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"
38 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
41 int rate, mrate, erp, dur, i;
42 struct ieee80211_rate *txrate;
43 struct ieee80211_local *local = tx->local;
44 struct ieee80211_supported_band *sband;
45 struct ieee80211_hdr *hdr;
46 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
48 /* assume HW handles this */
49 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
53 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
56 sband = local->hw.wiphy->bands[tx->channel->band];
57 txrate = &sband->bitrates[info->control.rates[0].idx];
59 erp = txrate->flags & IEEE80211_RATE_ERP_G;
62 * data and mgmt (except PS Poll):
64 * - during contention period:
65 * if addr1 is group address: 0
66 * if more fragments = 0 and addr1 is individual address: time to
67 * transmit one ACK plus SIFS
68 * if more fragments = 1 and addr1 is individual address: time to
69 * transmit next fragment plus 2 x ACK plus 3 x SIFS
72 * - control response frame (CTS or ACK) shall be transmitted using the
73 * same rate as the immediately previous frame in the frame exchange
74 * sequence, if this rate belongs to the PHY mandatory rates, or else
75 * at the highest possible rate belonging to the PHY rates in the
78 hdr = (struct ieee80211_hdr *)tx->skb->data;
79 if (ieee80211_is_ctl(hdr->frame_control)) {
80 /* TODO: These control frames are not currently sent by
81 * mac80211, but should they be implemented, this function
82 * needs to be updated to support duration field calculation.
84 * RTS: time needed to transmit pending data/mgmt frame plus
85 * one CTS frame plus one ACK frame plus 3 x SIFS
86 * CTS: duration of immediately previous RTS minus time
87 * required to transmit CTS and its SIFS
88 * ACK: 0 if immediately previous directed data/mgmt had
89 * more=0, with more=1 duration in ACK frame is duration
90 * from previous frame minus time needed to transmit ACK
92 * PS Poll: BIT(15) | BIT(14) | aid
98 if (0 /* FIX: data/mgmt during CFP */)
99 return cpu_to_le16(32768);
101 if (group_addr) /* Group address as the destination - no ACK */
104 /* Individual destination address:
105 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
106 * CTS and ACK frames shall be transmitted using the highest rate in
107 * basic rate set that is less than or equal to the rate of the
108 * immediately previous frame and that is using the same modulation
109 * (CCK or OFDM). If no basic rate set matches with these requirements,
110 * the highest mandatory rate of the PHY that is less than or equal to
111 * the rate of the previous frame is used.
112 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
115 /* use lowest available if everything fails */
116 mrate = sband->bitrates[0].bitrate;
117 for (i = 0; i < sband->n_bitrates; i++) {
118 struct ieee80211_rate *r = &sband->bitrates[i];
120 if (r->bitrate > txrate->bitrate)
123 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
126 switch (sband->band) {
127 case IEEE80211_BAND_2GHZ: {
129 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
130 flag = IEEE80211_RATE_MANDATORY_G;
132 flag = IEEE80211_RATE_MANDATORY_B;
137 case IEEE80211_BAND_5GHZ:
138 if (r->flags & IEEE80211_RATE_MANDATORY_A)
141 case IEEE80211_NUM_BANDS:
147 /* No matching basic rate found; use highest suitable mandatory
152 /* Time needed to transmit ACK
153 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
154 * to closest integer */
156 dur = ieee80211_frame_duration(local, 10, rate, erp,
157 tx->sdata->vif.bss_conf.use_short_preamble);
160 /* Frame is fragmented: duration increases with time needed to
161 * transmit next fragment plus ACK and 2 x SIFS. */
162 dur *= 2; /* ACK + SIFS */
164 dur += ieee80211_frame_duration(local, next_frag_len,
165 txrate->bitrate, erp,
166 tx->sdata->vif.bss_conf.use_short_preamble);
169 return cpu_to_le16(dur);
172 static inline int is_ieee80211_device(struct ieee80211_local *local,
173 struct net_device *dev)
175 return local == wdev_priv(dev->ieee80211_ptr);
179 static ieee80211_tx_result debug_noinline
180 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
182 struct ieee80211_local *local = tx->local;
183 struct ieee80211_if_managed *ifmgd;
185 /* driver doesn't support power save */
186 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
189 /* hardware does dynamic power save */
190 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
193 /* dynamic power save disabled */
194 if (local->hw.conf.dynamic_ps_timeout <= 0)
197 /* we are scanning, don't enable power save */
201 if (!local->ps_sdata)
204 /* No point if we're going to suspend */
205 if (local->quiescing)
208 /* dynamic ps is supported only in managed mode */
209 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
212 ifmgd = &tx->sdata->u.mgd;
215 * Don't wakeup from power save if u-apsd is enabled, voip ac has
216 * u-apsd enabled and the frame is in voip class. This effectively
217 * means that even if all access categories have u-apsd enabled, in
218 * practise u-apsd is only used with the voip ac. This is a
219 * workaround for the case when received voip class packets do not
220 * have correct qos tag for some reason, due the network or the
223 * Note: local->uapsd_queues access is racy here. If the value is
224 * changed via debugfs, user needs to reassociate manually to have
225 * everything in sync.
227 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
228 && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
229 && skb_get_queue_mapping(tx->skb) == 0)
232 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
233 ieee80211_stop_queues_by_reason(&local->hw,
234 IEEE80211_QUEUE_STOP_REASON_PS);
235 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
236 ieee80211_queue_work(&local->hw,
237 &local->dynamic_ps_disable_work);
240 /* Don't restart the timer if we're not disassociated */
241 if (!ifmgd->associated)
244 mod_timer(&local->dynamic_ps_timer, jiffies +
245 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
250 static ieee80211_tx_result debug_noinline
251 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
254 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
255 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
258 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
261 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
262 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
263 !ieee80211_is_probe_req(hdr->frame_control) &&
264 !ieee80211_is_nullfunc(hdr->frame_control))
266 * When software scanning only nullfunc frames (to notify
267 * the sleep state to the AP) and probe requests (for the
268 * active scan) are allowed, all other frames should not be
269 * sent and we should not get here, but if we do
270 * nonetheless, drop them to avoid sending them
271 * off-channel. See the link below and
272 * ieee80211_start_scan() for more.
274 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
278 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
281 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
284 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
288 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
290 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
291 if (unlikely(!assoc &&
292 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
293 ieee80211_is_data(hdr->frame_control))) {
294 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
295 printk(KERN_DEBUG "%s: dropped data frame to not "
296 "associated station %pM\n",
297 tx->sdata->name, hdr->addr1);
298 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
299 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
303 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
304 tx->local->num_sta == 0 &&
305 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
307 * No associated STAs - no need to send multicast
318 /* This function is called whenever the AP is about to exceed the maximum limit
319 * of buffered frames for power saving STAs. This situation should not really
320 * happen often during normal operation, so dropping the oldest buffered packet
321 * from each queue should be OK to make some room for new frames. */
322 static void purge_old_ps_buffers(struct ieee80211_local *local)
324 int total = 0, purged = 0;
326 struct ieee80211_sub_if_data *sdata;
327 struct sta_info *sta;
330 * virtual interfaces are protected by RCU
334 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
335 struct ieee80211_if_ap *ap;
336 if (sdata->vif.type != NL80211_IFTYPE_AP)
339 skb = skb_dequeue(&ap->ps_bc_buf);
344 total += skb_queue_len(&ap->ps_bc_buf);
348 * Drop one frame from each station from the lowest-priority
349 * AC that has frames at all.
351 list_for_each_entry_rcu(sta, &local->sta_list, list) {
354 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
355 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
356 total += skb_queue_len(&sta->ps_tx_buf[ac]);
367 local->total_ps_buffered = total;
368 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
369 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
374 static ieee80211_tx_result
375 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
377 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
378 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
381 * broadcast/multicast frame
383 * If any of the associated stations is in power save mode,
384 * the frame is buffered to be sent after DTIM beacon frame.
385 * This is done either by the hardware or us.
388 /* powersaving STAs only in AP/VLAN mode */
392 /* no buffering for ordered frames */
393 if (ieee80211_has_order(hdr->frame_control))
396 /* no stations in PS mode */
397 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
400 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
402 /* device releases frame after DTIM beacon */
403 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
406 /* buffered in mac80211 */
407 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
408 purge_old_ps_buffers(tx->local);
410 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
411 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
413 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
416 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
418 tx->local->total_ps_buffered++;
420 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
425 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
428 if (!ieee80211_is_mgmt(fc))
431 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
434 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
441 static ieee80211_tx_result
442 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
444 struct sta_info *sta = tx->sta;
445 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
446 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
447 struct ieee80211_local *local = tx->local;
450 ieee80211_is_probe_resp(hdr->frame_control) ||
451 ieee80211_is_auth(hdr->frame_control) ||
452 ieee80211_is_assoc_resp(hdr->frame_control) ||
453 ieee80211_is_reassoc_resp(hdr->frame_control)))
456 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
457 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
458 !(info->flags & IEEE80211_TX_CTL_POLL_RESPONSE))) {
459 int ac = skb_get_queue_mapping(tx->skb);
461 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
462 printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n",
463 sta->sta.addr, sta->sta.aid, ac);
464 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
465 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
466 purge_old_ps_buffers(tx->local);
467 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
468 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
469 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
471 printk(KERN_DEBUG "%s: STA %pM TX buffer for "
472 "AC %d full - dropping oldest frame\n",
473 tx->sdata->name, sta->sta.addr, ac);
477 tx->local->total_ps_buffered++;
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[ac], tx->skb);
484 if (!timer_pending(&local->sta_cleanup))
485 mod_timer(&local->sta_cleanup,
486 round_jiffies(jiffies +
487 STA_INFO_CLEANUP_INTERVAL));
490 * We queued up some frames, so the TIM bit might
491 * need to be set, recalculate it.
493 sta_info_recalc_tim(sta);
497 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
498 else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
500 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
501 tx->sdata->name, sta->sta.addr);
503 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
508 static ieee80211_tx_result debug_noinline
509 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
511 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
514 if (tx->flags & IEEE80211_TX_UNICAST)
515 return ieee80211_tx_h_unicast_ps_buf(tx);
517 return ieee80211_tx_h_multicast_ps_buf(tx);
520 static ieee80211_tx_result debug_noinline
521 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
523 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
525 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
526 tx->sdata->control_port_no_encrypt))
527 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
532 static ieee80211_tx_result debug_noinline
533 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
535 struct ieee80211_key *key = NULL;
536 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
537 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
539 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
541 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
543 else if (ieee80211_is_mgmt(hdr->frame_control) &&
544 is_multicast_ether_addr(hdr->addr1) &&
545 ieee80211_is_robust_mgmt_frame(hdr) &&
546 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
548 else if (is_multicast_ether_addr(hdr->addr1) &&
549 (key = rcu_dereference(tx->sdata->default_multicast_key)))
551 else if (!is_multicast_ether_addr(hdr->addr1) &&
552 (key = rcu_dereference(tx->sdata->default_unicast_key)))
554 else if (tx->sdata->drop_unencrypted &&
555 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
556 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
557 (!ieee80211_is_robust_mgmt_frame(hdr) ||
558 (ieee80211_is_action(hdr->frame_control) &&
559 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) {
560 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
566 bool skip_hw = false;
568 tx->key->tx_rx_count++;
569 /* TODO: add threshold stuff again */
571 switch (tx->key->conf.cipher) {
572 case WLAN_CIPHER_SUITE_WEP40:
573 case WLAN_CIPHER_SUITE_WEP104:
574 if (ieee80211_is_auth(hdr->frame_control))
576 case WLAN_CIPHER_SUITE_TKIP:
577 if (!ieee80211_is_data_present(hdr->frame_control))
580 case WLAN_CIPHER_SUITE_CCMP:
581 if (!ieee80211_is_data_present(hdr->frame_control) &&
582 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
586 skip_hw = (tx->key->conf.flags &
587 IEEE80211_KEY_FLAG_SW_MGMT) &&
588 ieee80211_is_mgmt(hdr->frame_control);
590 case WLAN_CIPHER_SUITE_AES_CMAC:
591 if (!ieee80211_is_mgmt(hdr->frame_control))
596 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
599 if (!skip_hw && tx->key &&
600 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
601 info->control.hw_key = &tx->key->conf;
607 static ieee80211_tx_result debug_noinline
608 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
610 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
611 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
612 struct ieee80211_supported_band *sband;
613 struct ieee80211_rate *rate;
616 bool inval = false, rts = false, short_preamble = false;
617 struct ieee80211_tx_rate_control txrc;
620 memset(&txrc, 0, sizeof(txrc));
622 sband = tx->local->hw.wiphy->bands[tx->channel->band];
624 len = min_t(u32, tx->skb->len + FCS_LEN,
625 tx->local->hw.wiphy->frag_threshold);
627 /* set up the tx rate control struct we give the RC algo */
628 txrc.hw = local_to_hw(tx->local);
630 txrc.bss_conf = &tx->sdata->vif.bss_conf;
632 txrc.reported_rate.idx = -1;
633 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
634 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
635 txrc.max_rate_idx = -1;
637 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
638 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
639 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
641 /* set up RTS protection if desired */
642 if (len > tx->local->hw.wiphy->rts_threshold) {
643 txrc.rts = rts = true;
647 * Use short preamble if the BSS can handle it, but not for
648 * management frames unless we know the receiver can handle
649 * that -- the management frame might be to a station that
650 * just wants a probe response.
652 if (tx->sdata->vif.bss_conf.use_short_preamble &&
653 (ieee80211_is_data(hdr->frame_control) ||
654 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
655 txrc.short_preamble = short_preamble = true;
658 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
661 * Lets not bother rate control if we're associated and cannot
662 * talk to the sta. This should not happen.
664 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
665 !rate_usable_index_exists(sband, &tx->sta->sta),
666 "%s: Dropped data frame as no usable bitrate found while "
667 "scanning and associated. Target station: "
668 "%pM on %d GHz band\n",
669 tx->sdata->name, hdr->addr1,
670 tx->channel->band ? 5 : 2))
674 * If we're associated with the sta at this point we know we can at
675 * least send the frame at the lowest bit rate.
677 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
679 if (unlikely(info->control.rates[0].idx < 0))
682 if (txrc.reported_rate.idx < 0) {
683 txrc.reported_rate = info->control.rates[0];
684 if (tx->sta && ieee80211_is_data(hdr->frame_control))
685 tx->sta->last_tx_rate = txrc.reported_rate;
687 tx->sta->last_tx_rate = txrc.reported_rate;
689 if (unlikely(!info->control.rates[0].count))
690 info->control.rates[0].count = 1;
692 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
693 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
694 info->control.rates[0].count = 1;
696 if (is_multicast_ether_addr(hdr->addr1)) {
698 * XXX: verify the rate is in the basic rateset
704 * set up the RTS/CTS rate as the fastest basic rate
705 * that is not faster than the data rate
707 * XXX: Should this check all retry rates?
709 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
712 rate = &sband->bitrates[info->control.rates[0].idx];
714 for (i = 0; i < sband->n_bitrates; i++) {
715 /* must be a basic rate */
716 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
718 /* must not be faster than the data rate */
719 if (sband->bitrates[i].bitrate > rate->bitrate)
722 if (sband->bitrates[baserate].bitrate <
723 sband->bitrates[i].bitrate)
727 info->control.rts_cts_rate_idx = baserate;
730 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
732 * make sure there's no valid rate following
733 * an invalid one, just in case drivers don't
734 * take the API seriously to stop at -1.
737 info->control.rates[i].idx = -1;
740 if (info->control.rates[i].idx < 0) {
746 * For now assume MCS is already set up correctly, this
749 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
750 WARN_ON(info->control.rates[i].idx > 76);
754 /* set up RTS protection if desired */
756 info->control.rates[i].flags |=
757 IEEE80211_TX_RC_USE_RTS_CTS;
760 if (WARN_ON_ONCE(info->control.rates[i].idx >=
761 sband->n_bitrates)) {
762 info->control.rates[i].idx = -1;
766 rate = &sband->bitrates[info->control.rates[i].idx];
768 /* set up short preamble */
769 if (short_preamble &&
770 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
771 info->control.rates[i].flags |=
772 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
774 /* set up G protection */
775 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
776 rate->flags & IEEE80211_RATE_ERP_G)
777 info->control.rates[i].flags |=
778 IEEE80211_TX_RC_USE_CTS_PROTECT;
784 static ieee80211_tx_result debug_noinline
785 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
787 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
788 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
794 * Packet injection may want to control the sequence
795 * number, if we have no matching interface then we
796 * neither assign one ourselves nor ask the driver to.
798 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
801 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
804 if (ieee80211_hdrlen(hdr->frame_control) < 24)
807 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
811 * Anything but QoS data that has a sequence number field
812 * (is long enough) gets a sequence number from the global
815 if (!ieee80211_is_data_qos(hdr->frame_control)) {
816 /* driver should assign sequence number */
817 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
818 /* for pure STA mode without beacons, we can do it */
819 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
820 tx->sdata->sequence_number += 0x10;
825 * This should be true for injected/management frames only, for
826 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
827 * above since they are not QoS-data frames.
832 /* include per-STA, per-TID sequence counter */
834 qc = ieee80211_get_qos_ctl(hdr);
835 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
836 seq = &tx->sta->tid_seq[tid];
838 hdr->seq_ctrl = cpu_to_le16(*seq);
840 /* Increase the sequence number. */
841 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
846 static int ieee80211_fragment(struct ieee80211_local *local,
847 struct sk_buff *skb, int hdrlen,
850 struct sk_buff *tail = skb, *tmp;
851 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
852 int pos = hdrlen + per_fragm;
853 int rem = skb->len - hdrlen - per_fragm;
855 if (WARN_ON(rem < 0))
859 int fraglen = per_fragm;
864 tmp = dev_alloc_skb(local->tx_headroom +
866 IEEE80211_ENCRYPT_HEADROOM +
867 IEEE80211_ENCRYPT_TAILROOM);
872 skb_reserve(tmp, local->tx_headroom +
873 IEEE80211_ENCRYPT_HEADROOM);
874 /* copy control information */
875 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
876 skb_copy_queue_mapping(tmp, skb);
877 tmp->priority = skb->priority;
880 /* copy header and data */
881 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
882 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
887 skb->len = hdrlen + per_fragm;
891 static ieee80211_tx_result debug_noinline
892 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
894 struct sk_buff *skb = tx->skb;
895 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
896 struct ieee80211_hdr *hdr = (void *)skb->data;
897 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
901 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
905 * Warn when submitting a fragmented A-MPDU frame and drop it.
906 * This scenario is handled in ieee80211_tx_prepare but extra
907 * caution taken here as fragmented ampdu may cause Tx stop.
909 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
912 hdrlen = ieee80211_hdrlen(hdr->frame_control);
914 /* internal error, why is TX_FRAGMENTED set? */
915 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
919 * Now fragment the frame. This will allocate all the fragments and
920 * chain them (using skb as the first fragment) to skb->next.
921 * During transmission, we will remove the successfully transmitted
922 * fragments from this list. When the low-level driver rejects one
923 * of the fragments then we will simply pretend to accept the skb
924 * but store it away as pending.
926 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
929 /* update duration/seq/flags of fragments */
933 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
935 hdr = (void *)skb->data;
936 info = IEEE80211_SKB_CB(skb);
939 hdr->frame_control |= morefrags;
940 next_len = skb->next->len;
942 * No multi-rate retries for fragmented frames, that
943 * would completely throw off the NAV at other STAs.
945 info->control.rates[1].idx = -1;
946 info->control.rates[2].idx = -1;
947 info->control.rates[3].idx = -1;
948 info->control.rates[4].idx = -1;
949 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
950 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
952 hdr->frame_control &= ~morefrags;
955 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
956 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
958 } while ((skb = skb->next));
963 static ieee80211_tx_result debug_noinline
964 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
966 struct sk_buff *skb = tx->skb;
971 tx->sta->tx_packets++;
973 tx->sta->tx_fragments++;
974 tx->sta->tx_bytes += skb->len;
975 } while ((skb = skb->next));
980 static ieee80211_tx_result debug_noinline
981 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
983 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
988 switch (tx->key->conf.cipher) {
989 case WLAN_CIPHER_SUITE_WEP40:
990 case WLAN_CIPHER_SUITE_WEP104:
991 return ieee80211_crypto_wep_encrypt(tx);
992 case WLAN_CIPHER_SUITE_TKIP:
993 return ieee80211_crypto_tkip_encrypt(tx);
994 case WLAN_CIPHER_SUITE_CCMP:
995 return ieee80211_crypto_ccmp_encrypt(tx);
996 case WLAN_CIPHER_SUITE_AES_CMAC:
997 return ieee80211_crypto_aes_cmac_encrypt(tx);
999 /* handle hw-only algorithm */
1000 if (info->control.hw_key) {
1001 ieee80211_tx_set_protected(tx);
1011 static ieee80211_tx_result debug_noinline
1012 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1014 struct sk_buff *skb = tx->skb;
1015 struct ieee80211_hdr *hdr;
1020 hdr = (void *) skb->data;
1021 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1022 break; /* must not overwrite AID */
1023 next_len = skb->next ? skb->next->len : 0;
1024 group_addr = is_multicast_ether_addr(hdr->addr1);
1027 ieee80211_duration(tx, group_addr, next_len);
1028 } while ((skb = skb->next));
1033 /* actual transmit path */
1036 * deal with packet injection down monitor interface
1037 * with Radiotap Header -- only called for monitor mode interface
1039 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
1040 struct sk_buff *skb)
1043 * this is the moment to interpret and discard the radiotap header that
1044 * must be at the start of the packet injected in Monitor mode
1046 * Need to take some care with endian-ness since radiotap
1047 * args are little-endian
1050 struct ieee80211_radiotap_iterator iterator;
1051 struct ieee80211_radiotap_header *rthdr =
1052 (struct ieee80211_radiotap_header *) skb->data;
1054 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1055 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1059 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1060 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1062 /* packet is fragmented in HW if we have a non-NULL driver callback */
1063 hw_frag = (tx->local->ops->set_frag_threshold != NULL);
1066 * for every radiotap entry that is present
1067 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1068 * entries present, or -EINVAL on error)
1072 ret = ieee80211_radiotap_iterator_next(&iterator);
1077 /* see if this argument is something we can use */
1078 switch (iterator.this_arg_index) {
1080 * You must take care when dereferencing iterator.this_arg
1081 * for multibyte types... the pointer is not aligned. Use
1082 * get_unaligned((type *)iterator.this_arg) to dereference
1083 * iterator.this_arg for type "type" safely on all arches.
1085 case IEEE80211_RADIOTAP_FLAGS:
1086 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1088 * this indicates that the skb we have been
1089 * handed has the 32-bit FCS CRC at the end...
1090 * we should react to that by snipping it off
1091 * because it will be recomputed and added
1094 if (skb->len < (iterator._max_length + FCS_LEN))
1097 skb_trim(skb, skb->len - FCS_LEN);
1099 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1100 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1101 if ((*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) &&
1103 tx->flags |= IEEE80211_TX_FRAGMENTED;
1106 case IEEE80211_RADIOTAP_TX_FLAGS:
1107 txflags = le16_to_cpu(get_unaligned((__le16*)
1108 iterator.this_arg));
1109 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1110 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1114 * Please update the file
1115 * Documentation/networking/mac80211-injection.txt
1116 * when parsing new fields here.
1124 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1128 * remove the radiotap header
1129 * iterator->_max_length was sanity-checked against
1130 * skb->len by iterator init
1132 skb_pull(skb, iterator._max_length);
1137 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1138 struct sk_buff *skb,
1139 struct ieee80211_tx_info *info,
1140 struct tid_ampdu_tx *tid_tx,
1143 bool queued = false;
1145 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1146 info->flags |= IEEE80211_TX_CTL_AMPDU;
1147 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1149 * nothing -- this aggregation session is being started
1150 * but that might still fail with the driver
1153 spin_lock(&tx->sta->lock);
1155 * Need to re-check now, because we may get here
1157 * 1) in the window during which the setup is actually
1158 * already done, but not marked yet because not all
1159 * packets are spliced over to the driver pending
1160 * queue yet -- if this happened we acquire the lock
1161 * either before or after the splice happens, but
1162 * need to recheck which of these cases happened.
1164 * 2) during session teardown, if the OPERATIONAL bit
1165 * was cleared due to the teardown but the pointer
1166 * hasn't been assigned NULL yet (or we loaded it
1167 * before it was assigned) -- in this case it may
1168 * now be NULL which means we should just let the
1169 * packet pass through because splicing the frames
1170 * back is already done.
1172 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1175 /* do nothing, let packet pass through */
1176 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1177 info->flags |= IEEE80211_TX_CTL_AMPDU;
1180 info->control.vif = &tx->sdata->vif;
1181 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1182 __skb_queue_tail(&tid_tx->pending, skb);
1184 spin_unlock(&tx->sta->lock);
1193 static ieee80211_tx_result
1194 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1195 struct ieee80211_tx_data *tx,
1196 struct sk_buff *skb)
1198 struct ieee80211_local *local = sdata->local;
1199 struct ieee80211_hdr *hdr;
1200 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1204 memset(tx, 0, sizeof(*tx));
1208 tx->channel = local->hw.conf.channel;
1210 * Set this flag (used below to indicate "automatic fragmentation"),
1211 * it will be cleared/left by radiotap as desired.
1212 * Only valid when fragmentation is done by the stack.
1214 if (!local->ops->set_frag_threshold)
1215 tx->flags |= IEEE80211_TX_FRAGMENTED;
1217 /* process and remove the injection radiotap header */
1218 if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1219 if (!__ieee80211_parse_tx_radiotap(tx, skb))
1223 * __ieee80211_parse_tx_radiotap has now removed
1224 * the radiotap header that was present and pre-filled
1225 * 'tx' with tx control information.
1227 info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1231 * If this flag is set to true anywhere, and we get here,
1232 * we are doing the needed processing, so remove the flag
1235 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1237 hdr = (struct ieee80211_hdr *) skb->data;
1239 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1240 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1241 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1243 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
1244 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1247 tx->sta = sta_info_get(sdata, hdr->addr1);
1249 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1250 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1251 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1252 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1253 struct tid_ampdu_tx *tid_tx;
1255 qc = ieee80211_get_qos_ctl(hdr);
1256 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1258 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1262 queued = ieee80211_tx_prep_agg(tx, skb, info,
1265 if (unlikely(queued))
1270 if (is_multicast_ether_addr(hdr->addr1)) {
1271 tx->flags &= ~IEEE80211_TX_UNICAST;
1272 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1274 tx->flags |= IEEE80211_TX_UNICAST;
1275 if (unlikely(local->wifi_wme_noack_test))
1276 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1278 * Flags are initialized to 0. Hence, no need to
1279 * explicitly unset IEEE80211_TX_CTL_NO_ACK since
1280 * it might already be set for injected frames.
1284 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1285 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1286 skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1287 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1288 tx->flags |= IEEE80211_TX_FRAGMENTED;
1290 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1294 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1295 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1296 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1298 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1299 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1300 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1301 tx->ethertype = (pos[0] << 8) | pos[1];
1303 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1309 * Returns false if the frame couldn't be transmitted but was queued instead.
1311 static bool __ieee80211_tx(struct ieee80211_local *local, struct sk_buff **skbp,
1312 struct sta_info *sta, bool txpending)
1314 struct sk_buff *skb = *skbp, *next;
1315 struct ieee80211_tx_info *info;
1316 struct ieee80211_sub_if_data *sdata;
1317 unsigned long flags;
1322 int q = skb_get_queue_mapping(skb);
1325 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1326 if (local->queue_stop_reasons[q] ||
1327 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1329 * Since queue is stopped, queue up frames for later
1330 * transmission from the tx-pending tasklet when the
1331 * queue is woken again.
1338 * NB: If txpending is true, next must already
1339 * be NULL since we must've gone through this
1340 * loop before already; therefore we can just
1341 * queue the frame to the head without worrying
1342 * about reordering of fragments.
1344 if (unlikely(txpending))
1345 __skb_queue_head(&local->pending[q],
1348 __skb_queue_tail(&local->pending[q],
1350 } while ((skb = next));
1352 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1356 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1358 info = IEEE80211_SKB_CB(skb);
1361 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1362 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1368 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
1370 sdata = vif_to_sdata(info->control.vif);
1372 switch (sdata->vif.type) {
1373 case NL80211_IFTYPE_MONITOR:
1374 info->control.vif = NULL;
1376 case NL80211_IFTYPE_AP_VLAN:
1377 info->control.vif = &container_of(sdata->bss,
1378 struct ieee80211_sub_if_data, u.ap)->vif;
1385 if (sta && sta->uploaded)
1386 info->control.sta = &sta->sta;
1388 info->control.sta = NULL;
1390 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1393 ieee80211_tpt_led_trig_tx(local, fc, len);
1395 ieee80211_led_tx(local, 1);
1403 * Invoke TX handlers, return 0 on success and non-zero if the
1404 * frame was dropped or queued.
1406 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1408 struct sk_buff *skb = tx->skb;
1409 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1410 ieee80211_tx_result res = TX_DROP;
1412 #define CALL_TXH(txh) \
1415 if (res != TX_CONTINUE) \
1419 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1420 CALL_TXH(ieee80211_tx_h_check_assoc);
1421 CALL_TXH(ieee80211_tx_h_ps_buf);
1422 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1423 CALL_TXH(ieee80211_tx_h_select_key);
1424 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1425 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1427 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
1430 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1431 CALL_TXH(ieee80211_tx_h_sequence);
1432 CALL_TXH(ieee80211_tx_h_fragment);
1433 /* handlers after fragment must be aware of tx info fragmentation! */
1434 CALL_TXH(ieee80211_tx_h_stats);
1435 CALL_TXH(ieee80211_tx_h_encrypt);
1436 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1437 CALL_TXH(ieee80211_tx_h_calculate_duration);
1441 if (unlikely(res == TX_DROP)) {
1442 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1444 struct sk_buff *next;
1451 } else if (unlikely(res == TX_QUEUED)) {
1452 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1460 * Returns false if the frame couldn't be transmitted but was queued instead.
1462 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1463 struct sk_buff *skb, bool txpending)
1465 struct ieee80211_local *local = sdata->local;
1466 struct ieee80211_tx_data tx;
1467 ieee80211_tx_result res_prepare;
1468 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1471 if (unlikely(skb->len < 10)) {
1478 /* initialises tx */
1479 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1481 if (unlikely(res_prepare == TX_DROP)) {
1484 } else if (unlikely(res_prepare == TX_QUEUED)) {
1488 tx.channel = local->hw.conf.channel;
1489 info->band = tx.channel->band;
1491 if (!invoke_tx_handlers(&tx))
1492 result = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1498 /* device xmit handlers */
1500 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1501 struct sk_buff *skb,
1502 int head_need, bool may_encrypt)
1504 struct ieee80211_local *local = sdata->local;
1507 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1508 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1509 tail_need -= skb_tailroom(skb);
1510 tail_need = max_t(int, tail_need, 0);
1513 if (head_need || tail_need) {
1514 /* Sorry. Can't account for this any more */
1518 if (skb_cloned(skb))
1519 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1520 else if (head_need || tail_need)
1521 I802_DEBUG_INC(local->tx_expand_skb_head);
1525 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1526 wiphy_debug(local->hw.wiphy,
1527 "failed to reallocate TX buffer\n");
1531 /* update truesize too */
1532 skb->truesize += head_need + tail_need;
1537 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1539 struct ieee80211_local *local = sdata->local;
1540 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1541 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1542 struct ieee80211_sub_if_data *tmp_sdata;
1548 if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1552 info->flags |= IEEE80211_TX_CTL_INJECTED |
1553 IEEE80211_TX_INTFL_HAS_RADIOTAP;
1555 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1556 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1557 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1559 /* check the header is complete in the frame */
1560 if (likely(skb->len >= len_rthdr + hdrlen)) {
1562 * We process outgoing injected frames that have a
1563 * local address we handle as though they are our
1565 * This code here isn't entirely correct, the local
1566 * MAC address is not necessarily enough to find
1567 * the interface to use; for that proper VLAN/WDS
1568 * support we will need a different mechanism.
1571 list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1573 if (!ieee80211_sdata_running(tmp_sdata))
1575 if (tmp_sdata->vif.type ==
1576 NL80211_IFTYPE_MONITOR ||
1577 tmp_sdata->vif.type ==
1578 NL80211_IFTYPE_AP_VLAN ||
1579 tmp_sdata->vif.type ==
1582 if (compare_ether_addr(tmp_sdata->vif.addr,
1591 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1593 headroom = local->tx_headroom;
1595 headroom += IEEE80211_ENCRYPT_HEADROOM;
1596 headroom -= skb_headroom(skb);
1597 headroom = max_t(int, 0, headroom);
1599 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1605 hdr = (struct ieee80211_hdr *) skb->data;
1606 info->control.vif = &sdata->vif;
1608 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1609 ieee80211_is_data(hdr->frame_control) &&
1610 !is_multicast_ether_addr(hdr->addr1))
1611 if (mesh_nexthop_lookup(skb, sdata)) {
1612 /* skb queued: don't free */
1617 ieee80211_set_qos_hdr(sdata, skb);
1618 ieee80211_tx(sdata, skb, false);
1622 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1623 struct net_device *dev)
1625 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1626 struct ieee80211_channel *chan = local->hw.conf.channel;
1627 struct ieee80211_radiotap_header *prthdr =
1628 (struct ieee80211_radiotap_header *)skb->data;
1629 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1630 struct ieee80211_hdr *hdr;
1635 * Frame injection is not allowed if beaconing is not allowed
1636 * or if we need radar detection. Beaconing is usually not allowed when
1637 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1638 * Passive scan is also used in world regulatory domains where
1639 * your country is not known and as such it should be treated as
1640 * NO TX unless the channel is explicitly allowed in which case
1641 * your current regulatory domain would not have the passive scan
1644 * Since AP mode uses monitor interfaces to inject/TX management
1645 * frames we can make AP mode the exception to this rule once it
1646 * supports radar detection as its implementation can deal with
1647 * radar detection by itself. We can do that later by adding a
1648 * monitor flag interfaces used for AP support.
1650 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1651 IEEE80211_CHAN_PASSIVE_SCAN)))
1654 /* check for not even having the fixed radiotap header part */
1655 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1656 goto fail; /* too short to be possibly valid */
1658 /* is it a header version we can trust to find length from? */
1659 if (unlikely(prthdr->it_version))
1660 goto fail; /* only version 0 is supported */
1662 /* then there must be a radiotap header with a length we can use */
1663 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1665 /* does the skb contain enough to deliver on the alleged length? */
1666 if (unlikely(skb->len < len_rthdr))
1667 goto fail; /* skb too short for claimed rt header extent */
1670 * fix up the pointers accounting for the radiotap
1671 * header still being in there. We are being given
1672 * a precooked IEEE80211 header so no need for
1675 skb_set_mac_header(skb, len_rthdr);
1677 * these are just fixed to the end of the rt area since we
1678 * don't have any better information and at this point, nobody cares
1680 skb_set_network_header(skb, len_rthdr);
1681 skb_set_transport_header(skb, len_rthdr);
1684 * Initialize skb->protocol if the injected frame is a data frame
1685 * carrying a rfc1042 header
1687 if (skb->len > len_rthdr + 2) {
1688 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1689 if (ieee80211_is_data(hdr->frame_control) &&
1690 skb->len >= len_rthdr +
1691 ieee80211_hdrlen(hdr->frame_control) +
1692 sizeof(rfc1042_header) + 2) {
1693 payload = (u8 *)hdr +
1694 ieee80211_hdrlen(hdr->frame_control);
1695 if (compare_ether_addr(payload, rfc1042_header) == 0)
1696 skb->protocol = cpu_to_be16((payload[6] << 8) |
1701 memset(info, 0, sizeof(*info));
1703 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1705 /* pass the radiotap header up to xmit */
1706 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1707 return NETDEV_TX_OK;
1711 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1715 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1716 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1717 * @skb: packet to be sent
1718 * @dev: incoming interface
1720 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1721 * not be freed, and caller is responsible for either retrying later or freeing
1724 * This function takes in an Ethernet header and encapsulates it with suitable
1725 * IEEE 802.11 header based on which interface the packet is coming in. The
1726 * encapsulated packet will then be passed to master interface, wlan#.11, for
1727 * transmission (through low-level driver).
1729 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1730 struct net_device *dev)
1732 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1733 struct ieee80211_local *local = sdata->local;
1734 struct ieee80211_tx_info *info;
1735 int ret = NETDEV_TX_BUSY, head_need;
1736 u16 ethertype, hdrlen, meshhdrlen = 0;
1738 struct ieee80211_hdr hdr;
1739 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1740 struct mesh_path __maybe_unused *mppath = NULL;
1741 const u8 *encaps_data;
1742 int encaps_len, skip_header_bytes;
1744 struct sta_info *sta = NULL;
1745 bool wme_sta = false, authorized = false, tdls_auth = false;
1746 struct sk_buff *tmp_skb;
1747 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 mppath = mpp_path_lookup(skb->data, sdata);
1808 * Use address extension if it is a packet from
1809 * another interface or if we know the destination
1810 * is being proxied by a portal (i.e. portal address
1811 * differs from proxied address)
1813 if (compare_ether_addr(sdata->vif.addr,
1814 skb->data + ETH_ALEN) == 0 &&
1815 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
1816 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1817 skb->data, skb->data + ETH_ALEN);
1819 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1822 int is_mesh_mcast = 1;
1825 if (is_multicast_ether_addr(skb->data))
1826 /* DA TA mSA AE:SA */
1827 mesh_da = skb->data;
1829 static const u8 bcast[ETH_ALEN] =
1830 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1832 /* RA TA mDA mSA AE:DA SA */
1833 mesh_da = mppath->mpp;
1836 /* DA TA mSA AE:SA */
1840 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1841 mesh_da, sdata->vif.addr);
1845 ieee80211_new_mesh_header(&mesh_hdr,
1847 skb->data + ETH_ALEN,
1851 ieee80211_new_mesh_header(&mesh_hdr,
1854 skb->data + ETH_ALEN);
1859 case NL80211_IFTYPE_STATION:
1860 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1861 bool tdls_peer = false;
1864 sta = sta_info_get(sdata, skb->data);
1866 authorized = test_sta_flag(sta,
1867 WLAN_STA_AUTHORIZED);
1868 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1869 tdls_peer = test_sta_flag(sta,
1870 WLAN_STA_TDLS_PEER);
1871 tdls_auth = test_sta_flag(sta,
1872 WLAN_STA_TDLS_PEER_AUTH);
1877 * If the TDLS link is enabled, send everything
1878 * directly. Otherwise, allow TDLS setup frames
1879 * to be transmitted indirectly.
1881 tdls_direct = tdls_peer && (tdls_auth ||
1882 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1883 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1887 /* link during setup - throw out frames to peer */
1894 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1895 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1896 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1898 } else if (sdata->u.mgd.use_4addr &&
1899 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1900 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1901 IEEE80211_FCTL_TODS);
1903 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1904 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1905 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1906 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1909 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1911 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1912 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1913 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1917 case NL80211_IFTYPE_ADHOC:
1919 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1920 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1921 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1930 * There's no need to try to look up the destination
1931 * if it is a multicast address (which can only happen
1934 if (!is_multicast_ether_addr(hdr.addr1)) {
1936 sta = sta_info_get(sdata, hdr.addr1);
1938 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1939 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1944 /* For mesh, the use of the QoS header is mandatory */
1945 if (ieee80211_vif_is_mesh(&sdata->vif))
1948 /* receiver and we are QoS enabled, use a QoS type frame */
1949 if (wme_sta && local->hw.queues >= 4) {
1950 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1955 * Drop unicast frames to unauthorised stations unless they are
1956 * EAPOL frames from the local station.
1958 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1959 unlikely(!is_multicast_ether_addr(hdr.addr1) && !authorized &&
1960 !(cpu_to_be16(ethertype) == sdata->control_port_protocol &&
1961 compare_ether_addr(sdata->vif.addr,
1962 skb->data + ETH_ALEN) == 0))) {
1963 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1964 if (net_ratelimit())
1965 printk(KERN_DEBUG "%s: dropped frame to %pM"
1966 " (unauthorized port)\n", dev->name,
1970 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1977 * If the skb is shared we need to obtain our own copy.
1979 if (skb_shared(skb)) {
1981 skb = skb_clone(skb, GFP_ATOMIC);
1990 hdr.frame_control = fc;
1991 hdr.duration_id = 0;
1994 skip_header_bytes = ETH_HLEN;
1995 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1996 encaps_data = bridge_tunnel_header;
1997 encaps_len = sizeof(bridge_tunnel_header);
1998 skip_header_bytes -= 2;
1999 } else if (ethertype >= 0x600) {
2000 encaps_data = rfc1042_header;
2001 encaps_len = sizeof(rfc1042_header);
2002 skip_header_bytes -= 2;
2008 nh_pos = skb_network_header(skb) - skb->data;
2009 h_pos = skb_transport_header(skb) - skb->data;
2011 skb_pull(skb, skip_header_bytes);
2012 nh_pos -= skip_header_bytes;
2013 h_pos -= skip_header_bytes;
2015 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2018 * So we need to modify the skb header and hence need a copy of
2019 * that. The head_need variable above doesn't, so far, include
2020 * the needed header space that we don't need right away. If we
2021 * can, then we don't reallocate right now but only after the
2022 * frame arrives at the master device (if it does...)
2024 * If we cannot, however, then we will reallocate to include all
2025 * the ever needed space. Also, if we need to reallocate it anyway,
2026 * make it big enough for everything we may ever need.
2029 if (head_need > 0 || skb_cloned(skb)) {
2030 head_need += IEEE80211_ENCRYPT_HEADROOM;
2031 head_need += local->tx_headroom;
2032 head_need = max_t(int, 0, head_need);
2033 if (ieee80211_skb_resize(sdata, skb, head_need, true))
2038 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2039 nh_pos += encaps_len;
2040 h_pos += encaps_len;
2043 #ifdef CONFIG_MAC80211_MESH
2044 if (meshhdrlen > 0) {
2045 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2046 nh_pos += meshhdrlen;
2047 h_pos += meshhdrlen;
2051 if (ieee80211_is_data_qos(fc)) {
2052 __le16 *qos_control;
2054 qos_control = (__le16*) skb_push(skb, 2);
2055 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2057 * Maybe we could actually set some fields here, for now just
2058 * initialise to zero to indicate no special operation.
2062 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2067 dev->stats.tx_packets++;
2068 dev->stats.tx_bytes += skb->len;
2070 /* Update skb pointers to various headers since this modified frame
2071 * is going to go through Linux networking code that may potentially
2072 * need things like pointer to IP header. */
2073 skb_set_mac_header(skb, 0);
2074 skb_set_network_header(skb, nh_pos);
2075 skb_set_transport_header(skb, h_pos);
2077 info = IEEE80211_SKB_CB(skb);
2078 memset(info, 0, sizeof(*info));
2080 dev->trans_start = jiffies;
2081 ieee80211_xmit(sdata, skb);
2083 return NETDEV_TX_OK;
2086 if (ret == NETDEV_TX_OK)
2094 * ieee80211_clear_tx_pending may not be called in a context where
2095 * it is possible that it packets could come in again.
2097 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2101 for (i = 0; i < local->hw.queues; i++)
2102 skb_queue_purge(&local->pending[i]);
2106 * Returns false if the frame couldn't be transmitted but was queued instead,
2107 * which in this case means re-queued -- take as an indication to stop sending
2108 * more pending frames.
2110 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2111 struct sk_buff *skb)
2113 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2114 struct ieee80211_sub_if_data *sdata;
2115 struct sta_info *sta;
2116 struct ieee80211_hdr *hdr;
2119 sdata = vif_to_sdata(info->control.vif);
2121 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2122 result = ieee80211_tx(sdata, skb, true);
2124 hdr = (struct ieee80211_hdr *)skb->data;
2125 sta = sta_info_get(sdata, hdr->addr1);
2127 result = __ieee80211_tx(local, &skb, sta, true);
2134 * Transmit all pending packets. Called from tasklet.
2136 void ieee80211_tx_pending(unsigned long data)
2138 struct ieee80211_local *local = (struct ieee80211_local *)data;
2139 struct ieee80211_sub_if_data *sdata;
2140 unsigned long flags;
2146 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2147 for (i = 0; i < local->hw.queues; i++) {
2149 * If queue is stopped by something other than due to pending
2150 * frames, or we have no pending frames, proceed to next queue.
2152 if (local->queue_stop_reasons[i] ||
2153 skb_queue_empty(&local->pending[i]))
2156 while (!skb_queue_empty(&local->pending[i])) {
2157 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2158 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2160 if (WARN_ON(!info->control.vif)) {
2165 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2168 txok = ieee80211_tx_pending_skb(local, skb);
2169 spin_lock_irqsave(&local->queue_stop_reason_lock,
2175 if (skb_queue_empty(&local->pending[i]))
2176 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2177 netif_wake_subqueue(sdata->dev, i);
2179 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2184 /* functions for drivers to get certain frames */
2186 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2187 struct sk_buff *skb,
2188 struct beacon_data *beacon)
2192 int i, have_bits = 0, n1, n2;
2194 /* Generate bitmap for TIM only if there are any STAs in power save
2196 if (atomic_read(&bss->num_sta_ps) > 0)
2197 /* in the hope that this is faster than
2198 * checking byte-for-byte */
2199 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2200 IEEE80211_MAX_AID+1);
2202 if (bss->dtim_count == 0)
2203 bss->dtim_count = beacon->dtim_period - 1;
2207 tim = pos = (u8 *) skb_put(skb, 6);
2208 *pos++ = WLAN_EID_TIM;
2210 *pos++ = bss->dtim_count;
2211 *pos++ = beacon->dtim_period;
2213 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2216 bss->dtim_bc_mc = aid0 == 1;
2219 /* Find largest even number N1 so that bits numbered 1 through
2220 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2221 * (N2 + 1) x 8 through 2007 are 0. */
2223 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2230 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2237 /* Bitmap control */
2239 /* Part Virt Bitmap */
2240 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2242 tim[1] = n2 - n1 + 4;
2243 skb_put(skb, n2 - n1);
2245 *pos++ = aid0; /* Bitmap control */
2246 *pos++ = 0; /* Part Virt Bitmap */
2250 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2251 struct ieee80211_vif *vif,
2252 u16 *tim_offset, u16 *tim_length)
2254 struct ieee80211_local *local = hw_to_local(hw);
2255 struct sk_buff *skb = NULL;
2256 struct ieee80211_tx_info *info;
2257 struct ieee80211_sub_if_data *sdata = NULL;
2258 struct ieee80211_if_ap *ap = NULL;
2259 struct beacon_data *beacon;
2260 struct ieee80211_supported_band *sband;
2261 enum ieee80211_band band = local->hw.conf.channel->band;
2262 struct ieee80211_tx_rate_control txrc;
2264 sband = local->hw.wiphy->bands[band];
2268 sdata = vif_to_sdata(vif);
2270 if (!ieee80211_sdata_running(sdata))
2278 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2280 beacon = rcu_dereference(ap->beacon);
2283 * headroom, head length,
2284 * tail length and maximum TIM length
2286 skb = dev_alloc_skb(local->tx_headroom +
2288 beacon->tail_len + 256);
2292 skb_reserve(skb, local->tx_headroom);
2293 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2297 * Not very nice, but we want to allow the driver to call
2298 * ieee80211_beacon_get() as a response to the set_tim()
2299 * callback. That, however, is already invoked under the
2300 * sta_lock to guarantee consistent and race-free update
2301 * of the tim bitmap in mac80211 and the driver.
2303 if (local->tim_in_locked_section) {
2304 ieee80211_beacon_add_tim(ap, skb, beacon);
2306 unsigned long flags;
2308 spin_lock_irqsave(&local->sta_lock, flags);
2309 ieee80211_beacon_add_tim(ap, skb, beacon);
2310 spin_unlock_irqrestore(&local->sta_lock, flags);
2314 *tim_offset = beacon->head_len;
2316 *tim_length = skb->len - beacon->head_len;
2319 memcpy(skb_put(skb, beacon->tail_len),
2320 beacon->tail, beacon->tail_len);
2323 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2324 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2325 struct ieee80211_hdr *hdr;
2326 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2331 skb = skb_copy(presp, GFP_ATOMIC);
2335 hdr = (struct ieee80211_hdr *) skb->data;
2336 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2337 IEEE80211_STYPE_BEACON);
2338 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2339 struct ieee80211_mgmt *mgmt;
2342 #ifdef CONFIG_MAC80211_MESH
2343 if (!sdata->u.mesh.mesh_id_len)
2347 /* headroom, head length, tail length and maximum TIM length */
2348 skb = dev_alloc_skb(local->tx_headroom + 400 +
2349 sdata->u.mesh.ie_len);
2353 skb_reserve(skb, local->hw.extra_tx_headroom);
2354 mgmt = (struct ieee80211_mgmt *)
2355 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2356 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2357 mgmt->frame_control =
2358 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2359 memset(mgmt->da, 0xff, ETH_ALEN);
2360 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2361 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2362 mgmt->u.beacon.beacon_int =
2363 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2364 mgmt->u.beacon.capab_info |= cpu_to_le16(
2365 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
2367 pos = skb_put(skb, 2);
2368 *pos++ = WLAN_EID_SSID;
2371 if (ieee80211_add_srates_ie(&sdata->vif, skb) ||
2372 mesh_add_ds_params_ie(skb, sdata) ||
2373 ieee80211_add_ext_srates_ie(&sdata->vif, skb) ||
2374 mesh_add_rsn_ie(skb, sdata) ||
2375 mesh_add_meshid_ie(skb, sdata) ||
2376 mesh_add_meshconf_ie(skb, sdata) ||
2377 mesh_add_vendor_ies(skb, sdata)) {
2378 pr_err("o11s: couldn't add ies!\n");
2386 info = IEEE80211_SKB_CB(skb);
2388 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2389 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2392 memset(&txrc, 0, sizeof(txrc));
2395 txrc.bss_conf = &sdata->vif.bss_conf;
2397 txrc.reported_rate.idx = -1;
2398 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2399 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2400 txrc.max_rate_idx = -1;
2402 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2404 rate_control_get_rate(sdata, NULL, &txrc);
2406 info->control.vif = vif;
2408 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2409 IEEE80211_TX_CTL_ASSIGN_SEQ |
2410 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2415 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2417 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2418 struct ieee80211_vif *vif)
2420 struct ieee80211_sub_if_data *sdata;
2421 struct ieee80211_if_managed *ifmgd;
2422 struct ieee80211_pspoll *pspoll;
2423 struct ieee80211_local *local;
2424 struct sk_buff *skb;
2426 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2429 sdata = vif_to_sdata(vif);
2430 ifmgd = &sdata->u.mgd;
2431 local = sdata->local;
2433 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2437 skb_reserve(skb, local->hw.extra_tx_headroom);
2439 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2440 memset(pspoll, 0, sizeof(*pspoll));
2441 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2442 IEEE80211_STYPE_PSPOLL);
2443 pspoll->aid = cpu_to_le16(ifmgd->aid);
2445 /* aid in PS-Poll has its two MSBs each set to 1 */
2446 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2448 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2449 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2453 EXPORT_SYMBOL(ieee80211_pspoll_get);
2455 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2456 struct ieee80211_vif *vif)
2458 struct ieee80211_hdr_3addr *nullfunc;
2459 struct ieee80211_sub_if_data *sdata;
2460 struct ieee80211_if_managed *ifmgd;
2461 struct ieee80211_local *local;
2462 struct sk_buff *skb;
2464 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2467 sdata = vif_to_sdata(vif);
2468 ifmgd = &sdata->u.mgd;
2469 local = sdata->local;
2471 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2475 skb_reserve(skb, local->hw.extra_tx_headroom);
2477 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2479 memset(nullfunc, 0, sizeof(*nullfunc));
2480 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2481 IEEE80211_STYPE_NULLFUNC |
2482 IEEE80211_FCTL_TODS);
2483 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2484 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2485 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2489 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2491 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2492 struct ieee80211_vif *vif,
2493 const u8 *ssid, size_t ssid_len,
2494 const u8 *ie, size_t ie_len)
2496 struct ieee80211_sub_if_data *sdata;
2497 struct ieee80211_local *local;
2498 struct ieee80211_hdr_3addr *hdr;
2499 struct sk_buff *skb;
2503 sdata = vif_to_sdata(vif);
2504 local = sdata->local;
2505 ie_ssid_len = 2 + ssid_len;
2507 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2508 ie_ssid_len + ie_len);
2512 skb_reserve(skb, local->hw.extra_tx_headroom);
2514 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2515 memset(hdr, 0, sizeof(*hdr));
2516 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2517 IEEE80211_STYPE_PROBE_REQ);
2518 memset(hdr->addr1, 0xff, ETH_ALEN);
2519 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2520 memset(hdr->addr3, 0xff, ETH_ALEN);
2522 pos = skb_put(skb, ie_ssid_len);
2523 *pos++ = WLAN_EID_SSID;
2526 memcpy(pos, ssid, ssid_len);
2530 pos = skb_put(skb, ie_len);
2531 memcpy(pos, ie, ie_len);
2536 EXPORT_SYMBOL(ieee80211_probereq_get);
2538 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2539 const void *frame, size_t frame_len,
2540 const struct ieee80211_tx_info *frame_txctl,
2541 struct ieee80211_rts *rts)
2543 const struct ieee80211_hdr *hdr = frame;
2545 rts->frame_control =
2546 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2547 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2549 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2550 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2552 EXPORT_SYMBOL(ieee80211_rts_get);
2554 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2555 const void *frame, size_t frame_len,
2556 const struct ieee80211_tx_info *frame_txctl,
2557 struct ieee80211_cts *cts)
2559 const struct ieee80211_hdr *hdr = frame;
2561 cts->frame_control =
2562 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2563 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2564 frame_len, frame_txctl);
2565 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2567 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2570 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2571 struct ieee80211_vif *vif)
2573 struct ieee80211_local *local = hw_to_local(hw);
2574 struct sk_buff *skb = NULL;
2575 struct ieee80211_tx_data tx;
2576 struct ieee80211_sub_if_data *sdata;
2577 struct ieee80211_if_ap *bss = NULL;
2578 struct beacon_data *beacon;
2579 struct ieee80211_tx_info *info;
2581 sdata = vif_to_sdata(vif);
2585 beacon = rcu_dereference(bss->beacon);
2587 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2590 if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2591 goto out; /* send buffered bc/mc only after DTIM beacon */
2594 skb = skb_dequeue(&bss->ps_bc_buf);
2597 local->total_ps_buffered--;
2599 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2600 struct ieee80211_hdr *hdr =
2601 (struct ieee80211_hdr *) skb->data;
2602 /* more buffered multicast/broadcast frames ==> set
2603 * MoreData flag in IEEE 802.11 header to inform PS
2605 hdr->frame_control |=
2606 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2609 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2611 dev_kfree_skb_any(skb);
2614 info = IEEE80211_SKB_CB(skb);
2616 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2617 tx.channel = local->hw.conf.channel;
2618 info->band = tx.channel->band;
2620 if (invoke_tx_handlers(&tx))
2627 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2629 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
2631 skb_set_mac_header(skb, 0);
2632 skb_set_network_header(skb, 0);
2633 skb_set_transport_header(skb, 0);
2635 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
2636 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
2640 * The other path calling ieee80211_xmit is from the tasklet,
2641 * and while we can handle concurrent transmissions locking
2642 * requirements are that we do not come into tx with bhs on.
2645 ieee80211_xmit(sdata, skb);