1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2005-2006, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Copyright (C) 2018 Intel Corporation
10 * Transmit and frame generation functions.
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/skbuff.h>
16 #include <linux/if_vlan.h>
17 #include <linux/etherdevice.h>
18 #include <linux/bitmap.h>
19 #include <linux/rcupdate.h>
20 #include <linux/export.h>
21 #include <net/net_namespace.h>
22 #include <net/ieee80211_radiotap.h>
23 #include <net/cfg80211.h>
24 #include <net/mac80211.h>
25 #include <net/codel.h>
26 #include <net/codel_impl.h>
27 #include <asm/unaligned.h>
28 #include <net/fq_impl.h>
30 #include "ieee80211_i.h"
31 #include "driver-ops.h"
41 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len)
43 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);
45 u64_stats_update_begin(&tstats->syncp);
47 tstats->tx_bytes += len;
48 u64_stats_update_end(&tstats->syncp);
51 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
52 struct sk_buff *skb, int group_addr,
55 int rate, mrate, erp, dur, i, shift = 0;
56 struct ieee80211_rate *txrate;
57 struct ieee80211_local *local = tx->local;
58 struct ieee80211_supported_band *sband;
59 struct ieee80211_hdr *hdr;
60 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
61 struct ieee80211_chanctx_conf *chanctx_conf;
64 /* assume HW handles this */
65 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
69 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
71 shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
72 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
77 if (WARN_ON_ONCE(tx->rate.idx < 0))
80 sband = local->hw.wiphy->bands[info->band];
81 txrate = &sband->bitrates[tx->rate.idx];
83 erp = txrate->flags & IEEE80211_RATE_ERP_G;
86 * data and mgmt (except PS Poll):
88 * - during contention period:
89 * if addr1 is group address: 0
90 * if more fragments = 0 and addr1 is individual address: time to
91 * transmit one ACK plus SIFS
92 * if more fragments = 1 and addr1 is individual address: time to
93 * transmit next fragment plus 2 x ACK plus 3 x SIFS
96 * - control response frame (CTS or ACK) shall be transmitted using the
97 * same rate as the immediately previous frame in the frame exchange
98 * sequence, if this rate belongs to the PHY mandatory rates, or else
99 * at the highest possible rate belonging to the PHY rates in the
102 hdr = (struct ieee80211_hdr *)skb->data;
103 if (ieee80211_is_ctl(hdr->frame_control)) {
104 /* TODO: These control frames are not currently sent by
105 * mac80211, but should they be implemented, this function
106 * needs to be updated to support duration field calculation.
108 * RTS: time needed to transmit pending data/mgmt frame plus
109 * one CTS frame plus one ACK frame plus 3 x SIFS
110 * CTS: duration of immediately previous RTS minus time
111 * required to transmit CTS and its SIFS
112 * ACK: 0 if immediately previous directed data/mgmt had
113 * more=0, with more=1 duration in ACK frame is duration
114 * from previous frame minus time needed to transmit ACK
116 * PS Poll: BIT(15) | BIT(14) | aid
122 if (0 /* FIX: data/mgmt during CFP */)
123 return cpu_to_le16(32768);
125 if (group_addr) /* Group address as the destination - no ACK */
128 /* Individual destination address:
129 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
130 * CTS and ACK frames shall be transmitted using the highest rate in
131 * basic rate set that is less than or equal to the rate of the
132 * immediately previous frame and that is using the same modulation
133 * (CCK or OFDM). If no basic rate set matches with these requirements,
134 * the highest mandatory rate of the PHY that is less than or equal to
135 * the rate of the previous frame is used.
136 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
139 /* use lowest available if everything fails */
140 mrate = sband->bitrates[0].bitrate;
141 for (i = 0; i < sband->n_bitrates; i++) {
142 struct ieee80211_rate *r = &sband->bitrates[i];
144 if (r->bitrate > txrate->bitrate)
147 if ((rate_flags & r->flags) != rate_flags)
150 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
151 rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
153 switch (sband->band) {
154 case NL80211_BAND_2GHZ: {
156 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
157 flag = IEEE80211_RATE_MANDATORY_G;
159 flag = IEEE80211_RATE_MANDATORY_B;
164 case NL80211_BAND_5GHZ:
165 if (r->flags & IEEE80211_RATE_MANDATORY_A)
168 case NL80211_BAND_60GHZ:
169 /* TODO, for now fall through */
170 case NUM_NL80211_BANDS:
176 /* No matching basic rate found; use highest suitable mandatory
178 rate = DIV_ROUND_UP(mrate, 1 << shift);
181 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
182 if (ieee80211_is_data_qos(hdr->frame_control) &&
183 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
186 /* Time needed to transmit ACK
187 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
188 * to closest integer */
189 dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
190 tx->sdata->vif.bss_conf.use_short_preamble,
194 /* Frame is fragmented: duration increases with time needed to
195 * transmit next fragment plus ACK and 2 x SIFS. */
196 dur *= 2; /* ACK + SIFS */
198 dur += ieee80211_frame_duration(sband->band, next_frag_len,
199 txrate->bitrate, erp,
200 tx->sdata->vif.bss_conf.use_short_preamble,
204 return cpu_to_le16(dur);
208 static ieee80211_tx_result debug_noinline
209 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
211 struct ieee80211_local *local = tx->local;
212 struct ieee80211_if_managed *ifmgd;
213 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
215 /* driver doesn't support power save */
216 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
219 /* hardware does dynamic power save */
220 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
223 /* dynamic power save disabled */
224 if (local->hw.conf.dynamic_ps_timeout <= 0)
227 /* we are scanning, don't enable power save */
231 if (!local->ps_sdata)
234 /* No point if we're going to suspend */
235 if (local->quiescing)
238 /* dynamic ps is supported only in managed mode */
239 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
242 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK))
245 ifmgd = &tx->sdata->u.mgd;
248 * Don't wakeup from power save if u-apsd is enabled, voip ac has
249 * u-apsd enabled and the frame is in voip class. This effectively
250 * means that even if all access categories have u-apsd enabled, in
251 * practise u-apsd is only used with the voip ac. This is a
252 * workaround for the case when received voip class packets do not
253 * have correct qos tag for some reason, due the network or the
256 * Note: ifmgd->uapsd_queues access is racy here. If the value is
257 * changed via debugfs, user needs to reassociate manually to have
258 * everything in sync.
260 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
261 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
262 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
265 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
266 ieee80211_stop_queues_by_reason(&local->hw,
267 IEEE80211_MAX_QUEUE_MAP,
268 IEEE80211_QUEUE_STOP_REASON_PS,
270 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
271 ieee80211_queue_work(&local->hw,
272 &local->dynamic_ps_disable_work);
275 /* Don't restart the timer if we're not disassociated */
276 if (!ifmgd->associated)
279 mod_timer(&local->dynamic_ps_timer, jiffies +
280 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
285 static ieee80211_tx_result debug_noinline
286 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
289 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
290 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
293 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
296 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
297 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
298 !ieee80211_is_probe_req(hdr->frame_control) &&
299 !ieee80211_is_nullfunc(hdr->frame_control))
301 * When software scanning only nullfunc frames (to notify
302 * the sleep state to the AP) and probe requests (for the
303 * active scan) are allowed, all other frames should not be
304 * sent and we should not get here, but if we do
305 * nonetheless, drop them to avoid sending them
306 * off-channel. See the link below and
307 * ieee80211_start_scan() for more.
309 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
313 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
316 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
319 if (tx->flags & IEEE80211_TX_PS_BUFFERED)
323 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
325 if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
326 if (unlikely(!assoc &&
327 ieee80211_is_data(hdr->frame_control))) {
328 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
329 sdata_info(tx->sdata,
330 "dropped data frame to not associated station %pM\n",
333 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
336 } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
337 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
339 * No associated STAs - no need to send multicast
348 /* This function is called whenever the AP is about to exceed the maximum limit
349 * of buffered frames for power saving STAs. This situation should not really
350 * happen often during normal operation, so dropping the oldest buffered packet
351 * from each queue should be OK to make some room for new frames. */
352 static void purge_old_ps_buffers(struct ieee80211_local *local)
354 int total = 0, purged = 0;
356 struct ieee80211_sub_if_data *sdata;
357 struct sta_info *sta;
359 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
362 if (sdata->vif.type == NL80211_IFTYPE_AP)
363 ps = &sdata->u.ap.ps;
364 else if (ieee80211_vif_is_mesh(&sdata->vif))
365 ps = &sdata->u.mesh.ps;
369 skb = skb_dequeue(&ps->bc_buf);
372 ieee80211_free_txskb(&local->hw, skb);
374 total += skb_queue_len(&ps->bc_buf);
378 * Drop one frame from each station from the lowest-priority
379 * AC that has frames at all.
381 list_for_each_entry_rcu(sta, &local->sta_list, list) {
384 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
385 skb = skb_dequeue(&sta->ps_tx_buf[ac]);
386 total += skb_queue_len(&sta->ps_tx_buf[ac]);
389 ieee80211_free_txskb(&local->hw, skb);
395 local->total_ps_buffered = total;
396 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
399 static ieee80211_tx_result
400 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
402 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
403 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
407 * broadcast/multicast frame
409 * If any of the associated/peer stations is in power save mode,
410 * the frame is buffered to be sent after DTIM beacon frame.
411 * This is done either by the hardware or us.
414 /* powersaving STAs currently only in AP/VLAN/mesh mode */
415 if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
416 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
420 ps = &tx->sdata->bss->ps;
421 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
422 ps = &tx->sdata->u.mesh.ps;
428 /* no buffering for ordered frames */
429 if (ieee80211_has_order(hdr->frame_control))
432 if (ieee80211_is_probe_req(hdr->frame_control))
435 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
436 info->hw_queue = tx->sdata->vif.cab_queue;
438 /* no stations in PS mode and no buffered packets */
439 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
442 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
444 /* device releases frame after DTIM beacon */
445 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
448 /* buffered in mac80211 */
449 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
450 purge_old_ps_buffers(tx->local);
452 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
454 "BC TX buffer full - dropping the oldest frame\n");
455 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
457 tx->local->total_ps_buffered++;
459 skb_queue_tail(&ps->bc_buf, tx->skb);
464 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
467 if (!ieee80211_is_mgmt(fc))
470 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
473 if (!ieee80211_is_robust_mgmt_frame(skb))
479 static ieee80211_tx_result
480 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
482 struct sta_info *sta = tx->sta;
483 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
484 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
485 struct ieee80211_local *local = tx->local;
490 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
491 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
492 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
493 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
494 int ac = skb_get_queue_mapping(tx->skb);
496 if (ieee80211_is_mgmt(hdr->frame_control) &&
497 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
498 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
502 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
503 sta->sta.addr, sta->sta.aid, ac);
504 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
505 purge_old_ps_buffers(tx->local);
507 /* sync with ieee80211_sta_ps_deliver_wakeup */
508 spin_lock(&sta->ps_lock);
510 * STA woke up the meantime and all the frames on ps_tx_buf have
511 * been queued to pending queue. No reordering can happen, go
512 * ahead and Tx the packet.
514 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
515 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
516 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
517 spin_unlock(&sta->ps_lock);
521 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
522 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
524 "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
526 ieee80211_free_txskb(&local->hw, old);
528 tx->local->total_ps_buffered++;
530 info->control.jiffies = jiffies;
531 info->control.vif = &tx->sdata->vif;
532 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
533 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
534 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
535 spin_unlock(&sta->ps_lock);
537 if (!timer_pending(&local->sta_cleanup))
538 mod_timer(&local->sta_cleanup,
539 round_jiffies(jiffies +
540 STA_INFO_CLEANUP_INTERVAL));
543 * We queued up some frames, so the TIM bit might
544 * need to be set, recalculate it.
546 sta_info_recalc_tim(sta);
549 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
551 "STA %pM in PS mode, but polling/in SP -> send frame\n",
558 static ieee80211_tx_result debug_noinline
559 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
561 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
564 if (tx->flags & IEEE80211_TX_UNICAST)
565 return ieee80211_tx_h_unicast_ps_buf(tx);
567 return ieee80211_tx_h_multicast_ps_buf(tx);
570 static ieee80211_tx_result debug_noinline
571 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
573 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
575 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
576 if (tx->sdata->control_port_no_encrypt)
577 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
578 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
579 info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
585 static ieee80211_tx_result debug_noinline
586 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
588 struct ieee80211_key *key;
589 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
590 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
592 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
595 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
597 else if (ieee80211_is_group_privacy_action(tx->skb) &&
598 (key = rcu_dereference(tx->sdata->default_multicast_key)))
600 else if (ieee80211_is_mgmt(hdr->frame_control) &&
601 is_multicast_ether_addr(hdr->addr1) &&
602 ieee80211_is_robust_mgmt_frame(tx->skb) &&
603 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
605 else if (is_multicast_ether_addr(hdr->addr1) &&
606 (key = rcu_dereference(tx->sdata->default_multicast_key)))
608 else if (!is_multicast_ether_addr(hdr->addr1) &&
609 (key = rcu_dereference(tx->sdata->default_unicast_key)))
615 bool skip_hw = false;
617 /* TODO: add threshold stuff again */
619 switch (tx->key->conf.cipher) {
620 case WLAN_CIPHER_SUITE_WEP40:
621 case WLAN_CIPHER_SUITE_WEP104:
622 case WLAN_CIPHER_SUITE_TKIP:
623 if (!ieee80211_is_data_present(hdr->frame_control))
626 case WLAN_CIPHER_SUITE_CCMP:
627 case WLAN_CIPHER_SUITE_CCMP_256:
628 case WLAN_CIPHER_SUITE_GCMP:
629 case WLAN_CIPHER_SUITE_GCMP_256:
630 if (!ieee80211_is_data_present(hdr->frame_control) &&
631 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
633 !ieee80211_is_group_privacy_action(tx->skb))
636 skip_hw = (tx->key->conf.flags &
637 IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
638 ieee80211_is_mgmt(hdr->frame_control);
640 case WLAN_CIPHER_SUITE_AES_CMAC:
641 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
642 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
643 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
644 if (!ieee80211_is_mgmt(hdr->frame_control))
649 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
650 !ieee80211_is_deauth(hdr->frame_control)))
653 if (!skip_hw && tx->key &&
654 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
655 info->control.hw_key = &tx->key->conf;
661 static ieee80211_tx_result debug_noinline
662 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
665 struct ieee80211_hdr *hdr = (void *)tx->skb->data;
666 struct ieee80211_supported_band *sband;
668 struct ieee80211_tx_rate_control txrc;
669 struct ieee80211_sta_rates *ratetbl = NULL;
672 memset(&txrc, 0, sizeof(txrc));
674 sband = tx->local->hw.wiphy->bands[info->band];
676 len = min_t(u32, tx->skb->len + FCS_LEN,
677 tx->local->hw.wiphy->frag_threshold);
679 /* set up the tx rate control struct we give the RC algo */
680 txrc.hw = &tx->local->hw;
682 txrc.bss_conf = &tx->sdata->vif.bss_conf;
684 txrc.reported_rate.idx = -1;
685 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
687 if (tx->sdata->rc_has_mcs_mask[info->band])
688 txrc.rate_idx_mcs_mask =
689 tx->sdata->rc_rateidx_mcs_mask[info->band];
691 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
692 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
693 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
694 tx->sdata->vif.type == NL80211_IFTYPE_OCB);
696 /* set up RTS protection if desired */
697 if (len > tx->local->hw.wiphy->rts_threshold) {
701 info->control.use_rts = txrc.rts;
702 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
705 * Use short preamble if the BSS can handle it, but not for
706 * management frames unless we know the receiver can handle
707 * that -- the management frame might be to a station that
708 * just wants a probe response.
710 if (tx->sdata->vif.bss_conf.use_short_preamble &&
711 (ieee80211_is_data(hdr->frame_control) ||
712 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
713 txrc.short_preamble = true;
715 info->control.short_preamble = txrc.short_preamble;
717 /* don't ask rate control when rate already injected via radiotap */
718 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
722 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
725 * Lets not bother rate control if we're associated and cannot
726 * talk to the sta. This should not happen.
728 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
729 !rate_usable_index_exists(sband, &tx->sta->sta),
730 "%s: Dropped data frame as no usable bitrate found while "
731 "scanning and associated. Target station: "
732 "%pM on %d GHz band\n",
733 tx->sdata->name, hdr->addr1,
738 * If we're associated with the sta at this point we know we can at
739 * least send the frame at the lowest bit rate.
741 rate_control_get_rate(tx->sdata, tx->sta, &txrc);
743 if (tx->sta && !info->control.skip_table)
744 ratetbl = rcu_dereference(tx->sta->sta.rates);
746 if (unlikely(info->control.rates[0].idx < 0)) {
748 struct ieee80211_tx_rate rate = {
749 .idx = ratetbl->rate[0].idx,
750 .flags = ratetbl->rate[0].flags,
751 .count = ratetbl->rate[0].count
754 if (ratetbl->rate[0].idx < 0)
762 tx->rate = info->control.rates[0];
765 if (txrc.reported_rate.idx < 0) {
766 txrc.reported_rate = tx->rate;
767 if (tx->sta && ieee80211_is_data(hdr->frame_control))
768 tx->sta->tx_stats.last_rate = txrc.reported_rate;
770 tx->sta->tx_stats.last_rate = txrc.reported_rate;
775 if (unlikely(!info->control.rates[0].count))
776 info->control.rates[0].count = 1;
778 if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
779 (info->flags & IEEE80211_TX_CTL_NO_ACK)))
780 info->control.rates[0].count = 1;
785 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
787 u16 *seq = &sta->tid_seq[tid];
788 __le16 ret = cpu_to_le16(*seq);
790 /* Increase the sequence number. */
791 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
796 static ieee80211_tx_result debug_noinline
797 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
799 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
800 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
804 * Packet injection may want to control the sequence
805 * number, if we have no matching interface then we
806 * neither assign one ourselves nor ask the driver to.
808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
811 if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
814 if (ieee80211_hdrlen(hdr->frame_control) < 24)
817 if (ieee80211_is_qos_nullfunc(hdr->frame_control))
821 * Anything but QoS data that has a sequence number field
822 * (is long enough) gets a sequence number from the global
823 * counter. QoS data frames with a multicast destination
824 * also use the global counter (802.11-2012 9.3.2.10).
826 if (!ieee80211_is_data_qos(hdr->frame_control) ||
827 is_multicast_ether_addr(hdr->addr1)) {
828 if (tx->flags & IEEE80211_TX_NO_SEQNO)
830 /* driver should assign sequence number */
831 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
832 /* for pure STA mode without beacons, we can do it */
833 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
834 tx->sdata->sequence_number += 0x10;
836 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++;
841 * This should be true for injected/management frames only, for
842 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
843 * above since they are not QoS-data frames.
848 /* include per-STA, per-TID sequence counter */
849 tid = ieee80211_get_tid(hdr);
850 tx->sta->tx_stats.msdu[tid]++;
852 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
857 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
858 struct sk_buff *skb, int hdrlen,
861 struct ieee80211_local *local = tx->local;
862 struct ieee80211_tx_info *info;
864 int per_fragm = frag_threshold - hdrlen - FCS_LEN;
865 int pos = hdrlen + per_fragm;
866 int rem = skb->len - hdrlen - per_fragm;
868 if (WARN_ON(rem < 0))
871 /* first fragment was already added to queue by caller */
874 int fraglen = per_fragm;
879 tmp = dev_alloc_skb(local->tx_headroom +
881 tx->sdata->encrypt_headroom +
882 IEEE80211_ENCRYPT_TAILROOM);
886 __skb_queue_tail(&tx->skbs, tmp);
889 local->tx_headroom + tx->sdata->encrypt_headroom);
891 /* copy control information */
892 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
894 info = IEEE80211_SKB_CB(tmp);
895 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
896 IEEE80211_TX_CTL_FIRST_FRAGMENT);
899 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
901 skb_copy_queue_mapping(tmp, skb);
902 tmp->priority = skb->priority;
905 /* copy header and data */
906 skb_put_data(tmp, skb->data, hdrlen);
907 skb_put_data(tmp, skb->data + pos, fraglen);
912 /* adjust first fragment's length */
913 skb_trim(skb, hdrlen + per_fragm);
917 static ieee80211_tx_result debug_noinline
918 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
920 struct sk_buff *skb = tx->skb;
921 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
922 struct ieee80211_hdr *hdr = (void *)skb->data;
923 int frag_threshold = tx->local->hw.wiphy->frag_threshold;
927 /* no matter what happens, tx->skb moves to tx->skbs */
928 __skb_queue_tail(&tx->skbs, skb);
931 if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
934 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
938 * Warn when submitting a fragmented A-MPDU frame and drop it.
939 * This scenario is handled in ieee80211_tx_prepare but extra
940 * caution taken here as fragmented ampdu may cause Tx stop.
942 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
945 hdrlen = ieee80211_hdrlen(hdr->frame_control);
947 /* internal error, why isn't DONTFRAG set? */
948 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
952 * Now fragment the frame. This will allocate all the fragments and
953 * chain them (using skb as the first fragment) to skb->next.
954 * During transmission, we will remove the successfully transmitted
955 * fragments from this list. When the low-level driver rejects one
956 * of the fragments then we will simply pretend to accept the skb
957 * but store it away as pending.
959 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
962 /* update duration/seq/flags of fragments */
965 skb_queue_walk(&tx->skbs, skb) {
966 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
968 hdr = (void *)skb->data;
969 info = IEEE80211_SKB_CB(skb);
971 if (!skb_queue_is_last(&tx->skbs, skb)) {
972 hdr->frame_control |= morefrags;
974 * No multi-rate retries for fragmented frames, that
975 * would completely throw off the NAV at other STAs.
977 info->control.rates[1].idx = -1;
978 info->control.rates[2].idx = -1;
979 info->control.rates[3].idx = -1;
980 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
981 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
983 hdr->frame_control &= ~morefrags;
985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
992 static ieee80211_tx_result debug_noinline
993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
1001 skb_queue_walk(&tx->skbs, skb) {
1002 ac = skb_get_queue_mapping(skb);
1003 tx->sta->tx_stats.bytes[ac] += skb->len;
1006 tx->sta->tx_stats.packets[ac]++;
1011 static ieee80211_tx_result debug_noinline
1012 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1017 switch (tx->key->conf.cipher) {
1018 case WLAN_CIPHER_SUITE_WEP40:
1019 case WLAN_CIPHER_SUITE_WEP104:
1020 return ieee80211_crypto_wep_encrypt(tx);
1021 case WLAN_CIPHER_SUITE_TKIP:
1022 return ieee80211_crypto_tkip_encrypt(tx);
1023 case WLAN_CIPHER_SUITE_CCMP:
1024 return ieee80211_crypto_ccmp_encrypt(
1025 tx, IEEE80211_CCMP_MIC_LEN);
1026 case WLAN_CIPHER_SUITE_CCMP_256:
1027 return ieee80211_crypto_ccmp_encrypt(
1028 tx, IEEE80211_CCMP_256_MIC_LEN);
1029 case WLAN_CIPHER_SUITE_AES_CMAC:
1030 return ieee80211_crypto_aes_cmac_encrypt(tx);
1031 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
1032 return ieee80211_crypto_aes_cmac_256_encrypt(tx);
1033 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
1034 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
1035 return ieee80211_crypto_aes_gmac_encrypt(tx);
1036 case WLAN_CIPHER_SUITE_GCMP:
1037 case WLAN_CIPHER_SUITE_GCMP_256:
1038 return ieee80211_crypto_gcmp_encrypt(tx);
1040 return ieee80211_crypto_hw_encrypt(tx);
1046 static ieee80211_tx_result debug_noinline
1047 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1049 struct sk_buff *skb;
1050 struct ieee80211_hdr *hdr;
1054 skb_queue_walk(&tx->skbs, skb) {
1055 hdr = (void *) skb->data;
1056 if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1057 break; /* must not overwrite AID */
1058 if (!skb_queue_is_last(&tx->skbs, skb)) {
1059 struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1060 next_len = next->len;
1063 group_addr = is_multicast_ether_addr(hdr->addr1);
1066 ieee80211_duration(tx, skb, group_addr, next_len);
1072 /* actual transmit path */
1074 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1075 struct sk_buff *skb,
1076 struct ieee80211_tx_info *info,
1077 struct tid_ampdu_tx *tid_tx,
1080 bool queued = false;
1081 bool reset_agg_timer = false;
1082 struct sk_buff *purge_skb = NULL;
1084 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1085 info->flags |= IEEE80211_TX_CTL_AMPDU;
1086 reset_agg_timer = true;
1087 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1089 * nothing -- this aggregation session is being started
1090 * but that might still fail with the driver
1092 } else if (!tx->sta->sta.txq[tid]) {
1093 spin_lock(&tx->sta->lock);
1095 * Need to re-check now, because we may get here
1097 * 1) in the window during which the setup is actually
1098 * already done, but not marked yet because not all
1099 * packets are spliced over to the driver pending
1100 * queue yet -- if this happened we acquire the lock
1101 * either before or after the splice happens, but
1102 * need to recheck which of these cases happened.
1104 * 2) during session teardown, if the OPERATIONAL bit
1105 * was cleared due to the teardown but the pointer
1106 * hasn't been assigned NULL yet (or we loaded it
1107 * before it was assigned) -- in this case it may
1108 * now be NULL which means we should just let the
1109 * packet pass through because splicing the frames
1110 * back is already done.
1112 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1115 /* do nothing, let packet pass through */
1116 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1117 info->flags |= IEEE80211_TX_CTL_AMPDU;
1118 reset_agg_timer = true;
1121 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
1122 clear_sta_flag(tx->sta, WLAN_STA_SP);
1123 ps_dbg(tx->sta->sdata,
1124 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
1125 tx->sta->sta.addr, tx->sta->sta.aid);
1127 info->control.vif = &tx->sdata->vif;
1128 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1129 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
1130 __skb_queue_tail(&tid_tx->pending, skb);
1131 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1132 purge_skb = __skb_dequeue(&tid_tx->pending);
1134 spin_unlock(&tx->sta->lock);
1137 ieee80211_free_txskb(&tx->local->hw, purge_skb);
1140 /* reset session timer */
1141 if (reset_agg_timer)
1142 tid_tx->last_tx = jiffies;
1149 * pass %NULL for the station if unknown, a valid pointer if known
1150 * or an ERR_PTR() if the station is known not to exist
1152 static ieee80211_tx_result
1153 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1154 struct ieee80211_tx_data *tx,
1155 struct sta_info *sta, struct sk_buff *skb)
1157 struct ieee80211_local *local = sdata->local;
1158 struct ieee80211_hdr *hdr;
1159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1162 memset(tx, 0, sizeof(*tx));
1166 __skb_queue_head_init(&tx->skbs);
1169 * If this flag is set to true anywhere, and we get here,
1170 * we are doing the needed processing, so remove the flag
1173 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1175 hdr = (struct ieee80211_hdr *) skb->data;
1181 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1182 tx->sta = rcu_dereference(sdata->u.vlan.sta);
1183 if (!tx->sta && sdata->wdev.use_4addr)
1185 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
1186 IEEE80211_TX_CTL_INJECTED) ||
1187 tx->sdata->control_port_protocol == tx->skb->protocol) {
1188 tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1190 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
1191 tx->sta = sta_info_get(sdata, hdr->addr1);
1194 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1195 !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1196 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
1197 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
1198 struct tid_ampdu_tx *tid_tx;
1200 tid = ieee80211_get_tid(hdr);
1202 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1206 queued = ieee80211_tx_prep_agg(tx, skb, info,
1209 if (unlikely(queued))
1214 if (is_multicast_ether_addr(hdr->addr1)) {
1215 tx->flags &= ~IEEE80211_TX_UNICAST;
1216 info->flags |= IEEE80211_TX_CTL_NO_ACK;
1218 tx->flags |= IEEE80211_TX_UNICAST;
1220 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1221 if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1222 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1223 info->flags & IEEE80211_TX_CTL_AMPDU)
1224 info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1228 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1229 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
1230 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1231 ieee80211_check_fast_xmit(tx->sta);
1234 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1239 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
1240 struct ieee80211_vif *vif,
1241 struct sta_info *sta,
1242 struct sk_buff *skb)
1244 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1245 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1246 struct ieee80211_txq *txq = NULL;
1248 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
1249 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
1252 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
1253 if ((!ieee80211_is_mgmt(hdr->frame_control) ||
1254 ieee80211_is_bufferable_mmpdu(hdr->frame_control) ||
1255 vif->type == NL80211_IFTYPE_STATION) &&
1256 sta && sta->uploaded) {
1258 * This will be NULL if the driver didn't set the
1259 * opt-in hardware flag.
1261 txq = sta->sta.txq[IEEE80211_NUM_TIDS];
1264 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
1269 txq = sta->sta.txq[tid];
1277 return to_txq_info(txq);
1280 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
1282 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
1285 static u32 codel_skb_len_func(const struct sk_buff *skb)
1290 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
1292 const struct ieee80211_tx_info *info;
1294 info = (const struct ieee80211_tx_info *)skb->cb;
1295 return info->control.enqueue_time;
1298 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
1301 struct ieee80211_local *local;
1302 struct txq_info *txqi;
1304 struct fq_flow *flow;
1307 local = vif_to_sdata(txqi->txq.vif)->local;
1310 if (cvars == &txqi->def_cvars)
1311 flow = &txqi->def_flow;
1313 flow = &fq->flows[cvars - local->cvars];
1315 return fq_flow_dequeue(fq, flow);
1318 static void codel_drop_func(struct sk_buff *skb,
1321 struct ieee80211_local *local;
1322 struct ieee80211_hw *hw;
1323 struct txq_info *txqi;
1326 local = vif_to_sdata(txqi->txq.vif)->local;
1329 ieee80211_free_txskb(hw, skb);
1332 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
1334 struct fq_flow *flow)
1336 struct ieee80211_local *local;
1337 struct txq_info *txqi;
1338 struct codel_vars *cvars;
1339 struct codel_params *cparams;
1340 struct codel_stats *cstats;
1342 local = container_of(fq, struct ieee80211_local, fq);
1343 txqi = container_of(tin, struct txq_info, tin);
1344 cstats = &txqi->cstats;
1346 if (txqi->txq.sta) {
1347 struct sta_info *sta = container_of(txqi->txq.sta,
1348 struct sta_info, sta);
1349 cparams = &sta->cparams;
1351 cparams = &local->cparams;
1354 if (flow == &txqi->def_flow)
1355 cvars = &txqi->def_cvars;
1357 cvars = &local->cvars[flow - fq->flows];
1359 return codel_dequeue(txqi,
1365 codel_skb_time_func,
1367 codel_dequeue_func);
1370 static void fq_skb_free_func(struct fq *fq,
1372 struct fq_flow *flow,
1373 struct sk_buff *skb)
1375 struct ieee80211_local *local;
1377 local = container_of(fq, struct ieee80211_local, fq);
1378 ieee80211_free_txskb(&local->hw, skb);
1381 static struct fq_flow *fq_flow_get_default_func(struct fq *fq,
1384 struct sk_buff *skb)
1386 struct txq_info *txqi;
1388 txqi = container_of(tin, struct txq_info, tin);
1389 return &txqi->def_flow;
1392 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
1393 struct txq_info *txqi,
1394 struct sk_buff *skb)
1396 struct fq *fq = &local->fq;
1397 struct fq_tin *tin = &txqi->tin;
1398 u32 flow_idx = fq_flow_idx(fq, skb);
1400 ieee80211_set_skb_enqueue_time(skb);
1402 spin_lock_bh(&fq->lock);
1403 fq_tin_enqueue(fq, tin, flow_idx, skb,
1405 fq_flow_get_default_func);
1406 spin_unlock_bh(&fq->lock);
1409 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
1410 struct fq_flow *flow, struct sk_buff *skb,
1413 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1415 return info->control.vif == data;
1418 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
1419 struct ieee80211_sub_if_data *sdata)
1421 struct fq *fq = &local->fq;
1422 struct txq_info *txqi;
1424 struct ieee80211_sub_if_data *ap;
1426 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
1429 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1434 txqi = to_txq_info(ap->vif.txq);
1437 spin_lock_bh(&fq->lock);
1438 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
1440 spin_unlock_bh(&fq->lock);
1443 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
1444 struct sta_info *sta,
1445 struct txq_info *txqi, int tid)
1447 fq_tin_init(&txqi->tin);
1448 fq_flow_init(&txqi->def_flow);
1449 codel_vars_init(&txqi->def_cvars);
1450 codel_stats_init(&txqi->cstats);
1451 __skb_queue_head_init(&txqi->frags);
1452 INIT_LIST_HEAD(&txqi->schedule_order);
1454 txqi->txq.vif = &sdata->vif;
1457 sdata->vif.txq = &txqi->txq;
1459 txqi->txq.ac = IEEE80211_AC_BE;
1464 if (tid == IEEE80211_NUM_TIDS) {
1465 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1466 /* Drivers need to opt in to the management MPDU TXQ */
1467 if (!ieee80211_hw_check(&sdata->local->hw,
1470 } else if (!ieee80211_hw_check(&sdata->local->hw,
1472 /* Drivers need to opt in to the bufferable MMPDU TXQ */
1475 txqi->txq.ac = IEEE80211_AC_VO;
1477 txqi->txq.ac = ieee80211_ac_from_tid(tid);
1480 txqi->txq.sta = &sta->sta;
1481 txqi->txq.tid = tid;
1482 sta->sta.txq[tid] = &txqi->txq;
1485 void ieee80211_txq_purge(struct ieee80211_local *local,
1486 struct txq_info *txqi)
1488 struct fq *fq = &local->fq;
1489 struct fq_tin *tin = &txqi->tin;
1491 spin_lock_bh(&fq->lock);
1492 fq_tin_reset(fq, tin, fq_skb_free_func);
1493 ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
1494 spin_unlock_bh(&fq->lock);
1496 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]);
1497 list_del_init(&txqi->schedule_order);
1498 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]);
1501 void ieee80211_txq_set_params(struct ieee80211_local *local)
1503 if (local->hw.wiphy->txq_limit)
1504 local->fq.limit = local->hw.wiphy->txq_limit;
1506 local->hw.wiphy->txq_limit = local->fq.limit;
1508 if (local->hw.wiphy->txq_memory_limit)
1509 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
1511 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
1513 if (local->hw.wiphy->txq_quantum)
1514 local->fq.quantum = local->hw.wiphy->txq_quantum;
1516 local->hw.wiphy->txq_quantum = local->fq.quantum;
1519 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
1521 struct fq *fq = &local->fq;
1524 bool supp_vht = false;
1525 enum nl80211_band band;
1527 if (!local->ops->wake_tx_queue)
1530 ret = fq_init(fq, 4096);
1535 * If the hardware doesn't support VHT, it is safe to limit the maximum
1536 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
1538 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1539 struct ieee80211_supported_band *sband;
1541 sband = local->hw.wiphy->bands[band];
1545 supp_vht = supp_vht || sband->vht_cap.vht_supported;
1549 fq->memory_limit = 4 << 20; /* 4 Mbytes */
1551 codel_params_init(&local->cparams);
1552 local->cparams.interval = MS2TIME(100);
1553 local->cparams.target = MS2TIME(20);
1554 local->cparams.ecn = true;
1556 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
1558 if (!local->cvars) {
1559 spin_lock_bh(&fq->lock);
1560 fq_reset(fq, fq_skb_free_func);
1561 spin_unlock_bh(&fq->lock);
1565 for (i = 0; i < fq->flows_cnt; i++)
1566 codel_vars_init(&local->cvars[i]);
1568 ieee80211_txq_set_params(local);
1573 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
1575 struct fq *fq = &local->fq;
1577 if (!local->ops->wake_tx_queue)
1580 kfree(local->cvars);
1581 local->cvars = NULL;
1583 spin_lock_bh(&fq->lock);
1584 fq_reset(fq, fq_skb_free_func);
1585 spin_unlock_bh(&fq->lock);
1588 static bool ieee80211_queue_skb(struct ieee80211_local *local,
1589 struct ieee80211_sub_if_data *sdata,
1590 struct sta_info *sta,
1591 struct sk_buff *skb)
1593 struct ieee80211_vif *vif;
1594 struct txq_info *txqi;
1596 if (!local->ops->wake_tx_queue ||
1597 sdata->vif.type == NL80211_IFTYPE_MONITOR)
1600 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1601 sdata = container_of(sdata->bss,
1602 struct ieee80211_sub_if_data, u.ap);
1605 txqi = ieee80211_get_txq(local, vif, sta, skb);
1610 ieee80211_txq_enqueue(local, txqi, skb);
1612 schedule_and_wake_txq(local, txqi);
1617 static bool ieee80211_tx_frags(struct ieee80211_local *local,
1618 struct ieee80211_vif *vif,
1619 struct ieee80211_sta *sta,
1620 struct sk_buff_head *skbs,
1623 struct ieee80211_tx_control control = {};
1624 struct sk_buff *skb, *tmp;
1625 unsigned long flags;
1627 skb_queue_walk_safe(skbs, skb, tmp) {
1628 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1629 int q = info->hw_queue;
1631 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1632 if (WARN_ON_ONCE(q >= local->hw.queues)) {
1633 __skb_unlink(skb, skbs);
1634 ieee80211_free_txskb(&local->hw, skb);
1639 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1640 if (local->queue_stop_reasons[q] ||
1641 (!txpending && !skb_queue_empty(&local->pending[q]))) {
1642 if (unlikely(info->flags &
1643 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
1644 if (local->queue_stop_reasons[q] &
1645 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
1647 * Drop off-channel frames if queues
1648 * are stopped for any reason other
1649 * than off-channel operation. Never
1652 spin_unlock_irqrestore(
1653 &local->queue_stop_reason_lock,
1655 ieee80211_purge_tx_queue(&local->hw,
1662 * Since queue is stopped, queue up frames for
1663 * later transmission from the tx-pending
1664 * tasklet when the queue is woken again.
1667 skb_queue_splice_init(skbs,
1668 &local->pending[q]);
1670 skb_queue_splice_tail_init(skbs,
1671 &local->pending[q]);
1673 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1678 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1680 info->control.vif = vif;
1683 __skb_unlink(skb, skbs);
1684 drv_tx(local, &control, skb);
1691 * Returns false if the frame couldn't be transmitted but was queued instead.
1693 static bool __ieee80211_tx(struct ieee80211_local *local,
1694 struct sk_buff_head *skbs, int led_len,
1695 struct sta_info *sta, bool txpending)
1697 struct ieee80211_tx_info *info;
1698 struct ieee80211_sub_if_data *sdata;
1699 struct ieee80211_vif *vif;
1700 struct ieee80211_sta *pubsta;
1701 struct sk_buff *skb;
1705 if (WARN_ON(skb_queue_empty(skbs)))
1708 skb = skb_peek(skbs);
1709 fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1710 info = IEEE80211_SKB_CB(skb);
1711 sdata = vif_to_sdata(info->control.vif);
1712 if (sta && !sta->uploaded)
1720 switch (sdata->vif.type) {
1721 case NL80211_IFTYPE_MONITOR:
1722 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1726 sdata = rcu_dereference(local->monitor_sdata);
1730 vif->hw_queue[skb_get_queue_mapping(skb)];
1731 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
1732 ieee80211_purge_tx_queue(&local->hw, skbs);
1737 case NL80211_IFTYPE_AP_VLAN:
1738 sdata = container_of(sdata->bss,
1739 struct ieee80211_sub_if_data, u.ap);
1746 result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1749 ieee80211_tpt_led_trig_tx(local, fc, led_len);
1751 WARN_ON_ONCE(!skb_queue_empty(skbs));
1757 * Invoke TX handlers, return 0 on success and non-zero if the
1758 * frame was dropped or queued.
1760 * The handlers are split into an early and late part. The latter is everything
1761 * that can be sensitive to reordering, and will be deferred to after packets
1762 * are dequeued from the intermediate queues (when they are enabled).
1764 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
1766 ieee80211_tx_result res = TX_DROP;
1768 #define CALL_TXH(txh) \
1771 if (res != TX_CONTINUE) \
1775 CALL_TXH(ieee80211_tx_h_dynamic_ps);
1776 CALL_TXH(ieee80211_tx_h_check_assoc);
1777 CALL_TXH(ieee80211_tx_h_ps_buf);
1778 CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1779 CALL_TXH(ieee80211_tx_h_select_key);
1780 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1781 CALL_TXH(ieee80211_tx_h_rate_ctrl);
1784 if (unlikely(res == TX_DROP)) {
1785 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1787 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1789 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1791 } else if (unlikely(res == TX_QUEUED)) {
1792 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1800 * Late handlers can be called while the sta lock is held. Handlers that can
1801 * cause packets to be generated will cause deadlock!
1803 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
1805 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1806 ieee80211_tx_result res = TX_CONTINUE;
1808 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1809 __skb_queue_tail(&tx->skbs, tx->skb);
1814 CALL_TXH(ieee80211_tx_h_michael_mic_add);
1815 CALL_TXH(ieee80211_tx_h_sequence);
1816 CALL_TXH(ieee80211_tx_h_fragment);
1817 /* handlers after fragment must be aware of tx info fragmentation! */
1818 CALL_TXH(ieee80211_tx_h_stats);
1819 CALL_TXH(ieee80211_tx_h_encrypt);
1820 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
1821 CALL_TXH(ieee80211_tx_h_calculate_duration);
1825 if (unlikely(res == TX_DROP)) {
1826 I802_DEBUG_INC(tx->local->tx_handlers_drop);
1828 ieee80211_free_txskb(&tx->local->hw, tx->skb);
1830 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1832 } else if (unlikely(res == TX_QUEUED)) {
1833 I802_DEBUG_INC(tx->local->tx_handlers_queued);
1840 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1842 int r = invoke_tx_handlers_early(tx);
1846 return invoke_tx_handlers_late(tx);
1849 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
1850 struct ieee80211_vif *vif, struct sk_buff *skb,
1851 int band, struct ieee80211_sta **sta)
1853 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1854 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1855 struct ieee80211_tx_data tx;
1856 struct sk_buff *skb2;
1858 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
1862 info->control.vif = vif;
1863 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
1865 if (invoke_tx_handlers(&tx))
1870 *sta = &tx.sta->sta;
1875 /* this function isn't suitable for fragmented data frames */
1876 skb2 = __skb_dequeue(&tx.skbs);
1877 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
1878 ieee80211_free_txskb(hw, skb2);
1879 ieee80211_purge_tx_queue(hw, &tx.skbs);
1885 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
1888 * Returns false if the frame couldn't be transmitted but was queued instead.
1890 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1891 struct sta_info *sta, struct sk_buff *skb,
1892 bool txpending, u32 txdata_flags)
1894 struct ieee80211_local *local = sdata->local;
1895 struct ieee80211_tx_data tx;
1896 ieee80211_tx_result res_prepare;
1897 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1901 if (unlikely(skb->len < 10)) {
1906 /* initialises tx */
1908 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
1910 tx.flags |= txdata_flags;
1912 if (unlikely(res_prepare == TX_DROP)) {
1913 ieee80211_free_txskb(&local->hw, skb);
1915 } else if (unlikely(res_prepare == TX_QUEUED)) {
1919 /* set up hw_queue value early */
1920 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1921 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1923 sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1925 if (invoke_tx_handlers_early(&tx))
1928 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
1931 if (!invoke_tx_handlers_late(&tx))
1932 result = __ieee80211_tx(local, &tx.skbs, led_len,
1938 /* device xmit handlers */
1940 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1941 struct sk_buff *skb,
1942 int head_need, bool may_encrypt)
1944 struct ieee80211_local *local = sdata->local;
1945 struct ieee80211_hdr *hdr;
1949 hdr = (struct ieee80211_hdr *) skb->data;
1950 enc_tailroom = may_encrypt &&
1951 (sdata->crypto_tx_tailroom_needed_cnt ||
1952 ieee80211_is_mgmt(hdr->frame_control));
1955 tail_need = IEEE80211_ENCRYPT_TAILROOM;
1956 tail_need -= skb_tailroom(skb);
1957 tail_need = max_t(int, tail_need, 0);
1960 if (skb_cloned(skb) &&
1961 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
1962 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
1963 I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1964 else if (head_need || tail_need)
1965 I802_DEBUG_INC(local->tx_expand_skb_head);
1969 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1970 wiphy_debug(local->hw.wiphy,
1971 "failed to reallocate TX buffer\n");
1978 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
1979 struct sta_info *sta, struct sk_buff *skb,
1982 struct ieee80211_local *local = sdata->local;
1983 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1984 struct ieee80211_hdr *hdr;
1988 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1990 headroom = local->tx_headroom;
1992 headroom += sdata->encrypt_headroom;
1993 headroom -= skb_headroom(skb);
1994 headroom = max_t(int, 0, headroom);
1996 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1997 ieee80211_free_txskb(&local->hw, skb);
2001 hdr = (struct ieee80211_hdr *) skb->data;
2002 info->control.vif = &sdata->vif;
2004 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2005 if (ieee80211_is_data(hdr->frame_control) &&
2006 is_unicast_ether_addr(hdr->addr1)) {
2007 if (mesh_nexthop_resolve(sdata, skb))
2008 return; /* skb queued: don't free */
2010 ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
2014 ieee80211_set_qos_hdr(sdata, skb);
2015 ieee80211_tx(sdata, sta, skb, false, txdata_flags);
2018 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local,
2019 struct sk_buff *skb)
2021 struct ieee80211_radiotap_iterator iterator;
2022 struct ieee80211_radiotap_header *rthdr =
2023 (struct ieee80211_radiotap_header *) skb->data;
2024 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2025 struct ieee80211_supported_band *sband =
2026 local->hw.wiphy->bands[info->band];
2027 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
2031 bool rate_found = false;
2032 u8 rate_retries = 0;
2034 u8 mcs_known, mcs_flags, mcs_bw;
2036 u8 vht_mcs = 0, vht_nss = 0;
2039 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
2040 IEEE80211_TX_CTL_DONTFRAG;
2043 * for every radiotap entry that is present
2044 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
2045 * entries present, or -EINVAL on error)
2049 ret = ieee80211_radiotap_iterator_next(&iterator);
2054 /* see if this argument is something we can use */
2055 switch (iterator.this_arg_index) {
2057 * You must take care when dereferencing iterator.this_arg
2058 * for multibyte types... the pointer is not aligned. Use
2059 * get_unaligned((type *)iterator.this_arg) to dereference
2060 * iterator.this_arg for type "type" safely on all arches.
2062 case IEEE80211_RADIOTAP_FLAGS:
2063 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
2065 * this indicates that the skb we have been
2066 * handed has the 32-bit FCS CRC at the end...
2067 * we should react to that by snipping it off
2068 * because it will be recomputed and added
2071 if (skb->len < (iterator._max_length + FCS_LEN))
2074 skb_trim(skb, skb->len - FCS_LEN);
2076 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
2077 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
2078 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
2079 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
2082 case IEEE80211_RADIOTAP_TX_FLAGS:
2083 txflags = get_unaligned_le16(iterator.this_arg);
2084 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
2085 info->flags |= IEEE80211_TX_CTL_NO_ACK;
2088 case IEEE80211_RADIOTAP_RATE:
2089 rate = *iterator.this_arg;
2094 case IEEE80211_RADIOTAP_DATA_RETRIES:
2095 rate_retries = *iterator.this_arg;
2098 case IEEE80211_RADIOTAP_MCS:
2099 mcs_known = iterator.this_arg[0];
2100 mcs_flags = iterator.this_arg[1];
2101 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
2105 rate = iterator.this_arg[2];
2106 rate_flags = IEEE80211_TX_RC_MCS;
2108 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
2109 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
2110 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2112 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
2113 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
2114 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
2115 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2118 case IEEE80211_RADIOTAP_VHT:
2119 vht_known = get_unaligned_le16(iterator.this_arg);
2122 rate_flags = IEEE80211_TX_RC_VHT_MCS;
2123 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
2124 (iterator.this_arg[2] &
2125 IEEE80211_RADIOTAP_VHT_FLAG_SGI))
2126 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
2128 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
2129 if (iterator.this_arg[3] == 1)
2131 IEEE80211_TX_RC_40_MHZ_WIDTH;
2132 else if (iterator.this_arg[3] == 4)
2134 IEEE80211_TX_RC_80_MHZ_WIDTH;
2135 else if (iterator.this_arg[3] == 11)
2137 IEEE80211_TX_RC_160_MHZ_WIDTH;
2140 vht_mcs = iterator.this_arg[4] >> 4;
2141 vht_nss = iterator.this_arg[4] & 0xF;
2145 * Please update the file
2146 * Documentation/networking/mac80211-injection.txt
2147 * when parsing new fields here.
2155 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
2159 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
2161 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
2162 info->control.rates[i].idx = -1;
2163 info->control.rates[i].flags = 0;
2164 info->control.rates[i].count = 0;
2167 if (rate_flags & IEEE80211_TX_RC_MCS) {
2168 info->control.rates[0].idx = rate;
2169 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
2170 ieee80211_rate_set_vht(info->control.rates, vht_mcs,
2173 for (i = 0; i < sband->n_bitrates; i++) {
2174 if (rate * 5 != sband->bitrates[i].bitrate)
2177 info->control.rates[0].idx = i;
2182 if (info->control.rates[0].idx < 0)
2183 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
2185 info->control.rates[0].flags = rate_flags;
2186 info->control.rates[0].count = min_t(u8, rate_retries + 1,
2187 local->hw.max_rate_tries);
2191 * remove the radiotap header
2192 * iterator->_max_length was sanity-checked against
2193 * skb->len by iterator init
2195 skb_pull(skb, iterator._max_length);
2200 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
2201 struct net_device *dev)
2203 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2204 struct ieee80211_chanctx_conf *chanctx_conf;
2205 struct ieee80211_radiotap_header *prthdr =
2206 (struct ieee80211_radiotap_header *)skb->data;
2207 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2208 struct ieee80211_hdr *hdr;
2209 struct ieee80211_sub_if_data *tmp_sdata, *sdata;
2210 struct cfg80211_chan_def *chandef;
2214 /* check for not even having the fixed radiotap header part */
2215 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
2216 goto fail; /* too short to be possibly valid */
2218 /* is it a header version we can trust to find length from? */
2219 if (unlikely(prthdr->it_version))
2220 goto fail; /* only version 0 is supported */
2222 /* then there must be a radiotap header with a length we can use */
2223 len_rthdr = ieee80211_get_radiotap_len(skb->data);
2225 /* does the skb contain enough to deliver on the alleged length? */
2226 if (unlikely(skb->len < len_rthdr))
2227 goto fail; /* skb too short for claimed rt header extent */
2230 * fix up the pointers accounting for the radiotap
2231 * header still being in there. We are being given
2232 * a precooked IEEE80211 header so no need for
2235 skb_set_mac_header(skb, len_rthdr);
2237 * these are just fixed to the end of the rt area since we
2238 * don't have any better information and at this point, nobody cares
2240 skb_set_network_header(skb, len_rthdr);
2241 skb_set_transport_header(skb, len_rthdr);
2243 if (skb->len < len_rthdr + 2)
2246 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
2247 hdrlen = ieee80211_hdrlen(hdr->frame_control);
2249 if (skb->len < len_rthdr + hdrlen)
2253 * Initialize skb->protocol if the injected frame is a data frame
2254 * carrying a rfc1042 header
2256 if (ieee80211_is_data(hdr->frame_control) &&
2257 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
2258 u8 *payload = (u8 *)hdr + hdrlen;
2260 if (ether_addr_equal(payload, rfc1042_header))
2261 skb->protocol = cpu_to_be16((payload[6] << 8) |
2265 memset(info, 0, sizeof(*info));
2267 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
2268 IEEE80211_TX_CTL_INJECTED;
2273 * We process outgoing injected frames that have a local address
2274 * we handle as though they are non-injected frames.
2275 * This code here isn't entirely correct, the local MAC address
2276 * isn't always enough to find the interface to use; for proper
2277 * VLAN/WDS support we will need a different mechanism (which
2278 * likely isn't going to be monitor interfaces).
2280 sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2282 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
2283 if (!ieee80211_sdata_running(tmp_sdata))
2285 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
2286 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2287 tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
2289 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
2295 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2296 if (!chanctx_conf) {
2297 tmp_sdata = rcu_dereference(local->monitor_sdata);
2300 rcu_dereference(tmp_sdata->vif.chanctx_conf);
2304 chandef = &chanctx_conf->def;
2305 else if (!local->use_chanctx)
2306 chandef = &local->_oper_chandef;
2311 * Frame injection is not allowed if beaconing is not allowed
2312 * or if we need radar detection. Beaconing is usually not allowed when
2313 * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
2314 * Passive scan is also used in world regulatory domains where
2315 * your country is not known and as such it should be treated as
2316 * NO TX unless the channel is explicitly allowed in which case
2317 * your current regulatory domain would not have the passive scan
2320 * Since AP mode uses monitor interfaces to inject/TX management
2321 * frames we can make AP mode the exception to this rule once it
2322 * supports radar detection as its implementation can deal with
2323 * radar detection by itself. We can do that later by adding a
2324 * monitor flag interfaces used for AP support.
2326 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
2330 info->band = chandef->chan->band;
2332 /* process and remove the injection radiotap header */
2333 if (!ieee80211_parse_tx_radiotap(local, skb))
2336 ieee80211_xmit(sdata, NULL, skb, 0);
2339 return NETDEV_TX_OK;
2345 return NETDEV_TX_OK; /* meaning, we dealt with the skb */
2348 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
2350 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
2352 return ethertype == ETH_P_TDLS &&
2354 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
2357 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
2358 struct sk_buff *skb,
2359 struct sta_info **sta_out)
2361 struct sta_info *sta;
2363 switch (sdata->vif.type) {
2364 case NL80211_IFTYPE_AP_VLAN:
2365 sta = rcu_dereference(sdata->u.vlan.sta);
2369 } else if (sdata->wdev.use_4addr) {
2373 case NL80211_IFTYPE_AP:
2374 case NL80211_IFTYPE_OCB:
2375 case NL80211_IFTYPE_ADHOC:
2376 if (is_multicast_ether_addr(skb->data)) {
2377 *sta_out = ERR_PTR(-ENOENT);
2380 sta = sta_info_get_bss(sdata, skb->data);
2382 case NL80211_IFTYPE_WDS:
2383 sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
2385 #ifdef CONFIG_MAC80211_MESH
2386 case NL80211_IFTYPE_MESH_POINT:
2387 /* determined much later */
2391 case NL80211_IFTYPE_STATION:
2392 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
2393 sta = sta_info_get(sdata, skb->data);
2394 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2395 if (test_sta_flag(sta,
2396 WLAN_STA_TDLS_PEER_AUTH)) {
2402 * TDLS link during setup - throw out frames to
2403 * peer. Allow TDLS-setup frames to unauthorized
2404 * peers for the special case of a link teardown
2405 * after a TDLS sta is removed due to being
2408 if (!ieee80211_is_tdls_setup(skb))
2414 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
2422 *sta_out = sta ?: ERR_PTR(-ENOENT);
2427 * ieee80211_build_hdr - build 802.11 header in the given frame
2428 * @sdata: virtual interface to build the header for
2429 * @skb: the skb to build the header in
2430 * @info_flags: skb flags to set
2431 * @ctrl_flags: info control flags to set
2433 * This function takes the skb with 802.3 header and reformats the header to
2434 * the appropriate IEEE 802.11 header based on which interface the packet is
2435 * being transmitted on.
2437 * Note that this function also takes care of the TX status request and
2438 * potential unsharing of the SKB - this needs to be interleaved with the
2441 * The function requires the read-side RCU lock held
2443 * Returns: the (possibly reallocated) skb or an ERR_PTR() code
2445 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
2446 struct sk_buff *skb, u32 info_flags,
2447 struct sta_info *sta, u32 ctrl_flags)
2449 struct ieee80211_local *local = sdata->local;
2450 struct ieee80211_tx_info *info;
2452 u16 ethertype, hdrlen, meshhdrlen = 0;
2454 struct ieee80211_hdr hdr;
2455 struct ieee80211s_hdr mesh_hdr __maybe_unused;
2456 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
2457 const u8 *encaps_data;
2458 int encaps_len, skip_header_bytes;
2459 bool wme_sta = false, authorized = false;
2463 struct ieee80211_chanctx_conf *chanctx_conf;
2464 struct ieee80211_sub_if_data *ap_sdata;
2465 enum nl80211_band band;
2471 #ifdef CONFIG_MAC80211_DEBUGFS
2472 if (local->force_tx_status)
2473 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2476 /* convert Ethernet header to proper 802.11 header (based on
2477 * operation mode) */
2478 ethertype = (skb->data[12] << 8) | skb->data[13];
2479 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2481 switch (sdata->vif.type) {
2482 case NL80211_IFTYPE_AP_VLAN:
2483 if (sdata->wdev.use_4addr) {
2484 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2486 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
2487 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2488 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2489 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2491 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2492 wme_sta = sta->sta.wme;
2494 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
2496 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf);
2497 if (!chanctx_conf) {
2501 band = chanctx_conf->def.chan->band;
2502 if (sdata->wdev.use_4addr)
2505 case NL80211_IFTYPE_AP:
2506 if (sdata->vif.type == NL80211_IFTYPE_AP)
2507 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2508 if (!chanctx_conf) {
2512 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2514 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2515 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2516 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
2518 band = chanctx_conf->def.chan->band;
2520 case NL80211_IFTYPE_WDS:
2521 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
2523 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
2524 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2525 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2526 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2529 * This is the exception! WDS style interfaces are prohibited
2530 * when channel contexts are in used so this must be valid
2532 band = local->hw.conf.chandef.chan->band;
2534 #ifdef CONFIG_MAC80211_MESH
2535 case NL80211_IFTYPE_MESH_POINT:
2536 if (!is_multicast_ether_addr(skb->data)) {
2537 struct sta_info *next_hop;
2538 bool mpp_lookup = true;
2540 mpath = mesh_path_lookup(sdata, skb->data);
2543 next_hop = rcu_dereference(mpath->next_hop);
2545 !(mpath->flags & (MESH_PATH_ACTIVE |
2546 MESH_PATH_RESOLVING)))
2551 mppath = mpp_path_lookup(sdata, skb->data);
2553 mppath->exp_time = jiffies;
2556 if (mppath && mpath)
2557 mesh_path_del(sdata, mpath->dst);
2561 * Use address extension if it is a packet from
2562 * another interface or if we know the destination
2563 * is being proxied by a portal (i.e. portal address
2564 * differs from proxied address)
2566 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
2567 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
2568 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2569 skb->data, skb->data + ETH_ALEN);
2570 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
2573 /* DS -> MBSS (802.11-2012 13.11.3.3).
2574 * For unicast with unknown forwarding information,
2575 * destination might be in the MBSS or if that fails
2576 * forwarded to another mesh gate. In either case
2577 * resolution will be handled in ieee80211_xmit(), so
2578 * leave the original DA. This also works for mcast */
2579 const u8 *mesh_da = skb->data;
2582 mesh_da = mppath->mpp;
2584 mesh_da = mpath->dst;
2586 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
2587 mesh_da, sdata->vif.addr);
2588 if (is_multicast_ether_addr(mesh_da))
2589 /* DA TA mSA AE:SA */
2590 meshhdrlen = ieee80211_new_mesh_header(
2592 skb->data + ETH_ALEN, NULL);
2594 /* RA TA mDA mSA AE:DA SA */
2595 meshhdrlen = ieee80211_new_mesh_header(
2596 sdata, &mesh_hdr, skb->data,
2597 skb->data + ETH_ALEN);
2600 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2601 if (!chanctx_conf) {
2605 band = chanctx_conf->def.chan->band;
2607 /* For injected frames, fill RA right away as nexthop lookup
2610 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) &&
2611 is_zero_ether_addr(hdr.addr1))
2612 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2615 case NL80211_IFTYPE_STATION:
2616 /* we already did checks when looking up the RA STA */
2617 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
2621 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2622 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2623 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
2625 } else if (sdata->u.mgd.use_4addr &&
2626 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
2627 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2628 IEEE80211_FCTL_TODS);
2630 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2631 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
2632 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2633 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
2636 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2638 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
2639 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2640 memcpy(hdr.addr3, skb->data, ETH_ALEN);
2643 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2644 if (!chanctx_conf) {
2648 band = chanctx_conf->def.chan->band;
2650 case NL80211_IFTYPE_OCB:
2652 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2653 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2654 eth_broadcast_addr(hdr.addr3);
2656 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2657 if (!chanctx_conf) {
2661 band = chanctx_conf->def.chan->band;
2663 case NL80211_IFTYPE_ADHOC:
2665 memcpy(hdr.addr1, skb->data, ETH_ALEN);
2666 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
2667 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
2669 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2670 if (!chanctx_conf) {
2674 band = chanctx_conf->def.chan->band;
2681 multicast = is_multicast_ether_addr(hdr.addr1);
2683 /* sta is always NULL for mesh */
2685 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
2686 wme_sta = sta->sta.wme;
2687 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2688 /* For mesh, the use of the QoS header is mandatory */
2692 /* receiver does QoS (which also means we do) use it */
2694 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2699 * Drop unicast frames to unauthorised stations unless they are
2700 * EAPOL frames from the local station.
2702 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
2703 (sdata->vif.type != NL80211_IFTYPE_OCB) &&
2704 !multicast && !authorized &&
2705 (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
2706 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
2707 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2708 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
2709 sdata->name, hdr.addr1);
2712 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
2718 if (unlikely(!multicast && skb->sk &&
2719 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
2720 struct sk_buff *ack_skb = skb_clone_sk(skb);
2723 unsigned long flags;
2726 spin_lock_irqsave(&local->ack_status_lock, flags);
2727 id = idr_alloc(&local->ack_status_frames, ack_skb,
2728 1, 0x10000, GFP_ATOMIC);
2729 spin_unlock_irqrestore(&local->ack_status_lock, flags);
2733 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
2741 * If the skb is shared we need to obtain our own copy.
2743 if (skb_shared(skb)) {
2744 struct sk_buff *tmp_skb = skb;
2746 /* can't happen -- skb is a clone if info_id != 0 */
2749 skb = skb_clone(skb, GFP_ATOMIC);
2758 hdr.frame_control = fc;
2759 hdr.duration_id = 0;
2762 skip_header_bytes = ETH_HLEN;
2763 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2764 encaps_data = bridge_tunnel_header;
2765 encaps_len = sizeof(bridge_tunnel_header);
2766 skip_header_bytes -= 2;
2767 } else if (ethertype >= ETH_P_802_3_MIN) {
2768 encaps_data = rfc1042_header;
2769 encaps_len = sizeof(rfc1042_header);
2770 skip_header_bytes -= 2;
2776 skb_pull(skb, skip_header_bytes);
2777 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2780 * So we need to modify the skb header and hence need a copy of
2781 * that. The head_need variable above doesn't, so far, include
2782 * the needed header space that we don't need right away. If we
2783 * can, then we don't reallocate right now but only after the
2784 * frame arrives at the master device (if it does...)
2786 * If we cannot, however, then we will reallocate to include all
2787 * the ever needed space. Also, if we need to reallocate it anyway,
2788 * make it big enough for everything we may ever need.
2791 if (head_need > 0 || skb_cloned(skb)) {
2792 head_need += sdata->encrypt_headroom;
2793 head_need += local->tx_headroom;
2794 head_need = max_t(int, 0, head_need);
2795 if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2796 ieee80211_free_txskb(&local->hw, skb);
2798 return ERR_PTR(-ENOMEM);
2803 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2805 #ifdef CONFIG_MAC80211_MESH
2807 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2810 if (ieee80211_is_data_qos(fc)) {
2811 __le16 *qos_control;
2813 qos_control = skb_push(skb, 2);
2814 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2816 * Maybe we could actually set some fields here, for now just
2817 * initialise to zero to indicate no special operation.
2821 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2823 skb_reset_mac_header(skb);
2825 info = IEEE80211_SKB_CB(skb);
2826 memset(info, 0, sizeof(*info));
2828 info->flags = info_flags;
2829 info->ack_frame_id = info_id;
2831 info->control.flags = ctrl_flags;
2836 return ERR_PTR(ret);
2840 * fast-xmit overview
2842 * The core idea of this fast-xmit is to remove per-packet checks by checking
2843 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
2844 * checks that are needed to get the sta->fast_tx pointer assigned, after which
2845 * much less work can be done per packet. For example, fragmentation must be
2846 * disabled or the fast_tx pointer will not be set. All the conditions are seen
2849 * Once assigned, the fast_tx data structure also caches the per-packet 802.11
2850 * header and other data to aid packet processing in ieee80211_xmit_fast().
2852 * The most difficult part of this is that when any of these assumptions
2853 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
2854 * ieee80211_check_fast_xmit() or friends) is required to reset the data,
2855 * since the per-packet code no longer checks the conditions. This is reflected
2856 * by the calls to these functions throughout the rest of the code, and must be
2857 * maintained if any of the TX path checks change.
2860 void ieee80211_check_fast_xmit(struct sta_info *sta)
2862 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
2863 struct ieee80211_local *local = sta->local;
2864 struct ieee80211_sub_if_data *sdata = sta->sdata;
2865 struct ieee80211_hdr *hdr = (void *)build.hdr;
2866 struct ieee80211_chanctx_conf *chanctx_conf;
2869 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
2872 /* Locking here protects both the pointer itself, and against concurrent
2873 * invocations winning data access races to, e.g., the key pointer that
2875 * Without it, the invocation of this function right after the key
2876 * pointer changes wouldn't be sufficient, as another CPU could access
2877 * the pointer, then stall, and then do the cache update after the CPU
2878 * that invalidated the key.
2879 * With the locking, such scenarios cannot happen as the check for the
2880 * key and the fast-tx assignment are done atomically, so the CPU that
2881 * modifies the key will either wait or other one will see the key
2882 * cleared/changed already.
2884 spin_lock_bh(&sta->lock);
2885 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
2886 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
2887 sdata->vif.type == NL80211_IFTYPE_STATION)
2890 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2893 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
2894 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
2895 test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
2896 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
2899 if (sdata->noack_map)
2902 /* fast-xmit doesn't handle fragmentation at all */
2903 if (local->hw.wiphy->frag_threshold != (u32)-1 &&
2904 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
2908 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
2909 if (!chanctx_conf) {
2913 build.band = chanctx_conf->def.chan->band;
2916 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
2918 switch (sdata->vif.type) {
2919 case NL80211_IFTYPE_ADHOC:
2921 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2922 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2923 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
2926 case NL80211_IFTYPE_STATION:
2927 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
2929 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2930 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2931 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN);
2936 if (sdata->u.mgd.use_4addr) {
2937 /* non-regular ethertype cannot use the fastpath */
2938 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2939 IEEE80211_FCTL_TODS);
2941 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2942 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2943 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2944 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2948 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
2950 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN);
2951 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2952 build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
2955 case NL80211_IFTYPE_AP_VLAN:
2956 if (sdata->wdev.use_4addr) {
2957 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
2958 IEEE80211_FCTL_TODS);
2960 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
2961 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2962 build.da_offs = offsetof(struct ieee80211_hdr, addr3);
2963 build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
2968 case NL80211_IFTYPE_AP:
2969 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
2971 build.da_offs = offsetof(struct ieee80211_hdr, addr1);
2972 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
2973 build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
2977 /* not handled on fast-xmit */
2983 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
2986 /* We store the key here so there's no point in using rcu_dereference()
2987 * but that's fine because the code that changes the pointers will call
2988 * this function after doing so. For a single CPU that would be enough,
2989 * for multiple see the comment above.
2991 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
2993 build.key = rcu_access_pointer(sdata->default_unicast_key);
2995 bool gen_iv, iv_spc, mmic;
2997 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
2998 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
2999 mmic = build.key->conf.flags &
3000 (IEEE80211_KEY_FLAG_GENERATE_MMIC |
3001 IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
3003 /* don't handle software crypto */
3004 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
3007 /* Key is being removed */
3008 if (build.key->flags & KEY_FLAG_TAINTED)
3011 switch (build.key->conf.cipher) {
3012 case WLAN_CIPHER_SUITE_CCMP:
3013 case WLAN_CIPHER_SUITE_CCMP_256:
3015 build.pn_offs = build.hdr_len;
3016 if (gen_iv || iv_spc)
3017 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
3019 case WLAN_CIPHER_SUITE_GCMP:
3020 case WLAN_CIPHER_SUITE_GCMP_256:
3022 build.pn_offs = build.hdr_len;
3023 if (gen_iv || iv_spc)
3024 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
3026 case WLAN_CIPHER_SUITE_TKIP:
3027 /* cannot handle MMIC or IV generation in xmit-fast */
3031 build.hdr_len += IEEE80211_TKIP_IV_LEN;
3033 case WLAN_CIPHER_SUITE_WEP40:
3034 case WLAN_CIPHER_SUITE_WEP104:
3035 /* cannot handle IV generation in fast-xmit */
3039 build.hdr_len += IEEE80211_WEP_IV_LEN;
3041 case WLAN_CIPHER_SUITE_AES_CMAC:
3042 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
3043 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
3044 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
3046 "management cipher suite 0x%x enabled for data\n",
3047 build.key->conf.cipher);
3050 /* we don't know how to generate IVs for this at all */
3051 if (WARN_ON(gen_iv))
3053 /* pure hardware keys are OK, of course */
3054 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME))
3056 /* cipher scheme might require space allocation */
3058 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV)
3061 build.hdr_len += build.key->conf.iv_len;
3064 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
3067 hdr->frame_control = fc;
3069 memcpy(build.hdr + build.hdr_len,
3070 rfc1042_header, sizeof(rfc1042_header));
3071 build.hdr_len += sizeof(rfc1042_header);
3073 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
3074 /* if the kmemdup fails, continue w/o fast_tx */
3079 /* we might have raced against another call to this function */
3080 old = rcu_dereference_protected(sta->fast_tx,
3081 lockdep_is_held(&sta->lock));
3082 rcu_assign_pointer(sta->fast_tx, fast_tx);
3084 kfree_rcu(old, rcu_head);
3085 spin_unlock_bh(&sta->lock);
3088 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
3090 struct sta_info *sta;
3093 list_for_each_entry_rcu(sta, &local->sta_list, list)
3094 ieee80211_check_fast_xmit(sta);
3098 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
3100 struct ieee80211_local *local = sdata->local;
3101 struct sta_info *sta;
3105 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3106 if (sdata != sta->sdata &&
3107 (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
3109 ieee80211_check_fast_xmit(sta);
3115 void ieee80211_clear_fast_xmit(struct sta_info *sta)
3117 struct ieee80211_fast_tx *fast_tx;
3119 spin_lock_bh(&sta->lock);
3120 fast_tx = rcu_dereference_protected(sta->fast_tx,
3121 lockdep_is_held(&sta->lock));
3122 RCU_INIT_POINTER(sta->fast_tx, NULL);
3123 spin_unlock_bh(&sta->lock);
3126 kfree_rcu(fast_tx, rcu_head);
3129 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
3130 struct sk_buff *skb, int headroom)
3132 if (skb_headroom(skb) < headroom) {
3133 I802_DEBUG_INC(local->tx_expand_skb_head);
3135 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
3136 wiphy_debug(local->hw.wiphy,
3137 "failed to reallocate TX buffer\n");
3145 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
3146 struct ieee80211_fast_tx *fast_tx,
3147 struct sk_buff *skb)
3149 struct ieee80211_local *local = sdata->local;
3150 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3151 struct ieee80211_hdr *hdr;
3152 struct ethhdr *amsdu_hdr;
3153 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
3154 int subframe_len = skb->len - hdr_len;
3156 u8 *qc, *h_80211_src, *h_80211_dst;
3159 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
3162 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
3165 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr)))
3168 data = skb_push(skb, sizeof(*amsdu_hdr));
3169 memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
3171 amsdu_hdr = data + hdr_len;
3172 /* h_80211_src/dst is addr* field within hdr */
3173 h_80211_src = data + fast_tx->sa_offs;
3174 h_80211_dst = data + fast_tx->da_offs;
3176 amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
3177 ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
3178 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
3180 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
3181 * fields needs to be changed to BSSID for A-MSDU frames depending
3182 * on FromDS/ToDS values.
3184 switch (sdata->vif.type) {
3185 case NL80211_IFTYPE_STATION:
3186 bssid = sdata->u.mgd.bssid;
3188 case NL80211_IFTYPE_AP:
3189 case NL80211_IFTYPE_AP_VLAN:
3190 bssid = sdata->vif.addr;
3196 if (bssid && ieee80211_has_fromds(hdr->frame_control))
3197 ether_addr_copy(h_80211_src, bssid);
3199 if (bssid && ieee80211_has_tods(hdr->frame_control))
3200 ether_addr_copy(h_80211_dst, bssid);
3202 qc = ieee80211_get_qos_ctl(hdr);
3203 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
3205 info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
3210 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
3211 struct sta_info *sta,
3212 struct ieee80211_fast_tx *fast_tx,
3213 struct sk_buff *skb)
3215 struct ieee80211_local *local = sdata->local;
3216 struct fq *fq = &local->fq;
3218 struct fq_flow *flow;
3219 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3220 struct ieee80211_txq *txq = sta->sta.txq[tid];
3221 struct txq_info *txqi;
3222 struct sk_buff **frag_tail, *head;
3223 int subframe_len = skb->len - ETH_ALEN;
3224 u8 max_subframes = sta->sta.max_amsdu_subframes;
3225 int max_frags = local->hw.max_tx_fragments;
3226 int max_amsdu_len = sta->sta.max_amsdu_len;
3232 unsigned int orig_len;
3233 int n = 2, nfrags, pad = 0;
3236 if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
3239 if (skb_is_gso(skb))
3245 txqi = to_txq_info(txq);
3246 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
3249 if (sta->sta.max_rc_amsdu_len)
3250 max_amsdu_len = min_t(int, max_amsdu_len,
3251 sta->sta.max_rc_amsdu_len);
3253 if (sta->sta.max_tid_amsdu_len[tid])
3254 max_amsdu_len = min_t(int, max_amsdu_len,
3255 sta->sta.max_tid_amsdu_len[tid]);
3257 flow_idx = fq_flow_idx(fq, skb);
3259 spin_lock_bh(&fq->lock);
3261 /* TODO: Ideally aggregation should be done on dequeue to remain
3262 * responsive to environment changes.
3266 flow = fq_flow_classify(fq, tin, flow_idx, skb,
3267 fq_flow_get_default_func);
3268 head = skb_peek_tail(&flow->queue);
3269 if (!head || skb_is_gso(head))
3272 orig_truesize = head->truesize;
3273 orig_len = head->len;
3275 if (skb->len + head->len > max_amsdu_len)
3278 nfrags = 1 + skb_shinfo(skb)->nr_frags;
3279 nfrags += 1 + skb_shinfo(head)->nr_frags;
3280 frag_tail = &skb_shinfo(head)->frag_list;
3281 while (*frag_tail) {
3282 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
3283 frag_tail = &(*frag_tail)->next;
3287 if (max_subframes && n > max_subframes)
3290 if (max_frags && nfrags > max_frags)
3293 if (!drv_can_aggregate_in_amsdu(local, head, skb))
3296 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
3300 * Pad out the previous subframe to a multiple of 4 by adding the
3301 * padding to the next one, that's being added. Note that head->len
3302 * is the length of the full A-MSDU, but that works since each time
3303 * we add a new subframe we pad out the previous one to a multiple
3304 * of 4 and thus it no longer matters in the next round.
3306 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
3307 if ((head->len - hdrlen) & 3)
3308 pad = 4 - ((head->len - hdrlen) & 3);
3310 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
3315 data = skb_push(skb, ETH_ALEN + 2);
3316 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
3318 data += 2 * ETH_ALEN;
3319 len = cpu_to_be16(subframe_len);
3320 memcpy(data, &len, 2);
3321 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
3323 memset(skb_push(skb, pad), 0, pad);
3325 head->len += skb->len;
3326 head->data_len += skb->len;
3330 fq->memory_usage += head->truesize - orig_truesize;
3331 if (head->len != orig_len) {
3332 flow->backlog += head->len - orig_len;
3333 tin->backlog_bytes += head->len - orig_len;
3335 fq_recalc_backlog(fq, tin, flow);
3338 spin_unlock_bh(&fq->lock);
3344 * Can be called while the sta lock is held. Anything that can cause packets to
3345 * be generated will cause deadlock!
3347 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
3348 struct sta_info *sta, u8 pn_offs,
3349 struct ieee80211_key *key,
3350 struct sk_buff *skb)
3352 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
3353 struct ieee80211_hdr *hdr = (void *)skb->data;
3354 u8 tid = IEEE80211_NUM_TIDS;
3357 info->control.hw_key = &key->conf;
3359 ieee80211_tx_stats(skb->dev, skb->len);
3361 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3362 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3363 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
3365 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
3366 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
3367 sdata->sequence_number += 0x10;
3370 if (skb_shinfo(skb)->gso_size)
3371 sta->tx_stats.msdu[tid] +=
3372 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
3374 sta->tx_stats.msdu[tid]++;
3376 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
3378 /* statistics normally done by ieee80211_tx_h_stats (but that
3379 * has to consider fragmentation, so is more complex)
3381 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
3382 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
3386 u8 *crypto_hdr = skb->data + pn_offs;
3388 switch (key->conf.cipher) {
3389 case WLAN_CIPHER_SUITE_CCMP:
3390 case WLAN_CIPHER_SUITE_CCMP_256:
3391 case WLAN_CIPHER_SUITE_GCMP:
3392 case WLAN_CIPHER_SUITE_GCMP_256:
3393 pn = atomic64_inc_return(&key->conf.tx_pn);
3395 crypto_hdr[1] = pn >> 8;
3396 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6);
3397 crypto_hdr[4] = pn >> 16;
3398 crypto_hdr[5] = pn >> 24;
3399 crypto_hdr[6] = pn >> 32;
3400 crypto_hdr[7] = pn >> 40;
3406 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
3407 struct sta_info *sta,
3408 struct ieee80211_fast_tx *fast_tx,
3409 struct sk_buff *skb)
3411 struct ieee80211_local *local = sdata->local;
3412 u16 ethertype = (skb->data[12] << 8) | skb->data[13];
3413 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
3414 int hw_headroom = sdata->local->hw.extra_tx_headroom;
3416 struct ieee80211_tx_info *info;
3417 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
3418 struct ieee80211_tx_data tx;
3419 ieee80211_tx_result r;
3420 struct tid_ampdu_tx *tid_tx = NULL;
3421 u8 tid = IEEE80211_NUM_TIDS;
3423 /* control port protocol needs a lot of special handling */
3424 if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
3427 /* only RFC 1042 SNAP */
3428 if (ethertype < ETH_P_802_3_MIN)
3431 /* don't handle TX status request here either */
3432 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
3435 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3436 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3437 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
3439 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
3441 if (tid_tx->timeout)
3442 tid_tx->last_tx = jiffies;
3446 /* after this point (skb is modified) we cannot return false */
3448 if (skb_shared(skb)) {
3449 struct sk_buff *tmp_skb = skb;
3451 skb = skb_clone(skb, GFP_ATOMIC);
3458 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
3459 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
3462 /* will not be crypto-handled beyond what we do here, so use false
3463 * as the may-encrypt argument for the resize to not account for
3464 * more room than we already have in 'extra_head'
3466 if (unlikely(ieee80211_skb_resize(sdata, skb,
3467 max_t(int, extra_head + hw_headroom -
3468 skb_headroom(skb), 0),
3474 memcpy(ð, skb->data, ETH_HLEN - 2);
3475 hdr = skb_push(skb, extra_head);
3476 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
3477 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
3478 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
3480 info = IEEE80211_SKB_CB(skb);
3481 memset(info, 0, sizeof(*info));
3482 info->band = fast_tx->band;
3483 info->control.vif = &sdata->vif;
3484 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
3485 IEEE80211_TX_CTL_DONTFRAG |
3486 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
3487 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT;
3489 #ifdef CONFIG_MAC80211_DEBUGFS
3490 if (local->force_tx_status)
3491 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
3494 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
3495 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
3496 *ieee80211_get_qos_ctl(hdr) = tid;
3499 __skb_queue_head_init(&tx.skbs);
3501 tx.flags = IEEE80211_TX_UNICAST;
3505 tx.key = fast_tx->key;
3507 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
3509 r = ieee80211_tx_h_rate_ctrl(&tx);
3513 if (r != TX_CONTINUE) {
3520 if (ieee80211_queue_skb(local, sdata, sta, skb))
3523 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
3526 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3527 sdata = container_of(sdata->bss,
3528 struct ieee80211_sub_if_data, u.ap);
3530 __skb_queue_tail(&tx.skbs, skb);
3531 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false);
3535 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
3536 struct ieee80211_txq *txq)
3538 struct ieee80211_local *local = hw_to_local(hw);
3539 struct txq_info *txqi = container_of(txq, struct txq_info, txq);
3540 struct ieee80211_hdr *hdr;
3541 struct sk_buff *skb = NULL;
3542 struct fq *fq = &local->fq;
3543 struct fq_tin *tin = &txqi->tin;
3544 struct ieee80211_tx_info *info;
3545 struct ieee80211_tx_data tx;
3546 ieee80211_tx_result r;
3547 struct ieee80211_vif *vif = txq->vif;
3550 spin_lock_bh(&fq->lock);
3552 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ||
3553 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags))
3556 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) {
3557 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags);
3561 /* Make sure fragments stay together. */
3562 skb = __skb_dequeue(&txqi->frags);
3566 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
3570 spin_unlock_bh(&fq->lock);
3572 hdr = (struct ieee80211_hdr *)skb->data;
3573 info = IEEE80211_SKB_CB(skb);
3575 memset(&tx, 0, sizeof(tx));
3576 __skb_queue_head_init(&tx.skbs);
3579 tx.sdata = vif_to_sdata(info->control.vif);
3582 tx.sta = container_of(txq->sta, struct sta_info, sta);
3585 * The key can be removed while the packet was queued, so need to call
3586 * this here to get the current key.
3588 r = ieee80211_tx_h_select_key(&tx);
3589 if (r != TX_CONTINUE) {
3590 ieee80211_free_txskb(&local->hw, skb);
3594 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
3595 info->flags |= IEEE80211_TX_CTL_AMPDU;
3597 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
3599 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
3600 struct sta_info *sta = container_of(txq->sta, struct sta_info,
3605 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
3606 pn_offs = ieee80211_hdrlen(hdr->frame_control);
3608 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
3611 if (invoke_tx_handlers_late(&tx))
3614 skb = __skb_dequeue(&tx.skbs);
3616 if (!skb_queue_empty(&tx.skbs)) {
3617 spin_lock_bh(&fq->lock);
3618 skb_queue_splice_tail(&tx.skbs, &txqi->frags);
3619 spin_unlock_bh(&fq->lock);
3623 if (skb_has_frag_list(skb) &&
3624 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
3625 if (skb_linearize(skb)) {
3626 ieee80211_free_txskb(&local->hw, skb);
3631 switch (tx.sdata->vif.type) {
3632 case NL80211_IFTYPE_MONITOR:
3633 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
3634 vif = &tx.sdata->vif;
3637 tx.sdata = rcu_dereference(local->monitor_sdata);
3639 vif = &tx.sdata->vif;
3641 vif->hw_queue[skb_get_queue_mapping(skb)];
3642 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
3643 ieee80211_free_txskb(&local->hw, skb);
3649 case NL80211_IFTYPE_AP_VLAN:
3650 tx.sdata = container_of(tx.sdata->bss,
3651 struct ieee80211_sub_if_data, u.ap);
3654 vif = &tx.sdata->vif;
3658 IEEE80211_SKB_CB(skb)->control.vif = vif;
3662 spin_unlock_bh(&fq->lock);
3666 EXPORT_SYMBOL(ieee80211_tx_dequeue);
3668 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
3670 struct ieee80211_local *local = hw_to_local(hw);
3671 struct ieee80211_txq *ret = NULL;
3672 struct txq_info *txqi = NULL;
3674 spin_lock_bh(&local->active_txq_lock[ac]);
3677 txqi = list_first_entry_or_null(&local->active_txqs[ac],
3683 if (txqi->txq.sta) {
3684 struct sta_info *sta = container_of(txqi->txq.sta,
3685 struct sta_info, sta);
3687 if (sta->airtime[txqi->txq.ac].deficit < 0) {
3688 sta->airtime[txqi->txq.ac].deficit +=
3689 sta->airtime_weight;
3690 list_move_tail(&txqi->schedule_order,
3691 &local->active_txqs[txqi->txq.ac]);
3697 if (txqi->schedule_round == local->schedule_round[ac])
3700 list_del_init(&txqi->schedule_order);
3701 txqi->schedule_round = local->schedule_round[ac];
3705 spin_unlock_bh(&local->active_txq_lock[ac]);
3708 EXPORT_SYMBOL(ieee80211_next_txq);
3710 void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
3711 struct ieee80211_txq *txq,
3714 struct ieee80211_local *local = hw_to_local(hw);
3715 struct txq_info *txqi = to_txq_info(txq);
3717 spin_lock_bh(&local->active_txq_lock[txq->ac]);
3719 if (list_empty(&txqi->schedule_order) &&
3720 (force || !skb_queue_empty(&txqi->frags) ||
3721 txqi->tin.backlog_packets)) {
3722 /* If airtime accounting is active, always enqueue STAs at the
3723 * head of the list to ensure that they only get moved to the
3724 * back by the airtime DRR scheduler once they have a negative
3725 * deficit. A station that already has a negative deficit will
3726 * get immediately moved to the back of the list on the next
3727 * call to ieee80211_next_txq().
3729 if (txqi->txq.sta &&
3730 wiphy_ext_feature_isset(local->hw.wiphy,
3731 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
3732 list_add(&txqi->schedule_order,
3733 &local->active_txqs[txq->ac]);
3735 list_add_tail(&txqi->schedule_order,
3736 &local->active_txqs[txq->ac]);
3739 spin_unlock_bh(&local->active_txq_lock[txq->ac]);
3741 EXPORT_SYMBOL(__ieee80211_schedule_txq);
3743 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw,
3744 struct ieee80211_txq *txq)
3746 struct ieee80211_local *local = hw_to_local(hw);
3747 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq);
3748 struct sta_info *sta;
3751 spin_lock_bh(&local->active_txq_lock[ac]);
3756 if (list_empty(&txqi->schedule_order))
3759 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac],
3764 if (!iter->txq.sta) {
3765 list_move_tail(&iter->schedule_order,
3766 &local->active_txqs[ac]);
3769 sta = container_of(iter->txq.sta, struct sta_info, sta);
3770 if (sta->airtime[ac].deficit < 0)
3771 sta->airtime[ac].deficit += sta->airtime_weight;
3772 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]);
3775 sta = container_of(txqi->txq.sta, struct sta_info, sta);
3776 if (sta->airtime[ac].deficit >= 0)
3779 sta->airtime[ac].deficit += sta->airtime_weight;
3780 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]);
3781 spin_unlock_bh(&local->active_txq_lock[ac]);
3785 if (!list_empty(&txqi->schedule_order))
3786 list_del_init(&txqi->schedule_order);
3787 spin_unlock_bh(&local->active_txq_lock[ac]);
3791 EXPORT_SYMBOL(ieee80211_txq_may_transmit);
3793 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac)
3795 struct ieee80211_local *local = hw_to_local(hw);
3797 spin_lock_bh(&local->active_txq_lock[ac]);
3798 local->schedule_round[ac]++;
3799 spin_unlock_bh(&local->active_txq_lock[ac]);
3801 EXPORT_SYMBOL(ieee80211_txq_schedule_start);
3803 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
3804 struct net_device *dev,
3808 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3809 struct ieee80211_local *local = sdata->local;
3810 struct sta_info *sta;
3811 struct sk_buff *next;
3813 if (unlikely(skb->len < ETH_HLEN)) {
3820 if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
3826 if (local->ops->wake_tx_queue) {
3827 u16 queue = __ieee80211_select_queue(sdata, sta, skb);
3828 skb_set_queue_mapping(skb, queue);
3832 struct ieee80211_fast_tx *fast_tx;
3834 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
3836 fast_tx = rcu_dereference(sta->fast_tx);
3839 ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
3843 if (skb_is_gso(skb)) {
3844 struct sk_buff *segs;
3846 segs = skb_gso_segment(skb, 0);
3854 /* we cannot process non-linear frames on this path */
3855 if (skb_linearize(skb)) {
3860 /* the frame could be fragmented, software-encrypted, and other
3861 * things so we cannot really handle checksum offload with it -
3862 * fix it up in software before we handle anything else.
3864 if (skb->ip_summed == CHECKSUM_PARTIAL) {
3865 skb_set_transport_header(skb,
3866 skb_checksum_start_offset(skb));
3867 if (skb_checksum_help(skb))
3880 skb = ieee80211_build_hdr(sdata, skb, info_flags,
3885 ieee80211_tx_stats(dev, skb->len);
3887 ieee80211_xmit(sdata, sta, skb, 0);
3896 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
3901 err = skb_ensure_writable(skb, ETH_HLEN);
3905 eth = (void *)skb->data;
3906 ether_addr_copy(eth->h_dest, sta->sta.addr);
3911 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
3912 struct net_device *dev)
3914 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3915 const struct ethhdr *eth = (void *)skb->data;
3916 const struct vlan_ethhdr *ethvlan = (void *)skb->data;
3919 if (likely(!is_multicast_ether_addr(eth->h_dest)))
3922 switch (sdata->vif.type) {
3923 case NL80211_IFTYPE_AP_VLAN:
3924 if (sdata->u.vlan.sta)
3926 if (sdata->wdev.use_4addr)
3929 case NL80211_IFTYPE_AP:
3930 /* check runtime toggle for this bss */
3931 if (!sdata->bss->multicast_to_unicast)
3938 /* multicast to unicast conversion only for some payload */
3939 ethertype = eth->h_proto;
3940 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
3941 ethertype = ethvlan->h_vlan_encapsulated_proto;
3942 switch (ethertype) {
3943 case htons(ETH_P_ARP):
3944 case htons(ETH_P_IP):
3945 case htons(ETH_P_IPV6):
3955 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
3956 struct sk_buff_head *queue)
3958 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
3959 struct ieee80211_local *local = sdata->local;
3960 const struct ethhdr *eth = (struct ethhdr *)skb->data;
3961 struct sta_info *sta, *first = NULL;
3962 struct sk_buff *cloned_skb;
3966 list_for_each_entry_rcu(sta, &local->sta_list, list) {
3967 if (sdata != sta->sdata)
3968 /* AP-VLAN mismatch */
3970 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
3971 /* do not send back to source */
3977 cloned_skb = skb_clone(skb, GFP_ATOMIC);
3980 if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
3981 dev_kfree_skb(cloned_skb);
3984 __skb_queue_tail(queue, cloned_skb);
3987 if (likely(first)) {
3988 if (unlikely(ieee80211_change_da(skb, first)))
3990 __skb_queue_tail(queue, skb);
3992 /* no STA connected, drop */
3999 __skb_queue_purge(queue);
4000 __skb_queue_tail(queue, skb);
4006 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
4007 * @skb: packet to be sent
4008 * @dev: incoming interface
4010 * On failure skb will be freed.
4012 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
4013 struct net_device *dev)
4015 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
4016 struct sk_buff_head queue;
4018 __skb_queue_head_init(&queue);
4019 ieee80211_convert_to_unicast(skb, dev, &queue);
4020 while ((skb = __skb_dequeue(&queue)))
4021 __ieee80211_subif_start_xmit(skb, dev, 0, 0);
4023 __ieee80211_subif_start_xmit(skb, dev, 0, 0);
4026 return NETDEV_TX_OK;
4030 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
4031 struct sk_buff *skb, u32 info_flags)
4033 struct ieee80211_hdr *hdr;
4034 struct ieee80211_tx_data tx = {
4035 .local = sdata->local,
4038 struct sta_info *sta;
4042 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
4044 skb = ERR_PTR(-EINVAL);
4048 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0);
4052 hdr = (void *)skb->data;
4053 tx.sta = sta_info_get(sdata, hdr->addr1);
4056 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
4059 return ERR_PTR(-EINVAL);
4068 * ieee80211_clear_tx_pending may not be called in a context where
4069 * it is possible that it packets could come in again.
4071 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
4073 struct sk_buff *skb;
4076 for (i = 0; i < local->hw.queues; i++) {
4077 while ((skb = skb_dequeue(&local->pending[i])) != NULL)
4078 ieee80211_free_txskb(&local->hw, skb);
4083 * Returns false if the frame couldn't be transmitted but was queued instead,
4084 * which in this case means re-queued -- take as an indication to stop sending
4085 * more pending frames.
4087 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
4088 struct sk_buff *skb)
4090 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4091 struct ieee80211_sub_if_data *sdata;
4092 struct sta_info *sta;
4093 struct ieee80211_hdr *hdr;
4095 struct ieee80211_chanctx_conf *chanctx_conf;
4097 sdata = vif_to_sdata(info->control.vif);
4099 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
4100 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4101 if (unlikely(!chanctx_conf)) {
4105 info->band = chanctx_conf->def.chan->band;
4106 result = ieee80211_tx(sdata, NULL, skb, true, 0);
4108 struct sk_buff_head skbs;
4110 __skb_queue_head_init(&skbs);
4111 __skb_queue_tail(&skbs, skb);
4113 hdr = (struct ieee80211_hdr *)skb->data;
4114 sta = sta_info_get(sdata, hdr->addr1);
4116 result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
4123 * Transmit all pending packets. Called from tasklet.
4125 void ieee80211_tx_pending(unsigned long data)
4127 struct ieee80211_local *local = (struct ieee80211_local *)data;
4128 unsigned long flags;
4134 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
4135 for (i = 0; i < local->hw.queues; i++) {
4137 * If queue is stopped by something other than due to pending
4138 * frames, or we have no pending frames, proceed to next queue.
4140 if (local->queue_stop_reasons[i] ||
4141 skb_queue_empty(&local->pending[i]))
4144 while (!skb_queue_empty(&local->pending[i])) {
4145 struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
4146 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
4148 if (WARN_ON(!info->control.vif)) {
4149 ieee80211_free_txskb(&local->hw, skb);
4153 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
4156 txok = ieee80211_tx_pending_skb(local, skb);
4157 spin_lock_irqsave(&local->queue_stop_reason_lock,
4163 if (skb_queue_empty(&local->pending[i]))
4164 ieee80211_propagate_queue_wake(local, i);
4166 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
4171 /* functions for drivers to get certain frames */
4173 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4174 struct ps_data *ps, struct sk_buff *skb,
4179 int i, have_bits = 0, n1, n2;
4181 /* Generate bitmap for TIM only if there are any STAs in power save
4183 if (atomic_read(&ps->num_sta_ps) > 0)
4184 /* in the hope that this is faster than
4185 * checking byte-for-byte */
4186 have_bits = !bitmap_empty((unsigned long *)ps->tim,
4187 IEEE80211_MAX_AID+1);
4189 if (ps->dtim_count == 0)
4190 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
4195 tim = pos = skb_put(skb, 6);
4196 *pos++ = WLAN_EID_TIM;
4198 *pos++ = ps->dtim_count;
4199 *pos++ = sdata->vif.bss_conf.dtim_period;
4201 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
4204 ps->dtim_bc_mc = aid0 == 1;
4207 /* Find largest even number N1 so that bits numbered 1 through
4208 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
4209 * (N2 + 1) x 8 through 2007 are 0. */
4211 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
4218 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
4225 /* Bitmap control */
4227 /* Part Virt Bitmap */
4228 skb_put(skb, n2 - n1);
4229 memcpy(pos, ps->tim + n1, n2 - n1 + 1);
4231 tim[1] = n2 - n1 + 4;
4233 *pos++ = aid0; /* Bitmap control */
4234 *pos++ = 0; /* Part Virt Bitmap */
4238 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
4239 struct ps_data *ps, struct sk_buff *skb,
4242 struct ieee80211_local *local = sdata->local;
4245 * Not very nice, but we want to allow the driver to call
4246 * ieee80211_beacon_get() as a response to the set_tim()
4247 * callback. That, however, is already invoked under the
4248 * sta_lock to guarantee consistent and race-free update
4249 * of the tim bitmap in mac80211 and the driver.
4251 if (local->tim_in_locked_section) {
4252 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4254 spin_lock_bh(&local->tim_lock);
4255 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template);
4256 spin_unlock_bh(&local->tim_lock);
4262 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
4263 struct beacon_data *beacon)
4265 struct probe_resp *resp;
4267 size_t beacon_data_len;
4269 u8 count = beacon->csa_current_counter;
4271 switch (sdata->vif.type) {
4272 case NL80211_IFTYPE_AP:
4273 beacon_data = beacon->tail;
4274 beacon_data_len = beacon->tail_len;
4276 case NL80211_IFTYPE_ADHOC:
4277 beacon_data = beacon->head;
4278 beacon_data_len = beacon->head_len;
4280 case NL80211_IFTYPE_MESH_POINT:
4281 beacon_data = beacon->head;
4282 beacon_data_len = beacon->head_len;
4289 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) {
4290 resp = rcu_dereference(sdata->u.ap.probe_resp);
4292 if (beacon->csa_counter_offsets[i]) {
4293 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >=
4299 beacon_data[beacon->csa_counter_offsets[i]] = count;
4302 if (sdata->vif.type == NL80211_IFTYPE_AP && resp)
4303 resp->data[resp->csa_counter_offsets[i]] = count;
4308 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
4310 beacon->csa_current_counter--;
4312 /* the counter should never reach 0 */
4313 WARN_ON_ONCE(!beacon->csa_current_counter);
4315 return beacon->csa_current_counter;
4318 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
4320 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4321 struct beacon_data *beacon = NULL;
4326 if (sdata->vif.type == NL80211_IFTYPE_AP)
4327 beacon = rcu_dereference(sdata->u.ap.beacon);
4328 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4329 beacon = rcu_dereference(sdata->u.ibss.presp);
4330 else if (ieee80211_vif_is_mesh(&sdata->vif))
4331 beacon = rcu_dereference(sdata->u.mesh.beacon);
4336 count = __ieee80211_csa_update_counter(beacon);
4342 EXPORT_SYMBOL(ieee80211_csa_update_counter);
4344 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter)
4346 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4347 struct beacon_data *beacon = NULL;
4351 if (sdata->vif.type == NL80211_IFTYPE_AP)
4352 beacon = rcu_dereference(sdata->u.ap.beacon);
4353 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
4354 beacon = rcu_dereference(sdata->u.ibss.presp);
4355 else if (ieee80211_vif_is_mesh(&sdata->vif))
4356 beacon = rcu_dereference(sdata->u.mesh.beacon);
4361 if (counter < beacon->csa_current_counter)
4362 beacon->csa_current_counter = counter;
4367 EXPORT_SYMBOL(ieee80211_csa_set_counter);
4369 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
4371 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4372 struct beacon_data *beacon = NULL;
4374 size_t beacon_data_len;
4377 if (!ieee80211_sdata_running(sdata))
4381 if (vif->type == NL80211_IFTYPE_AP) {
4382 struct ieee80211_if_ap *ap = &sdata->u.ap;
4384 beacon = rcu_dereference(ap->beacon);
4385 if (WARN_ON(!beacon || !beacon->tail))
4387 beacon_data = beacon->tail;
4388 beacon_data_len = beacon->tail_len;
4389 } else if (vif->type == NL80211_IFTYPE_ADHOC) {
4390 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4392 beacon = rcu_dereference(ifibss->presp);
4396 beacon_data = beacon->head;
4397 beacon_data_len = beacon->head_len;
4398 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
4399 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4401 beacon = rcu_dereference(ifmsh->beacon);
4405 beacon_data = beacon->head;
4406 beacon_data_len = beacon->head_len;
4412 if (!beacon->csa_counter_offsets[0])
4415 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len))
4418 if (beacon_data[beacon->csa_counter_offsets[0]] == 1)
4425 EXPORT_SYMBOL(ieee80211_csa_is_complete);
4427 static struct sk_buff *
4428 __ieee80211_beacon_get(struct ieee80211_hw *hw,
4429 struct ieee80211_vif *vif,
4430 struct ieee80211_mutable_offsets *offs,
4433 struct ieee80211_local *local = hw_to_local(hw);
4434 struct beacon_data *beacon = NULL;
4435 struct sk_buff *skb = NULL;
4436 struct ieee80211_tx_info *info;
4437 struct ieee80211_sub_if_data *sdata = NULL;
4438 enum nl80211_band band;
4439 struct ieee80211_tx_rate_control txrc;
4440 struct ieee80211_chanctx_conf *chanctx_conf;
4441 int csa_off_base = 0;
4445 sdata = vif_to_sdata(vif);
4446 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4448 if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
4452 memset(offs, 0, sizeof(*offs));
4454 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4455 struct ieee80211_if_ap *ap = &sdata->u.ap;
4457 beacon = rcu_dereference(ap->beacon);
4459 if (beacon->csa_counter_offsets[0]) {
4461 __ieee80211_csa_update_counter(beacon);
4463 ieee80211_set_csa(sdata, beacon);
4467 * headroom, head length,
4468 * tail length and maximum TIM length
4470 skb = dev_alloc_skb(local->tx_headroom +
4472 beacon->tail_len + 256 +
4473 local->hw.extra_beacon_tailroom);
4477 skb_reserve(skb, local->tx_headroom);
4478 skb_put_data(skb, beacon->head, beacon->head_len);
4480 ieee80211_beacon_add_tim(sdata, &ap->ps, skb,
4484 offs->tim_offset = beacon->head_len;
4485 offs->tim_length = skb->len - beacon->head_len;
4487 /* for AP the csa offsets are from tail */
4488 csa_off_base = skb->len;
4492 skb_put_data(skb, beacon->tail,
4496 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
4497 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
4498 struct ieee80211_hdr *hdr;
4500 beacon = rcu_dereference(ifibss->presp);
4504 if (beacon->csa_counter_offsets[0]) {
4506 __ieee80211_csa_update_counter(beacon);
4508 ieee80211_set_csa(sdata, beacon);
4511 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
4512 local->hw.extra_beacon_tailroom);
4515 skb_reserve(skb, local->tx_headroom);
4516 skb_put_data(skb, beacon->head, beacon->head_len);
4518 hdr = (struct ieee80211_hdr *) skb->data;
4519 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4520 IEEE80211_STYPE_BEACON);
4521 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4522 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
4524 beacon = rcu_dereference(ifmsh->beacon);
4528 if (beacon->csa_counter_offsets[0]) {
4530 /* TODO: For mesh csa_counter is in TU, so
4531 * decrementing it by one isn't correct, but
4532 * for now we leave it consistent with overall
4533 * mac80211's behavior.
4535 __ieee80211_csa_update_counter(beacon);
4537 ieee80211_set_csa(sdata, beacon);
4540 if (ifmsh->sync_ops)
4541 ifmsh->sync_ops->adjust_tsf(sdata, beacon);
4543 skb = dev_alloc_skb(local->tx_headroom +
4547 local->hw.extra_beacon_tailroom);
4550 skb_reserve(skb, local->tx_headroom);
4551 skb_put_data(skb, beacon->head, beacon->head_len);
4552 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template);
4555 offs->tim_offset = beacon->head_len;
4556 offs->tim_length = skb->len - beacon->head_len;
4559 skb_put_data(skb, beacon->tail, beacon->tail_len);
4566 if (offs && beacon) {
4569 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) {
4570 u16 csa_off = beacon->csa_counter_offsets[i];
4575 offs->csa_counter_offs[i] = csa_off_base + csa_off;
4579 band = chanctx_conf->def.chan->band;
4581 info = IEEE80211_SKB_CB(skb);
4583 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
4584 info->flags |= IEEE80211_TX_CTL_NO_ACK;
4587 memset(&txrc, 0, sizeof(txrc));
4589 txrc.sband = local->hw.wiphy->bands[band];
4590 txrc.bss_conf = &sdata->vif.bss_conf;
4592 txrc.reported_rate.idx = -1;
4593 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
4595 rate_control_get_rate(sdata, NULL, &txrc);
4597 info->control.vif = vif;
4599 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
4600 IEEE80211_TX_CTL_ASSIGN_SEQ |
4601 IEEE80211_TX_CTL_FIRST_FRAGMENT;
4609 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
4610 struct ieee80211_vif *vif,
4611 struct ieee80211_mutable_offsets *offs)
4613 return __ieee80211_beacon_get(hw, vif, offs, true);
4615 EXPORT_SYMBOL(ieee80211_beacon_get_template);
4617 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
4618 struct ieee80211_vif *vif,
4619 u16 *tim_offset, u16 *tim_length)
4621 struct ieee80211_mutable_offsets offs = {};
4622 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false);
4623 struct sk_buff *copy;
4624 struct ieee80211_supported_band *sband;
4631 *tim_offset = offs.tim_offset;
4634 *tim_length = offs.tim_length;
4636 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
4637 !hw_to_local(hw)->monitors)
4640 /* send a copy to monitor interfaces */
4641 copy = skb_copy(bcn, GFP_ATOMIC);
4645 shift = ieee80211_vif_get_shift(vif);
4646 sband = ieee80211_get_sband(vif_to_sdata(vif));
4650 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false);
4654 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
4656 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
4657 struct ieee80211_vif *vif)
4659 struct ieee80211_if_ap *ap = NULL;
4660 struct sk_buff *skb = NULL;
4661 struct probe_resp *presp = NULL;
4662 struct ieee80211_hdr *hdr;
4663 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
4665 if (sdata->vif.type != NL80211_IFTYPE_AP)
4671 presp = rcu_dereference(ap->probe_resp);
4675 skb = dev_alloc_skb(presp->len);
4679 skb_put_data(skb, presp->data, presp->len);
4681 hdr = (struct ieee80211_hdr *) skb->data;
4682 memset(hdr->addr1, 0, sizeof(hdr->addr1));
4688 EXPORT_SYMBOL(ieee80211_proberesp_get);
4690 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
4691 struct ieee80211_vif *vif)
4693 struct ieee80211_sub_if_data *sdata;
4694 struct ieee80211_if_managed *ifmgd;
4695 struct ieee80211_pspoll *pspoll;
4696 struct ieee80211_local *local;
4697 struct sk_buff *skb;
4699 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4702 sdata = vif_to_sdata(vif);
4703 ifmgd = &sdata->u.mgd;
4704 local = sdata->local;
4706 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
4710 skb_reserve(skb, local->hw.extra_tx_headroom);
4712 pspoll = skb_put_zero(skb, sizeof(*pspoll));
4713 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
4714 IEEE80211_STYPE_PSPOLL);
4715 pspoll->aid = cpu_to_le16(ifmgd->aid);
4717 /* aid in PS-Poll has its two MSBs each set to 1 */
4718 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
4720 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
4721 memcpy(pspoll->ta, vif->addr, ETH_ALEN);
4725 EXPORT_SYMBOL(ieee80211_pspoll_get);
4727 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
4728 struct ieee80211_vif *vif,
4731 struct ieee80211_hdr_3addr *nullfunc;
4732 struct ieee80211_sub_if_data *sdata;
4733 struct ieee80211_if_managed *ifmgd;
4734 struct ieee80211_local *local;
4735 struct sk_buff *skb;
4738 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
4741 sdata = vif_to_sdata(vif);
4742 ifmgd = &sdata->u.mgd;
4743 local = sdata->local;
4746 struct sta_info *sta;
4749 sta = sta_info_get(sdata, ifmgd->bssid);
4750 qos = sta && sta->sta.wme;
4754 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
4755 sizeof(*nullfunc) + 2);
4759 skb_reserve(skb, local->hw.extra_tx_headroom);
4761 nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
4762 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
4763 IEEE80211_STYPE_NULLFUNC |
4764 IEEE80211_FCTL_TODS);
4766 __le16 qoshdr = cpu_to_le16(7);
4768 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
4769 IEEE80211_STYPE_NULLFUNC) !=
4770 IEEE80211_STYPE_QOS_NULLFUNC);
4771 nullfunc->frame_control |=
4772 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
4774 skb_set_queue_mapping(skb, IEEE80211_AC_VO);
4775 skb_put_data(skb, &qoshdr, sizeof(qoshdr));
4778 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
4779 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
4780 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
4784 EXPORT_SYMBOL(ieee80211_nullfunc_get);
4786 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
4788 const u8 *ssid, size_t ssid_len,
4791 struct ieee80211_local *local = hw_to_local(hw);
4792 struct ieee80211_hdr_3addr *hdr;
4793 struct sk_buff *skb;
4797 ie_ssid_len = 2 + ssid_len;
4799 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
4800 ie_ssid_len + tailroom);
4804 skb_reserve(skb, local->hw.extra_tx_headroom);
4806 hdr = skb_put_zero(skb, sizeof(*hdr));
4807 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
4808 IEEE80211_STYPE_PROBE_REQ);
4809 eth_broadcast_addr(hdr->addr1);
4810 memcpy(hdr->addr2, src_addr, ETH_ALEN);
4811 eth_broadcast_addr(hdr->addr3);
4813 pos = skb_put(skb, ie_ssid_len);
4814 *pos++ = WLAN_EID_SSID;
4817 memcpy(pos, ssid, ssid_len);
4822 EXPORT_SYMBOL(ieee80211_probereq_get);
4824 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4825 const void *frame, size_t frame_len,
4826 const struct ieee80211_tx_info *frame_txctl,
4827 struct ieee80211_rts *rts)
4829 const struct ieee80211_hdr *hdr = frame;
4831 rts->frame_control =
4832 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
4833 rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
4835 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
4836 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
4838 EXPORT_SYMBOL(ieee80211_rts_get);
4840 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
4841 const void *frame, size_t frame_len,
4842 const struct ieee80211_tx_info *frame_txctl,
4843 struct ieee80211_cts *cts)
4845 const struct ieee80211_hdr *hdr = frame;
4847 cts->frame_control =
4848 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
4849 cts->duration = ieee80211_ctstoself_duration(hw, vif,
4850 frame_len, frame_txctl);
4851 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
4853 EXPORT_SYMBOL(ieee80211_ctstoself_get);
4856 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
4857 struct ieee80211_vif *vif)
4859 struct ieee80211_local *local = hw_to_local(hw);
4860 struct sk_buff *skb = NULL;
4861 struct ieee80211_tx_data tx;
4862 struct ieee80211_sub_if_data *sdata;
4864 struct ieee80211_tx_info *info;
4865 struct ieee80211_chanctx_conf *chanctx_conf;
4867 sdata = vif_to_sdata(vif);
4870 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
4875 if (sdata->vif.type == NL80211_IFTYPE_AP) {
4876 struct beacon_data *beacon =
4877 rcu_dereference(sdata->u.ap.beacon);
4879 if (!beacon || !beacon->head)
4882 ps = &sdata->u.ap.ps;
4883 } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
4884 ps = &sdata->u.mesh.ps;
4889 if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
4890 goto out; /* send buffered bc/mc only after DTIM beacon */
4893 skb = skb_dequeue(&ps->bc_buf);
4896 local->total_ps_buffered--;
4898 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
4899 struct ieee80211_hdr *hdr =
4900 (struct ieee80211_hdr *) skb->data;
4901 /* more buffered multicast/broadcast frames ==> set
4902 * MoreData flag in IEEE 802.11 header to inform PS
4904 hdr->frame_control |=
4905 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
4908 if (sdata->vif.type == NL80211_IFTYPE_AP)
4909 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
4910 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
4912 ieee80211_free_txskb(hw, skb);
4915 info = IEEE80211_SKB_CB(skb);
4917 tx.flags |= IEEE80211_TX_PS_BUFFERED;
4918 info->band = chanctx_conf->def.chan->band;
4920 if (invoke_tx_handlers(&tx))
4927 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
4929 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4931 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4932 struct ieee80211_sub_if_data *sdata = sta->sdata;
4933 struct ieee80211_local *local = sdata->local;
4937 lockdep_assert_held(&local->sta_mtx);
4939 /* only some cases are supported right now */
4940 switch (sdata->vif.type) {
4941 case NL80211_IFTYPE_STATION:
4942 case NL80211_IFTYPE_AP:
4943 case NL80211_IFTYPE_AP_VLAN:
4950 if (WARN_ON(tid >= IEEE80211_NUM_UPS))
4953 if (sta->reserved_tid == tid) {
4958 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
4959 sdata_err(sdata, "TID reservation already active\n");
4964 ieee80211_stop_vif_queues(sdata->local, sdata,
4965 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4969 /* Tear down BA sessions so we stop aggregating on this TID */
4970 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
4971 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
4972 __ieee80211_stop_tx_ba_session(sta, tid,
4973 AGG_STOP_LOCAL_REQUEST);
4976 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
4977 __ieee80211_flush_queues(local, sdata, queues, false);
4979 sta->reserved_tid = tid;
4981 ieee80211_wake_vif_queues(local, sdata,
4982 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
4984 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
4985 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
4991 EXPORT_SYMBOL(ieee80211_reserve_tid);
4993 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
4995 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
4996 struct ieee80211_sub_if_data *sdata = sta->sdata;
4998 lockdep_assert_held(&sdata->local->sta_mtx);
5000 /* only some cases are supported right now */
5001 switch (sdata->vif.type) {
5002 case NL80211_IFTYPE_STATION:
5003 case NL80211_IFTYPE_AP:
5004 case NL80211_IFTYPE_AP_VLAN:
5011 if (tid != sta->reserved_tid) {
5012 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
5016 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
5018 EXPORT_SYMBOL(ieee80211_unreserve_tid);
5020 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
5021 struct sk_buff *skb, int tid,
5022 enum nl80211_band band, u32 txdata_flags)
5024 int ac = ieee80211_ac_from_tid(tid);
5026 skb_reset_mac_header(skb);
5027 skb_set_queue_mapping(skb, ac);
5028 skb->priority = tid;
5030 skb->dev = sdata->dev;
5033 * The other path calling ieee80211_xmit is from the tasklet,
5034 * and while we can handle concurrent transmissions locking
5035 * requirements are that we do not come into tx with bhs on.
5038 IEEE80211_SKB_CB(skb)->band = band;
5039 ieee80211_xmit(sdata, NULL, skb, txdata_flags);
5043 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
5044 const u8 *buf, size_t len,
5045 const u8 *dest, __be16 proto, bool unencrypted)
5047 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5048 struct ieee80211_local *local = sdata->local;
5049 struct sk_buff *skb;
5050 struct ethhdr *ehdr;
5053 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
5054 * or Pre-Authentication
5056 if (proto != sdata->control_port_protocol &&
5057 proto != cpu_to_be16(ETH_P_PREAUTH))
5061 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT;
5065 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
5066 sizeof(struct ethhdr) + len);
5070 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
5072 skb_put_data(skb, buf, len);
5074 ehdr = skb_push(skb, sizeof(struct ethhdr));
5075 memcpy(ehdr->h_dest, dest, ETH_ALEN);
5076 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
5077 ehdr->h_proto = proto;
5080 skb->protocol = htons(ETH_P_802_3);
5081 skb_reset_network_header(skb);
5082 skb_reset_mac_header(skb);
5085 __ieee80211_subif_start_xmit(skb, skb->dev, flags, 0);
5091 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev,
5092 const u8 *buf, size_t len)
5094 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
5095 struct ieee80211_local *local = sdata->local;
5096 struct sk_buff *skb;
5098 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len +
5099 30 + /* header size */
5100 18); /* 11s header size */
5104 skb_reserve(skb, local->hw.extra_tx_headroom);
5105 skb_put_data(skb, buf, len);
5108 skb->protocol = htons(ETH_P_802_3);
5109 skb_reset_network_header(skb);
5110 skb_reset_mac_header(skb);
5113 __ieee80211_subif_start_xmit(skb, skb->dev, 0,
5114 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP);