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 (tx->rate.flags & IEEE80211_TX_RC_MCS)
55 if (WARN_ON_ONCE(tx->rate.idx < 0))
58 sband = local->hw.wiphy->bands[info->band];
59 txrate = &sband->bitrates[tx->rate.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_MAX_QUEUE_MAP,
237 IEEE80211_QUEUE_STOP_REASON_PS);
238 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
239 ieee80211_queue_work(&local->hw,
240 &local->dynamic_ps_disable_work);
243 /* Don't restart the timer if we're not disassociated */
244 if (!ifmgd->associated)
247 mod_timer(&local->dynamic_ps_timer, jiffies +
248 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
253 static ieee80211_tx_result debug_noinline
254 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
257 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
258 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
261 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
264 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
265 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
266 !ieee80211_is_probe_req(hdr->frame_control) &&
267 !ieee80211_is_nullfunc(hdr->frame_control))
269 * When software scanning only nullfunc frames (to notify
270 * the sleep state to the AP) and probe requests (for the
271 * active scan) are allowed, all other frames should not be
272 * sent and we should not get here, but if we do
273 * nonetheless, drop them to avoid sending them
274 * off-channel. See the link below and
275 * ieee80211_start_scan() for more.
277 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
281 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
284 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
287 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
291 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
293 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
294 if (unlikely(!assoc &&
295 ieee80211_is_data(hdr->frame_control))) {
296 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
297 sdata_info(tx->sdata,
298 "dropped data frame to not associated station %pM\n",
301 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
304 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
305 ieee80211_is_data(hdr->frame_control) &&
306 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
308 * No associated STAs - no need to send multicast
317 /* This function is called whenever the AP is about to exceed the maximum limit
318 * of buffered frames for power saving STAs. This situation should not really
319 * happen often during normal operation, so dropping the oldest buffered packet
320 * from each queue should be OK to make some room for new frames. */
321 static void purge_old_ps_buffers(struct ieee80211_local *local)
323 int total = 0, purged = 0;
325 struct ieee80211_sub_if_data *sdata;
326 struct sta_info *sta;
328 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
331 if (sdata->vif.type == NL80211_IFTYPE_AP)
332 ps = &sdata->u.ap.ps;
333 else if (ieee80211_vif_is_mesh(&sdata->vif))
334 ps = &sdata->u.mesh.ps;
338 skb = skb_dequeue(&ps->bc_buf);
343 total += skb_queue_len(&ps->bc_buf);
347 * Drop one frame from each station from the lowest-priority
348 * AC that has frames at all.
350 list_for_each_entry_rcu(sta, &local->sta_list, list) {
353 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
354 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
355 total += skb_queue_len(&sta->ps_tx_buf[ac]);
358 ieee80211_free_txskb(&local->hw, skb);
364 local->total_ps_buffered = total;
365 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
368 static ieee80211_tx_result
369 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
371 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
372 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
376 * broadcast/multicast frame
378 * If any of the associated/peer stations is in power save mode,
379 * the frame is buffered to be sent after DTIM beacon frame.
380 * This is done either by the hardware or us.
383 /* powersaving STAs currently only in AP/VLAN/mesh mode */
384 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
385 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
389 ps = &tx->sdata->bss->ps;
390 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
391 ps = &tx->sdata->u.mesh.ps;
397 /* no buffering for ordered frames */
398 if (ieee80211_has_order(hdr->frame_control))
401 if (ieee80211_is_probe_req(hdr->frame_control))
404 /* no stations in PS mode */
405 if (!atomic_read(&ps->num_sta_ps))
408 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
409 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
410 info->hw_queue = tx->sdata->vif.cab_queue;
412 /* device releases frame after DTIM beacon */
413 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
416 /* buffered in mac80211 */
417 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
418 purge_old_ps_buffers(tx->local);
420 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
422 "BC TX buffer full - dropping the oldest frame\n");
423 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
425 tx->local->total_ps_buffered++;
427 skb_queue_tail(&ps->bc_buf, tx->skb);
432 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
435 if (!ieee80211_is_mgmt(fc))
438 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
441 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
448 static ieee80211_tx_result
449 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
451 struct sta_info *sta = tx->sta;
452 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
453 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
454 struct ieee80211_local *local = tx->local;
459 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
460 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
461 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
462 int ac = skb_get_queue_mapping(tx->skb);
464 /* only deauth, disassoc and action are bufferable MMPDUs */
465 if (ieee80211_is_mgmt(hdr->frame_control) &&
466 !ieee80211_is_deauth(hdr->frame_control) &&
467 !ieee80211_is_disassoc(hdr->frame_control) &&
468 !ieee80211_is_action(hdr->frame_control)) {
469 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
473 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
474 sta->sta.addr, sta->sta.aid, ac);
475 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
476 purge_old_ps_buffers(tx->local);
478 /* sync with ieee80211_sta_ps_deliver_wakeup */
479 spin_lock(&sta->ps_lock);
481 * STA woke up the meantime and all the frames on ps_tx_buf have
482 * been queued to pending queue. No reordering can happen, go
483 * ahead and Tx the packet.
485 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
486 !test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
487 spin_unlock(&sta->ps_lock);
491 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
492 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
494 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
496 ieee80211_free_txskb(&local->hw, old);
498 tx->local->total_ps_buffered++;
500 info->control.jiffies = jiffies;
501 info->control.vif = &tx->sdata->vif;
502 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
503 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
504 spin_unlock(&sta->ps_lock);
506 if (!timer_pending(&local->sta_cleanup))
507 mod_timer(&local->sta_cleanup,
508 round_jiffies(jiffies +
509 STA_INFO_CLEANUP_INTERVAL));
512 * We queued up some frames, so the TIM bit might
513 * need to be set, recalculate it.
515 sta_info_recalc_tim(sta);
518 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
520 "STA %pM in PS mode, but polling/in SP -> send frame\n",
527 static ieee80211_tx_result debug_noinline
528 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
530 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
532 if (tx->flags & IEEE80211_TX_UNICAST)
533 return ieee80211_tx_h_unicast_ps_buf(tx);
535 return ieee80211_tx_h_multicast_ps_buf(tx);
538 static ieee80211_tx_result debug_noinline
539 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
541 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
543 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
544 tx->sdata->control_port_no_encrypt))
545 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
550 static ieee80211_tx_result debug_noinline
551 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
553 struct ieee80211_key *key;
554 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
555 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
557 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
559 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
561 else if (ieee80211_is_mgmt(hdr->frame_control) &&
562 is_multicast_ether_addr(hdr->addr1) &&
563 ieee80211_is_robust_mgmt_frame(hdr) &&
564 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
566 else if (is_multicast_ether_addr(hdr->addr1) &&
567 (key = rcu_dereference(tx->sdata->default_multicast_key)))
569 else if (!is_multicast_ether_addr(hdr->addr1) &&
570 (key = rcu_dereference(tx->sdata->default_unicast_key)))
572 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
574 else if (!tx->sdata->drop_unencrypted)
576 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
578 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
579 !(ieee80211_is_action(hdr->frame_control) &&
580 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
582 else if (ieee80211_is_mgmt(hdr->frame_control) &&
583 !ieee80211_is_robust_mgmt_frame(hdr))
586 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
591 bool skip_hw = false;
593 tx->key->tx_rx_count++;
594 /* TODO: add threshold stuff again */
596 switch (tx->key->conf.cipher) {
597 case WLAN_CIPHER_SUITE_WEP40:
598 case WLAN_CIPHER_SUITE_WEP104:
599 case WLAN_CIPHER_SUITE_TKIP:
600 if (!ieee80211_is_data_present(hdr->frame_control))
603 case WLAN_CIPHER_SUITE_CCMP:
604 if (!ieee80211_is_data_present(hdr->frame_control) &&
605 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
609 skip_hw = (tx->key->conf.flags &
610 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
611 ieee80211_is_mgmt(hdr->frame_control);
613 case WLAN_CIPHER_SUITE_AES_CMAC:
614 if (!ieee80211_is_mgmt(hdr->frame_control))
619 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
620 !ieee80211_is_deauth(hdr->frame_control)))
623 if (!skip_hw && tx->key &&
624 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
625 info->control.hw_key = &tx->key->conf;
631 static ieee80211_tx_result debug_noinline
632 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
634 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
635 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
636 struct ieee80211_supported_band *sband;
638 struct ieee80211_tx_rate_control txrc;
639 struct ieee80211_sta_rates *ratetbl = NULL;
642 memset(&txrc, 0, sizeof(txrc));
644 sband = tx->local->hw.wiphy->bands[info->band];
646 len = min_t(u32, tx->skb->len + FCS_LEN,
647 tx->local->hw.wiphy->frag_threshold);
649 /* set up the tx rate control struct we give the RC algo */
650 txrc.hw = &tx->local->hw;
652 txrc.bss_conf = &tx->sdata->vif.bss_conf;
654 txrc.reported_rate.idx = -1;
655 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
656 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
657 txrc.max_rate_idx = -1;
659 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
661 if (tx->sdata->rc_has_mcs_mask[info->band])
662 txrc.rate_idx_mcs_mask =
663 tx->sdata->rc_rateidx_mcs_mask[info->band];
665 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
666 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
667 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
669 /* set up RTS protection if desired */
670 if (len > tx->local->hw.wiphy->rts_threshold) {
674 info->control.use_rts = txrc.rts;
675 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
678 * Use short preamble if the BSS can handle it, but not for
679 * management frames unless we know the receiver can handle
680 * that -- the management frame might be to a station that
681 * just wants a probe response.
683 if (tx->sdata->vif.bss_conf.use_short_preamble &&
684 (ieee80211_is_data(hdr->frame_control) ||
685 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
686 txrc.short_preamble = true;
688 info->control.short_preamble = txrc.short_preamble;
691 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
694 * Lets not bother rate control if we're associated and cannot
695 * talk to the sta. This should not happen.
697 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
698 !rate_usable_index_exists(sband, &tx->sta->sta),
699 "%s: Dropped data frame as no usable bitrate found while "
700 "scanning and associated. Target station: "
701 "%pM on %d GHz band\n",
702 tx->sdata->name, hdr->addr1,
707 * If we're associated with the sta at this point we know we can at
708 * least send the frame at the lowest bit rate.
710 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
712 if (tx->sta && !info->control.skip_table)
713 ratetbl = rcu_dereference(tx->sta->sta.rates);
715 if (unlikely(info->control.rates[0].idx < 0)) {
717 struct ieee80211_tx_rate rate = {
718 .idx = ratetbl->rate[0].idx,
719 .flags = ratetbl->rate[0].flags,
720 .count = ratetbl->rate[0].count
723 if (ratetbl->rate[0].idx < 0)
731 tx->rate = info->control.rates[0];
734 if (txrc.reported_rate.idx < 0) {
735 txrc.reported_rate = tx->rate;
736 if (tx->sta && ieee80211_is_data(hdr->frame_control))
737 tx->sta->last_tx_rate = txrc.reported_rate;
739 tx->sta->last_tx_rate = txrc.reported_rate;
744 if (unlikely(!info->control.rates[0].count))
745 info->control.rates[0].count = 1;
747 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
748 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
749 info->control.rates[0].count = 1;
754 static ieee80211_tx_result debug_noinline
755 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
757 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
758 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
764 * Packet injection may want to control the sequence
765 * number, if we have no matching interface then we
766 * neither assign one ourselves nor ask the driver to.
768 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
771 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
774 if (ieee80211_hdrlen(hdr->frame_control) < 24)
777 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
781 * Anything but QoS data that has a sequence number field
782 * (is long enough) gets a sequence number from the global
785 if (!ieee80211_is_data_qos(hdr->frame_control)) {
786 /* driver should assign sequence number */
787 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
788 /* for pure STA mode without beacons, we can do it */
789 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
790 tx->sdata->sequence_number += 0x10;
795 * This should be true for injected/management frames only, for
796 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
797 * above since they are not QoS-data frames.
802 /* include per-STA, per-TID sequence counter */
804 qc = ieee80211_get_qos_ctl(hdr);
805 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
806 seq = &tx->sta->tid_seq[tid];
808 hdr->seq_ctrl = cpu_to_le16(*seq);
810 /* Increase the sequence number. */
811 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
816 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
817 struct sk_buff *skb, int hdrlen,
820 struct ieee80211_local *local = tx->local;
821 struct ieee80211_tx_info *info;
823 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
824 int pos = hdrlen + per_fragm;
825 int rem = skb->len - hdrlen - per_fragm;
827 if (WARN_ON(rem < 0))
830 /* first fragment was already added to queue by caller */
833 int fraglen = per_fragm;
838 tmp = dev_alloc_skb(local->tx_headroom +
840 IEEE80211_ENCRYPT_HEADROOM +
841 IEEE80211_ENCRYPT_TAILROOM);
845 __skb_queue_tail(&tx->skbs, tmp);
847 skb_reserve(tmp, local->tx_headroom +
848 IEEE80211_ENCRYPT_HEADROOM);
849 /* copy control information */
850 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
852 info = IEEE80211_SKB_CB(tmp);
853 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
854 IEEE80211_TX_CTL_FIRST_FRAGMENT);
857 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
859 skb_copy_queue_mapping(tmp, skb);
860 tmp->priority = skb->priority;
863 /* copy header and data */
864 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
865 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
870 /* adjust first fragment's length */
871 skb_trim(skb, hdrlen + per_fragm);
875 static ieee80211_tx_result debug_noinline
876 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
878 struct sk_buff *skb = tx->skb;
879 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
880 struct ieee80211_hdr *hdr = (void *)skb->data;
881 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
885 /* no matter what happens, tx->skb moves to tx->skbs */
886 __skb_queue_tail(&tx->skbs, skb);
889 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
892 if (tx->local->ops->set_frag_threshold)
896 * Warn when submitting a fragmented A-MPDU frame and drop it.
897 * This scenario is handled in ieee80211_tx_prepare but extra
898 * caution taken here as fragmented ampdu may cause Tx stop.
900 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
903 hdrlen = ieee80211_hdrlen(hdr->frame_control);
905 /* internal error, why isn't DONTFRAG set? */
906 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
910 * Now fragment the frame. This will allocate all the fragments and
911 * chain them (using skb as the first fragment) to skb->next.
912 * During transmission, we will remove the successfully transmitted
913 * fragments from this list. When the low-level driver rejects one
914 * of the fragments then we will simply pretend to accept the skb
915 * but store it away as pending.
917 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
920 /* update duration/seq/flags of fragments */
923 skb_queue_walk(&tx->skbs, skb) {
924 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
926 hdr = (void *)skb->data;
927 info = IEEE80211_SKB_CB(skb);
929 if (!skb_queue_is_last(&tx->skbs, skb)) {
930 hdr->frame_control |= morefrags;
932 * No multi-rate retries for fragmented frames, that
933 * would completely throw off the NAV at other STAs.
935 info->control.rates[1].idx = -1;
936 info->control.rates[2].idx = -1;
937 info->control.rates[3].idx = -1;
938 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
939 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
941 hdr->frame_control &= ~morefrags;
943 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
950 static ieee80211_tx_result debug_noinline
951 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
959 skb_queue_walk(&tx->skbs, skb) {
960 ac = skb_get_queue_mapping(skb);
961 tx->sta->tx_fragments++;
962 tx->sta->tx_bytes[ac] += skb->len;
965 tx->sta->tx_packets[ac]++;
970 static ieee80211_tx_result debug_noinline
971 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
976 switch (tx->key->conf.cipher) {
977 case WLAN_CIPHER_SUITE_WEP40:
978 case WLAN_CIPHER_SUITE_WEP104:
979 return ieee80211_crypto_wep_encrypt(tx);
980 case WLAN_CIPHER_SUITE_TKIP:
981 return ieee80211_crypto_tkip_encrypt(tx);
982 case WLAN_CIPHER_SUITE_CCMP:
983 return ieee80211_crypto_ccmp_encrypt(tx);
984 case WLAN_CIPHER_SUITE_AES_CMAC:
985 return ieee80211_crypto_aes_cmac_encrypt(tx);
987 return ieee80211_crypto_hw_encrypt(tx);
993 static ieee80211_tx_result debug_noinline
994 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
997 struct ieee80211_hdr *hdr;
1001 skb_queue_walk(&tx->skbs, skb) {
1002 hdr = (void *) skb->data;
1003 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1004 break; /* must not overwrite AID */
1005 if (!skb_queue_is_last(&tx->skbs, skb)) {
1006 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1007 next_len = next->len;
1010 group_addr = is_multicast_ether_addr(hdr->addr1);
1013 ieee80211_duration(tx, skb, group_addr, next_len);
1019 /* actual transmit path */
1021 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1022 struct sk_buff *skb,
1023 struct ieee80211_tx_info *info,
1024 struct tid_ampdu_tx *tid_tx,
1027 bool queued = false;
1028 bool reset_agg_timer = false;
1029 struct sk_buff *purge_skb = NULL;
1031 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1032 info->flags |= IEEE80211_TX_CTL_AMPDU;
1033 reset_agg_timer = true;
1034 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1036 * nothing -- this aggregation session is being started
1037 * but that might still fail with the driver
1040 spin_lock(&tx->sta->lock);
1042 * Need to re-check now, because we may get here
1044 * 1) in the window during which the setup is actually
1045 * already done, but not marked yet because not all
1046 * packets are spliced over to the driver pending
1047 * queue yet -- if this happened we acquire the lock
1048 * either before or after the splice happens, but
1049 * need to recheck which of these cases happened.
1051 * 2) during session teardown, if the OPERATIONAL bit
1052 * was cleared due to the teardown but the pointer
1053 * hasn't been assigned NULL yet (or we loaded it
1054 * before it was assigned) -- in this case it may
1055 * now be NULL which means we should just let the
1056 * packet pass through because splicing the frames
1057 * back is already done.
1059 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1062 /* do nothing, let packet pass through */
1063 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1064 info->flags |= IEEE80211_TX_CTL_AMPDU;
1065 reset_agg_timer = true;
1068 info->control.vif = &tx->sdata->vif;
1069 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1070 __skb_queue_tail(&tid_tx->pending, skb);
1071 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1072 purge_skb = __skb_dequeue(&tid_tx->pending);
1074 spin_unlock(&tx->sta->lock);
1077 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1080 /* reset session timer */
1081 if (reset_agg_timer && tid_tx->timeout)
1082 tid_tx->last_tx = jiffies;
1090 static ieee80211_tx_result
1091 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1092 struct ieee80211_tx_data *tx,
1093 struct sk_buff *skb)
1095 struct ieee80211_local *local = sdata->local;
1096 struct ieee80211_hdr *hdr;
1097 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1101 memset(tx, 0, sizeof(*tx));
1105 __skb_queue_head_init(&tx->skbs);
1108 * If this flag is set to true anywhere, and we get here,
1109 * we are doing the needed processing, so remove the flag
1112 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1114 hdr = (struct ieee80211_hdr *) skb->data;
1116 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1117 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1118 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1120 } else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
1121 IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1122 tx->sdata->control_port_protocol == tx->skb->protocol) {
1123 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1126 tx->sta = sta_info_get(sdata, hdr->addr1);
1128 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1129 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1130 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1131 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1132 struct tid_ampdu_tx *tid_tx;
1134 qc = ieee80211_get_qos_ctl(hdr);
1135 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1137 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1141 queued = ieee80211_tx_prep_agg(tx, skb, info,
1144 if (unlikely(queued))
1149 if (is_multicast_ether_addr(hdr->addr1)) {
1150 tx->flags &= ~IEEE80211_TX_UNICAST;
1151 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1153 tx->flags |= IEEE80211_TX_UNICAST;
1155 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1156 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1157 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1158 info->flags & IEEE80211_TX_CTL_AMPDU)
1159 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1163 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1164 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1165 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1167 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1172 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1173 struct ieee80211_vif *vif,
1174 struct ieee80211_sta *sta,
1175 struct sk_buff_head *skbs,
1178 struct ieee80211_tx_control control;
1179 struct sk_buff *skb, *tmp;
1180 unsigned long flags;
1182 skb_queue_walk_safe(skbs, skb, tmp) {
1183 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1184 int q = info->hw_queue;
1186 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1187 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1188 __skb_unlink(skb, skbs);
1189 ieee80211_free_txskb(&local->hw, skb);
1194 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1195 if (local->queue_stop_reasons[q] ||
1196 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1197 if (unlikely(info->flags &
1198 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1199 if (local->queue_stop_reasons[q] &
1200 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1202 * Drop off-channel frames if queues
1203 * are stopped for any reason other
1204 * than off-channel operation. Never
1207 spin_unlock_irqrestore(
1208 &local->queue_stop_reason_lock,
1210 ieee80211_purge_tx_queue(&local->hw,
1217 * Since queue is stopped, queue up frames for
1218 * later transmission from the tx-pending
1219 * tasklet when the queue is woken again.
1222 skb_queue_splice_init(skbs,
1223 &local->pending[q]);
1225 skb_queue_splice_tail_init(skbs,
1226 &local->pending[q]);
1228 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1233 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1235 info->control.vif = vif;
1238 __skb_unlink(skb, skbs);
1239 drv_tx(local, &control, skb);
1246 * Returns false if the frame couldn't be transmitted but was queued instead.
1248 static bool __ieee80211_tx(struct ieee80211_local *local,
1249 struct sk_buff_head *skbs, int led_len,
1250 struct sta_info *sta, bool txpending)
1252 struct ieee80211_tx_info *info;
1253 struct ieee80211_sub_if_data *sdata;
1254 struct ieee80211_vif *vif;
1255 struct ieee80211_sta *pubsta;
1256 struct sk_buff *skb;
1260 if (WARN_ON(skb_queue_empty(skbs)))
1263 skb = skb_peek(skbs);
1264 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1265 info = IEEE80211_SKB_CB(skb);
1266 sdata = vif_to_sdata(info->control.vif);
1267 if (sta && !sta->uploaded)
1275 switch (sdata->vif.type) {
1276 case NL80211_IFTYPE_MONITOR:
1277 sdata = rcu_dereference(local->monitor_sdata);
1281 vif->hw_queue[skb_get_queue_mapping(skb)];
1282 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1288 case NL80211_IFTYPE_AP_VLAN:
1289 sdata = container_of(sdata->bss,
1290 struct ieee80211_sub_if_data, u.ap);
1297 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1300 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1301 ieee80211_led_tx(local, 1);
1303 WARN_ON_ONCE(!skb_queue_empty(skbs));
1309 * Invoke TX handlers, return 0 on success and non-zero if the
1310 * frame was dropped or queued.
1312 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1314 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1315 ieee80211_tx_result res = TX_DROP;
1317 #define CALL_TXH(txh) \
1320 if (res != TX_CONTINUE) \
1324 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1325 CALL_TXH(ieee80211_tx_h_check_assoc);
1326 CALL_TXH(ieee80211_tx_h_ps_buf);
1327 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1328 CALL_TXH(ieee80211_tx_h_select_key);
1329 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1330 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1332 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1333 __skb_queue_tail(&tx->skbs, tx->skb);
1338 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1339 CALL_TXH(ieee80211_tx_h_sequence);
1340 CALL_TXH(ieee80211_tx_h_fragment);
1341 /* handlers after fragment must be aware of tx info fragmentation! */
1342 CALL_TXH(ieee80211_tx_h_stats);
1343 CALL_TXH(ieee80211_tx_h_encrypt);
1344 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1345 CALL_TXH(ieee80211_tx_h_calculate_duration);
1349 if (unlikely(res == TX_DROP)) {
1350 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1352 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1354 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1356 } else if (unlikely(res == TX_QUEUED)) {
1357 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1365 * Returns false if the frame couldn't be transmitted but was queued instead.
1367 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1368 struct sk_buff *skb, bool txpending,
1369 enum ieee80211_band band)
1371 struct ieee80211_local *local = sdata->local;
1372 struct ieee80211_tx_data tx;
1373 ieee80211_tx_result res_prepare;
1374 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1378 if (unlikely(skb->len < 10)) {
1383 /* initialises tx */
1385 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1387 if (unlikely(res_prepare == TX_DROP)) {
1388 ieee80211_free_txskb(&local->hw, skb);
1390 } else if (unlikely(res_prepare == TX_QUEUED)) {
1396 /* set up hw_queue value early */
1397 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1398 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1400 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1402 if (!invoke_tx_handlers(&tx))
1403 result = __ieee80211_tx(local, &tx.skbs, led_len,
1409 /* device xmit handlers */
1411 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1412 struct sk_buff *skb,
1413 int head_need, bool may_encrypt)
1415 struct ieee80211_local *local = sdata->local;
1418 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1419 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1420 tail_need -= skb_tailroom(skb);
1421 tail_need = max_t(int, tail_need, 0);
1424 if (skb_cloned(skb))
1425 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1426 else if (head_need || tail_need)
1427 I802_DEBUG_INC(local->tx_expand_skb_head);
1431 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1432 wiphy_debug(local->hw.wiphy,
1433 "failed to reallocate TX buffer\n");
1440 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1441 enum ieee80211_band band)
1443 struct ieee80211_local *local = sdata->local;
1444 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1445 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1449 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1451 headroom = local->tx_headroom;
1453 headroom += IEEE80211_ENCRYPT_HEADROOM;
1454 headroom -= skb_headroom(skb);
1455 headroom = max_t(int, 0, headroom);
1457 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1458 ieee80211_free_txskb(&local->hw, skb);
1462 hdr = (struct ieee80211_hdr *) skb->data;
1463 info->control.vif = &sdata->vif;
1465 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1466 if (ieee80211_is_data(hdr->frame_control) &&
1467 is_unicast_ether_addr(hdr->addr1)) {
1468 if (mesh_nexthop_resolve(sdata, skb))
1469 return; /* skb queued: don't free */
1471 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1475 ieee80211_set_qos_hdr(sdata, skb);
1476 ieee80211_tx(sdata, skb, false, band);
1479 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1481 struct ieee80211_radiotap_iterator iterator;
1482 struct ieee80211_radiotap_header *rthdr =
1483 (struct ieee80211_radiotap_header *) skb->data;
1484 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1485 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1489 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1490 IEEE80211_TX_CTL_DONTFRAG;
1493 * for every radiotap entry that is present
1494 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1495 * entries present, or -EINVAL on error)
1499 ret = ieee80211_radiotap_iterator_next(&iterator);
1504 /* see if this argument is something we can use */
1505 switch (iterator.this_arg_index) {
1507 * You must take care when dereferencing iterator.this_arg
1508 * for multibyte types... the pointer is not aligned. Use
1509 * get_unaligned((type *)iterator.this_arg) to dereference
1510 * iterator.this_arg for type "type" safely on all arches.
1512 case IEEE80211_RADIOTAP_FLAGS:
1513 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1515 * this indicates that the skb we have been
1516 * handed has the 32-bit FCS CRC at the end...
1517 * we should react to that by snipping it off
1518 * because it will be recomputed and added
1521 if (skb->len < (iterator._max_length + FCS_LEN))
1524 skb_trim(skb, skb->len - FCS_LEN);
1526 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1527 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1528 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1529 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1532 case IEEE80211_RADIOTAP_TX_FLAGS:
1533 txflags = get_unaligned_le16(iterator.this_arg);
1534 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1535 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1539 * Please update the file
1540 * Documentation/networking/mac80211-injection.txt
1541 * when parsing new fields here.
1549 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1553 * remove the radiotap header
1554 * iterator->_max_length was sanity-checked against
1555 * skb->len by iterator init
1557 skb_pull(skb, iterator._max_length);
1562 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1563 struct net_device *dev)
1565 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1566 struct ieee80211_chanctx_conf *chanctx_conf;
1567 struct ieee80211_channel *chan;
1568 struct ieee80211_radiotap_header *prthdr =
1569 (struct ieee80211_radiotap_header *)skb->data;
1570 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1571 struct ieee80211_hdr *hdr;
1572 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1576 /* check for not even having the fixed radiotap header part */
1577 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1578 goto fail; /* too short to be possibly valid */
1580 /* is it a header version we can trust to find length from? */
1581 if (unlikely(prthdr->it_version))
1582 goto fail; /* only version 0 is supported */
1584 /* then there must be a radiotap header with a length we can use */
1585 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1587 /* does the skb contain enough to deliver on the alleged length? */
1588 if (unlikely(skb->len < len_rthdr))
1589 goto fail; /* skb too short for claimed rt header extent */
1592 * fix up the pointers accounting for the radiotap
1593 * header still being in there. We are being given
1594 * a precooked IEEE80211 header so no need for
1597 skb_set_mac_header(skb, len_rthdr);
1599 * these are just fixed to the end of the rt area since we
1600 * don't have any better information and at this point, nobody cares
1602 skb_set_network_header(skb, len_rthdr);
1603 skb_set_transport_header(skb, len_rthdr);
1605 if (skb->len < len_rthdr + 2)
1608 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1609 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1611 if (skb->len < len_rthdr + hdrlen)
1615 * Initialize skb->protocol if the injected frame is a data frame
1616 * carrying a rfc1042 header
1618 if (ieee80211_is_data(hdr->frame_control) &&
1619 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1620 u8 *payload = (u8 *)hdr + hdrlen;
1622 if (ether_addr_equal(payload, rfc1042_header))
1623 skb->protocol = cpu_to_be16((payload[6] << 8) |
1627 memset(info, 0, sizeof(*info));
1629 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1630 IEEE80211_TX_CTL_INJECTED;
1632 /* process and remove the injection radiotap header */
1633 if (!ieee80211_parse_tx_radiotap(skb))
1639 * We process outgoing injected frames that have a local address
1640 * we handle as though they are non-injected frames.
1641 * This code here isn't entirely correct, the local MAC address
1642 * isn't always enough to find the interface to use; for proper
1643 * VLAN/WDS support we will need a different mechanism (which
1644 * likely isn't going to be monitor interfaces).
1646 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1648 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1649 if (!ieee80211_sdata_running(tmp_sdata))
1651 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1652 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1653 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1655 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1661 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1662 if (!chanctx_conf) {
1663 tmp_sdata = rcu_dereference(local->monitor_sdata);
1666 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1670 chan = chanctx_conf->def.chan;
1671 else if (!local->use_chanctx)
1672 chan = local->_oper_chandef.chan;
1677 * Frame injection is not allowed if beaconing is not allowed
1678 * or if we need radar detection. Beaconing is usually not allowed when
1679 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1680 * Passive scan is also used in world regulatory domains where
1681 * your country is not known and as such it should be treated as
1682 * NO TX unless the channel is explicitly allowed in which case
1683 * your current regulatory domain would not have the passive scan
1686 * Since AP mode uses monitor interfaces to inject/TX management
1687 * frames we can make AP mode the exception to this rule once it
1688 * supports radar detection as its implementation can deal with
1689 * radar detection by itself. We can do that later by adding a
1690 * monitor flag interfaces used for AP support.
1692 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1693 IEEE80211_CHAN_PASSIVE_SCAN)))
1696 ieee80211_xmit(sdata, skb, chan->band);
1699 return NETDEV_TX_OK;
1705 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1709 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1710 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1711 * @skb: packet to be sent
1712 * @dev: incoming interface
1714 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1715 * not be freed, and caller is responsible for either retrying later or freeing
1718 * This function takes in an Ethernet header and encapsulates it with suitable
1719 * IEEE 802.11 header based on which interface the packet is coming in. The
1720 * encapsulated packet will then be passed to master interface, wlan#.11, for
1721 * transmission (through low-level driver).
1723 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1724 struct net_device *dev)
1726 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1727 struct ieee80211_local *local = sdata->local;
1728 struct ieee80211_tx_info *info;
1730 u16 ethertype, hdrlen, meshhdrlen = 0;
1732 struct ieee80211_hdr hdr;
1733 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1734 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1735 const u8 *encaps_data;
1736 int encaps_len, skip_header_bytes;
1738 struct sta_info *sta = NULL;
1739 bool wme_sta = false, authorized = false, tdls_auth = false;
1740 bool tdls_direct = false;
1744 struct ieee80211_chanctx_conf *chanctx_conf;
1745 struct ieee80211_sub_if_data *ap_sdata;
1746 enum ieee80211_band band;
1748 if (unlikely(skb->len < ETH_HLEN))
1751 /* convert Ethernet header to proper 802.11 header (based on
1752 * operation mode) */
1753 ethertype = (skb->data[12] << 8) | skb->data[13];
1754 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1758 switch (sdata->vif.type) {
1759 case NL80211_IFTYPE_AP_VLAN:
1760 sta = rcu_dereference(sdata->u.vlan.sta);
1762 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1764 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1765 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1766 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1767 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1769 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1770 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1772 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1774 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1777 band = chanctx_conf->def.chan->band;
1781 case NL80211_IFTYPE_AP:
1782 if (sdata->vif.type == NL80211_IFTYPE_AP)
1783 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1786 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1788 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1789 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1790 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1792 band = chanctx_conf->def.chan->band;
1794 case NL80211_IFTYPE_WDS:
1795 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1797 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1798 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1799 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1800 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1803 * This is the exception! WDS style interfaces are prohibited
1804 * when channel contexts are in used so this must be valid
1806 band = local->hw.conf.chandef.chan->band;
1808 #ifdef CONFIG_MAC80211_MESH
1809 case NL80211_IFTYPE_MESH_POINT:
1810 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1811 /* Do not send frames with mesh_ttl == 0 */
1812 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1816 if (!is_multicast_ether_addr(skb->data)) {
1817 struct sta_info *next_hop;
1818 bool mpp_lookup = true;
1820 mpath = mesh_path_lookup(sdata, skb->data);
1823 next_hop = rcu_dereference(mpath->next_hop);
1825 !(mpath->flags & (MESH_PATH_ACTIVE |
1826 MESH_PATH_RESOLVING)))
1831 mppath = mpp_path_lookup(sdata, skb->data);
1833 if (mppath && mpath)
1834 mesh_path_del(mpath->sdata, mpath->dst);
1838 * Use address extension if it is a packet from
1839 * another interface or if we know the destination
1840 * is being proxied by a portal (i.e. portal address
1841 * differs from proxied address)
1843 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1844 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1845 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1846 skb->data, skb->data + ETH_ALEN);
1847 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1850 /* DS -> MBSS (802.11-2012 13.11.3.3).
1851 * For unicast with unknown forwarding information,
1852 * destination might be in the MBSS or if that fails
1853 * forwarded to another mesh gate. In either case
1854 * resolution will be handled in ieee80211_xmit(), so
1855 * leave the original DA. This also works for mcast */
1856 const u8 *mesh_da = skb->data;
1859 mesh_da = mppath->mpp;
1861 mesh_da = mpath->dst;
1863 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1864 mesh_da, sdata->vif.addr);
1865 if (is_multicast_ether_addr(mesh_da))
1866 /* DA TA mSA AE:SA */
1867 meshhdrlen = ieee80211_new_mesh_header(
1869 skb->data + ETH_ALEN, NULL);
1871 /* RA TA mDA mSA AE:DA SA */
1872 meshhdrlen = ieee80211_new_mesh_header(
1873 sdata, &mesh_hdr, skb->data,
1874 skb->data + ETH_ALEN);
1877 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1880 band = chanctx_conf->def.chan->band;
1883 case NL80211_IFTYPE_STATION:
1884 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1885 bool tdls_peer = false;
1887 sta = sta_info_get(sdata, skb->data);
1889 authorized = test_sta_flag(sta,
1890 WLAN_STA_AUTHORIZED);
1891 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1892 tdls_peer = test_sta_flag(sta,
1893 WLAN_STA_TDLS_PEER);
1894 tdls_auth = test_sta_flag(sta,
1895 WLAN_STA_TDLS_PEER_AUTH);
1899 * If the TDLS link is enabled, send everything
1900 * directly. Otherwise, allow TDLS setup frames
1901 * to be transmitted indirectly.
1903 tdls_direct = tdls_peer && (tdls_auth ||
1904 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1905 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1909 /* link during setup - throw out frames to peer */
1914 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1915 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1916 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1918 } else if (sdata->u.mgd.use_4addr &&
1919 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1920 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1921 IEEE80211_FCTL_TODS);
1923 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1924 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1925 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1926 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1929 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1931 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1932 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1933 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1936 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1939 band = chanctx_conf->def.chan->band;
1941 case NL80211_IFTYPE_ADHOC:
1943 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1944 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1945 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1947 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1950 band = chanctx_conf->def.chan->band;
1957 * There's no need to try to look up the destination
1958 * if it is a multicast address (which can only happen
1961 multicast = is_multicast_ether_addr(hdr.addr1);
1963 sta = sta_info_get(sdata, hdr.addr1);
1965 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1966 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1970 /* For mesh, the use of the QoS header is mandatory */
1971 if (ieee80211_vif_is_mesh(&sdata->vif))
1974 /* receiver and we are QoS enabled, use a QoS type frame */
1975 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1976 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1981 * Drop unicast frames to unauthorised stations unless they are
1982 * EAPOL frames from the local station.
1984 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1985 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1986 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1987 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1988 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1989 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1990 dev->name, hdr.addr1);
1993 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1998 if (unlikely(!multicast && skb->sk &&
1999 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2000 struct sk_buff *orig_skb = skb;
2002 skb = skb_clone(skb, GFP_ATOMIC);
2004 unsigned long flags;
2007 spin_lock_irqsave(&local->ack_status_lock, flags);
2008 id = idr_alloc(&local->ack_status_frames, orig_skb,
2009 1, 0x10000, GFP_ATOMIC);
2010 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2014 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2015 } else if (skb_shared(skb)) {
2016 kfree_skb(orig_skb);
2022 /* couldn't clone -- lose tx status ... */
2028 * If the skb is shared we need to obtain our own copy.
2030 if (skb_shared(skb)) {
2031 struct sk_buff *tmp_skb = skb;
2033 /* can't happen -- skb is a clone if info_id != 0 */
2036 skb = skb_clone(skb, GFP_ATOMIC);
2043 hdr.frame_control = fc;
2044 hdr.duration_id = 0;
2047 skip_header_bytes = ETH_HLEN;
2048 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2049 encaps_data = bridge_tunnel_header;
2050 encaps_len = sizeof(bridge_tunnel_header);
2051 skip_header_bytes -= 2;
2052 } else if (ethertype >= ETH_P_802_3_MIN) {
2053 encaps_data = rfc1042_header;
2054 encaps_len = sizeof(rfc1042_header);
2055 skip_header_bytes -= 2;
2061 nh_pos = skb_network_header(skb) - skb->data;
2062 h_pos = skb_transport_header(skb) - skb->data;
2064 skb_pull(skb, skip_header_bytes);
2065 nh_pos -= skip_header_bytes;
2066 h_pos -= skip_header_bytes;
2068 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2071 * So we need to modify the skb header and hence need a copy of
2072 * that. The head_need variable above doesn't, so far, include
2073 * the needed header space that we don't need right away. If we
2074 * can, then we don't reallocate right now but only after the
2075 * frame arrives at the master device (if it does...)
2077 * If we cannot, however, then we will reallocate to include all
2078 * the ever needed space. Also, if we need to reallocate it anyway,
2079 * make it big enough for everything we may ever need.
2082 if (head_need > 0 || skb_cloned(skb)) {
2083 head_need += IEEE80211_ENCRYPT_HEADROOM;
2084 head_need += local->tx_headroom;
2085 head_need = max_t(int, 0, head_need);
2086 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2087 ieee80211_free_txskb(&local->hw, skb);
2094 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2095 nh_pos += encaps_len;
2096 h_pos += encaps_len;
2099 #ifdef CONFIG_MAC80211_MESH
2100 if (meshhdrlen > 0) {
2101 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2102 nh_pos += meshhdrlen;
2103 h_pos += meshhdrlen;
2107 if (ieee80211_is_data_qos(fc)) {
2108 __le16 *qos_control;
2110 qos_control = (__le16*) skb_push(skb, 2);
2111 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2113 * Maybe we could actually set some fields here, for now just
2114 * initialise to zero to indicate no special operation.
2118 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2123 dev->stats.tx_packets++;
2124 dev->stats.tx_bytes += skb->len;
2126 /* Update skb pointers to various headers since this modified frame
2127 * is going to go through Linux networking code that may potentially
2128 * need things like pointer to IP header. */
2129 skb_set_mac_header(skb, 0);
2130 skb_set_network_header(skb, nh_pos);
2131 skb_set_transport_header(skb, h_pos);
2133 info = IEEE80211_SKB_CB(skb);
2134 memset(info, 0, sizeof(*info));
2136 dev->trans_start = jiffies;
2138 info->flags = info_flags;
2139 info->ack_frame_id = info_id;
2141 ieee80211_xmit(sdata, skb, band);
2144 return NETDEV_TX_OK;
2150 return NETDEV_TX_OK;
2155 * ieee80211_clear_tx_pending may not be called in a context where
2156 * it is possible that it packets could come in again.
2158 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2160 struct sk_buff *skb;
2163 for (i = 0; i < local->hw.queues; i++) {
2164 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2165 ieee80211_free_txskb(&local->hw, skb);
2170 * Returns false if the frame couldn't be transmitted but was queued instead,
2171 * which in this case means re-queued -- take as an indication to stop sending
2172 * more pending frames.
2174 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2175 struct sk_buff *skb)
2177 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2178 struct ieee80211_sub_if_data *sdata;
2179 struct sta_info *sta;
2180 struct ieee80211_hdr *hdr;
2182 struct ieee80211_chanctx_conf *chanctx_conf;
2184 sdata = vif_to_sdata(info->control.vif);
2186 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2187 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2188 if (unlikely(!chanctx_conf)) {
2192 result = ieee80211_tx(sdata, skb, true,
2193 chanctx_conf->def.chan->band);
2195 struct sk_buff_head skbs;
2197 __skb_queue_head_init(&skbs);
2198 __skb_queue_tail(&skbs, skb);
2200 hdr = (struct ieee80211_hdr *)skb->data;
2201 sta = sta_info_get(sdata, hdr->addr1);
2203 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2210 * Transmit all pending packets. Called from tasklet.
2212 void ieee80211_tx_pending(unsigned long data)
2214 struct ieee80211_local *local = (struct ieee80211_local *)data;
2215 unsigned long flags;
2221 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2222 for (i = 0; i < local->hw.queues; i++) {
2224 * If queue is stopped by something other than due to pending
2225 * frames, or we have no pending frames, proceed to next queue.
2227 if (local->queue_stop_reasons[i] ||
2228 skb_queue_empty(&local->pending[i]))
2231 while (!skb_queue_empty(&local->pending[i])) {
2232 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2233 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2235 if (WARN_ON(!info->control.vif)) {
2236 ieee80211_free_txskb(&local->hw, skb);
2240 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2243 txok = ieee80211_tx_pending_skb(local, skb);
2244 spin_lock_irqsave(&local->queue_stop_reason_lock,
2250 if (skb_queue_empty(&local->pending[i]))
2251 ieee80211_propagate_queue_wake(local, i);
2253 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2258 /* functions for drivers to get certain frames */
2260 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2261 struct ps_data *ps, struct sk_buff *skb)
2265 int i, have_bits = 0, n1, n2;
2267 /* Generate bitmap for TIM only if there are any STAs in power save
2269 if (atomic_read(&ps->num_sta_ps) > 0)
2270 /* in the hope that this is faster than
2271 * checking byte-for-byte */
2272 have_bits = !bitmap_empty((unsigned long*)ps->tim,
2273 IEEE80211_MAX_AID+1);
2275 if (ps->dtim_count == 0)
2276 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2280 tim = pos = (u8 *) skb_put(skb, 6);
2281 *pos++ = WLAN_EID_TIM;
2283 *pos++ = ps->dtim_count;
2284 *pos++ = sdata->vif.bss_conf.dtim_period;
2286 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2289 ps->dtim_bc_mc = aid0 == 1;
2292 /* Find largest even number N1 so that bits numbered 1 through
2293 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2294 * (N2 + 1) x 8 through 2007 are 0. */
2296 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2303 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2310 /* Bitmap control */
2312 /* Part Virt Bitmap */
2313 skb_put(skb, n2 - n1);
2314 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2316 tim[1] = n2 - n1 + 4;
2318 *pos++ = aid0; /* Bitmap control */
2319 *pos++ = 0; /* Part Virt Bitmap */
2323 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2324 struct ps_data *ps, struct sk_buff *skb)
2326 struct ieee80211_local *local = sdata->local;
2329 * Not very nice, but we want to allow the driver to call
2330 * ieee80211_beacon_get() as a response to the set_tim()
2331 * callback. That, however, is already invoked under the
2332 * sta_lock to guarantee consistent and race-free update
2333 * of the tim bitmap in mac80211 and the driver.
2335 if (local->tim_in_locked_section) {
2336 __ieee80211_beacon_add_tim(sdata, ps, skb);
2338 spin_lock_bh(&local->tim_lock);
2339 __ieee80211_beacon_add_tim(sdata, ps, skb);
2340 spin_unlock_bh(&local->tim_lock);
2346 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2347 struct ieee80211_vif *vif,
2348 u16 *tim_offset, u16 *tim_length)
2350 struct ieee80211_local *local = hw_to_local(hw);
2351 struct sk_buff *skb = NULL;
2352 struct ieee80211_tx_info *info;
2353 struct ieee80211_sub_if_data *sdata = NULL;
2354 enum ieee80211_band band;
2355 struct ieee80211_tx_rate_control txrc;
2356 struct ieee80211_chanctx_conf *chanctx_conf;
2360 sdata = vif_to_sdata(vif);
2361 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2363 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2371 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2372 struct ieee80211_if_ap *ap = &sdata->u.ap;
2373 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2377 * headroom, head length,
2378 * tail length and maximum TIM length
2380 skb = dev_alloc_skb(local->tx_headroom +
2382 beacon->tail_len + 256);
2386 skb_reserve(skb, local->tx_headroom);
2387 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2390 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2393 *tim_offset = beacon->head_len;
2395 *tim_length = skb->len - beacon->head_len;
2398 memcpy(skb_put(skb, beacon->tail_len),
2399 beacon->tail, beacon->tail_len);
2402 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2403 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2404 struct ieee80211_hdr *hdr;
2405 struct beacon_data *presp = rcu_dereference(ifibss->presp);
2410 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
2413 skb_reserve(skb, local->tx_headroom);
2414 memcpy(skb_put(skb, presp->head_len), presp->head,
2417 hdr = (struct ieee80211_hdr *) skb->data;
2418 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2419 IEEE80211_STYPE_BEACON);
2420 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2421 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2422 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
2427 if (ifmsh->sync_ops)
2428 ifmsh->sync_ops->adjust_tbtt(
2431 skb = dev_alloc_skb(local->tx_headroom +
2437 skb_reserve(skb, local->tx_headroom);
2438 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2439 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2440 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
2446 band = chanctx_conf->def.chan->band;
2448 info = IEEE80211_SKB_CB(skb);
2450 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2451 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2454 memset(&txrc, 0, sizeof(txrc));
2456 txrc.sband = local->hw.wiphy->bands[band];
2457 txrc.bss_conf = &sdata->vif.bss_conf;
2459 txrc.reported_rate.idx = -1;
2460 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2461 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2462 txrc.max_rate_idx = -1;
2464 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2466 rate_control_get_rate(sdata, NULL, &txrc);
2468 info->control.vif = vif;
2470 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2471 IEEE80211_TX_CTL_ASSIGN_SEQ |
2472 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2477 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2479 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2480 struct ieee80211_vif *vif)
2482 struct ieee80211_if_ap *ap = NULL;
2483 struct sk_buff *skb = NULL;
2484 struct probe_resp *presp = NULL;
2485 struct ieee80211_hdr *hdr;
2486 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2488 if (sdata->vif.type != NL80211_IFTYPE_AP)
2494 presp = rcu_dereference(ap->probe_resp);
2498 skb = dev_alloc_skb(presp->len);
2502 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2504 hdr = (struct ieee80211_hdr *) skb->data;
2505 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2511 EXPORT_SYMBOL(ieee80211_proberesp_get);
2513 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2514 struct ieee80211_vif *vif)
2516 struct ieee80211_sub_if_data *sdata;
2517 struct ieee80211_if_managed *ifmgd;
2518 struct ieee80211_pspoll *pspoll;
2519 struct ieee80211_local *local;
2520 struct sk_buff *skb;
2522 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2525 sdata = vif_to_sdata(vif);
2526 ifmgd = &sdata->u.mgd;
2527 local = sdata->local;
2529 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2533 skb_reserve(skb, local->hw.extra_tx_headroom);
2535 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2536 memset(pspoll, 0, sizeof(*pspoll));
2537 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2538 IEEE80211_STYPE_PSPOLL);
2539 pspoll->aid = cpu_to_le16(ifmgd->aid);
2541 /* aid in PS-Poll has its two MSBs each set to 1 */
2542 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2544 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2545 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2549 EXPORT_SYMBOL(ieee80211_pspoll_get);
2551 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2552 struct ieee80211_vif *vif)
2554 struct ieee80211_hdr_3addr *nullfunc;
2555 struct ieee80211_sub_if_data *sdata;
2556 struct ieee80211_if_managed *ifmgd;
2557 struct ieee80211_local *local;
2558 struct sk_buff *skb;
2560 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2563 sdata = vif_to_sdata(vif);
2564 ifmgd = &sdata->u.mgd;
2565 local = sdata->local;
2567 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2571 skb_reserve(skb, local->hw.extra_tx_headroom);
2573 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2575 memset(nullfunc, 0, sizeof(*nullfunc));
2576 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2577 IEEE80211_STYPE_NULLFUNC |
2578 IEEE80211_FCTL_TODS);
2579 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2580 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2581 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2585 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2587 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2588 struct ieee80211_vif *vif,
2589 const u8 *ssid, size_t ssid_len,
2592 struct ieee80211_sub_if_data *sdata;
2593 struct ieee80211_local *local;
2594 struct ieee80211_hdr_3addr *hdr;
2595 struct sk_buff *skb;
2599 sdata = vif_to_sdata(vif);
2600 local = sdata->local;
2601 ie_ssid_len = 2 + ssid_len;
2603 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2604 ie_ssid_len + tailroom);
2608 skb_reserve(skb, local->hw.extra_tx_headroom);
2610 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2611 memset(hdr, 0, sizeof(*hdr));
2612 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2613 IEEE80211_STYPE_PROBE_REQ);
2614 eth_broadcast_addr(hdr->addr1);
2615 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2616 eth_broadcast_addr(hdr->addr3);
2618 pos = skb_put(skb, ie_ssid_len);
2619 *pos++ = WLAN_EID_SSID;
2622 memcpy(pos, ssid, ssid_len);
2627 EXPORT_SYMBOL(ieee80211_probereq_get);
2629 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2630 const void *frame, size_t frame_len,
2631 const struct ieee80211_tx_info *frame_txctl,
2632 struct ieee80211_rts *rts)
2634 const struct ieee80211_hdr *hdr = frame;
2636 rts->frame_control =
2637 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2638 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2640 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2641 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2643 EXPORT_SYMBOL(ieee80211_rts_get);
2645 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2646 const void *frame, size_t frame_len,
2647 const struct ieee80211_tx_info *frame_txctl,
2648 struct ieee80211_cts *cts)
2650 const struct ieee80211_hdr *hdr = frame;
2652 cts->frame_control =
2653 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2654 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2655 frame_len, frame_txctl);
2656 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2658 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2661 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2662 struct ieee80211_vif *vif)
2664 struct ieee80211_local *local = hw_to_local(hw);
2665 struct sk_buff *skb = NULL;
2666 struct ieee80211_tx_data tx;
2667 struct ieee80211_sub_if_data *sdata;
2669 struct ieee80211_tx_info *info;
2670 struct ieee80211_chanctx_conf *chanctx_conf;
2672 sdata = vif_to_sdata(vif);
2675 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2680 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2681 struct beacon_data *beacon =
2682 rcu_dereference(sdata->u.ap.beacon);
2684 if (!beacon || !beacon->head)
2687 ps = &sdata->u.ap.ps;
2688 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2689 ps = &sdata->u.mesh.ps;
2694 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2695 goto out; /* send buffered bc/mc only after DTIM beacon */
2698 skb = skb_dequeue(&ps->bc_buf);
2701 local->total_ps_buffered--;
2703 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2704 struct ieee80211_hdr *hdr =
2705 (struct ieee80211_hdr *) skb->data;
2706 /* more buffered multicast/broadcast frames ==> set
2707 * MoreData flag in IEEE 802.11 header to inform PS
2709 hdr->frame_control |=
2710 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2713 if (sdata->vif.type == NL80211_IFTYPE_AP)
2714 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
2715 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2717 dev_kfree_skb_any(skb);
2720 info = IEEE80211_SKB_CB(skb);
2722 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2723 info->band = chanctx_conf->def.chan->band;
2725 if (invoke_tx_handlers(&tx))
2732 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2734 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2735 struct sk_buff *skb, int tid,
2736 enum ieee80211_band band)
2738 int ac = ieee802_1d_to_ac[tid & 7];
2740 skb_set_mac_header(skb, 0);
2741 skb_set_network_header(skb, 0);
2742 skb_set_transport_header(skb, 0);
2744 skb_set_queue_mapping(skb, ac);
2745 skb->priority = tid;
2747 skb->dev = sdata->dev;
2750 * The other path calling ieee80211_xmit is from the tasklet,
2751 * and while we can handle concurrent transmissions locking
2752 * requirements are that we do not come into tx with bhs on.
2755 ieee80211_xmit(sdata, skb, band);