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 /* no stations in PS mode */
402 if (!atomic_read(&ps->num_sta_ps))
405 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
406 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
407 info->hw_queue = tx->sdata->vif.cab_queue;
409 /* device releases frame after DTIM beacon */
410 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
413 /* buffered in mac80211 */
414 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
415 purge_old_ps_buffers(tx->local);
417 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
419 "BC TX buffer full - dropping the oldest frame\n");
420 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
422 tx->local->total_ps_buffered++;
424 skb_queue_tail(&ps->bc_buf, tx->skb);
429 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
432 if (!ieee80211_is_mgmt(fc))
435 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
438 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
445 static ieee80211_tx_result
446 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
448 struct sta_info *sta = tx->sta;
449 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
450 struct ieee80211_local *local = tx->local;
455 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
456 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
457 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
458 int ac = skb_get_queue_mapping(tx->skb);
460 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
461 sta->sta.addr, sta->sta.aid, ac);
462 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
463 purge_old_ps_buffers(tx->local);
465 /* sync with ieee80211_sta_ps_deliver_wakeup */
466 spin_lock(&sta->ps_lock);
468 * STA woke up the meantime and all the frames on ps_tx_buf have
469 * been queued to pending queue. No reordering can happen, go
470 * ahead and Tx the packet.
472 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
473 !test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
474 spin_unlock(&sta->ps_lock);
478 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
479 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
481 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
483 ieee80211_free_txskb(&local->hw, old);
485 tx->local->total_ps_buffered++;
487 info->control.jiffies = jiffies;
488 info->control.vif = &tx->sdata->vif;
489 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
490 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
491 spin_unlock(&sta->ps_lock);
493 if (!timer_pending(&local->sta_cleanup))
494 mod_timer(&local->sta_cleanup,
495 round_jiffies(jiffies +
496 STA_INFO_CLEANUP_INTERVAL));
499 * We queued up some frames, so the TIM bit might
500 * need to be set, recalculate it.
502 sta_info_recalc_tim(sta);
505 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
507 "STA %pM in PS mode, but polling/in SP -> send frame\n",
514 static ieee80211_tx_result debug_noinline
515 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
517 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
518 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
520 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
523 /* only deauth, disassoc and action are bufferable MMPDUs */
524 if (ieee80211_is_mgmt(hdr->frame_control) &&
525 !ieee80211_is_deauth(hdr->frame_control) &&
526 !ieee80211_is_disassoc(hdr->frame_control) &&
527 !ieee80211_is_action(hdr->frame_control)) {
528 if (tx->flags & IEEE80211_TX_UNICAST)
529 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
533 if (tx->flags & IEEE80211_TX_UNICAST)
534 return ieee80211_tx_h_unicast_ps_buf(tx);
536 return ieee80211_tx_h_multicast_ps_buf(tx);
539 static ieee80211_tx_result debug_noinline
540 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
542 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
544 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
545 tx->sdata->control_port_no_encrypt))
546 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
551 static ieee80211_tx_result debug_noinline
552 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
554 struct ieee80211_key *key;
555 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
556 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
558 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
560 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
562 else if (ieee80211_is_mgmt(hdr->frame_control) &&
563 is_multicast_ether_addr(hdr->addr1) &&
564 ieee80211_is_robust_mgmt_frame(hdr) &&
565 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
567 else if (is_multicast_ether_addr(hdr->addr1) &&
568 (key = rcu_dereference(tx->sdata->default_multicast_key)))
570 else if (!is_multicast_ether_addr(hdr->addr1) &&
571 (key = rcu_dereference(tx->sdata->default_unicast_key)))
573 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
575 else if (!tx->sdata->drop_unencrypted)
577 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
579 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
580 !(ieee80211_is_action(hdr->frame_control) &&
581 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
583 else if (ieee80211_is_mgmt(hdr->frame_control) &&
584 !ieee80211_is_robust_mgmt_frame(hdr))
587 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
592 bool skip_hw = false;
594 tx->key->tx_rx_count++;
595 /* TODO: add threshold stuff again */
597 switch (tx->key->conf.cipher) {
598 case WLAN_CIPHER_SUITE_WEP40:
599 case WLAN_CIPHER_SUITE_WEP104:
600 case WLAN_CIPHER_SUITE_TKIP:
601 if (!ieee80211_is_data_present(hdr->frame_control))
604 case WLAN_CIPHER_SUITE_CCMP:
605 if (!ieee80211_is_data_present(hdr->frame_control) &&
606 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
610 skip_hw = (tx->key->conf.flags &
611 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
612 ieee80211_is_mgmt(hdr->frame_control);
614 case WLAN_CIPHER_SUITE_AES_CMAC:
615 if (!ieee80211_is_mgmt(hdr->frame_control))
620 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
621 !ieee80211_is_deauth(hdr->frame_control)))
624 if (!skip_hw && tx->key &&
625 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
626 info->control.hw_key = &tx->key->conf;
632 static ieee80211_tx_result debug_noinline
633 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
635 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
636 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
637 struct ieee80211_supported_band *sband;
639 struct ieee80211_tx_rate_control txrc;
640 struct ieee80211_sta_rates *ratetbl = NULL;
643 memset(&txrc, 0, sizeof(txrc));
645 sband = tx->local->hw.wiphy->bands[info->band];
647 len = min_t(u32, tx->skb->len + FCS_LEN,
648 tx->local->hw.wiphy->frag_threshold);
650 /* set up the tx rate control struct we give the RC algo */
651 txrc.hw = &tx->local->hw;
653 txrc.bss_conf = &tx->sdata->vif.bss_conf;
655 txrc.reported_rate.idx = -1;
656 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
657 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
658 txrc.max_rate_idx = -1;
660 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
662 if (tx->sdata->rc_has_mcs_mask[info->band])
663 txrc.rate_idx_mcs_mask =
664 tx->sdata->rc_rateidx_mcs_mask[info->band];
666 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
667 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
668 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
670 /* set up RTS protection if desired */
671 if (len > tx->local->hw.wiphy->rts_threshold) {
675 info->control.use_rts = txrc.rts;
676 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
679 * Use short preamble if the BSS can handle it, but not for
680 * management frames unless we know the receiver can handle
681 * that -- the management frame might be to a station that
682 * just wants a probe response.
684 if (tx->sdata->vif.bss_conf.use_short_preamble &&
685 (ieee80211_is_data(hdr->frame_control) ||
686 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
687 txrc.short_preamble = true;
689 info->control.short_preamble = txrc.short_preamble;
692 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
695 * Lets not bother rate control if we're associated and cannot
696 * talk to the sta. This should not happen.
698 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
699 !rate_usable_index_exists(sband, &tx->sta->sta),
700 "%s: Dropped data frame as no usable bitrate found while "
701 "scanning and associated. Target station: "
702 "%pM on %d GHz band\n",
703 tx->sdata->name, hdr->addr1,
708 * If we're associated with the sta at this point we know we can at
709 * least send the frame at the lowest bit rate.
711 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
713 if (tx->sta && !info->control.skip_table)
714 ratetbl = rcu_dereference(tx->sta->sta.rates);
716 if (unlikely(info->control.rates[0].idx < 0)) {
718 struct ieee80211_tx_rate rate = {
719 .idx = ratetbl->rate[0].idx,
720 .flags = ratetbl->rate[0].flags,
721 .count = ratetbl->rate[0].count
724 if (ratetbl->rate[0].idx < 0)
732 tx->rate = info->control.rates[0];
735 if (txrc.reported_rate.idx < 0) {
736 txrc.reported_rate = tx->rate;
737 if (tx->sta && ieee80211_is_data(hdr->frame_control))
738 tx->sta->last_tx_rate = txrc.reported_rate;
740 tx->sta->last_tx_rate = txrc.reported_rate;
745 if (unlikely(!info->control.rates[0].count))
746 info->control.rates[0].count = 1;
748 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
749 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
750 info->control.rates[0].count = 1;
755 static ieee80211_tx_result debug_noinline
756 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
758 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
759 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
765 * Packet injection may want to control the sequence
766 * number, if we have no matching interface then we
767 * neither assign one ourselves nor ask the driver to.
769 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
772 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
775 if (ieee80211_hdrlen(hdr->frame_control) < 24)
778 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
782 * Anything but QoS data that has a sequence number field
783 * (is long enough) gets a sequence number from the global
786 if (!ieee80211_is_data_qos(hdr->frame_control)) {
787 /* driver should assign sequence number */
788 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
789 /* for pure STA mode without beacons, we can do it */
790 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
791 tx->sdata->sequence_number += 0x10;
796 * This should be true for injected/management frames only, for
797 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
798 * above since they are not QoS-data frames.
803 /* include per-STA, per-TID sequence counter */
805 qc = ieee80211_get_qos_ctl(hdr);
806 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
807 seq = &tx->sta->tid_seq[tid];
809 hdr->seq_ctrl = cpu_to_le16(*seq);
811 /* Increase the sequence number. */
812 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
817 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
818 struct sk_buff *skb, int hdrlen,
821 struct ieee80211_local *local = tx->local;
822 struct ieee80211_tx_info *info;
824 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
825 int pos = hdrlen + per_fragm;
826 int rem = skb->len - hdrlen - per_fragm;
828 if (WARN_ON(rem < 0))
831 /* first fragment was already added to queue by caller */
834 int fraglen = per_fragm;
839 tmp = dev_alloc_skb(local->tx_headroom +
841 IEEE80211_ENCRYPT_HEADROOM +
842 IEEE80211_ENCRYPT_TAILROOM);
846 __skb_queue_tail(&tx->skbs, tmp);
848 skb_reserve(tmp, local->tx_headroom +
849 IEEE80211_ENCRYPT_HEADROOM);
850 /* copy control information */
851 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
853 info = IEEE80211_SKB_CB(tmp);
854 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
855 IEEE80211_TX_CTL_FIRST_FRAGMENT);
858 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
860 skb_copy_queue_mapping(tmp, skb);
861 tmp->priority = skb->priority;
864 /* copy header and data */
865 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
866 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
871 /* adjust first fragment's length */
872 skb_trim(skb, hdrlen + per_fragm);
876 static ieee80211_tx_result debug_noinline
877 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
879 struct sk_buff *skb = tx->skb;
880 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
881 struct ieee80211_hdr *hdr = (void *)skb->data;
882 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
886 /* no matter what happens, tx->skb moves to tx->skbs */
887 __skb_queue_tail(&tx->skbs, skb);
890 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
893 if (tx->local->ops->set_frag_threshold)
897 * Warn when submitting a fragmented A-MPDU frame and drop it.
898 * This scenario is handled in ieee80211_tx_prepare but extra
899 * caution taken here as fragmented ampdu may cause Tx stop.
901 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
904 hdrlen = ieee80211_hdrlen(hdr->frame_control);
906 /* internal error, why isn't DONTFRAG set? */
907 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
911 * Now fragment the frame. This will allocate all the fragments and
912 * chain them (using skb as the first fragment) to skb->next.
913 * During transmission, we will remove the successfully transmitted
914 * fragments from this list. When the low-level driver rejects one
915 * of the fragments then we will simply pretend to accept the skb
916 * but store it away as pending.
918 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
921 /* update duration/seq/flags of fragments */
924 skb_queue_walk(&tx->skbs, skb) {
925 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
927 hdr = (void *)skb->data;
928 info = IEEE80211_SKB_CB(skb);
930 if (!skb_queue_is_last(&tx->skbs, skb)) {
931 hdr->frame_control |= morefrags;
933 * No multi-rate retries for fragmented frames, that
934 * would completely throw off the NAV at other STAs.
936 info->control.rates[1].idx = -1;
937 info->control.rates[2].idx = -1;
938 info->control.rates[3].idx = -1;
939 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
940 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
942 hdr->frame_control &= ~morefrags;
944 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
951 static ieee80211_tx_result debug_noinline
952 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
960 skb_queue_walk(&tx->skbs, skb) {
961 ac = skb_get_queue_mapping(skb);
962 tx->sta->tx_fragments++;
963 tx->sta->tx_bytes[ac] += skb->len;
966 tx->sta->tx_packets[ac]++;
971 static ieee80211_tx_result debug_noinline
972 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
977 switch (tx->key->conf.cipher) {
978 case WLAN_CIPHER_SUITE_WEP40:
979 case WLAN_CIPHER_SUITE_WEP104:
980 return ieee80211_crypto_wep_encrypt(tx);
981 case WLAN_CIPHER_SUITE_TKIP:
982 return ieee80211_crypto_tkip_encrypt(tx);
983 case WLAN_CIPHER_SUITE_CCMP:
984 return ieee80211_crypto_ccmp_encrypt(tx);
985 case WLAN_CIPHER_SUITE_AES_CMAC:
986 return ieee80211_crypto_aes_cmac_encrypt(tx);
988 return ieee80211_crypto_hw_encrypt(tx);
994 static ieee80211_tx_result debug_noinline
995 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
998 struct ieee80211_hdr *hdr;
1002 skb_queue_walk(&tx->skbs, skb) {
1003 hdr = (void *) skb->data;
1004 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1005 break; /* must not overwrite AID */
1006 if (!skb_queue_is_last(&tx->skbs, skb)) {
1007 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1008 next_len = next->len;
1011 group_addr = is_multicast_ether_addr(hdr->addr1);
1014 ieee80211_duration(tx, skb, group_addr, next_len);
1020 /* actual transmit path */
1022 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1023 struct sk_buff *skb,
1024 struct ieee80211_tx_info *info,
1025 struct tid_ampdu_tx *tid_tx,
1028 bool queued = false;
1029 bool reset_agg_timer = false;
1030 struct sk_buff *purge_skb = NULL;
1032 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1033 info->flags |= IEEE80211_TX_CTL_AMPDU;
1034 reset_agg_timer = true;
1035 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1037 * nothing -- this aggregation session is being started
1038 * but that might still fail with the driver
1041 spin_lock(&tx->sta->lock);
1043 * Need to re-check now, because we may get here
1045 * 1) in the window during which the setup is actually
1046 * already done, but not marked yet because not all
1047 * packets are spliced over to the driver pending
1048 * queue yet -- if this happened we acquire the lock
1049 * either before or after the splice happens, but
1050 * need to recheck which of these cases happened.
1052 * 2) during session teardown, if the OPERATIONAL bit
1053 * was cleared due to the teardown but the pointer
1054 * hasn't been assigned NULL yet (or we loaded it
1055 * before it was assigned) -- in this case it may
1056 * now be NULL which means we should just let the
1057 * packet pass through because splicing the frames
1058 * back is already done.
1060 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1063 /* do nothing, let packet pass through */
1064 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1065 info->flags |= IEEE80211_TX_CTL_AMPDU;
1066 reset_agg_timer = true;
1069 info->control.vif = &tx->sdata->vif;
1070 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1071 __skb_queue_tail(&tid_tx->pending, skb);
1072 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1073 purge_skb = __skb_dequeue(&tid_tx->pending);
1075 spin_unlock(&tx->sta->lock);
1078 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1081 /* reset session timer */
1082 if (reset_agg_timer && tid_tx->timeout)
1083 tid_tx->last_tx = jiffies;
1091 static ieee80211_tx_result
1092 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1093 struct ieee80211_tx_data *tx,
1094 struct sk_buff *skb)
1096 struct ieee80211_local *local = sdata->local;
1097 struct ieee80211_hdr *hdr;
1098 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1102 memset(tx, 0, sizeof(*tx));
1106 __skb_queue_head_init(&tx->skbs);
1109 * If this flag is set to true anywhere, and we get here,
1110 * we are doing the needed processing, so remove the flag
1113 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1115 hdr = (struct ieee80211_hdr *) skb->data;
1117 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1118 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1119 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1121 } else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
1122 IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1123 tx->sdata->control_port_protocol == tx->skb->protocol) {
1124 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1127 tx->sta = sta_info_get(sdata, hdr->addr1);
1129 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1130 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1131 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1132 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1133 struct tid_ampdu_tx *tid_tx;
1135 qc = ieee80211_get_qos_ctl(hdr);
1136 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1138 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1142 queued = ieee80211_tx_prep_agg(tx, skb, info,
1145 if (unlikely(queued))
1150 if (is_multicast_ether_addr(hdr->addr1)) {
1151 tx->flags &= ~IEEE80211_TX_UNICAST;
1152 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1154 tx->flags |= IEEE80211_TX_UNICAST;
1156 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1157 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1158 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1159 info->flags & IEEE80211_TX_CTL_AMPDU)
1160 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1164 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1165 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1166 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1168 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1173 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1174 struct ieee80211_vif *vif,
1175 struct ieee80211_sta *sta,
1176 struct sk_buff_head *skbs,
1179 struct ieee80211_tx_control control;
1180 struct sk_buff *skb, *tmp;
1181 unsigned long flags;
1183 skb_queue_walk_safe(skbs, skb, tmp) {
1184 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1185 int q = info->hw_queue;
1187 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1188 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1189 __skb_unlink(skb, skbs);
1190 ieee80211_free_txskb(&local->hw, skb);
1195 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1196 if (local->queue_stop_reasons[q] ||
1197 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1198 if (unlikely(info->flags &
1199 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1200 if (local->queue_stop_reasons[q] &
1201 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1203 * Drop off-channel frames if queues
1204 * are stopped for any reason other
1205 * than off-channel operation. Never
1208 spin_unlock_irqrestore(
1209 &local->queue_stop_reason_lock,
1211 ieee80211_purge_tx_queue(&local->hw,
1218 * Since queue is stopped, queue up frames for
1219 * later transmission from the tx-pending
1220 * tasklet when the queue is woken again.
1223 skb_queue_splice_init(skbs,
1224 &local->pending[q]);
1226 skb_queue_splice_tail_init(skbs,
1227 &local->pending[q]);
1229 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1234 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1236 info->control.vif = vif;
1239 __skb_unlink(skb, skbs);
1240 drv_tx(local, &control, skb);
1247 * Returns false if the frame couldn't be transmitted but was queued instead.
1249 static bool __ieee80211_tx(struct ieee80211_local *local,
1250 struct sk_buff_head *skbs, int led_len,
1251 struct sta_info *sta, bool txpending)
1253 struct ieee80211_tx_info *info;
1254 struct ieee80211_sub_if_data *sdata;
1255 struct ieee80211_vif *vif;
1256 struct ieee80211_sta *pubsta;
1257 struct sk_buff *skb;
1261 if (WARN_ON(skb_queue_empty(skbs)))
1264 skb = skb_peek(skbs);
1265 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1266 info = IEEE80211_SKB_CB(skb);
1267 sdata = vif_to_sdata(info->control.vif);
1268 if (sta && !sta->uploaded)
1276 switch (sdata->vif.type) {
1277 case NL80211_IFTYPE_MONITOR:
1278 sdata = rcu_dereference(local->monitor_sdata);
1282 vif->hw_queue[skb_get_queue_mapping(skb)];
1283 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1289 case NL80211_IFTYPE_AP_VLAN:
1290 sdata = container_of(sdata->bss,
1291 struct ieee80211_sub_if_data, u.ap);
1298 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1301 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1302 ieee80211_led_tx(local, 1);
1304 WARN_ON_ONCE(!skb_queue_empty(skbs));
1310 * Invoke TX handlers, return 0 on success and non-zero if the
1311 * frame was dropped or queued.
1313 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1315 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1316 ieee80211_tx_result res = TX_DROP;
1318 #define CALL_TXH(txh) \
1321 if (res != TX_CONTINUE) \
1325 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1326 CALL_TXH(ieee80211_tx_h_check_assoc);
1327 CALL_TXH(ieee80211_tx_h_ps_buf);
1328 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1329 CALL_TXH(ieee80211_tx_h_select_key);
1330 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1331 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1333 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1334 __skb_queue_tail(&tx->skbs, tx->skb);
1339 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1340 CALL_TXH(ieee80211_tx_h_sequence);
1341 CALL_TXH(ieee80211_tx_h_fragment);
1342 /* handlers after fragment must be aware of tx info fragmentation! */
1343 CALL_TXH(ieee80211_tx_h_stats);
1344 CALL_TXH(ieee80211_tx_h_encrypt);
1345 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1346 CALL_TXH(ieee80211_tx_h_calculate_duration);
1350 if (unlikely(res == TX_DROP)) {
1351 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1353 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1355 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1357 } else if (unlikely(res == TX_QUEUED)) {
1358 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1366 * Returns false if the frame couldn't be transmitted but was queued instead.
1368 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1369 struct sk_buff *skb, bool txpending,
1370 enum ieee80211_band band)
1372 struct ieee80211_local *local = sdata->local;
1373 struct ieee80211_tx_data tx;
1374 ieee80211_tx_result res_prepare;
1375 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1379 if (unlikely(skb->len < 10)) {
1384 /* initialises tx */
1386 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1388 if (unlikely(res_prepare == TX_DROP)) {
1389 ieee80211_free_txskb(&local->hw, skb);
1391 } else if (unlikely(res_prepare == TX_QUEUED)) {
1397 /* set up hw_queue value early */
1398 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1399 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1401 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1403 if (!invoke_tx_handlers(&tx))
1404 result = __ieee80211_tx(local, &tx.skbs, led_len,
1410 /* device xmit handlers */
1412 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1413 struct sk_buff *skb,
1414 int head_need, bool may_encrypt)
1416 struct ieee80211_local *local = sdata->local;
1419 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1420 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1421 tail_need -= skb_tailroom(skb);
1422 tail_need = max_t(int, tail_need, 0);
1425 if (skb_cloned(skb))
1426 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1427 else if (head_need || tail_need)
1428 I802_DEBUG_INC(local->tx_expand_skb_head);
1432 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1433 wiphy_debug(local->hw.wiphy,
1434 "failed to reallocate TX buffer\n");
1441 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1442 enum ieee80211_band band)
1444 struct ieee80211_local *local = sdata->local;
1445 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1446 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1450 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1452 headroom = local->tx_headroom;
1454 headroom += IEEE80211_ENCRYPT_HEADROOM;
1455 headroom -= skb_headroom(skb);
1456 headroom = max_t(int, 0, headroom);
1458 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1459 ieee80211_free_txskb(&local->hw, skb);
1463 hdr = (struct ieee80211_hdr *) skb->data;
1464 info->control.vif = &sdata->vif;
1466 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1467 if (ieee80211_is_data(hdr->frame_control) &&
1468 is_unicast_ether_addr(hdr->addr1)) {
1469 if (mesh_nexthop_resolve(sdata, skb))
1470 return; /* skb queued: don't free */
1472 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1476 ieee80211_set_qos_hdr(sdata, skb);
1477 ieee80211_tx(sdata, skb, false, band);
1480 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1482 struct ieee80211_radiotap_iterator iterator;
1483 struct ieee80211_radiotap_header *rthdr =
1484 (struct ieee80211_radiotap_header *) skb->data;
1485 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1486 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1490 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1491 IEEE80211_TX_CTL_DONTFRAG;
1494 * for every radiotap entry that is present
1495 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1496 * entries present, or -EINVAL on error)
1500 ret = ieee80211_radiotap_iterator_next(&iterator);
1505 /* see if this argument is something we can use */
1506 switch (iterator.this_arg_index) {
1508 * You must take care when dereferencing iterator.this_arg
1509 * for multibyte types... the pointer is not aligned. Use
1510 * get_unaligned((type *)iterator.this_arg) to dereference
1511 * iterator.this_arg for type "type" safely on all arches.
1513 case IEEE80211_RADIOTAP_FLAGS:
1514 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1516 * this indicates that the skb we have been
1517 * handed has the 32-bit FCS CRC at the end...
1518 * we should react to that by snipping it off
1519 * because it will be recomputed and added
1522 if (skb->len < (iterator._max_length + FCS_LEN))
1525 skb_trim(skb, skb->len - FCS_LEN);
1527 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1528 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1529 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1530 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1533 case IEEE80211_RADIOTAP_TX_FLAGS:
1534 txflags = get_unaligned_le16(iterator.this_arg);
1535 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1536 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1540 * Please update the file
1541 * Documentation/networking/mac80211-injection.txt
1542 * when parsing new fields here.
1550 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1554 * remove the radiotap header
1555 * iterator->_max_length was sanity-checked against
1556 * skb->len by iterator init
1558 skb_pull(skb, iterator._max_length);
1563 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1564 struct net_device *dev)
1566 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1567 struct ieee80211_chanctx_conf *chanctx_conf;
1568 struct ieee80211_channel *chan;
1569 struct ieee80211_radiotap_header *prthdr =
1570 (struct ieee80211_radiotap_header *)skb->data;
1571 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1572 struct ieee80211_hdr *hdr;
1573 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1577 /* check for not even having the fixed radiotap header part */
1578 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1579 goto fail; /* too short to be possibly valid */
1581 /* is it a header version we can trust to find length from? */
1582 if (unlikely(prthdr->it_version))
1583 goto fail; /* only version 0 is supported */
1585 /* then there must be a radiotap header with a length we can use */
1586 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1588 /* does the skb contain enough to deliver on the alleged length? */
1589 if (unlikely(skb->len < len_rthdr))
1590 goto fail; /* skb too short for claimed rt header extent */
1593 * fix up the pointers accounting for the radiotap
1594 * header still being in there. We are being given
1595 * a precooked IEEE80211 header so no need for
1598 skb_set_mac_header(skb, len_rthdr);
1600 * these are just fixed to the end of the rt area since we
1601 * don't have any better information and at this point, nobody cares
1603 skb_set_network_header(skb, len_rthdr);
1604 skb_set_transport_header(skb, len_rthdr);
1606 if (skb->len < len_rthdr + 2)
1609 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1610 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1612 if (skb->len < len_rthdr + hdrlen)
1616 * Initialize skb->protocol if the injected frame is a data frame
1617 * carrying a rfc1042 header
1619 if (ieee80211_is_data(hdr->frame_control) &&
1620 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1621 u8 *payload = (u8 *)hdr + hdrlen;
1623 if (ether_addr_equal(payload, rfc1042_header))
1624 skb->protocol = cpu_to_be16((payload[6] << 8) |
1628 memset(info, 0, sizeof(*info));
1630 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1631 IEEE80211_TX_CTL_INJECTED;
1633 /* process and remove the injection radiotap header */
1634 if (!ieee80211_parse_tx_radiotap(skb))
1640 * We process outgoing injected frames that have a local address
1641 * we handle as though they are non-injected frames.
1642 * This code here isn't entirely correct, the local MAC address
1643 * isn't always enough to find the interface to use; for proper
1644 * VLAN/WDS support we will need a different mechanism (which
1645 * likely isn't going to be monitor interfaces).
1647 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1649 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1650 if (!ieee80211_sdata_running(tmp_sdata))
1652 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1653 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1654 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1656 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1662 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1663 if (!chanctx_conf) {
1664 tmp_sdata = rcu_dereference(local->monitor_sdata);
1667 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1671 chan = chanctx_conf->def.chan;
1672 else if (!local->use_chanctx)
1673 chan = local->_oper_chandef.chan;
1678 * Frame injection is not allowed if beaconing is not allowed
1679 * or if we need radar detection. Beaconing is usually not allowed when
1680 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1681 * Passive scan is also used in world regulatory domains where
1682 * your country is not known and as such it should be treated as
1683 * NO TX unless the channel is explicitly allowed in which case
1684 * your current regulatory domain would not have the passive scan
1687 * Since AP mode uses monitor interfaces to inject/TX management
1688 * frames we can make AP mode the exception to this rule once it
1689 * supports radar detection as its implementation can deal with
1690 * radar detection by itself. We can do that later by adding a
1691 * monitor flag interfaces used for AP support.
1693 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1694 IEEE80211_CHAN_PASSIVE_SCAN)))
1697 ieee80211_xmit(sdata, skb, chan->band);
1700 return NETDEV_TX_OK;
1706 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1710 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1711 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1712 * @skb: packet to be sent
1713 * @dev: incoming interface
1715 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1716 * not be freed, and caller is responsible for either retrying later or freeing
1719 * This function takes in an Ethernet header and encapsulates it with suitable
1720 * IEEE 802.11 header based on which interface the packet is coming in. The
1721 * encapsulated packet will then be passed to master interface, wlan#.11, for
1722 * transmission (through low-level driver).
1724 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1725 struct net_device *dev)
1727 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1728 struct ieee80211_local *local = sdata->local;
1729 struct ieee80211_tx_info *info;
1731 u16 ethertype, hdrlen, meshhdrlen = 0;
1733 struct ieee80211_hdr hdr;
1734 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1735 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1736 const u8 *encaps_data;
1737 int encaps_len, skip_header_bytes;
1739 struct sta_info *sta = NULL;
1740 bool wme_sta = false, authorized = false, tdls_auth = false;
1741 bool tdls_direct = false;
1745 struct ieee80211_chanctx_conf *chanctx_conf;
1746 struct ieee80211_sub_if_data *ap_sdata;
1747 enum ieee80211_band band;
1749 if (unlikely(skb->len < ETH_HLEN))
1752 /* convert Ethernet header to proper 802.11 header (based on
1753 * operation mode) */
1754 ethertype = (skb->data[12] << 8) | skb->data[13];
1755 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1759 switch (sdata->vif.type) {
1760 case NL80211_IFTYPE_AP_VLAN:
1761 sta = rcu_dereference(sdata->u.vlan.sta);
1763 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1765 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1766 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1767 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1768 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1770 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1771 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1773 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1775 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1778 band = chanctx_conf->def.chan->band;
1782 case NL80211_IFTYPE_AP:
1783 if (sdata->vif.type == NL80211_IFTYPE_AP)
1784 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1787 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1789 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1790 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1791 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1793 band = chanctx_conf->def.chan->band;
1795 case NL80211_IFTYPE_WDS:
1796 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1798 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1799 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1800 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1801 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1804 * This is the exception! WDS style interfaces are prohibited
1805 * when channel contexts are in used so this must be valid
1807 band = local->hw.conf.chandef.chan->band;
1809 #ifdef CONFIG_MAC80211_MESH
1810 case NL80211_IFTYPE_MESH_POINT:
1811 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1812 /* Do not send frames with mesh_ttl == 0 */
1813 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1817 if (!is_multicast_ether_addr(skb->data)) {
1818 struct sta_info *next_hop;
1819 bool mpp_lookup = true;
1821 mpath = mesh_path_lookup(sdata, skb->data);
1824 next_hop = rcu_dereference(mpath->next_hop);
1826 !(mpath->flags & (MESH_PATH_ACTIVE |
1827 MESH_PATH_RESOLVING)))
1832 mppath = mpp_path_lookup(sdata, skb->data);
1834 if (mppath && mpath)
1835 mesh_path_del(mpath->sdata, mpath->dst);
1839 * Use address extension if it is a packet from
1840 * another interface or if we know the destination
1841 * is being proxied by a portal (i.e. portal address
1842 * differs from proxied address)
1844 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1845 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1846 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1847 skb->data, skb->data + ETH_ALEN);
1848 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1851 /* DS -> MBSS (802.11-2012 13.11.3.3).
1852 * For unicast with unknown forwarding information,
1853 * destination might be in the MBSS or if that fails
1854 * forwarded to another mesh gate. In either case
1855 * resolution will be handled in ieee80211_xmit(), so
1856 * leave the original DA. This also works for mcast */
1857 const u8 *mesh_da = skb->data;
1860 mesh_da = mppath->mpp;
1862 mesh_da = mpath->dst;
1864 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1865 mesh_da, sdata->vif.addr);
1866 if (is_multicast_ether_addr(mesh_da))
1867 /* DA TA mSA AE:SA */
1868 meshhdrlen = ieee80211_new_mesh_header(
1870 skb->data + ETH_ALEN, NULL);
1872 /* RA TA mDA mSA AE:DA SA */
1873 meshhdrlen = ieee80211_new_mesh_header(
1874 sdata, &mesh_hdr, skb->data,
1875 skb->data + ETH_ALEN);
1878 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1881 band = chanctx_conf->def.chan->band;
1884 case NL80211_IFTYPE_STATION:
1885 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1886 bool tdls_peer = false;
1888 sta = sta_info_get(sdata, skb->data);
1890 authorized = test_sta_flag(sta,
1891 WLAN_STA_AUTHORIZED);
1892 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1893 tdls_peer = test_sta_flag(sta,
1894 WLAN_STA_TDLS_PEER);
1895 tdls_auth = test_sta_flag(sta,
1896 WLAN_STA_TDLS_PEER_AUTH);
1900 * If the TDLS link is enabled, send everything
1901 * directly. Otherwise, allow TDLS setup frames
1902 * to be transmitted indirectly.
1904 tdls_direct = tdls_peer && (tdls_auth ||
1905 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1906 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1910 /* link during setup - throw out frames to peer */
1915 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1916 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1917 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1919 } else if (sdata->u.mgd.use_4addr &&
1920 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1921 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1922 IEEE80211_FCTL_TODS);
1924 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1925 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1926 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1927 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1930 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1932 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1933 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1934 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1937 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1940 band = chanctx_conf->def.chan->band;
1942 case NL80211_IFTYPE_ADHOC:
1944 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1945 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1946 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1948 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1951 band = chanctx_conf->def.chan->band;
1958 * There's no need to try to look up the destination
1959 * if it is a multicast address (which can only happen
1962 multicast = is_multicast_ether_addr(hdr.addr1);
1964 sta = sta_info_get(sdata, hdr.addr1);
1966 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1967 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1971 /* For mesh, the use of the QoS header is mandatory */
1972 if (ieee80211_vif_is_mesh(&sdata->vif))
1975 /* receiver and we are QoS enabled, use a QoS type frame */
1976 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1977 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1982 * Drop unicast frames to unauthorised stations unless they are
1983 * EAPOL frames from the local station.
1985 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1986 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1987 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1988 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1989 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1990 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1991 dev->name, hdr.addr1);
1994 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1999 if (unlikely(!multicast && skb->sk &&
2000 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2001 struct sk_buff *orig_skb = skb;
2003 skb = skb_clone(skb, GFP_ATOMIC);
2005 unsigned long flags;
2008 spin_lock_irqsave(&local->ack_status_lock, flags);
2009 id = idr_alloc(&local->ack_status_frames, orig_skb,
2010 1, 0x10000, GFP_ATOMIC);
2011 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2015 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2016 } else if (skb_shared(skb)) {
2017 kfree_skb(orig_skb);
2023 /* couldn't clone -- lose tx status ... */
2029 * If the skb is shared we need to obtain our own copy.
2031 if (skb_shared(skb)) {
2032 struct sk_buff *tmp_skb = skb;
2034 /* can't happen -- skb is a clone if info_id != 0 */
2037 skb = skb_clone(skb, GFP_ATOMIC);
2044 hdr.frame_control = fc;
2045 hdr.duration_id = 0;
2048 skip_header_bytes = ETH_HLEN;
2049 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2050 encaps_data = bridge_tunnel_header;
2051 encaps_len = sizeof(bridge_tunnel_header);
2052 skip_header_bytes -= 2;
2053 } else if (ethertype >= ETH_P_802_3_MIN) {
2054 encaps_data = rfc1042_header;
2055 encaps_len = sizeof(rfc1042_header);
2056 skip_header_bytes -= 2;
2062 nh_pos = skb_network_header(skb) - skb->data;
2063 h_pos = skb_transport_header(skb) - skb->data;
2065 skb_pull(skb, skip_header_bytes);
2066 nh_pos -= skip_header_bytes;
2067 h_pos -= skip_header_bytes;
2069 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2072 * So we need to modify the skb header and hence need a copy of
2073 * that. The head_need variable above doesn't, so far, include
2074 * the needed header space that we don't need right away. If we
2075 * can, then we don't reallocate right now but only after the
2076 * frame arrives at the master device (if it does...)
2078 * If we cannot, however, then we will reallocate to include all
2079 * the ever needed space. Also, if we need to reallocate it anyway,
2080 * make it big enough for everything we may ever need.
2083 if (head_need > 0 || skb_cloned(skb)) {
2084 head_need += IEEE80211_ENCRYPT_HEADROOM;
2085 head_need += local->tx_headroom;
2086 head_need = max_t(int, 0, head_need);
2087 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2088 ieee80211_free_txskb(&local->hw, skb);
2095 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2096 nh_pos += encaps_len;
2097 h_pos += encaps_len;
2100 #ifdef CONFIG_MAC80211_MESH
2101 if (meshhdrlen > 0) {
2102 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2103 nh_pos += meshhdrlen;
2104 h_pos += meshhdrlen;
2108 if (ieee80211_is_data_qos(fc)) {
2109 __le16 *qos_control;
2111 qos_control = (__le16*) skb_push(skb, 2);
2112 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2114 * Maybe we could actually set some fields here, for now just
2115 * initialise to zero to indicate no special operation.
2119 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2124 dev->stats.tx_packets++;
2125 dev->stats.tx_bytes += skb->len;
2127 /* Update skb pointers to various headers since this modified frame
2128 * is going to go through Linux networking code that may potentially
2129 * need things like pointer to IP header. */
2130 skb_set_mac_header(skb, 0);
2131 skb_set_network_header(skb, nh_pos);
2132 skb_set_transport_header(skb, h_pos);
2134 info = IEEE80211_SKB_CB(skb);
2135 memset(info, 0, sizeof(*info));
2137 dev->trans_start = jiffies;
2139 info->flags = info_flags;
2140 info->ack_frame_id = info_id;
2142 ieee80211_xmit(sdata, skb, band);
2145 return NETDEV_TX_OK;
2151 return NETDEV_TX_OK;
2156 * ieee80211_clear_tx_pending may not be called in a context where
2157 * it is possible that it packets could come in again.
2159 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2161 struct sk_buff *skb;
2164 for (i = 0; i < local->hw.queues; i++) {
2165 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2166 ieee80211_free_txskb(&local->hw, skb);
2171 * Returns false if the frame couldn't be transmitted but was queued instead,
2172 * which in this case means re-queued -- take as an indication to stop sending
2173 * more pending frames.
2175 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2176 struct sk_buff *skb)
2178 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2179 struct ieee80211_sub_if_data *sdata;
2180 struct sta_info *sta;
2181 struct ieee80211_hdr *hdr;
2183 struct ieee80211_chanctx_conf *chanctx_conf;
2185 sdata = vif_to_sdata(info->control.vif);
2187 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2188 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2189 if (unlikely(!chanctx_conf)) {
2193 result = ieee80211_tx(sdata, skb, true,
2194 chanctx_conf->def.chan->band);
2196 struct sk_buff_head skbs;
2198 __skb_queue_head_init(&skbs);
2199 __skb_queue_tail(&skbs, skb);
2201 hdr = (struct ieee80211_hdr *)skb->data;
2202 sta = sta_info_get(sdata, hdr->addr1);
2204 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2211 * Transmit all pending packets. Called from tasklet.
2213 void ieee80211_tx_pending(unsigned long data)
2215 struct ieee80211_local *local = (struct ieee80211_local *)data;
2216 unsigned long flags;
2222 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2223 for (i = 0; i < local->hw.queues; i++) {
2225 * If queue is stopped by something other than due to pending
2226 * frames, or we have no pending frames, proceed to next queue.
2228 if (local->queue_stop_reasons[i] ||
2229 skb_queue_empty(&local->pending[i]))
2232 while (!skb_queue_empty(&local->pending[i])) {
2233 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2234 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2236 if (WARN_ON(!info->control.vif)) {
2237 ieee80211_free_txskb(&local->hw, skb);
2241 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2244 txok = ieee80211_tx_pending_skb(local, skb);
2245 spin_lock_irqsave(&local->queue_stop_reason_lock,
2251 if (skb_queue_empty(&local->pending[i]))
2252 ieee80211_propagate_queue_wake(local, i);
2254 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2259 /* functions for drivers to get certain frames */
2261 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2262 struct ps_data *ps, struct sk_buff *skb)
2266 int i, have_bits = 0, n1, n2;
2268 /* Generate bitmap for TIM only if there are any STAs in power save
2270 if (atomic_read(&ps->num_sta_ps) > 0)
2271 /* in the hope that this is faster than
2272 * checking byte-for-byte */
2273 have_bits = !bitmap_empty((unsigned long*)ps->tim,
2274 IEEE80211_MAX_AID+1);
2276 if (ps->dtim_count == 0)
2277 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2281 tim = pos = (u8 *) skb_put(skb, 6);
2282 *pos++ = WLAN_EID_TIM;
2284 *pos++ = ps->dtim_count;
2285 *pos++ = sdata->vif.bss_conf.dtim_period;
2287 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2290 ps->dtim_bc_mc = aid0 == 1;
2293 /* Find largest even number N1 so that bits numbered 1 through
2294 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2295 * (N2 + 1) x 8 through 2007 are 0. */
2297 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2304 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2311 /* Bitmap control */
2313 /* Part Virt Bitmap */
2314 skb_put(skb, n2 - n1);
2315 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2317 tim[1] = n2 - n1 + 4;
2319 *pos++ = aid0; /* Bitmap control */
2320 *pos++ = 0; /* Part Virt Bitmap */
2324 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2325 struct ps_data *ps, struct sk_buff *skb)
2327 struct ieee80211_local *local = sdata->local;
2330 * Not very nice, but we want to allow the driver to call
2331 * ieee80211_beacon_get() as a response to the set_tim()
2332 * callback. That, however, is already invoked under the
2333 * sta_lock to guarantee consistent and race-free update
2334 * of the tim bitmap in mac80211 and the driver.
2336 if (local->tim_in_locked_section) {
2337 __ieee80211_beacon_add_tim(sdata, ps, skb);
2339 spin_lock_bh(&local->tim_lock);
2340 __ieee80211_beacon_add_tim(sdata, ps, skb);
2341 spin_unlock_bh(&local->tim_lock);
2347 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2348 struct ieee80211_vif *vif,
2349 u16 *tim_offset, u16 *tim_length)
2351 struct ieee80211_local *local = hw_to_local(hw);
2352 struct sk_buff *skb = NULL;
2353 struct ieee80211_tx_info *info;
2354 struct ieee80211_sub_if_data *sdata = NULL;
2355 enum ieee80211_band band;
2356 struct ieee80211_tx_rate_control txrc;
2357 struct ieee80211_chanctx_conf *chanctx_conf;
2361 sdata = vif_to_sdata(vif);
2362 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2364 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2372 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2373 struct ieee80211_if_ap *ap = &sdata->u.ap;
2374 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2378 * headroom, head length,
2379 * tail length and maximum TIM length
2381 skb = dev_alloc_skb(local->tx_headroom +
2383 beacon->tail_len + 256);
2387 skb_reserve(skb, local->tx_headroom);
2388 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2391 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2394 *tim_offset = beacon->head_len;
2396 *tim_length = skb->len - beacon->head_len;
2399 memcpy(skb_put(skb, beacon->tail_len),
2400 beacon->tail, beacon->tail_len);
2403 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2404 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2405 struct ieee80211_hdr *hdr;
2406 struct beacon_data *presp = rcu_dereference(ifibss->presp);
2411 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
2414 skb_reserve(skb, local->tx_headroom);
2415 memcpy(skb_put(skb, presp->head_len), presp->head,
2418 hdr = (struct ieee80211_hdr *) skb->data;
2419 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2420 IEEE80211_STYPE_BEACON);
2421 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2422 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2423 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
2428 if (ifmsh->sync_ops)
2429 ifmsh->sync_ops->adjust_tbtt(
2432 skb = dev_alloc_skb(local->tx_headroom +
2438 skb_reserve(skb, local->tx_headroom);
2439 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2440 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2441 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
2447 band = chanctx_conf->def.chan->band;
2449 info = IEEE80211_SKB_CB(skb);
2451 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2452 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2455 memset(&txrc, 0, sizeof(txrc));
2457 txrc.sband = local->hw.wiphy->bands[band];
2458 txrc.bss_conf = &sdata->vif.bss_conf;
2460 txrc.reported_rate.idx = -1;
2461 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2462 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2463 txrc.max_rate_idx = -1;
2465 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2467 rate_control_get_rate(sdata, NULL, &txrc);
2469 info->control.vif = vif;
2471 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2472 IEEE80211_TX_CTL_ASSIGN_SEQ |
2473 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2478 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2480 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2481 struct ieee80211_vif *vif)
2483 struct ieee80211_if_ap *ap = NULL;
2484 struct sk_buff *skb = NULL;
2485 struct probe_resp *presp = NULL;
2486 struct ieee80211_hdr *hdr;
2487 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2489 if (sdata->vif.type != NL80211_IFTYPE_AP)
2495 presp = rcu_dereference(ap->probe_resp);
2499 skb = dev_alloc_skb(presp->len);
2503 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2505 hdr = (struct ieee80211_hdr *) skb->data;
2506 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2512 EXPORT_SYMBOL(ieee80211_proberesp_get);
2514 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2515 struct ieee80211_vif *vif)
2517 struct ieee80211_sub_if_data *sdata;
2518 struct ieee80211_if_managed *ifmgd;
2519 struct ieee80211_pspoll *pspoll;
2520 struct ieee80211_local *local;
2521 struct sk_buff *skb;
2523 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2526 sdata = vif_to_sdata(vif);
2527 ifmgd = &sdata->u.mgd;
2528 local = sdata->local;
2530 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2534 skb_reserve(skb, local->hw.extra_tx_headroom);
2536 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2537 memset(pspoll, 0, sizeof(*pspoll));
2538 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2539 IEEE80211_STYPE_PSPOLL);
2540 pspoll->aid = cpu_to_le16(ifmgd->aid);
2542 /* aid in PS-Poll has its two MSBs each set to 1 */
2543 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2545 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2546 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2550 EXPORT_SYMBOL(ieee80211_pspoll_get);
2552 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2553 struct ieee80211_vif *vif)
2555 struct ieee80211_hdr_3addr *nullfunc;
2556 struct ieee80211_sub_if_data *sdata;
2557 struct ieee80211_if_managed *ifmgd;
2558 struct ieee80211_local *local;
2559 struct sk_buff *skb;
2561 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2564 sdata = vif_to_sdata(vif);
2565 ifmgd = &sdata->u.mgd;
2566 local = sdata->local;
2568 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2572 skb_reserve(skb, local->hw.extra_tx_headroom);
2574 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2576 memset(nullfunc, 0, sizeof(*nullfunc));
2577 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2578 IEEE80211_STYPE_NULLFUNC |
2579 IEEE80211_FCTL_TODS);
2580 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2581 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2582 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2586 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2588 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2589 struct ieee80211_vif *vif,
2590 const u8 *ssid, size_t ssid_len,
2593 struct ieee80211_sub_if_data *sdata;
2594 struct ieee80211_local *local;
2595 struct ieee80211_hdr_3addr *hdr;
2596 struct sk_buff *skb;
2600 sdata = vif_to_sdata(vif);
2601 local = sdata->local;
2602 ie_ssid_len = 2 + ssid_len;
2604 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2605 ie_ssid_len + tailroom);
2609 skb_reserve(skb, local->hw.extra_tx_headroom);
2611 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2612 memset(hdr, 0, sizeof(*hdr));
2613 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2614 IEEE80211_STYPE_PROBE_REQ);
2615 eth_broadcast_addr(hdr->addr1);
2616 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2617 eth_broadcast_addr(hdr->addr3);
2619 pos = skb_put(skb, ie_ssid_len);
2620 *pos++ = WLAN_EID_SSID;
2623 memcpy(pos, ssid, ssid_len);
2628 EXPORT_SYMBOL(ieee80211_probereq_get);
2630 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2631 const void *frame, size_t frame_len,
2632 const struct ieee80211_tx_info *frame_txctl,
2633 struct ieee80211_rts *rts)
2635 const struct ieee80211_hdr *hdr = frame;
2637 rts->frame_control =
2638 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2639 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2641 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2642 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2644 EXPORT_SYMBOL(ieee80211_rts_get);
2646 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2647 const void *frame, size_t frame_len,
2648 const struct ieee80211_tx_info *frame_txctl,
2649 struct ieee80211_cts *cts)
2651 const struct ieee80211_hdr *hdr = frame;
2653 cts->frame_control =
2654 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2655 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2656 frame_len, frame_txctl);
2657 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2659 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2662 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2663 struct ieee80211_vif *vif)
2665 struct ieee80211_local *local = hw_to_local(hw);
2666 struct sk_buff *skb = NULL;
2667 struct ieee80211_tx_data tx;
2668 struct ieee80211_sub_if_data *sdata;
2670 struct ieee80211_tx_info *info;
2671 struct ieee80211_chanctx_conf *chanctx_conf;
2673 sdata = vif_to_sdata(vif);
2676 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2681 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2682 struct beacon_data *beacon =
2683 rcu_dereference(sdata->u.ap.beacon);
2685 if (!beacon || !beacon->head)
2688 ps = &sdata->u.ap.ps;
2689 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2690 ps = &sdata->u.mesh.ps;
2695 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2696 goto out; /* send buffered bc/mc only after DTIM beacon */
2699 skb = skb_dequeue(&ps->bc_buf);
2702 local->total_ps_buffered--;
2704 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2705 struct ieee80211_hdr *hdr =
2706 (struct ieee80211_hdr *) skb->data;
2707 /* more buffered multicast/broadcast frames ==> set
2708 * MoreData flag in IEEE 802.11 header to inform PS
2710 hdr->frame_control |=
2711 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2714 if (sdata->vif.type == NL80211_IFTYPE_AP)
2715 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
2716 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2718 dev_kfree_skb_any(skb);
2721 info = IEEE80211_SKB_CB(skb);
2723 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2724 info->band = chanctx_conf->def.chan->band;
2726 if (invoke_tx_handlers(&tx))
2733 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2735 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2736 struct sk_buff *skb, int tid,
2737 enum ieee80211_band band)
2739 int ac = ieee802_1d_to_ac[tid & 7];
2741 skb_set_mac_header(skb, 0);
2742 skb_set_network_header(skb, 0);
2743 skb_set_transport_header(skb, 0);
2745 skb_set_queue_mapping(skb, ac);
2746 skb->priority = tid;
2748 skb->dev = sdata->dev;
2751 * The other path calling ieee80211_xmit is from the tasklet,
2752 * and while we can handle concurrent transmissions locking
2753 * requirements are that we do not come into tx with bhs on.
2756 ieee80211_xmit(sdata, skb, band);