[0]) {
3822 __ieee80211_csa_update_counter(beacon);
3824 ieee80211_set_csa(sdata, beacon);
3828 * headroom, head length,
3829 * tail length and maximum TIM length
3831 skb = dev_alloc_skb(local->tx_headroom +
3833 beacon->tail_len + 256 +
3834 local->hw.extra_beacon_tailroom);
3838 skb_reserve(skb, local->tx_headroom);
3839 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3842 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3846 offs->tim_offset = beacon->head_len;
3847 offs->tim_length = skb->len - beacon->head_len;
3849 /* for AP the csa offsets are from tail */
3850 csa_off_base = skb->len;
3854 memcpy(skb_put(skb, beacon->tail_len),
3855 beacon->tail, beacon->tail_len);
3858 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
3859 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3860 struct ieee80211_hdr *hdr;
3862 beacon = rcu_dereference(ifibss->presp);
3866 if (beacon->csa_counter_offsets[0]) {
3868 __ieee80211_csa_update_counter(beacon);
3870 ieee80211_set_csa(sdata, beacon);
3873 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
3874 local->hw.extra_beacon_tailroom);
3877 skb_reserve(skb, local->tx_headroom);
3878 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3881 hdr = (struct ieee80211_hdr *) skb->data;
3882 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3883 IEEE80211_STYPE_BEACON);
3884 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3885 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3887 beacon = rcu_dereference(ifmsh->beacon);
3891 if (beacon->csa_counter_offsets[0]) {
3893 /* TODO: For mesh csa_counter is in TU, so
3894 * decrementing it by one isn't correct, but
3895 * for now we leave it consistent with overall
3896 * mac80211's behavior.
3898 __ieee80211_csa_update_counter(beacon);
3900 ieee80211_set_csa(sdata, beacon);
3903 if (ifmsh->sync_ops)
3904 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
3906 skb = dev_alloc_skb(local->tx_headroom +
3910 local->hw.extra_beacon_tailroom);
3913 skb_reserve(skb, local->tx_headroom);
3914 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3916 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
3919 offs->tim_offset = beacon->head_len;
3920 offs->tim_length = skb->len - beacon->head_len;
3923 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
3931 if (offs && beacon) {
3934 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
3935 u16 csa_off = beacon->csa_counter_offsets[i];
3940 offs->csa_counter_offs[i] = csa_off_base + csa_off;
3944 band = chanctx_conf->def.chan->band;
3946 info = IEEE80211_SKB_CB(skb);
3948 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
3949 info->flags |= IEEE80211_TX_CTL_NO_ACK;
3952 memset(&txrc, 0, sizeof(txrc));
3954 txrc.sband = local->hw.wiphy->bands[band];
3955 txrc.bss_conf = &sdata->vif.bss_conf;
3957 txrc.reported_rate.idx = -1;
3958 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
3959 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
3960 txrc.max_rate_idx = -1;
3962 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
3964 rate_control_get_rate(sdata, NULL, &txrc);
3966 info->control.vif = vif;
3968 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
3969 IEEE80211_TX_CTL_ASSIGN_SEQ |
3970 IEEE80211_TX_CTL_FIRST_FRAGMENT;
3978 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
3979 struct ieee80211_vif *vif,
3980 struct ieee80211_mutable_offsets *offs)
3982 return __ieee80211_beacon_get(hw, vif, offs, true);
3984 EXPORT_SYMBOL(ieee80211_beacon_get_template);
3986 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
3987 struct ieee80211_vif *vif,
3988 u16 *tim_offset, u16 *tim_length)
3990 struct ieee80211_mutable_offsets offs = {};
3991 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
3992 struct sk_buff *copy;
3993 struct ieee80211_supported_band *sband;
4000 *tim_offset = offs.tim_offset;
4003 *tim_length = offs.tim_length;
4005 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4006 !hw_to_local(hw)->monitors)
4009 /* send a copy to monitor interfaces */
4010 copy = skb_copy(bcn, GFP_ATOMIC);
4014 shift = ieee80211_vif_get_shift(vif);
4015 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
4016 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4020 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4022 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4023 struct ieee80211_vif *vif)
4025 struct ieee80211_if_ap *ap = NULL;
4026 struct sk_buff *skb = NULL;
4027 struct probe_resp *presp = NULL;
4028 struct ieee80211_hdr *hdr;
4029 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4031 if (sdata->vif.type != NL80211_IFTYPE_AP)
4037 presp = rcu_dereference(ap->probe_resp);
4041 skb = dev_alloc_skb(presp->len);
4045 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
4047 hdr = (struct ieee80211_hdr *) skb->data;
4048 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4054 EXPORT_SYMBOL(ieee80211_proberesp_get);
4056 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4057 struct ieee80211_vif *vif)
4059 struct ieee80211_sub_if_data *sdata;
4060 struct ieee80211_if_managed *ifmgd;
4061 struct ieee80211_pspoll *pspoll;
4062 struct ieee80211_local *local;
4063 struct sk_buff *skb;
4065 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4068 sdata = vif_to_sdata(vif);
4069 ifmgd = &sdata->u.mgd;
4070 local = sdata->local;
4072 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4076 skb_reserve(skb, local->hw.extra_tx_headroom);
4078 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
4079 memset(pspoll, 0, sizeof(*pspoll));
4080 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4081 IEEE80211_STYPE_PSPOLL);
4082 pspoll->aid = cpu_to_le16(ifmgd->aid);
4084 /* aid in PS-Poll has its two MSBs each set to 1 */
4085 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4087 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4088 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4092 EXPORT_SYMBOL(ieee80211_pspoll_get);
4094 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4095 struct ieee80211_vif *vif)
4097 struct ieee80211_hdr_3addr *nullfunc;
4098 struct ieee80211_sub_if_data *sdata;
4099 struct ieee80211_if_managed *ifmgd;
4100 struct ieee80211_local *local;
4101 struct sk_buff *skb;
4103 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4106 sdata = vif_to_sdata(vif);
4107 ifmgd = &sdata->u.mgd;
4108 local = sdata->local;
4110 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
4114 skb_reserve(skb, local->hw.extra_tx_headroom);
4116 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
4118 memset(nullfunc, 0, sizeof(*nullfunc));
4119 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4120 IEEE80211_STYPE_NULLFUNC |
4121 IEEE80211_FCTL_TODS);
4122 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4123 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4124 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4128 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4130 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4132 const u8 *ssid, size_t ssid_len,
4135 struct ieee80211_local *local = hw_to_local(hw);
4136 struct ieee80211_hdr_3addr *hdr;
4137 struct sk_buff *skb;
4141 ie_ssid_len = 2 + ssid_len;
4143 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4144 ie_ssid_len + tailroom);
4148 skb_reserve(skb, local->hw.extra_tx_headroom);
4150 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
4151 memset(hdr, 0, sizeof(*hdr));
4152 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4153 IEEE80211_STYPE_PROBE_REQ);
4154 eth_broadcast_addr(hdr->addr1);
4155 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4156 eth_broadcast_addr(hdr->addr3);
4158 pos = skb_put(skb, ie_ssid_len);
4159 *pos++ = WLAN_EID_SSID;
4162 memcpy(pos, ssid, ssid_len);
4167 EXPORT_SYMBOL(ieee80211_probereq_get);
4169 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4170 const void *frame, size_t frame_len,
4171 const struct ieee80211_tx_info *frame_txctl,
4172 struct ieee80211_rts *rts)
4174 const struct ieee80211_hdr *hdr = frame;
4176 rts->frame_control =
4177 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4178 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4180 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4181 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4183 EXPORT_SYMBOL(ieee80211_rts_get);
4185 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4186 const void *frame, size_t frame_len,
4187 const struct ieee80211_tx_info *frame_txctl,
4188 struct ieee80211_cts *cts)
4190 const struct ieee80211_hdr *hdr = frame;
4192 cts->frame_control =
4193 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4194 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4195 frame_len, frame_txctl);
4196 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4198 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4201 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4202 struct ieee80211_vif *vif)
4204 struct ieee80211_local *local = hw_to_local(hw);
4205 struct sk_buff *skb = NULL;
4206 struct ieee80211_tx_data tx;
4207 struct ieee80211_sub_if_data *sdata;
4209 struct ieee80211_tx_info *info;
4210 struct ieee80211_chanctx_conf *chanctx_conf;
4212 sdata = vif_to_sdata(vif);
4215 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4220 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4221 struct beacon_data *beacon =
4222 rcu_dereference(sdata->u.ap.beacon);
4224 if (!beacon || !beacon->head)
4227 ps = &sdata->u.ap.ps;
4228 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4229 ps = &sdata->u.mesh.ps;
4234 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4235 goto out; /* send buffered bc/mc only after DTIM beacon */
4238 skb = skb_dequeue(&ps->bc_buf);
4241 local->total_ps_buffered--;
4243 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4244 struct ieee80211_hdr *hdr =
4245 (struct ieee80211_hdr *) skb->data;
4246 /* more buffered multicast/broadcast frames ==> set
4247 * MoreData flag in IEEE 802.11 header to inform PS
4249 hdr->frame_control |=
4250 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4253 if (sdata->vif.type == NL80211_IFTYPE_AP)
4254 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4255 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4257 ieee80211_free_txskb(hw, skb);
4260 info = IEEE80211_SKB_CB(skb);
4262 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4263 info->band = chanctx_conf->def.chan->band;
4265 if (invoke_tx_handlers(&tx))
4272 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4274 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4276 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4277 struct ieee80211_sub_if_data *sdata = sta->sdata;
4278 struct ieee80211_local *local = sdata->local;
4282 lockdep_assert_held(&local->sta_mtx);
4284 /* only some cases are supported right now */
4285 switch (sdata->vif.type) {
4286 case NL80211_IFTYPE_STATION:
4287 case NL80211_IFTYPE_AP:
4288 case NL80211_IFTYPE_AP_VLAN:
4295 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4298 if (sta->reserved_tid == tid) {
4303 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4304 sdata_err(sdata, "TID reservation already active\n");
4309 ieee80211_stop_vif_queues(sdata->local, sdata,
4310 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4314 /* Tear down BA sessions so we stop aggregating on this TID */
4315 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4316 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4317 __ieee80211_stop_tx_ba_session(sta, tid,
4318 AGG_STOP_LOCAL_REQUEST);
4321 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4322 __ieee80211_flush_queues(local, sdata, queues, false);
4324 sta->reserved_tid = tid;
4326 ieee80211_wake_vif_queues(local, sdata,
4327 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4329 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4330 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4336 EXPORT_SYMBOL(ieee80211_reserve_tid);
4338 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4340 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4341 struct ieee80211_sub_if_data *sdata = sta->sdata;
4343 lockdep_assert_held(&sdata->local->sta_mtx);
4345 /* only some cases are supported right now */
4346 switch (sdata->vif.type) {
4347 case NL80211_IFTYPE_STATION:
4348 case NL80211_IFTYPE_AP:
4349 case NL80211_IFTYPE_AP_VLAN:
4356 if (tid != sta->reserved_tid) {
4357 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4361 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4363 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4365 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4366 struct sk_buff *skb, int tid,
4367 enum nl80211_band band)
4369 int ac = ieee802_1d_to_ac[tid & 7];
4371 skb_reset_mac_header(skb);
4372 skb_set_queue_mapping(skb, ac);
4373 skb->priority = tid;
4375 skb->dev = sdata->dev;
4378 * The other path calling ieee80211_xmit is from the tasklet,
4379 * and while we can handle concurrent transmissions locking
4380 * requirements are that we do not come into tx with bhs on.
4383 IEEE80211_SKB_CB(skb)->band = band;
4384 ieee80211_xmit(sdata, NULL, skb);