2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 * Transmit and frame generation functions.
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/etherdevice.h>
19 #include <linux/bitmap.h>
20 #include <linux/rcupdate.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <asm/unaligned.h>
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
36 #define IEEE80211_TX_OK 0
37 #define IEEE80211_TX_AGAIN 1
38 #define IEEE80211_TX_PENDING 2
42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr,
45 int rate, mrate, erp, dur, i;
46 struct ieee80211_rate *txrate;
47 struct ieee80211_local *local = tx->local;
48 struct ieee80211_supported_band *sband;
49 struct ieee80211_hdr *hdr;
50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
52 /* assume HW handles this */
53 if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
57 if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
60 sband = local->hw.wiphy->bands[tx->channel->band];
61 txrate = &sband->bitrates[info->control.rates[0].idx];
63 erp = txrate->flags & IEEE80211_RATE_ERP_G;
66 * data and mgmt (except PS Poll):
68 * - during contention period:
69 * if addr1 is group address: 0
70 * if more fragments = 0 and addr1 is individual address: time to
71 * transmit one ACK plus SIFS
72 * if more fragments = 1 and addr1 is individual address: time to
73 * transmit next fragment plus 2 x ACK plus 3 x SIFS
76 * - control response frame (CTS or ACK) shall be transmitted using the
77 * same rate as the immediately previous frame in the frame exchange
78 * sequence, if this rate belongs to the PHY mandatory rates, or else
79 * at the highest possible rate belonging to the PHY rates in the
82 hdr = (struct ieee80211_hdr *)tx->skb->data;
83 if (ieee80211_is_ctl(hdr->frame_control)) {
84 /* TODO: These control frames are not currently sent by
85 * mac80211, but should they be implemented, this function
86 * needs to be updated to support duration field calculation.
88 * RTS: time needed to transmit pending data/mgmt frame plus
89 * one CTS frame plus one ACK frame plus 3 x SIFS
90 * CTS: duration of immediately previous RTS minus time
91 * required to transmit CTS and its SIFS
92 * ACK: 0 if immediately previous directed data/mgmt had
93 * more=0, with more=1 duration in ACK frame is duration
94 * from previous frame minus time needed to transmit ACK
96 * PS Poll: BIT(15) | BIT(14) | aid
102 if (0 /* FIX: data/mgmt during CFP */)
103 return cpu_to_le16(32768);
105 if (group_addr) /* Group address as the destination - no ACK */
108 /* Individual destination address:
109 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
110 * CTS and ACK frames shall be transmitted using the highest rate in
111 * basic rate set that is less than or equal to the rate of the
112 * immediately previous frame and that is using the same modulation
113 * (CCK or OFDM). If no basic rate set matches with these requirements,
114 * the highest mandatory rate of the PHY that is less than or equal to
115 * the rate of the previous frame is used.
116 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
119 /* use lowest available if everything fails */
120 mrate = sband->bitrates[0].bitrate;
121 for (i = 0; i < sband->n_bitrates; i++) {
122 struct ieee80211_rate *r = &sband->bitrates[i];
124 if (r->bitrate > txrate->bitrate)
127 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
130 switch (sband->band) {
131 case IEEE80211_BAND_2GHZ: {
133 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
134 flag = IEEE80211_RATE_MANDATORY_G;
136 flag = IEEE80211_RATE_MANDATORY_B;
141 case IEEE80211_BAND_5GHZ:
142 if (r->flags & IEEE80211_RATE_MANDATORY_A)
145 case IEEE80211_NUM_BANDS:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Time needed to transmit ACK
157 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
158 * to closest integer */
160 dur = ieee80211_frame_duration(local, 10, rate, erp,
161 tx->sdata->vif.bss_conf.use_short_preamble);
164 /* Frame is fragmented: duration increases with time needed to
165 * transmit next fragment plus ACK and 2 x SIFS. */
166 dur *= 2; /* ACK + SIFS */
168 dur += ieee80211_frame_duration(local, next_frag_len,
169 txrate->bitrate, erp,
170 tx->sdata->vif.bss_conf.use_short_preamble);
173 return cpu_to_le16(dur);
176 static int inline is_ieee80211_device(struct ieee80211_local *local,
177 struct net_device *dev)
179 return local == wdev_priv(dev->ieee80211_ptr);
183 static ieee80211_tx_result debug_noinline
184 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
186 struct ieee80211_local *local = tx->local;
187 struct ieee80211_if_managed *ifmgd;
189 /* driver doesn't support power save */
190 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
193 /* hardware does dynamic power save */
194 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
197 /* dynamic power save disabled */
198 if (local->hw.conf.dynamic_ps_timeout <= 0)
201 /* we are scanning, don't enable power save */
205 if (!local->ps_sdata)
208 /* No point if we're going to suspend */
209 if (local->quiescing)
212 /* dynamic ps is supported only in managed mode */
213 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
216 ifmgd = &tx->sdata->u.mgd;
219 * Don't wakeup from power save if u-apsd is enabled, voip ac has
220 * u-apsd enabled and the frame is in voip class. This effectively
221 * means that even if all access categories have u-apsd enabled, in
222 * practise u-apsd is only used with the voip ac. This is a
223 * workaround for the case when received voip class packets do not
224 * have correct qos tag for some reason, due the network or the
227 * Note: local->uapsd_queues access is racy here. If the value is
228 * changed via debugfs, user needs to reassociate manually to have
229 * everything in sync.
231 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
232 && (local->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
233 && skb_get_queue_mapping(tx->skb) == 0)
236 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
237 ieee80211_stop_queues_by_reason(&local->hw,
238 IEEE80211_QUEUE_STOP_REASON_PS);
239 ieee80211_queue_work(&local->hw,
240 &local->dynamic_ps_disable_work);
243 mod_timer(&local->dynamic_ps_timer, jiffies +
244 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
249 static ieee80211_tx_result debug_noinline
250 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
253 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
254 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
257 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
260 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
261 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
262 !ieee80211_is_probe_req(hdr->frame_control) &&
263 !ieee80211_is_nullfunc(hdr->frame_control))
265 * When software scanning only nullfunc frames (to notify
266 * the sleep state to the AP) and probe requests (for the
267 * active scan) are allowed, all other frames should not be
268 * sent and we should not get here, but if we do
269 * nonetheless, drop them to avoid sending them
270 * off-channel. See the link below and
271 * ieee80211_start_scan() for more.
273 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
277 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
280 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
283 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
286 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
288 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
289 if (unlikely(!(sta_flags & WLAN_STA_ASSOC) &&
290 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC &&
291 ieee80211_is_data(hdr->frame_control))) {
292 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
293 printk(KERN_DEBUG "%s: dropped data frame to not "
294 "associated station %pM\n",
295 tx->sdata->name, hdr->addr1);
296 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
297 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
301 if (unlikely(ieee80211_is_data(hdr->frame_control) &&
302 tx->local->num_sta == 0 &&
303 tx->sdata->vif.type != NL80211_IFTYPE_ADHOC)) {
305 * No associated STAs - no need to send multicast
316 /* This function is called whenever the AP is about to exceed the maximum limit
317 * of buffered frames for power saving STAs. This situation should not really
318 * happen often during normal operation, so dropping the oldest buffered packet
319 * from each queue should be OK to make some room for new frames. */
320 static void purge_old_ps_buffers(struct ieee80211_local *local)
322 int total = 0, purged = 0;
324 struct ieee80211_sub_if_data *sdata;
325 struct sta_info *sta;
328 * virtual interfaces are protected by RCU
332 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
333 struct ieee80211_if_ap *ap;
334 if (sdata->vif.type != NL80211_IFTYPE_AP)
337 skb = skb_dequeue(&ap->ps_bc_buf);
342 total += skb_queue_len(&ap->ps_bc_buf);
345 list_for_each_entry_rcu(sta, &local->sta_list, list) {
346 skb = skb_dequeue(&sta->ps_tx_buf);
351 total += skb_queue_len(&sta->ps_tx_buf);
356 local->total_ps_buffered = total;
357 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
358 wiphy_debug(local->hw.wiphy, "PS buffers full - purged %d frames\n",
363 static ieee80211_tx_result
364 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
366 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
367 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
370 * broadcast/multicast frame
372 * If any of the associated stations is in power save mode,
373 * the frame is buffered to be sent after DTIM beacon frame.
374 * This is done either by the hardware or us.
377 /* powersaving STAs only in AP/VLAN mode */
381 /* no buffering for ordered frames */
382 if (ieee80211_has_order(hdr->frame_control))
385 /* no stations in PS mode */
386 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
389 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
391 /* device releases frame after DTIM beacon */
392 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
395 /* buffered in mac80211 */
396 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
397 purge_old_ps_buffers(tx->local);
399 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
400 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
402 printk(KERN_DEBUG "%s: BC TX buffer full - dropping the oldest frame\n",
405 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
407 tx->local->total_ps_buffered++;
409 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
414 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
417 if (!ieee80211_is_mgmt(fc))
420 if (sta == NULL || !test_sta_flags(sta, WLAN_STA_MFP))
423 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
430 static ieee80211_tx_result
431 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
433 struct sta_info *sta = tx->sta;
434 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
435 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
436 struct ieee80211_local *local = tx->local;
440 ieee80211_is_probe_resp(hdr->frame_control) ||
441 ieee80211_is_auth(hdr->frame_control) ||
442 ieee80211_is_assoc_resp(hdr->frame_control) ||
443 ieee80211_is_reassoc_resp(hdr->frame_control)))
446 staflags = get_sta_flags(sta);
448 if (unlikely((staflags & (WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) &&
449 !(info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE))) {
450 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
451 printk(KERN_DEBUG "STA %pM aid %d: PS buffer (entries "
453 sta->sta.addr, sta->sta.aid,
454 skb_queue_len(&sta->ps_tx_buf));
455 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
456 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
457 purge_old_ps_buffers(tx->local);
458 if (skb_queue_len(&sta->ps_tx_buf) >= STA_MAX_TX_BUFFER) {
459 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf);
460 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
461 if (net_ratelimit()) {
462 printk(KERN_DEBUG "%s: STA %pM TX "
463 "buffer full - dropping oldest frame\n",
464 tx->sdata->name, sta->sta.addr);
469 tx->local->total_ps_buffered++;
472 * Queue frame to be sent after STA wakes up/polls,
473 * but don't set the TIM bit if the driver is blocking
474 * wakeup or poll response transmissions anyway.
476 if (skb_queue_empty(&sta->ps_tx_buf) &&
477 !(staflags & WLAN_STA_PS_DRIVER))
478 sta_info_set_tim_bit(sta);
480 info->control.jiffies = jiffies;
481 info->control.vif = &tx->sdata->vif;
482 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
483 skb_queue_tail(&sta->ps_tx_buf, tx->skb);
485 if (!timer_pending(&local->sta_cleanup))
486 mod_timer(&local->sta_cleanup,
487 round_jiffies(jiffies +
488 STA_INFO_CLEANUP_INTERVAL));
492 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
493 else if (unlikely(staflags & WLAN_STA_PS_STA)) {
494 printk(KERN_DEBUG "%s: STA %pM in PS mode, but pspoll "
495 "set -> send frame\n", tx->sdata->name,
498 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
503 static ieee80211_tx_result debug_noinline
504 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
506 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
509 if (tx->flags & IEEE80211_TX_UNICAST)
510 return ieee80211_tx_h_unicast_ps_buf(tx);
512 return ieee80211_tx_h_multicast_ps_buf(tx);
515 static ieee80211_tx_result debug_noinline
516 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
518 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
520 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
521 tx->sdata->control_port_no_encrypt))
522 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
527 static ieee80211_tx_result debug_noinline
528 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
530 struct ieee80211_key *key = NULL;
531 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
532 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
534 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
536 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
538 else if (ieee80211_is_mgmt(hdr->frame_control) &&
539 is_multicast_ether_addr(hdr->addr1) &&
540 ieee80211_is_robust_mgmt_frame(hdr) &&
541 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
543 else if (is_multicast_ether_addr(hdr->addr1) &&
544 (key = rcu_dereference(tx->sdata->default_multicast_key)))
546 else if (!is_multicast_ether_addr(hdr->addr1) &&
547 (key = rcu_dereference(tx->sdata->default_unicast_key)))
549 else if (tx->sdata->drop_unencrypted &&
550 (tx->skb->protocol != tx->sdata->control_port_protocol) &&
551 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
552 (!ieee80211_is_robust_mgmt_frame(hdr) ||
553 (ieee80211_is_action(hdr->frame_control) &&
554 tx->sta && test_sta_flags(tx->sta, WLAN_STA_MFP)))) {
555 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
561 bool skip_hw = false;
563 tx->key->tx_rx_count++;
564 /* TODO: add threshold stuff again */
566 switch (tx->key->conf.cipher) {
567 case WLAN_CIPHER_SUITE_WEP40:
568 case WLAN_CIPHER_SUITE_WEP104:
569 if (ieee80211_is_auth(hdr->frame_control))
571 case WLAN_CIPHER_SUITE_TKIP:
572 if (!ieee80211_is_data_present(hdr->frame_control))
575 case WLAN_CIPHER_SUITE_CCMP:
576 if (!ieee80211_is_data_present(hdr->frame_control) &&
577 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
581 skip_hw = (tx->key->conf.flags &
582 IEEE80211_KEY_FLAG_SW_MGMT) &&
583 ieee80211_is_mgmt(hdr->frame_control);
585 case WLAN_CIPHER_SUITE_AES_CMAC:
586 if (!ieee80211_is_mgmt(hdr->frame_control))
591 if (!skip_hw && tx->key &&
592 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
593 info->control.hw_key = &tx->key->conf;
599 static ieee80211_tx_result debug_noinline
600 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
602 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
603 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
604 struct ieee80211_supported_band *sband;
605 struct ieee80211_rate *rate;
608 bool inval = false, rts = false, short_preamble = false;
609 struct ieee80211_tx_rate_control txrc;
612 memset(&txrc, 0, sizeof(txrc));
614 sband = tx->local->hw.wiphy->bands[tx->channel->band];
616 len = min_t(u32, tx->skb->len + FCS_LEN,
617 tx->local->hw.wiphy->frag_threshold);
619 /* set up the tx rate control struct we give the RC algo */
620 txrc.hw = local_to_hw(tx->local);
622 txrc.bss_conf = &tx->sdata->vif.bss_conf;
624 txrc.reported_rate.idx = -1;
625 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
626 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
627 txrc.max_rate_idx = -1;
629 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
630 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
631 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
633 /* set up RTS protection if desired */
634 if (len > tx->local->hw.wiphy->rts_threshold) {
635 txrc.rts = rts = true;
639 * Use short preamble if the BSS can handle it, but not for
640 * management frames unless we know the receiver can handle
641 * that -- the management frame might be to a station that
642 * just wants a probe response.
644 if (tx->sdata->vif.bss_conf.use_short_preamble &&
645 (ieee80211_is_data(hdr->frame_control) ||
646 (tx->sta && test_sta_flags(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
647 txrc.short_preamble = short_preamble = true;
649 sta_flags = tx->sta ? get_sta_flags(tx->sta) : 0;
652 * Lets not bother rate control if we're associated and cannot
653 * talk to the sta. This should not happen.
655 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) &&
656 (sta_flags & WLAN_STA_ASSOC) &&
657 !rate_usable_index_exists(sband, &tx->sta->sta),
658 "%s: Dropped data frame as no usable bitrate found while "
659 "scanning and associated. Target station: "
660 "%pM on %d GHz band\n",
661 tx->sdata->name, hdr->addr1,
662 tx->channel->band ? 5 : 2))
666 * If we're associated with the sta at this point we know we can at
667 * least send the frame at the lowest bit rate.
669 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
671 if (unlikely(info->control.rates[0].idx < 0))
674 if (txrc.reported_rate.idx < 0) {
675 txrc.reported_rate = info->control.rates[0];
676 if (tx->sta && ieee80211_is_data(hdr->frame_control))
677 tx->sta->last_tx_rate = txrc.reported_rate;
679 tx->sta->last_tx_rate = txrc.reported_rate;
681 if (unlikely(!info->control.rates[0].count))
682 info->control.rates[0].count = 1;
684 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
685 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
686 info->control.rates[0].count = 1;
688 if (is_multicast_ether_addr(hdr->addr1)) {
690 * XXX: verify the rate is in the basic rateset
696 * set up the RTS/CTS rate as the fastest basic rate
697 * that is not faster than the data rate
699 * XXX: Should this check all retry rates?
701 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
704 rate = &sband->bitrates[info->control.rates[0].idx];
706 for (i = 0; i < sband->n_bitrates; i++) {
707 /* must be a basic rate */
708 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
710 /* must not be faster than the data rate */
711 if (sband->bitrates[i].bitrate > rate->bitrate)
714 if (sband->bitrates[baserate].bitrate <
715 sband->bitrates[i].bitrate)
719 info->control.rts_cts_rate_idx = baserate;
722 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
724 * make sure there's no valid rate following
725 * an invalid one, just in case drivers don't
726 * take the API seriously to stop at -1.
729 info->control.rates[i].idx = -1;
732 if (info->control.rates[i].idx < 0) {
738 * For now assume MCS is already set up correctly, this
741 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
742 WARN_ON(info->control.rates[i].idx > 76);
746 /* set up RTS protection if desired */
748 info->control.rates[i].flags |=
749 IEEE80211_TX_RC_USE_RTS_CTS;
752 if (WARN_ON_ONCE(info->control.rates[i].idx >=
753 sband->n_bitrates)) {
754 info->control.rates[i].idx = -1;
758 rate = &sband->bitrates[info->control.rates[i].idx];
760 /* set up short preamble */
761 if (short_preamble &&
762 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
763 info->control.rates[i].flags |=
764 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
766 /* set up G protection */
767 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
768 rate->flags & IEEE80211_RATE_ERP_G)
769 info->control.rates[i].flags |=
770 IEEE80211_TX_RC_USE_CTS_PROTECT;
776 static ieee80211_tx_result debug_noinline
777 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
779 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
780 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
786 * Packet injection may want to control the sequence
787 * number, if we have no matching interface then we
788 * neither assign one ourselves nor ask the driver to.
790 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
793 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
796 if (ieee80211_hdrlen(hdr->frame_control) < 24)
800 * Anything but QoS data that has a sequence number field
801 * (is long enough) gets a sequence number from the global
804 if (!ieee80211_is_data_qos(hdr->frame_control)) {
805 /* driver should assign sequence number */
806 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
807 /* for pure STA mode without beacons, we can do it */
808 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
809 tx->sdata->sequence_number += 0x10;
814 * This should be true for injected/management frames only, for
815 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
816 * above since they are not QoS-data frames.
821 /* include per-STA, per-TID sequence counter */
823 qc = ieee80211_get_qos_ctl(hdr);
824 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
825 seq = &tx->sta->tid_seq[tid];
827 hdr->seq_ctrl = cpu_to_le16(*seq);
829 /* Increase the sequence number. */
830 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
835 static int ieee80211_fragment(struct ieee80211_local *local,
836 struct sk_buff *skb, int hdrlen,
839 struct sk_buff *tail = skb, *tmp;
840 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
841 int pos = hdrlen + per_fragm;
842 int rem = skb->len - hdrlen - per_fragm;
844 if (WARN_ON(rem < 0))
848 int fraglen = per_fragm;
853 tmp = dev_alloc_skb(local->tx_headroom +
855 IEEE80211_ENCRYPT_HEADROOM +
856 IEEE80211_ENCRYPT_TAILROOM);
861 skb_reserve(tmp, local->tx_headroom +
862 IEEE80211_ENCRYPT_HEADROOM);
863 /* copy control information */
864 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
865 skb_copy_queue_mapping(tmp, skb);
866 tmp->priority = skb->priority;
869 /* copy header and data */
870 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
871 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
876 skb->len = hdrlen + per_fragm;
880 static ieee80211_tx_result debug_noinline
881 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
883 struct sk_buff *skb = tx->skb;
884 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
885 struct ieee80211_hdr *hdr = (void *)skb->data;
886 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
890 if (!(tx->flags & IEEE80211_TX_FRAGMENTED))
894 * Warn when submitting a fragmented A-MPDU frame and drop it.
895 * This scenario is handled in ieee80211_tx_prepare but extra
896 * caution taken here as fragmented ampdu may cause Tx stop.
898 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
901 hdrlen = ieee80211_hdrlen(hdr->frame_control);
903 /* internal error, why is TX_FRAGMENTED set? */
904 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
908 * Now fragment the frame. This will allocate all the fragments and
909 * chain them (using skb as the first fragment) to skb->next.
910 * During transmission, we will remove the successfully transmitted
911 * fragments from this list. When the low-level driver rejects one
912 * of the fragments then we will simply pretend to accept the skb
913 * but store it away as pending.
915 if (ieee80211_fragment(tx->local, skb, hdrlen, frag_threshold))
918 /* update duration/seq/flags of fragments */
922 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
924 hdr = (void *)skb->data;
925 info = IEEE80211_SKB_CB(skb);
928 hdr->frame_control |= morefrags;
929 next_len = skb->next->len;
931 * No multi-rate retries for fragmented frames, that
932 * would completely throw off the NAV at other STAs.
934 info->control.rates[1].idx = -1;
935 info->control.rates[2].idx = -1;
936 info->control.rates[3].idx = -1;
937 info->control.rates[4].idx = -1;
938 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 5);
939 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
941 hdr->frame_control &= ~morefrags;
944 hdr->duration_id = ieee80211_duration(tx, 0, next_len);
945 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
947 } while ((skb = skb->next));
952 static ieee80211_tx_result debug_noinline
953 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
955 struct sk_buff *skb = tx->skb;
960 tx->sta->tx_packets++;
962 tx->sta->tx_fragments++;
963 tx->sta->tx_bytes += skb->len;
964 } while ((skb = skb->next));
969 static ieee80211_tx_result debug_noinline
970 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
972 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
977 switch (tx->key->conf.cipher) {
978 case WLAN_CIPHER_SUITE_WEP40:
979 case WLAN_CIPHER_SUITE_WEP104:
980 return ieee80211_crypto_wep_encrypt(tx);
981 case WLAN_CIPHER_SUITE_TKIP:
982 return ieee80211_crypto_tkip_encrypt(tx);
983 case WLAN_CIPHER_SUITE_CCMP:
984 return ieee80211_crypto_ccmp_encrypt(tx);
985 case WLAN_CIPHER_SUITE_AES_CMAC:
986 return ieee80211_crypto_aes_cmac_encrypt(tx);
988 /* handle hw-only algorithm */
989 if (info->control.hw_key) {
990 ieee80211_tx_set_protected(tx);
1000 static ieee80211_tx_result debug_noinline
1001 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1003 struct sk_buff *skb = tx->skb;
1004 struct ieee80211_hdr *hdr;
1009 hdr = (void *) skb->data;
1010 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1011 break; /* must not overwrite AID */
1012 next_len = skb->next ? skb->next->len : 0;
1013 group_addr = is_multicast_ether_addr(hdr->addr1);
1016 ieee80211_duration(tx, group_addr, next_len);
1017 } while ((skb = skb->next));
1022 /* actual transmit path */
1025 * deal with packet injection down monitor interface
1026 * with Radiotap Header -- only called for monitor mode interface
1028 static bool __ieee80211_parse_tx_radiotap(struct ieee80211_tx_data *tx,
1029 struct sk_buff *skb)
1032 * this is the moment to interpret and discard the radiotap header that
1033 * must be at the start of the packet injected in Monitor mode
1035 * Need to take some care with endian-ness since radiotap
1036 * args are little-endian
1039 struct ieee80211_radiotap_iterator iterator;
1040 struct ieee80211_radiotap_header *rthdr =
1041 (struct ieee80211_radiotap_header *) skb->data;
1042 struct ieee80211_supported_band *sband;
1044 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1045 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1048 sband = tx->local->hw.wiphy->bands[tx->channel->band];
1050 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1051 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1053 /* packet is fragmented in HW if we have a non-NULL driver callback */
1054 hw_frag = (tx->local->ops->set_frag_threshold != NULL);
1057 * for every radiotap entry that is present
1058 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1059 * entries present, or -EINVAL on error)
1063 ret = ieee80211_radiotap_iterator_next(&iterator);
1068 /* see if this argument is something we can use */
1069 switch (iterator.this_arg_index) {
1071 * You must take care when dereferencing iterator.this_arg
1072 * for multibyte types... the pointer is not aligned. Use
1073 * get_unaligned((type *)iterator.this_arg) to dereference
1074 * iterator.this_arg for type "type" safely on all arches.
1076 case IEEE80211_RADIOTAP_FLAGS:
1077 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1079 * this indicates that the skb we have been
1080 * handed has the 32-bit FCS CRC at the end...
1081 * we should react to that by snipping it off
1082 * because it will be recomputed and added
1085 if (skb->len < (iterator._max_length + FCS_LEN))
1088 skb_trim(skb, skb->len - FCS_LEN);
1090 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1091 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1092 if ((*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) &&
1094 tx->flags |= IEEE80211_TX_FRAGMENTED;
1098 * Please update the file
1099 * Documentation/networking/mac80211-injection.txt
1100 * when parsing new fields here.
1108 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1112 * remove the radiotap header
1113 * iterator->_max_length was sanity-checked against
1114 * skb->len by iterator init
1116 skb_pull(skb, iterator._max_length);
1121 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1122 struct sk_buff *skb,
1123 struct ieee80211_tx_info *info,
1124 struct tid_ampdu_tx *tid_tx,
1127 bool queued = false;
1129 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1130 info->flags |= IEEE80211_TX_CTL_AMPDU;
1131 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1133 * nothing -- this aggregation session is being started
1134 * but that might still fail with the driver
1137 spin_lock(&tx->sta->lock);
1139 * Need to re-check now, because we may get here
1141 * 1) in the window during which the setup is actually
1142 * already done, but not marked yet because not all
1143 * packets are spliced over to the driver pending
1144 * queue yet -- if this happened we acquire the lock
1145 * either before or after the splice happens, but
1146 * need to recheck which of these cases happened.
1148 * 2) during session teardown, if the OPERATIONAL bit
1149 * was cleared due to the teardown but the pointer
1150 * hasn't been assigned NULL yet (or we loaded it
1151 * before it was assigned) -- in this case it may
1152 * now be NULL which means we should just let the
1153 * packet pass through because splicing the frames
1154 * back is already done.
1156 tid_tx = tx->sta->ampdu_mlme.tid_tx[tid];
1159 /* do nothing, let packet pass through */
1160 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1161 info->flags |= IEEE80211_TX_CTL_AMPDU;
1164 info->control.vif = &tx->sdata->vif;
1165 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1166 __skb_queue_tail(&tid_tx->pending, skb);
1168 spin_unlock(&tx->sta->lock);
1177 static ieee80211_tx_result
1178 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1179 struct ieee80211_tx_data *tx,
1180 struct sk_buff *skb)
1182 struct ieee80211_local *local = sdata->local;
1183 struct ieee80211_hdr *hdr;
1184 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1188 memset(tx, 0, sizeof(*tx));
1192 tx->channel = local->hw.conf.channel;
1194 * Set this flag (used below to indicate "automatic fragmentation"),
1195 * it will be cleared/left by radiotap as desired.
1196 * Only valid when fragmentation is done by the stack.
1198 if (!local->ops->set_frag_threshold)
1199 tx->flags |= IEEE80211_TX_FRAGMENTED;
1201 /* process and remove the injection radiotap header */
1202 if (unlikely(info->flags & IEEE80211_TX_INTFL_HAS_RADIOTAP)) {
1203 if (!__ieee80211_parse_tx_radiotap(tx, skb))
1207 * __ieee80211_parse_tx_radiotap has now removed
1208 * the radiotap header that was present and pre-filled
1209 * 'tx' with tx control information.
1211 info->flags &= ~IEEE80211_TX_INTFL_HAS_RADIOTAP;
1215 * If this flag is set to true anywhere, and we get here,
1216 * we are doing the needed processing, so remove the flag
1219 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1221 hdr = (struct ieee80211_hdr *) skb->data;
1223 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1224 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1225 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1227 } else if (info->flags & IEEE80211_TX_CTL_INJECTED) {
1228 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1231 tx->sta = sta_info_get(sdata, hdr->addr1);
1233 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1234 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)) {
1235 struct tid_ampdu_tx *tid_tx;
1237 qc = ieee80211_get_qos_ctl(hdr);
1238 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1240 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1244 queued = ieee80211_tx_prep_agg(tx, skb, info,
1247 if (unlikely(queued))
1252 if (is_multicast_ether_addr(hdr->addr1)) {
1253 tx->flags &= ~IEEE80211_TX_UNICAST;
1254 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1256 tx->flags |= IEEE80211_TX_UNICAST;
1257 if (unlikely(local->wifi_wme_noack_test))
1258 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1260 info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
1263 if (tx->flags & IEEE80211_TX_FRAGMENTED) {
1264 if ((tx->flags & IEEE80211_TX_UNICAST) &&
1265 skb->len + FCS_LEN > local->hw.wiphy->frag_threshold &&
1266 !(info->flags & IEEE80211_TX_CTL_AMPDU))
1267 tx->flags |= IEEE80211_TX_FRAGMENTED;
1269 tx->flags &= ~IEEE80211_TX_FRAGMENTED;
1273 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1274 else if (test_and_clear_sta_flags(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1275 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1277 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1278 if (skb->len > hdrlen + sizeof(rfc1042_header) + 2) {
1279 u8 *pos = &skb->data[hdrlen + sizeof(rfc1042_header)];
1280 tx->ethertype = (pos[0] << 8) | pos[1];
1282 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1287 static int __ieee80211_tx(struct ieee80211_local *local,
1288 struct sk_buff **skbp,
1289 struct sta_info *sta,
1292 struct sk_buff *skb = *skbp, *next;
1293 struct ieee80211_tx_info *info;
1294 struct ieee80211_sub_if_data *sdata;
1295 unsigned long flags;
1300 int q = skb_get_queue_mapping(skb);
1303 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1304 ret = IEEE80211_TX_OK;
1305 if (local->queue_stop_reasons[q] ||
1306 (!txpending && !skb_queue_empty(&local->pending[q])))
1307 ret = IEEE80211_TX_PENDING;
1308 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1309 if (ret != IEEE80211_TX_OK)
1312 info = IEEE80211_SKB_CB(skb);
1315 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
1316 IEEE80211_TX_CTL_FIRST_FRAGMENT);
1322 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
1324 sdata = vif_to_sdata(info->control.vif);
1326 switch (sdata->vif.type) {
1327 case NL80211_IFTYPE_MONITOR:
1328 info->control.vif = NULL;
1330 case NL80211_IFTYPE_AP_VLAN:
1331 info->control.vif = &container_of(sdata->bss,
1332 struct ieee80211_sub_if_data, u.ap)->vif;
1339 if (sta && sta->uploaded)
1340 info->control.sta = &sta->sta;
1342 info->control.sta = NULL;
1344 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1345 ret = drv_tx(local, skb);
1346 if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) {
1350 if (ret != NETDEV_TX_OK) {
1351 info->control.vif = &sdata->vif;
1352 return IEEE80211_TX_AGAIN;
1355 ieee80211_tpt_led_trig_tx(local, fc, len);
1357 ieee80211_led_tx(local, 1);
1361 return IEEE80211_TX_OK;
1365 * Invoke TX handlers, return 0 on success and non-zero if the
1366 * frame was dropped or queued.
1368 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1370 struct sk_buff *skb = tx->skb;
1371 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1372 ieee80211_tx_result res = TX_DROP;
1374 #define CALL_TXH(txh) \
1377 if (res != TX_CONTINUE) \
1381 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1382 CALL_TXH(ieee80211_tx_h_check_assoc);
1383 CALL_TXH(ieee80211_tx_h_ps_buf);
1384 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1385 CALL_TXH(ieee80211_tx_h_select_key);
1386 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1387 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1389 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
1392 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1393 CALL_TXH(ieee80211_tx_h_sequence);
1394 CALL_TXH(ieee80211_tx_h_fragment);
1395 /* handlers after fragment must be aware of tx info fragmentation! */
1396 CALL_TXH(ieee80211_tx_h_stats);
1397 CALL_TXH(ieee80211_tx_h_encrypt);
1398 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1399 CALL_TXH(ieee80211_tx_h_calculate_duration);
1403 if (unlikely(res == TX_DROP)) {
1404 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1406 struct sk_buff *next;
1413 } else if (unlikely(res == TX_QUEUED)) {
1414 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1421 static void ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1422 struct sk_buff *skb, bool txpending)
1424 struct ieee80211_local *local = sdata->local;
1425 struct ieee80211_tx_data tx;
1426 ieee80211_tx_result res_prepare;
1427 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1428 struct sk_buff *next;
1429 unsigned long flags;
1433 queue = skb_get_queue_mapping(skb);
1435 if (unlikely(skb->len < 10)) {
1442 /* initialises tx */
1443 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1445 if (unlikely(res_prepare == TX_DROP)) {
1449 } else if (unlikely(res_prepare == TX_QUEUED)) {
1454 tx.channel = local->hw.conf.channel;
1455 info->band = tx.channel->band;
1457 if (invoke_tx_handlers(&tx))
1462 ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending);
1464 case IEEE80211_TX_OK:
1466 case IEEE80211_TX_AGAIN:
1468 * Since there are no fragmented frames on A-MPDU
1469 * queues, there's no reason for a driver to reject
1470 * a frame there, warn and drop it.
1472 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
1475 case IEEE80211_TX_PENDING:
1478 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1480 if (local->queue_stop_reasons[queue] ||
1481 !skb_queue_empty(&local->pending[queue])) {
1483 * if queue is stopped, queue up frames for later
1484 * transmission from the tasklet
1489 if (unlikely(txpending))
1490 __skb_queue_head(&local->pending[queue],
1493 __skb_queue_tail(&local->pending[queue],
1495 } while ((skb = next));
1497 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1501 * otherwise retry, but this is a race condition or
1502 * a driver bug (which we warn about if it persists)
1504 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1508 if (WARN(retries > 10, "tx refused but queue active\n"))
1528 /* device xmit handlers */
1530 static int ieee80211_skb_resize(struct ieee80211_local *local,
1531 struct sk_buff *skb,
1532 int head_need, bool may_encrypt)
1537 * This could be optimised, devices that do full hardware
1538 * crypto (including TKIP MMIC) need no tailroom... But we
1539 * have no drivers for such devices currently.
1542 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1543 tail_need -= skb_tailroom(skb);
1544 tail_need = max_t(int, tail_need, 0);
1547 if (head_need || tail_need) {
1548 /* Sorry. Can't account for this any more */
1552 if (skb_header_cloned(skb))
1553 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1554 else if (head_need || tail_need)
1555 I802_DEBUG_INC(local->tx_expand_skb_head);
1559 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1560 wiphy_debug(local->hw.wiphy,
1561 "failed to reallocate TX buffer\n");
1565 /* update truesize too */
1566 skb->truesize += head_need + tail_need;
1571 static void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1572 struct sk_buff *skb)
1574 struct ieee80211_local *local = sdata->local;
1575 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1576 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1577 struct ieee80211_sub_if_data *tmp_sdata;
1583 if (unlikely(sdata->vif.type == NL80211_IFTYPE_MONITOR)) {
1587 info->flags |= IEEE80211_TX_CTL_INJECTED |
1588 IEEE80211_TX_INTFL_HAS_RADIOTAP;
1590 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1591 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1592 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1594 /* check the header is complete in the frame */
1595 if (likely(skb->len >= len_rthdr + hdrlen)) {
1597 * We process outgoing injected frames that have a
1598 * local address we handle as though they are our
1600 * This code here isn't entirely correct, the local
1601 * MAC address is not necessarily enough to find
1602 * the interface to use; for that proper VLAN/WDS
1603 * support we will need a different mechanism.
1606 list_for_each_entry_rcu(tmp_sdata, &local->interfaces,
1608 if (!ieee80211_sdata_running(tmp_sdata))
1610 if (tmp_sdata->vif.type ==
1611 NL80211_IFTYPE_MONITOR ||
1612 tmp_sdata->vif.type ==
1613 NL80211_IFTYPE_AP_VLAN ||
1614 tmp_sdata->vif.type ==
1617 if (compare_ether_addr(tmp_sdata->vif.addr,
1626 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1628 headroom = local->tx_headroom;
1630 headroom += IEEE80211_ENCRYPT_HEADROOM;
1631 headroom -= skb_headroom(skb);
1632 headroom = max_t(int, 0, headroom);
1634 if (ieee80211_skb_resize(local, skb, headroom, may_encrypt)) {
1640 hdr = (struct ieee80211_hdr *) skb->data;
1641 info->control.vif = &sdata->vif;
1643 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1644 ieee80211_is_data(hdr->frame_control) &&
1645 !is_multicast_ether_addr(hdr->addr1))
1646 if (mesh_nexthop_lookup(skb, sdata)) {
1647 /* skb queued: don't free */
1652 ieee80211_set_qos_hdr(local, skb);
1653 ieee80211_tx(sdata, skb, false);
1657 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1658 struct net_device *dev)
1660 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1661 struct ieee80211_channel *chan = local->hw.conf.channel;
1662 struct ieee80211_radiotap_header *prthdr =
1663 (struct ieee80211_radiotap_header *)skb->data;
1664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1668 * Frame injection is not allowed if beaconing is not allowed
1669 * or if we need radar detection. Beaconing is usually not allowed when
1670 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1671 * Passive scan is also used in world regulatory domains where
1672 * your country is not known and as such it should be treated as
1673 * NO TX unless the channel is explicitly allowed in which case
1674 * your current regulatory domain would not have the passive scan
1677 * Since AP mode uses monitor interfaces to inject/TX management
1678 * frames we can make AP mode the exception to this rule once it
1679 * supports radar detection as its implementation can deal with
1680 * radar detection by itself. We can do that later by adding a
1681 * monitor flag interfaces used for AP support.
1683 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1684 IEEE80211_CHAN_PASSIVE_SCAN)))
1687 /* check for not even having the fixed radiotap header part */
1688 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1689 goto fail; /* too short to be possibly valid */
1691 /* is it a header version we can trust to find length from? */
1692 if (unlikely(prthdr->it_version))
1693 goto fail; /* only version 0 is supported */
1695 /* then there must be a radiotap header with a length we can use */
1696 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1698 /* does the skb contain enough to deliver on the alleged length? */
1699 if (unlikely(skb->len < len_rthdr))
1700 goto fail; /* skb too short for claimed rt header extent */
1703 * fix up the pointers accounting for the radiotap
1704 * header still being in there. We are being given
1705 * a precooked IEEE80211 header so no need for
1708 skb_set_mac_header(skb, len_rthdr);
1710 * these are just fixed to the end of the rt area since we
1711 * don't have any better information and at this point, nobody cares
1713 skb_set_network_header(skb, len_rthdr);
1714 skb_set_transport_header(skb, len_rthdr);
1716 memset(info, 0, sizeof(*info));
1718 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1720 /* pass the radiotap header up to xmit */
1721 ieee80211_xmit(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1722 return NETDEV_TX_OK;
1726 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1730 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1731 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1732 * @skb: packet to be sent
1733 * @dev: incoming interface
1735 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1736 * not be freed, and caller is responsible for either retrying later or freeing
1739 * This function takes in an Ethernet header and encapsulates it with suitable
1740 * IEEE 802.11 header based on which interface the packet is coming in. The
1741 * encapsulated packet will then be passed to master interface, wlan#.11, for
1742 * transmission (through low-level driver).
1744 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1745 struct net_device *dev)
1747 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1748 struct ieee80211_local *local = sdata->local;
1749 struct ieee80211_tx_info *info;
1750 int ret = NETDEV_TX_BUSY, head_need;
1751 u16 ethertype, hdrlen, meshhdrlen = 0;
1753 struct ieee80211_hdr hdr;
1754 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1755 struct mesh_path __maybe_unused *mppath = NULL;
1756 const u8 *encaps_data;
1757 int encaps_len, skip_header_bytes;
1759 struct sta_info *sta = NULL;
1761 struct sk_buff *tmp_skb;
1763 if (unlikely(skb->len < ETH_HLEN)) {
1768 /* convert Ethernet header to proper 802.11 header (based on
1769 * operation mode) */
1770 ethertype = (skb->data[12] << 8) | skb->data[13];
1771 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1773 switch (sdata->vif.type) {
1774 case NL80211_IFTYPE_AP_VLAN:
1776 sta = rcu_dereference(sdata->u.vlan.sta);
1778 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1780 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1781 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1782 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1783 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1785 sta_flags = get_sta_flags(sta);
1791 case NL80211_IFTYPE_AP:
1792 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1794 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1795 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1796 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1799 case NL80211_IFTYPE_WDS:
1800 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1802 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1803 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1804 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1805 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1808 #ifdef CONFIG_MAC80211_MESH
1809 case NL80211_IFTYPE_MESH_POINT:
1810 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1811 /* Do not send frames with mesh_ttl == 0 */
1812 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1816 if (!is_multicast_ether_addr(skb->data))
1817 mppath = mpp_path_lookup(skb->data, sdata);
1820 * Use address extension if it is a packet from
1821 * another interface or if we know the destination
1822 * is being proxied by a portal (i.e. portal address
1823 * differs from proxied address)
1825 if (compare_ether_addr(sdata->vif.addr,
1826 skb->data + ETH_ALEN) == 0 &&
1827 !(mppath && compare_ether_addr(mppath->mpp, skb->data))) {
1828 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1829 skb->data, skb->data + ETH_ALEN);
1830 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1833 int is_mesh_mcast = 1;
1837 if (is_multicast_ether_addr(skb->data))
1838 /* DA TA mSA AE:SA */
1839 mesh_da = skb->data;
1841 static const u8 bcast[ETH_ALEN] =
1842 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1844 /* RA TA mDA mSA AE:DA SA */
1845 mesh_da = mppath->mpp;
1848 /* DA TA mSA AE:SA */
1852 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1853 mesh_da, sdata->vif.addr);
1857 ieee80211_new_mesh_header(&mesh_hdr,
1859 skb->data + ETH_ALEN,
1863 ieee80211_new_mesh_header(&mesh_hdr,
1866 skb->data + ETH_ALEN);
1871 case NL80211_IFTYPE_STATION:
1872 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1873 if (sdata->u.mgd.use_4addr &&
1874 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1875 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1877 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1878 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1879 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1882 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1884 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1885 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1889 case NL80211_IFTYPE_ADHOC:
1891 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1892 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1893 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1902 * There's no need to try to look up the destination
1903 * if it is a multicast address (which can only happen
1906 if (!is_multicast_ether_addr(hdr.addr1)) {
1908 sta = sta_info_get(sdata, hdr.addr1);
1910 sta_flags = get_sta_flags(sta);
1914 /* receiver and we are QoS enabled, use a QoS type frame */
1915 if ((sta_flags & WLAN_STA_WME) && local->hw.queues >= 4) {
1916 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1921 * Drop unicast frames to unauthorised stations unless they are
1922 * EAPOL frames from the local station.
1924 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1925 unlikely(!is_multicast_ether_addr(hdr.addr1) &&
1926 !(sta_flags & WLAN_STA_AUTHORIZED) &&
1927 !(cpu_to_be16(ethertype) == sdata->control_port_protocol &&
1928 compare_ether_addr(sdata->vif.addr,
1929 skb->data + ETH_ALEN) == 0))) {
1930 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1931 if (net_ratelimit())
1932 printk(KERN_DEBUG "%s: dropped frame to %pM"
1933 " (unauthorized port)\n", dev->name,
1937 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1944 * If the skb is shared we need to obtain our own copy.
1946 if (skb_shared(skb)) {
1948 skb = skb_clone(skb, GFP_ATOMIC);
1957 hdr.frame_control = fc;
1958 hdr.duration_id = 0;
1961 skip_header_bytes = ETH_HLEN;
1962 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
1963 encaps_data = bridge_tunnel_header;
1964 encaps_len = sizeof(bridge_tunnel_header);
1965 skip_header_bytes -= 2;
1966 } else if (ethertype >= 0x600) {
1967 encaps_data = rfc1042_header;
1968 encaps_len = sizeof(rfc1042_header);
1969 skip_header_bytes -= 2;
1975 nh_pos = skb_network_header(skb) - skb->data;
1976 h_pos = skb_transport_header(skb) - skb->data;
1978 skb_pull(skb, skip_header_bytes);
1979 nh_pos -= skip_header_bytes;
1980 h_pos -= skip_header_bytes;
1982 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
1985 * So we need to modify the skb header and hence need a copy of
1986 * that. The head_need variable above doesn't, so far, include
1987 * the needed header space that we don't need right away. If we
1988 * can, then we don't reallocate right now but only after the
1989 * frame arrives at the master device (if it does...)
1991 * If we cannot, however, then we will reallocate to include all
1992 * the ever needed space. Also, if we need to reallocate it anyway,
1993 * make it big enough for everything we may ever need.
1996 if (head_need > 0 || skb_cloned(skb)) {
1997 head_need += IEEE80211_ENCRYPT_HEADROOM;
1998 head_need += local->tx_headroom;
1999 head_need = max_t(int, 0, head_need);
2000 if (ieee80211_skb_resize(local, skb, head_need, true))
2005 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2006 nh_pos += encaps_len;
2007 h_pos += encaps_len;
2010 #ifdef CONFIG_MAC80211_MESH
2011 if (meshhdrlen > 0) {
2012 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2013 nh_pos += meshhdrlen;
2014 h_pos += meshhdrlen;
2018 if (ieee80211_is_data_qos(fc)) {
2019 __le16 *qos_control;
2021 qos_control = (__le16*) skb_push(skb, 2);
2022 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2024 * Maybe we could actually set some fields here, for now just
2025 * initialise to zero to indicate no special operation.
2029 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2034 dev->stats.tx_packets++;
2035 dev->stats.tx_bytes += skb->len;
2037 /* Update skb pointers to various headers since this modified frame
2038 * is going to go through Linux networking code that may potentially
2039 * need things like pointer to IP header. */
2040 skb_set_mac_header(skb, 0);
2041 skb_set_network_header(skb, nh_pos);
2042 skb_set_transport_header(skb, h_pos);
2044 info = IEEE80211_SKB_CB(skb);
2045 memset(info, 0, sizeof(*info));
2047 dev->trans_start = jiffies;
2048 ieee80211_xmit(sdata, skb);
2050 return NETDEV_TX_OK;
2053 if (ret == NETDEV_TX_OK)
2061 * ieee80211_clear_tx_pending may not be called in a context where
2062 * it is possible that it packets could come in again.
2064 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2068 for (i = 0; i < local->hw.queues; i++)
2069 skb_queue_purge(&local->pending[i]);
2072 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2073 struct sk_buff *skb)
2075 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2076 struct ieee80211_sub_if_data *sdata;
2077 struct sta_info *sta;
2078 struct ieee80211_hdr *hdr;
2082 sdata = vif_to_sdata(info->control.vif);
2084 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2085 ieee80211_tx(sdata, skb, true);
2087 hdr = (struct ieee80211_hdr *)skb->data;
2088 sta = sta_info_get(sdata, hdr->addr1);
2090 ret = __ieee80211_tx(local, &skb, sta, true);
2091 if (ret != IEEE80211_TX_OK)
2099 * Transmit all pending packets. Called from tasklet.
2101 void ieee80211_tx_pending(unsigned long data)
2103 struct ieee80211_local *local = (struct ieee80211_local *)data;
2104 struct ieee80211_sub_if_data *sdata;
2105 unsigned long flags;
2111 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2112 for (i = 0; i < local->hw.queues; i++) {
2114 * If queue is stopped by something other than due to pending
2115 * frames, or we have no pending frames, proceed to next queue.
2117 if (local->queue_stop_reasons[i] ||
2118 skb_queue_empty(&local->pending[i]))
2121 while (!skb_queue_empty(&local->pending[i])) {
2122 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2123 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2125 if (WARN_ON(!info->control.vif)) {
2130 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2133 txok = ieee80211_tx_pending_skb(local, skb);
2135 __skb_queue_head(&local->pending[i], skb);
2136 spin_lock_irqsave(&local->queue_stop_reason_lock,
2142 if (skb_queue_empty(&local->pending[i]))
2143 list_for_each_entry_rcu(sdata, &local->interfaces, list)
2144 netif_wake_subqueue(sdata->dev, i);
2146 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2151 /* functions for drivers to get certain frames */
2153 static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss,
2154 struct sk_buff *skb,
2155 struct beacon_data *beacon)
2159 int i, have_bits = 0, n1, n2;
2161 /* Generate bitmap for TIM only if there are any STAs in power save
2163 if (atomic_read(&bss->num_sta_ps) > 0)
2164 /* in the hope that this is faster than
2165 * checking byte-for-byte */
2166 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2167 IEEE80211_MAX_AID+1);
2169 if (bss->dtim_count == 0)
2170 bss->dtim_count = beacon->dtim_period - 1;
2174 tim = pos = (u8 *) skb_put(skb, 6);
2175 *pos++ = WLAN_EID_TIM;
2177 *pos++ = bss->dtim_count;
2178 *pos++ = beacon->dtim_period;
2180 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2183 bss->dtim_bc_mc = aid0 == 1;
2186 /* Find largest even number N1 so that bits numbered 1 through
2187 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2188 * (N2 + 1) x 8 through 2007 are 0. */
2190 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2197 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2204 /* Bitmap control */
2206 /* Part Virt Bitmap */
2207 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2209 tim[1] = n2 - n1 + 4;
2210 skb_put(skb, n2 - n1);
2212 *pos++ = aid0; /* Bitmap control */
2213 *pos++ = 0; /* Part Virt Bitmap */
2217 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2218 struct ieee80211_vif *vif,
2219 u16 *tim_offset, u16 *tim_length)
2221 struct ieee80211_local *local = hw_to_local(hw);
2222 struct sk_buff *skb = NULL;
2223 struct ieee80211_tx_info *info;
2224 struct ieee80211_sub_if_data *sdata = NULL;
2225 struct ieee80211_if_ap *ap = NULL;
2226 struct beacon_data *beacon;
2227 struct ieee80211_supported_band *sband;
2228 enum ieee80211_band band = local->hw.conf.channel->band;
2229 struct ieee80211_tx_rate_control txrc;
2231 sband = local->hw.wiphy->bands[band];
2235 sdata = vif_to_sdata(vif);
2237 if (!ieee80211_sdata_running(sdata))
2245 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2247 beacon = rcu_dereference(ap->beacon);
2250 * headroom, head length,
2251 * tail length and maximum TIM length
2253 skb = dev_alloc_skb(local->tx_headroom +
2255 beacon->tail_len + 256);
2259 skb_reserve(skb, local->tx_headroom);
2260 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2264 * Not very nice, but we want to allow the driver to call
2265 * ieee80211_beacon_get() as a response to the set_tim()
2266 * callback. That, however, is already invoked under the
2267 * sta_lock to guarantee consistent and race-free update
2268 * of the tim bitmap in mac80211 and the driver.
2270 if (local->tim_in_locked_section) {
2271 ieee80211_beacon_add_tim(ap, skb, beacon);
2273 unsigned long flags;
2275 spin_lock_irqsave(&local->sta_lock, flags);
2276 ieee80211_beacon_add_tim(ap, skb, beacon);
2277 spin_unlock_irqrestore(&local->sta_lock, flags);
2281 *tim_offset = beacon->head_len;
2283 *tim_length = skb->len - beacon->head_len;
2286 memcpy(skb_put(skb, beacon->tail_len),
2287 beacon->tail, beacon->tail_len);
2290 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2291 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2292 struct ieee80211_hdr *hdr;
2293 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2298 skb = skb_copy(presp, GFP_ATOMIC);
2302 hdr = (struct ieee80211_hdr *) skb->data;
2303 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2304 IEEE80211_STYPE_BEACON);
2305 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2306 struct ieee80211_mgmt *mgmt;
2309 #ifdef CONFIG_MAC80211_MESH
2310 if (!sdata->u.mesh.mesh_id_len)
2314 /* headroom, head length, tail length and maximum TIM length */
2315 skb = dev_alloc_skb(local->tx_headroom + 400 +
2316 sdata->u.mesh.vendor_ie_len);
2320 skb_reserve(skb, local->hw.extra_tx_headroom);
2321 mgmt = (struct ieee80211_mgmt *)
2322 skb_put(skb, 24 + sizeof(mgmt->u.beacon));
2323 memset(mgmt, 0, 24 + sizeof(mgmt->u.beacon));
2324 mgmt->frame_control =
2325 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2326 memset(mgmt->da, 0xff, ETH_ALEN);
2327 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2328 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2329 mgmt->u.beacon.beacon_int =
2330 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2331 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
2333 pos = skb_put(skb, 2);
2334 *pos++ = WLAN_EID_SSID;
2337 mesh_mgmt_ies_add(skb, sdata);
2343 info = IEEE80211_SKB_CB(skb);
2345 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2346 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2349 memset(&txrc, 0, sizeof(txrc));
2352 txrc.bss_conf = &sdata->vif.bss_conf;
2354 txrc.reported_rate.idx = -1;
2355 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2356 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2357 txrc.max_rate_idx = -1;
2359 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2361 rate_control_get_rate(sdata, NULL, &txrc);
2363 info->control.vif = vif;
2365 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2366 IEEE80211_TX_CTL_ASSIGN_SEQ |
2367 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2372 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2374 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2375 struct ieee80211_vif *vif)
2377 struct ieee80211_sub_if_data *sdata;
2378 struct ieee80211_if_managed *ifmgd;
2379 struct ieee80211_pspoll *pspoll;
2380 struct ieee80211_local *local;
2381 struct sk_buff *skb;
2383 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2386 sdata = vif_to_sdata(vif);
2387 ifmgd = &sdata->u.mgd;
2388 local = sdata->local;
2390 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2392 printk(KERN_DEBUG "%s: failed to allocate buffer for "
2393 "pspoll template\n", sdata->name);
2396 skb_reserve(skb, local->hw.extra_tx_headroom);
2398 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2399 memset(pspoll, 0, sizeof(*pspoll));
2400 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2401 IEEE80211_STYPE_PSPOLL);
2402 pspoll->aid = cpu_to_le16(ifmgd->aid);
2404 /* aid in PS-Poll has its two MSBs each set to 1 */
2405 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2407 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2408 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2412 EXPORT_SYMBOL(ieee80211_pspoll_get);
2414 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2415 struct ieee80211_vif *vif)
2417 struct ieee80211_hdr_3addr *nullfunc;
2418 struct ieee80211_sub_if_data *sdata;
2419 struct ieee80211_if_managed *ifmgd;
2420 struct ieee80211_local *local;
2421 struct sk_buff *skb;
2423 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2426 sdata = vif_to_sdata(vif);
2427 ifmgd = &sdata->u.mgd;
2428 local = sdata->local;
2430 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2432 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
2433 "template\n", sdata->name);
2436 skb_reserve(skb, local->hw.extra_tx_headroom);
2438 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2440 memset(nullfunc, 0, sizeof(*nullfunc));
2441 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2442 IEEE80211_STYPE_NULLFUNC |
2443 IEEE80211_FCTL_TODS);
2444 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2445 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2446 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2450 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2452 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2453 struct ieee80211_vif *vif,
2454 const u8 *ssid, size_t ssid_len,
2455 const u8 *ie, size_t ie_len)
2457 struct ieee80211_sub_if_data *sdata;
2458 struct ieee80211_local *local;
2459 struct ieee80211_hdr_3addr *hdr;
2460 struct sk_buff *skb;
2464 sdata = vif_to_sdata(vif);
2465 local = sdata->local;
2466 ie_ssid_len = 2 + ssid_len;
2468 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2469 ie_ssid_len + ie_len);
2471 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
2472 "request template\n", sdata->name);
2476 skb_reserve(skb, local->hw.extra_tx_headroom);
2478 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2479 memset(hdr, 0, sizeof(*hdr));
2480 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2481 IEEE80211_STYPE_PROBE_REQ);
2482 memset(hdr->addr1, 0xff, ETH_ALEN);
2483 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2484 memset(hdr->addr3, 0xff, ETH_ALEN);
2486 pos = skb_put(skb, ie_ssid_len);
2487 *pos++ = WLAN_EID_SSID;
2490 memcpy(pos, ssid, ssid_len);
2494 pos = skb_put(skb, ie_len);
2495 memcpy(pos, ie, ie_len);
2500 EXPORT_SYMBOL(ieee80211_probereq_get);
2502 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2503 const void *frame, size_t frame_len,
2504 const struct ieee80211_tx_info *frame_txctl,
2505 struct ieee80211_rts *rts)
2507 const struct ieee80211_hdr *hdr = frame;
2509 rts->frame_control =
2510 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2511 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2513 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2514 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2516 EXPORT_SYMBOL(ieee80211_rts_get);
2518 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2519 const void *frame, size_t frame_len,
2520 const struct ieee80211_tx_info *frame_txctl,
2521 struct ieee80211_cts *cts)
2523 const struct ieee80211_hdr *hdr = frame;
2525 cts->frame_control =
2526 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2527 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2528 frame_len, frame_txctl);
2529 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2531 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2534 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2535 struct ieee80211_vif *vif)
2537 struct ieee80211_local *local = hw_to_local(hw);
2538 struct sk_buff *skb = NULL;
2539 struct sta_info *sta;
2540 struct ieee80211_tx_data tx;
2541 struct ieee80211_sub_if_data *sdata;
2542 struct ieee80211_if_ap *bss = NULL;
2543 struct beacon_data *beacon;
2544 struct ieee80211_tx_info *info;
2546 sdata = vif_to_sdata(vif);
2550 beacon = rcu_dereference(bss->beacon);
2552 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2555 if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2556 goto out; /* send buffered bc/mc only after DTIM beacon */
2559 skb = skb_dequeue(&bss->ps_bc_buf);
2562 local->total_ps_buffered--;
2564 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2565 struct ieee80211_hdr *hdr =
2566 (struct ieee80211_hdr *) skb->data;
2567 /* more buffered multicast/broadcast frames ==> set
2568 * MoreData flag in IEEE 802.11 header to inform PS
2570 hdr->frame_control |=
2571 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2574 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2576 dev_kfree_skb_any(skb);
2579 info = IEEE80211_SKB_CB(skb);
2582 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2583 tx.channel = local->hw.conf.channel;
2584 info->band = tx.channel->band;
2586 if (invoke_tx_handlers(&tx))
2593 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2595 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
2597 skb_set_mac_header(skb, 0);
2598 skb_set_network_header(skb, 0);
2599 skb_set_transport_header(skb, 0);
2601 /* send all internal mgmt frames on VO */
2602 skb_set_queue_mapping(skb, 0);
2605 * The other path calling ieee80211_xmit is from the tasklet,
2606 * and while we can handle concurrent transmissions locking
2607 * requirements are that we do not come into tx with bhs on.
2610 ieee80211_xmit(sdata, skb);