2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <linux/export.h>
22 #include <net/net_namespace.h>
23 #include <net/ieee80211_radiotap.h>
24 #include <net/cfg80211.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
39 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
40 struct sk_buff *skb, int group_addr,
43 int rate, mrate, erp, dur, i;
44 struct ieee80211_rate *txrate;
45 struct ieee80211_local *local = tx->local;
46 struct ieee80211_supported_band *sband;
47 struct ieee80211_hdr *hdr;
48 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
50 /* assume HW handles this */
51 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
55 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
58 sband = local->hw.wiphy->bands[tx->channel->band];
59 txrate = &sband->bitrates[info->control.rates[0].idx];
61 erp = txrate->flags & IEEE80211_RATE_ERP_G;
64 * data and mgmt (except PS Poll):
66 * - during contention period:
67 * if addr1 is group address: 0
68 * if more fragments = 0 and addr1 is individual address: time to
69 * transmit one ACK plus SIFS
70 * if more fragments = 1 and addr1 is individual address: time to
71 * transmit next fragment plus 2 x ACK plus 3 x SIFS
74 * - control response frame (CTS or ACK) shall be transmitted using the
75 * same rate as the immediately previous frame in the frame exchange
76 * sequence, if this rate belongs to the PHY mandatory rates, or else
77 * at the highest possible rate belonging to the PHY rates in the
80 hdr = (struct ieee80211_hdr *)skb->data;
81 if (ieee80211_is_ctl(hdr->frame_control)) {
82 /* TODO: These control frames are not currently sent by
83 * mac80211, but should they be implemented, this function
84 * needs to be updated to support duration field calculation.
86 * RTS: time needed to transmit pending data/mgmt frame plus
87 * one CTS frame plus one ACK frame plus 3 x SIFS
88 * CTS: duration of immediately previous RTS minus time
89 * required to transmit CTS and its SIFS
90 * ACK: 0 if immediately previous directed data/mgmt had
91 * more=0, with more=1 duration in ACK frame is duration
92 * from previous frame minus time needed to transmit ACK
94 * PS Poll: BIT(15) | BIT(14) | aid
100 if (0 /* FIX: data/mgmt during CFP */)
101 return cpu_to_le16(32768);
103 if (group_addr) /* Group address as the destination - no ACK */
106 /* Individual destination address:
107 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
108 * CTS and ACK frames shall be transmitted using the highest rate in
109 * basic rate set that is less than or equal to the rate of the
110 * immediately previous frame and that is using the same modulation
111 * (CCK or OFDM). If no basic rate set matches with these requirements,
112 * the highest mandatory rate of the PHY that is less than or equal to
113 * the rate of the previous frame is used.
114 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
117 /* use lowest available if everything fails */
118 mrate = sband->bitrates[0].bitrate;
119 for (i = 0; i < sband->n_bitrates; i++) {
120 struct ieee80211_rate *r = &sband->bitrates[i];
122 if (r->bitrate > txrate->bitrate)
125 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
128 switch (sband->band) {
129 case IEEE80211_BAND_2GHZ: {
131 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
132 flag = IEEE80211_RATE_MANDATORY_G;
134 flag = IEEE80211_RATE_MANDATORY_B;
139 case IEEE80211_BAND_5GHZ:
140 if (r->flags & IEEE80211_RATE_MANDATORY_A)
143 case IEEE80211_NUM_BANDS:
149 /* No matching basic rate found; use highest suitable mandatory
154 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
155 if (ieee80211_is_data_qos(hdr->frame_control) &&
156 *(ieee80211_get_qos_ctl(hdr)) | IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
159 /* Time needed to transmit ACK
160 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
161 * to closest integer */
162 dur = ieee80211_frame_duration(local, 10, rate, erp,
163 tx->sdata->vif.bss_conf.use_short_preamble);
166 /* Frame is fragmented: duration increases with time needed to
167 * transmit next fragment plus ACK and 2 x SIFS. */
168 dur *= 2; /* ACK + SIFS */
170 dur += ieee80211_frame_duration(local, next_frag_len,
171 txrate->bitrate, erp,
172 tx->sdata->vif.bss_conf.use_short_preamble);
175 return cpu_to_le16(dur);
178 static inline int is_ieee80211_device(struct ieee80211_local *local,
179 struct net_device *dev)
181 return local == wdev_priv(dev->ieee80211_ptr);
185 static ieee80211_tx_result debug_noinline
186 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
188 struct ieee80211_local *local = tx->local;
189 struct ieee80211_if_managed *ifmgd;
191 /* driver doesn't support power save */
192 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
195 /* hardware does dynamic power save */
196 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
199 /* dynamic power save disabled */
200 if (local->hw.conf.dynamic_ps_timeout <= 0)
203 /* we are scanning, don't enable power save */
207 if (!local->ps_sdata)
210 /* No point if we're going to suspend */
211 if (local->quiescing)
214 /* dynamic ps is supported only in managed mode */
215 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
218 ifmgd = &tx->sdata->u.mgd;
221 * Don't wakeup from power save if u-apsd is enabled, voip ac has
222 * u-apsd enabled and the frame is in voip class. This effectively
223 * means that even if all access categories have u-apsd enabled, in
224 * practise u-apsd is only used with the voip ac. This is a
225 * workaround for the case when received voip class packets do not
226 * have correct qos tag for some reason, due the network or the
229 * Note: local->uapsd_queues access is racy here. If the value is
230 * changed via debugfs, user needs to reassociate manually to have
231 * everything in sync.
233 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
234 && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
235 && skb_get_queue_mapping(tx->skb) == 0)
238 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
239 ieee80211_stop_queues_by_reason(&local->hw,
240 IEEE80211_QUEUE_STOP_REASON_PS);
241 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
242 ieee80211_queue_work(&local->hw,
243 &local->dynamic_ps_disable_work);
246 /* Don't restart the timer if we're not disassociated */
247 if (!ifmgd->associated)
250 mod_timer(&local->dynamic_ps_timer, jiffies +
251 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
256 static ieee80211_tx_result debug_noinline
257 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
260 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
261 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
264 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
267 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
268 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
269 !ieee80211_is_probe_req(hdr->frame_control) &&
270 !ieee80211_is_nullfunc(hdr->frame_control))
272 * When software scanning only nullfunc frames (to notify
273 * the sleep state to the AP) and probe requests (for the
274 * active scan) are allowed, all other frames should not be
275 * sent and we should not get here, but if we do
276 * nonetheless, drop them to avoid sending them
277 * off-channel. See the link below and
278 * ieee80211_start_scan() for more.
280 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
284 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
287 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
290 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
294 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
296 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
297 if (unlikely(!assoc &&
298 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
299 ieee80211_is_data(hdr->frame_control))) {
300 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
301 printk(KERN_DEBUG "%s: dropped data frame to not "
302 "associated station %pM\n",
303 tx->sdata->name, hdr->addr1);
304 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
305 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
309 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
310 tx->local->num_sta == 0 &&
311 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
313 * No associated STAs - no need to send multicast
324 /* This function is called whenever the AP is about to exceed the maximum limit
325 * of buffered frames for power saving STAs. This situation should not really
326 * happen often during normal operation, so dropping the oldest buffered packet
327 * from each queue should be OK to make some room for new frames. */
328 static void purge_old_ps_buffers(struct ieee80211_local *local)
330 int total = 0, purged = 0;
332 struct ieee80211_sub_if_data *sdata;
333 struct sta_info *sta;
336 * virtual interfaces are protected by RCU
340 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
341 struct ieee80211_if_ap *ap;
342 if (sdata->vif.type != NL80211_IFTYPE_AP)
345 skb = skb_dequeue(&ap->ps_bc_buf);
350 total += skb_queue_len(&ap->ps_bc_buf);
354 * Drop one frame from each station from the lowest-priority
355 * AC that has frames at all.
357 list_for_each_entry_rcu(sta, &local->sta_list, list) {
360 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
361 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
362 total += skb_queue_len(&sta->ps_tx_buf[ac]);
373 local->total_ps_buffered = total;
374 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
375 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
380 static ieee80211_tx_result
381 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
383 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
384 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
387 * broadcast/multicast frame
389 * If any of the associated stations is in power save mode,
390 * the frame is buffered to be sent after DTIM beacon frame.
391 * This is done either by the hardware or us.
394 /* powersaving STAs only in AP/VLAN mode */
398 /* no buffering for ordered frames */
399 if (ieee80211_has_order(hdr->frame_control))
402 /* no stations in PS mode */
403 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
406 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
408 /* device releases frame after DTIM beacon */
409 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
412 /* buffered in mac80211 */
413 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
414 purge_old_ps_buffers(tx->local);
416 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
417 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
419 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
422 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
424 tx->local->total_ps_buffered++;
426 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
431 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
434 if (!ieee80211_is_mgmt(fc))
437 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
440 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
447 static ieee80211_tx_result
448 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
450 struct sta_info *sta = tx->sta;
451 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
452 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
453 struct ieee80211_local *local = tx->local;
456 ieee80211_is_probe_resp(hdr->frame_control) ||
457 ieee80211_is_auth(hdr->frame_control) ||
458 ieee80211_is_assoc_resp(hdr->frame_control) ||
459 ieee80211_is_reassoc_resp(hdr->frame_control)))
462 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
463 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
464 !(info->flags & IEEE80211_TX_CTL_POLL_RESPONSE))) {
465 int ac = skb_get_queue_mapping(tx->skb);
467 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
468 printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n",
469 sta->sta.addr, sta->sta.aid, ac);
470 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
471 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
472 purge_old_ps_buffers(tx->local);
473 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
474 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
475 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
477 printk(KERN_DEBUG "%s: STA %pM TX buffer for "
478 "AC %d full - dropping oldest frame\n",
479 tx->sdata->name, sta->sta.addr, ac);
483 tx->local->total_ps_buffered++;
485 info->control.jiffies = jiffies;
486 info->control.vif = &tx->sdata->vif;
487 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
488 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
490 if (!timer_pending(&local->sta_cleanup))
491 mod_timer(&local->sta_cleanup,
492 round_jiffies(jiffies +
493 STA_INFO_CLEANUP_INTERVAL));
496 * We queued up some frames, so the TIM bit might
497 * need to be set, recalculate it.
499 sta_info_recalc_tim(sta);
503 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
504 else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
506 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
507 tx->sdata->name, sta->sta.addr);
509 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
514 static ieee80211_tx_result debug_noinline
515 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
517 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
520 if (tx->flags & IEEE80211_TX_UNICAST)
521 return ieee80211_tx_h_unicast_ps_buf(tx);
523 return ieee80211_tx_h_multicast_ps_buf(tx);
526 static ieee80211_tx_result debug_noinline
527 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
529 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
531 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
532 tx->sdata->control_port_no_encrypt))
533 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
538 static ieee80211_tx_result debug_noinline
539 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
541 struct ieee80211_key *key = NULL;
542 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
543 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
545 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
547 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
549 else if (ieee80211_is_mgmt(hdr->frame_control) &&
550 is_multicast_ether_addr(hdr->addr1) &&
551 ieee80211_is_robust_mgmt_frame(hdr) &&
552 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
554 else if (is_multicast_ether_addr(hdr->addr1) &&
555 (key = rcu_dereference(tx->sdata->default_multicast_key)))
557 else if (!is_multicast_ether_addr(hdr->addr1) &&
558 (key = rcu_dereference(tx->sdata->default_unicast_key)))
560 else if (tx->sdata->drop_unencrypted &&
561 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
562 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
563 (!ieee80211_is_robust_mgmt_frame(hdr) ||
564 (ieee80211_is_action(hdr->frame_control) &&
565 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) {
566 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
572 bool skip_hw = false;
574 tx->key->tx_rx_count++;
575 /* TODO: add threshold stuff again */
577 switch (tx->key->conf.cipher) {
578 case WLAN_CIPHER_SUITE_WEP40:
579 case WLAN_CIPHER_SUITE_WEP104:
580 case WLAN_CIPHER_SUITE_TKIP:
581 if (!ieee80211_is_data_present(hdr->frame_control))
584 case WLAN_CIPHER_SUITE_CCMP:
585 if (!ieee80211_is_data_present(hdr->frame_control) &&
586 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
590 skip_hw = (tx->key->conf.flags &
591 IEEE80211_KEY_FLAG_SW_MGMT) &&
592 ieee80211_is_mgmt(hdr->frame_control);
594 case WLAN_CIPHER_SUITE_AES_CMAC:
595 if (!ieee80211_is_mgmt(hdr->frame_control))
600 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
603 if (!skip_hw && tx->key &&
604 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
605 info->control.hw_key = &tx->key->conf;
611 static ieee80211_tx_result debug_noinline
612 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
614 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
615 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
616 struct ieee80211_supported_band *sband;
617 struct ieee80211_rate *rate;
620 bool inval = false, rts = false, short_preamble = false;
621 struct ieee80211_tx_rate_control txrc;
624 memset(&txrc, 0, sizeof(txrc));
626 sband = tx->local->hw.wiphy->bands[tx->channel->band];
628 len = min_t(u32, tx->skb->len + FCS_LEN,
629 tx->local->hw.wiphy->frag_threshold);
631 /* set up the tx rate control struct we give the RC algo */
632 txrc.hw = local_to_hw(tx->local);
634 txrc.bss_conf = &tx->sdata->vif.bss_conf;
636 txrc.reported_rate.idx = -1;
637 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
638 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
639 txrc.max_rate_idx = -1;
641 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
642 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
643 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
644 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
646 /* set up RTS protection if desired */
647 if (len > tx->local->hw.wiphy->rts_threshold) {
648 txrc.rts = rts = true;
652 * Use short preamble if the BSS can handle it, but not for
653 * management frames unless we know the receiver can handle
654 * that -- the management frame might be to a station that
655 * just wants a probe response.
657 if (tx->sdata->vif.bss_conf.use_short_preamble &&
658 (ieee80211_is_data(hdr->frame_control) ||
659 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
660 txrc.short_preamble = short_preamble = true;
663 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
666 * Lets not bother rate control if we're associated and cannot
667 * talk to the sta. This should not happen.
669 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
670 !rate_usable_index_exists(sband, &tx->sta->sta),
671 "%s: Dropped data frame as no usable bitrate found while "
672 "scanning and associated. Target station: "
673 "%pM on %d GHz band\n",
674 tx->sdata->name, hdr->addr1,
675 tx->channel->band ? 5 : 2))
679 * If we're associated with the sta at this point we know we can at
680 * least send the frame at the lowest bit rate.
682 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
684 if (unlikely(info->control.rates[0].idx < 0))
687 if (txrc.reported_rate.idx < 0) {
688 txrc.reported_rate = info->control.rates[0];
689 if (tx->sta && ieee80211_is_data(hdr->frame_control))
690 tx->sta->last_tx_rate = txrc.reported_rate;
692 tx->sta->last_tx_rate = txrc.reported_rate;
694 if (unlikely(!info->control.rates[0].count))
695 info->control.rates[0].count = 1;
697 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
698 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
699 info->control.rates[0].count = 1;
701 if (is_multicast_ether_addr(hdr->addr1)) {
703 * XXX: verify the rate is in the basic rateset
709 * set up the RTS/CTS rate as the fastest basic rate
710 * that is not faster than the data rate
712 * XXX: Should this check all retry rates?
714 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
717 rate = &sband->bitrates[info->control.rates[0].idx];
719 for (i = 0; i < sband->n_bitrates; i++) {
720 /* must be a basic rate */
721 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
723 /* must not be faster than the data rate */
724 if (sband->bitrates[i].bitrate > rate->bitrate)
727 if (sband->bitrates[baserate].bitrate <
728 sband->bitrates[i].bitrate)
732 info->control.rts_cts_rate_idx = baserate;
735 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
737 * make sure there's no valid rate following
738 * an invalid one, just in case drivers don't
739 * take the API seriously to stop at -1.
742 info->control.rates[i].idx = -1;
745 if (info->control.rates[i].idx < 0) {
751 * For now assume MCS is already set up correctly, this
754 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
755 WARN_ON(info->control.rates[i].idx > 76);
759 /* set up RTS protection if desired */
761 info->control.rates[i].flags |=
762 IEEE80211_TX_RC_USE_RTS_CTS;
765 if (WARN_ON_ONCE(info->control.rates[i].idx >=
766 sband->n_bitrates)) {
767 info->control.rates[i].idx = -1;
771 rate = &sband->bitrates[info->control.rates[i].idx];
773 /* set up short preamble */
774 if (short_preamble &&
775 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
776 info->control.rates[i].flags |=
777 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
779 /* set up G protection */
780 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
781 rate->flags & IEEE80211_RATE_ERP_G)
782 info->control.rates[i].flags |=
783 IEEE80211_TX_RC_USE_CTS_PROTECT;
789 static ieee80211_tx_result debug_noinline
790 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
792 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
793 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
799 * Packet injection may want to control the sequence
800 * number, if we have no matching interface then we
801 * neither assign one ourselves nor ask the driver to.
803 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
806 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
809 if (ieee80211_hdrlen(hdr->frame_control) < 24)
812 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
816 * Anything but QoS data that has a sequence number field
817 * (is long enough) gets a sequence number from the global
820 if (!ieee80211_is_data_qos(hdr->frame_control)) {
821 /* driver should assign sequence number */
822 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
823 /* for pure STA mode without beacons, we can do it */
824 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
825 tx->sdata->sequence_number += 0x10;
830 * This should be true for injected/management frames only, for
831 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
832 * above since they are not QoS-data frames.
837 /* include per-STA, per-TID sequence counter */
839 qc = ieee80211_get_qos_ctl(hdr);
840 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
841 seq = &tx->sta->tid_seq[tid];
843 hdr->seq_ctrl = cpu_to_le16(*seq);
845 /* Increase the sequence number. */
846 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
851 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
852 struct sk_buff *skb, int hdrlen,
855 struct ieee80211_local *local = tx->local;
856 struct ieee80211_tx_info *info;
858 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
859 int pos = hdrlen + per_fragm;
860 int rem = skb->len - hdrlen - per_fragm;
862 if (WARN_ON(rem < 0))
865 /* first fragment was already added to queue by caller */
868 int fraglen = per_fragm;
873 tmp = dev_alloc_skb(local->tx_headroom +
875 IEEE80211_ENCRYPT_HEADROOM +
876 IEEE80211_ENCRYPT_TAILROOM);
880 __skb_queue_tail(&tx->skbs, tmp);
882 skb_reserve(tmp, local->tx_headroom +
883 IEEE80211_ENCRYPT_HEADROOM);
884 /* copy control information */
885 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
887 info = IEEE80211_SKB_CB(tmp);
888 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
889 IEEE80211_TX_CTL_FIRST_FRAGMENT);
892 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
894 skb_copy_queue_mapping(tmp, skb);
895 tmp->priority = skb->priority;
898 /* copy header and data */
899 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
900 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
905 /* adjust first fragment's length */
906 skb->len = hdrlen + per_fragm;
910 static ieee80211_tx_result debug_noinline
911 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
913 struct sk_buff *skb = tx->skb;
914 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
915 struct ieee80211_hdr *hdr = (void *)skb->data;
916 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
920 /* no matter what happens, tx->skb moves to tx->skbs */
921 __skb_queue_tail(&tx->skbs, skb);
924 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
927 if (tx->local->ops->set_frag_threshold)
931 * Warn when submitting a fragmented A-MPDU frame and drop it.
932 * This scenario is handled in ieee80211_tx_prepare but extra
933 * caution taken here as fragmented ampdu may cause Tx stop.
935 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
938 hdrlen = ieee80211_hdrlen(hdr->frame_control);
940 /* internal error, why isn't DONTFRAG set? */
941 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
945 * Now fragment the frame. This will allocate all the fragments and
946 * chain them (using skb as the first fragment) to skb->next.
947 * During transmission, we will remove the successfully transmitted
948 * fragments from this list. When the low-level driver rejects one
949 * of the fragments then we will simply pretend to accept the skb
950 * but store it away as pending.
952 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
955 /* update duration/seq/flags of fragments */
958 skb_queue_walk(&tx->skbs, skb) {
960 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
962 hdr = (void *)skb->data;
963 info = IEEE80211_SKB_CB(skb);
965 if (!skb_queue_is_last(&tx->skbs, skb)) {
966 hdr->frame_control |= morefrags;
968 * No multi-rate retries for fragmented frames, that
969 * would completely throw off the NAV at other STAs.
971 info->control.rates[1].idx = -1;
972 info->control.rates[2].idx = -1;
973 info->control.rates[3].idx = -1;
974 info->control.rates[4].idx = -1;
975 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
976 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
978 hdr->frame_control &= ~morefrags;
981 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
988 static ieee80211_tx_result debug_noinline
989 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
996 tx->sta->tx_packets++;
997 skb_queue_walk(&tx->skbs, skb) {
998 tx->sta->tx_fragments++;
999 tx->sta->tx_bytes += skb->len;
1005 static ieee80211_tx_result debug_noinline
1006 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1008 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1013 switch (tx->key->conf.cipher) {
1014 case WLAN_CIPHER_SUITE_WEP40:
1015 case WLAN_CIPHER_SUITE_WEP104:
1016 return ieee80211_crypto_wep_encrypt(tx);
1017 case WLAN_CIPHER_SUITE_TKIP:
1018 return ieee80211_crypto_tkip_encrypt(tx);
1019 case WLAN_CIPHER_SUITE_CCMP:
1020 return ieee80211_crypto_ccmp_encrypt(tx);
1021 case WLAN_CIPHER_SUITE_AES_CMAC:
1022 return ieee80211_crypto_aes_cmac_encrypt(tx);
1024 /* handle hw-only algorithm */
1025 if (info->control.hw_key) {
1026 ieee80211_tx_set_protected(tx);
1036 static ieee80211_tx_result debug_noinline
1037 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1039 struct sk_buff *skb;
1040 struct ieee80211_hdr *hdr;
1044 skb_queue_walk(&tx->skbs, skb) {
1045 hdr = (void *) skb->data;
1046 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1047 break; /* must not overwrite AID */
1048 if (!skb_queue_is_last(&tx->skbs, skb)) {
1049 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1050 next_len = next->len;
1053 group_addr = is_multicast_ether_addr(hdr->addr1);
1056 ieee80211_duration(tx, skb, group_addr, next_len);
1062 /* actual transmit path */
1064 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1065 struct sk_buff *skb,
1066 struct ieee80211_tx_info *info,
1067 struct tid_ampdu_tx *tid_tx,
1070 bool queued = false;
1071 bool reset_agg_timer = false;
1073 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1074 info->flags |= IEEE80211_TX_CTL_AMPDU;
1075 reset_agg_timer = true;
1076 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1078 * nothing -- this aggregation session is being started
1079 * but that might still fail with the driver
1082 spin_lock(&tx->sta->lock);
1084 * Need to re-check now, because we may get here
1086 * 1) in the window during which the setup is actually
1087 * already done, but not marked yet because not all
1088 * packets are spliced over to the driver pending
1089 * queue yet -- if this happened we acquire the lock
1090 * either before or after the splice happens, but
1091 * need to recheck which of these cases happened.
1093 * 2) during session teardown, if the OPERATIONAL bit
1094 * was cleared due to the teardown but the pointer
1095 * hasn't been assigned NULL yet (or we loaded it
1096 * before it was assigned) -- in this case it may
1097 * now be NULL which means we should just let the
1098 * packet pass through because splicing the frames
1099 * back is already done.
1101 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1104 /* do nothing, let packet pass through */
1105 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1106 info->flags |= IEEE80211_TX_CTL_AMPDU;
1107 reset_agg_timer = true;
1110 info->control.vif = &tx->sdata->vif;
1111 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1112 __skb_queue_tail(&tid_tx->pending, skb);
1114 spin_unlock(&tx->sta->lock);
1117 /* reset session timer */
1118 if (reset_agg_timer && tid_tx->timeout)
1119 mod_timer(&tid_tx->session_timer,
1120 TU_TO_EXP_TIME(tid_tx->timeout));
1128 static ieee80211_tx_result
1129 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1130 struct ieee80211_tx_data *tx,
1131 struct sk_buff *skb)
1133 struct ieee80211_local *local = sdata->local;
1134 struct ieee80211_hdr *hdr;
1135 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1139 memset(tx, 0, sizeof(*tx));
1143 tx->channel = local->hw.conf.channel;
1144 __skb_queue_head_init(&tx->skbs);
1147 * If this flag is set to true anywhere, and we get here,
1148 * we are doing the needed processing, so remove the flag
1151 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1153 hdr = (struct ieee80211_hdr *) skb->data;
1155 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1156 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1157 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1159 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
1160 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1163 tx->sta = sta_info_get(sdata, hdr->addr1);
1165 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1166 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1167 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1168 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1169 struct tid_ampdu_tx *tid_tx;
1171 qc = ieee80211_get_qos_ctl(hdr);
1172 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1174 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1178 queued = ieee80211_tx_prep_agg(tx, skb, info,
1181 if (unlikely(queued))
1186 if (is_multicast_ether_addr(hdr->addr1)) {
1187 tx->flags &= ~IEEE80211_TX_UNICAST;
1188 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1190 tx->flags |= IEEE80211_TX_UNICAST;
1192 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1193 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1194 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1195 info->flags & IEEE80211_TX_CTL_AMPDU)
1196 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1200 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1201 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1202 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1204 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1209 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1210 struct ieee80211_vif *vif,
1211 struct ieee80211_sta *sta,
1212 struct sk_buff_head *skbs,
1215 struct sk_buff *skb, *tmp;
1216 struct ieee80211_tx_info *info;
1217 unsigned long flags;
1219 skb_queue_walk_safe(skbs, skb, tmp) {
1220 int q = skb_get_queue_mapping(skb);
1222 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1223 if (local->queue_stop_reasons[q] ||
1224 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1226 * Since queue is stopped, queue up frames for later
1227 * transmission from the tx-pending tasklet when the
1228 * queue is woken again.
1231 skb_queue_splice_init(skbs, &local->pending[q]);
1233 skb_queue_splice_tail_init(skbs,
1234 &local->pending[q]);
1236 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1240 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1242 info = IEEE80211_SKB_CB(skb);
1243 info->control.vif = vif;
1244 info->control.sta = sta;
1246 __skb_unlink(skb, skbs);
1254 * Returns false if the frame couldn't be transmitted but was queued instead.
1256 static bool __ieee80211_tx(struct ieee80211_local *local,
1257 struct sk_buff_head *skbs, int led_len,
1258 struct sta_info *sta, bool txpending)
1260 struct ieee80211_tx_info *info;
1261 struct ieee80211_sub_if_data *sdata;
1262 struct ieee80211_vif *vif;
1263 struct ieee80211_sta *pubsta;
1264 struct sk_buff *skb;
1268 if (WARN_ON(skb_queue_empty(skbs)))
1271 skb = skb_peek(skbs);
1272 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1273 info = IEEE80211_SKB_CB(skb);
1274 sdata = vif_to_sdata(info->control.vif);
1275 if (sta && !sta->uploaded)
1283 switch (sdata->vif.type) {
1284 case NL80211_IFTYPE_MONITOR:
1288 case NL80211_IFTYPE_AP_VLAN:
1289 sdata = container_of(sdata->bss,
1290 struct ieee80211_sub_if_data, u.ap);
1297 if (local->ops->tx_frags)
1298 drv_tx_frags(local, vif, pubsta, skbs);
1300 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1303 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1304 ieee80211_led_tx(local, 1);
1306 WARN_ON_ONCE(!skb_queue_empty(skbs));
1312 * Invoke TX handlers, return 0 on success and non-zero if the
1313 * frame was dropped or queued.
1315 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1317 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1318 ieee80211_tx_result res = TX_DROP;
1320 #define CALL_TXH(txh) \
1323 if (res != TX_CONTINUE) \
1327 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1328 CALL_TXH(ieee80211_tx_h_check_assoc);
1329 CALL_TXH(ieee80211_tx_h_ps_buf);
1330 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1331 CALL_TXH(ieee80211_tx_h_select_key);
1332 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1333 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1335 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1336 __skb_queue_tail(&tx->skbs, tx->skb);
1341 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1342 CALL_TXH(ieee80211_tx_h_sequence);
1343 CALL_TXH(ieee80211_tx_h_fragment);
1344 /* handlers after fragment must be aware of tx info fragmentation! */
1345 CALL_TXH(ieee80211_tx_h_stats);
1346 CALL_TXH(ieee80211_tx_h_encrypt);
1347 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1348 CALL_TXH(ieee80211_tx_h_calculate_duration);
1352 if (unlikely(res == TX_DROP)) {
1353 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1355 dev_kfree_skb(tx->skb);
1357 __skb_queue_purge(&tx->skbs);
1359 } else if (unlikely(res == TX_QUEUED)) {
1360 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1368 * Returns false if the frame couldn't be transmitted but was queued instead.
1370 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1371 struct sk_buff *skb, bool txpending)
1373 struct ieee80211_local *local = sdata->local;
1374 struct ieee80211_tx_data tx;
1375 ieee80211_tx_result res_prepare;
1376 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1380 if (unlikely(skb->len < 10)) {
1387 /* initialises tx */
1389 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1391 if (unlikely(res_prepare == TX_DROP)) {
1394 } else if (unlikely(res_prepare == TX_QUEUED)) {
1398 tx.channel = local->hw.conf.channel;
1399 info->band = tx.channel->band;
1401 if (!invoke_tx_handlers(&tx))
1402 result = __ieee80211_tx(local, &tx.skbs, led_len,
1409 /* device xmit handlers */
1411 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1412 struct sk_buff *skb,
1413 int head_need, bool may_encrypt)
1415 struct ieee80211_local *local = sdata->local;
1418 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1419 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1420 tail_need -= skb_tailroom(skb);
1421 tail_need = max_t(int, tail_need, 0);
1424 if (skb_cloned(skb))
1425 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1426 else if (head_need || tail_need)
1427 I802_DEBUG_INC(local->tx_expand_skb_head);
1431 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1432 wiphy_debug(local->hw.wiphy,
1433 "failed to reallocate TX buffer\n");
1440 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1442 struct ieee80211_local *local = sdata->local;
1443 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1444 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1450 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1452 headroom = local->tx_headroom;
1454 headroom += IEEE80211_ENCRYPT_HEADROOM;
1455 headroom -= skb_headroom(skb);
1456 headroom = max_t(int, 0, headroom);
1458 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1464 hdr = (struct ieee80211_hdr *) skb->data;
1465 info->control.vif = &sdata->vif;
1467 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1468 ieee80211_is_data(hdr->frame_control) &&
1469 !is_multicast_ether_addr(hdr->addr1))
1470 if (mesh_nexthop_resolve(skb, sdata)) {
1471 /* skb queued: don't free */
1476 ieee80211_set_qos_hdr(sdata, skb);
1477 ieee80211_tx(sdata, skb, false);
1481 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1483 struct ieee80211_radiotap_iterator iterator;
1484 struct ieee80211_radiotap_header *rthdr =
1485 (struct ieee80211_radiotap_header *) skb->data;
1486 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1487 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1491 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1492 IEEE80211_TX_CTL_DONTFRAG;
1495 * for every radiotap entry that is present
1496 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1497 * entries present, or -EINVAL on error)
1501 ret = ieee80211_radiotap_iterator_next(&iterator);
1506 /* see if this argument is something we can use */
1507 switch (iterator.this_arg_index) {
1509 * You must take care when dereferencing iterator.this_arg
1510 * for multibyte types... the pointer is not aligned. Use
1511 * get_unaligned((type *)iterator.this_arg) to dereference
1512 * iterator.this_arg for type "type" safely on all arches.
1514 case IEEE80211_RADIOTAP_FLAGS:
1515 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1517 * this indicates that the skb we have been
1518 * handed has the 32-bit FCS CRC at the end...
1519 * we should react to that by snipping it off
1520 * because it will be recomputed and added
1523 if (skb->len < (iterator._max_length + FCS_LEN))
1526 skb_trim(skb, skb->len - FCS_LEN);
1528 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1529 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1530 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1531 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1534 case IEEE80211_RADIOTAP_TX_FLAGS:
1535 txflags = get_unaligned_le16(iterator.this_arg);
1536 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1537 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1541 * Please update the file
1542 * Documentation/networking/mac80211-injection.txt
1543 * when parsing new fields here.
1551 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1555 * remove the radiotap header
1556 * iterator->_max_length was sanity-checked against
1557 * skb->len by iterator init
1559 skb_pull(skb, iterator._max_length);
1564 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1565 struct net_device *dev)
1567 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1568 struct ieee80211_channel *chan = local->hw.conf.channel;
1569 struct ieee80211_radiotap_header *prthdr =
1570 (struct ieee80211_radiotap_header *)skb->data;
1571 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1572 struct ieee80211_hdr *hdr;
1573 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1578 * Frame injection is not allowed if beaconing is not allowed
1579 * or if we need radar detection. Beaconing is usually not allowed when
1580 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1581 * Passive scan is also used in world regulatory domains where
1582 * your country is not known and as such it should be treated as
1583 * NO TX unless the channel is explicitly allowed in which case
1584 * your current regulatory domain would not have the passive scan
1587 * Since AP mode uses monitor interfaces to inject/TX management
1588 * frames we can make AP mode the exception to this rule once it
1589 * supports radar detection as its implementation can deal with
1590 * radar detection by itself. We can do that later by adding a
1591 * monitor flag interfaces used for AP support.
1593 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1594 IEEE80211_CHAN_PASSIVE_SCAN)))
1597 /* check for not even having the fixed radiotap header part */
1598 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1599 goto fail; /* too short to be possibly valid */
1601 /* is it a header version we can trust to find length from? */
1602 if (unlikely(prthdr->it_version))
1603 goto fail; /* only version 0 is supported */
1605 /* then there must be a radiotap header with a length we can use */
1606 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1608 /* does the skb contain enough to deliver on the alleged length? */
1609 if (unlikely(skb->len < len_rthdr))
1610 goto fail; /* skb too short for claimed rt header extent */
1613 * fix up the pointers accounting for the radiotap
1614 * header still being in there. We are being given
1615 * a precooked IEEE80211 header so no need for
1618 skb_set_mac_header(skb, len_rthdr);
1620 * these are just fixed to the end of the rt area since we
1621 * don't have any better information and at this point, nobody cares
1623 skb_set_network_header(skb, len_rthdr);
1624 skb_set_transport_header(skb, len_rthdr);
1626 if (skb->len < len_rthdr + 2)
1629 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1630 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1632 if (skb->len < len_rthdr + hdrlen)
1636 * Initialize skb->protocol if the injected frame is a data frame
1637 * carrying a rfc1042 header
1639 if (ieee80211_is_data(hdr->frame_control) &&
1640 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1641 u8 *payload = (u8 *)hdr + hdrlen;
1643 if (compare_ether_addr(payload, rfc1042_header) == 0)
1644 skb->protocol = cpu_to_be16((payload[6] << 8) |
1648 memset(info, 0, sizeof(*info));
1650 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1651 IEEE80211_TX_CTL_INJECTED;
1653 /* process and remove the injection radiotap header */
1654 if (!ieee80211_parse_tx_radiotap(skb))
1660 * We process outgoing injected frames that have a local address
1661 * we handle as though they are non-injected frames.
1662 * This code here isn't entirely correct, the local MAC address
1663 * isn't always enough to find the interface to use; for proper
1664 * VLAN/WDS support we will need a different mechanism (which
1665 * likely isn't going to be monitor interfaces).
1667 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1669 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1670 if (!ieee80211_sdata_running(tmp_sdata))
1672 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1673 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1674 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1676 if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) {
1682 ieee80211_xmit(sdata, skb);
1685 return NETDEV_TX_OK;
1689 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1693 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1694 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1695 * @skb: packet to be sent
1696 * @dev: incoming interface
1698 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1699 * not be freed, and caller is responsible for either retrying later or freeing
1702 * This function takes in an Ethernet header and encapsulates it with suitable
1703 * IEEE 802.11 header based on which interface the packet is coming in. The
1704 * encapsulated packet will then be passed to master interface, wlan#.11, for
1705 * transmission (through low-level driver).
1707 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1708 struct net_device *dev)
1710 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1711 struct ieee80211_local *local = sdata->local;
1712 struct ieee80211_tx_info *info;
1713 int ret = NETDEV_TX_BUSY, head_need;
1714 u16 ethertype, hdrlen, meshhdrlen = 0;
1716 struct ieee80211_hdr hdr;
1717 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1718 struct mesh_path __maybe_unused *mppath = NULL;
1719 const u8 *encaps_data;
1720 int encaps_len, skip_header_bytes;
1722 struct sta_info *sta = NULL;
1723 bool wme_sta = false, authorized = false, tdls_auth = false;
1724 bool tdls_direct = false;
1729 if (unlikely(skb->len < ETH_HLEN)) {
1734 /* convert Ethernet header to proper 802.11 header (based on
1735 * operation mode) */
1736 ethertype = (skb->data[12] << 8) | skb->data[13];
1737 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1739 switch (sdata->vif.type) {
1740 case NL80211_IFTYPE_AP_VLAN:
1742 sta = rcu_dereference(sdata->u.vlan.sta);
1744 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1746 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1747 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1748 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1749 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1751 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1752 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1758 case NL80211_IFTYPE_AP:
1759 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1761 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1762 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1763 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1766 case NL80211_IFTYPE_WDS:
1767 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1769 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1770 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1771 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1772 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1775 #ifdef CONFIG_MAC80211_MESH
1776 case NL80211_IFTYPE_MESH_POINT:
1777 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1778 /* Do not send frames with mesh_ttl == 0 */
1779 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1784 if (!is_multicast_ether_addr(skb->data))
1785 mppath = mpp_path_lookup(skb->data, sdata);
1788 * Use address extension if it is a packet from
1789 * another interface or if we know the destination
1790 * is being proxied by a portal (i.e. portal address
1791 * differs from proxied address)
1793 if (compare_ether_addr(sdata->vif.addr,
1794 skb->data + ETH_ALEN) == 0 &&
1795 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
1796 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1797 skb->data, skb->data + ETH_ALEN);
1799 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1802 int is_mesh_mcast = 1;
1805 if (is_multicast_ether_addr(skb->data))
1806 /* DA TA mSA AE:SA */
1807 mesh_da = skb->data;
1809 static const u8 bcast[ETH_ALEN] =
1810 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1812 /* RA TA mDA mSA AE:DA SA */
1813 mesh_da = mppath->mpp;
1816 /* DA TA mSA AE:SA */
1820 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1821 mesh_da, sdata->vif.addr);
1825 ieee80211_new_mesh_header(&mesh_hdr,
1827 skb->data + ETH_ALEN,
1831 ieee80211_new_mesh_header(&mesh_hdr,
1834 skb->data + ETH_ALEN);
1839 case NL80211_IFTYPE_STATION:
1840 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1841 bool tdls_peer = false;
1844 sta = sta_info_get(sdata, skb->data);
1846 authorized = test_sta_flag(sta,
1847 WLAN_STA_AUTHORIZED);
1848 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1849 tdls_peer = test_sta_flag(sta,
1850 WLAN_STA_TDLS_PEER);
1851 tdls_auth = test_sta_flag(sta,
1852 WLAN_STA_TDLS_PEER_AUTH);
1857 * If the TDLS link is enabled, send everything
1858 * directly. Otherwise, allow TDLS setup frames
1859 * to be transmitted indirectly.
1861 tdls_direct = tdls_peer && (tdls_auth ||
1862 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1863 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1867 /* link during setup - throw out frames to peer */
1874 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1875 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1876 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1878 } else if (sdata->u.mgd.use_4addr &&
1879 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1880 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1881 IEEE80211_FCTL_TODS);
1883 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1884 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1885 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1886 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1889 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1891 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1892 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1893 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1897 case NL80211_IFTYPE_ADHOC:
1899 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1900 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1901 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1910 * There's no need to try to look up the destination
1911 * if it is a multicast address (which can only happen
1914 multicast = is_multicast_ether_addr(hdr.addr1);
1917 sta = sta_info_get(sdata, hdr.addr1);
1919 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1920 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1925 /* For mesh, the use of the QoS header is mandatory */
1926 if (ieee80211_vif_is_mesh(&sdata->vif))
1929 /* receiver and we are QoS enabled, use a QoS type frame */
1930 if (wme_sta && local->hw.queues >= 4) {
1931 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1936 * Drop unicast frames to unauthorised stations unless they are
1937 * EAPOL frames from the local station.
1939 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1940 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1941 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1942 compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1943 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1944 if (net_ratelimit())
1945 printk(KERN_DEBUG "%s: dropped frame to %pM"
1946 " (unauthorized port)\n", dev->name,
1950 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1956 if (unlikely(!multicast && skb->sk &&
1957 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1958 struct sk_buff *orig_skb = skb;
1960 skb = skb_clone(skb, GFP_ATOMIC);
1962 unsigned long flags;
1965 spin_lock_irqsave(&local->ack_status_lock, flags);
1966 r = idr_get_new_above(&local->ack_status_frames,
1969 idr_pre_get(&local->ack_status_frames,
1971 r = idr_get_new_above(&local->ack_status_frames,
1974 if (WARN_ON(!id) || id > 0xffff) {
1975 idr_remove(&local->ack_status_frames, id);
1978 spin_unlock_irqrestore(&local->ack_status_lock, flags);
1982 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1983 } else if (skb_shared(skb)) {
1984 kfree_skb(orig_skb);
1990 /* couldn't clone -- lose tx status ... */
1996 * If the skb is shared we need to obtain our own copy.
1998 if (skb_shared(skb)) {
1999 struct sk_buff *tmp_skb = skb;
2001 /* can't happen -- skb is a clone if info_id != 0 */
2004 skb = skb_clone(skb, GFP_ATOMIC);
2013 hdr.frame_control = fc;
2014 hdr.duration_id = 0;
2017 skip_header_bytes = ETH_HLEN;
2018 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2019 encaps_data = bridge_tunnel_header;
2020 encaps_len = sizeof(bridge_tunnel_header);
2021 skip_header_bytes -= 2;
2022 } else if (ethertype >= 0x600) {
2023 encaps_data = rfc1042_header;
2024 encaps_len = sizeof(rfc1042_header);
2025 skip_header_bytes -= 2;
2031 nh_pos = skb_network_header(skb) - skb->data;
2032 h_pos = skb_transport_header(skb) - skb->data;
2034 skb_pull(skb, skip_header_bytes);
2035 nh_pos -= skip_header_bytes;
2036 h_pos -= skip_header_bytes;
2038 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2041 * So we need to modify the skb header and hence need a copy of
2042 * that. The head_need variable above doesn't, so far, include
2043 * the needed header space that we don't need right away. If we
2044 * can, then we don't reallocate right now but only after the
2045 * frame arrives at the master device (if it does...)
2047 * If we cannot, however, then we will reallocate to include all
2048 * the ever needed space. Also, if we need to reallocate it anyway,
2049 * make it big enough for everything we may ever need.
2052 if (head_need > 0 || skb_cloned(skb)) {
2053 head_need += IEEE80211_ENCRYPT_HEADROOM;
2054 head_need += local->tx_headroom;
2055 head_need = max_t(int, 0, head_need);
2056 if (ieee80211_skb_resize(sdata, skb, head_need, true))
2061 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2062 nh_pos += encaps_len;
2063 h_pos += encaps_len;
2066 #ifdef CONFIG_MAC80211_MESH
2067 if (meshhdrlen > 0) {
2068 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2069 nh_pos += meshhdrlen;
2070 h_pos += meshhdrlen;
2074 if (ieee80211_is_data_qos(fc)) {
2075 __le16 *qos_control;
2077 qos_control = (__le16*) skb_push(skb, 2);
2078 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2080 * Maybe we could actually set some fields here, for now just
2081 * initialise to zero to indicate no special operation.
2085 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2090 dev->stats.tx_packets++;
2091 dev->stats.tx_bytes += skb->len;
2093 /* Update skb pointers to various headers since this modified frame
2094 * is going to go through Linux networking code that may potentially
2095 * need things like pointer to IP header. */
2096 skb_set_mac_header(skb, 0);
2097 skb_set_network_header(skb, nh_pos);
2098 skb_set_transport_header(skb, h_pos);
2100 info = IEEE80211_SKB_CB(skb);
2101 memset(info, 0, sizeof(*info));
2103 dev->trans_start = jiffies;
2105 info->flags = info_flags;
2106 info->ack_frame_id = info_id;
2108 ieee80211_xmit(sdata, skb);
2110 return NETDEV_TX_OK;
2113 if (ret == NETDEV_TX_OK)
2121 * ieee80211_clear_tx_pending may not be called in a context where
2122 * it is possible that it packets could come in again.
2124 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2128 for (i = 0; i < local->hw.queues; i++)
2129 skb_queue_purge(&local->pending[i]);
2133 * Returns false if the frame couldn't be transmitted but was queued instead,
2134 * which in this case means re-queued -- take as an indication to stop sending
2135 * more pending frames.
2137 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2138 struct sk_buff *skb)
2140 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2141 struct ieee80211_sub_if_data *sdata;
2142 struct sta_info *sta;
2143 struct ieee80211_hdr *hdr;
2146 sdata = vif_to_sdata(info->control.vif);
2148 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2149 result = ieee80211_tx(sdata, skb, true);
2151 struct sk_buff_head skbs;
2153 __skb_queue_head_init(&skbs);
2154 __skb_queue_tail(&skbs, skb);
2156 hdr = (struct ieee80211_hdr *)skb->data;
2157 sta = sta_info_get(sdata, hdr->addr1);
2159 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2166 * Transmit all pending packets. Called from tasklet.
2168 void ieee80211_tx_pending(unsigned long data)
2170 struct ieee80211_local *local = (struct ieee80211_local *)data;
2171 struct ieee80211_sub_if_data *sdata;
2172 unsigned long flags;
2178 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2179 for (i = 0; i < local->hw.queues; i++) {
2181 * If queue is stopped by something other than due to pending
2182 * frames, or we have no pending frames, proceed to next queue.
2184 if (local->queue_stop_reasons[i] ||
2185 skb_queue_empty(&local->pending[i]))
2188 while (!skb_queue_empty(&local->pending[i])) {
2189 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2190 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2192 if (WARN_ON(!info->control.vif)) {
2197 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2200 txok = ieee80211_tx_pending_skb(local, skb);
2201 spin_lock_irqsave(&local->queue_stop_reason_lock,
2207 if (skb_queue_empty(&local->pending[i]))
2208 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2209 netif_wake_subqueue(sdata->dev, i);
2211 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2216 /* functions for drivers to get certain frames */
2218 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2219 struct sk_buff *skb,
2220 struct beacon_data *beacon)
2224 int i, have_bits = 0, n1, n2;
2226 /* Generate bitmap for TIM only if there are any STAs in power save
2228 if (atomic_read(&bss->num_sta_ps) > 0)
2229 /* in the hope that this is faster than
2230 * checking byte-for-byte */
2231 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2232 IEEE80211_MAX_AID+1);
2234 if (bss->dtim_count == 0)
2235 bss->dtim_count = beacon->dtim_period - 1;
2239 tim = pos = (u8 *) skb_put(skb, 6);
2240 *pos++ = WLAN_EID_TIM;
2242 *pos++ = bss->dtim_count;
2243 *pos++ = beacon->dtim_period;
2245 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2248 bss->dtim_bc_mc = aid0 == 1;
2251 /* Find largest even number N1 so that bits numbered 1 through
2252 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2253 * (N2 + 1) x 8 through 2007 are 0. */
2255 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2262 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2269 /* Bitmap control */
2271 /* Part Virt Bitmap */
2272 skb_put(skb, n2 - n1);
2273 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2275 tim[1] = n2 - n1 + 4;
2277 *pos++ = aid0; /* Bitmap control */
2278 *pos++ = 0; /* Part Virt Bitmap */
2282 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2283 struct ieee80211_vif *vif,
2284 u16 *tim_offset, u16 *tim_length)
2286 struct ieee80211_local *local = hw_to_local(hw);
2287 struct sk_buff *skb = NULL;
2288 struct ieee80211_tx_info *info;
2289 struct ieee80211_sub_if_data *sdata = NULL;
2290 struct ieee80211_if_ap *ap = NULL;
2291 struct beacon_data *beacon;
2292 struct ieee80211_supported_band *sband;
2293 enum ieee80211_band band = local->hw.conf.channel->band;
2294 struct ieee80211_tx_rate_control txrc;
2296 sband = local->hw.wiphy->bands[band];
2300 sdata = vif_to_sdata(vif);
2302 if (!ieee80211_sdata_running(sdata))
2310 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2312 beacon = rcu_dereference(ap->beacon);
2315 * headroom, head length,
2316 * tail length and maximum TIM length
2318 skb = dev_alloc_skb(local->tx_headroom +
2320 beacon->tail_len + 256);
2324 skb_reserve(skb, local->tx_headroom);
2325 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2329 * Not very nice, but we want to allow the driver to call
2330 * ieee80211_beacon_get() as a response to the set_tim()
2331 * callback. That, however, is already invoked under the
2332 * sta_lock to guarantee consistent and race-free update
2333 * of the tim bitmap in mac80211 and the driver.
2335 if (local->tim_in_locked_section) {
2336 ieee80211_beacon_add_tim(ap, skb, beacon);
2338 unsigned long flags;
2340 spin_lock_irqsave(&local->sta_lock, flags);
2341 ieee80211_beacon_add_tim(ap, skb, beacon);
2342 spin_unlock_irqrestore(&local->sta_lock, flags);
2346 *tim_offset = beacon->head_len;
2348 *tim_length = skb->len - beacon->head_len;
2351 memcpy(skb_put(skb, beacon->tail_len),
2352 beacon->tail, beacon->tail_len);
2355 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2356 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2357 struct ieee80211_hdr *hdr;
2358 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2363 skb = skb_copy(presp, GFP_ATOMIC);
2367 hdr = (struct ieee80211_hdr *) skb->data;
2368 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2369 IEEE80211_STYPE_BEACON);
2370 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2371 struct ieee80211_mgmt *mgmt;
2373 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
2374 sizeof(mgmt->u.beacon);
2376 #ifdef CONFIG_MAC80211_MESH
2377 if (!sdata->u.mesh.mesh_id_len)
2381 skb = dev_alloc_skb(local->tx_headroom +
2384 2 + 8 + /* supported rates */
2385 2 + 3 + /* DS params */
2386 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
2387 2 + sizeof(struct ieee80211_ht_cap) +
2388 2 + sizeof(struct ieee80211_ht_info) +
2389 2 + sdata->u.mesh.mesh_id_len +
2390 2 + sizeof(struct ieee80211_meshconf_ie) +
2391 sdata->u.mesh.ie_len);
2395 skb_reserve(skb, local->hw.extra_tx_headroom);
2396 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
2397 memset(mgmt, 0, hdr_len);
2398 mgmt->frame_control =
2399 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2400 memset(mgmt->da, 0xff, ETH_ALEN);
2401 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2402 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2403 mgmt->u.beacon.beacon_int =
2404 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2405 mgmt->u.beacon.capab_info |= cpu_to_le16(
2406 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
2408 pos = skb_put(skb, 2);
2409 *pos++ = WLAN_EID_SSID;
2412 if (ieee80211_add_srates_ie(&sdata->vif, skb) ||
2413 mesh_add_ds_params_ie(skb, sdata) ||
2414 ieee80211_add_ext_srates_ie(&sdata->vif, skb) ||
2415 mesh_add_rsn_ie(skb, sdata) ||
2416 mesh_add_ht_cap_ie(skb, sdata) ||
2417 mesh_add_ht_info_ie(skb, sdata) ||
2418 mesh_add_meshid_ie(skb, sdata) ||
2419 mesh_add_meshconf_ie(skb, sdata) ||
2420 mesh_add_vendor_ies(skb, sdata)) {
2421 pr_err("o11s: couldn't add ies!\n");
2429 info = IEEE80211_SKB_CB(skb);
2431 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2432 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2435 memset(&txrc, 0, sizeof(txrc));
2438 txrc.bss_conf = &sdata->vif.bss_conf;
2440 txrc.reported_rate.idx = -1;
2441 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2442 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2443 txrc.max_rate_idx = -1;
2445 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2447 rate_control_get_rate(sdata, NULL, &txrc);
2449 info->control.vif = vif;
2451 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2452 IEEE80211_TX_CTL_ASSIGN_SEQ |
2453 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2458 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2460 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2461 struct ieee80211_vif *vif)
2463 struct ieee80211_if_ap *ap = NULL;
2464 struct sk_buff *presp = NULL, *skb = NULL;
2465 struct ieee80211_hdr *hdr;
2466 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2468 if (sdata->vif.type != NL80211_IFTYPE_AP)
2474 presp = rcu_dereference(ap->probe_resp);
2478 skb = skb_copy(presp, GFP_ATOMIC);
2482 hdr = (struct ieee80211_hdr *) skb->data;
2483 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2489 EXPORT_SYMBOL(ieee80211_proberesp_get);
2491 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2492 struct ieee80211_vif *vif)
2494 struct ieee80211_sub_if_data *sdata;
2495 struct ieee80211_if_managed *ifmgd;
2496 struct ieee80211_pspoll *pspoll;
2497 struct ieee80211_local *local;
2498 struct sk_buff *skb;
2500 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2503 sdata = vif_to_sdata(vif);
2504 ifmgd = &sdata->u.mgd;
2505 local = sdata->local;
2507 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2511 skb_reserve(skb, local->hw.extra_tx_headroom);
2513 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2514 memset(pspoll, 0, sizeof(*pspoll));
2515 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2516 IEEE80211_STYPE_PSPOLL);
2517 pspoll->aid = cpu_to_le16(ifmgd->aid);
2519 /* aid in PS-Poll has its two MSBs each set to 1 */
2520 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2522 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2523 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2527 EXPORT_SYMBOL(ieee80211_pspoll_get);
2529 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2530 struct ieee80211_vif *vif)
2532 struct ieee80211_hdr_3addr *nullfunc;
2533 struct ieee80211_sub_if_data *sdata;
2534 struct ieee80211_if_managed *ifmgd;
2535 struct ieee80211_local *local;
2536 struct sk_buff *skb;
2538 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2541 sdata = vif_to_sdata(vif);
2542 ifmgd = &sdata->u.mgd;
2543 local = sdata->local;
2545 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2549 skb_reserve(skb, local->hw.extra_tx_headroom);
2551 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2553 memset(nullfunc, 0, sizeof(*nullfunc));
2554 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2555 IEEE80211_STYPE_NULLFUNC |
2556 IEEE80211_FCTL_TODS);
2557 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2558 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2559 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2563 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2565 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2566 struct ieee80211_vif *vif,
2567 const u8 *ssid, size_t ssid_len,
2568 const u8 *ie, size_t ie_len)
2570 struct ieee80211_sub_if_data *sdata;
2571 struct ieee80211_local *local;
2572 struct ieee80211_hdr_3addr *hdr;
2573 struct sk_buff *skb;
2577 sdata = vif_to_sdata(vif);
2578 local = sdata->local;
2579 ie_ssid_len = 2 + ssid_len;
2581 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2582 ie_ssid_len + ie_len);
2586 skb_reserve(skb, local->hw.extra_tx_headroom);
2588 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2589 memset(hdr, 0, sizeof(*hdr));
2590 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2591 IEEE80211_STYPE_PROBE_REQ);
2592 memset(hdr->addr1, 0xff, ETH_ALEN);
2593 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2594 memset(hdr->addr3, 0xff, ETH_ALEN);
2596 pos = skb_put(skb, ie_ssid_len);
2597 *pos++ = WLAN_EID_SSID;
2600 memcpy(pos, ssid, ssid_len);
2604 pos = skb_put(skb, ie_len);
2605 memcpy(pos, ie, ie_len);
2610 EXPORT_SYMBOL(ieee80211_probereq_get);
2612 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2613 const void *frame, size_t frame_len,
2614 const struct ieee80211_tx_info *frame_txctl,
2615 struct ieee80211_rts *rts)
2617 const struct ieee80211_hdr *hdr = frame;
2619 rts->frame_control =
2620 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2621 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2623 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2624 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2626 EXPORT_SYMBOL(ieee80211_rts_get);
2628 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2629 const void *frame, size_t frame_len,
2630 const struct ieee80211_tx_info *frame_txctl,
2631 struct ieee80211_cts *cts)
2633 const struct ieee80211_hdr *hdr = frame;
2635 cts->frame_control =
2636 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2637 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2638 frame_len, frame_txctl);
2639 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2641 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2644 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2645 struct ieee80211_vif *vif)
2647 struct ieee80211_local *local = hw_to_local(hw);
2648 struct sk_buff *skb = NULL;
2649 struct ieee80211_tx_data tx;
2650 struct ieee80211_sub_if_data *sdata;
2651 struct ieee80211_if_ap *bss = NULL;
2652 struct beacon_data *beacon;
2653 struct ieee80211_tx_info *info;
2655 sdata = vif_to_sdata(vif);
2659 beacon = rcu_dereference(bss->beacon);
2661 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2664 if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2665 goto out; /* send buffered bc/mc only after DTIM beacon */
2668 skb = skb_dequeue(&bss->ps_bc_buf);
2671 local->total_ps_buffered--;
2673 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2674 struct ieee80211_hdr *hdr =
2675 (struct ieee80211_hdr *) skb->data;
2676 /* more buffered multicast/broadcast frames ==> set
2677 * MoreData flag in IEEE 802.11 header to inform PS
2679 hdr->frame_control |=
2680 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2683 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2685 dev_kfree_skb_any(skb);
2688 info = IEEE80211_SKB_CB(skb);
2690 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2691 tx.channel = local->hw.conf.channel;
2692 info->band = tx.channel->band;
2694 if (invoke_tx_handlers(&tx))
2701 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2703 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
2705 skb_set_mac_header(skb, 0);
2706 skb_set_network_header(skb, 0);
2707 skb_set_transport_header(skb, 0);
2709 /* Send all internal mgmt frames on VO. Accordingly set TID to 7. */
2710 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
2714 * The other path calling ieee80211_xmit is from the tasklet,
2715 * and while we can handle concurrent transmissions locking
2716 * requirements are that we do not come into tx with bhs on.
2719 ieee80211_xmit(sdata, skb);