2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
40 struct sk_buff *skb, int group_addr,
43 int rate, mrate, erp, dur, i;
44 struct ieee80211_rate *txrate;
45 struct ieee80211_local *local = tx->local;
46 struct ieee80211_supported_band *sband;
47 struct ieee80211_hdr *hdr;
48 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
50 /* assume HW handles this */
51 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
55 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
58 sband = local->hw.wiphy->bands[tx->channel->band];
59 txrate = &sband->bitrates[info->control.rates[0].idx];
61 erp = txrate->flags & IEEE80211_RATE_ERP_G;
64 * data and mgmt (except PS Poll):
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
80 hdr = (struct ieee80211_hdr *)skb->data;
81 if (ieee80211_is_ctl(hdr->frame_control)) {
82 /* TODO: These control frames are not currently sent by
83 * mac80211, but should they be implemented, this function
84 * needs to be updated to support duration field calculation.
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
94 * PS Poll: BIT(15) | BIT(14) | aid
100 if (0 /* FIX: data/mgmt during CFP */)
101 return cpu_to_le16(32768);
103 if (group_addr) /* Group address as the destination - no ACK */
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 /* use lowest available if everything fails */
118 mrate = sband->bitrates[0].bitrate;
119 for (i = 0; i < sband->n_bitrates; i++) {
120 struct ieee80211_rate *r = &sband->bitrates[i];
122 if (r->bitrate > txrate->bitrate)
125 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
128 switch (sband->band) {
129 case IEEE80211_BAND_2GHZ: {
131 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
132 flag = IEEE80211_RATE_MANDATORY_G;
134 flag = IEEE80211_RATE_MANDATORY_B;
139 case IEEE80211_BAND_5GHZ:
140 if (r->flags & IEEE80211_RATE_MANDATORY_A)
143 case IEEE80211_NUM_BANDS:
149 /* No matching basic rate found; use highest suitable mandatory
154 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
155 if (ieee80211_is_data_qos(hdr->frame_control) &&
156 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
159 /* Time needed to transmit ACK
160 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
161 * to closest integer */
162 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
163 tx->sdata->vif.bss_conf.use_short_preamble);
166 /* Frame is fragmented: duration increases with time needed to
167 * transmit next fragment plus ACK and 2 x SIFS. */
168 dur *= 2; /* ACK + SIFS */
170 dur += ieee80211_frame_duration(sband->band, next_frag_len,
171 txrate->bitrate, erp,
172 tx->sdata->vif.bss_conf.use_short_preamble);
175 return cpu_to_le16(dur);
179 static ieee80211_tx_result debug_noinline
180 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
182 struct ieee80211_local *local = tx->local;
183 struct ieee80211_if_managed *ifmgd;
185 /* driver doesn't support power save */
186 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
189 /* hardware does dynamic power save */
190 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
193 /* dynamic power save disabled */
194 if (local->hw.conf.dynamic_ps_timeout <= 0)
197 /* we are scanning, don't enable power save */
201 if (!local->ps_sdata)
204 /* No point if we're going to suspend */
205 if (local->quiescing)
208 /* dynamic ps is supported only in managed mode */
209 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
212 ifmgd = &tx->sdata->u.mgd;
215 * Don't wakeup from power save if u-apsd is enabled, voip ac has
216 * u-apsd enabled and the frame is in voip class. This effectively
217 * means that even if all access categories have u-apsd enabled, in
218 * practise u-apsd is only used with the voip ac. This is a
219 * workaround for the case when received voip class packets do not
220 * have correct qos tag for some reason, due the network or the
223 * Note: ifmgd->uapsd_queues access is racy here. If the value is
224 * changed via debugfs, user needs to reassociate manually to have
225 * everything in sync.
227 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
228 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
229 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
232 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
233 ieee80211_stop_queues_by_reason(&local->hw,
234 IEEE80211_QUEUE_STOP_REASON_PS);
235 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
236 ieee80211_queue_work(&local->hw,
237 &local->dynamic_ps_disable_work);
240 /* Don't restart the timer if we're not disassociated */
241 if (!ifmgd->associated)
244 mod_timer(&local->dynamic_ps_timer, jiffies +
245 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
250 static ieee80211_tx_result debug_noinline
251 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
254 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
255 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
258 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
261 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
262 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
263 !ieee80211_is_probe_req(hdr->frame_control) &&
264 !ieee80211_is_nullfunc(hdr->frame_control))
266 * When software scanning only nullfunc frames (to notify
267 * the sleep state to the AP) and probe requests (for the
268 * active scan) are allowed, all other frames should not be
269 * sent and we should not get here, but if we do
270 * nonetheless, drop them to avoid sending them
271 * off-channel. See the link below and
272 * ieee80211_start_scan() for more.
274 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
278 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
281 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
284 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
288 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
290 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
291 if (unlikely(!assoc &&
292 ieee80211_is_data(hdr->frame_control))) {
293 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
294 sdata_info(tx->sdata,
295 "dropped data frame to not associated station %pM\n",
298 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
301 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
302 ieee80211_is_data(hdr->frame_control) &&
303 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
305 * No associated STAs - no need to send multicast
314 /* This function is called whenever the AP is about to exceed the maximum limit
315 * of buffered frames for power saving STAs. This situation should not really
316 * happen often during normal operation, so dropping the oldest buffered packet
317 * from each queue should be OK to make some room for new frames. */
318 static void purge_old_ps_buffers(struct ieee80211_local *local)
320 int total = 0, purged = 0;
322 struct ieee80211_sub_if_data *sdata;
323 struct sta_info *sta;
326 * virtual interfaces are protected by RCU
330 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
331 struct ieee80211_if_ap *ap;
332 if (sdata->vif.type != NL80211_IFTYPE_AP)
335 skb = skb_dequeue(&ap->ps_bc_buf);
340 total += skb_queue_len(&ap->ps_bc_buf);
344 * Drop one frame from each station from the lowest-priority
345 * AC that has frames at all.
347 list_for_each_entry_rcu(sta, &local->sta_list, list) {
350 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
351 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
352 total += skb_queue_len(&sta->ps_tx_buf[ac]);
363 local->total_ps_buffered = total;
364 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
367 static ieee80211_tx_result
368 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
370 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
371 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
374 * broadcast/multicast frame
376 * If any of the associated stations is in power save mode,
377 * the frame is buffered to be sent after DTIM beacon frame.
378 * This is done either by the hardware or us.
381 /* powersaving STAs only in AP/VLAN mode */
385 /* no buffering for ordered frames */
386 if (ieee80211_has_order(hdr->frame_control))
389 /* no stations in PS mode */
390 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
393 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
394 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
395 info->hw_queue = tx->sdata->vif.cab_queue;
397 /* device releases frame after DTIM beacon */
398 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
401 /* buffered in mac80211 */
402 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
403 purge_old_ps_buffers(tx->local);
405 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
407 "BC TX buffer full - dropping the oldest frame\n");
408 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
410 tx->local->total_ps_buffered++;
412 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
417 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
420 if (!ieee80211_is_mgmt(fc))
423 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
426 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
433 static ieee80211_tx_result
434 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
436 struct sta_info *sta = tx->sta;
437 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
438 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
439 struct ieee80211_local *local = tx->local;
444 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
445 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
446 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
447 int ac = skb_get_queue_mapping(tx->skb);
449 /* only deauth, disassoc and action are bufferable MMPDUs */
450 if (ieee80211_is_mgmt(hdr->frame_control) &&
451 !ieee80211_is_deauth(hdr->frame_control) &&
452 !ieee80211_is_disassoc(hdr->frame_control) &&
453 !ieee80211_is_action(hdr->frame_control)) {
454 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
458 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
459 sta->sta.addr, sta->sta.aid, ac);
460 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
461 purge_old_ps_buffers(tx->local);
462 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
463 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
465 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
469 tx->local->total_ps_buffered++;
471 info->control.jiffies = jiffies;
472 info->control.vif = &tx->sdata->vif;
473 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
474 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
476 if (!timer_pending(&local->sta_cleanup))
477 mod_timer(&local->sta_cleanup,
478 round_jiffies(jiffies +
479 STA_INFO_CLEANUP_INTERVAL));
482 * We queued up some frames, so the TIM bit might
483 * need to be set, recalculate it.
485 sta_info_recalc_tim(sta);
488 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
490 "STA %pM in PS mode, but polling/in SP -> send frame\n",
497 static ieee80211_tx_result debug_noinline
498 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
500 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
503 if (tx->flags & IEEE80211_TX_UNICAST)
504 return ieee80211_tx_h_unicast_ps_buf(tx);
506 return ieee80211_tx_h_multicast_ps_buf(tx);
509 static ieee80211_tx_result debug_noinline
510 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
512 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
514 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
515 tx->sdata->control_port_no_encrypt))
516 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
521 static ieee80211_tx_result debug_noinline
522 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
524 struct ieee80211_key *key = NULL;
525 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
526 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
528 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
530 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
532 else if (ieee80211_is_mgmt(hdr->frame_control) &&
533 is_multicast_ether_addr(hdr->addr1) &&
534 ieee80211_is_robust_mgmt_frame(hdr) &&
535 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
537 else if (is_multicast_ether_addr(hdr->addr1) &&
538 (key = rcu_dereference(tx->sdata->default_multicast_key)))
540 else if (!is_multicast_ether_addr(hdr->addr1) &&
541 (key = rcu_dereference(tx->sdata->default_unicast_key)))
543 else if (tx->sdata->drop_unencrypted &&
544 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
545 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
546 (!ieee80211_is_robust_mgmt_frame(hdr) ||
547 (ieee80211_is_action(hdr->frame_control) &&
548 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) {
549 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
555 bool skip_hw = false;
557 tx->key->tx_rx_count++;
558 /* TODO: add threshold stuff again */
560 switch (tx->key->conf.cipher) {
561 case WLAN_CIPHER_SUITE_WEP40:
562 case WLAN_CIPHER_SUITE_WEP104:
563 case WLAN_CIPHER_SUITE_TKIP:
564 if (!ieee80211_is_data_present(hdr->frame_control))
567 case WLAN_CIPHER_SUITE_CCMP:
568 if (!ieee80211_is_data_present(hdr->frame_control) &&
569 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
573 skip_hw = (tx->key->conf.flags &
574 IEEE80211_KEY_FLAG_SW_MGMT) &&
575 ieee80211_is_mgmt(hdr->frame_control);
577 case WLAN_CIPHER_SUITE_AES_CMAC:
578 if (!ieee80211_is_mgmt(hdr->frame_control))
583 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
586 if (!skip_hw && tx->key &&
587 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
588 info->control.hw_key = &tx->key->conf;
594 static ieee80211_tx_result debug_noinline
595 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
597 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
598 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
599 struct ieee80211_supported_band *sband;
600 struct ieee80211_rate *rate;
603 bool inval = false, rts = false, short_preamble = false;
604 struct ieee80211_tx_rate_control txrc;
607 memset(&txrc, 0, sizeof(txrc));
609 sband = tx->local->hw.wiphy->bands[tx->channel->band];
611 len = min_t(u32, tx->skb->len + FCS_LEN,
612 tx->local->hw.wiphy->frag_threshold);
614 /* set up the tx rate control struct we give the RC algo */
615 txrc.hw = &tx->local->hw;
617 txrc.bss_conf = &tx->sdata->vif.bss_conf;
619 txrc.reported_rate.idx = -1;
620 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
621 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
622 txrc.max_rate_idx = -1;
624 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
625 memcpy(txrc.rate_idx_mcs_mask,
626 tx->sdata->rc_rateidx_mcs_mask[tx->channel->band],
627 sizeof(txrc.rate_idx_mcs_mask));
628 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
629 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
630 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
632 /* set up RTS protection if desired */
633 if (len > tx->local->hw.wiphy->rts_threshold) {
634 txrc.rts = rts = true;
638 * Use short preamble if the BSS can handle it, but not for
639 * management frames unless we know the receiver can handle
640 * that -- the management frame might be to a station that
641 * just wants a probe response.
643 if (tx->sdata->vif.bss_conf.use_short_preamble &&
644 (ieee80211_is_data(hdr->frame_control) ||
645 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
646 txrc.short_preamble = short_preamble = true;
649 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
652 * Lets not bother rate control if we're associated and cannot
653 * talk to the sta. This should not happen.
655 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
656 !rate_usable_index_exists(sband, &tx->sta->sta),
657 "%s: Dropped data frame as no usable bitrate found while "
658 "scanning and associated. Target station: "
659 "%pM on %d GHz band\n",
660 tx->sdata->name, hdr->addr1,
661 tx->channel->band ? 5 : 2))
665 * If we're associated with the sta at this point we know we can at
666 * least send the frame at the lowest bit rate.
668 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
670 if (unlikely(info->control.rates[0].idx < 0))
673 if (txrc.reported_rate.idx < 0) {
674 txrc.reported_rate = info->control.rates[0];
675 if (tx->sta && ieee80211_is_data(hdr->frame_control))
676 tx->sta->last_tx_rate = txrc.reported_rate;
678 tx->sta->last_tx_rate = txrc.reported_rate;
680 if (unlikely(!info->control.rates[0].count))
681 info->control.rates[0].count = 1;
683 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
684 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
685 info->control.rates[0].count = 1;
687 if (is_multicast_ether_addr(hdr->addr1)) {
689 * XXX: verify the rate is in the basic rateset
695 * set up the RTS/CTS rate as the fastest basic rate
696 * that is not faster than the data rate
698 * XXX: Should this check all retry rates?
700 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
703 rate = &sband->bitrates[info->control.rates[0].idx];
705 for (i = 0; i < sband->n_bitrates; i++) {
706 /* must be a basic rate */
707 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
709 /* must not be faster than the data rate */
710 if (sband->bitrates[i].bitrate > rate->bitrate)
713 if (sband->bitrates[baserate].bitrate <
714 sband->bitrates[i].bitrate)
718 info->control.rts_cts_rate_idx = baserate;
721 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
723 * make sure there's no valid rate following
724 * an invalid one, just in case drivers don't
725 * take the API seriously to stop at -1.
728 info->control.rates[i].idx = -1;
731 if (info->control.rates[i].idx < 0) {
737 * For now assume MCS is already set up correctly, this
740 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
741 WARN_ON(info->control.rates[i].idx > 76);
745 /* set up RTS protection if desired */
747 info->control.rates[i].flags |=
748 IEEE80211_TX_RC_USE_RTS_CTS;
751 if (WARN_ON_ONCE(info->control.rates[i].idx >=
752 sband->n_bitrates)) {
753 info->control.rates[i].idx = -1;
757 rate = &sband->bitrates[info->control.rates[i].idx];
759 /* set up short preamble */
760 if (short_preamble &&
761 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
762 info->control.rates[i].flags |=
763 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
765 /* set up G protection */
766 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
767 rate->flags & IEEE80211_RATE_ERP_G)
768 info->control.rates[i].flags |=
769 IEEE80211_TX_RC_USE_CTS_PROTECT;
775 static ieee80211_tx_result debug_noinline
776 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
778 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
779 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
785 * Packet injection may want to control the sequence
786 * number, if we have no matching interface then we
787 * neither assign one ourselves nor ask the driver to.
789 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
792 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
795 if (ieee80211_hdrlen(hdr->frame_control) < 24)
798 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
802 * Anything but QoS data that has a sequence number field
803 * (is long enough) gets a sequence number from the global
806 if (!ieee80211_is_data_qos(hdr->frame_control)) {
807 /* driver should assign sequence number */
808 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
809 /* for pure STA mode without beacons, we can do it */
810 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
811 tx->sdata->sequence_number += 0x10;
816 * This should be true for injected/management frames only, for
817 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
818 * above since they are not QoS-data frames.
823 /* include per-STA, per-TID sequence counter */
825 qc = ieee80211_get_qos_ctl(hdr);
826 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
827 seq = &tx->sta->tid_seq[tid];
829 hdr->seq_ctrl = cpu_to_le16(*seq);
831 /* Increase the sequence number. */
832 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
837 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
838 struct sk_buff *skb, int hdrlen,
841 struct ieee80211_local *local = tx->local;
842 struct ieee80211_tx_info *info;
844 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
845 int pos = hdrlen + per_fragm;
846 int rem = skb->len - hdrlen - per_fragm;
848 if (WARN_ON(rem < 0))
851 /* first fragment was already added to queue by caller */
854 int fraglen = per_fragm;
859 tmp = dev_alloc_skb(local->tx_headroom +
861 IEEE80211_ENCRYPT_HEADROOM +
862 IEEE80211_ENCRYPT_TAILROOM);
866 __skb_queue_tail(&tx->skbs, tmp);
868 skb_reserve(tmp, local->tx_headroom +
869 IEEE80211_ENCRYPT_HEADROOM);
870 /* copy control information */
871 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
873 info = IEEE80211_SKB_CB(tmp);
874 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
875 IEEE80211_TX_CTL_FIRST_FRAGMENT);
878 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
880 skb_copy_queue_mapping(tmp, skb);
881 tmp->priority = skb->priority;
884 /* copy header and data */
885 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
886 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
891 /* adjust first fragment's length */
892 skb->len = hdrlen + per_fragm;
896 static ieee80211_tx_result debug_noinline
897 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
899 struct sk_buff *skb = tx->skb;
900 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
901 struct ieee80211_hdr *hdr = (void *)skb->data;
902 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
906 /* no matter what happens, tx->skb moves to tx->skbs */
907 __skb_queue_tail(&tx->skbs, skb);
910 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
913 if (tx->local->ops->set_frag_threshold)
917 * Warn when submitting a fragmented A-MPDU frame and drop it.
918 * This scenario is handled in ieee80211_tx_prepare but extra
919 * caution taken here as fragmented ampdu may cause Tx stop.
921 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
924 hdrlen = ieee80211_hdrlen(hdr->frame_control);
926 /* internal error, why isn't DONTFRAG set? */
927 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
931 * Now fragment the frame. This will allocate all the fragments and
932 * chain them (using skb as the first fragment) to skb->next.
933 * During transmission, we will remove the successfully transmitted
934 * fragments from this list. When the low-level driver rejects one
935 * of the fragments then we will simply pretend to accept the skb
936 * but store it away as pending.
938 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
941 /* update duration/seq/flags of fragments */
944 skb_queue_walk(&tx->skbs, skb) {
946 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
948 hdr = (void *)skb->data;
949 info = IEEE80211_SKB_CB(skb);
951 if (!skb_queue_is_last(&tx->skbs, skb)) {
952 hdr->frame_control |= morefrags;
954 * No multi-rate retries for fragmented frames, that
955 * would completely throw off the NAV at other STAs.
957 info->control.rates[1].idx = -1;
958 info->control.rates[2].idx = -1;
959 info->control.rates[3].idx = -1;
960 info->control.rates[4].idx = -1;
961 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
962 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
964 hdr->frame_control &= ~morefrags;
967 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
974 static ieee80211_tx_result debug_noinline
975 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
982 tx->sta->tx_packets++;
983 skb_queue_walk(&tx->skbs, skb) {
984 tx->sta->tx_fragments++;
985 tx->sta->tx_bytes += skb->len;
991 static ieee80211_tx_result debug_noinline
992 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
997 switch (tx->key->conf.cipher) {
998 case WLAN_CIPHER_SUITE_WEP40:
999 case WLAN_CIPHER_SUITE_WEP104:
1000 return ieee80211_crypto_wep_encrypt(tx);
1001 case WLAN_CIPHER_SUITE_TKIP:
1002 return ieee80211_crypto_tkip_encrypt(tx);
1003 case WLAN_CIPHER_SUITE_CCMP:
1004 return ieee80211_crypto_ccmp_encrypt(tx);
1005 case WLAN_CIPHER_SUITE_AES_CMAC:
1006 return ieee80211_crypto_aes_cmac_encrypt(tx);
1008 return ieee80211_crypto_hw_encrypt(tx);
1014 static ieee80211_tx_result debug_noinline
1015 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1017 struct sk_buff *skb;
1018 struct ieee80211_hdr *hdr;
1022 skb_queue_walk(&tx->skbs, skb) {
1023 hdr = (void *) skb->data;
1024 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1025 break; /* must not overwrite AID */
1026 if (!skb_queue_is_last(&tx->skbs, skb)) {
1027 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1028 next_len = next->len;
1031 group_addr = is_multicast_ether_addr(hdr->addr1);
1034 ieee80211_duration(tx, skb, group_addr, next_len);
1040 /* actual transmit path */
1042 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1043 struct sk_buff *skb,
1044 struct ieee80211_tx_info *info,
1045 struct tid_ampdu_tx *tid_tx,
1048 bool queued = false;
1049 bool reset_agg_timer = false;
1050 struct sk_buff *purge_skb = NULL;
1052 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1053 info->flags |= IEEE80211_TX_CTL_AMPDU;
1054 reset_agg_timer = true;
1055 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1057 * nothing -- this aggregation session is being started
1058 * but that might still fail with the driver
1061 spin_lock(&tx->sta->lock);
1063 * Need to re-check now, because we may get here
1065 * 1) in the window during which the setup is actually
1066 * already done, but not marked yet because not all
1067 * packets are spliced over to the driver pending
1068 * queue yet -- if this happened we acquire the lock
1069 * either before or after the splice happens, but
1070 * need to recheck which of these cases happened.
1072 * 2) during session teardown, if the OPERATIONAL bit
1073 * was cleared due to the teardown but the pointer
1074 * hasn't been assigned NULL yet (or we loaded it
1075 * before it was assigned) -- in this case it may
1076 * now be NULL which means we should just let the
1077 * packet pass through because splicing the frames
1078 * back is already done.
1080 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1083 /* do nothing, let packet pass through */
1084 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1085 info->flags |= IEEE80211_TX_CTL_AMPDU;
1086 reset_agg_timer = true;
1089 info->control.vif = &tx->sdata->vif;
1090 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1091 __skb_queue_tail(&tid_tx->pending, skb);
1092 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1093 purge_skb = __skb_dequeue(&tid_tx->pending);
1095 spin_unlock(&tx->sta->lock);
1098 dev_kfree_skb(purge_skb);
1101 /* reset session timer */
1102 if (reset_agg_timer && tid_tx->timeout)
1103 tid_tx->last_tx = jiffies;
1111 static ieee80211_tx_result
1112 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1113 struct ieee80211_tx_data *tx,
1114 struct sk_buff *skb)
1116 struct ieee80211_local *local = sdata->local;
1117 struct ieee80211_hdr *hdr;
1118 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1122 memset(tx, 0, sizeof(*tx));
1126 tx->channel = local->hw.conf.channel;
1127 __skb_queue_head_init(&tx->skbs);
1130 * If this flag is set to true anywhere, and we get here,
1131 * we are doing the needed processing, so remove the flag
1134 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1136 hdr = (struct ieee80211_hdr *) skb->data;
1138 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1139 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1140 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1142 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1143 tx->sdata->control_port_protocol == tx->skb->protocol) {
1144 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1147 tx->sta = sta_info_get(sdata, hdr->addr1);
1149 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1150 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1151 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1152 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1153 struct tid_ampdu_tx *tid_tx;
1155 qc = ieee80211_get_qos_ctl(hdr);
1156 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1158 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1162 queued = ieee80211_tx_prep_agg(tx, skb, info,
1165 if (unlikely(queued))
1170 if (is_multicast_ether_addr(hdr->addr1)) {
1171 tx->flags &= ~IEEE80211_TX_UNICAST;
1172 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1174 tx->flags |= IEEE80211_TX_UNICAST;
1176 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1177 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1178 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1179 info->flags & IEEE80211_TX_CTL_AMPDU)
1180 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1184 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1185 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1186 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1188 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1193 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1194 struct ieee80211_vif *vif,
1195 struct ieee80211_sta *sta,
1196 struct sk_buff_head *skbs,
1199 struct sk_buff *skb, *tmp;
1200 unsigned long flags;
1202 skb_queue_walk_safe(skbs, skb, tmp) {
1203 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1204 int q = info->hw_queue;
1206 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1207 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1208 __skb_unlink(skb, skbs);
1214 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1215 if (local->queue_stop_reasons[q] ||
1216 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1218 * Since queue is stopped, queue up frames for later
1219 * transmission from the tx-pending tasklet when the
1220 * queue is woken again.
1223 skb_queue_splice_init(skbs, &local->pending[q]);
1225 skb_queue_splice_tail_init(skbs,
1226 &local->pending[q]);
1228 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1232 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1234 info->control.vif = vif;
1235 info->control.sta = sta;
1237 __skb_unlink(skb, skbs);
1245 * Returns false if the frame couldn't be transmitted but was queued instead.
1247 static bool __ieee80211_tx(struct ieee80211_local *local,
1248 struct sk_buff_head *skbs, int led_len,
1249 struct sta_info *sta, bool txpending)
1251 struct ieee80211_tx_info *info;
1252 struct ieee80211_sub_if_data *sdata;
1253 struct ieee80211_vif *vif;
1254 struct ieee80211_sta *pubsta;
1255 struct sk_buff *skb;
1259 if (WARN_ON(skb_queue_empty(skbs)))
1262 skb = skb_peek(skbs);
1263 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1264 info = IEEE80211_SKB_CB(skb);
1265 sdata = vif_to_sdata(info->control.vif);
1266 if (sta && !sta->uploaded)
1274 switch (sdata->vif.type) {
1275 case NL80211_IFTYPE_MONITOR:
1276 sdata = rcu_dereference(local->monitor_sdata);
1280 vif->hw_queue[skb_get_queue_mapping(skb)];
1281 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1287 case NL80211_IFTYPE_AP_VLAN:
1288 sdata = container_of(sdata->bss,
1289 struct ieee80211_sub_if_data, u.ap);
1296 if (local->ops->tx_frags)
1297 drv_tx_frags(local, vif, pubsta, skbs);
1299 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1302 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1303 ieee80211_led_tx(local, 1);
1305 WARN_ON_ONCE(!skb_queue_empty(skbs));
1311 * Invoke TX handlers, return 0 on success and non-zero if the
1312 * frame was dropped or queued.
1314 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1316 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1317 ieee80211_tx_result res = TX_DROP;
1319 #define CALL_TXH(txh) \
1322 if (res != TX_CONTINUE) \
1326 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1327 CALL_TXH(ieee80211_tx_h_check_assoc);
1328 CALL_TXH(ieee80211_tx_h_ps_buf);
1329 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1330 CALL_TXH(ieee80211_tx_h_select_key);
1331 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1332 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1334 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1335 __skb_queue_tail(&tx->skbs, tx->skb);
1340 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1341 CALL_TXH(ieee80211_tx_h_sequence);
1342 CALL_TXH(ieee80211_tx_h_fragment);
1343 /* handlers after fragment must be aware of tx info fragmentation! */
1344 CALL_TXH(ieee80211_tx_h_stats);
1345 CALL_TXH(ieee80211_tx_h_encrypt);
1346 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1347 CALL_TXH(ieee80211_tx_h_calculate_duration);
1351 if (unlikely(res == TX_DROP)) {
1352 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1354 dev_kfree_skb(tx->skb);
1356 __skb_queue_purge(&tx->skbs);
1358 } else if (unlikely(res == TX_QUEUED)) {
1359 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1367 * Returns false if the frame couldn't be transmitted but was queued instead.
1369 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1370 struct sk_buff *skb, bool txpending)
1372 struct ieee80211_local *local = sdata->local;
1373 struct ieee80211_tx_data tx;
1374 ieee80211_tx_result res_prepare;
1375 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1379 if (unlikely(skb->len < 10)) {
1386 /* initialises tx */
1388 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1390 if (unlikely(res_prepare == TX_DROP)) {
1393 } else if (unlikely(res_prepare == TX_QUEUED)) {
1397 tx.channel = local->hw.conf.channel;
1398 info->band = tx.channel->band;
1400 /* set up hw_queue value early */
1401 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1402 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1404 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1406 if (!invoke_tx_handlers(&tx))
1407 result = __ieee80211_tx(local, &tx.skbs, led_len,
1414 /* device xmit handlers */
1416 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1417 struct sk_buff *skb,
1418 int head_need, bool may_encrypt)
1420 struct ieee80211_local *local = sdata->local;
1423 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1424 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1425 tail_need -= skb_tailroom(skb);
1426 tail_need = max_t(int, tail_need, 0);
1429 if (skb_cloned(skb))
1430 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1431 else if (head_need || tail_need)
1432 I802_DEBUG_INC(local->tx_expand_skb_head);
1436 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1437 wiphy_debug(local->hw.wiphy,
1438 "failed to reallocate TX buffer\n");
1445 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1447 struct ieee80211_local *local = sdata->local;
1448 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1449 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)) {
1469 hdr = (struct ieee80211_hdr *) skb->data;
1470 info->control.vif = &sdata->vif;
1472 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1473 ieee80211_is_data(hdr->frame_control) &&
1474 !is_multicast_ether_addr(hdr->addr1) &&
1475 mesh_nexthop_resolve(skb, sdata)) {
1476 /* skb queued: don't free */
1481 ieee80211_set_qos_hdr(sdata, skb);
1482 ieee80211_tx(sdata, skb, false);
1486 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1488 struct ieee80211_radiotap_iterator iterator;
1489 struct ieee80211_radiotap_header *rthdr =
1490 (struct ieee80211_radiotap_header *) skb->data;
1491 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1492 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1496 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1497 IEEE80211_TX_CTL_DONTFRAG;
1500 * for every radiotap entry that is present
1501 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1502 * entries present, or -EINVAL on error)
1506 ret = ieee80211_radiotap_iterator_next(&iterator);
1511 /* see if this argument is something we can use */
1512 switch (iterator.this_arg_index) {
1514 * You must take care when dereferencing iterator.this_arg
1515 * for multibyte types... the pointer is not aligned. Use
1516 * get_unaligned((type *)iterator.this_arg) to dereference
1517 * iterator.this_arg for type "type" safely on all arches.
1519 case IEEE80211_RADIOTAP_FLAGS:
1520 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1522 * this indicates that the skb we have been
1523 * handed has the 32-bit FCS CRC at the end...
1524 * we should react to that by snipping it off
1525 * because it will be recomputed and added
1528 if (skb->len < (iterator._max_length + FCS_LEN))
1531 skb_trim(skb, skb->len - FCS_LEN);
1533 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1534 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1535 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1536 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1539 case IEEE80211_RADIOTAP_TX_FLAGS:
1540 txflags = get_unaligned_le16(iterator.this_arg);
1541 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1542 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1546 * Please update the file
1547 * Documentation/networking/mac80211-injection.txt
1548 * when parsing new fields here.
1556 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1560 * remove the radiotap header
1561 * iterator->_max_length was sanity-checked against
1562 * skb->len by iterator init
1564 skb_pull(skb, iterator._max_length);
1569 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1570 struct net_device *dev)
1572 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1573 struct ieee80211_channel *chan = local->hw.conf.channel;
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;
1583 * Frame injection is not allowed if beaconing is not allowed
1584 * or if we need radar detection. Beaconing is usually not allowed when
1585 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1586 * Passive scan is also used in world regulatory domains where
1587 * your country is not known and as such it should be treated as
1588 * NO TX unless the channel is explicitly allowed in which case
1589 * your current regulatory domain would not have the passive scan
1592 * Since AP mode uses monitor interfaces to inject/TX management
1593 * frames we can make AP mode the exception to this rule once it
1594 * supports radar detection as its implementation can deal with
1595 * radar detection by itself. We can do that later by adding a
1596 * monitor flag interfaces used for AP support.
1598 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1599 IEEE80211_CHAN_PASSIVE_SCAN)))
1602 /* check for not even having the fixed radiotap header part */
1603 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1604 goto fail; /* too short to be possibly valid */
1606 /* is it a header version we can trust to find length from? */
1607 if (unlikely(prthdr->it_version))
1608 goto fail; /* only version 0 is supported */
1610 /* then there must be a radiotap header with a length we can use */
1611 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1613 /* does the skb contain enough to deliver on the alleged length? */
1614 if (unlikely(skb->len < len_rthdr))
1615 goto fail; /* skb too short for claimed rt header extent */
1618 * fix up the pointers accounting for the radiotap
1619 * header still being in there. We are being given
1620 * a precooked IEEE80211 header so no need for
1623 skb_set_mac_header(skb, len_rthdr);
1625 * these are just fixed to the end of the rt area since we
1626 * don't have any better information and at this point, nobody cares
1628 skb_set_network_header(skb, len_rthdr);
1629 skb_set_transport_header(skb, len_rthdr);
1631 if (skb->len < len_rthdr + 2)
1634 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1635 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1637 if (skb->len < len_rthdr + hdrlen)
1641 * Initialize skb->protocol if the injected frame is a data frame
1642 * carrying a rfc1042 header
1644 if (ieee80211_is_data(hdr->frame_control) &&
1645 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1646 u8 *payload = (u8 *)hdr + hdrlen;
1648 if (ether_addr_equal(payload, rfc1042_header))
1649 skb->protocol = cpu_to_be16((payload[6] << 8) |
1653 memset(info, 0, sizeof(*info));
1655 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1656 IEEE80211_TX_CTL_INJECTED;
1658 /* process and remove the injection radiotap header */
1659 if (!ieee80211_parse_tx_radiotap(skb))
1665 * We process outgoing injected frames that have a local address
1666 * we handle as though they are non-injected frames.
1667 * This code here isn't entirely correct, the local MAC address
1668 * isn't always enough to find the interface to use; for proper
1669 * VLAN/WDS support we will need a different mechanism (which
1670 * likely isn't going to be monitor interfaces).
1672 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1674 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1675 if (!ieee80211_sdata_running(tmp_sdata))
1677 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1678 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1679 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1681 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1687 ieee80211_xmit(sdata, skb);
1690 return NETDEV_TX_OK;
1694 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1698 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1699 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1700 * @skb: packet to be sent
1701 * @dev: incoming interface
1703 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1704 * not be freed, and caller is responsible for either retrying later or freeing
1707 * This function takes in an Ethernet header and encapsulates it with suitable
1708 * IEEE 802.11 header based on which interface the packet is coming in. The
1709 * encapsulated packet will then be passed to master interface, wlan#.11, for
1710 * transmission (through low-level driver).
1712 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1713 struct net_device *dev)
1715 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1716 struct ieee80211_local *local = sdata->local;
1717 struct ieee80211_tx_info *info;
1718 int ret = NETDEV_TX_BUSY, head_need;
1719 u16 ethertype, hdrlen, meshhdrlen = 0;
1721 struct ieee80211_hdr hdr;
1722 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1723 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1724 const u8 *encaps_data;
1725 int encaps_len, skip_header_bytes;
1727 struct sta_info *sta = NULL;
1728 bool wme_sta = false, authorized = false, tdls_auth = false;
1729 bool tdls_direct = false;
1734 if (unlikely(skb->len < ETH_HLEN)) {
1739 /* convert Ethernet header to proper 802.11 header (based on
1740 * operation mode) */
1741 ethertype = (skb->data[12] << 8) | skb->data[13];
1742 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1744 switch (sdata->vif.type) {
1745 case NL80211_IFTYPE_AP_VLAN:
1747 sta = rcu_dereference(sdata->u.vlan.sta);
1749 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1751 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1752 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1753 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1754 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1756 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1757 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1763 case NL80211_IFTYPE_AP:
1764 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1766 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1767 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1768 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1771 case NL80211_IFTYPE_WDS:
1772 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1774 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1775 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1776 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1777 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1780 #ifdef CONFIG_MAC80211_MESH
1781 case NL80211_IFTYPE_MESH_POINT:
1782 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1783 /* Do not send frames with mesh_ttl == 0 */
1784 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1789 if (!is_multicast_ether_addr(skb->data)) {
1790 mpath = mesh_path_lookup(skb->data, sdata);
1792 mppath = mpp_path_lookup(skb->data, sdata);
1796 * Use address extension if it is a packet from
1797 * another interface or if we know the destination
1798 * is being proxied by a portal (i.e. portal address
1799 * differs from proxied address)
1801 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1802 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1803 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1804 skb->data, skb->data + ETH_ALEN);
1806 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1809 int is_mesh_mcast = 1;
1812 if (is_multicast_ether_addr(skb->data))
1813 /* DA TA mSA AE:SA */
1814 mesh_da = skb->data;
1816 static const u8 bcast[ETH_ALEN] =
1817 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1819 /* RA TA mDA mSA AE:DA SA */
1820 mesh_da = mppath->mpp;
1823 /* DA TA mSA AE:SA */
1827 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1828 mesh_da, sdata->vif.addr);
1832 ieee80211_new_mesh_header(&mesh_hdr,
1834 skb->data + ETH_ALEN,
1838 ieee80211_new_mesh_header(&mesh_hdr,
1841 skb->data + ETH_ALEN);
1846 case NL80211_IFTYPE_STATION:
1847 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1848 bool tdls_peer = false;
1851 sta = sta_info_get(sdata, skb->data);
1853 authorized = test_sta_flag(sta,
1854 WLAN_STA_AUTHORIZED);
1855 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1856 tdls_peer = test_sta_flag(sta,
1857 WLAN_STA_TDLS_PEER);
1858 tdls_auth = test_sta_flag(sta,
1859 WLAN_STA_TDLS_PEER_AUTH);
1864 * If the TDLS link is enabled, send everything
1865 * directly. Otherwise, allow TDLS setup frames
1866 * to be transmitted indirectly.
1868 tdls_direct = tdls_peer && (tdls_auth ||
1869 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1870 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1874 /* link during setup - throw out frames to peer */
1881 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1882 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1883 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1885 } else if (sdata->u.mgd.use_4addr &&
1886 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1887 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1888 IEEE80211_FCTL_TODS);
1890 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1891 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1892 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1893 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1896 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1898 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1899 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1900 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1904 case NL80211_IFTYPE_ADHOC:
1906 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1907 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1908 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1917 * There's no need to try to look up the destination
1918 * if it is a multicast address (which can only happen
1921 multicast = is_multicast_ether_addr(hdr.addr1);
1924 sta = sta_info_get(sdata, hdr.addr1);
1926 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1927 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1932 /* For mesh, the use of the QoS header is mandatory */
1933 if (ieee80211_vif_is_mesh(&sdata->vif))
1936 /* receiver and we are QoS enabled, use a QoS type frame */
1937 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1938 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1943 * Drop unicast frames to unauthorised stations unless they are
1944 * EAPOL frames from the local station.
1946 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1947 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1948 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1949 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1950 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1951 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1952 dev->name, hdr.addr1);
1955 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1961 if (unlikely(!multicast && skb->sk &&
1962 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1963 struct sk_buff *orig_skb = skb;
1965 skb = skb_clone(skb, GFP_ATOMIC);
1967 unsigned long flags;
1970 spin_lock_irqsave(&local->ack_status_lock, flags);
1971 r = idr_get_new_above(&local->ack_status_frames,
1974 idr_pre_get(&local->ack_status_frames,
1976 r = idr_get_new_above(&local->ack_status_frames,
1979 if (WARN_ON(!id) || id > 0xffff) {
1980 idr_remove(&local->ack_status_frames, id);
1983 spin_unlock_irqrestore(&local->ack_status_lock, flags);
1987 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1988 } else if (skb_shared(skb)) {
1989 kfree_skb(orig_skb);
1995 /* couldn't clone -- lose tx status ... */
2001 * If the skb is shared we need to obtain our own copy.
2003 if (skb_shared(skb)) {
2004 struct sk_buff *tmp_skb = skb;
2006 /* can't happen -- skb is a clone if info_id != 0 */
2009 skb = skb_clone(skb, GFP_ATOMIC);
2018 hdr.frame_control = fc;
2019 hdr.duration_id = 0;
2022 skip_header_bytes = ETH_HLEN;
2023 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2024 encaps_data = bridge_tunnel_header;
2025 encaps_len = sizeof(bridge_tunnel_header);
2026 skip_header_bytes -= 2;
2027 } else if (ethertype >= 0x600) {
2028 encaps_data = rfc1042_header;
2029 encaps_len = sizeof(rfc1042_header);
2030 skip_header_bytes -= 2;
2036 nh_pos = skb_network_header(skb) - skb->data;
2037 h_pos = skb_transport_header(skb) - skb->data;
2039 skb_pull(skb, skip_header_bytes);
2040 nh_pos -= skip_header_bytes;
2041 h_pos -= skip_header_bytes;
2043 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2046 * So we need to modify the skb header and hence need a copy of
2047 * that. The head_need variable above doesn't, so far, include
2048 * the needed header space that we don't need right away. If we
2049 * can, then we don't reallocate right now but only after the
2050 * frame arrives at the master device (if it does...)
2052 * If we cannot, however, then we will reallocate to include all
2053 * the ever needed space. Also, if we need to reallocate it anyway,
2054 * make it big enough for everything we may ever need.
2057 if (head_need > 0 || skb_cloned(skb)) {
2058 head_need += IEEE80211_ENCRYPT_HEADROOM;
2059 head_need += local->tx_headroom;
2060 head_need = max_t(int, 0, head_need);
2061 if (ieee80211_skb_resize(sdata, skb, head_need, true))
2066 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2067 nh_pos += encaps_len;
2068 h_pos += encaps_len;
2071 #ifdef CONFIG_MAC80211_MESH
2072 if (meshhdrlen > 0) {
2073 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2074 nh_pos += meshhdrlen;
2075 h_pos += meshhdrlen;
2079 if (ieee80211_is_data_qos(fc)) {
2080 __le16 *qos_control;
2082 qos_control = (__le16*) skb_push(skb, 2);
2083 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2085 * Maybe we could actually set some fields here, for now just
2086 * initialise to zero to indicate no special operation.
2090 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2095 dev->stats.tx_packets++;
2096 dev->stats.tx_bytes += skb->len;
2098 /* Update skb pointers to various headers since this modified frame
2099 * is going to go through Linux networking code that may potentially
2100 * need things like pointer to IP header. */
2101 skb_set_mac_header(skb, 0);
2102 skb_set_network_header(skb, nh_pos);
2103 skb_set_transport_header(skb, h_pos);
2105 info = IEEE80211_SKB_CB(skb);
2106 memset(info, 0, sizeof(*info));
2108 dev->trans_start = jiffies;
2110 info->flags = info_flags;
2111 info->ack_frame_id = info_id;
2113 ieee80211_xmit(sdata, skb);
2115 return NETDEV_TX_OK;
2118 if (ret == NETDEV_TX_OK)
2126 * ieee80211_clear_tx_pending may not be called in a context where
2127 * it is possible that it packets could come in again.
2129 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2133 for (i = 0; i < local->hw.queues; i++)
2134 skb_queue_purge(&local->pending[i]);
2138 * Returns false if the frame couldn't be transmitted but was queued instead,
2139 * which in this case means re-queued -- take as an indication to stop sending
2140 * more pending frames.
2142 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2143 struct sk_buff *skb)
2145 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2146 struct ieee80211_sub_if_data *sdata;
2147 struct sta_info *sta;
2148 struct ieee80211_hdr *hdr;
2151 sdata = vif_to_sdata(info->control.vif);
2153 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2154 result = ieee80211_tx(sdata, skb, true);
2156 struct sk_buff_head skbs;
2158 __skb_queue_head_init(&skbs);
2159 __skb_queue_tail(&skbs, skb);
2161 hdr = (struct ieee80211_hdr *)skb->data;
2162 sta = sta_info_get(sdata, hdr->addr1);
2164 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2171 * Transmit all pending packets. Called from tasklet.
2173 void ieee80211_tx_pending(unsigned long data)
2175 struct ieee80211_local *local = (struct ieee80211_local *)data;
2176 unsigned long flags;
2182 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2183 for (i = 0; i < local->hw.queues; i++) {
2185 * If queue is stopped by something other than due to pending
2186 * frames, or we have no pending frames, proceed to next queue.
2188 if (local->queue_stop_reasons[i] ||
2189 skb_queue_empty(&local->pending[i]))
2192 while (!skb_queue_empty(&local->pending[i])) {
2193 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2194 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2196 if (WARN_ON(!info->control.vif)) {
2201 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2204 txok = ieee80211_tx_pending_skb(local, skb);
2205 spin_lock_irqsave(&local->queue_stop_reason_lock,
2211 if (skb_queue_empty(&local->pending[i]))
2212 ieee80211_propagate_queue_wake(local, i);
2214 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2219 /* functions for drivers to get certain frames */
2221 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2222 struct ieee80211_if_ap *bss,
2223 struct sk_buff *skb,
2224 struct beacon_data *beacon)
2228 int i, have_bits = 0, n1, n2;
2230 /* Generate bitmap for TIM only if there are any STAs in power save
2232 if (atomic_read(&bss->num_sta_ps) > 0)
2233 /* in the hope that this is faster than
2234 * checking byte-for-byte */
2235 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2236 IEEE80211_MAX_AID+1);
2238 if (bss->dtim_count == 0)
2239 bss->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2243 tim = pos = (u8 *) skb_put(skb, 6);
2244 *pos++ = WLAN_EID_TIM;
2246 *pos++ = bss->dtim_count;
2247 *pos++ = sdata->vif.bss_conf.dtim_period;
2249 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2252 bss->dtim_bc_mc = aid0 == 1;
2255 /* Find largest even number N1 so that bits numbered 1 through
2256 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2257 * (N2 + 1) x 8 through 2007 are 0. */
2259 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2266 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2273 /* Bitmap control */
2275 /* Part Virt Bitmap */
2276 skb_put(skb, n2 - n1);
2277 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2279 tim[1] = n2 - n1 + 4;
2281 *pos++ = aid0; /* Bitmap control */
2282 *pos++ = 0; /* Part Virt Bitmap */
2286 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2287 struct ieee80211_vif *vif,
2288 u16 *tim_offset, u16 *tim_length)
2290 struct ieee80211_local *local = hw_to_local(hw);
2291 struct sk_buff *skb = NULL;
2292 struct ieee80211_tx_info *info;
2293 struct ieee80211_sub_if_data *sdata = NULL;
2294 struct ieee80211_if_ap *ap = NULL;
2295 struct beacon_data *beacon;
2296 struct ieee80211_supported_band *sband;
2297 enum ieee80211_band band = local->hw.conf.channel->band;
2298 struct ieee80211_tx_rate_control txrc;
2300 sband = local->hw.wiphy->bands[band];
2304 sdata = vif_to_sdata(vif);
2306 if (!ieee80211_sdata_running(sdata))
2314 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2316 beacon = rcu_dereference(ap->beacon);
2319 * headroom, head length,
2320 * tail length and maximum TIM length
2322 skb = dev_alloc_skb(local->tx_headroom +
2324 beacon->tail_len + 256);
2328 skb_reserve(skb, local->tx_headroom);
2329 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2333 * Not very nice, but we want to allow the driver to call
2334 * ieee80211_beacon_get() as a response to the set_tim()
2335 * callback. That, however, is already invoked under the
2336 * sta_lock to guarantee consistent and race-free update
2337 * of the tim bitmap in mac80211 and the driver.
2339 if (local->tim_in_locked_section) {
2340 ieee80211_beacon_add_tim(sdata, ap, skb,
2343 unsigned long flags;
2345 spin_lock_irqsave(&local->tim_lock, flags);
2346 ieee80211_beacon_add_tim(sdata, ap, skb,
2348 spin_unlock_irqrestore(&local->tim_lock, flags);
2352 *tim_offset = beacon->head_len;
2354 *tim_length = skb->len - beacon->head_len;
2357 memcpy(skb_put(skb, beacon->tail_len),
2358 beacon->tail, beacon->tail_len);
2361 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2362 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2363 struct ieee80211_hdr *hdr;
2364 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2369 skb = skb_copy(presp, GFP_ATOMIC);
2373 hdr = (struct ieee80211_hdr *) skb->data;
2374 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2375 IEEE80211_STYPE_BEACON);
2376 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2377 struct ieee80211_mgmt *mgmt;
2378 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2380 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
2381 sizeof(mgmt->u.beacon);
2383 #ifdef CONFIG_MAC80211_MESH
2384 if (!sdata->u.mesh.mesh_id_len)
2388 if (ifmsh->sync_ops)
2389 ifmsh->sync_ops->adjust_tbtt(
2392 skb = dev_alloc_skb(local->tx_headroom +
2395 2 + 8 + /* supported rates */
2396 2 + 3 + /* DS params */
2397 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
2398 2 + sizeof(struct ieee80211_ht_cap) +
2399 2 + sizeof(struct ieee80211_ht_operation) +
2400 2 + sdata->u.mesh.mesh_id_len +
2401 2 + sizeof(struct ieee80211_meshconf_ie) +
2402 sdata->u.mesh.ie_len);
2406 skb_reserve(skb, local->hw.extra_tx_headroom);
2407 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
2408 memset(mgmt, 0, hdr_len);
2409 mgmt->frame_control =
2410 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2411 memset(mgmt->da, 0xff, ETH_ALEN);
2412 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2413 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2414 mgmt->u.beacon.beacon_int =
2415 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2416 mgmt->u.beacon.capab_info |= cpu_to_le16(
2417 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
2419 pos = skb_put(skb, 2);
2420 *pos++ = WLAN_EID_SSID;
2423 if (ieee80211_add_srates_ie(sdata, skb, true) ||
2424 mesh_add_ds_params_ie(skb, sdata) ||
2425 ieee80211_add_ext_srates_ie(sdata, skb, true) ||
2426 mesh_add_rsn_ie(skb, sdata) ||
2427 mesh_add_ht_cap_ie(skb, sdata) ||
2428 mesh_add_ht_oper_ie(skb, sdata) ||
2429 mesh_add_meshid_ie(skb, sdata) ||
2430 mesh_add_meshconf_ie(skb, sdata) ||
2431 mesh_add_vendor_ies(skb, sdata)) {
2432 pr_err("o11s: couldn't add ies!\n");
2440 info = IEEE80211_SKB_CB(skb);
2442 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2443 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2446 memset(&txrc, 0, sizeof(txrc));
2449 txrc.bss_conf = &sdata->vif.bss_conf;
2451 txrc.reported_rate.idx = -1;
2452 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2453 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2454 txrc.max_rate_idx = -1;
2456 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2457 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band],
2458 sizeof(txrc.rate_idx_mcs_mask));
2460 rate_control_get_rate(sdata, NULL, &txrc);
2462 info->control.vif = vif;
2464 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2465 IEEE80211_TX_CTL_ASSIGN_SEQ |
2466 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2471 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2473 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2474 struct ieee80211_vif *vif)
2476 struct ieee80211_if_ap *ap = NULL;
2477 struct sk_buff *presp = NULL, *skb = NULL;
2478 struct ieee80211_hdr *hdr;
2479 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2481 if (sdata->vif.type != NL80211_IFTYPE_AP)
2487 presp = rcu_dereference(ap->probe_resp);
2491 skb = skb_copy(presp, GFP_ATOMIC);
2495 hdr = (struct ieee80211_hdr *) skb->data;
2496 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2502 EXPORT_SYMBOL(ieee80211_proberesp_get);
2504 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2505 struct ieee80211_vif *vif)
2507 struct ieee80211_sub_if_data *sdata;
2508 struct ieee80211_if_managed *ifmgd;
2509 struct ieee80211_pspoll *pspoll;
2510 struct ieee80211_local *local;
2511 struct sk_buff *skb;
2513 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2516 sdata = vif_to_sdata(vif);
2517 ifmgd = &sdata->u.mgd;
2518 local = sdata->local;
2520 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2524 skb_reserve(skb, local->hw.extra_tx_headroom);
2526 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2527 memset(pspoll, 0, sizeof(*pspoll));
2528 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2529 IEEE80211_STYPE_PSPOLL);
2530 pspoll->aid = cpu_to_le16(ifmgd->aid);
2532 /* aid in PS-Poll has its two MSBs each set to 1 */
2533 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2535 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2536 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2540 EXPORT_SYMBOL(ieee80211_pspoll_get);
2542 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2543 struct ieee80211_vif *vif)
2545 struct ieee80211_hdr_3addr *nullfunc;
2546 struct ieee80211_sub_if_data *sdata;
2547 struct ieee80211_if_managed *ifmgd;
2548 struct ieee80211_local *local;
2549 struct sk_buff *skb;
2551 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2554 sdata = vif_to_sdata(vif);
2555 ifmgd = &sdata->u.mgd;
2556 local = sdata->local;
2558 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2562 skb_reserve(skb, local->hw.extra_tx_headroom);
2564 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2566 memset(nullfunc, 0, sizeof(*nullfunc));
2567 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2568 IEEE80211_STYPE_NULLFUNC |
2569 IEEE80211_FCTL_TODS);
2570 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2571 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2572 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2576 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2578 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2579 struct ieee80211_vif *vif,
2580 const u8 *ssid, size_t ssid_len,
2581 const u8 *ie, size_t ie_len)
2583 struct ieee80211_sub_if_data *sdata;
2584 struct ieee80211_local *local;
2585 struct ieee80211_hdr_3addr *hdr;
2586 struct sk_buff *skb;
2590 sdata = vif_to_sdata(vif);
2591 local = sdata->local;
2592 ie_ssid_len = 2 + ssid_len;
2594 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2595 ie_ssid_len + ie_len);
2599 skb_reserve(skb, local->hw.extra_tx_headroom);
2601 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2602 memset(hdr, 0, sizeof(*hdr));
2603 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2604 IEEE80211_STYPE_PROBE_REQ);
2605 memset(hdr->addr1, 0xff, ETH_ALEN);
2606 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2607 memset(hdr->addr3, 0xff, ETH_ALEN);
2609 pos = skb_put(skb, ie_ssid_len);
2610 *pos++ = WLAN_EID_SSID;
2613 memcpy(pos, ssid, ssid_len);
2617 pos = skb_put(skb, ie_len);
2618 memcpy(pos, ie, ie_len);
2623 EXPORT_SYMBOL(ieee80211_probereq_get);
2625 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2626 const void *frame, size_t frame_len,
2627 const struct ieee80211_tx_info *frame_txctl,
2628 struct ieee80211_rts *rts)
2630 const struct ieee80211_hdr *hdr = frame;
2632 rts->frame_control =
2633 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2634 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2636 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2637 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2639 EXPORT_SYMBOL(ieee80211_rts_get);
2641 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2642 const void *frame, size_t frame_len,
2643 const struct ieee80211_tx_info *frame_txctl,
2644 struct ieee80211_cts *cts)
2646 const struct ieee80211_hdr *hdr = frame;
2648 cts->frame_control =
2649 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2650 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2651 frame_len, frame_txctl);
2652 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2654 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2657 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2658 struct ieee80211_vif *vif)
2660 struct ieee80211_local *local = hw_to_local(hw);
2661 struct sk_buff *skb = NULL;
2662 struct ieee80211_tx_data tx;
2663 struct ieee80211_sub_if_data *sdata;
2664 struct ieee80211_if_ap *bss = NULL;
2665 struct beacon_data *beacon;
2666 struct ieee80211_tx_info *info;
2668 sdata = vif_to_sdata(vif);
2672 beacon = rcu_dereference(bss->beacon);
2674 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2677 if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2678 goto out; /* send buffered bc/mc only after DTIM beacon */
2681 skb = skb_dequeue(&bss->ps_bc_buf);
2684 local->total_ps_buffered--;
2686 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2687 struct ieee80211_hdr *hdr =
2688 (struct ieee80211_hdr *) skb->data;
2689 /* more buffered multicast/broadcast frames ==> set
2690 * MoreData flag in IEEE 802.11 header to inform PS
2692 hdr->frame_control |=
2693 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2696 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2698 dev_kfree_skb_any(skb);
2701 info = IEEE80211_SKB_CB(skb);
2703 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2704 tx.channel = local->hw.conf.channel;
2705 info->band = tx.channel->band;
2707 if (invoke_tx_handlers(&tx))
2714 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2716 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
2717 struct sk_buff *skb, int tid)
2719 int ac = ieee802_1d_to_ac[tid];
2721 skb_set_mac_header(skb, 0);
2722 skb_set_network_header(skb, 0);
2723 skb_set_transport_header(skb, 0);
2725 skb_set_queue_mapping(skb, ac);
2726 skb->priority = tid;
2729 * The other path calling ieee80211_xmit is from the tasklet,
2730 * and while we can handle concurrent transmissions locking
2731 * requirements are that we do not come into tx with bhs on.
2734 ieee80211_xmit(sdata, skb);