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);
178 static inline int is_ieee80211_device(struct ieee80211_local *local,
179 struct net_device *dev)
181 return local == wdev_priv(dev->ieee80211_ptr);
185 static ieee80211_tx_result debug_noinline
186 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
188 struct ieee80211_local *local = tx->local;
189 struct ieee80211_if_managed *ifmgd;
191 /* driver doesn't support power save */
192 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
195 /* hardware does dynamic power save */
196 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
199 /* dynamic power save disabled */
200 if (local->hw.conf.dynamic_ps_timeout <= 0)
203 /* we are scanning, don't enable power save */
207 if (!local->ps_sdata)
210 /* No point if we're going to suspend */
211 if (local->quiescing)
214 /* dynamic ps is supported only in managed mode */
215 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
218 ifmgd = &tx->sdata->u.mgd;
221 * Don't wakeup from power save if u-apsd is enabled, voip ac has
222 * u-apsd enabled and the frame is in voip class. This effectively
223 * means that even if all access categories have u-apsd enabled, in
224 * practise u-apsd is only used with the voip ac. This is a
225 * workaround for the case when received voip class packets do not
226 * have correct qos tag for some reason, due the network or the
229 * Note: ifmgd->uapsd_queues access is racy here. If the value is
230 * changed via debugfs, user needs to reassociate manually to have
231 * everything in sync.
233 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
234 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
235 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
238 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
239 ieee80211_stop_queues_by_reason(&local->hw,
240 IEEE80211_QUEUE_STOP_REASON_PS);
241 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
242 ieee80211_queue_work(&local->hw,
243 &local->dynamic_ps_disable_work);
246 /* Don't restart the timer if we're not disassociated */
247 if (!ifmgd->associated)
250 mod_timer(&local->dynamic_ps_timer, jiffies +
251 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
256 static ieee80211_tx_result debug_noinline
257 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
260 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
261 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
264 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
267 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
268 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
269 !ieee80211_is_probe_req(hdr->frame_control) &&
270 !ieee80211_is_nullfunc(hdr->frame_control))
272 * When software scanning only nullfunc frames (to notify
273 * the sleep state to the AP) and probe requests (for the
274 * active scan) are allowed, all other frames should not be
275 * sent and we should not get here, but if we do
276 * nonetheless, drop them to avoid sending them
277 * off-channel. See the link below and
278 * ieee80211_start_scan() for more.
280 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
284 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
287 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
290 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
294 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
296 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
297 if (unlikely(!assoc &&
298 ieee80211_is_data(hdr->frame_control))) {
299 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
300 pr_debug("%s: dropped data frame to not associated station %pM\n",
301 tx->sdata->name, hdr->addr1);
302 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
303 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
306 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
307 ieee80211_is_data(hdr->frame_control) &&
308 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
310 * No associated STAs - no need to send multicast
319 /* This function is called whenever the AP is about to exceed the maximum limit
320 * of buffered frames for power saving STAs. This situation should not really
321 * happen often during normal operation, so dropping the oldest buffered packet
322 * from each queue should be OK to make some room for new frames. */
323 static void purge_old_ps_buffers(struct ieee80211_local *local)
325 int total = 0, purged = 0;
327 struct ieee80211_sub_if_data *sdata;
328 struct sta_info *sta;
331 * virtual interfaces are protected by RCU
335 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
336 struct ieee80211_if_ap *ap;
337 if (sdata->vif.type != NL80211_IFTYPE_AP)
340 skb = skb_dequeue(&ap->ps_bc_buf);
345 total += skb_queue_len(&ap->ps_bc_buf);
349 * Drop one frame from each station from the lowest-priority
350 * AC that has frames at all.
352 list_for_each_entry_rcu(sta, &local->sta_list, list) {
355 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
356 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
357 total += skb_queue_len(&sta->ps_tx_buf[ac]);
368 local->total_ps_buffered = total;
369 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
370 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
375 static ieee80211_tx_result
376 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
378 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
379 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
382 * broadcast/multicast frame
384 * If any of the associated stations is in power save mode,
385 * the frame is buffered to be sent after DTIM beacon frame.
386 * This is done either by the hardware or us.
389 /* powersaving STAs only in AP/VLAN mode */
393 /* no buffering for ordered frames */
394 if (ieee80211_has_order(hdr->frame_control))
397 /* no stations in PS mode */
398 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
401 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
402 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
403 info->hw_queue = tx->sdata->vif.cab_queue;
405 /* device releases frame after DTIM beacon */
406 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
409 /* buffered in mac80211 */
410 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
411 purge_old_ps_buffers(tx->local);
413 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
414 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
415 net_dbg_ratelimited("%s: BC TX buffer full - dropping the oldest frame\n",
418 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
420 tx->local->total_ps_buffered++;
422 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
427 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
430 if (!ieee80211_is_mgmt(fc))
433 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
436 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
443 static ieee80211_tx_result
444 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
446 struct sta_info *sta = tx->sta;
447 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
448 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
449 struct ieee80211_local *local = tx->local;
454 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
455 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
456 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
457 int ac = skb_get_queue_mapping(tx->skb);
459 /* only deauth, disassoc and action are bufferable MMPDUs */
460 if (ieee80211_is_mgmt(hdr->frame_control) &&
461 !ieee80211_is_deauth(hdr->frame_control) &&
462 !ieee80211_is_disassoc(hdr->frame_control) &&
463 !ieee80211_is_action(hdr->frame_control)) {
464 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
468 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
469 pr_debug("STA %pM aid %d: PS buffer for AC %d\n",
470 sta->sta.addr, sta->sta.aid, ac);
471 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
472 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
473 purge_old_ps_buffers(tx->local);
474 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
475 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
476 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
477 net_dbg_ratelimited("%s: STA %pM TX buffer for AC %d full - dropping oldest frame\n",
478 tx->sdata->name, sta->sta.addr, ac);
482 tx->local->total_ps_buffered++;
484 info->control.jiffies = jiffies;
485 info->control.vif = &tx->sdata->vif;
486 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
487 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
489 if (!timer_pending(&local->sta_cleanup))
490 mod_timer(&local->sta_cleanup,
491 round_jiffies(jiffies +
492 STA_INFO_CLEANUP_INTERVAL));
495 * We queued up some frames, so the TIM bit might
496 * need to be set, recalculate it.
498 sta_info_recalc_tim(sta);
502 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
503 else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
504 pr_debug("%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
505 tx->sdata->name, sta->sta.addr);
507 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
512 static ieee80211_tx_result debug_noinline
513 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
515 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
518 if (tx->flags & IEEE80211_TX_UNICAST)
519 return ieee80211_tx_h_unicast_ps_buf(tx);
521 return ieee80211_tx_h_multicast_ps_buf(tx);
524 static ieee80211_tx_result debug_noinline
525 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
527 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
529 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
530 tx->sdata->control_port_no_encrypt))
531 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
536 static ieee80211_tx_result debug_noinline
537 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
539 struct ieee80211_key *key = NULL;
540 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
541 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
543 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
545 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
547 else if (ieee80211_is_mgmt(hdr->frame_control) &&
548 is_multicast_ether_addr(hdr->addr1) &&
549 ieee80211_is_robust_mgmt_frame(hdr) &&
550 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
552 else if (is_multicast_ether_addr(hdr->addr1) &&
553 (key = rcu_dereference(tx->sdata->default_multicast_key)))
555 else if (!is_multicast_ether_addr(hdr->addr1) &&
556 (key = rcu_dereference(tx->sdata->default_unicast_key)))
558 else if (tx->sdata->drop_unencrypted &&
559 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
560 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
561 (!ieee80211_is_robust_mgmt_frame(hdr) ||
562 (ieee80211_is_action(hdr->frame_control) &&
563 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) {
564 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
570 bool skip_hw = false;
572 tx->key->tx_rx_count++;
573 /* TODO: add threshold stuff again */
575 switch (tx->key->conf.cipher) {
576 case WLAN_CIPHER_SUITE_WEP40:
577 case WLAN_CIPHER_SUITE_WEP104:
578 case WLAN_CIPHER_SUITE_TKIP:
579 if (!ieee80211_is_data_present(hdr->frame_control))
582 case WLAN_CIPHER_SUITE_CCMP:
583 if (!ieee80211_is_data_present(hdr->frame_control) &&
584 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
588 skip_hw = (tx->key->conf.flags &
589 IEEE80211_KEY_FLAG_SW_MGMT) &&
590 ieee80211_is_mgmt(hdr->frame_control);
592 case WLAN_CIPHER_SUITE_AES_CMAC:
593 if (!ieee80211_is_mgmt(hdr->frame_control))
598 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
601 if (!skip_hw && tx->key &&
602 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
603 info->control.hw_key = &tx->key->conf;
609 static ieee80211_tx_result debug_noinline
610 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
612 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
613 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
614 struct ieee80211_supported_band *sband;
615 struct ieee80211_rate *rate;
618 bool inval = false, rts = false, short_preamble = false;
619 struct ieee80211_tx_rate_control txrc;
622 memset(&txrc, 0, sizeof(txrc));
624 sband = tx->local->hw.wiphy->bands[tx->channel->band];
626 len = min_t(u32, tx->skb->len + FCS_LEN,
627 tx->local->hw.wiphy->frag_threshold);
629 /* set up the tx rate control struct we give the RC algo */
630 txrc.hw = &tx->local->hw;
632 txrc.bss_conf = &tx->sdata->vif.bss_conf;
634 txrc.reported_rate.idx = -1;
635 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
636 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
637 txrc.max_rate_idx = -1;
639 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
640 memcpy(txrc.rate_idx_mcs_mask,
641 tx->sdata->rc_rateidx_mcs_mask[tx->channel->band],
642 sizeof(txrc.rate_idx_mcs_mask));
643 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
644 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
645 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
647 /* set up RTS protection if desired */
648 if (len > tx->local->hw.wiphy->rts_threshold) {
649 txrc.rts = rts = true;
653 * Use short preamble if the BSS can handle it, but not for
654 * management frames unless we know the receiver can handle
655 * that -- the management frame might be to a station that
656 * just wants a probe response.
658 if (tx->sdata->vif.bss_conf.use_short_preamble &&
659 (ieee80211_is_data(hdr->frame_control) ||
660 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
661 txrc.short_preamble = short_preamble = true;
664 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
667 * Lets not bother rate control if we're associated and cannot
668 * talk to the sta. This should not happen.
670 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
671 !rate_usable_index_exists(sband, &tx->sta->sta),
672 "%s: Dropped data frame as no usable bitrate found while "
673 "scanning and associated. Target station: "
674 "%pM on %d GHz band\n",
675 tx->sdata->name, hdr->addr1,
676 tx->channel->band ? 5 : 2))
680 * If we're associated with the sta at this point we know we can at
681 * least send the frame at the lowest bit rate.
683 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
685 if (unlikely(info->control.rates[0].idx < 0))
688 if (txrc.reported_rate.idx < 0) {
689 txrc.reported_rate = info->control.rates[0];
690 if (tx->sta && ieee80211_is_data(hdr->frame_control))
691 tx->sta->last_tx_rate = txrc.reported_rate;
693 tx->sta->last_tx_rate = txrc.reported_rate;
695 if (unlikely(!info->control.rates[0].count))
696 info->control.rates[0].count = 1;
698 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
699 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
700 info->control.rates[0].count = 1;
702 if (is_multicast_ether_addr(hdr->addr1)) {
704 * XXX: verify the rate is in the basic rateset
710 * set up the RTS/CTS rate as the fastest basic rate
711 * that is not faster than the data rate
713 * XXX: Should this check all retry rates?
715 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
718 rate = &sband->bitrates[info->control.rates[0].idx];
720 for (i = 0; i < sband->n_bitrates; i++) {
721 /* must be a basic rate */
722 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
724 /* must not be faster than the data rate */
725 if (sband->bitrates[i].bitrate > rate->bitrate)
728 if (sband->bitrates[baserate].bitrate <
729 sband->bitrates[i].bitrate)
733 info->control.rts_cts_rate_idx = baserate;
736 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
738 * make sure there's no valid rate following
739 * an invalid one, just in case drivers don't
740 * take the API seriously to stop at -1.
743 info->control.rates[i].idx = -1;
746 if (info->control.rates[i].idx < 0) {
752 * For now assume MCS is already set up correctly, this
755 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
756 WARN_ON(info->control.rates[i].idx > 76);
760 /* set up RTS protection if desired */
762 info->control.rates[i].flags |=
763 IEEE80211_TX_RC_USE_RTS_CTS;
766 if (WARN_ON_ONCE(info->control.rates[i].idx >=
767 sband->n_bitrates)) {
768 info->control.rates[i].idx = -1;
772 rate = &sband->bitrates[info->control.rates[i].idx];
774 /* set up short preamble */
775 if (short_preamble &&
776 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
777 info->control.rates[i].flags |=
778 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
780 /* set up G protection */
781 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
782 rate->flags & IEEE80211_RATE_ERP_G)
783 info->control.rates[i].flags |=
784 IEEE80211_TX_RC_USE_CTS_PROTECT;
790 static ieee80211_tx_result debug_noinline
791 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
793 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
794 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
800 * Packet injection may want to control the sequence
801 * number, if we have no matching interface then we
802 * neither assign one ourselves nor ask the driver to.
804 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
807 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
810 if (ieee80211_hdrlen(hdr->frame_control) < 24)
813 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
817 * Anything but QoS data that has a sequence number field
818 * (is long enough) gets a sequence number from the global
821 if (!ieee80211_is_data_qos(hdr->frame_control)) {
822 /* driver should assign sequence number */
823 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
824 /* for pure STA mode without beacons, we can do it */
825 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
826 tx->sdata->sequence_number += 0x10;
831 * This should be true for injected/management frames only, for
832 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
833 * above since they are not QoS-data frames.
838 /* include per-STA, per-TID sequence counter */
840 qc = ieee80211_get_qos_ctl(hdr);
841 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
842 seq = &tx->sta->tid_seq[tid];
844 hdr->seq_ctrl = cpu_to_le16(*seq);
846 /* Increase the sequence number. */
847 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
852 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
853 struct sk_buff *skb, int hdrlen,
856 struct ieee80211_local *local = tx->local;
857 struct ieee80211_tx_info *info;
859 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
860 int pos = hdrlen + per_fragm;
861 int rem = skb->len - hdrlen - per_fragm;
863 if (WARN_ON(rem < 0))
866 /* first fragment was already added to queue by caller */
869 int fraglen = per_fragm;
874 tmp = dev_alloc_skb(local->tx_headroom +
876 IEEE80211_ENCRYPT_HEADROOM +
877 IEEE80211_ENCRYPT_TAILROOM);
881 __skb_queue_tail(&tx->skbs, tmp);
883 skb_reserve(tmp, local->tx_headroom +
884 IEEE80211_ENCRYPT_HEADROOM);
885 /* copy control information */
886 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
888 info = IEEE80211_SKB_CB(tmp);
889 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
890 IEEE80211_TX_CTL_FIRST_FRAGMENT);
893 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
895 skb_copy_queue_mapping(tmp, skb);
896 tmp->priority = skb->priority;
899 /* copy header and data */
900 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
901 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
906 /* adjust first fragment's length */
907 skb->len = hdrlen + per_fragm;
911 static ieee80211_tx_result debug_noinline
912 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
914 struct sk_buff *skb = tx->skb;
915 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
916 struct ieee80211_hdr *hdr = (void *)skb->data;
917 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
921 /* no matter what happens, tx->skb moves to tx->skbs */
922 __skb_queue_tail(&tx->skbs, skb);
925 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
928 if (tx->local->ops->set_frag_threshold)
932 * Warn when submitting a fragmented A-MPDU frame and drop it.
933 * This scenario is handled in ieee80211_tx_prepare but extra
934 * caution taken here as fragmented ampdu may cause Tx stop.
936 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
939 hdrlen = ieee80211_hdrlen(hdr->frame_control);
941 /* internal error, why isn't DONTFRAG set? */
942 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
946 * Now fragment the frame. This will allocate all the fragments and
947 * chain them (using skb as the first fragment) to skb->next.
948 * During transmission, we will remove the successfully transmitted
949 * fragments from this list. When the low-level driver rejects one
950 * of the fragments then we will simply pretend to accept the skb
951 * but store it away as pending.
953 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
956 /* update duration/seq/flags of fragments */
959 skb_queue_walk(&tx->skbs, skb) {
961 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
963 hdr = (void *)skb->data;
964 info = IEEE80211_SKB_CB(skb);
966 if (!skb_queue_is_last(&tx->skbs, skb)) {
967 hdr->frame_control |= morefrags;
969 * No multi-rate retries for fragmented frames, that
970 * would completely throw off the NAV at other STAs.
972 info->control.rates[1].idx = -1;
973 info->control.rates[2].idx = -1;
974 info->control.rates[3].idx = -1;
975 info->control.rates[4].idx = -1;
976 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
977 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
979 hdr->frame_control &= ~morefrags;
982 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
989 static ieee80211_tx_result debug_noinline
990 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
997 tx->sta->tx_packets++;
998 skb_queue_walk(&tx->skbs, skb) {
999 tx->sta->tx_fragments++;
1000 tx->sta->tx_bytes += skb->len;
1006 static ieee80211_tx_result debug_noinline
1007 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1012 switch (tx->key->conf.cipher) {
1013 case WLAN_CIPHER_SUITE_WEP40:
1014 case WLAN_CIPHER_SUITE_WEP104:
1015 return ieee80211_crypto_wep_encrypt(tx);
1016 case WLAN_CIPHER_SUITE_TKIP:
1017 return ieee80211_crypto_tkip_encrypt(tx);
1018 case WLAN_CIPHER_SUITE_CCMP:
1019 return ieee80211_crypto_ccmp_encrypt(tx);
1020 case WLAN_CIPHER_SUITE_AES_CMAC:
1021 return ieee80211_crypto_aes_cmac_encrypt(tx);
1023 return ieee80211_crypto_hw_encrypt(tx);
1029 static ieee80211_tx_result debug_noinline
1030 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1032 struct sk_buff *skb;
1033 struct ieee80211_hdr *hdr;
1037 skb_queue_walk(&tx->skbs, skb) {
1038 hdr = (void *) skb->data;
1039 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1040 break; /* must not overwrite AID */
1041 if (!skb_queue_is_last(&tx->skbs, skb)) {
1042 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1043 next_len = next->len;
1046 group_addr = is_multicast_ether_addr(hdr->addr1);
1049 ieee80211_duration(tx, skb, group_addr, next_len);
1055 /* actual transmit path */
1057 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1058 struct sk_buff *skb,
1059 struct ieee80211_tx_info *info,
1060 struct tid_ampdu_tx *tid_tx,
1063 bool queued = false;
1064 bool reset_agg_timer = false;
1065 struct sk_buff *purge_skb = NULL;
1067 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1068 info->flags |= IEEE80211_TX_CTL_AMPDU;
1069 reset_agg_timer = true;
1070 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1072 * nothing -- this aggregation session is being started
1073 * but that might still fail with the driver
1076 spin_lock(&tx->sta->lock);
1078 * Need to re-check now, because we may get here
1080 * 1) in the window during which the setup is actually
1081 * already done, but not marked yet because not all
1082 * packets are spliced over to the driver pending
1083 * queue yet -- if this happened we acquire the lock
1084 * either before or after the splice happens, but
1085 * need to recheck which of these cases happened.
1087 * 2) during session teardown, if the OPERATIONAL bit
1088 * was cleared due to the teardown but the pointer
1089 * hasn't been assigned NULL yet (or we loaded it
1090 * before it was assigned) -- in this case it may
1091 * now be NULL which means we should just let the
1092 * packet pass through because splicing the frames
1093 * back is already done.
1095 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1098 /* do nothing, let packet pass through */
1099 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1100 info->flags |= IEEE80211_TX_CTL_AMPDU;
1101 reset_agg_timer = true;
1104 info->control.vif = &tx->sdata->vif;
1105 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1106 __skb_queue_tail(&tid_tx->pending, skb);
1107 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1108 purge_skb = __skb_dequeue(&tid_tx->pending);
1110 spin_unlock(&tx->sta->lock);
1113 dev_kfree_skb(purge_skb);
1116 /* reset session timer */
1117 if (reset_agg_timer && tid_tx->timeout)
1118 tid_tx->last_tx = jiffies;
1126 static ieee80211_tx_result
1127 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1128 struct ieee80211_tx_data *tx,
1129 struct sk_buff *skb)
1131 struct ieee80211_local *local = sdata->local;
1132 struct ieee80211_hdr *hdr;
1133 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1137 memset(tx, 0, sizeof(*tx));
1141 tx->channel = local->hw.conf.channel;
1142 __skb_queue_head_init(&tx->skbs);
1145 * If this flag is set to true anywhere, and we get here,
1146 * we are doing the needed processing, so remove the flag
1149 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1151 hdr = (struct ieee80211_hdr *) skb->data;
1153 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1154 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1155 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1157 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1158 tx->sdata->control_port_protocol == tx->skb->protocol) {
1159 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1162 tx->sta = sta_info_get(sdata, hdr->addr1);
1164 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1165 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1166 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1167 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1168 struct tid_ampdu_tx *tid_tx;
1170 qc = ieee80211_get_qos_ctl(hdr);
1171 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1173 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1177 queued = ieee80211_tx_prep_agg(tx, skb, info,
1180 if (unlikely(queued))
1185 if (is_multicast_ether_addr(hdr->addr1)) {
1186 tx->flags &= ~IEEE80211_TX_UNICAST;
1187 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1189 tx->flags |= IEEE80211_TX_UNICAST;
1191 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1192 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1193 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1194 info->flags & IEEE80211_TX_CTL_AMPDU)
1195 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1199 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1200 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1201 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1203 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1208 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1209 struct ieee80211_vif *vif,
1210 struct ieee80211_sta *sta,
1211 struct sk_buff_head *skbs,
1214 struct sk_buff *skb, *tmp;
1215 unsigned long flags;
1217 skb_queue_walk_safe(skbs, skb, tmp) {
1218 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1219 int q = info->hw_queue;
1221 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1222 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1223 __skb_unlink(skb, skbs);
1229 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1230 if (local->queue_stop_reasons[q] ||
1231 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1233 * Since queue is stopped, queue up frames for later
1234 * transmission from the tx-pending tasklet when the
1235 * queue is woken again.
1238 skb_queue_splice_init(skbs, &local->pending[q]);
1240 skb_queue_splice_tail_init(skbs,
1241 &local->pending[q]);
1243 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1247 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1249 info->control.vif = vif;
1250 info->control.sta = sta;
1252 __skb_unlink(skb, skbs);
1260 * Returns false if the frame couldn't be transmitted but was queued instead.
1262 static bool __ieee80211_tx(struct ieee80211_local *local,
1263 struct sk_buff_head *skbs, int led_len,
1264 struct sta_info *sta, bool txpending)
1266 struct ieee80211_tx_info *info;
1267 struct ieee80211_sub_if_data *sdata;
1268 struct ieee80211_vif *vif;
1269 struct ieee80211_sta *pubsta;
1270 struct sk_buff *skb;
1274 if (WARN_ON(skb_queue_empty(skbs)))
1277 skb = skb_peek(skbs);
1278 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1279 info = IEEE80211_SKB_CB(skb);
1280 sdata = vif_to_sdata(info->control.vif);
1281 if (sta && !sta->uploaded)
1289 switch (sdata->vif.type) {
1290 case NL80211_IFTYPE_MONITOR:
1291 sdata = rcu_dereference(local->monitor_sdata);
1295 vif->hw_queue[skb_get_queue_mapping(skb)];
1296 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1302 case NL80211_IFTYPE_AP_VLAN:
1303 sdata = container_of(sdata->bss,
1304 struct ieee80211_sub_if_data, u.ap);
1311 if (local->ops->tx_frags)
1312 drv_tx_frags(local, vif, pubsta, skbs);
1314 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1317 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1318 ieee80211_led_tx(local, 1);
1320 WARN_ON_ONCE(!skb_queue_empty(skbs));
1326 * Invoke TX handlers, return 0 on success and non-zero if the
1327 * frame was dropped or queued.
1329 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1331 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1332 ieee80211_tx_result res = TX_DROP;
1334 #define CALL_TXH(txh) \
1337 if (res != TX_CONTINUE) \
1341 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1342 CALL_TXH(ieee80211_tx_h_check_assoc);
1343 CALL_TXH(ieee80211_tx_h_ps_buf);
1344 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1345 CALL_TXH(ieee80211_tx_h_select_key);
1346 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1347 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1349 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1350 __skb_queue_tail(&tx->skbs, tx->skb);
1355 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1356 CALL_TXH(ieee80211_tx_h_sequence);
1357 CALL_TXH(ieee80211_tx_h_fragment);
1358 /* handlers after fragment must be aware of tx info fragmentation! */
1359 CALL_TXH(ieee80211_tx_h_stats);
1360 CALL_TXH(ieee80211_tx_h_encrypt);
1361 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1362 CALL_TXH(ieee80211_tx_h_calculate_duration);
1366 if (unlikely(res == TX_DROP)) {
1367 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1369 dev_kfree_skb(tx->skb);
1371 __skb_queue_purge(&tx->skbs);
1373 } else if (unlikely(res == TX_QUEUED)) {
1374 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1382 * Returns false if the frame couldn't be transmitted but was queued instead.
1384 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1385 struct sk_buff *skb, bool txpending)
1387 struct ieee80211_local *local = sdata->local;
1388 struct ieee80211_tx_data tx;
1389 ieee80211_tx_result res_prepare;
1390 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1394 if (unlikely(skb->len < 10)) {
1401 /* initialises tx */
1403 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1405 if (unlikely(res_prepare == TX_DROP)) {
1408 } else if (unlikely(res_prepare == TX_QUEUED)) {
1412 tx.channel = local->hw.conf.channel;
1413 info->band = tx.channel->band;
1415 /* set up hw_queue value early */
1416 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1417 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1419 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1421 if (!invoke_tx_handlers(&tx))
1422 result = __ieee80211_tx(local, &tx.skbs, led_len,
1429 /* device xmit handlers */
1431 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1432 struct sk_buff *skb,
1433 int head_need, bool may_encrypt)
1435 struct ieee80211_local *local = sdata->local;
1438 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1439 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1440 tail_need -= skb_tailroom(skb);
1441 tail_need = max_t(int, tail_need, 0);
1444 if (skb_cloned(skb))
1445 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1446 else if (head_need || tail_need)
1447 I802_DEBUG_INC(local->tx_expand_skb_head);
1451 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1452 wiphy_debug(local->hw.wiphy,
1453 "failed to reallocate TX buffer\n");
1460 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1462 struct ieee80211_local *local = sdata->local;
1463 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1464 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1470 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1472 headroom = local->tx_headroom;
1474 headroom += IEEE80211_ENCRYPT_HEADROOM;
1475 headroom -= skb_headroom(skb);
1476 headroom = max_t(int, 0, headroom);
1478 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1484 hdr = (struct ieee80211_hdr *) skb->data;
1485 info->control.vif = &sdata->vif;
1487 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1488 ieee80211_is_data(hdr->frame_control) &&
1489 !is_multicast_ether_addr(hdr->addr1) &&
1490 mesh_nexthop_resolve(skb, sdata)) {
1491 /* skb queued: don't free */
1496 ieee80211_set_qos_hdr(sdata, skb);
1497 ieee80211_tx(sdata, skb, false);
1501 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1503 struct ieee80211_radiotap_iterator iterator;
1504 struct ieee80211_radiotap_header *rthdr =
1505 (struct ieee80211_radiotap_header *) skb->data;
1506 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1507 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1511 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1512 IEEE80211_TX_CTL_DONTFRAG;
1515 * for every radiotap entry that is present
1516 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1517 * entries present, or -EINVAL on error)
1521 ret = ieee80211_radiotap_iterator_next(&iterator);
1526 /* see if this argument is something we can use */
1527 switch (iterator.this_arg_index) {
1529 * You must take care when dereferencing iterator.this_arg
1530 * for multibyte types... the pointer is not aligned. Use
1531 * get_unaligned((type *)iterator.this_arg) to dereference
1532 * iterator.this_arg for type "type" safely on all arches.
1534 case IEEE80211_RADIOTAP_FLAGS:
1535 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1537 * this indicates that the skb we have been
1538 * handed has the 32-bit FCS CRC at the end...
1539 * we should react to that by snipping it off
1540 * because it will be recomputed and added
1543 if (skb->len < (iterator._max_length + FCS_LEN))
1546 skb_trim(skb, skb->len - FCS_LEN);
1548 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1549 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1550 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1551 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1554 case IEEE80211_RADIOTAP_TX_FLAGS:
1555 txflags = get_unaligned_le16(iterator.this_arg);
1556 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1557 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1561 * Please update the file
1562 * Documentation/networking/mac80211-injection.txt
1563 * when parsing new fields here.
1571 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1575 * remove the radiotap header
1576 * iterator->_max_length was sanity-checked against
1577 * skb->len by iterator init
1579 skb_pull(skb, iterator._max_length);
1584 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1585 struct net_device *dev)
1587 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1588 struct ieee80211_channel *chan = local->hw.conf.channel;
1589 struct ieee80211_radiotap_header *prthdr =
1590 (struct ieee80211_radiotap_header *)skb->data;
1591 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1592 struct ieee80211_hdr *hdr;
1593 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1598 * Frame injection is not allowed if beaconing is not allowed
1599 * or if we need radar detection. Beaconing is usually not allowed when
1600 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1601 * Passive scan is also used in world regulatory domains where
1602 * your country is not known and as such it should be treated as
1603 * NO TX unless the channel is explicitly allowed in which case
1604 * your current regulatory domain would not have the passive scan
1607 * Since AP mode uses monitor interfaces to inject/TX management
1608 * frames we can make AP mode the exception to this rule once it
1609 * supports radar detection as its implementation can deal with
1610 * radar detection by itself. We can do that later by adding a
1611 * monitor flag interfaces used for AP support.
1613 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1614 IEEE80211_CHAN_PASSIVE_SCAN)))
1617 /* check for not even having the fixed radiotap header part */
1618 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1619 goto fail; /* too short to be possibly valid */
1621 /* is it a header version we can trust to find length from? */
1622 if (unlikely(prthdr->it_version))
1623 goto fail; /* only version 0 is supported */
1625 /* then there must be a radiotap header with a length we can use */
1626 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1628 /* does the skb contain enough to deliver on the alleged length? */
1629 if (unlikely(skb->len < len_rthdr))
1630 goto fail; /* skb too short for claimed rt header extent */
1633 * fix up the pointers accounting for the radiotap
1634 * header still being in there. We are being given
1635 * a precooked IEEE80211 header so no need for
1638 skb_set_mac_header(skb, len_rthdr);
1640 * these are just fixed to the end of the rt area since we
1641 * don't have any better information and at this point, nobody cares
1643 skb_set_network_header(skb, len_rthdr);
1644 skb_set_transport_header(skb, len_rthdr);
1646 if (skb->len < len_rthdr + 2)
1649 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1650 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1652 if (skb->len < len_rthdr + hdrlen)
1656 * Initialize skb->protocol if the injected frame is a data frame
1657 * carrying a rfc1042 header
1659 if (ieee80211_is_data(hdr->frame_control) &&
1660 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1661 u8 *payload = (u8 *)hdr + hdrlen;
1663 if (ether_addr_equal(payload, rfc1042_header))
1664 skb->protocol = cpu_to_be16((payload[6] << 8) |
1668 memset(info, 0, sizeof(*info));
1670 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1671 IEEE80211_TX_CTL_INJECTED;
1673 /* process and remove the injection radiotap header */
1674 if (!ieee80211_parse_tx_radiotap(skb))
1680 * We process outgoing injected frames that have a local address
1681 * we handle as though they are non-injected frames.
1682 * This code here isn't entirely correct, the local MAC address
1683 * isn't always enough to find the interface to use; for proper
1684 * VLAN/WDS support we will need a different mechanism (which
1685 * likely isn't going to be monitor interfaces).
1687 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1689 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1690 if (!ieee80211_sdata_running(tmp_sdata))
1692 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1693 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1694 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1696 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1702 ieee80211_xmit(sdata, skb);
1705 return NETDEV_TX_OK;
1709 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1713 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1714 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1715 * @skb: packet to be sent
1716 * @dev: incoming interface
1718 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1719 * not be freed, and caller is responsible for either retrying later or freeing
1722 * This function takes in an Ethernet header and encapsulates it with suitable
1723 * IEEE 802.11 header based on which interface the packet is coming in. The
1724 * encapsulated packet will then be passed to master interface, wlan#.11, for
1725 * transmission (through low-level driver).
1727 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1728 struct net_device *dev)
1730 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1731 struct ieee80211_local *local = sdata->local;
1732 struct ieee80211_tx_info *info;
1733 int ret = NETDEV_TX_BUSY, head_need;
1734 u16 ethertype, hdrlen, meshhdrlen = 0;
1736 struct ieee80211_hdr hdr;
1737 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1738 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1739 const u8 *encaps_data;
1740 int encaps_len, skip_header_bytes;
1742 struct sta_info *sta = NULL;
1743 bool wme_sta = false, authorized = false, tdls_auth = false;
1744 bool tdls_direct = false;
1749 if (unlikely(skb->len < ETH_HLEN)) {
1754 /* convert Ethernet header to proper 802.11 header (based on
1755 * operation mode) */
1756 ethertype = (skb->data[12] << 8) | skb->data[13];
1757 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1759 switch (sdata->vif.type) {
1760 case NL80211_IFTYPE_AP_VLAN:
1762 sta = rcu_dereference(sdata->u.vlan.sta);
1764 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1766 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1767 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1768 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1769 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1771 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1772 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1778 case NL80211_IFTYPE_AP:
1779 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1781 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1782 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1783 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1786 case NL80211_IFTYPE_WDS:
1787 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1789 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1790 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1791 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1792 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1795 #ifdef CONFIG_MAC80211_MESH
1796 case NL80211_IFTYPE_MESH_POINT:
1797 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1798 /* Do not send frames with mesh_ttl == 0 */
1799 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1804 if (!is_multicast_ether_addr(skb->data)) {
1805 mpath = mesh_path_lookup(skb->data, sdata);
1807 mppath = mpp_path_lookup(skb->data, sdata);
1811 * Use address extension if it is a packet from
1812 * another interface or if we know the destination
1813 * is being proxied by a portal (i.e. portal address
1814 * differs from proxied address)
1816 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1817 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1818 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1819 skb->data, skb->data + ETH_ALEN);
1821 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1824 int is_mesh_mcast = 1;
1827 if (is_multicast_ether_addr(skb->data))
1828 /* DA TA mSA AE:SA */
1829 mesh_da = skb->data;
1831 static const u8 bcast[ETH_ALEN] =
1832 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1834 /* RA TA mDA mSA AE:DA SA */
1835 mesh_da = mppath->mpp;
1838 /* DA TA mSA AE:SA */
1842 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1843 mesh_da, sdata->vif.addr);
1847 ieee80211_new_mesh_header(&mesh_hdr,
1849 skb->data + ETH_ALEN,
1853 ieee80211_new_mesh_header(&mesh_hdr,
1856 skb->data + ETH_ALEN);
1861 case NL80211_IFTYPE_STATION:
1862 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1863 bool tdls_peer = false;
1866 sta = sta_info_get(sdata, skb->data);
1868 authorized = test_sta_flag(sta,
1869 WLAN_STA_AUTHORIZED);
1870 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1871 tdls_peer = test_sta_flag(sta,
1872 WLAN_STA_TDLS_PEER);
1873 tdls_auth = test_sta_flag(sta,
1874 WLAN_STA_TDLS_PEER_AUTH);
1879 * If the TDLS link is enabled, send everything
1880 * directly. Otherwise, allow TDLS setup frames
1881 * to be transmitted indirectly.
1883 tdls_direct = tdls_peer && (tdls_auth ||
1884 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1885 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1889 /* link during setup - throw out frames to peer */
1896 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1897 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1898 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1900 } else if (sdata->u.mgd.use_4addr &&
1901 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1902 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1903 IEEE80211_FCTL_TODS);
1905 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1906 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1907 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1908 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1911 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1913 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1914 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1915 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1919 case NL80211_IFTYPE_ADHOC:
1921 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1922 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1923 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1932 * There's no need to try to look up the destination
1933 * if it is a multicast address (which can only happen
1936 multicast = is_multicast_ether_addr(hdr.addr1);
1939 sta = sta_info_get(sdata, hdr.addr1);
1941 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1942 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1947 /* For mesh, the use of the QoS header is mandatory */
1948 if (ieee80211_vif_is_mesh(&sdata->vif))
1951 /* receiver and we are QoS enabled, use a QoS type frame */
1952 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1953 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1958 * Drop unicast frames to unauthorised stations unless they are
1959 * EAPOL frames from the local station.
1961 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1962 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1963 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1964 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1965 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1966 net_dbg_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1967 dev->name, hdr.addr1);
1970 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1976 if (unlikely(!multicast && skb->sk &&
1977 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1978 struct sk_buff *orig_skb = skb;
1980 skb = skb_clone(skb, GFP_ATOMIC);
1982 unsigned long flags;
1985 spin_lock_irqsave(&local->ack_status_lock, flags);
1986 r = idr_get_new_above(&local->ack_status_frames,
1989 idr_pre_get(&local->ack_status_frames,
1991 r = idr_get_new_above(&local->ack_status_frames,
1994 if (WARN_ON(!id) || id > 0xffff) {
1995 idr_remove(&local->ack_status_frames, id);
1998 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2002 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2003 } else if (skb_shared(skb)) {
2004 kfree_skb(orig_skb);
2010 /* couldn't clone -- lose tx status ... */
2016 * If the skb is shared we need to obtain our own copy.
2018 if (skb_shared(skb)) {
2019 struct sk_buff *tmp_skb = skb;
2021 /* can't happen -- skb is a clone if info_id != 0 */
2024 skb = skb_clone(skb, GFP_ATOMIC);
2033 hdr.frame_control = fc;
2034 hdr.duration_id = 0;
2037 skip_header_bytes = ETH_HLEN;
2038 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2039 encaps_data = bridge_tunnel_header;
2040 encaps_len = sizeof(bridge_tunnel_header);
2041 skip_header_bytes -= 2;
2042 } else if (ethertype >= 0x600) {
2043 encaps_data = rfc1042_header;
2044 encaps_len = sizeof(rfc1042_header);
2045 skip_header_bytes -= 2;
2051 nh_pos = skb_network_header(skb) - skb->data;
2052 h_pos = skb_transport_header(skb) - skb->data;
2054 skb_pull(skb, skip_header_bytes);
2055 nh_pos -= skip_header_bytes;
2056 h_pos -= skip_header_bytes;
2058 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2061 * So we need to modify the skb header and hence need a copy of
2062 * that. The head_need variable above doesn't, so far, include
2063 * the needed header space that we don't need right away. If we
2064 * can, then we don't reallocate right now but only after the
2065 * frame arrives at the master device (if it does...)
2067 * If we cannot, however, then we will reallocate to include all
2068 * the ever needed space. Also, if we need to reallocate it anyway,
2069 * make it big enough for everything we may ever need.
2072 if (head_need > 0 || skb_cloned(skb)) {
2073 head_need += IEEE80211_ENCRYPT_HEADROOM;
2074 head_need += local->tx_headroom;
2075 head_need = max_t(int, 0, head_need);
2076 if (ieee80211_skb_resize(sdata, skb, head_need, true))
2081 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2082 nh_pos += encaps_len;
2083 h_pos += encaps_len;
2086 #ifdef CONFIG_MAC80211_MESH
2087 if (meshhdrlen > 0) {
2088 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2089 nh_pos += meshhdrlen;
2090 h_pos += meshhdrlen;
2094 if (ieee80211_is_data_qos(fc)) {
2095 __le16 *qos_control;
2097 qos_control = (__le16*) skb_push(skb, 2);
2098 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2100 * Maybe we could actually set some fields here, for now just
2101 * initialise to zero to indicate no special operation.
2105 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2110 dev->stats.tx_packets++;
2111 dev->stats.tx_bytes += skb->len;
2113 /* Update skb pointers to various headers since this modified frame
2114 * is going to go through Linux networking code that may potentially
2115 * need things like pointer to IP header. */
2116 skb_set_mac_header(skb, 0);
2117 skb_set_network_header(skb, nh_pos);
2118 skb_set_transport_header(skb, h_pos);
2120 info = IEEE80211_SKB_CB(skb);
2121 memset(info, 0, sizeof(*info));
2123 dev->trans_start = jiffies;
2125 info->flags = info_flags;
2126 info->ack_frame_id = info_id;
2128 ieee80211_xmit(sdata, skb);
2130 return NETDEV_TX_OK;
2133 if (ret == NETDEV_TX_OK)
2141 * ieee80211_clear_tx_pending may not be called in a context where
2142 * it is possible that it packets could come in again.
2144 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2148 for (i = 0; i < local->hw.queues; i++)
2149 skb_queue_purge(&local->pending[i]);
2153 * Returns false if the frame couldn't be transmitted but was queued instead,
2154 * which in this case means re-queued -- take as an indication to stop sending
2155 * more pending frames.
2157 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2158 struct sk_buff *skb)
2160 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2161 struct ieee80211_sub_if_data *sdata;
2162 struct sta_info *sta;
2163 struct ieee80211_hdr *hdr;
2166 sdata = vif_to_sdata(info->control.vif);
2168 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2169 result = ieee80211_tx(sdata, skb, true);
2171 struct sk_buff_head skbs;
2173 __skb_queue_head_init(&skbs);
2174 __skb_queue_tail(&skbs, skb);
2176 hdr = (struct ieee80211_hdr *)skb->data;
2177 sta = sta_info_get(sdata, hdr->addr1);
2179 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2186 * Transmit all pending packets. Called from tasklet.
2188 void ieee80211_tx_pending(unsigned long data)
2190 struct ieee80211_local *local = (struct ieee80211_local *)data;
2191 unsigned long flags;
2197 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2198 for (i = 0; i < local->hw.queues; i++) {
2200 * If queue is stopped by something other than due to pending
2201 * frames, or we have no pending frames, proceed to next queue.
2203 if (local->queue_stop_reasons[i] ||
2204 skb_queue_empty(&local->pending[i]))
2207 while (!skb_queue_empty(&local->pending[i])) {
2208 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2209 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2211 if (WARN_ON(!info->control.vif)) {
2216 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2219 txok = ieee80211_tx_pending_skb(local, skb);
2220 spin_lock_irqsave(&local->queue_stop_reason_lock,
2226 if (skb_queue_empty(&local->pending[i]))
2227 ieee80211_propagate_queue_wake(local, i);
2229 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2234 /* functions for drivers to get certain frames */
2236 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2237 struct ieee80211_if_ap *bss,
2238 struct sk_buff *skb,
2239 struct beacon_data *beacon)
2243 int i, have_bits = 0, n1, n2;
2245 /* Generate bitmap for TIM only if there are any STAs in power save
2247 if (atomic_read(&bss->num_sta_ps) > 0)
2248 /* in the hope that this is faster than
2249 * checking byte-for-byte */
2250 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2251 IEEE80211_MAX_AID+1);
2253 if (bss->dtim_count == 0)
2254 bss->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2258 tim = pos = (u8 *) skb_put(skb, 6);
2259 *pos++ = WLAN_EID_TIM;
2261 *pos++ = bss->dtim_count;
2262 *pos++ = sdata->vif.bss_conf.dtim_period;
2264 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2267 bss->dtim_bc_mc = aid0 == 1;
2270 /* Find largest even number N1 so that bits numbered 1 through
2271 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2272 * (N2 + 1) x 8 through 2007 are 0. */
2274 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2281 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2288 /* Bitmap control */
2290 /* Part Virt Bitmap */
2291 skb_put(skb, n2 - n1);
2292 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2294 tim[1] = n2 - n1 + 4;
2296 *pos++ = aid0; /* Bitmap control */
2297 *pos++ = 0; /* Part Virt Bitmap */
2301 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2302 struct ieee80211_vif *vif,
2303 u16 *tim_offset, u16 *tim_length)
2305 struct ieee80211_local *local = hw_to_local(hw);
2306 struct sk_buff *skb = NULL;
2307 struct ieee80211_tx_info *info;
2308 struct ieee80211_sub_if_data *sdata = NULL;
2309 struct ieee80211_if_ap *ap = NULL;
2310 struct beacon_data *beacon;
2311 struct ieee80211_supported_band *sband;
2312 enum ieee80211_band band = local->hw.conf.channel->band;
2313 struct ieee80211_tx_rate_control txrc;
2315 sband = local->hw.wiphy->bands[band];
2319 sdata = vif_to_sdata(vif);
2321 if (!ieee80211_sdata_running(sdata))
2329 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2331 beacon = rcu_dereference(ap->beacon);
2334 * headroom, head length,
2335 * tail length and maximum TIM length
2337 skb = dev_alloc_skb(local->tx_headroom +
2339 beacon->tail_len + 256);
2343 skb_reserve(skb, local->tx_headroom);
2344 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2348 * Not very nice, but we want to allow the driver to call
2349 * ieee80211_beacon_get() as a response to the set_tim()
2350 * callback. That, however, is already invoked under the
2351 * sta_lock to guarantee consistent and race-free update
2352 * of the tim bitmap in mac80211 and the driver.
2354 if (local->tim_in_locked_section) {
2355 ieee80211_beacon_add_tim(sdata, ap, skb,
2358 unsigned long flags;
2360 spin_lock_irqsave(&local->tim_lock, flags);
2361 ieee80211_beacon_add_tim(sdata, ap, skb,
2363 spin_unlock_irqrestore(&local->tim_lock, flags);
2367 *tim_offset = beacon->head_len;
2369 *tim_length = skb->len - beacon->head_len;
2372 memcpy(skb_put(skb, beacon->tail_len),
2373 beacon->tail, beacon->tail_len);
2376 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2377 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2378 struct ieee80211_hdr *hdr;
2379 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2384 skb = skb_copy(presp, GFP_ATOMIC);
2388 hdr = (struct ieee80211_hdr *) skb->data;
2389 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2390 IEEE80211_STYPE_BEACON);
2391 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2392 struct ieee80211_mgmt *mgmt;
2393 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2395 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
2396 sizeof(mgmt->u.beacon);
2398 #ifdef CONFIG_MAC80211_MESH
2399 if (!sdata->u.mesh.mesh_id_len)
2403 if (ifmsh->sync_ops)
2404 ifmsh->sync_ops->adjust_tbtt(
2407 skb = dev_alloc_skb(local->tx_headroom +
2410 2 + 8 + /* supported rates */
2411 2 + 3 + /* DS params */
2412 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
2413 2 + sizeof(struct ieee80211_ht_cap) +
2414 2 + sizeof(struct ieee80211_ht_operation) +
2415 2 + sdata->u.mesh.mesh_id_len +
2416 2 + sizeof(struct ieee80211_meshconf_ie) +
2417 sdata->u.mesh.ie_len);
2421 skb_reserve(skb, local->hw.extra_tx_headroom);
2422 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
2423 memset(mgmt, 0, hdr_len);
2424 mgmt->frame_control =
2425 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2426 memset(mgmt->da, 0xff, ETH_ALEN);
2427 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2428 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2429 mgmt->u.beacon.beacon_int =
2430 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2431 mgmt->u.beacon.capab_info |= cpu_to_le16(
2432 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
2434 pos = skb_put(skb, 2);
2435 *pos++ = WLAN_EID_SSID;
2438 if (ieee80211_add_srates_ie(&sdata->vif, skb, true) ||
2439 mesh_add_ds_params_ie(skb, sdata) ||
2440 ieee80211_add_ext_srates_ie(&sdata->vif, skb, true) ||
2441 mesh_add_rsn_ie(skb, sdata) ||
2442 mesh_add_ht_cap_ie(skb, sdata) ||
2443 mesh_add_ht_oper_ie(skb, sdata) ||
2444 mesh_add_meshid_ie(skb, sdata) ||
2445 mesh_add_meshconf_ie(skb, sdata) ||
2446 mesh_add_vendor_ies(skb, sdata)) {
2447 pr_err("o11s: couldn't add ies!\n");
2455 info = IEEE80211_SKB_CB(skb);
2457 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2458 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2461 memset(&txrc, 0, sizeof(txrc));
2464 txrc.bss_conf = &sdata->vif.bss_conf;
2466 txrc.reported_rate.idx = -1;
2467 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2468 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2469 txrc.max_rate_idx = -1;
2471 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2472 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band],
2473 sizeof(txrc.rate_idx_mcs_mask));
2475 rate_control_get_rate(sdata, NULL, &txrc);
2477 info->control.vif = vif;
2479 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2480 IEEE80211_TX_CTL_ASSIGN_SEQ |
2481 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2486 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2488 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2489 struct ieee80211_vif *vif)
2491 struct ieee80211_if_ap *ap = NULL;
2492 struct sk_buff *presp = NULL, *skb = NULL;
2493 struct ieee80211_hdr *hdr;
2494 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2496 if (sdata->vif.type != NL80211_IFTYPE_AP)
2502 presp = rcu_dereference(ap->probe_resp);
2506 skb = skb_copy(presp, GFP_ATOMIC);
2510 hdr = (struct ieee80211_hdr *) skb->data;
2511 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2517 EXPORT_SYMBOL(ieee80211_proberesp_get);
2519 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2520 struct ieee80211_vif *vif)
2522 struct ieee80211_sub_if_data *sdata;
2523 struct ieee80211_if_managed *ifmgd;
2524 struct ieee80211_pspoll *pspoll;
2525 struct ieee80211_local *local;
2526 struct sk_buff *skb;
2528 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2531 sdata = vif_to_sdata(vif);
2532 ifmgd = &sdata->u.mgd;
2533 local = sdata->local;
2535 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2539 skb_reserve(skb, local->hw.extra_tx_headroom);
2541 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2542 memset(pspoll, 0, sizeof(*pspoll));
2543 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2544 IEEE80211_STYPE_PSPOLL);
2545 pspoll->aid = cpu_to_le16(ifmgd->aid);
2547 /* aid in PS-Poll has its two MSBs each set to 1 */
2548 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2550 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2551 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2555 EXPORT_SYMBOL(ieee80211_pspoll_get);
2557 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2558 struct ieee80211_vif *vif)
2560 struct ieee80211_hdr_3addr *nullfunc;
2561 struct ieee80211_sub_if_data *sdata;
2562 struct ieee80211_if_managed *ifmgd;
2563 struct ieee80211_local *local;
2564 struct sk_buff *skb;
2566 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2569 sdata = vif_to_sdata(vif);
2570 ifmgd = &sdata->u.mgd;
2571 local = sdata->local;
2573 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2577 skb_reserve(skb, local->hw.extra_tx_headroom);
2579 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2581 memset(nullfunc, 0, sizeof(*nullfunc));
2582 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2583 IEEE80211_STYPE_NULLFUNC |
2584 IEEE80211_FCTL_TODS);
2585 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2586 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2587 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2591 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2593 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2594 struct ieee80211_vif *vif,
2595 const u8 *ssid, size_t ssid_len,
2596 const u8 *ie, size_t ie_len)
2598 struct ieee80211_sub_if_data *sdata;
2599 struct ieee80211_local *local;
2600 struct ieee80211_hdr_3addr *hdr;
2601 struct sk_buff *skb;
2605 sdata = vif_to_sdata(vif);
2606 local = sdata->local;
2607 ie_ssid_len = 2 + ssid_len;
2609 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2610 ie_ssid_len + ie_len);
2614 skb_reserve(skb, local->hw.extra_tx_headroom);
2616 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2617 memset(hdr, 0, sizeof(*hdr));
2618 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2619 IEEE80211_STYPE_PROBE_REQ);
2620 memset(hdr->addr1, 0xff, ETH_ALEN);
2621 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2622 memset(hdr->addr3, 0xff, ETH_ALEN);
2624 pos = skb_put(skb, ie_ssid_len);
2625 *pos++ = WLAN_EID_SSID;
2628 memcpy(pos, ssid, ssid_len);
2632 pos = skb_put(skb, ie_len);
2633 memcpy(pos, ie, ie_len);
2638 EXPORT_SYMBOL(ieee80211_probereq_get);
2640 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2641 const void *frame, size_t frame_len,
2642 const struct ieee80211_tx_info *frame_txctl,
2643 struct ieee80211_rts *rts)
2645 const struct ieee80211_hdr *hdr = frame;
2647 rts->frame_control =
2648 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2649 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2651 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2652 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2654 EXPORT_SYMBOL(ieee80211_rts_get);
2656 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2657 const void *frame, size_t frame_len,
2658 const struct ieee80211_tx_info *frame_txctl,
2659 struct ieee80211_cts *cts)
2661 const struct ieee80211_hdr *hdr = frame;
2663 cts->frame_control =
2664 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2665 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2666 frame_len, frame_txctl);
2667 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2669 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2672 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2673 struct ieee80211_vif *vif)
2675 struct ieee80211_local *local = hw_to_local(hw);
2676 struct sk_buff *skb = NULL;
2677 struct ieee80211_tx_data tx;
2678 struct ieee80211_sub_if_data *sdata;
2679 struct ieee80211_if_ap *bss = NULL;
2680 struct beacon_data *beacon;
2681 struct ieee80211_tx_info *info;
2683 sdata = vif_to_sdata(vif);
2687 beacon = rcu_dereference(bss->beacon);
2689 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2692 if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2693 goto out; /* send buffered bc/mc only after DTIM beacon */
2696 skb = skb_dequeue(&bss->ps_bc_buf);
2699 local->total_ps_buffered--;
2701 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2702 struct ieee80211_hdr *hdr =
2703 (struct ieee80211_hdr *) skb->data;
2704 /* more buffered multicast/broadcast frames ==> set
2705 * MoreData flag in IEEE 802.11 header to inform PS
2707 hdr->frame_control |=
2708 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2711 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2713 dev_kfree_skb_any(skb);
2716 info = IEEE80211_SKB_CB(skb);
2718 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2719 tx.channel = local->hw.conf.channel;
2720 info->band = tx.channel->band;
2722 if (invoke_tx_handlers(&tx))
2729 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2731 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
2732 struct sk_buff *skb, int tid)
2734 int ac = ieee802_1d_to_ac[tid];
2736 skb_set_mac_header(skb, 0);
2737 skb_set_network_header(skb, 0);
2738 skb_set_transport_header(skb, 0);
2740 skb_set_queue_mapping(skb, ac);
2741 skb->priority = tid;
2744 * The other path calling ieee80211_xmit is from the tasklet,
2745 * and while we can handle concurrent transmissions locking
2746 * requirements are that we do not come into tx with bhs on.
2749 ieee80211_xmit(sdata, skb);