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, shift = 0;
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);
49 struct ieee80211_chanctx_conf *chanctx_conf;
53 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
55 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
56 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
60 /* assume HW handles this */
61 if (tx->rate.flags & IEEE80211_TX_RC_MCS)
65 if (WARN_ON_ONCE(tx->rate.idx < 0))
68 sband = local->hw.wiphy->bands[info->band];
69 txrate = &sband->bitrates[tx->rate.idx];
71 erp = txrate->flags & IEEE80211_RATE_ERP_G;
74 * data and mgmt (except PS Poll):
76 * - during contention period:
77 * if addr1 is group address: 0
78 * if more fragments = 0 and addr1 is individual address: time to
79 * transmit one ACK plus SIFS
80 * if more fragments = 1 and addr1 is individual address: time to
81 * transmit next fragment plus 2 x ACK plus 3 x SIFS
84 * - control response frame (CTS or ACK) shall be transmitted using the
85 * same rate as the immediately previous frame in the frame exchange
86 * sequence, if this rate belongs to the PHY mandatory rates, or else
87 * at the highest possible rate belonging to the PHY rates in the
90 hdr = (struct ieee80211_hdr *)skb->data;
91 if (ieee80211_is_ctl(hdr->frame_control)) {
92 /* TODO: These control frames are not currently sent by
93 * mac80211, but should they be implemented, this function
94 * needs to be updated to support duration field calculation.
96 * RTS: time needed to transmit pending data/mgmt frame plus
97 * one CTS frame plus one ACK frame plus 3 x SIFS
98 * CTS: duration of immediately previous RTS minus time
99 * required to transmit CTS and its SIFS
100 * ACK: 0 if immediately previous directed data/mgmt had
101 * more=0, with more=1 duration in ACK frame is duration
102 * from previous frame minus time needed to transmit ACK
104 * PS Poll: BIT(15) | BIT(14) | aid
110 if (0 /* FIX: data/mgmt during CFP */)
111 return cpu_to_le16(32768);
113 if (group_addr) /* Group address as the destination - no ACK */
116 /* Individual destination address:
117 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
118 * CTS and ACK frames shall be transmitted using the highest rate in
119 * basic rate set that is less than or equal to the rate of the
120 * immediately previous frame and that is using the same modulation
121 * (CCK or OFDM). If no basic rate set matches with these requirements,
122 * the highest mandatory rate of the PHY that is less than or equal to
123 * the rate of the previous frame is used.
124 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
127 /* use lowest available if everything fails */
128 mrate = sband->bitrates[0].bitrate;
129 for (i = 0; i < sband->n_bitrates; i++) {
130 struct ieee80211_rate *r = &sband->bitrates[i];
132 if (r->bitrate > txrate->bitrate)
135 if ((rate_flags & r->flags) != rate_flags)
138 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
139 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
141 switch (sband->band) {
142 case IEEE80211_BAND_2GHZ: {
144 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
145 flag = IEEE80211_RATE_MANDATORY_G;
147 flag = IEEE80211_RATE_MANDATORY_B;
152 case IEEE80211_BAND_5GHZ:
153 if (r->flags & IEEE80211_RATE_MANDATORY_A)
156 case IEEE80211_BAND_60GHZ:
157 /* TODO, for now fall through */
158 case IEEE80211_NUM_BANDS:
164 /* No matching basic rate found; use highest suitable mandatory
166 rate = DIV_ROUND_UP(mrate, 1 << shift);
169 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
170 if (ieee80211_is_data_qos(hdr->frame_control) &&
171 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
174 /* Time needed to transmit ACK
175 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
176 * to closest integer */
177 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
178 tx->sdata->vif.bss_conf.use_short_preamble,
182 /* Frame is fragmented: duration increases with time needed to
183 * transmit next fragment plus ACK and 2 x SIFS. */
184 dur *= 2; /* ACK + SIFS */
186 dur += ieee80211_frame_duration(sband->band, next_frag_len,
187 txrate->bitrate, erp,
188 tx->sdata->vif.bss_conf.use_short_preamble,
192 return cpu_to_le16(dur);
196 static ieee80211_tx_result debug_noinline
197 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
199 struct ieee80211_local *local = tx->local;
200 struct ieee80211_if_managed *ifmgd;
202 /* driver doesn't support power save */
203 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
206 /* hardware does dynamic power save */
207 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
210 /* dynamic power save disabled */
211 if (local->hw.conf.dynamic_ps_timeout <= 0)
214 /* we are scanning, don't enable power save */
218 if (!local->ps_sdata)
221 /* No point if we're going to suspend */
222 if (local->quiescing)
225 /* dynamic ps is supported only in managed mode */
226 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
229 ifmgd = &tx->sdata->u.mgd;
232 * Don't wakeup from power save if u-apsd is enabled, voip ac has
233 * u-apsd enabled and the frame is in voip class. This effectively
234 * means that even if all access categories have u-apsd enabled, in
235 * practise u-apsd is only used with the voip ac. This is a
236 * workaround for the case when received voip class packets do not
237 * have correct qos tag for some reason, due the network or the
240 * Note: ifmgd->uapsd_queues access is racy here. If the value is
241 * changed via debugfs, user needs to reassociate manually to have
242 * everything in sync.
244 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
245 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
246 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
249 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
250 ieee80211_stop_queues_by_reason(&local->hw,
251 IEEE80211_MAX_QUEUE_MAP,
252 IEEE80211_QUEUE_STOP_REASON_PS);
253 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
254 ieee80211_queue_work(&local->hw,
255 &local->dynamic_ps_disable_work);
258 /* Don't restart the timer if we're not disassociated */
259 if (!ifmgd->associated)
262 mod_timer(&local->dynamic_ps_timer, jiffies +
263 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
268 static ieee80211_tx_result debug_noinline
269 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
272 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
273 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
276 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
279 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
280 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
281 !ieee80211_is_probe_req(hdr->frame_control) &&
282 !ieee80211_is_nullfunc(hdr->frame_control))
284 * When software scanning only nullfunc frames (to notify
285 * the sleep state to the AP) and probe requests (for the
286 * active scan) are allowed, all other frames should not be
287 * sent and we should not get here, but if we do
288 * nonetheless, drop them to avoid sending them
289 * off-channel. See the link below and
290 * ieee80211_start_scan() for more.
292 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
296 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
299 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
302 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
306 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
308 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
309 if (unlikely(!assoc &&
310 ieee80211_is_data(hdr->frame_control))) {
311 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
312 sdata_info(tx->sdata,
313 "dropped data frame to not associated station %pM\n",
316 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
319 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
320 ieee80211_is_data(hdr->frame_control) &&
321 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
323 * No associated STAs - no need to send multicast
332 /* This function is called whenever the AP is about to exceed the maximum limit
333 * of buffered frames for power saving STAs. This situation should not really
334 * happen often during normal operation, so dropping the oldest buffered packet
335 * from each queue should be OK to make some room for new frames. */
336 static void purge_old_ps_buffers(struct ieee80211_local *local)
338 int total = 0, purged = 0;
340 struct ieee80211_sub_if_data *sdata;
341 struct sta_info *sta;
343 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
346 if (sdata->vif.type == NL80211_IFTYPE_AP)
347 ps = &sdata->u.ap.ps;
348 else if (ieee80211_vif_is_mesh(&sdata->vif))
349 ps = &sdata->u.mesh.ps;
353 skb = skb_dequeue(&ps->bc_buf);
358 total += skb_queue_len(&ps->bc_buf);
362 * Drop one frame from each station from the lowest-priority
363 * AC that has frames at all.
365 list_for_each_entry_rcu(sta, &local->sta_list, list) {
368 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
369 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
370 total += skb_queue_len(&sta->ps_tx_buf[ac]);
373 ieee80211_free_txskb(&local->hw, skb);
379 local->total_ps_buffered = total;
380 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
383 static ieee80211_tx_result
384 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
386 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
387 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
391 * broadcast/multicast frame
393 * If any of the associated/peer stations is in power save mode,
394 * the frame is buffered to be sent after DTIM beacon frame.
395 * This is done either by the hardware or us.
398 /* powersaving STAs currently only in AP/VLAN/mesh mode */
399 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
400 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
404 ps = &tx->sdata->bss->ps;
405 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
406 ps = &tx->sdata->u.mesh.ps;
412 /* no buffering for ordered frames */
413 if (ieee80211_has_order(hdr->frame_control))
416 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
417 info->hw_queue = tx->sdata->vif.cab_queue;
419 /* no stations in PS mode */
420 if (!atomic_read(&ps->num_sta_ps))
423 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
425 /* device releases frame after DTIM beacon */
426 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
429 /* buffered in mac80211 */
430 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
431 purge_old_ps_buffers(tx->local);
433 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
435 "BC TX buffer full - dropping the oldest frame\n");
436 dev_kfree_skb(skb_dequeue(&ps->bc_buf));
438 tx->local->total_ps_buffered++;
440 skb_queue_tail(&ps->bc_buf, tx->skb);
445 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
448 if (!ieee80211_is_mgmt(fc))
451 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
454 if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
461 static ieee80211_tx_result
462 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
464 struct sta_info *sta = tx->sta;
465 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
466 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
467 struct ieee80211_local *local = tx->local;
472 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
473 test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
474 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
475 int ac = skb_get_queue_mapping(tx->skb);
477 /* only deauth, disassoc and action are bufferable MMPDUs */
478 if (ieee80211_is_mgmt(hdr->frame_control) &&
479 !ieee80211_is_deauth(hdr->frame_control) &&
480 !ieee80211_is_disassoc(hdr->frame_control) &&
481 !ieee80211_is_action(hdr->frame_control)) {
482 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
486 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
487 sta->sta.addr, sta->sta.aid, ac);
488 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
489 purge_old_ps_buffers(tx->local);
490 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
491 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
493 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
495 ieee80211_free_txskb(&local->hw, old);
497 tx->local->total_ps_buffered++;
499 info->control.jiffies = jiffies;
500 info->control.vif = &tx->sdata->vif;
501 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
502 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
504 if (!timer_pending(&local->sta_cleanup))
505 mod_timer(&local->sta_cleanup,
506 round_jiffies(jiffies +
507 STA_INFO_CLEANUP_INTERVAL));
510 * We queued up some frames, so the TIM bit might
511 * need to be set, recalculate it.
513 sta_info_recalc_tim(sta);
516 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
518 "STA %pM in PS mode, but polling/in SP -> send frame\n",
525 static ieee80211_tx_result debug_noinline
526 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
528 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
531 if (tx->flags & IEEE80211_TX_UNICAST)
532 return ieee80211_tx_h_unicast_ps_buf(tx);
534 return ieee80211_tx_h_multicast_ps_buf(tx);
537 static ieee80211_tx_result debug_noinline
538 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
540 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
542 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
543 tx->sdata->control_port_no_encrypt))
544 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
549 static ieee80211_tx_result debug_noinline
550 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
552 struct ieee80211_key *key;
553 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
554 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
556 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
558 else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
560 else if (ieee80211_is_mgmt(hdr->frame_control) &&
561 is_multicast_ether_addr(hdr->addr1) &&
562 ieee80211_is_robust_mgmt_frame(hdr) &&
563 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
565 else if (is_multicast_ether_addr(hdr->addr1) &&
566 (key = rcu_dereference(tx->sdata->default_multicast_key)))
568 else if (!is_multicast_ether_addr(hdr->addr1) &&
569 (key = rcu_dereference(tx->sdata->default_unicast_key)))
571 else if (info->flags & IEEE80211_TX_CTL_INJECTED)
573 else if (!tx->sdata->drop_unencrypted)
575 else if (tx->skb->protocol == tx->sdata->control_port_protocol)
577 else if (ieee80211_is_robust_mgmt_frame(hdr) &&
578 !(ieee80211_is_action(hdr->frame_control) &&
579 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
581 else if (ieee80211_is_mgmt(hdr->frame_control) &&
582 !ieee80211_is_robust_mgmt_frame(hdr))
585 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
590 bool skip_hw = false;
592 tx->key->tx_rx_count++;
593 /* TODO: add threshold stuff again */
595 switch (tx->key->conf.cipher) {
596 case WLAN_CIPHER_SUITE_WEP40:
597 case WLAN_CIPHER_SUITE_WEP104:
598 case WLAN_CIPHER_SUITE_TKIP:
599 if (!ieee80211_is_data_present(hdr->frame_control))
602 case WLAN_CIPHER_SUITE_CCMP:
603 if (!ieee80211_is_data_present(hdr->frame_control) &&
604 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
608 skip_hw = (tx->key->conf.flags &
609 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
610 ieee80211_is_mgmt(hdr->frame_control);
612 case WLAN_CIPHER_SUITE_AES_CMAC:
613 if (!ieee80211_is_mgmt(hdr->frame_control))
618 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
619 !ieee80211_is_deauth(hdr->frame_control)))
622 if (!skip_hw && tx->key &&
623 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
624 info->control.hw_key = &tx->key->conf;
630 static ieee80211_tx_result debug_noinline
631 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
633 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
634 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
635 struct ieee80211_supported_band *sband;
637 struct ieee80211_tx_rate_control txrc;
638 struct ieee80211_sta_rates *ratetbl = NULL;
641 memset(&txrc, 0, sizeof(txrc));
643 sband = tx->local->hw.wiphy->bands[info->band];
645 len = min_t(u32, tx->skb->len + FCS_LEN,
646 tx->local->hw.wiphy->frag_threshold);
648 /* set up the tx rate control struct we give the RC algo */
649 txrc.hw = &tx->local->hw;
651 txrc.bss_conf = &tx->sdata->vif.bss_conf;
653 txrc.reported_rate.idx = -1;
654 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
655 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
656 txrc.max_rate_idx = -1;
658 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
660 if (tx->sdata->rc_has_mcs_mask[info->band])
661 txrc.rate_idx_mcs_mask =
662 tx->sdata->rc_rateidx_mcs_mask[info->band];
664 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
665 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
666 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
668 /* set up RTS protection if desired */
669 if (len > tx->local->hw.wiphy->rts_threshold) {
673 info->control.use_rts = txrc.rts;
674 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
677 * Use short preamble if the BSS can handle it, but not for
678 * management frames unless we know the receiver can handle
679 * that -- the management frame might be to a station that
680 * just wants a probe response.
682 if (tx->sdata->vif.bss_conf.use_short_preamble &&
683 (ieee80211_is_data(hdr->frame_control) ||
684 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
685 txrc.short_preamble = true;
687 info->control.short_preamble = txrc.short_preamble;
690 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
693 * Lets not bother rate control if we're associated and cannot
694 * talk to the sta. This should not happen.
696 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
697 !rate_usable_index_exists(sband, &tx->sta->sta),
698 "%s: Dropped data frame as no usable bitrate found while "
699 "scanning and associated. Target station: "
700 "%pM on %d GHz band\n",
701 tx->sdata->name, hdr->addr1,
706 * If we're associated with the sta at this point we know we can at
707 * least send the frame at the lowest bit rate.
709 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
711 if (tx->sta && !info->control.skip_table)
712 ratetbl = rcu_dereference(tx->sta->sta.rates);
714 if (unlikely(info->control.rates[0].idx < 0)) {
716 struct ieee80211_tx_rate rate = {
717 .idx = ratetbl->rate[0].idx,
718 .flags = ratetbl->rate[0].flags,
719 .count = ratetbl->rate[0].count
722 if (ratetbl->rate[0].idx < 0)
730 tx->rate = info->control.rates[0];
733 if (txrc.reported_rate.idx < 0) {
734 txrc.reported_rate = tx->rate;
735 if (tx->sta && ieee80211_is_data(hdr->frame_control))
736 tx->sta->last_tx_rate = txrc.reported_rate;
738 tx->sta->last_tx_rate = txrc.reported_rate;
743 if (unlikely(!info->control.rates[0].count))
744 info->control.rates[0].count = 1;
746 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
747 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
748 info->control.rates[0].count = 1;
753 static ieee80211_tx_result debug_noinline
754 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
756 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
757 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
763 * Packet injection may want to control the sequence
764 * number, if we have no matching interface then we
765 * neither assign one ourselves nor ask the driver to.
767 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
770 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
773 if (ieee80211_hdrlen(hdr->frame_control) < 24)
776 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
780 * Anything but QoS data that has a sequence number field
781 * (is long enough) gets a sequence number from the global
784 if (!ieee80211_is_data_qos(hdr->frame_control)) {
785 /* driver should assign sequence number */
786 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
787 /* for pure STA mode without beacons, we can do it */
788 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
789 tx->sdata->sequence_number += 0x10;
794 * This should be true for injected/management frames only, for
795 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
796 * above since they are not QoS-data frames.
801 /* include per-STA, per-TID sequence counter */
803 qc = ieee80211_get_qos_ctl(hdr);
804 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
805 seq = &tx->sta->tid_seq[tid];
807 hdr->seq_ctrl = cpu_to_le16(*seq);
809 /* Increase the sequence number. */
810 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
815 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
816 struct sk_buff *skb, int hdrlen,
819 struct ieee80211_local *local = tx->local;
820 struct ieee80211_tx_info *info;
822 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
823 int pos = hdrlen + per_fragm;
824 int rem = skb->len - hdrlen - per_fragm;
826 if (WARN_ON(rem < 0))
829 /* first fragment was already added to queue by caller */
832 int fraglen = per_fragm;
837 tmp = dev_alloc_skb(local->tx_headroom +
839 IEEE80211_ENCRYPT_HEADROOM +
840 IEEE80211_ENCRYPT_TAILROOM);
844 __skb_queue_tail(&tx->skbs, tmp);
846 skb_reserve(tmp, local->tx_headroom +
847 IEEE80211_ENCRYPT_HEADROOM);
848 /* copy control information */
849 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
851 info = IEEE80211_SKB_CB(tmp);
852 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
853 IEEE80211_TX_CTL_FIRST_FRAGMENT);
856 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
858 skb_copy_queue_mapping(tmp, skb);
859 tmp->priority = skb->priority;
862 /* copy header and data */
863 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
864 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
869 /* adjust first fragment's length */
870 skb->len = hdrlen + per_fragm;
874 static ieee80211_tx_result debug_noinline
875 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
877 struct sk_buff *skb = tx->skb;
878 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
879 struct ieee80211_hdr *hdr = (void *)skb->data;
880 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
884 /* no matter what happens, tx->skb moves to tx->skbs */
885 __skb_queue_tail(&tx->skbs, skb);
888 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
891 if (tx->local->ops->set_frag_threshold)
895 * Warn when submitting a fragmented A-MPDU frame and drop it.
896 * This scenario is handled in ieee80211_tx_prepare but extra
897 * caution taken here as fragmented ampdu may cause Tx stop.
899 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
902 hdrlen = ieee80211_hdrlen(hdr->frame_control);
904 /* internal error, why isn't DONTFRAG set? */
905 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
909 * Now fragment the frame. This will allocate all the fragments and
910 * chain them (using skb as the first fragment) to skb->next.
911 * During transmission, we will remove the successfully transmitted
912 * fragments from this list. When the low-level driver rejects one
913 * of the fragments then we will simply pretend to accept the skb
914 * but store it away as pending.
916 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
919 /* update duration/seq/flags of fragments */
922 skb_queue_walk(&tx->skbs, skb) {
923 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
925 hdr = (void *)skb->data;
926 info = IEEE80211_SKB_CB(skb);
928 if (!skb_queue_is_last(&tx->skbs, skb)) {
929 hdr->frame_control |= morefrags;
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 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
938 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
940 hdr->frame_control &= ~morefrags;
942 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
949 static ieee80211_tx_result debug_noinline
950 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
958 skb_queue_walk(&tx->skbs, skb) {
959 ac = skb_get_queue_mapping(skb);
960 tx->sta->tx_fragments++;
961 tx->sta->tx_bytes[ac] += skb->len;
964 tx->sta->tx_packets[ac]++;
969 static ieee80211_tx_result debug_noinline
970 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
975 switch (tx->key->conf.cipher) {
976 case WLAN_CIPHER_SUITE_WEP40:
977 case WLAN_CIPHER_SUITE_WEP104:
978 return ieee80211_crypto_wep_encrypt(tx);
979 case WLAN_CIPHER_SUITE_TKIP:
980 return ieee80211_crypto_tkip_encrypt(tx);
981 case WLAN_CIPHER_SUITE_CCMP:
982 return ieee80211_crypto_ccmp_encrypt(tx);
983 case WLAN_CIPHER_SUITE_AES_CMAC:
984 return ieee80211_crypto_aes_cmac_encrypt(tx);
986 return ieee80211_crypto_hw_encrypt(tx);
992 static ieee80211_tx_result debug_noinline
993 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
996 struct ieee80211_hdr *hdr;
1000 skb_queue_walk(&tx->skbs, skb) {
1001 hdr = (void *) skb->data;
1002 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1003 break; /* must not overwrite AID */
1004 if (!skb_queue_is_last(&tx->skbs, skb)) {
1005 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1006 next_len = next->len;
1009 group_addr = is_multicast_ether_addr(hdr->addr1);
1012 ieee80211_duration(tx, skb, group_addr, next_len);
1018 /* actual transmit path */
1020 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1021 struct sk_buff *skb,
1022 struct ieee80211_tx_info *info,
1023 struct tid_ampdu_tx *tid_tx,
1026 bool queued = false;
1027 bool reset_agg_timer = false;
1028 struct sk_buff *purge_skb = NULL;
1030 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1031 info->flags |= IEEE80211_TX_CTL_AMPDU;
1032 reset_agg_timer = true;
1033 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1035 * nothing -- this aggregation session is being started
1036 * but that might still fail with the driver
1039 spin_lock(&tx->sta->lock);
1041 * Need to re-check now, because we may get here
1043 * 1) in the window during which the setup is actually
1044 * already done, but not marked yet because not all
1045 * packets are spliced over to the driver pending
1046 * queue yet -- if this happened we acquire the lock
1047 * either before or after the splice happens, but
1048 * need to recheck which of these cases happened.
1050 * 2) during session teardown, if the OPERATIONAL bit
1051 * was cleared due to the teardown but the pointer
1052 * hasn't been assigned NULL yet (or we loaded it
1053 * before it was assigned) -- in this case it may
1054 * now be NULL which means we should just let the
1055 * packet pass through because splicing the frames
1056 * back is already done.
1058 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1061 /* do nothing, let packet pass through */
1062 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1063 info->flags |= IEEE80211_TX_CTL_AMPDU;
1064 reset_agg_timer = true;
1067 info->control.vif = &tx->sdata->vif;
1068 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1069 __skb_queue_tail(&tid_tx->pending, skb);
1070 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1071 purge_skb = __skb_dequeue(&tid_tx->pending);
1073 spin_unlock(&tx->sta->lock);
1076 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1079 /* reset session timer */
1080 if (reset_agg_timer && tid_tx->timeout)
1081 tid_tx->last_tx = jiffies;
1089 static ieee80211_tx_result
1090 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1091 struct ieee80211_tx_data *tx,
1092 struct sk_buff *skb)
1094 struct ieee80211_local *local = sdata->local;
1095 struct ieee80211_hdr *hdr;
1096 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1100 memset(tx, 0, sizeof(*tx));
1104 __skb_queue_head_init(&tx->skbs);
1107 * If this flag is set to true anywhere, and we get here,
1108 * we are doing the needed processing, so remove the flag
1111 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1113 hdr = (struct ieee80211_hdr *) skb->data;
1115 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1116 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1117 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1119 } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1120 tx->sdata->control_port_protocol == tx->skb->protocol) {
1121 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1124 tx->sta = sta_info_get(sdata, hdr->addr1);
1126 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1127 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1128 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1129 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1130 struct tid_ampdu_tx *tid_tx;
1132 qc = ieee80211_get_qos_ctl(hdr);
1133 tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1135 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1139 queued = ieee80211_tx_prep_agg(tx, skb, info,
1142 if (unlikely(queued))
1147 if (is_multicast_ether_addr(hdr->addr1)) {
1148 tx->flags &= ~IEEE80211_TX_UNICAST;
1149 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1151 tx->flags |= IEEE80211_TX_UNICAST;
1153 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1154 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1155 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1156 info->flags & IEEE80211_TX_CTL_AMPDU)
1157 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1161 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1162 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1163 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1165 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1170 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1171 struct ieee80211_vif *vif,
1172 struct ieee80211_sta *sta,
1173 struct sk_buff_head *skbs,
1176 struct ieee80211_tx_control control;
1177 struct sk_buff *skb, *tmp;
1178 unsigned long flags;
1180 skb_queue_walk_safe(skbs, skb, tmp) {
1181 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1182 int q = info->hw_queue;
1184 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1185 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1186 __skb_unlink(skb, skbs);
1187 ieee80211_free_txskb(&local->hw, skb);
1192 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1193 if (local->queue_stop_reasons[q] ||
1194 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1195 if (unlikely(info->flags &
1196 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1197 if (local->queue_stop_reasons[q] &
1198 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1200 * Drop off-channel frames if queues
1201 * are stopped for any reason other
1202 * than off-channel operation. Never
1205 spin_unlock_irqrestore(
1206 &local->queue_stop_reason_lock,
1208 ieee80211_purge_tx_queue(&local->hw,
1215 * Since queue is stopped, queue up frames for
1216 * later transmission from the tx-pending
1217 * tasklet when the queue is woken again.
1220 skb_queue_splice_init(skbs,
1221 &local->pending[q]);
1223 skb_queue_splice_tail_init(skbs,
1224 &local->pending[q]);
1226 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1231 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1233 info->control.vif = vif;
1236 __skb_unlink(skb, skbs);
1237 drv_tx(local, &control, skb);
1244 * Returns false if the frame couldn't be transmitted but was queued instead.
1246 static bool __ieee80211_tx(struct ieee80211_local *local,
1247 struct sk_buff_head *skbs, int led_len,
1248 struct sta_info *sta, bool txpending)
1250 struct ieee80211_tx_info *info;
1251 struct ieee80211_sub_if_data *sdata;
1252 struct ieee80211_vif *vif;
1253 struct ieee80211_sta *pubsta;
1254 struct sk_buff *skb;
1258 if (WARN_ON(skb_queue_empty(skbs)))
1261 skb = skb_peek(skbs);
1262 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1263 info = IEEE80211_SKB_CB(skb);
1264 sdata = vif_to_sdata(info->control.vif);
1265 if (sta && !sta->uploaded)
1273 switch (sdata->vif.type) {
1274 case NL80211_IFTYPE_MONITOR:
1275 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
1279 sdata = rcu_dereference(local->monitor_sdata);
1283 vif->hw_queue[skb_get_queue_mapping(skb)];
1284 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1290 case NL80211_IFTYPE_AP_VLAN:
1291 sdata = container_of(sdata->bss,
1292 struct ieee80211_sub_if_data, u.ap);
1299 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1302 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1303 ieee80211_led_tx(local, 1);
1305 WARN_ON_ONCE(!skb_queue_empty(skbs));
1311 * Invoke TX handlers, return 0 on success and non-zero if the
1312 * frame was dropped or queued.
1314 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1316 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1317 ieee80211_tx_result res = TX_DROP;
1319 #define CALL_TXH(txh) \
1322 if (res != TX_CONTINUE) \
1326 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1327 CALL_TXH(ieee80211_tx_h_check_assoc);
1328 CALL_TXH(ieee80211_tx_h_ps_buf);
1329 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1330 CALL_TXH(ieee80211_tx_h_select_key);
1331 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1332 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1334 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1335 __skb_queue_tail(&tx->skbs, tx->skb);
1340 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1341 CALL_TXH(ieee80211_tx_h_sequence);
1342 CALL_TXH(ieee80211_tx_h_fragment);
1343 /* handlers after fragment must be aware of tx info fragmentation! */
1344 CALL_TXH(ieee80211_tx_h_stats);
1345 CALL_TXH(ieee80211_tx_h_encrypt);
1346 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1347 CALL_TXH(ieee80211_tx_h_calculate_duration);
1351 if (unlikely(res == TX_DROP)) {
1352 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1354 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1356 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1358 } else if (unlikely(res == TX_QUEUED)) {
1359 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1367 * Returns false if the frame couldn't be transmitted but was queued instead.
1369 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1370 struct sk_buff *skb, bool txpending,
1371 enum ieee80211_band band)
1373 struct ieee80211_local *local = sdata->local;
1374 struct ieee80211_tx_data tx;
1375 ieee80211_tx_result res_prepare;
1376 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1380 if (unlikely(skb->len < 10)) {
1385 /* initialises tx */
1387 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1389 if (unlikely(res_prepare == TX_DROP)) {
1390 ieee80211_free_txskb(&local->hw, skb);
1392 } else if (unlikely(res_prepare == TX_QUEUED)) {
1398 /* set up hw_queue value early */
1399 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1400 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1402 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1404 if (!invoke_tx_handlers(&tx))
1405 result = __ieee80211_tx(local, &tx.skbs, led_len,
1411 /* device xmit handlers */
1413 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1414 struct sk_buff *skb,
1415 int head_need, bool may_encrypt)
1417 struct ieee80211_local *local = sdata->local;
1420 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1421 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1422 tail_need -= skb_tailroom(skb);
1423 tail_need = max_t(int, tail_need, 0);
1426 if (skb_cloned(skb))
1427 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1428 else if (head_need || tail_need)
1429 I802_DEBUG_INC(local->tx_expand_skb_head);
1433 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1434 wiphy_debug(local->hw.wiphy,
1435 "failed to reallocate TX buffer\n");
1442 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
1443 enum ieee80211_band band)
1445 struct ieee80211_local *local = sdata->local;
1446 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1447 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1451 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1453 headroom = local->tx_headroom;
1455 headroom += IEEE80211_ENCRYPT_HEADROOM;
1456 headroom -= skb_headroom(skb);
1457 headroom = max_t(int, 0, headroom);
1459 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1460 ieee80211_free_txskb(&local->hw, skb);
1464 hdr = (struct ieee80211_hdr *) skb->data;
1465 info->control.vif = &sdata->vif;
1467 if (ieee80211_vif_is_mesh(&sdata->vif)) {
1468 if (ieee80211_is_data(hdr->frame_control) &&
1469 is_unicast_ether_addr(hdr->addr1)) {
1470 if (mesh_nexthop_resolve(sdata, skb))
1471 return; /* skb queued: don't free */
1473 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
1477 ieee80211_set_qos_hdr(sdata, skb);
1478 ieee80211_tx(sdata, skb, false, band);
1481 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1483 struct ieee80211_radiotap_iterator iterator;
1484 struct ieee80211_radiotap_header *rthdr =
1485 (struct ieee80211_radiotap_header *) skb->data;
1486 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1487 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1491 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1492 IEEE80211_TX_CTL_DONTFRAG;
1495 * for every radiotap entry that is present
1496 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1497 * entries present, or -EINVAL on error)
1501 ret = ieee80211_radiotap_iterator_next(&iterator);
1506 /* see if this argument is something we can use */
1507 switch (iterator.this_arg_index) {
1509 * You must take care when dereferencing iterator.this_arg
1510 * for multibyte types... the pointer is not aligned. Use
1511 * get_unaligned((type *)iterator.this_arg) to dereference
1512 * iterator.this_arg for type "type" safely on all arches.
1514 case IEEE80211_RADIOTAP_FLAGS:
1515 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1517 * this indicates that the skb we have been
1518 * handed has the 32-bit FCS CRC at the end...
1519 * we should react to that by snipping it off
1520 * because it will be recomputed and added
1523 if (skb->len < (iterator._max_length + FCS_LEN))
1526 skb_trim(skb, skb->len - FCS_LEN);
1528 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1529 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1530 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1531 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1534 case IEEE80211_RADIOTAP_TX_FLAGS:
1535 txflags = get_unaligned_le16(iterator.this_arg);
1536 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1537 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1541 * Please update the file
1542 * Documentation/networking/mac80211-injection.txt
1543 * when parsing new fields here.
1551 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1555 * remove the radiotap header
1556 * iterator->_max_length was sanity-checked against
1557 * skb->len by iterator init
1559 skb_pull(skb, iterator._max_length);
1564 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1565 struct net_device *dev)
1567 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1568 struct ieee80211_chanctx_conf *chanctx_conf;
1569 struct ieee80211_channel *chan;
1570 struct ieee80211_radiotap_header *prthdr =
1571 (struct ieee80211_radiotap_header *)skb->data;
1572 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1573 struct ieee80211_hdr *hdr;
1574 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1578 /* check for not even having the fixed radiotap header part */
1579 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1580 goto fail; /* too short to be possibly valid */
1582 /* is it a header version we can trust to find length from? */
1583 if (unlikely(prthdr->it_version))
1584 goto fail; /* only version 0 is supported */
1586 /* then there must be a radiotap header with a length we can use */
1587 len_rthdr = ieee80211_get_radiotap_len(skb->data);
1589 /* does the skb contain enough to deliver on the alleged length? */
1590 if (unlikely(skb->len < len_rthdr))
1591 goto fail; /* skb too short for claimed rt header extent */
1594 * fix up the pointers accounting for the radiotap
1595 * header still being in there. We are being given
1596 * a precooked IEEE80211 header so no need for
1599 skb_set_mac_header(skb, len_rthdr);
1601 * these are just fixed to the end of the rt area since we
1602 * don't have any better information and at this point, nobody cares
1604 skb_set_network_header(skb, len_rthdr);
1605 skb_set_transport_header(skb, len_rthdr);
1607 if (skb->len < len_rthdr + 2)
1610 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1611 hdrlen = ieee80211_hdrlen(hdr->frame_control);
1613 if (skb->len < len_rthdr + hdrlen)
1617 * Initialize skb->protocol if the injected frame is a data frame
1618 * carrying a rfc1042 header
1620 if (ieee80211_is_data(hdr->frame_control) &&
1621 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1622 u8 *payload = (u8 *)hdr + hdrlen;
1624 if (ether_addr_equal(payload, rfc1042_header))
1625 skb->protocol = cpu_to_be16((payload[6] << 8) |
1629 memset(info, 0, sizeof(*info));
1631 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1632 IEEE80211_TX_CTL_INJECTED;
1634 /* process and remove the injection radiotap header */
1635 if (!ieee80211_parse_tx_radiotap(skb))
1641 * We process outgoing injected frames that have a local address
1642 * we handle as though they are non-injected frames.
1643 * This code here isn't entirely correct, the local MAC address
1644 * isn't always enough to find the interface to use; for proper
1645 * VLAN/WDS support we will need a different mechanism (which
1646 * likely isn't going to be monitor interfaces).
1648 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1650 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1651 if (!ieee80211_sdata_running(tmp_sdata))
1653 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1654 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1655 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1657 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1663 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1664 if (!chanctx_conf) {
1665 tmp_sdata = rcu_dereference(local->monitor_sdata);
1668 rcu_dereference(tmp_sdata->vif.chanctx_conf);
1672 chan = chanctx_conf->def.chan;
1673 else if (!local->use_chanctx)
1674 chan = local->_oper_chandef.chan;
1679 * Frame injection is not allowed if beaconing is not allowed
1680 * or if we need radar detection. Beaconing is usually not allowed when
1681 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1682 * Passive scan is also used in world regulatory domains where
1683 * your country is not known and as such it should be treated as
1684 * NO TX unless the channel is explicitly allowed in which case
1685 * your current regulatory domain would not have the passive scan
1688 * Since AP mode uses monitor interfaces to inject/TX management
1689 * frames we can make AP mode the exception to this rule once it
1690 * supports radar detection as its implementation can deal with
1691 * radar detection by itself. We can do that later by adding a
1692 * monitor flag interfaces used for AP support.
1694 if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1695 IEEE80211_CHAN_PASSIVE_SCAN)))
1698 ieee80211_xmit(sdata, skb, chan->band);
1701 return NETDEV_TX_OK;
1707 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1711 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1712 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1713 * @skb: packet to be sent
1714 * @dev: incoming interface
1716 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1717 * not be freed, and caller is responsible for either retrying later or freeing
1720 * This function takes in an Ethernet header and encapsulates it with suitable
1721 * IEEE 802.11 header based on which interface the packet is coming in. The
1722 * encapsulated packet will then be passed to master interface, wlan#.11, for
1723 * transmission (through low-level driver).
1725 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1726 struct net_device *dev)
1728 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1729 struct ieee80211_local *local = sdata->local;
1730 struct ieee80211_tx_info *info;
1732 u16 ethertype, hdrlen, meshhdrlen = 0;
1734 struct ieee80211_hdr hdr;
1735 struct ieee80211s_hdr mesh_hdr __maybe_unused;
1736 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1737 const u8 *encaps_data;
1738 int encaps_len, skip_header_bytes;
1740 struct sta_info *sta = NULL;
1741 bool wme_sta = false, authorized = false, tdls_auth = false;
1742 bool tdls_direct = false;
1746 struct ieee80211_chanctx_conf *chanctx_conf;
1747 struct ieee80211_sub_if_data *ap_sdata;
1748 enum ieee80211_band band;
1750 if (unlikely(skb->len < ETH_HLEN))
1753 /* convert Ethernet header to proper 802.11 header (based on
1754 * operation mode) */
1755 ethertype = (skb->data[12] << 8) | skb->data[13];
1756 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1760 switch (sdata->vif.type) {
1761 case NL80211_IFTYPE_AP_VLAN:
1762 sta = rcu_dereference(sdata->u.vlan.sta);
1764 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1766 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1767 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1768 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1769 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1771 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1772 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1774 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1776 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
1779 band = chanctx_conf->def.chan->band;
1783 case NL80211_IFTYPE_AP:
1784 if (sdata->vif.type == NL80211_IFTYPE_AP)
1785 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1788 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1790 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1791 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1792 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1794 band = chanctx_conf->def.chan->band;
1796 case NL80211_IFTYPE_WDS:
1797 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1799 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1800 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1801 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1802 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1805 * This is the exception! WDS style interfaces are prohibited
1806 * when channel contexts are in used so this must be valid
1808 band = local->hw.conf.chandef.chan->band;
1810 #ifdef CONFIG_MAC80211_MESH
1811 case NL80211_IFTYPE_MESH_POINT:
1812 if (!is_multicast_ether_addr(skb->data)) {
1813 struct sta_info *next_hop;
1814 bool mpp_lookup = true;
1816 mpath = mesh_path_lookup(sdata, skb->data);
1819 next_hop = rcu_dereference(mpath->next_hop);
1821 !(mpath->flags & (MESH_PATH_ACTIVE |
1822 MESH_PATH_RESOLVING)))
1827 mppath = mpp_path_lookup(sdata, skb->data);
1829 if (mppath && mpath)
1830 mesh_path_del(mpath->sdata, mpath->dst);
1834 * Use address extension if it is a packet from
1835 * another interface or if we know the destination
1836 * is being proxied by a portal (i.e. portal address
1837 * differs from proxied address)
1839 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1840 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1841 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1842 skb->data, skb->data + ETH_ALEN);
1843 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
1846 /* DS -> MBSS (802.11-2012 13.11.3.3).
1847 * For unicast with unknown forwarding information,
1848 * destination might be in the MBSS or if that fails
1849 * forwarded to another mesh gate. In either case
1850 * resolution will be handled in ieee80211_xmit(), so
1851 * leave the original DA. This also works for mcast */
1852 const u8 *mesh_da = skb->data;
1855 mesh_da = mppath->mpp;
1857 mesh_da = mpath->dst;
1859 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1860 mesh_da, sdata->vif.addr);
1861 if (is_multicast_ether_addr(mesh_da))
1862 /* DA TA mSA AE:SA */
1863 meshhdrlen = ieee80211_new_mesh_header(
1865 skb->data + ETH_ALEN, NULL);
1867 /* RA TA mDA mSA AE:DA SA */
1868 meshhdrlen = ieee80211_new_mesh_header(
1869 sdata, &mesh_hdr, skb->data,
1870 skb->data + ETH_ALEN);
1873 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1876 band = chanctx_conf->def.chan->band;
1879 case NL80211_IFTYPE_STATION:
1880 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1881 bool tdls_peer = false;
1883 sta = sta_info_get(sdata, skb->data);
1885 authorized = test_sta_flag(sta,
1886 WLAN_STA_AUTHORIZED);
1887 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1888 tdls_peer = test_sta_flag(sta,
1889 WLAN_STA_TDLS_PEER);
1890 tdls_auth = test_sta_flag(sta,
1891 WLAN_STA_TDLS_PEER_AUTH);
1895 * If the TDLS link is enabled, send everything
1896 * directly. Otherwise, allow TDLS setup frames
1897 * to be transmitted indirectly.
1899 tdls_direct = tdls_peer && (tdls_auth ||
1900 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1901 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1905 /* link during setup - throw out frames to peer */
1910 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1911 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1912 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1914 } else if (sdata->u.mgd.use_4addr &&
1915 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1916 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1917 IEEE80211_FCTL_TODS);
1919 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1920 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1921 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1922 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1925 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1927 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1928 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1929 memcpy(hdr.addr3, skb->data, ETH_ALEN);
1932 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1935 band = chanctx_conf->def.chan->band;
1937 case NL80211_IFTYPE_ADHOC:
1939 memcpy(hdr.addr1, skb->data, ETH_ALEN);
1940 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1941 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1943 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1946 band = chanctx_conf->def.chan->band;
1953 * There's no need to try to look up the destination
1954 * if it is a multicast address (which can only happen
1957 multicast = is_multicast_ether_addr(hdr.addr1);
1959 sta = sta_info_get(sdata, hdr.addr1);
1961 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1962 wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1966 /* For mesh, the use of the QoS header is mandatory */
1967 if (ieee80211_vif_is_mesh(&sdata->vif))
1970 /* receiver and we are QoS enabled, use a QoS type frame */
1971 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1972 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1977 * Drop unicast frames to unauthorised stations unless they are
1978 * EAPOL frames from the local station.
1980 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1981 !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1982 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1983 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1984 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1985 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1986 dev->name, hdr.addr1);
1989 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1994 if (unlikely(!multicast && skb->sk &&
1995 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1996 struct sk_buff *orig_skb = skb;
1998 skb = skb_clone(skb, GFP_ATOMIC);
2000 unsigned long flags;
2003 spin_lock_irqsave(&local->ack_status_lock, flags);
2004 id = idr_alloc(&local->ack_status_frames, orig_skb,
2005 1, 0x10000, GFP_ATOMIC);
2006 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2010 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2011 } else if (skb_shared(skb)) {
2012 kfree_skb(orig_skb);
2018 /* couldn't clone -- lose tx status ... */
2024 * If the skb is shared we need to obtain our own copy.
2026 if (skb_shared(skb)) {
2027 struct sk_buff *tmp_skb = skb;
2029 /* can't happen -- skb is a clone if info_id != 0 */
2032 skb = skb_clone(skb, GFP_ATOMIC);
2039 hdr.frame_control = fc;
2040 hdr.duration_id = 0;
2043 skip_header_bytes = ETH_HLEN;
2044 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2045 encaps_data = bridge_tunnel_header;
2046 encaps_len = sizeof(bridge_tunnel_header);
2047 skip_header_bytes -= 2;
2048 } else if (ethertype >= ETH_P_802_3_MIN) {
2049 encaps_data = rfc1042_header;
2050 encaps_len = sizeof(rfc1042_header);
2051 skip_header_bytes -= 2;
2057 nh_pos = skb_network_header(skb) - skb->data;
2058 h_pos = skb_transport_header(skb) - skb->data;
2060 skb_pull(skb, skip_header_bytes);
2061 nh_pos -= skip_header_bytes;
2062 h_pos -= skip_header_bytes;
2064 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2067 * So we need to modify the skb header and hence need a copy of
2068 * that. The head_need variable above doesn't, so far, include
2069 * the needed header space that we don't need right away. If we
2070 * can, then we don't reallocate right now but only after the
2071 * frame arrives at the master device (if it does...)
2073 * If we cannot, however, then we will reallocate to include all
2074 * the ever needed space. Also, if we need to reallocate it anyway,
2075 * make it big enough for everything we may ever need.
2078 if (head_need > 0 || skb_cloned(skb)) {
2079 head_need += IEEE80211_ENCRYPT_HEADROOM;
2080 head_need += local->tx_headroom;
2081 head_need = max_t(int, 0, head_need);
2082 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2083 ieee80211_free_txskb(&local->hw, skb);
2090 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2091 nh_pos += encaps_len;
2092 h_pos += encaps_len;
2095 #ifdef CONFIG_MAC80211_MESH
2096 if (meshhdrlen > 0) {
2097 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2098 nh_pos += meshhdrlen;
2099 h_pos += meshhdrlen;
2103 if (ieee80211_is_data_qos(fc)) {
2104 __le16 *qos_control;
2106 qos_control = (__le16*) skb_push(skb, 2);
2107 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2109 * Maybe we could actually set some fields here, for now just
2110 * initialise to zero to indicate no special operation.
2114 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2119 dev->stats.tx_packets++;
2120 dev->stats.tx_bytes += skb->len;
2122 /* Update skb pointers to various headers since this modified frame
2123 * is going to go through Linux networking code that may potentially
2124 * need things like pointer to IP header. */
2125 skb_set_mac_header(skb, 0);
2126 skb_set_network_header(skb, nh_pos);
2127 skb_set_transport_header(skb, h_pos);
2129 info = IEEE80211_SKB_CB(skb);
2130 memset(info, 0, sizeof(*info));
2132 dev->trans_start = jiffies;
2134 info->flags = info_flags;
2135 info->ack_frame_id = info_id;
2137 ieee80211_xmit(sdata, skb, band);
2140 return NETDEV_TX_OK;
2146 return NETDEV_TX_OK;
2151 * ieee80211_clear_tx_pending may not be called in a context where
2152 * it is possible that it packets could come in again.
2154 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2156 struct sk_buff *skb;
2159 for (i = 0; i < local->hw.queues; i++) {
2160 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2161 ieee80211_free_txskb(&local->hw, skb);
2166 * Returns false if the frame couldn't be transmitted but was queued instead,
2167 * which in this case means re-queued -- take as an indication to stop sending
2168 * more pending frames.
2170 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2171 struct sk_buff *skb)
2173 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2174 struct ieee80211_sub_if_data *sdata;
2175 struct sta_info *sta;
2176 struct ieee80211_hdr *hdr;
2178 struct ieee80211_chanctx_conf *chanctx_conf;
2180 sdata = vif_to_sdata(info->control.vif);
2182 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2183 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2184 if (unlikely(!chanctx_conf)) {
2188 result = ieee80211_tx(sdata, skb, true,
2189 chanctx_conf->def.chan->band);
2191 struct sk_buff_head skbs;
2193 __skb_queue_head_init(&skbs);
2194 __skb_queue_tail(&skbs, skb);
2196 hdr = (struct ieee80211_hdr *)skb->data;
2197 sta = sta_info_get(sdata, hdr->addr1);
2199 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2206 * Transmit all pending packets. Called from tasklet.
2208 void ieee80211_tx_pending(unsigned long data)
2210 struct ieee80211_local *local = (struct ieee80211_local *)data;
2211 unsigned long flags;
2217 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2218 for (i = 0; i < local->hw.queues; i++) {
2220 * If queue is stopped by something other than due to pending
2221 * frames, or we have no pending frames, proceed to next queue.
2223 if (local->queue_stop_reasons[i] ||
2224 skb_queue_empty(&local->pending[i]))
2227 while (!skb_queue_empty(&local->pending[i])) {
2228 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2229 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2231 if (WARN_ON(!info->control.vif)) {
2232 ieee80211_free_txskb(&local->hw, skb);
2236 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2239 txok = ieee80211_tx_pending_skb(local, skb);
2240 spin_lock_irqsave(&local->queue_stop_reason_lock,
2246 if (skb_queue_empty(&local->pending[i]))
2247 ieee80211_propagate_queue_wake(local, i);
2249 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2254 /* functions for drivers to get certain frames */
2256 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2257 struct ps_data *ps, struct sk_buff *skb)
2261 int i, have_bits = 0, n1, n2;
2263 /* Generate bitmap for TIM only if there are any STAs in power save
2265 if (atomic_read(&ps->num_sta_ps) > 0)
2266 /* in the hope that this is faster than
2267 * checking byte-for-byte */
2268 have_bits = !bitmap_empty((unsigned long*)ps->tim,
2269 IEEE80211_MAX_AID+1);
2271 if (ps->dtim_count == 0)
2272 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2276 tim = pos = (u8 *) skb_put(skb, 6);
2277 *pos++ = WLAN_EID_TIM;
2279 *pos++ = ps->dtim_count;
2280 *pos++ = sdata->vif.bss_conf.dtim_period;
2282 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
2285 ps->dtim_bc_mc = aid0 == 1;
2288 /* Find largest even number N1 so that bits numbered 1 through
2289 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2290 * (N2 + 1) x 8 through 2007 are 0. */
2292 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2299 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2306 /* Bitmap control */
2308 /* Part Virt Bitmap */
2309 skb_put(skb, n2 - n1);
2310 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
2312 tim[1] = n2 - n1 + 4;
2314 *pos++ = aid0; /* Bitmap control */
2315 *pos++ = 0; /* Part Virt Bitmap */
2319 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2320 struct ps_data *ps, struct sk_buff *skb)
2322 struct ieee80211_local *local = sdata->local;
2325 * Not very nice, but we want to allow the driver to call
2326 * ieee80211_beacon_get() as a response to the set_tim()
2327 * callback. That, however, is already invoked under the
2328 * sta_lock to guarantee consistent and race-free update
2329 * of the tim bitmap in mac80211 and the driver.
2331 if (local->tim_in_locked_section) {
2332 __ieee80211_beacon_add_tim(sdata, ps, skb);
2334 spin_lock_bh(&local->tim_lock);
2335 __ieee80211_beacon_add_tim(sdata, ps, skb);
2336 spin_unlock_bh(&local->tim_lock);
2342 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2343 struct ieee80211_vif *vif,
2344 u16 *tim_offset, u16 *tim_length)
2346 struct ieee80211_local *local = hw_to_local(hw);
2347 struct sk_buff *skb = NULL;
2348 struct ieee80211_tx_info *info;
2349 struct ieee80211_sub_if_data *sdata = NULL;
2350 enum ieee80211_band band;
2351 struct ieee80211_tx_rate_control txrc;
2352 struct ieee80211_chanctx_conf *chanctx_conf;
2356 sdata = vif_to_sdata(vif);
2357 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2359 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
2367 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2368 struct ieee80211_if_ap *ap = &sdata->u.ap;
2369 struct beacon_data *beacon = rcu_dereference(ap->beacon);
2373 * headroom, head length,
2374 * tail length and maximum TIM length
2376 skb = dev_alloc_skb(local->tx_headroom +
2378 beacon->tail_len + 256);
2382 skb_reserve(skb, local->tx_headroom);
2383 memcpy(skb_put(skb, beacon->head_len), beacon->head,
2386 ieee80211_beacon_add_tim(sdata, &ap->ps, skb);
2389 *tim_offset = beacon->head_len;
2391 *tim_length = skb->len - beacon->head_len;
2394 memcpy(skb_put(skb, beacon->tail_len),
2395 beacon->tail, beacon->tail_len);
2398 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2399 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2400 struct ieee80211_hdr *hdr;
2401 struct beacon_data *presp = rcu_dereference(ifibss->presp);
2406 skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
2409 skb_reserve(skb, local->tx_headroom);
2410 memcpy(skb_put(skb, presp->head_len), presp->head,
2413 hdr = (struct ieee80211_hdr *) skb->data;
2414 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2415 IEEE80211_STYPE_BEACON);
2416 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2417 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2418 struct beacon_data *bcn = rcu_dereference(ifmsh->beacon);
2423 if (ifmsh->sync_ops)
2424 ifmsh->sync_ops->adjust_tbtt(
2427 skb = dev_alloc_skb(local->tx_headroom +
2433 skb_reserve(skb, local->tx_headroom);
2434 memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len);
2435 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb);
2436 memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len);
2442 band = chanctx_conf->def.chan->band;
2444 info = IEEE80211_SKB_CB(skb);
2446 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2447 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2450 memset(&txrc, 0, sizeof(txrc));
2452 txrc.sband = local->hw.wiphy->bands[band];
2453 txrc.bss_conf = &sdata->vif.bss_conf;
2455 txrc.reported_rate.idx = -1;
2456 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2457 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1)
2458 txrc.max_rate_idx = -1;
2460 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2462 rate_control_get_rate(sdata, NULL, &txrc);
2464 info->control.vif = vif;
2466 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2467 IEEE80211_TX_CTL_ASSIGN_SEQ |
2468 IEEE80211_TX_CTL_FIRST_FRAGMENT;
2473 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2475 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2476 struct ieee80211_vif *vif)
2478 struct ieee80211_if_ap *ap = NULL;
2479 struct sk_buff *skb = NULL;
2480 struct probe_resp *presp = NULL;
2481 struct ieee80211_hdr *hdr;
2482 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2484 if (sdata->vif.type != NL80211_IFTYPE_AP)
2490 presp = rcu_dereference(ap->probe_resp);
2494 skb = dev_alloc_skb(presp->len);
2498 memcpy(skb_put(skb, presp->len), presp->data, presp->len);
2500 hdr = (struct ieee80211_hdr *) skb->data;
2501 memset(hdr->addr1, 0, sizeof(hdr->addr1));
2507 EXPORT_SYMBOL(ieee80211_proberesp_get);
2509 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2510 struct ieee80211_vif *vif)
2512 struct ieee80211_sub_if_data *sdata;
2513 struct ieee80211_if_managed *ifmgd;
2514 struct ieee80211_pspoll *pspoll;
2515 struct ieee80211_local *local;
2516 struct sk_buff *skb;
2518 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2521 sdata = vif_to_sdata(vif);
2522 ifmgd = &sdata->u.mgd;
2523 local = sdata->local;
2525 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2529 skb_reserve(skb, local->hw.extra_tx_headroom);
2531 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2532 memset(pspoll, 0, sizeof(*pspoll));
2533 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2534 IEEE80211_STYPE_PSPOLL);
2535 pspoll->aid = cpu_to_le16(ifmgd->aid);
2537 /* aid in PS-Poll has its two MSBs each set to 1 */
2538 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2540 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2541 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2545 EXPORT_SYMBOL(ieee80211_pspoll_get);
2547 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2548 struct ieee80211_vif *vif)
2550 struct ieee80211_hdr_3addr *nullfunc;
2551 struct ieee80211_sub_if_data *sdata;
2552 struct ieee80211_if_managed *ifmgd;
2553 struct ieee80211_local *local;
2554 struct sk_buff *skb;
2556 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2559 sdata = vif_to_sdata(vif);
2560 ifmgd = &sdata->u.mgd;
2561 local = sdata->local;
2563 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2567 skb_reserve(skb, local->hw.extra_tx_headroom);
2569 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2571 memset(nullfunc, 0, sizeof(*nullfunc));
2572 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2573 IEEE80211_STYPE_NULLFUNC |
2574 IEEE80211_FCTL_TODS);
2575 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2576 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2577 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2581 EXPORT_SYMBOL(ieee80211_nullfunc_get);
2583 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2584 struct ieee80211_vif *vif,
2585 const u8 *ssid, size_t ssid_len,
2588 struct ieee80211_sub_if_data *sdata;
2589 struct ieee80211_local *local;
2590 struct ieee80211_hdr_3addr *hdr;
2591 struct sk_buff *skb;
2595 sdata = vif_to_sdata(vif);
2596 local = sdata->local;
2597 ie_ssid_len = 2 + ssid_len;
2599 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2600 ie_ssid_len + tailroom);
2604 skb_reserve(skb, local->hw.extra_tx_headroom);
2606 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2607 memset(hdr, 0, sizeof(*hdr));
2608 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2609 IEEE80211_STYPE_PROBE_REQ);
2610 eth_broadcast_addr(hdr->addr1);
2611 memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2612 eth_broadcast_addr(hdr->addr3);
2614 pos = skb_put(skb, ie_ssid_len);
2615 *pos++ = WLAN_EID_SSID;
2618 memcpy(pos, ssid, ssid_len);
2623 EXPORT_SYMBOL(ieee80211_probereq_get);
2625 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2626 const void *frame, size_t frame_len,
2627 const struct ieee80211_tx_info *frame_txctl,
2628 struct ieee80211_rts *rts)
2630 const struct ieee80211_hdr *hdr = frame;
2632 rts->frame_control =
2633 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2634 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2636 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2637 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2639 EXPORT_SYMBOL(ieee80211_rts_get);
2641 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2642 const void *frame, size_t frame_len,
2643 const struct ieee80211_tx_info *frame_txctl,
2644 struct ieee80211_cts *cts)
2646 const struct ieee80211_hdr *hdr = frame;
2648 cts->frame_control =
2649 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2650 cts->duration = ieee80211_ctstoself_duration(hw, vif,
2651 frame_len, frame_txctl);
2652 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2654 EXPORT_SYMBOL(ieee80211_ctstoself_get);
2657 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2658 struct ieee80211_vif *vif)
2660 struct ieee80211_local *local = hw_to_local(hw);
2661 struct sk_buff *skb = NULL;
2662 struct ieee80211_tx_data tx;
2663 struct ieee80211_sub_if_data *sdata;
2665 struct ieee80211_tx_info *info;
2666 struct ieee80211_chanctx_conf *chanctx_conf;
2668 sdata = vif_to_sdata(vif);
2671 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2676 if (sdata->vif.type == NL80211_IFTYPE_AP) {
2677 struct beacon_data *beacon =
2678 rcu_dereference(sdata->u.ap.beacon);
2680 if (!beacon || !beacon->head)
2683 ps = &sdata->u.ap.ps;
2684 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2685 ps = &sdata->u.mesh.ps;
2690 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
2691 goto out; /* send buffered bc/mc only after DTIM beacon */
2694 skb = skb_dequeue(&ps->bc_buf);
2697 local->total_ps_buffered--;
2699 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
2700 struct ieee80211_hdr *hdr =
2701 (struct ieee80211_hdr *) skb->data;
2702 /* more buffered multicast/broadcast frames ==> set
2703 * MoreData flag in IEEE 802.11 header to inform PS
2705 hdr->frame_control |=
2706 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2709 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2710 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
2711 if (!ieee80211_tx_prepare(sdata, &tx, skb))
2713 dev_kfree_skb_any(skb);
2716 info = IEEE80211_SKB_CB(skb);
2718 tx.flags |= IEEE80211_TX_PS_BUFFERED;
2719 info->band = chanctx_conf->def.chan->band;
2721 if (invoke_tx_handlers(&tx))
2728 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2730 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
2731 struct sk_buff *skb, int tid,
2732 enum ieee80211_band band)
2734 int ac = ieee802_1d_to_ac[tid & 7];
2736 skb_set_mac_header(skb, 0);
2737 skb_set_network_header(skb, 0);
2738 skb_set_transport_header(skb, 0);
2740 skb_set_queue_mapping(skb, ac);
2741 skb->priority = tid;
2743 skb->dev = sdata->dev;
2746 * The other path calling ieee80211_xmit is from the tasklet,
2747 * and while we can handle concurrent transmissions locking
2748 * requirements are that we do not come into tx with bhs on.
2751 ieee80211_xmit(sdata, skb, band);