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 struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
800 struct ieee80211_vif *vif,
801 struct ieee80211_sta *pubsta,
804 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
805 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
806 struct ieee80211_txq *txq = NULL;
808 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
809 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
812 if (!ieee80211_is_data(hdr->frame_control))
816 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
818 txq = pubsta->txq[tid];
826 return to_txq_info(txq);
829 static ieee80211_tx_result debug_noinline
830 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
832 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
833 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
838 * Packet injection may want to control the sequence
839 * number, if we have no matching interface then we
840 * neither assign one ourselves nor ask the driver to.
842 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
845 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
848 if (ieee80211_hdrlen(hdr->frame_control) < 24)
851 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
855 * Anything but QoS data that has a sequence number field
856 * (is long enough) gets a sequence number from the global
857 * counter. QoS data frames with a multicast destination
858 * also use the global counter (802.11-2012 9.3.2.10).
860 if (!ieee80211_is_data_qos(hdr->frame_control) ||
861 is_multicast_ether_addr(hdr->addr1)) {
862 /* driver should assign sequence number */
863 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
864 /* for pure STA mode without beacons, we can do it */
865 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
866 tx->sdata->sequence_number += 0x10;
868 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
873 * This should be true for injected/management frames only, for
874 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
875 * above since they are not QoS-data frames.
880 /* include per-STA, per-TID sequence counter */
882 qc = ieee80211_get_qos_ctl(hdr);
883 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
884 tx->sta->tx_stats.msdu[tid]++;
886 if (!ieee80211_get_txq(tx->local, info->control.vif, &tx->sta->sta,
888 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
893 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
894 struct sk_buff *skb, int hdrlen,
897 struct ieee80211_local *local = tx->local;
898 struct ieee80211_tx_info *info;
900 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
901 int pos = hdrlen + per_fragm;
902 int rem = skb->len - hdrlen - per_fragm;
904 if (WARN_ON(rem < 0))
907 /* first fragment was already added to queue by caller */
910 int fraglen = per_fragm;
915 tmp = dev_alloc_skb(local->tx_headroom +
917 tx->sdata->encrypt_headroom +
918 IEEE80211_ENCRYPT_TAILROOM);
922 __skb_queue_tail(&tx->skbs, tmp);
925 local->tx_headroom + tx->sdata->encrypt_headroom);
927 /* copy control information */
928 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
930 info = IEEE80211_SKB_CB(tmp);
931 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
932 IEEE80211_TX_CTL_FIRST_FRAGMENT);
935 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
937 skb_copy_queue_mapping(tmp, skb);
938 tmp->priority = skb->priority;
941 /* copy header and data */
942 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
943 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
948 /* adjust first fragment's length */
949 skb_trim(skb, hdrlen + per_fragm);
953 static ieee80211_tx_result debug_noinline
954 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
956 struct sk_buff *skb = tx->skb;
957 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
958 struct ieee80211_hdr *hdr = (void *)skb->data;
959 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
963 /* no matter what happens, tx->skb moves to tx->skbs */
964 __skb_queue_tail(&tx->skbs, skb);
967 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
970 if (tx->local->ops->set_frag_threshold)
974 * Warn when submitting a fragmented A-MPDU frame and drop it.
975 * This scenario is handled in ieee80211_tx_prepare but extra
976 * caution taken here as fragmented ampdu may cause Tx stop.
978 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
981 hdrlen = ieee80211_hdrlen(hdr->frame_control);
983 /* internal error, why isn't DONTFRAG set? */
984 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
988 * Now fragment the frame. This will allocate all the fragments and
989 * chain them (using skb as the first fragment) to skb->next.
990 * During transmission, we will remove the successfully transmitted
991 * fragments from this list. When the low-level driver rejects one
992 * of the fragments then we will simply pretend to accept the skb
993 * but store it away as pending.
995 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
998 /* update duration/seq/flags of fragments */
1001 skb_queue_walk(&tx->skbs, skb) {
1002 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
1004 hdr = (void *)skb->data;
1005 info = IEEE80211_SKB_CB(skb);
1007 if (!skb_queue_is_last(&tx->skbs, skb)) {
1008 hdr->frame_control |= morefrags;
1010 * No multi-rate retries for fragmented frames, that
1011 * would completely throw off the NAV at other STAs.
1013 info->control.rates[1].idx = -1;
1014 info->control.rates[2].idx = -1;
1015 info->control.rates[3].idx = -1;
1016 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
1017 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
1019 hdr->frame_control &= ~morefrags;
1021 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
1028 static ieee80211_tx_result debug_noinline
1029 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1031 struct sk_buff *skb;
1037 skb_queue_walk(&tx->skbs, skb) {
1038 ac = skb_get_queue_mapping(skb);
1039 tx->sta->tx_stats.bytes[ac] += skb->len;
1042 tx->sta->tx_stats.packets[ac]++;
1047 static ieee80211_tx_result debug_noinline
1048 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1053 switch (tx->key->conf.cipher) {
1054 case WLAN_CIPHER_SUITE_WEP40:
1055 case WLAN_CIPHER_SUITE_WEP104:
1056 return ieee80211_crypto_wep_encrypt(tx);
1057 case WLAN_CIPHER_SUITE_TKIP:
1058 return ieee80211_crypto_tkip_encrypt(tx);
1059 case WLAN_CIPHER_SUITE_CCMP:
1060 return ieee80211_crypto_ccmp_encrypt(
1061 tx, IEEE80211_CCMP_MIC_LEN);
1062 case WLAN_CIPHER_SUITE_CCMP_256:
1063 return ieee80211_crypto_ccmp_encrypt(
1064 tx, IEEE80211_CCMP_256_MIC_LEN);
1065 case WLAN_CIPHER_SUITE_AES_CMAC:
1066 return ieee80211_crypto_aes_cmac_encrypt(tx);
1067 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1068 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1069 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1070 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1071 return ieee80211_crypto_aes_gmac_encrypt(tx);
1072 case WLAN_CIPHER_SUITE_GCMP:
1073 case WLAN_CIPHER_SUITE_GCMP_256:
1074 return ieee80211_crypto_gcmp_encrypt(tx);
1076 return ieee80211_crypto_hw_encrypt(tx);
1082 static ieee80211_tx_result debug_noinline
1083 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1085 struct sk_buff *skb;
1086 struct ieee80211_hdr *hdr;
1090 skb_queue_walk(&tx->skbs, skb) {
1091 hdr = (void *) skb->data;
1092 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1093 break; /* must not overwrite AID */
1094 if (!skb_queue_is_last(&tx->skbs, skb)) {
1095 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1096 next_len = next->len;
1099 group_addr = is_multicast_ether_addr(hdr->addr1);
1102 ieee80211_duration(tx, skb, group_addr, next_len);
1108 /* actual transmit path */
1110 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1111 struct sk_buff *skb,
1112 struct ieee80211_tx_info *info,
1113 struct tid_ampdu_tx *tid_tx,
1116 bool queued = false;
1117 bool reset_agg_timer = false;
1118 struct sk_buff *purge_skb = NULL;
1120 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1121 info->flags |= IEEE80211_TX_CTL_AMPDU;
1122 reset_agg_timer = true;
1123 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1125 * nothing -- this aggregation session is being started
1126 * but that might still fail with the driver
1128 } else if (!tx->sta->sta.txq[tid]) {
1129 spin_lock(&tx->sta->lock);
1131 * Need to re-check now, because we may get here
1133 * 1) in the window during which the setup is actually
1134 * already done, but not marked yet because not all
1135 * packets are spliced over to the driver pending
1136 * queue yet -- if this happened we acquire the lock
1137 * either before or after the splice happens, but
1138 * need to recheck which of these cases happened.
1140 * 2) during session teardown, if the OPERATIONAL bit
1141 * was cleared due to the teardown but the pointer
1142 * hasn't been assigned NULL yet (or we loaded it
1143 * before it was assigned) -- in this case it may
1144 * now be NULL which means we should just let the
1145 * packet pass through because splicing the frames
1146 * back is already done.
1148 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1151 /* do nothing, let packet pass through */
1152 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1153 info->flags |= IEEE80211_TX_CTL_AMPDU;
1154 reset_agg_timer = true;
1157 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1158 clear_sta_flag(tx->sta, WLAN_STA_SP);
1159 ps_dbg(tx->sta->sdata,
1160 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1161 tx->sta->sta.addr, tx->sta->sta.aid);
1163 info->control.vif = &tx->sdata->vif;
1164 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1165 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1166 __skb_queue_tail(&tid_tx->pending, skb);
1167 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1168 purge_skb = __skb_dequeue(&tid_tx->pending);
1170 spin_unlock(&tx->sta->lock);
1173 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1176 /* reset session timer */
1177 if (reset_agg_timer && tid_tx->timeout)
1178 tid_tx->last_tx = jiffies;
1185 * pass %NULL for the station if unknown, a valid pointer if known
1186 * or an ERR_PTR() if the station is known not to exist
1188 static ieee80211_tx_result
1189 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1190 struct ieee80211_tx_data *tx,
1191 struct sta_info *sta, struct sk_buff *skb)
1193 struct ieee80211_local *local = sdata->local;
1194 struct ieee80211_hdr *hdr;
1195 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1199 memset(tx, 0, sizeof(*tx));
1203 __skb_queue_head_init(&tx->skbs);
1206 * If this flag is set to true anywhere, and we get here,
1207 * we are doing the needed processing, so remove the flag
1210 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1212 hdr = (struct ieee80211_hdr *) skb->data;
1218 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1219 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1220 if (!tx->sta && sdata->wdev.use_4addr)
1222 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1223 IEEE80211_TX_CTL_INJECTED) ||
1224 tx->sdata->control_port_protocol == tx->skb->protocol) {
1225 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1227 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1228 tx->sta = sta_info_get(sdata, hdr->addr1);
1231 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1232 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1233 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1234 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1235 struct tid_ampdu_tx *tid_tx;
1237 qc = ieee80211_get_qos_ctl(hdr);
1238 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1240 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1244 queued = ieee80211_tx_prep_agg(tx, skb, info,
1247 if (unlikely(queued))
1252 if (is_multicast_ether_addr(hdr->addr1)) {
1253 tx->flags &= ~IEEE80211_TX_UNICAST;
1254 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1256 tx->flags |= IEEE80211_TX_UNICAST;
1258 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1259 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1260 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1261 info->flags & IEEE80211_TX_CTL_AMPDU)
1262 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1266 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1267 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1268 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1269 ieee80211_check_fast_xmit(tx->sta);
1272 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1277 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1279 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1282 static void ieee80211_set_skb_vif(struct sk_buff *skb, struct txq_info *txqi)
1284 IEEE80211_SKB_CB(skb)->control.vif = txqi->txq.vif;
1287 static u32 codel_skb_len_func(const struct sk_buff *skb)
1292 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1294 const struct ieee80211_tx_info *info;
1296 info = (const struct ieee80211_tx_info *)skb->cb;
1297 return info->control.enqueue_time;
1300 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1303 struct ieee80211_local *local;
1304 struct txq_info *txqi;
1306 struct fq_flow *flow;
1309 local = vif_to_sdata(txqi->txq.vif)->local;
1312 if (cvars == &txqi->def_cvars)
1313 flow = &txqi->def_flow;
1315 flow = &fq->flows[cvars - local->cvars];
1317 return fq_flow_dequeue(fq, flow);
1320 static void codel_drop_func(struct sk_buff *skb,
1323 struct ieee80211_local *local;
1324 struct ieee80211_hw *hw;
1325 struct txq_info *txqi;
1328 local = vif_to_sdata(txqi->txq.vif)->local;
1331 ieee80211_free_txskb(hw, skb);
1334 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1336 struct fq_flow *flow)
1338 struct ieee80211_local *local;
1339 struct txq_info *txqi;
1340 struct codel_vars *cvars;
1341 struct codel_params *cparams;
1342 struct codel_stats *cstats;
1344 local = container_of(fq, struct ieee80211_local, fq);
1345 txqi = container_of(tin, struct txq_info, tin);
1346 cparams = &local->cparams;
1347 cstats = &txqi->cstats;
1349 if (flow == &txqi->def_flow)
1350 cvars = &txqi->def_cvars;
1352 cvars = &local->cvars[flow - fq->flows];
1354 return codel_dequeue(txqi,
1360 codel_skb_time_func,
1362 codel_dequeue_func);
1365 static void fq_skb_free_func(struct fq *fq,
1367 struct fq_flow *flow,
1368 struct sk_buff *skb)
1370 struct ieee80211_local *local;
1372 local = container_of(fq, struct ieee80211_local, fq);
1373 ieee80211_free_txskb(&local->hw, skb);
1376 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1379 struct sk_buff *skb)
1381 struct txq_info *txqi;
1383 txqi = container_of(tin, struct txq_info, tin);
1384 return &txqi->def_flow;
1387 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1388 struct txq_info *txqi,
1389 struct sk_buff *skb)
1391 struct fq *fq = &local->fq;
1392 struct fq_tin *tin = &txqi->tin;
1394 ieee80211_set_skb_enqueue_time(skb);
1395 fq_tin_enqueue(fq, tin, skb,
1397 fq_flow_get_default_func);
1400 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1401 struct sta_info *sta,
1402 struct txq_info *txqi, int tid)
1404 fq_tin_init(&txqi->tin);
1405 fq_flow_init(&txqi->def_flow);
1406 codel_vars_init(&txqi->def_cvars);
1407 codel_stats_init(&txqi->cstats);
1409 txqi->txq.vif = &sdata->vif;
1412 txqi->txq.sta = &sta->sta;
1413 sta->sta.txq[tid] = &txqi->txq;
1414 txqi->txq.tid = tid;
1415 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
1417 sdata->vif.txq = &txqi->txq;
1419 txqi->txq.ac = IEEE80211_AC_BE;
1423 void ieee80211_txq_purge(struct ieee80211_local *local,
1424 struct txq_info *txqi)
1426 struct fq *fq = &local->fq;
1427 struct fq_tin *tin = &txqi->tin;
1429 fq_tin_reset(fq, tin, fq_skb_free_func);
1432 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1434 struct fq *fq = &local->fq;
1438 if (!local->ops->wake_tx_queue)
1441 ret = fq_init(fq, 4096);
1445 codel_params_init(&local->cparams);
1446 local->cparams.interval = MS2TIME(100);
1447 local->cparams.target = MS2TIME(20);
1448 local->cparams.ecn = true;
1450 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1452 if (!local->cvars) {
1453 spin_lock_bh(&fq->lock);
1454 fq_reset(fq, fq_skb_free_func);
1455 spin_unlock_bh(&fq->lock);
1459 for (i = 0; i < fq->flows_cnt; i++)
1460 codel_vars_init(&local->cvars[i]);
1465 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1467 struct fq *fq = &local->fq;
1469 if (!local->ops->wake_tx_queue)
1472 kfree(local->cvars);
1473 local->cvars = NULL;
1475 spin_lock_bh(&fq->lock);
1476 fq_reset(fq, fq_skb_free_func);
1477 spin_unlock_bh(&fq->lock);
1480 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
1481 struct ieee80211_txq *txq)
1483 struct ieee80211_local *local = hw_to_local(hw);
1484 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
1485 struct ieee80211_hdr *hdr;
1486 struct sk_buff *skb = NULL;
1487 struct fq *fq = &local->fq;
1488 struct fq_tin *tin = &txqi->tin;
1490 spin_lock_bh(&fq->lock);
1492 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags))
1495 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
1499 ieee80211_set_skb_vif(skb, txqi);
1501 hdr = (struct ieee80211_hdr *)skb->data;
1502 if (txq->sta && ieee80211_is_data_qos(hdr->frame_control)) {
1503 struct sta_info *sta = container_of(txq->sta, struct sta_info,
1505 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1507 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, txq->tid);
1508 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
1509 info->flags |= IEEE80211_TX_CTL_AMPDU;
1511 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1515 spin_unlock_bh(&fq->lock);
1517 if (skb && skb_has_frag_list(skb) &&
1518 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
1519 if (skb_linearize(skb)) {
1520 ieee80211_free_txskb(&local->hw, skb);
1527 EXPORT_SYMBOL(ieee80211_tx_dequeue);
1529 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1530 struct ieee80211_vif *vif,
1531 struct ieee80211_sta *sta,
1532 struct sk_buff_head *skbs,
1535 struct ieee80211_tx_control control = {};
1536 struct fq *fq = &local->fq;
1537 struct sk_buff *skb, *tmp;
1538 struct txq_info *txqi;
1539 unsigned long flags;
1541 skb_queue_walk_safe(skbs, skb, tmp) {
1542 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1543 int q = info->hw_queue;
1545 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1546 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1547 __skb_unlink(skb, skbs);
1548 ieee80211_free_txskb(&local->hw, skb);
1553 txqi = ieee80211_get_txq(local, vif, sta, skb);
1555 info->control.vif = vif;
1557 __skb_unlink(skb, skbs);
1559 spin_lock_bh(&fq->lock);
1560 ieee80211_txq_enqueue(local, txqi, skb);
1561 spin_unlock_bh(&fq->lock);
1563 drv_wake_tx_queue(local, txqi);
1568 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1569 if (local->queue_stop_reasons[q] ||
1570 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1571 if (unlikely(info->flags &
1572 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1573 if (local->queue_stop_reasons[q] &
1574 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1576 * Drop off-channel frames if queues
1577 * are stopped for any reason other
1578 * than off-channel operation. Never
1581 spin_unlock_irqrestore(
1582 &local->queue_stop_reason_lock,
1584 ieee80211_purge_tx_queue(&local->hw,
1591 * Since queue is stopped, queue up frames for
1592 * later transmission from the tx-pending
1593 * tasklet when the queue is woken again.
1596 skb_queue_splice_init(skbs,
1597 &local->pending[q]);
1599 skb_queue_splice_tail_init(skbs,
1600 &local->pending[q]);
1602 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1607 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1609 info->control.vif = vif;
1612 __skb_unlink(skb, skbs);
1613 drv_tx(local, &control, skb);
1620 * Returns false if the frame couldn't be transmitted but was queued instead.
1622 static bool __ieee80211_tx(struct ieee80211_local *local,
1623 struct sk_buff_head *skbs, int led_len,
1624 struct sta_info *sta, bool txpending)
1626 struct ieee80211_tx_info *info;
1627 struct ieee80211_sub_if_data *sdata;
1628 struct ieee80211_vif *vif;
1629 struct ieee80211_sta *pubsta;
1630 struct sk_buff *skb;
1634 if (WARN_ON(skb_queue_empty(skbs)))
1637 skb = skb_peek(skbs);
1638 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1639 info = IEEE80211_SKB_CB(skb);
1640 sdata = vif_to_sdata(info->control.vif);
1641 if (sta && !sta->uploaded)
1649 switch (sdata->vif.type) {
1650 case NL80211_IFTYPE_MONITOR:
1651 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1655 sdata = rcu_dereference(local->monitor_sdata);
1659 vif->hw_queue[skb_get_queue_mapping(skb)];
1660 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1661 ieee80211_purge_tx_queue(&local->hw, skbs);
1666 case NL80211_IFTYPE_AP_VLAN:
1667 sdata = container_of(sdata->bss,
1668 struct ieee80211_sub_if_data, u.ap);
1675 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1678 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1680 WARN_ON_ONCE(!skb_queue_empty(skbs));
1686 * Invoke TX handlers, return 0 on success and non-zero if the
1687 * frame was dropped or queued.
1689 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1691 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1692 ieee80211_tx_result res = TX_DROP;
1694 #define CALL_TXH(txh) \
1697 if (res != TX_CONTINUE) \
1701 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1702 CALL_TXH(ieee80211_tx_h_check_assoc);
1703 CALL_TXH(ieee80211_tx_h_ps_buf);
1704 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1705 CALL_TXH(ieee80211_tx_h_select_key);
1706 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1707 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1709 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1710 __skb_queue_tail(&tx->skbs, tx->skb);
1715 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1716 CALL_TXH(ieee80211_tx_h_sequence);
1717 CALL_TXH(ieee80211_tx_h_fragment);
1718 /* handlers after fragment must be aware of tx info fragmentation! */
1719 CALL_TXH(ieee80211_tx_h_stats);
1720 CALL_TXH(ieee80211_tx_h_encrypt);
1721 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1722 CALL_TXH(ieee80211_tx_h_calculate_duration);
1726 if (unlikely(res == TX_DROP)) {
1727 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1729 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1731 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1733 } else if (unlikely(res == TX_QUEUED)) {
1734 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1741 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1742 struct ieee80211_vif *vif, struct sk_buff *skb,
1743 int band, struct ieee80211_sta **sta)
1745 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1746 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1747 struct ieee80211_tx_data tx;
1748 struct sk_buff *skb2;
1750 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1754 info->control.vif = vif;
1755 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1757 if (invoke_tx_handlers(&tx))
1762 *sta = &tx.sta->sta;
1767 /* this function isn't suitable for fragmented data frames */
1768 skb2 = __skb_dequeue(&tx.skbs);
1769 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1770 ieee80211_free_txskb(hw, skb2);
1771 ieee80211_purge_tx_queue(hw, &tx.skbs);
1777 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1780 * Returns false if the frame couldn't be transmitted but was queued instead.
1782 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1783 struct sta_info *sta, struct sk_buff *skb,
1786 struct ieee80211_local *local = sdata->local;
1787 struct ieee80211_tx_data tx;
1788 ieee80211_tx_result res_prepare;
1789 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1793 if (unlikely(skb->len < 10)) {
1798 /* initialises tx */
1800 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1802 if (unlikely(res_prepare == TX_DROP)) {
1803 ieee80211_free_txskb(&local->hw, skb);
1805 } else if (unlikely(res_prepare == TX_QUEUED)) {
1809 /* set up hw_queue value early */
1810 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1811 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1813 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1815 if (!invoke_tx_handlers(&tx))
1816 result = __ieee80211_tx(local, &tx.skbs, led_len,
1822 /* device xmit handlers */
1824 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1825 struct sk_buff *skb,
1826 int head_need, bool may_encrypt)
1828 struct ieee80211_local *local = sdata->local;
1831 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1832 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1833 tail_need -= skb_tailroom(skb);
1834 tail_need = max_t(int, tail_need, 0);
1837 if (skb_cloned(skb) &&
1838 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1839 !skb_clone_writable(skb, ETH_HLEN) ||
1840 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt)))
1841 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1842 else if (head_need || tail_need)
1843 I802_DEBUG_INC(local->tx_expand_skb_head);
1847 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1848 wiphy_debug(local->hw.wiphy,
1849 "failed to reallocate TX buffer\n");
1856 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1857 struct sta_info *sta, struct sk_buff *skb)
1859 struct ieee80211_local *local = sdata->local;
1860 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1861 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1865 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1867 headroom = local->tx_headroom;
1869 headroom += sdata->encrypt_headroom;
1870 headroom -= skb_headroom(skb);
1871 headroom = max_t(int, 0, headroom);
1873 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1874 ieee80211_free_txskb(&local->hw, skb);
1878 hdr = (struct ieee80211_hdr *) skb->data;
1879 info->control.vif = &sdata->vif;
1881 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1882 if (ieee80211_is_data(hdr->frame_control) &&
1883 is_unicast_ether_addr(hdr->addr1)) {
1884 if (mesh_nexthop_resolve(sdata, skb))
1885 return; /* skb queued: don't free */
1887 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1891 ieee80211_set_qos_hdr(sdata, skb);
1892 ieee80211_tx(sdata, sta, skb, false);
1895 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
1896 struct sk_buff *skb)
1898 struct ieee80211_radiotap_iterator iterator;
1899 struct ieee80211_radiotap_header *rthdr =
1900 (struct ieee80211_radiotap_header *) skb->data;
1901 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1902 struct ieee80211_supported_band *sband =
1903 local->hw.wiphy->bands[info->band];
1904 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1908 bool rate_found = false;
1909 u8 rate_retries = 0;
1911 u8 mcs_known, mcs_flags, mcs_bw;
1913 u8 vht_mcs = 0, vht_nss = 0;
1916 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1917 IEEE80211_TX_CTL_DONTFRAG;
1920 * for every radiotap entry that is present
1921 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1922 * entries present, or -EINVAL on error)
1926 ret = ieee80211_radiotap_iterator_next(&iterator);
1931 /* see if this argument is something we can use */
1932 switch (iterator.this_arg_index) {
1934 * You must take care when dereferencing iterator.this_arg
1935 * for multibyte types... the pointer is not aligned. Use
1936 * get_unaligned((type *)iterator.this_arg) to dereference
1937 * iterator.this_arg for type "type" safely on all arches.
1939 case IEEE80211_RADIOTAP_FLAGS:
1940 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1942 * this indicates that the skb we have been
1943 * handed has the 32-bit FCS CRC at the end...
1944 * we should react to that by snipping it off
1945 * because it will be recomputed and added
1948 if (skb->len < (iterator._max_length + FCS_LEN))
1951 skb_trim(skb, skb->len - FCS_LEN);
1953 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1954 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1955 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1956 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1959 case IEEE80211_RADIOTAP_TX_FLAGS:
1960 txflags = get_unaligned_le16(iterator.this_arg);
1961 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1962 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1965 case IEEE80211_RADIOTAP_RATE:
1966 rate = *iterator.this_arg;
1971 case IEEE80211_RADIOTAP_DATA_RETRIES:
1972 rate_retries = *iterator.this_arg;
1975 case IEEE80211_RADIOTAP_MCS:
1976 mcs_known = iterator.this_arg[0];
1977 mcs_flags = iterator.this_arg[1];
1978 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
1982 rate = iterator.this_arg[2];
1983 rate_flags = IEEE80211_TX_RC_MCS;
1985 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
1986 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
1987 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
1989 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
1990 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
1991 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
1992 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
1995 case IEEE80211_RADIOTAP_VHT:
1996 vht_known = get_unaligned_le16(iterator.this_arg);
1999 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2000 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2001 (iterator.this_arg[2] &
2002 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2003 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2005 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2006 if (iterator.this_arg[3] == 1)
2008 IEEE80211_TX_RC_40_MHZ_WIDTH;
2009 else if (iterator.this_arg[3] == 4)
2011 IEEE80211_TX_RC_80_MHZ_WIDTH;
2012 else if (iterator.this_arg[3] == 11)
2014 IEEE80211_TX_RC_160_MHZ_WIDTH;
2017 vht_mcs = iterator.this_arg[4] >> 4;
2018 vht_nss = iterator.this_arg[4] & 0xF;
2022 * Please update the file
2023 * Documentation/networking/mac80211-injection.txt
2024 * when parsing new fields here.
2032 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2036 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2038 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2039 info->control.rates[i].idx = -1;
2040 info->control.rates[i].flags = 0;
2041 info->control.rates[i].count = 0;
2044 if (rate_flags & IEEE80211_TX_RC_MCS) {
2045 info->control.rates[0].idx = rate;
2046 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2047 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2050 for (i = 0; i < sband->n_bitrates; i++) {
2051 if (rate * 5 != sband->bitrates[i].bitrate)
2054 info->control.rates[0].idx = i;
2059 if (info->control.rates[0].idx < 0)
2060 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2062 info->control.rates[0].flags = rate_flags;
2063 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2064 local->hw.max_rate_tries);
2068 * remove the radiotap header
2069 * iterator->_max_length was sanity-checked against
2070 * skb->len by iterator init
2072 skb_pull(skb, iterator._max_length);
2077 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2078 struct net_device *dev)
2080 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2081 struct ieee80211_chanctx_conf *chanctx_conf;
2082 struct ieee80211_radiotap_header *prthdr =
2083 (struct ieee80211_radiotap_header *)skb->data;
2084 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2085 struct ieee80211_hdr *hdr;
2086 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2087 struct cfg80211_chan_def *chandef;
2091 /* check for not even having the fixed radiotap header part */
2092 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2093 goto fail; /* too short to be possibly valid */
2095 /* is it a header version we can trust to find length from? */
2096 if (unlikely(prthdr->it_version))
2097 goto fail; /* only version 0 is supported */
2099 /* then there must be a radiotap header with a length we can use */
2100 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2102 /* does the skb contain enough to deliver on the alleged length? */
2103 if (unlikely(skb->len < len_rthdr))
2104 goto fail; /* skb too short for claimed rt header extent */
2107 * fix up the pointers accounting for the radiotap
2108 * header still being in there. We are being given
2109 * a precooked IEEE80211 header so no need for
2112 skb_set_mac_header(skb, len_rthdr);
2114 * these are just fixed to the end of the rt area since we
2115 * don't have any better information and at this point, nobody cares
2117 skb_set_network_header(skb, len_rthdr);
2118 skb_set_transport_header(skb, len_rthdr);
2120 if (skb->len < len_rthdr + 2)
2123 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2124 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2126 if (skb->len < len_rthdr + hdrlen)
2130 * Initialize skb->protocol if the injected frame is a data frame
2131 * carrying a rfc1042 header
2133 if (ieee80211_is_data(hdr->frame_control) &&
2134 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2135 u8 *payload = (u8 *)hdr + hdrlen;
2137 if (ether_addr_equal(payload, rfc1042_header))
2138 skb->protocol = cpu_to_be16((payload[6] << 8) |
2142 memset(info, 0, sizeof(*info));
2144 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2145 IEEE80211_TX_CTL_INJECTED;
2150 * We process outgoing injected frames that have a local address
2151 * we handle as though they are non-injected frames.
2152 * This code here isn't entirely correct, the local MAC address
2153 * isn't always enough to find the interface to use; for proper
2154 * VLAN/WDS support we will need a different mechanism (which
2155 * likely isn't going to be monitor interfaces).
2157 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2159 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2160 if (!ieee80211_sdata_running(tmp_sdata))
2162 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2163 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2164 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2166 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2172 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2173 if (!chanctx_conf) {
2174 tmp_sdata = rcu_dereference(local->monitor_sdata);
2177 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2181 chandef = &chanctx_conf->def;
2182 else if (!local->use_chanctx)
2183 chandef = &local->_oper_chandef;
2188 * Frame injection is not allowed if beaconing is not allowed
2189 * or if we need radar detection. Beaconing is usually not allowed when
2190 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2191 * Passive scan is also used in world regulatory domains where
2192 * your country is not known and as such it should be treated as
2193 * NO TX unless the channel is explicitly allowed in which case
2194 * your current regulatory domain would not have the passive scan
2197 * Since AP mode uses monitor interfaces to inject/TX management
2198 * frames we can make AP mode the exception to this rule once it
2199 * supports radar detection as its implementation can deal with
2200 * radar detection by itself. We can do that later by adding a
2201 * monitor flag interfaces used for AP support.
2203 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2207 info->band = chandef->chan->band;
2209 /* process and remove the injection radiotap header */
2210 if (!ieee80211_parse_tx_radiotap(local, skb))
2213 ieee80211_xmit(sdata, NULL, skb);
2216 return NETDEV_TX_OK;
2222 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2225 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2227 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2229 return ethertype == ETH_P_TDLS &&
2231 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2234 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2235 struct sk_buff *skb,
2236 struct sta_info **sta_out)
2238 struct sta_info *sta;
2240 switch (sdata->vif.type) {
2241 case NL80211_IFTYPE_AP_VLAN:
2242 sta = rcu_dereference(sdata->u.vlan.sta);
2246 } else if (sdata->wdev.use_4addr) {
2250 case NL80211_IFTYPE_AP:
2251 case NL80211_IFTYPE_OCB:
2252 case NL80211_IFTYPE_ADHOC:
2253 if (is_multicast_ether_addr(skb->data)) {
2254 *sta_out = ERR_PTR(-ENOENT);
2257 sta = sta_info_get_bss(sdata, skb->data);
2259 case NL80211_IFTYPE_WDS:
2260 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2262 #ifdef CONFIG_MAC80211_MESH
2263 case NL80211_IFTYPE_MESH_POINT:
2264 /* determined much later */
2268 case NL80211_IFTYPE_STATION:
2269 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2270 sta = sta_info_get(sdata, skb->data);
2271 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2272 if (test_sta_flag(sta,
2273 WLAN_STA_TDLS_PEER_AUTH)) {
2279 * TDLS link during setup - throw out frames to
2280 * peer. Allow TDLS-setup frames to unauthorized
2281 * peers for the special case of a link teardown
2282 * after a TDLS sta is removed due to being
2285 if (!ieee80211_is_tdls_setup(skb))
2291 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2299 *sta_out = sta ?: ERR_PTR(-ENOENT);
2304 * ieee80211_build_hdr - build 802.11 header in the given frame
2305 * @sdata: virtual interface to build the header for
2306 * @skb: the skb to build the header in
2307 * @info_flags: skb flags to set
2309 * This function takes the skb with 802.3 header and reformats the header to
2310 * the appropriate IEEE 802.11 header based on which interface the packet is
2311 * being transmitted on.
2313 * Note that this function also takes care of the TX status request and
2314 * potential unsharing of the SKB - this needs to be interleaved with the
2317 * The function requires the read-side RCU lock held
2319 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2321 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2322 struct sk_buff *skb, u32 info_flags,
2323 struct sta_info *sta)
2325 struct ieee80211_local *local = sdata->local;
2326 struct ieee80211_tx_info *info;
2328 u16 ethertype, hdrlen, meshhdrlen = 0;
2330 struct ieee80211_hdr hdr;
2331 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2332 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2333 const u8 *encaps_data;
2334 int encaps_len, skip_header_bytes;
2335 bool wme_sta = false, authorized = false;
2339 struct ieee80211_chanctx_conf *chanctx_conf;
2340 struct ieee80211_sub_if_data *ap_sdata;
2341 enum nl80211_band band;
2347 /* convert Ethernet header to proper 802.11 header (based on
2348 * operation mode) */
2349 ethertype = (skb->data[12] << 8) | skb->data[13];
2350 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2352 switch (sdata->vif.type) {
2353 case NL80211_IFTYPE_AP_VLAN:
2354 if (sdata->wdev.use_4addr) {
2355 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2357 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2358 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2359 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2360 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2362 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2363 wme_sta = sta->sta.wme;
2365 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2367 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2368 if (!chanctx_conf) {
2372 band = chanctx_conf->def.chan->band;
2373 if (sdata->wdev.use_4addr)
2376 case NL80211_IFTYPE_AP:
2377 if (sdata->vif.type == NL80211_IFTYPE_AP)
2378 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2379 if (!chanctx_conf) {
2383 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2385 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2386 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2387 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2389 band = chanctx_conf->def.chan->band;
2391 case NL80211_IFTYPE_WDS:
2392 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2394 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2395 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2396 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2397 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2400 * This is the exception! WDS style interfaces are prohibited
2401 * when channel contexts are in used so this must be valid
2403 band = local->hw.conf.chandef.chan->band;
2405 #ifdef CONFIG_MAC80211_MESH
2406 case NL80211_IFTYPE_MESH_POINT:
2407 if (!is_multicast_ether_addr(skb->data)) {
2408 struct sta_info *next_hop;
2409 bool mpp_lookup = true;
2411 mpath = mesh_path_lookup(sdata, skb->data);
2414 next_hop = rcu_dereference(mpath->next_hop);
2416 !(mpath->flags & (MESH_PATH_ACTIVE |
2417 MESH_PATH_RESOLVING)))
2422 mppath = mpp_path_lookup(sdata, skb->data);
2424 mppath->exp_time = jiffies;
2427 if (mppath && mpath)
2428 mesh_path_del(sdata, mpath->dst);
2432 * Use address extension if it is a packet from
2433 * another interface or if we know the destination
2434 * is being proxied by a portal (i.e. portal address
2435 * differs from proxied address)
2437 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2438 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2439 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2440 skb->data, skb->data + ETH_ALEN);
2441 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2444 /* DS -> MBSS (802.11-2012 13.11.3.3).
2445 * For unicast with unknown forwarding information,
2446 * destination might be in the MBSS or if that fails
2447 * forwarded to another mesh gate. In either case
2448 * resolution will be handled in ieee80211_xmit(), so
2449 * leave the original DA. This also works for mcast */
2450 const u8 *mesh_da = skb->data;
2453 mesh_da = mppath->mpp;
2455 mesh_da = mpath->dst;
2457 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2458 mesh_da, sdata->vif.addr);
2459 if (is_multicast_ether_addr(mesh_da))
2460 /* DA TA mSA AE:SA */
2461 meshhdrlen = ieee80211_new_mesh_header(
2463 skb->data + ETH_ALEN, NULL);
2465 /* RA TA mDA mSA AE:DA SA */
2466 meshhdrlen = ieee80211_new_mesh_header(
2467 sdata, &mesh_hdr, skb->data,
2468 skb->data + ETH_ALEN);
2471 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2472 if (!chanctx_conf) {
2476 band = chanctx_conf->def.chan->band;
2479 case NL80211_IFTYPE_STATION:
2480 /* we already did checks when looking up the RA STA */
2481 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2485 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2486 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2487 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2489 } else if (sdata->u.mgd.use_4addr &&
2490 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2491 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2492 IEEE80211_FCTL_TODS);
2494 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2495 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2496 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2497 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2500 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2502 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2503 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2504 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2507 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2508 if (!chanctx_conf) {
2512 band = chanctx_conf->def.chan->band;
2514 case NL80211_IFTYPE_OCB:
2516 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2517 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2518 eth_broadcast_addr(hdr.addr3);
2520 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2521 if (!chanctx_conf) {
2525 band = chanctx_conf->def.chan->band;
2527 case NL80211_IFTYPE_ADHOC:
2529 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2530 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2531 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2533 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2534 if (!chanctx_conf) {
2538 band = chanctx_conf->def.chan->band;
2545 multicast = is_multicast_ether_addr(hdr.addr1);
2547 /* sta is always NULL for mesh */
2549 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2550 wme_sta = sta->sta.wme;
2551 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2552 /* For mesh, the use of the QoS header is mandatory */
2556 /* receiver does QoS (which also means we do) use it */
2558 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2563 * Drop unicast frames to unauthorised stations unless they are
2564 * EAPOL frames from the local station.
2566 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2567 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2568 !multicast && !authorized &&
2569 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2570 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2571 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2572 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2573 sdata->name, hdr.addr1);
2576 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2582 if (unlikely(!multicast && skb->sk &&
2583 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2584 struct sk_buff *ack_skb = skb_clone_sk(skb);
2587 unsigned long flags;
2590 spin_lock_irqsave(&local->ack_status_lock, flags);
2591 id = idr_alloc(&local->ack_status_frames, ack_skb,
2592 1, 0x10000, GFP_ATOMIC);
2593 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2597 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2605 * If the skb is shared we need to obtain our own copy.
2607 if (skb_shared(skb)) {
2608 struct sk_buff *tmp_skb = skb;
2610 /* can't happen -- skb is a clone if info_id != 0 */
2613 skb = skb_clone(skb, GFP_ATOMIC);
2622 hdr.frame_control = fc;
2623 hdr.duration_id = 0;
2626 skip_header_bytes = ETH_HLEN;
2627 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2628 encaps_data = bridge_tunnel_header;
2629 encaps_len = sizeof(bridge_tunnel_header);
2630 skip_header_bytes -= 2;
2631 } else if (ethertype >= ETH_P_802_3_MIN) {
2632 encaps_data = rfc1042_header;
2633 encaps_len = sizeof(rfc1042_header);
2634 skip_header_bytes -= 2;
2640 skb_pull(skb, skip_header_bytes);
2641 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2644 * So we need to modify the skb header and hence need a copy of
2645 * that. The head_need variable above doesn't, so far, include
2646 * the needed header space that we don't need right away. If we
2647 * can, then we don't reallocate right now but only after the
2648 * frame arrives at the master device (if it does...)
2650 * If we cannot, however, then we will reallocate to include all
2651 * the ever needed space. Also, if we need to reallocate it anyway,
2652 * make it big enough for everything we may ever need.
2655 if (head_need > 0 || skb_cloned(skb)) {
2656 head_need += sdata->encrypt_headroom;
2657 head_need += local->tx_headroom;
2658 head_need = max_t(int, 0, head_need);
2659 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2660 ieee80211_free_txskb(&local->hw, skb);
2662 return ERR_PTR(-ENOMEM);
2667 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2669 #ifdef CONFIG_MAC80211_MESH
2671 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2674 if (ieee80211_is_data_qos(fc)) {
2675 __le16 *qos_control;
2677 qos_control = (__le16 *) skb_push(skb, 2);
2678 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2680 * Maybe we could actually set some fields here, for now just
2681 * initialise to zero to indicate no special operation.
2685 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2687 skb_reset_mac_header(skb);
2689 info = IEEE80211_SKB_CB(skb);
2690 memset(info, 0, sizeof(*info));
2692 info->flags = info_flags;
2693 info->ack_frame_id = info_id;
2699 return ERR_PTR(ret);
2703 * fast-xmit overview
2705 * The core idea of this fast-xmit is to remove per-packet checks by checking
2706 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2707 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2708 * much less work can be done per packet. For example, fragmentation must be
2709 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2712 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2713 * header and other data to aid packet processing in ieee80211_xmit_fast().
2715 * The most difficult part of this is that when any of these assumptions
2716 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2717 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2718 * since the per-packet code no longer checks the conditions. This is reflected
2719 * by the calls to these functions throughout the rest of the code, and must be
2720 * maintained if any of the TX path checks change.
2723 void ieee80211_check_fast_xmit(struct sta_info *sta)
2725 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2726 struct ieee80211_local *local = sta->local;
2727 struct ieee80211_sub_if_data *sdata = sta->sdata;
2728 struct ieee80211_hdr *hdr = (void *)build.hdr;
2729 struct ieee80211_chanctx_conf *chanctx_conf;
2732 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2735 /* Locking here protects both the pointer itself, and against concurrent
2736 * invocations winning data access races to, e.g., the key pointer that
2738 * Without it, the invocation of this function right after the key
2739 * pointer changes wouldn't be sufficient, as another CPU could access
2740 * the pointer, then stall, and then do the cache update after the CPU
2741 * that invalidated the key.
2742 * With the locking, such scenarios cannot happen as the check for the
2743 * key and the fast-tx assignment are done atomically, so the CPU that
2744 * modifies the key will either wait or other one will see the key
2745 * cleared/changed already.
2747 spin_lock_bh(&sta->lock);
2748 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2749 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2750 sdata->vif.type == NL80211_IFTYPE_STATION)
2753 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2756 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2757 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2758 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2759 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2762 if (sdata->noack_map)
2765 /* fast-xmit doesn't handle fragmentation at all */
2766 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2767 !local->ops->set_frag_threshold)
2771 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2772 if (!chanctx_conf) {
2776 build.band = chanctx_conf->def.chan->band;
2779 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2781 switch (sdata->vif.type) {
2782 case NL80211_IFTYPE_ADHOC:
2784 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2785 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2786 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2789 case NL80211_IFTYPE_STATION:
2790 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2792 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2793 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2794 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2799 if (sdata->u.mgd.use_4addr) {
2800 /* non-regular ethertype cannot use the fastpath */
2801 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2802 IEEE80211_FCTL_TODS);
2804 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2805 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2806 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2807 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2811 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2813 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2814 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2815 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2818 case NL80211_IFTYPE_AP_VLAN:
2819 if (sdata->wdev.use_4addr) {
2820 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2821 IEEE80211_FCTL_TODS);
2823 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2824 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2825 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2826 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2831 case NL80211_IFTYPE_AP:
2832 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2834 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2835 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2836 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2840 /* not handled on fast-xmit */
2846 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2849 /* We store the key here so there's no point in using rcu_dereference()
2850 * but that's fine because the code that changes the pointers will call
2851 * this function after doing so. For a single CPU that would be enough,
2852 * for multiple see the comment above.
2854 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2856 build.key = rcu_access_pointer(sdata->default_unicast_key);
2858 bool gen_iv, iv_spc, mmic;
2860 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2861 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2862 mmic = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC;
2864 /* don't handle software crypto */
2865 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
2868 switch (build.key->conf.cipher) {
2869 case WLAN_CIPHER_SUITE_CCMP:
2870 case WLAN_CIPHER_SUITE_CCMP_256:
2871 /* add fixed key ID */
2873 (build.hdr + build.hdr_len)[3] =
2874 0x20 | (build.key->conf.keyidx << 6);
2875 build.pn_offs = build.hdr_len;
2877 if (gen_iv || iv_spc)
2878 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
2880 case WLAN_CIPHER_SUITE_GCMP:
2881 case WLAN_CIPHER_SUITE_GCMP_256:
2882 /* add fixed key ID */
2884 (build.hdr + build.hdr_len)[3] =
2885 0x20 | (build.key->conf.keyidx << 6);
2886 build.pn_offs = build.hdr_len;
2888 if (gen_iv || iv_spc)
2889 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
2891 case WLAN_CIPHER_SUITE_TKIP:
2892 /* cannot handle MMIC or IV generation in xmit-fast */
2896 build.hdr_len += IEEE80211_TKIP_IV_LEN;
2898 case WLAN_CIPHER_SUITE_WEP40:
2899 case WLAN_CIPHER_SUITE_WEP104:
2900 /* cannot handle IV generation in fast-xmit */
2904 build.hdr_len += IEEE80211_WEP_IV_LEN;
2906 case WLAN_CIPHER_SUITE_AES_CMAC:
2907 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
2908 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
2909 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
2911 "management cipher suite 0x%x enabled for data\n",
2912 build.key->conf.cipher);
2915 /* we don't know how to generate IVs for this at all */
2916 if (WARN_ON(gen_iv))
2918 /* pure hardware keys are OK, of course */
2919 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
2921 /* cipher scheme might require space allocation */
2923 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
2926 build.hdr_len += build.key->conf.iv_len;
2929 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
2932 hdr->frame_control = fc;
2934 memcpy(build.hdr + build.hdr_len,
2935 rfc1042_header, sizeof(rfc1042_header));
2936 build.hdr_len += sizeof(rfc1042_header);
2938 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
2939 /* if the kmemdup fails, continue w/o fast_tx */
2944 /* we might have raced against another call to this function */
2945 old = rcu_dereference_protected(sta->fast_tx,
2946 lockdep_is_held(&sta->lock));
2947 rcu_assign_pointer(sta->fast_tx, fast_tx);
2949 kfree_rcu(old, rcu_head);
2950 spin_unlock_bh(&sta->lock);
2953 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
2955 struct sta_info *sta;
2958 list_for_each_entry_rcu(sta, &local->sta_list, list)
2959 ieee80211_check_fast_xmit(sta);
2963 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
2965 struct ieee80211_local *local = sdata->local;
2966 struct sta_info *sta;
2970 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2971 if (sdata != sta->sdata &&
2972 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
2974 ieee80211_check_fast_xmit(sta);
2980 void ieee80211_clear_fast_xmit(struct sta_info *sta)
2982 struct ieee80211_fast_tx *fast_tx;
2984 spin_lock_bh(&sta->lock);
2985 fast_tx = rcu_dereference_protected(sta->fast_tx,
2986 lockdep_is_held(&sta->lock));
2987 RCU_INIT_POINTER(sta->fast_tx, NULL);
2988 spin_unlock_bh(&sta->lock);
2991 kfree_rcu(fast_tx, rcu_head);
2994 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
2995 struct sk_buff *skb, int headroom,
2998 int amsdu_len = *subframe_len + sizeof(struct ethhdr);
2999 int padding = (4 - amsdu_len) & 3;
3001 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) {
3002 I802_DEBUG_INC(local->tx_expand_skb_head);
3004 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) {
3005 wiphy_debug(local->hw.wiphy,
3006 "failed to reallocate TX buffer\n");
3012 *subframe_len += padding;
3013 memset(skb_put(skb, padding), 0, padding);
3019 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3020 struct ieee80211_fast_tx *fast_tx,
3021 struct sk_buff *skb)
3023 struct ieee80211_local *local = sdata->local;
3024 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3025 struct ieee80211_hdr *hdr;
3026 struct ethhdr amsdu_hdr;
3027 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3028 int subframe_len = skb->len - hdr_len;
3032 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3035 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3038 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(amsdu_hdr),
3042 amsdu_hdr.h_proto = cpu_to_be16(subframe_len);
3043 memcpy(amsdu_hdr.h_source, skb->data + fast_tx->sa_offs, ETH_ALEN);
3044 memcpy(amsdu_hdr.h_dest, skb->data + fast_tx->da_offs, ETH_ALEN);
3046 data = skb_push(skb, sizeof(amsdu_hdr));
3047 memmove(data, data + sizeof(amsdu_hdr), hdr_len);
3048 memcpy(data + hdr_len, &amsdu_hdr, sizeof(amsdu_hdr));
3051 qc = ieee80211_get_qos_ctl(hdr);
3052 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3054 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3059 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3060 struct sta_info *sta,
3061 struct ieee80211_fast_tx *fast_tx,
3062 struct sk_buff *skb)
3064 struct ieee80211_local *local = sdata->local;
3065 struct fq *fq = &local->fq;
3067 struct fq_flow *flow;
3068 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3069 struct ieee80211_txq *txq = sta->sta.txq[tid];
3070 struct txq_info *txqi;
3071 struct sk_buff **frag_tail, *head;
3072 int subframe_len = skb->len - ETH_ALEN;
3073 u8 max_subframes = sta->sta.max_amsdu_subframes;
3074 int max_frags = local->hw.max_tx_fragments;
3075 int max_amsdu_len = sta->sta.max_amsdu_len;
3079 unsigned int orig_len;
3082 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3088 txqi = to_txq_info(txq);
3089 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3092 if (sta->sta.max_rc_amsdu_len)
3093 max_amsdu_len = min_t(int, max_amsdu_len,
3094 sta->sta.max_rc_amsdu_len);
3096 spin_lock_bh(&fq->lock);
3098 /* TODO: Ideally aggregation should be done on dequeue to remain
3099 * responsive to environment changes.
3103 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func);
3104 head = skb_peek_tail(&flow->queue);
3108 orig_len = head->len;
3110 if (skb->len + head->len > max_amsdu_len)
3113 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3116 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3117 nfrags += 1 + skb_shinfo(head)->nr_frags;
3118 frag_tail = &skb_shinfo(head)->frag_list;
3119 while (*frag_tail) {
3120 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3121 frag_tail = &(*frag_tail)->next;
3125 if (max_subframes && n > max_subframes)
3128 if (max_frags && nfrags > max_frags)
3131 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2,
3136 data = skb_push(skb, ETH_ALEN + 2);
3137 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3139 data += 2 * ETH_ALEN;
3140 len = cpu_to_be16(subframe_len);
3141 memcpy(data, &len, 2);
3142 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3144 head->len += skb->len;
3145 head->data_len += skb->len;
3148 flow->backlog += head->len - orig_len;
3149 tin->backlog_bytes += head->len - orig_len;
3151 fq_recalc_backlog(fq, tin, flow);
3154 spin_unlock_bh(&fq->lock);
3159 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3160 struct net_device *dev, struct sta_info *sta,
3161 struct ieee80211_fast_tx *fast_tx,
3162 struct sk_buff *skb)
3164 struct ieee80211_local *local = sdata->local;
3165 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3166 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3167 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3169 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3170 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3171 struct ieee80211_tx_data tx;
3172 ieee80211_tx_result r;
3173 struct tid_ampdu_tx *tid_tx = NULL;
3174 u8 tid = IEEE80211_NUM_TIDS;
3176 /* control port protocol needs a lot of special handling */
3177 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3180 /* only RFC 1042 SNAP */
3181 if (ethertype < ETH_P_802_3_MIN)
3184 /* don't handle TX status request here either */
3185 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3188 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3189 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3190 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3192 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3194 if (tid_tx->timeout)
3195 tid_tx->last_tx = jiffies;
3199 /* after this point (skb is modified) we cannot return false */
3201 if (skb_shared(skb)) {
3202 struct sk_buff *tmp_skb = skb;
3204 skb = skb_clone(skb, GFP_ATOMIC);
3211 ieee80211_tx_stats(dev, skb->len + extra_head);
3213 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3214 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3217 /* will not be crypto-handled beyond what we do here, so use false
3218 * as the may-encrypt argument for the resize to not account for
3219 * more room than we already have in 'extra_head'
3221 if (unlikely(ieee80211_skb_resize(sdata, skb,
3222 max_t(int, extra_head + hw_headroom -
3223 skb_headroom(skb), 0),
3229 memcpy(ð, skb->data, ETH_HLEN - 2);
3230 hdr = (void *)skb_push(skb, extra_head);
3231 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3232 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3233 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3235 memset(info, 0, sizeof(*info));
3236 info->band = fast_tx->band;
3237 info->control.vif = &sdata->vif;
3238 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3239 IEEE80211_TX_CTL_DONTFRAG |
3240 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3242 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3243 *ieee80211_get_qos_ctl(hdr) = tid;
3244 if (!ieee80211_get_txq(local, &sdata->vif, &sta->sta, skb))
3245 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3247 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3248 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3249 sdata->sequence_number += 0x10;
3252 if (skb_shinfo(skb)->gso_size)
3253 sta->tx_stats.msdu[tid] +=
3254 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3256 sta->tx_stats.msdu[tid]++;
3258 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3260 __skb_queue_head_init(&tx.skbs);
3262 tx.flags = IEEE80211_TX_UNICAST;
3266 tx.key = fast_tx->key;
3269 info->control.hw_key = &fast_tx->key->conf;
3271 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3273 r = ieee80211_tx_h_rate_ctrl(&tx);
3277 if (r != TX_CONTINUE) {
3284 /* statistics normally done by ieee80211_tx_h_stats (but that
3285 * has to consider fragmentation, so is more complex)
3287 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3288 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3290 if (fast_tx->pn_offs) {
3292 u8 *crypto_hdr = skb->data + fast_tx->pn_offs;
3294 switch (fast_tx->key->conf.cipher) {
3295 case WLAN_CIPHER_SUITE_CCMP:
3296 case WLAN_CIPHER_SUITE_CCMP_256:
3297 case WLAN_CIPHER_SUITE_GCMP:
3298 case WLAN_CIPHER_SUITE_GCMP_256:
3299 pn = atomic64_inc_return(&fast_tx->key->conf.tx_pn);
3301 crypto_hdr[1] = pn >> 8;
3302 crypto_hdr[4] = pn >> 16;
3303 crypto_hdr[5] = pn >> 24;
3304 crypto_hdr[6] = pn >> 32;
3305 crypto_hdr[7] = pn >> 40;
3310 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3311 sdata = container_of(sdata->bss,
3312 struct ieee80211_sub_if_data, u.ap);
3314 __skb_queue_tail(&tx.skbs, skb);
3315 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3319 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3320 struct net_device *dev,
3323 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3324 struct sta_info *sta;
3325 struct sk_buff *next;
3327 if (unlikely(skb->len < ETH_HLEN)) {
3334 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3337 if (!IS_ERR_OR_NULL(sta)) {
3338 struct ieee80211_fast_tx *fast_tx;
3340 fast_tx = rcu_dereference(sta->fast_tx);
3343 ieee80211_xmit_fast(sdata, dev, sta, fast_tx, skb))
3347 if (skb_is_gso(skb)) {
3348 struct sk_buff *segs;
3350 segs = skb_gso_segment(skb, 0);
3358 /* we cannot process non-linear frames on this path */
3359 if (skb_linearize(skb)) {
3364 /* the frame could be fragmented, software-encrypted, and other
3365 * things so we cannot really handle checksum offload with it -
3366 * fix it up in software before we handle anything else.
3368 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3369 skb_set_transport_header(skb,
3370 skb_checksum_start_offset(skb));
3371 if (skb_checksum_help(skb))
3384 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3388 ieee80211_tx_stats(dev, skb->len);
3390 ieee80211_xmit(sdata, sta, skb);
3400 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
3401 * @skb: packet to be sent
3402 * @dev: incoming interface
3404 * On failure skb will be freed.
3406 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
3407 struct net_device *dev)
3409 __ieee80211_subif_start_xmit(skb, dev, 0);
3410 return NETDEV_TX_OK;
3414 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
3415 struct sk_buff *skb, u32 info_flags)
3417 struct ieee80211_hdr *hdr;
3418 struct ieee80211_tx_data tx = {
3419 .local = sdata->local,
3422 struct sta_info *sta;
3426 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
3428 skb = ERR_PTR(-EINVAL);
3432 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
3436 hdr = (void *)skb->data;
3437 tx.sta = sta_info_get(sdata, hdr->addr1);
3440 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
3443 return ERR_PTR(-EINVAL);
3452 * ieee80211_clear_tx_pending may not be called in a context where
3453 * it is possible that it packets could come in again.
3455 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
3457 struct sk_buff *skb;
3460 for (i = 0; i < local->hw.queues; i++) {
3461 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
3462 ieee80211_free_txskb(&local->hw, skb);
3467 * Returns false if the frame couldn't be transmitted but was queued instead,
3468 * which in this case means re-queued -- take as an indication to stop sending
3469 * more pending frames.
3471 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
3472 struct sk_buff *skb)
3474 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3475 struct ieee80211_sub_if_data *sdata;
3476 struct sta_info *sta;
3477 struct ieee80211_hdr *hdr;
3479 struct ieee80211_chanctx_conf *chanctx_conf;
3481 sdata = vif_to_sdata(info->control.vif);
3483 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
3484 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3485 if (unlikely(!chanctx_conf)) {
3489 info->band = chanctx_conf->def.chan->band;
3490 result = ieee80211_tx(sdata, NULL, skb, true);
3492 struct sk_buff_head skbs;
3494 __skb_queue_head_init(&skbs);
3495 __skb_queue_tail(&skbs, skb);
3497 hdr = (struct ieee80211_hdr *)skb->data;
3498 sta = sta_info_get(sdata, hdr->addr1);
3500 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
3507 * Transmit all pending packets. Called from tasklet.
3509 void ieee80211_tx_pending(unsigned long data)
3511 struct ieee80211_local *local = (struct ieee80211_local *)data;
3512 unsigned long flags;
3518 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
3519 for (i = 0; i < local->hw.queues; i++) {
3521 * If queue is stopped by something other than due to pending
3522 * frames, or we have no pending frames, proceed to next queue.
3524 if (local->queue_stop_reasons[i] ||
3525 skb_queue_empty(&local->pending[i]))
3528 while (!skb_queue_empty(&local->pending[i])) {
3529 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
3530 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3532 if (WARN_ON(!info->control.vif)) {
3533 ieee80211_free_txskb(&local->hw, skb);
3537 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
3540 txok = ieee80211_tx_pending_skb(local, skb);
3541 spin_lock_irqsave(&local->queue_stop_reason_lock,
3547 if (skb_queue_empty(&local->pending[i]))
3548 ieee80211_propagate_queue_wake(local, i);
3550 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
3555 /* functions for drivers to get certain frames */
3557 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3558 struct ps_data *ps, struct sk_buff *skb,
3563 int i, have_bits = 0, n1, n2;
3565 /* Generate bitmap for TIM only if there are any STAs in power save
3567 if (atomic_read(&ps->num_sta_ps) > 0)
3568 /* in the hope that this is faster than
3569 * checking byte-for-byte */
3570 have_bits = !bitmap_empty((unsigned long *)ps->tim,
3571 IEEE80211_MAX_AID+1);
3573 if (ps->dtim_count == 0)
3574 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
3579 tim = pos = (u8 *) skb_put(skb, 6);
3580 *pos++ = WLAN_EID_TIM;
3582 *pos++ = ps->dtim_count;
3583 *pos++ = sdata->vif.bss_conf.dtim_period;
3585 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
3588 ps->dtim_bc_mc = aid0 == 1;
3591 /* Find largest even number N1 so that bits numbered 1 through
3592 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
3593 * (N2 + 1) x 8 through 2007 are 0. */
3595 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
3602 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
3609 /* Bitmap control */
3611 /* Part Virt Bitmap */
3612 skb_put(skb, n2 - n1);
3613 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
3615 tim[1] = n2 - n1 + 4;
3617 *pos++ = aid0; /* Bitmap control */
3618 *pos++ = 0; /* Part Virt Bitmap */
3622 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
3623 struct ps_data *ps, struct sk_buff *skb,
3626 struct ieee80211_local *local = sdata->local;
3629 * Not very nice, but we want to allow the driver to call
3630 * ieee80211_beacon_get() as a response to the set_tim()
3631 * callback. That, however, is already invoked under the
3632 * sta_lock to guarantee consistent and race-free update
3633 * of the tim bitmap in mac80211 and the driver.
3635 if (local->tim_in_locked_section) {
3636 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3638 spin_lock_bh(&local->tim_lock);
3639 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
3640 spin_unlock_bh(&local->tim_lock);
3646 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
3647 struct beacon_data *beacon)
3649 struct probe_resp *resp;
3651 size_t beacon_data_len;
3653 u8 count = beacon->csa_current_counter;
3655 switch (sdata->vif.type) {
3656 case NL80211_IFTYPE_AP:
3657 beacon_data = beacon->tail;
3658 beacon_data_len = beacon->tail_len;
3660 case NL80211_IFTYPE_ADHOC:
3661 beacon_data = beacon->head;
3662 beacon_data_len = beacon->head_len;
3664 case NL80211_IFTYPE_MESH_POINT:
3665 beacon_data = beacon->head;
3666 beacon_data_len = beacon->head_len;
3673 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
3674 resp = rcu_dereference(sdata->u.ap.probe_resp);
3676 if (beacon->csa_counter_offsets[i]) {
3677 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
3683 beacon_data[beacon->csa_counter_offsets[i]] = count;
3686 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
3687 resp->data[resp->csa_counter_offsets[i]] = count;
3692 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
3694 beacon->csa_current_counter--;
3696 /* the counter should never reach 0 */
3697 WARN_ON_ONCE(!beacon->csa_current_counter);
3699 return beacon->csa_current_counter;
3702 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
3704 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3705 struct beacon_data *beacon = NULL;
3710 if (sdata->vif.type == NL80211_IFTYPE_AP)
3711 beacon = rcu_dereference(sdata->u.ap.beacon);
3712 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
3713 beacon = rcu_dereference(sdata->u.ibss.presp);
3714 else if (ieee80211_vif_is_mesh(&sdata->vif))
3715 beacon = rcu_dereference(sdata->u.mesh.beacon);
3720 count = __ieee80211_csa_update_counter(beacon);
3726 EXPORT_SYMBOL(ieee80211_csa_update_counter);
3728 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
3730 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
3731 struct beacon_data *beacon = NULL;
3733 size_t beacon_data_len;
3736 if (!ieee80211_sdata_running(sdata))
3740 if (vif->type == NL80211_IFTYPE_AP) {
3741 struct ieee80211_if_ap *ap = &sdata->u.ap;
3743 beacon = rcu_dereference(ap->beacon);
3744 if (WARN_ON(!beacon || !beacon->tail))
3746 beacon_data = beacon->tail;
3747 beacon_data_len = beacon->tail_len;
3748 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
3749 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3751 beacon = rcu_dereference(ifibss->presp);
3755 beacon_data = beacon->head;
3756 beacon_data_len = beacon->head_len;
3757 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
3758 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3760 beacon = rcu_dereference(ifmsh->beacon);
3764 beacon_data = beacon->head;
3765 beacon_data_len = beacon->head_len;
3771 if (!beacon->csa_counter_offsets[0])
3774 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
3777 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
3784 EXPORT_SYMBOL(ieee80211_csa_is_complete);
3786 static struct sk_buff *
3787 __ieee80211_beacon_get(struct ieee80211_hw *hw,
3788 struct ieee80211_vif *vif,
3789 struct ieee80211_mutable_offsets *offs,
3792 struct ieee80211_local *local = hw_to_local(hw);
3793 struct beacon_data *beacon = NULL;
3794 struct sk_buff *skb = NULL;
3795 struct ieee80211_tx_info *info;
3796 struct ieee80211_sub_if_data *sdata = NULL;
3797 enum nl80211_band band;
3798 struct ieee80211_tx_rate_control txrc;
3799 struct ieee80211_chanctx_conf *chanctx_conf;
3800 int csa_off_base = 0;
3804 sdata = vif_to_sdata(vif);
3805 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3807 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
3811 memset(offs, 0, sizeof(*offs));
3813 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3814 struct ieee80211_if_ap *ap = &sdata->u.ap;
3816 beacon = rcu_dereference(ap->beacon);
3818 if (beacon->csa_counter_offsets[0]) {
3820 __ieee80211_csa_update_counter(beacon);
3822 ieee80211_set_csa(sdata, beacon);
3826 * headroom, head length,
3827 * tail length and maximum TIM length
3829 skb = dev_alloc_skb(local->tx_headroom +
3831 beacon->tail_len + 256 +
3832 local->hw.extra_beacon_tailroom);
3836 skb_reserve(skb, local->tx_headroom);
3837 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3840 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
3844 offs->tim_offset = beacon->head_len;
3845 offs->tim_length = skb->len - beacon->head_len;
3847 /* for AP the csa offsets are from tail */
3848 csa_off_base = skb->len;
3852 memcpy(skb_put(skb, beacon->tail_len),
3853 beacon->tail, beacon->tail_len);
3856 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
3857 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3858 struct ieee80211_hdr *hdr;
3860 beacon = rcu_dereference(ifibss->presp);
3864 if (beacon->csa_counter_offsets[0]) {
3866 __ieee80211_csa_update_counter(beacon);
3868 ieee80211_set_csa(sdata, beacon);
3871 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
3872 local->hw.extra_beacon_tailroom);
3875 skb_reserve(skb, local->tx_headroom);
3876 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3879 hdr = (struct ieee80211_hdr *) skb->data;
3880 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3881 IEEE80211_STYPE_BEACON);
3882 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3883 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3885 beacon = rcu_dereference(ifmsh->beacon);
3889 if (beacon->csa_counter_offsets[0]) {
3891 /* TODO: For mesh csa_counter is in TU, so
3892 * decrementing it by one isn't correct, but
3893 * for now we leave it consistent with overall
3894 * mac80211's behavior.
3896 __ieee80211_csa_update_counter(beacon);
3898 ieee80211_set_csa(sdata, beacon);
3901 if (ifmsh->sync_ops)
3902 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
3904 skb = dev_alloc_skb(local->tx_headroom +
3908 local->hw.extra_beacon_tailroom);
3911 skb_reserve(skb, local->tx_headroom);
3912 memcpy(skb_put(skb, beacon->head_len), beacon->head,
3914 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
3917 offs->tim_offset = beacon->head_len;
3918 offs->tim_length = skb->len - beacon->head_len;
3921 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
3929 if (offs && beacon) {
3932 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
3933 u16 csa_off = beacon->csa_counter_offsets[i];
3938 offs->csa_counter_offs[i] = csa_off_base + csa_off;
3942 band = chanctx_conf->def.chan->band;
3944 info = IEEE80211_SKB_CB(skb);
3946 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
3947 info->flags |= IEEE80211_TX_CTL_NO_ACK;
3950 memset(&txrc, 0, sizeof(txrc));
3952 txrc.sband = local->hw.wiphy->bands[band];
3953 txrc.bss_conf = &sdata->vif.bss_conf;
3955 txrc.reported_rate.idx = -1;
3956 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
3957 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
3958 txrc.max_rate_idx = -1;
3960 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
3962 rate_control_get_rate(sdata, NULL, &txrc);
3964 info->control.vif = vif;
3966 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
3967 IEEE80211_TX_CTL_ASSIGN_SEQ |
3968 IEEE80211_TX_CTL_FIRST_FRAGMENT;
3976 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
3977 struct ieee80211_vif *vif,
3978 struct ieee80211_mutable_offsets *offs)
3980 return __ieee80211_beacon_get(hw, vif, offs, true);
3982 EXPORT_SYMBOL(ieee80211_beacon_get_template);
3984 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
3985 struct ieee80211_vif *vif,
3986 u16 *tim_offset, u16 *tim_length)
3988 struct ieee80211_mutable_offsets offs = {};
3989 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
3990 struct sk_buff *copy;
3991 struct ieee80211_supported_band *sband;
3998 *tim_offset = offs.tim_offset;
4001 *tim_length = offs.tim_length;
4003 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4004 !hw_to_local(hw)->monitors)
4007 /* send a copy to monitor interfaces */
4008 copy = skb_copy(bcn, GFP_ATOMIC);
4012 shift = ieee80211_vif_get_shift(vif);
4013 sband = hw->wiphy->bands[ieee80211_get_sdata_band(vif_to_sdata(vif))];
4014 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4018 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4020 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4021 struct ieee80211_vif *vif)
4023 struct ieee80211_if_ap *ap = NULL;
4024 struct sk_buff *skb = NULL;
4025 struct probe_resp *presp = NULL;
4026 struct ieee80211_hdr *hdr;
4027 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4029 if (sdata->vif.type != NL80211_IFTYPE_AP)
4035 presp = rcu_dereference(ap->probe_resp);
4039 skb = dev_alloc_skb(presp->len);
4043 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
4045 hdr = (struct ieee80211_hdr *) skb->data;
4046 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4052 EXPORT_SYMBOL(ieee80211_proberesp_get);
4054 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4055 struct ieee80211_vif *vif)
4057 struct ieee80211_sub_if_data *sdata;
4058 struct ieee80211_if_managed *ifmgd;
4059 struct ieee80211_pspoll *pspoll;
4060 struct ieee80211_local *local;
4061 struct sk_buff *skb;
4063 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4066 sdata = vif_to_sdata(vif);
4067 ifmgd = &sdata->u.mgd;
4068 local = sdata->local;
4070 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4074 skb_reserve(skb, local->hw.extra_tx_headroom);
4076 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
4077 memset(pspoll, 0, sizeof(*pspoll));
4078 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4079 IEEE80211_STYPE_PSPOLL);
4080 pspoll->aid = cpu_to_le16(ifmgd->aid);
4082 /* aid in PS-Poll has its two MSBs each set to 1 */
4083 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4085 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4086 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4090 EXPORT_SYMBOL(ieee80211_pspoll_get);
4092 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4093 struct ieee80211_vif *vif)
4095 struct ieee80211_hdr_3addr *nullfunc;
4096 struct ieee80211_sub_if_data *sdata;
4097 struct ieee80211_if_managed *ifmgd;
4098 struct ieee80211_local *local;
4099 struct sk_buff *skb;
4101 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4104 sdata = vif_to_sdata(vif);
4105 ifmgd = &sdata->u.mgd;
4106 local = sdata->local;
4108 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
4112 skb_reserve(skb, local->hw.extra_tx_headroom);
4114 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
4116 memset(nullfunc, 0, sizeof(*nullfunc));
4117 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4118 IEEE80211_STYPE_NULLFUNC |
4119 IEEE80211_FCTL_TODS);
4120 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4121 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4122 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4126 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4128 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4130 const u8 *ssid, size_t ssid_len,
4133 struct ieee80211_local *local = hw_to_local(hw);
4134 struct ieee80211_hdr_3addr *hdr;
4135 struct sk_buff *skb;
4139 ie_ssid_len = 2 + ssid_len;
4141 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4142 ie_ssid_len + tailroom);
4146 skb_reserve(skb, local->hw.extra_tx_headroom);
4148 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
4149 memset(hdr, 0, sizeof(*hdr));
4150 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4151 IEEE80211_STYPE_PROBE_REQ);
4152 eth_broadcast_addr(hdr->addr1);
4153 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4154 eth_broadcast_addr(hdr->addr3);
4156 pos = skb_put(skb, ie_ssid_len);
4157 *pos++ = WLAN_EID_SSID;
4160 memcpy(pos, ssid, ssid_len);
4165 EXPORT_SYMBOL(ieee80211_probereq_get);
4167 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4168 const void *frame, size_t frame_len,
4169 const struct ieee80211_tx_info *frame_txctl,
4170 struct ieee80211_rts *rts)
4172 const struct ieee80211_hdr *hdr = frame;
4174 rts->frame_control =
4175 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4176 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4178 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4179 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4181 EXPORT_SYMBOL(ieee80211_rts_get);
4183 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4184 const void *frame, size_t frame_len,
4185 const struct ieee80211_tx_info *frame_txctl,
4186 struct ieee80211_cts *cts)
4188 const struct ieee80211_hdr *hdr = frame;
4190 cts->frame_control =
4191 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4192 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4193 frame_len, frame_txctl);
4194 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4196 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4199 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4200 struct ieee80211_vif *vif)
4202 struct ieee80211_local *local = hw_to_local(hw);
4203 struct sk_buff *skb = NULL;
4204 struct ieee80211_tx_data tx;
4205 struct ieee80211_sub_if_data *sdata;
4207 struct ieee80211_tx_info *info;
4208 struct ieee80211_chanctx_conf *chanctx_conf;
4210 sdata = vif_to_sdata(vif);
4213 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4218 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4219 struct beacon_data *beacon =
4220 rcu_dereference(sdata->u.ap.beacon);
4222 if (!beacon || !beacon->head)
4225 ps = &sdata->u.ap.ps;
4226 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4227 ps = &sdata->u.mesh.ps;
4232 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4233 goto out; /* send buffered bc/mc only after DTIM beacon */
4236 skb = skb_dequeue(&ps->bc_buf);
4239 local->total_ps_buffered--;
4241 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4242 struct ieee80211_hdr *hdr =
4243 (struct ieee80211_hdr *) skb->data;
4244 /* more buffered multicast/broadcast frames ==> set
4245 * MoreData flag in IEEE 802.11 header to inform PS
4247 hdr->frame_control |=
4248 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4251 if (sdata->vif.type == NL80211_IFTYPE_AP)
4252 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4253 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4255 ieee80211_free_txskb(hw, skb);
4258 info = IEEE80211_SKB_CB(skb);
4260 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4261 info->band = chanctx_conf->def.chan->band;
4263 if (invoke_tx_handlers(&tx))
4270 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4272 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4274 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4275 struct ieee80211_sub_if_data *sdata = sta->sdata;
4276 struct ieee80211_local *local = sdata->local;
4280 lockdep_assert_held(&local->sta_mtx);
4282 /* only some cases are supported right now */
4283 switch (sdata->vif.type) {
4284 case NL80211_IFTYPE_STATION:
4285 case NL80211_IFTYPE_AP:
4286 case NL80211_IFTYPE_AP_VLAN:
4293 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4296 if (sta->reserved_tid == tid) {
4301 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4302 sdata_err(sdata, "TID reservation already active\n");
4307 ieee80211_stop_vif_queues(sdata->local, sdata,
4308 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4312 /* Tear down BA sessions so we stop aggregating on this TID */
4313 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4314 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4315 __ieee80211_stop_tx_ba_session(sta, tid,
4316 AGG_STOP_LOCAL_REQUEST);
4319 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4320 __ieee80211_flush_queues(local, sdata, queues, false);
4322 sta->reserved_tid = tid;
4324 ieee80211_wake_vif_queues(local, sdata,
4325 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4327 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4328 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4334 EXPORT_SYMBOL(ieee80211_reserve_tid);
4336 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4338 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4339 struct ieee80211_sub_if_data *sdata = sta->sdata;
4341 lockdep_assert_held(&sdata->local->sta_mtx);
4343 /* only some cases are supported right now */
4344 switch (sdata->vif.type) {
4345 case NL80211_IFTYPE_STATION:
4346 case NL80211_IFTYPE_AP:
4347 case NL80211_IFTYPE_AP_VLAN:
4354 if (tid != sta->reserved_tid) {
4355 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
4359 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
4361 EXPORT_SYMBOL(ieee80211_unreserve_tid);
4363 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
4364 struct sk_buff *skb, int tid,
4365 enum nl80211_band band)
4367 int ac = ieee802_1d_to_ac[tid & 7];
4369 skb_reset_mac_header(skb);
4370 skb_set_queue_mapping(skb, ac);
4371 skb->priority = tid;
4373 skb->dev = sdata->dev;
4376 * The other path calling ieee80211_xmit is from the tasklet,
4377 * and while we can handle concurrent transmissions locking
4378 * requirements are that we do not come into tx with bhs on.
4381 IEEE80211_SKB_CB(skb)->band = band;
4382 ieee80211_xmit(sdata, NULL, skb);