2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
40 struct sk_buff *skb, int group_addr,
43 int rate, mrate, erp, dur, i;
44 struct ieee80211_rate *txrate;
45 struct ieee80211_local *local = tx->local;
46 struct ieee80211_supported_band *sband;
47 struct ieee80211_hdr *hdr;
48 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
50 /* assume HW handles this */
51 if (tx->rate.flags & IEEE80211_TX_RC_MCS)
55 if (WARN_ON_ONCE(tx->rate.idx < 0))
58 sband = local->hw.wiphy->bands[info->band];
59 txrate = &sband->bitrates[tx->rate.idx];
61 erp = txrate->flags & IEEE80211_RATE_ERP_G;
64 * data and mgmt (except PS Poll):
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
80 hdr = (struct ieee80211_hdr *)skb->data;
81 if (ieee80211_is_ctl(hdr->frame_control)) {
82 /* TODO: These control frames are not currently sent by
83 * mac80211, but should they be implemented, this function
84 * needs to be updated to support duration field calculation.
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
94 * PS Poll: BIT(15) | BIT(14) | aid
100 if (0 /* FIX: data/mgmt during CFP */)
101 return cpu_to_le16(32768);
103 if (group_addr) /* Group address as the destination - no ACK */
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 /* use lowest available if everything fails */
118 mrate = sband->bitrates[0].bitrate;
119 for (i = 0; i < sband->n_bitrates; i++) {
120 struct ieee80211_rate *r = &sband->bitrates[i];
122 if (r->bitrate > txrate->bitrate)
125 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
128 switch (sband->band) {
129 case IEEE80211_BAND_2GHZ: {
131 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
132 flag = IEEE80211_RATE_MANDATORY_G;
134 flag = IEEE80211_RATE_MANDATORY_B;
139 case IEEE80211_BAND_5GHZ:
140 if (r->flags & IEEE80211_RATE_MANDATORY_A)
143 case IEEE80211_BAND_60GHZ:
144 /* TODO, for now fall through */
145 case IEEE80211_NUM_BANDS:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
157 if (ieee80211_is_data_qos(hdr->frame_control) &&
158 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
161 /* Time needed to transmit ACK
162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
163 * to closest integer */
164 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
165 tx->sdata->vif.bss_conf.use_short_preamble);
168 /* Frame is fragmented: duration increases with time needed to
169 * transmit next fragment plus ACK and 2 x SIFS. */
170 dur *= 2; /* ACK + SIFS */
172 dur += ieee80211_frame_duration(sband->band, next_frag_len,
173 txrate->bitrate, erp,
174 tx->sdata->vif.bss_conf.use_short_preamble);
177 return cpu_to_le16(dur);
181 static ieee80211_tx_result debug_noinline
182 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
184 struct ieee80211_local *local = tx->local;
185 struct ieee80211_if_managed *ifmgd;
187 /* driver doesn't support power save */
188 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
191 /* hardware does dynamic power save */
192 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
195 /* dynamic power save disabled */
196 if (local->hw.conf.dynamic_ps_timeout <= 0)
199 /* we are scanning, don't enable power save */
203 if (!local->ps_sdata)
206 /* No point if we're going to suspend */
207 if (local->quiescing)
210 /* dynamic ps is supported only in managed mode */
211 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
214 ifmgd = &tx->sdata->u.mgd;
217 * Don't wakeup from power save if u-apsd is enabled, voip ac has
218 * u-apsd enabled and the frame is in voip class. This effectively
219 * means that even if all access categories have u-apsd enabled, in
220 * practise u-apsd is only used with the voip ac. This is a
221 * workaround for the case when received voip class packets do not
222 * have correct qos tag for some reason, due the network or the
225 * Note: ifmgd->uapsd_queues access is racy here. If the value is
226 * changed via debugfs, user needs to reassociate manually to have
227 * everything in sync.
229 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
230 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
231 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
234 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
235 ieee80211_stop_queues_by_reason(&local->hw,
236 IEEE80211_MAX_QUEUE_MAP,
237 IEEE80211_QUEUE_STOP_REASON_PS);
238 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
239 ieee80211_queue_work(&local->hw,
240 &local->dynamic_ps_disable_work);
243 /* Don't restart the timer if we're not disassociated */
244 if (!ifmgd->associated)
247 mod_timer(&local->dynamic_ps_timer, jiffies +
248 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
253 static ieee80211_tx_result debug_noinline
254 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
257 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
258 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
261 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
264 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
265 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
266 !ieee80211_is_probe_req(hdr->frame_control) &&
267 !ieee80211_is_nullfunc(hdr->frame_control))
269 * When software scanning only nullfunc frames (to notify
270 * the sleep state to the AP) and probe requests (for the
271 * active scan) are allowed, all other frames should not be
272 * sent and we should not get here, but if we do
273 * nonetheless, drop them to avoid sending them
274 * off-channel. See the link below and
275 * ieee80211_start_scan() for more.
277 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
281 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
284 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
287 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
291 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
293 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
294 if (unlikely(!assoc &&
295 ieee80211_is_data(hdr->frame_control))) {
296 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
297 sdata_info(tx->sdata,
298 "dropped data frame to not associated station %pM\n",
301 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
304 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
305 ieee80211_is_data(hdr->frame_control) &&
306 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
308 * No associated STAs - no need to send multicast
317 /* This function is called whenever the AP is about to exceed the maximum limit
318 * of buffered frames for power saving STAs. This situation should not really
319 * happen often during normal operation, so dropping the oldest buffered packet
320 * from each queue should be OK to make some room for new frames. */
321 static void purge_old_ps_buffers(struct ieee80211_local *local)
323 int total = 0, purged = 0;
325 struct ieee80211_sub_if_data *sdata;
326 struct sta_info *sta;
328 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
331 if (sdata->vif.type == NL80211_IFTYPE_AP)
332 ps = &sdata->u.ap.ps;
333 else if (ieee80211_vif_is_mesh(&sdata->vif))
334 ps = &sdata->u.mesh.ps;
338 skb = skb_dequeue(&ps->bc_buf);
343 total += skb_queue_len(&ps->bc_buf);
347 * Drop one frame from each station from the lowest-priority
348 * AC that has frames at all.
350 list_for_each_entry_rcu(sta, &local->sta_list, list) {
353 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
354 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
355 total += skb_queue_len(&sta->ps_tx_buf[ac]);
358 ieee80211_free_txskb(&local->hw, skb);
364 local->total_ps_buffered = total;
365 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
368 static ieee80211_tx_result
369 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
371 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
372 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
376 * broadcast/multicast frame
378 * If any of the associated/peer stations is in power save mode,
379 * the frame is buffered to be sent after DTIM beacon frame.
380 * This is done either by the hardware or us.
383 /* powersaving STAs currently only in AP/VLAN/mesh mode */
384 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
385 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
389 ps = &tx->sdata->bss->ps;
390 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
391 ps = &tx->sdata->u.mesh.ps;
397 /* no buffering for ordered frames */
398 if (ieee80211_has_order(hdr->frame_control))
401 /* no stations in PS mode */
402 if (!atomic_read(&ps->num_sta_ps))
405 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
406 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
407 info->hw_queue = tx->sdata->vif.cab_queue;
409 /* device releases frame after DTIM beacon */
410 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
413 /* buffered in mac80211 */
414 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
415 purge_old_ps_buffers(tx->local);
417 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
419 "BC TX buffer full - dropping the oldest frame\n");
420 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
422 tx->local->total_ps_buffered++;
424 skb_queue_tail(&ps->bc_buf, tx->skb);
429 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
432 if (!ieee80211_is_mgmt(fc))
435 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
438 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
445 static ieee80211_tx_result
446 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
448 struct sta_info *sta = tx->sta;
449 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
450 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
451 struct ieee80211_local *local = tx->local;
456 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
457 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
458 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
459 int ac = skb_get_queue_mapping(tx->skb);
461 /* only deauth, disassoc and action are bufferable MMPDUs */
462 if (ieee80211_is_mgmt(hdr->frame_control) &&
463 !ieee80211_is_deauth(hdr->frame_control) &&
464 !ieee80211_is_disassoc(hdr->frame_control) &&
465 !ieee80211_is_action(hdr->frame_control)) {
466 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
470 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
471 sta->sta.addr, sta->sta.aid, ac);
472 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
473 purge_old_ps_buffers(tx->local);
474 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
475 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
477 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
479 ieee80211_free_txskb(&local->hw, old);
481 tx->local->total_ps_buffered++;
483 info->control.jiffies = jiffies;
484 info->control.vif = &tx->sdata->vif;
485 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
486 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
488 if (!timer_pending(&local->sta_cleanup))
489 mod_timer(&local->sta_cleanup,
490 round_jiffies(jiffies +
491 STA_INFO_CLEANUP_INTERVAL));
494 * We queued up some frames, so the TIM bit might
495 * need to be set, recalculate it.
497 sta_info_recalc_tim(sta);
500 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
502 "STA %pM in PS mode, but polling/in SP -> send frame\n",
509 static ieee80211_tx_result debug_noinline
510 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
512 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
515 if (tx->flags & IEEE80211_TX_UNICAST)
516 return ieee80211_tx_h_unicast_ps_buf(tx);
518 return ieee80211_tx_h_multicast_ps_buf(tx);
521 static ieee80211_tx_result debug_noinline
522 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
524 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
526 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
527 tx->sdata->control_port_no_encrypt))
528 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
533 static ieee80211_tx_result debug_noinline
534 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
536 struct ieee80211_key *key;
537 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
538 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
540 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
542 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
544 else if (ieee80211_is_mgmt(hdr->frame_control) &&
545 is_multicast_ether_addr(hdr->addr1) &&
546 ieee80211_is_robust_mgmt_frame(hdr) &&
547 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
549 else if (is_multicast_ether_addr(hdr->addr1) &&
550 (key = rcu_dereference(tx->sdata->default_multicast_key)))
552 else if (!is_multicast_ether_addr(hdr->addr1) &&
553 (key = rcu_dereference(tx->sdata->default_unicast_key)))
555 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
557 else if (!tx->sdata->drop_unencrypted)
559 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
561 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
562 !(ieee80211_is_action(hdr->frame_control) &&
563 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
565 else if (ieee80211_is_mgmt(hdr->frame_control) &&
566 !ieee80211_is_robust_mgmt_frame(hdr))
569 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
574 bool skip_hw = false;
576 tx->key->tx_rx_count++;
577 /* TODO: add threshold stuff again */
579 switch (tx->key->conf.cipher) {
580 case WLAN_CIPHER_SUITE_WEP40:
581 case WLAN_CIPHER_SUITE_WEP104:
582 case WLAN_CIPHER_SUITE_TKIP:
583 if (!ieee80211_is_data_present(hdr->frame_control))
586 case WLAN_CIPHER_SUITE_CCMP:
587 if (!ieee80211_is_data_present(hdr->frame_control) &&
588 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
592 skip_hw = (tx->key->conf.flags &
593 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
594 ieee80211_is_mgmt(hdr->frame_control);
596 case WLAN_CIPHER_SUITE_AES_CMAC:
597 if (!ieee80211_is_mgmt(hdr->frame_control))
602 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
603 !ieee80211_is_deauth(hdr->frame_control)))
606 if (!skip_hw && tx->key &&
607 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
608 info->control.hw_key = &tx->key->conf;
614 static ieee80211_tx_result debug_noinline
615 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
617 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
618 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
619 struct ieee80211_supported_band *sband;
621 struct ieee80211_tx_rate_control txrc;
622 struct ieee80211_sta_rates *ratetbl = NULL;
625 memset(&txrc, 0, sizeof(txrc));
627 sband = tx->local->hw.wiphy->bands[info->band];
629 len = min_t(u32, tx->skb->len + FCS_LEN,
630 tx->local->hw.wiphy->frag_threshold);
632 /* set up the tx rate control struct we give the RC algo */
633 txrc.hw = &tx->local->hw;
635 txrc.bss_conf = &tx->sdata->vif.bss_conf;
637 txrc.reported_rate.idx = -1;
638 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
639 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
640 txrc.max_rate_idx = -1;
642 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
644 if (tx->sdata->rc_has_mcs_mask[info->band])
645 txrc.rate_idx_mcs_mask =
646 tx->sdata->rc_rateidx_mcs_mask[info->band];
648 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
649 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
650 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
652 /* set up RTS protection if desired */
653 if (len > tx->local->hw.wiphy->rts_threshold) {
657 info->control.use_rts = txrc.rts;
658 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
661 * Use short preamble if the BSS can handle it, but not for
662 * management frames unless we know the receiver can handle
663 * that -- the management frame might be to a station that
664 * just wants a probe response.
666 if (tx->sdata->vif.bss_conf.use_short_preamble &&
667 (ieee80211_is_data(hdr->frame_control) ||
668 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
669 txrc.short_preamble = true;
671 info->control.short_preamble = txrc.short_preamble;
674 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
677 * Lets not bother rate control if we're associated and cannot
678 * talk to the sta. This should not happen.
680 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
681 !rate_usable_index_exists(sband, &tx->sta->sta),
682 "%s: Dropped data frame as no usable bitrate found while "
683 "scanning and associated. Target station: "
684 "%pM on %d GHz band\n",
685 tx->sdata->name, hdr->addr1,
690 * If we're associated with the sta at this point we know we can at
691 * least send the frame at the lowest bit rate.
693 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
695 if (tx->sta && !info->control.skip_table)
696 ratetbl = rcu_dereference(tx->sta->sta.rates);
698 if (unlikely(info->control.rates[0].idx < 0)) {
700 struct ieee80211_tx_rate rate = {
701 .idx = ratetbl->rate[0].idx,
702 .flags = ratetbl->rate[0].flags,
703 .count = ratetbl->rate[0].count
706 if (ratetbl->rate[0].idx < 0)
714 tx->rate = info->control.rates[0];
717 if (txrc.reported_rate.idx < 0) {
718 txrc.reported_rate = tx->rate;
719 if (tx->sta && ieee80211_is_data(hdr->frame_control))
720 tx->sta->last_tx_rate = txrc.reported_rate;
722 tx->sta->last_tx_rate = txrc.reported_rate;
727 if (unlikely(!info->control.rates[0].count))
728 info->control.rates[0].count = 1;
730 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
731 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
732 info->control.rates[0].count = 1;
737 static ieee80211_tx_result debug_noinline
738 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
740 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
741 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
747 * Packet injection may want to control the sequence
748 * number, if we have no matching interface then we
749 * neither assign one ourselves nor ask the driver to.
751 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
754 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
757 if (ieee80211_hdrlen(hdr->frame_control) < 24)
760 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
764 * Anything but QoS data that has a sequence number field
765 * (is long enough) gets a sequence number from the global
768 if (!ieee80211_is_data_qos(hdr->frame_control)) {
769 /* driver should assign sequence number */
770 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
771 /* for pure STA mode without beacons, we can do it */
772 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
773 tx->sdata->sequence_number += 0x10;
778 * This should be true for injected/management frames only, for
779 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
780 * above since they are not QoS-data frames.
785 /* include per-STA, per-TID sequence counter */
787 qc = ieee80211_get_qos_ctl(hdr);
788 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
789 seq = &tx->sta->tid_seq[tid];
791 hdr->seq_ctrl = cpu_to_le16(*seq);
793 /* Increase the sequence number. */
794 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
799 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
800 struct sk_buff *skb, int hdrlen,
803 struct ieee80211_local *local = tx->local;
804 struct ieee80211_tx_info *info;
806 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
807 int pos = hdrlen + per_fragm;
808 int rem = skb->len - hdrlen - per_fragm;
810 if (WARN_ON(rem < 0))
813 /* first fragment was already added to queue by caller */
816 int fraglen = per_fragm;
821 tmp = dev_alloc_skb(local->tx_headroom +
823 IEEE80211_ENCRYPT_HEADROOM +
824 IEEE80211_ENCRYPT_TAILROOM);
828 __skb_queue_tail(&tx->skbs, tmp);
830 skb_reserve(tmp, local->tx_headroom +
831 IEEE80211_ENCRYPT_HEADROOM);
832 /* copy control information */
833 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
835 info = IEEE80211_SKB_CB(tmp);
836 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
837 IEEE80211_TX_CTL_FIRST_FRAGMENT);
840 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
842 skb_copy_queue_mapping(tmp, skb);
843 tmp->priority = skb->priority;
846 /* copy header and data */
847 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
848 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
853 /* adjust first fragment's length */
854 skb->len = hdrlen + per_fragm;
858 static ieee80211_tx_result debug_noinline
859 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
861 struct sk_buff *skb = tx->skb;
862 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
863 struct ieee80211_hdr *hdr = (void *)skb->data;
864 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
868 /* no matter what happens, tx->skb moves to tx->skbs */
869 __skb_queue_tail(&tx->skbs, skb);
872 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
875 if (tx->local->ops->set_frag_threshold)
879 * Warn when submitting a fragmented A-MPDU frame and drop it.
880 * This scenario is handled in ieee80211_tx_prepare but extra
881 * caution taken here as fragmented ampdu may cause Tx stop.
883 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
886 hdrlen = ieee80211_hdrlen(hdr->frame_control);
888 /* internal error, why isn't DONTFRAG set? */
889 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
893 * Now fragment the frame. This will allocate all the fragments and
894 * chain them (using skb as the first fragment) to skb->next.
895 * During transmission, we will remove the successfully transmitted
896 * fragments from this list. When the low-level driver rejects one
897 * of the fragments then we will simply pretend to accept the skb
898 * but store it away as pending.
900 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
903 /* update duration/seq/flags of fragments */
906 skb_queue_walk(&tx->skbs, skb) {
907 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
909 hdr = (void *)skb->data;
910 info = IEEE80211_SKB_CB(skb);
912 if (!skb_queue_is_last(&tx->skbs, skb)) {
913 hdr->frame_control |= morefrags;
915 * No multi-rate retries for fragmented frames, that
916 * would completely throw off the NAV at other STAs.
918 info->control.rates[1].idx = -1;
919 info->control.rates[2].idx = -1;
920 info->control.rates[3].idx = -1;
921 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
922 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
924 hdr->frame_control &= ~morefrags;
926 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
933 static ieee80211_tx_result debug_noinline
934 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
942 skb_queue_walk(&tx->skbs, skb) {
943 ac = skb_get_queue_mapping(skb);
944 tx->sta->tx_fragments++;
945 tx->sta->tx_bytes[ac] += skb->len;
948 tx->sta->tx_packets[ac]++;
953 static ieee80211_tx_result debug_noinline
954 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
959 switch (tx->key->conf.cipher) {
960 case WLAN_CIPHER_SUITE_WEP40:
961 case WLAN_CIPHER_SUITE_WEP104:
962 return ieee80211_crypto_wep_encrypt(tx);
963 case WLAN_CIPHER_SUITE_TKIP:
964 return ieee80211_crypto_tkip_encrypt(tx);
965 case WLAN_CIPHER_SUITE_CCMP:
966 return ieee80211_crypto_ccmp_encrypt(tx);
967 case WLAN_CIPHER_SUITE_AES_CMAC:
968 return ieee80211_crypto_aes_cmac_encrypt(tx);
970 return ieee80211_crypto_hw_encrypt(tx);
976 static ieee80211_tx_result debug_noinline
977 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
980 struct ieee80211_hdr *hdr;
984 skb_queue_walk(&tx->skbs, skb) {
985 hdr = (void *) skb->data;
986 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
987 break; /* must not overwrite AID */
988 if (!skb_queue_is_last(&tx->skbs, skb)) {
989 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
990 next_len = next->len;
993 group_addr = is_multicast_ether_addr(hdr->addr1);
996 ieee80211_duration(tx, skb, group_addr, next_len);
1002 /* actual transmit path */
1004 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1005 struct sk_buff *skb,
1006 struct ieee80211_tx_info *info,
1007 struct tid_ampdu_tx *tid_tx,
1010 bool queued = false;
1011 bool reset_agg_timer = false;
1012 struct sk_buff *purge_skb = NULL;
1014 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1015 info->flags |= IEEE80211_TX_CTL_AMPDU;
1016 reset_agg_timer = true;
1017 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1019 * nothing -- this aggregation session is being started
1020 * but that might still fail with the driver
1023 spin_lock(&tx->sta->lock);
1025 * Need to re-check now, because we may get here
1027 * 1) in the window during which the setup is actually
1028 * already done, but not marked yet because not all
1029 * packets are spliced over to the driver pending
1030 * queue yet -- if this happened we acquire the lock
1031 * either before or after the splice happens, but
1032 * need to recheck which of these cases happened.
1034 * 2) during session teardown, if the OPERATIONAL bit
1035 * was cleared due to the teardown but the pointer
1036 * hasn't been assigned NULL yet (or we loaded it
1037 * before it was assigned) -- in this case it may
1038 * now be NULL which means we should just let the
1039 * packet pass through because splicing the frames
1040 * back is already done.
1042 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1045 /* do nothing, let packet pass through */
1046 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1047 info->flags |= IEEE80211_TX_CTL_AMPDU;
1048 reset_agg_timer = true;
1051 info->control.vif = &tx->sdata->vif;
1052 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1053 __skb_queue_tail(&tid_tx->pending, skb);
1054 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1055 purge_skb = __skb_dequeue(&tid_tx->pending);
1057 spin_unlock(&tx->sta->lock);
1060 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1063 /* reset session timer */
1064 if (reset_agg_timer && tid_tx->timeout)
1065 tid_tx->last_tx = jiffies;
1073 static ieee80211_tx_result
1074 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1075 struct ieee80211_tx_data *tx,
1076 struct sk_buff *skb)
1078 struct ieee80211_local *local = sdata->local;
1079 struct ieee80211_hdr *hdr;
1080 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1084 memset(tx, 0, sizeof(*tx));
1088 __skb_queue_head_init(&tx->skbs);
1091 * If this flag is set to true anywhere, and we get here,
1092 * we are doing the needed processing, so remove the flag
1095 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1097 hdr = (struct ieee80211_hdr *) skb->data;
1099 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1100 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1101 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1103 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1104 tx->sdata->control_port_protocol == tx->skb->protocol) {
1105 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1108 tx->sta = sta_info_get(sdata, hdr->addr1);
1110 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1111 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1112 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1113 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1114 struct tid_ampdu_tx *tid_tx;
1116 qc = ieee80211_get_qos_ctl(hdr);
1117 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1119 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1123 queued = ieee80211_tx_prep_agg(tx, skb, info,
1126 if (unlikely(queued))
1131 if (is_multicast_ether_addr(hdr->addr1)) {
1132 tx->flags &= ~IEEE80211_TX_UNICAST;
1133 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1135 tx->flags |= IEEE80211_TX_UNICAST;
1137 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1138 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1139 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1140 info->flags & IEEE80211_TX_CTL_AMPDU)
1141 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1145 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1146 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1147 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1149 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1154 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1155 struct ieee80211_vif *vif,
1156 struct ieee80211_sta *sta,
1157 struct sk_buff_head *skbs,
1160 struct ieee80211_tx_control control;
1161 struct sk_buff *skb, *tmp;
1162 unsigned long flags;
1164 skb_queue_walk_safe(skbs, skb, tmp) {
1165 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1166 int q = info->hw_queue;
1168 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1169 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1170 __skb_unlink(skb, skbs);
1171 ieee80211_free_txskb(&local->hw, skb);
1176 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1177 if (local->queue_stop_reasons[q] ||
1178 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1179 if (unlikely(info->flags &
1180 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1181 if (local->queue_stop_reasons[q] &
1182 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1184 * Drop off-channel frames if queues
1185 * are stopped for any reason other
1186 * than off-channel operation. Never
1189 spin_unlock_irqrestore(
1190 &local->queue_stop_reason_lock,
1192 ieee80211_purge_tx_queue(&local->hw,
1199 * Since queue is stopped, queue up frames for
1200 * later transmission from the tx-pending
1201 * tasklet when the queue is woken again.
1204 skb_queue_splice_init(skbs,
1205 &local->pending[q]);
1207 skb_queue_splice_tail_init(skbs,
1208 &local->pending[q]);
1210 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1215 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1217 info->control.vif = vif;
1220 __skb_unlink(skb, skbs);
1221 drv_tx(local, &control, skb);
1228 * Returns false if the frame couldn't be transmitted but was queued instead.
1230 static bool __ieee80211_tx(struct ieee80211_local *local,
1231 struct sk_buff_head *skbs, int led_len,
1232 struct sta_info *sta, bool txpending)
1234 struct ieee80211_tx_info *info;
1235 struct ieee80211_sub_if_data *sdata;
1236 struct ieee80211_vif *vif;
1237 struct ieee80211_sta *pubsta;
1238 struct sk_buff *skb;
1242 if (WARN_ON(skb_queue_empty(skbs)))
1245 skb = skb_peek(skbs);
1246 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1247 info = IEEE80211_SKB_CB(skb);
1248 sdata = vif_to_sdata(info->control.vif);
1249 if (sta && !sta->uploaded)
1257 switch (sdata->vif.type) {
1258 case NL80211_IFTYPE_MONITOR:
1259 sdata = rcu_dereference(local->monitor_sdata);
1263 vif->hw_queue[skb_get_queue_mapping(skb)];
1264 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1270 case NL80211_IFTYPE_AP_VLAN:
1271 sdata = container_of(sdata->bss,
1272 struct ieee80211_sub_if_data, u.ap);
1279 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1282 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1283 ieee80211_led_tx(local, 1);
1285 WARN_ON_ONCE(!skb_queue_empty(skbs));
1291 * Invoke TX handlers, return 0 on success and non-zero if the
1292 * frame was dropped or queued.
1294 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1296 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1297 ieee80211_tx_result res = TX_DROP;
1299 #define CALL_TXH(txh) \
1302 if (res != TX_CONTINUE) \
1306 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1307 CALL_TXH(ieee80211_tx_h_check_assoc);
1308 CALL_TXH(ieee80211_tx_h_ps_buf);
1309 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1310 CALL_TXH(ieee80211_tx_h_select_key);
1311 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1312 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1314 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1315 __skb_queue_tail(&tx->skbs, tx->skb);
1320 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1321 CALL_TXH(ieee80211_tx_h_sequence);
1322 CALL_TXH(ieee80211_tx_h_fragment);
1323 /* handlers after fragment must be aware of tx info fragmentation! */
1324 CALL_TXH(ieee80211_tx_h_stats);
1325 CALL_TXH(ieee80211_tx_h_encrypt);
1326 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1327 CALL_TXH(ieee80211_tx_h_calculate_duration);
1331 if (unlikely(res == TX_DROP)) {
1332 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1334 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1336 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1338 } else if (unlikely(res == TX_QUEUED)) {
1339 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1347 * Returns false if the frame couldn't be transmitted but was queued instead.
1349 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1350 struct sk_buff *skb, bool txpending,
1351 enum ieee80211_band band)
1353 struct ieee80211_local *local = sdata->local;
1354 struct ieee80211_tx_data tx;
1355 ieee80211_tx_result res_prepare;
1356 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1360 if (unlikely(skb->len < 10)) {
1365 /* initialises tx */
1367 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1369 if (unlikely(res_prepare == TX_DROP)) {
1370 ieee80211_free_txskb(&local->hw, skb);
1372 } else if (unlikely(res_prepare == TX_QUEUED)) {
1378 /* set up hw_queue value early */
1379 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1380 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1382 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1384 if (!invoke_tx_handlers(&tx))
1385 result = __ieee80211_tx(local, &tx.skbs, led_len,
1391 /* device xmit handlers */
1393 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1394 struct sk_buff *skb,
1395 int head_need, bool may_encrypt)
1397 struct ieee80211_local *local = sdata->local;
1400 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1401 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1402 tail_need -= skb_tailroom(skb);
1403 tail_need = max_t(int, tail_need, 0);
1406 if (skb_cloned(skb))
1407 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1408 else if (head_need || tail_need)
1409 I802_DEBUG_INC(local->tx_expand_skb_head);
1413 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1414 wiphy_debug(local->hw.wiphy,
1415 "failed to reallocate TX buffer\n");
1422 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1423 enum ieee80211_band band)
1425 struct ieee80211_local *local = sdata->local;
1426 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1427 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1431 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1433 headroom = local->tx_headroom;
1435 headroom += IEEE80211_ENCRYPT_HEADROOM;
1436 headroom -= skb_headroom(skb);
1437 headroom = max_t(int, 0, headroom);
1439 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1440 ieee80211_free_txskb(&local->hw, skb);
1444 hdr = (struct ieee80211_hdr *) skb->data;
1445 info->control.vif = &sdata->vif;
1447 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1448 if (ieee80211_is_data(hdr->frame_control) &&
1449 is_unicast_ether_addr(hdr->addr1)) {
1450 if (mesh_nexthop_resolve(sdata, skb))
1451 return; /* skb queued: don't free */
1453 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1457 ieee80211_set_qos_hdr(sdata, skb);
1458 ieee80211_tx(sdata, skb, false, band);
1461 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1463 struct ieee80211_radiotap_iterator iterator;
1464 struct ieee80211_radiotap_header *rthdr =
1465 (struct ieee80211_radiotap_header *) skb->data;
1466 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1467 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1471 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1472 IEEE80211_TX_CTL_DONTFRAG;
1475 * for every radiotap entry that is present
1476 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1477 * entries present, or -EINVAL on error)
1481 ret = ieee80211_radiotap_iterator_next(&iterator);
1486 /* see if this argument is something we can use */
1487 switch (iterator.this_arg_index) {
1489 * You must take care when dereferencing iterator.this_arg
1490 * for multibyte types... the pointer is not aligned. Use
1491 * get_unaligned((type *)iterator.this_arg) to dereference
1492 * iterator.this_arg for type "type" safely on all arches.
1494 case IEEE80211_RADIOTAP_FLAGS:
1495 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1497 * this indicates that the skb we have been
1498 * handed has the 32-bit FCS CRC at the end...
1499 * we should react to that by snipping it off
1500 * because it will be recomputed and added
1503 if (skb->len < (iterator._max_length + FCS_LEN))
1506 skb_trim(skb, skb->len - FCS_LEN);
1508 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1509 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1510 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1511 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1514 case IEEE80211_RADIOTAP_TX_FLAGS:
1515 txflags = get_unaligned_le16(iterator.this_arg);
1516 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1517 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1521 * Please update the file
1522 * Documentation/networking/mac80211-injection.txt
1523 * when parsing new fields here.
1531 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1535 * remove the radiotap header
1536 * iterator->_max_length was sanity-checked against
1537 * skb->len by iterator init
1539 skb_pull(skb, iterator._max_length);
1544 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1545 struct net_device *dev)
1547 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1548 struct ieee80211_chanctx_conf *chanctx_conf;
1549 struct ieee80211_channel *chan;
1550 struct ieee80211_radiotap_header *prthdr =
1551 (struct ieee80211_radiotap_header *)skb->data;
1552 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1553 struct ieee80211_hdr *hdr;
1554 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1558 /* check for not even having the fixed radiotap header part */
1559 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1560 goto fail; /* too short to be possibly valid */
1562 /* is it a header version we can trust to find length from? */
1563 if (unlikely(prthdr->it_version))
1564 goto fail; /* only version 0 is supported */
1566 /* then there must be a radiotap header with a length we can use */
1567 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1569 /* does the skb contain enough to deliver on the alleged length? */
1570 if (unlikely(skb->len < len_rthdr))
1571 goto fail; /* skb too short for claimed rt header extent */
1574 * fix up the pointers accounting for the radiotap
1575 * header still being in there. We are being given
1576 * a precooked IEEE80211 header so no need for
1579 skb_set_mac_header(skb, len_rthdr);
1581 * these are just fixed to the end of the rt area since we
1582 * don't have any better information and at this point, nobody cares
1584 skb_set_network_header(skb, len_rthdr);
1585 skb_set_transport_header(skb, len_rthdr);
1587 if (skb->len < len_rthdr + 2)
1590 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1591 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1593 if (skb->len < len_rthdr + hdrlen)
1597 * Initialize skb->protocol if the injected frame is a data frame
1598 * carrying a rfc1042 header
1600 if (ieee80211_is_data(hdr->frame_control) &&
1601 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1602 u8 *payload = (u8 *)hdr + hdrlen;
1604 if (ether_addr_equal(payload, rfc1042_header))
1605 skb->protocol = cpu_to_be16((payload[6] << 8) |
1609 memset(info, 0, sizeof(*info));
1611 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1612 IEEE80211_TX_CTL_INJECTED;
1614 /* process and remove the injection radiotap header */
1615 if (!ieee80211_parse_tx_radiotap(skb))
1621 * We process outgoing injected frames that have a local address
1622 * we handle as though they are non-injected frames.
1623 * This code here isn't entirely correct, the local MAC address
1624 * isn't always enough to find the interface to use; for proper
1625 * VLAN/WDS support we will need a different mechanism (which
1626 * likely isn't going to be monitor interfaces).
1628 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1630 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1631 if (!ieee80211_sdata_running(tmp_sdata))
1633 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1634 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1635 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1637 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1643 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1644 if (!chanctx_conf) {
1645 tmp_sdata = rcu_dereference(local->monitor_sdata);
1648 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1652 chan = chanctx_conf->def.chan;
1653 else if (!local->use_chanctx)
1654 chan = local->_oper_chandef.chan;
1659 * Frame injection is not allowed if beaconing is not allowed
1660 * or if we need radar detection. Beaconing is usually not allowed when
1661 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1662 * Passive scan is also used in world regulatory domains where
1663 * your country is not known and as such it should be treated as
1664 * NO TX unless the channel is explicitly allowed in which case
1665 * your current regulatory domain would not have the passive scan
1668 * Since AP mode uses monitor interfaces to inject/TX management
1669 * frames we can make AP mode the exception to this rule once it
1670 * supports radar detection as its implementation can deal with
1671 * radar detection by itself. We can do that later by adding a
1672 * monitor flag interfaces used for AP support.
1674 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1675 IEEE80211_CHAN_PASSIVE_SCAN)))
1678 ieee80211_xmit(sdata, skb, chan->band);
1681 return NETDEV_TX_OK;
1687 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1691 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1692 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1693 * @skb: packet to be sent
1694 * @dev: incoming interface
1696 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1697 * not be freed, and caller is responsible for either retrying later or freeing
1700 * This function takes in an Ethernet header and encapsulates it with suitable
1701 * IEEE 802.11 header based on which interface the packet is coming in. The
1702 * encapsulated packet will then be passed to master interface, wlan#.11, for
1703 * transmission (through low-level driver).
1705 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1706 struct net_device *dev)
1708 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1709 struct ieee80211_local *local = sdata->local;
1710 struct ieee80211_tx_info *info;
1712 u16 ethertype, hdrlen, meshhdrlen = 0;
1714 struct ieee80211_hdr hdr;
1715 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1716 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1717 const u8 *encaps_data;
1718 int encaps_len, skip_header_bytes;
1720 struct sta_info *sta = NULL;
1721 bool wme_sta = false, authorized = false, tdls_auth = false;
1722 bool tdls_direct = false;
1726 struct ieee80211_chanctx_conf *chanctx_conf;
1727 struct ieee80211_sub_if_data *ap_sdata;
1728 enum ieee80211_band band;
1730 if (unlikely(skb->len < ETH_HLEN))
1733 /* convert Ethernet header to proper 802.11 header (based on
1734 * operation mode) */
1735 ethertype = (skb->data[12] << 8) | skb->data[13];
1736 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1740 switch (sdata->vif.type) {
1741 case NL80211_IFTYPE_AP_VLAN:
1742 sta = rcu_dereference(sdata->u.vlan.sta);
1744 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1746 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1747 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1748 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1749 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1751 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1752 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1754 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1756 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1759 band = chanctx_conf->def.chan->band;
1763 case NL80211_IFTYPE_AP:
1764 if (sdata->vif.type == NL80211_IFTYPE_AP)
1765 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1768 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1770 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1771 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1772 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1774 band = chanctx_conf->def.chan->band;
1776 case NL80211_IFTYPE_WDS:
1777 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1779 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1780 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1781 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1782 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1785 * This is the exception! WDS style interfaces are prohibited
1786 * when channel contexts are in used so this must be valid
1788 band = local->hw.conf.chandef.chan->band;
1790 #ifdef CONFIG_MAC80211_MESH
1791 case NL80211_IFTYPE_MESH_POINT:
1792 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1793 /* Do not send frames with mesh_ttl == 0 */
1794 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1798 if (!is_multicast_ether_addr(skb->data)) {
1799 struct sta_info *next_hop;
1800 bool mpp_lookup = true;
1802 mpath = mesh_path_lookup(sdata, skb->data);
1805 next_hop = rcu_dereference(mpath->next_hop);
1807 !(mpath->flags & (MESH_PATH_ACTIVE |
1808 MESH_PATH_RESOLVING)))
1813 mppath = mpp_path_lookup(sdata, skb->data);
1815 if (mppath && mpath)
1816 mesh_path_del(mpath->sdata, mpath->dst);
1820 * Use address extension if it is a packet from
1821 * another interface or if we know the destination
1822 * is being proxied by a portal (i.e. portal address
1823 * differs from proxied address)
1825 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1826 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1827 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1828 skb->data, skb->data + ETH_ALEN);
1829 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1832 /* DS -> MBSS (802.11-2012 13.11.3.3).
1833 * For unicast with unknown forwarding information,
1834 * destination might be in the MBSS or if that fails
1835 * forwarded to another mesh gate. In either case
1836 * resolution will be handled in ieee80211_xmit(), so
1837 * leave the original DA. This also works for mcast */
1838 const u8 *mesh_da = skb->data;
1841 mesh_da = mppath->mpp;
1843 mesh_da = mpath->dst;
1845 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1846 mesh_da, sdata->vif.addr);
1847 if (is_multicast_ether_addr(mesh_da))
1848 /* DA TA mSA AE:SA */
1849 meshhdrlen = ieee80211_new_mesh_header(
1851 skb->data + ETH_ALEN, NULL);
1853 /* RA TA mDA mSA AE:DA SA */
1854 meshhdrlen = ieee80211_new_mesh_header(
1855 sdata, &mesh_hdr, skb->data,
1856 skb->data + ETH_ALEN);
1859 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1862 band = chanctx_conf->def.chan->band;
1865 case NL80211_IFTYPE_STATION:
1866 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1867 bool tdls_peer = false;
1869 sta = sta_info_get(sdata, skb->data);
1871 authorized = test_sta_flag(sta,
1872 WLAN_STA_AUTHORIZED);
1873 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1874 tdls_peer = test_sta_flag(sta,
1875 WLAN_STA_TDLS_PEER);
1876 tdls_auth = test_sta_flag(sta,
1877 WLAN_STA_TDLS_PEER_AUTH);
1881 * If the TDLS link is enabled, send everything
1882 * directly. Otherwise, allow TDLS setup frames
1883 * to be transmitted indirectly.
1885 tdls_direct = tdls_peer && (tdls_auth ||
1886 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1887 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1891 /* link during setup - throw out frames to peer */
1896 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1897 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1898 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1900 } else if (sdata->u.mgd.use_4addr &&
1901 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1902 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1903 IEEE80211_FCTL_TODS);
1905 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1906 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1907 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1908 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1911 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1913 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1914 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1915 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1918 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1921 band = chanctx_conf->def.chan->band;
1923 case NL80211_IFTYPE_ADHOC:
1925 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1926 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1927 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1929 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1932 band = chanctx_conf->def.chan->band;
1939 * There's no need to try to look up the destination
1940 * if it is a multicast address (which can only happen
1943 multicast = is_multicast_ether_addr(hdr.addr1);
1945 sta = sta_info_get(sdata, hdr.addr1);
1947 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1948 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1952 /* For mesh, the use of the QoS header is mandatory */
1953 if (ieee80211_vif_is_mesh(&sdata->vif))
1956 /* receiver and we are QoS enabled, use a QoS type frame */
1957 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1958 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1963 * Drop unicast frames to unauthorised stations unless they are
1964 * EAPOL frames from the local station.
1966 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1967 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1968 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1969 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1970 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1971 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1972 dev->name, hdr.addr1);
1975 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1980 if (unlikely(!multicast && skb->sk &&
1981 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1982 struct sk_buff *orig_skb = skb;
1984 skb = skb_clone(skb, GFP_ATOMIC);
1986 unsigned long flags;
1989 spin_lock_irqsave(&local->ack_status_lock, flags);
1990 id = idr_alloc(&local->ack_status_frames, orig_skb,
1991 1, 0x10000, GFP_ATOMIC);
1992 spin_unlock_irqrestore(&local->ack_status_lock, flags);
1996 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1997 } else if (skb_shared(skb)) {
1998 kfree_skb(orig_skb);
2004 /* couldn't clone -- lose tx status ... */
2010 * If the skb is shared we need to obtain our own copy.
2012 if (skb_shared(skb)) {
2013 struct sk_buff *tmp_skb = skb;
2015 /* can't happen -- skb is a clone if info_id != 0 */
2018 skb = skb_clone(skb, GFP_ATOMIC);
2025 hdr.frame_control = fc;
2026 hdr.duration_id = 0;
2029 skip_header_bytes = ETH_HLEN;
2030 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2031 encaps_data = bridge_tunnel_header;
2032 encaps_len = sizeof(bridge_tunnel_header);
2033 skip_header_bytes -= 2;
2034 } else if (ethertype >= ETH_P_802_3_MIN) {
2035 encaps_data = rfc1042_header;
2036 encaps_len = sizeof(rfc1042_header);
2037 skip_header_bytes -= 2;
2043 nh_pos = skb_network_header(skb) - skb->data;
2044 h_pos = skb_transport_header(skb) - skb->data;
2046 skb_pull(skb, skip_header_bytes);
2047 nh_pos -= skip_header_bytes;
2048 h_pos -= skip_header_bytes;
2050 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2053 * So we need to modify the skb header and hence need a copy of
2054 * that. The head_need variable above doesn't, so far, include
2055 * the needed header space that we don't need right away. If we
2056 * can, then we don't reallocate right now but only after the
2057 * frame arrives at the master device (if it does...)
2059 * If we cannot, however, then we will reallocate to include all
2060 * the ever needed space. Also, if we need to reallocate it anyway,
2061 * make it big enough for everything we may ever need.
2064 if (head_need > 0 || skb_cloned(skb)) {
2065 head_need += IEEE80211_ENCRYPT_HEADROOM;
2066 head_need += local->tx_headroom;
2067 head_need = max_t(int, 0, head_need);
2068 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2069 ieee80211_free_txskb(&local->hw, skb);
2076 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2077 nh_pos += encaps_len;
2078 h_pos += encaps_len;
2081 #ifdef CONFIG_MAC80211_MESH
2082 if (meshhdrlen > 0) {
2083 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2084 nh_pos += meshhdrlen;
2085 h_pos += meshhdrlen;
2089 if (ieee80211_is_data_qos(fc)) {
2090 __le16 *qos_control;
2092 qos_control = (__le16*) skb_push(skb, 2);
2093 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2095 * Maybe we could actually set some fields here, for now just
2096 * initialise to zero to indicate no special operation.
2100 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2105 dev->stats.tx_packets++;
2106 dev->stats.tx_bytes += skb->len;
2108 /* Update skb pointers to various headers since this modified frame
2109 * is going to go through Linux networking code that may potentially
2110 * need things like pointer to IP header. */
2111 skb_set_mac_header(skb, 0);
2112 skb_set_network_header(skb, nh_pos);
2113 skb_set_transport_header(skb, h_pos);
2115 info = IEEE80211_SKB_CB(skb);
2116 memset(info, 0, sizeof(*info));
2118 dev->trans_start = jiffies;
2120 info->flags = info_flags;
2121 info->ack_frame_id = info_id;
2123 ieee80211_xmit(sdata, skb, band);
2126 return NETDEV_TX_OK;
2132 return NETDEV_TX_OK;
2137 * ieee80211_clear_tx_pending may not be called in a context where
2138 * it is possible that it packets could come in again.
2140 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2142 struct sk_buff *skb;
2145 for (i = 0; i < local->hw.queues; i++) {
2146 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2147 ieee80211_free_txskb(&local->hw, skb);
2152 * Returns false if the frame couldn't be transmitted but was queued instead,
2153 * which in this case means re-queued -- take as an indication to stop sending
2154 * more pending frames.
2156 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2157 struct sk_buff *skb)
2159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2160 struct ieee80211_sub_if_data *sdata;
2161 struct sta_info *sta;
2162 struct ieee80211_hdr *hdr;
2164 struct ieee80211_chanctx_conf *chanctx_conf;
2166 sdata = vif_to_sdata(info->control.vif);
2168 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2169 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2170 if (unlikely(!chanctx_conf)) {
2174 result = ieee80211_tx(sdata, skb, true,
2175 chanctx_conf->def.chan->band);
2177 struct sk_buff_head skbs;
2179 __skb_queue_head_init(&skbs);
2180 __skb_queue_tail(&skbs, skb);
2182 hdr = (struct ieee80211_hdr *)skb->data;
2183 sta = sta_info_get(sdata, hdr->addr1);
2185 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2192 * Transmit all pending packets. Called from tasklet.
2194 void ieee80211_tx_pending(unsigned long data)
2196 struct ieee80211_local *local = (struct ieee80211_local *)data;
2197 unsigned long flags;
2203 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2204 for (i = 0; i < local->hw.queues; i++) {
2206 * If queue is stopped by something other than due to pending
2207 * frames, or we have no pending frames, proceed to next queue.
2209 if (local->queue_stop_reasons[i] ||
2210 skb_queue_empty(&local->pending[i]))
2213 while (!skb_queue_empty(&local->pending[i])) {
2214 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2215 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2217 if (WARN_ON(!info->control.vif)) {
2218 ieee80211_free_txskb(&local->hw, skb);
2222 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2225 txok = ieee80211_tx_pending_skb(local, skb);
2226 spin_lock_irqsave(&local->queue_stop_reason_lock,
2232 if (skb_queue_empty(&local->pending[i]))
2233 ieee80211_propagate_queue_wake(local, i);
2235 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2240 /* functions for drivers to get certain frames */
2242 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2243 struct ps_data *ps, struct sk_buff *skb)
2247 int i, have_bits = 0, n1, n2;
2249 /* Generate bitmap for TIM only if there are any STAs in power save
2251 if (atomic_read(&ps->num_sta_ps) > 0)
2252 /* in the hope that this is faster than
2253 * checking byte-for-byte */
2254 have_bits = !bitmap_empty((unsigned long*)ps->tim,
2255 IEEE80211_MAX_AID+1);
2257 if (ps->dtim_count == 0)
2258 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2262 tim = pos = (u8 *) skb_put(skb, 6);
2263 *pos++ = WLAN_EID_TIM;
2265 *pos++ = ps->dtim_count;
2266 *pos++ = sdata->vif.bss_conf.dtim_period;
2268 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2271 ps->dtim_bc_mc = aid0 == 1;
2274 /* Find largest even number N1 so that bits numbered 1 through
2275 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2276 * (N2 + 1) x 8 through 2007 are 0. */
2278 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2285 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2292 /* Bitmap control */
2294 /* Part Virt Bitmap */
2295 skb_put(skb, n2 - n1);
2296 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2298 tim[1] = n2 - n1 + 4;
2300 *pos++ = aid0; /* Bitmap control */
2301 *pos++ = 0; /* Part Virt Bitmap */
2305 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2306 struct ps_data *ps, struct sk_buff *skb)
2308 struct ieee80211_local *local = sdata->local;
2311 * Not very nice, but we want to allow the driver to call
2312 * ieee80211_beacon_get() as a response to the set_tim()
2313 * callback. That, however, is already invoked under the
2314 * sta_lock to guarantee consistent and race-free update
2315 * of the tim bitmap in mac80211 and the driver.
2317 if (local->tim_in_locked_section) {
2318 __ieee80211_beacon_add_tim(sdata, ps, skb);
2320 spin_lock_bh(&local->tim_lock);
2321 __ieee80211_beacon_add_tim(sdata, ps, skb);
2322 spin_unlock_bh(&local->tim_lock);
2328 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2329 struct ieee80211_vif *vif,
2330 u16 *tim_offset, u16 *tim_length)
2332 struct ieee80211_local *local = hw_to_local(hw);
2333 struct sk_buff *skb = NULL;
2334 struct ieee80211_tx_info *info;
2335 struct ieee80211_sub_if_data *sdata = NULL;
2336 enum ieee80211_band band;
2337 struct ieee80211_tx_rate_control txrc;
2338 struct ieee80211_chanctx_conf *chanctx_conf;
2342 sdata = vif_to_sdata(vif);
2343 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2345 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2353 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2354 struct ieee80211_if_ap *ap = &sdata->u.ap;
2355 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2359 * headroom, head length,
2360 * tail length and maximum TIM length
2362 skb = dev_alloc_skb(local->tx_headroom +
2364 beacon->tail_len + 256);
2368 skb_reserve(skb, local->tx_headroom);
2369 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2372 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2375 *tim_offset = beacon->head_len;
2377 *tim_length = skb->len - beacon->head_len;
2380 memcpy(skb_put(skb, beacon->tail_len),
2381 beacon->tail, beacon->tail_len);
2384 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2385 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2386 struct ieee80211_hdr *hdr;
2387 struct beacon_data *presp = rcu_dereference(ifibss->presp);
2392 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
2395 skb_reserve(skb, local->tx_headroom);
2396 memcpy(skb_put(skb, presp->head_len), presp->head,
2399 hdr = (struct ieee80211_hdr *) skb->data;
2400 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2401 IEEE80211_STYPE_BEACON);
2402 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2403 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2404 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
2409 if (ifmsh->sync_ops)
2410 ifmsh->sync_ops->adjust_tbtt(
2413 skb = dev_alloc_skb(local->tx_headroom +
2419 skb_reserve(skb, local->tx_headroom);
2420 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2421 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2422 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
2428 band = chanctx_conf->def.chan->band;
2430 info = IEEE80211_SKB_CB(skb);
2432 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2433 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2436 memset(&txrc, 0, sizeof(txrc));
2438 txrc.sband = local->hw.wiphy->bands[band];
2439 txrc.bss_conf = &sdata->vif.bss_conf;
2441 txrc.reported_rate.idx = -1;
2442 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2443 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2444 txrc.max_rate_idx = -1;
2446 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2448 rate_control_get_rate(sdata, NULL, &txrc);
2450 info->control.vif = vif;
2452 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2453 IEEE80211_TX_CTL_ASSIGN_SEQ |
2454 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2459 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2461 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2462 struct ieee80211_vif *vif)
2464 struct ieee80211_if_ap *ap = NULL;
2465 struct sk_buff *skb = NULL;
2466 struct probe_resp *presp = NULL;
2467 struct ieee80211_hdr *hdr;
2468 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2470 if (sdata->vif.type != NL80211_IFTYPE_AP)
2476 presp = rcu_dereference(ap->probe_resp);
2480 skb = dev_alloc_skb(presp->len);
2484 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2486 hdr = (struct ieee80211_hdr *) skb->data;
2487 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2493 EXPORT_SYMBOL(ieee80211_proberesp_get);
2495 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2496 struct ieee80211_vif *vif)
2498 struct ieee80211_sub_if_data *sdata;
2499 struct ieee80211_if_managed *ifmgd;
2500 struct ieee80211_pspoll *pspoll;
2501 struct ieee80211_local *local;
2502 struct sk_buff *skb;
2504 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2507 sdata = vif_to_sdata(vif);
2508 ifmgd = &sdata->u.mgd;
2509 local = sdata->local;
2511 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2515 skb_reserve(skb, local->hw.extra_tx_headroom);
2517 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2518 memset(pspoll, 0, sizeof(*pspoll));
2519 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2520 IEEE80211_STYPE_PSPOLL);
2521 pspoll->aid = cpu_to_le16(ifmgd->aid);
2523 /* aid in PS-Poll has its two MSBs each set to 1 */
2524 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2526 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2527 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2531 EXPORT_SYMBOL(ieee80211_pspoll_get);
2533 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2534 struct ieee80211_vif *vif)
2536 struct ieee80211_hdr_3addr *nullfunc;
2537 struct ieee80211_sub_if_data *sdata;
2538 struct ieee80211_if_managed *ifmgd;
2539 struct ieee80211_local *local;
2540 struct sk_buff *skb;
2542 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2545 sdata = vif_to_sdata(vif);
2546 ifmgd = &sdata->u.mgd;
2547 local = sdata->local;
2549 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2553 skb_reserve(skb, local->hw.extra_tx_headroom);
2555 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2557 memset(nullfunc, 0, sizeof(*nullfunc));
2558 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2559 IEEE80211_STYPE_NULLFUNC |
2560 IEEE80211_FCTL_TODS);
2561 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2562 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2563 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2567 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2569 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2570 struct ieee80211_vif *vif,
2571 const u8 *ssid, size_t ssid_len,
2574 struct ieee80211_sub_if_data *sdata;
2575 struct ieee80211_local *local;
2576 struct ieee80211_hdr_3addr *hdr;
2577 struct sk_buff *skb;
2581 sdata = vif_to_sdata(vif);
2582 local = sdata->local;
2583 ie_ssid_len = 2 + ssid_len;
2585 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2586 ie_ssid_len + tailroom);
2590 skb_reserve(skb, local->hw.extra_tx_headroom);
2592 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2593 memset(hdr, 0, sizeof(*hdr));
2594 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2595 IEEE80211_STYPE_PROBE_REQ);
2596 eth_broadcast_addr(hdr->addr1);
2597 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2598 eth_broadcast_addr(hdr->addr3);
2600 pos = skb_put(skb, ie_ssid_len);
2601 *pos++ = WLAN_EID_SSID;
2604 memcpy(pos, ssid, ssid_len);
2609 EXPORT_SYMBOL(ieee80211_probereq_get);
2611 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2612 const void *frame, size_t frame_len,
2613 const struct ieee80211_tx_info *frame_txctl,
2614 struct ieee80211_rts *rts)
2616 const struct ieee80211_hdr *hdr = frame;
2618 rts->frame_control =
2619 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2620 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2622 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2623 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2625 EXPORT_SYMBOL(ieee80211_rts_get);
2627 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2628 const void *frame, size_t frame_len,
2629 const struct ieee80211_tx_info *frame_txctl,
2630 struct ieee80211_cts *cts)
2632 const struct ieee80211_hdr *hdr = frame;
2634 cts->frame_control =
2635 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2636 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2637 frame_len, frame_txctl);
2638 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2640 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2643 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2644 struct ieee80211_vif *vif)
2646 struct ieee80211_local *local = hw_to_local(hw);
2647 struct sk_buff *skb = NULL;
2648 struct ieee80211_tx_data tx;
2649 struct ieee80211_sub_if_data *sdata;
2651 struct ieee80211_tx_info *info;
2652 struct ieee80211_chanctx_conf *chanctx_conf;
2654 sdata = vif_to_sdata(vif);
2657 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2662 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2663 struct beacon_data *beacon =
2664 rcu_dereference(sdata->u.ap.beacon);
2666 if (!beacon || !beacon->head)
2669 ps = &sdata->u.ap.ps;
2670 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2671 ps = &sdata->u.mesh.ps;
2676 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2677 goto out; /* send buffered bc/mc only after DTIM beacon */
2680 skb = skb_dequeue(&ps->bc_buf);
2683 local->total_ps_buffered--;
2685 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2686 struct ieee80211_hdr *hdr =
2687 (struct ieee80211_hdr *) skb->data;
2688 /* more buffered multicast/broadcast frames ==> set
2689 * MoreData flag in IEEE 802.11 header to inform PS
2691 hdr->frame_control |=
2692 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2695 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2696 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
2697 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2699 dev_kfree_skb_any(skb);
2702 info = IEEE80211_SKB_CB(skb);
2704 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2705 info->band = chanctx_conf->def.chan->band;
2707 if (invoke_tx_handlers(&tx))
2714 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2716 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2717 struct sk_buff *skb, int tid,
2718 enum ieee80211_band band)
2720 int ac = ieee802_1d_to_ac[tid & 7];
2722 skb_set_mac_header(skb, 0);
2723 skb_set_network_header(skb, 0);
2724 skb_set_transport_header(skb, 0);
2726 skb_set_queue_mapping(skb, ac);
2727 skb->priority = tid;
2729 skb->dev = sdata->dev;
2732 * The other path calling ieee80211_xmit is from the tasklet,
2733 * and while we can handle concurrent transmissions locking
2734 * requirements are that we do not come into tx with bhs on.
2737 ieee80211_xmit(sdata, skb, band);