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>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
40 struct sk_buff *skb, int group_addr,
43 int rate, mrate, erp, dur, i;
44 struct ieee80211_rate *txrate;
45 struct ieee80211_local *local = tx->local;
46 struct ieee80211_supported_band *sband;
47 struct ieee80211_hdr *hdr;
48 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
50 /* assume HW handles this */
51 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
55 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
58 sband = local->hw.wiphy->bands[info->band];
59 txrate = &sband->bitrates[info->control.rates[0].idx];
61 erp = txrate->flags & IEEE80211_RATE_ERP_G;
64 * data and mgmt (except PS Poll):
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
80 hdr = (struct ieee80211_hdr *)skb->data;
81 if (ieee80211_is_ctl(hdr->frame_control)) {
82 /* TODO: These control frames are not currently sent by
83 * mac80211, but should they be implemented, this function
84 * needs to be updated to support duration field calculation.
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
94 * PS Poll: BIT(15) | BIT(14) | aid
100 if (0 /* FIX: data/mgmt during CFP */)
101 return cpu_to_le16(32768);
103 if (group_addr) /* Group address as the destination - no ACK */
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 /* use lowest available if everything fails */
118 mrate = sband->bitrates[0].bitrate;
119 for (i = 0; i < sband->n_bitrates; i++) {
120 struct ieee80211_rate *r = &sband->bitrates[i];
122 if (r->bitrate > txrate->bitrate)
125 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
128 switch (sband->band) {
129 case IEEE80211_BAND_2GHZ: {
131 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
132 flag = IEEE80211_RATE_MANDATORY_G;
134 flag = IEEE80211_RATE_MANDATORY_B;
139 case IEEE80211_BAND_5GHZ:
140 if (r->flags & IEEE80211_RATE_MANDATORY_A)
143 case IEEE80211_BAND_60GHZ:
144 /* TODO, for now fall through */
145 case IEEE80211_NUM_BANDS:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
157 if (ieee80211_is_data_qos(hdr->frame_control) &&
158 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
161 /* Time needed to transmit ACK
162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
163 * to closest integer */
164 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
165 tx->sdata->vif.bss_conf.use_short_preamble);
168 /* Frame is fragmented: duration increases with time needed to
169 * transmit next fragment plus ACK and 2 x SIFS. */
170 dur *= 2; /* ACK + SIFS */
172 dur += ieee80211_frame_duration(sband->band, next_frag_len,
173 txrate->bitrate, erp,
174 tx->sdata->vif.bss_conf.use_short_preamble);
177 return cpu_to_le16(dur);
181 static ieee80211_tx_result debug_noinline
182 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
184 struct ieee80211_local *local = tx->local;
185 struct ieee80211_if_managed *ifmgd;
187 /* driver doesn't support power save */
188 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
191 /* hardware does dynamic power save */
192 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
195 /* dynamic power save disabled */
196 if (local->hw.conf.dynamic_ps_timeout <= 0)
199 /* we are scanning, don't enable power save */
203 if (!local->ps_sdata)
206 /* No point if we're going to suspend */
207 if (local->quiescing)
210 /* dynamic ps is supported only in managed mode */
211 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
214 ifmgd = &tx->sdata->u.mgd;
217 * Don't wakeup from power save if u-apsd is enabled, voip ac has
218 * u-apsd enabled and the frame is in voip class. This effectively
219 * means that even if all access categories have u-apsd enabled, in
220 * practise u-apsd is only used with the voip ac. This is a
221 * workaround for the case when received voip class packets do not
222 * have correct qos tag for some reason, due the network or the
225 * Note: ifmgd->uapsd_queues access is racy here. If the value is
226 * changed via debugfs, user needs to reassociate manually to have
227 * everything in sync.
229 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
230 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
231 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
234 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
235 ieee80211_stop_queues_by_reason(&local->hw,
236 IEEE80211_QUEUE_STOP_REASON_PS);
237 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
238 ieee80211_queue_work(&local->hw,
239 &local->dynamic_ps_disable_work);
242 /* Don't restart the timer if we're not disassociated */
243 if (!ifmgd->associated)
246 mod_timer(&local->dynamic_ps_timer, jiffies +
247 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
252 static ieee80211_tx_result debug_noinline
253 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
256 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
257 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
260 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
263 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
264 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
265 !ieee80211_is_probe_req(hdr->frame_control) &&
266 !ieee80211_is_nullfunc(hdr->frame_control))
268 * When software scanning only nullfunc frames (to notify
269 * the sleep state to the AP) and probe requests (for the
270 * active scan) are allowed, all other frames should not be
271 * sent and we should not get here, but if we do
272 * nonetheless, drop them to avoid sending them
273 * off-channel. See the link below and
274 * ieee80211_start_scan() for more.
276 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
280 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
283 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
286 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
290 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
292 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
293 if (unlikely(!assoc &&
294 ieee80211_is_data(hdr->frame_control))) {
295 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
296 sdata_info(tx->sdata,
297 "dropped data frame to not associated station %pM\n",
300 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
303 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
304 ieee80211_is_data(hdr->frame_control) &&
305 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
307 * No associated STAs - no need to send multicast
316 /* This function is called whenever the AP is about to exceed the maximum limit
317 * of buffered frames for power saving STAs. This situation should not really
318 * happen often during normal operation, so dropping the oldest buffered packet
319 * from each queue should be OK to make some room for new frames. */
320 static void purge_old_ps_buffers(struct ieee80211_local *local)
322 int total = 0, purged = 0;
324 struct ieee80211_sub_if_data *sdata;
325 struct sta_info *sta;
327 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
330 if (sdata->vif.type == NL80211_IFTYPE_AP)
331 ps = &sdata->u.ap.ps;
335 skb = skb_dequeue(&ps->bc_buf);
340 total += skb_queue_len(&ps->bc_buf);
344 * Drop one frame from each station from the lowest-priority
345 * AC that has frames at all.
347 list_for_each_entry_rcu(sta, &local->sta_list, list) {
350 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
351 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
352 total += skb_queue_len(&sta->ps_tx_buf[ac]);
355 ieee80211_free_txskb(&local->hw, skb);
361 local->total_ps_buffered = total;
362 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
365 static ieee80211_tx_result
366 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
368 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
369 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
373 * broadcast/multicast frame
375 * If any of the associated stations is in power save mode,
376 * the frame is buffered to be sent after DTIM beacon frame.
377 * This is done either by the hardware or us.
380 /* powersaving STAs currently only in AP/VLAN mode */
381 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
382 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
386 ps = &tx->sdata->bss->ps;
392 /* no buffering for ordered frames */
393 if (ieee80211_has_order(hdr->frame_control))
396 /* no stations in PS mode */
397 if (!atomic_read(&ps->num_sta_ps))
400 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
401 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
402 info->hw_queue = tx->sdata->vif.cab_queue;
404 /* device releases frame after DTIM beacon */
405 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
408 /* buffered in mac80211 */
409 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
410 purge_old_ps_buffers(tx->local);
412 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
414 "BC TX buffer full - dropping the oldest frame\n");
415 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
417 tx->local->total_ps_buffered++;
419 skb_queue_tail(&ps->bc_buf, tx->skb);
424 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
427 if (!ieee80211_is_mgmt(fc))
430 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
433 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
440 static ieee80211_tx_result
441 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
443 struct sta_info *sta = tx->sta;
444 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
445 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
446 struct ieee80211_local *local = tx->local;
451 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
452 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
453 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
454 int ac = skb_get_queue_mapping(tx->skb);
456 /* only deauth, disassoc and action are bufferable MMPDUs */
457 if (ieee80211_is_mgmt(hdr->frame_control) &&
458 !ieee80211_is_deauth(hdr->frame_control) &&
459 !ieee80211_is_disassoc(hdr->frame_control) &&
460 !ieee80211_is_action(hdr->frame_control)) {
461 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
465 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
466 sta->sta.addr, sta->sta.aid, ac);
467 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
468 purge_old_ps_buffers(tx->local);
469 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
470 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
472 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
474 ieee80211_free_txskb(&local->hw, old);
476 tx->local->total_ps_buffered++;
478 info->control.jiffies = jiffies;
479 info->control.vif = &tx->sdata->vif;
480 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
481 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
483 if (!timer_pending(&local->sta_cleanup))
484 mod_timer(&local->sta_cleanup,
485 round_jiffies(jiffies +
486 STA_INFO_CLEANUP_INTERVAL));
489 * We queued up some frames, so the TIM bit might
490 * need to be set, recalculate it.
492 sta_info_recalc_tim(sta);
495 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
497 "STA %pM in PS mode, but polling/in SP -> send frame\n",
504 static ieee80211_tx_result debug_noinline
505 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
507 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
510 if (tx->flags & IEEE80211_TX_UNICAST)
511 return ieee80211_tx_h_unicast_ps_buf(tx);
513 return ieee80211_tx_h_multicast_ps_buf(tx);
516 static ieee80211_tx_result debug_noinline
517 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
519 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
521 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
522 tx->sdata->control_port_no_encrypt))
523 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
528 static ieee80211_tx_result debug_noinline
529 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
531 struct ieee80211_key *key;
532 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
533 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
535 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
537 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
539 else if (ieee80211_is_mgmt(hdr->frame_control) &&
540 is_multicast_ether_addr(hdr->addr1) &&
541 ieee80211_is_robust_mgmt_frame(hdr) &&
542 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
544 else if (is_multicast_ether_addr(hdr->addr1) &&
545 (key = rcu_dereference(tx->sdata->default_multicast_key)))
547 else if (!is_multicast_ether_addr(hdr->addr1) &&
548 (key = rcu_dereference(tx->sdata->default_unicast_key)))
550 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
552 else if (!tx->sdata->drop_unencrypted)
554 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
556 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
557 !(ieee80211_is_action(hdr->frame_control) &&
558 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
560 else if (ieee80211_is_mgmt(hdr->frame_control) &&
561 !ieee80211_is_robust_mgmt_frame(hdr))
564 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
569 bool skip_hw = false;
571 tx->key->tx_rx_count++;
572 /* TODO: add threshold stuff again */
574 switch (tx->key->conf.cipher) {
575 case WLAN_CIPHER_SUITE_WEP40:
576 case WLAN_CIPHER_SUITE_WEP104:
577 case WLAN_CIPHER_SUITE_TKIP:
578 if (!ieee80211_is_data_present(hdr->frame_control))
581 case WLAN_CIPHER_SUITE_CCMP:
582 if (!ieee80211_is_data_present(hdr->frame_control) &&
583 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
587 skip_hw = (tx->key->conf.flags &
588 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
589 ieee80211_is_mgmt(hdr->frame_control);
591 case WLAN_CIPHER_SUITE_AES_CMAC:
592 if (!ieee80211_is_mgmt(hdr->frame_control))
597 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
600 if (!skip_hw && tx->key &&
601 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
602 info->control.hw_key = &tx->key->conf;
608 static ieee80211_tx_result debug_noinline
609 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
611 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
612 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
613 struct ieee80211_supported_band *sband;
614 struct ieee80211_rate *rate;
617 bool inval = false, rts = false, short_preamble = false;
618 struct ieee80211_tx_rate_control txrc;
621 memset(&txrc, 0, sizeof(txrc));
623 sband = tx->local->hw.wiphy->bands[info->band];
625 len = min_t(u32, tx->skb->len + FCS_LEN,
626 tx->local->hw.wiphy->frag_threshold);
628 /* set up the tx rate control struct we give the RC algo */
629 txrc.hw = &tx->local->hw;
631 txrc.bss_conf = &tx->sdata->vif.bss_conf;
633 txrc.reported_rate.idx = -1;
634 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
635 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
636 txrc.max_rate_idx = -1;
638 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
639 memcpy(txrc.rate_idx_mcs_mask,
640 tx->sdata->rc_rateidx_mcs_mask[info->band],
641 sizeof(txrc.rate_idx_mcs_mask));
642 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
643 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
644 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
646 /* set up RTS protection if desired */
647 if (len > tx->local->hw.wiphy->rts_threshold) {
648 txrc.rts = rts = true;
652 * Use short preamble if the BSS can handle it, but not for
653 * management frames unless we know the receiver can handle
654 * that -- the management frame might be to a station that
655 * just wants a probe response.
657 if (tx->sdata->vif.bss_conf.use_short_preamble &&
658 (ieee80211_is_data(hdr->frame_control) ||
659 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
660 txrc.short_preamble = short_preamble = true;
663 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
666 * Lets not bother rate control if we're associated and cannot
667 * talk to the sta. This should not happen.
669 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
670 !rate_usable_index_exists(sband, &tx->sta->sta),
671 "%s: Dropped data frame as no usable bitrate found while "
672 "scanning and associated. Target station: "
673 "%pM on %d GHz band\n",
674 tx->sdata->name, hdr->addr1,
679 * If we're associated with the sta at this point we know we can at
680 * least send the frame at the lowest bit rate.
682 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
684 if (unlikely(info->control.rates[0].idx < 0))
687 if (txrc.reported_rate.idx < 0) {
688 txrc.reported_rate = info->control.rates[0];
689 if (tx->sta && ieee80211_is_data(hdr->frame_control))
690 tx->sta->last_tx_rate = txrc.reported_rate;
692 tx->sta->last_tx_rate = txrc.reported_rate;
694 if (unlikely(!info->control.rates[0].count))
695 info->control.rates[0].count = 1;
697 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
698 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
699 info->control.rates[0].count = 1;
701 if (is_multicast_ether_addr(hdr->addr1)) {
703 * XXX: verify the rate is in the basic rateset
709 * set up the RTS/CTS rate as the fastest basic rate
710 * that is not faster than the data rate
712 * XXX: Should this check all retry rates?
714 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
717 rate = &sband->bitrates[info->control.rates[0].idx];
719 for (i = 0; i < sband->n_bitrates; i++) {
720 /* must be a basic rate */
721 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
723 /* must not be faster than the data rate */
724 if (sband->bitrates[i].bitrate > rate->bitrate)
727 if (sband->bitrates[baserate].bitrate <
728 sband->bitrates[i].bitrate)
732 info->control.rts_cts_rate_idx = baserate;
735 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
737 * make sure there's no valid rate following
738 * an invalid one, just in case drivers don't
739 * take the API seriously to stop at -1.
742 info->control.rates[i].idx = -1;
745 if (info->control.rates[i].idx < 0) {
751 * For now assume MCS is already set up correctly, this
754 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
755 WARN_ON(info->control.rates[i].idx > 76);
759 /* set up RTS protection if desired */
761 info->control.rates[i].flags |=
762 IEEE80211_TX_RC_USE_RTS_CTS;
765 if (WARN_ON_ONCE(info->control.rates[i].idx >=
766 sband->n_bitrates)) {
767 info->control.rates[i].idx = -1;
771 rate = &sband->bitrates[info->control.rates[i].idx];
773 /* set up short preamble */
774 if (short_preamble &&
775 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
776 info->control.rates[i].flags |=
777 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
779 /* set up G protection */
780 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
781 rate->flags & IEEE80211_RATE_ERP_G)
782 info->control.rates[i].flags |=
783 IEEE80211_TX_RC_USE_CTS_PROTECT;
789 static ieee80211_tx_result debug_noinline
790 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
792 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
793 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
799 * Packet injection may want to control the sequence
800 * number, if we have no matching interface then we
801 * neither assign one ourselves nor ask the driver to.
803 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
806 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
809 if (ieee80211_hdrlen(hdr->frame_control) < 24)
812 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
816 * Anything but QoS data that has a sequence number field
817 * (is long enough) gets a sequence number from the global
820 if (!ieee80211_is_data_qos(hdr->frame_control)) {
821 /* driver should assign sequence number */
822 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
823 /* for pure STA mode without beacons, we can do it */
824 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
825 tx->sdata->sequence_number += 0x10;
830 * This should be true for injected/management frames only, for
831 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
832 * above since they are not QoS-data frames.
837 /* include per-STA, per-TID sequence counter */
839 qc = ieee80211_get_qos_ctl(hdr);
840 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
841 seq = &tx->sta->tid_seq[tid];
843 hdr->seq_ctrl = cpu_to_le16(*seq);
845 /* Increase the sequence number. */
846 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
851 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
852 struct sk_buff *skb, int hdrlen,
855 struct ieee80211_local *local = tx->local;
856 struct ieee80211_tx_info *info;
858 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
859 int pos = hdrlen + per_fragm;
860 int rem = skb->len - hdrlen - per_fragm;
862 if (WARN_ON(rem < 0))
865 /* first fragment was already added to queue by caller */
868 int fraglen = per_fragm;
873 tmp = dev_alloc_skb(local->tx_headroom +
875 IEEE80211_ENCRYPT_HEADROOM +
876 IEEE80211_ENCRYPT_TAILROOM);
880 __skb_queue_tail(&tx->skbs, tmp);
882 skb_reserve(tmp, local->tx_headroom +
883 IEEE80211_ENCRYPT_HEADROOM);
884 /* copy control information */
885 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
887 info = IEEE80211_SKB_CB(tmp);
888 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
889 IEEE80211_TX_CTL_FIRST_FRAGMENT);
892 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
894 skb_copy_queue_mapping(tmp, skb);
895 tmp->priority = skb->priority;
898 /* copy header and data */
899 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
900 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
905 /* adjust first fragment's length */
906 skb->len = hdrlen + per_fragm;
910 static ieee80211_tx_result debug_noinline
911 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
913 struct sk_buff *skb = tx->skb;
914 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
915 struct ieee80211_hdr *hdr = (void *)skb->data;
916 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
920 /* no matter what happens, tx->skb moves to tx->skbs */
921 __skb_queue_tail(&tx->skbs, skb);
924 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
927 if (tx->local->ops->set_frag_threshold)
931 * Warn when submitting a fragmented A-MPDU frame and drop it.
932 * This scenario is handled in ieee80211_tx_prepare but extra
933 * caution taken here as fragmented ampdu may cause Tx stop.
935 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
938 hdrlen = ieee80211_hdrlen(hdr->frame_control);
940 /* internal error, why isn't DONTFRAG set? */
941 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
945 * Now fragment the frame. This will allocate all the fragments and
946 * chain them (using skb as the first fragment) to skb->next.
947 * During transmission, we will remove the successfully transmitted
948 * fragments from this list. When the low-level driver rejects one
949 * of the fragments then we will simply pretend to accept the skb
950 * but store it away as pending.
952 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
955 /* update duration/seq/flags of fragments */
958 skb_queue_walk(&tx->skbs, skb) {
959 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
961 hdr = (void *)skb->data;
962 info = IEEE80211_SKB_CB(skb);
964 if (!skb_queue_is_last(&tx->skbs, skb)) {
965 hdr->frame_control |= morefrags;
967 * No multi-rate retries for fragmented frames, that
968 * would completely throw off the NAV at other STAs.
970 info->control.rates[1].idx = -1;
971 info->control.rates[2].idx = -1;
972 info->control.rates[3].idx = -1;
973 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
974 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
976 hdr->frame_control &= ~morefrags;
978 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
985 static ieee80211_tx_result debug_noinline
986 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
993 tx->sta->tx_packets++;
994 skb_queue_walk(&tx->skbs, skb) {
995 tx->sta->tx_fragments++;
996 tx->sta->tx_bytes += skb->len;
1002 static ieee80211_tx_result debug_noinline
1003 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1008 switch (tx->key->conf.cipher) {
1009 case WLAN_CIPHER_SUITE_WEP40:
1010 case WLAN_CIPHER_SUITE_WEP104:
1011 return ieee80211_crypto_wep_encrypt(tx);
1012 case WLAN_CIPHER_SUITE_TKIP:
1013 return ieee80211_crypto_tkip_encrypt(tx);
1014 case WLAN_CIPHER_SUITE_CCMP:
1015 return ieee80211_crypto_ccmp_encrypt(tx);
1016 case WLAN_CIPHER_SUITE_AES_CMAC:
1017 return ieee80211_crypto_aes_cmac_encrypt(tx);
1019 return ieee80211_crypto_hw_encrypt(tx);
1025 static ieee80211_tx_result debug_noinline
1026 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1028 struct sk_buff *skb;
1029 struct ieee80211_hdr *hdr;
1033 skb_queue_walk(&tx->skbs, skb) {
1034 hdr = (void *) skb->data;
1035 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1036 break; /* must not overwrite AID */
1037 if (!skb_queue_is_last(&tx->skbs, skb)) {
1038 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1039 next_len = next->len;
1042 group_addr = is_multicast_ether_addr(hdr->addr1);
1045 ieee80211_duration(tx, skb, group_addr, next_len);
1051 /* actual transmit path */
1053 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1054 struct sk_buff *skb,
1055 struct ieee80211_tx_info *info,
1056 struct tid_ampdu_tx *tid_tx,
1059 bool queued = false;
1060 bool reset_agg_timer = false;
1061 struct sk_buff *purge_skb = NULL;
1063 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1064 info->flags |= IEEE80211_TX_CTL_AMPDU;
1065 reset_agg_timer = true;
1066 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1068 * nothing -- this aggregation session is being started
1069 * but that might still fail with the driver
1072 spin_lock(&tx->sta->lock);
1074 * Need to re-check now, because we may get here
1076 * 1) in the window during which the setup is actually
1077 * already done, but not marked yet because not all
1078 * packets are spliced over to the driver pending
1079 * queue yet -- if this happened we acquire the lock
1080 * either before or after the splice happens, but
1081 * need to recheck which of these cases happened.
1083 * 2) during session teardown, if the OPERATIONAL bit
1084 * was cleared due to the teardown but the pointer
1085 * hasn't been assigned NULL yet (or we loaded it
1086 * before it was assigned) -- in this case it may
1087 * now be NULL which means we should just let the
1088 * packet pass through because splicing the frames
1089 * back is already done.
1091 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1094 /* do nothing, let packet pass through */
1095 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1096 info->flags |= IEEE80211_TX_CTL_AMPDU;
1097 reset_agg_timer = true;
1100 info->control.vif = &tx->sdata->vif;
1101 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1102 __skb_queue_tail(&tid_tx->pending, skb);
1103 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1104 purge_skb = __skb_dequeue(&tid_tx->pending);
1106 spin_unlock(&tx->sta->lock);
1109 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1112 /* reset session timer */
1113 if (reset_agg_timer && tid_tx->timeout)
1114 tid_tx->last_tx = jiffies;
1122 static ieee80211_tx_result
1123 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1124 struct ieee80211_tx_data *tx,
1125 struct sk_buff *skb)
1127 struct ieee80211_local *local = sdata->local;
1128 struct ieee80211_hdr *hdr;
1129 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1133 memset(tx, 0, sizeof(*tx));
1137 __skb_queue_head_init(&tx->skbs);
1140 * If this flag is set to true anywhere, and we get here,
1141 * we are doing the needed processing, so remove the flag
1144 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1146 hdr = (struct ieee80211_hdr *) skb->data;
1148 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1149 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1150 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1152 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1153 tx->sdata->control_port_protocol == tx->skb->protocol) {
1154 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1157 tx->sta = sta_info_get(sdata, hdr->addr1);
1159 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1160 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1161 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1162 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1163 struct tid_ampdu_tx *tid_tx;
1165 qc = ieee80211_get_qos_ctl(hdr);
1166 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1168 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1172 queued = ieee80211_tx_prep_agg(tx, skb, info,
1175 if (unlikely(queued))
1180 if (is_multicast_ether_addr(hdr->addr1)) {
1181 tx->flags &= ~IEEE80211_TX_UNICAST;
1182 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1184 tx->flags |= IEEE80211_TX_UNICAST;
1186 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1187 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1188 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1189 info->flags & IEEE80211_TX_CTL_AMPDU)
1190 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1194 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1195 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1196 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1198 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1203 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1204 struct ieee80211_vif *vif,
1205 struct ieee80211_sta *sta,
1206 struct sk_buff_head *skbs,
1209 struct ieee80211_tx_control control;
1210 struct sk_buff *skb, *tmp;
1211 unsigned long flags;
1213 skb_queue_walk_safe(skbs, skb, tmp) {
1214 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1215 int q = info->hw_queue;
1217 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1218 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1219 __skb_unlink(skb, skbs);
1220 ieee80211_free_txskb(&local->hw, skb);
1225 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1226 if (local->queue_stop_reasons[q] ||
1227 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1229 * Since queue is stopped, queue up frames for later
1230 * transmission from the tx-pending tasklet when the
1231 * queue is woken again.
1234 skb_queue_splice_init(skbs, &local->pending[q]);
1236 skb_queue_splice_tail_init(skbs,
1237 &local->pending[q]);
1239 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1243 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1245 info->control.vif = vif;
1248 __skb_unlink(skb, skbs);
1249 drv_tx(local, &control, skb);
1256 * Returns false if the frame couldn't be transmitted but was queued instead.
1258 static bool __ieee80211_tx(struct ieee80211_local *local,
1259 struct sk_buff_head *skbs, int led_len,
1260 struct sta_info *sta, bool txpending)
1262 struct ieee80211_tx_info *info;
1263 struct ieee80211_sub_if_data *sdata;
1264 struct ieee80211_vif *vif;
1265 struct ieee80211_sta *pubsta;
1266 struct sk_buff *skb;
1270 if (WARN_ON(skb_queue_empty(skbs)))
1273 skb = skb_peek(skbs);
1274 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1275 info = IEEE80211_SKB_CB(skb);
1276 sdata = vif_to_sdata(info->control.vif);
1277 if (sta && !sta->uploaded)
1285 switch (sdata->vif.type) {
1286 case NL80211_IFTYPE_MONITOR:
1287 sdata = rcu_dereference(local->monitor_sdata);
1291 vif->hw_queue[skb_get_queue_mapping(skb)];
1292 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1298 case NL80211_IFTYPE_AP_VLAN:
1299 sdata = container_of(sdata->bss,
1300 struct ieee80211_sub_if_data, u.ap);
1307 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1310 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1311 ieee80211_led_tx(local, 1);
1313 WARN_ON_ONCE(!skb_queue_empty(skbs));
1319 * Invoke TX handlers, return 0 on success and non-zero if the
1320 * frame was dropped or queued.
1322 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1324 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1325 ieee80211_tx_result res = TX_DROP;
1327 #define CALL_TXH(txh) \
1330 if (res != TX_CONTINUE) \
1334 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1335 CALL_TXH(ieee80211_tx_h_check_assoc);
1336 CALL_TXH(ieee80211_tx_h_ps_buf);
1337 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1338 CALL_TXH(ieee80211_tx_h_select_key);
1339 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1340 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1342 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1343 __skb_queue_tail(&tx->skbs, tx->skb);
1348 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1349 CALL_TXH(ieee80211_tx_h_sequence);
1350 CALL_TXH(ieee80211_tx_h_fragment);
1351 /* handlers after fragment must be aware of tx info fragmentation! */
1352 CALL_TXH(ieee80211_tx_h_stats);
1353 CALL_TXH(ieee80211_tx_h_encrypt);
1354 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1355 CALL_TXH(ieee80211_tx_h_calculate_duration);
1359 if (unlikely(res == TX_DROP)) {
1360 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1362 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1364 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1366 } else if (unlikely(res == TX_QUEUED)) {
1367 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1375 * Returns false if the frame couldn't be transmitted but was queued instead.
1377 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1378 struct sk_buff *skb, bool txpending,
1379 enum ieee80211_band band)
1381 struct ieee80211_local *local = sdata->local;
1382 struct ieee80211_tx_data tx;
1383 ieee80211_tx_result res_prepare;
1384 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1388 if (unlikely(skb->len < 10)) {
1393 /* initialises tx */
1395 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1397 if (unlikely(res_prepare == TX_DROP)) {
1398 ieee80211_free_txskb(&local->hw, skb);
1400 } else if (unlikely(res_prepare == TX_QUEUED)) {
1406 /* set up hw_queue value early */
1407 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1408 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1410 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1412 if (!invoke_tx_handlers(&tx))
1413 result = __ieee80211_tx(local, &tx.skbs, led_len,
1419 /* device xmit handlers */
1421 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1422 struct sk_buff *skb,
1423 int head_need, bool may_encrypt)
1425 struct ieee80211_local *local = sdata->local;
1428 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1429 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1430 tail_need -= skb_tailroom(skb);
1431 tail_need = max_t(int, tail_need, 0);
1434 if (skb_cloned(skb))
1435 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1436 else if (head_need || tail_need)
1437 I802_DEBUG_INC(local->tx_expand_skb_head);
1441 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1442 wiphy_debug(local->hw.wiphy,
1443 "failed to reallocate TX buffer\n");
1450 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1451 enum ieee80211_band band)
1453 struct ieee80211_local *local = sdata->local;
1454 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1455 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1459 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1461 headroom = local->tx_headroom;
1463 headroom += IEEE80211_ENCRYPT_HEADROOM;
1464 headroom -= skb_headroom(skb);
1465 headroom = max_t(int, 0, headroom);
1467 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1468 ieee80211_free_txskb(&local->hw, skb);
1472 hdr = (struct ieee80211_hdr *) skb->data;
1473 info->control.vif = &sdata->vif;
1475 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1476 ieee80211_is_data(hdr->frame_control) &&
1477 !is_multicast_ether_addr(hdr->addr1) &&
1478 mesh_nexthop_resolve(skb, sdata)) {
1479 /* skb queued: don't free */
1483 ieee80211_set_qos_hdr(sdata, skb);
1484 ieee80211_tx(sdata, skb, false, band);
1487 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1489 struct ieee80211_radiotap_iterator iterator;
1490 struct ieee80211_radiotap_header *rthdr =
1491 (struct ieee80211_radiotap_header *) skb->data;
1492 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1493 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1497 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1498 IEEE80211_TX_CTL_DONTFRAG;
1501 * for every radiotap entry that is present
1502 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1503 * entries present, or -EINVAL on error)
1507 ret = ieee80211_radiotap_iterator_next(&iterator);
1512 /* see if this argument is something we can use */
1513 switch (iterator.this_arg_index) {
1515 * You must take care when dereferencing iterator.this_arg
1516 * for multibyte types... the pointer is not aligned. Use
1517 * get_unaligned((type *)iterator.this_arg) to dereference
1518 * iterator.this_arg for type "type" safely on all arches.
1520 case IEEE80211_RADIOTAP_FLAGS:
1521 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1523 * this indicates that the skb we have been
1524 * handed has the 32-bit FCS CRC at the end...
1525 * we should react to that by snipping it off
1526 * because it will be recomputed and added
1529 if (skb->len < (iterator._max_length + FCS_LEN))
1532 skb_trim(skb, skb->len - FCS_LEN);
1534 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1535 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1536 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1537 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1540 case IEEE80211_RADIOTAP_TX_FLAGS:
1541 txflags = get_unaligned_le16(iterator.this_arg);
1542 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1543 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1547 * Please update the file
1548 * Documentation/networking/mac80211-injection.txt
1549 * when parsing new fields here.
1557 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1561 * remove the radiotap header
1562 * iterator->_max_length was sanity-checked against
1563 * skb->len by iterator init
1565 skb_pull(skb, iterator._max_length);
1570 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1571 struct net_device *dev)
1573 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1574 struct ieee80211_chanctx_conf *chanctx_conf;
1575 struct ieee80211_channel *chan;
1576 struct ieee80211_radiotap_header *prthdr =
1577 (struct ieee80211_radiotap_header *)skb->data;
1578 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1579 struct ieee80211_hdr *hdr;
1580 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1584 /* check for not even having the fixed radiotap header part */
1585 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1586 goto fail; /* too short to be possibly valid */
1588 /* is it a header version we can trust to find length from? */
1589 if (unlikely(prthdr->it_version))
1590 goto fail; /* only version 0 is supported */
1592 /* then there must be a radiotap header with a length we can use */
1593 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1595 /* does the skb contain enough to deliver on the alleged length? */
1596 if (unlikely(skb->len < len_rthdr))
1597 goto fail; /* skb too short for claimed rt header extent */
1600 * fix up the pointers accounting for the radiotap
1601 * header still being in there. We are being given
1602 * a precooked IEEE80211 header so no need for
1605 skb_set_mac_header(skb, len_rthdr);
1607 * these are just fixed to the end of the rt area since we
1608 * don't have any better information and at this point, nobody cares
1610 skb_set_network_header(skb, len_rthdr);
1611 skb_set_transport_header(skb, len_rthdr);
1613 if (skb->len < len_rthdr + 2)
1616 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1617 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1619 if (skb->len < len_rthdr + hdrlen)
1623 * Initialize skb->protocol if the injected frame is a data frame
1624 * carrying a rfc1042 header
1626 if (ieee80211_is_data(hdr->frame_control) &&
1627 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1628 u8 *payload = (u8 *)hdr + hdrlen;
1630 if (ether_addr_equal(payload, rfc1042_header))
1631 skb->protocol = cpu_to_be16((payload[6] << 8) |
1635 memset(info, 0, sizeof(*info));
1637 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1638 IEEE80211_TX_CTL_INJECTED;
1640 /* process and remove the injection radiotap header */
1641 if (!ieee80211_parse_tx_radiotap(skb))
1647 * We process outgoing injected frames that have a local address
1648 * we handle as though they are non-injected frames.
1649 * This code here isn't entirely correct, the local MAC address
1650 * isn't always enough to find the interface to use; for proper
1651 * VLAN/WDS support we will need a different mechanism (which
1652 * likely isn't going to be monitor interfaces).
1654 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1656 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1657 if (!ieee80211_sdata_running(tmp_sdata))
1659 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1660 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1661 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1663 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1669 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1670 if (!chanctx_conf) {
1671 tmp_sdata = rcu_dereference(local->monitor_sdata);
1674 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1679 chan = chanctx_conf->def.chan;
1682 * Frame injection is not allowed if beaconing is not allowed
1683 * or if we need radar detection. Beaconing is usually not allowed when
1684 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1685 * Passive scan is also used in world regulatory domains where
1686 * your country is not known and as such it should be treated as
1687 * NO TX unless the channel is explicitly allowed in which case
1688 * your current regulatory domain would not have the passive scan
1691 * Since AP mode uses monitor interfaces to inject/TX management
1692 * frames we can make AP mode the exception to this rule once it
1693 * supports radar detection as its implementation can deal with
1694 * radar detection by itself. We can do that later by adding a
1695 * monitor flag interfaces used for AP support.
1697 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1698 IEEE80211_CHAN_PASSIVE_SCAN)))
1701 ieee80211_xmit(sdata, skb, chan->band);
1704 return NETDEV_TX_OK;
1710 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1714 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1715 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1716 * @skb: packet to be sent
1717 * @dev: incoming interface
1719 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1720 * not be freed, and caller is responsible for either retrying later or freeing
1723 * This function takes in an Ethernet header and encapsulates it with suitable
1724 * IEEE 802.11 header based on which interface the packet is coming in. The
1725 * encapsulated packet will then be passed to master interface, wlan#.11, for
1726 * transmission (through low-level driver).
1728 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1729 struct net_device *dev)
1731 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1732 struct ieee80211_local *local = sdata->local;
1733 struct ieee80211_tx_info *info;
1735 u16 ethertype, hdrlen, meshhdrlen = 0;
1737 struct ieee80211_hdr hdr;
1738 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1739 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1740 const u8 *encaps_data;
1741 int encaps_len, skip_header_bytes;
1743 struct sta_info *sta = NULL;
1744 bool wme_sta = false, authorized = false, tdls_auth = false;
1745 bool tdls_direct = false;
1749 struct ieee80211_chanctx_conf *chanctx_conf;
1750 struct ieee80211_sub_if_data *ap_sdata;
1751 enum ieee80211_band band;
1753 if (unlikely(skb->len < ETH_HLEN))
1756 /* convert Ethernet header to proper 802.11 header (based on
1757 * operation mode) */
1758 ethertype = (skb->data[12] << 8) | skb->data[13];
1759 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1763 switch (sdata->vif.type) {
1764 case NL80211_IFTYPE_AP_VLAN:
1765 sta = rcu_dereference(sdata->u.vlan.sta);
1767 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1769 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1770 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1771 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1772 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1774 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1775 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1777 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1779 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1782 band = chanctx_conf->def.chan->band;
1786 case NL80211_IFTYPE_AP:
1787 if (sdata->vif.type == NL80211_IFTYPE_AP)
1788 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1791 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1793 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1794 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1795 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1797 band = chanctx_conf->def.chan->band;
1799 case NL80211_IFTYPE_WDS:
1800 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1802 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1803 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1804 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1805 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1808 * This is the exception! WDS style interfaces are prohibited
1809 * when channel contexts are in used so this must be valid
1811 band = local->hw.conf.channel->band;
1813 #ifdef CONFIG_MAC80211_MESH
1814 case NL80211_IFTYPE_MESH_POINT:
1815 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1816 /* Do not send frames with mesh_ttl == 0 */
1817 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1821 if (!is_multicast_ether_addr(skb->data)) {
1822 mpath = mesh_path_lookup(skb->data, sdata);
1824 mppath = mpp_path_lookup(skb->data, sdata);
1828 * Use address extension if it is a packet from
1829 * another interface or if we know the destination
1830 * is being proxied by a portal (i.e. portal address
1831 * differs from proxied address)
1833 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1834 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1835 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1836 skb->data, skb->data + ETH_ALEN);
1837 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1840 /* DS -> MBSS (802.11-2012 13.11.3.3).
1841 * For unicast with unknown forwarding information,
1842 * destination might be in the MBSS or if that fails
1843 * forwarded to another mesh gate. In either case
1844 * resolution will be handled in ieee80211_xmit(), so
1845 * leave the original DA. This also works for mcast */
1846 const u8 *mesh_da = skb->data;
1849 mesh_da = mppath->mpp;
1851 mesh_da = mpath->dst;
1853 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1854 mesh_da, sdata->vif.addr);
1855 if (is_multicast_ether_addr(mesh_da))
1856 /* DA TA mSA AE:SA */
1858 ieee80211_new_mesh_header(&mesh_hdr,
1860 skb->data + ETH_ALEN,
1863 /* RA TA mDA mSA AE:DA SA */
1865 ieee80211_new_mesh_header(&mesh_hdr,
1868 skb->data + ETH_ALEN);
1871 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1874 band = chanctx_conf->def.chan->band;
1877 case NL80211_IFTYPE_STATION:
1878 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1879 bool tdls_peer = false;
1881 sta = sta_info_get(sdata, skb->data);
1883 authorized = test_sta_flag(sta,
1884 WLAN_STA_AUTHORIZED);
1885 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1886 tdls_peer = test_sta_flag(sta,
1887 WLAN_STA_TDLS_PEER);
1888 tdls_auth = test_sta_flag(sta,
1889 WLAN_STA_TDLS_PEER_AUTH);
1893 * If the TDLS link is enabled, send everything
1894 * directly. Otherwise, allow TDLS setup frames
1895 * to be transmitted indirectly.
1897 tdls_direct = tdls_peer && (tdls_auth ||
1898 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1899 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1903 /* link during setup - throw out frames to peer */
1908 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1909 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1910 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1912 } else if (sdata->u.mgd.use_4addr &&
1913 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1914 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1915 IEEE80211_FCTL_TODS);
1917 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1918 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1919 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1920 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1923 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1925 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1926 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1927 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1930 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1933 band = chanctx_conf->def.chan->band;
1935 case NL80211_IFTYPE_ADHOC:
1937 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1938 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1939 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1941 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1944 band = chanctx_conf->def.chan->band;
1951 * There's no need to try to look up the destination
1952 * if it is a multicast address (which can only happen
1955 multicast = is_multicast_ether_addr(hdr.addr1);
1957 sta = sta_info_get(sdata, hdr.addr1);
1959 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1960 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1964 /* For mesh, the use of the QoS header is mandatory */
1965 if (ieee80211_vif_is_mesh(&sdata->vif))
1968 /* receiver and we are QoS enabled, use a QoS type frame */
1969 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1970 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1975 * Drop unicast frames to unauthorised stations unless they are
1976 * EAPOL frames from the local station.
1978 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1979 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1980 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1981 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1982 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1983 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1984 dev->name, hdr.addr1);
1987 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1992 if (unlikely(!multicast && skb->sk &&
1993 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1994 struct sk_buff *orig_skb = skb;
1996 skb = skb_clone(skb, GFP_ATOMIC);
1998 unsigned long flags;
2001 spin_lock_irqsave(&local->ack_status_lock, flags);
2002 r = idr_get_new_above(&local->ack_status_frames,
2005 idr_pre_get(&local->ack_status_frames,
2007 r = idr_get_new_above(&local->ack_status_frames,
2010 if (WARN_ON(!id) || id > 0xffff) {
2011 idr_remove(&local->ack_status_frames, id);
2014 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2018 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2019 } else if (skb_shared(skb)) {
2020 kfree_skb(orig_skb);
2026 /* couldn't clone -- lose tx status ... */
2032 * If the skb is shared we need to obtain our own copy.
2034 if (skb_shared(skb)) {
2035 struct sk_buff *tmp_skb = skb;
2037 /* can't happen -- skb is a clone if info_id != 0 */
2040 skb = skb_clone(skb, GFP_ATOMIC);
2047 hdr.frame_control = fc;
2048 hdr.duration_id = 0;
2051 skip_header_bytes = ETH_HLEN;
2052 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2053 encaps_data = bridge_tunnel_header;
2054 encaps_len = sizeof(bridge_tunnel_header);
2055 skip_header_bytes -= 2;
2056 } else if (ethertype >= 0x600) {
2057 encaps_data = rfc1042_header;
2058 encaps_len = sizeof(rfc1042_header);
2059 skip_header_bytes -= 2;
2065 nh_pos = skb_network_header(skb) - skb->data;
2066 h_pos = skb_transport_header(skb) - skb->data;
2068 skb_pull(skb, skip_header_bytes);
2069 nh_pos -= skip_header_bytes;
2070 h_pos -= skip_header_bytes;
2072 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2075 * So we need to modify the skb header and hence need a copy of
2076 * that. The head_need variable above doesn't, so far, include
2077 * the needed header space that we don't need right away. If we
2078 * can, then we don't reallocate right now but only after the
2079 * frame arrives at the master device (if it does...)
2081 * If we cannot, however, then we will reallocate to include all
2082 * the ever needed space. Also, if we need to reallocate it anyway,
2083 * make it big enough for everything we may ever need.
2086 if (head_need > 0 || skb_cloned(skb)) {
2087 head_need += IEEE80211_ENCRYPT_HEADROOM;
2088 head_need += local->tx_headroom;
2089 head_need = max_t(int, 0, head_need);
2090 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2091 ieee80211_free_txskb(&local->hw, skb);
2098 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2099 nh_pos += encaps_len;
2100 h_pos += encaps_len;
2103 #ifdef CONFIG_MAC80211_MESH
2104 if (meshhdrlen > 0) {
2105 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2106 nh_pos += meshhdrlen;
2107 h_pos += meshhdrlen;
2111 if (ieee80211_is_data_qos(fc)) {
2112 __le16 *qos_control;
2114 qos_control = (__le16*) skb_push(skb, 2);
2115 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2117 * Maybe we could actually set some fields here, for now just
2118 * initialise to zero to indicate no special operation.
2122 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2127 dev->stats.tx_packets++;
2128 dev->stats.tx_bytes += skb->len;
2130 /* Update skb pointers to various headers since this modified frame
2131 * is going to go through Linux networking code that may potentially
2132 * need things like pointer to IP header. */
2133 skb_set_mac_header(skb, 0);
2134 skb_set_network_header(skb, nh_pos);
2135 skb_set_transport_header(skb, h_pos);
2137 info = IEEE80211_SKB_CB(skb);
2138 memset(info, 0, sizeof(*info));
2140 dev->trans_start = jiffies;
2142 info->flags = info_flags;
2143 info->ack_frame_id = info_id;
2145 ieee80211_xmit(sdata, skb, band);
2148 return NETDEV_TX_OK;
2154 return NETDEV_TX_OK;
2159 * ieee80211_clear_tx_pending may not be called in a context where
2160 * it is possible that it packets could come in again.
2162 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2164 struct sk_buff *skb;
2167 for (i = 0; i < local->hw.queues; i++) {
2168 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2169 ieee80211_free_txskb(&local->hw, skb);
2174 * Returns false if the frame couldn't be transmitted but was queued instead,
2175 * which in this case means re-queued -- take as an indication to stop sending
2176 * more pending frames.
2178 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2179 struct sk_buff *skb)
2181 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2182 struct ieee80211_sub_if_data *sdata;
2183 struct sta_info *sta;
2184 struct ieee80211_hdr *hdr;
2186 struct ieee80211_chanctx_conf *chanctx_conf;
2188 sdata = vif_to_sdata(info->control.vif);
2190 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2191 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2192 if (unlikely(!chanctx_conf)) {
2196 result = ieee80211_tx(sdata, skb, true,
2197 chanctx_conf->def.chan->band);
2199 struct sk_buff_head skbs;
2201 __skb_queue_head_init(&skbs);
2202 __skb_queue_tail(&skbs, skb);
2204 hdr = (struct ieee80211_hdr *)skb->data;
2205 sta = sta_info_get(sdata, hdr->addr1);
2207 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2214 * Transmit all pending packets. Called from tasklet.
2216 void ieee80211_tx_pending(unsigned long data)
2218 struct ieee80211_local *local = (struct ieee80211_local *)data;
2219 unsigned long flags;
2225 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2226 for (i = 0; i < local->hw.queues; i++) {
2228 * If queue is stopped by something other than due to pending
2229 * frames, or we have no pending frames, proceed to next queue.
2231 if (local->queue_stop_reasons[i] ||
2232 skb_queue_empty(&local->pending[i]))
2235 while (!skb_queue_empty(&local->pending[i])) {
2236 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2237 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2239 if (WARN_ON(!info->control.vif)) {
2240 ieee80211_free_txskb(&local->hw, skb);
2244 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2247 txok = ieee80211_tx_pending_skb(local, skb);
2248 spin_lock_irqsave(&local->queue_stop_reason_lock,
2254 if (skb_queue_empty(&local->pending[i]))
2255 ieee80211_propagate_queue_wake(local, i);
2257 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2262 /* functions for drivers to get certain frames */
2264 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2265 struct ps_data *ps, struct sk_buff *skb)
2269 int i, have_bits = 0, n1, n2;
2271 /* Generate bitmap for TIM only if there are any STAs in power save
2273 if (atomic_read(&ps->num_sta_ps) > 0)
2274 /* in the hope that this is faster than
2275 * checking byte-for-byte */
2276 have_bits = !bitmap_empty((unsigned long*)ps->tim,
2277 IEEE80211_MAX_AID+1);
2279 if (ps->dtim_count == 0)
2280 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2284 tim = pos = (u8 *) skb_put(skb, 6);
2285 *pos++ = WLAN_EID_TIM;
2287 *pos++ = ps->dtim_count;
2288 *pos++ = sdata->vif.bss_conf.dtim_period;
2290 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2293 ps->dtim_bc_mc = aid0 == 1;
2296 /* Find largest even number N1 so that bits numbered 1 through
2297 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2298 * (N2 + 1) x 8 through 2007 are 0. */
2300 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2307 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2314 /* Bitmap control */
2316 /* Part Virt Bitmap */
2317 skb_put(skb, n2 - n1);
2318 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2320 tim[1] = n2 - n1 + 4;
2322 *pos++ = aid0; /* Bitmap control */
2323 *pos++ = 0; /* Part Virt Bitmap */
2327 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2328 struct ps_data *ps, struct sk_buff *skb)
2330 struct ieee80211_local *local = sdata->local;
2333 * Not very nice, but we want to allow the driver to call
2334 * ieee80211_beacon_get() as a response to the set_tim()
2335 * callback. That, however, is already invoked under the
2336 * sta_lock to guarantee consistent and race-free update
2337 * of the tim bitmap in mac80211 and the driver.
2339 if (local->tim_in_locked_section) {
2340 __ieee80211_beacon_add_tim(sdata, ps, skb);
2342 unsigned long flags;
2344 spin_lock_irqsave(&local->tim_lock, flags);
2345 __ieee80211_beacon_add_tim(sdata, ps, skb);
2346 spin_unlock_irqrestore(&local->tim_lock, flags);
2352 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2353 struct ieee80211_vif *vif,
2354 u16 *tim_offset, u16 *tim_length)
2356 struct ieee80211_local *local = hw_to_local(hw);
2357 struct sk_buff *skb = NULL;
2358 struct ieee80211_tx_info *info;
2359 struct ieee80211_sub_if_data *sdata = NULL;
2360 enum ieee80211_band band;
2361 struct ieee80211_tx_rate_control txrc;
2362 struct ieee80211_chanctx_conf *chanctx_conf;
2366 sdata = vif_to_sdata(vif);
2367 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2369 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2377 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2378 struct ieee80211_if_ap *ap = &sdata->u.ap;
2379 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2383 * headroom, head length,
2384 * tail length and maximum TIM length
2386 skb = dev_alloc_skb(local->tx_headroom +
2388 beacon->tail_len + 256);
2392 skb_reserve(skb, local->tx_headroom);
2393 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2396 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2399 *tim_offset = beacon->head_len;
2401 *tim_length = skb->len - beacon->head_len;
2404 memcpy(skb_put(skb, beacon->tail_len),
2405 beacon->tail, beacon->tail_len);
2408 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2409 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2410 struct ieee80211_hdr *hdr;
2411 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2416 skb = skb_copy(presp, GFP_ATOMIC);
2420 hdr = (struct ieee80211_hdr *) skb->data;
2421 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2422 IEEE80211_STYPE_BEACON);
2423 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2424 struct ieee80211_mgmt *mgmt;
2425 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2427 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
2428 sizeof(mgmt->u.beacon);
2430 #ifdef CONFIG_MAC80211_MESH
2431 if (!sdata->u.mesh.mesh_id_len)
2435 if (ifmsh->sync_ops)
2436 ifmsh->sync_ops->adjust_tbtt(
2439 skb = dev_alloc_skb(local->tx_headroom +
2442 2 + 8 + /* supported rates */
2443 2 + 3 + /* DS params */
2444 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
2445 2 + sizeof(struct ieee80211_ht_cap) +
2446 2 + sizeof(struct ieee80211_ht_operation) +
2447 2 + sdata->u.mesh.mesh_id_len +
2448 2 + sizeof(struct ieee80211_meshconf_ie) +
2449 sdata->u.mesh.ie_len);
2453 skb_reserve(skb, local->hw.extra_tx_headroom);
2454 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
2455 memset(mgmt, 0, hdr_len);
2456 mgmt->frame_control =
2457 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2458 eth_broadcast_addr(mgmt->da);
2459 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2460 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2461 mgmt->u.beacon.beacon_int =
2462 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2463 mgmt->u.beacon.capab_info |= cpu_to_le16(
2464 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
2466 pos = skb_put(skb, 2);
2467 *pos++ = WLAN_EID_SSID;
2470 band = chanctx_conf->def.chan->band;
2472 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
2473 mesh_add_ds_params_ie(skb, sdata) ||
2474 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
2475 mesh_add_rsn_ie(skb, sdata) ||
2476 mesh_add_ht_cap_ie(skb, sdata) ||
2477 mesh_add_ht_oper_ie(skb, sdata) ||
2478 mesh_add_meshid_ie(skb, sdata) ||
2479 mesh_add_meshconf_ie(skb, sdata) ||
2480 mesh_add_vendor_ies(skb, sdata)) {
2481 pr_err("o11s: couldn't add ies!\n");
2489 band = chanctx_conf->def.chan->band;
2491 info = IEEE80211_SKB_CB(skb);
2493 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2494 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2497 memset(&txrc, 0, sizeof(txrc));
2499 txrc.sband = local->hw.wiphy->bands[band];
2500 txrc.bss_conf = &sdata->vif.bss_conf;
2502 txrc.reported_rate.idx = -1;
2503 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2504 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2505 txrc.max_rate_idx = -1;
2507 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2508 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band],
2509 sizeof(txrc.rate_idx_mcs_mask));
2511 rate_control_get_rate(sdata, NULL, &txrc);
2513 info->control.vif = vif;
2515 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2516 IEEE80211_TX_CTL_ASSIGN_SEQ |
2517 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2522 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2524 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2525 struct ieee80211_vif *vif)
2527 struct ieee80211_if_ap *ap = NULL;
2528 struct sk_buff *skb = NULL;
2529 struct probe_resp *presp = NULL;
2530 struct ieee80211_hdr *hdr;
2531 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2533 if (sdata->vif.type != NL80211_IFTYPE_AP)
2539 presp = rcu_dereference(ap->probe_resp);
2543 skb = dev_alloc_skb(presp->len);
2547 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2549 hdr = (struct ieee80211_hdr *) skb->data;
2550 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2556 EXPORT_SYMBOL(ieee80211_proberesp_get);
2558 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2559 struct ieee80211_vif *vif)
2561 struct ieee80211_sub_if_data *sdata;
2562 struct ieee80211_if_managed *ifmgd;
2563 struct ieee80211_pspoll *pspoll;
2564 struct ieee80211_local *local;
2565 struct sk_buff *skb;
2567 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2570 sdata = vif_to_sdata(vif);
2571 ifmgd = &sdata->u.mgd;
2572 local = sdata->local;
2574 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2578 skb_reserve(skb, local->hw.extra_tx_headroom);
2580 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2581 memset(pspoll, 0, sizeof(*pspoll));
2582 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2583 IEEE80211_STYPE_PSPOLL);
2584 pspoll->aid = cpu_to_le16(ifmgd->aid);
2586 /* aid in PS-Poll has its two MSBs each set to 1 */
2587 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2589 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2590 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2594 EXPORT_SYMBOL(ieee80211_pspoll_get);
2596 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2597 struct ieee80211_vif *vif)
2599 struct ieee80211_hdr_3addr *nullfunc;
2600 struct ieee80211_sub_if_data *sdata;
2601 struct ieee80211_if_managed *ifmgd;
2602 struct ieee80211_local *local;
2603 struct sk_buff *skb;
2605 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2608 sdata = vif_to_sdata(vif);
2609 ifmgd = &sdata->u.mgd;
2610 local = sdata->local;
2612 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2616 skb_reserve(skb, local->hw.extra_tx_headroom);
2618 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2620 memset(nullfunc, 0, sizeof(*nullfunc));
2621 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2622 IEEE80211_STYPE_NULLFUNC |
2623 IEEE80211_FCTL_TODS);
2624 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2625 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2626 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2630 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2632 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2633 struct ieee80211_vif *vif,
2634 const u8 *ssid, size_t ssid_len,
2637 struct ieee80211_sub_if_data *sdata;
2638 struct ieee80211_local *local;
2639 struct ieee80211_hdr_3addr *hdr;
2640 struct sk_buff *skb;
2644 sdata = vif_to_sdata(vif);
2645 local = sdata->local;
2646 ie_ssid_len = 2 + ssid_len;
2648 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2649 ie_ssid_len + tailroom);
2653 skb_reserve(skb, local->hw.extra_tx_headroom);
2655 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2656 memset(hdr, 0, sizeof(*hdr));
2657 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2658 IEEE80211_STYPE_PROBE_REQ);
2659 eth_broadcast_addr(hdr->addr1);
2660 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2661 eth_broadcast_addr(hdr->addr3);
2663 pos = skb_put(skb, ie_ssid_len);
2664 *pos++ = WLAN_EID_SSID;
2667 memcpy(pos, ssid, ssid_len);
2672 EXPORT_SYMBOL(ieee80211_probereq_get);
2674 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2675 const void *frame, size_t frame_len,
2676 const struct ieee80211_tx_info *frame_txctl,
2677 struct ieee80211_rts *rts)
2679 const struct ieee80211_hdr *hdr = frame;
2681 rts->frame_control =
2682 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2683 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2685 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2686 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2688 EXPORT_SYMBOL(ieee80211_rts_get);
2690 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2691 const void *frame, size_t frame_len,
2692 const struct ieee80211_tx_info *frame_txctl,
2693 struct ieee80211_cts *cts)
2695 const struct ieee80211_hdr *hdr = frame;
2697 cts->frame_control =
2698 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2699 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2700 frame_len, frame_txctl);
2701 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2703 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2706 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2707 struct ieee80211_vif *vif)
2709 struct ieee80211_local *local = hw_to_local(hw);
2710 struct sk_buff *skb = NULL;
2711 struct ieee80211_tx_data tx;
2712 struct ieee80211_sub_if_data *sdata;
2714 struct ieee80211_tx_info *info;
2715 struct ieee80211_chanctx_conf *chanctx_conf;
2717 sdata = vif_to_sdata(vif);
2720 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2725 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2726 struct beacon_data *beacon =
2727 rcu_dereference(sdata->u.ap.beacon);
2729 if (!beacon || !beacon->head)
2732 ps = &sdata->u.ap.ps;
2737 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2738 goto out; /* send buffered bc/mc only after DTIM beacon */
2741 skb = skb_dequeue(&ps->bc_buf);
2744 local->total_ps_buffered--;
2746 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2747 struct ieee80211_hdr *hdr =
2748 (struct ieee80211_hdr *) skb->data;
2749 /* more buffered multicast/broadcast frames ==> set
2750 * MoreData flag in IEEE 802.11 header to inform PS
2752 hdr->frame_control |=
2753 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2756 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2758 dev_kfree_skb_any(skb);
2761 info = IEEE80211_SKB_CB(skb);
2763 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2764 info->band = chanctx_conf->def.chan->band;
2766 if (invoke_tx_handlers(&tx))
2773 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2775 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2776 struct sk_buff *skb, int tid,
2777 enum ieee80211_band band)
2779 int ac = ieee802_1d_to_ac[tid & 7];
2781 skb_set_mac_header(skb, 0);
2782 skb_set_network_header(skb, 0);
2783 skb_set_transport_header(skb, 0);
2785 skb_set_queue_mapping(skb, ac);
2786 skb->priority = tid;
2789 * The other path calling ieee80211_xmit is from the tasklet,
2790 * and while we can handle concurrent transmissions locking
2791 * requirements are that we do not come into tx with bhs on.
2794 ieee80211_xmit(sdata, skb, band);