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: ifmgd->uapsd_queues access is racy here. If the value is
230 * changed via debugfs, user needs to reassociate manually to have
231 * everything in sync.
233 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
234 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
235 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
238 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
239 ieee80211_stop_queues_by_reason(&local->hw,
240 IEEE80211_QUEUE_STOP_REASON_PS);
241 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
242 ieee80211_queue_work(&local->hw,
243 &local->dynamic_ps_disable_work);
246 /* Don't restart the timer if we're not disassociated */
247 if (!ifmgd->associated)
250 mod_timer(&local->dynamic_ps_timer, jiffies +
251 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
256 static ieee80211_tx_result debug_noinline
257 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
260 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
261 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
264 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
267 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
268 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
269 !ieee80211_is_probe_req(hdr->frame_control) &&
270 !ieee80211_is_nullfunc(hdr->frame_control))
272 * When software scanning only nullfunc frames (to notify
273 * the sleep state to the AP) and probe requests (for the
274 * active scan) are allowed, all other frames should not be
275 * sent and we should not get here, but if we do
276 * nonetheless, drop them to avoid sending them
277 * off-channel. See the link below and
278 * ieee80211_start_scan() for more.
280 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
284 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
287 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
290 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
294 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
296 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
297 if (unlikely(!assoc &&
298 ieee80211_is_data(hdr->frame_control))) {
299 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
300 printk(KERN_DEBUG "%s: dropped data frame to not "
301 "associated station %pM\n",
302 tx->sdata->name, hdr->addr1);
303 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
304 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
307 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
308 ieee80211_is_data(hdr->frame_control) &&
309 !atomic_read(&tx->sdata->u.ap.num_sta_authorized))) {
311 * No associated STAs - no need to send multicast
320 /* This function is called whenever the AP is about to exceed the maximum limit
321 * of buffered frames for power saving STAs. This situation should not really
322 * happen often during normal operation, so dropping the oldest buffered packet
323 * from each queue should be OK to make some room for new frames. */
324 static void purge_old_ps_buffers(struct ieee80211_local *local)
326 int total = 0, purged = 0;
328 struct ieee80211_sub_if_data *sdata;
329 struct sta_info *sta;
332 * virtual interfaces are protected by RCU
336 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
337 struct ieee80211_if_ap *ap;
338 if (sdata->vif.type != NL80211_IFTYPE_AP)
341 skb = skb_dequeue(&ap->ps_bc_buf);
346 total += skb_queue_len(&ap->ps_bc_buf);
350 * Drop one frame from each station from the lowest-priority
351 * AC that has frames at all.
353 list_for_each_entry_rcu(sta, &local->sta_list, list) {
356 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
357 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
358 total += skb_queue_len(&sta->ps_tx_buf[ac]);
369 local->total_ps_buffered = total;
370 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
371 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
376 static ieee80211_tx_result
377 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
379 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
380 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
383 * broadcast/multicast frame
385 * If any of the associated stations is in power save mode,
386 * the frame is buffered to be sent after DTIM beacon frame.
387 * This is done either by the hardware or us.
390 /* powersaving STAs only in AP/VLAN mode */
394 /* no buffering for ordered frames */
395 if (ieee80211_has_order(hdr->frame_control))
398 /* no stations in PS mode */
399 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
402 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
404 /* device releases frame after DTIM beacon */
405 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
408 /* buffered in mac80211 */
409 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
410 purge_old_ps_buffers(tx->local);
412 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
413 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
415 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
418 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
420 tx->local->total_ps_buffered++;
422 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
427 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
430 if (!ieee80211_is_mgmt(fc))
433 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
436 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
443 static ieee80211_tx_result
444 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
446 struct sta_info *sta = tx->sta;
447 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
448 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
449 struct ieee80211_local *local = tx->local;
454 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
455 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
456 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
457 int ac = skb_get_queue_mapping(tx->skb);
459 /* only deauth, disassoc and action are bufferable MMPDUs */
460 if (ieee80211_is_mgmt(hdr->frame_control) &&
461 !ieee80211_is_deauth(hdr->frame_control) &&
462 !ieee80211_is_disassoc(hdr->frame_control) &&
463 !ieee80211_is_action(hdr->frame_control)) {
464 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
468 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
469 printk(KERN_DEBUG "STA %pM aid %d: PS buffer for AC %d\n",
470 sta->sta.addr, sta->sta.aid, ac);
471 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
472 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
473 purge_old_ps_buffers(tx->local);
474 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
475 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
476 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
478 printk(KERN_DEBUG "%s: STA %pM TX buffer for "
479 "AC %d full - dropping oldest frame\n",
480 tx->sdata->name, sta->sta.addr, ac);
484 tx->local->total_ps_buffered++;
486 info->control.jiffies = jiffies;
487 info->control.vif = &tx->sdata->vif;
488 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
489 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
491 if (!timer_pending(&local->sta_cleanup))
492 mod_timer(&local->sta_cleanup,
493 round_jiffies(jiffies +
494 STA_INFO_CLEANUP_INTERVAL));
497 * We queued up some frames, so the TIM bit might
498 * need to be set, recalculate it.
500 sta_info_recalc_tim(sta);
504 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
505 else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
507 "%s: STA %pM in PS mode, but polling/in SP -> send frame\n",
508 tx->sdata->name, sta->sta.addr);
510 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
515 static ieee80211_tx_result debug_noinline
516 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
518 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
521 if (tx->flags & IEEE80211_TX_UNICAST)
522 return ieee80211_tx_h_unicast_ps_buf(tx);
524 return ieee80211_tx_h_multicast_ps_buf(tx);
527 static ieee80211_tx_result debug_noinline
528 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
530 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
532 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
533 tx->sdata->control_port_no_encrypt))
534 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
539 static ieee80211_tx_result debug_noinline
540 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
542 struct ieee80211_key *key = NULL;
543 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
544 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
546 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
548 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
550 else if (ieee80211_is_mgmt(hdr->frame_control) &&
551 is_multicast_ether_addr(hdr->addr1) &&
552 ieee80211_is_robust_mgmt_frame(hdr) &&
553 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
555 else if (is_multicast_ether_addr(hdr->addr1) &&
556 (key = rcu_dereference(tx->sdata->default_multicast_key)))
558 else if (!is_multicast_ether_addr(hdr->addr1) &&
559 (key = rcu_dereference(tx->sdata->default_unicast_key)))
561 else if (tx->sdata->drop_unencrypted &&
562 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
563 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
564 (!ieee80211_is_robust_mgmt_frame(hdr) ||
565 (ieee80211_is_action(hdr->frame_control) &&
566 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))) {
567 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
573 bool skip_hw = false;
575 tx->key->tx_rx_count++;
576 /* TODO: add threshold stuff again */
578 switch (tx->key->conf.cipher) {
579 case WLAN_CIPHER_SUITE_WEP40:
580 case WLAN_CIPHER_SUITE_WEP104:
581 case WLAN_CIPHER_SUITE_TKIP:
582 if (!ieee80211_is_data_present(hdr->frame_control))
585 case WLAN_CIPHER_SUITE_CCMP:
586 if (!ieee80211_is_data_present(hdr->frame_control) &&
587 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
591 skip_hw = (tx->key->conf.flags &
592 IEEE80211_KEY_FLAG_SW_MGMT) &&
593 ieee80211_is_mgmt(hdr->frame_control);
595 case WLAN_CIPHER_SUITE_AES_CMAC:
596 if (!ieee80211_is_mgmt(hdr->frame_control))
601 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
604 if (!skip_hw && tx->key &&
605 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
606 info->control.hw_key = &tx->key->conf;
612 static ieee80211_tx_result debug_noinline
613 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
615 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
616 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
617 struct ieee80211_supported_band *sband;
618 struct ieee80211_rate *rate;
621 bool inval = false, rts = false, short_preamble = false;
622 struct ieee80211_tx_rate_control txrc;
625 memset(&txrc, 0, sizeof(txrc));
627 sband = tx->local->hw.wiphy->bands[tx->channel->band];
629 len = min_t(u32, tx->skb->len + FCS_LEN,
630 tx->local->hw.wiphy->frag_threshold);
632 /* set up the tx rate control struct we give the RC algo */
633 txrc.hw = &tx->local->hw;
635 txrc.bss_conf = &tx->sdata->vif.bss_conf;
637 txrc.reported_rate.idx = -1;
638 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
639 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
640 txrc.max_rate_idx = -1;
642 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
643 memcpy(txrc.rate_idx_mcs_mask,
644 tx->sdata->rc_rateidx_mcs_mask[tx->channel->band],
645 sizeof(txrc.rate_idx_mcs_mask));
646 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
647 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
648 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
650 /* set up RTS protection if desired */
651 if (len > tx->local->hw.wiphy->rts_threshold) {
652 txrc.rts = rts = true;
656 * Use short preamble if the BSS can handle it, but not for
657 * management frames unless we know the receiver can handle
658 * that -- the management frame might be to a station that
659 * just wants a probe response.
661 if (tx->sdata->vif.bss_conf.use_short_preamble &&
662 (ieee80211_is_data(hdr->frame_control) ||
663 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
664 txrc.short_preamble = short_preamble = true;
667 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
670 * Lets not bother rate control if we're associated and cannot
671 * talk to the sta. This should not happen.
673 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
674 !rate_usable_index_exists(sband, &tx->sta->sta),
675 "%s: Dropped data frame as no usable bitrate found while "
676 "scanning and associated. Target station: "
677 "%pM on %d GHz band\n",
678 tx->sdata->name, hdr->addr1,
679 tx->channel->band ? 5 : 2))
683 * If we're associated with the sta at this point we know we can at
684 * least send the frame at the lowest bit rate.
686 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
688 if (unlikely(info->control.rates[0].idx < 0))
691 if (txrc.reported_rate.idx < 0) {
692 txrc.reported_rate = info->control.rates[0];
693 if (tx->sta && ieee80211_is_data(hdr->frame_control))
694 tx->sta->last_tx_rate = txrc.reported_rate;
696 tx->sta->last_tx_rate = txrc.reported_rate;
698 if (unlikely(!info->control.rates[0].count))
699 info->control.rates[0].count = 1;
701 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
702 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
703 info->control.rates[0].count = 1;
705 if (is_multicast_ether_addr(hdr->addr1)) {
707 * XXX: verify the rate is in the basic rateset
713 * set up the RTS/CTS rate as the fastest basic rate
714 * that is not faster than the data rate
716 * XXX: Should this check all retry rates?
718 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
721 rate = &sband->bitrates[info->control.rates[0].idx];
723 for (i = 0; i < sband->n_bitrates; i++) {
724 /* must be a basic rate */
725 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
727 /* must not be faster than the data rate */
728 if (sband->bitrates[i].bitrate > rate->bitrate)
731 if (sband->bitrates[baserate].bitrate <
732 sband->bitrates[i].bitrate)
736 info->control.rts_cts_rate_idx = baserate;
739 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
741 * make sure there's no valid rate following
742 * an invalid one, just in case drivers don't
743 * take the API seriously to stop at -1.
746 info->control.rates[i].idx = -1;
749 if (info->control.rates[i].idx < 0) {
755 * For now assume MCS is already set up correctly, this
758 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
759 WARN_ON(info->control.rates[i].idx > 76);
763 /* set up RTS protection if desired */
765 info->control.rates[i].flags |=
766 IEEE80211_TX_RC_USE_RTS_CTS;
769 if (WARN_ON_ONCE(info->control.rates[i].idx >=
770 sband->n_bitrates)) {
771 info->control.rates[i].idx = -1;
775 rate = &sband->bitrates[info->control.rates[i].idx];
777 /* set up short preamble */
778 if (short_preamble &&
779 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
780 info->control.rates[i].flags |=
781 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
783 /* set up G protection */
784 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
785 rate->flags & IEEE80211_RATE_ERP_G)
786 info->control.rates[i].flags |=
787 IEEE80211_TX_RC_USE_CTS_PROTECT;
793 static ieee80211_tx_result debug_noinline
794 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
796 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
797 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
803 * Packet injection may want to control the sequence
804 * number, if we have no matching interface then we
805 * neither assign one ourselves nor ask the driver to.
807 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
810 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
813 if (ieee80211_hdrlen(hdr->frame_control) < 24)
816 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
820 * Anything but QoS data that has a sequence number field
821 * (is long enough) gets a sequence number from the global
824 if (!ieee80211_is_data_qos(hdr->frame_control)) {
825 /* driver should assign sequence number */
826 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
827 /* for pure STA mode without beacons, we can do it */
828 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
829 tx->sdata->sequence_number += 0x10;
834 * This should be true for injected/management frames only, for
835 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
836 * above since they are not QoS-data frames.
841 /* include per-STA, per-TID sequence counter */
843 qc = ieee80211_get_qos_ctl(hdr);
844 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
845 seq = &tx->sta->tid_seq[tid];
847 hdr->seq_ctrl = cpu_to_le16(*seq);
849 /* Increase the sequence number. */
850 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
855 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
856 struct sk_buff *skb, int hdrlen,
859 struct ieee80211_local *local = tx->local;
860 struct ieee80211_tx_info *info;
862 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
863 int pos = hdrlen + per_fragm;
864 int rem = skb->len - hdrlen - per_fragm;
866 if (WARN_ON(rem < 0))
869 /* first fragment was already added to queue by caller */
872 int fraglen = per_fragm;
877 tmp = dev_alloc_skb(local->tx_headroom +
879 IEEE80211_ENCRYPT_HEADROOM +
880 IEEE80211_ENCRYPT_TAILROOM);
884 __skb_queue_tail(&tx->skbs, tmp);
886 skb_reserve(tmp, local->tx_headroom +
887 IEEE80211_ENCRYPT_HEADROOM);
888 /* copy control information */
889 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
891 info = IEEE80211_SKB_CB(tmp);
892 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
893 IEEE80211_TX_CTL_FIRST_FRAGMENT);
896 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
898 skb_copy_queue_mapping(tmp, skb);
899 tmp->priority = skb->priority;
902 /* copy header and data */
903 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
904 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
909 /* adjust first fragment's length */
910 skb->len = hdrlen + per_fragm;
914 static ieee80211_tx_result debug_noinline
915 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
917 struct sk_buff *skb = tx->skb;
918 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
919 struct ieee80211_hdr *hdr = (void *)skb->data;
920 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
924 /* no matter what happens, tx->skb moves to tx->skbs */
925 __skb_queue_tail(&tx->skbs, skb);
928 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
931 if (tx->local->ops->set_frag_threshold)
935 * Warn when submitting a fragmented A-MPDU frame and drop it.
936 * This scenario is handled in ieee80211_tx_prepare but extra
937 * caution taken here as fragmented ampdu may cause Tx stop.
939 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
942 hdrlen = ieee80211_hdrlen(hdr->frame_control);
944 /* internal error, why isn't DONTFRAG set? */
945 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
949 * Now fragment the frame. This will allocate all the fragments and
950 * chain them (using skb as the first fragment) to skb->next.
951 * During transmission, we will remove the successfully transmitted
952 * fragments from this list. When the low-level driver rejects one
953 * of the fragments then we will simply pretend to accept the skb
954 * but store it away as pending.
956 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
959 /* update duration/seq/flags of fragments */
962 skb_queue_walk(&tx->skbs, skb) {
964 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
966 hdr = (void *)skb->data;
967 info = IEEE80211_SKB_CB(skb);
969 if (!skb_queue_is_last(&tx->skbs, skb)) {
970 hdr->frame_control |= morefrags;
972 * No multi-rate retries for fragmented frames, that
973 * would completely throw off the NAV at other STAs.
975 info->control.rates[1].idx = -1;
976 info->control.rates[2].idx = -1;
977 info->control.rates[3].idx = -1;
978 info->control.rates[4].idx = -1;
979 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
980 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
982 hdr->frame_control &= ~morefrags;
985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
992 static ieee80211_tx_result debug_noinline
993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1000 tx->sta->tx_packets++;
1001 skb_queue_walk(&tx->skbs, skb) {
1002 tx->sta->tx_fragments++;
1003 tx->sta->tx_bytes += skb->len;
1009 static ieee80211_tx_result debug_noinline
1010 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1015 switch (tx->key->conf.cipher) {
1016 case WLAN_CIPHER_SUITE_WEP40:
1017 case WLAN_CIPHER_SUITE_WEP104:
1018 return ieee80211_crypto_wep_encrypt(tx);
1019 case WLAN_CIPHER_SUITE_TKIP:
1020 return ieee80211_crypto_tkip_encrypt(tx);
1021 case WLAN_CIPHER_SUITE_CCMP:
1022 return ieee80211_crypto_ccmp_encrypt(tx);
1023 case WLAN_CIPHER_SUITE_AES_CMAC:
1024 return ieee80211_crypto_aes_cmac_encrypt(tx);
1026 return ieee80211_crypto_hw_encrypt(tx);
1032 static ieee80211_tx_result debug_noinline
1033 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1035 struct sk_buff *skb;
1036 struct ieee80211_hdr *hdr;
1040 skb_queue_walk(&tx->skbs, skb) {
1041 hdr = (void *) skb->data;
1042 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1043 break; /* must not overwrite AID */
1044 if (!skb_queue_is_last(&tx->skbs, skb)) {
1045 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1046 next_len = next->len;
1049 group_addr = is_multicast_ether_addr(hdr->addr1);
1052 ieee80211_duration(tx, skb, group_addr, next_len);
1058 /* actual transmit path */
1060 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1061 struct sk_buff *skb,
1062 struct ieee80211_tx_info *info,
1063 struct tid_ampdu_tx *tid_tx,
1066 bool queued = false;
1067 bool reset_agg_timer = false;
1068 struct sk_buff *purge_skb = NULL;
1070 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1071 info->flags |= IEEE80211_TX_CTL_AMPDU;
1072 reset_agg_timer = true;
1073 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1075 * nothing -- this aggregation session is being started
1076 * but that might still fail with the driver
1079 spin_lock(&tx->sta->lock);
1081 * Need to re-check now, because we may get here
1083 * 1) in the window during which the setup is actually
1084 * already done, but not marked yet because not all
1085 * packets are spliced over to the driver pending
1086 * queue yet -- if this happened we acquire the lock
1087 * either before or after the splice happens, but
1088 * need to recheck which of these cases happened.
1090 * 2) during session teardown, if the OPERATIONAL bit
1091 * was cleared due to the teardown but the pointer
1092 * hasn't been assigned NULL yet (or we loaded it
1093 * before it was assigned) -- in this case it may
1094 * now be NULL which means we should just let the
1095 * packet pass through because splicing the frames
1096 * back is already done.
1098 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1101 /* do nothing, let packet pass through */
1102 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1103 info->flags |= IEEE80211_TX_CTL_AMPDU;
1104 reset_agg_timer = true;
1107 info->control.vif = &tx->sdata->vif;
1108 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1109 __skb_queue_tail(&tid_tx->pending, skb);
1110 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1111 purge_skb = __skb_dequeue(&tid_tx->pending);
1113 spin_unlock(&tx->sta->lock);
1116 dev_kfree_skb(purge_skb);
1119 /* reset session timer */
1120 if (reset_agg_timer && tid_tx->timeout)
1121 tid_tx->last_tx = jiffies;
1129 static ieee80211_tx_result
1130 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1131 struct ieee80211_tx_data *tx,
1132 struct sk_buff *skb)
1134 struct ieee80211_local *local = sdata->local;
1135 struct ieee80211_hdr *hdr;
1136 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1140 memset(tx, 0, sizeof(*tx));
1144 tx->channel = local->hw.conf.channel;
1145 __skb_queue_head_init(&tx->skbs);
1148 * If this flag is set to true anywhere, and we get here,
1149 * we are doing the needed processing, so remove the flag
1152 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1154 hdr = (struct ieee80211_hdr *) skb->data;
1156 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1157 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1158 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1160 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
1161 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1164 tx->sta = sta_info_get(sdata, hdr->addr1);
1166 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1167 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1168 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1169 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1170 struct tid_ampdu_tx *tid_tx;
1172 qc = ieee80211_get_qos_ctl(hdr);
1173 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1175 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1179 queued = ieee80211_tx_prep_agg(tx, skb, info,
1182 if (unlikely(queued))
1187 if (is_multicast_ether_addr(hdr->addr1)) {
1188 tx->flags &= ~IEEE80211_TX_UNICAST;
1189 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1191 tx->flags |= IEEE80211_TX_UNICAST;
1193 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1194 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1195 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1196 info->flags & IEEE80211_TX_CTL_AMPDU)
1197 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1201 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1202 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1203 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1205 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1210 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1211 struct ieee80211_vif *vif,
1212 struct ieee80211_sta *sta,
1213 struct sk_buff_head *skbs,
1216 struct sk_buff *skb, *tmp;
1217 struct ieee80211_tx_info *info;
1218 unsigned long flags;
1220 skb_queue_walk_safe(skbs, skb, tmp) {
1221 int q = skb_get_queue_mapping(skb);
1223 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1224 if (local->queue_stop_reasons[q] ||
1225 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1227 * Since queue is stopped, queue up frames for later
1228 * transmission from the tx-pending tasklet when the
1229 * queue is woken again.
1232 skb_queue_splice_init(skbs, &local->pending[q]);
1234 skb_queue_splice_tail_init(skbs,
1235 &local->pending[q]);
1237 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1241 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1243 info = IEEE80211_SKB_CB(skb);
1244 info->control.vif = vif;
1245 info->control.sta = sta;
1247 __skb_unlink(skb, skbs);
1255 * Returns false if the frame couldn't be transmitted but was queued instead.
1257 static bool __ieee80211_tx(struct ieee80211_local *local,
1258 struct sk_buff_head *skbs, int led_len,
1259 struct sta_info *sta, bool txpending)
1261 struct ieee80211_tx_info *info;
1262 struct ieee80211_sub_if_data *sdata;
1263 struct ieee80211_vif *vif;
1264 struct ieee80211_sta *pubsta;
1265 struct sk_buff *skb;
1269 if (WARN_ON(skb_queue_empty(skbs)))
1272 skb = skb_peek(skbs);
1273 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1274 info = IEEE80211_SKB_CB(skb);
1275 sdata = vif_to_sdata(info->control.vif);
1276 if (sta && !sta->uploaded)
1284 switch (sdata->vif.type) {
1285 case NL80211_IFTYPE_MONITOR:
1289 case NL80211_IFTYPE_AP_VLAN:
1290 sdata = container_of(sdata->bss,
1291 struct ieee80211_sub_if_data, u.ap);
1298 if (local->ops->tx_frags)
1299 drv_tx_frags(local, vif, pubsta, skbs);
1301 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1304 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1305 ieee80211_led_tx(local, 1);
1307 WARN_ON_ONCE(!skb_queue_empty(skbs));
1313 * Invoke TX handlers, return 0 on success and non-zero if the
1314 * frame was dropped or queued.
1316 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1318 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1319 ieee80211_tx_result res = TX_DROP;
1321 #define CALL_TXH(txh) \
1324 if (res != TX_CONTINUE) \
1328 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1329 CALL_TXH(ieee80211_tx_h_check_assoc);
1330 CALL_TXH(ieee80211_tx_h_ps_buf);
1331 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1332 CALL_TXH(ieee80211_tx_h_select_key);
1333 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1334 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1336 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1337 __skb_queue_tail(&tx->skbs, tx->skb);
1342 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1343 CALL_TXH(ieee80211_tx_h_sequence);
1344 CALL_TXH(ieee80211_tx_h_fragment);
1345 /* handlers after fragment must be aware of tx info fragmentation! */
1346 CALL_TXH(ieee80211_tx_h_stats);
1347 CALL_TXH(ieee80211_tx_h_encrypt);
1348 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1349 CALL_TXH(ieee80211_tx_h_calculate_duration);
1353 if (unlikely(res == TX_DROP)) {
1354 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1356 dev_kfree_skb(tx->skb);
1358 __skb_queue_purge(&tx->skbs);
1360 } else if (unlikely(res == TX_QUEUED)) {
1361 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1369 * Returns false if the frame couldn't be transmitted but was queued instead.
1371 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1372 struct sk_buff *skb, bool txpending)
1374 struct ieee80211_local *local = sdata->local;
1375 struct ieee80211_tx_data tx;
1376 ieee80211_tx_result res_prepare;
1377 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1381 if (unlikely(skb->len < 10)) {
1388 /* initialises tx */
1390 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1392 if (unlikely(res_prepare == TX_DROP)) {
1395 } else if (unlikely(res_prepare == TX_QUEUED)) {
1399 tx.channel = local->hw.conf.channel;
1400 info->band = tx.channel->band;
1402 if (!invoke_tx_handlers(&tx))
1403 result = __ieee80211_tx(local, &tx.skbs, led_len,
1410 /* device xmit handlers */
1412 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1413 struct sk_buff *skb,
1414 int head_need, bool may_encrypt)
1416 struct ieee80211_local *local = sdata->local;
1419 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1420 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1421 tail_need -= skb_tailroom(skb);
1422 tail_need = max_t(int, tail_need, 0);
1425 if (skb_cloned(skb))
1426 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1427 else if (head_need || tail_need)
1428 I802_DEBUG_INC(local->tx_expand_skb_head);
1432 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1433 wiphy_debug(local->hw.wiphy,
1434 "failed to reallocate TX buffer\n");
1441 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1443 struct ieee80211_local *local = sdata->local;
1444 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1445 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1451 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1453 headroom = local->tx_headroom;
1455 headroom += IEEE80211_ENCRYPT_HEADROOM;
1456 headroom -= skb_headroom(skb);
1457 headroom = max_t(int, 0, headroom);
1459 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1465 hdr = (struct ieee80211_hdr *) skb->data;
1466 info->control.vif = &sdata->vif;
1468 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1469 ieee80211_is_data(hdr->frame_control) &&
1470 !is_multicast_ether_addr(hdr->addr1) &&
1471 mesh_nexthop_resolve(skb, sdata)) {
1472 /* skb queued: don't free */
1477 ieee80211_set_qos_hdr(sdata, skb);
1478 ieee80211_tx(sdata, skb, false);
1482 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1484 struct ieee80211_radiotap_iterator iterator;
1485 struct ieee80211_radiotap_header *rthdr =
1486 (struct ieee80211_radiotap_header *) skb->data;
1487 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1488 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1492 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1493 IEEE80211_TX_CTL_DONTFRAG;
1496 * for every radiotap entry that is present
1497 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1498 * entries present, or -EINVAL on error)
1502 ret = ieee80211_radiotap_iterator_next(&iterator);
1507 /* see if this argument is something we can use */
1508 switch (iterator.this_arg_index) {
1510 * You must take care when dereferencing iterator.this_arg
1511 * for multibyte types... the pointer is not aligned. Use
1512 * get_unaligned((type *)iterator.this_arg) to dereference
1513 * iterator.this_arg for type "type" safely on all arches.
1515 case IEEE80211_RADIOTAP_FLAGS:
1516 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1518 * this indicates that the skb we have been
1519 * handed has the 32-bit FCS CRC at the end...
1520 * we should react to that by snipping it off
1521 * because it will be recomputed and added
1524 if (skb->len < (iterator._max_length + FCS_LEN))
1527 skb_trim(skb, skb->len - FCS_LEN);
1529 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1530 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1531 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1532 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1535 case IEEE80211_RADIOTAP_TX_FLAGS:
1536 txflags = get_unaligned_le16(iterator.this_arg);
1537 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1538 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1542 * Please update the file
1543 * Documentation/networking/mac80211-injection.txt
1544 * when parsing new fields here.
1552 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1556 * remove the radiotap header
1557 * iterator->_max_length was sanity-checked against
1558 * skb->len by iterator init
1560 skb_pull(skb, iterator._max_length);
1565 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1566 struct net_device *dev)
1568 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1569 struct ieee80211_channel *chan = local->hw.conf.channel;
1570 struct ieee80211_radiotap_header *prthdr =
1571 (struct ieee80211_radiotap_header *)skb->data;
1572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1573 struct ieee80211_hdr *hdr;
1574 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1579 * Frame injection is not allowed if beaconing is not allowed
1580 * or if we need radar detection. Beaconing is usually not allowed when
1581 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1582 * Passive scan is also used in world regulatory domains where
1583 * your country is not known and as such it should be treated as
1584 * NO TX unless the channel is explicitly allowed in which case
1585 * your current regulatory domain would not have the passive scan
1588 * Since AP mode uses monitor interfaces to inject/TX management
1589 * frames we can make AP mode the exception to this rule once it
1590 * supports radar detection as its implementation can deal with
1591 * radar detection by itself. We can do that later by adding a
1592 * monitor flag interfaces used for AP support.
1594 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1595 IEEE80211_CHAN_PASSIVE_SCAN)))
1598 /* check for not even having the fixed radiotap header part */
1599 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1600 goto fail; /* too short to be possibly valid */
1602 /* is it a header version we can trust to find length from? */
1603 if (unlikely(prthdr->it_version))
1604 goto fail; /* only version 0 is supported */
1606 /* then there must be a radiotap header with a length we can use */
1607 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1609 /* does the skb contain enough to deliver on the alleged length? */
1610 if (unlikely(skb->len < len_rthdr))
1611 goto fail; /* skb too short for claimed rt header extent */
1614 * fix up the pointers accounting for the radiotap
1615 * header still being in there. We are being given
1616 * a precooked IEEE80211 header so no need for
1619 skb_set_mac_header(skb, len_rthdr);
1621 * these are just fixed to the end of the rt area since we
1622 * don't have any better information and at this point, nobody cares
1624 skb_set_network_header(skb, len_rthdr);
1625 skb_set_transport_header(skb, len_rthdr);
1627 if (skb->len < len_rthdr + 2)
1630 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1631 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1633 if (skb->len < len_rthdr + hdrlen)
1637 * Initialize skb->protocol if the injected frame is a data frame
1638 * carrying a rfc1042 header
1640 if (ieee80211_is_data(hdr->frame_control) &&
1641 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1642 u8 *payload = (u8 *)hdr + hdrlen;
1644 if (compare_ether_addr(payload, rfc1042_header) == 0)
1645 skb->protocol = cpu_to_be16((payload[6] << 8) |
1649 memset(info, 0, sizeof(*info));
1651 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1652 IEEE80211_TX_CTL_INJECTED;
1654 /* process and remove the injection radiotap header */
1655 if (!ieee80211_parse_tx_radiotap(skb))
1661 * We process outgoing injected frames that have a local address
1662 * we handle as though they are non-injected frames.
1663 * This code here isn't entirely correct, the local MAC address
1664 * isn't always enough to find the interface to use; for proper
1665 * VLAN/WDS support we will need a different mechanism (which
1666 * likely isn't going to be monitor interfaces).
1668 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1670 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1671 if (!ieee80211_sdata_running(tmp_sdata))
1673 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1674 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1675 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1677 if (compare_ether_addr(tmp_sdata->vif.addr, hdr->addr2) == 0) {
1683 ieee80211_xmit(sdata, skb);
1686 return NETDEV_TX_OK;
1690 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1694 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1695 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1696 * @skb: packet to be sent
1697 * @dev: incoming interface
1699 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1700 * not be freed, and caller is responsible for either retrying later or freeing
1703 * This function takes in an Ethernet header and encapsulates it with suitable
1704 * IEEE 802.11 header based on which interface the packet is coming in. The
1705 * encapsulated packet will then be passed to master interface, wlan#.11, for
1706 * transmission (through low-level driver).
1708 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1709 struct net_device *dev)
1711 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1712 struct ieee80211_local *local = sdata->local;
1713 struct ieee80211_tx_info *info;
1714 int ret = NETDEV_TX_BUSY, head_need;
1715 u16 ethertype, hdrlen, meshhdrlen = 0;
1717 struct ieee80211_hdr hdr;
1718 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1719 struct mesh_path __maybe_unused *mppath = NULL;
1720 const u8 *encaps_data;
1721 int encaps_len, skip_header_bytes;
1723 struct sta_info *sta = NULL;
1724 bool wme_sta = false, authorized = false, tdls_auth = false;
1725 bool tdls_direct = false;
1730 if (unlikely(skb->len < ETH_HLEN)) {
1735 /* convert Ethernet header to proper 802.11 header (based on
1736 * operation mode) */
1737 ethertype = (skb->data[12] << 8) | skb->data[13];
1738 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1740 switch (sdata->vif.type) {
1741 case NL80211_IFTYPE_AP_VLAN:
1743 sta = rcu_dereference(sdata->u.vlan.sta);
1745 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1747 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1748 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1749 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1750 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1752 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1753 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1759 case NL80211_IFTYPE_AP:
1760 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1762 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1763 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1764 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1767 case NL80211_IFTYPE_WDS:
1768 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1770 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1771 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1772 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1773 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1776 #ifdef CONFIG_MAC80211_MESH
1777 case NL80211_IFTYPE_MESH_POINT:
1778 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1779 /* Do not send frames with mesh_ttl == 0 */
1780 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1785 if (!is_multicast_ether_addr(skb->data))
1786 mppath = mpp_path_lookup(skb->data, sdata);
1789 * Use address extension if it is a packet from
1790 * another interface or if we know the destination
1791 * is being proxied by a portal (i.e. portal address
1792 * differs from proxied address)
1794 if (compare_ether_addr(sdata->vif.addr,
1795 skb->data + ETH_ALEN) == 0 &&
1796 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
1797 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1798 skb->data, skb->data + ETH_ALEN);
1800 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1803 int is_mesh_mcast = 1;
1806 if (is_multicast_ether_addr(skb->data))
1807 /* DA TA mSA AE:SA */
1808 mesh_da = skb->data;
1810 static const u8 bcast[ETH_ALEN] =
1811 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1813 /* RA TA mDA mSA AE:DA SA */
1814 mesh_da = mppath->mpp;
1817 /* DA TA mSA AE:SA */
1821 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1822 mesh_da, sdata->vif.addr);
1826 ieee80211_new_mesh_header(&mesh_hdr,
1828 skb->data + ETH_ALEN,
1832 ieee80211_new_mesh_header(&mesh_hdr,
1835 skb->data + ETH_ALEN);
1840 case NL80211_IFTYPE_STATION:
1841 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1842 bool tdls_peer = false;
1845 sta = sta_info_get(sdata, skb->data);
1847 authorized = test_sta_flag(sta,
1848 WLAN_STA_AUTHORIZED);
1849 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1850 tdls_peer = test_sta_flag(sta,
1851 WLAN_STA_TDLS_PEER);
1852 tdls_auth = test_sta_flag(sta,
1853 WLAN_STA_TDLS_PEER_AUTH);
1858 * If the TDLS link is enabled, send everything
1859 * directly. Otherwise, allow TDLS setup frames
1860 * to be transmitted indirectly.
1862 tdls_direct = tdls_peer && (tdls_auth ||
1863 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1864 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1868 /* link during setup - throw out frames to peer */
1875 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1876 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1877 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1879 } else if (sdata->u.mgd.use_4addr &&
1880 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1881 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1882 IEEE80211_FCTL_TODS);
1884 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1885 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1886 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1887 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1890 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1892 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1893 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1894 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1898 case NL80211_IFTYPE_ADHOC:
1900 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1901 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1902 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1911 * There's no need to try to look up the destination
1912 * if it is a multicast address (which can only happen
1915 multicast = is_multicast_ether_addr(hdr.addr1);
1918 sta = sta_info_get(sdata, hdr.addr1);
1920 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1921 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1926 /* For mesh, the use of the QoS header is mandatory */
1927 if (ieee80211_vif_is_mesh(&sdata->vif))
1930 /* receiver and we are QoS enabled, use a QoS type frame */
1931 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1932 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1937 * Drop unicast frames to unauthorised stations unless they are
1938 * EAPOL frames from the local station.
1940 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1941 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1942 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1943 compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1944 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1945 if (net_ratelimit())
1946 printk(KERN_DEBUG "%s: dropped frame to %pM"
1947 " (unauthorized port)\n", dev->name,
1951 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1957 if (unlikely(!multicast && skb->sk &&
1958 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1959 struct sk_buff *orig_skb = skb;
1961 skb = skb_clone(skb, GFP_ATOMIC);
1963 unsigned long flags;
1966 spin_lock_irqsave(&local->ack_status_lock, flags);
1967 r = idr_get_new_above(&local->ack_status_frames,
1970 idr_pre_get(&local->ack_status_frames,
1972 r = idr_get_new_above(&local->ack_status_frames,
1975 if (WARN_ON(!id) || id > 0xffff) {
1976 idr_remove(&local->ack_status_frames, id);
1979 spin_unlock_irqrestore(&local->ack_status_lock, flags);
1983 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1984 } else if (skb_shared(skb)) {
1985 kfree_skb(orig_skb);
1991 /* couldn't clone -- lose tx status ... */
1997 * If the skb is shared we need to obtain our own copy.
1999 if (skb_shared(skb)) {
2000 struct sk_buff *tmp_skb = skb;
2002 /* can't happen -- skb is a clone if info_id != 0 */
2005 skb = skb_clone(skb, GFP_ATOMIC);
2014 hdr.frame_control = fc;
2015 hdr.duration_id = 0;
2018 skip_header_bytes = ETH_HLEN;
2019 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2020 encaps_data = bridge_tunnel_header;
2021 encaps_len = sizeof(bridge_tunnel_header);
2022 skip_header_bytes -= 2;
2023 } else if (ethertype >= 0x600) {
2024 encaps_data = rfc1042_header;
2025 encaps_len = sizeof(rfc1042_header);
2026 skip_header_bytes -= 2;
2032 nh_pos = skb_network_header(skb) - skb->data;
2033 h_pos = skb_transport_header(skb) - skb->data;
2035 skb_pull(skb, skip_header_bytes);
2036 nh_pos -= skip_header_bytes;
2037 h_pos -= skip_header_bytes;
2039 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2042 * So we need to modify the skb header and hence need a copy of
2043 * that. The head_need variable above doesn't, so far, include
2044 * the needed header space that we don't need right away. If we
2045 * can, then we don't reallocate right now but only after the
2046 * frame arrives at the master device (if it does...)
2048 * If we cannot, however, then we will reallocate to include all
2049 * the ever needed space. Also, if we need to reallocate it anyway,
2050 * make it big enough for everything we may ever need.
2053 if (head_need > 0 || skb_cloned(skb)) {
2054 head_need += IEEE80211_ENCRYPT_HEADROOM;
2055 head_need += local->tx_headroom;
2056 head_need = max_t(int, 0, head_need);
2057 if (ieee80211_skb_resize(sdata, skb, head_need, true))
2062 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2063 nh_pos += encaps_len;
2064 h_pos += encaps_len;
2067 #ifdef CONFIG_MAC80211_MESH
2068 if (meshhdrlen > 0) {
2069 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2070 nh_pos += meshhdrlen;
2071 h_pos += meshhdrlen;
2075 if (ieee80211_is_data_qos(fc)) {
2076 __le16 *qos_control;
2078 qos_control = (__le16*) skb_push(skb, 2);
2079 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2081 * Maybe we could actually set some fields here, for now just
2082 * initialise to zero to indicate no special operation.
2086 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2091 dev->stats.tx_packets++;
2092 dev->stats.tx_bytes += skb->len;
2094 /* Update skb pointers to various headers since this modified frame
2095 * is going to go through Linux networking code that may potentially
2096 * need things like pointer to IP header. */
2097 skb_set_mac_header(skb, 0);
2098 skb_set_network_header(skb, nh_pos);
2099 skb_set_transport_header(skb, h_pos);
2101 info = IEEE80211_SKB_CB(skb);
2102 memset(info, 0, sizeof(*info));
2104 dev->trans_start = jiffies;
2106 info->flags = info_flags;
2107 info->ack_frame_id = info_id;
2109 ieee80211_xmit(sdata, skb);
2111 return NETDEV_TX_OK;
2114 if (ret == NETDEV_TX_OK)
2122 * ieee80211_clear_tx_pending may not be called in a context where
2123 * it is possible that it packets could come in again.
2125 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2129 for (i = 0; i < local->hw.queues; i++)
2130 skb_queue_purge(&local->pending[i]);
2134 * Returns false if the frame couldn't be transmitted but was queued instead,
2135 * which in this case means re-queued -- take as an indication to stop sending
2136 * more pending frames.
2138 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2139 struct sk_buff *skb)
2141 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2142 struct ieee80211_sub_if_data *sdata;
2143 struct sta_info *sta;
2144 struct ieee80211_hdr *hdr;
2147 sdata = vif_to_sdata(info->control.vif);
2149 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2150 result = ieee80211_tx(sdata, skb, true);
2152 struct sk_buff_head skbs;
2154 __skb_queue_head_init(&skbs);
2155 __skb_queue_tail(&skbs, skb);
2157 hdr = (struct ieee80211_hdr *)skb->data;
2158 sta = sta_info_get(sdata, hdr->addr1);
2160 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2167 * Transmit all pending packets. Called from tasklet.
2169 void ieee80211_tx_pending(unsigned long data)
2171 struct ieee80211_local *local = (struct ieee80211_local *)data;
2172 struct ieee80211_sub_if_data *sdata;
2173 unsigned long flags;
2179 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2180 for (i = 0; i < local->hw.queues; i++) {
2182 * If queue is stopped by something other than due to pending
2183 * frames, or we have no pending frames, proceed to next queue.
2185 if (local->queue_stop_reasons[i] ||
2186 skb_queue_empty(&local->pending[i]))
2189 while (!skb_queue_empty(&local->pending[i])) {
2190 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2191 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2193 if (WARN_ON(!info->control.vif)) {
2198 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2201 txok = ieee80211_tx_pending_skb(local, skb);
2202 spin_lock_irqsave(&local->queue_stop_reason_lock,
2208 if (skb_queue_empty(&local->pending[i]))
2209 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2210 netif_wake_subqueue(sdata->dev, i);
2212 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2217 /* functions for drivers to get certain frames */
2219 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2220 struct ieee80211_if_ap *bss,
2221 struct sk_buff *skb,
2222 struct beacon_data *beacon)
2226 int i, have_bits = 0, n1, n2;
2228 /* Generate bitmap for TIM only if there are any STAs in power save
2230 if (atomic_read(&bss->num_sta_ps) > 0)
2231 /* in the hope that this is faster than
2232 * checking byte-for-byte */
2233 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2234 IEEE80211_MAX_AID+1);
2236 if (bss->dtim_count == 0)
2237 bss->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2241 tim = pos = (u8 *) skb_put(skb, 6);
2242 *pos++ = WLAN_EID_TIM;
2244 *pos++ = bss->dtim_count;
2245 *pos++ = sdata->vif.bss_conf.dtim_period;
2247 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2250 bss->dtim_bc_mc = aid0 == 1;
2253 /* Find largest even number N1 so that bits numbered 1 through
2254 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2255 * (N2 + 1) x 8 through 2007 are 0. */
2257 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2264 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2271 /* Bitmap control */
2273 /* Part Virt Bitmap */
2274 skb_put(skb, n2 - n1);
2275 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2277 tim[1] = n2 - n1 + 4;
2279 *pos++ = aid0; /* Bitmap control */
2280 *pos++ = 0; /* Part Virt Bitmap */
2284 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2285 struct ieee80211_vif *vif,
2286 u16 *tim_offset, u16 *tim_length)
2288 struct ieee80211_local *local = hw_to_local(hw);
2289 struct sk_buff *skb = NULL;
2290 struct ieee80211_tx_info *info;
2291 struct ieee80211_sub_if_data *sdata = NULL;
2292 struct ieee80211_if_ap *ap = NULL;
2293 struct beacon_data *beacon;
2294 struct ieee80211_supported_band *sband;
2295 enum ieee80211_band band = local->hw.conf.channel->band;
2296 struct ieee80211_tx_rate_control txrc;
2298 sband = local->hw.wiphy->bands[band];
2302 sdata = vif_to_sdata(vif);
2304 if (!ieee80211_sdata_running(sdata))
2312 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2314 beacon = rcu_dereference(ap->beacon);
2317 * headroom, head length,
2318 * tail length and maximum TIM length
2320 skb = dev_alloc_skb(local->tx_headroom +
2322 beacon->tail_len + 256);
2326 skb_reserve(skb, local->tx_headroom);
2327 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2331 * Not very nice, but we want to allow the driver to call
2332 * ieee80211_beacon_get() as a response to the set_tim()
2333 * callback. That, however, is already invoked under the
2334 * sta_lock to guarantee consistent and race-free update
2335 * of the tim bitmap in mac80211 and the driver.
2337 if (local->tim_in_locked_section) {
2338 ieee80211_beacon_add_tim(sdata, ap, skb,
2341 unsigned long flags;
2343 spin_lock_irqsave(&local->tim_lock, flags);
2344 ieee80211_beacon_add_tim(sdata, ap, skb,
2346 spin_unlock_irqrestore(&local->tim_lock, flags);
2350 *tim_offset = beacon->head_len;
2352 *tim_length = skb->len - beacon->head_len;
2355 memcpy(skb_put(skb, beacon->tail_len),
2356 beacon->tail, beacon->tail_len);
2359 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2360 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2361 struct ieee80211_hdr *hdr;
2362 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2367 skb = skb_copy(presp, GFP_ATOMIC);
2371 hdr = (struct ieee80211_hdr *) skb->data;
2372 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2373 IEEE80211_STYPE_BEACON);
2374 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2375 struct ieee80211_mgmt *mgmt;
2376 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2378 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
2379 sizeof(mgmt->u.beacon);
2381 #ifdef CONFIG_MAC80211_MESH
2382 if (!sdata->u.mesh.mesh_id_len)
2386 if (ifmsh->sync_ops)
2387 ifmsh->sync_ops->adjust_tbtt(
2390 skb = dev_alloc_skb(local->tx_headroom +
2393 2 + 8 + /* supported rates */
2394 2 + 3 + /* DS params */
2395 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
2396 2 + sizeof(struct ieee80211_ht_cap) +
2397 2 + sizeof(struct ieee80211_ht_operation) +
2398 2 + sdata->u.mesh.mesh_id_len +
2399 2 + sizeof(struct ieee80211_meshconf_ie) +
2400 sdata->u.mesh.ie_len);
2404 skb_reserve(skb, local->hw.extra_tx_headroom);
2405 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
2406 memset(mgmt, 0, hdr_len);
2407 mgmt->frame_control =
2408 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2409 memset(mgmt->da, 0xff, ETH_ALEN);
2410 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2411 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2412 mgmt->u.beacon.beacon_int =
2413 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2414 mgmt->u.beacon.capab_info |= cpu_to_le16(
2415 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
2417 pos = skb_put(skb, 2);
2418 *pos++ = WLAN_EID_SSID;
2421 if (ieee80211_add_srates_ie(&sdata->vif, skb) ||
2422 mesh_add_ds_params_ie(skb, sdata) ||
2423 ieee80211_add_ext_srates_ie(&sdata->vif, skb) ||
2424 mesh_add_rsn_ie(skb, sdata) ||
2425 mesh_add_ht_cap_ie(skb, sdata) ||
2426 mesh_add_ht_oper_ie(skb, sdata) ||
2427 mesh_add_meshid_ie(skb, sdata) ||
2428 mesh_add_meshconf_ie(skb, sdata) ||
2429 mesh_add_vendor_ies(skb, sdata)) {
2430 pr_err("o11s: couldn't add ies!\n");
2438 info = IEEE80211_SKB_CB(skb);
2440 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2441 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2444 memset(&txrc, 0, sizeof(txrc));
2447 txrc.bss_conf = &sdata->vif.bss_conf;
2449 txrc.reported_rate.idx = -1;
2450 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2451 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2452 txrc.max_rate_idx = -1;
2454 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2455 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band],
2456 sizeof(txrc.rate_idx_mcs_mask));
2458 rate_control_get_rate(sdata, NULL, &txrc);
2460 info->control.vif = vif;
2462 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2463 IEEE80211_TX_CTL_ASSIGN_SEQ |
2464 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2469 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2471 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2472 struct ieee80211_vif *vif)
2474 struct ieee80211_if_ap *ap = NULL;
2475 struct sk_buff *presp = NULL, *skb = NULL;
2476 struct ieee80211_hdr *hdr;
2477 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2479 if (sdata->vif.type != NL80211_IFTYPE_AP)
2485 presp = rcu_dereference(ap->probe_resp);
2489 skb = skb_copy(presp, GFP_ATOMIC);
2493 hdr = (struct ieee80211_hdr *) skb->data;
2494 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2500 EXPORT_SYMBOL(ieee80211_proberesp_get);
2502 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2503 struct ieee80211_vif *vif)
2505 struct ieee80211_sub_if_data *sdata;
2506 struct ieee80211_if_managed *ifmgd;
2507 struct ieee80211_pspoll *pspoll;
2508 struct ieee80211_local *local;
2509 struct sk_buff *skb;
2511 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2514 sdata = vif_to_sdata(vif);
2515 ifmgd = &sdata->u.mgd;
2516 local = sdata->local;
2518 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2522 skb_reserve(skb, local->hw.extra_tx_headroom);
2524 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2525 memset(pspoll, 0, sizeof(*pspoll));
2526 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2527 IEEE80211_STYPE_PSPOLL);
2528 pspoll->aid = cpu_to_le16(ifmgd->aid);
2530 /* aid in PS-Poll has its two MSBs each set to 1 */
2531 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2533 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2534 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2538 EXPORT_SYMBOL(ieee80211_pspoll_get);
2540 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2541 struct ieee80211_vif *vif)
2543 struct ieee80211_hdr_3addr *nullfunc;
2544 struct ieee80211_sub_if_data *sdata;
2545 struct ieee80211_if_managed *ifmgd;
2546 struct ieee80211_local *local;
2547 struct sk_buff *skb;
2549 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2552 sdata = vif_to_sdata(vif);
2553 ifmgd = &sdata->u.mgd;
2554 local = sdata->local;
2556 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2560 skb_reserve(skb, local->hw.extra_tx_headroom);
2562 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2564 memset(nullfunc, 0, sizeof(*nullfunc));
2565 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2566 IEEE80211_STYPE_NULLFUNC |
2567 IEEE80211_FCTL_TODS);
2568 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2569 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2570 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2574 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2576 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2577 struct ieee80211_vif *vif,
2578 const u8 *ssid, size_t ssid_len,
2579 const u8 *ie, size_t ie_len)
2581 struct ieee80211_sub_if_data *sdata;
2582 struct ieee80211_local *local;
2583 struct ieee80211_hdr_3addr *hdr;
2584 struct sk_buff *skb;
2588 sdata = vif_to_sdata(vif);
2589 local = sdata->local;
2590 ie_ssid_len = 2 + ssid_len;
2592 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2593 ie_ssid_len + ie_len);
2597 skb_reserve(skb, local->hw.extra_tx_headroom);
2599 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2600 memset(hdr, 0, sizeof(*hdr));
2601 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2602 IEEE80211_STYPE_PROBE_REQ);
2603 memset(hdr->addr1, 0xff, ETH_ALEN);
2604 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2605 memset(hdr->addr3, 0xff, ETH_ALEN);
2607 pos = skb_put(skb, ie_ssid_len);
2608 *pos++ = WLAN_EID_SSID;
2611 memcpy(pos, ssid, ssid_len);
2615 pos = skb_put(skb, ie_len);
2616 memcpy(pos, ie, ie_len);
2621 EXPORT_SYMBOL(ieee80211_probereq_get);
2623 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2624 const void *frame, size_t frame_len,
2625 const struct ieee80211_tx_info *frame_txctl,
2626 struct ieee80211_rts *rts)
2628 const struct ieee80211_hdr *hdr = frame;
2630 rts->frame_control =
2631 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2632 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2634 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2635 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2637 EXPORT_SYMBOL(ieee80211_rts_get);
2639 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2640 const void *frame, size_t frame_len,
2641 const struct ieee80211_tx_info *frame_txctl,
2642 struct ieee80211_cts *cts)
2644 const struct ieee80211_hdr *hdr = frame;
2646 cts->frame_control =
2647 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2648 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2649 frame_len, frame_txctl);
2650 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2652 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2655 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2656 struct ieee80211_vif *vif)
2658 struct ieee80211_local *local = hw_to_local(hw);
2659 struct sk_buff *skb = NULL;
2660 struct ieee80211_tx_data tx;
2661 struct ieee80211_sub_if_data *sdata;
2662 struct ieee80211_if_ap *bss = NULL;
2663 struct beacon_data *beacon;
2664 struct ieee80211_tx_info *info;
2666 sdata = vif_to_sdata(vif);
2670 beacon = rcu_dereference(bss->beacon);
2672 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2675 if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2676 goto out; /* send buffered bc/mc only after DTIM beacon */
2679 skb = skb_dequeue(&bss->ps_bc_buf);
2682 local->total_ps_buffered--;
2684 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2685 struct ieee80211_hdr *hdr =
2686 (struct ieee80211_hdr *) skb->data;
2687 /* more buffered multicast/broadcast frames ==> set
2688 * MoreData flag in IEEE 802.11 header to inform PS
2690 hdr->frame_control |=
2691 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2694 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2696 dev_kfree_skb_any(skb);
2699 info = IEEE80211_SKB_CB(skb);
2701 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2702 tx.channel = local->hw.conf.channel;
2703 info->band = tx.channel->band;
2705 if (invoke_tx_handlers(&tx))
2712 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2714 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
2715 struct sk_buff *skb, int tid)
2717 skb_set_mac_header(skb, 0);
2718 skb_set_network_header(skb, 0);
2719 skb_set_transport_header(skb, 0);
2721 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
2722 skb->priority = tid;
2725 * The other path calling ieee80211_xmit is from the tasklet,
2726 * and while we can handle concurrent transmissions locking
2727 * requirements are that we do not come into tx with bhs on.
2730 ieee80211_xmit(sdata, skb);