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, shift;
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 shift = ieee80211_vif_get_shift(&tx->sdata->vif);
158 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
159 if (ieee80211_is_data_qos(hdr->frame_control) &&
160 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
163 /* Time needed to transmit ACK
164 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
165 * to closest integer */
166 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
167 tx->sdata->vif.bss_conf.use_short_preamble,
171 /* Frame is fragmented: duration increases with time needed to
172 * transmit next fragment plus ACK and 2 x SIFS. */
173 dur *= 2; /* ACK + SIFS */
175 dur += ieee80211_frame_duration(sband->band, next_frag_len,
176 txrate->bitrate, erp,
177 tx->sdata->vif.bss_conf.use_short_preamble,
181 return cpu_to_le16(dur);
185 static ieee80211_tx_result debug_noinline
186 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
188 struct ieee80211_local *local = tx->local;
189 struct ieee80211_if_managed *ifmgd;
191 /* driver doesn't support power save */
192 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
195 /* hardware does dynamic power save */
196 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
199 /* dynamic power save disabled */
200 if (local->hw.conf.dynamic_ps_timeout <= 0)
203 /* we are scanning, don't enable power save */
207 if (!local->ps_sdata)
210 /* No point if we're going to suspend */
211 if (local->quiescing)
214 /* dynamic ps is supported only in managed mode */
215 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
218 ifmgd = &tx->sdata->u.mgd;
221 * Don't wakeup from power save if u-apsd is enabled, voip ac has
222 * u-apsd enabled and the frame is in voip class. This effectively
223 * means that even if all access categories have u-apsd enabled, in
224 * practise u-apsd is only used with the voip ac. This is a
225 * workaround for the case when received voip class packets do not
226 * have correct qos tag for some reason, due the network or the
229 * Note: ifmgd->uapsd_queues access is racy here. If the value is
230 * changed via debugfs, user needs to reassociate manually to have
231 * everything in sync.
233 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
234 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
235 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
238 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
239 ieee80211_stop_queues_by_reason(&local->hw,
240 IEEE80211_MAX_QUEUE_MAP,
241 IEEE80211_QUEUE_STOP_REASON_PS);
242 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
243 ieee80211_queue_work(&local->hw,
244 &local->dynamic_ps_disable_work);
247 /* Don't restart the timer if we're not disassociated */
248 if (!ifmgd->associated)
251 mod_timer(&local->dynamic_ps_timer, jiffies +
252 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
257 static ieee80211_tx_result debug_noinline
258 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
261 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
262 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
265 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
268 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
269 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
270 !ieee80211_is_probe_req(hdr->frame_control) &&
271 !ieee80211_is_nullfunc(hdr->frame_control))
273 * When software scanning only nullfunc frames (to notify
274 * the sleep state to the AP) and probe requests (for the
275 * active scan) are allowed, all other frames should not be
276 * sent and we should not get here, but if we do
277 * nonetheless, drop them to avoid sending them
278 * off-channel. See the link below and
279 * ieee80211_start_scan() for more.
281 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
285 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
288 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
291 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
295 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
297 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
298 if (unlikely(!assoc &&
299 ieee80211_is_data(hdr->frame_control))) {
300 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
301 sdata_info(tx->sdata,
302 "dropped data frame to not associated station %pM\n",
305 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
308 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
309 ieee80211_is_data(hdr->frame_control) &&
310 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
312 * No associated STAs - no need to send multicast
321 /* This function is called whenever the AP is about to exceed the maximum limit
322 * of buffered frames for power saving STAs. This situation should not really
323 * happen often during normal operation, so dropping the oldest buffered packet
324 * from each queue should be OK to make some room for new frames. */
325 static void purge_old_ps_buffers(struct ieee80211_local *local)
327 int total = 0, purged = 0;
329 struct ieee80211_sub_if_data *sdata;
330 struct sta_info *sta;
332 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
335 if (sdata->vif.type == NL80211_IFTYPE_AP)
336 ps = &sdata->u.ap.ps;
337 else if (ieee80211_vif_is_mesh(&sdata->vif))
338 ps = &sdata->u.mesh.ps;
342 skb = skb_dequeue(&ps->bc_buf);
347 total += skb_queue_len(&ps->bc_buf);
351 * Drop one frame from each station from the lowest-priority
352 * AC that has frames at all.
354 list_for_each_entry_rcu(sta, &local->sta_list, list) {
357 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
358 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
359 total += skb_queue_len(&sta->ps_tx_buf[ac]);
362 ieee80211_free_txskb(&local->hw, skb);
368 local->total_ps_buffered = total;
369 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
372 static ieee80211_tx_result
373 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
375 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
376 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
380 * broadcast/multicast frame
382 * If any of the associated/peer stations is in power save mode,
383 * the frame is buffered to be sent after DTIM beacon frame.
384 * This is done either by the hardware or us.
387 /* powersaving STAs currently only in AP/VLAN/mesh mode */
388 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
389 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
393 ps = &tx->sdata->bss->ps;
394 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
395 ps = &tx->sdata->u.mesh.ps;
401 /* no buffering for ordered frames */
402 if (ieee80211_has_order(hdr->frame_control))
405 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
406 info->hw_queue = tx->sdata->vif.cab_queue;
408 /* no stations in PS mode */
409 if (!atomic_read(&ps->num_sta_ps))
412 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
414 /* device releases frame after DTIM beacon */
415 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
418 /* buffered in mac80211 */
419 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
420 purge_old_ps_buffers(tx->local);
422 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
424 "BC TX buffer full - dropping the oldest frame\n");
425 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
427 tx->local->total_ps_buffered++;
429 skb_queue_tail(&ps->bc_buf, tx->skb);
434 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
437 if (!ieee80211_is_mgmt(fc))
440 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
443 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
450 static ieee80211_tx_result
451 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
453 struct sta_info *sta = tx->sta;
454 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
455 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
456 struct ieee80211_local *local = tx->local;
461 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
462 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
463 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
464 int ac = skb_get_queue_mapping(tx->skb);
466 /* only deauth, disassoc and action are bufferable MMPDUs */
467 if (ieee80211_is_mgmt(hdr->frame_control) &&
468 !ieee80211_is_deauth(hdr->frame_control) &&
469 !ieee80211_is_disassoc(hdr->frame_control) &&
470 !ieee80211_is_action(hdr->frame_control)) {
471 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
475 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
476 sta->sta.addr, sta->sta.aid, ac);
477 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
478 purge_old_ps_buffers(tx->local);
479 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
480 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
482 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
484 ieee80211_free_txskb(&local->hw, old);
486 tx->local->total_ps_buffered++;
488 info->control.jiffies = jiffies;
489 info->control.vif = &tx->sdata->vif;
490 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
491 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
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 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
520 if (tx->flags & IEEE80211_TX_UNICAST)
521 return ieee80211_tx_h_unicast_ps_buf(tx);
523 return ieee80211_tx_h_multicast_ps_buf(tx);
526 static ieee80211_tx_result debug_noinline
527 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
529 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
531 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
532 tx->sdata->control_port_no_encrypt))
533 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
538 static ieee80211_tx_result debug_noinline
539 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
541 struct ieee80211_key *key;
542 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
543 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
545 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
547 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
549 else if (ieee80211_is_mgmt(hdr->frame_control) &&
550 is_multicast_ether_addr(hdr->addr1) &&
551 ieee80211_is_robust_mgmt_frame(hdr) &&
552 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
554 else if (is_multicast_ether_addr(hdr->addr1) &&
555 (key = rcu_dereference(tx->sdata->default_multicast_key)))
557 else if (!is_multicast_ether_addr(hdr->addr1) &&
558 (key = rcu_dereference(tx->sdata->default_unicast_key)))
560 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
562 else if (!tx->sdata->drop_unencrypted)
564 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
566 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
567 !(ieee80211_is_action(hdr->frame_control) &&
568 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
570 else if (ieee80211_is_mgmt(hdr->frame_control) &&
571 !ieee80211_is_robust_mgmt_frame(hdr))
574 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
579 bool skip_hw = false;
581 tx->key->tx_rx_count++;
582 /* TODO: add threshold stuff again */
584 switch (tx->key->conf.cipher) {
585 case WLAN_CIPHER_SUITE_WEP40:
586 case WLAN_CIPHER_SUITE_WEP104:
587 case WLAN_CIPHER_SUITE_TKIP:
588 if (!ieee80211_is_data_present(hdr->frame_control))
591 case WLAN_CIPHER_SUITE_CCMP:
592 if (!ieee80211_is_data_present(hdr->frame_control) &&
593 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
597 skip_hw = (tx->key->conf.flags &
598 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
599 ieee80211_is_mgmt(hdr->frame_control);
601 case WLAN_CIPHER_SUITE_AES_CMAC:
602 if (!ieee80211_is_mgmt(hdr->frame_control))
607 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
608 !ieee80211_is_deauth(hdr->frame_control)))
611 if (!skip_hw && tx->key &&
612 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
613 info->control.hw_key = &tx->key->conf;
619 static ieee80211_tx_result debug_noinline
620 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
622 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
623 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
624 struct ieee80211_supported_band *sband;
626 struct ieee80211_tx_rate_control txrc;
627 struct ieee80211_sta_rates *ratetbl = NULL;
630 memset(&txrc, 0, sizeof(txrc));
632 sband = tx->local->hw.wiphy->bands[info->band];
634 len = min_t(u32, tx->skb->len + FCS_LEN,
635 tx->local->hw.wiphy->frag_threshold);
637 /* set up the tx rate control struct we give the RC algo */
638 txrc.hw = &tx->local->hw;
640 txrc.bss_conf = &tx->sdata->vif.bss_conf;
642 txrc.reported_rate.idx = -1;
643 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
644 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
645 txrc.max_rate_idx = -1;
647 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
649 if (tx->sdata->rc_has_mcs_mask[info->band])
650 txrc.rate_idx_mcs_mask =
651 tx->sdata->rc_rateidx_mcs_mask[info->band];
653 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
654 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
655 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
657 /* set up RTS protection if desired */
658 if (len > tx->local->hw.wiphy->rts_threshold) {
662 info->control.use_rts = txrc.rts;
663 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
666 * Use short preamble if the BSS can handle it, but not for
667 * management frames unless we know the receiver can handle
668 * that -- the management frame might be to a station that
669 * just wants a probe response.
671 if (tx->sdata->vif.bss_conf.use_short_preamble &&
672 (ieee80211_is_data(hdr->frame_control) ||
673 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
674 txrc.short_preamble = true;
676 info->control.short_preamble = txrc.short_preamble;
679 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
682 * Lets not bother rate control if we're associated and cannot
683 * talk to the sta. This should not happen.
685 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
686 !rate_usable_index_exists(sband, &tx->sta->sta),
687 "%s: Dropped data frame as no usable bitrate found while "
688 "scanning and associated. Target station: "
689 "%pM on %d GHz band\n",
690 tx->sdata->name, hdr->addr1,
695 * If we're associated with the sta at this point we know we can at
696 * least send the frame at the lowest bit rate.
698 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
700 if (tx->sta && !info->control.skip_table)
701 ratetbl = rcu_dereference(tx->sta->sta.rates);
703 if (unlikely(info->control.rates[0].idx < 0)) {
705 struct ieee80211_tx_rate rate = {
706 .idx = ratetbl->rate[0].idx,
707 .flags = ratetbl->rate[0].flags,
708 .count = ratetbl->rate[0].count
711 if (ratetbl->rate[0].idx < 0)
719 tx->rate = info->control.rates[0];
722 if (txrc.reported_rate.idx < 0) {
723 txrc.reported_rate = tx->rate;
724 if (tx->sta && ieee80211_is_data(hdr->frame_control))
725 tx->sta->last_tx_rate = txrc.reported_rate;
727 tx->sta->last_tx_rate = txrc.reported_rate;
732 if (unlikely(!info->control.rates[0].count))
733 info->control.rates[0].count = 1;
735 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
736 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
737 info->control.rates[0].count = 1;
742 static ieee80211_tx_result debug_noinline
743 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
745 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
752 * Packet injection may want to control the sequence
753 * number, if we have no matching interface then we
754 * neither assign one ourselves nor ask the driver to.
756 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
759 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
762 if (ieee80211_hdrlen(hdr->frame_control) < 24)
765 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
769 * Anything but QoS data that has a sequence number field
770 * (is long enough) gets a sequence number from the global
773 if (!ieee80211_is_data_qos(hdr->frame_control)) {
774 /* driver should assign sequence number */
775 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
776 /* for pure STA mode without beacons, we can do it */
777 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
778 tx->sdata->sequence_number += 0x10;
783 * This should be true for injected/management frames only, for
784 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
785 * above since they are not QoS-data frames.
790 /* include per-STA, per-TID sequence counter */
792 qc = ieee80211_get_qos_ctl(hdr);
793 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
794 seq = &tx->sta->tid_seq[tid];
796 hdr->seq_ctrl = cpu_to_le16(*seq);
798 /* Increase the sequence number. */
799 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
804 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
805 struct sk_buff *skb, int hdrlen,
808 struct ieee80211_local *local = tx->local;
809 struct ieee80211_tx_info *info;
811 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
812 int pos = hdrlen + per_fragm;
813 int rem = skb->len - hdrlen - per_fragm;
815 if (WARN_ON(rem < 0))
818 /* first fragment was already added to queue by caller */
821 int fraglen = per_fragm;
826 tmp = dev_alloc_skb(local->tx_headroom +
828 IEEE80211_ENCRYPT_HEADROOM +
829 IEEE80211_ENCRYPT_TAILROOM);
833 __skb_queue_tail(&tx->skbs, tmp);
835 skb_reserve(tmp, local->tx_headroom +
836 IEEE80211_ENCRYPT_HEADROOM);
837 /* copy control information */
838 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
840 info = IEEE80211_SKB_CB(tmp);
841 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
842 IEEE80211_TX_CTL_FIRST_FRAGMENT);
845 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
847 skb_copy_queue_mapping(tmp, skb);
848 tmp->priority = skb->priority;
851 /* copy header and data */
852 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
853 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
858 /* adjust first fragment's length */
859 skb->len = hdrlen + per_fragm;
863 static ieee80211_tx_result debug_noinline
864 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
866 struct sk_buff *skb = tx->skb;
867 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
868 struct ieee80211_hdr *hdr = (void *)skb->data;
869 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
873 /* no matter what happens, tx->skb moves to tx->skbs */
874 __skb_queue_tail(&tx->skbs, skb);
877 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
880 if (tx->local->ops->set_frag_threshold)
884 * Warn when submitting a fragmented A-MPDU frame and drop it.
885 * This scenario is handled in ieee80211_tx_prepare but extra
886 * caution taken here as fragmented ampdu may cause Tx stop.
888 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
891 hdrlen = ieee80211_hdrlen(hdr->frame_control);
893 /* internal error, why isn't DONTFRAG set? */
894 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
898 * Now fragment the frame. This will allocate all the fragments and
899 * chain them (using skb as the first fragment) to skb->next.
900 * During transmission, we will remove the successfully transmitted
901 * fragments from this list. When the low-level driver rejects one
902 * of the fragments then we will simply pretend to accept the skb
903 * but store it away as pending.
905 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
908 /* update duration/seq/flags of fragments */
911 skb_queue_walk(&tx->skbs, skb) {
912 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
914 hdr = (void *)skb->data;
915 info = IEEE80211_SKB_CB(skb);
917 if (!skb_queue_is_last(&tx->skbs, skb)) {
918 hdr->frame_control |= morefrags;
920 * No multi-rate retries for fragmented frames, that
921 * would completely throw off the NAV at other STAs.
923 info->control.rates[1].idx = -1;
924 info->control.rates[2].idx = -1;
925 info->control.rates[3].idx = -1;
926 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
927 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
929 hdr->frame_control &= ~morefrags;
931 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
938 static ieee80211_tx_result debug_noinline
939 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
947 skb_queue_walk(&tx->skbs, skb) {
948 ac = skb_get_queue_mapping(skb);
949 tx->sta->tx_fragments++;
950 tx->sta->tx_bytes[ac] += skb->len;
953 tx->sta->tx_packets[ac]++;
958 static ieee80211_tx_result debug_noinline
959 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
964 switch (tx->key->conf.cipher) {
965 case WLAN_CIPHER_SUITE_WEP40:
966 case WLAN_CIPHER_SUITE_WEP104:
967 return ieee80211_crypto_wep_encrypt(tx);
968 case WLAN_CIPHER_SUITE_TKIP:
969 return ieee80211_crypto_tkip_encrypt(tx);
970 case WLAN_CIPHER_SUITE_CCMP:
971 return ieee80211_crypto_ccmp_encrypt(tx);
972 case WLAN_CIPHER_SUITE_AES_CMAC:
973 return ieee80211_crypto_aes_cmac_encrypt(tx);
975 return ieee80211_crypto_hw_encrypt(tx);
981 static ieee80211_tx_result debug_noinline
982 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
985 struct ieee80211_hdr *hdr;
989 skb_queue_walk(&tx->skbs, skb) {
990 hdr = (void *) skb->data;
991 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
992 break; /* must not overwrite AID */
993 if (!skb_queue_is_last(&tx->skbs, skb)) {
994 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
995 next_len = next->len;
998 group_addr = is_multicast_ether_addr(hdr->addr1);
1001 ieee80211_duration(tx, skb, group_addr, next_len);
1007 /* actual transmit path */
1009 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1010 struct sk_buff *skb,
1011 struct ieee80211_tx_info *info,
1012 struct tid_ampdu_tx *tid_tx,
1015 bool queued = false;
1016 bool reset_agg_timer = false;
1017 struct sk_buff *purge_skb = NULL;
1019 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1020 info->flags |= IEEE80211_TX_CTL_AMPDU;
1021 reset_agg_timer = true;
1022 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1024 * nothing -- this aggregation session is being started
1025 * but that might still fail with the driver
1028 spin_lock(&tx->sta->lock);
1030 * Need to re-check now, because we may get here
1032 * 1) in the window during which the setup is actually
1033 * already done, but not marked yet because not all
1034 * packets are spliced over to the driver pending
1035 * queue yet -- if this happened we acquire the lock
1036 * either before or after the splice happens, but
1037 * need to recheck which of these cases happened.
1039 * 2) during session teardown, if the OPERATIONAL bit
1040 * was cleared due to the teardown but the pointer
1041 * hasn't been assigned NULL yet (or we loaded it
1042 * before it was assigned) -- in this case it may
1043 * now be NULL which means we should just let the
1044 * packet pass through because splicing the frames
1045 * back is already done.
1047 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1050 /* do nothing, let packet pass through */
1051 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1052 info->flags |= IEEE80211_TX_CTL_AMPDU;
1053 reset_agg_timer = true;
1056 info->control.vif = &tx->sdata->vif;
1057 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1058 __skb_queue_tail(&tid_tx->pending, skb);
1059 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1060 purge_skb = __skb_dequeue(&tid_tx->pending);
1062 spin_unlock(&tx->sta->lock);
1065 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1068 /* reset session timer */
1069 if (reset_agg_timer && tid_tx->timeout)
1070 tid_tx->last_tx = jiffies;
1078 static ieee80211_tx_result
1079 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1080 struct ieee80211_tx_data *tx,
1081 struct sk_buff *skb)
1083 struct ieee80211_local *local = sdata->local;
1084 struct ieee80211_hdr *hdr;
1085 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1089 memset(tx, 0, sizeof(*tx));
1093 __skb_queue_head_init(&tx->skbs);
1096 * If this flag is set to true anywhere, and we get here,
1097 * we are doing the needed processing, so remove the flag
1100 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1102 hdr = (struct ieee80211_hdr *) skb->data;
1104 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1105 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1106 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1108 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1109 tx->sdata->control_port_protocol == tx->skb->protocol) {
1110 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1113 tx->sta = sta_info_get(sdata, hdr->addr1);
1115 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1116 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1117 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1118 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1119 struct tid_ampdu_tx *tid_tx;
1121 qc = ieee80211_get_qos_ctl(hdr);
1122 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1124 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1128 queued = ieee80211_tx_prep_agg(tx, skb, info,
1131 if (unlikely(queued))
1136 if (is_multicast_ether_addr(hdr->addr1)) {
1137 tx->flags &= ~IEEE80211_TX_UNICAST;
1138 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1140 tx->flags |= IEEE80211_TX_UNICAST;
1142 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1143 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1144 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1145 info->flags & IEEE80211_TX_CTL_AMPDU)
1146 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1150 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1151 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1152 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1154 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1159 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1160 struct ieee80211_vif *vif,
1161 struct ieee80211_sta *sta,
1162 struct sk_buff_head *skbs,
1165 struct ieee80211_tx_control control;
1166 struct sk_buff *skb, *tmp;
1167 unsigned long flags;
1169 skb_queue_walk_safe(skbs, skb, tmp) {
1170 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1171 int q = info->hw_queue;
1173 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1174 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1175 __skb_unlink(skb, skbs);
1176 ieee80211_free_txskb(&local->hw, skb);
1181 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1182 if (local->queue_stop_reasons[q] ||
1183 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1184 if (unlikely(info->flags &
1185 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1186 if (local->queue_stop_reasons[q] &
1187 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1189 * Drop off-channel frames if queues
1190 * are stopped for any reason other
1191 * than off-channel operation. Never
1194 spin_unlock_irqrestore(
1195 &local->queue_stop_reason_lock,
1197 ieee80211_purge_tx_queue(&local->hw,
1204 * Since queue is stopped, queue up frames for
1205 * later transmission from the tx-pending
1206 * tasklet when the queue is woken again.
1209 skb_queue_splice_init(skbs,
1210 &local->pending[q]);
1212 skb_queue_splice_tail_init(skbs,
1213 &local->pending[q]);
1215 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1220 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1222 info->control.vif = vif;
1225 __skb_unlink(skb, skbs);
1226 drv_tx(local, &control, skb);
1233 * Returns false if the frame couldn't be transmitted but was queued instead.
1235 static bool __ieee80211_tx(struct ieee80211_local *local,
1236 struct sk_buff_head *skbs, int led_len,
1237 struct sta_info *sta, bool txpending)
1239 struct ieee80211_tx_info *info;
1240 struct ieee80211_sub_if_data *sdata;
1241 struct ieee80211_vif *vif;
1242 struct ieee80211_sta *pubsta;
1243 struct sk_buff *skb;
1247 if (WARN_ON(skb_queue_empty(skbs)))
1250 skb = skb_peek(skbs);
1251 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1252 info = IEEE80211_SKB_CB(skb);
1253 sdata = vif_to_sdata(info->control.vif);
1254 if (sta && !sta->uploaded)
1262 switch (sdata->vif.type) {
1263 case NL80211_IFTYPE_MONITOR:
1264 sdata = rcu_dereference(local->monitor_sdata);
1268 vif->hw_queue[skb_get_queue_mapping(skb)];
1269 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1275 case NL80211_IFTYPE_AP_VLAN:
1276 sdata = container_of(sdata->bss,
1277 struct ieee80211_sub_if_data, u.ap);
1284 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1287 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1288 ieee80211_led_tx(local, 1);
1290 WARN_ON_ONCE(!skb_queue_empty(skbs));
1296 * Invoke TX handlers, return 0 on success and non-zero if the
1297 * frame was dropped or queued.
1299 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1301 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1302 ieee80211_tx_result res = TX_DROP;
1304 #define CALL_TXH(txh) \
1307 if (res != TX_CONTINUE) \
1311 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1312 CALL_TXH(ieee80211_tx_h_check_assoc);
1313 CALL_TXH(ieee80211_tx_h_ps_buf);
1314 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1315 CALL_TXH(ieee80211_tx_h_select_key);
1316 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1317 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1319 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1320 __skb_queue_tail(&tx->skbs, tx->skb);
1325 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1326 CALL_TXH(ieee80211_tx_h_sequence);
1327 CALL_TXH(ieee80211_tx_h_fragment);
1328 /* handlers after fragment must be aware of tx info fragmentation! */
1329 CALL_TXH(ieee80211_tx_h_stats);
1330 CALL_TXH(ieee80211_tx_h_encrypt);
1331 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1332 CALL_TXH(ieee80211_tx_h_calculate_duration);
1336 if (unlikely(res == TX_DROP)) {
1337 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1339 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1341 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1343 } else if (unlikely(res == TX_QUEUED)) {
1344 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1352 * Returns false if the frame couldn't be transmitted but was queued instead.
1354 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1355 struct sk_buff *skb, bool txpending,
1356 enum ieee80211_band band)
1358 struct ieee80211_local *local = sdata->local;
1359 struct ieee80211_tx_data tx;
1360 ieee80211_tx_result res_prepare;
1361 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1365 if (unlikely(skb->len < 10)) {
1370 /* initialises tx */
1372 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1374 if (unlikely(res_prepare == TX_DROP)) {
1375 ieee80211_free_txskb(&local->hw, skb);
1377 } else if (unlikely(res_prepare == TX_QUEUED)) {
1383 /* set up hw_queue value early */
1384 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1385 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1387 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1389 if (!invoke_tx_handlers(&tx))
1390 result = __ieee80211_tx(local, &tx.skbs, led_len,
1396 /* device xmit handlers */
1398 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1399 struct sk_buff *skb,
1400 int head_need, bool may_encrypt)
1402 struct ieee80211_local *local = sdata->local;
1405 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1406 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1407 tail_need -= skb_tailroom(skb);
1408 tail_need = max_t(int, tail_need, 0);
1411 if (skb_cloned(skb))
1412 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1413 else if (head_need || tail_need)
1414 I802_DEBUG_INC(local->tx_expand_skb_head);
1418 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1419 wiphy_debug(local->hw.wiphy,
1420 "failed to reallocate TX buffer\n");
1427 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1428 enum ieee80211_band band)
1430 struct ieee80211_local *local = sdata->local;
1431 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1432 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1436 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1438 headroom = local->tx_headroom;
1440 headroom += IEEE80211_ENCRYPT_HEADROOM;
1441 headroom -= skb_headroom(skb);
1442 headroom = max_t(int, 0, headroom);
1444 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1445 ieee80211_free_txskb(&local->hw, skb);
1449 hdr = (struct ieee80211_hdr *) skb->data;
1450 info->control.vif = &sdata->vif;
1452 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1453 if (ieee80211_is_data(hdr->frame_control) &&
1454 is_unicast_ether_addr(hdr->addr1)) {
1455 if (mesh_nexthop_resolve(sdata, skb))
1456 return; /* skb queued: don't free */
1458 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1462 ieee80211_set_qos_hdr(sdata, skb);
1463 ieee80211_tx(sdata, skb, false, band);
1466 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1468 struct ieee80211_radiotap_iterator iterator;
1469 struct ieee80211_radiotap_header *rthdr =
1470 (struct ieee80211_radiotap_header *) skb->data;
1471 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1472 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1476 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1477 IEEE80211_TX_CTL_DONTFRAG;
1480 * for every radiotap entry that is present
1481 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1482 * entries present, or -EINVAL on error)
1486 ret = ieee80211_radiotap_iterator_next(&iterator);
1491 /* see if this argument is something we can use */
1492 switch (iterator.this_arg_index) {
1494 * You must take care when dereferencing iterator.this_arg
1495 * for multibyte types... the pointer is not aligned. Use
1496 * get_unaligned((type *)iterator.this_arg) to dereference
1497 * iterator.this_arg for type "type" safely on all arches.
1499 case IEEE80211_RADIOTAP_FLAGS:
1500 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1502 * this indicates that the skb we have been
1503 * handed has the 32-bit FCS CRC at the end...
1504 * we should react to that by snipping it off
1505 * because it will be recomputed and added
1508 if (skb->len < (iterator._max_length + FCS_LEN))
1511 skb_trim(skb, skb->len - FCS_LEN);
1513 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1514 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1515 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1516 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1519 case IEEE80211_RADIOTAP_TX_FLAGS:
1520 txflags = get_unaligned_le16(iterator.this_arg);
1521 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1522 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1526 * Please update the file
1527 * Documentation/networking/mac80211-injection.txt
1528 * when parsing new fields here.
1536 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1540 * remove the radiotap header
1541 * iterator->_max_length was sanity-checked against
1542 * skb->len by iterator init
1544 skb_pull(skb, iterator._max_length);
1549 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1550 struct net_device *dev)
1552 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1553 struct ieee80211_chanctx_conf *chanctx_conf;
1554 struct ieee80211_channel *chan;
1555 struct ieee80211_radiotap_header *prthdr =
1556 (struct ieee80211_radiotap_header *)skb->data;
1557 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1558 struct ieee80211_hdr *hdr;
1559 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1563 /* check for not even having the fixed radiotap header part */
1564 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1565 goto fail; /* too short to be possibly valid */
1567 /* is it a header version we can trust to find length from? */
1568 if (unlikely(prthdr->it_version))
1569 goto fail; /* only version 0 is supported */
1571 /* then there must be a radiotap header with a length we can use */
1572 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1574 /* does the skb contain enough to deliver on the alleged length? */
1575 if (unlikely(skb->len < len_rthdr))
1576 goto fail; /* skb too short for claimed rt header extent */
1579 * fix up the pointers accounting for the radiotap
1580 * header still being in there. We are being given
1581 * a precooked IEEE80211 header so no need for
1584 skb_set_mac_header(skb, len_rthdr);
1586 * these are just fixed to the end of the rt area since we
1587 * don't have any better information and at this point, nobody cares
1589 skb_set_network_header(skb, len_rthdr);
1590 skb_set_transport_header(skb, len_rthdr);
1592 if (skb->len < len_rthdr + 2)
1595 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1596 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1598 if (skb->len < len_rthdr + hdrlen)
1602 * Initialize skb->protocol if the injected frame is a data frame
1603 * carrying a rfc1042 header
1605 if (ieee80211_is_data(hdr->frame_control) &&
1606 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1607 u8 *payload = (u8 *)hdr + hdrlen;
1609 if (ether_addr_equal(payload, rfc1042_header))
1610 skb->protocol = cpu_to_be16((payload[6] << 8) |
1614 memset(info, 0, sizeof(*info));
1616 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1617 IEEE80211_TX_CTL_INJECTED;
1619 /* process and remove the injection radiotap header */
1620 if (!ieee80211_parse_tx_radiotap(skb))
1626 * We process outgoing injected frames that have a local address
1627 * we handle as though they are non-injected frames.
1628 * This code here isn't entirely correct, the local MAC address
1629 * isn't always enough to find the interface to use; for proper
1630 * VLAN/WDS support we will need a different mechanism (which
1631 * likely isn't going to be monitor interfaces).
1633 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1635 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1636 if (!ieee80211_sdata_running(tmp_sdata))
1638 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1639 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1640 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1642 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1648 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1649 if (!chanctx_conf) {
1650 tmp_sdata = rcu_dereference(local->monitor_sdata);
1653 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1657 chan = chanctx_conf->def.chan;
1658 else if (!local->use_chanctx)
1659 chan = local->_oper_chandef.chan;
1664 * Frame injection is not allowed if beaconing is not allowed
1665 * or if we need radar detection. Beaconing is usually not allowed when
1666 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1667 * Passive scan is also used in world regulatory domains where
1668 * your country is not known and as such it should be treated as
1669 * NO TX unless the channel is explicitly allowed in which case
1670 * your current regulatory domain would not have the passive scan
1673 * Since AP mode uses monitor interfaces to inject/TX management
1674 * frames we can make AP mode the exception to this rule once it
1675 * supports radar detection as its implementation can deal with
1676 * radar detection by itself. We can do that later by adding a
1677 * monitor flag interfaces used for AP support.
1679 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1680 IEEE80211_CHAN_PASSIVE_SCAN)))
1683 ieee80211_xmit(sdata, skb, chan->band);
1686 return NETDEV_TX_OK;
1692 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1696 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1697 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1698 * @skb: packet to be sent
1699 * @dev: incoming interface
1701 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1702 * not be freed, and caller is responsible for either retrying later or freeing
1705 * This function takes in an Ethernet header and encapsulates it with suitable
1706 * IEEE 802.11 header based on which interface the packet is coming in. The
1707 * encapsulated packet will then be passed to master interface, wlan#.11, for
1708 * transmission (through low-level driver).
1710 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1711 struct net_device *dev)
1713 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1714 struct ieee80211_local *local = sdata->local;
1715 struct ieee80211_tx_info *info;
1717 u16 ethertype, hdrlen, meshhdrlen = 0;
1719 struct ieee80211_hdr hdr;
1720 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1721 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1722 const u8 *encaps_data;
1723 int encaps_len, skip_header_bytes;
1725 struct sta_info *sta = NULL;
1726 bool wme_sta = false, authorized = false, tdls_auth = false;
1727 bool tdls_direct = false;
1731 struct ieee80211_chanctx_conf *chanctx_conf;
1732 struct ieee80211_sub_if_data *ap_sdata;
1733 enum ieee80211_band band;
1735 if (unlikely(skb->len < ETH_HLEN))
1738 /* convert Ethernet header to proper 802.11 header (based on
1739 * operation mode) */
1740 ethertype = (skb->data[12] << 8) | skb->data[13];
1741 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1745 switch (sdata->vif.type) {
1746 case NL80211_IFTYPE_AP_VLAN:
1747 sta = rcu_dereference(sdata->u.vlan.sta);
1749 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1751 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1752 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1753 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1754 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1756 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1757 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1759 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1761 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1764 band = chanctx_conf->def.chan->band;
1768 case NL80211_IFTYPE_AP:
1769 if (sdata->vif.type == NL80211_IFTYPE_AP)
1770 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1773 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1775 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1776 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1777 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1779 band = chanctx_conf->def.chan->band;
1781 case NL80211_IFTYPE_WDS:
1782 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1784 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1785 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1786 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1787 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1790 * This is the exception! WDS style interfaces are prohibited
1791 * when channel contexts are in used so this must be valid
1793 band = local->hw.conf.chandef.chan->band;
1795 #ifdef CONFIG_MAC80211_MESH
1796 case NL80211_IFTYPE_MESH_POINT:
1797 if (!is_multicast_ether_addr(skb->data)) {
1798 struct sta_info *next_hop;
1799 bool mpp_lookup = true;
1801 mpath = mesh_path_lookup(sdata, skb->data);
1804 next_hop = rcu_dereference(mpath->next_hop);
1806 !(mpath->flags & (MESH_PATH_ACTIVE |
1807 MESH_PATH_RESOLVING)))
1812 mppath = mpp_path_lookup(sdata, skb->data);
1814 if (mppath && mpath)
1815 mesh_path_del(mpath->sdata, mpath->dst);
1819 * Use address extension if it is a packet from
1820 * another interface or if we know the destination
1821 * is being proxied by a portal (i.e. portal address
1822 * differs from proxied address)
1824 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1825 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1826 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1827 skb->data, skb->data + ETH_ALEN);
1828 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1831 /* DS -> MBSS (802.11-2012 13.11.3.3).
1832 * For unicast with unknown forwarding information,
1833 * destination might be in the MBSS or if that fails
1834 * forwarded to another mesh gate. In either case
1835 * resolution will be handled in ieee80211_xmit(), so
1836 * leave the original DA. This also works for mcast */
1837 const u8 *mesh_da = skb->data;
1840 mesh_da = mppath->mpp;
1842 mesh_da = mpath->dst;
1844 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1845 mesh_da, sdata->vif.addr);
1846 if (is_multicast_ether_addr(mesh_da))
1847 /* DA TA mSA AE:SA */
1848 meshhdrlen = ieee80211_new_mesh_header(
1850 skb->data + ETH_ALEN, NULL);
1852 /* RA TA mDA mSA AE:DA SA */
1853 meshhdrlen = ieee80211_new_mesh_header(
1854 sdata, &mesh_hdr, skb->data,
1855 skb->data + ETH_ALEN);
1858 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1861 band = chanctx_conf->def.chan->band;
1864 case NL80211_IFTYPE_STATION:
1865 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1866 bool tdls_peer = false;
1868 sta = sta_info_get(sdata, skb->data);
1870 authorized = test_sta_flag(sta,
1871 WLAN_STA_AUTHORIZED);
1872 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1873 tdls_peer = test_sta_flag(sta,
1874 WLAN_STA_TDLS_PEER);
1875 tdls_auth = test_sta_flag(sta,
1876 WLAN_STA_TDLS_PEER_AUTH);
1880 * If the TDLS link is enabled, send everything
1881 * directly. Otherwise, allow TDLS setup frames
1882 * to be transmitted indirectly.
1884 tdls_direct = tdls_peer && (tdls_auth ||
1885 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1886 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1890 /* link during setup - throw out frames to peer */
1895 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1896 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1897 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1899 } else if (sdata->u.mgd.use_4addr &&
1900 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1901 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1902 IEEE80211_FCTL_TODS);
1904 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1905 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1906 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1907 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1910 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1912 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1913 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1914 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1917 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1920 band = chanctx_conf->def.chan->band;
1922 case NL80211_IFTYPE_ADHOC:
1924 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1925 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1926 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1928 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1931 band = chanctx_conf->def.chan->band;
1938 * There's no need to try to look up the destination
1939 * if it is a multicast address (which can only happen
1942 multicast = is_multicast_ether_addr(hdr.addr1);
1944 sta = sta_info_get(sdata, hdr.addr1);
1946 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1947 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1951 /* For mesh, the use of the QoS header is mandatory */
1952 if (ieee80211_vif_is_mesh(&sdata->vif))
1955 /* receiver and we are QoS enabled, use a QoS type frame */
1956 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1957 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1962 * Drop unicast frames to unauthorised stations unless they are
1963 * EAPOL frames from the local station.
1965 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1966 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1967 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1968 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1969 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1970 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1971 dev->name, hdr.addr1);
1974 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1979 if (unlikely(!multicast && skb->sk &&
1980 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1981 struct sk_buff *orig_skb = skb;
1983 skb = skb_clone(skb, GFP_ATOMIC);
1985 unsigned long flags;
1988 spin_lock_irqsave(&local->ack_status_lock, flags);
1989 id = idr_alloc(&local->ack_status_frames, orig_skb,
1990 1, 0x10000, GFP_ATOMIC);
1991 spin_unlock_irqrestore(&local->ack_status_lock, flags);
1995 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1996 } else if (skb_shared(skb)) {
1997 kfree_skb(orig_skb);
2003 /* couldn't clone -- lose tx status ... */
2009 * If the skb is shared we need to obtain our own copy.
2011 if (skb_shared(skb)) {
2012 struct sk_buff *tmp_skb = skb;
2014 /* can't happen -- skb is a clone if info_id != 0 */
2017 skb = skb_clone(skb, GFP_ATOMIC);
2024 hdr.frame_control = fc;
2025 hdr.duration_id = 0;
2028 skip_header_bytes = ETH_HLEN;
2029 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2030 encaps_data = bridge_tunnel_header;
2031 encaps_len = sizeof(bridge_tunnel_header);
2032 skip_header_bytes -= 2;
2033 } else if (ethertype >= ETH_P_802_3_MIN) {
2034 encaps_data = rfc1042_header;
2035 encaps_len = sizeof(rfc1042_header);
2036 skip_header_bytes -= 2;
2042 nh_pos = skb_network_header(skb) - skb->data;
2043 h_pos = skb_transport_header(skb) - skb->data;
2045 skb_pull(skb, skip_header_bytes);
2046 nh_pos -= skip_header_bytes;
2047 h_pos -= skip_header_bytes;
2049 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2052 * So we need to modify the skb header and hence need a copy of
2053 * that. The head_need variable above doesn't, so far, include
2054 * the needed header space that we don't need right away. If we
2055 * can, then we don't reallocate right now but only after the
2056 * frame arrives at the master device (if it does...)
2058 * If we cannot, however, then we will reallocate to include all
2059 * the ever needed space. Also, if we need to reallocate it anyway,
2060 * make it big enough for everything we may ever need.
2063 if (head_need > 0 || skb_cloned(skb)) {
2064 head_need += IEEE80211_ENCRYPT_HEADROOM;
2065 head_need += local->tx_headroom;
2066 head_need = max_t(int, 0, head_need);
2067 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2068 ieee80211_free_txskb(&local->hw, skb);
2075 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2076 nh_pos += encaps_len;
2077 h_pos += encaps_len;
2080 #ifdef CONFIG_MAC80211_MESH
2081 if (meshhdrlen > 0) {
2082 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2083 nh_pos += meshhdrlen;
2084 h_pos += meshhdrlen;
2088 if (ieee80211_is_data_qos(fc)) {
2089 __le16 *qos_control;
2091 qos_control = (__le16*) skb_push(skb, 2);
2092 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2094 * Maybe we could actually set some fields here, for now just
2095 * initialise to zero to indicate no special operation.
2099 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2104 dev->stats.tx_packets++;
2105 dev->stats.tx_bytes += skb->len;
2107 /* Update skb pointers to various headers since this modified frame
2108 * is going to go through Linux networking code that may potentially
2109 * need things like pointer to IP header. */
2110 skb_set_mac_header(skb, 0);
2111 skb_set_network_header(skb, nh_pos);
2112 skb_set_transport_header(skb, h_pos);
2114 info = IEEE80211_SKB_CB(skb);
2115 memset(info, 0, sizeof(*info));
2117 dev->trans_start = jiffies;
2119 info->flags = info_flags;
2120 info->ack_frame_id = info_id;
2122 ieee80211_xmit(sdata, skb, band);
2125 return NETDEV_TX_OK;
2131 return NETDEV_TX_OK;
2136 * ieee80211_clear_tx_pending may not be called in a context where
2137 * it is possible that it packets could come in again.
2139 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2141 struct sk_buff *skb;
2144 for (i = 0; i < local->hw.queues; i++) {
2145 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2146 ieee80211_free_txskb(&local->hw, skb);
2151 * Returns false if the frame couldn't be transmitted but was queued instead,
2152 * which in this case means re-queued -- take as an indication to stop sending
2153 * more pending frames.
2155 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2156 struct sk_buff *skb)
2158 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2159 struct ieee80211_sub_if_data *sdata;
2160 struct sta_info *sta;
2161 struct ieee80211_hdr *hdr;
2163 struct ieee80211_chanctx_conf *chanctx_conf;
2165 sdata = vif_to_sdata(info->control.vif);
2167 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2168 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2169 if (unlikely(!chanctx_conf)) {
2173 result = ieee80211_tx(sdata, skb, true,
2174 chanctx_conf->def.chan->band);
2176 struct sk_buff_head skbs;
2178 __skb_queue_head_init(&skbs);
2179 __skb_queue_tail(&skbs, skb);
2181 hdr = (struct ieee80211_hdr *)skb->data;
2182 sta = sta_info_get(sdata, hdr->addr1);
2184 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2191 * Transmit all pending packets. Called from tasklet.
2193 void ieee80211_tx_pending(unsigned long data)
2195 struct ieee80211_local *local = (struct ieee80211_local *)data;
2196 unsigned long flags;
2202 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2203 for (i = 0; i < local->hw.queues; i++) {
2205 * If queue is stopped by something other than due to pending
2206 * frames, or we have no pending frames, proceed to next queue.
2208 if (local->queue_stop_reasons[i] ||
2209 skb_queue_empty(&local->pending[i]))
2212 while (!skb_queue_empty(&local->pending[i])) {
2213 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2214 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2216 if (WARN_ON(!info->control.vif)) {
2217 ieee80211_free_txskb(&local->hw, skb);
2221 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2224 txok = ieee80211_tx_pending_skb(local, skb);
2225 spin_lock_irqsave(&local->queue_stop_reason_lock,
2231 if (skb_queue_empty(&local->pending[i]))
2232 ieee80211_propagate_queue_wake(local, i);
2234 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2239 /* functions for drivers to get certain frames */
2241 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2242 struct ps_data *ps, struct sk_buff *skb)
2246 int i, have_bits = 0, n1, n2;
2248 /* Generate bitmap for TIM only if there are any STAs in power save
2250 if (atomic_read(&ps->num_sta_ps) > 0)
2251 /* in the hope that this is faster than
2252 * checking byte-for-byte */
2253 have_bits = !bitmap_empty((unsigned long*)ps->tim,
2254 IEEE80211_MAX_AID+1);
2256 if (ps->dtim_count == 0)
2257 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2261 tim = pos = (u8 *) skb_put(skb, 6);
2262 *pos++ = WLAN_EID_TIM;
2264 *pos++ = ps->dtim_count;
2265 *pos++ = sdata->vif.bss_conf.dtim_period;
2267 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2270 ps->dtim_bc_mc = aid0 == 1;
2273 /* Find largest even number N1 so that bits numbered 1 through
2274 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2275 * (N2 + 1) x 8 through 2007 are 0. */
2277 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2284 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2291 /* Bitmap control */
2293 /* Part Virt Bitmap */
2294 skb_put(skb, n2 - n1);
2295 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2297 tim[1] = n2 - n1 + 4;
2299 *pos++ = aid0; /* Bitmap control */
2300 *pos++ = 0; /* Part Virt Bitmap */
2304 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2305 struct ps_data *ps, struct sk_buff *skb)
2307 struct ieee80211_local *local = sdata->local;
2310 * Not very nice, but we want to allow the driver to call
2311 * ieee80211_beacon_get() as a response to the set_tim()
2312 * callback. That, however, is already invoked under the
2313 * sta_lock to guarantee consistent and race-free update
2314 * of the tim bitmap in mac80211 and the driver.
2316 if (local->tim_in_locked_section) {
2317 __ieee80211_beacon_add_tim(sdata, ps, skb);
2319 spin_lock_bh(&local->tim_lock);
2320 __ieee80211_beacon_add_tim(sdata, ps, skb);
2321 spin_unlock_bh(&local->tim_lock);
2327 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2328 struct ieee80211_vif *vif,
2329 u16 *tim_offset, u16 *tim_length)
2331 struct ieee80211_local *local = hw_to_local(hw);
2332 struct sk_buff *skb = NULL;
2333 struct ieee80211_tx_info *info;
2334 struct ieee80211_sub_if_data *sdata = NULL;
2335 enum ieee80211_band band;
2336 struct ieee80211_tx_rate_control txrc;
2337 struct ieee80211_chanctx_conf *chanctx_conf;
2341 sdata = vif_to_sdata(vif);
2342 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2344 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2352 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2353 struct ieee80211_if_ap *ap = &sdata->u.ap;
2354 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2358 * headroom, head length,
2359 * tail length and maximum TIM length
2361 skb = dev_alloc_skb(local->tx_headroom +
2363 beacon->tail_len + 256);
2367 skb_reserve(skb, local->tx_headroom);
2368 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2371 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2374 *tim_offset = beacon->head_len;
2376 *tim_length = skb->len - beacon->head_len;
2379 memcpy(skb_put(skb, beacon->tail_len),
2380 beacon->tail, beacon->tail_len);
2383 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2384 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2385 struct ieee80211_hdr *hdr;
2386 struct beacon_data *presp = rcu_dereference(ifibss->presp);
2391 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
2394 skb_reserve(skb, local->tx_headroom);
2395 memcpy(skb_put(skb, presp->head_len), presp->head,
2398 hdr = (struct ieee80211_hdr *) skb->data;
2399 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2400 IEEE80211_STYPE_BEACON);
2401 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2402 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2403 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
2408 if (ifmsh->sync_ops)
2409 ifmsh->sync_ops->adjust_tbtt(
2412 skb = dev_alloc_skb(local->tx_headroom +
2418 skb_reserve(skb, local->tx_headroom);
2419 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2420 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2421 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
2427 band = chanctx_conf->def.chan->band;
2429 info = IEEE80211_SKB_CB(skb);
2431 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2432 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2435 memset(&txrc, 0, sizeof(txrc));
2437 txrc.sband = local->hw.wiphy->bands[band];
2438 txrc.bss_conf = &sdata->vif.bss_conf;
2440 txrc.reported_rate.idx = -1;
2441 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2442 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2443 txrc.max_rate_idx = -1;
2445 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2447 rate_control_get_rate(sdata, NULL, &txrc);
2449 info->control.vif = vif;
2451 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2452 IEEE80211_TX_CTL_ASSIGN_SEQ |
2453 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2458 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2460 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2461 struct ieee80211_vif *vif)
2463 struct ieee80211_if_ap *ap = NULL;
2464 struct sk_buff *skb = NULL;
2465 struct probe_resp *presp = NULL;
2466 struct ieee80211_hdr *hdr;
2467 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2469 if (sdata->vif.type != NL80211_IFTYPE_AP)
2475 presp = rcu_dereference(ap->probe_resp);
2479 skb = dev_alloc_skb(presp->len);
2483 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2485 hdr = (struct ieee80211_hdr *) skb->data;
2486 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2492 EXPORT_SYMBOL(ieee80211_proberesp_get);
2494 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2495 struct ieee80211_vif *vif)
2497 struct ieee80211_sub_if_data *sdata;
2498 struct ieee80211_if_managed *ifmgd;
2499 struct ieee80211_pspoll *pspoll;
2500 struct ieee80211_local *local;
2501 struct sk_buff *skb;
2503 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2506 sdata = vif_to_sdata(vif);
2507 ifmgd = &sdata->u.mgd;
2508 local = sdata->local;
2510 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2514 skb_reserve(skb, local->hw.extra_tx_headroom);
2516 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2517 memset(pspoll, 0, sizeof(*pspoll));
2518 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2519 IEEE80211_STYPE_PSPOLL);
2520 pspoll->aid = cpu_to_le16(ifmgd->aid);
2522 /* aid in PS-Poll has its two MSBs each set to 1 */
2523 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2525 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2526 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2530 EXPORT_SYMBOL(ieee80211_pspoll_get);
2532 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2533 struct ieee80211_vif *vif)
2535 struct ieee80211_hdr_3addr *nullfunc;
2536 struct ieee80211_sub_if_data *sdata;
2537 struct ieee80211_if_managed *ifmgd;
2538 struct ieee80211_local *local;
2539 struct sk_buff *skb;
2541 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2544 sdata = vif_to_sdata(vif);
2545 ifmgd = &sdata->u.mgd;
2546 local = sdata->local;
2548 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2552 skb_reserve(skb, local->hw.extra_tx_headroom);
2554 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2556 memset(nullfunc, 0, sizeof(*nullfunc));
2557 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2558 IEEE80211_STYPE_NULLFUNC |
2559 IEEE80211_FCTL_TODS);
2560 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2561 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2562 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2566 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2568 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2569 struct ieee80211_vif *vif,
2570 const u8 *ssid, size_t ssid_len,
2573 struct ieee80211_sub_if_data *sdata;
2574 struct ieee80211_local *local;
2575 struct ieee80211_hdr_3addr *hdr;
2576 struct sk_buff *skb;
2580 sdata = vif_to_sdata(vif);
2581 local = sdata->local;
2582 ie_ssid_len = 2 + ssid_len;
2584 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2585 ie_ssid_len + tailroom);
2589 skb_reserve(skb, local->hw.extra_tx_headroom);
2591 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2592 memset(hdr, 0, sizeof(*hdr));
2593 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2594 IEEE80211_STYPE_PROBE_REQ);
2595 eth_broadcast_addr(hdr->addr1);
2596 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2597 eth_broadcast_addr(hdr->addr3);
2599 pos = skb_put(skb, ie_ssid_len);
2600 *pos++ = WLAN_EID_SSID;
2603 memcpy(pos, ssid, ssid_len);
2608 EXPORT_SYMBOL(ieee80211_probereq_get);
2610 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2611 const void *frame, size_t frame_len,
2612 const struct ieee80211_tx_info *frame_txctl,
2613 struct ieee80211_rts *rts)
2615 const struct ieee80211_hdr *hdr = frame;
2617 rts->frame_control =
2618 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2619 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2621 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2622 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2624 EXPORT_SYMBOL(ieee80211_rts_get);
2626 void ieee80211_ctstoself_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_cts *cts)
2631 const struct ieee80211_hdr *hdr = frame;
2633 cts->frame_control =
2634 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2635 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2636 frame_len, frame_txctl);
2637 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2639 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2642 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2643 struct ieee80211_vif *vif)
2645 struct ieee80211_local *local = hw_to_local(hw);
2646 struct sk_buff *skb = NULL;
2647 struct ieee80211_tx_data tx;
2648 struct ieee80211_sub_if_data *sdata;
2650 struct ieee80211_tx_info *info;
2651 struct ieee80211_chanctx_conf *chanctx_conf;
2653 sdata = vif_to_sdata(vif);
2656 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2661 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2662 struct beacon_data *beacon =
2663 rcu_dereference(sdata->u.ap.beacon);
2665 if (!beacon || !beacon->head)
2668 ps = &sdata->u.ap.ps;
2669 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2670 ps = &sdata->u.mesh.ps;
2675 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2676 goto out; /* send buffered bc/mc only after DTIM beacon */
2679 skb = skb_dequeue(&ps->bc_buf);
2682 local->total_ps_buffered--;
2684 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2685 struct ieee80211_hdr *hdr =
2686 (struct ieee80211_hdr *) skb->data;
2687 /* more buffered multicast/broadcast frames ==> set
2688 * MoreData flag in IEEE 802.11 header to inform PS
2690 hdr->frame_control |=
2691 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2694 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2695 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
2696 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2698 dev_kfree_skb_any(skb);
2701 info = IEEE80211_SKB_CB(skb);
2703 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2704 info->band = chanctx_conf->def.chan->band;
2706 if (invoke_tx_handlers(&tx))
2713 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2715 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2716 struct sk_buff *skb, int tid,
2717 enum ieee80211_band band)
2719 int ac = ieee802_1d_to_ac[tid & 7];
2721 skb_set_mac_header(skb, 0);
2722 skb_set_network_header(skb, 0);
2723 skb_set_transport_header(skb, 0);
2725 skb_set_queue_mapping(skb, ac);
2726 skb->priority = tid;
2728 skb->dev = sdata->dev;
2731 * The other path calling ieee80211_xmit is from the tasklet,
2732 * and while we can handle concurrent transmissions locking
2733 * requirements are that we do not come into tx with bhs on.
2736 ieee80211_xmit(sdata, skb, band);