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 <linux/time.h>
24 #include <net/net_namespace.h>
25 #include <net/ieee80211_radiotap.h>
26 #include <net/cfg80211.h>
27 #include <net/mac80211.h>
28 #include <asm/unaligned.h>
30 #include "ieee80211_i.h"
31 #include "driver-ops.h"
41 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
42 struct sk_buff *skb, int group_addr,
45 int rate, mrate, erp, dur, i, shift = 0;
46 struct ieee80211_rate *txrate;
47 struct ieee80211_local *local = tx->local;
48 struct ieee80211_supported_band *sband;
49 struct ieee80211_hdr *hdr;
50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
51 struct ieee80211_chanctx_conf *chanctx_conf;
55 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
57 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
58 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
62 /* assume HW handles this */
63 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
67 if (WARN_ON_ONCE(tx->rate.idx < 0))
70 sband = local->hw.wiphy->bands[info->band];
71 txrate = &sband->bitrates[tx->rate.idx];
73 erp = txrate->flags & IEEE80211_RATE_ERP_G;
76 * data and mgmt (except PS Poll):
78 * - during contention period:
79 * if addr1 is group address: 0
80 * if more fragments = 0 and addr1 is individual address: time to
81 * transmit one ACK plus SIFS
82 * if more fragments = 1 and addr1 is individual address: time to
83 * transmit next fragment plus 2 x ACK plus 3 x SIFS
86 * - control response frame (CTS or ACK) shall be transmitted using the
87 * same rate as the immediately previous frame in the frame exchange
88 * sequence, if this rate belongs to the PHY mandatory rates, or else
89 * at the highest possible rate belonging to the PHY rates in the
92 hdr = (struct ieee80211_hdr *)skb->data;
93 if (ieee80211_is_ctl(hdr->frame_control)) {
94 /* TODO: These control frames are not currently sent by
95 * mac80211, but should they be implemented, this function
96 * needs to be updated to support duration field calculation.
98 * RTS: time needed to transmit pending data/mgmt frame plus
99 * one CTS frame plus one ACK frame plus 3 x SIFS
100 * CTS: duration of immediately previous RTS minus time
101 * required to transmit CTS and its SIFS
102 * ACK: 0 if immediately previous directed data/mgmt had
103 * more=0, with more=1 duration in ACK frame is duration
104 * from previous frame minus time needed to transmit ACK
106 * PS Poll: BIT(15) | BIT(14) | aid
112 if (0 /* FIX: data/mgmt during CFP */)
113 return cpu_to_le16(32768);
115 if (group_addr) /* Group address as the destination - no ACK */
118 /* Individual destination address:
119 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
120 * CTS and ACK frames shall be transmitted using the highest rate in
121 * basic rate set that is less than or equal to the rate of the
122 * immediately previous frame and that is using the same modulation
123 * (CCK or OFDM). If no basic rate set matches with these requirements,
124 * the highest mandatory rate of the PHY that is less than or equal to
125 * the rate of the previous frame is used.
126 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
129 /* use lowest available if everything fails */
130 mrate = sband->bitrates[0].bitrate;
131 for (i = 0; i < sband->n_bitrates; i++) {
132 struct ieee80211_rate *r = &sband->bitrates[i];
134 if (r->bitrate > txrate->bitrate)
137 if ((rate_flags & r->flags) != rate_flags)
140 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
141 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
143 switch (sband->band) {
144 case IEEE80211_BAND_2GHZ: {
146 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
147 flag = IEEE80211_RATE_MANDATORY_G;
149 flag = IEEE80211_RATE_MANDATORY_B;
154 case IEEE80211_BAND_5GHZ:
155 if (r->flags & IEEE80211_RATE_MANDATORY_A)
158 case IEEE80211_BAND_60GHZ:
159 /* TODO, for now fall through */
160 case IEEE80211_NUM_BANDS:
166 /* No matching basic rate found; use highest suitable mandatory
168 rate = DIV_ROUND_UP(mrate, 1 << shift);
171 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
172 if (ieee80211_is_data_qos(hdr->frame_control) &&
173 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
176 /* Time needed to transmit ACK
177 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
178 * to closest integer */
179 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
180 tx->sdata->vif.bss_conf.use_short_preamble,
184 /* Frame is fragmented: duration increases with time needed to
185 * transmit next fragment plus ACK and 2 x SIFS. */
186 dur *= 2; /* ACK + SIFS */
188 dur += ieee80211_frame_duration(sband->band, next_frag_len,
189 txrate->bitrate, erp,
190 tx->sdata->vif.bss_conf.use_short_preamble,
194 return cpu_to_le16(dur);
198 static ieee80211_tx_result debug_noinline
199 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
201 struct ieee80211_local *local = tx->local;
202 struct ieee80211_if_managed *ifmgd;
204 /* driver doesn't support power save */
205 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
208 /* hardware does dynamic power save */
209 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
212 /* dynamic power save disabled */
213 if (local->hw.conf.dynamic_ps_timeout <= 0)
216 /* we are scanning, don't enable power save */
220 if (!local->ps_sdata)
223 /* No point if we're going to suspend */
224 if (local->quiescing)
227 /* dynamic ps is supported only in managed mode */
228 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
231 ifmgd = &tx->sdata->u.mgd;
234 * Don't wakeup from power save if u-apsd is enabled, voip ac has
235 * u-apsd enabled and the frame is in voip class. This effectively
236 * means that even if all access categories have u-apsd enabled, in
237 * practise u-apsd is only used with the voip ac. This is a
238 * workaround for the case when received voip class packets do not
239 * have correct qos tag for some reason, due the network or the
242 * Note: ifmgd->uapsd_queues access is racy here. If the value is
243 * changed via debugfs, user needs to reassociate manually to have
244 * everything in sync.
246 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
247 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
248 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
251 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
252 ieee80211_stop_queues_by_reason(&local->hw,
253 IEEE80211_MAX_QUEUE_MAP,
254 IEEE80211_QUEUE_STOP_REASON_PS,
256 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
257 ieee80211_queue_work(&local->hw,
258 &local->dynamic_ps_disable_work);
261 /* Don't restart the timer if we're not disassociated */
262 if (!ifmgd->associated)
265 mod_timer(&local->dynamic_ps_timer, jiffies +
266 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
271 static ieee80211_tx_result debug_noinline
272 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
275 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
276 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
279 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
282 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
283 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
284 !ieee80211_is_probe_req(hdr->frame_control) &&
285 !ieee80211_is_nullfunc(hdr->frame_control))
287 * When software scanning only nullfunc frames (to notify
288 * the sleep state to the AP) and probe requests (for the
289 * active scan) are allowed, all other frames should not be
290 * sent and we should not get here, but if we do
291 * nonetheless, drop them to avoid sending them
292 * off-channel. See the link below and
293 * ieee80211_start_scan() for more.
295 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
299 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
302 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
305 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
308 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
312 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
314 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
315 if (unlikely(!assoc &&
316 ieee80211_is_data(hdr->frame_control))) {
317 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
318 sdata_info(tx->sdata,
319 "dropped data frame to not associated station %pM\n",
322 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
325 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
326 ieee80211_is_data(hdr->frame_control) &&
327 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
329 * No associated STAs - no need to send multicast
338 /* This function is called whenever the AP is about to exceed the maximum limit
339 * of buffered frames for power saving STAs. This situation should not really
340 * happen often during normal operation, so dropping the oldest buffered packet
341 * from each queue should be OK to make some room for new frames. */
342 static void purge_old_ps_buffers(struct ieee80211_local *local)
344 int total = 0, purged = 0;
346 struct ieee80211_sub_if_data *sdata;
347 struct sta_info *sta;
349 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
352 if (sdata->vif.type == NL80211_IFTYPE_AP)
353 ps = &sdata->u.ap.ps;
354 else if (ieee80211_vif_is_mesh(&sdata->vif))
355 ps = &sdata->u.mesh.ps;
359 skb = skb_dequeue(&ps->bc_buf);
364 total += skb_queue_len(&ps->bc_buf);
368 * Drop one frame from each station from the lowest-priority
369 * AC that has frames at all.
371 list_for_each_entry_rcu(sta, &local->sta_list, list) {
374 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
375 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
376 total += skb_queue_len(&sta->ps_tx_buf[ac]);
379 ieee80211_free_txskb(&local->hw, skb);
385 local->total_ps_buffered = total;
386 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
389 static ieee80211_tx_result
390 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
392 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
393 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
397 * broadcast/multicast frame
399 * If any of the associated/peer stations is in power save mode,
400 * the frame is buffered to be sent after DTIM beacon frame.
401 * This is done either by the hardware or us.
404 /* powersaving STAs currently only in AP/VLAN/mesh mode */
405 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
406 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
410 ps = &tx->sdata->bss->ps;
411 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
412 ps = &tx->sdata->u.mesh.ps;
418 /* no buffering for ordered frames */
419 if (ieee80211_has_order(hdr->frame_control))
422 if (ieee80211_is_probe_req(hdr->frame_control))
425 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
426 info->hw_queue = tx->sdata->vif.cab_queue;
428 /* no stations in PS mode */
429 if (!atomic_read(&ps->num_sta_ps))
432 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
434 /* device releases frame after DTIM beacon */
435 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
438 /* buffered in mac80211 */
439 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
440 purge_old_ps_buffers(tx->local);
442 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
444 "BC TX buffer full - dropping the oldest frame\n");
445 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
447 tx->local->total_ps_buffered++;
449 skb_queue_tail(&ps->bc_buf, tx->skb);
454 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
457 if (!ieee80211_is_mgmt(fc))
460 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
463 if (!ieee80211_is_robust_mgmt_frame(skb))
469 static ieee80211_tx_result
470 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
472 struct sta_info *sta = tx->sta;
473 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
474 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
475 struct ieee80211_local *local = tx->local;
480 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
481 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
482 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
483 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
484 int ac = skb_get_queue_mapping(tx->skb);
486 if (ieee80211_is_mgmt(hdr->frame_control) &&
487 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
488 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
492 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
493 sta->sta.addr, sta->sta.aid, ac);
494 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
495 purge_old_ps_buffers(tx->local);
497 /* sync with ieee80211_sta_ps_deliver_wakeup */
498 spin_lock(&sta->ps_lock);
500 * STA woke up the meantime and all the frames on ps_tx_buf have
501 * been queued to pending queue. No reordering can happen, go
502 * ahead and Tx the packet.
504 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
505 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
506 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
507 spin_unlock(&sta->ps_lock);
511 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
512 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
514 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
516 ieee80211_free_txskb(&local->hw, old);
518 tx->local->total_ps_buffered++;
520 info->control.jiffies = jiffies;
521 info->control.vif = &tx->sdata->vif;
522 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
523 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
524 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
525 spin_unlock(&sta->ps_lock);
527 if (!timer_pending(&local->sta_cleanup))
528 mod_timer(&local->sta_cleanup,
529 round_jiffies(jiffies +
530 STA_INFO_CLEANUP_INTERVAL));
533 * We queued up some frames, so the TIM bit might
534 * need to be set, recalculate it.
536 sta_info_recalc_tim(sta);
539 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
541 "STA %pM in PS mode, but polling/in SP -> send frame\n",
548 static ieee80211_tx_result debug_noinline
549 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
551 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
554 if (tx->flags & IEEE80211_TX_UNICAST)
555 return ieee80211_tx_h_unicast_ps_buf(tx);
557 return ieee80211_tx_h_multicast_ps_buf(tx);
560 static ieee80211_tx_result debug_noinline
561 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
563 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
565 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
566 if (tx->sdata->control_port_no_encrypt)
567 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
568 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
569 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
575 static ieee80211_tx_result debug_noinline
576 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
578 struct ieee80211_key *key;
579 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
580 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
582 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
585 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
587 else if (ieee80211_is_mgmt(hdr->frame_control) &&
588 is_multicast_ether_addr(hdr->addr1) &&
589 ieee80211_is_robust_mgmt_frame(tx->skb) &&
590 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
592 else if (is_multicast_ether_addr(hdr->addr1) &&
593 (key = rcu_dereference(tx->sdata->default_multicast_key)))
595 else if (!is_multicast_ether_addr(hdr->addr1) &&
596 (key = rcu_dereference(tx->sdata->default_unicast_key)))
598 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
600 else if (!tx->sdata->drop_unencrypted)
602 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
604 else if (ieee80211_is_robust_mgmt_frame(tx->skb) &&
605 !(ieee80211_is_action(hdr->frame_control) &&
606 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
608 else if (ieee80211_is_mgmt(hdr->frame_control) &&
609 !ieee80211_is_robust_mgmt_frame(tx->skb))
612 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
617 bool skip_hw = false;
619 tx->key->tx_rx_count++;
620 /* TODO: add threshold stuff again */
622 switch (tx->key->conf.cipher) {
623 case WLAN_CIPHER_SUITE_WEP40:
624 case WLAN_CIPHER_SUITE_WEP104:
625 case WLAN_CIPHER_SUITE_TKIP:
626 if (!ieee80211_is_data_present(hdr->frame_control))
629 case WLAN_CIPHER_SUITE_CCMP:
630 case WLAN_CIPHER_SUITE_CCMP_256:
631 case WLAN_CIPHER_SUITE_GCMP:
632 case WLAN_CIPHER_SUITE_GCMP_256:
633 if (!ieee80211_is_data_present(hdr->frame_control) &&
634 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
638 skip_hw = (tx->key->conf.flags &
639 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
640 ieee80211_is_mgmt(hdr->frame_control);
642 case WLAN_CIPHER_SUITE_AES_CMAC:
643 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
644 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
645 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
646 if (!ieee80211_is_mgmt(hdr->frame_control))
651 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
652 !ieee80211_is_deauth(hdr->frame_control)))
655 if (!skip_hw && tx->key &&
656 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
657 info->control.hw_key = &tx->key->conf;
663 static ieee80211_tx_result debug_noinline
664 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
666 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
667 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
668 struct ieee80211_supported_band *sband;
670 struct ieee80211_tx_rate_control txrc;
671 struct ieee80211_sta_rates *ratetbl = NULL;
674 memset(&txrc, 0, sizeof(txrc));
676 sband = tx->local->hw.wiphy->bands[info->band];
678 len = min_t(u32, tx->skb->len + FCS_LEN,
679 tx->local->hw.wiphy->frag_threshold);
681 /* set up the tx rate control struct we give the RC algo */
682 txrc.hw = &tx->local->hw;
684 txrc.bss_conf = &tx->sdata->vif.bss_conf;
686 txrc.reported_rate.idx = -1;
687 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
688 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
689 txrc.max_rate_idx = -1;
691 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
693 if (tx->sdata->rc_has_mcs_mask[info->band])
694 txrc.rate_idx_mcs_mask =
695 tx->sdata->rc_rateidx_mcs_mask[info->band];
697 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
698 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
699 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
701 /* set up RTS protection if desired */
702 if (len > tx->local->hw.wiphy->rts_threshold) {
706 info->control.use_rts = txrc.rts;
707 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
710 * Use short preamble if the BSS can handle it, but not for
711 * management frames unless we know the receiver can handle
712 * that -- the management frame might be to a station that
713 * just wants a probe response.
715 if (tx->sdata->vif.bss_conf.use_short_preamble &&
716 (ieee80211_is_data(hdr->frame_control) ||
717 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
718 txrc.short_preamble = true;
720 info->control.short_preamble = txrc.short_preamble;
723 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
726 * Lets not bother rate control if we're associated and cannot
727 * talk to the sta. This should not happen.
729 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
730 !rate_usable_index_exists(sband, &tx->sta->sta),
731 "%s: Dropped data frame as no usable bitrate found while "
732 "scanning and associated. Target station: "
733 "%pM on %d GHz band\n",
734 tx->sdata->name, hdr->addr1,
739 * If we're associated with the sta at this point we know we can at
740 * least send the frame at the lowest bit rate.
742 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
744 if (tx->sta && !info->control.skip_table)
745 ratetbl = rcu_dereference(tx->sta->sta.rates);
747 if (unlikely(info->control.rates[0].idx < 0)) {
749 struct ieee80211_tx_rate rate = {
750 .idx = ratetbl->rate[0].idx,
751 .flags = ratetbl->rate[0].flags,
752 .count = ratetbl->rate[0].count
755 if (ratetbl->rate[0].idx < 0)
763 tx->rate = info->control.rates[0];
766 if (txrc.reported_rate.idx < 0) {
767 txrc.reported_rate = tx->rate;
768 if (tx->sta && ieee80211_is_data(hdr->frame_control))
769 tx->sta->last_tx_rate = txrc.reported_rate;
771 tx->sta->last_tx_rate = txrc.reported_rate;
776 if (unlikely(!info->control.rates[0].count))
777 info->control.rates[0].count = 1;
779 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
780 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
781 info->control.rates[0].count = 1;
786 static ieee80211_tx_result debug_noinline
787 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
789 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
790 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
796 * Packet injection may want to control the sequence
797 * number, if we have no matching interface then we
798 * neither assign one ourselves nor ask the driver to.
800 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
803 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
806 if (ieee80211_hdrlen(hdr->frame_control) < 24)
809 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
813 * Anything but QoS data that has a sequence number field
814 * (is long enough) gets a sequence number from the global
815 * counter. QoS data frames with a multicast destination
816 * also use the global counter (802.11-2012 9.3.2.10).
818 if (!ieee80211_is_data_qos(hdr->frame_control) ||
819 is_multicast_ether_addr(hdr->addr1)) {
820 /* driver should assign sequence number */
821 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
822 /* for pure STA mode without beacons, we can do it */
823 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
824 tx->sdata->sequence_number += 0x10;
826 tx->sta->tx_msdu[IEEE80211_NUM_TIDS]++;
831 * This should be true for injected/management frames only, for
832 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
833 * above since they are not QoS-data frames.
838 /* include per-STA, per-TID sequence counter */
840 qc = ieee80211_get_qos_ctl(hdr);
841 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
842 seq = &tx->sta->tid_seq[tid];
843 tx->sta->tx_msdu[tid]++;
845 hdr->seq_ctrl = cpu_to_le16(*seq);
847 /* Increase the sequence number. */
848 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
853 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
854 struct sk_buff *skb, int hdrlen,
857 struct ieee80211_local *local = tx->local;
858 struct ieee80211_tx_info *info;
860 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
861 int pos = hdrlen + per_fragm;
862 int rem = skb->len - hdrlen - per_fragm;
864 if (WARN_ON(rem < 0))
867 /* first fragment was already added to queue by caller */
870 int fraglen = per_fragm;
875 tmp = dev_alloc_skb(local->tx_headroom +
877 tx->sdata->encrypt_headroom +
878 IEEE80211_ENCRYPT_TAILROOM);
882 __skb_queue_tail(&tx->skbs, tmp);
885 local->tx_headroom + tx->sdata->encrypt_headroom);
887 /* copy control information */
888 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
890 info = IEEE80211_SKB_CB(tmp);
891 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
892 IEEE80211_TX_CTL_FIRST_FRAGMENT);
895 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
897 skb_copy_queue_mapping(tmp, skb);
898 tmp->priority = skb->priority;
901 /* copy header and data */
902 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
903 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
908 /* adjust first fragment's length */
909 skb_trim(skb, hdrlen + per_fragm);
913 static ieee80211_tx_result debug_noinline
914 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
916 struct sk_buff *skb = tx->skb;
917 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
918 struct ieee80211_hdr *hdr = (void *)skb->data;
919 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
923 /* no matter what happens, tx->skb moves to tx->skbs */
924 __skb_queue_tail(&tx->skbs, skb);
927 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
930 if (tx->local->ops->set_frag_threshold)
934 * Warn when submitting a fragmented A-MPDU frame and drop it.
935 * This scenario is handled in ieee80211_tx_prepare but extra
936 * caution taken here as fragmented ampdu may cause Tx stop.
938 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
941 hdrlen = ieee80211_hdrlen(hdr->frame_control);
943 /* internal error, why isn't DONTFRAG set? */
944 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
948 * Now fragment the frame. This will allocate all the fragments and
949 * chain them (using skb as the first fragment) to skb->next.
950 * During transmission, we will remove the successfully transmitted
951 * fragments from this list. When the low-level driver rejects one
952 * of the fragments then we will simply pretend to accept the skb
953 * but store it away as pending.
955 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
958 /* update duration/seq/flags of fragments */
961 skb_queue_walk(&tx->skbs, skb) {
962 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
964 hdr = (void *)skb->data;
965 info = IEEE80211_SKB_CB(skb);
967 if (!skb_queue_is_last(&tx->skbs, skb)) {
968 hdr->frame_control |= morefrags;
970 * No multi-rate retries for fragmented frames, that
971 * would completely throw off the NAV at other STAs.
973 info->control.rates[1].idx = -1;
974 info->control.rates[2].idx = -1;
975 info->control.rates[3].idx = -1;
976 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
977 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
979 hdr->frame_control &= ~morefrags;
981 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
988 static ieee80211_tx_result debug_noinline
989 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
997 skb_queue_walk(&tx->skbs, skb) {
998 ac = skb_get_queue_mapping(skb);
999 tx->sta->tx_fragments++;
1000 tx->sta->tx_bytes[ac] += skb->len;
1003 tx->sta->tx_packets[ac]++;
1008 static ieee80211_tx_result debug_noinline
1009 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1014 switch (tx->key->conf.cipher) {
1015 case WLAN_CIPHER_SUITE_WEP40:
1016 case WLAN_CIPHER_SUITE_WEP104:
1017 return ieee80211_crypto_wep_encrypt(tx);
1018 case WLAN_CIPHER_SUITE_TKIP:
1019 return ieee80211_crypto_tkip_encrypt(tx);
1020 case WLAN_CIPHER_SUITE_CCMP:
1021 return ieee80211_crypto_ccmp_encrypt(
1022 tx, IEEE80211_CCMP_MIC_LEN);
1023 case WLAN_CIPHER_SUITE_CCMP_256:
1024 return ieee80211_crypto_ccmp_encrypt(
1025 tx, IEEE80211_CCMP_256_MIC_LEN);
1026 case WLAN_CIPHER_SUITE_AES_CMAC:
1027 return ieee80211_crypto_aes_cmac_encrypt(tx);
1028 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1029 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1030 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1031 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1032 return ieee80211_crypto_aes_gmac_encrypt(tx);
1033 case WLAN_CIPHER_SUITE_GCMP:
1034 case WLAN_CIPHER_SUITE_GCMP_256:
1035 return ieee80211_crypto_gcmp_encrypt(tx);
1037 return ieee80211_crypto_hw_encrypt(tx);
1043 static ieee80211_tx_result debug_noinline
1044 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1046 struct sk_buff *skb;
1047 struct ieee80211_hdr *hdr;
1051 skb_queue_walk(&tx->skbs, skb) {
1052 hdr = (void *) skb->data;
1053 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1054 break; /* must not overwrite AID */
1055 if (!skb_queue_is_last(&tx->skbs, skb)) {
1056 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1057 next_len = next->len;
1060 group_addr = is_multicast_ether_addr(hdr->addr1);
1063 ieee80211_duration(tx, skb, group_addr, next_len);
1069 /* actual transmit path */
1071 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1072 struct sk_buff *skb,
1073 struct ieee80211_tx_info *info,
1074 struct tid_ampdu_tx *tid_tx,
1077 bool queued = false;
1078 bool reset_agg_timer = false;
1079 struct sk_buff *purge_skb = NULL;
1081 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1082 info->flags |= IEEE80211_TX_CTL_AMPDU;
1083 reset_agg_timer = true;
1084 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1086 * nothing -- this aggregation session is being started
1087 * but that might still fail with the driver
1090 spin_lock(&tx->sta->lock);
1092 * Need to re-check now, because we may get here
1094 * 1) in the window during which the setup is actually
1095 * already done, but not marked yet because not all
1096 * packets are spliced over to the driver pending
1097 * queue yet -- if this happened we acquire the lock
1098 * either before or after the splice happens, but
1099 * need to recheck which of these cases happened.
1101 * 2) during session teardown, if the OPERATIONAL bit
1102 * was cleared due to the teardown but the pointer
1103 * hasn't been assigned NULL yet (or we loaded it
1104 * before it was assigned) -- in this case it may
1105 * now be NULL which means we should just let the
1106 * packet pass through because splicing the frames
1107 * back is already done.
1109 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1112 /* do nothing, let packet pass through */
1113 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1114 info->flags |= IEEE80211_TX_CTL_AMPDU;
1115 reset_agg_timer = true;
1118 info->control.vif = &tx->sdata->vif;
1119 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1120 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1121 __skb_queue_tail(&tid_tx->pending, skb);
1122 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1123 purge_skb = __skb_dequeue(&tid_tx->pending);
1125 spin_unlock(&tx->sta->lock);
1128 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1131 /* reset session timer */
1132 if (reset_agg_timer && tid_tx->timeout)
1133 tid_tx->last_tx = jiffies;
1141 static ieee80211_tx_result
1142 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1143 struct ieee80211_tx_data *tx,
1144 struct sk_buff *skb)
1146 struct ieee80211_local *local = sdata->local;
1147 struct ieee80211_hdr *hdr;
1148 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1152 memset(tx, 0, sizeof(*tx));
1156 __skb_queue_head_init(&tx->skbs);
1159 * If this flag is set to true anywhere, and we get here,
1160 * we are doing the needed processing, so remove the flag
1163 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1165 hdr = (struct ieee80211_hdr *) skb->data;
1167 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1168 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1169 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1171 } else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
1172 IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1173 tx->sdata->control_port_protocol == tx->skb->protocol) {
1174 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1177 tx->sta = sta_info_get(sdata, hdr->addr1);
1179 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1180 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1181 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1182 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1183 struct tid_ampdu_tx *tid_tx;
1185 qc = ieee80211_get_qos_ctl(hdr);
1186 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1188 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1192 queued = ieee80211_tx_prep_agg(tx, skb, info,
1195 if (unlikely(queued))
1200 if (is_multicast_ether_addr(hdr->addr1)) {
1201 tx->flags &= ~IEEE80211_TX_UNICAST;
1202 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1204 tx->flags |= IEEE80211_TX_UNICAST;
1206 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1207 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1208 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1209 info->flags & IEEE80211_TX_CTL_AMPDU)
1210 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1214 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1215 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1216 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1218 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1223 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1224 struct ieee80211_vif *vif,
1225 struct ieee80211_sta *sta,
1226 struct sk_buff_head *skbs,
1229 struct ieee80211_tx_control control;
1230 struct sk_buff *skb, *tmp;
1231 unsigned long flags;
1233 skb_queue_walk_safe(skbs, skb, tmp) {
1234 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1235 int q = info->hw_queue;
1237 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1238 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1239 __skb_unlink(skb, skbs);
1240 ieee80211_free_txskb(&local->hw, skb);
1245 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1246 if (local->queue_stop_reasons[q] ||
1247 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1248 if (unlikely(info->flags &
1249 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1250 if (local->queue_stop_reasons[q] &
1251 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1253 * Drop off-channel frames if queues
1254 * are stopped for any reason other
1255 * than off-channel operation. Never
1258 spin_unlock_irqrestore(
1259 &local->queue_stop_reason_lock,
1261 ieee80211_purge_tx_queue(&local->hw,
1268 * Since queue is stopped, queue up frames for
1269 * later transmission from the tx-pending
1270 * tasklet when the queue is woken again.
1273 skb_queue_splice_init(skbs,
1274 &local->pending[q]);
1276 skb_queue_splice_tail_init(skbs,
1277 &local->pending[q]);
1279 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1284 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1286 info->control.vif = vif;
1289 __skb_unlink(skb, skbs);
1290 drv_tx(local, &control, skb);
1297 * Returns false if the frame couldn't be transmitted but was queued instead.
1299 static bool __ieee80211_tx(struct ieee80211_local *local,
1300 struct sk_buff_head *skbs, int led_len,
1301 struct sta_info *sta, bool txpending)
1303 struct ieee80211_tx_info *info;
1304 struct ieee80211_sub_if_data *sdata;
1305 struct ieee80211_vif *vif;
1306 struct ieee80211_sta *pubsta;
1307 struct sk_buff *skb;
1311 if (WARN_ON(skb_queue_empty(skbs)))
1314 skb = skb_peek(skbs);
1315 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1316 info = IEEE80211_SKB_CB(skb);
1317 sdata = vif_to_sdata(info->control.vif);
1318 if (sta && !sta->uploaded)
1326 switch (sdata->vif.type) {
1327 case NL80211_IFTYPE_MONITOR:
1328 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1332 sdata = rcu_dereference(local->monitor_sdata);
1336 vif->hw_queue[skb_get_queue_mapping(skb)];
1337 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1343 case NL80211_IFTYPE_AP_VLAN:
1344 sdata = container_of(sdata->bss,
1345 struct ieee80211_sub_if_data, u.ap);
1352 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1355 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1357 WARN_ON_ONCE(!skb_queue_empty(skbs));
1363 * Invoke TX handlers, return 0 on success and non-zero if the
1364 * frame was dropped or queued.
1366 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1368 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1369 ieee80211_tx_result res = TX_DROP;
1371 #define CALL_TXH(txh) \
1374 if (res != TX_CONTINUE) \
1378 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1379 CALL_TXH(ieee80211_tx_h_check_assoc);
1380 CALL_TXH(ieee80211_tx_h_ps_buf);
1381 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1382 CALL_TXH(ieee80211_tx_h_select_key);
1383 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1384 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1386 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1387 __skb_queue_tail(&tx->skbs, tx->skb);
1392 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1393 CALL_TXH(ieee80211_tx_h_sequence);
1394 CALL_TXH(ieee80211_tx_h_fragment);
1395 /* handlers after fragment must be aware of tx info fragmentation! */
1396 CALL_TXH(ieee80211_tx_h_stats);
1397 CALL_TXH(ieee80211_tx_h_encrypt);
1398 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1399 CALL_TXH(ieee80211_tx_h_calculate_duration);
1403 if (unlikely(res == TX_DROP)) {
1404 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1406 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1408 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1410 } else if (unlikely(res == TX_QUEUED)) {
1411 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1418 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1419 struct ieee80211_vif *vif, struct sk_buff *skb,
1420 int band, struct ieee80211_sta **sta)
1422 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1423 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1424 struct ieee80211_tx_data tx;
1426 if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP)
1430 info->control.vif = vif;
1431 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1433 if (invoke_tx_handlers(&tx))
1438 *sta = &tx.sta->sta;
1445 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1448 * Returns false if the frame couldn't be transmitted but was queued instead.
1450 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1451 struct sk_buff *skb, bool txpending)
1453 struct ieee80211_local *local = sdata->local;
1454 struct ieee80211_tx_data tx;
1455 ieee80211_tx_result res_prepare;
1456 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1460 if (unlikely(skb->len < 10)) {
1465 /* initialises tx */
1467 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1469 if (unlikely(res_prepare == TX_DROP)) {
1470 ieee80211_free_txskb(&local->hw, skb);
1472 } else if (unlikely(res_prepare == TX_QUEUED)) {
1476 /* set up hw_queue value early */
1477 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1478 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1480 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1482 if (!invoke_tx_handlers(&tx))
1483 result = __ieee80211_tx(local, &tx.skbs, led_len,
1489 /* device xmit handlers */
1491 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1492 struct sk_buff *skb,
1493 int head_need, bool may_encrypt)
1495 struct ieee80211_local *local = sdata->local;
1498 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1499 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1500 tail_need -= skb_tailroom(skb);
1501 tail_need = max_t(int, tail_need, 0);
1504 if (skb_cloned(skb) &&
1505 (!(local->hw.flags & IEEE80211_HW_SUPPORTS_CLONED_SKBS) ||
1506 !skb_clone_writable(skb, ETH_HLEN) ||
1507 sdata->crypto_tx_tailroom_needed_cnt))
1508 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1509 else if (head_need || tail_need)
1510 I802_DEBUG_INC(local->tx_expand_skb_head);
1514 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1515 wiphy_debug(local->hw.wiphy,
1516 "failed to reallocate TX buffer\n");
1523 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1525 struct ieee80211_local *local = sdata->local;
1526 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1527 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1531 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1533 headroom = local->tx_headroom;
1535 headroom += sdata->encrypt_headroom;
1536 headroom -= skb_headroom(skb);
1537 headroom = max_t(int, 0, headroom);
1539 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1540 ieee80211_free_txskb(&local->hw, skb);
1544 hdr = (struct ieee80211_hdr *) skb->data;
1545 info->control.vif = &sdata->vif;
1547 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1548 if (ieee80211_is_data(hdr->frame_control) &&
1549 is_unicast_ether_addr(hdr->addr1)) {
1550 if (mesh_nexthop_resolve(sdata, skb))
1551 return; /* skb queued: don't free */
1553 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1557 ieee80211_set_qos_hdr(sdata, skb);
1558 ieee80211_tx(sdata, skb, false);
1561 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1563 struct ieee80211_radiotap_iterator iterator;
1564 struct ieee80211_radiotap_header *rthdr =
1565 (struct ieee80211_radiotap_header *) skb->data;
1566 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1567 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1571 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1572 IEEE80211_TX_CTL_DONTFRAG;
1575 * for every radiotap entry that is present
1576 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1577 * entries present, or -EINVAL on error)
1581 ret = ieee80211_radiotap_iterator_next(&iterator);
1586 /* see if this argument is something we can use */
1587 switch (iterator.this_arg_index) {
1589 * You must take care when dereferencing iterator.this_arg
1590 * for multibyte types... the pointer is not aligned. Use
1591 * get_unaligned((type *)iterator.this_arg) to dereference
1592 * iterator.this_arg for type "type" safely on all arches.
1594 case IEEE80211_RADIOTAP_FLAGS:
1595 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1597 * this indicates that the skb we have been
1598 * handed has the 32-bit FCS CRC at the end...
1599 * we should react to that by snipping it off
1600 * because it will be recomputed and added
1603 if (skb->len < (iterator._max_length + FCS_LEN))
1606 skb_trim(skb, skb->len - FCS_LEN);
1608 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1609 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1610 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1611 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1614 case IEEE80211_RADIOTAP_TX_FLAGS:
1615 txflags = get_unaligned_le16(iterator.this_arg);
1616 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1617 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1621 * Please update the file
1622 * Documentation/networking/mac80211-injection.txt
1623 * when parsing new fields here.
1631 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1635 * remove the radiotap header
1636 * iterator->_max_length was sanity-checked against
1637 * skb->len by iterator init
1639 skb_pull(skb, iterator._max_length);
1644 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1645 struct net_device *dev)
1647 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1648 struct ieee80211_chanctx_conf *chanctx_conf;
1649 struct ieee80211_radiotap_header *prthdr =
1650 (struct ieee80211_radiotap_header *)skb->data;
1651 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1652 struct ieee80211_hdr *hdr;
1653 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1654 struct cfg80211_chan_def *chandef;
1658 /* check for not even having the fixed radiotap header part */
1659 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1660 goto fail; /* too short to be possibly valid */
1662 /* is it a header version we can trust to find length from? */
1663 if (unlikely(prthdr->it_version))
1664 goto fail; /* only version 0 is supported */
1666 /* then there must be a radiotap header with a length we can use */
1667 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1669 /* does the skb contain enough to deliver on the alleged length? */
1670 if (unlikely(skb->len < len_rthdr))
1671 goto fail; /* skb too short for claimed rt header extent */
1674 * fix up the pointers accounting for the radiotap
1675 * header still being in there. We are being given
1676 * a precooked IEEE80211 header so no need for
1679 skb_set_mac_header(skb, len_rthdr);
1681 * these are just fixed to the end of the rt area since we
1682 * don't have any better information and at this point, nobody cares
1684 skb_set_network_header(skb, len_rthdr);
1685 skb_set_transport_header(skb, len_rthdr);
1687 if (skb->len < len_rthdr + 2)
1690 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1691 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1693 if (skb->len < len_rthdr + hdrlen)
1697 * Initialize skb->protocol if the injected frame is a data frame
1698 * carrying a rfc1042 header
1700 if (ieee80211_is_data(hdr->frame_control) &&
1701 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1702 u8 *payload = (u8 *)hdr + hdrlen;
1704 if (ether_addr_equal(payload, rfc1042_header))
1705 skb->protocol = cpu_to_be16((payload[6] << 8) |
1709 memset(info, 0, sizeof(*info));
1711 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1712 IEEE80211_TX_CTL_INJECTED;
1714 /* process and remove the injection radiotap header */
1715 if (!ieee80211_parse_tx_radiotap(skb))
1721 * We process outgoing injected frames that have a local address
1722 * we handle as though they are non-injected frames.
1723 * This code here isn't entirely correct, the local MAC address
1724 * isn't always enough to find the interface to use; for proper
1725 * VLAN/WDS support we will need a different mechanism (which
1726 * likely isn't going to be monitor interfaces).
1728 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1730 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1731 if (!ieee80211_sdata_running(tmp_sdata))
1733 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1734 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1735 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1737 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1743 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1744 if (!chanctx_conf) {
1745 tmp_sdata = rcu_dereference(local->monitor_sdata);
1748 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1752 chandef = &chanctx_conf->def;
1753 else if (!local->use_chanctx)
1754 chandef = &local->_oper_chandef;
1759 * Frame injection is not allowed if beaconing is not allowed
1760 * or if we need radar detection. Beaconing is usually not allowed when
1761 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1762 * Passive scan is also used in world regulatory domains where
1763 * your country is not known and as such it should be treated as
1764 * NO TX unless the channel is explicitly allowed in which case
1765 * your current regulatory domain would not have the passive scan
1768 * Since AP mode uses monitor interfaces to inject/TX management
1769 * frames we can make AP mode the exception to this rule once it
1770 * supports radar detection as its implementation can deal with
1771 * radar detection by itself. We can do that later by adding a
1772 * monitor flag interfaces used for AP support.
1774 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
1778 info->band = chandef->chan->band;
1779 ieee80211_xmit(sdata, skb);
1782 return NETDEV_TX_OK;
1788 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1792 * Measure Tx frame arrival time for Tx latency statistics calculation
1793 * A single Tx frame latency should be measured from when it is entering the
1794 * Kernel until we receive Tx complete confirmation indication and the skb is
1797 static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local *local,
1798 struct sk_buff *skb)
1800 struct ieee80211_tx_latency_bin_ranges *tx_latency;
1802 tx_latency = rcu_dereference(local->tx_latency);
1805 skb->tstamp = ktime_get();
1809 * ieee80211_build_hdr - build 802.11 header in the given frame
1810 * @sdata: virtual interface to build the header for
1811 * @skb: the skb to build the header in
1812 * @info_flags: skb flags to set
1814 * This function takes the skb with 802.3 header and reformats the header to
1815 * the appropriate IEEE 802.11 header based on which interface the packet is
1816 * being transmitted on.
1818 * Note that this function also takes care of the TX status request and
1819 * potential unsharing of the SKB - this needs to be interleaved with the
1822 * The function requires the read-side RCU lock held
1824 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
1826 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
1827 struct sk_buff *skb, u32 info_flags)
1829 struct ieee80211_local *local = sdata->local;
1830 struct ieee80211_tx_info *info;
1832 u16 ethertype, hdrlen, meshhdrlen = 0;
1834 struct ieee80211_hdr hdr;
1835 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1836 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1837 const u8 *encaps_data;
1838 int encaps_len, skip_header_bytes;
1840 struct sta_info *sta = NULL;
1841 bool wme_sta = false, authorized = false, tdls_auth = false;
1842 bool tdls_peer = false, tdls_setup_frame = false;
1845 struct ieee80211_chanctx_conf *chanctx_conf;
1846 struct ieee80211_sub_if_data *ap_sdata;
1847 enum ieee80211_band band;
1850 /* convert Ethernet header to proper 802.11 header (based on
1851 * operation mode) */
1852 ethertype = (skb->data[12] << 8) | skb->data[13];
1853 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1855 switch (sdata->vif.type) {
1856 case NL80211_IFTYPE_AP_VLAN:
1857 sta = rcu_dereference(sdata->u.vlan.sta);
1859 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1861 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1862 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1863 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1864 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1866 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1867 wme_sta = sta->sta.wme;
1869 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1871 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1872 if (!chanctx_conf) {
1876 band = chanctx_conf->def.chan->band;
1880 case NL80211_IFTYPE_AP:
1881 if (sdata->vif.type == NL80211_IFTYPE_AP)
1882 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1883 if (!chanctx_conf) {
1887 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1889 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1890 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1891 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1893 band = chanctx_conf->def.chan->band;
1895 case NL80211_IFTYPE_WDS:
1896 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1898 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1899 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1900 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1901 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1904 * This is the exception! WDS style interfaces are prohibited
1905 * when channel contexts are in used so this must be valid
1907 band = local->hw.conf.chandef.chan->band;
1909 #ifdef CONFIG_MAC80211_MESH
1910 case NL80211_IFTYPE_MESH_POINT:
1911 if (!is_multicast_ether_addr(skb->data)) {
1912 struct sta_info *next_hop;
1913 bool mpp_lookup = true;
1915 mpath = mesh_path_lookup(sdata, skb->data);
1918 next_hop = rcu_dereference(mpath->next_hop);
1920 !(mpath->flags & (MESH_PATH_ACTIVE |
1921 MESH_PATH_RESOLVING)))
1926 mppath = mpp_path_lookup(sdata, skb->data);
1928 if (mppath && mpath)
1929 mesh_path_del(mpath->sdata, mpath->dst);
1933 * Use address extension if it is a packet from
1934 * another interface or if we know the destination
1935 * is being proxied by a portal (i.e. portal address
1936 * differs from proxied address)
1938 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1939 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1940 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1941 skb->data, skb->data + ETH_ALEN);
1942 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1945 /* DS -> MBSS (802.11-2012 13.11.3.3).
1946 * For unicast with unknown forwarding information,
1947 * destination might be in the MBSS or if that fails
1948 * forwarded to another mesh gate. In either case
1949 * resolution will be handled in ieee80211_xmit(), so
1950 * leave the original DA. This also works for mcast */
1951 const u8 *mesh_da = skb->data;
1954 mesh_da = mppath->mpp;
1956 mesh_da = mpath->dst;
1958 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1959 mesh_da, sdata->vif.addr);
1960 if (is_multicast_ether_addr(mesh_da))
1961 /* DA TA mSA AE:SA */
1962 meshhdrlen = ieee80211_new_mesh_header(
1964 skb->data + ETH_ALEN, NULL);
1966 /* RA TA mDA mSA AE:DA SA */
1967 meshhdrlen = ieee80211_new_mesh_header(
1968 sdata, &mesh_hdr, skb->data,
1969 skb->data + ETH_ALEN);
1972 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1973 if (!chanctx_conf) {
1977 band = chanctx_conf->def.chan->band;
1980 case NL80211_IFTYPE_STATION:
1981 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1982 sta = sta_info_get(sdata, skb->data);
1984 authorized = test_sta_flag(sta,
1985 WLAN_STA_AUTHORIZED);
1986 wme_sta = sta->sta.wme;
1987 tdls_peer = test_sta_flag(sta,
1988 WLAN_STA_TDLS_PEER);
1989 tdls_auth = test_sta_flag(sta,
1990 WLAN_STA_TDLS_PEER_AUTH);
1995 ethertype == ETH_P_TDLS &&
1997 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2001 * TDLS link during setup - throw out frames to peer. We allow
2002 * TDLS-setup frames to unauthorized peers for the special case
2003 * of a link teardown after a TDLS sta is removed due to being
2006 if (tdls_peer && !tdls_auth && !tdls_setup_frame) {
2011 /* send direct packets to authorized TDLS peers */
2012 if (tdls_peer && tdls_auth) {
2014 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2015 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2016 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2018 } else if (sdata->u.mgd.use_4addr &&
2019 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2020 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2021 IEEE80211_FCTL_TODS);
2023 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2024 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2025 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2026 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2029 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2031 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2032 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2033 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2036 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2037 if (!chanctx_conf) {
2041 band = chanctx_conf->def.chan->band;
2043 case NL80211_IFTYPE_OCB:
2045 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2046 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2047 eth_broadcast_addr(hdr.addr3);
2049 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2050 if (!chanctx_conf) {
2054 band = chanctx_conf->def.chan->band;
2056 case NL80211_IFTYPE_ADHOC:
2058 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2059 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2060 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2062 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2063 if (!chanctx_conf) {
2067 band = chanctx_conf->def.chan->band;
2075 * There's no need to try to look up the destination
2076 * if it is a multicast address (which can only happen
2079 multicast = is_multicast_ether_addr(hdr.addr1);
2081 sta = sta_info_get(sdata, hdr.addr1);
2083 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2084 wme_sta = sta->sta.wme;
2088 /* For mesh, the use of the QoS header is mandatory */
2089 if (ieee80211_vif_is_mesh(&sdata->vif))
2092 /* receiver and we are QoS enabled, use a QoS type frame */
2093 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
2094 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2099 * Drop unicast frames to unauthorised stations unless they are
2100 * EAPOL frames from the local station.
2102 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2103 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2104 !multicast && !authorized &&
2105 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2106 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2107 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2108 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2109 sdata->name, hdr.addr1);
2112 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2118 if (unlikely(!multicast && skb->sk &&
2119 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2120 struct sk_buff *ack_skb = skb_clone_sk(skb);
2123 unsigned long flags;
2126 spin_lock_irqsave(&local->ack_status_lock, flags);
2127 id = idr_alloc(&local->ack_status_frames, ack_skb,
2128 1, 0x10000, GFP_ATOMIC);
2129 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2133 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2141 * If the skb is shared we need to obtain our own copy.
2143 if (skb_shared(skb)) {
2144 struct sk_buff *tmp_skb = skb;
2146 /* can't happen -- skb is a clone if info_id != 0 */
2149 skb = skb_clone(skb, GFP_ATOMIC);
2158 hdr.frame_control = fc;
2159 hdr.duration_id = 0;
2162 skip_header_bytes = ETH_HLEN;
2163 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2164 encaps_data = bridge_tunnel_header;
2165 encaps_len = sizeof(bridge_tunnel_header);
2166 skip_header_bytes -= 2;
2167 } else if (ethertype >= ETH_P_802_3_MIN) {
2168 encaps_data = rfc1042_header;
2169 encaps_len = sizeof(rfc1042_header);
2170 skip_header_bytes -= 2;
2176 nh_pos = skb_network_header(skb) - skb->data;
2177 h_pos = skb_transport_header(skb) - skb->data;
2179 skb_pull(skb, skip_header_bytes);
2180 nh_pos -= skip_header_bytes;
2181 h_pos -= skip_header_bytes;
2183 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2186 * So we need to modify the skb header and hence need a copy of
2187 * that. The head_need variable above doesn't, so far, include
2188 * the needed header space that we don't need right away. If we
2189 * can, then we don't reallocate right now but only after the
2190 * frame arrives at the master device (if it does...)
2192 * If we cannot, however, then we will reallocate to include all
2193 * the ever needed space. Also, if we need to reallocate it anyway,
2194 * make it big enough for everything we may ever need.
2197 if (head_need > 0 || skb_cloned(skb)) {
2198 head_need += sdata->encrypt_headroom;
2199 head_need += local->tx_headroom;
2200 head_need = max_t(int, 0, head_need);
2201 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2202 ieee80211_free_txskb(&local->hw, skb);
2204 return ERR_PTR(-ENOMEM);
2209 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2210 nh_pos += encaps_len;
2211 h_pos += encaps_len;
2214 #ifdef CONFIG_MAC80211_MESH
2215 if (meshhdrlen > 0) {
2216 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2217 nh_pos += meshhdrlen;
2218 h_pos += meshhdrlen;
2222 if (ieee80211_is_data_qos(fc)) {
2223 __le16 *qos_control;
2225 qos_control = (__le16 *) skb_push(skb, 2);
2226 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2228 * Maybe we could actually set some fields here, for now just
2229 * initialise to zero to indicate no special operation.
2233 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2238 /* Update skb pointers to various headers since this modified frame
2239 * is going to go through Linux networking code that may potentially
2240 * need things like pointer to IP header. */
2241 skb_set_mac_header(skb, 0);
2242 skb_set_network_header(skb, nh_pos);
2243 skb_set_transport_header(skb, h_pos);
2245 info = IEEE80211_SKB_CB(skb);
2246 memset(info, 0, sizeof(*info));
2248 info->flags = info_flags;
2249 info->ack_frame_id = info_id;
2255 return ERR_PTR(ret);
2258 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
2259 struct net_device *dev,
2262 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2263 struct ieee80211_local *local = sdata->local;
2265 if (unlikely(skb->len < ETH_HLEN)) {
2272 /* Measure frame arrival for Tx latency statistics calculation */
2273 ieee80211_tx_latency_start_msrmnt(local, skb);
2275 skb = ieee80211_build_hdr(sdata, skb, info_flags);
2279 dev->stats.tx_packets++;
2280 dev->stats.tx_bytes += skb->len;
2281 dev->trans_start = jiffies;
2283 ieee80211_xmit(sdata, skb);
2289 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
2290 * @skb: packet to be sent
2291 * @dev: incoming interface
2293 * On failure skb will be freed.
2295 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
2296 struct net_device *dev)
2298 __ieee80211_subif_start_xmit(skb, dev, 0);
2299 return NETDEV_TX_OK;
2303 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
2304 struct sk_buff *skb, u32 info_flags)
2306 struct ieee80211_hdr *hdr;
2307 struct ieee80211_tx_data tx = {
2308 .local = sdata->local,
2314 skb = ieee80211_build_hdr(sdata, skb, info_flags);
2318 hdr = (void *)skb->data;
2319 tx.sta = sta_info_get(sdata, hdr->addr1);
2322 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
2325 return ERR_PTR(-EINVAL);
2334 * ieee80211_clear_tx_pending may not be called in a context where
2335 * it is possible that it packets could come in again.
2337 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2339 struct sk_buff *skb;
2342 for (i = 0; i < local->hw.queues; i++) {
2343 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2344 ieee80211_free_txskb(&local->hw, skb);
2349 * Returns false if the frame couldn't be transmitted but was queued instead,
2350 * which in this case means re-queued -- take as an indication to stop sending
2351 * more pending frames.
2353 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2354 struct sk_buff *skb)
2356 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2357 struct ieee80211_sub_if_data *sdata;
2358 struct sta_info *sta;
2359 struct ieee80211_hdr *hdr;
2361 struct ieee80211_chanctx_conf *chanctx_conf;
2363 sdata = vif_to_sdata(info->control.vif);
2365 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2366 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2367 if (unlikely(!chanctx_conf)) {
2371 info->band = chanctx_conf->def.chan->band;
2372 result = ieee80211_tx(sdata, skb, true);
2374 struct sk_buff_head skbs;
2376 __skb_queue_head_init(&skbs);
2377 __skb_queue_tail(&skbs, skb);
2379 hdr = (struct ieee80211_hdr *)skb->data;
2380 sta = sta_info_get(sdata, hdr->addr1);
2382 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2389 * Transmit all pending packets. Called from tasklet.
2391 void ieee80211_tx_pending(unsigned long data)
2393 struct ieee80211_local *local = (struct ieee80211_local *)data;
2394 unsigned long flags;
2400 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2401 for (i = 0; i < local->hw.queues; i++) {
2403 * If queue is stopped by something other than due to pending
2404 * frames, or we have no pending frames, proceed to next queue.
2406 if (local->queue_stop_reasons[i] ||
2407 skb_queue_empty(&local->pending[i]))
2410 while (!skb_queue_empty(&local->pending[i])) {
2411 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2412 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2414 if (WARN_ON(!info->control.vif)) {
2415 ieee80211_free_txskb(&local->hw, skb);
2419 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2422 txok = ieee80211_tx_pending_skb(local, skb);
2423 spin_lock_irqsave(&local->queue_stop_reason_lock,
2429 if (skb_queue_empty(&local->pending[i]))
2430 ieee80211_propagate_queue_wake(local, i);
2432 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2437 /* functions for drivers to get certain frames */
2439 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2440 struct ps_data *ps, struct sk_buff *skb,
2445 int i, have_bits = 0, n1, n2;
2447 /* Generate bitmap for TIM only if there are any STAs in power save
2449 if (atomic_read(&ps->num_sta_ps) > 0)
2450 /* in the hope that this is faster than
2451 * checking byte-for-byte */
2452 have_bits = !bitmap_empty((unsigned long *)ps->tim,
2453 IEEE80211_MAX_AID+1);
2455 if (ps->dtim_count == 0)
2456 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2461 tim = pos = (u8 *) skb_put(skb, 6);
2462 *pos++ = WLAN_EID_TIM;
2464 *pos++ = ps->dtim_count;
2465 *pos++ = sdata->vif.bss_conf.dtim_period;
2467 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2470 ps->dtim_bc_mc = aid0 == 1;
2473 /* Find largest even number N1 so that bits numbered 1 through
2474 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2475 * (N2 + 1) x 8 through 2007 are 0. */
2477 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2484 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2491 /* Bitmap control */
2493 /* Part Virt Bitmap */
2494 skb_put(skb, n2 - n1);
2495 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2497 tim[1] = n2 - n1 + 4;
2499 *pos++ = aid0; /* Bitmap control */
2500 *pos++ = 0; /* Part Virt Bitmap */
2504 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2505 struct ps_data *ps, struct sk_buff *skb,
2508 struct ieee80211_local *local = sdata->local;
2511 * Not very nice, but we want to allow the driver to call
2512 * ieee80211_beacon_get() as a response to the set_tim()
2513 * callback. That, however, is already invoked under the
2514 * sta_lock to guarantee consistent and race-free update
2515 * of the tim bitmap in mac80211 and the driver.
2517 if (local->tim_in_locked_section) {
2518 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2520 spin_lock_bh(&local->tim_lock);
2521 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
2522 spin_unlock_bh(&local->tim_lock);
2528 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
2529 struct beacon_data *beacon)
2531 struct probe_resp *resp;
2533 size_t beacon_data_len;
2535 u8 count = beacon->csa_current_counter;
2537 switch (sdata->vif.type) {
2538 case NL80211_IFTYPE_AP:
2539 beacon_data = beacon->tail;
2540 beacon_data_len = beacon->tail_len;
2542 case NL80211_IFTYPE_ADHOC:
2543 beacon_data = beacon->head;
2544 beacon_data_len = beacon->head_len;
2546 case NL80211_IFTYPE_MESH_POINT:
2547 beacon_data = beacon->head;
2548 beacon_data_len = beacon->head_len;
2555 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
2556 resp = rcu_dereference(sdata->u.ap.probe_resp);
2558 if (beacon->csa_counter_offsets[i]) {
2559 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
2565 beacon_data[beacon->csa_counter_offsets[i]] = count;
2568 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
2569 resp->data[resp->csa_counter_offsets[i]] = count;
2574 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
2576 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2577 struct beacon_data *beacon = NULL;
2582 if (sdata->vif.type == NL80211_IFTYPE_AP)
2583 beacon = rcu_dereference(sdata->u.ap.beacon);
2584 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
2585 beacon = rcu_dereference(sdata->u.ibss.presp);
2586 else if (ieee80211_vif_is_mesh(&sdata->vif))
2587 beacon = rcu_dereference(sdata->u.mesh.beacon);
2592 beacon->csa_current_counter--;
2594 /* the counter should never reach 0 */
2595 WARN_ON_ONCE(!beacon->csa_current_counter);
2596 count = beacon->csa_current_counter;
2602 EXPORT_SYMBOL(ieee80211_csa_update_counter);
2604 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
2606 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2607 struct beacon_data *beacon = NULL;
2609 size_t beacon_data_len;
2612 if (!ieee80211_sdata_running(sdata))
2616 if (vif->type == NL80211_IFTYPE_AP) {
2617 struct ieee80211_if_ap *ap = &sdata->u.ap;
2619 beacon = rcu_dereference(ap->beacon);
2620 if (WARN_ON(!beacon || !beacon->tail))
2622 beacon_data = beacon->tail;
2623 beacon_data_len = beacon->tail_len;
2624 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
2625 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2627 beacon = rcu_dereference(ifibss->presp);
2631 beacon_data = beacon->head;
2632 beacon_data_len = beacon->head_len;
2633 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
2634 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2636 beacon = rcu_dereference(ifmsh->beacon);
2640 beacon_data = beacon->head;
2641 beacon_data_len = beacon->head_len;
2647 if (!beacon->csa_counter_offsets[0])
2650 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
2653 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
2660 EXPORT_SYMBOL(ieee80211_csa_is_complete);
2662 static struct sk_buff *
2663 __ieee80211_beacon_get(struct ieee80211_hw *hw,
2664 struct ieee80211_vif *vif,
2665 struct ieee80211_mutable_offsets *offs,
2668 struct ieee80211_local *local = hw_to_local(hw);
2669 struct beacon_data *beacon = NULL;
2670 struct sk_buff *skb = NULL;
2671 struct ieee80211_tx_info *info;
2672 struct ieee80211_sub_if_data *sdata = NULL;
2673 enum ieee80211_band band;
2674 struct ieee80211_tx_rate_control txrc;
2675 struct ieee80211_chanctx_conf *chanctx_conf;
2676 int csa_off_base = 0;
2680 sdata = vif_to_sdata(vif);
2681 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2683 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2687 memset(offs, 0, sizeof(*offs));
2689 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2690 struct ieee80211_if_ap *ap = &sdata->u.ap;
2692 beacon = rcu_dereference(ap->beacon);
2694 if (beacon->csa_counter_offsets[0]) {
2696 ieee80211_csa_update_counter(vif);
2698 ieee80211_set_csa(sdata, beacon);
2702 * headroom, head length,
2703 * tail length and maximum TIM length
2705 skb = dev_alloc_skb(local->tx_headroom +
2707 beacon->tail_len + 256 +
2708 local->hw.extra_beacon_tailroom);
2712 skb_reserve(skb, local->tx_headroom);
2713 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2716 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
2720 offs->tim_offset = beacon->head_len;
2721 offs->tim_length = skb->len - beacon->head_len;
2723 /* for AP the csa offsets are from tail */
2724 csa_off_base = skb->len;
2728 memcpy(skb_put(skb, beacon->tail_len),
2729 beacon->tail, beacon->tail_len);
2732 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2733 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2734 struct ieee80211_hdr *hdr;
2736 beacon = rcu_dereference(ifibss->presp);
2740 if (beacon->csa_counter_offsets[0]) {
2742 ieee80211_csa_update_counter(vif);
2744 ieee80211_set_csa(sdata, beacon);
2747 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
2748 local->hw.extra_beacon_tailroom);
2751 skb_reserve(skb, local->tx_headroom);
2752 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2755 hdr = (struct ieee80211_hdr *) skb->data;
2756 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2757 IEEE80211_STYPE_BEACON);
2758 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2759 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2761 beacon = rcu_dereference(ifmsh->beacon);
2765 if (beacon->csa_counter_offsets[0]) {
2767 /* TODO: For mesh csa_counter is in TU, so
2768 * decrementing it by one isn't correct, but
2769 * for now we leave it consistent with overall
2770 * mac80211's behavior.
2772 ieee80211_csa_update_counter(vif);
2774 ieee80211_set_csa(sdata, beacon);
2777 if (ifmsh->sync_ops)
2778 ifmsh->sync_ops->adjust_tbtt(sdata, beacon);
2780 skb = dev_alloc_skb(local->tx_headroom +
2784 local->hw.extra_beacon_tailroom);
2787 skb_reserve(skb, local->tx_headroom);
2788 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2790 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
2793 offs->tim_offset = beacon->head_len;
2794 offs->tim_length = skb->len - beacon->head_len;
2797 memcpy(skb_put(skb, beacon->tail_len), beacon->tail,
2805 if (offs && beacon) {
2808 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
2809 u16 csa_off = beacon->csa_counter_offsets[i];
2814 offs->csa_counter_offs[i] = csa_off_base + csa_off;
2818 band = chanctx_conf->def.chan->band;
2820 info = IEEE80211_SKB_CB(skb);
2822 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2823 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2826 memset(&txrc, 0, sizeof(txrc));
2828 txrc.sband = local->hw.wiphy->bands[band];
2829 txrc.bss_conf = &sdata->vif.bss_conf;
2831 txrc.reported_rate.idx = -1;
2832 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2833 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2834 txrc.max_rate_idx = -1;
2836 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2838 rate_control_get_rate(sdata, NULL, &txrc);
2840 info->control.vif = vif;
2842 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2843 IEEE80211_TX_CTL_ASSIGN_SEQ |
2844 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2852 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
2853 struct ieee80211_vif *vif,
2854 struct ieee80211_mutable_offsets *offs)
2856 return __ieee80211_beacon_get(hw, vif, offs, true);
2858 EXPORT_SYMBOL(ieee80211_beacon_get_template);
2860 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2861 struct ieee80211_vif *vif,
2862 u16 *tim_offset, u16 *tim_length)
2864 struct ieee80211_mutable_offsets offs = {};
2865 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
2868 *tim_offset = offs.tim_offset;
2871 *tim_length = offs.tim_length;
2875 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2877 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2878 struct ieee80211_vif *vif)
2880 struct ieee80211_if_ap *ap = NULL;
2881 struct sk_buff *skb = NULL;
2882 struct probe_resp *presp = NULL;
2883 struct ieee80211_hdr *hdr;
2884 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2886 if (sdata->vif.type != NL80211_IFTYPE_AP)
2892 presp = rcu_dereference(ap->probe_resp);
2896 skb = dev_alloc_skb(presp->len);
2900 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2902 hdr = (struct ieee80211_hdr *) skb->data;
2903 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2909 EXPORT_SYMBOL(ieee80211_proberesp_get);
2911 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2912 struct ieee80211_vif *vif)
2914 struct ieee80211_sub_if_data *sdata;
2915 struct ieee80211_if_managed *ifmgd;
2916 struct ieee80211_pspoll *pspoll;
2917 struct ieee80211_local *local;
2918 struct sk_buff *skb;
2920 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2923 sdata = vif_to_sdata(vif);
2924 ifmgd = &sdata->u.mgd;
2925 local = sdata->local;
2927 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2931 skb_reserve(skb, local->hw.extra_tx_headroom);
2933 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2934 memset(pspoll, 0, sizeof(*pspoll));
2935 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2936 IEEE80211_STYPE_PSPOLL);
2937 pspoll->aid = cpu_to_le16(ifmgd->aid);
2939 /* aid in PS-Poll has its two MSBs each set to 1 */
2940 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2942 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2943 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2947 EXPORT_SYMBOL(ieee80211_pspoll_get);
2949 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2950 struct ieee80211_vif *vif)
2952 struct ieee80211_hdr_3addr *nullfunc;
2953 struct ieee80211_sub_if_data *sdata;
2954 struct ieee80211_if_managed *ifmgd;
2955 struct ieee80211_local *local;
2956 struct sk_buff *skb;
2958 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2961 sdata = vif_to_sdata(vif);
2962 ifmgd = &sdata->u.mgd;
2963 local = sdata->local;
2965 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2969 skb_reserve(skb, local->hw.extra_tx_headroom);
2971 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2973 memset(nullfunc, 0, sizeof(*nullfunc));
2974 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2975 IEEE80211_STYPE_NULLFUNC |
2976 IEEE80211_FCTL_TODS);
2977 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2978 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2979 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2983 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2985 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2987 const u8 *ssid, size_t ssid_len,
2990 struct ieee80211_local *local = hw_to_local(hw);
2991 struct ieee80211_hdr_3addr *hdr;
2992 struct sk_buff *skb;
2996 ie_ssid_len = 2 + ssid_len;
2998 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2999 ie_ssid_len + tailroom);
3003 skb_reserve(skb, local->hw.extra_tx_headroom);
3005 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
3006 memset(hdr, 0, sizeof(*hdr));
3007 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3008 IEEE80211_STYPE_PROBE_REQ);
3009 eth_broadcast_addr(hdr->addr1);
3010 memcpy(hdr->addr2, src_addr, ETH_ALEN);
3011 eth_broadcast_addr(hdr->addr3);
3013 pos = skb_put(skb, ie_ssid_len);
3014 *pos++ = WLAN_EID_SSID;
3017 memcpy(pos, ssid, ssid_len);
3022 EXPORT_SYMBOL(ieee80211_probereq_get);
3024 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3025 const void *frame, size_t frame_len,
3026 const struct ieee80211_tx_info *frame_txctl,
3027 struct ieee80211_rts *rts)
3029 const struct ieee80211_hdr *hdr = frame;
3031 rts->frame_control =
3032 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
3033 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
3035 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
3036 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
3038 EXPORT_SYMBOL(ieee80211_rts_get);
3040 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
3041 const void *frame, size_t frame_len,
3042 const struct ieee80211_tx_info *frame_txctl,
3043 struct ieee80211_cts *cts)
3045 const struct ieee80211_hdr *hdr = frame;
3047 cts->frame_control =
3048 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
3049 cts->duration = ieee80211_ctstoself_duration(hw, vif,
3050 frame_len, frame_txctl);
3051 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
3053 EXPORT_SYMBOL(ieee80211_ctstoself_get);
3056 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
3057 struct ieee80211_vif *vif)
3059 struct ieee80211_local *local = hw_to_local(hw);
3060 struct sk_buff *skb = NULL;
3061 struct ieee80211_tx_data tx;
3062 struct ieee80211_sub_if_data *sdata;
3064 struct ieee80211_tx_info *info;
3065 struct ieee80211_chanctx_conf *chanctx_conf;
3067 sdata = vif_to_sdata(vif);
3070 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
3075 if (sdata->vif.type == NL80211_IFTYPE_AP) {
3076 struct beacon_data *beacon =
3077 rcu_dereference(sdata->u.ap.beacon);
3079 if (!beacon || !beacon->head)
3082 ps = &sdata->u.ap.ps;
3083 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3084 ps = &sdata->u.mesh.ps;
3089 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
3090 goto out; /* send buffered bc/mc only after DTIM beacon */
3093 skb = skb_dequeue(&ps->bc_buf);
3096 local->total_ps_buffered--;
3098 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
3099 struct ieee80211_hdr *hdr =
3100 (struct ieee80211_hdr *) skb->data;
3101 /* more buffered multicast/broadcast frames ==> set
3102 * MoreData flag in IEEE 802.11 header to inform PS
3104 hdr->frame_control |=
3105 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
3108 if (sdata->vif.type == NL80211_IFTYPE_AP)
3109 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
3110 if (!ieee80211_tx_prepare(sdata, &tx, skb))
3112 dev_kfree_skb_any(skb);
3115 info = IEEE80211_SKB_CB(skb);
3117 tx.flags |= IEEE80211_TX_PS_BUFFERED;
3118 info->band = chanctx_conf->def.chan->band;
3120 if (invoke_tx_handlers(&tx))
3127 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
3129 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3131 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3132 struct ieee80211_sub_if_data *sdata = sta->sdata;
3133 struct ieee80211_local *local = sdata->local;
3137 lockdep_assert_held(&local->sta_mtx);
3139 /* only some cases are supported right now */
3140 switch (sdata->vif.type) {
3141 case NL80211_IFTYPE_STATION:
3142 case NL80211_IFTYPE_AP:
3143 case NL80211_IFTYPE_AP_VLAN:
3150 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
3153 if (sta->reserved_tid == tid) {
3158 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
3159 sdata_err(sdata, "TID reservation already active\n");
3164 ieee80211_stop_vif_queues(sdata->local, sdata,
3165 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3169 /* Tear down BA sessions so we stop aggregating on this TID */
3170 if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) {
3171 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
3172 __ieee80211_stop_tx_ba_session(sta, tid,
3173 AGG_STOP_LOCAL_REQUEST);
3176 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
3177 __ieee80211_flush_queues(local, sdata, queues, false);
3179 sta->reserved_tid = tid;
3181 ieee80211_wake_vif_queues(local, sdata,
3182 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
3184 if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)
3185 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
3191 EXPORT_SYMBOL(ieee80211_reserve_tid);
3193 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
3195 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3196 struct ieee80211_sub_if_data *sdata = sta->sdata;
3198 lockdep_assert_held(&sdata->local->sta_mtx);
3200 /* only some cases are supported right now */
3201 switch (sdata->vif.type) {
3202 case NL80211_IFTYPE_STATION:
3203 case NL80211_IFTYPE_AP:
3204 case NL80211_IFTYPE_AP_VLAN:
3211 if (tid != sta->reserved_tid) {
3212 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
3216 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
3218 EXPORT_SYMBOL(ieee80211_unreserve_tid);
3220 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
3221 struct sk_buff *skb, int tid,
3222 enum ieee80211_band band)
3224 int ac = ieee802_1d_to_ac[tid & 7];
3226 skb_set_mac_header(skb, 0);
3227 skb_set_network_header(skb, 0);
3228 skb_set_transport_header(skb, 0);
3230 skb_set_queue_mapping(skb, ac);
3231 skb->priority = tid;
3233 skb->dev = sdata->dev;
3236 * The other path calling ieee80211_xmit is from the tasklet,
3237 * and while we can handle concurrent transmissions locking
3238 * requirements are that we do not come into tx with bhs on.
3241 IEEE80211_SKB_CB(skb)->band = band;
3242 ieee80211_xmit(sdata, skb);