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->flags & IEEE80211_TX_PS_BUFFERED)
288 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
290 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
291 if (unlikely(!assoc &&
292 ieee80211_is_data(hdr->frame_control))) {
293 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
294 sdata_info(tx->sdata,
295 "dropped data frame to not associated station %pM\n",
298 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
301 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
302 ieee80211_is_data(hdr->frame_control) &&
303 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
305 * No associated STAs - no need to send multicast
314 /* This function is called whenever the AP is about to exceed the maximum limit
315 * of buffered frames for power saving STAs. This situation should not really
316 * happen often during normal operation, so dropping the oldest buffered packet
317 * from each queue should be OK to make some room for new frames. */
318 static void purge_old_ps_buffers(struct ieee80211_local *local)
320 int total = 0, purged = 0;
322 struct ieee80211_sub_if_data *sdata;
323 struct sta_info *sta;
325 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
328 if (sdata->vif.type == NL80211_IFTYPE_AP)
329 ps = &sdata->u.ap.ps;
330 else if (ieee80211_vif_is_mesh(&sdata->vif))
331 ps = &sdata->u.mesh.ps;
335 skb = skb_dequeue(&ps->bc_buf);
340 total += skb_queue_len(&ps->bc_buf);
344 * Drop one frame from each station from the lowest-priority
345 * AC that has frames at all.
347 list_for_each_entry_rcu(sta, &local->sta_list, list) {
350 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
351 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
352 total += skb_queue_len(&sta->ps_tx_buf[ac]);
355 ieee80211_free_txskb(&local->hw, skb);
361 local->total_ps_buffered = total;
362 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
365 static ieee80211_tx_result
366 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
368 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
369 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
373 * broadcast/multicast frame
375 * If any of the associated/peer stations is in power save mode,
376 * the frame is buffered to be sent after DTIM beacon frame.
377 * This is done either by the hardware or us.
380 /* powersaving STAs currently only in AP/VLAN/mesh mode */
381 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
382 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
386 ps = &tx->sdata->bss->ps;
387 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
388 ps = &tx->sdata->u.mesh.ps;
394 /* no buffering for ordered frames */
395 if (ieee80211_has_order(hdr->frame_control))
398 if (ieee80211_is_probe_req(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_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
451 struct ieee80211_local *local = tx->local;
456 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
457 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
458 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
459 int ac = skb_get_queue_mapping(tx->skb);
461 /* only deauth, disassoc and action are bufferable MMPDUs */
462 if (ieee80211_is_mgmt(hdr->frame_control) &&
463 !ieee80211_is_deauth(hdr->frame_control) &&
464 !ieee80211_is_disassoc(hdr->frame_control) &&
465 !ieee80211_is_action(hdr->frame_control)) {
466 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
470 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
471 sta->sta.addr, sta->sta.aid, ac);
472 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
473 purge_old_ps_buffers(tx->local);
475 /* sync with ieee80211_sta_ps_deliver_wakeup */
476 spin_lock(&sta->ps_lock);
478 * STA woke up the meantime and all the frames on ps_tx_buf have
479 * been queued to pending queue. No reordering can happen, go
480 * ahead and Tx the packet.
482 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
483 !test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
484 spin_unlock(&sta->ps_lock);
488 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
489 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
491 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
493 ieee80211_free_txskb(&local->hw, old);
495 tx->local->total_ps_buffered++;
497 info->control.jiffies = jiffies;
498 info->control.vif = &tx->sdata->vif;
499 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
500 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
501 spin_unlock(&sta->ps_lock);
503 if (!timer_pending(&local->sta_cleanup))
504 mod_timer(&local->sta_cleanup,
505 round_jiffies(jiffies +
506 STA_INFO_CLEANUP_INTERVAL));
509 * We queued up some frames, so the TIM bit might
510 * need to be set, recalculate it.
512 sta_info_recalc_tim(sta);
515 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
517 "STA %pM in PS mode, but polling/in SP -> send frame\n",
524 static ieee80211_tx_result debug_noinline
525 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
527 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
529 if (tx->flags & IEEE80211_TX_UNICAST)
530 return ieee80211_tx_h_unicast_ps_buf(tx);
532 return ieee80211_tx_h_multicast_ps_buf(tx);
535 static ieee80211_tx_result debug_noinline
536 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
538 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
540 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
541 tx->sdata->control_port_no_encrypt))
542 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
547 static ieee80211_tx_result debug_noinline
548 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
550 struct ieee80211_key *key;
551 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
552 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
554 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
556 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
558 else if (ieee80211_is_mgmt(hdr->frame_control) &&
559 is_multicast_ether_addr(hdr->addr1) &&
560 ieee80211_is_robust_mgmt_frame(hdr) &&
561 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
563 else if (is_multicast_ether_addr(hdr->addr1) &&
564 (key = rcu_dereference(tx->sdata->default_multicast_key)))
566 else if (!is_multicast_ether_addr(hdr->addr1) &&
567 (key = rcu_dereference(tx->sdata->default_unicast_key)))
569 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
571 else if (!tx->sdata->drop_unencrypted)
573 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
575 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
576 !(ieee80211_is_action(hdr->frame_control) &&
577 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
579 else if (ieee80211_is_mgmt(hdr->frame_control) &&
580 !ieee80211_is_robust_mgmt_frame(hdr))
583 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
588 bool skip_hw = false;
590 tx->key->tx_rx_count++;
591 /* TODO: add threshold stuff again */
593 switch (tx->key->conf.cipher) {
594 case WLAN_CIPHER_SUITE_WEP40:
595 case WLAN_CIPHER_SUITE_WEP104:
596 case WLAN_CIPHER_SUITE_TKIP:
597 if (!ieee80211_is_data_present(hdr->frame_control))
600 case WLAN_CIPHER_SUITE_CCMP:
601 if (!ieee80211_is_data_present(hdr->frame_control) &&
602 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
606 skip_hw = (tx->key->conf.flags &
607 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
608 ieee80211_is_mgmt(hdr->frame_control);
610 case WLAN_CIPHER_SUITE_AES_CMAC:
611 if (!ieee80211_is_mgmt(hdr->frame_control))
616 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
617 !ieee80211_is_deauth(hdr->frame_control)))
620 if (!skip_hw && tx->key &&
621 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
622 info->control.hw_key = &tx->key->conf;
628 static ieee80211_tx_result debug_noinline
629 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
631 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
632 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
633 struct ieee80211_supported_band *sband;
635 struct ieee80211_tx_rate_control txrc;
636 struct ieee80211_sta_rates *ratetbl = NULL;
639 memset(&txrc, 0, sizeof(txrc));
641 sband = tx->local->hw.wiphy->bands[info->band];
643 len = min_t(u32, tx->skb->len + FCS_LEN,
644 tx->local->hw.wiphy->frag_threshold);
646 /* set up the tx rate control struct we give the RC algo */
647 txrc.hw = &tx->local->hw;
649 txrc.bss_conf = &tx->sdata->vif.bss_conf;
651 txrc.reported_rate.idx = -1;
652 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
653 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
654 txrc.max_rate_idx = -1;
656 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
658 if (tx->sdata->rc_has_mcs_mask[info->band])
659 txrc.rate_idx_mcs_mask =
660 tx->sdata->rc_rateidx_mcs_mask[info->band];
662 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
663 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
664 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
666 /* set up RTS protection if desired */
667 if (len > tx->local->hw.wiphy->rts_threshold) {
671 info->control.use_rts = txrc.rts;
672 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
675 * Use short preamble if the BSS can handle it, but not for
676 * management frames unless we know the receiver can handle
677 * that -- the management frame might be to a station that
678 * just wants a probe response.
680 if (tx->sdata->vif.bss_conf.use_short_preamble &&
681 (ieee80211_is_data(hdr->frame_control) ||
682 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
683 txrc.short_preamble = true;
685 info->control.short_preamble = txrc.short_preamble;
688 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
691 * Lets not bother rate control if we're associated and cannot
692 * talk to the sta. This should not happen.
694 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
695 !rate_usable_index_exists(sband, &tx->sta->sta),
696 "%s: Dropped data frame as no usable bitrate found while "
697 "scanning and associated. Target station: "
698 "%pM on %d GHz band\n",
699 tx->sdata->name, hdr->addr1,
704 * If we're associated with the sta at this point we know we can at
705 * least send the frame at the lowest bit rate.
707 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
709 if (tx->sta && !info->control.skip_table)
710 ratetbl = rcu_dereference(tx->sta->sta.rates);
712 if (unlikely(info->control.rates[0].idx < 0)) {
714 struct ieee80211_tx_rate rate = {
715 .idx = ratetbl->rate[0].idx,
716 .flags = ratetbl->rate[0].flags,
717 .count = ratetbl->rate[0].count
720 if (ratetbl->rate[0].idx < 0)
728 tx->rate = info->control.rates[0];
731 if (txrc.reported_rate.idx < 0) {
732 txrc.reported_rate = tx->rate;
733 if (tx->sta && ieee80211_is_data(hdr->frame_control))
734 tx->sta->last_tx_rate = txrc.reported_rate;
736 tx->sta->last_tx_rate = txrc.reported_rate;
741 if (unlikely(!info->control.rates[0].count))
742 info->control.rates[0].count = 1;
744 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
745 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
746 info->control.rates[0].count = 1;
751 static ieee80211_tx_result debug_noinline
752 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
754 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
755 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
761 * Packet injection may want to control the sequence
762 * number, if we have no matching interface then we
763 * neither assign one ourselves nor ask the driver to.
765 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
768 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
771 if (ieee80211_hdrlen(hdr->frame_control) < 24)
774 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
778 * Anything but QoS data that has a sequence number field
779 * (is long enough) gets a sequence number from the global
782 if (!ieee80211_is_data_qos(hdr->frame_control)) {
783 /* driver should assign sequence number */
784 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
785 /* for pure STA mode without beacons, we can do it */
786 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
787 tx->sdata->sequence_number += 0x10;
792 * This should be true for injected/management frames only, for
793 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
794 * above since they are not QoS-data frames.
799 /* include per-STA, per-TID sequence counter */
801 qc = ieee80211_get_qos_ctl(hdr);
802 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
803 seq = &tx->sta->tid_seq[tid];
805 hdr->seq_ctrl = cpu_to_le16(*seq);
807 /* Increase the sequence number. */
808 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
813 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
814 struct sk_buff *skb, int hdrlen,
817 struct ieee80211_local *local = tx->local;
818 struct ieee80211_tx_info *info;
820 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
821 int pos = hdrlen + per_fragm;
822 int rem = skb->len - hdrlen - per_fragm;
824 if (WARN_ON(rem < 0))
827 /* first fragment was already added to queue by caller */
830 int fraglen = per_fragm;
835 tmp = dev_alloc_skb(local->tx_headroom +
837 IEEE80211_ENCRYPT_HEADROOM +
838 IEEE80211_ENCRYPT_TAILROOM);
842 __skb_queue_tail(&tx->skbs, tmp);
844 skb_reserve(tmp, local->tx_headroom +
845 IEEE80211_ENCRYPT_HEADROOM);
846 /* copy control information */
847 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
849 info = IEEE80211_SKB_CB(tmp);
850 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
851 IEEE80211_TX_CTL_FIRST_FRAGMENT);
854 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
856 skb_copy_queue_mapping(tmp, skb);
857 tmp->priority = skb->priority;
860 /* copy header and data */
861 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
862 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
867 /* adjust first fragment's length */
868 skb_trim(skb, hdrlen + per_fragm);
872 static ieee80211_tx_result debug_noinline
873 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
875 struct sk_buff *skb = tx->skb;
876 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
877 struct ieee80211_hdr *hdr = (void *)skb->data;
878 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
882 /* no matter what happens, tx->skb moves to tx->skbs */
883 __skb_queue_tail(&tx->skbs, skb);
886 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
889 if (tx->local->ops->set_frag_threshold)
893 * Warn when submitting a fragmented A-MPDU frame and drop it.
894 * This scenario is handled in ieee80211_tx_prepare but extra
895 * caution taken here as fragmented ampdu may cause Tx stop.
897 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
900 hdrlen = ieee80211_hdrlen(hdr->frame_control);
902 /* internal error, why isn't DONTFRAG set? */
903 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
907 * Now fragment the frame. This will allocate all the fragments and
908 * chain them (using skb as the first fragment) to skb->next.
909 * During transmission, we will remove the successfully transmitted
910 * fragments from this list. When the low-level driver rejects one
911 * of the fragments then we will simply pretend to accept the skb
912 * but store it away as pending.
914 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
917 /* update duration/seq/flags of fragments */
920 skb_queue_walk(&tx->skbs, skb) {
921 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
923 hdr = (void *)skb->data;
924 info = IEEE80211_SKB_CB(skb);
926 if (!skb_queue_is_last(&tx->skbs, skb)) {
927 hdr->frame_control |= morefrags;
929 * No multi-rate retries for fragmented frames, that
930 * would completely throw off the NAV at other STAs.
932 info->control.rates[1].idx = -1;
933 info->control.rates[2].idx = -1;
934 info->control.rates[3].idx = -1;
935 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
936 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
938 hdr->frame_control &= ~morefrags;
940 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
947 static ieee80211_tx_result debug_noinline
948 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
956 skb_queue_walk(&tx->skbs, skb) {
957 ac = skb_get_queue_mapping(skb);
958 tx->sta->tx_fragments++;
959 tx->sta->tx_bytes[ac] += skb->len;
962 tx->sta->tx_packets[ac]++;
967 static ieee80211_tx_result debug_noinline
968 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
973 switch (tx->key->conf.cipher) {
974 case WLAN_CIPHER_SUITE_WEP40:
975 case WLAN_CIPHER_SUITE_WEP104:
976 return ieee80211_crypto_wep_encrypt(tx);
977 case WLAN_CIPHER_SUITE_TKIP:
978 return ieee80211_crypto_tkip_encrypt(tx);
979 case WLAN_CIPHER_SUITE_CCMP:
980 return ieee80211_crypto_ccmp_encrypt(tx);
981 case WLAN_CIPHER_SUITE_AES_CMAC:
982 return ieee80211_crypto_aes_cmac_encrypt(tx);
984 return ieee80211_crypto_hw_encrypt(tx);
990 static ieee80211_tx_result debug_noinline
991 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
994 struct ieee80211_hdr *hdr;
998 skb_queue_walk(&tx->skbs, skb) {
999 hdr = (void *) skb->data;
1000 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1001 break; /* must not overwrite AID */
1002 if (!skb_queue_is_last(&tx->skbs, skb)) {
1003 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1004 next_len = next->len;
1007 group_addr = is_multicast_ether_addr(hdr->addr1);
1010 ieee80211_duration(tx, skb, group_addr, next_len);
1016 /* actual transmit path */
1018 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1019 struct sk_buff *skb,
1020 struct ieee80211_tx_info *info,
1021 struct tid_ampdu_tx *tid_tx,
1024 bool queued = false;
1025 bool reset_agg_timer = false;
1026 struct sk_buff *purge_skb = NULL;
1028 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1029 info->flags |= IEEE80211_TX_CTL_AMPDU;
1030 reset_agg_timer = true;
1031 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1033 * nothing -- this aggregation session is being started
1034 * but that might still fail with the driver
1037 spin_lock(&tx->sta->lock);
1039 * Need to re-check now, because we may get here
1041 * 1) in the window during which the setup is actually
1042 * already done, but not marked yet because not all
1043 * packets are spliced over to the driver pending
1044 * queue yet -- if this happened we acquire the lock
1045 * either before or after the splice happens, but
1046 * need to recheck which of these cases happened.
1048 * 2) during session teardown, if the OPERATIONAL bit
1049 * was cleared due to the teardown but the pointer
1050 * hasn't been assigned NULL yet (or we loaded it
1051 * before it was assigned) -- in this case it may
1052 * now be NULL which means we should just let the
1053 * packet pass through because splicing the frames
1054 * back is already done.
1056 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1059 /* do nothing, let packet pass through */
1060 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1061 info->flags |= IEEE80211_TX_CTL_AMPDU;
1062 reset_agg_timer = true;
1065 info->control.vif = &tx->sdata->vif;
1066 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1067 __skb_queue_tail(&tid_tx->pending, skb);
1068 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1069 purge_skb = __skb_dequeue(&tid_tx->pending);
1071 spin_unlock(&tx->sta->lock);
1074 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1077 /* reset session timer */
1078 if (reset_agg_timer && tid_tx->timeout)
1079 tid_tx->last_tx = jiffies;
1087 static ieee80211_tx_result
1088 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1089 struct ieee80211_tx_data *tx,
1090 struct sk_buff *skb)
1092 struct ieee80211_local *local = sdata->local;
1093 struct ieee80211_hdr *hdr;
1094 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1098 memset(tx, 0, sizeof(*tx));
1102 __skb_queue_head_init(&tx->skbs);
1105 * If this flag is set to true anywhere, and we get here,
1106 * we are doing the needed processing, so remove the flag
1109 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1111 hdr = (struct ieee80211_hdr *) skb->data;
1113 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1114 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1115 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1117 } else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
1118 IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1119 tx->sdata->control_port_protocol == tx->skb->protocol) {
1120 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1123 tx->sta = sta_info_get(sdata, hdr->addr1);
1125 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1126 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1127 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1128 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1129 struct tid_ampdu_tx *tid_tx;
1131 qc = ieee80211_get_qos_ctl(hdr);
1132 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1134 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1138 queued = ieee80211_tx_prep_agg(tx, skb, info,
1141 if (unlikely(queued))
1146 if (is_multicast_ether_addr(hdr->addr1)) {
1147 tx->flags &= ~IEEE80211_TX_UNICAST;
1148 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1150 tx->flags |= IEEE80211_TX_UNICAST;
1152 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1153 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1154 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1155 info->flags & IEEE80211_TX_CTL_AMPDU)
1156 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1160 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1161 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1162 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1164 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1169 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1170 struct ieee80211_vif *vif,
1171 struct ieee80211_sta *sta,
1172 struct sk_buff_head *skbs,
1175 struct ieee80211_tx_control control;
1176 struct sk_buff *skb, *tmp;
1177 unsigned long flags;
1179 skb_queue_walk_safe(skbs, skb, tmp) {
1180 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1181 int q = info->hw_queue;
1183 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1184 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1185 __skb_unlink(skb, skbs);
1186 ieee80211_free_txskb(&local->hw, skb);
1191 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1192 if (local->queue_stop_reasons[q] ||
1193 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1194 if (unlikely(info->flags &
1195 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1196 if (local->queue_stop_reasons[q] &
1197 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1199 * Drop off-channel frames if queues
1200 * are stopped for any reason other
1201 * than off-channel operation. Never
1204 spin_unlock_irqrestore(
1205 &local->queue_stop_reason_lock,
1207 ieee80211_purge_tx_queue(&local->hw,
1214 * Since queue is stopped, queue up frames for
1215 * later transmission from the tx-pending
1216 * tasklet when the queue is woken again.
1219 skb_queue_splice_init(skbs,
1220 &local->pending[q]);
1222 skb_queue_splice_tail_init(skbs,
1223 &local->pending[q]);
1225 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1230 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1232 info->control.vif = vif;
1235 __skb_unlink(skb, skbs);
1236 drv_tx(local, &control, skb);
1243 * Returns false if the frame couldn't be transmitted but was queued instead.
1245 static bool __ieee80211_tx(struct ieee80211_local *local,
1246 struct sk_buff_head *skbs, int led_len,
1247 struct sta_info *sta, bool txpending)
1249 struct ieee80211_tx_info *info;
1250 struct ieee80211_sub_if_data *sdata;
1251 struct ieee80211_vif *vif;
1252 struct ieee80211_sta *pubsta;
1253 struct sk_buff *skb;
1257 if (WARN_ON(skb_queue_empty(skbs)))
1260 skb = skb_peek(skbs);
1261 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1262 info = IEEE80211_SKB_CB(skb);
1263 sdata = vif_to_sdata(info->control.vif);
1264 if (sta && !sta->uploaded)
1272 switch (sdata->vif.type) {
1273 case NL80211_IFTYPE_MONITOR:
1274 sdata = rcu_dereference(local->monitor_sdata);
1278 vif->hw_queue[skb_get_queue_mapping(skb)];
1279 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1285 case NL80211_IFTYPE_AP_VLAN:
1286 sdata = container_of(sdata->bss,
1287 struct ieee80211_sub_if_data, u.ap);
1294 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1297 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1298 ieee80211_led_tx(local, 1);
1300 WARN_ON_ONCE(!skb_queue_empty(skbs));
1306 * Invoke TX handlers, return 0 on success and non-zero if the
1307 * frame was dropped or queued.
1309 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1311 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1312 ieee80211_tx_result res = TX_DROP;
1314 #define CALL_TXH(txh) \
1317 if (res != TX_CONTINUE) \
1321 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1322 CALL_TXH(ieee80211_tx_h_check_assoc);
1323 CALL_TXH(ieee80211_tx_h_ps_buf);
1324 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1325 CALL_TXH(ieee80211_tx_h_select_key);
1326 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1327 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1329 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1330 __skb_queue_tail(&tx->skbs, tx->skb);
1335 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1336 CALL_TXH(ieee80211_tx_h_sequence);
1337 CALL_TXH(ieee80211_tx_h_fragment);
1338 /* handlers after fragment must be aware of tx info fragmentation! */
1339 CALL_TXH(ieee80211_tx_h_stats);
1340 CALL_TXH(ieee80211_tx_h_encrypt);
1341 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1342 CALL_TXH(ieee80211_tx_h_calculate_duration);
1346 if (unlikely(res == TX_DROP)) {
1347 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1349 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1351 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1353 } else if (unlikely(res == TX_QUEUED)) {
1354 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1362 * Returns false if the frame couldn't be transmitted but was queued instead.
1364 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1365 struct sk_buff *skb, bool txpending,
1366 enum ieee80211_band band)
1368 struct ieee80211_local *local = sdata->local;
1369 struct ieee80211_tx_data tx;
1370 ieee80211_tx_result res_prepare;
1371 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1375 if (unlikely(skb->len < 10)) {
1380 /* initialises tx */
1382 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1384 if (unlikely(res_prepare == TX_DROP)) {
1385 ieee80211_free_txskb(&local->hw, skb);
1387 } else if (unlikely(res_prepare == TX_QUEUED)) {
1393 /* set up hw_queue value early */
1394 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1395 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1397 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1399 if (!invoke_tx_handlers(&tx))
1400 result = __ieee80211_tx(local, &tx.skbs, led_len,
1406 /* device xmit handlers */
1408 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1409 struct sk_buff *skb,
1410 int head_need, bool may_encrypt)
1412 struct ieee80211_local *local = sdata->local;
1415 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1416 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1417 tail_need -= skb_tailroom(skb);
1418 tail_need = max_t(int, tail_need, 0);
1421 if (skb_cloned(skb))
1422 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1423 else if (head_need || tail_need)
1424 I802_DEBUG_INC(local->tx_expand_skb_head);
1428 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1429 wiphy_debug(local->hw.wiphy,
1430 "failed to reallocate TX buffer\n");
1437 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1438 enum ieee80211_band band)
1440 struct ieee80211_local *local = sdata->local;
1441 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1442 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1446 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1448 headroom = local->tx_headroom;
1450 headroom += IEEE80211_ENCRYPT_HEADROOM;
1451 headroom -= skb_headroom(skb);
1452 headroom = max_t(int, 0, headroom);
1454 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1455 ieee80211_free_txskb(&local->hw, skb);
1459 hdr = (struct ieee80211_hdr *) skb->data;
1460 info->control.vif = &sdata->vif;
1462 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1463 if (ieee80211_is_data(hdr->frame_control) &&
1464 is_unicast_ether_addr(hdr->addr1)) {
1465 if (mesh_nexthop_resolve(sdata, skb))
1466 return; /* skb queued: don't free */
1468 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1472 ieee80211_set_qos_hdr(sdata, skb);
1473 ieee80211_tx(sdata, skb, false, band);
1476 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1478 struct ieee80211_radiotap_iterator iterator;
1479 struct ieee80211_radiotap_header *rthdr =
1480 (struct ieee80211_radiotap_header *) skb->data;
1481 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1482 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1486 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1487 IEEE80211_TX_CTL_DONTFRAG;
1490 * for every radiotap entry that is present
1491 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1492 * entries present, or -EINVAL on error)
1496 ret = ieee80211_radiotap_iterator_next(&iterator);
1501 /* see if this argument is something we can use */
1502 switch (iterator.this_arg_index) {
1504 * You must take care when dereferencing iterator.this_arg
1505 * for multibyte types... the pointer is not aligned. Use
1506 * get_unaligned((type *)iterator.this_arg) to dereference
1507 * iterator.this_arg for type "type" safely on all arches.
1509 case IEEE80211_RADIOTAP_FLAGS:
1510 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1512 * this indicates that the skb we have been
1513 * handed has the 32-bit FCS CRC at the end...
1514 * we should react to that by snipping it off
1515 * because it will be recomputed and added
1518 if (skb->len < (iterator._max_length + FCS_LEN))
1521 skb_trim(skb, skb->len - FCS_LEN);
1523 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1524 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1525 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1526 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1529 case IEEE80211_RADIOTAP_TX_FLAGS:
1530 txflags = get_unaligned_le16(iterator.this_arg);
1531 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1532 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1536 * Please update the file
1537 * Documentation/networking/mac80211-injection.txt
1538 * when parsing new fields here.
1546 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1550 * remove the radiotap header
1551 * iterator->_max_length was sanity-checked against
1552 * skb->len by iterator init
1554 skb_pull(skb, iterator._max_length);
1559 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1560 struct net_device *dev)
1562 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1563 struct ieee80211_chanctx_conf *chanctx_conf;
1564 struct ieee80211_channel *chan;
1565 struct ieee80211_radiotap_header *prthdr =
1566 (struct ieee80211_radiotap_header *)skb->data;
1567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1568 struct ieee80211_hdr *hdr;
1569 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1573 /* check for not even having the fixed radiotap header part */
1574 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1575 goto fail; /* too short to be possibly valid */
1577 /* is it a header version we can trust to find length from? */
1578 if (unlikely(prthdr->it_version))
1579 goto fail; /* only version 0 is supported */
1581 /* then there must be a radiotap header with a length we can use */
1582 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1584 /* does the skb contain enough to deliver on the alleged length? */
1585 if (unlikely(skb->len < len_rthdr))
1586 goto fail; /* skb too short for claimed rt header extent */
1589 * fix up the pointers accounting for the radiotap
1590 * header still being in there. We are being given
1591 * a precooked IEEE80211 header so no need for
1594 skb_set_mac_header(skb, len_rthdr);
1596 * these are just fixed to the end of the rt area since we
1597 * don't have any better information and at this point, nobody cares
1599 skb_set_network_header(skb, len_rthdr);
1600 skb_set_transport_header(skb, len_rthdr);
1602 if (skb->len < len_rthdr + 2)
1605 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1606 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1608 if (skb->len < len_rthdr + hdrlen)
1612 * Initialize skb->protocol if the injected frame is a data frame
1613 * carrying a rfc1042 header
1615 if (ieee80211_is_data(hdr->frame_control) &&
1616 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1617 u8 *payload = (u8 *)hdr + hdrlen;
1619 if (ether_addr_equal(payload, rfc1042_header))
1620 skb->protocol = cpu_to_be16((payload[6] << 8) |
1624 memset(info, 0, sizeof(*info));
1626 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1627 IEEE80211_TX_CTL_INJECTED;
1629 /* process and remove the injection radiotap header */
1630 if (!ieee80211_parse_tx_radiotap(skb))
1636 * We process outgoing injected frames that have a local address
1637 * we handle as though they are non-injected frames.
1638 * This code here isn't entirely correct, the local MAC address
1639 * isn't always enough to find the interface to use; for proper
1640 * VLAN/WDS support we will need a different mechanism (which
1641 * likely isn't going to be monitor interfaces).
1643 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1645 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1646 if (!ieee80211_sdata_running(tmp_sdata))
1648 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1649 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1650 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1652 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1658 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1659 if (!chanctx_conf) {
1660 tmp_sdata = rcu_dereference(local->monitor_sdata);
1663 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1667 chan = chanctx_conf->def.chan;
1668 else if (!local->use_chanctx)
1669 chan = local->_oper_chandef.chan;
1674 * Frame injection is not allowed if beaconing is not allowed
1675 * or if we need radar detection. Beaconing is usually not allowed when
1676 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1677 * Passive scan is also used in world regulatory domains where
1678 * your country is not known and as such it should be treated as
1679 * NO TX unless the channel is explicitly allowed in which case
1680 * your current regulatory domain would not have the passive scan
1683 * Since AP mode uses monitor interfaces to inject/TX management
1684 * frames we can make AP mode the exception to this rule once it
1685 * supports radar detection as its implementation can deal with
1686 * radar detection by itself. We can do that later by adding a
1687 * monitor flag interfaces used for AP support.
1689 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1690 IEEE80211_CHAN_PASSIVE_SCAN)))
1693 ieee80211_xmit(sdata, skb, chan->band);
1696 return NETDEV_TX_OK;
1702 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1706 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1707 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1708 * @skb: packet to be sent
1709 * @dev: incoming interface
1711 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1712 * not be freed, and caller is responsible for either retrying later or freeing
1715 * This function takes in an Ethernet header and encapsulates it with suitable
1716 * IEEE 802.11 header based on which interface the packet is coming in. The
1717 * encapsulated packet will then be passed to master interface, wlan#.11, for
1718 * transmission (through low-level driver).
1720 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1721 struct net_device *dev)
1723 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1724 struct ieee80211_local *local = sdata->local;
1725 struct ieee80211_tx_info *info;
1727 u16 ethertype, hdrlen, meshhdrlen = 0;
1729 struct ieee80211_hdr hdr;
1730 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1731 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1732 const u8 *encaps_data;
1733 int encaps_len, skip_header_bytes;
1735 struct sta_info *sta = NULL;
1736 bool wme_sta = false, authorized = false, tdls_auth = false;
1737 bool tdls_direct = false;
1741 struct ieee80211_chanctx_conf *chanctx_conf;
1742 struct ieee80211_sub_if_data *ap_sdata;
1743 enum ieee80211_band band;
1745 if (unlikely(skb->len < ETH_HLEN))
1748 /* convert Ethernet header to proper 802.11 header (based on
1749 * operation mode) */
1750 ethertype = (skb->data[12] << 8) | skb->data[13];
1751 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1755 switch (sdata->vif.type) {
1756 case NL80211_IFTYPE_AP_VLAN:
1757 sta = rcu_dereference(sdata->u.vlan.sta);
1759 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1761 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1762 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1763 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1764 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1766 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1767 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1769 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1771 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1774 band = chanctx_conf->def.chan->band;
1778 case NL80211_IFTYPE_AP:
1779 if (sdata->vif.type == NL80211_IFTYPE_AP)
1780 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1783 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1785 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1786 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1787 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1789 band = chanctx_conf->def.chan->band;
1791 case NL80211_IFTYPE_WDS:
1792 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1794 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1795 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1796 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1797 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1800 * This is the exception! WDS style interfaces are prohibited
1801 * when channel contexts are in used so this must be valid
1803 band = local->hw.conf.chandef.chan->band;
1805 #ifdef CONFIG_MAC80211_MESH
1806 case NL80211_IFTYPE_MESH_POINT:
1807 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1808 /* Do not send frames with mesh_ttl == 0 */
1809 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1813 if (!is_multicast_ether_addr(skb->data)) {
1814 struct sta_info *next_hop;
1815 bool mpp_lookup = true;
1817 mpath = mesh_path_lookup(sdata, skb->data);
1820 next_hop = rcu_dereference(mpath->next_hop);
1822 !(mpath->flags & (MESH_PATH_ACTIVE |
1823 MESH_PATH_RESOLVING)))
1828 mppath = mpp_path_lookup(sdata, skb->data);
1830 if (mppath && mpath)
1831 mesh_path_del(mpath->sdata, mpath->dst);
1835 * Use address extension if it is a packet from
1836 * another interface or if we know the destination
1837 * is being proxied by a portal (i.e. portal address
1838 * differs from proxied address)
1840 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1841 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1842 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1843 skb->data, skb->data + ETH_ALEN);
1844 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1847 /* DS -> MBSS (802.11-2012 13.11.3.3).
1848 * For unicast with unknown forwarding information,
1849 * destination might be in the MBSS or if that fails
1850 * forwarded to another mesh gate. In either case
1851 * resolution will be handled in ieee80211_xmit(), so
1852 * leave the original DA. This also works for mcast */
1853 const u8 *mesh_da = skb->data;
1856 mesh_da = mppath->mpp;
1858 mesh_da = mpath->dst;
1860 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1861 mesh_da, sdata->vif.addr);
1862 if (is_multicast_ether_addr(mesh_da))
1863 /* DA TA mSA AE:SA */
1864 meshhdrlen = ieee80211_new_mesh_header(
1866 skb->data + ETH_ALEN, NULL);
1868 /* RA TA mDA mSA AE:DA SA */
1869 meshhdrlen = ieee80211_new_mesh_header(
1870 sdata, &mesh_hdr, skb->data,
1871 skb->data + ETH_ALEN);
1874 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1877 band = chanctx_conf->def.chan->band;
1880 case NL80211_IFTYPE_STATION:
1881 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1882 bool tdls_peer = false;
1884 sta = sta_info_get(sdata, skb->data);
1886 authorized = test_sta_flag(sta,
1887 WLAN_STA_AUTHORIZED);
1888 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1889 tdls_peer = test_sta_flag(sta,
1890 WLAN_STA_TDLS_PEER);
1891 tdls_auth = test_sta_flag(sta,
1892 WLAN_STA_TDLS_PEER_AUTH);
1896 * If the TDLS link is enabled, send everything
1897 * directly. Otherwise, allow TDLS setup frames
1898 * to be transmitted indirectly.
1900 tdls_direct = tdls_peer && (tdls_auth ||
1901 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1902 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1906 /* link during setup - throw out frames to peer */
1911 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1912 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1913 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1915 } else if (sdata->u.mgd.use_4addr &&
1916 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1917 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1918 IEEE80211_FCTL_TODS);
1920 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1921 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1922 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1923 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1926 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1928 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1929 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1930 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1933 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1936 band = chanctx_conf->def.chan->band;
1938 case NL80211_IFTYPE_ADHOC:
1940 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1941 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1942 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1944 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1947 band = chanctx_conf->def.chan->band;
1954 * There's no need to try to look up the destination
1955 * if it is a multicast address (which can only happen
1958 multicast = is_multicast_ether_addr(hdr.addr1);
1960 sta = sta_info_get(sdata, hdr.addr1);
1962 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1963 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1967 /* For mesh, the use of the QoS header is mandatory */
1968 if (ieee80211_vif_is_mesh(&sdata->vif))
1971 /* receiver and we are QoS enabled, use a QoS type frame */
1972 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1973 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1978 * Drop unicast frames to unauthorised stations unless they are
1979 * EAPOL frames from the local station.
1981 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1982 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1983 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1984 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1985 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1986 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1987 dev->name, hdr.addr1);
1990 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1995 if (unlikely(!multicast && skb->sk &&
1996 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1997 struct sk_buff *orig_skb = skb;
1999 skb = skb_clone(skb, GFP_ATOMIC);
2001 unsigned long flags;
2004 spin_lock_irqsave(&local->ack_status_lock, flags);
2005 id = idr_alloc(&local->ack_status_frames, orig_skb,
2006 1, 0x10000, GFP_ATOMIC);
2007 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2011 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2012 } else if (skb_shared(skb)) {
2013 kfree_skb(orig_skb);
2019 /* couldn't clone -- lose tx status ... */
2025 * If the skb is shared we need to obtain our own copy.
2027 if (skb_shared(skb)) {
2028 struct sk_buff *tmp_skb = skb;
2030 /* can't happen -- skb is a clone if info_id != 0 */
2033 skb = skb_clone(skb, GFP_ATOMIC);
2040 hdr.frame_control = fc;
2041 hdr.duration_id = 0;
2044 skip_header_bytes = ETH_HLEN;
2045 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2046 encaps_data = bridge_tunnel_header;
2047 encaps_len = sizeof(bridge_tunnel_header);
2048 skip_header_bytes -= 2;
2049 } else if (ethertype >= ETH_P_802_3_MIN) {
2050 encaps_data = rfc1042_header;
2051 encaps_len = sizeof(rfc1042_header);
2052 skip_header_bytes -= 2;
2058 nh_pos = skb_network_header(skb) - skb->data;
2059 h_pos = skb_transport_header(skb) - skb->data;
2061 skb_pull(skb, skip_header_bytes);
2062 nh_pos -= skip_header_bytes;
2063 h_pos -= skip_header_bytes;
2065 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2068 * So we need to modify the skb header and hence need a copy of
2069 * that. The head_need variable above doesn't, so far, include
2070 * the needed header space that we don't need right away. If we
2071 * can, then we don't reallocate right now but only after the
2072 * frame arrives at the master device (if it does...)
2074 * If we cannot, however, then we will reallocate to include all
2075 * the ever needed space. Also, if we need to reallocate it anyway,
2076 * make it big enough for everything we may ever need.
2079 if (head_need > 0 || skb_cloned(skb)) {
2080 head_need += IEEE80211_ENCRYPT_HEADROOM;
2081 head_need += local->tx_headroom;
2082 head_need = max_t(int, 0, head_need);
2083 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2084 ieee80211_free_txskb(&local->hw, skb);
2091 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2092 nh_pos += encaps_len;
2093 h_pos += encaps_len;
2096 #ifdef CONFIG_MAC80211_MESH
2097 if (meshhdrlen > 0) {
2098 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2099 nh_pos += meshhdrlen;
2100 h_pos += meshhdrlen;
2104 if (ieee80211_is_data_qos(fc)) {
2105 __le16 *qos_control;
2107 qos_control = (__le16*) skb_push(skb, 2);
2108 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2110 * Maybe we could actually set some fields here, for now just
2111 * initialise to zero to indicate no special operation.
2115 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2120 dev->stats.tx_packets++;
2121 dev->stats.tx_bytes += skb->len;
2123 /* Update skb pointers to various headers since this modified frame
2124 * is going to go through Linux networking code that may potentially
2125 * need things like pointer to IP header. */
2126 skb_set_mac_header(skb, 0);
2127 skb_set_network_header(skb, nh_pos);
2128 skb_set_transport_header(skb, h_pos);
2130 info = IEEE80211_SKB_CB(skb);
2131 memset(info, 0, sizeof(*info));
2133 dev->trans_start = jiffies;
2135 info->flags = info_flags;
2136 info->ack_frame_id = info_id;
2138 ieee80211_xmit(sdata, skb, band);
2141 return NETDEV_TX_OK;
2147 return NETDEV_TX_OK;
2152 * ieee80211_clear_tx_pending may not be called in a context where
2153 * it is possible that it packets could come in again.
2155 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2157 struct sk_buff *skb;
2160 for (i = 0; i < local->hw.queues; i++) {
2161 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2162 ieee80211_free_txskb(&local->hw, skb);
2167 * Returns false if the frame couldn't be transmitted but was queued instead,
2168 * which in this case means re-queued -- take as an indication to stop sending
2169 * more pending frames.
2171 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2172 struct sk_buff *skb)
2174 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2175 struct ieee80211_sub_if_data *sdata;
2176 struct sta_info *sta;
2177 struct ieee80211_hdr *hdr;
2179 struct ieee80211_chanctx_conf *chanctx_conf;
2181 sdata = vif_to_sdata(info->control.vif);
2183 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2184 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2185 if (unlikely(!chanctx_conf)) {
2189 result = ieee80211_tx(sdata, skb, true,
2190 chanctx_conf->def.chan->band);
2192 struct sk_buff_head skbs;
2194 __skb_queue_head_init(&skbs);
2195 __skb_queue_tail(&skbs, skb);
2197 hdr = (struct ieee80211_hdr *)skb->data;
2198 sta = sta_info_get(sdata, hdr->addr1);
2200 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2207 * Transmit all pending packets. Called from tasklet.
2209 void ieee80211_tx_pending(unsigned long data)
2211 struct ieee80211_local *local = (struct ieee80211_local *)data;
2212 unsigned long flags;
2218 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2219 for (i = 0; i < local->hw.queues; i++) {
2221 * If queue is stopped by something other than due to pending
2222 * frames, or we have no pending frames, proceed to next queue.
2224 if (local->queue_stop_reasons[i] ||
2225 skb_queue_empty(&local->pending[i]))
2228 while (!skb_queue_empty(&local->pending[i])) {
2229 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2230 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2232 if (WARN_ON(!info->control.vif)) {
2233 ieee80211_free_txskb(&local->hw, skb);
2237 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2240 txok = ieee80211_tx_pending_skb(local, skb);
2241 spin_lock_irqsave(&local->queue_stop_reason_lock,
2247 if (skb_queue_empty(&local->pending[i]))
2248 ieee80211_propagate_queue_wake(local, i);
2250 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2255 /* functions for drivers to get certain frames */
2257 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2258 struct ps_data *ps, struct sk_buff *skb)
2262 int i, have_bits = 0, n1, n2;
2264 /* Generate bitmap for TIM only if there are any STAs in power save
2266 if (atomic_read(&ps->num_sta_ps) > 0)
2267 /* in the hope that this is faster than
2268 * checking byte-for-byte */
2269 have_bits = !bitmap_empty((unsigned long*)ps->tim,
2270 IEEE80211_MAX_AID+1);
2272 if (ps->dtim_count == 0)
2273 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2277 tim = pos = (u8 *) skb_put(skb, 6);
2278 *pos++ = WLAN_EID_TIM;
2280 *pos++ = ps->dtim_count;
2281 *pos++ = sdata->vif.bss_conf.dtim_period;
2283 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2286 ps->dtim_bc_mc = aid0 == 1;
2289 /* Find largest even number N1 so that bits numbered 1 through
2290 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2291 * (N2 + 1) x 8 through 2007 are 0. */
2293 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2300 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2307 /* Bitmap control */
2309 /* Part Virt Bitmap */
2310 skb_put(skb, n2 - n1);
2311 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2313 tim[1] = n2 - n1 + 4;
2315 *pos++ = aid0; /* Bitmap control */
2316 *pos++ = 0; /* Part Virt Bitmap */
2320 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2321 struct ps_data *ps, struct sk_buff *skb)
2323 struct ieee80211_local *local = sdata->local;
2326 * Not very nice, but we want to allow the driver to call
2327 * ieee80211_beacon_get() as a response to the set_tim()
2328 * callback. That, however, is already invoked under the
2329 * sta_lock to guarantee consistent and race-free update
2330 * of the tim bitmap in mac80211 and the driver.
2332 if (local->tim_in_locked_section) {
2333 __ieee80211_beacon_add_tim(sdata, ps, skb);
2335 spin_lock_bh(&local->tim_lock);
2336 __ieee80211_beacon_add_tim(sdata, ps, skb);
2337 spin_unlock_bh(&local->tim_lock);
2343 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2344 struct ieee80211_vif *vif,
2345 u16 *tim_offset, u16 *tim_length)
2347 struct ieee80211_local *local = hw_to_local(hw);
2348 struct sk_buff *skb = NULL;
2349 struct ieee80211_tx_info *info;
2350 struct ieee80211_sub_if_data *sdata = NULL;
2351 enum ieee80211_band band;
2352 struct ieee80211_tx_rate_control txrc;
2353 struct ieee80211_chanctx_conf *chanctx_conf;
2357 sdata = vif_to_sdata(vif);
2358 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2360 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2368 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2369 struct ieee80211_if_ap *ap = &sdata->u.ap;
2370 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2374 * headroom, head length,
2375 * tail length and maximum TIM length
2377 skb = dev_alloc_skb(local->tx_headroom +
2379 beacon->tail_len + 256);
2383 skb_reserve(skb, local->tx_headroom);
2384 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2387 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2390 *tim_offset = beacon->head_len;
2392 *tim_length = skb->len - beacon->head_len;
2395 memcpy(skb_put(skb, beacon->tail_len),
2396 beacon->tail, beacon->tail_len);
2399 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2400 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2401 struct ieee80211_hdr *hdr;
2402 struct beacon_data *presp = rcu_dereference(ifibss->presp);
2407 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
2410 skb_reserve(skb, local->tx_headroom);
2411 memcpy(skb_put(skb, presp->head_len), presp->head,
2414 hdr = (struct ieee80211_hdr *) skb->data;
2415 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2416 IEEE80211_STYPE_BEACON);
2417 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2418 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2419 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
2424 if (ifmsh->sync_ops)
2425 ifmsh->sync_ops->adjust_tbtt(
2428 skb = dev_alloc_skb(local->tx_headroom +
2434 skb_reserve(skb, local->tx_headroom);
2435 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2436 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2437 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
2443 band = chanctx_conf->def.chan->band;
2445 info = IEEE80211_SKB_CB(skb);
2447 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2448 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2451 memset(&txrc, 0, sizeof(txrc));
2453 txrc.sband = local->hw.wiphy->bands[band];
2454 txrc.bss_conf = &sdata->vif.bss_conf;
2456 txrc.reported_rate.idx = -1;
2457 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2458 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2459 txrc.max_rate_idx = -1;
2461 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2463 rate_control_get_rate(sdata, NULL, &txrc);
2465 info->control.vif = vif;
2467 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2468 IEEE80211_TX_CTL_ASSIGN_SEQ |
2469 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2474 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2476 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2477 struct ieee80211_vif *vif)
2479 struct ieee80211_if_ap *ap = NULL;
2480 struct sk_buff *skb = NULL;
2481 struct probe_resp *presp = NULL;
2482 struct ieee80211_hdr *hdr;
2483 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2485 if (sdata->vif.type != NL80211_IFTYPE_AP)
2491 presp = rcu_dereference(ap->probe_resp);
2495 skb = dev_alloc_skb(presp->len);
2499 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2501 hdr = (struct ieee80211_hdr *) skb->data;
2502 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2508 EXPORT_SYMBOL(ieee80211_proberesp_get);
2510 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2511 struct ieee80211_vif *vif)
2513 struct ieee80211_sub_if_data *sdata;
2514 struct ieee80211_if_managed *ifmgd;
2515 struct ieee80211_pspoll *pspoll;
2516 struct ieee80211_local *local;
2517 struct sk_buff *skb;
2519 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2522 sdata = vif_to_sdata(vif);
2523 ifmgd = &sdata->u.mgd;
2524 local = sdata->local;
2526 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2530 skb_reserve(skb, local->hw.extra_tx_headroom);
2532 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2533 memset(pspoll, 0, sizeof(*pspoll));
2534 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2535 IEEE80211_STYPE_PSPOLL);
2536 pspoll->aid = cpu_to_le16(ifmgd->aid);
2538 /* aid in PS-Poll has its two MSBs each set to 1 */
2539 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2541 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2542 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2546 EXPORT_SYMBOL(ieee80211_pspoll_get);
2548 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2549 struct ieee80211_vif *vif)
2551 struct ieee80211_hdr_3addr *nullfunc;
2552 struct ieee80211_sub_if_data *sdata;
2553 struct ieee80211_if_managed *ifmgd;
2554 struct ieee80211_local *local;
2555 struct sk_buff *skb;
2557 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2560 sdata = vif_to_sdata(vif);
2561 ifmgd = &sdata->u.mgd;
2562 local = sdata->local;
2564 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2568 skb_reserve(skb, local->hw.extra_tx_headroom);
2570 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2572 memset(nullfunc, 0, sizeof(*nullfunc));
2573 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2574 IEEE80211_STYPE_NULLFUNC |
2575 IEEE80211_FCTL_TODS);
2576 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2577 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2578 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2582 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2584 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2585 struct ieee80211_vif *vif,
2586 const u8 *ssid, size_t ssid_len,
2589 struct ieee80211_sub_if_data *sdata;
2590 struct ieee80211_local *local;
2591 struct ieee80211_hdr_3addr *hdr;
2592 struct sk_buff *skb;
2596 sdata = vif_to_sdata(vif);
2597 local = sdata->local;
2598 ie_ssid_len = 2 + ssid_len;
2600 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2601 ie_ssid_len + tailroom);
2605 skb_reserve(skb, local->hw.extra_tx_headroom);
2607 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2608 memset(hdr, 0, sizeof(*hdr));
2609 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2610 IEEE80211_STYPE_PROBE_REQ);
2611 eth_broadcast_addr(hdr->addr1);
2612 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2613 eth_broadcast_addr(hdr->addr3);
2615 pos = skb_put(skb, ie_ssid_len);
2616 *pos++ = WLAN_EID_SSID;
2619 memcpy(pos, ssid, ssid_len);
2624 EXPORT_SYMBOL(ieee80211_probereq_get);
2626 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2627 const void *frame, size_t frame_len,
2628 const struct ieee80211_tx_info *frame_txctl,
2629 struct ieee80211_rts *rts)
2631 const struct ieee80211_hdr *hdr = frame;
2633 rts->frame_control =
2634 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2635 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2637 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2638 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2640 EXPORT_SYMBOL(ieee80211_rts_get);
2642 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2643 const void *frame, size_t frame_len,
2644 const struct ieee80211_tx_info *frame_txctl,
2645 struct ieee80211_cts *cts)
2647 const struct ieee80211_hdr *hdr = frame;
2649 cts->frame_control =
2650 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2651 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2652 frame_len, frame_txctl);
2653 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2655 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2658 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2659 struct ieee80211_vif *vif)
2661 struct ieee80211_local *local = hw_to_local(hw);
2662 struct sk_buff *skb = NULL;
2663 struct ieee80211_tx_data tx;
2664 struct ieee80211_sub_if_data *sdata;
2666 struct ieee80211_tx_info *info;
2667 struct ieee80211_chanctx_conf *chanctx_conf;
2669 sdata = vif_to_sdata(vif);
2672 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2677 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2678 struct beacon_data *beacon =
2679 rcu_dereference(sdata->u.ap.beacon);
2681 if (!beacon || !beacon->head)
2684 ps = &sdata->u.ap.ps;
2685 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2686 ps = &sdata->u.mesh.ps;
2691 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2692 goto out; /* send buffered bc/mc only after DTIM beacon */
2695 skb = skb_dequeue(&ps->bc_buf);
2698 local->total_ps_buffered--;
2700 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2701 struct ieee80211_hdr *hdr =
2702 (struct ieee80211_hdr *) skb->data;
2703 /* more buffered multicast/broadcast frames ==> set
2704 * MoreData flag in IEEE 802.11 header to inform PS
2706 hdr->frame_control |=
2707 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2710 if (sdata->vif.type == NL80211_IFTYPE_AP)
2711 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
2712 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2714 dev_kfree_skb_any(skb);
2717 info = IEEE80211_SKB_CB(skb);
2719 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2720 info->band = chanctx_conf->def.chan->band;
2722 if (invoke_tx_handlers(&tx))
2729 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2731 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2732 struct sk_buff *skb, int tid,
2733 enum ieee80211_band band)
2735 int ac = ieee802_1d_to_ac[tid & 7];
2737 skb_set_mac_header(skb, 0);
2738 skb_set_network_header(skb, 0);
2739 skb_set_transport_header(skb, 0);
2741 skb_set_queue_mapping(skb, ac);
2742 skb->priority = tid;
2744 skb->dev = sdata->dev;
2747 * The other path calling ieee80211_xmit is from the tasklet,
2748 * and while we can handle concurrent transmissions locking
2749 * requirements are that we do not come into tx with bhs on.
2752 ieee80211_xmit(sdata, skb, band);