2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
40 struct sk_buff *skb, int group_addr,
43 int rate, mrate, erp, dur, i;
44 struct ieee80211_rate *txrate;
45 struct ieee80211_local *local = tx->local;
46 struct ieee80211_supported_band *sband;
47 struct ieee80211_hdr *hdr;
48 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
50 /* assume HW handles this */
51 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
55 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
58 sband = local->hw.wiphy->bands[info->band];
59 txrate = &sband->bitrates[info->control.rates[0].idx];
61 erp = txrate->flags & IEEE80211_RATE_ERP_G;
64 * data and mgmt (except PS Poll):
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
80 hdr = (struct ieee80211_hdr *)skb->data;
81 if (ieee80211_is_ctl(hdr->frame_control)) {
82 /* TODO: These control frames are not currently sent by
83 * mac80211, but should they be implemented, this function
84 * needs to be updated to support duration field calculation.
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
94 * PS Poll: BIT(15) | BIT(14) | aid
100 if (0 /* FIX: data/mgmt during CFP */)
101 return cpu_to_le16(32768);
103 if (group_addr) /* Group address as the destination - no ACK */
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 /* use lowest available if everything fails */
118 mrate = sband->bitrates[0].bitrate;
119 for (i = 0; i < sband->n_bitrates; i++) {
120 struct ieee80211_rate *r = &sband->bitrates[i];
122 if (r->bitrate > txrate->bitrate)
125 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
128 switch (sband->band) {
129 case IEEE80211_BAND_2GHZ: {
131 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
132 flag = IEEE80211_RATE_MANDATORY_G;
134 flag = IEEE80211_RATE_MANDATORY_B;
139 case IEEE80211_BAND_5GHZ:
140 if (r->flags & IEEE80211_RATE_MANDATORY_A)
143 case IEEE80211_BAND_60GHZ:
144 /* TODO, for now fall through */
145 case IEEE80211_NUM_BANDS:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
157 if (ieee80211_is_data_qos(hdr->frame_control) &&
158 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
161 /* Time needed to transmit ACK
162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
163 * to closest integer */
164 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
165 tx->sdata->vif.bss_conf.use_short_preamble);
168 /* Frame is fragmented: duration increases with time needed to
169 * transmit next fragment plus ACK and 2 x SIFS. */
170 dur *= 2; /* ACK + SIFS */
172 dur += ieee80211_frame_duration(sband->band, next_frag_len,
173 txrate->bitrate, erp,
174 tx->sdata->vif.bss_conf.use_short_preamble);
177 return cpu_to_le16(dur);
181 static ieee80211_tx_result debug_noinline
182 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
184 struct ieee80211_local *local = tx->local;
185 struct ieee80211_if_managed *ifmgd;
187 /* driver doesn't support power save */
188 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
191 /* hardware does dynamic power save */
192 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
195 /* dynamic power save disabled */
196 if (local->hw.conf.dynamic_ps_timeout <= 0)
199 /* we are scanning, don't enable power save */
203 if (!local->ps_sdata)
206 /* No point if we're going to suspend */
207 if (local->quiescing)
210 /* dynamic ps is supported only in managed mode */
211 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
214 ifmgd = &tx->sdata->u.mgd;
217 * Don't wakeup from power save if u-apsd is enabled, voip ac has
218 * u-apsd enabled and the frame is in voip class. This effectively
219 * means that even if all access categories have u-apsd enabled, in
220 * practise u-apsd is only used with the voip ac. This is a
221 * workaround for the case when received voip class packets do not
222 * have correct qos tag for some reason, due the network or the
225 * Note: ifmgd->uapsd_queues access is racy here. If the value is
226 * changed via debugfs, user needs to reassociate manually to have
227 * everything in sync.
229 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
230 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
231 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
234 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
235 ieee80211_stop_queues_by_reason(&local->hw,
236 IEEE80211_QUEUE_STOP_REASON_PS);
237 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
238 ieee80211_queue_work(&local->hw,
239 &local->dynamic_ps_disable_work);
242 /* Don't restart the timer if we're not disassociated */
243 if (!ifmgd->associated)
246 mod_timer(&local->dynamic_ps_timer, jiffies +
247 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
252 static ieee80211_tx_result debug_noinline
253 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
256 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
257 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
260 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
263 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
264 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
265 !ieee80211_is_probe_req(hdr->frame_control) &&
266 !ieee80211_is_nullfunc(hdr->frame_control))
268 * When software scanning only nullfunc frames (to notify
269 * the sleep state to the AP) and probe requests (for the
270 * active scan) are allowed, all other frames should not be
271 * sent and we should not get here, but if we do
272 * nonetheless, drop them to avoid sending them
273 * off-channel. See the link below and
274 * ieee80211_start_scan() for more.
276 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
280 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
283 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
286 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
290 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
292 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
293 if (unlikely(!assoc &&
294 ieee80211_is_data(hdr->frame_control))) {
295 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
296 sdata_info(tx->sdata,
297 "dropped data frame to not associated station %pM\n",
300 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
303 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
304 ieee80211_is_data(hdr->frame_control) &&
305 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
307 * No associated STAs - no need to send multicast
316 /* This function is called whenever the AP is about to exceed the maximum limit
317 * of buffered frames for power saving STAs. This situation should not really
318 * happen often during normal operation, so dropping the oldest buffered packet
319 * from each queue should be OK to make some room for new frames. */
320 static void purge_old_ps_buffers(struct ieee80211_local *local)
322 int total = 0, purged = 0;
324 struct ieee80211_sub_if_data *sdata;
325 struct sta_info *sta;
327 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
330 if (sdata->vif.type == NL80211_IFTYPE_AP)
331 ps = &sdata->u.ap.ps;
332 else if (ieee80211_vif_is_mesh(&sdata->vif))
333 ps = &sdata->u.mesh.ps;
337 skb = skb_dequeue(&ps->bc_buf);
342 total += skb_queue_len(&ps->bc_buf);
346 * Drop one frame from each station from the lowest-priority
347 * AC that has frames at all.
349 list_for_each_entry_rcu(sta, &local->sta_list, list) {
352 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
353 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
354 total += skb_queue_len(&sta->ps_tx_buf[ac]);
357 ieee80211_free_txskb(&local->hw, skb);
363 local->total_ps_buffered = total;
364 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
367 static ieee80211_tx_result
368 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
370 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
371 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
375 * broadcast/multicast frame
377 * If any of the associated/peer stations is in power save mode,
378 * the frame is buffered to be sent after DTIM beacon frame.
379 * This is done either by the hardware or us.
382 /* powersaving STAs currently only in AP/VLAN/mesh mode */
383 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
384 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
388 ps = &tx->sdata->bss->ps;
389 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
390 ps = &tx->sdata->u.mesh.ps;
396 /* no buffering for ordered frames */
397 if (ieee80211_has_order(hdr->frame_control))
400 /* no stations in PS mode */
401 if (!atomic_read(&ps->num_sta_ps))
404 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
405 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
406 info->hw_queue = tx->sdata->vif.cab_queue;
408 /* device releases frame after DTIM beacon */
409 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
412 /* buffered in mac80211 */
413 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
414 purge_old_ps_buffers(tx->local);
416 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
418 "BC TX buffer full - dropping the oldest frame\n");
419 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
421 tx->local->total_ps_buffered++;
423 skb_queue_tail(&ps->bc_buf, tx->skb);
428 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
431 if (!ieee80211_is_mgmt(fc))
434 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
437 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
444 static ieee80211_tx_result
445 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
447 struct sta_info *sta = tx->sta;
448 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
449 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
450 struct ieee80211_local *local = tx->local;
455 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
456 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
457 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
458 int ac = skb_get_queue_mapping(tx->skb);
460 /* only deauth, disassoc and action are bufferable MMPDUs */
461 if (ieee80211_is_mgmt(hdr->frame_control) &&
462 !ieee80211_is_deauth(hdr->frame_control) &&
463 !ieee80211_is_disassoc(hdr->frame_control) &&
464 !ieee80211_is_action(hdr->frame_control)) {
465 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
469 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
470 sta->sta.addr, sta->sta.aid, ac);
471 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
472 purge_old_ps_buffers(tx->local);
473 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
474 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
476 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
478 ieee80211_free_txskb(&local->hw, old);
480 tx->local->total_ps_buffered++;
482 info->control.jiffies = jiffies;
483 info->control.vif = &tx->sdata->vif;
484 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
485 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
487 if (!timer_pending(&local->sta_cleanup))
488 mod_timer(&local->sta_cleanup,
489 round_jiffies(jiffies +
490 STA_INFO_CLEANUP_INTERVAL));
493 * We queued up some frames, so the TIM bit might
494 * need to be set, recalculate it.
496 sta_info_recalc_tim(sta);
499 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
501 "STA %pM in PS mode, but polling/in SP -> send frame\n",
508 static ieee80211_tx_result debug_noinline
509 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
511 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
514 if (tx->flags & IEEE80211_TX_UNICAST)
515 return ieee80211_tx_h_unicast_ps_buf(tx);
517 return ieee80211_tx_h_multicast_ps_buf(tx);
520 static ieee80211_tx_result debug_noinline
521 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
523 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
525 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
526 tx->sdata->control_port_no_encrypt))
527 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
532 static ieee80211_tx_result debug_noinline
533 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
535 struct ieee80211_key *key;
536 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
537 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
539 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
541 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
543 else if (ieee80211_is_mgmt(hdr->frame_control) &&
544 is_multicast_ether_addr(hdr->addr1) &&
545 ieee80211_is_robust_mgmt_frame(hdr) &&
546 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
548 else if (is_multicast_ether_addr(hdr->addr1) &&
549 (key = rcu_dereference(tx->sdata->default_multicast_key)))
551 else if (!is_multicast_ether_addr(hdr->addr1) &&
552 (key = rcu_dereference(tx->sdata->default_unicast_key)))
554 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
556 else if (!tx->sdata->drop_unencrypted)
558 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
560 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
561 !(ieee80211_is_action(hdr->frame_control) &&
562 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
564 else if (ieee80211_is_mgmt(hdr->frame_control) &&
565 !ieee80211_is_robust_mgmt_frame(hdr))
568 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
573 bool skip_hw = false;
575 tx->key->tx_rx_count++;
576 /* TODO: add threshold stuff again */
578 switch (tx->key->conf.cipher) {
579 case WLAN_CIPHER_SUITE_WEP40:
580 case WLAN_CIPHER_SUITE_WEP104:
581 case WLAN_CIPHER_SUITE_TKIP:
582 if (!ieee80211_is_data_present(hdr->frame_control))
585 case WLAN_CIPHER_SUITE_CCMP:
586 if (!ieee80211_is_data_present(hdr->frame_control) &&
587 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
591 skip_hw = (tx->key->conf.flags &
592 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
593 ieee80211_is_mgmt(hdr->frame_control);
595 case WLAN_CIPHER_SUITE_AES_CMAC:
596 if (!ieee80211_is_mgmt(hdr->frame_control))
601 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
602 !ieee80211_is_deauth(hdr->frame_control)))
605 if (!skip_hw && tx->key &&
606 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
607 info->control.hw_key = &tx->key->conf;
613 static ieee80211_tx_result debug_noinline
614 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
616 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
617 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
618 struct ieee80211_supported_band *sband;
619 struct ieee80211_rate *rate;
622 bool inval = false, rts = false, short_preamble = false;
623 struct ieee80211_tx_rate_control txrc;
626 memset(&txrc, 0, sizeof(txrc));
628 sband = tx->local->hw.wiphy->bands[info->band];
630 len = min_t(u32, tx->skb->len + FCS_LEN,
631 tx->local->hw.wiphy->frag_threshold);
633 /* set up the tx rate control struct we give the RC algo */
634 txrc.hw = &tx->local->hw;
636 txrc.bss_conf = &tx->sdata->vif.bss_conf;
638 txrc.reported_rate.idx = -1;
639 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
640 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
641 txrc.max_rate_idx = -1;
643 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
644 memcpy(txrc.rate_idx_mcs_mask,
645 tx->sdata->rc_rateidx_mcs_mask[info->band],
646 sizeof(txrc.rate_idx_mcs_mask));
647 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
648 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
649 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
651 /* set up RTS protection if desired */
652 if (len > tx->local->hw.wiphy->rts_threshold) {
653 txrc.rts = rts = true;
657 * Use short preamble if the BSS can handle it, but not for
658 * management frames unless we know the receiver can handle
659 * that -- the management frame might be to a station that
660 * just wants a probe response.
662 if (tx->sdata->vif.bss_conf.use_short_preamble &&
663 (ieee80211_is_data(hdr->frame_control) ||
664 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
665 txrc.short_preamble = short_preamble = true;
668 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
671 * Lets not bother rate control if we're associated and cannot
672 * talk to the sta. This should not happen.
674 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
675 !rate_usable_index_exists(sband, &tx->sta->sta),
676 "%s: Dropped data frame as no usable bitrate found while "
677 "scanning and associated. Target station: "
678 "%pM on %d GHz band\n",
679 tx->sdata->name, hdr->addr1,
684 * If we're associated with the sta at this point we know we can at
685 * least send the frame at the lowest bit rate.
687 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
689 if (unlikely(info->control.rates[0].idx < 0))
692 if (txrc.reported_rate.idx < 0) {
693 txrc.reported_rate = info->control.rates[0];
694 if (tx->sta && ieee80211_is_data(hdr->frame_control))
695 tx->sta->last_tx_rate = txrc.reported_rate;
697 tx->sta->last_tx_rate = txrc.reported_rate;
699 if (unlikely(!info->control.rates[0].count))
700 info->control.rates[0].count = 1;
702 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
703 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
704 info->control.rates[0].count = 1;
706 if (is_multicast_ether_addr(hdr->addr1)) {
708 * XXX: verify the rate is in the basic rateset
714 * set up the RTS/CTS rate as the fastest basic rate
715 * that is not faster than the data rate
717 * XXX: Should this check all retry rates?
719 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
722 rate = &sband->bitrates[info->control.rates[0].idx];
724 for (i = 0; i < sband->n_bitrates; i++) {
725 /* must be a basic rate */
726 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
728 /* must not be faster than the data rate */
729 if (sband->bitrates[i].bitrate > rate->bitrate)
732 if (sband->bitrates[baserate].bitrate <
733 sband->bitrates[i].bitrate)
737 info->control.rts_cts_rate_idx = baserate;
740 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
742 * make sure there's no valid rate following
743 * an invalid one, just in case drivers don't
744 * take the API seriously to stop at -1.
747 info->control.rates[i].idx = -1;
750 if (info->control.rates[i].idx < 0) {
756 * For now assume MCS is already set up correctly, this
759 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
760 WARN_ON(info->control.rates[i].idx > 76);
764 /* set up RTS protection if desired */
766 info->control.rates[i].flags |=
767 IEEE80211_TX_RC_USE_RTS_CTS;
770 if (WARN_ON_ONCE(info->control.rates[i].idx >=
771 sband->n_bitrates)) {
772 info->control.rates[i].idx = -1;
776 rate = &sband->bitrates[info->control.rates[i].idx];
778 /* set up short preamble */
779 if (short_preamble &&
780 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
781 info->control.rates[i].flags |=
782 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
784 /* set up G protection */
785 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
786 rate->flags & IEEE80211_RATE_ERP_G)
787 info->control.rates[i].flags |=
788 IEEE80211_TX_RC_USE_CTS_PROTECT;
794 static ieee80211_tx_result debug_noinline
795 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
797 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
798 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
804 * Packet injection may want to control the sequence
805 * number, if we have no matching interface then we
806 * neither assign one ourselves nor ask the driver to.
808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
811 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
814 if (ieee80211_hdrlen(hdr->frame_control) < 24)
817 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
821 * Anything but QoS data that has a sequence number field
822 * (is long enough) gets a sequence number from the global
825 if (!ieee80211_is_data_qos(hdr->frame_control)) {
826 /* driver should assign sequence number */
827 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
828 /* for pure STA mode without beacons, we can do it */
829 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
830 tx->sdata->sequence_number += 0x10;
835 * This should be true for injected/management frames only, for
836 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
837 * above since they are not QoS-data frames.
842 /* include per-STA, per-TID sequence counter */
844 qc = ieee80211_get_qos_ctl(hdr);
845 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
846 seq = &tx->sta->tid_seq[tid];
848 hdr->seq_ctrl = cpu_to_le16(*seq);
850 /* Increase the sequence number. */
851 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
856 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
857 struct sk_buff *skb, int hdrlen,
860 struct ieee80211_local *local = tx->local;
861 struct ieee80211_tx_info *info;
863 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
864 int pos = hdrlen + per_fragm;
865 int rem = skb->len - hdrlen - per_fragm;
867 if (WARN_ON(rem < 0))
870 /* first fragment was already added to queue by caller */
873 int fraglen = per_fragm;
878 tmp = dev_alloc_skb(local->tx_headroom +
880 IEEE80211_ENCRYPT_HEADROOM +
881 IEEE80211_ENCRYPT_TAILROOM);
885 __skb_queue_tail(&tx->skbs, tmp);
887 skb_reserve(tmp, local->tx_headroom +
888 IEEE80211_ENCRYPT_HEADROOM);
889 /* copy control information */
890 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
892 info = IEEE80211_SKB_CB(tmp);
893 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
894 IEEE80211_TX_CTL_FIRST_FRAGMENT);
897 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
899 skb_copy_queue_mapping(tmp, skb);
900 tmp->priority = skb->priority;
903 /* copy header and data */
904 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
905 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
910 /* adjust first fragment's length */
911 skb->len = hdrlen + per_fragm;
915 static ieee80211_tx_result debug_noinline
916 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
918 struct sk_buff *skb = tx->skb;
919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
920 struct ieee80211_hdr *hdr = (void *)skb->data;
921 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
925 /* no matter what happens, tx->skb moves to tx->skbs */
926 __skb_queue_tail(&tx->skbs, skb);
929 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
932 if (tx->local->ops->set_frag_threshold)
936 * Warn when submitting a fragmented A-MPDU frame and drop it.
937 * This scenario is handled in ieee80211_tx_prepare but extra
938 * caution taken here as fragmented ampdu may cause Tx stop.
940 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
943 hdrlen = ieee80211_hdrlen(hdr->frame_control);
945 /* internal error, why isn't DONTFRAG set? */
946 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
950 * Now fragment the frame. This will allocate all the fragments and
951 * chain them (using skb as the first fragment) to skb->next.
952 * During transmission, we will remove the successfully transmitted
953 * fragments from this list. When the low-level driver rejects one
954 * of the fragments then we will simply pretend to accept the skb
955 * but store it away as pending.
957 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
960 /* update duration/seq/flags of fragments */
963 skb_queue_walk(&tx->skbs, skb) {
964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
966 hdr = (void *)skb->data;
967 info = IEEE80211_SKB_CB(skb);
969 if (!skb_queue_is_last(&tx->skbs, skb)) {
970 hdr->frame_control |= morefrags;
972 * No multi-rate retries for fragmented frames, that
973 * would completely throw off the NAV at other STAs.
975 info->control.rates[1].idx = -1;
976 info->control.rates[2].idx = -1;
977 info->control.rates[3].idx = -1;
978 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
979 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
981 hdr->frame_control &= ~morefrags;
983 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
990 static ieee80211_tx_result debug_noinline
991 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
998 tx->sta->tx_packets++;
999 skb_queue_walk(&tx->skbs, skb) {
1000 tx->sta->tx_fragments++;
1001 tx->sta->tx_bytes += skb->len;
1007 static ieee80211_tx_result debug_noinline
1008 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1013 switch (tx->key->conf.cipher) {
1014 case WLAN_CIPHER_SUITE_WEP40:
1015 case WLAN_CIPHER_SUITE_WEP104:
1016 return ieee80211_crypto_wep_encrypt(tx);
1017 case WLAN_CIPHER_SUITE_TKIP:
1018 return ieee80211_crypto_tkip_encrypt(tx);
1019 case WLAN_CIPHER_SUITE_CCMP:
1020 return ieee80211_crypto_ccmp_encrypt(tx);
1021 case WLAN_CIPHER_SUITE_AES_CMAC:
1022 return ieee80211_crypto_aes_cmac_encrypt(tx);
1024 return ieee80211_crypto_hw_encrypt(tx);
1030 static ieee80211_tx_result debug_noinline
1031 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1033 struct sk_buff *skb;
1034 struct ieee80211_hdr *hdr;
1038 skb_queue_walk(&tx->skbs, skb) {
1039 hdr = (void *) skb->data;
1040 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1041 break; /* must not overwrite AID */
1042 if (!skb_queue_is_last(&tx->skbs, skb)) {
1043 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1044 next_len = next->len;
1047 group_addr = is_multicast_ether_addr(hdr->addr1);
1050 ieee80211_duration(tx, skb, group_addr, next_len);
1056 /* actual transmit path */
1058 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1059 struct sk_buff *skb,
1060 struct ieee80211_tx_info *info,
1061 struct tid_ampdu_tx *tid_tx,
1064 bool queued = false;
1065 bool reset_agg_timer = false;
1066 struct sk_buff *purge_skb = NULL;
1068 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1069 info->flags |= IEEE80211_TX_CTL_AMPDU;
1070 reset_agg_timer = true;
1071 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1073 * nothing -- this aggregation session is being started
1074 * but that might still fail with the driver
1077 spin_lock(&tx->sta->lock);
1079 * Need to re-check now, because we may get here
1081 * 1) in the window during which the setup is actually
1082 * already done, but not marked yet because not all
1083 * packets are spliced over to the driver pending
1084 * queue yet -- if this happened we acquire the lock
1085 * either before or after the splice happens, but
1086 * need to recheck which of these cases happened.
1088 * 2) during session teardown, if the OPERATIONAL bit
1089 * was cleared due to the teardown but the pointer
1090 * hasn't been assigned NULL yet (or we loaded it
1091 * before it was assigned) -- in this case it may
1092 * now be NULL which means we should just let the
1093 * packet pass through because splicing the frames
1094 * back is already done.
1096 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1099 /* do nothing, let packet pass through */
1100 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1101 info->flags |= IEEE80211_TX_CTL_AMPDU;
1102 reset_agg_timer = true;
1105 info->control.vif = &tx->sdata->vif;
1106 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1107 __skb_queue_tail(&tid_tx->pending, skb);
1108 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1109 purge_skb = __skb_dequeue(&tid_tx->pending);
1111 spin_unlock(&tx->sta->lock);
1114 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1117 /* reset session timer */
1118 if (reset_agg_timer && tid_tx->timeout)
1119 tid_tx->last_tx = jiffies;
1127 static ieee80211_tx_result
1128 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1129 struct ieee80211_tx_data *tx,
1130 struct sk_buff *skb)
1132 struct ieee80211_local *local = sdata->local;
1133 struct ieee80211_hdr *hdr;
1134 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1138 memset(tx, 0, sizeof(*tx));
1142 __skb_queue_head_init(&tx->skbs);
1145 * If this flag is set to true anywhere, and we get here,
1146 * we are doing the needed processing, so remove the flag
1149 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1151 hdr = (struct ieee80211_hdr *) skb->data;
1153 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1154 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1155 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1157 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1158 tx->sdata->control_port_protocol == tx->skb->protocol) {
1159 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1162 tx->sta = sta_info_get(sdata, hdr->addr1);
1164 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1165 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1166 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1167 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1168 struct tid_ampdu_tx *tid_tx;
1170 qc = ieee80211_get_qos_ctl(hdr);
1171 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1173 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1177 queued = ieee80211_tx_prep_agg(tx, skb, info,
1180 if (unlikely(queued))
1185 if (is_multicast_ether_addr(hdr->addr1)) {
1186 tx->flags &= ~IEEE80211_TX_UNICAST;
1187 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1189 tx->flags |= IEEE80211_TX_UNICAST;
1191 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1192 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1193 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1194 info->flags & IEEE80211_TX_CTL_AMPDU)
1195 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1199 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1200 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1201 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1203 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1208 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1209 struct ieee80211_vif *vif,
1210 struct ieee80211_sta *sta,
1211 struct sk_buff_head *skbs,
1214 struct ieee80211_tx_control control;
1215 struct sk_buff *skb, *tmp;
1216 unsigned long flags;
1218 skb_queue_walk_safe(skbs, skb, tmp) {
1219 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1220 int q = info->hw_queue;
1222 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1223 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1224 __skb_unlink(skb, skbs);
1225 ieee80211_free_txskb(&local->hw, skb);
1230 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1231 if (local->queue_stop_reasons[q] ||
1232 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1233 if (unlikely(info->flags &
1234 IEEE80211_TX_INTFL_OFFCHAN_TX_OK &&
1235 local->queue_stop_reasons[q] &
1236 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL))) {
1238 * Drop off-channel frames if queues are stopped
1239 * for any reason other than off-channel
1240 * operation. Never queue them.
1242 spin_unlock_irqrestore(
1243 &local->queue_stop_reason_lock, flags);
1244 ieee80211_purge_tx_queue(&local->hw, skbs);
1249 * Since queue is stopped, queue up frames for later
1250 * transmission from the tx-pending tasklet when the
1251 * queue is woken again.
1254 skb_queue_splice_init(skbs, &local->pending[q]);
1256 skb_queue_splice_tail_init(skbs,
1257 &local->pending[q]);
1259 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1263 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1265 info->control.vif = vif;
1268 __skb_unlink(skb, skbs);
1269 drv_tx(local, &control, skb);
1276 * Returns false if the frame couldn't be transmitted but was queued instead.
1278 static bool __ieee80211_tx(struct ieee80211_local *local,
1279 struct sk_buff_head *skbs, int led_len,
1280 struct sta_info *sta, bool txpending)
1282 struct ieee80211_tx_info *info;
1283 struct ieee80211_sub_if_data *sdata;
1284 struct ieee80211_vif *vif;
1285 struct ieee80211_sta *pubsta;
1286 struct sk_buff *skb;
1290 if (WARN_ON(skb_queue_empty(skbs)))
1293 skb = skb_peek(skbs);
1294 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1295 info = IEEE80211_SKB_CB(skb);
1296 sdata = vif_to_sdata(info->control.vif);
1297 if (sta && !sta->uploaded)
1305 switch (sdata->vif.type) {
1306 case NL80211_IFTYPE_MONITOR:
1307 sdata = rcu_dereference(local->monitor_sdata);
1311 vif->hw_queue[skb_get_queue_mapping(skb)];
1312 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1318 case NL80211_IFTYPE_AP_VLAN:
1319 sdata = container_of(sdata->bss,
1320 struct ieee80211_sub_if_data, u.ap);
1327 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1330 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1331 ieee80211_led_tx(local, 1);
1333 WARN_ON_ONCE(!skb_queue_empty(skbs));
1339 * Invoke TX handlers, return 0 on success and non-zero if the
1340 * frame was dropped or queued.
1342 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1344 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1345 ieee80211_tx_result res = TX_DROP;
1347 #define CALL_TXH(txh) \
1350 if (res != TX_CONTINUE) \
1354 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1355 CALL_TXH(ieee80211_tx_h_check_assoc);
1356 CALL_TXH(ieee80211_tx_h_ps_buf);
1357 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1358 CALL_TXH(ieee80211_tx_h_select_key);
1359 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1360 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1362 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1363 __skb_queue_tail(&tx->skbs, tx->skb);
1368 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1369 CALL_TXH(ieee80211_tx_h_sequence);
1370 CALL_TXH(ieee80211_tx_h_fragment);
1371 /* handlers after fragment must be aware of tx info fragmentation! */
1372 CALL_TXH(ieee80211_tx_h_stats);
1373 CALL_TXH(ieee80211_tx_h_encrypt);
1374 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1375 CALL_TXH(ieee80211_tx_h_calculate_duration);
1379 if (unlikely(res == TX_DROP)) {
1380 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1382 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1384 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1386 } else if (unlikely(res == TX_QUEUED)) {
1387 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1395 * Returns false if the frame couldn't be transmitted but was queued instead.
1397 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1398 struct sk_buff *skb, bool txpending,
1399 enum ieee80211_band band)
1401 struct ieee80211_local *local = sdata->local;
1402 struct ieee80211_tx_data tx;
1403 ieee80211_tx_result res_prepare;
1404 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1408 if (unlikely(skb->len < 10)) {
1413 /* initialises tx */
1415 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1417 if (unlikely(res_prepare == TX_DROP)) {
1418 ieee80211_free_txskb(&local->hw, skb);
1420 } else if (unlikely(res_prepare == TX_QUEUED)) {
1426 /* set up hw_queue value early */
1427 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1428 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1430 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1432 if (!invoke_tx_handlers(&tx))
1433 result = __ieee80211_tx(local, &tx.skbs, led_len,
1439 /* device xmit handlers */
1441 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1442 struct sk_buff *skb,
1443 int head_need, bool may_encrypt)
1445 struct ieee80211_local *local = sdata->local;
1448 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1449 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1450 tail_need -= skb_tailroom(skb);
1451 tail_need = max_t(int, tail_need, 0);
1454 if (skb_cloned(skb))
1455 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1456 else if (head_need || tail_need)
1457 I802_DEBUG_INC(local->tx_expand_skb_head);
1461 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1462 wiphy_debug(local->hw.wiphy,
1463 "failed to reallocate TX buffer\n");
1470 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1471 enum ieee80211_band band)
1473 struct ieee80211_local *local = sdata->local;
1474 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1475 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1479 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1481 headroom = local->tx_headroom;
1483 headroom += IEEE80211_ENCRYPT_HEADROOM;
1484 headroom -= skb_headroom(skb);
1485 headroom = max_t(int, 0, headroom);
1487 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1488 ieee80211_free_txskb(&local->hw, skb);
1492 hdr = (struct ieee80211_hdr *) skb->data;
1493 info->control.vif = &sdata->vif;
1495 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1496 if (ieee80211_is_data(hdr->frame_control) &&
1497 is_unicast_ether_addr(hdr->addr1)) {
1498 if (mesh_nexthop_resolve(sdata, skb))
1499 return; /* skb queued: don't free */
1501 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1505 ieee80211_set_qos_hdr(sdata, skb);
1506 ieee80211_tx(sdata, skb, false, band);
1509 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1511 struct ieee80211_radiotap_iterator iterator;
1512 struct ieee80211_radiotap_header *rthdr =
1513 (struct ieee80211_radiotap_header *) skb->data;
1514 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1515 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1519 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1520 IEEE80211_TX_CTL_DONTFRAG;
1523 * for every radiotap entry that is present
1524 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1525 * entries present, or -EINVAL on error)
1529 ret = ieee80211_radiotap_iterator_next(&iterator);
1534 /* see if this argument is something we can use */
1535 switch (iterator.this_arg_index) {
1537 * You must take care when dereferencing iterator.this_arg
1538 * for multibyte types... the pointer is not aligned. Use
1539 * get_unaligned((type *)iterator.this_arg) to dereference
1540 * iterator.this_arg for type "type" safely on all arches.
1542 case IEEE80211_RADIOTAP_FLAGS:
1543 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1545 * this indicates that the skb we have been
1546 * handed has the 32-bit FCS CRC at the end...
1547 * we should react to that by snipping it off
1548 * because it will be recomputed and added
1551 if (skb->len < (iterator._max_length + FCS_LEN))
1554 skb_trim(skb, skb->len - FCS_LEN);
1556 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1557 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1558 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1559 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1562 case IEEE80211_RADIOTAP_TX_FLAGS:
1563 txflags = get_unaligned_le16(iterator.this_arg);
1564 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1565 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1569 * Please update the file
1570 * Documentation/networking/mac80211-injection.txt
1571 * when parsing new fields here.
1579 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1583 * remove the radiotap header
1584 * iterator->_max_length was sanity-checked against
1585 * skb->len by iterator init
1587 skb_pull(skb, iterator._max_length);
1592 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1593 struct net_device *dev)
1595 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1596 struct ieee80211_chanctx_conf *chanctx_conf;
1597 struct ieee80211_channel *chan;
1598 struct ieee80211_radiotap_header *prthdr =
1599 (struct ieee80211_radiotap_header *)skb->data;
1600 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1601 struct ieee80211_hdr *hdr;
1602 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1606 /* check for not even having the fixed radiotap header part */
1607 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1608 goto fail; /* too short to be possibly valid */
1610 /* is it a header version we can trust to find length from? */
1611 if (unlikely(prthdr->it_version))
1612 goto fail; /* only version 0 is supported */
1614 /* then there must be a radiotap header with a length we can use */
1615 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1617 /* does the skb contain enough to deliver on the alleged length? */
1618 if (unlikely(skb->len < len_rthdr))
1619 goto fail; /* skb too short for claimed rt header extent */
1622 * fix up the pointers accounting for the radiotap
1623 * header still being in there. We are being given
1624 * a precooked IEEE80211 header so no need for
1627 skb_set_mac_header(skb, len_rthdr);
1629 * these are just fixed to the end of the rt area since we
1630 * don't have any better information and at this point, nobody cares
1632 skb_set_network_header(skb, len_rthdr);
1633 skb_set_transport_header(skb, len_rthdr);
1635 if (skb->len < len_rthdr + 2)
1638 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1639 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1641 if (skb->len < len_rthdr + hdrlen)
1645 * Initialize skb->protocol if the injected frame is a data frame
1646 * carrying a rfc1042 header
1648 if (ieee80211_is_data(hdr->frame_control) &&
1649 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1650 u8 *payload = (u8 *)hdr + hdrlen;
1652 if (ether_addr_equal(payload, rfc1042_header))
1653 skb->protocol = cpu_to_be16((payload[6] << 8) |
1657 memset(info, 0, sizeof(*info));
1659 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1660 IEEE80211_TX_CTL_INJECTED;
1662 /* process and remove the injection radiotap header */
1663 if (!ieee80211_parse_tx_radiotap(skb))
1669 * We process outgoing injected frames that have a local address
1670 * we handle as though they are non-injected frames.
1671 * This code here isn't entirely correct, the local MAC address
1672 * isn't always enough to find the interface to use; for proper
1673 * VLAN/WDS support we will need a different mechanism (which
1674 * likely isn't going to be monitor interfaces).
1676 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1678 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1679 if (!ieee80211_sdata_running(tmp_sdata))
1681 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1682 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1683 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1685 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1691 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1692 if (!chanctx_conf) {
1693 tmp_sdata = rcu_dereference(local->monitor_sdata);
1696 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1700 chan = chanctx_conf->def.chan;
1701 else if (!local->use_chanctx)
1702 chan = local->_oper_channel;
1707 * Frame injection is not allowed if beaconing is not allowed
1708 * or if we need radar detection. Beaconing is usually not allowed when
1709 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1710 * Passive scan is also used in world regulatory domains where
1711 * your country is not known and as such it should be treated as
1712 * NO TX unless the channel is explicitly allowed in which case
1713 * your current regulatory domain would not have the passive scan
1716 * Since AP mode uses monitor interfaces to inject/TX management
1717 * frames we can make AP mode the exception to this rule once it
1718 * supports radar detection as its implementation can deal with
1719 * radar detection by itself. We can do that later by adding a
1720 * monitor flag interfaces used for AP support.
1722 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1723 IEEE80211_CHAN_PASSIVE_SCAN)))
1726 ieee80211_xmit(sdata, skb, chan->band);
1729 return NETDEV_TX_OK;
1735 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1739 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1740 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1741 * @skb: packet to be sent
1742 * @dev: incoming interface
1744 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1745 * not be freed, and caller is responsible for either retrying later or freeing
1748 * This function takes in an Ethernet header and encapsulates it with suitable
1749 * IEEE 802.11 header based on which interface the packet is coming in. The
1750 * encapsulated packet will then be passed to master interface, wlan#.11, for
1751 * transmission (through low-level driver).
1753 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1754 struct net_device *dev)
1756 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1757 struct ieee80211_local *local = sdata->local;
1758 struct ieee80211_tx_info *info;
1760 u16 ethertype, hdrlen, meshhdrlen = 0;
1762 struct ieee80211_hdr hdr;
1763 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1764 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1765 const u8 *encaps_data;
1766 int encaps_len, skip_header_bytes;
1768 struct sta_info *sta = NULL;
1769 bool wme_sta = false, authorized = false, tdls_auth = false;
1770 bool tdls_direct = false;
1774 struct ieee80211_chanctx_conf *chanctx_conf;
1775 struct ieee80211_sub_if_data *ap_sdata;
1776 enum ieee80211_band band;
1778 if (unlikely(skb->len < ETH_HLEN))
1781 /* convert Ethernet header to proper 802.11 header (based on
1782 * operation mode) */
1783 ethertype = (skb->data[12] << 8) | skb->data[13];
1784 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1788 switch (sdata->vif.type) {
1789 case NL80211_IFTYPE_AP_VLAN:
1790 sta = rcu_dereference(sdata->u.vlan.sta);
1792 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1794 memcpy(hdr.addr1, sta->sta.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);
1799 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1800 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1802 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1804 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1807 band = chanctx_conf->def.chan->band;
1811 case NL80211_IFTYPE_AP:
1812 if (sdata->vif.type == NL80211_IFTYPE_AP)
1813 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1816 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1818 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1819 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1820 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1822 band = chanctx_conf->def.chan->band;
1824 case NL80211_IFTYPE_WDS:
1825 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1827 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1828 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1829 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1830 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1833 * This is the exception! WDS style interfaces are prohibited
1834 * when channel contexts are in used so this must be valid
1836 band = local->hw.conf.channel->band;
1838 #ifdef CONFIG_MAC80211_MESH
1839 case NL80211_IFTYPE_MESH_POINT:
1840 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1841 /* Do not send frames with mesh_ttl == 0 */
1842 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1846 if (!is_multicast_ether_addr(skb->data)) {
1847 mpath = mesh_path_lookup(sdata, skb->data);
1849 mppath = mpp_path_lookup(sdata, skb->data);
1853 * Use address extension if it is a packet from
1854 * another interface or if we know the destination
1855 * is being proxied by a portal (i.e. portal address
1856 * differs from proxied address)
1858 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1859 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1860 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1861 skb->data, skb->data + ETH_ALEN);
1862 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1865 /* DS -> MBSS (802.11-2012 13.11.3.3).
1866 * For unicast with unknown forwarding information,
1867 * destination might be in the MBSS or if that fails
1868 * forwarded to another mesh gate. In either case
1869 * resolution will be handled in ieee80211_xmit(), so
1870 * leave the original DA. This also works for mcast */
1871 const u8 *mesh_da = skb->data;
1874 mesh_da = mppath->mpp;
1876 mesh_da = mpath->dst;
1878 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1879 mesh_da, sdata->vif.addr);
1880 if (is_multicast_ether_addr(mesh_da))
1881 /* DA TA mSA AE:SA */
1882 meshhdrlen = ieee80211_new_mesh_header(
1884 skb->data + ETH_ALEN, NULL);
1886 /* RA TA mDA mSA AE:DA SA */
1887 meshhdrlen = ieee80211_new_mesh_header(
1888 sdata, &mesh_hdr, skb->data,
1889 skb->data + ETH_ALEN);
1892 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1895 band = chanctx_conf->def.chan->band;
1898 case NL80211_IFTYPE_STATION:
1899 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1900 bool tdls_peer = false;
1902 sta = sta_info_get(sdata, skb->data);
1904 authorized = test_sta_flag(sta,
1905 WLAN_STA_AUTHORIZED);
1906 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1907 tdls_peer = test_sta_flag(sta,
1908 WLAN_STA_TDLS_PEER);
1909 tdls_auth = test_sta_flag(sta,
1910 WLAN_STA_TDLS_PEER_AUTH);
1914 * If the TDLS link is enabled, send everything
1915 * directly. Otherwise, allow TDLS setup frames
1916 * to be transmitted indirectly.
1918 tdls_direct = tdls_peer && (tdls_auth ||
1919 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1920 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1924 /* link during setup - throw out frames to peer */
1929 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1930 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1931 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1933 } else if (sdata->u.mgd.use_4addr &&
1934 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1935 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1936 IEEE80211_FCTL_TODS);
1938 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1939 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1940 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1941 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1944 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1946 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1947 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1948 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1951 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1954 band = chanctx_conf->def.chan->band;
1956 case NL80211_IFTYPE_ADHOC:
1958 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1959 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1960 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1962 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1965 band = chanctx_conf->def.chan->band;
1972 * There's no need to try to look up the destination
1973 * if it is a multicast address (which can only happen
1976 multicast = is_multicast_ether_addr(hdr.addr1);
1978 sta = sta_info_get(sdata, hdr.addr1);
1980 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1981 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1985 /* For mesh, the use of the QoS header is mandatory */
1986 if (ieee80211_vif_is_mesh(&sdata->vif))
1989 /* receiver and we are QoS enabled, use a QoS type frame */
1990 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1991 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1996 * Drop unicast frames to unauthorised stations unless they are
1997 * EAPOL frames from the local station.
1999 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2000 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
2001 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2002 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2003 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2004 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2005 dev->name, hdr.addr1);
2008 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2013 if (unlikely(!multicast && skb->sk &&
2014 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2015 struct sk_buff *orig_skb = skb;
2017 skb = skb_clone(skb, GFP_ATOMIC);
2019 unsigned long flags;
2022 spin_lock_irqsave(&local->ack_status_lock, flags);
2023 r = idr_get_new_above(&local->ack_status_frames,
2026 idr_pre_get(&local->ack_status_frames,
2028 r = idr_get_new_above(&local->ack_status_frames,
2031 if (WARN_ON(!id) || id > 0xffff) {
2032 idr_remove(&local->ack_status_frames, id);
2035 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2039 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2040 } else if (skb_shared(skb)) {
2041 kfree_skb(orig_skb);
2047 /* couldn't clone -- lose tx status ... */
2053 * If the skb is shared we need to obtain our own copy.
2055 if (skb_shared(skb)) {
2056 struct sk_buff *tmp_skb = skb;
2058 /* can't happen -- skb is a clone if info_id != 0 */
2061 skb = skb_clone(skb, GFP_ATOMIC);
2068 hdr.frame_control = fc;
2069 hdr.duration_id = 0;
2072 skip_header_bytes = ETH_HLEN;
2073 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2074 encaps_data = bridge_tunnel_header;
2075 encaps_len = sizeof(bridge_tunnel_header);
2076 skip_header_bytes -= 2;
2077 } else if (ethertype >= 0x600) {
2078 encaps_data = rfc1042_header;
2079 encaps_len = sizeof(rfc1042_header);
2080 skip_header_bytes -= 2;
2086 nh_pos = skb_network_header(skb) - skb->data;
2087 h_pos = skb_transport_header(skb) - skb->data;
2089 skb_pull(skb, skip_header_bytes);
2090 nh_pos -= skip_header_bytes;
2091 h_pos -= skip_header_bytes;
2093 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2096 * So we need to modify the skb header and hence need a copy of
2097 * that. The head_need variable above doesn't, so far, include
2098 * the needed header space that we don't need right away. If we
2099 * can, then we don't reallocate right now but only after the
2100 * frame arrives at the master device (if it does...)
2102 * If we cannot, however, then we will reallocate to include all
2103 * the ever needed space. Also, if we need to reallocate it anyway,
2104 * make it big enough for everything we may ever need.
2107 if (head_need > 0 || skb_cloned(skb)) {
2108 head_need += IEEE80211_ENCRYPT_HEADROOM;
2109 head_need += local->tx_headroom;
2110 head_need = max_t(int, 0, head_need);
2111 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2112 ieee80211_free_txskb(&local->hw, skb);
2119 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2120 nh_pos += encaps_len;
2121 h_pos += encaps_len;
2124 #ifdef CONFIG_MAC80211_MESH
2125 if (meshhdrlen > 0) {
2126 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2127 nh_pos += meshhdrlen;
2128 h_pos += meshhdrlen;
2132 if (ieee80211_is_data_qos(fc)) {
2133 __le16 *qos_control;
2135 qos_control = (__le16*) skb_push(skb, 2);
2136 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2138 * Maybe we could actually set some fields here, for now just
2139 * initialise to zero to indicate no special operation.
2143 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2148 dev->stats.tx_packets++;
2149 dev->stats.tx_bytes += skb->len;
2151 /* Update skb pointers to various headers since this modified frame
2152 * is going to go through Linux networking code that may potentially
2153 * need things like pointer to IP header. */
2154 skb_set_mac_header(skb, 0);
2155 skb_set_network_header(skb, nh_pos);
2156 skb_set_transport_header(skb, h_pos);
2158 info = IEEE80211_SKB_CB(skb);
2159 memset(info, 0, sizeof(*info));
2161 dev->trans_start = jiffies;
2163 info->flags = info_flags;
2164 info->ack_frame_id = info_id;
2166 ieee80211_xmit(sdata, skb, band);
2169 return NETDEV_TX_OK;
2175 return NETDEV_TX_OK;
2180 * ieee80211_clear_tx_pending may not be called in a context where
2181 * it is possible that it packets could come in again.
2183 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2185 struct sk_buff *skb;
2188 for (i = 0; i < local->hw.queues; i++) {
2189 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2190 ieee80211_free_txskb(&local->hw, skb);
2195 * Returns false if the frame couldn't be transmitted but was queued instead,
2196 * which in this case means re-queued -- take as an indication to stop sending
2197 * more pending frames.
2199 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2200 struct sk_buff *skb)
2202 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2203 struct ieee80211_sub_if_data *sdata;
2204 struct sta_info *sta;
2205 struct ieee80211_hdr *hdr;
2207 struct ieee80211_chanctx_conf *chanctx_conf;
2209 sdata = vif_to_sdata(info->control.vif);
2211 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2212 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2213 if (unlikely(!chanctx_conf)) {
2217 result = ieee80211_tx(sdata, skb, true,
2218 chanctx_conf->def.chan->band);
2220 struct sk_buff_head skbs;
2222 __skb_queue_head_init(&skbs);
2223 __skb_queue_tail(&skbs, skb);
2225 hdr = (struct ieee80211_hdr *)skb->data;
2226 sta = sta_info_get(sdata, hdr->addr1);
2228 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2235 * Transmit all pending packets. Called from tasklet.
2237 void ieee80211_tx_pending(unsigned long data)
2239 struct ieee80211_local *local = (struct ieee80211_local *)data;
2240 unsigned long flags;
2246 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2247 for (i = 0; i < local->hw.queues; i++) {
2249 * If queue is stopped by something other than due to pending
2250 * frames, or we have no pending frames, proceed to next queue.
2252 if (local->queue_stop_reasons[i] ||
2253 skb_queue_empty(&local->pending[i]))
2256 while (!skb_queue_empty(&local->pending[i])) {
2257 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2258 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2260 if (WARN_ON(!info->control.vif)) {
2261 ieee80211_free_txskb(&local->hw, skb);
2265 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2268 txok = ieee80211_tx_pending_skb(local, skb);
2269 spin_lock_irqsave(&local->queue_stop_reason_lock,
2275 if (skb_queue_empty(&local->pending[i]))
2276 ieee80211_propagate_queue_wake(local, i);
2278 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2283 /* functions for drivers to get certain frames */
2285 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2286 struct ps_data *ps, struct sk_buff *skb)
2290 int i, have_bits = 0, n1, n2;
2292 /* Generate bitmap for TIM only if there are any STAs in power save
2294 if (atomic_read(&ps->num_sta_ps) > 0)
2295 /* in the hope that this is faster than
2296 * checking byte-for-byte */
2297 have_bits = !bitmap_empty((unsigned long*)ps->tim,
2298 IEEE80211_MAX_AID+1);
2300 if (ps->dtim_count == 0)
2301 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2305 tim = pos = (u8 *) skb_put(skb, 6);
2306 *pos++ = WLAN_EID_TIM;
2308 *pos++ = ps->dtim_count;
2309 *pos++ = sdata->vif.bss_conf.dtim_period;
2311 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2314 ps->dtim_bc_mc = aid0 == 1;
2317 /* Find largest even number N1 so that bits numbered 1 through
2318 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2319 * (N2 + 1) x 8 through 2007 are 0. */
2321 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2328 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2335 /* Bitmap control */
2337 /* Part Virt Bitmap */
2338 skb_put(skb, n2 - n1);
2339 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2341 tim[1] = n2 - n1 + 4;
2343 *pos++ = aid0; /* Bitmap control */
2344 *pos++ = 0; /* Part Virt Bitmap */
2348 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2349 struct ps_data *ps, struct sk_buff *skb)
2351 struct ieee80211_local *local = sdata->local;
2354 * Not very nice, but we want to allow the driver to call
2355 * ieee80211_beacon_get() as a response to the set_tim()
2356 * callback. That, however, is already invoked under the
2357 * sta_lock to guarantee consistent and race-free update
2358 * of the tim bitmap in mac80211 and the driver.
2360 if (local->tim_in_locked_section) {
2361 __ieee80211_beacon_add_tim(sdata, ps, skb);
2363 spin_lock(&local->tim_lock);
2364 __ieee80211_beacon_add_tim(sdata, ps, skb);
2365 spin_unlock(&local->tim_lock);
2371 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2372 struct ieee80211_vif *vif,
2373 u16 *tim_offset, u16 *tim_length)
2375 struct ieee80211_local *local = hw_to_local(hw);
2376 struct sk_buff *skb = NULL;
2377 struct ieee80211_tx_info *info;
2378 struct ieee80211_sub_if_data *sdata = NULL;
2379 enum ieee80211_band band;
2380 struct ieee80211_tx_rate_control txrc;
2381 struct ieee80211_chanctx_conf *chanctx_conf;
2385 sdata = vif_to_sdata(vif);
2386 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2388 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2396 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2397 struct ieee80211_if_ap *ap = &sdata->u.ap;
2398 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2402 * headroom, head length,
2403 * tail length and maximum TIM length
2405 skb = dev_alloc_skb(local->tx_headroom +
2407 beacon->tail_len + 256);
2411 skb_reserve(skb, local->tx_headroom);
2412 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2415 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2418 *tim_offset = beacon->head_len;
2420 *tim_length = skb->len - beacon->head_len;
2423 memcpy(skb_put(skb, beacon->tail_len),
2424 beacon->tail, beacon->tail_len);
2427 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2428 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2429 struct ieee80211_hdr *hdr;
2430 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2435 skb = skb_copy(presp, GFP_ATOMIC);
2439 hdr = (struct ieee80211_hdr *) skb->data;
2440 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2441 IEEE80211_STYPE_BEACON);
2442 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2443 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2444 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
2449 if (ifmsh->sync_ops)
2450 ifmsh->sync_ops->adjust_tbtt(
2453 skb = dev_alloc_skb(local->tx_headroom +
2459 skb_reserve(skb, local->tx_headroom);
2460 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2461 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2462 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
2468 band = chanctx_conf->def.chan->band;
2470 info = IEEE80211_SKB_CB(skb);
2472 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2473 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2476 memset(&txrc, 0, sizeof(txrc));
2478 txrc.sband = local->hw.wiphy->bands[band];
2479 txrc.bss_conf = &sdata->vif.bss_conf;
2481 txrc.reported_rate.idx = -1;
2482 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2483 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2484 txrc.max_rate_idx = -1;
2486 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2487 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band],
2488 sizeof(txrc.rate_idx_mcs_mask));
2490 rate_control_get_rate(sdata, NULL, &txrc);
2492 info->control.vif = vif;
2494 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2495 IEEE80211_TX_CTL_ASSIGN_SEQ |
2496 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2501 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2503 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2504 struct ieee80211_vif *vif)
2506 struct ieee80211_if_ap *ap = NULL;
2507 struct sk_buff *skb = NULL;
2508 struct probe_resp *presp = NULL;
2509 struct ieee80211_hdr *hdr;
2510 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2512 if (sdata->vif.type != NL80211_IFTYPE_AP)
2518 presp = rcu_dereference(ap->probe_resp);
2522 skb = dev_alloc_skb(presp->len);
2526 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2528 hdr = (struct ieee80211_hdr *) skb->data;
2529 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2535 EXPORT_SYMBOL(ieee80211_proberesp_get);
2537 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2538 struct ieee80211_vif *vif)
2540 struct ieee80211_sub_if_data *sdata;
2541 struct ieee80211_if_managed *ifmgd;
2542 struct ieee80211_pspoll *pspoll;
2543 struct ieee80211_local *local;
2544 struct sk_buff *skb;
2546 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2549 sdata = vif_to_sdata(vif);
2550 ifmgd = &sdata->u.mgd;
2551 local = sdata->local;
2553 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2557 skb_reserve(skb, local->hw.extra_tx_headroom);
2559 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2560 memset(pspoll, 0, sizeof(*pspoll));
2561 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2562 IEEE80211_STYPE_PSPOLL);
2563 pspoll->aid = cpu_to_le16(ifmgd->aid);
2565 /* aid in PS-Poll has its two MSBs each set to 1 */
2566 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2568 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2569 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2573 EXPORT_SYMBOL(ieee80211_pspoll_get);
2575 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2576 struct ieee80211_vif *vif)
2578 struct ieee80211_hdr_3addr *nullfunc;
2579 struct ieee80211_sub_if_data *sdata;
2580 struct ieee80211_if_managed *ifmgd;
2581 struct ieee80211_local *local;
2582 struct sk_buff *skb;
2584 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2587 sdata = vif_to_sdata(vif);
2588 ifmgd = &sdata->u.mgd;
2589 local = sdata->local;
2591 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2595 skb_reserve(skb, local->hw.extra_tx_headroom);
2597 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2599 memset(nullfunc, 0, sizeof(*nullfunc));
2600 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2601 IEEE80211_STYPE_NULLFUNC |
2602 IEEE80211_FCTL_TODS);
2603 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2604 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2605 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2609 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2611 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2612 struct ieee80211_vif *vif,
2613 const u8 *ssid, size_t ssid_len,
2616 struct ieee80211_sub_if_data *sdata;
2617 struct ieee80211_local *local;
2618 struct ieee80211_hdr_3addr *hdr;
2619 struct sk_buff *skb;
2623 sdata = vif_to_sdata(vif);
2624 local = sdata->local;
2625 ie_ssid_len = 2 + ssid_len;
2627 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2628 ie_ssid_len + tailroom);
2632 skb_reserve(skb, local->hw.extra_tx_headroom);
2634 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2635 memset(hdr, 0, sizeof(*hdr));
2636 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2637 IEEE80211_STYPE_PROBE_REQ);
2638 eth_broadcast_addr(hdr->addr1);
2639 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2640 eth_broadcast_addr(hdr->addr3);
2642 pos = skb_put(skb, ie_ssid_len);
2643 *pos++ = WLAN_EID_SSID;
2646 memcpy(pos, ssid, ssid_len);
2651 EXPORT_SYMBOL(ieee80211_probereq_get);
2653 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2654 const void *frame, size_t frame_len,
2655 const struct ieee80211_tx_info *frame_txctl,
2656 struct ieee80211_rts *rts)
2658 const struct ieee80211_hdr *hdr = frame;
2660 rts->frame_control =
2661 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2662 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2664 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2665 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2667 EXPORT_SYMBOL(ieee80211_rts_get);
2669 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2670 const void *frame, size_t frame_len,
2671 const struct ieee80211_tx_info *frame_txctl,
2672 struct ieee80211_cts *cts)
2674 const struct ieee80211_hdr *hdr = frame;
2676 cts->frame_control =
2677 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2678 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2679 frame_len, frame_txctl);
2680 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2682 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2685 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2686 struct ieee80211_vif *vif)
2688 struct ieee80211_local *local = hw_to_local(hw);
2689 struct sk_buff *skb = NULL;
2690 struct ieee80211_tx_data tx;
2691 struct ieee80211_sub_if_data *sdata;
2693 struct ieee80211_tx_info *info;
2694 struct ieee80211_chanctx_conf *chanctx_conf;
2696 sdata = vif_to_sdata(vif);
2699 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2704 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2705 struct beacon_data *beacon =
2706 rcu_dereference(sdata->u.ap.beacon);
2708 if (!beacon || !beacon->head)
2711 ps = &sdata->u.ap.ps;
2712 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2713 ps = &sdata->u.mesh.ps;
2718 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2719 goto out; /* send buffered bc/mc only after DTIM beacon */
2722 skb = skb_dequeue(&ps->bc_buf);
2725 local->total_ps_buffered--;
2727 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2728 struct ieee80211_hdr *hdr =
2729 (struct ieee80211_hdr *) skb->data;
2730 /* more buffered multicast/broadcast frames ==> set
2731 * MoreData flag in IEEE 802.11 header to inform PS
2733 hdr->frame_control |=
2734 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2737 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
2738 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2740 dev_kfree_skb_any(skb);
2743 info = IEEE80211_SKB_CB(skb);
2745 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2746 info->band = chanctx_conf->def.chan->band;
2748 if (invoke_tx_handlers(&tx))
2755 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2757 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2758 struct sk_buff *skb, int tid,
2759 enum ieee80211_band band)
2761 int ac = ieee802_1d_to_ac[tid & 7];
2763 skb_set_mac_header(skb, 0);
2764 skb_set_network_header(skb, 0);
2765 skb_set_transport_header(skb, 0);
2767 skb_set_queue_mapping(skb, ac);
2768 skb->priority = tid;
2770 skb->dev = sdata->dev;
2773 * The other path calling ieee80211_xmit is from the tasklet,
2774 * and while we can handle concurrent transmissions locking
2775 * requirements are that we do not come into tx with bhs on.
2778 ieee80211_xmit(sdata, skb, band);