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 <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
36 #define IEEE80211_TX_OK 0
37 #define IEEE80211_TX_AGAIN 1
38 #define IEEE80211_TX_PENDING 2
42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
45 int rate, mrate, erp, dur, i;
46 struct ieee80211_rate *txrate;
47 struct ieee80211_local *local = tx->local;
48 struct ieee80211_supported_band *sband;
49 struct ieee80211_hdr *hdr;
50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
52 /* assume HW handles this */
53 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
57 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
60 sband = local->hw.wiphy->bands[tx->channel->band];
61 txrate = &sband->bitrates[info->control.rates[0].idx];
63 erp = txrate->flags & IEEE80211_RATE_ERP_G;
66 * data and mgmt (except PS Poll):
68 * - during contention period:
69 * if addr1 is group address: 0
70 * if more fragments = 0 and addr1 is individual address: time to
71 * transmit one ACK plus SIFS
72 * if more fragments = 1 and addr1 is individual address: time to
73 * transmit next fragment plus 2 x ACK plus 3 x SIFS
76 * - control response frame (CTS or ACK) shall be transmitted using the
77 * same rate as the immediately previous frame in the frame exchange
78 * sequence, if this rate belongs to the PHY mandatory rates, or else
79 * at the highest possible rate belonging to the PHY rates in the
82 hdr = (struct ieee80211_hdr *)tx->skb->data;
83 if (ieee80211_is_ctl(hdr->frame_control)) {
84 /* TODO: These control frames are not currently sent by
85 * mac80211, but should they be implemented, this function
86 * needs to be updated to support duration field calculation.
88 * RTS: time needed to transmit pending data/mgmt frame plus
89 * one CTS frame plus one ACK frame plus 3 x SIFS
90 * CTS: duration of immediately previous RTS minus time
91 * required to transmit CTS and its SIFS
92 * ACK: 0 if immediately previous directed data/mgmt had
93 * more=0, with more=1 duration in ACK frame is duration
94 * from previous frame minus time needed to transmit ACK
96 * PS Poll: BIT(15) | BIT(14) | aid
102 if (0 /* FIX: data/mgmt during CFP */)
103 return cpu_to_le16(32768);
105 if (group_addr) /* Group address as the destination - no ACK */
108 /* Individual destination address:
109 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
110 * CTS and ACK frames shall be transmitted using the highest rate in
111 * basic rate set that is less than or equal to the rate of the
112 * immediately previous frame and that is using the same modulation
113 * (CCK or OFDM). If no basic rate set matches with these requirements,
114 * the highest mandatory rate of the PHY that is less than or equal to
115 * the rate of the previous frame is used.
116 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
119 /* use lowest available if everything fails */
120 mrate = sband->bitrates[0].bitrate;
121 for (i = 0; i < sband->n_bitrates; i++) {
122 struct ieee80211_rate *r = &sband->bitrates[i];
124 if (r->bitrate > txrate->bitrate)
127 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
130 switch (sband->band) {
131 case IEEE80211_BAND_2GHZ: {
133 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
134 flag = IEEE80211_RATE_MANDATORY_G;
136 flag = IEEE80211_RATE_MANDATORY_B;
141 case IEEE80211_BAND_5GHZ:
142 if (r->flags & IEEE80211_RATE_MANDATORY_A)
145 case IEEE80211_NUM_BANDS:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Time needed to transmit ACK
157 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
158 * to closest integer */
160 dur = ieee80211_frame_duration(local, 10, rate, erp,
161 tx->sdata->vif.bss_conf.use_short_preamble);
164 /* Frame is fragmented: duration increases with time needed to
165 * transmit next fragment plus ACK and 2 x SIFS. */
166 dur *= 2; /* ACK + SIFS */
168 dur += ieee80211_frame_duration(local, next_frag_len,
169 txrate->bitrate, erp,
170 tx->sdata->vif.bss_conf.use_short_preamble);
173 return cpu_to_le16(dur);
176 static int inline is_ieee80211_device(struct ieee80211_local *local,
177 struct net_device *dev)
179 return local == wdev_priv(dev->ieee80211_ptr);
183 static ieee80211_tx_result debug_noinline
184 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
186 struct ieee80211_local *local = tx->local;
187 struct ieee80211_if_managed *ifmgd;
189 /* driver doesn't support power save */
190 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
193 /* hardware does dynamic power save */
194 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
197 /* dynamic power save disabled */
198 if (local->hw.conf.dynamic_ps_timeout <= 0)
201 /* we are scanning, don't enable power save */
205 if (!local->ps_sdata)
208 /* No point if we're going to suspend */
209 if (local->quiescing)
212 /* dynamic ps is supported only in managed mode */
213 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
216 ifmgd = &tx->sdata->u.mgd;
219 * Don't wakeup from power save if u-apsd is enabled, voip ac has
220 * u-apsd enabled and the frame is in voip class. This effectively
221 * means that even if all access categories have u-apsd enabled, in
222 * practise u-apsd is only used with the voip ac. This is a
223 * workaround for the case when received voip class packets do not
224 * have correct qos tag for some reason, due the network or the
227 * Note: local->uapsd_queues access is racy here. If the value is
228 * changed via debugfs, user needs to reassociate manually to have
229 * everything in sync.
231 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
232 && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
233 && skb_get_queue_mapping(tx->skb) == 0)
236 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
237 ieee80211_stop_queues_by_reason(&local->hw,
238 IEEE80211_QUEUE_STOP_REASON_PS);
239 ieee80211_queue_work(&local->hw,
240 &local->dynamic_ps_disable_work);
243 mod_timer(&local->dynamic_ps_timer, jiffies +
244 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
249 static ieee80211_tx_result debug_noinline
250 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
253 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
254 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
257 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
260 if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) &&
261 !ieee80211_is_probe_req(hdr->frame_control) &&
262 !ieee80211_is_nullfunc(hdr->frame_control))
264 * When software scanning only nullfunc frames (to notify
265 * the sleep state to the AP) and probe requests (for the
266 * active scan) are allowed, all other frames should not be
267 * sent and we should not get here, but if we do
268 * nonetheless, drop them to avoid sending them
269 * off-channel. See the link below and
270 * ieee80211_start_scan() for more.
272 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
276 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
279 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
282 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
285 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
287 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
288 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
289 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
290 ieee80211_is_data(hdr->frame_control))) {
291 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
292 printk(KERN_DEBUG "%s: dropped data frame to not "
293 "associated station %pM\n",
294 tx->sdata->name, hdr->addr1);
295 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
296 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
300 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
301 tx->local->num_sta == 0 &&
302 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
304 * No associated STAs - no need to send multicast
315 /* This function is called whenever the AP is about to exceed the maximum limit
316 * of buffered frames for power saving STAs. This situation should not really
317 * happen often during normal operation, so dropping the oldest buffered packet
318 * from each queue should be OK to make some room for new frames. */
319 static void purge_old_ps_buffers(struct ieee80211_local *local)
321 int total = 0, purged = 0;
323 struct ieee80211_sub_if_data *sdata;
324 struct sta_info *sta;
327 * virtual interfaces are protected by RCU
331 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
332 struct ieee80211_if_ap *ap;
333 if (sdata->vif.type != NL80211_IFTYPE_AP)
336 skb = skb_dequeue(&ap->ps_bc_buf);
341 total += skb_queue_len(&ap->ps_bc_buf);
344 list_for_each_entry_rcu(sta, &local->sta_list, list) {
345 skb = skb_dequeue(&sta->ps_tx_buf);
350 total += skb_queue_len(&sta->ps_tx_buf);
355 local->total_ps_buffered = total;
356 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
357 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
362 static ieee80211_tx_result
363 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
365 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
366 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
369 * broadcast/multicast frame
371 * If any of the associated stations is in power save mode,
372 * the frame is buffered to be sent after DTIM beacon frame.
373 * This is done either by the hardware or us.
376 /* powersaving STAs only in AP/VLAN mode */
380 /* no buffering for ordered frames */
381 if (ieee80211_has_order(hdr->frame_control))
384 /* no stations in PS mode */
385 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
388 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
390 /* device releases frame after DTIM beacon */
391 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
394 /* buffered in mac80211 */
395 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
396 purge_old_ps_buffers(tx->local);
398 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
399 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
401 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
404 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
406 tx->local->total_ps_buffered++;
408 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
413 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
416 if (!ieee80211_is_mgmt(fc))
419 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
422 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
429 static ieee80211_tx_result
430 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
432 struct sta_info *sta = tx->sta;
433 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
434 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
435 struct ieee80211_local *local = tx->local;
439 ieee80211_is_probe_resp(hdr->frame_control) ||
440 ieee80211_is_auth(hdr->frame_control) ||
441 ieee80211_is_assoc_resp(hdr->frame_control) ||
442 ieee80211_is_reassoc_resp(hdr->frame_control)))
445 staflags = get_sta_flags(sta);
447 if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) &&
448 !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) {
449 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
450 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
452 sta->sta.addr, sta->sta.aid,
453 skb_queue_len(&sta->ps_tx_buf));
454 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
455 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
456 purge_old_ps_buffers(tx->local);
457 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
458 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
459 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
460 if (net_ratelimit()) {
461 printk(KERN_DEBUG "%s: STA %pM TX "
462 "buffer full - dropping oldest frame\n",
463 tx->sdata->name, sta->sta.addr);
468 tx->local->total_ps_buffered++;
471 * Queue frame to be sent after STA wakes up/polls,
472 * but don't set the TIM bit if the driver is blocking
473 * wakeup or poll response transmissions anyway.
475 if (skb_queue_empty(&sta->ps_tx_buf) &&
476 !(staflags & WLAN_STA_PS_DRIVER))
477 sta_info_set_tim_bit(sta);
479 info->control.jiffies = jiffies;
480 info->control.vif = &tx->sdata->vif;
481 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
482 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
484 if (!timer_pending(&local->sta_cleanup))
485 mod_timer(&local->sta_cleanup,
486 round_jiffies(jiffies +
487 STA_INFO_CLEANUP_INTERVAL));
491 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
492 else if (unlikely(staflags & WLAN_STA_PS_STA)) {
493 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
494 "set -> send frame\n", tx->sdata->name,
497 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
502 static ieee80211_tx_result debug_noinline
503 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
505 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
508 if (tx->flags & IEEE80211_TX_UNICAST)
509 return ieee80211_tx_h_unicast_ps_buf(tx);
511 return ieee80211_tx_h_multicast_ps_buf(tx);
514 static ieee80211_tx_result debug_noinline
515 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
517 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
519 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
520 tx->sdata->control_port_no_encrypt))
521 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
526 static ieee80211_tx_result debug_noinline
527 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
529 struct ieee80211_key *key = NULL;
530 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
531 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
533 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
535 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
537 else if (ieee80211_is_mgmt(hdr->frame_control) &&
538 is_multicast_ether_addr(hdr->addr1) &&
539 ieee80211_is_robust_mgmt_frame(hdr) &&
540 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
542 else if ((key = rcu_dereference(tx->sdata->default_key)))
544 else if (tx->sdata->drop_unencrypted &&
545 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
546 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
547 (!ieee80211_is_robust_mgmt_frame(hdr) ||
548 (ieee80211_is_action(hdr->frame_control) &&
549 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
550 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
556 bool skip_hw = false;
558 tx->key->tx_rx_count++;
559 /* TODO: add threshold stuff again */
561 switch (tx->key->conf.cipher) {
562 case WLAN_CIPHER_SUITE_WEP40:
563 case WLAN_CIPHER_SUITE_WEP104:
564 if (ieee80211_is_auth(hdr->frame_control))
566 case WLAN_CIPHER_SUITE_TKIP:
567 if (!ieee80211_is_data_present(hdr->frame_control))
570 case WLAN_CIPHER_SUITE_CCMP:
571 if (!ieee80211_is_data_present(hdr->frame_control) &&
572 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
576 skip_hw = (tx->key->conf.flags &
577 IEEE80211_KEY_FLAG_SW_MGMT) &&
578 ieee80211_is_mgmt(hdr->frame_control);
580 case WLAN_CIPHER_SUITE_AES_CMAC:
581 if (!ieee80211_is_mgmt(hdr->frame_control))
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 = local_to_hw(tx->local);
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 txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP;
627 /* set up RTS protection if desired */
628 if (len > tx->local->hw.wiphy->rts_threshold) {
629 txrc.rts = rts = true;
633 * Use short preamble if the BSS can handle it, but not for
634 * management frames unless we know the receiver can handle
635 * that -- the management frame might be to a station that
636 * just wants a probe response.
638 if (tx->sdata->vif.bss_conf.use_short_preamble &&
639 (ieee80211_is_data(hdr->frame_control) ||
640 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
641 txrc.short_preamble = short_preamble = true;
643 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
646 * Lets not bother rate control if we're associated and cannot
647 * talk to the sta. This should not happen.
649 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
650 (sta_flags & WLAN_STA_ASSOC) &&
651 !rate_usable_index_exists(sband, &tx->sta->sta),
652 "%s: Dropped data frame as no usable bitrate found while "
653 "scanning and associated. Target station: "
654 "%pM on %d GHz band\n",
655 tx->sdata->name, hdr->addr1,
656 tx->channel->band ? 5 : 2))
660 * If we're associated with the sta at this point we know we can at
661 * least send the frame at the lowest bit rate.
663 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
665 if (unlikely(info->control.rates[0].idx < 0))
668 if (txrc.reported_rate.idx < 0)
669 txrc.reported_rate = info->control.rates[0];
672 tx->sta->last_tx_rate = txrc.reported_rate;
674 if (unlikely(!info->control.rates[0].count))
675 info->control.rates[0].count = 1;
677 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
678 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
679 info->control.rates[0].count = 1;
681 if (is_multicast_ether_addr(hdr->addr1)) {
683 * XXX: verify the rate is in the basic rateset
689 * set up the RTS/CTS rate as the fastest basic rate
690 * that is not faster than the data rate
692 * XXX: Should this check all retry rates?
694 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
697 rate = &sband->bitrates[info->control.rates[0].idx];
699 for (i = 0; i < sband->n_bitrates; i++) {
700 /* must be a basic rate */
701 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
703 /* must not be faster than the data rate */
704 if (sband->bitrates[i].bitrate > rate->bitrate)
707 if (sband->bitrates[baserate].bitrate <
708 sband->bitrates[i].bitrate)
712 info->control.rts_cts_rate_idx = baserate;
715 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
717 * make sure there's no valid rate following
718 * an invalid one, just in case drivers don't
719 * take the API seriously to stop at -1.
722 info->control.rates[i].idx = -1;
725 if (info->control.rates[i].idx < 0) {
731 * For now assume MCS is already set up correctly, this
734 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
735 WARN_ON(info->control.rates[i].idx > 76);
739 /* set up RTS protection if desired */
741 info->control.rates[i].flags |=
742 IEEE80211_TX_RC_USE_RTS_CTS;
745 if (WARN_ON_ONCE(info->control.rates[i].idx >=
746 sband->n_bitrates)) {
747 info->control.rates[i].idx = -1;
751 rate = &sband->bitrates[info->control.rates[i].idx];
753 /* set up short preamble */
754 if (short_preamble &&
755 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
756 info->control.rates[i].flags |=
757 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
759 /* set up G protection */
760 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
761 rate->flags & IEEE80211_RATE_ERP_G)
762 info->control.rates[i].flags |=
763 IEEE80211_TX_RC_USE_CTS_PROTECT;
769 static ieee80211_tx_result debug_noinline
770 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
772 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
773 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
779 * Packet injection may want to control the sequence
780 * number, if we have no matching interface then we
781 * neither assign one ourselves nor ask the driver to.
783 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
786 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
789 if (ieee80211_hdrlen(hdr->frame_control) < 24)
793 * Anything but QoS data that has a sequence number field
794 * (is long enough) gets a sequence number from the global
797 if (!ieee80211_is_data_qos(hdr->frame_control)) {
798 /* driver should assign sequence number */
799 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
800 /* for pure STA mode without beacons, we can do it */
801 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
802 tx->sdata->sequence_number += 0x10;
807 * This should be true for injected/management frames only, for
808 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
809 * above since they are not QoS-data frames.
814 /* include per-STA, per-TID sequence counter */
816 qc = ieee80211_get_qos_ctl(hdr);
817 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
818 seq = &tx->sta->tid_seq[tid];
820 hdr->seq_ctrl = cpu_to_le16(*seq);
822 /* Increase the sequence number. */
823 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
828 static int ieee80211_fragment(struct ieee80211_local *local,
829 struct sk_buff *skb, int hdrlen,
832 struct sk_buff *tail = skb, *tmp;
833 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
834 int pos = hdrlen + per_fragm;
835 int rem = skb->len - hdrlen - per_fragm;
837 if (WARN_ON(rem < 0))
841 int fraglen = per_fragm;
846 tmp = dev_alloc_skb(local->tx_headroom +
848 IEEE80211_ENCRYPT_HEADROOM +
849 IEEE80211_ENCRYPT_TAILROOM);
854 skb_reserve(tmp, local->tx_headroom +
855 IEEE80211_ENCRYPT_HEADROOM);
856 /* copy control information */
857 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
858 skb_copy_queue_mapping(tmp, skb);
859 tmp->priority = skb->priority;
862 /* copy header and data */
863 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
864 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
869 skb->len = hdrlen + per_fragm;
873 static ieee80211_tx_result debug_noinline
874 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
876 struct sk_buff *skb = tx->skb;
877 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
878 struct ieee80211_hdr *hdr = (void *)skb->data;
879 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
883 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
887 * Warn when submitting a fragmented A-MPDU frame and drop it.
888 * This scenario is handled in ieee80211_tx_prepare but extra
889 * caution taken here as fragmented ampdu may cause Tx stop.
891 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
894 hdrlen = ieee80211_hdrlen(hdr->frame_control);
896 /* internal error, why is TX_FRAGMENTED set? */
897 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
901 * Now fragment the frame. This will allocate all the fragments and
902 * chain them (using skb as the first fragment) to skb->next.
903 * During transmission, we will remove the successfully transmitted
904 * fragments from this list. When the low-level driver rejects one
905 * of the fragments then we will simply pretend to accept the skb
906 * but store it away as pending.
908 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
911 /* update duration/seq/flags of fragments */
915 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
917 hdr = (void *)skb->data;
918 info = IEEE80211_SKB_CB(skb);
921 hdr->frame_control |= morefrags;
922 next_len = skb->next->len;
924 * No multi-rate retries for fragmented frames, that
925 * would completely throw off the NAV at other STAs.
927 info->control.rates[1].idx = -1;
928 info->control.rates[2].idx = -1;
929 info->control.rates[3].idx = -1;
930 info->control.rates[4].idx = -1;
931 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
932 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
934 hdr->frame_control &= ~morefrags;
937 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
938 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
940 } while ((skb = skb->next));
945 static ieee80211_tx_result debug_noinline
946 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
948 struct sk_buff *skb = tx->skb;
953 tx->sta->tx_packets++;
955 tx->sta->tx_fragments++;
956 tx->sta->tx_bytes += skb->len;
957 } while ((skb = skb->next));
962 static ieee80211_tx_result debug_noinline
963 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
965 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
970 switch (tx->key->conf.cipher) {
971 case WLAN_CIPHER_SUITE_WEP40:
972 case WLAN_CIPHER_SUITE_WEP104:
973 return ieee80211_crypto_wep_encrypt(tx);
974 case WLAN_CIPHER_SUITE_TKIP:
975 return ieee80211_crypto_tkip_encrypt(tx);
976 case WLAN_CIPHER_SUITE_CCMP:
977 return ieee80211_crypto_ccmp_encrypt(tx);
978 case WLAN_CIPHER_SUITE_AES_CMAC:
979 return ieee80211_crypto_aes_cmac_encrypt(tx);
981 /* handle hw-only algorithm */
982 if (info->control.hw_key) {
983 ieee80211_tx_set_protected(tx);
993 static ieee80211_tx_result debug_noinline
994 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
996 struct sk_buff *skb = tx->skb;
997 struct ieee80211_hdr *hdr;
1002 hdr = (void *) skb->data;
1003 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1004 break; /* must not overwrite AID */
1005 next_len = skb->next ? skb->next->len : 0;
1006 group_addr = is_multicast_ether_addr(hdr->addr1);
1009 ieee80211_duration(tx, group_addr, next_len);
1010 } while ((skb = skb->next));
1015 /* actual transmit path */
1018 * deal with packet injection down monitor interface
1019 * with Radiotap Header -- only called for monitor mode interface
1021 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
1022 struct sk_buff *skb)
1025 * this is the moment to interpret and discard the radiotap header that
1026 * must be at the start of the packet injected in Monitor mode
1028 * Need to take some care with endian-ness since radiotap
1029 * args are little-endian
1032 struct ieee80211_radiotap_iterator iterator;
1033 struct ieee80211_radiotap_header *rthdr =
1034 (struct ieee80211_radiotap_header *) skb->data;
1035 struct ieee80211_supported_band *sband;
1037 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1038 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1041 sband = tx->local->hw.wiphy->bands[tx->channel->band];
1043 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1044 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1046 /* packet is fragmented in HW if we have a non-NULL driver callback */
1047 hw_frag = (tx->local->ops->set_frag_threshold != NULL);
1050 * for every radiotap entry that is present
1051 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1052 * entries present, or -EINVAL on error)
1056 ret = ieee80211_radiotap_iterator_next(&iterator);
1061 /* see if this argument is something we can use */
1062 switch (iterator.this_arg_index) {
1064 * You must take care when dereferencing iterator.this_arg
1065 * for multibyte types... the pointer is not aligned. Use
1066 * get_unaligned((type *)iterator.this_arg) to dereference
1067 * iterator.this_arg for type "type" safely on all arches.
1069 case IEEE80211_RADIOTAP_FLAGS:
1070 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1072 * this indicates that the skb we have been
1073 * handed has the 32-bit FCS CRC at the end...
1074 * we should react to that by snipping it off
1075 * because it will be recomputed and added
1078 if (skb->len < (iterator._max_length + FCS_LEN))
1081 skb_trim(skb, skb->len - FCS_LEN);
1083 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1084 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1085 if ((*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) &&
1087 tx->flags |= IEEE80211_TX_FRAGMENTED;
1091 * Please update the file
1092 * Documentation/networking/mac80211-injection.txt
1093 * when parsing new fields here.
1101 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1105 * remove the radiotap header
1106 * iterator->_max_length was sanity-checked against
1107 * skb->len by iterator init
1109 skb_pull(skb, iterator._max_length);
1114 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1115 struct sk_buff *skb,
1116 struct ieee80211_tx_info *info,
1117 struct tid_ampdu_tx *tid_tx,
1120 bool queued = false;
1122 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1123 info->flags |= IEEE80211_TX_CTL_AMPDU;
1124 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1126 * nothing -- this aggregation session is being started
1127 * but that might still fail with the driver
1130 spin_lock(&tx->sta->lock);
1132 * Need to re-check now, because we may get here
1134 * 1) in the window during which the setup is actually
1135 * already done, but not marked yet because not all
1136 * packets are spliced over to the driver pending
1137 * queue yet -- if this happened we acquire the lock
1138 * either before or after the splice happens, but
1139 * need to recheck which of these cases happened.
1141 * 2) during session teardown, if the OPERATIONAL bit
1142 * was cleared due to the teardown but the pointer
1143 * hasn't been assigned NULL yet (or we loaded it
1144 * before it was assigned) -- in this case it may
1145 * now be NULL which means we should just let the
1146 * packet pass through because splicing the frames
1147 * back is already done.
1149 tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];
1152 /* do nothing, let packet pass through */
1153 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1154 info->flags |= IEEE80211_TX_CTL_AMPDU;
1157 info->control.vif = &tx->sdata->vif;
1158 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1159 __skb_queue_tail(&tid_tx->pending, skb);
1161 spin_unlock(&tx->sta->lock);
1170 static ieee80211_tx_result
1171 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1172 struct ieee80211_tx_data *tx,
1173 struct sk_buff *skb)
1175 struct ieee80211_local *local = sdata->local;
1176 struct ieee80211_hdr *hdr;
1177 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1181 memset(tx, 0, sizeof(*tx));
1185 tx->channel = local->hw.conf.channel;
1187 * Set this flag (used below to indicate "automatic fragmentation"),
1188 * it will be cleared/left by radiotap as desired.
1189 * Only valid when fragmentation is done by the stack.
1191 if (!local->ops->set_frag_threshold)
1192 tx->flags |= IEEE80211_TX_FRAGMENTED;
1194 /* process and remove the injection radiotap header */
1195 if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1196 if (!__ieee80211_parse_tx_radiotap(tx, skb))
1200 * __ieee80211_parse_tx_radiotap has now removed
1201 * the radiotap header that was present and pre-filled
1202 * 'tx' with tx control information.
1204 info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1208 * If this flag is set to true anywhere, and we get here,
1209 * we are doing the needed processing, so remove the flag
1212 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1214 hdr = (struct ieee80211_hdr *) skb->data;
1216 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1217 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1218 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1220 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
1221 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1224 tx->sta = sta_info_get(sdata, hdr->addr1);
1226 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1227 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
1228 struct tid_ampdu_tx *tid_tx;
1230 qc = ieee80211_get_qos_ctl(hdr);
1231 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1233 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1237 queued = ieee80211_tx_prep_agg(tx, skb, info,
1240 if (unlikely(queued))
1245 if (is_multicast_ether_addr(hdr->addr1)) {
1246 tx->flags &= ~IEEE80211_TX_UNICAST;
1247 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1249 tx->flags |= IEEE80211_TX_UNICAST;
1250 if (unlikely(local->wifi_wme_noack_test))
1251 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1253 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1256 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1257 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1258 skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1259 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1260 tx->flags |= IEEE80211_TX_FRAGMENTED;
1262 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1266 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1267 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1268 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1270 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1271 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1272 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1273 tx->ethertype = (pos[0] << 8) | pos[1];
1275 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1280 static int __ieee80211_tx(struct ieee80211_local *local,
1281 struct sk_buff **skbp,
1282 struct sta_info *sta,
1285 struct sk_buff *skb = *skbp, *next;
1286 struct ieee80211_tx_info *info;
1287 struct ieee80211_sub_if_data *sdata;
1288 unsigned long flags;
1293 int q = skb_get_queue_mapping(skb);
1295 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1296 ret = IEEE80211_TX_OK;
1297 if (local->queue_stop_reasons[q] ||
1298 (!txpending && !skb_queue_empty(&local->pending[q])))
1299 ret = IEEE80211_TX_PENDING;
1300 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1301 if (ret != IEEE80211_TX_OK)
1304 info = IEEE80211_SKB_CB(skb);
1307 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1308 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1314 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
1316 sdata = vif_to_sdata(info->control.vif);
1318 switch (sdata->vif.type) {
1319 case NL80211_IFTYPE_MONITOR:
1320 info->control.vif = NULL;
1322 case NL80211_IFTYPE_AP_VLAN:
1323 info->control.vif = &container_of(sdata->bss,
1324 struct ieee80211_sub_if_data, u.ap)->vif;
1331 if (sta && sta->uploaded)
1332 info->control.sta = &sta->sta;
1334 info->control.sta = NULL;
1336 ret = drv_tx(local, skb);
1337 if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
1341 if (ret != NETDEV_TX_OK) {
1342 info->control.vif = &sdata->vif;
1343 return IEEE80211_TX_AGAIN;
1347 ieee80211_led_tx(local, 1);
1351 return IEEE80211_TX_OK;
1355 * Invoke TX handlers, return 0 on success and non-zero if the
1356 * frame was dropped or queued.
1358 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1360 struct sk_buff *skb = tx->skb;
1361 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1362 ieee80211_tx_result res = TX_DROP;
1364 #define CALL_TXH(txh) \
1367 if (res != TX_CONTINUE) \
1371 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1372 CALL_TXH(ieee80211_tx_h_check_assoc);
1373 CALL_TXH(ieee80211_tx_h_ps_buf);
1374 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1375 CALL_TXH(ieee80211_tx_h_select_key);
1376 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1377 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1379 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
1382 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1383 CALL_TXH(ieee80211_tx_h_sequence);
1384 CALL_TXH(ieee80211_tx_h_fragment);
1385 /* handlers after fragment must be aware of tx info fragmentation! */
1386 CALL_TXH(ieee80211_tx_h_stats);
1387 CALL_TXH(ieee80211_tx_h_encrypt);
1388 CALL_TXH(ieee80211_tx_h_calculate_duration);
1392 if (unlikely(res == TX_DROP)) {
1393 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1395 struct sk_buff *next;
1402 } else if (unlikely(res == TX_QUEUED)) {
1403 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1410 static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1411 struct sk_buff *skb, bool txpending)
1413 struct ieee80211_local *local = sdata->local;
1414 struct ieee80211_tx_data tx;
1415 ieee80211_tx_result res_prepare;
1416 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1417 struct sk_buff *next;
1418 unsigned long flags;
1422 queue = skb_get_queue_mapping(skb);
1424 if (unlikely(skb->len < 10)) {
1431 /* initialises tx */
1432 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1434 if (unlikely(res_prepare == TX_DROP)) {
1438 } else if (unlikely(res_prepare == TX_QUEUED)) {
1443 tx.channel = local->hw.conf.channel;
1444 info->band = tx.channel->band;
1446 if (invoke_tx_handlers(&tx))
1451 ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1453 case IEEE80211_TX_OK:
1455 case IEEE80211_TX_AGAIN:
1457 * Since there are no fragmented frames on A-MPDU
1458 * queues, there's no reason for a driver to reject
1459 * a frame there, warn and drop it.
1461 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
1464 case IEEE80211_TX_PENDING:
1467 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1469 if (local->queue_stop_reasons[queue] ||
1470 !skb_queue_empty(&local->pending[queue])) {
1472 * if queue is stopped, queue up frames for later
1473 * transmission from the tasklet
1478 if (unlikely(txpending))
1479 __skb_queue_head(&local->pending[queue],
1482 __skb_queue_tail(&local->pending[queue],
1484 } while ((skb = next));
1486 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1490 * otherwise retry, but this is a race condition or
1491 * a driver bug (which we warn about if it persists)
1493 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1497 if (WARN(retries > 10, "tx refused but queue active\n"))
1517 /* device xmit handlers */
1519 static int ieee80211_skb_resize(struct ieee80211_local *local,
1520 struct sk_buff *skb,
1521 int head_need, bool may_encrypt)
1526 * This could be optimised, devices that do full hardware
1527 * crypto (including TKIP MMIC) need no tailroom... But we
1528 * have no drivers for such devices currently.
1531 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1532 tail_need -= skb_tailroom(skb);
1533 tail_need = max_t(int, tail_need, 0);
1536 if (head_need || tail_need) {
1537 /* Sorry. Can't account for this any more */
1541 if (skb_header_cloned(skb))
1542 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1544 I802_DEBUG_INC(local->tx_expand_skb_head);
1546 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1547 wiphy_debug(local->hw.wiphy,
1548 "failed to reallocate TX buffer\n");
1552 /* update truesize too */
1553 skb->truesize += head_need + tail_need;
1558 static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1559 struct sk_buff *skb)
1561 struct ieee80211_local *local = sdata->local;
1562 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1563 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1564 struct ieee80211_sub_if_data *tmp_sdata;
1570 if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1574 info->flags |= IEEE80211_TX_CTL_INJECTED |
1575 IEEE80211_TX_INTFL_HAS_RADIOTAP;
1577 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1578 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1579 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1581 /* check the header is complete in the frame */
1582 if (likely(skb->len >= len_rthdr + hdrlen)) {
1584 * We process outgoing injected frames that have a
1585 * local address we handle as though they are our
1587 * This code here isn't entirely correct, the local
1588 * MAC address is not necessarily enough to find
1589 * the interface to use; for that proper VLAN/WDS
1590 * support we will need a different mechanism.
1593 list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1595 if (!ieee80211_sdata_running(tmp_sdata))
1597 if (tmp_sdata->vif.type != NL80211_IFTYPE_AP)
1599 if (compare_ether_addr(tmp_sdata->vif.addr,
1608 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1610 headroom = local->tx_headroom;
1612 headroom += IEEE80211_ENCRYPT_HEADROOM;
1613 headroom -= skb_headroom(skb);
1614 headroom = max_t(int, 0, headroom);
1616 if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1622 hdr = (struct ieee80211_hdr *) skb->data;
1623 info->control.vif = &sdata->vif;
1625 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1626 ieee80211_is_data(hdr->frame_control) &&
1627 !is_multicast_ether_addr(hdr->addr1))
1628 if (mesh_nexthop_lookup(skb, sdata)) {
1629 /* skb queued: don't free */
1634 ieee80211_set_qos_hdr(local, skb);
1635 ieee80211_tx(sdata, skb, false);
1639 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1640 struct net_device *dev)
1642 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1643 struct ieee80211_channel *chan = local->hw.conf.channel;
1644 struct ieee80211_radiotap_header *prthdr =
1645 (struct ieee80211_radiotap_header *)skb->data;
1646 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1650 * Frame injection is not allowed if beaconing is not allowed
1651 * or if we need radar detection. Beaconing is usually not allowed when
1652 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1653 * Passive scan is also used in world regulatory domains where
1654 * your country is not known and as such it should be treated as
1655 * NO TX unless the channel is explicitly allowed in which case
1656 * your current regulatory domain would not have the passive scan
1659 * Since AP mode uses monitor interfaces to inject/TX management
1660 * frames we can make AP mode the exception to this rule once it
1661 * supports radar detection as its implementation can deal with
1662 * radar detection by itself. We can do that later by adding a
1663 * monitor flag interfaces used for AP support.
1665 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1666 IEEE80211_CHAN_PASSIVE_SCAN)))
1669 /* check for not even having the fixed radiotap header part */
1670 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1671 goto fail; /* too short to be possibly valid */
1673 /* is it a header version we can trust to find length from? */
1674 if (unlikely(prthdr->it_version))
1675 goto fail; /* only version 0 is supported */
1677 /* then there must be a radiotap header with a length we can use */
1678 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1680 /* does the skb contain enough to deliver on the alleged length? */
1681 if (unlikely(skb->len < len_rthdr))
1682 goto fail; /* skb too short for claimed rt header extent */
1685 * fix up the pointers accounting for the radiotap
1686 * header still being in there. We are being given
1687 * a precooked IEEE80211 header so no need for
1690 skb_set_mac_header(skb, len_rthdr);
1692 * these are just fixed to the end of the rt area since we
1693 * don't have any better information and at this point, nobody cares
1695 skb_set_network_header(skb, len_rthdr);
1696 skb_set_transport_header(skb, len_rthdr);
1698 memset(info, 0, sizeof(*info));
1700 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1702 /* pass the radiotap header up to xmit */
1703 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1704 return NETDEV_TX_OK;
1708 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1712 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1713 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1714 * @skb: packet to be sent
1715 * @dev: incoming interface
1717 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1718 * not be freed, and caller is responsible for either retrying later or freeing
1721 * This function takes in an Ethernet header and encapsulates it with suitable
1722 * IEEE 802.11 header based on which interface the packet is coming in. The
1723 * encapsulated packet will then be passed to master interface, wlan#.11, for
1724 * transmission (through low-level driver).
1726 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1727 struct net_device *dev)
1729 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1730 struct ieee80211_local *local = sdata->local;
1731 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1732 int ret = NETDEV_TX_BUSY, head_need;
1733 u16 ethertype, hdrlen, meshhdrlen = 0;
1735 struct ieee80211_hdr hdr;
1736 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1737 const u8 *encaps_data;
1738 int encaps_len, skip_header_bytes;
1740 struct sta_info *sta = NULL;
1743 if (unlikely(skb->len < ETH_HLEN)) {
1748 nh_pos = skb_network_header(skb) - skb->data;
1749 h_pos = skb_transport_header(skb) - skb->data;
1751 /* convert Ethernet header to proper 802.11 header (based on
1752 * operation mode) */
1753 ethertype = (skb->data[12] << 8) | skb->data[13];
1754 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1756 switch (sdata->vif.type) {
1757 case NL80211_IFTYPE_AP_VLAN:
1759 sta = rcu_dereference(sdata->u.vlan.sta);
1761 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1763 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1764 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1765 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1766 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1768 sta_flags = get_sta_flags(sta);
1774 case NL80211_IFTYPE_AP:
1775 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1777 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1778 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1779 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1782 case NL80211_IFTYPE_WDS:
1783 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1785 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1786 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1787 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1788 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1791 #ifdef CONFIG_MAC80211_MESH
1792 case NL80211_IFTYPE_MESH_POINT:
1793 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1794 /* Do not send frames with mesh_ttl == 0 */
1795 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1800 if (compare_ether_addr(sdata->vif.addr,
1801 skb->data + ETH_ALEN) == 0) {
1802 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1803 skb->data, skb->data + ETH_ALEN);
1804 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1805 sdata, NULL, NULL, NULL);
1807 /* packet from other interface */
1808 struct mesh_path *mppath;
1809 int is_mesh_mcast = 1;
1813 if (is_multicast_ether_addr(skb->data))
1814 /* DA TA mSA AE:SA */
1815 mesh_da = skb->data;
1817 static const u8 bcast[ETH_ALEN] =
1818 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1820 mppath = mpp_path_lookup(skb->data, sdata);
1822 /* RA TA mDA mSA AE:DA SA */
1823 mesh_da = mppath->mpp;
1826 /* DA TA mSA AE:SA */
1830 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1831 mesh_da, sdata->vif.addr);
1835 ieee80211_new_mesh_header(&mesh_hdr,
1837 skb->data + ETH_ALEN,
1842 ieee80211_new_mesh_header(&mesh_hdr,
1846 skb->data + ETH_ALEN);
1851 case NL80211_IFTYPE_STATION:
1852 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1853 if (sdata->u.mgd.use_4addr &&
1854 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1855 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1857 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1858 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1859 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1862 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1864 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1865 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1869 case NL80211_IFTYPE_ADHOC:
1871 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1872 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1873 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1882 * There's no need to try to look up the destination
1883 * if it is a multicast address (which can only happen
1886 if (!is_multicast_ether_addr(hdr.addr1)) {
1888 sta = sta_info_get(sdata, hdr.addr1);
1890 sta_flags = get_sta_flags(sta);
1894 /* receiver and we are QoS enabled, use a QoS type frame */
1895 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1896 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1901 * Drop unicast frames to unauthorised stations unless they are
1902 * EAPOL frames from the local station.
1904 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1905 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1906 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1907 !(cpu_to_be16(ethertype) == sdata->control_port_protocol &&
1908 compare_ether_addr(sdata->vif.addr,
1909 skb->data + ETH_ALEN) == 0))) {
1910 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1911 if (net_ratelimit())
1912 printk(KERN_DEBUG "%s: dropped frame to %pM"
1913 " (unauthorized port)\n", dev->name,
1917 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1923 hdr.frame_control = fc;
1924 hdr.duration_id = 0;
1927 skip_header_bytes = ETH_HLEN;
1928 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1929 encaps_data = bridge_tunnel_header;
1930 encaps_len = sizeof(bridge_tunnel_header);
1931 skip_header_bytes -= 2;
1932 } else if (ethertype >= 0x600) {
1933 encaps_data = rfc1042_header;
1934 encaps_len = sizeof(rfc1042_header);
1935 skip_header_bytes -= 2;
1941 skb_pull(skb, skip_header_bytes);
1942 nh_pos -= skip_header_bytes;
1943 h_pos -= skip_header_bytes;
1945 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1948 * So we need to modify the skb header and hence need a copy of
1949 * that. The head_need variable above doesn't, so far, include
1950 * the needed header space that we don't need right away. If we
1951 * can, then we don't reallocate right now but only after the
1952 * frame arrives at the master device (if it does...)
1954 * If we cannot, however, then we will reallocate to include all
1955 * the ever needed space. Also, if we need to reallocate it anyway,
1956 * make it big enough for everything we may ever need.
1959 if (head_need > 0 || skb_cloned(skb)) {
1960 head_need += IEEE80211_ENCRYPT_HEADROOM;
1961 head_need += local->tx_headroom;
1962 head_need = max_t(int, 0, head_need);
1963 if (ieee80211_skb_resize(local, skb, head_need, true))
1968 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1969 nh_pos += encaps_len;
1970 h_pos += encaps_len;
1973 #ifdef CONFIG_MAC80211_MESH
1974 if (meshhdrlen > 0) {
1975 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
1976 nh_pos += meshhdrlen;
1977 h_pos += meshhdrlen;
1981 if (ieee80211_is_data_qos(fc)) {
1982 __le16 *qos_control;
1984 qos_control = (__le16*) skb_push(skb, 2);
1985 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
1987 * Maybe we could actually set some fields here, for now just
1988 * initialise to zero to indicate no special operation.
1992 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
1997 dev->stats.tx_packets++;
1998 dev->stats.tx_bytes += skb->len;
2000 /* Update skb pointers to various headers since this modified frame
2001 * is going to go through Linux networking code that may potentially
2002 * need things like pointer to IP header. */
2003 skb_set_mac_header(skb, 0);
2004 skb_set_network_header(skb, nh_pos);
2005 skb_set_transport_header(skb, h_pos);
2007 memset(info, 0, sizeof(*info));
2009 dev->trans_start = jiffies;
2010 ieee80211_xmit(sdata, skb);
2012 return NETDEV_TX_OK;
2015 if (ret == NETDEV_TX_OK)
2023 * ieee80211_clear_tx_pending may not be called in a context where
2024 * it is possible that it packets could come in again.
2026 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2030 for (i = 0; i < local->hw.queues; i++)
2031 skb_queue_purge(&local->pending[i]);
2034 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2035 struct sk_buff *skb)
2037 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2038 struct ieee80211_sub_if_data *sdata;
2039 struct sta_info *sta;
2040 struct ieee80211_hdr *hdr;
2044 sdata = vif_to_sdata(info->control.vif);
2046 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2047 ieee80211_tx(sdata, skb, true);
2049 hdr = (struct ieee80211_hdr *)skb->data;
2050 sta = sta_info_get(sdata, hdr->addr1);
2052 ret = __ieee80211_tx(local, &skb, sta, true);
2053 if (ret != IEEE80211_TX_OK)
2061 * Transmit all pending packets. Called from tasklet.
2063 void ieee80211_tx_pending(unsigned long data)
2065 struct ieee80211_local *local = (struct ieee80211_local *)data;
2066 struct ieee80211_sub_if_data *sdata;
2067 unsigned long flags;
2073 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2074 for (i = 0; i < local->hw.queues; i++) {
2076 * If queue is stopped by something other than due to pending
2077 * frames, or we have no pending frames, proceed to next queue.
2079 if (local->queue_stop_reasons[i] ||
2080 skb_queue_empty(&local->pending[i]))
2083 while (!skb_queue_empty(&local->pending[i])) {
2084 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2085 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2087 if (WARN_ON(!info->control.vif)) {
2092 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2095 txok = ieee80211_tx_pending_skb(local, skb);
2097 __skb_queue_head(&local->pending[i], skb);
2098 spin_lock_irqsave(&local->queue_stop_reason_lock,
2104 if (skb_queue_empty(&local->pending[i]))
2105 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2106 netif_wake_subqueue(sdata->dev, i);
2108 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2113 /* functions for drivers to get certain frames */
2115 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2116 struct sk_buff *skb,
2117 struct beacon_data *beacon)
2121 int i, have_bits = 0, n1, n2;
2123 /* Generate bitmap for TIM only if there are any STAs in power save
2125 if (atomic_read(&bss->num_sta_ps) > 0)
2126 /* in the hope that this is faster than
2127 * checking byte-for-byte */
2128 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2129 IEEE80211_MAX_AID+1);
2131 if (bss->dtim_count == 0)
2132 bss->dtim_count = beacon->dtim_period - 1;
2136 tim = pos = (u8 *) skb_put(skb, 6);
2137 *pos++ = WLAN_EID_TIM;
2139 *pos++ = bss->dtim_count;
2140 *pos++ = beacon->dtim_period;
2142 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2146 /* Find largest even number N1 so that bits numbered 1 through
2147 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2148 * (N2 + 1) x 8 through 2007 are 0. */
2150 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2157 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2164 /* Bitmap control */
2166 /* Part Virt Bitmap */
2167 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2169 tim[1] = n2 - n1 + 4;
2170 skb_put(skb, n2 - n1);
2172 *pos++ = aid0; /* Bitmap control */
2173 *pos++ = 0; /* Part Virt Bitmap */
2177 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2178 struct ieee80211_vif *vif,
2179 u16 *tim_offset, u16 *tim_length)
2181 struct ieee80211_local *local = hw_to_local(hw);
2182 struct sk_buff *skb = NULL;
2183 struct ieee80211_tx_info *info;
2184 struct ieee80211_sub_if_data *sdata = NULL;
2185 struct ieee80211_if_ap *ap = NULL;
2186 struct beacon_data *beacon;
2187 struct ieee80211_supported_band *sband;
2188 enum ieee80211_band band = local->hw.conf.channel->band;
2189 struct ieee80211_tx_rate_control txrc;
2191 sband = local->hw.wiphy->bands[band];
2195 sdata = vif_to_sdata(vif);
2202 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2204 beacon = rcu_dereference(ap->beacon);
2207 * headroom, head length,
2208 * tail length and maximum TIM length
2210 skb = dev_alloc_skb(local->tx_headroom +
2212 beacon->tail_len + 256);
2216 skb_reserve(skb, local->tx_headroom);
2217 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2221 * Not very nice, but we want to allow the driver to call
2222 * ieee80211_beacon_get() as a response to the set_tim()
2223 * callback. That, however, is already invoked under the
2224 * sta_lock to guarantee consistent and race-free update
2225 * of the tim bitmap in mac80211 and the driver.
2227 if (local->tim_in_locked_section) {
2228 ieee80211_beacon_add_tim(ap, skb, beacon);
2230 unsigned long flags;
2232 spin_lock_irqsave(&local->sta_lock, flags);
2233 ieee80211_beacon_add_tim(ap, skb, beacon);
2234 spin_unlock_irqrestore(&local->sta_lock, flags);
2238 *tim_offset = beacon->head_len;
2240 *tim_length = skb->len - beacon->head_len;
2243 memcpy(skb_put(skb, beacon->tail_len),
2244 beacon->tail, beacon->tail_len);
2247 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2248 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2249 struct ieee80211_hdr *hdr;
2250 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2255 skb = skb_copy(presp, GFP_ATOMIC);
2259 hdr = (struct ieee80211_hdr *) skb->data;
2260 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2261 IEEE80211_STYPE_BEACON);
2262 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2263 struct ieee80211_mgmt *mgmt;
2266 /* headroom, head length, tail length and maximum TIM length */
2267 skb = dev_alloc_skb(local->tx_headroom + 400);
2271 skb_reserve(skb, local->hw.extra_tx_headroom);
2272 mgmt = (struct ieee80211_mgmt *)
2273 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2274 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2275 mgmt->frame_control =
2276 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2277 memset(mgmt->da, 0xff, ETH_ALEN);
2278 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2279 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2280 mgmt->u.beacon.beacon_int =
2281 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2282 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
2284 pos = skb_put(skb, 2);
2285 *pos++ = WLAN_EID_SSID;
2288 mesh_mgmt_ies_add(skb, sdata);
2294 info = IEEE80211_SKB_CB(skb);
2296 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2297 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2300 memset(&txrc, 0, sizeof(txrc));
2303 txrc.bss_conf = &sdata->vif.bss_conf;
2305 txrc.reported_rate.idx = -1;
2306 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2307 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2308 txrc.max_rate_idx = -1;
2310 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2312 rate_control_get_rate(sdata, NULL, &txrc);
2314 info->control.vif = vif;
2316 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2317 IEEE80211_TX_CTL_ASSIGN_SEQ |
2318 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2323 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2325 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2326 struct ieee80211_vif *vif)
2328 struct ieee80211_sub_if_data *sdata;
2329 struct ieee80211_if_managed *ifmgd;
2330 struct ieee80211_pspoll *pspoll;
2331 struct ieee80211_local *local;
2332 struct sk_buff *skb;
2334 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2337 sdata = vif_to_sdata(vif);
2338 ifmgd = &sdata->u.mgd;
2339 local = sdata->local;
2341 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2343 printk(KERN_DEBUG "%s: failed to allocate buffer for "
2344 "pspoll template\n", sdata->name);
2347 skb_reserve(skb, local->hw.extra_tx_headroom);
2349 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2350 memset(pspoll, 0, sizeof(*pspoll));
2351 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2352 IEEE80211_STYPE_PSPOLL);
2353 pspoll->aid = cpu_to_le16(ifmgd->aid);
2355 /* aid in PS-Poll has its two MSBs each set to 1 */
2356 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2358 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2359 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2363 EXPORT_SYMBOL(ieee80211_pspoll_get);
2365 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2366 struct ieee80211_vif *vif)
2368 struct ieee80211_hdr_3addr *nullfunc;
2369 struct ieee80211_sub_if_data *sdata;
2370 struct ieee80211_if_managed *ifmgd;
2371 struct ieee80211_local *local;
2372 struct sk_buff *skb;
2374 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2377 sdata = vif_to_sdata(vif);
2378 ifmgd = &sdata->u.mgd;
2379 local = sdata->local;
2381 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2383 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2384 "template\n", sdata->name);
2387 skb_reserve(skb, local->hw.extra_tx_headroom);
2389 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2391 memset(nullfunc, 0, sizeof(*nullfunc));
2392 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2393 IEEE80211_STYPE_NULLFUNC |
2394 IEEE80211_FCTL_TODS);
2395 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2396 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2397 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2401 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2403 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2404 struct ieee80211_vif *vif,
2405 const u8 *ssid, size_t ssid_len,
2406 const u8 *ie, size_t ie_len)
2408 struct ieee80211_sub_if_data *sdata;
2409 struct ieee80211_local *local;
2410 struct ieee80211_hdr_3addr *hdr;
2411 struct sk_buff *skb;
2415 sdata = vif_to_sdata(vif);
2416 local = sdata->local;
2417 ie_ssid_len = 2 + ssid_len;
2419 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2420 ie_ssid_len + ie_len);
2422 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
2423 "request template\n", sdata->name);
2427 skb_reserve(skb, local->hw.extra_tx_headroom);
2429 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2430 memset(hdr, 0, sizeof(*hdr));
2431 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2432 IEEE80211_STYPE_PROBE_REQ);
2433 memset(hdr->addr1, 0xff, ETH_ALEN);
2434 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2435 memset(hdr->addr3, 0xff, ETH_ALEN);
2437 pos = skb_put(skb, ie_ssid_len);
2438 *pos++ = WLAN_EID_SSID;
2441 memcpy(pos, ssid, ssid_len);
2445 pos = skb_put(skb, ie_len);
2446 memcpy(pos, ie, ie_len);
2451 EXPORT_SYMBOL(ieee80211_probereq_get);
2453 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2454 const void *frame, size_t frame_len,
2455 const struct ieee80211_tx_info *frame_txctl,
2456 struct ieee80211_rts *rts)
2458 const struct ieee80211_hdr *hdr = frame;
2460 rts->frame_control =
2461 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2462 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2464 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2465 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2467 EXPORT_SYMBOL(ieee80211_rts_get);
2469 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2470 const void *frame, size_t frame_len,
2471 const struct ieee80211_tx_info *frame_txctl,
2472 struct ieee80211_cts *cts)
2474 const struct ieee80211_hdr *hdr = frame;
2476 cts->frame_control =
2477 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2478 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2479 frame_len, frame_txctl);
2480 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2482 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2485 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2486 struct ieee80211_vif *vif)
2488 struct ieee80211_local *local = hw_to_local(hw);
2489 struct sk_buff *skb = NULL;
2490 struct sta_info *sta;
2491 struct ieee80211_tx_data tx;
2492 struct ieee80211_sub_if_data *sdata;
2493 struct ieee80211_if_ap *bss = NULL;
2494 struct beacon_data *beacon;
2495 struct ieee80211_tx_info *info;
2497 sdata = vif_to_sdata(vif);
2501 beacon = rcu_dereference(bss->beacon);
2503 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2506 if (bss->dtim_count != 0)
2507 goto out; /* send buffered bc/mc only after DTIM beacon */
2510 skb = skb_dequeue(&bss->ps_bc_buf);
2513 local->total_ps_buffered--;
2515 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2516 struct ieee80211_hdr *hdr =
2517 (struct ieee80211_hdr *) skb->data;
2518 /* more buffered multicast/broadcast frames ==> set
2519 * MoreData flag in IEEE 802.11 header to inform PS
2521 hdr->frame_control |=
2522 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2525 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2527 dev_kfree_skb_any(skb);
2530 info = IEEE80211_SKB_CB(skb);
2533 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2534 tx.channel = local->hw.conf.channel;
2535 info->band = tx.channel->band;
2537 if (invoke_tx_handlers(&tx))
2544 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2546 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
2548 skb_set_mac_header(skb, 0);
2549 skb_set_network_header(skb, 0);
2550 skb_set_transport_header(skb, 0);
2552 /* send all internal mgmt frames on VO */
2553 skb_set_queue_mapping(skb, 0);
2556 * The other path calling ieee80211_xmit is from the tasklet,
2557 * and while we can handle concurrent transmissions locking
2558 * requirements are that we do not come into tx with bhs on.
2561 ieee80211_xmit(sdata, skb);