2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
40 struct sk_buff *skb, int group_addr,
43 int rate, mrate, erp, dur, i, shift = 0;
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);
49 struct ieee80211_chanctx_conf *chanctx_conf;
53 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
55 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
56 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
60 /* assume HW handles this */
61 if (tx->rate.flags & IEEE80211_TX_RC_MCS)
65 if (WARN_ON_ONCE(tx->rate.idx < 0))
68 sband = local->hw.wiphy->bands[info->band];
69 txrate = &sband->bitrates[tx->rate.idx];
71 erp = txrate->flags & IEEE80211_RATE_ERP_G;
74 * data and mgmt (except PS Poll):
76 * - during contention period:
77 * if addr1 is group address: 0
78 * if more fragments = 0 and addr1 is individual address: time to
79 * transmit one ACK plus SIFS
80 * if more fragments = 1 and addr1 is individual address: time to
81 * transmit next fragment plus 2 x ACK plus 3 x SIFS
84 * - control response frame (CTS or ACK) shall be transmitted using the
85 * same rate as the immediately previous frame in the frame exchange
86 * sequence, if this rate belongs to the PHY mandatory rates, or else
87 * at the highest possible rate belonging to the PHY rates in the
90 hdr = (struct ieee80211_hdr *)skb->data;
91 if (ieee80211_is_ctl(hdr->frame_control)) {
92 /* TODO: These control frames are not currently sent by
93 * mac80211, but should they be implemented, this function
94 * needs to be updated to support duration field calculation.
96 * RTS: time needed to transmit pending data/mgmt frame plus
97 * one CTS frame plus one ACK frame plus 3 x SIFS
98 * CTS: duration of immediately previous RTS minus time
99 * required to transmit CTS and its SIFS
100 * ACK: 0 if immediately previous directed data/mgmt had
101 * more=0, with more=1 duration in ACK frame is duration
102 * from previous frame minus time needed to transmit ACK
104 * PS Poll: BIT(15) | BIT(14) | aid
110 if (0 /* FIX: data/mgmt during CFP */)
111 return cpu_to_le16(32768);
113 if (group_addr) /* Group address as the destination - no ACK */
116 /* Individual destination address:
117 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
118 * CTS and ACK frames shall be transmitted using the highest rate in
119 * basic rate set that is less than or equal to the rate of the
120 * immediately previous frame and that is using the same modulation
121 * (CCK or OFDM). If no basic rate set matches with these requirements,
122 * the highest mandatory rate of the PHY that is less than or equal to
123 * the rate of the previous frame is used.
124 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
127 /* use lowest available if everything fails */
128 mrate = sband->bitrates[0].bitrate;
129 for (i = 0; i < sband->n_bitrates; i++) {
130 struct ieee80211_rate *r = &sband->bitrates[i];
132 if (r->bitrate > txrate->bitrate)
135 if ((rate_flags & r->flags) != rate_flags)
138 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
139 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
141 switch (sband->band) {
142 case IEEE80211_BAND_2GHZ: {
144 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
145 flag = IEEE80211_RATE_MANDATORY_G;
147 flag = IEEE80211_RATE_MANDATORY_B;
152 case IEEE80211_BAND_5GHZ:
153 if (r->flags & IEEE80211_RATE_MANDATORY_A)
156 case IEEE80211_BAND_60GHZ:
157 /* TODO, for now fall through */
158 case IEEE80211_NUM_BANDS:
164 /* No matching basic rate found; use highest suitable mandatory
166 rate = DIV_ROUND_UP(mrate, 1 << shift);
169 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
170 if (ieee80211_is_data_qos(hdr->frame_control) &&
171 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
174 /* Time needed to transmit ACK
175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
176 * to closest integer */
177 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
178 tx->sdata->vif.bss_conf.use_short_preamble,
182 /* Frame is fragmented: duration increases with time needed to
183 * transmit next fragment plus ACK and 2 x SIFS. */
184 dur *= 2; /* ACK + SIFS */
186 dur += ieee80211_frame_duration(sband->band, next_frag_len,
187 txrate->bitrate, erp,
188 tx->sdata->vif.bss_conf.use_short_preamble,
192 return cpu_to_le16(dur);
196 static ieee80211_tx_result debug_noinline
197 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
199 struct ieee80211_local *local = tx->local;
200 struct ieee80211_if_managed *ifmgd;
202 /* driver doesn't support power save */
203 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
206 /* hardware does dynamic power save */
207 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
210 /* dynamic power save disabled */
211 if (local->hw.conf.dynamic_ps_timeout <= 0)
214 /* we are scanning, don't enable power save */
218 if (!local->ps_sdata)
221 /* No point if we're going to suspend */
222 if (local->quiescing)
225 /* dynamic ps is supported only in managed mode */
226 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
229 ifmgd = &tx->sdata->u.mgd;
232 * Don't wakeup from power save if u-apsd is enabled, voip ac has
233 * u-apsd enabled and the frame is in voip class. This effectively
234 * means that even if all access categories have u-apsd enabled, in
235 * practise u-apsd is only used with the voip ac. This is a
236 * workaround for the case when received voip class packets do not
237 * have correct qos tag for some reason, due the network or the
240 * Note: ifmgd->uapsd_queues access is racy here. If the value is
241 * changed via debugfs, user needs to reassociate manually to have
242 * everything in sync.
244 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
245 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
246 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
249 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
250 ieee80211_stop_queues_by_reason(&local->hw,
251 IEEE80211_MAX_QUEUE_MAP,
252 IEEE80211_QUEUE_STOP_REASON_PS);
253 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
254 ieee80211_queue_work(&local->hw,
255 &local->dynamic_ps_disable_work);
258 /* Don't restart the timer if we're not disassociated */
259 if (!ifmgd->associated)
262 mod_timer(&local->dynamic_ps_timer, jiffies +
263 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
268 static ieee80211_tx_result debug_noinline
269 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
272 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
273 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
276 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
279 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
280 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
281 !ieee80211_is_probe_req(hdr->frame_control) &&
282 !ieee80211_is_nullfunc(hdr->frame_control))
284 * When software scanning only nullfunc frames (to notify
285 * the sleep state to the AP) and probe requests (for the
286 * active scan) are allowed, all other frames should not be
287 * sent and we should not get here, but if we do
288 * nonetheless, drop them to avoid sending them
289 * off-channel. See the link below and
290 * ieee80211_start_scan() for more.
292 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
296 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
299 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
302 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
306 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
308 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
309 if (unlikely(!assoc &&
310 ieee80211_is_data(hdr->frame_control))) {
311 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
312 sdata_info(tx->sdata,
313 "dropped data frame to not associated station %pM\n",
316 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
319 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
320 ieee80211_is_data(hdr->frame_control) &&
321 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
323 * No associated STAs - no need to send multicast
332 /* This function is called whenever the AP is about to exceed the maximum limit
333 * of buffered frames for power saving STAs. This situation should not really
334 * happen often during normal operation, so dropping the oldest buffered packet
335 * from each queue should be OK to make some room for new frames. */
336 static void purge_old_ps_buffers(struct ieee80211_local *local)
338 int total = 0, purged = 0;
340 struct ieee80211_sub_if_data *sdata;
341 struct sta_info *sta;
343 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
346 if (sdata->vif.type == NL80211_IFTYPE_AP)
347 ps = &sdata->u.ap.ps;
348 else if (ieee80211_vif_is_mesh(&sdata->vif))
349 ps = &sdata->u.mesh.ps;
353 skb = skb_dequeue(&ps->bc_buf);
358 total += skb_queue_len(&ps->bc_buf);
362 * Drop one frame from each station from the lowest-priority
363 * AC that has frames at all.
365 list_for_each_entry_rcu(sta, &local->sta_list, list) {
368 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
369 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
370 total += skb_queue_len(&sta->ps_tx_buf[ac]);
373 ieee80211_free_txskb(&local->hw, skb);
379 local->total_ps_buffered = total;
380 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
383 static ieee80211_tx_result
384 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
386 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
387 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
391 * broadcast/multicast frame
393 * If any of the associated/peer stations is in power save mode,
394 * the frame is buffered to be sent after DTIM beacon frame.
395 * This is done either by the hardware or us.
398 /* powersaving STAs currently only in AP/VLAN/mesh mode */
399 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
400 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
404 ps = &tx->sdata->bss->ps;
405 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
406 ps = &tx->sdata->u.mesh.ps;
412 /* no buffering for ordered frames */
413 if (ieee80211_has_order(hdr->frame_control))
416 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
417 info->hw_queue = tx->sdata->vif.cab_queue;
419 /* no stations in PS mode */
420 if (!atomic_read(&ps->num_sta_ps))
423 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
425 /* device releases frame after DTIM beacon */
426 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
429 /* buffered in mac80211 */
430 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
431 purge_old_ps_buffers(tx->local);
433 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
435 "BC TX buffer full - dropping the oldest frame\n");
436 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
438 tx->local->total_ps_buffered++;
440 skb_queue_tail(&ps->bc_buf, tx->skb);
445 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
448 if (!ieee80211_is_mgmt(fc))
451 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
454 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
461 static ieee80211_tx_result
462 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
464 struct sta_info *sta = tx->sta;
465 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
466 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
467 struct ieee80211_local *local = tx->local;
472 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
473 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
474 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
475 int ac = skb_get_queue_mapping(tx->skb);
477 /* only deauth, disassoc and action are bufferable MMPDUs */
478 if (ieee80211_is_mgmt(hdr->frame_control) &&
479 !ieee80211_is_deauth(hdr->frame_control) &&
480 !ieee80211_is_disassoc(hdr->frame_control) &&
481 !ieee80211_is_action(hdr->frame_control)) {
482 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
486 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
487 sta->sta.addr, sta->sta.aid, ac);
488 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
489 purge_old_ps_buffers(tx->local);
490 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
491 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
493 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
495 ieee80211_free_txskb(&local->hw, old);
497 tx->local->total_ps_buffered++;
499 info->control.jiffies = jiffies;
500 info->control.vif = &tx->sdata->vif;
501 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
502 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
504 if (!timer_pending(&local->sta_cleanup))
505 mod_timer(&local->sta_cleanup,
506 round_jiffies(jiffies +
507 STA_INFO_CLEANUP_INTERVAL));
510 * We queued up some frames, so the TIM bit might
511 * need to be set, recalculate it.
513 sta_info_recalc_tim(sta);
516 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
518 "STA %pM in PS mode, but polling/in SP -> send frame\n",
525 static ieee80211_tx_result debug_noinline
526 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
528 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
531 if (tx->flags & IEEE80211_TX_UNICAST)
532 return ieee80211_tx_h_unicast_ps_buf(tx);
534 return ieee80211_tx_h_multicast_ps_buf(tx);
537 static ieee80211_tx_result debug_noinline
538 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
540 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
542 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
543 if (tx->sdata->control_port_no_encrypt)
544 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
545 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
551 static ieee80211_tx_result debug_noinline
552 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
554 struct ieee80211_key *key;
555 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
556 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
558 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
560 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
562 else if (ieee80211_is_mgmt(hdr->frame_control) &&
563 is_multicast_ether_addr(hdr->addr1) &&
564 ieee80211_is_robust_mgmt_frame(hdr) &&
565 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
567 else if (is_multicast_ether_addr(hdr->addr1) &&
568 (key = rcu_dereference(tx->sdata->default_multicast_key)))
570 else if (!is_multicast_ether_addr(hdr->addr1) &&
571 (key = rcu_dereference(tx->sdata->default_unicast_key)))
573 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
575 else if (!tx->sdata->drop_unencrypted)
577 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
579 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
580 !(ieee80211_is_action(hdr->frame_control) &&
581 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
583 else if (ieee80211_is_mgmt(hdr->frame_control) &&
584 !ieee80211_is_robust_mgmt_frame(hdr))
587 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
592 bool skip_hw = false;
594 tx->key->tx_rx_count++;
595 /* TODO: add threshold stuff again */
597 switch (tx->key->conf.cipher) {
598 case WLAN_CIPHER_SUITE_WEP40:
599 case WLAN_CIPHER_SUITE_WEP104:
600 case WLAN_CIPHER_SUITE_TKIP:
601 if (!ieee80211_is_data_present(hdr->frame_control))
604 case WLAN_CIPHER_SUITE_CCMP:
605 if (!ieee80211_is_data_present(hdr->frame_control) &&
606 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
610 skip_hw = (tx->key->conf.flags &
611 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
612 ieee80211_is_mgmt(hdr->frame_control);
614 case WLAN_CIPHER_SUITE_AES_CMAC:
615 if (!ieee80211_is_mgmt(hdr->frame_control))
620 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
621 !ieee80211_is_deauth(hdr->frame_control)))
624 if (!skip_hw && tx->key &&
625 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
626 info->control.hw_key = &tx->key->conf;
632 static ieee80211_tx_result debug_noinline
633 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
635 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
636 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
637 struct ieee80211_supported_band *sband;
639 struct ieee80211_tx_rate_control txrc;
640 struct ieee80211_sta_rates *ratetbl = NULL;
643 memset(&txrc, 0, sizeof(txrc));
645 sband = tx->local->hw.wiphy->bands[info->band];
647 len = min_t(u32, tx->skb->len + FCS_LEN,
648 tx->local->hw.wiphy->frag_threshold);
650 /* set up the tx rate control struct we give the RC algo */
651 txrc.hw = &tx->local->hw;
653 txrc.bss_conf = &tx->sdata->vif.bss_conf;
655 txrc.reported_rate.idx = -1;
656 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
657 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
658 txrc.max_rate_idx = -1;
660 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
662 if (tx->sdata->rc_has_mcs_mask[info->band])
663 txrc.rate_idx_mcs_mask =
664 tx->sdata->rc_rateidx_mcs_mask[info->band];
666 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
667 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
668 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
670 /* set up RTS protection if desired */
671 if (len > tx->local->hw.wiphy->rts_threshold) {
675 info->control.use_rts = txrc.rts;
676 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
679 * Use short preamble if the BSS can handle it, but not for
680 * management frames unless we know the receiver can handle
681 * that -- the management frame might be to a station that
682 * just wants a probe response.
684 if (tx->sdata->vif.bss_conf.use_short_preamble &&
685 (ieee80211_is_data(hdr->frame_control) ||
686 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
687 txrc.short_preamble = true;
689 info->control.short_preamble = txrc.short_preamble;
692 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
695 * Lets not bother rate control if we're associated and cannot
696 * talk to the sta. This should not happen.
698 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
699 !rate_usable_index_exists(sband, &tx->sta->sta),
700 "%s: Dropped data frame as no usable bitrate found while "
701 "scanning and associated. Target station: "
702 "%pM on %d GHz band\n",
703 tx->sdata->name, hdr->addr1,
708 * If we're associated with the sta at this point we know we can at
709 * least send the frame at the lowest bit rate.
711 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
713 if (tx->sta && !info->control.skip_table)
714 ratetbl = rcu_dereference(tx->sta->sta.rates);
716 if (unlikely(info->control.rates[0].idx < 0)) {
718 struct ieee80211_tx_rate rate = {
719 .idx = ratetbl->rate[0].idx,
720 .flags = ratetbl->rate[0].flags,
721 .count = ratetbl->rate[0].count
724 if (ratetbl->rate[0].idx < 0)
732 tx->rate = info->control.rates[0];
735 if (txrc.reported_rate.idx < 0) {
736 txrc.reported_rate = tx->rate;
737 if (tx->sta && ieee80211_is_data(hdr->frame_control))
738 tx->sta->last_tx_rate = txrc.reported_rate;
740 tx->sta->last_tx_rate = txrc.reported_rate;
745 if (unlikely(!info->control.rates[0].count))
746 info->control.rates[0].count = 1;
748 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
749 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
750 info->control.rates[0].count = 1;
755 static ieee80211_tx_result debug_noinline
756 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
758 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
759 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
765 * Packet injection may want to control the sequence
766 * number, if we have no matching interface then we
767 * neither assign one ourselves nor ask the driver to.
769 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
772 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
775 if (ieee80211_hdrlen(hdr->frame_control) < 24)
778 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
782 * Anything but QoS data that has a sequence number field
783 * (is long enough) gets a sequence number from the global
784 * counter. QoS data frames with a multicast destination
785 * also use the global counter (802.11-2012 9.3.2.10).
787 if (!ieee80211_is_data_qos(hdr->frame_control) ||
788 is_multicast_ether_addr(hdr->addr1)) {
789 /* driver should assign sequence number */
790 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
791 /* for pure STA mode without beacons, we can do it */
792 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
793 tx->sdata->sequence_number += 0x10;
798 * This should be true for injected/management frames only, for
799 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
800 * above since they are not QoS-data frames.
805 /* include per-STA, per-TID sequence counter */
807 qc = ieee80211_get_qos_ctl(hdr);
808 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
809 seq = &tx->sta->tid_seq[tid];
811 hdr->seq_ctrl = cpu_to_le16(*seq);
813 /* Increase the sequence number. */
814 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
819 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
820 struct sk_buff *skb, int hdrlen,
823 struct ieee80211_local *local = tx->local;
824 struct ieee80211_tx_info *info;
826 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
827 int pos = hdrlen + per_fragm;
828 int rem = skb->len - hdrlen - per_fragm;
830 if (WARN_ON(rem < 0))
833 /* first fragment was already added to queue by caller */
836 int fraglen = per_fragm;
841 tmp = dev_alloc_skb(local->tx_headroom +
843 IEEE80211_ENCRYPT_HEADROOM +
844 IEEE80211_ENCRYPT_TAILROOM);
848 __skb_queue_tail(&tx->skbs, tmp);
850 skb_reserve(tmp, local->tx_headroom +
851 IEEE80211_ENCRYPT_HEADROOM);
852 /* copy control information */
853 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
855 info = IEEE80211_SKB_CB(tmp);
856 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
857 IEEE80211_TX_CTL_FIRST_FRAGMENT);
860 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
862 skb_copy_queue_mapping(tmp, skb);
863 tmp->priority = skb->priority;
866 /* copy header and data */
867 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
868 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
873 /* adjust first fragment's length */
874 skb->len = hdrlen + per_fragm;
878 static ieee80211_tx_result debug_noinline
879 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
881 struct sk_buff *skb = tx->skb;
882 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
883 struct ieee80211_hdr *hdr = (void *)skb->data;
884 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
888 /* no matter what happens, tx->skb moves to tx->skbs */
889 __skb_queue_tail(&tx->skbs, skb);
892 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
895 if (tx->local->ops->set_frag_threshold)
899 * Warn when submitting a fragmented A-MPDU frame and drop it.
900 * This scenario is handled in ieee80211_tx_prepare but extra
901 * caution taken here as fragmented ampdu may cause Tx stop.
903 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
906 hdrlen = ieee80211_hdrlen(hdr->frame_control);
908 /* internal error, why isn't DONTFRAG set? */
909 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
913 * Now fragment the frame. This will allocate all the fragments and
914 * chain them (using skb as the first fragment) to skb->next.
915 * During transmission, we will remove the successfully transmitted
916 * fragments from this list. When the low-level driver rejects one
917 * of the fragments then we will simply pretend to accept the skb
918 * but store it away as pending.
920 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
923 /* update duration/seq/flags of fragments */
926 skb_queue_walk(&tx->skbs, skb) {
927 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
929 hdr = (void *)skb->data;
930 info = IEEE80211_SKB_CB(skb);
932 if (!skb_queue_is_last(&tx->skbs, skb)) {
933 hdr->frame_control |= morefrags;
935 * No multi-rate retries for fragmented frames, that
936 * would completely throw off the NAV at other STAs.
938 info->control.rates[1].idx = -1;
939 info->control.rates[2].idx = -1;
940 info->control.rates[3].idx = -1;
941 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
942 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
944 hdr->frame_control &= ~morefrags;
946 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
953 static ieee80211_tx_result debug_noinline
954 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
962 skb_queue_walk(&tx->skbs, skb) {
963 ac = skb_get_queue_mapping(skb);
964 tx->sta->tx_fragments++;
965 tx->sta->tx_bytes[ac] += skb->len;
968 tx->sta->tx_packets[ac]++;
973 static ieee80211_tx_result debug_noinline
974 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
979 switch (tx->key->conf.cipher) {
980 case WLAN_CIPHER_SUITE_WEP40:
981 case WLAN_CIPHER_SUITE_WEP104:
982 return ieee80211_crypto_wep_encrypt(tx);
983 case WLAN_CIPHER_SUITE_TKIP:
984 return ieee80211_crypto_tkip_encrypt(tx);
985 case WLAN_CIPHER_SUITE_CCMP:
986 return ieee80211_crypto_ccmp_encrypt(tx);
987 case WLAN_CIPHER_SUITE_AES_CMAC:
988 return ieee80211_crypto_aes_cmac_encrypt(tx);
990 return ieee80211_crypto_hw_encrypt(tx);
996 static ieee80211_tx_result debug_noinline
997 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1000 struct ieee80211_hdr *hdr;
1004 skb_queue_walk(&tx->skbs, skb) {
1005 hdr = (void *) skb->data;
1006 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1007 break; /* must not overwrite AID */
1008 if (!skb_queue_is_last(&tx->skbs, skb)) {
1009 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1010 next_len = next->len;
1013 group_addr = is_multicast_ether_addr(hdr->addr1);
1016 ieee80211_duration(tx, skb, group_addr, next_len);
1022 /* actual transmit path */
1024 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1025 struct sk_buff *skb,
1026 struct ieee80211_tx_info *info,
1027 struct tid_ampdu_tx *tid_tx,
1030 bool queued = false;
1031 bool reset_agg_timer = false;
1032 struct sk_buff *purge_skb = NULL;
1034 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1035 info->flags |= IEEE80211_TX_CTL_AMPDU;
1036 reset_agg_timer = true;
1037 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1039 * nothing -- this aggregation session is being started
1040 * but that might still fail with the driver
1043 spin_lock(&tx->sta->lock);
1045 * Need to re-check now, because we may get here
1047 * 1) in the window during which the setup is actually
1048 * already done, but not marked yet because not all
1049 * packets are spliced over to the driver pending
1050 * queue yet -- if this happened we acquire the lock
1051 * either before or after the splice happens, but
1052 * need to recheck which of these cases happened.
1054 * 2) during session teardown, if the OPERATIONAL bit
1055 * was cleared due to the teardown but the pointer
1056 * hasn't been assigned NULL yet (or we loaded it
1057 * before it was assigned) -- in this case it may
1058 * now be NULL which means we should just let the
1059 * packet pass through because splicing the frames
1060 * back is already done.
1062 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1065 /* do nothing, let packet pass through */
1066 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1067 info->flags |= IEEE80211_TX_CTL_AMPDU;
1068 reset_agg_timer = true;
1071 info->control.vif = &tx->sdata->vif;
1072 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1073 __skb_queue_tail(&tid_tx->pending, skb);
1074 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1075 purge_skb = __skb_dequeue(&tid_tx->pending);
1077 spin_unlock(&tx->sta->lock);
1080 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1083 /* reset session timer */
1084 if (reset_agg_timer && tid_tx->timeout)
1085 tid_tx->last_tx = jiffies;
1093 static ieee80211_tx_result
1094 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1095 struct ieee80211_tx_data *tx,
1096 struct sk_buff *skb)
1098 struct ieee80211_local *local = sdata->local;
1099 struct ieee80211_hdr *hdr;
1100 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1104 memset(tx, 0, sizeof(*tx));
1108 __skb_queue_head_init(&tx->skbs);
1111 * If this flag is set to true anywhere, and we get here,
1112 * we are doing the needed processing, so remove the flag
1115 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1117 hdr = (struct ieee80211_hdr *) skb->data;
1119 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1120 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1121 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1123 } else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
1124 IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
1125 tx->sdata->control_port_protocol == tx->skb->protocol) {
1126 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1129 tx->sta = sta_info_get(sdata, hdr->addr1);
1131 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1132 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1133 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1134 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1135 struct tid_ampdu_tx *tid_tx;
1137 qc = ieee80211_get_qos_ctl(hdr);
1138 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1140 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1144 queued = ieee80211_tx_prep_agg(tx, skb, info,
1147 if (unlikely(queued))
1152 if (is_multicast_ether_addr(hdr->addr1)) {
1153 tx->flags &= ~IEEE80211_TX_UNICAST;
1154 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1156 tx->flags |= IEEE80211_TX_UNICAST;
1158 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1159 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1160 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1161 info->flags & IEEE80211_TX_CTL_AMPDU)
1162 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1166 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1167 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1168 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1170 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1175 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1176 struct ieee80211_vif *vif,
1177 struct ieee80211_sta *sta,
1178 struct sk_buff_head *skbs,
1181 struct ieee80211_tx_control control;
1182 struct sk_buff *skb, *tmp;
1183 unsigned long flags;
1185 skb_queue_walk_safe(skbs, skb, tmp) {
1186 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1187 int q = info->hw_queue;
1189 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1190 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1191 __skb_unlink(skb, skbs);
1192 ieee80211_free_txskb(&local->hw, skb);
1197 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1198 if (local->queue_stop_reasons[q] ||
1199 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1200 if (unlikely(info->flags &
1201 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1202 if (local->queue_stop_reasons[q] &
1203 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1205 * Drop off-channel frames if queues
1206 * are stopped for any reason other
1207 * than off-channel operation. Never
1210 spin_unlock_irqrestore(
1211 &local->queue_stop_reason_lock,
1213 ieee80211_purge_tx_queue(&local->hw,
1220 * Since queue is stopped, queue up frames for
1221 * later transmission from the tx-pending
1222 * tasklet when the queue is woken again.
1225 skb_queue_splice_init(skbs,
1226 &local->pending[q]);
1228 skb_queue_splice_tail_init(skbs,
1229 &local->pending[q]);
1231 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1236 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1238 info->control.vif = vif;
1241 __skb_unlink(skb, skbs);
1242 drv_tx(local, &control, skb);
1249 * Returns false if the frame couldn't be transmitted but was queued instead.
1251 static bool __ieee80211_tx(struct ieee80211_local *local,
1252 struct sk_buff_head *skbs, int led_len,
1253 struct sta_info *sta, bool txpending)
1255 struct ieee80211_tx_info *info;
1256 struct ieee80211_sub_if_data *sdata;
1257 struct ieee80211_vif *vif;
1258 struct ieee80211_sta *pubsta;
1259 struct sk_buff *skb;
1263 if (WARN_ON(skb_queue_empty(skbs)))
1266 skb = skb_peek(skbs);
1267 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1268 info = IEEE80211_SKB_CB(skb);
1269 sdata = vif_to_sdata(info->control.vif);
1270 if (sta && !sta->uploaded)
1278 switch (sdata->vif.type) {
1279 case NL80211_IFTYPE_MONITOR:
1280 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1284 sdata = rcu_dereference(local->monitor_sdata);
1288 vif->hw_queue[skb_get_queue_mapping(skb)];
1289 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1295 case NL80211_IFTYPE_AP_VLAN:
1296 sdata = container_of(sdata->bss,
1297 struct ieee80211_sub_if_data, u.ap);
1304 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1307 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1309 WARN_ON_ONCE(!skb_queue_empty(skbs));
1315 * Invoke TX handlers, return 0 on success and non-zero if the
1316 * frame was dropped or queued.
1318 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1320 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1321 ieee80211_tx_result res = TX_DROP;
1323 #define CALL_TXH(txh) \
1326 if (res != TX_CONTINUE) \
1330 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1331 CALL_TXH(ieee80211_tx_h_check_assoc);
1332 CALL_TXH(ieee80211_tx_h_ps_buf);
1333 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1334 CALL_TXH(ieee80211_tx_h_select_key);
1335 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1336 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1338 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1339 __skb_queue_tail(&tx->skbs, tx->skb);
1344 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1345 CALL_TXH(ieee80211_tx_h_sequence);
1346 CALL_TXH(ieee80211_tx_h_fragment);
1347 /* handlers after fragment must be aware of tx info fragmentation! */
1348 CALL_TXH(ieee80211_tx_h_stats);
1349 CALL_TXH(ieee80211_tx_h_encrypt);
1350 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1351 CALL_TXH(ieee80211_tx_h_calculate_duration);
1355 if (unlikely(res == TX_DROP)) {
1356 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1358 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1360 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1362 } else if (unlikely(res == TX_QUEUED)) {
1363 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1371 * Returns false if the frame couldn't be transmitted but was queued instead.
1373 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1374 struct sk_buff *skb, bool txpending,
1375 enum ieee80211_band band)
1377 struct ieee80211_local *local = sdata->local;
1378 struct ieee80211_tx_data tx;
1379 ieee80211_tx_result res_prepare;
1380 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1384 if (unlikely(skb->len < 10)) {
1389 /* initialises tx */
1391 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1393 if (unlikely(res_prepare == TX_DROP)) {
1394 ieee80211_free_txskb(&local->hw, skb);
1396 } else if (unlikely(res_prepare == TX_QUEUED)) {
1402 /* set up hw_queue value early */
1403 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1404 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1406 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1408 if (!invoke_tx_handlers(&tx))
1409 result = __ieee80211_tx(local, &tx.skbs, led_len,
1415 /* device xmit handlers */
1417 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1418 struct sk_buff *skb,
1419 int head_need, bool may_encrypt)
1421 struct ieee80211_local *local = sdata->local;
1424 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1425 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1426 tail_need -= skb_tailroom(skb);
1427 tail_need = max_t(int, tail_need, 0);
1430 if (skb_cloned(skb))
1431 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1432 else if (head_need || tail_need)
1433 I802_DEBUG_INC(local->tx_expand_skb_head);
1437 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1438 wiphy_debug(local->hw.wiphy,
1439 "failed to reallocate TX buffer\n");
1446 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1447 enum ieee80211_band band)
1449 struct ieee80211_local *local = sdata->local;
1450 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1451 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1455 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1457 headroom = local->tx_headroom;
1459 headroom += IEEE80211_ENCRYPT_HEADROOM;
1460 headroom -= skb_headroom(skb);
1461 headroom = max_t(int, 0, headroom);
1463 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1464 ieee80211_free_txskb(&local->hw, skb);
1468 hdr = (struct ieee80211_hdr *) skb->data;
1469 info->control.vif = &sdata->vif;
1471 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1472 if (ieee80211_is_data(hdr->frame_control) &&
1473 is_unicast_ether_addr(hdr->addr1)) {
1474 if (mesh_nexthop_resolve(sdata, skb))
1475 return; /* skb queued: don't free */
1477 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1481 ieee80211_set_qos_hdr(sdata, skb);
1482 ieee80211_tx(sdata, skb, false, band);
1485 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1487 struct ieee80211_radiotap_iterator iterator;
1488 struct ieee80211_radiotap_header *rthdr =
1489 (struct ieee80211_radiotap_header *) skb->data;
1490 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1491 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1495 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1496 IEEE80211_TX_CTL_DONTFRAG;
1499 * for every radiotap entry that is present
1500 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1501 * entries present, or -EINVAL on error)
1505 ret = ieee80211_radiotap_iterator_next(&iterator);
1510 /* see if this argument is something we can use */
1511 switch (iterator.this_arg_index) {
1513 * You must take care when dereferencing iterator.this_arg
1514 * for multibyte types... the pointer is not aligned. Use
1515 * get_unaligned((type *)iterator.this_arg) to dereference
1516 * iterator.this_arg for type "type" safely on all arches.
1518 case IEEE80211_RADIOTAP_FLAGS:
1519 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1521 * this indicates that the skb we have been
1522 * handed has the 32-bit FCS CRC at the end...
1523 * we should react to that by snipping it off
1524 * because it will be recomputed and added
1527 if (skb->len < (iterator._max_length + FCS_LEN))
1530 skb_trim(skb, skb->len - FCS_LEN);
1532 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1533 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1534 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1535 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1538 case IEEE80211_RADIOTAP_TX_FLAGS:
1539 txflags = get_unaligned_le16(iterator.this_arg);
1540 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1541 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1545 * Please update the file
1546 * Documentation/networking/mac80211-injection.txt
1547 * when parsing new fields here.
1555 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1559 * remove the radiotap header
1560 * iterator->_max_length was sanity-checked against
1561 * skb->len by iterator init
1563 skb_pull(skb, iterator._max_length);
1568 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1569 struct net_device *dev)
1571 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1572 struct ieee80211_chanctx_conf *chanctx_conf;
1573 struct ieee80211_channel *chan;
1574 struct ieee80211_radiotap_header *prthdr =
1575 (struct ieee80211_radiotap_header *)skb->data;
1576 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1577 struct ieee80211_hdr *hdr;
1578 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1582 /* check for not even having the fixed radiotap header part */
1583 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1584 goto fail; /* too short to be possibly valid */
1586 /* is it a header version we can trust to find length from? */
1587 if (unlikely(prthdr->it_version))
1588 goto fail; /* only version 0 is supported */
1590 /* then there must be a radiotap header with a length we can use */
1591 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1593 /* does the skb contain enough to deliver on the alleged length? */
1594 if (unlikely(skb->len < len_rthdr))
1595 goto fail; /* skb too short for claimed rt header extent */
1598 * fix up the pointers accounting for the radiotap
1599 * header still being in there. We are being given
1600 * a precooked IEEE80211 header so no need for
1603 skb_set_mac_header(skb, len_rthdr);
1605 * these are just fixed to the end of the rt area since we
1606 * don't have any better information and at this point, nobody cares
1608 skb_set_network_header(skb, len_rthdr);
1609 skb_set_transport_header(skb, len_rthdr);
1611 if (skb->len < len_rthdr + 2)
1614 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1615 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1617 if (skb->len < len_rthdr + hdrlen)
1621 * Initialize skb->protocol if the injected frame is a data frame
1622 * carrying a rfc1042 header
1624 if (ieee80211_is_data(hdr->frame_control) &&
1625 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1626 u8 *payload = (u8 *)hdr + hdrlen;
1628 if (ether_addr_equal(payload, rfc1042_header))
1629 skb->protocol = cpu_to_be16((payload[6] << 8) |
1633 memset(info, 0, sizeof(*info));
1635 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1636 IEEE80211_TX_CTL_INJECTED;
1638 /* process and remove the injection radiotap header */
1639 if (!ieee80211_parse_tx_radiotap(skb))
1645 * We process outgoing injected frames that have a local address
1646 * we handle as though they are non-injected frames.
1647 * This code here isn't entirely correct, the local MAC address
1648 * isn't always enough to find the interface to use; for proper
1649 * VLAN/WDS support we will need a different mechanism (which
1650 * likely isn't going to be monitor interfaces).
1652 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1654 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1655 if (!ieee80211_sdata_running(tmp_sdata))
1657 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1658 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1659 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1661 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1667 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1668 if (!chanctx_conf) {
1669 tmp_sdata = rcu_dereference(local->monitor_sdata);
1672 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1676 chan = chanctx_conf->def.chan;
1677 else if (!local->use_chanctx)
1678 chan = local->_oper_chandef.chan;
1683 * Frame injection is not allowed if beaconing is not allowed
1684 * or if we need radar detection. Beaconing is usually not allowed when
1685 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1686 * Passive scan is also used in world regulatory domains where
1687 * your country is not known and as such it should be treated as
1688 * NO TX unless the channel is explicitly allowed in which case
1689 * your current regulatory domain would not have the passive scan
1692 * Since AP mode uses monitor interfaces to inject/TX management
1693 * frames we can make AP mode the exception to this rule once it
1694 * supports radar detection as its implementation can deal with
1695 * radar detection by itself. We can do that later by adding a
1696 * monitor flag interfaces used for AP support.
1698 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1699 IEEE80211_CHAN_PASSIVE_SCAN)))
1702 ieee80211_xmit(sdata, skb, chan->band);
1705 return NETDEV_TX_OK;
1711 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1715 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1716 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1717 * @skb: packet to be sent
1718 * @dev: incoming interface
1720 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1721 * not be freed, and caller is responsible for either retrying later or freeing
1724 * This function takes in an Ethernet header and encapsulates it with suitable
1725 * IEEE 802.11 header based on which interface the packet is coming in. The
1726 * encapsulated packet will then be passed to master interface, wlan#.11, for
1727 * transmission (through low-level driver).
1729 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1730 struct net_device *dev)
1732 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1733 struct ieee80211_local *local = sdata->local;
1734 struct ieee80211_tx_info *info;
1736 u16 ethertype, hdrlen, meshhdrlen = 0;
1738 struct ieee80211_hdr hdr;
1739 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1740 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1741 const u8 *encaps_data;
1742 int encaps_len, skip_header_bytes;
1744 struct sta_info *sta = NULL;
1745 bool wme_sta = false, authorized = false, tdls_auth = false;
1746 bool tdls_direct = false;
1750 struct ieee80211_chanctx_conf *chanctx_conf;
1751 struct ieee80211_sub_if_data *ap_sdata;
1752 enum ieee80211_band band;
1754 if (unlikely(skb->len < ETH_HLEN))
1757 /* convert Ethernet header to proper 802.11 header (based on
1758 * operation mode) */
1759 ethertype = (skb->data[12] << 8) | skb->data[13];
1760 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1764 switch (sdata->vif.type) {
1765 case NL80211_IFTYPE_AP_VLAN:
1766 sta = rcu_dereference(sdata->u.vlan.sta);
1768 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1770 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1771 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1772 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1773 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1775 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1776 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1778 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1780 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1783 band = chanctx_conf->def.chan->band;
1787 case NL80211_IFTYPE_AP:
1788 if (sdata->vif.type == NL80211_IFTYPE_AP)
1789 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1792 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1794 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1795 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1796 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1798 band = chanctx_conf->def.chan->band;
1800 case NL80211_IFTYPE_WDS:
1801 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1803 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1804 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1805 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1806 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1809 * This is the exception! WDS style interfaces are prohibited
1810 * when channel contexts are in used so this must be valid
1812 band = local->hw.conf.chandef.chan->band;
1814 #ifdef CONFIG_MAC80211_MESH
1815 case NL80211_IFTYPE_MESH_POINT:
1816 if (!is_multicast_ether_addr(skb->data)) {
1817 struct sta_info *next_hop;
1818 bool mpp_lookup = true;
1820 mpath = mesh_path_lookup(sdata, skb->data);
1823 next_hop = rcu_dereference(mpath->next_hop);
1825 !(mpath->flags & (MESH_PATH_ACTIVE |
1826 MESH_PATH_RESOLVING)))
1831 mppath = mpp_path_lookup(sdata, skb->data);
1833 if (mppath && mpath)
1834 mesh_path_del(mpath->sdata, mpath->dst);
1838 * Use address extension if it is a packet from
1839 * another interface or if we know the destination
1840 * is being proxied by a portal (i.e. portal address
1841 * differs from proxied address)
1843 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1844 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1845 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1846 skb->data, skb->data + ETH_ALEN);
1847 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1850 /* DS -> MBSS (802.11-2012 13.11.3.3).
1851 * For unicast with unknown forwarding information,
1852 * destination might be in the MBSS or if that fails
1853 * forwarded to another mesh gate. In either case
1854 * resolution will be handled in ieee80211_xmit(), so
1855 * leave the original DA. This also works for mcast */
1856 const u8 *mesh_da = skb->data;
1859 mesh_da = mppath->mpp;
1861 mesh_da = mpath->dst;
1863 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1864 mesh_da, sdata->vif.addr);
1865 if (is_multicast_ether_addr(mesh_da))
1866 /* DA TA mSA AE:SA */
1867 meshhdrlen = ieee80211_new_mesh_header(
1869 skb->data + ETH_ALEN, NULL);
1871 /* RA TA mDA mSA AE:DA SA */
1872 meshhdrlen = ieee80211_new_mesh_header(
1873 sdata, &mesh_hdr, skb->data,
1874 skb->data + ETH_ALEN);
1877 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1880 band = chanctx_conf->def.chan->band;
1883 case NL80211_IFTYPE_STATION:
1884 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1885 bool tdls_peer = false;
1887 sta = sta_info_get(sdata, skb->data);
1889 authorized = test_sta_flag(sta,
1890 WLAN_STA_AUTHORIZED);
1891 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1892 tdls_peer = test_sta_flag(sta,
1893 WLAN_STA_TDLS_PEER);
1894 tdls_auth = test_sta_flag(sta,
1895 WLAN_STA_TDLS_PEER_AUTH);
1899 * If the TDLS link is enabled, send everything
1900 * directly. Otherwise, allow TDLS setup frames
1901 * to be transmitted indirectly.
1903 tdls_direct = tdls_peer && (tdls_auth ||
1904 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1905 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1909 /* link during setup - throw out frames to peer */
1914 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1915 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1916 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1918 } else if (sdata->u.mgd.use_4addr &&
1919 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1920 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1921 IEEE80211_FCTL_TODS);
1923 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1924 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1925 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1926 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1929 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1931 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1932 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1933 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1936 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1939 band = chanctx_conf->def.chan->band;
1941 case NL80211_IFTYPE_ADHOC:
1943 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1944 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1945 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1947 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1950 band = chanctx_conf->def.chan->band;
1957 * There's no need to try to look up the destination
1958 * if it is a multicast address (which can only happen
1961 multicast = is_multicast_ether_addr(hdr.addr1);
1963 sta = sta_info_get(sdata, hdr.addr1);
1965 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1966 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1970 /* For mesh, the use of the QoS header is mandatory */
1971 if (ieee80211_vif_is_mesh(&sdata->vif))
1974 /* receiver and we are QoS enabled, use a QoS type frame */
1975 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1976 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1981 * Drop unicast frames to unauthorised stations unless they are
1982 * EAPOL frames from the local station.
1984 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1985 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1986 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1987 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1988 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1989 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1990 dev->name, hdr.addr1);
1993 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1998 if (unlikely(!multicast && skb->sk &&
1999 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2000 struct sk_buff *orig_skb = skb;
2002 skb = skb_clone(skb, GFP_ATOMIC);
2004 unsigned long flags;
2007 spin_lock_irqsave(&local->ack_status_lock, flags);
2008 id = idr_alloc(&local->ack_status_frames, orig_skb,
2009 1, 0x10000, GFP_ATOMIC);
2010 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2014 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2015 } else if (skb_shared(skb)) {
2016 kfree_skb(orig_skb);
2022 /* couldn't clone -- lose tx status ... */
2028 * If the skb is shared we need to obtain our own copy.
2030 if (skb_shared(skb)) {
2031 struct sk_buff *tmp_skb = skb;
2033 /* can't happen -- skb is a clone if info_id != 0 */
2036 skb = skb_clone(skb, GFP_ATOMIC);
2043 hdr.frame_control = fc;
2044 hdr.duration_id = 0;
2047 skip_header_bytes = ETH_HLEN;
2048 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2049 encaps_data = bridge_tunnel_header;
2050 encaps_len = sizeof(bridge_tunnel_header);
2051 skip_header_bytes -= 2;
2052 } else if (ethertype >= ETH_P_802_3_MIN) {
2053 encaps_data = rfc1042_header;
2054 encaps_len = sizeof(rfc1042_header);
2055 skip_header_bytes -= 2;
2061 nh_pos = skb_network_header(skb) - skb->data;
2062 h_pos = skb_transport_header(skb) - skb->data;
2064 skb_pull(skb, skip_header_bytes);
2065 nh_pos -= skip_header_bytes;
2066 h_pos -= skip_header_bytes;
2068 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2071 * So we need to modify the skb header and hence need a copy of
2072 * that. The head_need variable above doesn't, so far, include
2073 * the needed header space that we don't need right away. If we
2074 * can, then we don't reallocate right now but only after the
2075 * frame arrives at the master device (if it does...)
2077 * If we cannot, however, then we will reallocate to include all
2078 * the ever needed space. Also, if we need to reallocate it anyway,
2079 * make it big enough for everything we may ever need.
2082 if (head_need > 0 || skb_cloned(skb)) {
2083 head_need += IEEE80211_ENCRYPT_HEADROOM;
2084 head_need += local->tx_headroom;
2085 head_need = max_t(int, 0, head_need);
2086 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2087 ieee80211_free_txskb(&local->hw, skb);
2094 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2095 nh_pos += encaps_len;
2096 h_pos += encaps_len;
2099 #ifdef CONFIG_MAC80211_MESH
2100 if (meshhdrlen > 0) {
2101 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2102 nh_pos += meshhdrlen;
2103 h_pos += meshhdrlen;
2107 if (ieee80211_is_data_qos(fc)) {
2108 __le16 *qos_control;
2110 qos_control = (__le16*) skb_push(skb, 2);
2111 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2113 * Maybe we could actually set some fields here, for now just
2114 * initialise to zero to indicate no special operation.
2118 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2123 dev->stats.tx_packets++;
2124 dev->stats.tx_bytes += skb->len;
2126 /* Update skb pointers to various headers since this modified frame
2127 * is going to go through Linux networking code that may potentially
2128 * need things like pointer to IP header. */
2129 skb_set_mac_header(skb, 0);
2130 skb_set_network_header(skb, nh_pos);
2131 skb_set_transport_header(skb, h_pos);
2133 info = IEEE80211_SKB_CB(skb);
2134 memset(info, 0, sizeof(*info));
2136 dev->trans_start = jiffies;
2138 info->flags = info_flags;
2139 info->ack_frame_id = info_id;
2141 ieee80211_xmit(sdata, skb, band);
2144 return NETDEV_TX_OK;
2150 return NETDEV_TX_OK;
2155 * ieee80211_clear_tx_pending may not be called in a context where
2156 * it is possible that it packets could come in again.
2158 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2160 struct sk_buff *skb;
2163 for (i = 0; i < local->hw.queues; i++) {
2164 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2165 ieee80211_free_txskb(&local->hw, skb);
2170 * Returns false if the frame couldn't be transmitted but was queued instead,
2171 * which in this case means re-queued -- take as an indication to stop sending
2172 * more pending frames.
2174 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2175 struct sk_buff *skb)
2177 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2178 struct ieee80211_sub_if_data *sdata;
2179 struct sta_info *sta;
2180 struct ieee80211_hdr *hdr;
2182 struct ieee80211_chanctx_conf *chanctx_conf;
2184 sdata = vif_to_sdata(info->control.vif);
2186 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2187 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2188 if (unlikely(!chanctx_conf)) {
2192 result = ieee80211_tx(sdata, skb, true,
2193 chanctx_conf->def.chan->band);
2195 struct sk_buff_head skbs;
2197 __skb_queue_head_init(&skbs);
2198 __skb_queue_tail(&skbs, skb);
2200 hdr = (struct ieee80211_hdr *)skb->data;
2201 sta = sta_info_get(sdata, hdr->addr1);
2203 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2210 * Transmit all pending packets. Called from tasklet.
2212 void ieee80211_tx_pending(unsigned long data)
2214 struct ieee80211_local *local = (struct ieee80211_local *)data;
2215 unsigned long flags;
2221 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2222 for (i = 0; i < local->hw.queues; i++) {
2224 * If queue is stopped by something other than due to pending
2225 * frames, or we have no pending frames, proceed to next queue.
2227 if (local->queue_stop_reasons[i] ||
2228 skb_queue_empty(&local->pending[i]))
2231 while (!skb_queue_empty(&local->pending[i])) {
2232 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2233 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2235 if (WARN_ON(!info->control.vif)) {
2236 ieee80211_free_txskb(&local->hw, skb);
2240 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2243 txok = ieee80211_tx_pending_skb(local, skb);
2244 spin_lock_irqsave(&local->queue_stop_reason_lock,
2250 if (skb_queue_empty(&local->pending[i]))
2251 ieee80211_propagate_queue_wake(local, i);
2253 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2258 /* functions for drivers to get certain frames */
2260 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2261 struct ps_data *ps, struct sk_buff *skb)
2265 int i, have_bits = 0, n1, n2;
2267 /* Generate bitmap for TIM only if there are any STAs in power save
2269 if (atomic_read(&ps->num_sta_ps) > 0)
2270 /* in the hope that this is faster than
2271 * checking byte-for-byte */
2272 have_bits = !bitmap_empty((unsigned long*)ps->tim,
2273 IEEE80211_MAX_AID+1);
2275 if (ps->dtim_count == 0)
2276 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2280 tim = pos = (u8 *) skb_put(skb, 6);
2281 *pos++ = WLAN_EID_TIM;
2283 *pos++ = ps->dtim_count;
2284 *pos++ = sdata->vif.bss_conf.dtim_period;
2286 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2289 ps->dtim_bc_mc = aid0 == 1;
2292 /* Find largest even number N1 so that bits numbered 1 through
2293 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2294 * (N2 + 1) x 8 through 2007 are 0. */
2296 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2303 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2310 /* Bitmap control */
2312 /* Part Virt Bitmap */
2313 skb_put(skb, n2 - n1);
2314 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2316 tim[1] = n2 - n1 + 4;
2318 *pos++ = aid0; /* Bitmap control */
2319 *pos++ = 0; /* Part Virt Bitmap */
2323 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2324 struct ps_data *ps, struct sk_buff *skb)
2326 struct ieee80211_local *local = sdata->local;
2329 * Not very nice, but we want to allow the driver to call
2330 * ieee80211_beacon_get() as a response to the set_tim()
2331 * callback. That, however, is already invoked under the
2332 * sta_lock to guarantee consistent and race-free update
2333 * of the tim bitmap in mac80211 and the driver.
2335 if (local->tim_in_locked_section) {
2336 __ieee80211_beacon_add_tim(sdata, ps, skb);
2338 spin_lock_bh(&local->tim_lock);
2339 __ieee80211_beacon_add_tim(sdata, ps, skb);
2340 spin_unlock_bh(&local->tim_lock);
2346 void ieee80211_csa_finish(struct ieee80211_vif *vif)
2348 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2350 ieee80211_queue_work(&sdata->local->hw,
2351 &sdata->csa_finalize_work);
2353 EXPORT_SYMBOL(ieee80211_csa_finish);
2355 static void ieee80211_update_csa(struct ieee80211_sub_if_data *sdata,
2356 struct beacon_data *beacon)
2358 struct probe_resp *resp;
2359 int counter_offset_beacon = sdata->csa_counter_offset_beacon;
2360 int counter_offset_presp = sdata->csa_counter_offset_presp;
2362 /* warn if the driver did not check for/react to csa completeness */
2363 if (WARN_ON(((u8 *)beacon->tail)[counter_offset_beacon] == 0))
2366 ((u8 *)beacon->tail)[counter_offset_beacon]--;
2368 if (sdata->vif.type == NL80211_IFTYPE_AP &&
2369 counter_offset_presp) {
2371 resp = rcu_dereference(sdata->u.ap.probe_resp);
2373 /* if nl80211 accepted the offset, this should not happen. */
2374 if (WARN_ON(!resp)) {
2378 resp->data[counter_offset_presp]--;
2383 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
2385 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2386 struct beacon_data *beacon = NULL;
2388 size_t beacon_data_len;
2389 int counter_beacon = sdata->csa_counter_offset_beacon;
2392 if (!ieee80211_sdata_running(sdata))
2396 if (vif->type == NL80211_IFTYPE_AP) {
2397 struct ieee80211_if_ap *ap = &sdata->u.ap;
2399 beacon = rcu_dereference(ap->beacon);
2400 if (WARN_ON(!beacon || !beacon->tail))
2402 beacon_data = beacon->tail;
2403 beacon_data_len = beacon->tail_len;
2409 if (WARN_ON(counter_beacon > beacon_data_len))
2412 if (beacon_data[counter_beacon] == 0)
2419 EXPORT_SYMBOL(ieee80211_csa_is_complete);
2421 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2422 struct ieee80211_vif *vif,
2423 u16 *tim_offset, u16 *tim_length)
2425 struct ieee80211_local *local = hw_to_local(hw);
2426 struct sk_buff *skb = NULL;
2427 struct ieee80211_tx_info *info;
2428 struct ieee80211_sub_if_data *sdata = NULL;
2429 enum ieee80211_band band;
2430 struct ieee80211_tx_rate_control txrc;
2431 struct ieee80211_chanctx_conf *chanctx_conf;
2435 sdata = vif_to_sdata(vif);
2436 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2438 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2446 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2447 struct ieee80211_if_ap *ap = &sdata->u.ap;
2448 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2451 if (sdata->vif.csa_active)
2452 ieee80211_update_csa(sdata, beacon);
2455 * headroom, head length,
2456 * tail length and maximum TIM length
2458 skb = dev_alloc_skb(local->tx_headroom +
2460 beacon->tail_len + 256);
2464 skb_reserve(skb, local->tx_headroom);
2465 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2468 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2471 *tim_offset = beacon->head_len;
2473 *tim_length = skb->len - beacon->head_len;
2476 memcpy(skb_put(skb, beacon->tail_len),
2477 beacon->tail, beacon->tail_len);
2480 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2481 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2482 struct ieee80211_hdr *hdr;
2483 struct beacon_data *presp = rcu_dereference(ifibss->presp);
2488 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
2491 skb_reserve(skb, local->tx_headroom);
2492 memcpy(skb_put(skb, presp->head_len), presp->head,
2495 hdr = (struct ieee80211_hdr *) skb->data;
2496 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2497 IEEE80211_STYPE_BEACON);
2498 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2499 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2500 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
2505 if (ifmsh->sync_ops)
2506 ifmsh->sync_ops->adjust_tbtt(
2509 skb = dev_alloc_skb(local->tx_headroom +
2515 skb_reserve(skb, local->tx_headroom);
2516 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2517 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2518 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
2524 band = chanctx_conf->def.chan->band;
2526 info = IEEE80211_SKB_CB(skb);
2528 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2529 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2532 memset(&txrc, 0, sizeof(txrc));
2534 txrc.sband = local->hw.wiphy->bands[band];
2535 txrc.bss_conf = &sdata->vif.bss_conf;
2537 txrc.reported_rate.idx = -1;
2538 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2539 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2540 txrc.max_rate_idx = -1;
2542 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2544 rate_control_get_rate(sdata, NULL, &txrc);
2546 info->control.vif = vif;
2548 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2549 IEEE80211_TX_CTL_ASSIGN_SEQ |
2550 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2555 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2557 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2558 struct ieee80211_vif *vif)
2560 struct ieee80211_if_ap *ap = NULL;
2561 struct sk_buff *skb = NULL;
2562 struct probe_resp *presp = NULL;
2563 struct ieee80211_hdr *hdr;
2564 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2566 if (sdata->vif.type != NL80211_IFTYPE_AP)
2572 presp = rcu_dereference(ap->probe_resp);
2576 skb = dev_alloc_skb(presp->len);
2580 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2582 hdr = (struct ieee80211_hdr *) skb->data;
2583 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2589 EXPORT_SYMBOL(ieee80211_proberesp_get);
2591 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2592 struct ieee80211_vif *vif)
2594 struct ieee80211_sub_if_data *sdata;
2595 struct ieee80211_if_managed *ifmgd;
2596 struct ieee80211_pspoll *pspoll;
2597 struct ieee80211_local *local;
2598 struct sk_buff *skb;
2600 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2603 sdata = vif_to_sdata(vif);
2604 ifmgd = &sdata->u.mgd;
2605 local = sdata->local;
2607 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2611 skb_reserve(skb, local->hw.extra_tx_headroom);
2613 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2614 memset(pspoll, 0, sizeof(*pspoll));
2615 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2616 IEEE80211_STYPE_PSPOLL);
2617 pspoll->aid = cpu_to_le16(ifmgd->aid);
2619 /* aid in PS-Poll has its two MSBs each set to 1 */
2620 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2622 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2623 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2627 EXPORT_SYMBOL(ieee80211_pspoll_get);
2629 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2630 struct ieee80211_vif *vif)
2632 struct ieee80211_hdr_3addr *nullfunc;
2633 struct ieee80211_sub_if_data *sdata;
2634 struct ieee80211_if_managed *ifmgd;
2635 struct ieee80211_local *local;
2636 struct sk_buff *skb;
2638 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2641 sdata = vif_to_sdata(vif);
2642 ifmgd = &sdata->u.mgd;
2643 local = sdata->local;
2645 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2649 skb_reserve(skb, local->hw.extra_tx_headroom);
2651 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2653 memset(nullfunc, 0, sizeof(*nullfunc));
2654 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2655 IEEE80211_STYPE_NULLFUNC |
2656 IEEE80211_FCTL_TODS);
2657 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2658 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2659 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2663 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2665 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2666 struct ieee80211_vif *vif,
2667 const u8 *ssid, size_t ssid_len,
2670 struct ieee80211_sub_if_data *sdata;
2671 struct ieee80211_local *local;
2672 struct ieee80211_hdr_3addr *hdr;
2673 struct sk_buff *skb;
2677 sdata = vif_to_sdata(vif);
2678 local = sdata->local;
2679 ie_ssid_len = 2 + ssid_len;
2681 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2682 ie_ssid_len + tailroom);
2686 skb_reserve(skb, local->hw.extra_tx_headroom);
2688 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2689 memset(hdr, 0, sizeof(*hdr));
2690 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2691 IEEE80211_STYPE_PROBE_REQ);
2692 eth_broadcast_addr(hdr->addr1);
2693 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2694 eth_broadcast_addr(hdr->addr3);
2696 pos = skb_put(skb, ie_ssid_len);
2697 *pos++ = WLAN_EID_SSID;
2700 memcpy(pos, ssid, ssid_len);
2705 EXPORT_SYMBOL(ieee80211_probereq_get);
2707 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2708 const void *frame, size_t frame_len,
2709 const struct ieee80211_tx_info *frame_txctl,
2710 struct ieee80211_rts *rts)
2712 const struct ieee80211_hdr *hdr = frame;
2714 rts->frame_control =
2715 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2716 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2718 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2719 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2721 EXPORT_SYMBOL(ieee80211_rts_get);
2723 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2724 const void *frame, size_t frame_len,
2725 const struct ieee80211_tx_info *frame_txctl,
2726 struct ieee80211_cts *cts)
2728 const struct ieee80211_hdr *hdr = frame;
2730 cts->frame_control =
2731 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2732 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2733 frame_len, frame_txctl);
2734 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2736 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2739 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2740 struct ieee80211_vif *vif)
2742 struct ieee80211_local *local = hw_to_local(hw);
2743 struct sk_buff *skb = NULL;
2744 struct ieee80211_tx_data tx;
2745 struct ieee80211_sub_if_data *sdata;
2747 struct ieee80211_tx_info *info;
2748 struct ieee80211_chanctx_conf *chanctx_conf;
2750 sdata = vif_to_sdata(vif);
2753 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2758 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2759 struct beacon_data *beacon =
2760 rcu_dereference(sdata->u.ap.beacon);
2762 if (!beacon || !beacon->head)
2765 ps = &sdata->u.ap.ps;
2766 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2767 ps = &sdata->u.mesh.ps;
2772 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2773 goto out; /* send buffered bc/mc only after DTIM beacon */
2776 skb = skb_dequeue(&ps->bc_buf);
2779 local->total_ps_buffered--;
2781 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2782 struct ieee80211_hdr *hdr =
2783 (struct ieee80211_hdr *) skb->data;
2784 /* more buffered multicast/broadcast frames ==> set
2785 * MoreData flag in IEEE 802.11 header to inform PS
2787 hdr->frame_control |=
2788 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2791 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2792 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
2793 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2795 dev_kfree_skb_any(skb);
2798 info = IEEE80211_SKB_CB(skb);
2800 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2801 info->band = chanctx_conf->def.chan->band;
2803 if (invoke_tx_handlers(&tx))
2810 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2812 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2813 struct sk_buff *skb, int tid,
2814 enum ieee80211_band band)
2816 int ac = ieee802_1d_to_ac[tid & 7];
2818 skb_set_mac_header(skb, 0);
2819 skb_set_network_header(skb, 0);
2820 skb_set_transport_header(skb, 0);
2822 skb_set_queue_mapping(skb, ac);
2823 skb->priority = tid;
2825 skb->dev = sdata->dev;
2828 * The other path calling ieee80211_xmit is from the tasklet,
2829 * and while we can handle concurrent transmissions locking
2830 * requirements are that we do not come into tx with bhs on.
2833 ieee80211_xmit(sdata, skb, band);