2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
42 int rate, mrate, erp, dur, i;
43 struct ieee80211_rate *txrate;
44 struct ieee80211_local *local = tx->local;
45 struct ieee80211_supported_band *sband;
46 struct ieee80211_hdr *hdr;
47 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
49 /* assume HW handles this */
50 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
54 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
57 sband = local->hw.wiphy->bands[tx->channel->band];
58 txrate = &sband->bitrates[info->control.rates[0].idx];
60 erp = txrate->flags & IEEE80211_RATE_ERP_G;
63 * data and mgmt (except PS Poll):
65 * - during contention period:
66 * if addr1 is group address: 0
67 * if more fragments = 0 and addr1 is individual address: time to
68 * transmit one ACK plus SIFS
69 * if more fragments = 1 and addr1 is individual address: time to
70 * transmit next fragment plus 2 x ACK plus 3 x SIFS
73 * - control response frame (CTS or ACK) shall be transmitted using the
74 * same rate as the immediately previous frame in the frame exchange
75 * sequence, if this rate belongs to the PHY mandatory rates, or else
76 * at the highest possible rate belonging to the PHY rates in the
79 hdr = (struct ieee80211_hdr *)tx->skb->data;
80 if (ieee80211_is_ctl(hdr->frame_control)) {
81 /* TODO: These control frames are not currently sent by
82 * mac80211, but should they be implemented, this function
83 * needs to be updated to support duration field calculation.
85 * RTS: time needed to transmit pending data/mgmt frame plus
86 * one CTS frame plus one ACK frame plus 3 x SIFS
87 * CTS: duration of immediately previous RTS minus time
88 * required to transmit CTS and its SIFS
89 * ACK: 0 if immediately previous directed data/mgmt had
90 * more=0, with more=1 duration in ACK frame is duration
91 * from previous frame minus time needed to transmit ACK
93 * PS Poll: BIT(15) | BIT(14) | aid
99 if (0 /* FIX: data/mgmt during CFP */)
100 return cpu_to_le16(32768);
102 if (group_addr) /* Group address as the destination - no ACK */
105 /* Individual destination address:
106 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
107 * CTS and ACK frames shall be transmitted using the highest rate in
108 * basic rate set that is less than or equal to the rate of the
109 * immediately previous frame and that is using the same modulation
110 * (CCK or OFDM). If no basic rate set matches with these requirements,
111 * the highest mandatory rate of the PHY that is less than or equal to
112 * the rate of the previous frame is used.
113 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
116 /* use lowest available if everything fails */
117 mrate = sband->bitrates[0].bitrate;
118 for (i = 0; i < sband->n_bitrates; i++) {
119 struct ieee80211_rate *r = &sband->bitrates[i];
121 if (r->bitrate > txrate->bitrate)
124 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
127 switch (sband->band) {
128 case IEEE80211_BAND_2GHZ: {
130 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
131 flag = IEEE80211_RATE_MANDATORY_G;
133 flag = IEEE80211_RATE_MANDATORY_B;
138 case IEEE80211_BAND_5GHZ:
139 if (r->flags & IEEE80211_RATE_MANDATORY_A)
142 case IEEE80211_NUM_BANDS:
148 /* No matching basic rate found; use highest suitable mandatory
153 /* Time needed to transmit ACK
154 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
155 * to closest integer */
157 dur = ieee80211_frame_duration(local, 10, rate, erp,
158 tx->sdata->vif.bss_conf.use_short_preamble);
161 /* Frame is fragmented: duration increases with time needed to
162 * transmit next fragment plus ACK and 2 x SIFS. */
163 dur *= 2; /* ACK + SIFS */
165 dur += ieee80211_frame_duration(local, next_frag_len,
166 txrate->bitrate, erp,
167 tx->sdata->vif.bss_conf.use_short_preamble);
170 return cpu_to_le16(dur);
173 static inline int is_ieee80211_device(struct ieee80211_local *local,
174 struct net_device *dev)
176 return local == wdev_priv(dev->ieee80211_ptr);
180 static ieee80211_tx_result debug_noinline
181 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
183 struct ieee80211_local *local = tx->local;
184 struct ieee80211_if_managed *ifmgd;
186 /* driver doesn't support power save */
187 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
190 /* hardware does dynamic power save */
191 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
194 /* dynamic power save disabled */
195 if (local->hw.conf.dynamic_ps_timeout <= 0)
198 /* we are scanning, don't enable power save */
202 if (!local->ps_sdata)
205 /* No point if we're going to suspend */
206 if (local->quiescing)
209 /* dynamic ps is supported only in managed mode */
210 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
213 ifmgd = &tx->sdata->u.mgd;
216 * Don't wakeup from power save if u-apsd is enabled, voip ac has
217 * u-apsd enabled and the frame is in voip class. This effectively
218 * means that even if all access categories have u-apsd enabled, in
219 * practise u-apsd is only used with the voip ac. This is a
220 * workaround for the case when received voip class packets do not
221 * have correct qos tag for some reason, due the network or the
224 * Note: local->uapsd_queues access is racy here. If the value is
225 * changed via debugfs, user needs to reassociate manually to have
226 * everything in sync.
228 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
229 && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
230 && skb_get_queue_mapping(tx->skb) == 0)
233 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
234 ieee80211_stop_queues_by_reason(&local->hw,
235 IEEE80211_QUEUE_STOP_REASON_PS);
236 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
237 ieee80211_queue_work(&local->hw,
238 &local->dynamic_ps_disable_work);
241 /* Don't restart the timer if we're not disassociated */
242 if (!ifmgd->associated)
245 mod_timer(&local->dynamic_ps_timer, jiffies +
246 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
251 static ieee80211_tx_result debug_noinline
252 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
255 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
256 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
259 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
262 if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) &&
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);
468 /* sync with ieee80211_sta_ps_deliver_wakeup */
469 spin_lock(&sta->ps_lock);
471 * STA woke up the meantime and all the frames on ps_tx_buf have
472 * been queued to pending queue. No reordering can happen, go
473 * ahead and Tx the packet.
475 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
476 !test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
477 spin_unlock(&sta->ps_lock);
481 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
482 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
483 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
485 printk(KERN_DEBUG "%s: STA %pM TX buffer for "
486 "AC %d full - dropping oldest frame\n",
487 tx->sdata->name, sta->sta.addr, ac);
491 tx->local->total_ps_buffered++;
493 info->control.jiffies = jiffies;
494 info->control.vif = &tx->sdata->vif;
495 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
496 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
497 spin_unlock(&sta->ps_lock);
499 if (!timer_pending(&local->sta_cleanup))
500 mod_timer(&local->sta_cleanup,
501 round_jiffies(jiffies +
502 STA_INFO_CLEANUP_INTERVAL));
505 * We queued up some frames, so the TIM bit might
506 * need to be set, recalculate it.
508 sta_info_recalc_tim(sta);
512 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
513 else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
515 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
516 tx->sdata->name, sta->sta.addr);
518 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
523 static ieee80211_tx_result debug_noinline
524 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
526 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
529 if (tx->flags & IEEE80211_TX_UNICAST)
530 return ieee80211_tx_h_unicast_ps_buf(tx);
532 return ieee80211_tx_h_multicast_ps_buf(tx);
535 static ieee80211_tx_result debug_noinline
536 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
538 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
540 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
541 if (tx->sdata->control_port_no_encrypt)
542 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
543 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
549 static ieee80211_tx_result debug_noinline
550 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
552 struct ieee80211_key *key = NULL;
553 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
554 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
556 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
558 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
560 else if (ieee80211_is_mgmt(hdr->frame_control) &&
561 is_multicast_ether_addr(hdr->addr1) &&
562 ieee80211_is_robust_mgmt_frame(hdr) &&
563 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
565 else if (is_multicast_ether_addr(hdr->addr1) &&
566 (key = rcu_dereference(tx->sdata->default_multicast_key)))
568 else if (!is_multicast_ether_addr(hdr->addr1) &&
569 (key = rcu_dereference(tx->sdata->default_unicast_key)))
571 else if (tx->sdata->drop_unencrypted &&
572 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
573 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
574 (!ieee80211_is_robust_mgmt_frame(hdr) ||
575 (ieee80211_is_action(hdr->frame_control) &&
576 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) {
577 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
583 bool skip_hw = false;
585 tx->key->tx_rx_count++;
586 /* TODO: add threshold stuff again */
588 switch (tx->key->conf.cipher) {
589 case WLAN_CIPHER_SUITE_WEP40:
590 case WLAN_CIPHER_SUITE_WEP104:
591 if (ieee80211_is_auth(hdr->frame_control))
593 case WLAN_CIPHER_SUITE_TKIP:
594 if (!ieee80211_is_data_present(hdr->frame_control))
597 case WLAN_CIPHER_SUITE_CCMP:
598 if (!ieee80211_is_data_present(hdr->frame_control) &&
599 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
603 skip_hw = (tx->key->conf.flags &
604 IEEE80211_KEY_FLAG_SW_MGMT) &&
605 ieee80211_is_mgmt(hdr->frame_control);
607 case WLAN_CIPHER_SUITE_AES_CMAC:
608 if (!ieee80211_is_mgmt(hdr->frame_control))
613 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
616 if (!skip_hw && tx->key &&
617 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
618 info->control.hw_key = &tx->key->conf;
624 static ieee80211_tx_result debug_noinline
625 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
627 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
628 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
629 struct ieee80211_supported_band *sband;
630 struct ieee80211_rate *rate;
633 bool inval = false, rts = false, short_preamble = false;
634 struct ieee80211_tx_rate_control txrc;
637 memset(&txrc, 0, sizeof(txrc));
639 sband = tx->local->hw.wiphy->bands[tx->channel->band];
641 len = min_t(u32, tx->skb->len + FCS_LEN,
642 tx->local->hw.wiphy->frag_threshold);
644 /* set up the tx rate control struct we give the RC algo */
645 txrc.hw = local_to_hw(tx->local);
647 txrc.bss_conf = &tx->sdata->vif.bss_conf;
649 txrc.reported_rate.idx = -1;
650 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
651 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
652 txrc.max_rate_idx = -1;
654 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
655 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
656 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
658 /* set up RTS protection if desired */
659 if (len > tx->local->hw.wiphy->rts_threshold) {
660 txrc.rts = rts = true;
664 * Use short preamble if the BSS can handle it, but not for
665 * management frames unless we know the receiver can handle
666 * that -- the management frame might be to a station that
667 * just wants a probe response.
669 if (tx->sdata->vif.bss_conf.use_short_preamble &&
670 (ieee80211_is_data(hdr->frame_control) ||
671 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
672 txrc.short_preamble = short_preamble = true;
675 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
678 * Lets not bother rate control if we're associated and cannot
679 * talk to the sta. This should not happen.
681 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
682 !rate_usable_index_exists(sband, &tx->sta->sta),
683 "%s: Dropped data frame as no usable bitrate found while "
684 "scanning and associated. Target station: "
685 "%pM on %d GHz band\n",
686 tx->sdata->name, hdr->addr1,
687 tx->channel->band ? 5 : 2))
691 * If we're associated with the sta at this point we know we can at
692 * least send the frame at the lowest bit rate.
694 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
696 if (unlikely(info->control.rates[0].idx < 0))
699 if (txrc.reported_rate.idx < 0) {
700 txrc.reported_rate = info->control.rates[0];
701 if (tx->sta && ieee80211_is_data(hdr->frame_control))
702 tx->sta->last_tx_rate = txrc.reported_rate;
704 tx->sta->last_tx_rate = txrc.reported_rate;
706 if (unlikely(!info->control.rates[0].count))
707 info->control.rates[0].count = 1;
709 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
710 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
711 info->control.rates[0].count = 1;
713 if (is_multicast_ether_addr(hdr->addr1)) {
715 * XXX: verify the rate is in the basic rateset
721 * set up the RTS/CTS rate as the fastest basic rate
722 * that is not faster than the data rate
724 * XXX: Should this check all retry rates?
726 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
729 rate = &sband->bitrates[info->control.rates[0].idx];
731 for (i = 0; i < sband->n_bitrates; i++) {
732 /* must be a basic rate */
733 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
735 /* must not be faster than the data rate */
736 if (sband->bitrates[i].bitrate > rate->bitrate)
739 if (sband->bitrates[baserate].bitrate <
740 sband->bitrates[i].bitrate)
744 info->control.rts_cts_rate_idx = baserate;
747 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
749 * make sure there's no valid rate following
750 * an invalid one, just in case drivers don't
751 * take the API seriously to stop at -1.
754 info->control.rates[i].idx = -1;
757 if (info->control.rates[i].idx < 0) {
763 * For now assume MCS is already set up correctly, this
766 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
767 WARN_ON(info->control.rates[i].idx > 76);
771 /* set up RTS protection if desired */
773 info->control.rates[i].flags |=
774 IEEE80211_TX_RC_USE_RTS_CTS;
777 if (WARN_ON_ONCE(info->control.rates[i].idx >=
778 sband->n_bitrates)) {
779 info->control.rates[i].idx = -1;
783 rate = &sband->bitrates[info->control.rates[i].idx];
785 /* set up short preamble */
786 if (short_preamble &&
787 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
788 info->control.rates[i].flags |=
789 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
791 /* set up G protection */
792 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
793 rate->flags & IEEE80211_RATE_ERP_G)
794 info->control.rates[i].flags |=
795 IEEE80211_TX_RC_USE_CTS_PROTECT;
801 static ieee80211_tx_result debug_noinline
802 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
804 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
805 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
811 * Packet injection may want to control the sequence
812 * number, if we have no matching interface then we
813 * neither assign one ourselves nor ask the driver to.
815 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
818 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
821 if (ieee80211_hdrlen(hdr->frame_control) < 24)
824 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
828 * Anything but QoS data that has a sequence number field
829 * (is long enough) gets a sequence number from the global
832 if (!ieee80211_is_data_qos(hdr->frame_control)) {
833 /* driver should assign sequence number */
834 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
835 /* for pure STA mode without beacons, we can do it */
836 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
837 tx->sdata->sequence_number += 0x10;
842 * This should be true for injected/management frames only, for
843 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
844 * above since they are not QoS-data frames.
849 /* include per-STA, per-TID sequence counter */
851 qc = ieee80211_get_qos_ctl(hdr);
852 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
853 seq = &tx->sta->tid_seq[tid];
855 hdr->seq_ctrl = cpu_to_le16(*seq);
857 /* Increase the sequence number. */
858 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
863 static int ieee80211_fragment(struct ieee80211_local *local,
864 struct sk_buff *skb, int hdrlen,
867 struct sk_buff *tail = skb, *tmp;
868 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
869 int pos = hdrlen + per_fragm;
870 int rem = skb->len - hdrlen - per_fragm;
872 if (WARN_ON(rem < 0))
876 int fraglen = per_fragm;
881 tmp = dev_alloc_skb(local->tx_headroom +
883 IEEE80211_ENCRYPT_HEADROOM +
884 IEEE80211_ENCRYPT_TAILROOM);
889 skb_reserve(tmp, local->tx_headroom +
890 IEEE80211_ENCRYPT_HEADROOM);
891 /* copy control information */
892 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
893 skb_copy_queue_mapping(tmp, skb);
894 tmp->priority = skb->priority;
897 /* copy header and data */
898 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
899 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
904 skb_trim(skb, hdrlen + per_fragm);
908 static ieee80211_tx_result debug_noinline
909 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
911 struct sk_buff *skb = tx->skb;
912 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
913 struct ieee80211_hdr *hdr = (void *)skb->data;
914 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
918 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
921 if (tx->local->ops->set_frag_threshold)
925 * Warn when submitting a fragmented A-MPDU frame and drop it.
926 * This scenario is handled in ieee80211_tx_prepare but extra
927 * caution taken here as fragmented ampdu may cause Tx stop.
929 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
932 hdrlen = ieee80211_hdrlen(hdr->frame_control);
934 /* internal error, why isn't DONTFRAG set? */
935 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
939 * Now fragment the frame. This will allocate all the fragments and
940 * chain them (using skb as the first fragment) to skb->next.
941 * During transmission, we will remove the successfully transmitted
942 * fragments from this list. When the low-level driver rejects one
943 * of the fragments then we will simply pretend to accept the skb
944 * but store it away as pending.
946 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
949 /* update duration/seq/flags of fragments */
953 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
955 hdr = (void *)skb->data;
956 info = IEEE80211_SKB_CB(skb);
959 hdr->frame_control |= morefrags;
960 next_len = skb->next->len;
962 * No multi-rate retries for fragmented frames, that
963 * would completely throw off the NAV at other STAs.
965 info->control.rates[1].idx = -1;
966 info->control.rates[2].idx = -1;
967 info->control.rates[3].idx = -1;
968 info->control.rates[4].idx = -1;
969 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
970 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
972 hdr->frame_control &= ~morefrags;
975 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
976 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
978 } while ((skb = skb->next));
983 static ieee80211_tx_result debug_noinline
984 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
986 struct sk_buff *skb = tx->skb;
991 tx->sta->tx_packets++;
993 tx->sta->tx_fragments++;
994 tx->sta->tx_bytes += skb->len;
995 } while ((skb = skb->next));
1000 static ieee80211_tx_result debug_noinline
1001 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1003 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1008 switch (tx->key->conf.cipher) {
1009 case WLAN_CIPHER_SUITE_WEP40:
1010 case WLAN_CIPHER_SUITE_WEP104:
1011 return ieee80211_crypto_wep_encrypt(tx);
1012 case WLAN_CIPHER_SUITE_TKIP:
1013 return ieee80211_crypto_tkip_encrypt(tx);
1014 case WLAN_CIPHER_SUITE_CCMP:
1015 return ieee80211_crypto_ccmp_encrypt(tx);
1016 case WLAN_CIPHER_SUITE_AES_CMAC:
1017 return ieee80211_crypto_aes_cmac_encrypt(tx);
1019 /* handle hw-only algorithm */
1020 if (info->control.hw_key) {
1021 ieee80211_tx_set_protected(tx);
1031 static ieee80211_tx_result debug_noinline
1032 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1034 struct sk_buff *skb = tx->skb;
1035 struct ieee80211_hdr *hdr;
1040 hdr = (void *) skb->data;
1041 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1042 break; /* must not overwrite AID */
1043 next_len = skb->next ? skb->next->len : 0;
1044 group_addr = is_multicast_ether_addr(hdr->addr1);
1047 ieee80211_duration(tx, group_addr, next_len);
1048 } while ((skb = skb->next));
1053 /* actual transmit path */
1055 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1056 struct sk_buff *skb,
1057 struct ieee80211_tx_info *info,
1058 struct tid_ampdu_tx *tid_tx,
1061 bool queued = false;
1063 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1064 info->flags |= IEEE80211_TX_CTL_AMPDU;
1065 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1067 * nothing -- this aggregation session is being started
1068 * but that might still fail with the driver
1071 spin_lock(&tx->sta->lock);
1073 * Need to re-check now, because we may get here
1075 * 1) in the window during which the setup is actually
1076 * already done, but not marked yet because not all
1077 * packets are spliced over to the driver pending
1078 * queue yet -- if this happened we acquire the lock
1079 * either before or after the splice happens, but
1080 * need to recheck which of these cases happened.
1082 * 2) during session teardown, if the OPERATIONAL bit
1083 * was cleared due to the teardown but the pointer
1084 * hasn't been assigned NULL yet (or we loaded it
1085 * before it was assigned) -- in this case it may
1086 * now be NULL which means we should just let the
1087 * packet pass through because splicing the frames
1088 * back is already done.
1090 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1093 /* do nothing, let packet pass through */
1094 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1095 info->flags |= IEEE80211_TX_CTL_AMPDU;
1098 info->control.vif = &tx->sdata->vif;
1099 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1100 __skb_queue_tail(&tid_tx->pending, skb);
1102 spin_unlock(&tx->sta->lock);
1111 static ieee80211_tx_result
1112 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1113 struct ieee80211_tx_data *tx,
1114 struct sk_buff *skb)
1116 struct ieee80211_local *local = sdata->local;
1117 struct ieee80211_hdr *hdr;
1118 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1122 memset(tx, 0, sizeof(*tx));
1126 tx->channel = local->hw.conf.channel;
1129 * If this flag is set to true anywhere, and we get here,
1130 * we are doing the needed processing, so remove the flag
1133 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1135 hdr = (struct ieee80211_hdr *) skb->data;
1137 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1138 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1139 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1141 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1142 tx->sdata->control_port_protocol == tx->skb->protocol) {
1143 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1146 tx->sta = sta_info_get(sdata, hdr->addr1);
1148 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1149 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1150 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1151 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1152 struct tid_ampdu_tx *tid_tx;
1154 qc = ieee80211_get_qos_ctl(hdr);
1155 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1157 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1161 queued = ieee80211_tx_prep_agg(tx, skb, info,
1164 if (unlikely(queued))
1169 if (is_multicast_ether_addr(hdr->addr1)) {
1170 tx->flags &= ~IEEE80211_TX_UNICAST;
1171 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1173 tx->flags |= IEEE80211_TX_UNICAST;
1174 if (unlikely(local->wifi_wme_noack_test))
1175 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1177 * Flags are initialized to 0. Hence, no need to
1178 * explicitly unset IEEE80211_TX_CTL_NO_ACK since
1179 * it might already be set for injected frames.
1183 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1184 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1185 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1186 info->flags & IEEE80211_TX_CTL_AMPDU)
1187 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1191 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1192 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1193 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1195 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1201 * Returns false if the frame couldn't be transmitted but was queued instead.
1203 static bool __ieee80211_tx(struct ieee80211_local *local, struct sk_buff **skbp,
1204 struct sta_info *sta, bool txpending)
1206 struct sk_buff *skb = *skbp, *next;
1207 struct ieee80211_tx_info *info;
1208 struct ieee80211_sub_if_data *sdata;
1209 unsigned long flags;
1214 int q = skb_get_queue_mapping(skb);
1217 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1218 if (local->queue_stop_reasons[q] ||
1219 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1221 * Since queue is stopped, queue up frames for later
1222 * transmission from the tx-pending tasklet when the
1223 * queue is woken again.
1230 * NB: If txpending is true, next must already
1231 * be NULL since we must've gone through this
1232 * loop before already; therefore we can just
1233 * queue the frame to the head without worrying
1234 * about reordering of fragments.
1236 if (unlikely(txpending))
1237 __skb_queue_head(&local->pending[q],
1240 __skb_queue_tail(&local->pending[q],
1242 } while ((skb = next));
1244 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1248 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1250 info = IEEE80211_SKB_CB(skb);
1253 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1254 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1260 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
1262 sdata = vif_to_sdata(info->control.vif);
1264 switch (sdata->vif.type) {
1265 case NL80211_IFTYPE_MONITOR:
1266 info->control.vif = NULL;
1268 case NL80211_IFTYPE_AP_VLAN:
1269 info->control.vif = &container_of(sdata->bss,
1270 struct ieee80211_sub_if_data, u.ap)->vif;
1277 if (sta && sta->uploaded)
1278 info->control.sta = &sta->sta;
1280 info->control.sta = NULL;
1282 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1285 ieee80211_tpt_led_trig_tx(local, fc, len);
1287 ieee80211_led_tx(local, 1);
1295 * Invoke TX handlers, return 0 on success and non-zero if the
1296 * frame was dropped or queued.
1298 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1300 struct sk_buff *skb = tx->skb;
1301 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1302 ieee80211_tx_result res = TX_DROP;
1304 #define CALL_TXH(txh) \
1307 if (res != TX_CONTINUE) \
1311 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1312 CALL_TXH(ieee80211_tx_h_check_assoc);
1313 CALL_TXH(ieee80211_tx_h_ps_buf);
1314 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1315 CALL_TXH(ieee80211_tx_h_select_key);
1316 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1317 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1319 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
1322 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1323 CALL_TXH(ieee80211_tx_h_sequence);
1324 CALL_TXH(ieee80211_tx_h_fragment);
1325 /* handlers after fragment must be aware of tx info fragmentation! */
1326 CALL_TXH(ieee80211_tx_h_stats);
1327 CALL_TXH(ieee80211_tx_h_encrypt);
1328 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1329 CALL_TXH(ieee80211_tx_h_calculate_duration);
1333 if (unlikely(res == TX_DROP)) {
1334 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1336 struct sk_buff *next;
1343 } else if (unlikely(res == TX_QUEUED)) {
1344 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1352 * Returns false if the frame couldn't be transmitted but was queued instead.
1354 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1355 struct sk_buff *skb, bool txpending)
1357 struct ieee80211_local *local = sdata->local;
1358 struct ieee80211_tx_data tx;
1359 ieee80211_tx_result res_prepare;
1360 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1363 if (unlikely(skb->len < 10)) {
1370 /* initialises tx */
1371 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1373 if (unlikely(res_prepare == TX_DROP)) {
1376 } else if (unlikely(res_prepare == TX_QUEUED)) {
1380 tx.channel = local->hw.conf.channel;
1381 info->band = tx.channel->band;
1383 if (!invoke_tx_handlers(&tx))
1384 result = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1390 /* device xmit handlers */
1392 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1393 struct sk_buff *skb,
1394 int head_need, bool may_encrypt)
1396 struct ieee80211_local *local = sdata->local;
1399 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1400 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1401 tail_need -= skb_tailroom(skb);
1402 tail_need = max_t(int, tail_need, 0);
1405 if (skb_cloned(skb))
1406 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1407 else if (head_need || tail_need)
1408 I802_DEBUG_INC(local->tx_expand_skb_head);
1412 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1413 wiphy_debug(local->hw.wiphy,
1414 "failed to reallocate TX buffer\n");
1421 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1423 struct ieee80211_local *local = sdata->local;
1424 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1425 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1431 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1433 headroom = local->tx_headroom;
1435 headroom += IEEE80211_ENCRYPT_HEADROOM;
1436 headroom -= skb_headroom(skb);
1437 headroom = max_t(int, 0, headroom);
1439 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1445 hdr = (struct ieee80211_hdr *) skb->data;
1446 info->control.vif = &sdata->vif;
1448 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1449 ieee80211_is_data(hdr->frame_control) &&
1450 !is_multicast_ether_addr(hdr->addr1))
1451 if (mesh_nexthop_lookup(skb, sdata)) {
1452 /* skb queued: don't free */
1457 ieee80211_set_qos_hdr(sdata, skb);
1458 ieee80211_tx(sdata, skb, false);
1462 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1464 struct ieee80211_radiotap_iterator iterator;
1465 struct ieee80211_radiotap_header *rthdr =
1466 (struct ieee80211_radiotap_header *) skb->data;
1467 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1468 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1472 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1473 IEEE80211_TX_CTL_DONTFRAG;
1476 * for every radiotap entry that is present
1477 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1478 * entries present, or -EINVAL on error)
1482 ret = ieee80211_radiotap_iterator_next(&iterator);
1487 /* see if this argument is something we can use */
1488 switch (iterator.this_arg_index) {
1490 * You must take care when dereferencing iterator.this_arg
1491 * for multibyte types... the pointer is not aligned. Use
1492 * get_unaligned((type *)iterator.this_arg) to dereference
1493 * iterator.this_arg for type "type" safely on all arches.
1495 case IEEE80211_RADIOTAP_FLAGS:
1496 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1498 * this indicates that the skb we have been
1499 * handed has the 32-bit FCS CRC at the end...
1500 * we should react to that by snipping it off
1501 * because it will be recomputed and added
1504 if (skb->len < (iterator._max_length + FCS_LEN))
1507 skb_trim(skb, skb->len - FCS_LEN);
1509 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1510 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1511 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1512 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1515 case IEEE80211_RADIOTAP_TX_FLAGS:
1516 txflags = get_unaligned_le16(iterator.this_arg);
1517 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1518 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1522 * Please update the file
1523 * Documentation/networking/mac80211-injection.txt
1524 * when parsing new fields here.
1532 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1536 * remove the radiotap header
1537 * iterator->_max_length was sanity-checked against
1538 * skb->len by iterator init
1540 skb_pull(skb, iterator._max_length);
1545 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1546 struct net_device *dev)
1548 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1549 struct ieee80211_channel *chan = local->hw.conf.channel;
1550 struct ieee80211_radiotap_header *prthdr =
1551 (struct ieee80211_radiotap_header *)skb->data;
1552 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1553 struct ieee80211_hdr *hdr;
1554 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1559 * Frame injection is not allowed if beaconing is not allowed
1560 * or if we need radar detection. Beaconing is usually not allowed when
1561 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1562 * Passive scan is also used in world regulatory domains where
1563 * your country is not known and as such it should be treated as
1564 * NO TX unless the channel is explicitly allowed in which case
1565 * your current regulatory domain would not have the passive scan
1568 * Since AP mode uses monitor interfaces to inject/TX management
1569 * frames we can make AP mode the exception to this rule once it
1570 * supports radar detection as its implementation can deal with
1571 * radar detection by itself. We can do that later by adding a
1572 * monitor flag interfaces used for AP support.
1574 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1575 IEEE80211_CHAN_PASSIVE_SCAN)))
1578 /* check for not even having the fixed radiotap header part */
1579 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1580 goto fail; /* too short to be possibly valid */
1582 /* is it a header version we can trust to find length from? */
1583 if (unlikely(prthdr->it_version))
1584 goto fail; /* only version 0 is supported */
1586 /* then there must be a radiotap header with a length we can use */
1587 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1589 /* does the skb contain enough to deliver on the alleged length? */
1590 if (unlikely(skb->len < len_rthdr))
1591 goto fail; /* skb too short for claimed rt header extent */
1594 * fix up the pointers accounting for the radiotap
1595 * header still being in there. We are being given
1596 * a precooked IEEE80211 header so no need for
1599 skb_set_mac_header(skb, len_rthdr);
1601 * these are just fixed to the end of the rt area since we
1602 * don't have any better information and at this point, nobody cares
1604 skb_set_network_header(skb, len_rthdr);
1605 skb_set_transport_header(skb, len_rthdr);
1607 if (skb->len < len_rthdr + 2)
1610 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1611 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1613 if (skb->len < len_rthdr + hdrlen)
1617 * Initialize skb->protocol if the injected frame is a data frame
1618 * carrying a rfc1042 header
1620 if (ieee80211_is_data(hdr->frame_control) &&
1621 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1622 u8 *payload = (u8 *)hdr + hdrlen;
1624 if (compare_ether_addr(payload, rfc1042_header) == 0)
1625 skb->protocol = cpu_to_be16((payload[6] << 8) |
1629 memset(info, 0, sizeof(*info));
1631 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1632 IEEE80211_TX_CTL_INJECTED;
1634 /* process and remove the injection radiotap header */
1635 if (!ieee80211_parse_tx_radiotap(skb))
1641 * We process outgoing injected frames that have a local address
1642 * we handle as though they are non-injected frames.
1643 * This code here isn't entirely correct, the local MAC address
1644 * isn't always enough to find the interface to use; for proper
1645 * VLAN/WDS support we will need a different mechanism (which
1646 * likely isn't going to be monitor interfaces).
1648 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1650 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1651 if (!ieee80211_sdata_running(tmp_sdata))
1653 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1654 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1655 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1657 if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) {
1663 ieee80211_xmit(sdata, skb);
1666 return NETDEV_TX_OK;
1670 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1674 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1675 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1676 * @skb: packet to be sent
1677 * @dev: incoming interface
1679 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1680 * not be freed, and caller is responsible for either retrying later or freeing
1683 * This function takes in an Ethernet header and encapsulates it with suitable
1684 * IEEE 802.11 header based on which interface the packet is coming in. The
1685 * encapsulated packet will then be passed to master interface, wlan#.11, for
1686 * transmission (through low-level driver).
1688 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1689 struct net_device *dev)
1691 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1692 struct ieee80211_local *local = sdata->local;
1693 struct ieee80211_tx_info *info;
1694 int ret = NETDEV_TX_BUSY, head_need;
1695 u16 ethertype, hdrlen, meshhdrlen = 0;
1697 struct ieee80211_hdr hdr;
1698 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1699 struct mesh_path __maybe_unused *mppath = NULL;
1700 const u8 *encaps_data;
1701 int encaps_len, skip_header_bytes;
1703 struct sta_info *sta = NULL;
1704 bool wme_sta = false, authorized = false, tdls_auth = false;
1705 struct sk_buff *tmp_skb;
1706 bool tdls_direct = false;
1708 if (unlikely(skb->len < ETH_HLEN)) {
1713 /* convert Ethernet header to proper 802.11 header (based on
1714 * operation mode) */
1715 ethertype = (skb->data[12] << 8) | skb->data[13];
1716 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1718 switch (sdata->vif.type) {
1719 case NL80211_IFTYPE_AP_VLAN:
1721 sta = rcu_dereference(sdata->u.vlan.sta);
1723 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1725 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1726 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1727 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1728 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1730 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1731 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1737 case NL80211_IFTYPE_AP:
1738 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1740 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1741 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1742 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1745 case NL80211_IFTYPE_WDS:
1746 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1748 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1749 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1750 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1751 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1754 #ifdef CONFIG_MAC80211_MESH
1755 case NL80211_IFTYPE_MESH_POINT:
1756 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1757 /* Do not send frames with mesh_ttl == 0 */
1758 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1763 if (!is_multicast_ether_addr(skb->data))
1764 mppath = mpp_path_lookup(skb->data, sdata);
1767 * Use address extension if it is a packet from
1768 * another interface or if we know the destination
1769 * is being proxied by a portal (i.e. portal address
1770 * differs from proxied address)
1772 if (compare_ether_addr(sdata->vif.addr,
1773 skb->data + ETH_ALEN) == 0 &&
1774 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
1775 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1776 skb->data, skb->data + ETH_ALEN);
1778 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1781 int is_mesh_mcast = 1;
1784 if (is_multicast_ether_addr(skb->data))
1785 /* DA TA mSA AE:SA */
1786 mesh_da = skb->data;
1788 static const u8 bcast[ETH_ALEN] =
1789 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1791 /* RA TA mDA mSA AE:DA SA */
1792 mesh_da = mppath->mpp;
1795 /* DA TA mSA AE:SA */
1799 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1800 mesh_da, sdata->vif.addr);
1804 ieee80211_new_mesh_header(&mesh_hdr,
1806 skb->data + ETH_ALEN,
1810 ieee80211_new_mesh_header(&mesh_hdr,
1813 skb->data + ETH_ALEN);
1818 case NL80211_IFTYPE_STATION:
1819 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1820 bool tdls_peer = false;
1823 sta = sta_info_get(sdata, skb->data);
1825 authorized = test_sta_flag(sta,
1826 WLAN_STA_AUTHORIZED);
1827 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1828 tdls_peer = test_sta_flag(sta,
1829 WLAN_STA_TDLS_PEER);
1830 tdls_auth = test_sta_flag(sta,
1831 WLAN_STA_TDLS_PEER_AUTH);
1836 * If the TDLS link is enabled, send everything
1837 * directly. Otherwise, allow TDLS setup frames
1838 * to be transmitted indirectly.
1840 tdls_direct = tdls_peer && (tdls_auth ||
1841 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1842 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1846 /* link during setup - throw out frames to peer */
1853 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1854 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1855 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1857 } else if (sdata->u.mgd.use_4addr &&
1858 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1859 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1860 IEEE80211_FCTL_TODS);
1862 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1863 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1864 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1865 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1868 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1870 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1871 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1872 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1876 case NL80211_IFTYPE_ADHOC:
1878 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1879 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1880 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1889 * There's no need to try to look up the destination
1890 * if it is a multicast address (which can only happen
1893 if (!is_multicast_ether_addr(hdr.addr1)) {
1895 sta = sta_info_get(sdata, hdr.addr1);
1897 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1898 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1903 /* For mesh, the use of the QoS header is mandatory */
1904 if (ieee80211_vif_is_mesh(&sdata->vif))
1907 /* receiver and we are QoS enabled, use a QoS type frame */
1908 if (wme_sta && local->hw.queues >= 4) {
1909 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1914 * Drop unicast frames to unauthorised stations unless they are
1915 * EAPOL frames from the local station.
1917 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1918 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1919 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1920 compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1921 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1922 if (net_ratelimit())
1923 printk(KERN_DEBUG "%s: dropped frame to %pM"
1924 " (unauthorized port)\n", dev->name,
1928 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1935 * If the skb is shared we need to obtain our own copy.
1937 if (skb_shared(skb)) {
1939 skb = skb_clone(skb, GFP_ATOMIC);
1948 hdr.frame_control = fc;
1949 hdr.duration_id = 0;
1952 skip_header_bytes = ETH_HLEN;
1953 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1954 encaps_data = bridge_tunnel_header;
1955 encaps_len = sizeof(bridge_tunnel_header);
1956 skip_header_bytes -= 2;
1957 } else if (ethertype >= 0x600) {
1958 encaps_data = rfc1042_header;
1959 encaps_len = sizeof(rfc1042_header);
1960 skip_header_bytes -= 2;
1966 nh_pos = skb_network_header(skb) - skb->data;
1967 h_pos = skb_transport_header(skb) - skb->data;
1969 skb_pull(skb, skip_header_bytes);
1970 nh_pos -= skip_header_bytes;
1971 h_pos -= skip_header_bytes;
1973 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1976 * So we need to modify the skb header and hence need a copy of
1977 * that. The head_need variable above doesn't, so far, include
1978 * the needed header space that we don't need right away. If we
1979 * can, then we don't reallocate right now but only after the
1980 * frame arrives at the master device (if it does...)
1982 * If we cannot, however, then we will reallocate to include all
1983 * the ever needed space. Also, if we need to reallocate it anyway,
1984 * make it big enough for everything we may ever need.
1987 if (head_need > 0 || skb_cloned(skb)) {
1988 head_need += IEEE80211_ENCRYPT_HEADROOM;
1989 head_need += local->tx_headroom;
1990 head_need = max_t(int, 0, head_need);
1991 if (ieee80211_skb_resize(sdata, skb, head_need, true))
1996 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
1997 nh_pos += encaps_len;
1998 h_pos += encaps_len;
2001 #ifdef CONFIG_MAC80211_MESH
2002 if (meshhdrlen > 0) {
2003 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2004 nh_pos += meshhdrlen;
2005 h_pos += meshhdrlen;
2009 if (ieee80211_is_data_qos(fc)) {
2010 __le16 *qos_control;
2012 qos_control = (__le16*) skb_push(skb, 2);
2013 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2015 * Maybe we could actually set some fields here, for now just
2016 * initialise to zero to indicate no special operation.
2020 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2025 dev->stats.tx_packets++;
2026 dev->stats.tx_bytes += skb->len;
2028 /* Update skb pointers to various headers since this modified frame
2029 * is going to go through Linux networking code that may potentially
2030 * need things like pointer to IP header. */
2031 skb_set_mac_header(skb, 0);
2032 skb_set_network_header(skb, nh_pos);
2033 skb_set_transport_header(skb, h_pos);
2035 info = IEEE80211_SKB_CB(skb);
2036 memset(info, 0, sizeof(*info));
2038 dev->trans_start = jiffies;
2039 ieee80211_xmit(sdata, skb);
2041 return NETDEV_TX_OK;
2044 if (ret == NETDEV_TX_OK)
2052 * ieee80211_clear_tx_pending may not be called in a context where
2053 * it is possible that it packets could come in again.
2055 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2059 for (i = 0; i < local->hw.queues; i++)
2060 skb_queue_purge(&local->pending[i]);
2064 * Returns false if the frame couldn't be transmitted but was queued instead,
2065 * which in this case means re-queued -- take as an indication to stop sending
2066 * more pending frames.
2068 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2069 struct sk_buff *skb)
2071 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2072 struct ieee80211_sub_if_data *sdata;
2073 struct sta_info *sta;
2074 struct ieee80211_hdr *hdr;
2077 sdata = vif_to_sdata(info->control.vif);
2079 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2080 result = ieee80211_tx(sdata, skb, true);
2082 hdr = (struct ieee80211_hdr *)skb->data;
2083 sta = sta_info_get(sdata, hdr->addr1);
2085 result = __ieee80211_tx(local, &skb, sta, true);
2092 * Transmit all pending packets. Called from tasklet.
2094 void ieee80211_tx_pending(unsigned long data)
2096 struct ieee80211_local *local = (struct ieee80211_local *)data;
2097 struct ieee80211_sub_if_data *sdata;
2098 unsigned long flags;
2104 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2105 for (i = 0; i < local->hw.queues; i++) {
2107 * If queue is stopped by something other than due to pending
2108 * frames, or we have no pending frames, proceed to next queue.
2110 if (local->queue_stop_reasons[i] ||
2111 skb_queue_empty(&local->pending[i]))
2114 while (!skb_queue_empty(&local->pending[i])) {
2115 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2116 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2118 if (WARN_ON(!info->control.vif)) {
2123 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2126 txok = ieee80211_tx_pending_skb(local, skb);
2127 spin_lock_irqsave(&local->queue_stop_reason_lock,
2133 if (skb_queue_empty(&local->pending[i]))
2134 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2135 netif_wake_subqueue(sdata->dev, i);
2137 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2142 /* functions for drivers to get certain frames */
2144 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2145 struct sk_buff *skb,
2146 struct beacon_data *beacon)
2150 int i, have_bits = 0, n1, n2;
2152 /* Generate bitmap for TIM only if there are any STAs in power save
2154 if (atomic_read(&bss->num_sta_ps) > 0)
2155 /* in the hope that this is faster than
2156 * checking byte-for-byte */
2157 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2158 IEEE80211_MAX_AID+1);
2160 if (bss->dtim_count == 0)
2161 bss->dtim_count = beacon->dtim_period - 1;
2165 tim = pos = (u8 *) skb_put(skb, 6);
2166 *pos++ = WLAN_EID_TIM;
2168 *pos++ = bss->dtim_count;
2169 *pos++ = beacon->dtim_period;
2171 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2174 bss->dtim_bc_mc = aid0 == 1;
2177 /* Find largest even number N1 so that bits numbered 1 through
2178 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2179 * (N2 + 1) x 8 through 2007 are 0. */
2181 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2188 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2195 /* Bitmap control */
2197 /* Part Virt Bitmap */
2198 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2200 tim[1] = n2 - n1 + 4;
2201 skb_put(skb, n2 - n1);
2203 *pos++ = aid0; /* Bitmap control */
2204 *pos++ = 0; /* Part Virt Bitmap */
2208 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2209 struct ieee80211_vif *vif,
2210 u16 *tim_offset, u16 *tim_length)
2212 struct ieee80211_local *local = hw_to_local(hw);
2213 struct sk_buff *skb = NULL;
2214 struct ieee80211_tx_info *info;
2215 struct ieee80211_sub_if_data *sdata = NULL;
2216 struct ieee80211_if_ap *ap = NULL;
2217 struct beacon_data *beacon;
2218 struct ieee80211_supported_band *sband;
2219 enum ieee80211_band band = local->hw.conf.channel->band;
2220 struct ieee80211_tx_rate_control txrc;
2222 sband = local->hw.wiphy->bands[band];
2226 sdata = vif_to_sdata(vif);
2228 if (!ieee80211_sdata_running(sdata))
2236 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2238 beacon = rcu_dereference(ap->beacon);
2241 * headroom, head length,
2242 * tail length and maximum TIM length
2244 skb = dev_alloc_skb(local->tx_headroom +
2246 beacon->tail_len + 256);
2250 skb_reserve(skb, local->tx_headroom);
2251 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2255 * Not very nice, but we want to allow the driver to call
2256 * ieee80211_beacon_get() as a response to the set_tim()
2257 * callback. That, however, is already invoked under the
2258 * sta_lock to guarantee consistent and race-free update
2259 * of the tim bitmap in mac80211 and the driver.
2261 if (local->tim_in_locked_section) {
2262 ieee80211_beacon_add_tim(ap, skb, beacon);
2264 unsigned long flags;
2266 spin_lock_irqsave(&local->sta_lock, flags);
2267 ieee80211_beacon_add_tim(ap, skb, beacon);
2268 spin_unlock_irqrestore(&local->sta_lock, flags);
2272 *tim_offset = beacon->head_len;
2274 *tim_length = skb->len - beacon->head_len;
2277 memcpy(skb_put(skb, beacon->tail_len),
2278 beacon->tail, beacon->tail_len);
2281 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2282 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2283 struct ieee80211_hdr *hdr;
2284 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2289 skb = skb_copy(presp, GFP_ATOMIC);
2293 hdr = (struct ieee80211_hdr *) skb->data;
2294 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2295 IEEE80211_STYPE_BEACON);
2296 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2297 struct ieee80211_mgmt *mgmt;
2300 #ifdef CONFIG_MAC80211_MESH
2301 if (!sdata->u.mesh.mesh_id_len)
2305 /* headroom, head length, tail length and maximum TIM length */
2306 skb = dev_alloc_skb(local->tx_headroom + 400 +
2307 sdata->u.mesh.ie_len);
2311 skb_reserve(skb, local->hw.extra_tx_headroom);
2312 mgmt = (struct ieee80211_mgmt *)
2313 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2314 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2315 mgmt->frame_control =
2316 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2317 memset(mgmt->da, 0xff, ETH_ALEN);
2318 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2319 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2320 mgmt->u.beacon.beacon_int =
2321 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2322 mgmt->u.beacon.capab_info |= cpu_to_le16(
2323 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
2325 pos = skb_put(skb, 2);
2326 *pos++ = WLAN_EID_SSID;
2329 if (ieee80211_add_srates_ie(&sdata->vif, skb) ||
2330 mesh_add_ds_params_ie(skb, sdata) ||
2331 ieee80211_add_ext_srates_ie(&sdata->vif, skb) ||
2332 mesh_add_rsn_ie(skb, sdata) ||
2333 mesh_add_meshid_ie(skb, sdata) ||
2334 mesh_add_meshconf_ie(skb, sdata) ||
2335 mesh_add_vendor_ies(skb, sdata)) {
2336 pr_err("o11s: couldn't add ies!\n");
2344 info = IEEE80211_SKB_CB(skb);
2346 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2347 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2350 memset(&txrc, 0, sizeof(txrc));
2353 txrc.bss_conf = &sdata->vif.bss_conf;
2355 txrc.reported_rate.idx = -1;
2356 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2357 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2358 txrc.max_rate_idx = -1;
2360 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2362 rate_control_get_rate(sdata, NULL, &txrc);
2364 info->control.vif = vif;
2366 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2367 IEEE80211_TX_CTL_ASSIGN_SEQ |
2368 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2373 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2375 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2376 struct ieee80211_vif *vif)
2378 struct ieee80211_sub_if_data *sdata;
2379 struct ieee80211_if_managed *ifmgd;
2380 struct ieee80211_pspoll *pspoll;
2381 struct ieee80211_local *local;
2382 struct sk_buff *skb;
2384 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2387 sdata = vif_to_sdata(vif);
2388 ifmgd = &sdata->u.mgd;
2389 local = sdata->local;
2391 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2395 skb_reserve(skb, local->hw.extra_tx_headroom);
2397 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2398 memset(pspoll, 0, sizeof(*pspoll));
2399 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2400 IEEE80211_STYPE_PSPOLL);
2401 pspoll->aid = cpu_to_le16(ifmgd->aid);
2403 /* aid in PS-Poll has its two MSBs each set to 1 */
2404 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2406 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2407 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2411 EXPORT_SYMBOL(ieee80211_pspoll_get);
2413 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2414 struct ieee80211_vif *vif)
2416 struct ieee80211_hdr_3addr *nullfunc;
2417 struct ieee80211_sub_if_data *sdata;
2418 struct ieee80211_if_managed *ifmgd;
2419 struct ieee80211_local *local;
2420 struct sk_buff *skb;
2422 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2425 sdata = vif_to_sdata(vif);
2426 ifmgd = &sdata->u.mgd;
2427 local = sdata->local;
2429 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2433 skb_reserve(skb, local->hw.extra_tx_headroom);
2435 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2437 memset(nullfunc, 0, sizeof(*nullfunc));
2438 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2439 IEEE80211_STYPE_NULLFUNC |
2440 IEEE80211_FCTL_TODS);
2441 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2442 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2443 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2447 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2449 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2450 struct ieee80211_vif *vif,
2451 const u8 *ssid, size_t ssid_len,
2452 const u8 *ie, size_t ie_len)
2454 struct ieee80211_sub_if_data *sdata;
2455 struct ieee80211_local *local;
2456 struct ieee80211_hdr_3addr *hdr;
2457 struct sk_buff *skb;
2461 sdata = vif_to_sdata(vif);
2462 local = sdata->local;
2463 ie_ssid_len = 2 + ssid_len;
2465 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2466 ie_ssid_len + ie_len);
2470 skb_reserve(skb, local->hw.extra_tx_headroom);
2472 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2473 memset(hdr, 0, sizeof(*hdr));
2474 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2475 IEEE80211_STYPE_PROBE_REQ);
2476 memset(hdr->addr1, 0xff, ETH_ALEN);
2477 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2478 memset(hdr->addr3, 0xff, ETH_ALEN);
2480 pos = skb_put(skb, ie_ssid_len);
2481 *pos++ = WLAN_EID_SSID;
2484 memcpy(pos, ssid, ssid_len);
2488 pos = skb_put(skb, ie_len);
2489 memcpy(pos, ie, ie_len);
2494 EXPORT_SYMBOL(ieee80211_probereq_get);
2496 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2497 const void *frame, size_t frame_len,
2498 const struct ieee80211_tx_info *frame_txctl,
2499 struct ieee80211_rts *rts)
2501 const struct ieee80211_hdr *hdr = frame;
2503 rts->frame_control =
2504 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2505 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2507 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2508 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2510 EXPORT_SYMBOL(ieee80211_rts_get);
2512 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2513 const void *frame, size_t frame_len,
2514 const struct ieee80211_tx_info *frame_txctl,
2515 struct ieee80211_cts *cts)
2517 const struct ieee80211_hdr *hdr = frame;
2519 cts->frame_control =
2520 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2521 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2522 frame_len, frame_txctl);
2523 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2525 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2528 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2529 struct ieee80211_vif *vif)
2531 struct ieee80211_local *local = hw_to_local(hw);
2532 struct sk_buff *skb = NULL;
2533 struct ieee80211_tx_data tx;
2534 struct ieee80211_sub_if_data *sdata;
2535 struct ieee80211_if_ap *bss = NULL;
2536 struct beacon_data *beacon;
2537 struct ieee80211_tx_info *info;
2539 sdata = vif_to_sdata(vif);
2543 beacon = rcu_dereference(bss->beacon);
2545 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2548 if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2549 goto out; /* send buffered bc/mc only after DTIM beacon */
2552 skb = skb_dequeue(&bss->ps_bc_buf);
2555 local->total_ps_buffered--;
2557 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2558 struct ieee80211_hdr *hdr =
2559 (struct ieee80211_hdr *) skb->data;
2560 /* more buffered multicast/broadcast frames ==> set
2561 * MoreData flag in IEEE 802.11 header to inform PS
2563 hdr->frame_control |=
2564 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2567 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2569 dev_kfree_skb_any(skb);
2572 info = IEEE80211_SKB_CB(skb);
2574 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2575 tx.channel = local->hw.conf.channel;
2576 info->band = tx.channel->band;
2578 if (invoke_tx_handlers(&tx))
2585 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2587 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
2589 skb_set_mac_header(skb, 0);
2590 skb_set_network_header(skb, 0);
2591 skb_set_transport_header(skb, 0);
2593 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
2594 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
2598 * The other path calling ieee80211_xmit is from the tasklet,
2599 * and while we can handle concurrent transmissions locking
2600 * requirements are that we do not come into tx with bhs on.
2603 ieee80211_xmit(sdata, skb);