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[info->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_BAND_60GHZ:
144 /* TODO, for now fall through */
145 case IEEE80211_NUM_BANDS:
151 /* No matching basic rate found; use highest suitable mandatory
156 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
157 if (ieee80211_is_data_qos(hdr->frame_control) &&
158 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
161 /* Time needed to transmit ACK
162 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
163 * to closest integer */
164 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
165 tx->sdata->vif.bss_conf.use_short_preamble);
168 /* Frame is fragmented: duration increases with time needed to
169 * transmit next fragment plus ACK and 2 x SIFS. */
170 dur *= 2; /* ACK + SIFS */
172 dur += ieee80211_frame_duration(sband->band, next_frag_len,
173 txrate->bitrate, erp,
174 tx->sdata->vif.bss_conf.use_short_preamble);
177 return cpu_to_le16(dur);
181 static ieee80211_tx_result debug_noinline
182 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
184 struct ieee80211_local *local = tx->local;
185 struct ieee80211_if_managed *ifmgd;
187 /* driver doesn't support power save */
188 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
191 /* hardware does dynamic power save */
192 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
195 /* dynamic power save disabled */
196 if (local->hw.conf.dynamic_ps_timeout <= 0)
199 /* we are scanning, don't enable power save */
203 if (!local->ps_sdata)
206 /* No point if we're going to suspend */
207 if (local->quiescing)
210 /* dynamic ps is supported only in managed mode */
211 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
214 ifmgd = &tx->sdata->u.mgd;
217 * Don't wakeup from power save if u-apsd is enabled, voip ac has
218 * u-apsd enabled and the frame is in voip class. This effectively
219 * means that even if all access categories have u-apsd enabled, in
220 * practise u-apsd is only used with the voip ac. This is a
221 * workaround for the case when received voip class packets do not
222 * have correct qos tag for some reason, due the network or the
225 * Note: ifmgd->uapsd_queues access is racy here. If the value is
226 * changed via debugfs, user needs to reassociate manually to have
227 * everything in sync.
229 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
230 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
231 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
234 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
235 ieee80211_stop_queues_by_reason(&local->hw,
236 IEEE80211_QUEUE_STOP_REASON_PS);
237 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
238 ieee80211_queue_work(&local->hw,
239 &local->dynamic_ps_disable_work);
242 /* Don't restart the timer if we're not disassociated */
243 if (!ifmgd->associated)
246 mod_timer(&local->dynamic_ps_timer, jiffies +
247 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
252 static ieee80211_tx_result debug_noinline
253 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
256 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
257 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
260 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
263 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
264 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
265 !ieee80211_is_probe_req(hdr->frame_control) &&
266 !ieee80211_is_nullfunc(hdr->frame_control))
268 * When software scanning only nullfunc frames (to notify
269 * the sleep state to the AP) and probe requests (for the
270 * active scan) are allowed, all other frames should not be
271 * sent and we should not get here, but if we do
272 * nonetheless, drop them to avoid sending them
273 * off-channel. See the link below and
274 * ieee80211_start_scan() for more.
276 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
280 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
283 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
286 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
290 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
292 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
293 if (unlikely(!assoc &&
294 ieee80211_is_data(hdr->frame_control))) {
295 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
296 sdata_info(tx->sdata,
297 "dropped data frame to not associated station %pM\n",
300 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
303 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
304 ieee80211_is_data(hdr->frame_control) &&
305 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
307 * 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);
346 * Drop one frame from each station from the lowest-priority
347 * AC that has frames at all.
349 list_for_each_entry_rcu(sta, &local->sta_list, list) {
352 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
353 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
354 total += skb_queue_len(&sta->ps_tx_buf[ac]);
365 local->total_ps_buffered = total;
366 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
369 static ieee80211_tx_result
370 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
372 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
373 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
376 * broadcast/multicast frame
378 * If any of the associated stations is in power save mode,
379 * the frame is buffered to be sent after DTIM beacon frame.
380 * This is done either by the hardware or us.
383 /* powersaving STAs only in AP/VLAN mode */
387 /* no buffering for ordered frames */
388 if (ieee80211_has_order(hdr->frame_control))
391 /* no stations in PS mode */
392 if (!atomic_read(&tx->sdata->bss->num_sta_ps))
395 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
396 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
397 info->hw_queue = tx->sdata->vif.cab_queue;
399 /* device releases frame after DTIM beacon */
400 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
403 /* buffered in mac80211 */
404 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
405 purge_old_ps_buffers(tx->local);
407 if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
409 "BC TX buffer full - dropping the oldest frame\n");
410 dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
412 tx->local->total_ps_buffered++;
414 skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
419 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
422 if (!ieee80211_is_mgmt(fc))
425 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
428 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
435 static ieee80211_tx_result
436 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
438 struct sta_info *sta = tx->sta;
439 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
440 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
441 struct ieee80211_local *local = tx->local;
446 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
447 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
448 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
449 int ac = skb_get_queue_mapping(tx->skb);
451 /* only deauth, disassoc and action are bufferable MMPDUs */
452 if (ieee80211_is_mgmt(hdr->frame_control) &&
453 !ieee80211_is_deauth(hdr->frame_control) &&
454 !ieee80211_is_disassoc(hdr->frame_control) &&
455 !ieee80211_is_action(hdr->frame_control)) {
456 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
460 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
461 sta->sta.addr, sta->sta.aid, ac);
462 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
463 purge_old_ps_buffers(tx->local);
464 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
465 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
467 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
471 tx->local->total_ps_buffered++;
473 info->control.jiffies = jiffies;
474 info->control.vif = &tx->sdata->vif;
475 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
476 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
478 if (!timer_pending(&local->sta_cleanup))
479 mod_timer(&local->sta_cleanup,
480 round_jiffies(jiffies +
481 STA_INFO_CLEANUP_INTERVAL));
484 * We queued up some frames, so the TIM bit might
485 * need to be set, recalculate it.
487 sta_info_recalc_tim(sta);
490 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
492 "STA %pM in PS mode, but polling/in SP -> send frame\n",
499 static ieee80211_tx_result debug_noinline
500 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
502 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
505 if (tx->flags & IEEE80211_TX_UNICAST)
506 return ieee80211_tx_h_unicast_ps_buf(tx);
508 return ieee80211_tx_h_multicast_ps_buf(tx);
511 static ieee80211_tx_result debug_noinline
512 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
514 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
516 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
517 tx->sdata->control_port_no_encrypt))
518 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
523 static ieee80211_tx_result debug_noinline
524 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
526 struct ieee80211_key *key;
527 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
528 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
530 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
532 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
534 else if (ieee80211_is_mgmt(hdr->frame_control) &&
535 is_multicast_ether_addr(hdr->addr1) &&
536 ieee80211_is_robust_mgmt_frame(hdr) &&
537 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
539 else if (is_multicast_ether_addr(hdr->addr1) &&
540 (key = rcu_dereference(tx->sdata->default_multicast_key)))
542 else if (!is_multicast_ether_addr(hdr->addr1) &&
543 (key = rcu_dereference(tx->sdata->default_unicast_key)))
545 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
547 else if (!tx->sdata->drop_unencrypted)
549 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
551 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
552 !(ieee80211_is_action(hdr->frame_control) &&
553 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
555 else if (ieee80211_is_mgmt(hdr->frame_control) &&
556 !ieee80211_is_robust_mgmt_frame(hdr))
559 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
564 bool skip_hw = false;
566 tx->key->tx_rx_count++;
567 /* TODO: add threshold stuff again */
569 switch (tx->key->conf.cipher) {
570 case WLAN_CIPHER_SUITE_WEP40:
571 case WLAN_CIPHER_SUITE_WEP104:
572 case WLAN_CIPHER_SUITE_TKIP:
573 if (!ieee80211_is_data_present(hdr->frame_control))
576 case WLAN_CIPHER_SUITE_CCMP:
577 if (!ieee80211_is_data_present(hdr->frame_control) &&
578 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
582 skip_hw = (tx->key->conf.flags &
583 IEEE80211_KEY_FLAG_SW_MGMT) &&
584 ieee80211_is_mgmt(hdr->frame_control);
586 case WLAN_CIPHER_SUITE_AES_CMAC:
587 if (!ieee80211_is_mgmt(hdr->frame_control))
592 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
595 if (!skip_hw && tx->key &&
596 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
597 info->control.hw_key = &tx->key->conf;
603 static ieee80211_tx_result debug_noinline
604 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
606 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
607 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
608 struct ieee80211_supported_band *sband;
609 struct ieee80211_rate *rate;
612 bool inval = false, rts = false, short_preamble = false;
613 struct ieee80211_tx_rate_control txrc;
616 memset(&txrc, 0, sizeof(txrc));
618 sband = tx->local->hw.wiphy->bands[info->band];
620 len = min_t(u32, tx->skb->len + FCS_LEN,
621 tx->local->hw.wiphy->frag_threshold);
623 /* set up the tx rate control struct we give the RC algo */
624 txrc.hw = &tx->local->hw;
626 txrc.bss_conf = &tx->sdata->vif.bss_conf;
628 txrc.reported_rate.idx = -1;
629 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
630 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
631 txrc.max_rate_idx = -1;
633 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
634 memcpy(txrc.rate_idx_mcs_mask,
635 tx->sdata->rc_rateidx_mcs_mask[info->band],
636 sizeof(txrc.rate_idx_mcs_mask));
637 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
638 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
639 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
641 /* set up RTS protection if desired */
642 if (len > tx->local->hw.wiphy->rts_threshold) {
643 txrc.rts = rts = true;
647 * Use short preamble if the BSS can handle it, but not for
648 * management frames unless we know the receiver can handle
649 * that -- the management frame might be to a station that
650 * just wants a probe response.
652 if (tx->sdata->vif.bss_conf.use_short_preamble &&
653 (ieee80211_is_data(hdr->frame_control) ||
654 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
655 txrc.short_preamble = short_preamble = true;
658 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
661 * Lets not bother rate control if we're associated and cannot
662 * talk to the sta. This should not happen.
664 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
665 !rate_usable_index_exists(sband, &tx->sta->sta),
666 "%s: Dropped data frame as no usable bitrate found while "
667 "scanning and associated. Target station: "
668 "%pM on %d GHz band\n",
669 tx->sdata->name, hdr->addr1,
674 * If we're associated with the sta at this point we know we can at
675 * least send the frame at the lowest bit rate.
677 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
679 if (unlikely(info->control.rates[0].idx < 0))
682 if (txrc.reported_rate.idx < 0) {
683 txrc.reported_rate = info->control.rates[0];
684 if (tx->sta && ieee80211_is_data(hdr->frame_control))
685 tx->sta->last_tx_rate = txrc.reported_rate;
687 tx->sta->last_tx_rate = txrc.reported_rate;
689 if (unlikely(!info->control.rates[0].count))
690 info->control.rates[0].count = 1;
692 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
693 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
694 info->control.rates[0].count = 1;
696 if (is_multicast_ether_addr(hdr->addr1)) {
698 * XXX: verify the rate is in the basic rateset
704 * set up the RTS/CTS rate as the fastest basic rate
705 * that is not faster than the data rate
707 * XXX: Should this check all retry rates?
709 if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
712 rate = &sband->bitrates[info->control.rates[0].idx];
714 for (i = 0; i < sband->n_bitrates; i++) {
715 /* must be a basic rate */
716 if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
718 /* must not be faster than the data rate */
719 if (sband->bitrates[i].bitrate > rate->bitrate)
722 if (sband->bitrates[baserate].bitrate <
723 sband->bitrates[i].bitrate)
727 info->control.rts_cts_rate_idx = baserate;
730 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
732 * make sure there's no valid rate following
733 * an invalid one, just in case drivers don't
734 * take the API seriously to stop at -1.
737 info->control.rates[i].idx = -1;
740 if (info->control.rates[i].idx < 0) {
746 * For now assume MCS is already set up correctly, this
749 if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
750 WARN_ON(info->control.rates[i].idx > 76);
754 /* set up RTS protection if desired */
756 info->control.rates[i].flags |=
757 IEEE80211_TX_RC_USE_RTS_CTS;
760 if (WARN_ON_ONCE(info->control.rates[i].idx >=
761 sband->n_bitrates)) {
762 info->control.rates[i].idx = -1;
766 rate = &sband->bitrates[info->control.rates[i].idx];
768 /* set up short preamble */
769 if (short_preamble &&
770 rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
771 info->control.rates[i].flags |=
772 IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
774 /* set up G protection */
775 if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
776 rate->flags & IEEE80211_RATE_ERP_G)
777 info->control.rates[i].flags |=
778 IEEE80211_TX_RC_USE_CTS_PROTECT;
784 static ieee80211_tx_result debug_noinline
785 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
787 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
788 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
794 * Packet injection may want to control the sequence
795 * number, if we have no matching interface then we
796 * neither assign one ourselves nor ask the driver to.
798 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
801 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
804 if (ieee80211_hdrlen(hdr->frame_control) < 24)
807 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
811 * Anything but QoS data that has a sequence number field
812 * (is long enough) gets a sequence number from the global
815 if (!ieee80211_is_data_qos(hdr->frame_control)) {
816 /* driver should assign sequence number */
817 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
818 /* for pure STA mode without beacons, we can do it */
819 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
820 tx->sdata->sequence_number += 0x10;
825 * This should be true for injected/management frames only, for
826 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
827 * above since they are not QoS-data frames.
832 /* include per-STA, per-TID sequence counter */
834 qc = ieee80211_get_qos_ctl(hdr);
835 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
836 seq = &tx->sta->tid_seq[tid];
838 hdr->seq_ctrl = cpu_to_le16(*seq);
840 /* Increase the sequence number. */
841 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
846 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
847 struct sk_buff *skb, int hdrlen,
850 struct ieee80211_local *local = tx->local;
851 struct ieee80211_tx_info *info;
853 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
854 int pos = hdrlen + per_fragm;
855 int rem = skb->len - hdrlen - per_fragm;
857 if (WARN_ON(rem < 0))
860 /* first fragment was already added to queue by caller */
863 int fraglen = per_fragm;
868 tmp = dev_alloc_skb(local->tx_headroom +
870 IEEE80211_ENCRYPT_HEADROOM +
871 IEEE80211_ENCRYPT_TAILROOM);
875 __skb_queue_tail(&tx->skbs, tmp);
877 skb_reserve(tmp, local->tx_headroom +
878 IEEE80211_ENCRYPT_HEADROOM);
879 /* copy control information */
880 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
882 info = IEEE80211_SKB_CB(tmp);
883 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
884 IEEE80211_TX_CTL_FIRST_FRAGMENT);
887 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
889 skb_copy_queue_mapping(tmp, skb);
890 tmp->priority = skb->priority;
893 /* copy header and data */
894 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
895 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
900 /* adjust first fragment's length */
901 skb->len = hdrlen + per_fragm;
905 static ieee80211_tx_result debug_noinline
906 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
908 struct sk_buff *skb = tx->skb;
909 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
910 struct ieee80211_hdr *hdr = (void *)skb->data;
911 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
915 /* no matter what happens, tx->skb moves to tx->skbs */
916 __skb_queue_tail(&tx->skbs, skb);
919 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
922 if (tx->local->ops->set_frag_threshold)
926 * Warn when submitting a fragmented A-MPDU frame and drop it.
927 * This scenario is handled in ieee80211_tx_prepare but extra
928 * caution taken here as fragmented ampdu may cause Tx stop.
930 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
933 hdrlen = ieee80211_hdrlen(hdr->frame_control);
935 /* internal error, why isn't DONTFRAG set? */
936 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
940 * Now fragment the frame. This will allocate all the fragments and
941 * chain them (using skb as the first fragment) to skb->next.
942 * During transmission, we will remove the successfully transmitted
943 * fragments from this list. When the low-level driver rejects one
944 * of the fragments then we will simply pretend to accept the skb
945 * but store it away as pending.
947 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
950 /* update duration/seq/flags of fragments */
953 skb_queue_walk(&tx->skbs, skb) {
955 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
957 hdr = (void *)skb->data;
958 info = IEEE80211_SKB_CB(skb);
960 if (!skb_queue_is_last(&tx->skbs, skb)) {
961 hdr->frame_control |= morefrags;
963 * No multi-rate retries for fragmented frames, that
964 * would completely throw off the NAV at other STAs.
966 info->control.rates[1].idx = -1;
967 info->control.rates[2].idx = -1;
968 info->control.rates[3].idx = -1;
969 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
970 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
972 hdr->frame_control &= ~morefrags;
975 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
982 static ieee80211_tx_result debug_noinline
983 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
990 tx->sta->tx_packets++;
991 skb_queue_walk(&tx->skbs, skb) {
992 tx->sta->tx_fragments++;
993 tx->sta->tx_bytes += skb->len;
999 static ieee80211_tx_result debug_noinline
1000 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1005 switch (tx->key->conf.cipher) {
1006 case WLAN_CIPHER_SUITE_WEP40:
1007 case WLAN_CIPHER_SUITE_WEP104:
1008 return ieee80211_crypto_wep_encrypt(tx);
1009 case WLAN_CIPHER_SUITE_TKIP:
1010 return ieee80211_crypto_tkip_encrypt(tx);
1011 case WLAN_CIPHER_SUITE_CCMP:
1012 return ieee80211_crypto_ccmp_encrypt(tx);
1013 case WLAN_CIPHER_SUITE_AES_CMAC:
1014 return ieee80211_crypto_aes_cmac_encrypt(tx);
1016 return ieee80211_crypto_hw_encrypt(tx);
1022 static ieee80211_tx_result debug_noinline
1023 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1025 struct sk_buff *skb;
1026 struct ieee80211_hdr *hdr;
1030 skb_queue_walk(&tx->skbs, skb) {
1031 hdr = (void *) skb->data;
1032 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1033 break; /* must not overwrite AID */
1034 if (!skb_queue_is_last(&tx->skbs, skb)) {
1035 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1036 next_len = next->len;
1039 group_addr = is_multicast_ether_addr(hdr->addr1);
1042 ieee80211_duration(tx, skb, group_addr, next_len);
1048 /* actual transmit path */
1050 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1051 struct sk_buff *skb,
1052 struct ieee80211_tx_info *info,
1053 struct tid_ampdu_tx *tid_tx,
1056 bool queued = false;
1057 bool reset_agg_timer = false;
1058 struct sk_buff *purge_skb = NULL;
1060 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1061 info->flags |= IEEE80211_TX_CTL_AMPDU;
1062 reset_agg_timer = true;
1063 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1065 * nothing -- this aggregation session is being started
1066 * but that might still fail with the driver
1069 spin_lock(&tx->sta->lock);
1071 * Need to re-check now, because we may get here
1073 * 1) in the window during which the setup is actually
1074 * already done, but not marked yet because not all
1075 * packets are spliced over to the driver pending
1076 * queue yet -- if this happened we acquire the lock
1077 * either before or after the splice happens, but
1078 * need to recheck which of these cases happened.
1080 * 2) during session teardown, if the OPERATIONAL bit
1081 * was cleared due to the teardown but the pointer
1082 * hasn't been assigned NULL yet (or we loaded it
1083 * before it was assigned) -- in this case it may
1084 * now be NULL which means we should just let the
1085 * packet pass through because splicing the frames
1086 * back is already done.
1088 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1091 /* do nothing, let packet pass through */
1092 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1093 info->flags |= IEEE80211_TX_CTL_AMPDU;
1094 reset_agg_timer = true;
1097 info->control.vif = &tx->sdata->vif;
1098 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1099 __skb_queue_tail(&tid_tx->pending, skb);
1100 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1101 purge_skb = __skb_dequeue(&tid_tx->pending);
1103 spin_unlock(&tx->sta->lock);
1106 dev_kfree_skb(purge_skb);
1109 /* reset session timer */
1110 if (reset_agg_timer && tid_tx->timeout)
1111 tid_tx->last_tx = jiffies;
1119 static ieee80211_tx_result
1120 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1121 struct ieee80211_tx_data *tx,
1122 struct sk_buff *skb)
1124 struct ieee80211_local *local = sdata->local;
1125 struct ieee80211_hdr *hdr;
1126 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1130 memset(tx, 0, sizeof(*tx));
1134 __skb_queue_head_init(&tx->skbs);
1137 * If this flag is set to true anywhere, and we get here,
1138 * we are doing the needed processing, so remove the flag
1141 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1143 hdr = (struct ieee80211_hdr *) skb->data;
1145 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1146 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1147 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1149 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1150 tx->sdata->control_port_protocol == tx->skb->protocol) {
1151 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1154 tx->sta = sta_info_get(sdata, hdr->addr1);
1156 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1157 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1158 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1159 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1160 struct tid_ampdu_tx *tid_tx;
1162 qc = ieee80211_get_qos_ctl(hdr);
1163 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1165 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1169 queued = ieee80211_tx_prep_agg(tx, skb, info,
1172 if (unlikely(queued))
1177 if (is_multicast_ether_addr(hdr->addr1)) {
1178 tx->flags &= ~IEEE80211_TX_UNICAST;
1179 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1181 tx->flags |= IEEE80211_TX_UNICAST;
1183 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1184 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1185 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1186 info->flags & IEEE80211_TX_CTL_AMPDU)
1187 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1191 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1192 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1193 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1195 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1200 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1201 struct ieee80211_vif *vif,
1202 struct ieee80211_sta *sta,
1203 struct sk_buff_head *skbs,
1206 struct ieee80211_tx_control control;
1207 struct sk_buff *skb, *tmp;
1208 unsigned long flags;
1210 skb_queue_walk_safe(skbs, skb, tmp) {
1211 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1212 int q = info->hw_queue;
1214 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1215 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1216 __skb_unlink(skb, skbs);
1222 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1223 if (local->queue_stop_reasons[q] ||
1224 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1226 * Since queue is stopped, queue up frames for later
1227 * transmission from the tx-pending tasklet when the
1228 * queue is woken again.
1231 skb_queue_splice_init(skbs, &local->pending[q]);
1233 skb_queue_splice_tail_init(skbs,
1234 &local->pending[q]);
1236 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1240 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1242 info->control.vif = vif;
1245 __skb_unlink(skb, skbs);
1246 drv_tx(local, &control, skb);
1253 * Returns false if the frame couldn't be transmitted but was queued instead.
1255 static bool __ieee80211_tx(struct ieee80211_local *local,
1256 struct sk_buff_head *skbs, int led_len,
1257 struct sta_info *sta, bool txpending)
1259 struct ieee80211_tx_info *info;
1260 struct ieee80211_sub_if_data *sdata;
1261 struct ieee80211_vif *vif;
1262 struct ieee80211_sta *pubsta;
1263 struct sk_buff *skb;
1267 if (WARN_ON(skb_queue_empty(skbs)))
1270 skb = skb_peek(skbs);
1271 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1272 info = IEEE80211_SKB_CB(skb);
1273 sdata = vif_to_sdata(info->control.vif);
1274 if (sta && !sta->uploaded)
1282 switch (sdata->vif.type) {
1283 case NL80211_IFTYPE_MONITOR:
1284 sdata = rcu_dereference(local->monitor_sdata);
1288 vif->hw_queue[skb_get_queue_mapping(skb)];
1289 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1295 case NL80211_IFTYPE_AP_VLAN:
1296 sdata = container_of(sdata->bss,
1297 struct ieee80211_sub_if_data, u.ap);
1304 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1307 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1308 ieee80211_led_tx(local, 1);
1310 WARN_ON_ONCE(!skb_queue_empty(skbs));
1316 * Invoke TX handlers, return 0 on success and non-zero if the
1317 * frame was dropped or queued.
1319 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1321 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1322 ieee80211_tx_result res = TX_DROP;
1324 #define CALL_TXH(txh) \
1327 if (res != TX_CONTINUE) \
1331 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1332 CALL_TXH(ieee80211_tx_h_check_assoc);
1333 CALL_TXH(ieee80211_tx_h_ps_buf);
1334 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1335 CALL_TXH(ieee80211_tx_h_select_key);
1336 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1337 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1339 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1340 __skb_queue_tail(&tx->skbs, tx->skb);
1345 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1346 CALL_TXH(ieee80211_tx_h_sequence);
1347 CALL_TXH(ieee80211_tx_h_fragment);
1348 /* handlers after fragment must be aware of tx info fragmentation! */
1349 CALL_TXH(ieee80211_tx_h_stats);
1350 CALL_TXH(ieee80211_tx_h_encrypt);
1351 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1352 CALL_TXH(ieee80211_tx_h_calculate_duration);
1356 if (unlikely(res == TX_DROP)) {
1357 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1359 dev_kfree_skb(tx->skb);
1361 __skb_queue_purge(&tx->skbs);
1363 } else if (unlikely(res == TX_QUEUED)) {
1364 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1372 * Returns false if the frame couldn't be transmitted but was queued instead.
1374 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1375 struct sk_buff *skb, bool txpending)
1377 struct ieee80211_local *local = sdata->local;
1378 struct ieee80211_tx_data tx;
1379 ieee80211_tx_result res_prepare;
1380 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1384 if (unlikely(skb->len < 10)) {
1391 /* initialises tx */
1393 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1395 if (unlikely(res_prepare == TX_DROP)) {
1398 } else if (unlikely(res_prepare == TX_QUEUED)) {
1402 info->band = local->hw.conf.channel->band;
1404 /* set up hw_queue value early */
1405 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1406 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1408 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1410 if (!invoke_tx_handlers(&tx))
1411 result = __ieee80211_tx(local, &tx.skbs, led_len,
1418 /* device xmit handlers */
1420 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1421 struct sk_buff *skb,
1422 int head_need, bool may_encrypt)
1424 struct ieee80211_local *local = sdata->local;
1427 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1428 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1429 tail_need -= skb_tailroom(skb);
1430 tail_need = max_t(int, tail_need, 0);
1433 if (skb_cloned(skb))
1434 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1435 else if (head_need || tail_need)
1436 I802_DEBUG_INC(local->tx_expand_skb_head);
1440 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1441 wiphy_debug(local->hw.wiphy,
1442 "failed to reallocate TX buffer\n");
1449 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1451 struct ieee80211_local *local = sdata->local;
1452 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1453 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1459 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1461 headroom = local->tx_headroom;
1463 headroom += IEEE80211_ENCRYPT_HEADROOM;
1464 headroom -= skb_headroom(skb);
1465 headroom = max_t(int, 0, headroom);
1467 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1473 hdr = (struct ieee80211_hdr *) skb->data;
1474 info->control.vif = &sdata->vif;
1476 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1477 ieee80211_is_data(hdr->frame_control) &&
1478 !is_multicast_ether_addr(hdr->addr1) &&
1479 mesh_nexthop_resolve(skb, sdata)) {
1480 /* skb queued: don't free */
1485 ieee80211_set_qos_hdr(sdata, skb);
1486 ieee80211_tx(sdata, skb, false);
1490 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1492 struct ieee80211_radiotap_iterator iterator;
1493 struct ieee80211_radiotap_header *rthdr =
1494 (struct ieee80211_radiotap_header *) skb->data;
1495 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1496 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1500 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1501 IEEE80211_TX_CTL_DONTFRAG;
1504 * for every radiotap entry that is present
1505 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1506 * entries present, or -EINVAL on error)
1510 ret = ieee80211_radiotap_iterator_next(&iterator);
1515 /* see if this argument is something we can use */
1516 switch (iterator.this_arg_index) {
1518 * You must take care when dereferencing iterator.this_arg
1519 * for multibyte types... the pointer is not aligned. Use
1520 * get_unaligned((type *)iterator.this_arg) to dereference
1521 * iterator.this_arg for type "type" safely on all arches.
1523 case IEEE80211_RADIOTAP_FLAGS:
1524 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1526 * this indicates that the skb we have been
1527 * handed has the 32-bit FCS CRC at the end...
1528 * we should react to that by snipping it off
1529 * because it will be recomputed and added
1532 if (skb->len < (iterator._max_length + FCS_LEN))
1535 skb_trim(skb, skb->len - FCS_LEN);
1537 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1538 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1539 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1540 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1543 case IEEE80211_RADIOTAP_TX_FLAGS:
1544 txflags = get_unaligned_le16(iterator.this_arg);
1545 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1546 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1550 * Please update the file
1551 * Documentation/networking/mac80211-injection.txt
1552 * when parsing new fields here.
1560 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1564 * remove the radiotap header
1565 * iterator->_max_length was sanity-checked against
1566 * skb->len by iterator init
1568 skb_pull(skb, iterator._max_length);
1573 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1574 struct net_device *dev)
1576 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1577 struct ieee80211_channel *chan = local->hw.conf.channel;
1578 struct ieee80211_radiotap_header *prthdr =
1579 (struct ieee80211_radiotap_header *)skb->data;
1580 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1581 struct ieee80211_hdr *hdr;
1582 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1587 * Frame injection is not allowed if beaconing is not allowed
1588 * or if we need radar detection. Beaconing is usually not allowed when
1589 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1590 * Passive scan is also used in world regulatory domains where
1591 * your country is not known and as such it should be treated as
1592 * NO TX unless the channel is explicitly allowed in which case
1593 * your current regulatory domain would not have the passive scan
1596 * Since AP mode uses monitor interfaces to inject/TX management
1597 * frames we can make AP mode the exception to this rule once it
1598 * supports radar detection as its implementation can deal with
1599 * radar detection by itself. We can do that later by adding a
1600 * monitor flag interfaces used for AP support.
1602 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1603 IEEE80211_CHAN_PASSIVE_SCAN)))
1606 /* check for not even having the fixed radiotap header part */
1607 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1608 goto fail; /* too short to be possibly valid */
1610 /* is it a header version we can trust to find length from? */
1611 if (unlikely(prthdr->it_version))
1612 goto fail; /* only version 0 is supported */
1614 /* then there must be a radiotap header with a length we can use */
1615 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1617 /* does the skb contain enough to deliver on the alleged length? */
1618 if (unlikely(skb->len < len_rthdr))
1619 goto fail; /* skb too short for claimed rt header extent */
1622 * fix up the pointers accounting for the radiotap
1623 * header still being in there. We are being given
1624 * a precooked IEEE80211 header so no need for
1627 skb_set_mac_header(skb, len_rthdr);
1629 * these are just fixed to the end of the rt area since we
1630 * don't have any better information and at this point, nobody cares
1632 skb_set_network_header(skb, len_rthdr);
1633 skb_set_transport_header(skb, len_rthdr);
1635 if (skb->len < len_rthdr + 2)
1638 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1639 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1641 if (skb->len < len_rthdr + hdrlen)
1645 * Initialize skb->protocol if the injected frame is a data frame
1646 * carrying a rfc1042 header
1648 if (ieee80211_is_data(hdr->frame_control) &&
1649 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1650 u8 *payload = (u8 *)hdr + hdrlen;
1652 if (ether_addr_equal(payload, rfc1042_header))
1653 skb->protocol = cpu_to_be16((payload[6] << 8) |
1657 memset(info, 0, sizeof(*info));
1659 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1660 IEEE80211_TX_CTL_INJECTED;
1662 /* process and remove the injection radiotap header */
1663 if (!ieee80211_parse_tx_radiotap(skb))
1669 * We process outgoing injected frames that have a local address
1670 * we handle as though they are non-injected frames.
1671 * This code here isn't entirely correct, the local MAC address
1672 * isn't always enough to find the interface to use; for proper
1673 * VLAN/WDS support we will need a different mechanism (which
1674 * likely isn't going to be monitor interfaces).
1676 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1678 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1679 if (!ieee80211_sdata_running(tmp_sdata))
1681 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1682 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1683 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1685 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1691 ieee80211_xmit(sdata, skb);
1694 return NETDEV_TX_OK;
1698 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1702 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1703 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1704 * @skb: packet to be sent
1705 * @dev: incoming interface
1707 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1708 * not be freed, and caller is responsible for either retrying later or freeing
1711 * This function takes in an Ethernet header and encapsulates it with suitable
1712 * IEEE 802.11 header based on which interface the packet is coming in. The
1713 * encapsulated packet will then be passed to master interface, wlan#.11, for
1714 * transmission (through low-level driver).
1716 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1717 struct net_device *dev)
1719 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1720 struct ieee80211_local *local = sdata->local;
1721 struct ieee80211_tx_info *info;
1722 int ret = NETDEV_TX_BUSY, head_need;
1723 u16 ethertype, hdrlen, meshhdrlen = 0;
1725 struct ieee80211_hdr hdr;
1726 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1727 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1728 const u8 *encaps_data;
1729 int encaps_len, skip_header_bytes;
1731 struct sta_info *sta = NULL;
1732 bool wme_sta = false, authorized = false, tdls_auth = false;
1733 bool tdls_direct = false;
1738 if (unlikely(skb->len < ETH_HLEN)) {
1743 /* convert Ethernet header to proper 802.11 header (based on
1744 * operation mode) */
1745 ethertype = (skb->data[12] << 8) | skb->data[13];
1746 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1748 switch (sdata->vif.type) {
1749 case NL80211_IFTYPE_AP_VLAN:
1751 sta = rcu_dereference(sdata->u.vlan.sta);
1753 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1755 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1756 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1757 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1758 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1760 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1761 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1767 case NL80211_IFTYPE_AP:
1768 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1770 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1771 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1772 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1775 case NL80211_IFTYPE_WDS:
1776 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1778 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1779 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1780 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1781 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1784 #ifdef CONFIG_MAC80211_MESH
1785 case NL80211_IFTYPE_MESH_POINT:
1786 if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1787 /* Do not send frames with mesh_ttl == 0 */
1788 sdata->u.mesh.mshstats.dropped_frames_ttl++;
1793 if (!is_multicast_ether_addr(skb->data)) {
1794 mpath = mesh_path_lookup(skb->data, sdata);
1796 mppath = mpp_path_lookup(skb->data, sdata);
1800 * Use address extension if it is a packet from
1801 * another interface or if we know the destination
1802 * is being proxied by a portal (i.e. portal address
1803 * differs from proxied address)
1805 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1806 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1807 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1808 skb->data, skb->data + ETH_ALEN);
1810 meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1813 int is_mesh_mcast = 1;
1816 if (is_multicast_ether_addr(skb->data))
1817 /* DA TA mSA AE:SA */
1818 mesh_da = skb->data;
1820 static const u8 bcast[ETH_ALEN] =
1821 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
1823 /* RA TA mDA mSA AE:DA SA */
1824 mesh_da = mppath->mpp;
1827 mesh_da = mpath->dst;
1830 /* DA TA mSA AE:SA */
1834 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1835 mesh_da, sdata->vif.addr);
1839 ieee80211_new_mesh_header(&mesh_hdr,
1841 skb->data + ETH_ALEN,
1845 ieee80211_new_mesh_header(&mesh_hdr,
1848 skb->data + ETH_ALEN);
1853 case NL80211_IFTYPE_STATION:
1854 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1855 bool tdls_peer = false;
1858 sta = sta_info_get(sdata, skb->data);
1860 authorized = test_sta_flag(sta,
1861 WLAN_STA_AUTHORIZED);
1862 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1863 tdls_peer = test_sta_flag(sta,
1864 WLAN_STA_TDLS_PEER);
1865 tdls_auth = test_sta_flag(sta,
1866 WLAN_STA_TDLS_PEER_AUTH);
1871 * If the TDLS link is enabled, send everything
1872 * directly. Otherwise, allow TDLS setup frames
1873 * to be transmitted indirectly.
1875 tdls_direct = tdls_peer && (tdls_auth ||
1876 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1877 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1881 /* link during setup - throw out frames to peer */
1888 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1889 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1890 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1892 } else if (sdata->u.mgd.use_4addr &&
1893 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1894 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1895 IEEE80211_FCTL_TODS);
1897 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1898 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1899 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1900 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1903 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1905 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1906 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1907 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1911 case NL80211_IFTYPE_ADHOC:
1913 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1914 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1915 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1924 * There's no need to try to look up the destination
1925 * if it is a multicast address (which can only happen
1928 multicast = is_multicast_ether_addr(hdr.addr1);
1931 sta = sta_info_get(sdata, hdr.addr1);
1933 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1934 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1939 /* For mesh, the use of the QoS header is mandatory */
1940 if (ieee80211_vif_is_mesh(&sdata->vif))
1943 /* receiver and we are QoS enabled, use a QoS type frame */
1944 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1945 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1950 * Drop unicast frames to unauthorised stations unless they are
1951 * EAPOL frames from the local station.
1953 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1954 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1955 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1956 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1957 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1958 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1959 dev->name, hdr.addr1);
1962 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1968 if (unlikely(!multicast && skb->sk &&
1969 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1970 struct sk_buff *orig_skb = skb;
1972 skb = skb_clone(skb, GFP_ATOMIC);
1974 unsigned long flags;
1977 spin_lock_irqsave(&local->ack_status_lock, flags);
1978 r = idr_get_new_above(&local->ack_status_frames,
1981 idr_pre_get(&local->ack_status_frames,
1983 r = idr_get_new_above(&local->ack_status_frames,
1986 if (WARN_ON(!id) || id > 0xffff) {
1987 idr_remove(&local->ack_status_frames, id);
1990 spin_unlock_irqrestore(&local->ack_status_lock, flags);
1994 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1995 } else if (skb_shared(skb)) {
1996 kfree_skb(orig_skb);
2002 /* couldn't clone -- lose tx status ... */
2008 * If the skb is shared we need to obtain our own copy.
2010 if (skb_shared(skb)) {
2011 struct sk_buff *tmp_skb = skb;
2013 /* can't happen -- skb is a clone if info_id != 0 */
2016 skb = skb_clone(skb, GFP_ATOMIC);
2025 hdr.frame_control = fc;
2026 hdr.duration_id = 0;
2029 skip_header_bytes = ETH_HLEN;
2030 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2031 encaps_data = bridge_tunnel_header;
2032 encaps_len = sizeof(bridge_tunnel_header);
2033 skip_header_bytes -= 2;
2034 } else if (ethertype >= 0x600) {
2035 encaps_data = rfc1042_header;
2036 encaps_len = sizeof(rfc1042_header);
2037 skip_header_bytes -= 2;
2043 nh_pos = skb_network_header(skb) - skb->data;
2044 h_pos = skb_transport_header(skb) - skb->data;
2046 skb_pull(skb, skip_header_bytes);
2047 nh_pos -= skip_header_bytes;
2048 h_pos -= skip_header_bytes;
2050 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2053 * So we need to modify the skb header and hence need a copy of
2054 * that. The head_need variable above doesn't, so far, include
2055 * the needed header space that we don't need right away. If we
2056 * can, then we don't reallocate right now but only after the
2057 * frame arrives at the master device (if it does...)
2059 * If we cannot, however, then we will reallocate to include all
2060 * the ever needed space. Also, if we need to reallocate it anyway,
2061 * make it big enough for everything we may ever need.
2064 if (head_need > 0 || skb_cloned(skb)) {
2065 head_need += IEEE80211_ENCRYPT_HEADROOM;
2066 head_need += local->tx_headroom;
2067 head_need = max_t(int, 0, head_need);
2068 if (ieee80211_skb_resize(sdata, skb, head_need, true))
2073 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2074 nh_pos += encaps_len;
2075 h_pos += encaps_len;
2078 #ifdef CONFIG_MAC80211_MESH
2079 if (meshhdrlen > 0) {
2080 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2081 nh_pos += meshhdrlen;
2082 h_pos += meshhdrlen;
2086 if (ieee80211_is_data_qos(fc)) {
2087 __le16 *qos_control;
2089 qos_control = (__le16*) skb_push(skb, 2);
2090 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2092 * Maybe we could actually set some fields here, for now just
2093 * initialise to zero to indicate no special operation.
2097 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2102 dev->stats.tx_packets++;
2103 dev->stats.tx_bytes += skb->len;
2105 /* Update skb pointers to various headers since this modified frame
2106 * is going to go through Linux networking code that may potentially
2107 * need things like pointer to IP header. */
2108 skb_set_mac_header(skb, 0);
2109 skb_set_network_header(skb, nh_pos);
2110 skb_set_transport_header(skb, h_pos);
2112 info = IEEE80211_SKB_CB(skb);
2113 memset(info, 0, sizeof(*info));
2115 dev->trans_start = jiffies;
2117 info->flags = info_flags;
2118 info->ack_frame_id = info_id;
2120 ieee80211_xmit(sdata, skb);
2122 return NETDEV_TX_OK;
2125 if (ret == NETDEV_TX_OK)
2133 * ieee80211_clear_tx_pending may not be called in a context where
2134 * it is possible that it packets could come in again.
2136 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2140 for (i = 0; i < local->hw.queues; i++)
2141 skb_queue_purge(&local->pending[i]);
2145 * Returns false if the frame couldn't be transmitted but was queued instead,
2146 * which in this case means re-queued -- take as an indication to stop sending
2147 * more pending frames.
2149 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2150 struct sk_buff *skb)
2152 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2153 struct ieee80211_sub_if_data *sdata;
2154 struct sta_info *sta;
2155 struct ieee80211_hdr *hdr;
2158 sdata = vif_to_sdata(info->control.vif);
2160 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2161 result = ieee80211_tx(sdata, skb, true);
2163 struct sk_buff_head skbs;
2165 __skb_queue_head_init(&skbs);
2166 __skb_queue_tail(&skbs, skb);
2168 hdr = (struct ieee80211_hdr *)skb->data;
2169 sta = sta_info_get(sdata, hdr->addr1);
2171 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2178 * Transmit all pending packets. Called from tasklet.
2180 void ieee80211_tx_pending(unsigned long data)
2182 struct ieee80211_local *local = (struct ieee80211_local *)data;
2183 unsigned long flags;
2189 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2190 for (i = 0; i < local->hw.queues; i++) {
2192 * If queue is stopped by something other than due to pending
2193 * frames, or we have no pending frames, proceed to next queue.
2195 if (local->queue_stop_reasons[i] ||
2196 skb_queue_empty(&local->pending[i]))
2199 while (!skb_queue_empty(&local->pending[i])) {
2200 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2201 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2203 if (WARN_ON(!info->control.vif)) {
2208 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2211 txok = ieee80211_tx_pending_skb(local, skb);
2212 spin_lock_irqsave(&local->queue_stop_reason_lock,
2218 if (skb_queue_empty(&local->pending[i]))
2219 ieee80211_propagate_queue_wake(local, i);
2221 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2226 /* functions for drivers to get certain frames */
2228 static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2229 struct ieee80211_if_ap *bss,
2230 struct sk_buff *skb,
2231 struct beacon_data *beacon)
2235 int i, have_bits = 0, n1, n2;
2237 /* Generate bitmap for TIM only if there are any STAs in power save
2239 if (atomic_read(&bss->num_sta_ps) > 0)
2240 /* in the hope that this is faster than
2241 * checking byte-for-byte */
2242 have_bits = !bitmap_empty((unsigned long*)bss->tim,
2243 IEEE80211_MAX_AID+1);
2245 if (bss->dtim_count == 0)
2246 bss->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2250 tim = pos = (u8 *) skb_put(skb, 6);
2251 *pos++ = WLAN_EID_TIM;
2253 *pos++ = bss->dtim_count;
2254 *pos++ = sdata->vif.bss_conf.dtim_period;
2256 if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2259 bss->dtim_bc_mc = aid0 == 1;
2262 /* Find largest even number N1 so that bits numbered 1 through
2263 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2264 * (N2 + 1) x 8 through 2007 are 0. */
2266 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2273 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2280 /* Bitmap control */
2282 /* Part Virt Bitmap */
2283 skb_put(skb, n2 - n1);
2284 memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2286 tim[1] = n2 - n1 + 4;
2288 *pos++ = aid0; /* Bitmap control */
2289 *pos++ = 0; /* Part Virt Bitmap */
2293 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2294 struct ieee80211_vif *vif,
2295 u16 *tim_offset, u16 *tim_length)
2297 struct ieee80211_local *local = hw_to_local(hw);
2298 struct sk_buff *skb = NULL;
2299 struct ieee80211_tx_info *info;
2300 struct ieee80211_sub_if_data *sdata = NULL;
2301 struct ieee80211_if_ap *ap = NULL;
2302 struct beacon_data *beacon;
2303 struct ieee80211_supported_band *sband;
2304 enum ieee80211_band band = local->oper_channel->band;
2305 struct ieee80211_tx_rate_control txrc;
2307 sband = local->hw.wiphy->bands[band];
2311 sdata = vif_to_sdata(vif);
2313 if (!ieee80211_sdata_running(sdata))
2321 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2323 beacon = rcu_dereference(ap->beacon);
2326 * headroom, head length,
2327 * tail length and maximum TIM length
2329 skb = dev_alloc_skb(local->tx_headroom +
2331 beacon->tail_len + 256);
2335 skb_reserve(skb, local->tx_headroom);
2336 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2340 * Not very nice, but we want to allow the driver to call
2341 * ieee80211_beacon_get() as a response to the set_tim()
2342 * callback. That, however, is already invoked under the
2343 * sta_lock to guarantee consistent and race-free update
2344 * of the tim bitmap in mac80211 and the driver.
2346 if (local->tim_in_locked_section) {
2347 ieee80211_beacon_add_tim(sdata, ap, skb,
2350 unsigned long flags;
2352 spin_lock_irqsave(&local->tim_lock, flags);
2353 ieee80211_beacon_add_tim(sdata, ap, skb,
2355 spin_unlock_irqrestore(&local->tim_lock, flags);
2359 *tim_offset = beacon->head_len;
2361 *tim_length = skb->len - beacon->head_len;
2364 memcpy(skb_put(skb, beacon->tail_len),
2365 beacon->tail, beacon->tail_len);
2368 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2369 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2370 struct ieee80211_hdr *hdr;
2371 struct sk_buff *presp = rcu_dereference(ifibss->presp);
2376 skb = skb_copy(presp, GFP_ATOMIC);
2380 hdr = (struct ieee80211_hdr *) skb->data;
2381 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2382 IEEE80211_STYPE_BEACON);
2383 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2384 struct ieee80211_mgmt *mgmt;
2385 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2387 int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
2388 sizeof(mgmt->u.beacon);
2390 #ifdef CONFIG_MAC80211_MESH
2391 if (!sdata->u.mesh.mesh_id_len)
2395 if (ifmsh->sync_ops)
2396 ifmsh->sync_ops->adjust_tbtt(
2399 skb = dev_alloc_skb(local->tx_headroom +
2402 2 + 8 + /* supported rates */
2403 2 + 3 + /* DS params */
2404 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
2405 2 + sizeof(struct ieee80211_ht_cap) +
2406 2 + sizeof(struct ieee80211_ht_operation) +
2407 2 + sdata->u.mesh.mesh_id_len +
2408 2 + sizeof(struct ieee80211_meshconf_ie) +
2409 sdata->u.mesh.ie_len);
2413 skb_reserve(skb, local->hw.extra_tx_headroom);
2414 mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
2415 memset(mgmt, 0, hdr_len);
2416 mgmt->frame_control =
2417 cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2418 eth_broadcast_addr(mgmt->da);
2419 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2420 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2421 mgmt->u.beacon.beacon_int =
2422 cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2423 mgmt->u.beacon.capab_info |= cpu_to_le16(
2424 sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
2426 pos = skb_put(skb, 2);
2427 *pos++ = WLAN_EID_SSID;
2430 if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
2431 mesh_add_ds_params_ie(skb, sdata) ||
2432 ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
2433 mesh_add_rsn_ie(skb, sdata) ||
2434 mesh_add_ht_cap_ie(skb, sdata) ||
2435 mesh_add_ht_oper_ie(skb, sdata) ||
2436 mesh_add_meshid_ie(skb, sdata) ||
2437 mesh_add_meshconf_ie(skb, sdata) ||
2438 mesh_add_vendor_ies(skb, sdata)) {
2439 pr_err("o11s: couldn't add ies!\n");
2447 info = IEEE80211_SKB_CB(skb);
2449 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2450 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2453 memset(&txrc, 0, sizeof(txrc));
2456 txrc.bss_conf = &sdata->vif.bss_conf;
2458 txrc.reported_rate.idx = -1;
2459 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2460 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2461 txrc.max_rate_idx = -1;
2463 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2464 memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band],
2465 sizeof(txrc.rate_idx_mcs_mask));
2467 rate_control_get_rate(sdata, NULL, &txrc);
2469 info->control.vif = vif;
2471 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2472 IEEE80211_TX_CTL_ASSIGN_SEQ |
2473 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2478 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2480 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2481 struct ieee80211_vif *vif)
2483 struct ieee80211_if_ap *ap = NULL;
2484 struct sk_buff *presp = NULL, *skb = NULL;
2485 struct ieee80211_hdr *hdr;
2486 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2488 if (sdata->vif.type != NL80211_IFTYPE_AP)
2494 presp = rcu_dereference(ap->probe_resp);
2498 skb = skb_copy(presp, GFP_ATOMIC);
2502 hdr = (struct ieee80211_hdr *) skb->data;
2503 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2509 EXPORT_SYMBOL(ieee80211_proberesp_get);
2511 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2512 struct ieee80211_vif *vif)
2514 struct ieee80211_sub_if_data *sdata;
2515 struct ieee80211_if_managed *ifmgd;
2516 struct ieee80211_pspoll *pspoll;
2517 struct ieee80211_local *local;
2518 struct sk_buff *skb;
2520 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2523 sdata = vif_to_sdata(vif);
2524 ifmgd = &sdata->u.mgd;
2525 local = sdata->local;
2527 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2531 skb_reserve(skb, local->hw.extra_tx_headroom);
2533 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2534 memset(pspoll, 0, sizeof(*pspoll));
2535 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2536 IEEE80211_STYPE_PSPOLL);
2537 pspoll->aid = cpu_to_le16(ifmgd->aid);
2539 /* aid in PS-Poll has its two MSBs each set to 1 */
2540 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2542 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2543 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2547 EXPORT_SYMBOL(ieee80211_pspoll_get);
2549 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2550 struct ieee80211_vif *vif)
2552 struct ieee80211_hdr_3addr *nullfunc;
2553 struct ieee80211_sub_if_data *sdata;
2554 struct ieee80211_if_managed *ifmgd;
2555 struct ieee80211_local *local;
2556 struct sk_buff *skb;
2558 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2561 sdata = vif_to_sdata(vif);
2562 ifmgd = &sdata->u.mgd;
2563 local = sdata->local;
2565 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2569 skb_reserve(skb, local->hw.extra_tx_headroom);
2571 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2573 memset(nullfunc, 0, sizeof(*nullfunc));
2574 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2575 IEEE80211_STYPE_NULLFUNC |
2576 IEEE80211_FCTL_TODS);
2577 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2578 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2579 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2583 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2585 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2586 struct ieee80211_vif *vif,
2587 const u8 *ssid, size_t ssid_len,
2588 const u8 *ie, size_t ie_len)
2590 struct ieee80211_sub_if_data *sdata;
2591 struct ieee80211_local *local;
2592 struct ieee80211_hdr_3addr *hdr;
2593 struct sk_buff *skb;
2597 sdata = vif_to_sdata(vif);
2598 local = sdata->local;
2599 ie_ssid_len = 2 + ssid_len;
2601 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2602 ie_ssid_len + ie_len);
2606 skb_reserve(skb, local->hw.extra_tx_headroom);
2608 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2609 memset(hdr, 0, sizeof(*hdr));
2610 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2611 IEEE80211_STYPE_PROBE_REQ);
2612 eth_broadcast_addr(hdr->addr1);
2613 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2614 eth_broadcast_addr(hdr->addr3);
2616 pos = skb_put(skb, ie_ssid_len);
2617 *pos++ = WLAN_EID_SSID;
2620 memcpy(pos, ssid, ssid_len);
2624 pos = skb_put(skb, ie_len);
2625 memcpy(pos, ie, ie_len);
2630 EXPORT_SYMBOL(ieee80211_probereq_get);
2632 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2633 const void *frame, size_t frame_len,
2634 const struct ieee80211_tx_info *frame_txctl,
2635 struct ieee80211_rts *rts)
2637 const struct ieee80211_hdr *hdr = frame;
2639 rts->frame_control =
2640 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2641 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2643 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2644 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2646 EXPORT_SYMBOL(ieee80211_rts_get);
2648 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2649 const void *frame, size_t frame_len,
2650 const struct ieee80211_tx_info *frame_txctl,
2651 struct ieee80211_cts *cts)
2653 const struct ieee80211_hdr *hdr = frame;
2655 cts->frame_control =
2656 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2657 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2658 frame_len, frame_txctl);
2659 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2661 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2664 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2665 struct ieee80211_vif *vif)
2667 struct ieee80211_local *local = hw_to_local(hw);
2668 struct sk_buff *skb = NULL;
2669 struct ieee80211_tx_data tx;
2670 struct ieee80211_sub_if_data *sdata;
2671 struct ieee80211_if_ap *bss = NULL;
2672 struct beacon_data *beacon;
2673 struct ieee80211_tx_info *info;
2675 sdata = vif_to_sdata(vif);
2679 beacon = rcu_dereference(bss->beacon);
2681 if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2684 if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2685 goto out; /* send buffered bc/mc only after DTIM beacon */
2688 skb = skb_dequeue(&bss->ps_bc_buf);
2691 local->total_ps_buffered--;
2693 if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2694 struct ieee80211_hdr *hdr =
2695 (struct ieee80211_hdr *) skb->data;
2696 /* more buffered multicast/broadcast frames ==> set
2697 * MoreData flag in IEEE 802.11 header to inform PS
2699 hdr->frame_control |=
2700 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2703 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2705 dev_kfree_skb_any(skb);
2708 info = IEEE80211_SKB_CB(skb);
2710 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2711 info->band = local->oper_channel->band;
2713 if (invoke_tx_handlers(&tx))
2720 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2722 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
2723 struct sk_buff *skb, int tid)
2725 int ac = ieee802_1d_to_ac[tid & 7];
2727 skb_set_mac_header(skb, 0);
2728 skb_set_network_header(skb, 0);
2729 skb_set_transport_header(skb, 0);
2731 skb_set_queue_mapping(skb, ac);
2732 skb->priority = tid;
2735 * The other path calling ieee80211_xmit is from the tasklet,
2736 * and while we can handle concurrent transmissions locking
2737 * requirements are that we do not come into tx with bhs on.
2740 ieee80211_xmit(sdata, skb);